sock.c revision ec98c6b9b47df6df1c1fa6cf3d427414f8c2cf16
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 = sock_net(sk); 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 if (optname == SO_BINDTODEVICE) 454 return sock_bindtodevice(sk, optval, optlen); 455 456 if (optlen < sizeof(int)) 457 return -EINVAL; 458 459 if (get_user(val, (int __user *)optval)) 460 return -EFAULT; 461 462 valbool = val?1:0; 463 464 lock_sock(sk); 465 466 switch(optname) { 467 case SO_DEBUG: 468 if (val && !capable(CAP_NET_ADMIN)) { 469 ret = -EACCES; 470 } else 471 sock_valbool_flag(sk, SOCK_DBG, valbool); 472 break; 473 case SO_REUSEADDR: 474 sk->sk_reuse = valbool; 475 break; 476 case SO_TYPE: 477 case SO_ERROR: 478 ret = -ENOPROTOOPT; 479 break; 480 case SO_DONTROUTE: 481 sock_valbool_flag(sk, SOCK_LOCALROUTE, valbool); 482 break; 483 case SO_BROADCAST: 484 sock_valbool_flag(sk, SOCK_BROADCAST, valbool); 485 break; 486 case SO_SNDBUF: 487 /* Don't error on this BSD doesn't and if you think 488 about it this is right. Otherwise apps have to 489 play 'guess the biggest size' games. RCVBUF/SNDBUF 490 are treated in BSD as hints */ 491 492 if (val > sysctl_wmem_max) 493 val = sysctl_wmem_max; 494set_sndbuf: 495 sk->sk_userlocks |= SOCK_SNDBUF_LOCK; 496 if ((val * 2) < SOCK_MIN_SNDBUF) 497 sk->sk_sndbuf = SOCK_MIN_SNDBUF; 498 else 499 sk->sk_sndbuf = val * 2; 500 501 /* 502 * Wake up sending tasks if we 503 * upped the value. 504 */ 505 sk->sk_write_space(sk); 506 break; 507 508 case SO_SNDBUFFORCE: 509 if (!capable(CAP_NET_ADMIN)) { 510 ret = -EPERM; 511 break; 512 } 513 goto set_sndbuf; 514 515 case SO_RCVBUF: 516 /* Don't error on this BSD doesn't and if you think 517 about it this is right. Otherwise apps have to 518 play 'guess the biggest size' games. RCVBUF/SNDBUF 519 are treated in BSD as hints */ 520 521 if (val > sysctl_rmem_max) 522 val = sysctl_rmem_max; 523set_rcvbuf: 524 sk->sk_userlocks |= SOCK_RCVBUF_LOCK; 525 /* 526 * We double it on the way in to account for 527 * "struct sk_buff" etc. overhead. Applications 528 * assume that the SO_RCVBUF setting they make will 529 * allow that much actual data to be received on that 530 * socket. 531 * 532 * Applications are unaware that "struct sk_buff" and 533 * other overheads allocate from the receive buffer 534 * during socket buffer allocation. 535 * 536 * And after considering the possible alternatives, 537 * returning the value we actually used in getsockopt 538 * is the most desirable behavior. 539 */ 540 if ((val * 2) < SOCK_MIN_RCVBUF) 541 sk->sk_rcvbuf = SOCK_MIN_RCVBUF; 542 else 543 sk->sk_rcvbuf = val * 2; 544 break; 545 546 case SO_RCVBUFFORCE: 547 if (!capable(CAP_NET_ADMIN)) { 548 ret = -EPERM; 549 break; 550 } 551 goto set_rcvbuf; 552 553 case SO_KEEPALIVE: 554#ifdef CONFIG_INET 555 if (sk->sk_protocol == IPPROTO_TCP) 556 tcp_set_keepalive(sk, valbool); 557#endif 558 sock_valbool_flag(sk, SOCK_KEEPOPEN, valbool); 559 break; 560 561 case SO_OOBINLINE: 562 sock_valbool_flag(sk, SOCK_URGINLINE, valbool); 563 break; 564 565 case SO_NO_CHECK: 566 sk->sk_no_check = valbool; 567 break; 568 569 case SO_PRIORITY: 570 if ((val >= 0 && val <= 6) || capable(CAP_NET_ADMIN)) 571 sk->sk_priority = val; 572 else 573 ret = -EPERM; 574 break; 575 576 case SO_LINGER: 577 if (optlen < sizeof(ling)) { 578 ret = -EINVAL; /* 1003.1g */ 579 break; 580 } 581 if (copy_from_user(&ling,optval,sizeof(ling))) { 582 ret = -EFAULT; 583 break; 584 } 585 if (!ling.l_onoff) 586 sock_reset_flag(sk, SOCK_LINGER); 587 else { 588#if (BITS_PER_LONG == 32) 589 if ((unsigned int)ling.l_linger >= MAX_SCHEDULE_TIMEOUT/HZ) 590 sk->sk_lingertime = MAX_SCHEDULE_TIMEOUT; 591 else 592#endif 593 sk->sk_lingertime = (unsigned int)ling.l_linger * HZ; 594 sock_set_flag(sk, SOCK_LINGER); 595 } 596 break; 597 598 case SO_BSDCOMPAT: 599 sock_warn_obsolete_bsdism("setsockopt"); 600 break; 601 602 case SO_PASSCRED: 603 if (valbool) 604 set_bit(SOCK_PASSCRED, &sock->flags); 605 else 606 clear_bit(SOCK_PASSCRED, &sock->flags); 607 break; 608 609 case SO_TIMESTAMP: 610 case SO_TIMESTAMPNS: 611 if (valbool) { 612 if (optname == SO_TIMESTAMP) 613 sock_reset_flag(sk, SOCK_RCVTSTAMPNS); 614 else 615 sock_set_flag(sk, SOCK_RCVTSTAMPNS); 616 sock_set_flag(sk, SOCK_RCVTSTAMP); 617 sock_enable_timestamp(sk); 618 } else { 619 sock_reset_flag(sk, SOCK_RCVTSTAMP); 620 sock_reset_flag(sk, SOCK_RCVTSTAMPNS); 621 } 622 break; 623 624 case SO_RCVLOWAT: 625 if (val < 0) 626 val = INT_MAX; 627 sk->sk_rcvlowat = val ? : 1; 628 break; 629 630 case SO_RCVTIMEO: 631 ret = sock_set_timeout(&sk->sk_rcvtimeo, optval, optlen); 632 break; 633 634 case SO_SNDTIMEO: 635 ret = sock_set_timeout(&sk->sk_sndtimeo, optval, optlen); 636 break; 637 638 case SO_ATTACH_FILTER: 639 ret = -EINVAL; 640 if (optlen == sizeof(struct sock_fprog)) { 641 struct sock_fprog fprog; 642 643 ret = -EFAULT; 644 if (copy_from_user(&fprog, optval, sizeof(fprog))) 645 break; 646 647 ret = sk_attach_filter(&fprog, sk); 648 } 649 break; 650 651 case SO_DETACH_FILTER: 652 ret = sk_detach_filter(sk); 653 break; 654 655 case SO_PASSSEC: 656 if (valbool) 657 set_bit(SOCK_PASSSEC, &sock->flags); 658 else 659 clear_bit(SOCK_PASSSEC, &sock->flags); 660 break; 661 case SO_MARK: 662 if (!capable(CAP_NET_ADMIN)) 663 ret = -EPERM; 664 else { 665 sk->sk_mark = val; 666 } 667 break; 668 669 /* We implement the SO_SNDLOWAT etc to 670 not be settable (1003.1g 5.3) */ 671 default: 672 ret = -ENOPROTOOPT; 673 break; 674 } 675 release_sock(sk); 676 return ret; 677} 678 679 680int sock_getsockopt(struct socket *sock, int level, int optname, 681 char __user *optval, int __user *optlen) 682{ 683 struct sock *sk = sock->sk; 684 685 union { 686 int val; 687 struct linger ling; 688 struct timeval tm; 689 } v; 690 691 unsigned int lv = sizeof(int); 692 int len; 693 694 if (get_user(len, optlen)) 695 return -EFAULT; 696 if (len < 0) 697 return -EINVAL; 698 699 switch(optname) { 700 case SO_DEBUG: 701 v.val = sock_flag(sk, SOCK_DBG); 702 break; 703 704 case SO_DONTROUTE: 705 v.val = sock_flag(sk, SOCK_LOCALROUTE); 706 break; 707 708 case SO_BROADCAST: 709 v.val = !!sock_flag(sk, SOCK_BROADCAST); 710 break; 711 712 case SO_SNDBUF: 713 v.val = sk->sk_sndbuf; 714 break; 715 716 case SO_RCVBUF: 717 v.val = sk->sk_rcvbuf; 718 break; 719 720 case SO_REUSEADDR: 721 v.val = sk->sk_reuse; 722 break; 723 724 case SO_KEEPALIVE: 725 v.val = !!sock_flag(sk, SOCK_KEEPOPEN); 726 break; 727 728 case SO_TYPE: 729 v.val = sk->sk_type; 730 break; 731 732 case SO_ERROR: 733 v.val = -sock_error(sk); 734 if (v.val==0) 735 v.val = xchg(&sk->sk_err_soft, 0); 736 break; 737 738 case SO_OOBINLINE: 739 v.val = !!sock_flag(sk, SOCK_URGINLINE); 740 break; 741 742 case SO_NO_CHECK: 743 v.val = sk->sk_no_check; 744 break; 745 746 case SO_PRIORITY: 747 v.val = sk->sk_priority; 748 break; 749 750 case SO_LINGER: 751 lv = sizeof(v.ling); 752 v.ling.l_onoff = !!sock_flag(sk, SOCK_LINGER); 753 v.ling.l_linger = sk->sk_lingertime / HZ; 754 break; 755 756 case SO_BSDCOMPAT: 757 sock_warn_obsolete_bsdism("getsockopt"); 758 break; 759 760 case SO_TIMESTAMP: 761 v.val = sock_flag(sk, SOCK_RCVTSTAMP) && 762 !sock_flag(sk, SOCK_RCVTSTAMPNS); 763 break; 764 765 case SO_TIMESTAMPNS: 766 v.val = sock_flag(sk, SOCK_RCVTSTAMPNS); 767 break; 768 769 case SO_RCVTIMEO: 770 lv=sizeof(struct timeval); 771 if (sk->sk_rcvtimeo == MAX_SCHEDULE_TIMEOUT) { 772 v.tm.tv_sec = 0; 773 v.tm.tv_usec = 0; 774 } else { 775 v.tm.tv_sec = sk->sk_rcvtimeo / HZ; 776 v.tm.tv_usec = ((sk->sk_rcvtimeo % HZ) * 1000000) / HZ; 777 } 778 break; 779 780 case SO_SNDTIMEO: 781 lv=sizeof(struct timeval); 782 if (sk->sk_sndtimeo == MAX_SCHEDULE_TIMEOUT) { 783 v.tm.tv_sec = 0; 784 v.tm.tv_usec = 0; 785 } else { 786 v.tm.tv_sec = sk->sk_sndtimeo / HZ; 787 v.tm.tv_usec = ((sk->sk_sndtimeo % HZ) * 1000000) / HZ; 788 } 789 break; 790 791 case SO_RCVLOWAT: 792 v.val = sk->sk_rcvlowat; 793 break; 794 795 case SO_SNDLOWAT: 796 v.val=1; 797 break; 798 799 case SO_PASSCRED: 800 v.val = test_bit(SOCK_PASSCRED, &sock->flags) ? 1 : 0; 801 break; 802 803 case SO_PEERCRED: 804 if (len > sizeof(sk->sk_peercred)) 805 len = sizeof(sk->sk_peercred); 806 if (copy_to_user(optval, &sk->sk_peercred, len)) 807 return -EFAULT; 808 goto lenout; 809 810 case SO_PEERNAME: 811 { 812 char address[128]; 813 814 if (sock->ops->getname(sock, (struct sockaddr *)address, &lv, 2)) 815 return -ENOTCONN; 816 if (lv < len) 817 return -EINVAL; 818 if (copy_to_user(optval, address, len)) 819 return -EFAULT; 820 goto lenout; 821 } 822 823 /* Dubious BSD thing... Probably nobody even uses it, but 824 * the UNIX standard wants it for whatever reason... -DaveM 825 */ 826 case SO_ACCEPTCONN: 827 v.val = sk->sk_state == TCP_LISTEN; 828 break; 829 830 case SO_PASSSEC: 831 v.val = test_bit(SOCK_PASSSEC, &sock->flags) ? 1 : 0; 832 break; 833 834 case SO_PEERSEC: 835 return security_socket_getpeersec_stream(sock, optval, optlen, len); 836 837 case SO_MARK: 838 v.val = sk->sk_mark; 839 break; 840 841 default: 842 return -ENOPROTOOPT; 843 } 844 845 if (len > lv) 846 len = lv; 847 if (copy_to_user(optval, &v, len)) 848 return -EFAULT; 849lenout: 850 if (put_user(len, optlen)) 851 return -EFAULT; 852 return 0; 853} 854 855/* 856 * Initialize an sk_lock. 857 * 858 * (We also register the sk_lock with the lock validator.) 859 */ 860static inline void sock_lock_init(struct sock *sk) 861{ 862 sock_lock_init_class_and_name(sk, 863 af_family_slock_key_strings[sk->sk_family], 864 af_family_slock_keys + sk->sk_family, 865 af_family_key_strings[sk->sk_family], 866 af_family_keys + sk->sk_family); 867} 868 869static void sock_copy(struct sock *nsk, const struct sock *osk) 870{ 871#ifdef CONFIG_SECURITY_NETWORK 872 void *sptr = nsk->sk_security; 873#endif 874 875 memcpy(nsk, osk, osk->sk_prot->obj_size); 876#ifdef CONFIG_SECURITY_NETWORK 877 nsk->sk_security = sptr; 878 security_sk_clone(osk, nsk); 879#endif 880} 881 882static struct sock *sk_prot_alloc(struct proto *prot, gfp_t priority, 883 int family) 884{ 885 struct sock *sk; 886 struct kmem_cache *slab; 887 888 slab = prot->slab; 889 if (slab != NULL) 890 sk = kmem_cache_alloc(slab, priority); 891 else 892 sk = kmalloc(prot->obj_size, priority); 893 894 if (sk != NULL) { 895 if (security_sk_alloc(sk, family, priority)) 896 goto out_free; 897 898 if (!try_module_get(prot->owner)) 899 goto out_free_sec; 900 } 901 902 return sk; 903 904out_free_sec: 905 security_sk_free(sk); 906out_free: 907 if (slab != NULL) 908 kmem_cache_free(slab, sk); 909 else 910 kfree(sk); 911 return NULL; 912} 913 914static void sk_prot_free(struct proto *prot, struct sock *sk) 915{ 916 struct kmem_cache *slab; 917 struct module *owner; 918 919 owner = prot->owner; 920 slab = prot->slab; 921 922 security_sk_free(sk); 923 if (slab != NULL) 924 kmem_cache_free(slab, sk); 925 else 926 kfree(sk); 927 module_put(owner); 928} 929 930/** 931 * sk_alloc - All socket objects are allocated here 932 * @net: the applicable net namespace 933 * @family: protocol family 934 * @priority: for allocation (%GFP_KERNEL, %GFP_ATOMIC, etc) 935 * @prot: struct proto associated with this new sock instance 936 * @zero_it: if we should zero the newly allocated sock 937 */ 938struct sock *sk_alloc(struct net *net, int family, gfp_t priority, 939 struct proto *prot) 940{ 941 struct sock *sk; 942 943 sk = sk_prot_alloc(prot, priority | __GFP_ZERO, family); 944 if (sk) { 945 sk->sk_family = family; 946 /* 947 * See comment in struct sock definition to understand 948 * why we need sk_prot_creator -acme 949 */ 950 sk->sk_prot = sk->sk_prot_creator = prot; 951 sock_lock_init(sk); 952 sock_net_set(sk, get_net(net)); 953 } 954 955 return sk; 956} 957 958void sk_free(struct sock *sk) 959{ 960 struct sk_filter *filter; 961 962 if (sk->sk_destruct) 963 sk->sk_destruct(sk); 964 965 filter = rcu_dereference(sk->sk_filter); 966 if (filter) { 967 sk_filter_uncharge(sk, filter); 968 rcu_assign_pointer(sk->sk_filter, NULL); 969 } 970 971 sock_disable_timestamp(sk); 972 973 if (atomic_read(&sk->sk_omem_alloc)) 974 printk(KERN_DEBUG "%s: optmem leakage (%d bytes) detected.\n", 975 __func__, atomic_read(&sk->sk_omem_alloc)); 976 977 put_net(sock_net(sk)); 978 sk_prot_free(sk->sk_prot_creator, sk); 979} 980 981/* 982 * Last sock_put should drop referrence to sk->sk_net. It has already 983 * been dropped in sk_change_net. Taking referrence to stopping namespace 984 * is not an option. 985 * Take referrence to a socket to remove it from hash _alive_ and after that 986 * destroy it in the context of init_net. 987 */ 988void sk_release_kernel(struct sock *sk) 989{ 990 if (sk == NULL || sk->sk_socket == NULL) 991 return; 992 993 sock_hold(sk); 994 sock_release(sk->sk_socket); 995 release_net(sock_net(sk)); 996 sock_net_set(sk, get_net(&init_net)); 997 sock_put(sk); 998} 999EXPORT_SYMBOL(sk_release_kernel); 1000 1001struct sock *sk_clone(const struct sock *sk, const gfp_t priority) 1002{ 1003 struct sock *newsk; 1004 1005 newsk = sk_prot_alloc(sk->sk_prot, priority, sk->sk_family); 1006 if (newsk != NULL) { 1007 struct sk_filter *filter; 1008 1009 sock_copy(newsk, sk); 1010 1011 /* SANITY */ 1012 get_net(sock_net(newsk)); 1013 sk_node_init(&newsk->sk_node); 1014 sock_lock_init(newsk); 1015 bh_lock_sock(newsk); 1016 newsk->sk_backlog.head = newsk->sk_backlog.tail = NULL; 1017 1018 atomic_set(&newsk->sk_rmem_alloc, 0); 1019 atomic_set(&newsk->sk_wmem_alloc, 0); 1020 atomic_set(&newsk->sk_omem_alloc, 0); 1021 skb_queue_head_init(&newsk->sk_receive_queue); 1022 skb_queue_head_init(&newsk->sk_write_queue); 1023#ifdef CONFIG_NET_DMA 1024 skb_queue_head_init(&newsk->sk_async_wait_queue); 1025#endif 1026 1027 rwlock_init(&newsk->sk_dst_lock); 1028 rwlock_init(&newsk->sk_callback_lock); 1029 lockdep_set_class_and_name(&newsk->sk_callback_lock, 1030 af_callback_keys + newsk->sk_family, 1031 af_family_clock_key_strings[newsk->sk_family]); 1032 1033 newsk->sk_dst_cache = NULL; 1034 newsk->sk_wmem_queued = 0; 1035 newsk->sk_forward_alloc = 0; 1036 newsk->sk_send_head = NULL; 1037 newsk->sk_userlocks = sk->sk_userlocks & ~SOCK_BINDPORT_LOCK; 1038 1039 sock_reset_flag(newsk, SOCK_DONE); 1040 skb_queue_head_init(&newsk->sk_error_queue); 1041 1042 filter = newsk->sk_filter; 1043 if (filter != NULL) 1044 sk_filter_charge(newsk, filter); 1045 1046 if (unlikely(xfrm_sk_clone_policy(newsk))) { 1047 /* It is still raw copy of parent, so invalidate 1048 * destructor and make plain sk_free() */ 1049 newsk->sk_destruct = NULL; 1050 sk_free(newsk); 1051 newsk = NULL; 1052 goto out; 1053 } 1054 1055 newsk->sk_err = 0; 1056 newsk->sk_priority = 0; 1057 atomic_set(&newsk->sk_refcnt, 2); 1058 1059 /* 1060 * Increment the counter in the same struct proto as the master 1061 * sock (sk_refcnt_debug_inc uses newsk->sk_prot->socks, that 1062 * is the same as sk->sk_prot->socks, as this field was copied 1063 * with memcpy). 1064 * 1065 * This _changes_ the previous behaviour, where 1066 * tcp_create_openreq_child always was incrementing the 1067 * equivalent to tcp_prot->socks (inet_sock_nr), so this have 1068 * to be taken into account in all callers. -acme 1069 */ 1070 sk_refcnt_debug_inc(newsk); 1071 newsk->sk_socket = NULL; 1072 newsk->sk_sleep = NULL; 1073 1074 if (newsk->sk_prot->sockets_allocated) 1075 atomic_inc(newsk->sk_prot->sockets_allocated); 1076 } 1077out: 1078 return newsk; 1079} 1080 1081EXPORT_SYMBOL_GPL(sk_clone); 1082 1083void sk_setup_caps(struct sock *sk, struct dst_entry *dst) 1084{ 1085 __sk_dst_set(sk, dst); 1086 sk->sk_route_caps = dst->dev->features; 1087 if (sk->sk_route_caps & NETIF_F_GSO) 1088 sk->sk_route_caps |= NETIF_F_GSO_SOFTWARE; 1089 if (sk_can_gso(sk)) { 1090 if (dst->header_len) { 1091 sk->sk_route_caps &= ~NETIF_F_GSO_MASK; 1092 } else { 1093 sk->sk_route_caps |= NETIF_F_SG | NETIF_F_HW_CSUM; 1094 sk->sk_gso_max_size = dst->dev->gso_max_size; 1095 } 1096 } 1097} 1098EXPORT_SYMBOL_GPL(sk_setup_caps); 1099 1100void __init sk_init(void) 1101{ 1102 if (num_physpages <= 4096) { 1103 sysctl_wmem_max = 32767; 1104 sysctl_rmem_max = 32767; 1105 sysctl_wmem_default = 32767; 1106 sysctl_rmem_default = 32767; 1107 } else if (num_physpages >= 131072) { 1108 sysctl_wmem_max = 131071; 1109 sysctl_rmem_max = 131071; 1110 } 1111} 1112 1113/* 1114 * Simple resource managers for sockets. 1115 */ 1116 1117 1118/* 1119 * Write buffer destructor automatically called from kfree_skb. 1120 */ 1121void sock_wfree(struct sk_buff *skb) 1122{ 1123 struct sock *sk = skb->sk; 1124 1125 /* In case it might be waiting for more memory. */ 1126 atomic_sub(skb->truesize, &sk->sk_wmem_alloc); 1127 if (!sock_flag(sk, SOCK_USE_WRITE_QUEUE)) 1128 sk->sk_write_space(sk); 1129 sock_put(sk); 1130} 1131 1132/* 1133 * Read buffer destructor automatically called from kfree_skb. 1134 */ 1135void sock_rfree(struct sk_buff *skb) 1136{ 1137 struct sock *sk = skb->sk; 1138 1139 skb_truesize_check(skb); 1140 atomic_sub(skb->truesize, &sk->sk_rmem_alloc); 1141 sk_mem_uncharge(skb->sk, skb->truesize); 1142} 1143 1144 1145int sock_i_uid(struct sock *sk) 1146{ 1147 int uid; 1148 1149 read_lock(&sk->sk_callback_lock); 1150 uid = sk->sk_socket ? SOCK_INODE(sk->sk_socket)->i_uid : 0; 1151 read_unlock(&sk->sk_callback_lock); 1152 return uid; 1153} 1154 1155unsigned long sock_i_ino(struct sock *sk) 1156{ 1157 unsigned long ino; 1158 1159 read_lock(&sk->sk_callback_lock); 1160 ino = sk->sk_socket ? SOCK_INODE(sk->sk_socket)->i_ino : 0; 1161 read_unlock(&sk->sk_callback_lock); 1162 return ino; 1163} 1164 1165/* 1166 * Allocate a skb from the socket's send buffer. 1167 */ 1168struct sk_buff *sock_wmalloc(struct sock *sk, unsigned long size, int force, 1169 gfp_t priority) 1170{ 1171 if (force || atomic_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf) { 1172 struct sk_buff * skb = alloc_skb(size, priority); 1173 if (skb) { 1174 skb_set_owner_w(skb, sk); 1175 return skb; 1176 } 1177 } 1178 return NULL; 1179} 1180 1181/* 1182 * Allocate a skb from the socket's receive buffer. 1183 */ 1184struct sk_buff *sock_rmalloc(struct sock *sk, unsigned long size, int force, 1185 gfp_t priority) 1186{ 1187 if (force || atomic_read(&sk->sk_rmem_alloc) < sk->sk_rcvbuf) { 1188 struct sk_buff *skb = alloc_skb(size, priority); 1189 if (skb) { 1190 skb_set_owner_r(skb, sk); 1191 return skb; 1192 } 1193 } 1194 return NULL; 1195} 1196 1197/* 1198 * Allocate a memory block from the socket's option memory buffer. 1199 */ 1200void *sock_kmalloc(struct sock *sk, int size, gfp_t priority) 1201{ 1202 if ((unsigned)size <= sysctl_optmem_max && 1203 atomic_read(&sk->sk_omem_alloc) + size < sysctl_optmem_max) { 1204 void *mem; 1205 /* First do the add, to avoid the race if kmalloc 1206 * might sleep. 1207 */ 1208 atomic_add(size, &sk->sk_omem_alloc); 1209 mem = kmalloc(size, priority); 1210 if (mem) 1211 return mem; 1212 atomic_sub(size, &sk->sk_omem_alloc); 1213 } 1214 return NULL; 1215} 1216 1217/* 1218 * Free an option memory block. 1219 */ 1220void sock_kfree_s(struct sock *sk, void *mem, int size) 1221{ 1222 kfree(mem); 1223 atomic_sub(size, &sk->sk_omem_alloc); 1224} 1225 1226/* It is almost wait_for_tcp_memory minus release_sock/lock_sock. 1227 I think, these locks should be removed for datagram sockets. 1228 */ 1229static long sock_wait_for_wmem(struct sock * sk, long timeo) 1230{ 1231 DEFINE_WAIT(wait); 1232 1233 clear_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags); 1234 for (;;) { 1235 if (!timeo) 1236 break; 1237 if (signal_pending(current)) 1238 break; 1239 set_bit(SOCK_NOSPACE, &sk->sk_socket->flags); 1240 prepare_to_wait(sk->sk_sleep, &wait, TASK_INTERRUPTIBLE); 1241 if (atomic_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf) 1242 break; 1243 if (sk->sk_shutdown & SEND_SHUTDOWN) 1244 break; 1245 if (sk->sk_err) 1246 break; 1247 timeo = schedule_timeout(timeo); 1248 } 1249 finish_wait(sk->sk_sleep, &wait); 1250 return timeo; 1251} 1252 1253 1254/* 1255 * Generic send/receive buffer handlers 1256 */ 1257 1258static struct sk_buff *sock_alloc_send_pskb(struct sock *sk, 1259 unsigned long header_len, 1260 unsigned long data_len, 1261 int noblock, int *errcode) 1262{ 1263 struct sk_buff *skb; 1264 gfp_t gfp_mask; 1265 long timeo; 1266 int err; 1267 1268 gfp_mask = sk->sk_allocation; 1269 if (gfp_mask & __GFP_WAIT) 1270 gfp_mask |= __GFP_REPEAT; 1271 1272 timeo = sock_sndtimeo(sk, noblock); 1273 while (1) { 1274 err = sock_error(sk); 1275 if (err != 0) 1276 goto failure; 1277 1278 err = -EPIPE; 1279 if (sk->sk_shutdown & SEND_SHUTDOWN) 1280 goto failure; 1281 1282 if (atomic_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf) { 1283 skb = alloc_skb(header_len, gfp_mask); 1284 if (skb) { 1285 int npages; 1286 int i; 1287 1288 /* No pages, we're done... */ 1289 if (!data_len) 1290 break; 1291 1292 npages = (data_len + (PAGE_SIZE - 1)) >> PAGE_SHIFT; 1293 skb->truesize += data_len; 1294 skb_shinfo(skb)->nr_frags = npages; 1295 for (i = 0; i < npages; i++) { 1296 struct page *page; 1297 skb_frag_t *frag; 1298 1299 page = alloc_pages(sk->sk_allocation, 0); 1300 if (!page) { 1301 err = -ENOBUFS; 1302 skb_shinfo(skb)->nr_frags = i; 1303 kfree_skb(skb); 1304 goto failure; 1305 } 1306 1307 frag = &skb_shinfo(skb)->frags[i]; 1308 frag->page = page; 1309 frag->page_offset = 0; 1310 frag->size = (data_len >= PAGE_SIZE ? 1311 PAGE_SIZE : 1312 data_len); 1313 data_len -= PAGE_SIZE; 1314 } 1315 1316 /* Full success... */ 1317 break; 1318 } 1319 err = -ENOBUFS; 1320 goto failure; 1321 } 1322 set_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags); 1323 set_bit(SOCK_NOSPACE, &sk->sk_socket->flags); 1324 err = -EAGAIN; 1325 if (!timeo) 1326 goto failure; 1327 if (signal_pending(current)) 1328 goto interrupted; 1329 timeo = sock_wait_for_wmem(sk, timeo); 1330 } 1331 1332 skb_set_owner_w(skb, sk); 1333 return skb; 1334 1335interrupted: 1336 err = sock_intr_errno(timeo); 1337failure: 1338 *errcode = err; 1339 return NULL; 1340} 1341 1342struct sk_buff *sock_alloc_send_skb(struct sock *sk, unsigned long size, 1343 int noblock, int *errcode) 1344{ 1345 return sock_alloc_send_pskb(sk, size, 0, noblock, errcode); 1346} 1347 1348static void __lock_sock(struct sock *sk) 1349{ 1350 DEFINE_WAIT(wait); 1351 1352 for (;;) { 1353 prepare_to_wait_exclusive(&sk->sk_lock.wq, &wait, 1354 TASK_UNINTERRUPTIBLE); 1355 spin_unlock_bh(&sk->sk_lock.slock); 1356 schedule(); 1357 spin_lock_bh(&sk->sk_lock.slock); 1358 if (!sock_owned_by_user(sk)) 1359 break; 1360 } 1361 finish_wait(&sk->sk_lock.wq, &wait); 1362} 1363 1364static void __release_sock(struct sock *sk) 1365{ 1366 struct sk_buff *skb = sk->sk_backlog.head; 1367 1368 do { 1369 sk->sk_backlog.head = sk->sk_backlog.tail = NULL; 1370 bh_unlock_sock(sk); 1371 1372 do { 1373 struct sk_buff *next = skb->next; 1374 1375 skb->next = NULL; 1376 sk->sk_backlog_rcv(sk, skb); 1377 1378 /* 1379 * We are in process context here with softirqs 1380 * disabled, use cond_resched_softirq() to preempt. 1381 * This is safe to do because we've taken the backlog 1382 * queue private: 1383 */ 1384 cond_resched_softirq(); 1385 1386 skb = next; 1387 } while (skb != NULL); 1388 1389 bh_lock_sock(sk); 1390 } while ((skb = sk->sk_backlog.head) != NULL); 1391} 1392 1393/** 1394 * sk_wait_data - wait for data to arrive at sk_receive_queue 1395 * @sk: sock to wait on 1396 * @timeo: for how long 1397 * 1398 * Now socket state including sk->sk_err is changed only under lock, 1399 * hence we may omit checks after joining wait queue. 1400 * We check receive queue before schedule() only as optimization; 1401 * it is very likely that release_sock() added new data. 1402 */ 1403int sk_wait_data(struct sock *sk, long *timeo) 1404{ 1405 int rc; 1406 DEFINE_WAIT(wait); 1407 1408 prepare_to_wait(sk->sk_sleep, &wait, TASK_INTERRUPTIBLE); 1409 set_bit(SOCK_ASYNC_WAITDATA, &sk->sk_socket->flags); 1410 rc = sk_wait_event(sk, timeo, !skb_queue_empty(&sk->sk_receive_queue)); 1411 clear_bit(SOCK_ASYNC_WAITDATA, &sk->sk_socket->flags); 1412 finish_wait(sk->sk_sleep, &wait); 1413 return rc; 1414} 1415 1416EXPORT_SYMBOL(sk_wait_data); 1417 1418/** 1419 * __sk_mem_schedule - increase sk_forward_alloc and memory_allocated 1420 * @sk: socket 1421 * @size: memory size to allocate 1422 * @kind: allocation type 1423 * 1424 * If kind is SK_MEM_SEND, it means wmem allocation. Otherwise it means 1425 * rmem allocation. This function assumes that protocols which have 1426 * memory_pressure use sk_wmem_queued as write buffer accounting. 1427 */ 1428int __sk_mem_schedule(struct sock *sk, int size, int kind) 1429{ 1430 struct proto *prot = sk->sk_prot; 1431 int amt = sk_mem_pages(size); 1432 int allocated; 1433 1434 sk->sk_forward_alloc += amt * SK_MEM_QUANTUM; 1435 allocated = atomic_add_return(amt, prot->memory_allocated); 1436 1437 /* Under limit. */ 1438 if (allocated <= prot->sysctl_mem[0]) { 1439 if (prot->memory_pressure && *prot->memory_pressure) 1440 *prot->memory_pressure = 0; 1441 return 1; 1442 } 1443 1444 /* Under pressure. */ 1445 if (allocated > prot->sysctl_mem[1]) 1446 if (prot->enter_memory_pressure) 1447 prot->enter_memory_pressure(); 1448 1449 /* Over hard limit. */ 1450 if (allocated > prot->sysctl_mem[2]) 1451 goto suppress_allocation; 1452 1453 /* guarantee minimum buffer size under pressure */ 1454 if (kind == SK_MEM_RECV) { 1455 if (atomic_read(&sk->sk_rmem_alloc) < prot->sysctl_rmem[0]) 1456 return 1; 1457 } else { /* SK_MEM_SEND */ 1458 if (sk->sk_type == SOCK_STREAM) { 1459 if (sk->sk_wmem_queued < prot->sysctl_wmem[0]) 1460 return 1; 1461 } else if (atomic_read(&sk->sk_wmem_alloc) < 1462 prot->sysctl_wmem[0]) 1463 return 1; 1464 } 1465 1466 if (prot->memory_pressure) { 1467 if (!*prot->memory_pressure || 1468 prot->sysctl_mem[2] > atomic_read(prot->sockets_allocated) * 1469 sk_mem_pages(sk->sk_wmem_queued + 1470 atomic_read(&sk->sk_rmem_alloc) + 1471 sk->sk_forward_alloc)) 1472 return 1; 1473 } 1474 1475suppress_allocation: 1476 1477 if (kind == SK_MEM_SEND && sk->sk_type == SOCK_STREAM) { 1478 sk_stream_moderate_sndbuf(sk); 1479 1480 /* Fail only if socket is _under_ its sndbuf. 1481 * In this case we cannot block, so that we have to fail. 1482 */ 1483 if (sk->sk_wmem_queued + size >= sk->sk_sndbuf) 1484 return 1; 1485 } 1486 1487 /* Alas. Undo changes. */ 1488 sk->sk_forward_alloc -= amt * SK_MEM_QUANTUM; 1489 atomic_sub(amt, prot->memory_allocated); 1490 return 0; 1491} 1492 1493EXPORT_SYMBOL(__sk_mem_schedule); 1494 1495/** 1496 * __sk_reclaim - reclaim memory_allocated 1497 * @sk: socket 1498 */ 1499void __sk_mem_reclaim(struct sock *sk) 1500{ 1501 struct proto *prot = sk->sk_prot; 1502 1503 atomic_sub(sk->sk_forward_alloc >> SK_MEM_QUANTUM_SHIFT, 1504 prot->memory_allocated); 1505 sk->sk_forward_alloc &= SK_MEM_QUANTUM - 1; 1506 1507 if (prot->memory_pressure && *prot->memory_pressure && 1508 (atomic_read(prot->memory_allocated) < prot->sysctl_mem[0])) 1509 *prot->memory_pressure = 0; 1510} 1511 1512EXPORT_SYMBOL(__sk_mem_reclaim); 1513 1514 1515/* 1516 * Set of default routines for initialising struct proto_ops when 1517 * the protocol does not support a particular function. In certain 1518 * cases where it makes no sense for a protocol to have a "do nothing" 1519 * function, some default processing is provided. 1520 */ 1521 1522int sock_no_bind(struct socket *sock, struct sockaddr *saddr, int len) 1523{ 1524 return -EOPNOTSUPP; 1525} 1526 1527int sock_no_connect(struct socket *sock, struct sockaddr *saddr, 1528 int len, int flags) 1529{ 1530 return -EOPNOTSUPP; 1531} 1532 1533int sock_no_socketpair(struct socket *sock1, struct socket *sock2) 1534{ 1535 return -EOPNOTSUPP; 1536} 1537 1538int sock_no_accept(struct socket *sock, struct socket *newsock, int flags) 1539{ 1540 return -EOPNOTSUPP; 1541} 1542 1543int sock_no_getname(struct socket *sock, struct sockaddr *saddr, 1544 int *len, int peer) 1545{ 1546 return -EOPNOTSUPP; 1547} 1548 1549unsigned int sock_no_poll(struct file * file, struct socket *sock, poll_table *pt) 1550{ 1551 return 0; 1552} 1553 1554int sock_no_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg) 1555{ 1556 return -EOPNOTSUPP; 1557} 1558 1559int sock_no_listen(struct socket *sock, int backlog) 1560{ 1561 return -EOPNOTSUPP; 1562} 1563 1564int sock_no_shutdown(struct socket *sock, int how) 1565{ 1566 return -EOPNOTSUPP; 1567} 1568 1569int sock_no_setsockopt(struct socket *sock, int level, int optname, 1570 char __user *optval, int optlen) 1571{ 1572 return -EOPNOTSUPP; 1573} 1574 1575int sock_no_getsockopt(struct socket *sock, int level, int optname, 1576 char __user *optval, int __user *optlen) 1577{ 1578 return -EOPNOTSUPP; 1579} 1580 1581int sock_no_sendmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *m, 1582 size_t len) 1583{ 1584 return -EOPNOTSUPP; 1585} 1586 1587int sock_no_recvmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *m, 1588 size_t len, int flags) 1589{ 1590 return -EOPNOTSUPP; 1591} 1592 1593int sock_no_mmap(struct file *file, struct socket *sock, struct vm_area_struct *vma) 1594{ 1595 /* Mirror missing mmap method error code */ 1596 return -ENODEV; 1597} 1598 1599ssize_t sock_no_sendpage(struct socket *sock, struct page *page, int offset, size_t size, int flags) 1600{ 1601 ssize_t res; 1602 struct msghdr msg = {.msg_flags = flags}; 1603 struct kvec iov; 1604 char *kaddr = kmap(page); 1605 iov.iov_base = kaddr + offset; 1606 iov.iov_len = size; 1607 res = kernel_sendmsg(sock, &msg, &iov, 1, size); 1608 kunmap(page); 1609 return res; 1610} 1611 1612/* 1613 * Default Socket Callbacks 1614 */ 1615 1616static void sock_def_wakeup(struct sock *sk) 1617{ 1618 read_lock(&sk->sk_callback_lock); 1619 if (sk->sk_sleep && waitqueue_active(sk->sk_sleep)) 1620 wake_up_interruptible_all(sk->sk_sleep); 1621 read_unlock(&sk->sk_callback_lock); 1622} 1623 1624static void sock_def_error_report(struct sock *sk) 1625{ 1626 read_lock(&sk->sk_callback_lock); 1627 if (sk->sk_sleep && waitqueue_active(sk->sk_sleep)) 1628 wake_up_interruptible(sk->sk_sleep); 1629 sk_wake_async(sk, SOCK_WAKE_IO, POLL_ERR); 1630 read_unlock(&sk->sk_callback_lock); 1631} 1632 1633static void sock_def_readable(struct sock *sk, int len) 1634{ 1635 read_lock(&sk->sk_callback_lock); 1636 if (sk->sk_sleep && waitqueue_active(sk->sk_sleep)) 1637 wake_up_interruptible_sync(sk->sk_sleep); 1638 sk_wake_async(sk, SOCK_WAKE_WAITD, POLL_IN); 1639 read_unlock(&sk->sk_callback_lock); 1640} 1641 1642static void sock_def_write_space(struct sock *sk) 1643{ 1644 read_lock(&sk->sk_callback_lock); 1645 1646 /* Do not wake up a writer until he can make "significant" 1647 * progress. --DaveM 1648 */ 1649 if ((atomic_read(&sk->sk_wmem_alloc) << 1) <= sk->sk_sndbuf) { 1650 if (sk->sk_sleep && waitqueue_active(sk->sk_sleep)) 1651 wake_up_interruptible_sync(sk->sk_sleep); 1652 1653 /* Should agree with poll, otherwise some programs break */ 1654 if (sock_writeable(sk)) 1655 sk_wake_async(sk, SOCK_WAKE_SPACE, POLL_OUT); 1656 } 1657 1658 read_unlock(&sk->sk_callback_lock); 1659} 1660 1661static void sock_def_destruct(struct sock *sk) 1662{ 1663 kfree(sk->sk_protinfo); 1664} 1665 1666void sk_send_sigurg(struct sock *sk) 1667{ 1668 if (sk->sk_socket && sk->sk_socket->file) 1669 if (send_sigurg(&sk->sk_socket->file->f_owner)) 1670 sk_wake_async(sk, SOCK_WAKE_URG, POLL_PRI); 1671} 1672 1673void sk_reset_timer(struct sock *sk, struct timer_list* timer, 1674 unsigned long expires) 1675{ 1676 if (!mod_timer(timer, expires)) 1677 sock_hold(sk); 1678} 1679 1680EXPORT_SYMBOL(sk_reset_timer); 1681 1682void sk_stop_timer(struct sock *sk, struct timer_list* timer) 1683{ 1684 if (timer_pending(timer) && del_timer(timer)) 1685 __sock_put(sk); 1686} 1687 1688EXPORT_SYMBOL(sk_stop_timer); 1689 1690void sock_init_data(struct socket *sock, struct sock *sk) 1691{ 1692 skb_queue_head_init(&sk->sk_receive_queue); 1693 skb_queue_head_init(&sk->sk_write_queue); 1694 skb_queue_head_init(&sk->sk_error_queue); 1695#ifdef CONFIG_NET_DMA 1696 skb_queue_head_init(&sk->sk_async_wait_queue); 1697#endif 1698 1699 sk->sk_send_head = NULL; 1700 1701 init_timer(&sk->sk_timer); 1702 1703 sk->sk_allocation = GFP_KERNEL; 1704 sk->sk_rcvbuf = sysctl_rmem_default; 1705 sk->sk_sndbuf = sysctl_wmem_default; 1706 sk->sk_state = TCP_CLOSE; 1707 sk->sk_socket = sock; 1708 1709 sock_set_flag(sk, SOCK_ZAPPED); 1710 1711 if (sock) { 1712 sk->sk_type = sock->type; 1713 sk->sk_sleep = &sock->wait; 1714 sock->sk = sk; 1715 } else 1716 sk->sk_sleep = NULL; 1717 1718 rwlock_init(&sk->sk_dst_lock); 1719 rwlock_init(&sk->sk_callback_lock); 1720 lockdep_set_class_and_name(&sk->sk_callback_lock, 1721 af_callback_keys + sk->sk_family, 1722 af_family_clock_key_strings[sk->sk_family]); 1723 1724 sk->sk_state_change = sock_def_wakeup; 1725 sk->sk_data_ready = sock_def_readable; 1726 sk->sk_write_space = sock_def_write_space; 1727 sk->sk_error_report = sock_def_error_report; 1728 sk->sk_destruct = sock_def_destruct; 1729 1730 sk->sk_sndmsg_page = NULL; 1731 sk->sk_sndmsg_off = 0; 1732 1733 sk->sk_peercred.pid = 0; 1734 sk->sk_peercred.uid = -1; 1735 sk->sk_peercred.gid = -1; 1736 sk->sk_write_pending = 0; 1737 sk->sk_rcvlowat = 1; 1738 sk->sk_rcvtimeo = MAX_SCHEDULE_TIMEOUT; 1739 sk->sk_sndtimeo = MAX_SCHEDULE_TIMEOUT; 1740 1741 sk->sk_stamp = ktime_set(-1L, 0); 1742 1743 atomic_set(&sk->sk_refcnt, 1); 1744 atomic_set(&sk->sk_drops, 0); 1745} 1746 1747void lock_sock_nested(struct sock *sk, int subclass) 1748{ 1749 might_sleep(); 1750 spin_lock_bh(&sk->sk_lock.slock); 1751 if (sk->sk_lock.owned) 1752 __lock_sock(sk); 1753 sk->sk_lock.owned = 1; 1754 spin_unlock(&sk->sk_lock.slock); 1755 /* 1756 * The sk_lock has mutex_lock() semantics here: 1757 */ 1758 mutex_acquire(&sk->sk_lock.dep_map, subclass, 0, _RET_IP_); 1759 local_bh_enable(); 1760} 1761 1762EXPORT_SYMBOL(lock_sock_nested); 1763 1764void release_sock(struct sock *sk) 1765{ 1766 /* 1767 * The sk_lock has mutex_unlock() semantics: 1768 */ 1769 mutex_release(&sk->sk_lock.dep_map, 1, _RET_IP_); 1770 1771 spin_lock_bh(&sk->sk_lock.slock); 1772 if (sk->sk_backlog.tail) 1773 __release_sock(sk); 1774 sk->sk_lock.owned = 0; 1775 if (waitqueue_active(&sk->sk_lock.wq)) 1776 wake_up(&sk->sk_lock.wq); 1777 spin_unlock_bh(&sk->sk_lock.slock); 1778} 1779EXPORT_SYMBOL(release_sock); 1780 1781int sock_get_timestamp(struct sock *sk, struct timeval __user *userstamp) 1782{ 1783 struct timeval tv; 1784 if (!sock_flag(sk, SOCK_TIMESTAMP)) 1785 sock_enable_timestamp(sk); 1786 tv = ktime_to_timeval(sk->sk_stamp); 1787 if (tv.tv_sec == -1) 1788 return -ENOENT; 1789 if (tv.tv_sec == 0) { 1790 sk->sk_stamp = ktime_get_real(); 1791 tv = ktime_to_timeval(sk->sk_stamp); 1792 } 1793 return copy_to_user(userstamp, &tv, sizeof(tv)) ? -EFAULT : 0; 1794} 1795EXPORT_SYMBOL(sock_get_timestamp); 1796 1797int sock_get_timestampns(struct sock *sk, struct timespec __user *userstamp) 1798{ 1799 struct timespec ts; 1800 if (!sock_flag(sk, SOCK_TIMESTAMP)) 1801 sock_enable_timestamp(sk); 1802 ts = ktime_to_timespec(sk->sk_stamp); 1803 if (ts.tv_sec == -1) 1804 return -ENOENT; 1805 if (ts.tv_sec == 0) { 1806 sk->sk_stamp = ktime_get_real(); 1807 ts = ktime_to_timespec(sk->sk_stamp); 1808 } 1809 return copy_to_user(userstamp, &ts, sizeof(ts)) ? -EFAULT : 0; 1810} 1811EXPORT_SYMBOL(sock_get_timestampns); 1812 1813void sock_enable_timestamp(struct sock *sk) 1814{ 1815 if (!sock_flag(sk, SOCK_TIMESTAMP)) { 1816 sock_set_flag(sk, SOCK_TIMESTAMP); 1817 net_enable_timestamp(); 1818 } 1819} 1820 1821/* 1822 * Get a socket option on an socket. 1823 * 1824 * FIX: POSIX 1003.1g is very ambiguous here. It states that 1825 * asynchronous errors should be reported by getsockopt. We assume 1826 * this means if you specify SO_ERROR (otherwise whats the point of it). 1827 */ 1828int sock_common_getsockopt(struct socket *sock, int level, int optname, 1829 char __user *optval, int __user *optlen) 1830{ 1831 struct sock *sk = sock->sk; 1832 1833 return sk->sk_prot->getsockopt(sk, level, optname, optval, optlen); 1834} 1835 1836EXPORT_SYMBOL(sock_common_getsockopt); 1837 1838#ifdef CONFIG_COMPAT 1839int compat_sock_common_getsockopt(struct socket *sock, int level, int optname, 1840 char __user *optval, int __user *optlen) 1841{ 1842 struct sock *sk = sock->sk; 1843 1844 if (sk->sk_prot->compat_getsockopt != NULL) 1845 return sk->sk_prot->compat_getsockopt(sk, level, optname, 1846 optval, optlen); 1847 return sk->sk_prot->getsockopt(sk, level, optname, optval, optlen); 1848} 1849EXPORT_SYMBOL(compat_sock_common_getsockopt); 1850#endif 1851 1852int sock_common_recvmsg(struct kiocb *iocb, struct socket *sock, 1853 struct msghdr *msg, size_t size, int flags) 1854{ 1855 struct sock *sk = sock->sk; 1856 int addr_len = 0; 1857 int err; 1858 1859 err = sk->sk_prot->recvmsg(iocb, sk, msg, size, flags & MSG_DONTWAIT, 1860 flags & ~MSG_DONTWAIT, &addr_len); 1861 if (err >= 0) 1862 msg->msg_namelen = addr_len; 1863 return err; 1864} 1865 1866EXPORT_SYMBOL(sock_common_recvmsg); 1867 1868/* 1869 * Set socket options on an inet socket. 1870 */ 1871int sock_common_setsockopt(struct socket *sock, int level, int optname, 1872 char __user *optval, int optlen) 1873{ 1874 struct sock *sk = sock->sk; 1875 1876 return sk->sk_prot->setsockopt(sk, level, optname, optval, optlen); 1877} 1878 1879EXPORT_SYMBOL(sock_common_setsockopt); 1880 1881#ifdef CONFIG_COMPAT 1882int compat_sock_common_setsockopt(struct socket *sock, int level, int optname, 1883 char __user *optval, int optlen) 1884{ 1885 struct sock *sk = sock->sk; 1886 1887 if (sk->sk_prot->compat_setsockopt != NULL) 1888 return sk->sk_prot->compat_setsockopt(sk, level, optname, 1889 optval, optlen); 1890 return sk->sk_prot->setsockopt(sk, level, optname, optval, optlen); 1891} 1892EXPORT_SYMBOL(compat_sock_common_setsockopt); 1893#endif 1894 1895void sk_common_release(struct sock *sk) 1896{ 1897 if (sk->sk_prot->destroy) 1898 sk->sk_prot->destroy(sk); 1899 1900 /* 1901 * Observation: when sock_common_release is called, processes have 1902 * no access to socket. But net still has. 1903 * Step one, detach it from networking: 1904 * 1905 * A. Remove from hash tables. 1906 */ 1907 1908 sk->sk_prot->unhash(sk); 1909 1910 /* 1911 * In this point socket cannot receive new packets, but it is possible 1912 * that some packets are in flight because some CPU runs receiver and 1913 * did hash table lookup before we unhashed socket. They will achieve 1914 * receive queue and will be purged by socket destructor. 1915 * 1916 * Also we still have packets pending on receive queue and probably, 1917 * our own packets waiting in device queues. sock_destroy will drain 1918 * receive queue, but transmitted packets will delay socket destruction 1919 * until the last reference will be released. 1920 */ 1921 1922 sock_orphan(sk); 1923 1924 xfrm_sk_free_policy(sk); 1925 1926 sk_refcnt_debug_release(sk); 1927 sock_put(sk); 1928} 1929 1930EXPORT_SYMBOL(sk_common_release); 1931 1932static DEFINE_RWLOCK(proto_list_lock); 1933static LIST_HEAD(proto_list); 1934 1935#ifdef CONFIG_PROC_FS 1936#define PROTO_INUSE_NR 64 /* should be enough for the first time */ 1937struct prot_inuse { 1938 int val[PROTO_INUSE_NR]; 1939}; 1940 1941static DECLARE_BITMAP(proto_inuse_idx, PROTO_INUSE_NR); 1942 1943#ifdef CONFIG_NET_NS 1944void sock_prot_inuse_add(struct net *net, struct proto *prot, int val) 1945{ 1946 int cpu = smp_processor_id(); 1947 per_cpu_ptr(net->core.inuse, cpu)->val[prot->inuse_idx] += val; 1948} 1949EXPORT_SYMBOL_GPL(sock_prot_inuse_add); 1950 1951int sock_prot_inuse_get(struct net *net, struct proto *prot) 1952{ 1953 int cpu, idx = prot->inuse_idx; 1954 int res = 0; 1955 1956 for_each_possible_cpu(cpu) 1957 res += per_cpu_ptr(net->core.inuse, cpu)->val[idx]; 1958 1959 return res >= 0 ? res : 0; 1960} 1961EXPORT_SYMBOL_GPL(sock_prot_inuse_get); 1962 1963static int sock_inuse_init_net(struct net *net) 1964{ 1965 net->core.inuse = alloc_percpu(struct prot_inuse); 1966 return net->core.inuse ? 0 : -ENOMEM; 1967} 1968 1969static void sock_inuse_exit_net(struct net *net) 1970{ 1971 free_percpu(net->core.inuse); 1972} 1973 1974static struct pernet_operations net_inuse_ops = { 1975 .init = sock_inuse_init_net, 1976 .exit = sock_inuse_exit_net, 1977}; 1978 1979static __init int net_inuse_init(void) 1980{ 1981 if (register_pernet_subsys(&net_inuse_ops)) 1982 panic("Cannot initialize net inuse counters"); 1983 1984 return 0; 1985} 1986 1987core_initcall(net_inuse_init); 1988#else 1989static DEFINE_PER_CPU(struct prot_inuse, prot_inuse); 1990 1991void sock_prot_inuse_add(struct net *net, struct proto *prot, int val) 1992{ 1993 __get_cpu_var(prot_inuse).val[prot->inuse_idx] += val; 1994} 1995EXPORT_SYMBOL_GPL(sock_prot_inuse_add); 1996 1997int sock_prot_inuse_get(struct net *net, struct proto *prot) 1998{ 1999 int cpu, idx = prot->inuse_idx; 2000 int res = 0; 2001 2002 for_each_possible_cpu(cpu) 2003 res += per_cpu(prot_inuse, cpu).val[idx]; 2004 2005 return res >= 0 ? res : 0; 2006} 2007EXPORT_SYMBOL_GPL(sock_prot_inuse_get); 2008#endif 2009 2010static void assign_proto_idx(struct proto *prot) 2011{ 2012 prot->inuse_idx = find_first_zero_bit(proto_inuse_idx, PROTO_INUSE_NR); 2013 2014 if (unlikely(prot->inuse_idx == PROTO_INUSE_NR - 1)) { 2015 printk(KERN_ERR "PROTO_INUSE_NR exhausted\n"); 2016 return; 2017 } 2018 2019 set_bit(prot->inuse_idx, proto_inuse_idx); 2020} 2021 2022static void release_proto_idx(struct proto *prot) 2023{ 2024 if (prot->inuse_idx != PROTO_INUSE_NR - 1) 2025 clear_bit(prot->inuse_idx, proto_inuse_idx); 2026} 2027#else 2028static inline void assign_proto_idx(struct proto *prot) 2029{ 2030} 2031 2032static inline void release_proto_idx(struct proto *prot) 2033{ 2034} 2035#endif 2036 2037int proto_register(struct proto *prot, int alloc_slab) 2038{ 2039 char *request_sock_slab_name = NULL; 2040 char *timewait_sock_slab_name; 2041 2042 if (alloc_slab) { 2043 prot->slab = kmem_cache_create(prot->name, prot->obj_size, 0, 2044 SLAB_HWCACHE_ALIGN, NULL); 2045 2046 if (prot->slab == NULL) { 2047 printk(KERN_CRIT "%s: Can't create sock SLAB cache!\n", 2048 prot->name); 2049 goto out; 2050 } 2051 2052 if (prot->rsk_prot != NULL) { 2053 static const char mask[] = "request_sock_%s"; 2054 2055 request_sock_slab_name = kmalloc(strlen(prot->name) + sizeof(mask) - 1, GFP_KERNEL); 2056 if (request_sock_slab_name == NULL) 2057 goto out_free_sock_slab; 2058 2059 sprintf(request_sock_slab_name, mask, prot->name); 2060 prot->rsk_prot->slab = kmem_cache_create(request_sock_slab_name, 2061 prot->rsk_prot->obj_size, 0, 2062 SLAB_HWCACHE_ALIGN, NULL); 2063 2064 if (prot->rsk_prot->slab == NULL) { 2065 printk(KERN_CRIT "%s: Can't create request sock SLAB cache!\n", 2066 prot->name); 2067 goto out_free_request_sock_slab_name; 2068 } 2069 } 2070 2071 if (prot->twsk_prot != NULL) { 2072 static const char mask[] = "tw_sock_%s"; 2073 2074 timewait_sock_slab_name = kmalloc(strlen(prot->name) + sizeof(mask) - 1, GFP_KERNEL); 2075 2076 if (timewait_sock_slab_name == NULL) 2077 goto out_free_request_sock_slab; 2078 2079 sprintf(timewait_sock_slab_name, mask, prot->name); 2080 prot->twsk_prot->twsk_slab = 2081 kmem_cache_create(timewait_sock_slab_name, 2082 prot->twsk_prot->twsk_obj_size, 2083 0, SLAB_HWCACHE_ALIGN, 2084 NULL); 2085 if (prot->twsk_prot->twsk_slab == NULL) 2086 goto out_free_timewait_sock_slab_name; 2087 } 2088 } 2089 2090 write_lock(&proto_list_lock); 2091 list_add(&prot->node, &proto_list); 2092 assign_proto_idx(prot); 2093 write_unlock(&proto_list_lock); 2094 return 0; 2095 2096out_free_timewait_sock_slab_name: 2097 kfree(timewait_sock_slab_name); 2098out_free_request_sock_slab: 2099 if (prot->rsk_prot && prot->rsk_prot->slab) { 2100 kmem_cache_destroy(prot->rsk_prot->slab); 2101 prot->rsk_prot->slab = NULL; 2102 } 2103out_free_request_sock_slab_name: 2104 kfree(request_sock_slab_name); 2105out_free_sock_slab: 2106 kmem_cache_destroy(prot->slab); 2107 prot->slab = NULL; 2108out: 2109 return -ENOBUFS; 2110} 2111 2112EXPORT_SYMBOL(proto_register); 2113 2114void proto_unregister(struct proto *prot) 2115{ 2116 write_lock(&proto_list_lock); 2117 release_proto_idx(prot); 2118 list_del(&prot->node); 2119 write_unlock(&proto_list_lock); 2120 2121 if (prot->slab != NULL) { 2122 kmem_cache_destroy(prot->slab); 2123 prot->slab = NULL; 2124 } 2125 2126 if (prot->rsk_prot != NULL && prot->rsk_prot->slab != NULL) { 2127 const char *name = kmem_cache_name(prot->rsk_prot->slab); 2128 2129 kmem_cache_destroy(prot->rsk_prot->slab); 2130 kfree(name); 2131 prot->rsk_prot->slab = NULL; 2132 } 2133 2134 if (prot->twsk_prot != NULL && prot->twsk_prot->twsk_slab != NULL) { 2135 const char *name = kmem_cache_name(prot->twsk_prot->twsk_slab); 2136 2137 kmem_cache_destroy(prot->twsk_prot->twsk_slab); 2138 kfree(name); 2139 prot->twsk_prot->twsk_slab = NULL; 2140 } 2141} 2142 2143EXPORT_SYMBOL(proto_unregister); 2144 2145#ifdef CONFIG_PROC_FS 2146static void *proto_seq_start(struct seq_file *seq, loff_t *pos) 2147 __acquires(proto_list_lock) 2148{ 2149 read_lock(&proto_list_lock); 2150 return seq_list_start_head(&proto_list, *pos); 2151} 2152 2153static void *proto_seq_next(struct seq_file *seq, void *v, loff_t *pos) 2154{ 2155 return seq_list_next(v, &proto_list, pos); 2156} 2157 2158static void proto_seq_stop(struct seq_file *seq, void *v) 2159 __releases(proto_list_lock) 2160{ 2161 read_unlock(&proto_list_lock); 2162} 2163 2164static char proto_method_implemented(const void *method) 2165{ 2166 return method == NULL ? 'n' : 'y'; 2167} 2168 2169static void proto_seq_printf(struct seq_file *seq, struct proto *proto) 2170{ 2171 seq_printf(seq, "%-9s %4u %6d %6d %-3s %6u %-3s %-10s " 2172 "%2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c\n", 2173 proto->name, 2174 proto->obj_size, 2175 proto->sockets_allocated != NULL ? atomic_read(proto->sockets_allocated) : -1, 2176 proto->memory_allocated != NULL ? atomic_read(proto->memory_allocated) : -1, 2177 proto->memory_pressure != NULL ? *proto->memory_pressure ? "yes" : "no" : "NI", 2178 proto->max_header, 2179 proto->slab == NULL ? "no" : "yes", 2180 module_name(proto->owner), 2181 proto_method_implemented(proto->close), 2182 proto_method_implemented(proto->connect), 2183 proto_method_implemented(proto->disconnect), 2184 proto_method_implemented(proto->accept), 2185 proto_method_implemented(proto->ioctl), 2186 proto_method_implemented(proto->init), 2187 proto_method_implemented(proto->destroy), 2188 proto_method_implemented(proto->shutdown), 2189 proto_method_implemented(proto->setsockopt), 2190 proto_method_implemented(proto->getsockopt), 2191 proto_method_implemented(proto->sendmsg), 2192 proto_method_implemented(proto->recvmsg), 2193 proto_method_implemented(proto->sendpage), 2194 proto_method_implemented(proto->bind), 2195 proto_method_implemented(proto->backlog_rcv), 2196 proto_method_implemented(proto->hash), 2197 proto_method_implemented(proto->unhash), 2198 proto_method_implemented(proto->get_port), 2199 proto_method_implemented(proto->enter_memory_pressure)); 2200} 2201 2202static int proto_seq_show(struct seq_file *seq, void *v) 2203{ 2204 if (v == &proto_list) 2205 seq_printf(seq, "%-9s %-4s %-8s %-6s %-5s %-7s %-4s %-10s %s", 2206 "protocol", 2207 "size", 2208 "sockets", 2209 "memory", 2210 "press", 2211 "maxhdr", 2212 "slab", 2213 "module", 2214 "cl co di ac io in de sh ss gs se re sp bi br ha uh gp em\n"); 2215 else 2216 proto_seq_printf(seq, list_entry(v, struct proto, node)); 2217 return 0; 2218} 2219 2220static const struct seq_operations proto_seq_ops = { 2221 .start = proto_seq_start, 2222 .next = proto_seq_next, 2223 .stop = proto_seq_stop, 2224 .show = proto_seq_show, 2225}; 2226 2227static int proto_seq_open(struct inode *inode, struct file *file) 2228{ 2229 return seq_open(file, &proto_seq_ops); 2230} 2231 2232static const struct file_operations proto_seq_fops = { 2233 .owner = THIS_MODULE, 2234 .open = proto_seq_open, 2235 .read = seq_read, 2236 .llseek = seq_lseek, 2237 .release = seq_release, 2238}; 2239 2240static int __init proto_init(void) 2241{ 2242 /* register /proc/net/protocols */ 2243 return proc_net_fops_create(&init_net, "protocols", S_IRUGO, &proto_seq_fops) == NULL ? -ENOBUFS : 0; 2244} 2245 2246subsys_initcall(proto_init); 2247 2248#endif /* PROC_FS */ 2249 2250EXPORT_SYMBOL(sk_alloc); 2251EXPORT_SYMBOL(sk_free); 2252EXPORT_SYMBOL(sk_send_sigurg); 2253EXPORT_SYMBOL(sock_alloc_send_skb); 2254EXPORT_SYMBOL(sock_init_data); 2255EXPORT_SYMBOL(sock_kfree_s); 2256EXPORT_SYMBOL(sock_kmalloc); 2257EXPORT_SYMBOL(sock_no_accept); 2258EXPORT_SYMBOL(sock_no_bind); 2259EXPORT_SYMBOL(sock_no_connect); 2260EXPORT_SYMBOL(sock_no_getname); 2261EXPORT_SYMBOL(sock_no_getsockopt); 2262EXPORT_SYMBOL(sock_no_ioctl); 2263EXPORT_SYMBOL(sock_no_listen); 2264EXPORT_SYMBOL(sock_no_mmap); 2265EXPORT_SYMBOL(sock_no_poll); 2266EXPORT_SYMBOL(sock_no_recvmsg); 2267EXPORT_SYMBOL(sock_no_sendmsg); 2268EXPORT_SYMBOL(sock_no_sendpage); 2269EXPORT_SYMBOL(sock_no_setsockopt); 2270EXPORT_SYMBOL(sock_no_shutdown); 2271EXPORT_SYMBOL(sock_no_socketpair); 2272EXPORT_SYMBOL(sock_rfree); 2273EXPORT_SYMBOL(sock_setsockopt); 2274EXPORT_SYMBOL(sock_wfree); 2275EXPORT_SYMBOL(sock_wmalloc); 2276EXPORT_SYMBOL(sock_i_uid); 2277EXPORT_SYMBOL(sock_i_ino); 2278EXPORT_SYMBOL(sysctl_optmem_max); 2279