sock.c revision 8286274284e15b11b0f531b6ceeef21fbe00a8dd
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 * Authors: Ross Biro 11 * Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG> 12 * Florian La Roche, <flla@stud.uni-sb.de> 13 * Alan Cox, <A.Cox@swansea.ac.uk> 14 * 15 * Fixes: 16 * Alan Cox : Numerous verify_area() problems 17 * Alan Cox : Connecting on a connecting socket 18 * now returns an error for tcp. 19 * Alan Cox : sock->protocol is set correctly. 20 * and is not sometimes left as 0. 21 * Alan Cox : connect handles icmp errors on a 22 * connect properly. Unfortunately there 23 * is a restart syscall nasty there. I 24 * can't match BSD without hacking the C 25 * library. Ideas urgently sought! 26 * Alan Cox : Disallow bind() to addresses that are 27 * not ours - especially broadcast ones!! 28 * Alan Cox : Socket 1024 _IS_ ok for users. (fencepost) 29 * Alan Cox : sock_wfree/sock_rfree don't destroy sockets, 30 * instead they leave that for the DESTROY timer. 31 * Alan Cox : Clean up error flag in accept 32 * Alan Cox : TCP ack handling is buggy, the DESTROY timer 33 * was buggy. Put a remove_sock() in the handler 34 * for memory when we hit 0. Also altered the timer 35 * code. The ACK stuff can wait and needs major 36 * TCP layer surgery. 37 * Alan Cox : Fixed TCP ack bug, removed remove sock 38 * and fixed timer/inet_bh race. 39 * Alan Cox : Added zapped flag for TCP 40 * Alan Cox : Move kfree_skb into skbuff.c and tidied up surplus code 41 * Alan Cox : for new sk_buff allocations wmalloc/rmalloc now call alloc_skb 42 * Alan Cox : kfree_s calls now are kfree_skbmem so we can track skb resources 43 * Alan Cox : Supports socket option broadcast now as does udp. Packet and raw need fixing. 44 * Alan Cox : Added RCVBUF,SNDBUF size setting. It suddenly occurred to me how easy it was so... 45 * Rick Sladkey : Relaxed UDP rules for matching packets. 46 * C.E.Hawkins : IFF_PROMISC/SIOCGHWADDR support 47 * Pauline Middelink : identd support 48 * Alan Cox : Fixed connect() taking signals I think. 49 * Alan Cox : SO_LINGER supported 50 * Alan Cox : Error reporting fixes 51 * Anonymous : inet_create tidied up (sk->reuse setting) 52 * Alan Cox : inet sockets don't set sk->type! 53 * Alan Cox : Split socket option code 54 * Alan Cox : Callbacks 55 * Alan Cox : Nagle flag for Charles & Johannes stuff 56 * Alex : Removed restriction on inet fioctl 57 * Alan Cox : Splitting INET from NET core 58 * Alan Cox : Fixed bogus SO_TYPE handling in getsockopt() 59 * Adam Caldwell : Missing return in SO_DONTROUTE/SO_DEBUG code 60 * Alan Cox : Split IP from generic code 61 * Alan Cox : New kfree_skbmem() 62 * Alan Cox : Make SO_DEBUG superuser only. 63 * Alan Cox : Allow anyone to clear SO_DEBUG 64 * (compatibility fix) 65 * Alan Cox : Added optimistic memory grabbing for AF_UNIX throughput. 66 * Alan Cox : Allocator for a socket is settable. 67 * Alan Cox : SO_ERROR includes soft errors. 68 * Alan Cox : Allow NULL arguments on some SO_ opts 69 * Alan Cox : Generic socket allocation to make hooks 70 * easier (suggested by Craig Metz). 71 * Michael Pall : SO_ERROR returns positive errno again 72 * Steve Whitehouse: Added default destructor to free 73 * protocol private data. 74 * Steve Whitehouse: Added various other default routines 75 * common to several socket families. 76 * Chris Evans : Call suser() check last on F_SETOWN 77 * Jay Schulist : Added SO_ATTACH_FILTER and SO_DETACH_FILTER. 78 * Andi Kleen : Add sock_kmalloc()/sock_kfree_s() 79 * Andi Kleen : Fix write_space callback 80 * Chris Evans : Security fixes - signedness again 81 * Arnaldo C. Melo : cleanups, use skb_queue_purge 82 * 83 * To Fix: 84 * 85 * 86 * This program is free software; you can redistribute it and/or 87 * modify it under the terms of the GNU General Public License 88 * as published by the Free Software Foundation; either version 89 * 2 of the License, or (at your option) any later version. 90 */ 91 92#include <linux/capability.h> 93#include <linux/errno.h> 94#include <linux/types.h> 95#include <linux/socket.h> 96#include <linux/in.h> 97#include <linux/kernel.h> 98#include <linux/module.h> 99#include <linux/proc_fs.h> 100#include <linux/seq_file.h> 101#include <linux/sched.h> 102#include <linux/timer.h> 103#include <linux/string.h> 104#include <linux/sockios.h> 105#include <linux/net.h> 106#include <linux/mm.h> 107#include <linux/slab.h> 108#include <linux/interrupt.h> 109#include <linux/poll.h> 110#include <linux/tcp.h> 111#include <linux/init.h> 112#include <linux/highmem.h> 113 114#include <asm/uaccess.h> 115#include <asm/system.h> 116 117#include <linux/netdevice.h> 118#include <net/protocol.h> 119#include <linux/skbuff.h> 120#include <net/net_namespace.h> 121#include <net/request_sock.h> 122#include <net/sock.h> 123#include <linux/net_tstamp.h> 124#include <net/xfrm.h> 125#include <linux/ipsec.h> 126#include <net/cls_cgroup.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/* 142 * Make lock validator output more readable. (we pre-construct these 143 * strings build-time, so that runtime initialization of socket 144 * locks is fast): 145 */ 146static const char *const af_family_key_strings[AF_MAX+1] = { 147 "sk_lock-AF_UNSPEC", "sk_lock-AF_UNIX" , "sk_lock-AF_INET" , 148 "sk_lock-AF_AX25" , "sk_lock-AF_IPX" , "sk_lock-AF_APPLETALK", 149 "sk_lock-AF_NETROM", "sk_lock-AF_BRIDGE" , "sk_lock-AF_ATMPVC" , 150 "sk_lock-AF_X25" , "sk_lock-AF_INET6" , "sk_lock-AF_ROSE" , 151 "sk_lock-AF_DECnet", "sk_lock-AF_NETBEUI" , "sk_lock-AF_SECURITY" , 152 "sk_lock-AF_KEY" , "sk_lock-AF_NETLINK" , "sk_lock-AF_PACKET" , 153 "sk_lock-AF_ASH" , "sk_lock-AF_ECONET" , "sk_lock-AF_ATMSVC" , 154 "sk_lock-AF_RDS" , "sk_lock-AF_SNA" , "sk_lock-AF_IRDA" , 155 "sk_lock-AF_PPPOX" , "sk_lock-AF_WANPIPE" , "sk_lock-AF_LLC" , 156 "sk_lock-27" , "sk_lock-28" , "sk_lock-AF_CAN" , 157 "sk_lock-AF_TIPC" , "sk_lock-AF_BLUETOOTH", "sk_lock-IUCV" , 158 "sk_lock-AF_RXRPC" , "sk_lock-AF_ISDN" , "sk_lock-AF_PHONET" , 159 "sk_lock-AF_IEEE802154", 160 "sk_lock-AF_MAX" 161}; 162static const char *const af_family_slock_key_strings[AF_MAX+1] = { 163 "slock-AF_UNSPEC", "slock-AF_UNIX" , "slock-AF_INET" , 164 "slock-AF_AX25" , "slock-AF_IPX" , "slock-AF_APPLETALK", 165 "slock-AF_NETROM", "slock-AF_BRIDGE" , "slock-AF_ATMPVC" , 166 "slock-AF_X25" , "slock-AF_INET6" , "slock-AF_ROSE" , 167 "slock-AF_DECnet", "slock-AF_NETBEUI" , "slock-AF_SECURITY" , 168 "slock-AF_KEY" , "slock-AF_NETLINK" , "slock-AF_PACKET" , 169 "slock-AF_ASH" , "slock-AF_ECONET" , "slock-AF_ATMSVC" , 170 "slock-AF_RDS" , "slock-AF_SNA" , "slock-AF_IRDA" , 171 "slock-AF_PPPOX" , "slock-AF_WANPIPE" , "slock-AF_LLC" , 172 "slock-27" , "slock-28" , "slock-AF_CAN" , 173 "slock-AF_TIPC" , "slock-AF_BLUETOOTH", "slock-AF_IUCV" , 174 "slock-AF_RXRPC" , "slock-AF_ISDN" , "slock-AF_PHONET" , 175 "slock-AF_IEEE802154", 176 "slock-AF_MAX" 177}; 178static const char *const af_family_clock_key_strings[AF_MAX+1] = { 179 "clock-AF_UNSPEC", "clock-AF_UNIX" , "clock-AF_INET" , 180 "clock-AF_AX25" , "clock-AF_IPX" , "clock-AF_APPLETALK", 181 "clock-AF_NETROM", "clock-AF_BRIDGE" , "clock-AF_ATMPVC" , 182 "clock-AF_X25" , "clock-AF_INET6" , "clock-AF_ROSE" , 183 "clock-AF_DECnet", "clock-AF_NETBEUI" , "clock-AF_SECURITY" , 184 "clock-AF_KEY" , "clock-AF_NETLINK" , "clock-AF_PACKET" , 185 "clock-AF_ASH" , "clock-AF_ECONET" , "clock-AF_ATMSVC" , 186 "clock-AF_RDS" , "clock-AF_SNA" , "clock-AF_IRDA" , 187 "clock-AF_PPPOX" , "clock-AF_WANPIPE" , "clock-AF_LLC" , 188 "clock-27" , "clock-28" , "clock-AF_CAN" , 189 "clock-AF_TIPC" , "clock-AF_BLUETOOTH", "clock-AF_IUCV" , 190 "clock-AF_RXRPC" , "clock-AF_ISDN" , "clock-AF_PHONET" , 191 "clock-AF_IEEE802154", 192 "clock-AF_MAX" 193}; 194 195/* 196 * sk_callback_lock locking rules are per-address-family, 197 * so split the lock classes by using a per-AF key: 198 */ 199static struct lock_class_key af_callback_keys[AF_MAX]; 200 201/* Take into consideration the size of the struct sk_buff overhead in the 202 * determination of these values, since that is non-constant across 203 * platforms. This makes socket queueing behavior and performance 204 * not depend upon such differences. 205 */ 206#define _SK_MEM_PACKETS 256 207#define _SK_MEM_OVERHEAD (sizeof(struct sk_buff) + 256) 208#define SK_WMEM_MAX (_SK_MEM_OVERHEAD * _SK_MEM_PACKETS) 209#define SK_RMEM_MAX (_SK_MEM_OVERHEAD * _SK_MEM_PACKETS) 210 211/* Run time adjustable parameters. */ 212__u32 sysctl_wmem_max __read_mostly = SK_WMEM_MAX; 213__u32 sysctl_rmem_max __read_mostly = SK_RMEM_MAX; 214__u32 sysctl_wmem_default __read_mostly = SK_WMEM_MAX; 215__u32 sysctl_rmem_default __read_mostly = SK_RMEM_MAX; 216 217/* Maximal space eaten by iovec or ancilliary data plus some space */ 218int sysctl_optmem_max __read_mostly = sizeof(unsigned long)*(2*UIO_MAXIOV+512); 219EXPORT_SYMBOL(sysctl_optmem_max); 220 221#if defined(CONFIG_CGROUPS) && !defined(CONFIG_NET_CLS_CGROUP) 222int net_cls_subsys_id = -1; 223EXPORT_SYMBOL_GPL(net_cls_subsys_id); 224#endif 225 226static int sock_set_timeout(long *timeo_p, char __user *optval, int optlen) 227{ 228 struct timeval tv; 229 230 if (optlen < sizeof(tv)) 231 return -EINVAL; 232 if (copy_from_user(&tv, optval, sizeof(tv))) 233 return -EFAULT; 234 if (tv.tv_usec < 0 || tv.tv_usec >= USEC_PER_SEC) 235 return -EDOM; 236 237 if (tv.tv_sec < 0) { 238 static int warned __read_mostly; 239 240 *timeo_p = 0; 241 if (warned < 10 && net_ratelimit()) { 242 warned++; 243 printk(KERN_INFO "sock_set_timeout: `%s' (pid %d) " 244 "tries to set negative timeout\n", 245 current->comm, task_pid_nr(current)); 246 } 247 return 0; 248 } 249 *timeo_p = MAX_SCHEDULE_TIMEOUT; 250 if (tv.tv_sec == 0 && tv.tv_usec == 0) 251 return 0; 252 if (tv.tv_sec < (MAX_SCHEDULE_TIMEOUT/HZ - 1)) 253 *timeo_p = tv.tv_sec*HZ + (tv.tv_usec+(1000000/HZ-1))/(1000000/HZ); 254 return 0; 255} 256 257static void sock_warn_obsolete_bsdism(const char *name) 258{ 259 static int warned; 260 static char warncomm[TASK_COMM_LEN]; 261 if (strcmp(warncomm, current->comm) && warned < 5) { 262 strcpy(warncomm, current->comm); 263 printk(KERN_WARNING "process `%s' is using obsolete " 264 "%s SO_BSDCOMPAT\n", warncomm, name); 265 warned++; 266 } 267} 268 269static void sock_disable_timestamp(struct sock *sk, int flag) 270{ 271 if (sock_flag(sk, flag)) { 272 sock_reset_flag(sk, flag); 273 if (!sock_flag(sk, SOCK_TIMESTAMP) && 274 !sock_flag(sk, SOCK_TIMESTAMPING_RX_SOFTWARE)) { 275 net_disable_timestamp(); 276 } 277 } 278} 279 280 281int sock_queue_rcv_skb(struct sock *sk, struct sk_buff *skb) 282{ 283 int err; 284 int skb_len; 285 unsigned long flags; 286 struct sk_buff_head *list = &sk->sk_receive_queue; 287 288 /* Cast sk->rcvbuf to unsigned... It's pointless, but reduces 289 number of warnings when compiling with -W --ANK 290 */ 291 if (atomic_read(&sk->sk_rmem_alloc) + skb->truesize >= 292 (unsigned)sk->sk_rcvbuf) { 293 atomic_inc(&sk->sk_drops); 294 return -ENOMEM; 295 } 296 297 err = sk_filter(sk, skb); 298 if (err) 299 return err; 300 301 if (!sk_rmem_schedule(sk, skb->truesize)) { 302 atomic_inc(&sk->sk_drops); 303 return -ENOBUFS; 304 } 305 306 skb->dev = NULL; 307 skb_set_owner_r(skb, sk); 308 309 /* Cache the SKB length before we tack it onto the receive 310 * queue. Once it is added it no longer belongs to us and 311 * may be freed by other threads of control pulling packets 312 * from the queue. 313 */ 314 skb_len = skb->len; 315 316 /* we escape from rcu protected region, make sure we dont leak 317 * a norefcounted dst 318 */ 319 skb_dst_force(skb); 320 321 spin_lock_irqsave(&list->lock, flags); 322 skb->dropcount = atomic_read(&sk->sk_drops); 323 __skb_queue_tail(list, skb); 324 spin_unlock_irqrestore(&list->lock, flags); 325 326 if (!sock_flag(sk, SOCK_DEAD)) 327 sk->sk_data_ready(sk, skb_len); 328 return 0; 329} 330EXPORT_SYMBOL(sock_queue_rcv_skb); 331 332int sk_receive_skb(struct sock *sk, struct sk_buff *skb, const int nested) 333{ 334 int rc = NET_RX_SUCCESS; 335 336 if (sk_filter(sk, skb)) 337 goto discard_and_relse; 338 339 skb->dev = NULL; 340 341 if (sk_rcvqueues_full(sk, skb)) { 342 atomic_inc(&sk->sk_drops); 343 goto discard_and_relse; 344 } 345 if (nested) 346 bh_lock_sock_nested(sk); 347 else 348 bh_lock_sock(sk); 349 if (!sock_owned_by_user(sk)) { 350 /* 351 * trylock + unlock semantics: 352 */ 353 mutex_acquire(&sk->sk_lock.dep_map, 0, 1, _RET_IP_); 354 355 rc = sk_backlog_rcv(sk, skb); 356 357 mutex_release(&sk->sk_lock.dep_map, 1, _RET_IP_); 358 } else if (sk_add_backlog(sk, skb)) { 359 bh_unlock_sock(sk); 360 atomic_inc(&sk->sk_drops); 361 goto discard_and_relse; 362 } 363 364 bh_unlock_sock(sk); 365out: 366 sock_put(sk); 367 return rc; 368discard_and_relse: 369 kfree_skb(skb); 370 goto out; 371} 372EXPORT_SYMBOL(sk_receive_skb); 373 374void sk_reset_txq(struct sock *sk) 375{ 376 sk_tx_queue_clear(sk); 377} 378EXPORT_SYMBOL(sk_reset_txq); 379 380struct dst_entry *__sk_dst_check(struct sock *sk, u32 cookie) 381{ 382 struct dst_entry *dst = __sk_dst_get(sk); 383 384 if (dst && dst->obsolete && dst->ops->check(dst, cookie) == NULL) { 385 sk_tx_queue_clear(sk); 386 rcu_assign_pointer(sk->sk_dst_cache, NULL); 387 dst_release(dst); 388 return NULL; 389 } 390 391 return dst; 392} 393EXPORT_SYMBOL(__sk_dst_check); 394 395struct dst_entry *sk_dst_check(struct sock *sk, u32 cookie) 396{ 397 struct dst_entry *dst = sk_dst_get(sk); 398 399 if (dst && dst->obsolete && dst->ops->check(dst, cookie) == NULL) { 400 sk_dst_reset(sk); 401 dst_release(dst); 402 return NULL; 403 } 404 405 return dst; 406} 407EXPORT_SYMBOL(sk_dst_check); 408 409static int sock_bindtodevice(struct sock *sk, char __user *optval, int optlen) 410{ 411 int ret = -ENOPROTOOPT; 412#ifdef CONFIG_NETDEVICES 413 struct net *net = sock_net(sk); 414 char devname[IFNAMSIZ]; 415 int index; 416 417 /* Sorry... */ 418 ret = -EPERM; 419 if (!capable(CAP_NET_RAW)) 420 goto out; 421 422 ret = -EINVAL; 423 if (optlen < 0) 424 goto out; 425 426 /* Bind this socket to a particular device like "eth0", 427 * as specified in the passed interface name. If the 428 * name is "" or the option length is zero the socket 429 * is not bound. 430 */ 431 if (optlen > IFNAMSIZ - 1) 432 optlen = IFNAMSIZ - 1; 433 memset(devname, 0, sizeof(devname)); 434 435 ret = -EFAULT; 436 if (copy_from_user(devname, optval, optlen)) 437 goto out; 438 439 index = 0; 440 if (devname[0] != '\0') { 441 struct net_device *dev; 442 443 rcu_read_lock(); 444 dev = dev_get_by_name_rcu(net, devname); 445 if (dev) 446 index = dev->ifindex; 447 rcu_read_unlock(); 448 ret = -ENODEV; 449 if (!dev) 450 goto out; 451 } 452 453 lock_sock(sk); 454 sk->sk_bound_dev_if = index; 455 sk_dst_reset(sk); 456 release_sock(sk); 457 458 ret = 0; 459 460out: 461#endif 462 463 return ret; 464} 465 466static inline void sock_valbool_flag(struct sock *sk, int bit, int valbool) 467{ 468 if (valbool) 469 sock_set_flag(sk, bit); 470 else 471 sock_reset_flag(sk, bit); 472} 473 474/* 475 * This is meant for all protocols to use and covers goings on 476 * at the socket level. Everything here is generic. 477 */ 478 479int sock_setsockopt(struct socket *sock, int level, int optname, 480 char __user *optval, unsigned int optlen) 481{ 482 struct sock *sk = sock->sk; 483 int val; 484 int valbool; 485 struct linger ling; 486 int ret = 0; 487 488 /* 489 * Options without arguments 490 */ 491 492 if (optname == SO_BINDTODEVICE) 493 return sock_bindtodevice(sk, optval, optlen); 494 495 if (optlen < sizeof(int)) 496 return -EINVAL; 497 498 if (get_user(val, (int __user *)optval)) 499 return -EFAULT; 500 501 valbool = val ? 1 : 0; 502 503 lock_sock(sk); 504 505 switch (optname) { 506 case SO_DEBUG: 507 if (val && !capable(CAP_NET_ADMIN)) 508 ret = -EACCES; 509 else 510 sock_valbool_flag(sk, SOCK_DBG, valbool); 511 break; 512 case SO_REUSEADDR: 513 sk->sk_reuse = valbool; 514 break; 515 case SO_TYPE: 516 case SO_PROTOCOL: 517 case SO_DOMAIN: 518 case SO_ERROR: 519 ret = -ENOPROTOOPT; 520 break; 521 case SO_DONTROUTE: 522 sock_valbool_flag(sk, SOCK_LOCALROUTE, valbool); 523 break; 524 case SO_BROADCAST: 525 sock_valbool_flag(sk, SOCK_BROADCAST, valbool); 526 break; 527 case SO_SNDBUF: 528 /* Don't error on this BSD doesn't and if you think 529 about it this is right. Otherwise apps have to 530 play 'guess the biggest size' games. RCVBUF/SNDBUF 531 are treated in BSD as hints */ 532 533 if (val > sysctl_wmem_max) 534 val = sysctl_wmem_max; 535set_sndbuf: 536 sk->sk_userlocks |= SOCK_SNDBUF_LOCK; 537 if ((val * 2) < SOCK_MIN_SNDBUF) 538 sk->sk_sndbuf = SOCK_MIN_SNDBUF; 539 else 540 sk->sk_sndbuf = val * 2; 541 542 /* 543 * Wake up sending tasks if we 544 * upped the value. 545 */ 546 sk->sk_write_space(sk); 547 break; 548 549 case SO_SNDBUFFORCE: 550 if (!capable(CAP_NET_ADMIN)) { 551 ret = -EPERM; 552 break; 553 } 554 goto set_sndbuf; 555 556 case SO_RCVBUF: 557 /* Don't error on this BSD doesn't and if you think 558 about it this is right. Otherwise apps have to 559 play 'guess the biggest size' games. RCVBUF/SNDBUF 560 are treated in BSD as hints */ 561 562 if (val > sysctl_rmem_max) 563 val = sysctl_rmem_max; 564set_rcvbuf: 565 sk->sk_userlocks |= SOCK_RCVBUF_LOCK; 566 /* 567 * We double it on the way in to account for 568 * "struct sk_buff" etc. overhead. Applications 569 * assume that the SO_RCVBUF setting they make will 570 * allow that much actual data to be received on that 571 * socket. 572 * 573 * Applications are unaware that "struct sk_buff" and 574 * other overheads allocate from the receive buffer 575 * during socket buffer allocation. 576 * 577 * And after considering the possible alternatives, 578 * returning the value we actually used in getsockopt 579 * is the most desirable behavior. 580 */ 581 if ((val * 2) < SOCK_MIN_RCVBUF) 582 sk->sk_rcvbuf = SOCK_MIN_RCVBUF; 583 else 584 sk->sk_rcvbuf = val * 2; 585 break; 586 587 case SO_RCVBUFFORCE: 588 if (!capable(CAP_NET_ADMIN)) { 589 ret = -EPERM; 590 break; 591 } 592 goto set_rcvbuf; 593 594 case SO_KEEPALIVE: 595#ifdef CONFIG_INET 596 if (sk->sk_protocol == IPPROTO_TCP) 597 tcp_set_keepalive(sk, valbool); 598#endif 599 sock_valbool_flag(sk, SOCK_KEEPOPEN, valbool); 600 break; 601 602 case SO_OOBINLINE: 603 sock_valbool_flag(sk, SOCK_URGINLINE, valbool); 604 break; 605 606 case SO_NO_CHECK: 607 sk->sk_no_check = valbool; 608 break; 609 610 case SO_PRIORITY: 611 if ((val >= 0 && val <= 6) || capable(CAP_NET_ADMIN)) 612 sk->sk_priority = val; 613 else 614 ret = -EPERM; 615 break; 616 617 case SO_LINGER: 618 if (optlen < sizeof(ling)) { 619 ret = -EINVAL; /* 1003.1g */ 620 break; 621 } 622 if (copy_from_user(&ling, optval, sizeof(ling))) { 623 ret = -EFAULT; 624 break; 625 } 626 if (!ling.l_onoff) 627 sock_reset_flag(sk, SOCK_LINGER); 628 else { 629#if (BITS_PER_LONG == 32) 630 if ((unsigned int)ling.l_linger >= MAX_SCHEDULE_TIMEOUT/HZ) 631 sk->sk_lingertime = MAX_SCHEDULE_TIMEOUT; 632 else 633#endif 634 sk->sk_lingertime = (unsigned int)ling.l_linger * HZ; 635 sock_set_flag(sk, SOCK_LINGER); 636 } 637 break; 638 639 case SO_BSDCOMPAT: 640 sock_warn_obsolete_bsdism("setsockopt"); 641 break; 642 643 case SO_PASSCRED: 644 if (valbool) 645 set_bit(SOCK_PASSCRED, &sock->flags); 646 else 647 clear_bit(SOCK_PASSCRED, &sock->flags); 648 break; 649 650 case SO_TIMESTAMP: 651 case SO_TIMESTAMPNS: 652 if (valbool) { 653 if (optname == SO_TIMESTAMP) 654 sock_reset_flag(sk, SOCK_RCVTSTAMPNS); 655 else 656 sock_set_flag(sk, SOCK_RCVTSTAMPNS); 657 sock_set_flag(sk, SOCK_RCVTSTAMP); 658 sock_enable_timestamp(sk, SOCK_TIMESTAMP); 659 } else { 660 sock_reset_flag(sk, SOCK_RCVTSTAMP); 661 sock_reset_flag(sk, SOCK_RCVTSTAMPNS); 662 } 663 break; 664 665 case SO_TIMESTAMPING: 666 if (val & ~SOF_TIMESTAMPING_MASK) { 667 ret = -EINVAL; 668 break; 669 } 670 sock_valbool_flag(sk, SOCK_TIMESTAMPING_TX_HARDWARE, 671 val & SOF_TIMESTAMPING_TX_HARDWARE); 672 sock_valbool_flag(sk, SOCK_TIMESTAMPING_TX_SOFTWARE, 673 val & SOF_TIMESTAMPING_TX_SOFTWARE); 674 sock_valbool_flag(sk, SOCK_TIMESTAMPING_RX_HARDWARE, 675 val & SOF_TIMESTAMPING_RX_HARDWARE); 676 if (val & SOF_TIMESTAMPING_RX_SOFTWARE) 677 sock_enable_timestamp(sk, 678 SOCK_TIMESTAMPING_RX_SOFTWARE); 679 else 680 sock_disable_timestamp(sk, 681 SOCK_TIMESTAMPING_RX_SOFTWARE); 682 sock_valbool_flag(sk, SOCK_TIMESTAMPING_SOFTWARE, 683 val & SOF_TIMESTAMPING_SOFTWARE); 684 sock_valbool_flag(sk, SOCK_TIMESTAMPING_SYS_HARDWARE, 685 val & SOF_TIMESTAMPING_SYS_HARDWARE); 686 sock_valbool_flag(sk, SOCK_TIMESTAMPING_RAW_HARDWARE, 687 val & SOF_TIMESTAMPING_RAW_HARDWARE); 688 break; 689 690 case SO_RCVLOWAT: 691 if (val < 0) 692 val = INT_MAX; 693 sk->sk_rcvlowat = val ? : 1; 694 break; 695 696 case SO_RCVTIMEO: 697 ret = sock_set_timeout(&sk->sk_rcvtimeo, optval, optlen); 698 break; 699 700 case SO_SNDTIMEO: 701 ret = sock_set_timeout(&sk->sk_sndtimeo, optval, optlen); 702 break; 703 704 case SO_ATTACH_FILTER: 705 ret = -EINVAL; 706 if (optlen == sizeof(struct sock_fprog)) { 707 struct sock_fprog fprog; 708 709 ret = -EFAULT; 710 if (copy_from_user(&fprog, optval, sizeof(fprog))) 711 break; 712 713 ret = sk_attach_filter(&fprog, sk); 714 } 715 break; 716 717 case SO_DETACH_FILTER: 718 ret = sk_detach_filter(sk); 719 break; 720 721 case SO_PASSSEC: 722 if (valbool) 723 set_bit(SOCK_PASSSEC, &sock->flags); 724 else 725 clear_bit(SOCK_PASSSEC, &sock->flags); 726 break; 727 case SO_MARK: 728 if (!capable(CAP_NET_ADMIN)) 729 ret = -EPERM; 730 else 731 sk->sk_mark = val; 732 break; 733 734 /* We implement the SO_SNDLOWAT etc to 735 not be settable (1003.1g 5.3) */ 736 case SO_RXQ_OVFL: 737 if (valbool) 738 sock_set_flag(sk, SOCK_RXQ_OVFL); 739 else 740 sock_reset_flag(sk, SOCK_RXQ_OVFL); 741 break; 742 default: 743 ret = -ENOPROTOOPT; 744 break; 745 } 746 release_sock(sk); 747 return ret; 748} 749EXPORT_SYMBOL(sock_setsockopt); 750 751 752int sock_getsockopt(struct socket *sock, int level, int optname, 753 char __user *optval, int __user *optlen) 754{ 755 struct sock *sk = sock->sk; 756 757 union { 758 int val; 759 struct linger ling; 760 struct timeval tm; 761 } v; 762 763 int lv = sizeof(int); 764 int len; 765 766 if (get_user(len, optlen)) 767 return -EFAULT; 768 if (len < 0) 769 return -EINVAL; 770 771 memset(&v, 0, sizeof(v)); 772 773 switch (optname) { 774 case SO_DEBUG: 775 v.val = sock_flag(sk, SOCK_DBG); 776 break; 777 778 case SO_DONTROUTE: 779 v.val = sock_flag(sk, SOCK_LOCALROUTE); 780 break; 781 782 case SO_BROADCAST: 783 v.val = !!sock_flag(sk, SOCK_BROADCAST); 784 break; 785 786 case SO_SNDBUF: 787 v.val = sk->sk_sndbuf; 788 break; 789 790 case SO_RCVBUF: 791 v.val = sk->sk_rcvbuf; 792 break; 793 794 case SO_REUSEADDR: 795 v.val = sk->sk_reuse; 796 break; 797 798 case SO_KEEPALIVE: 799 v.val = !!sock_flag(sk, SOCK_KEEPOPEN); 800 break; 801 802 case SO_TYPE: 803 v.val = sk->sk_type; 804 break; 805 806 case SO_PROTOCOL: 807 v.val = sk->sk_protocol; 808 break; 809 810 case SO_DOMAIN: 811 v.val = sk->sk_family; 812 break; 813 814 case SO_ERROR: 815 v.val = -sock_error(sk); 816 if (v.val == 0) 817 v.val = xchg(&sk->sk_err_soft, 0); 818 break; 819 820 case SO_OOBINLINE: 821 v.val = !!sock_flag(sk, SOCK_URGINLINE); 822 break; 823 824 case SO_NO_CHECK: 825 v.val = sk->sk_no_check; 826 break; 827 828 case SO_PRIORITY: 829 v.val = sk->sk_priority; 830 break; 831 832 case SO_LINGER: 833 lv = sizeof(v.ling); 834 v.ling.l_onoff = !!sock_flag(sk, SOCK_LINGER); 835 v.ling.l_linger = sk->sk_lingertime / HZ; 836 break; 837 838 case SO_BSDCOMPAT: 839 sock_warn_obsolete_bsdism("getsockopt"); 840 break; 841 842 case SO_TIMESTAMP: 843 v.val = sock_flag(sk, SOCK_RCVTSTAMP) && 844 !sock_flag(sk, SOCK_RCVTSTAMPNS); 845 break; 846 847 case SO_TIMESTAMPNS: 848 v.val = sock_flag(sk, SOCK_RCVTSTAMPNS); 849 break; 850 851 case SO_TIMESTAMPING: 852 v.val = 0; 853 if (sock_flag(sk, SOCK_TIMESTAMPING_TX_HARDWARE)) 854 v.val |= SOF_TIMESTAMPING_TX_HARDWARE; 855 if (sock_flag(sk, SOCK_TIMESTAMPING_TX_SOFTWARE)) 856 v.val |= SOF_TIMESTAMPING_TX_SOFTWARE; 857 if (sock_flag(sk, SOCK_TIMESTAMPING_RX_HARDWARE)) 858 v.val |= SOF_TIMESTAMPING_RX_HARDWARE; 859 if (sock_flag(sk, SOCK_TIMESTAMPING_RX_SOFTWARE)) 860 v.val |= SOF_TIMESTAMPING_RX_SOFTWARE; 861 if (sock_flag(sk, SOCK_TIMESTAMPING_SOFTWARE)) 862 v.val |= SOF_TIMESTAMPING_SOFTWARE; 863 if (sock_flag(sk, SOCK_TIMESTAMPING_SYS_HARDWARE)) 864 v.val |= SOF_TIMESTAMPING_SYS_HARDWARE; 865 if (sock_flag(sk, SOCK_TIMESTAMPING_RAW_HARDWARE)) 866 v.val |= SOF_TIMESTAMPING_RAW_HARDWARE; 867 break; 868 869 case SO_RCVTIMEO: 870 lv = sizeof(struct timeval); 871 if (sk->sk_rcvtimeo == MAX_SCHEDULE_TIMEOUT) { 872 v.tm.tv_sec = 0; 873 v.tm.tv_usec = 0; 874 } else { 875 v.tm.tv_sec = sk->sk_rcvtimeo / HZ; 876 v.tm.tv_usec = ((sk->sk_rcvtimeo % HZ) * 1000000) / HZ; 877 } 878 break; 879 880 case SO_SNDTIMEO: 881 lv = sizeof(struct timeval); 882 if (sk->sk_sndtimeo == MAX_SCHEDULE_TIMEOUT) { 883 v.tm.tv_sec = 0; 884 v.tm.tv_usec = 0; 885 } else { 886 v.tm.tv_sec = sk->sk_sndtimeo / HZ; 887 v.tm.tv_usec = ((sk->sk_sndtimeo % HZ) * 1000000) / HZ; 888 } 889 break; 890 891 case SO_RCVLOWAT: 892 v.val = sk->sk_rcvlowat; 893 break; 894 895 case SO_SNDLOWAT: 896 v.val = 1; 897 break; 898 899 case SO_PASSCRED: 900 v.val = test_bit(SOCK_PASSCRED, &sock->flags) ? 1 : 0; 901 break; 902 903 case SO_PEERCRED: 904 if (len > sizeof(sk->sk_peercred)) 905 len = sizeof(sk->sk_peercred); 906 if (copy_to_user(optval, &sk->sk_peercred, len)) 907 return -EFAULT; 908 goto lenout; 909 910 case SO_PEERNAME: 911 { 912 char address[128]; 913 914 if (sock->ops->getname(sock, (struct sockaddr *)address, &lv, 2)) 915 return -ENOTCONN; 916 if (lv < len) 917 return -EINVAL; 918 if (copy_to_user(optval, address, len)) 919 return -EFAULT; 920 goto lenout; 921 } 922 923 /* Dubious BSD thing... Probably nobody even uses it, but 924 * the UNIX standard wants it for whatever reason... -DaveM 925 */ 926 case SO_ACCEPTCONN: 927 v.val = sk->sk_state == TCP_LISTEN; 928 break; 929 930 case SO_PASSSEC: 931 v.val = test_bit(SOCK_PASSSEC, &sock->flags) ? 1 : 0; 932 break; 933 934 case SO_PEERSEC: 935 return security_socket_getpeersec_stream(sock, optval, optlen, len); 936 937 case SO_MARK: 938 v.val = sk->sk_mark; 939 break; 940 941 case SO_RXQ_OVFL: 942 v.val = !!sock_flag(sk, SOCK_RXQ_OVFL); 943 break; 944 945 default: 946 return -ENOPROTOOPT; 947 } 948 949 if (len > lv) 950 len = lv; 951 if (copy_to_user(optval, &v, len)) 952 return -EFAULT; 953lenout: 954 if (put_user(len, optlen)) 955 return -EFAULT; 956 return 0; 957} 958 959/* 960 * Initialize an sk_lock. 961 * 962 * (We also register the sk_lock with the lock validator.) 963 */ 964static inline void sock_lock_init(struct sock *sk) 965{ 966 sock_lock_init_class_and_name(sk, 967 af_family_slock_key_strings[sk->sk_family], 968 af_family_slock_keys + sk->sk_family, 969 af_family_key_strings[sk->sk_family], 970 af_family_keys + sk->sk_family); 971} 972 973/* 974 * Copy all fields from osk to nsk but nsk->sk_refcnt must not change yet, 975 * even temporarly, because of RCU lookups. sk_node should also be left as is. 976 */ 977static void sock_copy(struct sock *nsk, const struct sock *osk) 978{ 979#ifdef CONFIG_SECURITY_NETWORK 980 void *sptr = nsk->sk_security; 981#endif 982 BUILD_BUG_ON(offsetof(struct sock, sk_copy_start) != 983 sizeof(osk->sk_node) + sizeof(osk->sk_refcnt) + 984 sizeof(osk->sk_tx_queue_mapping)); 985 memcpy(&nsk->sk_copy_start, &osk->sk_copy_start, 986 osk->sk_prot->obj_size - offsetof(struct sock, sk_copy_start)); 987#ifdef CONFIG_SECURITY_NETWORK 988 nsk->sk_security = sptr; 989 security_sk_clone(osk, nsk); 990#endif 991} 992 993static struct sock *sk_prot_alloc(struct proto *prot, gfp_t priority, 994 int family) 995{ 996 struct sock *sk; 997 struct kmem_cache *slab; 998 999 slab = prot->slab; 1000 if (slab != NULL) { 1001 sk = kmem_cache_alloc(slab, priority & ~__GFP_ZERO); 1002 if (!sk) 1003 return sk; 1004 if (priority & __GFP_ZERO) { 1005 /* 1006 * caches using SLAB_DESTROY_BY_RCU should let 1007 * sk_node.next un-modified. Special care is taken 1008 * when initializing object to zero. 1009 */ 1010 if (offsetof(struct sock, sk_node.next) != 0) 1011 memset(sk, 0, offsetof(struct sock, sk_node.next)); 1012 memset(&sk->sk_node.pprev, 0, 1013 prot->obj_size - offsetof(struct sock, 1014 sk_node.pprev)); 1015 } 1016 } 1017 else 1018 sk = kmalloc(prot->obj_size, priority); 1019 1020 if (sk != NULL) { 1021 kmemcheck_annotate_bitfield(sk, flags); 1022 1023 if (security_sk_alloc(sk, family, priority)) 1024 goto out_free; 1025 1026 if (!try_module_get(prot->owner)) 1027 goto out_free_sec; 1028 sk_tx_queue_clear(sk); 1029 } 1030 1031 return sk; 1032 1033out_free_sec: 1034 security_sk_free(sk); 1035out_free: 1036 if (slab != NULL) 1037 kmem_cache_free(slab, sk); 1038 else 1039 kfree(sk); 1040 return NULL; 1041} 1042 1043static void sk_prot_free(struct proto *prot, struct sock *sk) 1044{ 1045 struct kmem_cache *slab; 1046 struct module *owner; 1047 1048 owner = prot->owner; 1049 slab = prot->slab; 1050 1051 security_sk_free(sk); 1052 if (slab != NULL) 1053 kmem_cache_free(slab, sk); 1054 else 1055 kfree(sk); 1056 module_put(owner); 1057} 1058 1059#ifdef CONFIG_CGROUPS 1060void sock_update_classid(struct sock *sk) 1061{ 1062 u32 classid = task_cls_classid(current); 1063 1064 if (classid && classid != sk->sk_classid) 1065 sk->sk_classid = classid; 1066} 1067EXPORT_SYMBOL(sock_update_classid); 1068#endif 1069 1070/** 1071 * sk_alloc - All socket objects are allocated here 1072 * @net: the applicable net namespace 1073 * @family: protocol family 1074 * @priority: for allocation (%GFP_KERNEL, %GFP_ATOMIC, etc) 1075 * @prot: struct proto associated with this new sock instance 1076 */ 1077struct sock *sk_alloc(struct net *net, int family, gfp_t priority, 1078 struct proto *prot) 1079{ 1080 struct sock *sk; 1081 1082 sk = sk_prot_alloc(prot, priority | __GFP_ZERO, family); 1083 if (sk) { 1084 sk->sk_family = family; 1085 /* 1086 * See comment in struct sock definition to understand 1087 * why we need sk_prot_creator -acme 1088 */ 1089 sk->sk_prot = sk->sk_prot_creator = prot; 1090 sock_lock_init(sk); 1091 sock_net_set(sk, get_net(net)); 1092 atomic_set(&sk->sk_wmem_alloc, 1); 1093 1094 sock_update_classid(sk); 1095 } 1096 1097 return sk; 1098} 1099EXPORT_SYMBOL(sk_alloc); 1100 1101static void __sk_free(struct sock *sk) 1102{ 1103 struct sk_filter *filter; 1104 1105 if (sk->sk_destruct) 1106 sk->sk_destruct(sk); 1107 1108 filter = rcu_dereference_check(sk->sk_filter, 1109 atomic_read(&sk->sk_wmem_alloc) == 0); 1110 if (filter) { 1111 sk_filter_uncharge(sk, filter); 1112 rcu_assign_pointer(sk->sk_filter, NULL); 1113 } 1114 1115 sock_disable_timestamp(sk, SOCK_TIMESTAMP); 1116 sock_disable_timestamp(sk, SOCK_TIMESTAMPING_RX_SOFTWARE); 1117 1118 if (atomic_read(&sk->sk_omem_alloc)) 1119 printk(KERN_DEBUG "%s: optmem leakage (%d bytes) detected.\n", 1120 __func__, atomic_read(&sk->sk_omem_alloc)); 1121 1122 put_net(sock_net(sk)); 1123 sk_prot_free(sk->sk_prot_creator, sk); 1124} 1125 1126void sk_free(struct sock *sk) 1127{ 1128 /* 1129 * We substract one from sk_wmem_alloc and can know if 1130 * some packets are still in some tx queue. 1131 * If not null, sock_wfree() will call __sk_free(sk) later 1132 */ 1133 if (atomic_dec_and_test(&sk->sk_wmem_alloc)) 1134 __sk_free(sk); 1135} 1136EXPORT_SYMBOL(sk_free); 1137 1138/* 1139 * Last sock_put should drop referrence to sk->sk_net. It has already 1140 * been dropped in sk_change_net. Taking referrence to stopping namespace 1141 * is not an option. 1142 * Take referrence to a socket to remove it from hash _alive_ and after that 1143 * destroy it in the context of init_net. 1144 */ 1145void sk_release_kernel(struct sock *sk) 1146{ 1147 if (sk == NULL || sk->sk_socket == NULL) 1148 return; 1149 1150 sock_hold(sk); 1151 sock_release(sk->sk_socket); 1152 release_net(sock_net(sk)); 1153 sock_net_set(sk, get_net(&init_net)); 1154 sock_put(sk); 1155} 1156EXPORT_SYMBOL(sk_release_kernel); 1157 1158struct sock *sk_clone(const struct sock *sk, const gfp_t priority) 1159{ 1160 struct sock *newsk; 1161 1162 newsk = sk_prot_alloc(sk->sk_prot, priority, sk->sk_family); 1163 if (newsk != NULL) { 1164 struct sk_filter *filter; 1165 1166 sock_copy(newsk, sk); 1167 1168 /* SANITY */ 1169 get_net(sock_net(newsk)); 1170 sk_node_init(&newsk->sk_node); 1171 sock_lock_init(newsk); 1172 bh_lock_sock(newsk); 1173 newsk->sk_backlog.head = newsk->sk_backlog.tail = NULL; 1174 newsk->sk_backlog.len = 0; 1175 1176 atomic_set(&newsk->sk_rmem_alloc, 0); 1177 /* 1178 * sk_wmem_alloc set to one (see sk_free() and sock_wfree()) 1179 */ 1180 atomic_set(&newsk->sk_wmem_alloc, 1); 1181 atomic_set(&newsk->sk_omem_alloc, 0); 1182 skb_queue_head_init(&newsk->sk_receive_queue); 1183 skb_queue_head_init(&newsk->sk_write_queue); 1184#ifdef CONFIG_NET_DMA 1185 skb_queue_head_init(&newsk->sk_async_wait_queue); 1186#endif 1187 1188 spin_lock_init(&newsk->sk_dst_lock); 1189 rwlock_init(&newsk->sk_callback_lock); 1190 lockdep_set_class_and_name(&newsk->sk_callback_lock, 1191 af_callback_keys + newsk->sk_family, 1192 af_family_clock_key_strings[newsk->sk_family]); 1193 1194 newsk->sk_dst_cache = NULL; 1195 newsk->sk_wmem_queued = 0; 1196 newsk->sk_forward_alloc = 0; 1197 newsk->sk_send_head = NULL; 1198 newsk->sk_userlocks = sk->sk_userlocks & ~SOCK_BINDPORT_LOCK; 1199 1200 sock_reset_flag(newsk, SOCK_DONE); 1201 skb_queue_head_init(&newsk->sk_error_queue); 1202 1203 filter = newsk->sk_filter; 1204 if (filter != NULL) 1205 sk_filter_charge(newsk, filter); 1206 1207 if (unlikely(xfrm_sk_clone_policy(newsk))) { 1208 /* It is still raw copy of parent, so invalidate 1209 * destructor and make plain sk_free() */ 1210 newsk->sk_destruct = NULL; 1211 sk_free(newsk); 1212 newsk = NULL; 1213 goto out; 1214 } 1215 1216 newsk->sk_err = 0; 1217 newsk->sk_priority = 0; 1218 /* 1219 * Before updating sk_refcnt, we must commit prior changes to memory 1220 * (Documentation/RCU/rculist_nulls.txt for details) 1221 */ 1222 smp_wmb(); 1223 atomic_set(&newsk->sk_refcnt, 2); 1224 1225 /* 1226 * Increment the counter in the same struct proto as the master 1227 * sock (sk_refcnt_debug_inc uses newsk->sk_prot->socks, that 1228 * is the same as sk->sk_prot->socks, as this field was copied 1229 * with memcpy). 1230 * 1231 * This _changes_ the previous behaviour, where 1232 * tcp_create_openreq_child always was incrementing the 1233 * equivalent to tcp_prot->socks (inet_sock_nr), so this have 1234 * to be taken into account in all callers. -acme 1235 */ 1236 sk_refcnt_debug_inc(newsk); 1237 sk_set_socket(newsk, NULL); 1238 newsk->sk_wq = NULL; 1239 1240 if (newsk->sk_prot->sockets_allocated) 1241 percpu_counter_inc(newsk->sk_prot->sockets_allocated); 1242 1243 if (sock_flag(newsk, SOCK_TIMESTAMP) || 1244 sock_flag(newsk, SOCK_TIMESTAMPING_RX_SOFTWARE)) 1245 net_enable_timestamp(); 1246 } 1247out: 1248 return newsk; 1249} 1250EXPORT_SYMBOL_GPL(sk_clone); 1251 1252void sk_setup_caps(struct sock *sk, struct dst_entry *dst) 1253{ 1254 __sk_dst_set(sk, dst); 1255 sk->sk_route_caps = dst->dev->features; 1256 if (sk->sk_route_caps & NETIF_F_GSO) 1257 sk->sk_route_caps |= NETIF_F_GSO_SOFTWARE; 1258 sk->sk_route_caps &= ~sk->sk_route_nocaps; 1259 if (sk_can_gso(sk)) { 1260 if (dst->header_len) { 1261 sk->sk_route_caps &= ~NETIF_F_GSO_MASK; 1262 } else { 1263 sk->sk_route_caps |= NETIF_F_SG | NETIF_F_HW_CSUM; 1264 sk->sk_gso_max_size = dst->dev->gso_max_size; 1265 } 1266 } 1267} 1268EXPORT_SYMBOL_GPL(sk_setup_caps); 1269 1270void __init sk_init(void) 1271{ 1272 if (totalram_pages <= 4096) { 1273 sysctl_wmem_max = 32767; 1274 sysctl_rmem_max = 32767; 1275 sysctl_wmem_default = 32767; 1276 sysctl_rmem_default = 32767; 1277 } else if (totalram_pages >= 131072) { 1278 sysctl_wmem_max = 131071; 1279 sysctl_rmem_max = 131071; 1280 } 1281} 1282 1283/* 1284 * Simple resource managers for sockets. 1285 */ 1286 1287 1288/* 1289 * Write buffer destructor automatically called from kfree_skb. 1290 */ 1291void sock_wfree(struct sk_buff *skb) 1292{ 1293 struct sock *sk = skb->sk; 1294 unsigned int len = skb->truesize; 1295 1296 if (!sock_flag(sk, SOCK_USE_WRITE_QUEUE)) { 1297 /* 1298 * Keep a reference on sk_wmem_alloc, this will be released 1299 * after sk_write_space() call 1300 */ 1301 atomic_sub(len - 1, &sk->sk_wmem_alloc); 1302 sk->sk_write_space(sk); 1303 len = 1; 1304 } 1305 /* 1306 * if sk_wmem_alloc reaches 0, we must finish what sk_free() 1307 * could not do because of in-flight packets 1308 */ 1309 if (atomic_sub_and_test(len, &sk->sk_wmem_alloc)) 1310 __sk_free(sk); 1311} 1312EXPORT_SYMBOL(sock_wfree); 1313 1314/* 1315 * Read buffer destructor automatically called from kfree_skb. 1316 */ 1317void sock_rfree(struct sk_buff *skb) 1318{ 1319 struct sock *sk = skb->sk; 1320 1321 atomic_sub(skb->truesize, &sk->sk_rmem_alloc); 1322 sk_mem_uncharge(skb->sk, skb->truesize); 1323} 1324EXPORT_SYMBOL(sock_rfree); 1325 1326 1327int sock_i_uid(struct sock *sk) 1328{ 1329 int uid; 1330 1331 read_lock(&sk->sk_callback_lock); 1332 uid = sk->sk_socket ? SOCK_INODE(sk->sk_socket)->i_uid : 0; 1333 read_unlock(&sk->sk_callback_lock); 1334 return uid; 1335} 1336EXPORT_SYMBOL(sock_i_uid); 1337 1338unsigned long sock_i_ino(struct sock *sk) 1339{ 1340 unsigned long ino; 1341 1342 read_lock(&sk->sk_callback_lock); 1343 ino = sk->sk_socket ? SOCK_INODE(sk->sk_socket)->i_ino : 0; 1344 read_unlock(&sk->sk_callback_lock); 1345 return ino; 1346} 1347EXPORT_SYMBOL(sock_i_ino); 1348 1349/* 1350 * Allocate a skb from the socket's send buffer. 1351 */ 1352struct sk_buff *sock_wmalloc(struct sock *sk, unsigned long size, int force, 1353 gfp_t priority) 1354{ 1355 if (force || atomic_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf) { 1356 struct sk_buff *skb = alloc_skb(size, priority); 1357 if (skb) { 1358 skb_set_owner_w(skb, sk); 1359 return skb; 1360 } 1361 } 1362 return NULL; 1363} 1364EXPORT_SYMBOL(sock_wmalloc); 1365 1366/* 1367 * Allocate a skb from the socket's receive buffer. 1368 */ 1369struct sk_buff *sock_rmalloc(struct sock *sk, unsigned long size, int force, 1370 gfp_t priority) 1371{ 1372 if (force || atomic_read(&sk->sk_rmem_alloc) < sk->sk_rcvbuf) { 1373 struct sk_buff *skb = alloc_skb(size, priority); 1374 if (skb) { 1375 skb_set_owner_r(skb, sk); 1376 return skb; 1377 } 1378 } 1379 return NULL; 1380} 1381 1382/* 1383 * Allocate a memory block from the socket's option memory buffer. 1384 */ 1385void *sock_kmalloc(struct sock *sk, int size, gfp_t priority) 1386{ 1387 if ((unsigned)size <= sysctl_optmem_max && 1388 atomic_read(&sk->sk_omem_alloc) + size < sysctl_optmem_max) { 1389 void *mem; 1390 /* First do the add, to avoid the race if kmalloc 1391 * might sleep. 1392 */ 1393 atomic_add(size, &sk->sk_omem_alloc); 1394 mem = kmalloc(size, priority); 1395 if (mem) 1396 return mem; 1397 atomic_sub(size, &sk->sk_omem_alloc); 1398 } 1399 return NULL; 1400} 1401EXPORT_SYMBOL(sock_kmalloc); 1402 1403/* 1404 * Free an option memory block. 1405 */ 1406void sock_kfree_s(struct sock *sk, void *mem, int size) 1407{ 1408 kfree(mem); 1409 atomic_sub(size, &sk->sk_omem_alloc); 1410} 1411EXPORT_SYMBOL(sock_kfree_s); 1412 1413/* It is almost wait_for_tcp_memory minus release_sock/lock_sock. 1414 I think, these locks should be removed for datagram sockets. 1415 */ 1416static long sock_wait_for_wmem(struct sock *sk, long timeo) 1417{ 1418 DEFINE_WAIT(wait); 1419 1420 clear_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags); 1421 for (;;) { 1422 if (!timeo) 1423 break; 1424 if (signal_pending(current)) 1425 break; 1426 set_bit(SOCK_NOSPACE, &sk->sk_socket->flags); 1427 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE); 1428 if (atomic_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf) 1429 break; 1430 if (sk->sk_shutdown & SEND_SHUTDOWN) 1431 break; 1432 if (sk->sk_err) 1433 break; 1434 timeo = schedule_timeout(timeo); 1435 } 1436 finish_wait(sk_sleep(sk), &wait); 1437 return timeo; 1438} 1439 1440 1441/* 1442 * Generic send/receive buffer handlers 1443 */ 1444 1445struct sk_buff *sock_alloc_send_pskb(struct sock *sk, unsigned long header_len, 1446 unsigned long data_len, int noblock, 1447 int *errcode) 1448{ 1449 struct sk_buff *skb; 1450 gfp_t gfp_mask; 1451 long timeo; 1452 int err; 1453 1454 gfp_mask = sk->sk_allocation; 1455 if (gfp_mask & __GFP_WAIT) 1456 gfp_mask |= __GFP_REPEAT; 1457 1458 timeo = sock_sndtimeo(sk, noblock); 1459 while (1) { 1460 err = sock_error(sk); 1461 if (err != 0) 1462 goto failure; 1463 1464 err = -EPIPE; 1465 if (sk->sk_shutdown & SEND_SHUTDOWN) 1466 goto failure; 1467 1468 if (atomic_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf) { 1469 skb = alloc_skb(header_len, gfp_mask); 1470 if (skb) { 1471 int npages; 1472 int i; 1473 1474 /* No pages, we're done... */ 1475 if (!data_len) 1476 break; 1477 1478 npages = (data_len + (PAGE_SIZE - 1)) >> PAGE_SHIFT; 1479 skb->truesize += data_len; 1480 skb_shinfo(skb)->nr_frags = npages; 1481 for (i = 0; i < npages; i++) { 1482 struct page *page; 1483 skb_frag_t *frag; 1484 1485 page = alloc_pages(sk->sk_allocation, 0); 1486 if (!page) { 1487 err = -ENOBUFS; 1488 skb_shinfo(skb)->nr_frags = i; 1489 kfree_skb(skb); 1490 goto failure; 1491 } 1492 1493 frag = &skb_shinfo(skb)->frags[i]; 1494 frag->page = page; 1495 frag->page_offset = 0; 1496 frag->size = (data_len >= PAGE_SIZE ? 1497 PAGE_SIZE : 1498 data_len); 1499 data_len -= PAGE_SIZE; 1500 } 1501 1502 /* Full success... */ 1503 break; 1504 } 1505 err = -ENOBUFS; 1506 goto failure; 1507 } 1508 set_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags); 1509 set_bit(SOCK_NOSPACE, &sk->sk_socket->flags); 1510 err = -EAGAIN; 1511 if (!timeo) 1512 goto failure; 1513 if (signal_pending(current)) 1514 goto interrupted; 1515 timeo = sock_wait_for_wmem(sk, timeo); 1516 } 1517 1518 skb_set_owner_w(skb, sk); 1519 return skb; 1520 1521interrupted: 1522 err = sock_intr_errno(timeo); 1523failure: 1524 *errcode = err; 1525 return NULL; 1526} 1527EXPORT_SYMBOL(sock_alloc_send_pskb); 1528 1529struct sk_buff *sock_alloc_send_skb(struct sock *sk, unsigned long size, 1530 int noblock, int *errcode) 1531{ 1532 return sock_alloc_send_pskb(sk, size, 0, noblock, errcode); 1533} 1534EXPORT_SYMBOL(sock_alloc_send_skb); 1535 1536static void __lock_sock(struct sock *sk) 1537{ 1538 DEFINE_WAIT(wait); 1539 1540 for (;;) { 1541 prepare_to_wait_exclusive(&sk->sk_lock.wq, &wait, 1542 TASK_UNINTERRUPTIBLE); 1543 spin_unlock_bh(&sk->sk_lock.slock); 1544 schedule(); 1545 spin_lock_bh(&sk->sk_lock.slock); 1546 if (!sock_owned_by_user(sk)) 1547 break; 1548 } 1549 finish_wait(&sk->sk_lock.wq, &wait); 1550} 1551 1552static void __release_sock(struct sock *sk) 1553{ 1554 struct sk_buff *skb = sk->sk_backlog.head; 1555 1556 do { 1557 sk->sk_backlog.head = sk->sk_backlog.tail = NULL; 1558 bh_unlock_sock(sk); 1559 1560 do { 1561 struct sk_buff *next = skb->next; 1562 1563 WARN_ON_ONCE(skb_dst_is_noref(skb)); 1564 skb->next = NULL; 1565 sk_backlog_rcv(sk, skb); 1566 1567 /* 1568 * We are in process context here with softirqs 1569 * disabled, use cond_resched_softirq() to preempt. 1570 * This is safe to do because we've taken the backlog 1571 * queue private: 1572 */ 1573 cond_resched_softirq(); 1574 1575 skb = next; 1576 } while (skb != NULL); 1577 1578 bh_lock_sock(sk); 1579 } while ((skb = sk->sk_backlog.head) != NULL); 1580 1581 /* 1582 * Doing the zeroing here guarantee we can not loop forever 1583 * while a wild producer attempts to flood us. 1584 */ 1585 sk->sk_backlog.len = 0; 1586} 1587 1588/** 1589 * sk_wait_data - wait for data to arrive at sk_receive_queue 1590 * @sk: sock to wait on 1591 * @timeo: for how long 1592 * 1593 * Now socket state including sk->sk_err is changed only under lock, 1594 * hence we may omit checks after joining wait queue. 1595 * We check receive queue before schedule() only as optimization; 1596 * it is very likely that release_sock() added new data. 1597 */ 1598int sk_wait_data(struct sock *sk, long *timeo) 1599{ 1600 int rc; 1601 DEFINE_WAIT(wait); 1602 1603 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE); 1604 set_bit(SOCK_ASYNC_WAITDATA, &sk->sk_socket->flags); 1605 rc = sk_wait_event(sk, timeo, !skb_queue_empty(&sk->sk_receive_queue)); 1606 clear_bit(SOCK_ASYNC_WAITDATA, &sk->sk_socket->flags); 1607 finish_wait(sk_sleep(sk), &wait); 1608 return rc; 1609} 1610EXPORT_SYMBOL(sk_wait_data); 1611 1612/** 1613 * __sk_mem_schedule - increase sk_forward_alloc and memory_allocated 1614 * @sk: socket 1615 * @size: memory size to allocate 1616 * @kind: allocation type 1617 * 1618 * If kind is SK_MEM_SEND, it means wmem allocation. Otherwise it means 1619 * rmem allocation. This function assumes that protocols which have 1620 * memory_pressure use sk_wmem_queued as write buffer accounting. 1621 */ 1622int __sk_mem_schedule(struct sock *sk, int size, int kind) 1623{ 1624 struct proto *prot = sk->sk_prot; 1625 int amt = sk_mem_pages(size); 1626 int allocated; 1627 1628 sk->sk_forward_alloc += amt * SK_MEM_QUANTUM; 1629 allocated = atomic_add_return(amt, prot->memory_allocated); 1630 1631 /* Under limit. */ 1632 if (allocated <= prot->sysctl_mem[0]) { 1633 if (prot->memory_pressure && *prot->memory_pressure) 1634 *prot->memory_pressure = 0; 1635 return 1; 1636 } 1637 1638 /* Under pressure. */ 1639 if (allocated > prot->sysctl_mem[1]) 1640 if (prot->enter_memory_pressure) 1641 prot->enter_memory_pressure(sk); 1642 1643 /* Over hard limit. */ 1644 if (allocated > prot->sysctl_mem[2]) 1645 goto suppress_allocation; 1646 1647 /* guarantee minimum buffer size under pressure */ 1648 if (kind == SK_MEM_RECV) { 1649 if (atomic_read(&sk->sk_rmem_alloc) < prot->sysctl_rmem[0]) 1650 return 1; 1651 } else { /* SK_MEM_SEND */ 1652 if (sk->sk_type == SOCK_STREAM) { 1653 if (sk->sk_wmem_queued < prot->sysctl_wmem[0]) 1654 return 1; 1655 } else if (atomic_read(&sk->sk_wmem_alloc) < 1656 prot->sysctl_wmem[0]) 1657 return 1; 1658 } 1659 1660 if (prot->memory_pressure) { 1661 int alloc; 1662 1663 if (!*prot->memory_pressure) 1664 return 1; 1665 alloc = percpu_counter_read_positive(prot->sockets_allocated); 1666 if (prot->sysctl_mem[2] > alloc * 1667 sk_mem_pages(sk->sk_wmem_queued + 1668 atomic_read(&sk->sk_rmem_alloc) + 1669 sk->sk_forward_alloc)) 1670 return 1; 1671 } 1672 1673suppress_allocation: 1674 1675 if (kind == SK_MEM_SEND && sk->sk_type == SOCK_STREAM) { 1676 sk_stream_moderate_sndbuf(sk); 1677 1678 /* Fail only if socket is _under_ its sndbuf. 1679 * In this case we cannot block, so that we have to fail. 1680 */ 1681 if (sk->sk_wmem_queued + size >= sk->sk_sndbuf) 1682 return 1; 1683 } 1684 1685 /* Alas. Undo changes. */ 1686 sk->sk_forward_alloc -= amt * SK_MEM_QUANTUM; 1687 atomic_sub(amt, prot->memory_allocated); 1688 return 0; 1689} 1690EXPORT_SYMBOL(__sk_mem_schedule); 1691 1692/** 1693 * __sk_reclaim - reclaim memory_allocated 1694 * @sk: socket 1695 */ 1696void __sk_mem_reclaim(struct sock *sk) 1697{ 1698 struct proto *prot = sk->sk_prot; 1699 1700 atomic_sub(sk->sk_forward_alloc >> SK_MEM_QUANTUM_SHIFT, 1701 prot->memory_allocated); 1702 sk->sk_forward_alloc &= SK_MEM_QUANTUM - 1; 1703 1704 if (prot->memory_pressure && *prot->memory_pressure && 1705 (atomic_read(prot->memory_allocated) < prot->sysctl_mem[0])) 1706 *prot->memory_pressure = 0; 1707} 1708EXPORT_SYMBOL(__sk_mem_reclaim); 1709 1710 1711/* 1712 * Set of default routines for initialising struct proto_ops when 1713 * the protocol does not support a particular function. In certain 1714 * cases where it makes no sense for a protocol to have a "do nothing" 1715 * function, some default processing is provided. 1716 */ 1717 1718int sock_no_bind(struct socket *sock, struct sockaddr *saddr, int len) 1719{ 1720 return -EOPNOTSUPP; 1721} 1722EXPORT_SYMBOL(sock_no_bind); 1723 1724int sock_no_connect(struct socket *sock, struct sockaddr *saddr, 1725 int len, int flags) 1726{ 1727 return -EOPNOTSUPP; 1728} 1729EXPORT_SYMBOL(sock_no_connect); 1730 1731int sock_no_socketpair(struct socket *sock1, struct socket *sock2) 1732{ 1733 return -EOPNOTSUPP; 1734} 1735EXPORT_SYMBOL(sock_no_socketpair); 1736 1737int sock_no_accept(struct socket *sock, struct socket *newsock, int flags) 1738{ 1739 return -EOPNOTSUPP; 1740} 1741EXPORT_SYMBOL(sock_no_accept); 1742 1743int sock_no_getname(struct socket *sock, struct sockaddr *saddr, 1744 int *len, int peer) 1745{ 1746 return -EOPNOTSUPP; 1747} 1748EXPORT_SYMBOL(sock_no_getname); 1749 1750unsigned int sock_no_poll(struct file *file, struct socket *sock, poll_table *pt) 1751{ 1752 return 0; 1753} 1754EXPORT_SYMBOL(sock_no_poll); 1755 1756int sock_no_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg) 1757{ 1758 return -EOPNOTSUPP; 1759} 1760EXPORT_SYMBOL(sock_no_ioctl); 1761 1762int sock_no_listen(struct socket *sock, int backlog) 1763{ 1764 return -EOPNOTSUPP; 1765} 1766EXPORT_SYMBOL(sock_no_listen); 1767 1768int sock_no_shutdown(struct socket *sock, int how) 1769{ 1770 return -EOPNOTSUPP; 1771} 1772EXPORT_SYMBOL(sock_no_shutdown); 1773 1774int sock_no_setsockopt(struct socket *sock, int level, int optname, 1775 char __user *optval, unsigned int optlen) 1776{ 1777 return -EOPNOTSUPP; 1778} 1779EXPORT_SYMBOL(sock_no_setsockopt); 1780 1781int sock_no_getsockopt(struct socket *sock, int level, int optname, 1782 char __user *optval, int __user *optlen) 1783{ 1784 return -EOPNOTSUPP; 1785} 1786EXPORT_SYMBOL(sock_no_getsockopt); 1787 1788int sock_no_sendmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *m, 1789 size_t len) 1790{ 1791 return -EOPNOTSUPP; 1792} 1793EXPORT_SYMBOL(sock_no_sendmsg); 1794 1795int sock_no_recvmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *m, 1796 size_t len, int flags) 1797{ 1798 return -EOPNOTSUPP; 1799} 1800EXPORT_SYMBOL(sock_no_recvmsg); 1801 1802int sock_no_mmap(struct file *file, struct socket *sock, struct vm_area_struct *vma) 1803{ 1804 /* Mirror missing mmap method error code */ 1805 return -ENODEV; 1806} 1807EXPORT_SYMBOL(sock_no_mmap); 1808 1809ssize_t sock_no_sendpage(struct socket *sock, struct page *page, int offset, size_t size, int flags) 1810{ 1811 ssize_t res; 1812 struct msghdr msg = {.msg_flags = flags}; 1813 struct kvec iov; 1814 char *kaddr = kmap(page); 1815 iov.iov_base = kaddr + offset; 1816 iov.iov_len = size; 1817 res = kernel_sendmsg(sock, &msg, &iov, 1, size); 1818 kunmap(page); 1819 return res; 1820} 1821EXPORT_SYMBOL(sock_no_sendpage); 1822 1823/* 1824 * Default Socket Callbacks 1825 */ 1826 1827static void sock_def_wakeup(struct sock *sk) 1828{ 1829 struct socket_wq *wq; 1830 1831 rcu_read_lock(); 1832 wq = rcu_dereference(sk->sk_wq); 1833 if (wq_has_sleeper(wq)) 1834 wake_up_interruptible_all(&wq->wait); 1835 rcu_read_unlock(); 1836} 1837 1838static void sock_def_error_report(struct sock *sk) 1839{ 1840 struct socket_wq *wq; 1841 1842 rcu_read_lock(); 1843 wq = rcu_dereference(sk->sk_wq); 1844 if (wq_has_sleeper(wq)) 1845 wake_up_interruptible_poll(&wq->wait, POLLERR); 1846 sk_wake_async(sk, SOCK_WAKE_IO, POLL_ERR); 1847 rcu_read_unlock(); 1848} 1849 1850static void sock_def_readable(struct sock *sk, int len) 1851{ 1852 struct socket_wq *wq; 1853 1854 rcu_read_lock(); 1855 wq = rcu_dereference(sk->sk_wq); 1856 if (wq_has_sleeper(wq)) 1857 wake_up_interruptible_sync_poll(&wq->wait, POLLIN | 1858 POLLRDNORM | POLLRDBAND); 1859 sk_wake_async(sk, SOCK_WAKE_WAITD, POLL_IN); 1860 rcu_read_unlock(); 1861} 1862 1863static void sock_def_write_space(struct sock *sk) 1864{ 1865 struct socket_wq *wq; 1866 1867 rcu_read_lock(); 1868 1869 /* Do not wake up a writer until he can make "significant" 1870 * progress. --DaveM 1871 */ 1872 if ((atomic_read(&sk->sk_wmem_alloc) << 1) <= sk->sk_sndbuf) { 1873 wq = rcu_dereference(sk->sk_wq); 1874 if (wq_has_sleeper(wq)) 1875 wake_up_interruptible_sync_poll(&wq->wait, POLLOUT | 1876 POLLWRNORM | POLLWRBAND); 1877 1878 /* Should agree with poll, otherwise some programs break */ 1879 if (sock_writeable(sk)) 1880 sk_wake_async(sk, SOCK_WAKE_SPACE, POLL_OUT); 1881 } 1882 1883 rcu_read_unlock(); 1884} 1885 1886static void sock_def_destruct(struct sock *sk) 1887{ 1888 kfree(sk->sk_protinfo); 1889} 1890 1891void sk_send_sigurg(struct sock *sk) 1892{ 1893 if (sk->sk_socket && sk->sk_socket->file) 1894 if (send_sigurg(&sk->sk_socket->file->f_owner)) 1895 sk_wake_async(sk, SOCK_WAKE_URG, POLL_PRI); 1896} 1897EXPORT_SYMBOL(sk_send_sigurg); 1898 1899void sk_reset_timer(struct sock *sk, struct timer_list* timer, 1900 unsigned long expires) 1901{ 1902 if (!mod_timer(timer, expires)) 1903 sock_hold(sk); 1904} 1905EXPORT_SYMBOL(sk_reset_timer); 1906 1907void sk_stop_timer(struct sock *sk, struct timer_list* timer) 1908{ 1909 if (timer_pending(timer) && del_timer(timer)) 1910 __sock_put(sk); 1911} 1912EXPORT_SYMBOL(sk_stop_timer); 1913 1914void sock_init_data(struct socket *sock, struct sock *sk) 1915{ 1916 skb_queue_head_init(&sk->sk_receive_queue); 1917 skb_queue_head_init(&sk->sk_write_queue); 1918 skb_queue_head_init(&sk->sk_error_queue); 1919#ifdef CONFIG_NET_DMA 1920 skb_queue_head_init(&sk->sk_async_wait_queue); 1921#endif 1922 1923 sk->sk_send_head = NULL; 1924 1925 init_timer(&sk->sk_timer); 1926 1927 sk->sk_allocation = GFP_KERNEL; 1928 sk->sk_rcvbuf = sysctl_rmem_default; 1929 sk->sk_sndbuf = sysctl_wmem_default; 1930 sk->sk_state = TCP_CLOSE; 1931 sk_set_socket(sk, sock); 1932 1933 sock_set_flag(sk, SOCK_ZAPPED); 1934 1935 if (sock) { 1936 sk->sk_type = sock->type; 1937 sk->sk_wq = sock->wq; 1938 sock->sk = sk; 1939 } else 1940 sk->sk_wq = NULL; 1941 1942 spin_lock_init(&sk->sk_dst_lock); 1943 rwlock_init(&sk->sk_callback_lock); 1944 lockdep_set_class_and_name(&sk->sk_callback_lock, 1945 af_callback_keys + sk->sk_family, 1946 af_family_clock_key_strings[sk->sk_family]); 1947 1948 sk->sk_state_change = sock_def_wakeup; 1949 sk->sk_data_ready = sock_def_readable; 1950 sk->sk_write_space = sock_def_write_space; 1951 sk->sk_error_report = sock_def_error_report; 1952 sk->sk_destruct = sock_def_destruct; 1953 1954 sk->sk_sndmsg_page = NULL; 1955 sk->sk_sndmsg_off = 0; 1956 1957 sk->sk_peercred.pid = 0; 1958 sk->sk_peercred.uid = -1; 1959 sk->sk_peercred.gid = -1; 1960 sk->sk_write_pending = 0; 1961 sk->sk_rcvlowat = 1; 1962 sk->sk_rcvtimeo = MAX_SCHEDULE_TIMEOUT; 1963 sk->sk_sndtimeo = MAX_SCHEDULE_TIMEOUT; 1964 1965 sk->sk_stamp = ktime_set(-1L, 0); 1966 1967 /* 1968 * Before updating sk_refcnt, we must commit prior changes to memory 1969 * (Documentation/RCU/rculist_nulls.txt for details) 1970 */ 1971 smp_wmb(); 1972 atomic_set(&sk->sk_refcnt, 1); 1973 atomic_set(&sk->sk_drops, 0); 1974} 1975EXPORT_SYMBOL(sock_init_data); 1976 1977void lock_sock_nested(struct sock *sk, int subclass) 1978{ 1979 might_sleep(); 1980 spin_lock_bh(&sk->sk_lock.slock); 1981 if (sk->sk_lock.owned) 1982 __lock_sock(sk); 1983 sk->sk_lock.owned = 1; 1984 spin_unlock(&sk->sk_lock.slock); 1985 /* 1986 * The sk_lock has mutex_lock() semantics here: 1987 */ 1988 mutex_acquire(&sk->sk_lock.dep_map, subclass, 0, _RET_IP_); 1989 local_bh_enable(); 1990} 1991EXPORT_SYMBOL(lock_sock_nested); 1992 1993void release_sock(struct sock *sk) 1994{ 1995 /* 1996 * The sk_lock has mutex_unlock() semantics: 1997 */ 1998 mutex_release(&sk->sk_lock.dep_map, 1, _RET_IP_); 1999 2000 spin_lock_bh(&sk->sk_lock.slock); 2001 if (sk->sk_backlog.tail) 2002 __release_sock(sk); 2003 sk->sk_lock.owned = 0; 2004 if (waitqueue_active(&sk->sk_lock.wq)) 2005 wake_up(&sk->sk_lock.wq); 2006 spin_unlock_bh(&sk->sk_lock.slock); 2007} 2008EXPORT_SYMBOL(release_sock); 2009 2010int sock_get_timestamp(struct sock *sk, struct timeval __user *userstamp) 2011{ 2012 struct timeval tv; 2013 if (!sock_flag(sk, SOCK_TIMESTAMP)) 2014 sock_enable_timestamp(sk, SOCK_TIMESTAMP); 2015 tv = ktime_to_timeval(sk->sk_stamp); 2016 if (tv.tv_sec == -1) 2017 return -ENOENT; 2018 if (tv.tv_sec == 0) { 2019 sk->sk_stamp = ktime_get_real(); 2020 tv = ktime_to_timeval(sk->sk_stamp); 2021 } 2022 return copy_to_user(userstamp, &tv, sizeof(tv)) ? -EFAULT : 0; 2023} 2024EXPORT_SYMBOL(sock_get_timestamp); 2025 2026int sock_get_timestampns(struct sock *sk, struct timespec __user *userstamp) 2027{ 2028 struct timespec ts; 2029 if (!sock_flag(sk, SOCK_TIMESTAMP)) 2030 sock_enable_timestamp(sk, SOCK_TIMESTAMP); 2031 ts = ktime_to_timespec(sk->sk_stamp); 2032 if (ts.tv_sec == -1) 2033 return -ENOENT; 2034 if (ts.tv_sec == 0) { 2035 sk->sk_stamp = ktime_get_real(); 2036 ts = ktime_to_timespec(sk->sk_stamp); 2037 } 2038 return copy_to_user(userstamp, &ts, sizeof(ts)) ? -EFAULT : 0; 2039} 2040EXPORT_SYMBOL(sock_get_timestampns); 2041 2042void sock_enable_timestamp(struct sock *sk, int flag) 2043{ 2044 if (!sock_flag(sk, flag)) { 2045 sock_set_flag(sk, flag); 2046 /* 2047 * we just set one of the two flags which require net 2048 * time stamping, but time stamping might have been on 2049 * already because of the other one 2050 */ 2051 if (!sock_flag(sk, 2052 flag == SOCK_TIMESTAMP ? 2053 SOCK_TIMESTAMPING_RX_SOFTWARE : 2054 SOCK_TIMESTAMP)) 2055 net_enable_timestamp(); 2056 } 2057} 2058 2059/* 2060 * Get a socket option on an socket. 2061 * 2062 * FIX: POSIX 1003.1g is very ambiguous here. It states that 2063 * asynchronous errors should be reported by getsockopt. We assume 2064 * this means if you specify SO_ERROR (otherwise whats the point of it). 2065 */ 2066int sock_common_getsockopt(struct socket *sock, int level, int optname, 2067 char __user *optval, int __user *optlen) 2068{ 2069 struct sock *sk = sock->sk; 2070 2071 return sk->sk_prot->getsockopt(sk, level, optname, optval, optlen); 2072} 2073EXPORT_SYMBOL(sock_common_getsockopt); 2074 2075#ifdef CONFIG_COMPAT 2076int compat_sock_common_getsockopt(struct socket *sock, int level, int optname, 2077 char __user *optval, int __user *optlen) 2078{ 2079 struct sock *sk = sock->sk; 2080 2081 if (sk->sk_prot->compat_getsockopt != NULL) 2082 return sk->sk_prot->compat_getsockopt(sk, level, optname, 2083 optval, optlen); 2084 return sk->sk_prot->getsockopt(sk, level, optname, optval, optlen); 2085} 2086EXPORT_SYMBOL(compat_sock_common_getsockopt); 2087#endif 2088 2089int sock_common_recvmsg(struct kiocb *iocb, struct socket *sock, 2090 struct msghdr *msg, size_t size, int flags) 2091{ 2092 struct sock *sk = sock->sk; 2093 int addr_len = 0; 2094 int err; 2095 2096 err = sk->sk_prot->recvmsg(iocb, sk, msg, size, flags & MSG_DONTWAIT, 2097 flags & ~MSG_DONTWAIT, &addr_len); 2098 if (err >= 0) 2099 msg->msg_namelen = addr_len; 2100 return err; 2101} 2102EXPORT_SYMBOL(sock_common_recvmsg); 2103 2104/* 2105 * Set socket options on an inet socket. 2106 */ 2107int sock_common_setsockopt(struct socket *sock, int level, int optname, 2108 char __user *optval, unsigned int optlen) 2109{ 2110 struct sock *sk = sock->sk; 2111 2112 return sk->sk_prot->setsockopt(sk, level, optname, optval, optlen); 2113} 2114EXPORT_SYMBOL(sock_common_setsockopt); 2115 2116#ifdef CONFIG_COMPAT 2117int compat_sock_common_setsockopt(struct socket *sock, int level, int optname, 2118 char __user *optval, unsigned int optlen) 2119{ 2120 struct sock *sk = sock->sk; 2121 2122 if (sk->sk_prot->compat_setsockopt != NULL) 2123 return sk->sk_prot->compat_setsockopt(sk, level, optname, 2124 optval, optlen); 2125 return sk->sk_prot->setsockopt(sk, level, optname, optval, optlen); 2126} 2127EXPORT_SYMBOL(compat_sock_common_setsockopt); 2128#endif 2129 2130void sk_common_release(struct sock *sk) 2131{ 2132 if (sk->sk_prot->destroy) 2133 sk->sk_prot->destroy(sk); 2134 2135 /* 2136 * Observation: when sock_common_release is called, processes have 2137 * no access to socket. But net still has. 2138 * Step one, detach it from networking: 2139 * 2140 * A. Remove from hash tables. 2141 */ 2142 2143 sk->sk_prot->unhash(sk); 2144 2145 /* 2146 * In this point socket cannot receive new packets, but it is possible 2147 * that some packets are in flight because some CPU runs receiver and 2148 * did hash table lookup before we unhashed socket. They will achieve 2149 * receive queue and will be purged by socket destructor. 2150 * 2151 * Also we still have packets pending on receive queue and probably, 2152 * our own packets waiting in device queues. sock_destroy will drain 2153 * receive queue, but transmitted packets will delay socket destruction 2154 * until the last reference will be released. 2155 */ 2156 2157 sock_orphan(sk); 2158 2159 xfrm_sk_free_policy(sk); 2160 2161 sk_refcnt_debug_release(sk); 2162 sock_put(sk); 2163} 2164EXPORT_SYMBOL(sk_common_release); 2165 2166static DEFINE_RWLOCK(proto_list_lock); 2167static LIST_HEAD(proto_list); 2168 2169#ifdef CONFIG_PROC_FS 2170#define PROTO_INUSE_NR 64 /* should be enough for the first time */ 2171struct prot_inuse { 2172 int val[PROTO_INUSE_NR]; 2173}; 2174 2175static DECLARE_BITMAP(proto_inuse_idx, PROTO_INUSE_NR); 2176 2177#ifdef CONFIG_NET_NS 2178void sock_prot_inuse_add(struct net *net, struct proto *prot, int val) 2179{ 2180 int cpu = smp_processor_id(); 2181 per_cpu_ptr(net->core.inuse, cpu)->val[prot->inuse_idx] += val; 2182} 2183EXPORT_SYMBOL_GPL(sock_prot_inuse_add); 2184 2185int sock_prot_inuse_get(struct net *net, struct proto *prot) 2186{ 2187 int cpu, idx = prot->inuse_idx; 2188 int res = 0; 2189 2190 for_each_possible_cpu(cpu) 2191 res += per_cpu_ptr(net->core.inuse, cpu)->val[idx]; 2192 2193 return res >= 0 ? res : 0; 2194} 2195EXPORT_SYMBOL_GPL(sock_prot_inuse_get); 2196 2197static int __net_init sock_inuse_init_net(struct net *net) 2198{ 2199 net->core.inuse = alloc_percpu(struct prot_inuse); 2200 return net->core.inuse ? 0 : -ENOMEM; 2201} 2202 2203static void __net_exit sock_inuse_exit_net(struct net *net) 2204{ 2205 free_percpu(net->core.inuse); 2206} 2207 2208static struct pernet_operations net_inuse_ops = { 2209 .init = sock_inuse_init_net, 2210 .exit = sock_inuse_exit_net, 2211}; 2212 2213static __init int net_inuse_init(void) 2214{ 2215 if (register_pernet_subsys(&net_inuse_ops)) 2216 panic("Cannot initialize net inuse counters"); 2217 2218 return 0; 2219} 2220 2221core_initcall(net_inuse_init); 2222#else 2223static DEFINE_PER_CPU(struct prot_inuse, prot_inuse); 2224 2225void sock_prot_inuse_add(struct net *net, struct proto *prot, int val) 2226{ 2227 __get_cpu_var(prot_inuse).val[prot->inuse_idx] += val; 2228} 2229EXPORT_SYMBOL_GPL(sock_prot_inuse_add); 2230 2231int sock_prot_inuse_get(struct net *net, struct proto *prot) 2232{ 2233 int cpu, idx = prot->inuse_idx; 2234 int res = 0; 2235 2236 for_each_possible_cpu(cpu) 2237 res += per_cpu(prot_inuse, cpu).val[idx]; 2238 2239 return res >= 0 ? res : 0; 2240} 2241EXPORT_SYMBOL_GPL(sock_prot_inuse_get); 2242#endif 2243 2244static void assign_proto_idx(struct proto *prot) 2245{ 2246 prot->inuse_idx = find_first_zero_bit(proto_inuse_idx, PROTO_INUSE_NR); 2247 2248 if (unlikely(prot->inuse_idx == PROTO_INUSE_NR - 1)) { 2249 printk(KERN_ERR "PROTO_INUSE_NR exhausted\n"); 2250 return; 2251 } 2252 2253 set_bit(prot->inuse_idx, proto_inuse_idx); 2254} 2255 2256static void release_proto_idx(struct proto *prot) 2257{ 2258 if (prot->inuse_idx != PROTO_INUSE_NR - 1) 2259 clear_bit(prot->inuse_idx, proto_inuse_idx); 2260} 2261#else 2262static inline void assign_proto_idx(struct proto *prot) 2263{ 2264} 2265 2266static inline void release_proto_idx(struct proto *prot) 2267{ 2268} 2269#endif 2270 2271int proto_register(struct proto *prot, int alloc_slab) 2272{ 2273 if (alloc_slab) { 2274 prot->slab = kmem_cache_create(prot->name, prot->obj_size, 0, 2275 SLAB_HWCACHE_ALIGN | prot->slab_flags, 2276 NULL); 2277 2278 if (prot->slab == NULL) { 2279 printk(KERN_CRIT "%s: Can't create sock SLAB cache!\n", 2280 prot->name); 2281 goto out; 2282 } 2283 2284 if (prot->rsk_prot != NULL) { 2285 prot->rsk_prot->slab_name = kasprintf(GFP_KERNEL, "request_sock_%s", prot->name); 2286 if (prot->rsk_prot->slab_name == NULL) 2287 goto out_free_sock_slab; 2288 2289 prot->rsk_prot->slab = kmem_cache_create(prot->rsk_prot->slab_name, 2290 prot->rsk_prot->obj_size, 0, 2291 SLAB_HWCACHE_ALIGN, NULL); 2292 2293 if (prot->rsk_prot->slab == NULL) { 2294 printk(KERN_CRIT "%s: Can't create request sock SLAB cache!\n", 2295 prot->name); 2296 goto out_free_request_sock_slab_name; 2297 } 2298 } 2299 2300 if (prot->twsk_prot != NULL) { 2301 prot->twsk_prot->twsk_slab_name = kasprintf(GFP_KERNEL, "tw_sock_%s", prot->name); 2302 2303 if (prot->twsk_prot->twsk_slab_name == NULL) 2304 goto out_free_request_sock_slab; 2305 2306 prot->twsk_prot->twsk_slab = 2307 kmem_cache_create(prot->twsk_prot->twsk_slab_name, 2308 prot->twsk_prot->twsk_obj_size, 2309 0, 2310 SLAB_HWCACHE_ALIGN | 2311 prot->slab_flags, 2312 NULL); 2313 if (prot->twsk_prot->twsk_slab == NULL) 2314 goto out_free_timewait_sock_slab_name; 2315 } 2316 } 2317 2318 write_lock(&proto_list_lock); 2319 list_add(&prot->node, &proto_list); 2320 assign_proto_idx(prot); 2321 write_unlock(&proto_list_lock); 2322 return 0; 2323 2324out_free_timewait_sock_slab_name: 2325 kfree(prot->twsk_prot->twsk_slab_name); 2326out_free_request_sock_slab: 2327 if (prot->rsk_prot && prot->rsk_prot->slab) { 2328 kmem_cache_destroy(prot->rsk_prot->slab); 2329 prot->rsk_prot->slab = NULL; 2330 } 2331out_free_request_sock_slab_name: 2332 if (prot->rsk_prot) 2333 kfree(prot->rsk_prot->slab_name); 2334out_free_sock_slab: 2335 kmem_cache_destroy(prot->slab); 2336 prot->slab = NULL; 2337out: 2338 return -ENOBUFS; 2339} 2340EXPORT_SYMBOL(proto_register); 2341 2342void proto_unregister(struct proto *prot) 2343{ 2344 write_lock(&proto_list_lock); 2345 release_proto_idx(prot); 2346 list_del(&prot->node); 2347 write_unlock(&proto_list_lock); 2348 2349 if (prot->slab != NULL) { 2350 kmem_cache_destroy(prot->slab); 2351 prot->slab = NULL; 2352 } 2353 2354 if (prot->rsk_prot != NULL && prot->rsk_prot->slab != NULL) { 2355 kmem_cache_destroy(prot->rsk_prot->slab); 2356 kfree(prot->rsk_prot->slab_name); 2357 prot->rsk_prot->slab = NULL; 2358 } 2359 2360 if (prot->twsk_prot != NULL && prot->twsk_prot->twsk_slab != NULL) { 2361 kmem_cache_destroy(prot->twsk_prot->twsk_slab); 2362 kfree(prot->twsk_prot->twsk_slab_name); 2363 prot->twsk_prot->twsk_slab = NULL; 2364 } 2365} 2366EXPORT_SYMBOL(proto_unregister); 2367 2368#ifdef CONFIG_PROC_FS 2369static void *proto_seq_start(struct seq_file *seq, loff_t *pos) 2370 __acquires(proto_list_lock) 2371{ 2372 read_lock(&proto_list_lock); 2373 return seq_list_start_head(&proto_list, *pos); 2374} 2375 2376static void *proto_seq_next(struct seq_file *seq, void *v, loff_t *pos) 2377{ 2378 return seq_list_next(v, &proto_list, pos); 2379} 2380 2381static void proto_seq_stop(struct seq_file *seq, void *v) 2382 __releases(proto_list_lock) 2383{ 2384 read_unlock(&proto_list_lock); 2385} 2386 2387static char proto_method_implemented(const void *method) 2388{ 2389 return method == NULL ? 'n' : 'y'; 2390} 2391 2392static void proto_seq_printf(struct seq_file *seq, struct proto *proto) 2393{ 2394 seq_printf(seq, "%-9s %4u %6d %6d %-3s %6u %-3s %-10s " 2395 "%2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c\n", 2396 proto->name, 2397 proto->obj_size, 2398 sock_prot_inuse_get(seq_file_net(seq), proto), 2399 proto->memory_allocated != NULL ? atomic_read(proto->memory_allocated) : -1, 2400 proto->memory_pressure != NULL ? *proto->memory_pressure ? "yes" : "no" : "NI", 2401 proto->max_header, 2402 proto->slab == NULL ? "no" : "yes", 2403 module_name(proto->owner), 2404 proto_method_implemented(proto->close), 2405 proto_method_implemented(proto->connect), 2406 proto_method_implemented(proto->disconnect), 2407 proto_method_implemented(proto->accept), 2408 proto_method_implemented(proto->ioctl), 2409 proto_method_implemented(proto->init), 2410 proto_method_implemented(proto->destroy), 2411 proto_method_implemented(proto->shutdown), 2412 proto_method_implemented(proto->setsockopt), 2413 proto_method_implemented(proto->getsockopt), 2414 proto_method_implemented(proto->sendmsg), 2415 proto_method_implemented(proto->recvmsg), 2416 proto_method_implemented(proto->sendpage), 2417 proto_method_implemented(proto->bind), 2418 proto_method_implemented(proto->backlog_rcv), 2419 proto_method_implemented(proto->hash), 2420 proto_method_implemented(proto->unhash), 2421 proto_method_implemented(proto->get_port), 2422 proto_method_implemented(proto->enter_memory_pressure)); 2423} 2424 2425static int proto_seq_show(struct seq_file *seq, void *v) 2426{ 2427 if (v == &proto_list) 2428 seq_printf(seq, "%-9s %-4s %-8s %-6s %-5s %-7s %-4s %-10s %s", 2429 "protocol", 2430 "size", 2431 "sockets", 2432 "memory", 2433 "press", 2434 "maxhdr", 2435 "slab", 2436 "module", 2437 "cl co di ac io in de sh ss gs se re sp bi br ha uh gp em\n"); 2438 else 2439 proto_seq_printf(seq, list_entry(v, struct proto, node)); 2440 return 0; 2441} 2442 2443static const struct seq_operations proto_seq_ops = { 2444 .start = proto_seq_start, 2445 .next = proto_seq_next, 2446 .stop = proto_seq_stop, 2447 .show = proto_seq_show, 2448}; 2449 2450static int proto_seq_open(struct inode *inode, struct file *file) 2451{ 2452 return seq_open_net(inode, file, &proto_seq_ops, 2453 sizeof(struct seq_net_private)); 2454} 2455 2456static const struct file_operations proto_seq_fops = { 2457 .owner = THIS_MODULE, 2458 .open = proto_seq_open, 2459 .read = seq_read, 2460 .llseek = seq_lseek, 2461 .release = seq_release_net, 2462}; 2463 2464static __net_init int proto_init_net(struct net *net) 2465{ 2466 if (!proc_net_fops_create(net, "protocols", S_IRUGO, &proto_seq_fops)) 2467 return -ENOMEM; 2468 2469 return 0; 2470} 2471 2472static __net_exit void proto_exit_net(struct net *net) 2473{ 2474 proc_net_remove(net, "protocols"); 2475} 2476 2477 2478static __net_initdata struct pernet_operations proto_net_ops = { 2479 .init = proto_init_net, 2480 .exit = proto_exit_net, 2481}; 2482 2483static int __init proto_init(void) 2484{ 2485 return register_pernet_subsys(&proto_net_ops); 2486} 2487 2488subsys_initcall(proto_init); 2489 2490#endif /* PROC_FS */ 2491