sock.c revision c7fe3b52c1283b8ba810eb6ecddf1c8a0bcc13ab
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#include <linux/user_namespace.h> 114 115#include <asm/uaccess.h> 116#include <asm/system.h> 117 118#include <linux/netdevice.h> 119#include <net/protocol.h> 120#include <linux/skbuff.h> 121#include <net/net_namespace.h> 122#include <net/request_sock.h> 123#include <net/sock.h> 124#include <linux/net_tstamp.h> 125#include <net/xfrm.h> 126#include <linux/ipsec.h> 127#include <net/cls_cgroup.h> 128 129#include <linux/filter.h> 130 131#ifdef CONFIG_INET 132#include <net/tcp.h> 133#endif 134 135/* 136 * Each address family might have different locking rules, so we have 137 * one slock key per address family: 138 */ 139static struct lock_class_key af_family_keys[AF_MAX]; 140static struct lock_class_key af_family_slock_keys[AF_MAX]; 141 142/* 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 *const 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-AF_RDS" , "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_ISDN" , "sk_lock-AF_PHONET" , 160 "sk_lock-AF_IEEE802154", "sk_lock-AF_CAIF" , "sk_lock-AF_ALG" , 161 "sk_lock-AF_NFC" , "sk_lock-AF_MAX" 162}; 163static const char *const af_family_slock_key_strings[AF_MAX+1] = { 164 "slock-AF_UNSPEC", "slock-AF_UNIX" , "slock-AF_INET" , 165 "slock-AF_AX25" , "slock-AF_IPX" , "slock-AF_APPLETALK", 166 "slock-AF_NETROM", "slock-AF_BRIDGE" , "slock-AF_ATMPVC" , 167 "slock-AF_X25" , "slock-AF_INET6" , "slock-AF_ROSE" , 168 "slock-AF_DECnet", "slock-AF_NETBEUI" , "slock-AF_SECURITY" , 169 "slock-AF_KEY" , "slock-AF_NETLINK" , "slock-AF_PACKET" , 170 "slock-AF_ASH" , "slock-AF_ECONET" , "slock-AF_ATMSVC" , 171 "slock-AF_RDS" , "slock-AF_SNA" , "slock-AF_IRDA" , 172 "slock-AF_PPPOX" , "slock-AF_WANPIPE" , "slock-AF_LLC" , 173 "slock-27" , "slock-28" , "slock-AF_CAN" , 174 "slock-AF_TIPC" , "slock-AF_BLUETOOTH", "slock-AF_IUCV" , 175 "slock-AF_RXRPC" , "slock-AF_ISDN" , "slock-AF_PHONET" , 176 "slock-AF_IEEE802154", "slock-AF_CAIF" , "slock-AF_ALG" , 177 "slock-AF_NFC" , "slock-AF_MAX" 178}; 179static const char *const af_family_clock_key_strings[AF_MAX+1] = { 180 "clock-AF_UNSPEC", "clock-AF_UNIX" , "clock-AF_INET" , 181 "clock-AF_AX25" , "clock-AF_IPX" , "clock-AF_APPLETALK", 182 "clock-AF_NETROM", "clock-AF_BRIDGE" , "clock-AF_ATMPVC" , 183 "clock-AF_X25" , "clock-AF_INET6" , "clock-AF_ROSE" , 184 "clock-AF_DECnet", "clock-AF_NETBEUI" , "clock-AF_SECURITY" , 185 "clock-AF_KEY" , "clock-AF_NETLINK" , "clock-AF_PACKET" , 186 "clock-AF_ASH" , "clock-AF_ECONET" , "clock-AF_ATMSVC" , 187 "clock-AF_RDS" , "clock-AF_SNA" , "clock-AF_IRDA" , 188 "clock-AF_PPPOX" , "clock-AF_WANPIPE" , "clock-AF_LLC" , 189 "clock-27" , "clock-28" , "clock-AF_CAN" , 190 "clock-AF_TIPC" , "clock-AF_BLUETOOTH", "clock-AF_IUCV" , 191 "clock-AF_RXRPC" , "clock-AF_ISDN" , "clock-AF_PHONET" , 192 "clock-AF_IEEE802154", "clock-AF_CAIF" , "clock-AF_ALG" , 193 "clock-AF_NFC" , "clock-AF_MAX" 194}; 195 196/* 197 * sk_callback_lock locking rules are per-address-family, 198 * so split the lock classes by using a per-AF key: 199 */ 200static struct lock_class_key af_callback_keys[AF_MAX]; 201 202/* Take into consideration the size of the struct sk_buff overhead in the 203 * determination of these values, since that is non-constant across 204 * platforms. This makes socket queueing behavior and performance 205 * not depend upon such differences. 206 */ 207#define _SK_MEM_PACKETS 256 208#define _SK_MEM_OVERHEAD (sizeof(struct sk_buff) + 256) 209#define SK_WMEM_MAX (_SK_MEM_OVERHEAD * _SK_MEM_PACKETS) 210#define SK_RMEM_MAX (_SK_MEM_OVERHEAD * _SK_MEM_PACKETS) 211 212/* Run time adjustable parameters. */ 213__u32 sysctl_wmem_max __read_mostly = SK_WMEM_MAX; 214__u32 sysctl_rmem_max __read_mostly = SK_RMEM_MAX; 215__u32 sysctl_wmem_default __read_mostly = SK_WMEM_MAX; 216__u32 sysctl_rmem_default __read_mostly = SK_RMEM_MAX; 217 218/* Maximal space eaten by iovec or ancillary data plus some space */ 219int sysctl_optmem_max __read_mostly = sizeof(unsigned long)*(2*UIO_MAXIOV+512); 220EXPORT_SYMBOL(sysctl_optmem_max); 221 222#if defined(CONFIG_CGROUPS) && !defined(CONFIG_NET_CLS_CGROUP) 223int net_cls_subsys_id = -1; 224EXPORT_SYMBOL_GPL(net_cls_subsys_id); 225#endif 226 227static int sock_set_timeout(long *timeo_p, char __user *optval, int optlen) 228{ 229 struct timeval tv; 230 231 if (optlen < sizeof(tv)) 232 return -EINVAL; 233 if (copy_from_user(&tv, optval, sizeof(tv))) 234 return -EFAULT; 235 if (tv.tv_usec < 0 || tv.tv_usec >= USEC_PER_SEC) 236 return -EDOM; 237 238 if (tv.tv_sec < 0) { 239 static int warned __read_mostly; 240 241 *timeo_p = 0; 242 if (warned < 10 && net_ratelimit()) { 243 warned++; 244 printk(KERN_INFO "sock_set_timeout: `%s' (pid %d) " 245 "tries to set negative timeout\n", 246 current->comm, task_pid_nr(current)); 247 } 248 return 0; 249 } 250 *timeo_p = MAX_SCHEDULE_TIMEOUT; 251 if (tv.tv_sec == 0 && tv.tv_usec == 0) 252 return 0; 253 if (tv.tv_sec < (MAX_SCHEDULE_TIMEOUT/HZ - 1)) 254 *timeo_p = tv.tv_sec*HZ + (tv.tv_usec+(1000000/HZ-1))/(1000000/HZ); 255 return 0; 256} 257 258static void sock_warn_obsolete_bsdism(const char *name) 259{ 260 static int warned; 261 static char warncomm[TASK_COMM_LEN]; 262 if (strcmp(warncomm, current->comm) && warned < 5) { 263 strcpy(warncomm, current->comm); 264 printk(KERN_WARNING "process `%s' is using obsolete " 265 "%s SO_BSDCOMPAT\n", warncomm, name); 266 warned++; 267 } 268} 269 270static void sock_disable_timestamp(struct sock *sk, int flag) 271{ 272 if (sock_flag(sk, flag)) { 273 sock_reset_flag(sk, flag); 274 if (!sock_flag(sk, SOCK_TIMESTAMP) && 275 !sock_flag(sk, SOCK_TIMESTAMPING_RX_SOFTWARE)) { 276 net_disable_timestamp(); 277 } 278 } 279} 280 281 282int sock_queue_rcv_skb(struct sock *sk, struct sk_buff *skb) 283{ 284 int err; 285 int skb_len; 286 unsigned long flags; 287 struct sk_buff_head *list = &sk->sk_receive_queue; 288 289 /* Cast sk->rcvbuf to unsigned... It's pointless, but reduces 290 number of warnings when compiling with -W --ANK 291 */ 292 if (atomic_read(&sk->sk_rmem_alloc) + skb->truesize >= 293 (unsigned)sk->sk_rcvbuf) { 294 atomic_inc(&sk->sk_drops); 295 return -ENOMEM; 296 } 297 298 err = sk_filter(sk, skb); 299 if (err) 300 return err; 301 302 if (!sk_rmem_schedule(sk, skb->truesize)) { 303 atomic_inc(&sk->sk_drops); 304 return -ENOBUFS; 305 } 306 307 skb->dev = NULL; 308 skb_set_owner_r(skb, sk); 309 310 /* Cache the SKB length before we tack it onto the receive 311 * queue. Once it is added it no longer belongs to us and 312 * may be freed by other threads of control pulling packets 313 * from the queue. 314 */ 315 skb_len = skb->len; 316 317 /* we escape from rcu protected region, make sure we dont leak 318 * a norefcounted dst 319 */ 320 skb_dst_force(skb); 321 322 spin_lock_irqsave(&list->lock, flags); 323 skb->dropcount = atomic_read(&sk->sk_drops); 324 __skb_queue_tail(list, skb); 325 spin_unlock_irqrestore(&list->lock, flags); 326 327 if (!sock_flag(sk, SOCK_DEAD)) 328 sk->sk_data_ready(sk, skb_len); 329 return 0; 330} 331EXPORT_SYMBOL(sock_queue_rcv_skb); 332 333int sk_receive_skb(struct sock *sk, struct sk_buff *skb, const int nested) 334{ 335 int rc = NET_RX_SUCCESS; 336 337 if (sk_filter(sk, skb)) 338 goto discard_and_relse; 339 340 skb->dev = NULL; 341 342 if (sk_rcvqueues_full(sk, skb)) { 343 atomic_inc(&sk->sk_drops); 344 goto discard_and_relse; 345 } 346 if (nested) 347 bh_lock_sock_nested(sk); 348 else 349 bh_lock_sock(sk); 350 if (!sock_owned_by_user(sk)) { 351 /* 352 * trylock + unlock semantics: 353 */ 354 mutex_acquire(&sk->sk_lock.dep_map, 0, 1, _RET_IP_); 355 356 rc = sk_backlog_rcv(sk, skb); 357 358 mutex_release(&sk->sk_lock.dep_map, 1, _RET_IP_); 359 } else if (sk_add_backlog(sk, skb)) { 360 bh_unlock_sock(sk); 361 atomic_inc(&sk->sk_drops); 362 goto discard_and_relse; 363 } 364 365 bh_unlock_sock(sk); 366out: 367 sock_put(sk); 368 return rc; 369discard_and_relse: 370 kfree_skb(skb); 371 goto out; 372} 373EXPORT_SYMBOL(sk_receive_skb); 374 375void sk_reset_txq(struct sock *sk) 376{ 377 sk_tx_queue_clear(sk); 378} 379EXPORT_SYMBOL(sk_reset_txq); 380 381struct dst_entry *__sk_dst_check(struct sock *sk, u32 cookie) 382{ 383 struct dst_entry *dst = __sk_dst_get(sk); 384 385 if (dst && dst->obsolete && dst->ops->check(dst, cookie) == NULL) { 386 sk_tx_queue_clear(sk); 387 rcu_assign_pointer(sk->sk_dst_cache, NULL); 388 dst_release(dst); 389 return NULL; 390 } 391 392 return dst; 393} 394EXPORT_SYMBOL(__sk_dst_check); 395 396struct dst_entry *sk_dst_check(struct sock *sk, u32 cookie) 397{ 398 struct dst_entry *dst = sk_dst_get(sk); 399 400 if (dst && dst->obsolete && dst->ops->check(dst, cookie) == NULL) { 401 sk_dst_reset(sk); 402 dst_release(dst); 403 return NULL; 404 } 405 406 return dst; 407} 408EXPORT_SYMBOL(sk_dst_check); 409 410static int sock_bindtodevice(struct sock *sk, char __user *optval, int optlen) 411{ 412 int ret = -ENOPROTOOPT; 413#ifdef CONFIG_NETDEVICES 414 struct net *net = sock_net(sk); 415 char devname[IFNAMSIZ]; 416 int index; 417 418 /* Sorry... */ 419 ret = -EPERM; 420 if (!capable(CAP_NET_RAW)) 421 goto out; 422 423 ret = -EINVAL; 424 if (optlen < 0) 425 goto out; 426 427 /* Bind this socket to a particular device like "eth0", 428 * as specified in the passed interface name. If the 429 * name is "" or the option length is zero the socket 430 * is not bound. 431 */ 432 if (optlen > IFNAMSIZ - 1) 433 optlen = IFNAMSIZ - 1; 434 memset(devname, 0, sizeof(devname)); 435 436 ret = -EFAULT; 437 if (copy_from_user(devname, optval, optlen)) 438 goto out; 439 440 index = 0; 441 if (devname[0] != '\0') { 442 struct net_device *dev; 443 444 rcu_read_lock(); 445 dev = dev_get_by_name_rcu(net, devname); 446 if (dev) 447 index = dev->ifindex; 448 rcu_read_unlock(); 449 ret = -ENODEV; 450 if (!dev) 451 goto out; 452 } 453 454 lock_sock(sk); 455 sk->sk_bound_dev_if = index; 456 sk_dst_reset(sk); 457 release_sock(sk); 458 459 ret = 0; 460 461out: 462#endif 463 464 return ret; 465} 466 467static inline void sock_valbool_flag(struct sock *sk, int bit, int valbool) 468{ 469 if (valbool) 470 sock_set_flag(sk, bit); 471 else 472 sock_reset_flag(sk, bit); 473} 474 475/* 476 * This is meant for all protocols to use and covers goings on 477 * at the socket level. Everything here is generic. 478 */ 479 480int sock_setsockopt(struct socket *sock, int level, int optname, 481 char __user *optval, unsigned int optlen) 482{ 483 struct sock *sk = sock->sk; 484 int val; 485 int valbool; 486 struct linger ling; 487 int ret = 0; 488 489 /* 490 * Options without arguments 491 */ 492 493 if (optname == SO_BINDTODEVICE) 494 return sock_bindtodevice(sk, optval, optlen); 495 496 if (optlen < sizeof(int)) 497 return -EINVAL; 498 499 if (get_user(val, (int __user *)optval)) 500 return -EFAULT; 501 502 valbool = val ? 1 : 0; 503 504 lock_sock(sk); 505 506 switch (optname) { 507 case SO_DEBUG: 508 if (val && !capable(CAP_NET_ADMIN)) 509 ret = -EACCES; 510 else 511 sock_valbool_flag(sk, SOCK_DBG, valbool); 512 break; 513 case SO_REUSEADDR: 514 sk->sk_reuse = valbool; 515 break; 516 case SO_TYPE: 517 case SO_PROTOCOL: 518 case SO_DOMAIN: 519 case SO_ERROR: 520 ret = -ENOPROTOOPT; 521 break; 522 case SO_DONTROUTE: 523 sock_valbool_flag(sk, SOCK_LOCALROUTE, valbool); 524 break; 525 case SO_BROADCAST: 526 sock_valbool_flag(sk, SOCK_BROADCAST, valbool); 527 break; 528 case SO_SNDBUF: 529 /* Don't error on this BSD doesn't and if you think 530 about it this is right. Otherwise apps have to 531 play 'guess the biggest size' games. RCVBUF/SNDBUF 532 are treated in BSD as hints */ 533 534 if (val > sysctl_wmem_max) 535 val = sysctl_wmem_max; 536set_sndbuf: 537 sk->sk_userlocks |= SOCK_SNDBUF_LOCK; 538 if ((val * 2) < SOCK_MIN_SNDBUF) 539 sk->sk_sndbuf = SOCK_MIN_SNDBUF; 540 else 541 sk->sk_sndbuf = val * 2; 542 543 /* 544 * Wake up sending tasks if we 545 * upped the value. 546 */ 547 sk->sk_write_space(sk); 548 break; 549 550 case SO_SNDBUFFORCE: 551 if (!capable(CAP_NET_ADMIN)) { 552 ret = -EPERM; 553 break; 554 } 555 goto set_sndbuf; 556 557 case SO_RCVBUF: 558 /* Don't error on this BSD doesn't and if you think 559 about it this is right. Otherwise apps have to 560 play 'guess the biggest size' games. RCVBUF/SNDBUF 561 are treated in BSD as hints */ 562 563 if (val > sysctl_rmem_max) 564 val = sysctl_rmem_max; 565set_rcvbuf: 566 sk->sk_userlocks |= SOCK_RCVBUF_LOCK; 567 /* 568 * We double it on the way in to account for 569 * "struct sk_buff" etc. overhead. Applications 570 * assume that the SO_RCVBUF setting they make will 571 * allow that much actual data to be received on that 572 * socket. 573 * 574 * Applications are unaware that "struct sk_buff" and 575 * other overheads allocate from the receive buffer 576 * during socket buffer allocation. 577 * 578 * And after considering the possible alternatives, 579 * returning the value we actually used in getsockopt 580 * is the most desirable behavior. 581 */ 582 if ((val * 2) < SOCK_MIN_RCVBUF) 583 sk->sk_rcvbuf = SOCK_MIN_RCVBUF; 584 else 585 sk->sk_rcvbuf = val * 2; 586 break; 587 588 case SO_RCVBUFFORCE: 589 if (!capable(CAP_NET_ADMIN)) { 590 ret = -EPERM; 591 break; 592 } 593 goto set_rcvbuf; 594 595 case SO_KEEPALIVE: 596#ifdef CONFIG_INET 597 if (sk->sk_protocol == IPPROTO_TCP) 598 tcp_set_keepalive(sk, valbool); 599#endif 600 sock_valbool_flag(sk, SOCK_KEEPOPEN, valbool); 601 break; 602 603 case SO_OOBINLINE: 604 sock_valbool_flag(sk, SOCK_URGINLINE, valbool); 605 break; 606 607 case SO_NO_CHECK: 608 sk->sk_no_check = valbool; 609 break; 610 611 case SO_PRIORITY: 612 if ((val >= 0 && val <= 6) || capable(CAP_NET_ADMIN)) 613 sk->sk_priority = val; 614 else 615 ret = -EPERM; 616 break; 617 618 case SO_LINGER: 619 if (optlen < sizeof(ling)) { 620 ret = -EINVAL; /* 1003.1g */ 621 break; 622 } 623 if (copy_from_user(&ling, optval, sizeof(ling))) { 624 ret = -EFAULT; 625 break; 626 } 627 if (!ling.l_onoff) 628 sock_reset_flag(sk, SOCK_LINGER); 629 else { 630#if (BITS_PER_LONG == 32) 631 if ((unsigned int)ling.l_linger >= MAX_SCHEDULE_TIMEOUT/HZ) 632 sk->sk_lingertime = MAX_SCHEDULE_TIMEOUT; 633 else 634#endif 635 sk->sk_lingertime = (unsigned int)ling.l_linger * HZ; 636 sock_set_flag(sk, SOCK_LINGER); 637 } 638 break; 639 640 case SO_BSDCOMPAT: 641 sock_warn_obsolete_bsdism("setsockopt"); 642 break; 643 644 case SO_PASSCRED: 645 if (valbool) 646 set_bit(SOCK_PASSCRED, &sock->flags); 647 else 648 clear_bit(SOCK_PASSCRED, &sock->flags); 649 break; 650 651 case SO_TIMESTAMP: 652 case SO_TIMESTAMPNS: 653 if (valbool) { 654 if (optname == SO_TIMESTAMP) 655 sock_reset_flag(sk, SOCK_RCVTSTAMPNS); 656 else 657 sock_set_flag(sk, SOCK_RCVTSTAMPNS); 658 sock_set_flag(sk, SOCK_RCVTSTAMP); 659 sock_enable_timestamp(sk, SOCK_TIMESTAMP); 660 } else { 661 sock_reset_flag(sk, SOCK_RCVTSTAMP); 662 sock_reset_flag(sk, SOCK_RCVTSTAMPNS); 663 } 664 break; 665 666 case SO_TIMESTAMPING: 667 if (val & ~SOF_TIMESTAMPING_MASK) { 668 ret = -EINVAL; 669 break; 670 } 671 sock_valbool_flag(sk, SOCK_TIMESTAMPING_TX_HARDWARE, 672 val & SOF_TIMESTAMPING_TX_HARDWARE); 673 sock_valbool_flag(sk, SOCK_TIMESTAMPING_TX_SOFTWARE, 674 val & SOF_TIMESTAMPING_TX_SOFTWARE); 675 sock_valbool_flag(sk, SOCK_TIMESTAMPING_RX_HARDWARE, 676 val & SOF_TIMESTAMPING_RX_HARDWARE); 677 if (val & SOF_TIMESTAMPING_RX_SOFTWARE) 678 sock_enable_timestamp(sk, 679 SOCK_TIMESTAMPING_RX_SOFTWARE); 680 else 681 sock_disable_timestamp(sk, 682 SOCK_TIMESTAMPING_RX_SOFTWARE); 683 sock_valbool_flag(sk, SOCK_TIMESTAMPING_SOFTWARE, 684 val & SOF_TIMESTAMPING_SOFTWARE); 685 sock_valbool_flag(sk, SOCK_TIMESTAMPING_SYS_HARDWARE, 686 val & SOF_TIMESTAMPING_SYS_HARDWARE); 687 sock_valbool_flag(sk, SOCK_TIMESTAMPING_RAW_HARDWARE, 688 val & SOF_TIMESTAMPING_RAW_HARDWARE); 689 break; 690 691 case SO_RCVLOWAT: 692 if (val < 0) 693 val = INT_MAX; 694 sk->sk_rcvlowat = val ? : 1; 695 break; 696 697 case SO_RCVTIMEO: 698 ret = sock_set_timeout(&sk->sk_rcvtimeo, optval, optlen); 699 break; 700 701 case SO_SNDTIMEO: 702 ret = sock_set_timeout(&sk->sk_sndtimeo, optval, optlen); 703 break; 704 705 case SO_ATTACH_FILTER: 706 ret = -EINVAL; 707 if (optlen == sizeof(struct sock_fprog)) { 708 struct sock_fprog fprog; 709 710 ret = -EFAULT; 711 if (copy_from_user(&fprog, optval, sizeof(fprog))) 712 break; 713 714 ret = sk_attach_filter(&fprog, sk); 715 } 716 break; 717 718 case SO_DETACH_FILTER: 719 ret = sk_detach_filter(sk); 720 break; 721 722 case SO_PASSSEC: 723 if (valbool) 724 set_bit(SOCK_PASSSEC, &sock->flags); 725 else 726 clear_bit(SOCK_PASSSEC, &sock->flags); 727 break; 728 case SO_MARK: 729 if (!capable(CAP_NET_ADMIN)) 730 ret = -EPERM; 731 else 732 sk->sk_mark = val; 733 break; 734 735 /* We implement the SO_SNDLOWAT etc to 736 not be settable (1003.1g 5.3) */ 737 case SO_RXQ_OVFL: 738 if (valbool) 739 sock_set_flag(sk, SOCK_RXQ_OVFL); 740 else 741 sock_reset_flag(sk, SOCK_RXQ_OVFL); 742 break; 743 default: 744 ret = -ENOPROTOOPT; 745 break; 746 } 747 release_sock(sk); 748 return ret; 749} 750EXPORT_SYMBOL(sock_setsockopt); 751 752 753void cred_to_ucred(struct pid *pid, const struct cred *cred, 754 struct ucred *ucred) 755{ 756 ucred->pid = pid_vnr(pid); 757 ucred->uid = ucred->gid = -1; 758 if (cred) { 759 struct user_namespace *current_ns = current_user_ns(); 760 761 ucred->uid = user_ns_map_uid(current_ns, cred, cred->euid); 762 ucred->gid = user_ns_map_gid(current_ns, cred, cred->egid); 763 } 764} 765EXPORT_SYMBOL_GPL(cred_to_ucred); 766 767int sock_getsockopt(struct socket *sock, int level, int optname, 768 char __user *optval, int __user *optlen) 769{ 770 struct sock *sk = sock->sk; 771 772 union { 773 int val; 774 struct linger ling; 775 struct timeval tm; 776 } v; 777 778 int lv = sizeof(int); 779 int len; 780 781 if (get_user(len, optlen)) 782 return -EFAULT; 783 if (len < 0) 784 return -EINVAL; 785 786 memset(&v, 0, sizeof(v)); 787 788 switch (optname) { 789 case SO_DEBUG: 790 v.val = sock_flag(sk, SOCK_DBG); 791 break; 792 793 case SO_DONTROUTE: 794 v.val = sock_flag(sk, SOCK_LOCALROUTE); 795 break; 796 797 case SO_BROADCAST: 798 v.val = !!sock_flag(sk, SOCK_BROADCAST); 799 break; 800 801 case SO_SNDBUF: 802 v.val = sk->sk_sndbuf; 803 break; 804 805 case SO_RCVBUF: 806 v.val = sk->sk_rcvbuf; 807 break; 808 809 case SO_REUSEADDR: 810 v.val = sk->sk_reuse; 811 break; 812 813 case SO_KEEPALIVE: 814 v.val = !!sock_flag(sk, SOCK_KEEPOPEN); 815 break; 816 817 case SO_TYPE: 818 v.val = sk->sk_type; 819 break; 820 821 case SO_PROTOCOL: 822 v.val = sk->sk_protocol; 823 break; 824 825 case SO_DOMAIN: 826 v.val = sk->sk_family; 827 break; 828 829 case SO_ERROR: 830 v.val = -sock_error(sk); 831 if (v.val == 0) 832 v.val = xchg(&sk->sk_err_soft, 0); 833 break; 834 835 case SO_OOBINLINE: 836 v.val = !!sock_flag(sk, SOCK_URGINLINE); 837 break; 838 839 case SO_NO_CHECK: 840 v.val = sk->sk_no_check; 841 break; 842 843 case SO_PRIORITY: 844 v.val = sk->sk_priority; 845 break; 846 847 case SO_LINGER: 848 lv = sizeof(v.ling); 849 v.ling.l_onoff = !!sock_flag(sk, SOCK_LINGER); 850 v.ling.l_linger = sk->sk_lingertime / HZ; 851 break; 852 853 case SO_BSDCOMPAT: 854 sock_warn_obsolete_bsdism("getsockopt"); 855 break; 856 857 case SO_TIMESTAMP: 858 v.val = sock_flag(sk, SOCK_RCVTSTAMP) && 859 !sock_flag(sk, SOCK_RCVTSTAMPNS); 860 break; 861 862 case SO_TIMESTAMPNS: 863 v.val = sock_flag(sk, SOCK_RCVTSTAMPNS); 864 break; 865 866 case SO_TIMESTAMPING: 867 v.val = 0; 868 if (sock_flag(sk, SOCK_TIMESTAMPING_TX_HARDWARE)) 869 v.val |= SOF_TIMESTAMPING_TX_HARDWARE; 870 if (sock_flag(sk, SOCK_TIMESTAMPING_TX_SOFTWARE)) 871 v.val |= SOF_TIMESTAMPING_TX_SOFTWARE; 872 if (sock_flag(sk, SOCK_TIMESTAMPING_RX_HARDWARE)) 873 v.val |= SOF_TIMESTAMPING_RX_HARDWARE; 874 if (sock_flag(sk, SOCK_TIMESTAMPING_RX_SOFTWARE)) 875 v.val |= SOF_TIMESTAMPING_RX_SOFTWARE; 876 if (sock_flag(sk, SOCK_TIMESTAMPING_SOFTWARE)) 877 v.val |= SOF_TIMESTAMPING_SOFTWARE; 878 if (sock_flag(sk, SOCK_TIMESTAMPING_SYS_HARDWARE)) 879 v.val |= SOF_TIMESTAMPING_SYS_HARDWARE; 880 if (sock_flag(sk, SOCK_TIMESTAMPING_RAW_HARDWARE)) 881 v.val |= SOF_TIMESTAMPING_RAW_HARDWARE; 882 break; 883 884 case SO_RCVTIMEO: 885 lv = sizeof(struct timeval); 886 if (sk->sk_rcvtimeo == MAX_SCHEDULE_TIMEOUT) { 887 v.tm.tv_sec = 0; 888 v.tm.tv_usec = 0; 889 } else { 890 v.tm.tv_sec = sk->sk_rcvtimeo / HZ; 891 v.tm.tv_usec = ((sk->sk_rcvtimeo % HZ) * 1000000) / HZ; 892 } 893 break; 894 895 case SO_SNDTIMEO: 896 lv = sizeof(struct timeval); 897 if (sk->sk_sndtimeo == MAX_SCHEDULE_TIMEOUT) { 898 v.tm.tv_sec = 0; 899 v.tm.tv_usec = 0; 900 } else { 901 v.tm.tv_sec = sk->sk_sndtimeo / HZ; 902 v.tm.tv_usec = ((sk->sk_sndtimeo % HZ) * 1000000) / HZ; 903 } 904 break; 905 906 case SO_RCVLOWAT: 907 v.val = sk->sk_rcvlowat; 908 break; 909 910 case SO_SNDLOWAT: 911 v.val = 1; 912 break; 913 914 case SO_PASSCRED: 915 v.val = test_bit(SOCK_PASSCRED, &sock->flags) ? 1 : 0; 916 break; 917 918 case SO_PEERCRED: 919 { 920 struct ucred peercred; 921 if (len > sizeof(peercred)) 922 len = sizeof(peercred); 923 cred_to_ucred(sk->sk_peer_pid, sk->sk_peer_cred, &peercred); 924 if (copy_to_user(optval, &peercred, len)) 925 return -EFAULT; 926 goto lenout; 927 } 928 929 case SO_PEERNAME: 930 { 931 char address[128]; 932 933 if (sock->ops->getname(sock, (struct sockaddr *)address, &lv, 2)) 934 return -ENOTCONN; 935 if (lv < len) 936 return -EINVAL; 937 if (copy_to_user(optval, address, len)) 938 return -EFAULT; 939 goto lenout; 940 } 941 942 /* Dubious BSD thing... Probably nobody even uses it, but 943 * the UNIX standard wants it for whatever reason... -DaveM 944 */ 945 case SO_ACCEPTCONN: 946 v.val = sk->sk_state == TCP_LISTEN; 947 break; 948 949 case SO_PASSSEC: 950 v.val = test_bit(SOCK_PASSSEC, &sock->flags) ? 1 : 0; 951 break; 952 953 case SO_PEERSEC: 954 return security_socket_getpeersec_stream(sock, optval, optlen, len); 955 956 case SO_MARK: 957 v.val = sk->sk_mark; 958 break; 959 960 case SO_RXQ_OVFL: 961 v.val = !!sock_flag(sk, SOCK_RXQ_OVFL); 962 break; 963 964 default: 965 return -ENOPROTOOPT; 966 } 967 968 if (len > lv) 969 len = lv; 970 if (copy_to_user(optval, &v, len)) 971 return -EFAULT; 972lenout: 973 if (put_user(len, optlen)) 974 return -EFAULT; 975 return 0; 976} 977 978/* 979 * Initialize an sk_lock. 980 * 981 * (We also register the sk_lock with the lock validator.) 982 */ 983static inline void sock_lock_init(struct sock *sk) 984{ 985 sock_lock_init_class_and_name(sk, 986 af_family_slock_key_strings[sk->sk_family], 987 af_family_slock_keys + sk->sk_family, 988 af_family_key_strings[sk->sk_family], 989 af_family_keys + sk->sk_family); 990} 991 992/* 993 * Copy all fields from osk to nsk but nsk->sk_refcnt must not change yet, 994 * even temporarly, because of RCU lookups. sk_node should also be left as is. 995 * We must not copy fields between sk_dontcopy_begin and sk_dontcopy_end 996 */ 997static void sock_copy(struct sock *nsk, const struct sock *osk) 998{ 999#ifdef CONFIG_SECURITY_NETWORK 1000 void *sptr = nsk->sk_security; 1001#endif 1002 memcpy(nsk, osk, offsetof(struct sock, sk_dontcopy_begin)); 1003 1004 memcpy(&nsk->sk_dontcopy_end, &osk->sk_dontcopy_end, 1005 osk->sk_prot->obj_size - offsetof(struct sock, sk_dontcopy_end)); 1006 1007#ifdef CONFIG_SECURITY_NETWORK 1008 nsk->sk_security = sptr; 1009 security_sk_clone(osk, nsk); 1010#endif 1011} 1012 1013/* 1014 * caches using SLAB_DESTROY_BY_RCU should let .next pointer from nulls nodes 1015 * un-modified. Special care is taken when initializing object to zero. 1016 */ 1017static inline void sk_prot_clear_nulls(struct sock *sk, int size) 1018{ 1019 if (offsetof(struct sock, sk_node.next) != 0) 1020 memset(sk, 0, offsetof(struct sock, sk_node.next)); 1021 memset(&sk->sk_node.pprev, 0, 1022 size - offsetof(struct sock, sk_node.pprev)); 1023} 1024 1025void sk_prot_clear_portaddr_nulls(struct sock *sk, int size) 1026{ 1027 unsigned long nulls1, nulls2; 1028 1029 nulls1 = offsetof(struct sock, __sk_common.skc_node.next); 1030 nulls2 = offsetof(struct sock, __sk_common.skc_portaddr_node.next); 1031 if (nulls1 > nulls2) 1032 swap(nulls1, nulls2); 1033 1034 if (nulls1 != 0) 1035 memset((char *)sk, 0, nulls1); 1036 memset((char *)sk + nulls1 + sizeof(void *), 0, 1037 nulls2 - nulls1 - sizeof(void *)); 1038 memset((char *)sk + nulls2 + sizeof(void *), 0, 1039 size - nulls2 - sizeof(void *)); 1040} 1041EXPORT_SYMBOL(sk_prot_clear_portaddr_nulls); 1042 1043static struct sock *sk_prot_alloc(struct proto *prot, gfp_t priority, 1044 int family) 1045{ 1046 struct sock *sk; 1047 struct kmem_cache *slab; 1048 1049 slab = prot->slab; 1050 if (slab != NULL) { 1051 sk = kmem_cache_alloc(slab, priority & ~__GFP_ZERO); 1052 if (!sk) 1053 return sk; 1054 if (priority & __GFP_ZERO) { 1055 if (prot->clear_sk) 1056 prot->clear_sk(sk, prot->obj_size); 1057 else 1058 sk_prot_clear_nulls(sk, prot->obj_size); 1059 } 1060 } else 1061 sk = kmalloc(prot->obj_size, priority); 1062 1063 if (sk != NULL) { 1064 kmemcheck_annotate_bitfield(sk, flags); 1065 1066 if (security_sk_alloc(sk, family, priority)) 1067 goto out_free; 1068 1069 if (!try_module_get(prot->owner)) 1070 goto out_free_sec; 1071 sk_tx_queue_clear(sk); 1072 } 1073 1074 return sk; 1075 1076out_free_sec: 1077 security_sk_free(sk); 1078out_free: 1079 if (slab != NULL) 1080 kmem_cache_free(slab, sk); 1081 else 1082 kfree(sk); 1083 return NULL; 1084} 1085 1086static void sk_prot_free(struct proto *prot, struct sock *sk) 1087{ 1088 struct kmem_cache *slab; 1089 struct module *owner; 1090 1091 owner = prot->owner; 1092 slab = prot->slab; 1093 1094 security_sk_free(sk); 1095 if (slab != NULL) 1096 kmem_cache_free(slab, sk); 1097 else 1098 kfree(sk); 1099 module_put(owner); 1100} 1101 1102#ifdef CONFIG_CGROUPS 1103void sock_update_classid(struct sock *sk) 1104{ 1105 u32 classid; 1106 1107 rcu_read_lock(); /* doing current task, which cannot vanish. */ 1108 classid = task_cls_classid(current); 1109 rcu_read_unlock(); 1110 if (classid && classid != sk->sk_classid) 1111 sk->sk_classid = classid; 1112} 1113EXPORT_SYMBOL(sock_update_classid); 1114#endif 1115 1116/** 1117 * sk_alloc - All socket objects are allocated here 1118 * @net: the applicable net namespace 1119 * @family: protocol family 1120 * @priority: for allocation (%GFP_KERNEL, %GFP_ATOMIC, etc) 1121 * @prot: struct proto associated with this new sock instance 1122 */ 1123struct sock *sk_alloc(struct net *net, int family, gfp_t priority, 1124 struct proto *prot) 1125{ 1126 struct sock *sk; 1127 1128 sk = sk_prot_alloc(prot, priority | __GFP_ZERO, family); 1129 if (sk) { 1130 sk->sk_family = family; 1131 /* 1132 * See comment in struct sock definition to understand 1133 * why we need sk_prot_creator -acme 1134 */ 1135 sk->sk_prot = sk->sk_prot_creator = prot; 1136 sock_lock_init(sk); 1137 sock_net_set(sk, get_net(net)); 1138 atomic_set(&sk->sk_wmem_alloc, 1); 1139 1140 sock_update_classid(sk); 1141 } 1142 1143 return sk; 1144} 1145EXPORT_SYMBOL(sk_alloc); 1146 1147static void __sk_free(struct sock *sk) 1148{ 1149 struct sk_filter *filter; 1150 1151 if (sk->sk_destruct) 1152 sk->sk_destruct(sk); 1153 1154 filter = rcu_dereference_check(sk->sk_filter, 1155 atomic_read(&sk->sk_wmem_alloc) == 0); 1156 if (filter) { 1157 sk_filter_uncharge(sk, filter); 1158 rcu_assign_pointer(sk->sk_filter, NULL); 1159 } 1160 1161 sock_disable_timestamp(sk, SOCK_TIMESTAMP); 1162 sock_disable_timestamp(sk, SOCK_TIMESTAMPING_RX_SOFTWARE); 1163 1164 if (atomic_read(&sk->sk_omem_alloc)) 1165 printk(KERN_DEBUG "%s: optmem leakage (%d bytes) detected.\n", 1166 __func__, atomic_read(&sk->sk_omem_alloc)); 1167 1168 if (sk->sk_peer_cred) 1169 put_cred(sk->sk_peer_cred); 1170 put_pid(sk->sk_peer_pid); 1171 put_net(sock_net(sk)); 1172 sk_prot_free(sk->sk_prot_creator, sk); 1173} 1174 1175void sk_free(struct sock *sk) 1176{ 1177 /* 1178 * We subtract one from sk_wmem_alloc and can know if 1179 * some packets are still in some tx queue. 1180 * If not null, sock_wfree() will call __sk_free(sk) later 1181 */ 1182 if (atomic_dec_and_test(&sk->sk_wmem_alloc)) 1183 __sk_free(sk); 1184} 1185EXPORT_SYMBOL(sk_free); 1186 1187/* 1188 * Last sock_put should drop reference to sk->sk_net. It has already 1189 * been dropped in sk_change_net. Taking reference to stopping namespace 1190 * is not an option. 1191 * Take reference to a socket to remove it from hash _alive_ and after that 1192 * destroy it in the context of init_net. 1193 */ 1194void sk_release_kernel(struct sock *sk) 1195{ 1196 if (sk == NULL || sk->sk_socket == NULL) 1197 return; 1198 1199 sock_hold(sk); 1200 sock_release(sk->sk_socket); 1201 release_net(sock_net(sk)); 1202 sock_net_set(sk, get_net(&init_net)); 1203 sock_put(sk); 1204} 1205EXPORT_SYMBOL(sk_release_kernel); 1206 1207struct sock *sk_clone(const struct sock *sk, const gfp_t priority) 1208{ 1209 struct sock *newsk; 1210 1211 newsk = sk_prot_alloc(sk->sk_prot, priority, sk->sk_family); 1212 if (newsk != NULL) { 1213 struct sk_filter *filter; 1214 1215 sock_copy(newsk, sk); 1216 1217 /* SANITY */ 1218 get_net(sock_net(newsk)); 1219 sk_node_init(&newsk->sk_node); 1220 sock_lock_init(newsk); 1221 bh_lock_sock(newsk); 1222 newsk->sk_backlog.head = newsk->sk_backlog.tail = NULL; 1223 newsk->sk_backlog.len = 0; 1224 1225 atomic_set(&newsk->sk_rmem_alloc, 0); 1226 /* 1227 * sk_wmem_alloc set to one (see sk_free() and sock_wfree()) 1228 */ 1229 atomic_set(&newsk->sk_wmem_alloc, 1); 1230 atomic_set(&newsk->sk_omem_alloc, 0); 1231 skb_queue_head_init(&newsk->sk_receive_queue); 1232 skb_queue_head_init(&newsk->sk_write_queue); 1233#ifdef CONFIG_NET_DMA 1234 skb_queue_head_init(&newsk->sk_async_wait_queue); 1235#endif 1236 1237 spin_lock_init(&newsk->sk_dst_lock); 1238 rwlock_init(&newsk->sk_callback_lock); 1239 lockdep_set_class_and_name(&newsk->sk_callback_lock, 1240 af_callback_keys + newsk->sk_family, 1241 af_family_clock_key_strings[newsk->sk_family]); 1242 1243 newsk->sk_dst_cache = NULL; 1244 newsk->sk_wmem_queued = 0; 1245 newsk->sk_forward_alloc = 0; 1246 newsk->sk_send_head = NULL; 1247 newsk->sk_userlocks = sk->sk_userlocks & ~SOCK_BINDPORT_LOCK; 1248 1249 sock_reset_flag(newsk, SOCK_DONE); 1250 skb_queue_head_init(&newsk->sk_error_queue); 1251 1252 filter = rcu_dereference_protected(newsk->sk_filter, 1); 1253 if (filter != NULL) 1254 sk_filter_charge(newsk, filter); 1255 1256 if (unlikely(xfrm_sk_clone_policy(newsk))) { 1257 /* It is still raw copy of parent, so invalidate 1258 * destructor and make plain sk_free() */ 1259 newsk->sk_destruct = NULL; 1260 sk_free(newsk); 1261 newsk = NULL; 1262 goto out; 1263 } 1264 1265 newsk->sk_err = 0; 1266 newsk->sk_priority = 0; 1267 /* 1268 * Before updating sk_refcnt, we must commit prior changes to memory 1269 * (Documentation/RCU/rculist_nulls.txt for details) 1270 */ 1271 smp_wmb(); 1272 atomic_set(&newsk->sk_refcnt, 2); 1273 1274 /* 1275 * Increment the counter in the same struct proto as the master 1276 * sock (sk_refcnt_debug_inc uses newsk->sk_prot->socks, that 1277 * is the same as sk->sk_prot->socks, as this field was copied 1278 * with memcpy). 1279 * 1280 * This _changes_ the previous behaviour, where 1281 * tcp_create_openreq_child always was incrementing the 1282 * equivalent to tcp_prot->socks (inet_sock_nr), so this have 1283 * to be taken into account in all callers. -acme 1284 */ 1285 sk_refcnt_debug_inc(newsk); 1286 sk_set_socket(newsk, NULL); 1287 newsk->sk_wq = NULL; 1288 1289 if (newsk->sk_prot->sockets_allocated) 1290 percpu_counter_inc(newsk->sk_prot->sockets_allocated); 1291 1292 if (sock_flag(newsk, SOCK_TIMESTAMP) || 1293 sock_flag(newsk, SOCK_TIMESTAMPING_RX_SOFTWARE)) 1294 net_enable_timestamp(); 1295 } 1296out: 1297 return newsk; 1298} 1299EXPORT_SYMBOL_GPL(sk_clone); 1300 1301void sk_setup_caps(struct sock *sk, struct dst_entry *dst) 1302{ 1303 __sk_dst_set(sk, dst); 1304 sk->sk_route_caps = dst->dev->features; 1305 if (sk->sk_route_caps & NETIF_F_GSO) 1306 sk->sk_route_caps |= NETIF_F_GSO_SOFTWARE; 1307 sk->sk_route_caps &= ~sk->sk_route_nocaps; 1308 if (sk_can_gso(sk)) { 1309 if (dst->header_len) { 1310 sk->sk_route_caps &= ~NETIF_F_GSO_MASK; 1311 } else { 1312 sk->sk_route_caps |= NETIF_F_SG | NETIF_F_HW_CSUM; 1313 sk->sk_gso_max_size = dst->dev->gso_max_size; 1314 } 1315 } 1316} 1317EXPORT_SYMBOL_GPL(sk_setup_caps); 1318 1319void __init sk_init(void) 1320{ 1321 if (totalram_pages <= 4096) { 1322 sysctl_wmem_max = 32767; 1323 sysctl_rmem_max = 32767; 1324 sysctl_wmem_default = 32767; 1325 sysctl_rmem_default = 32767; 1326 } else if (totalram_pages >= 131072) { 1327 sysctl_wmem_max = 131071; 1328 sysctl_rmem_max = 131071; 1329 } 1330} 1331 1332/* 1333 * Simple resource managers for sockets. 1334 */ 1335 1336 1337/* 1338 * Write buffer destructor automatically called from kfree_skb. 1339 */ 1340void sock_wfree(struct sk_buff *skb) 1341{ 1342 struct sock *sk = skb->sk; 1343 unsigned int len = skb->truesize; 1344 1345 if (!sock_flag(sk, SOCK_USE_WRITE_QUEUE)) { 1346 /* 1347 * Keep a reference on sk_wmem_alloc, this will be released 1348 * after sk_write_space() call 1349 */ 1350 atomic_sub(len - 1, &sk->sk_wmem_alloc); 1351 sk->sk_write_space(sk); 1352 len = 1; 1353 } 1354 /* 1355 * if sk_wmem_alloc reaches 0, we must finish what sk_free() 1356 * could not do because of in-flight packets 1357 */ 1358 if (atomic_sub_and_test(len, &sk->sk_wmem_alloc)) 1359 __sk_free(sk); 1360} 1361EXPORT_SYMBOL(sock_wfree); 1362 1363/* 1364 * Read buffer destructor automatically called from kfree_skb. 1365 */ 1366void sock_rfree(struct sk_buff *skb) 1367{ 1368 struct sock *sk = skb->sk; 1369 unsigned int len = skb->truesize; 1370 1371 atomic_sub(len, &sk->sk_rmem_alloc); 1372 sk_mem_uncharge(sk, len); 1373} 1374EXPORT_SYMBOL(sock_rfree); 1375 1376 1377int sock_i_uid(struct sock *sk) 1378{ 1379 int uid; 1380 1381 read_lock_bh(&sk->sk_callback_lock); 1382 uid = sk->sk_socket ? SOCK_INODE(sk->sk_socket)->i_uid : 0; 1383 read_unlock_bh(&sk->sk_callback_lock); 1384 return uid; 1385} 1386EXPORT_SYMBOL(sock_i_uid); 1387 1388unsigned long sock_i_ino(struct sock *sk) 1389{ 1390 unsigned long ino; 1391 1392 read_lock_bh(&sk->sk_callback_lock); 1393 ino = sk->sk_socket ? SOCK_INODE(sk->sk_socket)->i_ino : 0; 1394 read_unlock_bh(&sk->sk_callback_lock); 1395 return ino; 1396} 1397EXPORT_SYMBOL(sock_i_ino); 1398 1399/* 1400 * Allocate a skb from the socket's send buffer. 1401 */ 1402struct sk_buff *sock_wmalloc(struct sock *sk, unsigned long size, int force, 1403 gfp_t priority) 1404{ 1405 if (force || atomic_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf) { 1406 struct sk_buff *skb = alloc_skb(size, priority); 1407 if (skb) { 1408 skb_set_owner_w(skb, sk); 1409 return skb; 1410 } 1411 } 1412 return NULL; 1413} 1414EXPORT_SYMBOL(sock_wmalloc); 1415 1416/* 1417 * Allocate a skb from the socket's receive buffer. 1418 */ 1419struct sk_buff *sock_rmalloc(struct sock *sk, unsigned long size, int force, 1420 gfp_t priority) 1421{ 1422 if (force || atomic_read(&sk->sk_rmem_alloc) < sk->sk_rcvbuf) { 1423 struct sk_buff *skb = alloc_skb(size, priority); 1424 if (skb) { 1425 skb_set_owner_r(skb, sk); 1426 return skb; 1427 } 1428 } 1429 return NULL; 1430} 1431 1432/* 1433 * Allocate a memory block from the socket's option memory buffer. 1434 */ 1435void *sock_kmalloc(struct sock *sk, int size, gfp_t priority) 1436{ 1437 if ((unsigned)size <= sysctl_optmem_max && 1438 atomic_read(&sk->sk_omem_alloc) + size < sysctl_optmem_max) { 1439 void *mem; 1440 /* First do the add, to avoid the race if kmalloc 1441 * might sleep. 1442 */ 1443 atomic_add(size, &sk->sk_omem_alloc); 1444 mem = kmalloc(size, priority); 1445 if (mem) 1446 return mem; 1447 atomic_sub(size, &sk->sk_omem_alloc); 1448 } 1449 return NULL; 1450} 1451EXPORT_SYMBOL(sock_kmalloc); 1452 1453/* 1454 * Free an option memory block. 1455 */ 1456void sock_kfree_s(struct sock *sk, void *mem, int size) 1457{ 1458 kfree(mem); 1459 atomic_sub(size, &sk->sk_omem_alloc); 1460} 1461EXPORT_SYMBOL(sock_kfree_s); 1462 1463/* It is almost wait_for_tcp_memory minus release_sock/lock_sock. 1464 I think, these locks should be removed for datagram sockets. 1465 */ 1466static long sock_wait_for_wmem(struct sock *sk, long timeo) 1467{ 1468 DEFINE_WAIT(wait); 1469 1470 clear_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags); 1471 for (;;) { 1472 if (!timeo) 1473 break; 1474 if (signal_pending(current)) 1475 break; 1476 set_bit(SOCK_NOSPACE, &sk->sk_socket->flags); 1477 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE); 1478 if (atomic_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf) 1479 break; 1480 if (sk->sk_shutdown & SEND_SHUTDOWN) 1481 break; 1482 if (sk->sk_err) 1483 break; 1484 timeo = schedule_timeout(timeo); 1485 } 1486 finish_wait(sk_sleep(sk), &wait); 1487 return timeo; 1488} 1489 1490 1491/* 1492 * Generic send/receive buffer handlers 1493 */ 1494 1495struct sk_buff *sock_alloc_send_pskb(struct sock *sk, unsigned long header_len, 1496 unsigned long data_len, int noblock, 1497 int *errcode) 1498{ 1499 struct sk_buff *skb; 1500 gfp_t gfp_mask; 1501 long timeo; 1502 int err; 1503 1504 gfp_mask = sk->sk_allocation; 1505 if (gfp_mask & __GFP_WAIT) 1506 gfp_mask |= __GFP_REPEAT; 1507 1508 timeo = sock_sndtimeo(sk, noblock); 1509 while (1) { 1510 err = sock_error(sk); 1511 if (err != 0) 1512 goto failure; 1513 1514 err = -EPIPE; 1515 if (sk->sk_shutdown & SEND_SHUTDOWN) 1516 goto failure; 1517 1518 if (atomic_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf) { 1519 skb = alloc_skb(header_len, gfp_mask); 1520 if (skb) { 1521 int npages; 1522 int i; 1523 1524 /* No pages, we're done... */ 1525 if (!data_len) 1526 break; 1527 1528 npages = (data_len + (PAGE_SIZE - 1)) >> PAGE_SHIFT; 1529 skb->truesize += data_len; 1530 skb_shinfo(skb)->nr_frags = npages; 1531 for (i = 0; i < npages; i++) { 1532 struct page *page; 1533 skb_frag_t *frag; 1534 1535 page = alloc_pages(sk->sk_allocation, 0); 1536 if (!page) { 1537 err = -ENOBUFS; 1538 skb_shinfo(skb)->nr_frags = i; 1539 kfree_skb(skb); 1540 goto failure; 1541 } 1542 1543 frag = &skb_shinfo(skb)->frags[i]; 1544 frag->page = page; 1545 frag->page_offset = 0; 1546 frag->size = (data_len >= PAGE_SIZE ? 1547 PAGE_SIZE : 1548 data_len); 1549 data_len -= PAGE_SIZE; 1550 } 1551 1552 /* Full success... */ 1553 break; 1554 } 1555 err = -ENOBUFS; 1556 goto failure; 1557 } 1558 set_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags); 1559 set_bit(SOCK_NOSPACE, &sk->sk_socket->flags); 1560 err = -EAGAIN; 1561 if (!timeo) 1562 goto failure; 1563 if (signal_pending(current)) 1564 goto interrupted; 1565 timeo = sock_wait_for_wmem(sk, timeo); 1566 } 1567 1568 skb_set_owner_w(skb, sk); 1569 return skb; 1570 1571interrupted: 1572 err = sock_intr_errno(timeo); 1573failure: 1574 *errcode = err; 1575 return NULL; 1576} 1577EXPORT_SYMBOL(sock_alloc_send_pskb); 1578 1579struct sk_buff *sock_alloc_send_skb(struct sock *sk, unsigned long size, 1580 int noblock, int *errcode) 1581{ 1582 return sock_alloc_send_pskb(sk, size, 0, noblock, errcode); 1583} 1584EXPORT_SYMBOL(sock_alloc_send_skb); 1585 1586static void __lock_sock(struct sock *sk) 1587 __releases(&sk->sk_lock.slock) 1588 __acquires(&sk->sk_lock.slock) 1589{ 1590 DEFINE_WAIT(wait); 1591 1592 for (;;) { 1593 prepare_to_wait_exclusive(&sk->sk_lock.wq, &wait, 1594 TASK_UNINTERRUPTIBLE); 1595 spin_unlock_bh(&sk->sk_lock.slock); 1596 schedule(); 1597 spin_lock_bh(&sk->sk_lock.slock); 1598 if (!sock_owned_by_user(sk)) 1599 break; 1600 } 1601 finish_wait(&sk->sk_lock.wq, &wait); 1602} 1603 1604static void __release_sock(struct sock *sk) 1605 __releases(&sk->sk_lock.slock) 1606 __acquires(&sk->sk_lock.slock) 1607{ 1608 struct sk_buff *skb = sk->sk_backlog.head; 1609 1610 do { 1611 sk->sk_backlog.head = sk->sk_backlog.tail = NULL; 1612 bh_unlock_sock(sk); 1613 1614 do { 1615 struct sk_buff *next = skb->next; 1616 1617 WARN_ON_ONCE(skb_dst_is_noref(skb)); 1618 skb->next = NULL; 1619 sk_backlog_rcv(sk, skb); 1620 1621 /* 1622 * We are in process context here with softirqs 1623 * disabled, use cond_resched_softirq() to preempt. 1624 * This is safe to do because we've taken the backlog 1625 * queue private: 1626 */ 1627 cond_resched_softirq(); 1628 1629 skb = next; 1630 } while (skb != NULL); 1631 1632 bh_lock_sock(sk); 1633 } while ((skb = sk->sk_backlog.head) != NULL); 1634 1635 /* 1636 * Doing the zeroing here guarantee we can not loop forever 1637 * while a wild producer attempts to flood us. 1638 */ 1639 sk->sk_backlog.len = 0; 1640} 1641 1642/** 1643 * sk_wait_data - wait for data to arrive at sk_receive_queue 1644 * @sk: sock to wait on 1645 * @timeo: for how long 1646 * 1647 * Now socket state including sk->sk_err is changed only under lock, 1648 * hence we may omit checks after joining wait queue. 1649 * We check receive queue before schedule() only as optimization; 1650 * it is very likely that release_sock() added new data. 1651 */ 1652int sk_wait_data(struct sock *sk, long *timeo) 1653{ 1654 int rc; 1655 DEFINE_WAIT(wait); 1656 1657 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE); 1658 set_bit(SOCK_ASYNC_WAITDATA, &sk->sk_socket->flags); 1659 rc = sk_wait_event(sk, timeo, !skb_queue_empty(&sk->sk_receive_queue)); 1660 clear_bit(SOCK_ASYNC_WAITDATA, &sk->sk_socket->flags); 1661 finish_wait(sk_sleep(sk), &wait); 1662 return rc; 1663} 1664EXPORT_SYMBOL(sk_wait_data); 1665 1666/** 1667 * __sk_mem_schedule - increase sk_forward_alloc and memory_allocated 1668 * @sk: socket 1669 * @size: memory size to allocate 1670 * @kind: allocation type 1671 * 1672 * If kind is SK_MEM_SEND, it means wmem allocation. Otherwise it means 1673 * rmem allocation. This function assumes that protocols which have 1674 * memory_pressure use sk_wmem_queued as write buffer accounting. 1675 */ 1676int __sk_mem_schedule(struct sock *sk, int size, int kind) 1677{ 1678 struct proto *prot = sk->sk_prot; 1679 int amt = sk_mem_pages(size); 1680 long allocated; 1681 1682 sk->sk_forward_alloc += amt * SK_MEM_QUANTUM; 1683 allocated = atomic_long_add_return(amt, prot->memory_allocated); 1684 1685 /* Under limit. */ 1686 if (allocated <= prot->sysctl_mem[0]) { 1687 if (prot->memory_pressure && *prot->memory_pressure) 1688 *prot->memory_pressure = 0; 1689 return 1; 1690 } 1691 1692 /* Under pressure. */ 1693 if (allocated > prot->sysctl_mem[1]) 1694 if (prot->enter_memory_pressure) 1695 prot->enter_memory_pressure(sk); 1696 1697 /* Over hard limit. */ 1698 if (allocated > prot->sysctl_mem[2]) 1699 goto suppress_allocation; 1700 1701 /* guarantee minimum buffer size under pressure */ 1702 if (kind == SK_MEM_RECV) { 1703 if (atomic_read(&sk->sk_rmem_alloc) < prot->sysctl_rmem[0]) 1704 return 1; 1705 } else { /* SK_MEM_SEND */ 1706 if (sk->sk_type == SOCK_STREAM) { 1707 if (sk->sk_wmem_queued < prot->sysctl_wmem[0]) 1708 return 1; 1709 } else if (atomic_read(&sk->sk_wmem_alloc) < 1710 prot->sysctl_wmem[0]) 1711 return 1; 1712 } 1713 1714 if (prot->memory_pressure) { 1715 int alloc; 1716 1717 if (!*prot->memory_pressure) 1718 return 1; 1719 alloc = percpu_counter_read_positive(prot->sockets_allocated); 1720 if (prot->sysctl_mem[2] > alloc * 1721 sk_mem_pages(sk->sk_wmem_queued + 1722 atomic_read(&sk->sk_rmem_alloc) + 1723 sk->sk_forward_alloc)) 1724 return 1; 1725 } 1726 1727suppress_allocation: 1728 1729 if (kind == SK_MEM_SEND && sk->sk_type == SOCK_STREAM) { 1730 sk_stream_moderate_sndbuf(sk); 1731 1732 /* Fail only if socket is _under_ its sndbuf. 1733 * In this case we cannot block, so that we have to fail. 1734 */ 1735 if (sk->sk_wmem_queued + size >= sk->sk_sndbuf) 1736 return 1; 1737 } 1738 1739 /* Alas. Undo changes. */ 1740 sk->sk_forward_alloc -= amt * SK_MEM_QUANTUM; 1741 atomic_long_sub(amt, prot->memory_allocated); 1742 return 0; 1743} 1744EXPORT_SYMBOL(__sk_mem_schedule); 1745 1746/** 1747 * __sk_reclaim - reclaim memory_allocated 1748 * @sk: socket 1749 */ 1750void __sk_mem_reclaim(struct sock *sk) 1751{ 1752 struct proto *prot = sk->sk_prot; 1753 1754 atomic_long_sub(sk->sk_forward_alloc >> SK_MEM_QUANTUM_SHIFT, 1755 prot->memory_allocated); 1756 sk->sk_forward_alloc &= SK_MEM_QUANTUM - 1; 1757 1758 if (prot->memory_pressure && *prot->memory_pressure && 1759 (atomic_long_read(prot->memory_allocated) < prot->sysctl_mem[0])) 1760 *prot->memory_pressure = 0; 1761} 1762EXPORT_SYMBOL(__sk_mem_reclaim); 1763 1764 1765/* 1766 * Set of default routines for initialising struct proto_ops when 1767 * the protocol does not support a particular function. In certain 1768 * cases where it makes no sense for a protocol to have a "do nothing" 1769 * function, some default processing is provided. 1770 */ 1771 1772int sock_no_bind(struct socket *sock, struct sockaddr *saddr, int len) 1773{ 1774 return -EOPNOTSUPP; 1775} 1776EXPORT_SYMBOL(sock_no_bind); 1777 1778int sock_no_connect(struct socket *sock, struct sockaddr *saddr, 1779 int len, int flags) 1780{ 1781 return -EOPNOTSUPP; 1782} 1783EXPORT_SYMBOL(sock_no_connect); 1784 1785int sock_no_socketpair(struct socket *sock1, struct socket *sock2) 1786{ 1787 return -EOPNOTSUPP; 1788} 1789EXPORT_SYMBOL(sock_no_socketpair); 1790 1791int sock_no_accept(struct socket *sock, struct socket *newsock, int flags) 1792{ 1793 return -EOPNOTSUPP; 1794} 1795EXPORT_SYMBOL(sock_no_accept); 1796 1797int sock_no_getname(struct socket *sock, struct sockaddr *saddr, 1798 int *len, int peer) 1799{ 1800 return -EOPNOTSUPP; 1801} 1802EXPORT_SYMBOL(sock_no_getname); 1803 1804unsigned int sock_no_poll(struct file *file, struct socket *sock, poll_table *pt) 1805{ 1806 return 0; 1807} 1808EXPORT_SYMBOL(sock_no_poll); 1809 1810int sock_no_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg) 1811{ 1812 return -EOPNOTSUPP; 1813} 1814EXPORT_SYMBOL(sock_no_ioctl); 1815 1816int sock_no_listen(struct socket *sock, int backlog) 1817{ 1818 return -EOPNOTSUPP; 1819} 1820EXPORT_SYMBOL(sock_no_listen); 1821 1822int sock_no_shutdown(struct socket *sock, int how) 1823{ 1824 return -EOPNOTSUPP; 1825} 1826EXPORT_SYMBOL(sock_no_shutdown); 1827 1828int sock_no_setsockopt(struct socket *sock, int level, int optname, 1829 char __user *optval, unsigned int optlen) 1830{ 1831 return -EOPNOTSUPP; 1832} 1833EXPORT_SYMBOL(sock_no_setsockopt); 1834 1835int sock_no_getsockopt(struct socket *sock, int level, int optname, 1836 char __user *optval, int __user *optlen) 1837{ 1838 return -EOPNOTSUPP; 1839} 1840EXPORT_SYMBOL(sock_no_getsockopt); 1841 1842int sock_no_sendmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *m, 1843 size_t len) 1844{ 1845 return -EOPNOTSUPP; 1846} 1847EXPORT_SYMBOL(sock_no_sendmsg); 1848 1849int sock_no_recvmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *m, 1850 size_t len, int flags) 1851{ 1852 return -EOPNOTSUPP; 1853} 1854EXPORT_SYMBOL(sock_no_recvmsg); 1855 1856int sock_no_mmap(struct file *file, struct socket *sock, struct vm_area_struct *vma) 1857{ 1858 /* Mirror missing mmap method error code */ 1859 return -ENODEV; 1860} 1861EXPORT_SYMBOL(sock_no_mmap); 1862 1863ssize_t sock_no_sendpage(struct socket *sock, struct page *page, int offset, size_t size, int flags) 1864{ 1865 ssize_t res; 1866 struct msghdr msg = {.msg_flags = flags}; 1867 struct kvec iov; 1868 char *kaddr = kmap(page); 1869 iov.iov_base = kaddr + offset; 1870 iov.iov_len = size; 1871 res = kernel_sendmsg(sock, &msg, &iov, 1, size); 1872 kunmap(page); 1873 return res; 1874} 1875EXPORT_SYMBOL(sock_no_sendpage); 1876 1877/* 1878 * Default Socket Callbacks 1879 */ 1880 1881static void sock_def_wakeup(struct sock *sk) 1882{ 1883 struct socket_wq *wq; 1884 1885 rcu_read_lock(); 1886 wq = rcu_dereference(sk->sk_wq); 1887 if (wq_has_sleeper(wq)) 1888 wake_up_interruptible_all(&wq->wait); 1889 rcu_read_unlock(); 1890} 1891 1892static void sock_def_error_report(struct sock *sk) 1893{ 1894 struct socket_wq *wq; 1895 1896 rcu_read_lock(); 1897 wq = rcu_dereference(sk->sk_wq); 1898 if (wq_has_sleeper(wq)) 1899 wake_up_interruptible_poll(&wq->wait, POLLERR); 1900 sk_wake_async(sk, SOCK_WAKE_IO, POLL_ERR); 1901 rcu_read_unlock(); 1902} 1903 1904static void sock_def_readable(struct sock *sk, int len) 1905{ 1906 struct socket_wq *wq; 1907 1908 rcu_read_lock(); 1909 wq = rcu_dereference(sk->sk_wq); 1910 if (wq_has_sleeper(wq)) 1911 wake_up_interruptible_sync_poll(&wq->wait, POLLIN | POLLPRI | 1912 POLLRDNORM | POLLRDBAND); 1913 sk_wake_async(sk, SOCK_WAKE_WAITD, POLL_IN); 1914 rcu_read_unlock(); 1915} 1916 1917static void sock_def_write_space(struct sock *sk) 1918{ 1919 struct socket_wq *wq; 1920 1921 rcu_read_lock(); 1922 1923 /* Do not wake up a writer until he can make "significant" 1924 * progress. --DaveM 1925 */ 1926 if ((atomic_read(&sk->sk_wmem_alloc) << 1) <= sk->sk_sndbuf) { 1927 wq = rcu_dereference(sk->sk_wq); 1928 if (wq_has_sleeper(wq)) 1929 wake_up_interruptible_sync_poll(&wq->wait, POLLOUT | 1930 POLLWRNORM | POLLWRBAND); 1931 1932 /* Should agree with poll, otherwise some programs break */ 1933 if (sock_writeable(sk)) 1934 sk_wake_async(sk, SOCK_WAKE_SPACE, POLL_OUT); 1935 } 1936 1937 rcu_read_unlock(); 1938} 1939 1940static void sock_def_destruct(struct sock *sk) 1941{ 1942 kfree(sk->sk_protinfo); 1943} 1944 1945void sk_send_sigurg(struct sock *sk) 1946{ 1947 if (sk->sk_socket && sk->sk_socket->file) 1948 if (send_sigurg(&sk->sk_socket->file->f_owner)) 1949 sk_wake_async(sk, SOCK_WAKE_URG, POLL_PRI); 1950} 1951EXPORT_SYMBOL(sk_send_sigurg); 1952 1953void sk_reset_timer(struct sock *sk, struct timer_list* timer, 1954 unsigned long expires) 1955{ 1956 if (!mod_timer(timer, expires)) 1957 sock_hold(sk); 1958} 1959EXPORT_SYMBOL(sk_reset_timer); 1960 1961void sk_stop_timer(struct sock *sk, struct timer_list* timer) 1962{ 1963 if (timer_pending(timer) && del_timer(timer)) 1964 __sock_put(sk); 1965} 1966EXPORT_SYMBOL(sk_stop_timer); 1967 1968void sock_init_data(struct socket *sock, struct sock *sk) 1969{ 1970 skb_queue_head_init(&sk->sk_receive_queue); 1971 skb_queue_head_init(&sk->sk_write_queue); 1972 skb_queue_head_init(&sk->sk_error_queue); 1973#ifdef CONFIG_NET_DMA 1974 skb_queue_head_init(&sk->sk_async_wait_queue); 1975#endif 1976 1977 sk->sk_send_head = NULL; 1978 1979 init_timer(&sk->sk_timer); 1980 1981 sk->sk_allocation = GFP_KERNEL; 1982 sk->sk_rcvbuf = sysctl_rmem_default; 1983 sk->sk_sndbuf = sysctl_wmem_default; 1984 sk->sk_state = TCP_CLOSE; 1985 sk_set_socket(sk, sock); 1986 1987 sock_set_flag(sk, SOCK_ZAPPED); 1988 1989 if (sock) { 1990 sk->sk_type = sock->type; 1991 sk->sk_wq = sock->wq; 1992 sock->sk = sk; 1993 } else 1994 sk->sk_wq = NULL; 1995 1996 spin_lock_init(&sk->sk_dst_lock); 1997 rwlock_init(&sk->sk_callback_lock); 1998 lockdep_set_class_and_name(&sk->sk_callback_lock, 1999 af_callback_keys + sk->sk_family, 2000 af_family_clock_key_strings[sk->sk_family]); 2001 2002 sk->sk_state_change = sock_def_wakeup; 2003 sk->sk_data_ready = sock_def_readable; 2004 sk->sk_write_space = sock_def_write_space; 2005 sk->sk_error_report = sock_def_error_report; 2006 sk->sk_destruct = sock_def_destruct; 2007 2008 sk->sk_sndmsg_page = NULL; 2009 sk->sk_sndmsg_off = 0; 2010 2011 sk->sk_peer_pid = NULL; 2012 sk->sk_peer_cred = NULL; 2013 sk->sk_write_pending = 0; 2014 sk->sk_rcvlowat = 1; 2015 sk->sk_rcvtimeo = MAX_SCHEDULE_TIMEOUT; 2016 sk->sk_sndtimeo = MAX_SCHEDULE_TIMEOUT; 2017 2018 sk->sk_stamp = ktime_set(-1L, 0); 2019 2020 /* 2021 * Before updating sk_refcnt, we must commit prior changes to memory 2022 * (Documentation/RCU/rculist_nulls.txt for details) 2023 */ 2024 smp_wmb(); 2025 atomic_set(&sk->sk_refcnt, 1); 2026 atomic_set(&sk->sk_drops, 0); 2027} 2028EXPORT_SYMBOL(sock_init_data); 2029 2030void lock_sock_nested(struct sock *sk, int subclass) 2031{ 2032 might_sleep(); 2033 spin_lock_bh(&sk->sk_lock.slock); 2034 if (sk->sk_lock.owned) 2035 __lock_sock(sk); 2036 sk->sk_lock.owned = 1; 2037 spin_unlock(&sk->sk_lock.slock); 2038 /* 2039 * The sk_lock has mutex_lock() semantics here: 2040 */ 2041 mutex_acquire(&sk->sk_lock.dep_map, subclass, 0, _RET_IP_); 2042 local_bh_enable(); 2043} 2044EXPORT_SYMBOL(lock_sock_nested); 2045 2046void release_sock(struct sock *sk) 2047{ 2048 /* 2049 * The sk_lock has mutex_unlock() semantics: 2050 */ 2051 mutex_release(&sk->sk_lock.dep_map, 1, _RET_IP_); 2052 2053 spin_lock_bh(&sk->sk_lock.slock); 2054 if (sk->sk_backlog.tail) 2055 __release_sock(sk); 2056 sk->sk_lock.owned = 0; 2057 if (waitqueue_active(&sk->sk_lock.wq)) 2058 wake_up(&sk->sk_lock.wq); 2059 spin_unlock_bh(&sk->sk_lock.slock); 2060} 2061EXPORT_SYMBOL(release_sock); 2062 2063/** 2064 * lock_sock_fast - fast version of lock_sock 2065 * @sk: socket 2066 * 2067 * This version should be used for very small section, where process wont block 2068 * return false if fast path is taken 2069 * sk_lock.slock locked, owned = 0, BH disabled 2070 * return true if slow path is taken 2071 * sk_lock.slock unlocked, owned = 1, BH enabled 2072 */ 2073bool lock_sock_fast(struct sock *sk) 2074{ 2075 might_sleep(); 2076 spin_lock_bh(&sk->sk_lock.slock); 2077 2078 if (!sk->sk_lock.owned) 2079 /* 2080 * Note : We must disable BH 2081 */ 2082 return false; 2083 2084 __lock_sock(sk); 2085 sk->sk_lock.owned = 1; 2086 spin_unlock(&sk->sk_lock.slock); 2087 /* 2088 * The sk_lock has mutex_lock() semantics here: 2089 */ 2090 mutex_acquire(&sk->sk_lock.dep_map, 0, 0, _RET_IP_); 2091 local_bh_enable(); 2092 return true; 2093} 2094EXPORT_SYMBOL(lock_sock_fast); 2095 2096int sock_get_timestamp(struct sock *sk, struct timeval __user *userstamp) 2097{ 2098 struct timeval tv; 2099 if (!sock_flag(sk, SOCK_TIMESTAMP)) 2100 sock_enable_timestamp(sk, SOCK_TIMESTAMP); 2101 tv = ktime_to_timeval(sk->sk_stamp); 2102 if (tv.tv_sec == -1) 2103 return -ENOENT; 2104 if (tv.tv_sec == 0) { 2105 sk->sk_stamp = ktime_get_real(); 2106 tv = ktime_to_timeval(sk->sk_stamp); 2107 } 2108 return copy_to_user(userstamp, &tv, sizeof(tv)) ? -EFAULT : 0; 2109} 2110EXPORT_SYMBOL(sock_get_timestamp); 2111 2112int sock_get_timestampns(struct sock *sk, struct timespec __user *userstamp) 2113{ 2114 struct timespec ts; 2115 if (!sock_flag(sk, SOCK_TIMESTAMP)) 2116 sock_enable_timestamp(sk, SOCK_TIMESTAMP); 2117 ts = ktime_to_timespec(sk->sk_stamp); 2118 if (ts.tv_sec == -1) 2119 return -ENOENT; 2120 if (ts.tv_sec == 0) { 2121 sk->sk_stamp = ktime_get_real(); 2122 ts = ktime_to_timespec(sk->sk_stamp); 2123 } 2124 return copy_to_user(userstamp, &ts, sizeof(ts)) ? -EFAULT : 0; 2125} 2126EXPORT_SYMBOL(sock_get_timestampns); 2127 2128void sock_enable_timestamp(struct sock *sk, int flag) 2129{ 2130 if (!sock_flag(sk, flag)) { 2131 sock_set_flag(sk, flag); 2132 /* 2133 * we just set one of the two flags which require net 2134 * time stamping, but time stamping might have been on 2135 * already because of the other one 2136 */ 2137 if (!sock_flag(sk, 2138 flag == SOCK_TIMESTAMP ? 2139 SOCK_TIMESTAMPING_RX_SOFTWARE : 2140 SOCK_TIMESTAMP)) 2141 net_enable_timestamp(); 2142 } 2143} 2144 2145/* 2146 * Get a socket option on an socket. 2147 * 2148 * FIX: POSIX 1003.1g is very ambiguous here. It states that 2149 * asynchronous errors should be reported by getsockopt. We assume 2150 * this means if you specify SO_ERROR (otherwise whats the point of it). 2151 */ 2152int sock_common_getsockopt(struct socket *sock, int level, int optname, 2153 char __user *optval, int __user *optlen) 2154{ 2155 struct sock *sk = sock->sk; 2156 2157 return sk->sk_prot->getsockopt(sk, level, optname, optval, optlen); 2158} 2159EXPORT_SYMBOL(sock_common_getsockopt); 2160 2161#ifdef CONFIG_COMPAT 2162int compat_sock_common_getsockopt(struct socket *sock, int level, int optname, 2163 char __user *optval, int __user *optlen) 2164{ 2165 struct sock *sk = sock->sk; 2166 2167 if (sk->sk_prot->compat_getsockopt != NULL) 2168 return sk->sk_prot->compat_getsockopt(sk, level, optname, 2169 optval, optlen); 2170 return sk->sk_prot->getsockopt(sk, level, optname, optval, optlen); 2171} 2172EXPORT_SYMBOL(compat_sock_common_getsockopt); 2173#endif 2174 2175int sock_common_recvmsg(struct kiocb *iocb, struct socket *sock, 2176 struct msghdr *msg, size_t size, int flags) 2177{ 2178 struct sock *sk = sock->sk; 2179 int addr_len = 0; 2180 int err; 2181 2182 err = sk->sk_prot->recvmsg(iocb, sk, msg, size, flags & MSG_DONTWAIT, 2183 flags & ~MSG_DONTWAIT, &addr_len); 2184 if (err >= 0) 2185 msg->msg_namelen = addr_len; 2186 return err; 2187} 2188EXPORT_SYMBOL(sock_common_recvmsg); 2189 2190/* 2191 * Set socket options on an inet socket. 2192 */ 2193int sock_common_setsockopt(struct socket *sock, int level, int optname, 2194 char __user *optval, unsigned int optlen) 2195{ 2196 struct sock *sk = sock->sk; 2197 2198 return sk->sk_prot->setsockopt(sk, level, optname, optval, optlen); 2199} 2200EXPORT_SYMBOL(sock_common_setsockopt); 2201 2202#ifdef CONFIG_COMPAT 2203int compat_sock_common_setsockopt(struct socket *sock, int level, int optname, 2204 char __user *optval, unsigned int optlen) 2205{ 2206 struct sock *sk = sock->sk; 2207 2208 if (sk->sk_prot->compat_setsockopt != NULL) 2209 return sk->sk_prot->compat_setsockopt(sk, level, optname, 2210 optval, optlen); 2211 return sk->sk_prot->setsockopt(sk, level, optname, optval, optlen); 2212} 2213EXPORT_SYMBOL(compat_sock_common_setsockopt); 2214#endif 2215 2216void sk_common_release(struct sock *sk) 2217{ 2218 if (sk->sk_prot->destroy) 2219 sk->sk_prot->destroy(sk); 2220 2221 /* 2222 * Observation: when sock_common_release is called, processes have 2223 * no access to socket. But net still has. 2224 * Step one, detach it from networking: 2225 * 2226 * A. Remove from hash tables. 2227 */ 2228 2229 sk->sk_prot->unhash(sk); 2230 2231 /* 2232 * In this point socket cannot receive new packets, but it is possible 2233 * that some packets are in flight because some CPU runs receiver and 2234 * did hash table lookup before we unhashed socket. They will achieve 2235 * receive queue and will be purged by socket destructor. 2236 * 2237 * Also we still have packets pending on receive queue and probably, 2238 * our own packets waiting in device queues. sock_destroy will drain 2239 * receive queue, but transmitted packets will delay socket destruction 2240 * until the last reference will be released. 2241 */ 2242 2243 sock_orphan(sk); 2244 2245 xfrm_sk_free_policy(sk); 2246 2247 sk_refcnt_debug_release(sk); 2248 sock_put(sk); 2249} 2250EXPORT_SYMBOL(sk_common_release); 2251 2252static DEFINE_RWLOCK(proto_list_lock); 2253static LIST_HEAD(proto_list); 2254 2255#ifdef CONFIG_PROC_FS 2256#define PROTO_INUSE_NR 64 /* should be enough for the first time */ 2257struct prot_inuse { 2258 int val[PROTO_INUSE_NR]; 2259}; 2260 2261static DECLARE_BITMAP(proto_inuse_idx, PROTO_INUSE_NR); 2262 2263#ifdef CONFIG_NET_NS 2264void sock_prot_inuse_add(struct net *net, struct proto *prot, int val) 2265{ 2266 __this_cpu_add(net->core.inuse->val[prot->inuse_idx], val); 2267} 2268EXPORT_SYMBOL_GPL(sock_prot_inuse_add); 2269 2270int sock_prot_inuse_get(struct net *net, struct proto *prot) 2271{ 2272 int cpu, idx = prot->inuse_idx; 2273 int res = 0; 2274 2275 for_each_possible_cpu(cpu) 2276 res += per_cpu_ptr(net->core.inuse, cpu)->val[idx]; 2277 2278 return res >= 0 ? res : 0; 2279} 2280EXPORT_SYMBOL_GPL(sock_prot_inuse_get); 2281 2282static int __net_init sock_inuse_init_net(struct net *net) 2283{ 2284 net->core.inuse = alloc_percpu(struct prot_inuse); 2285 return net->core.inuse ? 0 : -ENOMEM; 2286} 2287 2288static void __net_exit sock_inuse_exit_net(struct net *net) 2289{ 2290 free_percpu(net->core.inuse); 2291} 2292 2293static struct pernet_operations net_inuse_ops = { 2294 .init = sock_inuse_init_net, 2295 .exit = sock_inuse_exit_net, 2296}; 2297 2298static __init int net_inuse_init(void) 2299{ 2300 if (register_pernet_subsys(&net_inuse_ops)) 2301 panic("Cannot initialize net inuse counters"); 2302 2303 return 0; 2304} 2305 2306core_initcall(net_inuse_init); 2307#else 2308static DEFINE_PER_CPU(struct prot_inuse, prot_inuse); 2309 2310void sock_prot_inuse_add(struct net *net, struct proto *prot, int val) 2311{ 2312 __this_cpu_add(prot_inuse.val[prot->inuse_idx], val); 2313} 2314EXPORT_SYMBOL_GPL(sock_prot_inuse_add); 2315 2316int sock_prot_inuse_get(struct net *net, struct proto *prot) 2317{ 2318 int cpu, idx = prot->inuse_idx; 2319 int res = 0; 2320 2321 for_each_possible_cpu(cpu) 2322 res += per_cpu(prot_inuse, cpu).val[idx]; 2323 2324 return res >= 0 ? res : 0; 2325} 2326EXPORT_SYMBOL_GPL(sock_prot_inuse_get); 2327#endif 2328 2329static void assign_proto_idx(struct proto *prot) 2330{ 2331 prot->inuse_idx = find_first_zero_bit(proto_inuse_idx, PROTO_INUSE_NR); 2332 2333 if (unlikely(prot->inuse_idx == PROTO_INUSE_NR - 1)) { 2334 printk(KERN_ERR "PROTO_INUSE_NR exhausted\n"); 2335 return; 2336 } 2337 2338 set_bit(prot->inuse_idx, proto_inuse_idx); 2339} 2340 2341static void release_proto_idx(struct proto *prot) 2342{ 2343 if (prot->inuse_idx != PROTO_INUSE_NR - 1) 2344 clear_bit(prot->inuse_idx, proto_inuse_idx); 2345} 2346#else 2347static inline void assign_proto_idx(struct proto *prot) 2348{ 2349} 2350 2351static inline void release_proto_idx(struct proto *prot) 2352{ 2353} 2354#endif 2355 2356int proto_register(struct proto *prot, int alloc_slab) 2357{ 2358 if (alloc_slab) { 2359 prot->slab = kmem_cache_create(prot->name, prot->obj_size, 0, 2360 SLAB_HWCACHE_ALIGN | prot->slab_flags, 2361 NULL); 2362 2363 if (prot->slab == NULL) { 2364 printk(KERN_CRIT "%s: Can't create sock SLAB cache!\n", 2365 prot->name); 2366 goto out; 2367 } 2368 2369 if (prot->rsk_prot != NULL) { 2370 prot->rsk_prot->slab_name = kasprintf(GFP_KERNEL, "request_sock_%s", prot->name); 2371 if (prot->rsk_prot->slab_name == NULL) 2372 goto out_free_sock_slab; 2373 2374 prot->rsk_prot->slab = kmem_cache_create(prot->rsk_prot->slab_name, 2375 prot->rsk_prot->obj_size, 0, 2376 SLAB_HWCACHE_ALIGN, NULL); 2377 2378 if (prot->rsk_prot->slab == NULL) { 2379 printk(KERN_CRIT "%s: Can't create request sock SLAB cache!\n", 2380 prot->name); 2381 goto out_free_request_sock_slab_name; 2382 } 2383 } 2384 2385 if (prot->twsk_prot != NULL) { 2386 prot->twsk_prot->twsk_slab_name = kasprintf(GFP_KERNEL, "tw_sock_%s", prot->name); 2387 2388 if (prot->twsk_prot->twsk_slab_name == NULL) 2389 goto out_free_request_sock_slab; 2390 2391 prot->twsk_prot->twsk_slab = 2392 kmem_cache_create(prot->twsk_prot->twsk_slab_name, 2393 prot->twsk_prot->twsk_obj_size, 2394 0, 2395 SLAB_HWCACHE_ALIGN | 2396 prot->slab_flags, 2397 NULL); 2398 if (prot->twsk_prot->twsk_slab == NULL) 2399 goto out_free_timewait_sock_slab_name; 2400 } 2401 } 2402 2403 write_lock(&proto_list_lock); 2404 list_add(&prot->node, &proto_list); 2405 assign_proto_idx(prot); 2406 write_unlock(&proto_list_lock); 2407 return 0; 2408 2409out_free_timewait_sock_slab_name: 2410 kfree(prot->twsk_prot->twsk_slab_name); 2411out_free_request_sock_slab: 2412 if (prot->rsk_prot && prot->rsk_prot->slab) { 2413 kmem_cache_destroy(prot->rsk_prot->slab); 2414 prot->rsk_prot->slab = NULL; 2415 } 2416out_free_request_sock_slab_name: 2417 if (prot->rsk_prot) 2418 kfree(prot->rsk_prot->slab_name); 2419out_free_sock_slab: 2420 kmem_cache_destroy(prot->slab); 2421 prot->slab = NULL; 2422out: 2423 return -ENOBUFS; 2424} 2425EXPORT_SYMBOL(proto_register); 2426 2427void proto_unregister(struct proto *prot) 2428{ 2429 write_lock(&proto_list_lock); 2430 release_proto_idx(prot); 2431 list_del(&prot->node); 2432 write_unlock(&proto_list_lock); 2433 2434 if (prot->slab != NULL) { 2435 kmem_cache_destroy(prot->slab); 2436 prot->slab = NULL; 2437 } 2438 2439 if (prot->rsk_prot != NULL && prot->rsk_prot->slab != NULL) { 2440 kmem_cache_destroy(prot->rsk_prot->slab); 2441 kfree(prot->rsk_prot->slab_name); 2442 prot->rsk_prot->slab = NULL; 2443 } 2444 2445 if (prot->twsk_prot != NULL && prot->twsk_prot->twsk_slab != NULL) { 2446 kmem_cache_destroy(prot->twsk_prot->twsk_slab); 2447 kfree(prot->twsk_prot->twsk_slab_name); 2448 prot->twsk_prot->twsk_slab = NULL; 2449 } 2450} 2451EXPORT_SYMBOL(proto_unregister); 2452 2453#ifdef CONFIG_PROC_FS 2454static void *proto_seq_start(struct seq_file *seq, loff_t *pos) 2455 __acquires(proto_list_lock) 2456{ 2457 read_lock(&proto_list_lock); 2458 return seq_list_start_head(&proto_list, *pos); 2459} 2460 2461static void *proto_seq_next(struct seq_file *seq, void *v, loff_t *pos) 2462{ 2463 return seq_list_next(v, &proto_list, pos); 2464} 2465 2466static void proto_seq_stop(struct seq_file *seq, void *v) 2467 __releases(proto_list_lock) 2468{ 2469 read_unlock(&proto_list_lock); 2470} 2471 2472static char proto_method_implemented(const void *method) 2473{ 2474 return method == NULL ? 'n' : 'y'; 2475} 2476 2477static void proto_seq_printf(struct seq_file *seq, struct proto *proto) 2478{ 2479 seq_printf(seq, "%-9s %4u %6d %6ld %-3s %6u %-3s %-10s " 2480 "%2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c\n", 2481 proto->name, 2482 proto->obj_size, 2483 sock_prot_inuse_get(seq_file_net(seq), proto), 2484 proto->memory_allocated != NULL ? atomic_long_read(proto->memory_allocated) : -1L, 2485 proto->memory_pressure != NULL ? *proto->memory_pressure ? "yes" : "no" : "NI", 2486 proto->max_header, 2487 proto->slab == NULL ? "no" : "yes", 2488 module_name(proto->owner), 2489 proto_method_implemented(proto->close), 2490 proto_method_implemented(proto->connect), 2491 proto_method_implemented(proto->disconnect), 2492 proto_method_implemented(proto->accept), 2493 proto_method_implemented(proto->ioctl), 2494 proto_method_implemented(proto->init), 2495 proto_method_implemented(proto->destroy), 2496 proto_method_implemented(proto->shutdown), 2497 proto_method_implemented(proto->setsockopt), 2498 proto_method_implemented(proto->getsockopt), 2499 proto_method_implemented(proto->sendmsg), 2500 proto_method_implemented(proto->recvmsg), 2501 proto_method_implemented(proto->sendpage), 2502 proto_method_implemented(proto->bind), 2503 proto_method_implemented(proto->backlog_rcv), 2504 proto_method_implemented(proto->hash), 2505 proto_method_implemented(proto->unhash), 2506 proto_method_implemented(proto->get_port), 2507 proto_method_implemented(proto->enter_memory_pressure)); 2508} 2509 2510static int proto_seq_show(struct seq_file *seq, void *v) 2511{ 2512 if (v == &proto_list) 2513 seq_printf(seq, "%-9s %-4s %-8s %-6s %-5s %-7s %-4s %-10s %s", 2514 "protocol", 2515 "size", 2516 "sockets", 2517 "memory", 2518 "press", 2519 "maxhdr", 2520 "slab", 2521 "module", 2522 "cl co di ac io in de sh ss gs se re sp bi br ha uh gp em\n"); 2523 else 2524 proto_seq_printf(seq, list_entry(v, struct proto, node)); 2525 return 0; 2526} 2527 2528static const struct seq_operations proto_seq_ops = { 2529 .start = proto_seq_start, 2530 .next = proto_seq_next, 2531 .stop = proto_seq_stop, 2532 .show = proto_seq_show, 2533}; 2534 2535static int proto_seq_open(struct inode *inode, struct file *file) 2536{ 2537 return seq_open_net(inode, file, &proto_seq_ops, 2538 sizeof(struct seq_net_private)); 2539} 2540 2541static const struct file_operations proto_seq_fops = { 2542 .owner = THIS_MODULE, 2543 .open = proto_seq_open, 2544 .read = seq_read, 2545 .llseek = seq_lseek, 2546 .release = seq_release_net, 2547}; 2548 2549static __net_init int proto_init_net(struct net *net) 2550{ 2551 if (!proc_net_fops_create(net, "protocols", S_IRUGO, &proto_seq_fops)) 2552 return -ENOMEM; 2553 2554 return 0; 2555} 2556 2557static __net_exit void proto_exit_net(struct net *net) 2558{ 2559 proc_net_remove(net, "protocols"); 2560} 2561 2562 2563static __net_initdata struct pernet_operations proto_net_ops = { 2564 .init = proto_init_net, 2565 .exit = proto_exit_net, 2566}; 2567 2568static int __init proto_init(void) 2569{ 2570 return register_pernet_subsys(&proto_net_ops); 2571} 2572 2573subsys_initcall(proto_init); 2574 2575#endif /* PROC_FS */ 2576