sock.c revision 1144182a8757f2a1f909f0c592898aaaf80884fc
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" , 161 "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" , 177 "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" , 193 "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 ancilliary 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 */ 996static void sock_copy(struct sock *nsk, const struct sock *osk) 997{ 998#ifdef CONFIG_SECURITY_NETWORK 999 void *sptr = nsk->sk_security; 1000#endif 1001 BUILD_BUG_ON(offsetof(struct sock, sk_copy_start) != 1002 sizeof(osk->sk_node) + sizeof(osk->sk_refcnt) + 1003 sizeof(osk->sk_tx_queue_mapping)); 1004 memcpy(&nsk->sk_copy_start, &osk->sk_copy_start, 1005 osk->sk_prot->obj_size - offsetof(struct sock, sk_copy_start)); 1006#ifdef CONFIG_SECURITY_NETWORK 1007 nsk->sk_security = sptr; 1008 security_sk_clone(osk, nsk); 1009#endif 1010} 1011 1012static struct sock *sk_prot_alloc(struct proto *prot, gfp_t priority, 1013 int family) 1014{ 1015 struct sock *sk; 1016 struct kmem_cache *slab; 1017 1018 slab = prot->slab; 1019 if (slab != NULL) { 1020 sk = kmem_cache_alloc(slab, priority & ~__GFP_ZERO); 1021 if (!sk) 1022 return sk; 1023 if (priority & __GFP_ZERO) { 1024 /* 1025 * caches using SLAB_DESTROY_BY_RCU should let 1026 * sk_node.next un-modified. Special care is taken 1027 * when initializing object to zero. 1028 */ 1029 if (offsetof(struct sock, sk_node.next) != 0) 1030 memset(sk, 0, offsetof(struct sock, sk_node.next)); 1031 memset(&sk->sk_node.pprev, 0, 1032 prot->obj_size - offsetof(struct sock, 1033 sk_node.pprev)); 1034 } 1035 } 1036 else 1037 sk = kmalloc(prot->obj_size, priority); 1038 1039 if (sk != NULL) { 1040 kmemcheck_annotate_bitfield(sk, flags); 1041 1042 if (security_sk_alloc(sk, family, priority)) 1043 goto out_free; 1044 1045 if (!try_module_get(prot->owner)) 1046 goto out_free_sec; 1047 sk_tx_queue_clear(sk); 1048 } 1049 1050 return sk; 1051 1052out_free_sec: 1053 security_sk_free(sk); 1054out_free: 1055 if (slab != NULL) 1056 kmem_cache_free(slab, sk); 1057 else 1058 kfree(sk); 1059 return NULL; 1060} 1061 1062static void sk_prot_free(struct proto *prot, struct sock *sk) 1063{ 1064 struct kmem_cache *slab; 1065 struct module *owner; 1066 1067 owner = prot->owner; 1068 slab = prot->slab; 1069 1070 security_sk_free(sk); 1071 if (slab != NULL) 1072 kmem_cache_free(slab, sk); 1073 else 1074 kfree(sk); 1075 module_put(owner); 1076} 1077 1078#ifdef CONFIG_CGROUPS 1079void sock_update_classid(struct sock *sk) 1080{ 1081 u32 classid; 1082 1083 rcu_read_lock(); /* doing current task, which cannot vanish. */ 1084 classid = task_cls_classid(current); 1085 rcu_read_unlock(); 1086 if (classid && classid != sk->sk_classid) 1087 sk->sk_classid = classid; 1088} 1089EXPORT_SYMBOL(sock_update_classid); 1090#endif 1091 1092/** 1093 * sk_alloc - All socket objects are allocated here 1094 * @net: the applicable net namespace 1095 * @family: protocol family 1096 * @priority: for allocation (%GFP_KERNEL, %GFP_ATOMIC, etc) 1097 * @prot: struct proto associated with this new sock instance 1098 */ 1099struct sock *sk_alloc(struct net *net, int family, gfp_t priority, 1100 struct proto *prot) 1101{ 1102 struct sock *sk; 1103 1104 sk = sk_prot_alloc(prot, priority | __GFP_ZERO, family); 1105 if (sk) { 1106 sk->sk_family = family; 1107 /* 1108 * See comment in struct sock definition to understand 1109 * why we need sk_prot_creator -acme 1110 */ 1111 sk->sk_prot = sk->sk_prot_creator = prot; 1112 sock_lock_init(sk); 1113 sock_net_set(sk, get_net(net)); 1114 atomic_set(&sk->sk_wmem_alloc, 1); 1115 1116 sock_update_classid(sk); 1117 } 1118 1119 return sk; 1120} 1121EXPORT_SYMBOL(sk_alloc); 1122 1123static void __sk_free(struct sock *sk) 1124{ 1125 struct sk_filter *filter; 1126 1127 if (sk->sk_destruct) 1128 sk->sk_destruct(sk); 1129 1130 filter = rcu_dereference_check(sk->sk_filter, 1131 atomic_read(&sk->sk_wmem_alloc) == 0); 1132 if (filter) { 1133 sk_filter_uncharge(sk, filter); 1134 rcu_assign_pointer(sk->sk_filter, NULL); 1135 } 1136 1137 sock_disable_timestamp(sk, SOCK_TIMESTAMP); 1138 sock_disable_timestamp(sk, SOCK_TIMESTAMPING_RX_SOFTWARE); 1139 1140 if (atomic_read(&sk->sk_omem_alloc)) 1141 printk(KERN_DEBUG "%s: optmem leakage (%d bytes) detected.\n", 1142 __func__, atomic_read(&sk->sk_omem_alloc)); 1143 1144 if (sk->sk_peer_cred) 1145 put_cred(sk->sk_peer_cred); 1146 put_pid(sk->sk_peer_pid); 1147 put_net(sock_net(sk)); 1148 sk_prot_free(sk->sk_prot_creator, sk); 1149} 1150 1151void sk_free(struct sock *sk) 1152{ 1153 /* 1154 * We substract one from sk_wmem_alloc and can know if 1155 * some packets are still in some tx queue. 1156 * If not null, sock_wfree() will call __sk_free(sk) later 1157 */ 1158 if (atomic_dec_and_test(&sk->sk_wmem_alloc)) 1159 __sk_free(sk); 1160} 1161EXPORT_SYMBOL(sk_free); 1162 1163/* 1164 * Last sock_put should drop referrence to sk->sk_net. It has already 1165 * been dropped in sk_change_net. Taking referrence to stopping namespace 1166 * is not an option. 1167 * Take referrence to a socket to remove it from hash _alive_ and after that 1168 * destroy it in the context of init_net. 1169 */ 1170void sk_release_kernel(struct sock *sk) 1171{ 1172 if (sk == NULL || sk->sk_socket == NULL) 1173 return; 1174 1175 sock_hold(sk); 1176 sock_release(sk->sk_socket); 1177 release_net(sock_net(sk)); 1178 sock_net_set(sk, get_net(&init_net)); 1179 sock_put(sk); 1180} 1181EXPORT_SYMBOL(sk_release_kernel); 1182 1183struct sock *sk_clone(const struct sock *sk, const gfp_t priority) 1184{ 1185 struct sock *newsk; 1186 1187 newsk = sk_prot_alloc(sk->sk_prot, priority, sk->sk_family); 1188 if (newsk != NULL) { 1189 struct sk_filter *filter; 1190 1191 sock_copy(newsk, sk); 1192 1193 /* SANITY */ 1194 get_net(sock_net(newsk)); 1195 sk_node_init(&newsk->sk_node); 1196 sock_lock_init(newsk); 1197 bh_lock_sock(newsk); 1198 newsk->sk_backlog.head = newsk->sk_backlog.tail = NULL; 1199 newsk->sk_backlog.len = 0; 1200 1201 atomic_set(&newsk->sk_rmem_alloc, 0); 1202 /* 1203 * sk_wmem_alloc set to one (see sk_free() and sock_wfree()) 1204 */ 1205 atomic_set(&newsk->sk_wmem_alloc, 1); 1206 atomic_set(&newsk->sk_omem_alloc, 0); 1207 skb_queue_head_init(&newsk->sk_receive_queue); 1208 skb_queue_head_init(&newsk->sk_write_queue); 1209#ifdef CONFIG_NET_DMA 1210 skb_queue_head_init(&newsk->sk_async_wait_queue); 1211#endif 1212 1213 spin_lock_init(&newsk->sk_dst_lock); 1214 rwlock_init(&newsk->sk_callback_lock); 1215 lockdep_set_class_and_name(&newsk->sk_callback_lock, 1216 af_callback_keys + newsk->sk_family, 1217 af_family_clock_key_strings[newsk->sk_family]); 1218 1219 newsk->sk_dst_cache = NULL; 1220 newsk->sk_wmem_queued = 0; 1221 newsk->sk_forward_alloc = 0; 1222 newsk->sk_send_head = NULL; 1223 newsk->sk_userlocks = sk->sk_userlocks & ~SOCK_BINDPORT_LOCK; 1224 1225 sock_reset_flag(newsk, SOCK_DONE); 1226 skb_queue_head_init(&newsk->sk_error_queue); 1227 1228 filter = newsk->sk_filter; 1229 if (filter != NULL) 1230 sk_filter_charge(newsk, filter); 1231 1232 if (unlikely(xfrm_sk_clone_policy(newsk))) { 1233 /* It is still raw copy of parent, so invalidate 1234 * destructor and make plain sk_free() */ 1235 newsk->sk_destruct = NULL; 1236 sk_free(newsk); 1237 newsk = NULL; 1238 goto out; 1239 } 1240 1241 newsk->sk_err = 0; 1242 newsk->sk_priority = 0; 1243 /* 1244 * Before updating sk_refcnt, we must commit prior changes to memory 1245 * (Documentation/RCU/rculist_nulls.txt for details) 1246 */ 1247 smp_wmb(); 1248 atomic_set(&newsk->sk_refcnt, 2); 1249 1250 /* 1251 * Increment the counter in the same struct proto as the master 1252 * sock (sk_refcnt_debug_inc uses newsk->sk_prot->socks, that 1253 * is the same as sk->sk_prot->socks, as this field was copied 1254 * with memcpy). 1255 * 1256 * This _changes_ the previous behaviour, where 1257 * tcp_create_openreq_child always was incrementing the 1258 * equivalent to tcp_prot->socks (inet_sock_nr), so this have 1259 * to be taken into account in all callers. -acme 1260 */ 1261 sk_refcnt_debug_inc(newsk); 1262 sk_set_socket(newsk, NULL); 1263 newsk->sk_wq = NULL; 1264 1265 if (newsk->sk_prot->sockets_allocated) 1266 percpu_counter_inc(newsk->sk_prot->sockets_allocated); 1267 1268 if (sock_flag(newsk, SOCK_TIMESTAMP) || 1269 sock_flag(newsk, SOCK_TIMESTAMPING_RX_SOFTWARE)) 1270 net_enable_timestamp(); 1271 } 1272out: 1273 return newsk; 1274} 1275EXPORT_SYMBOL_GPL(sk_clone); 1276 1277void sk_setup_caps(struct sock *sk, struct dst_entry *dst) 1278{ 1279 __sk_dst_set(sk, dst); 1280 sk->sk_route_caps = dst->dev->features; 1281 if (sk->sk_route_caps & NETIF_F_GSO) 1282 sk->sk_route_caps |= NETIF_F_GSO_SOFTWARE; 1283 sk->sk_route_caps &= ~sk->sk_route_nocaps; 1284 if (sk_can_gso(sk)) { 1285 if (dst->header_len) { 1286 sk->sk_route_caps &= ~NETIF_F_GSO_MASK; 1287 } else { 1288 sk->sk_route_caps |= NETIF_F_SG | NETIF_F_HW_CSUM; 1289 sk->sk_gso_max_size = dst->dev->gso_max_size; 1290 } 1291 } 1292} 1293EXPORT_SYMBOL_GPL(sk_setup_caps); 1294 1295void __init sk_init(void) 1296{ 1297 if (totalram_pages <= 4096) { 1298 sysctl_wmem_max = 32767; 1299 sysctl_rmem_max = 32767; 1300 sysctl_wmem_default = 32767; 1301 sysctl_rmem_default = 32767; 1302 } else if (totalram_pages >= 131072) { 1303 sysctl_wmem_max = 131071; 1304 sysctl_rmem_max = 131071; 1305 } 1306} 1307 1308/* 1309 * Simple resource managers for sockets. 1310 */ 1311 1312 1313/* 1314 * Write buffer destructor automatically called from kfree_skb. 1315 */ 1316void sock_wfree(struct sk_buff *skb) 1317{ 1318 struct sock *sk = skb->sk; 1319 unsigned int len = skb->truesize; 1320 1321 if (!sock_flag(sk, SOCK_USE_WRITE_QUEUE)) { 1322 /* 1323 * Keep a reference on sk_wmem_alloc, this will be released 1324 * after sk_write_space() call 1325 */ 1326 atomic_sub(len - 1, &sk->sk_wmem_alloc); 1327 sk->sk_write_space(sk); 1328 len = 1; 1329 } 1330 /* 1331 * if sk_wmem_alloc reaches 0, we must finish what sk_free() 1332 * could not do because of in-flight packets 1333 */ 1334 if (atomic_sub_and_test(len, &sk->sk_wmem_alloc)) 1335 __sk_free(sk); 1336} 1337EXPORT_SYMBOL(sock_wfree); 1338 1339/* 1340 * Read buffer destructor automatically called from kfree_skb. 1341 */ 1342void sock_rfree(struct sk_buff *skb) 1343{ 1344 struct sock *sk = skb->sk; 1345 unsigned int len = skb->truesize; 1346 1347 atomic_sub(len, &sk->sk_rmem_alloc); 1348 sk_mem_uncharge(sk, len); 1349} 1350EXPORT_SYMBOL(sock_rfree); 1351 1352 1353int sock_i_uid(struct sock *sk) 1354{ 1355 int uid; 1356 1357 read_lock_bh(&sk->sk_callback_lock); 1358 uid = sk->sk_socket ? SOCK_INODE(sk->sk_socket)->i_uid : 0; 1359 read_unlock_bh(&sk->sk_callback_lock); 1360 return uid; 1361} 1362EXPORT_SYMBOL(sock_i_uid); 1363 1364unsigned long sock_i_ino(struct sock *sk) 1365{ 1366 unsigned long ino; 1367 1368 read_lock_bh(&sk->sk_callback_lock); 1369 ino = sk->sk_socket ? SOCK_INODE(sk->sk_socket)->i_ino : 0; 1370 read_unlock_bh(&sk->sk_callback_lock); 1371 return ino; 1372} 1373EXPORT_SYMBOL(sock_i_ino); 1374 1375/* 1376 * Allocate a skb from the socket's send buffer. 1377 */ 1378struct sk_buff *sock_wmalloc(struct sock *sk, unsigned long size, int force, 1379 gfp_t priority) 1380{ 1381 if (force || atomic_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf) { 1382 struct sk_buff *skb = alloc_skb(size, priority); 1383 if (skb) { 1384 skb_set_owner_w(skb, sk); 1385 return skb; 1386 } 1387 } 1388 return NULL; 1389} 1390EXPORT_SYMBOL(sock_wmalloc); 1391 1392/* 1393 * Allocate a skb from the socket's receive buffer. 1394 */ 1395struct sk_buff *sock_rmalloc(struct sock *sk, unsigned long size, int force, 1396 gfp_t priority) 1397{ 1398 if (force || atomic_read(&sk->sk_rmem_alloc) < sk->sk_rcvbuf) { 1399 struct sk_buff *skb = alloc_skb(size, priority); 1400 if (skb) { 1401 skb_set_owner_r(skb, sk); 1402 return skb; 1403 } 1404 } 1405 return NULL; 1406} 1407 1408/* 1409 * Allocate a memory block from the socket's option memory buffer. 1410 */ 1411void *sock_kmalloc(struct sock *sk, int size, gfp_t priority) 1412{ 1413 if ((unsigned)size <= sysctl_optmem_max && 1414 atomic_read(&sk->sk_omem_alloc) + size < sysctl_optmem_max) { 1415 void *mem; 1416 /* First do the add, to avoid the race if kmalloc 1417 * might sleep. 1418 */ 1419 atomic_add(size, &sk->sk_omem_alloc); 1420 mem = kmalloc(size, priority); 1421 if (mem) 1422 return mem; 1423 atomic_sub(size, &sk->sk_omem_alloc); 1424 } 1425 return NULL; 1426} 1427EXPORT_SYMBOL(sock_kmalloc); 1428 1429/* 1430 * Free an option memory block. 1431 */ 1432void sock_kfree_s(struct sock *sk, void *mem, int size) 1433{ 1434 kfree(mem); 1435 atomic_sub(size, &sk->sk_omem_alloc); 1436} 1437EXPORT_SYMBOL(sock_kfree_s); 1438 1439/* It is almost wait_for_tcp_memory minus release_sock/lock_sock. 1440 I think, these locks should be removed for datagram sockets. 1441 */ 1442static long sock_wait_for_wmem(struct sock *sk, long timeo) 1443{ 1444 DEFINE_WAIT(wait); 1445 1446 clear_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags); 1447 for (;;) { 1448 if (!timeo) 1449 break; 1450 if (signal_pending(current)) 1451 break; 1452 set_bit(SOCK_NOSPACE, &sk->sk_socket->flags); 1453 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE); 1454 if (atomic_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf) 1455 break; 1456 if (sk->sk_shutdown & SEND_SHUTDOWN) 1457 break; 1458 if (sk->sk_err) 1459 break; 1460 timeo = schedule_timeout(timeo); 1461 } 1462 finish_wait(sk_sleep(sk), &wait); 1463 return timeo; 1464} 1465 1466 1467/* 1468 * Generic send/receive buffer handlers 1469 */ 1470 1471struct sk_buff *sock_alloc_send_pskb(struct sock *sk, unsigned long header_len, 1472 unsigned long data_len, int noblock, 1473 int *errcode) 1474{ 1475 struct sk_buff *skb; 1476 gfp_t gfp_mask; 1477 long timeo; 1478 int err; 1479 1480 gfp_mask = sk->sk_allocation; 1481 if (gfp_mask & __GFP_WAIT) 1482 gfp_mask |= __GFP_REPEAT; 1483 1484 timeo = sock_sndtimeo(sk, noblock); 1485 while (1) { 1486 err = sock_error(sk); 1487 if (err != 0) 1488 goto failure; 1489 1490 err = -EPIPE; 1491 if (sk->sk_shutdown & SEND_SHUTDOWN) 1492 goto failure; 1493 1494 if (atomic_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf) { 1495 skb = alloc_skb(header_len, gfp_mask); 1496 if (skb) { 1497 int npages; 1498 int i; 1499 1500 /* No pages, we're done... */ 1501 if (!data_len) 1502 break; 1503 1504 npages = (data_len + (PAGE_SIZE - 1)) >> PAGE_SHIFT; 1505 skb->truesize += data_len; 1506 skb_shinfo(skb)->nr_frags = npages; 1507 for (i = 0; i < npages; i++) { 1508 struct page *page; 1509 skb_frag_t *frag; 1510 1511 page = alloc_pages(sk->sk_allocation, 0); 1512 if (!page) { 1513 err = -ENOBUFS; 1514 skb_shinfo(skb)->nr_frags = i; 1515 kfree_skb(skb); 1516 goto failure; 1517 } 1518 1519 frag = &skb_shinfo(skb)->frags[i]; 1520 frag->page = page; 1521 frag->page_offset = 0; 1522 frag->size = (data_len >= PAGE_SIZE ? 1523 PAGE_SIZE : 1524 data_len); 1525 data_len -= PAGE_SIZE; 1526 } 1527 1528 /* Full success... */ 1529 break; 1530 } 1531 err = -ENOBUFS; 1532 goto failure; 1533 } 1534 set_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags); 1535 set_bit(SOCK_NOSPACE, &sk->sk_socket->flags); 1536 err = -EAGAIN; 1537 if (!timeo) 1538 goto failure; 1539 if (signal_pending(current)) 1540 goto interrupted; 1541 timeo = sock_wait_for_wmem(sk, timeo); 1542 } 1543 1544 skb_set_owner_w(skb, sk); 1545 return skb; 1546 1547interrupted: 1548 err = sock_intr_errno(timeo); 1549failure: 1550 *errcode = err; 1551 return NULL; 1552} 1553EXPORT_SYMBOL(sock_alloc_send_pskb); 1554 1555struct sk_buff *sock_alloc_send_skb(struct sock *sk, unsigned long size, 1556 int noblock, int *errcode) 1557{ 1558 return sock_alloc_send_pskb(sk, size, 0, noblock, errcode); 1559} 1560EXPORT_SYMBOL(sock_alloc_send_skb); 1561 1562static void __lock_sock(struct sock *sk) 1563{ 1564 DEFINE_WAIT(wait); 1565 1566 for (;;) { 1567 prepare_to_wait_exclusive(&sk->sk_lock.wq, &wait, 1568 TASK_UNINTERRUPTIBLE); 1569 spin_unlock_bh(&sk->sk_lock.slock); 1570 schedule(); 1571 spin_lock_bh(&sk->sk_lock.slock); 1572 if (!sock_owned_by_user(sk)) 1573 break; 1574 } 1575 finish_wait(&sk->sk_lock.wq, &wait); 1576} 1577 1578static void __release_sock(struct sock *sk) 1579{ 1580 struct sk_buff *skb = sk->sk_backlog.head; 1581 1582 do { 1583 sk->sk_backlog.head = sk->sk_backlog.tail = NULL; 1584 bh_unlock_sock(sk); 1585 1586 do { 1587 struct sk_buff *next = skb->next; 1588 1589 WARN_ON_ONCE(skb_dst_is_noref(skb)); 1590 skb->next = NULL; 1591 sk_backlog_rcv(sk, skb); 1592 1593 /* 1594 * We are in process context here with softirqs 1595 * disabled, use cond_resched_softirq() to preempt. 1596 * This is safe to do because we've taken the backlog 1597 * queue private: 1598 */ 1599 cond_resched_softirq(); 1600 1601 skb = next; 1602 } while (skb != NULL); 1603 1604 bh_lock_sock(sk); 1605 } while ((skb = sk->sk_backlog.head) != NULL); 1606 1607 /* 1608 * Doing the zeroing here guarantee we can not loop forever 1609 * while a wild producer attempts to flood us. 1610 */ 1611 sk->sk_backlog.len = 0; 1612} 1613 1614/** 1615 * sk_wait_data - wait for data to arrive at sk_receive_queue 1616 * @sk: sock to wait on 1617 * @timeo: for how long 1618 * 1619 * Now socket state including sk->sk_err is changed only under lock, 1620 * hence we may omit checks after joining wait queue. 1621 * We check receive queue before schedule() only as optimization; 1622 * it is very likely that release_sock() added new data. 1623 */ 1624int sk_wait_data(struct sock *sk, long *timeo) 1625{ 1626 int rc; 1627 DEFINE_WAIT(wait); 1628 1629 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE); 1630 set_bit(SOCK_ASYNC_WAITDATA, &sk->sk_socket->flags); 1631 rc = sk_wait_event(sk, timeo, !skb_queue_empty(&sk->sk_receive_queue)); 1632 clear_bit(SOCK_ASYNC_WAITDATA, &sk->sk_socket->flags); 1633 finish_wait(sk_sleep(sk), &wait); 1634 return rc; 1635} 1636EXPORT_SYMBOL(sk_wait_data); 1637 1638/** 1639 * __sk_mem_schedule - increase sk_forward_alloc and memory_allocated 1640 * @sk: socket 1641 * @size: memory size to allocate 1642 * @kind: allocation type 1643 * 1644 * If kind is SK_MEM_SEND, it means wmem allocation. Otherwise it means 1645 * rmem allocation. This function assumes that protocols which have 1646 * memory_pressure use sk_wmem_queued as write buffer accounting. 1647 */ 1648int __sk_mem_schedule(struct sock *sk, int size, int kind) 1649{ 1650 struct proto *prot = sk->sk_prot; 1651 int amt = sk_mem_pages(size); 1652 int allocated; 1653 1654 sk->sk_forward_alloc += amt * SK_MEM_QUANTUM; 1655 allocated = atomic_add_return(amt, prot->memory_allocated); 1656 1657 /* Under limit. */ 1658 if (allocated <= prot->sysctl_mem[0]) { 1659 if (prot->memory_pressure && *prot->memory_pressure) 1660 *prot->memory_pressure = 0; 1661 return 1; 1662 } 1663 1664 /* Under pressure. */ 1665 if (allocated > prot->sysctl_mem[1]) 1666 if (prot->enter_memory_pressure) 1667 prot->enter_memory_pressure(sk); 1668 1669 /* Over hard limit. */ 1670 if (allocated > prot->sysctl_mem[2]) 1671 goto suppress_allocation; 1672 1673 /* guarantee minimum buffer size under pressure */ 1674 if (kind == SK_MEM_RECV) { 1675 if (atomic_read(&sk->sk_rmem_alloc) < prot->sysctl_rmem[0]) 1676 return 1; 1677 } else { /* SK_MEM_SEND */ 1678 if (sk->sk_type == SOCK_STREAM) { 1679 if (sk->sk_wmem_queued < prot->sysctl_wmem[0]) 1680 return 1; 1681 } else if (atomic_read(&sk->sk_wmem_alloc) < 1682 prot->sysctl_wmem[0]) 1683 return 1; 1684 } 1685 1686 if (prot->memory_pressure) { 1687 int alloc; 1688 1689 if (!*prot->memory_pressure) 1690 return 1; 1691 alloc = percpu_counter_read_positive(prot->sockets_allocated); 1692 if (prot->sysctl_mem[2] > alloc * 1693 sk_mem_pages(sk->sk_wmem_queued + 1694 atomic_read(&sk->sk_rmem_alloc) + 1695 sk->sk_forward_alloc)) 1696 return 1; 1697 } 1698 1699suppress_allocation: 1700 1701 if (kind == SK_MEM_SEND && sk->sk_type == SOCK_STREAM) { 1702 sk_stream_moderate_sndbuf(sk); 1703 1704 /* Fail only if socket is _under_ its sndbuf. 1705 * In this case we cannot block, so that we have to fail. 1706 */ 1707 if (sk->sk_wmem_queued + size >= sk->sk_sndbuf) 1708 return 1; 1709 } 1710 1711 /* Alas. Undo changes. */ 1712 sk->sk_forward_alloc -= amt * SK_MEM_QUANTUM; 1713 atomic_sub(amt, prot->memory_allocated); 1714 return 0; 1715} 1716EXPORT_SYMBOL(__sk_mem_schedule); 1717 1718/** 1719 * __sk_reclaim - reclaim memory_allocated 1720 * @sk: socket 1721 */ 1722void __sk_mem_reclaim(struct sock *sk) 1723{ 1724 struct proto *prot = sk->sk_prot; 1725 1726 atomic_sub(sk->sk_forward_alloc >> SK_MEM_QUANTUM_SHIFT, 1727 prot->memory_allocated); 1728 sk->sk_forward_alloc &= SK_MEM_QUANTUM - 1; 1729 1730 if (prot->memory_pressure && *prot->memory_pressure && 1731 (atomic_read(prot->memory_allocated) < prot->sysctl_mem[0])) 1732 *prot->memory_pressure = 0; 1733} 1734EXPORT_SYMBOL(__sk_mem_reclaim); 1735 1736 1737/* 1738 * Set of default routines for initialising struct proto_ops when 1739 * the protocol does not support a particular function. In certain 1740 * cases where it makes no sense for a protocol to have a "do nothing" 1741 * function, some default processing is provided. 1742 */ 1743 1744int sock_no_bind(struct socket *sock, struct sockaddr *saddr, int len) 1745{ 1746 return -EOPNOTSUPP; 1747} 1748EXPORT_SYMBOL(sock_no_bind); 1749 1750int sock_no_connect(struct socket *sock, struct sockaddr *saddr, 1751 int len, int flags) 1752{ 1753 return -EOPNOTSUPP; 1754} 1755EXPORT_SYMBOL(sock_no_connect); 1756 1757int sock_no_socketpair(struct socket *sock1, struct socket *sock2) 1758{ 1759 return -EOPNOTSUPP; 1760} 1761EXPORT_SYMBOL(sock_no_socketpair); 1762 1763int sock_no_accept(struct socket *sock, struct socket *newsock, int flags) 1764{ 1765 return -EOPNOTSUPP; 1766} 1767EXPORT_SYMBOL(sock_no_accept); 1768 1769int sock_no_getname(struct socket *sock, struct sockaddr *saddr, 1770 int *len, int peer) 1771{ 1772 return -EOPNOTSUPP; 1773} 1774EXPORT_SYMBOL(sock_no_getname); 1775 1776unsigned int sock_no_poll(struct file *file, struct socket *sock, poll_table *pt) 1777{ 1778 return 0; 1779} 1780EXPORT_SYMBOL(sock_no_poll); 1781 1782int sock_no_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg) 1783{ 1784 return -EOPNOTSUPP; 1785} 1786EXPORT_SYMBOL(sock_no_ioctl); 1787 1788int sock_no_listen(struct socket *sock, int backlog) 1789{ 1790 return -EOPNOTSUPP; 1791} 1792EXPORT_SYMBOL(sock_no_listen); 1793 1794int sock_no_shutdown(struct socket *sock, int how) 1795{ 1796 return -EOPNOTSUPP; 1797} 1798EXPORT_SYMBOL(sock_no_shutdown); 1799 1800int sock_no_setsockopt(struct socket *sock, int level, int optname, 1801 char __user *optval, unsigned int optlen) 1802{ 1803 return -EOPNOTSUPP; 1804} 1805EXPORT_SYMBOL(sock_no_setsockopt); 1806 1807int sock_no_getsockopt(struct socket *sock, int level, int optname, 1808 char __user *optval, int __user *optlen) 1809{ 1810 return -EOPNOTSUPP; 1811} 1812EXPORT_SYMBOL(sock_no_getsockopt); 1813 1814int sock_no_sendmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *m, 1815 size_t len) 1816{ 1817 return -EOPNOTSUPP; 1818} 1819EXPORT_SYMBOL(sock_no_sendmsg); 1820 1821int sock_no_recvmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *m, 1822 size_t len, int flags) 1823{ 1824 return -EOPNOTSUPP; 1825} 1826EXPORT_SYMBOL(sock_no_recvmsg); 1827 1828int sock_no_mmap(struct file *file, struct socket *sock, struct vm_area_struct *vma) 1829{ 1830 /* Mirror missing mmap method error code */ 1831 return -ENODEV; 1832} 1833EXPORT_SYMBOL(sock_no_mmap); 1834 1835ssize_t sock_no_sendpage(struct socket *sock, struct page *page, int offset, size_t size, int flags) 1836{ 1837 ssize_t res; 1838 struct msghdr msg = {.msg_flags = flags}; 1839 struct kvec iov; 1840 char *kaddr = kmap(page); 1841 iov.iov_base = kaddr + offset; 1842 iov.iov_len = size; 1843 res = kernel_sendmsg(sock, &msg, &iov, 1, size); 1844 kunmap(page); 1845 return res; 1846} 1847EXPORT_SYMBOL(sock_no_sendpage); 1848 1849/* 1850 * Default Socket Callbacks 1851 */ 1852 1853static void sock_def_wakeup(struct sock *sk) 1854{ 1855 struct socket_wq *wq; 1856 1857 rcu_read_lock(); 1858 wq = rcu_dereference(sk->sk_wq); 1859 if (wq_has_sleeper(wq)) 1860 wake_up_interruptible_all(&wq->wait); 1861 rcu_read_unlock(); 1862} 1863 1864static void sock_def_error_report(struct sock *sk) 1865{ 1866 struct socket_wq *wq; 1867 1868 rcu_read_lock(); 1869 wq = rcu_dereference(sk->sk_wq); 1870 if (wq_has_sleeper(wq)) 1871 wake_up_interruptible_poll(&wq->wait, POLLERR); 1872 sk_wake_async(sk, SOCK_WAKE_IO, POLL_ERR); 1873 rcu_read_unlock(); 1874} 1875 1876static void sock_def_readable(struct sock *sk, int len) 1877{ 1878 struct socket_wq *wq; 1879 1880 rcu_read_lock(); 1881 wq = rcu_dereference(sk->sk_wq); 1882 if (wq_has_sleeper(wq)) 1883 wake_up_interruptible_sync_poll(&wq->wait, POLLIN | 1884 POLLRDNORM | POLLRDBAND); 1885 sk_wake_async(sk, SOCK_WAKE_WAITD, POLL_IN); 1886 rcu_read_unlock(); 1887} 1888 1889static void sock_def_write_space(struct sock *sk) 1890{ 1891 struct socket_wq *wq; 1892 1893 rcu_read_lock(); 1894 1895 /* Do not wake up a writer until he can make "significant" 1896 * progress. --DaveM 1897 */ 1898 if ((atomic_read(&sk->sk_wmem_alloc) << 1) <= sk->sk_sndbuf) { 1899 wq = rcu_dereference(sk->sk_wq); 1900 if (wq_has_sleeper(wq)) 1901 wake_up_interruptible_sync_poll(&wq->wait, POLLOUT | 1902 POLLWRNORM | POLLWRBAND); 1903 1904 /* Should agree with poll, otherwise some programs break */ 1905 if (sock_writeable(sk)) 1906 sk_wake_async(sk, SOCK_WAKE_SPACE, POLL_OUT); 1907 } 1908 1909 rcu_read_unlock(); 1910} 1911 1912static void sock_def_destruct(struct sock *sk) 1913{ 1914 kfree(sk->sk_protinfo); 1915} 1916 1917void sk_send_sigurg(struct sock *sk) 1918{ 1919 if (sk->sk_socket && sk->sk_socket->file) 1920 if (send_sigurg(&sk->sk_socket->file->f_owner)) 1921 sk_wake_async(sk, SOCK_WAKE_URG, POLL_PRI); 1922} 1923EXPORT_SYMBOL(sk_send_sigurg); 1924 1925void sk_reset_timer(struct sock *sk, struct timer_list* timer, 1926 unsigned long expires) 1927{ 1928 if (!mod_timer(timer, expires)) 1929 sock_hold(sk); 1930} 1931EXPORT_SYMBOL(sk_reset_timer); 1932 1933void sk_stop_timer(struct sock *sk, struct timer_list* timer) 1934{ 1935 if (timer_pending(timer) && del_timer(timer)) 1936 __sock_put(sk); 1937} 1938EXPORT_SYMBOL(sk_stop_timer); 1939 1940void sock_init_data(struct socket *sock, struct sock *sk) 1941{ 1942 skb_queue_head_init(&sk->sk_receive_queue); 1943 skb_queue_head_init(&sk->sk_write_queue); 1944 skb_queue_head_init(&sk->sk_error_queue); 1945#ifdef CONFIG_NET_DMA 1946 skb_queue_head_init(&sk->sk_async_wait_queue); 1947#endif 1948 1949 sk->sk_send_head = NULL; 1950 1951 init_timer(&sk->sk_timer); 1952 1953 sk->sk_allocation = GFP_KERNEL; 1954 sk->sk_rcvbuf = sysctl_rmem_default; 1955 sk->sk_sndbuf = sysctl_wmem_default; 1956 sk->sk_state = TCP_CLOSE; 1957 sk_set_socket(sk, sock); 1958 1959 sock_set_flag(sk, SOCK_ZAPPED); 1960 1961 if (sock) { 1962 sk->sk_type = sock->type; 1963 sk->sk_wq = sock->wq; 1964 sock->sk = sk; 1965 } else 1966 sk->sk_wq = NULL; 1967 1968 spin_lock_init(&sk->sk_dst_lock); 1969 rwlock_init(&sk->sk_callback_lock); 1970 lockdep_set_class_and_name(&sk->sk_callback_lock, 1971 af_callback_keys + sk->sk_family, 1972 af_family_clock_key_strings[sk->sk_family]); 1973 1974 sk->sk_state_change = sock_def_wakeup; 1975 sk->sk_data_ready = sock_def_readable; 1976 sk->sk_write_space = sock_def_write_space; 1977 sk->sk_error_report = sock_def_error_report; 1978 sk->sk_destruct = sock_def_destruct; 1979 1980 sk->sk_sndmsg_page = NULL; 1981 sk->sk_sndmsg_off = 0; 1982 1983 sk->sk_peer_pid = NULL; 1984 sk->sk_peer_cred = NULL; 1985 sk->sk_write_pending = 0; 1986 sk->sk_rcvlowat = 1; 1987 sk->sk_rcvtimeo = MAX_SCHEDULE_TIMEOUT; 1988 sk->sk_sndtimeo = MAX_SCHEDULE_TIMEOUT; 1989 1990 sk->sk_stamp = ktime_set(-1L, 0); 1991 1992 /* 1993 * Before updating sk_refcnt, we must commit prior changes to memory 1994 * (Documentation/RCU/rculist_nulls.txt for details) 1995 */ 1996 smp_wmb(); 1997 atomic_set(&sk->sk_refcnt, 1); 1998 atomic_set(&sk->sk_drops, 0); 1999} 2000EXPORT_SYMBOL(sock_init_data); 2001 2002void lock_sock_nested(struct sock *sk, int subclass) 2003{ 2004 might_sleep(); 2005 spin_lock_bh(&sk->sk_lock.slock); 2006 if (sk->sk_lock.owned) 2007 __lock_sock(sk); 2008 sk->sk_lock.owned = 1; 2009 spin_unlock(&sk->sk_lock.slock); 2010 /* 2011 * The sk_lock has mutex_lock() semantics here: 2012 */ 2013 mutex_acquire(&sk->sk_lock.dep_map, subclass, 0, _RET_IP_); 2014 local_bh_enable(); 2015} 2016EXPORT_SYMBOL(lock_sock_nested); 2017 2018void release_sock(struct sock *sk) 2019{ 2020 /* 2021 * The sk_lock has mutex_unlock() semantics: 2022 */ 2023 mutex_release(&sk->sk_lock.dep_map, 1, _RET_IP_); 2024 2025 spin_lock_bh(&sk->sk_lock.slock); 2026 if (sk->sk_backlog.tail) 2027 __release_sock(sk); 2028 sk->sk_lock.owned = 0; 2029 if (waitqueue_active(&sk->sk_lock.wq)) 2030 wake_up(&sk->sk_lock.wq); 2031 spin_unlock_bh(&sk->sk_lock.slock); 2032} 2033EXPORT_SYMBOL(release_sock); 2034 2035/** 2036 * lock_sock_fast - fast version of lock_sock 2037 * @sk: socket 2038 * 2039 * This version should be used for very small section, where process wont block 2040 * return false if fast path is taken 2041 * sk_lock.slock locked, owned = 0, BH disabled 2042 * return true if slow path is taken 2043 * sk_lock.slock unlocked, owned = 1, BH enabled 2044 */ 2045bool lock_sock_fast(struct sock *sk) 2046{ 2047 might_sleep(); 2048 spin_lock_bh(&sk->sk_lock.slock); 2049 2050 if (!sk->sk_lock.owned) 2051 /* 2052 * Note : We must disable BH 2053 */ 2054 return false; 2055 2056 __lock_sock(sk); 2057 sk->sk_lock.owned = 1; 2058 spin_unlock(&sk->sk_lock.slock); 2059 /* 2060 * The sk_lock has mutex_lock() semantics here: 2061 */ 2062 mutex_acquire(&sk->sk_lock.dep_map, 0, 0, _RET_IP_); 2063 local_bh_enable(); 2064 return true; 2065} 2066EXPORT_SYMBOL(lock_sock_fast); 2067 2068int sock_get_timestamp(struct sock *sk, struct timeval __user *userstamp) 2069{ 2070 struct timeval tv; 2071 if (!sock_flag(sk, SOCK_TIMESTAMP)) 2072 sock_enable_timestamp(sk, SOCK_TIMESTAMP); 2073 tv = ktime_to_timeval(sk->sk_stamp); 2074 if (tv.tv_sec == -1) 2075 return -ENOENT; 2076 if (tv.tv_sec == 0) { 2077 sk->sk_stamp = ktime_get_real(); 2078 tv = ktime_to_timeval(sk->sk_stamp); 2079 } 2080 return copy_to_user(userstamp, &tv, sizeof(tv)) ? -EFAULT : 0; 2081} 2082EXPORT_SYMBOL(sock_get_timestamp); 2083 2084int sock_get_timestampns(struct sock *sk, struct timespec __user *userstamp) 2085{ 2086 struct timespec ts; 2087 if (!sock_flag(sk, SOCK_TIMESTAMP)) 2088 sock_enable_timestamp(sk, SOCK_TIMESTAMP); 2089 ts = ktime_to_timespec(sk->sk_stamp); 2090 if (ts.tv_sec == -1) 2091 return -ENOENT; 2092 if (ts.tv_sec == 0) { 2093 sk->sk_stamp = ktime_get_real(); 2094 ts = ktime_to_timespec(sk->sk_stamp); 2095 } 2096 return copy_to_user(userstamp, &ts, sizeof(ts)) ? -EFAULT : 0; 2097} 2098EXPORT_SYMBOL(sock_get_timestampns); 2099 2100void sock_enable_timestamp(struct sock *sk, int flag) 2101{ 2102 if (!sock_flag(sk, flag)) { 2103 sock_set_flag(sk, flag); 2104 /* 2105 * we just set one of the two flags which require net 2106 * time stamping, but time stamping might have been on 2107 * already because of the other one 2108 */ 2109 if (!sock_flag(sk, 2110 flag == SOCK_TIMESTAMP ? 2111 SOCK_TIMESTAMPING_RX_SOFTWARE : 2112 SOCK_TIMESTAMP)) 2113 net_enable_timestamp(); 2114 } 2115} 2116 2117/* 2118 * Get a socket option on an socket. 2119 * 2120 * FIX: POSIX 1003.1g is very ambiguous here. It states that 2121 * asynchronous errors should be reported by getsockopt. We assume 2122 * this means if you specify SO_ERROR (otherwise whats the point of it). 2123 */ 2124int sock_common_getsockopt(struct socket *sock, int level, int optname, 2125 char __user *optval, int __user *optlen) 2126{ 2127 struct sock *sk = sock->sk; 2128 2129 return sk->sk_prot->getsockopt(sk, level, optname, optval, optlen); 2130} 2131EXPORT_SYMBOL(sock_common_getsockopt); 2132 2133#ifdef CONFIG_COMPAT 2134int compat_sock_common_getsockopt(struct socket *sock, int level, int optname, 2135 char __user *optval, int __user *optlen) 2136{ 2137 struct sock *sk = sock->sk; 2138 2139 if (sk->sk_prot->compat_getsockopt != NULL) 2140 return sk->sk_prot->compat_getsockopt(sk, level, optname, 2141 optval, optlen); 2142 return sk->sk_prot->getsockopt(sk, level, optname, optval, optlen); 2143} 2144EXPORT_SYMBOL(compat_sock_common_getsockopt); 2145#endif 2146 2147int sock_common_recvmsg(struct kiocb *iocb, struct socket *sock, 2148 struct msghdr *msg, size_t size, int flags) 2149{ 2150 struct sock *sk = sock->sk; 2151 int addr_len = 0; 2152 int err; 2153 2154 err = sk->sk_prot->recvmsg(iocb, sk, msg, size, flags & MSG_DONTWAIT, 2155 flags & ~MSG_DONTWAIT, &addr_len); 2156 if (err >= 0) 2157 msg->msg_namelen = addr_len; 2158 return err; 2159} 2160EXPORT_SYMBOL(sock_common_recvmsg); 2161 2162/* 2163 * Set socket options on an inet socket. 2164 */ 2165int sock_common_setsockopt(struct socket *sock, int level, int optname, 2166 char __user *optval, unsigned int optlen) 2167{ 2168 struct sock *sk = sock->sk; 2169 2170 return sk->sk_prot->setsockopt(sk, level, optname, optval, optlen); 2171} 2172EXPORT_SYMBOL(sock_common_setsockopt); 2173 2174#ifdef CONFIG_COMPAT 2175int compat_sock_common_setsockopt(struct socket *sock, int level, int optname, 2176 char __user *optval, unsigned int optlen) 2177{ 2178 struct sock *sk = sock->sk; 2179 2180 if (sk->sk_prot->compat_setsockopt != NULL) 2181 return sk->sk_prot->compat_setsockopt(sk, level, optname, 2182 optval, optlen); 2183 return sk->sk_prot->setsockopt(sk, level, optname, optval, optlen); 2184} 2185EXPORT_SYMBOL(compat_sock_common_setsockopt); 2186#endif 2187 2188void sk_common_release(struct sock *sk) 2189{ 2190 if (sk->sk_prot->destroy) 2191 sk->sk_prot->destroy(sk); 2192 2193 /* 2194 * Observation: when sock_common_release is called, processes have 2195 * no access to socket. But net still has. 2196 * Step one, detach it from networking: 2197 * 2198 * A. Remove from hash tables. 2199 */ 2200 2201 sk->sk_prot->unhash(sk); 2202 2203 /* 2204 * In this point socket cannot receive new packets, but it is possible 2205 * that some packets are in flight because some CPU runs receiver and 2206 * did hash table lookup before we unhashed socket. They will achieve 2207 * receive queue and will be purged by socket destructor. 2208 * 2209 * Also we still have packets pending on receive queue and probably, 2210 * our own packets waiting in device queues. sock_destroy will drain 2211 * receive queue, but transmitted packets will delay socket destruction 2212 * until the last reference will be released. 2213 */ 2214 2215 sock_orphan(sk); 2216 2217 xfrm_sk_free_policy(sk); 2218 2219 sk_refcnt_debug_release(sk); 2220 sock_put(sk); 2221} 2222EXPORT_SYMBOL(sk_common_release); 2223 2224static DEFINE_RWLOCK(proto_list_lock); 2225static LIST_HEAD(proto_list); 2226 2227#ifdef CONFIG_PROC_FS 2228#define PROTO_INUSE_NR 64 /* should be enough for the first time */ 2229struct prot_inuse { 2230 int val[PROTO_INUSE_NR]; 2231}; 2232 2233static DECLARE_BITMAP(proto_inuse_idx, PROTO_INUSE_NR); 2234 2235#ifdef CONFIG_NET_NS 2236void sock_prot_inuse_add(struct net *net, struct proto *prot, int val) 2237{ 2238 __this_cpu_add(net->core.inuse->val[prot->inuse_idx], val); 2239} 2240EXPORT_SYMBOL_GPL(sock_prot_inuse_add); 2241 2242int sock_prot_inuse_get(struct net *net, struct proto *prot) 2243{ 2244 int cpu, idx = prot->inuse_idx; 2245 int res = 0; 2246 2247 for_each_possible_cpu(cpu) 2248 res += per_cpu_ptr(net->core.inuse, cpu)->val[idx]; 2249 2250 return res >= 0 ? res : 0; 2251} 2252EXPORT_SYMBOL_GPL(sock_prot_inuse_get); 2253 2254static int __net_init sock_inuse_init_net(struct net *net) 2255{ 2256 net->core.inuse = alloc_percpu(struct prot_inuse); 2257 return net->core.inuse ? 0 : -ENOMEM; 2258} 2259 2260static void __net_exit sock_inuse_exit_net(struct net *net) 2261{ 2262 free_percpu(net->core.inuse); 2263} 2264 2265static struct pernet_operations net_inuse_ops = { 2266 .init = sock_inuse_init_net, 2267 .exit = sock_inuse_exit_net, 2268}; 2269 2270static __init int net_inuse_init(void) 2271{ 2272 if (register_pernet_subsys(&net_inuse_ops)) 2273 panic("Cannot initialize net inuse counters"); 2274 2275 return 0; 2276} 2277 2278core_initcall(net_inuse_init); 2279#else 2280static DEFINE_PER_CPU(struct prot_inuse, prot_inuse); 2281 2282void sock_prot_inuse_add(struct net *net, struct proto *prot, int val) 2283{ 2284 __this_cpu_add(prot_inuse.val[prot->inuse_idx], val); 2285} 2286EXPORT_SYMBOL_GPL(sock_prot_inuse_add); 2287 2288int sock_prot_inuse_get(struct net *net, struct proto *prot) 2289{ 2290 int cpu, idx = prot->inuse_idx; 2291 int res = 0; 2292 2293 for_each_possible_cpu(cpu) 2294 res += per_cpu(prot_inuse, cpu).val[idx]; 2295 2296 return res >= 0 ? res : 0; 2297} 2298EXPORT_SYMBOL_GPL(sock_prot_inuse_get); 2299#endif 2300 2301static void assign_proto_idx(struct proto *prot) 2302{ 2303 prot->inuse_idx = find_first_zero_bit(proto_inuse_idx, PROTO_INUSE_NR); 2304 2305 if (unlikely(prot->inuse_idx == PROTO_INUSE_NR - 1)) { 2306 printk(KERN_ERR "PROTO_INUSE_NR exhausted\n"); 2307 return; 2308 } 2309 2310 set_bit(prot->inuse_idx, proto_inuse_idx); 2311} 2312 2313static void release_proto_idx(struct proto *prot) 2314{ 2315 if (prot->inuse_idx != PROTO_INUSE_NR - 1) 2316 clear_bit(prot->inuse_idx, proto_inuse_idx); 2317} 2318#else 2319static inline void assign_proto_idx(struct proto *prot) 2320{ 2321} 2322 2323static inline void release_proto_idx(struct proto *prot) 2324{ 2325} 2326#endif 2327 2328int proto_register(struct proto *prot, int alloc_slab) 2329{ 2330 if (alloc_slab) { 2331 prot->slab = kmem_cache_create(prot->name, prot->obj_size, 0, 2332 SLAB_HWCACHE_ALIGN | prot->slab_flags, 2333 NULL); 2334 2335 if (prot->slab == NULL) { 2336 printk(KERN_CRIT "%s: Can't create sock SLAB cache!\n", 2337 prot->name); 2338 goto out; 2339 } 2340 2341 if (prot->rsk_prot != NULL) { 2342 prot->rsk_prot->slab_name = kasprintf(GFP_KERNEL, "request_sock_%s", prot->name); 2343 if (prot->rsk_prot->slab_name == NULL) 2344 goto out_free_sock_slab; 2345 2346 prot->rsk_prot->slab = kmem_cache_create(prot->rsk_prot->slab_name, 2347 prot->rsk_prot->obj_size, 0, 2348 SLAB_HWCACHE_ALIGN, NULL); 2349 2350 if (prot->rsk_prot->slab == NULL) { 2351 printk(KERN_CRIT "%s: Can't create request sock SLAB cache!\n", 2352 prot->name); 2353 goto out_free_request_sock_slab_name; 2354 } 2355 } 2356 2357 if (prot->twsk_prot != NULL) { 2358 prot->twsk_prot->twsk_slab_name = kasprintf(GFP_KERNEL, "tw_sock_%s", prot->name); 2359 2360 if (prot->twsk_prot->twsk_slab_name == NULL) 2361 goto out_free_request_sock_slab; 2362 2363 prot->twsk_prot->twsk_slab = 2364 kmem_cache_create(prot->twsk_prot->twsk_slab_name, 2365 prot->twsk_prot->twsk_obj_size, 2366 0, 2367 SLAB_HWCACHE_ALIGN | 2368 prot->slab_flags, 2369 NULL); 2370 if (prot->twsk_prot->twsk_slab == NULL) 2371 goto out_free_timewait_sock_slab_name; 2372 } 2373 } 2374 2375 write_lock(&proto_list_lock); 2376 list_add(&prot->node, &proto_list); 2377 assign_proto_idx(prot); 2378 write_unlock(&proto_list_lock); 2379 return 0; 2380 2381out_free_timewait_sock_slab_name: 2382 kfree(prot->twsk_prot->twsk_slab_name); 2383out_free_request_sock_slab: 2384 if (prot->rsk_prot && prot->rsk_prot->slab) { 2385 kmem_cache_destroy(prot->rsk_prot->slab); 2386 prot->rsk_prot->slab = NULL; 2387 } 2388out_free_request_sock_slab_name: 2389 if (prot->rsk_prot) 2390 kfree(prot->rsk_prot->slab_name); 2391out_free_sock_slab: 2392 kmem_cache_destroy(prot->slab); 2393 prot->slab = NULL; 2394out: 2395 return -ENOBUFS; 2396} 2397EXPORT_SYMBOL(proto_register); 2398 2399void proto_unregister(struct proto *prot) 2400{ 2401 write_lock(&proto_list_lock); 2402 release_proto_idx(prot); 2403 list_del(&prot->node); 2404 write_unlock(&proto_list_lock); 2405 2406 if (prot->slab != NULL) { 2407 kmem_cache_destroy(prot->slab); 2408 prot->slab = NULL; 2409 } 2410 2411 if (prot->rsk_prot != NULL && prot->rsk_prot->slab != NULL) { 2412 kmem_cache_destroy(prot->rsk_prot->slab); 2413 kfree(prot->rsk_prot->slab_name); 2414 prot->rsk_prot->slab = NULL; 2415 } 2416 2417 if (prot->twsk_prot != NULL && prot->twsk_prot->twsk_slab != NULL) { 2418 kmem_cache_destroy(prot->twsk_prot->twsk_slab); 2419 kfree(prot->twsk_prot->twsk_slab_name); 2420 prot->twsk_prot->twsk_slab = NULL; 2421 } 2422} 2423EXPORT_SYMBOL(proto_unregister); 2424 2425#ifdef CONFIG_PROC_FS 2426static void *proto_seq_start(struct seq_file *seq, loff_t *pos) 2427 __acquires(proto_list_lock) 2428{ 2429 read_lock(&proto_list_lock); 2430 return seq_list_start_head(&proto_list, *pos); 2431} 2432 2433static void *proto_seq_next(struct seq_file *seq, void *v, loff_t *pos) 2434{ 2435 return seq_list_next(v, &proto_list, pos); 2436} 2437 2438static void proto_seq_stop(struct seq_file *seq, void *v) 2439 __releases(proto_list_lock) 2440{ 2441 read_unlock(&proto_list_lock); 2442} 2443 2444static char proto_method_implemented(const void *method) 2445{ 2446 return method == NULL ? 'n' : 'y'; 2447} 2448 2449static void proto_seq_printf(struct seq_file *seq, struct proto *proto) 2450{ 2451 seq_printf(seq, "%-9s %4u %6d %6d %-3s %6u %-3s %-10s " 2452 "%2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c\n", 2453 proto->name, 2454 proto->obj_size, 2455 sock_prot_inuse_get(seq_file_net(seq), proto), 2456 proto->memory_allocated != NULL ? atomic_read(proto->memory_allocated) : -1, 2457 proto->memory_pressure != NULL ? *proto->memory_pressure ? "yes" : "no" : "NI", 2458 proto->max_header, 2459 proto->slab == NULL ? "no" : "yes", 2460 module_name(proto->owner), 2461 proto_method_implemented(proto->close), 2462 proto_method_implemented(proto->connect), 2463 proto_method_implemented(proto->disconnect), 2464 proto_method_implemented(proto->accept), 2465 proto_method_implemented(proto->ioctl), 2466 proto_method_implemented(proto->init), 2467 proto_method_implemented(proto->destroy), 2468 proto_method_implemented(proto->shutdown), 2469 proto_method_implemented(proto->setsockopt), 2470 proto_method_implemented(proto->getsockopt), 2471 proto_method_implemented(proto->sendmsg), 2472 proto_method_implemented(proto->recvmsg), 2473 proto_method_implemented(proto->sendpage), 2474 proto_method_implemented(proto->bind), 2475 proto_method_implemented(proto->backlog_rcv), 2476 proto_method_implemented(proto->hash), 2477 proto_method_implemented(proto->unhash), 2478 proto_method_implemented(proto->get_port), 2479 proto_method_implemented(proto->enter_memory_pressure)); 2480} 2481 2482static int proto_seq_show(struct seq_file *seq, void *v) 2483{ 2484 if (v == &proto_list) 2485 seq_printf(seq, "%-9s %-4s %-8s %-6s %-5s %-7s %-4s %-10s %s", 2486 "protocol", 2487 "size", 2488 "sockets", 2489 "memory", 2490 "press", 2491 "maxhdr", 2492 "slab", 2493 "module", 2494 "cl co di ac io in de sh ss gs se re sp bi br ha uh gp em\n"); 2495 else 2496 proto_seq_printf(seq, list_entry(v, struct proto, node)); 2497 return 0; 2498} 2499 2500static const struct seq_operations proto_seq_ops = { 2501 .start = proto_seq_start, 2502 .next = proto_seq_next, 2503 .stop = proto_seq_stop, 2504 .show = proto_seq_show, 2505}; 2506 2507static int proto_seq_open(struct inode *inode, struct file *file) 2508{ 2509 return seq_open_net(inode, file, &proto_seq_ops, 2510 sizeof(struct seq_net_private)); 2511} 2512 2513static const struct file_operations proto_seq_fops = { 2514 .owner = THIS_MODULE, 2515 .open = proto_seq_open, 2516 .read = seq_read, 2517 .llseek = seq_lseek, 2518 .release = seq_release_net, 2519}; 2520 2521static __net_init int proto_init_net(struct net *net) 2522{ 2523 if (!proc_net_fops_create(net, "protocols", S_IRUGO, &proto_seq_fops)) 2524 return -ENOMEM; 2525 2526 return 0; 2527} 2528 2529static __net_exit void proto_exit_net(struct net *net) 2530{ 2531 proc_net_remove(net, "protocols"); 2532} 2533 2534 2535static __net_initdata struct pernet_operations proto_net_ops = { 2536 .init = proto_init_net, 2537 .exit = proto_exit_net, 2538}; 2539 2540static int __init proto_init(void) 2541{ 2542 return register_pernet_subsys(&proto_net_ops); 2543} 2544 2545subsys_initcall(proto_init); 2546 2547#endif /* PROC_FS */ 2548