sock.c revision 2d48d67fa8cd129ea85ea02d91b4a793286866f8
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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt 93 94#include <linux/capability.h> 95#include <linux/errno.h> 96#include <linux/types.h> 97#include <linux/socket.h> 98#include <linux/in.h> 99#include <linux/kernel.h> 100#include <linux/module.h> 101#include <linux/proc_fs.h> 102#include <linux/seq_file.h> 103#include <linux/sched.h> 104#include <linux/timer.h> 105#include <linux/string.h> 106#include <linux/sockios.h> 107#include <linux/net.h> 108#include <linux/mm.h> 109#include <linux/slab.h> 110#include <linux/interrupt.h> 111#include <linux/poll.h> 112#include <linux/tcp.h> 113#include <linux/init.h> 114#include <linux/highmem.h> 115#include <linux/user_namespace.h> 116#include <linux/static_key.h> 117#include <linux/memcontrol.h> 118#include <linux/prefetch.h> 119 120#include <asm/uaccess.h> 121 122#include <linux/netdevice.h> 123#include <net/protocol.h> 124#include <linux/skbuff.h> 125#include <net/net_namespace.h> 126#include <net/request_sock.h> 127#include <net/sock.h> 128#include <linux/net_tstamp.h> 129#include <net/xfrm.h> 130#include <linux/ipsec.h> 131#include <net/cls_cgroup.h> 132#include <net/netprio_cgroup.h> 133 134#include <linux/filter.h> 135 136#include <trace/events/sock.h> 137 138#ifdef CONFIG_INET 139#include <net/tcp.h> 140#endif 141 142#include <net/ll_poll.h> 143 144static DEFINE_MUTEX(proto_list_mutex); 145static LIST_HEAD(proto_list); 146 147#ifdef CONFIG_MEMCG_KMEM 148int mem_cgroup_sockets_init(struct mem_cgroup *memcg, struct cgroup_subsys *ss) 149{ 150 struct proto *proto; 151 int ret = 0; 152 153 mutex_lock(&proto_list_mutex); 154 list_for_each_entry(proto, &proto_list, node) { 155 if (proto->init_cgroup) { 156 ret = proto->init_cgroup(memcg, ss); 157 if (ret) 158 goto out; 159 } 160 } 161 162 mutex_unlock(&proto_list_mutex); 163 return ret; 164out: 165 list_for_each_entry_continue_reverse(proto, &proto_list, node) 166 if (proto->destroy_cgroup) 167 proto->destroy_cgroup(memcg); 168 mutex_unlock(&proto_list_mutex); 169 return ret; 170} 171 172void mem_cgroup_sockets_destroy(struct mem_cgroup *memcg) 173{ 174 struct proto *proto; 175 176 mutex_lock(&proto_list_mutex); 177 list_for_each_entry_reverse(proto, &proto_list, node) 178 if (proto->destroy_cgroup) 179 proto->destroy_cgroup(memcg); 180 mutex_unlock(&proto_list_mutex); 181} 182#endif 183 184/* 185 * Each address family might have different locking rules, so we have 186 * one slock key per address family: 187 */ 188static struct lock_class_key af_family_keys[AF_MAX]; 189static struct lock_class_key af_family_slock_keys[AF_MAX]; 190 191#if defined(CONFIG_MEMCG_KMEM) 192struct static_key memcg_socket_limit_enabled; 193EXPORT_SYMBOL(memcg_socket_limit_enabled); 194#endif 195 196/* 197 * Make lock validator output more readable. (we pre-construct these 198 * strings build-time, so that runtime initialization of socket 199 * locks is fast): 200 */ 201static const char *const af_family_key_strings[AF_MAX+1] = { 202 "sk_lock-AF_UNSPEC", "sk_lock-AF_UNIX" , "sk_lock-AF_INET" , 203 "sk_lock-AF_AX25" , "sk_lock-AF_IPX" , "sk_lock-AF_APPLETALK", 204 "sk_lock-AF_NETROM", "sk_lock-AF_BRIDGE" , "sk_lock-AF_ATMPVC" , 205 "sk_lock-AF_X25" , "sk_lock-AF_INET6" , "sk_lock-AF_ROSE" , 206 "sk_lock-AF_DECnet", "sk_lock-AF_NETBEUI" , "sk_lock-AF_SECURITY" , 207 "sk_lock-AF_KEY" , "sk_lock-AF_NETLINK" , "sk_lock-AF_PACKET" , 208 "sk_lock-AF_ASH" , "sk_lock-AF_ECONET" , "sk_lock-AF_ATMSVC" , 209 "sk_lock-AF_RDS" , "sk_lock-AF_SNA" , "sk_lock-AF_IRDA" , 210 "sk_lock-AF_PPPOX" , "sk_lock-AF_WANPIPE" , "sk_lock-AF_LLC" , 211 "sk_lock-27" , "sk_lock-28" , "sk_lock-AF_CAN" , 212 "sk_lock-AF_TIPC" , "sk_lock-AF_BLUETOOTH", "sk_lock-IUCV" , 213 "sk_lock-AF_RXRPC" , "sk_lock-AF_ISDN" , "sk_lock-AF_PHONET" , 214 "sk_lock-AF_IEEE802154", "sk_lock-AF_CAIF" , "sk_lock-AF_ALG" , 215 "sk_lock-AF_NFC" , "sk_lock-AF_VSOCK" , "sk_lock-AF_MAX" 216}; 217static const char *const af_family_slock_key_strings[AF_MAX+1] = { 218 "slock-AF_UNSPEC", "slock-AF_UNIX" , "slock-AF_INET" , 219 "slock-AF_AX25" , "slock-AF_IPX" , "slock-AF_APPLETALK", 220 "slock-AF_NETROM", "slock-AF_BRIDGE" , "slock-AF_ATMPVC" , 221 "slock-AF_X25" , "slock-AF_INET6" , "slock-AF_ROSE" , 222 "slock-AF_DECnet", "slock-AF_NETBEUI" , "slock-AF_SECURITY" , 223 "slock-AF_KEY" , "slock-AF_NETLINK" , "slock-AF_PACKET" , 224 "slock-AF_ASH" , "slock-AF_ECONET" , "slock-AF_ATMSVC" , 225 "slock-AF_RDS" , "slock-AF_SNA" , "slock-AF_IRDA" , 226 "slock-AF_PPPOX" , "slock-AF_WANPIPE" , "slock-AF_LLC" , 227 "slock-27" , "slock-28" , "slock-AF_CAN" , 228 "slock-AF_TIPC" , "slock-AF_BLUETOOTH", "slock-AF_IUCV" , 229 "slock-AF_RXRPC" , "slock-AF_ISDN" , "slock-AF_PHONET" , 230 "slock-AF_IEEE802154", "slock-AF_CAIF" , "slock-AF_ALG" , 231 "slock-AF_NFC" , "slock-AF_VSOCK" ,"slock-AF_MAX" 232}; 233static const char *const af_family_clock_key_strings[AF_MAX+1] = { 234 "clock-AF_UNSPEC", "clock-AF_UNIX" , "clock-AF_INET" , 235 "clock-AF_AX25" , "clock-AF_IPX" , "clock-AF_APPLETALK", 236 "clock-AF_NETROM", "clock-AF_BRIDGE" , "clock-AF_ATMPVC" , 237 "clock-AF_X25" , "clock-AF_INET6" , "clock-AF_ROSE" , 238 "clock-AF_DECnet", "clock-AF_NETBEUI" , "clock-AF_SECURITY" , 239 "clock-AF_KEY" , "clock-AF_NETLINK" , "clock-AF_PACKET" , 240 "clock-AF_ASH" , "clock-AF_ECONET" , "clock-AF_ATMSVC" , 241 "clock-AF_RDS" , "clock-AF_SNA" , "clock-AF_IRDA" , 242 "clock-AF_PPPOX" , "clock-AF_WANPIPE" , "clock-AF_LLC" , 243 "clock-27" , "clock-28" , "clock-AF_CAN" , 244 "clock-AF_TIPC" , "clock-AF_BLUETOOTH", "clock-AF_IUCV" , 245 "clock-AF_RXRPC" , "clock-AF_ISDN" , "clock-AF_PHONET" , 246 "clock-AF_IEEE802154", "clock-AF_CAIF" , "clock-AF_ALG" , 247 "clock-AF_NFC" , "clock-AF_VSOCK" , "clock-AF_MAX" 248}; 249 250/* 251 * sk_callback_lock locking rules are per-address-family, 252 * so split the lock classes by using a per-AF key: 253 */ 254static struct lock_class_key af_callback_keys[AF_MAX]; 255 256/* Take into consideration the size of the struct sk_buff overhead in the 257 * determination of these values, since that is non-constant across 258 * platforms. This makes socket queueing behavior and performance 259 * not depend upon such differences. 260 */ 261#define _SK_MEM_PACKETS 256 262#define _SK_MEM_OVERHEAD SKB_TRUESIZE(256) 263#define SK_WMEM_MAX (_SK_MEM_OVERHEAD * _SK_MEM_PACKETS) 264#define SK_RMEM_MAX (_SK_MEM_OVERHEAD * _SK_MEM_PACKETS) 265 266/* Run time adjustable parameters. */ 267__u32 sysctl_wmem_max __read_mostly = SK_WMEM_MAX; 268EXPORT_SYMBOL(sysctl_wmem_max); 269__u32 sysctl_rmem_max __read_mostly = SK_RMEM_MAX; 270EXPORT_SYMBOL(sysctl_rmem_max); 271__u32 sysctl_wmem_default __read_mostly = SK_WMEM_MAX; 272__u32 sysctl_rmem_default __read_mostly = SK_RMEM_MAX; 273 274/* Maximal space eaten by iovec or ancillary data plus some space */ 275int sysctl_optmem_max __read_mostly = sizeof(unsigned long)*(2*UIO_MAXIOV+512); 276EXPORT_SYMBOL(sysctl_optmem_max); 277 278struct static_key memalloc_socks = STATIC_KEY_INIT_FALSE; 279EXPORT_SYMBOL_GPL(memalloc_socks); 280 281/** 282 * sk_set_memalloc - sets %SOCK_MEMALLOC 283 * @sk: socket to set it on 284 * 285 * Set %SOCK_MEMALLOC on a socket for access to emergency reserves. 286 * It's the responsibility of the admin to adjust min_free_kbytes 287 * to meet the requirements 288 */ 289void sk_set_memalloc(struct sock *sk) 290{ 291 sock_set_flag(sk, SOCK_MEMALLOC); 292 sk->sk_allocation |= __GFP_MEMALLOC; 293 static_key_slow_inc(&memalloc_socks); 294} 295EXPORT_SYMBOL_GPL(sk_set_memalloc); 296 297void sk_clear_memalloc(struct sock *sk) 298{ 299 sock_reset_flag(sk, SOCK_MEMALLOC); 300 sk->sk_allocation &= ~__GFP_MEMALLOC; 301 static_key_slow_dec(&memalloc_socks); 302 303 /* 304 * SOCK_MEMALLOC is allowed to ignore rmem limits to ensure forward 305 * progress of swapping. However, if SOCK_MEMALLOC is cleared while 306 * it has rmem allocations there is a risk that the user of the 307 * socket cannot make forward progress due to exceeding the rmem 308 * limits. By rights, sk_clear_memalloc() should only be called 309 * on sockets being torn down but warn and reset the accounting if 310 * that assumption breaks. 311 */ 312 if (WARN_ON(sk->sk_forward_alloc)) 313 sk_mem_reclaim(sk); 314} 315EXPORT_SYMBOL_GPL(sk_clear_memalloc); 316 317int __sk_backlog_rcv(struct sock *sk, struct sk_buff *skb) 318{ 319 int ret; 320 unsigned long pflags = current->flags; 321 322 /* these should have been dropped before queueing */ 323 BUG_ON(!sock_flag(sk, SOCK_MEMALLOC)); 324 325 current->flags |= PF_MEMALLOC; 326 ret = sk->sk_backlog_rcv(sk, skb); 327 tsk_restore_flags(current, pflags, PF_MEMALLOC); 328 329 return ret; 330} 331EXPORT_SYMBOL(__sk_backlog_rcv); 332 333static int sock_set_timeout(long *timeo_p, char __user *optval, int optlen) 334{ 335 struct timeval tv; 336 337 if (optlen < sizeof(tv)) 338 return -EINVAL; 339 if (copy_from_user(&tv, optval, sizeof(tv))) 340 return -EFAULT; 341 if (tv.tv_usec < 0 || tv.tv_usec >= USEC_PER_SEC) 342 return -EDOM; 343 344 if (tv.tv_sec < 0) { 345 static int warned __read_mostly; 346 347 *timeo_p = 0; 348 if (warned < 10 && net_ratelimit()) { 349 warned++; 350 pr_info("%s: `%s' (pid %d) tries to set negative timeout\n", 351 __func__, current->comm, task_pid_nr(current)); 352 } 353 return 0; 354 } 355 *timeo_p = MAX_SCHEDULE_TIMEOUT; 356 if (tv.tv_sec == 0 && tv.tv_usec == 0) 357 return 0; 358 if (tv.tv_sec < (MAX_SCHEDULE_TIMEOUT/HZ - 1)) 359 *timeo_p = tv.tv_sec*HZ + (tv.tv_usec+(1000000/HZ-1))/(1000000/HZ); 360 return 0; 361} 362 363static void sock_warn_obsolete_bsdism(const char *name) 364{ 365 static int warned; 366 static char warncomm[TASK_COMM_LEN]; 367 if (strcmp(warncomm, current->comm) && warned < 5) { 368 strcpy(warncomm, current->comm); 369 pr_warn("process `%s' is using obsolete %s SO_BSDCOMPAT\n", 370 warncomm, name); 371 warned++; 372 } 373} 374 375#define SK_FLAGS_TIMESTAMP ((1UL << SOCK_TIMESTAMP) | (1UL << SOCK_TIMESTAMPING_RX_SOFTWARE)) 376 377static void sock_disable_timestamp(struct sock *sk, unsigned long flags) 378{ 379 if (sk->sk_flags & flags) { 380 sk->sk_flags &= ~flags; 381 if (!(sk->sk_flags & SK_FLAGS_TIMESTAMP)) 382 net_disable_timestamp(); 383 } 384} 385 386 387int sock_queue_rcv_skb(struct sock *sk, struct sk_buff *skb) 388{ 389 int err; 390 int skb_len; 391 unsigned long flags; 392 struct sk_buff_head *list = &sk->sk_receive_queue; 393 394 if (atomic_read(&sk->sk_rmem_alloc) >= sk->sk_rcvbuf) { 395 atomic_inc(&sk->sk_drops); 396 trace_sock_rcvqueue_full(sk, skb); 397 return -ENOMEM; 398 } 399 400 err = sk_filter(sk, skb); 401 if (err) 402 return err; 403 404 if (!sk_rmem_schedule(sk, skb, skb->truesize)) { 405 atomic_inc(&sk->sk_drops); 406 return -ENOBUFS; 407 } 408 409 skb->dev = NULL; 410 skb_set_owner_r(skb, sk); 411 412 /* Cache the SKB length before we tack it onto the receive 413 * queue. Once it is added it no longer belongs to us and 414 * may be freed by other threads of control pulling packets 415 * from the queue. 416 */ 417 skb_len = skb->len; 418 419 /* we escape from rcu protected region, make sure we dont leak 420 * a norefcounted dst 421 */ 422 skb_dst_force(skb); 423 424 spin_lock_irqsave(&list->lock, flags); 425 skb->dropcount = atomic_read(&sk->sk_drops); 426 __skb_queue_tail(list, skb); 427 spin_unlock_irqrestore(&list->lock, flags); 428 429 if (!sock_flag(sk, SOCK_DEAD)) 430 sk->sk_data_ready(sk, skb_len); 431 return 0; 432} 433EXPORT_SYMBOL(sock_queue_rcv_skb); 434 435int sk_receive_skb(struct sock *sk, struct sk_buff *skb, const int nested) 436{ 437 int rc = NET_RX_SUCCESS; 438 439 if (sk_filter(sk, skb)) 440 goto discard_and_relse; 441 442 skb->dev = NULL; 443 444 if (sk_rcvqueues_full(sk, skb, sk->sk_rcvbuf)) { 445 atomic_inc(&sk->sk_drops); 446 goto discard_and_relse; 447 } 448 if (nested) 449 bh_lock_sock_nested(sk); 450 else 451 bh_lock_sock(sk); 452 if (!sock_owned_by_user(sk)) { 453 /* 454 * trylock + unlock semantics: 455 */ 456 mutex_acquire(&sk->sk_lock.dep_map, 0, 1, _RET_IP_); 457 458 rc = sk_backlog_rcv(sk, skb); 459 460 mutex_release(&sk->sk_lock.dep_map, 1, _RET_IP_); 461 } else if (sk_add_backlog(sk, skb, sk->sk_rcvbuf)) { 462 bh_unlock_sock(sk); 463 atomic_inc(&sk->sk_drops); 464 goto discard_and_relse; 465 } 466 467 bh_unlock_sock(sk); 468out: 469 sock_put(sk); 470 return rc; 471discard_and_relse: 472 kfree_skb(skb); 473 goto out; 474} 475EXPORT_SYMBOL(sk_receive_skb); 476 477void sk_reset_txq(struct sock *sk) 478{ 479 sk_tx_queue_clear(sk); 480} 481EXPORT_SYMBOL(sk_reset_txq); 482 483struct dst_entry *__sk_dst_check(struct sock *sk, u32 cookie) 484{ 485 struct dst_entry *dst = __sk_dst_get(sk); 486 487 if (dst && dst->obsolete && dst->ops->check(dst, cookie) == NULL) { 488 sk_tx_queue_clear(sk); 489 RCU_INIT_POINTER(sk->sk_dst_cache, NULL); 490 dst_release(dst); 491 return NULL; 492 } 493 494 return dst; 495} 496EXPORT_SYMBOL(__sk_dst_check); 497 498struct dst_entry *sk_dst_check(struct sock *sk, u32 cookie) 499{ 500 struct dst_entry *dst = sk_dst_get(sk); 501 502 if (dst && dst->obsolete && dst->ops->check(dst, cookie) == NULL) { 503 sk_dst_reset(sk); 504 dst_release(dst); 505 return NULL; 506 } 507 508 return dst; 509} 510EXPORT_SYMBOL(sk_dst_check); 511 512static int sock_setbindtodevice(struct sock *sk, char __user *optval, 513 int optlen) 514{ 515 int ret = -ENOPROTOOPT; 516#ifdef CONFIG_NETDEVICES 517 struct net *net = sock_net(sk); 518 char devname[IFNAMSIZ]; 519 int index; 520 521 /* Sorry... */ 522 ret = -EPERM; 523 if (!ns_capable(net->user_ns, CAP_NET_RAW)) 524 goto out; 525 526 ret = -EINVAL; 527 if (optlen < 0) 528 goto out; 529 530 /* Bind this socket to a particular device like "eth0", 531 * as specified in the passed interface name. If the 532 * name is "" or the option length is zero the socket 533 * is not bound. 534 */ 535 if (optlen > IFNAMSIZ - 1) 536 optlen = IFNAMSIZ - 1; 537 memset(devname, 0, sizeof(devname)); 538 539 ret = -EFAULT; 540 if (copy_from_user(devname, optval, optlen)) 541 goto out; 542 543 index = 0; 544 if (devname[0] != '\0') { 545 struct net_device *dev; 546 547 rcu_read_lock(); 548 dev = dev_get_by_name_rcu(net, devname); 549 if (dev) 550 index = dev->ifindex; 551 rcu_read_unlock(); 552 ret = -ENODEV; 553 if (!dev) 554 goto out; 555 } 556 557 lock_sock(sk); 558 sk->sk_bound_dev_if = index; 559 sk_dst_reset(sk); 560 release_sock(sk); 561 562 ret = 0; 563 564out: 565#endif 566 567 return ret; 568} 569 570static int sock_getbindtodevice(struct sock *sk, char __user *optval, 571 int __user *optlen, int len) 572{ 573 int ret = -ENOPROTOOPT; 574#ifdef CONFIG_NETDEVICES 575 struct net *net = sock_net(sk); 576 struct net_device *dev; 577 char devname[IFNAMSIZ]; 578 unsigned seq; 579 580 if (sk->sk_bound_dev_if == 0) { 581 len = 0; 582 goto zero; 583 } 584 585 ret = -EINVAL; 586 if (len < IFNAMSIZ) 587 goto out; 588 589retry: 590 seq = read_seqcount_begin(&devnet_rename_seq); 591 rcu_read_lock(); 592 dev = dev_get_by_index_rcu(net, sk->sk_bound_dev_if); 593 ret = -ENODEV; 594 if (!dev) { 595 rcu_read_unlock(); 596 goto out; 597 } 598 599 strcpy(devname, dev->name); 600 rcu_read_unlock(); 601 if (read_seqcount_retry(&devnet_rename_seq, seq)) 602 goto retry; 603 604 len = strlen(devname) + 1; 605 606 ret = -EFAULT; 607 if (copy_to_user(optval, devname, len)) 608 goto out; 609 610zero: 611 ret = -EFAULT; 612 if (put_user(len, optlen)) 613 goto out; 614 615 ret = 0; 616 617out: 618#endif 619 620 return ret; 621} 622 623static inline void sock_valbool_flag(struct sock *sk, int bit, int valbool) 624{ 625 if (valbool) 626 sock_set_flag(sk, bit); 627 else 628 sock_reset_flag(sk, bit); 629} 630 631/* 632 * This is meant for all protocols to use and covers goings on 633 * at the socket level. Everything here is generic. 634 */ 635 636int sock_setsockopt(struct socket *sock, int level, int optname, 637 char __user *optval, unsigned int optlen) 638{ 639 struct sock *sk = sock->sk; 640 int val; 641 int valbool; 642 struct linger ling; 643 int ret = 0; 644 645 /* 646 * Options without arguments 647 */ 648 649 if (optname == SO_BINDTODEVICE) 650 return sock_setbindtodevice(sk, optval, optlen); 651 652 if (optlen < sizeof(int)) 653 return -EINVAL; 654 655 if (get_user(val, (int __user *)optval)) 656 return -EFAULT; 657 658 valbool = val ? 1 : 0; 659 660 lock_sock(sk); 661 662 switch (optname) { 663 case SO_DEBUG: 664 if (val && !capable(CAP_NET_ADMIN)) 665 ret = -EACCES; 666 else 667 sock_valbool_flag(sk, SOCK_DBG, valbool); 668 break; 669 case SO_REUSEADDR: 670 sk->sk_reuse = (valbool ? SK_CAN_REUSE : SK_NO_REUSE); 671 break; 672 case SO_REUSEPORT: 673 sk->sk_reuseport = valbool; 674 break; 675 case SO_TYPE: 676 case SO_PROTOCOL: 677 case SO_DOMAIN: 678 case SO_ERROR: 679 ret = -ENOPROTOOPT; 680 break; 681 case SO_DONTROUTE: 682 sock_valbool_flag(sk, SOCK_LOCALROUTE, valbool); 683 break; 684 case SO_BROADCAST: 685 sock_valbool_flag(sk, SOCK_BROADCAST, valbool); 686 break; 687 case SO_SNDBUF: 688 /* Don't error on this BSD doesn't and if you think 689 * about it this is right. Otherwise apps have to 690 * play 'guess the biggest size' games. RCVBUF/SNDBUF 691 * are treated in BSD as hints 692 */ 693 val = min_t(u32, val, sysctl_wmem_max); 694set_sndbuf: 695 sk->sk_userlocks |= SOCK_SNDBUF_LOCK; 696 sk->sk_sndbuf = max_t(u32, val * 2, SOCK_MIN_SNDBUF); 697 /* Wake up sending tasks if we upped the value. */ 698 sk->sk_write_space(sk); 699 break; 700 701 case SO_SNDBUFFORCE: 702 if (!capable(CAP_NET_ADMIN)) { 703 ret = -EPERM; 704 break; 705 } 706 goto set_sndbuf; 707 708 case SO_RCVBUF: 709 /* Don't error on this BSD doesn't and if you think 710 * about it this is right. Otherwise apps have to 711 * play 'guess the biggest size' games. RCVBUF/SNDBUF 712 * are treated in BSD as hints 713 */ 714 val = min_t(u32, val, sysctl_rmem_max); 715set_rcvbuf: 716 sk->sk_userlocks |= SOCK_RCVBUF_LOCK; 717 /* 718 * We double it on the way in to account for 719 * "struct sk_buff" etc. overhead. Applications 720 * assume that the SO_RCVBUF setting they make will 721 * allow that much actual data to be received on that 722 * socket. 723 * 724 * Applications are unaware that "struct sk_buff" and 725 * other overheads allocate from the receive buffer 726 * during socket buffer allocation. 727 * 728 * And after considering the possible alternatives, 729 * returning the value we actually used in getsockopt 730 * is the most desirable behavior. 731 */ 732 sk->sk_rcvbuf = max_t(u32, val * 2, SOCK_MIN_RCVBUF); 733 break; 734 735 case SO_RCVBUFFORCE: 736 if (!capable(CAP_NET_ADMIN)) { 737 ret = -EPERM; 738 break; 739 } 740 goto set_rcvbuf; 741 742 case SO_KEEPALIVE: 743#ifdef CONFIG_INET 744 if (sk->sk_protocol == IPPROTO_TCP && 745 sk->sk_type == SOCK_STREAM) 746 tcp_set_keepalive(sk, valbool); 747#endif 748 sock_valbool_flag(sk, SOCK_KEEPOPEN, valbool); 749 break; 750 751 case SO_OOBINLINE: 752 sock_valbool_flag(sk, SOCK_URGINLINE, valbool); 753 break; 754 755 case SO_NO_CHECK: 756 sk->sk_no_check = valbool; 757 break; 758 759 case SO_PRIORITY: 760 if ((val >= 0 && val <= 6) || 761 ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN)) 762 sk->sk_priority = val; 763 else 764 ret = -EPERM; 765 break; 766 767 case SO_LINGER: 768 if (optlen < sizeof(ling)) { 769 ret = -EINVAL; /* 1003.1g */ 770 break; 771 } 772 if (copy_from_user(&ling, optval, sizeof(ling))) { 773 ret = -EFAULT; 774 break; 775 } 776 if (!ling.l_onoff) 777 sock_reset_flag(sk, SOCK_LINGER); 778 else { 779#if (BITS_PER_LONG == 32) 780 if ((unsigned int)ling.l_linger >= MAX_SCHEDULE_TIMEOUT/HZ) 781 sk->sk_lingertime = MAX_SCHEDULE_TIMEOUT; 782 else 783#endif 784 sk->sk_lingertime = (unsigned int)ling.l_linger * HZ; 785 sock_set_flag(sk, SOCK_LINGER); 786 } 787 break; 788 789 case SO_BSDCOMPAT: 790 sock_warn_obsolete_bsdism("setsockopt"); 791 break; 792 793 case SO_PASSCRED: 794 if (valbool) 795 set_bit(SOCK_PASSCRED, &sock->flags); 796 else 797 clear_bit(SOCK_PASSCRED, &sock->flags); 798 break; 799 800 case SO_TIMESTAMP: 801 case SO_TIMESTAMPNS: 802 if (valbool) { 803 if (optname == SO_TIMESTAMP) 804 sock_reset_flag(sk, SOCK_RCVTSTAMPNS); 805 else 806 sock_set_flag(sk, SOCK_RCVTSTAMPNS); 807 sock_set_flag(sk, SOCK_RCVTSTAMP); 808 sock_enable_timestamp(sk, SOCK_TIMESTAMP); 809 } else { 810 sock_reset_flag(sk, SOCK_RCVTSTAMP); 811 sock_reset_flag(sk, SOCK_RCVTSTAMPNS); 812 } 813 break; 814 815 case SO_TIMESTAMPING: 816 if (val & ~SOF_TIMESTAMPING_MASK) { 817 ret = -EINVAL; 818 break; 819 } 820 sock_valbool_flag(sk, SOCK_TIMESTAMPING_TX_HARDWARE, 821 val & SOF_TIMESTAMPING_TX_HARDWARE); 822 sock_valbool_flag(sk, SOCK_TIMESTAMPING_TX_SOFTWARE, 823 val & SOF_TIMESTAMPING_TX_SOFTWARE); 824 sock_valbool_flag(sk, SOCK_TIMESTAMPING_RX_HARDWARE, 825 val & SOF_TIMESTAMPING_RX_HARDWARE); 826 if (val & SOF_TIMESTAMPING_RX_SOFTWARE) 827 sock_enable_timestamp(sk, 828 SOCK_TIMESTAMPING_RX_SOFTWARE); 829 else 830 sock_disable_timestamp(sk, 831 (1UL << SOCK_TIMESTAMPING_RX_SOFTWARE)); 832 sock_valbool_flag(sk, SOCK_TIMESTAMPING_SOFTWARE, 833 val & SOF_TIMESTAMPING_SOFTWARE); 834 sock_valbool_flag(sk, SOCK_TIMESTAMPING_SYS_HARDWARE, 835 val & SOF_TIMESTAMPING_SYS_HARDWARE); 836 sock_valbool_flag(sk, SOCK_TIMESTAMPING_RAW_HARDWARE, 837 val & SOF_TIMESTAMPING_RAW_HARDWARE); 838 break; 839 840 case SO_RCVLOWAT: 841 if (val < 0) 842 val = INT_MAX; 843 sk->sk_rcvlowat = val ? : 1; 844 break; 845 846 case SO_RCVTIMEO: 847 ret = sock_set_timeout(&sk->sk_rcvtimeo, optval, optlen); 848 break; 849 850 case SO_SNDTIMEO: 851 ret = sock_set_timeout(&sk->sk_sndtimeo, optval, optlen); 852 break; 853 854 case SO_ATTACH_FILTER: 855 ret = -EINVAL; 856 if (optlen == sizeof(struct sock_fprog)) { 857 struct sock_fprog fprog; 858 859 ret = -EFAULT; 860 if (copy_from_user(&fprog, optval, sizeof(fprog))) 861 break; 862 863 ret = sk_attach_filter(&fprog, sk); 864 } 865 break; 866 867 case SO_DETACH_FILTER: 868 ret = sk_detach_filter(sk); 869 break; 870 871 case SO_LOCK_FILTER: 872 if (sock_flag(sk, SOCK_FILTER_LOCKED) && !valbool) 873 ret = -EPERM; 874 else 875 sock_valbool_flag(sk, SOCK_FILTER_LOCKED, valbool); 876 break; 877 878 case SO_PASSSEC: 879 if (valbool) 880 set_bit(SOCK_PASSSEC, &sock->flags); 881 else 882 clear_bit(SOCK_PASSSEC, &sock->flags); 883 break; 884 case SO_MARK: 885 if (!ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN)) 886 ret = -EPERM; 887 else 888 sk->sk_mark = val; 889 break; 890 891 /* We implement the SO_SNDLOWAT etc to 892 not be settable (1003.1g 5.3) */ 893 case SO_RXQ_OVFL: 894 sock_valbool_flag(sk, SOCK_RXQ_OVFL, valbool); 895 break; 896 897 case SO_WIFI_STATUS: 898 sock_valbool_flag(sk, SOCK_WIFI_STATUS, valbool); 899 break; 900 901 case SO_PEEK_OFF: 902 if (sock->ops->set_peek_off) 903 sock->ops->set_peek_off(sk, val); 904 else 905 ret = -EOPNOTSUPP; 906 break; 907 908 case SO_NOFCS: 909 sock_valbool_flag(sk, SOCK_NOFCS, valbool); 910 break; 911 912 case SO_SELECT_ERR_QUEUE: 913 sock_valbool_flag(sk, SOCK_SELECT_ERR_QUEUE, valbool); 914 break; 915 916#ifdef CONFIG_NET_LL_RX_POLL 917 case SO_LL: 918 /* allow unprivileged users to decrease the value */ 919 if ((val > sk->sk_ll_usec) && !capable(CAP_NET_ADMIN)) 920 ret = -EPERM; 921 else { 922 if (val < 0) 923 ret = -EINVAL; 924 else 925 sk->sk_ll_usec = val; 926 } 927 break; 928#endif 929 default: 930 ret = -ENOPROTOOPT; 931 break; 932 } 933 release_sock(sk); 934 return ret; 935} 936EXPORT_SYMBOL(sock_setsockopt); 937 938 939void cred_to_ucred(struct pid *pid, const struct cred *cred, 940 struct ucred *ucred) 941{ 942 ucred->pid = pid_vnr(pid); 943 ucred->uid = ucred->gid = -1; 944 if (cred) { 945 struct user_namespace *current_ns = current_user_ns(); 946 947 ucred->uid = from_kuid_munged(current_ns, cred->euid); 948 ucred->gid = from_kgid_munged(current_ns, cred->egid); 949 } 950} 951EXPORT_SYMBOL_GPL(cred_to_ucred); 952 953int sock_getsockopt(struct socket *sock, int level, int optname, 954 char __user *optval, int __user *optlen) 955{ 956 struct sock *sk = sock->sk; 957 958 union { 959 int val; 960 struct linger ling; 961 struct timeval tm; 962 } v; 963 964 int lv = sizeof(int); 965 int len; 966 967 if (get_user(len, optlen)) 968 return -EFAULT; 969 if (len < 0) 970 return -EINVAL; 971 972 memset(&v, 0, sizeof(v)); 973 974 switch (optname) { 975 case SO_DEBUG: 976 v.val = sock_flag(sk, SOCK_DBG); 977 break; 978 979 case SO_DONTROUTE: 980 v.val = sock_flag(sk, SOCK_LOCALROUTE); 981 break; 982 983 case SO_BROADCAST: 984 v.val = sock_flag(sk, SOCK_BROADCAST); 985 break; 986 987 case SO_SNDBUF: 988 v.val = sk->sk_sndbuf; 989 break; 990 991 case SO_RCVBUF: 992 v.val = sk->sk_rcvbuf; 993 break; 994 995 case SO_REUSEADDR: 996 v.val = sk->sk_reuse; 997 break; 998 999 case SO_REUSEPORT: 1000 v.val = sk->sk_reuseport; 1001 break; 1002 1003 case SO_KEEPALIVE: 1004 v.val = sock_flag(sk, SOCK_KEEPOPEN); 1005 break; 1006 1007 case SO_TYPE: 1008 v.val = sk->sk_type; 1009 break; 1010 1011 case SO_PROTOCOL: 1012 v.val = sk->sk_protocol; 1013 break; 1014 1015 case SO_DOMAIN: 1016 v.val = sk->sk_family; 1017 break; 1018 1019 case SO_ERROR: 1020 v.val = -sock_error(sk); 1021 if (v.val == 0) 1022 v.val = xchg(&sk->sk_err_soft, 0); 1023 break; 1024 1025 case SO_OOBINLINE: 1026 v.val = sock_flag(sk, SOCK_URGINLINE); 1027 break; 1028 1029 case SO_NO_CHECK: 1030 v.val = sk->sk_no_check; 1031 break; 1032 1033 case SO_PRIORITY: 1034 v.val = sk->sk_priority; 1035 break; 1036 1037 case SO_LINGER: 1038 lv = sizeof(v.ling); 1039 v.ling.l_onoff = sock_flag(sk, SOCK_LINGER); 1040 v.ling.l_linger = sk->sk_lingertime / HZ; 1041 break; 1042 1043 case SO_BSDCOMPAT: 1044 sock_warn_obsolete_bsdism("getsockopt"); 1045 break; 1046 1047 case SO_TIMESTAMP: 1048 v.val = sock_flag(sk, SOCK_RCVTSTAMP) && 1049 !sock_flag(sk, SOCK_RCVTSTAMPNS); 1050 break; 1051 1052 case SO_TIMESTAMPNS: 1053 v.val = sock_flag(sk, SOCK_RCVTSTAMPNS); 1054 break; 1055 1056 case SO_TIMESTAMPING: 1057 v.val = 0; 1058 if (sock_flag(sk, SOCK_TIMESTAMPING_TX_HARDWARE)) 1059 v.val |= SOF_TIMESTAMPING_TX_HARDWARE; 1060 if (sock_flag(sk, SOCK_TIMESTAMPING_TX_SOFTWARE)) 1061 v.val |= SOF_TIMESTAMPING_TX_SOFTWARE; 1062 if (sock_flag(sk, SOCK_TIMESTAMPING_RX_HARDWARE)) 1063 v.val |= SOF_TIMESTAMPING_RX_HARDWARE; 1064 if (sock_flag(sk, SOCK_TIMESTAMPING_RX_SOFTWARE)) 1065 v.val |= SOF_TIMESTAMPING_RX_SOFTWARE; 1066 if (sock_flag(sk, SOCK_TIMESTAMPING_SOFTWARE)) 1067 v.val |= SOF_TIMESTAMPING_SOFTWARE; 1068 if (sock_flag(sk, SOCK_TIMESTAMPING_SYS_HARDWARE)) 1069 v.val |= SOF_TIMESTAMPING_SYS_HARDWARE; 1070 if (sock_flag(sk, SOCK_TIMESTAMPING_RAW_HARDWARE)) 1071 v.val |= SOF_TIMESTAMPING_RAW_HARDWARE; 1072 break; 1073 1074 case SO_RCVTIMEO: 1075 lv = sizeof(struct timeval); 1076 if (sk->sk_rcvtimeo == MAX_SCHEDULE_TIMEOUT) { 1077 v.tm.tv_sec = 0; 1078 v.tm.tv_usec = 0; 1079 } else { 1080 v.tm.tv_sec = sk->sk_rcvtimeo / HZ; 1081 v.tm.tv_usec = ((sk->sk_rcvtimeo % HZ) * 1000000) / HZ; 1082 } 1083 break; 1084 1085 case SO_SNDTIMEO: 1086 lv = sizeof(struct timeval); 1087 if (sk->sk_sndtimeo == MAX_SCHEDULE_TIMEOUT) { 1088 v.tm.tv_sec = 0; 1089 v.tm.tv_usec = 0; 1090 } else { 1091 v.tm.tv_sec = sk->sk_sndtimeo / HZ; 1092 v.tm.tv_usec = ((sk->sk_sndtimeo % HZ) * 1000000) / HZ; 1093 } 1094 break; 1095 1096 case SO_RCVLOWAT: 1097 v.val = sk->sk_rcvlowat; 1098 break; 1099 1100 case SO_SNDLOWAT: 1101 v.val = 1; 1102 break; 1103 1104 case SO_PASSCRED: 1105 v.val = !!test_bit(SOCK_PASSCRED, &sock->flags); 1106 break; 1107 1108 case SO_PEERCRED: 1109 { 1110 struct ucred peercred; 1111 if (len > sizeof(peercred)) 1112 len = sizeof(peercred); 1113 cred_to_ucred(sk->sk_peer_pid, sk->sk_peer_cred, &peercred); 1114 if (copy_to_user(optval, &peercred, len)) 1115 return -EFAULT; 1116 goto lenout; 1117 } 1118 1119 case SO_PEERNAME: 1120 { 1121 char address[128]; 1122 1123 if (sock->ops->getname(sock, (struct sockaddr *)address, &lv, 2)) 1124 return -ENOTCONN; 1125 if (lv < len) 1126 return -EINVAL; 1127 if (copy_to_user(optval, address, len)) 1128 return -EFAULT; 1129 goto lenout; 1130 } 1131 1132 /* Dubious BSD thing... Probably nobody even uses it, but 1133 * the UNIX standard wants it for whatever reason... -DaveM 1134 */ 1135 case SO_ACCEPTCONN: 1136 v.val = sk->sk_state == TCP_LISTEN; 1137 break; 1138 1139 case SO_PASSSEC: 1140 v.val = !!test_bit(SOCK_PASSSEC, &sock->flags); 1141 break; 1142 1143 case SO_PEERSEC: 1144 return security_socket_getpeersec_stream(sock, optval, optlen, len); 1145 1146 case SO_MARK: 1147 v.val = sk->sk_mark; 1148 break; 1149 1150 case SO_RXQ_OVFL: 1151 v.val = sock_flag(sk, SOCK_RXQ_OVFL); 1152 break; 1153 1154 case SO_WIFI_STATUS: 1155 v.val = sock_flag(sk, SOCK_WIFI_STATUS); 1156 break; 1157 1158 case SO_PEEK_OFF: 1159 if (!sock->ops->set_peek_off) 1160 return -EOPNOTSUPP; 1161 1162 v.val = sk->sk_peek_off; 1163 break; 1164 case SO_NOFCS: 1165 v.val = sock_flag(sk, SOCK_NOFCS); 1166 break; 1167 1168 case SO_BINDTODEVICE: 1169 return sock_getbindtodevice(sk, optval, optlen, len); 1170 1171 case SO_GET_FILTER: 1172 len = sk_get_filter(sk, (struct sock_filter __user *)optval, len); 1173 if (len < 0) 1174 return len; 1175 1176 goto lenout; 1177 1178 case SO_LOCK_FILTER: 1179 v.val = sock_flag(sk, SOCK_FILTER_LOCKED); 1180 break; 1181 1182 case SO_SELECT_ERR_QUEUE: 1183 v.val = sock_flag(sk, SOCK_SELECT_ERR_QUEUE); 1184 break; 1185 1186#ifdef CONFIG_NET_LL_RX_POLL 1187 case SO_LL: 1188 v.val = sk->sk_ll_usec; 1189 break; 1190#endif 1191 1192 default: 1193 return -ENOPROTOOPT; 1194 } 1195 1196 if (len > lv) 1197 len = lv; 1198 if (copy_to_user(optval, &v, len)) 1199 return -EFAULT; 1200lenout: 1201 if (put_user(len, optlen)) 1202 return -EFAULT; 1203 return 0; 1204} 1205 1206/* 1207 * Initialize an sk_lock. 1208 * 1209 * (We also register the sk_lock with the lock validator.) 1210 */ 1211static inline void sock_lock_init(struct sock *sk) 1212{ 1213 sock_lock_init_class_and_name(sk, 1214 af_family_slock_key_strings[sk->sk_family], 1215 af_family_slock_keys + sk->sk_family, 1216 af_family_key_strings[sk->sk_family], 1217 af_family_keys + sk->sk_family); 1218} 1219 1220/* 1221 * Copy all fields from osk to nsk but nsk->sk_refcnt must not change yet, 1222 * even temporarly, because of RCU lookups. sk_node should also be left as is. 1223 * We must not copy fields between sk_dontcopy_begin and sk_dontcopy_end 1224 */ 1225static void sock_copy(struct sock *nsk, const struct sock *osk) 1226{ 1227#ifdef CONFIG_SECURITY_NETWORK 1228 void *sptr = nsk->sk_security; 1229#endif 1230 memcpy(nsk, osk, offsetof(struct sock, sk_dontcopy_begin)); 1231 1232 memcpy(&nsk->sk_dontcopy_end, &osk->sk_dontcopy_end, 1233 osk->sk_prot->obj_size - offsetof(struct sock, sk_dontcopy_end)); 1234 1235#ifdef CONFIG_SECURITY_NETWORK 1236 nsk->sk_security = sptr; 1237 security_sk_clone(osk, nsk); 1238#endif 1239} 1240 1241void sk_prot_clear_portaddr_nulls(struct sock *sk, int size) 1242{ 1243 unsigned long nulls1, nulls2; 1244 1245 nulls1 = offsetof(struct sock, __sk_common.skc_node.next); 1246 nulls2 = offsetof(struct sock, __sk_common.skc_portaddr_node.next); 1247 if (nulls1 > nulls2) 1248 swap(nulls1, nulls2); 1249 1250 if (nulls1 != 0) 1251 memset((char *)sk, 0, nulls1); 1252 memset((char *)sk + nulls1 + sizeof(void *), 0, 1253 nulls2 - nulls1 - sizeof(void *)); 1254 memset((char *)sk + nulls2 + sizeof(void *), 0, 1255 size - nulls2 - sizeof(void *)); 1256} 1257EXPORT_SYMBOL(sk_prot_clear_portaddr_nulls); 1258 1259static struct sock *sk_prot_alloc(struct proto *prot, gfp_t priority, 1260 int family) 1261{ 1262 struct sock *sk; 1263 struct kmem_cache *slab; 1264 1265 slab = prot->slab; 1266 if (slab != NULL) { 1267 sk = kmem_cache_alloc(slab, priority & ~__GFP_ZERO); 1268 if (!sk) 1269 return sk; 1270 if (priority & __GFP_ZERO) { 1271 if (prot->clear_sk) 1272 prot->clear_sk(sk, prot->obj_size); 1273 else 1274 sk_prot_clear_nulls(sk, prot->obj_size); 1275 } 1276 } else 1277 sk = kmalloc(prot->obj_size, priority); 1278 1279 if (sk != NULL) { 1280 kmemcheck_annotate_bitfield(sk, flags); 1281 1282 if (security_sk_alloc(sk, family, priority)) 1283 goto out_free; 1284 1285 if (!try_module_get(prot->owner)) 1286 goto out_free_sec; 1287 sk_tx_queue_clear(sk); 1288 } 1289 1290 return sk; 1291 1292out_free_sec: 1293 security_sk_free(sk); 1294out_free: 1295 if (slab != NULL) 1296 kmem_cache_free(slab, sk); 1297 else 1298 kfree(sk); 1299 return NULL; 1300} 1301 1302static void sk_prot_free(struct proto *prot, struct sock *sk) 1303{ 1304 struct kmem_cache *slab; 1305 struct module *owner; 1306 1307 owner = prot->owner; 1308 slab = prot->slab; 1309 1310 security_sk_free(sk); 1311 if (slab != NULL) 1312 kmem_cache_free(slab, sk); 1313 else 1314 kfree(sk); 1315 module_put(owner); 1316} 1317 1318#if IS_ENABLED(CONFIG_NET_CLS_CGROUP) 1319void sock_update_classid(struct sock *sk) 1320{ 1321 u32 classid; 1322 1323 classid = task_cls_classid(current); 1324 if (classid != sk->sk_classid) 1325 sk->sk_classid = classid; 1326} 1327EXPORT_SYMBOL(sock_update_classid); 1328#endif 1329 1330#if IS_ENABLED(CONFIG_NETPRIO_CGROUP) 1331void sock_update_netprioidx(struct sock *sk) 1332{ 1333 if (in_interrupt()) 1334 return; 1335 1336 sk->sk_cgrp_prioidx = task_netprioidx(current); 1337} 1338EXPORT_SYMBOL_GPL(sock_update_netprioidx); 1339#endif 1340 1341/** 1342 * sk_alloc - All socket objects are allocated here 1343 * @net: the applicable net namespace 1344 * @family: protocol family 1345 * @priority: for allocation (%GFP_KERNEL, %GFP_ATOMIC, etc) 1346 * @prot: struct proto associated with this new sock instance 1347 */ 1348struct sock *sk_alloc(struct net *net, int family, gfp_t priority, 1349 struct proto *prot) 1350{ 1351 struct sock *sk; 1352 1353 sk = sk_prot_alloc(prot, priority | __GFP_ZERO, family); 1354 if (sk) { 1355 sk->sk_family = family; 1356 /* 1357 * See comment in struct sock definition to understand 1358 * why we need sk_prot_creator -acme 1359 */ 1360 sk->sk_prot = sk->sk_prot_creator = prot; 1361 sock_lock_init(sk); 1362 sock_net_set(sk, get_net(net)); 1363 atomic_set(&sk->sk_wmem_alloc, 1); 1364 1365 sock_update_classid(sk); 1366 sock_update_netprioidx(sk); 1367 } 1368 1369 return sk; 1370} 1371EXPORT_SYMBOL(sk_alloc); 1372 1373static void __sk_free(struct sock *sk) 1374{ 1375 struct sk_filter *filter; 1376 1377 if (sk->sk_destruct) 1378 sk->sk_destruct(sk); 1379 1380 filter = rcu_dereference_check(sk->sk_filter, 1381 atomic_read(&sk->sk_wmem_alloc) == 0); 1382 if (filter) { 1383 sk_filter_uncharge(sk, filter); 1384 RCU_INIT_POINTER(sk->sk_filter, NULL); 1385 } 1386 1387 sock_disable_timestamp(sk, SK_FLAGS_TIMESTAMP); 1388 1389 if (atomic_read(&sk->sk_omem_alloc)) 1390 pr_debug("%s: optmem leakage (%d bytes) detected\n", 1391 __func__, atomic_read(&sk->sk_omem_alloc)); 1392 1393 if (sk->sk_peer_cred) 1394 put_cred(sk->sk_peer_cred); 1395 put_pid(sk->sk_peer_pid); 1396 put_net(sock_net(sk)); 1397 sk_prot_free(sk->sk_prot_creator, sk); 1398} 1399 1400void sk_free(struct sock *sk) 1401{ 1402 /* 1403 * We subtract one from sk_wmem_alloc and can know if 1404 * some packets are still in some tx queue. 1405 * If not null, sock_wfree() will call __sk_free(sk) later 1406 */ 1407 if (atomic_dec_and_test(&sk->sk_wmem_alloc)) 1408 __sk_free(sk); 1409} 1410EXPORT_SYMBOL(sk_free); 1411 1412/* 1413 * Last sock_put should drop reference to sk->sk_net. It has already 1414 * been dropped in sk_change_net. Taking reference to stopping namespace 1415 * is not an option. 1416 * Take reference to a socket to remove it from hash _alive_ and after that 1417 * destroy it in the context of init_net. 1418 */ 1419void sk_release_kernel(struct sock *sk) 1420{ 1421 if (sk == NULL || sk->sk_socket == NULL) 1422 return; 1423 1424 sock_hold(sk); 1425 sock_release(sk->sk_socket); 1426 release_net(sock_net(sk)); 1427 sock_net_set(sk, get_net(&init_net)); 1428 sock_put(sk); 1429} 1430EXPORT_SYMBOL(sk_release_kernel); 1431 1432static void sk_update_clone(const struct sock *sk, struct sock *newsk) 1433{ 1434 if (mem_cgroup_sockets_enabled && sk->sk_cgrp) 1435 sock_update_memcg(newsk); 1436} 1437 1438/** 1439 * sk_clone_lock - clone a socket, and lock its clone 1440 * @sk: the socket to clone 1441 * @priority: for allocation (%GFP_KERNEL, %GFP_ATOMIC, etc) 1442 * 1443 * Caller must unlock socket even in error path (bh_unlock_sock(newsk)) 1444 */ 1445struct sock *sk_clone_lock(const struct sock *sk, const gfp_t priority) 1446{ 1447 struct sock *newsk; 1448 1449 newsk = sk_prot_alloc(sk->sk_prot, priority, sk->sk_family); 1450 if (newsk != NULL) { 1451 struct sk_filter *filter; 1452 1453 sock_copy(newsk, sk); 1454 1455 /* SANITY */ 1456 get_net(sock_net(newsk)); 1457 sk_node_init(&newsk->sk_node); 1458 sock_lock_init(newsk); 1459 bh_lock_sock(newsk); 1460 newsk->sk_backlog.head = newsk->sk_backlog.tail = NULL; 1461 newsk->sk_backlog.len = 0; 1462 1463 atomic_set(&newsk->sk_rmem_alloc, 0); 1464 /* 1465 * sk_wmem_alloc set to one (see sk_free() and sock_wfree()) 1466 */ 1467 atomic_set(&newsk->sk_wmem_alloc, 1); 1468 atomic_set(&newsk->sk_omem_alloc, 0); 1469 skb_queue_head_init(&newsk->sk_receive_queue); 1470 skb_queue_head_init(&newsk->sk_write_queue); 1471#ifdef CONFIG_NET_DMA 1472 skb_queue_head_init(&newsk->sk_async_wait_queue); 1473#endif 1474 1475 spin_lock_init(&newsk->sk_dst_lock); 1476 rwlock_init(&newsk->sk_callback_lock); 1477 lockdep_set_class_and_name(&newsk->sk_callback_lock, 1478 af_callback_keys + newsk->sk_family, 1479 af_family_clock_key_strings[newsk->sk_family]); 1480 1481 newsk->sk_dst_cache = NULL; 1482 newsk->sk_wmem_queued = 0; 1483 newsk->sk_forward_alloc = 0; 1484 newsk->sk_send_head = NULL; 1485 newsk->sk_userlocks = sk->sk_userlocks & ~SOCK_BINDPORT_LOCK; 1486 1487 sock_reset_flag(newsk, SOCK_DONE); 1488 skb_queue_head_init(&newsk->sk_error_queue); 1489 1490 filter = rcu_dereference_protected(newsk->sk_filter, 1); 1491 if (filter != NULL) 1492 sk_filter_charge(newsk, filter); 1493 1494 if (unlikely(xfrm_sk_clone_policy(newsk))) { 1495 /* It is still raw copy of parent, so invalidate 1496 * destructor and make plain sk_free() */ 1497 newsk->sk_destruct = NULL; 1498 bh_unlock_sock(newsk); 1499 sk_free(newsk); 1500 newsk = NULL; 1501 goto out; 1502 } 1503 1504 newsk->sk_err = 0; 1505 newsk->sk_priority = 0; 1506 /* 1507 * Before updating sk_refcnt, we must commit prior changes to memory 1508 * (Documentation/RCU/rculist_nulls.txt for details) 1509 */ 1510 smp_wmb(); 1511 atomic_set(&newsk->sk_refcnt, 2); 1512 1513 /* 1514 * Increment the counter in the same struct proto as the master 1515 * sock (sk_refcnt_debug_inc uses newsk->sk_prot->socks, that 1516 * is the same as sk->sk_prot->socks, as this field was copied 1517 * with memcpy). 1518 * 1519 * This _changes_ the previous behaviour, where 1520 * tcp_create_openreq_child always was incrementing the 1521 * equivalent to tcp_prot->socks (inet_sock_nr), so this have 1522 * to be taken into account in all callers. -acme 1523 */ 1524 sk_refcnt_debug_inc(newsk); 1525 sk_set_socket(newsk, NULL); 1526 newsk->sk_wq = NULL; 1527 1528 sk_update_clone(sk, newsk); 1529 1530 if (newsk->sk_prot->sockets_allocated) 1531 sk_sockets_allocated_inc(newsk); 1532 1533 if (newsk->sk_flags & SK_FLAGS_TIMESTAMP) 1534 net_enable_timestamp(); 1535 } 1536out: 1537 return newsk; 1538} 1539EXPORT_SYMBOL_GPL(sk_clone_lock); 1540 1541void sk_setup_caps(struct sock *sk, struct dst_entry *dst) 1542{ 1543 __sk_dst_set(sk, dst); 1544 sk->sk_route_caps = dst->dev->features; 1545 if (sk->sk_route_caps & NETIF_F_GSO) 1546 sk->sk_route_caps |= NETIF_F_GSO_SOFTWARE; 1547 sk->sk_route_caps &= ~sk->sk_route_nocaps; 1548 if (sk_can_gso(sk)) { 1549 if (dst->header_len) { 1550 sk->sk_route_caps &= ~NETIF_F_GSO_MASK; 1551 } else { 1552 sk->sk_route_caps |= NETIF_F_SG | NETIF_F_HW_CSUM; 1553 sk->sk_gso_max_size = dst->dev->gso_max_size; 1554 sk->sk_gso_max_segs = dst->dev->gso_max_segs; 1555 } 1556 } 1557} 1558EXPORT_SYMBOL_GPL(sk_setup_caps); 1559 1560/* 1561 * Simple resource managers for sockets. 1562 */ 1563 1564 1565/* 1566 * Write buffer destructor automatically called from kfree_skb. 1567 */ 1568void sock_wfree(struct sk_buff *skb) 1569{ 1570 struct sock *sk = skb->sk; 1571 unsigned int len = skb->truesize; 1572 1573 if (!sock_flag(sk, SOCK_USE_WRITE_QUEUE)) { 1574 /* 1575 * Keep a reference on sk_wmem_alloc, this will be released 1576 * after sk_write_space() call 1577 */ 1578 atomic_sub(len - 1, &sk->sk_wmem_alloc); 1579 sk->sk_write_space(sk); 1580 len = 1; 1581 } 1582 /* 1583 * if sk_wmem_alloc reaches 0, we must finish what sk_free() 1584 * could not do because of in-flight packets 1585 */ 1586 if (atomic_sub_and_test(len, &sk->sk_wmem_alloc)) 1587 __sk_free(sk); 1588} 1589EXPORT_SYMBOL(sock_wfree); 1590 1591/* 1592 * Read buffer destructor automatically called from kfree_skb. 1593 */ 1594void sock_rfree(struct sk_buff *skb) 1595{ 1596 struct sock *sk = skb->sk; 1597 unsigned int len = skb->truesize; 1598 1599 atomic_sub(len, &sk->sk_rmem_alloc); 1600 sk_mem_uncharge(sk, len); 1601} 1602EXPORT_SYMBOL(sock_rfree); 1603 1604void sock_edemux(struct sk_buff *skb) 1605{ 1606 struct sock *sk = skb->sk; 1607 1608#ifdef CONFIG_INET 1609 if (sk->sk_state == TCP_TIME_WAIT) 1610 inet_twsk_put(inet_twsk(sk)); 1611 else 1612#endif 1613 sock_put(sk); 1614} 1615EXPORT_SYMBOL(sock_edemux); 1616 1617kuid_t sock_i_uid(struct sock *sk) 1618{ 1619 kuid_t uid; 1620 1621 read_lock_bh(&sk->sk_callback_lock); 1622 uid = sk->sk_socket ? SOCK_INODE(sk->sk_socket)->i_uid : GLOBAL_ROOT_UID; 1623 read_unlock_bh(&sk->sk_callback_lock); 1624 return uid; 1625} 1626EXPORT_SYMBOL(sock_i_uid); 1627 1628unsigned long sock_i_ino(struct sock *sk) 1629{ 1630 unsigned long ino; 1631 1632 read_lock_bh(&sk->sk_callback_lock); 1633 ino = sk->sk_socket ? SOCK_INODE(sk->sk_socket)->i_ino : 0; 1634 read_unlock_bh(&sk->sk_callback_lock); 1635 return ino; 1636} 1637EXPORT_SYMBOL(sock_i_ino); 1638 1639/* 1640 * Allocate a skb from the socket's send buffer. 1641 */ 1642struct sk_buff *sock_wmalloc(struct sock *sk, unsigned long size, int force, 1643 gfp_t priority) 1644{ 1645 if (force || atomic_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf) { 1646 struct sk_buff *skb = alloc_skb(size, priority); 1647 if (skb) { 1648 skb_set_owner_w(skb, sk); 1649 return skb; 1650 } 1651 } 1652 return NULL; 1653} 1654EXPORT_SYMBOL(sock_wmalloc); 1655 1656/* 1657 * Allocate a skb from the socket's receive buffer. 1658 */ 1659struct sk_buff *sock_rmalloc(struct sock *sk, unsigned long size, int force, 1660 gfp_t priority) 1661{ 1662 if (force || atomic_read(&sk->sk_rmem_alloc) < sk->sk_rcvbuf) { 1663 struct sk_buff *skb = alloc_skb(size, priority); 1664 if (skb) { 1665 skb_set_owner_r(skb, sk); 1666 return skb; 1667 } 1668 } 1669 return NULL; 1670} 1671 1672/* 1673 * Allocate a memory block from the socket's option memory buffer. 1674 */ 1675void *sock_kmalloc(struct sock *sk, int size, gfp_t priority) 1676{ 1677 if ((unsigned int)size <= sysctl_optmem_max && 1678 atomic_read(&sk->sk_omem_alloc) + size < sysctl_optmem_max) { 1679 void *mem; 1680 /* First do the add, to avoid the race if kmalloc 1681 * might sleep. 1682 */ 1683 atomic_add(size, &sk->sk_omem_alloc); 1684 mem = kmalloc(size, priority); 1685 if (mem) 1686 return mem; 1687 atomic_sub(size, &sk->sk_omem_alloc); 1688 } 1689 return NULL; 1690} 1691EXPORT_SYMBOL(sock_kmalloc); 1692 1693/* 1694 * Free an option memory block. 1695 */ 1696void sock_kfree_s(struct sock *sk, void *mem, int size) 1697{ 1698 kfree(mem); 1699 atomic_sub(size, &sk->sk_omem_alloc); 1700} 1701EXPORT_SYMBOL(sock_kfree_s); 1702 1703/* It is almost wait_for_tcp_memory minus release_sock/lock_sock. 1704 I think, these locks should be removed for datagram sockets. 1705 */ 1706static long sock_wait_for_wmem(struct sock *sk, long timeo) 1707{ 1708 DEFINE_WAIT(wait); 1709 1710 clear_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags); 1711 for (;;) { 1712 if (!timeo) 1713 break; 1714 if (signal_pending(current)) 1715 break; 1716 set_bit(SOCK_NOSPACE, &sk->sk_socket->flags); 1717 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE); 1718 if (atomic_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf) 1719 break; 1720 if (sk->sk_shutdown & SEND_SHUTDOWN) 1721 break; 1722 if (sk->sk_err) 1723 break; 1724 timeo = schedule_timeout(timeo); 1725 } 1726 finish_wait(sk_sleep(sk), &wait); 1727 return timeo; 1728} 1729 1730 1731/* 1732 * Generic send/receive buffer handlers 1733 */ 1734 1735struct sk_buff *sock_alloc_send_pskb(struct sock *sk, unsigned long header_len, 1736 unsigned long data_len, int noblock, 1737 int *errcode) 1738{ 1739 struct sk_buff *skb; 1740 gfp_t gfp_mask; 1741 long timeo; 1742 int err; 1743 int npages = (data_len + (PAGE_SIZE - 1)) >> PAGE_SHIFT; 1744 1745 err = -EMSGSIZE; 1746 if (npages > MAX_SKB_FRAGS) 1747 goto failure; 1748 1749 gfp_mask = sk->sk_allocation; 1750 if (gfp_mask & __GFP_WAIT) 1751 gfp_mask |= __GFP_REPEAT; 1752 1753 timeo = sock_sndtimeo(sk, noblock); 1754 while (1) { 1755 err = sock_error(sk); 1756 if (err != 0) 1757 goto failure; 1758 1759 err = -EPIPE; 1760 if (sk->sk_shutdown & SEND_SHUTDOWN) 1761 goto failure; 1762 1763 if (atomic_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf) { 1764 skb = alloc_skb(header_len, gfp_mask); 1765 if (skb) { 1766 int i; 1767 1768 /* No pages, we're done... */ 1769 if (!data_len) 1770 break; 1771 1772 skb->truesize += data_len; 1773 skb_shinfo(skb)->nr_frags = npages; 1774 for (i = 0; i < npages; i++) { 1775 struct page *page; 1776 1777 page = alloc_pages(sk->sk_allocation, 0); 1778 if (!page) { 1779 err = -ENOBUFS; 1780 skb_shinfo(skb)->nr_frags = i; 1781 kfree_skb(skb); 1782 goto failure; 1783 } 1784 1785 __skb_fill_page_desc(skb, i, 1786 page, 0, 1787 (data_len >= PAGE_SIZE ? 1788 PAGE_SIZE : 1789 data_len)); 1790 data_len -= PAGE_SIZE; 1791 } 1792 1793 /* Full success... */ 1794 break; 1795 } 1796 err = -ENOBUFS; 1797 goto failure; 1798 } 1799 set_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags); 1800 set_bit(SOCK_NOSPACE, &sk->sk_socket->flags); 1801 err = -EAGAIN; 1802 if (!timeo) 1803 goto failure; 1804 if (signal_pending(current)) 1805 goto interrupted; 1806 timeo = sock_wait_for_wmem(sk, timeo); 1807 } 1808 1809 skb_set_owner_w(skb, sk); 1810 return skb; 1811 1812interrupted: 1813 err = sock_intr_errno(timeo); 1814failure: 1815 *errcode = err; 1816 return NULL; 1817} 1818EXPORT_SYMBOL(sock_alloc_send_pskb); 1819 1820struct sk_buff *sock_alloc_send_skb(struct sock *sk, unsigned long size, 1821 int noblock, int *errcode) 1822{ 1823 return sock_alloc_send_pskb(sk, size, 0, noblock, errcode); 1824} 1825EXPORT_SYMBOL(sock_alloc_send_skb); 1826 1827/* On 32bit arches, an skb frag is limited to 2^15 */ 1828#define SKB_FRAG_PAGE_ORDER get_order(32768) 1829 1830bool sk_page_frag_refill(struct sock *sk, struct page_frag *pfrag) 1831{ 1832 int order; 1833 1834 if (pfrag->page) { 1835 if (atomic_read(&pfrag->page->_count) == 1) { 1836 pfrag->offset = 0; 1837 return true; 1838 } 1839 if (pfrag->offset < pfrag->size) 1840 return true; 1841 put_page(pfrag->page); 1842 } 1843 1844 /* We restrict high order allocations to users that can afford to wait */ 1845 order = (sk->sk_allocation & __GFP_WAIT) ? SKB_FRAG_PAGE_ORDER : 0; 1846 1847 do { 1848 gfp_t gfp = sk->sk_allocation; 1849 1850 if (order) 1851 gfp |= __GFP_COMP | __GFP_NOWARN; 1852 pfrag->page = alloc_pages(gfp, order); 1853 if (likely(pfrag->page)) { 1854 pfrag->offset = 0; 1855 pfrag->size = PAGE_SIZE << order; 1856 return true; 1857 } 1858 } while (--order >= 0); 1859 1860 sk_enter_memory_pressure(sk); 1861 sk_stream_moderate_sndbuf(sk); 1862 return false; 1863} 1864EXPORT_SYMBOL(sk_page_frag_refill); 1865 1866static void __lock_sock(struct sock *sk) 1867 __releases(&sk->sk_lock.slock) 1868 __acquires(&sk->sk_lock.slock) 1869{ 1870 DEFINE_WAIT(wait); 1871 1872 for (;;) { 1873 prepare_to_wait_exclusive(&sk->sk_lock.wq, &wait, 1874 TASK_UNINTERRUPTIBLE); 1875 spin_unlock_bh(&sk->sk_lock.slock); 1876 schedule(); 1877 spin_lock_bh(&sk->sk_lock.slock); 1878 if (!sock_owned_by_user(sk)) 1879 break; 1880 } 1881 finish_wait(&sk->sk_lock.wq, &wait); 1882} 1883 1884static void __release_sock(struct sock *sk) 1885 __releases(&sk->sk_lock.slock) 1886 __acquires(&sk->sk_lock.slock) 1887{ 1888 struct sk_buff *skb = sk->sk_backlog.head; 1889 1890 do { 1891 sk->sk_backlog.head = sk->sk_backlog.tail = NULL; 1892 bh_unlock_sock(sk); 1893 1894 do { 1895 struct sk_buff *next = skb->next; 1896 1897 prefetch(next); 1898 WARN_ON_ONCE(skb_dst_is_noref(skb)); 1899 skb->next = NULL; 1900 sk_backlog_rcv(sk, skb); 1901 1902 /* 1903 * We are in process context here with softirqs 1904 * disabled, use cond_resched_softirq() to preempt. 1905 * This is safe to do because we've taken the backlog 1906 * queue private: 1907 */ 1908 cond_resched_softirq(); 1909 1910 skb = next; 1911 } while (skb != NULL); 1912 1913 bh_lock_sock(sk); 1914 } while ((skb = sk->sk_backlog.head) != NULL); 1915 1916 /* 1917 * Doing the zeroing here guarantee we can not loop forever 1918 * while a wild producer attempts to flood us. 1919 */ 1920 sk->sk_backlog.len = 0; 1921} 1922 1923/** 1924 * sk_wait_data - wait for data to arrive at sk_receive_queue 1925 * @sk: sock to wait on 1926 * @timeo: for how long 1927 * 1928 * Now socket state including sk->sk_err is changed only under lock, 1929 * hence we may omit checks after joining wait queue. 1930 * We check receive queue before schedule() only as optimization; 1931 * it is very likely that release_sock() added new data. 1932 */ 1933int sk_wait_data(struct sock *sk, long *timeo) 1934{ 1935 int rc; 1936 DEFINE_WAIT(wait); 1937 1938 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE); 1939 set_bit(SOCK_ASYNC_WAITDATA, &sk->sk_socket->flags); 1940 rc = sk_wait_event(sk, timeo, !skb_queue_empty(&sk->sk_receive_queue)); 1941 clear_bit(SOCK_ASYNC_WAITDATA, &sk->sk_socket->flags); 1942 finish_wait(sk_sleep(sk), &wait); 1943 return rc; 1944} 1945EXPORT_SYMBOL(sk_wait_data); 1946 1947/** 1948 * __sk_mem_schedule - increase sk_forward_alloc and memory_allocated 1949 * @sk: socket 1950 * @size: memory size to allocate 1951 * @kind: allocation type 1952 * 1953 * If kind is SK_MEM_SEND, it means wmem allocation. Otherwise it means 1954 * rmem allocation. This function assumes that protocols which have 1955 * memory_pressure use sk_wmem_queued as write buffer accounting. 1956 */ 1957int __sk_mem_schedule(struct sock *sk, int size, int kind) 1958{ 1959 struct proto *prot = sk->sk_prot; 1960 int amt = sk_mem_pages(size); 1961 long allocated; 1962 int parent_status = UNDER_LIMIT; 1963 1964 sk->sk_forward_alloc += amt * SK_MEM_QUANTUM; 1965 1966 allocated = sk_memory_allocated_add(sk, amt, &parent_status); 1967 1968 /* Under limit. */ 1969 if (parent_status == UNDER_LIMIT && 1970 allocated <= sk_prot_mem_limits(sk, 0)) { 1971 sk_leave_memory_pressure(sk); 1972 return 1; 1973 } 1974 1975 /* Under pressure. (we or our parents) */ 1976 if ((parent_status > SOFT_LIMIT) || 1977 allocated > sk_prot_mem_limits(sk, 1)) 1978 sk_enter_memory_pressure(sk); 1979 1980 /* Over hard limit (we or our parents) */ 1981 if ((parent_status == OVER_LIMIT) || 1982 (allocated > sk_prot_mem_limits(sk, 2))) 1983 goto suppress_allocation; 1984 1985 /* guarantee minimum buffer size under pressure */ 1986 if (kind == SK_MEM_RECV) { 1987 if (atomic_read(&sk->sk_rmem_alloc) < prot->sysctl_rmem[0]) 1988 return 1; 1989 1990 } else { /* SK_MEM_SEND */ 1991 if (sk->sk_type == SOCK_STREAM) { 1992 if (sk->sk_wmem_queued < prot->sysctl_wmem[0]) 1993 return 1; 1994 } else if (atomic_read(&sk->sk_wmem_alloc) < 1995 prot->sysctl_wmem[0]) 1996 return 1; 1997 } 1998 1999 if (sk_has_memory_pressure(sk)) { 2000 int alloc; 2001 2002 if (!sk_under_memory_pressure(sk)) 2003 return 1; 2004 alloc = sk_sockets_allocated_read_positive(sk); 2005 if (sk_prot_mem_limits(sk, 2) > alloc * 2006 sk_mem_pages(sk->sk_wmem_queued + 2007 atomic_read(&sk->sk_rmem_alloc) + 2008 sk->sk_forward_alloc)) 2009 return 1; 2010 } 2011 2012suppress_allocation: 2013 2014 if (kind == SK_MEM_SEND && sk->sk_type == SOCK_STREAM) { 2015 sk_stream_moderate_sndbuf(sk); 2016 2017 /* Fail only if socket is _under_ its sndbuf. 2018 * In this case we cannot block, so that we have to fail. 2019 */ 2020 if (sk->sk_wmem_queued + size >= sk->sk_sndbuf) 2021 return 1; 2022 } 2023 2024 trace_sock_exceed_buf_limit(sk, prot, allocated); 2025 2026 /* Alas. Undo changes. */ 2027 sk->sk_forward_alloc -= amt * SK_MEM_QUANTUM; 2028 2029 sk_memory_allocated_sub(sk, amt); 2030 2031 return 0; 2032} 2033EXPORT_SYMBOL(__sk_mem_schedule); 2034 2035/** 2036 * __sk_reclaim - reclaim memory_allocated 2037 * @sk: socket 2038 */ 2039void __sk_mem_reclaim(struct sock *sk) 2040{ 2041 sk_memory_allocated_sub(sk, 2042 sk->sk_forward_alloc >> SK_MEM_QUANTUM_SHIFT); 2043 sk->sk_forward_alloc &= SK_MEM_QUANTUM - 1; 2044 2045 if (sk_under_memory_pressure(sk) && 2046 (sk_memory_allocated(sk) < sk_prot_mem_limits(sk, 0))) 2047 sk_leave_memory_pressure(sk); 2048} 2049EXPORT_SYMBOL(__sk_mem_reclaim); 2050 2051 2052/* 2053 * Set of default routines for initialising struct proto_ops when 2054 * the protocol does not support a particular function. In certain 2055 * cases where it makes no sense for a protocol to have a "do nothing" 2056 * function, some default processing is provided. 2057 */ 2058 2059int sock_no_bind(struct socket *sock, struct sockaddr *saddr, int len) 2060{ 2061 return -EOPNOTSUPP; 2062} 2063EXPORT_SYMBOL(sock_no_bind); 2064 2065int sock_no_connect(struct socket *sock, struct sockaddr *saddr, 2066 int len, int flags) 2067{ 2068 return -EOPNOTSUPP; 2069} 2070EXPORT_SYMBOL(sock_no_connect); 2071 2072int sock_no_socketpair(struct socket *sock1, struct socket *sock2) 2073{ 2074 return -EOPNOTSUPP; 2075} 2076EXPORT_SYMBOL(sock_no_socketpair); 2077 2078int sock_no_accept(struct socket *sock, struct socket *newsock, int flags) 2079{ 2080 return -EOPNOTSUPP; 2081} 2082EXPORT_SYMBOL(sock_no_accept); 2083 2084int sock_no_getname(struct socket *sock, struct sockaddr *saddr, 2085 int *len, int peer) 2086{ 2087 return -EOPNOTSUPP; 2088} 2089EXPORT_SYMBOL(sock_no_getname); 2090 2091unsigned int sock_no_poll(struct file *file, struct socket *sock, poll_table *pt) 2092{ 2093 return 0; 2094} 2095EXPORT_SYMBOL(sock_no_poll); 2096 2097int sock_no_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg) 2098{ 2099 return -EOPNOTSUPP; 2100} 2101EXPORT_SYMBOL(sock_no_ioctl); 2102 2103int sock_no_listen(struct socket *sock, int backlog) 2104{ 2105 return -EOPNOTSUPP; 2106} 2107EXPORT_SYMBOL(sock_no_listen); 2108 2109int sock_no_shutdown(struct socket *sock, int how) 2110{ 2111 return -EOPNOTSUPP; 2112} 2113EXPORT_SYMBOL(sock_no_shutdown); 2114 2115int sock_no_setsockopt(struct socket *sock, int level, int optname, 2116 char __user *optval, unsigned int optlen) 2117{ 2118 return -EOPNOTSUPP; 2119} 2120EXPORT_SYMBOL(sock_no_setsockopt); 2121 2122int sock_no_getsockopt(struct socket *sock, int level, int optname, 2123 char __user *optval, int __user *optlen) 2124{ 2125 return -EOPNOTSUPP; 2126} 2127EXPORT_SYMBOL(sock_no_getsockopt); 2128 2129int sock_no_sendmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *m, 2130 size_t len) 2131{ 2132 return -EOPNOTSUPP; 2133} 2134EXPORT_SYMBOL(sock_no_sendmsg); 2135 2136int sock_no_recvmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *m, 2137 size_t len, int flags) 2138{ 2139 return -EOPNOTSUPP; 2140} 2141EXPORT_SYMBOL(sock_no_recvmsg); 2142 2143int sock_no_mmap(struct file *file, struct socket *sock, struct vm_area_struct *vma) 2144{ 2145 /* Mirror missing mmap method error code */ 2146 return -ENODEV; 2147} 2148EXPORT_SYMBOL(sock_no_mmap); 2149 2150ssize_t sock_no_sendpage(struct socket *sock, struct page *page, int offset, size_t size, int flags) 2151{ 2152 ssize_t res; 2153 struct msghdr msg = {.msg_flags = flags}; 2154 struct kvec iov; 2155 char *kaddr = kmap(page); 2156 iov.iov_base = kaddr + offset; 2157 iov.iov_len = size; 2158 res = kernel_sendmsg(sock, &msg, &iov, 1, size); 2159 kunmap(page); 2160 return res; 2161} 2162EXPORT_SYMBOL(sock_no_sendpage); 2163 2164/* 2165 * Default Socket Callbacks 2166 */ 2167 2168static void sock_def_wakeup(struct sock *sk) 2169{ 2170 struct socket_wq *wq; 2171 2172 rcu_read_lock(); 2173 wq = rcu_dereference(sk->sk_wq); 2174 if (wq_has_sleeper(wq)) 2175 wake_up_interruptible_all(&wq->wait); 2176 rcu_read_unlock(); 2177} 2178 2179static void sock_def_error_report(struct sock *sk) 2180{ 2181 struct socket_wq *wq; 2182 2183 rcu_read_lock(); 2184 wq = rcu_dereference(sk->sk_wq); 2185 if (wq_has_sleeper(wq)) 2186 wake_up_interruptible_poll(&wq->wait, POLLERR); 2187 sk_wake_async(sk, SOCK_WAKE_IO, POLL_ERR); 2188 rcu_read_unlock(); 2189} 2190 2191static void sock_def_readable(struct sock *sk, int len) 2192{ 2193 struct socket_wq *wq; 2194 2195 rcu_read_lock(); 2196 wq = rcu_dereference(sk->sk_wq); 2197 if (wq_has_sleeper(wq)) 2198 wake_up_interruptible_sync_poll(&wq->wait, POLLIN | POLLPRI | 2199 POLLRDNORM | POLLRDBAND); 2200 sk_wake_async(sk, SOCK_WAKE_WAITD, POLL_IN); 2201 rcu_read_unlock(); 2202} 2203 2204static void sock_def_write_space(struct sock *sk) 2205{ 2206 struct socket_wq *wq; 2207 2208 rcu_read_lock(); 2209 2210 /* Do not wake up a writer until he can make "significant" 2211 * progress. --DaveM 2212 */ 2213 if ((atomic_read(&sk->sk_wmem_alloc) << 1) <= sk->sk_sndbuf) { 2214 wq = rcu_dereference(sk->sk_wq); 2215 if (wq_has_sleeper(wq)) 2216 wake_up_interruptible_sync_poll(&wq->wait, POLLOUT | 2217 POLLWRNORM | POLLWRBAND); 2218 2219 /* Should agree with poll, otherwise some programs break */ 2220 if (sock_writeable(sk)) 2221 sk_wake_async(sk, SOCK_WAKE_SPACE, POLL_OUT); 2222 } 2223 2224 rcu_read_unlock(); 2225} 2226 2227static void sock_def_destruct(struct sock *sk) 2228{ 2229 kfree(sk->sk_protinfo); 2230} 2231 2232void sk_send_sigurg(struct sock *sk) 2233{ 2234 if (sk->sk_socket && sk->sk_socket->file) 2235 if (send_sigurg(&sk->sk_socket->file->f_owner)) 2236 sk_wake_async(sk, SOCK_WAKE_URG, POLL_PRI); 2237} 2238EXPORT_SYMBOL(sk_send_sigurg); 2239 2240void sk_reset_timer(struct sock *sk, struct timer_list* timer, 2241 unsigned long expires) 2242{ 2243 if (!mod_timer(timer, expires)) 2244 sock_hold(sk); 2245} 2246EXPORT_SYMBOL(sk_reset_timer); 2247 2248void sk_stop_timer(struct sock *sk, struct timer_list* timer) 2249{ 2250 if (del_timer(timer)) 2251 __sock_put(sk); 2252} 2253EXPORT_SYMBOL(sk_stop_timer); 2254 2255void sock_init_data(struct socket *sock, struct sock *sk) 2256{ 2257 skb_queue_head_init(&sk->sk_receive_queue); 2258 skb_queue_head_init(&sk->sk_write_queue); 2259 skb_queue_head_init(&sk->sk_error_queue); 2260#ifdef CONFIG_NET_DMA 2261 skb_queue_head_init(&sk->sk_async_wait_queue); 2262#endif 2263 2264 sk->sk_send_head = NULL; 2265 2266 init_timer(&sk->sk_timer); 2267 2268 sk->sk_allocation = GFP_KERNEL; 2269 sk->sk_rcvbuf = sysctl_rmem_default; 2270 sk->sk_sndbuf = sysctl_wmem_default; 2271 sk->sk_state = TCP_CLOSE; 2272 sk_set_socket(sk, sock); 2273 2274 sock_set_flag(sk, SOCK_ZAPPED); 2275 2276 if (sock) { 2277 sk->sk_type = sock->type; 2278 sk->sk_wq = sock->wq; 2279 sock->sk = sk; 2280 } else 2281 sk->sk_wq = NULL; 2282 2283 spin_lock_init(&sk->sk_dst_lock); 2284 rwlock_init(&sk->sk_callback_lock); 2285 lockdep_set_class_and_name(&sk->sk_callback_lock, 2286 af_callback_keys + sk->sk_family, 2287 af_family_clock_key_strings[sk->sk_family]); 2288 2289 sk->sk_state_change = sock_def_wakeup; 2290 sk->sk_data_ready = sock_def_readable; 2291 sk->sk_write_space = sock_def_write_space; 2292 sk->sk_error_report = sock_def_error_report; 2293 sk->sk_destruct = sock_def_destruct; 2294 2295 sk->sk_frag.page = NULL; 2296 sk->sk_frag.offset = 0; 2297 sk->sk_peek_off = -1; 2298 2299 sk->sk_peer_pid = NULL; 2300 sk->sk_peer_cred = NULL; 2301 sk->sk_write_pending = 0; 2302 sk->sk_rcvlowat = 1; 2303 sk->sk_rcvtimeo = MAX_SCHEDULE_TIMEOUT; 2304 sk->sk_sndtimeo = MAX_SCHEDULE_TIMEOUT; 2305 2306 sk->sk_stamp = ktime_set(-1L, 0); 2307 2308#ifdef CONFIG_NET_LL_RX_POLL 2309 sk->sk_napi_id = 0; 2310 sk->sk_ll_usec = sysctl_net_ll_read; 2311#endif 2312 2313 /* 2314 * Before updating sk_refcnt, we must commit prior changes to memory 2315 * (Documentation/RCU/rculist_nulls.txt for details) 2316 */ 2317 smp_wmb(); 2318 atomic_set(&sk->sk_refcnt, 1); 2319 atomic_set(&sk->sk_drops, 0); 2320} 2321EXPORT_SYMBOL(sock_init_data); 2322 2323void lock_sock_nested(struct sock *sk, int subclass) 2324{ 2325 might_sleep(); 2326 spin_lock_bh(&sk->sk_lock.slock); 2327 if (sk->sk_lock.owned) 2328 __lock_sock(sk); 2329 sk->sk_lock.owned = 1; 2330 spin_unlock(&sk->sk_lock.slock); 2331 /* 2332 * The sk_lock has mutex_lock() semantics here: 2333 */ 2334 mutex_acquire(&sk->sk_lock.dep_map, subclass, 0, _RET_IP_); 2335 local_bh_enable(); 2336} 2337EXPORT_SYMBOL(lock_sock_nested); 2338 2339void release_sock(struct sock *sk) 2340{ 2341 /* 2342 * The sk_lock has mutex_unlock() semantics: 2343 */ 2344 mutex_release(&sk->sk_lock.dep_map, 1, _RET_IP_); 2345 2346 spin_lock_bh(&sk->sk_lock.slock); 2347 if (sk->sk_backlog.tail) 2348 __release_sock(sk); 2349 2350 if (sk->sk_prot->release_cb) 2351 sk->sk_prot->release_cb(sk); 2352 2353 sk->sk_lock.owned = 0; 2354 if (waitqueue_active(&sk->sk_lock.wq)) 2355 wake_up(&sk->sk_lock.wq); 2356 spin_unlock_bh(&sk->sk_lock.slock); 2357} 2358EXPORT_SYMBOL(release_sock); 2359 2360/** 2361 * lock_sock_fast - fast version of lock_sock 2362 * @sk: socket 2363 * 2364 * This version should be used for very small section, where process wont block 2365 * return false if fast path is taken 2366 * sk_lock.slock locked, owned = 0, BH disabled 2367 * return true if slow path is taken 2368 * sk_lock.slock unlocked, owned = 1, BH enabled 2369 */ 2370bool lock_sock_fast(struct sock *sk) 2371{ 2372 might_sleep(); 2373 spin_lock_bh(&sk->sk_lock.slock); 2374 2375 if (!sk->sk_lock.owned) 2376 /* 2377 * Note : We must disable BH 2378 */ 2379 return false; 2380 2381 __lock_sock(sk); 2382 sk->sk_lock.owned = 1; 2383 spin_unlock(&sk->sk_lock.slock); 2384 /* 2385 * The sk_lock has mutex_lock() semantics here: 2386 */ 2387 mutex_acquire(&sk->sk_lock.dep_map, 0, 0, _RET_IP_); 2388 local_bh_enable(); 2389 return true; 2390} 2391EXPORT_SYMBOL(lock_sock_fast); 2392 2393int sock_get_timestamp(struct sock *sk, struct timeval __user *userstamp) 2394{ 2395 struct timeval tv; 2396 if (!sock_flag(sk, SOCK_TIMESTAMP)) 2397 sock_enable_timestamp(sk, SOCK_TIMESTAMP); 2398 tv = ktime_to_timeval(sk->sk_stamp); 2399 if (tv.tv_sec == -1) 2400 return -ENOENT; 2401 if (tv.tv_sec == 0) { 2402 sk->sk_stamp = ktime_get_real(); 2403 tv = ktime_to_timeval(sk->sk_stamp); 2404 } 2405 return copy_to_user(userstamp, &tv, sizeof(tv)) ? -EFAULT : 0; 2406} 2407EXPORT_SYMBOL(sock_get_timestamp); 2408 2409int sock_get_timestampns(struct sock *sk, struct timespec __user *userstamp) 2410{ 2411 struct timespec ts; 2412 if (!sock_flag(sk, SOCK_TIMESTAMP)) 2413 sock_enable_timestamp(sk, SOCK_TIMESTAMP); 2414 ts = ktime_to_timespec(sk->sk_stamp); 2415 if (ts.tv_sec == -1) 2416 return -ENOENT; 2417 if (ts.tv_sec == 0) { 2418 sk->sk_stamp = ktime_get_real(); 2419 ts = ktime_to_timespec(sk->sk_stamp); 2420 } 2421 return copy_to_user(userstamp, &ts, sizeof(ts)) ? -EFAULT : 0; 2422} 2423EXPORT_SYMBOL(sock_get_timestampns); 2424 2425void sock_enable_timestamp(struct sock *sk, int flag) 2426{ 2427 if (!sock_flag(sk, flag)) { 2428 unsigned long previous_flags = sk->sk_flags; 2429 2430 sock_set_flag(sk, flag); 2431 /* 2432 * we just set one of the two flags which require net 2433 * time stamping, but time stamping might have been on 2434 * already because of the other one 2435 */ 2436 if (!(previous_flags & SK_FLAGS_TIMESTAMP)) 2437 net_enable_timestamp(); 2438 } 2439} 2440 2441/* 2442 * Get a socket option on an socket. 2443 * 2444 * FIX: POSIX 1003.1g is very ambiguous here. It states that 2445 * asynchronous errors should be reported by getsockopt. We assume 2446 * this means if you specify SO_ERROR (otherwise whats the point of it). 2447 */ 2448int sock_common_getsockopt(struct socket *sock, int level, int optname, 2449 char __user *optval, int __user *optlen) 2450{ 2451 struct sock *sk = sock->sk; 2452 2453 return sk->sk_prot->getsockopt(sk, level, optname, optval, optlen); 2454} 2455EXPORT_SYMBOL(sock_common_getsockopt); 2456 2457#ifdef CONFIG_COMPAT 2458int compat_sock_common_getsockopt(struct socket *sock, int level, int optname, 2459 char __user *optval, int __user *optlen) 2460{ 2461 struct sock *sk = sock->sk; 2462 2463 if (sk->sk_prot->compat_getsockopt != NULL) 2464 return sk->sk_prot->compat_getsockopt(sk, level, optname, 2465 optval, optlen); 2466 return sk->sk_prot->getsockopt(sk, level, optname, optval, optlen); 2467} 2468EXPORT_SYMBOL(compat_sock_common_getsockopt); 2469#endif 2470 2471int sock_common_recvmsg(struct kiocb *iocb, struct socket *sock, 2472 struct msghdr *msg, size_t size, int flags) 2473{ 2474 struct sock *sk = sock->sk; 2475 int addr_len = 0; 2476 int err; 2477 2478 err = sk->sk_prot->recvmsg(iocb, sk, msg, size, flags & MSG_DONTWAIT, 2479 flags & ~MSG_DONTWAIT, &addr_len); 2480 if (err >= 0) 2481 msg->msg_namelen = addr_len; 2482 return err; 2483} 2484EXPORT_SYMBOL(sock_common_recvmsg); 2485 2486/* 2487 * Set socket options on an inet socket. 2488 */ 2489int sock_common_setsockopt(struct socket *sock, int level, int optname, 2490 char __user *optval, unsigned int optlen) 2491{ 2492 struct sock *sk = sock->sk; 2493 2494 return sk->sk_prot->setsockopt(sk, level, optname, optval, optlen); 2495} 2496EXPORT_SYMBOL(sock_common_setsockopt); 2497 2498#ifdef CONFIG_COMPAT 2499int compat_sock_common_setsockopt(struct socket *sock, int level, int optname, 2500 char __user *optval, unsigned int optlen) 2501{ 2502 struct sock *sk = sock->sk; 2503 2504 if (sk->sk_prot->compat_setsockopt != NULL) 2505 return sk->sk_prot->compat_setsockopt(sk, level, optname, 2506 optval, optlen); 2507 return sk->sk_prot->setsockopt(sk, level, optname, optval, optlen); 2508} 2509EXPORT_SYMBOL(compat_sock_common_setsockopt); 2510#endif 2511 2512void sk_common_release(struct sock *sk) 2513{ 2514 if (sk->sk_prot->destroy) 2515 sk->sk_prot->destroy(sk); 2516 2517 /* 2518 * Observation: when sock_common_release is called, processes have 2519 * no access to socket. But net still has. 2520 * Step one, detach it from networking: 2521 * 2522 * A. Remove from hash tables. 2523 */ 2524 2525 sk->sk_prot->unhash(sk); 2526 2527 /* 2528 * In this point socket cannot receive new packets, but it is possible 2529 * that some packets are in flight because some CPU runs receiver and 2530 * did hash table lookup before we unhashed socket. They will achieve 2531 * receive queue and will be purged by socket destructor. 2532 * 2533 * Also we still have packets pending on receive queue and probably, 2534 * our own packets waiting in device queues. sock_destroy will drain 2535 * receive queue, but transmitted packets will delay socket destruction 2536 * until the last reference will be released. 2537 */ 2538 2539 sock_orphan(sk); 2540 2541 xfrm_sk_free_policy(sk); 2542 2543 sk_refcnt_debug_release(sk); 2544 2545 if (sk->sk_frag.page) { 2546 put_page(sk->sk_frag.page); 2547 sk->sk_frag.page = NULL; 2548 } 2549 2550 sock_put(sk); 2551} 2552EXPORT_SYMBOL(sk_common_release); 2553 2554#ifdef CONFIG_PROC_FS 2555#define PROTO_INUSE_NR 64 /* should be enough for the first time */ 2556struct prot_inuse { 2557 int val[PROTO_INUSE_NR]; 2558}; 2559 2560static DECLARE_BITMAP(proto_inuse_idx, PROTO_INUSE_NR); 2561 2562#ifdef CONFIG_NET_NS 2563void sock_prot_inuse_add(struct net *net, struct proto *prot, int val) 2564{ 2565 __this_cpu_add(net->core.inuse->val[prot->inuse_idx], val); 2566} 2567EXPORT_SYMBOL_GPL(sock_prot_inuse_add); 2568 2569int sock_prot_inuse_get(struct net *net, struct proto *prot) 2570{ 2571 int cpu, idx = prot->inuse_idx; 2572 int res = 0; 2573 2574 for_each_possible_cpu(cpu) 2575 res += per_cpu_ptr(net->core.inuse, cpu)->val[idx]; 2576 2577 return res >= 0 ? res : 0; 2578} 2579EXPORT_SYMBOL_GPL(sock_prot_inuse_get); 2580 2581static int __net_init sock_inuse_init_net(struct net *net) 2582{ 2583 net->core.inuse = alloc_percpu(struct prot_inuse); 2584 return net->core.inuse ? 0 : -ENOMEM; 2585} 2586 2587static void __net_exit sock_inuse_exit_net(struct net *net) 2588{ 2589 free_percpu(net->core.inuse); 2590} 2591 2592static struct pernet_operations net_inuse_ops = { 2593 .init = sock_inuse_init_net, 2594 .exit = sock_inuse_exit_net, 2595}; 2596 2597static __init int net_inuse_init(void) 2598{ 2599 if (register_pernet_subsys(&net_inuse_ops)) 2600 panic("Cannot initialize net inuse counters"); 2601 2602 return 0; 2603} 2604 2605core_initcall(net_inuse_init); 2606#else 2607static DEFINE_PER_CPU(struct prot_inuse, prot_inuse); 2608 2609void sock_prot_inuse_add(struct net *net, struct proto *prot, int val) 2610{ 2611 __this_cpu_add(prot_inuse.val[prot->inuse_idx], val); 2612} 2613EXPORT_SYMBOL_GPL(sock_prot_inuse_add); 2614 2615int sock_prot_inuse_get(struct net *net, struct proto *prot) 2616{ 2617 int cpu, idx = prot->inuse_idx; 2618 int res = 0; 2619 2620 for_each_possible_cpu(cpu) 2621 res += per_cpu(prot_inuse, cpu).val[idx]; 2622 2623 return res >= 0 ? res : 0; 2624} 2625EXPORT_SYMBOL_GPL(sock_prot_inuse_get); 2626#endif 2627 2628static void assign_proto_idx(struct proto *prot) 2629{ 2630 prot->inuse_idx = find_first_zero_bit(proto_inuse_idx, PROTO_INUSE_NR); 2631 2632 if (unlikely(prot->inuse_idx == PROTO_INUSE_NR - 1)) { 2633 pr_err("PROTO_INUSE_NR exhausted\n"); 2634 return; 2635 } 2636 2637 set_bit(prot->inuse_idx, proto_inuse_idx); 2638} 2639 2640static void release_proto_idx(struct proto *prot) 2641{ 2642 if (prot->inuse_idx != PROTO_INUSE_NR - 1) 2643 clear_bit(prot->inuse_idx, proto_inuse_idx); 2644} 2645#else 2646static inline void assign_proto_idx(struct proto *prot) 2647{ 2648} 2649 2650static inline void release_proto_idx(struct proto *prot) 2651{ 2652} 2653#endif 2654 2655int proto_register(struct proto *prot, int alloc_slab) 2656{ 2657 if (alloc_slab) { 2658 prot->slab = kmem_cache_create(prot->name, prot->obj_size, 0, 2659 SLAB_HWCACHE_ALIGN | prot->slab_flags, 2660 NULL); 2661 2662 if (prot->slab == NULL) { 2663 pr_crit("%s: Can't create sock SLAB cache!\n", 2664 prot->name); 2665 goto out; 2666 } 2667 2668 if (prot->rsk_prot != NULL) { 2669 prot->rsk_prot->slab_name = kasprintf(GFP_KERNEL, "request_sock_%s", prot->name); 2670 if (prot->rsk_prot->slab_name == NULL) 2671 goto out_free_sock_slab; 2672 2673 prot->rsk_prot->slab = kmem_cache_create(prot->rsk_prot->slab_name, 2674 prot->rsk_prot->obj_size, 0, 2675 SLAB_HWCACHE_ALIGN, NULL); 2676 2677 if (prot->rsk_prot->slab == NULL) { 2678 pr_crit("%s: Can't create request sock SLAB cache!\n", 2679 prot->name); 2680 goto out_free_request_sock_slab_name; 2681 } 2682 } 2683 2684 if (prot->twsk_prot != NULL) { 2685 prot->twsk_prot->twsk_slab_name = kasprintf(GFP_KERNEL, "tw_sock_%s", prot->name); 2686 2687 if (prot->twsk_prot->twsk_slab_name == NULL) 2688 goto out_free_request_sock_slab; 2689 2690 prot->twsk_prot->twsk_slab = 2691 kmem_cache_create(prot->twsk_prot->twsk_slab_name, 2692 prot->twsk_prot->twsk_obj_size, 2693 0, 2694 SLAB_HWCACHE_ALIGN | 2695 prot->slab_flags, 2696 NULL); 2697 if (prot->twsk_prot->twsk_slab == NULL) 2698 goto out_free_timewait_sock_slab_name; 2699 } 2700 } 2701 2702 mutex_lock(&proto_list_mutex); 2703 list_add(&prot->node, &proto_list); 2704 assign_proto_idx(prot); 2705 mutex_unlock(&proto_list_mutex); 2706 return 0; 2707 2708out_free_timewait_sock_slab_name: 2709 kfree(prot->twsk_prot->twsk_slab_name); 2710out_free_request_sock_slab: 2711 if (prot->rsk_prot && prot->rsk_prot->slab) { 2712 kmem_cache_destroy(prot->rsk_prot->slab); 2713 prot->rsk_prot->slab = NULL; 2714 } 2715out_free_request_sock_slab_name: 2716 if (prot->rsk_prot) 2717 kfree(prot->rsk_prot->slab_name); 2718out_free_sock_slab: 2719 kmem_cache_destroy(prot->slab); 2720 prot->slab = NULL; 2721out: 2722 return -ENOBUFS; 2723} 2724EXPORT_SYMBOL(proto_register); 2725 2726void proto_unregister(struct proto *prot) 2727{ 2728 mutex_lock(&proto_list_mutex); 2729 release_proto_idx(prot); 2730 list_del(&prot->node); 2731 mutex_unlock(&proto_list_mutex); 2732 2733 if (prot->slab != NULL) { 2734 kmem_cache_destroy(prot->slab); 2735 prot->slab = NULL; 2736 } 2737 2738 if (prot->rsk_prot != NULL && prot->rsk_prot->slab != NULL) { 2739 kmem_cache_destroy(prot->rsk_prot->slab); 2740 kfree(prot->rsk_prot->slab_name); 2741 prot->rsk_prot->slab = NULL; 2742 } 2743 2744 if (prot->twsk_prot != NULL && prot->twsk_prot->twsk_slab != NULL) { 2745 kmem_cache_destroy(prot->twsk_prot->twsk_slab); 2746 kfree(prot->twsk_prot->twsk_slab_name); 2747 prot->twsk_prot->twsk_slab = NULL; 2748 } 2749} 2750EXPORT_SYMBOL(proto_unregister); 2751 2752#ifdef CONFIG_PROC_FS 2753static void *proto_seq_start(struct seq_file *seq, loff_t *pos) 2754 __acquires(proto_list_mutex) 2755{ 2756 mutex_lock(&proto_list_mutex); 2757 return seq_list_start_head(&proto_list, *pos); 2758} 2759 2760static void *proto_seq_next(struct seq_file *seq, void *v, loff_t *pos) 2761{ 2762 return seq_list_next(v, &proto_list, pos); 2763} 2764 2765static void proto_seq_stop(struct seq_file *seq, void *v) 2766 __releases(proto_list_mutex) 2767{ 2768 mutex_unlock(&proto_list_mutex); 2769} 2770 2771static char proto_method_implemented(const void *method) 2772{ 2773 return method == NULL ? 'n' : 'y'; 2774} 2775static long sock_prot_memory_allocated(struct proto *proto) 2776{ 2777 return proto->memory_allocated != NULL ? proto_memory_allocated(proto) : -1L; 2778} 2779 2780static char *sock_prot_memory_pressure(struct proto *proto) 2781{ 2782 return proto->memory_pressure != NULL ? 2783 proto_memory_pressure(proto) ? "yes" : "no" : "NI"; 2784} 2785 2786static void proto_seq_printf(struct seq_file *seq, struct proto *proto) 2787{ 2788 2789 seq_printf(seq, "%-9s %4u %6d %6ld %-3s %6u %-3s %-10s " 2790 "%2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c\n", 2791 proto->name, 2792 proto->obj_size, 2793 sock_prot_inuse_get(seq_file_net(seq), proto), 2794 sock_prot_memory_allocated(proto), 2795 sock_prot_memory_pressure(proto), 2796 proto->max_header, 2797 proto->slab == NULL ? "no" : "yes", 2798 module_name(proto->owner), 2799 proto_method_implemented(proto->close), 2800 proto_method_implemented(proto->connect), 2801 proto_method_implemented(proto->disconnect), 2802 proto_method_implemented(proto->accept), 2803 proto_method_implemented(proto->ioctl), 2804 proto_method_implemented(proto->init), 2805 proto_method_implemented(proto->destroy), 2806 proto_method_implemented(proto->shutdown), 2807 proto_method_implemented(proto->setsockopt), 2808 proto_method_implemented(proto->getsockopt), 2809 proto_method_implemented(proto->sendmsg), 2810 proto_method_implemented(proto->recvmsg), 2811 proto_method_implemented(proto->sendpage), 2812 proto_method_implemented(proto->bind), 2813 proto_method_implemented(proto->backlog_rcv), 2814 proto_method_implemented(proto->hash), 2815 proto_method_implemented(proto->unhash), 2816 proto_method_implemented(proto->get_port), 2817 proto_method_implemented(proto->enter_memory_pressure)); 2818} 2819 2820static int proto_seq_show(struct seq_file *seq, void *v) 2821{ 2822 if (v == &proto_list) 2823 seq_printf(seq, "%-9s %-4s %-8s %-6s %-5s %-7s %-4s %-10s %s", 2824 "protocol", 2825 "size", 2826 "sockets", 2827 "memory", 2828 "press", 2829 "maxhdr", 2830 "slab", 2831 "module", 2832 "cl co di ac io in de sh ss gs se re sp bi br ha uh gp em\n"); 2833 else 2834 proto_seq_printf(seq, list_entry(v, struct proto, node)); 2835 return 0; 2836} 2837 2838static const struct seq_operations proto_seq_ops = { 2839 .start = proto_seq_start, 2840 .next = proto_seq_next, 2841 .stop = proto_seq_stop, 2842 .show = proto_seq_show, 2843}; 2844 2845static int proto_seq_open(struct inode *inode, struct file *file) 2846{ 2847 return seq_open_net(inode, file, &proto_seq_ops, 2848 sizeof(struct seq_net_private)); 2849} 2850 2851static const struct file_operations proto_seq_fops = { 2852 .owner = THIS_MODULE, 2853 .open = proto_seq_open, 2854 .read = seq_read, 2855 .llseek = seq_lseek, 2856 .release = seq_release_net, 2857}; 2858 2859static __net_init int proto_init_net(struct net *net) 2860{ 2861 if (!proc_create("protocols", S_IRUGO, net->proc_net, &proto_seq_fops)) 2862 return -ENOMEM; 2863 2864 return 0; 2865} 2866 2867static __net_exit void proto_exit_net(struct net *net) 2868{ 2869 remove_proc_entry("protocols", net->proc_net); 2870} 2871 2872 2873static __net_initdata struct pernet_operations proto_net_ops = { 2874 .init = proto_init_net, 2875 .exit = proto_exit_net, 2876}; 2877 2878static int __init proto_init(void) 2879{ 2880 return register_pernet_subsys(&proto_net_ops); 2881} 2882 2883subsys_initcall(proto_init); 2884 2885#endif /* PROC_FS */ 2886