sock.c revision 20d4947353be60e909e6b1a79d241457edd6833f
1/* 2 * INET An implementation of the TCP/IP protocol suite for the LINUX 3 * operating system. INET is implemented using the BSD Socket 4 * interface as the means of communication with the user level. 5 * 6 * Generic socket support routines. Memory allocators, socket lock/release 7 * handler for protocols to use and generic option handler. 8 * 9 * 10 * Authors: Ross Biro 11 * Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG> 12 * Florian La Roche, <flla@stud.uni-sb.de> 13 * Alan Cox, <A.Cox@swansea.ac.uk> 14 * 15 * Fixes: 16 * Alan Cox : Numerous verify_area() problems 17 * Alan Cox : Connecting on a connecting socket 18 * now returns an error for tcp. 19 * Alan Cox : sock->protocol is set correctly. 20 * and is not sometimes left as 0. 21 * Alan Cox : connect handles icmp errors on a 22 * connect properly. Unfortunately there 23 * is a restart syscall nasty there. I 24 * can't match BSD without hacking the C 25 * library. Ideas urgently sought! 26 * Alan Cox : Disallow bind() to addresses that are 27 * not ours - especially broadcast ones!! 28 * Alan Cox : Socket 1024 _IS_ ok for users. (fencepost) 29 * Alan Cox : sock_wfree/sock_rfree don't destroy sockets, 30 * instead they leave that for the DESTROY timer. 31 * Alan Cox : Clean up error flag in accept 32 * Alan Cox : TCP ack handling is buggy, the DESTROY timer 33 * was buggy. Put a remove_sock() in the handler 34 * for memory when we hit 0. Also altered the timer 35 * code. The ACK stuff can wait and needs major 36 * TCP layer surgery. 37 * Alan Cox : Fixed TCP ack bug, removed remove sock 38 * and fixed timer/inet_bh race. 39 * Alan Cox : Added zapped flag for TCP 40 * Alan Cox : Move kfree_skb into skbuff.c and tidied up surplus code 41 * Alan Cox : for new sk_buff allocations wmalloc/rmalloc now call alloc_skb 42 * Alan Cox : kfree_s calls now are kfree_skbmem so we can track skb resources 43 * Alan Cox : Supports socket option broadcast now as does udp. Packet and raw need fixing. 44 * Alan Cox : Added RCVBUF,SNDBUF size setting. It suddenly occurred to me how easy it was so... 45 * Rick Sladkey : Relaxed UDP rules for matching packets. 46 * C.E.Hawkins : IFF_PROMISC/SIOCGHWADDR support 47 * Pauline Middelink : identd support 48 * Alan Cox : Fixed connect() taking signals I think. 49 * Alan Cox : SO_LINGER supported 50 * Alan Cox : Error reporting fixes 51 * Anonymous : inet_create tidied up (sk->reuse setting) 52 * Alan Cox : inet sockets don't set sk->type! 53 * Alan Cox : Split socket option code 54 * Alan Cox : Callbacks 55 * Alan Cox : Nagle flag for Charles & Johannes stuff 56 * Alex : Removed restriction on inet fioctl 57 * Alan Cox : Splitting INET from NET core 58 * Alan Cox : Fixed bogus SO_TYPE handling in getsockopt() 59 * Adam Caldwell : Missing return in SO_DONTROUTE/SO_DEBUG code 60 * Alan Cox : Split IP from generic code 61 * Alan Cox : New kfree_skbmem() 62 * Alan Cox : Make SO_DEBUG superuser only. 63 * Alan Cox : Allow anyone to clear SO_DEBUG 64 * (compatibility fix) 65 * Alan Cox : Added optimistic memory grabbing for AF_UNIX throughput. 66 * Alan Cox : Allocator for a socket is settable. 67 * Alan Cox : SO_ERROR includes soft errors. 68 * Alan Cox : Allow NULL arguments on some SO_ opts 69 * Alan Cox : Generic socket allocation to make hooks 70 * easier (suggested by Craig Metz). 71 * Michael Pall : SO_ERROR returns positive errno again 72 * Steve Whitehouse: Added default destructor to free 73 * protocol private data. 74 * Steve Whitehouse: Added various other default routines 75 * common to several socket families. 76 * Chris Evans : Call suser() check last on F_SETOWN 77 * Jay Schulist : Added SO_ATTACH_FILTER and SO_DETACH_FILTER. 78 * Andi Kleen : Add sock_kmalloc()/sock_kfree_s() 79 * Andi Kleen : Fix write_space callback 80 * Chris Evans : Security fixes - signedness again 81 * Arnaldo C. Melo : cleanups, use skb_queue_purge 82 * 83 * To Fix: 84 * 85 * 86 * This program is free software; you can redistribute it and/or 87 * modify it under the terms of the GNU General Public License 88 * as published by the Free Software Foundation; either version 89 * 2 of the License, or (at your option) any later version. 90 */ 91 92#include <linux/capability.h> 93#include <linux/errno.h> 94#include <linux/types.h> 95#include <linux/socket.h> 96#include <linux/in.h> 97#include <linux/kernel.h> 98#include <linux/module.h> 99#include <linux/proc_fs.h> 100#include <linux/seq_file.h> 101#include <linux/sched.h> 102#include <linux/timer.h> 103#include <linux/string.h> 104#include <linux/sockios.h> 105#include <linux/net.h> 106#include <linux/mm.h> 107#include <linux/slab.h> 108#include <linux/interrupt.h> 109#include <linux/poll.h> 110#include <linux/tcp.h> 111#include <linux/init.h> 112#include <linux/highmem.h> 113 114#include <asm/uaccess.h> 115#include <asm/system.h> 116 117#include <linux/netdevice.h> 118#include <net/protocol.h> 119#include <linux/skbuff.h> 120#include <net/net_namespace.h> 121#include <net/request_sock.h> 122#include <net/sock.h> 123#include <linux/net_tstamp.h> 124#include <net/xfrm.h> 125#include <linux/ipsec.h> 126 127#include <linux/filter.h> 128 129#ifdef CONFIG_INET 130#include <net/tcp.h> 131#endif 132 133/* 134 * Each address family might have different locking rules, so we have 135 * one slock key per address family: 136 */ 137static struct lock_class_key af_family_keys[AF_MAX]; 138static struct lock_class_key af_family_slock_keys[AF_MAX]; 139 140/* 141 * Make lock validator output more readable. (we pre-construct these 142 * strings build-time, so that runtime initialization of socket 143 * locks is fast): 144 */ 145static const char *af_family_key_strings[AF_MAX+1] = { 146 "sk_lock-AF_UNSPEC", "sk_lock-AF_UNIX" , "sk_lock-AF_INET" , 147 "sk_lock-AF_AX25" , "sk_lock-AF_IPX" , "sk_lock-AF_APPLETALK", 148 "sk_lock-AF_NETROM", "sk_lock-AF_BRIDGE" , "sk_lock-AF_ATMPVC" , 149 "sk_lock-AF_X25" , "sk_lock-AF_INET6" , "sk_lock-AF_ROSE" , 150 "sk_lock-AF_DECnet", "sk_lock-AF_NETBEUI" , "sk_lock-AF_SECURITY" , 151 "sk_lock-AF_KEY" , "sk_lock-AF_NETLINK" , "sk_lock-AF_PACKET" , 152 "sk_lock-AF_ASH" , "sk_lock-AF_ECONET" , "sk_lock-AF_ATMSVC" , 153 "sk_lock-21" , "sk_lock-AF_SNA" , "sk_lock-AF_IRDA" , 154 "sk_lock-AF_PPPOX" , "sk_lock-AF_WANPIPE" , "sk_lock-AF_LLC" , 155 "sk_lock-27" , "sk_lock-28" , "sk_lock-AF_CAN" , 156 "sk_lock-AF_TIPC" , "sk_lock-AF_BLUETOOTH", "sk_lock-IUCV" , 157 "sk_lock-AF_RXRPC" , "sk_lock-AF_ISDN" , "sk_lock-AF_PHONET" , 158 "sk_lock-AF_MAX" 159}; 160static const char *af_family_slock_key_strings[AF_MAX+1] = { 161 "slock-AF_UNSPEC", "slock-AF_UNIX" , "slock-AF_INET" , 162 "slock-AF_AX25" , "slock-AF_IPX" , "slock-AF_APPLETALK", 163 "slock-AF_NETROM", "slock-AF_BRIDGE" , "slock-AF_ATMPVC" , 164 "slock-AF_X25" , "slock-AF_INET6" , "slock-AF_ROSE" , 165 "slock-AF_DECnet", "slock-AF_NETBEUI" , "slock-AF_SECURITY" , 166 "slock-AF_KEY" , "slock-AF_NETLINK" , "slock-AF_PACKET" , 167 "slock-AF_ASH" , "slock-AF_ECONET" , "slock-AF_ATMSVC" , 168 "slock-21" , "slock-AF_SNA" , "slock-AF_IRDA" , 169 "slock-AF_PPPOX" , "slock-AF_WANPIPE" , "slock-AF_LLC" , 170 "slock-27" , "slock-28" , "slock-AF_CAN" , 171 "slock-AF_TIPC" , "slock-AF_BLUETOOTH", "slock-AF_IUCV" , 172 "slock-AF_RXRPC" , "slock-AF_ISDN" , "slock-AF_PHONET" , 173 "slock-AF_MAX" 174}; 175static const char *af_family_clock_key_strings[AF_MAX+1] = { 176 "clock-AF_UNSPEC", "clock-AF_UNIX" , "clock-AF_INET" , 177 "clock-AF_AX25" , "clock-AF_IPX" , "clock-AF_APPLETALK", 178 "clock-AF_NETROM", "clock-AF_BRIDGE" , "clock-AF_ATMPVC" , 179 "clock-AF_X25" , "clock-AF_INET6" , "clock-AF_ROSE" , 180 "clock-AF_DECnet", "clock-AF_NETBEUI" , "clock-AF_SECURITY" , 181 "clock-AF_KEY" , "clock-AF_NETLINK" , "clock-AF_PACKET" , 182 "clock-AF_ASH" , "clock-AF_ECONET" , "clock-AF_ATMSVC" , 183 "clock-21" , "clock-AF_SNA" , "clock-AF_IRDA" , 184 "clock-AF_PPPOX" , "clock-AF_WANPIPE" , "clock-AF_LLC" , 185 "clock-27" , "clock-28" , "clock-AF_CAN" , 186 "clock-AF_TIPC" , "clock-AF_BLUETOOTH", "clock-AF_IUCV" , 187 "clock-AF_RXRPC" , "clock-AF_ISDN" , "clock-AF_PHONET" , 188 "clock-AF_MAX" 189}; 190 191/* 192 * sk_callback_lock locking rules are per-address-family, 193 * so split the lock classes by using a per-AF key: 194 */ 195static struct lock_class_key af_callback_keys[AF_MAX]; 196 197/* Take into consideration the size of the struct sk_buff overhead in the 198 * determination of these values, since that is non-constant across 199 * platforms. This makes socket queueing behavior and performance 200 * not depend upon such differences. 201 */ 202#define _SK_MEM_PACKETS 256 203#define _SK_MEM_OVERHEAD (sizeof(struct sk_buff) + 256) 204#define SK_WMEM_MAX (_SK_MEM_OVERHEAD * _SK_MEM_PACKETS) 205#define SK_RMEM_MAX (_SK_MEM_OVERHEAD * _SK_MEM_PACKETS) 206 207/* Run time adjustable parameters. */ 208__u32 sysctl_wmem_max __read_mostly = SK_WMEM_MAX; 209__u32 sysctl_rmem_max __read_mostly = SK_RMEM_MAX; 210__u32 sysctl_wmem_default __read_mostly = SK_WMEM_MAX; 211__u32 sysctl_rmem_default __read_mostly = SK_RMEM_MAX; 212 213/* Maximal space eaten by iovec or ancilliary data plus some space */ 214int sysctl_optmem_max __read_mostly = sizeof(unsigned long)*(2*UIO_MAXIOV+512); 215 216static int sock_set_timeout(long *timeo_p, char __user *optval, int optlen) 217{ 218 struct timeval tv; 219 220 if (optlen < sizeof(tv)) 221 return -EINVAL; 222 if (copy_from_user(&tv, optval, sizeof(tv))) 223 return -EFAULT; 224 if (tv.tv_usec < 0 || tv.tv_usec >= USEC_PER_SEC) 225 return -EDOM; 226 227 if (tv.tv_sec < 0) { 228 static int warned __read_mostly; 229 230 *timeo_p = 0; 231 if (warned < 10 && net_ratelimit()) { 232 warned++; 233 printk(KERN_INFO "sock_set_timeout: `%s' (pid %d) " 234 "tries to set negative timeout\n", 235 current->comm, task_pid_nr(current)); 236 } 237 return 0; 238 } 239 *timeo_p = MAX_SCHEDULE_TIMEOUT; 240 if (tv.tv_sec == 0 && tv.tv_usec == 0) 241 return 0; 242 if (tv.tv_sec < (MAX_SCHEDULE_TIMEOUT/HZ - 1)) 243 *timeo_p = tv.tv_sec*HZ + (tv.tv_usec+(1000000/HZ-1))/(1000000/HZ); 244 return 0; 245} 246 247static void sock_warn_obsolete_bsdism(const char *name) 248{ 249 static int warned; 250 static char warncomm[TASK_COMM_LEN]; 251 if (strcmp(warncomm, current->comm) && warned < 5) { 252 strcpy(warncomm, current->comm); 253 printk(KERN_WARNING "process `%s' is using obsolete " 254 "%s SO_BSDCOMPAT\n", warncomm, name); 255 warned++; 256 } 257} 258 259static void sock_disable_timestamp(struct sock *sk, int flag) 260{ 261 if (sock_flag(sk, flag)) { 262 sock_reset_flag(sk, flag); 263 if (!sock_flag(sk, SOCK_TIMESTAMP) && 264 !sock_flag(sk, SOCK_TIMESTAMPING_RX_SOFTWARE)) { 265 net_disable_timestamp(); 266 } 267 } 268} 269 270 271int sock_queue_rcv_skb(struct sock *sk, struct sk_buff *skb) 272{ 273 int err = 0; 274 int skb_len; 275 276 /* Cast sk->rcvbuf to unsigned... It's pointless, but reduces 277 number of warnings when compiling with -W --ANK 278 */ 279 if (atomic_read(&sk->sk_rmem_alloc) + skb->truesize >= 280 (unsigned)sk->sk_rcvbuf) { 281 err = -ENOMEM; 282 goto out; 283 } 284 285 err = sk_filter(sk, skb); 286 if (err) 287 goto out; 288 289 if (!sk_rmem_schedule(sk, skb->truesize)) { 290 err = -ENOBUFS; 291 goto out; 292 } 293 294 skb->dev = NULL; 295 skb_set_owner_r(skb, sk); 296 297 /* Cache the SKB length before we tack it onto the receive 298 * queue. Once it is added it no longer belongs to us and 299 * may be freed by other threads of control pulling packets 300 * from the queue. 301 */ 302 skb_len = skb->len; 303 304 skb_queue_tail(&sk->sk_receive_queue, skb); 305 306 if (!sock_flag(sk, SOCK_DEAD)) 307 sk->sk_data_ready(sk, skb_len); 308out: 309 return err; 310} 311EXPORT_SYMBOL(sock_queue_rcv_skb); 312 313int sk_receive_skb(struct sock *sk, struct sk_buff *skb, const int nested) 314{ 315 int rc = NET_RX_SUCCESS; 316 317 if (sk_filter(sk, skb)) 318 goto discard_and_relse; 319 320 skb->dev = NULL; 321 322 if (nested) 323 bh_lock_sock_nested(sk); 324 else 325 bh_lock_sock(sk); 326 if (!sock_owned_by_user(sk)) { 327 /* 328 * trylock + unlock semantics: 329 */ 330 mutex_acquire(&sk->sk_lock.dep_map, 0, 1, _RET_IP_); 331 332 rc = sk_backlog_rcv(sk, skb); 333 334 mutex_release(&sk->sk_lock.dep_map, 1, _RET_IP_); 335 } else 336 sk_add_backlog(sk, skb); 337 bh_unlock_sock(sk); 338out: 339 sock_put(sk); 340 return rc; 341discard_and_relse: 342 kfree_skb(skb); 343 goto out; 344} 345EXPORT_SYMBOL(sk_receive_skb); 346 347struct dst_entry *__sk_dst_check(struct sock *sk, u32 cookie) 348{ 349 struct dst_entry *dst = sk->sk_dst_cache; 350 351 if (dst && dst->obsolete && dst->ops->check(dst, cookie) == NULL) { 352 sk->sk_dst_cache = NULL; 353 dst_release(dst); 354 return NULL; 355 } 356 357 return dst; 358} 359EXPORT_SYMBOL(__sk_dst_check); 360 361struct dst_entry *sk_dst_check(struct sock *sk, u32 cookie) 362{ 363 struct dst_entry *dst = sk_dst_get(sk); 364 365 if (dst && dst->obsolete && dst->ops->check(dst, cookie) == NULL) { 366 sk_dst_reset(sk); 367 dst_release(dst); 368 return NULL; 369 } 370 371 return dst; 372} 373EXPORT_SYMBOL(sk_dst_check); 374 375static int sock_bindtodevice(struct sock *sk, char __user *optval, int optlen) 376{ 377 int ret = -ENOPROTOOPT; 378#ifdef CONFIG_NETDEVICES 379 struct net *net = sock_net(sk); 380 char devname[IFNAMSIZ]; 381 int index; 382 383 /* Sorry... */ 384 ret = -EPERM; 385 if (!capable(CAP_NET_RAW)) 386 goto out; 387 388 ret = -EINVAL; 389 if (optlen < 0) 390 goto out; 391 392 /* Bind this socket to a particular device like "eth0", 393 * as specified in the passed interface name. If the 394 * name is "" or the option length is zero the socket 395 * is not bound. 396 */ 397 if (optlen > IFNAMSIZ - 1) 398 optlen = IFNAMSIZ - 1; 399 memset(devname, 0, sizeof(devname)); 400 401 ret = -EFAULT; 402 if (copy_from_user(devname, optval, optlen)) 403 goto out; 404 405 if (devname[0] == '\0') { 406 index = 0; 407 } else { 408 struct net_device *dev = dev_get_by_name(net, devname); 409 410 ret = -ENODEV; 411 if (!dev) 412 goto out; 413 414 index = dev->ifindex; 415 dev_put(dev); 416 } 417 418 lock_sock(sk); 419 sk->sk_bound_dev_if = index; 420 sk_dst_reset(sk); 421 release_sock(sk); 422 423 ret = 0; 424 425out: 426#endif 427 428 return ret; 429} 430 431static inline void sock_valbool_flag(struct sock *sk, int bit, int valbool) 432{ 433 if (valbool) 434 sock_set_flag(sk, bit); 435 else 436 sock_reset_flag(sk, bit); 437} 438 439/* 440 * This is meant for all protocols to use and covers goings on 441 * at the socket level. Everything here is generic. 442 */ 443 444int sock_setsockopt(struct socket *sock, int level, int optname, 445 char __user *optval, int optlen) 446{ 447 struct sock *sk=sock->sk; 448 int val; 449 int valbool; 450 struct linger ling; 451 int ret = 0; 452 453 /* 454 * Options without arguments 455 */ 456 457 if (optname == SO_BINDTODEVICE) 458 return sock_bindtodevice(sk, optval, optlen); 459 460 if (optlen < sizeof(int)) 461 return -EINVAL; 462 463 if (get_user(val, (int __user *)optval)) 464 return -EFAULT; 465 466 valbool = val?1:0; 467 468 lock_sock(sk); 469 470 switch(optname) { 471 case SO_DEBUG: 472 if (val && !capable(CAP_NET_ADMIN)) { 473 ret = -EACCES; 474 } else 475 sock_valbool_flag(sk, SOCK_DBG, valbool); 476 break; 477 case SO_REUSEADDR: 478 sk->sk_reuse = valbool; 479 break; 480 case SO_TYPE: 481 case SO_ERROR: 482 ret = -ENOPROTOOPT; 483 break; 484 case SO_DONTROUTE: 485 sock_valbool_flag(sk, SOCK_LOCALROUTE, valbool); 486 break; 487 case SO_BROADCAST: 488 sock_valbool_flag(sk, SOCK_BROADCAST, valbool); 489 break; 490 case SO_SNDBUF: 491 /* Don't error on this BSD doesn't and if you think 492 about it this is right. Otherwise apps have to 493 play 'guess the biggest size' games. RCVBUF/SNDBUF 494 are treated in BSD as hints */ 495 496 if (val > sysctl_wmem_max) 497 val = sysctl_wmem_max; 498set_sndbuf: 499 sk->sk_userlocks |= SOCK_SNDBUF_LOCK; 500 if ((val * 2) < SOCK_MIN_SNDBUF) 501 sk->sk_sndbuf = SOCK_MIN_SNDBUF; 502 else 503 sk->sk_sndbuf = val * 2; 504 505 /* 506 * Wake up sending tasks if we 507 * upped the value. 508 */ 509 sk->sk_write_space(sk); 510 break; 511 512 case SO_SNDBUFFORCE: 513 if (!capable(CAP_NET_ADMIN)) { 514 ret = -EPERM; 515 break; 516 } 517 goto set_sndbuf; 518 519 case SO_RCVBUF: 520 /* Don't error on this BSD doesn't and if you think 521 about it this is right. Otherwise apps have to 522 play 'guess the biggest size' games. RCVBUF/SNDBUF 523 are treated in BSD as hints */ 524 525 if (val > sysctl_rmem_max) 526 val = sysctl_rmem_max; 527set_rcvbuf: 528 sk->sk_userlocks |= SOCK_RCVBUF_LOCK; 529 /* 530 * We double it on the way in to account for 531 * "struct sk_buff" etc. overhead. Applications 532 * assume that the SO_RCVBUF setting they make will 533 * allow that much actual data to be received on that 534 * socket. 535 * 536 * Applications are unaware that "struct sk_buff" and 537 * other overheads allocate from the receive buffer 538 * during socket buffer allocation. 539 * 540 * And after considering the possible alternatives, 541 * returning the value we actually used in getsockopt 542 * is the most desirable behavior. 543 */ 544 if ((val * 2) < SOCK_MIN_RCVBUF) 545 sk->sk_rcvbuf = SOCK_MIN_RCVBUF; 546 else 547 sk->sk_rcvbuf = val * 2; 548 break; 549 550 case SO_RCVBUFFORCE: 551 if (!capable(CAP_NET_ADMIN)) { 552 ret = -EPERM; 553 break; 554 } 555 goto set_rcvbuf; 556 557 case SO_KEEPALIVE: 558#ifdef CONFIG_INET 559 if (sk->sk_protocol == IPPROTO_TCP) 560 tcp_set_keepalive(sk, valbool); 561#endif 562 sock_valbool_flag(sk, SOCK_KEEPOPEN, valbool); 563 break; 564 565 case SO_OOBINLINE: 566 sock_valbool_flag(sk, SOCK_URGINLINE, valbool); 567 break; 568 569 case SO_NO_CHECK: 570 sk->sk_no_check = valbool; 571 break; 572 573 case SO_PRIORITY: 574 if ((val >= 0 && val <= 6) || capable(CAP_NET_ADMIN)) 575 sk->sk_priority = val; 576 else 577 ret = -EPERM; 578 break; 579 580 case SO_LINGER: 581 if (optlen < sizeof(ling)) { 582 ret = -EINVAL; /* 1003.1g */ 583 break; 584 } 585 if (copy_from_user(&ling,optval,sizeof(ling))) { 586 ret = -EFAULT; 587 break; 588 } 589 if (!ling.l_onoff) 590 sock_reset_flag(sk, SOCK_LINGER); 591 else { 592#if (BITS_PER_LONG == 32) 593 if ((unsigned int)ling.l_linger >= MAX_SCHEDULE_TIMEOUT/HZ) 594 sk->sk_lingertime = MAX_SCHEDULE_TIMEOUT; 595 else 596#endif 597 sk->sk_lingertime = (unsigned int)ling.l_linger * HZ; 598 sock_set_flag(sk, SOCK_LINGER); 599 } 600 break; 601 602 case SO_BSDCOMPAT: 603 sock_warn_obsolete_bsdism("setsockopt"); 604 break; 605 606 case SO_PASSCRED: 607 if (valbool) 608 set_bit(SOCK_PASSCRED, &sock->flags); 609 else 610 clear_bit(SOCK_PASSCRED, &sock->flags); 611 break; 612 613 case SO_TIMESTAMP: 614 case SO_TIMESTAMPNS: 615 if (valbool) { 616 if (optname == SO_TIMESTAMP) 617 sock_reset_flag(sk, SOCK_RCVTSTAMPNS); 618 else 619 sock_set_flag(sk, SOCK_RCVTSTAMPNS); 620 sock_set_flag(sk, SOCK_RCVTSTAMP); 621 sock_enable_timestamp(sk, SOCK_TIMESTAMP); 622 } else { 623 sock_reset_flag(sk, SOCK_RCVTSTAMP); 624 sock_reset_flag(sk, SOCK_RCVTSTAMPNS); 625 } 626 break; 627 628 case SO_TIMESTAMPING: 629 if (val & ~SOF_TIMESTAMPING_MASK) { 630 ret = EINVAL; 631 break; 632 } 633 sock_valbool_flag(sk, SOCK_TIMESTAMPING_TX_HARDWARE, 634 val & SOF_TIMESTAMPING_TX_HARDWARE); 635 sock_valbool_flag(sk, SOCK_TIMESTAMPING_TX_SOFTWARE, 636 val & SOF_TIMESTAMPING_TX_SOFTWARE); 637 sock_valbool_flag(sk, SOCK_TIMESTAMPING_RX_HARDWARE, 638 val & SOF_TIMESTAMPING_RX_HARDWARE); 639 if (val & SOF_TIMESTAMPING_RX_SOFTWARE) 640 sock_enable_timestamp(sk, 641 SOCK_TIMESTAMPING_RX_SOFTWARE); 642 else 643 sock_disable_timestamp(sk, 644 SOCK_TIMESTAMPING_RX_SOFTWARE); 645 sock_valbool_flag(sk, SOCK_TIMESTAMPING_SOFTWARE, 646 val & SOF_TIMESTAMPING_SOFTWARE); 647 sock_valbool_flag(sk, SOCK_TIMESTAMPING_SYS_HARDWARE, 648 val & SOF_TIMESTAMPING_SYS_HARDWARE); 649 sock_valbool_flag(sk, SOCK_TIMESTAMPING_RAW_HARDWARE, 650 val & SOF_TIMESTAMPING_RAW_HARDWARE); 651 break; 652 653 case SO_RCVLOWAT: 654 if (val < 0) 655 val = INT_MAX; 656 sk->sk_rcvlowat = val ? : 1; 657 break; 658 659 case SO_RCVTIMEO: 660 ret = sock_set_timeout(&sk->sk_rcvtimeo, optval, optlen); 661 break; 662 663 case SO_SNDTIMEO: 664 ret = sock_set_timeout(&sk->sk_sndtimeo, optval, optlen); 665 break; 666 667 case SO_ATTACH_FILTER: 668 ret = -EINVAL; 669 if (optlen == sizeof(struct sock_fprog)) { 670 struct sock_fprog fprog; 671 672 ret = -EFAULT; 673 if (copy_from_user(&fprog, optval, sizeof(fprog))) 674 break; 675 676 ret = sk_attach_filter(&fprog, sk); 677 } 678 break; 679 680 case SO_DETACH_FILTER: 681 ret = sk_detach_filter(sk); 682 break; 683 684 case SO_PASSSEC: 685 if (valbool) 686 set_bit(SOCK_PASSSEC, &sock->flags); 687 else 688 clear_bit(SOCK_PASSSEC, &sock->flags); 689 break; 690 case SO_MARK: 691 if (!capable(CAP_NET_ADMIN)) 692 ret = -EPERM; 693 else { 694 sk->sk_mark = val; 695 } 696 break; 697 698 /* We implement the SO_SNDLOWAT etc to 699 not be settable (1003.1g 5.3) */ 700 default: 701 ret = -ENOPROTOOPT; 702 break; 703 } 704 release_sock(sk); 705 return ret; 706} 707 708 709int sock_getsockopt(struct socket *sock, int level, int optname, 710 char __user *optval, int __user *optlen) 711{ 712 struct sock *sk = sock->sk; 713 714 union { 715 int val; 716 struct linger ling; 717 struct timeval tm; 718 } v; 719 720 unsigned int lv = sizeof(int); 721 int len; 722 723 if (get_user(len, optlen)) 724 return -EFAULT; 725 if (len < 0) 726 return -EINVAL; 727 728 v.val = 0; 729 730 switch(optname) { 731 case SO_DEBUG: 732 v.val = sock_flag(sk, SOCK_DBG); 733 break; 734 735 case SO_DONTROUTE: 736 v.val = sock_flag(sk, SOCK_LOCALROUTE); 737 break; 738 739 case SO_BROADCAST: 740 v.val = !!sock_flag(sk, SOCK_BROADCAST); 741 break; 742 743 case SO_SNDBUF: 744 v.val = sk->sk_sndbuf; 745 break; 746 747 case SO_RCVBUF: 748 v.val = sk->sk_rcvbuf; 749 break; 750 751 case SO_REUSEADDR: 752 v.val = sk->sk_reuse; 753 break; 754 755 case SO_KEEPALIVE: 756 v.val = !!sock_flag(sk, SOCK_KEEPOPEN); 757 break; 758 759 case SO_TYPE: 760 v.val = sk->sk_type; 761 break; 762 763 case SO_ERROR: 764 v.val = -sock_error(sk); 765 if (v.val==0) 766 v.val = xchg(&sk->sk_err_soft, 0); 767 break; 768 769 case SO_OOBINLINE: 770 v.val = !!sock_flag(sk, SOCK_URGINLINE); 771 break; 772 773 case SO_NO_CHECK: 774 v.val = sk->sk_no_check; 775 break; 776 777 case SO_PRIORITY: 778 v.val = sk->sk_priority; 779 break; 780 781 case SO_LINGER: 782 lv = sizeof(v.ling); 783 v.ling.l_onoff = !!sock_flag(sk, SOCK_LINGER); 784 v.ling.l_linger = sk->sk_lingertime / HZ; 785 break; 786 787 case SO_BSDCOMPAT: 788 sock_warn_obsolete_bsdism("getsockopt"); 789 break; 790 791 case SO_TIMESTAMP: 792 v.val = sock_flag(sk, SOCK_RCVTSTAMP) && 793 !sock_flag(sk, SOCK_RCVTSTAMPNS); 794 break; 795 796 case SO_TIMESTAMPNS: 797 v.val = sock_flag(sk, SOCK_RCVTSTAMPNS); 798 break; 799 800 case SO_TIMESTAMPING: 801 v.val = 0; 802 if (sock_flag(sk, SOCK_TIMESTAMPING_TX_HARDWARE)) 803 v.val |= SOF_TIMESTAMPING_TX_HARDWARE; 804 if (sock_flag(sk, SOCK_TIMESTAMPING_TX_SOFTWARE)) 805 v.val |= SOF_TIMESTAMPING_TX_SOFTWARE; 806 if (sock_flag(sk, SOCK_TIMESTAMPING_RX_HARDWARE)) 807 v.val |= SOF_TIMESTAMPING_RX_HARDWARE; 808 if (sock_flag(sk, SOCK_TIMESTAMPING_RX_SOFTWARE)) 809 v.val |= SOF_TIMESTAMPING_RX_SOFTWARE; 810 if (sock_flag(sk, SOCK_TIMESTAMPING_SOFTWARE)) 811 v.val |= SOF_TIMESTAMPING_SOFTWARE; 812 if (sock_flag(sk, SOCK_TIMESTAMPING_SYS_HARDWARE)) 813 v.val |= SOF_TIMESTAMPING_SYS_HARDWARE; 814 if (sock_flag(sk, SOCK_TIMESTAMPING_RAW_HARDWARE)) 815 v.val |= SOF_TIMESTAMPING_RAW_HARDWARE; 816 break; 817 818 case SO_RCVTIMEO: 819 lv=sizeof(struct timeval); 820 if (sk->sk_rcvtimeo == MAX_SCHEDULE_TIMEOUT) { 821 v.tm.tv_sec = 0; 822 v.tm.tv_usec = 0; 823 } else { 824 v.tm.tv_sec = sk->sk_rcvtimeo / HZ; 825 v.tm.tv_usec = ((sk->sk_rcvtimeo % HZ) * 1000000) / HZ; 826 } 827 break; 828 829 case SO_SNDTIMEO: 830 lv=sizeof(struct timeval); 831 if (sk->sk_sndtimeo == MAX_SCHEDULE_TIMEOUT) { 832 v.tm.tv_sec = 0; 833 v.tm.tv_usec = 0; 834 } else { 835 v.tm.tv_sec = sk->sk_sndtimeo / HZ; 836 v.tm.tv_usec = ((sk->sk_sndtimeo % HZ) * 1000000) / HZ; 837 } 838 break; 839 840 case SO_RCVLOWAT: 841 v.val = sk->sk_rcvlowat; 842 break; 843 844 case SO_SNDLOWAT: 845 v.val=1; 846 break; 847 848 case SO_PASSCRED: 849 v.val = test_bit(SOCK_PASSCRED, &sock->flags) ? 1 : 0; 850 break; 851 852 case SO_PEERCRED: 853 if (len > sizeof(sk->sk_peercred)) 854 len = sizeof(sk->sk_peercred); 855 if (copy_to_user(optval, &sk->sk_peercred, len)) 856 return -EFAULT; 857 goto lenout; 858 859 case SO_PEERNAME: 860 { 861 char address[128]; 862 863 if (sock->ops->getname(sock, (struct sockaddr *)address, &lv, 2)) 864 return -ENOTCONN; 865 if (lv < len) 866 return -EINVAL; 867 if (copy_to_user(optval, address, len)) 868 return -EFAULT; 869 goto lenout; 870 } 871 872 /* Dubious BSD thing... Probably nobody even uses it, but 873 * the UNIX standard wants it for whatever reason... -DaveM 874 */ 875 case SO_ACCEPTCONN: 876 v.val = sk->sk_state == TCP_LISTEN; 877 break; 878 879 case SO_PASSSEC: 880 v.val = test_bit(SOCK_PASSSEC, &sock->flags) ? 1 : 0; 881 break; 882 883 case SO_PEERSEC: 884 return security_socket_getpeersec_stream(sock, optval, optlen, len); 885 886 case SO_MARK: 887 v.val = sk->sk_mark; 888 break; 889 890 default: 891 return -ENOPROTOOPT; 892 } 893 894 if (len > lv) 895 len = lv; 896 if (copy_to_user(optval, &v, len)) 897 return -EFAULT; 898lenout: 899 if (put_user(len, optlen)) 900 return -EFAULT; 901 return 0; 902} 903 904/* 905 * Initialize an sk_lock. 906 * 907 * (We also register the sk_lock with the lock validator.) 908 */ 909static inline void sock_lock_init(struct sock *sk) 910{ 911 sock_lock_init_class_and_name(sk, 912 af_family_slock_key_strings[sk->sk_family], 913 af_family_slock_keys + sk->sk_family, 914 af_family_key_strings[sk->sk_family], 915 af_family_keys + sk->sk_family); 916} 917 918static void sock_copy(struct sock *nsk, const struct sock *osk) 919{ 920#ifdef CONFIG_SECURITY_NETWORK 921 void *sptr = nsk->sk_security; 922#endif 923 924 memcpy(nsk, osk, osk->sk_prot->obj_size); 925#ifdef CONFIG_SECURITY_NETWORK 926 nsk->sk_security = sptr; 927 security_sk_clone(osk, nsk); 928#endif 929} 930 931static struct sock *sk_prot_alloc(struct proto *prot, gfp_t priority, 932 int family) 933{ 934 struct sock *sk; 935 struct kmem_cache *slab; 936 937 slab = prot->slab; 938 if (slab != NULL) 939 sk = kmem_cache_alloc(slab, priority); 940 else 941 sk = kmalloc(prot->obj_size, priority); 942 943 if (sk != NULL) { 944 if (security_sk_alloc(sk, family, priority)) 945 goto out_free; 946 947 if (!try_module_get(prot->owner)) 948 goto out_free_sec; 949 } 950 951 return sk; 952 953out_free_sec: 954 security_sk_free(sk); 955out_free: 956 if (slab != NULL) 957 kmem_cache_free(slab, sk); 958 else 959 kfree(sk); 960 return NULL; 961} 962 963static void sk_prot_free(struct proto *prot, struct sock *sk) 964{ 965 struct kmem_cache *slab; 966 struct module *owner; 967 968 owner = prot->owner; 969 slab = prot->slab; 970 971 security_sk_free(sk); 972 if (slab != NULL) 973 kmem_cache_free(slab, sk); 974 else 975 kfree(sk); 976 module_put(owner); 977} 978 979/** 980 * sk_alloc - All socket objects are allocated here 981 * @net: the applicable net namespace 982 * @family: protocol family 983 * @priority: for allocation (%GFP_KERNEL, %GFP_ATOMIC, etc) 984 * @prot: struct proto associated with this new sock instance 985 */ 986struct sock *sk_alloc(struct net *net, int family, gfp_t priority, 987 struct proto *prot) 988{ 989 struct sock *sk; 990 991 sk = sk_prot_alloc(prot, priority | __GFP_ZERO, family); 992 if (sk) { 993 sk->sk_family = family; 994 /* 995 * See comment in struct sock definition to understand 996 * why we need sk_prot_creator -acme 997 */ 998 sk->sk_prot = sk->sk_prot_creator = prot; 999 sock_lock_init(sk); 1000 sock_net_set(sk, get_net(net)); 1001 } 1002 1003 return sk; 1004} 1005 1006void sk_free(struct sock *sk) 1007{ 1008 struct sk_filter *filter; 1009 1010 if (sk->sk_destruct) 1011 sk->sk_destruct(sk); 1012 1013 filter = rcu_dereference(sk->sk_filter); 1014 if (filter) { 1015 sk_filter_uncharge(sk, filter); 1016 rcu_assign_pointer(sk->sk_filter, NULL); 1017 } 1018 1019 sock_disable_timestamp(sk, SOCK_TIMESTAMP); 1020 sock_disable_timestamp(sk, SOCK_TIMESTAMPING_RX_SOFTWARE); 1021 1022 if (atomic_read(&sk->sk_omem_alloc)) 1023 printk(KERN_DEBUG "%s: optmem leakage (%d bytes) detected.\n", 1024 __func__, atomic_read(&sk->sk_omem_alloc)); 1025 1026 put_net(sock_net(sk)); 1027 sk_prot_free(sk->sk_prot_creator, sk); 1028} 1029 1030/* 1031 * Last sock_put should drop referrence to sk->sk_net. It has already 1032 * been dropped in sk_change_net. Taking referrence to stopping namespace 1033 * is not an option. 1034 * Take referrence to a socket to remove it from hash _alive_ and after that 1035 * destroy it in the context of init_net. 1036 */ 1037void sk_release_kernel(struct sock *sk) 1038{ 1039 if (sk == NULL || sk->sk_socket == NULL) 1040 return; 1041 1042 sock_hold(sk); 1043 sock_release(sk->sk_socket); 1044 release_net(sock_net(sk)); 1045 sock_net_set(sk, get_net(&init_net)); 1046 sock_put(sk); 1047} 1048EXPORT_SYMBOL(sk_release_kernel); 1049 1050struct sock *sk_clone(const struct sock *sk, const gfp_t priority) 1051{ 1052 struct sock *newsk; 1053 1054 newsk = sk_prot_alloc(sk->sk_prot, priority, sk->sk_family); 1055 if (newsk != NULL) { 1056 struct sk_filter *filter; 1057 1058 sock_copy(newsk, sk); 1059 1060 /* SANITY */ 1061 get_net(sock_net(newsk)); 1062 sk_node_init(&newsk->sk_node); 1063 sock_lock_init(newsk); 1064 bh_lock_sock(newsk); 1065 newsk->sk_backlog.head = newsk->sk_backlog.tail = NULL; 1066 1067 atomic_set(&newsk->sk_rmem_alloc, 0); 1068 atomic_set(&newsk->sk_wmem_alloc, 0); 1069 atomic_set(&newsk->sk_omem_alloc, 0); 1070 skb_queue_head_init(&newsk->sk_receive_queue); 1071 skb_queue_head_init(&newsk->sk_write_queue); 1072#ifdef CONFIG_NET_DMA 1073 skb_queue_head_init(&newsk->sk_async_wait_queue); 1074#endif 1075 1076 rwlock_init(&newsk->sk_dst_lock); 1077 rwlock_init(&newsk->sk_callback_lock); 1078 lockdep_set_class_and_name(&newsk->sk_callback_lock, 1079 af_callback_keys + newsk->sk_family, 1080 af_family_clock_key_strings[newsk->sk_family]); 1081 1082 newsk->sk_dst_cache = NULL; 1083 newsk->sk_wmem_queued = 0; 1084 newsk->sk_forward_alloc = 0; 1085 newsk->sk_send_head = NULL; 1086 newsk->sk_userlocks = sk->sk_userlocks & ~SOCK_BINDPORT_LOCK; 1087 1088 sock_reset_flag(newsk, SOCK_DONE); 1089 skb_queue_head_init(&newsk->sk_error_queue); 1090 1091 filter = newsk->sk_filter; 1092 if (filter != NULL) 1093 sk_filter_charge(newsk, filter); 1094 1095 if (unlikely(xfrm_sk_clone_policy(newsk))) { 1096 /* It is still raw copy of parent, so invalidate 1097 * destructor and make plain sk_free() */ 1098 newsk->sk_destruct = NULL; 1099 sk_free(newsk); 1100 newsk = NULL; 1101 goto out; 1102 } 1103 1104 newsk->sk_err = 0; 1105 newsk->sk_priority = 0; 1106 atomic_set(&newsk->sk_refcnt, 2); 1107 1108 /* 1109 * Increment the counter in the same struct proto as the master 1110 * sock (sk_refcnt_debug_inc uses newsk->sk_prot->socks, that 1111 * is the same as sk->sk_prot->socks, as this field was copied 1112 * with memcpy). 1113 * 1114 * This _changes_ the previous behaviour, where 1115 * tcp_create_openreq_child always was incrementing the 1116 * equivalent to tcp_prot->socks (inet_sock_nr), so this have 1117 * to be taken into account in all callers. -acme 1118 */ 1119 sk_refcnt_debug_inc(newsk); 1120 sk_set_socket(newsk, NULL); 1121 newsk->sk_sleep = NULL; 1122 1123 if (newsk->sk_prot->sockets_allocated) 1124 percpu_counter_inc(newsk->sk_prot->sockets_allocated); 1125 } 1126out: 1127 return newsk; 1128} 1129 1130EXPORT_SYMBOL_GPL(sk_clone); 1131 1132void sk_setup_caps(struct sock *sk, struct dst_entry *dst) 1133{ 1134 __sk_dst_set(sk, dst); 1135 sk->sk_route_caps = dst->dev->features; 1136 if (sk->sk_route_caps & NETIF_F_GSO) 1137 sk->sk_route_caps |= NETIF_F_GSO_SOFTWARE; 1138 if (sk_can_gso(sk)) { 1139 if (dst->header_len) { 1140 sk->sk_route_caps &= ~NETIF_F_GSO_MASK; 1141 } else { 1142 sk->sk_route_caps |= NETIF_F_SG | NETIF_F_HW_CSUM; 1143 sk->sk_gso_max_size = dst->dev->gso_max_size; 1144 } 1145 } 1146} 1147EXPORT_SYMBOL_GPL(sk_setup_caps); 1148 1149void __init sk_init(void) 1150{ 1151 if (num_physpages <= 4096) { 1152 sysctl_wmem_max = 32767; 1153 sysctl_rmem_max = 32767; 1154 sysctl_wmem_default = 32767; 1155 sysctl_rmem_default = 32767; 1156 } else if (num_physpages >= 131072) { 1157 sysctl_wmem_max = 131071; 1158 sysctl_rmem_max = 131071; 1159 } 1160} 1161 1162/* 1163 * Simple resource managers for sockets. 1164 */ 1165 1166 1167/* 1168 * Write buffer destructor automatically called from kfree_skb. 1169 */ 1170void sock_wfree(struct sk_buff *skb) 1171{ 1172 struct sock *sk = skb->sk; 1173 1174 /* In case it might be waiting for more memory. */ 1175 atomic_sub(skb->truesize, &sk->sk_wmem_alloc); 1176 if (!sock_flag(sk, SOCK_USE_WRITE_QUEUE)) 1177 sk->sk_write_space(sk); 1178 sock_put(sk); 1179} 1180 1181/* 1182 * Read buffer destructor automatically called from kfree_skb. 1183 */ 1184void sock_rfree(struct sk_buff *skb) 1185{ 1186 struct sock *sk = skb->sk; 1187 1188 skb_truesize_check(skb); 1189 atomic_sub(skb->truesize, &sk->sk_rmem_alloc); 1190 sk_mem_uncharge(skb->sk, skb->truesize); 1191} 1192 1193 1194int sock_i_uid(struct sock *sk) 1195{ 1196 int uid; 1197 1198 read_lock(&sk->sk_callback_lock); 1199 uid = sk->sk_socket ? SOCK_INODE(sk->sk_socket)->i_uid : 0; 1200 read_unlock(&sk->sk_callback_lock); 1201 return uid; 1202} 1203 1204unsigned long sock_i_ino(struct sock *sk) 1205{ 1206 unsigned long ino; 1207 1208 read_lock(&sk->sk_callback_lock); 1209 ino = sk->sk_socket ? SOCK_INODE(sk->sk_socket)->i_ino : 0; 1210 read_unlock(&sk->sk_callback_lock); 1211 return ino; 1212} 1213 1214/* 1215 * Allocate a skb from the socket's send buffer. 1216 */ 1217struct sk_buff *sock_wmalloc(struct sock *sk, unsigned long size, int force, 1218 gfp_t priority) 1219{ 1220 if (force || atomic_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf) { 1221 struct sk_buff * skb = alloc_skb(size, priority); 1222 if (skb) { 1223 skb_set_owner_w(skb, sk); 1224 return skb; 1225 } 1226 } 1227 return NULL; 1228} 1229 1230/* 1231 * Allocate a skb from the socket's receive buffer. 1232 */ 1233struct sk_buff *sock_rmalloc(struct sock *sk, unsigned long size, int force, 1234 gfp_t priority) 1235{ 1236 if (force || atomic_read(&sk->sk_rmem_alloc) < sk->sk_rcvbuf) { 1237 struct sk_buff *skb = alloc_skb(size, priority); 1238 if (skb) { 1239 skb_set_owner_r(skb, sk); 1240 return skb; 1241 } 1242 } 1243 return NULL; 1244} 1245 1246/* 1247 * Allocate a memory block from the socket's option memory buffer. 1248 */ 1249void *sock_kmalloc(struct sock *sk, int size, gfp_t priority) 1250{ 1251 if ((unsigned)size <= sysctl_optmem_max && 1252 atomic_read(&sk->sk_omem_alloc) + size < sysctl_optmem_max) { 1253 void *mem; 1254 /* First do the add, to avoid the race if kmalloc 1255 * might sleep. 1256 */ 1257 atomic_add(size, &sk->sk_omem_alloc); 1258 mem = kmalloc(size, priority); 1259 if (mem) 1260 return mem; 1261 atomic_sub(size, &sk->sk_omem_alloc); 1262 } 1263 return NULL; 1264} 1265 1266/* 1267 * Free an option memory block. 1268 */ 1269void sock_kfree_s(struct sock *sk, void *mem, int size) 1270{ 1271 kfree(mem); 1272 atomic_sub(size, &sk->sk_omem_alloc); 1273} 1274 1275/* It is almost wait_for_tcp_memory minus release_sock/lock_sock. 1276 I think, these locks should be removed for datagram sockets. 1277 */ 1278static long sock_wait_for_wmem(struct sock * sk, long timeo) 1279{ 1280 DEFINE_WAIT(wait); 1281 1282 clear_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags); 1283 for (;;) { 1284 if (!timeo) 1285 break; 1286 if (signal_pending(current)) 1287 break; 1288 set_bit(SOCK_NOSPACE, &sk->sk_socket->flags); 1289 prepare_to_wait(sk->sk_sleep, &wait, TASK_INTERRUPTIBLE); 1290 if (atomic_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf) 1291 break; 1292 if (sk->sk_shutdown & SEND_SHUTDOWN) 1293 break; 1294 if (sk->sk_err) 1295 break; 1296 timeo = schedule_timeout(timeo); 1297 } 1298 finish_wait(sk->sk_sleep, &wait); 1299 return timeo; 1300} 1301 1302 1303/* 1304 * Generic send/receive buffer handlers 1305 */ 1306 1307struct sk_buff *sock_alloc_send_pskb(struct sock *sk, unsigned long header_len, 1308 unsigned long data_len, int noblock, 1309 int *errcode) 1310{ 1311 struct sk_buff *skb; 1312 gfp_t gfp_mask; 1313 long timeo; 1314 int err; 1315 1316 gfp_mask = sk->sk_allocation; 1317 if (gfp_mask & __GFP_WAIT) 1318 gfp_mask |= __GFP_REPEAT; 1319 1320 timeo = sock_sndtimeo(sk, noblock); 1321 while (1) { 1322 err = sock_error(sk); 1323 if (err != 0) 1324 goto failure; 1325 1326 err = -EPIPE; 1327 if (sk->sk_shutdown & SEND_SHUTDOWN) 1328 goto failure; 1329 1330 if (atomic_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf) { 1331 skb = alloc_skb(header_len, gfp_mask); 1332 if (skb) { 1333 int npages; 1334 int i; 1335 1336 /* No pages, we're done... */ 1337 if (!data_len) 1338 break; 1339 1340 npages = (data_len + (PAGE_SIZE - 1)) >> PAGE_SHIFT; 1341 skb->truesize += data_len; 1342 skb_shinfo(skb)->nr_frags = npages; 1343 for (i = 0; i < npages; i++) { 1344 struct page *page; 1345 skb_frag_t *frag; 1346 1347 page = alloc_pages(sk->sk_allocation, 0); 1348 if (!page) { 1349 err = -ENOBUFS; 1350 skb_shinfo(skb)->nr_frags = i; 1351 kfree_skb(skb); 1352 goto failure; 1353 } 1354 1355 frag = &skb_shinfo(skb)->frags[i]; 1356 frag->page = page; 1357 frag->page_offset = 0; 1358 frag->size = (data_len >= PAGE_SIZE ? 1359 PAGE_SIZE : 1360 data_len); 1361 data_len -= PAGE_SIZE; 1362 } 1363 1364 /* Full success... */ 1365 break; 1366 } 1367 err = -ENOBUFS; 1368 goto failure; 1369 } 1370 set_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags); 1371 set_bit(SOCK_NOSPACE, &sk->sk_socket->flags); 1372 err = -EAGAIN; 1373 if (!timeo) 1374 goto failure; 1375 if (signal_pending(current)) 1376 goto interrupted; 1377 timeo = sock_wait_for_wmem(sk, timeo); 1378 } 1379 1380 skb_set_owner_w(skb, sk); 1381 return skb; 1382 1383interrupted: 1384 err = sock_intr_errno(timeo); 1385failure: 1386 *errcode = err; 1387 return NULL; 1388} 1389EXPORT_SYMBOL(sock_alloc_send_pskb); 1390 1391struct sk_buff *sock_alloc_send_skb(struct sock *sk, unsigned long size, 1392 int noblock, int *errcode) 1393{ 1394 return sock_alloc_send_pskb(sk, size, 0, noblock, errcode); 1395} 1396 1397static void __lock_sock(struct sock *sk) 1398{ 1399 DEFINE_WAIT(wait); 1400 1401 for (;;) { 1402 prepare_to_wait_exclusive(&sk->sk_lock.wq, &wait, 1403 TASK_UNINTERRUPTIBLE); 1404 spin_unlock_bh(&sk->sk_lock.slock); 1405 schedule(); 1406 spin_lock_bh(&sk->sk_lock.slock); 1407 if (!sock_owned_by_user(sk)) 1408 break; 1409 } 1410 finish_wait(&sk->sk_lock.wq, &wait); 1411} 1412 1413static void __release_sock(struct sock *sk) 1414{ 1415 struct sk_buff *skb = sk->sk_backlog.head; 1416 1417 do { 1418 sk->sk_backlog.head = sk->sk_backlog.tail = NULL; 1419 bh_unlock_sock(sk); 1420 1421 do { 1422 struct sk_buff *next = skb->next; 1423 1424 skb->next = NULL; 1425 sk_backlog_rcv(sk, skb); 1426 1427 /* 1428 * We are in process context here with softirqs 1429 * disabled, use cond_resched_softirq() to preempt. 1430 * This is safe to do because we've taken the backlog 1431 * queue private: 1432 */ 1433 cond_resched_softirq(); 1434 1435 skb = next; 1436 } while (skb != NULL); 1437 1438 bh_lock_sock(sk); 1439 } while ((skb = sk->sk_backlog.head) != NULL); 1440} 1441 1442/** 1443 * sk_wait_data - wait for data to arrive at sk_receive_queue 1444 * @sk: sock to wait on 1445 * @timeo: for how long 1446 * 1447 * Now socket state including sk->sk_err is changed only under lock, 1448 * hence we may omit checks after joining wait queue. 1449 * We check receive queue before schedule() only as optimization; 1450 * it is very likely that release_sock() added new data. 1451 */ 1452int sk_wait_data(struct sock *sk, long *timeo) 1453{ 1454 int rc; 1455 DEFINE_WAIT(wait); 1456 1457 prepare_to_wait(sk->sk_sleep, &wait, TASK_INTERRUPTIBLE); 1458 set_bit(SOCK_ASYNC_WAITDATA, &sk->sk_socket->flags); 1459 rc = sk_wait_event(sk, timeo, !skb_queue_empty(&sk->sk_receive_queue)); 1460 clear_bit(SOCK_ASYNC_WAITDATA, &sk->sk_socket->flags); 1461 finish_wait(sk->sk_sleep, &wait); 1462 return rc; 1463} 1464 1465EXPORT_SYMBOL(sk_wait_data); 1466 1467/** 1468 * __sk_mem_schedule - increase sk_forward_alloc and memory_allocated 1469 * @sk: socket 1470 * @size: memory size to allocate 1471 * @kind: allocation type 1472 * 1473 * If kind is SK_MEM_SEND, it means wmem allocation. Otherwise it means 1474 * rmem allocation. This function assumes that protocols which have 1475 * memory_pressure use sk_wmem_queued as write buffer accounting. 1476 */ 1477int __sk_mem_schedule(struct sock *sk, int size, int kind) 1478{ 1479 struct proto *prot = sk->sk_prot; 1480 int amt = sk_mem_pages(size); 1481 int allocated; 1482 1483 sk->sk_forward_alloc += amt * SK_MEM_QUANTUM; 1484 allocated = atomic_add_return(amt, prot->memory_allocated); 1485 1486 /* Under limit. */ 1487 if (allocated <= prot->sysctl_mem[0]) { 1488 if (prot->memory_pressure && *prot->memory_pressure) 1489 *prot->memory_pressure = 0; 1490 return 1; 1491 } 1492 1493 /* Under pressure. */ 1494 if (allocated > prot->sysctl_mem[1]) 1495 if (prot->enter_memory_pressure) 1496 prot->enter_memory_pressure(sk); 1497 1498 /* Over hard limit. */ 1499 if (allocated > prot->sysctl_mem[2]) 1500 goto suppress_allocation; 1501 1502 /* guarantee minimum buffer size under pressure */ 1503 if (kind == SK_MEM_RECV) { 1504 if (atomic_read(&sk->sk_rmem_alloc) < prot->sysctl_rmem[0]) 1505 return 1; 1506 } else { /* SK_MEM_SEND */ 1507 if (sk->sk_type == SOCK_STREAM) { 1508 if (sk->sk_wmem_queued < prot->sysctl_wmem[0]) 1509 return 1; 1510 } else if (atomic_read(&sk->sk_wmem_alloc) < 1511 prot->sysctl_wmem[0]) 1512 return 1; 1513 } 1514 1515 if (prot->memory_pressure) { 1516 int alloc; 1517 1518 if (!*prot->memory_pressure) 1519 return 1; 1520 alloc = percpu_counter_read_positive(prot->sockets_allocated); 1521 if (prot->sysctl_mem[2] > alloc * 1522 sk_mem_pages(sk->sk_wmem_queued + 1523 atomic_read(&sk->sk_rmem_alloc) + 1524 sk->sk_forward_alloc)) 1525 return 1; 1526 } 1527 1528suppress_allocation: 1529 1530 if (kind == SK_MEM_SEND && sk->sk_type == SOCK_STREAM) { 1531 sk_stream_moderate_sndbuf(sk); 1532 1533 /* Fail only if socket is _under_ its sndbuf. 1534 * In this case we cannot block, so that we have to fail. 1535 */ 1536 if (sk->sk_wmem_queued + size >= sk->sk_sndbuf) 1537 return 1; 1538 } 1539 1540 /* Alas. Undo changes. */ 1541 sk->sk_forward_alloc -= amt * SK_MEM_QUANTUM; 1542 atomic_sub(amt, prot->memory_allocated); 1543 return 0; 1544} 1545 1546EXPORT_SYMBOL(__sk_mem_schedule); 1547 1548/** 1549 * __sk_reclaim - reclaim memory_allocated 1550 * @sk: socket 1551 */ 1552void __sk_mem_reclaim(struct sock *sk) 1553{ 1554 struct proto *prot = sk->sk_prot; 1555 1556 atomic_sub(sk->sk_forward_alloc >> SK_MEM_QUANTUM_SHIFT, 1557 prot->memory_allocated); 1558 sk->sk_forward_alloc &= SK_MEM_QUANTUM - 1; 1559 1560 if (prot->memory_pressure && *prot->memory_pressure && 1561 (atomic_read(prot->memory_allocated) < prot->sysctl_mem[0])) 1562 *prot->memory_pressure = 0; 1563} 1564 1565EXPORT_SYMBOL(__sk_mem_reclaim); 1566 1567 1568/* 1569 * Set of default routines for initialising struct proto_ops when 1570 * the protocol does not support a particular function. In certain 1571 * cases where it makes no sense for a protocol to have a "do nothing" 1572 * function, some default processing is provided. 1573 */ 1574 1575int sock_no_bind(struct socket *sock, struct sockaddr *saddr, int len) 1576{ 1577 return -EOPNOTSUPP; 1578} 1579 1580int sock_no_connect(struct socket *sock, struct sockaddr *saddr, 1581 int len, int flags) 1582{ 1583 return -EOPNOTSUPP; 1584} 1585 1586int sock_no_socketpair(struct socket *sock1, struct socket *sock2) 1587{ 1588 return -EOPNOTSUPP; 1589} 1590 1591int sock_no_accept(struct socket *sock, struct socket *newsock, int flags) 1592{ 1593 return -EOPNOTSUPP; 1594} 1595 1596int sock_no_getname(struct socket *sock, struct sockaddr *saddr, 1597 int *len, int peer) 1598{ 1599 return -EOPNOTSUPP; 1600} 1601 1602unsigned int sock_no_poll(struct file * file, struct socket *sock, poll_table *pt) 1603{ 1604 return 0; 1605} 1606 1607int sock_no_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg) 1608{ 1609 return -EOPNOTSUPP; 1610} 1611 1612int sock_no_listen(struct socket *sock, int backlog) 1613{ 1614 return -EOPNOTSUPP; 1615} 1616 1617int sock_no_shutdown(struct socket *sock, int how) 1618{ 1619 return -EOPNOTSUPP; 1620} 1621 1622int sock_no_setsockopt(struct socket *sock, int level, int optname, 1623 char __user *optval, int optlen) 1624{ 1625 return -EOPNOTSUPP; 1626} 1627 1628int sock_no_getsockopt(struct socket *sock, int level, int optname, 1629 char __user *optval, int __user *optlen) 1630{ 1631 return -EOPNOTSUPP; 1632} 1633 1634int sock_no_sendmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *m, 1635 size_t len) 1636{ 1637 return -EOPNOTSUPP; 1638} 1639 1640int sock_no_recvmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *m, 1641 size_t len, int flags) 1642{ 1643 return -EOPNOTSUPP; 1644} 1645 1646int sock_no_mmap(struct file *file, struct socket *sock, struct vm_area_struct *vma) 1647{ 1648 /* Mirror missing mmap method error code */ 1649 return -ENODEV; 1650} 1651 1652ssize_t sock_no_sendpage(struct socket *sock, struct page *page, int offset, size_t size, int flags) 1653{ 1654 ssize_t res; 1655 struct msghdr msg = {.msg_flags = flags}; 1656 struct kvec iov; 1657 char *kaddr = kmap(page); 1658 iov.iov_base = kaddr + offset; 1659 iov.iov_len = size; 1660 res = kernel_sendmsg(sock, &msg, &iov, 1, size); 1661 kunmap(page); 1662 return res; 1663} 1664 1665/* 1666 * Default Socket Callbacks 1667 */ 1668 1669static void sock_def_wakeup(struct sock *sk) 1670{ 1671 read_lock(&sk->sk_callback_lock); 1672 if (sk->sk_sleep && waitqueue_active(sk->sk_sleep)) 1673 wake_up_interruptible_all(sk->sk_sleep); 1674 read_unlock(&sk->sk_callback_lock); 1675} 1676 1677static void sock_def_error_report(struct sock *sk) 1678{ 1679 read_lock(&sk->sk_callback_lock); 1680 if (sk->sk_sleep && waitqueue_active(sk->sk_sleep)) 1681 wake_up_interruptible(sk->sk_sleep); 1682 sk_wake_async(sk, SOCK_WAKE_IO, POLL_ERR); 1683 read_unlock(&sk->sk_callback_lock); 1684} 1685 1686static void sock_def_readable(struct sock *sk, int len) 1687{ 1688 read_lock(&sk->sk_callback_lock); 1689 if (sk->sk_sleep && waitqueue_active(sk->sk_sleep)) 1690 wake_up_interruptible_sync(sk->sk_sleep); 1691 sk_wake_async(sk, SOCK_WAKE_WAITD, POLL_IN); 1692 read_unlock(&sk->sk_callback_lock); 1693} 1694 1695static void sock_def_write_space(struct sock *sk) 1696{ 1697 read_lock(&sk->sk_callback_lock); 1698 1699 /* Do not wake up a writer until he can make "significant" 1700 * progress. --DaveM 1701 */ 1702 if ((atomic_read(&sk->sk_wmem_alloc) << 1) <= sk->sk_sndbuf) { 1703 if (sk->sk_sleep && waitqueue_active(sk->sk_sleep)) 1704 wake_up_interruptible_sync(sk->sk_sleep); 1705 1706 /* Should agree with poll, otherwise some programs break */ 1707 if (sock_writeable(sk)) 1708 sk_wake_async(sk, SOCK_WAKE_SPACE, POLL_OUT); 1709 } 1710 1711 read_unlock(&sk->sk_callback_lock); 1712} 1713 1714static void sock_def_destruct(struct sock *sk) 1715{ 1716 kfree(sk->sk_protinfo); 1717} 1718 1719void sk_send_sigurg(struct sock *sk) 1720{ 1721 if (sk->sk_socket && sk->sk_socket->file) 1722 if (send_sigurg(&sk->sk_socket->file->f_owner)) 1723 sk_wake_async(sk, SOCK_WAKE_URG, POLL_PRI); 1724} 1725 1726void sk_reset_timer(struct sock *sk, struct timer_list* timer, 1727 unsigned long expires) 1728{ 1729 if (!mod_timer(timer, expires)) 1730 sock_hold(sk); 1731} 1732 1733EXPORT_SYMBOL(sk_reset_timer); 1734 1735void sk_stop_timer(struct sock *sk, struct timer_list* timer) 1736{ 1737 if (timer_pending(timer) && del_timer(timer)) 1738 __sock_put(sk); 1739} 1740 1741EXPORT_SYMBOL(sk_stop_timer); 1742 1743void sock_init_data(struct socket *sock, struct sock *sk) 1744{ 1745 skb_queue_head_init(&sk->sk_receive_queue); 1746 skb_queue_head_init(&sk->sk_write_queue); 1747 skb_queue_head_init(&sk->sk_error_queue); 1748#ifdef CONFIG_NET_DMA 1749 skb_queue_head_init(&sk->sk_async_wait_queue); 1750#endif 1751 1752 sk->sk_send_head = NULL; 1753 1754 init_timer(&sk->sk_timer); 1755 1756 sk->sk_allocation = GFP_KERNEL; 1757 sk->sk_rcvbuf = sysctl_rmem_default; 1758 sk->sk_sndbuf = sysctl_wmem_default; 1759 sk->sk_state = TCP_CLOSE; 1760 sk_set_socket(sk, sock); 1761 1762 sock_set_flag(sk, SOCK_ZAPPED); 1763 1764 if (sock) { 1765 sk->sk_type = sock->type; 1766 sk->sk_sleep = &sock->wait; 1767 sock->sk = sk; 1768 } else 1769 sk->sk_sleep = NULL; 1770 1771 rwlock_init(&sk->sk_dst_lock); 1772 rwlock_init(&sk->sk_callback_lock); 1773 lockdep_set_class_and_name(&sk->sk_callback_lock, 1774 af_callback_keys + sk->sk_family, 1775 af_family_clock_key_strings[sk->sk_family]); 1776 1777 sk->sk_state_change = sock_def_wakeup; 1778 sk->sk_data_ready = sock_def_readable; 1779 sk->sk_write_space = sock_def_write_space; 1780 sk->sk_error_report = sock_def_error_report; 1781 sk->sk_destruct = sock_def_destruct; 1782 1783 sk->sk_sndmsg_page = NULL; 1784 sk->sk_sndmsg_off = 0; 1785 1786 sk->sk_peercred.pid = 0; 1787 sk->sk_peercred.uid = -1; 1788 sk->sk_peercred.gid = -1; 1789 sk->sk_write_pending = 0; 1790 sk->sk_rcvlowat = 1; 1791 sk->sk_rcvtimeo = MAX_SCHEDULE_TIMEOUT; 1792 sk->sk_sndtimeo = MAX_SCHEDULE_TIMEOUT; 1793 1794 sk->sk_stamp = ktime_set(-1L, 0); 1795 1796 atomic_set(&sk->sk_refcnt, 1); 1797 atomic_set(&sk->sk_drops, 0); 1798} 1799 1800void lock_sock_nested(struct sock *sk, int subclass) 1801{ 1802 might_sleep(); 1803 spin_lock_bh(&sk->sk_lock.slock); 1804 if (sk->sk_lock.owned) 1805 __lock_sock(sk); 1806 sk->sk_lock.owned = 1; 1807 spin_unlock(&sk->sk_lock.slock); 1808 /* 1809 * The sk_lock has mutex_lock() semantics here: 1810 */ 1811 mutex_acquire(&sk->sk_lock.dep_map, subclass, 0, _RET_IP_); 1812 local_bh_enable(); 1813} 1814 1815EXPORT_SYMBOL(lock_sock_nested); 1816 1817void release_sock(struct sock *sk) 1818{ 1819 /* 1820 * The sk_lock has mutex_unlock() semantics: 1821 */ 1822 mutex_release(&sk->sk_lock.dep_map, 1, _RET_IP_); 1823 1824 spin_lock_bh(&sk->sk_lock.slock); 1825 if (sk->sk_backlog.tail) 1826 __release_sock(sk); 1827 sk->sk_lock.owned = 0; 1828 if (waitqueue_active(&sk->sk_lock.wq)) 1829 wake_up(&sk->sk_lock.wq); 1830 spin_unlock_bh(&sk->sk_lock.slock); 1831} 1832EXPORT_SYMBOL(release_sock); 1833 1834int sock_get_timestamp(struct sock *sk, struct timeval __user *userstamp) 1835{ 1836 struct timeval tv; 1837 if (!sock_flag(sk, SOCK_TIMESTAMP)) 1838 sock_enable_timestamp(sk, SOCK_TIMESTAMP); 1839 tv = ktime_to_timeval(sk->sk_stamp); 1840 if (tv.tv_sec == -1) 1841 return -ENOENT; 1842 if (tv.tv_sec == 0) { 1843 sk->sk_stamp = ktime_get_real(); 1844 tv = ktime_to_timeval(sk->sk_stamp); 1845 } 1846 return copy_to_user(userstamp, &tv, sizeof(tv)) ? -EFAULT : 0; 1847} 1848EXPORT_SYMBOL(sock_get_timestamp); 1849 1850int sock_get_timestampns(struct sock *sk, struct timespec __user *userstamp) 1851{ 1852 struct timespec ts; 1853 if (!sock_flag(sk, SOCK_TIMESTAMP)) 1854 sock_enable_timestamp(sk, SOCK_TIMESTAMP); 1855 ts = ktime_to_timespec(sk->sk_stamp); 1856 if (ts.tv_sec == -1) 1857 return -ENOENT; 1858 if (ts.tv_sec == 0) { 1859 sk->sk_stamp = ktime_get_real(); 1860 ts = ktime_to_timespec(sk->sk_stamp); 1861 } 1862 return copy_to_user(userstamp, &ts, sizeof(ts)) ? -EFAULT : 0; 1863} 1864EXPORT_SYMBOL(sock_get_timestampns); 1865 1866void sock_enable_timestamp(struct sock *sk, int flag) 1867{ 1868 if (!sock_flag(sk, flag)) { 1869 sock_set_flag(sk, flag); 1870 /* 1871 * we just set one of the two flags which require net 1872 * time stamping, but time stamping might have been on 1873 * already because of the other one 1874 */ 1875 if (!sock_flag(sk, 1876 flag == SOCK_TIMESTAMP ? 1877 SOCK_TIMESTAMPING_RX_SOFTWARE : 1878 SOCK_TIMESTAMP)) 1879 net_enable_timestamp(); 1880 } 1881} 1882 1883/* 1884 * Get a socket option on an socket. 1885 * 1886 * FIX: POSIX 1003.1g is very ambiguous here. It states that 1887 * asynchronous errors should be reported by getsockopt. We assume 1888 * this means if you specify SO_ERROR (otherwise whats the point of it). 1889 */ 1890int sock_common_getsockopt(struct socket *sock, int level, int optname, 1891 char __user *optval, int __user *optlen) 1892{ 1893 struct sock *sk = sock->sk; 1894 1895 return sk->sk_prot->getsockopt(sk, level, optname, optval, optlen); 1896} 1897 1898EXPORT_SYMBOL(sock_common_getsockopt); 1899 1900#ifdef CONFIG_COMPAT 1901int compat_sock_common_getsockopt(struct socket *sock, int level, int optname, 1902 char __user *optval, int __user *optlen) 1903{ 1904 struct sock *sk = sock->sk; 1905 1906 if (sk->sk_prot->compat_getsockopt != NULL) 1907 return sk->sk_prot->compat_getsockopt(sk, level, optname, 1908 optval, optlen); 1909 return sk->sk_prot->getsockopt(sk, level, optname, optval, optlen); 1910} 1911EXPORT_SYMBOL(compat_sock_common_getsockopt); 1912#endif 1913 1914int sock_common_recvmsg(struct kiocb *iocb, struct socket *sock, 1915 struct msghdr *msg, size_t size, int flags) 1916{ 1917 struct sock *sk = sock->sk; 1918 int addr_len = 0; 1919 int err; 1920 1921 err = sk->sk_prot->recvmsg(iocb, sk, msg, size, flags & MSG_DONTWAIT, 1922 flags & ~MSG_DONTWAIT, &addr_len); 1923 if (err >= 0) 1924 msg->msg_namelen = addr_len; 1925 return err; 1926} 1927 1928EXPORT_SYMBOL(sock_common_recvmsg); 1929 1930/* 1931 * Set socket options on an inet socket. 1932 */ 1933int sock_common_setsockopt(struct socket *sock, int level, int optname, 1934 char __user *optval, int optlen) 1935{ 1936 struct sock *sk = sock->sk; 1937 1938 return sk->sk_prot->setsockopt(sk, level, optname, optval, optlen); 1939} 1940 1941EXPORT_SYMBOL(sock_common_setsockopt); 1942 1943#ifdef CONFIG_COMPAT 1944int compat_sock_common_setsockopt(struct socket *sock, int level, int optname, 1945 char __user *optval, int optlen) 1946{ 1947 struct sock *sk = sock->sk; 1948 1949 if (sk->sk_prot->compat_setsockopt != NULL) 1950 return sk->sk_prot->compat_setsockopt(sk, level, optname, 1951 optval, optlen); 1952 return sk->sk_prot->setsockopt(sk, level, optname, optval, optlen); 1953} 1954EXPORT_SYMBOL(compat_sock_common_setsockopt); 1955#endif 1956 1957void sk_common_release(struct sock *sk) 1958{ 1959 if (sk->sk_prot->destroy) 1960 sk->sk_prot->destroy(sk); 1961 1962 /* 1963 * Observation: when sock_common_release is called, processes have 1964 * no access to socket. But net still has. 1965 * Step one, detach it from networking: 1966 * 1967 * A. Remove from hash tables. 1968 */ 1969 1970 sk->sk_prot->unhash(sk); 1971 1972 /* 1973 * In this point socket cannot receive new packets, but it is possible 1974 * that some packets are in flight because some CPU runs receiver and 1975 * did hash table lookup before we unhashed socket. They will achieve 1976 * receive queue and will be purged by socket destructor. 1977 * 1978 * Also we still have packets pending on receive queue and probably, 1979 * our own packets waiting in device queues. sock_destroy will drain 1980 * receive queue, but transmitted packets will delay socket destruction 1981 * until the last reference will be released. 1982 */ 1983 1984 sock_orphan(sk); 1985 1986 xfrm_sk_free_policy(sk); 1987 1988 sk_refcnt_debug_release(sk); 1989 sock_put(sk); 1990} 1991 1992EXPORT_SYMBOL(sk_common_release); 1993 1994static DEFINE_RWLOCK(proto_list_lock); 1995static LIST_HEAD(proto_list); 1996 1997#ifdef CONFIG_PROC_FS 1998#define PROTO_INUSE_NR 64 /* should be enough for the first time */ 1999struct prot_inuse { 2000 int val[PROTO_INUSE_NR]; 2001}; 2002 2003static DECLARE_BITMAP(proto_inuse_idx, PROTO_INUSE_NR); 2004 2005#ifdef CONFIG_NET_NS 2006void sock_prot_inuse_add(struct net *net, struct proto *prot, int val) 2007{ 2008 int cpu = smp_processor_id(); 2009 per_cpu_ptr(net->core.inuse, cpu)->val[prot->inuse_idx] += val; 2010} 2011EXPORT_SYMBOL_GPL(sock_prot_inuse_add); 2012 2013int sock_prot_inuse_get(struct net *net, struct proto *prot) 2014{ 2015 int cpu, idx = prot->inuse_idx; 2016 int res = 0; 2017 2018 for_each_possible_cpu(cpu) 2019 res += per_cpu_ptr(net->core.inuse, cpu)->val[idx]; 2020 2021 return res >= 0 ? res : 0; 2022} 2023EXPORT_SYMBOL_GPL(sock_prot_inuse_get); 2024 2025static int sock_inuse_init_net(struct net *net) 2026{ 2027 net->core.inuse = alloc_percpu(struct prot_inuse); 2028 return net->core.inuse ? 0 : -ENOMEM; 2029} 2030 2031static void sock_inuse_exit_net(struct net *net) 2032{ 2033 free_percpu(net->core.inuse); 2034} 2035 2036static struct pernet_operations net_inuse_ops = { 2037 .init = sock_inuse_init_net, 2038 .exit = sock_inuse_exit_net, 2039}; 2040 2041static __init int net_inuse_init(void) 2042{ 2043 if (register_pernet_subsys(&net_inuse_ops)) 2044 panic("Cannot initialize net inuse counters"); 2045 2046 return 0; 2047} 2048 2049core_initcall(net_inuse_init); 2050#else 2051static DEFINE_PER_CPU(struct prot_inuse, prot_inuse); 2052 2053void sock_prot_inuse_add(struct net *net, struct proto *prot, int val) 2054{ 2055 __get_cpu_var(prot_inuse).val[prot->inuse_idx] += val; 2056} 2057EXPORT_SYMBOL_GPL(sock_prot_inuse_add); 2058 2059int sock_prot_inuse_get(struct net *net, struct proto *prot) 2060{ 2061 int cpu, idx = prot->inuse_idx; 2062 int res = 0; 2063 2064 for_each_possible_cpu(cpu) 2065 res += per_cpu(prot_inuse, cpu).val[idx]; 2066 2067 return res >= 0 ? res : 0; 2068} 2069EXPORT_SYMBOL_GPL(sock_prot_inuse_get); 2070#endif 2071 2072static void assign_proto_idx(struct proto *prot) 2073{ 2074 prot->inuse_idx = find_first_zero_bit(proto_inuse_idx, PROTO_INUSE_NR); 2075 2076 if (unlikely(prot->inuse_idx == PROTO_INUSE_NR - 1)) { 2077 printk(KERN_ERR "PROTO_INUSE_NR exhausted\n"); 2078 return; 2079 } 2080 2081 set_bit(prot->inuse_idx, proto_inuse_idx); 2082} 2083 2084static void release_proto_idx(struct proto *prot) 2085{ 2086 if (prot->inuse_idx != PROTO_INUSE_NR - 1) 2087 clear_bit(prot->inuse_idx, proto_inuse_idx); 2088} 2089#else 2090static inline void assign_proto_idx(struct proto *prot) 2091{ 2092} 2093 2094static inline void release_proto_idx(struct proto *prot) 2095{ 2096} 2097#endif 2098 2099int proto_register(struct proto *prot, int alloc_slab) 2100{ 2101 if (alloc_slab) { 2102 prot->slab = kmem_cache_create(prot->name, prot->obj_size, 0, 2103 SLAB_HWCACHE_ALIGN | prot->slab_flags, 2104 NULL); 2105 2106 if (prot->slab == NULL) { 2107 printk(KERN_CRIT "%s: Can't create sock SLAB cache!\n", 2108 prot->name); 2109 goto out; 2110 } 2111 2112 if (prot->rsk_prot != NULL) { 2113 static const char mask[] = "request_sock_%s"; 2114 2115 prot->rsk_prot->slab_name = kmalloc(strlen(prot->name) + sizeof(mask) - 1, GFP_KERNEL); 2116 if (prot->rsk_prot->slab_name == NULL) 2117 goto out_free_sock_slab; 2118 2119 sprintf(prot->rsk_prot->slab_name, mask, prot->name); 2120 prot->rsk_prot->slab = kmem_cache_create(prot->rsk_prot->slab_name, 2121 prot->rsk_prot->obj_size, 0, 2122 SLAB_HWCACHE_ALIGN, NULL); 2123 2124 if (prot->rsk_prot->slab == NULL) { 2125 printk(KERN_CRIT "%s: Can't create request sock SLAB cache!\n", 2126 prot->name); 2127 goto out_free_request_sock_slab_name; 2128 } 2129 } 2130 2131 if (prot->twsk_prot != NULL) { 2132 static const char mask[] = "tw_sock_%s"; 2133 2134 prot->twsk_prot->twsk_slab_name = kmalloc(strlen(prot->name) + sizeof(mask) - 1, GFP_KERNEL); 2135 2136 if (prot->twsk_prot->twsk_slab_name == NULL) 2137 goto out_free_request_sock_slab; 2138 2139 sprintf(prot->twsk_prot->twsk_slab_name, mask, prot->name); 2140 prot->twsk_prot->twsk_slab = 2141 kmem_cache_create(prot->twsk_prot->twsk_slab_name, 2142 prot->twsk_prot->twsk_obj_size, 2143 0, 2144 SLAB_HWCACHE_ALIGN | 2145 prot->slab_flags, 2146 NULL); 2147 if (prot->twsk_prot->twsk_slab == NULL) 2148 goto out_free_timewait_sock_slab_name; 2149 } 2150 } 2151 2152 write_lock(&proto_list_lock); 2153 list_add(&prot->node, &proto_list); 2154 assign_proto_idx(prot); 2155 write_unlock(&proto_list_lock); 2156 return 0; 2157 2158out_free_timewait_sock_slab_name: 2159 kfree(prot->twsk_prot->twsk_slab_name); 2160out_free_request_sock_slab: 2161 if (prot->rsk_prot && prot->rsk_prot->slab) { 2162 kmem_cache_destroy(prot->rsk_prot->slab); 2163 prot->rsk_prot->slab = NULL; 2164 } 2165out_free_request_sock_slab_name: 2166 kfree(prot->rsk_prot->slab_name); 2167out_free_sock_slab: 2168 kmem_cache_destroy(prot->slab); 2169 prot->slab = NULL; 2170out: 2171 return -ENOBUFS; 2172} 2173 2174EXPORT_SYMBOL(proto_register); 2175 2176void proto_unregister(struct proto *prot) 2177{ 2178 write_lock(&proto_list_lock); 2179 release_proto_idx(prot); 2180 list_del(&prot->node); 2181 write_unlock(&proto_list_lock); 2182 2183 if (prot->slab != NULL) { 2184 kmem_cache_destroy(prot->slab); 2185 prot->slab = NULL; 2186 } 2187 2188 if (prot->rsk_prot != NULL && prot->rsk_prot->slab != NULL) { 2189 kmem_cache_destroy(prot->rsk_prot->slab); 2190 kfree(prot->rsk_prot->slab_name); 2191 prot->rsk_prot->slab = NULL; 2192 } 2193 2194 if (prot->twsk_prot != NULL && prot->twsk_prot->twsk_slab != NULL) { 2195 kmem_cache_destroy(prot->twsk_prot->twsk_slab); 2196 kfree(prot->twsk_prot->twsk_slab_name); 2197 prot->twsk_prot->twsk_slab = NULL; 2198 } 2199} 2200 2201EXPORT_SYMBOL(proto_unregister); 2202 2203#ifdef CONFIG_PROC_FS 2204static void *proto_seq_start(struct seq_file *seq, loff_t *pos) 2205 __acquires(proto_list_lock) 2206{ 2207 read_lock(&proto_list_lock); 2208 return seq_list_start_head(&proto_list, *pos); 2209} 2210 2211static void *proto_seq_next(struct seq_file *seq, void *v, loff_t *pos) 2212{ 2213 return seq_list_next(v, &proto_list, pos); 2214} 2215 2216static void proto_seq_stop(struct seq_file *seq, void *v) 2217 __releases(proto_list_lock) 2218{ 2219 read_unlock(&proto_list_lock); 2220} 2221 2222static char proto_method_implemented(const void *method) 2223{ 2224 return method == NULL ? 'n' : 'y'; 2225} 2226 2227static void proto_seq_printf(struct seq_file *seq, struct proto *proto) 2228{ 2229 seq_printf(seq, "%-9s %4u %6d %6d %-3s %6u %-3s %-10s " 2230 "%2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c\n", 2231 proto->name, 2232 proto->obj_size, 2233 sock_prot_inuse_get(seq_file_net(seq), proto), 2234 proto->memory_allocated != NULL ? atomic_read(proto->memory_allocated) : -1, 2235 proto->memory_pressure != NULL ? *proto->memory_pressure ? "yes" : "no" : "NI", 2236 proto->max_header, 2237 proto->slab == NULL ? "no" : "yes", 2238 module_name(proto->owner), 2239 proto_method_implemented(proto->close), 2240 proto_method_implemented(proto->connect), 2241 proto_method_implemented(proto->disconnect), 2242 proto_method_implemented(proto->accept), 2243 proto_method_implemented(proto->ioctl), 2244 proto_method_implemented(proto->init), 2245 proto_method_implemented(proto->destroy), 2246 proto_method_implemented(proto->shutdown), 2247 proto_method_implemented(proto->setsockopt), 2248 proto_method_implemented(proto->getsockopt), 2249 proto_method_implemented(proto->sendmsg), 2250 proto_method_implemented(proto->recvmsg), 2251 proto_method_implemented(proto->sendpage), 2252 proto_method_implemented(proto->bind), 2253 proto_method_implemented(proto->backlog_rcv), 2254 proto_method_implemented(proto->hash), 2255 proto_method_implemented(proto->unhash), 2256 proto_method_implemented(proto->get_port), 2257 proto_method_implemented(proto->enter_memory_pressure)); 2258} 2259 2260static int proto_seq_show(struct seq_file *seq, void *v) 2261{ 2262 if (v == &proto_list) 2263 seq_printf(seq, "%-9s %-4s %-8s %-6s %-5s %-7s %-4s %-10s %s", 2264 "protocol", 2265 "size", 2266 "sockets", 2267 "memory", 2268 "press", 2269 "maxhdr", 2270 "slab", 2271 "module", 2272 "cl co di ac io in de sh ss gs se re sp bi br ha uh gp em\n"); 2273 else 2274 proto_seq_printf(seq, list_entry(v, struct proto, node)); 2275 return 0; 2276} 2277 2278static const struct seq_operations proto_seq_ops = { 2279 .start = proto_seq_start, 2280 .next = proto_seq_next, 2281 .stop = proto_seq_stop, 2282 .show = proto_seq_show, 2283}; 2284 2285static int proto_seq_open(struct inode *inode, struct file *file) 2286{ 2287 return seq_open_net(inode, file, &proto_seq_ops, 2288 sizeof(struct seq_net_private)); 2289} 2290 2291static const struct file_operations proto_seq_fops = { 2292 .owner = THIS_MODULE, 2293 .open = proto_seq_open, 2294 .read = seq_read, 2295 .llseek = seq_lseek, 2296 .release = seq_release_net, 2297}; 2298 2299static __net_init int proto_init_net(struct net *net) 2300{ 2301 if (!proc_net_fops_create(net, "protocols", S_IRUGO, &proto_seq_fops)) 2302 return -ENOMEM; 2303 2304 return 0; 2305} 2306 2307static __net_exit void proto_exit_net(struct net *net) 2308{ 2309 proc_net_remove(net, "protocols"); 2310} 2311 2312 2313static __net_initdata struct pernet_operations proto_net_ops = { 2314 .init = proto_init_net, 2315 .exit = proto_exit_net, 2316}; 2317 2318static int __init proto_init(void) 2319{ 2320 return register_pernet_subsys(&proto_net_ops); 2321} 2322 2323subsys_initcall(proto_init); 2324 2325#endif /* PROC_FS */ 2326 2327EXPORT_SYMBOL(sk_alloc); 2328EXPORT_SYMBOL(sk_free); 2329EXPORT_SYMBOL(sk_send_sigurg); 2330EXPORT_SYMBOL(sock_alloc_send_skb); 2331EXPORT_SYMBOL(sock_init_data); 2332EXPORT_SYMBOL(sock_kfree_s); 2333EXPORT_SYMBOL(sock_kmalloc); 2334EXPORT_SYMBOL(sock_no_accept); 2335EXPORT_SYMBOL(sock_no_bind); 2336EXPORT_SYMBOL(sock_no_connect); 2337EXPORT_SYMBOL(sock_no_getname); 2338EXPORT_SYMBOL(sock_no_getsockopt); 2339EXPORT_SYMBOL(sock_no_ioctl); 2340EXPORT_SYMBOL(sock_no_listen); 2341EXPORT_SYMBOL(sock_no_mmap); 2342EXPORT_SYMBOL(sock_no_poll); 2343EXPORT_SYMBOL(sock_no_recvmsg); 2344EXPORT_SYMBOL(sock_no_sendmsg); 2345EXPORT_SYMBOL(sock_no_sendpage); 2346EXPORT_SYMBOL(sock_no_setsockopt); 2347EXPORT_SYMBOL(sock_no_shutdown); 2348EXPORT_SYMBOL(sock_no_socketpair); 2349EXPORT_SYMBOL(sock_rfree); 2350EXPORT_SYMBOL(sock_setsockopt); 2351EXPORT_SYMBOL(sock_wfree); 2352EXPORT_SYMBOL(sock_wmalloc); 2353EXPORT_SYMBOL(sock_i_uid); 2354EXPORT_SYMBOL(sock_i_ino); 2355EXPORT_SYMBOL(sysctl_optmem_max); 2356