sock.c revision df0bca049d01c0ee94afb7cd5dfd959541e6c8da
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 <net/xfrm.h> 124#include <linux/ipsec.h> 125 126#include <linux/filter.h> 127 128#ifdef CONFIG_INET 129#include <net/tcp.h> 130#endif 131 132/* 133 * Each address family might have different locking rules, so we have 134 * one slock key per address family: 135 */ 136static struct lock_class_key af_family_keys[AF_MAX]; 137static struct lock_class_key af_family_slock_keys[AF_MAX]; 138 139/* 140 * Make lock validator output more readable. (we pre-construct these 141 * strings build-time, so that runtime initialization of socket 142 * locks is fast): 143 */ 144static const char *af_family_key_strings[AF_MAX+1] = { 145 "sk_lock-AF_UNSPEC", "sk_lock-AF_UNIX" , "sk_lock-AF_INET" , 146 "sk_lock-AF_AX25" , "sk_lock-AF_IPX" , "sk_lock-AF_APPLETALK", 147 "sk_lock-AF_NETROM", "sk_lock-AF_BRIDGE" , "sk_lock-AF_ATMPVC" , 148 "sk_lock-AF_X25" , "sk_lock-AF_INET6" , "sk_lock-AF_ROSE" , 149 "sk_lock-AF_DECnet", "sk_lock-AF_NETBEUI" , "sk_lock-AF_SECURITY" , 150 "sk_lock-AF_KEY" , "sk_lock-AF_NETLINK" , "sk_lock-AF_PACKET" , 151 "sk_lock-AF_ASH" , "sk_lock-AF_ECONET" , "sk_lock-AF_ATMSVC" , 152 "sk_lock-21" , "sk_lock-AF_SNA" , "sk_lock-AF_IRDA" , 153 "sk_lock-AF_PPPOX" , "sk_lock-AF_WANPIPE" , "sk_lock-AF_LLC" , 154 "sk_lock-27" , "sk_lock-28" , "sk_lock-AF_CAN" , 155 "sk_lock-AF_TIPC" , "sk_lock-AF_BLUETOOTH", "sk_lock-IUCV" , 156 "sk_lock-AF_RXRPC" , "sk_lock-AF_ISDN" , "sk_lock-AF_PHONET" , 157 "sk_lock-AF_MAX" 158}; 159static const char *af_family_slock_key_strings[AF_MAX+1] = { 160 "slock-AF_UNSPEC", "slock-AF_UNIX" , "slock-AF_INET" , 161 "slock-AF_AX25" , "slock-AF_IPX" , "slock-AF_APPLETALK", 162 "slock-AF_NETROM", "slock-AF_BRIDGE" , "slock-AF_ATMPVC" , 163 "slock-AF_X25" , "slock-AF_INET6" , "slock-AF_ROSE" , 164 "slock-AF_DECnet", "slock-AF_NETBEUI" , "slock-AF_SECURITY" , 165 "slock-AF_KEY" , "slock-AF_NETLINK" , "slock-AF_PACKET" , 166 "slock-AF_ASH" , "slock-AF_ECONET" , "slock-AF_ATMSVC" , 167 "slock-21" , "slock-AF_SNA" , "slock-AF_IRDA" , 168 "slock-AF_PPPOX" , "slock-AF_WANPIPE" , "slock-AF_LLC" , 169 "slock-27" , "slock-28" , "slock-AF_CAN" , 170 "slock-AF_TIPC" , "slock-AF_BLUETOOTH", "slock-AF_IUCV" , 171 "slock-AF_RXRPC" , "slock-AF_ISDN" , "slock-AF_PHONET" , 172 "slock-AF_MAX" 173}; 174static const char *af_family_clock_key_strings[AF_MAX+1] = { 175 "clock-AF_UNSPEC", "clock-AF_UNIX" , "clock-AF_INET" , 176 "clock-AF_AX25" , "clock-AF_IPX" , "clock-AF_APPLETALK", 177 "clock-AF_NETROM", "clock-AF_BRIDGE" , "clock-AF_ATMPVC" , 178 "clock-AF_X25" , "clock-AF_INET6" , "clock-AF_ROSE" , 179 "clock-AF_DECnet", "clock-AF_NETBEUI" , "clock-AF_SECURITY" , 180 "clock-AF_KEY" , "clock-AF_NETLINK" , "clock-AF_PACKET" , 181 "clock-AF_ASH" , "clock-AF_ECONET" , "clock-AF_ATMSVC" , 182 "clock-21" , "clock-AF_SNA" , "clock-AF_IRDA" , 183 "clock-AF_PPPOX" , "clock-AF_WANPIPE" , "clock-AF_LLC" , 184 "clock-27" , "clock-28" , "clock-AF_CAN" , 185 "clock-AF_TIPC" , "clock-AF_BLUETOOTH", "clock-AF_IUCV" , 186 "clock-AF_RXRPC" , "clock-AF_ISDN" , "clock-AF_PHONET" , 187 "clock-AF_MAX" 188}; 189 190/* 191 * sk_callback_lock locking rules are per-address-family, 192 * so split the lock classes by using a per-AF key: 193 */ 194static struct lock_class_key af_callback_keys[AF_MAX]; 195 196/* Take into consideration the size of the struct sk_buff overhead in the 197 * determination of these values, since that is non-constant across 198 * platforms. This makes socket queueing behavior and performance 199 * not depend upon such differences. 200 */ 201#define _SK_MEM_PACKETS 256 202#define _SK_MEM_OVERHEAD (sizeof(struct sk_buff) + 256) 203#define SK_WMEM_MAX (_SK_MEM_OVERHEAD * _SK_MEM_PACKETS) 204#define SK_RMEM_MAX (_SK_MEM_OVERHEAD * _SK_MEM_PACKETS) 205 206/* Run time adjustable parameters. */ 207__u32 sysctl_wmem_max __read_mostly = SK_WMEM_MAX; 208__u32 sysctl_rmem_max __read_mostly = SK_RMEM_MAX; 209__u32 sysctl_wmem_default __read_mostly = SK_WMEM_MAX; 210__u32 sysctl_rmem_default __read_mostly = SK_RMEM_MAX; 211 212/* Maximal space eaten by iovec or ancilliary data plus some space */ 213int sysctl_optmem_max __read_mostly = sizeof(unsigned long)*(2*UIO_MAXIOV+512); 214 215static int sock_set_timeout(long *timeo_p, char __user *optval, int optlen) 216{ 217 struct timeval tv; 218 219 if (optlen < sizeof(tv)) 220 return -EINVAL; 221 if (copy_from_user(&tv, optval, sizeof(tv))) 222 return -EFAULT; 223 if (tv.tv_usec < 0 || tv.tv_usec >= USEC_PER_SEC) 224 return -EDOM; 225 226 if (tv.tv_sec < 0) { 227 static int warned __read_mostly; 228 229 *timeo_p = 0; 230 if (warned < 10 && net_ratelimit()) { 231 warned++; 232 printk(KERN_INFO "sock_set_timeout: `%s' (pid %d) " 233 "tries to set negative timeout\n", 234 current->comm, task_pid_nr(current)); 235 } 236 return 0; 237 } 238 *timeo_p = MAX_SCHEDULE_TIMEOUT; 239 if (tv.tv_sec == 0 && tv.tv_usec == 0) 240 return 0; 241 if (tv.tv_sec < (MAX_SCHEDULE_TIMEOUT/HZ - 1)) 242 *timeo_p = tv.tv_sec*HZ + (tv.tv_usec+(1000000/HZ-1))/(1000000/HZ); 243 return 0; 244} 245 246static void sock_warn_obsolete_bsdism(const char *name) 247{ 248 static int warned; 249 static char warncomm[TASK_COMM_LEN]; 250 if (strcmp(warncomm, current->comm) && warned < 5) { 251 strcpy(warncomm, current->comm); 252 printk(KERN_WARNING "process `%s' is using obsolete " 253 "%s SO_BSDCOMPAT\n", warncomm, name); 254 warned++; 255 } 256} 257 258static void sock_disable_timestamp(struct sock *sk) 259{ 260 if (sock_flag(sk, SOCK_TIMESTAMP)) { 261 sock_reset_flag(sk, SOCK_TIMESTAMP); 262 net_disable_timestamp(); 263 } 264} 265 266 267int sock_queue_rcv_skb(struct sock *sk, struct sk_buff *skb) 268{ 269 int err = 0; 270 int skb_len; 271 272 /* Cast sk->rcvbuf to unsigned... It's pointless, but reduces 273 number of warnings when compiling with -W --ANK 274 */ 275 if (atomic_read(&sk->sk_rmem_alloc) + skb->truesize >= 276 (unsigned)sk->sk_rcvbuf) { 277 err = -ENOMEM; 278 goto out; 279 } 280 281 err = sk_filter(sk, skb); 282 if (err) 283 goto out; 284 285 if (!sk_rmem_schedule(sk, skb->truesize)) { 286 err = -ENOBUFS; 287 goto out; 288 } 289 290 skb->dev = NULL; 291 skb_set_owner_r(skb, sk); 292 293 /* Cache the SKB length before we tack it onto the receive 294 * queue. Once it is added it no longer belongs to us and 295 * may be freed by other threads of control pulling packets 296 * from the queue. 297 */ 298 skb_len = skb->len; 299 300 skb_queue_tail(&sk->sk_receive_queue, skb); 301 302 if (!sock_flag(sk, SOCK_DEAD)) 303 sk->sk_data_ready(sk, skb_len); 304out: 305 return err; 306} 307EXPORT_SYMBOL(sock_queue_rcv_skb); 308 309int sk_receive_skb(struct sock *sk, struct sk_buff *skb, const int nested) 310{ 311 int rc = NET_RX_SUCCESS; 312 313 if (sk_filter(sk, skb)) 314 goto discard_and_relse; 315 316 skb->dev = NULL; 317 318 if (nested) 319 bh_lock_sock_nested(sk); 320 else 321 bh_lock_sock(sk); 322 if (!sock_owned_by_user(sk)) { 323 /* 324 * trylock + unlock semantics: 325 */ 326 mutex_acquire(&sk->sk_lock.dep_map, 0, 1, _RET_IP_); 327 328 rc = sk_backlog_rcv(sk, skb); 329 330 mutex_release(&sk->sk_lock.dep_map, 1, _RET_IP_); 331 } else 332 sk_add_backlog(sk, skb); 333 bh_unlock_sock(sk); 334out: 335 sock_put(sk); 336 return rc; 337discard_and_relse: 338 kfree_skb(skb); 339 goto out; 340} 341EXPORT_SYMBOL(sk_receive_skb); 342 343struct dst_entry *__sk_dst_check(struct sock *sk, u32 cookie) 344{ 345 struct dst_entry *dst = sk->sk_dst_cache; 346 347 if (dst && dst->obsolete && dst->ops->check(dst, cookie) == NULL) { 348 sk->sk_dst_cache = NULL; 349 dst_release(dst); 350 return NULL; 351 } 352 353 return dst; 354} 355EXPORT_SYMBOL(__sk_dst_check); 356 357struct dst_entry *sk_dst_check(struct sock *sk, u32 cookie) 358{ 359 struct dst_entry *dst = sk_dst_get(sk); 360 361 if (dst && dst->obsolete && dst->ops->check(dst, cookie) == NULL) { 362 sk_dst_reset(sk); 363 dst_release(dst); 364 return NULL; 365 } 366 367 return dst; 368} 369EXPORT_SYMBOL(sk_dst_check); 370 371static int sock_bindtodevice(struct sock *sk, char __user *optval, int optlen) 372{ 373 int ret = -ENOPROTOOPT; 374#ifdef CONFIG_NETDEVICES 375 struct net *net = sock_net(sk); 376 char devname[IFNAMSIZ]; 377 int index; 378 379 /* Sorry... */ 380 ret = -EPERM; 381 if (!capable(CAP_NET_RAW)) 382 goto out; 383 384 ret = -EINVAL; 385 if (optlen < 0) 386 goto out; 387 388 /* Bind this socket to a particular device like "eth0", 389 * as specified in the passed interface name. If the 390 * name is "" or the option length is zero the socket 391 * is not bound. 392 */ 393 if (optlen > IFNAMSIZ - 1) 394 optlen = IFNAMSIZ - 1; 395 memset(devname, 0, sizeof(devname)); 396 397 ret = -EFAULT; 398 if (copy_from_user(devname, optval, optlen)) 399 goto out; 400 401 if (devname[0] == '\0') { 402 index = 0; 403 } else { 404 struct net_device *dev = dev_get_by_name(net, devname); 405 406 ret = -ENODEV; 407 if (!dev) 408 goto out; 409 410 index = dev->ifindex; 411 dev_put(dev); 412 } 413 414 lock_sock(sk); 415 sk->sk_bound_dev_if = index; 416 sk_dst_reset(sk); 417 release_sock(sk); 418 419 ret = 0; 420 421out: 422#endif 423 424 return ret; 425} 426 427static inline void sock_valbool_flag(struct sock *sk, int bit, int valbool) 428{ 429 if (valbool) 430 sock_set_flag(sk, bit); 431 else 432 sock_reset_flag(sk, bit); 433} 434 435/* 436 * This is meant for all protocols to use and covers goings on 437 * at the socket level. Everything here is generic. 438 */ 439 440int sock_setsockopt(struct socket *sock, int level, int optname, 441 char __user *optval, int optlen) 442{ 443 struct sock *sk=sock->sk; 444 int val; 445 int valbool; 446 struct linger ling; 447 int ret = 0; 448 449 /* 450 * Options without arguments 451 */ 452 453 if (optname == SO_BINDTODEVICE) 454 return sock_bindtodevice(sk, optval, optlen); 455 456 if (optlen < sizeof(int)) 457 return -EINVAL; 458 459 if (get_user(val, (int __user *)optval)) 460 return -EFAULT; 461 462 valbool = val?1:0; 463 464 lock_sock(sk); 465 466 switch(optname) { 467 case SO_DEBUG: 468 if (val && !capable(CAP_NET_ADMIN)) { 469 ret = -EACCES; 470 } else 471 sock_valbool_flag(sk, SOCK_DBG, valbool); 472 break; 473 case SO_REUSEADDR: 474 sk->sk_reuse = valbool; 475 break; 476 case SO_TYPE: 477 case SO_ERROR: 478 ret = -ENOPROTOOPT; 479 break; 480 case SO_DONTROUTE: 481 sock_valbool_flag(sk, SOCK_LOCALROUTE, valbool); 482 break; 483 case SO_BROADCAST: 484 sock_valbool_flag(sk, SOCK_BROADCAST, valbool); 485 break; 486 case SO_SNDBUF: 487 /* Don't error on this BSD doesn't and if you think 488 about it this is right. Otherwise apps have to 489 play 'guess the biggest size' games. RCVBUF/SNDBUF 490 are treated in BSD as hints */ 491 492 if (val > sysctl_wmem_max) 493 val = sysctl_wmem_max; 494set_sndbuf: 495 sk->sk_userlocks |= SOCK_SNDBUF_LOCK; 496 if ((val * 2) < SOCK_MIN_SNDBUF) 497 sk->sk_sndbuf = SOCK_MIN_SNDBUF; 498 else 499 sk->sk_sndbuf = val * 2; 500 501 /* 502 * Wake up sending tasks if we 503 * upped the value. 504 */ 505 sk->sk_write_space(sk); 506 break; 507 508 case SO_SNDBUFFORCE: 509 if (!capable(CAP_NET_ADMIN)) { 510 ret = -EPERM; 511 break; 512 } 513 goto set_sndbuf; 514 515 case SO_RCVBUF: 516 /* Don't error on this BSD doesn't and if you think 517 about it this is right. Otherwise apps have to 518 play 'guess the biggest size' games. RCVBUF/SNDBUF 519 are treated in BSD as hints */ 520 521 if (val > sysctl_rmem_max) 522 val = sysctl_rmem_max; 523set_rcvbuf: 524 sk->sk_userlocks |= SOCK_RCVBUF_LOCK; 525 /* 526 * We double it on the way in to account for 527 * "struct sk_buff" etc. overhead. Applications 528 * assume that the SO_RCVBUF setting they make will 529 * allow that much actual data to be received on that 530 * socket. 531 * 532 * Applications are unaware that "struct sk_buff" and 533 * other overheads allocate from the receive buffer 534 * during socket buffer allocation. 535 * 536 * And after considering the possible alternatives, 537 * returning the value we actually used in getsockopt 538 * is the most desirable behavior. 539 */ 540 if ((val * 2) < SOCK_MIN_RCVBUF) 541 sk->sk_rcvbuf = SOCK_MIN_RCVBUF; 542 else 543 sk->sk_rcvbuf = val * 2; 544 break; 545 546 case SO_RCVBUFFORCE: 547 if (!capable(CAP_NET_ADMIN)) { 548 ret = -EPERM; 549 break; 550 } 551 goto set_rcvbuf; 552 553 case SO_KEEPALIVE: 554#ifdef CONFIG_INET 555 if (sk->sk_protocol == IPPROTO_TCP) 556 tcp_set_keepalive(sk, valbool); 557#endif 558 sock_valbool_flag(sk, SOCK_KEEPOPEN, valbool); 559 break; 560 561 case SO_OOBINLINE: 562 sock_valbool_flag(sk, SOCK_URGINLINE, valbool); 563 break; 564 565 case SO_NO_CHECK: 566 sk->sk_no_check = valbool; 567 break; 568 569 case SO_PRIORITY: 570 if ((val >= 0 && val <= 6) || capable(CAP_NET_ADMIN)) 571 sk->sk_priority = val; 572 else 573 ret = -EPERM; 574 break; 575 576 case SO_LINGER: 577 if (optlen < sizeof(ling)) { 578 ret = -EINVAL; /* 1003.1g */ 579 break; 580 } 581 if (copy_from_user(&ling,optval,sizeof(ling))) { 582 ret = -EFAULT; 583 break; 584 } 585 if (!ling.l_onoff) 586 sock_reset_flag(sk, SOCK_LINGER); 587 else { 588#if (BITS_PER_LONG == 32) 589 if ((unsigned int)ling.l_linger >= MAX_SCHEDULE_TIMEOUT/HZ) 590 sk->sk_lingertime = MAX_SCHEDULE_TIMEOUT; 591 else 592#endif 593 sk->sk_lingertime = (unsigned int)ling.l_linger * HZ; 594 sock_set_flag(sk, SOCK_LINGER); 595 } 596 break; 597 598 case SO_BSDCOMPAT: 599 sock_warn_obsolete_bsdism("setsockopt"); 600 break; 601 602 case SO_PASSCRED: 603 if (valbool) 604 set_bit(SOCK_PASSCRED, &sock->flags); 605 else 606 clear_bit(SOCK_PASSCRED, &sock->flags); 607 break; 608 609 case SO_TIMESTAMP: 610 case SO_TIMESTAMPNS: 611 if (valbool) { 612 if (optname == SO_TIMESTAMP) 613 sock_reset_flag(sk, SOCK_RCVTSTAMPNS); 614 else 615 sock_set_flag(sk, SOCK_RCVTSTAMPNS); 616 sock_set_flag(sk, SOCK_RCVTSTAMP); 617 sock_enable_timestamp(sk); 618 } else { 619 sock_reset_flag(sk, SOCK_RCVTSTAMP); 620 sock_reset_flag(sk, SOCK_RCVTSTAMPNS); 621 } 622 break; 623 624 case SO_RCVLOWAT: 625 if (val < 0) 626 val = INT_MAX; 627 sk->sk_rcvlowat = val ? : 1; 628 break; 629 630 case SO_RCVTIMEO: 631 ret = sock_set_timeout(&sk->sk_rcvtimeo, optval, optlen); 632 break; 633 634 case SO_SNDTIMEO: 635 ret = sock_set_timeout(&sk->sk_sndtimeo, optval, optlen); 636 break; 637 638 case SO_ATTACH_FILTER: 639 ret = -EINVAL; 640 if (optlen == sizeof(struct sock_fprog)) { 641 struct sock_fprog fprog; 642 643 ret = -EFAULT; 644 if (copy_from_user(&fprog, optval, sizeof(fprog))) 645 break; 646 647 ret = sk_attach_filter(&fprog, sk); 648 } 649 break; 650 651 case SO_DETACH_FILTER: 652 ret = sk_detach_filter(sk); 653 break; 654 655 case SO_PASSSEC: 656 if (valbool) 657 set_bit(SOCK_PASSSEC, &sock->flags); 658 else 659 clear_bit(SOCK_PASSSEC, &sock->flags); 660 break; 661 case SO_MARK: 662 if (!capable(CAP_NET_ADMIN)) 663 ret = -EPERM; 664 else { 665 sk->sk_mark = val; 666 } 667 break; 668 669 /* We implement the SO_SNDLOWAT etc to 670 not be settable (1003.1g 5.3) */ 671 default: 672 ret = -ENOPROTOOPT; 673 break; 674 } 675 release_sock(sk); 676 return ret; 677} 678 679 680int sock_getsockopt(struct socket *sock, int level, int optname, 681 char __user *optval, int __user *optlen) 682{ 683 struct sock *sk = sock->sk; 684 685 union { 686 int val; 687 struct linger ling; 688 struct timeval tm; 689 } v; 690 691 unsigned int lv = sizeof(int); 692 int len; 693 694 if (get_user(len, optlen)) 695 return -EFAULT; 696 if (len < 0) 697 return -EINVAL; 698 699 v.val = 0; 700 701 switch(optname) { 702 case SO_DEBUG: 703 v.val = sock_flag(sk, SOCK_DBG); 704 break; 705 706 case SO_DONTROUTE: 707 v.val = sock_flag(sk, SOCK_LOCALROUTE); 708 break; 709 710 case SO_BROADCAST: 711 v.val = !!sock_flag(sk, SOCK_BROADCAST); 712 break; 713 714 case SO_SNDBUF: 715 v.val = sk->sk_sndbuf; 716 break; 717 718 case SO_RCVBUF: 719 v.val = sk->sk_rcvbuf; 720 break; 721 722 case SO_REUSEADDR: 723 v.val = sk->sk_reuse; 724 break; 725 726 case SO_KEEPALIVE: 727 v.val = !!sock_flag(sk, SOCK_KEEPOPEN); 728 break; 729 730 case SO_TYPE: 731 v.val = sk->sk_type; 732 break; 733 734 case SO_ERROR: 735 v.val = -sock_error(sk); 736 if (v.val==0) 737 v.val = xchg(&sk->sk_err_soft, 0); 738 break; 739 740 case SO_OOBINLINE: 741 v.val = !!sock_flag(sk, SOCK_URGINLINE); 742 break; 743 744 case SO_NO_CHECK: 745 v.val = sk->sk_no_check; 746 break; 747 748 case SO_PRIORITY: 749 v.val = sk->sk_priority; 750 break; 751 752 case SO_LINGER: 753 lv = sizeof(v.ling); 754 v.ling.l_onoff = !!sock_flag(sk, SOCK_LINGER); 755 v.ling.l_linger = sk->sk_lingertime / HZ; 756 break; 757 758 case SO_BSDCOMPAT: 759 sock_warn_obsolete_bsdism("getsockopt"); 760 break; 761 762 case SO_TIMESTAMP: 763 v.val = sock_flag(sk, SOCK_RCVTSTAMP) && 764 !sock_flag(sk, SOCK_RCVTSTAMPNS); 765 break; 766 767 case SO_TIMESTAMPNS: 768 v.val = sock_flag(sk, SOCK_RCVTSTAMPNS); 769 break; 770 771 case SO_RCVTIMEO: 772 lv=sizeof(struct timeval); 773 if (sk->sk_rcvtimeo == MAX_SCHEDULE_TIMEOUT) { 774 v.tm.tv_sec = 0; 775 v.tm.tv_usec = 0; 776 } else { 777 v.tm.tv_sec = sk->sk_rcvtimeo / HZ; 778 v.tm.tv_usec = ((sk->sk_rcvtimeo % HZ) * 1000000) / HZ; 779 } 780 break; 781 782 case SO_SNDTIMEO: 783 lv=sizeof(struct timeval); 784 if (sk->sk_sndtimeo == MAX_SCHEDULE_TIMEOUT) { 785 v.tm.tv_sec = 0; 786 v.tm.tv_usec = 0; 787 } else { 788 v.tm.tv_sec = sk->sk_sndtimeo / HZ; 789 v.tm.tv_usec = ((sk->sk_sndtimeo % HZ) * 1000000) / HZ; 790 } 791 break; 792 793 case SO_RCVLOWAT: 794 v.val = sk->sk_rcvlowat; 795 break; 796 797 case SO_SNDLOWAT: 798 v.val=1; 799 break; 800 801 case SO_PASSCRED: 802 v.val = test_bit(SOCK_PASSCRED, &sock->flags) ? 1 : 0; 803 break; 804 805 case SO_PEERCRED: 806 if (len > sizeof(sk->sk_peercred)) 807 len = sizeof(sk->sk_peercred); 808 if (copy_to_user(optval, &sk->sk_peercred, len)) 809 return -EFAULT; 810 goto lenout; 811 812 case SO_PEERNAME: 813 { 814 char address[128]; 815 816 if (sock->ops->getname(sock, (struct sockaddr *)address, &lv, 2)) 817 return -ENOTCONN; 818 if (lv < len) 819 return -EINVAL; 820 if (copy_to_user(optval, address, len)) 821 return -EFAULT; 822 goto lenout; 823 } 824 825 /* Dubious BSD thing... Probably nobody even uses it, but 826 * the UNIX standard wants it for whatever reason... -DaveM 827 */ 828 case SO_ACCEPTCONN: 829 v.val = sk->sk_state == TCP_LISTEN; 830 break; 831 832 case SO_PASSSEC: 833 v.val = test_bit(SOCK_PASSSEC, &sock->flags) ? 1 : 0; 834 break; 835 836 case SO_PEERSEC: 837 return security_socket_getpeersec_stream(sock, optval, optlen, len); 838 839 case SO_MARK: 840 v.val = sk->sk_mark; 841 break; 842 843 default: 844 return -ENOPROTOOPT; 845 } 846 847 if (len > lv) 848 len = lv; 849 if (copy_to_user(optval, &v, len)) 850 return -EFAULT; 851lenout: 852 if (put_user(len, optlen)) 853 return -EFAULT; 854 return 0; 855} 856 857/* 858 * Initialize an sk_lock. 859 * 860 * (We also register the sk_lock with the lock validator.) 861 */ 862static inline void sock_lock_init(struct sock *sk) 863{ 864 sock_lock_init_class_and_name(sk, 865 af_family_slock_key_strings[sk->sk_family], 866 af_family_slock_keys + sk->sk_family, 867 af_family_key_strings[sk->sk_family], 868 af_family_keys + sk->sk_family); 869} 870 871static void sock_copy(struct sock *nsk, const struct sock *osk) 872{ 873#ifdef CONFIG_SECURITY_NETWORK 874 void *sptr = nsk->sk_security; 875#endif 876 877 memcpy(nsk, osk, osk->sk_prot->obj_size); 878#ifdef CONFIG_SECURITY_NETWORK 879 nsk->sk_security = sptr; 880 security_sk_clone(osk, nsk); 881#endif 882} 883 884static struct sock *sk_prot_alloc(struct proto *prot, gfp_t priority, 885 int family) 886{ 887 struct sock *sk; 888 struct kmem_cache *slab; 889 890 slab = prot->slab; 891 if (slab != NULL) 892 sk = kmem_cache_alloc(slab, priority); 893 else 894 sk = kmalloc(prot->obj_size, priority); 895 896 if (sk != NULL) { 897 if (security_sk_alloc(sk, family, priority)) 898 goto out_free; 899 900 if (!try_module_get(prot->owner)) 901 goto out_free_sec; 902 } 903 904 return sk; 905 906out_free_sec: 907 security_sk_free(sk); 908out_free: 909 if (slab != NULL) 910 kmem_cache_free(slab, sk); 911 else 912 kfree(sk); 913 return NULL; 914} 915 916static void sk_prot_free(struct proto *prot, struct sock *sk) 917{ 918 struct kmem_cache *slab; 919 struct module *owner; 920 921 owner = prot->owner; 922 slab = prot->slab; 923 924 security_sk_free(sk); 925 if (slab != NULL) 926 kmem_cache_free(slab, sk); 927 else 928 kfree(sk); 929 module_put(owner); 930} 931 932/** 933 * sk_alloc - All socket objects are allocated here 934 * @net: the applicable net namespace 935 * @family: protocol family 936 * @priority: for allocation (%GFP_KERNEL, %GFP_ATOMIC, etc) 937 * @prot: struct proto associated with this new sock instance 938 */ 939struct sock *sk_alloc(struct net *net, int family, gfp_t priority, 940 struct proto *prot) 941{ 942 struct sock *sk; 943 944 sk = sk_prot_alloc(prot, priority | __GFP_ZERO, family); 945 if (sk) { 946 sk->sk_family = family; 947 /* 948 * See comment in struct sock definition to understand 949 * why we need sk_prot_creator -acme 950 */ 951 sk->sk_prot = sk->sk_prot_creator = prot; 952 sock_lock_init(sk); 953 sock_net_set(sk, get_net(net)); 954 } 955 956 return sk; 957} 958 959void sk_free(struct sock *sk) 960{ 961 struct sk_filter *filter; 962 963 if (sk->sk_destruct) 964 sk->sk_destruct(sk); 965 966 filter = rcu_dereference(sk->sk_filter); 967 if (filter) { 968 sk_filter_uncharge(sk, filter); 969 rcu_assign_pointer(sk->sk_filter, NULL); 970 } 971 972 sock_disable_timestamp(sk); 973 974 if (atomic_read(&sk->sk_omem_alloc)) 975 printk(KERN_DEBUG "%s: optmem leakage (%d bytes) detected.\n", 976 __func__, atomic_read(&sk->sk_omem_alloc)); 977 978 put_net(sock_net(sk)); 979 sk_prot_free(sk->sk_prot_creator, sk); 980} 981 982/* 983 * Last sock_put should drop referrence to sk->sk_net. It has already 984 * been dropped in sk_change_net. Taking referrence to stopping namespace 985 * is not an option. 986 * Take referrence to a socket to remove it from hash _alive_ and after that 987 * destroy it in the context of init_net. 988 */ 989void sk_release_kernel(struct sock *sk) 990{ 991 if (sk == NULL || sk->sk_socket == NULL) 992 return; 993 994 sock_hold(sk); 995 sock_release(sk->sk_socket); 996 release_net(sock_net(sk)); 997 sock_net_set(sk, get_net(&init_net)); 998 sock_put(sk); 999} 1000EXPORT_SYMBOL(sk_release_kernel); 1001 1002struct sock *sk_clone(const struct sock *sk, const gfp_t priority) 1003{ 1004 struct sock *newsk; 1005 1006 newsk = sk_prot_alloc(sk->sk_prot, priority, sk->sk_family); 1007 if (newsk != NULL) { 1008 struct sk_filter *filter; 1009 1010 sock_copy(newsk, sk); 1011 1012 /* SANITY */ 1013 get_net(sock_net(newsk)); 1014 sk_node_init(&newsk->sk_node); 1015 sock_lock_init(newsk); 1016 bh_lock_sock(newsk); 1017 newsk->sk_backlog.head = newsk->sk_backlog.tail = NULL; 1018 1019 atomic_set(&newsk->sk_rmem_alloc, 0); 1020 atomic_set(&newsk->sk_wmem_alloc, 0); 1021 atomic_set(&newsk->sk_omem_alloc, 0); 1022 skb_queue_head_init(&newsk->sk_receive_queue); 1023 skb_queue_head_init(&newsk->sk_write_queue); 1024#ifdef CONFIG_NET_DMA 1025 skb_queue_head_init(&newsk->sk_async_wait_queue); 1026#endif 1027 1028 rwlock_init(&newsk->sk_dst_lock); 1029 rwlock_init(&newsk->sk_callback_lock); 1030 lockdep_set_class_and_name(&newsk->sk_callback_lock, 1031 af_callback_keys + newsk->sk_family, 1032 af_family_clock_key_strings[newsk->sk_family]); 1033 1034 newsk->sk_dst_cache = NULL; 1035 newsk->sk_wmem_queued = 0; 1036 newsk->sk_forward_alloc = 0; 1037 newsk->sk_send_head = NULL; 1038 newsk->sk_userlocks = sk->sk_userlocks & ~SOCK_BINDPORT_LOCK; 1039 1040 sock_reset_flag(newsk, SOCK_DONE); 1041 skb_queue_head_init(&newsk->sk_error_queue); 1042 1043 filter = newsk->sk_filter; 1044 if (filter != NULL) 1045 sk_filter_charge(newsk, filter); 1046 1047 if (unlikely(xfrm_sk_clone_policy(newsk))) { 1048 /* It is still raw copy of parent, so invalidate 1049 * destructor and make plain sk_free() */ 1050 newsk->sk_destruct = NULL; 1051 sk_free(newsk); 1052 newsk = NULL; 1053 goto out; 1054 } 1055 1056 newsk->sk_err = 0; 1057 newsk->sk_priority = 0; 1058 atomic_set(&newsk->sk_refcnt, 2); 1059 1060 /* 1061 * Increment the counter in the same struct proto as the master 1062 * sock (sk_refcnt_debug_inc uses newsk->sk_prot->socks, that 1063 * is the same as sk->sk_prot->socks, as this field was copied 1064 * with memcpy). 1065 * 1066 * This _changes_ the previous behaviour, where 1067 * tcp_create_openreq_child always was incrementing the 1068 * equivalent to tcp_prot->socks (inet_sock_nr), so this have 1069 * to be taken into account in all callers. -acme 1070 */ 1071 sk_refcnt_debug_inc(newsk); 1072 sk_set_socket(newsk, NULL); 1073 newsk->sk_sleep = NULL; 1074 1075 if (newsk->sk_prot->sockets_allocated) 1076 percpu_counter_inc(newsk->sk_prot->sockets_allocated); 1077 } 1078out: 1079 return newsk; 1080} 1081 1082EXPORT_SYMBOL_GPL(sk_clone); 1083 1084void sk_setup_caps(struct sock *sk, struct dst_entry *dst) 1085{ 1086 __sk_dst_set(sk, dst); 1087 sk->sk_route_caps = dst->dev->features; 1088 if (sk->sk_route_caps & NETIF_F_GSO) 1089 sk->sk_route_caps |= NETIF_F_GSO_SOFTWARE; 1090 if (sk_can_gso(sk)) { 1091 if (dst->header_len) { 1092 sk->sk_route_caps &= ~NETIF_F_GSO_MASK; 1093 } else { 1094 sk->sk_route_caps |= NETIF_F_SG | NETIF_F_HW_CSUM; 1095 sk->sk_gso_max_size = dst->dev->gso_max_size; 1096 } 1097 } 1098} 1099EXPORT_SYMBOL_GPL(sk_setup_caps); 1100 1101void __init sk_init(void) 1102{ 1103 if (num_physpages <= 4096) { 1104 sysctl_wmem_max = 32767; 1105 sysctl_rmem_max = 32767; 1106 sysctl_wmem_default = 32767; 1107 sysctl_rmem_default = 32767; 1108 } else if (num_physpages >= 131072) { 1109 sysctl_wmem_max = 131071; 1110 sysctl_rmem_max = 131071; 1111 } 1112} 1113 1114/* 1115 * Simple resource managers for sockets. 1116 */ 1117 1118 1119/* 1120 * Write buffer destructor automatically called from kfree_skb. 1121 */ 1122void sock_wfree(struct sk_buff *skb) 1123{ 1124 struct sock *sk = skb->sk; 1125 1126 /* In case it might be waiting for more memory. */ 1127 atomic_sub(skb->truesize, &sk->sk_wmem_alloc); 1128 if (!sock_flag(sk, SOCK_USE_WRITE_QUEUE)) 1129 sk->sk_write_space(sk); 1130 sock_put(sk); 1131} 1132 1133/* 1134 * Read buffer destructor automatically called from kfree_skb. 1135 */ 1136void sock_rfree(struct sk_buff *skb) 1137{ 1138 struct sock *sk = skb->sk; 1139 1140 skb_truesize_check(skb); 1141 atomic_sub(skb->truesize, &sk->sk_rmem_alloc); 1142 sk_mem_uncharge(skb->sk, skb->truesize); 1143} 1144 1145 1146int sock_i_uid(struct sock *sk) 1147{ 1148 int uid; 1149 1150 read_lock(&sk->sk_callback_lock); 1151 uid = sk->sk_socket ? SOCK_INODE(sk->sk_socket)->i_uid : 0; 1152 read_unlock(&sk->sk_callback_lock); 1153 return uid; 1154} 1155 1156unsigned long sock_i_ino(struct sock *sk) 1157{ 1158 unsigned long ino; 1159 1160 read_lock(&sk->sk_callback_lock); 1161 ino = sk->sk_socket ? SOCK_INODE(sk->sk_socket)->i_ino : 0; 1162 read_unlock(&sk->sk_callback_lock); 1163 return ino; 1164} 1165 1166/* 1167 * Allocate a skb from the socket's send buffer. 1168 */ 1169struct sk_buff *sock_wmalloc(struct sock *sk, unsigned long size, int force, 1170 gfp_t priority) 1171{ 1172 if (force || atomic_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf) { 1173 struct sk_buff * skb = alloc_skb(size, priority); 1174 if (skb) { 1175 skb_set_owner_w(skb, sk); 1176 return skb; 1177 } 1178 } 1179 return NULL; 1180} 1181 1182/* 1183 * Allocate a skb from the socket's receive buffer. 1184 */ 1185struct sk_buff *sock_rmalloc(struct sock *sk, unsigned long size, int force, 1186 gfp_t priority) 1187{ 1188 if (force || atomic_read(&sk->sk_rmem_alloc) < sk->sk_rcvbuf) { 1189 struct sk_buff *skb = alloc_skb(size, priority); 1190 if (skb) { 1191 skb_set_owner_r(skb, sk); 1192 return skb; 1193 } 1194 } 1195 return NULL; 1196} 1197 1198/* 1199 * Allocate a memory block from the socket's option memory buffer. 1200 */ 1201void *sock_kmalloc(struct sock *sk, int size, gfp_t priority) 1202{ 1203 if ((unsigned)size <= sysctl_optmem_max && 1204 atomic_read(&sk->sk_omem_alloc) + size < sysctl_optmem_max) { 1205 void *mem; 1206 /* First do the add, to avoid the race if kmalloc 1207 * might sleep. 1208 */ 1209 atomic_add(size, &sk->sk_omem_alloc); 1210 mem = kmalloc(size, priority); 1211 if (mem) 1212 return mem; 1213 atomic_sub(size, &sk->sk_omem_alloc); 1214 } 1215 return NULL; 1216} 1217 1218/* 1219 * Free an option memory block. 1220 */ 1221void sock_kfree_s(struct sock *sk, void *mem, int size) 1222{ 1223 kfree(mem); 1224 atomic_sub(size, &sk->sk_omem_alloc); 1225} 1226 1227/* It is almost wait_for_tcp_memory minus release_sock/lock_sock. 1228 I think, these locks should be removed for datagram sockets. 1229 */ 1230static long sock_wait_for_wmem(struct sock * sk, long timeo) 1231{ 1232 DEFINE_WAIT(wait); 1233 1234 clear_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags); 1235 for (;;) { 1236 if (!timeo) 1237 break; 1238 if (signal_pending(current)) 1239 break; 1240 set_bit(SOCK_NOSPACE, &sk->sk_socket->flags); 1241 prepare_to_wait(sk->sk_sleep, &wait, TASK_INTERRUPTIBLE); 1242 if (atomic_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf) 1243 break; 1244 if (sk->sk_shutdown & SEND_SHUTDOWN) 1245 break; 1246 if (sk->sk_err) 1247 break; 1248 timeo = schedule_timeout(timeo); 1249 } 1250 finish_wait(sk->sk_sleep, &wait); 1251 return timeo; 1252} 1253 1254 1255/* 1256 * Generic send/receive buffer handlers 1257 */ 1258 1259static struct sk_buff *sock_alloc_send_pskb(struct sock *sk, 1260 unsigned long header_len, 1261 unsigned long data_len, 1262 int noblock, int *errcode) 1263{ 1264 struct sk_buff *skb; 1265 gfp_t gfp_mask; 1266 long timeo; 1267 int err; 1268 1269 gfp_mask = sk->sk_allocation; 1270 if (gfp_mask & __GFP_WAIT) 1271 gfp_mask |= __GFP_REPEAT; 1272 1273 timeo = sock_sndtimeo(sk, noblock); 1274 while (1) { 1275 err = sock_error(sk); 1276 if (err != 0) 1277 goto failure; 1278 1279 err = -EPIPE; 1280 if (sk->sk_shutdown & SEND_SHUTDOWN) 1281 goto failure; 1282 1283 if (atomic_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf) { 1284 skb = alloc_skb(header_len, gfp_mask); 1285 if (skb) { 1286 int npages; 1287 int i; 1288 1289 /* No pages, we're done... */ 1290 if (!data_len) 1291 break; 1292 1293 npages = (data_len + (PAGE_SIZE - 1)) >> PAGE_SHIFT; 1294 skb->truesize += data_len; 1295 skb_shinfo(skb)->nr_frags = npages; 1296 for (i = 0; i < npages; i++) { 1297 struct page *page; 1298 skb_frag_t *frag; 1299 1300 page = alloc_pages(sk->sk_allocation, 0); 1301 if (!page) { 1302 err = -ENOBUFS; 1303 skb_shinfo(skb)->nr_frags = i; 1304 kfree_skb(skb); 1305 goto failure; 1306 } 1307 1308 frag = &skb_shinfo(skb)->frags[i]; 1309 frag->page = page; 1310 frag->page_offset = 0; 1311 frag->size = (data_len >= PAGE_SIZE ? 1312 PAGE_SIZE : 1313 data_len); 1314 data_len -= PAGE_SIZE; 1315 } 1316 1317 /* Full success... */ 1318 break; 1319 } 1320 err = -ENOBUFS; 1321 goto failure; 1322 } 1323 set_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags); 1324 set_bit(SOCK_NOSPACE, &sk->sk_socket->flags); 1325 err = -EAGAIN; 1326 if (!timeo) 1327 goto failure; 1328 if (signal_pending(current)) 1329 goto interrupted; 1330 timeo = sock_wait_for_wmem(sk, timeo); 1331 } 1332 1333 skb_set_owner_w(skb, sk); 1334 return skb; 1335 1336interrupted: 1337 err = sock_intr_errno(timeo); 1338failure: 1339 *errcode = err; 1340 return NULL; 1341} 1342 1343struct sk_buff *sock_alloc_send_skb(struct sock *sk, unsigned long size, 1344 int noblock, int *errcode) 1345{ 1346 return sock_alloc_send_pskb(sk, size, 0, noblock, errcode); 1347} 1348 1349static void __lock_sock(struct sock *sk) 1350{ 1351 DEFINE_WAIT(wait); 1352 1353 for (;;) { 1354 prepare_to_wait_exclusive(&sk->sk_lock.wq, &wait, 1355 TASK_UNINTERRUPTIBLE); 1356 spin_unlock_bh(&sk->sk_lock.slock); 1357 schedule(); 1358 spin_lock_bh(&sk->sk_lock.slock); 1359 if (!sock_owned_by_user(sk)) 1360 break; 1361 } 1362 finish_wait(&sk->sk_lock.wq, &wait); 1363} 1364 1365static void __release_sock(struct sock *sk) 1366{ 1367 struct sk_buff *skb = sk->sk_backlog.head; 1368 1369 do { 1370 sk->sk_backlog.head = sk->sk_backlog.tail = NULL; 1371 bh_unlock_sock(sk); 1372 1373 do { 1374 struct sk_buff *next = skb->next; 1375 1376 skb->next = NULL; 1377 sk_backlog_rcv(sk, skb); 1378 1379 /* 1380 * We are in process context here with softirqs 1381 * disabled, use cond_resched_softirq() to preempt. 1382 * This is safe to do because we've taken the backlog 1383 * queue private: 1384 */ 1385 cond_resched_softirq(); 1386 1387 skb = next; 1388 } while (skb != NULL); 1389 1390 bh_lock_sock(sk); 1391 } while ((skb = sk->sk_backlog.head) != NULL); 1392} 1393 1394/** 1395 * sk_wait_data - wait for data to arrive at sk_receive_queue 1396 * @sk: sock to wait on 1397 * @timeo: for how long 1398 * 1399 * Now socket state including sk->sk_err is changed only under lock, 1400 * hence we may omit checks after joining wait queue. 1401 * We check receive queue before schedule() only as optimization; 1402 * it is very likely that release_sock() added new data. 1403 */ 1404int sk_wait_data(struct sock *sk, long *timeo) 1405{ 1406 int rc; 1407 DEFINE_WAIT(wait); 1408 1409 prepare_to_wait(sk->sk_sleep, &wait, TASK_INTERRUPTIBLE); 1410 set_bit(SOCK_ASYNC_WAITDATA, &sk->sk_socket->flags); 1411 rc = sk_wait_event(sk, timeo, !skb_queue_empty(&sk->sk_receive_queue)); 1412 clear_bit(SOCK_ASYNC_WAITDATA, &sk->sk_socket->flags); 1413 finish_wait(sk->sk_sleep, &wait); 1414 return rc; 1415} 1416 1417EXPORT_SYMBOL(sk_wait_data); 1418 1419/** 1420 * __sk_mem_schedule - increase sk_forward_alloc and memory_allocated 1421 * @sk: socket 1422 * @size: memory size to allocate 1423 * @kind: allocation type 1424 * 1425 * If kind is SK_MEM_SEND, it means wmem allocation. Otherwise it means 1426 * rmem allocation. This function assumes that protocols which have 1427 * memory_pressure use sk_wmem_queued as write buffer accounting. 1428 */ 1429int __sk_mem_schedule(struct sock *sk, int size, int kind) 1430{ 1431 struct proto *prot = sk->sk_prot; 1432 int amt = sk_mem_pages(size); 1433 int allocated; 1434 1435 sk->sk_forward_alloc += amt * SK_MEM_QUANTUM; 1436 allocated = atomic_add_return(amt, prot->memory_allocated); 1437 1438 /* Under limit. */ 1439 if (allocated <= prot->sysctl_mem[0]) { 1440 if (prot->memory_pressure && *prot->memory_pressure) 1441 *prot->memory_pressure = 0; 1442 return 1; 1443 } 1444 1445 /* Under pressure. */ 1446 if (allocated > prot->sysctl_mem[1]) 1447 if (prot->enter_memory_pressure) 1448 prot->enter_memory_pressure(sk); 1449 1450 /* Over hard limit. */ 1451 if (allocated > prot->sysctl_mem[2]) 1452 goto suppress_allocation; 1453 1454 /* guarantee minimum buffer size under pressure */ 1455 if (kind == SK_MEM_RECV) { 1456 if (atomic_read(&sk->sk_rmem_alloc) < prot->sysctl_rmem[0]) 1457 return 1; 1458 } else { /* SK_MEM_SEND */ 1459 if (sk->sk_type == SOCK_STREAM) { 1460 if (sk->sk_wmem_queued < prot->sysctl_wmem[0]) 1461 return 1; 1462 } else if (atomic_read(&sk->sk_wmem_alloc) < 1463 prot->sysctl_wmem[0]) 1464 return 1; 1465 } 1466 1467 if (prot->memory_pressure) { 1468 int alloc; 1469 1470 if (!*prot->memory_pressure) 1471 return 1; 1472 alloc = percpu_counter_read_positive(prot->sockets_allocated); 1473 if (prot->sysctl_mem[2] > alloc * 1474 sk_mem_pages(sk->sk_wmem_queued + 1475 atomic_read(&sk->sk_rmem_alloc) + 1476 sk->sk_forward_alloc)) 1477 return 1; 1478 } 1479 1480suppress_allocation: 1481 1482 if (kind == SK_MEM_SEND && sk->sk_type == SOCK_STREAM) { 1483 sk_stream_moderate_sndbuf(sk); 1484 1485 /* Fail only if socket is _under_ its sndbuf. 1486 * In this case we cannot block, so that we have to fail. 1487 */ 1488 if (sk->sk_wmem_queued + size >= sk->sk_sndbuf) 1489 return 1; 1490 } 1491 1492 /* Alas. Undo changes. */ 1493 sk->sk_forward_alloc -= amt * SK_MEM_QUANTUM; 1494 atomic_sub(amt, prot->memory_allocated); 1495 return 0; 1496} 1497 1498EXPORT_SYMBOL(__sk_mem_schedule); 1499 1500/** 1501 * __sk_reclaim - reclaim memory_allocated 1502 * @sk: socket 1503 */ 1504void __sk_mem_reclaim(struct sock *sk) 1505{ 1506 struct proto *prot = sk->sk_prot; 1507 1508 atomic_sub(sk->sk_forward_alloc >> SK_MEM_QUANTUM_SHIFT, 1509 prot->memory_allocated); 1510 sk->sk_forward_alloc &= SK_MEM_QUANTUM - 1; 1511 1512 if (prot->memory_pressure && *prot->memory_pressure && 1513 (atomic_read(prot->memory_allocated) < prot->sysctl_mem[0])) 1514 *prot->memory_pressure = 0; 1515} 1516 1517EXPORT_SYMBOL(__sk_mem_reclaim); 1518 1519 1520/* 1521 * Set of default routines for initialising struct proto_ops when 1522 * the protocol does not support a particular function. In certain 1523 * cases where it makes no sense for a protocol to have a "do nothing" 1524 * function, some default processing is provided. 1525 */ 1526 1527int sock_no_bind(struct socket *sock, struct sockaddr *saddr, int len) 1528{ 1529 return -EOPNOTSUPP; 1530} 1531 1532int sock_no_connect(struct socket *sock, struct sockaddr *saddr, 1533 int len, int flags) 1534{ 1535 return -EOPNOTSUPP; 1536} 1537 1538int sock_no_socketpair(struct socket *sock1, struct socket *sock2) 1539{ 1540 return -EOPNOTSUPP; 1541} 1542 1543int sock_no_accept(struct socket *sock, struct socket *newsock, int flags) 1544{ 1545 return -EOPNOTSUPP; 1546} 1547 1548int sock_no_getname(struct socket *sock, struct sockaddr *saddr, 1549 int *len, int peer) 1550{ 1551 return -EOPNOTSUPP; 1552} 1553 1554unsigned int sock_no_poll(struct file * file, struct socket *sock, poll_table *pt) 1555{ 1556 return 0; 1557} 1558 1559int sock_no_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg) 1560{ 1561 return -EOPNOTSUPP; 1562} 1563 1564int sock_no_listen(struct socket *sock, int backlog) 1565{ 1566 return -EOPNOTSUPP; 1567} 1568 1569int sock_no_shutdown(struct socket *sock, int how) 1570{ 1571 return -EOPNOTSUPP; 1572} 1573 1574int sock_no_setsockopt(struct socket *sock, int level, int optname, 1575 char __user *optval, int optlen) 1576{ 1577 return -EOPNOTSUPP; 1578} 1579 1580int sock_no_getsockopt(struct socket *sock, int level, int optname, 1581 char __user *optval, int __user *optlen) 1582{ 1583 return -EOPNOTSUPP; 1584} 1585 1586int sock_no_sendmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *m, 1587 size_t len) 1588{ 1589 return -EOPNOTSUPP; 1590} 1591 1592int sock_no_recvmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *m, 1593 size_t len, int flags) 1594{ 1595 return -EOPNOTSUPP; 1596} 1597 1598int sock_no_mmap(struct file *file, struct socket *sock, struct vm_area_struct *vma) 1599{ 1600 /* Mirror missing mmap method error code */ 1601 return -ENODEV; 1602} 1603 1604ssize_t sock_no_sendpage(struct socket *sock, struct page *page, int offset, size_t size, int flags) 1605{ 1606 ssize_t res; 1607 struct msghdr msg = {.msg_flags = flags}; 1608 struct kvec iov; 1609 char *kaddr = kmap(page); 1610 iov.iov_base = kaddr + offset; 1611 iov.iov_len = size; 1612 res = kernel_sendmsg(sock, &msg, &iov, 1, size); 1613 kunmap(page); 1614 return res; 1615} 1616 1617/* 1618 * Default Socket Callbacks 1619 */ 1620 1621static void sock_def_wakeup(struct sock *sk) 1622{ 1623 read_lock(&sk->sk_callback_lock); 1624 if (sk->sk_sleep && waitqueue_active(sk->sk_sleep)) 1625 wake_up_interruptible_all(sk->sk_sleep); 1626 read_unlock(&sk->sk_callback_lock); 1627} 1628 1629static void sock_def_error_report(struct sock *sk) 1630{ 1631 read_lock(&sk->sk_callback_lock); 1632 if (sk->sk_sleep && waitqueue_active(sk->sk_sleep)) 1633 wake_up_interruptible(sk->sk_sleep); 1634 sk_wake_async(sk, SOCK_WAKE_IO, POLL_ERR); 1635 read_unlock(&sk->sk_callback_lock); 1636} 1637 1638static void sock_def_readable(struct sock *sk, int len) 1639{ 1640 read_lock(&sk->sk_callback_lock); 1641 if (sk->sk_sleep && waitqueue_active(sk->sk_sleep)) 1642 wake_up_interruptible_sync(sk->sk_sleep); 1643 sk_wake_async(sk, SOCK_WAKE_WAITD, POLL_IN); 1644 read_unlock(&sk->sk_callback_lock); 1645} 1646 1647static void sock_def_write_space(struct sock *sk) 1648{ 1649 read_lock(&sk->sk_callback_lock); 1650 1651 /* Do not wake up a writer until he can make "significant" 1652 * progress. --DaveM 1653 */ 1654 if ((atomic_read(&sk->sk_wmem_alloc) << 1) <= sk->sk_sndbuf) { 1655 if (sk->sk_sleep && waitqueue_active(sk->sk_sleep)) 1656 wake_up_interruptible_sync(sk->sk_sleep); 1657 1658 /* Should agree with poll, otherwise some programs break */ 1659 if (sock_writeable(sk)) 1660 sk_wake_async(sk, SOCK_WAKE_SPACE, POLL_OUT); 1661 } 1662 1663 read_unlock(&sk->sk_callback_lock); 1664} 1665 1666static void sock_def_destruct(struct sock *sk) 1667{ 1668 kfree(sk->sk_protinfo); 1669} 1670 1671void sk_send_sigurg(struct sock *sk) 1672{ 1673 if (sk->sk_socket && sk->sk_socket->file) 1674 if (send_sigurg(&sk->sk_socket->file->f_owner)) 1675 sk_wake_async(sk, SOCK_WAKE_URG, POLL_PRI); 1676} 1677 1678void sk_reset_timer(struct sock *sk, struct timer_list* timer, 1679 unsigned long expires) 1680{ 1681 if (!mod_timer(timer, expires)) 1682 sock_hold(sk); 1683} 1684 1685EXPORT_SYMBOL(sk_reset_timer); 1686 1687void sk_stop_timer(struct sock *sk, struct timer_list* timer) 1688{ 1689 if (timer_pending(timer) && del_timer(timer)) 1690 __sock_put(sk); 1691} 1692 1693EXPORT_SYMBOL(sk_stop_timer); 1694 1695void sock_init_data(struct socket *sock, struct sock *sk) 1696{ 1697 skb_queue_head_init(&sk->sk_receive_queue); 1698 skb_queue_head_init(&sk->sk_write_queue); 1699 skb_queue_head_init(&sk->sk_error_queue); 1700#ifdef CONFIG_NET_DMA 1701 skb_queue_head_init(&sk->sk_async_wait_queue); 1702#endif 1703 1704 sk->sk_send_head = NULL; 1705 1706 init_timer(&sk->sk_timer); 1707 1708 sk->sk_allocation = GFP_KERNEL; 1709 sk->sk_rcvbuf = sysctl_rmem_default; 1710 sk->sk_sndbuf = sysctl_wmem_default; 1711 sk->sk_state = TCP_CLOSE; 1712 sk_set_socket(sk, sock); 1713 1714 sock_set_flag(sk, SOCK_ZAPPED); 1715 1716 if (sock) { 1717 sk->sk_type = sock->type; 1718 sk->sk_sleep = &sock->wait; 1719 sock->sk = sk; 1720 } else 1721 sk->sk_sleep = NULL; 1722 1723 rwlock_init(&sk->sk_dst_lock); 1724 rwlock_init(&sk->sk_callback_lock); 1725 lockdep_set_class_and_name(&sk->sk_callback_lock, 1726 af_callback_keys + sk->sk_family, 1727 af_family_clock_key_strings[sk->sk_family]); 1728 1729 sk->sk_state_change = sock_def_wakeup; 1730 sk->sk_data_ready = sock_def_readable; 1731 sk->sk_write_space = sock_def_write_space; 1732 sk->sk_error_report = sock_def_error_report; 1733 sk->sk_destruct = sock_def_destruct; 1734 1735 sk->sk_sndmsg_page = NULL; 1736 sk->sk_sndmsg_off = 0; 1737 1738 sk->sk_peercred.pid = 0; 1739 sk->sk_peercred.uid = -1; 1740 sk->sk_peercred.gid = -1; 1741 sk->sk_write_pending = 0; 1742 sk->sk_rcvlowat = 1; 1743 sk->sk_rcvtimeo = MAX_SCHEDULE_TIMEOUT; 1744 sk->sk_sndtimeo = MAX_SCHEDULE_TIMEOUT; 1745 1746 sk->sk_stamp = ktime_set(-1L, 0); 1747 1748 atomic_set(&sk->sk_refcnt, 1); 1749 atomic_set(&sk->sk_drops, 0); 1750} 1751 1752void lock_sock_nested(struct sock *sk, int subclass) 1753{ 1754 might_sleep(); 1755 spin_lock_bh(&sk->sk_lock.slock); 1756 if (sk->sk_lock.owned) 1757 __lock_sock(sk); 1758 sk->sk_lock.owned = 1; 1759 spin_unlock(&sk->sk_lock.slock); 1760 /* 1761 * The sk_lock has mutex_lock() semantics here: 1762 */ 1763 mutex_acquire(&sk->sk_lock.dep_map, subclass, 0, _RET_IP_); 1764 local_bh_enable(); 1765} 1766 1767EXPORT_SYMBOL(lock_sock_nested); 1768 1769void release_sock(struct sock *sk) 1770{ 1771 /* 1772 * The sk_lock has mutex_unlock() semantics: 1773 */ 1774 mutex_release(&sk->sk_lock.dep_map, 1, _RET_IP_); 1775 1776 spin_lock_bh(&sk->sk_lock.slock); 1777 if (sk->sk_backlog.tail) 1778 __release_sock(sk); 1779 sk->sk_lock.owned = 0; 1780 if (waitqueue_active(&sk->sk_lock.wq)) 1781 wake_up(&sk->sk_lock.wq); 1782 spin_unlock_bh(&sk->sk_lock.slock); 1783} 1784EXPORT_SYMBOL(release_sock); 1785 1786int sock_get_timestamp(struct sock *sk, struct timeval __user *userstamp) 1787{ 1788 struct timeval tv; 1789 if (!sock_flag(sk, SOCK_TIMESTAMP)) 1790 sock_enable_timestamp(sk); 1791 tv = ktime_to_timeval(sk->sk_stamp); 1792 if (tv.tv_sec == -1) 1793 return -ENOENT; 1794 if (tv.tv_sec == 0) { 1795 sk->sk_stamp = ktime_get_real(); 1796 tv = ktime_to_timeval(sk->sk_stamp); 1797 } 1798 return copy_to_user(userstamp, &tv, sizeof(tv)) ? -EFAULT : 0; 1799} 1800EXPORT_SYMBOL(sock_get_timestamp); 1801 1802int sock_get_timestampns(struct sock *sk, struct timespec __user *userstamp) 1803{ 1804 struct timespec ts; 1805 if (!sock_flag(sk, SOCK_TIMESTAMP)) 1806 sock_enable_timestamp(sk); 1807 ts = ktime_to_timespec(sk->sk_stamp); 1808 if (ts.tv_sec == -1) 1809 return -ENOENT; 1810 if (ts.tv_sec == 0) { 1811 sk->sk_stamp = ktime_get_real(); 1812 ts = ktime_to_timespec(sk->sk_stamp); 1813 } 1814 return copy_to_user(userstamp, &ts, sizeof(ts)) ? -EFAULT : 0; 1815} 1816EXPORT_SYMBOL(sock_get_timestampns); 1817 1818void sock_enable_timestamp(struct sock *sk) 1819{ 1820 if (!sock_flag(sk, SOCK_TIMESTAMP)) { 1821 sock_set_flag(sk, SOCK_TIMESTAMP); 1822 net_enable_timestamp(); 1823 } 1824} 1825 1826/* 1827 * Get a socket option on an socket. 1828 * 1829 * FIX: POSIX 1003.1g is very ambiguous here. It states that 1830 * asynchronous errors should be reported by getsockopt. We assume 1831 * this means if you specify SO_ERROR (otherwise whats the point of it). 1832 */ 1833int sock_common_getsockopt(struct socket *sock, int level, int optname, 1834 char __user *optval, int __user *optlen) 1835{ 1836 struct sock *sk = sock->sk; 1837 1838 return sk->sk_prot->getsockopt(sk, level, optname, optval, optlen); 1839} 1840 1841EXPORT_SYMBOL(sock_common_getsockopt); 1842 1843#ifdef CONFIG_COMPAT 1844int compat_sock_common_getsockopt(struct socket *sock, int level, int optname, 1845 char __user *optval, int __user *optlen) 1846{ 1847 struct sock *sk = sock->sk; 1848 1849 if (sk->sk_prot->compat_getsockopt != NULL) 1850 return sk->sk_prot->compat_getsockopt(sk, level, optname, 1851 optval, optlen); 1852 return sk->sk_prot->getsockopt(sk, level, optname, optval, optlen); 1853} 1854EXPORT_SYMBOL(compat_sock_common_getsockopt); 1855#endif 1856 1857int sock_common_recvmsg(struct kiocb *iocb, struct socket *sock, 1858 struct msghdr *msg, size_t size, int flags) 1859{ 1860 struct sock *sk = sock->sk; 1861 int addr_len = 0; 1862 int err; 1863 1864 err = sk->sk_prot->recvmsg(iocb, sk, msg, size, flags & MSG_DONTWAIT, 1865 flags & ~MSG_DONTWAIT, &addr_len); 1866 if (err >= 0) 1867 msg->msg_namelen = addr_len; 1868 return err; 1869} 1870 1871EXPORT_SYMBOL(sock_common_recvmsg); 1872 1873/* 1874 * Set socket options on an inet socket. 1875 */ 1876int sock_common_setsockopt(struct socket *sock, int level, int optname, 1877 char __user *optval, int optlen) 1878{ 1879 struct sock *sk = sock->sk; 1880 1881 return sk->sk_prot->setsockopt(sk, level, optname, optval, optlen); 1882} 1883 1884EXPORT_SYMBOL(sock_common_setsockopt); 1885 1886#ifdef CONFIG_COMPAT 1887int compat_sock_common_setsockopt(struct socket *sock, int level, int optname, 1888 char __user *optval, int optlen) 1889{ 1890 struct sock *sk = sock->sk; 1891 1892 if (sk->sk_prot->compat_setsockopt != NULL) 1893 return sk->sk_prot->compat_setsockopt(sk, level, optname, 1894 optval, optlen); 1895 return sk->sk_prot->setsockopt(sk, level, optname, optval, optlen); 1896} 1897EXPORT_SYMBOL(compat_sock_common_setsockopt); 1898#endif 1899 1900void sk_common_release(struct sock *sk) 1901{ 1902 if (sk->sk_prot->destroy) 1903 sk->sk_prot->destroy(sk); 1904 1905 /* 1906 * Observation: when sock_common_release is called, processes have 1907 * no access to socket. But net still has. 1908 * Step one, detach it from networking: 1909 * 1910 * A. Remove from hash tables. 1911 */ 1912 1913 sk->sk_prot->unhash(sk); 1914 1915 /* 1916 * In this point socket cannot receive new packets, but it is possible 1917 * that some packets are in flight because some CPU runs receiver and 1918 * did hash table lookup before we unhashed socket. They will achieve 1919 * receive queue and will be purged by socket destructor. 1920 * 1921 * Also we still have packets pending on receive queue and probably, 1922 * our own packets waiting in device queues. sock_destroy will drain 1923 * receive queue, but transmitted packets will delay socket destruction 1924 * until the last reference will be released. 1925 */ 1926 1927 sock_orphan(sk); 1928 1929 xfrm_sk_free_policy(sk); 1930 1931 sk_refcnt_debug_release(sk); 1932 sock_put(sk); 1933} 1934 1935EXPORT_SYMBOL(sk_common_release); 1936 1937static DEFINE_RWLOCK(proto_list_lock); 1938static LIST_HEAD(proto_list); 1939 1940#ifdef CONFIG_PROC_FS 1941#define PROTO_INUSE_NR 64 /* should be enough for the first time */ 1942struct prot_inuse { 1943 int val[PROTO_INUSE_NR]; 1944}; 1945 1946static DECLARE_BITMAP(proto_inuse_idx, PROTO_INUSE_NR); 1947 1948#ifdef CONFIG_NET_NS 1949void sock_prot_inuse_add(struct net *net, struct proto *prot, int val) 1950{ 1951 int cpu = smp_processor_id(); 1952 per_cpu_ptr(net->core.inuse, cpu)->val[prot->inuse_idx] += val; 1953} 1954EXPORT_SYMBOL_GPL(sock_prot_inuse_add); 1955 1956int sock_prot_inuse_get(struct net *net, struct proto *prot) 1957{ 1958 int cpu, idx = prot->inuse_idx; 1959 int res = 0; 1960 1961 for_each_possible_cpu(cpu) 1962 res += per_cpu_ptr(net->core.inuse, cpu)->val[idx]; 1963 1964 return res >= 0 ? res : 0; 1965} 1966EXPORT_SYMBOL_GPL(sock_prot_inuse_get); 1967 1968static int sock_inuse_init_net(struct net *net) 1969{ 1970 net->core.inuse = alloc_percpu(struct prot_inuse); 1971 return net->core.inuse ? 0 : -ENOMEM; 1972} 1973 1974static void sock_inuse_exit_net(struct net *net) 1975{ 1976 free_percpu(net->core.inuse); 1977} 1978 1979static struct pernet_operations net_inuse_ops = { 1980 .init = sock_inuse_init_net, 1981 .exit = sock_inuse_exit_net, 1982}; 1983 1984static __init int net_inuse_init(void) 1985{ 1986 if (register_pernet_subsys(&net_inuse_ops)) 1987 panic("Cannot initialize net inuse counters"); 1988 1989 return 0; 1990} 1991 1992core_initcall(net_inuse_init); 1993#else 1994static DEFINE_PER_CPU(struct prot_inuse, prot_inuse); 1995 1996void sock_prot_inuse_add(struct net *net, struct proto *prot, int val) 1997{ 1998 __get_cpu_var(prot_inuse).val[prot->inuse_idx] += val; 1999} 2000EXPORT_SYMBOL_GPL(sock_prot_inuse_add); 2001 2002int sock_prot_inuse_get(struct net *net, struct proto *prot) 2003{ 2004 int cpu, idx = prot->inuse_idx; 2005 int res = 0; 2006 2007 for_each_possible_cpu(cpu) 2008 res += per_cpu(prot_inuse, cpu).val[idx]; 2009 2010 return res >= 0 ? res : 0; 2011} 2012EXPORT_SYMBOL_GPL(sock_prot_inuse_get); 2013#endif 2014 2015static void assign_proto_idx(struct proto *prot) 2016{ 2017 prot->inuse_idx = find_first_zero_bit(proto_inuse_idx, PROTO_INUSE_NR); 2018 2019 if (unlikely(prot->inuse_idx == PROTO_INUSE_NR - 1)) { 2020 printk(KERN_ERR "PROTO_INUSE_NR exhausted\n"); 2021 return; 2022 } 2023 2024 set_bit(prot->inuse_idx, proto_inuse_idx); 2025} 2026 2027static void release_proto_idx(struct proto *prot) 2028{ 2029 if (prot->inuse_idx != PROTO_INUSE_NR - 1) 2030 clear_bit(prot->inuse_idx, proto_inuse_idx); 2031} 2032#else 2033static inline void assign_proto_idx(struct proto *prot) 2034{ 2035} 2036 2037static inline void release_proto_idx(struct proto *prot) 2038{ 2039} 2040#endif 2041 2042int proto_register(struct proto *prot, int alloc_slab) 2043{ 2044 if (alloc_slab) { 2045 prot->slab = kmem_cache_create(prot->name, prot->obj_size, 0, 2046 SLAB_HWCACHE_ALIGN | prot->slab_flags, 2047 NULL); 2048 2049 if (prot->slab == NULL) { 2050 printk(KERN_CRIT "%s: Can't create sock SLAB cache!\n", 2051 prot->name); 2052 goto out; 2053 } 2054 2055 if (prot->rsk_prot != NULL) { 2056 static const char mask[] = "request_sock_%s"; 2057 2058 prot->rsk_prot->slab_name = kmalloc(strlen(prot->name) + sizeof(mask) - 1, GFP_KERNEL); 2059 if (prot->rsk_prot->slab_name == NULL) 2060 goto out_free_sock_slab; 2061 2062 sprintf(prot->rsk_prot->slab_name, mask, prot->name); 2063 prot->rsk_prot->slab = kmem_cache_create(prot->rsk_prot->slab_name, 2064 prot->rsk_prot->obj_size, 0, 2065 SLAB_HWCACHE_ALIGN, NULL); 2066 2067 if (prot->rsk_prot->slab == NULL) { 2068 printk(KERN_CRIT "%s: Can't create request sock SLAB cache!\n", 2069 prot->name); 2070 goto out_free_request_sock_slab_name; 2071 } 2072 } 2073 2074 if (prot->twsk_prot != NULL) { 2075 static const char mask[] = "tw_sock_%s"; 2076 2077 prot->twsk_prot->twsk_slab_name = kmalloc(strlen(prot->name) + sizeof(mask) - 1, GFP_KERNEL); 2078 2079 if (prot->twsk_prot->twsk_slab_name == NULL) 2080 goto out_free_request_sock_slab; 2081 2082 sprintf(prot->twsk_prot->twsk_slab_name, mask, prot->name); 2083 prot->twsk_prot->twsk_slab = 2084 kmem_cache_create(prot->twsk_prot->twsk_slab_name, 2085 prot->twsk_prot->twsk_obj_size, 2086 0, 2087 SLAB_HWCACHE_ALIGN | 2088 prot->slab_flags, 2089 NULL); 2090 if (prot->twsk_prot->twsk_slab == NULL) 2091 goto out_free_timewait_sock_slab_name; 2092 } 2093 } 2094 2095 write_lock(&proto_list_lock); 2096 list_add(&prot->node, &proto_list); 2097 assign_proto_idx(prot); 2098 write_unlock(&proto_list_lock); 2099 return 0; 2100 2101out_free_timewait_sock_slab_name: 2102 kfree(prot->twsk_prot->twsk_slab_name); 2103out_free_request_sock_slab: 2104 if (prot->rsk_prot && prot->rsk_prot->slab) { 2105 kmem_cache_destroy(prot->rsk_prot->slab); 2106 prot->rsk_prot->slab = NULL; 2107 } 2108out_free_request_sock_slab_name: 2109 kfree(prot->rsk_prot->slab_name); 2110out_free_sock_slab: 2111 kmem_cache_destroy(prot->slab); 2112 prot->slab = NULL; 2113out: 2114 return -ENOBUFS; 2115} 2116 2117EXPORT_SYMBOL(proto_register); 2118 2119void proto_unregister(struct proto *prot) 2120{ 2121 write_lock(&proto_list_lock); 2122 release_proto_idx(prot); 2123 list_del(&prot->node); 2124 write_unlock(&proto_list_lock); 2125 2126 if (prot->slab != NULL) { 2127 kmem_cache_destroy(prot->slab); 2128 prot->slab = NULL; 2129 } 2130 2131 if (prot->rsk_prot != NULL && prot->rsk_prot->slab != NULL) { 2132 kmem_cache_destroy(prot->rsk_prot->slab); 2133 kfree(prot->rsk_prot->slab_name); 2134 prot->rsk_prot->slab = NULL; 2135 } 2136 2137 if (prot->twsk_prot != NULL && prot->twsk_prot->twsk_slab != NULL) { 2138 kmem_cache_destroy(prot->twsk_prot->twsk_slab); 2139 kfree(prot->twsk_prot->twsk_slab_name); 2140 prot->twsk_prot->twsk_slab = NULL; 2141 } 2142} 2143 2144EXPORT_SYMBOL(proto_unregister); 2145 2146#ifdef CONFIG_PROC_FS 2147static void *proto_seq_start(struct seq_file *seq, loff_t *pos) 2148 __acquires(proto_list_lock) 2149{ 2150 read_lock(&proto_list_lock); 2151 return seq_list_start_head(&proto_list, *pos); 2152} 2153 2154static void *proto_seq_next(struct seq_file *seq, void *v, loff_t *pos) 2155{ 2156 return seq_list_next(v, &proto_list, pos); 2157} 2158 2159static void proto_seq_stop(struct seq_file *seq, void *v) 2160 __releases(proto_list_lock) 2161{ 2162 read_unlock(&proto_list_lock); 2163} 2164 2165static char proto_method_implemented(const void *method) 2166{ 2167 return method == NULL ? 'n' : 'y'; 2168} 2169 2170static void proto_seq_printf(struct seq_file *seq, struct proto *proto) 2171{ 2172 seq_printf(seq, "%-9s %4u %6d %6d %-3s %6u %-3s %-10s " 2173 "%2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c\n", 2174 proto->name, 2175 proto->obj_size, 2176 sock_prot_inuse_get(seq_file_net(seq), proto), 2177 proto->memory_allocated != NULL ? atomic_read(proto->memory_allocated) : -1, 2178 proto->memory_pressure != NULL ? *proto->memory_pressure ? "yes" : "no" : "NI", 2179 proto->max_header, 2180 proto->slab == NULL ? "no" : "yes", 2181 module_name(proto->owner), 2182 proto_method_implemented(proto->close), 2183 proto_method_implemented(proto->connect), 2184 proto_method_implemented(proto->disconnect), 2185 proto_method_implemented(proto->accept), 2186 proto_method_implemented(proto->ioctl), 2187 proto_method_implemented(proto->init), 2188 proto_method_implemented(proto->destroy), 2189 proto_method_implemented(proto->shutdown), 2190 proto_method_implemented(proto->setsockopt), 2191 proto_method_implemented(proto->getsockopt), 2192 proto_method_implemented(proto->sendmsg), 2193 proto_method_implemented(proto->recvmsg), 2194 proto_method_implemented(proto->sendpage), 2195 proto_method_implemented(proto->bind), 2196 proto_method_implemented(proto->backlog_rcv), 2197 proto_method_implemented(proto->hash), 2198 proto_method_implemented(proto->unhash), 2199 proto_method_implemented(proto->get_port), 2200 proto_method_implemented(proto->enter_memory_pressure)); 2201} 2202 2203static int proto_seq_show(struct seq_file *seq, void *v) 2204{ 2205 if (v == &proto_list) 2206 seq_printf(seq, "%-9s %-4s %-8s %-6s %-5s %-7s %-4s %-10s %s", 2207 "protocol", 2208 "size", 2209 "sockets", 2210 "memory", 2211 "press", 2212 "maxhdr", 2213 "slab", 2214 "module", 2215 "cl co di ac io in de sh ss gs se re sp bi br ha uh gp em\n"); 2216 else 2217 proto_seq_printf(seq, list_entry(v, struct proto, node)); 2218 return 0; 2219} 2220 2221static const struct seq_operations proto_seq_ops = { 2222 .start = proto_seq_start, 2223 .next = proto_seq_next, 2224 .stop = proto_seq_stop, 2225 .show = proto_seq_show, 2226}; 2227 2228static int proto_seq_open(struct inode *inode, struct file *file) 2229{ 2230 return seq_open_net(inode, file, &proto_seq_ops, 2231 sizeof(struct seq_net_private)); 2232} 2233 2234static const struct file_operations proto_seq_fops = { 2235 .owner = THIS_MODULE, 2236 .open = proto_seq_open, 2237 .read = seq_read, 2238 .llseek = seq_lseek, 2239 .release = seq_release_net, 2240}; 2241 2242static __net_init int proto_init_net(struct net *net) 2243{ 2244 if (!proc_net_fops_create(net, "protocols", S_IRUGO, &proto_seq_fops)) 2245 return -ENOMEM; 2246 2247 return 0; 2248} 2249 2250static __net_exit void proto_exit_net(struct net *net) 2251{ 2252 proc_net_remove(net, "protocols"); 2253} 2254 2255 2256static __net_initdata struct pernet_operations proto_net_ops = { 2257 .init = proto_init_net, 2258 .exit = proto_exit_net, 2259}; 2260 2261static int __init proto_init(void) 2262{ 2263 return register_pernet_subsys(&proto_net_ops); 2264} 2265 2266subsys_initcall(proto_init); 2267 2268#endif /* PROC_FS */ 2269 2270EXPORT_SYMBOL(sk_alloc); 2271EXPORT_SYMBOL(sk_free); 2272EXPORT_SYMBOL(sk_send_sigurg); 2273EXPORT_SYMBOL(sock_alloc_send_skb); 2274EXPORT_SYMBOL(sock_init_data); 2275EXPORT_SYMBOL(sock_kfree_s); 2276EXPORT_SYMBOL(sock_kmalloc); 2277EXPORT_SYMBOL(sock_no_accept); 2278EXPORT_SYMBOL(sock_no_bind); 2279EXPORT_SYMBOL(sock_no_connect); 2280EXPORT_SYMBOL(sock_no_getname); 2281EXPORT_SYMBOL(sock_no_getsockopt); 2282EXPORT_SYMBOL(sock_no_ioctl); 2283EXPORT_SYMBOL(sock_no_listen); 2284EXPORT_SYMBOL(sock_no_mmap); 2285EXPORT_SYMBOL(sock_no_poll); 2286EXPORT_SYMBOL(sock_no_recvmsg); 2287EXPORT_SYMBOL(sock_no_sendmsg); 2288EXPORT_SYMBOL(sock_no_sendpage); 2289EXPORT_SYMBOL(sock_no_setsockopt); 2290EXPORT_SYMBOL(sock_no_shutdown); 2291EXPORT_SYMBOL(sock_no_socketpair); 2292EXPORT_SYMBOL(sock_rfree); 2293EXPORT_SYMBOL(sock_setsockopt); 2294EXPORT_SYMBOL(sock_wfree); 2295EXPORT_SYMBOL(sock_wmalloc); 2296EXPORT_SYMBOL(sock_i_uid); 2297EXPORT_SYMBOL(sock_i_ino); 2298EXPORT_SYMBOL(sysctl_optmem_max); 2299