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 * Version: $Id: sock.c,v 1.117 2002/02/01 22:01:03 davem Exp $ 11 * 12 * Authors: Ross Biro 13 * Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG> 14 * Florian La Roche, <flla@stud.uni-sb.de> 15 * Alan Cox, <A.Cox@swansea.ac.uk> 16 * 17 * Fixes: 18 * Alan Cox : Numerous verify_area() problems 19 * Alan Cox : Connecting on a connecting socket 20 * now returns an error for tcp. 21 * Alan Cox : sock->protocol is set correctly. 22 * and is not sometimes left as 0. 23 * Alan Cox : connect handles icmp errors on a 24 * connect properly. Unfortunately there 25 * is a restart syscall nasty there. I 26 * can't match BSD without hacking the C 27 * library. Ideas urgently sought! 28 * Alan Cox : Disallow bind() to addresses that are 29 * not ours - especially broadcast ones!! 30 * Alan Cox : Socket 1024 _IS_ ok for users. (fencepost) 31 * Alan Cox : sock_wfree/sock_rfree don't destroy sockets, 32 * instead they leave that for the DESTROY timer. 33 * Alan Cox : Clean up error flag in accept 34 * Alan Cox : TCP ack handling is buggy, the DESTROY timer 35 * was buggy. Put a remove_sock() in the handler 36 * for memory when we hit 0. Also altered the timer 37 * code. The ACK stuff can wait and needs major 38 * TCP layer surgery. 39 * Alan Cox : Fixed TCP ack bug, removed remove sock 40 * and fixed timer/inet_bh race. 41 * Alan Cox : Added zapped flag for TCP 42 * Alan Cox : Move kfree_skb into skbuff.c and tidied up surplus code 43 * Alan Cox : for new sk_buff allocations wmalloc/rmalloc now call alloc_skb 44 * Alan Cox : kfree_s calls now are kfree_skbmem so we can track skb resources 45 * Alan Cox : Supports socket option broadcast now as does udp. Packet and raw need fixing. 46 * Alan Cox : Added RCVBUF,SNDBUF size setting. It suddenly occurred to me how easy it was so... 47 * Rick Sladkey : Relaxed UDP rules for matching packets. 48 * C.E.Hawkins : IFF_PROMISC/SIOCGHWADDR support 49 * Pauline Middelink : identd support 50 * Alan Cox : Fixed connect() taking signals I think. 51 * Alan Cox : SO_LINGER supported 52 * Alan Cox : Error reporting fixes 53 * Anonymous : inet_create tidied up (sk->reuse setting) 54 * Alan Cox : inet sockets don't set sk->type! 55 * Alan Cox : Split socket option code 56 * Alan Cox : Callbacks 57 * Alan Cox : Nagle flag for Charles & Johannes stuff 58 * Alex : Removed restriction on inet fioctl 59 * Alan Cox : Splitting INET from NET core 60 * Alan Cox : Fixed bogus SO_TYPE handling in getsockopt() 61 * Adam Caldwell : Missing return in SO_DONTROUTE/SO_DEBUG code 62 * Alan Cox : Split IP from generic code 63 * Alan Cox : New kfree_skbmem() 64 * Alan Cox : Make SO_DEBUG superuser only. 65 * Alan Cox : Allow anyone to clear SO_DEBUG 66 * (compatibility fix) 67 * Alan Cox : Added optimistic memory grabbing for AF_UNIX throughput. 68 * Alan Cox : Allocator for a socket is settable. 69 * Alan Cox : SO_ERROR includes soft errors. 70 * Alan Cox : Allow NULL arguments on some SO_ opts 71 * Alan Cox : Generic socket allocation to make hooks 72 * easier (suggested by Craig Metz). 73 * Michael Pall : SO_ERROR returns positive errno again 74 * Steve Whitehouse: Added default destructor to free 75 * protocol private data. 76 * Steve Whitehouse: Added various other default routines 77 * common to several socket families. 78 * Chris Evans : Call suser() check last on F_SETOWN 79 * Jay Schulist : Added SO_ATTACH_FILTER and SO_DETACH_FILTER. 80 * Andi Kleen : Add sock_kmalloc()/sock_kfree_s() 81 * Andi Kleen : Fix write_space callback 82 * Chris Evans : Security fixes - signedness again 83 * Arnaldo C. Melo : cleanups, use skb_queue_purge 84 * 85 * To Fix: 86 * 87 * 88 * This program is free software; you can redistribute it and/or 89 * modify it under the terms of the GNU General Public License 90 * as published by the Free Software Foundation; either version 91 * 2 of the License, or (at your option) any later version. 92 */ 93 94 #include <linux/config.h> 95 #include <linux/errno.h> 96 #include <linux/types.h> 97 #include <linux/socket.h> 98 #include <linux/in.h> 99 #include <linux/kernel.h> 100 #include <linux/module.h> 101 #include <linux/proc_fs.h> 102 #include <linux/seq_file.h> 103 #include <linux/sched.h> 104 #include <linux/timer.h> 105 #include <linux/string.h> 106 #include <linux/sockios.h> 107 #include <linux/net.h> 108 #include <linux/mm.h> 109 #include <linux/slab.h> 110 #include <linux/interrupt.h> 111 #include <linux/poll.h> 112 #include <linux/tcp.h> 113 #include <linux/init.h> 114 115 #include <asm/uaccess.h> 116 #include <asm/system.h> 117 118 #include <linux/netdevice.h> 119 #include <net/protocol.h> 120 #include <linux/skbuff.h> 121 #include <net/sock.h> 122 #include <net/xfrm.h> 123 #include <linux/ipsec.h> 124 125 #include <linux/filter.h> 126 127 #ifdef CONFIG_INET 128 #include <net/tcp.h> 129 #endif 130 131 /* Take into consideration the size of the struct sk_buff overhead in the 132 * determination of these values, since that is non-constant across 133 * platforms. This makes socket queueing behavior and performance 134 * not depend upon such differences. 135 */ 136 #define _SK_MEM_PACKETS 256 137 #define _SK_MEM_OVERHEAD (sizeof(struct sk_buff) + 256) 138 #define SK_WMEM_MAX (_SK_MEM_OVERHEAD * _SK_MEM_PACKETS) 139 #define SK_RMEM_MAX (_SK_MEM_OVERHEAD * _SK_MEM_PACKETS) 140 141 /* Run time adjustable parameters. */ 142 __u32 sysctl_wmem_max = SK_WMEM_MAX; 143 __u32 sysctl_rmem_max = SK_RMEM_MAX; 144 __u32 sysctl_wmem_default = SK_WMEM_MAX; 145 __u32 sysctl_rmem_default = SK_RMEM_MAX; 146 147 /* Maximal space eaten by iovec or ancilliary data plus some space */ 148 int sysctl_optmem_max = sizeof(unsigned long)*(2*UIO_MAXIOV + 512); 149 150 static int sock_set_timeout(long *timeo_p, char __user *optval, int optlen) 151 { 152 struct timeval tv; 153 154 if (optlen < sizeof(tv)) 155 return -EINVAL; 156 if (copy_from_user(&tv, optval, sizeof(tv))) 157 return -EFAULT; 158 159 *timeo_p = MAX_SCHEDULE_TIMEOUT; 160 if (tv.tv_sec == 0 && tv.tv_usec == 0) 161 return 0; 162 if (tv.tv_sec < (MAX_SCHEDULE_TIMEOUT/HZ - 1)) 163 *timeo_p = tv.tv_sec*HZ + (tv.tv_usec+(1000000/HZ-1))/(1000000/HZ); 164 return 0; 165 } 166 167 static void sock_warn_obsolete_bsdism(const char *name) 168 { 169 static int warned; 170 static char warncomm[TASK_COMM_LEN]; 171 if (strcmp(warncomm, current->comm) && warned < 5) { 172 strcpy(warncomm, current->comm); 173 printk(KERN_WARNING "process `%s' is using obsolete " 174 "%s SO_BSDCOMPAT\n", warncomm, name); 175 warned++; 176 } 177 } 178 179 static void sock_disable_timestamp(struct sock *sk) 180 { 181 if (sock_flag(sk, SOCK_TIMESTAMP)) { 182 sock_reset_flag(sk, SOCK_TIMESTAMP); 183 net_disable_timestamp(); 184 } 185 } 186 187 188 /* 189 * This is meant for all protocols to use and covers goings on 190 * at the socket level. Everything here is generic. 191 */ 192 193 int sock_setsockopt(struct socket *sock, int level, int optname, 194 char __user *optval, int optlen) 195 { 196 struct sock *sk=sock->sk; 197 struct sk_filter *filter; 198 int val; 199 int valbool; 200 struct linger ling; 201 int ret = 0; 202 203 /* 204 * Options without arguments 205 */ 206 207 #ifdef SO_DONTLINGER /* Compatibility item... */ 208 switch (optname) { 209 case SO_DONTLINGER: 210 sock_reset_flag(sk, SOCK_LINGER); 211 return 0; 212 } 213 #endif 214 215 if(optlen<sizeof(int)) 216 return(-EINVAL); 217 218 if (get_user(val, (int __user *)optval)) 219 return -EFAULT; 220 221 valbool = val?1:0; 222 223 lock_sock(sk); 224 225 switch(optname) 226 { 227 case SO_DEBUG: 228 if(val && !capable(CAP_NET_ADMIN)) 229 { 230 ret = -EACCES; 231 } 232 else if (valbool) 233 sock_set_flag(sk, SOCK_DBG); 234 else 235 sock_reset_flag(sk, SOCK_DBG); 236 break; 237 case SO_REUSEADDR: 238 sk->sk_reuse = valbool; 239 break; 240 case SO_TYPE: 241 case SO_ERROR: 242 ret = -ENOPROTOOPT; 243 break; 244 case SO_DONTROUTE: 245 if (valbool) 246 sock_set_flag(sk, SOCK_LOCALROUTE); 247 else 248 sock_reset_flag(sk, SOCK_LOCALROUTE); 249 break; 250 case SO_BROADCAST: 251 sock_valbool_flag(sk, SOCK_BROADCAST, valbool); 252 break; 253 case SO_SNDBUF: 254 /* Don't error on this BSD doesn't and if you think 255 about it this is right. Otherwise apps have to 256 play 'guess the biggest size' games. RCVBUF/SNDBUF 257 are treated in BSD as hints */ 258 259 if (val > sysctl_wmem_max) 260 val = sysctl_wmem_max; 261 262 sk->sk_userlocks |= SOCK_SNDBUF_LOCK; 263 if ((val * 2) < SOCK_MIN_SNDBUF) 264 sk->sk_sndbuf = SOCK_MIN_SNDBUF; 265 else 266 sk->sk_sndbuf = val * 2; 267 268 /* 269 * Wake up sending tasks if we 270 * upped the value. 271 */ 272 sk->sk_write_space(sk); 273 break; 274 275 case SO_RCVBUF: 276 /* Don't error on this BSD doesn't and if you think 277 about it this is right. Otherwise apps have to 278 play 'guess the biggest size' games. RCVBUF/SNDBUF 279 are treated in BSD as hints */ 280 281 if (val > sysctl_rmem_max) 282 val = sysctl_rmem_max; 283 284 sk->sk_userlocks |= SOCK_RCVBUF_LOCK; 285 /* FIXME: is this lower bound the right one? */ 286 if ((val * 2) < SOCK_MIN_RCVBUF) 287 sk->sk_rcvbuf = SOCK_MIN_RCVBUF; 288 else 289 sk->sk_rcvbuf = val * 2; 290 break; 291 292 case SO_KEEPALIVE: 293 #ifdef CONFIG_INET 294 if (sk->sk_protocol == IPPROTO_TCP) 295 tcp_set_keepalive(sk, valbool); 296 #endif 297 sock_valbool_flag(sk, SOCK_KEEPOPEN, valbool); 298 break; 299 300 case SO_OOBINLINE: 301 sock_valbool_flag(sk, SOCK_URGINLINE, valbool); 302 break; 303 304 case SO_NO_CHECK: 305 sk->sk_no_check = valbool; 306 break; 307 308 case SO_PRIORITY: 309 if ((val >= 0 && val <= 6) || capable(CAP_NET_ADMIN)) 310 sk->sk_priority = val; 311 else 312 ret = -EPERM; 313 break; 314 315 case SO_LINGER: 316 if(optlen<sizeof(ling)) { 317 ret = -EINVAL; /* 1003.1g */ 318 break; 319 } 320 if (copy_from_user(&ling,optval,sizeof(ling))) { 321 ret = -EFAULT; 322 break; 323 } 324 if (!ling.l_onoff) 325 sock_reset_flag(sk, SOCK_LINGER); 326 else { 327 #if (BITS_PER_LONG == 32) 328 if (ling.l_linger >= MAX_SCHEDULE_TIMEOUT/HZ) 329 sk->sk_lingertime = MAX_SCHEDULE_TIMEOUT; 330 else 331 #endif 332 sk->sk_lingertime = ling.l_linger * HZ; 333 sock_set_flag(sk, SOCK_LINGER); 334 } 335 break; 336 337 case SO_BSDCOMPAT: 338 sock_warn_obsolete_bsdism("setsockopt"); 339 break; 340 341 case SO_PASSCRED: 342 if (valbool) 343 set_bit(SOCK_PASSCRED, &sock->flags); 344 else 345 clear_bit(SOCK_PASSCRED, &sock->flags); 346 break; 347 348 case SO_TIMESTAMP: 349 if (valbool) { 350 sock_set_flag(sk, SOCK_RCVTSTAMP); 351 sock_enable_timestamp(sk); 352 } else 353 sock_reset_flag(sk, SOCK_RCVTSTAMP); 354 break; 355 356 case SO_RCVLOWAT: 357 if (val < 0) 358 val = INT_MAX; 359 sk->sk_rcvlowat = val ? : 1; 360 break; 361 362 case SO_RCVTIMEO: 363 ret = sock_set_timeout(&sk->sk_rcvtimeo, optval, optlen); 364 break; 365 366 case SO_SNDTIMEO: 367 ret = sock_set_timeout(&sk->sk_sndtimeo, optval, optlen); 368 break; 369 370 #ifdef CONFIG_NETDEVICES 371 case SO_BINDTODEVICE: 372 { 373 char devname[IFNAMSIZ]; 374 375 /* Sorry... */ 376 if (!capable(CAP_NET_RAW)) { 377 ret = -EPERM; 378 break; 379 } 380 381 /* Bind this socket to a particular device like "eth0", 382 * as specified in the passed interface name. If the 383 * name is "" or the option length is zero the socket 384 * is not bound. 385 */ 386 387 if (!valbool) { 388 sk->sk_bound_dev_if = 0; 389 } else { 390 if (optlen > IFNAMSIZ) 391 optlen = IFNAMSIZ; 392 if (copy_from_user(devname, optval, optlen)) { 393 ret = -EFAULT; 394 break; 395 } 396 397 /* Remove any cached route for this socket. */ 398 sk_dst_reset(sk); 399 400 if (devname[0] == '\0') { 401 sk->sk_bound_dev_if = 0; 402 } else { 403 struct net_device *dev = dev_get_by_name(devname); 404 if (!dev) { 405 ret = -ENODEV; 406 break; 407 } 408 sk->sk_bound_dev_if = dev->ifindex; 409 dev_put(dev); 410 } 411 } 412 break; 413 } 414 #endif 415 416 417 case SO_ATTACH_FILTER: 418 ret = -EINVAL; 419 if (optlen == sizeof(struct sock_fprog)) { 420 struct sock_fprog fprog; 421 422 ret = -EFAULT; 423 if (copy_from_user(&fprog, optval, sizeof(fprog))) 424 break; 425 426 ret = sk_attach_filter(&fprog, sk); 427 } 428 break; 429 430 case SO_DETACH_FILTER: 431 spin_lock_bh(&sk->sk_lock.slock); 432 filter = sk->sk_filter; 433 if (filter) { 434 sk->sk_filter = NULL; 435 spin_unlock_bh(&sk->sk_lock.slock); 436 sk_filter_release(sk, filter); 437 break; 438 } 439 spin_unlock_bh(&sk->sk_lock.slock); 440 ret = -ENONET; 441 break; 442 443 /* We implement the SO_SNDLOWAT etc to 444 not be settable (1003.1g 5.3) */ 445 default: 446 ret = -ENOPROTOOPT; 447 break; 448 } 449 release_sock(sk); 450 return ret; 451 } 452 453 454 int sock_getsockopt(struct socket *sock, int level, int optname, 455 char __user *optval, int __user *optlen) 456 { 457 struct sock *sk = sock->sk; 458 459 union 460 { 461 int val; 462 struct linger ling; 463 struct timeval tm; 464 } v; 465 466 unsigned int lv = sizeof(int); 467 int len; 468 469 if(get_user(len,optlen)) 470 return -EFAULT; 471 if(len < 0) 472 return -EINVAL; 473 474 switch(optname) 475 { 476 case SO_DEBUG: 477 v.val = sock_flag(sk, SOCK_DBG); 478 break; 479 480 case SO_DONTROUTE: 481 v.val = sock_flag(sk, SOCK_LOCALROUTE); 482 break; 483 484 case SO_BROADCAST: 485 v.val = !!sock_flag(sk, SOCK_BROADCAST); 486 break; 487 488 case SO_SNDBUF: 489 v.val = sk->sk_sndbuf; 490 break; 491 492 case SO_RCVBUF: 493 v.val = sk->sk_rcvbuf; 494 break; 495 496 case SO_REUSEADDR: 497 v.val = sk->sk_reuse; 498 break; 499 500 case SO_KEEPALIVE: 501 v.val = !!sock_flag(sk, SOCK_KEEPOPEN); 502 break; 503 504 case SO_TYPE: 505 v.val = sk->sk_type; 506 break; 507 508 case SO_ERROR: 509 v.val = -sock_error(sk); 510 if(v.val==0) 511 v.val = xchg(&sk->sk_err_soft, 0); 512 break; 513 514 case SO_OOBINLINE: 515 v.val = !!sock_flag(sk, SOCK_URGINLINE); 516 break; 517 518 case SO_NO_CHECK: 519 v.val = sk->sk_no_check; 520 break; 521 522 case SO_PRIORITY: 523 v.val = sk->sk_priority; 524 break; 525 526 case SO_LINGER: 527 lv = sizeof(v.ling); 528 v.ling.l_onoff = !!sock_flag(sk, SOCK_LINGER); 529 v.ling.l_linger = sk->sk_lingertime / HZ; 530 break; 531 532 case SO_BSDCOMPAT: 533 sock_warn_obsolete_bsdism("getsockopt"); 534 break; 535 536 case SO_TIMESTAMP: 537 v.val = sock_flag(sk, SOCK_RCVTSTAMP); 538 break; 539 540 case SO_RCVTIMEO: 541 lv=sizeof(struct timeval); 542 if (sk->sk_rcvtimeo == MAX_SCHEDULE_TIMEOUT) { 543 v.tm.tv_sec = 0; 544 v.tm.tv_usec = 0; 545 } else { 546 v.tm.tv_sec = sk->sk_rcvtimeo / HZ; 547 v.tm.tv_usec = ((sk->sk_rcvtimeo % HZ) * 1000000) / HZ; 548 } 549 break; 550 551 case SO_SNDTIMEO: 552 lv=sizeof(struct timeval); 553 if (sk->sk_sndtimeo == MAX_SCHEDULE_TIMEOUT) { 554 v.tm.tv_sec = 0; 555 v.tm.tv_usec = 0; 556 } else { 557 v.tm.tv_sec = sk->sk_sndtimeo / HZ; 558 v.tm.tv_usec = ((sk->sk_sndtimeo % HZ) * 1000000) / HZ; 559 } 560 break; 561 562 case SO_RCVLOWAT: 563 v.val = sk->sk_rcvlowat; 564 break; 565 566 case SO_SNDLOWAT: 567 v.val=1; 568 break; 569 570 case SO_PASSCRED: 571 v.val = test_bit(SOCK_PASSCRED, &sock->flags) ? 1 : 0; 572 break; 573 574 case SO_PEERCRED: 575 if (len > sizeof(sk->sk_peercred)) 576 len = sizeof(sk->sk_peercred); 577 if (copy_to_user(optval, &sk->sk_peercred, len)) 578 return -EFAULT; 579 goto lenout; 580 581 case SO_PEERNAME: 582 { 583 char address[128]; 584 585 if (sock->ops->getname(sock, (struct sockaddr *)address, &lv, 2)) 586 return -ENOTCONN; 587 if (lv < len) 588 return -EINVAL; 589 if (copy_to_user(optval, address, len)) 590 return -EFAULT; 591 goto lenout; 592 } 593 594 /* Dubious BSD thing... Probably nobody even uses it, but 595 * the UNIX standard wants it for whatever reason... -DaveM 596 */ 597 case SO_ACCEPTCONN: 598 v.val = sk->sk_state == TCP_LISTEN; 599 break; 600 601 case SO_PEERSEC: 602 return security_socket_getpeersec(sock, optval, optlen, len); 603 604 default: 605 return(-ENOPROTOOPT); 606 } 607 if (len > lv) 608 len = lv; 609 if (copy_to_user(optval, &v, len)) 610 return -EFAULT; 611 lenout: 612 if (put_user(len, optlen)) 613 return -EFAULT; 614 return 0; 615 } 616 617 /** 618 * sk_alloc - All socket objects are allocated here 619 * @family: protocol family 620 * @priority: for allocation (%GFP_KERNEL, %GFP_ATOMIC, etc) 621 * @prot: struct proto associated with this new sock instance 622 * @zero_it: if we should zero the newly allocated sock 623 */ 624 struct sock *sk_alloc(int family, int priority, struct proto *prot, int zero_it) 625 { 626 struct sock *sk = NULL; 627 kmem_cache_t *slab = prot->slab; 628 629 if (slab != NULL) 630 sk = kmem_cache_alloc(slab, priority); 631 else 632 sk = kmalloc(prot->obj_size, priority); 633 634 if (sk) { 635 if (zero_it) { 636 memset(sk, 0, prot->obj_size); 637 sk->sk_family = family; 638 /* 639 * See comment in struct sock definition to understand 640 * why we need sk_prot_creator -acme 641 */ 642 sk->sk_prot = sk->sk_prot_creator = prot; 643 sock_lock_init(sk); 644 } 645 646 if (security_sk_alloc(sk, family, priority)) { 647 if (slab != NULL) 648 kmem_cache_free(slab, sk); 649 else 650 kfree(sk); 651 sk = NULL; 652 } else 653 __module_get(prot->owner); 654 } 655 return sk; 656 } 657 658 void sk_free(struct sock *sk) 659 { 660 struct sk_filter *filter; 661 struct module *owner = sk->sk_prot_creator->owner; 662 663 if (sk->sk_destruct) 664 sk->sk_destruct(sk); 665 666 filter = sk->sk_filter; 667 if (filter) { 668 sk_filter_release(sk, filter); 669 sk->sk_filter = NULL; 670 } 671 672 sock_disable_timestamp(sk); 673 674 if (atomic_read(&sk->sk_omem_alloc)) 675 printk(KERN_DEBUG "%s: optmem leakage (%d bytes) detected.\n", 676 __FUNCTION__, atomic_read(&sk->sk_omem_alloc)); 677 678 security_sk_free(sk); 679 if (sk->sk_prot_creator->slab != NULL) 680 kmem_cache_free(sk->sk_prot_creator->slab, sk); 681 else 682 kfree(sk); 683 module_put(owner); 684 } 685 686 void __init sk_init(void) 687 { 688 if (num_physpages <= 4096) { 689 sysctl_wmem_max = 32767; 690 sysctl_rmem_max = 32767; 691 sysctl_wmem_default = 32767; 692 sysctl_rmem_default = 32767; 693 } else if (num_physpages >= 131072) { 694 sysctl_wmem_max = 131071; 695 sysctl_rmem_max = 131071; 696 } 697 } 698 699 /* 700 * Simple resource managers for sockets. 701 */ 702 703 704 /* 705 * Write buffer destructor automatically called from kfree_skb. 706 */ 707 void sock_wfree(struct sk_buff *skb) 708 { 709 struct sock *sk = skb->sk; 710 711 /* In case it might be waiting for more memory. */ 712 atomic_sub(skb->truesize, &sk->sk_wmem_alloc); 713 if (!sock_flag(sk, SOCK_USE_WRITE_QUEUE)) 714 sk->sk_write_space(sk); 715 sock_put(sk); 716 } 717 718 /* 719 * Read buffer destructor automatically called from kfree_skb. 720 */ 721 void sock_rfree(struct sk_buff *skb) 722 { 723 struct sock *sk = skb->sk; 724 725 atomic_sub(skb->truesize, &sk->sk_rmem_alloc); 726 } 727 728 729 int sock_i_uid(struct sock *sk) 730 { 731 int uid; 732 733 read_lock(&sk->sk_callback_lock); 734 uid = sk->sk_socket ? SOCK_INODE(sk->sk_socket)->i_uid : 0; 735 read_unlock(&sk->sk_callback_lock); 736 return uid; 737 } 738 739 unsigned long sock_i_ino(struct sock *sk) 740 { 741 unsigned long ino; 742 743 read_lock(&sk->sk_callback_lock); 744 ino = sk->sk_socket ? SOCK_INODE(sk->sk_socket)->i_ino : 0; 745 read_unlock(&sk->sk_callback_lock); 746 return ino; 747 } 748 749 /* 750 * Allocate a skb from the socket's send buffer. 751 */ 752 struct sk_buff *sock_wmalloc(struct sock *sk, unsigned long size, int force, int priority) 753 { 754 if (force || atomic_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf) { 755 struct sk_buff * skb = alloc_skb(size, priority); 756 if (skb) { 757 skb_set_owner_w(skb, sk); 758 return skb; 759 } 760 } 761 return NULL; 762 } 763 764 /* 765 * Allocate a skb from the socket's receive buffer. 766 */ 767 struct sk_buff *sock_rmalloc(struct sock *sk, unsigned long size, int force, int priority) 768 { 769 if (force || atomic_read(&sk->sk_rmem_alloc) < sk->sk_rcvbuf) { 770 struct sk_buff *skb = alloc_skb(size, priority); 771 if (skb) { 772 skb_set_owner_r(skb, sk); 773 return skb; 774 } 775 } 776 return NULL; 777 } 778 779 /* 780 * Allocate a memory block from the socket's option memory buffer. 781 */ 782 void *sock_kmalloc(struct sock *sk, int size, int priority) 783 { 784 if ((unsigned)size <= sysctl_optmem_max && 785 atomic_read(&sk->sk_omem_alloc) + size < sysctl_optmem_max) { 786 void *mem; 787 /* First do the add, to avoid the race if kmalloc 788 * might sleep. 789 */ 790 atomic_add(size, &sk->sk_omem_alloc); 791 mem = kmalloc(size, priority); 792 if (mem) 793 return mem; 794 atomic_sub(size, &sk->sk_omem_alloc); 795 } 796 return NULL; 797 } 798 799 /* 800 * Free an option memory block. 801 */ 802 void sock_kfree_s(struct sock *sk, void *mem, int size) 803 { 804 kfree(mem); 805 atomic_sub(size, &sk->sk_omem_alloc); 806 } 807 808 /* It is almost wait_for_tcp_memory minus release_sock/lock_sock. 809 I think, these locks should be removed for datagram sockets. 810 */ 811 static long sock_wait_for_wmem(struct sock * sk, long timeo) 812 { 813 DEFINE_WAIT(wait); 814 815 clear_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags); 816 for (;;) { 817 if (!timeo) 818 break; 819 if (signal_pending(current)) 820 break; 821 set_bit(SOCK_NOSPACE, &sk->sk_socket->flags); 822 prepare_to_wait(sk->sk_sleep, &wait, TASK_INTERRUPTIBLE); 823 if (atomic_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf) 824 break; 825 if (sk->sk_shutdown & SEND_SHUTDOWN) 826 break; 827 if (sk->sk_err) 828 break; 829 timeo = schedule_timeout(timeo); 830 } 831 finish_wait(sk->sk_sleep, &wait); 832 return timeo; 833 } 834 835 836 /* 837 * Generic send/receive buffer handlers 838 */ 839 840 static struct sk_buff *sock_alloc_send_pskb(struct sock *sk, 841 unsigned long header_len, 842 unsigned long data_len, 843 int noblock, int *errcode) 844 { 845 struct sk_buff *skb; 846 unsigned int gfp_mask; 847 long timeo; 848 int err; 849 850 gfp_mask = sk->sk_allocation; 851 if (gfp_mask & __GFP_WAIT) 852 gfp_mask |= __GFP_REPEAT; 853 854 timeo = sock_sndtimeo(sk, noblock); 855 while (1) { 856 err = sock_error(sk); 857 if (err != 0) 858 goto failure; 859 860 err = -EPIPE; 861 if (sk->sk_shutdown & SEND_SHUTDOWN) 862 goto failure; 863 864 if (atomic_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf) { 865 skb = alloc_skb(header_len, sk->sk_allocation); 866 if (skb) { 867 int npages; 868 int i; 869 870 /* No pages, we're done... */ 871 if (!data_len) 872 break; 873 874 npages = (data_len + (PAGE_SIZE - 1)) >> PAGE_SHIFT; 875 skb->truesize += data_len; 876 skb_shinfo(skb)->nr_frags = npages; 877 for (i = 0; i < npages; i++) { 878 struct page *page; 879 skb_frag_t *frag; 880 881 page = alloc_pages(sk->sk_allocation, 0); 882 if (!page) { 883 err = -ENOBUFS; 884 skb_shinfo(skb)->nr_frags = i; 885 kfree_skb(skb); 886 goto failure; 887 } 888 889 frag = &skb_shinfo(skb)->frags[i]; 890 frag->page = page; 891 frag->page_offset = 0; 892 frag->size = (data_len >= PAGE_SIZE ? 893 PAGE_SIZE : 894 data_len); 895 data_len -= PAGE_SIZE; 896 } 897 898 /* Full success... */ 899 break; 900 } 901 err = -ENOBUFS; 902 goto failure; 903 } 904 set_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags); 905 set_bit(SOCK_NOSPACE, &sk->sk_socket->flags); 906 err = -EAGAIN; 907 if (!timeo) 908 goto failure; 909 if (signal_pending(current)) 910 goto interrupted; 911 timeo = sock_wait_for_wmem(sk, timeo); 912 } 913 914 skb_set_owner_w(skb, sk); 915 return skb; 916 917 interrupted: 918 err = sock_intr_errno(timeo); 919 failure: 920 *errcode = err; 921 return NULL; 922 } 923 924 struct sk_buff *sock_alloc_send_skb(struct sock *sk, unsigned long size, 925 int noblock, int *errcode) 926 { 927 return sock_alloc_send_pskb(sk, size, 0, noblock, errcode); 928 } 929 930 static void __lock_sock(struct sock *sk) 931 { 932 DEFINE_WAIT(wait); 933 934 for(;;) { 935 prepare_to_wait_exclusive(&sk->sk_lock.wq, &wait, 936 TASK_UNINTERRUPTIBLE); 937 spin_unlock_bh(&sk->sk_lock.slock); 938 schedule(); 939 spin_lock_bh(&sk->sk_lock.slock); 940 if(!sock_owned_by_user(sk)) 941 break; 942 } 943 finish_wait(&sk->sk_lock.wq, &wait); 944 } 945 946 static void __release_sock(struct sock *sk) 947 { 948 struct sk_buff *skb = sk->sk_backlog.head; 949 950 do { 951 sk->sk_backlog.head = sk->sk_backlog.tail = NULL; 952 bh_unlock_sock(sk); 953 954 do { 955 struct sk_buff *next = skb->next; 956 957 skb->next = NULL; 958 sk->sk_backlog_rcv(sk, skb); 959 960 /* 961 * We are in process context here with softirqs 962 * disabled, use cond_resched_softirq() to preempt. 963 * This is safe to do because we've taken the backlog 964 * queue private: 965 */ 966 cond_resched_softirq(); 967 968 skb = next; 969 } while (skb != NULL); 970 971 bh_lock_sock(sk); 972 } while((skb = sk->sk_backlog.head) != NULL); 973 } 974 975 /** 976 * sk_wait_data - wait for data to arrive at sk_receive_queue 977 * @sk: sock to wait on 978 * @timeo: for how long 979 * 980 * Now socket state including sk->sk_err is changed only under lock, 981 * hence we may omit checks after joining wait queue. 982 * We check receive queue before schedule() only as optimization; 983 * it is very likely that release_sock() added new data. 984 */ 985 int sk_wait_data(struct sock *sk, long *timeo) 986 { 987 int rc; 988 DEFINE_WAIT(wait); 989 990 prepare_to_wait(sk->sk_sleep, &wait, TASK_INTERRUPTIBLE); 991 set_bit(SOCK_ASYNC_WAITDATA, &sk->sk_socket->flags); 992 rc = sk_wait_event(sk, timeo, !skb_queue_empty(&sk->sk_receive_queue)); 993 clear_bit(SOCK_ASYNC_WAITDATA, &sk->sk_socket->flags); 994 finish_wait(sk->sk_sleep, &wait); 995 return rc; 996 } 997 998 EXPORT_SYMBOL(sk_wait_data); 999 1000 /* 1001 * Set of default routines for initialising struct proto_ops when 1002 * the protocol does not support a particular function. In certain 1003 * cases where it makes no sense for a protocol to have a "do nothing" 1004 * function, some default processing is provided. 1005 */ 1006 1007 int sock_no_bind(struct socket *sock, struct sockaddr *saddr, int len) 1008 { 1009 return -EOPNOTSUPP; 1010 } 1011 1012 int sock_no_connect(struct socket *sock, struct sockaddr *saddr, 1013 int len, int flags) 1014 { 1015 return -EOPNOTSUPP; 1016 } 1017 1018 int sock_no_socketpair(struct socket *sock1, struct socket *sock2) 1019 { 1020 return -EOPNOTSUPP; 1021 } 1022 1023 int sock_no_accept(struct socket *sock, struct socket *newsock, int flags) 1024 { 1025 return -EOPNOTSUPP; 1026 } 1027 1028 int sock_no_getname(struct socket *sock, struct sockaddr *saddr, 1029 int *len, int peer) 1030 { 1031 return -EOPNOTSUPP; 1032 } 1033 1034 unsigned int sock_no_poll(struct file * file, struct socket *sock, poll_table *pt) 1035 { 1036 return 0; 1037 } 1038 1039 int sock_no_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg) 1040 { 1041 return -EOPNOTSUPP; 1042 } 1043 1044 int sock_no_listen(struct socket *sock, int backlog) 1045 { 1046 return -EOPNOTSUPP; 1047 } 1048 1049 int sock_no_shutdown(struct socket *sock, int how) 1050 { 1051 return -EOPNOTSUPP; 1052 } 1053 1054 int sock_no_setsockopt(struct socket *sock, int level, int optname, 1055 char __user *optval, int optlen) 1056 { 1057 return -EOPNOTSUPP; 1058 } 1059 1060 int sock_no_getsockopt(struct socket *sock, int level, int optname, 1061 char __user *optval, int __user *optlen) 1062 { 1063 return -EOPNOTSUPP; 1064 } 1065 1066 int sock_no_sendmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *m, 1067 size_t len) 1068 { 1069 return -EOPNOTSUPP; 1070 } 1071 1072 int sock_no_recvmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *m, 1073 size_t len, int flags) 1074 { 1075 return -EOPNOTSUPP; 1076 } 1077 1078 int sock_no_mmap(struct file *file, struct socket *sock, struct vm_area_struct *vma) 1079 { 1080 /* Mirror missing mmap method error code */ 1081 return -ENODEV; 1082 } 1083 1084 ssize_t sock_no_sendpage(struct socket *sock, struct page *page, int offset, size_t size, int flags) 1085 { 1086 ssize_t res; 1087 struct msghdr msg = {.msg_flags = flags}; 1088 struct kvec iov; 1089 char *kaddr = kmap(page); 1090 iov.iov_base = kaddr + offset; 1091 iov.iov_len = size; 1092 res = kernel_sendmsg(sock, &msg, &iov, 1, size); 1093 kunmap(page); 1094 return res; 1095 } 1096 1097 /* 1098 * Default Socket Callbacks 1099 */ 1100 1101 static void sock_def_wakeup(struct sock *sk) 1102 { 1103 read_lock(&sk->sk_callback_lock); 1104 if (sk->sk_sleep && waitqueue_active(sk->sk_sleep)) 1105 wake_up_interruptible_all(sk->sk_sleep); 1106 read_unlock(&sk->sk_callback_lock); 1107 } 1108 1109 static void sock_def_error_report(struct sock *sk) 1110 { 1111 read_lock(&sk->sk_callback_lock); 1112 if (sk->sk_sleep && waitqueue_active(sk->sk_sleep)) 1113 wake_up_interruptible(sk->sk_sleep); 1114 sk_wake_async(sk,0,POLL_ERR); 1115 read_unlock(&sk->sk_callback_lock); 1116 } 1117 1118 static void sock_def_readable(struct sock *sk, int len) 1119 { 1120 read_lock(&sk->sk_callback_lock); 1121 if (sk->sk_sleep && waitqueue_active(sk->sk_sleep)) 1122 wake_up_interruptible(sk->sk_sleep); 1123 sk_wake_async(sk,1,POLL_IN); 1124 read_unlock(&sk->sk_callback_lock); 1125 } 1126 1127 static void sock_def_write_space(struct sock *sk) 1128 { 1129 read_lock(&sk->sk_callback_lock); 1130 1131 /* Do not wake up a writer until he can make "significant" 1132 * progress. --DaveM 1133 */ 1134 if((atomic_read(&sk->sk_wmem_alloc) << 1) <= sk->sk_sndbuf) { 1135 if (sk->sk_sleep && waitqueue_active(sk->sk_sleep)) 1136 wake_up_interruptible(sk->sk_sleep); 1137 1138 /* Should agree with poll, otherwise some programs break */ 1139 if (sock_writeable(sk)) 1140 sk_wake_async(sk, 2, POLL_OUT); 1141 } 1142 1143 read_unlock(&sk->sk_callback_lock); 1144 } 1145 1146 static void sock_def_destruct(struct sock *sk) 1147 { 1148 if (sk->sk_protinfo) 1149 kfree(sk->sk_protinfo); 1150 } 1151 1152 void sk_send_sigurg(struct sock *sk) 1153 { 1154 if (sk->sk_socket && sk->sk_socket->file) 1155 if (send_sigurg(&sk->sk_socket->file->f_owner)) 1156 sk_wake_async(sk, 3, POLL_PRI); 1157 } 1158 1159 void sk_reset_timer(struct sock *sk, struct timer_list* timer, 1160 unsigned long expires) 1161 { 1162 if (!mod_timer(timer, expires)) 1163 sock_hold(sk); 1164 } 1165 1166 EXPORT_SYMBOL(sk_reset_timer); 1167 1168 void sk_stop_timer(struct sock *sk, struct timer_list* timer) 1169 { 1170 if (timer_pending(timer) && del_timer(timer)) 1171 __sock_put(sk); 1172 } 1173 1174 EXPORT_SYMBOL(sk_stop_timer); 1175 1176 void sock_init_data(struct socket *sock, struct sock *sk) 1177 { 1178 skb_queue_head_init(&sk->sk_receive_queue); 1179 skb_queue_head_init(&sk->sk_write_queue); 1180 skb_queue_head_init(&sk->sk_error_queue); 1181 1182 sk->sk_send_head = NULL; 1183 1184 init_timer(&sk->sk_timer); 1185 1186 sk->sk_allocation = GFP_KERNEL; 1187 sk->sk_rcvbuf = sysctl_rmem_default; 1188 sk->sk_sndbuf = sysctl_wmem_default; 1189 sk->sk_state = TCP_CLOSE; 1190 sk->sk_socket = sock; 1191 1192 sock_set_flag(sk, SOCK_ZAPPED); 1193 1194 if(sock) 1195 { 1196 sk->sk_type = sock->type; 1197 sk->sk_sleep = &sock->wait; 1198 sock->sk = sk; 1199 } else 1200 sk->sk_sleep = NULL; 1201 1202 rwlock_init(&sk->sk_dst_lock); 1203 rwlock_init(&sk->sk_callback_lock); 1204 1205 sk->sk_state_change = sock_def_wakeup; 1206 sk->sk_data_ready = sock_def_readable; 1207 sk->sk_write_space = sock_def_write_space; 1208 sk->sk_error_report = sock_def_error_report; 1209 sk->sk_destruct = sock_def_destruct; 1210 1211 sk->sk_sndmsg_page = NULL; 1212 sk->sk_sndmsg_off = 0; 1213 1214 sk->sk_peercred.pid = 0; 1215 sk->sk_peercred.uid = -1; 1216 sk->sk_peercred.gid = -1; 1217 sk->sk_write_pending = 0; 1218 sk->sk_rcvlowat = 1; 1219 sk->sk_rcvtimeo = MAX_SCHEDULE_TIMEOUT; 1220 sk->sk_sndtimeo = MAX_SCHEDULE_TIMEOUT; 1221 1222 sk->sk_stamp.tv_sec = -1L; 1223 sk->sk_stamp.tv_usec = -1L; 1224 1225 atomic_set(&sk->sk_refcnt, 1); 1226 } 1227 1228 void fastcall lock_sock(struct sock *sk) 1229 { 1230 might_sleep(); 1231 spin_lock_bh(&(sk->sk_lock.slock)); 1232 if (sk->sk_lock.owner) 1233 __lock_sock(sk); 1234 sk->sk_lock.owner = (void *)1; 1235 spin_unlock_bh(&(sk->sk_lock.slock)); 1236 } 1237 1238 EXPORT_SYMBOL(lock_sock); 1239 1240 void fastcall release_sock(struct sock *sk) 1241 { 1242 spin_lock_bh(&(sk->sk_lock.slock)); 1243 if (sk->sk_backlog.tail) 1244 __release_sock(sk); 1245 sk->sk_lock.owner = NULL; 1246 if (waitqueue_active(&(sk->sk_lock.wq))) 1247 wake_up(&(sk->sk_lock.wq)); 1248 spin_unlock_bh(&(sk->sk_lock.slock)); 1249 } 1250 EXPORT_SYMBOL(release_sock); 1251 1252 int sock_get_timestamp(struct sock *sk, struct timeval __user *userstamp) 1253 { 1254 if (!sock_flag(sk, SOCK_TIMESTAMP)) 1255 sock_enable_timestamp(sk); 1256 if (sk->sk_stamp.tv_sec == -1) 1257 return -ENOENT; 1258 if (sk->sk_stamp.tv_sec == 0) 1259 do_gettimeofday(&sk->sk_stamp); 1260 return copy_to_user(userstamp, &sk->sk_stamp, sizeof(struct timeval)) ? 1261 -EFAULT : 0; 1262 } 1263 EXPORT_SYMBOL(sock_get_timestamp); 1264 1265 void sock_enable_timestamp(struct sock *sk) 1266 { 1267 if (!sock_flag(sk, SOCK_TIMESTAMP)) { 1268 sock_set_flag(sk, SOCK_TIMESTAMP); 1269 net_enable_timestamp(); 1270 } 1271 } 1272 EXPORT_SYMBOL(sock_enable_timestamp); 1273 1274 /* 1275 * Get a socket option on an socket. 1276 * 1277 * FIX: POSIX 1003.1g is very ambiguous here. It states that 1278 * asynchronous errors should be reported by getsockopt. We assume 1279 * this means if you specify SO_ERROR (otherwise whats the point of it). 1280 */ 1281 int sock_common_getsockopt(struct socket *sock, int level, int optname, 1282 char __user *optval, int __user *optlen) 1283 { 1284 struct sock *sk = sock->sk; 1285 1286 return sk->sk_prot->getsockopt(sk, level, optname, optval, optlen); 1287 } 1288 1289 EXPORT_SYMBOL(sock_common_getsockopt); 1290 1291 int sock_common_recvmsg(struct kiocb *iocb, struct socket *sock, 1292 struct msghdr *msg, size_t size, int flags) 1293 { 1294 struct sock *sk = sock->sk; 1295 int addr_len = 0; 1296 int err; 1297 1298 err = sk->sk_prot->recvmsg(iocb, sk, msg, size, flags & MSG_DONTWAIT, 1299 flags & ~MSG_DONTWAIT, &addr_len); 1300 if (err >= 0) 1301 msg->msg_namelen = addr_len; 1302 return err; 1303 } 1304 1305 EXPORT_SYMBOL(sock_common_recvmsg); 1306 1307 /* 1308 * Set socket options on an inet socket. 1309 */ 1310 int sock_common_setsockopt(struct socket *sock, int level, int optname, 1311 char __user *optval, int optlen) 1312 { 1313 struct sock *sk = sock->sk; 1314 1315 return sk->sk_prot->setsockopt(sk, level, optname, optval, optlen); 1316 } 1317 1318 EXPORT_SYMBOL(sock_common_setsockopt); 1319 1320 void sk_common_release(struct sock *sk) 1321 { 1322 if (sk->sk_prot->destroy) 1323 sk->sk_prot->destroy(sk); 1324 1325 /* 1326 * Observation: when sock_common_release is called, processes have 1327 * no access to socket. But net still has. 1328 * Step one, detach it from networking: 1329 * 1330 * A. Remove from hash tables. 1331 */ 1332 1333 sk->sk_prot->unhash(sk); 1334 1335 /* 1336 * In this point socket cannot receive new packets, but it is possible 1337 * that some packets are in flight because some CPU runs receiver and 1338 * did hash table lookup before we unhashed socket. They will achieve 1339 * receive queue and will be purged by socket destructor. 1340 * 1341 * Also we still have packets pending on receive queue and probably, 1342 * our own packets waiting in device queues. sock_destroy will drain 1343 * receive queue, but transmitted packets will delay socket destruction 1344 * until the last reference will be released. 1345 */ 1346 1347 sock_orphan(sk); 1348 1349 xfrm_sk_free_policy(sk); 1350 1351 #ifdef INET_REFCNT_DEBUG 1352 if (atomic_read(&sk->sk_refcnt) != 1) 1353 printk(KERN_DEBUG "Destruction of the socket %p delayed, c=%d\n", 1354 sk, atomic_read(&sk->sk_refcnt)); 1355 #endif 1356 sock_put(sk); 1357 } 1358 1359 EXPORT_SYMBOL(sk_common_release); 1360 1361 static DEFINE_RWLOCK(proto_list_lock); 1362 static LIST_HEAD(proto_list); 1363 1364 int proto_register(struct proto *prot, int alloc_slab) 1365 { 1366 int rc = -ENOBUFS; 1367 1368 if (alloc_slab) { 1369 prot->slab = kmem_cache_create(prot->name, prot->obj_size, 0, 1370 SLAB_HWCACHE_ALIGN, NULL, NULL); 1371 1372 if (prot->slab == NULL) { 1373 printk(KERN_CRIT "%s: Can't create sock SLAB cache!\n", 1374 prot->name); 1375 goto out; 1376 } 1377 } 1378 1379 write_lock(&proto_list_lock); 1380 list_add(&prot->node, &proto_list); 1381 write_unlock(&proto_list_lock); 1382 rc = 0; 1383 out: 1384 return rc; 1385 } 1386 1387 EXPORT_SYMBOL(proto_register); 1388 1389 void proto_unregister(struct proto *prot) 1390 { 1391 write_lock(&proto_list_lock); 1392 1393 if (prot->slab != NULL) { 1394 kmem_cache_destroy(prot->slab); 1395 prot->slab = NULL; 1396 } 1397 1398 list_del(&prot->node); 1399 write_unlock(&proto_list_lock); 1400 } 1401 1402 EXPORT_SYMBOL(proto_unregister); 1403 1404 #ifdef CONFIG_PROC_FS 1405 static inline struct proto *__proto_head(void) 1406 { 1407 return list_entry(proto_list.next, struct proto, node); 1408 } 1409 1410 static inline struct proto *proto_head(void) 1411 { 1412 return list_empty(&proto_list) ? NULL : __proto_head(); 1413 } 1414 1415 static inline struct proto *proto_next(struct proto *proto) 1416 { 1417 return proto->node.next == &proto_list ? NULL : 1418 list_entry(proto->node.next, struct proto, node); 1419 } 1420 1421 static inline struct proto *proto_get_idx(loff_t pos) 1422 { 1423 struct proto *proto; 1424 loff_t i = 0; 1425 1426 list_for_each_entry(proto, &proto_list, node) 1427 if (i++ == pos) 1428 goto out; 1429 1430 proto = NULL; 1431 out: 1432 return proto; 1433 } 1434 1435 static void *proto_seq_start(struct seq_file *seq, loff_t *pos) 1436 { 1437 read_lock(&proto_list_lock); 1438 return *pos ? proto_get_idx(*pos - 1) : SEQ_START_TOKEN; 1439 } 1440 1441 static void *proto_seq_next(struct seq_file *seq, void *v, loff_t *pos) 1442 { 1443 ++*pos; 1444 return v == SEQ_START_TOKEN ? proto_head() : proto_next(v); 1445 } 1446 1447 static void proto_seq_stop(struct seq_file *seq, void *v) 1448 { 1449 read_unlock(&proto_list_lock); 1450 } 1451 1452 static char proto_method_implemented(const void *method) 1453 { 1454 return method == NULL ? 'n' : 'y'; 1455 } 1456 1457 static void proto_seq_printf(struct seq_file *seq, struct proto *proto) 1458 { 1459 seq_printf(seq, "%-9s %4u %6d %6d %-3s %6u %-3s %-10s " 1460 "%2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c\n", 1461 proto->name, 1462 proto->obj_size, 1463 proto->sockets_allocated != NULL ? atomic_read(proto->sockets_allocated) : -1, 1464 proto->memory_allocated != NULL ? atomic_read(proto->memory_allocated) : -1, 1465 proto->memory_pressure != NULL ? *proto->memory_pressure ? "yes" : "no" : "NI", 1466 proto->max_header, 1467 proto->slab == NULL ? "no" : "yes", 1468 module_name(proto->owner), 1469 proto_method_implemented(proto->close), 1470 proto_method_implemented(proto->connect), 1471 proto_method_implemented(proto->disconnect), 1472 proto_method_implemented(proto->accept), 1473 proto_method_implemented(proto->ioctl), 1474 proto_method_implemented(proto->init), 1475 proto_method_implemented(proto->destroy), 1476 proto_method_implemented(proto->shutdown), 1477 proto_method_implemented(proto->setsockopt), 1478 proto_method_implemented(proto->getsockopt), 1479 proto_method_implemented(proto->sendmsg), 1480 proto_method_implemented(proto->recvmsg), 1481 proto_method_implemented(proto->sendpage), 1482 proto_method_implemented(proto->bind), 1483 proto_method_implemented(proto->backlog_rcv), 1484 proto_method_implemented(proto->hash), 1485 proto_method_implemented(proto->unhash), 1486 proto_method_implemented(proto->get_port), 1487 proto_method_implemented(proto->enter_memory_pressure)); 1488 } 1489 1490 static int proto_seq_show(struct seq_file *seq, void *v) 1491 { 1492 if (v == SEQ_START_TOKEN) 1493 seq_printf(seq, "%-9s %-4s %-8s %-6s %-5s %-7s %-4s %-10s %s", 1494 "protocol", 1495 "size", 1496 "sockets", 1497 "memory", 1498 "press", 1499 "maxhdr", 1500 "slab", 1501 "module", 1502 "cl co di ac io in de sh ss gs se re sp bi br ha uh gp em\n"); 1503 else 1504 proto_seq_printf(seq, v); 1505 return 0; 1506 } 1507 1508 static struct seq_operations proto_seq_ops = { 1509 .start = proto_seq_start, 1510 .next = proto_seq_next, 1511 .stop = proto_seq_stop, 1512 .show = proto_seq_show, 1513 }; 1514 1515 static int proto_seq_open(struct inode *inode, struct file *file) 1516 { 1517 return seq_open(file, &proto_seq_ops); 1518 } 1519 1520 static struct file_operations proto_seq_fops = { 1521 .owner = THIS_MODULE, 1522 .open = proto_seq_open, 1523 .read = seq_read, 1524 .llseek = seq_lseek, 1525 .release = seq_release, 1526 }; 1527 1528 static int __init proto_init(void) 1529 { 1530 /* register /proc/net/protocols */ 1531 return proc_net_fops_create("protocols", S_IRUGO, &proto_seq_fops) == NULL ? -ENOBUFS : 0; 1532 } 1533 1534 subsys_initcall(proto_init); 1535 1536 #endif /* PROC_FS */ 1537 1538 EXPORT_SYMBOL(sk_alloc); 1539 EXPORT_SYMBOL(sk_free); 1540 EXPORT_SYMBOL(sk_send_sigurg); 1541 EXPORT_SYMBOL(sock_alloc_send_skb); 1542 EXPORT_SYMBOL(sock_init_data); 1543 EXPORT_SYMBOL(sock_kfree_s); 1544 EXPORT_SYMBOL(sock_kmalloc); 1545 EXPORT_SYMBOL(sock_no_accept); 1546 EXPORT_SYMBOL(sock_no_bind); 1547 EXPORT_SYMBOL(sock_no_connect); 1548 EXPORT_SYMBOL(sock_no_getname); 1549 EXPORT_SYMBOL(sock_no_getsockopt); 1550 EXPORT_SYMBOL(sock_no_ioctl); 1551 EXPORT_SYMBOL(sock_no_listen); 1552 EXPORT_SYMBOL(sock_no_mmap); 1553 EXPORT_SYMBOL(sock_no_poll); 1554 EXPORT_SYMBOL(sock_no_recvmsg); 1555 EXPORT_SYMBOL(sock_no_sendmsg); 1556 EXPORT_SYMBOL(sock_no_sendpage); 1557 EXPORT_SYMBOL(sock_no_setsockopt); 1558 EXPORT_SYMBOL(sock_no_shutdown); 1559 EXPORT_SYMBOL(sock_no_socketpair); 1560 EXPORT_SYMBOL(sock_rfree); 1561 EXPORT_SYMBOL(sock_setsockopt); 1562 EXPORT_SYMBOL(sock_wfree); 1563 EXPORT_SYMBOL(sock_wmalloc); 1564 EXPORT_SYMBOL(sock_i_uid); 1565 EXPORT_SYMBOL(sock_i_ino); 1566 #ifdef CONFIG_SYSCTL 1567 EXPORT_SYMBOL(sysctl_optmem_max); 1568 EXPORT_SYMBOL(sysctl_rmem_max); 1569 EXPORT_SYMBOL(sysctl_wmem_max); 1570 #endif 1571