Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | * |
Jesper Juhl | 02c30a8 | 2005-05-05 16:16:16 -0700 | [diff] [blame] | 12 | * Authors: Ross Biro |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | |
Randy Dunlap | 4fc268d | 2006-01-11 12:17:47 -0800 | [diff] [blame] | 94 | #include <linux/capability.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 95 | #include <linux/config.h> |
| 96 | #include <linux/errno.h> |
| 97 | #include <linux/types.h> |
| 98 | #include <linux/socket.h> |
| 99 | #include <linux/in.h> |
| 100 | #include <linux/kernel.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 101 | #include <linux/module.h> |
| 102 | #include <linux/proc_fs.h> |
| 103 | #include <linux/seq_file.h> |
| 104 | #include <linux/sched.h> |
| 105 | #include <linux/timer.h> |
| 106 | #include <linux/string.h> |
| 107 | #include <linux/sockios.h> |
| 108 | #include <linux/net.h> |
| 109 | #include <linux/mm.h> |
| 110 | #include <linux/slab.h> |
| 111 | #include <linux/interrupt.h> |
| 112 | #include <linux/poll.h> |
| 113 | #include <linux/tcp.h> |
| 114 | #include <linux/init.h> |
| 115 | |
| 116 | #include <asm/uaccess.h> |
| 117 | #include <asm/system.h> |
| 118 | |
| 119 | #include <linux/netdevice.h> |
| 120 | #include <net/protocol.h> |
| 121 | #include <linux/skbuff.h> |
Arnaldo Carvalho de Melo | 2e6599c | 2005-06-18 22:46:52 -0700 | [diff] [blame] | 122 | #include <net/request_sock.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 123 | #include <net/sock.h> |
| 124 | #include <net/xfrm.h> |
| 125 | #include <linux/ipsec.h> |
| 126 | |
| 127 | #include <linux/filter.h> |
| 128 | |
| 129 | #ifdef CONFIG_INET |
| 130 | #include <net/tcp.h> |
| 131 | #endif |
| 132 | |
| 133 | /* Take into consideration the size of the struct sk_buff overhead in the |
| 134 | * determination of these values, since that is non-constant across |
| 135 | * platforms. This makes socket queueing behavior and performance |
| 136 | * not depend upon such differences. |
| 137 | */ |
| 138 | #define _SK_MEM_PACKETS 256 |
| 139 | #define _SK_MEM_OVERHEAD (sizeof(struct sk_buff) + 256) |
| 140 | #define SK_WMEM_MAX (_SK_MEM_OVERHEAD * _SK_MEM_PACKETS) |
| 141 | #define SK_RMEM_MAX (_SK_MEM_OVERHEAD * _SK_MEM_PACKETS) |
| 142 | |
| 143 | /* Run time adjustable parameters. */ |
| 144 | __u32 sysctl_wmem_max = SK_WMEM_MAX; |
| 145 | __u32 sysctl_rmem_max = SK_RMEM_MAX; |
| 146 | __u32 sysctl_wmem_default = SK_WMEM_MAX; |
| 147 | __u32 sysctl_rmem_default = SK_RMEM_MAX; |
| 148 | |
| 149 | /* Maximal space eaten by iovec or ancilliary data plus some space */ |
| 150 | int sysctl_optmem_max = sizeof(unsigned long)*(2*UIO_MAXIOV + 512); |
| 151 | |
| 152 | static int sock_set_timeout(long *timeo_p, char __user *optval, int optlen) |
| 153 | { |
| 154 | struct timeval tv; |
| 155 | |
| 156 | if (optlen < sizeof(tv)) |
| 157 | return -EINVAL; |
| 158 | if (copy_from_user(&tv, optval, sizeof(tv))) |
| 159 | return -EFAULT; |
| 160 | |
| 161 | *timeo_p = MAX_SCHEDULE_TIMEOUT; |
| 162 | if (tv.tv_sec == 0 && tv.tv_usec == 0) |
| 163 | return 0; |
| 164 | if (tv.tv_sec < (MAX_SCHEDULE_TIMEOUT/HZ - 1)) |
| 165 | *timeo_p = tv.tv_sec*HZ + (tv.tv_usec+(1000000/HZ-1))/(1000000/HZ); |
| 166 | return 0; |
| 167 | } |
| 168 | |
| 169 | static void sock_warn_obsolete_bsdism(const char *name) |
| 170 | { |
| 171 | static int warned; |
| 172 | static char warncomm[TASK_COMM_LEN]; |
| 173 | if (strcmp(warncomm, current->comm) && warned < 5) { |
| 174 | strcpy(warncomm, current->comm); |
| 175 | printk(KERN_WARNING "process `%s' is using obsolete " |
| 176 | "%s SO_BSDCOMPAT\n", warncomm, name); |
| 177 | warned++; |
| 178 | } |
| 179 | } |
| 180 | |
| 181 | static void sock_disable_timestamp(struct sock *sk) |
| 182 | { |
| 183 | if (sock_flag(sk, SOCK_TIMESTAMP)) { |
| 184 | sock_reset_flag(sk, SOCK_TIMESTAMP); |
| 185 | net_disable_timestamp(); |
| 186 | } |
| 187 | } |
| 188 | |
| 189 | |
| 190 | /* |
| 191 | * This is meant for all protocols to use and covers goings on |
| 192 | * at the socket level. Everything here is generic. |
| 193 | */ |
| 194 | |
| 195 | int sock_setsockopt(struct socket *sock, int level, int optname, |
| 196 | char __user *optval, int optlen) |
| 197 | { |
| 198 | struct sock *sk=sock->sk; |
| 199 | struct sk_filter *filter; |
| 200 | int val; |
| 201 | int valbool; |
| 202 | struct linger ling; |
| 203 | int ret = 0; |
| 204 | |
| 205 | /* |
| 206 | * Options without arguments |
| 207 | */ |
| 208 | |
| 209 | #ifdef SO_DONTLINGER /* Compatibility item... */ |
Kyle Moffett | a77be81 | 2005-07-27 14:22:30 -0700 | [diff] [blame] | 210 | if (optname == SO_DONTLINGER) { |
| 211 | lock_sock(sk); |
| 212 | sock_reset_flag(sk, SOCK_LINGER); |
| 213 | release_sock(sk); |
| 214 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 215 | } |
Kyle Moffett | a77be81 | 2005-07-27 14:22:30 -0700 | [diff] [blame] | 216 | #endif |
| 217 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 218 | if(optlen<sizeof(int)) |
| 219 | return(-EINVAL); |
| 220 | |
| 221 | if (get_user(val, (int __user *)optval)) |
| 222 | return -EFAULT; |
| 223 | |
| 224 | valbool = val?1:0; |
| 225 | |
| 226 | lock_sock(sk); |
| 227 | |
| 228 | switch(optname) |
| 229 | { |
| 230 | case SO_DEBUG: |
| 231 | if(val && !capable(CAP_NET_ADMIN)) |
| 232 | { |
| 233 | ret = -EACCES; |
| 234 | } |
| 235 | else if (valbool) |
| 236 | sock_set_flag(sk, SOCK_DBG); |
| 237 | else |
| 238 | sock_reset_flag(sk, SOCK_DBG); |
| 239 | break; |
| 240 | case SO_REUSEADDR: |
| 241 | sk->sk_reuse = valbool; |
| 242 | break; |
| 243 | case SO_TYPE: |
| 244 | case SO_ERROR: |
| 245 | ret = -ENOPROTOOPT; |
| 246 | break; |
| 247 | case SO_DONTROUTE: |
| 248 | if (valbool) |
| 249 | sock_set_flag(sk, SOCK_LOCALROUTE); |
| 250 | else |
| 251 | sock_reset_flag(sk, SOCK_LOCALROUTE); |
| 252 | break; |
| 253 | case SO_BROADCAST: |
| 254 | sock_valbool_flag(sk, SOCK_BROADCAST, valbool); |
| 255 | break; |
| 256 | case SO_SNDBUF: |
| 257 | /* Don't error on this BSD doesn't and if you think |
| 258 | about it this is right. Otherwise apps have to |
| 259 | play 'guess the biggest size' games. RCVBUF/SNDBUF |
| 260 | are treated in BSD as hints */ |
| 261 | |
| 262 | if (val > sysctl_wmem_max) |
| 263 | val = sysctl_wmem_max; |
Patrick McHardy | b0573de | 2005-08-09 19:30:51 -0700 | [diff] [blame] | 264 | set_sndbuf: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 265 | sk->sk_userlocks |= SOCK_SNDBUF_LOCK; |
| 266 | if ((val * 2) < SOCK_MIN_SNDBUF) |
| 267 | sk->sk_sndbuf = SOCK_MIN_SNDBUF; |
| 268 | else |
| 269 | sk->sk_sndbuf = val * 2; |
| 270 | |
| 271 | /* |
| 272 | * Wake up sending tasks if we |
| 273 | * upped the value. |
| 274 | */ |
| 275 | sk->sk_write_space(sk); |
| 276 | break; |
| 277 | |
Patrick McHardy | b0573de | 2005-08-09 19:30:51 -0700 | [diff] [blame] | 278 | case SO_SNDBUFFORCE: |
| 279 | if (!capable(CAP_NET_ADMIN)) { |
| 280 | ret = -EPERM; |
| 281 | break; |
| 282 | } |
| 283 | goto set_sndbuf; |
| 284 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 285 | case SO_RCVBUF: |
| 286 | /* Don't error on this BSD doesn't and if you think |
| 287 | about it this is right. Otherwise apps have to |
| 288 | play 'guess the biggest size' games. RCVBUF/SNDBUF |
| 289 | are treated in BSD as hints */ |
| 290 | |
| 291 | if (val > sysctl_rmem_max) |
| 292 | val = sysctl_rmem_max; |
Patrick McHardy | b0573de | 2005-08-09 19:30:51 -0700 | [diff] [blame] | 293 | set_rcvbuf: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 294 | sk->sk_userlocks |= SOCK_RCVBUF_LOCK; |
| 295 | /* FIXME: is this lower bound the right one? */ |
| 296 | if ((val * 2) < SOCK_MIN_RCVBUF) |
| 297 | sk->sk_rcvbuf = SOCK_MIN_RCVBUF; |
| 298 | else |
| 299 | sk->sk_rcvbuf = val * 2; |
| 300 | break; |
| 301 | |
Patrick McHardy | b0573de | 2005-08-09 19:30:51 -0700 | [diff] [blame] | 302 | case SO_RCVBUFFORCE: |
| 303 | if (!capable(CAP_NET_ADMIN)) { |
| 304 | ret = -EPERM; |
| 305 | break; |
| 306 | } |
| 307 | goto set_rcvbuf; |
| 308 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 309 | case SO_KEEPALIVE: |
| 310 | #ifdef CONFIG_INET |
| 311 | if (sk->sk_protocol == IPPROTO_TCP) |
| 312 | tcp_set_keepalive(sk, valbool); |
| 313 | #endif |
| 314 | sock_valbool_flag(sk, SOCK_KEEPOPEN, valbool); |
| 315 | break; |
| 316 | |
| 317 | case SO_OOBINLINE: |
| 318 | sock_valbool_flag(sk, SOCK_URGINLINE, valbool); |
| 319 | break; |
| 320 | |
| 321 | case SO_NO_CHECK: |
| 322 | sk->sk_no_check = valbool; |
| 323 | break; |
| 324 | |
| 325 | case SO_PRIORITY: |
| 326 | if ((val >= 0 && val <= 6) || capable(CAP_NET_ADMIN)) |
| 327 | sk->sk_priority = val; |
| 328 | else |
| 329 | ret = -EPERM; |
| 330 | break; |
| 331 | |
| 332 | case SO_LINGER: |
| 333 | if(optlen<sizeof(ling)) { |
| 334 | ret = -EINVAL; /* 1003.1g */ |
| 335 | break; |
| 336 | } |
| 337 | if (copy_from_user(&ling,optval,sizeof(ling))) { |
| 338 | ret = -EFAULT; |
| 339 | break; |
| 340 | } |
| 341 | if (!ling.l_onoff) |
| 342 | sock_reset_flag(sk, SOCK_LINGER); |
| 343 | else { |
| 344 | #if (BITS_PER_LONG == 32) |
Eric Dumazet | 9261c9b | 2005-09-06 14:51:39 -0700 | [diff] [blame] | 345 | if ((unsigned int)ling.l_linger >= MAX_SCHEDULE_TIMEOUT/HZ) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 346 | sk->sk_lingertime = MAX_SCHEDULE_TIMEOUT; |
| 347 | else |
| 348 | #endif |
Eric Dumazet | 9261c9b | 2005-09-06 14:51:39 -0700 | [diff] [blame] | 349 | sk->sk_lingertime = (unsigned int)ling.l_linger * HZ; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 350 | sock_set_flag(sk, SOCK_LINGER); |
| 351 | } |
| 352 | break; |
| 353 | |
| 354 | case SO_BSDCOMPAT: |
| 355 | sock_warn_obsolete_bsdism("setsockopt"); |
| 356 | break; |
| 357 | |
| 358 | case SO_PASSCRED: |
| 359 | if (valbool) |
| 360 | set_bit(SOCK_PASSCRED, &sock->flags); |
| 361 | else |
| 362 | clear_bit(SOCK_PASSCRED, &sock->flags); |
| 363 | break; |
| 364 | |
| 365 | case SO_TIMESTAMP: |
| 366 | if (valbool) { |
| 367 | sock_set_flag(sk, SOCK_RCVTSTAMP); |
| 368 | sock_enable_timestamp(sk); |
| 369 | } else |
| 370 | sock_reset_flag(sk, SOCK_RCVTSTAMP); |
| 371 | break; |
| 372 | |
| 373 | case SO_RCVLOWAT: |
| 374 | if (val < 0) |
| 375 | val = INT_MAX; |
| 376 | sk->sk_rcvlowat = val ? : 1; |
| 377 | break; |
| 378 | |
| 379 | case SO_RCVTIMEO: |
| 380 | ret = sock_set_timeout(&sk->sk_rcvtimeo, optval, optlen); |
| 381 | break; |
| 382 | |
| 383 | case SO_SNDTIMEO: |
| 384 | ret = sock_set_timeout(&sk->sk_sndtimeo, optval, optlen); |
| 385 | break; |
| 386 | |
| 387 | #ifdef CONFIG_NETDEVICES |
| 388 | case SO_BINDTODEVICE: |
| 389 | { |
| 390 | char devname[IFNAMSIZ]; |
| 391 | |
| 392 | /* Sorry... */ |
| 393 | if (!capable(CAP_NET_RAW)) { |
| 394 | ret = -EPERM; |
| 395 | break; |
| 396 | } |
| 397 | |
| 398 | /* Bind this socket to a particular device like "eth0", |
| 399 | * as specified in the passed interface name. If the |
| 400 | * name is "" or the option length is zero the socket |
| 401 | * is not bound. |
| 402 | */ |
| 403 | |
| 404 | if (!valbool) { |
| 405 | sk->sk_bound_dev_if = 0; |
| 406 | } else { |
| 407 | if (optlen > IFNAMSIZ) |
| 408 | optlen = IFNAMSIZ; |
| 409 | if (copy_from_user(devname, optval, optlen)) { |
| 410 | ret = -EFAULT; |
| 411 | break; |
| 412 | } |
| 413 | |
| 414 | /* Remove any cached route for this socket. */ |
| 415 | sk_dst_reset(sk); |
| 416 | |
| 417 | if (devname[0] == '\0') { |
| 418 | sk->sk_bound_dev_if = 0; |
| 419 | } else { |
| 420 | struct net_device *dev = dev_get_by_name(devname); |
| 421 | if (!dev) { |
| 422 | ret = -ENODEV; |
| 423 | break; |
| 424 | } |
| 425 | sk->sk_bound_dev_if = dev->ifindex; |
| 426 | dev_put(dev); |
| 427 | } |
| 428 | } |
| 429 | break; |
| 430 | } |
| 431 | #endif |
| 432 | |
| 433 | |
| 434 | case SO_ATTACH_FILTER: |
| 435 | ret = -EINVAL; |
| 436 | if (optlen == sizeof(struct sock_fprog)) { |
| 437 | struct sock_fprog fprog; |
| 438 | |
| 439 | ret = -EFAULT; |
| 440 | if (copy_from_user(&fprog, optval, sizeof(fprog))) |
| 441 | break; |
| 442 | |
| 443 | ret = sk_attach_filter(&fprog, sk); |
| 444 | } |
| 445 | break; |
| 446 | |
| 447 | case SO_DETACH_FILTER: |
| 448 | spin_lock_bh(&sk->sk_lock.slock); |
| 449 | filter = sk->sk_filter; |
| 450 | if (filter) { |
| 451 | sk->sk_filter = NULL; |
| 452 | spin_unlock_bh(&sk->sk_lock.slock); |
| 453 | sk_filter_release(sk, filter); |
| 454 | break; |
| 455 | } |
| 456 | spin_unlock_bh(&sk->sk_lock.slock); |
| 457 | ret = -ENONET; |
| 458 | break; |
| 459 | |
| 460 | /* We implement the SO_SNDLOWAT etc to |
| 461 | not be settable (1003.1g 5.3) */ |
| 462 | default: |
| 463 | ret = -ENOPROTOOPT; |
| 464 | break; |
| 465 | } |
| 466 | release_sock(sk); |
| 467 | return ret; |
| 468 | } |
| 469 | |
| 470 | |
| 471 | int sock_getsockopt(struct socket *sock, int level, int optname, |
| 472 | char __user *optval, int __user *optlen) |
| 473 | { |
| 474 | struct sock *sk = sock->sk; |
| 475 | |
| 476 | union |
| 477 | { |
| 478 | int val; |
| 479 | struct linger ling; |
| 480 | struct timeval tm; |
| 481 | } v; |
| 482 | |
| 483 | unsigned int lv = sizeof(int); |
| 484 | int len; |
| 485 | |
| 486 | if(get_user(len,optlen)) |
| 487 | return -EFAULT; |
| 488 | if(len < 0) |
| 489 | return -EINVAL; |
| 490 | |
| 491 | switch(optname) |
| 492 | { |
| 493 | case SO_DEBUG: |
| 494 | v.val = sock_flag(sk, SOCK_DBG); |
| 495 | break; |
| 496 | |
| 497 | case SO_DONTROUTE: |
| 498 | v.val = sock_flag(sk, SOCK_LOCALROUTE); |
| 499 | break; |
| 500 | |
| 501 | case SO_BROADCAST: |
| 502 | v.val = !!sock_flag(sk, SOCK_BROADCAST); |
| 503 | break; |
| 504 | |
| 505 | case SO_SNDBUF: |
| 506 | v.val = sk->sk_sndbuf; |
| 507 | break; |
| 508 | |
| 509 | case SO_RCVBUF: |
| 510 | v.val = sk->sk_rcvbuf; |
| 511 | break; |
| 512 | |
| 513 | case SO_REUSEADDR: |
| 514 | v.val = sk->sk_reuse; |
| 515 | break; |
| 516 | |
| 517 | case SO_KEEPALIVE: |
| 518 | v.val = !!sock_flag(sk, SOCK_KEEPOPEN); |
| 519 | break; |
| 520 | |
| 521 | case SO_TYPE: |
| 522 | v.val = sk->sk_type; |
| 523 | break; |
| 524 | |
| 525 | case SO_ERROR: |
| 526 | v.val = -sock_error(sk); |
| 527 | if(v.val==0) |
| 528 | v.val = xchg(&sk->sk_err_soft, 0); |
| 529 | break; |
| 530 | |
| 531 | case SO_OOBINLINE: |
| 532 | v.val = !!sock_flag(sk, SOCK_URGINLINE); |
| 533 | break; |
| 534 | |
| 535 | case SO_NO_CHECK: |
| 536 | v.val = sk->sk_no_check; |
| 537 | break; |
| 538 | |
| 539 | case SO_PRIORITY: |
| 540 | v.val = sk->sk_priority; |
| 541 | break; |
| 542 | |
| 543 | case SO_LINGER: |
| 544 | lv = sizeof(v.ling); |
| 545 | v.ling.l_onoff = !!sock_flag(sk, SOCK_LINGER); |
| 546 | v.ling.l_linger = sk->sk_lingertime / HZ; |
| 547 | break; |
| 548 | |
| 549 | case SO_BSDCOMPAT: |
| 550 | sock_warn_obsolete_bsdism("getsockopt"); |
| 551 | break; |
| 552 | |
| 553 | case SO_TIMESTAMP: |
| 554 | v.val = sock_flag(sk, SOCK_RCVTSTAMP); |
| 555 | break; |
| 556 | |
| 557 | case SO_RCVTIMEO: |
| 558 | lv=sizeof(struct timeval); |
| 559 | if (sk->sk_rcvtimeo == MAX_SCHEDULE_TIMEOUT) { |
| 560 | v.tm.tv_sec = 0; |
| 561 | v.tm.tv_usec = 0; |
| 562 | } else { |
| 563 | v.tm.tv_sec = sk->sk_rcvtimeo / HZ; |
| 564 | v.tm.tv_usec = ((sk->sk_rcvtimeo % HZ) * 1000000) / HZ; |
| 565 | } |
| 566 | break; |
| 567 | |
| 568 | case SO_SNDTIMEO: |
| 569 | lv=sizeof(struct timeval); |
| 570 | if (sk->sk_sndtimeo == MAX_SCHEDULE_TIMEOUT) { |
| 571 | v.tm.tv_sec = 0; |
| 572 | v.tm.tv_usec = 0; |
| 573 | } else { |
| 574 | v.tm.tv_sec = sk->sk_sndtimeo / HZ; |
| 575 | v.tm.tv_usec = ((sk->sk_sndtimeo % HZ) * 1000000) / HZ; |
| 576 | } |
| 577 | break; |
| 578 | |
| 579 | case SO_RCVLOWAT: |
| 580 | v.val = sk->sk_rcvlowat; |
| 581 | break; |
| 582 | |
| 583 | case SO_SNDLOWAT: |
| 584 | v.val=1; |
| 585 | break; |
| 586 | |
| 587 | case SO_PASSCRED: |
| 588 | v.val = test_bit(SOCK_PASSCRED, &sock->flags) ? 1 : 0; |
| 589 | break; |
| 590 | |
| 591 | case SO_PEERCRED: |
| 592 | if (len > sizeof(sk->sk_peercred)) |
| 593 | len = sizeof(sk->sk_peercred); |
| 594 | if (copy_to_user(optval, &sk->sk_peercred, len)) |
| 595 | return -EFAULT; |
| 596 | goto lenout; |
| 597 | |
| 598 | case SO_PEERNAME: |
| 599 | { |
| 600 | char address[128]; |
| 601 | |
| 602 | if (sock->ops->getname(sock, (struct sockaddr *)address, &lv, 2)) |
| 603 | return -ENOTCONN; |
| 604 | if (lv < len) |
| 605 | return -EINVAL; |
| 606 | if (copy_to_user(optval, address, len)) |
| 607 | return -EFAULT; |
| 608 | goto lenout; |
| 609 | } |
| 610 | |
| 611 | /* Dubious BSD thing... Probably nobody even uses it, but |
| 612 | * the UNIX standard wants it for whatever reason... -DaveM |
| 613 | */ |
| 614 | case SO_ACCEPTCONN: |
| 615 | v.val = sk->sk_state == TCP_LISTEN; |
| 616 | break; |
| 617 | |
| 618 | case SO_PEERSEC: |
| 619 | return security_socket_getpeersec(sock, optval, optlen, len); |
| 620 | |
| 621 | default: |
| 622 | return(-ENOPROTOOPT); |
| 623 | } |
| 624 | if (len > lv) |
| 625 | len = lv; |
| 626 | if (copy_to_user(optval, &v, len)) |
| 627 | return -EFAULT; |
| 628 | lenout: |
| 629 | if (put_user(len, optlen)) |
| 630 | return -EFAULT; |
| 631 | return 0; |
| 632 | } |
| 633 | |
| 634 | /** |
| 635 | * sk_alloc - All socket objects are allocated here |
Pavel Pisa | 4dc3b16 | 2005-05-01 08:59:25 -0700 | [diff] [blame] | 636 | * @family: protocol family |
| 637 | * @priority: for allocation (%GFP_KERNEL, %GFP_ATOMIC, etc) |
| 638 | * @prot: struct proto associated with this new sock instance |
| 639 | * @zero_it: if we should zero the newly allocated sock |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 640 | */ |
Al Viro | dd0fc66 | 2005-10-07 07:46:04 +0100 | [diff] [blame] | 641 | struct sock *sk_alloc(int family, gfp_t priority, |
Victor Fusco | 86a76ca | 2005-07-08 14:57:47 -0700 | [diff] [blame] | 642 | struct proto *prot, int zero_it) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 643 | { |
| 644 | struct sock *sk = NULL; |
| 645 | kmem_cache_t *slab = prot->slab; |
| 646 | |
| 647 | if (slab != NULL) |
| 648 | sk = kmem_cache_alloc(slab, priority); |
| 649 | else |
| 650 | sk = kmalloc(prot->obj_size, priority); |
| 651 | |
| 652 | if (sk) { |
| 653 | if (zero_it) { |
| 654 | memset(sk, 0, prot->obj_size); |
| 655 | sk->sk_family = family; |
Arnaldo Carvalho de Melo | 476e19c | 2005-05-05 13:35:15 -0700 | [diff] [blame] | 656 | /* |
| 657 | * See comment in struct sock definition to understand |
| 658 | * why we need sk_prot_creator -acme |
| 659 | */ |
| 660 | sk->sk_prot = sk->sk_prot_creator = prot; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 661 | sock_lock_init(sk); |
| 662 | } |
| 663 | |
Frank Filz | a79af59 | 2005-09-27 15:23:38 -0700 | [diff] [blame] | 664 | if (security_sk_alloc(sk, family, priority)) |
| 665 | goto out_free; |
| 666 | |
| 667 | if (!try_module_get(prot->owner)) |
| 668 | goto out_free; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 669 | } |
| 670 | return sk; |
Frank Filz | a79af59 | 2005-09-27 15:23:38 -0700 | [diff] [blame] | 671 | |
| 672 | out_free: |
| 673 | if (slab != NULL) |
| 674 | kmem_cache_free(slab, sk); |
| 675 | else |
| 676 | kfree(sk); |
| 677 | return NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 678 | } |
| 679 | |
| 680 | void sk_free(struct sock *sk) |
| 681 | { |
| 682 | struct sk_filter *filter; |
Arnaldo Carvalho de Melo | 476e19c | 2005-05-05 13:35:15 -0700 | [diff] [blame] | 683 | struct module *owner = sk->sk_prot_creator->owner; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 684 | |
| 685 | if (sk->sk_destruct) |
| 686 | sk->sk_destruct(sk); |
| 687 | |
| 688 | filter = sk->sk_filter; |
| 689 | if (filter) { |
| 690 | sk_filter_release(sk, filter); |
| 691 | sk->sk_filter = NULL; |
| 692 | } |
| 693 | |
| 694 | sock_disable_timestamp(sk); |
| 695 | |
| 696 | if (atomic_read(&sk->sk_omem_alloc)) |
| 697 | printk(KERN_DEBUG "%s: optmem leakage (%d bytes) detected.\n", |
| 698 | __FUNCTION__, atomic_read(&sk->sk_omem_alloc)); |
| 699 | |
| 700 | security_sk_free(sk); |
Arnaldo Carvalho de Melo | 476e19c | 2005-05-05 13:35:15 -0700 | [diff] [blame] | 701 | if (sk->sk_prot_creator->slab != NULL) |
| 702 | kmem_cache_free(sk->sk_prot_creator->slab, sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 703 | else |
| 704 | kfree(sk); |
| 705 | module_put(owner); |
| 706 | } |
| 707 | |
Al Viro | dd0fc66 | 2005-10-07 07:46:04 +0100 | [diff] [blame] | 708 | struct sock *sk_clone(const struct sock *sk, const gfp_t priority) |
Arnaldo Carvalho de Melo | 87d11ce | 2005-08-09 20:10:12 -0700 | [diff] [blame] | 709 | { |
| 710 | struct sock *newsk = sk_alloc(sk->sk_family, priority, sk->sk_prot, 0); |
| 711 | |
| 712 | if (newsk != NULL) { |
| 713 | struct sk_filter *filter; |
| 714 | |
| 715 | memcpy(newsk, sk, sk->sk_prot->obj_size); |
| 716 | |
| 717 | /* SANITY */ |
| 718 | sk_node_init(&newsk->sk_node); |
| 719 | sock_lock_init(newsk); |
| 720 | bh_lock_sock(newsk); |
| 721 | |
| 722 | atomic_set(&newsk->sk_rmem_alloc, 0); |
| 723 | atomic_set(&newsk->sk_wmem_alloc, 0); |
| 724 | atomic_set(&newsk->sk_omem_alloc, 0); |
| 725 | skb_queue_head_init(&newsk->sk_receive_queue); |
| 726 | skb_queue_head_init(&newsk->sk_write_queue); |
| 727 | |
| 728 | rwlock_init(&newsk->sk_dst_lock); |
| 729 | rwlock_init(&newsk->sk_callback_lock); |
| 730 | |
| 731 | newsk->sk_dst_cache = NULL; |
| 732 | newsk->sk_wmem_queued = 0; |
| 733 | newsk->sk_forward_alloc = 0; |
| 734 | newsk->sk_send_head = NULL; |
| 735 | newsk->sk_backlog.head = newsk->sk_backlog.tail = NULL; |
| 736 | newsk->sk_userlocks = sk->sk_userlocks & ~SOCK_BINDPORT_LOCK; |
| 737 | |
| 738 | sock_reset_flag(newsk, SOCK_DONE); |
| 739 | skb_queue_head_init(&newsk->sk_error_queue); |
| 740 | |
| 741 | filter = newsk->sk_filter; |
| 742 | if (filter != NULL) |
| 743 | sk_filter_charge(newsk, filter); |
| 744 | |
| 745 | if (unlikely(xfrm_sk_clone_policy(newsk))) { |
| 746 | /* It is still raw copy of parent, so invalidate |
| 747 | * destructor and make plain sk_free() */ |
| 748 | newsk->sk_destruct = NULL; |
| 749 | sk_free(newsk); |
| 750 | newsk = NULL; |
| 751 | goto out; |
| 752 | } |
| 753 | |
| 754 | newsk->sk_err = 0; |
| 755 | newsk->sk_priority = 0; |
| 756 | atomic_set(&newsk->sk_refcnt, 2); |
| 757 | |
| 758 | /* |
| 759 | * Increment the counter in the same struct proto as the master |
| 760 | * sock (sk_refcnt_debug_inc uses newsk->sk_prot->socks, that |
| 761 | * is the same as sk->sk_prot->socks, as this field was copied |
| 762 | * with memcpy). |
| 763 | * |
| 764 | * This _changes_ the previous behaviour, where |
| 765 | * tcp_create_openreq_child always was incrementing the |
| 766 | * equivalent to tcp_prot->socks (inet_sock_nr), so this have |
| 767 | * to be taken into account in all callers. -acme |
| 768 | */ |
| 769 | sk_refcnt_debug_inc(newsk); |
| 770 | newsk->sk_socket = NULL; |
| 771 | newsk->sk_sleep = NULL; |
| 772 | |
| 773 | if (newsk->sk_prot->sockets_allocated) |
| 774 | atomic_inc(newsk->sk_prot->sockets_allocated); |
| 775 | } |
| 776 | out: |
| 777 | return newsk; |
| 778 | } |
| 779 | |
| 780 | EXPORT_SYMBOL_GPL(sk_clone); |
| 781 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 782 | void __init sk_init(void) |
| 783 | { |
| 784 | if (num_physpages <= 4096) { |
| 785 | sysctl_wmem_max = 32767; |
| 786 | sysctl_rmem_max = 32767; |
| 787 | sysctl_wmem_default = 32767; |
| 788 | sysctl_rmem_default = 32767; |
| 789 | } else if (num_physpages >= 131072) { |
| 790 | sysctl_wmem_max = 131071; |
| 791 | sysctl_rmem_max = 131071; |
| 792 | } |
| 793 | } |
| 794 | |
| 795 | /* |
| 796 | * Simple resource managers for sockets. |
| 797 | */ |
| 798 | |
| 799 | |
| 800 | /* |
| 801 | * Write buffer destructor automatically called from kfree_skb. |
| 802 | */ |
| 803 | void sock_wfree(struct sk_buff *skb) |
| 804 | { |
| 805 | struct sock *sk = skb->sk; |
| 806 | |
| 807 | /* In case it might be waiting for more memory. */ |
| 808 | atomic_sub(skb->truesize, &sk->sk_wmem_alloc); |
| 809 | if (!sock_flag(sk, SOCK_USE_WRITE_QUEUE)) |
| 810 | sk->sk_write_space(sk); |
| 811 | sock_put(sk); |
| 812 | } |
| 813 | |
| 814 | /* |
| 815 | * Read buffer destructor automatically called from kfree_skb. |
| 816 | */ |
| 817 | void sock_rfree(struct sk_buff *skb) |
| 818 | { |
| 819 | struct sock *sk = skb->sk; |
| 820 | |
| 821 | atomic_sub(skb->truesize, &sk->sk_rmem_alloc); |
| 822 | } |
| 823 | |
| 824 | |
| 825 | int sock_i_uid(struct sock *sk) |
| 826 | { |
| 827 | int uid; |
| 828 | |
| 829 | read_lock(&sk->sk_callback_lock); |
| 830 | uid = sk->sk_socket ? SOCK_INODE(sk->sk_socket)->i_uid : 0; |
| 831 | read_unlock(&sk->sk_callback_lock); |
| 832 | return uid; |
| 833 | } |
| 834 | |
| 835 | unsigned long sock_i_ino(struct sock *sk) |
| 836 | { |
| 837 | unsigned long ino; |
| 838 | |
| 839 | read_lock(&sk->sk_callback_lock); |
| 840 | ino = sk->sk_socket ? SOCK_INODE(sk->sk_socket)->i_ino : 0; |
| 841 | read_unlock(&sk->sk_callback_lock); |
| 842 | return ino; |
| 843 | } |
| 844 | |
| 845 | /* |
| 846 | * Allocate a skb from the socket's send buffer. |
| 847 | */ |
Victor Fusco | 86a76ca | 2005-07-08 14:57:47 -0700 | [diff] [blame] | 848 | struct sk_buff *sock_wmalloc(struct sock *sk, unsigned long size, int force, |
Al Viro | dd0fc66 | 2005-10-07 07:46:04 +0100 | [diff] [blame] | 849 | gfp_t priority) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 850 | { |
| 851 | if (force || atomic_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf) { |
| 852 | struct sk_buff * skb = alloc_skb(size, priority); |
| 853 | if (skb) { |
| 854 | skb_set_owner_w(skb, sk); |
| 855 | return skb; |
| 856 | } |
| 857 | } |
| 858 | return NULL; |
| 859 | } |
| 860 | |
| 861 | /* |
| 862 | * Allocate a skb from the socket's receive buffer. |
| 863 | */ |
Victor Fusco | 86a76ca | 2005-07-08 14:57:47 -0700 | [diff] [blame] | 864 | struct sk_buff *sock_rmalloc(struct sock *sk, unsigned long size, int force, |
Al Viro | dd0fc66 | 2005-10-07 07:46:04 +0100 | [diff] [blame] | 865 | gfp_t priority) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 866 | { |
| 867 | if (force || atomic_read(&sk->sk_rmem_alloc) < sk->sk_rcvbuf) { |
| 868 | struct sk_buff *skb = alloc_skb(size, priority); |
| 869 | if (skb) { |
| 870 | skb_set_owner_r(skb, sk); |
| 871 | return skb; |
| 872 | } |
| 873 | } |
| 874 | return NULL; |
| 875 | } |
| 876 | |
| 877 | /* |
| 878 | * Allocate a memory block from the socket's option memory buffer. |
| 879 | */ |
Al Viro | dd0fc66 | 2005-10-07 07:46:04 +0100 | [diff] [blame] | 880 | void *sock_kmalloc(struct sock *sk, int size, gfp_t priority) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 881 | { |
| 882 | if ((unsigned)size <= sysctl_optmem_max && |
| 883 | atomic_read(&sk->sk_omem_alloc) + size < sysctl_optmem_max) { |
| 884 | void *mem; |
| 885 | /* First do the add, to avoid the race if kmalloc |
| 886 | * might sleep. |
| 887 | */ |
| 888 | atomic_add(size, &sk->sk_omem_alloc); |
| 889 | mem = kmalloc(size, priority); |
| 890 | if (mem) |
| 891 | return mem; |
| 892 | atomic_sub(size, &sk->sk_omem_alloc); |
| 893 | } |
| 894 | return NULL; |
| 895 | } |
| 896 | |
| 897 | /* |
| 898 | * Free an option memory block. |
| 899 | */ |
| 900 | void sock_kfree_s(struct sock *sk, void *mem, int size) |
| 901 | { |
| 902 | kfree(mem); |
| 903 | atomic_sub(size, &sk->sk_omem_alloc); |
| 904 | } |
| 905 | |
| 906 | /* It is almost wait_for_tcp_memory minus release_sock/lock_sock. |
| 907 | I think, these locks should be removed for datagram sockets. |
| 908 | */ |
| 909 | static long sock_wait_for_wmem(struct sock * sk, long timeo) |
| 910 | { |
| 911 | DEFINE_WAIT(wait); |
| 912 | |
| 913 | clear_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags); |
| 914 | for (;;) { |
| 915 | if (!timeo) |
| 916 | break; |
| 917 | if (signal_pending(current)) |
| 918 | break; |
| 919 | set_bit(SOCK_NOSPACE, &sk->sk_socket->flags); |
| 920 | prepare_to_wait(sk->sk_sleep, &wait, TASK_INTERRUPTIBLE); |
| 921 | if (atomic_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf) |
| 922 | break; |
| 923 | if (sk->sk_shutdown & SEND_SHUTDOWN) |
| 924 | break; |
| 925 | if (sk->sk_err) |
| 926 | break; |
| 927 | timeo = schedule_timeout(timeo); |
| 928 | } |
| 929 | finish_wait(sk->sk_sleep, &wait); |
| 930 | return timeo; |
| 931 | } |
| 932 | |
| 933 | |
| 934 | /* |
| 935 | * Generic send/receive buffer handlers |
| 936 | */ |
| 937 | |
| 938 | static struct sk_buff *sock_alloc_send_pskb(struct sock *sk, |
| 939 | unsigned long header_len, |
| 940 | unsigned long data_len, |
| 941 | int noblock, int *errcode) |
| 942 | { |
| 943 | struct sk_buff *skb; |
Al Viro | 7d877f3 | 2005-10-21 03:20:43 -0400 | [diff] [blame] | 944 | gfp_t gfp_mask; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 945 | long timeo; |
| 946 | int err; |
| 947 | |
| 948 | gfp_mask = sk->sk_allocation; |
| 949 | if (gfp_mask & __GFP_WAIT) |
| 950 | gfp_mask |= __GFP_REPEAT; |
| 951 | |
| 952 | timeo = sock_sndtimeo(sk, noblock); |
| 953 | while (1) { |
| 954 | err = sock_error(sk); |
| 955 | if (err != 0) |
| 956 | goto failure; |
| 957 | |
| 958 | err = -EPIPE; |
| 959 | if (sk->sk_shutdown & SEND_SHUTDOWN) |
| 960 | goto failure; |
| 961 | |
| 962 | if (atomic_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf) { |
| 963 | skb = alloc_skb(header_len, sk->sk_allocation); |
| 964 | if (skb) { |
| 965 | int npages; |
| 966 | int i; |
| 967 | |
| 968 | /* No pages, we're done... */ |
| 969 | if (!data_len) |
| 970 | break; |
| 971 | |
| 972 | npages = (data_len + (PAGE_SIZE - 1)) >> PAGE_SHIFT; |
| 973 | skb->truesize += data_len; |
| 974 | skb_shinfo(skb)->nr_frags = npages; |
| 975 | for (i = 0; i < npages; i++) { |
| 976 | struct page *page; |
| 977 | skb_frag_t *frag; |
| 978 | |
| 979 | page = alloc_pages(sk->sk_allocation, 0); |
| 980 | if (!page) { |
| 981 | err = -ENOBUFS; |
| 982 | skb_shinfo(skb)->nr_frags = i; |
| 983 | kfree_skb(skb); |
| 984 | goto failure; |
| 985 | } |
| 986 | |
| 987 | frag = &skb_shinfo(skb)->frags[i]; |
| 988 | frag->page = page; |
| 989 | frag->page_offset = 0; |
| 990 | frag->size = (data_len >= PAGE_SIZE ? |
| 991 | PAGE_SIZE : |
| 992 | data_len); |
| 993 | data_len -= PAGE_SIZE; |
| 994 | } |
| 995 | |
| 996 | /* Full success... */ |
| 997 | break; |
| 998 | } |
| 999 | err = -ENOBUFS; |
| 1000 | goto failure; |
| 1001 | } |
| 1002 | set_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags); |
| 1003 | set_bit(SOCK_NOSPACE, &sk->sk_socket->flags); |
| 1004 | err = -EAGAIN; |
| 1005 | if (!timeo) |
| 1006 | goto failure; |
| 1007 | if (signal_pending(current)) |
| 1008 | goto interrupted; |
| 1009 | timeo = sock_wait_for_wmem(sk, timeo); |
| 1010 | } |
| 1011 | |
| 1012 | skb_set_owner_w(skb, sk); |
| 1013 | return skb; |
| 1014 | |
| 1015 | interrupted: |
| 1016 | err = sock_intr_errno(timeo); |
| 1017 | failure: |
| 1018 | *errcode = err; |
| 1019 | return NULL; |
| 1020 | } |
| 1021 | |
| 1022 | struct sk_buff *sock_alloc_send_skb(struct sock *sk, unsigned long size, |
| 1023 | int noblock, int *errcode) |
| 1024 | { |
| 1025 | return sock_alloc_send_pskb(sk, size, 0, noblock, errcode); |
| 1026 | } |
| 1027 | |
| 1028 | static void __lock_sock(struct sock *sk) |
| 1029 | { |
| 1030 | DEFINE_WAIT(wait); |
| 1031 | |
| 1032 | for(;;) { |
| 1033 | prepare_to_wait_exclusive(&sk->sk_lock.wq, &wait, |
| 1034 | TASK_UNINTERRUPTIBLE); |
| 1035 | spin_unlock_bh(&sk->sk_lock.slock); |
| 1036 | schedule(); |
| 1037 | spin_lock_bh(&sk->sk_lock.slock); |
| 1038 | if(!sock_owned_by_user(sk)) |
| 1039 | break; |
| 1040 | } |
| 1041 | finish_wait(&sk->sk_lock.wq, &wait); |
| 1042 | } |
| 1043 | |
| 1044 | static void __release_sock(struct sock *sk) |
| 1045 | { |
| 1046 | struct sk_buff *skb = sk->sk_backlog.head; |
| 1047 | |
| 1048 | do { |
| 1049 | sk->sk_backlog.head = sk->sk_backlog.tail = NULL; |
| 1050 | bh_unlock_sock(sk); |
| 1051 | |
| 1052 | do { |
| 1053 | struct sk_buff *next = skb->next; |
| 1054 | |
| 1055 | skb->next = NULL; |
| 1056 | sk->sk_backlog_rcv(sk, skb); |
| 1057 | |
| 1058 | /* |
| 1059 | * We are in process context here with softirqs |
| 1060 | * disabled, use cond_resched_softirq() to preempt. |
| 1061 | * This is safe to do because we've taken the backlog |
| 1062 | * queue private: |
| 1063 | */ |
| 1064 | cond_resched_softirq(); |
| 1065 | |
| 1066 | skb = next; |
| 1067 | } while (skb != NULL); |
| 1068 | |
| 1069 | bh_lock_sock(sk); |
| 1070 | } while((skb = sk->sk_backlog.head) != NULL); |
| 1071 | } |
| 1072 | |
| 1073 | /** |
| 1074 | * sk_wait_data - wait for data to arrive at sk_receive_queue |
Pavel Pisa | 4dc3b16 | 2005-05-01 08:59:25 -0700 | [diff] [blame] | 1075 | * @sk: sock to wait on |
| 1076 | * @timeo: for how long |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1077 | * |
| 1078 | * Now socket state including sk->sk_err is changed only under lock, |
| 1079 | * hence we may omit checks after joining wait queue. |
| 1080 | * We check receive queue before schedule() only as optimization; |
| 1081 | * it is very likely that release_sock() added new data. |
| 1082 | */ |
| 1083 | int sk_wait_data(struct sock *sk, long *timeo) |
| 1084 | { |
| 1085 | int rc; |
| 1086 | DEFINE_WAIT(wait); |
| 1087 | |
| 1088 | prepare_to_wait(sk->sk_sleep, &wait, TASK_INTERRUPTIBLE); |
| 1089 | set_bit(SOCK_ASYNC_WAITDATA, &sk->sk_socket->flags); |
| 1090 | rc = sk_wait_event(sk, timeo, !skb_queue_empty(&sk->sk_receive_queue)); |
| 1091 | clear_bit(SOCK_ASYNC_WAITDATA, &sk->sk_socket->flags); |
| 1092 | finish_wait(sk->sk_sleep, &wait); |
| 1093 | return rc; |
| 1094 | } |
| 1095 | |
| 1096 | EXPORT_SYMBOL(sk_wait_data); |
| 1097 | |
| 1098 | /* |
| 1099 | * Set of default routines for initialising struct proto_ops when |
| 1100 | * the protocol does not support a particular function. In certain |
| 1101 | * cases where it makes no sense for a protocol to have a "do nothing" |
| 1102 | * function, some default processing is provided. |
| 1103 | */ |
| 1104 | |
| 1105 | int sock_no_bind(struct socket *sock, struct sockaddr *saddr, int len) |
| 1106 | { |
| 1107 | return -EOPNOTSUPP; |
| 1108 | } |
| 1109 | |
| 1110 | int sock_no_connect(struct socket *sock, struct sockaddr *saddr, |
| 1111 | int len, int flags) |
| 1112 | { |
| 1113 | return -EOPNOTSUPP; |
| 1114 | } |
| 1115 | |
| 1116 | int sock_no_socketpair(struct socket *sock1, struct socket *sock2) |
| 1117 | { |
| 1118 | return -EOPNOTSUPP; |
| 1119 | } |
| 1120 | |
| 1121 | int sock_no_accept(struct socket *sock, struct socket *newsock, int flags) |
| 1122 | { |
| 1123 | return -EOPNOTSUPP; |
| 1124 | } |
| 1125 | |
| 1126 | int sock_no_getname(struct socket *sock, struct sockaddr *saddr, |
| 1127 | int *len, int peer) |
| 1128 | { |
| 1129 | return -EOPNOTSUPP; |
| 1130 | } |
| 1131 | |
| 1132 | unsigned int sock_no_poll(struct file * file, struct socket *sock, poll_table *pt) |
| 1133 | { |
| 1134 | return 0; |
| 1135 | } |
| 1136 | |
| 1137 | int sock_no_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg) |
| 1138 | { |
| 1139 | return -EOPNOTSUPP; |
| 1140 | } |
| 1141 | |
| 1142 | int sock_no_listen(struct socket *sock, int backlog) |
| 1143 | { |
| 1144 | return -EOPNOTSUPP; |
| 1145 | } |
| 1146 | |
| 1147 | int sock_no_shutdown(struct socket *sock, int how) |
| 1148 | { |
| 1149 | return -EOPNOTSUPP; |
| 1150 | } |
| 1151 | |
| 1152 | int sock_no_setsockopt(struct socket *sock, int level, int optname, |
| 1153 | char __user *optval, int optlen) |
| 1154 | { |
| 1155 | return -EOPNOTSUPP; |
| 1156 | } |
| 1157 | |
| 1158 | int sock_no_getsockopt(struct socket *sock, int level, int optname, |
| 1159 | char __user *optval, int __user *optlen) |
| 1160 | { |
| 1161 | return -EOPNOTSUPP; |
| 1162 | } |
| 1163 | |
| 1164 | int sock_no_sendmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *m, |
| 1165 | size_t len) |
| 1166 | { |
| 1167 | return -EOPNOTSUPP; |
| 1168 | } |
| 1169 | |
| 1170 | int sock_no_recvmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *m, |
| 1171 | size_t len, int flags) |
| 1172 | { |
| 1173 | return -EOPNOTSUPP; |
| 1174 | } |
| 1175 | |
| 1176 | int sock_no_mmap(struct file *file, struct socket *sock, struct vm_area_struct *vma) |
| 1177 | { |
| 1178 | /* Mirror missing mmap method error code */ |
| 1179 | return -ENODEV; |
| 1180 | } |
| 1181 | |
| 1182 | ssize_t sock_no_sendpage(struct socket *sock, struct page *page, int offset, size_t size, int flags) |
| 1183 | { |
| 1184 | ssize_t res; |
| 1185 | struct msghdr msg = {.msg_flags = flags}; |
| 1186 | struct kvec iov; |
| 1187 | char *kaddr = kmap(page); |
| 1188 | iov.iov_base = kaddr + offset; |
| 1189 | iov.iov_len = size; |
| 1190 | res = kernel_sendmsg(sock, &msg, &iov, 1, size); |
| 1191 | kunmap(page); |
| 1192 | return res; |
| 1193 | } |
| 1194 | |
| 1195 | /* |
| 1196 | * Default Socket Callbacks |
| 1197 | */ |
| 1198 | |
| 1199 | static void sock_def_wakeup(struct sock *sk) |
| 1200 | { |
| 1201 | read_lock(&sk->sk_callback_lock); |
| 1202 | if (sk->sk_sleep && waitqueue_active(sk->sk_sleep)) |
| 1203 | wake_up_interruptible_all(sk->sk_sleep); |
| 1204 | read_unlock(&sk->sk_callback_lock); |
| 1205 | } |
| 1206 | |
| 1207 | static void sock_def_error_report(struct sock *sk) |
| 1208 | { |
| 1209 | read_lock(&sk->sk_callback_lock); |
| 1210 | if (sk->sk_sleep && waitqueue_active(sk->sk_sleep)) |
| 1211 | wake_up_interruptible(sk->sk_sleep); |
| 1212 | sk_wake_async(sk,0,POLL_ERR); |
| 1213 | read_unlock(&sk->sk_callback_lock); |
| 1214 | } |
| 1215 | |
| 1216 | static void sock_def_readable(struct sock *sk, int len) |
| 1217 | { |
| 1218 | read_lock(&sk->sk_callback_lock); |
| 1219 | if (sk->sk_sleep && waitqueue_active(sk->sk_sleep)) |
| 1220 | wake_up_interruptible(sk->sk_sleep); |
| 1221 | sk_wake_async(sk,1,POLL_IN); |
| 1222 | read_unlock(&sk->sk_callback_lock); |
| 1223 | } |
| 1224 | |
| 1225 | static void sock_def_write_space(struct sock *sk) |
| 1226 | { |
| 1227 | read_lock(&sk->sk_callback_lock); |
| 1228 | |
| 1229 | /* Do not wake up a writer until he can make "significant" |
| 1230 | * progress. --DaveM |
| 1231 | */ |
| 1232 | if((atomic_read(&sk->sk_wmem_alloc) << 1) <= sk->sk_sndbuf) { |
| 1233 | if (sk->sk_sleep && waitqueue_active(sk->sk_sleep)) |
| 1234 | wake_up_interruptible(sk->sk_sleep); |
| 1235 | |
| 1236 | /* Should agree with poll, otherwise some programs break */ |
| 1237 | if (sock_writeable(sk)) |
| 1238 | sk_wake_async(sk, 2, POLL_OUT); |
| 1239 | } |
| 1240 | |
| 1241 | read_unlock(&sk->sk_callback_lock); |
| 1242 | } |
| 1243 | |
| 1244 | static void sock_def_destruct(struct sock *sk) |
| 1245 | { |
Jesper Juhl | a51482b | 2005-11-08 09:41:34 -0800 | [diff] [blame] | 1246 | kfree(sk->sk_protinfo); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1247 | } |
| 1248 | |
| 1249 | void sk_send_sigurg(struct sock *sk) |
| 1250 | { |
| 1251 | if (sk->sk_socket && sk->sk_socket->file) |
| 1252 | if (send_sigurg(&sk->sk_socket->file->f_owner)) |
| 1253 | sk_wake_async(sk, 3, POLL_PRI); |
| 1254 | } |
| 1255 | |
| 1256 | void sk_reset_timer(struct sock *sk, struct timer_list* timer, |
| 1257 | unsigned long expires) |
| 1258 | { |
| 1259 | if (!mod_timer(timer, expires)) |
| 1260 | sock_hold(sk); |
| 1261 | } |
| 1262 | |
| 1263 | EXPORT_SYMBOL(sk_reset_timer); |
| 1264 | |
| 1265 | void sk_stop_timer(struct sock *sk, struct timer_list* timer) |
| 1266 | { |
| 1267 | if (timer_pending(timer) && del_timer(timer)) |
| 1268 | __sock_put(sk); |
| 1269 | } |
| 1270 | |
| 1271 | EXPORT_SYMBOL(sk_stop_timer); |
| 1272 | |
| 1273 | void sock_init_data(struct socket *sock, struct sock *sk) |
| 1274 | { |
| 1275 | skb_queue_head_init(&sk->sk_receive_queue); |
| 1276 | skb_queue_head_init(&sk->sk_write_queue); |
| 1277 | skb_queue_head_init(&sk->sk_error_queue); |
| 1278 | |
| 1279 | sk->sk_send_head = NULL; |
| 1280 | |
| 1281 | init_timer(&sk->sk_timer); |
| 1282 | |
| 1283 | sk->sk_allocation = GFP_KERNEL; |
| 1284 | sk->sk_rcvbuf = sysctl_rmem_default; |
| 1285 | sk->sk_sndbuf = sysctl_wmem_default; |
| 1286 | sk->sk_state = TCP_CLOSE; |
| 1287 | sk->sk_socket = sock; |
| 1288 | |
| 1289 | sock_set_flag(sk, SOCK_ZAPPED); |
| 1290 | |
| 1291 | if(sock) |
| 1292 | { |
| 1293 | sk->sk_type = sock->type; |
| 1294 | sk->sk_sleep = &sock->wait; |
| 1295 | sock->sk = sk; |
| 1296 | } else |
| 1297 | sk->sk_sleep = NULL; |
| 1298 | |
| 1299 | rwlock_init(&sk->sk_dst_lock); |
| 1300 | rwlock_init(&sk->sk_callback_lock); |
| 1301 | |
| 1302 | sk->sk_state_change = sock_def_wakeup; |
| 1303 | sk->sk_data_ready = sock_def_readable; |
| 1304 | sk->sk_write_space = sock_def_write_space; |
| 1305 | sk->sk_error_report = sock_def_error_report; |
| 1306 | sk->sk_destruct = sock_def_destruct; |
| 1307 | |
| 1308 | sk->sk_sndmsg_page = NULL; |
| 1309 | sk->sk_sndmsg_off = 0; |
| 1310 | |
| 1311 | sk->sk_peercred.pid = 0; |
| 1312 | sk->sk_peercred.uid = -1; |
| 1313 | sk->sk_peercred.gid = -1; |
| 1314 | sk->sk_write_pending = 0; |
| 1315 | sk->sk_rcvlowat = 1; |
| 1316 | sk->sk_rcvtimeo = MAX_SCHEDULE_TIMEOUT; |
| 1317 | sk->sk_sndtimeo = MAX_SCHEDULE_TIMEOUT; |
| 1318 | |
| 1319 | sk->sk_stamp.tv_sec = -1L; |
| 1320 | sk->sk_stamp.tv_usec = -1L; |
| 1321 | |
| 1322 | atomic_set(&sk->sk_refcnt, 1); |
| 1323 | } |
| 1324 | |
| 1325 | void fastcall lock_sock(struct sock *sk) |
| 1326 | { |
| 1327 | might_sleep(); |
| 1328 | spin_lock_bh(&(sk->sk_lock.slock)); |
| 1329 | if (sk->sk_lock.owner) |
| 1330 | __lock_sock(sk); |
| 1331 | sk->sk_lock.owner = (void *)1; |
| 1332 | spin_unlock_bh(&(sk->sk_lock.slock)); |
| 1333 | } |
| 1334 | |
| 1335 | EXPORT_SYMBOL(lock_sock); |
| 1336 | |
| 1337 | void fastcall release_sock(struct sock *sk) |
| 1338 | { |
| 1339 | spin_lock_bh(&(sk->sk_lock.slock)); |
| 1340 | if (sk->sk_backlog.tail) |
| 1341 | __release_sock(sk); |
| 1342 | sk->sk_lock.owner = NULL; |
| 1343 | if (waitqueue_active(&(sk->sk_lock.wq))) |
| 1344 | wake_up(&(sk->sk_lock.wq)); |
| 1345 | spin_unlock_bh(&(sk->sk_lock.slock)); |
| 1346 | } |
| 1347 | EXPORT_SYMBOL(release_sock); |
| 1348 | |
| 1349 | int sock_get_timestamp(struct sock *sk, struct timeval __user *userstamp) |
| 1350 | { |
| 1351 | if (!sock_flag(sk, SOCK_TIMESTAMP)) |
| 1352 | sock_enable_timestamp(sk); |
| 1353 | if (sk->sk_stamp.tv_sec == -1) |
| 1354 | return -ENOENT; |
| 1355 | if (sk->sk_stamp.tv_sec == 0) |
| 1356 | do_gettimeofday(&sk->sk_stamp); |
| 1357 | return copy_to_user(userstamp, &sk->sk_stamp, sizeof(struct timeval)) ? |
| 1358 | -EFAULT : 0; |
| 1359 | } |
| 1360 | EXPORT_SYMBOL(sock_get_timestamp); |
| 1361 | |
| 1362 | void sock_enable_timestamp(struct sock *sk) |
| 1363 | { |
| 1364 | if (!sock_flag(sk, SOCK_TIMESTAMP)) { |
| 1365 | sock_set_flag(sk, SOCK_TIMESTAMP); |
| 1366 | net_enable_timestamp(); |
| 1367 | } |
| 1368 | } |
| 1369 | EXPORT_SYMBOL(sock_enable_timestamp); |
| 1370 | |
| 1371 | /* |
| 1372 | * Get a socket option on an socket. |
| 1373 | * |
| 1374 | * FIX: POSIX 1003.1g is very ambiguous here. It states that |
| 1375 | * asynchronous errors should be reported by getsockopt. We assume |
| 1376 | * this means if you specify SO_ERROR (otherwise whats the point of it). |
| 1377 | */ |
| 1378 | int sock_common_getsockopt(struct socket *sock, int level, int optname, |
| 1379 | char __user *optval, int __user *optlen) |
| 1380 | { |
| 1381 | struct sock *sk = sock->sk; |
| 1382 | |
| 1383 | return sk->sk_prot->getsockopt(sk, level, optname, optval, optlen); |
| 1384 | } |
| 1385 | |
| 1386 | EXPORT_SYMBOL(sock_common_getsockopt); |
| 1387 | |
| 1388 | int sock_common_recvmsg(struct kiocb *iocb, struct socket *sock, |
| 1389 | struct msghdr *msg, size_t size, int flags) |
| 1390 | { |
| 1391 | struct sock *sk = sock->sk; |
| 1392 | int addr_len = 0; |
| 1393 | int err; |
| 1394 | |
| 1395 | err = sk->sk_prot->recvmsg(iocb, sk, msg, size, flags & MSG_DONTWAIT, |
| 1396 | flags & ~MSG_DONTWAIT, &addr_len); |
| 1397 | if (err >= 0) |
| 1398 | msg->msg_namelen = addr_len; |
| 1399 | return err; |
| 1400 | } |
| 1401 | |
| 1402 | EXPORT_SYMBOL(sock_common_recvmsg); |
| 1403 | |
| 1404 | /* |
| 1405 | * Set socket options on an inet socket. |
| 1406 | */ |
| 1407 | int sock_common_setsockopt(struct socket *sock, int level, int optname, |
| 1408 | char __user *optval, int optlen) |
| 1409 | { |
| 1410 | struct sock *sk = sock->sk; |
| 1411 | |
| 1412 | return sk->sk_prot->setsockopt(sk, level, optname, optval, optlen); |
| 1413 | } |
| 1414 | |
| 1415 | EXPORT_SYMBOL(sock_common_setsockopt); |
| 1416 | |
| 1417 | void sk_common_release(struct sock *sk) |
| 1418 | { |
| 1419 | if (sk->sk_prot->destroy) |
| 1420 | sk->sk_prot->destroy(sk); |
| 1421 | |
| 1422 | /* |
| 1423 | * Observation: when sock_common_release is called, processes have |
| 1424 | * no access to socket. But net still has. |
| 1425 | * Step one, detach it from networking: |
| 1426 | * |
| 1427 | * A. Remove from hash tables. |
| 1428 | */ |
| 1429 | |
| 1430 | sk->sk_prot->unhash(sk); |
| 1431 | |
| 1432 | /* |
| 1433 | * In this point socket cannot receive new packets, but it is possible |
| 1434 | * that some packets are in flight because some CPU runs receiver and |
| 1435 | * did hash table lookup before we unhashed socket. They will achieve |
| 1436 | * receive queue and will be purged by socket destructor. |
| 1437 | * |
| 1438 | * Also we still have packets pending on receive queue and probably, |
| 1439 | * our own packets waiting in device queues. sock_destroy will drain |
| 1440 | * receive queue, but transmitted packets will delay socket destruction |
| 1441 | * until the last reference will be released. |
| 1442 | */ |
| 1443 | |
| 1444 | sock_orphan(sk); |
| 1445 | |
| 1446 | xfrm_sk_free_policy(sk); |
| 1447 | |
Arnaldo Carvalho de Melo | e684897 | 2005-08-09 19:45:38 -0700 | [diff] [blame] | 1448 | sk_refcnt_debug_release(sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1449 | sock_put(sk); |
| 1450 | } |
| 1451 | |
| 1452 | EXPORT_SYMBOL(sk_common_release); |
| 1453 | |
| 1454 | static DEFINE_RWLOCK(proto_list_lock); |
| 1455 | static LIST_HEAD(proto_list); |
| 1456 | |
| 1457 | int proto_register(struct proto *prot, int alloc_slab) |
| 1458 | { |
Arnaldo Carvalho de Melo | 8feaf0c | 2005-08-09 20:09:30 -0700 | [diff] [blame] | 1459 | char *request_sock_slab_name = NULL; |
| 1460 | char *timewait_sock_slab_name; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1461 | int rc = -ENOBUFS; |
| 1462 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1463 | if (alloc_slab) { |
| 1464 | prot->slab = kmem_cache_create(prot->name, prot->obj_size, 0, |
| 1465 | SLAB_HWCACHE_ALIGN, NULL, NULL); |
| 1466 | |
| 1467 | if (prot->slab == NULL) { |
| 1468 | printk(KERN_CRIT "%s: Can't create sock SLAB cache!\n", |
| 1469 | prot->name); |
Arnaldo Carvalho de Melo | 2a27805 | 2005-04-16 15:24:09 -0700 | [diff] [blame] | 1470 | goto out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1471 | } |
Arnaldo Carvalho de Melo | 2e6599c | 2005-06-18 22:46:52 -0700 | [diff] [blame] | 1472 | |
| 1473 | if (prot->rsk_prot != NULL) { |
| 1474 | static const char mask[] = "request_sock_%s"; |
| 1475 | |
| 1476 | request_sock_slab_name = kmalloc(strlen(prot->name) + sizeof(mask) - 1, GFP_KERNEL); |
| 1477 | if (request_sock_slab_name == NULL) |
| 1478 | goto out_free_sock_slab; |
| 1479 | |
| 1480 | sprintf(request_sock_slab_name, mask, prot->name); |
| 1481 | prot->rsk_prot->slab = kmem_cache_create(request_sock_slab_name, |
| 1482 | prot->rsk_prot->obj_size, 0, |
| 1483 | SLAB_HWCACHE_ALIGN, NULL, NULL); |
| 1484 | |
| 1485 | if (prot->rsk_prot->slab == NULL) { |
| 1486 | printk(KERN_CRIT "%s: Can't create request sock SLAB cache!\n", |
| 1487 | prot->name); |
| 1488 | goto out_free_request_sock_slab_name; |
| 1489 | } |
| 1490 | } |
Arnaldo Carvalho de Melo | 8feaf0c | 2005-08-09 20:09:30 -0700 | [diff] [blame] | 1491 | |
Arnaldo Carvalho de Melo | 6d6ee43 | 2005-12-13 23:25:19 -0800 | [diff] [blame] | 1492 | if (prot->twsk_prot != NULL) { |
Arnaldo Carvalho de Melo | 8feaf0c | 2005-08-09 20:09:30 -0700 | [diff] [blame] | 1493 | static const char mask[] = "tw_sock_%s"; |
| 1494 | |
| 1495 | timewait_sock_slab_name = kmalloc(strlen(prot->name) + sizeof(mask) - 1, GFP_KERNEL); |
| 1496 | |
| 1497 | if (timewait_sock_slab_name == NULL) |
| 1498 | goto out_free_request_sock_slab; |
| 1499 | |
| 1500 | sprintf(timewait_sock_slab_name, mask, prot->name); |
Arnaldo Carvalho de Melo | 6d6ee43 | 2005-12-13 23:25:19 -0800 | [diff] [blame] | 1501 | prot->twsk_prot->twsk_slab = |
| 1502 | kmem_cache_create(timewait_sock_slab_name, |
| 1503 | prot->twsk_prot->twsk_obj_size, |
| 1504 | 0, SLAB_HWCACHE_ALIGN, |
| 1505 | NULL, NULL); |
| 1506 | if (prot->twsk_prot->twsk_slab == NULL) |
Arnaldo Carvalho de Melo | 8feaf0c | 2005-08-09 20:09:30 -0700 | [diff] [blame] | 1507 | goto out_free_timewait_sock_slab_name; |
| 1508 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1509 | } |
| 1510 | |
Arnaldo Carvalho de Melo | 2a27805 | 2005-04-16 15:24:09 -0700 | [diff] [blame] | 1511 | write_lock(&proto_list_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1512 | list_add(&prot->node, &proto_list); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1513 | write_unlock(&proto_list_lock); |
Arnaldo Carvalho de Melo | 2a27805 | 2005-04-16 15:24:09 -0700 | [diff] [blame] | 1514 | rc = 0; |
| 1515 | out: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1516 | return rc; |
Arnaldo Carvalho de Melo | 8feaf0c | 2005-08-09 20:09:30 -0700 | [diff] [blame] | 1517 | out_free_timewait_sock_slab_name: |
| 1518 | kfree(timewait_sock_slab_name); |
| 1519 | out_free_request_sock_slab: |
| 1520 | if (prot->rsk_prot && prot->rsk_prot->slab) { |
| 1521 | kmem_cache_destroy(prot->rsk_prot->slab); |
| 1522 | prot->rsk_prot->slab = NULL; |
| 1523 | } |
Arnaldo Carvalho de Melo | 2e6599c | 2005-06-18 22:46:52 -0700 | [diff] [blame] | 1524 | out_free_request_sock_slab_name: |
| 1525 | kfree(request_sock_slab_name); |
| 1526 | out_free_sock_slab: |
| 1527 | kmem_cache_destroy(prot->slab); |
| 1528 | prot->slab = NULL; |
| 1529 | goto out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1530 | } |
| 1531 | |
| 1532 | EXPORT_SYMBOL(proto_register); |
| 1533 | |
| 1534 | void proto_unregister(struct proto *prot) |
| 1535 | { |
| 1536 | write_lock(&proto_list_lock); |
Patrick McHardy | 0a3f435 | 2005-09-06 19:47:50 -0700 | [diff] [blame] | 1537 | list_del(&prot->node); |
| 1538 | write_unlock(&proto_list_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1539 | |
| 1540 | if (prot->slab != NULL) { |
| 1541 | kmem_cache_destroy(prot->slab); |
| 1542 | prot->slab = NULL; |
| 1543 | } |
| 1544 | |
Arnaldo Carvalho de Melo | 2e6599c | 2005-06-18 22:46:52 -0700 | [diff] [blame] | 1545 | if (prot->rsk_prot != NULL && prot->rsk_prot->slab != NULL) { |
| 1546 | const char *name = kmem_cache_name(prot->rsk_prot->slab); |
| 1547 | |
| 1548 | kmem_cache_destroy(prot->rsk_prot->slab); |
| 1549 | kfree(name); |
| 1550 | prot->rsk_prot->slab = NULL; |
| 1551 | } |
| 1552 | |
Arnaldo Carvalho de Melo | 6d6ee43 | 2005-12-13 23:25:19 -0800 | [diff] [blame] | 1553 | if (prot->twsk_prot != NULL && prot->twsk_prot->twsk_slab != NULL) { |
| 1554 | const char *name = kmem_cache_name(prot->twsk_prot->twsk_slab); |
Arnaldo Carvalho de Melo | 8feaf0c | 2005-08-09 20:09:30 -0700 | [diff] [blame] | 1555 | |
Arnaldo Carvalho de Melo | 6d6ee43 | 2005-12-13 23:25:19 -0800 | [diff] [blame] | 1556 | kmem_cache_destroy(prot->twsk_prot->twsk_slab); |
Arnaldo Carvalho de Melo | 8feaf0c | 2005-08-09 20:09:30 -0700 | [diff] [blame] | 1557 | kfree(name); |
Arnaldo Carvalho de Melo | 6d6ee43 | 2005-12-13 23:25:19 -0800 | [diff] [blame] | 1558 | prot->twsk_prot->twsk_slab = NULL; |
Arnaldo Carvalho de Melo | 8feaf0c | 2005-08-09 20:09:30 -0700 | [diff] [blame] | 1559 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1560 | } |
| 1561 | |
| 1562 | EXPORT_SYMBOL(proto_unregister); |
| 1563 | |
| 1564 | #ifdef CONFIG_PROC_FS |
| 1565 | static inline struct proto *__proto_head(void) |
| 1566 | { |
| 1567 | return list_entry(proto_list.next, struct proto, node); |
| 1568 | } |
| 1569 | |
| 1570 | static inline struct proto *proto_head(void) |
| 1571 | { |
| 1572 | return list_empty(&proto_list) ? NULL : __proto_head(); |
| 1573 | } |
| 1574 | |
| 1575 | static inline struct proto *proto_next(struct proto *proto) |
| 1576 | { |
| 1577 | return proto->node.next == &proto_list ? NULL : |
| 1578 | list_entry(proto->node.next, struct proto, node); |
| 1579 | } |
| 1580 | |
| 1581 | static inline struct proto *proto_get_idx(loff_t pos) |
| 1582 | { |
| 1583 | struct proto *proto; |
| 1584 | loff_t i = 0; |
| 1585 | |
| 1586 | list_for_each_entry(proto, &proto_list, node) |
| 1587 | if (i++ == pos) |
| 1588 | goto out; |
| 1589 | |
| 1590 | proto = NULL; |
| 1591 | out: |
| 1592 | return proto; |
| 1593 | } |
| 1594 | |
| 1595 | static void *proto_seq_start(struct seq_file *seq, loff_t *pos) |
| 1596 | { |
| 1597 | read_lock(&proto_list_lock); |
| 1598 | return *pos ? proto_get_idx(*pos - 1) : SEQ_START_TOKEN; |
| 1599 | } |
| 1600 | |
| 1601 | static void *proto_seq_next(struct seq_file *seq, void *v, loff_t *pos) |
| 1602 | { |
| 1603 | ++*pos; |
| 1604 | return v == SEQ_START_TOKEN ? proto_head() : proto_next(v); |
| 1605 | } |
| 1606 | |
| 1607 | static void proto_seq_stop(struct seq_file *seq, void *v) |
| 1608 | { |
| 1609 | read_unlock(&proto_list_lock); |
| 1610 | } |
| 1611 | |
| 1612 | static char proto_method_implemented(const void *method) |
| 1613 | { |
| 1614 | return method == NULL ? 'n' : 'y'; |
| 1615 | } |
| 1616 | |
| 1617 | static void proto_seq_printf(struct seq_file *seq, struct proto *proto) |
| 1618 | { |
| 1619 | seq_printf(seq, "%-9s %4u %6d %6d %-3s %6u %-3s %-10s " |
| 1620 | "%2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c\n", |
| 1621 | proto->name, |
| 1622 | proto->obj_size, |
| 1623 | proto->sockets_allocated != NULL ? atomic_read(proto->sockets_allocated) : -1, |
| 1624 | proto->memory_allocated != NULL ? atomic_read(proto->memory_allocated) : -1, |
| 1625 | proto->memory_pressure != NULL ? *proto->memory_pressure ? "yes" : "no" : "NI", |
| 1626 | proto->max_header, |
| 1627 | proto->slab == NULL ? "no" : "yes", |
| 1628 | module_name(proto->owner), |
| 1629 | proto_method_implemented(proto->close), |
| 1630 | proto_method_implemented(proto->connect), |
| 1631 | proto_method_implemented(proto->disconnect), |
| 1632 | proto_method_implemented(proto->accept), |
| 1633 | proto_method_implemented(proto->ioctl), |
| 1634 | proto_method_implemented(proto->init), |
| 1635 | proto_method_implemented(proto->destroy), |
| 1636 | proto_method_implemented(proto->shutdown), |
| 1637 | proto_method_implemented(proto->setsockopt), |
| 1638 | proto_method_implemented(proto->getsockopt), |
| 1639 | proto_method_implemented(proto->sendmsg), |
| 1640 | proto_method_implemented(proto->recvmsg), |
| 1641 | proto_method_implemented(proto->sendpage), |
| 1642 | proto_method_implemented(proto->bind), |
| 1643 | proto_method_implemented(proto->backlog_rcv), |
| 1644 | proto_method_implemented(proto->hash), |
| 1645 | proto_method_implemented(proto->unhash), |
| 1646 | proto_method_implemented(proto->get_port), |
| 1647 | proto_method_implemented(proto->enter_memory_pressure)); |
| 1648 | } |
| 1649 | |
| 1650 | static int proto_seq_show(struct seq_file *seq, void *v) |
| 1651 | { |
| 1652 | if (v == SEQ_START_TOKEN) |
| 1653 | seq_printf(seq, "%-9s %-4s %-8s %-6s %-5s %-7s %-4s %-10s %s", |
| 1654 | "protocol", |
| 1655 | "size", |
| 1656 | "sockets", |
| 1657 | "memory", |
| 1658 | "press", |
| 1659 | "maxhdr", |
| 1660 | "slab", |
| 1661 | "module", |
| 1662 | "cl co di ac io in de sh ss gs se re sp bi br ha uh gp em\n"); |
| 1663 | else |
| 1664 | proto_seq_printf(seq, v); |
| 1665 | return 0; |
| 1666 | } |
| 1667 | |
| 1668 | static struct seq_operations proto_seq_ops = { |
| 1669 | .start = proto_seq_start, |
| 1670 | .next = proto_seq_next, |
| 1671 | .stop = proto_seq_stop, |
| 1672 | .show = proto_seq_show, |
| 1673 | }; |
| 1674 | |
| 1675 | static int proto_seq_open(struct inode *inode, struct file *file) |
| 1676 | { |
| 1677 | return seq_open(file, &proto_seq_ops); |
| 1678 | } |
| 1679 | |
| 1680 | static struct file_operations proto_seq_fops = { |
| 1681 | .owner = THIS_MODULE, |
| 1682 | .open = proto_seq_open, |
| 1683 | .read = seq_read, |
| 1684 | .llseek = seq_lseek, |
| 1685 | .release = seq_release, |
| 1686 | }; |
| 1687 | |
| 1688 | static int __init proto_init(void) |
| 1689 | { |
| 1690 | /* register /proc/net/protocols */ |
| 1691 | return proc_net_fops_create("protocols", S_IRUGO, &proto_seq_fops) == NULL ? -ENOBUFS : 0; |
| 1692 | } |
| 1693 | |
| 1694 | subsys_initcall(proto_init); |
| 1695 | |
| 1696 | #endif /* PROC_FS */ |
| 1697 | |
| 1698 | EXPORT_SYMBOL(sk_alloc); |
| 1699 | EXPORT_SYMBOL(sk_free); |
| 1700 | EXPORT_SYMBOL(sk_send_sigurg); |
| 1701 | EXPORT_SYMBOL(sock_alloc_send_skb); |
| 1702 | EXPORT_SYMBOL(sock_init_data); |
| 1703 | EXPORT_SYMBOL(sock_kfree_s); |
| 1704 | EXPORT_SYMBOL(sock_kmalloc); |
| 1705 | EXPORT_SYMBOL(sock_no_accept); |
| 1706 | EXPORT_SYMBOL(sock_no_bind); |
| 1707 | EXPORT_SYMBOL(sock_no_connect); |
| 1708 | EXPORT_SYMBOL(sock_no_getname); |
| 1709 | EXPORT_SYMBOL(sock_no_getsockopt); |
| 1710 | EXPORT_SYMBOL(sock_no_ioctl); |
| 1711 | EXPORT_SYMBOL(sock_no_listen); |
| 1712 | EXPORT_SYMBOL(sock_no_mmap); |
| 1713 | EXPORT_SYMBOL(sock_no_poll); |
| 1714 | EXPORT_SYMBOL(sock_no_recvmsg); |
| 1715 | EXPORT_SYMBOL(sock_no_sendmsg); |
| 1716 | EXPORT_SYMBOL(sock_no_sendpage); |
| 1717 | EXPORT_SYMBOL(sock_no_setsockopt); |
| 1718 | EXPORT_SYMBOL(sock_no_shutdown); |
| 1719 | EXPORT_SYMBOL(sock_no_socketpair); |
| 1720 | EXPORT_SYMBOL(sock_rfree); |
| 1721 | EXPORT_SYMBOL(sock_setsockopt); |
| 1722 | EXPORT_SYMBOL(sock_wfree); |
| 1723 | EXPORT_SYMBOL(sock_wmalloc); |
| 1724 | EXPORT_SYMBOL(sock_i_uid); |
| 1725 | EXPORT_SYMBOL(sock_i_ino); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1726 | EXPORT_SYMBOL(sysctl_optmem_max); |
David S. Miller | 6baf1f4 | 2005-09-05 18:14:11 -0700 | [diff] [blame] | 1727 | #ifdef CONFIG_SYSCTL |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1728 | EXPORT_SYMBOL(sysctl_rmem_max); |
| 1729 | EXPORT_SYMBOL(sysctl_wmem_max); |
| 1730 | #endif |