Commit | Line | Data |
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1da177e4 LT |
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 | * | |
02c30a84 | 12 | * Authors: Ross Biro |
1da177e4 LT |
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> | |
1da177e4 LT |
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> | |
2e6599cb | 121 | #include <net/request_sock.h> |
1da177e4 LT |
122 | #include <net/sock.h> |
123 | #include <net/xfrm.h> | |
124 | #include <linux/ipsec.h> | |
125 | ||
126 | #include <linux/filter.h> | |
127 | ||
128 | #ifdef CONFIG_INET | |
129 | #include <net/tcp.h> | |
130 | #endif | |
131 | ||
132 | /* Take into consideration the size of the struct sk_buff overhead in the | |
133 | * determination of these values, since that is non-constant across | |
134 | * platforms. This makes socket queueing behavior and performance | |
135 | * not depend upon such differences. | |
136 | */ | |
137 | #define _SK_MEM_PACKETS 256 | |
138 | #define _SK_MEM_OVERHEAD (sizeof(struct sk_buff) + 256) | |
139 | #define SK_WMEM_MAX (_SK_MEM_OVERHEAD * _SK_MEM_PACKETS) | |
140 | #define SK_RMEM_MAX (_SK_MEM_OVERHEAD * _SK_MEM_PACKETS) | |
141 | ||
142 | /* Run time adjustable parameters. */ | |
143 | __u32 sysctl_wmem_max = SK_WMEM_MAX; | |
144 | __u32 sysctl_rmem_max = SK_RMEM_MAX; | |
145 | __u32 sysctl_wmem_default = SK_WMEM_MAX; | |
146 | __u32 sysctl_rmem_default = SK_RMEM_MAX; | |
147 | ||
148 | /* Maximal space eaten by iovec or ancilliary data plus some space */ | |
149 | int sysctl_optmem_max = sizeof(unsigned long)*(2*UIO_MAXIOV + 512); | |
150 | ||
151 | static int sock_set_timeout(long *timeo_p, char __user *optval, int optlen) | |
152 | { | |
153 | struct timeval tv; | |
154 | ||
155 | if (optlen < sizeof(tv)) | |
156 | return -EINVAL; | |
157 | if (copy_from_user(&tv, optval, sizeof(tv))) | |
158 | return -EFAULT; | |
159 | ||
160 | *timeo_p = MAX_SCHEDULE_TIMEOUT; | |
161 | if (tv.tv_sec == 0 && tv.tv_usec == 0) | |
162 | return 0; | |
163 | if (tv.tv_sec < (MAX_SCHEDULE_TIMEOUT/HZ - 1)) | |
164 | *timeo_p = tv.tv_sec*HZ + (tv.tv_usec+(1000000/HZ-1))/(1000000/HZ); | |
165 | return 0; | |
166 | } | |
167 | ||
168 | static void sock_warn_obsolete_bsdism(const char *name) | |
169 | { | |
170 | static int warned; | |
171 | static char warncomm[TASK_COMM_LEN]; | |
172 | if (strcmp(warncomm, current->comm) && warned < 5) { | |
173 | strcpy(warncomm, current->comm); | |
174 | printk(KERN_WARNING "process `%s' is using obsolete " | |
175 | "%s SO_BSDCOMPAT\n", warncomm, name); | |
176 | warned++; | |
177 | } | |
178 | } | |
179 | ||
180 | static void sock_disable_timestamp(struct sock *sk) | |
181 | { | |
182 | if (sock_flag(sk, SOCK_TIMESTAMP)) { | |
183 | sock_reset_flag(sk, SOCK_TIMESTAMP); | |
184 | net_disable_timestamp(); | |
185 | } | |
186 | } | |
187 | ||
188 | ||
189 | /* | |
190 | * This is meant for all protocols to use and covers goings on | |
191 | * at the socket level. Everything here is generic. | |
192 | */ | |
193 | ||
194 | int sock_setsockopt(struct socket *sock, int level, int optname, | |
195 | char __user *optval, int optlen) | |
196 | { | |
197 | struct sock *sk=sock->sk; | |
198 | struct sk_filter *filter; | |
199 | int val; | |
200 | int valbool; | |
201 | struct linger ling; | |
202 | int ret = 0; | |
203 | ||
204 | /* | |
205 | * Options without arguments | |
206 | */ | |
207 | ||
208 | #ifdef SO_DONTLINGER /* Compatibility item... */ | |
a77be819 KM |
209 | if (optname == SO_DONTLINGER) { |
210 | lock_sock(sk); | |
211 | sock_reset_flag(sk, SOCK_LINGER); | |
212 | release_sock(sk); | |
213 | return 0; | |
1da177e4 | 214 | } |
a77be819 KM |
215 | #endif |
216 | ||
1da177e4 LT |
217 | if(optlen<sizeof(int)) |
218 | return(-EINVAL); | |
219 | ||
220 | if (get_user(val, (int __user *)optval)) | |
221 | return -EFAULT; | |
222 | ||
223 | valbool = val?1:0; | |
224 | ||
225 | lock_sock(sk); | |
226 | ||
227 | switch(optname) | |
228 | { | |
229 | case SO_DEBUG: | |
230 | if(val && !capable(CAP_NET_ADMIN)) | |
231 | { | |
232 | ret = -EACCES; | |
233 | } | |
234 | else if (valbool) | |
235 | sock_set_flag(sk, SOCK_DBG); | |
236 | else | |
237 | sock_reset_flag(sk, SOCK_DBG); | |
238 | break; | |
239 | case SO_REUSEADDR: | |
240 | sk->sk_reuse = valbool; | |
241 | break; | |
242 | case SO_TYPE: | |
243 | case SO_ERROR: | |
244 | ret = -ENOPROTOOPT; | |
245 | break; | |
246 | case SO_DONTROUTE: | |
247 | if (valbool) | |
248 | sock_set_flag(sk, SOCK_LOCALROUTE); | |
249 | else | |
250 | sock_reset_flag(sk, SOCK_LOCALROUTE); | |
251 | break; | |
252 | case SO_BROADCAST: | |
253 | sock_valbool_flag(sk, SOCK_BROADCAST, valbool); | |
254 | break; | |
255 | case SO_SNDBUF: | |
256 | /* Don't error on this BSD doesn't and if you think | |
257 | about it this is right. Otherwise apps have to | |
258 | play 'guess the biggest size' games. RCVBUF/SNDBUF | |
259 | are treated in BSD as hints */ | |
260 | ||
261 | if (val > sysctl_wmem_max) | |
262 | val = sysctl_wmem_max; | |
263 | ||
264 | sk->sk_userlocks |= SOCK_SNDBUF_LOCK; | |
265 | if ((val * 2) < SOCK_MIN_SNDBUF) | |
266 | sk->sk_sndbuf = SOCK_MIN_SNDBUF; | |
267 | else | |
268 | sk->sk_sndbuf = val * 2; | |
269 | ||
270 | /* | |
271 | * Wake up sending tasks if we | |
272 | * upped the value. | |
273 | */ | |
274 | sk->sk_write_space(sk); | |
275 | break; | |
276 | ||
277 | case SO_RCVBUF: | |
278 | /* Don't error on this BSD doesn't and if you think | |
279 | about it this is right. Otherwise apps have to | |
280 | play 'guess the biggest size' games. RCVBUF/SNDBUF | |
281 | are treated in BSD as hints */ | |
282 | ||
283 | if (val > sysctl_rmem_max) | |
284 | val = sysctl_rmem_max; | |
285 | ||
286 | sk->sk_userlocks |= SOCK_RCVBUF_LOCK; | |
287 | /* FIXME: is this lower bound the right one? */ | |
288 | if ((val * 2) < SOCK_MIN_RCVBUF) | |
289 | sk->sk_rcvbuf = SOCK_MIN_RCVBUF; | |
290 | else | |
291 | sk->sk_rcvbuf = val * 2; | |
292 | break; | |
293 | ||
294 | case SO_KEEPALIVE: | |
295 | #ifdef CONFIG_INET | |
296 | if (sk->sk_protocol == IPPROTO_TCP) | |
297 | tcp_set_keepalive(sk, valbool); | |
298 | #endif | |
299 | sock_valbool_flag(sk, SOCK_KEEPOPEN, valbool); | |
300 | break; | |
301 | ||
302 | case SO_OOBINLINE: | |
303 | sock_valbool_flag(sk, SOCK_URGINLINE, valbool); | |
304 | break; | |
305 | ||
306 | case SO_NO_CHECK: | |
307 | sk->sk_no_check = valbool; | |
308 | break; | |
309 | ||
310 | case SO_PRIORITY: | |
311 | if ((val >= 0 && val <= 6) || capable(CAP_NET_ADMIN)) | |
312 | sk->sk_priority = val; | |
313 | else | |
314 | ret = -EPERM; | |
315 | break; | |
316 | ||
317 | case SO_LINGER: | |
318 | if(optlen<sizeof(ling)) { | |
319 | ret = -EINVAL; /* 1003.1g */ | |
320 | break; | |
321 | } | |
322 | if (copy_from_user(&ling,optval,sizeof(ling))) { | |
323 | ret = -EFAULT; | |
324 | break; | |
325 | } | |
326 | if (!ling.l_onoff) | |
327 | sock_reset_flag(sk, SOCK_LINGER); | |
328 | else { | |
329 | #if (BITS_PER_LONG == 32) | |
330 | if (ling.l_linger >= MAX_SCHEDULE_TIMEOUT/HZ) | |
331 | sk->sk_lingertime = MAX_SCHEDULE_TIMEOUT; | |
332 | else | |
333 | #endif | |
334 | sk->sk_lingertime = ling.l_linger * HZ; | |
335 | sock_set_flag(sk, SOCK_LINGER); | |
336 | } | |
337 | break; | |
338 | ||
339 | case SO_BSDCOMPAT: | |
340 | sock_warn_obsolete_bsdism("setsockopt"); | |
341 | break; | |
342 | ||
343 | case SO_PASSCRED: | |
344 | if (valbool) | |
345 | set_bit(SOCK_PASSCRED, &sock->flags); | |
346 | else | |
347 | clear_bit(SOCK_PASSCRED, &sock->flags); | |
348 | break; | |
349 | ||
350 | case SO_TIMESTAMP: | |
351 | if (valbool) { | |
352 | sock_set_flag(sk, SOCK_RCVTSTAMP); | |
353 | sock_enable_timestamp(sk); | |
354 | } else | |
355 | sock_reset_flag(sk, SOCK_RCVTSTAMP); | |
356 | break; | |
357 | ||
358 | case SO_RCVLOWAT: | |
359 | if (val < 0) | |
360 | val = INT_MAX; | |
361 | sk->sk_rcvlowat = val ? : 1; | |
362 | break; | |
363 | ||
364 | case SO_RCVTIMEO: | |
365 | ret = sock_set_timeout(&sk->sk_rcvtimeo, optval, optlen); | |
366 | break; | |
367 | ||
368 | case SO_SNDTIMEO: | |
369 | ret = sock_set_timeout(&sk->sk_sndtimeo, optval, optlen); | |
370 | break; | |
371 | ||
372 | #ifdef CONFIG_NETDEVICES | |
373 | case SO_BINDTODEVICE: | |
374 | { | |
375 | char devname[IFNAMSIZ]; | |
376 | ||
377 | /* Sorry... */ | |
378 | if (!capable(CAP_NET_RAW)) { | |
379 | ret = -EPERM; | |
380 | break; | |
381 | } | |
382 | ||
383 | /* Bind this socket to a particular device like "eth0", | |
384 | * as specified in the passed interface name. If the | |
385 | * name is "" or the option length is zero the socket | |
386 | * is not bound. | |
387 | */ | |
388 | ||
389 | if (!valbool) { | |
390 | sk->sk_bound_dev_if = 0; | |
391 | } else { | |
392 | if (optlen > IFNAMSIZ) | |
393 | optlen = IFNAMSIZ; | |
394 | if (copy_from_user(devname, optval, optlen)) { | |
395 | ret = -EFAULT; | |
396 | break; | |
397 | } | |
398 | ||
399 | /* Remove any cached route for this socket. */ | |
400 | sk_dst_reset(sk); | |
401 | ||
402 | if (devname[0] == '\0') { | |
403 | sk->sk_bound_dev_if = 0; | |
404 | } else { | |
405 | struct net_device *dev = dev_get_by_name(devname); | |
406 | if (!dev) { | |
407 | ret = -ENODEV; | |
408 | break; | |
409 | } | |
410 | sk->sk_bound_dev_if = dev->ifindex; | |
411 | dev_put(dev); | |
412 | } | |
413 | } | |
414 | break; | |
415 | } | |
416 | #endif | |
417 | ||
418 | ||
419 | case SO_ATTACH_FILTER: | |
420 | ret = -EINVAL; | |
421 | if (optlen == sizeof(struct sock_fprog)) { | |
422 | struct sock_fprog fprog; | |
423 | ||
424 | ret = -EFAULT; | |
425 | if (copy_from_user(&fprog, optval, sizeof(fprog))) | |
426 | break; | |
427 | ||
428 | ret = sk_attach_filter(&fprog, sk); | |
429 | } | |
430 | break; | |
431 | ||
432 | case SO_DETACH_FILTER: | |
433 | spin_lock_bh(&sk->sk_lock.slock); | |
434 | filter = sk->sk_filter; | |
435 | if (filter) { | |
436 | sk->sk_filter = NULL; | |
437 | spin_unlock_bh(&sk->sk_lock.slock); | |
438 | sk_filter_release(sk, filter); | |
439 | break; | |
440 | } | |
441 | spin_unlock_bh(&sk->sk_lock.slock); | |
442 | ret = -ENONET; | |
443 | break; | |
444 | ||
445 | /* We implement the SO_SNDLOWAT etc to | |
446 | not be settable (1003.1g 5.3) */ | |
447 | default: | |
448 | ret = -ENOPROTOOPT; | |
449 | break; | |
450 | } | |
451 | release_sock(sk); | |
452 | return ret; | |
453 | } | |
454 | ||
455 | ||
456 | int sock_getsockopt(struct socket *sock, int level, int optname, | |
457 | char __user *optval, int __user *optlen) | |
458 | { | |
459 | struct sock *sk = sock->sk; | |
460 | ||
461 | union | |
462 | { | |
463 | int val; | |
464 | struct linger ling; | |
465 | struct timeval tm; | |
466 | } v; | |
467 | ||
468 | unsigned int lv = sizeof(int); | |
469 | int len; | |
470 | ||
471 | if(get_user(len,optlen)) | |
472 | return -EFAULT; | |
473 | if(len < 0) | |
474 | return -EINVAL; | |
475 | ||
476 | switch(optname) | |
477 | { | |
478 | case SO_DEBUG: | |
479 | v.val = sock_flag(sk, SOCK_DBG); | |
480 | break; | |
481 | ||
482 | case SO_DONTROUTE: | |
483 | v.val = sock_flag(sk, SOCK_LOCALROUTE); | |
484 | break; | |
485 | ||
486 | case SO_BROADCAST: | |
487 | v.val = !!sock_flag(sk, SOCK_BROADCAST); | |
488 | break; | |
489 | ||
490 | case SO_SNDBUF: | |
491 | v.val = sk->sk_sndbuf; | |
492 | break; | |
493 | ||
494 | case SO_RCVBUF: | |
495 | v.val = sk->sk_rcvbuf; | |
496 | break; | |
497 | ||
498 | case SO_REUSEADDR: | |
499 | v.val = sk->sk_reuse; | |
500 | break; | |
501 | ||
502 | case SO_KEEPALIVE: | |
503 | v.val = !!sock_flag(sk, SOCK_KEEPOPEN); | |
504 | break; | |
505 | ||
506 | case SO_TYPE: | |
507 | v.val = sk->sk_type; | |
508 | break; | |
509 | ||
510 | case SO_ERROR: | |
511 | v.val = -sock_error(sk); | |
512 | if(v.val==0) | |
513 | v.val = xchg(&sk->sk_err_soft, 0); | |
514 | break; | |
515 | ||
516 | case SO_OOBINLINE: | |
517 | v.val = !!sock_flag(sk, SOCK_URGINLINE); | |
518 | break; | |
519 | ||
520 | case SO_NO_CHECK: | |
521 | v.val = sk->sk_no_check; | |
522 | break; | |
523 | ||
524 | case SO_PRIORITY: | |
525 | v.val = sk->sk_priority; | |
526 | break; | |
527 | ||
528 | case SO_LINGER: | |
529 | lv = sizeof(v.ling); | |
530 | v.ling.l_onoff = !!sock_flag(sk, SOCK_LINGER); | |
531 | v.ling.l_linger = sk->sk_lingertime / HZ; | |
532 | break; | |
533 | ||
534 | case SO_BSDCOMPAT: | |
535 | sock_warn_obsolete_bsdism("getsockopt"); | |
536 | break; | |
537 | ||
538 | case SO_TIMESTAMP: | |
539 | v.val = sock_flag(sk, SOCK_RCVTSTAMP); | |
540 | break; | |
541 | ||
542 | case SO_RCVTIMEO: | |
543 | lv=sizeof(struct timeval); | |
544 | if (sk->sk_rcvtimeo == MAX_SCHEDULE_TIMEOUT) { | |
545 | v.tm.tv_sec = 0; | |
546 | v.tm.tv_usec = 0; | |
547 | } else { | |
548 | v.tm.tv_sec = sk->sk_rcvtimeo / HZ; | |
549 | v.tm.tv_usec = ((sk->sk_rcvtimeo % HZ) * 1000000) / HZ; | |
550 | } | |
551 | break; | |
552 | ||
553 | case SO_SNDTIMEO: | |
554 | lv=sizeof(struct timeval); | |
555 | if (sk->sk_sndtimeo == MAX_SCHEDULE_TIMEOUT) { | |
556 | v.tm.tv_sec = 0; | |
557 | v.tm.tv_usec = 0; | |
558 | } else { | |
559 | v.tm.tv_sec = sk->sk_sndtimeo / HZ; | |
560 | v.tm.tv_usec = ((sk->sk_sndtimeo % HZ) * 1000000) / HZ; | |
561 | } | |
562 | break; | |
563 | ||
564 | case SO_RCVLOWAT: | |
565 | v.val = sk->sk_rcvlowat; | |
566 | break; | |
567 | ||
568 | case SO_SNDLOWAT: | |
569 | v.val=1; | |
570 | break; | |
571 | ||
572 | case SO_PASSCRED: | |
573 | v.val = test_bit(SOCK_PASSCRED, &sock->flags) ? 1 : 0; | |
574 | break; | |
575 | ||
576 | case SO_PEERCRED: | |
577 | if (len > sizeof(sk->sk_peercred)) | |
578 | len = sizeof(sk->sk_peercred); | |
579 | if (copy_to_user(optval, &sk->sk_peercred, len)) | |
580 | return -EFAULT; | |
581 | goto lenout; | |
582 | ||
583 | case SO_PEERNAME: | |
584 | { | |
585 | char address[128]; | |
586 | ||
587 | if (sock->ops->getname(sock, (struct sockaddr *)address, &lv, 2)) | |
588 | return -ENOTCONN; | |
589 | if (lv < len) | |
590 | return -EINVAL; | |
591 | if (copy_to_user(optval, address, len)) | |
592 | return -EFAULT; | |
593 | goto lenout; | |
594 | } | |
595 | ||
596 | /* Dubious BSD thing... Probably nobody even uses it, but | |
597 | * the UNIX standard wants it for whatever reason... -DaveM | |
598 | */ | |
599 | case SO_ACCEPTCONN: | |
600 | v.val = sk->sk_state == TCP_LISTEN; | |
601 | break; | |
602 | ||
603 | case SO_PEERSEC: | |
604 | return security_socket_getpeersec(sock, optval, optlen, len); | |
605 | ||
606 | default: | |
607 | return(-ENOPROTOOPT); | |
608 | } | |
609 | if (len > lv) | |
610 | len = lv; | |
611 | if (copy_to_user(optval, &v, len)) | |
612 | return -EFAULT; | |
613 | lenout: | |
614 | if (put_user(len, optlen)) | |
615 | return -EFAULT; | |
616 | return 0; | |
617 | } | |
618 | ||
619 | /** | |
620 | * sk_alloc - All socket objects are allocated here | |
4dc3b16b PP |
621 | * @family: protocol family |
622 | * @priority: for allocation (%GFP_KERNEL, %GFP_ATOMIC, etc) | |
623 | * @prot: struct proto associated with this new sock instance | |
624 | * @zero_it: if we should zero the newly allocated sock | |
1da177e4 | 625 | */ |
86a76caf VF |
626 | struct sock *sk_alloc(int family, unsigned int __nocast priority, |
627 | struct proto *prot, int zero_it) | |
1da177e4 LT |
628 | { |
629 | struct sock *sk = NULL; | |
630 | kmem_cache_t *slab = prot->slab; | |
631 | ||
632 | if (slab != NULL) | |
633 | sk = kmem_cache_alloc(slab, priority); | |
634 | else | |
635 | sk = kmalloc(prot->obj_size, priority); | |
636 | ||
637 | if (sk) { | |
638 | if (zero_it) { | |
639 | memset(sk, 0, prot->obj_size); | |
640 | sk->sk_family = family; | |
476e19cf ACM |
641 | /* |
642 | * See comment in struct sock definition to understand | |
643 | * why we need sk_prot_creator -acme | |
644 | */ | |
645 | sk->sk_prot = sk->sk_prot_creator = prot; | |
1da177e4 LT |
646 | sock_lock_init(sk); |
647 | } | |
648 | ||
649 | if (security_sk_alloc(sk, family, priority)) { | |
88a66858 ACM |
650 | if (slab != NULL) |
651 | kmem_cache_free(slab, sk); | |
652 | else | |
653 | kfree(sk); | |
1da177e4 LT |
654 | sk = NULL; |
655 | } else | |
656 | __module_get(prot->owner); | |
657 | } | |
658 | return sk; | |
659 | } | |
660 | ||
661 | void sk_free(struct sock *sk) | |
662 | { | |
663 | struct sk_filter *filter; | |
476e19cf | 664 | struct module *owner = sk->sk_prot_creator->owner; |
1da177e4 LT |
665 | |
666 | if (sk->sk_destruct) | |
667 | sk->sk_destruct(sk); | |
668 | ||
669 | filter = sk->sk_filter; | |
670 | if (filter) { | |
671 | sk_filter_release(sk, filter); | |
672 | sk->sk_filter = NULL; | |
673 | } | |
674 | ||
675 | sock_disable_timestamp(sk); | |
676 | ||
677 | if (atomic_read(&sk->sk_omem_alloc)) | |
678 | printk(KERN_DEBUG "%s: optmem leakage (%d bytes) detected.\n", | |
679 | __FUNCTION__, atomic_read(&sk->sk_omem_alloc)); | |
680 | ||
681 | security_sk_free(sk); | |
476e19cf ACM |
682 | if (sk->sk_prot_creator->slab != NULL) |
683 | kmem_cache_free(sk->sk_prot_creator->slab, sk); | |
1da177e4 LT |
684 | else |
685 | kfree(sk); | |
686 | module_put(owner); | |
687 | } | |
688 | ||
689 | void __init sk_init(void) | |
690 | { | |
691 | if (num_physpages <= 4096) { | |
692 | sysctl_wmem_max = 32767; | |
693 | sysctl_rmem_max = 32767; | |
694 | sysctl_wmem_default = 32767; | |
695 | sysctl_rmem_default = 32767; | |
696 | } else if (num_physpages >= 131072) { | |
697 | sysctl_wmem_max = 131071; | |
698 | sysctl_rmem_max = 131071; | |
699 | } | |
700 | } | |
701 | ||
702 | /* | |
703 | * Simple resource managers for sockets. | |
704 | */ | |
705 | ||
706 | ||
707 | /* | |
708 | * Write buffer destructor automatically called from kfree_skb. | |
709 | */ | |
710 | void sock_wfree(struct sk_buff *skb) | |
711 | { | |
712 | struct sock *sk = skb->sk; | |
713 | ||
714 | /* In case it might be waiting for more memory. */ | |
715 | atomic_sub(skb->truesize, &sk->sk_wmem_alloc); | |
716 | if (!sock_flag(sk, SOCK_USE_WRITE_QUEUE)) | |
717 | sk->sk_write_space(sk); | |
718 | sock_put(sk); | |
719 | } | |
720 | ||
721 | /* | |
722 | * Read buffer destructor automatically called from kfree_skb. | |
723 | */ | |
724 | void sock_rfree(struct sk_buff *skb) | |
725 | { | |
726 | struct sock *sk = skb->sk; | |
727 | ||
728 | atomic_sub(skb->truesize, &sk->sk_rmem_alloc); | |
729 | } | |
730 | ||
731 | ||
732 | int sock_i_uid(struct sock *sk) | |
733 | { | |
734 | int uid; | |
735 | ||
736 | read_lock(&sk->sk_callback_lock); | |
737 | uid = sk->sk_socket ? SOCK_INODE(sk->sk_socket)->i_uid : 0; | |
738 | read_unlock(&sk->sk_callback_lock); | |
739 | return uid; | |
740 | } | |
741 | ||
742 | unsigned long sock_i_ino(struct sock *sk) | |
743 | { | |
744 | unsigned long ino; | |
745 | ||
746 | read_lock(&sk->sk_callback_lock); | |
747 | ino = sk->sk_socket ? SOCK_INODE(sk->sk_socket)->i_ino : 0; | |
748 | read_unlock(&sk->sk_callback_lock); | |
749 | return ino; | |
750 | } | |
751 | ||
752 | /* | |
753 | * Allocate a skb from the socket's send buffer. | |
754 | */ | |
86a76caf VF |
755 | struct sk_buff *sock_wmalloc(struct sock *sk, unsigned long size, int force, |
756 | unsigned int __nocast priority) | |
1da177e4 LT |
757 | { |
758 | if (force || atomic_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf) { | |
759 | struct sk_buff * skb = alloc_skb(size, priority); | |
760 | if (skb) { | |
761 | skb_set_owner_w(skb, sk); | |
762 | return skb; | |
763 | } | |
764 | } | |
765 | return NULL; | |
766 | } | |
767 | ||
768 | /* | |
769 | * Allocate a skb from the socket's receive buffer. | |
770 | */ | |
86a76caf VF |
771 | struct sk_buff *sock_rmalloc(struct sock *sk, unsigned long size, int force, |
772 | unsigned int __nocast priority) | |
1da177e4 LT |
773 | { |
774 | if (force || atomic_read(&sk->sk_rmem_alloc) < sk->sk_rcvbuf) { | |
775 | struct sk_buff *skb = alloc_skb(size, priority); | |
776 | if (skb) { | |
777 | skb_set_owner_r(skb, sk); | |
778 | return skb; | |
779 | } | |
780 | } | |
781 | return NULL; | |
782 | } | |
783 | ||
784 | /* | |
785 | * Allocate a memory block from the socket's option memory buffer. | |
786 | */ | |
86a76caf | 787 | void *sock_kmalloc(struct sock *sk, int size, unsigned int __nocast priority) |
1da177e4 LT |
788 | { |
789 | if ((unsigned)size <= sysctl_optmem_max && | |
790 | atomic_read(&sk->sk_omem_alloc) + size < sysctl_optmem_max) { | |
791 | void *mem; | |
792 | /* First do the add, to avoid the race if kmalloc | |
793 | * might sleep. | |
794 | */ | |
795 | atomic_add(size, &sk->sk_omem_alloc); | |
796 | mem = kmalloc(size, priority); | |
797 | if (mem) | |
798 | return mem; | |
799 | atomic_sub(size, &sk->sk_omem_alloc); | |
800 | } | |
801 | return NULL; | |
802 | } | |
803 | ||
804 | /* | |
805 | * Free an option memory block. | |
806 | */ | |
807 | void sock_kfree_s(struct sock *sk, void *mem, int size) | |
808 | { | |
809 | kfree(mem); | |
810 | atomic_sub(size, &sk->sk_omem_alloc); | |
811 | } | |
812 | ||
813 | /* It is almost wait_for_tcp_memory minus release_sock/lock_sock. | |
814 | I think, these locks should be removed for datagram sockets. | |
815 | */ | |
816 | static long sock_wait_for_wmem(struct sock * sk, long timeo) | |
817 | { | |
818 | DEFINE_WAIT(wait); | |
819 | ||
820 | clear_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags); | |
821 | for (;;) { | |
822 | if (!timeo) | |
823 | break; | |
824 | if (signal_pending(current)) | |
825 | break; | |
826 | set_bit(SOCK_NOSPACE, &sk->sk_socket->flags); | |
827 | prepare_to_wait(sk->sk_sleep, &wait, TASK_INTERRUPTIBLE); | |
828 | if (atomic_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf) | |
829 | break; | |
830 | if (sk->sk_shutdown & SEND_SHUTDOWN) | |
831 | break; | |
832 | if (sk->sk_err) | |
833 | break; | |
834 | timeo = schedule_timeout(timeo); | |
835 | } | |
836 | finish_wait(sk->sk_sleep, &wait); | |
837 | return timeo; | |
838 | } | |
839 | ||
840 | ||
841 | /* | |
842 | * Generic send/receive buffer handlers | |
843 | */ | |
844 | ||
845 | static struct sk_buff *sock_alloc_send_pskb(struct sock *sk, | |
846 | unsigned long header_len, | |
847 | unsigned long data_len, | |
848 | int noblock, int *errcode) | |
849 | { | |
850 | struct sk_buff *skb; | |
851 | unsigned int gfp_mask; | |
852 | long timeo; | |
853 | int err; | |
854 | ||
855 | gfp_mask = sk->sk_allocation; | |
856 | if (gfp_mask & __GFP_WAIT) | |
857 | gfp_mask |= __GFP_REPEAT; | |
858 | ||
859 | timeo = sock_sndtimeo(sk, noblock); | |
860 | while (1) { | |
861 | err = sock_error(sk); | |
862 | if (err != 0) | |
863 | goto failure; | |
864 | ||
865 | err = -EPIPE; | |
866 | if (sk->sk_shutdown & SEND_SHUTDOWN) | |
867 | goto failure; | |
868 | ||
869 | if (atomic_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf) { | |
870 | skb = alloc_skb(header_len, sk->sk_allocation); | |
871 | if (skb) { | |
872 | int npages; | |
873 | int i; | |
874 | ||
875 | /* No pages, we're done... */ | |
876 | if (!data_len) | |
877 | break; | |
878 | ||
879 | npages = (data_len + (PAGE_SIZE - 1)) >> PAGE_SHIFT; | |
880 | skb->truesize += data_len; | |
881 | skb_shinfo(skb)->nr_frags = npages; | |
882 | for (i = 0; i < npages; i++) { | |
883 | struct page *page; | |
884 | skb_frag_t *frag; | |
885 | ||
886 | page = alloc_pages(sk->sk_allocation, 0); | |
887 | if (!page) { | |
888 | err = -ENOBUFS; | |
889 | skb_shinfo(skb)->nr_frags = i; | |
890 | kfree_skb(skb); | |
891 | goto failure; | |
892 | } | |
893 | ||
894 | frag = &skb_shinfo(skb)->frags[i]; | |
895 | frag->page = page; | |
896 | frag->page_offset = 0; | |
897 | frag->size = (data_len >= PAGE_SIZE ? | |
898 | PAGE_SIZE : | |
899 | data_len); | |
900 | data_len -= PAGE_SIZE; | |
901 | } | |
902 | ||
903 | /* Full success... */ | |
904 | break; | |
905 | } | |
906 | err = -ENOBUFS; | |
907 | goto failure; | |
908 | } | |
909 | set_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags); | |
910 | set_bit(SOCK_NOSPACE, &sk->sk_socket->flags); | |
911 | err = -EAGAIN; | |
912 | if (!timeo) | |
913 | goto failure; | |
914 | if (signal_pending(current)) | |
915 | goto interrupted; | |
916 | timeo = sock_wait_for_wmem(sk, timeo); | |
917 | } | |
918 | ||
919 | skb_set_owner_w(skb, sk); | |
920 | return skb; | |
921 | ||
922 | interrupted: | |
923 | err = sock_intr_errno(timeo); | |
924 | failure: | |
925 | *errcode = err; | |
926 | return NULL; | |
927 | } | |
928 | ||
929 | struct sk_buff *sock_alloc_send_skb(struct sock *sk, unsigned long size, | |
930 | int noblock, int *errcode) | |
931 | { | |
932 | return sock_alloc_send_pskb(sk, size, 0, noblock, errcode); | |
933 | } | |
934 | ||
935 | static void __lock_sock(struct sock *sk) | |
936 | { | |
937 | DEFINE_WAIT(wait); | |
938 | ||
939 | for(;;) { | |
940 | prepare_to_wait_exclusive(&sk->sk_lock.wq, &wait, | |
941 | TASK_UNINTERRUPTIBLE); | |
942 | spin_unlock_bh(&sk->sk_lock.slock); | |
943 | schedule(); | |
944 | spin_lock_bh(&sk->sk_lock.slock); | |
945 | if(!sock_owned_by_user(sk)) | |
946 | break; | |
947 | } | |
948 | finish_wait(&sk->sk_lock.wq, &wait); | |
949 | } | |
950 | ||
951 | static void __release_sock(struct sock *sk) | |
952 | { | |
953 | struct sk_buff *skb = sk->sk_backlog.head; | |
954 | ||
955 | do { | |
956 | sk->sk_backlog.head = sk->sk_backlog.tail = NULL; | |
957 | bh_unlock_sock(sk); | |
958 | ||
959 | do { | |
960 | struct sk_buff *next = skb->next; | |
961 | ||
962 | skb->next = NULL; | |
963 | sk->sk_backlog_rcv(sk, skb); | |
964 | ||
965 | /* | |
966 | * We are in process context here with softirqs | |
967 | * disabled, use cond_resched_softirq() to preempt. | |
968 | * This is safe to do because we've taken the backlog | |
969 | * queue private: | |
970 | */ | |
971 | cond_resched_softirq(); | |
972 | ||
973 | skb = next; | |
974 | } while (skb != NULL); | |
975 | ||
976 | bh_lock_sock(sk); | |
977 | } while((skb = sk->sk_backlog.head) != NULL); | |
978 | } | |
979 | ||
980 | /** | |
981 | * sk_wait_data - wait for data to arrive at sk_receive_queue | |
4dc3b16b PP |
982 | * @sk: sock to wait on |
983 | * @timeo: for how long | |
1da177e4 LT |
984 | * |
985 | * Now socket state including sk->sk_err is changed only under lock, | |
986 | * hence we may omit checks after joining wait queue. | |
987 | * We check receive queue before schedule() only as optimization; | |
988 | * it is very likely that release_sock() added new data. | |
989 | */ | |
990 | int sk_wait_data(struct sock *sk, long *timeo) | |
991 | { | |
992 | int rc; | |
993 | DEFINE_WAIT(wait); | |
994 | ||
995 | prepare_to_wait(sk->sk_sleep, &wait, TASK_INTERRUPTIBLE); | |
996 | set_bit(SOCK_ASYNC_WAITDATA, &sk->sk_socket->flags); | |
997 | rc = sk_wait_event(sk, timeo, !skb_queue_empty(&sk->sk_receive_queue)); | |
998 | clear_bit(SOCK_ASYNC_WAITDATA, &sk->sk_socket->flags); | |
999 | finish_wait(sk->sk_sleep, &wait); | |
1000 | return rc; | |
1001 | } | |
1002 | ||
1003 | EXPORT_SYMBOL(sk_wait_data); | |
1004 | ||
1005 | /* | |
1006 | * Set of default routines for initialising struct proto_ops when | |
1007 | * the protocol does not support a particular function. In certain | |
1008 | * cases where it makes no sense for a protocol to have a "do nothing" | |
1009 | * function, some default processing is provided. | |
1010 | */ | |
1011 | ||
1012 | int sock_no_bind(struct socket *sock, struct sockaddr *saddr, int len) | |
1013 | { | |
1014 | return -EOPNOTSUPP; | |
1015 | } | |
1016 | ||
1017 | int sock_no_connect(struct socket *sock, struct sockaddr *saddr, | |
1018 | int len, int flags) | |
1019 | { | |
1020 | return -EOPNOTSUPP; | |
1021 | } | |
1022 | ||
1023 | int sock_no_socketpair(struct socket *sock1, struct socket *sock2) | |
1024 | { | |
1025 | return -EOPNOTSUPP; | |
1026 | } | |
1027 | ||
1028 | int sock_no_accept(struct socket *sock, struct socket *newsock, int flags) | |
1029 | { | |
1030 | return -EOPNOTSUPP; | |
1031 | } | |
1032 | ||
1033 | int sock_no_getname(struct socket *sock, struct sockaddr *saddr, | |
1034 | int *len, int peer) | |
1035 | { | |
1036 | return -EOPNOTSUPP; | |
1037 | } | |
1038 | ||
1039 | unsigned int sock_no_poll(struct file * file, struct socket *sock, poll_table *pt) | |
1040 | { | |
1041 | return 0; | |
1042 | } | |
1043 | ||
1044 | int sock_no_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg) | |
1045 | { | |
1046 | return -EOPNOTSUPP; | |
1047 | } | |
1048 | ||
1049 | int sock_no_listen(struct socket *sock, int backlog) | |
1050 | { | |
1051 | return -EOPNOTSUPP; | |
1052 | } | |
1053 | ||
1054 | int sock_no_shutdown(struct socket *sock, int how) | |
1055 | { | |
1056 | return -EOPNOTSUPP; | |
1057 | } | |
1058 | ||
1059 | int sock_no_setsockopt(struct socket *sock, int level, int optname, | |
1060 | char __user *optval, int optlen) | |
1061 | { | |
1062 | return -EOPNOTSUPP; | |
1063 | } | |
1064 | ||
1065 | int sock_no_getsockopt(struct socket *sock, int level, int optname, | |
1066 | char __user *optval, int __user *optlen) | |
1067 | { | |
1068 | return -EOPNOTSUPP; | |
1069 | } | |
1070 | ||
1071 | int sock_no_sendmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *m, | |
1072 | size_t len) | |
1073 | { | |
1074 | return -EOPNOTSUPP; | |
1075 | } | |
1076 | ||
1077 | int sock_no_recvmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *m, | |
1078 | size_t len, int flags) | |
1079 | { | |
1080 | return -EOPNOTSUPP; | |
1081 | } | |
1082 | ||
1083 | int sock_no_mmap(struct file *file, struct socket *sock, struct vm_area_struct *vma) | |
1084 | { | |
1085 | /* Mirror missing mmap method error code */ | |
1086 | return -ENODEV; | |
1087 | } | |
1088 | ||
1089 | ssize_t sock_no_sendpage(struct socket *sock, struct page *page, int offset, size_t size, int flags) | |
1090 | { | |
1091 | ssize_t res; | |
1092 | struct msghdr msg = {.msg_flags = flags}; | |
1093 | struct kvec iov; | |
1094 | char *kaddr = kmap(page); | |
1095 | iov.iov_base = kaddr + offset; | |
1096 | iov.iov_len = size; | |
1097 | res = kernel_sendmsg(sock, &msg, &iov, 1, size); | |
1098 | kunmap(page); | |
1099 | return res; | |
1100 | } | |
1101 | ||
1102 | /* | |
1103 | * Default Socket Callbacks | |
1104 | */ | |
1105 | ||
1106 | static void sock_def_wakeup(struct sock *sk) | |
1107 | { | |
1108 | read_lock(&sk->sk_callback_lock); | |
1109 | if (sk->sk_sleep && waitqueue_active(sk->sk_sleep)) | |
1110 | wake_up_interruptible_all(sk->sk_sleep); | |
1111 | read_unlock(&sk->sk_callback_lock); | |
1112 | } | |
1113 | ||
1114 | static void sock_def_error_report(struct sock *sk) | |
1115 | { | |
1116 | read_lock(&sk->sk_callback_lock); | |
1117 | if (sk->sk_sleep && waitqueue_active(sk->sk_sleep)) | |
1118 | wake_up_interruptible(sk->sk_sleep); | |
1119 | sk_wake_async(sk,0,POLL_ERR); | |
1120 | read_unlock(&sk->sk_callback_lock); | |
1121 | } | |
1122 | ||
1123 | static void sock_def_readable(struct sock *sk, int len) | |
1124 | { | |
1125 | read_lock(&sk->sk_callback_lock); | |
1126 | if (sk->sk_sleep && waitqueue_active(sk->sk_sleep)) | |
1127 | wake_up_interruptible(sk->sk_sleep); | |
1128 | sk_wake_async(sk,1,POLL_IN); | |
1129 | read_unlock(&sk->sk_callback_lock); | |
1130 | } | |
1131 | ||
1132 | static void sock_def_write_space(struct sock *sk) | |
1133 | { | |
1134 | read_lock(&sk->sk_callback_lock); | |
1135 | ||
1136 | /* Do not wake up a writer until he can make "significant" | |
1137 | * progress. --DaveM | |
1138 | */ | |
1139 | if((atomic_read(&sk->sk_wmem_alloc) << 1) <= sk->sk_sndbuf) { | |
1140 | if (sk->sk_sleep && waitqueue_active(sk->sk_sleep)) | |
1141 | wake_up_interruptible(sk->sk_sleep); | |
1142 | ||
1143 | /* Should agree with poll, otherwise some programs break */ | |
1144 | if (sock_writeable(sk)) | |
1145 | sk_wake_async(sk, 2, POLL_OUT); | |
1146 | } | |
1147 | ||
1148 | read_unlock(&sk->sk_callback_lock); | |
1149 | } | |
1150 | ||
1151 | static void sock_def_destruct(struct sock *sk) | |
1152 | { | |
1153 | if (sk->sk_protinfo) | |
1154 | kfree(sk->sk_protinfo); | |
1155 | } | |
1156 | ||
1157 | void sk_send_sigurg(struct sock *sk) | |
1158 | { | |
1159 | if (sk->sk_socket && sk->sk_socket->file) | |
1160 | if (send_sigurg(&sk->sk_socket->file->f_owner)) | |
1161 | sk_wake_async(sk, 3, POLL_PRI); | |
1162 | } | |
1163 | ||
1164 | void sk_reset_timer(struct sock *sk, struct timer_list* timer, | |
1165 | unsigned long expires) | |
1166 | { | |
1167 | if (!mod_timer(timer, expires)) | |
1168 | sock_hold(sk); | |
1169 | } | |
1170 | ||
1171 | EXPORT_SYMBOL(sk_reset_timer); | |
1172 | ||
1173 | void sk_stop_timer(struct sock *sk, struct timer_list* timer) | |
1174 | { | |
1175 | if (timer_pending(timer) && del_timer(timer)) | |
1176 | __sock_put(sk); | |
1177 | } | |
1178 | ||
1179 | EXPORT_SYMBOL(sk_stop_timer); | |
1180 | ||
1181 | void sock_init_data(struct socket *sock, struct sock *sk) | |
1182 | { | |
1183 | skb_queue_head_init(&sk->sk_receive_queue); | |
1184 | skb_queue_head_init(&sk->sk_write_queue); | |
1185 | skb_queue_head_init(&sk->sk_error_queue); | |
1186 | ||
1187 | sk->sk_send_head = NULL; | |
1188 | ||
1189 | init_timer(&sk->sk_timer); | |
1190 | ||
1191 | sk->sk_allocation = GFP_KERNEL; | |
1192 | sk->sk_rcvbuf = sysctl_rmem_default; | |
1193 | sk->sk_sndbuf = sysctl_wmem_default; | |
1194 | sk->sk_state = TCP_CLOSE; | |
1195 | sk->sk_socket = sock; | |
1196 | ||
1197 | sock_set_flag(sk, SOCK_ZAPPED); | |
1198 | ||
1199 | if(sock) | |
1200 | { | |
1201 | sk->sk_type = sock->type; | |
1202 | sk->sk_sleep = &sock->wait; | |
1203 | sock->sk = sk; | |
1204 | } else | |
1205 | sk->sk_sleep = NULL; | |
1206 | ||
1207 | rwlock_init(&sk->sk_dst_lock); | |
1208 | rwlock_init(&sk->sk_callback_lock); | |
1209 | ||
1210 | sk->sk_state_change = sock_def_wakeup; | |
1211 | sk->sk_data_ready = sock_def_readable; | |
1212 | sk->sk_write_space = sock_def_write_space; | |
1213 | sk->sk_error_report = sock_def_error_report; | |
1214 | sk->sk_destruct = sock_def_destruct; | |
1215 | ||
1216 | sk->sk_sndmsg_page = NULL; | |
1217 | sk->sk_sndmsg_off = 0; | |
1218 | ||
1219 | sk->sk_peercred.pid = 0; | |
1220 | sk->sk_peercred.uid = -1; | |
1221 | sk->sk_peercred.gid = -1; | |
1222 | sk->sk_write_pending = 0; | |
1223 | sk->sk_rcvlowat = 1; | |
1224 | sk->sk_rcvtimeo = MAX_SCHEDULE_TIMEOUT; | |
1225 | sk->sk_sndtimeo = MAX_SCHEDULE_TIMEOUT; | |
1226 | ||
1227 | sk->sk_stamp.tv_sec = -1L; | |
1228 | sk->sk_stamp.tv_usec = -1L; | |
1229 | ||
1230 | atomic_set(&sk->sk_refcnt, 1); | |
1231 | } | |
1232 | ||
1233 | void fastcall lock_sock(struct sock *sk) | |
1234 | { | |
1235 | might_sleep(); | |
1236 | spin_lock_bh(&(sk->sk_lock.slock)); | |
1237 | if (sk->sk_lock.owner) | |
1238 | __lock_sock(sk); | |
1239 | sk->sk_lock.owner = (void *)1; | |
1240 | spin_unlock_bh(&(sk->sk_lock.slock)); | |
1241 | } | |
1242 | ||
1243 | EXPORT_SYMBOL(lock_sock); | |
1244 | ||
1245 | void fastcall release_sock(struct sock *sk) | |
1246 | { | |
1247 | spin_lock_bh(&(sk->sk_lock.slock)); | |
1248 | if (sk->sk_backlog.tail) | |
1249 | __release_sock(sk); | |
1250 | sk->sk_lock.owner = NULL; | |
1251 | if (waitqueue_active(&(sk->sk_lock.wq))) | |
1252 | wake_up(&(sk->sk_lock.wq)); | |
1253 | spin_unlock_bh(&(sk->sk_lock.slock)); | |
1254 | } | |
1255 | EXPORT_SYMBOL(release_sock); | |
1256 | ||
1257 | int sock_get_timestamp(struct sock *sk, struct timeval __user *userstamp) | |
1258 | { | |
1259 | if (!sock_flag(sk, SOCK_TIMESTAMP)) | |
1260 | sock_enable_timestamp(sk); | |
1261 | if (sk->sk_stamp.tv_sec == -1) | |
1262 | return -ENOENT; | |
1263 | if (sk->sk_stamp.tv_sec == 0) | |
1264 | do_gettimeofday(&sk->sk_stamp); | |
1265 | return copy_to_user(userstamp, &sk->sk_stamp, sizeof(struct timeval)) ? | |
1266 | -EFAULT : 0; | |
1267 | } | |
1268 | EXPORT_SYMBOL(sock_get_timestamp); | |
1269 | ||
1270 | void sock_enable_timestamp(struct sock *sk) | |
1271 | { | |
1272 | if (!sock_flag(sk, SOCK_TIMESTAMP)) { | |
1273 | sock_set_flag(sk, SOCK_TIMESTAMP); | |
1274 | net_enable_timestamp(); | |
1275 | } | |
1276 | } | |
1277 | EXPORT_SYMBOL(sock_enable_timestamp); | |
1278 | ||
1279 | /* | |
1280 | * Get a socket option on an socket. | |
1281 | * | |
1282 | * FIX: POSIX 1003.1g is very ambiguous here. It states that | |
1283 | * asynchronous errors should be reported by getsockopt. We assume | |
1284 | * this means if you specify SO_ERROR (otherwise whats the point of it). | |
1285 | */ | |
1286 | int sock_common_getsockopt(struct socket *sock, int level, int optname, | |
1287 | char __user *optval, int __user *optlen) | |
1288 | { | |
1289 | struct sock *sk = sock->sk; | |
1290 | ||
1291 | return sk->sk_prot->getsockopt(sk, level, optname, optval, optlen); | |
1292 | } | |
1293 | ||
1294 | EXPORT_SYMBOL(sock_common_getsockopt); | |
1295 | ||
1296 | int sock_common_recvmsg(struct kiocb *iocb, struct socket *sock, | |
1297 | struct msghdr *msg, size_t size, int flags) | |
1298 | { | |
1299 | struct sock *sk = sock->sk; | |
1300 | int addr_len = 0; | |
1301 | int err; | |
1302 | ||
1303 | err = sk->sk_prot->recvmsg(iocb, sk, msg, size, flags & MSG_DONTWAIT, | |
1304 | flags & ~MSG_DONTWAIT, &addr_len); | |
1305 | if (err >= 0) | |
1306 | msg->msg_namelen = addr_len; | |
1307 | return err; | |
1308 | } | |
1309 | ||
1310 | EXPORT_SYMBOL(sock_common_recvmsg); | |
1311 | ||
1312 | /* | |
1313 | * Set socket options on an inet socket. | |
1314 | */ | |
1315 | int sock_common_setsockopt(struct socket *sock, int level, int optname, | |
1316 | char __user *optval, int optlen) | |
1317 | { | |
1318 | struct sock *sk = sock->sk; | |
1319 | ||
1320 | return sk->sk_prot->setsockopt(sk, level, optname, optval, optlen); | |
1321 | } | |
1322 | ||
1323 | EXPORT_SYMBOL(sock_common_setsockopt); | |
1324 | ||
1325 | void sk_common_release(struct sock *sk) | |
1326 | { | |
1327 | if (sk->sk_prot->destroy) | |
1328 | sk->sk_prot->destroy(sk); | |
1329 | ||
1330 | /* | |
1331 | * Observation: when sock_common_release is called, processes have | |
1332 | * no access to socket. But net still has. | |
1333 | * Step one, detach it from networking: | |
1334 | * | |
1335 | * A. Remove from hash tables. | |
1336 | */ | |
1337 | ||
1338 | sk->sk_prot->unhash(sk); | |
1339 | ||
1340 | /* | |
1341 | * In this point socket cannot receive new packets, but it is possible | |
1342 | * that some packets are in flight because some CPU runs receiver and | |
1343 | * did hash table lookup before we unhashed socket. They will achieve | |
1344 | * receive queue and will be purged by socket destructor. | |
1345 | * | |
1346 | * Also we still have packets pending on receive queue and probably, | |
1347 | * our own packets waiting in device queues. sock_destroy will drain | |
1348 | * receive queue, but transmitted packets will delay socket destruction | |
1349 | * until the last reference will be released. | |
1350 | */ | |
1351 | ||
1352 | sock_orphan(sk); | |
1353 | ||
1354 | xfrm_sk_free_policy(sk); | |
1355 | ||
1356 | #ifdef INET_REFCNT_DEBUG | |
1357 | if (atomic_read(&sk->sk_refcnt) != 1) | |
1358 | printk(KERN_DEBUG "Destruction of the socket %p delayed, c=%d\n", | |
1359 | sk, atomic_read(&sk->sk_refcnt)); | |
1360 | #endif | |
1361 | sock_put(sk); | |
1362 | } | |
1363 | ||
1364 | EXPORT_SYMBOL(sk_common_release); | |
1365 | ||
1366 | static DEFINE_RWLOCK(proto_list_lock); | |
1367 | static LIST_HEAD(proto_list); | |
1368 | ||
1369 | int proto_register(struct proto *prot, int alloc_slab) | |
1370 | { | |
2e6599cb | 1371 | char *request_sock_slab_name; |
1da177e4 LT |
1372 | int rc = -ENOBUFS; |
1373 | ||
1da177e4 LT |
1374 | if (alloc_slab) { |
1375 | prot->slab = kmem_cache_create(prot->name, prot->obj_size, 0, | |
1376 | SLAB_HWCACHE_ALIGN, NULL, NULL); | |
1377 | ||
1378 | if (prot->slab == NULL) { | |
1379 | printk(KERN_CRIT "%s: Can't create sock SLAB cache!\n", | |
1380 | prot->name); | |
2a278051 | 1381 | goto out; |
1da177e4 | 1382 | } |
2e6599cb ACM |
1383 | |
1384 | if (prot->rsk_prot != NULL) { | |
1385 | static const char mask[] = "request_sock_%s"; | |
1386 | ||
1387 | request_sock_slab_name = kmalloc(strlen(prot->name) + sizeof(mask) - 1, GFP_KERNEL); | |
1388 | if (request_sock_slab_name == NULL) | |
1389 | goto out_free_sock_slab; | |
1390 | ||
1391 | sprintf(request_sock_slab_name, mask, prot->name); | |
1392 | prot->rsk_prot->slab = kmem_cache_create(request_sock_slab_name, | |
1393 | prot->rsk_prot->obj_size, 0, | |
1394 | SLAB_HWCACHE_ALIGN, NULL, NULL); | |
1395 | ||
1396 | if (prot->rsk_prot->slab == NULL) { | |
1397 | printk(KERN_CRIT "%s: Can't create request sock SLAB cache!\n", | |
1398 | prot->name); | |
1399 | goto out_free_request_sock_slab_name; | |
1400 | } | |
1401 | } | |
1da177e4 LT |
1402 | } |
1403 | ||
2a278051 | 1404 | write_lock(&proto_list_lock); |
1da177e4 | 1405 | list_add(&prot->node, &proto_list); |
1da177e4 | 1406 | write_unlock(&proto_list_lock); |
2a278051 ACM |
1407 | rc = 0; |
1408 | out: | |
1da177e4 | 1409 | return rc; |
2e6599cb ACM |
1410 | out_free_request_sock_slab_name: |
1411 | kfree(request_sock_slab_name); | |
1412 | out_free_sock_slab: | |
1413 | kmem_cache_destroy(prot->slab); | |
1414 | prot->slab = NULL; | |
1415 | goto out; | |
1da177e4 LT |
1416 | } |
1417 | ||
1418 | EXPORT_SYMBOL(proto_register); | |
1419 | ||
1420 | void proto_unregister(struct proto *prot) | |
1421 | { | |
1422 | write_lock(&proto_list_lock); | |
1423 | ||
1424 | if (prot->slab != NULL) { | |
1425 | kmem_cache_destroy(prot->slab); | |
1426 | prot->slab = NULL; | |
1427 | } | |
1428 | ||
2e6599cb ACM |
1429 | if (prot->rsk_prot != NULL && prot->rsk_prot->slab != NULL) { |
1430 | const char *name = kmem_cache_name(prot->rsk_prot->slab); | |
1431 | ||
1432 | kmem_cache_destroy(prot->rsk_prot->slab); | |
1433 | kfree(name); | |
1434 | prot->rsk_prot->slab = NULL; | |
1435 | } | |
1436 | ||
1da177e4 LT |
1437 | list_del(&prot->node); |
1438 | write_unlock(&proto_list_lock); | |
1439 | } | |
1440 | ||
1441 | EXPORT_SYMBOL(proto_unregister); | |
1442 | ||
1443 | #ifdef CONFIG_PROC_FS | |
1444 | static inline struct proto *__proto_head(void) | |
1445 | { | |
1446 | return list_entry(proto_list.next, struct proto, node); | |
1447 | } | |
1448 | ||
1449 | static inline struct proto *proto_head(void) | |
1450 | { | |
1451 | return list_empty(&proto_list) ? NULL : __proto_head(); | |
1452 | } | |
1453 | ||
1454 | static inline struct proto *proto_next(struct proto *proto) | |
1455 | { | |
1456 | return proto->node.next == &proto_list ? NULL : | |
1457 | list_entry(proto->node.next, struct proto, node); | |
1458 | } | |
1459 | ||
1460 | static inline struct proto *proto_get_idx(loff_t pos) | |
1461 | { | |
1462 | struct proto *proto; | |
1463 | loff_t i = 0; | |
1464 | ||
1465 | list_for_each_entry(proto, &proto_list, node) | |
1466 | if (i++ == pos) | |
1467 | goto out; | |
1468 | ||
1469 | proto = NULL; | |
1470 | out: | |
1471 | return proto; | |
1472 | } | |
1473 | ||
1474 | static void *proto_seq_start(struct seq_file *seq, loff_t *pos) | |
1475 | { | |
1476 | read_lock(&proto_list_lock); | |
1477 | return *pos ? proto_get_idx(*pos - 1) : SEQ_START_TOKEN; | |
1478 | } | |
1479 | ||
1480 | static void *proto_seq_next(struct seq_file *seq, void *v, loff_t *pos) | |
1481 | { | |
1482 | ++*pos; | |
1483 | return v == SEQ_START_TOKEN ? proto_head() : proto_next(v); | |
1484 | } | |
1485 | ||
1486 | static void proto_seq_stop(struct seq_file *seq, void *v) | |
1487 | { | |
1488 | read_unlock(&proto_list_lock); | |
1489 | } | |
1490 | ||
1491 | static char proto_method_implemented(const void *method) | |
1492 | { | |
1493 | return method == NULL ? 'n' : 'y'; | |
1494 | } | |
1495 | ||
1496 | static void proto_seq_printf(struct seq_file *seq, struct proto *proto) | |
1497 | { | |
1498 | seq_printf(seq, "%-9s %4u %6d %6d %-3s %6u %-3s %-10s " | |
1499 | "%2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c\n", | |
1500 | proto->name, | |
1501 | proto->obj_size, | |
1502 | proto->sockets_allocated != NULL ? atomic_read(proto->sockets_allocated) : -1, | |
1503 | proto->memory_allocated != NULL ? atomic_read(proto->memory_allocated) : -1, | |
1504 | proto->memory_pressure != NULL ? *proto->memory_pressure ? "yes" : "no" : "NI", | |
1505 | proto->max_header, | |
1506 | proto->slab == NULL ? "no" : "yes", | |
1507 | module_name(proto->owner), | |
1508 | proto_method_implemented(proto->close), | |
1509 | proto_method_implemented(proto->connect), | |
1510 | proto_method_implemented(proto->disconnect), | |
1511 | proto_method_implemented(proto->accept), | |
1512 | proto_method_implemented(proto->ioctl), | |
1513 | proto_method_implemented(proto->init), | |
1514 | proto_method_implemented(proto->destroy), | |
1515 | proto_method_implemented(proto->shutdown), | |
1516 | proto_method_implemented(proto->setsockopt), | |
1517 | proto_method_implemented(proto->getsockopt), | |
1518 | proto_method_implemented(proto->sendmsg), | |
1519 | proto_method_implemented(proto->recvmsg), | |
1520 | proto_method_implemented(proto->sendpage), | |
1521 | proto_method_implemented(proto->bind), | |
1522 | proto_method_implemented(proto->backlog_rcv), | |
1523 | proto_method_implemented(proto->hash), | |
1524 | proto_method_implemented(proto->unhash), | |
1525 | proto_method_implemented(proto->get_port), | |
1526 | proto_method_implemented(proto->enter_memory_pressure)); | |
1527 | } | |
1528 | ||
1529 | static int proto_seq_show(struct seq_file *seq, void *v) | |
1530 | { | |
1531 | if (v == SEQ_START_TOKEN) | |
1532 | seq_printf(seq, "%-9s %-4s %-8s %-6s %-5s %-7s %-4s %-10s %s", | |
1533 | "protocol", | |
1534 | "size", | |
1535 | "sockets", | |
1536 | "memory", | |
1537 | "press", | |
1538 | "maxhdr", | |
1539 | "slab", | |
1540 | "module", | |
1541 | "cl co di ac io in de sh ss gs se re sp bi br ha uh gp em\n"); | |
1542 | else | |
1543 | proto_seq_printf(seq, v); | |
1544 | return 0; | |
1545 | } | |
1546 | ||
1547 | static struct seq_operations proto_seq_ops = { | |
1548 | .start = proto_seq_start, | |
1549 | .next = proto_seq_next, | |
1550 | .stop = proto_seq_stop, | |
1551 | .show = proto_seq_show, | |
1552 | }; | |
1553 | ||
1554 | static int proto_seq_open(struct inode *inode, struct file *file) | |
1555 | { | |
1556 | return seq_open(file, &proto_seq_ops); | |
1557 | } | |
1558 | ||
1559 | static struct file_operations proto_seq_fops = { | |
1560 | .owner = THIS_MODULE, | |
1561 | .open = proto_seq_open, | |
1562 | .read = seq_read, | |
1563 | .llseek = seq_lseek, | |
1564 | .release = seq_release, | |
1565 | }; | |
1566 | ||
1567 | static int __init proto_init(void) | |
1568 | { | |
1569 | /* register /proc/net/protocols */ | |
1570 | return proc_net_fops_create("protocols", S_IRUGO, &proto_seq_fops) == NULL ? -ENOBUFS : 0; | |
1571 | } | |
1572 | ||
1573 | subsys_initcall(proto_init); | |
1574 | ||
1575 | #endif /* PROC_FS */ | |
1576 | ||
1577 | EXPORT_SYMBOL(sk_alloc); | |
1578 | EXPORT_SYMBOL(sk_free); | |
1579 | EXPORT_SYMBOL(sk_send_sigurg); | |
1580 | EXPORT_SYMBOL(sock_alloc_send_skb); | |
1581 | EXPORT_SYMBOL(sock_init_data); | |
1582 | EXPORT_SYMBOL(sock_kfree_s); | |
1583 | EXPORT_SYMBOL(sock_kmalloc); | |
1584 | EXPORT_SYMBOL(sock_no_accept); | |
1585 | EXPORT_SYMBOL(sock_no_bind); | |
1586 | EXPORT_SYMBOL(sock_no_connect); | |
1587 | EXPORT_SYMBOL(sock_no_getname); | |
1588 | EXPORT_SYMBOL(sock_no_getsockopt); | |
1589 | EXPORT_SYMBOL(sock_no_ioctl); | |
1590 | EXPORT_SYMBOL(sock_no_listen); | |
1591 | EXPORT_SYMBOL(sock_no_mmap); | |
1592 | EXPORT_SYMBOL(sock_no_poll); | |
1593 | EXPORT_SYMBOL(sock_no_recvmsg); | |
1594 | EXPORT_SYMBOL(sock_no_sendmsg); | |
1595 | EXPORT_SYMBOL(sock_no_sendpage); | |
1596 | EXPORT_SYMBOL(sock_no_setsockopt); | |
1597 | EXPORT_SYMBOL(sock_no_shutdown); | |
1598 | EXPORT_SYMBOL(sock_no_socketpair); | |
1599 | EXPORT_SYMBOL(sock_rfree); | |
1600 | EXPORT_SYMBOL(sock_setsockopt); | |
1601 | EXPORT_SYMBOL(sock_wfree); | |
1602 | EXPORT_SYMBOL(sock_wmalloc); | |
1603 | EXPORT_SYMBOL(sock_i_uid); | |
1604 | EXPORT_SYMBOL(sock_i_ino); | |
1605 | #ifdef CONFIG_SYSCTL | |
1606 | EXPORT_SYMBOL(sysctl_optmem_max); | |
1607 | EXPORT_SYMBOL(sysctl_rmem_max); | |
1608 | EXPORT_SYMBOL(sysctl_wmem_max); | |
1609 | #endif |