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 | * | |
12 | * Authors: Ross Biro, <bir7@leland.Stanford.Edu> | |
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> | |
121 | #include <net/sock.h> | |
122 | #include <net/xfrm.h> | |
123 | #include <linux/ipsec.h> | |
124 | ||
125 | #include <linux/filter.h> | |
126 | ||
127 | #ifdef CONFIG_INET | |
128 | #include <net/tcp.h> | |
129 | #endif | |
130 | ||
131 | /* Take into consideration the size of the struct sk_buff overhead in the | |
132 | * determination of these values, since that is non-constant across | |
133 | * platforms. This makes socket queueing behavior and performance | |
134 | * not depend upon such differences. | |
135 | */ | |
136 | #define _SK_MEM_PACKETS 256 | |
137 | #define _SK_MEM_OVERHEAD (sizeof(struct sk_buff) + 256) | |
138 | #define SK_WMEM_MAX (_SK_MEM_OVERHEAD * _SK_MEM_PACKETS) | |
139 | #define SK_RMEM_MAX (_SK_MEM_OVERHEAD * _SK_MEM_PACKETS) | |
140 | ||
141 | /* Run time adjustable parameters. */ | |
142 | __u32 sysctl_wmem_max = SK_WMEM_MAX; | |
143 | __u32 sysctl_rmem_max = SK_RMEM_MAX; | |
144 | __u32 sysctl_wmem_default = SK_WMEM_MAX; | |
145 | __u32 sysctl_rmem_default = SK_RMEM_MAX; | |
146 | ||
147 | /* Maximal space eaten by iovec or ancilliary data plus some space */ | |
148 | int sysctl_optmem_max = sizeof(unsigned long)*(2*UIO_MAXIOV + 512); | |
149 | ||
150 | static int sock_set_timeout(long *timeo_p, char __user *optval, int optlen) | |
151 | { | |
152 | struct timeval tv; | |
153 | ||
154 | if (optlen < sizeof(tv)) | |
155 | return -EINVAL; | |
156 | if (copy_from_user(&tv, optval, sizeof(tv))) | |
157 | return -EFAULT; | |
158 | ||
159 | *timeo_p = MAX_SCHEDULE_TIMEOUT; | |
160 | if (tv.tv_sec == 0 && tv.tv_usec == 0) | |
161 | return 0; | |
162 | if (tv.tv_sec < (MAX_SCHEDULE_TIMEOUT/HZ - 1)) | |
163 | *timeo_p = tv.tv_sec*HZ + (tv.tv_usec+(1000000/HZ-1))/(1000000/HZ); | |
164 | return 0; | |
165 | } | |
166 | ||
167 | static void sock_warn_obsolete_bsdism(const char *name) | |
168 | { | |
169 | static int warned; | |
170 | static char warncomm[TASK_COMM_LEN]; | |
171 | if (strcmp(warncomm, current->comm) && warned < 5) { | |
172 | strcpy(warncomm, current->comm); | |
173 | printk(KERN_WARNING "process `%s' is using obsolete " | |
174 | "%s SO_BSDCOMPAT\n", warncomm, name); | |
175 | warned++; | |
176 | } | |
177 | } | |
178 | ||
179 | static void sock_disable_timestamp(struct sock *sk) | |
180 | { | |
181 | if (sock_flag(sk, SOCK_TIMESTAMP)) { | |
182 | sock_reset_flag(sk, SOCK_TIMESTAMP); | |
183 | net_disable_timestamp(); | |
184 | } | |
185 | } | |
186 | ||
187 | ||
188 | /* | |
189 | * This is meant for all protocols to use and covers goings on | |
190 | * at the socket level. Everything here is generic. | |
191 | */ | |
192 | ||
193 | int sock_setsockopt(struct socket *sock, int level, int optname, | |
194 | char __user *optval, int optlen) | |
195 | { | |
196 | struct sock *sk=sock->sk; | |
197 | struct sk_filter *filter; | |
198 | int val; | |
199 | int valbool; | |
200 | struct linger ling; | |
201 | int ret = 0; | |
202 | ||
203 | /* | |
204 | * Options without arguments | |
205 | */ | |
206 | ||
207 | #ifdef SO_DONTLINGER /* Compatibility item... */ | |
208 | switch (optname) { | |
209 | case SO_DONTLINGER: | |
210 | sock_reset_flag(sk, SOCK_LINGER); | |
211 | return 0; | |
212 | } | |
213 | #endif | |
214 | ||
215 | if(optlen<sizeof(int)) | |
216 | return(-EINVAL); | |
217 | ||
218 | if (get_user(val, (int __user *)optval)) | |
219 | return -EFAULT; | |
220 | ||
221 | valbool = val?1:0; | |
222 | ||
223 | lock_sock(sk); | |
224 | ||
225 | switch(optname) | |
226 | { | |
227 | case SO_DEBUG: | |
228 | if(val && !capable(CAP_NET_ADMIN)) | |
229 | { | |
230 | ret = -EACCES; | |
231 | } | |
232 | else if (valbool) | |
233 | sock_set_flag(sk, SOCK_DBG); | |
234 | else | |
235 | sock_reset_flag(sk, SOCK_DBG); | |
236 | break; | |
237 | case SO_REUSEADDR: | |
238 | sk->sk_reuse = valbool; | |
239 | break; | |
240 | case SO_TYPE: | |
241 | case SO_ERROR: | |
242 | ret = -ENOPROTOOPT; | |
243 | break; | |
244 | case SO_DONTROUTE: | |
245 | if (valbool) | |
246 | sock_set_flag(sk, SOCK_LOCALROUTE); | |
247 | else | |
248 | sock_reset_flag(sk, SOCK_LOCALROUTE); | |
249 | break; | |
250 | case SO_BROADCAST: | |
251 | sock_valbool_flag(sk, SOCK_BROADCAST, valbool); | |
252 | break; | |
253 | case SO_SNDBUF: | |
254 | /* Don't error on this BSD doesn't and if you think | |
255 | about it this is right. Otherwise apps have to | |
256 | play 'guess the biggest size' games. RCVBUF/SNDBUF | |
257 | are treated in BSD as hints */ | |
258 | ||
259 | if (val > sysctl_wmem_max) | |
260 | val = sysctl_wmem_max; | |
261 | ||
262 | sk->sk_userlocks |= SOCK_SNDBUF_LOCK; | |
263 | if ((val * 2) < SOCK_MIN_SNDBUF) | |
264 | sk->sk_sndbuf = SOCK_MIN_SNDBUF; | |
265 | else | |
266 | sk->sk_sndbuf = val * 2; | |
267 | ||
268 | /* | |
269 | * Wake up sending tasks if we | |
270 | * upped the value. | |
271 | */ | |
272 | sk->sk_write_space(sk); | |
273 | break; | |
274 | ||
275 | case SO_RCVBUF: | |
276 | /* Don't error on this BSD doesn't and if you think | |
277 | about it this is right. Otherwise apps have to | |
278 | play 'guess the biggest size' games. RCVBUF/SNDBUF | |
279 | are treated in BSD as hints */ | |
280 | ||
281 | if (val > sysctl_rmem_max) | |
282 | val = sysctl_rmem_max; | |
283 | ||
284 | sk->sk_userlocks |= SOCK_RCVBUF_LOCK; | |
285 | /* FIXME: is this lower bound the right one? */ | |
286 | if ((val * 2) < SOCK_MIN_RCVBUF) | |
287 | sk->sk_rcvbuf = SOCK_MIN_RCVBUF; | |
288 | else | |
289 | sk->sk_rcvbuf = val * 2; | |
290 | break; | |
291 | ||
292 | case SO_KEEPALIVE: | |
293 | #ifdef CONFIG_INET | |
294 | if (sk->sk_protocol == IPPROTO_TCP) | |
295 | tcp_set_keepalive(sk, valbool); | |
296 | #endif | |
297 | sock_valbool_flag(sk, SOCK_KEEPOPEN, valbool); | |
298 | break; | |
299 | ||
300 | case SO_OOBINLINE: | |
301 | sock_valbool_flag(sk, SOCK_URGINLINE, valbool); | |
302 | break; | |
303 | ||
304 | case SO_NO_CHECK: | |
305 | sk->sk_no_check = valbool; | |
306 | break; | |
307 | ||
308 | case SO_PRIORITY: | |
309 | if ((val >= 0 && val <= 6) || capable(CAP_NET_ADMIN)) | |
310 | sk->sk_priority = val; | |
311 | else | |
312 | ret = -EPERM; | |
313 | break; | |
314 | ||
315 | case SO_LINGER: | |
316 | if(optlen<sizeof(ling)) { | |
317 | ret = -EINVAL; /* 1003.1g */ | |
318 | break; | |
319 | } | |
320 | if (copy_from_user(&ling,optval,sizeof(ling))) { | |
321 | ret = -EFAULT; | |
322 | break; | |
323 | } | |
324 | if (!ling.l_onoff) | |
325 | sock_reset_flag(sk, SOCK_LINGER); | |
326 | else { | |
327 | #if (BITS_PER_LONG == 32) | |
328 | if (ling.l_linger >= MAX_SCHEDULE_TIMEOUT/HZ) | |
329 | sk->sk_lingertime = MAX_SCHEDULE_TIMEOUT; | |
330 | else | |
331 | #endif | |
332 | sk->sk_lingertime = ling.l_linger * HZ; | |
333 | sock_set_flag(sk, SOCK_LINGER); | |
334 | } | |
335 | break; | |
336 | ||
337 | case SO_BSDCOMPAT: | |
338 | sock_warn_obsolete_bsdism("setsockopt"); | |
339 | break; | |
340 | ||
341 | case SO_PASSCRED: | |
342 | if (valbool) | |
343 | set_bit(SOCK_PASSCRED, &sock->flags); | |
344 | else | |
345 | clear_bit(SOCK_PASSCRED, &sock->flags); | |
346 | break; | |
347 | ||
348 | case SO_TIMESTAMP: | |
349 | if (valbool) { | |
350 | sock_set_flag(sk, SOCK_RCVTSTAMP); | |
351 | sock_enable_timestamp(sk); | |
352 | } else | |
353 | sock_reset_flag(sk, SOCK_RCVTSTAMP); | |
354 | break; | |
355 | ||
356 | case SO_RCVLOWAT: | |
357 | if (val < 0) | |
358 | val = INT_MAX; | |
359 | sk->sk_rcvlowat = val ? : 1; | |
360 | break; | |
361 | ||
362 | case SO_RCVTIMEO: | |
363 | ret = sock_set_timeout(&sk->sk_rcvtimeo, optval, optlen); | |
364 | break; | |
365 | ||
366 | case SO_SNDTIMEO: | |
367 | ret = sock_set_timeout(&sk->sk_sndtimeo, optval, optlen); | |
368 | break; | |
369 | ||
370 | #ifdef CONFIG_NETDEVICES | |
371 | case SO_BINDTODEVICE: | |
372 | { | |
373 | char devname[IFNAMSIZ]; | |
374 | ||
375 | /* Sorry... */ | |
376 | if (!capable(CAP_NET_RAW)) { | |
377 | ret = -EPERM; | |
378 | break; | |
379 | } | |
380 | ||
381 | /* Bind this socket to a particular device like "eth0", | |
382 | * as specified in the passed interface name. If the | |
383 | * name is "" or the option length is zero the socket | |
384 | * is not bound. | |
385 | */ | |
386 | ||
387 | if (!valbool) { | |
388 | sk->sk_bound_dev_if = 0; | |
389 | } else { | |
390 | if (optlen > IFNAMSIZ) | |
391 | optlen = IFNAMSIZ; | |
392 | if (copy_from_user(devname, optval, optlen)) { | |
393 | ret = -EFAULT; | |
394 | break; | |
395 | } | |
396 | ||
397 | /* Remove any cached route for this socket. */ | |
398 | sk_dst_reset(sk); | |
399 | ||
400 | if (devname[0] == '\0') { | |
401 | sk->sk_bound_dev_if = 0; | |
402 | } else { | |
403 | struct net_device *dev = dev_get_by_name(devname); | |
404 | if (!dev) { | |
405 | ret = -ENODEV; | |
406 | break; | |
407 | } | |
408 | sk->sk_bound_dev_if = dev->ifindex; | |
409 | dev_put(dev); | |
410 | } | |
411 | } | |
412 | break; | |
413 | } | |
414 | #endif | |
415 | ||
416 | ||
417 | case SO_ATTACH_FILTER: | |
418 | ret = -EINVAL; | |
419 | if (optlen == sizeof(struct sock_fprog)) { | |
420 | struct sock_fprog fprog; | |
421 | ||
422 | ret = -EFAULT; | |
423 | if (copy_from_user(&fprog, optval, sizeof(fprog))) | |
424 | break; | |
425 | ||
426 | ret = sk_attach_filter(&fprog, sk); | |
427 | } | |
428 | break; | |
429 | ||
430 | case SO_DETACH_FILTER: | |
431 | spin_lock_bh(&sk->sk_lock.slock); | |
432 | filter = sk->sk_filter; | |
433 | if (filter) { | |
434 | sk->sk_filter = NULL; | |
435 | spin_unlock_bh(&sk->sk_lock.slock); | |
436 | sk_filter_release(sk, filter); | |
437 | break; | |
438 | } | |
439 | spin_unlock_bh(&sk->sk_lock.slock); | |
440 | ret = -ENONET; | |
441 | break; | |
442 | ||
443 | /* We implement the SO_SNDLOWAT etc to | |
444 | not be settable (1003.1g 5.3) */ | |
445 | default: | |
446 | ret = -ENOPROTOOPT; | |
447 | break; | |
448 | } | |
449 | release_sock(sk); | |
450 | return ret; | |
451 | } | |
452 | ||
453 | ||
454 | int sock_getsockopt(struct socket *sock, int level, int optname, | |
455 | char __user *optval, int __user *optlen) | |
456 | { | |
457 | struct sock *sk = sock->sk; | |
458 | ||
459 | union | |
460 | { | |
461 | int val; | |
462 | struct linger ling; | |
463 | struct timeval tm; | |
464 | } v; | |
465 | ||
466 | unsigned int lv = sizeof(int); | |
467 | int len; | |
468 | ||
469 | if(get_user(len,optlen)) | |
470 | return -EFAULT; | |
471 | if(len < 0) | |
472 | return -EINVAL; | |
473 | ||
474 | switch(optname) | |
475 | { | |
476 | case SO_DEBUG: | |
477 | v.val = sock_flag(sk, SOCK_DBG); | |
478 | break; | |
479 | ||
480 | case SO_DONTROUTE: | |
481 | v.val = sock_flag(sk, SOCK_LOCALROUTE); | |
482 | break; | |
483 | ||
484 | case SO_BROADCAST: | |
485 | v.val = !!sock_flag(sk, SOCK_BROADCAST); | |
486 | break; | |
487 | ||
488 | case SO_SNDBUF: | |
489 | v.val = sk->sk_sndbuf; | |
490 | break; | |
491 | ||
492 | case SO_RCVBUF: | |
493 | v.val = sk->sk_rcvbuf; | |
494 | break; | |
495 | ||
496 | case SO_REUSEADDR: | |
497 | v.val = sk->sk_reuse; | |
498 | break; | |
499 | ||
500 | case SO_KEEPALIVE: | |
501 | v.val = !!sock_flag(sk, SOCK_KEEPOPEN); | |
502 | break; | |
503 | ||
504 | case SO_TYPE: | |
505 | v.val = sk->sk_type; | |
506 | break; | |
507 | ||
508 | case SO_ERROR: | |
509 | v.val = -sock_error(sk); | |
510 | if(v.val==0) | |
511 | v.val = xchg(&sk->sk_err_soft, 0); | |
512 | break; | |
513 | ||
514 | case SO_OOBINLINE: | |
515 | v.val = !!sock_flag(sk, SOCK_URGINLINE); | |
516 | break; | |
517 | ||
518 | case SO_NO_CHECK: | |
519 | v.val = sk->sk_no_check; | |
520 | break; | |
521 | ||
522 | case SO_PRIORITY: | |
523 | v.val = sk->sk_priority; | |
524 | break; | |
525 | ||
526 | case SO_LINGER: | |
527 | lv = sizeof(v.ling); | |
528 | v.ling.l_onoff = !!sock_flag(sk, SOCK_LINGER); | |
529 | v.ling.l_linger = sk->sk_lingertime / HZ; | |
530 | break; | |
531 | ||
532 | case SO_BSDCOMPAT: | |
533 | sock_warn_obsolete_bsdism("getsockopt"); | |
534 | break; | |
535 | ||
536 | case SO_TIMESTAMP: | |
537 | v.val = sock_flag(sk, SOCK_RCVTSTAMP); | |
538 | break; | |
539 | ||
540 | case SO_RCVTIMEO: | |
541 | lv=sizeof(struct timeval); | |
542 | if (sk->sk_rcvtimeo == MAX_SCHEDULE_TIMEOUT) { | |
543 | v.tm.tv_sec = 0; | |
544 | v.tm.tv_usec = 0; | |
545 | } else { | |
546 | v.tm.tv_sec = sk->sk_rcvtimeo / HZ; | |
547 | v.tm.tv_usec = ((sk->sk_rcvtimeo % HZ) * 1000000) / HZ; | |
548 | } | |
549 | break; | |
550 | ||
551 | case SO_SNDTIMEO: | |
552 | lv=sizeof(struct timeval); | |
553 | if (sk->sk_sndtimeo == MAX_SCHEDULE_TIMEOUT) { | |
554 | v.tm.tv_sec = 0; | |
555 | v.tm.tv_usec = 0; | |
556 | } else { | |
557 | v.tm.tv_sec = sk->sk_sndtimeo / HZ; | |
558 | v.tm.tv_usec = ((sk->sk_sndtimeo % HZ) * 1000000) / HZ; | |
559 | } | |
560 | break; | |
561 | ||
562 | case SO_RCVLOWAT: | |
563 | v.val = sk->sk_rcvlowat; | |
564 | break; | |
565 | ||
566 | case SO_SNDLOWAT: | |
567 | v.val=1; | |
568 | break; | |
569 | ||
570 | case SO_PASSCRED: | |
571 | v.val = test_bit(SOCK_PASSCRED, &sock->flags) ? 1 : 0; | |
572 | break; | |
573 | ||
574 | case SO_PEERCRED: | |
575 | if (len > sizeof(sk->sk_peercred)) | |
576 | len = sizeof(sk->sk_peercred); | |
577 | if (copy_to_user(optval, &sk->sk_peercred, len)) | |
578 | return -EFAULT; | |
579 | goto lenout; | |
580 | ||
581 | case SO_PEERNAME: | |
582 | { | |
583 | char address[128]; | |
584 | ||
585 | if (sock->ops->getname(sock, (struct sockaddr *)address, &lv, 2)) | |
586 | return -ENOTCONN; | |
587 | if (lv < len) | |
588 | return -EINVAL; | |
589 | if (copy_to_user(optval, address, len)) | |
590 | return -EFAULT; | |
591 | goto lenout; | |
592 | } | |
593 | ||
594 | /* Dubious BSD thing... Probably nobody even uses it, but | |
595 | * the UNIX standard wants it for whatever reason... -DaveM | |
596 | */ | |
597 | case SO_ACCEPTCONN: | |
598 | v.val = sk->sk_state == TCP_LISTEN; | |
599 | break; | |
600 | ||
601 | case SO_PEERSEC: | |
602 | return security_socket_getpeersec(sock, optval, optlen, len); | |
603 | ||
604 | default: | |
605 | return(-ENOPROTOOPT); | |
606 | } | |
607 | if (len > lv) | |
608 | len = lv; | |
609 | if (copy_to_user(optval, &v, len)) | |
610 | return -EFAULT; | |
611 | lenout: | |
612 | if (put_user(len, optlen)) | |
613 | return -EFAULT; | |
614 | return 0; | |
615 | } | |
616 | ||
617 | /** | |
618 | * sk_alloc - All socket objects are allocated here | |
4dc3b16b PP |
619 | * @family: protocol family |
620 | * @priority: for allocation (%GFP_KERNEL, %GFP_ATOMIC, etc) | |
621 | * @prot: struct proto associated with this new sock instance | |
622 | * @zero_it: if we should zero the newly allocated sock | |
1da177e4 LT |
623 | */ |
624 | struct sock *sk_alloc(int family, int priority, struct proto *prot, int zero_it) | |
625 | { | |
626 | struct sock *sk = NULL; | |
627 | kmem_cache_t *slab = prot->slab; | |
628 | ||
629 | if (slab != NULL) | |
630 | sk = kmem_cache_alloc(slab, priority); | |
631 | else | |
632 | sk = kmalloc(prot->obj_size, priority); | |
633 | ||
634 | if (sk) { | |
635 | if (zero_it) { | |
636 | memset(sk, 0, prot->obj_size); | |
637 | sk->sk_family = family; | |
476e19cf ACM |
638 | /* |
639 | * See comment in struct sock definition to understand | |
640 | * why we need sk_prot_creator -acme | |
641 | */ | |
642 | sk->sk_prot = sk->sk_prot_creator = prot; | |
1da177e4 LT |
643 | sock_lock_init(sk); |
644 | } | |
645 | ||
646 | if (security_sk_alloc(sk, family, priority)) { | |
88a66858 ACM |
647 | if (slab != NULL) |
648 | kmem_cache_free(slab, sk); | |
649 | else | |
650 | kfree(sk); | |
1da177e4 LT |
651 | sk = NULL; |
652 | } else | |
653 | __module_get(prot->owner); | |
654 | } | |
655 | return sk; | |
656 | } | |
657 | ||
658 | void sk_free(struct sock *sk) | |
659 | { | |
660 | struct sk_filter *filter; | |
476e19cf | 661 | struct module *owner = sk->sk_prot_creator->owner; |
1da177e4 LT |
662 | |
663 | if (sk->sk_destruct) | |
664 | sk->sk_destruct(sk); | |
665 | ||
666 | filter = sk->sk_filter; | |
667 | if (filter) { | |
668 | sk_filter_release(sk, filter); | |
669 | sk->sk_filter = NULL; | |
670 | } | |
671 | ||
672 | sock_disable_timestamp(sk); | |
673 | ||
674 | if (atomic_read(&sk->sk_omem_alloc)) | |
675 | printk(KERN_DEBUG "%s: optmem leakage (%d bytes) detected.\n", | |
676 | __FUNCTION__, atomic_read(&sk->sk_omem_alloc)); | |
677 | ||
678 | security_sk_free(sk); | |
476e19cf ACM |
679 | if (sk->sk_prot_creator->slab != NULL) |
680 | kmem_cache_free(sk->sk_prot_creator->slab, sk); | |
1da177e4 LT |
681 | else |
682 | kfree(sk); | |
683 | module_put(owner); | |
684 | } | |
685 | ||
686 | void __init sk_init(void) | |
687 | { | |
688 | if (num_physpages <= 4096) { | |
689 | sysctl_wmem_max = 32767; | |
690 | sysctl_rmem_max = 32767; | |
691 | sysctl_wmem_default = 32767; | |
692 | sysctl_rmem_default = 32767; | |
693 | } else if (num_physpages >= 131072) { | |
694 | sysctl_wmem_max = 131071; | |
695 | sysctl_rmem_max = 131071; | |
696 | } | |
697 | } | |
698 | ||
699 | /* | |
700 | * Simple resource managers for sockets. | |
701 | */ | |
702 | ||
703 | ||
704 | /* | |
705 | * Write buffer destructor automatically called from kfree_skb. | |
706 | */ | |
707 | void sock_wfree(struct sk_buff *skb) | |
708 | { | |
709 | struct sock *sk = skb->sk; | |
710 | ||
711 | /* In case it might be waiting for more memory. */ | |
712 | atomic_sub(skb->truesize, &sk->sk_wmem_alloc); | |
713 | if (!sock_flag(sk, SOCK_USE_WRITE_QUEUE)) | |
714 | sk->sk_write_space(sk); | |
715 | sock_put(sk); | |
716 | } | |
717 | ||
718 | /* | |
719 | * Read buffer destructor automatically called from kfree_skb. | |
720 | */ | |
721 | void sock_rfree(struct sk_buff *skb) | |
722 | { | |
723 | struct sock *sk = skb->sk; | |
724 | ||
725 | atomic_sub(skb->truesize, &sk->sk_rmem_alloc); | |
726 | } | |
727 | ||
728 | ||
729 | int sock_i_uid(struct sock *sk) | |
730 | { | |
731 | int uid; | |
732 | ||
733 | read_lock(&sk->sk_callback_lock); | |
734 | uid = sk->sk_socket ? SOCK_INODE(sk->sk_socket)->i_uid : 0; | |
735 | read_unlock(&sk->sk_callback_lock); | |
736 | return uid; | |
737 | } | |
738 | ||
739 | unsigned long sock_i_ino(struct sock *sk) | |
740 | { | |
741 | unsigned long ino; | |
742 | ||
743 | read_lock(&sk->sk_callback_lock); | |
744 | ino = sk->sk_socket ? SOCK_INODE(sk->sk_socket)->i_ino : 0; | |
745 | read_unlock(&sk->sk_callback_lock); | |
746 | return ino; | |
747 | } | |
748 | ||
749 | /* | |
750 | * Allocate a skb from the socket's send buffer. | |
751 | */ | |
752 | struct sk_buff *sock_wmalloc(struct sock *sk, unsigned long size, int force, int priority) | |
753 | { | |
754 | if (force || atomic_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf) { | |
755 | struct sk_buff * skb = alloc_skb(size, priority); | |
756 | if (skb) { | |
757 | skb_set_owner_w(skb, sk); | |
758 | return skb; | |
759 | } | |
760 | } | |
761 | return NULL; | |
762 | } | |
763 | ||
764 | /* | |
765 | * Allocate a skb from the socket's receive buffer. | |
766 | */ | |
767 | struct sk_buff *sock_rmalloc(struct sock *sk, unsigned long size, int force, int priority) | |
768 | { | |
769 | if (force || atomic_read(&sk->sk_rmem_alloc) < sk->sk_rcvbuf) { | |
770 | struct sk_buff *skb = alloc_skb(size, priority); | |
771 | if (skb) { | |
772 | skb_set_owner_r(skb, sk); | |
773 | return skb; | |
774 | } | |
775 | } | |
776 | return NULL; | |
777 | } | |
778 | ||
779 | /* | |
780 | * Allocate a memory block from the socket's option memory buffer. | |
781 | */ | |
782 | void *sock_kmalloc(struct sock *sk, int size, int priority) | |
783 | { | |
784 | if ((unsigned)size <= sysctl_optmem_max && | |
785 | atomic_read(&sk->sk_omem_alloc) + size < sysctl_optmem_max) { | |
786 | void *mem; | |
787 | /* First do the add, to avoid the race if kmalloc | |
788 | * might sleep. | |
789 | */ | |
790 | atomic_add(size, &sk->sk_omem_alloc); | |
791 | mem = kmalloc(size, priority); | |
792 | if (mem) | |
793 | return mem; | |
794 | atomic_sub(size, &sk->sk_omem_alloc); | |
795 | } | |
796 | return NULL; | |
797 | } | |
798 | ||
799 | /* | |
800 | * Free an option memory block. | |
801 | */ | |
802 | void sock_kfree_s(struct sock *sk, void *mem, int size) | |
803 | { | |
804 | kfree(mem); | |
805 | atomic_sub(size, &sk->sk_omem_alloc); | |
806 | } | |
807 | ||
808 | /* It is almost wait_for_tcp_memory minus release_sock/lock_sock. | |
809 | I think, these locks should be removed for datagram sockets. | |
810 | */ | |
811 | static long sock_wait_for_wmem(struct sock * sk, long timeo) | |
812 | { | |
813 | DEFINE_WAIT(wait); | |
814 | ||
815 | clear_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags); | |
816 | for (;;) { | |
817 | if (!timeo) | |
818 | break; | |
819 | if (signal_pending(current)) | |
820 | break; | |
821 | set_bit(SOCK_NOSPACE, &sk->sk_socket->flags); | |
822 | prepare_to_wait(sk->sk_sleep, &wait, TASK_INTERRUPTIBLE); | |
823 | if (atomic_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf) | |
824 | break; | |
825 | if (sk->sk_shutdown & SEND_SHUTDOWN) | |
826 | break; | |
827 | if (sk->sk_err) | |
828 | break; | |
829 | timeo = schedule_timeout(timeo); | |
830 | } | |
831 | finish_wait(sk->sk_sleep, &wait); | |
832 | return timeo; | |
833 | } | |
834 | ||
835 | ||
836 | /* | |
837 | * Generic send/receive buffer handlers | |
838 | */ | |
839 | ||
840 | static struct sk_buff *sock_alloc_send_pskb(struct sock *sk, | |
841 | unsigned long header_len, | |
842 | unsigned long data_len, | |
843 | int noblock, int *errcode) | |
844 | { | |
845 | struct sk_buff *skb; | |
846 | unsigned int gfp_mask; | |
847 | long timeo; | |
848 | int err; | |
849 | ||
850 | gfp_mask = sk->sk_allocation; | |
851 | if (gfp_mask & __GFP_WAIT) | |
852 | gfp_mask |= __GFP_REPEAT; | |
853 | ||
854 | timeo = sock_sndtimeo(sk, noblock); | |
855 | while (1) { | |
856 | err = sock_error(sk); | |
857 | if (err != 0) | |
858 | goto failure; | |
859 | ||
860 | err = -EPIPE; | |
861 | if (sk->sk_shutdown & SEND_SHUTDOWN) | |
862 | goto failure; | |
863 | ||
864 | if (atomic_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf) { | |
865 | skb = alloc_skb(header_len, sk->sk_allocation); | |
866 | if (skb) { | |
867 | int npages; | |
868 | int i; | |
869 | ||
870 | /* No pages, we're done... */ | |
871 | if (!data_len) | |
872 | break; | |
873 | ||
874 | npages = (data_len + (PAGE_SIZE - 1)) >> PAGE_SHIFT; | |
875 | skb->truesize += data_len; | |
876 | skb_shinfo(skb)->nr_frags = npages; | |
877 | for (i = 0; i < npages; i++) { | |
878 | struct page *page; | |
879 | skb_frag_t *frag; | |
880 | ||
881 | page = alloc_pages(sk->sk_allocation, 0); | |
882 | if (!page) { | |
883 | err = -ENOBUFS; | |
884 | skb_shinfo(skb)->nr_frags = i; | |
885 | kfree_skb(skb); | |
886 | goto failure; | |
887 | } | |
888 | ||
889 | frag = &skb_shinfo(skb)->frags[i]; | |
890 | frag->page = page; | |
891 | frag->page_offset = 0; | |
892 | frag->size = (data_len >= PAGE_SIZE ? | |
893 | PAGE_SIZE : | |
894 | data_len); | |
895 | data_len -= PAGE_SIZE; | |
896 | } | |
897 | ||
898 | /* Full success... */ | |
899 | break; | |
900 | } | |
901 | err = -ENOBUFS; | |
902 | goto failure; | |
903 | } | |
904 | set_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags); | |
905 | set_bit(SOCK_NOSPACE, &sk->sk_socket->flags); | |
906 | err = -EAGAIN; | |
907 | if (!timeo) | |
908 | goto failure; | |
909 | if (signal_pending(current)) | |
910 | goto interrupted; | |
911 | timeo = sock_wait_for_wmem(sk, timeo); | |
912 | } | |
913 | ||
914 | skb_set_owner_w(skb, sk); | |
915 | return skb; | |
916 | ||
917 | interrupted: | |
918 | err = sock_intr_errno(timeo); | |
919 | failure: | |
920 | *errcode = err; | |
921 | return NULL; | |
922 | } | |
923 | ||
924 | struct sk_buff *sock_alloc_send_skb(struct sock *sk, unsigned long size, | |
925 | int noblock, int *errcode) | |
926 | { | |
927 | return sock_alloc_send_pskb(sk, size, 0, noblock, errcode); | |
928 | } | |
929 | ||
930 | static void __lock_sock(struct sock *sk) | |
931 | { | |
932 | DEFINE_WAIT(wait); | |
933 | ||
934 | for(;;) { | |
935 | prepare_to_wait_exclusive(&sk->sk_lock.wq, &wait, | |
936 | TASK_UNINTERRUPTIBLE); | |
937 | spin_unlock_bh(&sk->sk_lock.slock); | |
938 | schedule(); | |
939 | spin_lock_bh(&sk->sk_lock.slock); | |
940 | if(!sock_owned_by_user(sk)) | |
941 | break; | |
942 | } | |
943 | finish_wait(&sk->sk_lock.wq, &wait); | |
944 | } | |
945 | ||
946 | static void __release_sock(struct sock *sk) | |
947 | { | |
948 | struct sk_buff *skb = sk->sk_backlog.head; | |
949 | ||
950 | do { | |
951 | sk->sk_backlog.head = sk->sk_backlog.tail = NULL; | |
952 | bh_unlock_sock(sk); | |
953 | ||
954 | do { | |
955 | struct sk_buff *next = skb->next; | |
956 | ||
957 | skb->next = NULL; | |
958 | sk->sk_backlog_rcv(sk, skb); | |
959 | ||
960 | /* | |
961 | * We are in process context here with softirqs | |
962 | * disabled, use cond_resched_softirq() to preempt. | |
963 | * This is safe to do because we've taken the backlog | |
964 | * queue private: | |
965 | */ | |
966 | cond_resched_softirq(); | |
967 | ||
968 | skb = next; | |
969 | } while (skb != NULL); | |
970 | ||
971 | bh_lock_sock(sk); | |
972 | } while((skb = sk->sk_backlog.head) != NULL); | |
973 | } | |
974 | ||
975 | /** | |
976 | * sk_wait_data - wait for data to arrive at sk_receive_queue | |
4dc3b16b PP |
977 | * @sk: sock to wait on |
978 | * @timeo: for how long | |
1da177e4 LT |
979 | * |
980 | * Now socket state including sk->sk_err is changed only under lock, | |
981 | * hence we may omit checks after joining wait queue. | |
982 | * We check receive queue before schedule() only as optimization; | |
983 | * it is very likely that release_sock() added new data. | |
984 | */ | |
985 | int sk_wait_data(struct sock *sk, long *timeo) | |
986 | { | |
987 | int rc; | |
988 | DEFINE_WAIT(wait); | |
989 | ||
990 | prepare_to_wait(sk->sk_sleep, &wait, TASK_INTERRUPTIBLE); | |
991 | set_bit(SOCK_ASYNC_WAITDATA, &sk->sk_socket->flags); | |
992 | rc = sk_wait_event(sk, timeo, !skb_queue_empty(&sk->sk_receive_queue)); | |
993 | clear_bit(SOCK_ASYNC_WAITDATA, &sk->sk_socket->flags); | |
994 | finish_wait(sk->sk_sleep, &wait); | |
995 | return rc; | |
996 | } | |
997 | ||
998 | EXPORT_SYMBOL(sk_wait_data); | |
999 | ||
1000 | /* | |
1001 | * Set of default routines for initialising struct proto_ops when | |
1002 | * the protocol does not support a particular function. In certain | |
1003 | * cases where it makes no sense for a protocol to have a "do nothing" | |
1004 | * function, some default processing is provided. | |
1005 | */ | |
1006 | ||
1007 | int sock_no_bind(struct socket *sock, struct sockaddr *saddr, int len) | |
1008 | { | |
1009 | return -EOPNOTSUPP; | |
1010 | } | |
1011 | ||
1012 | int sock_no_connect(struct socket *sock, struct sockaddr *saddr, | |
1013 | int len, int flags) | |
1014 | { | |
1015 | return -EOPNOTSUPP; | |
1016 | } | |
1017 | ||
1018 | int sock_no_socketpair(struct socket *sock1, struct socket *sock2) | |
1019 | { | |
1020 | return -EOPNOTSUPP; | |
1021 | } | |
1022 | ||
1023 | int sock_no_accept(struct socket *sock, struct socket *newsock, int flags) | |
1024 | { | |
1025 | return -EOPNOTSUPP; | |
1026 | } | |
1027 | ||
1028 | int sock_no_getname(struct socket *sock, struct sockaddr *saddr, | |
1029 | int *len, int peer) | |
1030 | { | |
1031 | return -EOPNOTSUPP; | |
1032 | } | |
1033 | ||
1034 | unsigned int sock_no_poll(struct file * file, struct socket *sock, poll_table *pt) | |
1035 | { | |
1036 | return 0; | |
1037 | } | |
1038 | ||
1039 | int sock_no_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg) | |
1040 | { | |
1041 | return -EOPNOTSUPP; | |
1042 | } | |
1043 | ||
1044 | int sock_no_listen(struct socket *sock, int backlog) | |
1045 | { | |
1046 | return -EOPNOTSUPP; | |
1047 | } | |
1048 | ||
1049 | int sock_no_shutdown(struct socket *sock, int how) | |
1050 | { | |
1051 | return -EOPNOTSUPP; | |
1052 | } | |
1053 | ||
1054 | int sock_no_setsockopt(struct socket *sock, int level, int optname, | |
1055 | char __user *optval, int optlen) | |
1056 | { | |
1057 | return -EOPNOTSUPP; | |
1058 | } | |
1059 | ||
1060 | int sock_no_getsockopt(struct socket *sock, int level, int optname, | |
1061 | char __user *optval, int __user *optlen) | |
1062 | { | |
1063 | return -EOPNOTSUPP; | |
1064 | } | |
1065 | ||
1066 | int sock_no_sendmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *m, | |
1067 | size_t len) | |
1068 | { | |
1069 | return -EOPNOTSUPP; | |
1070 | } | |
1071 | ||
1072 | int sock_no_recvmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *m, | |
1073 | size_t len, int flags) | |
1074 | { | |
1075 | return -EOPNOTSUPP; | |
1076 | } | |
1077 | ||
1078 | int sock_no_mmap(struct file *file, struct socket *sock, struct vm_area_struct *vma) | |
1079 | { | |
1080 | /* Mirror missing mmap method error code */ | |
1081 | return -ENODEV; | |
1082 | } | |
1083 | ||
1084 | ssize_t sock_no_sendpage(struct socket *sock, struct page *page, int offset, size_t size, int flags) | |
1085 | { | |
1086 | ssize_t res; | |
1087 | struct msghdr msg = {.msg_flags = flags}; | |
1088 | struct kvec iov; | |
1089 | char *kaddr = kmap(page); | |
1090 | iov.iov_base = kaddr + offset; | |
1091 | iov.iov_len = size; | |
1092 | res = kernel_sendmsg(sock, &msg, &iov, 1, size); | |
1093 | kunmap(page); | |
1094 | return res; | |
1095 | } | |
1096 | ||
1097 | /* | |
1098 | * Default Socket Callbacks | |
1099 | */ | |
1100 | ||
1101 | static void sock_def_wakeup(struct sock *sk) | |
1102 | { | |
1103 | read_lock(&sk->sk_callback_lock); | |
1104 | if (sk->sk_sleep && waitqueue_active(sk->sk_sleep)) | |
1105 | wake_up_interruptible_all(sk->sk_sleep); | |
1106 | read_unlock(&sk->sk_callback_lock); | |
1107 | } | |
1108 | ||
1109 | static void sock_def_error_report(struct sock *sk) | |
1110 | { | |
1111 | read_lock(&sk->sk_callback_lock); | |
1112 | if (sk->sk_sleep && waitqueue_active(sk->sk_sleep)) | |
1113 | wake_up_interruptible(sk->sk_sleep); | |
1114 | sk_wake_async(sk,0,POLL_ERR); | |
1115 | read_unlock(&sk->sk_callback_lock); | |
1116 | } | |
1117 | ||
1118 | static void sock_def_readable(struct sock *sk, int len) | |
1119 | { | |
1120 | read_lock(&sk->sk_callback_lock); | |
1121 | if (sk->sk_sleep && waitqueue_active(sk->sk_sleep)) | |
1122 | wake_up_interruptible(sk->sk_sleep); | |
1123 | sk_wake_async(sk,1,POLL_IN); | |
1124 | read_unlock(&sk->sk_callback_lock); | |
1125 | } | |
1126 | ||
1127 | static void sock_def_write_space(struct sock *sk) | |
1128 | { | |
1129 | read_lock(&sk->sk_callback_lock); | |
1130 | ||
1131 | /* Do not wake up a writer until he can make "significant" | |
1132 | * progress. --DaveM | |
1133 | */ | |
1134 | if((atomic_read(&sk->sk_wmem_alloc) << 1) <= sk->sk_sndbuf) { | |
1135 | if (sk->sk_sleep && waitqueue_active(sk->sk_sleep)) | |
1136 | wake_up_interruptible(sk->sk_sleep); | |
1137 | ||
1138 | /* Should agree with poll, otherwise some programs break */ | |
1139 | if (sock_writeable(sk)) | |
1140 | sk_wake_async(sk, 2, POLL_OUT); | |
1141 | } | |
1142 | ||
1143 | read_unlock(&sk->sk_callback_lock); | |
1144 | } | |
1145 | ||
1146 | static void sock_def_destruct(struct sock *sk) | |
1147 | { | |
1148 | if (sk->sk_protinfo) | |
1149 | kfree(sk->sk_protinfo); | |
1150 | } | |
1151 | ||
1152 | void sk_send_sigurg(struct sock *sk) | |
1153 | { | |
1154 | if (sk->sk_socket && sk->sk_socket->file) | |
1155 | if (send_sigurg(&sk->sk_socket->file->f_owner)) | |
1156 | sk_wake_async(sk, 3, POLL_PRI); | |
1157 | } | |
1158 | ||
1159 | void sk_reset_timer(struct sock *sk, struct timer_list* timer, | |
1160 | unsigned long expires) | |
1161 | { | |
1162 | if (!mod_timer(timer, expires)) | |
1163 | sock_hold(sk); | |
1164 | } | |
1165 | ||
1166 | EXPORT_SYMBOL(sk_reset_timer); | |
1167 | ||
1168 | void sk_stop_timer(struct sock *sk, struct timer_list* timer) | |
1169 | { | |
1170 | if (timer_pending(timer) && del_timer(timer)) | |
1171 | __sock_put(sk); | |
1172 | } | |
1173 | ||
1174 | EXPORT_SYMBOL(sk_stop_timer); | |
1175 | ||
1176 | void sock_init_data(struct socket *sock, struct sock *sk) | |
1177 | { | |
1178 | skb_queue_head_init(&sk->sk_receive_queue); | |
1179 | skb_queue_head_init(&sk->sk_write_queue); | |
1180 | skb_queue_head_init(&sk->sk_error_queue); | |
1181 | ||
1182 | sk->sk_send_head = NULL; | |
1183 | ||
1184 | init_timer(&sk->sk_timer); | |
1185 | ||
1186 | sk->sk_allocation = GFP_KERNEL; | |
1187 | sk->sk_rcvbuf = sysctl_rmem_default; | |
1188 | sk->sk_sndbuf = sysctl_wmem_default; | |
1189 | sk->sk_state = TCP_CLOSE; | |
1190 | sk->sk_socket = sock; | |
1191 | ||
1192 | sock_set_flag(sk, SOCK_ZAPPED); | |
1193 | ||
1194 | if(sock) | |
1195 | { | |
1196 | sk->sk_type = sock->type; | |
1197 | sk->sk_sleep = &sock->wait; | |
1198 | sock->sk = sk; | |
1199 | } else | |
1200 | sk->sk_sleep = NULL; | |
1201 | ||
1202 | rwlock_init(&sk->sk_dst_lock); | |
1203 | rwlock_init(&sk->sk_callback_lock); | |
1204 | ||
1205 | sk->sk_state_change = sock_def_wakeup; | |
1206 | sk->sk_data_ready = sock_def_readable; | |
1207 | sk->sk_write_space = sock_def_write_space; | |
1208 | sk->sk_error_report = sock_def_error_report; | |
1209 | sk->sk_destruct = sock_def_destruct; | |
1210 | ||
1211 | sk->sk_sndmsg_page = NULL; | |
1212 | sk->sk_sndmsg_off = 0; | |
1213 | ||
1214 | sk->sk_peercred.pid = 0; | |
1215 | sk->sk_peercred.uid = -1; | |
1216 | sk->sk_peercred.gid = -1; | |
1217 | sk->sk_write_pending = 0; | |
1218 | sk->sk_rcvlowat = 1; | |
1219 | sk->sk_rcvtimeo = MAX_SCHEDULE_TIMEOUT; | |
1220 | sk->sk_sndtimeo = MAX_SCHEDULE_TIMEOUT; | |
1221 | ||
1222 | sk->sk_stamp.tv_sec = -1L; | |
1223 | sk->sk_stamp.tv_usec = -1L; | |
1224 | ||
1225 | atomic_set(&sk->sk_refcnt, 1); | |
1226 | } | |
1227 | ||
1228 | void fastcall lock_sock(struct sock *sk) | |
1229 | { | |
1230 | might_sleep(); | |
1231 | spin_lock_bh(&(sk->sk_lock.slock)); | |
1232 | if (sk->sk_lock.owner) | |
1233 | __lock_sock(sk); | |
1234 | sk->sk_lock.owner = (void *)1; | |
1235 | spin_unlock_bh(&(sk->sk_lock.slock)); | |
1236 | } | |
1237 | ||
1238 | EXPORT_SYMBOL(lock_sock); | |
1239 | ||
1240 | void fastcall release_sock(struct sock *sk) | |
1241 | { | |
1242 | spin_lock_bh(&(sk->sk_lock.slock)); | |
1243 | if (sk->sk_backlog.tail) | |
1244 | __release_sock(sk); | |
1245 | sk->sk_lock.owner = NULL; | |
1246 | if (waitqueue_active(&(sk->sk_lock.wq))) | |
1247 | wake_up(&(sk->sk_lock.wq)); | |
1248 | spin_unlock_bh(&(sk->sk_lock.slock)); | |
1249 | } | |
1250 | EXPORT_SYMBOL(release_sock); | |
1251 | ||
1252 | int sock_get_timestamp(struct sock *sk, struct timeval __user *userstamp) | |
1253 | { | |
1254 | if (!sock_flag(sk, SOCK_TIMESTAMP)) | |
1255 | sock_enable_timestamp(sk); | |
1256 | if (sk->sk_stamp.tv_sec == -1) | |
1257 | return -ENOENT; | |
1258 | if (sk->sk_stamp.tv_sec == 0) | |
1259 | do_gettimeofday(&sk->sk_stamp); | |
1260 | return copy_to_user(userstamp, &sk->sk_stamp, sizeof(struct timeval)) ? | |
1261 | -EFAULT : 0; | |
1262 | } | |
1263 | EXPORT_SYMBOL(sock_get_timestamp); | |
1264 | ||
1265 | void sock_enable_timestamp(struct sock *sk) | |
1266 | { | |
1267 | if (!sock_flag(sk, SOCK_TIMESTAMP)) { | |
1268 | sock_set_flag(sk, SOCK_TIMESTAMP); | |
1269 | net_enable_timestamp(); | |
1270 | } | |
1271 | } | |
1272 | EXPORT_SYMBOL(sock_enable_timestamp); | |
1273 | ||
1274 | /* | |
1275 | * Get a socket option on an socket. | |
1276 | * | |
1277 | * FIX: POSIX 1003.1g is very ambiguous here. It states that | |
1278 | * asynchronous errors should be reported by getsockopt. We assume | |
1279 | * this means if you specify SO_ERROR (otherwise whats the point of it). | |
1280 | */ | |
1281 | int sock_common_getsockopt(struct socket *sock, int level, int optname, | |
1282 | char __user *optval, int __user *optlen) | |
1283 | { | |
1284 | struct sock *sk = sock->sk; | |
1285 | ||
1286 | return sk->sk_prot->getsockopt(sk, level, optname, optval, optlen); | |
1287 | } | |
1288 | ||
1289 | EXPORT_SYMBOL(sock_common_getsockopt); | |
1290 | ||
1291 | int sock_common_recvmsg(struct kiocb *iocb, struct socket *sock, | |
1292 | struct msghdr *msg, size_t size, int flags) | |
1293 | { | |
1294 | struct sock *sk = sock->sk; | |
1295 | int addr_len = 0; | |
1296 | int err; | |
1297 | ||
1298 | err = sk->sk_prot->recvmsg(iocb, sk, msg, size, flags & MSG_DONTWAIT, | |
1299 | flags & ~MSG_DONTWAIT, &addr_len); | |
1300 | if (err >= 0) | |
1301 | msg->msg_namelen = addr_len; | |
1302 | return err; | |
1303 | } | |
1304 | ||
1305 | EXPORT_SYMBOL(sock_common_recvmsg); | |
1306 | ||
1307 | /* | |
1308 | * Set socket options on an inet socket. | |
1309 | */ | |
1310 | int sock_common_setsockopt(struct socket *sock, int level, int optname, | |
1311 | char __user *optval, int optlen) | |
1312 | { | |
1313 | struct sock *sk = sock->sk; | |
1314 | ||
1315 | return sk->sk_prot->setsockopt(sk, level, optname, optval, optlen); | |
1316 | } | |
1317 | ||
1318 | EXPORT_SYMBOL(sock_common_setsockopt); | |
1319 | ||
1320 | void sk_common_release(struct sock *sk) | |
1321 | { | |
1322 | if (sk->sk_prot->destroy) | |
1323 | sk->sk_prot->destroy(sk); | |
1324 | ||
1325 | /* | |
1326 | * Observation: when sock_common_release is called, processes have | |
1327 | * no access to socket. But net still has. | |
1328 | * Step one, detach it from networking: | |
1329 | * | |
1330 | * A. Remove from hash tables. | |
1331 | */ | |
1332 | ||
1333 | sk->sk_prot->unhash(sk); | |
1334 | ||
1335 | /* | |
1336 | * In this point socket cannot receive new packets, but it is possible | |
1337 | * that some packets are in flight because some CPU runs receiver and | |
1338 | * did hash table lookup before we unhashed socket. They will achieve | |
1339 | * receive queue and will be purged by socket destructor. | |
1340 | * | |
1341 | * Also we still have packets pending on receive queue and probably, | |
1342 | * our own packets waiting in device queues. sock_destroy will drain | |
1343 | * receive queue, but transmitted packets will delay socket destruction | |
1344 | * until the last reference will be released. | |
1345 | */ | |
1346 | ||
1347 | sock_orphan(sk); | |
1348 | ||
1349 | xfrm_sk_free_policy(sk); | |
1350 | ||
1351 | #ifdef INET_REFCNT_DEBUG | |
1352 | if (atomic_read(&sk->sk_refcnt) != 1) | |
1353 | printk(KERN_DEBUG "Destruction of the socket %p delayed, c=%d\n", | |
1354 | sk, atomic_read(&sk->sk_refcnt)); | |
1355 | #endif | |
1356 | sock_put(sk); | |
1357 | } | |
1358 | ||
1359 | EXPORT_SYMBOL(sk_common_release); | |
1360 | ||
1361 | static DEFINE_RWLOCK(proto_list_lock); | |
1362 | static LIST_HEAD(proto_list); | |
1363 | ||
1364 | int proto_register(struct proto *prot, int alloc_slab) | |
1365 | { | |
1366 | int rc = -ENOBUFS; | |
1367 | ||
1da177e4 LT |
1368 | if (alloc_slab) { |
1369 | prot->slab = kmem_cache_create(prot->name, prot->obj_size, 0, | |
1370 | SLAB_HWCACHE_ALIGN, NULL, NULL); | |
1371 | ||
1372 | if (prot->slab == NULL) { | |
1373 | printk(KERN_CRIT "%s: Can't create sock SLAB cache!\n", | |
1374 | prot->name); | |
2a278051 | 1375 | goto out; |
1da177e4 LT |
1376 | } |
1377 | } | |
1378 | ||
2a278051 | 1379 | write_lock(&proto_list_lock); |
1da177e4 | 1380 | list_add(&prot->node, &proto_list); |
1da177e4 | 1381 | write_unlock(&proto_list_lock); |
2a278051 ACM |
1382 | rc = 0; |
1383 | out: | |
1da177e4 LT |
1384 | return rc; |
1385 | } | |
1386 | ||
1387 | EXPORT_SYMBOL(proto_register); | |
1388 | ||
1389 | void proto_unregister(struct proto *prot) | |
1390 | { | |
1391 | write_lock(&proto_list_lock); | |
1392 | ||
1393 | if (prot->slab != NULL) { | |
1394 | kmem_cache_destroy(prot->slab); | |
1395 | prot->slab = NULL; | |
1396 | } | |
1397 | ||
1398 | list_del(&prot->node); | |
1399 | write_unlock(&proto_list_lock); | |
1400 | } | |
1401 | ||
1402 | EXPORT_SYMBOL(proto_unregister); | |
1403 | ||
1404 | #ifdef CONFIG_PROC_FS | |
1405 | static inline struct proto *__proto_head(void) | |
1406 | { | |
1407 | return list_entry(proto_list.next, struct proto, node); | |
1408 | } | |
1409 | ||
1410 | static inline struct proto *proto_head(void) | |
1411 | { | |
1412 | return list_empty(&proto_list) ? NULL : __proto_head(); | |
1413 | } | |
1414 | ||
1415 | static inline struct proto *proto_next(struct proto *proto) | |
1416 | { | |
1417 | return proto->node.next == &proto_list ? NULL : | |
1418 | list_entry(proto->node.next, struct proto, node); | |
1419 | } | |
1420 | ||
1421 | static inline struct proto *proto_get_idx(loff_t pos) | |
1422 | { | |
1423 | struct proto *proto; | |
1424 | loff_t i = 0; | |
1425 | ||
1426 | list_for_each_entry(proto, &proto_list, node) | |
1427 | if (i++ == pos) | |
1428 | goto out; | |
1429 | ||
1430 | proto = NULL; | |
1431 | out: | |
1432 | return proto; | |
1433 | } | |
1434 | ||
1435 | static void *proto_seq_start(struct seq_file *seq, loff_t *pos) | |
1436 | { | |
1437 | read_lock(&proto_list_lock); | |
1438 | return *pos ? proto_get_idx(*pos - 1) : SEQ_START_TOKEN; | |
1439 | } | |
1440 | ||
1441 | static void *proto_seq_next(struct seq_file *seq, void *v, loff_t *pos) | |
1442 | { | |
1443 | ++*pos; | |
1444 | return v == SEQ_START_TOKEN ? proto_head() : proto_next(v); | |
1445 | } | |
1446 | ||
1447 | static void proto_seq_stop(struct seq_file *seq, void *v) | |
1448 | { | |
1449 | read_unlock(&proto_list_lock); | |
1450 | } | |
1451 | ||
1452 | static char proto_method_implemented(const void *method) | |
1453 | { | |
1454 | return method == NULL ? 'n' : 'y'; | |
1455 | } | |
1456 | ||
1457 | static void proto_seq_printf(struct seq_file *seq, struct proto *proto) | |
1458 | { | |
1459 | seq_printf(seq, "%-9s %4u %6d %6d %-3s %6u %-3s %-10s " | |
1460 | "%2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c\n", | |
1461 | proto->name, | |
1462 | proto->obj_size, | |
1463 | proto->sockets_allocated != NULL ? atomic_read(proto->sockets_allocated) : -1, | |
1464 | proto->memory_allocated != NULL ? atomic_read(proto->memory_allocated) : -1, | |
1465 | proto->memory_pressure != NULL ? *proto->memory_pressure ? "yes" : "no" : "NI", | |
1466 | proto->max_header, | |
1467 | proto->slab == NULL ? "no" : "yes", | |
1468 | module_name(proto->owner), | |
1469 | proto_method_implemented(proto->close), | |
1470 | proto_method_implemented(proto->connect), | |
1471 | proto_method_implemented(proto->disconnect), | |
1472 | proto_method_implemented(proto->accept), | |
1473 | proto_method_implemented(proto->ioctl), | |
1474 | proto_method_implemented(proto->init), | |
1475 | proto_method_implemented(proto->destroy), | |
1476 | proto_method_implemented(proto->shutdown), | |
1477 | proto_method_implemented(proto->setsockopt), | |
1478 | proto_method_implemented(proto->getsockopt), | |
1479 | proto_method_implemented(proto->sendmsg), | |
1480 | proto_method_implemented(proto->recvmsg), | |
1481 | proto_method_implemented(proto->sendpage), | |
1482 | proto_method_implemented(proto->bind), | |
1483 | proto_method_implemented(proto->backlog_rcv), | |
1484 | proto_method_implemented(proto->hash), | |
1485 | proto_method_implemented(proto->unhash), | |
1486 | proto_method_implemented(proto->get_port), | |
1487 | proto_method_implemented(proto->enter_memory_pressure)); | |
1488 | } | |
1489 | ||
1490 | static int proto_seq_show(struct seq_file *seq, void *v) | |
1491 | { | |
1492 | if (v == SEQ_START_TOKEN) | |
1493 | seq_printf(seq, "%-9s %-4s %-8s %-6s %-5s %-7s %-4s %-10s %s", | |
1494 | "protocol", | |
1495 | "size", | |
1496 | "sockets", | |
1497 | "memory", | |
1498 | "press", | |
1499 | "maxhdr", | |
1500 | "slab", | |
1501 | "module", | |
1502 | "cl co di ac io in de sh ss gs se re sp bi br ha uh gp em\n"); | |
1503 | else | |
1504 | proto_seq_printf(seq, v); | |
1505 | return 0; | |
1506 | } | |
1507 | ||
1508 | static struct seq_operations proto_seq_ops = { | |
1509 | .start = proto_seq_start, | |
1510 | .next = proto_seq_next, | |
1511 | .stop = proto_seq_stop, | |
1512 | .show = proto_seq_show, | |
1513 | }; | |
1514 | ||
1515 | static int proto_seq_open(struct inode *inode, struct file *file) | |
1516 | { | |
1517 | return seq_open(file, &proto_seq_ops); | |
1518 | } | |
1519 | ||
1520 | static struct file_operations proto_seq_fops = { | |
1521 | .owner = THIS_MODULE, | |
1522 | .open = proto_seq_open, | |
1523 | .read = seq_read, | |
1524 | .llseek = seq_lseek, | |
1525 | .release = seq_release, | |
1526 | }; | |
1527 | ||
1528 | static int __init proto_init(void) | |
1529 | { | |
1530 | /* register /proc/net/protocols */ | |
1531 | return proc_net_fops_create("protocols", S_IRUGO, &proto_seq_fops) == NULL ? -ENOBUFS : 0; | |
1532 | } | |
1533 | ||
1534 | subsys_initcall(proto_init); | |
1535 | ||
1536 | #endif /* PROC_FS */ | |
1537 | ||
1538 | EXPORT_SYMBOL(sk_alloc); | |
1539 | EXPORT_SYMBOL(sk_free); | |
1540 | EXPORT_SYMBOL(sk_send_sigurg); | |
1541 | EXPORT_SYMBOL(sock_alloc_send_skb); | |
1542 | EXPORT_SYMBOL(sock_init_data); | |
1543 | EXPORT_SYMBOL(sock_kfree_s); | |
1544 | EXPORT_SYMBOL(sock_kmalloc); | |
1545 | EXPORT_SYMBOL(sock_no_accept); | |
1546 | EXPORT_SYMBOL(sock_no_bind); | |
1547 | EXPORT_SYMBOL(sock_no_connect); | |
1548 | EXPORT_SYMBOL(sock_no_getname); | |
1549 | EXPORT_SYMBOL(sock_no_getsockopt); | |
1550 | EXPORT_SYMBOL(sock_no_ioctl); | |
1551 | EXPORT_SYMBOL(sock_no_listen); | |
1552 | EXPORT_SYMBOL(sock_no_mmap); | |
1553 | EXPORT_SYMBOL(sock_no_poll); | |
1554 | EXPORT_SYMBOL(sock_no_recvmsg); | |
1555 | EXPORT_SYMBOL(sock_no_sendmsg); | |
1556 | EXPORT_SYMBOL(sock_no_sendpage); | |
1557 | EXPORT_SYMBOL(sock_no_setsockopt); | |
1558 | EXPORT_SYMBOL(sock_no_shutdown); | |
1559 | EXPORT_SYMBOL(sock_no_socketpair); | |
1560 | EXPORT_SYMBOL(sock_rfree); | |
1561 | EXPORT_SYMBOL(sock_setsockopt); | |
1562 | EXPORT_SYMBOL(sock_wfree); | |
1563 | EXPORT_SYMBOL(sock_wmalloc); | |
1564 | EXPORT_SYMBOL(sock_i_uid); | |
1565 | EXPORT_SYMBOL(sock_i_ino); | |
1566 | #ifdef CONFIG_SYSCTL | |
1567 | EXPORT_SYMBOL(sysctl_optmem_max); | |
1568 | EXPORT_SYMBOL(sysctl_rmem_max); | |
1569 | EXPORT_SYMBOL(sysctl_wmem_max); | |
1570 | #endif |