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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 | ||
4fc268d2 | 94 | #include <linux/capability.h> |
1da177e4 LT |
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 | ||
f0088a50 DV |
189 | int sock_queue_rcv_skb(struct sock *sk, struct sk_buff *skb) |
190 | { | |
191 | int err = 0; | |
192 | int skb_len; | |
193 | ||
194 | /* Cast skb->rcvbuf to unsigned... It's pointless, but reduces | |
195 | number of warnings when compiling with -W --ANK | |
196 | */ | |
197 | if (atomic_read(&sk->sk_rmem_alloc) + skb->truesize >= | |
198 | (unsigned)sk->sk_rcvbuf) { | |
199 | err = -ENOMEM; | |
200 | goto out; | |
201 | } | |
202 | ||
203 | /* It would be deadlock, if sock_queue_rcv_skb is used | |
204 | with socket lock! We assume that users of this | |
205 | function are lock free. | |
206 | */ | |
207 | err = sk_filter(sk, skb, 1); | |
208 | if (err) | |
209 | goto out; | |
210 | ||
211 | skb->dev = NULL; | |
212 | skb_set_owner_r(skb, sk); | |
213 | ||
214 | /* Cache the SKB length before we tack it onto the receive | |
215 | * queue. Once it is added it no longer belongs to us and | |
216 | * may be freed by other threads of control pulling packets | |
217 | * from the queue. | |
218 | */ | |
219 | skb_len = skb->len; | |
220 | ||
221 | skb_queue_tail(&sk->sk_receive_queue, skb); | |
222 | ||
223 | if (!sock_flag(sk, SOCK_DEAD)) | |
224 | sk->sk_data_ready(sk, skb_len); | |
225 | out: | |
226 | return err; | |
227 | } | |
228 | EXPORT_SYMBOL(sock_queue_rcv_skb); | |
229 | ||
230 | int sk_receive_skb(struct sock *sk, struct sk_buff *skb) | |
231 | { | |
232 | int rc = NET_RX_SUCCESS; | |
233 | ||
234 | if (sk_filter(sk, skb, 0)) | |
235 | goto discard_and_relse; | |
236 | ||
237 | skb->dev = NULL; | |
238 | ||
239 | bh_lock_sock(sk); | |
240 | if (!sock_owned_by_user(sk)) | |
241 | rc = sk->sk_backlog_rcv(sk, skb); | |
242 | else | |
243 | sk_add_backlog(sk, skb); | |
244 | bh_unlock_sock(sk); | |
245 | out: | |
246 | sock_put(sk); | |
247 | return rc; | |
248 | discard_and_relse: | |
249 | kfree_skb(skb); | |
250 | goto out; | |
251 | } | |
252 | EXPORT_SYMBOL(sk_receive_skb); | |
253 | ||
254 | struct dst_entry *__sk_dst_check(struct sock *sk, u32 cookie) | |
255 | { | |
256 | struct dst_entry *dst = sk->sk_dst_cache; | |
257 | ||
258 | if (dst && dst->obsolete && dst->ops->check(dst, cookie) == NULL) { | |
259 | sk->sk_dst_cache = NULL; | |
260 | dst_release(dst); | |
261 | return NULL; | |
262 | } | |
263 | ||
264 | return dst; | |
265 | } | |
266 | EXPORT_SYMBOL(__sk_dst_check); | |
267 | ||
268 | struct dst_entry *sk_dst_check(struct sock *sk, u32 cookie) | |
269 | { | |
270 | struct dst_entry *dst = sk_dst_get(sk); | |
271 | ||
272 | if (dst && dst->obsolete && dst->ops->check(dst, cookie) == NULL) { | |
273 | sk_dst_reset(sk); | |
274 | dst_release(dst); | |
275 | return NULL; | |
276 | } | |
277 | ||
278 | return dst; | |
279 | } | |
280 | EXPORT_SYMBOL(sk_dst_check); | |
281 | ||
1da177e4 LT |
282 | /* |
283 | * This is meant for all protocols to use and covers goings on | |
284 | * at the socket level. Everything here is generic. | |
285 | */ | |
286 | ||
287 | int sock_setsockopt(struct socket *sock, int level, int optname, | |
288 | char __user *optval, int optlen) | |
289 | { | |
290 | struct sock *sk=sock->sk; | |
291 | struct sk_filter *filter; | |
292 | int val; | |
293 | int valbool; | |
294 | struct linger ling; | |
295 | int ret = 0; | |
296 | ||
297 | /* | |
298 | * Options without arguments | |
299 | */ | |
300 | ||
301 | #ifdef SO_DONTLINGER /* Compatibility item... */ | |
a77be819 KM |
302 | if (optname == SO_DONTLINGER) { |
303 | lock_sock(sk); | |
304 | sock_reset_flag(sk, SOCK_LINGER); | |
305 | release_sock(sk); | |
306 | return 0; | |
1da177e4 | 307 | } |
a77be819 KM |
308 | #endif |
309 | ||
1da177e4 LT |
310 | if(optlen<sizeof(int)) |
311 | return(-EINVAL); | |
312 | ||
313 | if (get_user(val, (int __user *)optval)) | |
314 | return -EFAULT; | |
315 | ||
316 | valbool = val?1:0; | |
317 | ||
318 | lock_sock(sk); | |
319 | ||
320 | switch(optname) | |
321 | { | |
322 | case SO_DEBUG: | |
323 | if(val && !capable(CAP_NET_ADMIN)) | |
324 | { | |
325 | ret = -EACCES; | |
326 | } | |
327 | else if (valbool) | |
328 | sock_set_flag(sk, SOCK_DBG); | |
329 | else | |
330 | sock_reset_flag(sk, SOCK_DBG); | |
331 | break; | |
332 | case SO_REUSEADDR: | |
333 | sk->sk_reuse = valbool; | |
334 | break; | |
335 | case SO_TYPE: | |
336 | case SO_ERROR: | |
337 | ret = -ENOPROTOOPT; | |
338 | break; | |
339 | case SO_DONTROUTE: | |
340 | if (valbool) | |
341 | sock_set_flag(sk, SOCK_LOCALROUTE); | |
342 | else | |
343 | sock_reset_flag(sk, SOCK_LOCALROUTE); | |
344 | break; | |
345 | case SO_BROADCAST: | |
346 | sock_valbool_flag(sk, SOCK_BROADCAST, valbool); | |
347 | break; | |
348 | case SO_SNDBUF: | |
349 | /* Don't error on this BSD doesn't and if you think | |
350 | about it this is right. Otherwise apps have to | |
351 | play 'guess the biggest size' games. RCVBUF/SNDBUF | |
352 | are treated in BSD as hints */ | |
353 | ||
354 | if (val > sysctl_wmem_max) | |
355 | val = sysctl_wmem_max; | |
b0573dea | 356 | set_sndbuf: |
1da177e4 LT |
357 | sk->sk_userlocks |= SOCK_SNDBUF_LOCK; |
358 | if ((val * 2) < SOCK_MIN_SNDBUF) | |
359 | sk->sk_sndbuf = SOCK_MIN_SNDBUF; | |
360 | else | |
361 | sk->sk_sndbuf = val * 2; | |
362 | ||
363 | /* | |
364 | * Wake up sending tasks if we | |
365 | * upped the value. | |
366 | */ | |
367 | sk->sk_write_space(sk); | |
368 | break; | |
369 | ||
b0573dea PM |
370 | case SO_SNDBUFFORCE: |
371 | if (!capable(CAP_NET_ADMIN)) { | |
372 | ret = -EPERM; | |
373 | break; | |
374 | } | |
375 | goto set_sndbuf; | |
376 | ||
1da177e4 LT |
377 | case SO_RCVBUF: |
378 | /* Don't error on this BSD doesn't and if you think | |
379 | about it this is right. Otherwise apps have to | |
380 | play 'guess the biggest size' games. RCVBUF/SNDBUF | |
381 | are treated in BSD as hints */ | |
382 | ||
383 | if (val > sysctl_rmem_max) | |
384 | val = sysctl_rmem_max; | |
b0573dea | 385 | set_rcvbuf: |
1da177e4 | 386 | sk->sk_userlocks |= SOCK_RCVBUF_LOCK; |
c08e4961 AM |
387 | /* |
388 | * We double it on the way in to account for | |
389 | * "struct sk_buff" etc. overhead. Applications | |
390 | * assume that the SO_RCVBUF setting they make will | |
391 | * allow that much actual data to be received on that | |
392 | * socket. | |
393 | * | |
394 | * Applications are unaware that "struct sk_buff" and | |
395 | * other overheads allocate from the receive buffer | |
396 | * during socket buffer allocation. | |
397 | * | |
398 | * And after considering the possible alternatives, | |
399 | * returning the value we actually used in getsockopt | |
400 | * is the most desirable behavior. | |
401 | */ | |
1da177e4 LT |
402 | if ((val * 2) < SOCK_MIN_RCVBUF) |
403 | sk->sk_rcvbuf = SOCK_MIN_RCVBUF; | |
404 | else | |
405 | sk->sk_rcvbuf = val * 2; | |
406 | break; | |
407 | ||
b0573dea PM |
408 | case SO_RCVBUFFORCE: |
409 | if (!capable(CAP_NET_ADMIN)) { | |
410 | ret = -EPERM; | |
411 | break; | |
412 | } | |
413 | goto set_rcvbuf; | |
414 | ||
1da177e4 LT |
415 | case SO_KEEPALIVE: |
416 | #ifdef CONFIG_INET | |
417 | if (sk->sk_protocol == IPPROTO_TCP) | |
418 | tcp_set_keepalive(sk, valbool); | |
419 | #endif | |
420 | sock_valbool_flag(sk, SOCK_KEEPOPEN, valbool); | |
421 | break; | |
422 | ||
423 | case SO_OOBINLINE: | |
424 | sock_valbool_flag(sk, SOCK_URGINLINE, valbool); | |
425 | break; | |
426 | ||
427 | case SO_NO_CHECK: | |
428 | sk->sk_no_check = valbool; | |
429 | break; | |
430 | ||
431 | case SO_PRIORITY: | |
432 | if ((val >= 0 && val <= 6) || capable(CAP_NET_ADMIN)) | |
433 | sk->sk_priority = val; | |
434 | else | |
435 | ret = -EPERM; | |
436 | break; | |
437 | ||
438 | case SO_LINGER: | |
439 | if(optlen<sizeof(ling)) { | |
440 | ret = -EINVAL; /* 1003.1g */ | |
441 | break; | |
442 | } | |
443 | if (copy_from_user(&ling,optval,sizeof(ling))) { | |
444 | ret = -EFAULT; | |
445 | break; | |
446 | } | |
447 | if (!ling.l_onoff) | |
448 | sock_reset_flag(sk, SOCK_LINGER); | |
449 | else { | |
450 | #if (BITS_PER_LONG == 32) | |
9261c9b0 | 451 | if ((unsigned int)ling.l_linger >= MAX_SCHEDULE_TIMEOUT/HZ) |
1da177e4 LT |
452 | sk->sk_lingertime = MAX_SCHEDULE_TIMEOUT; |
453 | else | |
454 | #endif | |
9261c9b0 | 455 | sk->sk_lingertime = (unsigned int)ling.l_linger * HZ; |
1da177e4 LT |
456 | sock_set_flag(sk, SOCK_LINGER); |
457 | } | |
458 | break; | |
459 | ||
460 | case SO_BSDCOMPAT: | |
461 | sock_warn_obsolete_bsdism("setsockopt"); | |
462 | break; | |
463 | ||
464 | case SO_PASSCRED: | |
465 | if (valbool) | |
466 | set_bit(SOCK_PASSCRED, &sock->flags); | |
467 | else | |
468 | clear_bit(SOCK_PASSCRED, &sock->flags); | |
469 | break; | |
470 | ||
471 | case SO_TIMESTAMP: | |
472 | if (valbool) { | |
473 | sock_set_flag(sk, SOCK_RCVTSTAMP); | |
474 | sock_enable_timestamp(sk); | |
475 | } else | |
476 | sock_reset_flag(sk, SOCK_RCVTSTAMP); | |
477 | break; | |
478 | ||
479 | case SO_RCVLOWAT: | |
480 | if (val < 0) | |
481 | val = INT_MAX; | |
482 | sk->sk_rcvlowat = val ? : 1; | |
483 | break; | |
484 | ||
485 | case SO_RCVTIMEO: | |
486 | ret = sock_set_timeout(&sk->sk_rcvtimeo, optval, optlen); | |
487 | break; | |
488 | ||
489 | case SO_SNDTIMEO: | |
490 | ret = sock_set_timeout(&sk->sk_sndtimeo, optval, optlen); | |
491 | break; | |
492 | ||
493 | #ifdef CONFIG_NETDEVICES | |
494 | case SO_BINDTODEVICE: | |
495 | { | |
496 | char devname[IFNAMSIZ]; | |
497 | ||
498 | /* Sorry... */ | |
499 | if (!capable(CAP_NET_RAW)) { | |
500 | ret = -EPERM; | |
501 | break; | |
502 | } | |
503 | ||
504 | /* Bind this socket to a particular device like "eth0", | |
505 | * as specified in the passed interface name. If the | |
506 | * name is "" or the option length is zero the socket | |
507 | * is not bound. | |
508 | */ | |
509 | ||
510 | if (!valbool) { | |
511 | sk->sk_bound_dev_if = 0; | |
512 | } else { | |
f67ed26f DM |
513 | if (optlen > IFNAMSIZ - 1) |
514 | optlen = IFNAMSIZ - 1; | |
515 | memset(devname, 0, sizeof(devname)); | |
1da177e4 LT |
516 | if (copy_from_user(devname, optval, optlen)) { |
517 | ret = -EFAULT; | |
518 | break; | |
519 | } | |
520 | ||
521 | /* Remove any cached route for this socket. */ | |
522 | sk_dst_reset(sk); | |
523 | ||
524 | if (devname[0] == '\0') { | |
525 | sk->sk_bound_dev_if = 0; | |
526 | } else { | |
527 | struct net_device *dev = dev_get_by_name(devname); | |
528 | if (!dev) { | |
529 | ret = -ENODEV; | |
530 | break; | |
531 | } | |
532 | sk->sk_bound_dev_if = dev->ifindex; | |
533 | dev_put(dev); | |
534 | } | |
535 | } | |
536 | break; | |
537 | } | |
538 | #endif | |
539 | ||
540 | ||
541 | case SO_ATTACH_FILTER: | |
542 | ret = -EINVAL; | |
543 | if (optlen == sizeof(struct sock_fprog)) { | |
544 | struct sock_fprog fprog; | |
545 | ||
546 | ret = -EFAULT; | |
547 | if (copy_from_user(&fprog, optval, sizeof(fprog))) | |
548 | break; | |
549 | ||
550 | ret = sk_attach_filter(&fprog, sk); | |
551 | } | |
552 | break; | |
553 | ||
554 | case SO_DETACH_FILTER: | |
555 | spin_lock_bh(&sk->sk_lock.slock); | |
556 | filter = sk->sk_filter; | |
557 | if (filter) { | |
558 | sk->sk_filter = NULL; | |
559 | spin_unlock_bh(&sk->sk_lock.slock); | |
560 | sk_filter_release(sk, filter); | |
561 | break; | |
562 | } | |
563 | spin_unlock_bh(&sk->sk_lock.slock); | |
564 | ret = -ENONET; | |
565 | break; | |
566 | ||
877ce7c1 CZ |
567 | case SO_PASSSEC: |
568 | if (valbool) | |
569 | set_bit(SOCK_PASSSEC, &sock->flags); | |
570 | else | |
571 | clear_bit(SOCK_PASSSEC, &sock->flags); | |
572 | break; | |
573 | ||
1da177e4 LT |
574 | /* We implement the SO_SNDLOWAT etc to |
575 | not be settable (1003.1g 5.3) */ | |
576 | default: | |
577 | ret = -ENOPROTOOPT; | |
578 | break; | |
579 | } | |
580 | release_sock(sk); | |
581 | return ret; | |
582 | } | |
583 | ||
584 | ||
585 | int sock_getsockopt(struct socket *sock, int level, int optname, | |
586 | char __user *optval, int __user *optlen) | |
587 | { | |
588 | struct sock *sk = sock->sk; | |
589 | ||
590 | union | |
591 | { | |
592 | int val; | |
593 | struct linger ling; | |
594 | struct timeval tm; | |
595 | } v; | |
596 | ||
597 | unsigned int lv = sizeof(int); | |
598 | int len; | |
599 | ||
600 | if(get_user(len,optlen)) | |
601 | return -EFAULT; | |
602 | if(len < 0) | |
603 | return -EINVAL; | |
604 | ||
605 | switch(optname) | |
606 | { | |
607 | case SO_DEBUG: | |
608 | v.val = sock_flag(sk, SOCK_DBG); | |
609 | break; | |
610 | ||
611 | case SO_DONTROUTE: | |
612 | v.val = sock_flag(sk, SOCK_LOCALROUTE); | |
613 | break; | |
614 | ||
615 | case SO_BROADCAST: | |
616 | v.val = !!sock_flag(sk, SOCK_BROADCAST); | |
617 | break; | |
618 | ||
619 | case SO_SNDBUF: | |
620 | v.val = sk->sk_sndbuf; | |
621 | break; | |
622 | ||
623 | case SO_RCVBUF: | |
624 | v.val = sk->sk_rcvbuf; | |
625 | break; | |
626 | ||
627 | case SO_REUSEADDR: | |
628 | v.val = sk->sk_reuse; | |
629 | break; | |
630 | ||
631 | case SO_KEEPALIVE: | |
632 | v.val = !!sock_flag(sk, SOCK_KEEPOPEN); | |
633 | break; | |
634 | ||
635 | case SO_TYPE: | |
636 | v.val = sk->sk_type; | |
637 | break; | |
638 | ||
639 | case SO_ERROR: | |
640 | v.val = -sock_error(sk); | |
641 | if(v.val==0) | |
642 | v.val = xchg(&sk->sk_err_soft, 0); | |
643 | break; | |
644 | ||
645 | case SO_OOBINLINE: | |
646 | v.val = !!sock_flag(sk, SOCK_URGINLINE); | |
647 | break; | |
648 | ||
649 | case SO_NO_CHECK: | |
650 | v.val = sk->sk_no_check; | |
651 | break; | |
652 | ||
653 | case SO_PRIORITY: | |
654 | v.val = sk->sk_priority; | |
655 | break; | |
656 | ||
657 | case SO_LINGER: | |
658 | lv = sizeof(v.ling); | |
659 | v.ling.l_onoff = !!sock_flag(sk, SOCK_LINGER); | |
660 | v.ling.l_linger = sk->sk_lingertime / HZ; | |
661 | break; | |
662 | ||
663 | case SO_BSDCOMPAT: | |
664 | sock_warn_obsolete_bsdism("getsockopt"); | |
665 | break; | |
666 | ||
667 | case SO_TIMESTAMP: | |
668 | v.val = sock_flag(sk, SOCK_RCVTSTAMP); | |
669 | break; | |
670 | ||
671 | case SO_RCVTIMEO: | |
672 | lv=sizeof(struct timeval); | |
673 | if (sk->sk_rcvtimeo == MAX_SCHEDULE_TIMEOUT) { | |
674 | v.tm.tv_sec = 0; | |
675 | v.tm.tv_usec = 0; | |
676 | } else { | |
677 | v.tm.tv_sec = sk->sk_rcvtimeo / HZ; | |
678 | v.tm.tv_usec = ((sk->sk_rcvtimeo % HZ) * 1000000) / HZ; | |
679 | } | |
680 | break; | |
681 | ||
682 | case SO_SNDTIMEO: | |
683 | lv=sizeof(struct timeval); | |
684 | if (sk->sk_sndtimeo == MAX_SCHEDULE_TIMEOUT) { | |
685 | v.tm.tv_sec = 0; | |
686 | v.tm.tv_usec = 0; | |
687 | } else { | |
688 | v.tm.tv_sec = sk->sk_sndtimeo / HZ; | |
689 | v.tm.tv_usec = ((sk->sk_sndtimeo % HZ) * 1000000) / HZ; | |
690 | } | |
691 | break; | |
692 | ||
693 | case SO_RCVLOWAT: | |
694 | v.val = sk->sk_rcvlowat; | |
695 | break; | |
696 | ||
697 | case SO_SNDLOWAT: | |
698 | v.val=1; | |
699 | break; | |
700 | ||
701 | case SO_PASSCRED: | |
702 | v.val = test_bit(SOCK_PASSCRED, &sock->flags) ? 1 : 0; | |
703 | break; | |
704 | ||
705 | case SO_PEERCRED: | |
706 | if (len > sizeof(sk->sk_peercred)) | |
707 | len = sizeof(sk->sk_peercred); | |
708 | if (copy_to_user(optval, &sk->sk_peercred, len)) | |
709 | return -EFAULT; | |
710 | goto lenout; | |
711 | ||
712 | case SO_PEERNAME: | |
713 | { | |
714 | char address[128]; | |
715 | ||
716 | if (sock->ops->getname(sock, (struct sockaddr *)address, &lv, 2)) | |
717 | return -ENOTCONN; | |
718 | if (lv < len) | |
719 | return -EINVAL; | |
720 | if (copy_to_user(optval, address, len)) | |
721 | return -EFAULT; | |
722 | goto lenout; | |
723 | } | |
724 | ||
725 | /* Dubious BSD thing... Probably nobody even uses it, but | |
726 | * the UNIX standard wants it for whatever reason... -DaveM | |
727 | */ | |
728 | case SO_ACCEPTCONN: | |
729 | v.val = sk->sk_state == TCP_LISTEN; | |
730 | break; | |
731 | ||
877ce7c1 CZ |
732 | case SO_PASSSEC: |
733 | v.val = test_bit(SOCK_PASSSEC, &sock->flags) ? 1 : 0; | |
734 | break; | |
735 | ||
1da177e4 | 736 | case SO_PEERSEC: |
2c7946a7 | 737 | return security_socket_getpeersec_stream(sock, optval, optlen, len); |
1da177e4 LT |
738 | |
739 | default: | |
740 | return(-ENOPROTOOPT); | |
741 | } | |
742 | if (len > lv) | |
743 | len = lv; | |
744 | if (copy_to_user(optval, &v, len)) | |
745 | return -EFAULT; | |
746 | lenout: | |
747 | if (put_user(len, optlen)) | |
748 | return -EFAULT; | |
749 | return 0; | |
750 | } | |
751 | ||
752 | /** | |
753 | * sk_alloc - All socket objects are allocated here | |
4dc3b16b PP |
754 | * @family: protocol family |
755 | * @priority: for allocation (%GFP_KERNEL, %GFP_ATOMIC, etc) | |
756 | * @prot: struct proto associated with this new sock instance | |
757 | * @zero_it: if we should zero the newly allocated sock | |
1da177e4 | 758 | */ |
dd0fc66f | 759 | struct sock *sk_alloc(int family, gfp_t priority, |
86a76caf | 760 | struct proto *prot, int zero_it) |
1da177e4 LT |
761 | { |
762 | struct sock *sk = NULL; | |
763 | kmem_cache_t *slab = prot->slab; | |
764 | ||
765 | if (slab != NULL) | |
766 | sk = kmem_cache_alloc(slab, priority); | |
767 | else | |
768 | sk = kmalloc(prot->obj_size, priority); | |
769 | ||
770 | if (sk) { | |
771 | if (zero_it) { | |
772 | memset(sk, 0, prot->obj_size); | |
773 | sk->sk_family = family; | |
476e19cf ACM |
774 | /* |
775 | * See comment in struct sock definition to understand | |
776 | * why we need sk_prot_creator -acme | |
777 | */ | |
778 | sk->sk_prot = sk->sk_prot_creator = prot; | |
1da177e4 LT |
779 | sock_lock_init(sk); |
780 | } | |
781 | ||
a79af59e FF |
782 | if (security_sk_alloc(sk, family, priority)) |
783 | goto out_free; | |
784 | ||
785 | if (!try_module_get(prot->owner)) | |
786 | goto out_free; | |
1da177e4 LT |
787 | } |
788 | return sk; | |
a79af59e FF |
789 | |
790 | out_free: | |
791 | if (slab != NULL) | |
792 | kmem_cache_free(slab, sk); | |
793 | else | |
794 | kfree(sk); | |
795 | return NULL; | |
1da177e4 LT |
796 | } |
797 | ||
798 | void sk_free(struct sock *sk) | |
799 | { | |
800 | struct sk_filter *filter; | |
476e19cf | 801 | struct module *owner = sk->sk_prot_creator->owner; |
1da177e4 LT |
802 | |
803 | if (sk->sk_destruct) | |
804 | sk->sk_destruct(sk); | |
805 | ||
806 | filter = sk->sk_filter; | |
807 | if (filter) { | |
808 | sk_filter_release(sk, filter); | |
809 | sk->sk_filter = NULL; | |
810 | } | |
811 | ||
812 | sock_disable_timestamp(sk); | |
813 | ||
814 | if (atomic_read(&sk->sk_omem_alloc)) | |
815 | printk(KERN_DEBUG "%s: optmem leakage (%d bytes) detected.\n", | |
816 | __FUNCTION__, atomic_read(&sk->sk_omem_alloc)); | |
817 | ||
818 | security_sk_free(sk); | |
476e19cf ACM |
819 | if (sk->sk_prot_creator->slab != NULL) |
820 | kmem_cache_free(sk->sk_prot_creator->slab, sk); | |
1da177e4 LT |
821 | else |
822 | kfree(sk); | |
823 | module_put(owner); | |
824 | } | |
825 | ||
dd0fc66f | 826 | struct sock *sk_clone(const struct sock *sk, const gfp_t priority) |
87d11ceb ACM |
827 | { |
828 | struct sock *newsk = sk_alloc(sk->sk_family, priority, sk->sk_prot, 0); | |
829 | ||
830 | if (newsk != NULL) { | |
831 | struct sk_filter *filter; | |
832 | ||
833 | memcpy(newsk, sk, sk->sk_prot->obj_size); | |
834 | ||
835 | /* SANITY */ | |
836 | sk_node_init(&newsk->sk_node); | |
837 | sock_lock_init(newsk); | |
838 | bh_lock_sock(newsk); | |
839 | ||
840 | atomic_set(&newsk->sk_rmem_alloc, 0); | |
841 | atomic_set(&newsk->sk_wmem_alloc, 0); | |
842 | atomic_set(&newsk->sk_omem_alloc, 0); | |
843 | skb_queue_head_init(&newsk->sk_receive_queue); | |
844 | skb_queue_head_init(&newsk->sk_write_queue); | |
97fc2f08 CL |
845 | #ifdef CONFIG_NET_DMA |
846 | skb_queue_head_init(&newsk->sk_async_wait_queue); | |
847 | #endif | |
87d11ceb ACM |
848 | |
849 | rwlock_init(&newsk->sk_dst_lock); | |
850 | rwlock_init(&newsk->sk_callback_lock); | |
851 | ||
852 | newsk->sk_dst_cache = NULL; | |
853 | newsk->sk_wmem_queued = 0; | |
854 | newsk->sk_forward_alloc = 0; | |
855 | newsk->sk_send_head = NULL; | |
856 | newsk->sk_backlog.head = newsk->sk_backlog.tail = NULL; | |
857 | newsk->sk_userlocks = sk->sk_userlocks & ~SOCK_BINDPORT_LOCK; | |
858 | ||
859 | sock_reset_flag(newsk, SOCK_DONE); | |
860 | skb_queue_head_init(&newsk->sk_error_queue); | |
861 | ||
862 | filter = newsk->sk_filter; | |
863 | if (filter != NULL) | |
864 | sk_filter_charge(newsk, filter); | |
865 | ||
866 | if (unlikely(xfrm_sk_clone_policy(newsk))) { | |
867 | /* It is still raw copy of parent, so invalidate | |
868 | * destructor and make plain sk_free() */ | |
869 | newsk->sk_destruct = NULL; | |
870 | sk_free(newsk); | |
871 | newsk = NULL; | |
872 | goto out; | |
873 | } | |
874 | ||
875 | newsk->sk_err = 0; | |
876 | newsk->sk_priority = 0; | |
877 | atomic_set(&newsk->sk_refcnt, 2); | |
878 | ||
879 | /* | |
880 | * Increment the counter in the same struct proto as the master | |
881 | * sock (sk_refcnt_debug_inc uses newsk->sk_prot->socks, that | |
882 | * is the same as sk->sk_prot->socks, as this field was copied | |
883 | * with memcpy). | |
884 | * | |
885 | * This _changes_ the previous behaviour, where | |
886 | * tcp_create_openreq_child always was incrementing the | |
887 | * equivalent to tcp_prot->socks (inet_sock_nr), so this have | |
888 | * to be taken into account in all callers. -acme | |
889 | */ | |
890 | sk_refcnt_debug_inc(newsk); | |
891 | newsk->sk_socket = NULL; | |
892 | newsk->sk_sleep = NULL; | |
893 | ||
894 | if (newsk->sk_prot->sockets_allocated) | |
895 | atomic_inc(newsk->sk_prot->sockets_allocated); | |
896 | } | |
897 | out: | |
898 | return newsk; | |
899 | } | |
900 | ||
901 | EXPORT_SYMBOL_GPL(sk_clone); | |
902 | ||
1da177e4 LT |
903 | void __init sk_init(void) |
904 | { | |
905 | if (num_physpages <= 4096) { | |
906 | sysctl_wmem_max = 32767; | |
907 | sysctl_rmem_max = 32767; | |
908 | sysctl_wmem_default = 32767; | |
909 | sysctl_rmem_default = 32767; | |
910 | } else if (num_physpages >= 131072) { | |
911 | sysctl_wmem_max = 131071; | |
912 | sysctl_rmem_max = 131071; | |
913 | } | |
914 | } | |
915 | ||
916 | /* | |
917 | * Simple resource managers for sockets. | |
918 | */ | |
919 | ||
920 | ||
921 | /* | |
922 | * Write buffer destructor automatically called from kfree_skb. | |
923 | */ | |
924 | void sock_wfree(struct sk_buff *skb) | |
925 | { | |
926 | struct sock *sk = skb->sk; | |
927 | ||
928 | /* In case it might be waiting for more memory. */ | |
929 | atomic_sub(skb->truesize, &sk->sk_wmem_alloc); | |
930 | if (!sock_flag(sk, SOCK_USE_WRITE_QUEUE)) | |
931 | sk->sk_write_space(sk); | |
932 | sock_put(sk); | |
933 | } | |
934 | ||
935 | /* | |
936 | * Read buffer destructor automatically called from kfree_skb. | |
937 | */ | |
938 | void sock_rfree(struct sk_buff *skb) | |
939 | { | |
940 | struct sock *sk = skb->sk; | |
941 | ||
942 | atomic_sub(skb->truesize, &sk->sk_rmem_alloc); | |
943 | } | |
944 | ||
945 | ||
946 | int sock_i_uid(struct sock *sk) | |
947 | { | |
948 | int uid; | |
949 | ||
950 | read_lock(&sk->sk_callback_lock); | |
951 | uid = sk->sk_socket ? SOCK_INODE(sk->sk_socket)->i_uid : 0; | |
952 | read_unlock(&sk->sk_callback_lock); | |
953 | return uid; | |
954 | } | |
955 | ||
956 | unsigned long sock_i_ino(struct sock *sk) | |
957 | { | |
958 | unsigned long ino; | |
959 | ||
960 | read_lock(&sk->sk_callback_lock); | |
961 | ino = sk->sk_socket ? SOCK_INODE(sk->sk_socket)->i_ino : 0; | |
962 | read_unlock(&sk->sk_callback_lock); | |
963 | return ino; | |
964 | } | |
965 | ||
966 | /* | |
967 | * Allocate a skb from the socket's send buffer. | |
968 | */ | |
86a76caf | 969 | struct sk_buff *sock_wmalloc(struct sock *sk, unsigned long size, int force, |
dd0fc66f | 970 | gfp_t priority) |
1da177e4 LT |
971 | { |
972 | if (force || atomic_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf) { | |
973 | struct sk_buff * skb = alloc_skb(size, priority); | |
974 | if (skb) { | |
975 | skb_set_owner_w(skb, sk); | |
976 | return skb; | |
977 | } | |
978 | } | |
979 | return NULL; | |
980 | } | |
981 | ||
982 | /* | |
983 | * Allocate a skb from the socket's receive buffer. | |
984 | */ | |
86a76caf | 985 | struct sk_buff *sock_rmalloc(struct sock *sk, unsigned long size, int force, |
dd0fc66f | 986 | gfp_t priority) |
1da177e4 LT |
987 | { |
988 | if (force || atomic_read(&sk->sk_rmem_alloc) < sk->sk_rcvbuf) { | |
989 | struct sk_buff *skb = alloc_skb(size, priority); | |
990 | if (skb) { | |
991 | skb_set_owner_r(skb, sk); | |
992 | return skb; | |
993 | } | |
994 | } | |
995 | return NULL; | |
996 | } | |
997 | ||
998 | /* | |
999 | * Allocate a memory block from the socket's option memory buffer. | |
1000 | */ | |
dd0fc66f | 1001 | void *sock_kmalloc(struct sock *sk, int size, gfp_t priority) |
1da177e4 LT |
1002 | { |
1003 | if ((unsigned)size <= sysctl_optmem_max && | |
1004 | atomic_read(&sk->sk_omem_alloc) + size < sysctl_optmem_max) { | |
1005 | void *mem; | |
1006 | /* First do the add, to avoid the race if kmalloc | |
1007 | * might sleep. | |
1008 | */ | |
1009 | atomic_add(size, &sk->sk_omem_alloc); | |
1010 | mem = kmalloc(size, priority); | |
1011 | if (mem) | |
1012 | return mem; | |
1013 | atomic_sub(size, &sk->sk_omem_alloc); | |
1014 | } | |
1015 | return NULL; | |
1016 | } | |
1017 | ||
1018 | /* | |
1019 | * Free an option memory block. | |
1020 | */ | |
1021 | void sock_kfree_s(struct sock *sk, void *mem, int size) | |
1022 | { | |
1023 | kfree(mem); | |
1024 | atomic_sub(size, &sk->sk_omem_alloc); | |
1025 | } | |
1026 | ||
1027 | /* It is almost wait_for_tcp_memory minus release_sock/lock_sock. | |
1028 | I think, these locks should be removed for datagram sockets. | |
1029 | */ | |
1030 | static long sock_wait_for_wmem(struct sock * sk, long timeo) | |
1031 | { | |
1032 | DEFINE_WAIT(wait); | |
1033 | ||
1034 | clear_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags); | |
1035 | for (;;) { | |
1036 | if (!timeo) | |
1037 | break; | |
1038 | if (signal_pending(current)) | |
1039 | break; | |
1040 | set_bit(SOCK_NOSPACE, &sk->sk_socket->flags); | |
1041 | prepare_to_wait(sk->sk_sleep, &wait, TASK_INTERRUPTIBLE); | |
1042 | if (atomic_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf) | |
1043 | break; | |
1044 | if (sk->sk_shutdown & SEND_SHUTDOWN) | |
1045 | break; | |
1046 | if (sk->sk_err) | |
1047 | break; | |
1048 | timeo = schedule_timeout(timeo); | |
1049 | } | |
1050 | finish_wait(sk->sk_sleep, &wait); | |
1051 | return timeo; | |
1052 | } | |
1053 | ||
1054 | ||
1055 | /* | |
1056 | * Generic send/receive buffer handlers | |
1057 | */ | |
1058 | ||
1059 | static struct sk_buff *sock_alloc_send_pskb(struct sock *sk, | |
1060 | unsigned long header_len, | |
1061 | unsigned long data_len, | |
1062 | int noblock, int *errcode) | |
1063 | { | |
1064 | struct sk_buff *skb; | |
7d877f3b | 1065 | gfp_t gfp_mask; |
1da177e4 LT |
1066 | long timeo; |
1067 | int err; | |
1068 | ||
1069 | gfp_mask = sk->sk_allocation; | |
1070 | if (gfp_mask & __GFP_WAIT) | |
1071 | gfp_mask |= __GFP_REPEAT; | |
1072 | ||
1073 | timeo = sock_sndtimeo(sk, noblock); | |
1074 | while (1) { | |
1075 | err = sock_error(sk); | |
1076 | if (err != 0) | |
1077 | goto failure; | |
1078 | ||
1079 | err = -EPIPE; | |
1080 | if (sk->sk_shutdown & SEND_SHUTDOWN) | |
1081 | goto failure; | |
1082 | ||
1083 | if (atomic_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf) { | |
1084 | skb = alloc_skb(header_len, sk->sk_allocation); | |
1085 | if (skb) { | |
1086 | int npages; | |
1087 | int i; | |
1088 | ||
1089 | /* No pages, we're done... */ | |
1090 | if (!data_len) | |
1091 | break; | |
1092 | ||
1093 | npages = (data_len + (PAGE_SIZE - 1)) >> PAGE_SHIFT; | |
1094 | skb->truesize += data_len; | |
1095 | skb_shinfo(skb)->nr_frags = npages; | |
1096 | for (i = 0; i < npages; i++) { | |
1097 | struct page *page; | |
1098 | skb_frag_t *frag; | |
1099 | ||
1100 | page = alloc_pages(sk->sk_allocation, 0); | |
1101 | if (!page) { | |
1102 | err = -ENOBUFS; | |
1103 | skb_shinfo(skb)->nr_frags = i; | |
1104 | kfree_skb(skb); | |
1105 | goto failure; | |
1106 | } | |
1107 | ||
1108 | frag = &skb_shinfo(skb)->frags[i]; | |
1109 | frag->page = page; | |
1110 | frag->page_offset = 0; | |
1111 | frag->size = (data_len >= PAGE_SIZE ? | |
1112 | PAGE_SIZE : | |
1113 | data_len); | |
1114 | data_len -= PAGE_SIZE; | |
1115 | } | |
1116 | ||
1117 | /* Full success... */ | |
1118 | break; | |
1119 | } | |
1120 | err = -ENOBUFS; | |
1121 | goto failure; | |
1122 | } | |
1123 | set_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags); | |
1124 | set_bit(SOCK_NOSPACE, &sk->sk_socket->flags); | |
1125 | err = -EAGAIN; | |
1126 | if (!timeo) | |
1127 | goto failure; | |
1128 | if (signal_pending(current)) | |
1129 | goto interrupted; | |
1130 | timeo = sock_wait_for_wmem(sk, timeo); | |
1131 | } | |
1132 | ||
1133 | skb_set_owner_w(skb, sk); | |
1134 | return skb; | |
1135 | ||
1136 | interrupted: | |
1137 | err = sock_intr_errno(timeo); | |
1138 | failure: | |
1139 | *errcode = err; | |
1140 | return NULL; | |
1141 | } | |
1142 | ||
1143 | struct sk_buff *sock_alloc_send_skb(struct sock *sk, unsigned long size, | |
1144 | int noblock, int *errcode) | |
1145 | { | |
1146 | return sock_alloc_send_pskb(sk, size, 0, noblock, errcode); | |
1147 | } | |
1148 | ||
1149 | static void __lock_sock(struct sock *sk) | |
1150 | { | |
1151 | DEFINE_WAIT(wait); | |
1152 | ||
1153 | for(;;) { | |
1154 | prepare_to_wait_exclusive(&sk->sk_lock.wq, &wait, | |
1155 | TASK_UNINTERRUPTIBLE); | |
1156 | spin_unlock_bh(&sk->sk_lock.slock); | |
1157 | schedule(); | |
1158 | spin_lock_bh(&sk->sk_lock.slock); | |
1159 | if(!sock_owned_by_user(sk)) | |
1160 | break; | |
1161 | } | |
1162 | finish_wait(&sk->sk_lock.wq, &wait); | |
1163 | } | |
1164 | ||
1165 | static void __release_sock(struct sock *sk) | |
1166 | { | |
1167 | struct sk_buff *skb = sk->sk_backlog.head; | |
1168 | ||
1169 | do { | |
1170 | sk->sk_backlog.head = sk->sk_backlog.tail = NULL; | |
1171 | bh_unlock_sock(sk); | |
1172 | ||
1173 | do { | |
1174 | struct sk_buff *next = skb->next; | |
1175 | ||
1176 | skb->next = NULL; | |
1177 | sk->sk_backlog_rcv(sk, skb); | |
1178 | ||
1179 | /* | |
1180 | * We are in process context here with softirqs | |
1181 | * disabled, use cond_resched_softirq() to preempt. | |
1182 | * This is safe to do because we've taken the backlog | |
1183 | * queue private: | |
1184 | */ | |
1185 | cond_resched_softirq(); | |
1186 | ||
1187 | skb = next; | |
1188 | } while (skb != NULL); | |
1189 | ||
1190 | bh_lock_sock(sk); | |
1191 | } while((skb = sk->sk_backlog.head) != NULL); | |
1192 | } | |
1193 | ||
1194 | /** | |
1195 | * sk_wait_data - wait for data to arrive at sk_receive_queue | |
4dc3b16b PP |
1196 | * @sk: sock to wait on |
1197 | * @timeo: for how long | |
1da177e4 LT |
1198 | * |
1199 | * Now socket state including sk->sk_err is changed only under lock, | |
1200 | * hence we may omit checks after joining wait queue. | |
1201 | * We check receive queue before schedule() only as optimization; | |
1202 | * it is very likely that release_sock() added new data. | |
1203 | */ | |
1204 | int sk_wait_data(struct sock *sk, long *timeo) | |
1205 | { | |
1206 | int rc; | |
1207 | DEFINE_WAIT(wait); | |
1208 | ||
1209 | prepare_to_wait(sk->sk_sleep, &wait, TASK_INTERRUPTIBLE); | |
1210 | set_bit(SOCK_ASYNC_WAITDATA, &sk->sk_socket->flags); | |
1211 | rc = sk_wait_event(sk, timeo, !skb_queue_empty(&sk->sk_receive_queue)); | |
1212 | clear_bit(SOCK_ASYNC_WAITDATA, &sk->sk_socket->flags); | |
1213 | finish_wait(sk->sk_sleep, &wait); | |
1214 | return rc; | |
1215 | } | |
1216 | ||
1217 | EXPORT_SYMBOL(sk_wait_data); | |
1218 | ||
1219 | /* | |
1220 | * Set of default routines for initialising struct proto_ops when | |
1221 | * the protocol does not support a particular function. In certain | |
1222 | * cases where it makes no sense for a protocol to have a "do nothing" | |
1223 | * function, some default processing is provided. | |
1224 | */ | |
1225 | ||
1226 | int sock_no_bind(struct socket *sock, struct sockaddr *saddr, int len) | |
1227 | { | |
1228 | return -EOPNOTSUPP; | |
1229 | } | |
1230 | ||
1231 | int sock_no_connect(struct socket *sock, struct sockaddr *saddr, | |
1232 | int len, int flags) | |
1233 | { | |
1234 | return -EOPNOTSUPP; | |
1235 | } | |
1236 | ||
1237 | int sock_no_socketpair(struct socket *sock1, struct socket *sock2) | |
1238 | { | |
1239 | return -EOPNOTSUPP; | |
1240 | } | |
1241 | ||
1242 | int sock_no_accept(struct socket *sock, struct socket *newsock, int flags) | |
1243 | { | |
1244 | return -EOPNOTSUPP; | |
1245 | } | |
1246 | ||
1247 | int sock_no_getname(struct socket *sock, struct sockaddr *saddr, | |
1248 | int *len, int peer) | |
1249 | { | |
1250 | return -EOPNOTSUPP; | |
1251 | } | |
1252 | ||
1253 | unsigned int sock_no_poll(struct file * file, struct socket *sock, poll_table *pt) | |
1254 | { | |
1255 | return 0; | |
1256 | } | |
1257 | ||
1258 | int sock_no_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg) | |
1259 | { | |
1260 | return -EOPNOTSUPP; | |
1261 | } | |
1262 | ||
1263 | int sock_no_listen(struct socket *sock, int backlog) | |
1264 | { | |
1265 | return -EOPNOTSUPP; | |
1266 | } | |
1267 | ||
1268 | int sock_no_shutdown(struct socket *sock, int how) | |
1269 | { | |
1270 | return -EOPNOTSUPP; | |
1271 | } | |
1272 | ||
1273 | int sock_no_setsockopt(struct socket *sock, int level, int optname, | |
1274 | char __user *optval, int optlen) | |
1275 | { | |
1276 | return -EOPNOTSUPP; | |
1277 | } | |
1278 | ||
1279 | int sock_no_getsockopt(struct socket *sock, int level, int optname, | |
1280 | char __user *optval, int __user *optlen) | |
1281 | { | |
1282 | return -EOPNOTSUPP; | |
1283 | } | |
1284 | ||
1285 | int sock_no_sendmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *m, | |
1286 | size_t len) | |
1287 | { | |
1288 | return -EOPNOTSUPP; | |
1289 | } | |
1290 | ||
1291 | int sock_no_recvmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *m, | |
1292 | size_t len, int flags) | |
1293 | { | |
1294 | return -EOPNOTSUPP; | |
1295 | } | |
1296 | ||
1297 | int sock_no_mmap(struct file *file, struct socket *sock, struct vm_area_struct *vma) | |
1298 | { | |
1299 | /* Mirror missing mmap method error code */ | |
1300 | return -ENODEV; | |
1301 | } | |
1302 | ||
1303 | ssize_t sock_no_sendpage(struct socket *sock, struct page *page, int offset, size_t size, int flags) | |
1304 | { | |
1305 | ssize_t res; | |
1306 | struct msghdr msg = {.msg_flags = flags}; | |
1307 | struct kvec iov; | |
1308 | char *kaddr = kmap(page); | |
1309 | iov.iov_base = kaddr + offset; | |
1310 | iov.iov_len = size; | |
1311 | res = kernel_sendmsg(sock, &msg, &iov, 1, size); | |
1312 | kunmap(page); | |
1313 | return res; | |
1314 | } | |
1315 | ||
1316 | /* | |
1317 | * Default Socket Callbacks | |
1318 | */ | |
1319 | ||
1320 | static void sock_def_wakeup(struct sock *sk) | |
1321 | { | |
1322 | read_lock(&sk->sk_callback_lock); | |
1323 | if (sk->sk_sleep && waitqueue_active(sk->sk_sleep)) | |
1324 | wake_up_interruptible_all(sk->sk_sleep); | |
1325 | read_unlock(&sk->sk_callback_lock); | |
1326 | } | |
1327 | ||
1328 | static void sock_def_error_report(struct sock *sk) | |
1329 | { | |
1330 | read_lock(&sk->sk_callback_lock); | |
1331 | if (sk->sk_sleep && waitqueue_active(sk->sk_sleep)) | |
1332 | wake_up_interruptible(sk->sk_sleep); | |
1333 | sk_wake_async(sk,0,POLL_ERR); | |
1334 | read_unlock(&sk->sk_callback_lock); | |
1335 | } | |
1336 | ||
1337 | static void sock_def_readable(struct sock *sk, int len) | |
1338 | { | |
1339 | read_lock(&sk->sk_callback_lock); | |
1340 | if (sk->sk_sleep && waitqueue_active(sk->sk_sleep)) | |
1341 | wake_up_interruptible(sk->sk_sleep); | |
1342 | sk_wake_async(sk,1,POLL_IN); | |
1343 | read_unlock(&sk->sk_callback_lock); | |
1344 | } | |
1345 | ||
1346 | static void sock_def_write_space(struct sock *sk) | |
1347 | { | |
1348 | read_lock(&sk->sk_callback_lock); | |
1349 | ||
1350 | /* Do not wake up a writer until he can make "significant" | |
1351 | * progress. --DaveM | |
1352 | */ | |
1353 | if((atomic_read(&sk->sk_wmem_alloc) << 1) <= sk->sk_sndbuf) { | |
1354 | if (sk->sk_sleep && waitqueue_active(sk->sk_sleep)) | |
1355 | wake_up_interruptible(sk->sk_sleep); | |
1356 | ||
1357 | /* Should agree with poll, otherwise some programs break */ | |
1358 | if (sock_writeable(sk)) | |
1359 | sk_wake_async(sk, 2, POLL_OUT); | |
1360 | } | |
1361 | ||
1362 | read_unlock(&sk->sk_callback_lock); | |
1363 | } | |
1364 | ||
1365 | static void sock_def_destruct(struct sock *sk) | |
1366 | { | |
a51482bd | 1367 | kfree(sk->sk_protinfo); |
1da177e4 LT |
1368 | } |
1369 | ||
1370 | void sk_send_sigurg(struct sock *sk) | |
1371 | { | |
1372 | if (sk->sk_socket && sk->sk_socket->file) | |
1373 | if (send_sigurg(&sk->sk_socket->file->f_owner)) | |
1374 | sk_wake_async(sk, 3, POLL_PRI); | |
1375 | } | |
1376 | ||
1377 | void sk_reset_timer(struct sock *sk, struct timer_list* timer, | |
1378 | unsigned long expires) | |
1379 | { | |
1380 | if (!mod_timer(timer, expires)) | |
1381 | sock_hold(sk); | |
1382 | } | |
1383 | ||
1384 | EXPORT_SYMBOL(sk_reset_timer); | |
1385 | ||
1386 | void sk_stop_timer(struct sock *sk, struct timer_list* timer) | |
1387 | { | |
1388 | if (timer_pending(timer) && del_timer(timer)) | |
1389 | __sock_put(sk); | |
1390 | } | |
1391 | ||
1392 | EXPORT_SYMBOL(sk_stop_timer); | |
1393 | ||
1394 | void sock_init_data(struct socket *sock, struct sock *sk) | |
1395 | { | |
1396 | skb_queue_head_init(&sk->sk_receive_queue); | |
1397 | skb_queue_head_init(&sk->sk_write_queue); | |
1398 | skb_queue_head_init(&sk->sk_error_queue); | |
97fc2f08 CL |
1399 | #ifdef CONFIG_NET_DMA |
1400 | skb_queue_head_init(&sk->sk_async_wait_queue); | |
1401 | #endif | |
1da177e4 LT |
1402 | |
1403 | sk->sk_send_head = NULL; | |
1404 | ||
1405 | init_timer(&sk->sk_timer); | |
1406 | ||
1407 | sk->sk_allocation = GFP_KERNEL; | |
1408 | sk->sk_rcvbuf = sysctl_rmem_default; | |
1409 | sk->sk_sndbuf = sysctl_wmem_default; | |
1410 | sk->sk_state = TCP_CLOSE; | |
1411 | sk->sk_socket = sock; | |
1412 | ||
1413 | sock_set_flag(sk, SOCK_ZAPPED); | |
1414 | ||
1415 | if(sock) | |
1416 | { | |
1417 | sk->sk_type = sock->type; | |
1418 | sk->sk_sleep = &sock->wait; | |
1419 | sock->sk = sk; | |
1420 | } else | |
1421 | sk->sk_sleep = NULL; | |
1422 | ||
1423 | rwlock_init(&sk->sk_dst_lock); | |
1424 | rwlock_init(&sk->sk_callback_lock); | |
1425 | ||
1426 | sk->sk_state_change = sock_def_wakeup; | |
1427 | sk->sk_data_ready = sock_def_readable; | |
1428 | sk->sk_write_space = sock_def_write_space; | |
1429 | sk->sk_error_report = sock_def_error_report; | |
1430 | sk->sk_destruct = sock_def_destruct; | |
1431 | ||
1432 | sk->sk_sndmsg_page = NULL; | |
1433 | sk->sk_sndmsg_off = 0; | |
1434 | ||
1435 | sk->sk_peercred.pid = 0; | |
1436 | sk->sk_peercred.uid = -1; | |
1437 | sk->sk_peercred.gid = -1; | |
1438 | sk->sk_write_pending = 0; | |
1439 | sk->sk_rcvlowat = 1; | |
1440 | sk->sk_rcvtimeo = MAX_SCHEDULE_TIMEOUT; | |
1441 | sk->sk_sndtimeo = MAX_SCHEDULE_TIMEOUT; | |
1442 | ||
1443 | sk->sk_stamp.tv_sec = -1L; | |
1444 | sk->sk_stamp.tv_usec = -1L; | |
1445 | ||
1446 | atomic_set(&sk->sk_refcnt, 1); | |
1447 | } | |
1448 | ||
1449 | void fastcall lock_sock(struct sock *sk) | |
1450 | { | |
1451 | might_sleep(); | |
1452 | spin_lock_bh(&(sk->sk_lock.slock)); | |
1453 | if (sk->sk_lock.owner) | |
1454 | __lock_sock(sk); | |
1455 | sk->sk_lock.owner = (void *)1; | |
1456 | spin_unlock_bh(&(sk->sk_lock.slock)); | |
1457 | } | |
1458 | ||
1459 | EXPORT_SYMBOL(lock_sock); | |
1460 | ||
1461 | void fastcall release_sock(struct sock *sk) | |
1462 | { | |
1463 | spin_lock_bh(&(sk->sk_lock.slock)); | |
1464 | if (sk->sk_backlog.tail) | |
1465 | __release_sock(sk); | |
1466 | sk->sk_lock.owner = NULL; | |
1467 | if (waitqueue_active(&(sk->sk_lock.wq))) | |
1468 | wake_up(&(sk->sk_lock.wq)); | |
1469 | spin_unlock_bh(&(sk->sk_lock.slock)); | |
1470 | } | |
1471 | EXPORT_SYMBOL(release_sock); | |
1472 | ||
1473 | int sock_get_timestamp(struct sock *sk, struct timeval __user *userstamp) | |
1474 | { | |
1475 | if (!sock_flag(sk, SOCK_TIMESTAMP)) | |
1476 | sock_enable_timestamp(sk); | |
1477 | if (sk->sk_stamp.tv_sec == -1) | |
1478 | return -ENOENT; | |
1479 | if (sk->sk_stamp.tv_sec == 0) | |
1480 | do_gettimeofday(&sk->sk_stamp); | |
1481 | return copy_to_user(userstamp, &sk->sk_stamp, sizeof(struct timeval)) ? | |
1482 | -EFAULT : 0; | |
1483 | } | |
1484 | EXPORT_SYMBOL(sock_get_timestamp); | |
1485 | ||
1486 | void sock_enable_timestamp(struct sock *sk) | |
1487 | { | |
1488 | if (!sock_flag(sk, SOCK_TIMESTAMP)) { | |
1489 | sock_set_flag(sk, SOCK_TIMESTAMP); | |
1490 | net_enable_timestamp(); | |
1491 | } | |
1492 | } | |
1493 | EXPORT_SYMBOL(sock_enable_timestamp); | |
1494 | ||
1495 | /* | |
1496 | * Get a socket option on an socket. | |
1497 | * | |
1498 | * FIX: POSIX 1003.1g is very ambiguous here. It states that | |
1499 | * asynchronous errors should be reported by getsockopt. We assume | |
1500 | * this means if you specify SO_ERROR (otherwise whats the point of it). | |
1501 | */ | |
1502 | int sock_common_getsockopt(struct socket *sock, int level, int optname, | |
1503 | char __user *optval, int __user *optlen) | |
1504 | { | |
1505 | struct sock *sk = sock->sk; | |
1506 | ||
1507 | return sk->sk_prot->getsockopt(sk, level, optname, optval, optlen); | |
1508 | } | |
1509 | ||
1510 | EXPORT_SYMBOL(sock_common_getsockopt); | |
1511 | ||
3fdadf7d | 1512 | #ifdef CONFIG_COMPAT |
543d9cfe ACM |
1513 | int compat_sock_common_getsockopt(struct socket *sock, int level, int optname, |
1514 | char __user *optval, int __user *optlen) | |
3fdadf7d DM |
1515 | { |
1516 | struct sock *sk = sock->sk; | |
1517 | ||
543d9cfe ACM |
1518 | if (sk->sk_prot->compat_setsockopt != NULL) |
1519 | return sk->sk_prot->compat_getsockopt(sk, level, optname, | |
1520 | optval, optlen); | |
3fdadf7d DM |
1521 | return sk->sk_prot->getsockopt(sk, level, optname, optval, optlen); |
1522 | } | |
1523 | EXPORT_SYMBOL(compat_sock_common_getsockopt); | |
1524 | #endif | |
1525 | ||
1da177e4 LT |
1526 | int sock_common_recvmsg(struct kiocb *iocb, struct socket *sock, |
1527 | struct msghdr *msg, size_t size, int flags) | |
1528 | { | |
1529 | struct sock *sk = sock->sk; | |
1530 | int addr_len = 0; | |
1531 | int err; | |
1532 | ||
1533 | err = sk->sk_prot->recvmsg(iocb, sk, msg, size, flags & MSG_DONTWAIT, | |
1534 | flags & ~MSG_DONTWAIT, &addr_len); | |
1535 | if (err >= 0) | |
1536 | msg->msg_namelen = addr_len; | |
1537 | return err; | |
1538 | } | |
1539 | ||
1540 | EXPORT_SYMBOL(sock_common_recvmsg); | |
1541 | ||
1542 | /* | |
1543 | * Set socket options on an inet socket. | |
1544 | */ | |
1545 | int sock_common_setsockopt(struct socket *sock, int level, int optname, | |
1546 | char __user *optval, int optlen) | |
1547 | { | |
1548 | struct sock *sk = sock->sk; | |
1549 | ||
1550 | return sk->sk_prot->setsockopt(sk, level, optname, optval, optlen); | |
1551 | } | |
1552 | ||
1553 | EXPORT_SYMBOL(sock_common_setsockopt); | |
1554 | ||
3fdadf7d | 1555 | #ifdef CONFIG_COMPAT |
543d9cfe ACM |
1556 | int compat_sock_common_setsockopt(struct socket *sock, int level, int optname, |
1557 | char __user *optval, int optlen) | |
3fdadf7d DM |
1558 | { |
1559 | struct sock *sk = sock->sk; | |
1560 | ||
543d9cfe ACM |
1561 | if (sk->sk_prot->compat_setsockopt != NULL) |
1562 | return sk->sk_prot->compat_setsockopt(sk, level, optname, | |
1563 | optval, optlen); | |
3fdadf7d DM |
1564 | return sk->sk_prot->setsockopt(sk, level, optname, optval, optlen); |
1565 | } | |
1566 | EXPORT_SYMBOL(compat_sock_common_setsockopt); | |
1567 | #endif | |
1568 | ||
1da177e4 LT |
1569 | void sk_common_release(struct sock *sk) |
1570 | { | |
1571 | if (sk->sk_prot->destroy) | |
1572 | sk->sk_prot->destroy(sk); | |
1573 | ||
1574 | /* | |
1575 | * Observation: when sock_common_release is called, processes have | |
1576 | * no access to socket. But net still has. | |
1577 | * Step one, detach it from networking: | |
1578 | * | |
1579 | * A. Remove from hash tables. | |
1580 | */ | |
1581 | ||
1582 | sk->sk_prot->unhash(sk); | |
1583 | ||
1584 | /* | |
1585 | * In this point socket cannot receive new packets, but it is possible | |
1586 | * that some packets are in flight because some CPU runs receiver and | |
1587 | * did hash table lookup before we unhashed socket. They will achieve | |
1588 | * receive queue and will be purged by socket destructor. | |
1589 | * | |
1590 | * Also we still have packets pending on receive queue and probably, | |
1591 | * our own packets waiting in device queues. sock_destroy will drain | |
1592 | * receive queue, but transmitted packets will delay socket destruction | |
1593 | * until the last reference will be released. | |
1594 | */ | |
1595 | ||
1596 | sock_orphan(sk); | |
1597 | ||
1598 | xfrm_sk_free_policy(sk); | |
1599 | ||
e6848976 | 1600 | sk_refcnt_debug_release(sk); |
1da177e4 LT |
1601 | sock_put(sk); |
1602 | } | |
1603 | ||
1604 | EXPORT_SYMBOL(sk_common_release); | |
1605 | ||
1606 | static DEFINE_RWLOCK(proto_list_lock); | |
1607 | static LIST_HEAD(proto_list); | |
1608 | ||
1609 | int proto_register(struct proto *prot, int alloc_slab) | |
1610 | { | |
8feaf0c0 ACM |
1611 | char *request_sock_slab_name = NULL; |
1612 | char *timewait_sock_slab_name; | |
1da177e4 LT |
1613 | int rc = -ENOBUFS; |
1614 | ||
1da177e4 LT |
1615 | if (alloc_slab) { |
1616 | prot->slab = kmem_cache_create(prot->name, prot->obj_size, 0, | |
1617 | SLAB_HWCACHE_ALIGN, NULL, NULL); | |
1618 | ||
1619 | if (prot->slab == NULL) { | |
1620 | printk(KERN_CRIT "%s: Can't create sock SLAB cache!\n", | |
1621 | prot->name); | |
2a278051 | 1622 | goto out; |
1da177e4 | 1623 | } |
2e6599cb ACM |
1624 | |
1625 | if (prot->rsk_prot != NULL) { | |
1626 | static const char mask[] = "request_sock_%s"; | |
1627 | ||
1628 | request_sock_slab_name = kmalloc(strlen(prot->name) + sizeof(mask) - 1, GFP_KERNEL); | |
1629 | if (request_sock_slab_name == NULL) | |
1630 | goto out_free_sock_slab; | |
1631 | ||
1632 | sprintf(request_sock_slab_name, mask, prot->name); | |
1633 | prot->rsk_prot->slab = kmem_cache_create(request_sock_slab_name, | |
1634 | prot->rsk_prot->obj_size, 0, | |
1635 | SLAB_HWCACHE_ALIGN, NULL, NULL); | |
1636 | ||
1637 | if (prot->rsk_prot->slab == NULL) { | |
1638 | printk(KERN_CRIT "%s: Can't create request sock SLAB cache!\n", | |
1639 | prot->name); | |
1640 | goto out_free_request_sock_slab_name; | |
1641 | } | |
1642 | } | |
8feaf0c0 | 1643 | |
6d6ee43e | 1644 | if (prot->twsk_prot != NULL) { |
8feaf0c0 ACM |
1645 | static const char mask[] = "tw_sock_%s"; |
1646 | ||
1647 | timewait_sock_slab_name = kmalloc(strlen(prot->name) + sizeof(mask) - 1, GFP_KERNEL); | |
1648 | ||
1649 | if (timewait_sock_slab_name == NULL) | |
1650 | goto out_free_request_sock_slab; | |
1651 | ||
1652 | sprintf(timewait_sock_slab_name, mask, prot->name); | |
6d6ee43e ACM |
1653 | prot->twsk_prot->twsk_slab = |
1654 | kmem_cache_create(timewait_sock_slab_name, | |
1655 | prot->twsk_prot->twsk_obj_size, | |
1656 | 0, SLAB_HWCACHE_ALIGN, | |
1657 | NULL, NULL); | |
1658 | if (prot->twsk_prot->twsk_slab == NULL) | |
8feaf0c0 ACM |
1659 | goto out_free_timewait_sock_slab_name; |
1660 | } | |
1da177e4 LT |
1661 | } |
1662 | ||
2a278051 | 1663 | write_lock(&proto_list_lock); |
1da177e4 | 1664 | list_add(&prot->node, &proto_list); |
1da177e4 | 1665 | write_unlock(&proto_list_lock); |
2a278051 ACM |
1666 | rc = 0; |
1667 | out: | |
1da177e4 | 1668 | return rc; |
8feaf0c0 ACM |
1669 | out_free_timewait_sock_slab_name: |
1670 | kfree(timewait_sock_slab_name); | |
1671 | out_free_request_sock_slab: | |
1672 | if (prot->rsk_prot && prot->rsk_prot->slab) { | |
1673 | kmem_cache_destroy(prot->rsk_prot->slab); | |
1674 | prot->rsk_prot->slab = NULL; | |
1675 | } | |
2e6599cb ACM |
1676 | out_free_request_sock_slab_name: |
1677 | kfree(request_sock_slab_name); | |
1678 | out_free_sock_slab: | |
1679 | kmem_cache_destroy(prot->slab); | |
1680 | prot->slab = NULL; | |
1681 | goto out; | |
1da177e4 LT |
1682 | } |
1683 | ||
1684 | EXPORT_SYMBOL(proto_register); | |
1685 | ||
1686 | void proto_unregister(struct proto *prot) | |
1687 | { | |
1688 | write_lock(&proto_list_lock); | |
0a3f4358 PM |
1689 | list_del(&prot->node); |
1690 | write_unlock(&proto_list_lock); | |
1da177e4 LT |
1691 | |
1692 | if (prot->slab != NULL) { | |
1693 | kmem_cache_destroy(prot->slab); | |
1694 | prot->slab = NULL; | |
1695 | } | |
1696 | ||
2e6599cb ACM |
1697 | if (prot->rsk_prot != NULL && prot->rsk_prot->slab != NULL) { |
1698 | const char *name = kmem_cache_name(prot->rsk_prot->slab); | |
1699 | ||
1700 | kmem_cache_destroy(prot->rsk_prot->slab); | |
1701 | kfree(name); | |
1702 | prot->rsk_prot->slab = NULL; | |
1703 | } | |
1704 | ||
6d6ee43e ACM |
1705 | if (prot->twsk_prot != NULL && prot->twsk_prot->twsk_slab != NULL) { |
1706 | const char *name = kmem_cache_name(prot->twsk_prot->twsk_slab); | |
8feaf0c0 | 1707 | |
6d6ee43e | 1708 | kmem_cache_destroy(prot->twsk_prot->twsk_slab); |
8feaf0c0 | 1709 | kfree(name); |
6d6ee43e | 1710 | prot->twsk_prot->twsk_slab = NULL; |
8feaf0c0 | 1711 | } |
1da177e4 LT |
1712 | } |
1713 | ||
1714 | EXPORT_SYMBOL(proto_unregister); | |
1715 | ||
1716 | #ifdef CONFIG_PROC_FS | |
1717 | static inline struct proto *__proto_head(void) | |
1718 | { | |
1719 | return list_entry(proto_list.next, struct proto, node); | |
1720 | } | |
1721 | ||
1722 | static inline struct proto *proto_head(void) | |
1723 | { | |
1724 | return list_empty(&proto_list) ? NULL : __proto_head(); | |
1725 | } | |
1726 | ||
1727 | static inline struct proto *proto_next(struct proto *proto) | |
1728 | { | |
1729 | return proto->node.next == &proto_list ? NULL : | |
1730 | list_entry(proto->node.next, struct proto, node); | |
1731 | } | |
1732 | ||
1733 | static inline struct proto *proto_get_idx(loff_t pos) | |
1734 | { | |
1735 | struct proto *proto; | |
1736 | loff_t i = 0; | |
1737 | ||
1738 | list_for_each_entry(proto, &proto_list, node) | |
1739 | if (i++ == pos) | |
1740 | goto out; | |
1741 | ||
1742 | proto = NULL; | |
1743 | out: | |
1744 | return proto; | |
1745 | } | |
1746 | ||
1747 | static void *proto_seq_start(struct seq_file *seq, loff_t *pos) | |
1748 | { | |
1749 | read_lock(&proto_list_lock); | |
1750 | return *pos ? proto_get_idx(*pos - 1) : SEQ_START_TOKEN; | |
1751 | } | |
1752 | ||
1753 | static void *proto_seq_next(struct seq_file *seq, void *v, loff_t *pos) | |
1754 | { | |
1755 | ++*pos; | |
1756 | return v == SEQ_START_TOKEN ? proto_head() : proto_next(v); | |
1757 | } | |
1758 | ||
1759 | static void proto_seq_stop(struct seq_file *seq, void *v) | |
1760 | { | |
1761 | read_unlock(&proto_list_lock); | |
1762 | } | |
1763 | ||
1764 | static char proto_method_implemented(const void *method) | |
1765 | { | |
1766 | return method == NULL ? 'n' : 'y'; | |
1767 | } | |
1768 | ||
1769 | static void proto_seq_printf(struct seq_file *seq, struct proto *proto) | |
1770 | { | |
1771 | seq_printf(seq, "%-9s %4u %6d %6d %-3s %6u %-3s %-10s " | |
1772 | "%2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c\n", | |
1773 | proto->name, | |
1774 | proto->obj_size, | |
1775 | proto->sockets_allocated != NULL ? atomic_read(proto->sockets_allocated) : -1, | |
1776 | proto->memory_allocated != NULL ? atomic_read(proto->memory_allocated) : -1, | |
1777 | proto->memory_pressure != NULL ? *proto->memory_pressure ? "yes" : "no" : "NI", | |
1778 | proto->max_header, | |
1779 | proto->slab == NULL ? "no" : "yes", | |
1780 | module_name(proto->owner), | |
1781 | proto_method_implemented(proto->close), | |
1782 | proto_method_implemented(proto->connect), | |
1783 | proto_method_implemented(proto->disconnect), | |
1784 | proto_method_implemented(proto->accept), | |
1785 | proto_method_implemented(proto->ioctl), | |
1786 | proto_method_implemented(proto->init), | |
1787 | proto_method_implemented(proto->destroy), | |
1788 | proto_method_implemented(proto->shutdown), | |
1789 | proto_method_implemented(proto->setsockopt), | |
1790 | proto_method_implemented(proto->getsockopt), | |
1791 | proto_method_implemented(proto->sendmsg), | |
1792 | proto_method_implemented(proto->recvmsg), | |
1793 | proto_method_implemented(proto->sendpage), | |
1794 | proto_method_implemented(proto->bind), | |
1795 | proto_method_implemented(proto->backlog_rcv), | |
1796 | proto_method_implemented(proto->hash), | |
1797 | proto_method_implemented(proto->unhash), | |
1798 | proto_method_implemented(proto->get_port), | |
1799 | proto_method_implemented(proto->enter_memory_pressure)); | |
1800 | } | |
1801 | ||
1802 | static int proto_seq_show(struct seq_file *seq, void *v) | |
1803 | { | |
1804 | if (v == SEQ_START_TOKEN) | |
1805 | seq_printf(seq, "%-9s %-4s %-8s %-6s %-5s %-7s %-4s %-10s %s", | |
1806 | "protocol", | |
1807 | "size", | |
1808 | "sockets", | |
1809 | "memory", | |
1810 | "press", | |
1811 | "maxhdr", | |
1812 | "slab", | |
1813 | "module", | |
1814 | "cl co di ac io in de sh ss gs se re sp bi br ha uh gp em\n"); | |
1815 | else | |
1816 | proto_seq_printf(seq, v); | |
1817 | return 0; | |
1818 | } | |
1819 | ||
1820 | static struct seq_operations proto_seq_ops = { | |
1821 | .start = proto_seq_start, | |
1822 | .next = proto_seq_next, | |
1823 | .stop = proto_seq_stop, | |
1824 | .show = proto_seq_show, | |
1825 | }; | |
1826 | ||
1827 | static int proto_seq_open(struct inode *inode, struct file *file) | |
1828 | { | |
1829 | return seq_open(file, &proto_seq_ops); | |
1830 | } | |
1831 | ||
1832 | static struct file_operations proto_seq_fops = { | |
1833 | .owner = THIS_MODULE, | |
1834 | .open = proto_seq_open, | |
1835 | .read = seq_read, | |
1836 | .llseek = seq_lseek, | |
1837 | .release = seq_release, | |
1838 | }; | |
1839 | ||
1840 | static int __init proto_init(void) | |
1841 | { | |
1842 | /* register /proc/net/protocols */ | |
1843 | return proc_net_fops_create("protocols", S_IRUGO, &proto_seq_fops) == NULL ? -ENOBUFS : 0; | |
1844 | } | |
1845 | ||
1846 | subsys_initcall(proto_init); | |
1847 | ||
1848 | #endif /* PROC_FS */ | |
1849 | ||
1850 | EXPORT_SYMBOL(sk_alloc); | |
1851 | EXPORT_SYMBOL(sk_free); | |
1852 | EXPORT_SYMBOL(sk_send_sigurg); | |
1853 | EXPORT_SYMBOL(sock_alloc_send_skb); | |
1854 | EXPORT_SYMBOL(sock_init_data); | |
1855 | EXPORT_SYMBOL(sock_kfree_s); | |
1856 | EXPORT_SYMBOL(sock_kmalloc); | |
1857 | EXPORT_SYMBOL(sock_no_accept); | |
1858 | EXPORT_SYMBOL(sock_no_bind); | |
1859 | EXPORT_SYMBOL(sock_no_connect); | |
1860 | EXPORT_SYMBOL(sock_no_getname); | |
1861 | EXPORT_SYMBOL(sock_no_getsockopt); | |
1862 | EXPORT_SYMBOL(sock_no_ioctl); | |
1863 | EXPORT_SYMBOL(sock_no_listen); | |
1864 | EXPORT_SYMBOL(sock_no_mmap); | |
1865 | EXPORT_SYMBOL(sock_no_poll); | |
1866 | EXPORT_SYMBOL(sock_no_recvmsg); | |
1867 | EXPORT_SYMBOL(sock_no_sendmsg); | |
1868 | EXPORT_SYMBOL(sock_no_sendpage); | |
1869 | EXPORT_SYMBOL(sock_no_setsockopt); | |
1870 | EXPORT_SYMBOL(sock_no_shutdown); | |
1871 | EXPORT_SYMBOL(sock_no_socketpair); | |
1872 | EXPORT_SYMBOL(sock_rfree); | |
1873 | EXPORT_SYMBOL(sock_setsockopt); | |
1874 | EXPORT_SYMBOL(sock_wfree); | |
1875 | EXPORT_SYMBOL(sock_wmalloc); | |
1876 | EXPORT_SYMBOL(sock_i_uid); | |
1877 | EXPORT_SYMBOL(sock_i_ino); | |
1da177e4 | 1878 | EXPORT_SYMBOL(sysctl_optmem_max); |
6baf1f41 | 1879 | #ifdef CONFIG_SYSCTL |
1da177e4 LT |
1880 | EXPORT_SYMBOL(sysctl_rmem_max); |
1881 | EXPORT_SYMBOL(sysctl_wmem_max); | |
1882 | #endif |