Commit | Line | Data |
---|---|---|
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 | |
4ec93edb | 37 | * code. The ACK stuff can wait and needs major |
1da177e4 LT |
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> | |
a1f8e7f7 | 114 | #include <linux/highmem.h> |
1da177e4 LT |
115 | |
116 | #include <asm/uaccess.h> | |
117 | #include <asm/system.h> | |
118 | ||
119 | #include <linux/netdevice.h> | |
120 | #include <net/protocol.h> | |
121 | #include <linux/skbuff.h> | |
2e6599cb | 122 | #include <net/request_sock.h> |
1da177e4 LT |
123 | #include <net/sock.h> |
124 | #include <net/xfrm.h> | |
125 | #include <linux/ipsec.h> | |
126 | ||
127 | #include <linux/filter.h> | |
128 | ||
129 | #ifdef CONFIG_INET | |
130 | #include <net/tcp.h> | |
131 | #endif | |
132 | ||
da21f24d IM |
133 | /* |
134 | * Each address family might have different locking rules, so we have | |
135 | * one slock key per address family: | |
136 | */ | |
a5b5bb9a IM |
137 | static struct lock_class_key af_family_keys[AF_MAX]; |
138 | static struct lock_class_key af_family_slock_keys[AF_MAX]; | |
139 | ||
140 | #ifdef CONFIG_DEBUG_LOCK_ALLOC | |
141 | /* | |
142 | * Make lock validator output more readable. (we pre-construct these | |
143 | * strings build-time, so that runtime initialization of socket | |
144 | * locks is fast): | |
145 | */ | |
146 | static const char *af_family_key_strings[AF_MAX+1] = { | |
147 | "sk_lock-AF_UNSPEC", "sk_lock-AF_UNIX" , "sk_lock-AF_INET" , | |
148 | "sk_lock-AF_AX25" , "sk_lock-AF_IPX" , "sk_lock-AF_APPLETALK", | |
149 | "sk_lock-AF_NETROM", "sk_lock-AF_BRIDGE" , "sk_lock-AF_ATMPVC" , | |
150 | "sk_lock-AF_X25" , "sk_lock-AF_INET6" , "sk_lock-AF_ROSE" , | |
151 | "sk_lock-AF_DECnet", "sk_lock-AF_NETBEUI" , "sk_lock-AF_SECURITY" , | |
152 | "sk_lock-AF_KEY" , "sk_lock-AF_NETLINK" , "sk_lock-AF_PACKET" , | |
153 | "sk_lock-AF_ASH" , "sk_lock-AF_ECONET" , "sk_lock-AF_ATMSVC" , | |
154 | "sk_lock-21" , "sk_lock-AF_SNA" , "sk_lock-AF_IRDA" , | |
155 | "sk_lock-AF_PPPOX" , "sk_lock-AF_WANPIPE" , "sk_lock-AF_LLC" , | |
156 | "sk_lock-27" , "sk_lock-28" , "sk_lock-29" , | |
17926a79 DH |
157 | "sk_lock-AF_TIPC" , "sk_lock-AF_BLUETOOTH", "sk_lock-IUCV" , |
158 | "sk_lock-AF_RXRPC" , "sk_lock-AF_MAX" | |
a5b5bb9a IM |
159 | }; |
160 | static const char *af_family_slock_key_strings[AF_MAX+1] = { | |
161 | "slock-AF_UNSPEC", "slock-AF_UNIX" , "slock-AF_INET" , | |
162 | "slock-AF_AX25" , "slock-AF_IPX" , "slock-AF_APPLETALK", | |
163 | "slock-AF_NETROM", "slock-AF_BRIDGE" , "slock-AF_ATMPVC" , | |
164 | "slock-AF_X25" , "slock-AF_INET6" , "slock-AF_ROSE" , | |
165 | "slock-AF_DECnet", "slock-AF_NETBEUI" , "slock-AF_SECURITY" , | |
166 | "slock-AF_KEY" , "slock-AF_NETLINK" , "slock-AF_PACKET" , | |
167 | "slock-AF_ASH" , "slock-AF_ECONET" , "slock-AF_ATMSVC" , | |
168 | "slock-21" , "slock-AF_SNA" , "slock-AF_IRDA" , | |
169 | "slock-AF_PPPOX" , "slock-AF_WANPIPE" , "slock-AF_LLC" , | |
170 | "slock-27" , "slock-28" , "slock-29" , | |
17926a79 DH |
171 | "slock-AF_TIPC" , "slock-AF_BLUETOOTH", "slock-AF_IUCV" , |
172 | "slock-AF_RXRPC" , "slock-AF_MAX" | |
a5b5bb9a IM |
173 | }; |
174 | #endif | |
da21f24d IM |
175 | |
176 | /* | |
177 | * sk_callback_lock locking rules are per-address-family, | |
178 | * so split the lock classes by using a per-AF key: | |
179 | */ | |
180 | static struct lock_class_key af_callback_keys[AF_MAX]; | |
181 | ||
1da177e4 LT |
182 | /* Take into consideration the size of the struct sk_buff overhead in the |
183 | * determination of these values, since that is non-constant across | |
184 | * platforms. This makes socket queueing behavior and performance | |
185 | * not depend upon such differences. | |
186 | */ | |
187 | #define _SK_MEM_PACKETS 256 | |
188 | #define _SK_MEM_OVERHEAD (sizeof(struct sk_buff) + 256) | |
189 | #define SK_WMEM_MAX (_SK_MEM_OVERHEAD * _SK_MEM_PACKETS) | |
190 | #define SK_RMEM_MAX (_SK_MEM_OVERHEAD * _SK_MEM_PACKETS) | |
191 | ||
192 | /* Run time adjustable parameters. */ | |
ab32ea5d BH |
193 | __u32 sysctl_wmem_max __read_mostly = SK_WMEM_MAX; |
194 | __u32 sysctl_rmem_max __read_mostly = SK_RMEM_MAX; | |
195 | __u32 sysctl_wmem_default __read_mostly = SK_WMEM_MAX; | |
196 | __u32 sysctl_rmem_default __read_mostly = SK_RMEM_MAX; | |
1da177e4 LT |
197 | |
198 | /* Maximal space eaten by iovec or ancilliary data plus some space */ | |
ab32ea5d | 199 | int sysctl_optmem_max __read_mostly = sizeof(unsigned long)*(2*UIO_MAXIOV+512); |
1da177e4 LT |
200 | |
201 | static int sock_set_timeout(long *timeo_p, char __user *optval, int optlen) | |
202 | { | |
203 | struct timeval tv; | |
204 | ||
205 | if (optlen < sizeof(tv)) | |
206 | return -EINVAL; | |
207 | if (copy_from_user(&tv, optval, sizeof(tv))) | |
208 | return -EFAULT; | |
ba78073e VA |
209 | if (tv.tv_usec < 0 || tv.tv_usec >= USEC_PER_SEC) |
210 | return -EDOM; | |
1da177e4 | 211 | |
ba78073e VA |
212 | if (tv.tv_sec < 0) { |
213 | static int warned = 0; | |
214 | *timeo_p = 0; | |
215 | if (warned < 10 && net_ratelimit()) | |
216 | warned++; | |
217 | printk(KERN_INFO "sock_set_timeout: `%s' (pid %d) " | |
218 | "tries to set negative timeout\n", | |
219 | current->comm, current->pid); | |
220 | return 0; | |
221 | } | |
1da177e4 LT |
222 | *timeo_p = MAX_SCHEDULE_TIMEOUT; |
223 | if (tv.tv_sec == 0 && tv.tv_usec == 0) | |
224 | return 0; | |
225 | if (tv.tv_sec < (MAX_SCHEDULE_TIMEOUT/HZ - 1)) | |
226 | *timeo_p = tv.tv_sec*HZ + (tv.tv_usec+(1000000/HZ-1))/(1000000/HZ); | |
227 | return 0; | |
228 | } | |
229 | ||
230 | static void sock_warn_obsolete_bsdism(const char *name) | |
231 | { | |
232 | static int warned; | |
233 | static char warncomm[TASK_COMM_LEN]; | |
4ec93edb YH |
234 | if (strcmp(warncomm, current->comm) && warned < 5) { |
235 | strcpy(warncomm, current->comm); | |
1da177e4 LT |
236 | printk(KERN_WARNING "process `%s' is using obsolete " |
237 | "%s SO_BSDCOMPAT\n", warncomm, name); | |
238 | warned++; | |
239 | } | |
240 | } | |
241 | ||
242 | static void sock_disable_timestamp(struct sock *sk) | |
4ec93edb YH |
243 | { |
244 | if (sock_flag(sk, SOCK_TIMESTAMP)) { | |
1da177e4 LT |
245 | sock_reset_flag(sk, SOCK_TIMESTAMP); |
246 | net_disable_timestamp(); | |
247 | } | |
248 | } | |
249 | ||
250 | ||
f0088a50 DV |
251 | int sock_queue_rcv_skb(struct sock *sk, struct sk_buff *skb) |
252 | { | |
253 | int err = 0; | |
254 | int skb_len; | |
255 | ||
256 | /* Cast skb->rcvbuf to unsigned... It's pointless, but reduces | |
257 | number of warnings when compiling with -W --ANK | |
258 | */ | |
259 | if (atomic_read(&sk->sk_rmem_alloc) + skb->truesize >= | |
260 | (unsigned)sk->sk_rcvbuf) { | |
261 | err = -ENOMEM; | |
262 | goto out; | |
263 | } | |
264 | ||
fda9ef5d | 265 | err = sk_filter(sk, skb); |
f0088a50 DV |
266 | if (err) |
267 | goto out; | |
268 | ||
269 | skb->dev = NULL; | |
270 | skb_set_owner_r(skb, sk); | |
271 | ||
272 | /* Cache the SKB length before we tack it onto the receive | |
273 | * queue. Once it is added it no longer belongs to us and | |
274 | * may be freed by other threads of control pulling packets | |
275 | * from the queue. | |
276 | */ | |
277 | skb_len = skb->len; | |
278 | ||
279 | skb_queue_tail(&sk->sk_receive_queue, skb); | |
280 | ||
281 | if (!sock_flag(sk, SOCK_DEAD)) | |
282 | sk->sk_data_ready(sk, skb_len); | |
283 | out: | |
284 | return err; | |
285 | } | |
286 | EXPORT_SYMBOL(sock_queue_rcv_skb); | |
287 | ||
58a5a7b9 | 288 | int sk_receive_skb(struct sock *sk, struct sk_buff *skb, const int nested) |
f0088a50 DV |
289 | { |
290 | int rc = NET_RX_SUCCESS; | |
291 | ||
fda9ef5d | 292 | if (sk_filter(sk, skb)) |
f0088a50 DV |
293 | goto discard_and_relse; |
294 | ||
295 | skb->dev = NULL; | |
296 | ||
58a5a7b9 ACM |
297 | if (nested) |
298 | bh_lock_sock_nested(sk); | |
299 | else | |
300 | bh_lock_sock(sk); | |
a5b5bb9a IM |
301 | if (!sock_owned_by_user(sk)) { |
302 | /* | |
303 | * trylock + unlock semantics: | |
304 | */ | |
305 | mutex_acquire(&sk->sk_lock.dep_map, 0, 1, _RET_IP_); | |
306 | ||
f0088a50 | 307 | rc = sk->sk_backlog_rcv(sk, skb); |
a5b5bb9a IM |
308 | |
309 | mutex_release(&sk->sk_lock.dep_map, 1, _RET_IP_); | |
310 | } else | |
f0088a50 DV |
311 | sk_add_backlog(sk, skb); |
312 | bh_unlock_sock(sk); | |
313 | out: | |
314 | sock_put(sk); | |
315 | return rc; | |
316 | discard_and_relse: | |
317 | kfree_skb(skb); | |
318 | goto out; | |
319 | } | |
320 | EXPORT_SYMBOL(sk_receive_skb); | |
321 | ||
322 | struct dst_entry *__sk_dst_check(struct sock *sk, u32 cookie) | |
323 | { | |
324 | struct dst_entry *dst = sk->sk_dst_cache; | |
325 | ||
326 | if (dst && dst->obsolete && dst->ops->check(dst, cookie) == NULL) { | |
327 | sk->sk_dst_cache = NULL; | |
328 | dst_release(dst); | |
329 | return NULL; | |
330 | } | |
331 | ||
332 | return dst; | |
333 | } | |
334 | EXPORT_SYMBOL(__sk_dst_check); | |
335 | ||
336 | struct dst_entry *sk_dst_check(struct sock *sk, u32 cookie) | |
337 | { | |
338 | struct dst_entry *dst = sk_dst_get(sk); | |
339 | ||
340 | if (dst && dst->obsolete && dst->ops->check(dst, cookie) == NULL) { | |
341 | sk_dst_reset(sk); | |
342 | dst_release(dst); | |
343 | return NULL; | |
344 | } | |
345 | ||
346 | return dst; | |
347 | } | |
348 | EXPORT_SYMBOL(sk_dst_check); | |
349 | ||
1da177e4 LT |
350 | /* |
351 | * This is meant for all protocols to use and covers goings on | |
352 | * at the socket level. Everything here is generic. | |
353 | */ | |
354 | ||
355 | int sock_setsockopt(struct socket *sock, int level, int optname, | |
356 | char __user *optval, int optlen) | |
357 | { | |
358 | struct sock *sk=sock->sk; | |
359 | struct sk_filter *filter; | |
360 | int val; | |
361 | int valbool; | |
362 | struct linger ling; | |
363 | int ret = 0; | |
4ec93edb | 364 | |
1da177e4 LT |
365 | /* |
366 | * Options without arguments | |
367 | */ | |
368 | ||
369 | #ifdef SO_DONTLINGER /* Compatibility item... */ | |
a77be819 KM |
370 | if (optname == SO_DONTLINGER) { |
371 | lock_sock(sk); | |
372 | sock_reset_flag(sk, SOCK_LINGER); | |
373 | release_sock(sk); | |
374 | return 0; | |
1da177e4 | 375 | } |
a77be819 | 376 | #endif |
4ec93edb | 377 | |
e71a4783 SH |
378 | if (optlen < sizeof(int)) |
379 | return -EINVAL; | |
4ec93edb | 380 | |
1da177e4 LT |
381 | if (get_user(val, (int __user *)optval)) |
382 | return -EFAULT; | |
4ec93edb YH |
383 | |
384 | valbool = val?1:0; | |
1da177e4 LT |
385 | |
386 | lock_sock(sk); | |
387 | ||
e71a4783 SH |
388 | switch(optname) { |
389 | case SO_DEBUG: | |
390 | if (val && !capable(CAP_NET_ADMIN)) { | |
391 | ret = -EACCES; | |
392 | } | |
393 | else if (valbool) | |
394 | sock_set_flag(sk, SOCK_DBG); | |
395 | else | |
396 | sock_reset_flag(sk, SOCK_DBG); | |
397 | break; | |
398 | case SO_REUSEADDR: | |
399 | sk->sk_reuse = valbool; | |
400 | break; | |
401 | case SO_TYPE: | |
402 | case SO_ERROR: | |
403 | ret = -ENOPROTOOPT; | |
404 | break; | |
405 | case SO_DONTROUTE: | |
406 | if (valbool) | |
407 | sock_set_flag(sk, SOCK_LOCALROUTE); | |
408 | else | |
409 | sock_reset_flag(sk, SOCK_LOCALROUTE); | |
410 | break; | |
411 | case SO_BROADCAST: | |
412 | sock_valbool_flag(sk, SOCK_BROADCAST, valbool); | |
413 | break; | |
414 | case SO_SNDBUF: | |
415 | /* Don't error on this BSD doesn't and if you think | |
416 | about it this is right. Otherwise apps have to | |
417 | play 'guess the biggest size' games. RCVBUF/SNDBUF | |
418 | are treated in BSD as hints */ | |
419 | ||
420 | if (val > sysctl_wmem_max) | |
421 | val = sysctl_wmem_max; | |
b0573dea | 422 | set_sndbuf: |
e71a4783 SH |
423 | sk->sk_userlocks |= SOCK_SNDBUF_LOCK; |
424 | if ((val * 2) < SOCK_MIN_SNDBUF) | |
425 | sk->sk_sndbuf = SOCK_MIN_SNDBUF; | |
426 | else | |
427 | sk->sk_sndbuf = val * 2; | |
1da177e4 | 428 | |
e71a4783 SH |
429 | /* |
430 | * Wake up sending tasks if we | |
431 | * upped the value. | |
432 | */ | |
433 | sk->sk_write_space(sk); | |
434 | break; | |
1da177e4 | 435 | |
e71a4783 SH |
436 | case SO_SNDBUFFORCE: |
437 | if (!capable(CAP_NET_ADMIN)) { | |
438 | ret = -EPERM; | |
439 | break; | |
440 | } | |
441 | goto set_sndbuf; | |
b0573dea | 442 | |
e71a4783 SH |
443 | case SO_RCVBUF: |
444 | /* Don't error on this BSD doesn't and if you think | |
445 | about it this is right. Otherwise apps have to | |
446 | play 'guess the biggest size' games. RCVBUF/SNDBUF | |
447 | are treated in BSD as hints */ | |
4ec93edb | 448 | |
e71a4783 SH |
449 | if (val > sysctl_rmem_max) |
450 | val = sysctl_rmem_max; | |
b0573dea | 451 | set_rcvbuf: |
e71a4783 SH |
452 | sk->sk_userlocks |= SOCK_RCVBUF_LOCK; |
453 | /* | |
454 | * We double it on the way in to account for | |
455 | * "struct sk_buff" etc. overhead. Applications | |
456 | * assume that the SO_RCVBUF setting they make will | |
457 | * allow that much actual data to be received on that | |
458 | * socket. | |
459 | * | |
460 | * Applications are unaware that "struct sk_buff" and | |
461 | * other overheads allocate from the receive buffer | |
462 | * during socket buffer allocation. | |
463 | * | |
464 | * And after considering the possible alternatives, | |
465 | * returning the value we actually used in getsockopt | |
466 | * is the most desirable behavior. | |
467 | */ | |
468 | if ((val * 2) < SOCK_MIN_RCVBUF) | |
469 | sk->sk_rcvbuf = SOCK_MIN_RCVBUF; | |
470 | else | |
471 | sk->sk_rcvbuf = val * 2; | |
472 | break; | |
473 | ||
474 | case SO_RCVBUFFORCE: | |
475 | if (!capable(CAP_NET_ADMIN)) { | |
476 | ret = -EPERM; | |
1da177e4 | 477 | break; |
e71a4783 SH |
478 | } |
479 | goto set_rcvbuf; | |
1da177e4 | 480 | |
e71a4783 | 481 | case SO_KEEPALIVE: |
1da177e4 | 482 | #ifdef CONFIG_INET |
e71a4783 SH |
483 | if (sk->sk_protocol == IPPROTO_TCP) |
484 | tcp_set_keepalive(sk, valbool); | |
1da177e4 | 485 | #endif |
e71a4783 SH |
486 | sock_valbool_flag(sk, SOCK_KEEPOPEN, valbool); |
487 | break; | |
488 | ||
489 | case SO_OOBINLINE: | |
490 | sock_valbool_flag(sk, SOCK_URGINLINE, valbool); | |
491 | break; | |
492 | ||
493 | case SO_NO_CHECK: | |
494 | sk->sk_no_check = valbool; | |
495 | break; | |
496 | ||
497 | case SO_PRIORITY: | |
498 | if ((val >= 0 && val <= 6) || capable(CAP_NET_ADMIN)) | |
499 | sk->sk_priority = val; | |
500 | else | |
501 | ret = -EPERM; | |
502 | break; | |
503 | ||
504 | case SO_LINGER: | |
505 | if (optlen < sizeof(ling)) { | |
506 | ret = -EINVAL; /* 1003.1g */ | |
1da177e4 | 507 | break; |
e71a4783 SH |
508 | } |
509 | if (copy_from_user(&ling,optval,sizeof(ling))) { | |
510 | ret = -EFAULT; | |
1da177e4 | 511 | break; |
e71a4783 SH |
512 | } |
513 | if (!ling.l_onoff) | |
514 | sock_reset_flag(sk, SOCK_LINGER); | |
515 | else { | |
1da177e4 | 516 | #if (BITS_PER_LONG == 32) |
e71a4783 SH |
517 | if ((unsigned int)ling.l_linger >= MAX_SCHEDULE_TIMEOUT/HZ) |
518 | sk->sk_lingertime = MAX_SCHEDULE_TIMEOUT; | |
1da177e4 | 519 | else |
e71a4783 SH |
520 | #endif |
521 | sk->sk_lingertime = (unsigned int)ling.l_linger * HZ; | |
522 | sock_set_flag(sk, SOCK_LINGER); | |
523 | } | |
524 | break; | |
525 | ||
526 | case SO_BSDCOMPAT: | |
527 | sock_warn_obsolete_bsdism("setsockopt"); | |
528 | break; | |
529 | ||
530 | case SO_PASSCRED: | |
531 | if (valbool) | |
532 | set_bit(SOCK_PASSCRED, &sock->flags); | |
533 | else | |
534 | clear_bit(SOCK_PASSCRED, &sock->flags); | |
535 | break; | |
536 | ||
537 | case SO_TIMESTAMP: | |
92f37fd2 | 538 | case SO_TIMESTAMPNS: |
e71a4783 | 539 | if (valbool) { |
92f37fd2 ED |
540 | if (optname == SO_TIMESTAMP) |
541 | sock_reset_flag(sk, SOCK_RCVTSTAMPNS); | |
542 | else | |
543 | sock_set_flag(sk, SOCK_RCVTSTAMPNS); | |
e71a4783 SH |
544 | sock_set_flag(sk, SOCK_RCVTSTAMP); |
545 | sock_enable_timestamp(sk); | |
92f37fd2 | 546 | } else { |
e71a4783 | 547 | sock_reset_flag(sk, SOCK_RCVTSTAMP); |
92f37fd2 ED |
548 | sock_reset_flag(sk, SOCK_RCVTSTAMPNS); |
549 | } | |
e71a4783 SH |
550 | break; |
551 | ||
552 | case SO_RCVLOWAT: | |
553 | if (val < 0) | |
554 | val = INT_MAX; | |
555 | sk->sk_rcvlowat = val ? : 1; | |
556 | break; | |
557 | ||
558 | case SO_RCVTIMEO: | |
559 | ret = sock_set_timeout(&sk->sk_rcvtimeo, optval, optlen); | |
560 | break; | |
561 | ||
562 | case SO_SNDTIMEO: | |
563 | ret = sock_set_timeout(&sk->sk_sndtimeo, optval, optlen); | |
564 | break; | |
1da177e4 | 565 | |
e71a4783 SH |
566 | #ifdef CONFIG_NETDEVICES |
567 | case SO_BINDTODEVICE: | |
568 | { | |
569 | char devname[IFNAMSIZ]; | |
1da177e4 | 570 | |
e71a4783 SH |
571 | /* Sorry... */ |
572 | if (!capable(CAP_NET_RAW)) { | |
573 | ret = -EPERM; | |
1da177e4 | 574 | break; |
e71a4783 | 575 | } |
1da177e4 | 576 | |
e71a4783 SH |
577 | /* Bind this socket to a particular device like "eth0", |
578 | * as specified in the passed interface name. If the | |
579 | * name is "" or the option length is zero the socket | |
580 | * is not bound. | |
581 | */ | |
1da177e4 | 582 | |
e71a4783 SH |
583 | if (!valbool) { |
584 | sk->sk_bound_dev_if = 0; | |
585 | } else { | |
586 | if (optlen > IFNAMSIZ - 1) | |
587 | optlen = IFNAMSIZ - 1; | |
588 | memset(devname, 0, sizeof(devname)); | |
589 | if (copy_from_user(devname, optval, optlen)) { | |
590 | ret = -EFAULT; | |
1da177e4 LT |
591 | break; |
592 | } | |
593 | ||
e71a4783 SH |
594 | /* Remove any cached route for this socket. */ |
595 | sk_dst_reset(sk); | |
1da177e4 | 596 | |
e71a4783 | 597 | if (devname[0] == '\0') { |
1da177e4 LT |
598 | sk->sk_bound_dev_if = 0; |
599 | } else { | |
e71a4783 SH |
600 | struct net_device *dev = dev_get_by_name(devname); |
601 | if (!dev) { | |
602 | ret = -ENODEV; | |
1da177e4 LT |
603 | break; |
604 | } | |
e71a4783 SH |
605 | sk->sk_bound_dev_if = dev->ifindex; |
606 | dev_put(dev); | |
1da177e4 | 607 | } |
1da177e4 | 608 | } |
e71a4783 SH |
609 | break; |
610 | } | |
1da177e4 LT |
611 | #endif |
612 | ||
613 | ||
e71a4783 SH |
614 | case SO_ATTACH_FILTER: |
615 | ret = -EINVAL; | |
616 | if (optlen == sizeof(struct sock_fprog)) { | |
617 | struct sock_fprog fprog; | |
1da177e4 | 618 | |
e71a4783 SH |
619 | ret = -EFAULT; |
620 | if (copy_from_user(&fprog, optval, sizeof(fprog))) | |
1da177e4 | 621 | break; |
e71a4783 SH |
622 | |
623 | ret = sk_attach_filter(&fprog, sk); | |
624 | } | |
625 | break; | |
626 | ||
627 | case SO_DETACH_FILTER: | |
628 | rcu_read_lock_bh(); | |
629 | filter = rcu_dereference(sk->sk_filter); | |
630 | if (filter) { | |
631 | rcu_assign_pointer(sk->sk_filter, NULL); | |
632 | sk_filter_release(sk, filter); | |
fda9ef5d | 633 | rcu_read_unlock_bh(); |
1da177e4 | 634 | break; |
e71a4783 SH |
635 | } |
636 | rcu_read_unlock_bh(); | |
637 | ret = -ENONET; | |
638 | break; | |
1da177e4 | 639 | |
e71a4783 SH |
640 | case SO_PASSSEC: |
641 | if (valbool) | |
642 | set_bit(SOCK_PASSSEC, &sock->flags); | |
643 | else | |
644 | clear_bit(SOCK_PASSSEC, &sock->flags); | |
645 | break; | |
877ce7c1 | 646 | |
1da177e4 LT |
647 | /* We implement the SO_SNDLOWAT etc to |
648 | not be settable (1003.1g 5.3) */ | |
e71a4783 SH |
649 | default: |
650 | ret = -ENOPROTOOPT; | |
651 | break; | |
4ec93edb | 652 | } |
1da177e4 LT |
653 | release_sock(sk); |
654 | return ret; | |
655 | } | |
656 | ||
657 | ||
658 | int sock_getsockopt(struct socket *sock, int level, int optname, | |
659 | char __user *optval, int __user *optlen) | |
660 | { | |
661 | struct sock *sk = sock->sk; | |
4ec93edb | 662 | |
e71a4783 | 663 | union { |
4ec93edb YH |
664 | int val; |
665 | struct linger ling; | |
1da177e4 LT |
666 | struct timeval tm; |
667 | } v; | |
4ec93edb | 668 | |
1da177e4 LT |
669 | unsigned int lv = sizeof(int); |
670 | int len; | |
4ec93edb | 671 | |
e71a4783 | 672 | if (get_user(len, optlen)) |
4ec93edb | 673 | return -EFAULT; |
e71a4783 | 674 | if (len < 0) |
1da177e4 | 675 | return -EINVAL; |
4ec93edb | 676 | |
e71a4783 SH |
677 | switch(optname) { |
678 | case SO_DEBUG: | |
679 | v.val = sock_flag(sk, SOCK_DBG); | |
680 | break; | |
681 | ||
682 | case SO_DONTROUTE: | |
683 | v.val = sock_flag(sk, SOCK_LOCALROUTE); | |
684 | break; | |
685 | ||
686 | case SO_BROADCAST: | |
687 | v.val = !!sock_flag(sk, SOCK_BROADCAST); | |
688 | break; | |
689 | ||
690 | case SO_SNDBUF: | |
691 | v.val = sk->sk_sndbuf; | |
692 | break; | |
693 | ||
694 | case SO_RCVBUF: | |
695 | v.val = sk->sk_rcvbuf; | |
696 | break; | |
697 | ||
698 | case SO_REUSEADDR: | |
699 | v.val = sk->sk_reuse; | |
700 | break; | |
701 | ||
702 | case SO_KEEPALIVE: | |
703 | v.val = !!sock_flag(sk, SOCK_KEEPOPEN); | |
704 | break; | |
705 | ||
706 | case SO_TYPE: | |
707 | v.val = sk->sk_type; | |
708 | break; | |
709 | ||
710 | case SO_ERROR: | |
711 | v.val = -sock_error(sk); | |
712 | if (v.val==0) | |
713 | v.val = xchg(&sk->sk_err_soft, 0); | |
714 | break; | |
715 | ||
716 | case SO_OOBINLINE: | |
717 | v.val = !!sock_flag(sk, SOCK_URGINLINE); | |
718 | break; | |
719 | ||
720 | case SO_NO_CHECK: | |
721 | v.val = sk->sk_no_check; | |
722 | break; | |
723 | ||
724 | case SO_PRIORITY: | |
725 | v.val = sk->sk_priority; | |
726 | break; | |
727 | ||
728 | case SO_LINGER: | |
729 | lv = sizeof(v.ling); | |
730 | v.ling.l_onoff = !!sock_flag(sk, SOCK_LINGER); | |
731 | v.ling.l_linger = sk->sk_lingertime / HZ; | |
732 | break; | |
733 | ||
734 | case SO_BSDCOMPAT: | |
735 | sock_warn_obsolete_bsdism("getsockopt"); | |
736 | break; | |
737 | ||
738 | case SO_TIMESTAMP: | |
92f37fd2 ED |
739 | v.val = sock_flag(sk, SOCK_RCVTSTAMP) && |
740 | !sock_flag(sk, SOCK_RCVTSTAMPNS); | |
741 | break; | |
742 | ||
743 | case SO_TIMESTAMPNS: | |
744 | v.val = sock_flag(sk, SOCK_RCVTSTAMPNS); | |
e71a4783 SH |
745 | break; |
746 | ||
747 | case SO_RCVTIMEO: | |
748 | lv=sizeof(struct timeval); | |
749 | if (sk->sk_rcvtimeo == MAX_SCHEDULE_TIMEOUT) { | |
750 | v.tm.tv_sec = 0; | |
751 | v.tm.tv_usec = 0; | |
752 | } else { | |
753 | v.tm.tv_sec = sk->sk_rcvtimeo / HZ; | |
754 | v.tm.tv_usec = ((sk->sk_rcvtimeo % HZ) * 1000000) / HZ; | |
755 | } | |
756 | break; | |
757 | ||
758 | case SO_SNDTIMEO: | |
759 | lv=sizeof(struct timeval); | |
760 | if (sk->sk_sndtimeo == MAX_SCHEDULE_TIMEOUT) { | |
761 | v.tm.tv_sec = 0; | |
762 | v.tm.tv_usec = 0; | |
763 | } else { | |
764 | v.tm.tv_sec = sk->sk_sndtimeo / HZ; | |
765 | v.tm.tv_usec = ((sk->sk_sndtimeo % HZ) * 1000000) / HZ; | |
766 | } | |
767 | break; | |
1da177e4 | 768 | |
e71a4783 SH |
769 | case SO_RCVLOWAT: |
770 | v.val = sk->sk_rcvlowat; | |
771 | break; | |
1da177e4 | 772 | |
e71a4783 SH |
773 | case SO_SNDLOWAT: |
774 | v.val=1; | |
775 | break; | |
1da177e4 | 776 | |
e71a4783 SH |
777 | case SO_PASSCRED: |
778 | v.val = test_bit(SOCK_PASSCRED, &sock->flags) ? 1 : 0; | |
779 | break; | |
1da177e4 | 780 | |
e71a4783 SH |
781 | case SO_PEERCRED: |
782 | if (len > sizeof(sk->sk_peercred)) | |
783 | len = sizeof(sk->sk_peercred); | |
784 | if (copy_to_user(optval, &sk->sk_peercred, len)) | |
785 | return -EFAULT; | |
786 | goto lenout; | |
1da177e4 | 787 | |
e71a4783 SH |
788 | case SO_PEERNAME: |
789 | { | |
790 | char address[128]; | |
791 | ||
792 | if (sock->ops->getname(sock, (struct sockaddr *)address, &lv, 2)) | |
793 | return -ENOTCONN; | |
794 | if (lv < len) | |
795 | return -EINVAL; | |
796 | if (copy_to_user(optval, address, len)) | |
797 | return -EFAULT; | |
798 | goto lenout; | |
799 | } | |
1da177e4 | 800 | |
e71a4783 SH |
801 | /* Dubious BSD thing... Probably nobody even uses it, but |
802 | * the UNIX standard wants it for whatever reason... -DaveM | |
803 | */ | |
804 | case SO_ACCEPTCONN: | |
805 | v.val = sk->sk_state == TCP_LISTEN; | |
806 | break; | |
1da177e4 | 807 | |
e71a4783 SH |
808 | case SO_PASSSEC: |
809 | v.val = test_bit(SOCK_PASSSEC, &sock->flags) ? 1 : 0; | |
810 | break; | |
877ce7c1 | 811 | |
e71a4783 SH |
812 | case SO_PEERSEC: |
813 | return security_socket_getpeersec_stream(sock, optval, optlen, len); | |
1da177e4 | 814 | |
e71a4783 SH |
815 | default: |
816 | return -ENOPROTOOPT; | |
1da177e4 | 817 | } |
e71a4783 | 818 | |
1da177e4 LT |
819 | if (len > lv) |
820 | len = lv; | |
821 | if (copy_to_user(optval, &v, len)) | |
822 | return -EFAULT; | |
823 | lenout: | |
4ec93edb YH |
824 | if (put_user(len, optlen)) |
825 | return -EFAULT; | |
826 | return 0; | |
1da177e4 LT |
827 | } |
828 | ||
a5b5bb9a IM |
829 | /* |
830 | * Initialize an sk_lock. | |
831 | * | |
832 | * (We also register the sk_lock with the lock validator.) | |
833 | */ | |
b6f99a21 | 834 | static inline void sock_lock_init(struct sock *sk) |
a5b5bb9a | 835 | { |
ed07536e PZ |
836 | sock_lock_init_class_and_name(sk, |
837 | af_family_slock_key_strings[sk->sk_family], | |
838 | af_family_slock_keys + sk->sk_family, | |
839 | af_family_key_strings[sk->sk_family], | |
840 | af_family_keys + sk->sk_family); | |
a5b5bb9a IM |
841 | } |
842 | ||
1da177e4 LT |
843 | /** |
844 | * sk_alloc - All socket objects are allocated here | |
4dc3b16b PP |
845 | * @family: protocol family |
846 | * @priority: for allocation (%GFP_KERNEL, %GFP_ATOMIC, etc) | |
847 | * @prot: struct proto associated with this new sock instance | |
848 | * @zero_it: if we should zero the newly allocated sock | |
1da177e4 | 849 | */ |
dd0fc66f | 850 | struct sock *sk_alloc(int family, gfp_t priority, |
86a76caf | 851 | struct proto *prot, int zero_it) |
1da177e4 LT |
852 | { |
853 | struct sock *sk = NULL; | |
e18b890b | 854 | struct kmem_cache *slab = prot->slab; |
1da177e4 LT |
855 | |
856 | if (slab != NULL) | |
857 | sk = kmem_cache_alloc(slab, priority); | |
858 | else | |
859 | sk = kmalloc(prot->obj_size, priority); | |
860 | ||
861 | if (sk) { | |
862 | if (zero_it) { | |
863 | memset(sk, 0, prot->obj_size); | |
864 | sk->sk_family = family; | |
476e19cf ACM |
865 | /* |
866 | * See comment in struct sock definition to understand | |
867 | * why we need sk_prot_creator -acme | |
868 | */ | |
869 | sk->sk_prot = sk->sk_prot_creator = prot; | |
1da177e4 LT |
870 | sock_lock_init(sk); |
871 | } | |
4ec93edb | 872 | |
a79af59e FF |
873 | if (security_sk_alloc(sk, family, priority)) |
874 | goto out_free; | |
875 | ||
876 | if (!try_module_get(prot->owner)) | |
877 | goto out_free; | |
1da177e4 LT |
878 | } |
879 | return sk; | |
a79af59e FF |
880 | |
881 | out_free: | |
882 | if (slab != NULL) | |
883 | kmem_cache_free(slab, sk); | |
884 | else | |
885 | kfree(sk); | |
886 | return NULL; | |
1da177e4 LT |
887 | } |
888 | ||
889 | void sk_free(struct sock *sk) | |
890 | { | |
891 | struct sk_filter *filter; | |
476e19cf | 892 | struct module *owner = sk->sk_prot_creator->owner; |
1da177e4 LT |
893 | |
894 | if (sk->sk_destruct) | |
895 | sk->sk_destruct(sk); | |
896 | ||
fda9ef5d | 897 | filter = rcu_dereference(sk->sk_filter); |
1da177e4 LT |
898 | if (filter) { |
899 | sk_filter_release(sk, filter); | |
fda9ef5d | 900 | rcu_assign_pointer(sk->sk_filter, NULL); |
1da177e4 LT |
901 | } |
902 | ||
903 | sock_disable_timestamp(sk); | |
904 | ||
905 | if (atomic_read(&sk->sk_omem_alloc)) | |
906 | printk(KERN_DEBUG "%s: optmem leakage (%d bytes) detected.\n", | |
907 | __FUNCTION__, atomic_read(&sk->sk_omem_alloc)); | |
908 | ||
909 | security_sk_free(sk); | |
476e19cf ACM |
910 | if (sk->sk_prot_creator->slab != NULL) |
911 | kmem_cache_free(sk->sk_prot_creator->slab, sk); | |
1da177e4 LT |
912 | else |
913 | kfree(sk); | |
914 | module_put(owner); | |
915 | } | |
916 | ||
dd0fc66f | 917 | struct sock *sk_clone(const struct sock *sk, const gfp_t priority) |
87d11ceb ACM |
918 | { |
919 | struct sock *newsk = sk_alloc(sk->sk_family, priority, sk->sk_prot, 0); | |
920 | ||
921 | if (newsk != NULL) { | |
922 | struct sk_filter *filter; | |
923 | ||
892c141e | 924 | sock_copy(newsk, sk); |
87d11ceb ACM |
925 | |
926 | /* SANITY */ | |
927 | sk_node_init(&newsk->sk_node); | |
928 | sock_lock_init(newsk); | |
929 | bh_lock_sock(newsk); | |
fa438ccf | 930 | newsk->sk_backlog.head = newsk->sk_backlog.tail = NULL; |
87d11ceb ACM |
931 | |
932 | atomic_set(&newsk->sk_rmem_alloc, 0); | |
933 | atomic_set(&newsk->sk_wmem_alloc, 0); | |
934 | atomic_set(&newsk->sk_omem_alloc, 0); | |
935 | skb_queue_head_init(&newsk->sk_receive_queue); | |
936 | skb_queue_head_init(&newsk->sk_write_queue); | |
97fc2f08 CL |
937 | #ifdef CONFIG_NET_DMA |
938 | skb_queue_head_init(&newsk->sk_async_wait_queue); | |
939 | #endif | |
87d11ceb ACM |
940 | |
941 | rwlock_init(&newsk->sk_dst_lock); | |
942 | rwlock_init(&newsk->sk_callback_lock); | |
da21f24d IM |
943 | lockdep_set_class(&newsk->sk_callback_lock, |
944 | af_callback_keys + newsk->sk_family); | |
87d11ceb ACM |
945 | |
946 | newsk->sk_dst_cache = NULL; | |
947 | newsk->sk_wmem_queued = 0; | |
948 | newsk->sk_forward_alloc = 0; | |
949 | newsk->sk_send_head = NULL; | |
87d11ceb ACM |
950 | newsk->sk_userlocks = sk->sk_userlocks & ~SOCK_BINDPORT_LOCK; |
951 | ||
952 | sock_reset_flag(newsk, SOCK_DONE); | |
953 | skb_queue_head_init(&newsk->sk_error_queue); | |
954 | ||
955 | filter = newsk->sk_filter; | |
956 | if (filter != NULL) | |
957 | sk_filter_charge(newsk, filter); | |
958 | ||
959 | if (unlikely(xfrm_sk_clone_policy(newsk))) { | |
960 | /* It is still raw copy of parent, so invalidate | |
961 | * destructor and make plain sk_free() */ | |
962 | newsk->sk_destruct = NULL; | |
963 | sk_free(newsk); | |
964 | newsk = NULL; | |
965 | goto out; | |
966 | } | |
967 | ||
968 | newsk->sk_err = 0; | |
969 | newsk->sk_priority = 0; | |
970 | atomic_set(&newsk->sk_refcnt, 2); | |
971 | ||
972 | /* | |
973 | * Increment the counter in the same struct proto as the master | |
974 | * sock (sk_refcnt_debug_inc uses newsk->sk_prot->socks, that | |
975 | * is the same as sk->sk_prot->socks, as this field was copied | |
976 | * with memcpy). | |
977 | * | |
978 | * This _changes_ the previous behaviour, where | |
979 | * tcp_create_openreq_child always was incrementing the | |
980 | * equivalent to tcp_prot->socks (inet_sock_nr), so this have | |
981 | * to be taken into account in all callers. -acme | |
982 | */ | |
983 | sk_refcnt_debug_inc(newsk); | |
984 | newsk->sk_socket = NULL; | |
985 | newsk->sk_sleep = NULL; | |
986 | ||
987 | if (newsk->sk_prot->sockets_allocated) | |
988 | atomic_inc(newsk->sk_prot->sockets_allocated); | |
989 | } | |
990 | out: | |
991 | return newsk; | |
992 | } | |
993 | ||
994 | EXPORT_SYMBOL_GPL(sk_clone); | |
995 | ||
9958089a AK |
996 | void sk_setup_caps(struct sock *sk, struct dst_entry *dst) |
997 | { | |
998 | __sk_dst_set(sk, dst); | |
999 | sk->sk_route_caps = dst->dev->features; | |
1000 | if (sk->sk_route_caps & NETIF_F_GSO) | |
4fcd6b99 | 1001 | sk->sk_route_caps |= NETIF_F_GSO_SOFTWARE; |
9958089a AK |
1002 | if (sk_can_gso(sk)) { |
1003 | if (dst->header_len) | |
1004 | sk->sk_route_caps &= ~NETIF_F_GSO_MASK; | |
1005 | else | |
1006 | sk->sk_route_caps |= NETIF_F_SG | NETIF_F_HW_CSUM; | |
1007 | } | |
1008 | } | |
1009 | EXPORT_SYMBOL_GPL(sk_setup_caps); | |
1010 | ||
1da177e4 LT |
1011 | void __init sk_init(void) |
1012 | { | |
1013 | if (num_physpages <= 4096) { | |
1014 | sysctl_wmem_max = 32767; | |
1015 | sysctl_rmem_max = 32767; | |
1016 | sysctl_wmem_default = 32767; | |
1017 | sysctl_rmem_default = 32767; | |
1018 | } else if (num_physpages >= 131072) { | |
1019 | sysctl_wmem_max = 131071; | |
1020 | sysctl_rmem_max = 131071; | |
1021 | } | |
1022 | } | |
1023 | ||
1024 | /* | |
1025 | * Simple resource managers for sockets. | |
1026 | */ | |
1027 | ||
1028 | ||
4ec93edb YH |
1029 | /* |
1030 | * Write buffer destructor automatically called from kfree_skb. | |
1da177e4 LT |
1031 | */ |
1032 | void sock_wfree(struct sk_buff *skb) | |
1033 | { | |
1034 | struct sock *sk = skb->sk; | |
1035 | ||
1036 | /* In case it might be waiting for more memory. */ | |
1037 | atomic_sub(skb->truesize, &sk->sk_wmem_alloc); | |
1038 | if (!sock_flag(sk, SOCK_USE_WRITE_QUEUE)) | |
1039 | sk->sk_write_space(sk); | |
1040 | sock_put(sk); | |
1041 | } | |
1042 | ||
4ec93edb YH |
1043 | /* |
1044 | * Read buffer destructor automatically called from kfree_skb. | |
1da177e4 LT |
1045 | */ |
1046 | void sock_rfree(struct sk_buff *skb) | |
1047 | { | |
1048 | struct sock *sk = skb->sk; | |
1049 | ||
1050 | atomic_sub(skb->truesize, &sk->sk_rmem_alloc); | |
1051 | } | |
1052 | ||
1053 | ||
1054 | int sock_i_uid(struct sock *sk) | |
1055 | { | |
1056 | int uid; | |
1057 | ||
1058 | read_lock(&sk->sk_callback_lock); | |
1059 | uid = sk->sk_socket ? SOCK_INODE(sk->sk_socket)->i_uid : 0; | |
1060 | read_unlock(&sk->sk_callback_lock); | |
1061 | return uid; | |
1062 | } | |
1063 | ||
1064 | unsigned long sock_i_ino(struct sock *sk) | |
1065 | { | |
1066 | unsigned long ino; | |
1067 | ||
1068 | read_lock(&sk->sk_callback_lock); | |
1069 | ino = sk->sk_socket ? SOCK_INODE(sk->sk_socket)->i_ino : 0; | |
1070 | read_unlock(&sk->sk_callback_lock); | |
1071 | return ino; | |
1072 | } | |
1073 | ||
1074 | /* | |
1075 | * Allocate a skb from the socket's send buffer. | |
1076 | */ | |
86a76caf | 1077 | struct sk_buff *sock_wmalloc(struct sock *sk, unsigned long size, int force, |
dd0fc66f | 1078 | gfp_t priority) |
1da177e4 LT |
1079 | { |
1080 | if (force || atomic_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf) { | |
1081 | struct sk_buff * skb = alloc_skb(size, priority); | |
1082 | if (skb) { | |
1083 | skb_set_owner_w(skb, sk); | |
1084 | return skb; | |
1085 | } | |
1086 | } | |
1087 | return NULL; | |
1088 | } | |
1089 | ||
1090 | /* | |
1091 | * Allocate a skb from the socket's receive buffer. | |
4ec93edb | 1092 | */ |
86a76caf | 1093 | struct sk_buff *sock_rmalloc(struct sock *sk, unsigned long size, int force, |
dd0fc66f | 1094 | gfp_t priority) |
1da177e4 LT |
1095 | { |
1096 | if (force || atomic_read(&sk->sk_rmem_alloc) < sk->sk_rcvbuf) { | |
1097 | struct sk_buff *skb = alloc_skb(size, priority); | |
1098 | if (skb) { | |
1099 | skb_set_owner_r(skb, sk); | |
1100 | return skb; | |
1101 | } | |
1102 | } | |
1103 | return NULL; | |
1104 | } | |
1105 | ||
4ec93edb | 1106 | /* |
1da177e4 | 1107 | * Allocate a memory block from the socket's option memory buffer. |
4ec93edb | 1108 | */ |
dd0fc66f | 1109 | void *sock_kmalloc(struct sock *sk, int size, gfp_t priority) |
1da177e4 LT |
1110 | { |
1111 | if ((unsigned)size <= sysctl_optmem_max && | |
1112 | atomic_read(&sk->sk_omem_alloc) + size < sysctl_optmem_max) { | |
1113 | void *mem; | |
1114 | /* First do the add, to avoid the race if kmalloc | |
4ec93edb | 1115 | * might sleep. |
1da177e4 LT |
1116 | */ |
1117 | atomic_add(size, &sk->sk_omem_alloc); | |
1118 | mem = kmalloc(size, priority); | |
1119 | if (mem) | |
1120 | return mem; | |
1121 | atomic_sub(size, &sk->sk_omem_alloc); | |
1122 | } | |
1123 | return NULL; | |
1124 | } | |
1125 | ||
1126 | /* | |
1127 | * Free an option memory block. | |
1128 | */ | |
1129 | void sock_kfree_s(struct sock *sk, void *mem, int size) | |
1130 | { | |
1131 | kfree(mem); | |
1132 | atomic_sub(size, &sk->sk_omem_alloc); | |
1133 | } | |
1134 | ||
1135 | /* It is almost wait_for_tcp_memory minus release_sock/lock_sock. | |
1136 | I think, these locks should be removed for datagram sockets. | |
1137 | */ | |
1138 | static long sock_wait_for_wmem(struct sock * sk, long timeo) | |
1139 | { | |
1140 | DEFINE_WAIT(wait); | |
1141 | ||
1142 | clear_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags); | |
1143 | for (;;) { | |
1144 | if (!timeo) | |
1145 | break; | |
1146 | if (signal_pending(current)) | |
1147 | break; | |
1148 | set_bit(SOCK_NOSPACE, &sk->sk_socket->flags); | |
1149 | prepare_to_wait(sk->sk_sleep, &wait, TASK_INTERRUPTIBLE); | |
1150 | if (atomic_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf) | |
1151 | break; | |
1152 | if (sk->sk_shutdown & SEND_SHUTDOWN) | |
1153 | break; | |
1154 | if (sk->sk_err) | |
1155 | break; | |
1156 | timeo = schedule_timeout(timeo); | |
1157 | } | |
1158 | finish_wait(sk->sk_sleep, &wait); | |
1159 | return timeo; | |
1160 | } | |
1161 | ||
1162 | ||
1163 | /* | |
1164 | * Generic send/receive buffer handlers | |
1165 | */ | |
1166 | ||
1167 | static struct sk_buff *sock_alloc_send_pskb(struct sock *sk, | |
1168 | unsigned long header_len, | |
1169 | unsigned long data_len, | |
1170 | int noblock, int *errcode) | |
1171 | { | |
1172 | struct sk_buff *skb; | |
7d877f3b | 1173 | gfp_t gfp_mask; |
1da177e4 LT |
1174 | long timeo; |
1175 | int err; | |
1176 | ||
1177 | gfp_mask = sk->sk_allocation; | |
1178 | if (gfp_mask & __GFP_WAIT) | |
1179 | gfp_mask |= __GFP_REPEAT; | |
1180 | ||
1181 | timeo = sock_sndtimeo(sk, noblock); | |
1182 | while (1) { | |
1183 | err = sock_error(sk); | |
1184 | if (err != 0) | |
1185 | goto failure; | |
1186 | ||
1187 | err = -EPIPE; | |
1188 | if (sk->sk_shutdown & SEND_SHUTDOWN) | |
1189 | goto failure; | |
1190 | ||
1191 | if (atomic_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf) { | |
db38c179 | 1192 | skb = alloc_skb(header_len, gfp_mask); |
1da177e4 LT |
1193 | if (skb) { |
1194 | int npages; | |
1195 | int i; | |
1196 | ||
1197 | /* No pages, we're done... */ | |
1198 | if (!data_len) | |
1199 | break; | |
1200 | ||
1201 | npages = (data_len + (PAGE_SIZE - 1)) >> PAGE_SHIFT; | |
1202 | skb->truesize += data_len; | |
1203 | skb_shinfo(skb)->nr_frags = npages; | |
1204 | for (i = 0; i < npages; i++) { | |
1205 | struct page *page; | |
1206 | skb_frag_t *frag; | |
1207 | ||
1208 | page = alloc_pages(sk->sk_allocation, 0); | |
1209 | if (!page) { | |
1210 | err = -ENOBUFS; | |
1211 | skb_shinfo(skb)->nr_frags = i; | |
1212 | kfree_skb(skb); | |
1213 | goto failure; | |
1214 | } | |
1215 | ||
1216 | frag = &skb_shinfo(skb)->frags[i]; | |
1217 | frag->page = page; | |
1218 | frag->page_offset = 0; | |
1219 | frag->size = (data_len >= PAGE_SIZE ? | |
1220 | PAGE_SIZE : | |
1221 | data_len); | |
1222 | data_len -= PAGE_SIZE; | |
1223 | } | |
1224 | ||
1225 | /* Full success... */ | |
1226 | break; | |
1227 | } | |
1228 | err = -ENOBUFS; | |
1229 | goto failure; | |
1230 | } | |
1231 | set_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags); | |
1232 | set_bit(SOCK_NOSPACE, &sk->sk_socket->flags); | |
1233 | err = -EAGAIN; | |
1234 | if (!timeo) | |
1235 | goto failure; | |
1236 | if (signal_pending(current)) | |
1237 | goto interrupted; | |
1238 | timeo = sock_wait_for_wmem(sk, timeo); | |
1239 | } | |
1240 | ||
1241 | skb_set_owner_w(skb, sk); | |
1242 | return skb; | |
1243 | ||
1244 | interrupted: | |
1245 | err = sock_intr_errno(timeo); | |
1246 | failure: | |
1247 | *errcode = err; | |
1248 | return NULL; | |
1249 | } | |
1250 | ||
4ec93edb | 1251 | struct sk_buff *sock_alloc_send_skb(struct sock *sk, unsigned long size, |
1da177e4 LT |
1252 | int noblock, int *errcode) |
1253 | { | |
1254 | return sock_alloc_send_pskb(sk, size, 0, noblock, errcode); | |
1255 | } | |
1256 | ||
1257 | static void __lock_sock(struct sock *sk) | |
1258 | { | |
1259 | DEFINE_WAIT(wait); | |
1260 | ||
e71a4783 | 1261 | for (;;) { |
1da177e4 LT |
1262 | prepare_to_wait_exclusive(&sk->sk_lock.wq, &wait, |
1263 | TASK_UNINTERRUPTIBLE); | |
1264 | spin_unlock_bh(&sk->sk_lock.slock); | |
1265 | schedule(); | |
1266 | spin_lock_bh(&sk->sk_lock.slock); | |
e71a4783 | 1267 | if (!sock_owned_by_user(sk)) |
1da177e4 LT |
1268 | break; |
1269 | } | |
1270 | finish_wait(&sk->sk_lock.wq, &wait); | |
1271 | } | |
1272 | ||
1273 | static void __release_sock(struct sock *sk) | |
1274 | { | |
1275 | struct sk_buff *skb = sk->sk_backlog.head; | |
1276 | ||
1277 | do { | |
1278 | sk->sk_backlog.head = sk->sk_backlog.tail = NULL; | |
1279 | bh_unlock_sock(sk); | |
1280 | ||
1281 | do { | |
1282 | struct sk_buff *next = skb->next; | |
1283 | ||
1284 | skb->next = NULL; | |
1285 | sk->sk_backlog_rcv(sk, skb); | |
1286 | ||
1287 | /* | |
1288 | * We are in process context here with softirqs | |
1289 | * disabled, use cond_resched_softirq() to preempt. | |
1290 | * This is safe to do because we've taken the backlog | |
1291 | * queue private: | |
1292 | */ | |
1293 | cond_resched_softirq(); | |
1294 | ||
1295 | skb = next; | |
1296 | } while (skb != NULL); | |
1297 | ||
1298 | bh_lock_sock(sk); | |
e71a4783 | 1299 | } while ((skb = sk->sk_backlog.head) != NULL); |
1da177e4 LT |
1300 | } |
1301 | ||
1302 | /** | |
1303 | * sk_wait_data - wait for data to arrive at sk_receive_queue | |
4dc3b16b PP |
1304 | * @sk: sock to wait on |
1305 | * @timeo: for how long | |
1da177e4 LT |
1306 | * |
1307 | * Now socket state including sk->sk_err is changed only under lock, | |
1308 | * hence we may omit checks after joining wait queue. | |
1309 | * We check receive queue before schedule() only as optimization; | |
1310 | * it is very likely that release_sock() added new data. | |
1311 | */ | |
1312 | int sk_wait_data(struct sock *sk, long *timeo) | |
1313 | { | |
1314 | int rc; | |
1315 | DEFINE_WAIT(wait); | |
1316 | ||
1317 | prepare_to_wait(sk->sk_sleep, &wait, TASK_INTERRUPTIBLE); | |
1318 | set_bit(SOCK_ASYNC_WAITDATA, &sk->sk_socket->flags); | |
1319 | rc = sk_wait_event(sk, timeo, !skb_queue_empty(&sk->sk_receive_queue)); | |
1320 | clear_bit(SOCK_ASYNC_WAITDATA, &sk->sk_socket->flags); | |
1321 | finish_wait(sk->sk_sleep, &wait); | |
1322 | return rc; | |
1323 | } | |
1324 | ||
1325 | EXPORT_SYMBOL(sk_wait_data); | |
1326 | ||
1327 | /* | |
1328 | * Set of default routines for initialising struct proto_ops when | |
1329 | * the protocol does not support a particular function. In certain | |
1330 | * cases where it makes no sense for a protocol to have a "do nothing" | |
1331 | * function, some default processing is provided. | |
1332 | */ | |
1333 | ||
1334 | int sock_no_bind(struct socket *sock, struct sockaddr *saddr, int len) | |
1335 | { | |
1336 | return -EOPNOTSUPP; | |
1337 | } | |
1338 | ||
4ec93edb | 1339 | int sock_no_connect(struct socket *sock, struct sockaddr *saddr, |
1da177e4 LT |
1340 | int len, int flags) |
1341 | { | |
1342 | return -EOPNOTSUPP; | |
1343 | } | |
1344 | ||
1345 | int sock_no_socketpair(struct socket *sock1, struct socket *sock2) | |
1346 | { | |
1347 | return -EOPNOTSUPP; | |
1348 | } | |
1349 | ||
1350 | int sock_no_accept(struct socket *sock, struct socket *newsock, int flags) | |
1351 | { | |
1352 | return -EOPNOTSUPP; | |
1353 | } | |
1354 | ||
4ec93edb | 1355 | int sock_no_getname(struct socket *sock, struct sockaddr *saddr, |
1da177e4 LT |
1356 | int *len, int peer) |
1357 | { | |
1358 | return -EOPNOTSUPP; | |
1359 | } | |
1360 | ||
1361 | unsigned int sock_no_poll(struct file * file, struct socket *sock, poll_table *pt) | |
1362 | { | |
1363 | return 0; | |
1364 | } | |
1365 | ||
1366 | int sock_no_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg) | |
1367 | { | |
1368 | return -EOPNOTSUPP; | |
1369 | } | |
1370 | ||
1371 | int sock_no_listen(struct socket *sock, int backlog) | |
1372 | { | |
1373 | return -EOPNOTSUPP; | |
1374 | } | |
1375 | ||
1376 | int sock_no_shutdown(struct socket *sock, int how) | |
1377 | { | |
1378 | return -EOPNOTSUPP; | |
1379 | } | |
1380 | ||
1381 | int sock_no_setsockopt(struct socket *sock, int level, int optname, | |
1382 | char __user *optval, int optlen) | |
1383 | { | |
1384 | return -EOPNOTSUPP; | |
1385 | } | |
1386 | ||
1387 | int sock_no_getsockopt(struct socket *sock, int level, int optname, | |
1388 | char __user *optval, int __user *optlen) | |
1389 | { | |
1390 | return -EOPNOTSUPP; | |
1391 | } | |
1392 | ||
1393 | int sock_no_sendmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *m, | |
1394 | size_t len) | |
1395 | { | |
1396 | return -EOPNOTSUPP; | |
1397 | } | |
1398 | ||
1399 | int sock_no_recvmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *m, | |
1400 | size_t len, int flags) | |
1401 | { | |
1402 | return -EOPNOTSUPP; | |
1403 | } | |
1404 | ||
1405 | int sock_no_mmap(struct file *file, struct socket *sock, struct vm_area_struct *vma) | |
1406 | { | |
1407 | /* Mirror missing mmap method error code */ | |
1408 | return -ENODEV; | |
1409 | } | |
1410 | ||
1411 | ssize_t sock_no_sendpage(struct socket *sock, struct page *page, int offset, size_t size, int flags) | |
1412 | { | |
1413 | ssize_t res; | |
1414 | struct msghdr msg = {.msg_flags = flags}; | |
1415 | struct kvec iov; | |
1416 | char *kaddr = kmap(page); | |
1417 | iov.iov_base = kaddr + offset; | |
1418 | iov.iov_len = size; | |
1419 | res = kernel_sendmsg(sock, &msg, &iov, 1, size); | |
1420 | kunmap(page); | |
1421 | return res; | |
1422 | } | |
1423 | ||
1424 | /* | |
1425 | * Default Socket Callbacks | |
1426 | */ | |
1427 | ||
1428 | static void sock_def_wakeup(struct sock *sk) | |
1429 | { | |
1430 | read_lock(&sk->sk_callback_lock); | |
1431 | if (sk->sk_sleep && waitqueue_active(sk->sk_sleep)) | |
1432 | wake_up_interruptible_all(sk->sk_sleep); | |
1433 | read_unlock(&sk->sk_callback_lock); | |
1434 | } | |
1435 | ||
1436 | static void sock_def_error_report(struct sock *sk) | |
1437 | { | |
1438 | read_lock(&sk->sk_callback_lock); | |
1439 | if (sk->sk_sleep && waitqueue_active(sk->sk_sleep)) | |
1440 | wake_up_interruptible(sk->sk_sleep); | |
4ec93edb | 1441 | sk_wake_async(sk,0,POLL_ERR); |
1da177e4 LT |
1442 | read_unlock(&sk->sk_callback_lock); |
1443 | } | |
1444 | ||
1445 | static void sock_def_readable(struct sock *sk, int len) | |
1446 | { | |
1447 | read_lock(&sk->sk_callback_lock); | |
1448 | if (sk->sk_sleep && waitqueue_active(sk->sk_sleep)) | |
1449 | wake_up_interruptible(sk->sk_sleep); | |
1450 | sk_wake_async(sk,1,POLL_IN); | |
1451 | read_unlock(&sk->sk_callback_lock); | |
1452 | } | |
1453 | ||
1454 | static void sock_def_write_space(struct sock *sk) | |
1455 | { | |
1456 | read_lock(&sk->sk_callback_lock); | |
1457 | ||
1458 | /* Do not wake up a writer until he can make "significant" | |
1459 | * progress. --DaveM | |
1460 | */ | |
e71a4783 | 1461 | if ((atomic_read(&sk->sk_wmem_alloc) << 1) <= sk->sk_sndbuf) { |
1da177e4 LT |
1462 | if (sk->sk_sleep && waitqueue_active(sk->sk_sleep)) |
1463 | wake_up_interruptible(sk->sk_sleep); | |
1464 | ||
1465 | /* Should agree with poll, otherwise some programs break */ | |
1466 | if (sock_writeable(sk)) | |
1467 | sk_wake_async(sk, 2, POLL_OUT); | |
1468 | } | |
1469 | ||
1470 | read_unlock(&sk->sk_callback_lock); | |
1471 | } | |
1472 | ||
1473 | static void sock_def_destruct(struct sock *sk) | |
1474 | { | |
a51482bd | 1475 | kfree(sk->sk_protinfo); |
1da177e4 LT |
1476 | } |
1477 | ||
1478 | void sk_send_sigurg(struct sock *sk) | |
1479 | { | |
1480 | if (sk->sk_socket && sk->sk_socket->file) | |
1481 | if (send_sigurg(&sk->sk_socket->file->f_owner)) | |
1482 | sk_wake_async(sk, 3, POLL_PRI); | |
1483 | } | |
1484 | ||
1485 | void sk_reset_timer(struct sock *sk, struct timer_list* timer, | |
1486 | unsigned long expires) | |
1487 | { | |
1488 | if (!mod_timer(timer, expires)) | |
1489 | sock_hold(sk); | |
1490 | } | |
1491 | ||
1492 | EXPORT_SYMBOL(sk_reset_timer); | |
1493 | ||
1494 | void sk_stop_timer(struct sock *sk, struct timer_list* timer) | |
1495 | { | |
1496 | if (timer_pending(timer) && del_timer(timer)) | |
1497 | __sock_put(sk); | |
1498 | } | |
1499 | ||
1500 | EXPORT_SYMBOL(sk_stop_timer); | |
1501 | ||
1502 | void sock_init_data(struct socket *sock, struct sock *sk) | |
1503 | { | |
1504 | skb_queue_head_init(&sk->sk_receive_queue); | |
1505 | skb_queue_head_init(&sk->sk_write_queue); | |
1506 | skb_queue_head_init(&sk->sk_error_queue); | |
97fc2f08 CL |
1507 | #ifdef CONFIG_NET_DMA |
1508 | skb_queue_head_init(&sk->sk_async_wait_queue); | |
1509 | #endif | |
1da177e4 LT |
1510 | |
1511 | sk->sk_send_head = NULL; | |
1512 | ||
1513 | init_timer(&sk->sk_timer); | |
4ec93edb | 1514 | |
1da177e4 LT |
1515 | sk->sk_allocation = GFP_KERNEL; |
1516 | sk->sk_rcvbuf = sysctl_rmem_default; | |
1517 | sk->sk_sndbuf = sysctl_wmem_default; | |
1518 | sk->sk_state = TCP_CLOSE; | |
1519 | sk->sk_socket = sock; | |
1520 | ||
1521 | sock_set_flag(sk, SOCK_ZAPPED); | |
1522 | ||
e71a4783 | 1523 | if (sock) { |
1da177e4 LT |
1524 | sk->sk_type = sock->type; |
1525 | sk->sk_sleep = &sock->wait; | |
1526 | sock->sk = sk; | |
1527 | } else | |
1528 | sk->sk_sleep = NULL; | |
1529 | ||
1530 | rwlock_init(&sk->sk_dst_lock); | |
1531 | rwlock_init(&sk->sk_callback_lock); | |
da21f24d IM |
1532 | lockdep_set_class(&sk->sk_callback_lock, |
1533 | af_callback_keys + sk->sk_family); | |
1da177e4 LT |
1534 | |
1535 | sk->sk_state_change = sock_def_wakeup; | |
1536 | sk->sk_data_ready = sock_def_readable; | |
1537 | sk->sk_write_space = sock_def_write_space; | |
1538 | sk->sk_error_report = sock_def_error_report; | |
1539 | sk->sk_destruct = sock_def_destruct; | |
1540 | ||
1541 | sk->sk_sndmsg_page = NULL; | |
1542 | sk->sk_sndmsg_off = 0; | |
1543 | ||
1544 | sk->sk_peercred.pid = 0; | |
1545 | sk->sk_peercred.uid = -1; | |
1546 | sk->sk_peercred.gid = -1; | |
1547 | sk->sk_write_pending = 0; | |
1548 | sk->sk_rcvlowat = 1; | |
1549 | sk->sk_rcvtimeo = MAX_SCHEDULE_TIMEOUT; | |
1550 | sk->sk_sndtimeo = MAX_SCHEDULE_TIMEOUT; | |
1551 | ||
b7aa0bf7 | 1552 | sk->sk_stamp = ktime_set(-1L, -1L); |
1da177e4 LT |
1553 | |
1554 | atomic_set(&sk->sk_refcnt, 1); | |
1555 | } | |
1556 | ||
fcc70d5f | 1557 | void fastcall lock_sock_nested(struct sock *sk, int subclass) |
1da177e4 LT |
1558 | { |
1559 | might_sleep(); | |
a5b5bb9a | 1560 | spin_lock_bh(&sk->sk_lock.slock); |
1da177e4 LT |
1561 | if (sk->sk_lock.owner) |
1562 | __lock_sock(sk); | |
1563 | sk->sk_lock.owner = (void *)1; | |
a5b5bb9a IM |
1564 | spin_unlock(&sk->sk_lock.slock); |
1565 | /* | |
1566 | * The sk_lock has mutex_lock() semantics here: | |
1567 | */ | |
fcc70d5f | 1568 | mutex_acquire(&sk->sk_lock.dep_map, subclass, 0, _RET_IP_); |
a5b5bb9a | 1569 | local_bh_enable(); |
1da177e4 LT |
1570 | } |
1571 | ||
fcc70d5f | 1572 | EXPORT_SYMBOL(lock_sock_nested); |
1da177e4 LT |
1573 | |
1574 | void fastcall release_sock(struct sock *sk) | |
1575 | { | |
a5b5bb9a IM |
1576 | /* |
1577 | * The sk_lock has mutex_unlock() semantics: | |
1578 | */ | |
1579 | mutex_release(&sk->sk_lock.dep_map, 1, _RET_IP_); | |
1580 | ||
1581 | spin_lock_bh(&sk->sk_lock.slock); | |
1da177e4 LT |
1582 | if (sk->sk_backlog.tail) |
1583 | __release_sock(sk); | |
1584 | sk->sk_lock.owner = NULL; | |
a5b5bb9a IM |
1585 | if (waitqueue_active(&sk->sk_lock.wq)) |
1586 | wake_up(&sk->sk_lock.wq); | |
1587 | spin_unlock_bh(&sk->sk_lock.slock); | |
1da177e4 LT |
1588 | } |
1589 | EXPORT_SYMBOL(release_sock); | |
1590 | ||
1591 | int sock_get_timestamp(struct sock *sk, struct timeval __user *userstamp) | |
4ec93edb | 1592 | { |
b7aa0bf7 | 1593 | struct timeval tv; |
1da177e4 LT |
1594 | if (!sock_flag(sk, SOCK_TIMESTAMP)) |
1595 | sock_enable_timestamp(sk); | |
b7aa0bf7 ED |
1596 | tv = ktime_to_timeval(sk->sk_stamp); |
1597 | if (tv.tv_sec == -1) | |
1da177e4 | 1598 | return -ENOENT; |
b7aa0bf7 ED |
1599 | if (tv.tv_sec == 0) { |
1600 | sk->sk_stamp = ktime_get_real(); | |
1601 | tv = ktime_to_timeval(sk->sk_stamp); | |
1602 | } | |
1603 | return copy_to_user(userstamp, &tv, sizeof(tv)) ? -EFAULT : 0; | |
4ec93edb | 1604 | } |
1da177e4 LT |
1605 | EXPORT_SYMBOL(sock_get_timestamp); |
1606 | ||
ae40eb1e ED |
1607 | int sock_get_timestampns(struct sock *sk, struct timespec __user *userstamp) |
1608 | { | |
1609 | struct timespec ts; | |
1610 | if (!sock_flag(sk, SOCK_TIMESTAMP)) | |
1611 | sock_enable_timestamp(sk); | |
1612 | ts = ktime_to_timespec(sk->sk_stamp); | |
1613 | if (ts.tv_sec == -1) | |
1614 | return -ENOENT; | |
1615 | if (ts.tv_sec == 0) { | |
1616 | sk->sk_stamp = ktime_get_real(); | |
1617 | ts = ktime_to_timespec(sk->sk_stamp); | |
1618 | } | |
1619 | return copy_to_user(userstamp, &ts, sizeof(ts)) ? -EFAULT : 0; | |
1620 | } | |
1621 | EXPORT_SYMBOL(sock_get_timestampns); | |
1622 | ||
1da177e4 | 1623 | void sock_enable_timestamp(struct sock *sk) |
4ec93edb YH |
1624 | { |
1625 | if (!sock_flag(sk, SOCK_TIMESTAMP)) { | |
1da177e4 LT |
1626 | sock_set_flag(sk, SOCK_TIMESTAMP); |
1627 | net_enable_timestamp(); | |
1628 | } | |
1629 | } | |
4ec93edb | 1630 | EXPORT_SYMBOL(sock_enable_timestamp); |
1da177e4 LT |
1631 | |
1632 | /* | |
1633 | * Get a socket option on an socket. | |
1634 | * | |
1635 | * FIX: POSIX 1003.1g is very ambiguous here. It states that | |
1636 | * asynchronous errors should be reported by getsockopt. We assume | |
1637 | * this means if you specify SO_ERROR (otherwise whats the point of it). | |
1638 | */ | |
1639 | int sock_common_getsockopt(struct socket *sock, int level, int optname, | |
1640 | char __user *optval, int __user *optlen) | |
1641 | { | |
1642 | struct sock *sk = sock->sk; | |
1643 | ||
1644 | return sk->sk_prot->getsockopt(sk, level, optname, optval, optlen); | |
1645 | } | |
1646 | ||
1647 | EXPORT_SYMBOL(sock_common_getsockopt); | |
1648 | ||
3fdadf7d | 1649 | #ifdef CONFIG_COMPAT |
543d9cfe ACM |
1650 | int compat_sock_common_getsockopt(struct socket *sock, int level, int optname, |
1651 | char __user *optval, int __user *optlen) | |
3fdadf7d DM |
1652 | { |
1653 | struct sock *sk = sock->sk; | |
1654 | ||
1e51f951 | 1655 | if (sk->sk_prot->compat_getsockopt != NULL) |
543d9cfe ACM |
1656 | return sk->sk_prot->compat_getsockopt(sk, level, optname, |
1657 | optval, optlen); | |
3fdadf7d DM |
1658 | return sk->sk_prot->getsockopt(sk, level, optname, optval, optlen); |
1659 | } | |
1660 | EXPORT_SYMBOL(compat_sock_common_getsockopt); | |
1661 | #endif | |
1662 | ||
1da177e4 LT |
1663 | int sock_common_recvmsg(struct kiocb *iocb, struct socket *sock, |
1664 | struct msghdr *msg, size_t size, int flags) | |
1665 | { | |
1666 | struct sock *sk = sock->sk; | |
1667 | int addr_len = 0; | |
1668 | int err; | |
1669 | ||
1670 | err = sk->sk_prot->recvmsg(iocb, sk, msg, size, flags & MSG_DONTWAIT, | |
1671 | flags & ~MSG_DONTWAIT, &addr_len); | |
1672 | if (err >= 0) | |
1673 | msg->msg_namelen = addr_len; | |
1674 | return err; | |
1675 | } | |
1676 | ||
1677 | EXPORT_SYMBOL(sock_common_recvmsg); | |
1678 | ||
1679 | /* | |
1680 | * Set socket options on an inet socket. | |
1681 | */ | |
1682 | int sock_common_setsockopt(struct socket *sock, int level, int optname, | |
1683 | char __user *optval, int optlen) | |
1684 | { | |
1685 | struct sock *sk = sock->sk; | |
1686 | ||
1687 | return sk->sk_prot->setsockopt(sk, level, optname, optval, optlen); | |
1688 | } | |
1689 | ||
1690 | EXPORT_SYMBOL(sock_common_setsockopt); | |
1691 | ||
3fdadf7d | 1692 | #ifdef CONFIG_COMPAT |
543d9cfe ACM |
1693 | int compat_sock_common_setsockopt(struct socket *sock, int level, int optname, |
1694 | char __user *optval, int optlen) | |
3fdadf7d DM |
1695 | { |
1696 | struct sock *sk = sock->sk; | |
1697 | ||
543d9cfe ACM |
1698 | if (sk->sk_prot->compat_setsockopt != NULL) |
1699 | return sk->sk_prot->compat_setsockopt(sk, level, optname, | |
1700 | optval, optlen); | |
3fdadf7d DM |
1701 | return sk->sk_prot->setsockopt(sk, level, optname, optval, optlen); |
1702 | } | |
1703 | EXPORT_SYMBOL(compat_sock_common_setsockopt); | |
1704 | #endif | |
1705 | ||
1da177e4 LT |
1706 | void sk_common_release(struct sock *sk) |
1707 | { | |
1708 | if (sk->sk_prot->destroy) | |
1709 | sk->sk_prot->destroy(sk); | |
1710 | ||
1711 | /* | |
1712 | * Observation: when sock_common_release is called, processes have | |
1713 | * no access to socket. But net still has. | |
1714 | * Step one, detach it from networking: | |
1715 | * | |
1716 | * A. Remove from hash tables. | |
1717 | */ | |
1718 | ||
1719 | sk->sk_prot->unhash(sk); | |
1720 | ||
1721 | /* | |
1722 | * In this point socket cannot receive new packets, but it is possible | |
1723 | * that some packets are in flight because some CPU runs receiver and | |
1724 | * did hash table lookup before we unhashed socket. They will achieve | |
1725 | * receive queue and will be purged by socket destructor. | |
1726 | * | |
1727 | * Also we still have packets pending on receive queue and probably, | |
1728 | * our own packets waiting in device queues. sock_destroy will drain | |
1729 | * receive queue, but transmitted packets will delay socket destruction | |
1730 | * until the last reference will be released. | |
1731 | */ | |
1732 | ||
1733 | sock_orphan(sk); | |
1734 | ||
1735 | xfrm_sk_free_policy(sk); | |
1736 | ||
e6848976 | 1737 | sk_refcnt_debug_release(sk); |
1da177e4 LT |
1738 | sock_put(sk); |
1739 | } | |
1740 | ||
1741 | EXPORT_SYMBOL(sk_common_release); | |
1742 | ||
1743 | static DEFINE_RWLOCK(proto_list_lock); | |
1744 | static LIST_HEAD(proto_list); | |
1745 | ||
1746 | int proto_register(struct proto *prot, int alloc_slab) | |
1747 | { | |
8feaf0c0 ACM |
1748 | char *request_sock_slab_name = NULL; |
1749 | char *timewait_sock_slab_name; | |
1da177e4 LT |
1750 | int rc = -ENOBUFS; |
1751 | ||
1da177e4 LT |
1752 | if (alloc_slab) { |
1753 | prot->slab = kmem_cache_create(prot->name, prot->obj_size, 0, | |
1754 | SLAB_HWCACHE_ALIGN, NULL, NULL); | |
1755 | ||
1756 | if (prot->slab == NULL) { | |
1757 | printk(KERN_CRIT "%s: Can't create sock SLAB cache!\n", | |
1758 | prot->name); | |
2a278051 | 1759 | goto out; |
1da177e4 | 1760 | } |
2e6599cb ACM |
1761 | |
1762 | if (prot->rsk_prot != NULL) { | |
1763 | static const char mask[] = "request_sock_%s"; | |
1764 | ||
1765 | request_sock_slab_name = kmalloc(strlen(prot->name) + sizeof(mask) - 1, GFP_KERNEL); | |
1766 | if (request_sock_slab_name == NULL) | |
1767 | goto out_free_sock_slab; | |
1768 | ||
1769 | sprintf(request_sock_slab_name, mask, prot->name); | |
1770 | prot->rsk_prot->slab = kmem_cache_create(request_sock_slab_name, | |
1771 | prot->rsk_prot->obj_size, 0, | |
1772 | SLAB_HWCACHE_ALIGN, NULL, NULL); | |
1773 | ||
1774 | if (prot->rsk_prot->slab == NULL) { | |
1775 | printk(KERN_CRIT "%s: Can't create request sock SLAB cache!\n", | |
1776 | prot->name); | |
1777 | goto out_free_request_sock_slab_name; | |
1778 | } | |
1779 | } | |
8feaf0c0 | 1780 | |
6d6ee43e | 1781 | if (prot->twsk_prot != NULL) { |
8feaf0c0 ACM |
1782 | static const char mask[] = "tw_sock_%s"; |
1783 | ||
1784 | timewait_sock_slab_name = kmalloc(strlen(prot->name) + sizeof(mask) - 1, GFP_KERNEL); | |
1785 | ||
1786 | if (timewait_sock_slab_name == NULL) | |
1787 | goto out_free_request_sock_slab; | |
1788 | ||
1789 | sprintf(timewait_sock_slab_name, mask, prot->name); | |
6d6ee43e ACM |
1790 | prot->twsk_prot->twsk_slab = |
1791 | kmem_cache_create(timewait_sock_slab_name, | |
1792 | prot->twsk_prot->twsk_obj_size, | |
1793 | 0, SLAB_HWCACHE_ALIGN, | |
1794 | NULL, NULL); | |
1795 | if (prot->twsk_prot->twsk_slab == NULL) | |
8feaf0c0 ACM |
1796 | goto out_free_timewait_sock_slab_name; |
1797 | } | |
1da177e4 LT |
1798 | } |
1799 | ||
2a278051 | 1800 | write_lock(&proto_list_lock); |
1da177e4 | 1801 | list_add(&prot->node, &proto_list); |
1da177e4 | 1802 | write_unlock(&proto_list_lock); |
2a278051 ACM |
1803 | rc = 0; |
1804 | out: | |
1da177e4 | 1805 | return rc; |
8feaf0c0 ACM |
1806 | out_free_timewait_sock_slab_name: |
1807 | kfree(timewait_sock_slab_name); | |
1808 | out_free_request_sock_slab: | |
1809 | if (prot->rsk_prot && prot->rsk_prot->slab) { | |
1810 | kmem_cache_destroy(prot->rsk_prot->slab); | |
1811 | prot->rsk_prot->slab = NULL; | |
1812 | } | |
2e6599cb ACM |
1813 | out_free_request_sock_slab_name: |
1814 | kfree(request_sock_slab_name); | |
1815 | out_free_sock_slab: | |
1816 | kmem_cache_destroy(prot->slab); | |
1817 | prot->slab = NULL; | |
1818 | goto out; | |
1da177e4 LT |
1819 | } |
1820 | ||
1821 | EXPORT_SYMBOL(proto_register); | |
1822 | ||
1823 | void proto_unregister(struct proto *prot) | |
1824 | { | |
1825 | write_lock(&proto_list_lock); | |
0a3f4358 PM |
1826 | list_del(&prot->node); |
1827 | write_unlock(&proto_list_lock); | |
1da177e4 LT |
1828 | |
1829 | if (prot->slab != NULL) { | |
1830 | kmem_cache_destroy(prot->slab); | |
1831 | prot->slab = NULL; | |
1832 | } | |
1833 | ||
2e6599cb ACM |
1834 | if (prot->rsk_prot != NULL && prot->rsk_prot->slab != NULL) { |
1835 | const char *name = kmem_cache_name(prot->rsk_prot->slab); | |
1836 | ||
1837 | kmem_cache_destroy(prot->rsk_prot->slab); | |
1838 | kfree(name); | |
1839 | prot->rsk_prot->slab = NULL; | |
1840 | } | |
1841 | ||
6d6ee43e ACM |
1842 | if (prot->twsk_prot != NULL && prot->twsk_prot->twsk_slab != NULL) { |
1843 | const char *name = kmem_cache_name(prot->twsk_prot->twsk_slab); | |
8feaf0c0 | 1844 | |
6d6ee43e | 1845 | kmem_cache_destroy(prot->twsk_prot->twsk_slab); |
8feaf0c0 | 1846 | kfree(name); |
6d6ee43e | 1847 | prot->twsk_prot->twsk_slab = NULL; |
8feaf0c0 | 1848 | } |
1da177e4 LT |
1849 | } |
1850 | ||
1851 | EXPORT_SYMBOL(proto_unregister); | |
1852 | ||
1853 | #ifdef CONFIG_PROC_FS | |
1da177e4 LT |
1854 | static void *proto_seq_start(struct seq_file *seq, loff_t *pos) |
1855 | { | |
1856 | read_lock(&proto_list_lock); | |
60f0438a | 1857 | return seq_list_start_head(&proto_list, *pos); |
1da177e4 LT |
1858 | } |
1859 | ||
1860 | static void *proto_seq_next(struct seq_file *seq, void *v, loff_t *pos) | |
1861 | { | |
60f0438a | 1862 | return seq_list_next(v, &proto_list, pos); |
1da177e4 LT |
1863 | } |
1864 | ||
1865 | static void proto_seq_stop(struct seq_file *seq, void *v) | |
1866 | { | |
1867 | read_unlock(&proto_list_lock); | |
1868 | } | |
1869 | ||
1870 | static char proto_method_implemented(const void *method) | |
1871 | { | |
1872 | return method == NULL ? 'n' : 'y'; | |
1873 | } | |
1874 | ||
1875 | static void proto_seq_printf(struct seq_file *seq, struct proto *proto) | |
1876 | { | |
1877 | seq_printf(seq, "%-9s %4u %6d %6d %-3s %6u %-3s %-10s " | |
1878 | "%2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c\n", | |
1879 | proto->name, | |
1880 | proto->obj_size, | |
1881 | proto->sockets_allocated != NULL ? atomic_read(proto->sockets_allocated) : -1, | |
1882 | proto->memory_allocated != NULL ? atomic_read(proto->memory_allocated) : -1, | |
1883 | proto->memory_pressure != NULL ? *proto->memory_pressure ? "yes" : "no" : "NI", | |
1884 | proto->max_header, | |
1885 | proto->slab == NULL ? "no" : "yes", | |
1886 | module_name(proto->owner), | |
1887 | proto_method_implemented(proto->close), | |
1888 | proto_method_implemented(proto->connect), | |
1889 | proto_method_implemented(proto->disconnect), | |
1890 | proto_method_implemented(proto->accept), | |
1891 | proto_method_implemented(proto->ioctl), | |
1892 | proto_method_implemented(proto->init), | |
1893 | proto_method_implemented(proto->destroy), | |
1894 | proto_method_implemented(proto->shutdown), | |
1895 | proto_method_implemented(proto->setsockopt), | |
1896 | proto_method_implemented(proto->getsockopt), | |
1897 | proto_method_implemented(proto->sendmsg), | |
1898 | proto_method_implemented(proto->recvmsg), | |
1899 | proto_method_implemented(proto->sendpage), | |
1900 | proto_method_implemented(proto->bind), | |
1901 | proto_method_implemented(proto->backlog_rcv), | |
1902 | proto_method_implemented(proto->hash), | |
1903 | proto_method_implemented(proto->unhash), | |
1904 | proto_method_implemented(proto->get_port), | |
1905 | proto_method_implemented(proto->enter_memory_pressure)); | |
1906 | } | |
1907 | ||
1908 | static int proto_seq_show(struct seq_file *seq, void *v) | |
1909 | { | |
60f0438a | 1910 | if (v == &proto_list) |
1da177e4 LT |
1911 | seq_printf(seq, "%-9s %-4s %-8s %-6s %-5s %-7s %-4s %-10s %s", |
1912 | "protocol", | |
1913 | "size", | |
1914 | "sockets", | |
1915 | "memory", | |
1916 | "press", | |
1917 | "maxhdr", | |
1918 | "slab", | |
1919 | "module", | |
1920 | "cl co di ac io in de sh ss gs se re sp bi br ha uh gp em\n"); | |
1921 | else | |
60f0438a | 1922 | proto_seq_printf(seq, list_entry(v, struct proto, node)); |
1da177e4 LT |
1923 | return 0; |
1924 | } | |
1925 | ||
f690808e | 1926 | static const struct seq_operations proto_seq_ops = { |
1da177e4 LT |
1927 | .start = proto_seq_start, |
1928 | .next = proto_seq_next, | |
1929 | .stop = proto_seq_stop, | |
1930 | .show = proto_seq_show, | |
1931 | }; | |
1932 | ||
1933 | static int proto_seq_open(struct inode *inode, struct file *file) | |
1934 | { | |
1935 | return seq_open(file, &proto_seq_ops); | |
1936 | } | |
1937 | ||
9a32144e | 1938 | static const struct file_operations proto_seq_fops = { |
1da177e4 LT |
1939 | .owner = THIS_MODULE, |
1940 | .open = proto_seq_open, | |
1941 | .read = seq_read, | |
1942 | .llseek = seq_lseek, | |
1943 | .release = seq_release, | |
1944 | }; | |
1945 | ||
1946 | static int __init proto_init(void) | |
1947 | { | |
1948 | /* register /proc/net/protocols */ | |
1949 | return proc_net_fops_create("protocols", S_IRUGO, &proto_seq_fops) == NULL ? -ENOBUFS : 0; | |
1950 | } | |
1951 | ||
1952 | subsys_initcall(proto_init); | |
1953 | ||
1954 | #endif /* PROC_FS */ | |
1955 | ||
1956 | EXPORT_SYMBOL(sk_alloc); | |
1957 | EXPORT_SYMBOL(sk_free); | |
1958 | EXPORT_SYMBOL(sk_send_sigurg); | |
1959 | EXPORT_SYMBOL(sock_alloc_send_skb); | |
1960 | EXPORT_SYMBOL(sock_init_data); | |
1961 | EXPORT_SYMBOL(sock_kfree_s); | |
1962 | EXPORT_SYMBOL(sock_kmalloc); | |
1963 | EXPORT_SYMBOL(sock_no_accept); | |
1964 | EXPORT_SYMBOL(sock_no_bind); | |
1965 | EXPORT_SYMBOL(sock_no_connect); | |
1966 | EXPORT_SYMBOL(sock_no_getname); | |
1967 | EXPORT_SYMBOL(sock_no_getsockopt); | |
1968 | EXPORT_SYMBOL(sock_no_ioctl); | |
1969 | EXPORT_SYMBOL(sock_no_listen); | |
1970 | EXPORT_SYMBOL(sock_no_mmap); | |
1971 | EXPORT_SYMBOL(sock_no_poll); | |
1972 | EXPORT_SYMBOL(sock_no_recvmsg); | |
1973 | EXPORT_SYMBOL(sock_no_sendmsg); | |
1974 | EXPORT_SYMBOL(sock_no_sendpage); | |
1975 | EXPORT_SYMBOL(sock_no_setsockopt); | |
1976 | EXPORT_SYMBOL(sock_no_shutdown); | |
1977 | EXPORT_SYMBOL(sock_no_socketpair); | |
1978 | EXPORT_SYMBOL(sock_rfree); | |
1979 | EXPORT_SYMBOL(sock_setsockopt); | |
1980 | EXPORT_SYMBOL(sock_wfree); | |
1981 | EXPORT_SYMBOL(sock_wmalloc); | |
1982 | EXPORT_SYMBOL(sock_i_uid); | |
1983 | EXPORT_SYMBOL(sock_i_ino); | |
1da177e4 | 1984 | EXPORT_SYMBOL(sysctl_optmem_max); |
6baf1f41 | 1985 | #ifdef CONFIG_SYSCTL |
1da177e4 LT |
1986 | EXPORT_SYMBOL(sysctl_rmem_max); |
1987 | EXPORT_SYMBOL(sysctl_wmem_max); | |
1988 | #endif |