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" , | |
157 | "sk_lock-AF_TIPC" , "sk_lock-AF_BLUETOOTH", "sk_lock-AF_MAX" | |
158 | }; | |
159 | static const char *af_family_slock_key_strings[AF_MAX+1] = { | |
160 | "slock-AF_UNSPEC", "slock-AF_UNIX" , "slock-AF_INET" , | |
161 | "slock-AF_AX25" , "slock-AF_IPX" , "slock-AF_APPLETALK", | |
162 | "slock-AF_NETROM", "slock-AF_BRIDGE" , "slock-AF_ATMPVC" , | |
163 | "slock-AF_X25" , "slock-AF_INET6" , "slock-AF_ROSE" , | |
164 | "slock-AF_DECnet", "slock-AF_NETBEUI" , "slock-AF_SECURITY" , | |
165 | "slock-AF_KEY" , "slock-AF_NETLINK" , "slock-AF_PACKET" , | |
166 | "slock-AF_ASH" , "slock-AF_ECONET" , "slock-AF_ATMSVC" , | |
167 | "slock-21" , "slock-AF_SNA" , "slock-AF_IRDA" , | |
168 | "slock-AF_PPPOX" , "slock-AF_WANPIPE" , "slock-AF_LLC" , | |
169 | "slock-27" , "slock-28" , "slock-29" , | |
170 | "slock-AF_TIPC" , "slock-AF_BLUETOOTH", "slock-AF_MAX" | |
171 | }; | |
172 | #endif | |
da21f24d IM |
173 | |
174 | /* | |
175 | * sk_callback_lock locking rules are per-address-family, | |
176 | * so split the lock classes by using a per-AF key: | |
177 | */ | |
178 | static struct lock_class_key af_callback_keys[AF_MAX]; | |
179 | ||
1da177e4 LT |
180 | /* Take into consideration the size of the struct sk_buff overhead in the |
181 | * determination of these values, since that is non-constant across | |
182 | * platforms. This makes socket queueing behavior and performance | |
183 | * not depend upon such differences. | |
184 | */ | |
185 | #define _SK_MEM_PACKETS 256 | |
186 | #define _SK_MEM_OVERHEAD (sizeof(struct sk_buff) + 256) | |
187 | #define SK_WMEM_MAX (_SK_MEM_OVERHEAD * _SK_MEM_PACKETS) | |
188 | #define SK_RMEM_MAX (_SK_MEM_OVERHEAD * _SK_MEM_PACKETS) | |
189 | ||
190 | /* Run time adjustable parameters. */ | |
ab32ea5d BH |
191 | __u32 sysctl_wmem_max __read_mostly = SK_WMEM_MAX; |
192 | __u32 sysctl_rmem_max __read_mostly = SK_RMEM_MAX; | |
193 | __u32 sysctl_wmem_default __read_mostly = SK_WMEM_MAX; | |
194 | __u32 sysctl_rmem_default __read_mostly = SK_RMEM_MAX; | |
1da177e4 LT |
195 | |
196 | /* Maximal space eaten by iovec or ancilliary data plus some space */ | |
ab32ea5d | 197 | int sysctl_optmem_max __read_mostly = sizeof(unsigned long)*(2*UIO_MAXIOV+512); |
1da177e4 LT |
198 | |
199 | static int sock_set_timeout(long *timeo_p, char __user *optval, int optlen) | |
200 | { | |
201 | struct timeval tv; | |
202 | ||
203 | if (optlen < sizeof(tv)) | |
204 | return -EINVAL; | |
205 | if (copy_from_user(&tv, optval, sizeof(tv))) | |
206 | return -EFAULT; | |
207 | ||
208 | *timeo_p = MAX_SCHEDULE_TIMEOUT; | |
209 | if (tv.tv_sec == 0 && tv.tv_usec == 0) | |
210 | return 0; | |
211 | if (tv.tv_sec < (MAX_SCHEDULE_TIMEOUT/HZ - 1)) | |
212 | *timeo_p = tv.tv_sec*HZ + (tv.tv_usec+(1000000/HZ-1))/(1000000/HZ); | |
213 | return 0; | |
214 | } | |
215 | ||
216 | static void sock_warn_obsolete_bsdism(const char *name) | |
217 | { | |
218 | static int warned; | |
219 | static char warncomm[TASK_COMM_LEN]; | |
4ec93edb YH |
220 | if (strcmp(warncomm, current->comm) && warned < 5) { |
221 | strcpy(warncomm, current->comm); | |
1da177e4 LT |
222 | printk(KERN_WARNING "process `%s' is using obsolete " |
223 | "%s SO_BSDCOMPAT\n", warncomm, name); | |
224 | warned++; | |
225 | } | |
226 | } | |
227 | ||
228 | static void sock_disable_timestamp(struct sock *sk) | |
4ec93edb YH |
229 | { |
230 | if (sock_flag(sk, SOCK_TIMESTAMP)) { | |
1da177e4 LT |
231 | sock_reset_flag(sk, SOCK_TIMESTAMP); |
232 | net_disable_timestamp(); | |
233 | } | |
234 | } | |
235 | ||
236 | ||
f0088a50 DV |
237 | int sock_queue_rcv_skb(struct sock *sk, struct sk_buff *skb) |
238 | { | |
239 | int err = 0; | |
240 | int skb_len; | |
241 | ||
242 | /* Cast skb->rcvbuf to unsigned... It's pointless, but reduces | |
243 | number of warnings when compiling with -W --ANK | |
244 | */ | |
245 | if (atomic_read(&sk->sk_rmem_alloc) + skb->truesize >= | |
246 | (unsigned)sk->sk_rcvbuf) { | |
247 | err = -ENOMEM; | |
248 | goto out; | |
249 | } | |
250 | ||
fda9ef5d | 251 | err = sk_filter(sk, skb); |
f0088a50 DV |
252 | if (err) |
253 | goto out; | |
254 | ||
255 | skb->dev = NULL; | |
256 | skb_set_owner_r(skb, sk); | |
257 | ||
258 | /* Cache the SKB length before we tack it onto the receive | |
259 | * queue. Once it is added it no longer belongs to us and | |
260 | * may be freed by other threads of control pulling packets | |
261 | * from the queue. | |
262 | */ | |
263 | skb_len = skb->len; | |
264 | ||
265 | skb_queue_tail(&sk->sk_receive_queue, skb); | |
266 | ||
267 | if (!sock_flag(sk, SOCK_DEAD)) | |
268 | sk->sk_data_ready(sk, skb_len); | |
269 | out: | |
270 | return err; | |
271 | } | |
272 | EXPORT_SYMBOL(sock_queue_rcv_skb); | |
273 | ||
58a5a7b9 | 274 | int sk_receive_skb(struct sock *sk, struct sk_buff *skb, const int nested) |
f0088a50 DV |
275 | { |
276 | int rc = NET_RX_SUCCESS; | |
277 | ||
fda9ef5d | 278 | if (sk_filter(sk, skb)) |
f0088a50 DV |
279 | goto discard_and_relse; |
280 | ||
281 | skb->dev = NULL; | |
282 | ||
58a5a7b9 ACM |
283 | if (nested) |
284 | bh_lock_sock_nested(sk); | |
285 | else | |
286 | bh_lock_sock(sk); | |
a5b5bb9a IM |
287 | if (!sock_owned_by_user(sk)) { |
288 | /* | |
289 | * trylock + unlock semantics: | |
290 | */ | |
291 | mutex_acquire(&sk->sk_lock.dep_map, 0, 1, _RET_IP_); | |
292 | ||
f0088a50 | 293 | rc = sk->sk_backlog_rcv(sk, skb); |
a5b5bb9a IM |
294 | |
295 | mutex_release(&sk->sk_lock.dep_map, 1, _RET_IP_); | |
296 | } else | |
f0088a50 DV |
297 | sk_add_backlog(sk, skb); |
298 | bh_unlock_sock(sk); | |
299 | out: | |
300 | sock_put(sk); | |
301 | return rc; | |
302 | discard_and_relse: | |
303 | kfree_skb(skb); | |
304 | goto out; | |
305 | } | |
306 | EXPORT_SYMBOL(sk_receive_skb); | |
307 | ||
308 | struct dst_entry *__sk_dst_check(struct sock *sk, u32 cookie) | |
309 | { | |
310 | struct dst_entry *dst = sk->sk_dst_cache; | |
311 | ||
312 | if (dst && dst->obsolete && dst->ops->check(dst, cookie) == NULL) { | |
313 | sk->sk_dst_cache = NULL; | |
314 | dst_release(dst); | |
315 | return NULL; | |
316 | } | |
317 | ||
318 | return dst; | |
319 | } | |
320 | EXPORT_SYMBOL(__sk_dst_check); | |
321 | ||
322 | struct dst_entry *sk_dst_check(struct sock *sk, u32 cookie) | |
323 | { | |
324 | struct dst_entry *dst = sk_dst_get(sk); | |
325 | ||
326 | if (dst && dst->obsolete && dst->ops->check(dst, cookie) == NULL) { | |
327 | sk_dst_reset(sk); | |
328 | dst_release(dst); | |
329 | return NULL; | |
330 | } | |
331 | ||
332 | return dst; | |
333 | } | |
334 | EXPORT_SYMBOL(sk_dst_check); | |
335 | ||
1da177e4 LT |
336 | /* |
337 | * This is meant for all protocols to use and covers goings on | |
338 | * at the socket level. Everything here is generic. | |
339 | */ | |
340 | ||
341 | int sock_setsockopt(struct socket *sock, int level, int optname, | |
342 | char __user *optval, int optlen) | |
343 | { | |
344 | struct sock *sk=sock->sk; | |
345 | struct sk_filter *filter; | |
346 | int val; | |
347 | int valbool; | |
348 | struct linger ling; | |
349 | int ret = 0; | |
4ec93edb | 350 | |
1da177e4 LT |
351 | /* |
352 | * Options without arguments | |
353 | */ | |
354 | ||
355 | #ifdef SO_DONTLINGER /* Compatibility item... */ | |
a77be819 KM |
356 | if (optname == SO_DONTLINGER) { |
357 | lock_sock(sk); | |
358 | sock_reset_flag(sk, SOCK_LINGER); | |
359 | release_sock(sk); | |
360 | return 0; | |
1da177e4 | 361 | } |
a77be819 | 362 | #endif |
4ec93edb YH |
363 | |
364 | if(optlen<sizeof(int)) | |
365 | return(-EINVAL); | |
366 | ||
1da177e4 LT |
367 | if (get_user(val, (int __user *)optval)) |
368 | return -EFAULT; | |
4ec93edb YH |
369 | |
370 | valbool = val?1:0; | |
1da177e4 LT |
371 | |
372 | lock_sock(sk); | |
373 | ||
4ec93edb YH |
374 | switch(optname) |
375 | { | |
376 | case SO_DEBUG: | |
1da177e4 LT |
377 | if(val && !capable(CAP_NET_ADMIN)) |
378 | { | |
379 | ret = -EACCES; | |
380 | } | |
381 | else if (valbool) | |
382 | sock_set_flag(sk, SOCK_DBG); | |
383 | else | |
384 | sock_reset_flag(sk, SOCK_DBG); | |
385 | break; | |
386 | case SO_REUSEADDR: | |
387 | sk->sk_reuse = valbool; | |
388 | break; | |
389 | case SO_TYPE: | |
390 | case SO_ERROR: | |
391 | ret = -ENOPROTOOPT; | |
4ec93edb | 392 | break; |
1da177e4 LT |
393 | case SO_DONTROUTE: |
394 | if (valbool) | |
395 | sock_set_flag(sk, SOCK_LOCALROUTE); | |
396 | else | |
397 | sock_reset_flag(sk, SOCK_LOCALROUTE); | |
398 | break; | |
399 | case SO_BROADCAST: | |
400 | sock_valbool_flag(sk, SOCK_BROADCAST, valbool); | |
401 | break; | |
402 | case SO_SNDBUF: | |
403 | /* Don't error on this BSD doesn't and if you think | |
404 | about it this is right. Otherwise apps have to | |
405 | play 'guess the biggest size' games. RCVBUF/SNDBUF | |
406 | are treated in BSD as hints */ | |
4ec93edb | 407 | |
1da177e4 LT |
408 | if (val > sysctl_wmem_max) |
409 | val = sysctl_wmem_max; | |
b0573dea | 410 | set_sndbuf: |
1da177e4 LT |
411 | sk->sk_userlocks |= SOCK_SNDBUF_LOCK; |
412 | if ((val * 2) < SOCK_MIN_SNDBUF) | |
413 | sk->sk_sndbuf = SOCK_MIN_SNDBUF; | |
414 | else | |
415 | sk->sk_sndbuf = val * 2; | |
416 | ||
417 | /* | |
418 | * Wake up sending tasks if we | |
419 | * upped the value. | |
420 | */ | |
421 | sk->sk_write_space(sk); | |
422 | break; | |
423 | ||
b0573dea PM |
424 | case SO_SNDBUFFORCE: |
425 | if (!capable(CAP_NET_ADMIN)) { | |
426 | ret = -EPERM; | |
427 | break; | |
428 | } | |
429 | goto set_sndbuf; | |
430 | ||
1da177e4 LT |
431 | case SO_RCVBUF: |
432 | /* Don't error on this BSD doesn't and if you think | |
433 | about it this is right. Otherwise apps have to | |
434 | play 'guess the biggest size' games. RCVBUF/SNDBUF | |
435 | are treated in BSD as hints */ | |
4ec93edb | 436 | |
1da177e4 LT |
437 | if (val > sysctl_rmem_max) |
438 | val = sysctl_rmem_max; | |
b0573dea | 439 | set_rcvbuf: |
1da177e4 | 440 | sk->sk_userlocks |= SOCK_RCVBUF_LOCK; |
c08e4961 AM |
441 | /* |
442 | * We double it on the way in to account for | |
443 | * "struct sk_buff" etc. overhead. Applications | |
444 | * assume that the SO_RCVBUF setting they make will | |
445 | * allow that much actual data to be received on that | |
446 | * socket. | |
447 | * | |
448 | * Applications are unaware that "struct sk_buff" and | |
449 | * other overheads allocate from the receive buffer | |
450 | * during socket buffer allocation. | |
451 | * | |
452 | * And after considering the possible alternatives, | |
453 | * returning the value we actually used in getsockopt | |
454 | * is the most desirable behavior. | |
455 | */ | |
1da177e4 LT |
456 | if ((val * 2) < SOCK_MIN_RCVBUF) |
457 | sk->sk_rcvbuf = SOCK_MIN_RCVBUF; | |
458 | else | |
459 | sk->sk_rcvbuf = val * 2; | |
460 | break; | |
461 | ||
b0573dea PM |
462 | case SO_RCVBUFFORCE: |
463 | if (!capable(CAP_NET_ADMIN)) { | |
464 | ret = -EPERM; | |
465 | break; | |
466 | } | |
467 | goto set_rcvbuf; | |
468 | ||
1da177e4 LT |
469 | case SO_KEEPALIVE: |
470 | #ifdef CONFIG_INET | |
471 | if (sk->sk_protocol == IPPROTO_TCP) | |
472 | tcp_set_keepalive(sk, valbool); | |
473 | #endif | |
474 | sock_valbool_flag(sk, SOCK_KEEPOPEN, valbool); | |
475 | break; | |
476 | ||
4ec93edb | 477 | case SO_OOBINLINE: |
1da177e4 LT |
478 | sock_valbool_flag(sk, SOCK_URGINLINE, valbool); |
479 | break; | |
480 | ||
4ec93edb | 481 | case SO_NO_CHECK: |
1da177e4 LT |
482 | sk->sk_no_check = valbool; |
483 | break; | |
484 | ||
485 | case SO_PRIORITY: | |
4ec93edb | 486 | if ((val >= 0 && val <= 6) || capable(CAP_NET_ADMIN)) |
1da177e4 LT |
487 | sk->sk_priority = val; |
488 | else | |
489 | ret = -EPERM; | |
490 | break; | |
491 | ||
492 | case SO_LINGER: | |
493 | if(optlen<sizeof(ling)) { | |
494 | ret = -EINVAL; /* 1003.1g */ | |
495 | break; | |
496 | } | |
497 | if (copy_from_user(&ling,optval,sizeof(ling))) { | |
498 | ret = -EFAULT; | |
499 | break; | |
500 | } | |
501 | if (!ling.l_onoff) | |
502 | sock_reset_flag(sk, SOCK_LINGER); | |
503 | else { | |
504 | #if (BITS_PER_LONG == 32) | |
9261c9b0 | 505 | if ((unsigned int)ling.l_linger >= MAX_SCHEDULE_TIMEOUT/HZ) |
1da177e4 LT |
506 | sk->sk_lingertime = MAX_SCHEDULE_TIMEOUT; |
507 | else | |
508 | #endif | |
9261c9b0 | 509 | sk->sk_lingertime = (unsigned int)ling.l_linger * HZ; |
1da177e4 LT |
510 | sock_set_flag(sk, SOCK_LINGER); |
511 | } | |
512 | break; | |
513 | ||
514 | case SO_BSDCOMPAT: | |
515 | sock_warn_obsolete_bsdism("setsockopt"); | |
516 | break; | |
517 | ||
518 | case SO_PASSCRED: | |
519 | if (valbool) | |
520 | set_bit(SOCK_PASSCRED, &sock->flags); | |
521 | else | |
522 | clear_bit(SOCK_PASSCRED, &sock->flags); | |
523 | break; | |
524 | ||
525 | case SO_TIMESTAMP: | |
526 | if (valbool) { | |
527 | sock_set_flag(sk, SOCK_RCVTSTAMP); | |
528 | sock_enable_timestamp(sk); | |
529 | } else | |
530 | sock_reset_flag(sk, SOCK_RCVTSTAMP); | |
531 | break; | |
532 | ||
533 | case SO_RCVLOWAT: | |
534 | if (val < 0) | |
535 | val = INT_MAX; | |
536 | sk->sk_rcvlowat = val ? : 1; | |
537 | break; | |
538 | ||
539 | case SO_RCVTIMEO: | |
540 | ret = sock_set_timeout(&sk->sk_rcvtimeo, optval, optlen); | |
541 | break; | |
542 | ||
543 | case SO_SNDTIMEO: | |
544 | ret = sock_set_timeout(&sk->sk_sndtimeo, optval, optlen); | |
545 | break; | |
546 | ||
547 | #ifdef CONFIG_NETDEVICES | |
548 | case SO_BINDTODEVICE: | |
549 | { | |
4ec93edb | 550 | char devname[IFNAMSIZ]; |
1da177e4 | 551 | |
4ec93edb | 552 | /* Sorry... */ |
1da177e4 LT |
553 | if (!capable(CAP_NET_RAW)) { |
554 | ret = -EPERM; | |
555 | break; | |
556 | } | |
557 | ||
558 | /* Bind this socket to a particular device like "eth0", | |
559 | * as specified in the passed interface name. If the | |
4ec93edb YH |
560 | * name is "" or the option length is zero the socket |
561 | * is not bound. | |
562 | */ | |
1da177e4 LT |
563 | |
564 | if (!valbool) { | |
565 | sk->sk_bound_dev_if = 0; | |
566 | } else { | |
f67ed26f DM |
567 | if (optlen > IFNAMSIZ - 1) |
568 | optlen = IFNAMSIZ - 1; | |
569 | memset(devname, 0, sizeof(devname)); | |
1da177e4 LT |
570 | if (copy_from_user(devname, optval, optlen)) { |
571 | ret = -EFAULT; | |
572 | break; | |
573 | } | |
574 | ||
575 | /* Remove any cached route for this socket. */ | |
576 | sk_dst_reset(sk); | |
577 | ||
578 | if (devname[0] == '\0') { | |
579 | sk->sk_bound_dev_if = 0; | |
580 | } else { | |
581 | struct net_device *dev = dev_get_by_name(devname); | |
582 | if (!dev) { | |
583 | ret = -ENODEV; | |
584 | break; | |
585 | } | |
586 | sk->sk_bound_dev_if = dev->ifindex; | |
587 | dev_put(dev); | |
588 | } | |
589 | } | |
590 | break; | |
591 | } | |
592 | #endif | |
593 | ||
594 | ||
595 | case SO_ATTACH_FILTER: | |
596 | ret = -EINVAL; | |
597 | if (optlen == sizeof(struct sock_fprog)) { | |
598 | struct sock_fprog fprog; | |
599 | ||
600 | ret = -EFAULT; | |
601 | if (copy_from_user(&fprog, optval, sizeof(fprog))) | |
602 | break; | |
603 | ||
604 | ret = sk_attach_filter(&fprog, sk); | |
605 | } | |
606 | break; | |
607 | ||
608 | case SO_DETACH_FILTER: | |
fda9ef5d DM |
609 | rcu_read_lock_bh(); |
610 | filter = rcu_dereference(sk->sk_filter); | |
4ec93edb | 611 | if (filter) { |
fda9ef5d | 612 | rcu_assign_pointer(sk->sk_filter, NULL); |
1da177e4 | 613 | sk_filter_release(sk, filter); |
fda9ef5d | 614 | rcu_read_unlock_bh(); |
1da177e4 LT |
615 | break; |
616 | } | |
fda9ef5d | 617 | rcu_read_unlock_bh(); |
1da177e4 LT |
618 | ret = -ENONET; |
619 | break; | |
620 | ||
877ce7c1 CZ |
621 | case SO_PASSSEC: |
622 | if (valbool) | |
623 | set_bit(SOCK_PASSSEC, &sock->flags); | |
624 | else | |
625 | clear_bit(SOCK_PASSSEC, &sock->flags); | |
626 | break; | |
627 | ||
1da177e4 LT |
628 | /* We implement the SO_SNDLOWAT etc to |
629 | not be settable (1003.1g 5.3) */ | |
630 | default: | |
4ec93edb | 631 | ret = -ENOPROTOOPT; |
1da177e4 | 632 | break; |
4ec93edb | 633 | } |
1da177e4 LT |
634 | release_sock(sk); |
635 | return ret; | |
636 | } | |
637 | ||
638 | ||
639 | int sock_getsockopt(struct socket *sock, int level, int optname, | |
640 | char __user *optval, int __user *optlen) | |
641 | { | |
642 | struct sock *sk = sock->sk; | |
4ec93edb | 643 | |
1da177e4 LT |
644 | union |
645 | { | |
4ec93edb YH |
646 | int val; |
647 | struct linger ling; | |
1da177e4 LT |
648 | struct timeval tm; |
649 | } v; | |
4ec93edb | 650 | |
1da177e4 LT |
651 | unsigned int lv = sizeof(int); |
652 | int len; | |
4ec93edb YH |
653 | |
654 | if(get_user(len,optlen)) | |
655 | return -EFAULT; | |
1da177e4 LT |
656 | if(len < 0) |
657 | return -EINVAL; | |
4ec93edb YH |
658 | |
659 | switch(optname) | |
660 | { | |
661 | case SO_DEBUG: | |
1da177e4 LT |
662 | v.val = sock_flag(sk, SOCK_DBG); |
663 | break; | |
4ec93edb | 664 | |
1da177e4 LT |
665 | case SO_DONTROUTE: |
666 | v.val = sock_flag(sk, SOCK_LOCALROUTE); | |
667 | break; | |
4ec93edb | 668 | |
1da177e4 LT |
669 | case SO_BROADCAST: |
670 | v.val = !!sock_flag(sk, SOCK_BROADCAST); | |
671 | break; | |
672 | ||
673 | case SO_SNDBUF: | |
674 | v.val = sk->sk_sndbuf; | |
675 | break; | |
4ec93edb | 676 | |
1da177e4 LT |
677 | case SO_RCVBUF: |
678 | v.val = sk->sk_rcvbuf; | |
679 | break; | |
680 | ||
681 | case SO_REUSEADDR: | |
682 | v.val = sk->sk_reuse; | |
683 | break; | |
684 | ||
685 | case SO_KEEPALIVE: | |
686 | v.val = !!sock_flag(sk, SOCK_KEEPOPEN); | |
687 | break; | |
688 | ||
689 | case SO_TYPE: | |
4ec93edb | 690 | v.val = sk->sk_type; |
1da177e4 LT |
691 | break; |
692 | ||
693 | case SO_ERROR: | |
694 | v.val = -sock_error(sk); | |
695 | if(v.val==0) | |
696 | v.val = xchg(&sk->sk_err_soft, 0); | |
697 | break; | |
698 | ||
699 | case SO_OOBINLINE: | |
700 | v.val = !!sock_flag(sk, SOCK_URGINLINE); | |
701 | break; | |
4ec93edb | 702 | |
1da177e4 LT |
703 | case SO_NO_CHECK: |
704 | v.val = sk->sk_no_check; | |
705 | break; | |
706 | ||
707 | case SO_PRIORITY: | |
708 | v.val = sk->sk_priority; | |
709 | break; | |
4ec93edb YH |
710 | |
711 | case SO_LINGER: | |
1da177e4 LT |
712 | lv = sizeof(v.ling); |
713 | v.ling.l_onoff = !!sock_flag(sk, SOCK_LINGER); | |
4ec93edb | 714 | v.ling.l_linger = sk->sk_lingertime / HZ; |
1da177e4 | 715 | break; |
4ec93edb | 716 | |
1da177e4 LT |
717 | case SO_BSDCOMPAT: |
718 | sock_warn_obsolete_bsdism("getsockopt"); | |
719 | break; | |
720 | ||
721 | case SO_TIMESTAMP: | |
722 | v.val = sock_flag(sk, SOCK_RCVTSTAMP); | |
723 | break; | |
724 | ||
725 | case SO_RCVTIMEO: | |
726 | lv=sizeof(struct timeval); | |
727 | if (sk->sk_rcvtimeo == MAX_SCHEDULE_TIMEOUT) { | |
728 | v.tm.tv_sec = 0; | |
729 | v.tm.tv_usec = 0; | |
730 | } else { | |
731 | v.tm.tv_sec = sk->sk_rcvtimeo / HZ; | |
732 | v.tm.tv_usec = ((sk->sk_rcvtimeo % HZ) * 1000000) / HZ; | |
733 | } | |
734 | break; | |
735 | ||
736 | case SO_SNDTIMEO: | |
737 | lv=sizeof(struct timeval); | |
738 | if (sk->sk_sndtimeo == MAX_SCHEDULE_TIMEOUT) { | |
739 | v.tm.tv_sec = 0; | |
740 | v.tm.tv_usec = 0; | |
741 | } else { | |
742 | v.tm.tv_sec = sk->sk_sndtimeo / HZ; | |
743 | v.tm.tv_usec = ((sk->sk_sndtimeo % HZ) * 1000000) / HZ; | |
744 | } | |
745 | break; | |
746 | ||
747 | case SO_RCVLOWAT: | |
748 | v.val = sk->sk_rcvlowat; | |
749 | break; | |
750 | ||
751 | case SO_SNDLOWAT: | |
752 | v.val=1; | |
4ec93edb | 753 | break; |
1da177e4 LT |
754 | |
755 | case SO_PASSCRED: | |
756 | v.val = test_bit(SOCK_PASSCRED, &sock->flags) ? 1 : 0; | |
757 | break; | |
758 | ||
759 | case SO_PEERCRED: | |
760 | if (len > sizeof(sk->sk_peercred)) | |
761 | len = sizeof(sk->sk_peercred); | |
762 | if (copy_to_user(optval, &sk->sk_peercred, len)) | |
763 | return -EFAULT; | |
764 | goto lenout; | |
765 | ||
766 | case SO_PEERNAME: | |
767 | { | |
768 | char address[128]; | |
769 | ||
770 | if (sock->ops->getname(sock, (struct sockaddr *)address, &lv, 2)) | |
771 | return -ENOTCONN; | |
772 | if (lv < len) | |
773 | return -EINVAL; | |
774 | if (copy_to_user(optval, address, len)) | |
775 | return -EFAULT; | |
776 | goto lenout; | |
777 | } | |
778 | ||
779 | /* Dubious BSD thing... Probably nobody even uses it, but | |
780 | * the UNIX standard wants it for whatever reason... -DaveM | |
781 | */ | |
782 | case SO_ACCEPTCONN: | |
783 | v.val = sk->sk_state == TCP_LISTEN; | |
784 | break; | |
785 | ||
877ce7c1 CZ |
786 | case SO_PASSSEC: |
787 | v.val = test_bit(SOCK_PASSSEC, &sock->flags) ? 1 : 0; | |
788 | break; | |
789 | ||
1da177e4 | 790 | case SO_PEERSEC: |
2c7946a7 | 791 | return security_socket_getpeersec_stream(sock, optval, optlen, len); |
1da177e4 LT |
792 | |
793 | default: | |
794 | return(-ENOPROTOOPT); | |
795 | } | |
796 | if (len > lv) | |
797 | len = lv; | |
798 | if (copy_to_user(optval, &v, len)) | |
799 | return -EFAULT; | |
800 | lenout: | |
4ec93edb YH |
801 | if (put_user(len, optlen)) |
802 | return -EFAULT; | |
803 | return 0; | |
1da177e4 LT |
804 | } |
805 | ||
a5b5bb9a IM |
806 | /* |
807 | * Initialize an sk_lock. | |
808 | * | |
809 | * (We also register the sk_lock with the lock validator.) | |
810 | */ | |
b6f99a21 | 811 | static inline void sock_lock_init(struct sock *sk) |
a5b5bb9a | 812 | { |
ed07536e PZ |
813 | sock_lock_init_class_and_name(sk, |
814 | af_family_slock_key_strings[sk->sk_family], | |
815 | af_family_slock_keys + sk->sk_family, | |
816 | af_family_key_strings[sk->sk_family], | |
817 | af_family_keys + sk->sk_family); | |
a5b5bb9a IM |
818 | } |
819 | ||
1da177e4 LT |
820 | /** |
821 | * sk_alloc - All socket objects are allocated here | |
4dc3b16b PP |
822 | * @family: protocol family |
823 | * @priority: for allocation (%GFP_KERNEL, %GFP_ATOMIC, etc) | |
824 | * @prot: struct proto associated with this new sock instance | |
825 | * @zero_it: if we should zero the newly allocated sock | |
1da177e4 | 826 | */ |
dd0fc66f | 827 | struct sock *sk_alloc(int family, gfp_t priority, |
86a76caf | 828 | struct proto *prot, int zero_it) |
1da177e4 LT |
829 | { |
830 | struct sock *sk = NULL; | |
e18b890b | 831 | struct kmem_cache *slab = prot->slab; |
1da177e4 LT |
832 | |
833 | if (slab != NULL) | |
834 | sk = kmem_cache_alloc(slab, priority); | |
835 | else | |
836 | sk = kmalloc(prot->obj_size, priority); | |
837 | ||
838 | if (sk) { | |
839 | if (zero_it) { | |
840 | memset(sk, 0, prot->obj_size); | |
841 | sk->sk_family = family; | |
476e19cf ACM |
842 | /* |
843 | * See comment in struct sock definition to understand | |
844 | * why we need sk_prot_creator -acme | |
845 | */ | |
846 | sk->sk_prot = sk->sk_prot_creator = prot; | |
1da177e4 LT |
847 | sock_lock_init(sk); |
848 | } | |
4ec93edb | 849 | |
a79af59e FF |
850 | if (security_sk_alloc(sk, family, priority)) |
851 | goto out_free; | |
852 | ||
853 | if (!try_module_get(prot->owner)) | |
854 | goto out_free; | |
1da177e4 LT |
855 | } |
856 | return sk; | |
a79af59e FF |
857 | |
858 | out_free: | |
859 | if (slab != NULL) | |
860 | kmem_cache_free(slab, sk); | |
861 | else | |
862 | kfree(sk); | |
863 | return NULL; | |
1da177e4 LT |
864 | } |
865 | ||
866 | void sk_free(struct sock *sk) | |
867 | { | |
868 | struct sk_filter *filter; | |
476e19cf | 869 | struct module *owner = sk->sk_prot_creator->owner; |
1da177e4 LT |
870 | |
871 | if (sk->sk_destruct) | |
872 | sk->sk_destruct(sk); | |
873 | ||
fda9ef5d | 874 | filter = rcu_dereference(sk->sk_filter); |
1da177e4 LT |
875 | if (filter) { |
876 | sk_filter_release(sk, filter); | |
fda9ef5d | 877 | rcu_assign_pointer(sk->sk_filter, NULL); |
1da177e4 LT |
878 | } |
879 | ||
880 | sock_disable_timestamp(sk); | |
881 | ||
882 | if (atomic_read(&sk->sk_omem_alloc)) | |
883 | printk(KERN_DEBUG "%s: optmem leakage (%d bytes) detected.\n", | |
884 | __FUNCTION__, atomic_read(&sk->sk_omem_alloc)); | |
885 | ||
886 | security_sk_free(sk); | |
476e19cf ACM |
887 | if (sk->sk_prot_creator->slab != NULL) |
888 | kmem_cache_free(sk->sk_prot_creator->slab, sk); | |
1da177e4 LT |
889 | else |
890 | kfree(sk); | |
891 | module_put(owner); | |
892 | } | |
893 | ||
dd0fc66f | 894 | struct sock *sk_clone(const struct sock *sk, const gfp_t priority) |
87d11ceb ACM |
895 | { |
896 | struct sock *newsk = sk_alloc(sk->sk_family, priority, sk->sk_prot, 0); | |
897 | ||
898 | if (newsk != NULL) { | |
899 | struct sk_filter *filter; | |
900 | ||
892c141e | 901 | sock_copy(newsk, sk); |
87d11ceb ACM |
902 | |
903 | /* SANITY */ | |
904 | sk_node_init(&newsk->sk_node); | |
905 | sock_lock_init(newsk); | |
906 | bh_lock_sock(newsk); | |
fa438ccf | 907 | newsk->sk_backlog.head = newsk->sk_backlog.tail = NULL; |
87d11ceb ACM |
908 | |
909 | atomic_set(&newsk->sk_rmem_alloc, 0); | |
910 | atomic_set(&newsk->sk_wmem_alloc, 0); | |
911 | atomic_set(&newsk->sk_omem_alloc, 0); | |
912 | skb_queue_head_init(&newsk->sk_receive_queue); | |
913 | skb_queue_head_init(&newsk->sk_write_queue); | |
97fc2f08 CL |
914 | #ifdef CONFIG_NET_DMA |
915 | skb_queue_head_init(&newsk->sk_async_wait_queue); | |
916 | #endif | |
87d11ceb ACM |
917 | |
918 | rwlock_init(&newsk->sk_dst_lock); | |
919 | rwlock_init(&newsk->sk_callback_lock); | |
da21f24d IM |
920 | lockdep_set_class(&newsk->sk_callback_lock, |
921 | af_callback_keys + newsk->sk_family); | |
87d11ceb ACM |
922 | |
923 | newsk->sk_dst_cache = NULL; | |
924 | newsk->sk_wmem_queued = 0; | |
925 | newsk->sk_forward_alloc = 0; | |
926 | newsk->sk_send_head = NULL; | |
87d11ceb ACM |
927 | newsk->sk_userlocks = sk->sk_userlocks & ~SOCK_BINDPORT_LOCK; |
928 | ||
929 | sock_reset_flag(newsk, SOCK_DONE); | |
930 | skb_queue_head_init(&newsk->sk_error_queue); | |
931 | ||
932 | filter = newsk->sk_filter; | |
933 | if (filter != NULL) | |
934 | sk_filter_charge(newsk, filter); | |
935 | ||
936 | if (unlikely(xfrm_sk_clone_policy(newsk))) { | |
937 | /* It is still raw copy of parent, so invalidate | |
938 | * destructor and make plain sk_free() */ | |
939 | newsk->sk_destruct = NULL; | |
940 | sk_free(newsk); | |
941 | newsk = NULL; | |
942 | goto out; | |
943 | } | |
944 | ||
945 | newsk->sk_err = 0; | |
946 | newsk->sk_priority = 0; | |
947 | atomic_set(&newsk->sk_refcnt, 2); | |
948 | ||
949 | /* | |
950 | * Increment the counter in the same struct proto as the master | |
951 | * sock (sk_refcnt_debug_inc uses newsk->sk_prot->socks, that | |
952 | * is the same as sk->sk_prot->socks, as this field was copied | |
953 | * with memcpy). | |
954 | * | |
955 | * This _changes_ the previous behaviour, where | |
956 | * tcp_create_openreq_child always was incrementing the | |
957 | * equivalent to tcp_prot->socks (inet_sock_nr), so this have | |
958 | * to be taken into account in all callers. -acme | |
959 | */ | |
960 | sk_refcnt_debug_inc(newsk); | |
961 | newsk->sk_socket = NULL; | |
962 | newsk->sk_sleep = NULL; | |
963 | ||
964 | if (newsk->sk_prot->sockets_allocated) | |
965 | atomic_inc(newsk->sk_prot->sockets_allocated); | |
966 | } | |
967 | out: | |
968 | return newsk; | |
969 | } | |
970 | ||
971 | EXPORT_SYMBOL_GPL(sk_clone); | |
972 | ||
1da177e4 LT |
973 | void __init sk_init(void) |
974 | { | |
975 | if (num_physpages <= 4096) { | |
976 | sysctl_wmem_max = 32767; | |
977 | sysctl_rmem_max = 32767; | |
978 | sysctl_wmem_default = 32767; | |
979 | sysctl_rmem_default = 32767; | |
980 | } else if (num_physpages >= 131072) { | |
981 | sysctl_wmem_max = 131071; | |
982 | sysctl_rmem_max = 131071; | |
983 | } | |
984 | } | |
985 | ||
986 | /* | |
987 | * Simple resource managers for sockets. | |
988 | */ | |
989 | ||
990 | ||
4ec93edb YH |
991 | /* |
992 | * Write buffer destructor automatically called from kfree_skb. | |
1da177e4 LT |
993 | */ |
994 | void sock_wfree(struct sk_buff *skb) | |
995 | { | |
996 | struct sock *sk = skb->sk; | |
997 | ||
998 | /* In case it might be waiting for more memory. */ | |
999 | atomic_sub(skb->truesize, &sk->sk_wmem_alloc); | |
1000 | if (!sock_flag(sk, SOCK_USE_WRITE_QUEUE)) | |
1001 | sk->sk_write_space(sk); | |
1002 | sock_put(sk); | |
1003 | } | |
1004 | ||
4ec93edb YH |
1005 | /* |
1006 | * Read buffer destructor automatically called from kfree_skb. | |
1da177e4 LT |
1007 | */ |
1008 | void sock_rfree(struct sk_buff *skb) | |
1009 | { | |
1010 | struct sock *sk = skb->sk; | |
1011 | ||
1012 | atomic_sub(skb->truesize, &sk->sk_rmem_alloc); | |
1013 | } | |
1014 | ||
1015 | ||
1016 | int sock_i_uid(struct sock *sk) | |
1017 | { | |
1018 | int uid; | |
1019 | ||
1020 | read_lock(&sk->sk_callback_lock); | |
1021 | uid = sk->sk_socket ? SOCK_INODE(sk->sk_socket)->i_uid : 0; | |
1022 | read_unlock(&sk->sk_callback_lock); | |
1023 | return uid; | |
1024 | } | |
1025 | ||
1026 | unsigned long sock_i_ino(struct sock *sk) | |
1027 | { | |
1028 | unsigned long ino; | |
1029 | ||
1030 | read_lock(&sk->sk_callback_lock); | |
1031 | ino = sk->sk_socket ? SOCK_INODE(sk->sk_socket)->i_ino : 0; | |
1032 | read_unlock(&sk->sk_callback_lock); | |
1033 | return ino; | |
1034 | } | |
1035 | ||
1036 | /* | |
1037 | * Allocate a skb from the socket's send buffer. | |
1038 | */ | |
86a76caf | 1039 | struct sk_buff *sock_wmalloc(struct sock *sk, unsigned long size, int force, |
dd0fc66f | 1040 | gfp_t priority) |
1da177e4 LT |
1041 | { |
1042 | if (force || atomic_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf) { | |
1043 | struct sk_buff * skb = alloc_skb(size, priority); | |
1044 | if (skb) { | |
1045 | skb_set_owner_w(skb, sk); | |
1046 | return skb; | |
1047 | } | |
1048 | } | |
1049 | return NULL; | |
1050 | } | |
1051 | ||
1052 | /* | |
1053 | * Allocate a skb from the socket's receive buffer. | |
4ec93edb | 1054 | */ |
86a76caf | 1055 | struct sk_buff *sock_rmalloc(struct sock *sk, unsigned long size, int force, |
dd0fc66f | 1056 | gfp_t priority) |
1da177e4 LT |
1057 | { |
1058 | if (force || atomic_read(&sk->sk_rmem_alloc) < sk->sk_rcvbuf) { | |
1059 | struct sk_buff *skb = alloc_skb(size, priority); | |
1060 | if (skb) { | |
1061 | skb_set_owner_r(skb, sk); | |
1062 | return skb; | |
1063 | } | |
1064 | } | |
1065 | return NULL; | |
1066 | } | |
1067 | ||
4ec93edb | 1068 | /* |
1da177e4 | 1069 | * Allocate a memory block from the socket's option memory buffer. |
4ec93edb | 1070 | */ |
dd0fc66f | 1071 | void *sock_kmalloc(struct sock *sk, int size, gfp_t priority) |
1da177e4 LT |
1072 | { |
1073 | if ((unsigned)size <= sysctl_optmem_max && | |
1074 | atomic_read(&sk->sk_omem_alloc) + size < sysctl_optmem_max) { | |
1075 | void *mem; | |
1076 | /* First do the add, to avoid the race if kmalloc | |
4ec93edb | 1077 | * might sleep. |
1da177e4 LT |
1078 | */ |
1079 | atomic_add(size, &sk->sk_omem_alloc); | |
1080 | mem = kmalloc(size, priority); | |
1081 | if (mem) | |
1082 | return mem; | |
1083 | atomic_sub(size, &sk->sk_omem_alloc); | |
1084 | } | |
1085 | return NULL; | |
1086 | } | |
1087 | ||
1088 | /* | |
1089 | * Free an option memory block. | |
1090 | */ | |
1091 | void sock_kfree_s(struct sock *sk, void *mem, int size) | |
1092 | { | |
1093 | kfree(mem); | |
1094 | atomic_sub(size, &sk->sk_omem_alloc); | |
1095 | } | |
1096 | ||
1097 | /* It is almost wait_for_tcp_memory minus release_sock/lock_sock. | |
1098 | I think, these locks should be removed for datagram sockets. | |
1099 | */ | |
1100 | static long sock_wait_for_wmem(struct sock * sk, long timeo) | |
1101 | { | |
1102 | DEFINE_WAIT(wait); | |
1103 | ||
1104 | clear_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags); | |
1105 | for (;;) { | |
1106 | if (!timeo) | |
1107 | break; | |
1108 | if (signal_pending(current)) | |
1109 | break; | |
1110 | set_bit(SOCK_NOSPACE, &sk->sk_socket->flags); | |
1111 | prepare_to_wait(sk->sk_sleep, &wait, TASK_INTERRUPTIBLE); | |
1112 | if (atomic_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf) | |
1113 | break; | |
1114 | if (sk->sk_shutdown & SEND_SHUTDOWN) | |
1115 | break; | |
1116 | if (sk->sk_err) | |
1117 | break; | |
1118 | timeo = schedule_timeout(timeo); | |
1119 | } | |
1120 | finish_wait(sk->sk_sleep, &wait); | |
1121 | return timeo; | |
1122 | } | |
1123 | ||
1124 | ||
1125 | /* | |
1126 | * Generic send/receive buffer handlers | |
1127 | */ | |
1128 | ||
1129 | static struct sk_buff *sock_alloc_send_pskb(struct sock *sk, | |
1130 | unsigned long header_len, | |
1131 | unsigned long data_len, | |
1132 | int noblock, int *errcode) | |
1133 | { | |
1134 | struct sk_buff *skb; | |
7d877f3b | 1135 | gfp_t gfp_mask; |
1da177e4 LT |
1136 | long timeo; |
1137 | int err; | |
1138 | ||
1139 | gfp_mask = sk->sk_allocation; | |
1140 | if (gfp_mask & __GFP_WAIT) | |
1141 | gfp_mask |= __GFP_REPEAT; | |
1142 | ||
1143 | timeo = sock_sndtimeo(sk, noblock); | |
1144 | while (1) { | |
1145 | err = sock_error(sk); | |
1146 | if (err != 0) | |
1147 | goto failure; | |
1148 | ||
1149 | err = -EPIPE; | |
1150 | if (sk->sk_shutdown & SEND_SHUTDOWN) | |
1151 | goto failure; | |
1152 | ||
1153 | if (atomic_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf) { | |
db38c179 | 1154 | skb = alloc_skb(header_len, gfp_mask); |
1da177e4 LT |
1155 | if (skb) { |
1156 | int npages; | |
1157 | int i; | |
1158 | ||
1159 | /* No pages, we're done... */ | |
1160 | if (!data_len) | |
1161 | break; | |
1162 | ||
1163 | npages = (data_len + (PAGE_SIZE - 1)) >> PAGE_SHIFT; | |
1164 | skb->truesize += data_len; | |
1165 | skb_shinfo(skb)->nr_frags = npages; | |
1166 | for (i = 0; i < npages; i++) { | |
1167 | struct page *page; | |
1168 | skb_frag_t *frag; | |
1169 | ||
1170 | page = alloc_pages(sk->sk_allocation, 0); | |
1171 | if (!page) { | |
1172 | err = -ENOBUFS; | |
1173 | skb_shinfo(skb)->nr_frags = i; | |
1174 | kfree_skb(skb); | |
1175 | goto failure; | |
1176 | } | |
1177 | ||
1178 | frag = &skb_shinfo(skb)->frags[i]; | |
1179 | frag->page = page; | |
1180 | frag->page_offset = 0; | |
1181 | frag->size = (data_len >= PAGE_SIZE ? | |
1182 | PAGE_SIZE : | |
1183 | data_len); | |
1184 | data_len -= PAGE_SIZE; | |
1185 | } | |
1186 | ||
1187 | /* Full success... */ | |
1188 | break; | |
1189 | } | |
1190 | err = -ENOBUFS; | |
1191 | goto failure; | |
1192 | } | |
1193 | set_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags); | |
1194 | set_bit(SOCK_NOSPACE, &sk->sk_socket->flags); | |
1195 | err = -EAGAIN; | |
1196 | if (!timeo) | |
1197 | goto failure; | |
1198 | if (signal_pending(current)) | |
1199 | goto interrupted; | |
1200 | timeo = sock_wait_for_wmem(sk, timeo); | |
1201 | } | |
1202 | ||
1203 | skb_set_owner_w(skb, sk); | |
1204 | return skb; | |
1205 | ||
1206 | interrupted: | |
1207 | err = sock_intr_errno(timeo); | |
1208 | failure: | |
1209 | *errcode = err; | |
1210 | return NULL; | |
1211 | } | |
1212 | ||
4ec93edb | 1213 | struct sk_buff *sock_alloc_send_skb(struct sock *sk, unsigned long size, |
1da177e4 LT |
1214 | int noblock, int *errcode) |
1215 | { | |
1216 | return sock_alloc_send_pskb(sk, size, 0, noblock, errcode); | |
1217 | } | |
1218 | ||
1219 | static void __lock_sock(struct sock *sk) | |
1220 | { | |
1221 | DEFINE_WAIT(wait); | |
1222 | ||
1223 | for(;;) { | |
1224 | prepare_to_wait_exclusive(&sk->sk_lock.wq, &wait, | |
1225 | TASK_UNINTERRUPTIBLE); | |
1226 | spin_unlock_bh(&sk->sk_lock.slock); | |
1227 | schedule(); | |
1228 | spin_lock_bh(&sk->sk_lock.slock); | |
1229 | if(!sock_owned_by_user(sk)) | |
1230 | break; | |
1231 | } | |
1232 | finish_wait(&sk->sk_lock.wq, &wait); | |
1233 | } | |
1234 | ||
1235 | static void __release_sock(struct sock *sk) | |
1236 | { | |
1237 | struct sk_buff *skb = sk->sk_backlog.head; | |
1238 | ||
1239 | do { | |
1240 | sk->sk_backlog.head = sk->sk_backlog.tail = NULL; | |
1241 | bh_unlock_sock(sk); | |
1242 | ||
1243 | do { | |
1244 | struct sk_buff *next = skb->next; | |
1245 | ||
1246 | skb->next = NULL; | |
1247 | sk->sk_backlog_rcv(sk, skb); | |
1248 | ||
1249 | /* | |
1250 | * We are in process context here with softirqs | |
1251 | * disabled, use cond_resched_softirq() to preempt. | |
1252 | * This is safe to do because we've taken the backlog | |
1253 | * queue private: | |
1254 | */ | |
1255 | cond_resched_softirq(); | |
1256 | ||
1257 | skb = next; | |
1258 | } while (skb != NULL); | |
1259 | ||
1260 | bh_lock_sock(sk); | |
1261 | } while((skb = sk->sk_backlog.head) != NULL); | |
1262 | } | |
1263 | ||
1264 | /** | |
1265 | * sk_wait_data - wait for data to arrive at sk_receive_queue | |
4dc3b16b PP |
1266 | * @sk: sock to wait on |
1267 | * @timeo: for how long | |
1da177e4 LT |
1268 | * |
1269 | * Now socket state including sk->sk_err is changed only under lock, | |
1270 | * hence we may omit checks after joining wait queue. | |
1271 | * We check receive queue before schedule() only as optimization; | |
1272 | * it is very likely that release_sock() added new data. | |
1273 | */ | |
1274 | int sk_wait_data(struct sock *sk, long *timeo) | |
1275 | { | |
1276 | int rc; | |
1277 | DEFINE_WAIT(wait); | |
1278 | ||
1279 | prepare_to_wait(sk->sk_sleep, &wait, TASK_INTERRUPTIBLE); | |
1280 | set_bit(SOCK_ASYNC_WAITDATA, &sk->sk_socket->flags); | |
1281 | rc = sk_wait_event(sk, timeo, !skb_queue_empty(&sk->sk_receive_queue)); | |
1282 | clear_bit(SOCK_ASYNC_WAITDATA, &sk->sk_socket->flags); | |
1283 | finish_wait(sk->sk_sleep, &wait); | |
1284 | return rc; | |
1285 | } | |
1286 | ||
1287 | EXPORT_SYMBOL(sk_wait_data); | |
1288 | ||
1289 | /* | |
1290 | * Set of default routines for initialising struct proto_ops when | |
1291 | * the protocol does not support a particular function. In certain | |
1292 | * cases where it makes no sense for a protocol to have a "do nothing" | |
1293 | * function, some default processing is provided. | |
1294 | */ | |
1295 | ||
1296 | int sock_no_bind(struct socket *sock, struct sockaddr *saddr, int len) | |
1297 | { | |
1298 | return -EOPNOTSUPP; | |
1299 | } | |
1300 | ||
4ec93edb | 1301 | int sock_no_connect(struct socket *sock, struct sockaddr *saddr, |
1da177e4 LT |
1302 | int len, int flags) |
1303 | { | |
1304 | return -EOPNOTSUPP; | |
1305 | } | |
1306 | ||
1307 | int sock_no_socketpair(struct socket *sock1, struct socket *sock2) | |
1308 | { | |
1309 | return -EOPNOTSUPP; | |
1310 | } | |
1311 | ||
1312 | int sock_no_accept(struct socket *sock, struct socket *newsock, int flags) | |
1313 | { | |
1314 | return -EOPNOTSUPP; | |
1315 | } | |
1316 | ||
4ec93edb | 1317 | int sock_no_getname(struct socket *sock, struct sockaddr *saddr, |
1da177e4 LT |
1318 | int *len, int peer) |
1319 | { | |
1320 | return -EOPNOTSUPP; | |
1321 | } | |
1322 | ||
1323 | unsigned int sock_no_poll(struct file * file, struct socket *sock, poll_table *pt) | |
1324 | { | |
1325 | return 0; | |
1326 | } | |
1327 | ||
1328 | int sock_no_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg) | |
1329 | { | |
1330 | return -EOPNOTSUPP; | |
1331 | } | |
1332 | ||
1333 | int sock_no_listen(struct socket *sock, int backlog) | |
1334 | { | |
1335 | return -EOPNOTSUPP; | |
1336 | } | |
1337 | ||
1338 | int sock_no_shutdown(struct socket *sock, int how) | |
1339 | { | |
1340 | return -EOPNOTSUPP; | |
1341 | } | |
1342 | ||
1343 | int sock_no_setsockopt(struct socket *sock, int level, int optname, | |
1344 | char __user *optval, int optlen) | |
1345 | { | |
1346 | return -EOPNOTSUPP; | |
1347 | } | |
1348 | ||
1349 | int sock_no_getsockopt(struct socket *sock, int level, int optname, | |
1350 | char __user *optval, int __user *optlen) | |
1351 | { | |
1352 | return -EOPNOTSUPP; | |
1353 | } | |
1354 | ||
1355 | int sock_no_sendmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *m, | |
1356 | size_t len) | |
1357 | { | |
1358 | return -EOPNOTSUPP; | |
1359 | } | |
1360 | ||
1361 | int sock_no_recvmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *m, | |
1362 | size_t len, int flags) | |
1363 | { | |
1364 | return -EOPNOTSUPP; | |
1365 | } | |
1366 | ||
1367 | int sock_no_mmap(struct file *file, struct socket *sock, struct vm_area_struct *vma) | |
1368 | { | |
1369 | /* Mirror missing mmap method error code */ | |
1370 | return -ENODEV; | |
1371 | } | |
1372 | ||
1373 | ssize_t sock_no_sendpage(struct socket *sock, struct page *page, int offset, size_t size, int flags) | |
1374 | { | |
1375 | ssize_t res; | |
1376 | struct msghdr msg = {.msg_flags = flags}; | |
1377 | struct kvec iov; | |
1378 | char *kaddr = kmap(page); | |
1379 | iov.iov_base = kaddr + offset; | |
1380 | iov.iov_len = size; | |
1381 | res = kernel_sendmsg(sock, &msg, &iov, 1, size); | |
1382 | kunmap(page); | |
1383 | return res; | |
1384 | } | |
1385 | ||
1386 | /* | |
1387 | * Default Socket Callbacks | |
1388 | */ | |
1389 | ||
1390 | static void sock_def_wakeup(struct sock *sk) | |
1391 | { | |
1392 | read_lock(&sk->sk_callback_lock); | |
1393 | if (sk->sk_sleep && waitqueue_active(sk->sk_sleep)) | |
1394 | wake_up_interruptible_all(sk->sk_sleep); | |
1395 | read_unlock(&sk->sk_callback_lock); | |
1396 | } | |
1397 | ||
1398 | static void sock_def_error_report(struct sock *sk) | |
1399 | { | |
1400 | read_lock(&sk->sk_callback_lock); | |
1401 | if (sk->sk_sleep && waitqueue_active(sk->sk_sleep)) | |
1402 | wake_up_interruptible(sk->sk_sleep); | |
4ec93edb | 1403 | sk_wake_async(sk,0,POLL_ERR); |
1da177e4 LT |
1404 | read_unlock(&sk->sk_callback_lock); |
1405 | } | |
1406 | ||
1407 | static void sock_def_readable(struct sock *sk, int len) | |
1408 | { | |
1409 | read_lock(&sk->sk_callback_lock); | |
1410 | if (sk->sk_sleep && waitqueue_active(sk->sk_sleep)) | |
1411 | wake_up_interruptible(sk->sk_sleep); | |
1412 | sk_wake_async(sk,1,POLL_IN); | |
1413 | read_unlock(&sk->sk_callback_lock); | |
1414 | } | |
1415 | ||
1416 | static void sock_def_write_space(struct sock *sk) | |
1417 | { | |
1418 | read_lock(&sk->sk_callback_lock); | |
1419 | ||
1420 | /* Do not wake up a writer until he can make "significant" | |
1421 | * progress. --DaveM | |
1422 | */ | |
1423 | if((atomic_read(&sk->sk_wmem_alloc) << 1) <= sk->sk_sndbuf) { | |
1424 | if (sk->sk_sleep && waitqueue_active(sk->sk_sleep)) | |
1425 | wake_up_interruptible(sk->sk_sleep); | |
1426 | ||
1427 | /* Should agree with poll, otherwise some programs break */ | |
1428 | if (sock_writeable(sk)) | |
1429 | sk_wake_async(sk, 2, POLL_OUT); | |
1430 | } | |
1431 | ||
1432 | read_unlock(&sk->sk_callback_lock); | |
1433 | } | |
1434 | ||
1435 | static void sock_def_destruct(struct sock *sk) | |
1436 | { | |
a51482bd | 1437 | kfree(sk->sk_protinfo); |
1da177e4 LT |
1438 | } |
1439 | ||
1440 | void sk_send_sigurg(struct sock *sk) | |
1441 | { | |
1442 | if (sk->sk_socket && sk->sk_socket->file) | |
1443 | if (send_sigurg(&sk->sk_socket->file->f_owner)) | |
1444 | sk_wake_async(sk, 3, POLL_PRI); | |
1445 | } | |
1446 | ||
1447 | void sk_reset_timer(struct sock *sk, struct timer_list* timer, | |
1448 | unsigned long expires) | |
1449 | { | |
1450 | if (!mod_timer(timer, expires)) | |
1451 | sock_hold(sk); | |
1452 | } | |
1453 | ||
1454 | EXPORT_SYMBOL(sk_reset_timer); | |
1455 | ||
1456 | void sk_stop_timer(struct sock *sk, struct timer_list* timer) | |
1457 | { | |
1458 | if (timer_pending(timer) && del_timer(timer)) | |
1459 | __sock_put(sk); | |
1460 | } | |
1461 | ||
1462 | EXPORT_SYMBOL(sk_stop_timer); | |
1463 | ||
1464 | void sock_init_data(struct socket *sock, struct sock *sk) | |
1465 | { | |
1466 | skb_queue_head_init(&sk->sk_receive_queue); | |
1467 | skb_queue_head_init(&sk->sk_write_queue); | |
1468 | skb_queue_head_init(&sk->sk_error_queue); | |
97fc2f08 CL |
1469 | #ifdef CONFIG_NET_DMA |
1470 | skb_queue_head_init(&sk->sk_async_wait_queue); | |
1471 | #endif | |
1da177e4 LT |
1472 | |
1473 | sk->sk_send_head = NULL; | |
1474 | ||
1475 | init_timer(&sk->sk_timer); | |
4ec93edb | 1476 | |
1da177e4 LT |
1477 | sk->sk_allocation = GFP_KERNEL; |
1478 | sk->sk_rcvbuf = sysctl_rmem_default; | |
1479 | sk->sk_sndbuf = sysctl_wmem_default; | |
1480 | sk->sk_state = TCP_CLOSE; | |
1481 | sk->sk_socket = sock; | |
1482 | ||
1483 | sock_set_flag(sk, SOCK_ZAPPED); | |
1484 | ||
1485 | if(sock) | |
1486 | { | |
1487 | sk->sk_type = sock->type; | |
1488 | sk->sk_sleep = &sock->wait; | |
1489 | sock->sk = sk; | |
1490 | } else | |
1491 | sk->sk_sleep = NULL; | |
1492 | ||
1493 | rwlock_init(&sk->sk_dst_lock); | |
1494 | rwlock_init(&sk->sk_callback_lock); | |
da21f24d IM |
1495 | lockdep_set_class(&sk->sk_callback_lock, |
1496 | af_callback_keys + sk->sk_family); | |
1da177e4 LT |
1497 | |
1498 | sk->sk_state_change = sock_def_wakeup; | |
1499 | sk->sk_data_ready = sock_def_readable; | |
1500 | sk->sk_write_space = sock_def_write_space; | |
1501 | sk->sk_error_report = sock_def_error_report; | |
1502 | sk->sk_destruct = sock_def_destruct; | |
1503 | ||
1504 | sk->sk_sndmsg_page = NULL; | |
1505 | sk->sk_sndmsg_off = 0; | |
1506 | ||
1507 | sk->sk_peercred.pid = 0; | |
1508 | sk->sk_peercred.uid = -1; | |
1509 | sk->sk_peercred.gid = -1; | |
1510 | sk->sk_write_pending = 0; | |
1511 | sk->sk_rcvlowat = 1; | |
1512 | sk->sk_rcvtimeo = MAX_SCHEDULE_TIMEOUT; | |
1513 | sk->sk_sndtimeo = MAX_SCHEDULE_TIMEOUT; | |
1514 | ||
b7aa0bf7 | 1515 | sk->sk_stamp = ktime_set(-1L, -1L); |
1da177e4 LT |
1516 | |
1517 | atomic_set(&sk->sk_refcnt, 1); | |
1518 | } | |
1519 | ||
fcc70d5f | 1520 | void fastcall lock_sock_nested(struct sock *sk, int subclass) |
1da177e4 LT |
1521 | { |
1522 | might_sleep(); | |
a5b5bb9a | 1523 | spin_lock_bh(&sk->sk_lock.slock); |
1da177e4 LT |
1524 | if (sk->sk_lock.owner) |
1525 | __lock_sock(sk); | |
1526 | sk->sk_lock.owner = (void *)1; | |
a5b5bb9a IM |
1527 | spin_unlock(&sk->sk_lock.slock); |
1528 | /* | |
1529 | * The sk_lock has mutex_lock() semantics here: | |
1530 | */ | |
fcc70d5f | 1531 | mutex_acquire(&sk->sk_lock.dep_map, subclass, 0, _RET_IP_); |
a5b5bb9a | 1532 | local_bh_enable(); |
1da177e4 LT |
1533 | } |
1534 | ||
fcc70d5f | 1535 | EXPORT_SYMBOL(lock_sock_nested); |
1da177e4 LT |
1536 | |
1537 | void fastcall release_sock(struct sock *sk) | |
1538 | { | |
a5b5bb9a IM |
1539 | /* |
1540 | * The sk_lock has mutex_unlock() semantics: | |
1541 | */ | |
1542 | mutex_release(&sk->sk_lock.dep_map, 1, _RET_IP_); | |
1543 | ||
1544 | spin_lock_bh(&sk->sk_lock.slock); | |
1da177e4 LT |
1545 | if (sk->sk_backlog.tail) |
1546 | __release_sock(sk); | |
1547 | sk->sk_lock.owner = NULL; | |
a5b5bb9a IM |
1548 | if (waitqueue_active(&sk->sk_lock.wq)) |
1549 | wake_up(&sk->sk_lock.wq); | |
1550 | spin_unlock_bh(&sk->sk_lock.slock); | |
1da177e4 LT |
1551 | } |
1552 | EXPORT_SYMBOL(release_sock); | |
1553 | ||
1554 | int sock_get_timestamp(struct sock *sk, struct timeval __user *userstamp) | |
4ec93edb | 1555 | { |
b7aa0bf7 | 1556 | struct timeval tv; |
1da177e4 LT |
1557 | if (!sock_flag(sk, SOCK_TIMESTAMP)) |
1558 | sock_enable_timestamp(sk); | |
b7aa0bf7 ED |
1559 | tv = ktime_to_timeval(sk->sk_stamp); |
1560 | if (tv.tv_sec == -1) | |
1da177e4 | 1561 | return -ENOENT; |
b7aa0bf7 ED |
1562 | if (tv.tv_sec == 0) { |
1563 | sk->sk_stamp = ktime_get_real(); | |
1564 | tv = ktime_to_timeval(sk->sk_stamp); | |
1565 | } | |
1566 | return copy_to_user(userstamp, &tv, sizeof(tv)) ? -EFAULT : 0; | |
4ec93edb | 1567 | } |
1da177e4 LT |
1568 | EXPORT_SYMBOL(sock_get_timestamp); |
1569 | ||
1570 | void sock_enable_timestamp(struct sock *sk) | |
4ec93edb YH |
1571 | { |
1572 | if (!sock_flag(sk, SOCK_TIMESTAMP)) { | |
1da177e4 LT |
1573 | sock_set_flag(sk, SOCK_TIMESTAMP); |
1574 | net_enable_timestamp(); | |
1575 | } | |
1576 | } | |
4ec93edb | 1577 | EXPORT_SYMBOL(sock_enable_timestamp); |
1da177e4 LT |
1578 | |
1579 | /* | |
1580 | * Get a socket option on an socket. | |
1581 | * | |
1582 | * FIX: POSIX 1003.1g is very ambiguous here. It states that | |
1583 | * asynchronous errors should be reported by getsockopt. We assume | |
1584 | * this means if you specify SO_ERROR (otherwise whats the point of it). | |
1585 | */ | |
1586 | int sock_common_getsockopt(struct socket *sock, int level, int optname, | |
1587 | char __user *optval, int __user *optlen) | |
1588 | { | |
1589 | struct sock *sk = sock->sk; | |
1590 | ||
1591 | return sk->sk_prot->getsockopt(sk, level, optname, optval, optlen); | |
1592 | } | |
1593 | ||
1594 | EXPORT_SYMBOL(sock_common_getsockopt); | |
1595 | ||
3fdadf7d | 1596 | #ifdef CONFIG_COMPAT |
543d9cfe ACM |
1597 | int compat_sock_common_getsockopt(struct socket *sock, int level, int optname, |
1598 | char __user *optval, int __user *optlen) | |
3fdadf7d DM |
1599 | { |
1600 | struct sock *sk = sock->sk; | |
1601 | ||
1e51f951 | 1602 | if (sk->sk_prot->compat_getsockopt != NULL) |
543d9cfe ACM |
1603 | return sk->sk_prot->compat_getsockopt(sk, level, optname, |
1604 | optval, optlen); | |
3fdadf7d DM |
1605 | return sk->sk_prot->getsockopt(sk, level, optname, optval, optlen); |
1606 | } | |
1607 | EXPORT_SYMBOL(compat_sock_common_getsockopt); | |
1608 | #endif | |
1609 | ||
1da177e4 LT |
1610 | int sock_common_recvmsg(struct kiocb *iocb, struct socket *sock, |
1611 | struct msghdr *msg, size_t size, int flags) | |
1612 | { | |
1613 | struct sock *sk = sock->sk; | |
1614 | int addr_len = 0; | |
1615 | int err; | |
1616 | ||
1617 | err = sk->sk_prot->recvmsg(iocb, sk, msg, size, flags & MSG_DONTWAIT, | |
1618 | flags & ~MSG_DONTWAIT, &addr_len); | |
1619 | if (err >= 0) | |
1620 | msg->msg_namelen = addr_len; | |
1621 | return err; | |
1622 | } | |
1623 | ||
1624 | EXPORT_SYMBOL(sock_common_recvmsg); | |
1625 | ||
1626 | /* | |
1627 | * Set socket options on an inet socket. | |
1628 | */ | |
1629 | int sock_common_setsockopt(struct socket *sock, int level, int optname, | |
1630 | char __user *optval, int optlen) | |
1631 | { | |
1632 | struct sock *sk = sock->sk; | |
1633 | ||
1634 | return sk->sk_prot->setsockopt(sk, level, optname, optval, optlen); | |
1635 | } | |
1636 | ||
1637 | EXPORT_SYMBOL(sock_common_setsockopt); | |
1638 | ||
3fdadf7d | 1639 | #ifdef CONFIG_COMPAT |
543d9cfe ACM |
1640 | int compat_sock_common_setsockopt(struct socket *sock, int level, int optname, |
1641 | char __user *optval, int optlen) | |
3fdadf7d DM |
1642 | { |
1643 | struct sock *sk = sock->sk; | |
1644 | ||
543d9cfe ACM |
1645 | if (sk->sk_prot->compat_setsockopt != NULL) |
1646 | return sk->sk_prot->compat_setsockopt(sk, level, optname, | |
1647 | optval, optlen); | |
3fdadf7d DM |
1648 | return sk->sk_prot->setsockopt(sk, level, optname, optval, optlen); |
1649 | } | |
1650 | EXPORT_SYMBOL(compat_sock_common_setsockopt); | |
1651 | #endif | |
1652 | ||
1da177e4 LT |
1653 | void sk_common_release(struct sock *sk) |
1654 | { | |
1655 | if (sk->sk_prot->destroy) | |
1656 | sk->sk_prot->destroy(sk); | |
1657 | ||
1658 | /* | |
1659 | * Observation: when sock_common_release is called, processes have | |
1660 | * no access to socket. But net still has. | |
1661 | * Step one, detach it from networking: | |
1662 | * | |
1663 | * A. Remove from hash tables. | |
1664 | */ | |
1665 | ||
1666 | sk->sk_prot->unhash(sk); | |
1667 | ||
1668 | /* | |
1669 | * In this point socket cannot receive new packets, but it is possible | |
1670 | * that some packets are in flight because some CPU runs receiver and | |
1671 | * did hash table lookup before we unhashed socket. They will achieve | |
1672 | * receive queue and will be purged by socket destructor. | |
1673 | * | |
1674 | * Also we still have packets pending on receive queue and probably, | |
1675 | * our own packets waiting in device queues. sock_destroy will drain | |
1676 | * receive queue, but transmitted packets will delay socket destruction | |
1677 | * until the last reference will be released. | |
1678 | */ | |
1679 | ||
1680 | sock_orphan(sk); | |
1681 | ||
1682 | xfrm_sk_free_policy(sk); | |
1683 | ||
e6848976 | 1684 | sk_refcnt_debug_release(sk); |
1da177e4 LT |
1685 | sock_put(sk); |
1686 | } | |
1687 | ||
1688 | EXPORT_SYMBOL(sk_common_release); | |
1689 | ||
1690 | static DEFINE_RWLOCK(proto_list_lock); | |
1691 | static LIST_HEAD(proto_list); | |
1692 | ||
1693 | int proto_register(struct proto *prot, int alloc_slab) | |
1694 | { | |
8feaf0c0 ACM |
1695 | char *request_sock_slab_name = NULL; |
1696 | char *timewait_sock_slab_name; | |
1da177e4 LT |
1697 | int rc = -ENOBUFS; |
1698 | ||
1da177e4 LT |
1699 | if (alloc_slab) { |
1700 | prot->slab = kmem_cache_create(prot->name, prot->obj_size, 0, | |
1701 | SLAB_HWCACHE_ALIGN, NULL, NULL); | |
1702 | ||
1703 | if (prot->slab == NULL) { | |
1704 | printk(KERN_CRIT "%s: Can't create sock SLAB cache!\n", | |
1705 | prot->name); | |
2a278051 | 1706 | goto out; |
1da177e4 | 1707 | } |
2e6599cb ACM |
1708 | |
1709 | if (prot->rsk_prot != NULL) { | |
1710 | static const char mask[] = "request_sock_%s"; | |
1711 | ||
1712 | request_sock_slab_name = kmalloc(strlen(prot->name) + sizeof(mask) - 1, GFP_KERNEL); | |
1713 | if (request_sock_slab_name == NULL) | |
1714 | goto out_free_sock_slab; | |
1715 | ||
1716 | sprintf(request_sock_slab_name, mask, prot->name); | |
1717 | prot->rsk_prot->slab = kmem_cache_create(request_sock_slab_name, | |
1718 | prot->rsk_prot->obj_size, 0, | |
1719 | SLAB_HWCACHE_ALIGN, NULL, NULL); | |
1720 | ||
1721 | if (prot->rsk_prot->slab == NULL) { | |
1722 | printk(KERN_CRIT "%s: Can't create request sock SLAB cache!\n", | |
1723 | prot->name); | |
1724 | goto out_free_request_sock_slab_name; | |
1725 | } | |
1726 | } | |
8feaf0c0 | 1727 | |
6d6ee43e | 1728 | if (prot->twsk_prot != NULL) { |
8feaf0c0 ACM |
1729 | static const char mask[] = "tw_sock_%s"; |
1730 | ||
1731 | timewait_sock_slab_name = kmalloc(strlen(prot->name) + sizeof(mask) - 1, GFP_KERNEL); | |
1732 | ||
1733 | if (timewait_sock_slab_name == NULL) | |
1734 | goto out_free_request_sock_slab; | |
1735 | ||
1736 | sprintf(timewait_sock_slab_name, mask, prot->name); | |
6d6ee43e ACM |
1737 | prot->twsk_prot->twsk_slab = |
1738 | kmem_cache_create(timewait_sock_slab_name, | |
1739 | prot->twsk_prot->twsk_obj_size, | |
1740 | 0, SLAB_HWCACHE_ALIGN, | |
1741 | NULL, NULL); | |
1742 | if (prot->twsk_prot->twsk_slab == NULL) | |
8feaf0c0 ACM |
1743 | goto out_free_timewait_sock_slab_name; |
1744 | } | |
1da177e4 LT |
1745 | } |
1746 | ||
2a278051 | 1747 | write_lock(&proto_list_lock); |
1da177e4 | 1748 | list_add(&prot->node, &proto_list); |
1da177e4 | 1749 | write_unlock(&proto_list_lock); |
2a278051 ACM |
1750 | rc = 0; |
1751 | out: | |
1da177e4 | 1752 | return rc; |
8feaf0c0 ACM |
1753 | out_free_timewait_sock_slab_name: |
1754 | kfree(timewait_sock_slab_name); | |
1755 | out_free_request_sock_slab: | |
1756 | if (prot->rsk_prot && prot->rsk_prot->slab) { | |
1757 | kmem_cache_destroy(prot->rsk_prot->slab); | |
1758 | prot->rsk_prot->slab = NULL; | |
1759 | } | |
2e6599cb ACM |
1760 | out_free_request_sock_slab_name: |
1761 | kfree(request_sock_slab_name); | |
1762 | out_free_sock_slab: | |
1763 | kmem_cache_destroy(prot->slab); | |
1764 | prot->slab = NULL; | |
1765 | goto out; | |
1da177e4 LT |
1766 | } |
1767 | ||
1768 | EXPORT_SYMBOL(proto_register); | |
1769 | ||
1770 | void proto_unregister(struct proto *prot) | |
1771 | { | |
1772 | write_lock(&proto_list_lock); | |
0a3f4358 PM |
1773 | list_del(&prot->node); |
1774 | write_unlock(&proto_list_lock); | |
1da177e4 LT |
1775 | |
1776 | if (prot->slab != NULL) { | |
1777 | kmem_cache_destroy(prot->slab); | |
1778 | prot->slab = NULL; | |
1779 | } | |
1780 | ||
2e6599cb ACM |
1781 | if (prot->rsk_prot != NULL && prot->rsk_prot->slab != NULL) { |
1782 | const char *name = kmem_cache_name(prot->rsk_prot->slab); | |
1783 | ||
1784 | kmem_cache_destroy(prot->rsk_prot->slab); | |
1785 | kfree(name); | |
1786 | prot->rsk_prot->slab = NULL; | |
1787 | } | |
1788 | ||
6d6ee43e ACM |
1789 | if (prot->twsk_prot != NULL && prot->twsk_prot->twsk_slab != NULL) { |
1790 | const char *name = kmem_cache_name(prot->twsk_prot->twsk_slab); | |
8feaf0c0 | 1791 | |
6d6ee43e | 1792 | kmem_cache_destroy(prot->twsk_prot->twsk_slab); |
8feaf0c0 | 1793 | kfree(name); |
6d6ee43e | 1794 | prot->twsk_prot->twsk_slab = NULL; |
8feaf0c0 | 1795 | } |
1da177e4 LT |
1796 | } |
1797 | ||
1798 | EXPORT_SYMBOL(proto_unregister); | |
1799 | ||
1800 | #ifdef CONFIG_PROC_FS | |
1801 | static inline struct proto *__proto_head(void) | |
1802 | { | |
1803 | return list_entry(proto_list.next, struct proto, node); | |
1804 | } | |
1805 | ||
1806 | static inline struct proto *proto_head(void) | |
1807 | { | |
1808 | return list_empty(&proto_list) ? NULL : __proto_head(); | |
1809 | } | |
1810 | ||
1811 | static inline struct proto *proto_next(struct proto *proto) | |
1812 | { | |
1813 | return proto->node.next == &proto_list ? NULL : | |
1814 | list_entry(proto->node.next, struct proto, node); | |
1815 | } | |
1816 | ||
1817 | static inline struct proto *proto_get_idx(loff_t pos) | |
1818 | { | |
1819 | struct proto *proto; | |
1820 | loff_t i = 0; | |
1821 | ||
1822 | list_for_each_entry(proto, &proto_list, node) | |
1823 | if (i++ == pos) | |
1824 | goto out; | |
1825 | ||
1826 | proto = NULL; | |
1827 | out: | |
1828 | return proto; | |
1829 | } | |
1830 | ||
1831 | static void *proto_seq_start(struct seq_file *seq, loff_t *pos) | |
1832 | { | |
1833 | read_lock(&proto_list_lock); | |
1834 | return *pos ? proto_get_idx(*pos - 1) : SEQ_START_TOKEN; | |
1835 | } | |
1836 | ||
1837 | static void *proto_seq_next(struct seq_file *seq, void *v, loff_t *pos) | |
1838 | { | |
1839 | ++*pos; | |
1840 | return v == SEQ_START_TOKEN ? proto_head() : proto_next(v); | |
1841 | } | |
1842 | ||
1843 | static void proto_seq_stop(struct seq_file *seq, void *v) | |
1844 | { | |
1845 | read_unlock(&proto_list_lock); | |
1846 | } | |
1847 | ||
1848 | static char proto_method_implemented(const void *method) | |
1849 | { | |
1850 | return method == NULL ? 'n' : 'y'; | |
1851 | } | |
1852 | ||
1853 | static void proto_seq_printf(struct seq_file *seq, struct proto *proto) | |
1854 | { | |
1855 | seq_printf(seq, "%-9s %4u %6d %6d %-3s %6u %-3s %-10s " | |
1856 | "%2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c\n", | |
1857 | proto->name, | |
1858 | proto->obj_size, | |
1859 | proto->sockets_allocated != NULL ? atomic_read(proto->sockets_allocated) : -1, | |
1860 | proto->memory_allocated != NULL ? atomic_read(proto->memory_allocated) : -1, | |
1861 | proto->memory_pressure != NULL ? *proto->memory_pressure ? "yes" : "no" : "NI", | |
1862 | proto->max_header, | |
1863 | proto->slab == NULL ? "no" : "yes", | |
1864 | module_name(proto->owner), | |
1865 | proto_method_implemented(proto->close), | |
1866 | proto_method_implemented(proto->connect), | |
1867 | proto_method_implemented(proto->disconnect), | |
1868 | proto_method_implemented(proto->accept), | |
1869 | proto_method_implemented(proto->ioctl), | |
1870 | proto_method_implemented(proto->init), | |
1871 | proto_method_implemented(proto->destroy), | |
1872 | proto_method_implemented(proto->shutdown), | |
1873 | proto_method_implemented(proto->setsockopt), | |
1874 | proto_method_implemented(proto->getsockopt), | |
1875 | proto_method_implemented(proto->sendmsg), | |
1876 | proto_method_implemented(proto->recvmsg), | |
1877 | proto_method_implemented(proto->sendpage), | |
1878 | proto_method_implemented(proto->bind), | |
1879 | proto_method_implemented(proto->backlog_rcv), | |
1880 | proto_method_implemented(proto->hash), | |
1881 | proto_method_implemented(proto->unhash), | |
1882 | proto_method_implemented(proto->get_port), | |
1883 | proto_method_implemented(proto->enter_memory_pressure)); | |
1884 | } | |
1885 | ||
1886 | static int proto_seq_show(struct seq_file *seq, void *v) | |
1887 | { | |
1888 | if (v == SEQ_START_TOKEN) | |
1889 | seq_printf(seq, "%-9s %-4s %-8s %-6s %-5s %-7s %-4s %-10s %s", | |
1890 | "protocol", | |
1891 | "size", | |
1892 | "sockets", | |
1893 | "memory", | |
1894 | "press", | |
1895 | "maxhdr", | |
1896 | "slab", | |
1897 | "module", | |
1898 | "cl co di ac io in de sh ss gs se re sp bi br ha uh gp em\n"); | |
1899 | else | |
1900 | proto_seq_printf(seq, v); | |
1901 | return 0; | |
1902 | } | |
1903 | ||
1904 | static struct seq_operations proto_seq_ops = { | |
1905 | .start = proto_seq_start, | |
1906 | .next = proto_seq_next, | |
1907 | .stop = proto_seq_stop, | |
1908 | .show = proto_seq_show, | |
1909 | }; | |
1910 | ||
1911 | static int proto_seq_open(struct inode *inode, struct file *file) | |
1912 | { | |
1913 | return seq_open(file, &proto_seq_ops); | |
1914 | } | |
1915 | ||
9a32144e | 1916 | static const struct file_operations proto_seq_fops = { |
1da177e4 LT |
1917 | .owner = THIS_MODULE, |
1918 | .open = proto_seq_open, | |
1919 | .read = seq_read, | |
1920 | .llseek = seq_lseek, | |
1921 | .release = seq_release, | |
1922 | }; | |
1923 | ||
1924 | static int __init proto_init(void) | |
1925 | { | |
1926 | /* register /proc/net/protocols */ | |
1927 | return proc_net_fops_create("protocols", S_IRUGO, &proto_seq_fops) == NULL ? -ENOBUFS : 0; | |
1928 | } | |
1929 | ||
1930 | subsys_initcall(proto_init); | |
1931 | ||
1932 | #endif /* PROC_FS */ | |
1933 | ||
1934 | EXPORT_SYMBOL(sk_alloc); | |
1935 | EXPORT_SYMBOL(sk_free); | |
1936 | EXPORT_SYMBOL(sk_send_sigurg); | |
1937 | EXPORT_SYMBOL(sock_alloc_send_skb); | |
1938 | EXPORT_SYMBOL(sock_init_data); | |
1939 | EXPORT_SYMBOL(sock_kfree_s); | |
1940 | EXPORT_SYMBOL(sock_kmalloc); | |
1941 | EXPORT_SYMBOL(sock_no_accept); | |
1942 | EXPORT_SYMBOL(sock_no_bind); | |
1943 | EXPORT_SYMBOL(sock_no_connect); | |
1944 | EXPORT_SYMBOL(sock_no_getname); | |
1945 | EXPORT_SYMBOL(sock_no_getsockopt); | |
1946 | EXPORT_SYMBOL(sock_no_ioctl); | |
1947 | EXPORT_SYMBOL(sock_no_listen); | |
1948 | EXPORT_SYMBOL(sock_no_mmap); | |
1949 | EXPORT_SYMBOL(sock_no_poll); | |
1950 | EXPORT_SYMBOL(sock_no_recvmsg); | |
1951 | EXPORT_SYMBOL(sock_no_sendmsg); | |
1952 | EXPORT_SYMBOL(sock_no_sendpage); | |
1953 | EXPORT_SYMBOL(sock_no_setsockopt); | |
1954 | EXPORT_SYMBOL(sock_no_shutdown); | |
1955 | EXPORT_SYMBOL(sock_no_socketpair); | |
1956 | EXPORT_SYMBOL(sock_rfree); | |
1957 | EXPORT_SYMBOL(sock_setsockopt); | |
1958 | EXPORT_SYMBOL(sock_wfree); | |
1959 | EXPORT_SYMBOL(sock_wmalloc); | |
1960 | EXPORT_SYMBOL(sock_i_uid); | |
1961 | EXPORT_SYMBOL(sock_i_ino); | |
1da177e4 | 1962 | EXPORT_SYMBOL(sysctl_optmem_max); |
6baf1f41 | 1963 | #ifdef CONFIG_SYSCTL |
1da177e4 LT |
1964 | EXPORT_SYMBOL(sysctl_rmem_max); |
1965 | EXPORT_SYMBOL(sysctl_wmem_max); | |
1966 | #endif |