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> | |
457c4cbc | 122 | #include <net/net_namespace.h> |
2e6599cb | 123 | #include <net/request_sock.h> |
1da177e4 LT |
124 | #include <net/sock.h> |
125 | #include <net/xfrm.h> | |
126 | #include <linux/ipsec.h> | |
127 | ||
128 | #include <linux/filter.h> | |
129 | ||
130 | #ifdef CONFIG_INET | |
131 | #include <net/tcp.h> | |
132 | #endif | |
133 | ||
da21f24d IM |
134 | /* |
135 | * Each address family might have different locking rules, so we have | |
136 | * one slock key per address family: | |
137 | */ | |
a5b5bb9a IM |
138 | static struct lock_class_key af_family_keys[AF_MAX]; |
139 | static struct lock_class_key af_family_slock_keys[AF_MAX]; | |
140 | ||
141 | #ifdef CONFIG_DEBUG_LOCK_ALLOC | |
142 | /* | |
143 | * Make lock validator output more readable. (we pre-construct these | |
144 | * strings build-time, so that runtime initialization of socket | |
145 | * locks is fast): | |
146 | */ | |
147 | static const char *af_family_key_strings[AF_MAX+1] = { | |
148 | "sk_lock-AF_UNSPEC", "sk_lock-AF_UNIX" , "sk_lock-AF_INET" , | |
149 | "sk_lock-AF_AX25" , "sk_lock-AF_IPX" , "sk_lock-AF_APPLETALK", | |
150 | "sk_lock-AF_NETROM", "sk_lock-AF_BRIDGE" , "sk_lock-AF_ATMPVC" , | |
151 | "sk_lock-AF_X25" , "sk_lock-AF_INET6" , "sk_lock-AF_ROSE" , | |
152 | "sk_lock-AF_DECnet", "sk_lock-AF_NETBEUI" , "sk_lock-AF_SECURITY" , | |
153 | "sk_lock-AF_KEY" , "sk_lock-AF_NETLINK" , "sk_lock-AF_PACKET" , | |
154 | "sk_lock-AF_ASH" , "sk_lock-AF_ECONET" , "sk_lock-AF_ATMSVC" , | |
155 | "sk_lock-21" , "sk_lock-AF_SNA" , "sk_lock-AF_IRDA" , | |
156 | "sk_lock-AF_PPPOX" , "sk_lock-AF_WANPIPE" , "sk_lock-AF_LLC" , | |
cd05acfe | 157 | "sk_lock-27" , "sk_lock-28" , "sk_lock-AF_CAN" , |
17926a79 DH |
158 | "sk_lock-AF_TIPC" , "sk_lock-AF_BLUETOOTH", "sk_lock-IUCV" , |
159 | "sk_lock-AF_RXRPC" , "sk_lock-AF_MAX" | |
a5b5bb9a IM |
160 | }; |
161 | static const char *af_family_slock_key_strings[AF_MAX+1] = { | |
162 | "slock-AF_UNSPEC", "slock-AF_UNIX" , "slock-AF_INET" , | |
163 | "slock-AF_AX25" , "slock-AF_IPX" , "slock-AF_APPLETALK", | |
164 | "slock-AF_NETROM", "slock-AF_BRIDGE" , "slock-AF_ATMPVC" , | |
165 | "slock-AF_X25" , "slock-AF_INET6" , "slock-AF_ROSE" , | |
166 | "slock-AF_DECnet", "slock-AF_NETBEUI" , "slock-AF_SECURITY" , | |
167 | "slock-AF_KEY" , "slock-AF_NETLINK" , "slock-AF_PACKET" , | |
168 | "slock-AF_ASH" , "slock-AF_ECONET" , "slock-AF_ATMSVC" , | |
169 | "slock-21" , "slock-AF_SNA" , "slock-AF_IRDA" , | |
170 | "slock-AF_PPPOX" , "slock-AF_WANPIPE" , "slock-AF_LLC" , | |
cd05acfe | 171 | "slock-27" , "slock-28" , "slock-AF_CAN" , |
17926a79 DH |
172 | "slock-AF_TIPC" , "slock-AF_BLUETOOTH", "slock-AF_IUCV" , |
173 | "slock-AF_RXRPC" , "slock-AF_MAX" | |
a5b5bb9a | 174 | }; |
443aef0e PZ |
175 | static const char *af_family_clock_key_strings[AF_MAX+1] = { |
176 | "clock-AF_UNSPEC", "clock-AF_UNIX" , "clock-AF_INET" , | |
177 | "clock-AF_AX25" , "clock-AF_IPX" , "clock-AF_APPLETALK", | |
178 | "clock-AF_NETROM", "clock-AF_BRIDGE" , "clock-AF_ATMPVC" , | |
179 | "clock-AF_X25" , "clock-AF_INET6" , "clock-AF_ROSE" , | |
180 | "clock-AF_DECnet", "clock-AF_NETBEUI" , "clock-AF_SECURITY" , | |
181 | "clock-AF_KEY" , "clock-AF_NETLINK" , "clock-AF_PACKET" , | |
182 | "clock-AF_ASH" , "clock-AF_ECONET" , "clock-AF_ATMSVC" , | |
183 | "clock-21" , "clock-AF_SNA" , "clock-AF_IRDA" , | |
184 | "clock-AF_PPPOX" , "clock-AF_WANPIPE" , "clock-AF_LLC" , | |
185 | "clock-27" , "clock-28" , "clock-29" , | |
e51f802b DH |
186 | "clock-AF_TIPC" , "clock-AF_BLUETOOTH", "clock-AF_IUCV" , |
187 | "clock-AF_RXRPC" , "clock-AF_MAX" | |
443aef0e | 188 | }; |
a5b5bb9a | 189 | #endif |
da21f24d IM |
190 | |
191 | /* | |
192 | * sk_callback_lock locking rules are per-address-family, | |
193 | * so split the lock classes by using a per-AF key: | |
194 | */ | |
195 | static struct lock_class_key af_callback_keys[AF_MAX]; | |
196 | ||
1da177e4 LT |
197 | /* Take into consideration the size of the struct sk_buff overhead in the |
198 | * determination of these values, since that is non-constant across | |
199 | * platforms. This makes socket queueing behavior and performance | |
200 | * not depend upon such differences. | |
201 | */ | |
202 | #define _SK_MEM_PACKETS 256 | |
203 | #define _SK_MEM_OVERHEAD (sizeof(struct sk_buff) + 256) | |
204 | #define SK_WMEM_MAX (_SK_MEM_OVERHEAD * _SK_MEM_PACKETS) | |
205 | #define SK_RMEM_MAX (_SK_MEM_OVERHEAD * _SK_MEM_PACKETS) | |
206 | ||
207 | /* Run time adjustable parameters. */ | |
ab32ea5d BH |
208 | __u32 sysctl_wmem_max __read_mostly = SK_WMEM_MAX; |
209 | __u32 sysctl_rmem_max __read_mostly = SK_RMEM_MAX; | |
210 | __u32 sysctl_wmem_default __read_mostly = SK_WMEM_MAX; | |
211 | __u32 sysctl_rmem_default __read_mostly = SK_RMEM_MAX; | |
1da177e4 LT |
212 | |
213 | /* Maximal space eaten by iovec or ancilliary data plus some space */ | |
ab32ea5d | 214 | int sysctl_optmem_max __read_mostly = sizeof(unsigned long)*(2*UIO_MAXIOV+512); |
1da177e4 LT |
215 | |
216 | static int sock_set_timeout(long *timeo_p, char __user *optval, int optlen) | |
217 | { | |
218 | struct timeval tv; | |
219 | ||
220 | if (optlen < sizeof(tv)) | |
221 | return -EINVAL; | |
222 | if (copy_from_user(&tv, optval, sizeof(tv))) | |
223 | return -EFAULT; | |
ba78073e VA |
224 | if (tv.tv_usec < 0 || tv.tv_usec >= USEC_PER_SEC) |
225 | return -EDOM; | |
1da177e4 | 226 | |
ba78073e | 227 | if (tv.tv_sec < 0) { |
6f11df83 AM |
228 | static int warned __read_mostly; |
229 | ||
ba78073e VA |
230 | *timeo_p = 0; |
231 | if (warned < 10 && net_ratelimit()) | |
232 | warned++; | |
233 | printk(KERN_INFO "sock_set_timeout: `%s' (pid %d) " | |
234 | "tries to set negative timeout\n", | |
ba25f9dc | 235 | current->comm, task_pid_nr(current)); |
ba78073e VA |
236 | return 0; |
237 | } | |
1da177e4 LT |
238 | *timeo_p = MAX_SCHEDULE_TIMEOUT; |
239 | if (tv.tv_sec == 0 && tv.tv_usec == 0) | |
240 | return 0; | |
241 | if (tv.tv_sec < (MAX_SCHEDULE_TIMEOUT/HZ - 1)) | |
242 | *timeo_p = tv.tv_sec*HZ + (tv.tv_usec+(1000000/HZ-1))/(1000000/HZ); | |
243 | return 0; | |
244 | } | |
245 | ||
246 | static void sock_warn_obsolete_bsdism(const char *name) | |
247 | { | |
248 | static int warned; | |
249 | static char warncomm[TASK_COMM_LEN]; | |
4ec93edb YH |
250 | if (strcmp(warncomm, current->comm) && warned < 5) { |
251 | strcpy(warncomm, current->comm); | |
1da177e4 LT |
252 | printk(KERN_WARNING "process `%s' is using obsolete " |
253 | "%s SO_BSDCOMPAT\n", warncomm, name); | |
254 | warned++; | |
255 | } | |
256 | } | |
257 | ||
258 | static void sock_disable_timestamp(struct sock *sk) | |
4ec93edb YH |
259 | { |
260 | if (sock_flag(sk, SOCK_TIMESTAMP)) { | |
1da177e4 LT |
261 | sock_reset_flag(sk, SOCK_TIMESTAMP); |
262 | net_disable_timestamp(); | |
263 | } | |
264 | } | |
265 | ||
266 | ||
f0088a50 DV |
267 | int sock_queue_rcv_skb(struct sock *sk, struct sk_buff *skb) |
268 | { | |
269 | int err = 0; | |
270 | int skb_len; | |
271 | ||
272 | /* Cast skb->rcvbuf to unsigned... It's pointless, but reduces | |
273 | number of warnings when compiling with -W --ANK | |
274 | */ | |
275 | if (atomic_read(&sk->sk_rmem_alloc) + skb->truesize >= | |
276 | (unsigned)sk->sk_rcvbuf) { | |
277 | err = -ENOMEM; | |
278 | goto out; | |
279 | } | |
280 | ||
fda9ef5d | 281 | err = sk_filter(sk, skb); |
f0088a50 DV |
282 | if (err) |
283 | goto out; | |
284 | ||
3ab224be HA |
285 | if (!sk_rmem_schedule(sk, skb->truesize)) { |
286 | err = -ENOBUFS; | |
287 | goto out; | |
288 | } | |
289 | ||
f0088a50 DV |
290 | skb->dev = NULL; |
291 | skb_set_owner_r(skb, sk); | |
292 | ||
293 | /* Cache the SKB length before we tack it onto the receive | |
294 | * queue. Once it is added it no longer belongs to us and | |
295 | * may be freed by other threads of control pulling packets | |
296 | * from the queue. | |
297 | */ | |
298 | skb_len = skb->len; | |
299 | ||
300 | skb_queue_tail(&sk->sk_receive_queue, skb); | |
301 | ||
302 | if (!sock_flag(sk, SOCK_DEAD)) | |
303 | sk->sk_data_ready(sk, skb_len); | |
304 | out: | |
305 | return err; | |
306 | } | |
307 | EXPORT_SYMBOL(sock_queue_rcv_skb); | |
308 | ||
58a5a7b9 | 309 | int sk_receive_skb(struct sock *sk, struct sk_buff *skb, const int nested) |
f0088a50 DV |
310 | { |
311 | int rc = NET_RX_SUCCESS; | |
312 | ||
fda9ef5d | 313 | if (sk_filter(sk, skb)) |
f0088a50 DV |
314 | goto discard_and_relse; |
315 | ||
316 | skb->dev = NULL; | |
317 | ||
58a5a7b9 ACM |
318 | if (nested) |
319 | bh_lock_sock_nested(sk); | |
320 | else | |
321 | bh_lock_sock(sk); | |
a5b5bb9a IM |
322 | if (!sock_owned_by_user(sk)) { |
323 | /* | |
324 | * trylock + unlock semantics: | |
325 | */ | |
326 | mutex_acquire(&sk->sk_lock.dep_map, 0, 1, _RET_IP_); | |
327 | ||
f0088a50 | 328 | rc = sk->sk_backlog_rcv(sk, skb); |
a5b5bb9a IM |
329 | |
330 | mutex_release(&sk->sk_lock.dep_map, 1, _RET_IP_); | |
331 | } else | |
f0088a50 DV |
332 | sk_add_backlog(sk, skb); |
333 | bh_unlock_sock(sk); | |
334 | out: | |
335 | sock_put(sk); | |
336 | return rc; | |
337 | discard_and_relse: | |
338 | kfree_skb(skb); | |
339 | goto out; | |
340 | } | |
341 | EXPORT_SYMBOL(sk_receive_skb); | |
342 | ||
343 | struct dst_entry *__sk_dst_check(struct sock *sk, u32 cookie) | |
344 | { | |
345 | struct dst_entry *dst = sk->sk_dst_cache; | |
346 | ||
347 | if (dst && dst->obsolete && dst->ops->check(dst, cookie) == NULL) { | |
348 | sk->sk_dst_cache = NULL; | |
349 | dst_release(dst); | |
350 | return NULL; | |
351 | } | |
352 | ||
353 | return dst; | |
354 | } | |
355 | EXPORT_SYMBOL(__sk_dst_check); | |
356 | ||
357 | struct dst_entry *sk_dst_check(struct sock *sk, u32 cookie) | |
358 | { | |
359 | struct dst_entry *dst = sk_dst_get(sk); | |
360 | ||
361 | if (dst && dst->obsolete && dst->ops->check(dst, cookie) == NULL) { | |
362 | sk_dst_reset(sk); | |
363 | dst_release(dst); | |
364 | return NULL; | |
365 | } | |
366 | ||
367 | return dst; | |
368 | } | |
369 | EXPORT_SYMBOL(sk_dst_check); | |
370 | ||
4878809f DM |
371 | static int sock_bindtodevice(struct sock *sk, char __user *optval, int optlen) |
372 | { | |
373 | int ret = -ENOPROTOOPT; | |
374 | #ifdef CONFIG_NETDEVICES | |
881d966b | 375 | struct net *net = sk->sk_net; |
4878809f DM |
376 | char devname[IFNAMSIZ]; |
377 | int index; | |
378 | ||
379 | /* Sorry... */ | |
380 | ret = -EPERM; | |
381 | if (!capable(CAP_NET_RAW)) | |
382 | goto out; | |
383 | ||
384 | ret = -EINVAL; | |
385 | if (optlen < 0) | |
386 | goto out; | |
387 | ||
388 | /* Bind this socket to a particular device like "eth0", | |
389 | * as specified in the passed interface name. If the | |
390 | * name is "" or the option length is zero the socket | |
391 | * is not bound. | |
392 | */ | |
393 | if (optlen > IFNAMSIZ - 1) | |
394 | optlen = IFNAMSIZ - 1; | |
395 | memset(devname, 0, sizeof(devname)); | |
396 | ||
397 | ret = -EFAULT; | |
398 | if (copy_from_user(devname, optval, optlen)) | |
399 | goto out; | |
400 | ||
401 | if (devname[0] == '\0') { | |
402 | index = 0; | |
403 | } else { | |
881d966b | 404 | struct net_device *dev = dev_get_by_name(net, devname); |
4878809f DM |
405 | |
406 | ret = -ENODEV; | |
407 | if (!dev) | |
408 | goto out; | |
409 | ||
410 | index = dev->ifindex; | |
411 | dev_put(dev); | |
412 | } | |
413 | ||
414 | lock_sock(sk); | |
415 | sk->sk_bound_dev_if = index; | |
416 | sk_dst_reset(sk); | |
417 | release_sock(sk); | |
418 | ||
419 | ret = 0; | |
420 | ||
421 | out: | |
422 | #endif | |
423 | ||
424 | return ret; | |
425 | } | |
426 | ||
c0ef877b PE |
427 | static inline void sock_valbool_flag(struct sock *sk, int bit, int valbool) |
428 | { | |
429 | if (valbool) | |
430 | sock_set_flag(sk, bit); | |
431 | else | |
432 | sock_reset_flag(sk, bit); | |
433 | } | |
434 | ||
1da177e4 LT |
435 | /* |
436 | * This is meant for all protocols to use and covers goings on | |
437 | * at the socket level. Everything here is generic. | |
438 | */ | |
439 | ||
440 | int sock_setsockopt(struct socket *sock, int level, int optname, | |
441 | char __user *optval, int optlen) | |
442 | { | |
443 | struct sock *sk=sock->sk; | |
1da177e4 LT |
444 | int val; |
445 | int valbool; | |
446 | struct linger ling; | |
447 | int ret = 0; | |
4ec93edb | 448 | |
1da177e4 LT |
449 | /* |
450 | * Options without arguments | |
451 | */ | |
452 | ||
453 | #ifdef SO_DONTLINGER /* Compatibility item... */ | |
a77be819 KM |
454 | if (optname == SO_DONTLINGER) { |
455 | lock_sock(sk); | |
456 | sock_reset_flag(sk, SOCK_LINGER); | |
457 | release_sock(sk); | |
458 | return 0; | |
1da177e4 | 459 | } |
a77be819 | 460 | #endif |
4ec93edb | 461 | |
4878809f DM |
462 | if (optname == SO_BINDTODEVICE) |
463 | return sock_bindtodevice(sk, optval, optlen); | |
464 | ||
e71a4783 SH |
465 | if (optlen < sizeof(int)) |
466 | return -EINVAL; | |
4ec93edb | 467 | |
1da177e4 LT |
468 | if (get_user(val, (int __user *)optval)) |
469 | return -EFAULT; | |
4ec93edb YH |
470 | |
471 | valbool = val?1:0; | |
1da177e4 LT |
472 | |
473 | lock_sock(sk); | |
474 | ||
e71a4783 SH |
475 | switch(optname) { |
476 | case SO_DEBUG: | |
477 | if (val && !capable(CAP_NET_ADMIN)) { | |
478 | ret = -EACCES; | |
c0ef877b PE |
479 | } else |
480 | sock_valbool_flag(sk, SOCK_DBG, valbool); | |
e71a4783 SH |
481 | break; |
482 | case SO_REUSEADDR: | |
483 | sk->sk_reuse = valbool; | |
484 | break; | |
485 | case SO_TYPE: | |
486 | case SO_ERROR: | |
487 | ret = -ENOPROTOOPT; | |
488 | break; | |
489 | case SO_DONTROUTE: | |
c0ef877b | 490 | sock_valbool_flag(sk, SOCK_LOCALROUTE, valbool); |
e71a4783 SH |
491 | break; |
492 | case SO_BROADCAST: | |
493 | sock_valbool_flag(sk, SOCK_BROADCAST, valbool); | |
494 | break; | |
495 | case SO_SNDBUF: | |
496 | /* Don't error on this BSD doesn't and if you think | |
497 | about it this is right. Otherwise apps have to | |
498 | play 'guess the biggest size' games. RCVBUF/SNDBUF | |
499 | are treated in BSD as hints */ | |
500 | ||
501 | if (val > sysctl_wmem_max) | |
502 | val = sysctl_wmem_max; | |
b0573dea | 503 | set_sndbuf: |
e71a4783 SH |
504 | sk->sk_userlocks |= SOCK_SNDBUF_LOCK; |
505 | if ((val * 2) < SOCK_MIN_SNDBUF) | |
506 | sk->sk_sndbuf = SOCK_MIN_SNDBUF; | |
507 | else | |
508 | sk->sk_sndbuf = val * 2; | |
1da177e4 | 509 | |
e71a4783 SH |
510 | /* |
511 | * Wake up sending tasks if we | |
512 | * upped the value. | |
513 | */ | |
514 | sk->sk_write_space(sk); | |
515 | break; | |
1da177e4 | 516 | |
e71a4783 SH |
517 | case SO_SNDBUFFORCE: |
518 | if (!capable(CAP_NET_ADMIN)) { | |
519 | ret = -EPERM; | |
520 | break; | |
521 | } | |
522 | goto set_sndbuf; | |
b0573dea | 523 | |
e71a4783 SH |
524 | case SO_RCVBUF: |
525 | /* Don't error on this BSD doesn't and if you think | |
526 | about it this is right. Otherwise apps have to | |
527 | play 'guess the biggest size' games. RCVBUF/SNDBUF | |
528 | are treated in BSD as hints */ | |
4ec93edb | 529 | |
e71a4783 SH |
530 | if (val > sysctl_rmem_max) |
531 | val = sysctl_rmem_max; | |
b0573dea | 532 | set_rcvbuf: |
e71a4783 SH |
533 | sk->sk_userlocks |= SOCK_RCVBUF_LOCK; |
534 | /* | |
535 | * We double it on the way in to account for | |
536 | * "struct sk_buff" etc. overhead. Applications | |
537 | * assume that the SO_RCVBUF setting they make will | |
538 | * allow that much actual data to be received on that | |
539 | * socket. | |
540 | * | |
541 | * Applications are unaware that "struct sk_buff" and | |
542 | * other overheads allocate from the receive buffer | |
543 | * during socket buffer allocation. | |
544 | * | |
545 | * And after considering the possible alternatives, | |
546 | * returning the value we actually used in getsockopt | |
547 | * is the most desirable behavior. | |
548 | */ | |
549 | if ((val * 2) < SOCK_MIN_RCVBUF) | |
550 | sk->sk_rcvbuf = SOCK_MIN_RCVBUF; | |
551 | else | |
552 | sk->sk_rcvbuf = val * 2; | |
553 | break; | |
554 | ||
555 | case SO_RCVBUFFORCE: | |
556 | if (!capable(CAP_NET_ADMIN)) { | |
557 | ret = -EPERM; | |
1da177e4 | 558 | break; |
e71a4783 SH |
559 | } |
560 | goto set_rcvbuf; | |
1da177e4 | 561 | |
e71a4783 | 562 | case SO_KEEPALIVE: |
1da177e4 | 563 | #ifdef CONFIG_INET |
e71a4783 SH |
564 | if (sk->sk_protocol == IPPROTO_TCP) |
565 | tcp_set_keepalive(sk, valbool); | |
1da177e4 | 566 | #endif |
e71a4783 SH |
567 | sock_valbool_flag(sk, SOCK_KEEPOPEN, valbool); |
568 | break; | |
569 | ||
570 | case SO_OOBINLINE: | |
571 | sock_valbool_flag(sk, SOCK_URGINLINE, valbool); | |
572 | break; | |
573 | ||
574 | case SO_NO_CHECK: | |
575 | sk->sk_no_check = valbool; | |
576 | break; | |
577 | ||
578 | case SO_PRIORITY: | |
579 | if ((val >= 0 && val <= 6) || capable(CAP_NET_ADMIN)) | |
580 | sk->sk_priority = val; | |
581 | else | |
582 | ret = -EPERM; | |
583 | break; | |
584 | ||
585 | case SO_LINGER: | |
586 | if (optlen < sizeof(ling)) { | |
587 | ret = -EINVAL; /* 1003.1g */ | |
1da177e4 | 588 | break; |
e71a4783 SH |
589 | } |
590 | if (copy_from_user(&ling,optval,sizeof(ling))) { | |
591 | ret = -EFAULT; | |
1da177e4 | 592 | break; |
e71a4783 SH |
593 | } |
594 | if (!ling.l_onoff) | |
595 | sock_reset_flag(sk, SOCK_LINGER); | |
596 | else { | |
1da177e4 | 597 | #if (BITS_PER_LONG == 32) |
e71a4783 SH |
598 | if ((unsigned int)ling.l_linger >= MAX_SCHEDULE_TIMEOUT/HZ) |
599 | sk->sk_lingertime = MAX_SCHEDULE_TIMEOUT; | |
1da177e4 | 600 | else |
e71a4783 SH |
601 | #endif |
602 | sk->sk_lingertime = (unsigned int)ling.l_linger * HZ; | |
603 | sock_set_flag(sk, SOCK_LINGER); | |
604 | } | |
605 | break; | |
606 | ||
607 | case SO_BSDCOMPAT: | |
608 | sock_warn_obsolete_bsdism("setsockopt"); | |
609 | break; | |
610 | ||
611 | case SO_PASSCRED: | |
612 | if (valbool) | |
613 | set_bit(SOCK_PASSCRED, &sock->flags); | |
614 | else | |
615 | clear_bit(SOCK_PASSCRED, &sock->flags); | |
616 | break; | |
617 | ||
618 | case SO_TIMESTAMP: | |
92f37fd2 | 619 | case SO_TIMESTAMPNS: |
e71a4783 | 620 | if (valbool) { |
92f37fd2 ED |
621 | if (optname == SO_TIMESTAMP) |
622 | sock_reset_flag(sk, SOCK_RCVTSTAMPNS); | |
623 | else | |
624 | sock_set_flag(sk, SOCK_RCVTSTAMPNS); | |
e71a4783 SH |
625 | sock_set_flag(sk, SOCK_RCVTSTAMP); |
626 | sock_enable_timestamp(sk); | |
92f37fd2 | 627 | } else { |
e71a4783 | 628 | sock_reset_flag(sk, SOCK_RCVTSTAMP); |
92f37fd2 ED |
629 | sock_reset_flag(sk, SOCK_RCVTSTAMPNS); |
630 | } | |
e71a4783 SH |
631 | break; |
632 | ||
633 | case SO_RCVLOWAT: | |
634 | if (val < 0) | |
635 | val = INT_MAX; | |
636 | sk->sk_rcvlowat = val ? : 1; | |
637 | break; | |
638 | ||
639 | case SO_RCVTIMEO: | |
640 | ret = sock_set_timeout(&sk->sk_rcvtimeo, optval, optlen); | |
641 | break; | |
642 | ||
643 | case SO_SNDTIMEO: | |
644 | ret = sock_set_timeout(&sk->sk_sndtimeo, optval, optlen); | |
645 | break; | |
1da177e4 | 646 | |
e71a4783 SH |
647 | case SO_ATTACH_FILTER: |
648 | ret = -EINVAL; | |
649 | if (optlen == sizeof(struct sock_fprog)) { | |
650 | struct sock_fprog fprog; | |
1da177e4 | 651 | |
e71a4783 SH |
652 | ret = -EFAULT; |
653 | if (copy_from_user(&fprog, optval, sizeof(fprog))) | |
1da177e4 | 654 | break; |
e71a4783 SH |
655 | |
656 | ret = sk_attach_filter(&fprog, sk); | |
657 | } | |
658 | break; | |
659 | ||
660 | case SO_DETACH_FILTER: | |
55b33325 | 661 | ret = sk_detach_filter(sk); |
e71a4783 | 662 | break; |
1da177e4 | 663 | |
e71a4783 SH |
664 | case SO_PASSSEC: |
665 | if (valbool) | |
666 | set_bit(SOCK_PASSSEC, &sock->flags); | |
667 | else | |
668 | clear_bit(SOCK_PASSSEC, &sock->flags); | |
669 | break; | |
4a19ec58 LAT |
670 | case SO_MARK: |
671 | if (!capable(CAP_NET_ADMIN)) | |
672 | ret = -EPERM; | |
673 | else { | |
674 | sk->sk_mark = val; | |
675 | } | |
676 | break; | |
877ce7c1 | 677 | |
1da177e4 LT |
678 | /* We implement the SO_SNDLOWAT etc to |
679 | not be settable (1003.1g 5.3) */ | |
e71a4783 SH |
680 | default: |
681 | ret = -ENOPROTOOPT; | |
682 | break; | |
4ec93edb | 683 | } |
1da177e4 LT |
684 | release_sock(sk); |
685 | return ret; | |
686 | } | |
687 | ||
688 | ||
689 | int sock_getsockopt(struct socket *sock, int level, int optname, | |
690 | char __user *optval, int __user *optlen) | |
691 | { | |
692 | struct sock *sk = sock->sk; | |
4ec93edb | 693 | |
e71a4783 | 694 | union { |
4ec93edb YH |
695 | int val; |
696 | struct linger ling; | |
1da177e4 LT |
697 | struct timeval tm; |
698 | } v; | |
4ec93edb | 699 | |
1da177e4 LT |
700 | unsigned int lv = sizeof(int); |
701 | int len; | |
4ec93edb | 702 | |
e71a4783 | 703 | if (get_user(len, optlen)) |
4ec93edb | 704 | return -EFAULT; |
e71a4783 | 705 | if (len < 0) |
1da177e4 | 706 | return -EINVAL; |
4ec93edb | 707 | |
e71a4783 SH |
708 | switch(optname) { |
709 | case SO_DEBUG: | |
710 | v.val = sock_flag(sk, SOCK_DBG); | |
711 | break; | |
712 | ||
713 | case SO_DONTROUTE: | |
714 | v.val = sock_flag(sk, SOCK_LOCALROUTE); | |
715 | break; | |
716 | ||
717 | case SO_BROADCAST: | |
718 | v.val = !!sock_flag(sk, SOCK_BROADCAST); | |
719 | break; | |
720 | ||
721 | case SO_SNDBUF: | |
722 | v.val = sk->sk_sndbuf; | |
723 | break; | |
724 | ||
725 | case SO_RCVBUF: | |
726 | v.val = sk->sk_rcvbuf; | |
727 | break; | |
728 | ||
729 | case SO_REUSEADDR: | |
730 | v.val = sk->sk_reuse; | |
731 | break; | |
732 | ||
733 | case SO_KEEPALIVE: | |
734 | v.val = !!sock_flag(sk, SOCK_KEEPOPEN); | |
735 | break; | |
736 | ||
737 | case SO_TYPE: | |
738 | v.val = sk->sk_type; | |
739 | break; | |
740 | ||
741 | case SO_ERROR: | |
742 | v.val = -sock_error(sk); | |
743 | if (v.val==0) | |
744 | v.val = xchg(&sk->sk_err_soft, 0); | |
745 | break; | |
746 | ||
747 | case SO_OOBINLINE: | |
748 | v.val = !!sock_flag(sk, SOCK_URGINLINE); | |
749 | break; | |
750 | ||
751 | case SO_NO_CHECK: | |
752 | v.val = sk->sk_no_check; | |
753 | break; | |
754 | ||
755 | case SO_PRIORITY: | |
756 | v.val = sk->sk_priority; | |
757 | break; | |
758 | ||
759 | case SO_LINGER: | |
760 | lv = sizeof(v.ling); | |
761 | v.ling.l_onoff = !!sock_flag(sk, SOCK_LINGER); | |
762 | v.ling.l_linger = sk->sk_lingertime / HZ; | |
763 | break; | |
764 | ||
765 | case SO_BSDCOMPAT: | |
766 | sock_warn_obsolete_bsdism("getsockopt"); | |
767 | break; | |
768 | ||
769 | case SO_TIMESTAMP: | |
92f37fd2 ED |
770 | v.val = sock_flag(sk, SOCK_RCVTSTAMP) && |
771 | !sock_flag(sk, SOCK_RCVTSTAMPNS); | |
772 | break; | |
773 | ||
774 | case SO_TIMESTAMPNS: | |
775 | v.val = sock_flag(sk, SOCK_RCVTSTAMPNS); | |
e71a4783 SH |
776 | break; |
777 | ||
778 | case SO_RCVTIMEO: | |
779 | lv=sizeof(struct timeval); | |
780 | if (sk->sk_rcvtimeo == MAX_SCHEDULE_TIMEOUT) { | |
781 | v.tm.tv_sec = 0; | |
782 | v.tm.tv_usec = 0; | |
783 | } else { | |
784 | v.tm.tv_sec = sk->sk_rcvtimeo / HZ; | |
785 | v.tm.tv_usec = ((sk->sk_rcvtimeo % HZ) * 1000000) / HZ; | |
786 | } | |
787 | break; | |
788 | ||
789 | case SO_SNDTIMEO: | |
790 | lv=sizeof(struct timeval); | |
791 | if (sk->sk_sndtimeo == MAX_SCHEDULE_TIMEOUT) { | |
792 | v.tm.tv_sec = 0; | |
793 | v.tm.tv_usec = 0; | |
794 | } else { | |
795 | v.tm.tv_sec = sk->sk_sndtimeo / HZ; | |
796 | v.tm.tv_usec = ((sk->sk_sndtimeo % HZ) * 1000000) / HZ; | |
797 | } | |
798 | break; | |
1da177e4 | 799 | |
e71a4783 SH |
800 | case SO_RCVLOWAT: |
801 | v.val = sk->sk_rcvlowat; | |
802 | break; | |
1da177e4 | 803 | |
e71a4783 SH |
804 | case SO_SNDLOWAT: |
805 | v.val=1; | |
806 | break; | |
1da177e4 | 807 | |
e71a4783 SH |
808 | case SO_PASSCRED: |
809 | v.val = test_bit(SOCK_PASSCRED, &sock->flags) ? 1 : 0; | |
810 | break; | |
1da177e4 | 811 | |
e71a4783 SH |
812 | case SO_PEERCRED: |
813 | if (len > sizeof(sk->sk_peercred)) | |
814 | len = sizeof(sk->sk_peercred); | |
815 | if (copy_to_user(optval, &sk->sk_peercred, len)) | |
816 | return -EFAULT; | |
817 | goto lenout; | |
1da177e4 | 818 | |
e71a4783 SH |
819 | case SO_PEERNAME: |
820 | { | |
821 | char address[128]; | |
822 | ||
823 | if (sock->ops->getname(sock, (struct sockaddr *)address, &lv, 2)) | |
824 | return -ENOTCONN; | |
825 | if (lv < len) | |
826 | return -EINVAL; | |
827 | if (copy_to_user(optval, address, len)) | |
828 | return -EFAULT; | |
829 | goto lenout; | |
830 | } | |
1da177e4 | 831 | |
e71a4783 SH |
832 | /* Dubious BSD thing... Probably nobody even uses it, but |
833 | * the UNIX standard wants it for whatever reason... -DaveM | |
834 | */ | |
835 | case SO_ACCEPTCONN: | |
836 | v.val = sk->sk_state == TCP_LISTEN; | |
837 | break; | |
1da177e4 | 838 | |
e71a4783 SH |
839 | case SO_PASSSEC: |
840 | v.val = test_bit(SOCK_PASSSEC, &sock->flags) ? 1 : 0; | |
841 | break; | |
877ce7c1 | 842 | |
e71a4783 SH |
843 | case SO_PEERSEC: |
844 | return security_socket_getpeersec_stream(sock, optval, optlen, len); | |
1da177e4 | 845 | |
4a19ec58 LAT |
846 | case SO_MARK: |
847 | v.val = sk->sk_mark; | |
848 | break; | |
849 | ||
e71a4783 SH |
850 | default: |
851 | return -ENOPROTOOPT; | |
1da177e4 | 852 | } |
e71a4783 | 853 | |
1da177e4 LT |
854 | if (len > lv) |
855 | len = lv; | |
856 | if (copy_to_user(optval, &v, len)) | |
857 | return -EFAULT; | |
858 | lenout: | |
4ec93edb YH |
859 | if (put_user(len, optlen)) |
860 | return -EFAULT; | |
861 | return 0; | |
1da177e4 LT |
862 | } |
863 | ||
a5b5bb9a IM |
864 | /* |
865 | * Initialize an sk_lock. | |
866 | * | |
867 | * (We also register the sk_lock with the lock validator.) | |
868 | */ | |
b6f99a21 | 869 | static inline void sock_lock_init(struct sock *sk) |
a5b5bb9a | 870 | { |
ed07536e PZ |
871 | sock_lock_init_class_and_name(sk, |
872 | af_family_slock_key_strings[sk->sk_family], | |
873 | af_family_slock_keys + sk->sk_family, | |
874 | af_family_key_strings[sk->sk_family], | |
875 | af_family_keys + sk->sk_family); | |
a5b5bb9a IM |
876 | } |
877 | ||
f1a6c4da PE |
878 | static void sock_copy(struct sock *nsk, const struct sock *osk) |
879 | { | |
880 | #ifdef CONFIG_SECURITY_NETWORK | |
881 | void *sptr = nsk->sk_security; | |
882 | #endif | |
883 | ||
884 | memcpy(nsk, osk, osk->sk_prot->obj_size); | |
f1a6c4da PE |
885 | #ifdef CONFIG_SECURITY_NETWORK |
886 | nsk->sk_security = sptr; | |
887 | security_sk_clone(osk, nsk); | |
888 | #endif | |
889 | } | |
890 | ||
2e4afe7b PE |
891 | static struct sock *sk_prot_alloc(struct proto *prot, gfp_t priority, |
892 | int family) | |
c308c1b2 PE |
893 | { |
894 | struct sock *sk; | |
895 | struct kmem_cache *slab; | |
896 | ||
897 | slab = prot->slab; | |
898 | if (slab != NULL) | |
899 | sk = kmem_cache_alloc(slab, priority); | |
900 | else | |
901 | sk = kmalloc(prot->obj_size, priority); | |
902 | ||
2e4afe7b PE |
903 | if (sk != NULL) { |
904 | if (security_sk_alloc(sk, family, priority)) | |
905 | goto out_free; | |
906 | ||
907 | if (!try_module_get(prot->owner)) | |
908 | goto out_free_sec; | |
909 | } | |
910 | ||
c308c1b2 | 911 | return sk; |
2e4afe7b PE |
912 | |
913 | out_free_sec: | |
914 | security_sk_free(sk); | |
915 | out_free: | |
916 | if (slab != NULL) | |
917 | kmem_cache_free(slab, sk); | |
918 | else | |
919 | kfree(sk); | |
920 | return NULL; | |
c308c1b2 PE |
921 | } |
922 | ||
923 | static void sk_prot_free(struct proto *prot, struct sock *sk) | |
924 | { | |
925 | struct kmem_cache *slab; | |
2e4afe7b | 926 | struct module *owner; |
c308c1b2 | 927 | |
2e4afe7b | 928 | owner = prot->owner; |
c308c1b2 | 929 | slab = prot->slab; |
2e4afe7b PE |
930 | |
931 | security_sk_free(sk); | |
c308c1b2 PE |
932 | if (slab != NULL) |
933 | kmem_cache_free(slab, sk); | |
934 | else | |
935 | kfree(sk); | |
2e4afe7b | 936 | module_put(owner); |
c308c1b2 PE |
937 | } |
938 | ||
1da177e4 LT |
939 | /** |
940 | * sk_alloc - All socket objects are allocated here | |
c4ea43c5 | 941 | * @net: the applicable net namespace |
4dc3b16b PP |
942 | * @family: protocol family |
943 | * @priority: for allocation (%GFP_KERNEL, %GFP_ATOMIC, etc) | |
944 | * @prot: struct proto associated with this new sock instance | |
945 | * @zero_it: if we should zero the newly allocated sock | |
1da177e4 | 946 | */ |
1b8d7ae4 | 947 | struct sock *sk_alloc(struct net *net, int family, gfp_t priority, |
6257ff21 | 948 | struct proto *prot) |
1da177e4 | 949 | { |
c308c1b2 | 950 | struct sock *sk; |
1da177e4 | 951 | |
154adbc8 | 952 | sk = sk_prot_alloc(prot, priority | __GFP_ZERO, family); |
1da177e4 | 953 | if (sk) { |
154adbc8 PE |
954 | sk->sk_family = family; |
955 | /* | |
956 | * See comment in struct sock definition to understand | |
957 | * why we need sk_prot_creator -acme | |
958 | */ | |
959 | sk->sk_prot = sk->sk_prot_creator = prot; | |
960 | sock_lock_init(sk); | |
961 | sk->sk_net = get_net(net); | |
1da177e4 | 962 | } |
a79af59e | 963 | |
2e4afe7b | 964 | return sk; |
1da177e4 LT |
965 | } |
966 | ||
967 | void sk_free(struct sock *sk) | |
968 | { | |
969 | struct sk_filter *filter; | |
1da177e4 LT |
970 | |
971 | if (sk->sk_destruct) | |
972 | sk->sk_destruct(sk); | |
973 | ||
fda9ef5d | 974 | filter = rcu_dereference(sk->sk_filter); |
1da177e4 | 975 | if (filter) { |
309dd5fc | 976 | sk_filter_uncharge(sk, filter); |
fda9ef5d | 977 | rcu_assign_pointer(sk->sk_filter, NULL); |
1da177e4 LT |
978 | } |
979 | ||
980 | sock_disable_timestamp(sk); | |
981 | ||
982 | if (atomic_read(&sk->sk_omem_alloc)) | |
983 | printk(KERN_DEBUG "%s: optmem leakage (%d bytes) detected.\n", | |
984 | __FUNCTION__, atomic_read(&sk->sk_omem_alloc)); | |
985 | ||
1b8d7ae4 | 986 | put_net(sk->sk_net); |
c308c1b2 | 987 | sk_prot_free(sk->sk_prot_creator, sk); |
1da177e4 LT |
988 | } |
989 | ||
edf02087 DL |
990 | /* |
991 | * Last sock_put should drop referrence to sk->sk_net. It has already | |
992 | * been dropped in sk_change_net. Taking referrence to stopping namespace | |
993 | * is not an option. | |
994 | * Take referrence to a socket to remove it from hash _alive_ and after that | |
995 | * destroy it in the context of init_net. | |
996 | */ | |
997 | void sk_release_kernel(struct sock *sk) | |
998 | { | |
999 | if (sk == NULL || sk->sk_socket == NULL) | |
1000 | return; | |
1001 | ||
1002 | sock_hold(sk); | |
1003 | sock_release(sk->sk_socket); | |
1004 | sk->sk_net = get_net(&init_net); | |
1005 | sock_put(sk); | |
1006 | } | |
1007 | ||
dd0fc66f | 1008 | struct sock *sk_clone(const struct sock *sk, const gfp_t priority) |
87d11ceb | 1009 | { |
8fd1d178 | 1010 | struct sock *newsk; |
87d11ceb | 1011 | |
8fd1d178 | 1012 | newsk = sk_prot_alloc(sk->sk_prot, priority, sk->sk_family); |
87d11ceb ACM |
1013 | if (newsk != NULL) { |
1014 | struct sk_filter *filter; | |
1015 | ||
892c141e | 1016 | sock_copy(newsk, sk); |
87d11ceb ACM |
1017 | |
1018 | /* SANITY */ | |
1e2e6b89 | 1019 | get_net(newsk->sk_net); |
87d11ceb ACM |
1020 | sk_node_init(&newsk->sk_node); |
1021 | sock_lock_init(newsk); | |
1022 | bh_lock_sock(newsk); | |
fa438ccf | 1023 | newsk->sk_backlog.head = newsk->sk_backlog.tail = NULL; |
87d11ceb ACM |
1024 | |
1025 | atomic_set(&newsk->sk_rmem_alloc, 0); | |
1026 | atomic_set(&newsk->sk_wmem_alloc, 0); | |
1027 | atomic_set(&newsk->sk_omem_alloc, 0); | |
1028 | skb_queue_head_init(&newsk->sk_receive_queue); | |
1029 | skb_queue_head_init(&newsk->sk_write_queue); | |
97fc2f08 CL |
1030 | #ifdef CONFIG_NET_DMA |
1031 | skb_queue_head_init(&newsk->sk_async_wait_queue); | |
1032 | #endif | |
87d11ceb ACM |
1033 | |
1034 | rwlock_init(&newsk->sk_dst_lock); | |
1035 | rwlock_init(&newsk->sk_callback_lock); | |
443aef0e PZ |
1036 | lockdep_set_class_and_name(&newsk->sk_callback_lock, |
1037 | af_callback_keys + newsk->sk_family, | |
1038 | af_family_clock_key_strings[newsk->sk_family]); | |
87d11ceb ACM |
1039 | |
1040 | newsk->sk_dst_cache = NULL; | |
1041 | newsk->sk_wmem_queued = 0; | |
1042 | newsk->sk_forward_alloc = 0; | |
1043 | newsk->sk_send_head = NULL; | |
87d11ceb ACM |
1044 | newsk->sk_userlocks = sk->sk_userlocks & ~SOCK_BINDPORT_LOCK; |
1045 | ||
1046 | sock_reset_flag(newsk, SOCK_DONE); | |
1047 | skb_queue_head_init(&newsk->sk_error_queue); | |
1048 | ||
1049 | filter = newsk->sk_filter; | |
1050 | if (filter != NULL) | |
1051 | sk_filter_charge(newsk, filter); | |
1052 | ||
1053 | if (unlikely(xfrm_sk_clone_policy(newsk))) { | |
1054 | /* It is still raw copy of parent, so invalidate | |
1055 | * destructor and make plain sk_free() */ | |
1056 | newsk->sk_destruct = NULL; | |
1057 | sk_free(newsk); | |
1058 | newsk = NULL; | |
1059 | goto out; | |
1060 | } | |
1061 | ||
1062 | newsk->sk_err = 0; | |
1063 | newsk->sk_priority = 0; | |
1064 | atomic_set(&newsk->sk_refcnt, 2); | |
1065 | ||
1066 | /* | |
1067 | * Increment the counter in the same struct proto as the master | |
1068 | * sock (sk_refcnt_debug_inc uses newsk->sk_prot->socks, that | |
1069 | * is the same as sk->sk_prot->socks, as this field was copied | |
1070 | * with memcpy). | |
1071 | * | |
1072 | * This _changes_ the previous behaviour, where | |
1073 | * tcp_create_openreq_child always was incrementing the | |
1074 | * equivalent to tcp_prot->socks (inet_sock_nr), so this have | |
1075 | * to be taken into account in all callers. -acme | |
1076 | */ | |
1077 | sk_refcnt_debug_inc(newsk); | |
1078 | newsk->sk_socket = NULL; | |
1079 | newsk->sk_sleep = NULL; | |
1080 | ||
1081 | if (newsk->sk_prot->sockets_allocated) | |
1082 | atomic_inc(newsk->sk_prot->sockets_allocated); | |
1083 | } | |
1084 | out: | |
1085 | return newsk; | |
1086 | } | |
1087 | ||
1088 | EXPORT_SYMBOL_GPL(sk_clone); | |
1089 | ||
9958089a AK |
1090 | void sk_setup_caps(struct sock *sk, struct dst_entry *dst) |
1091 | { | |
1092 | __sk_dst_set(sk, dst); | |
1093 | sk->sk_route_caps = dst->dev->features; | |
1094 | if (sk->sk_route_caps & NETIF_F_GSO) | |
4fcd6b99 | 1095 | sk->sk_route_caps |= NETIF_F_GSO_SOFTWARE; |
9958089a AK |
1096 | if (sk_can_gso(sk)) { |
1097 | if (dst->header_len) | |
1098 | sk->sk_route_caps &= ~NETIF_F_GSO_MASK; | |
1099 | else | |
1100 | sk->sk_route_caps |= NETIF_F_SG | NETIF_F_HW_CSUM; | |
1101 | } | |
1102 | } | |
1103 | EXPORT_SYMBOL_GPL(sk_setup_caps); | |
1104 | ||
1da177e4 LT |
1105 | void __init sk_init(void) |
1106 | { | |
1107 | if (num_physpages <= 4096) { | |
1108 | sysctl_wmem_max = 32767; | |
1109 | sysctl_rmem_max = 32767; | |
1110 | sysctl_wmem_default = 32767; | |
1111 | sysctl_rmem_default = 32767; | |
1112 | } else if (num_physpages >= 131072) { | |
1113 | sysctl_wmem_max = 131071; | |
1114 | sysctl_rmem_max = 131071; | |
1115 | } | |
1116 | } | |
1117 | ||
1118 | /* | |
1119 | * Simple resource managers for sockets. | |
1120 | */ | |
1121 | ||
1122 | ||
4ec93edb YH |
1123 | /* |
1124 | * Write buffer destructor automatically called from kfree_skb. | |
1da177e4 LT |
1125 | */ |
1126 | void sock_wfree(struct sk_buff *skb) | |
1127 | { | |
1128 | struct sock *sk = skb->sk; | |
1129 | ||
1130 | /* In case it might be waiting for more memory. */ | |
1131 | atomic_sub(skb->truesize, &sk->sk_wmem_alloc); | |
1132 | if (!sock_flag(sk, SOCK_USE_WRITE_QUEUE)) | |
1133 | sk->sk_write_space(sk); | |
1134 | sock_put(sk); | |
1135 | } | |
1136 | ||
4ec93edb YH |
1137 | /* |
1138 | * Read buffer destructor automatically called from kfree_skb. | |
1da177e4 LT |
1139 | */ |
1140 | void sock_rfree(struct sk_buff *skb) | |
1141 | { | |
1142 | struct sock *sk = skb->sk; | |
1143 | ||
3ab224be | 1144 | skb_truesize_check(skb); |
1da177e4 | 1145 | atomic_sub(skb->truesize, &sk->sk_rmem_alloc); |
3ab224be | 1146 | sk_mem_uncharge(skb->sk, skb->truesize); |
1da177e4 LT |
1147 | } |
1148 | ||
1149 | ||
1150 | int sock_i_uid(struct sock *sk) | |
1151 | { | |
1152 | int uid; | |
1153 | ||
1154 | read_lock(&sk->sk_callback_lock); | |
1155 | uid = sk->sk_socket ? SOCK_INODE(sk->sk_socket)->i_uid : 0; | |
1156 | read_unlock(&sk->sk_callback_lock); | |
1157 | return uid; | |
1158 | } | |
1159 | ||
1160 | unsigned long sock_i_ino(struct sock *sk) | |
1161 | { | |
1162 | unsigned long ino; | |
1163 | ||
1164 | read_lock(&sk->sk_callback_lock); | |
1165 | ino = sk->sk_socket ? SOCK_INODE(sk->sk_socket)->i_ino : 0; | |
1166 | read_unlock(&sk->sk_callback_lock); | |
1167 | return ino; | |
1168 | } | |
1169 | ||
1170 | /* | |
1171 | * Allocate a skb from the socket's send buffer. | |
1172 | */ | |
86a76caf | 1173 | struct sk_buff *sock_wmalloc(struct sock *sk, unsigned long size, int force, |
dd0fc66f | 1174 | gfp_t priority) |
1da177e4 LT |
1175 | { |
1176 | if (force || atomic_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf) { | |
1177 | struct sk_buff * skb = alloc_skb(size, priority); | |
1178 | if (skb) { | |
1179 | skb_set_owner_w(skb, sk); | |
1180 | return skb; | |
1181 | } | |
1182 | } | |
1183 | return NULL; | |
1184 | } | |
1185 | ||
1186 | /* | |
1187 | * Allocate a skb from the socket's receive buffer. | |
4ec93edb | 1188 | */ |
86a76caf | 1189 | struct sk_buff *sock_rmalloc(struct sock *sk, unsigned long size, int force, |
dd0fc66f | 1190 | gfp_t priority) |
1da177e4 LT |
1191 | { |
1192 | if (force || atomic_read(&sk->sk_rmem_alloc) < sk->sk_rcvbuf) { | |
1193 | struct sk_buff *skb = alloc_skb(size, priority); | |
1194 | if (skb) { | |
1195 | skb_set_owner_r(skb, sk); | |
1196 | return skb; | |
1197 | } | |
1198 | } | |
1199 | return NULL; | |
1200 | } | |
1201 | ||
4ec93edb | 1202 | /* |
1da177e4 | 1203 | * Allocate a memory block from the socket's option memory buffer. |
4ec93edb | 1204 | */ |
dd0fc66f | 1205 | void *sock_kmalloc(struct sock *sk, int size, gfp_t priority) |
1da177e4 LT |
1206 | { |
1207 | if ((unsigned)size <= sysctl_optmem_max && | |
1208 | atomic_read(&sk->sk_omem_alloc) + size < sysctl_optmem_max) { | |
1209 | void *mem; | |
1210 | /* First do the add, to avoid the race if kmalloc | |
4ec93edb | 1211 | * might sleep. |
1da177e4 LT |
1212 | */ |
1213 | atomic_add(size, &sk->sk_omem_alloc); | |
1214 | mem = kmalloc(size, priority); | |
1215 | if (mem) | |
1216 | return mem; | |
1217 | atomic_sub(size, &sk->sk_omem_alloc); | |
1218 | } | |
1219 | return NULL; | |
1220 | } | |
1221 | ||
1222 | /* | |
1223 | * Free an option memory block. | |
1224 | */ | |
1225 | void sock_kfree_s(struct sock *sk, void *mem, int size) | |
1226 | { | |
1227 | kfree(mem); | |
1228 | atomic_sub(size, &sk->sk_omem_alloc); | |
1229 | } | |
1230 | ||
1231 | /* It is almost wait_for_tcp_memory minus release_sock/lock_sock. | |
1232 | I think, these locks should be removed for datagram sockets. | |
1233 | */ | |
1234 | static long sock_wait_for_wmem(struct sock * sk, long timeo) | |
1235 | { | |
1236 | DEFINE_WAIT(wait); | |
1237 | ||
1238 | clear_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags); | |
1239 | for (;;) { | |
1240 | if (!timeo) | |
1241 | break; | |
1242 | if (signal_pending(current)) | |
1243 | break; | |
1244 | set_bit(SOCK_NOSPACE, &sk->sk_socket->flags); | |
1245 | prepare_to_wait(sk->sk_sleep, &wait, TASK_INTERRUPTIBLE); | |
1246 | if (atomic_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf) | |
1247 | break; | |
1248 | if (sk->sk_shutdown & SEND_SHUTDOWN) | |
1249 | break; | |
1250 | if (sk->sk_err) | |
1251 | break; | |
1252 | timeo = schedule_timeout(timeo); | |
1253 | } | |
1254 | finish_wait(sk->sk_sleep, &wait); | |
1255 | return timeo; | |
1256 | } | |
1257 | ||
1258 | ||
1259 | /* | |
1260 | * Generic send/receive buffer handlers | |
1261 | */ | |
1262 | ||
1263 | static struct sk_buff *sock_alloc_send_pskb(struct sock *sk, | |
1264 | unsigned long header_len, | |
1265 | unsigned long data_len, | |
1266 | int noblock, int *errcode) | |
1267 | { | |
1268 | struct sk_buff *skb; | |
7d877f3b | 1269 | gfp_t gfp_mask; |
1da177e4 LT |
1270 | long timeo; |
1271 | int err; | |
1272 | ||
1273 | gfp_mask = sk->sk_allocation; | |
1274 | if (gfp_mask & __GFP_WAIT) | |
1275 | gfp_mask |= __GFP_REPEAT; | |
1276 | ||
1277 | timeo = sock_sndtimeo(sk, noblock); | |
1278 | while (1) { | |
1279 | err = sock_error(sk); | |
1280 | if (err != 0) | |
1281 | goto failure; | |
1282 | ||
1283 | err = -EPIPE; | |
1284 | if (sk->sk_shutdown & SEND_SHUTDOWN) | |
1285 | goto failure; | |
1286 | ||
1287 | if (atomic_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf) { | |
db38c179 | 1288 | skb = alloc_skb(header_len, gfp_mask); |
1da177e4 LT |
1289 | if (skb) { |
1290 | int npages; | |
1291 | int i; | |
1292 | ||
1293 | /* No pages, we're done... */ | |
1294 | if (!data_len) | |
1295 | break; | |
1296 | ||
1297 | npages = (data_len + (PAGE_SIZE - 1)) >> PAGE_SHIFT; | |
1298 | skb->truesize += data_len; | |
1299 | skb_shinfo(skb)->nr_frags = npages; | |
1300 | for (i = 0; i < npages; i++) { | |
1301 | struct page *page; | |
1302 | skb_frag_t *frag; | |
1303 | ||
1304 | page = alloc_pages(sk->sk_allocation, 0); | |
1305 | if (!page) { | |
1306 | err = -ENOBUFS; | |
1307 | skb_shinfo(skb)->nr_frags = i; | |
1308 | kfree_skb(skb); | |
1309 | goto failure; | |
1310 | } | |
1311 | ||
1312 | frag = &skb_shinfo(skb)->frags[i]; | |
1313 | frag->page = page; | |
1314 | frag->page_offset = 0; | |
1315 | frag->size = (data_len >= PAGE_SIZE ? | |
1316 | PAGE_SIZE : | |
1317 | data_len); | |
1318 | data_len -= PAGE_SIZE; | |
1319 | } | |
1320 | ||
1321 | /* Full success... */ | |
1322 | break; | |
1323 | } | |
1324 | err = -ENOBUFS; | |
1325 | goto failure; | |
1326 | } | |
1327 | set_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags); | |
1328 | set_bit(SOCK_NOSPACE, &sk->sk_socket->flags); | |
1329 | err = -EAGAIN; | |
1330 | if (!timeo) | |
1331 | goto failure; | |
1332 | if (signal_pending(current)) | |
1333 | goto interrupted; | |
1334 | timeo = sock_wait_for_wmem(sk, timeo); | |
1335 | } | |
1336 | ||
1337 | skb_set_owner_w(skb, sk); | |
1338 | return skb; | |
1339 | ||
1340 | interrupted: | |
1341 | err = sock_intr_errno(timeo); | |
1342 | failure: | |
1343 | *errcode = err; | |
1344 | return NULL; | |
1345 | } | |
1346 | ||
4ec93edb | 1347 | struct sk_buff *sock_alloc_send_skb(struct sock *sk, unsigned long size, |
1da177e4 LT |
1348 | int noblock, int *errcode) |
1349 | { | |
1350 | return sock_alloc_send_pskb(sk, size, 0, noblock, errcode); | |
1351 | } | |
1352 | ||
1353 | static void __lock_sock(struct sock *sk) | |
1354 | { | |
1355 | DEFINE_WAIT(wait); | |
1356 | ||
e71a4783 | 1357 | for (;;) { |
1da177e4 LT |
1358 | prepare_to_wait_exclusive(&sk->sk_lock.wq, &wait, |
1359 | TASK_UNINTERRUPTIBLE); | |
1360 | spin_unlock_bh(&sk->sk_lock.slock); | |
1361 | schedule(); | |
1362 | spin_lock_bh(&sk->sk_lock.slock); | |
e71a4783 | 1363 | if (!sock_owned_by_user(sk)) |
1da177e4 LT |
1364 | break; |
1365 | } | |
1366 | finish_wait(&sk->sk_lock.wq, &wait); | |
1367 | } | |
1368 | ||
1369 | static void __release_sock(struct sock *sk) | |
1370 | { | |
1371 | struct sk_buff *skb = sk->sk_backlog.head; | |
1372 | ||
1373 | do { | |
1374 | sk->sk_backlog.head = sk->sk_backlog.tail = NULL; | |
1375 | bh_unlock_sock(sk); | |
1376 | ||
1377 | do { | |
1378 | struct sk_buff *next = skb->next; | |
1379 | ||
1380 | skb->next = NULL; | |
1381 | sk->sk_backlog_rcv(sk, skb); | |
1382 | ||
1383 | /* | |
1384 | * We are in process context here with softirqs | |
1385 | * disabled, use cond_resched_softirq() to preempt. | |
1386 | * This is safe to do because we've taken the backlog | |
1387 | * queue private: | |
1388 | */ | |
1389 | cond_resched_softirq(); | |
1390 | ||
1391 | skb = next; | |
1392 | } while (skb != NULL); | |
1393 | ||
1394 | bh_lock_sock(sk); | |
e71a4783 | 1395 | } while ((skb = sk->sk_backlog.head) != NULL); |
1da177e4 LT |
1396 | } |
1397 | ||
1398 | /** | |
1399 | * sk_wait_data - wait for data to arrive at sk_receive_queue | |
4dc3b16b PP |
1400 | * @sk: sock to wait on |
1401 | * @timeo: for how long | |
1da177e4 LT |
1402 | * |
1403 | * Now socket state including sk->sk_err is changed only under lock, | |
1404 | * hence we may omit checks after joining wait queue. | |
1405 | * We check receive queue before schedule() only as optimization; | |
1406 | * it is very likely that release_sock() added new data. | |
1407 | */ | |
1408 | int sk_wait_data(struct sock *sk, long *timeo) | |
1409 | { | |
1410 | int rc; | |
1411 | DEFINE_WAIT(wait); | |
1412 | ||
1413 | prepare_to_wait(sk->sk_sleep, &wait, TASK_INTERRUPTIBLE); | |
1414 | set_bit(SOCK_ASYNC_WAITDATA, &sk->sk_socket->flags); | |
1415 | rc = sk_wait_event(sk, timeo, !skb_queue_empty(&sk->sk_receive_queue)); | |
1416 | clear_bit(SOCK_ASYNC_WAITDATA, &sk->sk_socket->flags); | |
1417 | finish_wait(sk->sk_sleep, &wait); | |
1418 | return rc; | |
1419 | } | |
1420 | ||
1421 | EXPORT_SYMBOL(sk_wait_data); | |
1422 | ||
3ab224be HA |
1423 | /** |
1424 | * __sk_mem_schedule - increase sk_forward_alloc and memory_allocated | |
1425 | * @sk: socket | |
1426 | * @size: memory size to allocate | |
1427 | * @kind: allocation type | |
1428 | * | |
1429 | * If kind is SK_MEM_SEND, it means wmem allocation. Otherwise it means | |
1430 | * rmem allocation. This function assumes that protocols which have | |
1431 | * memory_pressure use sk_wmem_queued as write buffer accounting. | |
1432 | */ | |
1433 | int __sk_mem_schedule(struct sock *sk, int size, int kind) | |
1434 | { | |
1435 | struct proto *prot = sk->sk_prot; | |
1436 | int amt = sk_mem_pages(size); | |
1437 | int allocated; | |
1438 | ||
1439 | sk->sk_forward_alloc += amt * SK_MEM_QUANTUM; | |
1440 | allocated = atomic_add_return(amt, prot->memory_allocated); | |
1441 | ||
1442 | /* Under limit. */ | |
1443 | if (allocated <= prot->sysctl_mem[0]) { | |
1444 | if (prot->memory_pressure && *prot->memory_pressure) | |
1445 | *prot->memory_pressure = 0; | |
1446 | return 1; | |
1447 | } | |
1448 | ||
1449 | /* Under pressure. */ | |
1450 | if (allocated > prot->sysctl_mem[1]) | |
1451 | if (prot->enter_memory_pressure) | |
1452 | prot->enter_memory_pressure(); | |
1453 | ||
1454 | /* Over hard limit. */ | |
1455 | if (allocated > prot->sysctl_mem[2]) | |
1456 | goto suppress_allocation; | |
1457 | ||
1458 | /* guarantee minimum buffer size under pressure */ | |
1459 | if (kind == SK_MEM_RECV) { | |
1460 | if (atomic_read(&sk->sk_rmem_alloc) < prot->sysctl_rmem[0]) | |
1461 | return 1; | |
1462 | } else { /* SK_MEM_SEND */ | |
1463 | if (sk->sk_type == SOCK_STREAM) { | |
1464 | if (sk->sk_wmem_queued < prot->sysctl_wmem[0]) | |
1465 | return 1; | |
1466 | } else if (atomic_read(&sk->sk_wmem_alloc) < | |
1467 | prot->sysctl_wmem[0]) | |
1468 | return 1; | |
1469 | } | |
1470 | ||
1471 | if (prot->memory_pressure) { | |
1472 | if (!*prot->memory_pressure || | |
1473 | prot->sysctl_mem[2] > atomic_read(prot->sockets_allocated) * | |
1474 | sk_mem_pages(sk->sk_wmem_queued + | |
1475 | atomic_read(&sk->sk_rmem_alloc) + | |
1476 | sk->sk_forward_alloc)) | |
1477 | return 1; | |
1478 | } | |
1479 | ||
1480 | suppress_allocation: | |
1481 | ||
1482 | if (kind == SK_MEM_SEND && sk->sk_type == SOCK_STREAM) { | |
1483 | sk_stream_moderate_sndbuf(sk); | |
1484 | ||
1485 | /* Fail only if socket is _under_ its sndbuf. | |
1486 | * In this case we cannot block, so that we have to fail. | |
1487 | */ | |
1488 | if (sk->sk_wmem_queued + size >= sk->sk_sndbuf) | |
1489 | return 1; | |
1490 | } | |
1491 | ||
1492 | /* Alas. Undo changes. */ | |
1493 | sk->sk_forward_alloc -= amt * SK_MEM_QUANTUM; | |
1494 | atomic_sub(amt, prot->memory_allocated); | |
1495 | return 0; | |
1496 | } | |
1497 | ||
1498 | EXPORT_SYMBOL(__sk_mem_schedule); | |
1499 | ||
1500 | /** | |
1501 | * __sk_reclaim - reclaim memory_allocated | |
1502 | * @sk: socket | |
1503 | */ | |
1504 | void __sk_mem_reclaim(struct sock *sk) | |
1505 | { | |
1506 | struct proto *prot = sk->sk_prot; | |
1507 | ||
680a5a50 | 1508 | atomic_sub(sk->sk_forward_alloc >> SK_MEM_QUANTUM_SHIFT, |
3ab224be HA |
1509 | prot->memory_allocated); |
1510 | sk->sk_forward_alloc &= SK_MEM_QUANTUM - 1; | |
1511 | ||
1512 | if (prot->memory_pressure && *prot->memory_pressure && | |
1513 | (atomic_read(prot->memory_allocated) < prot->sysctl_mem[0])) | |
1514 | *prot->memory_pressure = 0; | |
1515 | } | |
1516 | ||
1517 | EXPORT_SYMBOL(__sk_mem_reclaim); | |
1518 | ||
1519 | ||
1da177e4 LT |
1520 | /* |
1521 | * Set of default routines for initialising struct proto_ops when | |
1522 | * the protocol does not support a particular function. In certain | |
1523 | * cases where it makes no sense for a protocol to have a "do nothing" | |
1524 | * function, some default processing is provided. | |
1525 | */ | |
1526 | ||
1527 | int sock_no_bind(struct socket *sock, struct sockaddr *saddr, int len) | |
1528 | { | |
1529 | return -EOPNOTSUPP; | |
1530 | } | |
1531 | ||
4ec93edb | 1532 | int sock_no_connect(struct socket *sock, struct sockaddr *saddr, |
1da177e4 LT |
1533 | int len, int flags) |
1534 | { | |
1535 | return -EOPNOTSUPP; | |
1536 | } | |
1537 | ||
1538 | int sock_no_socketpair(struct socket *sock1, struct socket *sock2) | |
1539 | { | |
1540 | return -EOPNOTSUPP; | |
1541 | } | |
1542 | ||
1543 | int sock_no_accept(struct socket *sock, struct socket *newsock, int flags) | |
1544 | { | |
1545 | return -EOPNOTSUPP; | |
1546 | } | |
1547 | ||
4ec93edb | 1548 | int sock_no_getname(struct socket *sock, struct sockaddr *saddr, |
1da177e4 LT |
1549 | int *len, int peer) |
1550 | { | |
1551 | return -EOPNOTSUPP; | |
1552 | } | |
1553 | ||
1554 | unsigned int sock_no_poll(struct file * file, struct socket *sock, poll_table *pt) | |
1555 | { | |
1556 | return 0; | |
1557 | } | |
1558 | ||
1559 | int sock_no_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg) | |
1560 | { | |
1561 | return -EOPNOTSUPP; | |
1562 | } | |
1563 | ||
1564 | int sock_no_listen(struct socket *sock, int backlog) | |
1565 | { | |
1566 | return -EOPNOTSUPP; | |
1567 | } | |
1568 | ||
1569 | int sock_no_shutdown(struct socket *sock, int how) | |
1570 | { | |
1571 | return -EOPNOTSUPP; | |
1572 | } | |
1573 | ||
1574 | int sock_no_setsockopt(struct socket *sock, int level, int optname, | |
1575 | char __user *optval, int optlen) | |
1576 | { | |
1577 | return -EOPNOTSUPP; | |
1578 | } | |
1579 | ||
1580 | int sock_no_getsockopt(struct socket *sock, int level, int optname, | |
1581 | char __user *optval, int __user *optlen) | |
1582 | { | |
1583 | return -EOPNOTSUPP; | |
1584 | } | |
1585 | ||
1586 | int sock_no_sendmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *m, | |
1587 | size_t len) | |
1588 | { | |
1589 | return -EOPNOTSUPP; | |
1590 | } | |
1591 | ||
1592 | int sock_no_recvmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *m, | |
1593 | size_t len, int flags) | |
1594 | { | |
1595 | return -EOPNOTSUPP; | |
1596 | } | |
1597 | ||
1598 | int sock_no_mmap(struct file *file, struct socket *sock, struct vm_area_struct *vma) | |
1599 | { | |
1600 | /* Mirror missing mmap method error code */ | |
1601 | return -ENODEV; | |
1602 | } | |
1603 | ||
1604 | ssize_t sock_no_sendpage(struct socket *sock, struct page *page, int offset, size_t size, int flags) | |
1605 | { | |
1606 | ssize_t res; | |
1607 | struct msghdr msg = {.msg_flags = flags}; | |
1608 | struct kvec iov; | |
1609 | char *kaddr = kmap(page); | |
1610 | iov.iov_base = kaddr + offset; | |
1611 | iov.iov_len = size; | |
1612 | res = kernel_sendmsg(sock, &msg, &iov, 1, size); | |
1613 | kunmap(page); | |
1614 | return res; | |
1615 | } | |
1616 | ||
1617 | /* | |
1618 | * Default Socket Callbacks | |
1619 | */ | |
1620 | ||
1621 | static void sock_def_wakeup(struct sock *sk) | |
1622 | { | |
1623 | read_lock(&sk->sk_callback_lock); | |
1624 | if (sk->sk_sleep && waitqueue_active(sk->sk_sleep)) | |
1625 | wake_up_interruptible_all(sk->sk_sleep); | |
1626 | read_unlock(&sk->sk_callback_lock); | |
1627 | } | |
1628 | ||
1629 | static void sock_def_error_report(struct sock *sk) | |
1630 | { | |
1631 | read_lock(&sk->sk_callback_lock); | |
1632 | if (sk->sk_sleep && waitqueue_active(sk->sk_sleep)) | |
1633 | wake_up_interruptible(sk->sk_sleep); | |
8d8ad9d7 | 1634 | sk_wake_async(sk, SOCK_WAKE_IO, POLL_ERR); |
1da177e4 LT |
1635 | read_unlock(&sk->sk_callback_lock); |
1636 | } | |
1637 | ||
1638 | static void sock_def_readable(struct sock *sk, int len) | |
1639 | { | |
1640 | read_lock(&sk->sk_callback_lock); | |
1641 | if (sk->sk_sleep && waitqueue_active(sk->sk_sleep)) | |
1642 | wake_up_interruptible(sk->sk_sleep); | |
8d8ad9d7 | 1643 | sk_wake_async(sk, SOCK_WAKE_WAITD, POLL_IN); |
1da177e4 LT |
1644 | read_unlock(&sk->sk_callback_lock); |
1645 | } | |
1646 | ||
1647 | static void sock_def_write_space(struct sock *sk) | |
1648 | { | |
1649 | read_lock(&sk->sk_callback_lock); | |
1650 | ||
1651 | /* Do not wake up a writer until he can make "significant" | |
1652 | * progress. --DaveM | |
1653 | */ | |
e71a4783 | 1654 | if ((atomic_read(&sk->sk_wmem_alloc) << 1) <= sk->sk_sndbuf) { |
1da177e4 LT |
1655 | if (sk->sk_sleep && waitqueue_active(sk->sk_sleep)) |
1656 | wake_up_interruptible(sk->sk_sleep); | |
1657 | ||
1658 | /* Should agree with poll, otherwise some programs break */ | |
1659 | if (sock_writeable(sk)) | |
8d8ad9d7 | 1660 | sk_wake_async(sk, SOCK_WAKE_SPACE, POLL_OUT); |
1da177e4 LT |
1661 | } |
1662 | ||
1663 | read_unlock(&sk->sk_callback_lock); | |
1664 | } | |
1665 | ||
1666 | static void sock_def_destruct(struct sock *sk) | |
1667 | { | |
a51482bd | 1668 | kfree(sk->sk_protinfo); |
1da177e4 LT |
1669 | } |
1670 | ||
1671 | void sk_send_sigurg(struct sock *sk) | |
1672 | { | |
1673 | if (sk->sk_socket && sk->sk_socket->file) | |
1674 | if (send_sigurg(&sk->sk_socket->file->f_owner)) | |
8d8ad9d7 | 1675 | sk_wake_async(sk, SOCK_WAKE_URG, POLL_PRI); |
1da177e4 LT |
1676 | } |
1677 | ||
1678 | void sk_reset_timer(struct sock *sk, struct timer_list* timer, | |
1679 | unsigned long expires) | |
1680 | { | |
1681 | if (!mod_timer(timer, expires)) | |
1682 | sock_hold(sk); | |
1683 | } | |
1684 | ||
1685 | EXPORT_SYMBOL(sk_reset_timer); | |
1686 | ||
1687 | void sk_stop_timer(struct sock *sk, struct timer_list* timer) | |
1688 | { | |
1689 | if (timer_pending(timer) && del_timer(timer)) | |
1690 | __sock_put(sk); | |
1691 | } | |
1692 | ||
1693 | EXPORT_SYMBOL(sk_stop_timer); | |
1694 | ||
1695 | void sock_init_data(struct socket *sock, struct sock *sk) | |
1696 | { | |
1697 | skb_queue_head_init(&sk->sk_receive_queue); | |
1698 | skb_queue_head_init(&sk->sk_write_queue); | |
1699 | skb_queue_head_init(&sk->sk_error_queue); | |
97fc2f08 CL |
1700 | #ifdef CONFIG_NET_DMA |
1701 | skb_queue_head_init(&sk->sk_async_wait_queue); | |
1702 | #endif | |
1da177e4 LT |
1703 | |
1704 | sk->sk_send_head = NULL; | |
1705 | ||
1706 | init_timer(&sk->sk_timer); | |
4ec93edb | 1707 | |
1da177e4 LT |
1708 | sk->sk_allocation = GFP_KERNEL; |
1709 | sk->sk_rcvbuf = sysctl_rmem_default; | |
1710 | sk->sk_sndbuf = sysctl_wmem_default; | |
1711 | sk->sk_state = TCP_CLOSE; | |
1712 | sk->sk_socket = sock; | |
1713 | ||
1714 | sock_set_flag(sk, SOCK_ZAPPED); | |
1715 | ||
e71a4783 | 1716 | if (sock) { |
1da177e4 LT |
1717 | sk->sk_type = sock->type; |
1718 | sk->sk_sleep = &sock->wait; | |
1719 | sock->sk = sk; | |
1720 | } else | |
1721 | sk->sk_sleep = NULL; | |
1722 | ||
1723 | rwlock_init(&sk->sk_dst_lock); | |
1724 | rwlock_init(&sk->sk_callback_lock); | |
443aef0e PZ |
1725 | lockdep_set_class_and_name(&sk->sk_callback_lock, |
1726 | af_callback_keys + sk->sk_family, | |
1727 | af_family_clock_key_strings[sk->sk_family]); | |
1da177e4 LT |
1728 | |
1729 | sk->sk_state_change = sock_def_wakeup; | |
1730 | sk->sk_data_ready = sock_def_readable; | |
1731 | sk->sk_write_space = sock_def_write_space; | |
1732 | sk->sk_error_report = sock_def_error_report; | |
1733 | sk->sk_destruct = sock_def_destruct; | |
1734 | ||
1735 | sk->sk_sndmsg_page = NULL; | |
1736 | sk->sk_sndmsg_off = 0; | |
1737 | ||
1738 | sk->sk_peercred.pid = 0; | |
1739 | sk->sk_peercred.uid = -1; | |
1740 | sk->sk_peercred.gid = -1; | |
1741 | sk->sk_write_pending = 0; | |
1742 | sk->sk_rcvlowat = 1; | |
1743 | sk->sk_rcvtimeo = MAX_SCHEDULE_TIMEOUT; | |
1744 | sk->sk_sndtimeo = MAX_SCHEDULE_TIMEOUT; | |
1745 | ||
b7aa0bf7 | 1746 | sk->sk_stamp = ktime_set(-1L, -1L); |
1da177e4 LT |
1747 | |
1748 | atomic_set(&sk->sk_refcnt, 1); | |
33c732c3 | 1749 | atomic_set(&sk->sk_drops, 0); |
1da177e4 LT |
1750 | } |
1751 | ||
b5606c2d | 1752 | void lock_sock_nested(struct sock *sk, int subclass) |
1da177e4 LT |
1753 | { |
1754 | might_sleep(); | |
a5b5bb9a | 1755 | spin_lock_bh(&sk->sk_lock.slock); |
d2e9117c | 1756 | if (sk->sk_lock.owned) |
1da177e4 | 1757 | __lock_sock(sk); |
d2e9117c | 1758 | sk->sk_lock.owned = 1; |
a5b5bb9a IM |
1759 | spin_unlock(&sk->sk_lock.slock); |
1760 | /* | |
1761 | * The sk_lock has mutex_lock() semantics here: | |
1762 | */ | |
fcc70d5f | 1763 | mutex_acquire(&sk->sk_lock.dep_map, subclass, 0, _RET_IP_); |
a5b5bb9a | 1764 | local_bh_enable(); |
1da177e4 LT |
1765 | } |
1766 | ||
fcc70d5f | 1767 | EXPORT_SYMBOL(lock_sock_nested); |
1da177e4 | 1768 | |
b5606c2d | 1769 | void release_sock(struct sock *sk) |
1da177e4 | 1770 | { |
a5b5bb9a IM |
1771 | /* |
1772 | * The sk_lock has mutex_unlock() semantics: | |
1773 | */ | |
1774 | mutex_release(&sk->sk_lock.dep_map, 1, _RET_IP_); | |
1775 | ||
1776 | spin_lock_bh(&sk->sk_lock.slock); | |
1da177e4 LT |
1777 | if (sk->sk_backlog.tail) |
1778 | __release_sock(sk); | |
d2e9117c | 1779 | sk->sk_lock.owned = 0; |
a5b5bb9a IM |
1780 | if (waitqueue_active(&sk->sk_lock.wq)) |
1781 | wake_up(&sk->sk_lock.wq); | |
1782 | spin_unlock_bh(&sk->sk_lock.slock); | |
1da177e4 LT |
1783 | } |
1784 | EXPORT_SYMBOL(release_sock); | |
1785 | ||
1786 | int sock_get_timestamp(struct sock *sk, struct timeval __user *userstamp) | |
4ec93edb | 1787 | { |
b7aa0bf7 | 1788 | struct timeval tv; |
1da177e4 LT |
1789 | if (!sock_flag(sk, SOCK_TIMESTAMP)) |
1790 | sock_enable_timestamp(sk); | |
b7aa0bf7 ED |
1791 | tv = ktime_to_timeval(sk->sk_stamp); |
1792 | if (tv.tv_sec == -1) | |
1da177e4 | 1793 | return -ENOENT; |
b7aa0bf7 ED |
1794 | if (tv.tv_sec == 0) { |
1795 | sk->sk_stamp = ktime_get_real(); | |
1796 | tv = ktime_to_timeval(sk->sk_stamp); | |
1797 | } | |
1798 | return copy_to_user(userstamp, &tv, sizeof(tv)) ? -EFAULT : 0; | |
4ec93edb | 1799 | } |
1da177e4 LT |
1800 | EXPORT_SYMBOL(sock_get_timestamp); |
1801 | ||
ae40eb1e ED |
1802 | int sock_get_timestampns(struct sock *sk, struct timespec __user *userstamp) |
1803 | { | |
1804 | struct timespec ts; | |
1805 | if (!sock_flag(sk, SOCK_TIMESTAMP)) | |
1806 | sock_enable_timestamp(sk); | |
1807 | ts = ktime_to_timespec(sk->sk_stamp); | |
1808 | if (ts.tv_sec == -1) | |
1809 | return -ENOENT; | |
1810 | if (ts.tv_sec == 0) { | |
1811 | sk->sk_stamp = ktime_get_real(); | |
1812 | ts = ktime_to_timespec(sk->sk_stamp); | |
1813 | } | |
1814 | return copy_to_user(userstamp, &ts, sizeof(ts)) ? -EFAULT : 0; | |
1815 | } | |
1816 | EXPORT_SYMBOL(sock_get_timestampns); | |
1817 | ||
1da177e4 | 1818 | void sock_enable_timestamp(struct sock *sk) |
4ec93edb YH |
1819 | { |
1820 | if (!sock_flag(sk, SOCK_TIMESTAMP)) { | |
1da177e4 LT |
1821 | sock_set_flag(sk, SOCK_TIMESTAMP); |
1822 | net_enable_timestamp(); | |
1823 | } | |
1824 | } | |
1da177e4 LT |
1825 | |
1826 | /* | |
1827 | * Get a socket option on an socket. | |
1828 | * | |
1829 | * FIX: POSIX 1003.1g is very ambiguous here. It states that | |
1830 | * asynchronous errors should be reported by getsockopt. We assume | |
1831 | * this means if you specify SO_ERROR (otherwise whats the point of it). | |
1832 | */ | |
1833 | int sock_common_getsockopt(struct socket *sock, int level, int optname, | |
1834 | char __user *optval, int __user *optlen) | |
1835 | { | |
1836 | struct sock *sk = sock->sk; | |
1837 | ||
1838 | return sk->sk_prot->getsockopt(sk, level, optname, optval, optlen); | |
1839 | } | |
1840 | ||
1841 | EXPORT_SYMBOL(sock_common_getsockopt); | |
1842 | ||
3fdadf7d | 1843 | #ifdef CONFIG_COMPAT |
543d9cfe ACM |
1844 | int compat_sock_common_getsockopt(struct socket *sock, int level, int optname, |
1845 | char __user *optval, int __user *optlen) | |
3fdadf7d DM |
1846 | { |
1847 | struct sock *sk = sock->sk; | |
1848 | ||
1e51f951 | 1849 | if (sk->sk_prot->compat_getsockopt != NULL) |
543d9cfe ACM |
1850 | return sk->sk_prot->compat_getsockopt(sk, level, optname, |
1851 | optval, optlen); | |
3fdadf7d DM |
1852 | return sk->sk_prot->getsockopt(sk, level, optname, optval, optlen); |
1853 | } | |
1854 | EXPORT_SYMBOL(compat_sock_common_getsockopt); | |
1855 | #endif | |
1856 | ||
1da177e4 LT |
1857 | int sock_common_recvmsg(struct kiocb *iocb, struct socket *sock, |
1858 | struct msghdr *msg, size_t size, int flags) | |
1859 | { | |
1860 | struct sock *sk = sock->sk; | |
1861 | int addr_len = 0; | |
1862 | int err; | |
1863 | ||
1864 | err = sk->sk_prot->recvmsg(iocb, sk, msg, size, flags & MSG_DONTWAIT, | |
1865 | flags & ~MSG_DONTWAIT, &addr_len); | |
1866 | if (err >= 0) | |
1867 | msg->msg_namelen = addr_len; | |
1868 | return err; | |
1869 | } | |
1870 | ||
1871 | EXPORT_SYMBOL(sock_common_recvmsg); | |
1872 | ||
1873 | /* | |
1874 | * Set socket options on an inet socket. | |
1875 | */ | |
1876 | int sock_common_setsockopt(struct socket *sock, int level, int optname, | |
1877 | char __user *optval, int optlen) | |
1878 | { | |
1879 | struct sock *sk = sock->sk; | |
1880 | ||
1881 | return sk->sk_prot->setsockopt(sk, level, optname, optval, optlen); | |
1882 | } | |
1883 | ||
1884 | EXPORT_SYMBOL(sock_common_setsockopt); | |
1885 | ||
3fdadf7d | 1886 | #ifdef CONFIG_COMPAT |
543d9cfe ACM |
1887 | int compat_sock_common_setsockopt(struct socket *sock, int level, int optname, |
1888 | char __user *optval, int optlen) | |
3fdadf7d DM |
1889 | { |
1890 | struct sock *sk = sock->sk; | |
1891 | ||
543d9cfe ACM |
1892 | if (sk->sk_prot->compat_setsockopt != NULL) |
1893 | return sk->sk_prot->compat_setsockopt(sk, level, optname, | |
1894 | optval, optlen); | |
3fdadf7d DM |
1895 | return sk->sk_prot->setsockopt(sk, level, optname, optval, optlen); |
1896 | } | |
1897 | EXPORT_SYMBOL(compat_sock_common_setsockopt); | |
1898 | #endif | |
1899 | ||
1da177e4 LT |
1900 | void sk_common_release(struct sock *sk) |
1901 | { | |
1902 | if (sk->sk_prot->destroy) | |
1903 | sk->sk_prot->destroy(sk); | |
1904 | ||
1905 | /* | |
1906 | * Observation: when sock_common_release is called, processes have | |
1907 | * no access to socket. But net still has. | |
1908 | * Step one, detach it from networking: | |
1909 | * | |
1910 | * A. Remove from hash tables. | |
1911 | */ | |
1912 | ||
1913 | sk->sk_prot->unhash(sk); | |
1914 | ||
1915 | /* | |
1916 | * In this point socket cannot receive new packets, but it is possible | |
1917 | * that some packets are in flight because some CPU runs receiver and | |
1918 | * did hash table lookup before we unhashed socket. They will achieve | |
1919 | * receive queue and will be purged by socket destructor. | |
1920 | * | |
1921 | * Also we still have packets pending on receive queue and probably, | |
1922 | * our own packets waiting in device queues. sock_destroy will drain | |
1923 | * receive queue, but transmitted packets will delay socket destruction | |
1924 | * until the last reference will be released. | |
1925 | */ | |
1926 | ||
1927 | sock_orphan(sk); | |
1928 | ||
1929 | xfrm_sk_free_policy(sk); | |
1930 | ||
e6848976 | 1931 | sk_refcnt_debug_release(sk); |
1da177e4 LT |
1932 | sock_put(sk); |
1933 | } | |
1934 | ||
1935 | EXPORT_SYMBOL(sk_common_release); | |
1936 | ||
1937 | static DEFINE_RWLOCK(proto_list_lock); | |
1938 | static LIST_HEAD(proto_list); | |
1939 | ||
b733c007 PE |
1940 | int proto_register(struct proto *prot, int alloc_slab) |
1941 | { | |
1942 | char *request_sock_slab_name = NULL; | |
1943 | char *timewait_sock_slab_name; | |
1944 | ||
65f76517 | 1945 | if (sock_prot_inuse_init(prot) != 0) { |
ebb53d75 | 1946 | printk(KERN_CRIT "%s: Can't alloc inuse counters!\n", prot->name); |
b733c007 | 1947 | goto out; |
ebb53d75 | 1948 | } |
b733c007 | 1949 | |
1da177e4 LT |
1950 | if (alloc_slab) { |
1951 | prot->slab = kmem_cache_create(prot->name, prot->obj_size, 0, | |
20c2df83 | 1952 | SLAB_HWCACHE_ALIGN, NULL); |
1da177e4 LT |
1953 | |
1954 | if (prot->slab == NULL) { | |
1955 | printk(KERN_CRIT "%s: Can't create sock SLAB cache!\n", | |
1956 | prot->name); | |
286ab3d4 | 1957 | goto out_free_inuse; |
1da177e4 | 1958 | } |
2e6599cb ACM |
1959 | |
1960 | if (prot->rsk_prot != NULL) { | |
1961 | static const char mask[] = "request_sock_%s"; | |
1962 | ||
1963 | request_sock_slab_name = kmalloc(strlen(prot->name) + sizeof(mask) - 1, GFP_KERNEL); | |
1964 | if (request_sock_slab_name == NULL) | |
1965 | goto out_free_sock_slab; | |
1966 | ||
1967 | sprintf(request_sock_slab_name, mask, prot->name); | |
1968 | prot->rsk_prot->slab = kmem_cache_create(request_sock_slab_name, | |
1969 | prot->rsk_prot->obj_size, 0, | |
20c2df83 | 1970 | SLAB_HWCACHE_ALIGN, NULL); |
2e6599cb ACM |
1971 | |
1972 | if (prot->rsk_prot->slab == NULL) { | |
1973 | printk(KERN_CRIT "%s: Can't create request sock SLAB cache!\n", | |
1974 | prot->name); | |
1975 | goto out_free_request_sock_slab_name; | |
1976 | } | |
1977 | } | |
8feaf0c0 | 1978 | |
6d6ee43e | 1979 | if (prot->twsk_prot != NULL) { |
8feaf0c0 ACM |
1980 | static const char mask[] = "tw_sock_%s"; |
1981 | ||
1982 | timewait_sock_slab_name = kmalloc(strlen(prot->name) + sizeof(mask) - 1, GFP_KERNEL); | |
1983 | ||
1984 | if (timewait_sock_slab_name == NULL) | |
1985 | goto out_free_request_sock_slab; | |
1986 | ||
1987 | sprintf(timewait_sock_slab_name, mask, prot->name); | |
6d6ee43e ACM |
1988 | prot->twsk_prot->twsk_slab = |
1989 | kmem_cache_create(timewait_sock_slab_name, | |
1990 | prot->twsk_prot->twsk_obj_size, | |
1991 | 0, SLAB_HWCACHE_ALIGN, | |
20c2df83 | 1992 | NULL); |
6d6ee43e | 1993 | if (prot->twsk_prot->twsk_slab == NULL) |
8feaf0c0 ACM |
1994 | goto out_free_timewait_sock_slab_name; |
1995 | } | |
1da177e4 LT |
1996 | } |
1997 | ||
2a278051 | 1998 | write_lock(&proto_list_lock); |
1da177e4 | 1999 | list_add(&prot->node, &proto_list); |
1da177e4 | 2000 | write_unlock(&proto_list_lock); |
b733c007 PE |
2001 | return 0; |
2002 | ||
8feaf0c0 ACM |
2003 | out_free_timewait_sock_slab_name: |
2004 | kfree(timewait_sock_slab_name); | |
2005 | out_free_request_sock_slab: | |
2006 | if (prot->rsk_prot && prot->rsk_prot->slab) { | |
2007 | kmem_cache_destroy(prot->rsk_prot->slab); | |
2008 | prot->rsk_prot->slab = NULL; | |
2009 | } | |
2e6599cb ACM |
2010 | out_free_request_sock_slab_name: |
2011 | kfree(request_sock_slab_name); | |
2012 | out_free_sock_slab: | |
2013 | kmem_cache_destroy(prot->slab); | |
2014 | prot->slab = NULL; | |
286ab3d4 | 2015 | out_free_inuse: |
65f76517 | 2016 | sock_prot_inuse_free(prot); |
b733c007 PE |
2017 | out: |
2018 | return -ENOBUFS; | |
1da177e4 LT |
2019 | } |
2020 | ||
2021 | EXPORT_SYMBOL(proto_register); | |
2022 | ||
2023 | void proto_unregister(struct proto *prot) | |
2024 | { | |
2025 | write_lock(&proto_list_lock); | |
0a3f4358 PM |
2026 | list_del(&prot->node); |
2027 | write_unlock(&proto_list_lock); | |
1da177e4 | 2028 | |
65f76517 | 2029 | sock_prot_inuse_free(prot); |
ebb53d75 | 2030 | |
1da177e4 LT |
2031 | if (prot->slab != NULL) { |
2032 | kmem_cache_destroy(prot->slab); | |
2033 | prot->slab = NULL; | |
2034 | } | |
2035 | ||
2e6599cb ACM |
2036 | if (prot->rsk_prot != NULL && prot->rsk_prot->slab != NULL) { |
2037 | const char *name = kmem_cache_name(prot->rsk_prot->slab); | |
2038 | ||
2039 | kmem_cache_destroy(prot->rsk_prot->slab); | |
2040 | kfree(name); | |
2041 | prot->rsk_prot->slab = NULL; | |
2042 | } | |
2043 | ||
6d6ee43e ACM |
2044 | if (prot->twsk_prot != NULL && prot->twsk_prot->twsk_slab != NULL) { |
2045 | const char *name = kmem_cache_name(prot->twsk_prot->twsk_slab); | |
8feaf0c0 | 2046 | |
6d6ee43e | 2047 | kmem_cache_destroy(prot->twsk_prot->twsk_slab); |
8feaf0c0 | 2048 | kfree(name); |
6d6ee43e | 2049 | prot->twsk_prot->twsk_slab = NULL; |
8feaf0c0 | 2050 | } |
1da177e4 LT |
2051 | } |
2052 | ||
2053 | EXPORT_SYMBOL(proto_unregister); | |
2054 | ||
2055 | #ifdef CONFIG_PROC_FS | |
1da177e4 | 2056 | static void *proto_seq_start(struct seq_file *seq, loff_t *pos) |
9a429c49 | 2057 | __acquires(proto_list_lock) |
1da177e4 LT |
2058 | { |
2059 | read_lock(&proto_list_lock); | |
60f0438a | 2060 | return seq_list_start_head(&proto_list, *pos); |
1da177e4 LT |
2061 | } |
2062 | ||
2063 | static void *proto_seq_next(struct seq_file *seq, void *v, loff_t *pos) | |
2064 | { | |
60f0438a | 2065 | return seq_list_next(v, &proto_list, pos); |
1da177e4 LT |
2066 | } |
2067 | ||
2068 | static void proto_seq_stop(struct seq_file *seq, void *v) | |
9a429c49 | 2069 | __releases(proto_list_lock) |
1da177e4 LT |
2070 | { |
2071 | read_unlock(&proto_list_lock); | |
2072 | } | |
2073 | ||
2074 | static char proto_method_implemented(const void *method) | |
2075 | { | |
2076 | return method == NULL ? 'n' : 'y'; | |
2077 | } | |
2078 | ||
2079 | static void proto_seq_printf(struct seq_file *seq, struct proto *proto) | |
2080 | { | |
2081 | seq_printf(seq, "%-9s %4u %6d %6d %-3s %6u %-3s %-10s " | |
2082 | "%2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c\n", | |
2083 | proto->name, | |
2084 | proto->obj_size, | |
2085 | proto->sockets_allocated != NULL ? atomic_read(proto->sockets_allocated) : -1, | |
2086 | proto->memory_allocated != NULL ? atomic_read(proto->memory_allocated) : -1, | |
2087 | proto->memory_pressure != NULL ? *proto->memory_pressure ? "yes" : "no" : "NI", | |
2088 | proto->max_header, | |
2089 | proto->slab == NULL ? "no" : "yes", | |
2090 | module_name(proto->owner), | |
2091 | proto_method_implemented(proto->close), | |
2092 | proto_method_implemented(proto->connect), | |
2093 | proto_method_implemented(proto->disconnect), | |
2094 | proto_method_implemented(proto->accept), | |
2095 | proto_method_implemented(proto->ioctl), | |
2096 | proto_method_implemented(proto->init), | |
2097 | proto_method_implemented(proto->destroy), | |
2098 | proto_method_implemented(proto->shutdown), | |
2099 | proto_method_implemented(proto->setsockopt), | |
2100 | proto_method_implemented(proto->getsockopt), | |
2101 | proto_method_implemented(proto->sendmsg), | |
2102 | proto_method_implemented(proto->recvmsg), | |
2103 | proto_method_implemented(proto->sendpage), | |
2104 | proto_method_implemented(proto->bind), | |
2105 | proto_method_implemented(proto->backlog_rcv), | |
2106 | proto_method_implemented(proto->hash), | |
2107 | proto_method_implemented(proto->unhash), | |
2108 | proto_method_implemented(proto->get_port), | |
2109 | proto_method_implemented(proto->enter_memory_pressure)); | |
2110 | } | |
2111 | ||
2112 | static int proto_seq_show(struct seq_file *seq, void *v) | |
2113 | { | |
60f0438a | 2114 | if (v == &proto_list) |
1da177e4 LT |
2115 | seq_printf(seq, "%-9s %-4s %-8s %-6s %-5s %-7s %-4s %-10s %s", |
2116 | "protocol", | |
2117 | "size", | |
2118 | "sockets", | |
2119 | "memory", | |
2120 | "press", | |
2121 | "maxhdr", | |
2122 | "slab", | |
2123 | "module", | |
2124 | "cl co di ac io in de sh ss gs se re sp bi br ha uh gp em\n"); | |
2125 | else | |
60f0438a | 2126 | proto_seq_printf(seq, list_entry(v, struct proto, node)); |
1da177e4 LT |
2127 | return 0; |
2128 | } | |
2129 | ||
f690808e | 2130 | static const struct seq_operations proto_seq_ops = { |
1da177e4 LT |
2131 | .start = proto_seq_start, |
2132 | .next = proto_seq_next, | |
2133 | .stop = proto_seq_stop, | |
2134 | .show = proto_seq_show, | |
2135 | }; | |
2136 | ||
2137 | static int proto_seq_open(struct inode *inode, struct file *file) | |
2138 | { | |
2139 | return seq_open(file, &proto_seq_ops); | |
2140 | } | |
2141 | ||
9a32144e | 2142 | static const struct file_operations proto_seq_fops = { |
1da177e4 LT |
2143 | .owner = THIS_MODULE, |
2144 | .open = proto_seq_open, | |
2145 | .read = seq_read, | |
2146 | .llseek = seq_lseek, | |
2147 | .release = seq_release, | |
2148 | }; | |
2149 | ||
2150 | static int __init proto_init(void) | |
2151 | { | |
2152 | /* register /proc/net/protocols */ | |
457c4cbc | 2153 | return proc_net_fops_create(&init_net, "protocols", S_IRUGO, &proto_seq_fops) == NULL ? -ENOBUFS : 0; |
1da177e4 LT |
2154 | } |
2155 | ||
2156 | subsys_initcall(proto_init); | |
2157 | ||
2158 | #endif /* PROC_FS */ | |
2159 | ||
2160 | EXPORT_SYMBOL(sk_alloc); | |
2161 | EXPORT_SYMBOL(sk_free); | |
2162 | EXPORT_SYMBOL(sk_send_sigurg); | |
2163 | EXPORT_SYMBOL(sock_alloc_send_skb); | |
2164 | EXPORT_SYMBOL(sock_init_data); | |
2165 | EXPORT_SYMBOL(sock_kfree_s); | |
2166 | EXPORT_SYMBOL(sock_kmalloc); | |
2167 | EXPORT_SYMBOL(sock_no_accept); | |
2168 | EXPORT_SYMBOL(sock_no_bind); | |
2169 | EXPORT_SYMBOL(sock_no_connect); | |
2170 | EXPORT_SYMBOL(sock_no_getname); | |
2171 | EXPORT_SYMBOL(sock_no_getsockopt); | |
2172 | EXPORT_SYMBOL(sock_no_ioctl); | |
2173 | EXPORT_SYMBOL(sock_no_listen); | |
2174 | EXPORT_SYMBOL(sock_no_mmap); | |
2175 | EXPORT_SYMBOL(sock_no_poll); | |
2176 | EXPORT_SYMBOL(sock_no_recvmsg); | |
2177 | EXPORT_SYMBOL(sock_no_sendmsg); | |
2178 | EXPORT_SYMBOL(sock_no_sendpage); | |
2179 | EXPORT_SYMBOL(sock_no_setsockopt); | |
2180 | EXPORT_SYMBOL(sock_no_shutdown); | |
2181 | EXPORT_SYMBOL(sock_no_socketpair); | |
2182 | EXPORT_SYMBOL(sock_rfree); | |
2183 | EXPORT_SYMBOL(sock_setsockopt); | |
2184 | EXPORT_SYMBOL(sock_wfree); | |
2185 | EXPORT_SYMBOL(sock_wmalloc); | |
2186 | EXPORT_SYMBOL(sock_i_uid); | |
2187 | EXPORT_SYMBOL(sock_i_ino); | |
1da177e4 | 2188 | EXPORT_SYMBOL(sysctl_optmem_max); |