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Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * INET An implementation of the TCP/IP protocol suite for the LINUX | |
3 | * operating system. INET is implemented using the BSD Socket | |
4 | * interface as the means of communication with the user level. | |
5 | * | |
6 | * Generic socket support routines. Memory allocators, socket lock/release | |
7 | * handler for protocols to use and generic option handler. | |
8 | * | |
9 | * | |
02c30a84 | 10 | * Authors: Ross Biro |
1da177e4 LT |
11 | * Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG> |
12 | * Florian La Roche, <flla@stud.uni-sb.de> | |
13 | * Alan Cox, <A.Cox@swansea.ac.uk> | |
14 | * | |
15 | * Fixes: | |
16 | * Alan Cox : Numerous verify_area() problems | |
17 | * Alan Cox : Connecting on a connecting socket | |
18 | * now returns an error for tcp. | |
19 | * Alan Cox : sock->protocol is set correctly. | |
20 | * and is not sometimes left as 0. | |
21 | * Alan Cox : connect handles icmp errors on a | |
22 | * connect properly. Unfortunately there | |
23 | * is a restart syscall nasty there. I | |
24 | * can't match BSD without hacking the C | |
25 | * library. Ideas urgently sought! | |
26 | * Alan Cox : Disallow bind() to addresses that are | |
27 | * not ours - especially broadcast ones!! | |
28 | * Alan Cox : Socket 1024 _IS_ ok for users. (fencepost) | |
29 | * Alan Cox : sock_wfree/sock_rfree don't destroy sockets, | |
30 | * instead they leave that for the DESTROY timer. | |
31 | * Alan Cox : Clean up error flag in accept | |
32 | * Alan Cox : TCP ack handling is buggy, the DESTROY timer | |
33 | * was buggy. Put a remove_sock() in the handler | |
34 | * for memory when we hit 0. Also altered the timer | |
4ec93edb | 35 | * code. The ACK stuff can wait and needs major |
1da177e4 LT |
36 | * TCP layer surgery. |
37 | * Alan Cox : Fixed TCP ack bug, removed remove sock | |
38 | * and fixed timer/inet_bh race. | |
39 | * Alan Cox : Added zapped flag for TCP | |
40 | * Alan Cox : Move kfree_skb into skbuff.c and tidied up surplus code | |
41 | * Alan Cox : for new sk_buff allocations wmalloc/rmalloc now call alloc_skb | |
42 | * Alan Cox : kfree_s calls now are kfree_skbmem so we can track skb resources | |
43 | * Alan Cox : Supports socket option broadcast now as does udp. Packet and raw need fixing. | |
44 | * Alan Cox : Added RCVBUF,SNDBUF size setting. It suddenly occurred to me how easy it was so... | |
45 | * Rick Sladkey : Relaxed UDP rules for matching packets. | |
46 | * C.E.Hawkins : IFF_PROMISC/SIOCGHWADDR support | |
47 | * Pauline Middelink : identd support | |
48 | * Alan Cox : Fixed connect() taking signals I think. | |
49 | * Alan Cox : SO_LINGER supported | |
50 | * Alan Cox : Error reporting fixes | |
51 | * Anonymous : inet_create tidied up (sk->reuse setting) | |
52 | * Alan Cox : inet sockets don't set sk->type! | |
53 | * Alan Cox : Split socket option code | |
54 | * Alan Cox : Callbacks | |
55 | * Alan Cox : Nagle flag for Charles & Johannes stuff | |
56 | * Alex : Removed restriction on inet fioctl | |
57 | * Alan Cox : Splitting INET from NET core | |
58 | * Alan Cox : Fixed bogus SO_TYPE handling in getsockopt() | |
59 | * Adam Caldwell : Missing return in SO_DONTROUTE/SO_DEBUG code | |
60 | * Alan Cox : Split IP from generic code | |
61 | * Alan Cox : New kfree_skbmem() | |
62 | * Alan Cox : Make SO_DEBUG superuser only. | |
63 | * Alan Cox : Allow anyone to clear SO_DEBUG | |
64 | * (compatibility fix) | |
65 | * Alan Cox : Added optimistic memory grabbing for AF_UNIX throughput. | |
66 | * Alan Cox : Allocator for a socket is settable. | |
67 | * Alan Cox : SO_ERROR includes soft errors. | |
68 | * Alan Cox : Allow NULL arguments on some SO_ opts | |
69 | * Alan Cox : Generic socket allocation to make hooks | |
70 | * easier (suggested by Craig Metz). | |
71 | * Michael Pall : SO_ERROR returns positive errno again | |
72 | * Steve Whitehouse: Added default destructor to free | |
73 | * protocol private data. | |
74 | * Steve Whitehouse: Added various other default routines | |
75 | * common to several socket families. | |
76 | * Chris Evans : Call suser() check last on F_SETOWN | |
77 | * Jay Schulist : Added SO_ATTACH_FILTER and SO_DETACH_FILTER. | |
78 | * Andi Kleen : Add sock_kmalloc()/sock_kfree_s() | |
79 | * Andi Kleen : Fix write_space callback | |
80 | * Chris Evans : Security fixes - signedness again | |
81 | * Arnaldo C. Melo : cleanups, use skb_queue_purge | |
82 | * | |
83 | * To Fix: | |
84 | * | |
85 | * | |
86 | * This program is free software; you can redistribute it and/or | |
87 | * modify it under the terms of the GNU General Public License | |
88 | * as published by the Free Software Foundation; either version | |
89 | * 2 of the License, or (at your option) any later version. | |
90 | */ | |
91 | ||
4fc268d2 | 92 | #include <linux/capability.h> |
1da177e4 LT |
93 | #include <linux/errno.h> |
94 | #include <linux/types.h> | |
95 | #include <linux/socket.h> | |
96 | #include <linux/in.h> | |
97 | #include <linux/kernel.h> | |
1da177e4 LT |
98 | #include <linux/module.h> |
99 | #include <linux/proc_fs.h> | |
100 | #include <linux/seq_file.h> | |
101 | #include <linux/sched.h> | |
102 | #include <linux/timer.h> | |
103 | #include <linux/string.h> | |
104 | #include <linux/sockios.h> | |
105 | #include <linux/net.h> | |
106 | #include <linux/mm.h> | |
107 | #include <linux/slab.h> | |
108 | #include <linux/interrupt.h> | |
109 | #include <linux/poll.h> | |
110 | #include <linux/tcp.h> | |
111 | #include <linux/init.h> | |
a1f8e7f7 | 112 | #include <linux/highmem.h> |
1da177e4 LT |
113 | |
114 | #include <asm/uaccess.h> | |
115 | #include <asm/system.h> | |
116 | ||
117 | #include <linux/netdevice.h> | |
118 | #include <net/protocol.h> | |
119 | #include <linux/skbuff.h> | |
457c4cbc | 120 | #include <net/net_namespace.h> |
2e6599cb | 121 | #include <net/request_sock.h> |
1da177e4 | 122 | #include <net/sock.h> |
20d49473 | 123 | #include <linux/net_tstamp.h> |
1da177e4 LT |
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 | ||
a5b5bb9a IM |
140 | /* |
141 | * Make lock validator output more readable. (we pre-construct these | |
142 | * strings build-time, so that runtime initialization of socket | |
143 | * locks is fast): | |
144 | */ | |
36cbd3dc | 145 | static const char *const af_family_key_strings[AF_MAX+1] = { |
a5b5bb9a IM |
146 | "sk_lock-AF_UNSPEC", "sk_lock-AF_UNIX" , "sk_lock-AF_INET" , |
147 | "sk_lock-AF_AX25" , "sk_lock-AF_IPX" , "sk_lock-AF_APPLETALK", | |
148 | "sk_lock-AF_NETROM", "sk_lock-AF_BRIDGE" , "sk_lock-AF_ATMPVC" , | |
149 | "sk_lock-AF_X25" , "sk_lock-AF_INET6" , "sk_lock-AF_ROSE" , | |
150 | "sk_lock-AF_DECnet", "sk_lock-AF_NETBEUI" , "sk_lock-AF_SECURITY" , | |
151 | "sk_lock-AF_KEY" , "sk_lock-AF_NETLINK" , "sk_lock-AF_PACKET" , | |
152 | "sk_lock-AF_ASH" , "sk_lock-AF_ECONET" , "sk_lock-AF_ATMSVC" , | |
cbd151bf | 153 | "sk_lock-AF_RDS" , "sk_lock-AF_SNA" , "sk_lock-AF_IRDA" , |
a5b5bb9a | 154 | "sk_lock-AF_PPPOX" , "sk_lock-AF_WANPIPE" , "sk_lock-AF_LLC" , |
cd05acfe | 155 | "sk_lock-27" , "sk_lock-28" , "sk_lock-AF_CAN" , |
17926a79 | 156 | "sk_lock-AF_TIPC" , "sk_lock-AF_BLUETOOTH", "sk_lock-IUCV" , |
bce7b154 | 157 | "sk_lock-AF_RXRPC" , "sk_lock-AF_ISDN" , "sk_lock-AF_PHONET" , |
fcb94e42 | 158 | "sk_lock-AF_IEEE802154", |
bce7b154 | 159 | "sk_lock-AF_MAX" |
a5b5bb9a | 160 | }; |
36cbd3dc | 161 | static const char *const af_family_slock_key_strings[AF_MAX+1] = { |
a5b5bb9a IM |
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" , | |
cbd151bf | 169 | "slock-AF_RDS" , "slock-AF_SNA" , "slock-AF_IRDA" , |
a5b5bb9a | 170 | "slock-AF_PPPOX" , "slock-AF_WANPIPE" , "slock-AF_LLC" , |
cd05acfe | 171 | "slock-27" , "slock-28" , "slock-AF_CAN" , |
17926a79 | 172 | "slock-AF_TIPC" , "slock-AF_BLUETOOTH", "slock-AF_IUCV" , |
bce7b154 | 173 | "slock-AF_RXRPC" , "slock-AF_ISDN" , "slock-AF_PHONET" , |
fcb94e42 | 174 | "slock-AF_IEEE802154", |
bce7b154 | 175 | "slock-AF_MAX" |
a5b5bb9a | 176 | }; |
36cbd3dc | 177 | static const char *const af_family_clock_key_strings[AF_MAX+1] = { |
443aef0e PZ |
178 | "clock-AF_UNSPEC", "clock-AF_UNIX" , "clock-AF_INET" , |
179 | "clock-AF_AX25" , "clock-AF_IPX" , "clock-AF_APPLETALK", | |
180 | "clock-AF_NETROM", "clock-AF_BRIDGE" , "clock-AF_ATMPVC" , | |
181 | "clock-AF_X25" , "clock-AF_INET6" , "clock-AF_ROSE" , | |
182 | "clock-AF_DECnet", "clock-AF_NETBEUI" , "clock-AF_SECURITY" , | |
183 | "clock-AF_KEY" , "clock-AF_NETLINK" , "clock-AF_PACKET" , | |
184 | "clock-AF_ASH" , "clock-AF_ECONET" , "clock-AF_ATMSVC" , | |
cbd151bf | 185 | "clock-AF_RDS" , "clock-AF_SNA" , "clock-AF_IRDA" , |
443aef0e | 186 | "clock-AF_PPPOX" , "clock-AF_WANPIPE" , "clock-AF_LLC" , |
b4942af6 | 187 | "clock-27" , "clock-28" , "clock-AF_CAN" , |
e51f802b | 188 | "clock-AF_TIPC" , "clock-AF_BLUETOOTH", "clock-AF_IUCV" , |
bce7b154 | 189 | "clock-AF_RXRPC" , "clock-AF_ISDN" , "clock-AF_PHONET" , |
fcb94e42 | 190 | "clock-AF_IEEE802154", |
bce7b154 | 191 | "clock-AF_MAX" |
443aef0e | 192 | }; |
da21f24d IM |
193 | |
194 | /* | |
195 | * sk_callback_lock locking rules are per-address-family, | |
196 | * so split the lock classes by using a per-AF key: | |
197 | */ | |
198 | static struct lock_class_key af_callback_keys[AF_MAX]; | |
199 | ||
1da177e4 LT |
200 | /* Take into consideration the size of the struct sk_buff overhead in the |
201 | * determination of these values, since that is non-constant across | |
202 | * platforms. This makes socket queueing behavior and performance | |
203 | * not depend upon such differences. | |
204 | */ | |
205 | #define _SK_MEM_PACKETS 256 | |
206 | #define _SK_MEM_OVERHEAD (sizeof(struct sk_buff) + 256) | |
207 | #define SK_WMEM_MAX (_SK_MEM_OVERHEAD * _SK_MEM_PACKETS) | |
208 | #define SK_RMEM_MAX (_SK_MEM_OVERHEAD * _SK_MEM_PACKETS) | |
209 | ||
210 | /* Run time adjustable parameters. */ | |
ab32ea5d BH |
211 | __u32 sysctl_wmem_max __read_mostly = SK_WMEM_MAX; |
212 | __u32 sysctl_rmem_max __read_mostly = SK_RMEM_MAX; | |
213 | __u32 sysctl_wmem_default __read_mostly = SK_WMEM_MAX; | |
214 | __u32 sysctl_rmem_default __read_mostly = SK_RMEM_MAX; | |
1da177e4 LT |
215 | |
216 | /* Maximal space eaten by iovec or ancilliary data plus some space */ | |
ab32ea5d | 217 | int sysctl_optmem_max __read_mostly = sizeof(unsigned long)*(2*UIO_MAXIOV+512); |
2a91525c | 218 | EXPORT_SYMBOL(sysctl_optmem_max); |
1da177e4 LT |
219 | |
220 | static int sock_set_timeout(long *timeo_p, char __user *optval, int optlen) | |
221 | { | |
222 | struct timeval tv; | |
223 | ||
224 | if (optlen < sizeof(tv)) | |
225 | return -EINVAL; | |
226 | if (copy_from_user(&tv, optval, sizeof(tv))) | |
227 | return -EFAULT; | |
ba78073e VA |
228 | if (tv.tv_usec < 0 || tv.tv_usec >= USEC_PER_SEC) |
229 | return -EDOM; | |
1da177e4 | 230 | |
ba78073e | 231 | if (tv.tv_sec < 0) { |
6f11df83 AM |
232 | static int warned __read_mostly; |
233 | ||
ba78073e | 234 | *timeo_p = 0; |
50aab54f | 235 | if (warned < 10 && net_ratelimit()) { |
ba78073e VA |
236 | warned++; |
237 | printk(KERN_INFO "sock_set_timeout: `%s' (pid %d) " | |
238 | "tries to set negative timeout\n", | |
ba25f9dc | 239 | current->comm, task_pid_nr(current)); |
50aab54f | 240 | } |
ba78073e VA |
241 | return 0; |
242 | } | |
1da177e4 LT |
243 | *timeo_p = MAX_SCHEDULE_TIMEOUT; |
244 | if (tv.tv_sec == 0 && tv.tv_usec == 0) | |
245 | return 0; | |
246 | if (tv.tv_sec < (MAX_SCHEDULE_TIMEOUT/HZ - 1)) | |
247 | *timeo_p = tv.tv_sec*HZ + (tv.tv_usec+(1000000/HZ-1))/(1000000/HZ); | |
248 | return 0; | |
249 | } | |
250 | ||
251 | static void sock_warn_obsolete_bsdism(const char *name) | |
252 | { | |
253 | static int warned; | |
254 | static char warncomm[TASK_COMM_LEN]; | |
4ec93edb YH |
255 | if (strcmp(warncomm, current->comm) && warned < 5) { |
256 | strcpy(warncomm, current->comm); | |
1da177e4 LT |
257 | printk(KERN_WARNING "process `%s' is using obsolete " |
258 | "%s SO_BSDCOMPAT\n", warncomm, name); | |
259 | warned++; | |
260 | } | |
261 | } | |
262 | ||
20d49473 | 263 | static void sock_disable_timestamp(struct sock *sk, int flag) |
4ec93edb | 264 | { |
20d49473 PO |
265 | if (sock_flag(sk, flag)) { |
266 | sock_reset_flag(sk, flag); | |
267 | if (!sock_flag(sk, SOCK_TIMESTAMP) && | |
268 | !sock_flag(sk, SOCK_TIMESTAMPING_RX_SOFTWARE)) { | |
269 | net_disable_timestamp(); | |
270 | } | |
1da177e4 LT |
271 | } |
272 | } | |
273 | ||
274 | ||
f0088a50 DV |
275 | int sock_queue_rcv_skb(struct sock *sk, struct sk_buff *skb) |
276 | { | |
766e9037 | 277 | int err; |
f0088a50 | 278 | int skb_len; |
3b885787 NH |
279 | unsigned long flags; |
280 | struct sk_buff_head *list = &sk->sk_receive_queue; | |
f0088a50 | 281 | |
9ee6b7f1 | 282 | /* Cast sk->rcvbuf to unsigned... It's pointless, but reduces |
f0088a50 DV |
283 | number of warnings when compiling with -W --ANK |
284 | */ | |
285 | if (atomic_read(&sk->sk_rmem_alloc) + skb->truesize >= | |
286 | (unsigned)sk->sk_rcvbuf) { | |
766e9037 ED |
287 | atomic_inc(&sk->sk_drops); |
288 | return -ENOMEM; | |
f0088a50 DV |
289 | } |
290 | ||
fda9ef5d | 291 | err = sk_filter(sk, skb); |
f0088a50 | 292 | if (err) |
766e9037 | 293 | return err; |
f0088a50 | 294 | |
3ab224be | 295 | if (!sk_rmem_schedule(sk, skb->truesize)) { |
766e9037 ED |
296 | atomic_inc(&sk->sk_drops); |
297 | return -ENOBUFS; | |
3ab224be HA |
298 | } |
299 | ||
f0088a50 DV |
300 | skb->dev = NULL; |
301 | skb_set_owner_r(skb, sk); | |
49ad9599 | 302 | |
f0088a50 DV |
303 | /* Cache the SKB length before we tack it onto the receive |
304 | * queue. Once it is added it no longer belongs to us and | |
305 | * may be freed by other threads of control pulling packets | |
306 | * from the queue. | |
307 | */ | |
308 | skb_len = skb->len; | |
309 | ||
3b885787 NH |
310 | spin_lock_irqsave(&list->lock, flags); |
311 | skb->dropcount = atomic_read(&sk->sk_drops); | |
312 | __skb_queue_tail(list, skb); | |
313 | spin_unlock_irqrestore(&list->lock, flags); | |
f0088a50 DV |
314 | |
315 | if (!sock_flag(sk, SOCK_DEAD)) | |
316 | sk->sk_data_ready(sk, skb_len); | |
766e9037 | 317 | return 0; |
f0088a50 DV |
318 | } |
319 | EXPORT_SYMBOL(sock_queue_rcv_skb); | |
320 | ||
58a5a7b9 | 321 | int sk_receive_skb(struct sock *sk, struct sk_buff *skb, const int nested) |
f0088a50 DV |
322 | { |
323 | int rc = NET_RX_SUCCESS; | |
324 | ||
fda9ef5d | 325 | if (sk_filter(sk, skb)) |
f0088a50 DV |
326 | goto discard_and_relse; |
327 | ||
328 | skb->dev = NULL; | |
329 | ||
58a5a7b9 ACM |
330 | if (nested) |
331 | bh_lock_sock_nested(sk); | |
332 | else | |
333 | bh_lock_sock(sk); | |
a5b5bb9a IM |
334 | if (!sock_owned_by_user(sk)) { |
335 | /* | |
336 | * trylock + unlock semantics: | |
337 | */ | |
338 | mutex_acquire(&sk->sk_lock.dep_map, 0, 1, _RET_IP_); | |
339 | ||
c57943a1 | 340 | rc = sk_backlog_rcv(sk, skb); |
a5b5bb9a IM |
341 | |
342 | mutex_release(&sk->sk_lock.dep_map, 1, _RET_IP_); | |
343 | } else | |
f0088a50 DV |
344 | sk_add_backlog(sk, skb); |
345 | bh_unlock_sock(sk); | |
346 | out: | |
347 | sock_put(sk); | |
348 | return rc; | |
349 | discard_and_relse: | |
350 | kfree_skb(skb); | |
351 | goto out; | |
352 | } | |
353 | EXPORT_SYMBOL(sk_receive_skb); | |
354 | ||
ea94ff3b KK |
355 | void sk_reset_txq(struct sock *sk) |
356 | { | |
357 | sk_tx_queue_clear(sk); | |
358 | } | |
359 | EXPORT_SYMBOL(sk_reset_txq); | |
360 | ||
f0088a50 DV |
361 | struct dst_entry *__sk_dst_check(struct sock *sk, u32 cookie) |
362 | { | |
363 | struct dst_entry *dst = sk->sk_dst_cache; | |
364 | ||
365 | if (dst && dst->obsolete && dst->ops->check(dst, cookie) == NULL) { | |
e022f0b4 | 366 | sk_tx_queue_clear(sk); |
f0088a50 DV |
367 | sk->sk_dst_cache = NULL; |
368 | dst_release(dst); | |
369 | return NULL; | |
370 | } | |
371 | ||
372 | return dst; | |
373 | } | |
374 | EXPORT_SYMBOL(__sk_dst_check); | |
375 | ||
376 | struct dst_entry *sk_dst_check(struct sock *sk, u32 cookie) | |
377 | { | |
378 | struct dst_entry *dst = sk_dst_get(sk); | |
379 | ||
380 | if (dst && dst->obsolete && dst->ops->check(dst, cookie) == NULL) { | |
381 | sk_dst_reset(sk); | |
382 | dst_release(dst); | |
383 | return NULL; | |
384 | } | |
385 | ||
386 | return dst; | |
387 | } | |
388 | EXPORT_SYMBOL(sk_dst_check); | |
389 | ||
4878809f DM |
390 | static int sock_bindtodevice(struct sock *sk, char __user *optval, int optlen) |
391 | { | |
392 | int ret = -ENOPROTOOPT; | |
393 | #ifdef CONFIG_NETDEVICES | |
3b1e0a65 | 394 | struct net *net = sock_net(sk); |
4878809f DM |
395 | char devname[IFNAMSIZ]; |
396 | int index; | |
397 | ||
398 | /* Sorry... */ | |
399 | ret = -EPERM; | |
400 | if (!capable(CAP_NET_RAW)) | |
401 | goto out; | |
402 | ||
403 | ret = -EINVAL; | |
404 | if (optlen < 0) | |
405 | goto out; | |
406 | ||
407 | /* Bind this socket to a particular device like "eth0", | |
408 | * as specified in the passed interface name. If the | |
409 | * name is "" or the option length is zero the socket | |
410 | * is not bound. | |
411 | */ | |
412 | if (optlen > IFNAMSIZ - 1) | |
413 | optlen = IFNAMSIZ - 1; | |
414 | memset(devname, 0, sizeof(devname)); | |
415 | ||
416 | ret = -EFAULT; | |
417 | if (copy_from_user(devname, optval, optlen)) | |
418 | goto out; | |
419 | ||
420 | if (devname[0] == '\0') { | |
421 | index = 0; | |
422 | } else { | |
881d966b | 423 | struct net_device *dev = dev_get_by_name(net, devname); |
4878809f DM |
424 | |
425 | ret = -ENODEV; | |
426 | if (!dev) | |
427 | goto out; | |
428 | ||
429 | index = dev->ifindex; | |
430 | dev_put(dev); | |
431 | } | |
432 | ||
433 | lock_sock(sk); | |
434 | sk->sk_bound_dev_if = index; | |
435 | sk_dst_reset(sk); | |
436 | release_sock(sk); | |
437 | ||
438 | ret = 0; | |
439 | ||
440 | out: | |
441 | #endif | |
442 | ||
443 | return ret; | |
444 | } | |
445 | ||
c0ef877b PE |
446 | static inline void sock_valbool_flag(struct sock *sk, int bit, int valbool) |
447 | { | |
448 | if (valbool) | |
449 | sock_set_flag(sk, bit); | |
450 | else | |
451 | sock_reset_flag(sk, bit); | |
452 | } | |
453 | ||
1da177e4 LT |
454 | /* |
455 | * This is meant for all protocols to use and covers goings on | |
456 | * at the socket level. Everything here is generic. | |
457 | */ | |
458 | ||
459 | int sock_setsockopt(struct socket *sock, int level, int optname, | |
b7058842 | 460 | char __user *optval, unsigned int optlen) |
1da177e4 | 461 | { |
2a91525c | 462 | struct sock *sk = sock->sk; |
1da177e4 LT |
463 | int val; |
464 | int valbool; | |
465 | struct linger ling; | |
466 | int ret = 0; | |
4ec93edb | 467 | |
1da177e4 LT |
468 | /* |
469 | * Options without arguments | |
470 | */ | |
471 | ||
4878809f DM |
472 | if (optname == SO_BINDTODEVICE) |
473 | return sock_bindtodevice(sk, optval, optlen); | |
474 | ||
e71a4783 SH |
475 | if (optlen < sizeof(int)) |
476 | return -EINVAL; | |
4ec93edb | 477 | |
1da177e4 LT |
478 | if (get_user(val, (int __user *)optval)) |
479 | return -EFAULT; | |
4ec93edb | 480 | |
2a91525c | 481 | valbool = val ? 1 : 0; |
1da177e4 LT |
482 | |
483 | lock_sock(sk); | |
484 | ||
2a91525c | 485 | switch (optname) { |
e71a4783 | 486 | case SO_DEBUG: |
2a91525c | 487 | if (val && !capable(CAP_NET_ADMIN)) |
e71a4783 | 488 | ret = -EACCES; |
2a91525c | 489 | else |
c0ef877b | 490 | sock_valbool_flag(sk, SOCK_DBG, valbool); |
e71a4783 SH |
491 | break; |
492 | case SO_REUSEADDR: | |
493 | sk->sk_reuse = valbool; | |
494 | break; | |
495 | case SO_TYPE: | |
49c794e9 | 496 | case SO_PROTOCOL: |
0d6038ee | 497 | case SO_DOMAIN: |
e71a4783 SH |
498 | case SO_ERROR: |
499 | ret = -ENOPROTOOPT; | |
500 | break; | |
501 | case SO_DONTROUTE: | |
c0ef877b | 502 | sock_valbool_flag(sk, SOCK_LOCALROUTE, valbool); |
e71a4783 SH |
503 | break; |
504 | case SO_BROADCAST: | |
505 | sock_valbool_flag(sk, SOCK_BROADCAST, valbool); | |
506 | break; | |
507 | case SO_SNDBUF: | |
508 | /* Don't error on this BSD doesn't and if you think | |
509 | about it this is right. Otherwise apps have to | |
510 | play 'guess the biggest size' games. RCVBUF/SNDBUF | |
511 | are treated in BSD as hints */ | |
512 | ||
513 | if (val > sysctl_wmem_max) | |
514 | val = sysctl_wmem_max; | |
b0573dea | 515 | set_sndbuf: |
e71a4783 SH |
516 | sk->sk_userlocks |= SOCK_SNDBUF_LOCK; |
517 | if ((val * 2) < SOCK_MIN_SNDBUF) | |
518 | sk->sk_sndbuf = SOCK_MIN_SNDBUF; | |
519 | else | |
520 | sk->sk_sndbuf = val * 2; | |
1da177e4 | 521 | |
e71a4783 SH |
522 | /* |
523 | * Wake up sending tasks if we | |
524 | * upped the value. | |
525 | */ | |
526 | sk->sk_write_space(sk); | |
527 | break; | |
1da177e4 | 528 | |
e71a4783 SH |
529 | case SO_SNDBUFFORCE: |
530 | if (!capable(CAP_NET_ADMIN)) { | |
531 | ret = -EPERM; | |
532 | break; | |
533 | } | |
534 | goto set_sndbuf; | |
b0573dea | 535 | |
e71a4783 SH |
536 | case SO_RCVBUF: |
537 | /* Don't error on this BSD doesn't and if you think | |
538 | about it this is right. Otherwise apps have to | |
539 | play 'guess the biggest size' games. RCVBUF/SNDBUF | |
540 | are treated in BSD as hints */ | |
4ec93edb | 541 | |
e71a4783 SH |
542 | if (val > sysctl_rmem_max) |
543 | val = sysctl_rmem_max; | |
b0573dea | 544 | set_rcvbuf: |
e71a4783 SH |
545 | sk->sk_userlocks |= SOCK_RCVBUF_LOCK; |
546 | /* | |
547 | * We double it on the way in to account for | |
548 | * "struct sk_buff" etc. overhead. Applications | |
549 | * assume that the SO_RCVBUF setting they make will | |
550 | * allow that much actual data to be received on that | |
551 | * socket. | |
552 | * | |
553 | * Applications are unaware that "struct sk_buff" and | |
554 | * other overheads allocate from the receive buffer | |
555 | * during socket buffer allocation. | |
556 | * | |
557 | * And after considering the possible alternatives, | |
558 | * returning the value we actually used in getsockopt | |
559 | * is the most desirable behavior. | |
560 | */ | |
561 | if ((val * 2) < SOCK_MIN_RCVBUF) | |
562 | sk->sk_rcvbuf = SOCK_MIN_RCVBUF; | |
563 | else | |
564 | sk->sk_rcvbuf = val * 2; | |
565 | break; | |
566 | ||
567 | case SO_RCVBUFFORCE: | |
568 | if (!capable(CAP_NET_ADMIN)) { | |
569 | ret = -EPERM; | |
1da177e4 | 570 | break; |
e71a4783 SH |
571 | } |
572 | goto set_rcvbuf; | |
1da177e4 | 573 | |
e71a4783 | 574 | case SO_KEEPALIVE: |
1da177e4 | 575 | #ifdef CONFIG_INET |
e71a4783 SH |
576 | if (sk->sk_protocol == IPPROTO_TCP) |
577 | tcp_set_keepalive(sk, valbool); | |
1da177e4 | 578 | #endif |
e71a4783 SH |
579 | sock_valbool_flag(sk, SOCK_KEEPOPEN, valbool); |
580 | break; | |
581 | ||
582 | case SO_OOBINLINE: | |
583 | sock_valbool_flag(sk, SOCK_URGINLINE, valbool); | |
584 | break; | |
585 | ||
586 | case SO_NO_CHECK: | |
587 | sk->sk_no_check = valbool; | |
588 | break; | |
589 | ||
590 | case SO_PRIORITY: | |
591 | if ((val >= 0 && val <= 6) || capable(CAP_NET_ADMIN)) | |
592 | sk->sk_priority = val; | |
593 | else | |
594 | ret = -EPERM; | |
595 | break; | |
596 | ||
597 | case SO_LINGER: | |
598 | if (optlen < sizeof(ling)) { | |
599 | ret = -EINVAL; /* 1003.1g */ | |
1da177e4 | 600 | break; |
e71a4783 | 601 | } |
2a91525c | 602 | if (copy_from_user(&ling, optval, sizeof(ling))) { |
e71a4783 | 603 | ret = -EFAULT; |
1da177e4 | 604 | break; |
e71a4783 SH |
605 | } |
606 | if (!ling.l_onoff) | |
607 | sock_reset_flag(sk, SOCK_LINGER); | |
608 | else { | |
1da177e4 | 609 | #if (BITS_PER_LONG == 32) |
e71a4783 SH |
610 | if ((unsigned int)ling.l_linger >= MAX_SCHEDULE_TIMEOUT/HZ) |
611 | sk->sk_lingertime = MAX_SCHEDULE_TIMEOUT; | |
1da177e4 | 612 | else |
e71a4783 SH |
613 | #endif |
614 | sk->sk_lingertime = (unsigned int)ling.l_linger * HZ; | |
615 | sock_set_flag(sk, SOCK_LINGER); | |
616 | } | |
617 | break; | |
618 | ||
619 | case SO_BSDCOMPAT: | |
620 | sock_warn_obsolete_bsdism("setsockopt"); | |
621 | break; | |
622 | ||
623 | case SO_PASSCRED: | |
624 | if (valbool) | |
625 | set_bit(SOCK_PASSCRED, &sock->flags); | |
626 | else | |
627 | clear_bit(SOCK_PASSCRED, &sock->flags); | |
628 | break; | |
629 | ||
630 | case SO_TIMESTAMP: | |
92f37fd2 | 631 | case SO_TIMESTAMPNS: |
e71a4783 | 632 | if (valbool) { |
92f37fd2 ED |
633 | if (optname == SO_TIMESTAMP) |
634 | sock_reset_flag(sk, SOCK_RCVTSTAMPNS); | |
635 | else | |
636 | sock_set_flag(sk, SOCK_RCVTSTAMPNS); | |
e71a4783 | 637 | sock_set_flag(sk, SOCK_RCVTSTAMP); |
20d49473 | 638 | sock_enable_timestamp(sk, SOCK_TIMESTAMP); |
92f37fd2 | 639 | } else { |
e71a4783 | 640 | sock_reset_flag(sk, SOCK_RCVTSTAMP); |
92f37fd2 ED |
641 | sock_reset_flag(sk, SOCK_RCVTSTAMPNS); |
642 | } | |
e71a4783 SH |
643 | break; |
644 | ||
20d49473 PO |
645 | case SO_TIMESTAMPING: |
646 | if (val & ~SOF_TIMESTAMPING_MASK) { | |
f249fb78 | 647 | ret = -EINVAL; |
20d49473 PO |
648 | break; |
649 | } | |
650 | sock_valbool_flag(sk, SOCK_TIMESTAMPING_TX_HARDWARE, | |
651 | val & SOF_TIMESTAMPING_TX_HARDWARE); | |
652 | sock_valbool_flag(sk, SOCK_TIMESTAMPING_TX_SOFTWARE, | |
653 | val & SOF_TIMESTAMPING_TX_SOFTWARE); | |
654 | sock_valbool_flag(sk, SOCK_TIMESTAMPING_RX_HARDWARE, | |
655 | val & SOF_TIMESTAMPING_RX_HARDWARE); | |
656 | if (val & SOF_TIMESTAMPING_RX_SOFTWARE) | |
657 | sock_enable_timestamp(sk, | |
658 | SOCK_TIMESTAMPING_RX_SOFTWARE); | |
659 | else | |
660 | sock_disable_timestamp(sk, | |
661 | SOCK_TIMESTAMPING_RX_SOFTWARE); | |
662 | sock_valbool_flag(sk, SOCK_TIMESTAMPING_SOFTWARE, | |
663 | val & SOF_TIMESTAMPING_SOFTWARE); | |
664 | sock_valbool_flag(sk, SOCK_TIMESTAMPING_SYS_HARDWARE, | |
665 | val & SOF_TIMESTAMPING_SYS_HARDWARE); | |
666 | sock_valbool_flag(sk, SOCK_TIMESTAMPING_RAW_HARDWARE, | |
667 | val & SOF_TIMESTAMPING_RAW_HARDWARE); | |
668 | break; | |
669 | ||
e71a4783 SH |
670 | case SO_RCVLOWAT: |
671 | if (val < 0) | |
672 | val = INT_MAX; | |
673 | sk->sk_rcvlowat = val ? : 1; | |
674 | break; | |
675 | ||
676 | case SO_RCVTIMEO: | |
677 | ret = sock_set_timeout(&sk->sk_rcvtimeo, optval, optlen); | |
678 | break; | |
679 | ||
680 | case SO_SNDTIMEO: | |
681 | ret = sock_set_timeout(&sk->sk_sndtimeo, optval, optlen); | |
682 | break; | |
1da177e4 | 683 | |
e71a4783 SH |
684 | case SO_ATTACH_FILTER: |
685 | ret = -EINVAL; | |
686 | if (optlen == sizeof(struct sock_fprog)) { | |
687 | struct sock_fprog fprog; | |
1da177e4 | 688 | |
e71a4783 SH |
689 | ret = -EFAULT; |
690 | if (copy_from_user(&fprog, optval, sizeof(fprog))) | |
1da177e4 | 691 | break; |
e71a4783 SH |
692 | |
693 | ret = sk_attach_filter(&fprog, sk); | |
694 | } | |
695 | break; | |
696 | ||
697 | case SO_DETACH_FILTER: | |
55b33325 | 698 | ret = sk_detach_filter(sk); |
e71a4783 | 699 | break; |
1da177e4 | 700 | |
e71a4783 SH |
701 | case SO_PASSSEC: |
702 | if (valbool) | |
703 | set_bit(SOCK_PASSSEC, &sock->flags); | |
704 | else | |
705 | clear_bit(SOCK_PASSSEC, &sock->flags); | |
706 | break; | |
4a19ec58 LAT |
707 | case SO_MARK: |
708 | if (!capable(CAP_NET_ADMIN)) | |
709 | ret = -EPERM; | |
2a91525c | 710 | else |
4a19ec58 | 711 | sk->sk_mark = val; |
4a19ec58 | 712 | break; |
877ce7c1 | 713 | |
1da177e4 LT |
714 | /* We implement the SO_SNDLOWAT etc to |
715 | not be settable (1003.1g 5.3) */ | |
3b885787 NH |
716 | case SO_RXQ_OVFL: |
717 | if (valbool) | |
718 | sock_set_flag(sk, SOCK_RXQ_OVFL); | |
719 | else | |
720 | sock_reset_flag(sk, SOCK_RXQ_OVFL); | |
721 | break; | |
e71a4783 SH |
722 | default: |
723 | ret = -ENOPROTOOPT; | |
724 | break; | |
4ec93edb | 725 | } |
1da177e4 LT |
726 | release_sock(sk); |
727 | return ret; | |
728 | } | |
2a91525c | 729 | EXPORT_SYMBOL(sock_setsockopt); |
1da177e4 LT |
730 | |
731 | ||
732 | int sock_getsockopt(struct socket *sock, int level, int optname, | |
733 | char __user *optval, int __user *optlen) | |
734 | { | |
735 | struct sock *sk = sock->sk; | |
4ec93edb | 736 | |
e71a4783 | 737 | union { |
4ec93edb YH |
738 | int val; |
739 | struct linger ling; | |
1da177e4 LT |
740 | struct timeval tm; |
741 | } v; | |
4ec93edb | 742 | |
1da177e4 LT |
743 | unsigned int lv = sizeof(int); |
744 | int len; | |
4ec93edb | 745 | |
e71a4783 | 746 | if (get_user(len, optlen)) |
4ec93edb | 747 | return -EFAULT; |
e71a4783 | 748 | if (len < 0) |
1da177e4 | 749 | return -EINVAL; |
4ec93edb | 750 | |
50fee1de | 751 | memset(&v, 0, sizeof(v)); |
df0bca04 | 752 | |
2a91525c | 753 | switch (optname) { |
e71a4783 SH |
754 | case SO_DEBUG: |
755 | v.val = sock_flag(sk, SOCK_DBG); | |
756 | break; | |
757 | ||
758 | case SO_DONTROUTE: | |
759 | v.val = sock_flag(sk, SOCK_LOCALROUTE); | |
760 | break; | |
761 | ||
762 | case SO_BROADCAST: | |
763 | v.val = !!sock_flag(sk, SOCK_BROADCAST); | |
764 | break; | |
765 | ||
766 | case SO_SNDBUF: | |
767 | v.val = sk->sk_sndbuf; | |
768 | break; | |
769 | ||
770 | case SO_RCVBUF: | |
771 | v.val = sk->sk_rcvbuf; | |
772 | break; | |
773 | ||
774 | case SO_REUSEADDR: | |
775 | v.val = sk->sk_reuse; | |
776 | break; | |
777 | ||
778 | case SO_KEEPALIVE: | |
779 | v.val = !!sock_flag(sk, SOCK_KEEPOPEN); | |
780 | break; | |
781 | ||
782 | case SO_TYPE: | |
783 | v.val = sk->sk_type; | |
784 | break; | |
785 | ||
49c794e9 JE |
786 | case SO_PROTOCOL: |
787 | v.val = sk->sk_protocol; | |
788 | break; | |
789 | ||
0d6038ee JE |
790 | case SO_DOMAIN: |
791 | v.val = sk->sk_family; | |
792 | break; | |
793 | ||
e71a4783 SH |
794 | case SO_ERROR: |
795 | v.val = -sock_error(sk); | |
2a91525c | 796 | if (v.val == 0) |
e71a4783 SH |
797 | v.val = xchg(&sk->sk_err_soft, 0); |
798 | break; | |
799 | ||
800 | case SO_OOBINLINE: | |
801 | v.val = !!sock_flag(sk, SOCK_URGINLINE); | |
802 | break; | |
803 | ||
804 | case SO_NO_CHECK: | |
805 | v.val = sk->sk_no_check; | |
806 | break; | |
807 | ||
808 | case SO_PRIORITY: | |
809 | v.val = sk->sk_priority; | |
810 | break; | |
811 | ||
812 | case SO_LINGER: | |
813 | lv = sizeof(v.ling); | |
814 | v.ling.l_onoff = !!sock_flag(sk, SOCK_LINGER); | |
815 | v.ling.l_linger = sk->sk_lingertime / HZ; | |
816 | break; | |
817 | ||
818 | case SO_BSDCOMPAT: | |
819 | sock_warn_obsolete_bsdism("getsockopt"); | |
820 | break; | |
821 | ||
822 | case SO_TIMESTAMP: | |
92f37fd2 ED |
823 | v.val = sock_flag(sk, SOCK_RCVTSTAMP) && |
824 | !sock_flag(sk, SOCK_RCVTSTAMPNS); | |
825 | break; | |
826 | ||
827 | case SO_TIMESTAMPNS: | |
828 | v.val = sock_flag(sk, SOCK_RCVTSTAMPNS); | |
e71a4783 SH |
829 | break; |
830 | ||
20d49473 PO |
831 | case SO_TIMESTAMPING: |
832 | v.val = 0; | |
833 | if (sock_flag(sk, SOCK_TIMESTAMPING_TX_HARDWARE)) | |
834 | v.val |= SOF_TIMESTAMPING_TX_HARDWARE; | |
835 | if (sock_flag(sk, SOCK_TIMESTAMPING_TX_SOFTWARE)) | |
836 | v.val |= SOF_TIMESTAMPING_TX_SOFTWARE; | |
837 | if (sock_flag(sk, SOCK_TIMESTAMPING_RX_HARDWARE)) | |
838 | v.val |= SOF_TIMESTAMPING_RX_HARDWARE; | |
839 | if (sock_flag(sk, SOCK_TIMESTAMPING_RX_SOFTWARE)) | |
840 | v.val |= SOF_TIMESTAMPING_RX_SOFTWARE; | |
841 | if (sock_flag(sk, SOCK_TIMESTAMPING_SOFTWARE)) | |
842 | v.val |= SOF_TIMESTAMPING_SOFTWARE; | |
843 | if (sock_flag(sk, SOCK_TIMESTAMPING_SYS_HARDWARE)) | |
844 | v.val |= SOF_TIMESTAMPING_SYS_HARDWARE; | |
845 | if (sock_flag(sk, SOCK_TIMESTAMPING_RAW_HARDWARE)) | |
846 | v.val |= SOF_TIMESTAMPING_RAW_HARDWARE; | |
847 | break; | |
848 | ||
e71a4783 | 849 | case SO_RCVTIMEO: |
2a91525c | 850 | lv = sizeof(struct timeval); |
e71a4783 SH |
851 | if (sk->sk_rcvtimeo == MAX_SCHEDULE_TIMEOUT) { |
852 | v.tm.tv_sec = 0; | |
853 | v.tm.tv_usec = 0; | |
854 | } else { | |
855 | v.tm.tv_sec = sk->sk_rcvtimeo / HZ; | |
856 | v.tm.tv_usec = ((sk->sk_rcvtimeo % HZ) * 1000000) / HZ; | |
857 | } | |
858 | break; | |
859 | ||
860 | case SO_SNDTIMEO: | |
2a91525c | 861 | lv = sizeof(struct timeval); |
e71a4783 SH |
862 | if (sk->sk_sndtimeo == MAX_SCHEDULE_TIMEOUT) { |
863 | v.tm.tv_sec = 0; | |
864 | v.tm.tv_usec = 0; | |
865 | } else { | |
866 | v.tm.tv_sec = sk->sk_sndtimeo / HZ; | |
867 | v.tm.tv_usec = ((sk->sk_sndtimeo % HZ) * 1000000) / HZ; | |
868 | } | |
869 | break; | |
1da177e4 | 870 | |
e71a4783 SH |
871 | case SO_RCVLOWAT: |
872 | v.val = sk->sk_rcvlowat; | |
873 | break; | |
1da177e4 | 874 | |
e71a4783 | 875 | case SO_SNDLOWAT: |
2a91525c | 876 | v.val = 1; |
e71a4783 | 877 | break; |
1da177e4 | 878 | |
e71a4783 SH |
879 | case SO_PASSCRED: |
880 | v.val = test_bit(SOCK_PASSCRED, &sock->flags) ? 1 : 0; | |
881 | break; | |
1da177e4 | 882 | |
e71a4783 SH |
883 | case SO_PEERCRED: |
884 | if (len > sizeof(sk->sk_peercred)) | |
885 | len = sizeof(sk->sk_peercred); | |
886 | if (copy_to_user(optval, &sk->sk_peercred, len)) | |
887 | return -EFAULT; | |
888 | goto lenout; | |
1da177e4 | 889 | |
e71a4783 SH |
890 | case SO_PEERNAME: |
891 | { | |
892 | char address[128]; | |
893 | ||
894 | if (sock->ops->getname(sock, (struct sockaddr *)address, &lv, 2)) | |
895 | return -ENOTCONN; | |
896 | if (lv < len) | |
897 | return -EINVAL; | |
898 | if (copy_to_user(optval, address, len)) | |
899 | return -EFAULT; | |
900 | goto lenout; | |
901 | } | |
1da177e4 | 902 | |
e71a4783 SH |
903 | /* Dubious BSD thing... Probably nobody even uses it, but |
904 | * the UNIX standard wants it for whatever reason... -DaveM | |
905 | */ | |
906 | case SO_ACCEPTCONN: | |
907 | v.val = sk->sk_state == TCP_LISTEN; | |
908 | break; | |
1da177e4 | 909 | |
e71a4783 SH |
910 | case SO_PASSSEC: |
911 | v.val = test_bit(SOCK_PASSSEC, &sock->flags) ? 1 : 0; | |
912 | break; | |
877ce7c1 | 913 | |
e71a4783 SH |
914 | case SO_PEERSEC: |
915 | return security_socket_getpeersec_stream(sock, optval, optlen, len); | |
1da177e4 | 916 | |
4a19ec58 LAT |
917 | case SO_MARK: |
918 | v.val = sk->sk_mark; | |
919 | break; | |
920 | ||
3b885787 NH |
921 | case SO_RXQ_OVFL: |
922 | v.val = !!sock_flag(sk, SOCK_RXQ_OVFL); | |
923 | break; | |
924 | ||
e71a4783 SH |
925 | default: |
926 | return -ENOPROTOOPT; | |
1da177e4 | 927 | } |
e71a4783 | 928 | |
1da177e4 LT |
929 | if (len > lv) |
930 | len = lv; | |
931 | if (copy_to_user(optval, &v, len)) | |
932 | return -EFAULT; | |
933 | lenout: | |
4ec93edb YH |
934 | if (put_user(len, optlen)) |
935 | return -EFAULT; | |
936 | return 0; | |
1da177e4 LT |
937 | } |
938 | ||
a5b5bb9a IM |
939 | /* |
940 | * Initialize an sk_lock. | |
941 | * | |
942 | * (We also register the sk_lock with the lock validator.) | |
943 | */ | |
b6f99a21 | 944 | static inline void sock_lock_init(struct sock *sk) |
a5b5bb9a | 945 | { |
ed07536e PZ |
946 | sock_lock_init_class_and_name(sk, |
947 | af_family_slock_key_strings[sk->sk_family], | |
948 | af_family_slock_keys + sk->sk_family, | |
949 | af_family_key_strings[sk->sk_family], | |
950 | af_family_keys + sk->sk_family); | |
a5b5bb9a IM |
951 | } |
952 | ||
4dc6dc71 ED |
953 | /* |
954 | * Copy all fields from osk to nsk but nsk->sk_refcnt must not change yet, | |
955 | * even temporarly, because of RCU lookups. sk_node should also be left as is. | |
956 | */ | |
f1a6c4da PE |
957 | static void sock_copy(struct sock *nsk, const struct sock *osk) |
958 | { | |
959 | #ifdef CONFIG_SECURITY_NETWORK | |
960 | void *sptr = nsk->sk_security; | |
961 | #endif | |
4dc6dc71 | 962 | BUILD_BUG_ON(offsetof(struct sock, sk_copy_start) != |
e022f0b4 KK |
963 | sizeof(osk->sk_node) + sizeof(osk->sk_refcnt) + |
964 | sizeof(osk->sk_tx_queue_mapping)); | |
4dc6dc71 ED |
965 | memcpy(&nsk->sk_copy_start, &osk->sk_copy_start, |
966 | osk->sk_prot->obj_size - offsetof(struct sock, sk_copy_start)); | |
f1a6c4da PE |
967 | #ifdef CONFIG_SECURITY_NETWORK |
968 | nsk->sk_security = sptr; | |
969 | security_sk_clone(osk, nsk); | |
970 | #endif | |
971 | } | |
972 | ||
2e4afe7b PE |
973 | static struct sock *sk_prot_alloc(struct proto *prot, gfp_t priority, |
974 | int family) | |
c308c1b2 PE |
975 | { |
976 | struct sock *sk; | |
977 | struct kmem_cache *slab; | |
978 | ||
979 | slab = prot->slab; | |
e912b114 ED |
980 | if (slab != NULL) { |
981 | sk = kmem_cache_alloc(slab, priority & ~__GFP_ZERO); | |
982 | if (!sk) | |
983 | return sk; | |
984 | if (priority & __GFP_ZERO) { | |
985 | /* | |
986 | * caches using SLAB_DESTROY_BY_RCU should let | |
987 | * sk_node.next un-modified. Special care is taken | |
988 | * when initializing object to zero. | |
989 | */ | |
990 | if (offsetof(struct sock, sk_node.next) != 0) | |
991 | memset(sk, 0, offsetof(struct sock, sk_node.next)); | |
992 | memset(&sk->sk_node.pprev, 0, | |
993 | prot->obj_size - offsetof(struct sock, | |
994 | sk_node.pprev)); | |
995 | } | |
996 | } | |
c308c1b2 PE |
997 | else |
998 | sk = kmalloc(prot->obj_size, priority); | |
999 | ||
2e4afe7b | 1000 | if (sk != NULL) { |
a98b65a3 VN |
1001 | kmemcheck_annotate_bitfield(sk, flags); |
1002 | ||
2e4afe7b PE |
1003 | if (security_sk_alloc(sk, family, priority)) |
1004 | goto out_free; | |
1005 | ||
1006 | if (!try_module_get(prot->owner)) | |
1007 | goto out_free_sec; | |
e022f0b4 | 1008 | sk_tx_queue_clear(sk); |
2e4afe7b PE |
1009 | } |
1010 | ||
c308c1b2 | 1011 | return sk; |
2e4afe7b PE |
1012 | |
1013 | out_free_sec: | |
1014 | security_sk_free(sk); | |
1015 | out_free: | |
1016 | if (slab != NULL) | |
1017 | kmem_cache_free(slab, sk); | |
1018 | else | |
1019 | kfree(sk); | |
1020 | return NULL; | |
c308c1b2 PE |
1021 | } |
1022 | ||
1023 | static void sk_prot_free(struct proto *prot, struct sock *sk) | |
1024 | { | |
1025 | struct kmem_cache *slab; | |
2e4afe7b | 1026 | struct module *owner; |
c308c1b2 | 1027 | |
2e4afe7b | 1028 | owner = prot->owner; |
c308c1b2 | 1029 | slab = prot->slab; |
2e4afe7b PE |
1030 | |
1031 | security_sk_free(sk); | |
c308c1b2 PE |
1032 | if (slab != NULL) |
1033 | kmem_cache_free(slab, sk); | |
1034 | else | |
1035 | kfree(sk); | |
2e4afe7b | 1036 | module_put(owner); |
c308c1b2 PE |
1037 | } |
1038 | ||
1da177e4 LT |
1039 | /** |
1040 | * sk_alloc - All socket objects are allocated here | |
c4ea43c5 | 1041 | * @net: the applicable net namespace |
4dc3b16b PP |
1042 | * @family: protocol family |
1043 | * @priority: for allocation (%GFP_KERNEL, %GFP_ATOMIC, etc) | |
1044 | * @prot: struct proto associated with this new sock instance | |
1da177e4 | 1045 | */ |
1b8d7ae4 | 1046 | struct sock *sk_alloc(struct net *net, int family, gfp_t priority, |
6257ff21 | 1047 | struct proto *prot) |
1da177e4 | 1048 | { |
c308c1b2 | 1049 | struct sock *sk; |
1da177e4 | 1050 | |
154adbc8 | 1051 | sk = sk_prot_alloc(prot, priority | __GFP_ZERO, family); |
1da177e4 | 1052 | if (sk) { |
154adbc8 PE |
1053 | sk->sk_family = family; |
1054 | /* | |
1055 | * See comment in struct sock definition to understand | |
1056 | * why we need sk_prot_creator -acme | |
1057 | */ | |
1058 | sk->sk_prot = sk->sk_prot_creator = prot; | |
1059 | sock_lock_init(sk); | |
3b1e0a65 | 1060 | sock_net_set(sk, get_net(net)); |
d66ee058 | 1061 | atomic_set(&sk->sk_wmem_alloc, 1); |
1da177e4 | 1062 | } |
a79af59e | 1063 | |
2e4afe7b | 1064 | return sk; |
1da177e4 | 1065 | } |
2a91525c | 1066 | EXPORT_SYMBOL(sk_alloc); |
1da177e4 | 1067 | |
2b85a34e | 1068 | static void __sk_free(struct sock *sk) |
1da177e4 LT |
1069 | { |
1070 | struct sk_filter *filter; | |
1da177e4 LT |
1071 | |
1072 | if (sk->sk_destruct) | |
1073 | sk->sk_destruct(sk); | |
1074 | ||
fda9ef5d | 1075 | filter = rcu_dereference(sk->sk_filter); |
1da177e4 | 1076 | if (filter) { |
309dd5fc | 1077 | sk_filter_uncharge(sk, filter); |
fda9ef5d | 1078 | rcu_assign_pointer(sk->sk_filter, NULL); |
1da177e4 LT |
1079 | } |
1080 | ||
20d49473 PO |
1081 | sock_disable_timestamp(sk, SOCK_TIMESTAMP); |
1082 | sock_disable_timestamp(sk, SOCK_TIMESTAMPING_RX_SOFTWARE); | |
1da177e4 LT |
1083 | |
1084 | if (atomic_read(&sk->sk_omem_alloc)) | |
1085 | printk(KERN_DEBUG "%s: optmem leakage (%d bytes) detected.\n", | |
0dc47877 | 1086 | __func__, atomic_read(&sk->sk_omem_alloc)); |
1da177e4 | 1087 | |
3b1e0a65 | 1088 | put_net(sock_net(sk)); |
c308c1b2 | 1089 | sk_prot_free(sk->sk_prot_creator, sk); |
1da177e4 | 1090 | } |
2b85a34e ED |
1091 | |
1092 | void sk_free(struct sock *sk) | |
1093 | { | |
1094 | /* | |
1095 | * We substract one from sk_wmem_alloc and can know if | |
1096 | * some packets are still in some tx queue. | |
1097 | * If not null, sock_wfree() will call __sk_free(sk) later | |
1098 | */ | |
1099 | if (atomic_dec_and_test(&sk->sk_wmem_alloc)) | |
1100 | __sk_free(sk); | |
1101 | } | |
2a91525c | 1102 | EXPORT_SYMBOL(sk_free); |
1da177e4 | 1103 | |
edf02087 DL |
1104 | /* |
1105 | * Last sock_put should drop referrence to sk->sk_net. It has already | |
1106 | * been dropped in sk_change_net. Taking referrence to stopping namespace | |
1107 | * is not an option. | |
1108 | * Take referrence to a socket to remove it from hash _alive_ and after that | |
1109 | * destroy it in the context of init_net. | |
1110 | */ | |
1111 | void sk_release_kernel(struct sock *sk) | |
1112 | { | |
1113 | if (sk == NULL || sk->sk_socket == NULL) | |
1114 | return; | |
1115 | ||
1116 | sock_hold(sk); | |
1117 | sock_release(sk->sk_socket); | |
65a18ec5 | 1118 | release_net(sock_net(sk)); |
3b1e0a65 | 1119 | sock_net_set(sk, get_net(&init_net)); |
edf02087 DL |
1120 | sock_put(sk); |
1121 | } | |
45af1754 | 1122 | EXPORT_SYMBOL(sk_release_kernel); |
edf02087 | 1123 | |
dd0fc66f | 1124 | struct sock *sk_clone(const struct sock *sk, const gfp_t priority) |
87d11ceb | 1125 | { |
8fd1d178 | 1126 | struct sock *newsk; |
87d11ceb | 1127 | |
8fd1d178 | 1128 | newsk = sk_prot_alloc(sk->sk_prot, priority, sk->sk_family); |
87d11ceb ACM |
1129 | if (newsk != NULL) { |
1130 | struct sk_filter *filter; | |
1131 | ||
892c141e | 1132 | sock_copy(newsk, sk); |
87d11ceb ACM |
1133 | |
1134 | /* SANITY */ | |
3b1e0a65 | 1135 | get_net(sock_net(newsk)); |
87d11ceb ACM |
1136 | sk_node_init(&newsk->sk_node); |
1137 | sock_lock_init(newsk); | |
1138 | bh_lock_sock(newsk); | |
fa438ccf | 1139 | newsk->sk_backlog.head = newsk->sk_backlog.tail = NULL; |
87d11ceb ACM |
1140 | |
1141 | atomic_set(&newsk->sk_rmem_alloc, 0); | |
2b85a34e ED |
1142 | /* |
1143 | * sk_wmem_alloc set to one (see sk_free() and sock_wfree()) | |
1144 | */ | |
1145 | atomic_set(&newsk->sk_wmem_alloc, 1); | |
87d11ceb ACM |
1146 | atomic_set(&newsk->sk_omem_alloc, 0); |
1147 | skb_queue_head_init(&newsk->sk_receive_queue); | |
1148 | skb_queue_head_init(&newsk->sk_write_queue); | |
97fc2f08 CL |
1149 | #ifdef CONFIG_NET_DMA |
1150 | skb_queue_head_init(&newsk->sk_async_wait_queue); | |
1151 | #endif | |
87d11ceb ACM |
1152 | |
1153 | rwlock_init(&newsk->sk_dst_lock); | |
1154 | rwlock_init(&newsk->sk_callback_lock); | |
443aef0e PZ |
1155 | lockdep_set_class_and_name(&newsk->sk_callback_lock, |
1156 | af_callback_keys + newsk->sk_family, | |
1157 | af_family_clock_key_strings[newsk->sk_family]); | |
87d11ceb ACM |
1158 | |
1159 | newsk->sk_dst_cache = NULL; | |
1160 | newsk->sk_wmem_queued = 0; | |
1161 | newsk->sk_forward_alloc = 0; | |
1162 | newsk->sk_send_head = NULL; | |
87d11ceb ACM |
1163 | newsk->sk_userlocks = sk->sk_userlocks & ~SOCK_BINDPORT_LOCK; |
1164 | ||
1165 | sock_reset_flag(newsk, SOCK_DONE); | |
1166 | skb_queue_head_init(&newsk->sk_error_queue); | |
1167 | ||
1168 | filter = newsk->sk_filter; | |
1169 | if (filter != NULL) | |
1170 | sk_filter_charge(newsk, filter); | |
1171 | ||
1172 | if (unlikely(xfrm_sk_clone_policy(newsk))) { | |
1173 | /* It is still raw copy of parent, so invalidate | |
1174 | * destructor and make plain sk_free() */ | |
1175 | newsk->sk_destruct = NULL; | |
1176 | sk_free(newsk); | |
1177 | newsk = NULL; | |
1178 | goto out; | |
1179 | } | |
1180 | ||
1181 | newsk->sk_err = 0; | |
1182 | newsk->sk_priority = 0; | |
4dc6dc71 ED |
1183 | /* |
1184 | * Before updating sk_refcnt, we must commit prior changes to memory | |
1185 | * (Documentation/RCU/rculist_nulls.txt for details) | |
1186 | */ | |
1187 | smp_wmb(); | |
87d11ceb ACM |
1188 | atomic_set(&newsk->sk_refcnt, 2); |
1189 | ||
1190 | /* | |
1191 | * Increment the counter in the same struct proto as the master | |
1192 | * sock (sk_refcnt_debug_inc uses newsk->sk_prot->socks, that | |
1193 | * is the same as sk->sk_prot->socks, as this field was copied | |
1194 | * with memcpy). | |
1195 | * | |
1196 | * This _changes_ the previous behaviour, where | |
1197 | * tcp_create_openreq_child always was incrementing the | |
1198 | * equivalent to tcp_prot->socks (inet_sock_nr), so this have | |
1199 | * to be taken into account in all callers. -acme | |
1200 | */ | |
1201 | sk_refcnt_debug_inc(newsk); | |
972692e0 | 1202 | sk_set_socket(newsk, NULL); |
87d11ceb ACM |
1203 | newsk->sk_sleep = NULL; |
1204 | ||
1205 | if (newsk->sk_prot->sockets_allocated) | |
1748376b | 1206 | percpu_counter_inc(newsk->sk_prot->sockets_allocated); |
87d11ceb ACM |
1207 | } |
1208 | out: | |
1209 | return newsk; | |
1210 | } | |
87d11ceb ACM |
1211 | EXPORT_SYMBOL_GPL(sk_clone); |
1212 | ||
9958089a AK |
1213 | void sk_setup_caps(struct sock *sk, struct dst_entry *dst) |
1214 | { | |
1215 | __sk_dst_set(sk, dst); | |
1216 | sk->sk_route_caps = dst->dev->features; | |
1217 | if (sk->sk_route_caps & NETIF_F_GSO) | |
4fcd6b99 | 1218 | sk->sk_route_caps |= NETIF_F_GSO_SOFTWARE; |
9958089a | 1219 | if (sk_can_gso(sk)) { |
82cc1a7a | 1220 | if (dst->header_len) { |
9958089a | 1221 | sk->sk_route_caps &= ~NETIF_F_GSO_MASK; |
82cc1a7a | 1222 | } else { |
9958089a | 1223 | sk->sk_route_caps |= NETIF_F_SG | NETIF_F_HW_CSUM; |
82cc1a7a PWJ |
1224 | sk->sk_gso_max_size = dst->dev->gso_max_size; |
1225 | } | |
9958089a AK |
1226 | } |
1227 | } | |
1228 | EXPORT_SYMBOL_GPL(sk_setup_caps); | |
1229 | ||
1da177e4 LT |
1230 | void __init sk_init(void) |
1231 | { | |
4481374c | 1232 | if (totalram_pages <= 4096) { |
1da177e4 LT |
1233 | sysctl_wmem_max = 32767; |
1234 | sysctl_rmem_max = 32767; | |
1235 | sysctl_wmem_default = 32767; | |
1236 | sysctl_rmem_default = 32767; | |
4481374c | 1237 | } else if (totalram_pages >= 131072) { |
1da177e4 LT |
1238 | sysctl_wmem_max = 131071; |
1239 | sysctl_rmem_max = 131071; | |
1240 | } | |
1241 | } | |
1242 | ||
1243 | /* | |
1244 | * Simple resource managers for sockets. | |
1245 | */ | |
1246 | ||
1247 | ||
4ec93edb YH |
1248 | /* |
1249 | * Write buffer destructor automatically called from kfree_skb. | |
1da177e4 LT |
1250 | */ |
1251 | void sock_wfree(struct sk_buff *skb) | |
1252 | { | |
1253 | struct sock *sk = skb->sk; | |
d99927f4 | 1254 | unsigned int len = skb->truesize; |
1da177e4 | 1255 | |
d99927f4 ED |
1256 | if (!sock_flag(sk, SOCK_USE_WRITE_QUEUE)) { |
1257 | /* | |
1258 | * Keep a reference on sk_wmem_alloc, this will be released | |
1259 | * after sk_write_space() call | |
1260 | */ | |
1261 | atomic_sub(len - 1, &sk->sk_wmem_alloc); | |
1da177e4 | 1262 | sk->sk_write_space(sk); |
d99927f4 ED |
1263 | len = 1; |
1264 | } | |
2b85a34e | 1265 | /* |
d99927f4 ED |
1266 | * if sk_wmem_alloc reaches 0, we must finish what sk_free() |
1267 | * could not do because of in-flight packets | |
2b85a34e | 1268 | */ |
d99927f4 | 1269 | if (atomic_sub_and_test(len, &sk->sk_wmem_alloc)) |
2b85a34e | 1270 | __sk_free(sk); |
1da177e4 | 1271 | } |
2a91525c | 1272 | EXPORT_SYMBOL(sock_wfree); |
1da177e4 | 1273 | |
4ec93edb YH |
1274 | /* |
1275 | * Read buffer destructor automatically called from kfree_skb. | |
1da177e4 LT |
1276 | */ |
1277 | void sock_rfree(struct sk_buff *skb) | |
1278 | { | |
1279 | struct sock *sk = skb->sk; | |
1280 | ||
1281 | atomic_sub(skb->truesize, &sk->sk_rmem_alloc); | |
3ab224be | 1282 | sk_mem_uncharge(skb->sk, skb->truesize); |
1da177e4 | 1283 | } |
2a91525c | 1284 | EXPORT_SYMBOL(sock_rfree); |
1da177e4 LT |
1285 | |
1286 | ||
1287 | int sock_i_uid(struct sock *sk) | |
1288 | { | |
1289 | int uid; | |
1290 | ||
1291 | read_lock(&sk->sk_callback_lock); | |
1292 | uid = sk->sk_socket ? SOCK_INODE(sk->sk_socket)->i_uid : 0; | |
1293 | read_unlock(&sk->sk_callback_lock); | |
1294 | return uid; | |
1295 | } | |
2a91525c | 1296 | EXPORT_SYMBOL(sock_i_uid); |
1da177e4 LT |
1297 | |
1298 | unsigned long sock_i_ino(struct sock *sk) | |
1299 | { | |
1300 | unsigned long ino; | |
1301 | ||
1302 | read_lock(&sk->sk_callback_lock); | |
1303 | ino = sk->sk_socket ? SOCK_INODE(sk->sk_socket)->i_ino : 0; | |
1304 | read_unlock(&sk->sk_callback_lock); | |
1305 | return ino; | |
1306 | } | |
2a91525c | 1307 | EXPORT_SYMBOL(sock_i_ino); |
1da177e4 LT |
1308 | |
1309 | /* | |
1310 | * Allocate a skb from the socket's send buffer. | |
1311 | */ | |
86a76caf | 1312 | struct sk_buff *sock_wmalloc(struct sock *sk, unsigned long size, int force, |
dd0fc66f | 1313 | gfp_t priority) |
1da177e4 LT |
1314 | { |
1315 | if (force || atomic_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf) { | |
2a91525c | 1316 | struct sk_buff *skb = alloc_skb(size, priority); |
1da177e4 LT |
1317 | if (skb) { |
1318 | skb_set_owner_w(skb, sk); | |
1319 | return skb; | |
1320 | } | |
1321 | } | |
1322 | return NULL; | |
1323 | } | |
2a91525c | 1324 | EXPORT_SYMBOL(sock_wmalloc); |
1da177e4 LT |
1325 | |
1326 | /* | |
1327 | * Allocate a skb from the socket's receive buffer. | |
4ec93edb | 1328 | */ |
86a76caf | 1329 | struct sk_buff *sock_rmalloc(struct sock *sk, unsigned long size, int force, |
dd0fc66f | 1330 | gfp_t priority) |
1da177e4 LT |
1331 | { |
1332 | if (force || atomic_read(&sk->sk_rmem_alloc) < sk->sk_rcvbuf) { | |
1333 | struct sk_buff *skb = alloc_skb(size, priority); | |
1334 | if (skb) { | |
1335 | skb_set_owner_r(skb, sk); | |
1336 | return skb; | |
1337 | } | |
1338 | } | |
1339 | return NULL; | |
1340 | } | |
1341 | ||
4ec93edb | 1342 | /* |
1da177e4 | 1343 | * Allocate a memory block from the socket's option memory buffer. |
4ec93edb | 1344 | */ |
dd0fc66f | 1345 | void *sock_kmalloc(struct sock *sk, int size, gfp_t priority) |
1da177e4 LT |
1346 | { |
1347 | if ((unsigned)size <= sysctl_optmem_max && | |
1348 | atomic_read(&sk->sk_omem_alloc) + size < sysctl_optmem_max) { | |
1349 | void *mem; | |
1350 | /* First do the add, to avoid the race if kmalloc | |
4ec93edb | 1351 | * might sleep. |
1da177e4 LT |
1352 | */ |
1353 | atomic_add(size, &sk->sk_omem_alloc); | |
1354 | mem = kmalloc(size, priority); | |
1355 | if (mem) | |
1356 | return mem; | |
1357 | atomic_sub(size, &sk->sk_omem_alloc); | |
1358 | } | |
1359 | return NULL; | |
1360 | } | |
2a91525c | 1361 | EXPORT_SYMBOL(sock_kmalloc); |
1da177e4 LT |
1362 | |
1363 | /* | |
1364 | * Free an option memory block. | |
1365 | */ | |
1366 | void sock_kfree_s(struct sock *sk, void *mem, int size) | |
1367 | { | |
1368 | kfree(mem); | |
1369 | atomic_sub(size, &sk->sk_omem_alloc); | |
1370 | } | |
2a91525c | 1371 | EXPORT_SYMBOL(sock_kfree_s); |
1da177e4 LT |
1372 | |
1373 | /* It is almost wait_for_tcp_memory minus release_sock/lock_sock. | |
1374 | I think, these locks should be removed for datagram sockets. | |
1375 | */ | |
2a91525c | 1376 | static long sock_wait_for_wmem(struct sock *sk, long timeo) |
1da177e4 LT |
1377 | { |
1378 | DEFINE_WAIT(wait); | |
1379 | ||
1380 | clear_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags); | |
1381 | for (;;) { | |
1382 | if (!timeo) | |
1383 | break; | |
1384 | if (signal_pending(current)) | |
1385 | break; | |
1386 | set_bit(SOCK_NOSPACE, &sk->sk_socket->flags); | |
1387 | prepare_to_wait(sk->sk_sleep, &wait, TASK_INTERRUPTIBLE); | |
1388 | if (atomic_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf) | |
1389 | break; | |
1390 | if (sk->sk_shutdown & SEND_SHUTDOWN) | |
1391 | break; | |
1392 | if (sk->sk_err) | |
1393 | break; | |
1394 | timeo = schedule_timeout(timeo); | |
1395 | } | |
1396 | finish_wait(sk->sk_sleep, &wait); | |
1397 | return timeo; | |
1398 | } | |
1399 | ||
1400 | ||
1401 | /* | |
1402 | * Generic send/receive buffer handlers | |
1403 | */ | |
1404 | ||
4cc7f68d HX |
1405 | struct sk_buff *sock_alloc_send_pskb(struct sock *sk, unsigned long header_len, |
1406 | unsigned long data_len, int noblock, | |
1407 | int *errcode) | |
1da177e4 LT |
1408 | { |
1409 | struct sk_buff *skb; | |
7d877f3b | 1410 | gfp_t gfp_mask; |
1da177e4 LT |
1411 | long timeo; |
1412 | int err; | |
1413 | ||
1414 | gfp_mask = sk->sk_allocation; | |
1415 | if (gfp_mask & __GFP_WAIT) | |
1416 | gfp_mask |= __GFP_REPEAT; | |
1417 | ||
1418 | timeo = sock_sndtimeo(sk, noblock); | |
1419 | while (1) { | |
1420 | err = sock_error(sk); | |
1421 | if (err != 0) | |
1422 | goto failure; | |
1423 | ||
1424 | err = -EPIPE; | |
1425 | if (sk->sk_shutdown & SEND_SHUTDOWN) | |
1426 | goto failure; | |
1427 | ||
1428 | if (atomic_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf) { | |
db38c179 | 1429 | skb = alloc_skb(header_len, gfp_mask); |
1da177e4 LT |
1430 | if (skb) { |
1431 | int npages; | |
1432 | int i; | |
1433 | ||
1434 | /* No pages, we're done... */ | |
1435 | if (!data_len) | |
1436 | break; | |
1437 | ||
1438 | npages = (data_len + (PAGE_SIZE - 1)) >> PAGE_SHIFT; | |
1439 | skb->truesize += data_len; | |
1440 | skb_shinfo(skb)->nr_frags = npages; | |
1441 | for (i = 0; i < npages; i++) { | |
1442 | struct page *page; | |
1443 | skb_frag_t *frag; | |
1444 | ||
1445 | page = alloc_pages(sk->sk_allocation, 0); | |
1446 | if (!page) { | |
1447 | err = -ENOBUFS; | |
1448 | skb_shinfo(skb)->nr_frags = i; | |
1449 | kfree_skb(skb); | |
1450 | goto failure; | |
1451 | } | |
1452 | ||
1453 | frag = &skb_shinfo(skb)->frags[i]; | |
1454 | frag->page = page; | |
1455 | frag->page_offset = 0; | |
1456 | frag->size = (data_len >= PAGE_SIZE ? | |
1457 | PAGE_SIZE : | |
1458 | data_len); | |
1459 | data_len -= PAGE_SIZE; | |
1460 | } | |
1461 | ||
1462 | /* Full success... */ | |
1463 | break; | |
1464 | } | |
1465 | err = -ENOBUFS; | |
1466 | goto failure; | |
1467 | } | |
1468 | set_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags); | |
1469 | set_bit(SOCK_NOSPACE, &sk->sk_socket->flags); | |
1470 | err = -EAGAIN; | |
1471 | if (!timeo) | |
1472 | goto failure; | |
1473 | if (signal_pending(current)) | |
1474 | goto interrupted; | |
1475 | timeo = sock_wait_for_wmem(sk, timeo); | |
1476 | } | |
1477 | ||
1478 | skb_set_owner_w(skb, sk); | |
1479 | return skb; | |
1480 | ||
1481 | interrupted: | |
1482 | err = sock_intr_errno(timeo); | |
1483 | failure: | |
1484 | *errcode = err; | |
1485 | return NULL; | |
1486 | } | |
4cc7f68d | 1487 | EXPORT_SYMBOL(sock_alloc_send_pskb); |
1da177e4 | 1488 | |
4ec93edb | 1489 | struct sk_buff *sock_alloc_send_skb(struct sock *sk, unsigned long size, |
1da177e4 LT |
1490 | int noblock, int *errcode) |
1491 | { | |
1492 | return sock_alloc_send_pskb(sk, size, 0, noblock, errcode); | |
1493 | } | |
2a91525c | 1494 | EXPORT_SYMBOL(sock_alloc_send_skb); |
1da177e4 LT |
1495 | |
1496 | static void __lock_sock(struct sock *sk) | |
1497 | { | |
1498 | DEFINE_WAIT(wait); | |
1499 | ||
e71a4783 | 1500 | for (;;) { |
1da177e4 LT |
1501 | prepare_to_wait_exclusive(&sk->sk_lock.wq, &wait, |
1502 | TASK_UNINTERRUPTIBLE); | |
1503 | spin_unlock_bh(&sk->sk_lock.slock); | |
1504 | schedule(); | |
1505 | spin_lock_bh(&sk->sk_lock.slock); | |
e71a4783 | 1506 | if (!sock_owned_by_user(sk)) |
1da177e4 LT |
1507 | break; |
1508 | } | |
1509 | finish_wait(&sk->sk_lock.wq, &wait); | |
1510 | } | |
1511 | ||
1512 | static void __release_sock(struct sock *sk) | |
1513 | { | |
1514 | struct sk_buff *skb = sk->sk_backlog.head; | |
1515 | ||
1516 | do { | |
1517 | sk->sk_backlog.head = sk->sk_backlog.tail = NULL; | |
1518 | bh_unlock_sock(sk); | |
1519 | ||
1520 | do { | |
1521 | struct sk_buff *next = skb->next; | |
1522 | ||
1523 | skb->next = NULL; | |
c57943a1 | 1524 | sk_backlog_rcv(sk, skb); |
1da177e4 LT |
1525 | |
1526 | /* | |
1527 | * We are in process context here with softirqs | |
1528 | * disabled, use cond_resched_softirq() to preempt. | |
1529 | * This is safe to do because we've taken the backlog | |
1530 | * queue private: | |
1531 | */ | |
1532 | cond_resched_softirq(); | |
1533 | ||
1534 | skb = next; | |
1535 | } while (skb != NULL); | |
1536 | ||
1537 | bh_lock_sock(sk); | |
e71a4783 | 1538 | } while ((skb = sk->sk_backlog.head) != NULL); |
1da177e4 LT |
1539 | } |
1540 | ||
1541 | /** | |
1542 | * sk_wait_data - wait for data to arrive at sk_receive_queue | |
4dc3b16b PP |
1543 | * @sk: sock to wait on |
1544 | * @timeo: for how long | |
1da177e4 LT |
1545 | * |
1546 | * Now socket state including sk->sk_err is changed only under lock, | |
1547 | * hence we may omit checks after joining wait queue. | |
1548 | * We check receive queue before schedule() only as optimization; | |
1549 | * it is very likely that release_sock() added new data. | |
1550 | */ | |
1551 | int sk_wait_data(struct sock *sk, long *timeo) | |
1552 | { | |
1553 | int rc; | |
1554 | DEFINE_WAIT(wait); | |
1555 | ||
1556 | prepare_to_wait(sk->sk_sleep, &wait, TASK_INTERRUPTIBLE); | |
1557 | set_bit(SOCK_ASYNC_WAITDATA, &sk->sk_socket->flags); | |
1558 | rc = sk_wait_event(sk, timeo, !skb_queue_empty(&sk->sk_receive_queue)); | |
1559 | clear_bit(SOCK_ASYNC_WAITDATA, &sk->sk_socket->flags); | |
1560 | finish_wait(sk->sk_sleep, &wait); | |
1561 | return rc; | |
1562 | } | |
1da177e4 LT |
1563 | EXPORT_SYMBOL(sk_wait_data); |
1564 | ||
3ab224be HA |
1565 | /** |
1566 | * __sk_mem_schedule - increase sk_forward_alloc and memory_allocated | |
1567 | * @sk: socket | |
1568 | * @size: memory size to allocate | |
1569 | * @kind: allocation type | |
1570 | * | |
1571 | * If kind is SK_MEM_SEND, it means wmem allocation. Otherwise it means | |
1572 | * rmem allocation. This function assumes that protocols which have | |
1573 | * memory_pressure use sk_wmem_queued as write buffer accounting. | |
1574 | */ | |
1575 | int __sk_mem_schedule(struct sock *sk, int size, int kind) | |
1576 | { | |
1577 | struct proto *prot = sk->sk_prot; | |
1578 | int amt = sk_mem_pages(size); | |
1579 | int allocated; | |
1580 | ||
1581 | sk->sk_forward_alloc += amt * SK_MEM_QUANTUM; | |
1582 | allocated = atomic_add_return(amt, prot->memory_allocated); | |
1583 | ||
1584 | /* Under limit. */ | |
1585 | if (allocated <= prot->sysctl_mem[0]) { | |
1586 | if (prot->memory_pressure && *prot->memory_pressure) | |
1587 | *prot->memory_pressure = 0; | |
1588 | return 1; | |
1589 | } | |
1590 | ||
1591 | /* Under pressure. */ | |
1592 | if (allocated > prot->sysctl_mem[1]) | |
1593 | if (prot->enter_memory_pressure) | |
5c52ba17 | 1594 | prot->enter_memory_pressure(sk); |
3ab224be HA |
1595 | |
1596 | /* Over hard limit. */ | |
1597 | if (allocated > prot->sysctl_mem[2]) | |
1598 | goto suppress_allocation; | |
1599 | ||
1600 | /* guarantee minimum buffer size under pressure */ | |
1601 | if (kind == SK_MEM_RECV) { | |
1602 | if (atomic_read(&sk->sk_rmem_alloc) < prot->sysctl_rmem[0]) | |
1603 | return 1; | |
1604 | } else { /* SK_MEM_SEND */ | |
1605 | if (sk->sk_type == SOCK_STREAM) { | |
1606 | if (sk->sk_wmem_queued < prot->sysctl_wmem[0]) | |
1607 | return 1; | |
1608 | } else if (atomic_read(&sk->sk_wmem_alloc) < | |
1609 | prot->sysctl_wmem[0]) | |
1610 | return 1; | |
1611 | } | |
1612 | ||
1613 | if (prot->memory_pressure) { | |
1748376b ED |
1614 | int alloc; |
1615 | ||
1616 | if (!*prot->memory_pressure) | |
1617 | return 1; | |
1618 | alloc = percpu_counter_read_positive(prot->sockets_allocated); | |
1619 | if (prot->sysctl_mem[2] > alloc * | |
3ab224be HA |
1620 | sk_mem_pages(sk->sk_wmem_queued + |
1621 | atomic_read(&sk->sk_rmem_alloc) + | |
1622 | sk->sk_forward_alloc)) | |
1623 | return 1; | |
1624 | } | |
1625 | ||
1626 | suppress_allocation: | |
1627 | ||
1628 | if (kind == SK_MEM_SEND && sk->sk_type == SOCK_STREAM) { | |
1629 | sk_stream_moderate_sndbuf(sk); | |
1630 | ||
1631 | /* Fail only if socket is _under_ its sndbuf. | |
1632 | * In this case we cannot block, so that we have to fail. | |
1633 | */ | |
1634 | if (sk->sk_wmem_queued + size >= sk->sk_sndbuf) | |
1635 | return 1; | |
1636 | } | |
1637 | ||
1638 | /* Alas. Undo changes. */ | |
1639 | sk->sk_forward_alloc -= amt * SK_MEM_QUANTUM; | |
1640 | atomic_sub(amt, prot->memory_allocated); | |
1641 | return 0; | |
1642 | } | |
3ab224be HA |
1643 | EXPORT_SYMBOL(__sk_mem_schedule); |
1644 | ||
1645 | /** | |
1646 | * __sk_reclaim - reclaim memory_allocated | |
1647 | * @sk: socket | |
1648 | */ | |
1649 | void __sk_mem_reclaim(struct sock *sk) | |
1650 | { | |
1651 | struct proto *prot = sk->sk_prot; | |
1652 | ||
680a5a50 | 1653 | atomic_sub(sk->sk_forward_alloc >> SK_MEM_QUANTUM_SHIFT, |
3ab224be HA |
1654 | prot->memory_allocated); |
1655 | sk->sk_forward_alloc &= SK_MEM_QUANTUM - 1; | |
1656 | ||
1657 | if (prot->memory_pressure && *prot->memory_pressure && | |
1658 | (atomic_read(prot->memory_allocated) < prot->sysctl_mem[0])) | |
1659 | *prot->memory_pressure = 0; | |
1660 | } | |
3ab224be HA |
1661 | EXPORT_SYMBOL(__sk_mem_reclaim); |
1662 | ||
1663 | ||
1da177e4 LT |
1664 | /* |
1665 | * Set of default routines for initialising struct proto_ops when | |
1666 | * the protocol does not support a particular function. In certain | |
1667 | * cases where it makes no sense for a protocol to have a "do nothing" | |
1668 | * function, some default processing is provided. | |
1669 | */ | |
1670 | ||
1671 | int sock_no_bind(struct socket *sock, struct sockaddr *saddr, int len) | |
1672 | { | |
1673 | return -EOPNOTSUPP; | |
1674 | } | |
2a91525c | 1675 | EXPORT_SYMBOL(sock_no_bind); |
1da177e4 | 1676 | |
4ec93edb | 1677 | int sock_no_connect(struct socket *sock, struct sockaddr *saddr, |
1da177e4 LT |
1678 | int len, int flags) |
1679 | { | |
1680 | return -EOPNOTSUPP; | |
1681 | } | |
2a91525c | 1682 | EXPORT_SYMBOL(sock_no_connect); |
1da177e4 LT |
1683 | |
1684 | int sock_no_socketpair(struct socket *sock1, struct socket *sock2) | |
1685 | { | |
1686 | return -EOPNOTSUPP; | |
1687 | } | |
2a91525c | 1688 | EXPORT_SYMBOL(sock_no_socketpair); |
1da177e4 LT |
1689 | |
1690 | int sock_no_accept(struct socket *sock, struct socket *newsock, int flags) | |
1691 | { | |
1692 | return -EOPNOTSUPP; | |
1693 | } | |
2a91525c | 1694 | EXPORT_SYMBOL(sock_no_accept); |
1da177e4 | 1695 | |
4ec93edb | 1696 | int sock_no_getname(struct socket *sock, struct sockaddr *saddr, |
1da177e4 LT |
1697 | int *len, int peer) |
1698 | { | |
1699 | return -EOPNOTSUPP; | |
1700 | } | |
2a91525c | 1701 | EXPORT_SYMBOL(sock_no_getname); |
1da177e4 | 1702 | |
2a91525c | 1703 | unsigned int sock_no_poll(struct file *file, struct socket *sock, poll_table *pt) |
1da177e4 LT |
1704 | { |
1705 | return 0; | |
1706 | } | |
2a91525c | 1707 | EXPORT_SYMBOL(sock_no_poll); |
1da177e4 LT |
1708 | |
1709 | int sock_no_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg) | |
1710 | { | |
1711 | return -EOPNOTSUPP; | |
1712 | } | |
2a91525c | 1713 | EXPORT_SYMBOL(sock_no_ioctl); |
1da177e4 LT |
1714 | |
1715 | int sock_no_listen(struct socket *sock, int backlog) | |
1716 | { | |
1717 | return -EOPNOTSUPP; | |
1718 | } | |
2a91525c | 1719 | EXPORT_SYMBOL(sock_no_listen); |
1da177e4 LT |
1720 | |
1721 | int sock_no_shutdown(struct socket *sock, int how) | |
1722 | { | |
1723 | return -EOPNOTSUPP; | |
1724 | } | |
2a91525c | 1725 | EXPORT_SYMBOL(sock_no_shutdown); |
1da177e4 LT |
1726 | |
1727 | int sock_no_setsockopt(struct socket *sock, int level, int optname, | |
b7058842 | 1728 | char __user *optval, unsigned int optlen) |
1da177e4 LT |
1729 | { |
1730 | return -EOPNOTSUPP; | |
1731 | } | |
2a91525c | 1732 | EXPORT_SYMBOL(sock_no_setsockopt); |
1da177e4 LT |
1733 | |
1734 | int sock_no_getsockopt(struct socket *sock, int level, int optname, | |
1735 | char __user *optval, int __user *optlen) | |
1736 | { | |
1737 | return -EOPNOTSUPP; | |
1738 | } | |
2a91525c | 1739 | EXPORT_SYMBOL(sock_no_getsockopt); |
1da177e4 LT |
1740 | |
1741 | int sock_no_sendmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *m, | |
1742 | size_t len) | |
1743 | { | |
1744 | return -EOPNOTSUPP; | |
1745 | } | |
2a91525c | 1746 | EXPORT_SYMBOL(sock_no_sendmsg); |
1da177e4 LT |
1747 | |
1748 | int sock_no_recvmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *m, | |
1749 | size_t len, int flags) | |
1750 | { | |
1751 | return -EOPNOTSUPP; | |
1752 | } | |
2a91525c | 1753 | EXPORT_SYMBOL(sock_no_recvmsg); |
1da177e4 LT |
1754 | |
1755 | int sock_no_mmap(struct file *file, struct socket *sock, struct vm_area_struct *vma) | |
1756 | { | |
1757 | /* Mirror missing mmap method error code */ | |
1758 | return -ENODEV; | |
1759 | } | |
2a91525c | 1760 | EXPORT_SYMBOL(sock_no_mmap); |
1da177e4 LT |
1761 | |
1762 | ssize_t sock_no_sendpage(struct socket *sock, struct page *page, int offset, size_t size, int flags) | |
1763 | { | |
1764 | ssize_t res; | |
1765 | struct msghdr msg = {.msg_flags = flags}; | |
1766 | struct kvec iov; | |
1767 | char *kaddr = kmap(page); | |
1768 | iov.iov_base = kaddr + offset; | |
1769 | iov.iov_len = size; | |
1770 | res = kernel_sendmsg(sock, &msg, &iov, 1, size); | |
1771 | kunmap(page); | |
1772 | return res; | |
1773 | } | |
2a91525c | 1774 | EXPORT_SYMBOL(sock_no_sendpage); |
1da177e4 LT |
1775 | |
1776 | /* | |
1777 | * Default Socket Callbacks | |
1778 | */ | |
1779 | ||
1780 | static void sock_def_wakeup(struct sock *sk) | |
1781 | { | |
1782 | read_lock(&sk->sk_callback_lock); | |
a57de0b4 | 1783 | if (sk_has_sleeper(sk)) |
1da177e4 LT |
1784 | wake_up_interruptible_all(sk->sk_sleep); |
1785 | read_unlock(&sk->sk_callback_lock); | |
1786 | } | |
1787 | ||
1788 | static void sock_def_error_report(struct sock *sk) | |
1789 | { | |
1790 | read_lock(&sk->sk_callback_lock); | |
a57de0b4 | 1791 | if (sk_has_sleeper(sk)) |
37e5540b | 1792 | wake_up_interruptible_poll(sk->sk_sleep, POLLERR); |
8d8ad9d7 | 1793 | sk_wake_async(sk, SOCK_WAKE_IO, POLL_ERR); |
1da177e4 LT |
1794 | read_unlock(&sk->sk_callback_lock); |
1795 | } | |
1796 | ||
1797 | static void sock_def_readable(struct sock *sk, int len) | |
1798 | { | |
1799 | read_lock(&sk->sk_callback_lock); | |
a57de0b4 | 1800 | if (sk_has_sleeper(sk)) |
37e5540b DL |
1801 | wake_up_interruptible_sync_poll(sk->sk_sleep, POLLIN | |
1802 | POLLRDNORM | POLLRDBAND); | |
8d8ad9d7 | 1803 | sk_wake_async(sk, SOCK_WAKE_WAITD, POLL_IN); |
1da177e4 LT |
1804 | read_unlock(&sk->sk_callback_lock); |
1805 | } | |
1806 | ||
1807 | static void sock_def_write_space(struct sock *sk) | |
1808 | { | |
1809 | read_lock(&sk->sk_callback_lock); | |
1810 | ||
1811 | /* Do not wake up a writer until he can make "significant" | |
1812 | * progress. --DaveM | |
1813 | */ | |
e71a4783 | 1814 | if ((atomic_read(&sk->sk_wmem_alloc) << 1) <= sk->sk_sndbuf) { |
a57de0b4 | 1815 | if (sk_has_sleeper(sk)) |
37e5540b DL |
1816 | wake_up_interruptible_sync_poll(sk->sk_sleep, POLLOUT | |
1817 | POLLWRNORM | POLLWRBAND); | |
1da177e4 LT |
1818 | |
1819 | /* Should agree with poll, otherwise some programs break */ | |
1820 | if (sock_writeable(sk)) | |
8d8ad9d7 | 1821 | sk_wake_async(sk, SOCK_WAKE_SPACE, POLL_OUT); |
1da177e4 LT |
1822 | } |
1823 | ||
1824 | read_unlock(&sk->sk_callback_lock); | |
1825 | } | |
1826 | ||
1827 | static void sock_def_destruct(struct sock *sk) | |
1828 | { | |
a51482bd | 1829 | kfree(sk->sk_protinfo); |
1da177e4 LT |
1830 | } |
1831 | ||
1832 | void sk_send_sigurg(struct sock *sk) | |
1833 | { | |
1834 | if (sk->sk_socket && sk->sk_socket->file) | |
1835 | if (send_sigurg(&sk->sk_socket->file->f_owner)) | |
8d8ad9d7 | 1836 | sk_wake_async(sk, SOCK_WAKE_URG, POLL_PRI); |
1da177e4 | 1837 | } |
2a91525c | 1838 | EXPORT_SYMBOL(sk_send_sigurg); |
1da177e4 LT |
1839 | |
1840 | void sk_reset_timer(struct sock *sk, struct timer_list* timer, | |
1841 | unsigned long expires) | |
1842 | { | |
1843 | if (!mod_timer(timer, expires)) | |
1844 | sock_hold(sk); | |
1845 | } | |
1da177e4 LT |
1846 | EXPORT_SYMBOL(sk_reset_timer); |
1847 | ||
1848 | void sk_stop_timer(struct sock *sk, struct timer_list* timer) | |
1849 | { | |
1850 | if (timer_pending(timer) && del_timer(timer)) | |
1851 | __sock_put(sk); | |
1852 | } | |
1da177e4 LT |
1853 | EXPORT_SYMBOL(sk_stop_timer); |
1854 | ||
1855 | void sock_init_data(struct socket *sock, struct sock *sk) | |
1856 | { | |
1857 | skb_queue_head_init(&sk->sk_receive_queue); | |
1858 | skb_queue_head_init(&sk->sk_write_queue); | |
1859 | skb_queue_head_init(&sk->sk_error_queue); | |
97fc2f08 CL |
1860 | #ifdef CONFIG_NET_DMA |
1861 | skb_queue_head_init(&sk->sk_async_wait_queue); | |
1862 | #endif | |
1da177e4 LT |
1863 | |
1864 | sk->sk_send_head = NULL; | |
1865 | ||
1866 | init_timer(&sk->sk_timer); | |
4ec93edb | 1867 | |
1da177e4 LT |
1868 | sk->sk_allocation = GFP_KERNEL; |
1869 | sk->sk_rcvbuf = sysctl_rmem_default; | |
1870 | sk->sk_sndbuf = sysctl_wmem_default; | |
1871 | sk->sk_state = TCP_CLOSE; | |
972692e0 | 1872 | sk_set_socket(sk, sock); |
1da177e4 LT |
1873 | |
1874 | sock_set_flag(sk, SOCK_ZAPPED); | |
1875 | ||
e71a4783 | 1876 | if (sock) { |
1da177e4 LT |
1877 | sk->sk_type = sock->type; |
1878 | sk->sk_sleep = &sock->wait; | |
1879 | sock->sk = sk; | |
1880 | } else | |
1881 | sk->sk_sleep = NULL; | |
1882 | ||
1883 | rwlock_init(&sk->sk_dst_lock); | |
1884 | rwlock_init(&sk->sk_callback_lock); | |
443aef0e PZ |
1885 | lockdep_set_class_and_name(&sk->sk_callback_lock, |
1886 | af_callback_keys + sk->sk_family, | |
1887 | af_family_clock_key_strings[sk->sk_family]); | |
1da177e4 LT |
1888 | |
1889 | sk->sk_state_change = sock_def_wakeup; | |
1890 | sk->sk_data_ready = sock_def_readable; | |
1891 | sk->sk_write_space = sock_def_write_space; | |
1892 | sk->sk_error_report = sock_def_error_report; | |
1893 | sk->sk_destruct = sock_def_destruct; | |
1894 | ||
1895 | sk->sk_sndmsg_page = NULL; | |
1896 | sk->sk_sndmsg_off = 0; | |
1897 | ||
1898 | sk->sk_peercred.pid = 0; | |
1899 | sk->sk_peercred.uid = -1; | |
1900 | sk->sk_peercred.gid = -1; | |
1901 | sk->sk_write_pending = 0; | |
1902 | sk->sk_rcvlowat = 1; | |
1903 | sk->sk_rcvtimeo = MAX_SCHEDULE_TIMEOUT; | |
1904 | sk->sk_sndtimeo = MAX_SCHEDULE_TIMEOUT; | |
1905 | ||
f37f0afb | 1906 | sk->sk_stamp = ktime_set(-1L, 0); |
1da177e4 | 1907 | |
4dc6dc71 ED |
1908 | /* |
1909 | * Before updating sk_refcnt, we must commit prior changes to memory | |
1910 | * (Documentation/RCU/rculist_nulls.txt for details) | |
1911 | */ | |
1912 | smp_wmb(); | |
1da177e4 | 1913 | atomic_set(&sk->sk_refcnt, 1); |
33c732c3 | 1914 | atomic_set(&sk->sk_drops, 0); |
1da177e4 | 1915 | } |
2a91525c | 1916 | EXPORT_SYMBOL(sock_init_data); |
1da177e4 | 1917 | |
b5606c2d | 1918 | void lock_sock_nested(struct sock *sk, int subclass) |
1da177e4 LT |
1919 | { |
1920 | might_sleep(); | |
a5b5bb9a | 1921 | spin_lock_bh(&sk->sk_lock.slock); |
d2e9117c | 1922 | if (sk->sk_lock.owned) |
1da177e4 | 1923 | __lock_sock(sk); |
d2e9117c | 1924 | sk->sk_lock.owned = 1; |
a5b5bb9a IM |
1925 | spin_unlock(&sk->sk_lock.slock); |
1926 | /* | |
1927 | * The sk_lock has mutex_lock() semantics here: | |
1928 | */ | |
fcc70d5f | 1929 | mutex_acquire(&sk->sk_lock.dep_map, subclass, 0, _RET_IP_); |
a5b5bb9a | 1930 | local_bh_enable(); |
1da177e4 | 1931 | } |
fcc70d5f | 1932 | EXPORT_SYMBOL(lock_sock_nested); |
1da177e4 | 1933 | |
b5606c2d | 1934 | void release_sock(struct sock *sk) |
1da177e4 | 1935 | { |
a5b5bb9a IM |
1936 | /* |
1937 | * The sk_lock has mutex_unlock() semantics: | |
1938 | */ | |
1939 | mutex_release(&sk->sk_lock.dep_map, 1, _RET_IP_); | |
1940 | ||
1941 | spin_lock_bh(&sk->sk_lock.slock); | |
1da177e4 LT |
1942 | if (sk->sk_backlog.tail) |
1943 | __release_sock(sk); | |
d2e9117c | 1944 | sk->sk_lock.owned = 0; |
a5b5bb9a IM |
1945 | if (waitqueue_active(&sk->sk_lock.wq)) |
1946 | wake_up(&sk->sk_lock.wq); | |
1947 | spin_unlock_bh(&sk->sk_lock.slock); | |
1da177e4 LT |
1948 | } |
1949 | EXPORT_SYMBOL(release_sock); | |
1950 | ||
1951 | int sock_get_timestamp(struct sock *sk, struct timeval __user *userstamp) | |
4ec93edb | 1952 | { |
b7aa0bf7 | 1953 | struct timeval tv; |
1da177e4 | 1954 | if (!sock_flag(sk, SOCK_TIMESTAMP)) |
20d49473 | 1955 | sock_enable_timestamp(sk, SOCK_TIMESTAMP); |
b7aa0bf7 ED |
1956 | tv = ktime_to_timeval(sk->sk_stamp); |
1957 | if (tv.tv_sec == -1) | |
1da177e4 | 1958 | return -ENOENT; |
b7aa0bf7 ED |
1959 | if (tv.tv_sec == 0) { |
1960 | sk->sk_stamp = ktime_get_real(); | |
1961 | tv = ktime_to_timeval(sk->sk_stamp); | |
1962 | } | |
1963 | return copy_to_user(userstamp, &tv, sizeof(tv)) ? -EFAULT : 0; | |
4ec93edb | 1964 | } |
1da177e4 LT |
1965 | EXPORT_SYMBOL(sock_get_timestamp); |
1966 | ||
ae40eb1e ED |
1967 | int sock_get_timestampns(struct sock *sk, struct timespec __user *userstamp) |
1968 | { | |
1969 | struct timespec ts; | |
1970 | if (!sock_flag(sk, SOCK_TIMESTAMP)) | |
20d49473 | 1971 | sock_enable_timestamp(sk, SOCK_TIMESTAMP); |
ae40eb1e ED |
1972 | ts = ktime_to_timespec(sk->sk_stamp); |
1973 | if (ts.tv_sec == -1) | |
1974 | return -ENOENT; | |
1975 | if (ts.tv_sec == 0) { | |
1976 | sk->sk_stamp = ktime_get_real(); | |
1977 | ts = ktime_to_timespec(sk->sk_stamp); | |
1978 | } | |
1979 | return copy_to_user(userstamp, &ts, sizeof(ts)) ? -EFAULT : 0; | |
1980 | } | |
1981 | EXPORT_SYMBOL(sock_get_timestampns); | |
1982 | ||
20d49473 | 1983 | void sock_enable_timestamp(struct sock *sk, int flag) |
4ec93edb | 1984 | { |
20d49473 PO |
1985 | if (!sock_flag(sk, flag)) { |
1986 | sock_set_flag(sk, flag); | |
1987 | /* | |
1988 | * we just set one of the two flags which require net | |
1989 | * time stamping, but time stamping might have been on | |
1990 | * already because of the other one | |
1991 | */ | |
1992 | if (!sock_flag(sk, | |
1993 | flag == SOCK_TIMESTAMP ? | |
1994 | SOCK_TIMESTAMPING_RX_SOFTWARE : | |
1995 | SOCK_TIMESTAMP)) | |
1996 | net_enable_timestamp(); | |
1da177e4 LT |
1997 | } |
1998 | } | |
1da177e4 LT |
1999 | |
2000 | /* | |
2001 | * Get a socket option on an socket. | |
2002 | * | |
2003 | * FIX: POSIX 1003.1g is very ambiguous here. It states that | |
2004 | * asynchronous errors should be reported by getsockopt. We assume | |
2005 | * this means if you specify SO_ERROR (otherwise whats the point of it). | |
2006 | */ | |
2007 | int sock_common_getsockopt(struct socket *sock, int level, int optname, | |
2008 | char __user *optval, int __user *optlen) | |
2009 | { | |
2010 | struct sock *sk = sock->sk; | |
2011 | ||
2012 | return sk->sk_prot->getsockopt(sk, level, optname, optval, optlen); | |
2013 | } | |
1da177e4 LT |
2014 | EXPORT_SYMBOL(sock_common_getsockopt); |
2015 | ||
3fdadf7d | 2016 | #ifdef CONFIG_COMPAT |
543d9cfe ACM |
2017 | int compat_sock_common_getsockopt(struct socket *sock, int level, int optname, |
2018 | char __user *optval, int __user *optlen) | |
3fdadf7d DM |
2019 | { |
2020 | struct sock *sk = sock->sk; | |
2021 | ||
1e51f951 | 2022 | if (sk->sk_prot->compat_getsockopt != NULL) |
543d9cfe ACM |
2023 | return sk->sk_prot->compat_getsockopt(sk, level, optname, |
2024 | optval, optlen); | |
3fdadf7d DM |
2025 | return sk->sk_prot->getsockopt(sk, level, optname, optval, optlen); |
2026 | } | |
2027 | EXPORT_SYMBOL(compat_sock_common_getsockopt); | |
2028 | #endif | |
2029 | ||
1da177e4 LT |
2030 | int sock_common_recvmsg(struct kiocb *iocb, struct socket *sock, |
2031 | struct msghdr *msg, size_t size, int flags) | |
2032 | { | |
2033 | struct sock *sk = sock->sk; | |
2034 | int addr_len = 0; | |
2035 | int err; | |
2036 | ||
2037 | err = sk->sk_prot->recvmsg(iocb, sk, msg, size, flags & MSG_DONTWAIT, | |
2038 | flags & ~MSG_DONTWAIT, &addr_len); | |
2039 | if (err >= 0) | |
2040 | msg->msg_namelen = addr_len; | |
2041 | return err; | |
2042 | } | |
1da177e4 LT |
2043 | EXPORT_SYMBOL(sock_common_recvmsg); |
2044 | ||
2045 | /* | |
2046 | * Set socket options on an inet socket. | |
2047 | */ | |
2048 | int sock_common_setsockopt(struct socket *sock, int level, int optname, | |
b7058842 | 2049 | char __user *optval, unsigned int optlen) |
1da177e4 LT |
2050 | { |
2051 | struct sock *sk = sock->sk; | |
2052 | ||
2053 | return sk->sk_prot->setsockopt(sk, level, optname, optval, optlen); | |
2054 | } | |
1da177e4 LT |
2055 | EXPORT_SYMBOL(sock_common_setsockopt); |
2056 | ||
3fdadf7d | 2057 | #ifdef CONFIG_COMPAT |
543d9cfe | 2058 | int compat_sock_common_setsockopt(struct socket *sock, int level, int optname, |
b7058842 | 2059 | char __user *optval, unsigned int optlen) |
3fdadf7d DM |
2060 | { |
2061 | struct sock *sk = sock->sk; | |
2062 | ||
543d9cfe ACM |
2063 | if (sk->sk_prot->compat_setsockopt != NULL) |
2064 | return sk->sk_prot->compat_setsockopt(sk, level, optname, | |
2065 | optval, optlen); | |
3fdadf7d DM |
2066 | return sk->sk_prot->setsockopt(sk, level, optname, optval, optlen); |
2067 | } | |
2068 | EXPORT_SYMBOL(compat_sock_common_setsockopt); | |
2069 | #endif | |
2070 | ||
1da177e4 LT |
2071 | void sk_common_release(struct sock *sk) |
2072 | { | |
2073 | if (sk->sk_prot->destroy) | |
2074 | sk->sk_prot->destroy(sk); | |
2075 | ||
2076 | /* | |
2077 | * Observation: when sock_common_release is called, processes have | |
2078 | * no access to socket. But net still has. | |
2079 | * Step one, detach it from networking: | |
2080 | * | |
2081 | * A. Remove from hash tables. | |
2082 | */ | |
2083 | ||
2084 | sk->sk_prot->unhash(sk); | |
2085 | ||
2086 | /* | |
2087 | * In this point socket cannot receive new packets, but it is possible | |
2088 | * that some packets are in flight because some CPU runs receiver and | |
2089 | * did hash table lookup before we unhashed socket. They will achieve | |
2090 | * receive queue and will be purged by socket destructor. | |
2091 | * | |
2092 | * Also we still have packets pending on receive queue and probably, | |
2093 | * our own packets waiting in device queues. sock_destroy will drain | |
2094 | * receive queue, but transmitted packets will delay socket destruction | |
2095 | * until the last reference will be released. | |
2096 | */ | |
2097 | ||
2098 | sock_orphan(sk); | |
2099 | ||
2100 | xfrm_sk_free_policy(sk); | |
2101 | ||
e6848976 | 2102 | sk_refcnt_debug_release(sk); |
1da177e4 LT |
2103 | sock_put(sk); |
2104 | } | |
1da177e4 LT |
2105 | EXPORT_SYMBOL(sk_common_release); |
2106 | ||
2107 | static DEFINE_RWLOCK(proto_list_lock); | |
2108 | static LIST_HEAD(proto_list); | |
2109 | ||
13ff3d6f PE |
2110 | #ifdef CONFIG_PROC_FS |
2111 | #define PROTO_INUSE_NR 64 /* should be enough for the first time */ | |
1338d466 PE |
2112 | struct prot_inuse { |
2113 | int val[PROTO_INUSE_NR]; | |
2114 | }; | |
13ff3d6f PE |
2115 | |
2116 | static DECLARE_BITMAP(proto_inuse_idx, PROTO_INUSE_NR); | |
70ee1159 PE |
2117 | |
2118 | #ifdef CONFIG_NET_NS | |
2119 | void sock_prot_inuse_add(struct net *net, struct proto *prot, int val) | |
2120 | { | |
2121 | int cpu = smp_processor_id(); | |
2122 | per_cpu_ptr(net->core.inuse, cpu)->val[prot->inuse_idx] += val; | |
2123 | } | |
2124 | EXPORT_SYMBOL_GPL(sock_prot_inuse_add); | |
2125 | ||
2126 | int sock_prot_inuse_get(struct net *net, struct proto *prot) | |
2127 | { | |
2128 | int cpu, idx = prot->inuse_idx; | |
2129 | int res = 0; | |
2130 | ||
2131 | for_each_possible_cpu(cpu) | |
2132 | res += per_cpu_ptr(net->core.inuse, cpu)->val[idx]; | |
2133 | ||
2134 | return res >= 0 ? res : 0; | |
2135 | } | |
2136 | EXPORT_SYMBOL_GPL(sock_prot_inuse_get); | |
2137 | ||
2138 | static int sock_inuse_init_net(struct net *net) | |
2139 | { | |
2140 | net->core.inuse = alloc_percpu(struct prot_inuse); | |
2141 | return net->core.inuse ? 0 : -ENOMEM; | |
2142 | } | |
2143 | ||
2144 | static void sock_inuse_exit_net(struct net *net) | |
2145 | { | |
2146 | free_percpu(net->core.inuse); | |
2147 | } | |
2148 | ||
2149 | static struct pernet_operations net_inuse_ops = { | |
2150 | .init = sock_inuse_init_net, | |
2151 | .exit = sock_inuse_exit_net, | |
2152 | }; | |
2153 | ||
2154 | static __init int net_inuse_init(void) | |
2155 | { | |
2156 | if (register_pernet_subsys(&net_inuse_ops)) | |
2157 | panic("Cannot initialize net inuse counters"); | |
2158 | ||
2159 | return 0; | |
2160 | } | |
2161 | ||
2162 | core_initcall(net_inuse_init); | |
2163 | #else | |
1338d466 PE |
2164 | static DEFINE_PER_CPU(struct prot_inuse, prot_inuse); |
2165 | ||
c29a0bc4 | 2166 | void sock_prot_inuse_add(struct net *net, struct proto *prot, int val) |
1338d466 PE |
2167 | { |
2168 | __get_cpu_var(prot_inuse).val[prot->inuse_idx] += val; | |
2169 | } | |
2170 | EXPORT_SYMBOL_GPL(sock_prot_inuse_add); | |
2171 | ||
c29a0bc4 | 2172 | int sock_prot_inuse_get(struct net *net, struct proto *prot) |
1338d466 PE |
2173 | { |
2174 | int cpu, idx = prot->inuse_idx; | |
2175 | int res = 0; | |
2176 | ||
2177 | for_each_possible_cpu(cpu) | |
2178 | res += per_cpu(prot_inuse, cpu).val[idx]; | |
2179 | ||
2180 | return res >= 0 ? res : 0; | |
2181 | } | |
2182 | EXPORT_SYMBOL_GPL(sock_prot_inuse_get); | |
70ee1159 | 2183 | #endif |
13ff3d6f PE |
2184 | |
2185 | static void assign_proto_idx(struct proto *prot) | |
2186 | { | |
2187 | prot->inuse_idx = find_first_zero_bit(proto_inuse_idx, PROTO_INUSE_NR); | |
2188 | ||
2189 | if (unlikely(prot->inuse_idx == PROTO_INUSE_NR - 1)) { | |
2190 | printk(KERN_ERR "PROTO_INUSE_NR exhausted\n"); | |
2191 | return; | |
2192 | } | |
2193 | ||
2194 | set_bit(prot->inuse_idx, proto_inuse_idx); | |
2195 | } | |
2196 | ||
2197 | static void release_proto_idx(struct proto *prot) | |
2198 | { | |
2199 | if (prot->inuse_idx != PROTO_INUSE_NR - 1) | |
2200 | clear_bit(prot->inuse_idx, proto_inuse_idx); | |
2201 | } | |
2202 | #else | |
2203 | static inline void assign_proto_idx(struct proto *prot) | |
2204 | { | |
2205 | } | |
2206 | ||
2207 | static inline void release_proto_idx(struct proto *prot) | |
2208 | { | |
2209 | } | |
2210 | #endif | |
2211 | ||
b733c007 PE |
2212 | int proto_register(struct proto *prot, int alloc_slab) |
2213 | { | |
1da177e4 LT |
2214 | if (alloc_slab) { |
2215 | prot->slab = kmem_cache_create(prot->name, prot->obj_size, 0, | |
271b72c7 ED |
2216 | SLAB_HWCACHE_ALIGN | prot->slab_flags, |
2217 | NULL); | |
1da177e4 LT |
2218 | |
2219 | if (prot->slab == NULL) { | |
2220 | printk(KERN_CRIT "%s: Can't create sock SLAB cache!\n", | |
2221 | prot->name); | |
60e7663d | 2222 | goto out; |
1da177e4 | 2223 | } |
2e6599cb ACM |
2224 | |
2225 | if (prot->rsk_prot != NULL) { | |
2226 | static const char mask[] = "request_sock_%s"; | |
2227 | ||
7e56b5d6 CM |
2228 | prot->rsk_prot->slab_name = kmalloc(strlen(prot->name) + sizeof(mask) - 1, GFP_KERNEL); |
2229 | if (prot->rsk_prot->slab_name == NULL) | |
2e6599cb ACM |
2230 | goto out_free_sock_slab; |
2231 | ||
7e56b5d6 CM |
2232 | sprintf(prot->rsk_prot->slab_name, mask, prot->name); |
2233 | prot->rsk_prot->slab = kmem_cache_create(prot->rsk_prot->slab_name, | |
2e6599cb | 2234 | prot->rsk_prot->obj_size, 0, |
20c2df83 | 2235 | SLAB_HWCACHE_ALIGN, NULL); |
2e6599cb ACM |
2236 | |
2237 | if (prot->rsk_prot->slab == NULL) { | |
2238 | printk(KERN_CRIT "%s: Can't create request sock SLAB cache!\n", | |
2239 | prot->name); | |
2240 | goto out_free_request_sock_slab_name; | |
2241 | } | |
2242 | } | |
8feaf0c0 | 2243 | |
6d6ee43e | 2244 | if (prot->twsk_prot != NULL) { |
8feaf0c0 ACM |
2245 | static const char mask[] = "tw_sock_%s"; |
2246 | ||
7e56b5d6 | 2247 | prot->twsk_prot->twsk_slab_name = kmalloc(strlen(prot->name) + sizeof(mask) - 1, GFP_KERNEL); |
8feaf0c0 | 2248 | |
7e56b5d6 | 2249 | if (prot->twsk_prot->twsk_slab_name == NULL) |
8feaf0c0 ACM |
2250 | goto out_free_request_sock_slab; |
2251 | ||
7e56b5d6 | 2252 | sprintf(prot->twsk_prot->twsk_slab_name, mask, prot->name); |
6d6ee43e | 2253 | prot->twsk_prot->twsk_slab = |
7e56b5d6 | 2254 | kmem_cache_create(prot->twsk_prot->twsk_slab_name, |
6d6ee43e | 2255 | prot->twsk_prot->twsk_obj_size, |
3ab5aee7 ED |
2256 | 0, |
2257 | SLAB_HWCACHE_ALIGN | | |
2258 | prot->slab_flags, | |
20c2df83 | 2259 | NULL); |
6d6ee43e | 2260 | if (prot->twsk_prot->twsk_slab == NULL) |
8feaf0c0 ACM |
2261 | goto out_free_timewait_sock_slab_name; |
2262 | } | |
1da177e4 LT |
2263 | } |
2264 | ||
2a278051 | 2265 | write_lock(&proto_list_lock); |
1da177e4 | 2266 | list_add(&prot->node, &proto_list); |
13ff3d6f | 2267 | assign_proto_idx(prot); |
1da177e4 | 2268 | write_unlock(&proto_list_lock); |
b733c007 PE |
2269 | return 0; |
2270 | ||
8feaf0c0 | 2271 | out_free_timewait_sock_slab_name: |
7e56b5d6 | 2272 | kfree(prot->twsk_prot->twsk_slab_name); |
8feaf0c0 ACM |
2273 | out_free_request_sock_slab: |
2274 | if (prot->rsk_prot && prot->rsk_prot->slab) { | |
2275 | kmem_cache_destroy(prot->rsk_prot->slab); | |
2276 | prot->rsk_prot->slab = NULL; | |
2277 | } | |
2e6599cb | 2278 | out_free_request_sock_slab_name: |
7e56b5d6 | 2279 | kfree(prot->rsk_prot->slab_name); |
2e6599cb ACM |
2280 | out_free_sock_slab: |
2281 | kmem_cache_destroy(prot->slab); | |
2282 | prot->slab = NULL; | |
b733c007 PE |
2283 | out: |
2284 | return -ENOBUFS; | |
1da177e4 | 2285 | } |
1da177e4 LT |
2286 | EXPORT_SYMBOL(proto_register); |
2287 | ||
2288 | void proto_unregister(struct proto *prot) | |
2289 | { | |
2290 | write_lock(&proto_list_lock); | |
13ff3d6f | 2291 | release_proto_idx(prot); |
0a3f4358 PM |
2292 | list_del(&prot->node); |
2293 | write_unlock(&proto_list_lock); | |
1da177e4 LT |
2294 | |
2295 | if (prot->slab != NULL) { | |
2296 | kmem_cache_destroy(prot->slab); | |
2297 | prot->slab = NULL; | |
2298 | } | |
2299 | ||
2e6599cb | 2300 | if (prot->rsk_prot != NULL && prot->rsk_prot->slab != NULL) { |
2e6599cb | 2301 | kmem_cache_destroy(prot->rsk_prot->slab); |
7e56b5d6 | 2302 | kfree(prot->rsk_prot->slab_name); |
2e6599cb ACM |
2303 | prot->rsk_prot->slab = NULL; |
2304 | } | |
2305 | ||
6d6ee43e | 2306 | if (prot->twsk_prot != NULL && prot->twsk_prot->twsk_slab != NULL) { |
6d6ee43e | 2307 | kmem_cache_destroy(prot->twsk_prot->twsk_slab); |
7e56b5d6 | 2308 | kfree(prot->twsk_prot->twsk_slab_name); |
6d6ee43e | 2309 | prot->twsk_prot->twsk_slab = NULL; |
8feaf0c0 | 2310 | } |
1da177e4 | 2311 | } |
1da177e4 LT |
2312 | EXPORT_SYMBOL(proto_unregister); |
2313 | ||
2314 | #ifdef CONFIG_PROC_FS | |
1da177e4 | 2315 | static void *proto_seq_start(struct seq_file *seq, loff_t *pos) |
9a429c49 | 2316 | __acquires(proto_list_lock) |
1da177e4 LT |
2317 | { |
2318 | read_lock(&proto_list_lock); | |
60f0438a | 2319 | return seq_list_start_head(&proto_list, *pos); |
1da177e4 LT |
2320 | } |
2321 | ||
2322 | static void *proto_seq_next(struct seq_file *seq, void *v, loff_t *pos) | |
2323 | { | |
60f0438a | 2324 | return seq_list_next(v, &proto_list, pos); |
1da177e4 LT |
2325 | } |
2326 | ||
2327 | static void proto_seq_stop(struct seq_file *seq, void *v) | |
9a429c49 | 2328 | __releases(proto_list_lock) |
1da177e4 LT |
2329 | { |
2330 | read_unlock(&proto_list_lock); | |
2331 | } | |
2332 | ||
2333 | static char proto_method_implemented(const void *method) | |
2334 | { | |
2335 | return method == NULL ? 'n' : 'y'; | |
2336 | } | |
2337 | ||
2338 | static void proto_seq_printf(struct seq_file *seq, struct proto *proto) | |
2339 | { | |
2340 | seq_printf(seq, "%-9s %4u %6d %6d %-3s %6u %-3s %-10s " | |
2341 | "%2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c\n", | |
2342 | proto->name, | |
2343 | proto->obj_size, | |
14e943db | 2344 | sock_prot_inuse_get(seq_file_net(seq), proto), |
1da177e4 LT |
2345 | proto->memory_allocated != NULL ? atomic_read(proto->memory_allocated) : -1, |
2346 | proto->memory_pressure != NULL ? *proto->memory_pressure ? "yes" : "no" : "NI", | |
2347 | proto->max_header, | |
2348 | proto->slab == NULL ? "no" : "yes", | |
2349 | module_name(proto->owner), | |
2350 | proto_method_implemented(proto->close), | |
2351 | proto_method_implemented(proto->connect), | |
2352 | proto_method_implemented(proto->disconnect), | |
2353 | proto_method_implemented(proto->accept), | |
2354 | proto_method_implemented(proto->ioctl), | |
2355 | proto_method_implemented(proto->init), | |
2356 | proto_method_implemented(proto->destroy), | |
2357 | proto_method_implemented(proto->shutdown), | |
2358 | proto_method_implemented(proto->setsockopt), | |
2359 | proto_method_implemented(proto->getsockopt), | |
2360 | proto_method_implemented(proto->sendmsg), | |
2361 | proto_method_implemented(proto->recvmsg), | |
2362 | proto_method_implemented(proto->sendpage), | |
2363 | proto_method_implemented(proto->bind), | |
2364 | proto_method_implemented(proto->backlog_rcv), | |
2365 | proto_method_implemented(proto->hash), | |
2366 | proto_method_implemented(proto->unhash), | |
2367 | proto_method_implemented(proto->get_port), | |
2368 | proto_method_implemented(proto->enter_memory_pressure)); | |
2369 | } | |
2370 | ||
2371 | static int proto_seq_show(struct seq_file *seq, void *v) | |
2372 | { | |
60f0438a | 2373 | if (v == &proto_list) |
1da177e4 LT |
2374 | seq_printf(seq, "%-9s %-4s %-8s %-6s %-5s %-7s %-4s %-10s %s", |
2375 | "protocol", | |
2376 | "size", | |
2377 | "sockets", | |
2378 | "memory", | |
2379 | "press", | |
2380 | "maxhdr", | |
2381 | "slab", | |
2382 | "module", | |
2383 | "cl co di ac io in de sh ss gs se re sp bi br ha uh gp em\n"); | |
2384 | else | |
60f0438a | 2385 | proto_seq_printf(seq, list_entry(v, struct proto, node)); |
1da177e4 LT |
2386 | return 0; |
2387 | } | |
2388 | ||
f690808e | 2389 | static const struct seq_operations proto_seq_ops = { |
1da177e4 LT |
2390 | .start = proto_seq_start, |
2391 | .next = proto_seq_next, | |
2392 | .stop = proto_seq_stop, | |
2393 | .show = proto_seq_show, | |
2394 | }; | |
2395 | ||
2396 | static int proto_seq_open(struct inode *inode, struct file *file) | |
2397 | { | |
14e943db ED |
2398 | return seq_open_net(inode, file, &proto_seq_ops, |
2399 | sizeof(struct seq_net_private)); | |
1da177e4 LT |
2400 | } |
2401 | ||
9a32144e | 2402 | static const struct file_operations proto_seq_fops = { |
1da177e4 LT |
2403 | .owner = THIS_MODULE, |
2404 | .open = proto_seq_open, | |
2405 | .read = seq_read, | |
2406 | .llseek = seq_lseek, | |
14e943db ED |
2407 | .release = seq_release_net, |
2408 | }; | |
2409 | ||
2410 | static __net_init int proto_init_net(struct net *net) | |
2411 | { | |
2412 | if (!proc_net_fops_create(net, "protocols", S_IRUGO, &proto_seq_fops)) | |
2413 | return -ENOMEM; | |
2414 | ||
2415 | return 0; | |
2416 | } | |
2417 | ||
2418 | static __net_exit void proto_exit_net(struct net *net) | |
2419 | { | |
2420 | proc_net_remove(net, "protocols"); | |
2421 | } | |
2422 | ||
2423 | ||
2424 | static __net_initdata struct pernet_operations proto_net_ops = { | |
2425 | .init = proto_init_net, | |
2426 | .exit = proto_exit_net, | |
1da177e4 LT |
2427 | }; |
2428 | ||
2429 | static int __init proto_init(void) | |
2430 | { | |
14e943db | 2431 | return register_pernet_subsys(&proto_net_ops); |
1da177e4 LT |
2432 | } |
2433 | ||
2434 | subsys_initcall(proto_init); | |
2435 | ||
2436 | #endif /* PROC_FS */ |