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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 | ||
e005d193 JP |
92 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
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> |
3f551f94 | 115 | #include <linux/user_namespace.h> |
c5905afb | 116 | #include <linux/static_key.h> |
3969eb38 | 117 | #include <linux/memcontrol.h> |
8c1ae10d | 118 | #include <linux/prefetch.h> |
1da177e4 LT |
119 | |
120 | #include <asm/uaccess.h> | |
1da177e4 LT |
121 | |
122 | #include <linux/netdevice.h> | |
123 | #include <net/protocol.h> | |
124 | #include <linux/skbuff.h> | |
457c4cbc | 125 | #include <net/net_namespace.h> |
2e6599cb | 126 | #include <net/request_sock.h> |
1da177e4 | 127 | #include <net/sock.h> |
20d49473 | 128 | #include <linux/net_tstamp.h> |
1da177e4 LT |
129 | #include <net/xfrm.h> |
130 | #include <linux/ipsec.h> | |
f8451725 | 131 | #include <net/cls_cgroup.h> |
5bc1421e | 132 | #include <net/netprio_cgroup.h> |
1da177e4 LT |
133 | |
134 | #include <linux/filter.h> | |
135 | ||
3847ce32 SM |
136 | #include <trace/events/sock.h> |
137 | ||
1da177e4 LT |
138 | #ifdef CONFIG_INET |
139 | #include <net/tcp.h> | |
140 | #endif | |
141 | ||
36b77a52 | 142 | static DEFINE_MUTEX(proto_list_mutex); |
d1a4c0b3 GC |
143 | static LIST_HEAD(proto_list); |
144 | ||
c255a458 | 145 | #ifdef CONFIG_MEMCG_KMEM |
1d62e436 | 146 | int mem_cgroup_sockets_init(struct mem_cgroup *memcg, struct cgroup_subsys *ss) |
d1a4c0b3 GC |
147 | { |
148 | struct proto *proto; | |
149 | int ret = 0; | |
150 | ||
36b77a52 | 151 | mutex_lock(&proto_list_mutex); |
d1a4c0b3 GC |
152 | list_for_each_entry(proto, &proto_list, node) { |
153 | if (proto->init_cgroup) { | |
1d62e436 | 154 | ret = proto->init_cgroup(memcg, ss); |
d1a4c0b3 GC |
155 | if (ret) |
156 | goto out; | |
157 | } | |
158 | } | |
159 | ||
36b77a52 | 160 | mutex_unlock(&proto_list_mutex); |
d1a4c0b3 GC |
161 | return ret; |
162 | out: | |
163 | list_for_each_entry_continue_reverse(proto, &proto_list, node) | |
164 | if (proto->destroy_cgroup) | |
1d62e436 | 165 | proto->destroy_cgroup(memcg); |
36b77a52 | 166 | mutex_unlock(&proto_list_mutex); |
d1a4c0b3 GC |
167 | return ret; |
168 | } | |
169 | ||
1d62e436 | 170 | void mem_cgroup_sockets_destroy(struct mem_cgroup *memcg) |
d1a4c0b3 GC |
171 | { |
172 | struct proto *proto; | |
173 | ||
36b77a52 | 174 | mutex_lock(&proto_list_mutex); |
d1a4c0b3 GC |
175 | list_for_each_entry_reverse(proto, &proto_list, node) |
176 | if (proto->destroy_cgroup) | |
1d62e436 | 177 | proto->destroy_cgroup(memcg); |
36b77a52 | 178 | mutex_unlock(&proto_list_mutex); |
d1a4c0b3 GC |
179 | } |
180 | #endif | |
181 | ||
da21f24d IM |
182 | /* |
183 | * Each address family might have different locking rules, so we have | |
184 | * one slock key per address family: | |
185 | */ | |
a5b5bb9a IM |
186 | static struct lock_class_key af_family_keys[AF_MAX]; |
187 | static struct lock_class_key af_family_slock_keys[AF_MAX]; | |
188 | ||
c5905afb | 189 | struct static_key memcg_socket_limit_enabled; |
e1aab161 GC |
190 | EXPORT_SYMBOL(memcg_socket_limit_enabled); |
191 | ||
a5b5bb9a IM |
192 | /* |
193 | * Make lock validator output more readable. (we pre-construct these | |
194 | * strings build-time, so that runtime initialization of socket | |
195 | * locks is fast): | |
196 | */ | |
36cbd3dc | 197 | static const char *const af_family_key_strings[AF_MAX+1] = { |
a5b5bb9a IM |
198 | "sk_lock-AF_UNSPEC", "sk_lock-AF_UNIX" , "sk_lock-AF_INET" , |
199 | "sk_lock-AF_AX25" , "sk_lock-AF_IPX" , "sk_lock-AF_APPLETALK", | |
200 | "sk_lock-AF_NETROM", "sk_lock-AF_BRIDGE" , "sk_lock-AF_ATMPVC" , | |
201 | "sk_lock-AF_X25" , "sk_lock-AF_INET6" , "sk_lock-AF_ROSE" , | |
202 | "sk_lock-AF_DECnet", "sk_lock-AF_NETBEUI" , "sk_lock-AF_SECURITY" , | |
203 | "sk_lock-AF_KEY" , "sk_lock-AF_NETLINK" , "sk_lock-AF_PACKET" , | |
204 | "sk_lock-AF_ASH" , "sk_lock-AF_ECONET" , "sk_lock-AF_ATMSVC" , | |
cbd151bf | 205 | "sk_lock-AF_RDS" , "sk_lock-AF_SNA" , "sk_lock-AF_IRDA" , |
a5b5bb9a | 206 | "sk_lock-AF_PPPOX" , "sk_lock-AF_WANPIPE" , "sk_lock-AF_LLC" , |
cd05acfe | 207 | "sk_lock-27" , "sk_lock-28" , "sk_lock-AF_CAN" , |
17926a79 | 208 | "sk_lock-AF_TIPC" , "sk_lock-AF_BLUETOOTH", "sk_lock-IUCV" , |
bce7b154 | 209 | "sk_lock-AF_RXRPC" , "sk_lock-AF_ISDN" , "sk_lock-AF_PHONET" , |
6f107b58 | 210 | "sk_lock-AF_IEEE802154", "sk_lock-AF_CAIF" , "sk_lock-AF_ALG" , |
c7fe3b52 | 211 | "sk_lock-AF_NFC" , "sk_lock-AF_MAX" |
a5b5bb9a | 212 | }; |
36cbd3dc | 213 | static const char *const af_family_slock_key_strings[AF_MAX+1] = { |
a5b5bb9a IM |
214 | "slock-AF_UNSPEC", "slock-AF_UNIX" , "slock-AF_INET" , |
215 | "slock-AF_AX25" , "slock-AF_IPX" , "slock-AF_APPLETALK", | |
216 | "slock-AF_NETROM", "slock-AF_BRIDGE" , "slock-AF_ATMPVC" , | |
217 | "slock-AF_X25" , "slock-AF_INET6" , "slock-AF_ROSE" , | |
218 | "slock-AF_DECnet", "slock-AF_NETBEUI" , "slock-AF_SECURITY" , | |
219 | "slock-AF_KEY" , "slock-AF_NETLINK" , "slock-AF_PACKET" , | |
220 | "slock-AF_ASH" , "slock-AF_ECONET" , "slock-AF_ATMSVC" , | |
cbd151bf | 221 | "slock-AF_RDS" , "slock-AF_SNA" , "slock-AF_IRDA" , |
a5b5bb9a | 222 | "slock-AF_PPPOX" , "slock-AF_WANPIPE" , "slock-AF_LLC" , |
cd05acfe | 223 | "slock-27" , "slock-28" , "slock-AF_CAN" , |
17926a79 | 224 | "slock-AF_TIPC" , "slock-AF_BLUETOOTH", "slock-AF_IUCV" , |
bce7b154 | 225 | "slock-AF_RXRPC" , "slock-AF_ISDN" , "slock-AF_PHONET" , |
6f107b58 | 226 | "slock-AF_IEEE802154", "slock-AF_CAIF" , "slock-AF_ALG" , |
c7fe3b52 | 227 | "slock-AF_NFC" , "slock-AF_MAX" |
a5b5bb9a | 228 | }; |
36cbd3dc | 229 | static const char *const af_family_clock_key_strings[AF_MAX+1] = { |
443aef0e PZ |
230 | "clock-AF_UNSPEC", "clock-AF_UNIX" , "clock-AF_INET" , |
231 | "clock-AF_AX25" , "clock-AF_IPX" , "clock-AF_APPLETALK", | |
232 | "clock-AF_NETROM", "clock-AF_BRIDGE" , "clock-AF_ATMPVC" , | |
233 | "clock-AF_X25" , "clock-AF_INET6" , "clock-AF_ROSE" , | |
234 | "clock-AF_DECnet", "clock-AF_NETBEUI" , "clock-AF_SECURITY" , | |
235 | "clock-AF_KEY" , "clock-AF_NETLINK" , "clock-AF_PACKET" , | |
236 | "clock-AF_ASH" , "clock-AF_ECONET" , "clock-AF_ATMSVC" , | |
cbd151bf | 237 | "clock-AF_RDS" , "clock-AF_SNA" , "clock-AF_IRDA" , |
443aef0e | 238 | "clock-AF_PPPOX" , "clock-AF_WANPIPE" , "clock-AF_LLC" , |
b4942af6 | 239 | "clock-27" , "clock-28" , "clock-AF_CAN" , |
e51f802b | 240 | "clock-AF_TIPC" , "clock-AF_BLUETOOTH", "clock-AF_IUCV" , |
bce7b154 | 241 | "clock-AF_RXRPC" , "clock-AF_ISDN" , "clock-AF_PHONET" , |
6f107b58 | 242 | "clock-AF_IEEE802154", "clock-AF_CAIF" , "clock-AF_ALG" , |
c7fe3b52 | 243 | "clock-AF_NFC" , "clock-AF_MAX" |
443aef0e | 244 | }; |
da21f24d IM |
245 | |
246 | /* | |
247 | * sk_callback_lock locking rules are per-address-family, | |
248 | * so split the lock classes by using a per-AF key: | |
249 | */ | |
250 | static struct lock_class_key af_callback_keys[AF_MAX]; | |
251 | ||
1da177e4 LT |
252 | /* Take into consideration the size of the struct sk_buff overhead in the |
253 | * determination of these values, since that is non-constant across | |
254 | * platforms. This makes socket queueing behavior and performance | |
255 | * not depend upon such differences. | |
256 | */ | |
257 | #define _SK_MEM_PACKETS 256 | |
87fb4b7b | 258 | #define _SK_MEM_OVERHEAD SKB_TRUESIZE(256) |
1da177e4 LT |
259 | #define SK_WMEM_MAX (_SK_MEM_OVERHEAD * _SK_MEM_PACKETS) |
260 | #define SK_RMEM_MAX (_SK_MEM_OVERHEAD * _SK_MEM_PACKETS) | |
261 | ||
262 | /* Run time adjustable parameters. */ | |
ab32ea5d | 263 | __u32 sysctl_wmem_max __read_mostly = SK_WMEM_MAX; |
6d8ebc8a | 264 | EXPORT_SYMBOL(sysctl_wmem_max); |
ab32ea5d | 265 | __u32 sysctl_rmem_max __read_mostly = SK_RMEM_MAX; |
6d8ebc8a | 266 | EXPORT_SYMBOL(sysctl_rmem_max); |
ab32ea5d BH |
267 | __u32 sysctl_wmem_default __read_mostly = SK_WMEM_MAX; |
268 | __u32 sysctl_rmem_default __read_mostly = SK_RMEM_MAX; | |
1da177e4 | 269 | |
25985edc | 270 | /* Maximal space eaten by iovec or ancillary data plus some space */ |
ab32ea5d | 271 | int sysctl_optmem_max __read_mostly = sizeof(unsigned long)*(2*UIO_MAXIOV+512); |
2a91525c | 272 | EXPORT_SYMBOL(sysctl_optmem_max); |
1da177e4 | 273 | |
c93bdd0e MG |
274 | struct static_key memalloc_socks = STATIC_KEY_INIT_FALSE; |
275 | EXPORT_SYMBOL_GPL(memalloc_socks); | |
276 | ||
7cb02404 MG |
277 | /** |
278 | * sk_set_memalloc - sets %SOCK_MEMALLOC | |
279 | * @sk: socket to set it on | |
280 | * | |
281 | * Set %SOCK_MEMALLOC on a socket for access to emergency reserves. | |
282 | * It's the responsibility of the admin to adjust min_free_kbytes | |
283 | * to meet the requirements | |
284 | */ | |
285 | void sk_set_memalloc(struct sock *sk) | |
286 | { | |
287 | sock_set_flag(sk, SOCK_MEMALLOC); | |
288 | sk->sk_allocation |= __GFP_MEMALLOC; | |
c93bdd0e | 289 | static_key_slow_inc(&memalloc_socks); |
7cb02404 MG |
290 | } |
291 | EXPORT_SYMBOL_GPL(sk_set_memalloc); | |
292 | ||
293 | void sk_clear_memalloc(struct sock *sk) | |
294 | { | |
295 | sock_reset_flag(sk, SOCK_MEMALLOC); | |
296 | sk->sk_allocation &= ~__GFP_MEMALLOC; | |
c93bdd0e | 297 | static_key_slow_dec(&memalloc_socks); |
c76562b6 MG |
298 | |
299 | /* | |
300 | * SOCK_MEMALLOC is allowed to ignore rmem limits to ensure forward | |
301 | * progress of swapping. However, if SOCK_MEMALLOC is cleared while | |
302 | * it has rmem allocations there is a risk that the user of the | |
303 | * socket cannot make forward progress due to exceeding the rmem | |
304 | * limits. By rights, sk_clear_memalloc() should only be called | |
305 | * on sockets being torn down but warn and reset the accounting if | |
306 | * that assumption breaks. | |
307 | */ | |
308 | if (WARN_ON(sk->sk_forward_alloc)) | |
309 | sk_mem_reclaim(sk); | |
7cb02404 MG |
310 | } |
311 | EXPORT_SYMBOL_GPL(sk_clear_memalloc); | |
312 | ||
b4b9e355 MG |
313 | int __sk_backlog_rcv(struct sock *sk, struct sk_buff *skb) |
314 | { | |
315 | int ret; | |
316 | unsigned long pflags = current->flags; | |
317 | ||
318 | /* these should have been dropped before queueing */ | |
319 | BUG_ON(!sock_flag(sk, SOCK_MEMALLOC)); | |
320 | ||
321 | current->flags |= PF_MEMALLOC; | |
322 | ret = sk->sk_backlog_rcv(sk, skb); | |
323 | tsk_restore_flags(current, pflags, PF_MEMALLOC); | |
324 | ||
325 | return ret; | |
326 | } | |
327 | EXPORT_SYMBOL(__sk_backlog_rcv); | |
328 | ||
1da177e4 LT |
329 | static int sock_set_timeout(long *timeo_p, char __user *optval, int optlen) |
330 | { | |
331 | struct timeval tv; | |
332 | ||
333 | if (optlen < sizeof(tv)) | |
334 | return -EINVAL; | |
335 | if (copy_from_user(&tv, optval, sizeof(tv))) | |
336 | return -EFAULT; | |
ba78073e VA |
337 | if (tv.tv_usec < 0 || tv.tv_usec >= USEC_PER_SEC) |
338 | return -EDOM; | |
1da177e4 | 339 | |
ba78073e | 340 | if (tv.tv_sec < 0) { |
6f11df83 AM |
341 | static int warned __read_mostly; |
342 | ||
ba78073e | 343 | *timeo_p = 0; |
50aab54f | 344 | if (warned < 10 && net_ratelimit()) { |
ba78073e | 345 | warned++; |
e005d193 JP |
346 | pr_info("%s: `%s' (pid %d) tries to set negative timeout\n", |
347 | __func__, current->comm, task_pid_nr(current)); | |
50aab54f | 348 | } |
ba78073e VA |
349 | return 0; |
350 | } | |
1da177e4 LT |
351 | *timeo_p = MAX_SCHEDULE_TIMEOUT; |
352 | if (tv.tv_sec == 0 && tv.tv_usec == 0) | |
353 | return 0; | |
354 | if (tv.tv_sec < (MAX_SCHEDULE_TIMEOUT/HZ - 1)) | |
355 | *timeo_p = tv.tv_sec*HZ + (tv.tv_usec+(1000000/HZ-1))/(1000000/HZ); | |
356 | return 0; | |
357 | } | |
358 | ||
359 | static void sock_warn_obsolete_bsdism(const char *name) | |
360 | { | |
361 | static int warned; | |
362 | static char warncomm[TASK_COMM_LEN]; | |
4ec93edb YH |
363 | if (strcmp(warncomm, current->comm) && warned < 5) { |
364 | strcpy(warncomm, current->comm); | |
e005d193 JP |
365 | pr_warn("process `%s' is using obsolete %s SO_BSDCOMPAT\n", |
366 | warncomm, name); | |
1da177e4 LT |
367 | warned++; |
368 | } | |
369 | } | |
370 | ||
08e29af3 ED |
371 | #define SK_FLAGS_TIMESTAMP ((1UL << SOCK_TIMESTAMP) | (1UL << SOCK_TIMESTAMPING_RX_SOFTWARE)) |
372 | ||
373 | static void sock_disable_timestamp(struct sock *sk, unsigned long flags) | |
4ec93edb | 374 | { |
08e29af3 ED |
375 | if (sk->sk_flags & flags) { |
376 | sk->sk_flags &= ~flags; | |
377 | if (!(sk->sk_flags & SK_FLAGS_TIMESTAMP)) | |
20d49473 | 378 | net_disable_timestamp(); |
1da177e4 LT |
379 | } |
380 | } | |
381 | ||
382 | ||
f0088a50 DV |
383 | int sock_queue_rcv_skb(struct sock *sk, struct sk_buff *skb) |
384 | { | |
766e9037 | 385 | int err; |
f0088a50 | 386 | int skb_len; |
3b885787 NH |
387 | unsigned long flags; |
388 | struct sk_buff_head *list = &sk->sk_receive_queue; | |
f0088a50 | 389 | |
0fd7bac6 | 390 | if (atomic_read(&sk->sk_rmem_alloc) >= sk->sk_rcvbuf) { |
766e9037 | 391 | atomic_inc(&sk->sk_drops); |
3847ce32 | 392 | trace_sock_rcvqueue_full(sk, skb); |
766e9037 | 393 | return -ENOMEM; |
f0088a50 DV |
394 | } |
395 | ||
fda9ef5d | 396 | err = sk_filter(sk, skb); |
f0088a50 | 397 | if (err) |
766e9037 | 398 | return err; |
f0088a50 | 399 | |
c76562b6 | 400 | if (!sk_rmem_schedule(sk, skb, skb->truesize)) { |
766e9037 ED |
401 | atomic_inc(&sk->sk_drops); |
402 | return -ENOBUFS; | |
3ab224be HA |
403 | } |
404 | ||
f0088a50 DV |
405 | skb->dev = NULL; |
406 | skb_set_owner_r(skb, sk); | |
49ad9599 | 407 | |
f0088a50 DV |
408 | /* Cache the SKB length before we tack it onto the receive |
409 | * queue. Once it is added it no longer belongs to us and | |
410 | * may be freed by other threads of control pulling packets | |
411 | * from the queue. | |
412 | */ | |
413 | skb_len = skb->len; | |
414 | ||
7fee226a ED |
415 | /* we escape from rcu protected region, make sure we dont leak |
416 | * a norefcounted dst | |
417 | */ | |
418 | skb_dst_force(skb); | |
419 | ||
3b885787 NH |
420 | spin_lock_irqsave(&list->lock, flags); |
421 | skb->dropcount = atomic_read(&sk->sk_drops); | |
422 | __skb_queue_tail(list, skb); | |
423 | spin_unlock_irqrestore(&list->lock, flags); | |
f0088a50 DV |
424 | |
425 | if (!sock_flag(sk, SOCK_DEAD)) | |
426 | sk->sk_data_ready(sk, skb_len); | |
766e9037 | 427 | return 0; |
f0088a50 DV |
428 | } |
429 | EXPORT_SYMBOL(sock_queue_rcv_skb); | |
430 | ||
58a5a7b9 | 431 | int sk_receive_skb(struct sock *sk, struct sk_buff *skb, const int nested) |
f0088a50 DV |
432 | { |
433 | int rc = NET_RX_SUCCESS; | |
434 | ||
fda9ef5d | 435 | if (sk_filter(sk, skb)) |
f0088a50 DV |
436 | goto discard_and_relse; |
437 | ||
438 | skb->dev = NULL; | |
439 | ||
f545a38f | 440 | if (sk_rcvqueues_full(sk, skb, sk->sk_rcvbuf)) { |
c377411f ED |
441 | atomic_inc(&sk->sk_drops); |
442 | goto discard_and_relse; | |
443 | } | |
58a5a7b9 ACM |
444 | if (nested) |
445 | bh_lock_sock_nested(sk); | |
446 | else | |
447 | bh_lock_sock(sk); | |
a5b5bb9a IM |
448 | if (!sock_owned_by_user(sk)) { |
449 | /* | |
450 | * trylock + unlock semantics: | |
451 | */ | |
452 | mutex_acquire(&sk->sk_lock.dep_map, 0, 1, _RET_IP_); | |
453 | ||
c57943a1 | 454 | rc = sk_backlog_rcv(sk, skb); |
a5b5bb9a IM |
455 | |
456 | mutex_release(&sk->sk_lock.dep_map, 1, _RET_IP_); | |
f545a38f | 457 | } else if (sk_add_backlog(sk, skb, sk->sk_rcvbuf)) { |
8eae939f ZY |
458 | bh_unlock_sock(sk); |
459 | atomic_inc(&sk->sk_drops); | |
460 | goto discard_and_relse; | |
461 | } | |
462 | ||
f0088a50 DV |
463 | bh_unlock_sock(sk); |
464 | out: | |
465 | sock_put(sk); | |
466 | return rc; | |
467 | discard_and_relse: | |
468 | kfree_skb(skb); | |
469 | goto out; | |
470 | } | |
471 | EXPORT_SYMBOL(sk_receive_skb); | |
472 | ||
ea94ff3b KK |
473 | void sk_reset_txq(struct sock *sk) |
474 | { | |
475 | sk_tx_queue_clear(sk); | |
476 | } | |
477 | EXPORT_SYMBOL(sk_reset_txq); | |
478 | ||
f0088a50 DV |
479 | struct dst_entry *__sk_dst_check(struct sock *sk, u32 cookie) |
480 | { | |
b6c6712a | 481 | struct dst_entry *dst = __sk_dst_get(sk); |
f0088a50 DV |
482 | |
483 | if (dst && dst->obsolete && dst->ops->check(dst, cookie) == NULL) { | |
e022f0b4 | 484 | sk_tx_queue_clear(sk); |
a9b3cd7f | 485 | RCU_INIT_POINTER(sk->sk_dst_cache, NULL); |
f0088a50 DV |
486 | dst_release(dst); |
487 | return NULL; | |
488 | } | |
489 | ||
490 | return dst; | |
491 | } | |
492 | EXPORT_SYMBOL(__sk_dst_check); | |
493 | ||
494 | struct dst_entry *sk_dst_check(struct sock *sk, u32 cookie) | |
495 | { | |
496 | struct dst_entry *dst = sk_dst_get(sk); | |
497 | ||
498 | if (dst && dst->obsolete && dst->ops->check(dst, cookie) == NULL) { | |
499 | sk_dst_reset(sk); | |
500 | dst_release(dst); | |
501 | return NULL; | |
502 | } | |
503 | ||
504 | return dst; | |
505 | } | |
506 | EXPORT_SYMBOL(sk_dst_check); | |
507 | ||
c91f6df2 BH |
508 | static int sock_setbindtodevice(struct sock *sk, char __user *optval, |
509 | int optlen) | |
4878809f DM |
510 | { |
511 | int ret = -ENOPROTOOPT; | |
512 | #ifdef CONFIG_NETDEVICES | |
3b1e0a65 | 513 | struct net *net = sock_net(sk); |
4878809f DM |
514 | char devname[IFNAMSIZ]; |
515 | int index; | |
516 | ||
517 | /* Sorry... */ | |
518 | ret = -EPERM; | |
5e1fccc0 | 519 | if (!ns_capable(net->user_ns, CAP_NET_RAW)) |
4878809f DM |
520 | goto out; |
521 | ||
522 | ret = -EINVAL; | |
523 | if (optlen < 0) | |
524 | goto out; | |
525 | ||
526 | /* Bind this socket to a particular device like "eth0", | |
527 | * as specified in the passed interface name. If the | |
528 | * name is "" or the option length is zero the socket | |
529 | * is not bound. | |
530 | */ | |
531 | if (optlen > IFNAMSIZ - 1) | |
532 | optlen = IFNAMSIZ - 1; | |
533 | memset(devname, 0, sizeof(devname)); | |
534 | ||
535 | ret = -EFAULT; | |
536 | if (copy_from_user(devname, optval, optlen)) | |
537 | goto out; | |
538 | ||
000ba2e4 DM |
539 | index = 0; |
540 | if (devname[0] != '\0') { | |
bf8e56bf | 541 | struct net_device *dev; |
4878809f | 542 | |
bf8e56bf ED |
543 | rcu_read_lock(); |
544 | dev = dev_get_by_name_rcu(net, devname); | |
545 | if (dev) | |
546 | index = dev->ifindex; | |
547 | rcu_read_unlock(); | |
4878809f DM |
548 | ret = -ENODEV; |
549 | if (!dev) | |
550 | goto out; | |
4878809f DM |
551 | } |
552 | ||
553 | lock_sock(sk); | |
554 | sk->sk_bound_dev_if = index; | |
555 | sk_dst_reset(sk); | |
556 | release_sock(sk); | |
557 | ||
558 | ret = 0; | |
559 | ||
560 | out: | |
561 | #endif | |
562 | ||
563 | return ret; | |
564 | } | |
565 | ||
c91f6df2 BH |
566 | static int sock_getbindtodevice(struct sock *sk, char __user *optval, |
567 | int __user *optlen, int len) | |
568 | { | |
569 | int ret = -ENOPROTOOPT; | |
570 | #ifdef CONFIG_NETDEVICES | |
571 | struct net *net = sock_net(sk); | |
572 | struct net_device *dev; | |
573 | char devname[IFNAMSIZ]; | |
574 | unsigned seq; | |
575 | ||
576 | if (sk->sk_bound_dev_if == 0) { | |
577 | len = 0; | |
578 | goto zero; | |
579 | } | |
580 | ||
581 | ret = -EINVAL; | |
582 | if (len < IFNAMSIZ) | |
583 | goto out; | |
584 | ||
585 | retry: | |
30e6c9fa | 586 | seq = read_seqcount_begin(&devnet_rename_seq); |
c91f6df2 BH |
587 | rcu_read_lock(); |
588 | dev = dev_get_by_index_rcu(net, sk->sk_bound_dev_if); | |
589 | ret = -ENODEV; | |
590 | if (!dev) { | |
591 | rcu_read_unlock(); | |
592 | goto out; | |
593 | } | |
594 | ||
595 | strcpy(devname, dev->name); | |
596 | rcu_read_unlock(); | |
30e6c9fa | 597 | if (read_seqcount_retry(&devnet_rename_seq, seq)) |
c91f6df2 BH |
598 | goto retry; |
599 | ||
600 | len = strlen(devname) + 1; | |
601 | ||
602 | ret = -EFAULT; | |
603 | if (copy_to_user(optval, devname, len)) | |
604 | goto out; | |
605 | ||
606 | zero: | |
607 | ret = -EFAULT; | |
608 | if (put_user(len, optlen)) | |
609 | goto out; | |
610 | ||
611 | ret = 0; | |
612 | ||
613 | out: | |
614 | #endif | |
615 | ||
616 | return ret; | |
617 | } | |
618 | ||
c0ef877b PE |
619 | static inline void sock_valbool_flag(struct sock *sk, int bit, int valbool) |
620 | { | |
621 | if (valbool) | |
622 | sock_set_flag(sk, bit); | |
623 | else | |
624 | sock_reset_flag(sk, bit); | |
625 | } | |
626 | ||
1da177e4 LT |
627 | /* |
628 | * This is meant for all protocols to use and covers goings on | |
629 | * at the socket level. Everything here is generic. | |
630 | */ | |
631 | ||
632 | int sock_setsockopt(struct socket *sock, int level, int optname, | |
b7058842 | 633 | char __user *optval, unsigned int optlen) |
1da177e4 | 634 | { |
2a91525c | 635 | struct sock *sk = sock->sk; |
1da177e4 LT |
636 | int val; |
637 | int valbool; | |
638 | struct linger ling; | |
639 | int ret = 0; | |
4ec93edb | 640 | |
1da177e4 LT |
641 | /* |
642 | * Options without arguments | |
643 | */ | |
644 | ||
4878809f | 645 | if (optname == SO_BINDTODEVICE) |
c91f6df2 | 646 | return sock_setbindtodevice(sk, optval, optlen); |
4878809f | 647 | |
e71a4783 SH |
648 | if (optlen < sizeof(int)) |
649 | return -EINVAL; | |
4ec93edb | 650 | |
1da177e4 LT |
651 | if (get_user(val, (int __user *)optval)) |
652 | return -EFAULT; | |
4ec93edb | 653 | |
2a91525c | 654 | valbool = val ? 1 : 0; |
1da177e4 LT |
655 | |
656 | lock_sock(sk); | |
657 | ||
2a91525c | 658 | switch (optname) { |
e71a4783 | 659 | case SO_DEBUG: |
2a91525c | 660 | if (val && !capable(CAP_NET_ADMIN)) |
e71a4783 | 661 | ret = -EACCES; |
2a91525c | 662 | else |
c0ef877b | 663 | sock_valbool_flag(sk, SOCK_DBG, valbool); |
e71a4783 SH |
664 | break; |
665 | case SO_REUSEADDR: | |
4a17fd52 | 666 | sk->sk_reuse = (valbool ? SK_CAN_REUSE : SK_NO_REUSE); |
e71a4783 SH |
667 | break; |
668 | case SO_TYPE: | |
49c794e9 | 669 | case SO_PROTOCOL: |
0d6038ee | 670 | case SO_DOMAIN: |
e71a4783 SH |
671 | case SO_ERROR: |
672 | ret = -ENOPROTOOPT; | |
673 | break; | |
674 | case SO_DONTROUTE: | |
c0ef877b | 675 | sock_valbool_flag(sk, SOCK_LOCALROUTE, valbool); |
e71a4783 SH |
676 | break; |
677 | case SO_BROADCAST: | |
678 | sock_valbool_flag(sk, SOCK_BROADCAST, valbool); | |
679 | break; | |
680 | case SO_SNDBUF: | |
681 | /* Don't error on this BSD doesn't and if you think | |
82981930 ED |
682 | * about it this is right. Otherwise apps have to |
683 | * play 'guess the biggest size' games. RCVBUF/SNDBUF | |
684 | * are treated in BSD as hints | |
685 | */ | |
686 | val = min_t(u32, val, sysctl_wmem_max); | |
b0573dea | 687 | set_sndbuf: |
e71a4783 | 688 | sk->sk_userlocks |= SOCK_SNDBUF_LOCK; |
82981930 ED |
689 | sk->sk_sndbuf = max_t(u32, val * 2, SOCK_MIN_SNDBUF); |
690 | /* Wake up sending tasks if we upped the value. */ | |
e71a4783 SH |
691 | sk->sk_write_space(sk); |
692 | break; | |
1da177e4 | 693 | |
e71a4783 SH |
694 | case SO_SNDBUFFORCE: |
695 | if (!capable(CAP_NET_ADMIN)) { | |
696 | ret = -EPERM; | |
697 | break; | |
698 | } | |
699 | goto set_sndbuf; | |
b0573dea | 700 | |
e71a4783 SH |
701 | case SO_RCVBUF: |
702 | /* Don't error on this BSD doesn't and if you think | |
82981930 ED |
703 | * about it this is right. Otherwise apps have to |
704 | * play 'guess the biggest size' games. RCVBUF/SNDBUF | |
705 | * are treated in BSD as hints | |
706 | */ | |
707 | val = min_t(u32, val, sysctl_rmem_max); | |
b0573dea | 708 | set_rcvbuf: |
e71a4783 SH |
709 | sk->sk_userlocks |= SOCK_RCVBUF_LOCK; |
710 | /* | |
711 | * We double it on the way in to account for | |
712 | * "struct sk_buff" etc. overhead. Applications | |
713 | * assume that the SO_RCVBUF setting they make will | |
714 | * allow that much actual data to be received on that | |
715 | * socket. | |
716 | * | |
717 | * Applications are unaware that "struct sk_buff" and | |
718 | * other overheads allocate from the receive buffer | |
719 | * during socket buffer allocation. | |
720 | * | |
721 | * And after considering the possible alternatives, | |
722 | * returning the value we actually used in getsockopt | |
723 | * is the most desirable behavior. | |
724 | */ | |
82981930 | 725 | sk->sk_rcvbuf = max_t(u32, val * 2, SOCK_MIN_RCVBUF); |
e71a4783 SH |
726 | break; |
727 | ||
728 | case SO_RCVBUFFORCE: | |
729 | if (!capable(CAP_NET_ADMIN)) { | |
730 | ret = -EPERM; | |
1da177e4 | 731 | break; |
e71a4783 SH |
732 | } |
733 | goto set_rcvbuf; | |
1da177e4 | 734 | |
e71a4783 | 735 | case SO_KEEPALIVE: |
1da177e4 | 736 | #ifdef CONFIG_INET |
3e10986d ED |
737 | if (sk->sk_protocol == IPPROTO_TCP && |
738 | sk->sk_type == SOCK_STREAM) | |
e71a4783 | 739 | tcp_set_keepalive(sk, valbool); |
1da177e4 | 740 | #endif |
e71a4783 SH |
741 | sock_valbool_flag(sk, SOCK_KEEPOPEN, valbool); |
742 | break; | |
743 | ||
744 | case SO_OOBINLINE: | |
745 | sock_valbool_flag(sk, SOCK_URGINLINE, valbool); | |
746 | break; | |
747 | ||
748 | case SO_NO_CHECK: | |
749 | sk->sk_no_check = valbool; | |
750 | break; | |
751 | ||
752 | case SO_PRIORITY: | |
5e1fccc0 EB |
753 | if ((val >= 0 && val <= 6) || |
754 | ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN)) | |
e71a4783 SH |
755 | sk->sk_priority = val; |
756 | else | |
757 | ret = -EPERM; | |
758 | break; | |
759 | ||
760 | case SO_LINGER: | |
761 | if (optlen < sizeof(ling)) { | |
762 | ret = -EINVAL; /* 1003.1g */ | |
1da177e4 | 763 | break; |
e71a4783 | 764 | } |
2a91525c | 765 | if (copy_from_user(&ling, optval, sizeof(ling))) { |
e71a4783 | 766 | ret = -EFAULT; |
1da177e4 | 767 | break; |
e71a4783 SH |
768 | } |
769 | if (!ling.l_onoff) | |
770 | sock_reset_flag(sk, SOCK_LINGER); | |
771 | else { | |
1da177e4 | 772 | #if (BITS_PER_LONG == 32) |
e71a4783 SH |
773 | if ((unsigned int)ling.l_linger >= MAX_SCHEDULE_TIMEOUT/HZ) |
774 | sk->sk_lingertime = MAX_SCHEDULE_TIMEOUT; | |
1da177e4 | 775 | else |
e71a4783 SH |
776 | #endif |
777 | sk->sk_lingertime = (unsigned int)ling.l_linger * HZ; | |
778 | sock_set_flag(sk, SOCK_LINGER); | |
779 | } | |
780 | break; | |
781 | ||
782 | case SO_BSDCOMPAT: | |
783 | sock_warn_obsolete_bsdism("setsockopt"); | |
784 | break; | |
785 | ||
786 | case SO_PASSCRED: | |
787 | if (valbool) | |
788 | set_bit(SOCK_PASSCRED, &sock->flags); | |
789 | else | |
790 | clear_bit(SOCK_PASSCRED, &sock->flags); | |
791 | break; | |
792 | ||
793 | case SO_TIMESTAMP: | |
92f37fd2 | 794 | case SO_TIMESTAMPNS: |
e71a4783 | 795 | if (valbool) { |
92f37fd2 ED |
796 | if (optname == SO_TIMESTAMP) |
797 | sock_reset_flag(sk, SOCK_RCVTSTAMPNS); | |
798 | else | |
799 | sock_set_flag(sk, SOCK_RCVTSTAMPNS); | |
e71a4783 | 800 | sock_set_flag(sk, SOCK_RCVTSTAMP); |
20d49473 | 801 | sock_enable_timestamp(sk, SOCK_TIMESTAMP); |
92f37fd2 | 802 | } else { |
e71a4783 | 803 | sock_reset_flag(sk, SOCK_RCVTSTAMP); |
92f37fd2 ED |
804 | sock_reset_flag(sk, SOCK_RCVTSTAMPNS); |
805 | } | |
e71a4783 SH |
806 | break; |
807 | ||
20d49473 PO |
808 | case SO_TIMESTAMPING: |
809 | if (val & ~SOF_TIMESTAMPING_MASK) { | |
f249fb78 | 810 | ret = -EINVAL; |
20d49473 PO |
811 | break; |
812 | } | |
813 | sock_valbool_flag(sk, SOCK_TIMESTAMPING_TX_HARDWARE, | |
814 | val & SOF_TIMESTAMPING_TX_HARDWARE); | |
815 | sock_valbool_flag(sk, SOCK_TIMESTAMPING_TX_SOFTWARE, | |
816 | val & SOF_TIMESTAMPING_TX_SOFTWARE); | |
817 | sock_valbool_flag(sk, SOCK_TIMESTAMPING_RX_HARDWARE, | |
818 | val & SOF_TIMESTAMPING_RX_HARDWARE); | |
819 | if (val & SOF_TIMESTAMPING_RX_SOFTWARE) | |
820 | sock_enable_timestamp(sk, | |
821 | SOCK_TIMESTAMPING_RX_SOFTWARE); | |
822 | else | |
823 | sock_disable_timestamp(sk, | |
08e29af3 | 824 | (1UL << SOCK_TIMESTAMPING_RX_SOFTWARE)); |
20d49473 PO |
825 | sock_valbool_flag(sk, SOCK_TIMESTAMPING_SOFTWARE, |
826 | val & SOF_TIMESTAMPING_SOFTWARE); | |
827 | sock_valbool_flag(sk, SOCK_TIMESTAMPING_SYS_HARDWARE, | |
828 | val & SOF_TIMESTAMPING_SYS_HARDWARE); | |
829 | sock_valbool_flag(sk, SOCK_TIMESTAMPING_RAW_HARDWARE, | |
830 | val & SOF_TIMESTAMPING_RAW_HARDWARE); | |
831 | break; | |
832 | ||
e71a4783 SH |
833 | case SO_RCVLOWAT: |
834 | if (val < 0) | |
835 | val = INT_MAX; | |
836 | sk->sk_rcvlowat = val ? : 1; | |
837 | break; | |
838 | ||
839 | case SO_RCVTIMEO: | |
840 | ret = sock_set_timeout(&sk->sk_rcvtimeo, optval, optlen); | |
841 | break; | |
842 | ||
843 | case SO_SNDTIMEO: | |
844 | ret = sock_set_timeout(&sk->sk_sndtimeo, optval, optlen); | |
845 | break; | |
1da177e4 | 846 | |
e71a4783 SH |
847 | case SO_ATTACH_FILTER: |
848 | ret = -EINVAL; | |
849 | if (optlen == sizeof(struct sock_fprog)) { | |
850 | struct sock_fprog fprog; | |
1da177e4 | 851 | |
e71a4783 SH |
852 | ret = -EFAULT; |
853 | if (copy_from_user(&fprog, optval, sizeof(fprog))) | |
1da177e4 | 854 | break; |
e71a4783 SH |
855 | |
856 | ret = sk_attach_filter(&fprog, sk); | |
857 | } | |
858 | break; | |
859 | ||
860 | case SO_DETACH_FILTER: | |
55b33325 | 861 | ret = sk_detach_filter(sk); |
e71a4783 | 862 | break; |
1da177e4 | 863 | |
e71a4783 SH |
864 | case SO_PASSSEC: |
865 | if (valbool) | |
866 | set_bit(SOCK_PASSSEC, &sock->flags); | |
867 | else | |
868 | clear_bit(SOCK_PASSSEC, &sock->flags); | |
869 | break; | |
4a19ec58 | 870 | case SO_MARK: |
5e1fccc0 | 871 | if (!ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN)) |
4a19ec58 | 872 | ret = -EPERM; |
2a91525c | 873 | else |
4a19ec58 | 874 | sk->sk_mark = val; |
4a19ec58 | 875 | break; |
877ce7c1 | 876 | |
1da177e4 LT |
877 | /* We implement the SO_SNDLOWAT etc to |
878 | not be settable (1003.1g 5.3) */ | |
3b885787 | 879 | case SO_RXQ_OVFL: |
8083f0fc | 880 | sock_valbool_flag(sk, SOCK_RXQ_OVFL, valbool); |
3b885787 | 881 | break; |
6e3e939f JB |
882 | |
883 | case SO_WIFI_STATUS: | |
884 | sock_valbool_flag(sk, SOCK_WIFI_STATUS, valbool); | |
885 | break; | |
886 | ||
ef64a54f PE |
887 | case SO_PEEK_OFF: |
888 | if (sock->ops->set_peek_off) | |
889 | sock->ops->set_peek_off(sk, val); | |
890 | else | |
891 | ret = -EOPNOTSUPP; | |
892 | break; | |
3bdc0eba BG |
893 | |
894 | case SO_NOFCS: | |
895 | sock_valbool_flag(sk, SOCK_NOFCS, valbool); | |
896 | break; | |
897 | ||
e71a4783 SH |
898 | default: |
899 | ret = -ENOPROTOOPT; | |
900 | break; | |
4ec93edb | 901 | } |
1da177e4 LT |
902 | release_sock(sk); |
903 | return ret; | |
904 | } | |
2a91525c | 905 | EXPORT_SYMBOL(sock_setsockopt); |
1da177e4 LT |
906 | |
907 | ||
3f551f94 EB |
908 | void cred_to_ucred(struct pid *pid, const struct cred *cred, |
909 | struct ucred *ucred) | |
910 | { | |
911 | ucred->pid = pid_vnr(pid); | |
912 | ucred->uid = ucred->gid = -1; | |
913 | if (cred) { | |
914 | struct user_namespace *current_ns = current_user_ns(); | |
915 | ||
b2e4f544 EB |
916 | ucred->uid = from_kuid_munged(current_ns, cred->euid); |
917 | ucred->gid = from_kgid_munged(current_ns, cred->egid); | |
3f551f94 EB |
918 | } |
919 | } | |
3924773a | 920 | EXPORT_SYMBOL_GPL(cred_to_ucred); |
3f551f94 | 921 | |
1da177e4 LT |
922 | int sock_getsockopt(struct socket *sock, int level, int optname, |
923 | char __user *optval, int __user *optlen) | |
924 | { | |
925 | struct sock *sk = sock->sk; | |
4ec93edb | 926 | |
e71a4783 | 927 | union { |
4ec93edb YH |
928 | int val; |
929 | struct linger ling; | |
1da177e4 LT |
930 | struct timeval tm; |
931 | } v; | |
4ec93edb | 932 | |
4d0392be | 933 | int lv = sizeof(int); |
1da177e4 | 934 | int len; |
4ec93edb | 935 | |
e71a4783 | 936 | if (get_user(len, optlen)) |
4ec93edb | 937 | return -EFAULT; |
e71a4783 | 938 | if (len < 0) |
1da177e4 | 939 | return -EINVAL; |
4ec93edb | 940 | |
50fee1de | 941 | memset(&v, 0, sizeof(v)); |
df0bca04 | 942 | |
2a91525c | 943 | switch (optname) { |
e71a4783 SH |
944 | case SO_DEBUG: |
945 | v.val = sock_flag(sk, SOCK_DBG); | |
946 | break; | |
947 | ||
948 | case SO_DONTROUTE: | |
949 | v.val = sock_flag(sk, SOCK_LOCALROUTE); | |
950 | break; | |
951 | ||
952 | case SO_BROADCAST: | |
1b23a5df | 953 | v.val = sock_flag(sk, SOCK_BROADCAST); |
e71a4783 SH |
954 | break; |
955 | ||
956 | case SO_SNDBUF: | |
957 | v.val = sk->sk_sndbuf; | |
958 | break; | |
959 | ||
960 | case SO_RCVBUF: | |
961 | v.val = sk->sk_rcvbuf; | |
962 | break; | |
963 | ||
964 | case SO_REUSEADDR: | |
965 | v.val = sk->sk_reuse; | |
966 | break; | |
967 | ||
968 | case SO_KEEPALIVE: | |
1b23a5df | 969 | v.val = sock_flag(sk, SOCK_KEEPOPEN); |
e71a4783 SH |
970 | break; |
971 | ||
972 | case SO_TYPE: | |
973 | v.val = sk->sk_type; | |
974 | break; | |
975 | ||
49c794e9 JE |
976 | case SO_PROTOCOL: |
977 | v.val = sk->sk_protocol; | |
978 | break; | |
979 | ||
0d6038ee JE |
980 | case SO_DOMAIN: |
981 | v.val = sk->sk_family; | |
982 | break; | |
983 | ||
e71a4783 SH |
984 | case SO_ERROR: |
985 | v.val = -sock_error(sk); | |
2a91525c | 986 | if (v.val == 0) |
e71a4783 SH |
987 | v.val = xchg(&sk->sk_err_soft, 0); |
988 | break; | |
989 | ||
990 | case SO_OOBINLINE: | |
1b23a5df | 991 | v.val = sock_flag(sk, SOCK_URGINLINE); |
e71a4783 SH |
992 | break; |
993 | ||
994 | case SO_NO_CHECK: | |
995 | v.val = sk->sk_no_check; | |
996 | break; | |
997 | ||
998 | case SO_PRIORITY: | |
999 | v.val = sk->sk_priority; | |
1000 | break; | |
1001 | ||
1002 | case SO_LINGER: | |
1003 | lv = sizeof(v.ling); | |
1b23a5df | 1004 | v.ling.l_onoff = sock_flag(sk, SOCK_LINGER); |
e71a4783 SH |
1005 | v.ling.l_linger = sk->sk_lingertime / HZ; |
1006 | break; | |
1007 | ||
1008 | case SO_BSDCOMPAT: | |
1009 | sock_warn_obsolete_bsdism("getsockopt"); | |
1010 | break; | |
1011 | ||
1012 | case SO_TIMESTAMP: | |
92f37fd2 ED |
1013 | v.val = sock_flag(sk, SOCK_RCVTSTAMP) && |
1014 | !sock_flag(sk, SOCK_RCVTSTAMPNS); | |
1015 | break; | |
1016 | ||
1017 | case SO_TIMESTAMPNS: | |
1018 | v.val = sock_flag(sk, SOCK_RCVTSTAMPNS); | |
e71a4783 SH |
1019 | break; |
1020 | ||
20d49473 PO |
1021 | case SO_TIMESTAMPING: |
1022 | v.val = 0; | |
1023 | if (sock_flag(sk, SOCK_TIMESTAMPING_TX_HARDWARE)) | |
1024 | v.val |= SOF_TIMESTAMPING_TX_HARDWARE; | |
1025 | if (sock_flag(sk, SOCK_TIMESTAMPING_TX_SOFTWARE)) | |
1026 | v.val |= SOF_TIMESTAMPING_TX_SOFTWARE; | |
1027 | if (sock_flag(sk, SOCK_TIMESTAMPING_RX_HARDWARE)) | |
1028 | v.val |= SOF_TIMESTAMPING_RX_HARDWARE; | |
1029 | if (sock_flag(sk, SOCK_TIMESTAMPING_RX_SOFTWARE)) | |
1030 | v.val |= SOF_TIMESTAMPING_RX_SOFTWARE; | |
1031 | if (sock_flag(sk, SOCK_TIMESTAMPING_SOFTWARE)) | |
1032 | v.val |= SOF_TIMESTAMPING_SOFTWARE; | |
1033 | if (sock_flag(sk, SOCK_TIMESTAMPING_SYS_HARDWARE)) | |
1034 | v.val |= SOF_TIMESTAMPING_SYS_HARDWARE; | |
1035 | if (sock_flag(sk, SOCK_TIMESTAMPING_RAW_HARDWARE)) | |
1036 | v.val |= SOF_TIMESTAMPING_RAW_HARDWARE; | |
1037 | break; | |
1038 | ||
e71a4783 | 1039 | case SO_RCVTIMEO: |
2a91525c | 1040 | lv = sizeof(struct timeval); |
e71a4783 SH |
1041 | if (sk->sk_rcvtimeo == MAX_SCHEDULE_TIMEOUT) { |
1042 | v.tm.tv_sec = 0; | |
1043 | v.tm.tv_usec = 0; | |
1044 | } else { | |
1045 | v.tm.tv_sec = sk->sk_rcvtimeo / HZ; | |
1046 | v.tm.tv_usec = ((sk->sk_rcvtimeo % HZ) * 1000000) / HZ; | |
1047 | } | |
1048 | break; | |
1049 | ||
1050 | case SO_SNDTIMEO: | |
2a91525c | 1051 | lv = sizeof(struct timeval); |
e71a4783 SH |
1052 | if (sk->sk_sndtimeo == MAX_SCHEDULE_TIMEOUT) { |
1053 | v.tm.tv_sec = 0; | |
1054 | v.tm.tv_usec = 0; | |
1055 | } else { | |
1056 | v.tm.tv_sec = sk->sk_sndtimeo / HZ; | |
1057 | v.tm.tv_usec = ((sk->sk_sndtimeo % HZ) * 1000000) / HZ; | |
1058 | } | |
1059 | break; | |
1da177e4 | 1060 | |
e71a4783 SH |
1061 | case SO_RCVLOWAT: |
1062 | v.val = sk->sk_rcvlowat; | |
1063 | break; | |
1da177e4 | 1064 | |
e71a4783 | 1065 | case SO_SNDLOWAT: |
2a91525c | 1066 | v.val = 1; |
e71a4783 | 1067 | break; |
1da177e4 | 1068 | |
e71a4783 | 1069 | case SO_PASSCRED: |
82981930 | 1070 | v.val = !!test_bit(SOCK_PASSCRED, &sock->flags); |
e71a4783 | 1071 | break; |
1da177e4 | 1072 | |
e71a4783 | 1073 | case SO_PEERCRED: |
109f6e39 EB |
1074 | { |
1075 | struct ucred peercred; | |
1076 | if (len > sizeof(peercred)) | |
1077 | len = sizeof(peercred); | |
1078 | cred_to_ucred(sk->sk_peer_pid, sk->sk_peer_cred, &peercred); | |
1079 | if (copy_to_user(optval, &peercred, len)) | |
e71a4783 SH |
1080 | return -EFAULT; |
1081 | goto lenout; | |
109f6e39 | 1082 | } |
1da177e4 | 1083 | |
e71a4783 SH |
1084 | case SO_PEERNAME: |
1085 | { | |
1086 | char address[128]; | |
1087 | ||
1088 | if (sock->ops->getname(sock, (struct sockaddr *)address, &lv, 2)) | |
1089 | return -ENOTCONN; | |
1090 | if (lv < len) | |
1091 | return -EINVAL; | |
1092 | if (copy_to_user(optval, address, len)) | |
1093 | return -EFAULT; | |
1094 | goto lenout; | |
1095 | } | |
1da177e4 | 1096 | |
e71a4783 SH |
1097 | /* Dubious BSD thing... Probably nobody even uses it, but |
1098 | * the UNIX standard wants it for whatever reason... -DaveM | |
1099 | */ | |
1100 | case SO_ACCEPTCONN: | |
1101 | v.val = sk->sk_state == TCP_LISTEN; | |
1102 | break; | |
1da177e4 | 1103 | |
e71a4783 | 1104 | case SO_PASSSEC: |
82981930 | 1105 | v.val = !!test_bit(SOCK_PASSSEC, &sock->flags); |
e71a4783 | 1106 | break; |
877ce7c1 | 1107 | |
e71a4783 SH |
1108 | case SO_PEERSEC: |
1109 | return security_socket_getpeersec_stream(sock, optval, optlen, len); | |
1da177e4 | 1110 | |
4a19ec58 LAT |
1111 | case SO_MARK: |
1112 | v.val = sk->sk_mark; | |
1113 | break; | |
1114 | ||
3b885787 | 1115 | case SO_RXQ_OVFL: |
1b23a5df | 1116 | v.val = sock_flag(sk, SOCK_RXQ_OVFL); |
3b885787 NH |
1117 | break; |
1118 | ||
6e3e939f | 1119 | case SO_WIFI_STATUS: |
1b23a5df | 1120 | v.val = sock_flag(sk, SOCK_WIFI_STATUS); |
6e3e939f JB |
1121 | break; |
1122 | ||
ef64a54f PE |
1123 | case SO_PEEK_OFF: |
1124 | if (!sock->ops->set_peek_off) | |
1125 | return -EOPNOTSUPP; | |
1126 | ||
1127 | v.val = sk->sk_peek_off; | |
1128 | break; | |
bc2f7996 | 1129 | case SO_NOFCS: |
1b23a5df | 1130 | v.val = sock_flag(sk, SOCK_NOFCS); |
bc2f7996 | 1131 | break; |
c91f6df2 | 1132 | |
f7b86bfe | 1133 | case SO_BINDTODEVICE: |
c91f6df2 BH |
1134 | return sock_getbindtodevice(sk, optval, optlen, len); |
1135 | ||
a8fc9277 PE |
1136 | case SO_GET_FILTER: |
1137 | len = sk_get_filter(sk, (struct sock_filter __user *)optval, len); | |
1138 | if (len < 0) | |
1139 | return len; | |
1140 | ||
1141 | goto lenout; | |
c91f6df2 | 1142 | |
e71a4783 SH |
1143 | default: |
1144 | return -ENOPROTOOPT; | |
1da177e4 | 1145 | } |
e71a4783 | 1146 | |
1da177e4 LT |
1147 | if (len > lv) |
1148 | len = lv; | |
1149 | if (copy_to_user(optval, &v, len)) | |
1150 | return -EFAULT; | |
1151 | lenout: | |
4ec93edb YH |
1152 | if (put_user(len, optlen)) |
1153 | return -EFAULT; | |
1154 | return 0; | |
1da177e4 LT |
1155 | } |
1156 | ||
a5b5bb9a IM |
1157 | /* |
1158 | * Initialize an sk_lock. | |
1159 | * | |
1160 | * (We also register the sk_lock with the lock validator.) | |
1161 | */ | |
b6f99a21 | 1162 | static inline void sock_lock_init(struct sock *sk) |
a5b5bb9a | 1163 | { |
ed07536e PZ |
1164 | sock_lock_init_class_and_name(sk, |
1165 | af_family_slock_key_strings[sk->sk_family], | |
1166 | af_family_slock_keys + sk->sk_family, | |
1167 | af_family_key_strings[sk->sk_family], | |
1168 | af_family_keys + sk->sk_family); | |
a5b5bb9a IM |
1169 | } |
1170 | ||
4dc6dc71 ED |
1171 | /* |
1172 | * Copy all fields from osk to nsk but nsk->sk_refcnt must not change yet, | |
1173 | * even temporarly, because of RCU lookups. sk_node should also be left as is. | |
68835aba | 1174 | * We must not copy fields between sk_dontcopy_begin and sk_dontcopy_end |
4dc6dc71 | 1175 | */ |
f1a6c4da PE |
1176 | static void sock_copy(struct sock *nsk, const struct sock *osk) |
1177 | { | |
1178 | #ifdef CONFIG_SECURITY_NETWORK | |
1179 | void *sptr = nsk->sk_security; | |
1180 | #endif | |
68835aba ED |
1181 | memcpy(nsk, osk, offsetof(struct sock, sk_dontcopy_begin)); |
1182 | ||
1183 | memcpy(&nsk->sk_dontcopy_end, &osk->sk_dontcopy_end, | |
1184 | osk->sk_prot->obj_size - offsetof(struct sock, sk_dontcopy_end)); | |
1185 | ||
f1a6c4da PE |
1186 | #ifdef CONFIG_SECURITY_NETWORK |
1187 | nsk->sk_security = sptr; | |
1188 | security_sk_clone(osk, nsk); | |
1189 | #endif | |
1190 | } | |
1191 | ||
fcbdf09d OP |
1192 | /* |
1193 | * caches using SLAB_DESTROY_BY_RCU should let .next pointer from nulls nodes | |
1194 | * un-modified. Special care is taken when initializing object to zero. | |
1195 | */ | |
1196 | static inline void sk_prot_clear_nulls(struct sock *sk, int size) | |
1197 | { | |
1198 | if (offsetof(struct sock, sk_node.next) != 0) | |
1199 | memset(sk, 0, offsetof(struct sock, sk_node.next)); | |
1200 | memset(&sk->sk_node.pprev, 0, | |
1201 | size - offsetof(struct sock, sk_node.pprev)); | |
1202 | } | |
1203 | ||
1204 | void sk_prot_clear_portaddr_nulls(struct sock *sk, int size) | |
1205 | { | |
1206 | unsigned long nulls1, nulls2; | |
1207 | ||
1208 | nulls1 = offsetof(struct sock, __sk_common.skc_node.next); | |
1209 | nulls2 = offsetof(struct sock, __sk_common.skc_portaddr_node.next); | |
1210 | if (nulls1 > nulls2) | |
1211 | swap(nulls1, nulls2); | |
1212 | ||
1213 | if (nulls1 != 0) | |
1214 | memset((char *)sk, 0, nulls1); | |
1215 | memset((char *)sk + nulls1 + sizeof(void *), 0, | |
1216 | nulls2 - nulls1 - sizeof(void *)); | |
1217 | memset((char *)sk + nulls2 + sizeof(void *), 0, | |
1218 | size - nulls2 - sizeof(void *)); | |
1219 | } | |
1220 | EXPORT_SYMBOL(sk_prot_clear_portaddr_nulls); | |
1221 | ||
2e4afe7b PE |
1222 | static struct sock *sk_prot_alloc(struct proto *prot, gfp_t priority, |
1223 | int family) | |
c308c1b2 PE |
1224 | { |
1225 | struct sock *sk; | |
1226 | struct kmem_cache *slab; | |
1227 | ||
1228 | slab = prot->slab; | |
e912b114 ED |
1229 | if (slab != NULL) { |
1230 | sk = kmem_cache_alloc(slab, priority & ~__GFP_ZERO); | |
1231 | if (!sk) | |
1232 | return sk; | |
1233 | if (priority & __GFP_ZERO) { | |
fcbdf09d OP |
1234 | if (prot->clear_sk) |
1235 | prot->clear_sk(sk, prot->obj_size); | |
1236 | else | |
1237 | sk_prot_clear_nulls(sk, prot->obj_size); | |
e912b114 | 1238 | } |
fcbdf09d | 1239 | } else |
c308c1b2 PE |
1240 | sk = kmalloc(prot->obj_size, priority); |
1241 | ||
2e4afe7b | 1242 | if (sk != NULL) { |
a98b65a3 VN |
1243 | kmemcheck_annotate_bitfield(sk, flags); |
1244 | ||
2e4afe7b PE |
1245 | if (security_sk_alloc(sk, family, priority)) |
1246 | goto out_free; | |
1247 | ||
1248 | if (!try_module_get(prot->owner)) | |
1249 | goto out_free_sec; | |
e022f0b4 | 1250 | sk_tx_queue_clear(sk); |
2e4afe7b PE |
1251 | } |
1252 | ||
c308c1b2 | 1253 | return sk; |
2e4afe7b PE |
1254 | |
1255 | out_free_sec: | |
1256 | security_sk_free(sk); | |
1257 | out_free: | |
1258 | if (slab != NULL) | |
1259 | kmem_cache_free(slab, sk); | |
1260 | else | |
1261 | kfree(sk); | |
1262 | return NULL; | |
c308c1b2 PE |
1263 | } |
1264 | ||
1265 | static void sk_prot_free(struct proto *prot, struct sock *sk) | |
1266 | { | |
1267 | struct kmem_cache *slab; | |
2e4afe7b | 1268 | struct module *owner; |
c308c1b2 | 1269 | |
2e4afe7b | 1270 | owner = prot->owner; |
c308c1b2 | 1271 | slab = prot->slab; |
2e4afe7b PE |
1272 | |
1273 | security_sk_free(sk); | |
c308c1b2 PE |
1274 | if (slab != NULL) |
1275 | kmem_cache_free(slab, sk); | |
1276 | else | |
1277 | kfree(sk); | |
2e4afe7b | 1278 | module_put(owner); |
c308c1b2 PE |
1279 | } |
1280 | ||
f8451725 | 1281 | #ifdef CONFIG_CGROUPS |
8fb974c9 | 1282 | #if IS_ENABLED(CONFIG_NET_CLS_CGROUP) |
fd9a08a7 | 1283 | void sock_update_classid(struct sock *sk, struct task_struct *task) |
f8451725 | 1284 | { |
1144182a | 1285 | u32 classid; |
f8451725 | 1286 | |
fd9a08a7 | 1287 | classid = task_cls_classid(task); |
3afa6d00 | 1288 | if (classid != sk->sk_classid) |
f8451725 HX |
1289 | sk->sk_classid = classid; |
1290 | } | |
82862742 | 1291 | EXPORT_SYMBOL(sock_update_classid); |
8fb974c9 | 1292 | #endif |
5bc1421e | 1293 | |
51e4e7fa | 1294 | #if IS_ENABLED(CONFIG_NETPRIO_CGROUP) |
406a3c63 | 1295 | void sock_update_netprioidx(struct sock *sk, struct task_struct *task) |
5bc1421e | 1296 | { |
5bc1421e NH |
1297 | if (in_interrupt()) |
1298 | return; | |
2b73bc65 | 1299 | |
406a3c63 | 1300 | sk->sk_cgrp_prioidx = task_netprioidx(task); |
5bc1421e NH |
1301 | } |
1302 | EXPORT_SYMBOL_GPL(sock_update_netprioidx); | |
f8451725 | 1303 | #endif |
51e4e7fa | 1304 | #endif |
f8451725 | 1305 | |
1da177e4 LT |
1306 | /** |
1307 | * sk_alloc - All socket objects are allocated here | |
c4ea43c5 | 1308 | * @net: the applicable net namespace |
4dc3b16b PP |
1309 | * @family: protocol family |
1310 | * @priority: for allocation (%GFP_KERNEL, %GFP_ATOMIC, etc) | |
1311 | * @prot: struct proto associated with this new sock instance | |
1da177e4 | 1312 | */ |
1b8d7ae4 | 1313 | struct sock *sk_alloc(struct net *net, int family, gfp_t priority, |
6257ff21 | 1314 | struct proto *prot) |
1da177e4 | 1315 | { |
c308c1b2 | 1316 | struct sock *sk; |
1da177e4 | 1317 | |
154adbc8 | 1318 | sk = sk_prot_alloc(prot, priority | __GFP_ZERO, family); |
1da177e4 | 1319 | if (sk) { |
154adbc8 PE |
1320 | sk->sk_family = family; |
1321 | /* | |
1322 | * See comment in struct sock definition to understand | |
1323 | * why we need sk_prot_creator -acme | |
1324 | */ | |
1325 | sk->sk_prot = sk->sk_prot_creator = prot; | |
1326 | sock_lock_init(sk); | |
3b1e0a65 | 1327 | sock_net_set(sk, get_net(net)); |
d66ee058 | 1328 | atomic_set(&sk->sk_wmem_alloc, 1); |
f8451725 | 1329 | |
fd9a08a7 | 1330 | sock_update_classid(sk, current); |
406a3c63 | 1331 | sock_update_netprioidx(sk, current); |
1da177e4 | 1332 | } |
a79af59e | 1333 | |
2e4afe7b | 1334 | return sk; |
1da177e4 | 1335 | } |
2a91525c | 1336 | EXPORT_SYMBOL(sk_alloc); |
1da177e4 | 1337 | |
2b85a34e | 1338 | static void __sk_free(struct sock *sk) |
1da177e4 LT |
1339 | { |
1340 | struct sk_filter *filter; | |
1da177e4 LT |
1341 | |
1342 | if (sk->sk_destruct) | |
1343 | sk->sk_destruct(sk); | |
1344 | ||
a898def2 PM |
1345 | filter = rcu_dereference_check(sk->sk_filter, |
1346 | atomic_read(&sk->sk_wmem_alloc) == 0); | |
1da177e4 | 1347 | if (filter) { |
309dd5fc | 1348 | sk_filter_uncharge(sk, filter); |
a9b3cd7f | 1349 | RCU_INIT_POINTER(sk->sk_filter, NULL); |
1da177e4 LT |
1350 | } |
1351 | ||
08e29af3 | 1352 | sock_disable_timestamp(sk, SK_FLAGS_TIMESTAMP); |
1da177e4 LT |
1353 | |
1354 | if (atomic_read(&sk->sk_omem_alloc)) | |
e005d193 JP |
1355 | pr_debug("%s: optmem leakage (%d bytes) detected\n", |
1356 | __func__, atomic_read(&sk->sk_omem_alloc)); | |
1da177e4 | 1357 | |
109f6e39 EB |
1358 | if (sk->sk_peer_cred) |
1359 | put_cred(sk->sk_peer_cred); | |
1360 | put_pid(sk->sk_peer_pid); | |
3b1e0a65 | 1361 | put_net(sock_net(sk)); |
c308c1b2 | 1362 | sk_prot_free(sk->sk_prot_creator, sk); |
1da177e4 | 1363 | } |
2b85a34e ED |
1364 | |
1365 | void sk_free(struct sock *sk) | |
1366 | { | |
1367 | /* | |
25985edc | 1368 | * We subtract one from sk_wmem_alloc and can know if |
2b85a34e ED |
1369 | * some packets are still in some tx queue. |
1370 | * If not null, sock_wfree() will call __sk_free(sk) later | |
1371 | */ | |
1372 | if (atomic_dec_and_test(&sk->sk_wmem_alloc)) | |
1373 | __sk_free(sk); | |
1374 | } | |
2a91525c | 1375 | EXPORT_SYMBOL(sk_free); |
1da177e4 | 1376 | |
edf02087 | 1377 | /* |
25985edc LDM |
1378 | * Last sock_put should drop reference to sk->sk_net. It has already |
1379 | * been dropped in sk_change_net. Taking reference to stopping namespace | |
edf02087 | 1380 | * is not an option. |
25985edc | 1381 | * Take reference to a socket to remove it from hash _alive_ and after that |
edf02087 DL |
1382 | * destroy it in the context of init_net. |
1383 | */ | |
1384 | void sk_release_kernel(struct sock *sk) | |
1385 | { | |
1386 | if (sk == NULL || sk->sk_socket == NULL) | |
1387 | return; | |
1388 | ||
1389 | sock_hold(sk); | |
1390 | sock_release(sk->sk_socket); | |
65a18ec5 | 1391 | release_net(sock_net(sk)); |
3b1e0a65 | 1392 | sock_net_set(sk, get_net(&init_net)); |
edf02087 DL |
1393 | sock_put(sk); |
1394 | } | |
45af1754 | 1395 | EXPORT_SYMBOL(sk_release_kernel); |
edf02087 | 1396 | |
475f1b52 SR |
1397 | static void sk_update_clone(const struct sock *sk, struct sock *newsk) |
1398 | { | |
1399 | if (mem_cgroup_sockets_enabled && sk->sk_cgrp) | |
1400 | sock_update_memcg(newsk); | |
1401 | } | |
1402 | ||
e56c57d0 ED |
1403 | /** |
1404 | * sk_clone_lock - clone a socket, and lock its clone | |
1405 | * @sk: the socket to clone | |
1406 | * @priority: for allocation (%GFP_KERNEL, %GFP_ATOMIC, etc) | |
1407 | * | |
1408 | * Caller must unlock socket even in error path (bh_unlock_sock(newsk)) | |
1409 | */ | |
1410 | struct sock *sk_clone_lock(const struct sock *sk, const gfp_t priority) | |
87d11ceb | 1411 | { |
8fd1d178 | 1412 | struct sock *newsk; |
87d11ceb | 1413 | |
8fd1d178 | 1414 | newsk = sk_prot_alloc(sk->sk_prot, priority, sk->sk_family); |
87d11ceb ACM |
1415 | if (newsk != NULL) { |
1416 | struct sk_filter *filter; | |
1417 | ||
892c141e | 1418 | sock_copy(newsk, sk); |
87d11ceb ACM |
1419 | |
1420 | /* SANITY */ | |
3b1e0a65 | 1421 | get_net(sock_net(newsk)); |
87d11ceb ACM |
1422 | sk_node_init(&newsk->sk_node); |
1423 | sock_lock_init(newsk); | |
1424 | bh_lock_sock(newsk); | |
fa438ccf | 1425 | newsk->sk_backlog.head = newsk->sk_backlog.tail = NULL; |
8eae939f | 1426 | newsk->sk_backlog.len = 0; |
87d11ceb ACM |
1427 | |
1428 | atomic_set(&newsk->sk_rmem_alloc, 0); | |
2b85a34e ED |
1429 | /* |
1430 | * sk_wmem_alloc set to one (see sk_free() and sock_wfree()) | |
1431 | */ | |
1432 | atomic_set(&newsk->sk_wmem_alloc, 1); | |
87d11ceb ACM |
1433 | atomic_set(&newsk->sk_omem_alloc, 0); |
1434 | skb_queue_head_init(&newsk->sk_receive_queue); | |
1435 | skb_queue_head_init(&newsk->sk_write_queue); | |
97fc2f08 CL |
1436 | #ifdef CONFIG_NET_DMA |
1437 | skb_queue_head_init(&newsk->sk_async_wait_queue); | |
1438 | #endif | |
87d11ceb | 1439 | |
b6c6712a | 1440 | spin_lock_init(&newsk->sk_dst_lock); |
87d11ceb | 1441 | rwlock_init(&newsk->sk_callback_lock); |
443aef0e PZ |
1442 | lockdep_set_class_and_name(&newsk->sk_callback_lock, |
1443 | af_callback_keys + newsk->sk_family, | |
1444 | af_family_clock_key_strings[newsk->sk_family]); | |
87d11ceb ACM |
1445 | |
1446 | newsk->sk_dst_cache = NULL; | |
1447 | newsk->sk_wmem_queued = 0; | |
1448 | newsk->sk_forward_alloc = 0; | |
1449 | newsk->sk_send_head = NULL; | |
87d11ceb ACM |
1450 | newsk->sk_userlocks = sk->sk_userlocks & ~SOCK_BINDPORT_LOCK; |
1451 | ||
1452 | sock_reset_flag(newsk, SOCK_DONE); | |
1453 | skb_queue_head_init(&newsk->sk_error_queue); | |
1454 | ||
0d7da9dd | 1455 | filter = rcu_dereference_protected(newsk->sk_filter, 1); |
87d11ceb ACM |
1456 | if (filter != NULL) |
1457 | sk_filter_charge(newsk, filter); | |
1458 | ||
1459 | if (unlikely(xfrm_sk_clone_policy(newsk))) { | |
1460 | /* It is still raw copy of parent, so invalidate | |
1461 | * destructor and make plain sk_free() */ | |
1462 | newsk->sk_destruct = NULL; | |
b0691c8e | 1463 | bh_unlock_sock(newsk); |
87d11ceb ACM |
1464 | sk_free(newsk); |
1465 | newsk = NULL; | |
1466 | goto out; | |
1467 | } | |
1468 | ||
1469 | newsk->sk_err = 0; | |
1470 | newsk->sk_priority = 0; | |
4dc6dc71 ED |
1471 | /* |
1472 | * Before updating sk_refcnt, we must commit prior changes to memory | |
1473 | * (Documentation/RCU/rculist_nulls.txt for details) | |
1474 | */ | |
1475 | smp_wmb(); | |
87d11ceb ACM |
1476 | atomic_set(&newsk->sk_refcnt, 2); |
1477 | ||
1478 | /* | |
1479 | * Increment the counter in the same struct proto as the master | |
1480 | * sock (sk_refcnt_debug_inc uses newsk->sk_prot->socks, that | |
1481 | * is the same as sk->sk_prot->socks, as this field was copied | |
1482 | * with memcpy). | |
1483 | * | |
1484 | * This _changes_ the previous behaviour, where | |
1485 | * tcp_create_openreq_child always was incrementing the | |
1486 | * equivalent to tcp_prot->socks (inet_sock_nr), so this have | |
1487 | * to be taken into account in all callers. -acme | |
1488 | */ | |
1489 | sk_refcnt_debug_inc(newsk); | |
972692e0 | 1490 | sk_set_socket(newsk, NULL); |
43815482 | 1491 | newsk->sk_wq = NULL; |
87d11ceb | 1492 | |
f3f511e1 GC |
1493 | sk_update_clone(sk, newsk); |
1494 | ||
87d11ceb | 1495 | if (newsk->sk_prot->sockets_allocated) |
180d8cd9 | 1496 | sk_sockets_allocated_inc(newsk); |
704da560 | 1497 | |
08e29af3 | 1498 | if (newsk->sk_flags & SK_FLAGS_TIMESTAMP) |
704da560 | 1499 | net_enable_timestamp(); |
87d11ceb ACM |
1500 | } |
1501 | out: | |
1502 | return newsk; | |
1503 | } | |
e56c57d0 | 1504 | EXPORT_SYMBOL_GPL(sk_clone_lock); |
87d11ceb | 1505 | |
9958089a AK |
1506 | void sk_setup_caps(struct sock *sk, struct dst_entry *dst) |
1507 | { | |
1508 | __sk_dst_set(sk, dst); | |
1509 | sk->sk_route_caps = dst->dev->features; | |
1510 | if (sk->sk_route_caps & NETIF_F_GSO) | |
4fcd6b99 | 1511 | sk->sk_route_caps |= NETIF_F_GSO_SOFTWARE; |
a465419b | 1512 | sk->sk_route_caps &= ~sk->sk_route_nocaps; |
9958089a | 1513 | if (sk_can_gso(sk)) { |
82cc1a7a | 1514 | if (dst->header_len) { |
9958089a | 1515 | sk->sk_route_caps &= ~NETIF_F_GSO_MASK; |
82cc1a7a | 1516 | } else { |
9958089a | 1517 | sk->sk_route_caps |= NETIF_F_SG | NETIF_F_HW_CSUM; |
82cc1a7a | 1518 | sk->sk_gso_max_size = dst->dev->gso_max_size; |
1485348d | 1519 | sk->sk_gso_max_segs = dst->dev->gso_max_segs; |
82cc1a7a | 1520 | } |
9958089a AK |
1521 | } |
1522 | } | |
1523 | EXPORT_SYMBOL_GPL(sk_setup_caps); | |
1524 | ||
1da177e4 LT |
1525 | /* |
1526 | * Simple resource managers for sockets. | |
1527 | */ | |
1528 | ||
1529 | ||
4ec93edb YH |
1530 | /* |
1531 | * Write buffer destructor automatically called from kfree_skb. | |
1da177e4 LT |
1532 | */ |
1533 | void sock_wfree(struct sk_buff *skb) | |
1534 | { | |
1535 | struct sock *sk = skb->sk; | |
d99927f4 | 1536 | unsigned int len = skb->truesize; |
1da177e4 | 1537 | |
d99927f4 ED |
1538 | if (!sock_flag(sk, SOCK_USE_WRITE_QUEUE)) { |
1539 | /* | |
1540 | * Keep a reference on sk_wmem_alloc, this will be released | |
1541 | * after sk_write_space() call | |
1542 | */ | |
1543 | atomic_sub(len - 1, &sk->sk_wmem_alloc); | |
1da177e4 | 1544 | sk->sk_write_space(sk); |
d99927f4 ED |
1545 | len = 1; |
1546 | } | |
2b85a34e | 1547 | /* |
d99927f4 ED |
1548 | * if sk_wmem_alloc reaches 0, we must finish what sk_free() |
1549 | * could not do because of in-flight packets | |
2b85a34e | 1550 | */ |
d99927f4 | 1551 | if (atomic_sub_and_test(len, &sk->sk_wmem_alloc)) |
2b85a34e | 1552 | __sk_free(sk); |
1da177e4 | 1553 | } |
2a91525c | 1554 | EXPORT_SYMBOL(sock_wfree); |
1da177e4 | 1555 | |
4ec93edb YH |
1556 | /* |
1557 | * Read buffer destructor automatically called from kfree_skb. | |
1da177e4 LT |
1558 | */ |
1559 | void sock_rfree(struct sk_buff *skb) | |
1560 | { | |
1561 | struct sock *sk = skb->sk; | |
d361fd59 | 1562 | unsigned int len = skb->truesize; |
1da177e4 | 1563 | |
d361fd59 ED |
1564 | atomic_sub(len, &sk->sk_rmem_alloc); |
1565 | sk_mem_uncharge(sk, len); | |
1da177e4 | 1566 | } |
2a91525c | 1567 | EXPORT_SYMBOL(sock_rfree); |
1da177e4 | 1568 | |
41063e9d DM |
1569 | void sock_edemux(struct sk_buff *skb) |
1570 | { | |
e812347c ED |
1571 | struct sock *sk = skb->sk; |
1572 | ||
1c463e57 | 1573 | #ifdef CONFIG_INET |
e812347c ED |
1574 | if (sk->sk_state == TCP_TIME_WAIT) |
1575 | inet_twsk_put(inet_twsk(sk)); | |
1576 | else | |
1c463e57 | 1577 | #endif |
e812347c | 1578 | sock_put(sk); |
41063e9d DM |
1579 | } |
1580 | EXPORT_SYMBOL(sock_edemux); | |
1da177e4 | 1581 | |
976d0201 | 1582 | kuid_t sock_i_uid(struct sock *sk) |
1da177e4 | 1583 | { |
976d0201 | 1584 | kuid_t uid; |
1da177e4 | 1585 | |
f064af1e | 1586 | read_lock_bh(&sk->sk_callback_lock); |
976d0201 | 1587 | uid = sk->sk_socket ? SOCK_INODE(sk->sk_socket)->i_uid : GLOBAL_ROOT_UID; |
f064af1e | 1588 | read_unlock_bh(&sk->sk_callback_lock); |
1da177e4 LT |
1589 | return uid; |
1590 | } | |
2a91525c | 1591 | EXPORT_SYMBOL(sock_i_uid); |
1da177e4 LT |
1592 | |
1593 | unsigned long sock_i_ino(struct sock *sk) | |
1594 | { | |
1595 | unsigned long ino; | |
1596 | ||
f064af1e | 1597 | read_lock_bh(&sk->sk_callback_lock); |
1da177e4 | 1598 | ino = sk->sk_socket ? SOCK_INODE(sk->sk_socket)->i_ino : 0; |
f064af1e | 1599 | read_unlock_bh(&sk->sk_callback_lock); |
1da177e4 LT |
1600 | return ino; |
1601 | } | |
2a91525c | 1602 | EXPORT_SYMBOL(sock_i_ino); |
1da177e4 LT |
1603 | |
1604 | /* | |
1605 | * Allocate a skb from the socket's send buffer. | |
1606 | */ | |
86a76caf | 1607 | struct sk_buff *sock_wmalloc(struct sock *sk, unsigned long size, int force, |
dd0fc66f | 1608 | gfp_t priority) |
1da177e4 LT |
1609 | { |
1610 | if (force || atomic_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf) { | |
2a91525c | 1611 | struct sk_buff *skb = alloc_skb(size, priority); |
1da177e4 LT |
1612 | if (skb) { |
1613 | skb_set_owner_w(skb, sk); | |
1614 | return skb; | |
1615 | } | |
1616 | } | |
1617 | return NULL; | |
1618 | } | |
2a91525c | 1619 | EXPORT_SYMBOL(sock_wmalloc); |
1da177e4 LT |
1620 | |
1621 | /* | |
1622 | * Allocate a skb from the socket's receive buffer. | |
4ec93edb | 1623 | */ |
86a76caf | 1624 | struct sk_buff *sock_rmalloc(struct sock *sk, unsigned long size, int force, |
dd0fc66f | 1625 | gfp_t priority) |
1da177e4 LT |
1626 | { |
1627 | if (force || atomic_read(&sk->sk_rmem_alloc) < sk->sk_rcvbuf) { | |
1628 | struct sk_buff *skb = alloc_skb(size, priority); | |
1629 | if (skb) { | |
1630 | skb_set_owner_r(skb, sk); | |
1631 | return skb; | |
1632 | } | |
1633 | } | |
1634 | return NULL; | |
1635 | } | |
1636 | ||
4ec93edb | 1637 | /* |
1da177e4 | 1638 | * Allocate a memory block from the socket's option memory buffer. |
4ec93edb | 1639 | */ |
dd0fc66f | 1640 | void *sock_kmalloc(struct sock *sk, int size, gfp_t priority) |
1da177e4 | 1641 | { |
95c96174 | 1642 | if ((unsigned int)size <= sysctl_optmem_max && |
1da177e4 LT |
1643 | atomic_read(&sk->sk_omem_alloc) + size < sysctl_optmem_max) { |
1644 | void *mem; | |
1645 | /* First do the add, to avoid the race if kmalloc | |
4ec93edb | 1646 | * might sleep. |
1da177e4 LT |
1647 | */ |
1648 | atomic_add(size, &sk->sk_omem_alloc); | |
1649 | mem = kmalloc(size, priority); | |
1650 | if (mem) | |
1651 | return mem; | |
1652 | atomic_sub(size, &sk->sk_omem_alloc); | |
1653 | } | |
1654 | return NULL; | |
1655 | } | |
2a91525c | 1656 | EXPORT_SYMBOL(sock_kmalloc); |
1da177e4 LT |
1657 | |
1658 | /* | |
1659 | * Free an option memory block. | |
1660 | */ | |
1661 | void sock_kfree_s(struct sock *sk, void *mem, int size) | |
1662 | { | |
1663 | kfree(mem); | |
1664 | atomic_sub(size, &sk->sk_omem_alloc); | |
1665 | } | |
2a91525c | 1666 | EXPORT_SYMBOL(sock_kfree_s); |
1da177e4 LT |
1667 | |
1668 | /* It is almost wait_for_tcp_memory minus release_sock/lock_sock. | |
1669 | I think, these locks should be removed for datagram sockets. | |
1670 | */ | |
2a91525c | 1671 | static long sock_wait_for_wmem(struct sock *sk, long timeo) |
1da177e4 LT |
1672 | { |
1673 | DEFINE_WAIT(wait); | |
1674 | ||
1675 | clear_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags); | |
1676 | for (;;) { | |
1677 | if (!timeo) | |
1678 | break; | |
1679 | if (signal_pending(current)) | |
1680 | break; | |
1681 | set_bit(SOCK_NOSPACE, &sk->sk_socket->flags); | |
aa395145 | 1682 | prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE); |
1da177e4 LT |
1683 | if (atomic_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf) |
1684 | break; | |
1685 | if (sk->sk_shutdown & SEND_SHUTDOWN) | |
1686 | break; | |
1687 | if (sk->sk_err) | |
1688 | break; | |
1689 | timeo = schedule_timeout(timeo); | |
1690 | } | |
aa395145 | 1691 | finish_wait(sk_sleep(sk), &wait); |
1da177e4 LT |
1692 | return timeo; |
1693 | } | |
1694 | ||
1695 | ||
1696 | /* | |
1697 | * Generic send/receive buffer handlers | |
1698 | */ | |
1699 | ||
4cc7f68d HX |
1700 | struct sk_buff *sock_alloc_send_pskb(struct sock *sk, unsigned long header_len, |
1701 | unsigned long data_len, int noblock, | |
1702 | int *errcode) | |
1da177e4 LT |
1703 | { |
1704 | struct sk_buff *skb; | |
7d877f3b | 1705 | gfp_t gfp_mask; |
1da177e4 LT |
1706 | long timeo; |
1707 | int err; | |
cc9b17ad JW |
1708 | int npages = (data_len + (PAGE_SIZE - 1)) >> PAGE_SHIFT; |
1709 | ||
1710 | err = -EMSGSIZE; | |
1711 | if (npages > MAX_SKB_FRAGS) | |
1712 | goto failure; | |
1da177e4 LT |
1713 | |
1714 | gfp_mask = sk->sk_allocation; | |
1715 | if (gfp_mask & __GFP_WAIT) | |
1716 | gfp_mask |= __GFP_REPEAT; | |
1717 | ||
1718 | timeo = sock_sndtimeo(sk, noblock); | |
1719 | while (1) { | |
1720 | err = sock_error(sk); | |
1721 | if (err != 0) | |
1722 | goto failure; | |
1723 | ||
1724 | err = -EPIPE; | |
1725 | if (sk->sk_shutdown & SEND_SHUTDOWN) | |
1726 | goto failure; | |
1727 | ||
1728 | if (atomic_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf) { | |
db38c179 | 1729 | skb = alloc_skb(header_len, gfp_mask); |
1da177e4 | 1730 | if (skb) { |
1da177e4 LT |
1731 | int i; |
1732 | ||
1733 | /* No pages, we're done... */ | |
1734 | if (!data_len) | |
1735 | break; | |
1736 | ||
1da177e4 LT |
1737 | skb->truesize += data_len; |
1738 | skb_shinfo(skb)->nr_frags = npages; | |
1739 | for (i = 0; i < npages; i++) { | |
1740 | struct page *page; | |
1da177e4 LT |
1741 | |
1742 | page = alloc_pages(sk->sk_allocation, 0); | |
1743 | if (!page) { | |
1744 | err = -ENOBUFS; | |
1745 | skb_shinfo(skb)->nr_frags = i; | |
1746 | kfree_skb(skb); | |
1747 | goto failure; | |
1748 | } | |
1749 | ||
ea2ab693 IC |
1750 | __skb_fill_page_desc(skb, i, |
1751 | page, 0, | |
1752 | (data_len >= PAGE_SIZE ? | |
1753 | PAGE_SIZE : | |
1754 | data_len)); | |
1da177e4 LT |
1755 | data_len -= PAGE_SIZE; |
1756 | } | |
1757 | ||
1758 | /* Full success... */ | |
1759 | break; | |
1760 | } | |
1761 | err = -ENOBUFS; | |
1762 | goto failure; | |
1763 | } | |
1764 | set_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags); | |
1765 | set_bit(SOCK_NOSPACE, &sk->sk_socket->flags); | |
1766 | err = -EAGAIN; | |
1767 | if (!timeo) | |
1768 | goto failure; | |
1769 | if (signal_pending(current)) | |
1770 | goto interrupted; | |
1771 | timeo = sock_wait_for_wmem(sk, timeo); | |
1772 | } | |
1773 | ||
1774 | skb_set_owner_w(skb, sk); | |
1775 | return skb; | |
1776 | ||
1777 | interrupted: | |
1778 | err = sock_intr_errno(timeo); | |
1779 | failure: | |
1780 | *errcode = err; | |
1781 | return NULL; | |
1782 | } | |
4cc7f68d | 1783 | EXPORT_SYMBOL(sock_alloc_send_pskb); |
1da177e4 | 1784 | |
4ec93edb | 1785 | struct sk_buff *sock_alloc_send_skb(struct sock *sk, unsigned long size, |
1da177e4 LT |
1786 | int noblock, int *errcode) |
1787 | { | |
1788 | return sock_alloc_send_pskb(sk, size, 0, noblock, errcode); | |
1789 | } | |
2a91525c | 1790 | EXPORT_SYMBOL(sock_alloc_send_skb); |
1da177e4 | 1791 | |
5640f768 ED |
1792 | /* On 32bit arches, an skb frag is limited to 2^15 */ |
1793 | #define SKB_FRAG_PAGE_ORDER get_order(32768) | |
1794 | ||
1795 | bool sk_page_frag_refill(struct sock *sk, struct page_frag *pfrag) | |
1796 | { | |
1797 | int order; | |
1798 | ||
1799 | if (pfrag->page) { | |
1800 | if (atomic_read(&pfrag->page->_count) == 1) { | |
1801 | pfrag->offset = 0; | |
1802 | return true; | |
1803 | } | |
1804 | if (pfrag->offset < pfrag->size) | |
1805 | return true; | |
1806 | put_page(pfrag->page); | |
1807 | } | |
1808 | ||
1809 | /* We restrict high order allocations to users that can afford to wait */ | |
1810 | order = (sk->sk_allocation & __GFP_WAIT) ? SKB_FRAG_PAGE_ORDER : 0; | |
1811 | ||
1812 | do { | |
1813 | gfp_t gfp = sk->sk_allocation; | |
1814 | ||
1815 | if (order) | |
1816 | gfp |= __GFP_COMP | __GFP_NOWARN; | |
1817 | pfrag->page = alloc_pages(gfp, order); | |
1818 | if (likely(pfrag->page)) { | |
1819 | pfrag->offset = 0; | |
1820 | pfrag->size = PAGE_SIZE << order; | |
1821 | return true; | |
1822 | } | |
1823 | } while (--order >= 0); | |
1824 | ||
1825 | sk_enter_memory_pressure(sk); | |
1826 | sk_stream_moderate_sndbuf(sk); | |
1827 | return false; | |
1828 | } | |
1829 | EXPORT_SYMBOL(sk_page_frag_refill); | |
1830 | ||
1da177e4 | 1831 | static void __lock_sock(struct sock *sk) |
f39234d6 NK |
1832 | __releases(&sk->sk_lock.slock) |
1833 | __acquires(&sk->sk_lock.slock) | |
1da177e4 LT |
1834 | { |
1835 | DEFINE_WAIT(wait); | |
1836 | ||
e71a4783 | 1837 | for (;;) { |
1da177e4 LT |
1838 | prepare_to_wait_exclusive(&sk->sk_lock.wq, &wait, |
1839 | TASK_UNINTERRUPTIBLE); | |
1840 | spin_unlock_bh(&sk->sk_lock.slock); | |
1841 | schedule(); | |
1842 | spin_lock_bh(&sk->sk_lock.slock); | |
e71a4783 | 1843 | if (!sock_owned_by_user(sk)) |
1da177e4 LT |
1844 | break; |
1845 | } | |
1846 | finish_wait(&sk->sk_lock.wq, &wait); | |
1847 | } | |
1848 | ||
1849 | static void __release_sock(struct sock *sk) | |
f39234d6 NK |
1850 | __releases(&sk->sk_lock.slock) |
1851 | __acquires(&sk->sk_lock.slock) | |
1da177e4 LT |
1852 | { |
1853 | struct sk_buff *skb = sk->sk_backlog.head; | |
1854 | ||
1855 | do { | |
1856 | sk->sk_backlog.head = sk->sk_backlog.tail = NULL; | |
1857 | bh_unlock_sock(sk); | |
1858 | ||
1859 | do { | |
1860 | struct sk_buff *next = skb->next; | |
1861 | ||
e4cbb02a | 1862 | prefetch(next); |
7fee226a | 1863 | WARN_ON_ONCE(skb_dst_is_noref(skb)); |
1da177e4 | 1864 | skb->next = NULL; |
c57943a1 | 1865 | sk_backlog_rcv(sk, skb); |
1da177e4 LT |
1866 | |
1867 | /* | |
1868 | * We are in process context here with softirqs | |
1869 | * disabled, use cond_resched_softirq() to preempt. | |
1870 | * This is safe to do because we've taken the backlog | |
1871 | * queue private: | |
1872 | */ | |
1873 | cond_resched_softirq(); | |
1874 | ||
1875 | skb = next; | |
1876 | } while (skb != NULL); | |
1877 | ||
1878 | bh_lock_sock(sk); | |
e71a4783 | 1879 | } while ((skb = sk->sk_backlog.head) != NULL); |
8eae939f ZY |
1880 | |
1881 | /* | |
1882 | * Doing the zeroing here guarantee we can not loop forever | |
1883 | * while a wild producer attempts to flood us. | |
1884 | */ | |
1885 | sk->sk_backlog.len = 0; | |
1da177e4 LT |
1886 | } |
1887 | ||
1888 | /** | |
1889 | * sk_wait_data - wait for data to arrive at sk_receive_queue | |
4dc3b16b PP |
1890 | * @sk: sock to wait on |
1891 | * @timeo: for how long | |
1da177e4 LT |
1892 | * |
1893 | * Now socket state including sk->sk_err is changed only under lock, | |
1894 | * hence we may omit checks after joining wait queue. | |
1895 | * We check receive queue before schedule() only as optimization; | |
1896 | * it is very likely that release_sock() added new data. | |
1897 | */ | |
1898 | int sk_wait_data(struct sock *sk, long *timeo) | |
1899 | { | |
1900 | int rc; | |
1901 | DEFINE_WAIT(wait); | |
1902 | ||
aa395145 | 1903 | prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE); |
1da177e4 LT |
1904 | set_bit(SOCK_ASYNC_WAITDATA, &sk->sk_socket->flags); |
1905 | rc = sk_wait_event(sk, timeo, !skb_queue_empty(&sk->sk_receive_queue)); | |
1906 | clear_bit(SOCK_ASYNC_WAITDATA, &sk->sk_socket->flags); | |
aa395145 | 1907 | finish_wait(sk_sleep(sk), &wait); |
1da177e4 LT |
1908 | return rc; |
1909 | } | |
1da177e4 LT |
1910 | EXPORT_SYMBOL(sk_wait_data); |
1911 | ||
3ab224be HA |
1912 | /** |
1913 | * __sk_mem_schedule - increase sk_forward_alloc and memory_allocated | |
1914 | * @sk: socket | |
1915 | * @size: memory size to allocate | |
1916 | * @kind: allocation type | |
1917 | * | |
1918 | * If kind is SK_MEM_SEND, it means wmem allocation. Otherwise it means | |
1919 | * rmem allocation. This function assumes that protocols which have | |
1920 | * memory_pressure use sk_wmem_queued as write buffer accounting. | |
1921 | */ | |
1922 | int __sk_mem_schedule(struct sock *sk, int size, int kind) | |
1923 | { | |
1924 | struct proto *prot = sk->sk_prot; | |
1925 | int amt = sk_mem_pages(size); | |
8d987e5c | 1926 | long allocated; |
e1aab161 | 1927 | int parent_status = UNDER_LIMIT; |
3ab224be HA |
1928 | |
1929 | sk->sk_forward_alloc += amt * SK_MEM_QUANTUM; | |
180d8cd9 | 1930 | |
e1aab161 | 1931 | allocated = sk_memory_allocated_add(sk, amt, &parent_status); |
3ab224be HA |
1932 | |
1933 | /* Under limit. */ | |
e1aab161 GC |
1934 | if (parent_status == UNDER_LIMIT && |
1935 | allocated <= sk_prot_mem_limits(sk, 0)) { | |
180d8cd9 | 1936 | sk_leave_memory_pressure(sk); |
3ab224be HA |
1937 | return 1; |
1938 | } | |
1939 | ||
e1aab161 GC |
1940 | /* Under pressure. (we or our parents) */ |
1941 | if ((parent_status > SOFT_LIMIT) || | |
1942 | allocated > sk_prot_mem_limits(sk, 1)) | |
180d8cd9 | 1943 | sk_enter_memory_pressure(sk); |
3ab224be | 1944 | |
e1aab161 GC |
1945 | /* Over hard limit (we or our parents) */ |
1946 | if ((parent_status == OVER_LIMIT) || | |
1947 | (allocated > sk_prot_mem_limits(sk, 2))) | |
3ab224be HA |
1948 | goto suppress_allocation; |
1949 | ||
1950 | /* guarantee minimum buffer size under pressure */ | |
1951 | if (kind == SK_MEM_RECV) { | |
1952 | if (atomic_read(&sk->sk_rmem_alloc) < prot->sysctl_rmem[0]) | |
1953 | return 1; | |
180d8cd9 | 1954 | |
3ab224be HA |
1955 | } else { /* SK_MEM_SEND */ |
1956 | if (sk->sk_type == SOCK_STREAM) { | |
1957 | if (sk->sk_wmem_queued < prot->sysctl_wmem[0]) | |
1958 | return 1; | |
1959 | } else if (atomic_read(&sk->sk_wmem_alloc) < | |
1960 | prot->sysctl_wmem[0]) | |
1961 | return 1; | |
1962 | } | |
1963 | ||
180d8cd9 | 1964 | if (sk_has_memory_pressure(sk)) { |
1748376b ED |
1965 | int alloc; |
1966 | ||
180d8cd9 | 1967 | if (!sk_under_memory_pressure(sk)) |
1748376b | 1968 | return 1; |
180d8cd9 GC |
1969 | alloc = sk_sockets_allocated_read_positive(sk); |
1970 | if (sk_prot_mem_limits(sk, 2) > alloc * | |
3ab224be HA |
1971 | sk_mem_pages(sk->sk_wmem_queued + |
1972 | atomic_read(&sk->sk_rmem_alloc) + | |
1973 | sk->sk_forward_alloc)) | |
1974 | return 1; | |
1975 | } | |
1976 | ||
1977 | suppress_allocation: | |
1978 | ||
1979 | if (kind == SK_MEM_SEND && sk->sk_type == SOCK_STREAM) { | |
1980 | sk_stream_moderate_sndbuf(sk); | |
1981 | ||
1982 | /* Fail only if socket is _under_ its sndbuf. | |
1983 | * In this case we cannot block, so that we have to fail. | |
1984 | */ | |
1985 | if (sk->sk_wmem_queued + size >= sk->sk_sndbuf) | |
1986 | return 1; | |
1987 | } | |
1988 | ||
3847ce32 SM |
1989 | trace_sock_exceed_buf_limit(sk, prot, allocated); |
1990 | ||
3ab224be HA |
1991 | /* Alas. Undo changes. */ |
1992 | sk->sk_forward_alloc -= amt * SK_MEM_QUANTUM; | |
180d8cd9 | 1993 | |
0e90b31f | 1994 | sk_memory_allocated_sub(sk, amt); |
180d8cd9 | 1995 | |
3ab224be HA |
1996 | return 0; |
1997 | } | |
3ab224be HA |
1998 | EXPORT_SYMBOL(__sk_mem_schedule); |
1999 | ||
2000 | /** | |
2001 | * __sk_reclaim - reclaim memory_allocated | |
2002 | * @sk: socket | |
2003 | */ | |
2004 | void __sk_mem_reclaim(struct sock *sk) | |
2005 | { | |
180d8cd9 | 2006 | sk_memory_allocated_sub(sk, |
0e90b31f | 2007 | sk->sk_forward_alloc >> SK_MEM_QUANTUM_SHIFT); |
3ab224be HA |
2008 | sk->sk_forward_alloc &= SK_MEM_QUANTUM - 1; |
2009 | ||
180d8cd9 GC |
2010 | if (sk_under_memory_pressure(sk) && |
2011 | (sk_memory_allocated(sk) < sk_prot_mem_limits(sk, 0))) | |
2012 | sk_leave_memory_pressure(sk); | |
3ab224be | 2013 | } |
3ab224be HA |
2014 | EXPORT_SYMBOL(__sk_mem_reclaim); |
2015 | ||
2016 | ||
1da177e4 LT |
2017 | /* |
2018 | * Set of default routines for initialising struct proto_ops when | |
2019 | * the protocol does not support a particular function. In certain | |
2020 | * cases where it makes no sense for a protocol to have a "do nothing" | |
2021 | * function, some default processing is provided. | |
2022 | */ | |
2023 | ||
2024 | int sock_no_bind(struct socket *sock, struct sockaddr *saddr, int len) | |
2025 | { | |
2026 | return -EOPNOTSUPP; | |
2027 | } | |
2a91525c | 2028 | EXPORT_SYMBOL(sock_no_bind); |
1da177e4 | 2029 | |
4ec93edb | 2030 | int sock_no_connect(struct socket *sock, struct sockaddr *saddr, |
1da177e4 LT |
2031 | int len, int flags) |
2032 | { | |
2033 | return -EOPNOTSUPP; | |
2034 | } | |
2a91525c | 2035 | EXPORT_SYMBOL(sock_no_connect); |
1da177e4 LT |
2036 | |
2037 | int sock_no_socketpair(struct socket *sock1, struct socket *sock2) | |
2038 | { | |
2039 | return -EOPNOTSUPP; | |
2040 | } | |
2a91525c | 2041 | EXPORT_SYMBOL(sock_no_socketpair); |
1da177e4 LT |
2042 | |
2043 | int sock_no_accept(struct socket *sock, struct socket *newsock, int flags) | |
2044 | { | |
2045 | return -EOPNOTSUPP; | |
2046 | } | |
2a91525c | 2047 | EXPORT_SYMBOL(sock_no_accept); |
1da177e4 | 2048 | |
4ec93edb | 2049 | int sock_no_getname(struct socket *sock, struct sockaddr *saddr, |
1da177e4 LT |
2050 | int *len, int peer) |
2051 | { | |
2052 | return -EOPNOTSUPP; | |
2053 | } | |
2a91525c | 2054 | EXPORT_SYMBOL(sock_no_getname); |
1da177e4 | 2055 | |
2a91525c | 2056 | unsigned int sock_no_poll(struct file *file, struct socket *sock, poll_table *pt) |
1da177e4 LT |
2057 | { |
2058 | return 0; | |
2059 | } | |
2a91525c | 2060 | EXPORT_SYMBOL(sock_no_poll); |
1da177e4 LT |
2061 | |
2062 | int sock_no_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg) | |
2063 | { | |
2064 | return -EOPNOTSUPP; | |
2065 | } | |
2a91525c | 2066 | EXPORT_SYMBOL(sock_no_ioctl); |
1da177e4 LT |
2067 | |
2068 | int sock_no_listen(struct socket *sock, int backlog) | |
2069 | { | |
2070 | return -EOPNOTSUPP; | |
2071 | } | |
2a91525c | 2072 | EXPORT_SYMBOL(sock_no_listen); |
1da177e4 LT |
2073 | |
2074 | int sock_no_shutdown(struct socket *sock, int how) | |
2075 | { | |
2076 | return -EOPNOTSUPP; | |
2077 | } | |
2a91525c | 2078 | EXPORT_SYMBOL(sock_no_shutdown); |
1da177e4 LT |
2079 | |
2080 | int sock_no_setsockopt(struct socket *sock, int level, int optname, | |
b7058842 | 2081 | char __user *optval, unsigned int optlen) |
1da177e4 LT |
2082 | { |
2083 | return -EOPNOTSUPP; | |
2084 | } | |
2a91525c | 2085 | EXPORT_SYMBOL(sock_no_setsockopt); |
1da177e4 LT |
2086 | |
2087 | int sock_no_getsockopt(struct socket *sock, int level, int optname, | |
2088 | char __user *optval, int __user *optlen) | |
2089 | { | |
2090 | return -EOPNOTSUPP; | |
2091 | } | |
2a91525c | 2092 | EXPORT_SYMBOL(sock_no_getsockopt); |
1da177e4 LT |
2093 | |
2094 | int sock_no_sendmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *m, | |
2095 | size_t len) | |
2096 | { | |
2097 | return -EOPNOTSUPP; | |
2098 | } | |
2a91525c | 2099 | EXPORT_SYMBOL(sock_no_sendmsg); |
1da177e4 LT |
2100 | |
2101 | int sock_no_recvmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *m, | |
2102 | size_t len, int flags) | |
2103 | { | |
2104 | return -EOPNOTSUPP; | |
2105 | } | |
2a91525c | 2106 | EXPORT_SYMBOL(sock_no_recvmsg); |
1da177e4 LT |
2107 | |
2108 | int sock_no_mmap(struct file *file, struct socket *sock, struct vm_area_struct *vma) | |
2109 | { | |
2110 | /* Mirror missing mmap method error code */ | |
2111 | return -ENODEV; | |
2112 | } | |
2a91525c | 2113 | EXPORT_SYMBOL(sock_no_mmap); |
1da177e4 LT |
2114 | |
2115 | ssize_t sock_no_sendpage(struct socket *sock, struct page *page, int offset, size_t size, int flags) | |
2116 | { | |
2117 | ssize_t res; | |
2118 | struct msghdr msg = {.msg_flags = flags}; | |
2119 | struct kvec iov; | |
2120 | char *kaddr = kmap(page); | |
2121 | iov.iov_base = kaddr + offset; | |
2122 | iov.iov_len = size; | |
2123 | res = kernel_sendmsg(sock, &msg, &iov, 1, size); | |
2124 | kunmap(page); | |
2125 | return res; | |
2126 | } | |
2a91525c | 2127 | EXPORT_SYMBOL(sock_no_sendpage); |
1da177e4 LT |
2128 | |
2129 | /* | |
2130 | * Default Socket Callbacks | |
2131 | */ | |
2132 | ||
2133 | static void sock_def_wakeup(struct sock *sk) | |
2134 | { | |
43815482 ED |
2135 | struct socket_wq *wq; |
2136 | ||
2137 | rcu_read_lock(); | |
2138 | wq = rcu_dereference(sk->sk_wq); | |
2139 | if (wq_has_sleeper(wq)) | |
2140 | wake_up_interruptible_all(&wq->wait); | |
2141 | rcu_read_unlock(); | |
1da177e4 LT |
2142 | } |
2143 | ||
2144 | static void sock_def_error_report(struct sock *sk) | |
2145 | { | |
43815482 ED |
2146 | struct socket_wq *wq; |
2147 | ||
2148 | rcu_read_lock(); | |
2149 | wq = rcu_dereference(sk->sk_wq); | |
2150 | if (wq_has_sleeper(wq)) | |
2151 | wake_up_interruptible_poll(&wq->wait, POLLERR); | |
8d8ad9d7 | 2152 | sk_wake_async(sk, SOCK_WAKE_IO, POLL_ERR); |
43815482 | 2153 | rcu_read_unlock(); |
1da177e4 LT |
2154 | } |
2155 | ||
2156 | static void sock_def_readable(struct sock *sk, int len) | |
2157 | { | |
43815482 ED |
2158 | struct socket_wq *wq; |
2159 | ||
2160 | rcu_read_lock(); | |
2161 | wq = rcu_dereference(sk->sk_wq); | |
2162 | if (wq_has_sleeper(wq)) | |
2c6607c6 | 2163 | wake_up_interruptible_sync_poll(&wq->wait, POLLIN | POLLPRI | |
37e5540b | 2164 | POLLRDNORM | POLLRDBAND); |
8d8ad9d7 | 2165 | sk_wake_async(sk, SOCK_WAKE_WAITD, POLL_IN); |
43815482 | 2166 | rcu_read_unlock(); |
1da177e4 LT |
2167 | } |
2168 | ||
2169 | static void sock_def_write_space(struct sock *sk) | |
2170 | { | |
43815482 ED |
2171 | struct socket_wq *wq; |
2172 | ||
2173 | rcu_read_lock(); | |
1da177e4 LT |
2174 | |
2175 | /* Do not wake up a writer until he can make "significant" | |
2176 | * progress. --DaveM | |
2177 | */ | |
e71a4783 | 2178 | if ((atomic_read(&sk->sk_wmem_alloc) << 1) <= sk->sk_sndbuf) { |
43815482 ED |
2179 | wq = rcu_dereference(sk->sk_wq); |
2180 | if (wq_has_sleeper(wq)) | |
2181 | wake_up_interruptible_sync_poll(&wq->wait, POLLOUT | | |
37e5540b | 2182 | POLLWRNORM | POLLWRBAND); |
1da177e4 LT |
2183 | |
2184 | /* Should agree with poll, otherwise some programs break */ | |
2185 | if (sock_writeable(sk)) | |
8d8ad9d7 | 2186 | sk_wake_async(sk, SOCK_WAKE_SPACE, POLL_OUT); |
1da177e4 LT |
2187 | } |
2188 | ||
43815482 | 2189 | rcu_read_unlock(); |
1da177e4 LT |
2190 | } |
2191 | ||
2192 | static void sock_def_destruct(struct sock *sk) | |
2193 | { | |
a51482bd | 2194 | kfree(sk->sk_protinfo); |
1da177e4 LT |
2195 | } |
2196 | ||
2197 | void sk_send_sigurg(struct sock *sk) | |
2198 | { | |
2199 | if (sk->sk_socket && sk->sk_socket->file) | |
2200 | if (send_sigurg(&sk->sk_socket->file->f_owner)) | |
8d8ad9d7 | 2201 | sk_wake_async(sk, SOCK_WAKE_URG, POLL_PRI); |
1da177e4 | 2202 | } |
2a91525c | 2203 | EXPORT_SYMBOL(sk_send_sigurg); |
1da177e4 LT |
2204 | |
2205 | void sk_reset_timer(struct sock *sk, struct timer_list* timer, | |
2206 | unsigned long expires) | |
2207 | { | |
2208 | if (!mod_timer(timer, expires)) | |
2209 | sock_hold(sk); | |
2210 | } | |
1da177e4 LT |
2211 | EXPORT_SYMBOL(sk_reset_timer); |
2212 | ||
2213 | void sk_stop_timer(struct sock *sk, struct timer_list* timer) | |
2214 | { | |
2215 | if (timer_pending(timer) && del_timer(timer)) | |
2216 | __sock_put(sk); | |
2217 | } | |
1da177e4 LT |
2218 | EXPORT_SYMBOL(sk_stop_timer); |
2219 | ||
2220 | void sock_init_data(struct socket *sock, struct sock *sk) | |
2221 | { | |
2222 | skb_queue_head_init(&sk->sk_receive_queue); | |
2223 | skb_queue_head_init(&sk->sk_write_queue); | |
2224 | skb_queue_head_init(&sk->sk_error_queue); | |
97fc2f08 CL |
2225 | #ifdef CONFIG_NET_DMA |
2226 | skb_queue_head_init(&sk->sk_async_wait_queue); | |
2227 | #endif | |
1da177e4 LT |
2228 | |
2229 | sk->sk_send_head = NULL; | |
2230 | ||
2231 | init_timer(&sk->sk_timer); | |
4ec93edb | 2232 | |
1da177e4 LT |
2233 | sk->sk_allocation = GFP_KERNEL; |
2234 | sk->sk_rcvbuf = sysctl_rmem_default; | |
2235 | sk->sk_sndbuf = sysctl_wmem_default; | |
2236 | sk->sk_state = TCP_CLOSE; | |
972692e0 | 2237 | sk_set_socket(sk, sock); |
1da177e4 LT |
2238 | |
2239 | sock_set_flag(sk, SOCK_ZAPPED); | |
2240 | ||
e71a4783 | 2241 | if (sock) { |
1da177e4 | 2242 | sk->sk_type = sock->type; |
43815482 | 2243 | sk->sk_wq = sock->wq; |
1da177e4 LT |
2244 | sock->sk = sk; |
2245 | } else | |
43815482 | 2246 | sk->sk_wq = NULL; |
1da177e4 | 2247 | |
b6c6712a | 2248 | spin_lock_init(&sk->sk_dst_lock); |
1da177e4 | 2249 | rwlock_init(&sk->sk_callback_lock); |
443aef0e PZ |
2250 | lockdep_set_class_and_name(&sk->sk_callback_lock, |
2251 | af_callback_keys + sk->sk_family, | |
2252 | af_family_clock_key_strings[sk->sk_family]); | |
1da177e4 LT |
2253 | |
2254 | sk->sk_state_change = sock_def_wakeup; | |
2255 | sk->sk_data_ready = sock_def_readable; | |
2256 | sk->sk_write_space = sock_def_write_space; | |
2257 | sk->sk_error_report = sock_def_error_report; | |
2258 | sk->sk_destruct = sock_def_destruct; | |
2259 | ||
5640f768 ED |
2260 | sk->sk_frag.page = NULL; |
2261 | sk->sk_frag.offset = 0; | |
ef64a54f | 2262 | sk->sk_peek_off = -1; |
1da177e4 | 2263 | |
109f6e39 EB |
2264 | sk->sk_peer_pid = NULL; |
2265 | sk->sk_peer_cred = NULL; | |
1da177e4 LT |
2266 | sk->sk_write_pending = 0; |
2267 | sk->sk_rcvlowat = 1; | |
2268 | sk->sk_rcvtimeo = MAX_SCHEDULE_TIMEOUT; | |
2269 | sk->sk_sndtimeo = MAX_SCHEDULE_TIMEOUT; | |
2270 | ||
f37f0afb | 2271 | sk->sk_stamp = ktime_set(-1L, 0); |
1da177e4 | 2272 | |
4dc6dc71 ED |
2273 | /* |
2274 | * Before updating sk_refcnt, we must commit prior changes to memory | |
2275 | * (Documentation/RCU/rculist_nulls.txt for details) | |
2276 | */ | |
2277 | smp_wmb(); | |
1da177e4 | 2278 | atomic_set(&sk->sk_refcnt, 1); |
33c732c3 | 2279 | atomic_set(&sk->sk_drops, 0); |
1da177e4 | 2280 | } |
2a91525c | 2281 | EXPORT_SYMBOL(sock_init_data); |
1da177e4 | 2282 | |
b5606c2d | 2283 | void lock_sock_nested(struct sock *sk, int subclass) |
1da177e4 LT |
2284 | { |
2285 | might_sleep(); | |
a5b5bb9a | 2286 | spin_lock_bh(&sk->sk_lock.slock); |
d2e9117c | 2287 | if (sk->sk_lock.owned) |
1da177e4 | 2288 | __lock_sock(sk); |
d2e9117c | 2289 | sk->sk_lock.owned = 1; |
a5b5bb9a IM |
2290 | spin_unlock(&sk->sk_lock.slock); |
2291 | /* | |
2292 | * The sk_lock has mutex_lock() semantics here: | |
2293 | */ | |
fcc70d5f | 2294 | mutex_acquire(&sk->sk_lock.dep_map, subclass, 0, _RET_IP_); |
a5b5bb9a | 2295 | local_bh_enable(); |
1da177e4 | 2296 | } |
fcc70d5f | 2297 | EXPORT_SYMBOL(lock_sock_nested); |
1da177e4 | 2298 | |
b5606c2d | 2299 | void release_sock(struct sock *sk) |
1da177e4 | 2300 | { |
a5b5bb9a IM |
2301 | /* |
2302 | * The sk_lock has mutex_unlock() semantics: | |
2303 | */ | |
2304 | mutex_release(&sk->sk_lock.dep_map, 1, _RET_IP_); | |
2305 | ||
2306 | spin_lock_bh(&sk->sk_lock.slock); | |
1da177e4 LT |
2307 | if (sk->sk_backlog.tail) |
2308 | __release_sock(sk); | |
46d3ceab ED |
2309 | |
2310 | if (sk->sk_prot->release_cb) | |
2311 | sk->sk_prot->release_cb(sk); | |
2312 | ||
d2e9117c | 2313 | sk->sk_lock.owned = 0; |
a5b5bb9a IM |
2314 | if (waitqueue_active(&sk->sk_lock.wq)) |
2315 | wake_up(&sk->sk_lock.wq); | |
2316 | spin_unlock_bh(&sk->sk_lock.slock); | |
1da177e4 LT |
2317 | } |
2318 | EXPORT_SYMBOL(release_sock); | |
2319 | ||
8a74ad60 ED |
2320 | /** |
2321 | * lock_sock_fast - fast version of lock_sock | |
2322 | * @sk: socket | |
2323 | * | |
2324 | * This version should be used for very small section, where process wont block | |
2325 | * return false if fast path is taken | |
2326 | * sk_lock.slock locked, owned = 0, BH disabled | |
2327 | * return true if slow path is taken | |
2328 | * sk_lock.slock unlocked, owned = 1, BH enabled | |
2329 | */ | |
2330 | bool lock_sock_fast(struct sock *sk) | |
2331 | { | |
2332 | might_sleep(); | |
2333 | spin_lock_bh(&sk->sk_lock.slock); | |
2334 | ||
2335 | if (!sk->sk_lock.owned) | |
2336 | /* | |
2337 | * Note : We must disable BH | |
2338 | */ | |
2339 | return false; | |
2340 | ||
2341 | __lock_sock(sk); | |
2342 | sk->sk_lock.owned = 1; | |
2343 | spin_unlock(&sk->sk_lock.slock); | |
2344 | /* | |
2345 | * The sk_lock has mutex_lock() semantics here: | |
2346 | */ | |
2347 | mutex_acquire(&sk->sk_lock.dep_map, 0, 0, _RET_IP_); | |
2348 | local_bh_enable(); | |
2349 | return true; | |
2350 | } | |
2351 | EXPORT_SYMBOL(lock_sock_fast); | |
2352 | ||
1da177e4 | 2353 | int sock_get_timestamp(struct sock *sk, struct timeval __user *userstamp) |
4ec93edb | 2354 | { |
b7aa0bf7 | 2355 | struct timeval tv; |
1da177e4 | 2356 | if (!sock_flag(sk, SOCK_TIMESTAMP)) |
20d49473 | 2357 | sock_enable_timestamp(sk, SOCK_TIMESTAMP); |
b7aa0bf7 ED |
2358 | tv = ktime_to_timeval(sk->sk_stamp); |
2359 | if (tv.tv_sec == -1) | |
1da177e4 | 2360 | return -ENOENT; |
b7aa0bf7 ED |
2361 | if (tv.tv_sec == 0) { |
2362 | sk->sk_stamp = ktime_get_real(); | |
2363 | tv = ktime_to_timeval(sk->sk_stamp); | |
2364 | } | |
2365 | return copy_to_user(userstamp, &tv, sizeof(tv)) ? -EFAULT : 0; | |
4ec93edb | 2366 | } |
1da177e4 LT |
2367 | EXPORT_SYMBOL(sock_get_timestamp); |
2368 | ||
ae40eb1e ED |
2369 | int sock_get_timestampns(struct sock *sk, struct timespec __user *userstamp) |
2370 | { | |
2371 | struct timespec ts; | |
2372 | if (!sock_flag(sk, SOCK_TIMESTAMP)) | |
20d49473 | 2373 | sock_enable_timestamp(sk, SOCK_TIMESTAMP); |
ae40eb1e ED |
2374 | ts = ktime_to_timespec(sk->sk_stamp); |
2375 | if (ts.tv_sec == -1) | |
2376 | return -ENOENT; | |
2377 | if (ts.tv_sec == 0) { | |
2378 | sk->sk_stamp = ktime_get_real(); | |
2379 | ts = ktime_to_timespec(sk->sk_stamp); | |
2380 | } | |
2381 | return copy_to_user(userstamp, &ts, sizeof(ts)) ? -EFAULT : 0; | |
2382 | } | |
2383 | EXPORT_SYMBOL(sock_get_timestampns); | |
2384 | ||
20d49473 | 2385 | void sock_enable_timestamp(struct sock *sk, int flag) |
4ec93edb | 2386 | { |
20d49473 | 2387 | if (!sock_flag(sk, flag)) { |
08e29af3 ED |
2388 | unsigned long previous_flags = sk->sk_flags; |
2389 | ||
20d49473 PO |
2390 | sock_set_flag(sk, flag); |
2391 | /* | |
2392 | * we just set one of the two flags which require net | |
2393 | * time stamping, but time stamping might have been on | |
2394 | * already because of the other one | |
2395 | */ | |
08e29af3 | 2396 | if (!(previous_flags & SK_FLAGS_TIMESTAMP)) |
20d49473 | 2397 | net_enable_timestamp(); |
1da177e4 LT |
2398 | } |
2399 | } | |
1da177e4 LT |
2400 | |
2401 | /* | |
2402 | * Get a socket option on an socket. | |
2403 | * | |
2404 | * FIX: POSIX 1003.1g is very ambiguous here. It states that | |
2405 | * asynchronous errors should be reported by getsockopt. We assume | |
2406 | * this means if you specify SO_ERROR (otherwise whats the point of it). | |
2407 | */ | |
2408 | int sock_common_getsockopt(struct socket *sock, int level, int optname, | |
2409 | char __user *optval, int __user *optlen) | |
2410 | { | |
2411 | struct sock *sk = sock->sk; | |
2412 | ||
2413 | return sk->sk_prot->getsockopt(sk, level, optname, optval, optlen); | |
2414 | } | |
1da177e4 LT |
2415 | EXPORT_SYMBOL(sock_common_getsockopt); |
2416 | ||
3fdadf7d | 2417 | #ifdef CONFIG_COMPAT |
543d9cfe ACM |
2418 | int compat_sock_common_getsockopt(struct socket *sock, int level, int optname, |
2419 | char __user *optval, int __user *optlen) | |
3fdadf7d DM |
2420 | { |
2421 | struct sock *sk = sock->sk; | |
2422 | ||
1e51f951 | 2423 | if (sk->sk_prot->compat_getsockopt != NULL) |
543d9cfe ACM |
2424 | return sk->sk_prot->compat_getsockopt(sk, level, optname, |
2425 | optval, optlen); | |
3fdadf7d DM |
2426 | return sk->sk_prot->getsockopt(sk, level, optname, optval, optlen); |
2427 | } | |
2428 | EXPORT_SYMBOL(compat_sock_common_getsockopt); | |
2429 | #endif | |
2430 | ||
1da177e4 LT |
2431 | int sock_common_recvmsg(struct kiocb *iocb, struct socket *sock, |
2432 | struct msghdr *msg, size_t size, int flags) | |
2433 | { | |
2434 | struct sock *sk = sock->sk; | |
2435 | int addr_len = 0; | |
2436 | int err; | |
2437 | ||
2438 | err = sk->sk_prot->recvmsg(iocb, sk, msg, size, flags & MSG_DONTWAIT, | |
2439 | flags & ~MSG_DONTWAIT, &addr_len); | |
2440 | if (err >= 0) | |
2441 | msg->msg_namelen = addr_len; | |
2442 | return err; | |
2443 | } | |
1da177e4 LT |
2444 | EXPORT_SYMBOL(sock_common_recvmsg); |
2445 | ||
2446 | /* | |
2447 | * Set socket options on an inet socket. | |
2448 | */ | |
2449 | int sock_common_setsockopt(struct socket *sock, int level, int optname, | |
b7058842 | 2450 | char __user *optval, unsigned int optlen) |
1da177e4 LT |
2451 | { |
2452 | struct sock *sk = sock->sk; | |
2453 | ||
2454 | return sk->sk_prot->setsockopt(sk, level, optname, optval, optlen); | |
2455 | } | |
1da177e4 LT |
2456 | EXPORT_SYMBOL(sock_common_setsockopt); |
2457 | ||
3fdadf7d | 2458 | #ifdef CONFIG_COMPAT |
543d9cfe | 2459 | int compat_sock_common_setsockopt(struct socket *sock, int level, int optname, |
b7058842 | 2460 | char __user *optval, unsigned int optlen) |
3fdadf7d DM |
2461 | { |
2462 | struct sock *sk = sock->sk; | |
2463 | ||
543d9cfe ACM |
2464 | if (sk->sk_prot->compat_setsockopt != NULL) |
2465 | return sk->sk_prot->compat_setsockopt(sk, level, optname, | |
2466 | optval, optlen); | |
3fdadf7d DM |
2467 | return sk->sk_prot->setsockopt(sk, level, optname, optval, optlen); |
2468 | } | |
2469 | EXPORT_SYMBOL(compat_sock_common_setsockopt); | |
2470 | #endif | |
2471 | ||
1da177e4 LT |
2472 | void sk_common_release(struct sock *sk) |
2473 | { | |
2474 | if (sk->sk_prot->destroy) | |
2475 | sk->sk_prot->destroy(sk); | |
2476 | ||
2477 | /* | |
2478 | * Observation: when sock_common_release is called, processes have | |
2479 | * no access to socket. But net still has. | |
2480 | * Step one, detach it from networking: | |
2481 | * | |
2482 | * A. Remove from hash tables. | |
2483 | */ | |
2484 | ||
2485 | sk->sk_prot->unhash(sk); | |
2486 | ||
2487 | /* | |
2488 | * In this point socket cannot receive new packets, but it is possible | |
2489 | * that some packets are in flight because some CPU runs receiver and | |
2490 | * did hash table lookup before we unhashed socket. They will achieve | |
2491 | * receive queue and will be purged by socket destructor. | |
2492 | * | |
2493 | * Also we still have packets pending on receive queue and probably, | |
2494 | * our own packets waiting in device queues. sock_destroy will drain | |
2495 | * receive queue, but transmitted packets will delay socket destruction | |
2496 | * until the last reference will be released. | |
2497 | */ | |
2498 | ||
2499 | sock_orphan(sk); | |
2500 | ||
2501 | xfrm_sk_free_policy(sk); | |
2502 | ||
e6848976 | 2503 | sk_refcnt_debug_release(sk); |
5640f768 ED |
2504 | |
2505 | if (sk->sk_frag.page) { | |
2506 | put_page(sk->sk_frag.page); | |
2507 | sk->sk_frag.page = NULL; | |
2508 | } | |
2509 | ||
1da177e4 LT |
2510 | sock_put(sk); |
2511 | } | |
1da177e4 LT |
2512 | EXPORT_SYMBOL(sk_common_release); |
2513 | ||
13ff3d6f PE |
2514 | #ifdef CONFIG_PROC_FS |
2515 | #define PROTO_INUSE_NR 64 /* should be enough for the first time */ | |
1338d466 PE |
2516 | struct prot_inuse { |
2517 | int val[PROTO_INUSE_NR]; | |
2518 | }; | |
13ff3d6f PE |
2519 | |
2520 | static DECLARE_BITMAP(proto_inuse_idx, PROTO_INUSE_NR); | |
70ee1159 PE |
2521 | |
2522 | #ifdef CONFIG_NET_NS | |
2523 | void sock_prot_inuse_add(struct net *net, struct proto *prot, int val) | |
2524 | { | |
d6d9ca0f | 2525 | __this_cpu_add(net->core.inuse->val[prot->inuse_idx], val); |
70ee1159 PE |
2526 | } |
2527 | EXPORT_SYMBOL_GPL(sock_prot_inuse_add); | |
2528 | ||
2529 | int sock_prot_inuse_get(struct net *net, struct proto *prot) | |
2530 | { | |
2531 | int cpu, idx = prot->inuse_idx; | |
2532 | int res = 0; | |
2533 | ||
2534 | for_each_possible_cpu(cpu) | |
2535 | res += per_cpu_ptr(net->core.inuse, cpu)->val[idx]; | |
2536 | ||
2537 | return res >= 0 ? res : 0; | |
2538 | } | |
2539 | EXPORT_SYMBOL_GPL(sock_prot_inuse_get); | |
2540 | ||
2c8c1e72 | 2541 | static int __net_init sock_inuse_init_net(struct net *net) |
70ee1159 PE |
2542 | { |
2543 | net->core.inuse = alloc_percpu(struct prot_inuse); | |
2544 | return net->core.inuse ? 0 : -ENOMEM; | |
2545 | } | |
2546 | ||
2c8c1e72 | 2547 | static void __net_exit sock_inuse_exit_net(struct net *net) |
70ee1159 PE |
2548 | { |
2549 | free_percpu(net->core.inuse); | |
2550 | } | |
2551 | ||
2552 | static struct pernet_operations net_inuse_ops = { | |
2553 | .init = sock_inuse_init_net, | |
2554 | .exit = sock_inuse_exit_net, | |
2555 | }; | |
2556 | ||
2557 | static __init int net_inuse_init(void) | |
2558 | { | |
2559 | if (register_pernet_subsys(&net_inuse_ops)) | |
2560 | panic("Cannot initialize net inuse counters"); | |
2561 | ||
2562 | return 0; | |
2563 | } | |
2564 | ||
2565 | core_initcall(net_inuse_init); | |
2566 | #else | |
1338d466 PE |
2567 | static DEFINE_PER_CPU(struct prot_inuse, prot_inuse); |
2568 | ||
c29a0bc4 | 2569 | void sock_prot_inuse_add(struct net *net, struct proto *prot, int val) |
1338d466 | 2570 | { |
d6d9ca0f | 2571 | __this_cpu_add(prot_inuse.val[prot->inuse_idx], val); |
1338d466 PE |
2572 | } |
2573 | EXPORT_SYMBOL_GPL(sock_prot_inuse_add); | |
2574 | ||
c29a0bc4 | 2575 | int sock_prot_inuse_get(struct net *net, struct proto *prot) |
1338d466 PE |
2576 | { |
2577 | int cpu, idx = prot->inuse_idx; | |
2578 | int res = 0; | |
2579 | ||
2580 | for_each_possible_cpu(cpu) | |
2581 | res += per_cpu(prot_inuse, cpu).val[idx]; | |
2582 | ||
2583 | return res >= 0 ? res : 0; | |
2584 | } | |
2585 | EXPORT_SYMBOL_GPL(sock_prot_inuse_get); | |
70ee1159 | 2586 | #endif |
13ff3d6f PE |
2587 | |
2588 | static void assign_proto_idx(struct proto *prot) | |
2589 | { | |
2590 | prot->inuse_idx = find_first_zero_bit(proto_inuse_idx, PROTO_INUSE_NR); | |
2591 | ||
2592 | if (unlikely(prot->inuse_idx == PROTO_INUSE_NR - 1)) { | |
e005d193 | 2593 | pr_err("PROTO_INUSE_NR exhausted\n"); |
13ff3d6f PE |
2594 | return; |
2595 | } | |
2596 | ||
2597 | set_bit(prot->inuse_idx, proto_inuse_idx); | |
2598 | } | |
2599 | ||
2600 | static void release_proto_idx(struct proto *prot) | |
2601 | { | |
2602 | if (prot->inuse_idx != PROTO_INUSE_NR - 1) | |
2603 | clear_bit(prot->inuse_idx, proto_inuse_idx); | |
2604 | } | |
2605 | #else | |
2606 | static inline void assign_proto_idx(struct proto *prot) | |
2607 | { | |
2608 | } | |
2609 | ||
2610 | static inline void release_proto_idx(struct proto *prot) | |
2611 | { | |
2612 | } | |
2613 | #endif | |
2614 | ||
b733c007 PE |
2615 | int proto_register(struct proto *prot, int alloc_slab) |
2616 | { | |
1da177e4 LT |
2617 | if (alloc_slab) { |
2618 | prot->slab = kmem_cache_create(prot->name, prot->obj_size, 0, | |
271b72c7 ED |
2619 | SLAB_HWCACHE_ALIGN | prot->slab_flags, |
2620 | NULL); | |
1da177e4 LT |
2621 | |
2622 | if (prot->slab == NULL) { | |
e005d193 JP |
2623 | pr_crit("%s: Can't create sock SLAB cache!\n", |
2624 | prot->name); | |
60e7663d | 2625 | goto out; |
1da177e4 | 2626 | } |
2e6599cb ACM |
2627 | |
2628 | if (prot->rsk_prot != NULL) { | |
faf23422 | 2629 | prot->rsk_prot->slab_name = kasprintf(GFP_KERNEL, "request_sock_%s", prot->name); |
7e56b5d6 | 2630 | if (prot->rsk_prot->slab_name == NULL) |
2e6599cb ACM |
2631 | goto out_free_sock_slab; |
2632 | ||
7e56b5d6 | 2633 | prot->rsk_prot->slab = kmem_cache_create(prot->rsk_prot->slab_name, |
2e6599cb | 2634 | prot->rsk_prot->obj_size, 0, |
20c2df83 | 2635 | SLAB_HWCACHE_ALIGN, NULL); |
2e6599cb ACM |
2636 | |
2637 | if (prot->rsk_prot->slab == NULL) { | |
e005d193 JP |
2638 | pr_crit("%s: Can't create request sock SLAB cache!\n", |
2639 | prot->name); | |
2e6599cb ACM |
2640 | goto out_free_request_sock_slab_name; |
2641 | } | |
2642 | } | |
8feaf0c0 | 2643 | |
6d6ee43e | 2644 | if (prot->twsk_prot != NULL) { |
faf23422 | 2645 | prot->twsk_prot->twsk_slab_name = kasprintf(GFP_KERNEL, "tw_sock_%s", prot->name); |
8feaf0c0 | 2646 | |
7e56b5d6 | 2647 | if (prot->twsk_prot->twsk_slab_name == NULL) |
8feaf0c0 ACM |
2648 | goto out_free_request_sock_slab; |
2649 | ||
6d6ee43e | 2650 | prot->twsk_prot->twsk_slab = |
7e56b5d6 | 2651 | kmem_cache_create(prot->twsk_prot->twsk_slab_name, |
6d6ee43e | 2652 | prot->twsk_prot->twsk_obj_size, |
3ab5aee7 ED |
2653 | 0, |
2654 | SLAB_HWCACHE_ALIGN | | |
2655 | prot->slab_flags, | |
20c2df83 | 2656 | NULL); |
6d6ee43e | 2657 | if (prot->twsk_prot->twsk_slab == NULL) |
8feaf0c0 ACM |
2658 | goto out_free_timewait_sock_slab_name; |
2659 | } | |
1da177e4 LT |
2660 | } |
2661 | ||
36b77a52 | 2662 | mutex_lock(&proto_list_mutex); |
1da177e4 | 2663 | list_add(&prot->node, &proto_list); |
13ff3d6f | 2664 | assign_proto_idx(prot); |
36b77a52 | 2665 | mutex_unlock(&proto_list_mutex); |
b733c007 PE |
2666 | return 0; |
2667 | ||
8feaf0c0 | 2668 | out_free_timewait_sock_slab_name: |
7e56b5d6 | 2669 | kfree(prot->twsk_prot->twsk_slab_name); |
8feaf0c0 ACM |
2670 | out_free_request_sock_slab: |
2671 | if (prot->rsk_prot && prot->rsk_prot->slab) { | |
2672 | kmem_cache_destroy(prot->rsk_prot->slab); | |
2673 | prot->rsk_prot->slab = NULL; | |
2674 | } | |
2e6599cb | 2675 | out_free_request_sock_slab_name: |
72150e9b DC |
2676 | if (prot->rsk_prot) |
2677 | kfree(prot->rsk_prot->slab_name); | |
2e6599cb ACM |
2678 | out_free_sock_slab: |
2679 | kmem_cache_destroy(prot->slab); | |
2680 | prot->slab = NULL; | |
b733c007 PE |
2681 | out: |
2682 | return -ENOBUFS; | |
1da177e4 | 2683 | } |
1da177e4 LT |
2684 | EXPORT_SYMBOL(proto_register); |
2685 | ||
2686 | void proto_unregister(struct proto *prot) | |
2687 | { | |
36b77a52 | 2688 | mutex_lock(&proto_list_mutex); |
13ff3d6f | 2689 | release_proto_idx(prot); |
0a3f4358 | 2690 | list_del(&prot->node); |
36b77a52 | 2691 | mutex_unlock(&proto_list_mutex); |
1da177e4 LT |
2692 | |
2693 | if (prot->slab != NULL) { | |
2694 | kmem_cache_destroy(prot->slab); | |
2695 | prot->slab = NULL; | |
2696 | } | |
2697 | ||
2e6599cb | 2698 | if (prot->rsk_prot != NULL && prot->rsk_prot->slab != NULL) { |
2e6599cb | 2699 | kmem_cache_destroy(prot->rsk_prot->slab); |
7e56b5d6 | 2700 | kfree(prot->rsk_prot->slab_name); |
2e6599cb ACM |
2701 | prot->rsk_prot->slab = NULL; |
2702 | } | |
2703 | ||
6d6ee43e | 2704 | if (prot->twsk_prot != NULL && prot->twsk_prot->twsk_slab != NULL) { |
6d6ee43e | 2705 | kmem_cache_destroy(prot->twsk_prot->twsk_slab); |
7e56b5d6 | 2706 | kfree(prot->twsk_prot->twsk_slab_name); |
6d6ee43e | 2707 | prot->twsk_prot->twsk_slab = NULL; |
8feaf0c0 | 2708 | } |
1da177e4 | 2709 | } |
1da177e4 LT |
2710 | EXPORT_SYMBOL(proto_unregister); |
2711 | ||
2712 | #ifdef CONFIG_PROC_FS | |
1da177e4 | 2713 | static void *proto_seq_start(struct seq_file *seq, loff_t *pos) |
36b77a52 | 2714 | __acquires(proto_list_mutex) |
1da177e4 | 2715 | { |
36b77a52 | 2716 | mutex_lock(&proto_list_mutex); |
60f0438a | 2717 | return seq_list_start_head(&proto_list, *pos); |
1da177e4 LT |
2718 | } |
2719 | ||
2720 | static void *proto_seq_next(struct seq_file *seq, void *v, loff_t *pos) | |
2721 | { | |
60f0438a | 2722 | return seq_list_next(v, &proto_list, pos); |
1da177e4 LT |
2723 | } |
2724 | ||
2725 | static void proto_seq_stop(struct seq_file *seq, void *v) | |
36b77a52 | 2726 | __releases(proto_list_mutex) |
1da177e4 | 2727 | { |
36b77a52 | 2728 | mutex_unlock(&proto_list_mutex); |
1da177e4 LT |
2729 | } |
2730 | ||
2731 | static char proto_method_implemented(const void *method) | |
2732 | { | |
2733 | return method == NULL ? 'n' : 'y'; | |
2734 | } | |
180d8cd9 GC |
2735 | static long sock_prot_memory_allocated(struct proto *proto) |
2736 | { | |
cb75a36c | 2737 | return proto->memory_allocated != NULL ? proto_memory_allocated(proto) : -1L; |
180d8cd9 GC |
2738 | } |
2739 | ||
2740 | static char *sock_prot_memory_pressure(struct proto *proto) | |
2741 | { | |
2742 | return proto->memory_pressure != NULL ? | |
2743 | proto_memory_pressure(proto) ? "yes" : "no" : "NI"; | |
2744 | } | |
1da177e4 LT |
2745 | |
2746 | static void proto_seq_printf(struct seq_file *seq, struct proto *proto) | |
2747 | { | |
180d8cd9 | 2748 | |
8d987e5c | 2749 | seq_printf(seq, "%-9s %4u %6d %6ld %-3s %6u %-3s %-10s " |
1da177e4 LT |
2750 | "%2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c\n", |
2751 | proto->name, | |
2752 | proto->obj_size, | |
14e943db | 2753 | sock_prot_inuse_get(seq_file_net(seq), proto), |
180d8cd9 GC |
2754 | sock_prot_memory_allocated(proto), |
2755 | sock_prot_memory_pressure(proto), | |
1da177e4 LT |
2756 | proto->max_header, |
2757 | proto->slab == NULL ? "no" : "yes", | |
2758 | module_name(proto->owner), | |
2759 | proto_method_implemented(proto->close), | |
2760 | proto_method_implemented(proto->connect), | |
2761 | proto_method_implemented(proto->disconnect), | |
2762 | proto_method_implemented(proto->accept), | |
2763 | proto_method_implemented(proto->ioctl), | |
2764 | proto_method_implemented(proto->init), | |
2765 | proto_method_implemented(proto->destroy), | |
2766 | proto_method_implemented(proto->shutdown), | |
2767 | proto_method_implemented(proto->setsockopt), | |
2768 | proto_method_implemented(proto->getsockopt), | |
2769 | proto_method_implemented(proto->sendmsg), | |
2770 | proto_method_implemented(proto->recvmsg), | |
2771 | proto_method_implemented(proto->sendpage), | |
2772 | proto_method_implemented(proto->bind), | |
2773 | proto_method_implemented(proto->backlog_rcv), | |
2774 | proto_method_implemented(proto->hash), | |
2775 | proto_method_implemented(proto->unhash), | |
2776 | proto_method_implemented(proto->get_port), | |
2777 | proto_method_implemented(proto->enter_memory_pressure)); | |
2778 | } | |
2779 | ||
2780 | static int proto_seq_show(struct seq_file *seq, void *v) | |
2781 | { | |
60f0438a | 2782 | if (v == &proto_list) |
1da177e4 LT |
2783 | seq_printf(seq, "%-9s %-4s %-8s %-6s %-5s %-7s %-4s %-10s %s", |
2784 | "protocol", | |
2785 | "size", | |
2786 | "sockets", | |
2787 | "memory", | |
2788 | "press", | |
2789 | "maxhdr", | |
2790 | "slab", | |
2791 | "module", | |
2792 | "cl co di ac io in de sh ss gs se re sp bi br ha uh gp em\n"); | |
2793 | else | |
60f0438a | 2794 | proto_seq_printf(seq, list_entry(v, struct proto, node)); |
1da177e4 LT |
2795 | return 0; |
2796 | } | |
2797 | ||
f690808e | 2798 | static const struct seq_operations proto_seq_ops = { |
1da177e4 LT |
2799 | .start = proto_seq_start, |
2800 | .next = proto_seq_next, | |
2801 | .stop = proto_seq_stop, | |
2802 | .show = proto_seq_show, | |
2803 | }; | |
2804 | ||
2805 | static int proto_seq_open(struct inode *inode, struct file *file) | |
2806 | { | |
14e943db ED |
2807 | return seq_open_net(inode, file, &proto_seq_ops, |
2808 | sizeof(struct seq_net_private)); | |
1da177e4 LT |
2809 | } |
2810 | ||
9a32144e | 2811 | static const struct file_operations proto_seq_fops = { |
1da177e4 LT |
2812 | .owner = THIS_MODULE, |
2813 | .open = proto_seq_open, | |
2814 | .read = seq_read, | |
2815 | .llseek = seq_lseek, | |
14e943db ED |
2816 | .release = seq_release_net, |
2817 | }; | |
2818 | ||
2819 | static __net_init int proto_init_net(struct net *net) | |
2820 | { | |
2821 | if (!proc_net_fops_create(net, "protocols", S_IRUGO, &proto_seq_fops)) | |
2822 | return -ENOMEM; | |
2823 | ||
2824 | return 0; | |
2825 | } | |
2826 | ||
2827 | static __net_exit void proto_exit_net(struct net *net) | |
2828 | { | |
2829 | proc_net_remove(net, "protocols"); | |
2830 | } | |
2831 | ||
2832 | ||
2833 | static __net_initdata struct pernet_operations proto_net_ops = { | |
2834 | .init = proto_init_net, | |
2835 | .exit = proto_exit_net, | |
1da177e4 LT |
2836 | }; |
2837 | ||
2838 | static int __init proto_init(void) | |
2839 | { | |
14e943db | 2840 | return register_pernet_subsys(&proto_net_ops); |
1da177e4 LT |
2841 | } |
2842 | ||
2843 | subsys_initcall(proto_init); | |
2844 | ||
2845 | #endif /* PROC_FS */ |