Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * INET An implementation of the TCP/IP protocol suite for the LINUX | |
3 | * operating system. INET is implemented using the BSD Socket | |
4 | * interface as the means of communication with the user level. | |
5 | * | |
6 | * Generic socket support routines. Memory allocators, socket lock/release | |
7 | * handler for protocols to use and generic option handler. | |
8 | * | |
9 | * | |
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 | 95 | #include <linux/errno.h> |
cb820f8e | 96 | #include <linux/errqueue.h> |
1da177e4 LT |
97 | #include <linux/types.h> |
98 | #include <linux/socket.h> | |
99 | #include <linux/in.h> | |
100 | #include <linux/kernel.h> | |
1da177e4 LT |
101 | #include <linux/module.h> |
102 | #include <linux/proc_fs.h> | |
103 | #include <linux/seq_file.h> | |
104 | #include <linux/sched.h> | |
105 | #include <linux/timer.h> | |
106 | #include <linux/string.h> | |
107 | #include <linux/sockios.h> | |
108 | #include <linux/net.h> | |
109 | #include <linux/mm.h> | |
110 | #include <linux/slab.h> | |
111 | #include <linux/interrupt.h> | |
112 | #include <linux/poll.h> | |
113 | #include <linux/tcp.h> | |
114 | #include <linux/init.h> | |
a1f8e7f7 | 115 | #include <linux/highmem.h> |
3f551f94 | 116 | #include <linux/user_namespace.h> |
c5905afb | 117 | #include <linux/static_key.h> |
3969eb38 | 118 | #include <linux/memcontrol.h> |
8c1ae10d | 119 | #include <linux/prefetch.h> |
1da177e4 LT |
120 | |
121 | #include <asm/uaccess.h> | |
1da177e4 LT |
122 | |
123 | #include <linux/netdevice.h> | |
124 | #include <net/protocol.h> | |
125 | #include <linux/skbuff.h> | |
457c4cbc | 126 | #include <net/net_namespace.h> |
2e6599cb | 127 | #include <net/request_sock.h> |
1da177e4 | 128 | #include <net/sock.h> |
20d49473 | 129 | #include <linux/net_tstamp.h> |
1da177e4 LT |
130 | #include <net/xfrm.h> |
131 | #include <linux/ipsec.h> | |
f8451725 | 132 | #include <net/cls_cgroup.h> |
5bc1421e | 133 | #include <net/netprio_cgroup.h> |
1da177e4 LT |
134 | |
135 | #include <linux/filter.h> | |
136 | ||
3847ce32 SM |
137 | #include <trace/events/sock.h> |
138 | ||
1da177e4 LT |
139 | #ifdef CONFIG_INET |
140 | #include <net/tcp.h> | |
141 | #endif | |
142 | ||
076bb0c8 | 143 | #include <net/busy_poll.h> |
06021292 | 144 | |
36b77a52 | 145 | static DEFINE_MUTEX(proto_list_mutex); |
d1a4c0b3 GC |
146 | static LIST_HEAD(proto_list); |
147 | ||
c255a458 | 148 | #ifdef CONFIG_MEMCG_KMEM |
1d62e436 | 149 | int mem_cgroup_sockets_init(struct mem_cgroup *memcg, struct cgroup_subsys *ss) |
d1a4c0b3 GC |
150 | { |
151 | struct proto *proto; | |
152 | int ret = 0; | |
153 | ||
36b77a52 | 154 | mutex_lock(&proto_list_mutex); |
d1a4c0b3 GC |
155 | list_for_each_entry(proto, &proto_list, node) { |
156 | if (proto->init_cgroup) { | |
1d62e436 | 157 | ret = proto->init_cgroup(memcg, ss); |
d1a4c0b3 GC |
158 | if (ret) |
159 | goto out; | |
160 | } | |
161 | } | |
162 | ||
36b77a52 | 163 | mutex_unlock(&proto_list_mutex); |
d1a4c0b3 GC |
164 | return ret; |
165 | out: | |
166 | list_for_each_entry_continue_reverse(proto, &proto_list, node) | |
167 | if (proto->destroy_cgroup) | |
1d62e436 | 168 | proto->destroy_cgroup(memcg); |
36b77a52 | 169 | mutex_unlock(&proto_list_mutex); |
d1a4c0b3 GC |
170 | return ret; |
171 | } | |
172 | ||
1d62e436 | 173 | void mem_cgroup_sockets_destroy(struct mem_cgroup *memcg) |
d1a4c0b3 GC |
174 | { |
175 | struct proto *proto; | |
176 | ||
36b77a52 | 177 | mutex_lock(&proto_list_mutex); |
d1a4c0b3 GC |
178 | list_for_each_entry_reverse(proto, &proto_list, node) |
179 | if (proto->destroy_cgroup) | |
1d62e436 | 180 | proto->destroy_cgroup(memcg); |
36b77a52 | 181 | mutex_unlock(&proto_list_mutex); |
d1a4c0b3 GC |
182 | } |
183 | #endif | |
184 | ||
da21f24d IM |
185 | /* |
186 | * Each address family might have different locking rules, so we have | |
187 | * one slock key per address family: | |
188 | */ | |
a5b5bb9a IM |
189 | static struct lock_class_key af_family_keys[AF_MAX]; |
190 | static struct lock_class_key af_family_slock_keys[AF_MAX]; | |
191 | ||
cbda4eaf | 192 | #if defined(CONFIG_MEMCG_KMEM) |
c5905afb | 193 | struct static_key memcg_socket_limit_enabled; |
e1aab161 | 194 | EXPORT_SYMBOL(memcg_socket_limit_enabled); |
cbda4eaf | 195 | #endif |
e1aab161 | 196 | |
a5b5bb9a IM |
197 | /* |
198 | * Make lock validator output more readable. (we pre-construct these | |
199 | * strings build-time, so that runtime initialization of socket | |
200 | * locks is fast): | |
201 | */ | |
36cbd3dc | 202 | static const char *const af_family_key_strings[AF_MAX+1] = { |
a5b5bb9a IM |
203 | "sk_lock-AF_UNSPEC", "sk_lock-AF_UNIX" , "sk_lock-AF_INET" , |
204 | "sk_lock-AF_AX25" , "sk_lock-AF_IPX" , "sk_lock-AF_APPLETALK", | |
205 | "sk_lock-AF_NETROM", "sk_lock-AF_BRIDGE" , "sk_lock-AF_ATMPVC" , | |
206 | "sk_lock-AF_X25" , "sk_lock-AF_INET6" , "sk_lock-AF_ROSE" , | |
207 | "sk_lock-AF_DECnet", "sk_lock-AF_NETBEUI" , "sk_lock-AF_SECURITY" , | |
208 | "sk_lock-AF_KEY" , "sk_lock-AF_NETLINK" , "sk_lock-AF_PACKET" , | |
209 | "sk_lock-AF_ASH" , "sk_lock-AF_ECONET" , "sk_lock-AF_ATMSVC" , | |
cbd151bf | 210 | "sk_lock-AF_RDS" , "sk_lock-AF_SNA" , "sk_lock-AF_IRDA" , |
a5b5bb9a | 211 | "sk_lock-AF_PPPOX" , "sk_lock-AF_WANPIPE" , "sk_lock-AF_LLC" , |
cd05acfe | 212 | "sk_lock-27" , "sk_lock-28" , "sk_lock-AF_CAN" , |
17926a79 | 213 | "sk_lock-AF_TIPC" , "sk_lock-AF_BLUETOOTH", "sk_lock-IUCV" , |
bce7b154 | 214 | "sk_lock-AF_RXRPC" , "sk_lock-AF_ISDN" , "sk_lock-AF_PHONET" , |
6f107b58 | 215 | "sk_lock-AF_IEEE802154", "sk_lock-AF_CAIF" , "sk_lock-AF_ALG" , |
456db6a4 | 216 | "sk_lock-AF_NFC" , "sk_lock-AF_VSOCK" , "sk_lock-AF_MAX" |
a5b5bb9a | 217 | }; |
36cbd3dc | 218 | static const char *const af_family_slock_key_strings[AF_MAX+1] = { |
a5b5bb9a IM |
219 | "slock-AF_UNSPEC", "slock-AF_UNIX" , "slock-AF_INET" , |
220 | "slock-AF_AX25" , "slock-AF_IPX" , "slock-AF_APPLETALK", | |
221 | "slock-AF_NETROM", "slock-AF_BRIDGE" , "slock-AF_ATMPVC" , | |
222 | "slock-AF_X25" , "slock-AF_INET6" , "slock-AF_ROSE" , | |
223 | "slock-AF_DECnet", "slock-AF_NETBEUI" , "slock-AF_SECURITY" , | |
224 | "slock-AF_KEY" , "slock-AF_NETLINK" , "slock-AF_PACKET" , | |
225 | "slock-AF_ASH" , "slock-AF_ECONET" , "slock-AF_ATMSVC" , | |
cbd151bf | 226 | "slock-AF_RDS" , "slock-AF_SNA" , "slock-AF_IRDA" , |
a5b5bb9a | 227 | "slock-AF_PPPOX" , "slock-AF_WANPIPE" , "slock-AF_LLC" , |
cd05acfe | 228 | "slock-27" , "slock-28" , "slock-AF_CAN" , |
17926a79 | 229 | "slock-AF_TIPC" , "slock-AF_BLUETOOTH", "slock-AF_IUCV" , |
bce7b154 | 230 | "slock-AF_RXRPC" , "slock-AF_ISDN" , "slock-AF_PHONET" , |
6f107b58 | 231 | "slock-AF_IEEE802154", "slock-AF_CAIF" , "slock-AF_ALG" , |
456db6a4 | 232 | "slock-AF_NFC" , "slock-AF_VSOCK" ,"slock-AF_MAX" |
a5b5bb9a | 233 | }; |
36cbd3dc | 234 | static const char *const af_family_clock_key_strings[AF_MAX+1] = { |
443aef0e PZ |
235 | "clock-AF_UNSPEC", "clock-AF_UNIX" , "clock-AF_INET" , |
236 | "clock-AF_AX25" , "clock-AF_IPX" , "clock-AF_APPLETALK", | |
237 | "clock-AF_NETROM", "clock-AF_BRIDGE" , "clock-AF_ATMPVC" , | |
238 | "clock-AF_X25" , "clock-AF_INET6" , "clock-AF_ROSE" , | |
239 | "clock-AF_DECnet", "clock-AF_NETBEUI" , "clock-AF_SECURITY" , | |
240 | "clock-AF_KEY" , "clock-AF_NETLINK" , "clock-AF_PACKET" , | |
241 | "clock-AF_ASH" , "clock-AF_ECONET" , "clock-AF_ATMSVC" , | |
cbd151bf | 242 | "clock-AF_RDS" , "clock-AF_SNA" , "clock-AF_IRDA" , |
443aef0e | 243 | "clock-AF_PPPOX" , "clock-AF_WANPIPE" , "clock-AF_LLC" , |
b4942af6 | 244 | "clock-27" , "clock-28" , "clock-AF_CAN" , |
e51f802b | 245 | "clock-AF_TIPC" , "clock-AF_BLUETOOTH", "clock-AF_IUCV" , |
bce7b154 | 246 | "clock-AF_RXRPC" , "clock-AF_ISDN" , "clock-AF_PHONET" , |
6f107b58 | 247 | "clock-AF_IEEE802154", "clock-AF_CAIF" , "clock-AF_ALG" , |
456db6a4 | 248 | "clock-AF_NFC" , "clock-AF_VSOCK" , "clock-AF_MAX" |
443aef0e | 249 | }; |
da21f24d IM |
250 | |
251 | /* | |
252 | * sk_callback_lock locking rules are per-address-family, | |
253 | * so split the lock classes by using a per-AF key: | |
254 | */ | |
255 | static struct lock_class_key af_callback_keys[AF_MAX]; | |
256 | ||
1da177e4 LT |
257 | /* Take into consideration the size of the struct sk_buff overhead in the |
258 | * determination of these values, since that is non-constant across | |
259 | * platforms. This makes socket queueing behavior and performance | |
260 | * not depend upon such differences. | |
261 | */ | |
262 | #define _SK_MEM_PACKETS 256 | |
87fb4b7b | 263 | #define _SK_MEM_OVERHEAD SKB_TRUESIZE(256) |
1da177e4 LT |
264 | #define SK_WMEM_MAX (_SK_MEM_OVERHEAD * _SK_MEM_PACKETS) |
265 | #define SK_RMEM_MAX (_SK_MEM_OVERHEAD * _SK_MEM_PACKETS) | |
266 | ||
267 | /* Run time adjustable parameters. */ | |
ab32ea5d | 268 | __u32 sysctl_wmem_max __read_mostly = SK_WMEM_MAX; |
6d8ebc8a | 269 | EXPORT_SYMBOL(sysctl_wmem_max); |
ab32ea5d | 270 | __u32 sysctl_rmem_max __read_mostly = SK_RMEM_MAX; |
6d8ebc8a | 271 | EXPORT_SYMBOL(sysctl_rmem_max); |
ab32ea5d BH |
272 | __u32 sysctl_wmem_default __read_mostly = SK_WMEM_MAX; |
273 | __u32 sysctl_rmem_default __read_mostly = SK_RMEM_MAX; | |
1da177e4 | 274 | |
25985edc | 275 | /* Maximal space eaten by iovec or ancillary data plus some space */ |
ab32ea5d | 276 | int sysctl_optmem_max __read_mostly = sizeof(unsigned long)*(2*UIO_MAXIOV+512); |
2a91525c | 277 | EXPORT_SYMBOL(sysctl_optmem_max); |
1da177e4 | 278 | |
c93bdd0e MG |
279 | struct static_key memalloc_socks = STATIC_KEY_INIT_FALSE; |
280 | EXPORT_SYMBOL_GPL(memalloc_socks); | |
281 | ||
7cb02404 MG |
282 | /** |
283 | * sk_set_memalloc - sets %SOCK_MEMALLOC | |
284 | * @sk: socket to set it on | |
285 | * | |
286 | * Set %SOCK_MEMALLOC on a socket for access to emergency reserves. | |
287 | * It's the responsibility of the admin to adjust min_free_kbytes | |
288 | * to meet the requirements | |
289 | */ | |
290 | void sk_set_memalloc(struct sock *sk) | |
291 | { | |
292 | sock_set_flag(sk, SOCK_MEMALLOC); | |
293 | sk->sk_allocation |= __GFP_MEMALLOC; | |
c93bdd0e | 294 | static_key_slow_inc(&memalloc_socks); |
7cb02404 MG |
295 | } |
296 | EXPORT_SYMBOL_GPL(sk_set_memalloc); | |
297 | ||
298 | void sk_clear_memalloc(struct sock *sk) | |
299 | { | |
300 | sock_reset_flag(sk, SOCK_MEMALLOC); | |
301 | sk->sk_allocation &= ~__GFP_MEMALLOC; | |
c93bdd0e | 302 | static_key_slow_dec(&memalloc_socks); |
c76562b6 MG |
303 | |
304 | /* | |
305 | * SOCK_MEMALLOC is allowed to ignore rmem limits to ensure forward | |
306 | * progress of swapping. However, if SOCK_MEMALLOC is cleared while | |
307 | * it has rmem allocations there is a risk that the user of the | |
308 | * socket cannot make forward progress due to exceeding the rmem | |
309 | * limits. By rights, sk_clear_memalloc() should only be called | |
310 | * on sockets being torn down but warn and reset the accounting if | |
311 | * that assumption breaks. | |
312 | */ | |
313 | if (WARN_ON(sk->sk_forward_alloc)) | |
314 | sk_mem_reclaim(sk); | |
7cb02404 MG |
315 | } |
316 | EXPORT_SYMBOL_GPL(sk_clear_memalloc); | |
317 | ||
b4b9e355 MG |
318 | int __sk_backlog_rcv(struct sock *sk, struct sk_buff *skb) |
319 | { | |
320 | int ret; | |
321 | unsigned long pflags = current->flags; | |
322 | ||
323 | /* these should have been dropped before queueing */ | |
324 | BUG_ON(!sock_flag(sk, SOCK_MEMALLOC)); | |
325 | ||
326 | current->flags |= PF_MEMALLOC; | |
327 | ret = sk->sk_backlog_rcv(sk, skb); | |
328 | tsk_restore_flags(current, pflags, PF_MEMALLOC); | |
329 | ||
330 | return ret; | |
331 | } | |
332 | EXPORT_SYMBOL(__sk_backlog_rcv); | |
333 | ||
1da177e4 LT |
334 | static int sock_set_timeout(long *timeo_p, char __user *optval, int optlen) |
335 | { | |
336 | struct timeval tv; | |
337 | ||
338 | if (optlen < sizeof(tv)) | |
339 | return -EINVAL; | |
340 | if (copy_from_user(&tv, optval, sizeof(tv))) | |
341 | return -EFAULT; | |
ba78073e VA |
342 | if (tv.tv_usec < 0 || tv.tv_usec >= USEC_PER_SEC) |
343 | return -EDOM; | |
1da177e4 | 344 | |
ba78073e | 345 | if (tv.tv_sec < 0) { |
6f11df83 AM |
346 | static int warned __read_mostly; |
347 | ||
ba78073e | 348 | *timeo_p = 0; |
50aab54f | 349 | if (warned < 10 && net_ratelimit()) { |
ba78073e | 350 | warned++; |
e005d193 JP |
351 | pr_info("%s: `%s' (pid %d) tries to set negative timeout\n", |
352 | __func__, current->comm, task_pid_nr(current)); | |
50aab54f | 353 | } |
ba78073e VA |
354 | return 0; |
355 | } | |
1da177e4 LT |
356 | *timeo_p = MAX_SCHEDULE_TIMEOUT; |
357 | if (tv.tv_sec == 0 && tv.tv_usec == 0) | |
358 | return 0; | |
359 | if (tv.tv_sec < (MAX_SCHEDULE_TIMEOUT/HZ - 1)) | |
360 | *timeo_p = tv.tv_sec*HZ + (tv.tv_usec+(1000000/HZ-1))/(1000000/HZ); | |
361 | return 0; | |
362 | } | |
363 | ||
364 | static void sock_warn_obsolete_bsdism(const char *name) | |
365 | { | |
366 | static int warned; | |
367 | static char warncomm[TASK_COMM_LEN]; | |
4ec93edb YH |
368 | if (strcmp(warncomm, current->comm) && warned < 5) { |
369 | strcpy(warncomm, current->comm); | |
e005d193 JP |
370 | pr_warn("process `%s' is using obsolete %s SO_BSDCOMPAT\n", |
371 | warncomm, name); | |
1da177e4 LT |
372 | warned++; |
373 | } | |
374 | } | |
375 | ||
08e29af3 ED |
376 | #define SK_FLAGS_TIMESTAMP ((1UL << SOCK_TIMESTAMP) | (1UL << SOCK_TIMESTAMPING_RX_SOFTWARE)) |
377 | ||
378 | static void sock_disable_timestamp(struct sock *sk, unsigned long flags) | |
4ec93edb | 379 | { |
08e29af3 ED |
380 | if (sk->sk_flags & flags) { |
381 | sk->sk_flags &= ~flags; | |
382 | if (!(sk->sk_flags & SK_FLAGS_TIMESTAMP)) | |
20d49473 | 383 | net_disable_timestamp(); |
1da177e4 LT |
384 | } |
385 | } | |
386 | ||
387 | ||
f0088a50 DV |
388 | int sock_queue_rcv_skb(struct sock *sk, struct sk_buff *skb) |
389 | { | |
766e9037 | 390 | int err; |
f0088a50 | 391 | int skb_len; |
3b885787 NH |
392 | unsigned long flags; |
393 | struct sk_buff_head *list = &sk->sk_receive_queue; | |
f0088a50 | 394 | |
0fd7bac6 | 395 | if (atomic_read(&sk->sk_rmem_alloc) >= sk->sk_rcvbuf) { |
766e9037 | 396 | atomic_inc(&sk->sk_drops); |
3847ce32 | 397 | trace_sock_rcvqueue_full(sk, skb); |
766e9037 | 398 | return -ENOMEM; |
f0088a50 DV |
399 | } |
400 | ||
fda9ef5d | 401 | err = sk_filter(sk, skb); |
f0088a50 | 402 | if (err) |
766e9037 | 403 | return err; |
f0088a50 | 404 | |
c76562b6 | 405 | if (!sk_rmem_schedule(sk, skb, skb->truesize)) { |
766e9037 ED |
406 | atomic_inc(&sk->sk_drops); |
407 | return -ENOBUFS; | |
3ab224be HA |
408 | } |
409 | ||
f0088a50 DV |
410 | skb->dev = NULL; |
411 | skb_set_owner_r(skb, sk); | |
49ad9599 | 412 | |
f0088a50 DV |
413 | /* Cache the SKB length before we tack it onto the receive |
414 | * queue. Once it is added it no longer belongs to us and | |
415 | * may be freed by other threads of control pulling packets | |
416 | * from the queue. | |
417 | */ | |
418 | skb_len = skb->len; | |
419 | ||
7fee226a ED |
420 | /* we escape from rcu protected region, make sure we dont leak |
421 | * a norefcounted dst | |
422 | */ | |
423 | skb_dst_force(skb); | |
424 | ||
3b885787 NH |
425 | spin_lock_irqsave(&list->lock, flags); |
426 | skb->dropcount = atomic_read(&sk->sk_drops); | |
427 | __skb_queue_tail(list, skb); | |
428 | spin_unlock_irqrestore(&list->lock, flags); | |
f0088a50 DV |
429 | |
430 | if (!sock_flag(sk, SOCK_DEAD)) | |
431 | sk->sk_data_ready(sk, skb_len); | |
766e9037 | 432 | return 0; |
f0088a50 DV |
433 | } |
434 | EXPORT_SYMBOL(sock_queue_rcv_skb); | |
435 | ||
58a5a7b9 | 436 | int sk_receive_skb(struct sock *sk, struct sk_buff *skb, const int nested) |
f0088a50 DV |
437 | { |
438 | int rc = NET_RX_SUCCESS; | |
439 | ||
fda9ef5d | 440 | if (sk_filter(sk, skb)) |
f0088a50 DV |
441 | goto discard_and_relse; |
442 | ||
443 | skb->dev = NULL; | |
444 | ||
f545a38f | 445 | if (sk_rcvqueues_full(sk, skb, sk->sk_rcvbuf)) { |
c377411f ED |
446 | atomic_inc(&sk->sk_drops); |
447 | goto discard_and_relse; | |
448 | } | |
58a5a7b9 ACM |
449 | if (nested) |
450 | bh_lock_sock_nested(sk); | |
451 | else | |
452 | bh_lock_sock(sk); | |
a5b5bb9a IM |
453 | if (!sock_owned_by_user(sk)) { |
454 | /* | |
455 | * trylock + unlock semantics: | |
456 | */ | |
457 | mutex_acquire(&sk->sk_lock.dep_map, 0, 1, _RET_IP_); | |
458 | ||
c57943a1 | 459 | rc = sk_backlog_rcv(sk, skb); |
a5b5bb9a IM |
460 | |
461 | mutex_release(&sk->sk_lock.dep_map, 1, _RET_IP_); | |
f545a38f | 462 | } else if (sk_add_backlog(sk, skb, sk->sk_rcvbuf)) { |
8eae939f ZY |
463 | bh_unlock_sock(sk); |
464 | atomic_inc(&sk->sk_drops); | |
465 | goto discard_and_relse; | |
466 | } | |
467 | ||
f0088a50 DV |
468 | bh_unlock_sock(sk); |
469 | out: | |
470 | sock_put(sk); | |
471 | return rc; | |
472 | discard_and_relse: | |
473 | kfree_skb(skb); | |
474 | goto out; | |
475 | } | |
476 | EXPORT_SYMBOL(sk_receive_skb); | |
477 | ||
ea94ff3b KK |
478 | void sk_reset_txq(struct sock *sk) |
479 | { | |
480 | sk_tx_queue_clear(sk); | |
481 | } | |
482 | EXPORT_SYMBOL(sk_reset_txq); | |
483 | ||
f0088a50 DV |
484 | struct dst_entry *__sk_dst_check(struct sock *sk, u32 cookie) |
485 | { | |
b6c6712a | 486 | struct dst_entry *dst = __sk_dst_get(sk); |
f0088a50 DV |
487 | |
488 | if (dst && dst->obsolete && dst->ops->check(dst, cookie) == NULL) { | |
e022f0b4 | 489 | sk_tx_queue_clear(sk); |
a9b3cd7f | 490 | RCU_INIT_POINTER(sk->sk_dst_cache, NULL); |
f0088a50 DV |
491 | dst_release(dst); |
492 | return NULL; | |
493 | } | |
494 | ||
495 | return dst; | |
496 | } | |
497 | EXPORT_SYMBOL(__sk_dst_check); | |
498 | ||
499 | struct dst_entry *sk_dst_check(struct sock *sk, u32 cookie) | |
500 | { | |
501 | struct dst_entry *dst = sk_dst_get(sk); | |
502 | ||
503 | if (dst && dst->obsolete && dst->ops->check(dst, cookie) == NULL) { | |
504 | sk_dst_reset(sk); | |
505 | dst_release(dst); | |
506 | return NULL; | |
507 | } | |
508 | ||
509 | return dst; | |
510 | } | |
511 | EXPORT_SYMBOL(sk_dst_check); | |
512 | ||
c91f6df2 BH |
513 | static int sock_setbindtodevice(struct sock *sk, char __user *optval, |
514 | int optlen) | |
4878809f DM |
515 | { |
516 | int ret = -ENOPROTOOPT; | |
517 | #ifdef CONFIG_NETDEVICES | |
3b1e0a65 | 518 | struct net *net = sock_net(sk); |
4878809f DM |
519 | char devname[IFNAMSIZ]; |
520 | int index; | |
521 | ||
522 | /* Sorry... */ | |
523 | ret = -EPERM; | |
5e1fccc0 | 524 | if (!ns_capable(net->user_ns, CAP_NET_RAW)) |
4878809f DM |
525 | goto out; |
526 | ||
527 | ret = -EINVAL; | |
528 | if (optlen < 0) | |
529 | goto out; | |
530 | ||
531 | /* Bind this socket to a particular device like "eth0", | |
532 | * as specified in the passed interface name. If the | |
533 | * name is "" or the option length is zero the socket | |
534 | * is not bound. | |
535 | */ | |
536 | if (optlen > IFNAMSIZ - 1) | |
537 | optlen = IFNAMSIZ - 1; | |
538 | memset(devname, 0, sizeof(devname)); | |
539 | ||
540 | ret = -EFAULT; | |
541 | if (copy_from_user(devname, optval, optlen)) | |
542 | goto out; | |
543 | ||
000ba2e4 DM |
544 | index = 0; |
545 | if (devname[0] != '\0') { | |
bf8e56bf | 546 | struct net_device *dev; |
4878809f | 547 | |
bf8e56bf ED |
548 | rcu_read_lock(); |
549 | dev = dev_get_by_name_rcu(net, devname); | |
550 | if (dev) | |
551 | index = dev->ifindex; | |
552 | rcu_read_unlock(); | |
4878809f DM |
553 | ret = -ENODEV; |
554 | if (!dev) | |
555 | goto out; | |
4878809f DM |
556 | } |
557 | ||
558 | lock_sock(sk); | |
559 | sk->sk_bound_dev_if = index; | |
560 | sk_dst_reset(sk); | |
561 | release_sock(sk); | |
562 | ||
563 | ret = 0; | |
564 | ||
565 | out: | |
566 | #endif | |
567 | ||
568 | return ret; | |
569 | } | |
570 | ||
c91f6df2 BH |
571 | static int sock_getbindtodevice(struct sock *sk, char __user *optval, |
572 | int __user *optlen, int len) | |
573 | { | |
574 | int ret = -ENOPROTOOPT; | |
575 | #ifdef CONFIG_NETDEVICES | |
576 | struct net *net = sock_net(sk); | |
c91f6df2 | 577 | char devname[IFNAMSIZ]; |
c91f6df2 BH |
578 | |
579 | if (sk->sk_bound_dev_if == 0) { | |
580 | len = 0; | |
581 | goto zero; | |
582 | } | |
583 | ||
584 | ret = -EINVAL; | |
585 | if (len < IFNAMSIZ) | |
586 | goto out; | |
587 | ||
5dbe7c17 NS |
588 | ret = netdev_get_name(net, devname, sk->sk_bound_dev_if); |
589 | if (ret) | |
c91f6df2 | 590 | goto out; |
c91f6df2 BH |
591 | |
592 | len = strlen(devname) + 1; | |
593 | ||
594 | ret = -EFAULT; | |
595 | if (copy_to_user(optval, devname, len)) | |
596 | goto out; | |
597 | ||
598 | zero: | |
599 | ret = -EFAULT; | |
600 | if (put_user(len, optlen)) | |
601 | goto out; | |
602 | ||
603 | ret = 0; | |
604 | ||
605 | out: | |
606 | #endif | |
607 | ||
608 | return ret; | |
609 | } | |
610 | ||
c0ef877b PE |
611 | static inline void sock_valbool_flag(struct sock *sk, int bit, int valbool) |
612 | { | |
613 | if (valbool) | |
614 | sock_set_flag(sk, bit); | |
615 | else | |
616 | sock_reset_flag(sk, bit); | |
617 | } | |
618 | ||
1da177e4 LT |
619 | /* |
620 | * This is meant for all protocols to use and covers goings on | |
621 | * at the socket level. Everything here is generic. | |
622 | */ | |
623 | ||
624 | int sock_setsockopt(struct socket *sock, int level, int optname, | |
b7058842 | 625 | char __user *optval, unsigned int optlen) |
1da177e4 | 626 | { |
2a91525c | 627 | struct sock *sk = sock->sk; |
1da177e4 LT |
628 | int val; |
629 | int valbool; | |
630 | struct linger ling; | |
631 | int ret = 0; | |
4ec93edb | 632 | |
1da177e4 LT |
633 | /* |
634 | * Options without arguments | |
635 | */ | |
636 | ||
4878809f | 637 | if (optname == SO_BINDTODEVICE) |
c91f6df2 | 638 | return sock_setbindtodevice(sk, optval, optlen); |
4878809f | 639 | |
e71a4783 SH |
640 | if (optlen < sizeof(int)) |
641 | return -EINVAL; | |
4ec93edb | 642 | |
1da177e4 LT |
643 | if (get_user(val, (int __user *)optval)) |
644 | return -EFAULT; | |
4ec93edb | 645 | |
2a91525c | 646 | valbool = val ? 1 : 0; |
1da177e4 LT |
647 | |
648 | lock_sock(sk); | |
649 | ||
2a91525c | 650 | switch (optname) { |
e71a4783 | 651 | case SO_DEBUG: |
2a91525c | 652 | if (val && !capable(CAP_NET_ADMIN)) |
e71a4783 | 653 | ret = -EACCES; |
2a91525c | 654 | else |
c0ef877b | 655 | sock_valbool_flag(sk, SOCK_DBG, valbool); |
e71a4783 SH |
656 | break; |
657 | case SO_REUSEADDR: | |
4a17fd52 | 658 | sk->sk_reuse = (valbool ? SK_CAN_REUSE : SK_NO_REUSE); |
e71a4783 | 659 | break; |
055dc21a TH |
660 | case SO_REUSEPORT: |
661 | sk->sk_reuseport = valbool; | |
662 | break; | |
e71a4783 | 663 | case SO_TYPE: |
49c794e9 | 664 | case SO_PROTOCOL: |
0d6038ee | 665 | case SO_DOMAIN: |
e71a4783 SH |
666 | case SO_ERROR: |
667 | ret = -ENOPROTOOPT; | |
668 | break; | |
669 | case SO_DONTROUTE: | |
c0ef877b | 670 | sock_valbool_flag(sk, SOCK_LOCALROUTE, valbool); |
e71a4783 SH |
671 | break; |
672 | case SO_BROADCAST: | |
673 | sock_valbool_flag(sk, SOCK_BROADCAST, valbool); | |
674 | break; | |
675 | case SO_SNDBUF: | |
676 | /* Don't error on this BSD doesn't and if you think | |
82981930 ED |
677 | * about it this is right. Otherwise apps have to |
678 | * play 'guess the biggest size' games. RCVBUF/SNDBUF | |
679 | * are treated in BSD as hints | |
680 | */ | |
681 | val = min_t(u32, val, sysctl_wmem_max); | |
b0573dea | 682 | set_sndbuf: |
e71a4783 | 683 | sk->sk_userlocks |= SOCK_SNDBUF_LOCK; |
82981930 ED |
684 | sk->sk_sndbuf = max_t(u32, val * 2, SOCK_MIN_SNDBUF); |
685 | /* Wake up sending tasks if we upped the value. */ | |
e71a4783 SH |
686 | sk->sk_write_space(sk); |
687 | break; | |
1da177e4 | 688 | |
e71a4783 SH |
689 | case SO_SNDBUFFORCE: |
690 | if (!capable(CAP_NET_ADMIN)) { | |
691 | ret = -EPERM; | |
692 | break; | |
693 | } | |
694 | goto set_sndbuf; | |
b0573dea | 695 | |
e71a4783 SH |
696 | case SO_RCVBUF: |
697 | /* Don't error on this BSD doesn't and if you think | |
82981930 ED |
698 | * about it this is right. Otherwise apps have to |
699 | * play 'guess the biggest size' games. RCVBUF/SNDBUF | |
700 | * are treated in BSD as hints | |
701 | */ | |
702 | val = min_t(u32, val, sysctl_rmem_max); | |
b0573dea | 703 | set_rcvbuf: |
e71a4783 SH |
704 | sk->sk_userlocks |= SOCK_RCVBUF_LOCK; |
705 | /* | |
706 | * We double it on the way in to account for | |
707 | * "struct sk_buff" etc. overhead. Applications | |
708 | * assume that the SO_RCVBUF setting they make will | |
709 | * allow that much actual data to be received on that | |
710 | * socket. | |
711 | * | |
712 | * Applications are unaware that "struct sk_buff" and | |
713 | * other overheads allocate from the receive buffer | |
714 | * during socket buffer allocation. | |
715 | * | |
716 | * And after considering the possible alternatives, | |
717 | * returning the value we actually used in getsockopt | |
718 | * is the most desirable behavior. | |
719 | */ | |
82981930 | 720 | sk->sk_rcvbuf = max_t(u32, val * 2, SOCK_MIN_RCVBUF); |
e71a4783 SH |
721 | break; |
722 | ||
723 | case SO_RCVBUFFORCE: | |
724 | if (!capable(CAP_NET_ADMIN)) { | |
725 | ret = -EPERM; | |
1da177e4 | 726 | break; |
e71a4783 SH |
727 | } |
728 | goto set_rcvbuf; | |
1da177e4 | 729 | |
e71a4783 | 730 | case SO_KEEPALIVE: |
1da177e4 | 731 | #ifdef CONFIG_INET |
3e10986d ED |
732 | if (sk->sk_protocol == IPPROTO_TCP && |
733 | sk->sk_type == SOCK_STREAM) | |
e71a4783 | 734 | tcp_set_keepalive(sk, valbool); |
1da177e4 | 735 | #endif |
e71a4783 SH |
736 | sock_valbool_flag(sk, SOCK_KEEPOPEN, valbool); |
737 | break; | |
738 | ||
739 | case SO_OOBINLINE: | |
740 | sock_valbool_flag(sk, SOCK_URGINLINE, valbool); | |
741 | break; | |
742 | ||
743 | case SO_NO_CHECK: | |
744 | sk->sk_no_check = valbool; | |
745 | break; | |
746 | ||
747 | case SO_PRIORITY: | |
5e1fccc0 EB |
748 | if ((val >= 0 && val <= 6) || |
749 | ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN)) | |
e71a4783 SH |
750 | sk->sk_priority = val; |
751 | else | |
752 | ret = -EPERM; | |
753 | break; | |
754 | ||
755 | case SO_LINGER: | |
756 | if (optlen < sizeof(ling)) { | |
757 | ret = -EINVAL; /* 1003.1g */ | |
1da177e4 | 758 | break; |
e71a4783 | 759 | } |
2a91525c | 760 | if (copy_from_user(&ling, optval, sizeof(ling))) { |
e71a4783 | 761 | ret = -EFAULT; |
1da177e4 | 762 | break; |
e71a4783 SH |
763 | } |
764 | if (!ling.l_onoff) | |
765 | sock_reset_flag(sk, SOCK_LINGER); | |
766 | else { | |
1da177e4 | 767 | #if (BITS_PER_LONG == 32) |
e71a4783 SH |
768 | if ((unsigned int)ling.l_linger >= MAX_SCHEDULE_TIMEOUT/HZ) |
769 | sk->sk_lingertime = MAX_SCHEDULE_TIMEOUT; | |
1da177e4 | 770 | else |
e71a4783 SH |
771 | #endif |
772 | sk->sk_lingertime = (unsigned int)ling.l_linger * HZ; | |
773 | sock_set_flag(sk, SOCK_LINGER); | |
774 | } | |
775 | break; | |
776 | ||
777 | case SO_BSDCOMPAT: | |
778 | sock_warn_obsolete_bsdism("setsockopt"); | |
779 | break; | |
780 | ||
781 | case SO_PASSCRED: | |
782 | if (valbool) | |
783 | set_bit(SOCK_PASSCRED, &sock->flags); | |
784 | else | |
785 | clear_bit(SOCK_PASSCRED, &sock->flags); | |
786 | break; | |
787 | ||
788 | case SO_TIMESTAMP: | |
92f37fd2 | 789 | case SO_TIMESTAMPNS: |
e71a4783 | 790 | if (valbool) { |
92f37fd2 ED |
791 | if (optname == SO_TIMESTAMP) |
792 | sock_reset_flag(sk, SOCK_RCVTSTAMPNS); | |
793 | else | |
794 | sock_set_flag(sk, SOCK_RCVTSTAMPNS); | |
e71a4783 | 795 | sock_set_flag(sk, SOCK_RCVTSTAMP); |
20d49473 | 796 | sock_enable_timestamp(sk, SOCK_TIMESTAMP); |
92f37fd2 | 797 | } else { |
e71a4783 | 798 | sock_reset_flag(sk, SOCK_RCVTSTAMP); |
92f37fd2 ED |
799 | sock_reset_flag(sk, SOCK_RCVTSTAMPNS); |
800 | } | |
e71a4783 SH |
801 | break; |
802 | ||
20d49473 PO |
803 | case SO_TIMESTAMPING: |
804 | if (val & ~SOF_TIMESTAMPING_MASK) { | |
f249fb78 | 805 | ret = -EINVAL; |
20d49473 PO |
806 | break; |
807 | } | |
808 | sock_valbool_flag(sk, SOCK_TIMESTAMPING_TX_HARDWARE, | |
809 | val & SOF_TIMESTAMPING_TX_HARDWARE); | |
810 | sock_valbool_flag(sk, SOCK_TIMESTAMPING_TX_SOFTWARE, | |
811 | val & SOF_TIMESTAMPING_TX_SOFTWARE); | |
812 | sock_valbool_flag(sk, SOCK_TIMESTAMPING_RX_HARDWARE, | |
813 | val & SOF_TIMESTAMPING_RX_HARDWARE); | |
814 | if (val & SOF_TIMESTAMPING_RX_SOFTWARE) | |
815 | sock_enable_timestamp(sk, | |
816 | SOCK_TIMESTAMPING_RX_SOFTWARE); | |
817 | else | |
818 | sock_disable_timestamp(sk, | |
08e29af3 | 819 | (1UL << SOCK_TIMESTAMPING_RX_SOFTWARE)); |
20d49473 PO |
820 | sock_valbool_flag(sk, SOCK_TIMESTAMPING_SOFTWARE, |
821 | val & SOF_TIMESTAMPING_SOFTWARE); | |
822 | sock_valbool_flag(sk, SOCK_TIMESTAMPING_SYS_HARDWARE, | |
823 | val & SOF_TIMESTAMPING_SYS_HARDWARE); | |
824 | sock_valbool_flag(sk, SOCK_TIMESTAMPING_RAW_HARDWARE, | |
825 | val & SOF_TIMESTAMPING_RAW_HARDWARE); | |
826 | break; | |
827 | ||
e71a4783 SH |
828 | case SO_RCVLOWAT: |
829 | if (val < 0) | |
830 | val = INT_MAX; | |
831 | sk->sk_rcvlowat = val ? : 1; | |
832 | break; | |
833 | ||
834 | case SO_RCVTIMEO: | |
835 | ret = sock_set_timeout(&sk->sk_rcvtimeo, optval, optlen); | |
836 | break; | |
837 | ||
838 | case SO_SNDTIMEO: | |
839 | ret = sock_set_timeout(&sk->sk_sndtimeo, optval, optlen); | |
840 | break; | |
1da177e4 | 841 | |
e71a4783 SH |
842 | case SO_ATTACH_FILTER: |
843 | ret = -EINVAL; | |
844 | if (optlen == sizeof(struct sock_fprog)) { | |
845 | struct sock_fprog fprog; | |
1da177e4 | 846 | |
e71a4783 SH |
847 | ret = -EFAULT; |
848 | if (copy_from_user(&fprog, optval, sizeof(fprog))) | |
1da177e4 | 849 | break; |
e71a4783 SH |
850 | |
851 | ret = sk_attach_filter(&fprog, sk); | |
852 | } | |
853 | break; | |
854 | ||
855 | case SO_DETACH_FILTER: | |
55b33325 | 856 | ret = sk_detach_filter(sk); |
e71a4783 | 857 | break; |
1da177e4 | 858 | |
d59577b6 VB |
859 | case SO_LOCK_FILTER: |
860 | if (sock_flag(sk, SOCK_FILTER_LOCKED) && !valbool) | |
861 | ret = -EPERM; | |
862 | else | |
863 | sock_valbool_flag(sk, SOCK_FILTER_LOCKED, valbool); | |
864 | break; | |
865 | ||
e71a4783 SH |
866 | case SO_PASSSEC: |
867 | if (valbool) | |
868 | set_bit(SOCK_PASSSEC, &sock->flags); | |
869 | else | |
870 | clear_bit(SOCK_PASSSEC, &sock->flags); | |
871 | break; | |
4a19ec58 | 872 | case SO_MARK: |
5e1fccc0 | 873 | if (!ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN)) |
4a19ec58 | 874 | ret = -EPERM; |
2a91525c | 875 | else |
4a19ec58 | 876 | sk->sk_mark = val; |
4a19ec58 | 877 | break; |
877ce7c1 | 878 | |
1da177e4 LT |
879 | /* We implement the SO_SNDLOWAT etc to |
880 | not be settable (1003.1g 5.3) */ | |
3b885787 | 881 | case SO_RXQ_OVFL: |
8083f0fc | 882 | sock_valbool_flag(sk, SOCK_RXQ_OVFL, valbool); |
3b885787 | 883 | break; |
6e3e939f JB |
884 | |
885 | case SO_WIFI_STATUS: | |
886 | sock_valbool_flag(sk, SOCK_WIFI_STATUS, valbool); | |
887 | break; | |
888 | ||
ef64a54f PE |
889 | case SO_PEEK_OFF: |
890 | if (sock->ops->set_peek_off) | |
891 | sock->ops->set_peek_off(sk, val); | |
892 | else | |
893 | ret = -EOPNOTSUPP; | |
894 | break; | |
3bdc0eba BG |
895 | |
896 | case SO_NOFCS: | |
897 | sock_valbool_flag(sk, SOCK_NOFCS, valbool); | |
898 | break; | |
899 | ||
7d4c04fc KJ |
900 | case SO_SELECT_ERR_QUEUE: |
901 | sock_valbool_flag(sk, SOCK_SELECT_ERR_QUEUE, valbool); | |
902 | break; | |
903 | ||
e0d1095a | 904 | #ifdef CONFIG_NET_RX_BUSY_POLL |
64b0dc51 | 905 | case SO_BUSY_POLL: |
dafcc438 ET |
906 | /* allow unprivileged users to decrease the value */ |
907 | if ((val > sk->sk_ll_usec) && !capable(CAP_NET_ADMIN)) | |
908 | ret = -EPERM; | |
909 | else { | |
910 | if (val < 0) | |
911 | ret = -EINVAL; | |
912 | else | |
913 | sk->sk_ll_usec = val; | |
914 | } | |
915 | break; | |
916 | #endif | |
e71a4783 SH |
917 | default: |
918 | ret = -ENOPROTOOPT; | |
919 | break; | |
4ec93edb | 920 | } |
1da177e4 LT |
921 | release_sock(sk); |
922 | return ret; | |
923 | } | |
2a91525c | 924 | EXPORT_SYMBOL(sock_setsockopt); |
1da177e4 LT |
925 | |
926 | ||
3f551f94 EB |
927 | void cred_to_ucred(struct pid *pid, const struct cred *cred, |
928 | struct ucred *ucred) | |
929 | { | |
930 | ucred->pid = pid_vnr(pid); | |
931 | ucred->uid = ucred->gid = -1; | |
932 | if (cred) { | |
933 | struct user_namespace *current_ns = current_user_ns(); | |
934 | ||
b2e4f544 EB |
935 | ucred->uid = from_kuid_munged(current_ns, cred->euid); |
936 | ucred->gid = from_kgid_munged(current_ns, cred->egid); | |
3f551f94 EB |
937 | } |
938 | } | |
3924773a | 939 | EXPORT_SYMBOL_GPL(cred_to_ucred); |
3f551f94 | 940 | |
1da177e4 LT |
941 | int sock_getsockopt(struct socket *sock, int level, int optname, |
942 | char __user *optval, int __user *optlen) | |
943 | { | |
944 | struct sock *sk = sock->sk; | |
4ec93edb | 945 | |
e71a4783 | 946 | union { |
4ec93edb YH |
947 | int val; |
948 | struct linger ling; | |
1da177e4 LT |
949 | struct timeval tm; |
950 | } v; | |
4ec93edb | 951 | |
4d0392be | 952 | int lv = sizeof(int); |
1da177e4 | 953 | int len; |
4ec93edb | 954 | |
e71a4783 | 955 | if (get_user(len, optlen)) |
4ec93edb | 956 | return -EFAULT; |
e71a4783 | 957 | if (len < 0) |
1da177e4 | 958 | return -EINVAL; |
4ec93edb | 959 | |
50fee1de | 960 | memset(&v, 0, sizeof(v)); |
df0bca04 | 961 | |
2a91525c | 962 | switch (optname) { |
e71a4783 SH |
963 | case SO_DEBUG: |
964 | v.val = sock_flag(sk, SOCK_DBG); | |
965 | break; | |
966 | ||
967 | case SO_DONTROUTE: | |
968 | v.val = sock_flag(sk, SOCK_LOCALROUTE); | |
969 | break; | |
970 | ||
971 | case SO_BROADCAST: | |
1b23a5df | 972 | v.val = sock_flag(sk, SOCK_BROADCAST); |
e71a4783 SH |
973 | break; |
974 | ||
975 | case SO_SNDBUF: | |
976 | v.val = sk->sk_sndbuf; | |
977 | break; | |
978 | ||
979 | case SO_RCVBUF: | |
980 | v.val = sk->sk_rcvbuf; | |
981 | break; | |
982 | ||
983 | case SO_REUSEADDR: | |
984 | v.val = sk->sk_reuse; | |
985 | break; | |
986 | ||
055dc21a TH |
987 | case SO_REUSEPORT: |
988 | v.val = sk->sk_reuseport; | |
989 | break; | |
990 | ||
e71a4783 | 991 | case SO_KEEPALIVE: |
1b23a5df | 992 | v.val = sock_flag(sk, SOCK_KEEPOPEN); |
e71a4783 SH |
993 | break; |
994 | ||
995 | case SO_TYPE: | |
996 | v.val = sk->sk_type; | |
997 | break; | |
998 | ||
49c794e9 JE |
999 | case SO_PROTOCOL: |
1000 | v.val = sk->sk_protocol; | |
1001 | break; | |
1002 | ||
0d6038ee JE |
1003 | case SO_DOMAIN: |
1004 | v.val = sk->sk_family; | |
1005 | break; | |
1006 | ||
e71a4783 SH |
1007 | case SO_ERROR: |
1008 | v.val = -sock_error(sk); | |
2a91525c | 1009 | if (v.val == 0) |
e71a4783 SH |
1010 | v.val = xchg(&sk->sk_err_soft, 0); |
1011 | break; | |
1012 | ||
1013 | case SO_OOBINLINE: | |
1b23a5df | 1014 | v.val = sock_flag(sk, SOCK_URGINLINE); |
e71a4783 SH |
1015 | break; |
1016 | ||
1017 | case SO_NO_CHECK: | |
1018 | v.val = sk->sk_no_check; | |
1019 | break; | |
1020 | ||
1021 | case SO_PRIORITY: | |
1022 | v.val = sk->sk_priority; | |
1023 | break; | |
1024 | ||
1025 | case SO_LINGER: | |
1026 | lv = sizeof(v.ling); | |
1b23a5df | 1027 | v.ling.l_onoff = sock_flag(sk, SOCK_LINGER); |
e71a4783 SH |
1028 | v.ling.l_linger = sk->sk_lingertime / HZ; |
1029 | break; | |
1030 | ||
1031 | case SO_BSDCOMPAT: | |
1032 | sock_warn_obsolete_bsdism("getsockopt"); | |
1033 | break; | |
1034 | ||
1035 | case SO_TIMESTAMP: | |
92f37fd2 ED |
1036 | v.val = sock_flag(sk, SOCK_RCVTSTAMP) && |
1037 | !sock_flag(sk, SOCK_RCVTSTAMPNS); | |
1038 | break; | |
1039 | ||
1040 | case SO_TIMESTAMPNS: | |
1041 | v.val = sock_flag(sk, SOCK_RCVTSTAMPNS); | |
e71a4783 SH |
1042 | break; |
1043 | ||
20d49473 PO |
1044 | case SO_TIMESTAMPING: |
1045 | v.val = 0; | |
1046 | if (sock_flag(sk, SOCK_TIMESTAMPING_TX_HARDWARE)) | |
1047 | v.val |= SOF_TIMESTAMPING_TX_HARDWARE; | |
1048 | if (sock_flag(sk, SOCK_TIMESTAMPING_TX_SOFTWARE)) | |
1049 | v.val |= SOF_TIMESTAMPING_TX_SOFTWARE; | |
1050 | if (sock_flag(sk, SOCK_TIMESTAMPING_RX_HARDWARE)) | |
1051 | v.val |= SOF_TIMESTAMPING_RX_HARDWARE; | |
1052 | if (sock_flag(sk, SOCK_TIMESTAMPING_RX_SOFTWARE)) | |
1053 | v.val |= SOF_TIMESTAMPING_RX_SOFTWARE; | |
1054 | if (sock_flag(sk, SOCK_TIMESTAMPING_SOFTWARE)) | |
1055 | v.val |= SOF_TIMESTAMPING_SOFTWARE; | |
1056 | if (sock_flag(sk, SOCK_TIMESTAMPING_SYS_HARDWARE)) | |
1057 | v.val |= SOF_TIMESTAMPING_SYS_HARDWARE; | |
1058 | if (sock_flag(sk, SOCK_TIMESTAMPING_RAW_HARDWARE)) | |
1059 | v.val |= SOF_TIMESTAMPING_RAW_HARDWARE; | |
1060 | break; | |
1061 | ||
e71a4783 | 1062 | case SO_RCVTIMEO: |
2a91525c | 1063 | lv = sizeof(struct timeval); |
e71a4783 SH |
1064 | if (sk->sk_rcvtimeo == MAX_SCHEDULE_TIMEOUT) { |
1065 | v.tm.tv_sec = 0; | |
1066 | v.tm.tv_usec = 0; | |
1067 | } else { | |
1068 | v.tm.tv_sec = sk->sk_rcvtimeo / HZ; | |
1069 | v.tm.tv_usec = ((sk->sk_rcvtimeo % HZ) * 1000000) / HZ; | |
1070 | } | |
1071 | break; | |
1072 | ||
1073 | case SO_SNDTIMEO: | |
2a91525c | 1074 | lv = sizeof(struct timeval); |
e71a4783 SH |
1075 | if (sk->sk_sndtimeo == MAX_SCHEDULE_TIMEOUT) { |
1076 | v.tm.tv_sec = 0; | |
1077 | v.tm.tv_usec = 0; | |
1078 | } else { | |
1079 | v.tm.tv_sec = sk->sk_sndtimeo / HZ; | |
1080 | v.tm.tv_usec = ((sk->sk_sndtimeo % HZ) * 1000000) / HZ; | |
1081 | } | |
1082 | break; | |
1da177e4 | 1083 | |
e71a4783 SH |
1084 | case SO_RCVLOWAT: |
1085 | v.val = sk->sk_rcvlowat; | |
1086 | break; | |
1da177e4 | 1087 | |
e71a4783 | 1088 | case SO_SNDLOWAT: |
2a91525c | 1089 | v.val = 1; |
e71a4783 | 1090 | break; |
1da177e4 | 1091 | |
e71a4783 | 1092 | case SO_PASSCRED: |
82981930 | 1093 | v.val = !!test_bit(SOCK_PASSCRED, &sock->flags); |
e71a4783 | 1094 | break; |
1da177e4 | 1095 | |
e71a4783 | 1096 | case SO_PEERCRED: |
109f6e39 EB |
1097 | { |
1098 | struct ucred peercred; | |
1099 | if (len > sizeof(peercred)) | |
1100 | len = sizeof(peercred); | |
1101 | cred_to_ucred(sk->sk_peer_pid, sk->sk_peer_cred, &peercred); | |
1102 | if (copy_to_user(optval, &peercred, len)) | |
e71a4783 SH |
1103 | return -EFAULT; |
1104 | goto lenout; | |
109f6e39 | 1105 | } |
1da177e4 | 1106 | |
e71a4783 SH |
1107 | case SO_PEERNAME: |
1108 | { | |
1109 | char address[128]; | |
1110 | ||
1111 | if (sock->ops->getname(sock, (struct sockaddr *)address, &lv, 2)) | |
1112 | return -ENOTCONN; | |
1113 | if (lv < len) | |
1114 | return -EINVAL; | |
1115 | if (copy_to_user(optval, address, len)) | |
1116 | return -EFAULT; | |
1117 | goto lenout; | |
1118 | } | |
1da177e4 | 1119 | |
e71a4783 SH |
1120 | /* Dubious BSD thing... Probably nobody even uses it, but |
1121 | * the UNIX standard wants it for whatever reason... -DaveM | |
1122 | */ | |
1123 | case SO_ACCEPTCONN: | |
1124 | v.val = sk->sk_state == TCP_LISTEN; | |
1125 | break; | |
1da177e4 | 1126 | |
e71a4783 | 1127 | case SO_PASSSEC: |
82981930 | 1128 | v.val = !!test_bit(SOCK_PASSSEC, &sock->flags); |
e71a4783 | 1129 | break; |
877ce7c1 | 1130 | |
e71a4783 SH |
1131 | case SO_PEERSEC: |
1132 | return security_socket_getpeersec_stream(sock, optval, optlen, len); | |
1da177e4 | 1133 | |
4a19ec58 LAT |
1134 | case SO_MARK: |
1135 | v.val = sk->sk_mark; | |
1136 | break; | |
1137 | ||
3b885787 | 1138 | case SO_RXQ_OVFL: |
1b23a5df | 1139 | v.val = sock_flag(sk, SOCK_RXQ_OVFL); |
3b885787 NH |
1140 | break; |
1141 | ||
6e3e939f | 1142 | case SO_WIFI_STATUS: |
1b23a5df | 1143 | v.val = sock_flag(sk, SOCK_WIFI_STATUS); |
6e3e939f JB |
1144 | break; |
1145 | ||
ef64a54f PE |
1146 | case SO_PEEK_OFF: |
1147 | if (!sock->ops->set_peek_off) | |
1148 | return -EOPNOTSUPP; | |
1149 | ||
1150 | v.val = sk->sk_peek_off; | |
1151 | break; | |
bc2f7996 | 1152 | case SO_NOFCS: |
1b23a5df | 1153 | v.val = sock_flag(sk, SOCK_NOFCS); |
bc2f7996 | 1154 | break; |
c91f6df2 | 1155 | |
f7b86bfe | 1156 | case SO_BINDTODEVICE: |
c91f6df2 BH |
1157 | return sock_getbindtodevice(sk, optval, optlen, len); |
1158 | ||
a8fc9277 PE |
1159 | case SO_GET_FILTER: |
1160 | len = sk_get_filter(sk, (struct sock_filter __user *)optval, len); | |
1161 | if (len < 0) | |
1162 | return len; | |
1163 | ||
1164 | goto lenout; | |
c91f6df2 | 1165 | |
d59577b6 VB |
1166 | case SO_LOCK_FILTER: |
1167 | v.val = sock_flag(sk, SOCK_FILTER_LOCKED); | |
1168 | break; | |
1169 | ||
7d4c04fc KJ |
1170 | case SO_SELECT_ERR_QUEUE: |
1171 | v.val = sock_flag(sk, SOCK_SELECT_ERR_QUEUE); | |
1172 | break; | |
1173 | ||
e0d1095a | 1174 | #ifdef CONFIG_NET_RX_BUSY_POLL |
64b0dc51 | 1175 | case SO_BUSY_POLL: |
dafcc438 ET |
1176 | v.val = sk->sk_ll_usec; |
1177 | break; | |
1178 | #endif | |
1179 | ||
e71a4783 SH |
1180 | default: |
1181 | return -ENOPROTOOPT; | |
1da177e4 | 1182 | } |
e71a4783 | 1183 | |
1da177e4 LT |
1184 | if (len > lv) |
1185 | len = lv; | |
1186 | if (copy_to_user(optval, &v, len)) | |
1187 | return -EFAULT; | |
1188 | lenout: | |
4ec93edb YH |
1189 | if (put_user(len, optlen)) |
1190 | return -EFAULT; | |
1191 | return 0; | |
1da177e4 LT |
1192 | } |
1193 | ||
a5b5bb9a IM |
1194 | /* |
1195 | * Initialize an sk_lock. | |
1196 | * | |
1197 | * (We also register the sk_lock with the lock validator.) | |
1198 | */ | |
b6f99a21 | 1199 | static inline void sock_lock_init(struct sock *sk) |
a5b5bb9a | 1200 | { |
ed07536e PZ |
1201 | sock_lock_init_class_and_name(sk, |
1202 | af_family_slock_key_strings[sk->sk_family], | |
1203 | af_family_slock_keys + sk->sk_family, | |
1204 | af_family_key_strings[sk->sk_family], | |
1205 | af_family_keys + sk->sk_family); | |
a5b5bb9a IM |
1206 | } |
1207 | ||
4dc6dc71 ED |
1208 | /* |
1209 | * Copy all fields from osk to nsk but nsk->sk_refcnt must not change yet, | |
1210 | * even temporarly, because of RCU lookups. sk_node should also be left as is. | |
68835aba | 1211 | * We must not copy fields between sk_dontcopy_begin and sk_dontcopy_end |
4dc6dc71 | 1212 | */ |
f1a6c4da PE |
1213 | static void sock_copy(struct sock *nsk, const struct sock *osk) |
1214 | { | |
1215 | #ifdef CONFIG_SECURITY_NETWORK | |
1216 | void *sptr = nsk->sk_security; | |
1217 | #endif | |
68835aba ED |
1218 | memcpy(nsk, osk, offsetof(struct sock, sk_dontcopy_begin)); |
1219 | ||
1220 | memcpy(&nsk->sk_dontcopy_end, &osk->sk_dontcopy_end, | |
1221 | osk->sk_prot->obj_size - offsetof(struct sock, sk_dontcopy_end)); | |
1222 | ||
f1a6c4da PE |
1223 | #ifdef CONFIG_SECURITY_NETWORK |
1224 | nsk->sk_security = sptr; | |
1225 | security_sk_clone(osk, nsk); | |
1226 | #endif | |
1227 | } | |
1228 | ||
fcbdf09d OP |
1229 | void sk_prot_clear_portaddr_nulls(struct sock *sk, int size) |
1230 | { | |
1231 | unsigned long nulls1, nulls2; | |
1232 | ||
1233 | nulls1 = offsetof(struct sock, __sk_common.skc_node.next); | |
1234 | nulls2 = offsetof(struct sock, __sk_common.skc_portaddr_node.next); | |
1235 | if (nulls1 > nulls2) | |
1236 | swap(nulls1, nulls2); | |
1237 | ||
1238 | if (nulls1 != 0) | |
1239 | memset((char *)sk, 0, nulls1); | |
1240 | memset((char *)sk + nulls1 + sizeof(void *), 0, | |
1241 | nulls2 - nulls1 - sizeof(void *)); | |
1242 | memset((char *)sk + nulls2 + sizeof(void *), 0, | |
1243 | size - nulls2 - sizeof(void *)); | |
1244 | } | |
1245 | EXPORT_SYMBOL(sk_prot_clear_portaddr_nulls); | |
1246 | ||
2e4afe7b PE |
1247 | static struct sock *sk_prot_alloc(struct proto *prot, gfp_t priority, |
1248 | int family) | |
c308c1b2 PE |
1249 | { |
1250 | struct sock *sk; | |
1251 | struct kmem_cache *slab; | |
1252 | ||
1253 | slab = prot->slab; | |
e912b114 ED |
1254 | if (slab != NULL) { |
1255 | sk = kmem_cache_alloc(slab, priority & ~__GFP_ZERO); | |
1256 | if (!sk) | |
1257 | return sk; | |
1258 | if (priority & __GFP_ZERO) { | |
fcbdf09d OP |
1259 | if (prot->clear_sk) |
1260 | prot->clear_sk(sk, prot->obj_size); | |
1261 | else | |
1262 | sk_prot_clear_nulls(sk, prot->obj_size); | |
e912b114 | 1263 | } |
fcbdf09d | 1264 | } else |
c308c1b2 PE |
1265 | sk = kmalloc(prot->obj_size, priority); |
1266 | ||
2e4afe7b | 1267 | if (sk != NULL) { |
a98b65a3 VN |
1268 | kmemcheck_annotate_bitfield(sk, flags); |
1269 | ||
2e4afe7b PE |
1270 | if (security_sk_alloc(sk, family, priority)) |
1271 | goto out_free; | |
1272 | ||
1273 | if (!try_module_get(prot->owner)) | |
1274 | goto out_free_sec; | |
e022f0b4 | 1275 | sk_tx_queue_clear(sk); |
2e4afe7b PE |
1276 | } |
1277 | ||
c308c1b2 | 1278 | return sk; |
2e4afe7b PE |
1279 | |
1280 | out_free_sec: | |
1281 | security_sk_free(sk); | |
1282 | out_free: | |
1283 | if (slab != NULL) | |
1284 | kmem_cache_free(slab, sk); | |
1285 | else | |
1286 | kfree(sk); | |
1287 | return NULL; | |
c308c1b2 PE |
1288 | } |
1289 | ||
1290 | static void sk_prot_free(struct proto *prot, struct sock *sk) | |
1291 | { | |
1292 | struct kmem_cache *slab; | |
2e4afe7b | 1293 | struct module *owner; |
c308c1b2 | 1294 | |
2e4afe7b | 1295 | owner = prot->owner; |
c308c1b2 | 1296 | slab = prot->slab; |
2e4afe7b PE |
1297 | |
1298 | security_sk_free(sk); | |
c308c1b2 PE |
1299 | if (slab != NULL) |
1300 | kmem_cache_free(slab, sk); | |
1301 | else | |
1302 | kfree(sk); | |
2e4afe7b | 1303 | module_put(owner); |
c308c1b2 PE |
1304 | } |
1305 | ||
8fb974c9 | 1306 | #if IS_ENABLED(CONFIG_NET_CLS_CGROUP) |
211d2f97 | 1307 | void sock_update_classid(struct sock *sk) |
f8451725 | 1308 | { |
1144182a | 1309 | u32 classid; |
f8451725 | 1310 | |
211d2f97 | 1311 | classid = task_cls_classid(current); |
3afa6d00 | 1312 | if (classid != sk->sk_classid) |
f8451725 HX |
1313 | sk->sk_classid = classid; |
1314 | } | |
82862742 | 1315 | EXPORT_SYMBOL(sock_update_classid); |
8fb974c9 | 1316 | #endif |
5bc1421e | 1317 | |
51e4e7fa | 1318 | #if IS_ENABLED(CONFIG_NETPRIO_CGROUP) |
6ffd4641 | 1319 | void sock_update_netprioidx(struct sock *sk) |
5bc1421e | 1320 | { |
5bc1421e NH |
1321 | if (in_interrupt()) |
1322 | return; | |
2b73bc65 | 1323 | |
6ffd4641 | 1324 | sk->sk_cgrp_prioidx = task_netprioidx(current); |
5bc1421e NH |
1325 | } |
1326 | EXPORT_SYMBOL_GPL(sock_update_netprioidx); | |
f8451725 HX |
1327 | #endif |
1328 | ||
1da177e4 LT |
1329 | /** |
1330 | * sk_alloc - All socket objects are allocated here | |
c4ea43c5 | 1331 | * @net: the applicable net namespace |
4dc3b16b PP |
1332 | * @family: protocol family |
1333 | * @priority: for allocation (%GFP_KERNEL, %GFP_ATOMIC, etc) | |
1334 | * @prot: struct proto associated with this new sock instance | |
1da177e4 | 1335 | */ |
1b8d7ae4 | 1336 | struct sock *sk_alloc(struct net *net, int family, gfp_t priority, |
6257ff21 | 1337 | struct proto *prot) |
1da177e4 | 1338 | { |
c308c1b2 | 1339 | struct sock *sk; |
1da177e4 | 1340 | |
154adbc8 | 1341 | sk = sk_prot_alloc(prot, priority | __GFP_ZERO, family); |
1da177e4 | 1342 | if (sk) { |
154adbc8 PE |
1343 | sk->sk_family = family; |
1344 | /* | |
1345 | * See comment in struct sock definition to understand | |
1346 | * why we need sk_prot_creator -acme | |
1347 | */ | |
1348 | sk->sk_prot = sk->sk_prot_creator = prot; | |
1349 | sock_lock_init(sk); | |
3b1e0a65 | 1350 | sock_net_set(sk, get_net(net)); |
d66ee058 | 1351 | atomic_set(&sk->sk_wmem_alloc, 1); |
f8451725 | 1352 | |
211d2f97 | 1353 | sock_update_classid(sk); |
6ffd4641 | 1354 | sock_update_netprioidx(sk); |
1da177e4 | 1355 | } |
a79af59e | 1356 | |
2e4afe7b | 1357 | return sk; |
1da177e4 | 1358 | } |
2a91525c | 1359 | EXPORT_SYMBOL(sk_alloc); |
1da177e4 | 1360 | |
2b85a34e | 1361 | static void __sk_free(struct sock *sk) |
1da177e4 LT |
1362 | { |
1363 | struct sk_filter *filter; | |
1da177e4 LT |
1364 | |
1365 | if (sk->sk_destruct) | |
1366 | sk->sk_destruct(sk); | |
1367 | ||
a898def2 PM |
1368 | filter = rcu_dereference_check(sk->sk_filter, |
1369 | atomic_read(&sk->sk_wmem_alloc) == 0); | |
1da177e4 | 1370 | if (filter) { |
309dd5fc | 1371 | sk_filter_uncharge(sk, filter); |
a9b3cd7f | 1372 | RCU_INIT_POINTER(sk->sk_filter, NULL); |
1da177e4 LT |
1373 | } |
1374 | ||
08e29af3 | 1375 | sock_disable_timestamp(sk, SK_FLAGS_TIMESTAMP); |
1da177e4 LT |
1376 | |
1377 | if (atomic_read(&sk->sk_omem_alloc)) | |
e005d193 JP |
1378 | pr_debug("%s: optmem leakage (%d bytes) detected\n", |
1379 | __func__, atomic_read(&sk->sk_omem_alloc)); | |
1da177e4 | 1380 | |
109f6e39 EB |
1381 | if (sk->sk_peer_cred) |
1382 | put_cred(sk->sk_peer_cred); | |
1383 | put_pid(sk->sk_peer_pid); | |
3b1e0a65 | 1384 | put_net(sock_net(sk)); |
c308c1b2 | 1385 | sk_prot_free(sk->sk_prot_creator, sk); |
1da177e4 | 1386 | } |
2b85a34e ED |
1387 | |
1388 | void sk_free(struct sock *sk) | |
1389 | { | |
1390 | /* | |
25985edc | 1391 | * We subtract one from sk_wmem_alloc and can know if |
2b85a34e ED |
1392 | * some packets are still in some tx queue. |
1393 | * If not null, sock_wfree() will call __sk_free(sk) later | |
1394 | */ | |
1395 | if (atomic_dec_and_test(&sk->sk_wmem_alloc)) | |
1396 | __sk_free(sk); | |
1397 | } | |
2a91525c | 1398 | EXPORT_SYMBOL(sk_free); |
1da177e4 | 1399 | |
edf02087 | 1400 | /* |
25985edc LDM |
1401 | * Last sock_put should drop reference to sk->sk_net. It has already |
1402 | * been dropped in sk_change_net. Taking reference to stopping namespace | |
edf02087 | 1403 | * is not an option. |
25985edc | 1404 | * Take reference to a socket to remove it from hash _alive_ and after that |
edf02087 DL |
1405 | * destroy it in the context of init_net. |
1406 | */ | |
1407 | void sk_release_kernel(struct sock *sk) | |
1408 | { | |
1409 | if (sk == NULL || sk->sk_socket == NULL) | |
1410 | return; | |
1411 | ||
1412 | sock_hold(sk); | |
1413 | sock_release(sk->sk_socket); | |
65a18ec5 | 1414 | release_net(sock_net(sk)); |
3b1e0a65 | 1415 | sock_net_set(sk, get_net(&init_net)); |
edf02087 DL |
1416 | sock_put(sk); |
1417 | } | |
45af1754 | 1418 | EXPORT_SYMBOL(sk_release_kernel); |
edf02087 | 1419 | |
475f1b52 SR |
1420 | static void sk_update_clone(const struct sock *sk, struct sock *newsk) |
1421 | { | |
1422 | if (mem_cgroup_sockets_enabled && sk->sk_cgrp) | |
1423 | sock_update_memcg(newsk); | |
1424 | } | |
1425 | ||
e56c57d0 ED |
1426 | /** |
1427 | * sk_clone_lock - clone a socket, and lock its clone | |
1428 | * @sk: the socket to clone | |
1429 | * @priority: for allocation (%GFP_KERNEL, %GFP_ATOMIC, etc) | |
1430 | * | |
1431 | * Caller must unlock socket even in error path (bh_unlock_sock(newsk)) | |
1432 | */ | |
1433 | struct sock *sk_clone_lock(const struct sock *sk, const gfp_t priority) | |
87d11ceb | 1434 | { |
8fd1d178 | 1435 | struct sock *newsk; |
87d11ceb | 1436 | |
8fd1d178 | 1437 | newsk = sk_prot_alloc(sk->sk_prot, priority, sk->sk_family); |
87d11ceb ACM |
1438 | if (newsk != NULL) { |
1439 | struct sk_filter *filter; | |
1440 | ||
892c141e | 1441 | sock_copy(newsk, sk); |
87d11ceb ACM |
1442 | |
1443 | /* SANITY */ | |
3b1e0a65 | 1444 | get_net(sock_net(newsk)); |
87d11ceb ACM |
1445 | sk_node_init(&newsk->sk_node); |
1446 | sock_lock_init(newsk); | |
1447 | bh_lock_sock(newsk); | |
fa438ccf | 1448 | newsk->sk_backlog.head = newsk->sk_backlog.tail = NULL; |
8eae939f | 1449 | newsk->sk_backlog.len = 0; |
87d11ceb ACM |
1450 | |
1451 | atomic_set(&newsk->sk_rmem_alloc, 0); | |
2b85a34e ED |
1452 | /* |
1453 | * sk_wmem_alloc set to one (see sk_free() and sock_wfree()) | |
1454 | */ | |
1455 | atomic_set(&newsk->sk_wmem_alloc, 1); | |
87d11ceb ACM |
1456 | atomic_set(&newsk->sk_omem_alloc, 0); |
1457 | skb_queue_head_init(&newsk->sk_receive_queue); | |
1458 | skb_queue_head_init(&newsk->sk_write_queue); | |
97fc2f08 CL |
1459 | #ifdef CONFIG_NET_DMA |
1460 | skb_queue_head_init(&newsk->sk_async_wait_queue); | |
1461 | #endif | |
87d11ceb | 1462 | |
b6c6712a | 1463 | spin_lock_init(&newsk->sk_dst_lock); |
87d11ceb | 1464 | rwlock_init(&newsk->sk_callback_lock); |
443aef0e PZ |
1465 | lockdep_set_class_and_name(&newsk->sk_callback_lock, |
1466 | af_callback_keys + newsk->sk_family, | |
1467 | af_family_clock_key_strings[newsk->sk_family]); | |
87d11ceb ACM |
1468 | |
1469 | newsk->sk_dst_cache = NULL; | |
1470 | newsk->sk_wmem_queued = 0; | |
1471 | newsk->sk_forward_alloc = 0; | |
1472 | newsk->sk_send_head = NULL; | |
87d11ceb ACM |
1473 | newsk->sk_userlocks = sk->sk_userlocks & ~SOCK_BINDPORT_LOCK; |
1474 | ||
1475 | sock_reset_flag(newsk, SOCK_DONE); | |
1476 | skb_queue_head_init(&newsk->sk_error_queue); | |
1477 | ||
0d7da9dd | 1478 | filter = rcu_dereference_protected(newsk->sk_filter, 1); |
87d11ceb ACM |
1479 | if (filter != NULL) |
1480 | sk_filter_charge(newsk, filter); | |
1481 | ||
1482 | if (unlikely(xfrm_sk_clone_policy(newsk))) { | |
1483 | /* It is still raw copy of parent, so invalidate | |
1484 | * destructor and make plain sk_free() */ | |
1485 | newsk->sk_destruct = NULL; | |
b0691c8e | 1486 | bh_unlock_sock(newsk); |
87d11ceb ACM |
1487 | sk_free(newsk); |
1488 | newsk = NULL; | |
1489 | goto out; | |
1490 | } | |
1491 | ||
1492 | newsk->sk_err = 0; | |
1493 | newsk->sk_priority = 0; | |
4dc6dc71 ED |
1494 | /* |
1495 | * Before updating sk_refcnt, we must commit prior changes to memory | |
1496 | * (Documentation/RCU/rculist_nulls.txt for details) | |
1497 | */ | |
1498 | smp_wmb(); | |
87d11ceb ACM |
1499 | atomic_set(&newsk->sk_refcnt, 2); |
1500 | ||
1501 | /* | |
1502 | * Increment the counter in the same struct proto as the master | |
1503 | * sock (sk_refcnt_debug_inc uses newsk->sk_prot->socks, that | |
1504 | * is the same as sk->sk_prot->socks, as this field was copied | |
1505 | * with memcpy). | |
1506 | * | |
1507 | * This _changes_ the previous behaviour, where | |
1508 | * tcp_create_openreq_child always was incrementing the | |
1509 | * equivalent to tcp_prot->socks (inet_sock_nr), so this have | |
1510 | * to be taken into account in all callers. -acme | |
1511 | */ | |
1512 | sk_refcnt_debug_inc(newsk); | |
972692e0 | 1513 | sk_set_socket(newsk, NULL); |
43815482 | 1514 | newsk->sk_wq = NULL; |
87d11ceb | 1515 | |
f3f511e1 GC |
1516 | sk_update_clone(sk, newsk); |
1517 | ||
87d11ceb | 1518 | if (newsk->sk_prot->sockets_allocated) |
180d8cd9 | 1519 | sk_sockets_allocated_inc(newsk); |
704da560 | 1520 | |
08e29af3 | 1521 | if (newsk->sk_flags & SK_FLAGS_TIMESTAMP) |
704da560 | 1522 | net_enable_timestamp(); |
87d11ceb ACM |
1523 | } |
1524 | out: | |
1525 | return newsk; | |
1526 | } | |
e56c57d0 | 1527 | EXPORT_SYMBOL_GPL(sk_clone_lock); |
87d11ceb | 1528 | |
9958089a AK |
1529 | void sk_setup_caps(struct sock *sk, struct dst_entry *dst) |
1530 | { | |
1531 | __sk_dst_set(sk, dst); | |
1532 | sk->sk_route_caps = dst->dev->features; | |
1533 | if (sk->sk_route_caps & NETIF_F_GSO) | |
4fcd6b99 | 1534 | sk->sk_route_caps |= NETIF_F_GSO_SOFTWARE; |
a465419b | 1535 | sk->sk_route_caps &= ~sk->sk_route_nocaps; |
9958089a | 1536 | if (sk_can_gso(sk)) { |
82cc1a7a | 1537 | if (dst->header_len) { |
9958089a | 1538 | sk->sk_route_caps &= ~NETIF_F_GSO_MASK; |
82cc1a7a | 1539 | } else { |
9958089a | 1540 | sk->sk_route_caps |= NETIF_F_SG | NETIF_F_HW_CSUM; |
82cc1a7a | 1541 | sk->sk_gso_max_size = dst->dev->gso_max_size; |
1485348d | 1542 | sk->sk_gso_max_segs = dst->dev->gso_max_segs; |
82cc1a7a | 1543 | } |
9958089a AK |
1544 | } |
1545 | } | |
1546 | EXPORT_SYMBOL_GPL(sk_setup_caps); | |
1547 | ||
1da177e4 LT |
1548 | /* |
1549 | * Simple resource managers for sockets. | |
1550 | */ | |
1551 | ||
1552 | ||
4ec93edb YH |
1553 | /* |
1554 | * Write buffer destructor automatically called from kfree_skb. | |
1da177e4 LT |
1555 | */ |
1556 | void sock_wfree(struct sk_buff *skb) | |
1557 | { | |
1558 | struct sock *sk = skb->sk; | |
d99927f4 | 1559 | unsigned int len = skb->truesize; |
1da177e4 | 1560 | |
d99927f4 ED |
1561 | if (!sock_flag(sk, SOCK_USE_WRITE_QUEUE)) { |
1562 | /* | |
1563 | * Keep a reference on sk_wmem_alloc, this will be released | |
1564 | * after sk_write_space() call | |
1565 | */ | |
1566 | atomic_sub(len - 1, &sk->sk_wmem_alloc); | |
1da177e4 | 1567 | sk->sk_write_space(sk); |
d99927f4 ED |
1568 | len = 1; |
1569 | } | |
2b85a34e | 1570 | /* |
d99927f4 ED |
1571 | * if sk_wmem_alloc reaches 0, we must finish what sk_free() |
1572 | * could not do because of in-flight packets | |
2b85a34e | 1573 | */ |
d99927f4 | 1574 | if (atomic_sub_and_test(len, &sk->sk_wmem_alloc)) |
2b85a34e | 1575 | __sk_free(sk); |
1da177e4 | 1576 | } |
2a91525c | 1577 | EXPORT_SYMBOL(sock_wfree); |
1da177e4 | 1578 | |
f2f872f9 ED |
1579 | void skb_orphan_partial(struct sk_buff *skb) |
1580 | { | |
1581 | /* TCP stack sets skb->ooo_okay based on sk_wmem_alloc, | |
1582 | * so we do not completely orphan skb, but transfert all | |
1583 | * accounted bytes but one, to avoid unexpected reorders. | |
1584 | */ | |
1585 | if (skb->destructor == sock_wfree | |
1586 | #ifdef CONFIG_INET | |
1587 | || skb->destructor == tcp_wfree | |
1588 | #endif | |
1589 | ) { | |
1590 | atomic_sub(skb->truesize - 1, &skb->sk->sk_wmem_alloc); | |
1591 | skb->truesize = 1; | |
1592 | } else { | |
1593 | skb_orphan(skb); | |
1594 | } | |
1595 | } | |
1596 | EXPORT_SYMBOL(skb_orphan_partial); | |
1597 | ||
4ec93edb YH |
1598 | /* |
1599 | * Read buffer destructor automatically called from kfree_skb. | |
1da177e4 LT |
1600 | */ |
1601 | void sock_rfree(struct sk_buff *skb) | |
1602 | { | |
1603 | struct sock *sk = skb->sk; | |
d361fd59 | 1604 | unsigned int len = skb->truesize; |
1da177e4 | 1605 | |
d361fd59 ED |
1606 | atomic_sub(len, &sk->sk_rmem_alloc); |
1607 | sk_mem_uncharge(sk, len); | |
1da177e4 | 1608 | } |
2a91525c | 1609 | EXPORT_SYMBOL(sock_rfree); |
1da177e4 | 1610 | |
41063e9d DM |
1611 | void sock_edemux(struct sk_buff *skb) |
1612 | { | |
e812347c ED |
1613 | struct sock *sk = skb->sk; |
1614 | ||
1c463e57 | 1615 | #ifdef CONFIG_INET |
e812347c ED |
1616 | if (sk->sk_state == TCP_TIME_WAIT) |
1617 | inet_twsk_put(inet_twsk(sk)); | |
1618 | else | |
1c463e57 | 1619 | #endif |
e812347c | 1620 | sock_put(sk); |
41063e9d DM |
1621 | } |
1622 | EXPORT_SYMBOL(sock_edemux); | |
1da177e4 | 1623 | |
976d0201 | 1624 | kuid_t sock_i_uid(struct sock *sk) |
1da177e4 | 1625 | { |
976d0201 | 1626 | kuid_t uid; |
1da177e4 | 1627 | |
f064af1e | 1628 | read_lock_bh(&sk->sk_callback_lock); |
976d0201 | 1629 | uid = sk->sk_socket ? SOCK_INODE(sk->sk_socket)->i_uid : GLOBAL_ROOT_UID; |
f064af1e | 1630 | read_unlock_bh(&sk->sk_callback_lock); |
1da177e4 LT |
1631 | return uid; |
1632 | } | |
2a91525c | 1633 | EXPORT_SYMBOL(sock_i_uid); |
1da177e4 LT |
1634 | |
1635 | unsigned long sock_i_ino(struct sock *sk) | |
1636 | { | |
1637 | unsigned long ino; | |
1638 | ||
f064af1e | 1639 | read_lock_bh(&sk->sk_callback_lock); |
1da177e4 | 1640 | ino = sk->sk_socket ? SOCK_INODE(sk->sk_socket)->i_ino : 0; |
f064af1e | 1641 | read_unlock_bh(&sk->sk_callback_lock); |
1da177e4 LT |
1642 | return ino; |
1643 | } | |
2a91525c | 1644 | EXPORT_SYMBOL(sock_i_ino); |
1da177e4 LT |
1645 | |
1646 | /* | |
1647 | * Allocate a skb from the socket's send buffer. | |
1648 | */ | |
86a76caf | 1649 | struct sk_buff *sock_wmalloc(struct sock *sk, unsigned long size, int force, |
dd0fc66f | 1650 | gfp_t priority) |
1da177e4 LT |
1651 | { |
1652 | if (force || atomic_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf) { | |
2a91525c | 1653 | struct sk_buff *skb = alloc_skb(size, priority); |
1da177e4 LT |
1654 | if (skb) { |
1655 | skb_set_owner_w(skb, sk); | |
1656 | return skb; | |
1657 | } | |
1658 | } | |
1659 | return NULL; | |
1660 | } | |
2a91525c | 1661 | EXPORT_SYMBOL(sock_wmalloc); |
1da177e4 LT |
1662 | |
1663 | /* | |
1664 | * Allocate a skb from the socket's receive buffer. | |
4ec93edb | 1665 | */ |
86a76caf | 1666 | struct sk_buff *sock_rmalloc(struct sock *sk, unsigned long size, int force, |
dd0fc66f | 1667 | gfp_t priority) |
1da177e4 LT |
1668 | { |
1669 | if (force || atomic_read(&sk->sk_rmem_alloc) < sk->sk_rcvbuf) { | |
1670 | struct sk_buff *skb = alloc_skb(size, priority); | |
1671 | if (skb) { | |
1672 | skb_set_owner_r(skb, sk); | |
1673 | return skb; | |
1674 | } | |
1675 | } | |
1676 | return NULL; | |
1677 | } | |
1678 | ||
4ec93edb | 1679 | /* |
1da177e4 | 1680 | * Allocate a memory block from the socket's option memory buffer. |
4ec93edb | 1681 | */ |
dd0fc66f | 1682 | void *sock_kmalloc(struct sock *sk, int size, gfp_t priority) |
1da177e4 | 1683 | { |
95c96174 | 1684 | if ((unsigned int)size <= sysctl_optmem_max && |
1da177e4 LT |
1685 | atomic_read(&sk->sk_omem_alloc) + size < sysctl_optmem_max) { |
1686 | void *mem; | |
1687 | /* First do the add, to avoid the race if kmalloc | |
4ec93edb | 1688 | * might sleep. |
1da177e4 LT |
1689 | */ |
1690 | atomic_add(size, &sk->sk_omem_alloc); | |
1691 | mem = kmalloc(size, priority); | |
1692 | if (mem) | |
1693 | return mem; | |
1694 | atomic_sub(size, &sk->sk_omem_alloc); | |
1695 | } | |
1696 | return NULL; | |
1697 | } | |
2a91525c | 1698 | EXPORT_SYMBOL(sock_kmalloc); |
1da177e4 LT |
1699 | |
1700 | /* | |
1701 | * Free an option memory block. | |
1702 | */ | |
1703 | void sock_kfree_s(struct sock *sk, void *mem, int size) | |
1704 | { | |
1705 | kfree(mem); | |
1706 | atomic_sub(size, &sk->sk_omem_alloc); | |
1707 | } | |
2a91525c | 1708 | EXPORT_SYMBOL(sock_kfree_s); |
1da177e4 LT |
1709 | |
1710 | /* It is almost wait_for_tcp_memory minus release_sock/lock_sock. | |
1711 | I think, these locks should be removed for datagram sockets. | |
1712 | */ | |
2a91525c | 1713 | static long sock_wait_for_wmem(struct sock *sk, long timeo) |
1da177e4 LT |
1714 | { |
1715 | DEFINE_WAIT(wait); | |
1716 | ||
1717 | clear_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags); | |
1718 | for (;;) { | |
1719 | if (!timeo) | |
1720 | break; | |
1721 | if (signal_pending(current)) | |
1722 | break; | |
1723 | set_bit(SOCK_NOSPACE, &sk->sk_socket->flags); | |
aa395145 | 1724 | prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE); |
1da177e4 LT |
1725 | if (atomic_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf) |
1726 | break; | |
1727 | if (sk->sk_shutdown & SEND_SHUTDOWN) | |
1728 | break; | |
1729 | if (sk->sk_err) | |
1730 | break; | |
1731 | timeo = schedule_timeout(timeo); | |
1732 | } | |
aa395145 | 1733 | finish_wait(sk_sleep(sk), &wait); |
1da177e4 LT |
1734 | return timeo; |
1735 | } | |
1736 | ||
1737 | ||
1738 | /* | |
1739 | * Generic send/receive buffer handlers | |
1740 | */ | |
1741 | ||
4cc7f68d HX |
1742 | struct sk_buff *sock_alloc_send_pskb(struct sock *sk, unsigned long header_len, |
1743 | unsigned long data_len, int noblock, | |
28d64271 | 1744 | int *errcode, int max_page_order) |
1da177e4 | 1745 | { |
28d64271 ED |
1746 | struct sk_buff *skb = NULL; |
1747 | unsigned long chunk; | |
7d877f3b | 1748 | gfp_t gfp_mask; |
1da177e4 LT |
1749 | long timeo; |
1750 | int err; | |
cc9b17ad | 1751 | int npages = (data_len + (PAGE_SIZE - 1)) >> PAGE_SHIFT; |
28d64271 ED |
1752 | struct page *page; |
1753 | int i; | |
cc9b17ad JW |
1754 | |
1755 | err = -EMSGSIZE; | |
1756 | if (npages > MAX_SKB_FRAGS) | |
1757 | goto failure; | |
1da177e4 | 1758 | |
1da177e4 | 1759 | timeo = sock_sndtimeo(sk, noblock); |
28d64271 | 1760 | while (!skb) { |
1da177e4 LT |
1761 | err = sock_error(sk); |
1762 | if (err != 0) | |
1763 | goto failure; | |
1764 | ||
1765 | err = -EPIPE; | |
1766 | if (sk->sk_shutdown & SEND_SHUTDOWN) | |
1767 | goto failure; | |
1768 | ||
28d64271 ED |
1769 | if (atomic_read(&sk->sk_wmem_alloc) >= sk->sk_sndbuf) { |
1770 | set_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags); | |
1771 | set_bit(SOCK_NOSPACE, &sk->sk_socket->flags); | |
1772 | err = -EAGAIN; | |
1773 | if (!timeo) | |
1774 | goto failure; | |
1775 | if (signal_pending(current)) | |
1776 | goto interrupted; | |
1777 | timeo = sock_wait_for_wmem(sk, timeo); | |
1778 | continue; | |
1779 | } | |
1da177e4 | 1780 | |
28d64271 ED |
1781 | err = -ENOBUFS; |
1782 | gfp_mask = sk->sk_allocation; | |
1783 | if (gfp_mask & __GFP_WAIT) | |
1784 | gfp_mask |= __GFP_REPEAT; | |
1785 | ||
1786 | skb = alloc_skb(header_len, gfp_mask); | |
1787 | if (!skb) | |
1da177e4 | 1788 | goto failure; |
28d64271 ED |
1789 | |
1790 | skb->truesize += data_len; | |
1791 | ||
1792 | for (i = 0; npages > 0; i++) { | |
1793 | int order = max_page_order; | |
1794 | ||
1795 | while (order) { | |
1796 | if (npages >= 1 << order) { | |
1797 | page = alloc_pages(sk->sk_allocation | | |
1798 | __GFP_COMP | __GFP_NOWARN, | |
1799 | order); | |
1800 | if (page) | |
1801 | goto fill_page; | |
1802 | } | |
1803 | order--; | |
1804 | } | |
1805 | page = alloc_page(sk->sk_allocation); | |
1806 | if (!page) | |
1807 | goto failure; | |
1808 | fill_page: | |
1809 | chunk = min_t(unsigned long, data_len, | |
1810 | PAGE_SIZE << order); | |
1811 | skb_fill_page_desc(skb, i, page, 0, chunk); | |
1812 | data_len -= chunk; | |
1813 | npages -= 1 << order; | |
1da177e4 | 1814 | } |
1da177e4 LT |
1815 | } |
1816 | ||
1817 | skb_set_owner_w(skb, sk); | |
1818 | return skb; | |
1819 | ||
1820 | interrupted: | |
1821 | err = sock_intr_errno(timeo); | |
1822 | failure: | |
28d64271 | 1823 | kfree_skb(skb); |
1da177e4 LT |
1824 | *errcode = err; |
1825 | return NULL; | |
1826 | } | |
4cc7f68d | 1827 | EXPORT_SYMBOL(sock_alloc_send_pskb); |
1da177e4 | 1828 | |
4ec93edb | 1829 | struct sk_buff *sock_alloc_send_skb(struct sock *sk, unsigned long size, |
1da177e4 LT |
1830 | int noblock, int *errcode) |
1831 | { | |
28d64271 | 1832 | return sock_alloc_send_pskb(sk, size, 0, noblock, errcode, 0); |
1da177e4 | 1833 | } |
2a91525c | 1834 | EXPORT_SYMBOL(sock_alloc_send_skb); |
1da177e4 | 1835 | |
5640f768 ED |
1836 | /* On 32bit arches, an skb frag is limited to 2^15 */ |
1837 | #define SKB_FRAG_PAGE_ORDER get_order(32768) | |
1838 | ||
1839 | bool sk_page_frag_refill(struct sock *sk, struct page_frag *pfrag) | |
1840 | { | |
1841 | int order; | |
1842 | ||
1843 | if (pfrag->page) { | |
1844 | if (atomic_read(&pfrag->page->_count) == 1) { | |
1845 | pfrag->offset = 0; | |
1846 | return true; | |
1847 | } | |
1848 | if (pfrag->offset < pfrag->size) | |
1849 | return true; | |
1850 | put_page(pfrag->page); | |
1851 | } | |
1852 | ||
1853 | /* We restrict high order allocations to users that can afford to wait */ | |
1854 | order = (sk->sk_allocation & __GFP_WAIT) ? SKB_FRAG_PAGE_ORDER : 0; | |
1855 | ||
1856 | do { | |
1857 | gfp_t gfp = sk->sk_allocation; | |
1858 | ||
1859 | if (order) | |
1860 | gfp |= __GFP_COMP | __GFP_NOWARN; | |
1861 | pfrag->page = alloc_pages(gfp, order); | |
1862 | if (likely(pfrag->page)) { | |
1863 | pfrag->offset = 0; | |
1864 | pfrag->size = PAGE_SIZE << order; | |
1865 | return true; | |
1866 | } | |
1867 | } while (--order >= 0); | |
1868 | ||
1869 | sk_enter_memory_pressure(sk); | |
1870 | sk_stream_moderate_sndbuf(sk); | |
1871 | return false; | |
1872 | } | |
1873 | EXPORT_SYMBOL(sk_page_frag_refill); | |
1874 | ||
1da177e4 | 1875 | static void __lock_sock(struct sock *sk) |
f39234d6 NK |
1876 | __releases(&sk->sk_lock.slock) |
1877 | __acquires(&sk->sk_lock.slock) | |
1da177e4 LT |
1878 | { |
1879 | DEFINE_WAIT(wait); | |
1880 | ||
e71a4783 | 1881 | for (;;) { |
1da177e4 LT |
1882 | prepare_to_wait_exclusive(&sk->sk_lock.wq, &wait, |
1883 | TASK_UNINTERRUPTIBLE); | |
1884 | spin_unlock_bh(&sk->sk_lock.slock); | |
1885 | schedule(); | |
1886 | spin_lock_bh(&sk->sk_lock.slock); | |
e71a4783 | 1887 | if (!sock_owned_by_user(sk)) |
1da177e4 LT |
1888 | break; |
1889 | } | |
1890 | finish_wait(&sk->sk_lock.wq, &wait); | |
1891 | } | |
1892 | ||
1893 | static void __release_sock(struct sock *sk) | |
f39234d6 NK |
1894 | __releases(&sk->sk_lock.slock) |
1895 | __acquires(&sk->sk_lock.slock) | |
1da177e4 LT |
1896 | { |
1897 | struct sk_buff *skb = sk->sk_backlog.head; | |
1898 | ||
1899 | do { | |
1900 | sk->sk_backlog.head = sk->sk_backlog.tail = NULL; | |
1901 | bh_unlock_sock(sk); | |
1902 | ||
1903 | do { | |
1904 | struct sk_buff *next = skb->next; | |
1905 | ||
e4cbb02a | 1906 | prefetch(next); |
7fee226a | 1907 | WARN_ON_ONCE(skb_dst_is_noref(skb)); |
1da177e4 | 1908 | skb->next = NULL; |
c57943a1 | 1909 | sk_backlog_rcv(sk, skb); |
1da177e4 LT |
1910 | |
1911 | /* | |
1912 | * We are in process context here with softirqs | |
1913 | * disabled, use cond_resched_softirq() to preempt. | |
1914 | * This is safe to do because we've taken the backlog | |
1915 | * queue private: | |
1916 | */ | |
1917 | cond_resched_softirq(); | |
1918 | ||
1919 | skb = next; | |
1920 | } while (skb != NULL); | |
1921 | ||
1922 | bh_lock_sock(sk); | |
e71a4783 | 1923 | } while ((skb = sk->sk_backlog.head) != NULL); |
8eae939f ZY |
1924 | |
1925 | /* | |
1926 | * Doing the zeroing here guarantee we can not loop forever | |
1927 | * while a wild producer attempts to flood us. | |
1928 | */ | |
1929 | sk->sk_backlog.len = 0; | |
1da177e4 LT |
1930 | } |
1931 | ||
1932 | /** | |
1933 | * sk_wait_data - wait for data to arrive at sk_receive_queue | |
4dc3b16b PP |
1934 | * @sk: sock to wait on |
1935 | * @timeo: for how long | |
1da177e4 LT |
1936 | * |
1937 | * Now socket state including sk->sk_err is changed only under lock, | |
1938 | * hence we may omit checks after joining wait queue. | |
1939 | * We check receive queue before schedule() only as optimization; | |
1940 | * it is very likely that release_sock() added new data. | |
1941 | */ | |
1942 | int sk_wait_data(struct sock *sk, long *timeo) | |
1943 | { | |
1944 | int rc; | |
1945 | DEFINE_WAIT(wait); | |
1946 | ||
aa395145 | 1947 | prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE); |
1da177e4 LT |
1948 | set_bit(SOCK_ASYNC_WAITDATA, &sk->sk_socket->flags); |
1949 | rc = sk_wait_event(sk, timeo, !skb_queue_empty(&sk->sk_receive_queue)); | |
1950 | clear_bit(SOCK_ASYNC_WAITDATA, &sk->sk_socket->flags); | |
aa395145 | 1951 | finish_wait(sk_sleep(sk), &wait); |
1da177e4 LT |
1952 | return rc; |
1953 | } | |
1da177e4 LT |
1954 | EXPORT_SYMBOL(sk_wait_data); |
1955 | ||
3ab224be HA |
1956 | /** |
1957 | * __sk_mem_schedule - increase sk_forward_alloc and memory_allocated | |
1958 | * @sk: socket | |
1959 | * @size: memory size to allocate | |
1960 | * @kind: allocation type | |
1961 | * | |
1962 | * If kind is SK_MEM_SEND, it means wmem allocation. Otherwise it means | |
1963 | * rmem allocation. This function assumes that protocols which have | |
1964 | * memory_pressure use sk_wmem_queued as write buffer accounting. | |
1965 | */ | |
1966 | int __sk_mem_schedule(struct sock *sk, int size, int kind) | |
1967 | { | |
1968 | struct proto *prot = sk->sk_prot; | |
1969 | int amt = sk_mem_pages(size); | |
8d987e5c | 1970 | long allocated; |
e1aab161 | 1971 | int parent_status = UNDER_LIMIT; |
3ab224be HA |
1972 | |
1973 | sk->sk_forward_alloc += amt * SK_MEM_QUANTUM; | |
180d8cd9 | 1974 | |
e1aab161 | 1975 | allocated = sk_memory_allocated_add(sk, amt, &parent_status); |
3ab224be HA |
1976 | |
1977 | /* Under limit. */ | |
e1aab161 GC |
1978 | if (parent_status == UNDER_LIMIT && |
1979 | allocated <= sk_prot_mem_limits(sk, 0)) { | |
180d8cd9 | 1980 | sk_leave_memory_pressure(sk); |
3ab224be HA |
1981 | return 1; |
1982 | } | |
1983 | ||
e1aab161 GC |
1984 | /* Under pressure. (we or our parents) */ |
1985 | if ((parent_status > SOFT_LIMIT) || | |
1986 | allocated > sk_prot_mem_limits(sk, 1)) | |
180d8cd9 | 1987 | sk_enter_memory_pressure(sk); |
3ab224be | 1988 | |
e1aab161 GC |
1989 | /* Over hard limit (we or our parents) */ |
1990 | if ((parent_status == OVER_LIMIT) || | |
1991 | (allocated > sk_prot_mem_limits(sk, 2))) | |
3ab224be HA |
1992 | goto suppress_allocation; |
1993 | ||
1994 | /* guarantee minimum buffer size under pressure */ | |
1995 | if (kind == SK_MEM_RECV) { | |
1996 | if (atomic_read(&sk->sk_rmem_alloc) < prot->sysctl_rmem[0]) | |
1997 | return 1; | |
180d8cd9 | 1998 | |
3ab224be HA |
1999 | } else { /* SK_MEM_SEND */ |
2000 | if (sk->sk_type == SOCK_STREAM) { | |
2001 | if (sk->sk_wmem_queued < prot->sysctl_wmem[0]) | |
2002 | return 1; | |
2003 | } else if (atomic_read(&sk->sk_wmem_alloc) < | |
2004 | prot->sysctl_wmem[0]) | |
2005 | return 1; | |
2006 | } | |
2007 | ||
180d8cd9 | 2008 | if (sk_has_memory_pressure(sk)) { |
1748376b ED |
2009 | int alloc; |
2010 | ||
180d8cd9 | 2011 | if (!sk_under_memory_pressure(sk)) |
1748376b | 2012 | return 1; |
180d8cd9 GC |
2013 | alloc = sk_sockets_allocated_read_positive(sk); |
2014 | if (sk_prot_mem_limits(sk, 2) > alloc * | |
3ab224be HA |
2015 | sk_mem_pages(sk->sk_wmem_queued + |
2016 | atomic_read(&sk->sk_rmem_alloc) + | |
2017 | sk->sk_forward_alloc)) | |
2018 | return 1; | |
2019 | } | |
2020 | ||
2021 | suppress_allocation: | |
2022 | ||
2023 | if (kind == SK_MEM_SEND && sk->sk_type == SOCK_STREAM) { | |
2024 | sk_stream_moderate_sndbuf(sk); | |
2025 | ||
2026 | /* Fail only if socket is _under_ its sndbuf. | |
2027 | * In this case we cannot block, so that we have to fail. | |
2028 | */ | |
2029 | if (sk->sk_wmem_queued + size >= sk->sk_sndbuf) | |
2030 | return 1; | |
2031 | } | |
2032 | ||
3847ce32 SM |
2033 | trace_sock_exceed_buf_limit(sk, prot, allocated); |
2034 | ||
3ab224be HA |
2035 | /* Alas. Undo changes. */ |
2036 | sk->sk_forward_alloc -= amt * SK_MEM_QUANTUM; | |
180d8cd9 | 2037 | |
0e90b31f | 2038 | sk_memory_allocated_sub(sk, amt); |
180d8cd9 | 2039 | |
3ab224be HA |
2040 | return 0; |
2041 | } | |
3ab224be HA |
2042 | EXPORT_SYMBOL(__sk_mem_schedule); |
2043 | ||
2044 | /** | |
2045 | * __sk_reclaim - reclaim memory_allocated | |
2046 | * @sk: socket | |
2047 | */ | |
2048 | void __sk_mem_reclaim(struct sock *sk) | |
2049 | { | |
180d8cd9 | 2050 | sk_memory_allocated_sub(sk, |
0e90b31f | 2051 | sk->sk_forward_alloc >> SK_MEM_QUANTUM_SHIFT); |
3ab224be HA |
2052 | sk->sk_forward_alloc &= SK_MEM_QUANTUM - 1; |
2053 | ||
180d8cd9 GC |
2054 | if (sk_under_memory_pressure(sk) && |
2055 | (sk_memory_allocated(sk) < sk_prot_mem_limits(sk, 0))) | |
2056 | sk_leave_memory_pressure(sk); | |
3ab224be | 2057 | } |
3ab224be HA |
2058 | EXPORT_SYMBOL(__sk_mem_reclaim); |
2059 | ||
2060 | ||
1da177e4 LT |
2061 | /* |
2062 | * Set of default routines for initialising struct proto_ops when | |
2063 | * the protocol does not support a particular function. In certain | |
2064 | * cases where it makes no sense for a protocol to have a "do nothing" | |
2065 | * function, some default processing is provided. | |
2066 | */ | |
2067 | ||
2068 | int sock_no_bind(struct socket *sock, struct sockaddr *saddr, int len) | |
2069 | { | |
2070 | return -EOPNOTSUPP; | |
2071 | } | |
2a91525c | 2072 | EXPORT_SYMBOL(sock_no_bind); |
1da177e4 | 2073 | |
4ec93edb | 2074 | int sock_no_connect(struct socket *sock, struct sockaddr *saddr, |
1da177e4 LT |
2075 | int len, int flags) |
2076 | { | |
2077 | return -EOPNOTSUPP; | |
2078 | } | |
2a91525c | 2079 | EXPORT_SYMBOL(sock_no_connect); |
1da177e4 LT |
2080 | |
2081 | int sock_no_socketpair(struct socket *sock1, struct socket *sock2) | |
2082 | { | |
2083 | return -EOPNOTSUPP; | |
2084 | } | |
2a91525c | 2085 | EXPORT_SYMBOL(sock_no_socketpair); |
1da177e4 LT |
2086 | |
2087 | int sock_no_accept(struct socket *sock, struct socket *newsock, int flags) | |
2088 | { | |
2089 | return -EOPNOTSUPP; | |
2090 | } | |
2a91525c | 2091 | EXPORT_SYMBOL(sock_no_accept); |
1da177e4 | 2092 | |
4ec93edb | 2093 | int sock_no_getname(struct socket *sock, struct sockaddr *saddr, |
1da177e4 LT |
2094 | int *len, int peer) |
2095 | { | |
2096 | return -EOPNOTSUPP; | |
2097 | } | |
2a91525c | 2098 | EXPORT_SYMBOL(sock_no_getname); |
1da177e4 | 2099 | |
2a91525c | 2100 | unsigned int sock_no_poll(struct file *file, struct socket *sock, poll_table *pt) |
1da177e4 LT |
2101 | { |
2102 | return 0; | |
2103 | } | |
2a91525c | 2104 | EXPORT_SYMBOL(sock_no_poll); |
1da177e4 LT |
2105 | |
2106 | int sock_no_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg) | |
2107 | { | |
2108 | return -EOPNOTSUPP; | |
2109 | } | |
2a91525c | 2110 | EXPORT_SYMBOL(sock_no_ioctl); |
1da177e4 LT |
2111 | |
2112 | int sock_no_listen(struct socket *sock, int backlog) | |
2113 | { | |
2114 | return -EOPNOTSUPP; | |
2115 | } | |
2a91525c | 2116 | EXPORT_SYMBOL(sock_no_listen); |
1da177e4 LT |
2117 | |
2118 | int sock_no_shutdown(struct socket *sock, int how) | |
2119 | { | |
2120 | return -EOPNOTSUPP; | |
2121 | } | |
2a91525c | 2122 | EXPORT_SYMBOL(sock_no_shutdown); |
1da177e4 LT |
2123 | |
2124 | int sock_no_setsockopt(struct socket *sock, int level, int optname, | |
b7058842 | 2125 | char __user *optval, unsigned int optlen) |
1da177e4 LT |
2126 | { |
2127 | return -EOPNOTSUPP; | |
2128 | } | |
2a91525c | 2129 | EXPORT_SYMBOL(sock_no_setsockopt); |
1da177e4 LT |
2130 | |
2131 | int sock_no_getsockopt(struct socket *sock, int level, int optname, | |
2132 | char __user *optval, int __user *optlen) | |
2133 | { | |
2134 | return -EOPNOTSUPP; | |
2135 | } | |
2a91525c | 2136 | EXPORT_SYMBOL(sock_no_getsockopt); |
1da177e4 LT |
2137 | |
2138 | int sock_no_sendmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *m, | |
2139 | size_t len) | |
2140 | { | |
2141 | return -EOPNOTSUPP; | |
2142 | } | |
2a91525c | 2143 | EXPORT_SYMBOL(sock_no_sendmsg); |
1da177e4 LT |
2144 | |
2145 | int sock_no_recvmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *m, | |
2146 | size_t len, int flags) | |
2147 | { | |
2148 | return -EOPNOTSUPP; | |
2149 | } | |
2a91525c | 2150 | EXPORT_SYMBOL(sock_no_recvmsg); |
1da177e4 LT |
2151 | |
2152 | int sock_no_mmap(struct file *file, struct socket *sock, struct vm_area_struct *vma) | |
2153 | { | |
2154 | /* Mirror missing mmap method error code */ | |
2155 | return -ENODEV; | |
2156 | } | |
2a91525c | 2157 | EXPORT_SYMBOL(sock_no_mmap); |
1da177e4 LT |
2158 | |
2159 | ssize_t sock_no_sendpage(struct socket *sock, struct page *page, int offset, size_t size, int flags) | |
2160 | { | |
2161 | ssize_t res; | |
2162 | struct msghdr msg = {.msg_flags = flags}; | |
2163 | struct kvec iov; | |
2164 | char *kaddr = kmap(page); | |
2165 | iov.iov_base = kaddr + offset; | |
2166 | iov.iov_len = size; | |
2167 | res = kernel_sendmsg(sock, &msg, &iov, 1, size); | |
2168 | kunmap(page); | |
2169 | return res; | |
2170 | } | |
2a91525c | 2171 | EXPORT_SYMBOL(sock_no_sendpage); |
1da177e4 LT |
2172 | |
2173 | /* | |
2174 | * Default Socket Callbacks | |
2175 | */ | |
2176 | ||
2177 | static void sock_def_wakeup(struct sock *sk) | |
2178 | { | |
43815482 ED |
2179 | struct socket_wq *wq; |
2180 | ||
2181 | rcu_read_lock(); | |
2182 | wq = rcu_dereference(sk->sk_wq); | |
2183 | if (wq_has_sleeper(wq)) | |
2184 | wake_up_interruptible_all(&wq->wait); | |
2185 | rcu_read_unlock(); | |
1da177e4 LT |
2186 | } |
2187 | ||
2188 | static void sock_def_error_report(struct sock *sk) | |
2189 | { | |
43815482 ED |
2190 | struct socket_wq *wq; |
2191 | ||
2192 | rcu_read_lock(); | |
2193 | wq = rcu_dereference(sk->sk_wq); | |
2194 | if (wq_has_sleeper(wq)) | |
2195 | wake_up_interruptible_poll(&wq->wait, POLLERR); | |
8d8ad9d7 | 2196 | sk_wake_async(sk, SOCK_WAKE_IO, POLL_ERR); |
43815482 | 2197 | rcu_read_unlock(); |
1da177e4 LT |
2198 | } |
2199 | ||
2200 | static void sock_def_readable(struct sock *sk, int len) | |
2201 | { | |
43815482 ED |
2202 | struct socket_wq *wq; |
2203 | ||
2204 | rcu_read_lock(); | |
2205 | wq = rcu_dereference(sk->sk_wq); | |
2206 | if (wq_has_sleeper(wq)) | |
2c6607c6 | 2207 | wake_up_interruptible_sync_poll(&wq->wait, POLLIN | POLLPRI | |
37e5540b | 2208 | POLLRDNORM | POLLRDBAND); |
8d8ad9d7 | 2209 | sk_wake_async(sk, SOCK_WAKE_WAITD, POLL_IN); |
43815482 | 2210 | rcu_read_unlock(); |
1da177e4 LT |
2211 | } |
2212 | ||
2213 | static void sock_def_write_space(struct sock *sk) | |
2214 | { | |
43815482 ED |
2215 | struct socket_wq *wq; |
2216 | ||
2217 | rcu_read_lock(); | |
1da177e4 LT |
2218 | |
2219 | /* Do not wake up a writer until he can make "significant" | |
2220 | * progress. --DaveM | |
2221 | */ | |
e71a4783 | 2222 | if ((atomic_read(&sk->sk_wmem_alloc) << 1) <= sk->sk_sndbuf) { |
43815482 ED |
2223 | wq = rcu_dereference(sk->sk_wq); |
2224 | if (wq_has_sleeper(wq)) | |
2225 | wake_up_interruptible_sync_poll(&wq->wait, POLLOUT | | |
37e5540b | 2226 | POLLWRNORM | POLLWRBAND); |
1da177e4 LT |
2227 | |
2228 | /* Should agree with poll, otherwise some programs break */ | |
2229 | if (sock_writeable(sk)) | |
8d8ad9d7 | 2230 | sk_wake_async(sk, SOCK_WAKE_SPACE, POLL_OUT); |
1da177e4 LT |
2231 | } |
2232 | ||
43815482 | 2233 | rcu_read_unlock(); |
1da177e4 LT |
2234 | } |
2235 | ||
2236 | static void sock_def_destruct(struct sock *sk) | |
2237 | { | |
a51482bd | 2238 | kfree(sk->sk_protinfo); |
1da177e4 LT |
2239 | } |
2240 | ||
2241 | void sk_send_sigurg(struct sock *sk) | |
2242 | { | |
2243 | if (sk->sk_socket && sk->sk_socket->file) | |
2244 | if (send_sigurg(&sk->sk_socket->file->f_owner)) | |
8d8ad9d7 | 2245 | sk_wake_async(sk, SOCK_WAKE_URG, POLL_PRI); |
1da177e4 | 2246 | } |
2a91525c | 2247 | EXPORT_SYMBOL(sk_send_sigurg); |
1da177e4 LT |
2248 | |
2249 | void sk_reset_timer(struct sock *sk, struct timer_list* timer, | |
2250 | unsigned long expires) | |
2251 | { | |
2252 | if (!mod_timer(timer, expires)) | |
2253 | sock_hold(sk); | |
2254 | } | |
1da177e4 LT |
2255 | EXPORT_SYMBOL(sk_reset_timer); |
2256 | ||
2257 | void sk_stop_timer(struct sock *sk, struct timer_list* timer) | |
2258 | { | |
25cc4ae9 | 2259 | if (del_timer(timer)) |
1da177e4 LT |
2260 | __sock_put(sk); |
2261 | } | |
1da177e4 LT |
2262 | EXPORT_SYMBOL(sk_stop_timer); |
2263 | ||
2264 | void sock_init_data(struct socket *sock, struct sock *sk) | |
2265 | { | |
2266 | skb_queue_head_init(&sk->sk_receive_queue); | |
2267 | skb_queue_head_init(&sk->sk_write_queue); | |
2268 | skb_queue_head_init(&sk->sk_error_queue); | |
97fc2f08 CL |
2269 | #ifdef CONFIG_NET_DMA |
2270 | skb_queue_head_init(&sk->sk_async_wait_queue); | |
2271 | #endif | |
1da177e4 LT |
2272 | |
2273 | sk->sk_send_head = NULL; | |
2274 | ||
2275 | init_timer(&sk->sk_timer); | |
4ec93edb | 2276 | |
1da177e4 LT |
2277 | sk->sk_allocation = GFP_KERNEL; |
2278 | sk->sk_rcvbuf = sysctl_rmem_default; | |
2279 | sk->sk_sndbuf = sysctl_wmem_default; | |
2280 | sk->sk_state = TCP_CLOSE; | |
972692e0 | 2281 | sk_set_socket(sk, sock); |
1da177e4 LT |
2282 | |
2283 | sock_set_flag(sk, SOCK_ZAPPED); | |
2284 | ||
e71a4783 | 2285 | if (sock) { |
1da177e4 | 2286 | sk->sk_type = sock->type; |
43815482 | 2287 | sk->sk_wq = sock->wq; |
1da177e4 LT |
2288 | sock->sk = sk; |
2289 | } else | |
43815482 | 2290 | sk->sk_wq = NULL; |
1da177e4 | 2291 | |
b6c6712a | 2292 | spin_lock_init(&sk->sk_dst_lock); |
1da177e4 | 2293 | rwlock_init(&sk->sk_callback_lock); |
443aef0e PZ |
2294 | lockdep_set_class_and_name(&sk->sk_callback_lock, |
2295 | af_callback_keys + sk->sk_family, | |
2296 | af_family_clock_key_strings[sk->sk_family]); | |
1da177e4 LT |
2297 | |
2298 | sk->sk_state_change = sock_def_wakeup; | |
2299 | sk->sk_data_ready = sock_def_readable; | |
2300 | sk->sk_write_space = sock_def_write_space; | |
2301 | sk->sk_error_report = sock_def_error_report; | |
2302 | sk->sk_destruct = sock_def_destruct; | |
2303 | ||
5640f768 ED |
2304 | sk->sk_frag.page = NULL; |
2305 | sk->sk_frag.offset = 0; | |
ef64a54f | 2306 | sk->sk_peek_off = -1; |
1da177e4 | 2307 | |
109f6e39 EB |
2308 | sk->sk_peer_pid = NULL; |
2309 | sk->sk_peer_cred = NULL; | |
1da177e4 LT |
2310 | sk->sk_write_pending = 0; |
2311 | sk->sk_rcvlowat = 1; | |
2312 | sk->sk_rcvtimeo = MAX_SCHEDULE_TIMEOUT; | |
2313 | sk->sk_sndtimeo = MAX_SCHEDULE_TIMEOUT; | |
2314 | ||
f37f0afb | 2315 | sk->sk_stamp = ktime_set(-1L, 0); |
1da177e4 | 2316 | |
e0d1095a | 2317 | #ifdef CONFIG_NET_RX_BUSY_POLL |
06021292 | 2318 | sk->sk_napi_id = 0; |
64b0dc51 | 2319 | sk->sk_ll_usec = sysctl_net_busy_read; |
06021292 ET |
2320 | #endif |
2321 | ||
4dc6dc71 ED |
2322 | /* |
2323 | * Before updating sk_refcnt, we must commit prior changes to memory | |
2324 | * (Documentation/RCU/rculist_nulls.txt for details) | |
2325 | */ | |
2326 | smp_wmb(); | |
1da177e4 | 2327 | atomic_set(&sk->sk_refcnt, 1); |
33c732c3 | 2328 | atomic_set(&sk->sk_drops, 0); |
1da177e4 | 2329 | } |
2a91525c | 2330 | EXPORT_SYMBOL(sock_init_data); |
1da177e4 | 2331 | |
b5606c2d | 2332 | void lock_sock_nested(struct sock *sk, int subclass) |
1da177e4 LT |
2333 | { |
2334 | might_sleep(); | |
a5b5bb9a | 2335 | spin_lock_bh(&sk->sk_lock.slock); |
d2e9117c | 2336 | if (sk->sk_lock.owned) |
1da177e4 | 2337 | __lock_sock(sk); |
d2e9117c | 2338 | sk->sk_lock.owned = 1; |
a5b5bb9a IM |
2339 | spin_unlock(&sk->sk_lock.slock); |
2340 | /* | |
2341 | * The sk_lock has mutex_lock() semantics here: | |
2342 | */ | |
fcc70d5f | 2343 | mutex_acquire(&sk->sk_lock.dep_map, subclass, 0, _RET_IP_); |
a5b5bb9a | 2344 | local_bh_enable(); |
1da177e4 | 2345 | } |
fcc70d5f | 2346 | EXPORT_SYMBOL(lock_sock_nested); |
1da177e4 | 2347 | |
b5606c2d | 2348 | void release_sock(struct sock *sk) |
1da177e4 | 2349 | { |
a5b5bb9a IM |
2350 | /* |
2351 | * The sk_lock has mutex_unlock() semantics: | |
2352 | */ | |
2353 | mutex_release(&sk->sk_lock.dep_map, 1, _RET_IP_); | |
2354 | ||
2355 | spin_lock_bh(&sk->sk_lock.slock); | |
1da177e4 LT |
2356 | if (sk->sk_backlog.tail) |
2357 | __release_sock(sk); | |
46d3ceab ED |
2358 | |
2359 | if (sk->sk_prot->release_cb) | |
2360 | sk->sk_prot->release_cb(sk); | |
2361 | ||
d2e9117c | 2362 | sk->sk_lock.owned = 0; |
a5b5bb9a IM |
2363 | if (waitqueue_active(&sk->sk_lock.wq)) |
2364 | wake_up(&sk->sk_lock.wq); | |
2365 | spin_unlock_bh(&sk->sk_lock.slock); | |
1da177e4 LT |
2366 | } |
2367 | EXPORT_SYMBOL(release_sock); | |
2368 | ||
8a74ad60 ED |
2369 | /** |
2370 | * lock_sock_fast - fast version of lock_sock | |
2371 | * @sk: socket | |
2372 | * | |
2373 | * This version should be used for very small section, where process wont block | |
2374 | * return false if fast path is taken | |
2375 | * sk_lock.slock locked, owned = 0, BH disabled | |
2376 | * return true if slow path is taken | |
2377 | * sk_lock.slock unlocked, owned = 1, BH enabled | |
2378 | */ | |
2379 | bool lock_sock_fast(struct sock *sk) | |
2380 | { | |
2381 | might_sleep(); | |
2382 | spin_lock_bh(&sk->sk_lock.slock); | |
2383 | ||
2384 | if (!sk->sk_lock.owned) | |
2385 | /* | |
2386 | * Note : We must disable BH | |
2387 | */ | |
2388 | return false; | |
2389 | ||
2390 | __lock_sock(sk); | |
2391 | sk->sk_lock.owned = 1; | |
2392 | spin_unlock(&sk->sk_lock.slock); | |
2393 | /* | |
2394 | * The sk_lock has mutex_lock() semantics here: | |
2395 | */ | |
2396 | mutex_acquire(&sk->sk_lock.dep_map, 0, 0, _RET_IP_); | |
2397 | local_bh_enable(); | |
2398 | return true; | |
2399 | } | |
2400 | EXPORT_SYMBOL(lock_sock_fast); | |
2401 | ||
1da177e4 | 2402 | int sock_get_timestamp(struct sock *sk, struct timeval __user *userstamp) |
4ec93edb | 2403 | { |
b7aa0bf7 | 2404 | struct timeval tv; |
1da177e4 | 2405 | if (!sock_flag(sk, SOCK_TIMESTAMP)) |
20d49473 | 2406 | sock_enable_timestamp(sk, SOCK_TIMESTAMP); |
b7aa0bf7 ED |
2407 | tv = ktime_to_timeval(sk->sk_stamp); |
2408 | if (tv.tv_sec == -1) | |
1da177e4 | 2409 | return -ENOENT; |
b7aa0bf7 ED |
2410 | if (tv.tv_sec == 0) { |
2411 | sk->sk_stamp = ktime_get_real(); | |
2412 | tv = ktime_to_timeval(sk->sk_stamp); | |
2413 | } | |
2414 | return copy_to_user(userstamp, &tv, sizeof(tv)) ? -EFAULT : 0; | |
4ec93edb | 2415 | } |
1da177e4 LT |
2416 | EXPORT_SYMBOL(sock_get_timestamp); |
2417 | ||
ae40eb1e ED |
2418 | int sock_get_timestampns(struct sock *sk, struct timespec __user *userstamp) |
2419 | { | |
2420 | struct timespec ts; | |
2421 | if (!sock_flag(sk, SOCK_TIMESTAMP)) | |
20d49473 | 2422 | sock_enable_timestamp(sk, SOCK_TIMESTAMP); |
ae40eb1e ED |
2423 | ts = ktime_to_timespec(sk->sk_stamp); |
2424 | if (ts.tv_sec == -1) | |
2425 | return -ENOENT; | |
2426 | if (ts.tv_sec == 0) { | |
2427 | sk->sk_stamp = ktime_get_real(); | |
2428 | ts = ktime_to_timespec(sk->sk_stamp); | |
2429 | } | |
2430 | return copy_to_user(userstamp, &ts, sizeof(ts)) ? -EFAULT : 0; | |
2431 | } | |
2432 | EXPORT_SYMBOL(sock_get_timestampns); | |
2433 | ||
20d49473 | 2434 | void sock_enable_timestamp(struct sock *sk, int flag) |
4ec93edb | 2435 | { |
20d49473 | 2436 | if (!sock_flag(sk, flag)) { |
08e29af3 ED |
2437 | unsigned long previous_flags = sk->sk_flags; |
2438 | ||
20d49473 PO |
2439 | sock_set_flag(sk, flag); |
2440 | /* | |
2441 | * we just set one of the two flags which require net | |
2442 | * time stamping, but time stamping might have been on | |
2443 | * already because of the other one | |
2444 | */ | |
08e29af3 | 2445 | if (!(previous_flags & SK_FLAGS_TIMESTAMP)) |
20d49473 | 2446 | net_enable_timestamp(); |
1da177e4 LT |
2447 | } |
2448 | } | |
1da177e4 | 2449 | |
cb820f8e RC |
2450 | int sock_recv_errqueue(struct sock *sk, struct msghdr *msg, int len, |
2451 | int level, int type) | |
2452 | { | |
2453 | struct sock_exterr_skb *serr; | |
2454 | struct sk_buff *skb, *skb2; | |
2455 | int copied, err; | |
2456 | ||
2457 | err = -EAGAIN; | |
2458 | skb = skb_dequeue(&sk->sk_error_queue); | |
2459 | if (skb == NULL) | |
2460 | goto out; | |
2461 | ||
2462 | copied = skb->len; | |
2463 | if (copied > len) { | |
2464 | msg->msg_flags |= MSG_TRUNC; | |
2465 | copied = len; | |
2466 | } | |
2467 | err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied); | |
2468 | if (err) | |
2469 | goto out_free_skb; | |
2470 | ||
2471 | sock_recv_timestamp(msg, sk, skb); | |
2472 | ||
2473 | serr = SKB_EXT_ERR(skb); | |
2474 | put_cmsg(msg, level, type, sizeof(serr->ee), &serr->ee); | |
2475 | ||
2476 | msg->msg_flags |= MSG_ERRQUEUE; | |
2477 | err = copied; | |
2478 | ||
2479 | /* Reset and regenerate socket error */ | |
2480 | spin_lock_bh(&sk->sk_error_queue.lock); | |
2481 | sk->sk_err = 0; | |
2482 | if ((skb2 = skb_peek(&sk->sk_error_queue)) != NULL) { | |
2483 | sk->sk_err = SKB_EXT_ERR(skb2)->ee.ee_errno; | |
2484 | spin_unlock_bh(&sk->sk_error_queue.lock); | |
2485 | sk->sk_error_report(sk); | |
2486 | } else | |
2487 | spin_unlock_bh(&sk->sk_error_queue.lock); | |
2488 | ||
2489 | out_free_skb: | |
2490 | kfree_skb(skb); | |
2491 | out: | |
2492 | return err; | |
2493 | } | |
2494 | EXPORT_SYMBOL(sock_recv_errqueue); | |
2495 | ||
1da177e4 LT |
2496 | /* |
2497 | * Get a socket option on an socket. | |
2498 | * | |
2499 | * FIX: POSIX 1003.1g is very ambiguous here. It states that | |
2500 | * asynchronous errors should be reported by getsockopt. We assume | |
2501 | * this means if you specify SO_ERROR (otherwise whats the point of it). | |
2502 | */ | |
2503 | int sock_common_getsockopt(struct socket *sock, int level, int optname, | |
2504 | char __user *optval, int __user *optlen) | |
2505 | { | |
2506 | struct sock *sk = sock->sk; | |
2507 | ||
2508 | return sk->sk_prot->getsockopt(sk, level, optname, optval, optlen); | |
2509 | } | |
1da177e4 LT |
2510 | EXPORT_SYMBOL(sock_common_getsockopt); |
2511 | ||
3fdadf7d | 2512 | #ifdef CONFIG_COMPAT |
543d9cfe ACM |
2513 | int compat_sock_common_getsockopt(struct socket *sock, int level, int optname, |
2514 | char __user *optval, int __user *optlen) | |
3fdadf7d DM |
2515 | { |
2516 | struct sock *sk = sock->sk; | |
2517 | ||
1e51f951 | 2518 | if (sk->sk_prot->compat_getsockopt != NULL) |
543d9cfe ACM |
2519 | return sk->sk_prot->compat_getsockopt(sk, level, optname, |
2520 | optval, optlen); | |
3fdadf7d DM |
2521 | return sk->sk_prot->getsockopt(sk, level, optname, optval, optlen); |
2522 | } | |
2523 | EXPORT_SYMBOL(compat_sock_common_getsockopt); | |
2524 | #endif | |
2525 | ||
1da177e4 LT |
2526 | int sock_common_recvmsg(struct kiocb *iocb, struct socket *sock, |
2527 | struct msghdr *msg, size_t size, int flags) | |
2528 | { | |
2529 | struct sock *sk = sock->sk; | |
2530 | int addr_len = 0; | |
2531 | int err; | |
2532 | ||
2533 | err = sk->sk_prot->recvmsg(iocb, sk, msg, size, flags & MSG_DONTWAIT, | |
2534 | flags & ~MSG_DONTWAIT, &addr_len); | |
2535 | if (err >= 0) | |
2536 | msg->msg_namelen = addr_len; | |
2537 | return err; | |
2538 | } | |
1da177e4 LT |
2539 | EXPORT_SYMBOL(sock_common_recvmsg); |
2540 | ||
2541 | /* | |
2542 | * Set socket options on an inet socket. | |
2543 | */ | |
2544 | int sock_common_setsockopt(struct socket *sock, int level, int optname, | |
b7058842 | 2545 | char __user *optval, unsigned int optlen) |
1da177e4 LT |
2546 | { |
2547 | struct sock *sk = sock->sk; | |
2548 | ||
2549 | return sk->sk_prot->setsockopt(sk, level, optname, optval, optlen); | |
2550 | } | |
1da177e4 LT |
2551 | EXPORT_SYMBOL(sock_common_setsockopt); |
2552 | ||
3fdadf7d | 2553 | #ifdef CONFIG_COMPAT |
543d9cfe | 2554 | int compat_sock_common_setsockopt(struct socket *sock, int level, int optname, |
b7058842 | 2555 | char __user *optval, unsigned int optlen) |
3fdadf7d DM |
2556 | { |
2557 | struct sock *sk = sock->sk; | |
2558 | ||
543d9cfe ACM |
2559 | if (sk->sk_prot->compat_setsockopt != NULL) |
2560 | return sk->sk_prot->compat_setsockopt(sk, level, optname, | |
2561 | optval, optlen); | |
3fdadf7d DM |
2562 | return sk->sk_prot->setsockopt(sk, level, optname, optval, optlen); |
2563 | } | |
2564 | EXPORT_SYMBOL(compat_sock_common_setsockopt); | |
2565 | #endif | |
2566 | ||
1da177e4 LT |
2567 | void sk_common_release(struct sock *sk) |
2568 | { | |
2569 | if (sk->sk_prot->destroy) | |
2570 | sk->sk_prot->destroy(sk); | |
2571 | ||
2572 | /* | |
2573 | * Observation: when sock_common_release is called, processes have | |
2574 | * no access to socket. But net still has. | |
2575 | * Step one, detach it from networking: | |
2576 | * | |
2577 | * A. Remove from hash tables. | |
2578 | */ | |
2579 | ||
2580 | sk->sk_prot->unhash(sk); | |
2581 | ||
2582 | /* | |
2583 | * In this point socket cannot receive new packets, but it is possible | |
2584 | * that some packets are in flight because some CPU runs receiver and | |
2585 | * did hash table lookup before we unhashed socket. They will achieve | |
2586 | * receive queue and will be purged by socket destructor. | |
2587 | * | |
2588 | * Also we still have packets pending on receive queue and probably, | |
2589 | * our own packets waiting in device queues. sock_destroy will drain | |
2590 | * receive queue, but transmitted packets will delay socket destruction | |
2591 | * until the last reference will be released. | |
2592 | */ | |
2593 | ||
2594 | sock_orphan(sk); | |
2595 | ||
2596 | xfrm_sk_free_policy(sk); | |
2597 | ||
e6848976 | 2598 | sk_refcnt_debug_release(sk); |
5640f768 ED |
2599 | |
2600 | if (sk->sk_frag.page) { | |
2601 | put_page(sk->sk_frag.page); | |
2602 | sk->sk_frag.page = NULL; | |
2603 | } | |
2604 | ||
1da177e4 LT |
2605 | sock_put(sk); |
2606 | } | |
1da177e4 LT |
2607 | EXPORT_SYMBOL(sk_common_release); |
2608 | ||
13ff3d6f PE |
2609 | #ifdef CONFIG_PROC_FS |
2610 | #define PROTO_INUSE_NR 64 /* should be enough for the first time */ | |
1338d466 PE |
2611 | struct prot_inuse { |
2612 | int val[PROTO_INUSE_NR]; | |
2613 | }; | |
13ff3d6f PE |
2614 | |
2615 | static DECLARE_BITMAP(proto_inuse_idx, PROTO_INUSE_NR); | |
70ee1159 PE |
2616 | |
2617 | #ifdef CONFIG_NET_NS | |
2618 | void sock_prot_inuse_add(struct net *net, struct proto *prot, int val) | |
2619 | { | |
d6d9ca0f | 2620 | __this_cpu_add(net->core.inuse->val[prot->inuse_idx], val); |
70ee1159 PE |
2621 | } |
2622 | EXPORT_SYMBOL_GPL(sock_prot_inuse_add); | |
2623 | ||
2624 | int sock_prot_inuse_get(struct net *net, struct proto *prot) | |
2625 | { | |
2626 | int cpu, idx = prot->inuse_idx; | |
2627 | int res = 0; | |
2628 | ||
2629 | for_each_possible_cpu(cpu) | |
2630 | res += per_cpu_ptr(net->core.inuse, cpu)->val[idx]; | |
2631 | ||
2632 | return res >= 0 ? res : 0; | |
2633 | } | |
2634 | EXPORT_SYMBOL_GPL(sock_prot_inuse_get); | |
2635 | ||
2c8c1e72 | 2636 | static int __net_init sock_inuse_init_net(struct net *net) |
70ee1159 PE |
2637 | { |
2638 | net->core.inuse = alloc_percpu(struct prot_inuse); | |
2639 | return net->core.inuse ? 0 : -ENOMEM; | |
2640 | } | |
2641 | ||
2c8c1e72 | 2642 | static void __net_exit sock_inuse_exit_net(struct net *net) |
70ee1159 PE |
2643 | { |
2644 | free_percpu(net->core.inuse); | |
2645 | } | |
2646 | ||
2647 | static struct pernet_operations net_inuse_ops = { | |
2648 | .init = sock_inuse_init_net, | |
2649 | .exit = sock_inuse_exit_net, | |
2650 | }; | |
2651 | ||
2652 | static __init int net_inuse_init(void) | |
2653 | { | |
2654 | if (register_pernet_subsys(&net_inuse_ops)) | |
2655 | panic("Cannot initialize net inuse counters"); | |
2656 | ||
2657 | return 0; | |
2658 | } | |
2659 | ||
2660 | core_initcall(net_inuse_init); | |
2661 | #else | |
1338d466 PE |
2662 | static DEFINE_PER_CPU(struct prot_inuse, prot_inuse); |
2663 | ||
c29a0bc4 | 2664 | void sock_prot_inuse_add(struct net *net, struct proto *prot, int val) |
1338d466 | 2665 | { |
d6d9ca0f | 2666 | __this_cpu_add(prot_inuse.val[prot->inuse_idx], val); |
1338d466 PE |
2667 | } |
2668 | EXPORT_SYMBOL_GPL(sock_prot_inuse_add); | |
2669 | ||
c29a0bc4 | 2670 | int sock_prot_inuse_get(struct net *net, struct proto *prot) |
1338d466 PE |
2671 | { |
2672 | int cpu, idx = prot->inuse_idx; | |
2673 | int res = 0; | |
2674 | ||
2675 | for_each_possible_cpu(cpu) | |
2676 | res += per_cpu(prot_inuse, cpu).val[idx]; | |
2677 | ||
2678 | return res >= 0 ? res : 0; | |
2679 | } | |
2680 | EXPORT_SYMBOL_GPL(sock_prot_inuse_get); | |
70ee1159 | 2681 | #endif |
13ff3d6f PE |
2682 | |
2683 | static void assign_proto_idx(struct proto *prot) | |
2684 | { | |
2685 | prot->inuse_idx = find_first_zero_bit(proto_inuse_idx, PROTO_INUSE_NR); | |
2686 | ||
2687 | if (unlikely(prot->inuse_idx == PROTO_INUSE_NR - 1)) { | |
e005d193 | 2688 | pr_err("PROTO_INUSE_NR exhausted\n"); |
13ff3d6f PE |
2689 | return; |
2690 | } | |
2691 | ||
2692 | set_bit(prot->inuse_idx, proto_inuse_idx); | |
2693 | } | |
2694 | ||
2695 | static void release_proto_idx(struct proto *prot) | |
2696 | { | |
2697 | if (prot->inuse_idx != PROTO_INUSE_NR - 1) | |
2698 | clear_bit(prot->inuse_idx, proto_inuse_idx); | |
2699 | } | |
2700 | #else | |
2701 | static inline void assign_proto_idx(struct proto *prot) | |
2702 | { | |
2703 | } | |
2704 | ||
2705 | static inline void release_proto_idx(struct proto *prot) | |
2706 | { | |
2707 | } | |
2708 | #endif | |
2709 | ||
b733c007 PE |
2710 | int proto_register(struct proto *prot, int alloc_slab) |
2711 | { | |
1da177e4 LT |
2712 | if (alloc_slab) { |
2713 | prot->slab = kmem_cache_create(prot->name, prot->obj_size, 0, | |
271b72c7 ED |
2714 | SLAB_HWCACHE_ALIGN | prot->slab_flags, |
2715 | NULL); | |
1da177e4 LT |
2716 | |
2717 | if (prot->slab == NULL) { | |
e005d193 JP |
2718 | pr_crit("%s: Can't create sock SLAB cache!\n", |
2719 | prot->name); | |
60e7663d | 2720 | goto out; |
1da177e4 | 2721 | } |
2e6599cb ACM |
2722 | |
2723 | if (prot->rsk_prot != NULL) { | |
faf23422 | 2724 | prot->rsk_prot->slab_name = kasprintf(GFP_KERNEL, "request_sock_%s", prot->name); |
7e56b5d6 | 2725 | if (prot->rsk_prot->slab_name == NULL) |
2e6599cb ACM |
2726 | goto out_free_sock_slab; |
2727 | ||
7e56b5d6 | 2728 | prot->rsk_prot->slab = kmem_cache_create(prot->rsk_prot->slab_name, |
2e6599cb | 2729 | prot->rsk_prot->obj_size, 0, |
20c2df83 | 2730 | SLAB_HWCACHE_ALIGN, NULL); |
2e6599cb ACM |
2731 | |
2732 | if (prot->rsk_prot->slab == NULL) { | |
e005d193 JP |
2733 | pr_crit("%s: Can't create request sock SLAB cache!\n", |
2734 | prot->name); | |
2e6599cb ACM |
2735 | goto out_free_request_sock_slab_name; |
2736 | } | |
2737 | } | |
8feaf0c0 | 2738 | |
6d6ee43e | 2739 | if (prot->twsk_prot != NULL) { |
faf23422 | 2740 | prot->twsk_prot->twsk_slab_name = kasprintf(GFP_KERNEL, "tw_sock_%s", prot->name); |
8feaf0c0 | 2741 | |
7e56b5d6 | 2742 | if (prot->twsk_prot->twsk_slab_name == NULL) |
8feaf0c0 ACM |
2743 | goto out_free_request_sock_slab; |
2744 | ||
6d6ee43e | 2745 | prot->twsk_prot->twsk_slab = |
7e56b5d6 | 2746 | kmem_cache_create(prot->twsk_prot->twsk_slab_name, |
6d6ee43e | 2747 | prot->twsk_prot->twsk_obj_size, |
3ab5aee7 ED |
2748 | 0, |
2749 | SLAB_HWCACHE_ALIGN | | |
2750 | prot->slab_flags, | |
20c2df83 | 2751 | NULL); |
6d6ee43e | 2752 | if (prot->twsk_prot->twsk_slab == NULL) |
8feaf0c0 ACM |
2753 | goto out_free_timewait_sock_slab_name; |
2754 | } | |
1da177e4 LT |
2755 | } |
2756 | ||
36b77a52 | 2757 | mutex_lock(&proto_list_mutex); |
1da177e4 | 2758 | list_add(&prot->node, &proto_list); |
13ff3d6f | 2759 | assign_proto_idx(prot); |
36b77a52 | 2760 | mutex_unlock(&proto_list_mutex); |
b733c007 PE |
2761 | return 0; |
2762 | ||
8feaf0c0 | 2763 | out_free_timewait_sock_slab_name: |
7e56b5d6 | 2764 | kfree(prot->twsk_prot->twsk_slab_name); |
8feaf0c0 ACM |
2765 | out_free_request_sock_slab: |
2766 | if (prot->rsk_prot && prot->rsk_prot->slab) { | |
2767 | kmem_cache_destroy(prot->rsk_prot->slab); | |
2768 | prot->rsk_prot->slab = NULL; | |
2769 | } | |
2e6599cb | 2770 | out_free_request_sock_slab_name: |
72150e9b DC |
2771 | if (prot->rsk_prot) |
2772 | kfree(prot->rsk_prot->slab_name); | |
2e6599cb ACM |
2773 | out_free_sock_slab: |
2774 | kmem_cache_destroy(prot->slab); | |
2775 | prot->slab = NULL; | |
b733c007 PE |
2776 | out: |
2777 | return -ENOBUFS; | |
1da177e4 | 2778 | } |
1da177e4 LT |
2779 | EXPORT_SYMBOL(proto_register); |
2780 | ||
2781 | void proto_unregister(struct proto *prot) | |
2782 | { | |
36b77a52 | 2783 | mutex_lock(&proto_list_mutex); |
13ff3d6f | 2784 | release_proto_idx(prot); |
0a3f4358 | 2785 | list_del(&prot->node); |
36b77a52 | 2786 | mutex_unlock(&proto_list_mutex); |
1da177e4 LT |
2787 | |
2788 | if (prot->slab != NULL) { | |
2789 | kmem_cache_destroy(prot->slab); | |
2790 | prot->slab = NULL; | |
2791 | } | |
2792 | ||
2e6599cb | 2793 | if (prot->rsk_prot != NULL && prot->rsk_prot->slab != NULL) { |
2e6599cb | 2794 | kmem_cache_destroy(prot->rsk_prot->slab); |
7e56b5d6 | 2795 | kfree(prot->rsk_prot->slab_name); |
2e6599cb ACM |
2796 | prot->rsk_prot->slab = NULL; |
2797 | } | |
2798 | ||
6d6ee43e | 2799 | if (prot->twsk_prot != NULL && prot->twsk_prot->twsk_slab != NULL) { |
6d6ee43e | 2800 | kmem_cache_destroy(prot->twsk_prot->twsk_slab); |
7e56b5d6 | 2801 | kfree(prot->twsk_prot->twsk_slab_name); |
6d6ee43e | 2802 | prot->twsk_prot->twsk_slab = NULL; |
8feaf0c0 | 2803 | } |
1da177e4 | 2804 | } |
1da177e4 LT |
2805 | EXPORT_SYMBOL(proto_unregister); |
2806 | ||
2807 | #ifdef CONFIG_PROC_FS | |
1da177e4 | 2808 | static void *proto_seq_start(struct seq_file *seq, loff_t *pos) |
36b77a52 | 2809 | __acquires(proto_list_mutex) |
1da177e4 | 2810 | { |
36b77a52 | 2811 | mutex_lock(&proto_list_mutex); |
60f0438a | 2812 | return seq_list_start_head(&proto_list, *pos); |
1da177e4 LT |
2813 | } |
2814 | ||
2815 | static void *proto_seq_next(struct seq_file *seq, void *v, loff_t *pos) | |
2816 | { | |
60f0438a | 2817 | return seq_list_next(v, &proto_list, pos); |
1da177e4 LT |
2818 | } |
2819 | ||
2820 | static void proto_seq_stop(struct seq_file *seq, void *v) | |
36b77a52 | 2821 | __releases(proto_list_mutex) |
1da177e4 | 2822 | { |
36b77a52 | 2823 | mutex_unlock(&proto_list_mutex); |
1da177e4 LT |
2824 | } |
2825 | ||
2826 | static char proto_method_implemented(const void *method) | |
2827 | { | |
2828 | return method == NULL ? 'n' : 'y'; | |
2829 | } | |
180d8cd9 GC |
2830 | static long sock_prot_memory_allocated(struct proto *proto) |
2831 | { | |
cb75a36c | 2832 | return proto->memory_allocated != NULL ? proto_memory_allocated(proto) : -1L; |
180d8cd9 GC |
2833 | } |
2834 | ||
2835 | static char *sock_prot_memory_pressure(struct proto *proto) | |
2836 | { | |
2837 | return proto->memory_pressure != NULL ? | |
2838 | proto_memory_pressure(proto) ? "yes" : "no" : "NI"; | |
2839 | } | |
1da177e4 LT |
2840 | |
2841 | static void proto_seq_printf(struct seq_file *seq, struct proto *proto) | |
2842 | { | |
180d8cd9 | 2843 | |
8d987e5c | 2844 | seq_printf(seq, "%-9s %4u %6d %6ld %-3s %6u %-3s %-10s " |
1da177e4 LT |
2845 | "%2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c\n", |
2846 | proto->name, | |
2847 | proto->obj_size, | |
14e943db | 2848 | sock_prot_inuse_get(seq_file_net(seq), proto), |
180d8cd9 GC |
2849 | sock_prot_memory_allocated(proto), |
2850 | sock_prot_memory_pressure(proto), | |
1da177e4 LT |
2851 | proto->max_header, |
2852 | proto->slab == NULL ? "no" : "yes", | |
2853 | module_name(proto->owner), | |
2854 | proto_method_implemented(proto->close), | |
2855 | proto_method_implemented(proto->connect), | |
2856 | proto_method_implemented(proto->disconnect), | |
2857 | proto_method_implemented(proto->accept), | |
2858 | proto_method_implemented(proto->ioctl), | |
2859 | proto_method_implemented(proto->init), | |
2860 | proto_method_implemented(proto->destroy), | |
2861 | proto_method_implemented(proto->shutdown), | |
2862 | proto_method_implemented(proto->setsockopt), | |
2863 | proto_method_implemented(proto->getsockopt), | |
2864 | proto_method_implemented(proto->sendmsg), | |
2865 | proto_method_implemented(proto->recvmsg), | |
2866 | proto_method_implemented(proto->sendpage), | |
2867 | proto_method_implemented(proto->bind), | |
2868 | proto_method_implemented(proto->backlog_rcv), | |
2869 | proto_method_implemented(proto->hash), | |
2870 | proto_method_implemented(proto->unhash), | |
2871 | proto_method_implemented(proto->get_port), | |
2872 | proto_method_implemented(proto->enter_memory_pressure)); | |
2873 | } | |
2874 | ||
2875 | static int proto_seq_show(struct seq_file *seq, void *v) | |
2876 | { | |
60f0438a | 2877 | if (v == &proto_list) |
1da177e4 LT |
2878 | seq_printf(seq, "%-9s %-4s %-8s %-6s %-5s %-7s %-4s %-10s %s", |
2879 | "protocol", | |
2880 | "size", | |
2881 | "sockets", | |
2882 | "memory", | |
2883 | "press", | |
2884 | "maxhdr", | |
2885 | "slab", | |
2886 | "module", | |
2887 | "cl co di ac io in de sh ss gs se re sp bi br ha uh gp em\n"); | |
2888 | else | |
60f0438a | 2889 | proto_seq_printf(seq, list_entry(v, struct proto, node)); |
1da177e4 LT |
2890 | return 0; |
2891 | } | |
2892 | ||
f690808e | 2893 | static const struct seq_operations proto_seq_ops = { |
1da177e4 LT |
2894 | .start = proto_seq_start, |
2895 | .next = proto_seq_next, | |
2896 | .stop = proto_seq_stop, | |
2897 | .show = proto_seq_show, | |
2898 | }; | |
2899 | ||
2900 | static int proto_seq_open(struct inode *inode, struct file *file) | |
2901 | { | |
14e943db ED |
2902 | return seq_open_net(inode, file, &proto_seq_ops, |
2903 | sizeof(struct seq_net_private)); | |
1da177e4 LT |
2904 | } |
2905 | ||
9a32144e | 2906 | static const struct file_operations proto_seq_fops = { |
1da177e4 LT |
2907 | .owner = THIS_MODULE, |
2908 | .open = proto_seq_open, | |
2909 | .read = seq_read, | |
2910 | .llseek = seq_lseek, | |
14e943db ED |
2911 | .release = seq_release_net, |
2912 | }; | |
2913 | ||
2914 | static __net_init int proto_init_net(struct net *net) | |
2915 | { | |
d4beaa66 | 2916 | if (!proc_create("protocols", S_IRUGO, net->proc_net, &proto_seq_fops)) |
14e943db ED |
2917 | return -ENOMEM; |
2918 | ||
2919 | return 0; | |
2920 | } | |
2921 | ||
2922 | static __net_exit void proto_exit_net(struct net *net) | |
2923 | { | |
ece31ffd | 2924 | remove_proc_entry("protocols", net->proc_net); |
14e943db ED |
2925 | } |
2926 | ||
2927 | ||
2928 | static __net_initdata struct pernet_operations proto_net_ops = { | |
2929 | .init = proto_init_net, | |
2930 | .exit = proto_exit_net, | |
1da177e4 LT |
2931 | }; |
2932 | ||
2933 | static int __init proto_init(void) | |
2934 | { | |
14e943db | 2935 | return register_pernet_subsys(&proto_net_ops); |
1da177e4 LT |
2936 | } |
2937 | ||
2938 | subsys_initcall(proto_init); | |
2939 | ||
2940 | #endif /* PROC_FS */ |