Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * INET An implementation of the TCP/IP protocol suite for the LINUX | |
3 | * operating system. INET is implemented using the BSD Socket | |
4 | * interface as the means of communication with the user level. | |
5 | * | |
6 | * Generic socket support routines. Memory allocators, socket lock/release | |
7 | * handler for protocols to use and generic option handler. | |
8 | * | |
9 | * | |
02c30a84 | 10 | * Authors: Ross Biro |
1da177e4 LT |
11 | * Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG> |
12 | * Florian La Roche, <flla@stud.uni-sb.de> | |
13 | * Alan Cox, <A.Cox@swansea.ac.uk> | |
14 | * | |
15 | * Fixes: | |
16 | * Alan Cox : Numerous verify_area() problems | |
17 | * Alan Cox : Connecting on a connecting socket | |
18 | * now returns an error for tcp. | |
19 | * Alan Cox : sock->protocol is set correctly. | |
20 | * and is not sometimes left as 0. | |
21 | * Alan Cox : connect handles icmp errors on a | |
22 | * connect properly. Unfortunately there | |
23 | * is a restart syscall nasty there. I | |
24 | * can't match BSD without hacking the C | |
25 | * library. Ideas urgently sought! | |
26 | * Alan Cox : Disallow bind() to addresses that are | |
27 | * not ours - especially broadcast ones!! | |
28 | * Alan Cox : Socket 1024 _IS_ ok for users. (fencepost) | |
29 | * Alan Cox : sock_wfree/sock_rfree don't destroy sockets, | |
30 | * instead they leave that for the DESTROY timer. | |
31 | * Alan Cox : Clean up error flag in accept | |
32 | * Alan Cox : TCP ack handling is buggy, the DESTROY timer | |
33 | * was buggy. Put a remove_sock() in the handler | |
34 | * for memory when we hit 0. Also altered the timer | |
4ec93edb | 35 | * code. The ACK stuff can wait and needs major |
1da177e4 LT |
36 | * TCP layer surgery. |
37 | * Alan Cox : Fixed TCP ack bug, removed remove sock | |
38 | * and fixed timer/inet_bh race. | |
39 | * Alan Cox : Added zapped flag for TCP | |
40 | * Alan Cox : Move kfree_skb into skbuff.c and tidied up surplus code | |
41 | * Alan Cox : for new sk_buff allocations wmalloc/rmalloc now call alloc_skb | |
42 | * Alan Cox : kfree_s calls now are kfree_skbmem so we can track skb resources | |
43 | * Alan Cox : Supports socket option broadcast now as does udp. Packet and raw need fixing. | |
44 | * Alan Cox : Added RCVBUF,SNDBUF size setting. It suddenly occurred to me how easy it was so... | |
45 | * Rick Sladkey : Relaxed UDP rules for matching packets. | |
46 | * C.E.Hawkins : IFF_PROMISC/SIOCGHWADDR support | |
47 | * Pauline Middelink : identd support | |
48 | * Alan Cox : Fixed connect() taking signals I think. | |
49 | * Alan Cox : SO_LINGER supported | |
50 | * Alan Cox : Error reporting fixes | |
51 | * Anonymous : inet_create tidied up (sk->reuse setting) | |
52 | * Alan Cox : inet sockets don't set sk->type! | |
53 | * Alan Cox : Split socket option code | |
54 | * Alan Cox : Callbacks | |
55 | * Alan Cox : Nagle flag for Charles & Johannes stuff | |
56 | * Alex : Removed restriction on inet fioctl | |
57 | * Alan Cox : Splitting INET from NET core | |
58 | * Alan Cox : Fixed bogus SO_TYPE handling in getsockopt() | |
59 | * Adam Caldwell : Missing return in SO_DONTROUTE/SO_DEBUG code | |
60 | * Alan Cox : Split IP from generic code | |
61 | * Alan Cox : New kfree_skbmem() | |
62 | * Alan Cox : Make SO_DEBUG superuser only. | |
63 | * Alan Cox : Allow anyone to clear SO_DEBUG | |
64 | * (compatibility fix) | |
65 | * Alan Cox : Added optimistic memory grabbing for AF_UNIX throughput. | |
66 | * Alan Cox : Allocator for a socket is settable. | |
67 | * Alan Cox : SO_ERROR includes soft errors. | |
68 | * Alan Cox : Allow NULL arguments on some SO_ opts | |
69 | * Alan Cox : Generic socket allocation to make hooks | |
70 | * easier (suggested by Craig Metz). | |
71 | * Michael Pall : SO_ERROR returns positive errno again | |
72 | * Steve Whitehouse: Added default destructor to free | |
73 | * protocol private data. | |
74 | * Steve Whitehouse: Added various other default routines | |
75 | * common to several socket families. | |
76 | * Chris Evans : Call suser() check last on F_SETOWN | |
77 | * Jay Schulist : Added SO_ATTACH_FILTER and SO_DETACH_FILTER. | |
78 | * Andi Kleen : Add sock_kmalloc()/sock_kfree_s() | |
79 | * Andi Kleen : Fix write_space callback | |
80 | * Chris Evans : Security fixes - signedness again | |
81 | * Arnaldo C. Melo : cleanups, use skb_queue_purge | |
82 | * | |
83 | * To Fix: | |
84 | * | |
85 | * | |
86 | * This program is free software; you can redistribute it and/or | |
87 | * modify it under the terms of the GNU General Public License | |
88 | * as published by the Free Software Foundation; either version | |
89 | * 2 of the License, or (at your option) any later version. | |
90 | */ | |
91 | ||
e005d193 JP |
92 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
93 | ||
4fc268d2 | 94 | #include <linux/capability.h> |
1da177e4 | 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> | |
f1083048 | 105 | #include <linux/sched/mm.h> |
1da177e4 LT |
106 | #include <linux/timer.h> |
107 | #include <linux/string.h> | |
108 | #include <linux/sockios.h> | |
109 | #include <linux/net.h> | |
110 | #include <linux/mm.h> | |
111 | #include <linux/slab.h> | |
112 | #include <linux/interrupt.h> | |
113 | #include <linux/poll.h> | |
114 | #include <linux/tcp.h> | |
115 | #include <linux/init.h> | |
a1f8e7f7 | 116 | #include <linux/highmem.h> |
3f551f94 | 117 | #include <linux/user_namespace.h> |
c5905afb | 118 | #include <linux/static_key.h> |
3969eb38 | 119 | #include <linux/memcontrol.h> |
8c1ae10d | 120 | #include <linux/prefetch.h> |
1da177e4 | 121 | |
7c0f6ba6 | 122 | #include <linux/uaccess.h> |
1da177e4 LT |
123 | |
124 | #include <linux/netdevice.h> | |
125 | #include <net/protocol.h> | |
126 | #include <linux/skbuff.h> | |
457c4cbc | 127 | #include <net/net_namespace.h> |
2e6599cb | 128 | #include <net/request_sock.h> |
1da177e4 | 129 | #include <net/sock.h> |
20d49473 | 130 | #include <linux/net_tstamp.h> |
1da177e4 LT |
131 | #include <net/xfrm.h> |
132 | #include <linux/ipsec.h> | |
f8451725 | 133 | #include <net/cls_cgroup.h> |
5bc1421e | 134 | #include <net/netprio_cgroup.h> |
eb4cb008 | 135 | #include <linux/sock_diag.h> |
1da177e4 LT |
136 | |
137 | #include <linux/filter.h> | |
538950a1 | 138 | #include <net/sock_reuseport.h> |
1da177e4 | 139 | |
3847ce32 SM |
140 | #include <trace/events/sock.h> |
141 | ||
1da177e4 | 142 | #include <net/tcp.h> |
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 | ||
a3b299da EB |
148 | /** |
149 | * sk_ns_capable - General socket capability test | |
150 | * @sk: Socket to use a capability on or through | |
151 | * @user_ns: The user namespace of the capability to use | |
152 | * @cap: The capability to use | |
153 | * | |
154 | * Test to see if the opener of the socket had when the socket was | |
155 | * created and the current process has the capability @cap in the user | |
156 | * namespace @user_ns. | |
157 | */ | |
158 | bool sk_ns_capable(const struct sock *sk, | |
159 | struct user_namespace *user_ns, int cap) | |
160 | { | |
161 | return file_ns_capable(sk->sk_socket->file, user_ns, cap) && | |
162 | ns_capable(user_ns, cap); | |
163 | } | |
164 | EXPORT_SYMBOL(sk_ns_capable); | |
165 | ||
166 | /** | |
167 | * sk_capable - Socket global capability test | |
168 | * @sk: Socket to use a capability on or through | |
e793c0f7 | 169 | * @cap: The global capability to use |
a3b299da EB |
170 | * |
171 | * Test to see if the opener of the socket had when the socket was | |
172 | * created and the current process has the capability @cap in all user | |
173 | * namespaces. | |
174 | */ | |
175 | bool sk_capable(const struct sock *sk, int cap) | |
176 | { | |
177 | return sk_ns_capable(sk, &init_user_ns, cap); | |
178 | } | |
179 | EXPORT_SYMBOL(sk_capable); | |
180 | ||
181 | /** | |
182 | * sk_net_capable - Network namespace socket capability test | |
183 | * @sk: Socket to use a capability on or through | |
184 | * @cap: The capability to use | |
185 | * | |
e793c0f7 | 186 | * Test to see if the opener of the socket had when the socket was created |
a3b299da EB |
187 | * and the current process has the capability @cap over the network namespace |
188 | * the socket is a member of. | |
189 | */ | |
190 | bool sk_net_capable(const struct sock *sk, int cap) | |
191 | { | |
192 | return sk_ns_capable(sk, sock_net(sk)->user_ns, cap); | |
193 | } | |
194 | EXPORT_SYMBOL(sk_net_capable); | |
195 | ||
da21f24d IM |
196 | /* |
197 | * Each address family might have different locking rules, so we have | |
cdfbabfb DH |
198 | * one slock key per address family and separate keys for internal and |
199 | * userspace sockets. | |
da21f24d | 200 | */ |
a5b5bb9a | 201 | static struct lock_class_key af_family_keys[AF_MAX]; |
cdfbabfb | 202 | static struct lock_class_key af_family_kern_keys[AF_MAX]; |
a5b5bb9a | 203 | static struct lock_class_key af_family_slock_keys[AF_MAX]; |
cdfbabfb | 204 | static struct lock_class_key af_family_kern_slock_keys[AF_MAX]; |
a5b5bb9a | 205 | |
a5b5bb9a IM |
206 | /* |
207 | * Make lock validator output more readable. (we pre-construct these | |
208 | * strings build-time, so that runtime initialization of socket | |
209 | * locks is fast): | |
210 | */ | |
cdfbabfb DH |
211 | |
212 | #define _sock_locks(x) \ | |
213 | x "AF_UNSPEC", x "AF_UNIX" , x "AF_INET" , \ | |
214 | x "AF_AX25" , x "AF_IPX" , x "AF_APPLETALK", \ | |
215 | x "AF_NETROM", x "AF_BRIDGE" , x "AF_ATMPVC" , \ | |
216 | x "AF_X25" , x "AF_INET6" , x "AF_ROSE" , \ | |
217 | x "AF_DECnet", x "AF_NETBEUI" , x "AF_SECURITY" , \ | |
218 | x "AF_KEY" , x "AF_NETLINK" , x "AF_PACKET" , \ | |
219 | x "AF_ASH" , x "AF_ECONET" , x "AF_ATMSVC" , \ | |
220 | x "AF_RDS" , x "AF_SNA" , x "AF_IRDA" , \ | |
221 | x "AF_PPPOX" , x "AF_WANPIPE" , x "AF_LLC" , \ | |
222 | x "27" , x "28" , x "AF_CAN" , \ | |
223 | x "AF_TIPC" , x "AF_BLUETOOTH", x "IUCV" , \ | |
224 | x "AF_RXRPC" , x "AF_ISDN" , x "AF_PHONET" , \ | |
225 | x "AF_IEEE802154", x "AF_CAIF" , x "AF_ALG" , \ | |
226 | x "AF_NFC" , x "AF_VSOCK" , x "AF_KCM" , \ | |
227 | x "AF_QIPCRTR", x "AF_SMC" , x "AF_MAX" | |
228 | ||
36cbd3dc | 229 | static const char *const af_family_key_strings[AF_MAX+1] = { |
cdfbabfb | 230 | _sock_locks("sk_lock-") |
a5b5bb9a | 231 | }; |
36cbd3dc | 232 | static const char *const af_family_slock_key_strings[AF_MAX+1] = { |
cdfbabfb | 233 | _sock_locks("slock-") |
a5b5bb9a | 234 | }; |
36cbd3dc | 235 | static const char *const af_family_clock_key_strings[AF_MAX+1] = { |
cdfbabfb DH |
236 | _sock_locks("clock-") |
237 | }; | |
238 | ||
239 | static const char *const af_family_kern_key_strings[AF_MAX+1] = { | |
240 | _sock_locks("k-sk_lock-") | |
241 | }; | |
242 | static const char *const af_family_kern_slock_key_strings[AF_MAX+1] = { | |
243 | _sock_locks("k-slock-") | |
244 | }; | |
245 | static const char *const af_family_kern_clock_key_strings[AF_MAX+1] = { | |
246 | _sock_locks("k-clock-") | |
443aef0e | 247 | }; |
581319c5 PA |
248 | static const char *const af_family_rlock_key_strings[AF_MAX+1] = { |
249 | "rlock-AF_UNSPEC", "rlock-AF_UNIX" , "rlock-AF_INET" , | |
250 | "rlock-AF_AX25" , "rlock-AF_IPX" , "rlock-AF_APPLETALK", | |
251 | "rlock-AF_NETROM", "rlock-AF_BRIDGE" , "rlock-AF_ATMPVC" , | |
252 | "rlock-AF_X25" , "rlock-AF_INET6" , "rlock-AF_ROSE" , | |
253 | "rlock-AF_DECnet", "rlock-AF_NETBEUI" , "rlock-AF_SECURITY" , | |
254 | "rlock-AF_KEY" , "rlock-AF_NETLINK" , "rlock-AF_PACKET" , | |
255 | "rlock-AF_ASH" , "rlock-AF_ECONET" , "rlock-AF_ATMSVC" , | |
256 | "rlock-AF_RDS" , "rlock-AF_SNA" , "rlock-AF_IRDA" , | |
257 | "rlock-AF_PPPOX" , "rlock-AF_WANPIPE" , "rlock-AF_LLC" , | |
258 | "rlock-27" , "rlock-28" , "rlock-AF_CAN" , | |
259 | "rlock-AF_TIPC" , "rlock-AF_BLUETOOTH", "rlock-AF_IUCV" , | |
260 | "rlock-AF_RXRPC" , "rlock-AF_ISDN" , "rlock-AF_PHONET" , | |
261 | "rlock-AF_IEEE802154", "rlock-AF_CAIF" , "rlock-AF_ALG" , | |
262 | "rlock-AF_NFC" , "rlock-AF_VSOCK" , "rlock-AF_KCM" , | |
263 | "rlock-AF_QIPCRTR", "rlock-AF_SMC" , "rlock-AF_MAX" | |
264 | }; | |
265 | static const char *const af_family_wlock_key_strings[AF_MAX+1] = { | |
266 | "wlock-AF_UNSPEC", "wlock-AF_UNIX" , "wlock-AF_INET" , | |
267 | "wlock-AF_AX25" , "wlock-AF_IPX" , "wlock-AF_APPLETALK", | |
268 | "wlock-AF_NETROM", "wlock-AF_BRIDGE" , "wlock-AF_ATMPVC" , | |
269 | "wlock-AF_X25" , "wlock-AF_INET6" , "wlock-AF_ROSE" , | |
270 | "wlock-AF_DECnet", "wlock-AF_NETBEUI" , "wlock-AF_SECURITY" , | |
271 | "wlock-AF_KEY" , "wlock-AF_NETLINK" , "wlock-AF_PACKET" , | |
272 | "wlock-AF_ASH" , "wlock-AF_ECONET" , "wlock-AF_ATMSVC" , | |
273 | "wlock-AF_RDS" , "wlock-AF_SNA" , "wlock-AF_IRDA" , | |
274 | "wlock-AF_PPPOX" , "wlock-AF_WANPIPE" , "wlock-AF_LLC" , | |
275 | "wlock-27" , "wlock-28" , "wlock-AF_CAN" , | |
276 | "wlock-AF_TIPC" , "wlock-AF_BLUETOOTH", "wlock-AF_IUCV" , | |
277 | "wlock-AF_RXRPC" , "wlock-AF_ISDN" , "wlock-AF_PHONET" , | |
278 | "wlock-AF_IEEE802154", "wlock-AF_CAIF" , "wlock-AF_ALG" , | |
279 | "wlock-AF_NFC" , "wlock-AF_VSOCK" , "wlock-AF_KCM" , | |
280 | "wlock-AF_QIPCRTR", "wlock-AF_SMC" , "wlock-AF_MAX" | |
281 | }; | |
282 | static const char *const af_family_elock_key_strings[AF_MAX+1] = { | |
283 | "elock-AF_UNSPEC", "elock-AF_UNIX" , "elock-AF_INET" , | |
284 | "elock-AF_AX25" , "elock-AF_IPX" , "elock-AF_APPLETALK", | |
285 | "elock-AF_NETROM", "elock-AF_BRIDGE" , "elock-AF_ATMPVC" , | |
286 | "elock-AF_X25" , "elock-AF_INET6" , "elock-AF_ROSE" , | |
287 | "elock-AF_DECnet", "elock-AF_NETBEUI" , "elock-AF_SECURITY" , | |
288 | "elock-AF_KEY" , "elock-AF_NETLINK" , "elock-AF_PACKET" , | |
289 | "elock-AF_ASH" , "elock-AF_ECONET" , "elock-AF_ATMSVC" , | |
290 | "elock-AF_RDS" , "elock-AF_SNA" , "elock-AF_IRDA" , | |
291 | "elock-AF_PPPOX" , "elock-AF_WANPIPE" , "elock-AF_LLC" , | |
292 | "elock-27" , "elock-28" , "elock-AF_CAN" , | |
293 | "elock-AF_TIPC" , "elock-AF_BLUETOOTH", "elock-AF_IUCV" , | |
294 | "elock-AF_RXRPC" , "elock-AF_ISDN" , "elock-AF_PHONET" , | |
295 | "elock-AF_IEEE802154", "elock-AF_CAIF" , "elock-AF_ALG" , | |
296 | "elock-AF_NFC" , "elock-AF_VSOCK" , "elock-AF_KCM" , | |
297 | "elock-AF_QIPCRTR", "elock-AF_SMC" , "elock-AF_MAX" | |
298 | }; | |
da21f24d IM |
299 | |
300 | /* | |
581319c5 | 301 | * sk_callback_lock and sk queues locking rules are per-address-family, |
da21f24d IM |
302 | * so split the lock classes by using a per-AF key: |
303 | */ | |
304 | static struct lock_class_key af_callback_keys[AF_MAX]; | |
581319c5 PA |
305 | static struct lock_class_key af_rlock_keys[AF_MAX]; |
306 | static struct lock_class_key af_wlock_keys[AF_MAX]; | |
307 | static struct lock_class_key af_elock_keys[AF_MAX]; | |
cdfbabfb | 308 | static struct lock_class_key af_kern_callback_keys[AF_MAX]; |
da21f24d | 309 | |
1da177e4 | 310 | /* Run time adjustable parameters. */ |
ab32ea5d | 311 | __u32 sysctl_wmem_max __read_mostly = SK_WMEM_MAX; |
6d8ebc8a | 312 | EXPORT_SYMBOL(sysctl_wmem_max); |
ab32ea5d | 313 | __u32 sysctl_rmem_max __read_mostly = SK_RMEM_MAX; |
6d8ebc8a | 314 | EXPORT_SYMBOL(sysctl_rmem_max); |
ab32ea5d BH |
315 | __u32 sysctl_wmem_default __read_mostly = SK_WMEM_MAX; |
316 | __u32 sysctl_rmem_default __read_mostly = SK_RMEM_MAX; | |
1da177e4 | 317 | |
25985edc | 318 | /* Maximal space eaten by iovec or ancillary data plus some space */ |
ab32ea5d | 319 | int sysctl_optmem_max __read_mostly = sizeof(unsigned long)*(2*UIO_MAXIOV+512); |
2a91525c | 320 | EXPORT_SYMBOL(sysctl_optmem_max); |
1da177e4 | 321 | |
b245be1f WB |
322 | int sysctl_tstamp_allow_data __read_mostly = 1; |
323 | ||
c93bdd0e MG |
324 | struct static_key memalloc_socks = STATIC_KEY_INIT_FALSE; |
325 | EXPORT_SYMBOL_GPL(memalloc_socks); | |
326 | ||
7cb02404 MG |
327 | /** |
328 | * sk_set_memalloc - sets %SOCK_MEMALLOC | |
329 | * @sk: socket to set it on | |
330 | * | |
331 | * Set %SOCK_MEMALLOC on a socket for access to emergency reserves. | |
332 | * It's the responsibility of the admin to adjust min_free_kbytes | |
333 | * to meet the requirements | |
334 | */ | |
335 | void sk_set_memalloc(struct sock *sk) | |
336 | { | |
337 | sock_set_flag(sk, SOCK_MEMALLOC); | |
338 | sk->sk_allocation |= __GFP_MEMALLOC; | |
c93bdd0e | 339 | static_key_slow_inc(&memalloc_socks); |
7cb02404 MG |
340 | } |
341 | EXPORT_SYMBOL_GPL(sk_set_memalloc); | |
342 | ||
343 | void sk_clear_memalloc(struct sock *sk) | |
344 | { | |
345 | sock_reset_flag(sk, SOCK_MEMALLOC); | |
346 | sk->sk_allocation &= ~__GFP_MEMALLOC; | |
c93bdd0e | 347 | static_key_slow_dec(&memalloc_socks); |
c76562b6 MG |
348 | |
349 | /* | |
350 | * SOCK_MEMALLOC is allowed to ignore rmem limits to ensure forward | |
5d753610 MG |
351 | * progress of swapping. SOCK_MEMALLOC may be cleared while |
352 | * it has rmem allocations due to the last swapfile being deactivated | |
353 | * but there is a risk that the socket is unusable due to exceeding | |
354 | * the rmem limits. Reclaim the reserves and obey rmem limits again. | |
c76562b6 | 355 | */ |
5d753610 | 356 | sk_mem_reclaim(sk); |
7cb02404 MG |
357 | } |
358 | EXPORT_SYMBOL_GPL(sk_clear_memalloc); | |
359 | ||
b4b9e355 MG |
360 | int __sk_backlog_rcv(struct sock *sk, struct sk_buff *skb) |
361 | { | |
362 | int ret; | |
f1083048 | 363 | unsigned int noreclaim_flag; |
b4b9e355 MG |
364 | |
365 | /* these should have been dropped before queueing */ | |
366 | BUG_ON(!sock_flag(sk, SOCK_MEMALLOC)); | |
367 | ||
f1083048 | 368 | noreclaim_flag = memalloc_noreclaim_save(); |
b4b9e355 | 369 | ret = sk->sk_backlog_rcv(sk, skb); |
f1083048 | 370 | memalloc_noreclaim_restore(noreclaim_flag); |
b4b9e355 MG |
371 | |
372 | return ret; | |
373 | } | |
374 | EXPORT_SYMBOL(__sk_backlog_rcv); | |
375 | ||
1da177e4 LT |
376 | static int sock_set_timeout(long *timeo_p, char __user *optval, int optlen) |
377 | { | |
378 | struct timeval tv; | |
379 | ||
380 | if (optlen < sizeof(tv)) | |
381 | return -EINVAL; | |
382 | if (copy_from_user(&tv, optval, sizeof(tv))) | |
383 | return -EFAULT; | |
ba78073e VA |
384 | if (tv.tv_usec < 0 || tv.tv_usec >= USEC_PER_SEC) |
385 | return -EDOM; | |
1da177e4 | 386 | |
ba78073e | 387 | if (tv.tv_sec < 0) { |
6f11df83 AM |
388 | static int warned __read_mostly; |
389 | ||
ba78073e | 390 | *timeo_p = 0; |
50aab54f | 391 | if (warned < 10 && net_ratelimit()) { |
ba78073e | 392 | warned++; |
e005d193 JP |
393 | pr_info("%s: `%s' (pid %d) tries to set negative timeout\n", |
394 | __func__, current->comm, task_pid_nr(current)); | |
50aab54f | 395 | } |
ba78073e VA |
396 | return 0; |
397 | } | |
1da177e4 LT |
398 | *timeo_p = MAX_SCHEDULE_TIMEOUT; |
399 | if (tv.tv_sec == 0 && tv.tv_usec == 0) | |
400 | return 0; | |
401 | if (tv.tv_sec < (MAX_SCHEDULE_TIMEOUT/HZ - 1)) | |
8ccde4c5 | 402 | *timeo_p = tv.tv_sec * HZ + DIV_ROUND_UP(tv.tv_usec, USEC_PER_SEC / HZ); |
1da177e4 LT |
403 | return 0; |
404 | } | |
405 | ||
406 | static void sock_warn_obsolete_bsdism(const char *name) | |
407 | { | |
408 | static int warned; | |
409 | static char warncomm[TASK_COMM_LEN]; | |
4ec93edb YH |
410 | if (strcmp(warncomm, current->comm) && warned < 5) { |
411 | strcpy(warncomm, current->comm); | |
e005d193 JP |
412 | pr_warn("process `%s' is using obsolete %s SO_BSDCOMPAT\n", |
413 | warncomm, name); | |
1da177e4 LT |
414 | warned++; |
415 | } | |
416 | } | |
417 | ||
080a270f HFS |
418 | static bool sock_needs_netstamp(const struct sock *sk) |
419 | { | |
420 | switch (sk->sk_family) { | |
421 | case AF_UNSPEC: | |
422 | case AF_UNIX: | |
423 | return false; | |
424 | default: | |
425 | return true; | |
426 | } | |
427 | } | |
428 | ||
08e29af3 | 429 | static void sock_disable_timestamp(struct sock *sk, unsigned long flags) |
4ec93edb | 430 | { |
08e29af3 ED |
431 | if (sk->sk_flags & flags) { |
432 | sk->sk_flags &= ~flags; | |
080a270f HFS |
433 | if (sock_needs_netstamp(sk) && |
434 | !(sk->sk_flags & SK_FLAGS_TIMESTAMP)) | |
20d49473 | 435 | net_disable_timestamp(); |
1da177e4 LT |
436 | } |
437 | } | |
438 | ||
439 | ||
e6afc8ac | 440 | int __sock_queue_rcv_skb(struct sock *sk, struct sk_buff *skb) |
f0088a50 | 441 | { |
3b885787 NH |
442 | unsigned long flags; |
443 | struct sk_buff_head *list = &sk->sk_receive_queue; | |
f0088a50 | 444 | |
0fd7bac6 | 445 | if (atomic_read(&sk->sk_rmem_alloc) >= sk->sk_rcvbuf) { |
766e9037 | 446 | atomic_inc(&sk->sk_drops); |
3847ce32 | 447 | trace_sock_rcvqueue_full(sk, skb); |
766e9037 | 448 | return -ENOMEM; |
f0088a50 DV |
449 | } |
450 | ||
c76562b6 | 451 | if (!sk_rmem_schedule(sk, skb, skb->truesize)) { |
766e9037 ED |
452 | atomic_inc(&sk->sk_drops); |
453 | return -ENOBUFS; | |
3ab224be HA |
454 | } |
455 | ||
f0088a50 DV |
456 | skb->dev = NULL; |
457 | skb_set_owner_r(skb, sk); | |
49ad9599 | 458 | |
7fee226a ED |
459 | /* we escape from rcu protected region, make sure we dont leak |
460 | * a norefcounted dst | |
461 | */ | |
462 | skb_dst_force(skb); | |
463 | ||
3b885787 | 464 | spin_lock_irqsave(&list->lock, flags); |
3bc3b96f | 465 | sock_skb_set_dropcount(sk, skb); |
3b885787 NH |
466 | __skb_queue_tail(list, skb); |
467 | spin_unlock_irqrestore(&list->lock, flags); | |
f0088a50 DV |
468 | |
469 | if (!sock_flag(sk, SOCK_DEAD)) | |
676d2369 | 470 | sk->sk_data_ready(sk); |
766e9037 | 471 | return 0; |
f0088a50 | 472 | } |
e6afc8ac | 473 | EXPORT_SYMBOL(__sock_queue_rcv_skb); |
474 | ||
475 | int sock_queue_rcv_skb(struct sock *sk, struct sk_buff *skb) | |
476 | { | |
477 | int err; | |
478 | ||
479 | err = sk_filter(sk, skb); | |
480 | if (err) | |
481 | return err; | |
482 | ||
483 | return __sock_queue_rcv_skb(sk, skb); | |
484 | } | |
f0088a50 DV |
485 | EXPORT_SYMBOL(sock_queue_rcv_skb); |
486 | ||
4f0c40d9 | 487 | int __sk_receive_skb(struct sock *sk, struct sk_buff *skb, |
c3f24cfb | 488 | const int nested, unsigned int trim_cap, bool refcounted) |
f0088a50 DV |
489 | { |
490 | int rc = NET_RX_SUCCESS; | |
491 | ||
4f0c40d9 | 492 | if (sk_filter_trim_cap(sk, skb, trim_cap)) |
f0088a50 DV |
493 | goto discard_and_relse; |
494 | ||
495 | skb->dev = NULL; | |
496 | ||
274f482d | 497 | if (sk_rcvqueues_full(sk, sk->sk_rcvbuf)) { |
c377411f ED |
498 | atomic_inc(&sk->sk_drops); |
499 | goto discard_and_relse; | |
500 | } | |
58a5a7b9 ACM |
501 | if (nested) |
502 | bh_lock_sock_nested(sk); | |
503 | else | |
504 | bh_lock_sock(sk); | |
a5b5bb9a IM |
505 | if (!sock_owned_by_user(sk)) { |
506 | /* | |
507 | * trylock + unlock semantics: | |
508 | */ | |
509 | mutex_acquire(&sk->sk_lock.dep_map, 0, 1, _RET_IP_); | |
510 | ||
c57943a1 | 511 | rc = sk_backlog_rcv(sk, skb); |
a5b5bb9a IM |
512 | |
513 | mutex_release(&sk->sk_lock.dep_map, 1, _RET_IP_); | |
f545a38f | 514 | } else if (sk_add_backlog(sk, skb, sk->sk_rcvbuf)) { |
8eae939f ZY |
515 | bh_unlock_sock(sk); |
516 | atomic_inc(&sk->sk_drops); | |
517 | goto discard_and_relse; | |
518 | } | |
519 | ||
f0088a50 DV |
520 | bh_unlock_sock(sk); |
521 | out: | |
c3f24cfb ED |
522 | if (refcounted) |
523 | sock_put(sk); | |
f0088a50 DV |
524 | return rc; |
525 | discard_and_relse: | |
526 | kfree_skb(skb); | |
527 | goto out; | |
528 | } | |
4f0c40d9 | 529 | EXPORT_SYMBOL(__sk_receive_skb); |
f0088a50 DV |
530 | |
531 | struct dst_entry *__sk_dst_check(struct sock *sk, u32 cookie) | |
532 | { | |
b6c6712a | 533 | struct dst_entry *dst = __sk_dst_get(sk); |
f0088a50 DV |
534 | |
535 | if (dst && dst->obsolete && dst->ops->check(dst, cookie) == NULL) { | |
e022f0b4 | 536 | sk_tx_queue_clear(sk); |
9b8805a3 | 537 | sk->sk_dst_pending_confirm = 0; |
a9b3cd7f | 538 | RCU_INIT_POINTER(sk->sk_dst_cache, NULL); |
f0088a50 DV |
539 | dst_release(dst); |
540 | return NULL; | |
541 | } | |
542 | ||
543 | return dst; | |
544 | } | |
545 | EXPORT_SYMBOL(__sk_dst_check); | |
546 | ||
547 | struct dst_entry *sk_dst_check(struct sock *sk, u32 cookie) | |
548 | { | |
549 | struct dst_entry *dst = sk_dst_get(sk); | |
550 | ||
551 | if (dst && dst->obsolete && dst->ops->check(dst, cookie) == NULL) { | |
552 | sk_dst_reset(sk); | |
553 | dst_release(dst); | |
554 | return NULL; | |
555 | } | |
556 | ||
557 | return dst; | |
558 | } | |
559 | EXPORT_SYMBOL(sk_dst_check); | |
560 | ||
c91f6df2 BH |
561 | static int sock_setbindtodevice(struct sock *sk, char __user *optval, |
562 | int optlen) | |
4878809f DM |
563 | { |
564 | int ret = -ENOPROTOOPT; | |
565 | #ifdef CONFIG_NETDEVICES | |
3b1e0a65 | 566 | struct net *net = sock_net(sk); |
4878809f DM |
567 | char devname[IFNAMSIZ]; |
568 | int index; | |
569 | ||
570 | /* Sorry... */ | |
571 | ret = -EPERM; | |
5e1fccc0 | 572 | if (!ns_capable(net->user_ns, CAP_NET_RAW)) |
4878809f DM |
573 | goto out; |
574 | ||
575 | ret = -EINVAL; | |
576 | if (optlen < 0) | |
577 | goto out; | |
578 | ||
579 | /* Bind this socket to a particular device like "eth0", | |
580 | * as specified in the passed interface name. If the | |
581 | * name is "" or the option length is zero the socket | |
582 | * is not bound. | |
583 | */ | |
584 | if (optlen > IFNAMSIZ - 1) | |
585 | optlen = IFNAMSIZ - 1; | |
586 | memset(devname, 0, sizeof(devname)); | |
587 | ||
588 | ret = -EFAULT; | |
589 | if (copy_from_user(devname, optval, optlen)) | |
590 | goto out; | |
591 | ||
000ba2e4 DM |
592 | index = 0; |
593 | if (devname[0] != '\0') { | |
bf8e56bf | 594 | struct net_device *dev; |
4878809f | 595 | |
bf8e56bf ED |
596 | rcu_read_lock(); |
597 | dev = dev_get_by_name_rcu(net, devname); | |
598 | if (dev) | |
599 | index = dev->ifindex; | |
600 | rcu_read_unlock(); | |
4878809f DM |
601 | ret = -ENODEV; |
602 | if (!dev) | |
603 | goto out; | |
4878809f DM |
604 | } |
605 | ||
606 | lock_sock(sk); | |
607 | sk->sk_bound_dev_if = index; | |
608 | sk_dst_reset(sk); | |
609 | release_sock(sk); | |
610 | ||
611 | ret = 0; | |
612 | ||
613 | out: | |
614 | #endif | |
615 | ||
616 | return ret; | |
617 | } | |
618 | ||
c91f6df2 BH |
619 | static int sock_getbindtodevice(struct sock *sk, char __user *optval, |
620 | int __user *optlen, int len) | |
621 | { | |
622 | int ret = -ENOPROTOOPT; | |
623 | #ifdef CONFIG_NETDEVICES | |
624 | struct net *net = sock_net(sk); | |
c91f6df2 | 625 | char devname[IFNAMSIZ]; |
c91f6df2 BH |
626 | |
627 | if (sk->sk_bound_dev_if == 0) { | |
628 | len = 0; | |
629 | goto zero; | |
630 | } | |
631 | ||
632 | ret = -EINVAL; | |
633 | if (len < IFNAMSIZ) | |
634 | goto out; | |
635 | ||
5dbe7c17 NS |
636 | ret = netdev_get_name(net, devname, sk->sk_bound_dev_if); |
637 | if (ret) | |
c91f6df2 | 638 | goto out; |
c91f6df2 BH |
639 | |
640 | len = strlen(devname) + 1; | |
641 | ||
642 | ret = -EFAULT; | |
643 | if (copy_to_user(optval, devname, len)) | |
644 | goto out; | |
645 | ||
646 | zero: | |
647 | ret = -EFAULT; | |
648 | if (put_user(len, optlen)) | |
649 | goto out; | |
650 | ||
651 | ret = 0; | |
652 | ||
653 | out: | |
654 | #endif | |
655 | ||
656 | return ret; | |
657 | } | |
658 | ||
c0ef877b PE |
659 | static inline void sock_valbool_flag(struct sock *sk, int bit, int valbool) |
660 | { | |
661 | if (valbool) | |
662 | sock_set_flag(sk, bit); | |
663 | else | |
664 | sock_reset_flag(sk, bit); | |
665 | } | |
666 | ||
f60e5990 | 667 | bool sk_mc_loop(struct sock *sk) |
668 | { | |
669 | if (dev_recursion_level()) | |
670 | return false; | |
671 | if (!sk) | |
672 | return true; | |
673 | switch (sk->sk_family) { | |
674 | case AF_INET: | |
675 | return inet_sk(sk)->mc_loop; | |
676 | #if IS_ENABLED(CONFIG_IPV6) | |
677 | case AF_INET6: | |
678 | return inet6_sk(sk)->mc_loop; | |
679 | #endif | |
680 | } | |
681 | WARN_ON(1); | |
682 | return true; | |
683 | } | |
684 | EXPORT_SYMBOL(sk_mc_loop); | |
685 | ||
1da177e4 LT |
686 | /* |
687 | * This is meant for all protocols to use and covers goings on | |
688 | * at the socket level. Everything here is generic. | |
689 | */ | |
690 | ||
691 | int sock_setsockopt(struct socket *sock, int level, int optname, | |
b7058842 | 692 | char __user *optval, unsigned int optlen) |
1da177e4 | 693 | { |
2a91525c | 694 | struct sock *sk = sock->sk; |
1da177e4 LT |
695 | int val; |
696 | int valbool; | |
697 | struct linger ling; | |
698 | int ret = 0; | |
4ec93edb | 699 | |
1da177e4 LT |
700 | /* |
701 | * Options without arguments | |
702 | */ | |
703 | ||
4878809f | 704 | if (optname == SO_BINDTODEVICE) |
c91f6df2 | 705 | return sock_setbindtodevice(sk, optval, optlen); |
4878809f | 706 | |
e71a4783 SH |
707 | if (optlen < sizeof(int)) |
708 | return -EINVAL; | |
4ec93edb | 709 | |
1da177e4 LT |
710 | if (get_user(val, (int __user *)optval)) |
711 | return -EFAULT; | |
4ec93edb | 712 | |
2a91525c | 713 | valbool = val ? 1 : 0; |
1da177e4 LT |
714 | |
715 | lock_sock(sk); | |
716 | ||
2a91525c | 717 | switch (optname) { |
e71a4783 | 718 | case SO_DEBUG: |
2a91525c | 719 | if (val && !capable(CAP_NET_ADMIN)) |
e71a4783 | 720 | ret = -EACCES; |
2a91525c | 721 | else |
c0ef877b | 722 | sock_valbool_flag(sk, SOCK_DBG, valbool); |
e71a4783 SH |
723 | break; |
724 | case SO_REUSEADDR: | |
4a17fd52 | 725 | sk->sk_reuse = (valbool ? SK_CAN_REUSE : SK_NO_REUSE); |
e71a4783 | 726 | break; |
055dc21a TH |
727 | case SO_REUSEPORT: |
728 | sk->sk_reuseport = valbool; | |
729 | break; | |
e71a4783 | 730 | case SO_TYPE: |
49c794e9 | 731 | case SO_PROTOCOL: |
0d6038ee | 732 | case SO_DOMAIN: |
e71a4783 SH |
733 | case SO_ERROR: |
734 | ret = -ENOPROTOOPT; | |
735 | break; | |
736 | case SO_DONTROUTE: | |
c0ef877b | 737 | sock_valbool_flag(sk, SOCK_LOCALROUTE, valbool); |
e1bca2f4 | 738 | sk_dst_reset(sk); |
e71a4783 SH |
739 | break; |
740 | case SO_BROADCAST: | |
741 | sock_valbool_flag(sk, SOCK_BROADCAST, valbool); | |
742 | break; | |
743 | case SO_SNDBUF: | |
744 | /* Don't error on this BSD doesn't and if you think | |
82981930 ED |
745 | * about it this is right. Otherwise apps have to |
746 | * play 'guess the biggest size' games. RCVBUF/SNDBUF | |
747 | * are treated in BSD as hints | |
748 | */ | |
749 | val = min_t(u32, val, sysctl_wmem_max); | |
b0573dea | 750 | set_sndbuf: |
e71a4783 | 751 | sk->sk_userlocks |= SOCK_SNDBUF_LOCK; |
b98b0bc8 | 752 | sk->sk_sndbuf = max_t(int, val * 2, SOCK_MIN_SNDBUF); |
82981930 | 753 | /* Wake up sending tasks if we upped the value. */ |
e71a4783 SH |
754 | sk->sk_write_space(sk); |
755 | break; | |
1da177e4 | 756 | |
e71a4783 SH |
757 | case SO_SNDBUFFORCE: |
758 | if (!capable(CAP_NET_ADMIN)) { | |
759 | ret = -EPERM; | |
760 | break; | |
761 | } | |
762 | goto set_sndbuf; | |
b0573dea | 763 | |
e71a4783 SH |
764 | case SO_RCVBUF: |
765 | /* Don't error on this BSD doesn't and if you think | |
82981930 ED |
766 | * about it this is right. Otherwise apps have to |
767 | * play 'guess the biggest size' games. RCVBUF/SNDBUF | |
768 | * are treated in BSD as hints | |
769 | */ | |
770 | val = min_t(u32, val, sysctl_rmem_max); | |
b0573dea | 771 | set_rcvbuf: |
e71a4783 SH |
772 | sk->sk_userlocks |= SOCK_RCVBUF_LOCK; |
773 | /* | |
774 | * We double it on the way in to account for | |
775 | * "struct sk_buff" etc. overhead. Applications | |
776 | * assume that the SO_RCVBUF setting they make will | |
777 | * allow that much actual data to be received on that | |
778 | * socket. | |
779 | * | |
780 | * Applications are unaware that "struct sk_buff" and | |
781 | * other overheads allocate from the receive buffer | |
782 | * during socket buffer allocation. | |
783 | * | |
784 | * And after considering the possible alternatives, | |
785 | * returning the value we actually used in getsockopt | |
786 | * is the most desirable behavior. | |
787 | */ | |
b98b0bc8 | 788 | sk->sk_rcvbuf = max_t(int, val * 2, SOCK_MIN_RCVBUF); |
e71a4783 SH |
789 | break; |
790 | ||
791 | case SO_RCVBUFFORCE: | |
792 | if (!capable(CAP_NET_ADMIN)) { | |
793 | ret = -EPERM; | |
1da177e4 | 794 | break; |
e71a4783 SH |
795 | } |
796 | goto set_rcvbuf; | |
1da177e4 | 797 | |
e71a4783 | 798 | case SO_KEEPALIVE: |
4b9d07a4 UB |
799 | if (sk->sk_prot->keepalive) |
800 | sk->sk_prot->keepalive(sk, valbool); | |
e71a4783 SH |
801 | sock_valbool_flag(sk, SOCK_KEEPOPEN, valbool); |
802 | break; | |
803 | ||
804 | case SO_OOBINLINE: | |
805 | sock_valbool_flag(sk, SOCK_URGINLINE, valbool); | |
806 | break; | |
807 | ||
808 | case SO_NO_CHECK: | |
28448b80 | 809 | sk->sk_no_check_tx = valbool; |
e71a4783 SH |
810 | break; |
811 | ||
812 | case SO_PRIORITY: | |
5e1fccc0 EB |
813 | if ((val >= 0 && val <= 6) || |
814 | ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN)) | |
e71a4783 SH |
815 | sk->sk_priority = val; |
816 | else | |
817 | ret = -EPERM; | |
818 | break; | |
819 | ||
820 | case SO_LINGER: | |
821 | if (optlen < sizeof(ling)) { | |
822 | ret = -EINVAL; /* 1003.1g */ | |
1da177e4 | 823 | break; |
e71a4783 | 824 | } |
2a91525c | 825 | if (copy_from_user(&ling, optval, sizeof(ling))) { |
e71a4783 | 826 | ret = -EFAULT; |
1da177e4 | 827 | break; |
e71a4783 SH |
828 | } |
829 | if (!ling.l_onoff) | |
830 | sock_reset_flag(sk, SOCK_LINGER); | |
831 | else { | |
1da177e4 | 832 | #if (BITS_PER_LONG == 32) |
e71a4783 SH |
833 | if ((unsigned int)ling.l_linger >= MAX_SCHEDULE_TIMEOUT/HZ) |
834 | sk->sk_lingertime = MAX_SCHEDULE_TIMEOUT; | |
1da177e4 | 835 | else |
e71a4783 SH |
836 | #endif |
837 | sk->sk_lingertime = (unsigned int)ling.l_linger * HZ; | |
838 | sock_set_flag(sk, SOCK_LINGER); | |
839 | } | |
840 | break; | |
841 | ||
842 | case SO_BSDCOMPAT: | |
843 | sock_warn_obsolete_bsdism("setsockopt"); | |
844 | break; | |
845 | ||
846 | case SO_PASSCRED: | |
847 | if (valbool) | |
848 | set_bit(SOCK_PASSCRED, &sock->flags); | |
849 | else | |
850 | clear_bit(SOCK_PASSCRED, &sock->flags); | |
851 | break; | |
852 | ||
853 | case SO_TIMESTAMP: | |
92f37fd2 | 854 | case SO_TIMESTAMPNS: |
e71a4783 | 855 | if (valbool) { |
92f37fd2 ED |
856 | if (optname == SO_TIMESTAMP) |
857 | sock_reset_flag(sk, SOCK_RCVTSTAMPNS); | |
858 | else | |
859 | sock_set_flag(sk, SOCK_RCVTSTAMPNS); | |
e71a4783 | 860 | sock_set_flag(sk, SOCK_RCVTSTAMP); |
20d49473 | 861 | sock_enable_timestamp(sk, SOCK_TIMESTAMP); |
92f37fd2 | 862 | } else { |
e71a4783 | 863 | sock_reset_flag(sk, SOCK_RCVTSTAMP); |
92f37fd2 ED |
864 | sock_reset_flag(sk, SOCK_RCVTSTAMPNS); |
865 | } | |
e71a4783 SH |
866 | break; |
867 | ||
20d49473 PO |
868 | case SO_TIMESTAMPING: |
869 | if (val & ~SOF_TIMESTAMPING_MASK) { | |
f249fb78 | 870 | ret = -EINVAL; |
20d49473 PO |
871 | break; |
872 | } | |
b245be1f | 873 | |
09c2d251 | 874 | if (val & SOF_TIMESTAMPING_OPT_ID && |
4ed2d765 | 875 | !(sk->sk_tsflags & SOF_TIMESTAMPING_OPT_ID)) { |
ac5cc977 WC |
876 | if (sk->sk_protocol == IPPROTO_TCP && |
877 | sk->sk_type == SOCK_STREAM) { | |
6db8b963 SHY |
878 | if ((1 << sk->sk_state) & |
879 | (TCPF_CLOSE | TCPF_LISTEN)) { | |
4ed2d765 WB |
880 | ret = -EINVAL; |
881 | break; | |
882 | } | |
883 | sk->sk_tskey = tcp_sk(sk)->snd_una; | |
884 | } else { | |
885 | sk->sk_tskey = 0; | |
886 | } | |
887 | } | |
1c885808 FY |
888 | |
889 | if (val & SOF_TIMESTAMPING_OPT_STATS && | |
890 | !(val & SOF_TIMESTAMPING_OPT_TSONLY)) { | |
891 | ret = -EINVAL; | |
892 | break; | |
893 | } | |
894 | ||
b9f40e21 | 895 | sk->sk_tsflags = val; |
20d49473 PO |
896 | if (val & SOF_TIMESTAMPING_RX_SOFTWARE) |
897 | sock_enable_timestamp(sk, | |
898 | SOCK_TIMESTAMPING_RX_SOFTWARE); | |
899 | else | |
900 | sock_disable_timestamp(sk, | |
08e29af3 | 901 | (1UL << SOCK_TIMESTAMPING_RX_SOFTWARE)); |
20d49473 PO |
902 | break; |
903 | ||
e71a4783 SH |
904 | case SO_RCVLOWAT: |
905 | if (val < 0) | |
906 | val = INT_MAX; | |
907 | sk->sk_rcvlowat = val ? : 1; | |
908 | break; | |
909 | ||
910 | case SO_RCVTIMEO: | |
911 | ret = sock_set_timeout(&sk->sk_rcvtimeo, optval, optlen); | |
912 | break; | |
913 | ||
914 | case SO_SNDTIMEO: | |
915 | ret = sock_set_timeout(&sk->sk_sndtimeo, optval, optlen); | |
916 | break; | |
1da177e4 | 917 | |
e71a4783 SH |
918 | case SO_ATTACH_FILTER: |
919 | ret = -EINVAL; | |
920 | if (optlen == sizeof(struct sock_fprog)) { | |
921 | struct sock_fprog fprog; | |
1da177e4 | 922 | |
e71a4783 SH |
923 | ret = -EFAULT; |
924 | if (copy_from_user(&fprog, optval, sizeof(fprog))) | |
1da177e4 | 925 | break; |
e71a4783 SH |
926 | |
927 | ret = sk_attach_filter(&fprog, sk); | |
928 | } | |
929 | break; | |
930 | ||
89aa0758 AS |
931 | case SO_ATTACH_BPF: |
932 | ret = -EINVAL; | |
933 | if (optlen == sizeof(u32)) { | |
934 | u32 ufd; | |
935 | ||
936 | ret = -EFAULT; | |
937 | if (copy_from_user(&ufd, optval, sizeof(ufd))) | |
938 | break; | |
939 | ||
940 | ret = sk_attach_bpf(ufd, sk); | |
941 | } | |
942 | break; | |
943 | ||
538950a1 CG |
944 | case SO_ATTACH_REUSEPORT_CBPF: |
945 | ret = -EINVAL; | |
946 | if (optlen == sizeof(struct sock_fprog)) { | |
947 | struct sock_fprog fprog; | |
948 | ||
949 | ret = -EFAULT; | |
950 | if (copy_from_user(&fprog, optval, sizeof(fprog))) | |
951 | break; | |
952 | ||
953 | ret = sk_reuseport_attach_filter(&fprog, sk); | |
954 | } | |
955 | break; | |
956 | ||
957 | case SO_ATTACH_REUSEPORT_EBPF: | |
958 | ret = -EINVAL; | |
959 | if (optlen == sizeof(u32)) { | |
960 | u32 ufd; | |
961 | ||
962 | ret = -EFAULT; | |
963 | if (copy_from_user(&ufd, optval, sizeof(ufd))) | |
964 | break; | |
965 | ||
966 | ret = sk_reuseport_attach_bpf(ufd, sk); | |
967 | } | |
968 | break; | |
969 | ||
e71a4783 | 970 | case SO_DETACH_FILTER: |
55b33325 | 971 | ret = sk_detach_filter(sk); |
e71a4783 | 972 | break; |
1da177e4 | 973 | |
d59577b6 VB |
974 | case SO_LOCK_FILTER: |
975 | if (sock_flag(sk, SOCK_FILTER_LOCKED) && !valbool) | |
976 | ret = -EPERM; | |
977 | else | |
978 | sock_valbool_flag(sk, SOCK_FILTER_LOCKED, valbool); | |
979 | break; | |
980 | ||
e71a4783 SH |
981 | case SO_PASSSEC: |
982 | if (valbool) | |
983 | set_bit(SOCK_PASSSEC, &sock->flags); | |
984 | else | |
985 | clear_bit(SOCK_PASSSEC, &sock->flags); | |
986 | break; | |
4a19ec58 | 987 | case SO_MARK: |
5e1fccc0 | 988 | if (!ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN)) |
4a19ec58 | 989 | ret = -EPERM; |
2a91525c | 990 | else |
4a19ec58 | 991 | sk->sk_mark = val; |
4a19ec58 | 992 | break; |
877ce7c1 | 993 | |
3b885787 | 994 | case SO_RXQ_OVFL: |
8083f0fc | 995 | sock_valbool_flag(sk, SOCK_RXQ_OVFL, valbool); |
3b885787 | 996 | break; |
6e3e939f JB |
997 | |
998 | case SO_WIFI_STATUS: | |
999 | sock_valbool_flag(sk, SOCK_WIFI_STATUS, valbool); | |
1000 | break; | |
1001 | ||
ef64a54f PE |
1002 | case SO_PEEK_OFF: |
1003 | if (sock->ops->set_peek_off) | |
12663bfc | 1004 | ret = sock->ops->set_peek_off(sk, val); |
ef64a54f PE |
1005 | else |
1006 | ret = -EOPNOTSUPP; | |
1007 | break; | |
3bdc0eba BG |
1008 | |
1009 | case SO_NOFCS: | |
1010 | sock_valbool_flag(sk, SOCK_NOFCS, valbool); | |
1011 | break; | |
1012 | ||
7d4c04fc KJ |
1013 | case SO_SELECT_ERR_QUEUE: |
1014 | sock_valbool_flag(sk, SOCK_SELECT_ERR_QUEUE, valbool); | |
1015 | break; | |
1016 | ||
e0d1095a | 1017 | #ifdef CONFIG_NET_RX_BUSY_POLL |
64b0dc51 | 1018 | case SO_BUSY_POLL: |
dafcc438 ET |
1019 | /* allow unprivileged users to decrease the value */ |
1020 | if ((val > sk->sk_ll_usec) && !capable(CAP_NET_ADMIN)) | |
1021 | ret = -EPERM; | |
1022 | else { | |
1023 | if (val < 0) | |
1024 | ret = -EINVAL; | |
1025 | else | |
1026 | sk->sk_ll_usec = val; | |
1027 | } | |
1028 | break; | |
1029 | #endif | |
62748f32 ED |
1030 | |
1031 | case SO_MAX_PACING_RATE: | |
218af599 ED |
1032 | if (val != ~0U) |
1033 | cmpxchg(&sk->sk_pacing_status, | |
1034 | SK_PACING_NONE, | |
1035 | SK_PACING_NEEDED); | |
62748f32 ED |
1036 | sk->sk_max_pacing_rate = val; |
1037 | sk->sk_pacing_rate = min(sk->sk_pacing_rate, | |
1038 | sk->sk_max_pacing_rate); | |
1039 | break; | |
1040 | ||
70da268b ED |
1041 | case SO_INCOMING_CPU: |
1042 | sk->sk_incoming_cpu = val; | |
1043 | break; | |
1044 | ||
a87cb3e4 TH |
1045 | case SO_CNX_ADVICE: |
1046 | if (val == 1) | |
1047 | dst_negative_advice(sk); | |
1048 | break; | |
76851d12 WB |
1049 | |
1050 | case SO_ZEROCOPY: | |
1051 | if (sk->sk_family != PF_INET && sk->sk_family != PF_INET6) | |
1052 | ret = -ENOTSUPP; | |
1053 | else if (sk->sk_protocol != IPPROTO_TCP) | |
1054 | ret = -ENOTSUPP; | |
1055 | else if (sk->sk_state != TCP_CLOSE) | |
1056 | ret = -EBUSY; | |
1057 | else if (val < 0 || val > 1) | |
1058 | ret = -EINVAL; | |
1059 | else | |
1060 | sock_valbool_flag(sk, SOCK_ZEROCOPY, valbool); | |
1061 | break; | |
1062 | ||
e71a4783 SH |
1063 | default: |
1064 | ret = -ENOPROTOOPT; | |
1065 | break; | |
4ec93edb | 1066 | } |
1da177e4 LT |
1067 | release_sock(sk); |
1068 | return ret; | |
1069 | } | |
2a91525c | 1070 | EXPORT_SYMBOL(sock_setsockopt); |
1da177e4 LT |
1071 | |
1072 | ||
8f09898b | 1073 | static void cred_to_ucred(struct pid *pid, const struct cred *cred, |
1074 | struct ucred *ucred) | |
3f551f94 EB |
1075 | { |
1076 | ucred->pid = pid_vnr(pid); | |
1077 | ucred->uid = ucred->gid = -1; | |
1078 | if (cred) { | |
1079 | struct user_namespace *current_ns = current_user_ns(); | |
1080 | ||
b2e4f544 EB |
1081 | ucred->uid = from_kuid_munged(current_ns, cred->euid); |
1082 | ucred->gid = from_kgid_munged(current_ns, cred->egid); | |
3f551f94 EB |
1083 | } |
1084 | } | |
1085 | ||
28b5ba2a DH |
1086 | static int groups_to_user(gid_t __user *dst, const struct group_info *src) |
1087 | { | |
1088 | struct user_namespace *user_ns = current_user_ns(); | |
1089 | int i; | |
1090 | ||
1091 | for (i = 0; i < src->ngroups; i++) | |
1092 | if (put_user(from_kgid_munged(user_ns, src->gid[i]), dst + i)) | |
1093 | return -EFAULT; | |
1094 | ||
1095 | return 0; | |
1096 | } | |
1097 | ||
1da177e4 LT |
1098 | int sock_getsockopt(struct socket *sock, int level, int optname, |
1099 | char __user *optval, int __user *optlen) | |
1100 | { | |
1101 | struct sock *sk = sock->sk; | |
4ec93edb | 1102 | |
e71a4783 | 1103 | union { |
4ec93edb | 1104 | int val; |
5daab9db | 1105 | u64 val64; |
4ec93edb | 1106 | struct linger ling; |
1da177e4 LT |
1107 | struct timeval tm; |
1108 | } v; | |
4ec93edb | 1109 | |
4d0392be | 1110 | int lv = sizeof(int); |
1da177e4 | 1111 | int len; |
4ec93edb | 1112 | |
e71a4783 | 1113 | if (get_user(len, optlen)) |
4ec93edb | 1114 | return -EFAULT; |
e71a4783 | 1115 | if (len < 0) |
1da177e4 | 1116 | return -EINVAL; |
4ec93edb | 1117 | |
50fee1de | 1118 | memset(&v, 0, sizeof(v)); |
df0bca04 | 1119 | |
2a91525c | 1120 | switch (optname) { |
e71a4783 SH |
1121 | case SO_DEBUG: |
1122 | v.val = sock_flag(sk, SOCK_DBG); | |
1123 | break; | |
1124 | ||
1125 | case SO_DONTROUTE: | |
1126 | v.val = sock_flag(sk, SOCK_LOCALROUTE); | |
1127 | break; | |
1128 | ||
1129 | case SO_BROADCAST: | |
1b23a5df | 1130 | v.val = sock_flag(sk, SOCK_BROADCAST); |
e71a4783 SH |
1131 | break; |
1132 | ||
1133 | case SO_SNDBUF: | |
1134 | v.val = sk->sk_sndbuf; | |
1135 | break; | |
1136 | ||
1137 | case SO_RCVBUF: | |
1138 | v.val = sk->sk_rcvbuf; | |
1139 | break; | |
1140 | ||
1141 | case SO_REUSEADDR: | |
1142 | v.val = sk->sk_reuse; | |
1143 | break; | |
1144 | ||
055dc21a TH |
1145 | case SO_REUSEPORT: |
1146 | v.val = sk->sk_reuseport; | |
1147 | break; | |
1148 | ||
e71a4783 | 1149 | case SO_KEEPALIVE: |
1b23a5df | 1150 | v.val = sock_flag(sk, SOCK_KEEPOPEN); |
e71a4783 SH |
1151 | break; |
1152 | ||
1153 | case SO_TYPE: | |
1154 | v.val = sk->sk_type; | |
1155 | break; | |
1156 | ||
49c794e9 JE |
1157 | case SO_PROTOCOL: |
1158 | v.val = sk->sk_protocol; | |
1159 | break; | |
1160 | ||
0d6038ee JE |
1161 | case SO_DOMAIN: |
1162 | v.val = sk->sk_family; | |
1163 | break; | |
1164 | ||
e71a4783 SH |
1165 | case SO_ERROR: |
1166 | v.val = -sock_error(sk); | |
2a91525c | 1167 | if (v.val == 0) |
e71a4783 SH |
1168 | v.val = xchg(&sk->sk_err_soft, 0); |
1169 | break; | |
1170 | ||
1171 | case SO_OOBINLINE: | |
1b23a5df | 1172 | v.val = sock_flag(sk, SOCK_URGINLINE); |
e71a4783 SH |
1173 | break; |
1174 | ||
1175 | case SO_NO_CHECK: | |
28448b80 | 1176 | v.val = sk->sk_no_check_tx; |
e71a4783 SH |
1177 | break; |
1178 | ||
1179 | case SO_PRIORITY: | |
1180 | v.val = sk->sk_priority; | |
1181 | break; | |
1182 | ||
1183 | case SO_LINGER: | |
1184 | lv = sizeof(v.ling); | |
1b23a5df | 1185 | v.ling.l_onoff = sock_flag(sk, SOCK_LINGER); |
e71a4783 SH |
1186 | v.ling.l_linger = sk->sk_lingertime / HZ; |
1187 | break; | |
1188 | ||
1189 | case SO_BSDCOMPAT: | |
1190 | sock_warn_obsolete_bsdism("getsockopt"); | |
1191 | break; | |
1192 | ||
1193 | case SO_TIMESTAMP: | |
92f37fd2 ED |
1194 | v.val = sock_flag(sk, SOCK_RCVTSTAMP) && |
1195 | !sock_flag(sk, SOCK_RCVTSTAMPNS); | |
1196 | break; | |
1197 | ||
1198 | case SO_TIMESTAMPNS: | |
1199 | v.val = sock_flag(sk, SOCK_RCVTSTAMPNS); | |
e71a4783 SH |
1200 | break; |
1201 | ||
20d49473 | 1202 | case SO_TIMESTAMPING: |
b9f40e21 | 1203 | v.val = sk->sk_tsflags; |
20d49473 PO |
1204 | break; |
1205 | ||
e71a4783 | 1206 | case SO_RCVTIMEO: |
2a91525c | 1207 | lv = sizeof(struct timeval); |
e71a4783 SH |
1208 | if (sk->sk_rcvtimeo == MAX_SCHEDULE_TIMEOUT) { |
1209 | v.tm.tv_sec = 0; | |
1210 | v.tm.tv_usec = 0; | |
1211 | } else { | |
1212 | v.tm.tv_sec = sk->sk_rcvtimeo / HZ; | |
8ccde4c5 | 1213 | v.tm.tv_usec = ((sk->sk_rcvtimeo % HZ) * USEC_PER_SEC) / HZ; |
e71a4783 SH |
1214 | } |
1215 | break; | |
1216 | ||
1217 | case SO_SNDTIMEO: | |
2a91525c | 1218 | lv = sizeof(struct timeval); |
e71a4783 SH |
1219 | if (sk->sk_sndtimeo == MAX_SCHEDULE_TIMEOUT) { |
1220 | v.tm.tv_sec = 0; | |
1221 | v.tm.tv_usec = 0; | |
1222 | } else { | |
1223 | v.tm.tv_sec = sk->sk_sndtimeo / HZ; | |
8ccde4c5 | 1224 | v.tm.tv_usec = ((sk->sk_sndtimeo % HZ) * USEC_PER_SEC) / HZ; |
e71a4783 SH |
1225 | } |
1226 | break; | |
1da177e4 | 1227 | |
e71a4783 SH |
1228 | case SO_RCVLOWAT: |
1229 | v.val = sk->sk_rcvlowat; | |
1230 | break; | |
1da177e4 | 1231 | |
e71a4783 | 1232 | case SO_SNDLOWAT: |
2a91525c | 1233 | v.val = 1; |
e71a4783 | 1234 | break; |
1da177e4 | 1235 | |
e71a4783 | 1236 | case SO_PASSCRED: |
82981930 | 1237 | v.val = !!test_bit(SOCK_PASSCRED, &sock->flags); |
e71a4783 | 1238 | break; |
1da177e4 | 1239 | |
e71a4783 | 1240 | case SO_PEERCRED: |
109f6e39 EB |
1241 | { |
1242 | struct ucred peercred; | |
1243 | if (len > sizeof(peercred)) | |
1244 | len = sizeof(peercred); | |
1245 | cred_to_ucred(sk->sk_peer_pid, sk->sk_peer_cred, &peercred); | |
1246 | if (copy_to_user(optval, &peercred, len)) | |
e71a4783 SH |
1247 | return -EFAULT; |
1248 | goto lenout; | |
109f6e39 | 1249 | } |
1da177e4 | 1250 | |
28b5ba2a DH |
1251 | case SO_PEERGROUPS: |
1252 | { | |
1253 | int ret, n; | |
1254 | ||
1255 | if (!sk->sk_peer_cred) | |
1256 | return -ENODATA; | |
1257 | ||
1258 | n = sk->sk_peer_cred->group_info->ngroups; | |
1259 | if (len < n * sizeof(gid_t)) { | |
1260 | len = n * sizeof(gid_t); | |
1261 | return put_user(len, optlen) ? -EFAULT : -ERANGE; | |
1262 | } | |
1263 | len = n * sizeof(gid_t); | |
1264 | ||
1265 | ret = groups_to_user((gid_t __user *)optval, | |
1266 | sk->sk_peer_cred->group_info); | |
1267 | if (ret) | |
1268 | return ret; | |
1269 | goto lenout; | |
1270 | } | |
1271 | ||
e71a4783 SH |
1272 | case SO_PEERNAME: |
1273 | { | |
1274 | char address[128]; | |
1275 | ||
1276 | if (sock->ops->getname(sock, (struct sockaddr *)address, &lv, 2)) | |
1277 | return -ENOTCONN; | |
1278 | if (lv < len) | |
1279 | return -EINVAL; | |
1280 | if (copy_to_user(optval, address, len)) | |
1281 | return -EFAULT; | |
1282 | goto lenout; | |
1283 | } | |
1da177e4 | 1284 | |
e71a4783 SH |
1285 | /* Dubious BSD thing... Probably nobody even uses it, but |
1286 | * the UNIX standard wants it for whatever reason... -DaveM | |
1287 | */ | |
1288 | case SO_ACCEPTCONN: | |
1289 | v.val = sk->sk_state == TCP_LISTEN; | |
1290 | break; | |
1da177e4 | 1291 | |
e71a4783 | 1292 | case SO_PASSSEC: |
82981930 | 1293 | v.val = !!test_bit(SOCK_PASSSEC, &sock->flags); |
e71a4783 | 1294 | break; |
877ce7c1 | 1295 | |
e71a4783 SH |
1296 | case SO_PEERSEC: |
1297 | return security_socket_getpeersec_stream(sock, optval, optlen, len); | |
1da177e4 | 1298 | |
4a19ec58 LAT |
1299 | case SO_MARK: |
1300 | v.val = sk->sk_mark; | |
1301 | break; | |
1302 | ||
3b885787 | 1303 | case SO_RXQ_OVFL: |
1b23a5df | 1304 | v.val = sock_flag(sk, SOCK_RXQ_OVFL); |
3b885787 NH |
1305 | break; |
1306 | ||
6e3e939f | 1307 | case SO_WIFI_STATUS: |
1b23a5df | 1308 | v.val = sock_flag(sk, SOCK_WIFI_STATUS); |
6e3e939f JB |
1309 | break; |
1310 | ||
ef64a54f PE |
1311 | case SO_PEEK_OFF: |
1312 | if (!sock->ops->set_peek_off) | |
1313 | return -EOPNOTSUPP; | |
1314 | ||
1315 | v.val = sk->sk_peek_off; | |
1316 | break; | |
bc2f7996 | 1317 | case SO_NOFCS: |
1b23a5df | 1318 | v.val = sock_flag(sk, SOCK_NOFCS); |
bc2f7996 | 1319 | break; |
c91f6df2 | 1320 | |
f7b86bfe | 1321 | case SO_BINDTODEVICE: |
c91f6df2 BH |
1322 | return sock_getbindtodevice(sk, optval, optlen, len); |
1323 | ||
a8fc9277 PE |
1324 | case SO_GET_FILTER: |
1325 | len = sk_get_filter(sk, (struct sock_filter __user *)optval, len); | |
1326 | if (len < 0) | |
1327 | return len; | |
1328 | ||
1329 | goto lenout; | |
c91f6df2 | 1330 | |
d59577b6 VB |
1331 | case SO_LOCK_FILTER: |
1332 | v.val = sock_flag(sk, SOCK_FILTER_LOCKED); | |
1333 | break; | |
1334 | ||
ea02f941 MS |
1335 | case SO_BPF_EXTENSIONS: |
1336 | v.val = bpf_tell_extensions(); | |
1337 | break; | |
1338 | ||
7d4c04fc KJ |
1339 | case SO_SELECT_ERR_QUEUE: |
1340 | v.val = sock_flag(sk, SOCK_SELECT_ERR_QUEUE); | |
1341 | break; | |
1342 | ||
e0d1095a | 1343 | #ifdef CONFIG_NET_RX_BUSY_POLL |
64b0dc51 | 1344 | case SO_BUSY_POLL: |
dafcc438 ET |
1345 | v.val = sk->sk_ll_usec; |
1346 | break; | |
1347 | #endif | |
1348 | ||
62748f32 ED |
1349 | case SO_MAX_PACING_RATE: |
1350 | v.val = sk->sk_max_pacing_rate; | |
1351 | break; | |
1352 | ||
2c8c56e1 ED |
1353 | case SO_INCOMING_CPU: |
1354 | v.val = sk->sk_incoming_cpu; | |
1355 | break; | |
1356 | ||
a2d133b1 JH |
1357 | case SO_MEMINFO: |
1358 | { | |
1359 | u32 meminfo[SK_MEMINFO_VARS]; | |
1360 | ||
1361 | if (get_user(len, optlen)) | |
1362 | return -EFAULT; | |
1363 | ||
1364 | sk_get_meminfo(sk, meminfo); | |
1365 | ||
1366 | len = min_t(unsigned int, len, sizeof(meminfo)); | |
1367 | if (copy_to_user(optval, &meminfo, len)) | |
1368 | return -EFAULT; | |
1369 | ||
1370 | goto lenout; | |
1371 | } | |
6d433902 SS |
1372 | |
1373 | #ifdef CONFIG_NET_RX_BUSY_POLL | |
1374 | case SO_INCOMING_NAPI_ID: | |
1375 | v.val = READ_ONCE(sk->sk_napi_id); | |
1376 | ||
1377 | /* aggregate non-NAPI IDs down to 0 */ | |
1378 | if (v.val < MIN_NAPI_ID) | |
1379 | v.val = 0; | |
1380 | ||
1381 | break; | |
1382 | #endif | |
1383 | ||
5daab9db CF |
1384 | case SO_COOKIE: |
1385 | lv = sizeof(u64); | |
1386 | if (len < lv) | |
1387 | return -EINVAL; | |
1388 | v.val64 = sock_gen_cookie(sk); | |
1389 | break; | |
1390 | ||
76851d12 WB |
1391 | case SO_ZEROCOPY: |
1392 | v.val = sock_flag(sk, SOCK_ZEROCOPY); | |
1393 | break; | |
1394 | ||
e71a4783 | 1395 | default: |
443b5991 YH |
1396 | /* We implement the SO_SNDLOWAT etc to not be settable |
1397 | * (1003.1g 7). | |
1398 | */ | |
e71a4783 | 1399 | return -ENOPROTOOPT; |
1da177e4 | 1400 | } |
e71a4783 | 1401 | |
1da177e4 LT |
1402 | if (len > lv) |
1403 | len = lv; | |
1404 | if (copy_to_user(optval, &v, len)) | |
1405 | return -EFAULT; | |
1406 | lenout: | |
4ec93edb YH |
1407 | if (put_user(len, optlen)) |
1408 | return -EFAULT; | |
1409 | return 0; | |
1da177e4 LT |
1410 | } |
1411 | ||
a5b5bb9a IM |
1412 | /* |
1413 | * Initialize an sk_lock. | |
1414 | * | |
1415 | * (We also register the sk_lock with the lock validator.) | |
1416 | */ | |
b6f99a21 | 1417 | static inline void sock_lock_init(struct sock *sk) |
a5b5bb9a | 1418 | { |
cdfbabfb DH |
1419 | if (sk->sk_kern_sock) |
1420 | sock_lock_init_class_and_name( | |
1421 | sk, | |
1422 | af_family_kern_slock_key_strings[sk->sk_family], | |
1423 | af_family_kern_slock_keys + sk->sk_family, | |
1424 | af_family_kern_key_strings[sk->sk_family], | |
1425 | af_family_kern_keys + sk->sk_family); | |
1426 | else | |
1427 | sock_lock_init_class_and_name( | |
1428 | sk, | |
ed07536e PZ |
1429 | af_family_slock_key_strings[sk->sk_family], |
1430 | af_family_slock_keys + sk->sk_family, | |
1431 | af_family_key_strings[sk->sk_family], | |
1432 | af_family_keys + sk->sk_family); | |
a5b5bb9a IM |
1433 | } |
1434 | ||
4dc6dc71 ED |
1435 | /* |
1436 | * Copy all fields from osk to nsk but nsk->sk_refcnt must not change yet, | |
1437 | * even temporarly, because of RCU lookups. sk_node should also be left as is. | |
68835aba | 1438 | * We must not copy fields between sk_dontcopy_begin and sk_dontcopy_end |
4dc6dc71 | 1439 | */ |
f1a6c4da PE |
1440 | static void sock_copy(struct sock *nsk, const struct sock *osk) |
1441 | { | |
1442 | #ifdef CONFIG_SECURITY_NETWORK | |
1443 | void *sptr = nsk->sk_security; | |
1444 | #endif | |
68835aba ED |
1445 | memcpy(nsk, osk, offsetof(struct sock, sk_dontcopy_begin)); |
1446 | ||
1447 | memcpy(&nsk->sk_dontcopy_end, &osk->sk_dontcopy_end, | |
1448 | osk->sk_prot->obj_size - offsetof(struct sock, sk_dontcopy_end)); | |
1449 | ||
f1a6c4da PE |
1450 | #ifdef CONFIG_SECURITY_NETWORK |
1451 | nsk->sk_security = sptr; | |
1452 | security_sk_clone(osk, nsk); | |
1453 | #endif | |
1454 | } | |
1455 | ||
2e4afe7b PE |
1456 | static struct sock *sk_prot_alloc(struct proto *prot, gfp_t priority, |
1457 | int family) | |
c308c1b2 PE |
1458 | { |
1459 | struct sock *sk; | |
1460 | struct kmem_cache *slab; | |
1461 | ||
1462 | slab = prot->slab; | |
e912b114 ED |
1463 | if (slab != NULL) { |
1464 | sk = kmem_cache_alloc(slab, priority & ~__GFP_ZERO); | |
1465 | if (!sk) | |
1466 | return sk; | |
ba2489b0 ED |
1467 | if (priority & __GFP_ZERO) |
1468 | sk_prot_clear_nulls(sk, prot->obj_size); | |
fcbdf09d | 1469 | } else |
c308c1b2 PE |
1470 | sk = kmalloc(prot->obj_size, priority); |
1471 | ||
2e4afe7b PE |
1472 | if (sk != NULL) { |
1473 | if (security_sk_alloc(sk, family, priority)) | |
1474 | goto out_free; | |
1475 | ||
1476 | if (!try_module_get(prot->owner)) | |
1477 | goto out_free_sec; | |
e022f0b4 | 1478 | sk_tx_queue_clear(sk); |
2e4afe7b PE |
1479 | } |
1480 | ||
c308c1b2 | 1481 | return sk; |
2e4afe7b PE |
1482 | |
1483 | out_free_sec: | |
1484 | security_sk_free(sk); | |
1485 | out_free: | |
1486 | if (slab != NULL) | |
1487 | kmem_cache_free(slab, sk); | |
1488 | else | |
1489 | kfree(sk); | |
1490 | return NULL; | |
c308c1b2 PE |
1491 | } |
1492 | ||
1493 | static void sk_prot_free(struct proto *prot, struct sock *sk) | |
1494 | { | |
1495 | struct kmem_cache *slab; | |
2e4afe7b | 1496 | struct module *owner; |
c308c1b2 | 1497 | |
2e4afe7b | 1498 | owner = prot->owner; |
c308c1b2 | 1499 | slab = prot->slab; |
2e4afe7b | 1500 | |
bd1060a1 | 1501 | cgroup_sk_free(&sk->sk_cgrp_data); |
2d758073 | 1502 | mem_cgroup_sk_free(sk); |
2e4afe7b | 1503 | security_sk_free(sk); |
c308c1b2 PE |
1504 | if (slab != NULL) |
1505 | kmem_cache_free(slab, sk); | |
1506 | else | |
1507 | kfree(sk); | |
2e4afe7b | 1508 | module_put(owner); |
c308c1b2 PE |
1509 | } |
1510 | ||
1da177e4 LT |
1511 | /** |
1512 | * sk_alloc - All socket objects are allocated here | |
c4ea43c5 | 1513 | * @net: the applicable net namespace |
4dc3b16b PP |
1514 | * @family: protocol family |
1515 | * @priority: for allocation (%GFP_KERNEL, %GFP_ATOMIC, etc) | |
1516 | * @prot: struct proto associated with this new sock instance | |
11aa9c28 | 1517 | * @kern: is this to be a kernel socket? |
1da177e4 | 1518 | */ |
1b8d7ae4 | 1519 | struct sock *sk_alloc(struct net *net, int family, gfp_t priority, |
11aa9c28 | 1520 | struct proto *prot, int kern) |
1da177e4 | 1521 | { |
c308c1b2 | 1522 | struct sock *sk; |
1da177e4 | 1523 | |
154adbc8 | 1524 | sk = sk_prot_alloc(prot, priority | __GFP_ZERO, family); |
1da177e4 | 1525 | if (sk) { |
154adbc8 PE |
1526 | sk->sk_family = family; |
1527 | /* | |
1528 | * See comment in struct sock definition to understand | |
1529 | * why we need sk_prot_creator -acme | |
1530 | */ | |
1531 | sk->sk_prot = sk->sk_prot_creator = prot; | |
cdfbabfb | 1532 | sk->sk_kern_sock = kern; |
154adbc8 | 1533 | sock_lock_init(sk); |
26abe143 EB |
1534 | sk->sk_net_refcnt = kern ? 0 : 1; |
1535 | if (likely(sk->sk_net_refcnt)) | |
1536 | get_net(net); | |
1537 | sock_net_set(sk, net); | |
14afee4b | 1538 | refcount_set(&sk->sk_wmem_alloc, 1); |
f8451725 | 1539 | |
2d758073 | 1540 | mem_cgroup_sk_alloc(sk); |
d979a39d | 1541 | cgroup_sk_alloc(&sk->sk_cgrp_data); |
2a56a1fe TH |
1542 | sock_update_classid(&sk->sk_cgrp_data); |
1543 | sock_update_netprioidx(&sk->sk_cgrp_data); | |
1da177e4 | 1544 | } |
a79af59e | 1545 | |
2e4afe7b | 1546 | return sk; |
1da177e4 | 1547 | } |
2a91525c | 1548 | EXPORT_SYMBOL(sk_alloc); |
1da177e4 | 1549 | |
a4298e45 ED |
1550 | /* Sockets having SOCK_RCU_FREE will call this function after one RCU |
1551 | * grace period. This is the case for UDP sockets and TCP listeners. | |
1552 | */ | |
1553 | static void __sk_destruct(struct rcu_head *head) | |
1da177e4 | 1554 | { |
a4298e45 | 1555 | struct sock *sk = container_of(head, struct sock, sk_rcu); |
1da177e4 | 1556 | struct sk_filter *filter; |
1da177e4 LT |
1557 | |
1558 | if (sk->sk_destruct) | |
1559 | sk->sk_destruct(sk); | |
1560 | ||
a898def2 | 1561 | filter = rcu_dereference_check(sk->sk_filter, |
14afee4b | 1562 | refcount_read(&sk->sk_wmem_alloc) == 0); |
1da177e4 | 1563 | if (filter) { |
309dd5fc | 1564 | sk_filter_uncharge(sk, filter); |
a9b3cd7f | 1565 | RCU_INIT_POINTER(sk->sk_filter, NULL); |
1da177e4 | 1566 | } |
538950a1 CG |
1567 | if (rcu_access_pointer(sk->sk_reuseport_cb)) |
1568 | reuseport_detach_sock(sk); | |
1da177e4 | 1569 | |
08e29af3 | 1570 | sock_disable_timestamp(sk, SK_FLAGS_TIMESTAMP); |
1da177e4 LT |
1571 | |
1572 | if (atomic_read(&sk->sk_omem_alloc)) | |
e005d193 JP |
1573 | pr_debug("%s: optmem leakage (%d bytes) detected\n", |
1574 | __func__, atomic_read(&sk->sk_omem_alloc)); | |
1da177e4 | 1575 | |
22a0e18e ED |
1576 | if (sk->sk_frag.page) { |
1577 | put_page(sk->sk_frag.page); | |
1578 | sk->sk_frag.page = NULL; | |
1579 | } | |
1580 | ||
109f6e39 EB |
1581 | if (sk->sk_peer_cred) |
1582 | put_cred(sk->sk_peer_cred); | |
1583 | put_pid(sk->sk_peer_pid); | |
26abe143 EB |
1584 | if (likely(sk->sk_net_refcnt)) |
1585 | put_net(sock_net(sk)); | |
c308c1b2 | 1586 | sk_prot_free(sk->sk_prot_creator, sk); |
1da177e4 | 1587 | } |
2b85a34e | 1588 | |
a4298e45 ED |
1589 | void sk_destruct(struct sock *sk) |
1590 | { | |
1591 | if (sock_flag(sk, SOCK_RCU_FREE)) | |
1592 | call_rcu(&sk->sk_rcu, __sk_destruct); | |
1593 | else | |
1594 | __sk_destruct(&sk->sk_rcu); | |
1595 | } | |
1596 | ||
eb4cb008 CG |
1597 | static void __sk_free(struct sock *sk) |
1598 | { | |
edabcd0f | 1599 | if (unlikely(sk->sk_net_refcnt && sock_diag_has_destroy_listeners(sk))) |
eb4cb008 CG |
1600 | sock_diag_broadcast_destroy(sk); |
1601 | else | |
1602 | sk_destruct(sk); | |
1603 | } | |
1604 | ||
2b85a34e ED |
1605 | void sk_free(struct sock *sk) |
1606 | { | |
1607 | /* | |
25985edc | 1608 | * We subtract one from sk_wmem_alloc and can know if |
2b85a34e ED |
1609 | * some packets are still in some tx queue. |
1610 | * If not null, sock_wfree() will call __sk_free(sk) later | |
1611 | */ | |
14afee4b | 1612 | if (refcount_dec_and_test(&sk->sk_wmem_alloc)) |
2b85a34e ED |
1613 | __sk_free(sk); |
1614 | } | |
2a91525c | 1615 | EXPORT_SYMBOL(sk_free); |
1da177e4 | 1616 | |
581319c5 PA |
1617 | static void sk_init_common(struct sock *sk) |
1618 | { | |
1619 | skb_queue_head_init(&sk->sk_receive_queue); | |
1620 | skb_queue_head_init(&sk->sk_write_queue); | |
1621 | skb_queue_head_init(&sk->sk_error_queue); | |
1622 | ||
1623 | rwlock_init(&sk->sk_callback_lock); | |
1624 | lockdep_set_class_and_name(&sk->sk_receive_queue.lock, | |
1625 | af_rlock_keys + sk->sk_family, | |
1626 | af_family_rlock_key_strings[sk->sk_family]); | |
1627 | lockdep_set_class_and_name(&sk->sk_write_queue.lock, | |
1628 | af_wlock_keys + sk->sk_family, | |
1629 | af_family_wlock_key_strings[sk->sk_family]); | |
1630 | lockdep_set_class_and_name(&sk->sk_error_queue.lock, | |
1631 | af_elock_keys + sk->sk_family, | |
1632 | af_family_elock_key_strings[sk->sk_family]); | |
1633 | lockdep_set_class_and_name(&sk->sk_callback_lock, | |
1634 | af_callback_keys + sk->sk_family, | |
1635 | af_family_clock_key_strings[sk->sk_family]); | |
1636 | } | |
1637 | ||
e56c57d0 ED |
1638 | /** |
1639 | * sk_clone_lock - clone a socket, and lock its clone | |
1640 | * @sk: the socket to clone | |
1641 | * @priority: for allocation (%GFP_KERNEL, %GFP_ATOMIC, etc) | |
1642 | * | |
1643 | * Caller must unlock socket even in error path (bh_unlock_sock(newsk)) | |
1644 | */ | |
1645 | struct sock *sk_clone_lock(const struct sock *sk, const gfp_t priority) | |
87d11ceb | 1646 | { |
8fd1d178 | 1647 | struct sock *newsk; |
278571ba | 1648 | bool is_charged = true; |
87d11ceb | 1649 | |
8fd1d178 | 1650 | newsk = sk_prot_alloc(sk->sk_prot, priority, sk->sk_family); |
87d11ceb ACM |
1651 | if (newsk != NULL) { |
1652 | struct sk_filter *filter; | |
1653 | ||
892c141e | 1654 | sock_copy(newsk, sk); |
87d11ceb | 1655 | |
9d538fa6 CP |
1656 | newsk->sk_prot_creator = sk->sk_prot; |
1657 | ||
87d11ceb | 1658 | /* SANITY */ |
8a681736 SV |
1659 | if (likely(newsk->sk_net_refcnt)) |
1660 | get_net(sock_net(newsk)); | |
87d11ceb ACM |
1661 | sk_node_init(&newsk->sk_node); |
1662 | sock_lock_init(newsk); | |
1663 | bh_lock_sock(newsk); | |
fa438ccf | 1664 | newsk->sk_backlog.head = newsk->sk_backlog.tail = NULL; |
8eae939f | 1665 | newsk->sk_backlog.len = 0; |
87d11ceb ACM |
1666 | |
1667 | atomic_set(&newsk->sk_rmem_alloc, 0); | |
2b85a34e ED |
1668 | /* |
1669 | * sk_wmem_alloc set to one (see sk_free() and sock_wfree()) | |
1670 | */ | |
14afee4b | 1671 | refcount_set(&newsk->sk_wmem_alloc, 1); |
87d11ceb | 1672 | atomic_set(&newsk->sk_omem_alloc, 0); |
581319c5 | 1673 | sk_init_common(newsk); |
87d11ceb ACM |
1674 | |
1675 | newsk->sk_dst_cache = NULL; | |
9b8805a3 | 1676 | newsk->sk_dst_pending_confirm = 0; |
87d11ceb ACM |
1677 | newsk->sk_wmem_queued = 0; |
1678 | newsk->sk_forward_alloc = 0; | |
9caad864 | 1679 | atomic_set(&newsk->sk_drops, 0); |
87d11ceb | 1680 | newsk->sk_send_head = NULL; |
87d11ceb | 1681 | newsk->sk_userlocks = sk->sk_userlocks & ~SOCK_BINDPORT_LOCK; |
52267790 | 1682 | atomic_set(&newsk->sk_zckey, 0); |
87d11ceb ACM |
1683 | |
1684 | sock_reset_flag(newsk, SOCK_DONE); | |
799a34d5 | 1685 | mem_cgroup_sk_alloc(newsk); |
c0576e39 | 1686 | cgroup_sk_alloc(&newsk->sk_cgrp_data); |
87d11ceb | 1687 | |
eefca20e ED |
1688 | rcu_read_lock(); |
1689 | filter = rcu_dereference(sk->sk_filter); | |
87d11ceb | 1690 | if (filter != NULL) |
278571ba AS |
1691 | /* though it's an empty new sock, the charging may fail |
1692 | * if sysctl_optmem_max was changed between creation of | |
1693 | * original socket and cloning | |
1694 | */ | |
1695 | is_charged = sk_filter_charge(newsk, filter); | |
eefca20e ED |
1696 | RCU_INIT_POINTER(newsk->sk_filter, filter); |
1697 | rcu_read_unlock(); | |
87d11ceb | 1698 | |
d188ba86 | 1699 | if (unlikely(!is_charged || xfrm_sk_clone_policy(newsk, sk))) { |
a97e50cc DB |
1700 | /* We need to make sure that we don't uncharge the new |
1701 | * socket if we couldn't charge it in the first place | |
1702 | * as otherwise we uncharge the parent's filter. | |
1703 | */ | |
1704 | if (!is_charged) | |
1705 | RCU_INIT_POINTER(newsk->sk_filter, NULL); | |
94352d45 | 1706 | sk_free_unlock_clone(newsk); |
87d11ceb ACM |
1707 | newsk = NULL; |
1708 | goto out; | |
1709 | } | |
fa463497 | 1710 | RCU_INIT_POINTER(newsk->sk_reuseport_cb, NULL); |
87d11ceb ACM |
1711 | |
1712 | newsk->sk_err = 0; | |
e551c32d | 1713 | newsk->sk_err_soft = 0; |
87d11ceb | 1714 | newsk->sk_priority = 0; |
2c8c56e1 | 1715 | newsk->sk_incoming_cpu = raw_smp_processor_id(); |
33cf7c90 | 1716 | atomic64_set(&newsk->sk_cookie, 0); |
d979a39d | 1717 | |
4dc6dc71 ED |
1718 | /* |
1719 | * Before updating sk_refcnt, we must commit prior changes to memory | |
1720 | * (Documentation/RCU/rculist_nulls.txt for details) | |
1721 | */ | |
1722 | smp_wmb(); | |
41c6d650 | 1723 | refcount_set(&newsk->sk_refcnt, 2); |
87d11ceb ACM |
1724 | |
1725 | /* | |
1726 | * Increment the counter in the same struct proto as the master | |
1727 | * sock (sk_refcnt_debug_inc uses newsk->sk_prot->socks, that | |
1728 | * is the same as sk->sk_prot->socks, as this field was copied | |
1729 | * with memcpy). | |
1730 | * | |
1731 | * This _changes_ the previous behaviour, where | |
1732 | * tcp_create_openreq_child always was incrementing the | |
1733 | * equivalent to tcp_prot->socks (inet_sock_nr), so this have | |
1734 | * to be taken into account in all callers. -acme | |
1735 | */ | |
1736 | sk_refcnt_debug_inc(newsk); | |
972692e0 | 1737 | sk_set_socket(newsk, NULL); |
43815482 | 1738 | newsk->sk_wq = NULL; |
87d11ceb ACM |
1739 | |
1740 | if (newsk->sk_prot->sockets_allocated) | |
180d8cd9 | 1741 | sk_sockets_allocated_inc(newsk); |
704da560 | 1742 | |
080a270f HFS |
1743 | if (sock_needs_netstamp(sk) && |
1744 | newsk->sk_flags & SK_FLAGS_TIMESTAMP) | |
704da560 | 1745 | net_enable_timestamp(); |
87d11ceb ACM |
1746 | } |
1747 | out: | |
1748 | return newsk; | |
1749 | } | |
e56c57d0 | 1750 | EXPORT_SYMBOL_GPL(sk_clone_lock); |
87d11ceb | 1751 | |
94352d45 ACM |
1752 | void sk_free_unlock_clone(struct sock *sk) |
1753 | { | |
1754 | /* It is still raw copy of parent, so invalidate | |
1755 | * destructor and make plain sk_free() */ | |
1756 | sk->sk_destruct = NULL; | |
1757 | bh_unlock_sock(sk); | |
1758 | sk_free(sk); | |
1759 | } | |
1760 | EXPORT_SYMBOL_GPL(sk_free_unlock_clone); | |
1761 | ||
9958089a AK |
1762 | void sk_setup_caps(struct sock *sk, struct dst_entry *dst) |
1763 | { | |
d6a4e26a ED |
1764 | u32 max_segs = 1; |
1765 | ||
6bd4f355 | 1766 | sk_dst_set(sk, dst); |
9958089a AK |
1767 | sk->sk_route_caps = dst->dev->features; |
1768 | if (sk->sk_route_caps & NETIF_F_GSO) | |
4fcd6b99 | 1769 | sk->sk_route_caps |= NETIF_F_GSO_SOFTWARE; |
a465419b | 1770 | sk->sk_route_caps &= ~sk->sk_route_nocaps; |
9958089a | 1771 | if (sk_can_gso(sk)) { |
f70f250a | 1772 | if (dst->header_len && !xfrm_dst_offload_ok(dst)) { |
9958089a | 1773 | sk->sk_route_caps &= ~NETIF_F_GSO_MASK; |
82cc1a7a | 1774 | } else { |
9958089a | 1775 | sk->sk_route_caps |= NETIF_F_SG | NETIF_F_HW_CSUM; |
82cc1a7a | 1776 | sk->sk_gso_max_size = dst->dev->gso_max_size; |
d6a4e26a | 1777 | max_segs = max_t(u32, dst->dev->gso_max_segs, 1); |
82cc1a7a | 1778 | } |
9958089a | 1779 | } |
d6a4e26a | 1780 | sk->sk_gso_max_segs = max_segs; |
9958089a AK |
1781 | } |
1782 | EXPORT_SYMBOL_GPL(sk_setup_caps); | |
1783 | ||
1da177e4 LT |
1784 | /* |
1785 | * Simple resource managers for sockets. | |
1786 | */ | |
1787 | ||
1788 | ||
4ec93edb YH |
1789 | /* |
1790 | * Write buffer destructor automatically called from kfree_skb. | |
1da177e4 LT |
1791 | */ |
1792 | void sock_wfree(struct sk_buff *skb) | |
1793 | { | |
1794 | struct sock *sk = skb->sk; | |
d99927f4 | 1795 | unsigned int len = skb->truesize; |
1da177e4 | 1796 | |
d99927f4 ED |
1797 | if (!sock_flag(sk, SOCK_USE_WRITE_QUEUE)) { |
1798 | /* | |
1799 | * Keep a reference on sk_wmem_alloc, this will be released | |
1800 | * after sk_write_space() call | |
1801 | */ | |
14afee4b | 1802 | WARN_ON(refcount_sub_and_test(len - 1, &sk->sk_wmem_alloc)); |
1da177e4 | 1803 | sk->sk_write_space(sk); |
d99927f4 ED |
1804 | len = 1; |
1805 | } | |
2b85a34e | 1806 | /* |
d99927f4 ED |
1807 | * if sk_wmem_alloc reaches 0, we must finish what sk_free() |
1808 | * could not do because of in-flight packets | |
2b85a34e | 1809 | */ |
14afee4b | 1810 | if (refcount_sub_and_test(len, &sk->sk_wmem_alloc)) |
2b85a34e | 1811 | __sk_free(sk); |
1da177e4 | 1812 | } |
2a91525c | 1813 | EXPORT_SYMBOL(sock_wfree); |
1da177e4 | 1814 | |
1d2077ac ED |
1815 | /* This variant of sock_wfree() is used by TCP, |
1816 | * since it sets SOCK_USE_WRITE_QUEUE. | |
1817 | */ | |
1818 | void __sock_wfree(struct sk_buff *skb) | |
1819 | { | |
1820 | struct sock *sk = skb->sk; | |
1821 | ||
14afee4b | 1822 | if (refcount_sub_and_test(skb->truesize, &sk->sk_wmem_alloc)) |
1d2077ac ED |
1823 | __sk_free(sk); |
1824 | } | |
1825 | ||
9e17f8a4 ED |
1826 | void skb_set_owner_w(struct sk_buff *skb, struct sock *sk) |
1827 | { | |
1828 | skb_orphan(skb); | |
1829 | skb->sk = sk; | |
1830 | #ifdef CONFIG_INET | |
1831 | if (unlikely(!sk_fullsock(sk))) { | |
1832 | skb->destructor = sock_edemux; | |
1833 | sock_hold(sk); | |
1834 | return; | |
1835 | } | |
1836 | #endif | |
1837 | skb->destructor = sock_wfree; | |
1838 | skb_set_hash_from_sk(skb, sk); | |
1839 | /* | |
1840 | * We used to take a refcount on sk, but following operation | |
1841 | * is enough to guarantee sk_free() wont free this sock until | |
1842 | * all in-flight packets are completed | |
1843 | */ | |
14afee4b | 1844 | refcount_add(skb->truesize, &sk->sk_wmem_alloc); |
9e17f8a4 ED |
1845 | } |
1846 | EXPORT_SYMBOL(skb_set_owner_w); | |
1847 | ||
1d2077ac ED |
1848 | /* This helper is used by netem, as it can hold packets in its |
1849 | * delay queue. We want to allow the owner socket to send more | |
1850 | * packets, as if they were already TX completed by a typical driver. | |
1851 | * But we also want to keep skb->sk set because some packet schedulers | |
f6ba8d33 | 1852 | * rely on it (sch_fq for example). |
1d2077ac | 1853 | */ |
f2f872f9 ED |
1854 | void skb_orphan_partial(struct sk_buff *skb) |
1855 | { | |
f6ba8d33 | 1856 | if (skb_is_tcp_pure_ack(skb)) |
1d2077ac ED |
1857 | return; |
1858 | ||
f2f872f9 ED |
1859 | if (skb->destructor == sock_wfree |
1860 | #ifdef CONFIG_INET | |
1861 | || skb->destructor == tcp_wfree | |
1862 | #endif | |
1863 | ) { | |
f6ba8d33 ED |
1864 | struct sock *sk = skb->sk; |
1865 | ||
41c6d650 | 1866 | if (refcount_inc_not_zero(&sk->sk_refcnt)) { |
14afee4b | 1867 | WARN_ON(refcount_sub_and_test(skb->truesize, &sk->sk_wmem_alloc)); |
f6ba8d33 ED |
1868 | skb->destructor = sock_efree; |
1869 | } | |
f2f872f9 ED |
1870 | } else { |
1871 | skb_orphan(skb); | |
1872 | } | |
1873 | } | |
1874 | EXPORT_SYMBOL(skb_orphan_partial); | |
1875 | ||
4ec93edb YH |
1876 | /* |
1877 | * Read buffer destructor automatically called from kfree_skb. | |
1da177e4 LT |
1878 | */ |
1879 | void sock_rfree(struct sk_buff *skb) | |
1880 | { | |
1881 | struct sock *sk = skb->sk; | |
d361fd59 | 1882 | unsigned int len = skb->truesize; |
1da177e4 | 1883 | |
d361fd59 ED |
1884 | atomic_sub(len, &sk->sk_rmem_alloc); |
1885 | sk_mem_uncharge(sk, len); | |
1da177e4 | 1886 | } |
2a91525c | 1887 | EXPORT_SYMBOL(sock_rfree); |
1da177e4 | 1888 | |
7768eed8 OH |
1889 | /* |
1890 | * Buffer destructor for skbs that are not used directly in read or write | |
1891 | * path, e.g. for error handler skbs. Automatically called from kfree_skb. | |
1892 | */ | |
62bccb8c AD |
1893 | void sock_efree(struct sk_buff *skb) |
1894 | { | |
1895 | sock_put(skb->sk); | |
1896 | } | |
1897 | EXPORT_SYMBOL(sock_efree); | |
1898 | ||
976d0201 | 1899 | kuid_t sock_i_uid(struct sock *sk) |
1da177e4 | 1900 | { |
976d0201 | 1901 | kuid_t uid; |
1da177e4 | 1902 | |
f064af1e | 1903 | read_lock_bh(&sk->sk_callback_lock); |
976d0201 | 1904 | uid = sk->sk_socket ? SOCK_INODE(sk->sk_socket)->i_uid : GLOBAL_ROOT_UID; |
f064af1e | 1905 | read_unlock_bh(&sk->sk_callback_lock); |
1da177e4 LT |
1906 | return uid; |
1907 | } | |
2a91525c | 1908 | EXPORT_SYMBOL(sock_i_uid); |
1da177e4 LT |
1909 | |
1910 | unsigned long sock_i_ino(struct sock *sk) | |
1911 | { | |
1912 | unsigned long ino; | |
1913 | ||
f064af1e | 1914 | read_lock_bh(&sk->sk_callback_lock); |
1da177e4 | 1915 | ino = sk->sk_socket ? SOCK_INODE(sk->sk_socket)->i_ino : 0; |
f064af1e | 1916 | read_unlock_bh(&sk->sk_callback_lock); |
1da177e4 LT |
1917 | return ino; |
1918 | } | |
2a91525c | 1919 | EXPORT_SYMBOL(sock_i_ino); |
1da177e4 LT |
1920 | |
1921 | /* | |
1922 | * Allocate a skb from the socket's send buffer. | |
1923 | */ | |
86a76caf | 1924 | struct sk_buff *sock_wmalloc(struct sock *sk, unsigned long size, int force, |
dd0fc66f | 1925 | gfp_t priority) |
1da177e4 | 1926 | { |
14afee4b | 1927 | if (force || refcount_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf) { |
2a91525c | 1928 | struct sk_buff *skb = alloc_skb(size, priority); |
1da177e4 LT |
1929 | if (skb) { |
1930 | skb_set_owner_w(skb, sk); | |
1931 | return skb; | |
1932 | } | |
1933 | } | |
1934 | return NULL; | |
1935 | } | |
2a91525c | 1936 | EXPORT_SYMBOL(sock_wmalloc); |
1da177e4 | 1937 | |
98ba0bd5 WB |
1938 | static void sock_ofree(struct sk_buff *skb) |
1939 | { | |
1940 | struct sock *sk = skb->sk; | |
1941 | ||
1942 | atomic_sub(skb->truesize, &sk->sk_omem_alloc); | |
1943 | } | |
1944 | ||
1945 | struct sk_buff *sock_omalloc(struct sock *sk, unsigned long size, | |
1946 | gfp_t priority) | |
1947 | { | |
1948 | struct sk_buff *skb; | |
1949 | ||
1950 | /* small safe race: SKB_TRUESIZE may differ from final skb->truesize */ | |
1951 | if (atomic_read(&sk->sk_omem_alloc) + SKB_TRUESIZE(size) > | |
1952 | sysctl_optmem_max) | |
1953 | return NULL; | |
1954 | ||
1955 | skb = alloc_skb(size, priority); | |
1956 | if (!skb) | |
1957 | return NULL; | |
1958 | ||
1959 | atomic_add(skb->truesize, &sk->sk_omem_alloc); | |
1960 | skb->sk = sk; | |
1961 | skb->destructor = sock_ofree; | |
1962 | return skb; | |
1963 | } | |
1964 | ||
4ec93edb | 1965 | /* |
1da177e4 | 1966 | * Allocate a memory block from the socket's option memory buffer. |
4ec93edb | 1967 | */ |
dd0fc66f | 1968 | void *sock_kmalloc(struct sock *sk, int size, gfp_t priority) |
1da177e4 | 1969 | { |
95c96174 | 1970 | if ((unsigned int)size <= sysctl_optmem_max && |
1da177e4 LT |
1971 | atomic_read(&sk->sk_omem_alloc) + size < sysctl_optmem_max) { |
1972 | void *mem; | |
1973 | /* First do the add, to avoid the race if kmalloc | |
4ec93edb | 1974 | * might sleep. |
1da177e4 LT |
1975 | */ |
1976 | atomic_add(size, &sk->sk_omem_alloc); | |
1977 | mem = kmalloc(size, priority); | |
1978 | if (mem) | |
1979 | return mem; | |
1980 | atomic_sub(size, &sk->sk_omem_alloc); | |
1981 | } | |
1982 | return NULL; | |
1983 | } | |
2a91525c | 1984 | EXPORT_SYMBOL(sock_kmalloc); |
1da177e4 | 1985 | |
79e88659 DB |
1986 | /* Free an option memory block. Note, we actually want the inline |
1987 | * here as this allows gcc to detect the nullify and fold away the | |
1988 | * condition entirely. | |
1da177e4 | 1989 | */ |
79e88659 DB |
1990 | static inline void __sock_kfree_s(struct sock *sk, void *mem, int size, |
1991 | const bool nullify) | |
1da177e4 | 1992 | { |
e53da5fb DM |
1993 | if (WARN_ON_ONCE(!mem)) |
1994 | return; | |
79e88659 DB |
1995 | if (nullify) |
1996 | kzfree(mem); | |
1997 | else | |
1998 | kfree(mem); | |
1da177e4 LT |
1999 | atomic_sub(size, &sk->sk_omem_alloc); |
2000 | } | |
79e88659 DB |
2001 | |
2002 | void sock_kfree_s(struct sock *sk, void *mem, int size) | |
2003 | { | |
2004 | __sock_kfree_s(sk, mem, size, false); | |
2005 | } | |
2a91525c | 2006 | EXPORT_SYMBOL(sock_kfree_s); |
1da177e4 | 2007 | |
79e88659 DB |
2008 | void sock_kzfree_s(struct sock *sk, void *mem, int size) |
2009 | { | |
2010 | __sock_kfree_s(sk, mem, size, true); | |
2011 | } | |
2012 | EXPORT_SYMBOL(sock_kzfree_s); | |
2013 | ||
1da177e4 LT |
2014 | /* It is almost wait_for_tcp_memory minus release_sock/lock_sock. |
2015 | I think, these locks should be removed for datagram sockets. | |
2016 | */ | |
2a91525c | 2017 | static long sock_wait_for_wmem(struct sock *sk, long timeo) |
1da177e4 LT |
2018 | { |
2019 | DEFINE_WAIT(wait); | |
2020 | ||
9cd3e072 | 2021 | sk_clear_bit(SOCKWQ_ASYNC_NOSPACE, sk); |
1da177e4 LT |
2022 | for (;;) { |
2023 | if (!timeo) | |
2024 | break; | |
2025 | if (signal_pending(current)) | |
2026 | break; | |
2027 | set_bit(SOCK_NOSPACE, &sk->sk_socket->flags); | |
aa395145 | 2028 | prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE); |
14afee4b | 2029 | if (refcount_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf) |
1da177e4 LT |
2030 | break; |
2031 | if (sk->sk_shutdown & SEND_SHUTDOWN) | |
2032 | break; | |
2033 | if (sk->sk_err) | |
2034 | break; | |
2035 | timeo = schedule_timeout(timeo); | |
2036 | } | |
aa395145 | 2037 | finish_wait(sk_sleep(sk), &wait); |
1da177e4 LT |
2038 | return timeo; |
2039 | } | |
2040 | ||
2041 | ||
2042 | /* | |
2043 | * Generic send/receive buffer handlers | |
2044 | */ | |
2045 | ||
4cc7f68d HX |
2046 | struct sk_buff *sock_alloc_send_pskb(struct sock *sk, unsigned long header_len, |
2047 | unsigned long data_len, int noblock, | |
28d64271 | 2048 | int *errcode, int max_page_order) |
1da177e4 | 2049 | { |
2e4e4410 | 2050 | struct sk_buff *skb; |
1da177e4 LT |
2051 | long timeo; |
2052 | int err; | |
2053 | ||
1da177e4 | 2054 | timeo = sock_sndtimeo(sk, noblock); |
2e4e4410 | 2055 | for (;;) { |
1da177e4 LT |
2056 | err = sock_error(sk); |
2057 | if (err != 0) | |
2058 | goto failure; | |
2059 | ||
2060 | err = -EPIPE; | |
2061 | if (sk->sk_shutdown & SEND_SHUTDOWN) | |
2062 | goto failure; | |
2063 | ||
2e4e4410 ED |
2064 | if (sk_wmem_alloc_get(sk) < sk->sk_sndbuf) |
2065 | break; | |
28d64271 | 2066 | |
9cd3e072 | 2067 | sk_set_bit(SOCKWQ_ASYNC_NOSPACE, sk); |
2e4e4410 ED |
2068 | set_bit(SOCK_NOSPACE, &sk->sk_socket->flags); |
2069 | err = -EAGAIN; | |
2070 | if (!timeo) | |
1da177e4 | 2071 | goto failure; |
2e4e4410 ED |
2072 | if (signal_pending(current)) |
2073 | goto interrupted; | |
2074 | timeo = sock_wait_for_wmem(sk, timeo); | |
1da177e4 | 2075 | } |
2e4e4410 ED |
2076 | skb = alloc_skb_with_frags(header_len, data_len, max_page_order, |
2077 | errcode, sk->sk_allocation); | |
2078 | if (skb) | |
2079 | skb_set_owner_w(skb, sk); | |
1da177e4 LT |
2080 | return skb; |
2081 | ||
2082 | interrupted: | |
2083 | err = sock_intr_errno(timeo); | |
2084 | failure: | |
2085 | *errcode = err; | |
2086 | return NULL; | |
2087 | } | |
4cc7f68d | 2088 | EXPORT_SYMBOL(sock_alloc_send_pskb); |
1da177e4 | 2089 | |
4ec93edb | 2090 | struct sk_buff *sock_alloc_send_skb(struct sock *sk, unsigned long size, |
1da177e4 LT |
2091 | int noblock, int *errcode) |
2092 | { | |
28d64271 | 2093 | return sock_alloc_send_pskb(sk, size, 0, noblock, errcode, 0); |
1da177e4 | 2094 | } |
2a91525c | 2095 | EXPORT_SYMBOL(sock_alloc_send_skb); |
1da177e4 | 2096 | |
39771b12 WB |
2097 | int __sock_cmsg_send(struct sock *sk, struct msghdr *msg, struct cmsghdr *cmsg, |
2098 | struct sockcm_cookie *sockc) | |
2099 | { | |
3dd17e63 SHY |
2100 | u32 tsflags; |
2101 | ||
39771b12 WB |
2102 | switch (cmsg->cmsg_type) { |
2103 | case SO_MARK: | |
2104 | if (!ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN)) | |
2105 | return -EPERM; | |
2106 | if (cmsg->cmsg_len != CMSG_LEN(sizeof(u32))) | |
2107 | return -EINVAL; | |
2108 | sockc->mark = *(u32 *)CMSG_DATA(cmsg); | |
2109 | break; | |
3dd17e63 SHY |
2110 | case SO_TIMESTAMPING: |
2111 | if (cmsg->cmsg_len != CMSG_LEN(sizeof(u32))) | |
2112 | return -EINVAL; | |
2113 | ||
2114 | tsflags = *(u32 *)CMSG_DATA(cmsg); | |
2115 | if (tsflags & ~SOF_TIMESTAMPING_TX_RECORD_MASK) | |
2116 | return -EINVAL; | |
2117 | ||
2118 | sockc->tsflags &= ~SOF_TIMESTAMPING_TX_RECORD_MASK; | |
2119 | sockc->tsflags |= tsflags; | |
2120 | break; | |
779f1ede SHY |
2121 | /* SCM_RIGHTS and SCM_CREDENTIALS are semantically in SOL_UNIX. */ |
2122 | case SCM_RIGHTS: | |
2123 | case SCM_CREDENTIALS: | |
2124 | break; | |
39771b12 WB |
2125 | default: |
2126 | return -EINVAL; | |
2127 | } | |
2128 | return 0; | |
2129 | } | |
2130 | EXPORT_SYMBOL(__sock_cmsg_send); | |
2131 | ||
f28ea365 EJ |
2132 | int sock_cmsg_send(struct sock *sk, struct msghdr *msg, |
2133 | struct sockcm_cookie *sockc) | |
2134 | { | |
2135 | struct cmsghdr *cmsg; | |
39771b12 | 2136 | int ret; |
f28ea365 EJ |
2137 | |
2138 | for_each_cmsghdr(cmsg, msg) { | |
2139 | if (!CMSG_OK(msg, cmsg)) | |
2140 | return -EINVAL; | |
2141 | if (cmsg->cmsg_level != SOL_SOCKET) | |
2142 | continue; | |
39771b12 WB |
2143 | ret = __sock_cmsg_send(sk, msg, cmsg, sockc); |
2144 | if (ret) | |
2145 | return ret; | |
f28ea365 EJ |
2146 | } |
2147 | return 0; | |
2148 | } | |
2149 | EXPORT_SYMBOL(sock_cmsg_send); | |
2150 | ||
06044751 ED |
2151 | static void sk_enter_memory_pressure(struct sock *sk) |
2152 | { | |
2153 | if (!sk->sk_prot->enter_memory_pressure) | |
2154 | return; | |
2155 | ||
2156 | sk->sk_prot->enter_memory_pressure(sk); | |
2157 | } | |
2158 | ||
2159 | static void sk_leave_memory_pressure(struct sock *sk) | |
2160 | { | |
2161 | if (sk->sk_prot->leave_memory_pressure) { | |
2162 | sk->sk_prot->leave_memory_pressure(sk); | |
2163 | } else { | |
2164 | unsigned long *memory_pressure = sk->sk_prot->memory_pressure; | |
2165 | ||
2166 | if (memory_pressure && *memory_pressure) | |
2167 | *memory_pressure = 0; | |
2168 | } | |
2169 | } | |
2170 | ||
5640f768 ED |
2171 | /* On 32bit arches, an skb frag is limited to 2^15 */ |
2172 | #define SKB_FRAG_PAGE_ORDER get_order(32768) | |
2173 | ||
400dfd3a ED |
2174 | /** |
2175 | * skb_page_frag_refill - check that a page_frag contains enough room | |
2176 | * @sz: minimum size of the fragment we want to get | |
2177 | * @pfrag: pointer to page_frag | |
82d5e2b8 | 2178 | * @gfp: priority for memory allocation |
400dfd3a ED |
2179 | * |
2180 | * Note: While this allocator tries to use high order pages, there is | |
2181 | * no guarantee that allocations succeed. Therefore, @sz MUST be | |
2182 | * less or equal than PAGE_SIZE. | |
2183 | */ | |
d9b2938a | 2184 | bool skb_page_frag_refill(unsigned int sz, struct page_frag *pfrag, gfp_t gfp) |
5640f768 | 2185 | { |
5640f768 | 2186 | if (pfrag->page) { |
fe896d18 | 2187 | if (page_ref_count(pfrag->page) == 1) { |
5640f768 ED |
2188 | pfrag->offset = 0; |
2189 | return true; | |
2190 | } | |
400dfd3a | 2191 | if (pfrag->offset + sz <= pfrag->size) |
5640f768 ED |
2192 | return true; |
2193 | put_page(pfrag->page); | |
2194 | } | |
2195 | ||
d9b2938a ED |
2196 | pfrag->offset = 0; |
2197 | if (SKB_FRAG_PAGE_ORDER) { | |
d0164adc MG |
2198 | /* Avoid direct reclaim but allow kswapd to wake */ |
2199 | pfrag->page = alloc_pages((gfp & ~__GFP_DIRECT_RECLAIM) | | |
2200 | __GFP_COMP | __GFP_NOWARN | | |
2201 | __GFP_NORETRY, | |
d9b2938a | 2202 | SKB_FRAG_PAGE_ORDER); |
5640f768 | 2203 | if (likely(pfrag->page)) { |
d9b2938a | 2204 | pfrag->size = PAGE_SIZE << SKB_FRAG_PAGE_ORDER; |
5640f768 ED |
2205 | return true; |
2206 | } | |
d9b2938a ED |
2207 | } |
2208 | pfrag->page = alloc_page(gfp); | |
2209 | if (likely(pfrag->page)) { | |
2210 | pfrag->size = PAGE_SIZE; | |
2211 | return true; | |
2212 | } | |
400dfd3a ED |
2213 | return false; |
2214 | } | |
2215 | EXPORT_SYMBOL(skb_page_frag_refill); | |
2216 | ||
2217 | bool sk_page_frag_refill(struct sock *sk, struct page_frag *pfrag) | |
2218 | { | |
2219 | if (likely(skb_page_frag_refill(32U, pfrag, sk->sk_allocation))) | |
2220 | return true; | |
2221 | ||
5640f768 ED |
2222 | sk_enter_memory_pressure(sk); |
2223 | sk_stream_moderate_sndbuf(sk); | |
2224 | return false; | |
2225 | } | |
2226 | EXPORT_SYMBOL(sk_page_frag_refill); | |
2227 | ||
1da177e4 | 2228 | static void __lock_sock(struct sock *sk) |
f39234d6 NK |
2229 | __releases(&sk->sk_lock.slock) |
2230 | __acquires(&sk->sk_lock.slock) | |
1da177e4 LT |
2231 | { |
2232 | DEFINE_WAIT(wait); | |
2233 | ||
e71a4783 | 2234 | for (;;) { |
1da177e4 LT |
2235 | prepare_to_wait_exclusive(&sk->sk_lock.wq, &wait, |
2236 | TASK_UNINTERRUPTIBLE); | |
2237 | spin_unlock_bh(&sk->sk_lock.slock); | |
2238 | schedule(); | |
2239 | spin_lock_bh(&sk->sk_lock.slock); | |
e71a4783 | 2240 | if (!sock_owned_by_user(sk)) |
1da177e4 LT |
2241 | break; |
2242 | } | |
2243 | finish_wait(&sk->sk_lock.wq, &wait); | |
2244 | } | |
2245 | ||
e6ddc2c3 | 2246 | void __release_sock(struct sock *sk) |
f39234d6 NK |
2247 | __releases(&sk->sk_lock.slock) |
2248 | __acquires(&sk->sk_lock.slock) | |
1da177e4 | 2249 | { |
5413d1ba | 2250 | struct sk_buff *skb, *next; |
1da177e4 | 2251 | |
5413d1ba | 2252 | while ((skb = sk->sk_backlog.head) != NULL) { |
1da177e4 | 2253 | sk->sk_backlog.head = sk->sk_backlog.tail = NULL; |
1da177e4 | 2254 | |
5413d1ba | 2255 | spin_unlock_bh(&sk->sk_lock.slock); |
1da177e4 | 2256 | |
5413d1ba ED |
2257 | do { |
2258 | next = skb->next; | |
e4cbb02a | 2259 | prefetch(next); |
7fee226a | 2260 | WARN_ON_ONCE(skb_dst_is_noref(skb)); |
1da177e4 | 2261 | skb->next = NULL; |
c57943a1 | 2262 | sk_backlog_rcv(sk, skb); |
1da177e4 | 2263 | |
5413d1ba | 2264 | cond_resched(); |
1da177e4 LT |
2265 | |
2266 | skb = next; | |
2267 | } while (skb != NULL); | |
2268 | ||
5413d1ba ED |
2269 | spin_lock_bh(&sk->sk_lock.slock); |
2270 | } | |
8eae939f ZY |
2271 | |
2272 | /* | |
2273 | * Doing the zeroing here guarantee we can not loop forever | |
2274 | * while a wild producer attempts to flood us. | |
2275 | */ | |
2276 | sk->sk_backlog.len = 0; | |
1da177e4 LT |
2277 | } |
2278 | ||
d41a69f1 ED |
2279 | void __sk_flush_backlog(struct sock *sk) |
2280 | { | |
2281 | spin_lock_bh(&sk->sk_lock.slock); | |
2282 | __release_sock(sk); | |
2283 | spin_unlock_bh(&sk->sk_lock.slock); | |
2284 | } | |
2285 | ||
1da177e4 LT |
2286 | /** |
2287 | * sk_wait_data - wait for data to arrive at sk_receive_queue | |
4dc3b16b PP |
2288 | * @sk: sock to wait on |
2289 | * @timeo: for how long | |
dfbafc99 | 2290 | * @skb: last skb seen on sk_receive_queue |
1da177e4 LT |
2291 | * |
2292 | * Now socket state including sk->sk_err is changed only under lock, | |
2293 | * hence we may omit checks after joining wait queue. | |
2294 | * We check receive queue before schedule() only as optimization; | |
2295 | * it is very likely that release_sock() added new data. | |
2296 | */ | |
dfbafc99 | 2297 | int sk_wait_data(struct sock *sk, long *timeo, const struct sk_buff *skb) |
1da177e4 | 2298 | { |
d9dc8b0f | 2299 | DEFINE_WAIT_FUNC(wait, woken_wake_function); |
1da177e4 | 2300 | int rc; |
1da177e4 | 2301 | |
d9dc8b0f | 2302 | add_wait_queue(sk_sleep(sk), &wait); |
9cd3e072 | 2303 | sk_set_bit(SOCKWQ_ASYNC_WAITDATA, sk); |
d9dc8b0f | 2304 | rc = sk_wait_event(sk, timeo, skb_peek_tail(&sk->sk_receive_queue) != skb, &wait); |
9cd3e072 | 2305 | sk_clear_bit(SOCKWQ_ASYNC_WAITDATA, sk); |
d9dc8b0f | 2306 | remove_wait_queue(sk_sleep(sk), &wait); |
1da177e4 LT |
2307 | return rc; |
2308 | } | |
1da177e4 LT |
2309 | EXPORT_SYMBOL(sk_wait_data); |
2310 | ||
3ab224be | 2311 | /** |
f8c3bf00 | 2312 | * __sk_mem_raise_allocated - increase memory_allocated |
3ab224be HA |
2313 | * @sk: socket |
2314 | * @size: memory size to allocate | |
f8c3bf00 | 2315 | * @amt: pages to allocate |
3ab224be HA |
2316 | * @kind: allocation type |
2317 | * | |
f8c3bf00 | 2318 | * Similar to __sk_mem_schedule(), but does not update sk_forward_alloc |
3ab224be | 2319 | */ |
f8c3bf00 | 2320 | int __sk_mem_raise_allocated(struct sock *sk, int size, int amt, int kind) |
3ab224be HA |
2321 | { |
2322 | struct proto *prot = sk->sk_prot; | |
f8c3bf00 | 2323 | long allocated = sk_memory_allocated_add(sk, amt); |
e805605c | 2324 | |
baac50bb JW |
2325 | if (mem_cgroup_sockets_enabled && sk->sk_memcg && |
2326 | !mem_cgroup_charge_skmem(sk->sk_memcg, amt)) | |
e805605c | 2327 | goto suppress_allocation; |
3ab224be HA |
2328 | |
2329 | /* Under limit. */ | |
e805605c | 2330 | if (allocated <= sk_prot_mem_limits(sk, 0)) { |
180d8cd9 | 2331 | sk_leave_memory_pressure(sk); |
3ab224be HA |
2332 | return 1; |
2333 | } | |
2334 | ||
e805605c JW |
2335 | /* Under pressure. */ |
2336 | if (allocated > sk_prot_mem_limits(sk, 1)) | |
180d8cd9 | 2337 | sk_enter_memory_pressure(sk); |
3ab224be | 2338 | |
e805605c JW |
2339 | /* Over hard limit. */ |
2340 | if (allocated > sk_prot_mem_limits(sk, 2)) | |
3ab224be HA |
2341 | goto suppress_allocation; |
2342 | ||
2343 | /* guarantee minimum buffer size under pressure */ | |
2344 | if (kind == SK_MEM_RECV) { | |
2345 | if (atomic_read(&sk->sk_rmem_alloc) < prot->sysctl_rmem[0]) | |
2346 | return 1; | |
180d8cd9 | 2347 | |
3ab224be HA |
2348 | } else { /* SK_MEM_SEND */ |
2349 | if (sk->sk_type == SOCK_STREAM) { | |
2350 | if (sk->sk_wmem_queued < prot->sysctl_wmem[0]) | |
2351 | return 1; | |
14afee4b | 2352 | } else if (refcount_read(&sk->sk_wmem_alloc) < |
3ab224be HA |
2353 | prot->sysctl_wmem[0]) |
2354 | return 1; | |
2355 | } | |
2356 | ||
180d8cd9 | 2357 | if (sk_has_memory_pressure(sk)) { |
1748376b ED |
2358 | int alloc; |
2359 | ||
180d8cd9 | 2360 | if (!sk_under_memory_pressure(sk)) |
1748376b | 2361 | return 1; |
180d8cd9 GC |
2362 | alloc = sk_sockets_allocated_read_positive(sk); |
2363 | if (sk_prot_mem_limits(sk, 2) > alloc * | |
3ab224be HA |
2364 | sk_mem_pages(sk->sk_wmem_queued + |
2365 | atomic_read(&sk->sk_rmem_alloc) + | |
2366 | sk->sk_forward_alloc)) | |
2367 | return 1; | |
2368 | } | |
2369 | ||
2370 | suppress_allocation: | |
2371 | ||
2372 | if (kind == SK_MEM_SEND && sk->sk_type == SOCK_STREAM) { | |
2373 | sk_stream_moderate_sndbuf(sk); | |
2374 | ||
2375 | /* Fail only if socket is _under_ its sndbuf. | |
2376 | * In this case we cannot block, so that we have to fail. | |
2377 | */ | |
2378 | if (sk->sk_wmem_queued + size >= sk->sk_sndbuf) | |
2379 | return 1; | |
2380 | } | |
2381 | ||
3847ce32 SM |
2382 | trace_sock_exceed_buf_limit(sk, prot, allocated); |
2383 | ||
0e90b31f | 2384 | sk_memory_allocated_sub(sk, amt); |
180d8cd9 | 2385 | |
baac50bb JW |
2386 | if (mem_cgroup_sockets_enabled && sk->sk_memcg) |
2387 | mem_cgroup_uncharge_skmem(sk->sk_memcg, amt); | |
e805605c | 2388 | |
3ab224be HA |
2389 | return 0; |
2390 | } | |
f8c3bf00 PA |
2391 | EXPORT_SYMBOL(__sk_mem_raise_allocated); |
2392 | ||
2393 | /** | |
2394 | * __sk_mem_schedule - increase sk_forward_alloc and memory_allocated | |
2395 | * @sk: socket | |
2396 | * @size: memory size to allocate | |
2397 | * @kind: allocation type | |
2398 | * | |
2399 | * If kind is SK_MEM_SEND, it means wmem allocation. Otherwise it means | |
2400 | * rmem allocation. This function assumes that protocols which have | |
2401 | * memory_pressure use sk_wmem_queued as write buffer accounting. | |
2402 | */ | |
2403 | int __sk_mem_schedule(struct sock *sk, int size, int kind) | |
2404 | { | |
2405 | int ret, amt = sk_mem_pages(size); | |
2406 | ||
2407 | sk->sk_forward_alloc += amt << SK_MEM_QUANTUM_SHIFT; | |
2408 | ret = __sk_mem_raise_allocated(sk, size, amt, kind); | |
2409 | if (!ret) | |
2410 | sk->sk_forward_alloc -= amt << SK_MEM_QUANTUM_SHIFT; | |
2411 | return ret; | |
2412 | } | |
3ab224be HA |
2413 | EXPORT_SYMBOL(__sk_mem_schedule); |
2414 | ||
2415 | /** | |
f8c3bf00 | 2416 | * __sk_mem_reduce_allocated - reclaim memory_allocated |
3ab224be | 2417 | * @sk: socket |
f8c3bf00 PA |
2418 | * @amount: number of quanta |
2419 | * | |
2420 | * Similar to __sk_mem_reclaim(), but does not update sk_forward_alloc | |
3ab224be | 2421 | */ |
f8c3bf00 | 2422 | void __sk_mem_reduce_allocated(struct sock *sk, int amount) |
3ab224be | 2423 | { |
1a24e04e | 2424 | sk_memory_allocated_sub(sk, amount); |
3ab224be | 2425 | |
baac50bb JW |
2426 | if (mem_cgroup_sockets_enabled && sk->sk_memcg) |
2427 | mem_cgroup_uncharge_skmem(sk->sk_memcg, amount); | |
e805605c | 2428 | |
180d8cd9 GC |
2429 | if (sk_under_memory_pressure(sk) && |
2430 | (sk_memory_allocated(sk) < sk_prot_mem_limits(sk, 0))) | |
2431 | sk_leave_memory_pressure(sk); | |
3ab224be | 2432 | } |
f8c3bf00 PA |
2433 | EXPORT_SYMBOL(__sk_mem_reduce_allocated); |
2434 | ||
2435 | /** | |
2436 | * __sk_mem_reclaim - reclaim sk_forward_alloc and memory_allocated | |
2437 | * @sk: socket | |
2438 | * @amount: number of bytes (rounded down to a SK_MEM_QUANTUM multiple) | |
2439 | */ | |
2440 | void __sk_mem_reclaim(struct sock *sk, int amount) | |
2441 | { | |
2442 | amount >>= SK_MEM_QUANTUM_SHIFT; | |
2443 | sk->sk_forward_alloc -= amount << SK_MEM_QUANTUM_SHIFT; | |
2444 | __sk_mem_reduce_allocated(sk, amount); | |
2445 | } | |
3ab224be HA |
2446 | EXPORT_SYMBOL(__sk_mem_reclaim); |
2447 | ||
627d2d6b | 2448 | int sk_set_peek_off(struct sock *sk, int val) |
2449 | { | |
627d2d6b | 2450 | sk->sk_peek_off = val; |
2451 | return 0; | |
2452 | } | |
2453 | EXPORT_SYMBOL_GPL(sk_set_peek_off); | |
3ab224be | 2454 | |
1da177e4 LT |
2455 | /* |
2456 | * Set of default routines for initialising struct proto_ops when | |
2457 | * the protocol does not support a particular function. In certain | |
2458 | * cases where it makes no sense for a protocol to have a "do nothing" | |
2459 | * function, some default processing is provided. | |
2460 | */ | |
2461 | ||
2462 | int sock_no_bind(struct socket *sock, struct sockaddr *saddr, int len) | |
2463 | { | |
2464 | return -EOPNOTSUPP; | |
2465 | } | |
2a91525c | 2466 | EXPORT_SYMBOL(sock_no_bind); |
1da177e4 | 2467 | |
4ec93edb | 2468 | int sock_no_connect(struct socket *sock, struct sockaddr *saddr, |
1da177e4 LT |
2469 | int len, int flags) |
2470 | { | |
2471 | return -EOPNOTSUPP; | |
2472 | } | |
2a91525c | 2473 | EXPORT_SYMBOL(sock_no_connect); |
1da177e4 LT |
2474 | |
2475 | int sock_no_socketpair(struct socket *sock1, struct socket *sock2) | |
2476 | { | |
2477 | return -EOPNOTSUPP; | |
2478 | } | |
2a91525c | 2479 | EXPORT_SYMBOL(sock_no_socketpair); |
1da177e4 | 2480 | |
cdfbabfb DH |
2481 | int sock_no_accept(struct socket *sock, struct socket *newsock, int flags, |
2482 | bool kern) | |
1da177e4 LT |
2483 | { |
2484 | return -EOPNOTSUPP; | |
2485 | } | |
2a91525c | 2486 | EXPORT_SYMBOL(sock_no_accept); |
1da177e4 | 2487 | |
4ec93edb | 2488 | int sock_no_getname(struct socket *sock, struct sockaddr *saddr, |
1da177e4 LT |
2489 | int *len, int peer) |
2490 | { | |
2491 | return -EOPNOTSUPP; | |
2492 | } | |
2a91525c | 2493 | EXPORT_SYMBOL(sock_no_getname); |
1da177e4 | 2494 | |
2a91525c | 2495 | unsigned int sock_no_poll(struct file *file, struct socket *sock, poll_table *pt) |
1da177e4 LT |
2496 | { |
2497 | return 0; | |
2498 | } | |
2a91525c | 2499 | EXPORT_SYMBOL(sock_no_poll); |
1da177e4 LT |
2500 | |
2501 | int sock_no_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg) | |
2502 | { | |
2503 | return -EOPNOTSUPP; | |
2504 | } | |
2a91525c | 2505 | EXPORT_SYMBOL(sock_no_ioctl); |
1da177e4 LT |
2506 | |
2507 | int sock_no_listen(struct socket *sock, int backlog) | |
2508 | { | |
2509 | return -EOPNOTSUPP; | |
2510 | } | |
2a91525c | 2511 | EXPORT_SYMBOL(sock_no_listen); |
1da177e4 LT |
2512 | |
2513 | int sock_no_shutdown(struct socket *sock, int how) | |
2514 | { | |
2515 | return -EOPNOTSUPP; | |
2516 | } | |
2a91525c | 2517 | EXPORT_SYMBOL(sock_no_shutdown); |
1da177e4 LT |
2518 | |
2519 | int sock_no_setsockopt(struct socket *sock, int level, int optname, | |
b7058842 | 2520 | char __user *optval, unsigned int optlen) |
1da177e4 LT |
2521 | { |
2522 | return -EOPNOTSUPP; | |
2523 | } | |
2a91525c | 2524 | EXPORT_SYMBOL(sock_no_setsockopt); |
1da177e4 LT |
2525 | |
2526 | int sock_no_getsockopt(struct socket *sock, int level, int optname, | |
2527 | char __user *optval, int __user *optlen) | |
2528 | { | |
2529 | return -EOPNOTSUPP; | |
2530 | } | |
2a91525c | 2531 | EXPORT_SYMBOL(sock_no_getsockopt); |
1da177e4 | 2532 | |
1b784140 | 2533 | int sock_no_sendmsg(struct socket *sock, struct msghdr *m, size_t len) |
1da177e4 LT |
2534 | { |
2535 | return -EOPNOTSUPP; | |
2536 | } | |
2a91525c | 2537 | EXPORT_SYMBOL(sock_no_sendmsg); |
1da177e4 | 2538 | |
306b13eb TH |
2539 | int sock_no_sendmsg_locked(struct sock *sk, struct msghdr *m, size_t len) |
2540 | { | |
2541 | return -EOPNOTSUPP; | |
2542 | } | |
2543 | EXPORT_SYMBOL(sock_no_sendmsg_locked); | |
2544 | ||
1b784140 YX |
2545 | int sock_no_recvmsg(struct socket *sock, struct msghdr *m, size_t len, |
2546 | int flags) | |
1da177e4 LT |
2547 | { |
2548 | return -EOPNOTSUPP; | |
2549 | } | |
2a91525c | 2550 | EXPORT_SYMBOL(sock_no_recvmsg); |
1da177e4 LT |
2551 | |
2552 | int sock_no_mmap(struct file *file, struct socket *sock, struct vm_area_struct *vma) | |
2553 | { | |
2554 | /* Mirror missing mmap method error code */ | |
2555 | return -ENODEV; | |
2556 | } | |
2a91525c | 2557 | EXPORT_SYMBOL(sock_no_mmap); |
1da177e4 LT |
2558 | |
2559 | ssize_t sock_no_sendpage(struct socket *sock, struct page *page, int offset, size_t size, int flags) | |
2560 | { | |
2561 | ssize_t res; | |
2562 | struct msghdr msg = {.msg_flags = flags}; | |
2563 | struct kvec iov; | |
2564 | char *kaddr = kmap(page); | |
2565 | iov.iov_base = kaddr + offset; | |
2566 | iov.iov_len = size; | |
2567 | res = kernel_sendmsg(sock, &msg, &iov, 1, size); | |
2568 | kunmap(page); | |
2569 | return res; | |
2570 | } | |
2a91525c | 2571 | EXPORT_SYMBOL(sock_no_sendpage); |
1da177e4 | 2572 | |
306b13eb TH |
2573 | ssize_t sock_no_sendpage_locked(struct sock *sk, struct page *page, |
2574 | int offset, size_t size, int flags) | |
2575 | { | |
2576 | ssize_t res; | |
2577 | struct msghdr msg = {.msg_flags = flags}; | |
2578 | struct kvec iov; | |
2579 | char *kaddr = kmap(page); | |
2580 | ||
2581 | iov.iov_base = kaddr + offset; | |
2582 | iov.iov_len = size; | |
2583 | res = kernel_sendmsg_locked(sk, &msg, &iov, 1, size); | |
2584 | kunmap(page); | |
2585 | return res; | |
2586 | } | |
2587 | EXPORT_SYMBOL(sock_no_sendpage_locked); | |
2588 | ||
1da177e4 LT |
2589 | /* |
2590 | * Default Socket Callbacks | |
2591 | */ | |
2592 | ||
2593 | static void sock_def_wakeup(struct sock *sk) | |
2594 | { | |
43815482 ED |
2595 | struct socket_wq *wq; |
2596 | ||
2597 | rcu_read_lock(); | |
2598 | wq = rcu_dereference(sk->sk_wq); | |
1ce0bf50 | 2599 | if (skwq_has_sleeper(wq)) |
43815482 ED |
2600 | wake_up_interruptible_all(&wq->wait); |
2601 | rcu_read_unlock(); | |
1da177e4 LT |
2602 | } |
2603 | ||
2604 | static void sock_def_error_report(struct sock *sk) | |
2605 | { | |
43815482 ED |
2606 | struct socket_wq *wq; |
2607 | ||
2608 | rcu_read_lock(); | |
2609 | wq = rcu_dereference(sk->sk_wq); | |
1ce0bf50 | 2610 | if (skwq_has_sleeper(wq)) |
43815482 | 2611 | wake_up_interruptible_poll(&wq->wait, POLLERR); |
8d8ad9d7 | 2612 | sk_wake_async(sk, SOCK_WAKE_IO, POLL_ERR); |
43815482 | 2613 | rcu_read_unlock(); |
1da177e4 LT |
2614 | } |
2615 | ||
676d2369 | 2616 | static void sock_def_readable(struct sock *sk) |
1da177e4 | 2617 | { |
43815482 ED |
2618 | struct socket_wq *wq; |
2619 | ||
2620 | rcu_read_lock(); | |
2621 | wq = rcu_dereference(sk->sk_wq); | |
1ce0bf50 | 2622 | if (skwq_has_sleeper(wq)) |
2c6607c6 | 2623 | wake_up_interruptible_sync_poll(&wq->wait, POLLIN | POLLPRI | |
37e5540b | 2624 | POLLRDNORM | POLLRDBAND); |
8d8ad9d7 | 2625 | sk_wake_async(sk, SOCK_WAKE_WAITD, POLL_IN); |
43815482 | 2626 | rcu_read_unlock(); |
1da177e4 LT |
2627 | } |
2628 | ||
2629 | static void sock_def_write_space(struct sock *sk) | |
2630 | { | |
43815482 ED |
2631 | struct socket_wq *wq; |
2632 | ||
2633 | rcu_read_lock(); | |
1da177e4 LT |
2634 | |
2635 | /* Do not wake up a writer until he can make "significant" | |
2636 | * progress. --DaveM | |
2637 | */ | |
14afee4b | 2638 | if ((refcount_read(&sk->sk_wmem_alloc) << 1) <= sk->sk_sndbuf) { |
43815482 | 2639 | wq = rcu_dereference(sk->sk_wq); |
1ce0bf50 | 2640 | if (skwq_has_sleeper(wq)) |
43815482 | 2641 | wake_up_interruptible_sync_poll(&wq->wait, POLLOUT | |
37e5540b | 2642 | POLLWRNORM | POLLWRBAND); |
1da177e4 LT |
2643 | |
2644 | /* Should agree with poll, otherwise some programs break */ | |
2645 | if (sock_writeable(sk)) | |
8d8ad9d7 | 2646 | sk_wake_async(sk, SOCK_WAKE_SPACE, POLL_OUT); |
1da177e4 LT |
2647 | } |
2648 | ||
43815482 | 2649 | rcu_read_unlock(); |
1da177e4 LT |
2650 | } |
2651 | ||
2652 | static void sock_def_destruct(struct sock *sk) | |
2653 | { | |
1da177e4 LT |
2654 | } |
2655 | ||
2656 | void sk_send_sigurg(struct sock *sk) | |
2657 | { | |
2658 | if (sk->sk_socket && sk->sk_socket->file) | |
2659 | if (send_sigurg(&sk->sk_socket->file->f_owner)) | |
8d8ad9d7 | 2660 | sk_wake_async(sk, SOCK_WAKE_URG, POLL_PRI); |
1da177e4 | 2661 | } |
2a91525c | 2662 | EXPORT_SYMBOL(sk_send_sigurg); |
1da177e4 LT |
2663 | |
2664 | void sk_reset_timer(struct sock *sk, struct timer_list* timer, | |
2665 | unsigned long expires) | |
2666 | { | |
2667 | if (!mod_timer(timer, expires)) | |
2668 | sock_hold(sk); | |
2669 | } | |
1da177e4 LT |
2670 | EXPORT_SYMBOL(sk_reset_timer); |
2671 | ||
2672 | void sk_stop_timer(struct sock *sk, struct timer_list* timer) | |
2673 | { | |
25cc4ae9 | 2674 | if (del_timer(timer)) |
1da177e4 LT |
2675 | __sock_put(sk); |
2676 | } | |
1da177e4 LT |
2677 | EXPORT_SYMBOL(sk_stop_timer); |
2678 | ||
2679 | void sock_init_data(struct socket *sock, struct sock *sk) | |
2680 | { | |
581319c5 | 2681 | sk_init_common(sk); |
1da177e4 LT |
2682 | sk->sk_send_head = NULL; |
2683 | ||
2684 | init_timer(&sk->sk_timer); | |
4ec93edb | 2685 | |
1da177e4 LT |
2686 | sk->sk_allocation = GFP_KERNEL; |
2687 | sk->sk_rcvbuf = sysctl_rmem_default; | |
2688 | sk->sk_sndbuf = sysctl_wmem_default; | |
2689 | sk->sk_state = TCP_CLOSE; | |
972692e0 | 2690 | sk_set_socket(sk, sock); |
1da177e4 LT |
2691 | |
2692 | sock_set_flag(sk, SOCK_ZAPPED); | |
2693 | ||
e71a4783 | 2694 | if (sock) { |
1da177e4 | 2695 | sk->sk_type = sock->type; |
43815482 | 2696 | sk->sk_wq = sock->wq; |
1da177e4 | 2697 | sock->sk = sk; |
86741ec2 LC |
2698 | sk->sk_uid = SOCK_INODE(sock)->i_uid; |
2699 | } else { | |
43815482 | 2700 | sk->sk_wq = NULL; |
86741ec2 LC |
2701 | sk->sk_uid = make_kuid(sock_net(sk)->user_ns, 0); |
2702 | } | |
1da177e4 | 2703 | |
1da177e4 | 2704 | rwlock_init(&sk->sk_callback_lock); |
cdfbabfb DH |
2705 | if (sk->sk_kern_sock) |
2706 | lockdep_set_class_and_name( | |
2707 | &sk->sk_callback_lock, | |
2708 | af_kern_callback_keys + sk->sk_family, | |
2709 | af_family_kern_clock_key_strings[sk->sk_family]); | |
2710 | else | |
2711 | lockdep_set_class_and_name( | |
2712 | &sk->sk_callback_lock, | |
443aef0e PZ |
2713 | af_callback_keys + sk->sk_family, |
2714 | af_family_clock_key_strings[sk->sk_family]); | |
1da177e4 LT |
2715 | |
2716 | sk->sk_state_change = sock_def_wakeup; | |
2717 | sk->sk_data_ready = sock_def_readable; | |
2718 | sk->sk_write_space = sock_def_write_space; | |
2719 | sk->sk_error_report = sock_def_error_report; | |
2720 | sk->sk_destruct = sock_def_destruct; | |
2721 | ||
5640f768 ED |
2722 | sk->sk_frag.page = NULL; |
2723 | sk->sk_frag.offset = 0; | |
ef64a54f | 2724 | sk->sk_peek_off = -1; |
1da177e4 | 2725 | |
109f6e39 EB |
2726 | sk->sk_peer_pid = NULL; |
2727 | sk->sk_peer_cred = NULL; | |
1da177e4 LT |
2728 | sk->sk_write_pending = 0; |
2729 | sk->sk_rcvlowat = 1; | |
2730 | sk->sk_rcvtimeo = MAX_SCHEDULE_TIMEOUT; | |
2731 | sk->sk_sndtimeo = MAX_SCHEDULE_TIMEOUT; | |
2732 | ||
6c7c98ba | 2733 | sk->sk_stamp = SK_DEFAULT_STAMP; |
e5af70e9 DD |
2734 | #if BITS_PER_LONG==32 |
2735 | seqlock_init(&sk->sk_stamp_seq); | |
2736 | #endif | |
52267790 | 2737 | atomic_set(&sk->sk_zckey, 0); |
1da177e4 | 2738 | |
e0d1095a | 2739 | #ifdef CONFIG_NET_RX_BUSY_POLL |
06021292 | 2740 | sk->sk_napi_id = 0; |
64b0dc51 | 2741 | sk->sk_ll_usec = sysctl_net_busy_read; |
06021292 ET |
2742 | #endif |
2743 | ||
62748f32 | 2744 | sk->sk_max_pacing_rate = ~0U; |
7eec4174 | 2745 | sk->sk_pacing_rate = ~0U; |
70da268b | 2746 | sk->sk_incoming_cpu = -1; |
4dc6dc71 ED |
2747 | /* |
2748 | * Before updating sk_refcnt, we must commit prior changes to memory | |
2749 | * (Documentation/RCU/rculist_nulls.txt for details) | |
2750 | */ | |
2751 | smp_wmb(); | |
41c6d650 | 2752 | refcount_set(&sk->sk_refcnt, 1); |
33c732c3 | 2753 | atomic_set(&sk->sk_drops, 0); |
1da177e4 | 2754 | } |
2a91525c | 2755 | EXPORT_SYMBOL(sock_init_data); |
1da177e4 | 2756 | |
b5606c2d | 2757 | void lock_sock_nested(struct sock *sk, int subclass) |
1da177e4 LT |
2758 | { |
2759 | might_sleep(); | |
a5b5bb9a | 2760 | spin_lock_bh(&sk->sk_lock.slock); |
d2e9117c | 2761 | if (sk->sk_lock.owned) |
1da177e4 | 2762 | __lock_sock(sk); |
d2e9117c | 2763 | sk->sk_lock.owned = 1; |
a5b5bb9a IM |
2764 | spin_unlock(&sk->sk_lock.slock); |
2765 | /* | |
2766 | * The sk_lock has mutex_lock() semantics here: | |
2767 | */ | |
fcc70d5f | 2768 | mutex_acquire(&sk->sk_lock.dep_map, subclass, 0, _RET_IP_); |
a5b5bb9a | 2769 | local_bh_enable(); |
1da177e4 | 2770 | } |
fcc70d5f | 2771 | EXPORT_SYMBOL(lock_sock_nested); |
1da177e4 | 2772 | |
b5606c2d | 2773 | void release_sock(struct sock *sk) |
1da177e4 | 2774 | { |
a5b5bb9a | 2775 | spin_lock_bh(&sk->sk_lock.slock); |
1da177e4 LT |
2776 | if (sk->sk_backlog.tail) |
2777 | __release_sock(sk); | |
46d3ceab | 2778 | |
c3f9b018 ED |
2779 | /* Warning : release_cb() might need to release sk ownership, |
2780 | * ie call sock_release_ownership(sk) before us. | |
2781 | */ | |
46d3ceab ED |
2782 | if (sk->sk_prot->release_cb) |
2783 | sk->sk_prot->release_cb(sk); | |
2784 | ||
c3f9b018 | 2785 | sock_release_ownership(sk); |
a5b5bb9a IM |
2786 | if (waitqueue_active(&sk->sk_lock.wq)) |
2787 | wake_up(&sk->sk_lock.wq); | |
2788 | spin_unlock_bh(&sk->sk_lock.slock); | |
1da177e4 LT |
2789 | } |
2790 | EXPORT_SYMBOL(release_sock); | |
2791 | ||
8a74ad60 ED |
2792 | /** |
2793 | * lock_sock_fast - fast version of lock_sock | |
2794 | * @sk: socket | |
2795 | * | |
2796 | * This version should be used for very small section, where process wont block | |
d651983d MCC |
2797 | * return false if fast path is taken: |
2798 | * | |
8a74ad60 | 2799 | * sk_lock.slock locked, owned = 0, BH disabled |
d651983d MCC |
2800 | * |
2801 | * return true if slow path is taken: | |
2802 | * | |
8a74ad60 ED |
2803 | * sk_lock.slock unlocked, owned = 1, BH enabled |
2804 | */ | |
2805 | bool lock_sock_fast(struct sock *sk) | |
2806 | { | |
2807 | might_sleep(); | |
2808 | spin_lock_bh(&sk->sk_lock.slock); | |
2809 | ||
2810 | if (!sk->sk_lock.owned) | |
2811 | /* | |
2812 | * Note : We must disable BH | |
2813 | */ | |
2814 | return false; | |
2815 | ||
2816 | __lock_sock(sk); | |
2817 | sk->sk_lock.owned = 1; | |
2818 | spin_unlock(&sk->sk_lock.slock); | |
2819 | /* | |
2820 | * The sk_lock has mutex_lock() semantics here: | |
2821 | */ | |
2822 | mutex_acquire(&sk->sk_lock.dep_map, 0, 0, _RET_IP_); | |
2823 | local_bh_enable(); | |
2824 | return true; | |
2825 | } | |
2826 | EXPORT_SYMBOL(lock_sock_fast); | |
2827 | ||
1da177e4 | 2828 | int sock_get_timestamp(struct sock *sk, struct timeval __user *userstamp) |
4ec93edb | 2829 | { |
b7aa0bf7 | 2830 | struct timeval tv; |
1da177e4 | 2831 | if (!sock_flag(sk, SOCK_TIMESTAMP)) |
20d49473 | 2832 | sock_enable_timestamp(sk, SOCK_TIMESTAMP); |
b7aa0bf7 ED |
2833 | tv = ktime_to_timeval(sk->sk_stamp); |
2834 | if (tv.tv_sec == -1) | |
1da177e4 | 2835 | return -ENOENT; |
b7aa0bf7 ED |
2836 | if (tv.tv_sec == 0) { |
2837 | sk->sk_stamp = ktime_get_real(); | |
2838 | tv = ktime_to_timeval(sk->sk_stamp); | |
2839 | } | |
2840 | return copy_to_user(userstamp, &tv, sizeof(tv)) ? -EFAULT : 0; | |
4ec93edb | 2841 | } |
1da177e4 LT |
2842 | EXPORT_SYMBOL(sock_get_timestamp); |
2843 | ||
ae40eb1e ED |
2844 | int sock_get_timestampns(struct sock *sk, struct timespec __user *userstamp) |
2845 | { | |
2846 | struct timespec ts; | |
2847 | if (!sock_flag(sk, SOCK_TIMESTAMP)) | |
20d49473 | 2848 | sock_enable_timestamp(sk, SOCK_TIMESTAMP); |
ae40eb1e ED |
2849 | ts = ktime_to_timespec(sk->sk_stamp); |
2850 | if (ts.tv_sec == -1) | |
2851 | return -ENOENT; | |
2852 | if (ts.tv_sec == 0) { | |
2853 | sk->sk_stamp = ktime_get_real(); | |
2854 | ts = ktime_to_timespec(sk->sk_stamp); | |
2855 | } | |
2856 | return copy_to_user(userstamp, &ts, sizeof(ts)) ? -EFAULT : 0; | |
2857 | } | |
2858 | EXPORT_SYMBOL(sock_get_timestampns); | |
2859 | ||
20d49473 | 2860 | void sock_enable_timestamp(struct sock *sk, int flag) |
4ec93edb | 2861 | { |
20d49473 | 2862 | if (!sock_flag(sk, flag)) { |
08e29af3 ED |
2863 | unsigned long previous_flags = sk->sk_flags; |
2864 | ||
20d49473 PO |
2865 | sock_set_flag(sk, flag); |
2866 | /* | |
2867 | * we just set one of the two flags which require net | |
2868 | * time stamping, but time stamping might have been on | |
2869 | * already because of the other one | |
2870 | */ | |
080a270f HFS |
2871 | if (sock_needs_netstamp(sk) && |
2872 | !(previous_flags & SK_FLAGS_TIMESTAMP)) | |
20d49473 | 2873 | net_enable_timestamp(); |
1da177e4 LT |
2874 | } |
2875 | } | |
1da177e4 | 2876 | |
cb820f8e RC |
2877 | int sock_recv_errqueue(struct sock *sk, struct msghdr *msg, int len, |
2878 | int level, int type) | |
2879 | { | |
2880 | struct sock_exterr_skb *serr; | |
364a9e93 | 2881 | struct sk_buff *skb; |
cb820f8e RC |
2882 | int copied, err; |
2883 | ||
2884 | err = -EAGAIN; | |
364a9e93 | 2885 | skb = sock_dequeue_err_skb(sk); |
cb820f8e RC |
2886 | if (skb == NULL) |
2887 | goto out; | |
2888 | ||
2889 | copied = skb->len; | |
2890 | if (copied > len) { | |
2891 | msg->msg_flags |= MSG_TRUNC; | |
2892 | copied = len; | |
2893 | } | |
51f3d02b | 2894 | err = skb_copy_datagram_msg(skb, 0, msg, copied); |
cb820f8e RC |
2895 | if (err) |
2896 | goto out_free_skb; | |
2897 | ||
2898 | sock_recv_timestamp(msg, sk, skb); | |
2899 | ||
2900 | serr = SKB_EXT_ERR(skb); | |
2901 | put_cmsg(msg, level, type, sizeof(serr->ee), &serr->ee); | |
2902 | ||
2903 | msg->msg_flags |= MSG_ERRQUEUE; | |
2904 | err = copied; | |
2905 | ||
cb820f8e RC |
2906 | out_free_skb: |
2907 | kfree_skb(skb); | |
2908 | out: | |
2909 | return err; | |
2910 | } | |
2911 | EXPORT_SYMBOL(sock_recv_errqueue); | |
2912 | ||
1da177e4 LT |
2913 | /* |
2914 | * Get a socket option on an socket. | |
2915 | * | |
2916 | * FIX: POSIX 1003.1g is very ambiguous here. It states that | |
2917 | * asynchronous errors should be reported by getsockopt. We assume | |
2918 | * this means if you specify SO_ERROR (otherwise whats the point of it). | |
2919 | */ | |
2920 | int sock_common_getsockopt(struct socket *sock, int level, int optname, | |
2921 | char __user *optval, int __user *optlen) | |
2922 | { | |
2923 | struct sock *sk = sock->sk; | |
2924 | ||
2925 | return sk->sk_prot->getsockopt(sk, level, optname, optval, optlen); | |
2926 | } | |
1da177e4 LT |
2927 | EXPORT_SYMBOL(sock_common_getsockopt); |
2928 | ||
3fdadf7d | 2929 | #ifdef CONFIG_COMPAT |
543d9cfe ACM |
2930 | int compat_sock_common_getsockopt(struct socket *sock, int level, int optname, |
2931 | char __user *optval, int __user *optlen) | |
3fdadf7d DM |
2932 | { |
2933 | struct sock *sk = sock->sk; | |
2934 | ||
1e51f951 | 2935 | if (sk->sk_prot->compat_getsockopt != NULL) |
543d9cfe ACM |
2936 | return sk->sk_prot->compat_getsockopt(sk, level, optname, |
2937 | optval, optlen); | |
3fdadf7d DM |
2938 | return sk->sk_prot->getsockopt(sk, level, optname, optval, optlen); |
2939 | } | |
2940 | EXPORT_SYMBOL(compat_sock_common_getsockopt); | |
2941 | #endif | |
2942 | ||
1b784140 YX |
2943 | int sock_common_recvmsg(struct socket *sock, struct msghdr *msg, size_t size, |
2944 | int flags) | |
1da177e4 LT |
2945 | { |
2946 | struct sock *sk = sock->sk; | |
2947 | int addr_len = 0; | |
2948 | int err; | |
2949 | ||
1b784140 | 2950 | err = sk->sk_prot->recvmsg(sk, msg, size, flags & MSG_DONTWAIT, |
1da177e4 LT |
2951 | flags & ~MSG_DONTWAIT, &addr_len); |
2952 | if (err >= 0) | |
2953 | msg->msg_namelen = addr_len; | |
2954 | return err; | |
2955 | } | |
1da177e4 LT |
2956 | EXPORT_SYMBOL(sock_common_recvmsg); |
2957 | ||
2958 | /* | |
2959 | * Set socket options on an inet socket. | |
2960 | */ | |
2961 | int sock_common_setsockopt(struct socket *sock, int level, int optname, | |
b7058842 | 2962 | char __user *optval, unsigned int optlen) |
1da177e4 LT |
2963 | { |
2964 | struct sock *sk = sock->sk; | |
2965 | ||
2966 | return sk->sk_prot->setsockopt(sk, level, optname, optval, optlen); | |
2967 | } | |
1da177e4 LT |
2968 | EXPORT_SYMBOL(sock_common_setsockopt); |
2969 | ||
3fdadf7d | 2970 | #ifdef CONFIG_COMPAT |
543d9cfe | 2971 | int compat_sock_common_setsockopt(struct socket *sock, int level, int optname, |
b7058842 | 2972 | char __user *optval, unsigned int optlen) |
3fdadf7d DM |
2973 | { |
2974 | struct sock *sk = sock->sk; | |
2975 | ||
543d9cfe ACM |
2976 | if (sk->sk_prot->compat_setsockopt != NULL) |
2977 | return sk->sk_prot->compat_setsockopt(sk, level, optname, | |
2978 | optval, optlen); | |
3fdadf7d DM |
2979 | return sk->sk_prot->setsockopt(sk, level, optname, optval, optlen); |
2980 | } | |
2981 | EXPORT_SYMBOL(compat_sock_common_setsockopt); | |
2982 | #endif | |
2983 | ||
1da177e4 LT |
2984 | void sk_common_release(struct sock *sk) |
2985 | { | |
2986 | if (sk->sk_prot->destroy) | |
2987 | sk->sk_prot->destroy(sk); | |
2988 | ||
2989 | /* | |
2990 | * Observation: when sock_common_release is called, processes have | |
2991 | * no access to socket. But net still has. | |
2992 | * Step one, detach it from networking: | |
2993 | * | |
2994 | * A. Remove from hash tables. | |
2995 | */ | |
2996 | ||
2997 | sk->sk_prot->unhash(sk); | |
2998 | ||
2999 | /* | |
3000 | * In this point socket cannot receive new packets, but it is possible | |
3001 | * that some packets are in flight because some CPU runs receiver and | |
3002 | * did hash table lookup before we unhashed socket. They will achieve | |
3003 | * receive queue and will be purged by socket destructor. | |
3004 | * | |
3005 | * Also we still have packets pending on receive queue and probably, | |
3006 | * our own packets waiting in device queues. sock_destroy will drain | |
3007 | * receive queue, but transmitted packets will delay socket destruction | |
3008 | * until the last reference will be released. | |
3009 | */ | |
3010 | ||
3011 | sock_orphan(sk); | |
3012 | ||
3013 | xfrm_sk_free_policy(sk); | |
3014 | ||
e6848976 | 3015 | sk_refcnt_debug_release(sk); |
5640f768 | 3016 | |
1da177e4 LT |
3017 | sock_put(sk); |
3018 | } | |
1da177e4 LT |
3019 | EXPORT_SYMBOL(sk_common_release); |
3020 | ||
a2d133b1 JH |
3021 | void sk_get_meminfo(const struct sock *sk, u32 *mem) |
3022 | { | |
3023 | memset(mem, 0, sizeof(*mem) * SK_MEMINFO_VARS); | |
3024 | ||
3025 | mem[SK_MEMINFO_RMEM_ALLOC] = sk_rmem_alloc_get(sk); | |
3026 | mem[SK_MEMINFO_RCVBUF] = sk->sk_rcvbuf; | |
3027 | mem[SK_MEMINFO_WMEM_ALLOC] = sk_wmem_alloc_get(sk); | |
3028 | mem[SK_MEMINFO_SNDBUF] = sk->sk_sndbuf; | |
3029 | mem[SK_MEMINFO_FWD_ALLOC] = sk->sk_forward_alloc; | |
3030 | mem[SK_MEMINFO_WMEM_QUEUED] = sk->sk_wmem_queued; | |
3031 | mem[SK_MEMINFO_OPTMEM] = atomic_read(&sk->sk_omem_alloc); | |
3032 | mem[SK_MEMINFO_BACKLOG] = sk->sk_backlog.len; | |
3033 | mem[SK_MEMINFO_DROPS] = atomic_read(&sk->sk_drops); | |
3034 | } | |
3035 | ||
13ff3d6f PE |
3036 | #ifdef CONFIG_PROC_FS |
3037 | #define PROTO_INUSE_NR 64 /* should be enough for the first time */ | |
1338d466 PE |
3038 | struct prot_inuse { |
3039 | int val[PROTO_INUSE_NR]; | |
3040 | }; | |
13ff3d6f PE |
3041 | |
3042 | static DECLARE_BITMAP(proto_inuse_idx, PROTO_INUSE_NR); | |
70ee1159 PE |
3043 | |
3044 | #ifdef CONFIG_NET_NS | |
3045 | void sock_prot_inuse_add(struct net *net, struct proto *prot, int val) | |
3046 | { | |
d6d9ca0f | 3047 | __this_cpu_add(net->core.inuse->val[prot->inuse_idx], val); |
70ee1159 PE |
3048 | } |
3049 | EXPORT_SYMBOL_GPL(sock_prot_inuse_add); | |
3050 | ||
3051 | int sock_prot_inuse_get(struct net *net, struct proto *prot) | |
3052 | { | |
3053 | int cpu, idx = prot->inuse_idx; | |
3054 | int res = 0; | |
3055 | ||
3056 | for_each_possible_cpu(cpu) | |
3057 | res += per_cpu_ptr(net->core.inuse, cpu)->val[idx]; | |
3058 | ||
3059 | return res >= 0 ? res : 0; | |
3060 | } | |
3061 | EXPORT_SYMBOL_GPL(sock_prot_inuse_get); | |
3062 | ||
2c8c1e72 | 3063 | static int __net_init sock_inuse_init_net(struct net *net) |
70ee1159 PE |
3064 | { |
3065 | net->core.inuse = alloc_percpu(struct prot_inuse); | |
3066 | return net->core.inuse ? 0 : -ENOMEM; | |
3067 | } | |
3068 | ||
2c8c1e72 | 3069 | static void __net_exit sock_inuse_exit_net(struct net *net) |
70ee1159 PE |
3070 | { |
3071 | free_percpu(net->core.inuse); | |
3072 | } | |
3073 | ||
3074 | static struct pernet_operations net_inuse_ops = { | |
3075 | .init = sock_inuse_init_net, | |
3076 | .exit = sock_inuse_exit_net, | |
3077 | }; | |
3078 | ||
3079 | static __init int net_inuse_init(void) | |
3080 | { | |
3081 | if (register_pernet_subsys(&net_inuse_ops)) | |
3082 | panic("Cannot initialize net inuse counters"); | |
3083 | ||
3084 | return 0; | |
3085 | } | |
3086 | ||
3087 | core_initcall(net_inuse_init); | |
3088 | #else | |
1338d466 PE |
3089 | static DEFINE_PER_CPU(struct prot_inuse, prot_inuse); |
3090 | ||
c29a0bc4 | 3091 | void sock_prot_inuse_add(struct net *net, struct proto *prot, int val) |
1338d466 | 3092 | { |
d6d9ca0f | 3093 | __this_cpu_add(prot_inuse.val[prot->inuse_idx], val); |
1338d466 PE |
3094 | } |
3095 | EXPORT_SYMBOL_GPL(sock_prot_inuse_add); | |
3096 | ||
c29a0bc4 | 3097 | int sock_prot_inuse_get(struct net *net, struct proto *prot) |
1338d466 PE |
3098 | { |
3099 | int cpu, idx = prot->inuse_idx; | |
3100 | int res = 0; | |
3101 | ||
3102 | for_each_possible_cpu(cpu) | |
3103 | res += per_cpu(prot_inuse, cpu).val[idx]; | |
3104 | ||
3105 | return res >= 0 ? res : 0; | |
3106 | } | |
3107 | EXPORT_SYMBOL_GPL(sock_prot_inuse_get); | |
70ee1159 | 3108 | #endif |
13ff3d6f PE |
3109 | |
3110 | static void assign_proto_idx(struct proto *prot) | |
3111 | { | |
3112 | prot->inuse_idx = find_first_zero_bit(proto_inuse_idx, PROTO_INUSE_NR); | |
3113 | ||
3114 | if (unlikely(prot->inuse_idx == PROTO_INUSE_NR - 1)) { | |
e005d193 | 3115 | pr_err("PROTO_INUSE_NR exhausted\n"); |
13ff3d6f PE |
3116 | return; |
3117 | } | |
3118 | ||
3119 | set_bit(prot->inuse_idx, proto_inuse_idx); | |
3120 | } | |
3121 | ||
3122 | static void release_proto_idx(struct proto *prot) | |
3123 | { | |
3124 | if (prot->inuse_idx != PROTO_INUSE_NR - 1) | |
3125 | clear_bit(prot->inuse_idx, proto_inuse_idx); | |
3126 | } | |
3127 | #else | |
3128 | static inline void assign_proto_idx(struct proto *prot) | |
3129 | { | |
3130 | } | |
3131 | ||
3132 | static inline void release_proto_idx(struct proto *prot) | |
3133 | { | |
3134 | } | |
3135 | #endif | |
3136 | ||
0159dfd3 ED |
3137 | static void req_prot_cleanup(struct request_sock_ops *rsk_prot) |
3138 | { | |
3139 | if (!rsk_prot) | |
3140 | return; | |
3141 | kfree(rsk_prot->slab_name); | |
3142 | rsk_prot->slab_name = NULL; | |
adf78eda JL |
3143 | kmem_cache_destroy(rsk_prot->slab); |
3144 | rsk_prot->slab = NULL; | |
0159dfd3 ED |
3145 | } |
3146 | ||
3147 | static int req_prot_init(const struct proto *prot) | |
3148 | { | |
3149 | struct request_sock_ops *rsk_prot = prot->rsk_prot; | |
3150 | ||
3151 | if (!rsk_prot) | |
3152 | return 0; | |
3153 | ||
3154 | rsk_prot->slab_name = kasprintf(GFP_KERNEL, "request_sock_%s", | |
3155 | prot->name); | |
3156 | if (!rsk_prot->slab_name) | |
3157 | return -ENOMEM; | |
3158 | ||
3159 | rsk_prot->slab = kmem_cache_create(rsk_prot->slab_name, | |
3160 | rsk_prot->obj_size, 0, | |
e96f78ab | 3161 | prot->slab_flags, NULL); |
0159dfd3 ED |
3162 | |
3163 | if (!rsk_prot->slab) { | |
3164 | pr_crit("%s: Can't create request sock SLAB cache!\n", | |
3165 | prot->name); | |
3166 | return -ENOMEM; | |
3167 | } | |
3168 | return 0; | |
3169 | } | |
3170 | ||
b733c007 PE |
3171 | int proto_register(struct proto *prot, int alloc_slab) |
3172 | { | |
1da177e4 LT |
3173 | if (alloc_slab) { |
3174 | prot->slab = kmem_cache_create(prot->name, prot->obj_size, 0, | |
271b72c7 ED |
3175 | SLAB_HWCACHE_ALIGN | prot->slab_flags, |
3176 | NULL); | |
1da177e4 LT |
3177 | |
3178 | if (prot->slab == NULL) { | |
e005d193 JP |
3179 | pr_crit("%s: Can't create sock SLAB cache!\n", |
3180 | prot->name); | |
60e7663d | 3181 | goto out; |
1da177e4 | 3182 | } |
2e6599cb | 3183 | |
0159dfd3 ED |
3184 | if (req_prot_init(prot)) |
3185 | goto out_free_request_sock_slab; | |
8feaf0c0 | 3186 | |
6d6ee43e | 3187 | if (prot->twsk_prot != NULL) { |
faf23422 | 3188 | prot->twsk_prot->twsk_slab_name = kasprintf(GFP_KERNEL, "tw_sock_%s", prot->name); |
8feaf0c0 | 3189 | |
7e56b5d6 | 3190 | if (prot->twsk_prot->twsk_slab_name == NULL) |
8feaf0c0 ACM |
3191 | goto out_free_request_sock_slab; |
3192 | ||
6d6ee43e | 3193 | prot->twsk_prot->twsk_slab = |
7e56b5d6 | 3194 | kmem_cache_create(prot->twsk_prot->twsk_slab_name, |
6d6ee43e | 3195 | prot->twsk_prot->twsk_obj_size, |
3ab5aee7 | 3196 | 0, |
52db70dc | 3197 | prot->slab_flags, |
20c2df83 | 3198 | NULL); |
6d6ee43e | 3199 | if (prot->twsk_prot->twsk_slab == NULL) |
8feaf0c0 ACM |
3200 | goto out_free_timewait_sock_slab_name; |
3201 | } | |
1da177e4 LT |
3202 | } |
3203 | ||
36b77a52 | 3204 | mutex_lock(&proto_list_mutex); |
1da177e4 | 3205 | list_add(&prot->node, &proto_list); |
13ff3d6f | 3206 | assign_proto_idx(prot); |
36b77a52 | 3207 | mutex_unlock(&proto_list_mutex); |
b733c007 PE |
3208 | return 0; |
3209 | ||
8feaf0c0 | 3210 | out_free_timewait_sock_slab_name: |
7e56b5d6 | 3211 | kfree(prot->twsk_prot->twsk_slab_name); |
8feaf0c0 | 3212 | out_free_request_sock_slab: |
0159dfd3 ED |
3213 | req_prot_cleanup(prot->rsk_prot); |
3214 | ||
2e6599cb ACM |
3215 | kmem_cache_destroy(prot->slab); |
3216 | prot->slab = NULL; | |
b733c007 PE |
3217 | out: |
3218 | return -ENOBUFS; | |
1da177e4 | 3219 | } |
1da177e4 LT |
3220 | EXPORT_SYMBOL(proto_register); |
3221 | ||
3222 | void proto_unregister(struct proto *prot) | |
3223 | { | |
36b77a52 | 3224 | mutex_lock(&proto_list_mutex); |
13ff3d6f | 3225 | release_proto_idx(prot); |
0a3f4358 | 3226 | list_del(&prot->node); |
36b77a52 | 3227 | mutex_unlock(&proto_list_mutex); |
1da177e4 | 3228 | |
adf78eda JL |
3229 | kmem_cache_destroy(prot->slab); |
3230 | prot->slab = NULL; | |
1da177e4 | 3231 | |
0159dfd3 | 3232 | req_prot_cleanup(prot->rsk_prot); |
2e6599cb | 3233 | |
6d6ee43e | 3234 | if (prot->twsk_prot != NULL && prot->twsk_prot->twsk_slab != NULL) { |
6d6ee43e | 3235 | kmem_cache_destroy(prot->twsk_prot->twsk_slab); |
7e56b5d6 | 3236 | kfree(prot->twsk_prot->twsk_slab_name); |
6d6ee43e | 3237 | prot->twsk_prot->twsk_slab = NULL; |
8feaf0c0 | 3238 | } |
1da177e4 | 3239 | } |
1da177e4 LT |
3240 | EXPORT_SYMBOL(proto_unregister); |
3241 | ||
3242 | #ifdef CONFIG_PROC_FS | |
1da177e4 | 3243 | static void *proto_seq_start(struct seq_file *seq, loff_t *pos) |
36b77a52 | 3244 | __acquires(proto_list_mutex) |
1da177e4 | 3245 | { |
36b77a52 | 3246 | mutex_lock(&proto_list_mutex); |
60f0438a | 3247 | return seq_list_start_head(&proto_list, *pos); |
1da177e4 LT |
3248 | } |
3249 | ||
3250 | static void *proto_seq_next(struct seq_file *seq, void *v, loff_t *pos) | |
3251 | { | |
60f0438a | 3252 | return seq_list_next(v, &proto_list, pos); |
1da177e4 LT |
3253 | } |
3254 | ||
3255 | static void proto_seq_stop(struct seq_file *seq, void *v) | |
36b77a52 | 3256 | __releases(proto_list_mutex) |
1da177e4 | 3257 | { |
36b77a52 | 3258 | mutex_unlock(&proto_list_mutex); |
1da177e4 LT |
3259 | } |
3260 | ||
3261 | static char proto_method_implemented(const void *method) | |
3262 | { | |
3263 | return method == NULL ? 'n' : 'y'; | |
3264 | } | |
180d8cd9 GC |
3265 | static long sock_prot_memory_allocated(struct proto *proto) |
3266 | { | |
cb75a36c | 3267 | return proto->memory_allocated != NULL ? proto_memory_allocated(proto) : -1L; |
180d8cd9 GC |
3268 | } |
3269 | ||
3270 | static char *sock_prot_memory_pressure(struct proto *proto) | |
3271 | { | |
3272 | return proto->memory_pressure != NULL ? | |
3273 | proto_memory_pressure(proto) ? "yes" : "no" : "NI"; | |
3274 | } | |
1da177e4 LT |
3275 | |
3276 | static void proto_seq_printf(struct seq_file *seq, struct proto *proto) | |
3277 | { | |
180d8cd9 | 3278 | |
8d987e5c | 3279 | seq_printf(seq, "%-9s %4u %6d %6ld %-3s %6u %-3s %-10s " |
1da177e4 LT |
3280 | "%2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c\n", |
3281 | proto->name, | |
3282 | proto->obj_size, | |
14e943db | 3283 | sock_prot_inuse_get(seq_file_net(seq), proto), |
180d8cd9 GC |
3284 | sock_prot_memory_allocated(proto), |
3285 | sock_prot_memory_pressure(proto), | |
1da177e4 LT |
3286 | proto->max_header, |
3287 | proto->slab == NULL ? "no" : "yes", | |
3288 | module_name(proto->owner), | |
3289 | proto_method_implemented(proto->close), | |
3290 | proto_method_implemented(proto->connect), | |
3291 | proto_method_implemented(proto->disconnect), | |
3292 | proto_method_implemented(proto->accept), | |
3293 | proto_method_implemented(proto->ioctl), | |
3294 | proto_method_implemented(proto->init), | |
3295 | proto_method_implemented(proto->destroy), | |
3296 | proto_method_implemented(proto->shutdown), | |
3297 | proto_method_implemented(proto->setsockopt), | |
3298 | proto_method_implemented(proto->getsockopt), | |
3299 | proto_method_implemented(proto->sendmsg), | |
3300 | proto_method_implemented(proto->recvmsg), | |
3301 | proto_method_implemented(proto->sendpage), | |
3302 | proto_method_implemented(proto->bind), | |
3303 | proto_method_implemented(proto->backlog_rcv), | |
3304 | proto_method_implemented(proto->hash), | |
3305 | proto_method_implemented(proto->unhash), | |
3306 | proto_method_implemented(proto->get_port), | |
3307 | proto_method_implemented(proto->enter_memory_pressure)); | |
3308 | } | |
3309 | ||
3310 | static int proto_seq_show(struct seq_file *seq, void *v) | |
3311 | { | |
60f0438a | 3312 | if (v == &proto_list) |
1da177e4 LT |
3313 | seq_printf(seq, "%-9s %-4s %-8s %-6s %-5s %-7s %-4s %-10s %s", |
3314 | "protocol", | |
3315 | "size", | |
3316 | "sockets", | |
3317 | "memory", | |
3318 | "press", | |
3319 | "maxhdr", | |
3320 | "slab", | |
3321 | "module", | |
3322 | "cl co di ac io in de sh ss gs se re sp bi br ha uh gp em\n"); | |
3323 | else | |
60f0438a | 3324 | proto_seq_printf(seq, list_entry(v, struct proto, node)); |
1da177e4 LT |
3325 | return 0; |
3326 | } | |
3327 | ||
f690808e | 3328 | static const struct seq_operations proto_seq_ops = { |
1da177e4 LT |
3329 | .start = proto_seq_start, |
3330 | .next = proto_seq_next, | |
3331 | .stop = proto_seq_stop, | |
3332 | .show = proto_seq_show, | |
3333 | }; | |
3334 | ||
3335 | static int proto_seq_open(struct inode *inode, struct file *file) | |
3336 | { | |
14e943db ED |
3337 | return seq_open_net(inode, file, &proto_seq_ops, |
3338 | sizeof(struct seq_net_private)); | |
1da177e4 LT |
3339 | } |
3340 | ||
9a32144e | 3341 | static const struct file_operations proto_seq_fops = { |
1da177e4 LT |
3342 | .owner = THIS_MODULE, |
3343 | .open = proto_seq_open, | |
3344 | .read = seq_read, | |
3345 | .llseek = seq_lseek, | |
14e943db ED |
3346 | .release = seq_release_net, |
3347 | }; | |
3348 | ||
3349 | static __net_init int proto_init_net(struct net *net) | |
3350 | { | |
d4beaa66 | 3351 | if (!proc_create("protocols", S_IRUGO, net->proc_net, &proto_seq_fops)) |
14e943db ED |
3352 | return -ENOMEM; |
3353 | ||
3354 | return 0; | |
3355 | } | |
3356 | ||
3357 | static __net_exit void proto_exit_net(struct net *net) | |
3358 | { | |
ece31ffd | 3359 | remove_proc_entry("protocols", net->proc_net); |
14e943db ED |
3360 | } |
3361 | ||
3362 | ||
3363 | static __net_initdata struct pernet_operations proto_net_ops = { | |
3364 | .init = proto_init_net, | |
3365 | .exit = proto_exit_net, | |
1da177e4 LT |
3366 | }; |
3367 | ||
3368 | static int __init proto_init(void) | |
3369 | { | |
14e943db | 3370 | return register_pernet_subsys(&proto_net_ops); |
1da177e4 LT |
3371 | } |
3372 | ||
3373 | subsys_initcall(proto_init); | |
3374 | ||
3375 | #endif /* PROC_FS */ | |
7db6b048 SS |
3376 | |
3377 | #ifdef CONFIG_NET_RX_BUSY_POLL | |
3378 | bool sk_busy_loop_end(void *p, unsigned long start_time) | |
3379 | { | |
3380 | struct sock *sk = p; | |
3381 | ||
3382 | return !skb_queue_empty(&sk->sk_receive_queue) || | |
3383 | sk_busy_loop_timeout(sk, start_time); | |
3384 | } | |
3385 | EXPORT_SYMBOL(sk_busy_loop_end); | |
3386 | #endif /* CONFIG_NET_RX_BUSY_POLL */ |