Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * INET An implementation of the TCP/IP protocol suite for the LINUX | |
3 | * operating system. INET is implemented using the BSD Socket | |
4 | * interface as the means of communication with the user level. | |
5 | * | |
6 | * Generic socket support routines. Memory allocators, socket lock/release | |
7 | * handler for protocols to use and generic option handler. | |
8 | * | |
9 | * | |
02c30a84 | 10 | * Authors: Ross Biro |
1da177e4 LT |
11 | * Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG> |
12 | * Florian La Roche, <flla@stud.uni-sb.de> | |
13 | * Alan Cox, <A.Cox@swansea.ac.uk> | |
14 | * | |
15 | * Fixes: | |
16 | * Alan Cox : Numerous verify_area() problems | |
17 | * Alan Cox : Connecting on a connecting socket | |
18 | * now returns an error for tcp. | |
19 | * Alan Cox : sock->protocol is set correctly. | |
20 | * and is not sometimes left as 0. | |
21 | * Alan Cox : connect handles icmp errors on a | |
22 | * connect properly. Unfortunately there | |
23 | * is a restart syscall nasty there. I | |
24 | * can't match BSD without hacking the C | |
25 | * library. Ideas urgently sought! | |
26 | * Alan Cox : Disallow bind() to addresses that are | |
27 | * not ours - especially broadcast ones!! | |
28 | * Alan Cox : Socket 1024 _IS_ ok for users. (fencepost) | |
29 | * Alan Cox : sock_wfree/sock_rfree don't destroy sockets, | |
30 | * instead they leave that for the DESTROY timer. | |
31 | * Alan Cox : Clean up error flag in accept | |
32 | * Alan Cox : TCP ack handling is buggy, the DESTROY timer | |
33 | * was buggy. Put a remove_sock() in the handler | |
34 | * for memory when we hit 0. Also altered the timer | |
4ec93edb | 35 | * code. The ACK stuff can wait and needs major |
1da177e4 LT |
36 | * TCP layer surgery. |
37 | * Alan Cox : Fixed TCP ack bug, removed remove sock | |
38 | * and fixed timer/inet_bh race. | |
39 | * Alan Cox : Added zapped flag for TCP | |
40 | * Alan Cox : Move kfree_skb into skbuff.c and tidied up surplus code | |
41 | * Alan Cox : for new sk_buff allocations wmalloc/rmalloc now call alloc_skb | |
42 | * Alan Cox : kfree_s calls now are kfree_skbmem so we can track skb resources | |
43 | * Alan Cox : Supports socket option broadcast now as does udp. Packet and raw need fixing. | |
44 | * Alan Cox : Added RCVBUF,SNDBUF size setting. It suddenly occurred to me how easy it was so... | |
45 | * Rick Sladkey : Relaxed UDP rules for matching packets. | |
46 | * C.E.Hawkins : IFF_PROMISC/SIOCGHWADDR support | |
47 | * Pauline Middelink : identd support | |
48 | * Alan Cox : Fixed connect() taking signals I think. | |
49 | * Alan Cox : SO_LINGER supported | |
50 | * Alan Cox : Error reporting fixes | |
51 | * Anonymous : inet_create tidied up (sk->reuse setting) | |
52 | * Alan Cox : inet sockets don't set sk->type! | |
53 | * Alan Cox : Split socket option code | |
54 | * Alan Cox : Callbacks | |
55 | * Alan Cox : Nagle flag for Charles & Johannes stuff | |
56 | * Alex : Removed restriction on inet fioctl | |
57 | * Alan Cox : Splitting INET from NET core | |
58 | * Alan Cox : Fixed bogus SO_TYPE handling in getsockopt() | |
59 | * Adam Caldwell : Missing return in SO_DONTROUTE/SO_DEBUG code | |
60 | * Alan Cox : Split IP from generic code | |
61 | * Alan Cox : New kfree_skbmem() | |
62 | * Alan Cox : Make SO_DEBUG superuser only. | |
63 | * Alan Cox : Allow anyone to clear SO_DEBUG | |
64 | * (compatibility fix) | |
65 | * Alan Cox : Added optimistic memory grabbing for AF_UNIX throughput. | |
66 | * Alan Cox : Allocator for a socket is settable. | |
67 | * Alan Cox : SO_ERROR includes soft errors. | |
68 | * Alan Cox : Allow NULL arguments on some SO_ opts | |
69 | * Alan Cox : Generic socket allocation to make hooks | |
70 | * easier (suggested by Craig Metz). | |
71 | * Michael Pall : SO_ERROR returns positive errno again | |
72 | * Steve Whitehouse: Added default destructor to free | |
73 | * protocol private data. | |
74 | * Steve Whitehouse: Added various other default routines | |
75 | * common to several socket families. | |
76 | * Chris Evans : Call suser() check last on F_SETOWN | |
77 | * Jay Schulist : Added SO_ATTACH_FILTER and SO_DETACH_FILTER. | |
78 | * Andi Kleen : Add sock_kmalloc()/sock_kfree_s() | |
79 | * Andi Kleen : Fix write_space callback | |
80 | * Chris Evans : Security fixes - signedness again | |
81 | * Arnaldo C. Melo : cleanups, use skb_queue_purge | |
82 | * | |
83 | * To Fix: | |
84 | * | |
85 | * | |
86 | * This program is free software; you can redistribute it and/or | |
87 | * modify it under the terms of the GNU General Public License | |
88 | * as published by the Free Software Foundation; either version | |
89 | * 2 of the License, or (at your option) any later version. | |
90 | */ | |
91 | ||
e005d193 JP |
92 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
93 | ||
4fc268d2 | 94 | #include <linux/capability.h> |
1da177e4 | 95 | #include <linux/errno.h> |
cb820f8e | 96 | #include <linux/errqueue.h> |
1da177e4 LT |
97 | #include <linux/types.h> |
98 | #include <linux/socket.h> | |
99 | #include <linux/in.h> | |
100 | #include <linux/kernel.h> | |
1da177e4 LT |
101 | #include <linux/module.h> |
102 | #include <linux/proc_fs.h> | |
103 | #include <linux/seq_file.h> | |
104 | #include <linux/sched.h> | |
105 | #include <linux/timer.h> | |
106 | #include <linux/string.h> | |
107 | #include <linux/sockios.h> | |
108 | #include <linux/net.h> | |
109 | #include <linux/mm.h> | |
110 | #include <linux/slab.h> | |
111 | #include <linux/interrupt.h> | |
112 | #include <linux/poll.h> | |
113 | #include <linux/tcp.h> | |
114 | #include <linux/init.h> | |
a1f8e7f7 | 115 | #include <linux/highmem.h> |
3f551f94 | 116 | #include <linux/user_namespace.h> |
c5905afb | 117 | #include <linux/static_key.h> |
3969eb38 | 118 | #include <linux/memcontrol.h> |
8c1ae10d | 119 | #include <linux/prefetch.h> |
1da177e4 LT |
120 | |
121 | #include <asm/uaccess.h> | |
1da177e4 LT |
122 | |
123 | #include <linux/netdevice.h> | |
124 | #include <net/protocol.h> | |
125 | #include <linux/skbuff.h> | |
457c4cbc | 126 | #include <net/net_namespace.h> |
2e6599cb | 127 | #include <net/request_sock.h> |
1da177e4 | 128 | #include <net/sock.h> |
20d49473 | 129 | #include <linux/net_tstamp.h> |
1da177e4 LT |
130 | #include <net/xfrm.h> |
131 | #include <linux/ipsec.h> | |
f8451725 | 132 | #include <net/cls_cgroup.h> |
5bc1421e | 133 | #include <net/netprio_cgroup.h> |
1da177e4 LT |
134 | |
135 | #include <linux/filter.h> | |
136 | ||
3847ce32 SM |
137 | #include <trace/events/sock.h> |
138 | ||
1da177e4 LT |
139 | #ifdef CONFIG_INET |
140 | #include <net/tcp.h> | |
141 | #endif | |
142 | ||
076bb0c8 | 143 | #include <net/busy_poll.h> |
06021292 | 144 | |
36b77a52 | 145 | static DEFINE_MUTEX(proto_list_mutex); |
d1a4c0b3 GC |
146 | static LIST_HEAD(proto_list); |
147 | ||
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 | ||
196 | ||
c255a458 | 197 | #ifdef CONFIG_MEMCG_KMEM |
1d62e436 | 198 | int mem_cgroup_sockets_init(struct mem_cgroup *memcg, struct cgroup_subsys *ss) |
d1a4c0b3 GC |
199 | { |
200 | struct proto *proto; | |
201 | int ret = 0; | |
202 | ||
36b77a52 | 203 | mutex_lock(&proto_list_mutex); |
d1a4c0b3 GC |
204 | list_for_each_entry(proto, &proto_list, node) { |
205 | if (proto->init_cgroup) { | |
1d62e436 | 206 | ret = proto->init_cgroup(memcg, ss); |
d1a4c0b3 GC |
207 | if (ret) |
208 | goto out; | |
209 | } | |
210 | } | |
211 | ||
36b77a52 | 212 | mutex_unlock(&proto_list_mutex); |
d1a4c0b3 GC |
213 | return ret; |
214 | out: | |
215 | list_for_each_entry_continue_reverse(proto, &proto_list, node) | |
216 | if (proto->destroy_cgroup) | |
1d62e436 | 217 | proto->destroy_cgroup(memcg); |
36b77a52 | 218 | mutex_unlock(&proto_list_mutex); |
d1a4c0b3 GC |
219 | return ret; |
220 | } | |
221 | ||
1d62e436 | 222 | void mem_cgroup_sockets_destroy(struct mem_cgroup *memcg) |
d1a4c0b3 GC |
223 | { |
224 | struct proto *proto; | |
225 | ||
36b77a52 | 226 | mutex_lock(&proto_list_mutex); |
d1a4c0b3 GC |
227 | list_for_each_entry_reverse(proto, &proto_list, node) |
228 | if (proto->destroy_cgroup) | |
1d62e436 | 229 | proto->destroy_cgroup(memcg); |
36b77a52 | 230 | mutex_unlock(&proto_list_mutex); |
d1a4c0b3 GC |
231 | } |
232 | #endif | |
233 | ||
da21f24d IM |
234 | /* |
235 | * Each address family might have different locking rules, so we have | |
236 | * one slock key per address family: | |
237 | */ | |
a5b5bb9a IM |
238 | static struct lock_class_key af_family_keys[AF_MAX]; |
239 | static struct lock_class_key af_family_slock_keys[AF_MAX]; | |
240 | ||
cbda4eaf | 241 | #if defined(CONFIG_MEMCG_KMEM) |
c5905afb | 242 | struct static_key memcg_socket_limit_enabled; |
e1aab161 | 243 | EXPORT_SYMBOL(memcg_socket_limit_enabled); |
cbda4eaf | 244 | #endif |
e1aab161 | 245 | |
a5b5bb9a IM |
246 | /* |
247 | * Make lock validator output more readable. (we pre-construct these | |
248 | * strings build-time, so that runtime initialization of socket | |
249 | * locks is fast): | |
250 | */ | |
36cbd3dc | 251 | static const char *const af_family_key_strings[AF_MAX+1] = { |
a5b5bb9a IM |
252 | "sk_lock-AF_UNSPEC", "sk_lock-AF_UNIX" , "sk_lock-AF_INET" , |
253 | "sk_lock-AF_AX25" , "sk_lock-AF_IPX" , "sk_lock-AF_APPLETALK", | |
254 | "sk_lock-AF_NETROM", "sk_lock-AF_BRIDGE" , "sk_lock-AF_ATMPVC" , | |
255 | "sk_lock-AF_X25" , "sk_lock-AF_INET6" , "sk_lock-AF_ROSE" , | |
256 | "sk_lock-AF_DECnet", "sk_lock-AF_NETBEUI" , "sk_lock-AF_SECURITY" , | |
257 | "sk_lock-AF_KEY" , "sk_lock-AF_NETLINK" , "sk_lock-AF_PACKET" , | |
258 | "sk_lock-AF_ASH" , "sk_lock-AF_ECONET" , "sk_lock-AF_ATMSVC" , | |
cbd151bf | 259 | "sk_lock-AF_RDS" , "sk_lock-AF_SNA" , "sk_lock-AF_IRDA" , |
a5b5bb9a | 260 | "sk_lock-AF_PPPOX" , "sk_lock-AF_WANPIPE" , "sk_lock-AF_LLC" , |
cd05acfe | 261 | "sk_lock-27" , "sk_lock-28" , "sk_lock-AF_CAN" , |
17926a79 | 262 | "sk_lock-AF_TIPC" , "sk_lock-AF_BLUETOOTH", "sk_lock-IUCV" , |
bce7b154 | 263 | "sk_lock-AF_RXRPC" , "sk_lock-AF_ISDN" , "sk_lock-AF_PHONET" , |
6f107b58 | 264 | "sk_lock-AF_IEEE802154", "sk_lock-AF_CAIF" , "sk_lock-AF_ALG" , |
456db6a4 | 265 | "sk_lock-AF_NFC" , "sk_lock-AF_VSOCK" , "sk_lock-AF_MAX" |
a5b5bb9a | 266 | }; |
36cbd3dc | 267 | static const char *const af_family_slock_key_strings[AF_MAX+1] = { |
a5b5bb9a IM |
268 | "slock-AF_UNSPEC", "slock-AF_UNIX" , "slock-AF_INET" , |
269 | "slock-AF_AX25" , "slock-AF_IPX" , "slock-AF_APPLETALK", | |
270 | "slock-AF_NETROM", "slock-AF_BRIDGE" , "slock-AF_ATMPVC" , | |
271 | "slock-AF_X25" , "slock-AF_INET6" , "slock-AF_ROSE" , | |
272 | "slock-AF_DECnet", "slock-AF_NETBEUI" , "slock-AF_SECURITY" , | |
273 | "slock-AF_KEY" , "slock-AF_NETLINK" , "slock-AF_PACKET" , | |
274 | "slock-AF_ASH" , "slock-AF_ECONET" , "slock-AF_ATMSVC" , | |
cbd151bf | 275 | "slock-AF_RDS" , "slock-AF_SNA" , "slock-AF_IRDA" , |
a5b5bb9a | 276 | "slock-AF_PPPOX" , "slock-AF_WANPIPE" , "slock-AF_LLC" , |
cd05acfe | 277 | "slock-27" , "slock-28" , "slock-AF_CAN" , |
17926a79 | 278 | "slock-AF_TIPC" , "slock-AF_BLUETOOTH", "slock-AF_IUCV" , |
bce7b154 | 279 | "slock-AF_RXRPC" , "slock-AF_ISDN" , "slock-AF_PHONET" , |
6f107b58 | 280 | "slock-AF_IEEE802154", "slock-AF_CAIF" , "slock-AF_ALG" , |
456db6a4 | 281 | "slock-AF_NFC" , "slock-AF_VSOCK" ,"slock-AF_MAX" |
a5b5bb9a | 282 | }; |
36cbd3dc | 283 | static const char *const af_family_clock_key_strings[AF_MAX+1] = { |
443aef0e PZ |
284 | "clock-AF_UNSPEC", "clock-AF_UNIX" , "clock-AF_INET" , |
285 | "clock-AF_AX25" , "clock-AF_IPX" , "clock-AF_APPLETALK", | |
286 | "clock-AF_NETROM", "clock-AF_BRIDGE" , "clock-AF_ATMPVC" , | |
287 | "clock-AF_X25" , "clock-AF_INET6" , "clock-AF_ROSE" , | |
288 | "clock-AF_DECnet", "clock-AF_NETBEUI" , "clock-AF_SECURITY" , | |
289 | "clock-AF_KEY" , "clock-AF_NETLINK" , "clock-AF_PACKET" , | |
290 | "clock-AF_ASH" , "clock-AF_ECONET" , "clock-AF_ATMSVC" , | |
cbd151bf | 291 | "clock-AF_RDS" , "clock-AF_SNA" , "clock-AF_IRDA" , |
443aef0e | 292 | "clock-AF_PPPOX" , "clock-AF_WANPIPE" , "clock-AF_LLC" , |
b4942af6 | 293 | "clock-27" , "clock-28" , "clock-AF_CAN" , |
e51f802b | 294 | "clock-AF_TIPC" , "clock-AF_BLUETOOTH", "clock-AF_IUCV" , |
bce7b154 | 295 | "clock-AF_RXRPC" , "clock-AF_ISDN" , "clock-AF_PHONET" , |
6f107b58 | 296 | "clock-AF_IEEE802154", "clock-AF_CAIF" , "clock-AF_ALG" , |
456db6a4 | 297 | "clock-AF_NFC" , "clock-AF_VSOCK" , "clock-AF_MAX" |
443aef0e | 298 | }; |
da21f24d IM |
299 | |
300 | /* | |
301 | * sk_callback_lock locking rules are per-address-family, | |
302 | * so split the lock classes by using a per-AF key: | |
303 | */ | |
304 | static struct lock_class_key af_callback_keys[AF_MAX]; | |
305 | ||
1da177e4 LT |
306 | /* Take into consideration the size of the struct sk_buff overhead in the |
307 | * determination of these values, since that is non-constant across | |
308 | * platforms. This makes socket queueing behavior and performance | |
309 | * not depend upon such differences. | |
310 | */ | |
311 | #define _SK_MEM_PACKETS 256 | |
87fb4b7b | 312 | #define _SK_MEM_OVERHEAD SKB_TRUESIZE(256) |
1da177e4 LT |
313 | #define SK_WMEM_MAX (_SK_MEM_OVERHEAD * _SK_MEM_PACKETS) |
314 | #define SK_RMEM_MAX (_SK_MEM_OVERHEAD * _SK_MEM_PACKETS) | |
315 | ||
316 | /* Run time adjustable parameters. */ | |
ab32ea5d | 317 | __u32 sysctl_wmem_max __read_mostly = SK_WMEM_MAX; |
6d8ebc8a | 318 | EXPORT_SYMBOL(sysctl_wmem_max); |
ab32ea5d | 319 | __u32 sysctl_rmem_max __read_mostly = SK_RMEM_MAX; |
6d8ebc8a | 320 | EXPORT_SYMBOL(sysctl_rmem_max); |
ab32ea5d BH |
321 | __u32 sysctl_wmem_default __read_mostly = SK_WMEM_MAX; |
322 | __u32 sysctl_rmem_default __read_mostly = SK_RMEM_MAX; | |
1da177e4 | 323 | |
25985edc | 324 | /* Maximal space eaten by iovec or ancillary data plus some space */ |
ab32ea5d | 325 | int sysctl_optmem_max __read_mostly = sizeof(unsigned long)*(2*UIO_MAXIOV+512); |
2a91525c | 326 | EXPORT_SYMBOL(sysctl_optmem_max); |
1da177e4 | 327 | |
b245be1f WB |
328 | int sysctl_tstamp_allow_data __read_mostly = 1; |
329 | ||
c93bdd0e MG |
330 | struct static_key memalloc_socks = STATIC_KEY_INIT_FALSE; |
331 | EXPORT_SYMBOL_GPL(memalloc_socks); | |
332 | ||
7cb02404 MG |
333 | /** |
334 | * sk_set_memalloc - sets %SOCK_MEMALLOC | |
335 | * @sk: socket to set it on | |
336 | * | |
337 | * Set %SOCK_MEMALLOC on a socket for access to emergency reserves. | |
338 | * It's the responsibility of the admin to adjust min_free_kbytes | |
339 | * to meet the requirements | |
340 | */ | |
341 | void sk_set_memalloc(struct sock *sk) | |
342 | { | |
343 | sock_set_flag(sk, SOCK_MEMALLOC); | |
344 | sk->sk_allocation |= __GFP_MEMALLOC; | |
c93bdd0e | 345 | static_key_slow_inc(&memalloc_socks); |
7cb02404 MG |
346 | } |
347 | EXPORT_SYMBOL_GPL(sk_set_memalloc); | |
348 | ||
349 | void sk_clear_memalloc(struct sock *sk) | |
350 | { | |
351 | sock_reset_flag(sk, SOCK_MEMALLOC); | |
352 | sk->sk_allocation &= ~__GFP_MEMALLOC; | |
c93bdd0e | 353 | static_key_slow_dec(&memalloc_socks); |
c76562b6 MG |
354 | |
355 | /* | |
356 | * SOCK_MEMALLOC is allowed to ignore rmem limits to ensure forward | |
357 | * progress of swapping. However, if SOCK_MEMALLOC is cleared while | |
358 | * it has rmem allocations there is a risk that the user of the | |
359 | * socket cannot make forward progress due to exceeding the rmem | |
360 | * limits. By rights, sk_clear_memalloc() should only be called | |
361 | * on sockets being torn down but warn and reset the accounting if | |
362 | * that assumption breaks. | |
363 | */ | |
364 | if (WARN_ON(sk->sk_forward_alloc)) | |
365 | sk_mem_reclaim(sk); | |
7cb02404 MG |
366 | } |
367 | EXPORT_SYMBOL_GPL(sk_clear_memalloc); | |
368 | ||
b4b9e355 MG |
369 | int __sk_backlog_rcv(struct sock *sk, struct sk_buff *skb) |
370 | { | |
371 | int ret; | |
372 | unsigned long pflags = current->flags; | |
373 | ||
374 | /* these should have been dropped before queueing */ | |
375 | BUG_ON(!sock_flag(sk, SOCK_MEMALLOC)); | |
376 | ||
377 | current->flags |= PF_MEMALLOC; | |
378 | ret = sk->sk_backlog_rcv(sk, skb); | |
379 | tsk_restore_flags(current, pflags, PF_MEMALLOC); | |
380 | ||
381 | return ret; | |
382 | } | |
383 | EXPORT_SYMBOL(__sk_backlog_rcv); | |
384 | ||
1da177e4 LT |
385 | static int sock_set_timeout(long *timeo_p, char __user *optval, int optlen) |
386 | { | |
387 | struct timeval tv; | |
388 | ||
389 | if (optlen < sizeof(tv)) | |
390 | return -EINVAL; | |
391 | if (copy_from_user(&tv, optval, sizeof(tv))) | |
392 | return -EFAULT; | |
ba78073e VA |
393 | if (tv.tv_usec < 0 || tv.tv_usec >= USEC_PER_SEC) |
394 | return -EDOM; | |
1da177e4 | 395 | |
ba78073e | 396 | if (tv.tv_sec < 0) { |
6f11df83 AM |
397 | static int warned __read_mostly; |
398 | ||
ba78073e | 399 | *timeo_p = 0; |
50aab54f | 400 | if (warned < 10 && net_ratelimit()) { |
ba78073e | 401 | warned++; |
e005d193 JP |
402 | pr_info("%s: `%s' (pid %d) tries to set negative timeout\n", |
403 | __func__, current->comm, task_pid_nr(current)); | |
50aab54f | 404 | } |
ba78073e VA |
405 | return 0; |
406 | } | |
1da177e4 LT |
407 | *timeo_p = MAX_SCHEDULE_TIMEOUT; |
408 | if (tv.tv_sec == 0 && tv.tv_usec == 0) | |
409 | return 0; | |
410 | if (tv.tv_sec < (MAX_SCHEDULE_TIMEOUT/HZ - 1)) | |
411 | *timeo_p = tv.tv_sec*HZ + (tv.tv_usec+(1000000/HZ-1))/(1000000/HZ); | |
412 | return 0; | |
413 | } | |
414 | ||
415 | static void sock_warn_obsolete_bsdism(const char *name) | |
416 | { | |
417 | static int warned; | |
418 | static char warncomm[TASK_COMM_LEN]; | |
4ec93edb YH |
419 | if (strcmp(warncomm, current->comm) && warned < 5) { |
420 | strcpy(warncomm, current->comm); | |
e005d193 JP |
421 | pr_warn("process `%s' is using obsolete %s SO_BSDCOMPAT\n", |
422 | warncomm, name); | |
1da177e4 LT |
423 | warned++; |
424 | } | |
425 | } | |
426 | ||
08e29af3 ED |
427 | #define SK_FLAGS_TIMESTAMP ((1UL << SOCK_TIMESTAMP) | (1UL << SOCK_TIMESTAMPING_RX_SOFTWARE)) |
428 | ||
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; | |
433 | if (!(sk->sk_flags & SK_FLAGS_TIMESTAMP)) | |
20d49473 | 434 | net_disable_timestamp(); |
1da177e4 LT |
435 | } |
436 | } | |
437 | ||
438 | ||
f0088a50 DV |
439 | int sock_queue_rcv_skb(struct sock *sk, struct sk_buff *skb) |
440 | { | |
766e9037 | 441 | int err; |
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 | ||
fda9ef5d | 451 | err = sk_filter(sk, skb); |
f0088a50 | 452 | if (err) |
766e9037 | 453 | return err; |
f0088a50 | 454 | |
c76562b6 | 455 | if (!sk_rmem_schedule(sk, skb, skb->truesize)) { |
766e9037 ED |
456 | atomic_inc(&sk->sk_drops); |
457 | return -ENOBUFS; | |
3ab224be HA |
458 | } |
459 | ||
f0088a50 DV |
460 | skb->dev = NULL; |
461 | skb_set_owner_r(skb, sk); | |
49ad9599 | 462 | |
7fee226a ED |
463 | /* we escape from rcu protected region, make sure we dont leak |
464 | * a norefcounted dst | |
465 | */ | |
466 | skb_dst_force(skb); | |
467 | ||
3b885787 | 468 | spin_lock_irqsave(&list->lock, flags); |
3bc3b96f | 469 | sock_skb_set_dropcount(sk, skb); |
3b885787 NH |
470 | __skb_queue_tail(list, skb); |
471 | spin_unlock_irqrestore(&list->lock, flags); | |
f0088a50 DV |
472 | |
473 | if (!sock_flag(sk, SOCK_DEAD)) | |
676d2369 | 474 | sk->sk_data_ready(sk); |
766e9037 | 475 | return 0; |
f0088a50 DV |
476 | } |
477 | EXPORT_SYMBOL(sock_queue_rcv_skb); | |
478 | ||
58a5a7b9 | 479 | int sk_receive_skb(struct sock *sk, struct sk_buff *skb, const int nested) |
f0088a50 DV |
480 | { |
481 | int rc = NET_RX_SUCCESS; | |
482 | ||
fda9ef5d | 483 | if (sk_filter(sk, skb)) |
f0088a50 DV |
484 | goto discard_and_relse; |
485 | ||
486 | skb->dev = NULL; | |
487 | ||
274f482d | 488 | if (sk_rcvqueues_full(sk, sk->sk_rcvbuf)) { |
c377411f ED |
489 | atomic_inc(&sk->sk_drops); |
490 | goto discard_and_relse; | |
491 | } | |
58a5a7b9 ACM |
492 | if (nested) |
493 | bh_lock_sock_nested(sk); | |
494 | else | |
495 | bh_lock_sock(sk); | |
a5b5bb9a IM |
496 | if (!sock_owned_by_user(sk)) { |
497 | /* | |
498 | * trylock + unlock semantics: | |
499 | */ | |
500 | mutex_acquire(&sk->sk_lock.dep_map, 0, 1, _RET_IP_); | |
501 | ||
c57943a1 | 502 | rc = sk_backlog_rcv(sk, skb); |
a5b5bb9a IM |
503 | |
504 | mutex_release(&sk->sk_lock.dep_map, 1, _RET_IP_); | |
f545a38f | 505 | } else if (sk_add_backlog(sk, skb, sk->sk_rcvbuf)) { |
8eae939f ZY |
506 | bh_unlock_sock(sk); |
507 | atomic_inc(&sk->sk_drops); | |
508 | goto discard_and_relse; | |
509 | } | |
510 | ||
f0088a50 DV |
511 | bh_unlock_sock(sk); |
512 | out: | |
513 | sock_put(sk); | |
514 | return rc; | |
515 | discard_and_relse: | |
516 | kfree_skb(skb); | |
517 | goto out; | |
518 | } | |
519 | EXPORT_SYMBOL(sk_receive_skb); | |
520 | ||
521 | struct dst_entry *__sk_dst_check(struct sock *sk, u32 cookie) | |
522 | { | |
b6c6712a | 523 | struct dst_entry *dst = __sk_dst_get(sk); |
f0088a50 DV |
524 | |
525 | if (dst && dst->obsolete && dst->ops->check(dst, cookie) == NULL) { | |
e022f0b4 | 526 | sk_tx_queue_clear(sk); |
a9b3cd7f | 527 | RCU_INIT_POINTER(sk->sk_dst_cache, NULL); |
f0088a50 DV |
528 | dst_release(dst); |
529 | return NULL; | |
530 | } | |
531 | ||
532 | return dst; | |
533 | } | |
534 | EXPORT_SYMBOL(__sk_dst_check); | |
535 | ||
536 | struct dst_entry *sk_dst_check(struct sock *sk, u32 cookie) | |
537 | { | |
538 | struct dst_entry *dst = sk_dst_get(sk); | |
539 | ||
540 | if (dst && dst->obsolete && dst->ops->check(dst, cookie) == NULL) { | |
541 | sk_dst_reset(sk); | |
542 | dst_release(dst); | |
543 | return NULL; | |
544 | } | |
545 | ||
546 | return dst; | |
547 | } | |
548 | EXPORT_SYMBOL(sk_dst_check); | |
549 | ||
c91f6df2 BH |
550 | static int sock_setbindtodevice(struct sock *sk, char __user *optval, |
551 | int optlen) | |
4878809f DM |
552 | { |
553 | int ret = -ENOPROTOOPT; | |
554 | #ifdef CONFIG_NETDEVICES | |
3b1e0a65 | 555 | struct net *net = sock_net(sk); |
4878809f DM |
556 | char devname[IFNAMSIZ]; |
557 | int index; | |
558 | ||
559 | /* Sorry... */ | |
560 | ret = -EPERM; | |
5e1fccc0 | 561 | if (!ns_capable(net->user_ns, CAP_NET_RAW)) |
4878809f DM |
562 | goto out; |
563 | ||
564 | ret = -EINVAL; | |
565 | if (optlen < 0) | |
566 | goto out; | |
567 | ||
568 | /* Bind this socket to a particular device like "eth0", | |
569 | * as specified in the passed interface name. If the | |
570 | * name is "" or the option length is zero the socket | |
571 | * is not bound. | |
572 | */ | |
573 | if (optlen > IFNAMSIZ - 1) | |
574 | optlen = IFNAMSIZ - 1; | |
575 | memset(devname, 0, sizeof(devname)); | |
576 | ||
577 | ret = -EFAULT; | |
578 | if (copy_from_user(devname, optval, optlen)) | |
579 | goto out; | |
580 | ||
000ba2e4 DM |
581 | index = 0; |
582 | if (devname[0] != '\0') { | |
bf8e56bf | 583 | struct net_device *dev; |
4878809f | 584 | |
bf8e56bf ED |
585 | rcu_read_lock(); |
586 | dev = dev_get_by_name_rcu(net, devname); | |
587 | if (dev) | |
588 | index = dev->ifindex; | |
589 | rcu_read_unlock(); | |
4878809f DM |
590 | ret = -ENODEV; |
591 | if (!dev) | |
592 | goto out; | |
4878809f DM |
593 | } |
594 | ||
595 | lock_sock(sk); | |
596 | sk->sk_bound_dev_if = index; | |
597 | sk_dst_reset(sk); | |
598 | release_sock(sk); | |
599 | ||
600 | ret = 0; | |
601 | ||
602 | out: | |
603 | #endif | |
604 | ||
605 | return ret; | |
606 | } | |
607 | ||
c91f6df2 BH |
608 | static int sock_getbindtodevice(struct sock *sk, char __user *optval, |
609 | int __user *optlen, int len) | |
610 | { | |
611 | int ret = -ENOPROTOOPT; | |
612 | #ifdef CONFIG_NETDEVICES | |
613 | struct net *net = sock_net(sk); | |
c91f6df2 | 614 | char devname[IFNAMSIZ]; |
c91f6df2 BH |
615 | |
616 | if (sk->sk_bound_dev_if == 0) { | |
617 | len = 0; | |
618 | goto zero; | |
619 | } | |
620 | ||
621 | ret = -EINVAL; | |
622 | if (len < IFNAMSIZ) | |
623 | goto out; | |
624 | ||
5dbe7c17 NS |
625 | ret = netdev_get_name(net, devname, sk->sk_bound_dev_if); |
626 | if (ret) | |
c91f6df2 | 627 | goto out; |
c91f6df2 BH |
628 | |
629 | len = strlen(devname) + 1; | |
630 | ||
631 | ret = -EFAULT; | |
632 | if (copy_to_user(optval, devname, len)) | |
633 | goto out; | |
634 | ||
635 | zero: | |
636 | ret = -EFAULT; | |
637 | if (put_user(len, optlen)) | |
638 | goto out; | |
639 | ||
640 | ret = 0; | |
641 | ||
642 | out: | |
643 | #endif | |
644 | ||
645 | return ret; | |
646 | } | |
647 | ||
c0ef877b PE |
648 | static inline void sock_valbool_flag(struct sock *sk, int bit, int valbool) |
649 | { | |
650 | if (valbool) | |
651 | sock_set_flag(sk, bit); | |
652 | else | |
653 | sock_reset_flag(sk, bit); | |
654 | } | |
655 | ||
f60e5990 | 656 | bool sk_mc_loop(struct sock *sk) |
657 | { | |
658 | if (dev_recursion_level()) | |
659 | return false; | |
660 | if (!sk) | |
661 | return true; | |
662 | switch (sk->sk_family) { | |
663 | case AF_INET: | |
664 | return inet_sk(sk)->mc_loop; | |
665 | #if IS_ENABLED(CONFIG_IPV6) | |
666 | case AF_INET6: | |
667 | return inet6_sk(sk)->mc_loop; | |
668 | #endif | |
669 | } | |
670 | WARN_ON(1); | |
671 | return true; | |
672 | } | |
673 | EXPORT_SYMBOL(sk_mc_loop); | |
674 | ||
1da177e4 LT |
675 | /* |
676 | * This is meant for all protocols to use and covers goings on | |
677 | * at the socket level. Everything here is generic. | |
678 | */ | |
679 | ||
680 | int sock_setsockopt(struct socket *sock, int level, int optname, | |
b7058842 | 681 | char __user *optval, unsigned int optlen) |
1da177e4 | 682 | { |
2a91525c | 683 | struct sock *sk = sock->sk; |
1da177e4 LT |
684 | int val; |
685 | int valbool; | |
686 | struct linger ling; | |
687 | int ret = 0; | |
4ec93edb | 688 | |
1da177e4 LT |
689 | /* |
690 | * Options without arguments | |
691 | */ | |
692 | ||
4878809f | 693 | if (optname == SO_BINDTODEVICE) |
c91f6df2 | 694 | return sock_setbindtodevice(sk, optval, optlen); |
4878809f | 695 | |
e71a4783 SH |
696 | if (optlen < sizeof(int)) |
697 | return -EINVAL; | |
4ec93edb | 698 | |
1da177e4 LT |
699 | if (get_user(val, (int __user *)optval)) |
700 | return -EFAULT; | |
4ec93edb | 701 | |
2a91525c | 702 | valbool = val ? 1 : 0; |
1da177e4 LT |
703 | |
704 | lock_sock(sk); | |
705 | ||
2a91525c | 706 | switch (optname) { |
e71a4783 | 707 | case SO_DEBUG: |
2a91525c | 708 | if (val && !capable(CAP_NET_ADMIN)) |
e71a4783 | 709 | ret = -EACCES; |
2a91525c | 710 | else |
c0ef877b | 711 | sock_valbool_flag(sk, SOCK_DBG, valbool); |
e71a4783 SH |
712 | break; |
713 | case SO_REUSEADDR: | |
4a17fd52 | 714 | sk->sk_reuse = (valbool ? SK_CAN_REUSE : SK_NO_REUSE); |
e71a4783 | 715 | break; |
055dc21a TH |
716 | case SO_REUSEPORT: |
717 | sk->sk_reuseport = valbool; | |
718 | break; | |
e71a4783 | 719 | case SO_TYPE: |
49c794e9 | 720 | case SO_PROTOCOL: |
0d6038ee | 721 | case SO_DOMAIN: |
e71a4783 SH |
722 | case SO_ERROR: |
723 | ret = -ENOPROTOOPT; | |
724 | break; | |
725 | case SO_DONTROUTE: | |
c0ef877b | 726 | sock_valbool_flag(sk, SOCK_LOCALROUTE, valbool); |
e71a4783 SH |
727 | break; |
728 | case SO_BROADCAST: | |
729 | sock_valbool_flag(sk, SOCK_BROADCAST, valbool); | |
730 | break; | |
731 | case SO_SNDBUF: | |
732 | /* Don't error on this BSD doesn't and if you think | |
82981930 ED |
733 | * about it this is right. Otherwise apps have to |
734 | * play 'guess the biggest size' games. RCVBUF/SNDBUF | |
735 | * are treated in BSD as hints | |
736 | */ | |
737 | val = min_t(u32, val, sysctl_wmem_max); | |
b0573dea | 738 | set_sndbuf: |
e71a4783 | 739 | sk->sk_userlocks |= SOCK_SNDBUF_LOCK; |
82981930 ED |
740 | sk->sk_sndbuf = max_t(u32, val * 2, SOCK_MIN_SNDBUF); |
741 | /* Wake up sending tasks if we upped the value. */ | |
e71a4783 SH |
742 | sk->sk_write_space(sk); |
743 | break; | |
1da177e4 | 744 | |
e71a4783 SH |
745 | case SO_SNDBUFFORCE: |
746 | if (!capable(CAP_NET_ADMIN)) { | |
747 | ret = -EPERM; | |
748 | break; | |
749 | } | |
750 | goto set_sndbuf; | |
b0573dea | 751 | |
e71a4783 SH |
752 | case SO_RCVBUF: |
753 | /* Don't error on this BSD doesn't and if you think | |
82981930 ED |
754 | * about it this is right. Otherwise apps have to |
755 | * play 'guess the biggest size' games. RCVBUF/SNDBUF | |
756 | * are treated in BSD as hints | |
757 | */ | |
758 | val = min_t(u32, val, sysctl_rmem_max); | |
b0573dea | 759 | set_rcvbuf: |
e71a4783 SH |
760 | sk->sk_userlocks |= SOCK_RCVBUF_LOCK; |
761 | /* | |
762 | * We double it on the way in to account for | |
763 | * "struct sk_buff" etc. overhead. Applications | |
764 | * assume that the SO_RCVBUF setting they make will | |
765 | * allow that much actual data to be received on that | |
766 | * socket. | |
767 | * | |
768 | * Applications are unaware that "struct sk_buff" and | |
769 | * other overheads allocate from the receive buffer | |
770 | * during socket buffer allocation. | |
771 | * | |
772 | * And after considering the possible alternatives, | |
773 | * returning the value we actually used in getsockopt | |
774 | * is the most desirable behavior. | |
775 | */ | |
82981930 | 776 | sk->sk_rcvbuf = max_t(u32, val * 2, SOCK_MIN_RCVBUF); |
e71a4783 SH |
777 | break; |
778 | ||
779 | case SO_RCVBUFFORCE: | |
780 | if (!capable(CAP_NET_ADMIN)) { | |
781 | ret = -EPERM; | |
1da177e4 | 782 | break; |
e71a4783 SH |
783 | } |
784 | goto set_rcvbuf; | |
1da177e4 | 785 | |
e71a4783 | 786 | case SO_KEEPALIVE: |
1da177e4 | 787 | #ifdef CONFIG_INET |
3e10986d ED |
788 | if (sk->sk_protocol == IPPROTO_TCP && |
789 | sk->sk_type == SOCK_STREAM) | |
e71a4783 | 790 | tcp_set_keepalive(sk, valbool); |
1da177e4 | 791 | #endif |
e71a4783 SH |
792 | sock_valbool_flag(sk, SOCK_KEEPOPEN, valbool); |
793 | break; | |
794 | ||
795 | case SO_OOBINLINE: | |
796 | sock_valbool_flag(sk, SOCK_URGINLINE, valbool); | |
797 | break; | |
798 | ||
799 | case SO_NO_CHECK: | |
28448b80 | 800 | sk->sk_no_check_tx = valbool; |
e71a4783 SH |
801 | break; |
802 | ||
803 | case SO_PRIORITY: | |
5e1fccc0 EB |
804 | if ((val >= 0 && val <= 6) || |
805 | ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN)) | |
e71a4783 SH |
806 | sk->sk_priority = val; |
807 | else | |
808 | ret = -EPERM; | |
809 | break; | |
810 | ||
811 | case SO_LINGER: | |
812 | if (optlen < sizeof(ling)) { | |
813 | ret = -EINVAL; /* 1003.1g */ | |
1da177e4 | 814 | break; |
e71a4783 | 815 | } |
2a91525c | 816 | if (copy_from_user(&ling, optval, sizeof(ling))) { |
e71a4783 | 817 | ret = -EFAULT; |
1da177e4 | 818 | break; |
e71a4783 SH |
819 | } |
820 | if (!ling.l_onoff) | |
821 | sock_reset_flag(sk, SOCK_LINGER); | |
822 | else { | |
1da177e4 | 823 | #if (BITS_PER_LONG == 32) |
e71a4783 SH |
824 | if ((unsigned int)ling.l_linger >= MAX_SCHEDULE_TIMEOUT/HZ) |
825 | sk->sk_lingertime = MAX_SCHEDULE_TIMEOUT; | |
1da177e4 | 826 | else |
e71a4783 SH |
827 | #endif |
828 | sk->sk_lingertime = (unsigned int)ling.l_linger * HZ; | |
829 | sock_set_flag(sk, SOCK_LINGER); | |
830 | } | |
831 | break; | |
832 | ||
833 | case SO_BSDCOMPAT: | |
834 | sock_warn_obsolete_bsdism("setsockopt"); | |
835 | break; | |
836 | ||
837 | case SO_PASSCRED: | |
838 | if (valbool) | |
839 | set_bit(SOCK_PASSCRED, &sock->flags); | |
840 | else | |
841 | clear_bit(SOCK_PASSCRED, &sock->flags); | |
842 | break; | |
843 | ||
844 | case SO_TIMESTAMP: | |
92f37fd2 | 845 | case SO_TIMESTAMPNS: |
e71a4783 | 846 | if (valbool) { |
92f37fd2 ED |
847 | if (optname == SO_TIMESTAMP) |
848 | sock_reset_flag(sk, SOCK_RCVTSTAMPNS); | |
849 | else | |
850 | sock_set_flag(sk, SOCK_RCVTSTAMPNS); | |
e71a4783 | 851 | sock_set_flag(sk, SOCK_RCVTSTAMP); |
20d49473 | 852 | sock_enable_timestamp(sk, SOCK_TIMESTAMP); |
92f37fd2 | 853 | } else { |
e71a4783 | 854 | sock_reset_flag(sk, SOCK_RCVTSTAMP); |
92f37fd2 ED |
855 | sock_reset_flag(sk, SOCK_RCVTSTAMPNS); |
856 | } | |
e71a4783 SH |
857 | break; |
858 | ||
20d49473 PO |
859 | case SO_TIMESTAMPING: |
860 | if (val & ~SOF_TIMESTAMPING_MASK) { | |
f249fb78 | 861 | ret = -EINVAL; |
20d49473 PO |
862 | break; |
863 | } | |
b245be1f | 864 | |
09c2d251 | 865 | if (val & SOF_TIMESTAMPING_OPT_ID && |
4ed2d765 WB |
866 | !(sk->sk_tsflags & SOF_TIMESTAMPING_OPT_ID)) { |
867 | if (sk->sk_protocol == IPPROTO_TCP) { | |
868 | if (sk->sk_state != TCP_ESTABLISHED) { | |
869 | ret = -EINVAL; | |
870 | break; | |
871 | } | |
872 | sk->sk_tskey = tcp_sk(sk)->snd_una; | |
873 | } else { | |
874 | sk->sk_tskey = 0; | |
875 | } | |
876 | } | |
b9f40e21 | 877 | sk->sk_tsflags = val; |
20d49473 PO |
878 | if (val & SOF_TIMESTAMPING_RX_SOFTWARE) |
879 | sock_enable_timestamp(sk, | |
880 | SOCK_TIMESTAMPING_RX_SOFTWARE); | |
881 | else | |
882 | sock_disable_timestamp(sk, | |
08e29af3 | 883 | (1UL << SOCK_TIMESTAMPING_RX_SOFTWARE)); |
20d49473 PO |
884 | break; |
885 | ||
e71a4783 SH |
886 | case SO_RCVLOWAT: |
887 | if (val < 0) | |
888 | val = INT_MAX; | |
889 | sk->sk_rcvlowat = val ? : 1; | |
890 | break; | |
891 | ||
892 | case SO_RCVTIMEO: | |
893 | ret = sock_set_timeout(&sk->sk_rcvtimeo, optval, optlen); | |
894 | break; | |
895 | ||
896 | case SO_SNDTIMEO: | |
897 | ret = sock_set_timeout(&sk->sk_sndtimeo, optval, optlen); | |
898 | break; | |
1da177e4 | 899 | |
e71a4783 SH |
900 | case SO_ATTACH_FILTER: |
901 | ret = -EINVAL; | |
902 | if (optlen == sizeof(struct sock_fprog)) { | |
903 | struct sock_fprog fprog; | |
1da177e4 | 904 | |
e71a4783 SH |
905 | ret = -EFAULT; |
906 | if (copy_from_user(&fprog, optval, sizeof(fprog))) | |
1da177e4 | 907 | break; |
e71a4783 SH |
908 | |
909 | ret = sk_attach_filter(&fprog, sk); | |
910 | } | |
911 | break; | |
912 | ||
89aa0758 AS |
913 | case SO_ATTACH_BPF: |
914 | ret = -EINVAL; | |
915 | if (optlen == sizeof(u32)) { | |
916 | u32 ufd; | |
917 | ||
918 | ret = -EFAULT; | |
919 | if (copy_from_user(&ufd, optval, sizeof(ufd))) | |
920 | break; | |
921 | ||
922 | ret = sk_attach_bpf(ufd, sk); | |
923 | } | |
924 | break; | |
925 | ||
e71a4783 | 926 | case SO_DETACH_FILTER: |
55b33325 | 927 | ret = sk_detach_filter(sk); |
e71a4783 | 928 | break; |
1da177e4 | 929 | |
d59577b6 VB |
930 | case SO_LOCK_FILTER: |
931 | if (sock_flag(sk, SOCK_FILTER_LOCKED) && !valbool) | |
932 | ret = -EPERM; | |
933 | else | |
934 | sock_valbool_flag(sk, SOCK_FILTER_LOCKED, valbool); | |
935 | break; | |
936 | ||
e71a4783 SH |
937 | case SO_PASSSEC: |
938 | if (valbool) | |
939 | set_bit(SOCK_PASSSEC, &sock->flags); | |
940 | else | |
941 | clear_bit(SOCK_PASSSEC, &sock->flags); | |
942 | break; | |
4a19ec58 | 943 | case SO_MARK: |
5e1fccc0 | 944 | if (!ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN)) |
4a19ec58 | 945 | ret = -EPERM; |
2a91525c | 946 | else |
4a19ec58 | 947 | sk->sk_mark = val; |
4a19ec58 | 948 | break; |
877ce7c1 | 949 | |
3b885787 | 950 | case SO_RXQ_OVFL: |
8083f0fc | 951 | sock_valbool_flag(sk, SOCK_RXQ_OVFL, valbool); |
3b885787 | 952 | break; |
6e3e939f JB |
953 | |
954 | case SO_WIFI_STATUS: | |
955 | sock_valbool_flag(sk, SOCK_WIFI_STATUS, valbool); | |
956 | break; | |
957 | ||
ef64a54f PE |
958 | case SO_PEEK_OFF: |
959 | if (sock->ops->set_peek_off) | |
12663bfc | 960 | ret = sock->ops->set_peek_off(sk, val); |
ef64a54f PE |
961 | else |
962 | ret = -EOPNOTSUPP; | |
963 | break; | |
3bdc0eba BG |
964 | |
965 | case SO_NOFCS: | |
966 | sock_valbool_flag(sk, SOCK_NOFCS, valbool); | |
967 | break; | |
968 | ||
7d4c04fc KJ |
969 | case SO_SELECT_ERR_QUEUE: |
970 | sock_valbool_flag(sk, SOCK_SELECT_ERR_QUEUE, valbool); | |
971 | break; | |
972 | ||
e0d1095a | 973 | #ifdef CONFIG_NET_RX_BUSY_POLL |
64b0dc51 | 974 | case SO_BUSY_POLL: |
dafcc438 ET |
975 | /* allow unprivileged users to decrease the value */ |
976 | if ((val > sk->sk_ll_usec) && !capable(CAP_NET_ADMIN)) | |
977 | ret = -EPERM; | |
978 | else { | |
979 | if (val < 0) | |
980 | ret = -EINVAL; | |
981 | else | |
982 | sk->sk_ll_usec = val; | |
983 | } | |
984 | break; | |
985 | #endif | |
62748f32 ED |
986 | |
987 | case SO_MAX_PACING_RATE: | |
988 | sk->sk_max_pacing_rate = val; | |
989 | sk->sk_pacing_rate = min(sk->sk_pacing_rate, | |
990 | sk->sk_max_pacing_rate); | |
991 | break; | |
992 | ||
e71a4783 SH |
993 | default: |
994 | ret = -ENOPROTOOPT; | |
995 | break; | |
4ec93edb | 996 | } |
1da177e4 LT |
997 | release_sock(sk); |
998 | return ret; | |
999 | } | |
2a91525c | 1000 | EXPORT_SYMBOL(sock_setsockopt); |
1da177e4 LT |
1001 | |
1002 | ||
8f09898b | 1003 | static void cred_to_ucred(struct pid *pid, const struct cred *cred, |
1004 | struct ucred *ucred) | |
3f551f94 EB |
1005 | { |
1006 | ucred->pid = pid_vnr(pid); | |
1007 | ucred->uid = ucred->gid = -1; | |
1008 | if (cred) { | |
1009 | struct user_namespace *current_ns = current_user_ns(); | |
1010 | ||
b2e4f544 EB |
1011 | ucred->uid = from_kuid_munged(current_ns, cred->euid); |
1012 | ucred->gid = from_kgid_munged(current_ns, cred->egid); | |
3f551f94 EB |
1013 | } |
1014 | } | |
1015 | ||
1da177e4 LT |
1016 | int sock_getsockopt(struct socket *sock, int level, int optname, |
1017 | char __user *optval, int __user *optlen) | |
1018 | { | |
1019 | struct sock *sk = sock->sk; | |
4ec93edb | 1020 | |
e71a4783 | 1021 | union { |
4ec93edb YH |
1022 | int val; |
1023 | struct linger ling; | |
1da177e4 LT |
1024 | struct timeval tm; |
1025 | } v; | |
4ec93edb | 1026 | |
4d0392be | 1027 | int lv = sizeof(int); |
1da177e4 | 1028 | int len; |
4ec93edb | 1029 | |
e71a4783 | 1030 | if (get_user(len, optlen)) |
4ec93edb | 1031 | return -EFAULT; |
e71a4783 | 1032 | if (len < 0) |
1da177e4 | 1033 | return -EINVAL; |
4ec93edb | 1034 | |
50fee1de | 1035 | memset(&v, 0, sizeof(v)); |
df0bca04 | 1036 | |
2a91525c | 1037 | switch (optname) { |
e71a4783 SH |
1038 | case SO_DEBUG: |
1039 | v.val = sock_flag(sk, SOCK_DBG); | |
1040 | break; | |
1041 | ||
1042 | case SO_DONTROUTE: | |
1043 | v.val = sock_flag(sk, SOCK_LOCALROUTE); | |
1044 | break; | |
1045 | ||
1046 | case SO_BROADCAST: | |
1b23a5df | 1047 | v.val = sock_flag(sk, SOCK_BROADCAST); |
e71a4783 SH |
1048 | break; |
1049 | ||
1050 | case SO_SNDBUF: | |
1051 | v.val = sk->sk_sndbuf; | |
1052 | break; | |
1053 | ||
1054 | case SO_RCVBUF: | |
1055 | v.val = sk->sk_rcvbuf; | |
1056 | break; | |
1057 | ||
1058 | case SO_REUSEADDR: | |
1059 | v.val = sk->sk_reuse; | |
1060 | break; | |
1061 | ||
055dc21a TH |
1062 | case SO_REUSEPORT: |
1063 | v.val = sk->sk_reuseport; | |
1064 | break; | |
1065 | ||
e71a4783 | 1066 | case SO_KEEPALIVE: |
1b23a5df | 1067 | v.val = sock_flag(sk, SOCK_KEEPOPEN); |
e71a4783 SH |
1068 | break; |
1069 | ||
1070 | case SO_TYPE: | |
1071 | v.val = sk->sk_type; | |
1072 | break; | |
1073 | ||
49c794e9 JE |
1074 | case SO_PROTOCOL: |
1075 | v.val = sk->sk_protocol; | |
1076 | break; | |
1077 | ||
0d6038ee JE |
1078 | case SO_DOMAIN: |
1079 | v.val = sk->sk_family; | |
1080 | break; | |
1081 | ||
e71a4783 SH |
1082 | case SO_ERROR: |
1083 | v.val = -sock_error(sk); | |
2a91525c | 1084 | if (v.val == 0) |
e71a4783 SH |
1085 | v.val = xchg(&sk->sk_err_soft, 0); |
1086 | break; | |
1087 | ||
1088 | case SO_OOBINLINE: | |
1b23a5df | 1089 | v.val = sock_flag(sk, SOCK_URGINLINE); |
e71a4783 SH |
1090 | break; |
1091 | ||
1092 | case SO_NO_CHECK: | |
28448b80 | 1093 | v.val = sk->sk_no_check_tx; |
e71a4783 SH |
1094 | break; |
1095 | ||
1096 | case SO_PRIORITY: | |
1097 | v.val = sk->sk_priority; | |
1098 | break; | |
1099 | ||
1100 | case SO_LINGER: | |
1101 | lv = sizeof(v.ling); | |
1b23a5df | 1102 | v.ling.l_onoff = sock_flag(sk, SOCK_LINGER); |
e71a4783 SH |
1103 | v.ling.l_linger = sk->sk_lingertime / HZ; |
1104 | break; | |
1105 | ||
1106 | case SO_BSDCOMPAT: | |
1107 | sock_warn_obsolete_bsdism("getsockopt"); | |
1108 | break; | |
1109 | ||
1110 | case SO_TIMESTAMP: | |
92f37fd2 ED |
1111 | v.val = sock_flag(sk, SOCK_RCVTSTAMP) && |
1112 | !sock_flag(sk, SOCK_RCVTSTAMPNS); | |
1113 | break; | |
1114 | ||
1115 | case SO_TIMESTAMPNS: | |
1116 | v.val = sock_flag(sk, SOCK_RCVTSTAMPNS); | |
e71a4783 SH |
1117 | break; |
1118 | ||
20d49473 | 1119 | case SO_TIMESTAMPING: |
b9f40e21 | 1120 | v.val = sk->sk_tsflags; |
20d49473 PO |
1121 | break; |
1122 | ||
e71a4783 | 1123 | case SO_RCVTIMEO: |
2a91525c | 1124 | lv = sizeof(struct timeval); |
e71a4783 SH |
1125 | if (sk->sk_rcvtimeo == MAX_SCHEDULE_TIMEOUT) { |
1126 | v.tm.tv_sec = 0; | |
1127 | v.tm.tv_usec = 0; | |
1128 | } else { | |
1129 | v.tm.tv_sec = sk->sk_rcvtimeo / HZ; | |
1130 | v.tm.tv_usec = ((sk->sk_rcvtimeo % HZ) * 1000000) / HZ; | |
1131 | } | |
1132 | break; | |
1133 | ||
1134 | case SO_SNDTIMEO: | |
2a91525c | 1135 | lv = sizeof(struct timeval); |
e71a4783 SH |
1136 | if (sk->sk_sndtimeo == MAX_SCHEDULE_TIMEOUT) { |
1137 | v.tm.tv_sec = 0; | |
1138 | v.tm.tv_usec = 0; | |
1139 | } else { | |
1140 | v.tm.tv_sec = sk->sk_sndtimeo / HZ; | |
1141 | v.tm.tv_usec = ((sk->sk_sndtimeo % HZ) * 1000000) / HZ; | |
1142 | } | |
1143 | break; | |
1da177e4 | 1144 | |
e71a4783 SH |
1145 | case SO_RCVLOWAT: |
1146 | v.val = sk->sk_rcvlowat; | |
1147 | break; | |
1da177e4 | 1148 | |
e71a4783 | 1149 | case SO_SNDLOWAT: |
2a91525c | 1150 | v.val = 1; |
e71a4783 | 1151 | break; |
1da177e4 | 1152 | |
e71a4783 | 1153 | case SO_PASSCRED: |
82981930 | 1154 | v.val = !!test_bit(SOCK_PASSCRED, &sock->flags); |
e71a4783 | 1155 | break; |
1da177e4 | 1156 | |
e71a4783 | 1157 | case SO_PEERCRED: |
109f6e39 EB |
1158 | { |
1159 | struct ucred peercred; | |
1160 | if (len > sizeof(peercred)) | |
1161 | len = sizeof(peercred); | |
1162 | cred_to_ucred(sk->sk_peer_pid, sk->sk_peer_cred, &peercred); | |
1163 | if (copy_to_user(optval, &peercred, len)) | |
e71a4783 SH |
1164 | return -EFAULT; |
1165 | goto lenout; | |
109f6e39 | 1166 | } |
1da177e4 | 1167 | |
e71a4783 SH |
1168 | case SO_PEERNAME: |
1169 | { | |
1170 | char address[128]; | |
1171 | ||
1172 | if (sock->ops->getname(sock, (struct sockaddr *)address, &lv, 2)) | |
1173 | return -ENOTCONN; | |
1174 | if (lv < len) | |
1175 | return -EINVAL; | |
1176 | if (copy_to_user(optval, address, len)) | |
1177 | return -EFAULT; | |
1178 | goto lenout; | |
1179 | } | |
1da177e4 | 1180 | |
e71a4783 SH |
1181 | /* Dubious BSD thing... Probably nobody even uses it, but |
1182 | * the UNIX standard wants it for whatever reason... -DaveM | |
1183 | */ | |
1184 | case SO_ACCEPTCONN: | |
1185 | v.val = sk->sk_state == TCP_LISTEN; | |
1186 | break; | |
1da177e4 | 1187 | |
e71a4783 | 1188 | case SO_PASSSEC: |
82981930 | 1189 | v.val = !!test_bit(SOCK_PASSSEC, &sock->flags); |
e71a4783 | 1190 | break; |
877ce7c1 | 1191 | |
e71a4783 SH |
1192 | case SO_PEERSEC: |
1193 | return security_socket_getpeersec_stream(sock, optval, optlen, len); | |
1da177e4 | 1194 | |
4a19ec58 LAT |
1195 | case SO_MARK: |
1196 | v.val = sk->sk_mark; | |
1197 | break; | |
1198 | ||
3b885787 | 1199 | case SO_RXQ_OVFL: |
1b23a5df | 1200 | v.val = sock_flag(sk, SOCK_RXQ_OVFL); |
3b885787 NH |
1201 | break; |
1202 | ||
6e3e939f | 1203 | case SO_WIFI_STATUS: |
1b23a5df | 1204 | v.val = sock_flag(sk, SOCK_WIFI_STATUS); |
6e3e939f JB |
1205 | break; |
1206 | ||
ef64a54f PE |
1207 | case SO_PEEK_OFF: |
1208 | if (!sock->ops->set_peek_off) | |
1209 | return -EOPNOTSUPP; | |
1210 | ||
1211 | v.val = sk->sk_peek_off; | |
1212 | break; | |
bc2f7996 | 1213 | case SO_NOFCS: |
1b23a5df | 1214 | v.val = sock_flag(sk, SOCK_NOFCS); |
bc2f7996 | 1215 | break; |
c91f6df2 | 1216 | |
f7b86bfe | 1217 | case SO_BINDTODEVICE: |
c91f6df2 BH |
1218 | return sock_getbindtodevice(sk, optval, optlen, len); |
1219 | ||
a8fc9277 PE |
1220 | case SO_GET_FILTER: |
1221 | len = sk_get_filter(sk, (struct sock_filter __user *)optval, len); | |
1222 | if (len < 0) | |
1223 | return len; | |
1224 | ||
1225 | goto lenout; | |
c91f6df2 | 1226 | |
d59577b6 VB |
1227 | case SO_LOCK_FILTER: |
1228 | v.val = sock_flag(sk, SOCK_FILTER_LOCKED); | |
1229 | break; | |
1230 | ||
ea02f941 MS |
1231 | case SO_BPF_EXTENSIONS: |
1232 | v.val = bpf_tell_extensions(); | |
1233 | break; | |
1234 | ||
7d4c04fc KJ |
1235 | case SO_SELECT_ERR_QUEUE: |
1236 | v.val = sock_flag(sk, SOCK_SELECT_ERR_QUEUE); | |
1237 | break; | |
1238 | ||
e0d1095a | 1239 | #ifdef CONFIG_NET_RX_BUSY_POLL |
64b0dc51 | 1240 | case SO_BUSY_POLL: |
dafcc438 ET |
1241 | v.val = sk->sk_ll_usec; |
1242 | break; | |
1243 | #endif | |
1244 | ||
62748f32 ED |
1245 | case SO_MAX_PACING_RATE: |
1246 | v.val = sk->sk_max_pacing_rate; | |
1247 | break; | |
1248 | ||
2c8c56e1 ED |
1249 | case SO_INCOMING_CPU: |
1250 | v.val = sk->sk_incoming_cpu; | |
1251 | break; | |
1252 | ||
e71a4783 | 1253 | default: |
443b5991 YH |
1254 | /* We implement the SO_SNDLOWAT etc to not be settable |
1255 | * (1003.1g 7). | |
1256 | */ | |
e71a4783 | 1257 | return -ENOPROTOOPT; |
1da177e4 | 1258 | } |
e71a4783 | 1259 | |
1da177e4 LT |
1260 | if (len > lv) |
1261 | len = lv; | |
1262 | if (copy_to_user(optval, &v, len)) | |
1263 | return -EFAULT; | |
1264 | lenout: | |
4ec93edb YH |
1265 | if (put_user(len, optlen)) |
1266 | return -EFAULT; | |
1267 | return 0; | |
1da177e4 LT |
1268 | } |
1269 | ||
a5b5bb9a IM |
1270 | /* |
1271 | * Initialize an sk_lock. | |
1272 | * | |
1273 | * (We also register the sk_lock with the lock validator.) | |
1274 | */ | |
b6f99a21 | 1275 | static inline void sock_lock_init(struct sock *sk) |
a5b5bb9a | 1276 | { |
ed07536e PZ |
1277 | sock_lock_init_class_and_name(sk, |
1278 | af_family_slock_key_strings[sk->sk_family], | |
1279 | af_family_slock_keys + sk->sk_family, | |
1280 | af_family_key_strings[sk->sk_family], | |
1281 | af_family_keys + sk->sk_family); | |
a5b5bb9a IM |
1282 | } |
1283 | ||
4dc6dc71 ED |
1284 | /* |
1285 | * Copy all fields from osk to nsk but nsk->sk_refcnt must not change yet, | |
1286 | * even temporarly, because of RCU lookups. sk_node should also be left as is. | |
68835aba | 1287 | * We must not copy fields between sk_dontcopy_begin and sk_dontcopy_end |
4dc6dc71 | 1288 | */ |
f1a6c4da PE |
1289 | static void sock_copy(struct sock *nsk, const struct sock *osk) |
1290 | { | |
1291 | #ifdef CONFIG_SECURITY_NETWORK | |
1292 | void *sptr = nsk->sk_security; | |
1293 | #endif | |
68835aba ED |
1294 | memcpy(nsk, osk, offsetof(struct sock, sk_dontcopy_begin)); |
1295 | ||
1296 | memcpy(&nsk->sk_dontcopy_end, &osk->sk_dontcopy_end, | |
1297 | osk->sk_prot->obj_size - offsetof(struct sock, sk_dontcopy_end)); | |
1298 | ||
f1a6c4da PE |
1299 | #ifdef CONFIG_SECURITY_NETWORK |
1300 | nsk->sk_security = sptr; | |
1301 | security_sk_clone(osk, nsk); | |
1302 | #endif | |
1303 | } | |
1304 | ||
fcbdf09d OP |
1305 | void sk_prot_clear_portaddr_nulls(struct sock *sk, int size) |
1306 | { | |
1307 | unsigned long nulls1, nulls2; | |
1308 | ||
1309 | nulls1 = offsetof(struct sock, __sk_common.skc_node.next); | |
1310 | nulls2 = offsetof(struct sock, __sk_common.skc_portaddr_node.next); | |
1311 | if (nulls1 > nulls2) | |
1312 | swap(nulls1, nulls2); | |
1313 | ||
1314 | if (nulls1 != 0) | |
1315 | memset((char *)sk, 0, nulls1); | |
1316 | memset((char *)sk + nulls1 + sizeof(void *), 0, | |
1317 | nulls2 - nulls1 - sizeof(void *)); | |
1318 | memset((char *)sk + nulls2 + sizeof(void *), 0, | |
1319 | size - nulls2 - sizeof(void *)); | |
1320 | } | |
1321 | EXPORT_SYMBOL(sk_prot_clear_portaddr_nulls); | |
1322 | ||
2e4afe7b PE |
1323 | static struct sock *sk_prot_alloc(struct proto *prot, gfp_t priority, |
1324 | int family) | |
c308c1b2 PE |
1325 | { |
1326 | struct sock *sk; | |
1327 | struct kmem_cache *slab; | |
1328 | ||
1329 | slab = prot->slab; | |
e912b114 ED |
1330 | if (slab != NULL) { |
1331 | sk = kmem_cache_alloc(slab, priority & ~__GFP_ZERO); | |
1332 | if (!sk) | |
1333 | return sk; | |
1334 | if (priority & __GFP_ZERO) { | |
fcbdf09d OP |
1335 | if (prot->clear_sk) |
1336 | prot->clear_sk(sk, prot->obj_size); | |
1337 | else | |
1338 | sk_prot_clear_nulls(sk, prot->obj_size); | |
e912b114 | 1339 | } |
fcbdf09d | 1340 | } else |
c308c1b2 PE |
1341 | sk = kmalloc(prot->obj_size, priority); |
1342 | ||
2e4afe7b | 1343 | if (sk != NULL) { |
a98b65a3 VN |
1344 | kmemcheck_annotate_bitfield(sk, flags); |
1345 | ||
2e4afe7b PE |
1346 | if (security_sk_alloc(sk, family, priority)) |
1347 | goto out_free; | |
1348 | ||
1349 | if (!try_module_get(prot->owner)) | |
1350 | goto out_free_sec; | |
e022f0b4 | 1351 | sk_tx_queue_clear(sk); |
2e4afe7b PE |
1352 | } |
1353 | ||
c308c1b2 | 1354 | return sk; |
2e4afe7b PE |
1355 | |
1356 | out_free_sec: | |
1357 | security_sk_free(sk); | |
1358 | out_free: | |
1359 | if (slab != NULL) | |
1360 | kmem_cache_free(slab, sk); | |
1361 | else | |
1362 | kfree(sk); | |
1363 | return NULL; | |
c308c1b2 PE |
1364 | } |
1365 | ||
1366 | static void sk_prot_free(struct proto *prot, struct sock *sk) | |
1367 | { | |
1368 | struct kmem_cache *slab; | |
2e4afe7b | 1369 | struct module *owner; |
c308c1b2 | 1370 | |
2e4afe7b | 1371 | owner = prot->owner; |
c308c1b2 | 1372 | slab = prot->slab; |
2e4afe7b PE |
1373 | |
1374 | security_sk_free(sk); | |
c308c1b2 PE |
1375 | if (slab != NULL) |
1376 | kmem_cache_free(slab, sk); | |
1377 | else | |
1378 | kfree(sk); | |
2e4afe7b | 1379 | module_put(owner); |
c308c1b2 PE |
1380 | } |
1381 | ||
86f8515f | 1382 | #if IS_ENABLED(CONFIG_CGROUP_NET_PRIO) |
6ffd4641 | 1383 | void sock_update_netprioidx(struct sock *sk) |
5bc1421e | 1384 | { |
5bc1421e NH |
1385 | if (in_interrupt()) |
1386 | return; | |
2b73bc65 | 1387 | |
6ffd4641 | 1388 | sk->sk_cgrp_prioidx = task_netprioidx(current); |
5bc1421e NH |
1389 | } |
1390 | EXPORT_SYMBOL_GPL(sock_update_netprioidx); | |
f8451725 HX |
1391 | #endif |
1392 | ||
1da177e4 LT |
1393 | /** |
1394 | * sk_alloc - All socket objects are allocated here | |
c4ea43c5 | 1395 | * @net: the applicable net namespace |
4dc3b16b PP |
1396 | * @family: protocol family |
1397 | * @priority: for allocation (%GFP_KERNEL, %GFP_ATOMIC, etc) | |
1398 | * @prot: struct proto associated with this new sock instance | |
11aa9c28 | 1399 | * @kern: is this to be a kernel socket? |
1da177e4 | 1400 | */ |
1b8d7ae4 | 1401 | struct sock *sk_alloc(struct net *net, int family, gfp_t priority, |
11aa9c28 | 1402 | struct proto *prot, int kern) |
1da177e4 | 1403 | { |
c308c1b2 | 1404 | struct sock *sk; |
1da177e4 | 1405 | |
154adbc8 | 1406 | sk = sk_prot_alloc(prot, priority | __GFP_ZERO, family); |
1da177e4 | 1407 | if (sk) { |
154adbc8 PE |
1408 | sk->sk_family = family; |
1409 | /* | |
1410 | * See comment in struct sock definition to understand | |
1411 | * why we need sk_prot_creator -acme | |
1412 | */ | |
1413 | sk->sk_prot = sk->sk_prot_creator = prot; | |
1414 | sock_lock_init(sk); | |
26abe143 EB |
1415 | sk->sk_net_refcnt = kern ? 0 : 1; |
1416 | if (likely(sk->sk_net_refcnt)) | |
1417 | get_net(net); | |
1418 | sock_net_set(sk, net); | |
d66ee058 | 1419 | atomic_set(&sk->sk_wmem_alloc, 1); |
f8451725 | 1420 | |
211d2f97 | 1421 | sock_update_classid(sk); |
6ffd4641 | 1422 | sock_update_netprioidx(sk); |
1da177e4 | 1423 | } |
a79af59e | 1424 | |
2e4afe7b | 1425 | return sk; |
1da177e4 | 1426 | } |
2a91525c | 1427 | EXPORT_SYMBOL(sk_alloc); |
1da177e4 | 1428 | |
2b85a34e | 1429 | static void __sk_free(struct sock *sk) |
1da177e4 LT |
1430 | { |
1431 | struct sk_filter *filter; | |
1da177e4 LT |
1432 | |
1433 | if (sk->sk_destruct) | |
1434 | sk->sk_destruct(sk); | |
1435 | ||
a898def2 PM |
1436 | filter = rcu_dereference_check(sk->sk_filter, |
1437 | atomic_read(&sk->sk_wmem_alloc) == 0); | |
1da177e4 | 1438 | if (filter) { |
309dd5fc | 1439 | sk_filter_uncharge(sk, filter); |
a9b3cd7f | 1440 | RCU_INIT_POINTER(sk->sk_filter, NULL); |
1da177e4 LT |
1441 | } |
1442 | ||
08e29af3 | 1443 | sock_disable_timestamp(sk, SK_FLAGS_TIMESTAMP); |
1da177e4 LT |
1444 | |
1445 | if (atomic_read(&sk->sk_omem_alloc)) | |
e005d193 JP |
1446 | pr_debug("%s: optmem leakage (%d bytes) detected\n", |
1447 | __func__, atomic_read(&sk->sk_omem_alloc)); | |
1da177e4 | 1448 | |
109f6e39 EB |
1449 | if (sk->sk_peer_cred) |
1450 | put_cred(sk->sk_peer_cred); | |
1451 | put_pid(sk->sk_peer_pid); | |
26abe143 EB |
1452 | if (likely(sk->sk_net_refcnt)) |
1453 | put_net(sock_net(sk)); | |
c308c1b2 | 1454 | sk_prot_free(sk->sk_prot_creator, sk); |
1da177e4 | 1455 | } |
2b85a34e ED |
1456 | |
1457 | void sk_free(struct sock *sk) | |
1458 | { | |
1459 | /* | |
25985edc | 1460 | * We subtract one from sk_wmem_alloc and can know if |
2b85a34e ED |
1461 | * some packets are still in some tx queue. |
1462 | * If not null, sock_wfree() will call __sk_free(sk) later | |
1463 | */ | |
1464 | if (atomic_dec_and_test(&sk->sk_wmem_alloc)) | |
1465 | __sk_free(sk); | |
1466 | } | |
2a91525c | 1467 | EXPORT_SYMBOL(sk_free); |
1da177e4 | 1468 | |
475f1b52 SR |
1469 | static void sk_update_clone(const struct sock *sk, struct sock *newsk) |
1470 | { | |
1471 | if (mem_cgroup_sockets_enabled && sk->sk_cgrp) | |
1472 | sock_update_memcg(newsk); | |
1473 | } | |
1474 | ||
e56c57d0 ED |
1475 | /** |
1476 | * sk_clone_lock - clone a socket, and lock its clone | |
1477 | * @sk: the socket to clone | |
1478 | * @priority: for allocation (%GFP_KERNEL, %GFP_ATOMIC, etc) | |
1479 | * | |
1480 | * Caller must unlock socket even in error path (bh_unlock_sock(newsk)) | |
1481 | */ | |
1482 | struct sock *sk_clone_lock(const struct sock *sk, const gfp_t priority) | |
87d11ceb | 1483 | { |
8fd1d178 | 1484 | struct sock *newsk; |
278571ba | 1485 | bool is_charged = true; |
87d11ceb | 1486 | |
8fd1d178 | 1487 | newsk = sk_prot_alloc(sk->sk_prot, priority, sk->sk_family); |
87d11ceb ACM |
1488 | if (newsk != NULL) { |
1489 | struct sk_filter *filter; | |
1490 | ||
892c141e | 1491 | sock_copy(newsk, sk); |
87d11ceb ACM |
1492 | |
1493 | /* SANITY */ | |
3b1e0a65 | 1494 | get_net(sock_net(newsk)); |
87d11ceb ACM |
1495 | sk_node_init(&newsk->sk_node); |
1496 | sock_lock_init(newsk); | |
1497 | bh_lock_sock(newsk); | |
fa438ccf | 1498 | newsk->sk_backlog.head = newsk->sk_backlog.tail = NULL; |
8eae939f | 1499 | newsk->sk_backlog.len = 0; |
87d11ceb ACM |
1500 | |
1501 | atomic_set(&newsk->sk_rmem_alloc, 0); | |
2b85a34e ED |
1502 | /* |
1503 | * sk_wmem_alloc set to one (see sk_free() and sock_wfree()) | |
1504 | */ | |
1505 | atomic_set(&newsk->sk_wmem_alloc, 1); | |
87d11ceb ACM |
1506 | atomic_set(&newsk->sk_omem_alloc, 0); |
1507 | skb_queue_head_init(&newsk->sk_receive_queue); | |
1508 | skb_queue_head_init(&newsk->sk_write_queue); | |
1509 | ||
b6c6712a | 1510 | spin_lock_init(&newsk->sk_dst_lock); |
87d11ceb | 1511 | rwlock_init(&newsk->sk_callback_lock); |
443aef0e PZ |
1512 | lockdep_set_class_and_name(&newsk->sk_callback_lock, |
1513 | af_callback_keys + newsk->sk_family, | |
1514 | af_family_clock_key_strings[newsk->sk_family]); | |
87d11ceb ACM |
1515 | |
1516 | newsk->sk_dst_cache = NULL; | |
1517 | newsk->sk_wmem_queued = 0; | |
1518 | newsk->sk_forward_alloc = 0; | |
1519 | newsk->sk_send_head = NULL; | |
87d11ceb ACM |
1520 | newsk->sk_userlocks = sk->sk_userlocks & ~SOCK_BINDPORT_LOCK; |
1521 | ||
1522 | sock_reset_flag(newsk, SOCK_DONE); | |
1523 | skb_queue_head_init(&newsk->sk_error_queue); | |
1524 | ||
0d7da9dd | 1525 | filter = rcu_dereference_protected(newsk->sk_filter, 1); |
87d11ceb | 1526 | if (filter != NULL) |
278571ba AS |
1527 | /* though it's an empty new sock, the charging may fail |
1528 | * if sysctl_optmem_max was changed between creation of | |
1529 | * original socket and cloning | |
1530 | */ | |
1531 | is_charged = sk_filter_charge(newsk, filter); | |
87d11ceb | 1532 | |
278571ba | 1533 | if (unlikely(!is_charged || xfrm_sk_clone_policy(newsk))) { |
87d11ceb ACM |
1534 | /* It is still raw copy of parent, so invalidate |
1535 | * destructor and make plain sk_free() */ | |
1536 | newsk->sk_destruct = NULL; | |
b0691c8e | 1537 | bh_unlock_sock(newsk); |
87d11ceb ACM |
1538 | sk_free(newsk); |
1539 | newsk = NULL; | |
1540 | goto out; | |
1541 | } | |
1542 | ||
1543 | newsk->sk_err = 0; | |
1544 | newsk->sk_priority = 0; | |
2c8c56e1 | 1545 | newsk->sk_incoming_cpu = raw_smp_processor_id(); |
33cf7c90 | 1546 | atomic64_set(&newsk->sk_cookie, 0); |
4dc6dc71 ED |
1547 | /* |
1548 | * Before updating sk_refcnt, we must commit prior changes to memory | |
1549 | * (Documentation/RCU/rculist_nulls.txt for details) | |
1550 | */ | |
1551 | smp_wmb(); | |
87d11ceb ACM |
1552 | atomic_set(&newsk->sk_refcnt, 2); |
1553 | ||
1554 | /* | |
1555 | * Increment the counter in the same struct proto as the master | |
1556 | * sock (sk_refcnt_debug_inc uses newsk->sk_prot->socks, that | |
1557 | * is the same as sk->sk_prot->socks, as this field was copied | |
1558 | * with memcpy). | |
1559 | * | |
1560 | * This _changes_ the previous behaviour, where | |
1561 | * tcp_create_openreq_child always was incrementing the | |
1562 | * equivalent to tcp_prot->socks (inet_sock_nr), so this have | |
1563 | * to be taken into account in all callers. -acme | |
1564 | */ | |
1565 | sk_refcnt_debug_inc(newsk); | |
972692e0 | 1566 | sk_set_socket(newsk, NULL); |
43815482 | 1567 | newsk->sk_wq = NULL; |
87d11ceb | 1568 | |
f3f511e1 GC |
1569 | sk_update_clone(sk, newsk); |
1570 | ||
87d11ceb | 1571 | if (newsk->sk_prot->sockets_allocated) |
180d8cd9 | 1572 | sk_sockets_allocated_inc(newsk); |
704da560 | 1573 | |
08e29af3 | 1574 | if (newsk->sk_flags & SK_FLAGS_TIMESTAMP) |
704da560 | 1575 | net_enable_timestamp(); |
87d11ceb ACM |
1576 | } |
1577 | out: | |
1578 | return newsk; | |
1579 | } | |
e56c57d0 | 1580 | EXPORT_SYMBOL_GPL(sk_clone_lock); |
87d11ceb | 1581 | |
9958089a AK |
1582 | void sk_setup_caps(struct sock *sk, struct dst_entry *dst) |
1583 | { | |
1584 | __sk_dst_set(sk, dst); | |
1585 | sk->sk_route_caps = dst->dev->features; | |
1586 | if (sk->sk_route_caps & NETIF_F_GSO) | |
4fcd6b99 | 1587 | sk->sk_route_caps |= NETIF_F_GSO_SOFTWARE; |
a465419b | 1588 | sk->sk_route_caps &= ~sk->sk_route_nocaps; |
9958089a | 1589 | if (sk_can_gso(sk)) { |
82cc1a7a | 1590 | if (dst->header_len) { |
9958089a | 1591 | sk->sk_route_caps &= ~NETIF_F_GSO_MASK; |
82cc1a7a | 1592 | } else { |
9958089a | 1593 | sk->sk_route_caps |= NETIF_F_SG | NETIF_F_HW_CSUM; |
82cc1a7a | 1594 | sk->sk_gso_max_size = dst->dev->gso_max_size; |
1485348d | 1595 | sk->sk_gso_max_segs = dst->dev->gso_max_segs; |
82cc1a7a | 1596 | } |
9958089a AK |
1597 | } |
1598 | } | |
1599 | EXPORT_SYMBOL_GPL(sk_setup_caps); | |
1600 | ||
1da177e4 LT |
1601 | /* |
1602 | * Simple resource managers for sockets. | |
1603 | */ | |
1604 | ||
1605 | ||
4ec93edb YH |
1606 | /* |
1607 | * Write buffer destructor automatically called from kfree_skb. | |
1da177e4 LT |
1608 | */ |
1609 | void sock_wfree(struct sk_buff *skb) | |
1610 | { | |
1611 | struct sock *sk = skb->sk; | |
d99927f4 | 1612 | unsigned int len = skb->truesize; |
1da177e4 | 1613 | |
d99927f4 ED |
1614 | if (!sock_flag(sk, SOCK_USE_WRITE_QUEUE)) { |
1615 | /* | |
1616 | * Keep a reference on sk_wmem_alloc, this will be released | |
1617 | * after sk_write_space() call | |
1618 | */ | |
1619 | atomic_sub(len - 1, &sk->sk_wmem_alloc); | |
1da177e4 | 1620 | sk->sk_write_space(sk); |
d99927f4 ED |
1621 | len = 1; |
1622 | } | |
2b85a34e | 1623 | /* |
d99927f4 ED |
1624 | * if sk_wmem_alloc reaches 0, we must finish what sk_free() |
1625 | * could not do because of in-flight packets | |
2b85a34e | 1626 | */ |
d99927f4 | 1627 | if (atomic_sub_and_test(len, &sk->sk_wmem_alloc)) |
2b85a34e | 1628 | __sk_free(sk); |
1da177e4 | 1629 | } |
2a91525c | 1630 | EXPORT_SYMBOL(sock_wfree); |
1da177e4 | 1631 | |
f2f872f9 ED |
1632 | void skb_orphan_partial(struct sk_buff *skb) |
1633 | { | |
1634 | /* TCP stack sets skb->ooo_okay based on sk_wmem_alloc, | |
1635 | * so we do not completely orphan skb, but transfert all | |
1636 | * accounted bytes but one, to avoid unexpected reorders. | |
1637 | */ | |
1638 | if (skb->destructor == sock_wfree | |
1639 | #ifdef CONFIG_INET | |
1640 | || skb->destructor == tcp_wfree | |
1641 | #endif | |
1642 | ) { | |
1643 | atomic_sub(skb->truesize - 1, &skb->sk->sk_wmem_alloc); | |
1644 | skb->truesize = 1; | |
1645 | } else { | |
1646 | skb_orphan(skb); | |
1647 | } | |
1648 | } | |
1649 | EXPORT_SYMBOL(skb_orphan_partial); | |
1650 | ||
4ec93edb YH |
1651 | /* |
1652 | * Read buffer destructor automatically called from kfree_skb. | |
1da177e4 LT |
1653 | */ |
1654 | void sock_rfree(struct sk_buff *skb) | |
1655 | { | |
1656 | struct sock *sk = skb->sk; | |
d361fd59 | 1657 | unsigned int len = skb->truesize; |
1da177e4 | 1658 | |
d361fd59 ED |
1659 | atomic_sub(len, &sk->sk_rmem_alloc); |
1660 | sk_mem_uncharge(sk, len); | |
1da177e4 | 1661 | } |
2a91525c | 1662 | EXPORT_SYMBOL(sock_rfree); |
1da177e4 | 1663 | |
7768eed8 OH |
1664 | /* |
1665 | * Buffer destructor for skbs that are not used directly in read or write | |
1666 | * path, e.g. for error handler skbs. Automatically called from kfree_skb. | |
1667 | */ | |
62bccb8c AD |
1668 | void sock_efree(struct sk_buff *skb) |
1669 | { | |
1670 | sock_put(skb->sk); | |
1671 | } | |
1672 | EXPORT_SYMBOL(sock_efree); | |
1673 | ||
976d0201 | 1674 | kuid_t sock_i_uid(struct sock *sk) |
1da177e4 | 1675 | { |
976d0201 | 1676 | kuid_t uid; |
1da177e4 | 1677 | |
f064af1e | 1678 | read_lock_bh(&sk->sk_callback_lock); |
976d0201 | 1679 | uid = sk->sk_socket ? SOCK_INODE(sk->sk_socket)->i_uid : GLOBAL_ROOT_UID; |
f064af1e | 1680 | read_unlock_bh(&sk->sk_callback_lock); |
1da177e4 LT |
1681 | return uid; |
1682 | } | |
2a91525c | 1683 | EXPORT_SYMBOL(sock_i_uid); |
1da177e4 LT |
1684 | |
1685 | unsigned long sock_i_ino(struct sock *sk) | |
1686 | { | |
1687 | unsigned long ino; | |
1688 | ||
f064af1e | 1689 | read_lock_bh(&sk->sk_callback_lock); |
1da177e4 | 1690 | ino = sk->sk_socket ? SOCK_INODE(sk->sk_socket)->i_ino : 0; |
f064af1e | 1691 | read_unlock_bh(&sk->sk_callback_lock); |
1da177e4 LT |
1692 | return ino; |
1693 | } | |
2a91525c | 1694 | EXPORT_SYMBOL(sock_i_ino); |
1da177e4 LT |
1695 | |
1696 | /* | |
1697 | * Allocate a skb from the socket's send buffer. | |
1698 | */ | |
86a76caf | 1699 | struct sk_buff *sock_wmalloc(struct sock *sk, unsigned long size, int force, |
dd0fc66f | 1700 | gfp_t priority) |
1da177e4 LT |
1701 | { |
1702 | if (force || atomic_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf) { | |
2a91525c | 1703 | struct sk_buff *skb = alloc_skb(size, priority); |
1da177e4 LT |
1704 | if (skb) { |
1705 | skb_set_owner_w(skb, sk); | |
1706 | return skb; | |
1707 | } | |
1708 | } | |
1709 | return NULL; | |
1710 | } | |
2a91525c | 1711 | EXPORT_SYMBOL(sock_wmalloc); |
1da177e4 | 1712 | |
4ec93edb | 1713 | /* |
1da177e4 | 1714 | * Allocate a memory block from the socket's option memory buffer. |
4ec93edb | 1715 | */ |
dd0fc66f | 1716 | void *sock_kmalloc(struct sock *sk, int size, gfp_t priority) |
1da177e4 | 1717 | { |
95c96174 | 1718 | if ((unsigned int)size <= sysctl_optmem_max && |
1da177e4 LT |
1719 | atomic_read(&sk->sk_omem_alloc) + size < sysctl_optmem_max) { |
1720 | void *mem; | |
1721 | /* First do the add, to avoid the race if kmalloc | |
4ec93edb | 1722 | * might sleep. |
1da177e4 LT |
1723 | */ |
1724 | atomic_add(size, &sk->sk_omem_alloc); | |
1725 | mem = kmalloc(size, priority); | |
1726 | if (mem) | |
1727 | return mem; | |
1728 | atomic_sub(size, &sk->sk_omem_alloc); | |
1729 | } | |
1730 | return NULL; | |
1731 | } | |
2a91525c | 1732 | EXPORT_SYMBOL(sock_kmalloc); |
1da177e4 | 1733 | |
79e88659 DB |
1734 | /* Free an option memory block. Note, we actually want the inline |
1735 | * here as this allows gcc to detect the nullify and fold away the | |
1736 | * condition entirely. | |
1da177e4 | 1737 | */ |
79e88659 DB |
1738 | static inline void __sock_kfree_s(struct sock *sk, void *mem, int size, |
1739 | const bool nullify) | |
1da177e4 | 1740 | { |
e53da5fb DM |
1741 | if (WARN_ON_ONCE(!mem)) |
1742 | return; | |
79e88659 DB |
1743 | if (nullify) |
1744 | kzfree(mem); | |
1745 | else | |
1746 | kfree(mem); | |
1da177e4 LT |
1747 | atomic_sub(size, &sk->sk_omem_alloc); |
1748 | } | |
79e88659 DB |
1749 | |
1750 | void sock_kfree_s(struct sock *sk, void *mem, int size) | |
1751 | { | |
1752 | __sock_kfree_s(sk, mem, size, false); | |
1753 | } | |
2a91525c | 1754 | EXPORT_SYMBOL(sock_kfree_s); |
1da177e4 | 1755 | |
79e88659 DB |
1756 | void sock_kzfree_s(struct sock *sk, void *mem, int size) |
1757 | { | |
1758 | __sock_kfree_s(sk, mem, size, true); | |
1759 | } | |
1760 | EXPORT_SYMBOL(sock_kzfree_s); | |
1761 | ||
1da177e4 LT |
1762 | /* It is almost wait_for_tcp_memory minus release_sock/lock_sock. |
1763 | I think, these locks should be removed for datagram sockets. | |
1764 | */ | |
2a91525c | 1765 | static long sock_wait_for_wmem(struct sock *sk, long timeo) |
1da177e4 LT |
1766 | { |
1767 | DEFINE_WAIT(wait); | |
1768 | ||
1769 | clear_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags); | |
1770 | for (;;) { | |
1771 | if (!timeo) | |
1772 | break; | |
1773 | if (signal_pending(current)) | |
1774 | break; | |
1775 | set_bit(SOCK_NOSPACE, &sk->sk_socket->flags); | |
aa395145 | 1776 | prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE); |
1da177e4 LT |
1777 | if (atomic_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf) |
1778 | break; | |
1779 | if (sk->sk_shutdown & SEND_SHUTDOWN) | |
1780 | break; | |
1781 | if (sk->sk_err) | |
1782 | break; | |
1783 | timeo = schedule_timeout(timeo); | |
1784 | } | |
aa395145 | 1785 | finish_wait(sk_sleep(sk), &wait); |
1da177e4 LT |
1786 | return timeo; |
1787 | } | |
1788 | ||
1789 | ||
1790 | /* | |
1791 | * Generic send/receive buffer handlers | |
1792 | */ | |
1793 | ||
4cc7f68d HX |
1794 | struct sk_buff *sock_alloc_send_pskb(struct sock *sk, unsigned long header_len, |
1795 | unsigned long data_len, int noblock, | |
28d64271 | 1796 | int *errcode, int max_page_order) |
1da177e4 | 1797 | { |
2e4e4410 | 1798 | struct sk_buff *skb; |
1da177e4 LT |
1799 | long timeo; |
1800 | int err; | |
1801 | ||
1da177e4 | 1802 | timeo = sock_sndtimeo(sk, noblock); |
2e4e4410 | 1803 | for (;;) { |
1da177e4 LT |
1804 | err = sock_error(sk); |
1805 | if (err != 0) | |
1806 | goto failure; | |
1807 | ||
1808 | err = -EPIPE; | |
1809 | if (sk->sk_shutdown & SEND_SHUTDOWN) | |
1810 | goto failure; | |
1811 | ||
2e4e4410 ED |
1812 | if (sk_wmem_alloc_get(sk) < sk->sk_sndbuf) |
1813 | break; | |
28d64271 | 1814 | |
2e4e4410 ED |
1815 | set_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags); |
1816 | set_bit(SOCK_NOSPACE, &sk->sk_socket->flags); | |
1817 | err = -EAGAIN; | |
1818 | if (!timeo) | |
1da177e4 | 1819 | goto failure; |
2e4e4410 ED |
1820 | if (signal_pending(current)) |
1821 | goto interrupted; | |
1822 | timeo = sock_wait_for_wmem(sk, timeo); | |
1da177e4 | 1823 | } |
2e4e4410 ED |
1824 | skb = alloc_skb_with_frags(header_len, data_len, max_page_order, |
1825 | errcode, sk->sk_allocation); | |
1826 | if (skb) | |
1827 | skb_set_owner_w(skb, sk); | |
1da177e4 LT |
1828 | return skb; |
1829 | ||
1830 | interrupted: | |
1831 | err = sock_intr_errno(timeo); | |
1832 | failure: | |
1833 | *errcode = err; | |
1834 | return NULL; | |
1835 | } | |
4cc7f68d | 1836 | EXPORT_SYMBOL(sock_alloc_send_pskb); |
1da177e4 | 1837 | |
4ec93edb | 1838 | struct sk_buff *sock_alloc_send_skb(struct sock *sk, unsigned long size, |
1da177e4 LT |
1839 | int noblock, int *errcode) |
1840 | { | |
28d64271 | 1841 | return sock_alloc_send_pskb(sk, size, 0, noblock, errcode, 0); |
1da177e4 | 1842 | } |
2a91525c | 1843 | EXPORT_SYMBOL(sock_alloc_send_skb); |
1da177e4 | 1844 | |
5640f768 ED |
1845 | /* On 32bit arches, an skb frag is limited to 2^15 */ |
1846 | #define SKB_FRAG_PAGE_ORDER get_order(32768) | |
1847 | ||
400dfd3a ED |
1848 | /** |
1849 | * skb_page_frag_refill - check that a page_frag contains enough room | |
1850 | * @sz: minimum size of the fragment we want to get | |
1851 | * @pfrag: pointer to page_frag | |
82d5e2b8 | 1852 | * @gfp: priority for memory allocation |
400dfd3a ED |
1853 | * |
1854 | * Note: While this allocator tries to use high order pages, there is | |
1855 | * no guarantee that allocations succeed. Therefore, @sz MUST be | |
1856 | * less or equal than PAGE_SIZE. | |
1857 | */ | |
d9b2938a | 1858 | bool skb_page_frag_refill(unsigned int sz, struct page_frag *pfrag, gfp_t gfp) |
5640f768 | 1859 | { |
5640f768 ED |
1860 | if (pfrag->page) { |
1861 | if (atomic_read(&pfrag->page->_count) == 1) { | |
1862 | pfrag->offset = 0; | |
1863 | return true; | |
1864 | } | |
400dfd3a | 1865 | if (pfrag->offset + sz <= pfrag->size) |
5640f768 ED |
1866 | return true; |
1867 | put_page(pfrag->page); | |
1868 | } | |
1869 | ||
d9b2938a ED |
1870 | pfrag->offset = 0; |
1871 | if (SKB_FRAG_PAGE_ORDER) { | |
1872 | pfrag->page = alloc_pages(gfp | __GFP_COMP | | |
1873 | __GFP_NOWARN | __GFP_NORETRY, | |
1874 | SKB_FRAG_PAGE_ORDER); | |
5640f768 | 1875 | if (likely(pfrag->page)) { |
d9b2938a | 1876 | pfrag->size = PAGE_SIZE << SKB_FRAG_PAGE_ORDER; |
5640f768 ED |
1877 | return true; |
1878 | } | |
d9b2938a ED |
1879 | } |
1880 | pfrag->page = alloc_page(gfp); | |
1881 | if (likely(pfrag->page)) { | |
1882 | pfrag->size = PAGE_SIZE; | |
1883 | return true; | |
1884 | } | |
400dfd3a ED |
1885 | return false; |
1886 | } | |
1887 | EXPORT_SYMBOL(skb_page_frag_refill); | |
1888 | ||
1889 | bool sk_page_frag_refill(struct sock *sk, struct page_frag *pfrag) | |
1890 | { | |
1891 | if (likely(skb_page_frag_refill(32U, pfrag, sk->sk_allocation))) | |
1892 | return true; | |
1893 | ||
5640f768 ED |
1894 | sk_enter_memory_pressure(sk); |
1895 | sk_stream_moderate_sndbuf(sk); | |
1896 | return false; | |
1897 | } | |
1898 | EXPORT_SYMBOL(sk_page_frag_refill); | |
1899 | ||
1da177e4 | 1900 | static void __lock_sock(struct sock *sk) |
f39234d6 NK |
1901 | __releases(&sk->sk_lock.slock) |
1902 | __acquires(&sk->sk_lock.slock) | |
1da177e4 LT |
1903 | { |
1904 | DEFINE_WAIT(wait); | |
1905 | ||
e71a4783 | 1906 | for (;;) { |
1da177e4 LT |
1907 | prepare_to_wait_exclusive(&sk->sk_lock.wq, &wait, |
1908 | TASK_UNINTERRUPTIBLE); | |
1909 | spin_unlock_bh(&sk->sk_lock.slock); | |
1910 | schedule(); | |
1911 | spin_lock_bh(&sk->sk_lock.slock); | |
e71a4783 | 1912 | if (!sock_owned_by_user(sk)) |
1da177e4 LT |
1913 | break; |
1914 | } | |
1915 | finish_wait(&sk->sk_lock.wq, &wait); | |
1916 | } | |
1917 | ||
1918 | static void __release_sock(struct sock *sk) | |
f39234d6 NK |
1919 | __releases(&sk->sk_lock.slock) |
1920 | __acquires(&sk->sk_lock.slock) | |
1da177e4 LT |
1921 | { |
1922 | struct sk_buff *skb = sk->sk_backlog.head; | |
1923 | ||
1924 | do { | |
1925 | sk->sk_backlog.head = sk->sk_backlog.tail = NULL; | |
1926 | bh_unlock_sock(sk); | |
1927 | ||
1928 | do { | |
1929 | struct sk_buff *next = skb->next; | |
1930 | ||
e4cbb02a | 1931 | prefetch(next); |
7fee226a | 1932 | WARN_ON_ONCE(skb_dst_is_noref(skb)); |
1da177e4 | 1933 | skb->next = NULL; |
c57943a1 | 1934 | sk_backlog_rcv(sk, skb); |
1da177e4 LT |
1935 | |
1936 | /* | |
1937 | * We are in process context here with softirqs | |
1938 | * disabled, use cond_resched_softirq() to preempt. | |
1939 | * This is safe to do because we've taken the backlog | |
1940 | * queue private: | |
1941 | */ | |
1942 | cond_resched_softirq(); | |
1943 | ||
1944 | skb = next; | |
1945 | } while (skb != NULL); | |
1946 | ||
1947 | bh_lock_sock(sk); | |
e71a4783 | 1948 | } while ((skb = sk->sk_backlog.head) != NULL); |
8eae939f ZY |
1949 | |
1950 | /* | |
1951 | * Doing the zeroing here guarantee we can not loop forever | |
1952 | * while a wild producer attempts to flood us. | |
1953 | */ | |
1954 | sk->sk_backlog.len = 0; | |
1da177e4 LT |
1955 | } |
1956 | ||
1957 | /** | |
1958 | * sk_wait_data - wait for data to arrive at sk_receive_queue | |
4dc3b16b PP |
1959 | * @sk: sock to wait on |
1960 | * @timeo: for how long | |
1da177e4 LT |
1961 | * |
1962 | * Now socket state including sk->sk_err is changed only under lock, | |
1963 | * hence we may omit checks after joining wait queue. | |
1964 | * We check receive queue before schedule() only as optimization; | |
1965 | * it is very likely that release_sock() added new data. | |
1966 | */ | |
1967 | int sk_wait_data(struct sock *sk, long *timeo) | |
1968 | { | |
1969 | int rc; | |
1970 | DEFINE_WAIT(wait); | |
1971 | ||
aa395145 | 1972 | prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE); |
1da177e4 LT |
1973 | set_bit(SOCK_ASYNC_WAITDATA, &sk->sk_socket->flags); |
1974 | rc = sk_wait_event(sk, timeo, !skb_queue_empty(&sk->sk_receive_queue)); | |
1975 | clear_bit(SOCK_ASYNC_WAITDATA, &sk->sk_socket->flags); | |
aa395145 | 1976 | finish_wait(sk_sleep(sk), &wait); |
1da177e4 LT |
1977 | return rc; |
1978 | } | |
1da177e4 LT |
1979 | EXPORT_SYMBOL(sk_wait_data); |
1980 | ||
3ab224be HA |
1981 | /** |
1982 | * __sk_mem_schedule - increase sk_forward_alloc and memory_allocated | |
1983 | * @sk: socket | |
1984 | * @size: memory size to allocate | |
1985 | * @kind: allocation type | |
1986 | * | |
1987 | * If kind is SK_MEM_SEND, it means wmem allocation. Otherwise it means | |
1988 | * rmem allocation. This function assumes that protocols which have | |
1989 | * memory_pressure use sk_wmem_queued as write buffer accounting. | |
1990 | */ | |
1991 | int __sk_mem_schedule(struct sock *sk, int size, int kind) | |
1992 | { | |
1993 | struct proto *prot = sk->sk_prot; | |
1994 | int amt = sk_mem_pages(size); | |
8d987e5c | 1995 | long allocated; |
e1aab161 | 1996 | int parent_status = UNDER_LIMIT; |
3ab224be HA |
1997 | |
1998 | sk->sk_forward_alloc += amt * SK_MEM_QUANTUM; | |
180d8cd9 | 1999 | |
e1aab161 | 2000 | allocated = sk_memory_allocated_add(sk, amt, &parent_status); |
3ab224be HA |
2001 | |
2002 | /* Under limit. */ | |
e1aab161 GC |
2003 | if (parent_status == UNDER_LIMIT && |
2004 | allocated <= sk_prot_mem_limits(sk, 0)) { | |
180d8cd9 | 2005 | sk_leave_memory_pressure(sk); |
3ab224be HA |
2006 | return 1; |
2007 | } | |
2008 | ||
e1aab161 GC |
2009 | /* Under pressure. (we or our parents) */ |
2010 | if ((parent_status > SOFT_LIMIT) || | |
2011 | allocated > sk_prot_mem_limits(sk, 1)) | |
180d8cd9 | 2012 | sk_enter_memory_pressure(sk); |
3ab224be | 2013 | |
e1aab161 GC |
2014 | /* Over hard limit (we or our parents) */ |
2015 | if ((parent_status == OVER_LIMIT) || | |
2016 | (allocated > sk_prot_mem_limits(sk, 2))) | |
3ab224be HA |
2017 | goto suppress_allocation; |
2018 | ||
2019 | /* guarantee minimum buffer size under pressure */ | |
2020 | if (kind == SK_MEM_RECV) { | |
2021 | if (atomic_read(&sk->sk_rmem_alloc) < prot->sysctl_rmem[0]) | |
2022 | return 1; | |
180d8cd9 | 2023 | |
3ab224be HA |
2024 | } else { /* SK_MEM_SEND */ |
2025 | if (sk->sk_type == SOCK_STREAM) { | |
2026 | if (sk->sk_wmem_queued < prot->sysctl_wmem[0]) | |
2027 | return 1; | |
2028 | } else if (atomic_read(&sk->sk_wmem_alloc) < | |
2029 | prot->sysctl_wmem[0]) | |
2030 | return 1; | |
2031 | } | |
2032 | ||
180d8cd9 | 2033 | if (sk_has_memory_pressure(sk)) { |
1748376b ED |
2034 | int alloc; |
2035 | ||
180d8cd9 | 2036 | if (!sk_under_memory_pressure(sk)) |
1748376b | 2037 | return 1; |
180d8cd9 GC |
2038 | alloc = sk_sockets_allocated_read_positive(sk); |
2039 | if (sk_prot_mem_limits(sk, 2) > alloc * | |
3ab224be HA |
2040 | sk_mem_pages(sk->sk_wmem_queued + |
2041 | atomic_read(&sk->sk_rmem_alloc) + | |
2042 | sk->sk_forward_alloc)) | |
2043 | return 1; | |
2044 | } | |
2045 | ||
2046 | suppress_allocation: | |
2047 | ||
2048 | if (kind == SK_MEM_SEND && sk->sk_type == SOCK_STREAM) { | |
2049 | sk_stream_moderate_sndbuf(sk); | |
2050 | ||
2051 | /* Fail only if socket is _under_ its sndbuf. | |
2052 | * In this case we cannot block, so that we have to fail. | |
2053 | */ | |
2054 | if (sk->sk_wmem_queued + size >= sk->sk_sndbuf) | |
2055 | return 1; | |
2056 | } | |
2057 | ||
3847ce32 SM |
2058 | trace_sock_exceed_buf_limit(sk, prot, allocated); |
2059 | ||
3ab224be HA |
2060 | /* Alas. Undo changes. */ |
2061 | sk->sk_forward_alloc -= amt * SK_MEM_QUANTUM; | |
180d8cd9 | 2062 | |
0e90b31f | 2063 | sk_memory_allocated_sub(sk, amt); |
180d8cd9 | 2064 | |
3ab224be HA |
2065 | return 0; |
2066 | } | |
3ab224be HA |
2067 | EXPORT_SYMBOL(__sk_mem_schedule); |
2068 | ||
2069 | /** | |
2070 | * __sk_reclaim - reclaim memory_allocated | |
2071 | * @sk: socket | |
2072 | */ | |
2073 | void __sk_mem_reclaim(struct sock *sk) | |
2074 | { | |
180d8cd9 | 2075 | sk_memory_allocated_sub(sk, |
0e90b31f | 2076 | sk->sk_forward_alloc >> SK_MEM_QUANTUM_SHIFT); |
3ab224be HA |
2077 | sk->sk_forward_alloc &= SK_MEM_QUANTUM - 1; |
2078 | ||
180d8cd9 GC |
2079 | if (sk_under_memory_pressure(sk) && |
2080 | (sk_memory_allocated(sk) < sk_prot_mem_limits(sk, 0))) | |
2081 | sk_leave_memory_pressure(sk); | |
3ab224be | 2082 | } |
3ab224be HA |
2083 | EXPORT_SYMBOL(__sk_mem_reclaim); |
2084 | ||
2085 | ||
1da177e4 LT |
2086 | /* |
2087 | * Set of default routines for initialising struct proto_ops when | |
2088 | * the protocol does not support a particular function. In certain | |
2089 | * cases where it makes no sense for a protocol to have a "do nothing" | |
2090 | * function, some default processing is provided. | |
2091 | */ | |
2092 | ||
2093 | int sock_no_bind(struct socket *sock, struct sockaddr *saddr, int len) | |
2094 | { | |
2095 | return -EOPNOTSUPP; | |
2096 | } | |
2a91525c | 2097 | EXPORT_SYMBOL(sock_no_bind); |
1da177e4 | 2098 | |
4ec93edb | 2099 | int sock_no_connect(struct socket *sock, struct sockaddr *saddr, |
1da177e4 LT |
2100 | int len, int flags) |
2101 | { | |
2102 | return -EOPNOTSUPP; | |
2103 | } | |
2a91525c | 2104 | EXPORT_SYMBOL(sock_no_connect); |
1da177e4 LT |
2105 | |
2106 | int sock_no_socketpair(struct socket *sock1, struct socket *sock2) | |
2107 | { | |
2108 | return -EOPNOTSUPP; | |
2109 | } | |
2a91525c | 2110 | EXPORT_SYMBOL(sock_no_socketpair); |
1da177e4 LT |
2111 | |
2112 | int sock_no_accept(struct socket *sock, struct socket *newsock, int flags) | |
2113 | { | |
2114 | return -EOPNOTSUPP; | |
2115 | } | |
2a91525c | 2116 | EXPORT_SYMBOL(sock_no_accept); |
1da177e4 | 2117 | |
4ec93edb | 2118 | int sock_no_getname(struct socket *sock, struct sockaddr *saddr, |
1da177e4 LT |
2119 | int *len, int peer) |
2120 | { | |
2121 | return -EOPNOTSUPP; | |
2122 | } | |
2a91525c | 2123 | EXPORT_SYMBOL(sock_no_getname); |
1da177e4 | 2124 | |
2a91525c | 2125 | unsigned int sock_no_poll(struct file *file, struct socket *sock, poll_table *pt) |
1da177e4 LT |
2126 | { |
2127 | return 0; | |
2128 | } | |
2a91525c | 2129 | EXPORT_SYMBOL(sock_no_poll); |
1da177e4 LT |
2130 | |
2131 | int sock_no_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg) | |
2132 | { | |
2133 | return -EOPNOTSUPP; | |
2134 | } | |
2a91525c | 2135 | EXPORT_SYMBOL(sock_no_ioctl); |
1da177e4 LT |
2136 | |
2137 | int sock_no_listen(struct socket *sock, int backlog) | |
2138 | { | |
2139 | return -EOPNOTSUPP; | |
2140 | } | |
2a91525c | 2141 | EXPORT_SYMBOL(sock_no_listen); |
1da177e4 LT |
2142 | |
2143 | int sock_no_shutdown(struct socket *sock, int how) | |
2144 | { | |
2145 | return -EOPNOTSUPP; | |
2146 | } | |
2a91525c | 2147 | EXPORT_SYMBOL(sock_no_shutdown); |
1da177e4 LT |
2148 | |
2149 | int sock_no_setsockopt(struct socket *sock, int level, int optname, | |
b7058842 | 2150 | char __user *optval, unsigned int optlen) |
1da177e4 LT |
2151 | { |
2152 | return -EOPNOTSUPP; | |
2153 | } | |
2a91525c | 2154 | EXPORT_SYMBOL(sock_no_setsockopt); |
1da177e4 LT |
2155 | |
2156 | int sock_no_getsockopt(struct socket *sock, int level, int optname, | |
2157 | char __user *optval, int __user *optlen) | |
2158 | { | |
2159 | return -EOPNOTSUPP; | |
2160 | } | |
2a91525c | 2161 | EXPORT_SYMBOL(sock_no_getsockopt); |
1da177e4 | 2162 | |
1b784140 | 2163 | int sock_no_sendmsg(struct socket *sock, struct msghdr *m, size_t len) |
1da177e4 LT |
2164 | { |
2165 | return -EOPNOTSUPP; | |
2166 | } | |
2a91525c | 2167 | EXPORT_SYMBOL(sock_no_sendmsg); |
1da177e4 | 2168 | |
1b784140 YX |
2169 | int sock_no_recvmsg(struct socket *sock, struct msghdr *m, size_t len, |
2170 | int flags) | |
1da177e4 LT |
2171 | { |
2172 | return -EOPNOTSUPP; | |
2173 | } | |
2a91525c | 2174 | EXPORT_SYMBOL(sock_no_recvmsg); |
1da177e4 LT |
2175 | |
2176 | int sock_no_mmap(struct file *file, struct socket *sock, struct vm_area_struct *vma) | |
2177 | { | |
2178 | /* Mirror missing mmap method error code */ | |
2179 | return -ENODEV; | |
2180 | } | |
2a91525c | 2181 | EXPORT_SYMBOL(sock_no_mmap); |
1da177e4 LT |
2182 | |
2183 | ssize_t sock_no_sendpage(struct socket *sock, struct page *page, int offset, size_t size, int flags) | |
2184 | { | |
2185 | ssize_t res; | |
2186 | struct msghdr msg = {.msg_flags = flags}; | |
2187 | struct kvec iov; | |
2188 | char *kaddr = kmap(page); | |
2189 | iov.iov_base = kaddr + offset; | |
2190 | iov.iov_len = size; | |
2191 | res = kernel_sendmsg(sock, &msg, &iov, 1, size); | |
2192 | kunmap(page); | |
2193 | return res; | |
2194 | } | |
2a91525c | 2195 | EXPORT_SYMBOL(sock_no_sendpage); |
1da177e4 LT |
2196 | |
2197 | /* | |
2198 | * Default Socket Callbacks | |
2199 | */ | |
2200 | ||
2201 | static void sock_def_wakeup(struct sock *sk) | |
2202 | { | |
43815482 ED |
2203 | struct socket_wq *wq; |
2204 | ||
2205 | rcu_read_lock(); | |
2206 | wq = rcu_dereference(sk->sk_wq); | |
2207 | if (wq_has_sleeper(wq)) | |
2208 | wake_up_interruptible_all(&wq->wait); | |
2209 | rcu_read_unlock(); | |
1da177e4 LT |
2210 | } |
2211 | ||
2212 | static void sock_def_error_report(struct sock *sk) | |
2213 | { | |
43815482 ED |
2214 | struct socket_wq *wq; |
2215 | ||
2216 | rcu_read_lock(); | |
2217 | wq = rcu_dereference(sk->sk_wq); | |
2218 | if (wq_has_sleeper(wq)) | |
2219 | wake_up_interruptible_poll(&wq->wait, POLLERR); | |
8d8ad9d7 | 2220 | sk_wake_async(sk, SOCK_WAKE_IO, POLL_ERR); |
43815482 | 2221 | rcu_read_unlock(); |
1da177e4 LT |
2222 | } |
2223 | ||
676d2369 | 2224 | static void sock_def_readable(struct sock *sk) |
1da177e4 | 2225 | { |
43815482 ED |
2226 | struct socket_wq *wq; |
2227 | ||
2228 | rcu_read_lock(); | |
2229 | wq = rcu_dereference(sk->sk_wq); | |
2230 | if (wq_has_sleeper(wq)) | |
2c6607c6 | 2231 | wake_up_interruptible_sync_poll(&wq->wait, POLLIN | POLLPRI | |
37e5540b | 2232 | POLLRDNORM | POLLRDBAND); |
8d8ad9d7 | 2233 | sk_wake_async(sk, SOCK_WAKE_WAITD, POLL_IN); |
43815482 | 2234 | rcu_read_unlock(); |
1da177e4 LT |
2235 | } |
2236 | ||
2237 | static void sock_def_write_space(struct sock *sk) | |
2238 | { | |
43815482 ED |
2239 | struct socket_wq *wq; |
2240 | ||
2241 | rcu_read_lock(); | |
1da177e4 LT |
2242 | |
2243 | /* Do not wake up a writer until he can make "significant" | |
2244 | * progress. --DaveM | |
2245 | */ | |
e71a4783 | 2246 | if ((atomic_read(&sk->sk_wmem_alloc) << 1) <= sk->sk_sndbuf) { |
43815482 ED |
2247 | wq = rcu_dereference(sk->sk_wq); |
2248 | if (wq_has_sleeper(wq)) | |
2249 | wake_up_interruptible_sync_poll(&wq->wait, POLLOUT | | |
37e5540b | 2250 | POLLWRNORM | POLLWRBAND); |
1da177e4 LT |
2251 | |
2252 | /* Should agree with poll, otherwise some programs break */ | |
2253 | if (sock_writeable(sk)) | |
8d8ad9d7 | 2254 | sk_wake_async(sk, SOCK_WAKE_SPACE, POLL_OUT); |
1da177e4 LT |
2255 | } |
2256 | ||
43815482 | 2257 | rcu_read_unlock(); |
1da177e4 LT |
2258 | } |
2259 | ||
2260 | static void sock_def_destruct(struct sock *sk) | |
2261 | { | |
a51482bd | 2262 | kfree(sk->sk_protinfo); |
1da177e4 LT |
2263 | } |
2264 | ||
2265 | void sk_send_sigurg(struct sock *sk) | |
2266 | { | |
2267 | if (sk->sk_socket && sk->sk_socket->file) | |
2268 | if (send_sigurg(&sk->sk_socket->file->f_owner)) | |
8d8ad9d7 | 2269 | sk_wake_async(sk, SOCK_WAKE_URG, POLL_PRI); |
1da177e4 | 2270 | } |
2a91525c | 2271 | EXPORT_SYMBOL(sk_send_sigurg); |
1da177e4 LT |
2272 | |
2273 | void sk_reset_timer(struct sock *sk, struct timer_list* timer, | |
2274 | unsigned long expires) | |
2275 | { | |
2276 | if (!mod_timer(timer, expires)) | |
2277 | sock_hold(sk); | |
2278 | } | |
1da177e4 LT |
2279 | EXPORT_SYMBOL(sk_reset_timer); |
2280 | ||
2281 | void sk_stop_timer(struct sock *sk, struct timer_list* timer) | |
2282 | { | |
25cc4ae9 | 2283 | if (del_timer(timer)) |
1da177e4 LT |
2284 | __sock_put(sk); |
2285 | } | |
1da177e4 LT |
2286 | EXPORT_SYMBOL(sk_stop_timer); |
2287 | ||
2288 | void sock_init_data(struct socket *sock, struct sock *sk) | |
2289 | { | |
2290 | skb_queue_head_init(&sk->sk_receive_queue); | |
2291 | skb_queue_head_init(&sk->sk_write_queue); | |
2292 | skb_queue_head_init(&sk->sk_error_queue); | |
2293 | ||
2294 | sk->sk_send_head = NULL; | |
2295 | ||
2296 | init_timer(&sk->sk_timer); | |
4ec93edb | 2297 | |
1da177e4 LT |
2298 | sk->sk_allocation = GFP_KERNEL; |
2299 | sk->sk_rcvbuf = sysctl_rmem_default; | |
2300 | sk->sk_sndbuf = sysctl_wmem_default; | |
2301 | sk->sk_state = TCP_CLOSE; | |
972692e0 | 2302 | sk_set_socket(sk, sock); |
1da177e4 LT |
2303 | |
2304 | sock_set_flag(sk, SOCK_ZAPPED); | |
2305 | ||
e71a4783 | 2306 | if (sock) { |
1da177e4 | 2307 | sk->sk_type = sock->type; |
43815482 | 2308 | sk->sk_wq = sock->wq; |
1da177e4 LT |
2309 | sock->sk = sk; |
2310 | } else | |
43815482 | 2311 | sk->sk_wq = NULL; |
1da177e4 | 2312 | |
b6c6712a | 2313 | spin_lock_init(&sk->sk_dst_lock); |
1da177e4 | 2314 | rwlock_init(&sk->sk_callback_lock); |
443aef0e PZ |
2315 | lockdep_set_class_and_name(&sk->sk_callback_lock, |
2316 | af_callback_keys + sk->sk_family, | |
2317 | af_family_clock_key_strings[sk->sk_family]); | |
1da177e4 LT |
2318 | |
2319 | sk->sk_state_change = sock_def_wakeup; | |
2320 | sk->sk_data_ready = sock_def_readable; | |
2321 | sk->sk_write_space = sock_def_write_space; | |
2322 | sk->sk_error_report = sock_def_error_report; | |
2323 | sk->sk_destruct = sock_def_destruct; | |
2324 | ||
5640f768 ED |
2325 | sk->sk_frag.page = NULL; |
2326 | sk->sk_frag.offset = 0; | |
ef64a54f | 2327 | sk->sk_peek_off = -1; |
1da177e4 | 2328 | |
109f6e39 EB |
2329 | sk->sk_peer_pid = NULL; |
2330 | sk->sk_peer_cred = NULL; | |
1da177e4 LT |
2331 | sk->sk_write_pending = 0; |
2332 | sk->sk_rcvlowat = 1; | |
2333 | sk->sk_rcvtimeo = MAX_SCHEDULE_TIMEOUT; | |
2334 | sk->sk_sndtimeo = MAX_SCHEDULE_TIMEOUT; | |
2335 | ||
f37f0afb | 2336 | sk->sk_stamp = ktime_set(-1L, 0); |
1da177e4 | 2337 | |
e0d1095a | 2338 | #ifdef CONFIG_NET_RX_BUSY_POLL |
06021292 | 2339 | sk->sk_napi_id = 0; |
64b0dc51 | 2340 | sk->sk_ll_usec = sysctl_net_busy_read; |
06021292 ET |
2341 | #endif |
2342 | ||
62748f32 | 2343 | sk->sk_max_pacing_rate = ~0U; |
7eec4174 | 2344 | sk->sk_pacing_rate = ~0U; |
4dc6dc71 ED |
2345 | /* |
2346 | * Before updating sk_refcnt, we must commit prior changes to memory | |
2347 | * (Documentation/RCU/rculist_nulls.txt for details) | |
2348 | */ | |
2349 | smp_wmb(); | |
1da177e4 | 2350 | atomic_set(&sk->sk_refcnt, 1); |
33c732c3 | 2351 | atomic_set(&sk->sk_drops, 0); |
1da177e4 | 2352 | } |
2a91525c | 2353 | EXPORT_SYMBOL(sock_init_data); |
1da177e4 | 2354 | |
b5606c2d | 2355 | void lock_sock_nested(struct sock *sk, int subclass) |
1da177e4 LT |
2356 | { |
2357 | might_sleep(); | |
a5b5bb9a | 2358 | spin_lock_bh(&sk->sk_lock.slock); |
d2e9117c | 2359 | if (sk->sk_lock.owned) |
1da177e4 | 2360 | __lock_sock(sk); |
d2e9117c | 2361 | sk->sk_lock.owned = 1; |
a5b5bb9a IM |
2362 | spin_unlock(&sk->sk_lock.slock); |
2363 | /* | |
2364 | * The sk_lock has mutex_lock() semantics here: | |
2365 | */ | |
fcc70d5f | 2366 | mutex_acquire(&sk->sk_lock.dep_map, subclass, 0, _RET_IP_); |
a5b5bb9a | 2367 | local_bh_enable(); |
1da177e4 | 2368 | } |
fcc70d5f | 2369 | EXPORT_SYMBOL(lock_sock_nested); |
1da177e4 | 2370 | |
b5606c2d | 2371 | void release_sock(struct sock *sk) |
1da177e4 | 2372 | { |
a5b5bb9a IM |
2373 | /* |
2374 | * The sk_lock has mutex_unlock() semantics: | |
2375 | */ | |
2376 | mutex_release(&sk->sk_lock.dep_map, 1, _RET_IP_); | |
2377 | ||
2378 | spin_lock_bh(&sk->sk_lock.slock); | |
1da177e4 LT |
2379 | if (sk->sk_backlog.tail) |
2380 | __release_sock(sk); | |
46d3ceab | 2381 | |
c3f9b018 ED |
2382 | /* Warning : release_cb() might need to release sk ownership, |
2383 | * ie call sock_release_ownership(sk) before us. | |
2384 | */ | |
46d3ceab ED |
2385 | if (sk->sk_prot->release_cb) |
2386 | sk->sk_prot->release_cb(sk); | |
2387 | ||
c3f9b018 | 2388 | sock_release_ownership(sk); |
a5b5bb9a IM |
2389 | if (waitqueue_active(&sk->sk_lock.wq)) |
2390 | wake_up(&sk->sk_lock.wq); | |
2391 | spin_unlock_bh(&sk->sk_lock.slock); | |
1da177e4 LT |
2392 | } |
2393 | EXPORT_SYMBOL(release_sock); | |
2394 | ||
8a74ad60 ED |
2395 | /** |
2396 | * lock_sock_fast - fast version of lock_sock | |
2397 | * @sk: socket | |
2398 | * | |
2399 | * This version should be used for very small section, where process wont block | |
2400 | * return false if fast path is taken | |
2401 | * sk_lock.slock locked, owned = 0, BH disabled | |
2402 | * return true if slow path is taken | |
2403 | * sk_lock.slock unlocked, owned = 1, BH enabled | |
2404 | */ | |
2405 | bool lock_sock_fast(struct sock *sk) | |
2406 | { | |
2407 | might_sleep(); | |
2408 | spin_lock_bh(&sk->sk_lock.slock); | |
2409 | ||
2410 | if (!sk->sk_lock.owned) | |
2411 | /* | |
2412 | * Note : We must disable BH | |
2413 | */ | |
2414 | return false; | |
2415 | ||
2416 | __lock_sock(sk); | |
2417 | sk->sk_lock.owned = 1; | |
2418 | spin_unlock(&sk->sk_lock.slock); | |
2419 | /* | |
2420 | * The sk_lock has mutex_lock() semantics here: | |
2421 | */ | |
2422 | mutex_acquire(&sk->sk_lock.dep_map, 0, 0, _RET_IP_); | |
2423 | local_bh_enable(); | |
2424 | return true; | |
2425 | } | |
2426 | EXPORT_SYMBOL(lock_sock_fast); | |
2427 | ||
1da177e4 | 2428 | int sock_get_timestamp(struct sock *sk, struct timeval __user *userstamp) |
4ec93edb | 2429 | { |
b7aa0bf7 | 2430 | struct timeval tv; |
1da177e4 | 2431 | if (!sock_flag(sk, SOCK_TIMESTAMP)) |
20d49473 | 2432 | sock_enable_timestamp(sk, SOCK_TIMESTAMP); |
b7aa0bf7 ED |
2433 | tv = ktime_to_timeval(sk->sk_stamp); |
2434 | if (tv.tv_sec == -1) | |
1da177e4 | 2435 | return -ENOENT; |
b7aa0bf7 ED |
2436 | if (tv.tv_sec == 0) { |
2437 | sk->sk_stamp = ktime_get_real(); | |
2438 | tv = ktime_to_timeval(sk->sk_stamp); | |
2439 | } | |
2440 | return copy_to_user(userstamp, &tv, sizeof(tv)) ? -EFAULT : 0; | |
4ec93edb | 2441 | } |
1da177e4 LT |
2442 | EXPORT_SYMBOL(sock_get_timestamp); |
2443 | ||
ae40eb1e ED |
2444 | int sock_get_timestampns(struct sock *sk, struct timespec __user *userstamp) |
2445 | { | |
2446 | struct timespec ts; | |
2447 | if (!sock_flag(sk, SOCK_TIMESTAMP)) | |
20d49473 | 2448 | sock_enable_timestamp(sk, SOCK_TIMESTAMP); |
ae40eb1e ED |
2449 | ts = ktime_to_timespec(sk->sk_stamp); |
2450 | if (ts.tv_sec == -1) | |
2451 | return -ENOENT; | |
2452 | if (ts.tv_sec == 0) { | |
2453 | sk->sk_stamp = ktime_get_real(); | |
2454 | ts = ktime_to_timespec(sk->sk_stamp); | |
2455 | } | |
2456 | return copy_to_user(userstamp, &ts, sizeof(ts)) ? -EFAULT : 0; | |
2457 | } | |
2458 | EXPORT_SYMBOL(sock_get_timestampns); | |
2459 | ||
20d49473 | 2460 | void sock_enable_timestamp(struct sock *sk, int flag) |
4ec93edb | 2461 | { |
20d49473 | 2462 | if (!sock_flag(sk, flag)) { |
08e29af3 ED |
2463 | unsigned long previous_flags = sk->sk_flags; |
2464 | ||
20d49473 PO |
2465 | sock_set_flag(sk, flag); |
2466 | /* | |
2467 | * we just set one of the two flags which require net | |
2468 | * time stamping, but time stamping might have been on | |
2469 | * already because of the other one | |
2470 | */ | |
08e29af3 | 2471 | if (!(previous_flags & SK_FLAGS_TIMESTAMP)) |
20d49473 | 2472 | net_enable_timestamp(); |
1da177e4 LT |
2473 | } |
2474 | } | |
1da177e4 | 2475 | |
cb820f8e RC |
2476 | int sock_recv_errqueue(struct sock *sk, struct msghdr *msg, int len, |
2477 | int level, int type) | |
2478 | { | |
2479 | struct sock_exterr_skb *serr; | |
364a9e93 | 2480 | struct sk_buff *skb; |
cb820f8e RC |
2481 | int copied, err; |
2482 | ||
2483 | err = -EAGAIN; | |
364a9e93 | 2484 | skb = sock_dequeue_err_skb(sk); |
cb820f8e RC |
2485 | if (skb == NULL) |
2486 | goto out; | |
2487 | ||
2488 | copied = skb->len; | |
2489 | if (copied > len) { | |
2490 | msg->msg_flags |= MSG_TRUNC; | |
2491 | copied = len; | |
2492 | } | |
51f3d02b | 2493 | err = skb_copy_datagram_msg(skb, 0, msg, copied); |
cb820f8e RC |
2494 | if (err) |
2495 | goto out_free_skb; | |
2496 | ||
2497 | sock_recv_timestamp(msg, sk, skb); | |
2498 | ||
2499 | serr = SKB_EXT_ERR(skb); | |
2500 | put_cmsg(msg, level, type, sizeof(serr->ee), &serr->ee); | |
2501 | ||
2502 | msg->msg_flags |= MSG_ERRQUEUE; | |
2503 | err = copied; | |
2504 | ||
cb820f8e RC |
2505 | out_free_skb: |
2506 | kfree_skb(skb); | |
2507 | out: | |
2508 | return err; | |
2509 | } | |
2510 | EXPORT_SYMBOL(sock_recv_errqueue); | |
2511 | ||
1da177e4 LT |
2512 | /* |
2513 | * Get a socket option on an socket. | |
2514 | * | |
2515 | * FIX: POSIX 1003.1g is very ambiguous here. It states that | |
2516 | * asynchronous errors should be reported by getsockopt. We assume | |
2517 | * this means if you specify SO_ERROR (otherwise whats the point of it). | |
2518 | */ | |
2519 | int sock_common_getsockopt(struct socket *sock, int level, int optname, | |
2520 | char __user *optval, int __user *optlen) | |
2521 | { | |
2522 | struct sock *sk = sock->sk; | |
2523 | ||
2524 | return sk->sk_prot->getsockopt(sk, level, optname, optval, optlen); | |
2525 | } | |
1da177e4 LT |
2526 | EXPORT_SYMBOL(sock_common_getsockopt); |
2527 | ||
3fdadf7d | 2528 | #ifdef CONFIG_COMPAT |
543d9cfe ACM |
2529 | int compat_sock_common_getsockopt(struct socket *sock, int level, int optname, |
2530 | char __user *optval, int __user *optlen) | |
3fdadf7d DM |
2531 | { |
2532 | struct sock *sk = sock->sk; | |
2533 | ||
1e51f951 | 2534 | if (sk->sk_prot->compat_getsockopt != NULL) |
543d9cfe ACM |
2535 | return sk->sk_prot->compat_getsockopt(sk, level, optname, |
2536 | optval, optlen); | |
3fdadf7d DM |
2537 | return sk->sk_prot->getsockopt(sk, level, optname, optval, optlen); |
2538 | } | |
2539 | EXPORT_SYMBOL(compat_sock_common_getsockopt); | |
2540 | #endif | |
2541 | ||
1b784140 YX |
2542 | int sock_common_recvmsg(struct socket *sock, struct msghdr *msg, size_t size, |
2543 | int flags) | |
1da177e4 LT |
2544 | { |
2545 | struct sock *sk = sock->sk; | |
2546 | int addr_len = 0; | |
2547 | int err; | |
2548 | ||
1b784140 | 2549 | err = sk->sk_prot->recvmsg(sk, msg, size, flags & MSG_DONTWAIT, |
1da177e4 LT |
2550 | flags & ~MSG_DONTWAIT, &addr_len); |
2551 | if (err >= 0) | |
2552 | msg->msg_namelen = addr_len; | |
2553 | return err; | |
2554 | } | |
1da177e4 LT |
2555 | EXPORT_SYMBOL(sock_common_recvmsg); |
2556 | ||
2557 | /* | |
2558 | * Set socket options on an inet socket. | |
2559 | */ | |
2560 | int sock_common_setsockopt(struct socket *sock, int level, int optname, | |
b7058842 | 2561 | char __user *optval, unsigned int optlen) |
1da177e4 LT |
2562 | { |
2563 | struct sock *sk = sock->sk; | |
2564 | ||
2565 | return sk->sk_prot->setsockopt(sk, level, optname, optval, optlen); | |
2566 | } | |
1da177e4 LT |
2567 | EXPORT_SYMBOL(sock_common_setsockopt); |
2568 | ||
3fdadf7d | 2569 | #ifdef CONFIG_COMPAT |
543d9cfe | 2570 | int compat_sock_common_setsockopt(struct socket *sock, int level, int optname, |
b7058842 | 2571 | char __user *optval, unsigned int optlen) |
3fdadf7d DM |
2572 | { |
2573 | struct sock *sk = sock->sk; | |
2574 | ||
543d9cfe ACM |
2575 | if (sk->sk_prot->compat_setsockopt != NULL) |
2576 | return sk->sk_prot->compat_setsockopt(sk, level, optname, | |
2577 | optval, optlen); | |
3fdadf7d DM |
2578 | return sk->sk_prot->setsockopt(sk, level, optname, optval, optlen); |
2579 | } | |
2580 | EXPORT_SYMBOL(compat_sock_common_setsockopt); | |
2581 | #endif | |
2582 | ||
1da177e4 LT |
2583 | void sk_common_release(struct sock *sk) |
2584 | { | |
2585 | if (sk->sk_prot->destroy) | |
2586 | sk->sk_prot->destroy(sk); | |
2587 | ||
2588 | /* | |
2589 | * Observation: when sock_common_release is called, processes have | |
2590 | * no access to socket. But net still has. | |
2591 | * Step one, detach it from networking: | |
2592 | * | |
2593 | * A. Remove from hash tables. | |
2594 | */ | |
2595 | ||
2596 | sk->sk_prot->unhash(sk); | |
2597 | ||
2598 | /* | |
2599 | * In this point socket cannot receive new packets, but it is possible | |
2600 | * that some packets are in flight because some CPU runs receiver and | |
2601 | * did hash table lookup before we unhashed socket. They will achieve | |
2602 | * receive queue and will be purged by socket destructor. | |
2603 | * | |
2604 | * Also we still have packets pending on receive queue and probably, | |
2605 | * our own packets waiting in device queues. sock_destroy will drain | |
2606 | * receive queue, but transmitted packets will delay socket destruction | |
2607 | * until the last reference will be released. | |
2608 | */ | |
2609 | ||
2610 | sock_orphan(sk); | |
2611 | ||
2612 | xfrm_sk_free_policy(sk); | |
2613 | ||
e6848976 | 2614 | sk_refcnt_debug_release(sk); |
5640f768 ED |
2615 | |
2616 | if (sk->sk_frag.page) { | |
2617 | put_page(sk->sk_frag.page); | |
2618 | sk->sk_frag.page = NULL; | |
2619 | } | |
2620 | ||
1da177e4 LT |
2621 | sock_put(sk); |
2622 | } | |
1da177e4 LT |
2623 | EXPORT_SYMBOL(sk_common_release); |
2624 | ||
13ff3d6f PE |
2625 | #ifdef CONFIG_PROC_FS |
2626 | #define PROTO_INUSE_NR 64 /* should be enough for the first time */ | |
1338d466 PE |
2627 | struct prot_inuse { |
2628 | int val[PROTO_INUSE_NR]; | |
2629 | }; | |
13ff3d6f PE |
2630 | |
2631 | static DECLARE_BITMAP(proto_inuse_idx, PROTO_INUSE_NR); | |
70ee1159 PE |
2632 | |
2633 | #ifdef CONFIG_NET_NS | |
2634 | void sock_prot_inuse_add(struct net *net, struct proto *prot, int val) | |
2635 | { | |
d6d9ca0f | 2636 | __this_cpu_add(net->core.inuse->val[prot->inuse_idx], val); |
70ee1159 PE |
2637 | } |
2638 | EXPORT_SYMBOL_GPL(sock_prot_inuse_add); | |
2639 | ||
2640 | int sock_prot_inuse_get(struct net *net, struct proto *prot) | |
2641 | { | |
2642 | int cpu, idx = prot->inuse_idx; | |
2643 | int res = 0; | |
2644 | ||
2645 | for_each_possible_cpu(cpu) | |
2646 | res += per_cpu_ptr(net->core.inuse, cpu)->val[idx]; | |
2647 | ||
2648 | return res >= 0 ? res : 0; | |
2649 | } | |
2650 | EXPORT_SYMBOL_GPL(sock_prot_inuse_get); | |
2651 | ||
2c8c1e72 | 2652 | static int __net_init sock_inuse_init_net(struct net *net) |
70ee1159 PE |
2653 | { |
2654 | net->core.inuse = alloc_percpu(struct prot_inuse); | |
2655 | return net->core.inuse ? 0 : -ENOMEM; | |
2656 | } | |
2657 | ||
2c8c1e72 | 2658 | static void __net_exit sock_inuse_exit_net(struct net *net) |
70ee1159 PE |
2659 | { |
2660 | free_percpu(net->core.inuse); | |
2661 | } | |
2662 | ||
2663 | static struct pernet_operations net_inuse_ops = { | |
2664 | .init = sock_inuse_init_net, | |
2665 | .exit = sock_inuse_exit_net, | |
2666 | }; | |
2667 | ||
2668 | static __init int net_inuse_init(void) | |
2669 | { | |
2670 | if (register_pernet_subsys(&net_inuse_ops)) | |
2671 | panic("Cannot initialize net inuse counters"); | |
2672 | ||
2673 | return 0; | |
2674 | } | |
2675 | ||
2676 | core_initcall(net_inuse_init); | |
2677 | #else | |
1338d466 PE |
2678 | static DEFINE_PER_CPU(struct prot_inuse, prot_inuse); |
2679 | ||
c29a0bc4 | 2680 | void sock_prot_inuse_add(struct net *net, struct proto *prot, int val) |
1338d466 | 2681 | { |
d6d9ca0f | 2682 | __this_cpu_add(prot_inuse.val[prot->inuse_idx], val); |
1338d466 PE |
2683 | } |
2684 | EXPORT_SYMBOL_GPL(sock_prot_inuse_add); | |
2685 | ||
c29a0bc4 | 2686 | int sock_prot_inuse_get(struct net *net, struct proto *prot) |
1338d466 PE |
2687 | { |
2688 | int cpu, idx = prot->inuse_idx; | |
2689 | int res = 0; | |
2690 | ||
2691 | for_each_possible_cpu(cpu) | |
2692 | res += per_cpu(prot_inuse, cpu).val[idx]; | |
2693 | ||
2694 | return res >= 0 ? res : 0; | |
2695 | } | |
2696 | EXPORT_SYMBOL_GPL(sock_prot_inuse_get); | |
70ee1159 | 2697 | #endif |
13ff3d6f PE |
2698 | |
2699 | static void assign_proto_idx(struct proto *prot) | |
2700 | { | |
2701 | prot->inuse_idx = find_first_zero_bit(proto_inuse_idx, PROTO_INUSE_NR); | |
2702 | ||
2703 | if (unlikely(prot->inuse_idx == PROTO_INUSE_NR - 1)) { | |
e005d193 | 2704 | pr_err("PROTO_INUSE_NR exhausted\n"); |
13ff3d6f PE |
2705 | return; |
2706 | } | |
2707 | ||
2708 | set_bit(prot->inuse_idx, proto_inuse_idx); | |
2709 | } | |
2710 | ||
2711 | static void release_proto_idx(struct proto *prot) | |
2712 | { | |
2713 | if (prot->inuse_idx != PROTO_INUSE_NR - 1) | |
2714 | clear_bit(prot->inuse_idx, proto_inuse_idx); | |
2715 | } | |
2716 | #else | |
2717 | static inline void assign_proto_idx(struct proto *prot) | |
2718 | { | |
2719 | } | |
2720 | ||
2721 | static inline void release_proto_idx(struct proto *prot) | |
2722 | { | |
2723 | } | |
2724 | #endif | |
2725 | ||
0159dfd3 ED |
2726 | static void req_prot_cleanup(struct request_sock_ops *rsk_prot) |
2727 | { | |
2728 | if (!rsk_prot) | |
2729 | return; | |
2730 | kfree(rsk_prot->slab_name); | |
2731 | rsk_prot->slab_name = NULL; | |
2732 | if (rsk_prot->slab) { | |
2733 | kmem_cache_destroy(rsk_prot->slab); | |
2734 | rsk_prot->slab = NULL; | |
2735 | } | |
2736 | } | |
2737 | ||
2738 | static int req_prot_init(const struct proto *prot) | |
2739 | { | |
2740 | struct request_sock_ops *rsk_prot = prot->rsk_prot; | |
2741 | ||
2742 | if (!rsk_prot) | |
2743 | return 0; | |
2744 | ||
2745 | rsk_prot->slab_name = kasprintf(GFP_KERNEL, "request_sock_%s", | |
2746 | prot->name); | |
2747 | if (!rsk_prot->slab_name) | |
2748 | return -ENOMEM; | |
2749 | ||
2750 | rsk_prot->slab = kmem_cache_create(rsk_prot->slab_name, | |
2751 | rsk_prot->obj_size, 0, | |
fa76ce73 | 2752 | 0, NULL); |
0159dfd3 ED |
2753 | |
2754 | if (!rsk_prot->slab) { | |
2755 | pr_crit("%s: Can't create request sock SLAB cache!\n", | |
2756 | prot->name); | |
2757 | return -ENOMEM; | |
2758 | } | |
2759 | return 0; | |
2760 | } | |
2761 | ||
b733c007 PE |
2762 | int proto_register(struct proto *prot, int alloc_slab) |
2763 | { | |
1da177e4 LT |
2764 | if (alloc_slab) { |
2765 | prot->slab = kmem_cache_create(prot->name, prot->obj_size, 0, | |
271b72c7 ED |
2766 | SLAB_HWCACHE_ALIGN | prot->slab_flags, |
2767 | NULL); | |
1da177e4 LT |
2768 | |
2769 | if (prot->slab == NULL) { | |
e005d193 JP |
2770 | pr_crit("%s: Can't create sock SLAB cache!\n", |
2771 | prot->name); | |
60e7663d | 2772 | goto out; |
1da177e4 | 2773 | } |
2e6599cb | 2774 | |
0159dfd3 ED |
2775 | if (req_prot_init(prot)) |
2776 | goto out_free_request_sock_slab; | |
8feaf0c0 | 2777 | |
6d6ee43e | 2778 | if (prot->twsk_prot != NULL) { |
faf23422 | 2779 | prot->twsk_prot->twsk_slab_name = kasprintf(GFP_KERNEL, "tw_sock_%s", prot->name); |
8feaf0c0 | 2780 | |
7e56b5d6 | 2781 | if (prot->twsk_prot->twsk_slab_name == NULL) |
8feaf0c0 ACM |
2782 | goto out_free_request_sock_slab; |
2783 | ||
6d6ee43e | 2784 | prot->twsk_prot->twsk_slab = |
7e56b5d6 | 2785 | kmem_cache_create(prot->twsk_prot->twsk_slab_name, |
6d6ee43e | 2786 | prot->twsk_prot->twsk_obj_size, |
3ab5aee7 | 2787 | 0, |
52db70dc | 2788 | prot->slab_flags, |
20c2df83 | 2789 | NULL); |
6d6ee43e | 2790 | if (prot->twsk_prot->twsk_slab == NULL) |
8feaf0c0 ACM |
2791 | goto out_free_timewait_sock_slab_name; |
2792 | } | |
1da177e4 LT |
2793 | } |
2794 | ||
36b77a52 | 2795 | mutex_lock(&proto_list_mutex); |
1da177e4 | 2796 | list_add(&prot->node, &proto_list); |
13ff3d6f | 2797 | assign_proto_idx(prot); |
36b77a52 | 2798 | mutex_unlock(&proto_list_mutex); |
b733c007 PE |
2799 | return 0; |
2800 | ||
8feaf0c0 | 2801 | out_free_timewait_sock_slab_name: |
7e56b5d6 | 2802 | kfree(prot->twsk_prot->twsk_slab_name); |
8feaf0c0 | 2803 | out_free_request_sock_slab: |
0159dfd3 ED |
2804 | req_prot_cleanup(prot->rsk_prot); |
2805 | ||
2e6599cb ACM |
2806 | kmem_cache_destroy(prot->slab); |
2807 | prot->slab = NULL; | |
b733c007 PE |
2808 | out: |
2809 | return -ENOBUFS; | |
1da177e4 | 2810 | } |
1da177e4 LT |
2811 | EXPORT_SYMBOL(proto_register); |
2812 | ||
2813 | void proto_unregister(struct proto *prot) | |
2814 | { | |
36b77a52 | 2815 | mutex_lock(&proto_list_mutex); |
13ff3d6f | 2816 | release_proto_idx(prot); |
0a3f4358 | 2817 | list_del(&prot->node); |
36b77a52 | 2818 | mutex_unlock(&proto_list_mutex); |
1da177e4 LT |
2819 | |
2820 | if (prot->slab != NULL) { | |
2821 | kmem_cache_destroy(prot->slab); | |
2822 | prot->slab = NULL; | |
2823 | } | |
2824 | ||
0159dfd3 | 2825 | req_prot_cleanup(prot->rsk_prot); |
2e6599cb | 2826 | |
6d6ee43e | 2827 | if (prot->twsk_prot != NULL && prot->twsk_prot->twsk_slab != NULL) { |
6d6ee43e | 2828 | kmem_cache_destroy(prot->twsk_prot->twsk_slab); |
7e56b5d6 | 2829 | kfree(prot->twsk_prot->twsk_slab_name); |
6d6ee43e | 2830 | prot->twsk_prot->twsk_slab = NULL; |
8feaf0c0 | 2831 | } |
1da177e4 | 2832 | } |
1da177e4 LT |
2833 | EXPORT_SYMBOL(proto_unregister); |
2834 | ||
2835 | #ifdef CONFIG_PROC_FS | |
1da177e4 | 2836 | static void *proto_seq_start(struct seq_file *seq, loff_t *pos) |
36b77a52 | 2837 | __acquires(proto_list_mutex) |
1da177e4 | 2838 | { |
36b77a52 | 2839 | mutex_lock(&proto_list_mutex); |
60f0438a | 2840 | return seq_list_start_head(&proto_list, *pos); |
1da177e4 LT |
2841 | } |
2842 | ||
2843 | static void *proto_seq_next(struct seq_file *seq, void *v, loff_t *pos) | |
2844 | { | |
60f0438a | 2845 | return seq_list_next(v, &proto_list, pos); |
1da177e4 LT |
2846 | } |
2847 | ||
2848 | static void proto_seq_stop(struct seq_file *seq, void *v) | |
36b77a52 | 2849 | __releases(proto_list_mutex) |
1da177e4 | 2850 | { |
36b77a52 | 2851 | mutex_unlock(&proto_list_mutex); |
1da177e4 LT |
2852 | } |
2853 | ||
2854 | static char proto_method_implemented(const void *method) | |
2855 | { | |
2856 | return method == NULL ? 'n' : 'y'; | |
2857 | } | |
180d8cd9 GC |
2858 | static long sock_prot_memory_allocated(struct proto *proto) |
2859 | { | |
cb75a36c | 2860 | return proto->memory_allocated != NULL ? proto_memory_allocated(proto) : -1L; |
180d8cd9 GC |
2861 | } |
2862 | ||
2863 | static char *sock_prot_memory_pressure(struct proto *proto) | |
2864 | { | |
2865 | return proto->memory_pressure != NULL ? | |
2866 | proto_memory_pressure(proto) ? "yes" : "no" : "NI"; | |
2867 | } | |
1da177e4 LT |
2868 | |
2869 | static void proto_seq_printf(struct seq_file *seq, struct proto *proto) | |
2870 | { | |
180d8cd9 | 2871 | |
8d987e5c | 2872 | seq_printf(seq, "%-9s %4u %6d %6ld %-3s %6u %-3s %-10s " |
1da177e4 LT |
2873 | "%2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c\n", |
2874 | proto->name, | |
2875 | proto->obj_size, | |
14e943db | 2876 | sock_prot_inuse_get(seq_file_net(seq), proto), |
180d8cd9 GC |
2877 | sock_prot_memory_allocated(proto), |
2878 | sock_prot_memory_pressure(proto), | |
1da177e4 LT |
2879 | proto->max_header, |
2880 | proto->slab == NULL ? "no" : "yes", | |
2881 | module_name(proto->owner), | |
2882 | proto_method_implemented(proto->close), | |
2883 | proto_method_implemented(proto->connect), | |
2884 | proto_method_implemented(proto->disconnect), | |
2885 | proto_method_implemented(proto->accept), | |
2886 | proto_method_implemented(proto->ioctl), | |
2887 | proto_method_implemented(proto->init), | |
2888 | proto_method_implemented(proto->destroy), | |
2889 | proto_method_implemented(proto->shutdown), | |
2890 | proto_method_implemented(proto->setsockopt), | |
2891 | proto_method_implemented(proto->getsockopt), | |
2892 | proto_method_implemented(proto->sendmsg), | |
2893 | proto_method_implemented(proto->recvmsg), | |
2894 | proto_method_implemented(proto->sendpage), | |
2895 | proto_method_implemented(proto->bind), | |
2896 | proto_method_implemented(proto->backlog_rcv), | |
2897 | proto_method_implemented(proto->hash), | |
2898 | proto_method_implemented(proto->unhash), | |
2899 | proto_method_implemented(proto->get_port), | |
2900 | proto_method_implemented(proto->enter_memory_pressure)); | |
2901 | } | |
2902 | ||
2903 | static int proto_seq_show(struct seq_file *seq, void *v) | |
2904 | { | |
60f0438a | 2905 | if (v == &proto_list) |
1da177e4 LT |
2906 | seq_printf(seq, "%-9s %-4s %-8s %-6s %-5s %-7s %-4s %-10s %s", |
2907 | "protocol", | |
2908 | "size", | |
2909 | "sockets", | |
2910 | "memory", | |
2911 | "press", | |
2912 | "maxhdr", | |
2913 | "slab", | |
2914 | "module", | |
2915 | "cl co di ac io in de sh ss gs se re sp bi br ha uh gp em\n"); | |
2916 | else | |
60f0438a | 2917 | proto_seq_printf(seq, list_entry(v, struct proto, node)); |
1da177e4 LT |
2918 | return 0; |
2919 | } | |
2920 | ||
f690808e | 2921 | static const struct seq_operations proto_seq_ops = { |
1da177e4 LT |
2922 | .start = proto_seq_start, |
2923 | .next = proto_seq_next, | |
2924 | .stop = proto_seq_stop, | |
2925 | .show = proto_seq_show, | |
2926 | }; | |
2927 | ||
2928 | static int proto_seq_open(struct inode *inode, struct file *file) | |
2929 | { | |
14e943db ED |
2930 | return seq_open_net(inode, file, &proto_seq_ops, |
2931 | sizeof(struct seq_net_private)); | |
1da177e4 LT |
2932 | } |
2933 | ||
9a32144e | 2934 | static const struct file_operations proto_seq_fops = { |
1da177e4 LT |
2935 | .owner = THIS_MODULE, |
2936 | .open = proto_seq_open, | |
2937 | .read = seq_read, | |
2938 | .llseek = seq_lseek, | |
14e943db ED |
2939 | .release = seq_release_net, |
2940 | }; | |
2941 | ||
2942 | static __net_init int proto_init_net(struct net *net) | |
2943 | { | |
d4beaa66 | 2944 | if (!proc_create("protocols", S_IRUGO, net->proc_net, &proto_seq_fops)) |
14e943db ED |
2945 | return -ENOMEM; |
2946 | ||
2947 | return 0; | |
2948 | } | |
2949 | ||
2950 | static __net_exit void proto_exit_net(struct net *net) | |
2951 | { | |
ece31ffd | 2952 | remove_proc_entry("protocols", net->proc_net); |
14e943db ED |
2953 | } |
2954 | ||
2955 | ||
2956 | static __net_initdata struct pernet_operations proto_net_ops = { | |
2957 | .init = proto_init_net, | |
2958 | .exit = proto_exit_net, | |
1da177e4 LT |
2959 | }; |
2960 | ||
2961 | static int __init proto_init(void) | |
2962 | { | |
14e943db | 2963 | return register_pernet_subsys(&proto_net_ops); |
1da177e4 LT |
2964 | } |
2965 | ||
2966 | subsys_initcall(proto_init); | |
2967 | ||
2968 | #endif /* PROC_FS */ |