Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * INET An implementation of the TCP/IP protocol suite for the LINUX | |
3 | * operating system. INET is implemented using the BSD Socket | |
4 | * interface as the means of communication with the user level. | |
5 | * | |
6 | * Generic socket support routines. Memory allocators, socket lock/release | |
7 | * handler for protocols to use and generic option handler. | |
8 | * | |
9 | * | |
02c30a84 | 10 | * Authors: Ross Biro |
1da177e4 LT |
11 | * Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG> |
12 | * Florian La Roche, <flla@stud.uni-sb.de> | |
13 | * Alan Cox, <A.Cox@swansea.ac.uk> | |
14 | * | |
15 | * Fixes: | |
16 | * Alan Cox : Numerous verify_area() problems | |
17 | * Alan Cox : Connecting on a connecting socket | |
18 | * now returns an error for tcp. | |
19 | * Alan Cox : sock->protocol is set correctly. | |
20 | * and is not sometimes left as 0. | |
21 | * Alan Cox : connect handles icmp errors on a | |
22 | * connect properly. Unfortunately there | |
23 | * is a restart syscall nasty there. I | |
24 | * can't match BSD without hacking the C | |
25 | * library. Ideas urgently sought! | |
26 | * Alan Cox : Disallow bind() to addresses that are | |
27 | * not ours - especially broadcast ones!! | |
28 | * Alan Cox : Socket 1024 _IS_ ok for users. (fencepost) | |
29 | * Alan Cox : sock_wfree/sock_rfree don't destroy sockets, | |
30 | * instead they leave that for the DESTROY timer. | |
31 | * Alan Cox : Clean up error flag in accept | |
32 | * Alan Cox : TCP ack handling is buggy, the DESTROY timer | |
33 | * was buggy. Put a remove_sock() in the handler | |
34 | * for memory when we hit 0. Also altered the timer | |
4ec93edb | 35 | * code. The ACK stuff can wait and needs major |
1da177e4 LT |
36 | * TCP layer surgery. |
37 | * Alan Cox : Fixed TCP ack bug, removed remove sock | |
38 | * and fixed timer/inet_bh race. | |
39 | * Alan Cox : Added zapped flag for TCP | |
40 | * Alan Cox : Move kfree_skb into skbuff.c and tidied up surplus code | |
41 | * Alan Cox : for new sk_buff allocations wmalloc/rmalloc now call alloc_skb | |
42 | * Alan Cox : kfree_s calls now are kfree_skbmem so we can track skb resources | |
43 | * Alan Cox : Supports socket option broadcast now as does udp. Packet and raw need fixing. | |
44 | * Alan Cox : Added RCVBUF,SNDBUF size setting. It suddenly occurred to me how easy it was so... | |
45 | * Rick Sladkey : Relaxed UDP rules for matching packets. | |
46 | * C.E.Hawkins : IFF_PROMISC/SIOCGHWADDR support | |
47 | * Pauline Middelink : identd support | |
48 | * Alan Cox : Fixed connect() taking signals I think. | |
49 | * Alan Cox : SO_LINGER supported | |
50 | * Alan Cox : Error reporting fixes | |
51 | * Anonymous : inet_create tidied up (sk->reuse setting) | |
52 | * Alan Cox : inet sockets don't set sk->type! | |
53 | * Alan Cox : Split socket option code | |
54 | * Alan Cox : Callbacks | |
55 | * Alan Cox : Nagle flag for Charles & Johannes stuff | |
56 | * Alex : Removed restriction on inet fioctl | |
57 | * Alan Cox : Splitting INET from NET core | |
58 | * Alan Cox : Fixed bogus SO_TYPE handling in getsockopt() | |
59 | * Adam Caldwell : Missing return in SO_DONTROUTE/SO_DEBUG code | |
60 | * Alan Cox : Split IP from generic code | |
61 | * Alan Cox : New kfree_skbmem() | |
62 | * Alan Cox : Make SO_DEBUG superuser only. | |
63 | * Alan Cox : Allow anyone to clear SO_DEBUG | |
64 | * (compatibility fix) | |
65 | * Alan Cox : Added optimistic memory grabbing for AF_UNIX throughput. | |
66 | * Alan Cox : Allocator for a socket is settable. | |
67 | * Alan Cox : SO_ERROR includes soft errors. | |
68 | * Alan Cox : Allow NULL arguments on some SO_ opts | |
69 | * Alan Cox : Generic socket allocation to make hooks | |
70 | * easier (suggested by Craig Metz). | |
71 | * Michael Pall : SO_ERROR returns positive errno again | |
72 | * Steve Whitehouse: Added default destructor to free | |
73 | * protocol private data. | |
74 | * Steve Whitehouse: Added various other default routines | |
75 | * common to several socket families. | |
76 | * Chris Evans : Call suser() check last on F_SETOWN | |
77 | * Jay Schulist : Added SO_ATTACH_FILTER and SO_DETACH_FILTER. | |
78 | * Andi Kleen : Add sock_kmalloc()/sock_kfree_s() | |
79 | * Andi Kleen : Fix write_space callback | |
80 | * Chris Evans : Security fixes - signedness again | |
81 | * Arnaldo C. Melo : cleanups, use skb_queue_purge | |
82 | * | |
83 | * To Fix: | |
84 | * | |
85 | * | |
86 | * This program is free software; you can redistribute it and/or | |
87 | * modify it under the terms of the GNU General Public License | |
88 | * as published by the Free Software Foundation; either version | |
89 | * 2 of the License, or (at your option) any later version. | |
90 | */ | |
91 | ||
e005d193 JP |
92 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
93 | ||
4fc268d2 | 94 | #include <linux/capability.h> |
1da177e4 | 95 | #include <linux/errno.h> |
cb820f8e | 96 | #include <linux/errqueue.h> |
1da177e4 LT |
97 | #include <linux/types.h> |
98 | #include <linux/socket.h> | |
99 | #include <linux/in.h> | |
100 | #include <linux/kernel.h> | |
1da177e4 LT |
101 | #include <linux/module.h> |
102 | #include <linux/proc_fs.h> | |
103 | #include <linux/seq_file.h> | |
104 | #include <linux/sched.h> | |
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> |
eb4cb008 | 134 | #include <linux/sock_diag.h> |
1da177e4 LT |
135 | |
136 | #include <linux/filter.h> | |
538950a1 | 137 | #include <net/sock_reuseport.h> |
1da177e4 | 138 | |
3847ce32 SM |
139 | #include <trace/events/sock.h> |
140 | ||
1da177e4 LT |
141 | #ifdef CONFIG_INET |
142 | #include <net/tcp.h> | |
143 | #endif | |
144 | ||
076bb0c8 | 145 | #include <net/busy_poll.h> |
06021292 | 146 | |
36b77a52 | 147 | static DEFINE_MUTEX(proto_list_mutex); |
d1a4c0b3 GC |
148 | static LIST_HEAD(proto_list); |
149 | ||
a3b299da EB |
150 | /** |
151 | * sk_ns_capable - General socket capability test | |
152 | * @sk: Socket to use a capability on or through | |
153 | * @user_ns: The user namespace of the capability to use | |
154 | * @cap: The capability to use | |
155 | * | |
156 | * Test to see if the opener of the socket had when the socket was | |
157 | * created and the current process has the capability @cap in the user | |
158 | * namespace @user_ns. | |
159 | */ | |
160 | bool sk_ns_capable(const struct sock *sk, | |
161 | struct user_namespace *user_ns, int cap) | |
162 | { | |
163 | return file_ns_capable(sk->sk_socket->file, user_ns, cap) && | |
164 | ns_capable(user_ns, cap); | |
165 | } | |
166 | EXPORT_SYMBOL(sk_ns_capable); | |
167 | ||
168 | /** | |
169 | * sk_capable - Socket global capability test | |
170 | * @sk: Socket to use a capability on or through | |
e793c0f7 | 171 | * @cap: The global capability to use |
a3b299da EB |
172 | * |
173 | * Test to see if the opener of the socket had when the socket was | |
174 | * created and the current process has the capability @cap in all user | |
175 | * namespaces. | |
176 | */ | |
177 | bool sk_capable(const struct sock *sk, int cap) | |
178 | { | |
179 | return sk_ns_capable(sk, &init_user_ns, cap); | |
180 | } | |
181 | EXPORT_SYMBOL(sk_capable); | |
182 | ||
183 | /** | |
184 | * sk_net_capable - Network namespace socket capability test | |
185 | * @sk: Socket to use a capability on or through | |
186 | * @cap: The capability to use | |
187 | * | |
e793c0f7 | 188 | * Test to see if the opener of the socket had when the socket was created |
a3b299da EB |
189 | * and the current process has the capability @cap over the network namespace |
190 | * the socket is a member of. | |
191 | */ | |
192 | bool sk_net_capable(const struct sock *sk, int cap) | |
193 | { | |
194 | return sk_ns_capable(sk, sock_net(sk)->user_ns, cap); | |
195 | } | |
196 | EXPORT_SYMBOL(sk_net_capable); | |
197 | ||
da21f24d IM |
198 | /* |
199 | * Each address family might have different locking rules, so we have | |
200 | * one slock key per address family: | |
201 | */ | |
a5b5bb9a IM |
202 | static struct lock_class_key af_family_keys[AF_MAX]; |
203 | static struct lock_class_key af_family_slock_keys[AF_MAX]; | |
204 | ||
a5b5bb9a IM |
205 | /* |
206 | * Make lock validator output more readable. (we pre-construct these | |
207 | * strings build-time, so that runtime initialization of socket | |
208 | * locks is fast): | |
209 | */ | |
36cbd3dc | 210 | static const char *const af_family_key_strings[AF_MAX+1] = { |
a5b5bb9a IM |
211 | "sk_lock-AF_UNSPEC", "sk_lock-AF_UNIX" , "sk_lock-AF_INET" , |
212 | "sk_lock-AF_AX25" , "sk_lock-AF_IPX" , "sk_lock-AF_APPLETALK", | |
213 | "sk_lock-AF_NETROM", "sk_lock-AF_BRIDGE" , "sk_lock-AF_ATMPVC" , | |
214 | "sk_lock-AF_X25" , "sk_lock-AF_INET6" , "sk_lock-AF_ROSE" , | |
215 | "sk_lock-AF_DECnet", "sk_lock-AF_NETBEUI" , "sk_lock-AF_SECURITY" , | |
216 | "sk_lock-AF_KEY" , "sk_lock-AF_NETLINK" , "sk_lock-AF_PACKET" , | |
217 | "sk_lock-AF_ASH" , "sk_lock-AF_ECONET" , "sk_lock-AF_ATMSVC" , | |
cbd151bf | 218 | "sk_lock-AF_RDS" , "sk_lock-AF_SNA" , "sk_lock-AF_IRDA" , |
a5b5bb9a | 219 | "sk_lock-AF_PPPOX" , "sk_lock-AF_WANPIPE" , "sk_lock-AF_LLC" , |
cd05acfe | 220 | "sk_lock-27" , "sk_lock-28" , "sk_lock-AF_CAN" , |
17926a79 | 221 | "sk_lock-AF_TIPC" , "sk_lock-AF_BLUETOOTH", "sk_lock-IUCV" , |
bce7b154 | 222 | "sk_lock-AF_RXRPC" , "sk_lock-AF_ISDN" , "sk_lock-AF_PHONET" , |
6f107b58 | 223 | "sk_lock-AF_IEEE802154", "sk_lock-AF_CAIF" , "sk_lock-AF_ALG" , |
0a1a37b6 DC |
224 | "sk_lock-AF_NFC" , "sk_lock-AF_VSOCK" , "sk_lock-AF_KCM" , |
225 | "sk_lock-AF_MAX" | |
a5b5bb9a | 226 | }; |
36cbd3dc | 227 | static const char *const af_family_slock_key_strings[AF_MAX+1] = { |
a5b5bb9a IM |
228 | "slock-AF_UNSPEC", "slock-AF_UNIX" , "slock-AF_INET" , |
229 | "slock-AF_AX25" , "slock-AF_IPX" , "slock-AF_APPLETALK", | |
230 | "slock-AF_NETROM", "slock-AF_BRIDGE" , "slock-AF_ATMPVC" , | |
231 | "slock-AF_X25" , "slock-AF_INET6" , "slock-AF_ROSE" , | |
232 | "slock-AF_DECnet", "slock-AF_NETBEUI" , "slock-AF_SECURITY" , | |
233 | "slock-AF_KEY" , "slock-AF_NETLINK" , "slock-AF_PACKET" , | |
234 | "slock-AF_ASH" , "slock-AF_ECONET" , "slock-AF_ATMSVC" , | |
cbd151bf | 235 | "slock-AF_RDS" , "slock-AF_SNA" , "slock-AF_IRDA" , |
a5b5bb9a | 236 | "slock-AF_PPPOX" , "slock-AF_WANPIPE" , "slock-AF_LLC" , |
cd05acfe | 237 | "slock-27" , "slock-28" , "slock-AF_CAN" , |
17926a79 | 238 | "slock-AF_TIPC" , "slock-AF_BLUETOOTH", "slock-AF_IUCV" , |
bce7b154 | 239 | "slock-AF_RXRPC" , "slock-AF_ISDN" , "slock-AF_PHONET" , |
6f107b58 | 240 | "slock-AF_IEEE802154", "slock-AF_CAIF" , "slock-AF_ALG" , |
0a1a37b6 DC |
241 | "slock-AF_NFC" , "slock-AF_VSOCK" ,"slock-AF_KCM" , |
242 | "slock-AF_MAX" | |
a5b5bb9a | 243 | }; |
36cbd3dc | 244 | static const char *const af_family_clock_key_strings[AF_MAX+1] = { |
443aef0e PZ |
245 | "clock-AF_UNSPEC", "clock-AF_UNIX" , "clock-AF_INET" , |
246 | "clock-AF_AX25" , "clock-AF_IPX" , "clock-AF_APPLETALK", | |
247 | "clock-AF_NETROM", "clock-AF_BRIDGE" , "clock-AF_ATMPVC" , | |
248 | "clock-AF_X25" , "clock-AF_INET6" , "clock-AF_ROSE" , | |
249 | "clock-AF_DECnet", "clock-AF_NETBEUI" , "clock-AF_SECURITY" , | |
250 | "clock-AF_KEY" , "clock-AF_NETLINK" , "clock-AF_PACKET" , | |
251 | "clock-AF_ASH" , "clock-AF_ECONET" , "clock-AF_ATMSVC" , | |
cbd151bf | 252 | "clock-AF_RDS" , "clock-AF_SNA" , "clock-AF_IRDA" , |
443aef0e | 253 | "clock-AF_PPPOX" , "clock-AF_WANPIPE" , "clock-AF_LLC" , |
b4942af6 | 254 | "clock-27" , "clock-28" , "clock-AF_CAN" , |
e51f802b | 255 | "clock-AF_TIPC" , "clock-AF_BLUETOOTH", "clock-AF_IUCV" , |
bce7b154 | 256 | "clock-AF_RXRPC" , "clock-AF_ISDN" , "clock-AF_PHONET" , |
6f107b58 | 257 | "clock-AF_IEEE802154", "clock-AF_CAIF" , "clock-AF_ALG" , |
0a1a37b6 DC |
258 | "clock-AF_NFC" , "clock-AF_VSOCK" , "clock-AF_KCM" , |
259 | "clock-AF_MAX" | |
443aef0e | 260 | }; |
da21f24d IM |
261 | |
262 | /* | |
263 | * sk_callback_lock locking rules are per-address-family, | |
264 | * so split the lock classes by using a per-AF key: | |
265 | */ | |
266 | static struct lock_class_key af_callback_keys[AF_MAX]; | |
267 | ||
1da177e4 LT |
268 | /* Take into consideration the size of the struct sk_buff overhead in the |
269 | * determination of these values, since that is non-constant across | |
270 | * platforms. This makes socket queueing behavior and performance | |
271 | * not depend upon such differences. | |
272 | */ | |
273 | #define _SK_MEM_PACKETS 256 | |
87fb4b7b | 274 | #define _SK_MEM_OVERHEAD SKB_TRUESIZE(256) |
1da177e4 LT |
275 | #define SK_WMEM_MAX (_SK_MEM_OVERHEAD * _SK_MEM_PACKETS) |
276 | #define SK_RMEM_MAX (_SK_MEM_OVERHEAD * _SK_MEM_PACKETS) | |
277 | ||
278 | /* Run time adjustable parameters. */ | |
ab32ea5d | 279 | __u32 sysctl_wmem_max __read_mostly = SK_WMEM_MAX; |
6d8ebc8a | 280 | EXPORT_SYMBOL(sysctl_wmem_max); |
ab32ea5d | 281 | __u32 sysctl_rmem_max __read_mostly = SK_RMEM_MAX; |
6d8ebc8a | 282 | EXPORT_SYMBOL(sysctl_rmem_max); |
ab32ea5d BH |
283 | __u32 sysctl_wmem_default __read_mostly = SK_WMEM_MAX; |
284 | __u32 sysctl_rmem_default __read_mostly = SK_RMEM_MAX; | |
1da177e4 | 285 | |
25985edc | 286 | /* Maximal space eaten by iovec or ancillary data plus some space */ |
ab32ea5d | 287 | int sysctl_optmem_max __read_mostly = sizeof(unsigned long)*(2*UIO_MAXIOV+512); |
2a91525c | 288 | EXPORT_SYMBOL(sysctl_optmem_max); |
1da177e4 | 289 | |
b245be1f WB |
290 | int sysctl_tstamp_allow_data __read_mostly = 1; |
291 | ||
c93bdd0e MG |
292 | struct static_key memalloc_socks = STATIC_KEY_INIT_FALSE; |
293 | EXPORT_SYMBOL_GPL(memalloc_socks); | |
294 | ||
7cb02404 MG |
295 | /** |
296 | * sk_set_memalloc - sets %SOCK_MEMALLOC | |
297 | * @sk: socket to set it on | |
298 | * | |
299 | * Set %SOCK_MEMALLOC on a socket for access to emergency reserves. | |
300 | * It's the responsibility of the admin to adjust min_free_kbytes | |
301 | * to meet the requirements | |
302 | */ | |
303 | void sk_set_memalloc(struct sock *sk) | |
304 | { | |
305 | sock_set_flag(sk, SOCK_MEMALLOC); | |
306 | sk->sk_allocation |= __GFP_MEMALLOC; | |
c93bdd0e | 307 | static_key_slow_inc(&memalloc_socks); |
7cb02404 MG |
308 | } |
309 | EXPORT_SYMBOL_GPL(sk_set_memalloc); | |
310 | ||
311 | void sk_clear_memalloc(struct sock *sk) | |
312 | { | |
313 | sock_reset_flag(sk, SOCK_MEMALLOC); | |
314 | sk->sk_allocation &= ~__GFP_MEMALLOC; | |
c93bdd0e | 315 | static_key_slow_dec(&memalloc_socks); |
c76562b6 MG |
316 | |
317 | /* | |
318 | * SOCK_MEMALLOC is allowed to ignore rmem limits to ensure forward | |
5d753610 MG |
319 | * progress of swapping. SOCK_MEMALLOC may be cleared while |
320 | * it has rmem allocations due to the last swapfile being deactivated | |
321 | * but there is a risk that the socket is unusable due to exceeding | |
322 | * the rmem limits. Reclaim the reserves and obey rmem limits again. | |
c76562b6 | 323 | */ |
5d753610 | 324 | sk_mem_reclaim(sk); |
7cb02404 MG |
325 | } |
326 | EXPORT_SYMBOL_GPL(sk_clear_memalloc); | |
327 | ||
b4b9e355 MG |
328 | int __sk_backlog_rcv(struct sock *sk, struct sk_buff *skb) |
329 | { | |
330 | int ret; | |
331 | unsigned long pflags = current->flags; | |
332 | ||
333 | /* these should have been dropped before queueing */ | |
334 | BUG_ON(!sock_flag(sk, SOCK_MEMALLOC)); | |
335 | ||
336 | current->flags |= PF_MEMALLOC; | |
337 | ret = sk->sk_backlog_rcv(sk, skb); | |
338 | tsk_restore_flags(current, pflags, PF_MEMALLOC); | |
339 | ||
340 | return ret; | |
341 | } | |
342 | EXPORT_SYMBOL(__sk_backlog_rcv); | |
343 | ||
1da177e4 LT |
344 | static int sock_set_timeout(long *timeo_p, char __user *optval, int optlen) |
345 | { | |
346 | struct timeval tv; | |
347 | ||
348 | if (optlen < sizeof(tv)) | |
349 | return -EINVAL; | |
350 | if (copy_from_user(&tv, optval, sizeof(tv))) | |
351 | return -EFAULT; | |
ba78073e VA |
352 | if (tv.tv_usec < 0 || tv.tv_usec >= USEC_PER_SEC) |
353 | return -EDOM; | |
1da177e4 | 354 | |
ba78073e | 355 | if (tv.tv_sec < 0) { |
6f11df83 AM |
356 | static int warned __read_mostly; |
357 | ||
ba78073e | 358 | *timeo_p = 0; |
50aab54f | 359 | if (warned < 10 && net_ratelimit()) { |
ba78073e | 360 | warned++; |
e005d193 JP |
361 | pr_info("%s: `%s' (pid %d) tries to set negative timeout\n", |
362 | __func__, current->comm, task_pid_nr(current)); | |
50aab54f | 363 | } |
ba78073e VA |
364 | return 0; |
365 | } | |
1da177e4 LT |
366 | *timeo_p = MAX_SCHEDULE_TIMEOUT; |
367 | if (tv.tv_sec == 0 && tv.tv_usec == 0) | |
368 | return 0; | |
369 | if (tv.tv_sec < (MAX_SCHEDULE_TIMEOUT/HZ - 1)) | |
370 | *timeo_p = tv.tv_sec*HZ + (tv.tv_usec+(1000000/HZ-1))/(1000000/HZ); | |
371 | return 0; | |
372 | } | |
373 | ||
374 | static void sock_warn_obsolete_bsdism(const char *name) | |
375 | { | |
376 | static int warned; | |
377 | static char warncomm[TASK_COMM_LEN]; | |
4ec93edb YH |
378 | if (strcmp(warncomm, current->comm) && warned < 5) { |
379 | strcpy(warncomm, current->comm); | |
e005d193 JP |
380 | pr_warn("process `%s' is using obsolete %s SO_BSDCOMPAT\n", |
381 | warncomm, name); | |
1da177e4 LT |
382 | warned++; |
383 | } | |
384 | } | |
385 | ||
080a270f HFS |
386 | static bool sock_needs_netstamp(const struct sock *sk) |
387 | { | |
388 | switch (sk->sk_family) { | |
389 | case AF_UNSPEC: | |
390 | case AF_UNIX: | |
391 | return false; | |
392 | default: | |
393 | return true; | |
394 | } | |
395 | } | |
396 | ||
08e29af3 | 397 | static void sock_disable_timestamp(struct sock *sk, unsigned long flags) |
4ec93edb | 398 | { |
08e29af3 ED |
399 | if (sk->sk_flags & flags) { |
400 | sk->sk_flags &= ~flags; | |
080a270f HFS |
401 | if (sock_needs_netstamp(sk) && |
402 | !(sk->sk_flags & SK_FLAGS_TIMESTAMP)) | |
20d49473 | 403 | net_disable_timestamp(); |
1da177e4 LT |
404 | } |
405 | } | |
406 | ||
407 | ||
f0088a50 DV |
408 | int sock_queue_rcv_skb(struct sock *sk, struct sk_buff *skb) |
409 | { | |
766e9037 | 410 | int err; |
3b885787 NH |
411 | unsigned long flags; |
412 | struct sk_buff_head *list = &sk->sk_receive_queue; | |
f0088a50 | 413 | |
0fd7bac6 | 414 | if (atomic_read(&sk->sk_rmem_alloc) >= sk->sk_rcvbuf) { |
766e9037 | 415 | atomic_inc(&sk->sk_drops); |
3847ce32 | 416 | trace_sock_rcvqueue_full(sk, skb); |
766e9037 | 417 | return -ENOMEM; |
f0088a50 DV |
418 | } |
419 | ||
fda9ef5d | 420 | err = sk_filter(sk, skb); |
f0088a50 | 421 | if (err) |
766e9037 | 422 | return err; |
f0088a50 | 423 | |
c76562b6 | 424 | if (!sk_rmem_schedule(sk, skb, skb->truesize)) { |
766e9037 ED |
425 | atomic_inc(&sk->sk_drops); |
426 | return -ENOBUFS; | |
3ab224be HA |
427 | } |
428 | ||
f0088a50 DV |
429 | skb->dev = NULL; |
430 | skb_set_owner_r(skb, sk); | |
49ad9599 | 431 | |
7fee226a ED |
432 | /* we escape from rcu protected region, make sure we dont leak |
433 | * a norefcounted dst | |
434 | */ | |
435 | skb_dst_force(skb); | |
436 | ||
3b885787 | 437 | spin_lock_irqsave(&list->lock, flags); |
3bc3b96f | 438 | sock_skb_set_dropcount(sk, skb); |
3b885787 NH |
439 | __skb_queue_tail(list, skb); |
440 | spin_unlock_irqrestore(&list->lock, flags); | |
f0088a50 DV |
441 | |
442 | if (!sock_flag(sk, SOCK_DEAD)) | |
676d2369 | 443 | sk->sk_data_ready(sk); |
766e9037 | 444 | return 0; |
f0088a50 DV |
445 | } |
446 | EXPORT_SYMBOL(sock_queue_rcv_skb); | |
447 | ||
58a5a7b9 | 448 | int sk_receive_skb(struct sock *sk, struct sk_buff *skb, const int nested) |
f0088a50 DV |
449 | { |
450 | int rc = NET_RX_SUCCESS; | |
451 | ||
fda9ef5d | 452 | if (sk_filter(sk, skb)) |
f0088a50 DV |
453 | goto discard_and_relse; |
454 | ||
455 | skb->dev = NULL; | |
456 | ||
274f482d | 457 | if (sk_rcvqueues_full(sk, sk->sk_rcvbuf)) { |
c377411f ED |
458 | atomic_inc(&sk->sk_drops); |
459 | goto discard_and_relse; | |
460 | } | |
58a5a7b9 ACM |
461 | if (nested) |
462 | bh_lock_sock_nested(sk); | |
463 | else | |
464 | bh_lock_sock(sk); | |
a5b5bb9a IM |
465 | if (!sock_owned_by_user(sk)) { |
466 | /* | |
467 | * trylock + unlock semantics: | |
468 | */ | |
469 | mutex_acquire(&sk->sk_lock.dep_map, 0, 1, _RET_IP_); | |
470 | ||
c57943a1 | 471 | rc = sk_backlog_rcv(sk, skb); |
a5b5bb9a IM |
472 | |
473 | mutex_release(&sk->sk_lock.dep_map, 1, _RET_IP_); | |
f545a38f | 474 | } else if (sk_add_backlog(sk, skb, sk->sk_rcvbuf)) { |
8eae939f ZY |
475 | bh_unlock_sock(sk); |
476 | atomic_inc(&sk->sk_drops); | |
477 | goto discard_and_relse; | |
478 | } | |
479 | ||
f0088a50 DV |
480 | bh_unlock_sock(sk); |
481 | out: | |
482 | sock_put(sk); | |
483 | return rc; | |
484 | discard_and_relse: | |
485 | kfree_skb(skb); | |
486 | goto out; | |
487 | } | |
488 | EXPORT_SYMBOL(sk_receive_skb); | |
489 | ||
490 | struct dst_entry *__sk_dst_check(struct sock *sk, u32 cookie) | |
491 | { | |
b6c6712a | 492 | struct dst_entry *dst = __sk_dst_get(sk); |
f0088a50 DV |
493 | |
494 | if (dst && dst->obsolete && dst->ops->check(dst, cookie) == NULL) { | |
e022f0b4 | 495 | sk_tx_queue_clear(sk); |
a9b3cd7f | 496 | RCU_INIT_POINTER(sk->sk_dst_cache, NULL); |
f0088a50 DV |
497 | dst_release(dst); |
498 | return NULL; | |
499 | } | |
500 | ||
501 | return dst; | |
502 | } | |
503 | EXPORT_SYMBOL(__sk_dst_check); | |
504 | ||
505 | struct dst_entry *sk_dst_check(struct sock *sk, u32 cookie) | |
506 | { | |
507 | struct dst_entry *dst = sk_dst_get(sk); | |
508 | ||
509 | if (dst && dst->obsolete && dst->ops->check(dst, cookie) == NULL) { | |
510 | sk_dst_reset(sk); | |
511 | dst_release(dst); | |
512 | return NULL; | |
513 | } | |
514 | ||
515 | return dst; | |
516 | } | |
517 | EXPORT_SYMBOL(sk_dst_check); | |
518 | ||
c91f6df2 BH |
519 | static int sock_setbindtodevice(struct sock *sk, char __user *optval, |
520 | int optlen) | |
4878809f DM |
521 | { |
522 | int ret = -ENOPROTOOPT; | |
523 | #ifdef CONFIG_NETDEVICES | |
3b1e0a65 | 524 | struct net *net = sock_net(sk); |
4878809f DM |
525 | char devname[IFNAMSIZ]; |
526 | int index; | |
527 | ||
528 | /* Sorry... */ | |
529 | ret = -EPERM; | |
5e1fccc0 | 530 | if (!ns_capable(net->user_ns, CAP_NET_RAW)) |
4878809f DM |
531 | goto out; |
532 | ||
533 | ret = -EINVAL; | |
534 | if (optlen < 0) | |
535 | goto out; | |
536 | ||
537 | /* Bind this socket to a particular device like "eth0", | |
538 | * as specified in the passed interface name. If the | |
539 | * name is "" or the option length is zero the socket | |
540 | * is not bound. | |
541 | */ | |
542 | if (optlen > IFNAMSIZ - 1) | |
543 | optlen = IFNAMSIZ - 1; | |
544 | memset(devname, 0, sizeof(devname)); | |
545 | ||
546 | ret = -EFAULT; | |
547 | if (copy_from_user(devname, optval, optlen)) | |
548 | goto out; | |
549 | ||
000ba2e4 DM |
550 | index = 0; |
551 | if (devname[0] != '\0') { | |
bf8e56bf | 552 | struct net_device *dev; |
4878809f | 553 | |
bf8e56bf ED |
554 | rcu_read_lock(); |
555 | dev = dev_get_by_name_rcu(net, devname); | |
556 | if (dev) | |
557 | index = dev->ifindex; | |
558 | rcu_read_unlock(); | |
4878809f DM |
559 | ret = -ENODEV; |
560 | if (!dev) | |
561 | goto out; | |
4878809f DM |
562 | } |
563 | ||
564 | lock_sock(sk); | |
565 | sk->sk_bound_dev_if = index; | |
566 | sk_dst_reset(sk); | |
567 | release_sock(sk); | |
568 | ||
569 | ret = 0; | |
570 | ||
571 | out: | |
572 | #endif | |
573 | ||
574 | return ret; | |
575 | } | |
576 | ||
c91f6df2 BH |
577 | static int sock_getbindtodevice(struct sock *sk, char __user *optval, |
578 | int __user *optlen, int len) | |
579 | { | |
580 | int ret = -ENOPROTOOPT; | |
581 | #ifdef CONFIG_NETDEVICES | |
582 | struct net *net = sock_net(sk); | |
c91f6df2 | 583 | char devname[IFNAMSIZ]; |
c91f6df2 BH |
584 | |
585 | if (sk->sk_bound_dev_if == 0) { | |
586 | len = 0; | |
587 | goto zero; | |
588 | } | |
589 | ||
590 | ret = -EINVAL; | |
591 | if (len < IFNAMSIZ) | |
592 | goto out; | |
593 | ||
5dbe7c17 NS |
594 | ret = netdev_get_name(net, devname, sk->sk_bound_dev_if); |
595 | if (ret) | |
c91f6df2 | 596 | goto out; |
c91f6df2 BH |
597 | |
598 | len = strlen(devname) + 1; | |
599 | ||
600 | ret = -EFAULT; | |
601 | if (copy_to_user(optval, devname, len)) | |
602 | goto out; | |
603 | ||
604 | zero: | |
605 | ret = -EFAULT; | |
606 | if (put_user(len, optlen)) | |
607 | goto out; | |
608 | ||
609 | ret = 0; | |
610 | ||
611 | out: | |
612 | #endif | |
613 | ||
614 | return ret; | |
615 | } | |
616 | ||
c0ef877b PE |
617 | static inline void sock_valbool_flag(struct sock *sk, int bit, int valbool) |
618 | { | |
619 | if (valbool) | |
620 | sock_set_flag(sk, bit); | |
621 | else | |
622 | sock_reset_flag(sk, bit); | |
623 | } | |
624 | ||
f60e5990 | 625 | bool sk_mc_loop(struct sock *sk) |
626 | { | |
627 | if (dev_recursion_level()) | |
628 | return false; | |
629 | if (!sk) | |
630 | return true; | |
631 | switch (sk->sk_family) { | |
632 | case AF_INET: | |
633 | return inet_sk(sk)->mc_loop; | |
634 | #if IS_ENABLED(CONFIG_IPV6) | |
635 | case AF_INET6: | |
636 | return inet6_sk(sk)->mc_loop; | |
637 | #endif | |
638 | } | |
639 | WARN_ON(1); | |
640 | return true; | |
641 | } | |
642 | EXPORT_SYMBOL(sk_mc_loop); | |
643 | ||
1da177e4 LT |
644 | /* |
645 | * This is meant for all protocols to use and covers goings on | |
646 | * at the socket level. Everything here is generic. | |
647 | */ | |
648 | ||
649 | int sock_setsockopt(struct socket *sock, int level, int optname, | |
b7058842 | 650 | char __user *optval, unsigned int optlen) |
1da177e4 | 651 | { |
2a91525c | 652 | struct sock *sk = sock->sk; |
1da177e4 LT |
653 | int val; |
654 | int valbool; | |
655 | struct linger ling; | |
656 | int ret = 0; | |
4ec93edb | 657 | |
1da177e4 LT |
658 | /* |
659 | * Options without arguments | |
660 | */ | |
661 | ||
4878809f | 662 | if (optname == SO_BINDTODEVICE) |
c91f6df2 | 663 | return sock_setbindtodevice(sk, optval, optlen); |
4878809f | 664 | |
e71a4783 SH |
665 | if (optlen < sizeof(int)) |
666 | return -EINVAL; | |
4ec93edb | 667 | |
1da177e4 LT |
668 | if (get_user(val, (int __user *)optval)) |
669 | return -EFAULT; | |
4ec93edb | 670 | |
2a91525c | 671 | valbool = val ? 1 : 0; |
1da177e4 LT |
672 | |
673 | lock_sock(sk); | |
674 | ||
2a91525c | 675 | switch (optname) { |
e71a4783 | 676 | case SO_DEBUG: |
2a91525c | 677 | if (val && !capable(CAP_NET_ADMIN)) |
e71a4783 | 678 | ret = -EACCES; |
2a91525c | 679 | else |
c0ef877b | 680 | sock_valbool_flag(sk, SOCK_DBG, valbool); |
e71a4783 SH |
681 | break; |
682 | case SO_REUSEADDR: | |
4a17fd52 | 683 | sk->sk_reuse = (valbool ? SK_CAN_REUSE : SK_NO_REUSE); |
e71a4783 | 684 | break; |
055dc21a TH |
685 | case SO_REUSEPORT: |
686 | sk->sk_reuseport = valbool; | |
687 | break; | |
e71a4783 | 688 | case SO_TYPE: |
49c794e9 | 689 | case SO_PROTOCOL: |
0d6038ee | 690 | case SO_DOMAIN: |
e71a4783 SH |
691 | case SO_ERROR: |
692 | ret = -ENOPROTOOPT; | |
693 | break; | |
694 | case SO_DONTROUTE: | |
c0ef877b | 695 | sock_valbool_flag(sk, SOCK_LOCALROUTE, valbool); |
e71a4783 SH |
696 | break; |
697 | case SO_BROADCAST: | |
698 | sock_valbool_flag(sk, SOCK_BROADCAST, valbool); | |
699 | break; | |
700 | case SO_SNDBUF: | |
701 | /* Don't error on this BSD doesn't and if you think | |
82981930 ED |
702 | * about it this is right. Otherwise apps have to |
703 | * play 'guess the biggest size' games. RCVBUF/SNDBUF | |
704 | * are treated in BSD as hints | |
705 | */ | |
706 | val = min_t(u32, val, sysctl_wmem_max); | |
b0573dea | 707 | set_sndbuf: |
e71a4783 | 708 | sk->sk_userlocks |= SOCK_SNDBUF_LOCK; |
82981930 ED |
709 | sk->sk_sndbuf = max_t(u32, val * 2, SOCK_MIN_SNDBUF); |
710 | /* Wake up sending tasks if we upped the value. */ | |
e71a4783 SH |
711 | sk->sk_write_space(sk); |
712 | break; | |
1da177e4 | 713 | |
e71a4783 SH |
714 | case SO_SNDBUFFORCE: |
715 | if (!capable(CAP_NET_ADMIN)) { | |
716 | ret = -EPERM; | |
717 | break; | |
718 | } | |
719 | goto set_sndbuf; | |
b0573dea | 720 | |
e71a4783 SH |
721 | case SO_RCVBUF: |
722 | /* Don't error on this BSD doesn't and if you think | |
82981930 ED |
723 | * about it this is right. Otherwise apps have to |
724 | * play 'guess the biggest size' games. RCVBUF/SNDBUF | |
725 | * are treated in BSD as hints | |
726 | */ | |
727 | val = min_t(u32, val, sysctl_rmem_max); | |
b0573dea | 728 | set_rcvbuf: |
e71a4783 SH |
729 | sk->sk_userlocks |= SOCK_RCVBUF_LOCK; |
730 | /* | |
731 | * We double it on the way in to account for | |
732 | * "struct sk_buff" etc. overhead. Applications | |
733 | * assume that the SO_RCVBUF setting they make will | |
734 | * allow that much actual data to be received on that | |
735 | * socket. | |
736 | * | |
737 | * Applications are unaware that "struct sk_buff" and | |
738 | * other overheads allocate from the receive buffer | |
739 | * during socket buffer allocation. | |
740 | * | |
741 | * And after considering the possible alternatives, | |
742 | * returning the value we actually used in getsockopt | |
743 | * is the most desirable behavior. | |
744 | */ | |
82981930 | 745 | sk->sk_rcvbuf = max_t(u32, val * 2, SOCK_MIN_RCVBUF); |
e71a4783 SH |
746 | break; |
747 | ||
748 | case SO_RCVBUFFORCE: | |
749 | if (!capable(CAP_NET_ADMIN)) { | |
750 | ret = -EPERM; | |
1da177e4 | 751 | break; |
e71a4783 SH |
752 | } |
753 | goto set_rcvbuf; | |
1da177e4 | 754 | |
e71a4783 | 755 | case SO_KEEPALIVE: |
1da177e4 | 756 | #ifdef CONFIG_INET |
3e10986d ED |
757 | if (sk->sk_protocol == IPPROTO_TCP && |
758 | sk->sk_type == SOCK_STREAM) | |
e71a4783 | 759 | tcp_set_keepalive(sk, valbool); |
1da177e4 | 760 | #endif |
e71a4783 SH |
761 | sock_valbool_flag(sk, SOCK_KEEPOPEN, valbool); |
762 | break; | |
763 | ||
764 | case SO_OOBINLINE: | |
765 | sock_valbool_flag(sk, SOCK_URGINLINE, valbool); | |
766 | break; | |
767 | ||
768 | case SO_NO_CHECK: | |
28448b80 | 769 | sk->sk_no_check_tx = valbool; |
e71a4783 SH |
770 | break; |
771 | ||
772 | case SO_PRIORITY: | |
5e1fccc0 EB |
773 | if ((val >= 0 && val <= 6) || |
774 | ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN)) | |
e71a4783 SH |
775 | sk->sk_priority = val; |
776 | else | |
777 | ret = -EPERM; | |
778 | break; | |
779 | ||
780 | case SO_LINGER: | |
781 | if (optlen < sizeof(ling)) { | |
782 | ret = -EINVAL; /* 1003.1g */ | |
1da177e4 | 783 | break; |
e71a4783 | 784 | } |
2a91525c | 785 | if (copy_from_user(&ling, optval, sizeof(ling))) { |
e71a4783 | 786 | ret = -EFAULT; |
1da177e4 | 787 | break; |
e71a4783 SH |
788 | } |
789 | if (!ling.l_onoff) | |
790 | sock_reset_flag(sk, SOCK_LINGER); | |
791 | else { | |
1da177e4 | 792 | #if (BITS_PER_LONG == 32) |
e71a4783 SH |
793 | if ((unsigned int)ling.l_linger >= MAX_SCHEDULE_TIMEOUT/HZ) |
794 | sk->sk_lingertime = MAX_SCHEDULE_TIMEOUT; | |
1da177e4 | 795 | else |
e71a4783 SH |
796 | #endif |
797 | sk->sk_lingertime = (unsigned int)ling.l_linger * HZ; | |
798 | sock_set_flag(sk, SOCK_LINGER); | |
799 | } | |
800 | break; | |
801 | ||
802 | case SO_BSDCOMPAT: | |
803 | sock_warn_obsolete_bsdism("setsockopt"); | |
804 | break; | |
805 | ||
806 | case SO_PASSCRED: | |
807 | if (valbool) | |
808 | set_bit(SOCK_PASSCRED, &sock->flags); | |
809 | else | |
810 | clear_bit(SOCK_PASSCRED, &sock->flags); | |
811 | break; | |
812 | ||
813 | case SO_TIMESTAMP: | |
92f37fd2 | 814 | case SO_TIMESTAMPNS: |
e71a4783 | 815 | if (valbool) { |
92f37fd2 ED |
816 | if (optname == SO_TIMESTAMP) |
817 | sock_reset_flag(sk, SOCK_RCVTSTAMPNS); | |
818 | else | |
819 | sock_set_flag(sk, SOCK_RCVTSTAMPNS); | |
e71a4783 | 820 | sock_set_flag(sk, SOCK_RCVTSTAMP); |
20d49473 | 821 | sock_enable_timestamp(sk, SOCK_TIMESTAMP); |
92f37fd2 | 822 | } else { |
e71a4783 | 823 | sock_reset_flag(sk, SOCK_RCVTSTAMP); |
92f37fd2 ED |
824 | sock_reset_flag(sk, SOCK_RCVTSTAMPNS); |
825 | } | |
e71a4783 SH |
826 | break; |
827 | ||
20d49473 PO |
828 | case SO_TIMESTAMPING: |
829 | if (val & ~SOF_TIMESTAMPING_MASK) { | |
f249fb78 | 830 | ret = -EINVAL; |
20d49473 PO |
831 | break; |
832 | } | |
b245be1f | 833 | |
09c2d251 | 834 | if (val & SOF_TIMESTAMPING_OPT_ID && |
4ed2d765 | 835 | !(sk->sk_tsflags & SOF_TIMESTAMPING_OPT_ID)) { |
ac5cc977 WC |
836 | if (sk->sk_protocol == IPPROTO_TCP && |
837 | sk->sk_type == SOCK_STREAM) { | |
4ed2d765 WB |
838 | if (sk->sk_state != TCP_ESTABLISHED) { |
839 | ret = -EINVAL; | |
840 | break; | |
841 | } | |
842 | sk->sk_tskey = tcp_sk(sk)->snd_una; | |
843 | } else { | |
844 | sk->sk_tskey = 0; | |
845 | } | |
846 | } | |
b9f40e21 | 847 | sk->sk_tsflags = val; |
20d49473 PO |
848 | if (val & SOF_TIMESTAMPING_RX_SOFTWARE) |
849 | sock_enable_timestamp(sk, | |
850 | SOCK_TIMESTAMPING_RX_SOFTWARE); | |
851 | else | |
852 | sock_disable_timestamp(sk, | |
08e29af3 | 853 | (1UL << SOCK_TIMESTAMPING_RX_SOFTWARE)); |
20d49473 PO |
854 | break; |
855 | ||
e71a4783 SH |
856 | case SO_RCVLOWAT: |
857 | if (val < 0) | |
858 | val = INT_MAX; | |
859 | sk->sk_rcvlowat = val ? : 1; | |
860 | break; | |
861 | ||
862 | case SO_RCVTIMEO: | |
863 | ret = sock_set_timeout(&sk->sk_rcvtimeo, optval, optlen); | |
864 | break; | |
865 | ||
866 | case SO_SNDTIMEO: | |
867 | ret = sock_set_timeout(&sk->sk_sndtimeo, optval, optlen); | |
868 | break; | |
1da177e4 | 869 | |
e71a4783 SH |
870 | case SO_ATTACH_FILTER: |
871 | ret = -EINVAL; | |
872 | if (optlen == sizeof(struct sock_fprog)) { | |
873 | struct sock_fprog fprog; | |
1da177e4 | 874 | |
e71a4783 SH |
875 | ret = -EFAULT; |
876 | if (copy_from_user(&fprog, optval, sizeof(fprog))) | |
1da177e4 | 877 | break; |
e71a4783 SH |
878 | |
879 | ret = sk_attach_filter(&fprog, sk); | |
880 | } | |
881 | break; | |
882 | ||
89aa0758 AS |
883 | case SO_ATTACH_BPF: |
884 | ret = -EINVAL; | |
885 | if (optlen == sizeof(u32)) { | |
886 | u32 ufd; | |
887 | ||
888 | ret = -EFAULT; | |
889 | if (copy_from_user(&ufd, optval, sizeof(ufd))) | |
890 | break; | |
891 | ||
892 | ret = sk_attach_bpf(ufd, sk); | |
893 | } | |
894 | break; | |
895 | ||
538950a1 CG |
896 | case SO_ATTACH_REUSEPORT_CBPF: |
897 | ret = -EINVAL; | |
898 | if (optlen == sizeof(struct sock_fprog)) { | |
899 | struct sock_fprog fprog; | |
900 | ||
901 | ret = -EFAULT; | |
902 | if (copy_from_user(&fprog, optval, sizeof(fprog))) | |
903 | break; | |
904 | ||
905 | ret = sk_reuseport_attach_filter(&fprog, sk); | |
906 | } | |
907 | break; | |
908 | ||
909 | case SO_ATTACH_REUSEPORT_EBPF: | |
910 | ret = -EINVAL; | |
911 | if (optlen == sizeof(u32)) { | |
912 | u32 ufd; | |
913 | ||
914 | ret = -EFAULT; | |
915 | if (copy_from_user(&ufd, optval, sizeof(ufd))) | |
916 | break; | |
917 | ||
918 | ret = sk_reuseport_attach_bpf(ufd, sk); | |
919 | } | |
920 | break; | |
921 | ||
e71a4783 | 922 | case SO_DETACH_FILTER: |
55b33325 | 923 | ret = sk_detach_filter(sk); |
e71a4783 | 924 | break; |
1da177e4 | 925 | |
d59577b6 VB |
926 | case SO_LOCK_FILTER: |
927 | if (sock_flag(sk, SOCK_FILTER_LOCKED) && !valbool) | |
928 | ret = -EPERM; | |
929 | else | |
930 | sock_valbool_flag(sk, SOCK_FILTER_LOCKED, valbool); | |
931 | break; | |
932 | ||
e71a4783 SH |
933 | case SO_PASSSEC: |
934 | if (valbool) | |
935 | set_bit(SOCK_PASSSEC, &sock->flags); | |
936 | else | |
937 | clear_bit(SOCK_PASSSEC, &sock->flags); | |
938 | break; | |
4a19ec58 | 939 | case SO_MARK: |
5e1fccc0 | 940 | if (!ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN)) |
4a19ec58 | 941 | ret = -EPERM; |
2a91525c | 942 | else |
4a19ec58 | 943 | sk->sk_mark = val; |
4a19ec58 | 944 | break; |
877ce7c1 | 945 | |
3b885787 | 946 | case SO_RXQ_OVFL: |
8083f0fc | 947 | sock_valbool_flag(sk, SOCK_RXQ_OVFL, valbool); |
3b885787 | 948 | break; |
6e3e939f JB |
949 | |
950 | case SO_WIFI_STATUS: | |
951 | sock_valbool_flag(sk, SOCK_WIFI_STATUS, valbool); | |
952 | break; | |
953 | ||
ef64a54f PE |
954 | case SO_PEEK_OFF: |
955 | if (sock->ops->set_peek_off) | |
12663bfc | 956 | ret = sock->ops->set_peek_off(sk, val); |
ef64a54f PE |
957 | else |
958 | ret = -EOPNOTSUPP; | |
959 | break; | |
3bdc0eba BG |
960 | |
961 | case SO_NOFCS: | |
962 | sock_valbool_flag(sk, SOCK_NOFCS, valbool); | |
963 | break; | |
964 | ||
7d4c04fc KJ |
965 | case SO_SELECT_ERR_QUEUE: |
966 | sock_valbool_flag(sk, SOCK_SELECT_ERR_QUEUE, valbool); | |
967 | break; | |
968 | ||
e0d1095a | 969 | #ifdef CONFIG_NET_RX_BUSY_POLL |
64b0dc51 | 970 | case SO_BUSY_POLL: |
dafcc438 ET |
971 | /* allow unprivileged users to decrease the value */ |
972 | if ((val > sk->sk_ll_usec) && !capable(CAP_NET_ADMIN)) | |
973 | ret = -EPERM; | |
974 | else { | |
975 | if (val < 0) | |
976 | ret = -EINVAL; | |
977 | else | |
978 | sk->sk_ll_usec = val; | |
979 | } | |
980 | break; | |
981 | #endif | |
62748f32 ED |
982 | |
983 | case SO_MAX_PACING_RATE: | |
984 | sk->sk_max_pacing_rate = val; | |
985 | sk->sk_pacing_rate = min(sk->sk_pacing_rate, | |
986 | sk->sk_max_pacing_rate); | |
987 | break; | |
988 | ||
70da268b ED |
989 | case SO_INCOMING_CPU: |
990 | sk->sk_incoming_cpu = val; | |
991 | break; | |
992 | ||
a87cb3e4 TH |
993 | case SO_CNX_ADVICE: |
994 | if (val == 1) | |
995 | dst_negative_advice(sk); | |
996 | break; | |
e71a4783 SH |
997 | default: |
998 | ret = -ENOPROTOOPT; | |
999 | break; | |
4ec93edb | 1000 | } |
1da177e4 LT |
1001 | release_sock(sk); |
1002 | return ret; | |
1003 | } | |
2a91525c | 1004 | EXPORT_SYMBOL(sock_setsockopt); |
1da177e4 LT |
1005 | |
1006 | ||
8f09898b | 1007 | static void cred_to_ucred(struct pid *pid, const struct cred *cred, |
1008 | struct ucred *ucred) | |
3f551f94 EB |
1009 | { |
1010 | ucred->pid = pid_vnr(pid); | |
1011 | ucred->uid = ucred->gid = -1; | |
1012 | if (cred) { | |
1013 | struct user_namespace *current_ns = current_user_ns(); | |
1014 | ||
b2e4f544 EB |
1015 | ucred->uid = from_kuid_munged(current_ns, cred->euid); |
1016 | ucred->gid = from_kgid_munged(current_ns, cred->egid); | |
3f551f94 EB |
1017 | } |
1018 | } | |
1019 | ||
1da177e4 LT |
1020 | int sock_getsockopt(struct socket *sock, int level, int optname, |
1021 | char __user *optval, int __user *optlen) | |
1022 | { | |
1023 | struct sock *sk = sock->sk; | |
4ec93edb | 1024 | |
e71a4783 | 1025 | union { |
4ec93edb YH |
1026 | int val; |
1027 | struct linger ling; | |
1da177e4 LT |
1028 | struct timeval tm; |
1029 | } v; | |
4ec93edb | 1030 | |
4d0392be | 1031 | int lv = sizeof(int); |
1da177e4 | 1032 | int len; |
4ec93edb | 1033 | |
e71a4783 | 1034 | if (get_user(len, optlen)) |
4ec93edb | 1035 | return -EFAULT; |
e71a4783 | 1036 | if (len < 0) |
1da177e4 | 1037 | return -EINVAL; |
4ec93edb | 1038 | |
50fee1de | 1039 | memset(&v, 0, sizeof(v)); |
df0bca04 | 1040 | |
2a91525c | 1041 | switch (optname) { |
e71a4783 SH |
1042 | case SO_DEBUG: |
1043 | v.val = sock_flag(sk, SOCK_DBG); | |
1044 | break; | |
1045 | ||
1046 | case SO_DONTROUTE: | |
1047 | v.val = sock_flag(sk, SOCK_LOCALROUTE); | |
1048 | break; | |
1049 | ||
1050 | case SO_BROADCAST: | |
1b23a5df | 1051 | v.val = sock_flag(sk, SOCK_BROADCAST); |
e71a4783 SH |
1052 | break; |
1053 | ||
1054 | case SO_SNDBUF: | |
1055 | v.val = sk->sk_sndbuf; | |
1056 | break; | |
1057 | ||
1058 | case SO_RCVBUF: | |
1059 | v.val = sk->sk_rcvbuf; | |
1060 | break; | |
1061 | ||
1062 | case SO_REUSEADDR: | |
1063 | v.val = sk->sk_reuse; | |
1064 | break; | |
1065 | ||
055dc21a TH |
1066 | case SO_REUSEPORT: |
1067 | v.val = sk->sk_reuseport; | |
1068 | break; | |
1069 | ||
e71a4783 | 1070 | case SO_KEEPALIVE: |
1b23a5df | 1071 | v.val = sock_flag(sk, SOCK_KEEPOPEN); |
e71a4783 SH |
1072 | break; |
1073 | ||
1074 | case SO_TYPE: | |
1075 | v.val = sk->sk_type; | |
1076 | break; | |
1077 | ||
49c794e9 JE |
1078 | case SO_PROTOCOL: |
1079 | v.val = sk->sk_protocol; | |
1080 | break; | |
1081 | ||
0d6038ee JE |
1082 | case SO_DOMAIN: |
1083 | v.val = sk->sk_family; | |
1084 | break; | |
1085 | ||
e71a4783 SH |
1086 | case SO_ERROR: |
1087 | v.val = -sock_error(sk); | |
2a91525c | 1088 | if (v.val == 0) |
e71a4783 SH |
1089 | v.val = xchg(&sk->sk_err_soft, 0); |
1090 | break; | |
1091 | ||
1092 | case SO_OOBINLINE: | |
1b23a5df | 1093 | v.val = sock_flag(sk, SOCK_URGINLINE); |
e71a4783 SH |
1094 | break; |
1095 | ||
1096 | case SO_NO_CHECK: | |
28448b80 | 1097 | v.val = sk->sk_no_check_tx; |
e71a4783 SH |
1098 | break; |
1099 | ||
1100 | case SO_PRIORITY: | |
1101 | v.val = sk->sk_priority; | |
1102 | break; | |
1103 | ||
1104 | case SO_LINGER: | |
1105 | lv = sizeof(v.ling); | |
1b23a5df | 1106 | v.ling.l_onoff = sock_flag(sk, SOCK_LINGER); |
e71a4783 SH |
1107 | v.ling.l_linger = sk->sk_lingertime / HZ; |
1108 | break; | |
1109 | ||
1110 | case SO_BSDCOMPAT: | |
1111 | sock_warn_obsolete_bsdism("getsockopt"); | |
1112 | break; | |
1113 | ||
1114 | case SO_TIMESTAMP: | |
92f37fd2 ED |
1115 | v.val = sock_flag(sk, SOCK_RCVTSTAMP) && |
1116 | !sock_flag(sk, SOCK_RCVTSTAMPNS); | |
1117 | break; | |
1118 | ||
1119 | case SO_TIMESTAMPNS: | |
1120 | v.val = sock_flag(sk, SOCK_RCVTSTAMPNS); | |
e71a4783 SH |
1121 | break; |
1122 | ||
20d49473 | 1123 | case SO_TIMESTAMPING: |
b9f40e21 | 1124 | v.val = sk->sk_tsflags; |
20d49473 PO |
1125 | break; |
1126 | ||
e71a4783 | 1127 | case SO_RCVTIMEO: |
2a91525c | 1128 | lv = sizeof(struct timeval); |
e71a4783 SH |
1129 | if (sk->sk_rcvtimeo == MAX_SCHEDULE_TIMEOUT) { |
1130 | v.tm.tv_sec = 0; | |
1131 | v.tm.tv_usec = 0; | |
1132 | } else { | |
1133 | v.tm.tv_sec = sk->sk_rcvtimeo / HZ; | |
1134 | v.tm.tv_usec = ((sk->sk_rcvtimeo % HZ) * 1000000) / HZ; | |
1135 | } | |
1136 | break; | |
1137 | ||
1138 | case SO_SNDTIMEO: | |
2a91525c | 1139 | lv = sizeof(struct timeval); |
e71a4783 SH |
1140 | if (sk->sk_sndtimeo == MAX_SCHEDULE_TIMEOUT) { |
1141 | v.tm.tv_sec = 0; | |
1142 | v.tm.tv_usec = 0; | |
1143 | } else { | |
1144 | v.tm.tv_sec = sk->sk_sndtimeo / HZ; | |
1145 | v.tm.tv_usec = ((sk->sk_sndtimeo % HZ) * 1000000) / HZ; | |
1146 | } | |
1147 | break; | |
1da177e4 | 1148 | |
e71a4783 SH |
1149 | case SO_RCVLOWAT: |
1150 | v.val = sk->sk_rcvlowat; | |
1151 | break; | |
1da177e4 | 1152 | |
e71a4783 | 1153 | case SO_SNDLOWAT: |
2a91525c | 1154 | v.val = 1; |
e71a4783 | 1155 | break; |
1da177e4 | 1156 | |
e71a4783 | 1157 | case SO_PASSCRED: |
82981930 | 1158 | v.val = !!test_bit(SOCK_PASSCRED, &sock->flags); |
e71a4783 | 1159 | break; |
1da177e4 | 1160 | |
e71a4783 | 1161 | case SO_PEERCRED: |
109f6e39 EB |
1162 | { |
1163 | struct ucred peercred; | |
1164 | if (len > sizeof(peercred)) | |
1165 | len = sizeof(peercred); | |
1166 | cred_to_ucred(sk->sk_peer_pid, sk->sk_peer_cred, &peercred); | |
1167 | if (copy_to_user(optval, &peercred, len)) | |
e71a4783 SH |
1168 | return -EFAULT; |
1169 | goto lenout; | |
109f6e39 | 1170 | } |
1da177e4 | 1171 | |
e71a4783 SH |
1172 | case SO_PEERNAME: |
1173 | { | |
1174 | char address[128]; | |
1175 | ||
1176 | if (sock->ops->getname(sock, (struct sockaddr *)address, &lv, 2)) | |
1177 | return -ENOTCONN; | |
1178 | if (lv < len) | |
1179 | return -EINVAL; | |
1180 | if (copy_to_user(optval, address, len)) | |
1181 | return -EFAULT; | |
1182 | goto lenout; | |
1183 | } | |
1da177e4 | 1184 | |
e71a4783 SH |
1185 | /* Dubious BSD thing... Probably nobody even uses it, but |
1186 | * the UNIX standard wants it for whatever reason... -DaveM | |
1187 | */ | |
1188 | case SO_ACCEPTCONN: | |
1189 | v.val = sk->sk_state == TCP_LISTEN; | |
1190 | break; | |
1da177e4 | 1191 | |
e71a4783 | 1192 | case SO_PASSSEC: |
82981930 | 1193 | v.val = !!test_bit(SOCK_PASSSEC, &sock->flags); |
e71a4783 | 1194 | break; |
877ce7c1 | 1195 | |
e71a4783 SH |
1196 | case SO_PEERSEC: |
1197 | return security_socket_getpeersec_stream(sock, optval, optlen, len); | |
1da177e4 | 1198 | |
4a19ec58 LAT |
1199 | case SO_MARK: |
1200 | v.val = sk->sk_mark; | |
1201 | break; | |
1202 | ||
3b885787 | 1203 | case SO_RXQ_OVFL: |
1b23a5df | 1204 | v.val = sock_flag(sk, SOCK_RXQ_OVFL); |
3b885787 NH |
1205 | break; |
1206 | ||
6e3e939f | 1207 | case SO_WIFI_STATUS: |
1b23a5df | 1208 | v.val = sock_flag(sk, SOCK_WIFI_STATUS); |
6e3e939f JB |
1209 | break; |
1210 | ||
ef64a54f PE |
1211 | case SO_PEEK_OFF: |
1212 | if (!sock->ops->set_peek_off) | |
1213 | return -EOPNOTSUPP; | |
1214 | ||
1215 | v.val = sk->sk_peek_off; | |
1216 | break; | |
bc2f7996 | 1217 | case SO_NOFCS: |
1b23a5df | 1218 | v.val = sock_flag(sk, SOCK_NOFCS); |
bc2f7996 | 1219 | break; |
c91f6df2 | 1220 | |
f7b86bfe | 1221 | case SO_BINDTODEVICE: |
c91f6df2 BH |
1222 | return sock_getbindtodevice(sk, optval, optlen, len); |
1223 | ||
a8fc9277 PE |
1224 | case SO_GET_FILTER: |
1225 | len = sk_get_filter(sk, (struct sock_filter __user *)optval, len); | |
1226 | if (len < 0) | |
1227 | return len; | |
1228 | ||
1229 | goto lenout; | |
c91f6df2 | 1230 | |
d59577b6 VB |
1231 | case SO_LOCK_FILTER: |
1232 | v.val = sock_flag(sk, SOCK_FILTER_LOCKED); | |
1233 | break; | |
1234 | ||
ea02f941 MS |
1235 | case SO_BPF_EXTENSIONS: |
1236 | v.val = bpf_tell_extensions(); | |
1237 | break; | |
1238 | ||
7d4c04fc KJ |
1239 | case SO_SELECT_ERR_QUEUE: |
1240 | v.val = sock_flag(sk, SOCK_SELECT_ERR_QUEUE); | |
1241 | break; | |
1242 | ||
e0d1095a | 1243 | #ifdef CONFIG_NET_RX_BUSY_POLL |
64b0dc51 | 1244 | case SO_BUSY_POLL: |
dafcc438 ET |
1245 | v.val = sk->sk_ll_usec; |
1246 | break; | |
1247 | #endif | |
1248 | ||
62748f32 ED |
1249 | case SO_MAX_PACING_RATE: |
1250 | v.val = sk->sk_max_pacing_rate; | |
1251 | break; | |
1252 | ||
2c8c56e1 ED |
1253 | case SO_INCOMING_CPU: |
1254 | v.val = sk->sk_incoming_cpu; | |
1255 | break; | |
1256 | ||
e71a4783 | 1257 | default: |
443b5991 YH |
1258 | /* We implement the SO_SNDLOWAT etc to not be settable |
1259 | * (1003.1g 7). | |
1260 | */ | |
e71a4783 | 1261 | return -ENOPROTOOPT; |
1da177e4 | 1262 | } |
e71a4783 | 1263 | |
1da177e4 LT |
1264 | if (len > lv) |
1265 | len = lv; | |
1266 | if (copy_to_user(optval, &v, len)) | |
1267 | return -EFAULT; | |
1268 | lenout: | |
4ec93edb YH |
1269 | if (put_user(len, optlen)) |
1270 | return -EFAULT; | |
1271 | return 0; | |
1da177e4 LT |
1272 | } |
1273 | ||
a5b5bb9a IM |
1274 | /* |
1275 | * Initialize an sk_lock. | |
1276 | * | |
1277 | * (We also register the sk_lock with the lock validator.) | |
1278 | */ | |
b6f99a21 | 1279 | static inline void sock_lock_init(struct sock *sk) |
a5b5bb9a | 1280 | { |
ed07536e PZ |
1281 | sock_lock_init_class_and_name(sk, |
1282 | af_family_slock_key_strings[sk->sk_family], | |
1283 | af_family_slock_keys + sk->sk_family, | |
1284 | af_family_key_strings[sk->sk_family], | |
1285 | af_family_keys + sk->sk_family); | |
a5b5bb9a IM |
1286 | } |
1287 | ||
4dc6dc71 ED |
1288 | /* |
1289 | * Copy all fields from osk to nsk but nsk->sk_refcnt must not change yet, | |
1290 | * even temporarly, because of RCU lookups. sk_node should also be left as is. | |
68835aba | 1291 | * We must not copy fields between sk_dontcopy_begin and sk_dontcopy_end |
4dc6dc71 | 1292 | */ |
f1a6c4da PE |
1293 | static void sock_copy(struct sock *nsk, const struct sock *osk) |
1294 | { | |
1295 | #ifdef CONFIG_SECURITY_NETWORK | |
1296 | void *sptr = nsk->sk_security; | |
1297 | #endif | |
68835aba ED |
1298 | memcpy(nsk, osk, offsetof(struct sock, sk_dontcopy_begin)); |
1299 | ||
1300 | memcpy(&nsk->sk_dontcopy_end, &osk->sk_dontcopy_end, | |
1301 | osk->sk_prot->obj_size - offsetof(struct sock, sk_dontcopy_end)); | |
1302 | ||
f1a6c4da PE |
1303 | #ifdef CONFIG_SECURITY_NETWORK |
1304 | nsk->sk_security = sptr; | |
1305 | security_sk_clone(osk, nsk); | |
1306 | #endif | |
1307 | } | |
1308 | ||
fcbdf09d OP |
1309 | void sk_prot_clear_portaddr_nulls(struct sock *sk, int size) |
1310 | { | |
1311 | unsigned long nulls1, nulls2; | |
1312 | ||
1313 | nulls1 = offsetof(struct sock, __sk_common.skc_node.next); | |
1314 | nulls2 = offsetof(struct sock, __sk_common.skc_portaddr_node.next); | |
1315 | if (nulls1 > nulls2) | |
1316 | swap(nulls1, nulls2); | |
1317 | ||
1318 | if (nulls1 != 0) | |
1319 | memset((char *)sk, 0, nulls1); | |
1320 | memset((char *)sk + nulls1 + sizeof(void *), 0, | |
1321 | nulls2 - nulls1 - sizeof(void *)); | |
1322 | memset((char *)sk + nulls2 + sizeof(void *), 0, | |
1323 | size - nulls2 - sizeof(void *)); | |
1324 | } | |
1325 | EXPORT_SYMBOL(sk_prot_clear_portaddr_nulls); | |
1326 | ||
2e4afe7b PE |
1327 | static struct sock *sk_prot_alloc(struct proto *prot, gfp_t priority, |
1328 | int family) | |
c308c1b2 PE |
1329 | { |
1330 | struct sock *sk; | |
1331 | struct kmem_cache *slab; | |
1332 | ||
1333 | slab = prot->slab; | |
e912b114 ED |
1334 | if (slab != NULL) { |
1335 | sk = kmem_cache_alloc(slab, priority & ~__GFP_ZERO); | |
1336 | if (!sk) | |
1337 | return sk; | |
1338 | if (priority & __GFP_ZERO) { | |
fcbdf09d OP |
1339 | if (prot->clear_sk) |
1340 | prot->clear_sk(sk, prot->obj_size); | |
1341 | else | |
1342 | sk_prot_clear_nulls(sk, prot->obj_size); | |
e912b114 | 1343 | } |
fcbdf09d | 1344 | } else |
c308c1b2 PE |
1345 | sk = kmalloc(prot->obj_size, priority); |
1346 | ||
2e4afe7b | 1347 | if (sk != NULL) { |
a98b65a3 VN |
1348 | kmemcheck_annotate_bitfield(sk, flags); |
1349 | ||
2e4afe7b PE |
1350 | if (security_sk_alloc(sk, family, priority)) |
1351 | goto out_free; | |
1352 | ||
1353 | if (!try_module_get(prot->owner)) | |
1354 | goto out_free_sec; | |
e022f0b4 | 1355 | sk_tx_queue_clear(sk); |
bd1060a1 | 1356 | cgroup_sk_alloc(&sk->sk_cgrp_data); |
2e4afe7b PE |
1357 | } |
1358 | ||
c308c1b2 | 1359 | return sk; |
2e4afe7b PE |
1360 | |
1361 | out_free_sec: | |
1362 | security_sk_free(sk); | |
1363 | out_free: | |
1364 | if (slab != NULL) | |
1365 | kmem_cache_free(slab, sk); | |
1366 | else | |
1367 | kfree(sk); | |
1368 | return NULL; | |
c308c1b2 PE |
1369 | } |
1370 | ||
1371 | static void sk_prot_free(struct proto *prot, struct sock *sk) | |
1372 | { | |
1373 | struct kmem_cache *slab; | |
2e4afe7b | 1374 | struct module *owner; |
c308c1b2 | 1375 | |
2e4afe7b | 1376 | owner = prot->owner; |
c308c1b2 | 1377 | slab = prot->slab; |
2e4afe7b | 1378 | |
bd1060a1 | 1379 | cgroup_sk_free(&sk->sk_cgrp_data); |
2e4afe7b | 1380 | security_sk_free(sk); |
c308c1b2 PE |
1381 | if (slab != NULL) |
1382 | kmem_cache_free(slab, sk); | |
1383 | else | |
1384 | kfree(sk); | |
2e4afe7b | 1385 | module_put(owner); |
c308c1b2 PE |
1386 | } |
1387 | ||
1da177e4 LT |
1388 | /** |
1389 | * sk_alloc - All socket objects are allocated here | |
c4ea43c5 | 1390 | * @net: the applicable net namespace |
4dc3b16b PP |
1391 | * @family: protocol family |
1392 | * @priority: for allocation (%GFP_KERNEL, %GFP_ATOMIC, etc) | |
1393 | * @prot: struct proto associated with this new sock instance | |
11aa9c28 | 1394 | * @kern: is this to be a kernel socket? |
1da177e4 | 1395 | */ |
1b8d7ae4 | 1396 | struct sock *sk_alloc(struct net *net, int family, gfp_t priority, |
11aa9c28 | 1397 | struct proto *prot, int kern) |
1da177e4 | 1398 | { |
c308c1b2 | 1399 | struct sock *sk; |
1da177e4 | 1400 | |
154adbc8 | 1401 | sk = sk_prot_alloc(prot, priority | __GFP_ZERO, family); |
1da177e4 | 1402 | if (sk) { |
154adbc8 PE |
1403 | sk->sk_family = family; |
1404 | /* | |
1405 | * See comment in struct sock definition to understand | |
1406 | * why we need sk_prot_creator -acme | |
1407 | */ | |
1408 | sk->sk_prot = sk->sk_prot_creator = prot; | |
1409 | sock_lock_init(sk); | |
26abe143 EB |
1410 | sk->sk_net_refcnt = kern ? 0 : 1; |
1411 | if (likely(sk->sk_net_refcnt)) | |
1412 | get_net(net); | |
1413 | sock_net_set(sk, net); | |
d66ee058 | 1414 | atomic_set(&sk->sk_wmem_alloc, 1); |
f8451725 | 1415 | |
2a56a1fe TH |
1416 | sock_update_classid(&sk->sk_cgrp_data); |
1417 | sock_update_netprioidx(&sk->sk_cgrp_data); | |
1da177e4 | 1418 | } |
a79af59e | 1419 | |
2e4afe7b | 1420 | return sk; |
1da177e4 | 1421 | } |
2a91525c | 1422 | EXPORT_SYMBOL(sk_alloc); |
1da177e4 | 1423 | |
eb4cb008 | 1424 | void sk_destruct(struct sock *sk) |
1da177e4 LT |
1425 | { |
1426 | struct sk_filter *filter; | |
1da177e4 LT |
1427 | |
1428 | if (sk->sk_destruct) | |
1429 | sk->sk_destruct(sk); | |
1430 | ||
a898def2 PM |
1431 | filter = rcu_dereference_check(sk->sk_filter, |
1432 | atomic_read(&sk->sk_wmem_alloc) == 0); | |
1da177e4 | 1433 | if (filter) { |
309dd5fc | 1434 | sk_filter_uncharge(sk, filter); |
a9b3cd7f | 1435 | RCU_INIT_POINTER(sk->sk_filter, NULL); |
1da177e4 | 1436 | } |
538950a1 CG |
1437 | if (rcu_access_pointer(sk->sk_reuseport_cb)) |
1438 | reuseport_detach_sock(sk); | |
1da177e4 | 1439 | |
08e29af3 | 1440 | sock_disable_timestamp(sk, SK_FLAGS_TIMESTAMP); |
1da177e4 LT |
1441 | |
1442 | if (atomic_read(&sk->sk_omem_alloc)) | |
e005d193 JP |
1443 | pr_debug("%s: optmem leakage (%d bytes) detected\n", |
1444 | __func__, atomic_read(&sk->sk_omem_alloc)); | |
1da177e4 | 1445 | |
109f6e39 EB |
1446 | if (sk->sk_peer_cred) |
1447 | put_cred(sk->sk_peer_cred); | |
1448 | put_pid(sk->sk_peer_pid); | |
26abe143 EB |
1449 | if (likely(sk->sk_net_refcnt)) |
1450 | put_net(sock_net(sk)); | |
c308c1b2 | 1451 | sk_prot_free(sk->sk_prot_creator, sk); |
1da177e4 | 1452 | } |
2b85a34e | 1453 | |
eb4cb008 CG |
1454 | static void __sk_free(struct sock *sk) |
1455 | { | |
b922622e | 1456 | if (unlikely(sock_diag_has_destroy_listeners(sk) && sk->sk_net_refcnt)) |
eb4cb008 CG |
1457 | sock_diag_broadcast_destroy(sk); |
1458 | else | |
1459 | sk_destruct(sk); | |
1460 | } | |
1461 | ||
2b85a34e ED |
1462 | void sk_free(struct sock *sk) |
1463 | { | |
1464 | /* | |
25985edc | 1465 | * We subtract one from sk_wmem_alloc and can know if |
2b85a34e ED |
1466 | * some packets are still in some tx queue. |
1467 | * If not null, sock_wfree() will call __sk_free(sk) later | |
1468 | */ | |
1469 | if (atomic_dec_and_test(&sk->sk_wmem_alloc)) | |
1470 | __sk_free(sk); | |
1471 | } | |
2a91525c | 1472 | EXPORT_SYMBOL(sk_free); |
1da177e4 | 1473 | |
e56c57d0 ED |
1474 | /** |
1475 | * sk_clone_lock - clone a socket, and lock its clone | |
1476 | * @sk: the socket to clone | |
1477 | * @priority: for allocation (%GFP_KERNEL, %GFP_ATOMIC, etc) | |
1478 | * | |
1479 | * Caller must unlock socket even in error path (bh_unlock_sock(newsk)) | |
1480 | */ | |
1481 | struct sock *sk_clone_lock(const struct sock *sk, const gfp_t priority) | |
87d11ceb | 1482 | { |
8fd1d178 | 1483 | struct sock *newsk; |
278571ba | 1484 | bool is_charged = true; |
87d11ceb | 1485 | |
8fd1d178 | 1486 | newsk = sk_prot_alloc(sk->sk_prot, priority, sk->sk_family); |
87d11ceb ACM |
1487 | if (newsk != NULL) { |
1488 | struct sk_filter *filter; | |
1489 | ||
892c141e | 1490 | sock_copy(newsk, sk); |
87d11ceb ACM |
1491 | |
1492 | /* SANITY */ | |
8a681736 SV |
1493 | if (likely(newsk->sk_net_refcnt)) |
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 | ||
87d11ceb | 1510 | rwlock_init(&newsk->sk_callback_lock); |
443aef0e PZ |
1511 | lockdep_set_class_and_name(&newsk->sk_callback_lock, |
1512 | af_callback_keys + newsk->sk_family, | |
1513 | af_family_clock_key_strings[newsk->sk_family]); | |
87d11ceb ACM |
1514 | |
1515 | newsk->sk_dst_cache = NULL; | |
1516 | newsk->sk_wmem_queued = 0; | |
1517 | newsk->sk_forward_alloc = 0; | |
1518 | newsk->sk_send_head = NULL; | |
87d11ceb ACM |
1519 | newsk->sk_userlocks = sk->sk_userlocks & ~SOCK_BINDPORT_LOCK; |
1520 | ||
1521 | sock_reset_flag(newsk, SOCK_DONE); | |
1522 | skb_queue_head_init(&newsk->sk_error_queue); | |
1523 | ||
0d7da9dd | 1524 | filter = rcu_dereference_protected(newsk->sk_filter, 1); |
87d11ceb | 1525 | if (filter != NULL) |
278571ba AS |
1526 | /* though it's an empty new sock, the charging may fail |
1527 | * if sysctl_optmem_max was changed between creation of | |
1528 | * original socket and cloning | |
1529 | */ | |
1530 | is_charged = sk_filter_charge(newsk, filter); | |
87d11ceb | 1531 | |
d188ba86 | 1532 | if (unlikely(!is_charged || xfrm_sk_clone_policy(newsk, sk))) { |
87d11ceb ACM |
1533 | /* It is still raw copy of parent, so invalidate |
1534 | * destructor and make plain sk_free() */ | |
1535 | newsk->sk_destruct = NULL; | |
b0691c8e | 1536 | bh_unlock_sock(newsk); |
87d11ceb ACM |
1537 | sk_free(newsk); |
1538 | newsk = NULL; | |
1539 | goto out; | |
1540 | } | |
fa463497 | 1541 | RCU_INIT_POINTER(newsk->sk_reuseport_cb, NULL); |
87d11ceb ACM |
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 | |
baac50bb | 1569 | if (mem_cgroup_sockets_enabled && sk->sk_memcg) |
3d596f7b | 1570 | sock_update_memcg(newsk); |
f3f511e1 | 1571 | |
87d11ceb | 1572 | if (newsk->sk_prot->sockets_allocated) |
180d8cd9 | 1573 | sk_sockets_allocated_inc(newsk); |
704da560 | 1574 | |
080a270f HFS |
1575 | if (sock_needs_netstamp(sk) && |
1576 | newsk->sk_flags & SK_FLAGS_TIMESTAMP) | |
704da560 | 1577 | net_enable_timestamp(); |
87d11ceb ACM |
1578 | } |
1579 | out: | |
1580 | return newsk; | |
1581 | } | |
e56c57d0 | 1582 | EXPORT_SYMBOL_GPL(sk_clone_lock); |
87d11ceb | 1583 | |
9958089a AK |
1584 | void sk_setup_caps(struct sock *sk, struct dst_entry *dst) |
1585 | { | |
d6a4e26a ED |
1586 | u32 max_segs = 1; |
1587 | ||
6bd4f355 | 1588 | sk_dst_set(sk, dst); |
9958089a AK |
1589 | sk->sk_route_caps = dst->dev->features; |
1590 | if (sk->sk_route_caps & NETIF_F_GSO) | |
4fcd6b99 | 1591 | sk->sk_route_caps |= NETIF_F_GSO_SOFTWARE; |
a465419b | 1592 | sk->sk_route_caps &= ~sk->sk_route_nocaps; |
9958089a | 1593 | if (sk_can_gso(sk)) { |
82cc1a7a | 1594 | if (dst->header_len) { |
9958089a | 1595 | sk->sk_route_caps &= ~NETIF_F_GSO_MASK; |
82cc1a7a | 1596 | } else { |
9958089a | 1597 | sk->sk_route_caps |= NETIF_F_SG | NETIF_F_HW_CSUM; |
82cc1a7a | 1598 | sk->sk_gso_max_size = dst->dev->gso_max_size; |
d6a4e26a | 1599 | max_segs = max_t(u32, dst->dev->gso_max_segs, 1); |
82cc1a7a | 1600 | } |
9958089a | 1601 | } |
d6a4e26a | 1602 | sk->sk_gso_max_segs = max_segs; |
9958089a AK |
1603 | } |
1604 | EXPORT_SYMBOL_GPL(sk_setup_caps); | |
1605 | ||
1da177e4 LT |
1606 | /* |
1607 | * Simple resource managers for sockets. | |
1608 | */ | |
1609 | ||
1610 | ||
4ec93edb YH |
1611 | /* |
1612 | * Write buffer destructor automatically called from kfree_skb. | |
1da177e4 LT |
1613 | */ |
1614 | void sock_wfree(struct sk_buff *skb) | |
1615 | { | |
1616 | struct sock *sk = skb->sk; | |
d99927f4 | 1617 | unsigned int len = skb->truesize; |
1da177e4 | 1618 | |
d99927f4 ED |
1619 | if (!sock_flag(sk, SOCK_USE_WRITE_QUEUE)) { |
1620 | /* | |
1621 | * Keep a reference on sk_wmem_alloc, this will be released | |
1622 | * after sk_write_space() call | |
1623 | */ | |
1624 | atomic_sub(len - 1, &sk->sk_wmem_alloc); | |
1da177e4 | 1625 | sk->sk_write_space(sk); |
d99927f4 ED |
1626 | len = 1; |
1627 | } | |
2b85a34e | 1628 | /* |
d99927f4 ED |
1629 | * if sk_wmem_alloc reaches 0, we must finish what sk_free() |
1630 | * could not do because of in-flight packets | |
2b85a34e | 1631 | */ |
d99927f4 | 1632 | if (atomic_sub_and_test(len, &sk->sk_wmem_alloc)) |
2b85a34e | 1633 | __sk_free(sk); |
1da177e4 | 1634 | } |
2a91525c | 1635 | EXPORT_SYMBOL(sock_wfree); |
1da177e4 | 1636 | |
9e17f8a4 ED |
1637 | void skb_set_owner_w(struct sk_buff *skb, struct sock *sk) |
1638 | { | |
1639 | skb_orphan(skb); | |
1640 | skb->sk = sk; | |
1641 | #ifdef CONFIG_INET | |
1642 | if (unlikely(!sk_fullsock(sk))) { | |
1643 | skb->destructor = sock_edemux; | |
1644 | sock_hold(sk); | |
1645 | return; | |
1646 | } | |
1647 | #endif | |
1648 | skb->destructor = sock_wfree; | |
1649 | skb_set_hash_from_sk(skb, sk); | |
1650 | /* | |
1651 | * We used to take a refcount on sk, but following operation | |
1652 | * is enough to guarantee sk_free() wont free this sock until | |
1653 | * all in-flight packets are completed | |
1654 | */ | |
1655 | atomic_add(skb->truesize, &sk->sk_wmem_alloc); | |
1656 | } | |
1657 | EXPORT_SYMBOL(skb_set_owner_w); | |
1658 | ||
f2f872f9 ED |
1659 | void skb_orphan_partial(struct sk_buff *skb) |
1660 | { | |
1661 | /* TCP stack sets skb->ooo_okay based on sk_wmem_alloc, | |
1662 | * so we do not completely orphan skb, but transfert all | |
1663 | * accounted bytes but one, to avoid unexpected reorders. | |
1664 | */ | |
1665 | if (skb->destructor == sock_wfree | |
1666 | #ifdef CONFIG_INET | |
1667 | || skb->destructor == tcp_wfree | |
1668 | #endif | |
1669 | ) { | |
1670 | atomic_sub(skb->truesize - 1, &skb->sk->sk_wmem_alloc); | |
1671 | skb->truesize = 1; | |
1672 | } else { | |
1673 | skb_orphan(skb); | |
1674 | } | |
1675 | } | |
1676 | EXPORT_SYMBOL(skb_orphan_partial); | |
1677 | ||
4ec93edb YH |
1678 | /* |
1679 | * Read buffer destructor automatically called from kfree_skb. | |
1da177e4 LT |
1680 | */ |
1681 | void sock_rfree(struct sk_buff *skb) | |
1682 | { | |
1683 | struct sock *sk = skb->sk; | |
d361fd59 | 1684 | unsigned int len = skb->truesize; |
1da177e4 | 1685 | |
d361fd59 ED |
1686 | atomic_sub(len, &sk->sk_rmem_alloc); |
1687 | sk_mem_uncharge(sk, len); | |
1da177e4 | 1688 | } |
2a91525c | 1689 | EXPORT_SYMBOL(sock_rfree); |
1da177e4 | 1690 | |
7768eed8 OH |
1691 | /* |
1692 | * Buffer destructor for skbs that are not used directly in read or write | |
1693 | * path, e.g. for error handler skbs. Automatically called from kfree_skb. | |
1694 | */ | |
62bccb8c AD |
1695 | void sock_efree(struct sk_buff *skb) |
1696 | { | |
1697 | sock_put(skb->sk); | |
1698 | } | |
1699 | EXPORT_SYMBOL(sock_efree); | |
1700 | ||
976d0201 | 1701 | kuid_t sock_i_uid(struct sock *sk) |
1da177e4 | 1702 | { |
976d0201 | 1703 | kuid_t uid; |
1da177e4 | 1704 | |
f064af1e | 1705 | read_lock_bh(&sk->sk_callback_lock); |
976d0201 | 1706 | uid = sk->sk_socket ? SOCK_INODE(sk->sk_socket)->i_uid : GLOBAL_ROOT_UID; |
f064af1e | 1707 | read_unlock_bh(&sk->sk_callback_lock); |
1da177e4 LT |
1708 | return uid; |
1709 | } | |
2a91525c | 1710 | EXPORT_SYMBOL(sock_i_uid); |
1da177e4 LT |
1711 | |
1712 | unsigned long sock_i_ino(struct sock *sk) | |
1713 | { | |
1714 | unsigned long ino; | |
1715 | ||
f064af1e | 1716 | read_lock_bh(&sk->sk_callback_lock); |
1da177e4 | 1717 | ino = sk->sk_socket ? SOCK_INODE(sk->sk_socket)->i_ino : 0; |
f064af1e | 1718 | read_unlock_bh(&sk->sk_callback_lock); |
1da177e4 LT |
1719 | return ino; |
1720 | } | |
2a91525c | 1721 | EXPORT_SYMBOL(sock_i_ino); |
1da177e4 LT |
1722 | |
1723 | /* | |
1724 | * Allocate a skb from the socket's send buffer. | |
1725 | */ | |
86a76caf | 1726 | struct sk_buff *sock_wmalloc(struct sock *sk, unsigned long size, int force, |
dd0fc66f | 1727 | gfp_t priority) |
1da177e4 LT |
1728 | { |
1729 | if (force || atomic_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf) { | |
2a91525c | 1730 | struct sk_buff *skb = alloc_skb(size, priority); |
1da177e4 LT |
1731 | if (skb) { |
1732 | skb_set_owner_w(skb, sk); | |
1733 | return skb; | |
1734 | } | |
1735 | } | |
1736 | return NULL; | |
1737 | } | |
2a91525c | 1738 | EXPORT_SYMBOL(sock_wmalloc); |
1da177e4 | 1739 | |
4ec93edb | 1740 | /* |
1da177e4 | 1741 | * Allocate a memory block from the socket's option memory buffer. |
4ec93edb | 1742 | */ |
dd0fc66f | 1743 | void *sock_kmalloc(struct sock *sk, int size, gfp_t priority) |
1da177e4 | 1744 | { |
95c96174 | 1745 | if ((unsigned int)size <= sysctl_optmem_max && |
1da177e4 LT |
1746 | atomic_read(&sk->sk_omem_alloc) + size < sysctl_optmem_max) { |
1747 | void *mem; | |
1748 | /* First do the add, to avoid the race if kmalloc | |
4ec93edb | 1749 | * might sleep. |
1da177e4 LT |
1750 | */ |
1751 | atomic_add(size, &sk->sk_omem_alloc); | |
1752 | mem = kmalloc(size, priority); | |
1753 | if (mem) | |
1754 | return mem; | |
1755 | atomic_sub(size, &sk->sk_omem_alloc); | |
1756 | } | |
1757 | return NULL; | |
1758 | } | |
2a91525c | 1759 | EXPORT_SYMBOL(sock_kmalloc); |
1da177e4 | 1760 | |
79e88659 DB |
1761 | /* Free an option memory block. Note, we actually want the inline |
1762 | * here as this allows gcc to detect the nullify and fold away the | |
1763 | * condition entirely. | |
1da177e4 | 1764 | */ |
79e88659 DB |
1765 | static inline void __sock_kfree_s(struct sock *sk, void *mem, int size, |
1766 | const bool nullify) | |
1da177e4 | 1767 | { |
e53da5fb DM |
1768 | if (WARN_ON_ONCE(!mem)) |
1769 | return; | |
79e88659 DB |
1770 | if (nullify) |
1771 | kzfree(mem); | |
1772 | else | |
1773 | kfree(mem); | |
1da177e4 LT |
1774 | atomic_sub(size, &sk->sk_omem_alloc); |
1775 | } | |
79e88659 DB |
1776 | |
1777 | void sock_kfree_s(struct sock *sk, void *mem, int size) | |
1778 | { | |
1779 | __sock_kfree_s(sk, mem, size, false); | |
1780 | } | |
2a91525c | 1781 | EXPORT_SYMBOL(sock_kfree_s); |
1da177e4 | 1782 | |
79e88659 DB |
1783 | void sock_kzfree_s(struct sock *sk, void *mem, int size) |
1784 | { | |
1785 | __sock_kfree_s(sk, mem, size, true); | |
1786 | } | |
1787 | EXPORT_SYMBOL(sock_kzfree_s); | |
1788 | ||
1da177e4 LT |
1789 | /* It is almost wait_for_tcp_memory minus release_sock/lock_sock. |
1790 | I think, these locks should be removed for datagram sockets. | |
1791 | */ | |
2a91525c | 1792 | static long sock_wait_for_wmem(struct sock *sk, long timeo) |
1da177e4 LT |
1793 | { |
1794 | DEFINE_WAIT(wait); | |
1795 | ||
9cd3e072 | 1796 | sk_clear_bit(SOCKWQ_ASYNC_NOSPACE, sk); |
1da177e4 LT |
1797 | for (;;) { |
1798 | if (!timeo) | |
1799 | break; | |
1800 | if (signal_pending(current)) | |
1801 | break; | |
1802 | set_bit(SOCK_NOSPACE, &sk->sk_socket->flags); | |
aa395145 | 1803 | prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE); |
1da177e4 LT |
1804 | if (atomic_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf) |
1805 | break; | |
1806 | if (sk->sk_shutdown & SEND_SHUTDOWN) | |
1807 | break; | |
1808 | if (sk->sk_err) | |
1809 | break; | |
1810 | timeo = schedule_timeout(timeo); | |
1811 | } | |
aa395145 | 1812 | finish_wait(sk_sleep(sk), &wait); |
1da177e4 LT |
1813 | return timeo; |
1814 | } | |
1815 | ||
1816 | ||
1817 | /* | |
1818 | * Generic send/receive buffer handlers | |
1819 | */ | |
1820 | ||
4cc7f68d HX |
1821 | struct sk_buff *sock_alloc_send_pskb(struct sock *sk, unsigned long header_len, |
1822 | unsigned long data_len, int noblock, | |
28d64271 | 1823 | int *errcode, int max_page_order) |
1da177e4 | 1824 | { |
2e4e4410 | 1825 | struct sk_buff *skb; |
1da177e4 LT |
1826 | long timeo; |
1827 | int err; | |
1828 | ||
1da177e4 | 1829 | timeo = sock_sndtimeo(sk, noblock); |
2e4e4410 | 1830 | for (;;) { |
1da177e4 LT |
1831 | err = sock_error(sk); |
1832 | if (err != 0) | |
1833 | goto failure; | |
1834 | ||
1835 | err = -EPIPE; | |
1836 | if (sk->sk_shutdown & SEND_SHUTDOWN) | |
1837 | goto failure; | |
1838 | ||
2e4e4410 ED |
1839 | if (sk_wmem_alloc_get(sk) < sk->sk_sndbuf) |
1840 | break; | |
28d64271 | 1841 | |
9cd3e072 | 1842 | sk_set_bit(SOCKWQ_ASYNC_NOSPACE, sk); |
2e4e4410 ED |
1843 | set_bit(SOCK_NOSPACE, &sk->sk_socket->flags); |
1844 | err = -EAGAIN; | |
1845 | if (!timeo) | |
1da177e4 | 1846 | goto failure; |
2e4e4410 ED |
1847 | if (signal_pending(current)) |
1848 | goto interrupted; | |
1849 | timeo = sock_wait_for_wmem(sk, timeo); | |
1da177e4 | 1850 | } |
2e4e4410 ED |
1851 | skb = alloc_skb_with_frags(header_len, data_len, max_page_order, |
1852 | errcode, sk->sk_allocation); | |
1853 | if (skb) | |
1854 | skb_set_owner_w(skb, sk); | |
1da177e4 LT |
1855 | return skb; |
1856 | ||
1857 | interrupted: | |
1858 | err = sock_intr_errno(timeo); | |
1859 | failure: | |
1860 | *errcode = err; | |
1861 | return NULL; | |
1862 | } | |
4cc7f68d | 1863 | EXPORT_SYMBOL(sock_alloc_send_pskb); |
1da177e4 | 1864 | |
4ec93edb | 1865 | struct sk_buff *sock_alloc_send_skb(struct sock *sk, unsigned long size, |
1da177e4 LT |
1866 | int noblock, int *errcode) |
1867 | { | |
28d64271 | 1868 | return sock_alloc_send_pskb(sk, size, 0, noblock, errcode, 0); |
1da177e4 | 1869 | } |
2a91525c | 1870 | EXPORT_SYMBOL(sock_alloc_send_skb); |
1da177e4 | 1871 | |
f28ea365 EJ |
1872 | int sock_cmsg_send(struct sock *sk, struct msghdr *msg, |
1873 | struct sockcm_cookie *sockc) | |
1874 | { | |
1875 | struct cmsghdr *cmsg; | |
1876 | ||
1877 | for_each_cmsghdr(cmsg, msg) { | |
1878 | if (!CMSG_OK(msg, cmsg)) | |
1879 | return -EINVAL; | |
1880 | if (cmsg->cmsg_level != SOL_SOCKET) | |
1881 | continue; | |
1882 | switch (cmsg->cmsg_type) { | |
1883 | case SO_MARK: | |
1884 | if (!ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN)) | |
1885 | return -EPERM; | |
1886 | if (cmsg->cmsg_len != CMSG_LEN(sizeof(u32))) | |
1887 | return -EINVAL; | |
1888 | sockc->mark = *(u32 *)CMSG_DATA(cmsg); | |
1889 | break; | |
1890 | default: | |
1891 | return -EINVAL; | |
1892 | } | |
1893 | } | |
1894 | return 0; | |
1895 | } | |
1896 | EXPORT_SYMBOL(sock_cmsg_send); | |
1897 | ||
5640f768 ED |
1898 | /* On 32bit arches, an skb frag is limited to 2^15 */ |
1899 | #define SKB_FRAG_PAGE_ORDER get_order(32768) | |
1900 | ||
400dfd3a ED |
1901 | /** |
1902 | * skb_page_frag_refill - check that a page_frag contains enough room | |
1903 | * @sz: minimum size of the fragment we want to get | |
1904 | * @pfrag: pointer to page_frag | |
82d5e2b8 | 1905 | * @gfp: priority for memory allocation |
400dfd3a ED |
1906 | * |
1907 | * Note: While this allocator tries to use high order pages, there is | |
1908 | * no guarantee that allocations succeed. Therefore, @sz MUST be | |
1909 | * less or equal than PAGE_SIZE. | |
1910 | */ | |
d9b2938a | 1911 | bool skb_page_frag_refill(unsigned int sz, struct page_frag *pfrag, gfp_t gfp) |
5640f768 | 1912 | { |
5640f768 | 1913 | if (pfrag->page) { |
fe896d18 | 1914 | if (page_ref_count(pfrag->page) == 1) { |
5640f768 ED |
1915 | pfrag->offset = 0; |
1916 | return true; | |
1917 | } | |
400dfd3a | 1918 | if (pfrag->offset + sz <= pfrag->size) |
5640f768 ED |
1919 | return true; |
1920 | put_page(pfrag->page); | |
1921 | } | |
1922 | ||
d9b2938a ED |
1923 | pfrag->offset = 0; |
1924 | if (SKB_FRAG_PAGE_ORDER) { | |
d0164adc MG |
1925 | /* Avoid direct reclaim but allow kswapd to wake */ |
1926 | pfrag->page = alloc_pages((gfp & ~__GFP_DIRECT_RECLAIM) | | |
1927 | __GFP_COMP | __GFP_NOWARN | | |
1928 | __GFP_NORETRY, | |
d9b2938a | 1929 | SKB_FRAG_PAGE_ORDER); |
5640f768 | 1930 | if (likely(pfrag->page)) { |
d9b2938a | 1931 | pfrag->size = PAGE_SIZE << SKB_FRAG_PAGE_ORDER; |
5640f768 ED |
1932 | return true; |
1933 | } | |
d9b2938a ED |
1934 | } |
1935 | pfrag->page = alloc_page(gfp); | |
1936 | if (likely(pfrag->page)) { | |
1937 | pfrag->size = PAGE_SIZE; | |
1938 | return true; | |
1939 | } | |
400dfd3a ED |
1940 | return false; |
1941 | } | |
1942 | EXPORT_SYMBOL(skb_page_frag_refill); | |
1943 | ||
1944 | bool sk_page_frag_refill(struct sock *sk, struct page_frag *pfrag) | |
1945 | { | |
1946 | if (likely(skb_page_frag_refill(32U, pfrag, sk->sk_allocation))) | |
1947 | return true; | |
1948 | ||
5640f768 ED |
1949 | sk_enter_memory_pressure(sk); |
1950 | sk_stream_moderate_sndbuf(sk); | |
1951 | return false; | |
1952 | } | |
1953 | EXPORT_SYMBOL(sk_page_frag_refill); | |
1954 | ||
1da177e4 | 1955 | static void __lock_sock(struct sock *sk) |
f39234d6 NK |
1956 | __releases(&sk->sk_lock.slock) |
1957 | __acquires(&sk->sk_lock.slock) | |
1da177e4 LT |
1958 | { |
1959 | DEFINE_WAIT(wait); | |
1960 | ||
e71a4783 | 1961 | for (;;) { |
1da177e4 LT |
1962 | prepare_to_wait_exclusive(&sk->sk_lock.wq, &wait, |
1963 | TASK_UNINTERRUPTIBLE); | |
1964 | spin_unlock_bh(&sk->sk_lock.slock); | |
1965 | schedule(); | |
1966 | spin_lock_bh(&sk->sk_lock.slock); | |
e71a4783 | 1967 | if (!sock_owned_by_user(sk)) |
1da177e4 LT |
1968 | break; |
1969 | } | |
1970 | finish_wait(&sk->sk_lock.wq, &wait); | |
1971 | } | |
1972 | ||
1973 | static void __release_sock(struct sock *sk) | |
f39234d6 NK |
1974 | __releases(&sk->sk_lock.slock) |
1975 | __acquires(&sk->sk_lock.slock) | |
1da177e4 LT |
1976 | { |
1977 | struct sk_buff *skb = sk->sk_backlog.head; | |
1978 | ||
1979 | do { | |
1980 | sk->sk_backlog.head = sk->sk_backlog.tail = NULL; | |
1981 | bh_unlock_sock(sk); | |
1982 | ||
1983 | do { | |
1984 | struct sk_buff *next = skb->next; | |
1985 | ||
e4cbb02a | 1986 | prefetch(next); |
7fee226a | 1987 | WARN_ON_ONCE(skb_dst_is_noref(skb)); |
1da177e4 | 1988 | skb->next = NULL; |
c57943a1 | 1989 | sk_backlog_rcv(sk, skb); |
1da177e4 LT |
1990 | |
1991 | /* | |
1992 | * We are in process context here with softirqs | |
1993 | * disabled, use cond_resched_softirq() to preempt. | |
1994 | * This is safe to do because we've taken the backlog | |
1995 | * queue private: | |
1996 | */ | |
1997 | cond_resched_softirq(); | |
1998 | ||
1999 | skb = next; | |
2000 | } while (skb != NULL); | |
2001 | ||
2002 | bh_lock_sock(sk); | |
e71a4783 | 2003 | } while ((skb = sk->sk_backlog.head) != NULL); |
8eae939f ZY |
2004 | |
2005 | /* | |
2006 | * Doing the zeroing here guarantee we can not loop forever | |
2007 | * while a wild producer attempts to flood us. | |
2008 | */ | |
2009 | sk->sk_backlog.len = 0; | |
1da177e4 LT |
2010 | } |
2011 | ||
2012 | /** | |
2013 | * sk_wait_data - wait for data to arrive at sk_receive_queue | |
4dc3b16b PP |
2014 | * @sk: sock to wait on |
2015 | * @timeo: for how long | |
dfbafc99 | 2016 | * @skb: last skb seen on sk_receive_queue |
1da177e4 LT |
2017 | * |
2018 | * Now socket state including sk->sk_err is changed only under lock, | |
2019 | * hence we may omit checks after joining wait queue. | |
2020 | * We check receive queue before schedule() only as optimization; | |
2021 | * it is very likely that release_sock() added new data. | |
2022 | */ | |
dfbafc99 | 2023 | int sk_wait_data(struct sock *sk, long *timeo, const struct sk_buff *skb) |
1da177e4 LT |
2024 | { |
2025 | int rc; | |
2026 | DEFINE_WAIT(wait); | |
2027 | ||
aa395145 | 2028 | prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE); |
9cd3e072 | 2029 | sk_set_bit(SOCKWQ_ASYNC_WAITDATA, sk); |
dfbafc99 | 2030 | rc = sk_wait_event(sk, timeo, skb_peek_tail(&sk->sk_receive_queue) != skb); |
9cd3e072 | 2031 | sk_clear_bit(SOCKWQ_ASYNC_WAITDATA, sk); |
aa395145 | 2032 | finish_wait(sk_sleep(sk), &wait); |
1da177e4 LT |
2033 | return rc; |
2034 | } | |
1da177e4 LT |
2035 | EXPORT_SYMBOL(sk_wait_data); |
2036 | ||
3ab224be HA |
2037 | /** |
2038 | * __sk_mem_schedule - increase sk_forward_alloc and memory_allocated | |
2039 | * @sk: socket | |
2040 | * @size: memory size to allocate | |
2041 | * @kind: allocation type | |
2042 | * | |
2043 | * If kind is SK_MEM_SEND, it means wmem allocation. Otherwise it means | |
2044 | * rmem allocation. This function assumes that protocols which have | |
2045 | * memory_pressure use sk_wmem_queued as write buffer accounting. | |
2046 | */ | |
2047 | int __sk_mem_schedule(struct sock *sk, int size, int kind) | |
2048 | { | |
2049 | struct proto *prot = sk->sk_prot; | |
2050 | int amt = sk_mem_pages(size); | |
8d987e5c | 2051 | long allocated; |
3ab224be HA |
2052 | |
2053 | sk->sk_forward_alloc += amt * SK_MEM_QUANTUM; | |
180d8cd9 | 2054 | |
e805605c JW |
2055 | allocated = sk_memory_allocated_add(sk, amt); |
2056 | ||
baac50bb JW |
2057 | if (mem_cgroup_sockets_enabled && sk->sk_memcg && |
2058 | !mem_cgroup_charge_skmem(sk->sk_memcg, amt)) | |
e805605c | 2059 | goto suppress_allocation; |
3ab224be HA |
2060 | |
2061 | /* Under limit. */ | |
e805605c | 2062 | if (allocated <= sk_prot_mem_limits(sk, 0)) { |
180d8cd9 | 2063 | sk_leave_memory_pressure(sk); |
3ab224be HA |
2064 | return 1; |
2065 | } | |
2066 | ||
e805605c JW |
2067 | /* Under pressure. */ |
2068 | if (allocated > sk_prot_mem_limits(sk, 1)) | |
180d8cd9 | 2069 | sk_enter_memory_pressure(sk); |
3ab224be | 2070 | |
e805605c JW |
2071 | /* Over hard limit. */ |
2072 | if (allocated > sk_prot_mem_limits(sk, 2)) | |
3ab224be HA |
2073 | goto suppress_allocation; |
2074 | ||
2075 | /* guarantee minimum buffer size under pressure */ | |
2076 | if (kind == SK_MEM_RECV) { | |
2077 | if (atomic_read(&sk->sk_rmem_alloc) < prot->sysctl_rmem[0]) | |
2078 | return 1; | |
180d8cd9 | 2079 | |
3ab224be HA |
2080 | } else { /* SK_MEM_SEND */ |
2081 | if (sk->sk_type == SOCK_STREAM) { | |
2082 | if (sk->sk_wmem_queued < prot->sysctl_wmem[0]) | |
2083 | return 1; | |
2084 | } else if (atomic_read(&sk->sk_wmem_alloc) < | |
2085 | prot->sysctl_wmem[0]) | |
2086 | return 1; | |
2087 | } | |
2088 | ||
180d8cd9 | 2089 | if (sk_has_memory_pressure(sk)) { |
1748376b ED |
2090 | int alloc; |
2091 | ||
180d8cd9 | 2092 | if (!sk_under_memory_pressure(sk)) |
1748376b | 2093 | return 1; |
180d8cd9 GC |
2094 | alloc = sk_sockets_allocated_read_positive(sk); |
2095 | if (sk_prot_mem_limits(sk, 2) > alloc * | |
3ab224be HA |
2096 | sk_mem_pages(sk->sk_wmem_queued + |
2097 | atomic_read(&sk->sk_rmem_alloc) + | |
2098 | sk->sk_forward_alloc)) | |
2099 | return 1; | |
2100 | } | |
2101 | ||
2102 | suppress_allocation: | |
2103 | ||
2104 | if (kind == SK_MEM_SEND && sk->sk_type == SOCK_STREAM) { | |
2105 | sk_stream_moderate_sndbuf(sk); | |
2106 | ||
2107 | /* Fail only if socket is _under_ its sndbuf. | |
2108 | * In this case we cannot block, so that we have to fail. | |
2109 | */ | |
2110 | if (sk->sk_wmem_queued + size >= sk->sk_sndbuf) | |
2111 | return 1; | |
2112 | } | |
2113 | ||
3847ce32 SM |
2114 | trace_sock_exceed_buf_limit(sk, prot, allocated); |
2115 | ||
3ab224be HA |
2116 | /* Alas. Undo changes. */ |
2117 | sk->sk_forward_alloc -= amt * SK_MEM_QUANTUM; | |
180d8cd9 | 2118 | |
0e90b31f | 2119 | sk_memory_allocated_sub(sk, amt); |
180d8cd9 | 2120 | |
baac50bb JW |
2121 | if (mem_cgroup_sockets_enabled && sk->sk_memcg) |
2122 | mem_cgroup_uncharge_skmem(sk->sk_memcg, amt); | |
e805605c | 2123 | |
3ab224be HA |
2124 | return 0; |
2125 | } | |
3ab224be HA |
2126 | EXPORT_SYMBOL(__sk_mem_schedule); |
2127 | ||
2128 | /** | |
69dba9bb | 2129 | * __sk_mem_reclaim - reclaim memory_allocated |
3ab224be | 2130 | * @sk: socket |
1a24e04e | 2131 | * @amount: number of bytes (rounded down to a SK_MEM_QUANTUM multiple) |
3ab224be | 2132 | */ |
1a24e04e | 2133 | void __sk_mem_reclaim(struct sock *sk, int amount) |
3ab224be | 2134 | { |
1a24e04e ED |
2135 | amount >>= SK_MEM_QUANTUM_SHIFT; |
2136 | sk_memory_allocated_sub(sk, amount); | |
2137 | sk->sk_forward_alloc -= amount << SK_MEM_QUANTUM_SHIFT; | |
3ab224be | 2138 | |
baac50bb JW |
2139 | if (mem_cgroup_sockets_enabled && sk->sk_memcg) |
2140 | mem_cgroup_uncharge_skmem(sk->sk_memcg, amount); | |
e805605c | 2141 | |
180d8cd9 GC |
2142 | if (sk_under_memory_pressure(sk) && |
2143 | (sk_memory_allocated(sk) < sk_prot_mem_limits(sk, 0))) | |
2144 | sk_leave_memory_pressure(sk); | |
3ab224be | 2145 | } |
3ab224be HA |
2146 | EXPORT_SYMBOL(__sk_mem_reclaim); |
2147 | ||
2148 | ||
1da177e4 LT |
2149 | /* |
2150 | * Set of default routines for initialising struct proto_ops when | |
2151 | * the protocol does not support a particular function. In certain | |
2152 | * cases where it makes no sense for a protocol to have a "do nothing" | |
2153 | * function, some default processing is provided. | |
2154 | */ | |
2155 | ||
2156 | int sock_no_bind(struct socket *sock, struct sockaddr *saddr, int len) | |
2157 | { | |
2158 | return -EOPNOTSUPP; | |
2159 | } | |
2a91525c | 2160 | EXPORT_SYMBOL(sock_no_bind); |
1da177e4 | 2161 | |
4ec93edb | 2162 | int sock_no_connect(struct socket *sock, struct sockaddr *saddr, |
1da177e4 LT |
2163 | int len, int flags) |
2164 | { | |
2165 | return -EOPNOTSUPP; | |
2166 | } | |
2a91525c | 2167 | EXPORT_SYMBOL(sock_no_connect); |
1da177e4 LT |
2168 | |
2169 | int sock_no_socketpair(struct socket *sock1, struct socket *sock2) | |
2170 | { | |
2171 | return -EOPNOTSUPP; | |
2172 | } | |
2a91525c | 2173 | EXPORT_SYMBOL(sock_no_socketpair); |
1da177e4 LT |
2174 | |
2175 | int sock_no_accept(struct socket *sock, struct socket *newsock, int flags) | |
2176 | { | |
2177 | return -EOPNOTSUPP; | |
2178 | } | |
2a91525c | 2179 | EXPORT_SYMBOL(sock_no_accept); |
1da177e4 | 2180 | |
4ec93edb | 2181 | int sock_no_getname(struct socket *sock, struct sockaddr *saddr, |
1da177e4 LT |
2182 | int *len, int peer) |
2183 | { | |
2184 | return -EOPNOTSUPP; | |
2185 | } | |
2a91525c | 2186 | EXPORT_SYMBOL(sock_no_getname); |
1da177e4 | 2187 | |
2a91525c | 2188 | unsigned int sock_no_poll(struct file *file, struct socket *sock, poll_table *pt) |
1da177e4 LT |
2189 | { |
2190 | return 0; | |
2191 | } | |
2a91525c | 2192 | EXPORT_SYMBOL(sock_no_poll); |
1da177e4 LT |
2193 | |
2194 | int sock_no_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg) | |
2195 | { | |
2196 | return -EOPNOTSUPP; | |
2197 | } | |
2a91525c | 2198 | EXPORT_SYMBOL(sock_no_ioctl); |
1da177e4 LT |
2199 | |
2200 | int sock_no_listen(struct socket *sock, int backlog) | |
2201 | { | |
2202 | return -EOPNOTSUPP; | |
2203 | } | |
2a91525c | 2204 | EXPORT_SYMBOL(sock_no_listen); |
1da177e4 LT |
2205 | |
2206 | int sock_no_shutdown(struct socket *sock, int how) | |
2207 | { | |
2208 | return -EOPNOTSUPP; | |
2209 | } | |
2a91525c | 2210 | EXPORT_SYMBOL(sock_no_shutdown); |
1da177e4 LT |
2211 | |
2212 | int sock_no_setsockopt(struct socket *sock, int level, int optname, | |
b7058842 | 2213 | char __user *optval, unsigned int optlen) |
1da177e4 LT |
2214 | { |
2215 | return -EOPNOTSUPP; | |
2216 | } | |
2a91525c | 2217 | EXPORT_SYMBOL(sock_no_setsockopt); |
1da177e4 LT |
2218 | |
2219 | int sock_no_getsockopt(struct socket *sock, int level, int optname, | |
2220 | char __user *optval, int __user *optlen) | |
2221 | { | |
2222 | return -EOPNOTSUPP; | |
2223 | } | |
2a91525c | 2224 | EXPORT_SYMBOL(sock_no_getsockopt); |
1da177e4 | 2225 | |
1b784140 | 2226 | int sock_no_sendmsg(struct socket *sock, struct msghdr *m, size_t len) |
1da177e4 LT |
2227 | { |
2228 | return -EOPNOTSUPP; | |
2229 | } | |
2a91525c | 2230 | EXPORT_SYMBOL(sock_no_sendmsg); |
1da177e4 | 2231 | |
1b784140 YX |
2232 | int sock_no_recvmsg(struct socket *sock, struct msghdr *m, size_t len, |
2233 | int flags) | |
1da177e4 LT |
2234 | { |
2235 | return -EOPNOTSUPP; | |
2236 | } | |
2a91525c | 2237 | EXPORT_SYMBOL(sock_no_recvmsg); |
1da177e4 LT |
2238 | |
2239 | int sock_no_mmap(struct file *file, struct socket *sock, struct vm_area_struct *vma) | |
2240 | { | |
2241 | /* Mirror missing mmap method error code */ | |
2242 | return -ENODEV; | |
2243 | } | |
2a91525c | 2244 | EXPORT_SYMBOL(sock_no_mmap); |
1da177e4 LT |
2245 | |
2246 | ssize_t sock_no_sendpage(struct socket *sock, struct page *page, int offset, size_t size, int flags) | |
2247 | { | |
2248 | ssize_t res; | |
2249 | struct msghdr msg = {.msg_flags = flags}; | |
2250 | struct kvec iov; | |
2251 | char *kaddr = kmap(page); | |
2252 | iov.iov_base = kaddr + offset; | |
2253 | iov.iov_len = size; | |
2254 | res = kernel_sendmsg(sock, &msg, &iov, 1, size); | |
2255 | kunmap(page); | |
2256 | return res; | |
2257 | } | |
2a91525c | 2258 | EXPORT_SYMBOL(sock_no_sendpage); |
1da177e4 LT |
2259 | |
2260 | /* | |
2261 | * Default Socket Callbacks | |
2262 | */ | |
2263 | ||
2264 | static void sock_def_wakeup(struct sock *sk) | |
2265 | { | |
43815482 ED |
2266 | struct socket_wq *wq; |
2267 | ||
2268 | rcu_read_lock(); | |
2269 | wq = rcu_dereference(sk->sk_wq); | |
1ce0bf50 | 2270 | if (skwq_has_sleeper(wq)) |
43815482 ED |
2271 | wake_up_interruptible_all(&wq->wait); |
2272 | rcu_read_unlock(); | |
1da177e4 LT |
2273 | } |
2274 | ||
2275 | static void sock_def_error_report(struct sock *sk) | |
2276 | { | |
43815482 ED |
2277 | struct socket_wq *wq; |
2278 | ||
2279 | rcu_read_lock(); | |
2280 | wq = rcu_dereference(sk->sk_wq); | |
1ce0bf50 | 2281 | if (skwq_has_sleeper(wq)) |
43815482 | 2282 | wake_up_interruptible_poll(&wq->wait, POLLERR); |
8d8ad9d7 | 2283 | sk_wake_async(sk, SOCK_WAKE_IO, POLL_ERR); |
43815482 | 2284 | rcu_read_unlock(); |
1da177e4 LT |
2285 | } |
2286 | ||
676d2369 | 2287 | static void sock_def_readable(struct sock *sk) |
1da177e4 | 2288 | { |
43815482 ED |
2289 | struct socket_wq *wq; |
2290 | ||
2291 | rcu_read_lock(); | |
2292 | wq = rcu_dereference(sk->sk_wq); | |
1ce0bf50 | 2293 | if (skwq_has_sleeper(wq)) |
2c6607c6 | 2294 | wake_up_interruptible_sync_poll(&wq->wait, POLLIN | POLLPRI | |
37e5540b | 2295 | POLLRDNORM | POLLRDBAND); |
8d8ad9d7 | 2296 | sk_wake_async(sk, SOCK_WAKE_WAITD, POLL_IN); |
43815482 | 2297 | rcu_read_unlock(); |
1da177e4 LT |
2298 | } |
2299 | ||
2300 | static void sock_def_write_space(struct sock *sk) | |
2301 | { | |
43815482 ED |
2302 | struct socket_wq *wq; |
2303 | ||
2304 | rcu_read_lock(); | |
1da177e4 LT |
2305 | |
2306 | /* Do not wake up a writer until he can make "significant" | |
2307 | * progress. --DaveM | |
2308 | */ | |
e71a4783 | 2309 | if ((atomic_read(&sk->sk_wmem_alloc) << 1) <= sk->sk_sndbuf) { |
43815482 | 2310 | wq = rcu_dereference(sk->sk_wq); |
1ce0bf50 | 2311 | if (skwq_has_sleeper(wq)) |
43815482 | 2312 | wake_up_interruptible_sync_poll(&wq->wait, POLLOUT | |
37e5540b | 2313 | POLLWRNORM | POLLWRBAND); |
1da177e4 LT |
2314 | |
2315 | /* Should agree with poll, otherwise some programs break */ | |
2316 | if (sock_writeable(sk)) | |
8d8ad9d7 | 2317 | sk_wake_async(sk, SOCK_WAKE_SPACE, POLL_OUT); |
1da177e4 LT |
2318 | } |
2319 | ||
43815482 | 2320 | rcu_read_unlock(); |
1da177e4 LT |
2321 | } |
2322 | ||
2323 | static void sock_def_destruct(struct sock *sk) | |
2324 | { | |
1da177e4 LT |
2325 | } |
2326 | ||
2327 | void sk_send_sigurg(struct sock *sk) | |
2328 | { | |
2329 | if (sk->sk_socket && sk->sk_socket->file) | |
2330 | if (send_sigurg(&sk->sk_socket->file->f_owner)) | |
8d8ad9d7 | 2331 | sk_wake_async(sk, SOCK_WAKE_URG, POLL_PRI); |
1da177e4 | 2332 | } |
2a91525c | 2333 | EXPORT_SYMBOL(sk_send_sigurg); |
1da177e4 LT |
2334 | |
2335 | void sk_reset_timer(struct sock *sk, struct timer_list* timer, | |
2336 | unsigned long expires) | |
2337 | { | |
2338 | if (!mod_timer(timer, expires)) | |
2339 | sock_hold(sk); | |
2340 | } | |
1da177e4 LT |
2341 | EXPORT_SYMBOL(sk_reset_timer); |
2342 | ||
2343 | void sk_stop_timer(struct sock *sk, struct timer_list* timer) | |
2344 | { | |
25cc4ae9 | 2345 | if (del_timer(timer)) |
1da177e4 LT |
2346 | __sock_put(sk); |
2347 | } | |
1da177e4 LT |
2348 | EXPORT_SYMBOL(sk_stop_timer); |
2349 | ||
2350 | void sock_init_data(struct socket *sock, struct sock *sk) | |
2351 | { | |
2352 | skb_queue_head_init(&sk->sk_receive_queue); | |
2353 | skb_queue_head_init(&sk->sk_write_queue); | |
2354 | skb_queue_head_init(&sk->sk_error_queue); | |
2355 | ||
2356 | sk->sk_send_head = NULL; | |
2357 | ||
2358 | init_timer(&sk->sk_timer); | |
4ec93edb | 2359 | |
1da177e4 LT |
2360 | sk->sk_allocation = GFP_KERNEL; |
2361 | sk->sk_rcvbuf = sysctl_rmem_default; | |
2362 | sk->sk_sndbuf = sysctl_wmem_default; | |
2363 | sk->sk_state = TCP_CLOSE; | |
972692e0 | 2364 | sk_set_socket(sk, sock); |
1da177e4 LT |
2365 | |
2366 | sock_set_flag(sk, SOCK_ZAPPED); | |
2367 | ||
e71a4783 | 2368 | if (sock) { |
1da177e4 | 2369 | sk->sk_type = sock->type; |
43815482 | 2370 | sk->sk_wq = sock->wq; |
1da177e4 LT |
2371 | sock->sk = sk; |
2372 | } else | |
43815482 | 2373 | sk->sk_wq = NULL; |
1da177e4 | 2374 | |
1da177e4 | 2375 | rwlock_init(&sk->sk_callback_lock); |
443aef0e PZ |
2376 | lockdep_set_class_and_name(&sk->sk_callback_lock, |
2377 | af_callback_keys + sk->sk_family, | |
2378 | af_family_clock_key_strings[sk->sk_family]); | |
1da177e4 LT |
2379 | |
2380 | sk->sk_state_change = sock_def_wakeup; | |
2381 | sk->sk_data_ready = sock_def_readable; | |
2382 | sk->sk_write_space = sock_def_write_space; | |
2383 | sk->sk_error_report = sock_def_error_report; | |
2384 | sk->sk_destruct = sock_def_destruct; | |
2385 | ||
5640f768 ED |
2386 | sk->sk_frag.page = NULL; |
2387 | sk->sk_frag.offset = 0; | |
ef64a54f | 2388 | sk->sk_peek_off = -1; |
1da177e4 | 2389 | |
109f6e39 EB |
2390 | sk->sk_peer_pid = NULL; |
2391 | sk->sk_peer_cred = NULL; | |
1da177e4 LT |
2392 | sk->sk_write_pending = 0; |
2393 | sk->sk_rcvlowat = 1; | |
2394 | sk->sk_rcvtimeo = MAX_SCHEDULE_TIMEOUT; | |
2395 | sk->sk_sndtimeo = MAX_SCHEDULE_TIMEOUT; | |
2396 | ||
f37f0afb | 2397 | sk->sk_stamp = ktime_set(-1L, 0); |
1da177e4 | 2398 | |
e0d1095a | 2399 | #ifdef CONFIG_NET_RX_BUSY_POLL |
06021292 | 2400 | sk->sk_napi_id = 0; |
64b0dc51 | 2401 | sk->sk_ll_usec = sysctl_net_busy_read; |
06021292 ET |
2402 | #endif |
2403 | ||
62748f32 | 2404 | sk->sk_max_pacing_rate = ~0U; |
7eec4174 | 2405 | sk->sk_pacing_rate = ~0U; |
70da268b | 2406 | sk->sk_incoming_cpu = -1; |
4dc6dc71 ED |
2407 | /* |
2408 | * Before updating sk_refcnt, we must commit prior changes to memory | |
2409 | * (Documentation/RCU/rculist_nulls.txt for details) | |
2410 | */ | |
2411 | smp_wmb(); | |
1da177e4 | 2412 | atomic_set(&sk->sk_refcnt, 1); |
33c732c3 | 2413 | atomic_set(&sk->sk_drops, 0); |
1da177e4 | 2414 | } |
2a91525c | 2415 | EXPORT_SYMBOL(sock_init_data); |
1da177e4 | 2416 | |
b5606c2d | 2417 | void lock_sock_nested(struct sock *sk, int subclass) |
1da177e4 LT |
2418 | { |
2419 | might_sleep(); | |
a5b5bb9a | 2420 | spin_lock_bh(&sk->sk_lock.slock); |
d2e9117c | 2421 | if (sk->sk_lock.owned) |
1da177e4 | 2422 | __lock_sock(sk); |
d2e9117c | 2423 | sk->sk_lock.owned = 1; |
a5b5bb9a IM |
2424 | spin_unlock(&sk->sk_lock.slock); |
2425 | /* | |
2426 | * The sk_lock has mutex_lock() semantics here: | |
2427 | */ | |
fcc70d5f | 2428 | mutex_acquire(&sk->sk_lock.dep_map, subclass, 0, _RET_IP_); |
a5b5bb9a | 2429 | local_bh_enable(); |
1da177e4 | 2430 | } |
fcc70d5f | 2431 | EXPORT_SYMBOL(lock_sock_nested); |
1da177e4 | 2432 | |
b5606c2d | 2433 | void release_sock(struct sock *sk) |
1da177e4 | 2434 | { |
a5b5bb9a IM |
2435 | /* |
2436 | * The sk_lock has mutex_unlock() semantics: | |
2437 | */ | |
2438 | mutex_release(&sk->sk_lock.dep_map, 1, _RET_IP_); | |
2439 | ||
2440 | spin_lock_bh(&sk->sk_lock.slock); | |
1da177e4 LT |
2441 | if (sk->sk_backlog.tail) |
2442 | __release_sock(sk); | |
46d3ceab | 2443 | |
c3f9b018 ED |
2444 | /* Warning : release_cb() might need to release sk ownership, |
2445 | * ie call sock_release_ownership(sk) before us. | |
2446 | */ | |
46d3ceab ED |
2447 | if (sk->sk_prot->release_cb) |
2448 | sk->sk_prot->release_cb(sk); | |
2449 | ||
c3f9b018 | 2450 | sock_release_ownership(sk); |
a5b5bb9a IM |
2451 | if (waitqueue_active(&sk->sk_lock.wq)) |
2452 | wake_up(&sk->sk_lock.wq); | |
2453 | spin_unlock_bh(&sk->sk_lock.slock); | |
1da177e4 LT |
2454 | } |
2455 | EXPORT_SYMBOL(release_sock); | |
2456 | ||
8a74ad60 ED |
2457 | /** |
2458 | * lock_sock_fast - fast version of lock_sock | |
2459 | * @sk: socket | |
2460 | * | |
2461 | * This version should be used for very small section, where process wont block | |
2462 | * return false if fast path is taken | |
2463 | * sk_lock.slock locked, owned = 0, BH disabled | |
2464 | * return true if slow path is taken | |
2465 | * sk_lock.slock unlocked, owned = 1, BH enabled | |
2466 | */ | |
2467 | bool lock_sock_fast(struct sock *sk) | |
2468 | { | |
2469 | might_sleep(); | |
2470 | spin_lock_bh(&sk->sk_lock.slock); | |
2471 | ||
2472 | if (!sk->sk_lock.owned) | |
2473 | /* | |
2474 | * Note : We must disable BH | |
2475 | */ | |
2476 | return false; | |
2477 | ||
2478 | __lock_sock(sk); | |
2479 | sk->sk_lock.owned = 1; | |
2480 | spin_unlock(&sk->sk_lock.slock); | |
2481 | /* | |
2482 | * The sk_lock has mutex_lock() semantics here: | |
2483 | */ | |
2484 | mutex_acquire(&sk->sk_lock.dep_map, 0, 0, _RET_IP_); | |
2485 | local_bh_enable(); | |
2486 | return true; | |
2487 | } | |
2488 | EXPORT_SYMBOL(lock_sock_fast); | |
2489 | ||
1da177e4 | 2490 | int sock_get_timestamp(struct sock *sk, struct timeval __user *userstamp) |
4ec93edb | 2491 | { |
b7aa0bf7 | 2492 | struct timeval tv; |
1da177e4 | 2493 | if (!sock_flag(sk, SOCK_TIMESTAMP)) |
20d49473 | 2494 | sock_enable_timestamp(sk, SOCK_TIMESTAMP); |
b7aa0bf7 ED |
2495 | tv = ktime_to_timeval(sk->sk_stamp); |
2496 | if (tv.tv_sec == -1) | |
1da177e4 | 2497 | return -ENOENT; |
b7aa0bf7 ED |
2498 | if (tv.tv_sec == 0) { |
2499 | sk->sk_stamp = ktime_get_real(); | |
2500 | tv = ktime_to_timeval(sk->sk_stamp); | |
2501 | } | |
2502 | return copy_to_user(userstamp, &tv, sizeof(tv)) ? -EFAULT : 0; | |
4ec93edb | 2503 | } |
1da177e4 LT |
2504 | EXPORT_SYMBOL(sock_get_timestamp); |
2505 | ||
ae40eb1e ED |
2506 | int sock_get_timestampns(struct sock *sk, struct timespec __user *userstamp) |
2507 | { | |
2508 | struct timespec ts; | |
2509 | if (!sock_flag(sk, SOCK_TIMESTAMP)) | |
20d49473 | 2510 | sock_enable_timestamp(sk, SOCK_TIMESTAMP); |
ae40eb1e ED |
2511 | ts = ktime_to_timespec(sk->sk_stamp); |
2512 | if (ts.tv_sec == -1) | |
2513 | return -ENOENT; | |
2514 | if (ts.tv_sec == 0) { | |
2515 | sk->sk_stamp = ktime_get_real(); | |
2516 | ts = ktime_to_timespec(sk->sk_stamp); | |
2517 | } | |
2518 | return copy_to_user(userstamp, &ts, sizeof(ts)) ? -EFAULT : 0; | |
2519 | } | |
2520 | EXPORT_SYMBOL(sock_get_timestampns); | |
2521 | ||
20d49473 | 2522 | void sock_enable_timestamp(struct sock *sk, int flag) |
4ec93edb | 2523 | { |
20d49473 | 2524 | if (!sock_flag(sk, flag)) { |
08e29af3 ED |
2525 | unsigned long previous_flags = sk->sk_flags; |
2526 | ||
20d49473 PO |
2527 | sock_set_flag(sk, flag); |
2528 | /* | |
2529 | * we just set one of the two flags which require net | |
2530 | * time stamping, but time stamping might have been on | |
2531 | * already because of the other one | |
2532 | */ | |
080a270f HFS |
2533 | if (sock_needs_netstamp(sk) && |
2534 | !(previous_flags & SK_FLAGS_TIMESTAMP)) | |
20d49473 | 2535 | net_enable_timestamp(); |
1da177e4 LT |
2536 | } |
2537 | } | |
1da177e4 | 2538 | |
cb820f8e RC |
2539 | int sock_recv_errqueue(struct sock *sk, struct msghdr *msg, int len, |
2540 | int level, int type) | |
2541 | { | |
2542 | struct sock_exterr_skb *serr; | |
364a9e93 | 2543 | struct sk_buff *skb; |
cb820f8e RC |
2544 | int copied, err; |
2545 | ||
2546 | err = -EAGAIN; | |
364a9e93 | 2547 | skb = sock_dequeue_err_skb(sk); |
cb820f8e RC |
2548 | if (skb == NULL) |
2549 | goto out; | |
2550 | ||
2551 | copied = skb->len; | |
2552 | if (copied > len) { | |
2553 | msg->msg_flags |= MSG_TRUNC; | |
2554 | copied = len; | |
2555 | } | |
51f3d02b | 2556 | err = skb_copy_datagram_msg(skb, 0, msg, copied); |
cb820f8e RC |
2557 | if (err) |
2558 | goto out_free_skb; | |
2559 | ||
2560 | sock_recv_timestamp(msg, sk, skb); | |
2561 | ||
2562 | serr = SKB_EXT_ERR(skb); | |
2563 | put_cmsg(msg, level, type, sizeof(serr->ee), &serr->ee); | |
2564 | ||
2565 | msg->msg_flags |= MSG_ERRQUEUE; | |
2566 | err = copied; | |
2567 | ||
cb820f8e RC |
2568 | out_free_skb: |
2569 | kfree_skb(skb); | |
2570 | out: | |
2571 | return err; | |
2572 | } | |
2573 | EXPORT_SYMBOL(sock_recv_errqueue); | |
2574 | ||
1da177e4 LT |
2575 | /* |
2576 | * Get a socket option on an socket. | |
2577 | * | |
2578 | * FIX: POSIX 1003.1g is very ambiguous here. It states that | |
2579 | * asynchronous errors should be reported by getsockopt. We assume | |
2580 | * this means if you specify SO_ERROR (otherwise whats the point of it). | |
2581 | */ | |
2582 | int sock_common_getsockopt(struct socket *sock, int level, int optname, | |
2583 | char __user *optval, int __user *optlen) | |
2584 | { | |
2585 | struct sock *sk = sock->sk; | |
2586 | ||
2587 | return sk->sk_prot->getsockopt(sk, level, optname, optval, optlen); | |
2588 | } | |
1da177e4 LT |
2589 | EXPORT_SYMBOL(sock_common_getsockopt); |
2590 | ||
3fdadf7d | 2591 | #ifdef CONFIG_COMPAT |
543d9cfe ACM |
2592 | int compat_sock_common_getsockopt(struct socket *sock, int level, int optname, |
2593 | char __user *optval, int __user *optlen) | |
3fdadf7d DM |
2594 | { |
2595 | struct sock *sk = sock->sk; | |
2596 | ||
1e51f951 | 2597 | if (sk->sk_prot->compat_getsockopt != NULL) |
543d9cfe ACM |
2598 | return sk->sk_prot->compat_getsockopt(sk, level, optname, |
2599 | optval, optlen); | |
3fdadf7d DM |
2600 | return sk->sk_prot->getsockopt(sk, level, optname, optval, optlen); |
2601 | } | |
2602 | EXPORT_SYMBOL(compat_sock_common_getsockopt); | |
2603 | #endif | |
2604 | ||
1b784140 YX |
2605 | int sock_common_recvmsg(struct socket *sock, struct msghdr *msg, size_t size, |
2606 | int flags) | |
1da177e4 LT |
2607 | { |
2608 | struct sock *sk = sock->sk; | |
2609 | int addr_len = 0; | |
2610 | int err; | |
2611 | ||
1b784140 | 2612 | err = sk->sk_prot->recvmsg(sk, msg, size, flags & MSG_DONTWAIT, |
1da177e4 LT |
2613 | flags & ~MSG_DONTWAIT, &addr_len); |
2614 | if (err >= 0) | |
2615 | msg->msg_namelen = addr_len; | |
2616 | return err; | |
2617 | } | |
1da177e4 LT |
2618 | EXPORT_SYMBOL(sock_common_recvmsg); |
2619 | ||
2620 | /* | |
2621 | * Set socket options on an inet socket. | |
2622 | */ | |
2623 | int sock_common_setsockopt(struct socket *sock, int level, int optname, | |
b7058842 | 2624 | char __user *optval, unsigned int optlen) |
1da177e4 LT |
2625 | { |
2626 | struct sock *sk = sock->sk; | |
2627 | ||
2628 | return sk->sk_prot->setsockopt(sk, level, optname, optval, optlen); | |
2629 | } | |
1da177e4 LT |
2630 | EXPORT_SYMBOL(sock_common_setsockopt); |
2631 | ||
3fdadf7d | 2632 | #ifdef CONFIG_COMPAT |
543d9cfe | 2633 | int compat_sock_common_setsockopt(struct socket *sock, int level, int optname, |
b7058842 | 2634 | char __user *optval, unsigned int optlen) |
3fdadf7d DM |
2635 | { |
2636 | struct sock *sk = sock->sk; | |
2637 | ||
543d9cfe ACM |
2638 | if (sk->sk_prot->compat_setsockopt != NULL) |
2639 | return sk->sk_prot->compat_setsockopt(sk, level, optname, | |
2640 | optval, optlen); | |
3fdadf7d DM |
2641 | return sk->sk_prot->setsockopt(sk, level, optname, optval, optlen); |
2642 | } | |
2643 | EXPORT_SYMBOL(compat_sock_common_setsockopt); | |
2644 | #endif | |
2645 | ||
1da177e4 LT |
2646 | void sk_common_release(struct sock *sk) |
2647 | { | |
2648 | if (sk->sk_prot->destroy) | |
2649 | sk->sk_prot->destroy(sk); | |
2650 | ||
2651 | /* | |
2652 | * Observation: when sock_common_release is called, processes have | |
2653 | * no access to socket. But net still has. | |
2654 | * Step one, detach it from networking: | |
2655 | * | |
2656 | * A. Remove from hash tables. | |
2657 | */ | |
2658 | ||
2659 | sk->sk_prot->unhash(sk); | |
2660 | ||
2661 | /* | |
2662 | * In this point socket cannot receive new packets, but it is possible | |
2663 | * that some packets are in flight because some CPU runs receiver and | |
2664 | * did hash table lookup before we unhashed socket. They will achieve | |
2665 | * receive queue and will be purged by socket destructor. | |
2666 | * | |
2667 | * Also we still have packets pending on receive queue and probably, | |
2668 | * our own packets waiting in device queues. sock_destroy will drain | |
2669 | * receive queue, but transmitted packets will delay socket destruction | |
2670 | * until the last reference will be released. | |
2671 | */ | |
2672 | ||
2673 | sock_orphan(sk); | |
2674 | ||
2675 | xfrm_sk_free_policy(sk); | |
2676 | ||
e6848976 | 2677 | sk_refcnt_debug_release(sk); |
5640f768 ED |
2678 | |
2679 | if (sk->sk_frag.page) { | |
2680 | put_page(sk->sk_frag.page); | |
2681 | sk->sk_frag.page = NULL; | |
2682 | } | |
2683 | ||
1da177e4 LT |
2684 | sock_put(sk); |
2685 | } | |
1da177e4 LT |
2686 | EXPORT_SYMBOL(sk_common_release); |
2687 | ||
13ff3d6f PE |
2688 | #ifdef CONFIG_PROC_FS |
2689 | #define PROTO_INUSE_NR 64 /* should be enough for the first time */ | |
1338d466 PE |
2690 | struct prot_inuse { |
2691 | int val[PROTO_INUSE_NR]; | |
2692 | }; | |
13ff3d6f PE |
2693 | |
2694 | static DECLARE_BITMAP(proto_inuse_idx, PROTO_INUSE_NR); | |
70ee1159 PE |
2695 | |
2696 | #ifdef CONFIG_NET_NS | |
2697 | void sock_prot_inuse_add(struct net *net, struct proto *prot, int val) | |
2698 | { | |
d6d9ca0f | 2699 | __this_cpu_add(net->core.inuse->val[prot->inuse_idx], val); |
70ee1159 PE |
2700 | } |
2701 | EXPORT_SYMBOL_GPL(sock_prot_inuse_add); | |
2702 | ||
2703 | int sock_prot_inuse_get(struct net *net, struct proto *prot) | |
2704 | { | |
2705 | int cpu, idx = prot->inuse_idx; | |
2706 | int res = 0; | |
2707 | ||
2708 | for_each_possible_cpu(cpu) | |
2709 | res += per_cpu_ptr(net->core.inuse, cpu)->val[idx]; | |
2710 | ||
2711 | return res >= 0 ? res : 0; | |
2712 | } | |
2713 | EXPORT_SYMBOL_GPL(sock_prot_inuse_get); | |
2714 | ||
2c8c1e72 | 2715 | static int __net_init sock_inuse_init_net(struct net *net) |
70ee1159 PE |
2716 | { |
2717 | net->core.inuse = alloc_percpu(struct prot_inuse); | |
2718 | return net->core.inuse ? 0 : -ENOMEM; | |
2719 | } | |
2720 | ||
2c8c1e72 | 2721 | static void __net_exit sock_inuse_exit_net(struct net *net) |
70ee1159 PE |
2722 | { |
2723 | free_percpu(net->core.inuse); | |
2724 | } | |
2725 | ||
2726 | static struct pernet_operations net_inuse_ops = { | |
2727 | .init = sock_inuse_init_net, | |
2728 | .exit = sock_inuse_exit_net, | |
2729 | }; | |
2730 | ||
2731 | static __init int net_inuse_init(void) | |
2732 | { | |
2733 | if (register_pernet_subsys(&net_inuse_ops)) | |
2734 | panic("Cannot initialize net inuse counters"); | |
2735 | ||
2736 | return 0; | |
2737 | } | |
2738 | ||
2739 | core_initcall(net_inuse_init); | |
2740 | #else | |
1338d466 PE |
2741 | static DEFINE_PER_CPU(struct prot_inuse, prot_inuse); |
2742 | ||
c29a0bc4 | 2743 | void sock_prot_inuse_add(struct net *net, struct proto *prot, int val) |
1338d466 | 2744 | { |
d6d9ca0f | 2745 | __this_cpu_add(prot_inuse.val[prot->inuse_idx], val); |
1338d466 PE |
2746 | } |
2747 | EXPORT_SYMBOL_GPL(sock_prot_inuse_add); | |
2748 | ||
c29a0bc4 | 2749 | int sock_prot_inuse_get(struct net *net, struct proto *prot) |
1338d466 PE |
2750 | { |
2751 | int cpu, idx = prot->inuse_idx; | |
2752 | int res = 0; | |
2753 | ||
2754 | for_each_possible_cpu(cpu) | |
2755 | res += per_cpu(prot_inuse, cpu).val[idx]; | |
2756 | ||
2757 | return res >= 0 ? res : 0; | |
2758 | } | |
2759 | EXPORT_SYMBOL_GPL(sock_prot_inuse_get); | |
70ee1159 | 2760 | #endif |
13ff3d6f PE |
2761 | |
2762 | static void assign_proto_idx(struct proto *prot) | |
2763 | { | |
2764 | prot->inuse_idx = find_first_zero_bit(proto_inuse_idx, PROTO_INUSE_NR); | |
2765 | ||
2766 | if (unlikely(prot->inuse_idx == PROTO_INUSE_NR - 1)) { | |
e005d193 | 2767 | pr_err("PROTO_INUSE_NR exhausted\n"); |
13ff3d6f PE |
2768 | return; |
2769 | } | |
2770 | ||
2771 | set_bit(prot->inuse_idx, proto_inuse_idx); | |
2772 | } | |
2773 | ||
2774 | static void release_proto_idx(struct proto *prot) | |
2775 | { | |
2776 | if (prot->inuse_idx != PROTO_INUSE_NR - 1) | |
2777 | clear_bit(prot->inuse_idx, proto_inuse_idx); | |
2778 | } | |
2779 | #else | |
2780 | static inline void assign_proto_idx(struct proto *prot) | |
2781 | { | |
2782 | } | |
2783 | ||
2784 | static inline void release_proto_idx(struct proto *prot) | |
2785 | { | |
2786 | } | |
2787 | #endif | |
2788 | ||
0159dfd3 ED |
2789 | static void req_prot_cleanup(struct request_sock_ops *rsk_prot) |
2790 | { | |
2791 | if (!rsk_prot) | |
2792 | return; | |
2793 | kfree(rsk_prot->slab_name); | |
2794 | rsk_prot->slab_name = NULL; | |
adf78eda JL |
2795 | kmem_cache_destroy(rsk_prot->slab); |
2796 | rsk_prot->slab = NULL; | |
0159dfd3 ED |
2797 | } |
2798 | ||
2799 | static int req_prot_init(const struct proto *prot) | |
2800 | { | |
2801 | struct request_sock_ops *rsk_prot = prot->rsk_prot; | |
2802 | ||
2803 | if (!rsk_prot) | |
2804 | return 0; | |
2805 | ||
2806 | rsk_prot->slab_name = kasprintf(GFP_KERNEL, "request_sock_%s", | |
2807 | prot->name); | |
2808 | if (!rsk_prot->slab_name) | |
2809 | return -ENOMEM; | |
2810 | ||
2811 | rsk_prot->slab = kmem_cache_create(rsk_prot->slab_name, | |
2812 | rsk_prot->obj_size, 0, | |
e96f78ab | 2813 | prot->slab_flags, NULL); |
0159dfd3 ED |
2814 | |
2815 | if (!rsk_prot->slab) { | |
2816 | pr_crit("%s: Can't create request sock SLAB cache!\n", | |
2817 | prot->name); | |
2818 | return -ENOMEM; | |
2819 | } | |
2820 | return 0; | |
2821 | } | |
2822 | ||
b733c007 PE |
2823 | int proto_register(struct proto *prot, int alloc_slab) |
2824 | { | |
1da177e4 LT |
2825 | if (alloc_slab) { |
2826 | prot->slab = kmem_cache_create(prot->name, prot->obj_size, 0, | |
271b72c7 ED |
2827 | SLAB_HWCACHE_ALIGN | prot->slab_flags, |
2828 | NULL); | |
1da177e4 LT |
2829 | |
2830 | if (prot->slab == NULL) { | |
e005d193 JP |
2831 | pr_crit("%s: Can't create sock SLAB cache!\n", |
2832 | prot->name); | |
60e7663d | 2833 | goto out; |
1da177e4 | 2834 | } |
2e6599cb | 2835 | |
0159dfd3 ED |
2836 | if (req_prot_init(prot)) |
2837 | goto out_free_request_sock_slab; | |
8feaf0c0 | 2838 | |
6d6ee43e | 2839 | if (prot->twsk_prot != NULL) { |
faf23422 | 2840 | prot->twsk_prot->twsk_slab_name = kasprintf(GFP_KERNEL, "tw_sock_%s", prot->name); |
8feaf0c0 | 2841 | |
7e56b5d6 | 2842 | if (prot->twsk_prot->twsk_slab_name == NULL) |
8feaf0c0 ACM |
2843 | goto out_free_request_sock_slab; |
2844 | ||
6d6ee43e | 2845 | prot->twsk_prot->twsk_slab = |
7e56b5d6 | 2846 | kmem_cache_create(prot->twsk_prot->twsk_slab_name, |
6d6ee43e | 2847 | prot->twsk_prot->twsk_obj_size, |
3ab5aee7 | 2848 | 0, |
52db70dc | 2849 | prot->slab_flags, |
20c2df83 | 2850 | NULL); |
6d6ee43e | 2851 | if (prot->twsk_prot->twsk_slab == NULL) |
8feaf0c0 ACM |
2852 | goto out_free_timewait_sock_slab_name; |
2853 | } | |
1da177e4 LT |
2854 | } |
2855 | ||
36b77a52 | 2856 | mutex_lock(&proto_list_mutex); |
1da177e4 | 2857 | list_add(&prot->node, &proto_list); |
13ff3d6f | 2858 | assign_proto_idx(prot); |
36b77a52 | 2859 | mutex_unlock(&proto_list_mutex); |
b733c007 PE |
2860 | return 0; |
2861 | ||
8feaf0c0 | 2862 | out_free_timewait_sock_slab_name: |
7e56b5d6 | 2863 | kfree(prot->twsk_prot->twsk_slab_name); |
8feaf0c0 | 2864 | out_free_request_sock_slab: |
0159dfd3 ED |
2865 | req_prot_cleanup(prot->rsk_prot); |
2866 | ||
2e6599cb ACM |
2867 | kmem_cache_destroy(prot->slab); |
2868 | prot->slab = NULL; | |
b733c007 PE |
2869 | out: |
2870 | return -ENOBUFS; | |
1da177e4 | 2871 | } |
1da177e4 LT |
2872 | EXPORT_SYMBOL(proto_register); |
2873 | ||
2874 | void proto_unregister(struct proto *prot) | |
2875 | { | |
36b77a52 | 2876 | mutex_lock(&proto_list_mutex); |
13ff3d6f | 2877 | release_proto_idx(prot); |
0a3f4358 | 2878 | list_del(&prot->node); |
36b77a52 | 2879 | mutex_unlock(&proto_list_mutex); |
1da177e4 | 2880 | |
adf78eda JL |
2881 | kmem_cache_destroy(prot->slab); |
2882 | prot->slab = NULL; | |
1da177e4 | 2883 | |
0159dfd3 | 2884 | req_prot_cleanup(prot->rsk_prot); |
2e6599cb | 2885 | |
6d6ee43e | 2886 | if (prot->twsk_prot != NULL && prot->twsk_prot->twsk_slab != NULL) { |
6d6ee43e | 2887 | kmem_cache_destroy(prot->twsk_prot->twsk_slab); |
7e56b5d6 | 2888 | kfree(prot->twsk_prot->twsk_slab_name); |
6d6ee43e | 2889 | prot->twsk_prot->twsk_slab = NULL; |
8feaf0c0 | 2890 | } |
1da177e4 | 2891 | } |
1da177e4 LT |
2892 | EXPORT_SYMBOL(proto_unregister); |
2893 | ||
2894 | #ifdef CONFIG_PROC_FS | |
1da177e4 | 2895 | static void *proto_seq_start(struct seq_file *seq, loff_t *pos) |
36b77a52 | 2896 | __acquires(proto_list_mutex) |
1da177e4 | 2897 | { |
36b77a52 | 2898 | mutex_lock(&proto_list_mutex); |
60f0438a | 2899 | return seq_list_start_head(&proto_list, *pos); |
1da177e4 LT |
2900 | } |
2901 | ||
2902 | static void *proto_seq_next(struct seq_file *seq, void *v, loff_t *pos) | |
2903 | { | |
60f0438a | 2904 | return seq_list_next(v, &proto_list, pos); |
1da177e4 LT |
2905 | } |
2906 | ||
2907 | static void proto_seq_stop(struct seq_file *seq, void *v) | |
36b77a52 | 2908 | __releases(proto_list_mutex) |
1da177e4 | 2909 | { |
36b77a52 | 2910 | mutex_unlock(&proto_list_mutex); |
1da177e4 LT |
2911 | } |
2912 | ||
2913 | static char proto_method_implemented(const void *method) | |
2914 | { | |
2915 | return method == NULL ? 'n' : 'y'; | |
2916 | } | |
180d8cd9 GC |
2917 | static long sock_prot_memory_allocated(struct proto *proto) |
2918 | { | |
cb75a36c | 2919 | return proto->memory_allocated != NULL ? proto_memory_allocated(proto) : -1L; |
180d8cd9 GC |
2920 | } |
2921 | ||
2922 | static char *sock_prot_memory_pressure(struct proto *proto) | |
2923 | { | |
2924 | return proto->memory_pressure != NULL ? | |
2925 | proto_memory_pressure(proto) ? "yes" : "no" : "NI"; | |
2926 | } | |
1da177e4 LT |
2927 | |
2928 | static void proto_seq_printf(struct seq_file *seq, struct proto *proto) | |
2929 | { | |
180d8cd9 | 2930 | |
8d987e5c | 2931 | seq_printf(seq, "%-9s %4u %6d %6ld %-3s %6u %-3s %-10s " |
1da177e4 LT |
2932 | "%2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c\n", |
2933 | proto->name, | |
2934 | proto->obj_size, | |
14e943db | 2935 | sock_prot_inuse_get(seq_file_net(seq), proto), |
180d8cd9 GC |
2936 | sock_prot_memory_allocated(proto), |
2937 | sock_prot_memory_pressure(proto), | |
1da177e4 LT |
2938 | proto->max_header, |
2939 | proto->slab == NULL ? "no" : "yes", | |
2940 | module_name(proto->owner), | |
2941 | proto_method_implemented(proto->close), | |
2942 | proto_method_implemented(proto->connect), | |
2943 | proto_method_implemented(proto->disconnect), | |
2944 | proto_method_implemented(proto->accept), | |
2945 | proto_method_implemented(proto->ioctl), | |
2946 | proto_method_implemented(proto->init), | |
2947 | proto_method_implemented(proto->destroy), | |
2948 | proto_method_implemented(proto->shutdown), | |
2949 | proto_method_implemented(proto->setsockopt), | |
2950 | proto_method_implemented(proto->getsockopt), | |
2951 | proto_method_implemented(proto->sendmsg), | |
2952 | proto_method_implemented(proto->recvmsg), | |
2953 | proto_method_implemented(proto->sendpage), | |
2954 | proto_method_implemented(proto->bind), | |
2955 | proto_method_implemented(proto->backlog_rcv), | |
2956 | proto_method_implemented(proto->hash), | |
2957 | proto_method_implemented(proto->unhash), | |
2958 | proto_method_implemented(proto->get_port), | |
2959 | proto_method_implemented(proto->enter_memory_pressure)); | |
2960 | } | |
2961 | ||
2962 | static int proto_seq_show(struct seq_file *seq, void *v) | |
2963 | { | |
60f0438a | 2964 | if (v == &proto_list) |
1da177e4 LT |
2965 | seq_printf(seq, "%-9s %-4s %-8s %-6s %-5s %-7s %-4s %-10s %s", |
2966 | "protocol", | |
2967 | "size", | |
2968 | "sockets", | |
2969 | "memory", | |
2970 | "press", | |
2971 | "maxhdr", | |
2972 | "slab", | |
2973 | "module", | |
2974 | "cl co di ac io in de sh ss gs se re sp bi br ha uh gp em\n"); | |
2975 | else | |
60f0438a | 2976 | proto_seq_printf(seq, list_entry(v, struct proto, node)); |
1da177e4 LT |
2977 | return 0; |
2978 | } | |
2979 | ||
f690808e | 2980 | static const struct seq_operations proto_seq_ops = { |
1da177e4 LT |
2981 | .start = proto_seq_start, |
2982 | .next = proto_seq_next, | |
2983 | .stop = proto_seq_stop, | |
2984 | .show = proto_seq_show, | |
2985 | }; | |
2986 | ||
2987 | static int proto_seq_open(struct inode *inode, struct file *file) | |
2988 | { | |
14e943db ED |
2989 | return seq_open_net(inode, file, &proto_seq_ops, |
2990 | sizeof(struct seq_net_private)); | |
1da177e4 LT |
2991 | } |
2992 | ||
9a32144e | 2993 | static const struct file_operations proto_seq_fops = { |
1da177e4 LT |
2994 | .owner = THIS_MODULE, |
2995 | .open = proto_seq_open, | |
2996 | .read = seq_read, | |
2997 | .llseek = seq_lseek, | |
14e943db ED |
2998 | .release = seq_release_net, |
2999 | }; | |
3000 | ||
3001 | static __net_init int proto_init_net(struct net *net) | |
3002 | { | |
d4beaa66 | 3003 | if (!proc_create("protocols", S_IRUGO, net->proc_net, &proto_seq_fops)) |
14e943db ED |
3004 | return -ENOMEM; |
3005 | ||
3006 | return 0; | |
3007 | } | |
3008 | ||
3009 | static __net_exit void proto_exit_net(struct net *net) | |
3010 | { | |
ece31ffd | 3011 | remove_proc_entry("protocols", net->proc_net); |
14e943db ED |
3012 | } |
3013 | ||
3014 | ||
3015 | static __net_initdata struct pernet_operations proto_net_ops = { | |
3016 | .init = proto_init_net, | |
3017 | .exit = proto_exit_net, | |
1da177e4 LT |
3018 | }; |
3019 | ||
3020 | static int __init proto_init(void) | |
3021 | { | |
14e943db | 3022 | return register_pernet_subsys(&proto_net_ops); |
1da177e4 LT |
3023 | } |
3024 | ||
3025 | subsys_initcall(proto_init); | |
3026 | ||
3027 | #endif /* PROC_FS */ |