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" , |
456db6a4 | 224 | "sk_lock-AF_NFC" , "sk_lock-AF_VSOCK" , "sk_lock-AF_MAX" |
a5b5bb9a | 225 | }; |
36cbd3dc | 226 | static const char *const af_family_slock_key_strings[AF_MAX+1] = { |
a5b5bb9a IM |
227 | "slock-AF_UNSPEC", "slock-AF_UNIX" , "slock-AF_INET" , |
228 | "slock-AF_AX25" , "slock-AF_IPX" , "slock-AF_APPLETALK", | |
229 | "slock-AF_NETROM", "slock-AF_BRIDGE" , "slock-AF_ATMPVC" , | |
230 | "slock-AF_X25" , "slock-AF_INET6" , "slock-AF_ROSE" , | |
231 | "slock-AF_DECnet", "slock-AF_NETBEUI" , "slock-AF_SECURITY" , | |
232 | "slock-AF_KEY" , "slock-AF_NETLINK" , "slock-AF_PACKET" , | |
233 | "slock-AF_ASH" , "slock-AF_ECONET" , "slock-AF_ATMSVC" , | |
cbd151bf | 234 | "slock-AF_RDS" , "slock-AF_SNA" , "slock-AF_IRDA" , |
a5b5bb9a | 235 | "slock-AF_PPPOX" , "slock-AF_WANPIPE" , "slock-AF_LLC" , |
cd05acfe | 236 | "slock-27" , "slock-28" , "slock-AF_CAN" , |
17926a79 | 237 | "slock-AF_TIPC" , "slock-AF_BLUETOOTH", "slock-AF_IUCV" , |
bce7b154 | 238 | "slock-AF_RXRPC" , "slock-AF_ISDN" , "slock-AF_PHONET" , |
6f107b58 | 239 | "slock-AF_IEEE802154", "slock-AF_CAIF" , "slock-AF_ALG" , |
456db6a4 | 240 | "slock-AF_NFC" , "slock-AF_VSOCK" ,"slock-AF_MAX" |
a5b5bb9a | 241 | }; |
36cbd3dc | 242 | static const char *const af_family_clock_key_strings[AF_MAX+1] = { |
443aef0e PZ |
243 | "clock-AF_UNSPEC", "clock-AF_UNIX" , "clock-AF_INET" , |
244 | "clock-AF_AX25" , "clock-AF_IPX" , "clock-AF_APPLETALK", | |
245 | "clock-AF_NETROM", "clock-AF_BRIDGE" , "clock-AF_ATMPVC" , | |
246 | "clock-AF_X25" , "clock-AF_INET6" , "clock-AF_ROSE" , | |
247 | "clock-AF_DECnet", "clock-AF_NETBEUI" , "clock-AF_SECURITY" , | |
248 | "clock-AF_KEY" , "clock-AF_NETLINK" , "clock-AF_PACKET" , | |
249 | "clock-AF_ASH" , "clock-AF_ECONET" , "clock-AF_ATMSVC" , | |
cbd151bf | 250 | "clock-AF_RDS" , "clock-AF_SNA" , "clock-AF_IRDA" , |
443aef0e | 251 | "clock-AF_PPPOX" , "clock-AF_WANPIPE" , "clock-AF_LLC" , |
b4942af6 | 252 | "clock-27" , "clock-28" , "clock-AF_CAN" , |
e51f802b | 253 | "clock-AF_TIPC" , "clock-AF_BLUETOOTH", "clock-AF_IUCV" , |
bce7b154 | 254 | "clock-AF_RXRPC" , "clock-AF_ISDN" , "clock-AF_PHONET" , |
6f107b58 | 255 | "clock-AF_IEEE802154", "clock-AF_CAIF" , "clock-AF_ALG" , |
456db6a4 | 256 | "clock-AF_NFC" , "clock-AF_VSOCK" , "clock-AF_MAX" |
443aef0e | 257 | }; |
da21f24d IM |
258 | |
259 | /* | |
260 | * sk_callback_lock locking rules are per-address-family, | |
261 | * so split the lock classes by using a per-AF key: | |
262 | */ | |
263 | static struct lock_class_key af_callback_keys[AF_MAX]; | |
264 | ||
1da177e4 LT |
265 | /* Take into consideration the size of the struct sk_buff overhead in the |
266 | * determination of these values, since that is non-constant across | |
267 | * platforms. This makes socket queueing behavior and performance | |
268 | * not depend upon such differences. | |
269 | */ | |
270 | #define _SK_MEM_PACKETS 256 | |
87fb4b7b | 271 | #define _SK_MEM_OVERHEAD SKB_TRUESIZE(256) |
1da177e4 LT |
272 | #define SK_WMEM_MAX (_SK_MEM_OVERHEAD * _SK_MEM_PACKETS) |
273 | #define SK_RMEM_MAX (_SK_MEM_OVERHEAD * _SK_MEM_PACKETS) | |
274 | ||
275 | /* Run time adjustable parameters. */ | |
ab32ea5d | 276 | __u32 sysctl_wmem_max __read_mostly = SK_WMEM_MAX; |
6d8ebc8a | 277 | EXPORT_SYMBOL(sysctl_wmem_max); |
ab32ea5d | 278 | __u32 sysctl_rmem_max __read_mostly = SK_RMEM_MAX; |
6d8ebc8a | 279 | EXPORT_SYMBOL(sysctl_rmem_max); |
ab32ea5d BH |
280 | __u32 sysctl_wmem_default __read_mostly = SK_WMEM_MAX; |
281 | __u32 sysctl_rmem_default __read_mostly = SK_RMEM_MAX; | |
1da177e4 | 282 | |
25985edc | 283 | /* Maximal space eaten by iovec or ancillary data plus some space */ |
ab32ea5d | 284 | int sysctl_optmem_max __read_mostly = sizeof(unsigned long)*(2*UIO_MAXIOV+512); |
2a91525c | 285 | EXPORT_SYMBOL(sysctl_optmem_max); |
1da177e4 | 286 | |
b245be1f WB |
287 | int sysctl_tstamp_allow_data __read_mostly = 1; |
288 | ||
c93bdd0e MG |
289 | struct static_key memalloc_socks = STATIC_KEY_INIT_FALSE; |
290 | EXPORT_SYMBOL_GPL(memalloc_socks); | |
291 | ||
7cb02404 MG |
292 | /** |
293 | * sk_set_memalloc - sets %SOCK_MEMALLOC | |
294 | * @sk: socket to set it on | |
295 | * | |
296 | * Set %SOCK_MEMALLOC on a socket for access to emergency reserves. | |
297 | * It's the responsibility of the admin to adjust min_free_kbytes | |
298 | * to meet the requirements | |
299 | */ | |
300 | void sk_set_memalloc(struct sock *sk) | |
301 | { | |
302 | sock_set_flag(sk, SOCK_MEMALLOC); | |
303 | sk->sk_allocation |= __GFP_MEMALLOC; | |
c93bdd0e | 304 | static_key_slow_inc(&memalloc_socks); |
7cb02404 MG |
305 | } |
306 | EXPORT_SYMBOL_GPL(sk_set_memalloc); | |
307 | ||
308 | void sk_clear_memalloc(struct sock *sk) | |
309 | { | |
310 | sock_reset_flag(sk, SOCK_MEMALLOC); | |
311 | sk->sk_allocation &= ~__GFP_MEMALLOC; | |
c93bdd0e | 312 | static_key_slow_dec(&memalloc_socks); |
c76562b6 MG |
313 | |
314 | /* | |
315 | * SOCK_MEMALLOC is allowed to ignore rmem limits to ensure forward | |
5d753610 MG |
316 | * progress of swapping. SOCK_MEMALLOC may be cleared while |
317 | * it has rmem allocations due to the last swapfile being deactivated | |
318 | * but there is a risk that the socket is unusable due to exceeding | |
319 | * the rmem limits. Reclaim the reserves and obey rmem limits again. | |
c76562b6 | 320 | */ |
5d753610 | 321 | sk_mem_reclaim(sk); |
7cb02404 MG |
322 | } |
323 | EXPORT_SYMBOL_GPL(sk_clear_memalloc); | |
324 | ||
b4b9e355 MG |
325 | int __sk_backlog_rcv(struct sock *sk, struct sk_buff *skb) |
326 | { | |
327 | int ret; | |
328 | unsigned long pflags = current->flags; | |
329 | ||
330 | /* these should have been dropped before queueing */ | |
331 | BUG_ON(!sock_flag(sk, SOCK_MEMALLOC)); | |
332 | ||
333 | current->flags |= PF_MEMALLOC; | |
334 | ret = sk->sk_backlog_rcv(sk, skb); | |
335 | tsk_restore_flags(current, pflags, PF_MEMALLOC); | |
336 | ||
337 | return ret; | |
338 | } | |
339 | EXPORT_SYMBOL(__sk_backlog_rcv); | |
340 | ||
1da177e4 LT |
341 | static int sock_set_timeout(long *timeo_p, char __user *optval, int optlen) |
342 | { | |
343 | struct timeval tv; | |
344 | ||
345 | if (optlen < sizeof(tv)) | |
346 | return -EINVAL; | |
347 | if (copy_from_user(&tv, optval, sizeof(tv))) | |
348 | return -EFAULT; | |
ba78073e VA |
349 | if (tv.tv_usec < 0 || tv.tv_usec >= USEC_PER_SEC) |
350 | return -EDOM; | |
1da177e4 | 351 | |
ba78073e | 352 | if (tv.tv_sec < 0) { |
6f11df83 AM |
353 | static int warned __read_mostly; |
354 | ||
ba78073e | 355 | *timeo_p = 0; |
50aab54f | 356 | if (warned < 10 && net_ratelimit()) { |
ba78073e | 357 | warned++; |
e005d193 JP |
358 | pr_info("%s: `%s' (pid %d) tries to set negative timeout\n", |
359 | __func__, current->comm, task_pid_nr(current)); | |
50aab54f | 360 | } |
ba78073e VA |
361 | return 0; |
362 | } | |
1da177e4 LT |
363 | *timeo_p = MAX_SCHEDULE_TIMEOUT; |
364 | if (tv.tv_sec == 0 && tv.tv_usec == 0) | |
365 | return 0; | |
366 | if (tv.tv_sec < (MAX_SCHEDULE_TIMEOUT/HZ - 1)) | |
367 | *timeo_p = tv.tv_sec*HZ + (tv.tv_usec+(1000000/HZ-1))/(1000000/HZ); | |
368 | return 0; | |
369 | } | |
370 | ||
371 | static void sock_warn_obsolete_bsdism(const char *name) | |
372 | { | |
373 | static int warned; | |
374 | static char warncomm[TASK_COMM_LEN]; | |
4ec93edb YH |
375 | if (strcmp(warncomm, current->comm) && warned < 5) { |
376 | strcpy(warncomm, current->comm); | |
e005d193 JP |
377 | pr_warn("process `%s' is using obsolete %s SO_BSDCOMPAT\n", |
378 | warncomm, name); | |
1da177e4 LT |
379 | warned++; |
380 | } | |
381 | } | |
382 | ||
080a270f HFS |
383 | static bool sock_needs_netstamp(const struct sock *sk) |
384 | { | |
385 | switch (sk->sk_family) { | |
386 | case AF_UNSPEC: | |
387 | case AF_UNIX: | |
388 | return false; | |
389 | default: | |
390 | return true; | |
391 | } | |
392 | } | |
393 | ||
08e29af3 | 394 | static void sock_disable_timestamp(struct sock *sk, unsigned long flags) |
4ec93edb | 395 | { |
08e29af3 ED |
396 | if (sk->sk_flags & flags) { |
397 | sk->sk_flags &= ~flags; | |
080a270f HFS |
398 | if (sock_needs_netstamp(sk) && |
399 | !(sk->sk_flags & SK_FLAGS_TIMESTAMP)) | |
20d49473 | 400 | net_disable_timestamp(); |
1da177e4 LT |
401 | } |
402 | } | |
403 | ||
404 | ||
f0088a50 DV |
405 | int sock_queue_rcv_skb(struct sock *sk, struct sk_buff *skb) |
406 | { | |
766e9037 | 407 | int err; |
3b885787 NH |
408 | unsigned long flags; |
409 | struct sk_buff_head *list = &sk->sk_receive_queue; | |
f0088a50 | 410 | |
0fd7bac6 | 411 | if (atomic_read(&sk->sk_rmem_alloc) >= sk->sk_rcvbuf) { |
766e9037 | 412 | atomic_inc(&sk->sk_drops); |
3847ce32 | 413 | trace_sock_rcvqueue_full(sk, skb); |
766e9037 | 414 | return -ENOMEM; |
f0088a50 DV |
415 | } |
416 | ||
fda9ef5d | 417 | err = sk_filter(sk, skb); |
f0088a50 | 418 | if (err) |
766e9037 | 419 | return err; |
f0088a50 | 420 | |
c76562b6 | 421 | if (!sk_rmem_schedule(sk, skb, skb->truesize)) { |
766e9037 ED |
422 | atomic_inc(&sk->sk_drops); |
423 | return -ENOBUFS; | |
3ab224be HA |
424 | } |
425 | ||
f0088a50 DV |
426 | skb->dev = NULL; |
427 | skb_set_owner_r(skb, sk); | |
49ad9599 | 428 | |
7fee226a ED |
429 | /* we escape from rcu protected region, make sure we dont leak |
430 | * a norefcounted dst | |
431 | */ | |
432 | skb_dst_force(skb); | |
433 | ||
3b885787 | 434 | spin_lock_irqsave(&list->lock, flags); |
3bc3b96f | 435 | sock_skb_set_dropcount(sk, skb); |
3b885787 NH |
436 | __skb_queue_tail(list, skb); |
437 | spin_unlock_irqrestore(&list->lock, flags); | |
f0088a50 DV |
438 | |
439 | if (!sock_flag(sk, SOCK_DEAD)) | |
676d2369 | 440 | sk->sk_data_ready(sk); |
766e9037 | 441 | return 0; |
f0088a50 DV |
442 | } |
443 | EXPORT_SYMBOL(sock_queue_rcv_skb); | |
444 | ||
58a5a7b9 | 445 | int sk_receive_skb(struct sock *sk, struct sk_buff *skb, const int nested) |
f0088a50 DV |
446 | { |
447 | int rc = NET_RX_SUCCESS; | |
448 | ||
fda9ef5d | 449 | if (sk_filter(sk, skb)) |
f0088a50 DV |
450 | goto discard_and_relse; |
451 | ||
452 | skb->dev = NULL; | |
453 | ||
274f482d | 454 | if (sk_rcvqueues_full(sk, sk->sk_rcvbuf)) { |
c377411f ED |
455 | atomic_inc(&sk->sk_drops); |
456 | goto discard_and_relse; | |
457 | } | |
58a5a7b9 ACM |
458 | if (nested) |
459 | bh_lock_sock_nested(sk); | |
460 | else | |
461 | bh_lock_sock(sk); | |
a5b5bb9a IM |
462 | if (!sock_owned_by_user(sk)) { |
463 | /* | |
464 | * trylock + unlock semantics: | |
465 | */ | |
466 | mutex_acquire(&sk->sk_lock.dep_map, 0, 1, _RET_IP_); | |
467 | ||
c57943a1 | 468 | rc = sk_backlog_rcv(sk, skb); |
a5b5bb9a IM |
469 | |
470 | mutex_release(&sk->sk_lock.dep_map, 1, _RET_IP_); | |
f545a38f | 471 | } else if (sk_add_backlog(sk, skb, sk->sk_rcvbuf)) { |
8eae939f ZY |
472 | bh_unlock_sock(sk); |
473 | atomic_inc(&sk->sk_drops); | |
474 | goto discard_and_relse; | |
475 | } | |
476 | ||
f0088a50 DV |
477 | bh_unlock_sock(sk); |
478 | out: | |
479 | sock_put(sk); | |
480 | return rc; | |
481 | discard_and_relse: | |
482 | kfree_skb(skb); | |
483 | goto out; | |
484 | } | |
485 | EXPORT_SYMBOL(sk_receive_skb); | |
486 | ||
487 | struct dst_entry *__sk_dst_check(struct sock *sk, u32 cookie) | |
488 | { | |
b6c6712a | 489 | struct dst_entry *dst = __sk_dst_get(sk); |
f0088a50 DV |
490 | |
491 | if (dst && dst->obsolete && dst->ops->check(dst, cookie) == NULL) { | |
e022f0b4 | 492 | sk_tx_queue_clear(sk); |
a9b3cd7f | 493 | RCU_INIT_POINTER(sk->sk_dst_cache, NULL); |
f0088a50 DV |
494 | dst_release(dst); |
495 | return NULL; | |
496 | } | |
497 | ||
498 | return dst; | |
499 | } | |
500 | EXPORT_SYMBOL(__sk_dst_check); | |
501 | ||
502 | struct dst_entry *sk_dst_check(struct sock *sk, u32 cookie) | |
503 | { | |
504 | struct dst_entry *dst = sk_dst_get(sk); | |
505 | ||
506 | if (dst && dst->obsolete && dst->ops->check(dst, cookie) == NULL) { | |
507 | sk_dst_reset(sk); | |
508 | dst_release(dst); | |
509 | return NULL; | |
510 | } | |
511 | ||
512 | return dst; | |
513 | } | |
514 | EXPORT_SYMBOL(sk_dst_check); | |
515 | ||
c91f6df2 BH |
516 | static int sock_setbindtodevice(struct sock *sk, char __user *optval, |
517 | int optlen) | |
4878809f DM |
518 | { |
519 | int ret = -ENOPROTOOPT; | |
520 | #ifdef CONFIG_NETDEVICES | |
3b1e0a65 | 521 | struct net *net = sock_net(sk); |
4878809f DM |
522 | char devname[IFNAMSIZ]; |
523 | int index; | |
524 | ||
525 | /* Sorry... */ | |
526 | ret = -EPERM; | |
5e1fccc0 | 527 | if (!ns_capable(net->user_ns, CAP_NET_RAW)) |
4878809f DM |
528 | goto out; |
529 | ||
530 | ret = -EINVAL; | |
531 | if (optlen < 0) | |
532 | goto out; | |
533 | ||
534 | /* Bind this socket to a particular device like "eth0", | |
535 | * as specified in the passed interface name. If the | |
536 | * name is "" or the option length is zero the socket | |
537 | * is not bound. | |
538 | */ | |
539 | if (optlen > IFNAMSIZ - 1) | |
540 | optlen = IFNAMSIZ - 1; | |
541 | memset(devname, 0, sizeof(devname)); | |
542 | ||
543 | ret = -EFAULT; | |
544 | if (copy_from_user(devname, optval, optlen)) | |
545 | goto out; | |
546 | ||
000ba2e4 DM |
547 | index = 0; |
548 | if (devname[0] != '\0') { | |
bf8e56bf | 549 | struct net_device *dev; |
4878809f | 550 | |
bf8e56bf ED |
551 | rcu_read_lock(); |
552 | dev = dev_get_by_name_rcu(net, devname); | |
553 | if (dev) | |
554 | index = dev->ifindex; | |
555 | rcu_read_unlock(); | |
4878809f DM |
556 | ret = -ENODEV; |
557 | if (!dev) | |
558 | goto out; | |
4878809f DM |
559 | } |
560 | ||
561 | lock_sock(sk); | |
562 | sk->sk_bound_dev_if = index; | |
563 | sk_dst_reset(sk); | |
564 | release_sock(sk); | |
565 | ||
566 | ret = 0; | |
567 | ||
568 | out: | |
569 | #endif | |
570 | ||
571 | return ret; | |
572 | } | |
573 | ||
c91f6df2 BH |
574 | static int sock_getbindtodevice(struct sock *sk, char __user *optval, |
575 | int __user *optlen, int len) | |
576 | { | |
577 | int ret = -ENOPROTOOPT; | |
578 | #ifdef CONFIG_NETDEVICES | |
579 | struct net *net = sock_net(sk); | |
c91f6df2 | 580 | char devname[IFNAMSIZ]; |
c91f6df2 BH |
581 | |
582 | if (sk->sk_bound_dev_if == 0) { | |
583 | len = 0; | |
584 | goto zero; | |
585 | } | |
586 | ||
587 | ret = -EINVAL; | |
588 | if (len < IFNAMSIZ) | |
589 | goto out; | |
590 | ||
5dbe7c17 NS |
591 | ret = netdev_get_name(net, devname, sk->sk_bound_dev_if); |
592 | if (ret) | |
c91f6df2 | 593 | goto out; |
c91f6df2 BH |
594 | |
595 | len = strlen(devname) + 1; | |
596 | ||
597 | ret = -EFAULT; | |
598 | if (copy_to_user(optval, devname, len)) | |
599 | goto out; | |
600 | ||
601 | zero: | |
602 | ret = -EFAULT; | |
603 | if (put_user(len, optlen)) | |
604 | goto out; | |
605 | ||
606 | ret = 0; | |
607 | ||
608 | out: | |
609 | #endif | |
610 | ||
611 | return ret; | |
612 | } | |
613 | ||
c0ef877b PE |
614 | static inline void sock_valbool_flag(struct sock *sk, int bit, int valbool) |
615 | { | |
616 | if (valbool) | |
617 | sock_set_flag(sk, bit); | |
618 | else | |
619 | sock_reset_flag(sk, bit); | |
620 | } | |
621 | ||
f60e5990 | 622 | bool sk_mc_loop(struct sock *sk) |
623 | { | |
624 | if (dev_recursion_level()) | |
625 | return false; | |
626 | if (!sk) | |
627 | return true; | |
628 | switch (sk->sk_family) { | |
629 | case AF_INET: | |
630 | return inet_sk(sk)->mc_loop; | |
631 | #if IS_ENABLED(CONFIG_IPV6) | |
632 | case AF_INET6: | |
633 | return inet6_sk(sk)->mc_loop; | |
634 | #endif | |
635 | } | |
636 | WARN_ON(1); | |
637 | return true; | |
638 | } | |
639 | EXPORT_SYMBOL(sk_mc_loop); | |
640 | ||
1da177e4 LT |
641 | /* |
642 | * This is meant for all protocols to use and covers goings on | |
643 | * at the socket level. Everything here is generic. | |
644 | */ | |
645 | ||
646 | int sock_setsockopt(struct socket *sock, int level, int optname, | |
b7058842 | 647 | char __user *optval, unsigned int optlen) |
1da177e4 | 648 | { |
2a91525c | 649 | struct sock *sk = sock->sk; |
1da177e4 LT |
650 | int val; |
651 | int valbool; | |
652 | struct linger ling; | |
653 | int ret = 0; | |
4ec93edb | 654 | |
1da177e4 LT |
655 | /* |
656 | * Options without arguments | |
657 | */ | |
658 | ||
4878809f | 659 | if (optname == SO_BINDTODEVICE) |
c91f6df2 | 660 | return sock_setbindtodevice(sk, optval, optlen); |
4878809f | 661 | |
e71a4783 SH |
662 | if (optlen < sizeof(int)) |
663 | return -EINVAL; | |
4ec93edb | 664 | |
1da177e4 LT |
665 | if (get_user(val, (int __user *)optval)) |
666 | return -EFAULT; | |
4ec93edb | 667 | |
2a91525c | 668 | valbool = val ? 1 : 0; |
1da177e4 LT |
669 | |
670 | lock_sock(sk); | |
671 | ||
2a91525c | 672 | switch (optname) { |
e71a4783 | 673 | case SO_DEBUG: |
2a91525c | 674 | if (val && !capable(CAP_NET_ADMIN)) |
e71a4783 | 675 | ret = -EACCES; |
2a91525c | 676 | else |
c0ef877b | 677 | sock_valbool_flag(sk, SOCK_DBG, valbool); |
e71a4783 SH |
678 | break; |
679 | case SO_REUSEADDR: | |
4a17fd52 | 680 | sk->sk_reuse = (valbool ? SK_CAN_REUSE : SK_NO_REUSE); |
e71a4783 | 681 | break; |
055dc21a TH |
682 | case SO_REUSEPORT: |
683 | sk->sk_reuseport = valbool; | |
684 | break; | |
e71a4783 | 685 | case SO_TYPE: |
49c794e9 | 686 | case SO_PROTOCOL: |
0d6038ee | 687 | case SO_DOMAIN: |
e71a4783 SH |
688 | case SO_ERROR: |
689 | ret = -ENOPROTOOPT; | |
690 | break; | |
691 | case SO_DONTROUTE: | |
c0ef877b | 692 | sock_valbool_flag(sk, SOCK_LOCALROUTE, valbool); |
e71a4783 SH |
693 | break; |
694 | case SO_BROADCAST: | |
695 | sock_valbool_flag(sk, SOCK_BROADCAST, valbool); | |
696 | break; | |
697 | case SO_SNDBUF: | |
698 | /* Don't error on this BSD doesn't and if you think | |
82981930 ED |
699 | * about it this is right. Otherwise apps have to |
700 | * play 'guess the biggest size' games. RCVBUF/SNDBUF | |
701 | * are treated in BSD as hints | |
702 | */ | |
703 | val = min_t(u32, val, sysctl_wmem_max); | |
b0573dea | 704 | set_sndbuf: |
e71a4783 | 705 | sk->sk_userlocks |= SOCK_SNDBUF_LOCK; |
82981930 ED |
706 | sk->sk_sndbuf = max_t(u32, val * 2, SOCK_MIN_SNDBUF); |
707 | /* Wake up sending tasks if we upped the value. */ | |
e71a4783 SH |
708 | sk->sk_write_space(sk); |
709 | break; | |
1da177e4 | 710 | |
e71a4783 SH |
711 | case SO_SNDBUFFORCE: |
712 | if (!capable(CAP_NET_ADMIN)) { | |
713 | ret = -EPERM; | |
714 | break; | |
715 | } | |
716 | goto set_sndbuf; | |
b0573dea | 717 | |
e71a4783 SH |
718 | case SO_RCVBUF: |
719 | /* Don't error on this BSD doesn't and if you think | |
82981930 ED |
720 | * about it this is right. Otherwise apps have to |
721 | * play 'guess the biggest size' games. RCVBUF/SNDBUF | |
722 | * are treated in BSD as hints | |
723 | */ | |
724 | val = min_t(u32, val, sysctl_rmem_max); | |
b0573dea | 725 | set_rcvbuf: |
e71a4783 SH |
726 | sk->sk_userlocks |= SOCK_RCVBUF_LOCK; |
727 | /* | |
728 | * We double it on the way in to account for | |
729 | * "struct sk_buff" etc. overhead. Applications | |
730 | * assume that the SO_RCVBUF setting they make will | |
731 | * allow that much actual data to be received on that | |
732 | * socket. | |
733 | * | |
734 | * Applications are unaware that "struct sk_buff" and | |
735 | * other overheads allocate from the receive buffer | |
736 | * during socket buffer allocation. | |
737 | * | |
738 | * And after considering the possible alternatives, | |
739 | * returning the value we actually used in getsockopt | |
740 | * is the most desirable behavior. | |
741 | */ | |
82981930 | 742 | sk->sk_rcvbuf = max_t(u32, val * 2, SOCK_MIN_RCVBUF); |
e71a4783 SH |
743 | break; |
744 | ||
745 | case SO_RCVBUFFORCE: | |
746 | if (!capable(CAP_NET_ADMIN)) { | |
747 | ret = -EPERM; | |
1da177e4 | 748 | break; |
e71a4783 SH |
749 | } |
750 | goto set_rcvbuf; | |
1da177e4 | 751 | |
e71a4783 | 752 | case SO_KEEPALIVE: |
1da177e4 | 753 | #ifdef CONFIG_INET |
3e10986d ED |
754 | if (sk->sk_protocol == IPPROTO_TCP && |
755 | sk->sk_type == SOCK_STREAM) | |
e71a4783 | 756 | tcp_set_keepalive(sk, valbool); |
1da177e4 | 757 | #endif |
e71a4783 SH |
758 | sock_valbool_flag(sk, SOCK_KEEPOPEN, valbool); |
759 | break; | |
760 | ||
761 | case SO_OOBINLINE: | |
762 | sock_valbool_flag(sk, SOCK_URGINLINE, valbool); | |
763 | break; | |
764 | ||
765 | case SO_NO_CHECK: | |
28448b80 | 766 | sk->sk_no_check_tx = valbool; |
e71a4783 SH |
767 | break; |
768 | ||
769 | case SO_PRIORITY: | |
5e1fccc0 EB |
770 | if ((val >= 0 && val <= 6) || |
771 | ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN)) | |
e71a4783 SH |
772 | sk->sk_priority = val; |
773 | else | |
774 | ret = -EPERM; | |
775 | break; | |
776 | ||
777 | case SO_LINGER: | |
778 | if (optlen < sizeof(ling)) { | |
779 | ret = -EINVAL; /* 1003.1g */ | |
1da177e4 | 780 | break; |
e71a4783 | 781 | } |
2a91525c | 782 | if (copy_from_user(&ling, optval, sizeof(ling))) { |
e71a4783 | 783 | ret = -EFAULT; |
1da177e4 | 784 | break; |
e71a4783 SH |
785 | } |
786 | if (!ling.l_onoff) | |
787 | sock_reset_flag(sk, SOCK_LINGER); | |
788 | else { | |
1da177e4 | 789 | #if (BITS_PER_LONG == 32) |
e71a4783 SH |
790 | if ((unsigned int)ling.l_linger >= MAX_SCHEDULE_TIMEOUT/HZ) |
791 | sk->sk_lingertime = MAX_SCHEDULE_TIMEOUT; | |
1da177e4 | 792 | else |
e71a4783 SH |
793 | #endif |
794 | sk->sk_lingertime = (unsigned int)ling.l_linger * HZ; | |
795 | sock_set_flag(sk, SOCK_LINGER); | |
796 | } | |
797 | break; | |
798 | ||
799 | case SO_BSDCOMPAT: | |
800 | sock_warn_obsolete_bsdism("setsockopt"); | |
801 | break; | |
802 | ||
803 | case SO_PASSCRED: | |
804 | if (valbool) | |
805 | set_bit(SOCK_PASSCRED, &sock->flags); | |
806 | else | |
807 | clear_bit(SOCK_PASSCRED, &sock->flags); | |
808 | break; | |
809 | ||
810 | case SO_TIMESTAMP: | |
92f37fd2 | 811 | case SO_TIMESTAMPNS: |
e71a4783 | 812 | if (valbool) { |
92f37fd2 ED |
813 | if (optname == SO_TIMESTAMP) |
814 | sock_reset_flag(sk, SOCK_RCVTSTAMPNS); | |
815 | else | |
816 | sock_set_flag(sk, SOCK_RCVTSTAMPNS); | |
e71a4783 | 817 | sock_set_flag(sk, SOCK_RCVTSTAMP); |
20d49473 | 818 | sock_enable_timestamp(sk, SOCK_TIMESTAMP); |
92f37fd2 | 819 | } else { |
e71a4783 | 820 | sock_reset_flag(sk, SOCK_RCVTSTAMP); |
92f37fd2 ED |
821 | sock_reset_flag(sk, SOCK_RCVTSTAMPNS); |
822 | } | |
e71a4783 SH |
823 | break; |
824 | ||
20d49473 PO |
825 | case SO_TIMESTAMPING: |
826 | if (val & ~SOF_TIMESTAMPING_MASK) { | |
f249fb78 | 827 | ret = -EINVAL; |
20d49473 PO |
828 | break; |
829 | } | |
b245be1f | 830 | |
09c2d251 | 831 | if (val & SOF_TIMESTAMPING_OPT_ID && |
4ed2d765 | 832 | !(sk->sk_tsflags & SOF_TIMESTAMPING_OPT_ID)) { |
ac5cc977 WC |
833 | if (sk->sk_protocol == IPPROTO_TCP && |
834 | sk->sk_type == SOCK_STREAM) { | |
4ed2d765 WB |
835 | if (sk->sk_state != TCP_ESTABLISHED) { |
836 | ret = -EINVAL; | |
837 | break; | |
838 | } | |
839 | sk->sk_tskey = tcp_sk(sk)->snd_una; | |
840 | } else { | |
841 | sk->sk_tskey = 0; | |
842 | } | |
843 | } | |
b9f40e21 | 844 | sk->sk_tsflags = val; |
20d49473 PO |
845 | if (val & SOF_TIMESTAMPING_RX_SOFTWARE) |
846 | sock_enable_timestamp(sk, | |
847 | SOCK_TIMESTAMPING_RX_SOFTWARE); | |
848 | else | |
849 | sock_disable_timestamp(sk, | |
08e29af3 | 850 | (1UL << SOCK_TIMESTAMPING_RX_SOFTWARE)); |
20d49473 PO |
851 | break; |
852 | ||
e71a4783 SH |
853 | case SO_RCVLOWAT: |
854 | if (val < 0) | |
855 | val = INT_MAX; | |
856 | sk->sk_rcvlowat = val ? : 1; | |
857 | break; | |
858 | ||
859 | case SO_RCVTIMEO: | |
860 | ret = sock_set_timeout(&sk->sk_rcvtimeo, optval, optlen); | |
861 | break; | |
862 | ||
863 | case SO_SNDTIMEO: | |
864 | ret = sock_set_timeout(&sk->sk_sndtimeo, optval, optlen); | |
865 | break; | |
1da177e4 | 866 | |
e71a4783 SH |
867 | case SO_ATTACH_FILTER: |
868 | ret = -EINVAL; | |
869 | if (optlen == sizeof(struct sock_fprog)) { | |
870 | struct sock_fprog fprog; | |
1da177e4 | 871 | |
e71a4783 SH |
872 | ret = -EFAULT; |
873 | if (copy_from_user(&fprog, optval, sizeof(fprog))) | |
1da177e4 | 874 | break; |
e71a4783 SH |
875 | |
876 | ret = sk_attach_filter(&fprog, sk); | |
877 | } | |
878 | break; | |
879 | ||
89aa0758 AS |
880 | case SO_ATTACH_BPF: |
881 | ret = -EINVAL; | |
882 | if (optlen == sizeof(u32)) { | |
883 | u32 ufd; | |
884 | ||
885 | ret = -EFAULT; | |
886 | if (copy_from_user(&ufd, optval, sizeof(ufd))) | |
887 | break; | |
888 | ||
889 | ret = sk_attach_bpf(ufd, sk); | |
890 | } | |
891 | break; | |
892 | ||
538950a1 CG |
893 | case SO_ATTACH_REUSEPORT_CBPF: |
894 | ret = -EINVAL; | |
895 | if (optlen == sizeof(struct sock_fprog)) { | |
896 | struct sock_fprog fprog; | |
897 | ||
898 | ret = -EFAULT; | |
899 | if (copy_from_user(&fprog, optval, sizeof(fprog))) | |
900 | break; | |
901 | ||
902 | ret = sk_reuseport_attach_filter(&fprog, sk); | |
903 | } | |
904 | break; | |
905 | ||
906 | case SO_ATTACH_REUSEPORT_EBPF: | |
907 | ret = -EINVAL; | |
908 | if (optlen == sizeof(u32)) { | |
909 | u32 ufd; | |
910 | ||
911 | ret = -EFAULT; | |
912 | if (copy_from_user(&ufd, optval, sizeof(ufd))) | |
913 | break; | |
914 | ||
915 | ret = sk_reuseport_attach_bpf(ufd, sk); | |
916 | } | |
917 | break; | |
918 | ||
e71a4783 | 919 | case SO_DETACH_FILTER: |
55b33325 | 920 | ret = sk_detach_filter(sk); |
e71a4783 | 921 | break; |
1da177e4 | 922 | |
d59577b6 VB |
923 | case SO_LOCK_FILTER: |
924 | if (sock_flag(sk, SOCK_FILTER_LOCKED) && !valbool) | |
925 | ret = -EPERM; | |
926 | else | |
927 | sock_valbool_flag(sk, SOCK_FILTER_LOCKED, valbool); | |
928 | break; | |
929 | ||
e71a4783 SH |
930 | case SO_PASSSEC: |
931 | if (valbool) | |
932 | set_bit(SOCK_PASSSEC, &sock->flags); | |
933 | else | |
934 | clear_bit(SOCK_PASSSEC, &sock->flags); | |
935 | break; | |
4a19ec58 | 936 | case SO_MARK: |
5e1fccc0 | 937 | if (!ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN)) |
4a19ec58 | 938 | ret = -EPERM; |
2a91525c | 939 | else |
4a19ec58 | 940 | sk->sk_mark = val; |
4a19ec58 | 941 | break; |
877ce7c1 | 942 | |
3b885787 | 943 | case SO_RXQ_OVFL: |
8083f0fc | 944 | sock_valbool_flag(sk, SOCK_RXQ_OVFL, valbool); |
3b885787 | 945 | break; |
6e3e939f JB |
946 | |
947 | case SO_WIFI_STATUS: | |
948 | sock_valbool_flag(sk, SOCK_WIFI_STATUS, valbool); | |
949 | break; | |
950 | ||
ef64a54f PE |
951 | case SO_PEEK_OFF: |
952 | if (sock->ops->set_peek_off) | |
12663bfc | 953 | ret = sock->ops->set_peek_off(sk, val); |
ef64a54f PE |
954 | else |
955 | ret = -EOPNOTSUPP; | |
956 | break; | |
3bdc0eba BG |
957 | |
958 | case SO_NOFCS: | |
959 | sock_valbool_flag(sk, SOCK_NOFCS, valbool); | |
960 | break; | |
961 | ||
7d4c04fc KJ |
962 | case SO_SELECT_ERR_QUEUE: |
963 | sock_valbool_flag(sk, SOCK_SELECT_ERR_QUEUE, valbool); | |
964 | break; | |
965 | ||
e0d1095a | 966 | #ifdef CONFIG_NET_RX_BUSY_POLL |
64b0dc51 | 967 | case SO_BUSY_POLL: |
dafcc438 ET |
968 | /* allow unprivileged users to decrease the value */ |
969 | if ((val > sk->sk_ll_usec) && !capable(CAP_NET_ADMIN)) | |
970 | ret = -EPERM; | |
971 | else { | |
972 | if (val < 0) | |
973 | ret = -EINVAL; | |
974 | else | |
975 | sk->sk_ll_usec = val; | |
976 | } | |
977 | break; | |
978 | #endif | |
62748f32 ED |
979 | |
980 | case SO_MAX_PACING_RATE: | |
981 | sk->sk_max_pacing_rate = val; | |
982 | sk->sk_pacing_rate = min(sk->sk_pacing_rate, | |
983 | sk->sk_max_pacing_rate); | |
984 | break; | |
985 | ||
70da268b ED |
986 | case SO_INCOMING_CPU: |
987 | sk->sk_incoming_cpu = val; | |
988 | break; | |
989 | ||
e71a4783 SH |
990 | default: |
991 | ret = -ENOPROTOOPT; | |
992 | break; | |
4ec93edb | 993 | } |
1da177e4 LT |
994 | release_sock(sk); |
995 | return ret; | |
996 | } | |
2a91525c | 997 | EXPORT_SYMBOL(sock_setsockopt); |
1da177e4 LT |
998 | |
999 | ||
8f09898b | 1000 | static void cred_to_ucred(struct pid *pid, const struct cred *cred, |
1001 | struct ucred *ucred) | |
3f551f94 EB |
1002 | { |
1003 | ucred->pid = pid_vnr(pid); | |
1004 | ucred->uid = ucred->gid = -1; | |
1005 | if (cred) { | |
1006 | struct user_namespace *current_ns = current_user_ns(); | |
1007 | ||
b2e4f544 EB |
1008 | ucred->uid = from_kuid_munged(current_ns, cred->euid); |
1009 | ucred->gid = from_kgid_munged(current_ns, cred->egid); | |
3f551f94 EB |
1010 | } |
1011 | } | |
1012 | ||
1da177e4 LT |
1013 | int sock_getsockopt(struct socket *sock, int level, int optname, |
1014 | char __user *optval, int __user *optlen) | |
1015 | { | |
1016 | struct sock *sk = sock->sk; | |
4ec93edb | 1017 | |
e71a4783 | 1018 | union { |
4ec93edb YH |
1019 | int val; |
1020 | struct linger ling; | |
1da177e4 LT |
1021 | struct timeval tm; |
1022 | } v; | |
4ec93edb | 1023 | |
4d0392be | 1024 | int lv = sizeof(int); |
1da177e4 | 1025 | int len; |
4ec93edb | 1026 | |
e71a4783 | 1027 | if (get_user(len, optlen)) |
4ec93edb | 1028 | return -EFAULT; |
e71a4783 | 1029 | if (len < 0) |
1da177e4 | 1030 | return -EINVAL; |
4ec93edb | 1031 | |
50fee1de | 1032 | memset(&v, 0, sizeof(v)); |
df0bca04 | 1033 | |
2a91525c | 1034 | switch (optname) { |
e71a4783 SH |
1035 | case SO_DEBUG: |
1036 | v.val = sock_flag(sk, SOCK_DBG); | |
1037 | break; | |
1038 | ||
1039 | case SO_DONTROUTE: | |
1040 | v.val = sock_flag(sk, SOCK_LOCALROUTE); | |
1041 | break; | |
1042 | ||
1043 | case SO_BROADCAST: | |
1b23a5df | 1044 | v.val = sock_flag(sk, SOCK_BROADCAST); |
e71a4783 SH |
1045 | break; |
1046 | ||
1047 | case SO_SNDBUF: | |
1048 | v.val = sk->sk_sndbuf; | |
1049 | break; | |
1050 | ||
1051 | case SO_RCVBUF: | |
1052 | v.val = sk->sk_rcvbuf; | |
1053 | break; | |
1054 | ||
1055 | case SO_REUSEADDR: | |
1056 | v.val = sk->sk_reuse; | |
1057 | break; | |
1058 | ||
055dc21a TH |
1059 | case SO_REUSEPORT: |
1060 | v.val = sk->sk_reuseport; | |
1061 | break; | |
1062 | ||
e71a4783 | 1063 | case SO_KEEPALIVE: |
1b23a5df | 1064 | v.val = sock_flag(sk, SOCK_KEEPOPEN); |
e71a4783 SH |
1065 | break; |
1066 | ||
1067 | case SO_TYPE: | |
1068 | v.val = sk->sk_type; | |
1069 | break; | |
1070 | ||
49c794e9 JE |
1071 | case SO_PROTOCOL: |
1072 | v.val = sk->sk_protocol; | |
1073 | break; | |
1074 | ||
0d6038ee JE |
1075 | case SO_DOMAIN: |
1076 | v.val = sk->sk_family; | |
1077 | break; | |
1078 | ||
e71a4783 SH |
1079 | case SO_ERROR: |
1080 | v.val = -sock_error(sk); | |
2a91525c | 1081 | if (v.val == 0) |
e71a4783 SH |
1082 | v.val = xchg(&sk->sk_err_soft, 0); |
1083 | break; | |
1084 | ||
1085 | case SO_OOBINLINE: | |
1b23a5df | 1086 | v.val = sock_flag(sk, SOCK_URGINLINE); |
e71a4783 SH |
1087 | break; |
1088 | ||
1089 | case SO_NO_CHECK: | |
28448b80 | 1090 | v.val = sk->sk_no_check_tx; |
e71a4783 SH |
1091 | break; |
1092 | ||
1093 | case SO_PRIORITY: | |
1094 | v.val = sk->sk_priority; | |
1095 | break; | |
1096 | ||
1097 | case SO_LINGER: | |
1098 | lv = sizeof(v.ling); | |
1b23a5df | 1099 | v.ling.l_onoff = sock_flag(sk, SOCK_LINGER); |
e71a4783 SH |
1100 | v.ling.l_linger = sk->sk_lingertime / HZ; |
1101 | break; | |
1102 | ||
1103 | case SO_BSDCOMPAT: | |
1104 | sock_warn_obsolete_bsdism("getsockopt"); | |
1105 | break; | |
1106 | ||
1107 | case SO_TIMESTAMP: | |
92f37fd2 ED |
1108 | v.val = sock_flag(sk, SOCK_RCVTSTAMP) && |
1109 | !sock_flag(sk, SOCK_RCVTSTAMPNS); | |
1110 | break; | |
1111 | ||
1112 | case SO_TIMESTAMPNS: | |
1113 | v.val = sock_flag(sk, SOCK_RCVTSTAMPNS); | |
e71a4783 SH |
1114 | break; |
1115 | ||
20d49473 | 1116 | case SO_TIMESTAMPING: |
b9f40e21 | 1117 | v.val = sk->sk_tsflags; |
20d49473 PO |
1118 | break; |
1119 | ||
e71a4783 | 1120 | case SO_RCVTIMEO: |
2a91525c | 1121 | lv = sizeof(struct timeval); |
e71a4783 SH |
1122 | if (sk->sk_rcvtimeo == MAX_SCHEDULE_TIMEOUT) { |
1123 | v.tm.tv_sec = 0; | |
1124 | v.tm.tv_usec = 0; | |
1125 | } else { | |
1126 | v.tm.tv_sec = sk->sk_rcvtimeo / HZ; | |
1127 | v.tm.tv_usec = ((sk->sk_rcvtimeo % HZ) * 1000000) / HZ; | |
1128 | } | |
1129 | break; | |
1130 | ||
1131 | case SO_SNDTIMEO: | |
2a91525c | 1132 | lv = sizeof(struct timeval); |
e71a4783 SH |
1133 | if (sk->sk_sndtimeo == MAX_SCHEDULE_TIMEOUT) { |
1134 | v.tm.tv_sec = 0; | |
1135 | v.tm.tv_usec = 0; | |
1136 | } else { | |
1137 | v.tm.tv_sec = sk->sk_sndtimeo / HZ; | |
1138 | v.tm.tv_usec = ((sk->sk_sndtimeo % HZ) * 1000000) / HZ; | |
1139 | } | |
1140 | break; | |
1da177e4 | 1141 | |
e71a4783 SH |
1142 | case SO_RCVLOWAT: |
1143 | v.val = sk->sk_rcvlowat; | |
1144 | break; | |
1da177e4 | 1145 | |
e71a4783 | 1146 | case SO_SNDLOWAT: |
2a91525c | 1147 | v.val = 1; |
e71a4783 | 1148 | break; |
1da177e4 | 1149 | |
e71a4783 | 1150 | case SO_PASSCRED: |
82981930 | 1151 | v.val = !!test_bit(SOCK_PASSCRED, &sock->flags); |
e71a4783 | 1152 | break; |
1da177e4 | 1153 | |
e71a4783 | 1154 | case SO_PEERCRED: |
109f6e39 EB |
1155 | { |
1156 | struct ucred peercred; | |
1157 | if (len > sizeof(peercred)) | |
1158 | len = sizeof(peercred); | |
1159 | cred_to_ucred(sk->sk_peer_pid, sk->sk_peer_cred, &peercred); | |
1160 | if (copy_to_user(optval, &peercred, len)) | |
e71a4783 SH |
1161 | return -EFAULT; |
1162 | goto lenout; | |
109f6e39 | 1163 | } |
1da177e4 | 1164 | |
e71a4783 SH |
1165 | case SO_PEERNAME: |
1166 | { | |
1167 | char address[128]; | |
1168 | ||
1169 | if (sock->ops->getname(sock, (struct sockaddr *)address, &lv, 2)) | |
1170 | return -ENOTCONN; | |
1171 | if (lv < len) | |
1172 | return -EINVAL; | |
1173 | if (copy_to_user(optval, address, len)) | |
1174 | return -EFAULT; | |
1175 | goto lenout; | |
1176 | } | |
1da177e4 | 1177 | |
e71a4783 SH |
1178 | /* Dubious BSD thing... Probably nobody even uses it, but |
1179 | * the UNIX standard wants it for whatever reason... -DaveM | |
1180 | */ | |
1181 | case SO_ACCEPTCONN: | |
1182 | v.val = sk->sk_state == TCP_LISTEN; | |
1183 | break; | |
1da177e4 | 1184 | |
e71a4783 | 1185 | case SO_PASSSEC: |
82981930 | 1186 | v.val = !!test_bit(SOCK_PASSSEC, &sock->flags); |
e71a4783 | 1187 | break; |
877ce7c1 | 1188 | |
e71a4783 SH |
1189 | case SO_PEERSEC: |
1190 | return security_socket_getpeersec_stream(sock, optval, optlen, len); | |
1da177e4 | 1191 | |
4a19ec58 LAT |
1192 | case SO_MARK: |
1193 | v.val = sk->sk_mark; | |
1194 | break; | |
1195 | ||
3b885787 | 1196 | case SO_RXQ_OVFL: |
1b23a5df | 1197 | v.val = sock_flag(sk, SOCK_RXQ_OVFL); |
3b885787 NH |
1198 | break; |
1199 | ||
6e3e939f | 1200 | case SO_WIFI_STATUS: |
1b23a5df | 1201 | v.val = sock_flag(sk, SOCK_WIFI_STATUS); |
6e3e939f JB |
1202 | break; |
1203 | ||
ef64a54f PE |
1204 | case SO_PEEK_OFF: |
1205 | if (!sock->ops->set_peek_off) | |
1206 | return -EOPNOTSUPP; | |
1207 | ||
1208 | v.val = sk->sk_peek_off; | |
1209 | break; | |
bc2f7996 | 1210 | case SO_NOFCS: |
1b23a5df | 1211 | v.val = sock_flag(sk, SOCK_NOFCS); |
bc2f7996 | 1212 | break; |
c91f6df2 | 1213 | |
f7b86bfe | 1214 | case SO_BINDTODEVICE: |
c91f6df2 BH |
1215 | return sock_getbindtodevice(sk, optval, optlen, len); |
1216 | ||
a8fc9277 PE |
1217 | case SO_GET_FILTER: |
1218 | len = sk_get_filter(sk, (struct sock_filter __user *)optval, len); | |
1219 | if (len < 0) | |
1220 | return len; | |
1221 | ||
1222 | goto lenout; | |
c91f6df2 | 1223 | |
d59577b6 VB |
1224 | case SO_LOCK_FILTER: |
1225 | v.val = sock_flag(sk, SOCK_FILTER_LOCKED); | |
1226 | break; | |
1227 | ||
ea02f941 MS |
1228 | case SO_BPF_EXTENSIONS: |
1229 | v.val = bpf_tell_extensions(); | |
1230 | break; | |
1231 | ||
7d4c04fc KJ |
1232 | case SO_SELECT_ERR_QUEUE: |
1233 | v.val = sock_flag(sk, SOCK_SELECT_ERR_QUEUE); | |
1234 | break; | |
1235 | ||
e0d1095a | 1236 | #ifdef CONFIG_NET_RX_BUSY_POLL |
64b0dc51 | 1237 | case SO_BUSY_POLL: |
dafcc438 ET |
1238 | v.val = sk->sk_ll_usec; |
1239 | break; | |
1240 | #endif | |
1241 | ||
62748f32 ED |
1242 | case SO_MAX_PACING_RATE: |
1243 | v.val = sk->sk_max_pacing_rate; | |
1244 | break; | |
1245 | ||
2c8c56e1 ED |
1246 | case SO_INCOMING_CPU: |
1247 | v.val = sk->sk_incoming_cpu; | |
1248 | break; | |
1249 | ||
e71a4783 | 1250 | default: |
443b5991 YH |
1251 | /* We implement the SO_SNDLOWAT etc to not be settable |
1252 | * (1003.1g 7). | |
1253 | */ | |
e71a4783 | 1254 | return -ENOPROTOOPT; |
1da177e4 | 1255 | } |
e71a4783 | 1256 | |
1da177e4 LT |
1257 | if (len > lv) |
1258 | len = lv; | |
1259 | if (copy_to_user(optval, &v, len)) | |
1260 | return -EFAULT; | |
1261 | lenout: | |
4ec93edb YH |
1262 | if (put_user(len, optlen)) |
1263 | return -EFAULT; | |
1264 | return 0; | |
1da177e4 LT |
1265 | } |
1266 | ||
a5b5bb9a IM |
1267 | /* |
1268 | * Initialize an sk_lock. | |
1269 | * | |
1270 | * (We also register the sk_lock with the lock validator.) | |
1271 | */ | |
b6f99a21 | 1272 | static inline void sock_lock_init(struct sock *sk) |
a5b5bb9a | 1273 | { |
ed07536e PZ |
1274 | sock_lock_init_class_and_name(sk, |
1275 | af_family_slock_key_strings[sk->sk_family], | |
1276 | af_family_slock_keys + sk->sk_family, | |
1277 | af_family_key_strings[sk->sk_family], | |
1278 | af_family_keys + sk->sk_family); | |
a5b5bb9a IM |
1279 | } |
1280 | ||
4dc6dc71 ED |
1281 | /* |
1282 | * Copy all fields from osk to nsk but nsk->sk_refcnt must not change yet, | |
1283 | * even temporarly, because of RCU lookups. sk_node should also be left as is. | |
68835aba | 1284 | * We must not copy fields between sk_dontcopy_begin and sk_dontcopy_end |
4dc6dc71 | 1285 | */ |
f1a6c4da PE |
1286 | static void sock_copy(struct sock *nsk, const struct sock *osk) |
1287 | { | |
1288 | #ifdef CONFIG_SECURITY_NETWORK | |
1289 | void *sptr = nsk->sk_security; | |
1290 | #endif | |
68835aba ED |
1291 | memcpy(nsk, osk, offsetof(struct sock, sk_dontcopy_begin)); |
1292 | ||
1293 | memcpy(&nsk->sk_dontcopy_end, &osk->sk_dontcopy_end, | |
1294 | osk->sk_prot->obj_size - offsetof(struct sock, sk_dontcopy_end)); | |
1295 | ||
f1a6c4da PE |
1296 | #ifdef CONFIG_SECURITY_NETWORK |
1297 | nsk->sk_security = sptr; | |
1298 | security_sk_clone(osk, nsk); | |
1299 | #endif | |
1300 | } | |
1301 | ||
fcbdf09d OP |
1302 | void sk_prot_clear_portaddr_nulls(struct sock *sk, int size) |
1303 | { | |
1304 | unsigned long nulls1, nulls2; | |
1305 | ||
1306 | nulls1 = offsetof(struct sock, __sk_common.skc_node.next); | |
1307 | nulls2 = offsetof(struct sock, __sk_common.skc_portaddr_node.next); | |
1308 | if (nulls1 > nulls2) | |
1309 | swap(nulls1, nulls2); | |
1310 | ||
1311 | if (nulls1 != 0) | |
1312 | memset((char *)sk, 0, nulls1); | |
1313 | memset((char *)sk + nulls1 + sizeof(void *), 0, | |
1314 | nulls2 - nulls1 - sizeof(void *)); | |
1315 | memset((char *)sk + nulls2 + sizeof(void *), 0, | |
1316 | size - nulls2 - sizeof(void *)); | |
1317 | } | |
1318 | EXPORT_SYMBOL(sk_prot_clear_portaddr_nulls); | |
1319 | ||
2e4afe7b PE |
1320 | static struct sock *sk_prot_alloc(struct proto *prot, gfp_t priority, |
1321 | int family) | |
c308c1b2 PE |
1322 | { |
1323 | struct sock *sk; | |
1324 | struct kmem_cache *slab; | |
1325 | ||
1326 | slab = prot->slab; | |
e912b114 ED |
1327 | if (slab != NULL) { |
1328 | sk = kmem_cache_alloc(slab, priority & ~__GFP_ZERO); | |
1329 | if (!sk) | |
1330 | return sk; | |
1331 | if (priority & __GFP_ZERO) { | |
fcbdf09d OP |
1332 | if (prot->clear_sk) |
1333 | prot->clear_sk(sk, prot->obj_size); | |
1334 | else | |
1335 | sk_prot_clear_nulls(sk, prot->obj_size); | |
e912b114 | 1336 | } |
fcbdf09d | 1337 | } else |
c308c1b2 PE |
1338 | sk = kmalloc(prot->obj_size, priority); |
1339 | ||
2e4afe7b | 1340 | if (sk != NULL) { |
a98b65a3 VN |
1341 | kmemcheck_annotate_bitfield(sk, flags); |
1342 | ||
2e4afe7b PE |
1343 | if (security_sk_alloc(sk, family, priority)) |
1344 | goto out_free; | |
1345 | ||
1346 | if (!try_module_get(prot->owner)) | |
1347 | goto out_free_sec; | |
e022f0b4 | 1348 | sk_tx_queue_clear(sk); |
bd1060a1 | 1349 | cgroup_sk_alloc(&sk->sk_cgrp_data); |
2e4afe7b PE |
1350 | } |
1351 | ||
c308c1b2 | 1352 | return sk; |
2e4afe7b PE |
1353 | |
1354 | out_free_sec: | |
1355 | security_sk_free(sk); | |
1356 | out_free: | |
1357 | if (slab != NULL) | |
1358 | kmem_cache_free(slab, sk); | |
1359 | else | |
1360 | kfree(sk); | |
1361 | return NULL; | |
c308c1b2 PE |
1362 | } |
1363 | ||
1364 | static void sk_prot_free(struct proto *prot, struct sock *sk) | |
1365 | { | |
1366 | struct kmem_cache *slab; | |
2e4afe7b | 1367 | struct module *owner; |
c308c1b2 | 1368 | |
2e4afe7b | 1369 | owner = prot->owner; |
c308c1b2 | 1370 | slab = prot->slab; |
2e4afe7b | 1371 | |
bd1060a1 | 1372 | cgroup_sk_free(&sk->sk_cgrp_data); |
2e4afe7b | 1373 | security_sk_free(sk); |
c308c1b2 PE |
1374 | if (slab != NULL) |
1375 | kmem_cache_free(slab, sk); | |
1376 | else | |
1377 | kfree(sk); | |
2e4afe7b | 1378 | module_put(owner); |
c308c1b2 PE |
1379 | } |
1380 | ||
1da177e4 LT |
1381 | /** |
1382 | * sk_alloc - All socket objects are allocated here | |
c4ea43c5 | 1383 | * @net: the applicable net namespace |
4dc3b16b PP |
1384 | * @family: protocol family |
1385 | * @priority: for allocation (%GFP_KERNEL, %GFP_ATOMIC, etc) | |
1386 | * @prot: struct proto associated with this new sock instance | |
11aa9c28 | 1387 | * @kern: is this to be a kernel socket? |
1da177e4 | 1388 | */ |
1b8d7ae4 | 1389 | struct sock *sk_alloc(struct net *net, int family, gfp_t priority, |
11aa9c28 | 1390 | struct proto *prot, int kern) |
1da177e4 | 1391 | { |
c308c1b2 | 1392 | struct sock *sk; |
1da177e4 | 1393 | |
154adbc8 | 1394 | sk = sk_prot_alloc(prot, priority | __GFP_ZERO, family); |
1da177e4 | 1395 | if (sk) { |
154adbc8 PE |
1396 | sk->sk_family = family; |
1397 | /* | |
1398 | * See comment in struct sock definition to understand | |
1399 | * why we need sk_prot_creator -acme | |
1400 | */ | |
1401 | sk->sk_prot = sk->sk_prot_creator = prot; | |
1402 | sock_lock_init(sk); | |
26abe143 EB |
1403 | sk->sk_net_refcnt = kern ? 0 : 1; |
1404 | if (likely(sk->sk_net_refcnt)) | |
1405 | get_net(net); | |
1406 | sock_net_set(sk, net); | |
d66ee058 | 1407 | atomic_set(&sk->sk_wmem_alloc, 1); |
f8451725 | 1408 | |
2a56a1fe TH |
1409 | sock_update_classid(&sk->sk_cgrp_data); |
1410 | sock_update_netprioidx(&sk->sk_cgrp_data); | |
1da177e4 | 1411 | } |
a79af59e | 1412 | |
2e4afe7b | 1413 | return sk; |
1da177e4 | 1414 | } |
2a91525c | 1415 | EXPORT_SYMBOL(sk_alloc); |
1da177e4 | 1416 | |
eb4cb008 | 1417 | void sk_destruct(struct sock *sk) |
1da177e4 LT |
1418 | { |
1419 | struct sk_filter *filter; | |
1da177e4 LT |
1420 | |
1421 | if (sk->sk_destruct) | |
1422 | sk->sk_destruct(sk); | |
1423 | ||
a898def2 PM |
1424 | filter = rcu_dereference_check(sk->sk_filter, |
1425 | atomic_read(&sk->sk_wmem_alloc) == 0); | |
1da177e4 | 1426 | if (filter) { |
309dd5fc | 1427 | sk_filter_uncharge(sk, filter); |
a9b3cd7f | 1428 | RCU_INIT_POINTER(sk->sk_filter, NULL); |
1da177e4 | 1429 | } |
538950a1 CG |
1430 | if (rcu_access_pointer(sk->sk_reuseport_cb)) |
1431 | reuseport_detach_sock(sk); | |
1da177e4 | 1432 | |
08e29af3 | 1433 | sock_disable_timestamp(sk, SK_FLAGS_TIMESTAMP); |
1da177e4 LT |
1434 | |
1435 | if (atomic_read(&sk->sk_omem_alloc)) | |
e005d193 JP |
1436 | pr_debug("%s: optmem leakage (%d bytes) detected\n", |
1437 | __func__, atomic_read(&sk->sk_omem_alloc)); | |
1da177e4 | 1438 | |
109f6e39 EB |
1439 | if (sk->sk_peer_cred) |
1440 | put_cred(sk->sk_peer_cred); | |
1441 | put_pid(sk->sk_peer_pid); | |
26abe143 EB |
1442 | if (likely(sk->sk_net_refcnt)) |
1443 | put_net(sock_net(sk)); | |
c308c1b2 | 1444 | sk_prot_free(sk->sk_prot_creator, sk); |
1da177e4 | 1445 | } |
2b85a34e | 1446 | |
eb4cb008 CG |
1447 | static void __sk_free(struct sock *sk) |
1448 | { | |
b922622e | 1449 | if (unlikely(sock_diag_has_destroy_listeners(sk) && sk->sk_net_refcnt)) |
eb4cb008 CG |
1450 | sock_diag_broadcast_destroy(sk); |
1451 | else | |
1452 | sk_destruct(sk); | |
1453 | } | |
1454 | ||
2b85a34e ED |
1455 | void sk_free(struct sock *sk) |
1456 | { | |
1457 | /* | |
25985edc | 1458 | * We subtract one from sk_wmem_alloc and can know if |
2b85a34e ED |
1459 | * some packets are still in some tx queue. |
1460 | * If not null, sock_wfree() will call __sk_free(sk) later | |
1461 | */ | |
1462 | if (atomic_dec_and_test(&sk->sk_wmem_alloc)) | |
1463 | __sk_free(sk); | |
1464 | } | |
2a91525c | 1465 | EXPORT_SYMBOL(sk_free); |
1da177e4 | 1466 | |
e56c57d0 ED |
1467 | /** |
1468 | * sk_clone_lock - clone a socket, and lock its clone | |
1469 | * @sk: the socket to clone | |
1470 | * @priority: for allocation (%GFP_KERNEL, %GFP_ATOMIC, etc) | |
1471 | * | |
1472 | * Caller must unlock socket even in error path (bh_unlock_sock(newsk)) | |
1473 | */ | |
1474 | struct sock *sk_clone_lock(const struct sock *sk, const gfp_t priority) | |
87d11ceb | 1475 | { |
8fd1d178 | 1476 | struct sock *newsk; |
278571ba | 1477 | bool is_charged = true; |
87d11ceb | 1478 | |
8fd1d178 | 1479 | newsk = sk_prot_alloc(sk->sk_prot, priority, sk->sk_family); |
87d11ceb ACM |
1480 | if (newsk != NULL) { |
1481 | struct sk_filter *filter; | |
1482 | ||
892c141e | 1483 | sock_copy(newsk, sk); |
87d11ceb ACM |
1484 | |
1485 | /* SANITY */ | |
8a681736 SV |
1486 | if (likely(newsk->sk_net_refcnt)) |
1487 | get_net(sock_net(newsk)); | |
87d11ceb ACM |
1488 | sk_node_init(&newsk->sk_node); |
1489 | sock_lock_init(newsk); | |
1490 | bh_lock_sock(newsk); | |
fa438ccf | 1491 | newsk->sk_backlog.head = newsk->sk_backlog.tail = NULL; |
8eae939f | 1492 | newsk->sk_backlog.len = 0; |
87d11ceb ACM |
1493 | |
1494 | atomic_set(&newsk->sk_rmem_alloc, 0); | |
2b85a34e ED |
1495 | /* |
1496 | * sk_wmem_alloc set to one (see sk_free() and sock_wfree()) | |
1497 | */ | |
1498 | atomic_set(&newsk->sk_wmem_alloc, 1); | |
87d11ceb ACM |
1499 | atomic_set(&newsk->sk_omem_alloc, 0); |
1500 | skb_queue_head_init(&newsk->sk_receive_queue); | |
1501 | skb_queue_head_init(&newsk->sk_write_queue); | |
1502 | ||
87d11ceb | 1503 | rwlock_init(&newsk->sk_callback_lock); |
443aef0e PZ |
1504 | lockdep_set_class_and_name(&newsk->sk_callback_lock, |
1505 | af_callback_keys + newsk->sk_family, | |
1506 | af_family_clock_key_strings[newsk->sk_family]); | |
87d11ceb ACM |
1507 | |
1508 | newsk->sk_dst_cache = NULL; | |
1509 | newsk->sk_wmem_queued = 0; | |
1510 | newsk->sk_forward_alloc = 0; | |
1511 | newsk->sk_send_head = NULL; | |
87d11ceb ACM |
1512 | newsk->sk_userlocks = sk->sk_userlocks & ~SOCK_BINDPORT_LOCK; |
1513 | ||
1514 | sock_reset_flag(newsk, SOCK_DONE); | |
1515 | skb_queue_head_init(&newsk->sk_error_queue); | |
1516 | ||
0d7da9dd | 1517 | filter = rcu_dereference_protected(newsk->sk_filter, 1); |
87d11ceb | 1518 | if (filter != NULL) |
278571ba AS |
1519 | /* though it's an empty new sock, the charging may fail |
1520 | * if sysctl_optmem_max was changed between creation of | |
1521 | * original socket and cloning | |
1522 | */ | |
1523 | is_charged = sk_filter_charge(newsk, filter); | |
87d11ceb | 1524 | |
d188ba86 | 1525 | if (unlikely(!is_charged || xfrm_sk_clone_policy(newsk, sk))) { |
87d11ceb ACM |
1526 | /* It is still raw copy of parent, so invalidate |
1527 | * destructor and make plain sk_free() */ | |
1528 | newsk->sk_destruct = NULL; | |
b0691c8e | 1529 | bh_unlock_sock(newsk); |
87d11ceb ACM |
1530 | sk_free(newsk); |
1531 | newsk = NULL; | |
1532 | goto out; | |
1533 | } | |
1534 | ||
1535 | newsk->sk_err = 0; | |
1536 | newsk->sk_priority = 0; | |
2c8c56e1 | 1537 | newsk->sk_incoming_cpu = raw_smp_processor_id(); |
33cf7c90 | 1538 | atomic64_set(&newsk->sk_cookie, 0); |
4dc6dc71 ED |
1539 | /* |
1540 | * Before updating sk_refcnt, we must commit prior changes to memory | |
1541 | * (Documentation/RCU/rculist_nulls.txt for details) | |
1542 | */ | |
1543 | smp_wmb(); | |
87d11ceb ACM |
1544 | atomic_set(&newsk->sk_refcnt, 2); |
1545 | ||
1546 | /* | |
1547 | * Increment the counter in the same struct proto as the master | |
1548 | * sock (sk_refcnt_debug_inc uses newsk->sk_prot->socks, that | |
1549 | * is the same as sk->sk_prot->socks, as this field was copied | |
1550 | * with memcpy). | |
1551 | * | |
1552 | * This _changes_ the previous behaviour, where | |
1553 | * tcp_create_openreq_child always was incrementing the | |
1554 | * equivalent to tcp_prot->socks (inet_sock_nr), so this have | |
1555 | * to be taken into account in all callers. -acme | |
1556 | */ | |
1557 | sk_refcnt_debug_inc(newsk); | |
972692e0 | 1558 | sk_set_socket(newsk, NULL); |
43815482 | 1559 | newsk->sk_wq = NULL; |
87d11ceb | 1560 | |
baac50bb | 1561 | if (mem_cgroup_sockets_enabled && sk->sk_memcg) |
3d596f7b | 1562 | sock_update_memcg(newsk); |
f3f511e1 | 1563 | |
87d11ceb | 1564 | if (newsk->sk_prot->sockets_allocated) |
180d8cd9 | 1565 | sk_sockets_allocated_inc(newsk); |
704da560 | 1566 | |
080a270f HFS |
1567 | if (sock_needs_netstamp(sk) && |
1568 | newsk->sk_flags & SK_FLAGS_TIMESTAMP) | |
704da560 | 1569 | net_enable_timestamp(); |
87d11ceb ACM |
1570 | } |
1571 | out: | |
1572 | return newsk; | |
1573 | } | |
e56c57d0 | 1574 | EXPORT_SYMBOL_GPL(sk_clone_lock); |
87d11ceb | 1575 | |
9958089a AK |
1576 | void sk_setup_caps(struct sock *sk, struct dst_entry *dst) |
1577 | { | |
d6a4e26a ED |
1578 | u32 max_segs = 1; |
1579 | ||
6bd4f355 | 1580 | sk_dst_set(sk, dst); |
9958089a AK |
1581 | sk->sk_route_caps = dst->dev->features; |
1582 | if (sk->sk_route_caps & NETIF_F_GSO) | |
4fcd6b99 | 1583 | sk->sk_route_caps |= NETIF_F_GSO_SOFTWARE; |
a465419b | 1584 | sk->sk_route_caps &= ~sk->sk_route_nocaps; |
9958089a | 1585 | if (sk_can_gso(sk)) { |
82cc1a7a | 1586 | if (dst->header_len) { |
9958089a | 1587 | sk->sk_route_caps &= ~NETIF_F_GSO_MASK; |
82cc1a7a | 1588 | } else { |
9958089a | 1589 | sk->sk_route_caps |= NETIF_F_SG | NETIF_F_HW_CSUM; |
82cc1a7a | 1590 | sk->sk_gso_max_size = dst->dev->gso_max_size; |
d6a4e26a | 1591 | max_segs = max_t(u32, dst->dev->gso_max_segs, 1); |
82cc1a7a | 1592 | } |
9958089a | 1593 | } |
d6a4e26a | 1594 | sk->sk_gso_max_segs = max_segs; |
9958089a AK |
1595 | } |
1596 | EXPORT_SYMBOL_GPL(sk_setup_caps); | |
1597 | ||
1da177e4 LT |
1598 | /* |
1599 | * Simple resource managers for sockets. | |
1600 | */ | |
1601 | ||
1602 | ||
4ec93edb YH |
1603 | /* |
1604 | * Write buffer destructor automatically called from kfree_skb. | |
1da177e4 LT |
1605 | */ |
1606 | void sock_wfree(struct sk_buff *skb) | |
1607 | { | |
1608 | struct sock *sk = skb->sk; | |
d99927f4 | 1609 | unsigned int len = skb->truesize; |
1da177e4 | 1610 | |
d99927f4 ED |
1611 | if (!sock_flag(sk, SOCK_USE_WRITE_QUEUE)) { |
1612 | /* | |
1613 | * Keep a reference on sk_wmem_alloc, this will be released | |
1614 | * after sk_write_space() call | |
1615 | */ | |
1616 | atomic_sub(len - 1, &sk->sk_wmem_alloc); | |
1da177e4 | 1617 | sk->sk_write_space(sk); |
d99927f4 ED |
1618 | len = 1; |
1619 | } | |
2b85a34e | 1620 | /* |
d99927f4 ED |
1621 | * if sk_wmem_alloc reaches 0, we must finish what sk_free() |
1622 | * could not do because of in-flight packets | |
2b85a34e | 1623 | */ |
d99927f4 | 1624 | if (atomic_sub_and_test(len, &sk->sk_wmem_alloc)) |
2b85a34e | 1625 | __sk_free(sk); |
1da177e4 | 1626 | } |
2a91525c | 1627 | EXPORT_SYMBOL(sock_wfree); |
1da177e4 | 1628 | |
9e17f8a4 ED |
1629 | void skb_set_owner_w(struct sk_buff *skb, struct sock *sk) |
1630 | { | |
1631 | skb_orphan(skb); | |
1632 | skb->sk = sk; | |
1633 | #ifdef CONFIG_INET | |
1634 | if (unlikely(!sk_fullsock(sk))) { | |
1635 | skb->destructor = sock_edemux; | |
1636 | sock_hold(sk); | |
1637 | return; | |
1638 | } | |
1639 | #endif | |
1640 | skb->destructor = sock_wfree; | |
1641 | skb_set_hash_from_sk(skb, sk); | |
1642 | /* | |
1643 | * We used to take a refcount on sk, but following operation | |
1644 | * is enough to guarantee sk_free() wont free this sock until | |
1645 | * all in-flight packets are completed | |
1646 | */ | |
1647 | atomic_add(skb->truesize, &sk->sk_wmem_alloc); | |
1648 | } | |
1649 | EXPORT_SYMBOL(skb_set_owner_w); | |
1650 | ||
f2f872f9 ED |
1651 | void skb_orphan_partial(struct sk_buff *skb) |
1652 | { | |
1653 | /* TCP stack sets skb->ooo_okay based on sk_wmem_alloc, | |
1654 | * so we do not completely orphan skb, but transfert all | |
1655 | * accounted bytes but one, to avoid unexpected reorders. | |
1656 | */ | |
1657 | if (skb->destructor == sock_wfree | |
1658 | #ifdef CONFIG_INET | |
1659 | || skb->destructor == tcp_wfree | |
1660 | #endif | |
1661 | ) { | |
1662 | atomic_sub(skb->truesize - 1, &skb->sk->sk_wmem_alloc); | |
1663 | skb->truesize = 1; | |
1664 | } else { | |
1665 | skb_orphan(skb); | |
1666 | } | |
1667 | } | |
1668 | EXPORT_SYMBOL(skb_orphan_partial); | |
1669 | ||
4ec93edb YH |
1670 | /* |
1671 | * Read buffer destructor automatically called from kfree_skb. | |
1da177e4 LT |
1672 | */ |
1673 | void sock_rfree(struct sk_buff *skb) | |
1674 | { | |
1675 | struct sock *sk = skb->sk; | |
d361fd59 | 1676 | unsigned int len = skb->truesize; |
1da177e4 | 1677 | |
d361fd59 ED |
1678 | atomic_sub(len, &sk->sk_rmem_alloc); |
1679 | sk_mem_uncharge(sk, len); | |
1da177e4 | 1680 | } |
2a91525c | 1681 | EXPORT_SYMBOL(sock_rfree); |
1da177e4 | 1682 | |
7768eed8 OH |
1683 | /* |
1684 | * Buffer destructor for skbs that are not used directly in read or write | |
1685 | * path, e.g. for error handler skbs. Automatically called from kfree_skb. | |
1686 | */ | |
62bccb8c AD |
1687 | void sock_efree(struct sk_buff *skb) |
1688 | { | |
1689 | sock_put(skb->sk); | |
1690 | } | |
1691 | EXPORT_SYMBOL(sock_efree); | |
1692 | ||
976d0201 | 1693 | kuid_t sock_i_uid(struct sock *sk) |
1da177e4 | 1694 | { |
976d0201 | 1695 | kuid_t uid; |
1da177e4 | 1696 | |
f064af1e | 1697 | read_lock_bh(&sk->sk_callback_lock); |
976d0201 | 1698 | uid = sk->sk_socket ? SOCK_INODE(sk->sk_socket)->i_uid : GLOBAL_ROOT_UID; |
f064af1e | 1699 | read_unlock_bh(&sk->sk_callback_lock); |
1da177e4 LT |
1700 | return uid; |
1701 | } | |
2a91525c | 1702 | EXPORT_SYMBOL(sock_i_uid); |
1da177e4 LT |
1703 | |
1704 | unsigned long sock_i_ino(struct sock *sk) | |
1705 | { | |
1706 | unsigned long ino; | |
1707 | ||
f064af1e | 1708 | read_lock_bh(&sk->sk_callback_lock); |
1da177e4 | 1709 | ino = sk->sk_socket ? SOCK_INODE(sk->sk_socket)->i_ino : 0; |
f064af1e | 1710 | read_unlock_bh(&sk->sk_callback_lock); |
1da177e4 LT |
1711 | return ino; |
1712 | } | |
2a91525c | 1713 | EXPORT_SYMBOL(sock_i_ino); |
1da177e4 LT |
1714 | |
1715 | /* | |
1716 | * Allocate a skb from the socket's send buffer. | |
1717 | */ | |
86a76caf | 1718 | struct sk_buff *sock_wmalloc(struct sock *sk, unsigned long size, int force, |
dd0fc66f | 1719 | gfp_t priority) |
1da177e4 LT |
1720 | { |
1721 | if (force || atomic_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf) { | |
2a91525c | 1722 | struct sk_buff *skb = alloc_skb(size, priority); |
1da177e4 LT |
1723 | if (skb) { |
1724 | skb_set_owner_w(skb, sk); | |
1725 | return skb; | |
1726 | } | |
1727 | } | |
1728 | return NULL; | |
1729 | } | |
2a91525c | 1730 | EXPORT_SYMBOL(sock_wmalloc); |
1da177e4 | 1731 | |
4ec93edb | 1732 | /* |
1da177e4 | 1733 | * Allocate a memory block from the socket's option memory buffer. |
4ec93edb | 1734 | */ |
dd0fc66f | 1735 | void *sock_kmalloc(struct sock *sk, int size, gfp_t priority) |
1da177e4 | 1736 | { |
95c96174 | 1737 | if ((unsigned int)size <= sysctl_optmem_max && |
1da177e4 LT |
1738 | atomic_read(&sk->sk_omem_alloc) + size < sysctl_optmem_max) { |
1739 | void *mem; | |
1740 | /* First do the add, to avoid the race if kmalloc | |
4ec93edb | 1741 | * might sleep. |
1da177e4 LT |
1742 | */ |
1743 | atomic_add(size, &sk->sk_omem_alloc); | |
1744 | mem = kmalloc(size, priority); | |
1745 | if (mem) | |
1746 | return mem; | |
1747 | atomic_sub(size, &sk->sk_omem_alloc); | |
1748 | } | |
1749 | return NULL; | |
1750 | } | |
2a91525c | 1751 | EXPORT_SYMBOL(sock_kmalloc); |
1da177e4 | 1752 | |
79e88659 DB |
1753 | /* Free an option memory block. Note, we actually want the inline |
1754 | * here as this allows gcc to detect the nullify and fold away the | |
1755 | * condition entirely. | |
1da177e4 | 1756 | */ |
79e88659 DB |
1757 | static inline void __sock_kfree_s(struct sock *sk, void *mem, int size, |
1758 | const bool nullify) | |
1da177e4 | 1759 | { |
e53da5fb DM |
1760 | if (WARN_ON_ONCE(!mem)) |
1761 | return; | |
79e88659 DB |
1762 | if (nullify) |
1763 | kzfree(mem); | |
1764 | else | |
1765 | kfree(mem); | |
1da177e4 LT |
1766 | atomic_sub(size, &sk->sk_omem_alloc); |
1767 | } | |
79e88659 DB |
1768 | |
1769 | void sock_kfree_s(struct sock *sk, void *mem, int size) | |
1770 | { | |
1771 | __sock_kfree_s(sk, mem, size, false); | |
1772 | } | |
2a91525c | 1773 | EXPORT_SYMBOL(sock_kfree_s); |
1da177e4 | 1774 | |
79e88659 DB |
1775 | void sock_kzfree_s(struct sock *sk, void *mem, int size) |
1776 | { | |
1777 | __sock_kfree_s(sk, mem, size, true); | |
1778 | } | |
1779 | EXPORT_SYMBOL(sock_kzfree_s); | |
1780 | ||
1da177e4 LT |
1781 | /* It is almost wait_for_tcp_memory minus release_sock/lock_sock. |
1782 | I think, these locks should be removed for datagram sockets. | |
1783 | */ | |
2a91525c | 1784 | static long sock_wait_for_wmem(struct sock *sk, long timeo) |
1da177e4 LT |
1785 | { |
1786 | DEFINE_WAIT(wait); | |
1787 | ||
9cd3e072 | 1788 | sk_clear_bit(SOCKWQ_ASYNC_NOSPACE, sk); |
1da177e4 LT |
1789 | for (;;) { |
1790 | if (!timeo) | |
1791 | break; | |
1792 | if (signal_pending(current)) | |
1793 | break; | |
1794 | set_bit(SOCK_NOSPACE, &sk->sk_socket->flags); | |
aa395145 | 1795 | prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE); |
1da177e4 LT |
1796 | if (atomic_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf) |
1797 | break; | |
1798 | if (sk->sk_shutdown & SEND_SHUTDOWN) | |
1799 | break; | |
1800 | if (sk->sk_err) | |
1801 | break; | |
1802 | timeo = schedule_timeout(timeo); | |
1803 | } | |
aa395145 | 1804 | finish_wait(sk_sleep(sk), &wait); |
1da177e4 LT |
1805 | return timeo; |
1806 | } | |
1807 | ||
1808 | ||
1809 | /* | |
1810 | * Generic send/receive buffer handlers | |
1811 | */ | |
1812 | ||
4cc7f68d HX |
1813 | struct sk_buff *sock_alloc_send_pskb(struct sock *sk, unsigned long header_len, |
1814 | unsigned long data_len, int noblock, | |
28d64271 | 1815 | int *errcode, int max_page_order) |
1da177e4 | 1816 | { |
2e4e4410 | 1817 | struct sk_buff *skb; |
1da177e4 LT |
1818 | long timeo; |
1819 | int err; | |
1820 | ||
1da177e4 | 1821 | timeo = sock_sndtimeo(sk, noblock); |
2e4e4410 | 1822 | for (;;) { |
1da177e4 LT |
1823 | err = sock_error(sk); |
1824 | if (err != 0) | |
1825 | goto failure; | |
1826 | ||
1827 | err = -EPIPE; | |
1828 | if (sk->sk_shutdown & SEND_SHUTDOWN) | |
1829 | goto failure; | |
1830 | ||
2e4e4410 ED |
1831 | if (sk_wmem_alloc_get(sk) < sk->sk_sndbuf) |
1832 | break; | |
28d64271 | 1833 | |
9cd3e072 | 1834 | sk_set_bit(SOCKWQ_ASYNC_NOSPACE, sk); |
2e4e4410 ED |
1835 | set_bit(SOCK_NOSPACE, &sk->sk_socket->flags); |
1836 | err = -EAGAIN; | |
1837 | if (!timeo) | |
1da177e4 | 1838 | goto failure; |
2e4e4410 ED |
1839 | if (signal_pending(current)) |
1840 | goto interrupted; | |
1841 | timeo = sock_wait_for_wmem(sk, timeo); | |
1da177e4 | 1842 | } |
2e4e4410 ED |
1843 | skb = alloc_skb_with_frags(header_len, data_len, max_page_order, |
1844 | errcode, sk->sk_allocation); | |
1845 | if (skb) | |
1846 | skb_set_owner_w(skb, sk); | |
1da177e4 LT |
1847 | return skb; |
1848 | ||
1849 | interrupted: | |
1850 | err = sock_intr_errno(timeo); | |
1851 | failure: | |
1852 | *errcode = err; | |
1853 | return NULL; | |
1854 | } | |
4cc7f68d | 1855 | EXPORT_SYMBOL(sock_alloc_send_pskb); |
1da177e4 | 1856 | |
4ec93edb | 1857 | struct sk_buff *sock_alloc_send_skb(struct sock *sk, unsigned long size, |
1da177e4 LT |
1858 | int noblock, int *errcode) |
1859 | { | |
28d64271 | 1860 | return sock_alloc_send_pskb(sk, size, 0, noblock, errcode, 0); |
1da177e4 | 1861 | } |
2a91525c | 1862 | EXPORT_SYMBOL(sock_alloc_send_skb); |
1da177e4 | 1863 | |
f28ea365 EJ |
1864 | int sock_cmsg_send(struct sock *sk, struct msghdr *msg, |
1865 | struct sockcm_cookie *sockc) | |
1866 | { | |
1867 | struct cmsghdr *cmsg; | |
1868 | ||
1869 | for_each_cmsghdr(cmsg, msg) { | |
1870 | if (!CMSG_OK(msg, cmsg)) | |
1871 | return -EINVAL; | |
1872 | if (cmsg->cmsg_level != SOL_SOCKET) | |
1873 | continue; | |
1874 | switch (cmsg->cmsg_type) { | |
1875 | case SO_MARK: | |
1876 | if (!ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN)) | |
1877 | return -EPERM; | |
1878 | if (cmsg->cmsg_len != CMSG_LEN(sizeof(u32))) | |
1879 | return -EINVAL; | |
1880 | sockc->mark = *(u32 *)CMSG_DATA(cmsg); | |
1881 | break; | |
1882 | default: | |
1883 | return -EINVAL; | |
1884 | } | |
1885 | } | |
1886 | return 0; | |
1887 | } | |
1888 | EXPORT_SYMBOL(sock_cmsg_send); | |
1889 | ||
5640f768 ED |
1890 | /* On 32bit arches, an skb frag is limited to 2^15 */ |
1891 | #define SKB_FRAG_PAGE_ORDER get_order(32768) | |
1892 | ||
400dfd3a ED |
1893 | /** |
1894 | * skb_page_frag_refill - check that a page_frag contains enough room | |
1895 | * @sz: minimum size of the fragment we want to get | |
1896 | * @pfrag: pointer to page_frag | |
82d5e2b8 | 1897 | * @gfp: priority for memory allocation |
400dfd3a ED |
1898 | * |
1899 | * Note: While this allocator tries to use high order pages, there is | |
1900 | * no guarantee that allocations succeed. Therefore, @sz MUST be | |
1901 | * less or equal than PAGE_SIZE. | |
1902 | */ | |
d9b2938a | 1903 | bool skb_page_frag_refill(unsigned int sz, struct page_frag *pfrag, gfp_t gfp) |
5640f768 | 1904 | { |
5640f768 | 1905 | if (pfrag->page) { |
fe896d18 | 1906 | if (page_ref_count(pfrag->page) == 1) { |
5640f768 ED |
1907 | pfrag->offset = 0; |
1908 | return true; | |
1909 | } | |
400dfd3a | 1910 | if (pfrag->offset + sz <= pfrag->size) |
5640f768 ED |
1911 | return true; |
1912 | put_page(pfrag->page); | |
1913 | } | |
1914 | ||
d9b2938a ED |
1915 | pfrag->offset = 0; |
1916 | if (SKB_FRAG_PAGE_ORDER) { | |
d0164adc MG |
1917 | /* Avoid direct reclaim but allow kswapd to wake */ |
1918 | pfrag->page = alloc_pages((gfp & ~__GFP_DIRECT_RECLAIM) | | |
1919 | __GFP_COMP | __GFP_NOWARN | | |
1920 | __GFP_NORETRY, | |
d9b2938a | 1921 | SKB_FRAG_PAGE_ORDER); |
5640f768 | 1922 | if (likely(pfrag->page)) { |
d9b2938a | 1923 | pfrag->size = PAGE_SIZE << SKB_FRAG_PAGE_ORDER; |
5640f768 ED |
1924 | return true; |
1925 | } | |
d9b2938a ED |
1926 | } |
1927 | pfrag->page = alloc_page(gfp); | |
1928 | if (likely(pfrag->page)) { | |
1929 | pfrag->size = PAGE_SIZE; | |
1930 | return true; | |
1931 | } | |
400dfd3a ED |
1932 | return false; |
1933 | } | |
1934 | EXPORT_SYMBOL(skb_page_frag_refill); | |
1935 | ||
1936 | bool sk_page_frag_refill(struct sock *sk, struct page_frag *pfrag) | |
1937 | { | |
1938 | if (likely(skb_page_frag_refill(32U, pfrag, sk->sk_allocation))) | |
1939 | return true; | |
1940 | ||
5640f768 ED |
1941 | sk_enter_memory_pressure(sk); |
1942 | sk_stream_moderate_sndbuf(sk); | |
1943 | return false; | |
1944 | } | |
1945 | EXPORT_SYMBOL(sk_page_frag_refill); | |
1946 | ||
1da177e4 | 1947 | static void __lock_sock(struct sock *sk) |
f39234d6 NK |
1948 | __releases(&sk->sk_lock.slock) |
1949 | __acquires(&sk->sk_lock.slock) | |
1da177e4 LT |
1950 | { |
1951 | DEFINE_WAIT(wait); | |
1952 | ||
e71a4783 | 1953 | for (;;) { |
1da177e4 LT |
1954 | prepare_to_wait_exclusive(&sk->sk_lock.wq, &wait, |
1955 | TASK_UNINTERRUPTIBLE); | |
1956 | spin_unlock_bh(&sk->sk_lock.slock); | |
1957 | schedule(); | |
1958 | spin_lock_bh(&sk->sk_lock.slock); | |
e71a4783 | 1959 | if (!sock_owned_by_user(sk)) |
1da177e4 LT |
1960 | break; |
1961 | } | |
1962 | finish_wait(&sk->sk_lock.wq, &wait); | |
1963 | } | |
1964 | ||
1965 | static void __release_sock(struct sock *sk) | |
f39234d6 NK |
1966 | __releases(&sk->sk_lock.slock) |
1967 | __acquires(&sk->sk_lock.slock) | |
1da177e4 LT |
1968 | { |
1969 | struct sk_buff *skb = sk->sk_backlog.head; | |
1970 | ||
1971 | do { | |
1972 | sk->sk_backlog.head = sk->sk_backlog.tail = NULL; | |
1973 | bh_unlock_sock(sk); | |
1974 | ||
1975 | do { | |
1976 | struct sk_buff *next = skb->next; | |
1977 | ||
e4cbb02a | 1978 | prefetch(next); |
7fee226a | 1979 | WARN_ON_ONCE(skb_dst_is_noref(skb)); |
1da177e4 | 1980 | skb->next = NULL; |
c57943a1 | 1981 | sk_backlog_rcv(sk, skb); |
1da177e4 LT |
1982 | |
1983 | /* | |
1984 | * We are in process context here with softirqs | |
1985 | * disabled, use cond_resched_softirq() to preempt. | |
1986 | * This is safe to do because we've taken the backlog | |
1987 | * queue private: | |
1988 | */ | |
1989 | cond_resched_softirq(); | |
1990 | ||
1991 | skb = next; | |
1992 | } while (skb != NULL); | |
1993 | ||
1994 | bh_lock_sock(sk); | |
e71a4783 | 1995 | } while ((skb = sk->sk_backlog.head) != NULL); |
8eae939f ZY |
1996 | |
1997 | /* | |
1998 | * Doing the zeroing here guarantee we can not loop forever | |
1999 | * while a wild producer attempts to flood us. | |
2000 | */ | |
2001 | sk->sk_backlog.len = 0; | |
1da177e4 LT |
2002 | } |
2003 | ||
2004 | /** | |
2005 | * sk_wait_data - wait for data to arrive at sk_receive_queue | |
4dc3b16b PP |
2006 | * @sk: sock to wait on |
2007 | * @timeo: for how long | |
dfbafc99 | 2008 | * @skb: last skb seen on sk_receive_queue |
1da177e4 LT |
2009 | * |
2010 | * Now socket state including sk->sk_err is changed only under lock, | |
2011 | * hence we may omit checks after joining wait queue. | |
2012 | * We check receive queue before schedule() only as optimization; | |
2013 | * it is very likely that release_sock() added new data. | |
2014 | */ | |
dfbafc99 | 2015 | int sk_wait_data(struct sock *sk, long *timeo, const struct sk_buff *skb) |
1da177e4 LT |
2016 | { |
2017 | int rc; | |
2018 | DEFINE_WAIT(wait); | |
2019 | ||
aa395145 | 2020 | prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE); |
9cd3e072 | 2021 | sk_set_bit(SOCKWQ_ASYNC_WAITDATA, sk); |
dfbafc99 | 2022 | rc = sk_wait_event(sk, timeo, skb_peek_tail(&sk->sk_receive_queue) != skb); |
9cd3e072 | 2023 | sk_clear_bit(SOCKWQ_ASYNC_WAITDATA, sk); |
aa395145 | 2024 | finish_wait(sk_sleep(sk), &wait); |
1da177e4 LT |
2025 | return rc; |
2026 | } | |
1da177e4 LT |
2027 | EXPORT_SYMBOL(sk_wait_data); |
2028 | ||
3ab224be HA |
2029 | /** |
2030 | * __sk_mem_schedule - increase sk_forward_alloc and memory_allocated | |
2031 | * @sk: socket | |
2032 | * @size: memory size to allocate | |
2033 | * @kind: allocation type | |
2034 | * | |
2035 | * If kind is SK_MEM_SEND, it means wmem allocation. Otherwise it means | |
2036 | * rmem allocation. This function assumes that protocols which have | |
2037 | * memory_pressure use sk_wmem_queued as write buffer accounting. | |
2038 | */ | |
2039 | int __sk_mem_schedule(struct sock *sk, int size, int kind) | |
2040 | { | |
2041 | struct proto *prot = sk->sk_prot; | |
2042 | int amt = sk_mem_pages(size); | |
8d987e5c | 2043 | long allocated; |
3ab224be HA |
2044 | |
2045 | sk->sk_forward_alloc += amt * SK_MEM_QUANTUM; | |
180d8cd9 | 2046 | |
e805605c JW |
2047 | allocated = sk_memory_allocated_add(sk, amt); |
2048 | ||
baac50bb JW |
2049 | if (mem_cgroup_sockets_enabled && sk->sk_memcg && |
2050 | !mem_cgroup_charge_skmem(sk->sk_memcg, amt)) | |
e805605c | 2051 | goto suppress_allocation; |
3ab224be HA |
2052 | |
2053 | /* Under limit. */ | |
e805605c | 2054 | if (allocated <= sk_prot_mem_limits(sk, 0)) { |
180d8cd9 | 2055 | sk_leave_memory_pressure(sk); |
3ab224be HA |
2056 | return 1; |
2057 | } | |
2058 | ||
e805605c JW |
2059 | /* Under pressure. */ |
2060 | if (allocated > sk_prot_mem_limits(sk, 1)) | |
180d8cd9 | 2061 | sk_enter_memory_pressure(sk); |
3ab224be | 2062 | |
e805605c JW |
2063 | /* Over hard limit. */ |
2064 | if (allocated > sk_prot_mem_limits(sk, 2)) | |
3ab224be HA |
2065 | goto suppress_allocation; |
2066 | ||
2067 | /* guarantee minimum buffer size under pressure */ | |
2068 | if (kind == SK_MEM_RECV) { | |
2069 | if (atomic_read(&sk->sk_rmem_alloc) < prot->sysctl_rmem[0]) | |
2070 | return 1; | |
180d8cd9 | 2071 | |
3ab224be HA |
2072 | } else { /* SK_MEM_SEND */ |
2073 | if (sk->sk_type == SOCK_STREAM) { | |
2074 | if (sk->sk_wmem_queued < prot->sysctl_wmem[0]) | |
2075 | return 1; | |
2076 | } else if (atomic_read(&sk->sk_wmem_alloc) < | |
2077 | prot->sysctl_wmem[0]) | |
2078 | return 1; | |
2079 | } | |
2080 | ||
180d8cd9 | 2081 | if (sk_has_memory_pressure(sk)) { |
1748376b ED |
2082 | int alloc; |
2083 | ||
180d8cd9 | 2084 | if (!sk_under_memory_pressure(sk)) |
1748376b | 2085 | return 1; |
180d8cd9 GC |
2086 | alloc = sk_sockets_allocated_read_positive(sk); |
2087 | if (sk_prot_mem_limits(sk, 2) > alloc * | |
3ab224be HA |
2088 | sk_mem_pages(sk->sk_wmem_queued + |
2089 | atomic_read(&sk->sk_rmem_alloc) + | |
2090 | sk->sk_forward_alloc)) | |
2091 | return 1; | |
2092 | } | |
2093 | ||
2094 | suppress_allocation: | |
2095 | ||
2096 | if (kind == SK_MEM_SEND && sk->sk_type == SOCK_STREAM) { | |
2097 | sk_stream_moderate_sndbuf(sk); | |
2098 | ||
2099 | /* Fail only if socket is _under_ its sndbuf. | |
2100 | * In this case we cannot block, so that we have to fail. | |
2101 | */ | |
2102 | if (sk->sk_wmem_queued + size >= sk->sk_sndbuf) | |
2103 | return 1; | |
2104 | } | |
2105 | ||
3847ce32 SM |
2106 | trace_sock_exceed_buf_limit(sk, prot, allocated); |
2107 | ||
3ab224be HA |
2108 | /* Alas. Undo changes. */ |
2109 | sk->sk_forward_alloc -= amt * SK_MEM_QUANTUM; | |
180d8cd9 | 2110 | |
0e90b31f | 2111 | sk_memory_allocated_sub(sk, amt); |
180d8cd9 | 2112 | |
baac50bb JW |
2113 | if (mem_cgroup_sockets_enabled && sk->sk_memcg) |
2114 | mem_cgroup_uncharge_skmem(sk->sk_memcg, amt); | |
e805605c | 2115 | |
3ab224be HA |
2116 | return 0; |
2117 | } | |
3ab224be HA |
2118 | EXPORT_SYMBOL(__sk_mem_schedule); |
2119 | ||
2120 | /** | |
69dba9bb | 2121 | * __sk_mem_reclaim - reclaim memory_allocated |
3ab224be | 2122 | * @sk: socket |
1a24e04e | 2123 | * @amount: number of bytes (rounded down to a SK_MEM_QUANTUM multiple) |
3ab224be | 2124 | */ |
1a24e04e | 2125 | void __sk_mem_reclaim(struct sock *sk, int amount) |
3ab224be | 2126 | { |
1a24e04e ED |
2127 | amount >>= SK_MEM_QUANTUM_SHIFT; |
2128 | sk_memory_allocated_sub(sk, amount); | |
2129 | sk->sk_forward_alloc -= amount << SK_MEM_QUANTUM_SHIFT; | |
3ab224be | 2130 | |
baac50bb JW |
2131 | if (mem_cgroup_sockets_enabled && sk->sk_memcg) |
2132 | mem_cgroup_uncharge_skmem(sk->sk_memcg, amount); | |
e805605c | 2133 | |
180d8cd9 GC |
2134 | if (sk_under_memory_pressure(sk) && |
2135 | (sk_memory_allocated(sk) < sk_prot_mem_limits(sk, 0))) | |
2136 | sk_leave_memory_pressure(sk); | |
3ab224be | 2137 | } |
3ab224be HA |
2138 | EXPORT_SYMBOL(__sk_mem_reclaim); |
2139 | ||
2140 | ||
1da177e4 LT |
2141 | /* |
2142 | * Set of default routines for initialising struct proto_ops when | |
2143 | * the protocol does not support a particular function. In certain | |
2144 | * cases where it makes no sense for a protocol to have a "do nothing" | |
2145 | * function, some default processing is provided. | |
2146 | */ | |
2147 | ||
2148 | int sock_no_bind(struct socket *sock, struct sockaddr *saddr, int len) | |
2149 | { | |
2150 | return -EOPNOTSUPP; | |
2151 | } | |
2a91525c | 2152 | EXPORT_SYMBOL(sock_no_bind); |
1da177e4 | 2153 | |
4ec93edb | 2154 | int sock_no_connect(struct socket *sock, struct sockaddr *saddr, |
1da177e4 LT |
2155 | int len, int flags) |
2156 | { | |
2157 | return -EOPNOTSUPP; | |
2158 | } | |
2a91525c | 2159 | EXPORT_SYMBOL(sock_no_connect); |
1da177e4 LT |
2160 | |
2161 | int sock_no_socketpair(struct socket *sock1, struct socket *sock2) | |
2162 | { | |
2163 | return -EOPNOTSUPP; | |
2164 | } | |
2a91525c | 2165 | EXPORT_SYMBOL(sock_no_socketpair); |
1da177e4 LT |
2166 | |
2167 | int sock_no_accept(struct socket *sock, struct socket *newsock, int flags) | |
2168 | { | |
2169 | return -EOPNOTSUPP; | |
2170 | } | |
2a91525c | 2171 | EXPORT_SYMBOL(sock_no_accept); |
1da177e4 | 2172 | |
4ec93edb | 2173 | int sock_no_getname(struct socket *sock, struct sockaddr *saddr, |
1da177e4 LT |
2174 | int *len, int peer) |
2175 | { | |
2176 | return -EOPNOTSUPP; | |
2177 | } | |
2a91525c | 2178 | EXPORT_SYMBOL(sock_no_getname); |
1da177e4 | 2179 | |
2a91525c | 2180 | unsigned int sock_no_poll(struct file *file, struct socket *sock, poll_table *pt) |
1da177e4 LT |
2181 | { |
2182 | return 0; | |
2183 | } | |
2a91525c | 2184 | EXPORT_SYMBOL(sock_no_poll); |
1da177e4 LT |
2185 | |
2186 | int sock_no_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg) | |
2187 | { | |
2188 | return -EOPNOTSUPP; | |
2189 | } | |
2a91525c | 2190 | EXPORT_SYMBOL(sock_no_ioctl); |
1da177e4 LT |
2191 | |
2192 | int sock_no_listen(struct socket *sock, int backlog) | |
2193 | { | |
2194 | return -EOPNOTSUPP; | |
2195 | } | |
2a91525c | 2196 | EXPORT_SYMBOL(sock_no_listen); |
1da177e4 LT |
2197 | |
2198 | int sock_no_shutdown(struct socket *sock, int how) | |
2199 | { | |
2200 | return -EOPNOTSUPP; | |
2201 | } | |
2a91525c | 2202 | EXPORT_SYMBOL(sock_no_shutdown); |
1da177e4 LT |
2203 | |
2204 | int sock_no_setsockopt(struct socket *sock, int level, int optname, | |
b7058842 | 2205 | char __user *optval, unsigned int optlen) |
1da177e4 LT |
2206 | { |
2207 | return -EOPNOTSUPP; | |
2208 | } | |
2a91525c | 2209 | EXPORT_SYMBOL(sock_no_setsockopt); |
1da177e4 LT |
2210 | |
2211 | int sock_no_getsockopt(struct socket *sock, int level, int optname, | |
2212 | char __user *optval, int __user *optlen) | |
2213 | { | |
2214 | return -EOPNOTSUPP; | |
2215 | } | |
2a91525c | 2216 | EXPORT_SYMBOL(sock_no_getsockopt); |
1da177e4 | 2217 | |
1b784140 | 2218 | int sock_no_sendmsg(struct socket *sock, struct msghdr *m, size_t len) |
1da177e4 LT |
2219 | { |
2220 | return -EOPNOTSUPP; | |
2221 | } | |
2a91525c | 2222 | EXPORT_SYMBOL(sock_no_sendmsg); |
1da177e4 | 2223 | |
1b784140 YX |
2224 | int sock_no_recvmsg(struct socket *sock, struct msghdr *m, size_t len, |
2225 | int flags) | |
1da177e4 LT |
2226 | { |
2227 | return -EOPNOTSUPP; | |
2228 | } | |
2a91525c | 2229 | EXPORT_SYMBOL(sock_no_recvmsg); |
1da177e4 LT |
2230 | |
2231 | int sock_no_mmap(struct file *file, struct socket *sock, struct vm_area_struct *vma) | |
2232 | { | |
2233 | /* Mirror missing mmap method error code */ | |
2234 | return -ENODEV; | |
2235 | } | |
2a91525c | 2236 | EXPORT_SYMBOL(sock_no_mmap); |
1da177e4 LT |
2237 | |
2238 | ssize_t sock_no_sendpage(struct socket *sock, struct page *page, int offset, size_t size, int flags) | |
2239 | { | |
2240 | ssize_t res; | |
2241 | struct msghdr msg = {.msg_flags = flags}; | |
2242 | struct kvec iov; | |
2243 | char *kaddr = kmap(page); | |
2244 | iov.iov_base = kaddr + offset; | |
2245 | iov.iov_len = size; | |
2246 | res = kernel_sendmsg(sock, &msg, &iov, 1, size); | |
2247 | kunmap(page); | |
2248 | return res; | |
2249 | } | |
2a91525c | 2250 | EXPORT_SYMBOL(sock_no_sendpage); |
1da177e4 LT |
2251 | |
2252 | /* | |
2253 | * Default Socket Callbacks | |
2254 | */ | |
2255 | ||
2256 | static void sock_def_wakeup(struct sock *sk) | |
2257 | { | |
43815482 ED |
2258 | struct socket_wq *wq; |
2259 | ||
2260 | rcu_read_lock(); | |
2261 | wq = rcu_dereference(sk->sk_wq); | |
1ce0bf50 | 2262 | if (skwq_has_sleeper(wq)) |
43815482 ED |
2263 | wake_up_interruptible_all(&wq->wait); |
2264 | rcu_read_unlock(); | |
1da177e4 LT |
2265 | } |
2266 | ||
2267 | static void sock_def_error_report(struct sock *sk) | |
2268 | { | |
43815482 ED |
2269 | struct socket_wq *wq; |
2270 | ||
2271 | rcu_read_lock(); | |
2272 | wq = rcu_dereference(sk->sk_wq); | |
1ce0bf50 | 2273 | if (skwq_has_sleeper(wq)) |
43815482 | 2274 | wake_up_interruptible_poll(&wq->wait, POLLERR); |
8d8ad9d7 | 2275 | sk_wake_async(sk, SOCK_WAKE_IO, POLL_ERR); |
43815482 | 2276 | rcu_read_unlock(); |
1da177e4 LT |
2277 | } |
2278 | ||
676d2369 | 2279 | static void sock_def_readable(struct sock *sk) |
1da177e4 | 2280 | { |
43815482 ED |
2281 | struct socket_wq *wq; |
2282 | ||
2283 | rcu_read_lock(); | |
2284 | wq = rcu_dereference(sk->sk_wq); | |
1ce0bf50 | 2285 | if (skwq_has_sleeper(wq)) |
2c6607c6 | 2286 | wake_up_interruptible_sync_poll(&wq->wait, POLLIN | POLLPRI | |
37e5540b | 2287 | POLLRDNORM | POLLRDBAND); |
8d8ad9d7 | 2288 | sk_wake_async(sk, SOCK_WAKE_WAITD, POLL_IN); |
43815482 | 2289 | rcu_read_unlock(); |
1da177e4 LT |
2290 | } |
2291 | ||
2292 | static void sock_def_write_space(struct sock *sk) | |
2293 | { | |
43815482 ED |
2294 | struct socket_wq *wq; |
2295 | ||
2296 | rcu_read_lock(); | |
1da177e4 LT |
2297 | |
2298 | /* Do not wake up a writer until he can make "significant" | |
2299 | * progress. --DaveM | |
2300 | */ | |
e71a4783 | 2301 | if ((atomic_read(&sk->sk_wmem_alloc) << 1) <= sk->sk_sndbuf) { |
43815482 | 2302 | wq = rcu_dereference(sk->sk_wq); |
1ce0bf50 | 2303 | if (skwq_has_sleeper(wq)) |
43815482 | 2304 | wake_up_interruptible_sync_poll(&wq->wait, POLLOUT | |
37e5540b | 2305 | POLLWRNORM | POLLWRBAND); |
1da177e4 LT |
2306 | |
2307 | /* Should agree with poll, otherwise some programs break */ | |
2308 | if (sock_writeable(sk)) | |
8d8ad9d7 | 2309 | sk_wake_async(sk, SOCK_WAKE_SPACE, POLL_OUT); |
1da177e4 LT |
2310 | } |
2311 | ||
43815482 | 2312 | rcu_read_unlock(); |
1da177e4 LT |
2313 | } |
2314 | ||
2315 | static void sock_def_destruct(struct sock *sk) | |
2316 | { | |
1da177e4 LT |
2317 | } |
2318 | ||
2319 | void sk_send_sigurg(struct sock *sk) | |
2320 | { | |
2321 | if (sk->sk_socket && sk->sk_socket->file) | |
2322 | if (send_sigurg(&sk->sk_socket->file->f_owner)) | |
8d8ad9d7 | 2323 | sk_wake_async(sk, SOCK_WAKE_URG, POLL_PRI); |
1da177e4 | 2324 | } |
2a91525c | 2325 | EXPORT_SYMBOL(sk_send_sigurg); |
1da177e4 LT |
2326 | |
2327 | void sk_reset_timer(struct sock *sk, struct timer_list* timer, | |
2328 | unsigned long expires) | |
2329 | { | |
2330 | if (!mod_timer(timer, expires)) | |
2331 | sock_hold(sk); | |
2332 | } | |
1da177e4 LT |
2333 | EXPORT_SYMBOL(sk_reset_timer); |
2334 | ||
2335 | void sk_stop_timer(struct sock *sk, struct timer_list* timer) | |
2336 | { | |
25cc4ae9 | 2337 | if (del_timer(timer)) |
1da177e4 LT |
2338 | __sock_put(sk); |
2339 | } | |
1da177e4 LT |
2340 | EXPORT_SYMBOL(sk_stop_timer); |
2341 | ||
2342 | void sock_init_data(struct socket *sock, struct sock *sk) | |
2343 | { | |
2344 | skb_queue_head_init(&sk->sk_receive_queue); | |
2345 | skb_queue_head_init(&sk->sk_write_queue); | |
2346 | skb_queue_head_init(&sk->sk_error_queue); | |
2347 | ||
2348 | sk->sk_send_head = NULL; | |
2349 | ||
2350 | init_timer(&sk->sk_timer); | |
4ec93edb | 2351 | |
1da177e4 LT |
2352 | sk->sk_allocation = GFP_KERNEL; |
2353 | sk->sk_rcvbuf = sysctl_rmem_default; | |
2354 | sk->sk_sndbuf = sysctl_wmem_default; | |
2355 | sk->sk_state = TCP_CLOSE; | |
972692e0 | 2356 | sk_set_socket(sk, sock); |
1da177e4 LT |
2357 | |
2358 | sock_set_flag(sk, SOCK_ZAPPED); | |
2359 | ||
e71a4783 | 2360 | if (sock) { |
1da177e4 | 2361 | sk->sk_type = sock->type; |
43815482 | 2362 | sk->sk_wq = sock->wq; |
1da177e4 LT |
2363 | sock->sk = sk; |
2364 | } else | |
43815482 | 2365 | sk->sk_wq = NULL; |
1da177e4 | 2366 | |
1da177e4 | 2367 | rwlock_init(&sk->sk_callback_lock); |
443aef0e PZ |
2368 | lockdep_set_class_and_name(&sk->sk_callback_lock, |
2369 | af_callback_keys + sk->sk_family, | |
2370 | af_family_clock_key_strings[sk->sk_family]); | |
1da177e4 LT |
2371 | |
2372 | sk->sk_state_change = sock_def_wakeup; | |
2373 | sk->sk_data_ready = sock_def_readable; | |
2374 | sk->sk_write_space = sock_def_write_space; | |
2375 | sk->sk_error_report = sock_def_error_report; | |
2376 | sk->sk_destruct = sock_def_destruct; | |
2377 | ||
5640f768 ED |
2378 | sk->sk_frag.page = NULL; |
2379 | sk->sk_frag.offset = 0; | |
ef64a54f | 2380 | sk->sk_peek_off = -1; |
1da177e4 | 2381 | |
109f6e39 EB |
2382 | sk->sk_peer_pid = NULL; |
2383 | sk->sk_peer_cred = NULL; | |
1da177e4 LT |
2384 | sk->sk_write_pending = 0; |
2385 | sk->sk_rcvlowat = 1; | |
2386 | sk->sk_rcvtimeo = MAX_SCHEDULE_TIMEOUT; | |
2387 | sk->sk_sndtimeo = MAX_SCHEDULE_TIMEOUT; | |
2388 | ||
f37f0afb | 2389 | sk->sk_stamp = ktime_set(-1L, 0); |
1da177e4 | 2390 | |
e0d1095a | 2391 | #ifdef CONFIG_NET_RX_BUSY_POLL |
06021292 | 2392 | sk->sk_napi_id = 0; |
64b0dc51 | 2393 | sk->sk_ll_usec = sysctl_net_busy_read; |
06021292 ET |
2394 | #endif |
2395 | ||
62748f32 | 2396 | sk->sk_max_pacing_rate = ~0U; |
7eec4174 | 2397 | sk->sk_pacing_rate = ~0U; |
70da268b | 2398 | sk->sk_incoming_cpu = -1; |
4dc6dc71 ED |
2399 | /* |
2400 | * Before updating sk_refcnt, we must commit prior changes to memory | |
2401 | * (Documentation/RCU/rculist_nulls.txt for details) | |
2402 | */ | |
2403 | smp_wmb(); | |
1da177e4 | 2404 | atomic_set(&sk->sk_refcnt, 1); |
33c732c3 | 2405 | atomic_set(&sk->sk_drops, 0); |
1da177e4 | 2406 | } |
2a91525c | 2407 | EXPORT_SYMBOL(sock_init_data); |
1da177e4 | 2408 | |
b5606c2d | 2409 | void lock_sock_nested(struct sock *sk, int subclass) |
1da177e4 LT |
2410 | { |
2411 | might_sleep(); | |
a5b5bb9a | 2412 | spin_lock_bh(&sk->sk_lock.slock); |
d2e9117c | 2413 | if (sk->sk_lock.owned) |
1da177e4 | 2414 | __lock_sock(sk); |
d2e9117c | 2415 | sk->sk_lock.owned = 1; |
a5b5bb9a IM |
2416 | spin_unlock(&sk->sk_lock.slock); |
2417 | /* | |
2418 | * The sk_lock has mutex_lock() semantics here: | |
2419 | */ | |
fcc70d5f | 2420 | mutex_acquire(&sk->sk_lock.dep_map, subclass, 0, _RET_IP_); |
a5b5bb9a | 2421 | local_bh_enable(); |
1da177e4 | 2422 | } |
fcc70d5f | 2423 | EXPORT_SYMBOL(lock_sock_nested); |
1da177e4 | 2424 | |
b5606c2d | 2425 | void release_sock(struct sock *sk) |
1da177e4 | 2426 | { |
a5b5bb9a IM |
2427 | /* |
2428 | * The sk_lock has mutex_unlock() semantics: | |
2429 | */ | |
2430 | mutex_release(&sk->sk_lock.dep_map, 1, _RET_IP_); | |
2431 | ||
2432 | spin_lock_bh(&sk->sk_lock.slock); | |
1da177e4 LT |
2433 | if (sk->sk_backlog.tail) |
2434 | __release_sock(sk); | |
46d3ceab | 2435 | |
c3f9b018 ED |
2436 | /* Warning : release_cb() might need to release sk ownership, |
2437 | * ie call sock_release_ownership(sk) before us. | |
2438 | */ | |
46d3ceab ED |
2439 | if (sk->sk_prot->release_cb) |
2440 | sk->sk_prot->release_cb(sk); | |
2441 | ||
c3f9b018 | 2442 | sock_release_ownership(sk); |
a5b5bb9a IM |
2443 | if (waitqueue_active(&sk->sk_lock.wq)) |
2444 | wake_up(&sk->sk_lock.wq); | |
2445 | spin_unlock_bh(&sk->sk_lock.slock); | |
1da177e4 LT |
2446 | } |
2447 | EXPORT_SYMBOL(release_sock); | |
2448 | ||
8a74ad60 ED |
2449 | /** |
2450 | * lock_sock_fast - fast version of lock_sock | |
2451 | * @sk: socket | |
2452 | * | |
2453 | * This version should be used for very small section, where process wont block | |
2454 | * return false if fast path is taken | |
2455 | * sk_lock.slock locked, owned = 0, BH disabled | |
2456 | * return true if slow path is taken | |
2457 | * sk_lock.slock unlocked, owned = 1, BH enabled | |
2458 | */ | |
2459 | bool lock_sock_fast(struct sock *sk) | |
2460 | { | |
2461 | might_sleep(); | |
2462 | spin_lock_bh(&sk->sk_lock.slock); | |
2463 | ||
2464 | if (!sk->sk_lock.owned) | |
2465 | /* | |
2466 | * Note : We must disable BH | |
2467 | */ | |
2468 | return false; | |
2469 | ||
2470 | __lock_sock(sk); | |
2471 | sk->sk_lock.owned = 1; | |
2472 | spin_unlock(&sk->sk_lock.slock); | |
2473 | /* | |
2474 | * The sk_lock has mutex_lock() semantics here: | |
2475 | */ | |
2476 | mutex_acquire(&sk->sk_lock.dep_map, 0, 0, _RET_IP_); | |
2477 | local_bh_enable(); | |
2478 | return true; | |
2479 | } | |
2480 | EXPORT_SYMBOL(lock_sock_fast); | |
2481 | ||
1da177e4 | 2482 | int sock_get_timestamp(struct sock *sk, struct timeval __user *userstamp) |
4ec93edb | 2483 | { |
b7aa0bf7 | 2484 | struct timeval tv; |
1da177e4 | 2485 | if (!sock_flag(sk, SOCK_TIMESTAMP)) |
20d49473 | 2486 | sock_enable_timestamp(sk, SOCK_TIMESTAMP); |
b7aa0bf7 ED |
2487 | tv = ktime_to_timeval(sk->sk_stamp); |
2488 | if (tv.tv_sec == -1) | |
1da177e4 | 2489 | return -ENOENT; |
b7aa0bf7 ED |
2490 | if (tv.tv_sec == 0) { |
2491 | sk->sk_stamp = ktime_get_real(); | |
2492 | tv = ktime_to_timeval(sk->sk_stamp); | |
2493 | } | |
2494 | return copy_to_user(userstamp, &tv, sizeof(tv)) ? -EFAULT : 0; | |
4ec93edb | 2495 | } |
1da177e4 LT |
2496 | EXPORT_SYMBOL(sock_get_timestamp); |
2497 | ||
ae40eb1e ED |
2498 | int sock_get_timestampns(struct sock *sk, struct timespec __user *userstamp) |
2499 | { | |
2500 | struct timespec ts; | |
2501 | if (!sock_flag(sk, SOCK_TIMESTAMP)) | |
20d49473 | 2502 | sock_enable_timestamp(sk, SOCK_TIMESTAMP); |
ae40eb1e ED |
2503 | ts = ktime_to_timespec(sk->sk_stamp); |
2504 | if (ts.tv_sec == -1) | |
2505 | return -ENOENT; | |
2506 | if (ts.tv_sec == 0) { | |
2507 | sk->sk_stamp = ktime_get_real(); | |
2508 | ts = ktime_to_timespec(sk->sk_stamp); | |
2509 | } | |
2510 | return copy_to_user(userstamp, &ts, sizeof(ts)) ? -EFAULT : 0; | |
2511 | } | |
2512 | EXPORT_SYMBOL(sock_get_timestampns); | |
2513 | ||
20d49473 | 2514 | void sock_enable_timestamp(struct sock *sk, int flag) |
4ec93edb | 2515 | { |
20d49473 | 2516 | if (!sock_flag(sk, flag)) { |
08e29af3 ED |
2517 | unsigned long previous_flags = sk->sk_flags; |
2518 | ||
20d49473 PO |
2519 | sock_set_flag(sk, flag); |
2520 | /* | |
2521 | * we just set one of the two flags which require net | |
2522 | * time stamping, but time stamping might have been on | |
2523 | * already because of the other one | |
2524 | */ | |
080a270f HFS |
2525 | if (sock_needs_netstamp(sk) && |
2526 | !(previous_flags & SK_FLAGS_TIMESTAMP)) | |
20d49473 | 2527 | net_enable_timestamp(); |
1da177e4 LT |
2528 | } |
2529 | } | |
1da177e4 | 2530 | |
cb820f8e RC |
2531 | int sock_recv_errqueue(struct sock *sk, struct msghdr *msg, int len, |
2532 | int level, int type) | |
2533 | { | |
2534 | struct sock_exterr_skb *serr; | |
364a9e93 | 2535 | struct sk_buff *skb; |
cb820f8e RC |
2536 | int copied, err; |
2537 | ||
2538 | err = -EAGAIN; | |
364a9e93 | 2539 | skb = sock_dequeue_err_skb(sk); |
cb820f8e RC |
2540 | if (skb == NULL) |
2541 | goto out; | |
2542 | ||
2543 | copied = skb->len; | |
2544 | if (copied > len) { | |
2545 | msg->msg_flags |= MSG_TRUNC; | |
2546 | copied = len; | |
2547 | } | |
51f3d02b | 2548 | err = skb_copy_datagram_msg(skb, 0, msg, copied); |
cb820f8e RC |
2549 | if (err) |
2550 | goto out_free_skb; | |
2551 | ||
2552 | sock_recv_timestamp(msg, sk, skb); | |
2553 | ||
2554 | serr = SKB_EXT_ERR(skb); | |
2555 | put_cmsg(msg, level, type, sizeof(serr->ee), &serr->ee); | |
2556 | ||
2557 | msg->msg_flags |= MSG_ERRQUEUE; | |
2558 | err = copied; | |
2559 | ||
cb820f8e RC |
2560 | out_free_skb: |
2561 | kfree_skb(skb); | |
2562 | out: | |
2563 | return err; | |
2564 | } | |
2565 | EXPORT_SYMBOL(sock_recv_errqueue); | |
2566 | ||
1da177e4 LT |
2567 | /* |
2568 | * Get a socket option on an socket. | |
2569 | * | |
2570 | * FIX: POSIX 1003.1g is very ambiguous here. It states that | |
2571 | * asynchronous errors should be reported by getsockopt. We assume | |
2572 | * this means if you specify SO_ERROR (otherwise whats the point of it). | |
2573 | */ | |
2574 | int sock_common_getsockopt(struct socket *sock, int level, int optname, | |
2575 | char __user *optval, int __user *optlen) | |
2576 | { | |
2577 | struct sock *sk = sock->sk; | |
2578 | ||
2579 | return sk->sk_prot->getsockopt(sk, level, optname, optval, optlen); | |
2580 | } | |
1da177e4 LT |
2581 | EXPORT_SYMBOL(sock_common_getsockopt); |
2582 | ||
3fdadf7d | 2583 | #ifdef CONFIG_COMPAT |
543d9cfe ACM |
2584 | int compat_sock_common_getsockopt(struct socket *sock, int level, int optname, |
2585 | char __user *optval, int __user *optlen) | |
3fdadf7d DM |
2586 | { |
2587 | struct sock *sk = sock->sk; | |
2588 | ||
1e51f951 | 2589 | if (sk->sk_prot->compat_getsockopt != NULL) |
543d9cfe ACM |
2590 | return sk->sk_prot->compat_getsockopt(sk, level, optname, |
2591 | optval, optlen); | |
3fdadf7d DM |
2592 | return sk->sk_prot->getsockopt(sk, level, optname, optval, optlen); |
2593 | } | |
2594 | EXPORT_SYMBOL(compat_sock_common_getsockopt); | |
2595 | #endif | |
2596 | ||
1b784140 YX |
2597 | int sock_common_recvmsg(struct socket *sock, struct msghdr *msg, size_t size, |
2598 | int flags) | |
1da177e4 LT |
2599 | { |
2600 | struct sock *sk = sock->sk; | |
2601 | int addr_len = 0; | |
2602 | int err; | |
2603 | ||
1b784140 | 2604 | err = sk->sk_prot->recvmsg(sk, msg, size, flags & MSG_DONTWAIT, |
1da177e4 LT |
2605 | flags & ~MSG_DONTWAIT, &addr_len); |
2606 | if (err >= 0) | |
2607 | msg->msg_namelen = addr_len; | |
2608 | return err; | |
2609 | } | |
1da177e4 LT |
2610 | EXPORT_SYMBOL(sock_common_recvmsg); |
2611 | ||
2612 | /* | |
2613 | * Set socket options on an inet socket. | |
2614 | */ | |
2615 | int sock_common_setsockopt(struct socket *sock, int level, int optname, | |
b7058842 | 2616 | char __user *optval, unsigned int optlen) |
1da177e4 LT |
2617 | { |
2618 | struct sock *sk = sock->sk; | |
2619 | ||
2620 | return sk->sk_prot->setsockopt(sk, level, optname, optval, optlen); | |
2621 | } | |
1da177e4 LT |
2622 | EXPORT_SYMBOL(sock_common_setsockopt); |
2623 | ||
3fdadf7d | 2624 | #ifdef CONFIG_COMPAT |
543d9cfe | 2625 | int compat_sock_common_setsockopt(struct socket *sock, int level, int optname, |
b7058842 | 2626 | char __user *optval, unsigned int optlen) |
3fdadf7d DM |
2627 | { |
2628 | struct sock *sk = sock->sk; | |
2629 | ||
543d9cfe ACM |
2630 | if (sk->sk_prot->compat_setsockopt != NULL) |
2631 | return sk->sk_prot->compat_setsockopt(sk, level, optname, | |
2632 | optval, optlen); | |
3fdadf7d DM |
2633 | return sk->sk_prot->setsockopt(sk, level, optname, optval, optlen); |
2634 | } | |
2635 | EXPORT_SYMBOL(compat_sock_common_setsockopt); | |
2636 | #endif | |
2637 | ||
1da177e4 LT |
2638 | void sk_common_release(struct sock *sk) |
2639 | { | |
2640 | if (sk->sk_prot->destroy) | |
2641 | sk->sk_prot->destroy(sk); | |
2642 | ||
2643 | /* | |
2644 | * Observation: when sock_common_release is called, processes have | |
2645 | * no access to socket. But net still has. | |
2646 | * Step one, detach it from networking: | |
2647 | * | |
2648 | * A. Remove from hash tables. | |
2649 | */ | |
2650 | ||
2651 | sk->sk_prot->unhash(sk); | |
2652 | ||
2653 | /* | |
2654 | * In this point socket cannot receive new packets, but it is possible | |
2655 | * that some packets are in flight because some CPU runs receiver and | |
2656 | * did hash table lookup before we unhashed socket. They will achieve | |
2657 | * receive queue and will be purged by socket destructor. | |
2658 | * | |
2659 | * Also we still have packets pending on receive queue and probably, | |
2660 | * our own packets waiting in device queues. sock_destroy will drain | |
2661 | * receive queue, but transmitted packets will delay socket destruction | |
2662 | * until the last reference will be released. | |
2663 | */ | |
2664 | ||
2665 | sock_orphan(sk); | |
2666 | ||
2667 | xfrm_sk_free_policy(sk); | |
2668 | ||
e6848976 | 2669 | sk_refcnt_debug_release(sk); |
5640f768 ED |
2670 | |
2671 | if (sk->sk_frag.page) { | |
2672 | put_page(sk->sk_frag.page); | |
2673 | sk->sk_frag.page = NULL; | |
2674 | } | |
2675 | ||
1da177e4 LT |
2676 | sock_put(sk); |
2677 | } | |
1da177e4 LT |
2678 | EXPORT_SYMBOL(sk_common_release); |
2679 | ||
13ff3d6f PE |
2680 | #ifdef CONFIG_PROC_FS |
2681 | #define PROTO_INUSE_NR 64 /* should be enough for the first time */ | |
1338d466 PE |
2682 | struct prot_inuse { |
2683 | int val[PROTO_INUSE_NR]; | |
2684 | }; | |
13ff3d6f PE |
2685 | |
2686 | static DECLARE_BITMAP(proto_inuse_idx, PROTO_INUSE_NR); | |
70ee1159 PE |
2687 | |
2688 | #ifdef CONFIG_NET_NS | |
2689 | void sock_prot_inuse_add(struct net *net, struct proto *prot, int val) | |
2690 | { | |
d6d9ca0f | 2691 | __this_cpu_add(net->core.inuse->val[prot->inuse_idx], val); |
70ee1159 PE |
2692 | } |
2693 | EXPORT_SYMBOL_GPL(sock_prot_inuse_add); | |
2694 | ||
2695 | int sock_prot_inuse_get(struct net *net, struct proto *prot) | |
2696 | { | |
2697 | int cpu, idx = prot->inuse_idx; | |
2698 | int res = 0; | |
2699 | ||
2700 | for_each_possible_cpu(cpu) | |
2701 | res += per_cpu_ptr(net->core.inuse, cpu)->val[idx]; | |
2702 | ||
2703 | return res >= 0 ? res : 0; | |
2704 | } | |
2705 | EXPORT_SYMBOL_GPL(sock_prot_inuse_get); | |
2706 | ||
2c8c1e72 | 2707 | static int __net_init sock_inuse_init_net(struct net *net) |
70ee1159 PE |
2708 | { |
2709 | net->core.inuse = alloc_percpu(struct prot_inuse); | |
2710 | return net->core.inuse ? 0 : -ENOMEM; | |
2711 | } | |
2712 | ||
2c8c1e72 | 2713 | static void __net_exit sock_inuse_exit_net(struct net *net) |
70ee1159 PE |
2714 | { |
2715 | free_percpu(net->core.inuse); | |
2716 | } | |
2717 | ||
2718 | static struct pernet_operations net_inuse_ops = { | |
2719 | .init = sock_inuse_init_net, | |
2720 | .exit = sock_inuse_exit_net, | |
2721 | }; | |
2722 | ||
2723 | static __init int net_inuse_init(void) | |
2724 | { | |
2725 | if (register_pernet_subsys(&net_inuse_ops)) | |
2726 | panic("Cannot initialize net inuse counters"); | |
2727 | ||
2728 | return 0; | |
2729 | } | |
2730 | ||
2731 | core_initcall(net_inuse_init); | |
2732 | #else | |
1338d466 PE |
2733 | static DEFINE_PER_CPU(struct prot_inuse, prot_inuse); |
2734 | ||
c29a0bc4 | 2735 | void sock_prot_inuse_add(struct net *net, struct proto *prot, int val) |
1338d466 | 2736 | { |
d6d9ca0f | 2737 | __this_cpu_add(prot_inuse.val[prot->inuse_idx], val); |
1338d466 PE |
2738 | } |
2739 | EXPORT_SYMBOL_GPL(sock_prot_inuse_add); | |
2740 | ||
c29a0bc4 | 2741 | int sock_prot_inuse_get(struct net *net, struct proto *prot) |
1338d466 PE |
2742 | { |
2743 | int cpu, idx = prot->inuse_idx; | |
2744 | int res = 0; | |
2745 | ||
2746 | for_each_possible_cpu(cpu) | |
2747 | res += per_cpu(prot_inuse, cpu).val[idx]; | |
2748 | ||
2749 | return res >= 0 ? res : 0; | |
2750 | } | |
2751 | EXPORT_SYMBOL_GPL(sock_prot_inuse_get); | |
70ee1159 | 2752 | #endif |
13ff3d6f PE |
2753 | |
2754 | static void assign_proto_idx(struct proto *prot) | |
2755 | { | |
2756 | prot->inuse_idx = find_first_zero_bit(proto_inuse_idx, PROTO_INUSE_NR); | |
2757 | ||
2758 | if (unlikely(prot->inuse_idx == PROTO_INUSE_NR - 1)) { | |
e005d193 | 2759 | pr_err("PROTO_INUSE_NR exhausted\n"); |
13ff3d6f PE |
2760 | return; |
2761 | } | |
2762 | ||
2763 | set_bit(prot->inuse_idx, proto_inuse_idx); | |
2764 | } | |
2765 | ||
2766 | static void release_proto_idx(struct proto *prot) | |
2767 | { | |
2768 | if (prot->inuse_idx != PROTO_INUSE_NR - 1) | |
2769 | clear_bit(prot->inuse_idx, proto_inuse_idx); | |
2770 | } | |
2771 | #else | |
2772 | static inline void assign_proto_idx(struct proto *prot) | |
2773 | { | |
2774 | } | |
2775 | ||
2776 | static inline void release_proto_idx(struct proto *prot) | |
2777 | { | |
2778 | } | |
2779 | #endif | |
2780 | ||
0159dfd3 ED |
2781 | static void req_prot_cleanup(struct request_sock_ops *rsk_prot) |
2782 | { | |
2783 | if (!rsk_prot) | |
2784 | return; | |
2785 | kfree(rsk_prot->slab_name); | |
2786 | rsk_prot->slab_name = NULL; | |
adf78eda JL |
2787 | kmem_cache_destroy(rsk_prot->slab); |
2788 | rsk_prot->slab = NULL; | |
0159dfd3 ED |
2789 | } |
2790 | ||
2791 | static int req_prot_init(const struct proto *prot) | |
2792 | { | |
2793 | struct request_sock_ops *rsk_prot = prot->rsk_prot; | |
2794 | ||
2795 | if (!rsk_prot) | |
2796 | return 0; | |
2797 | ||
2798 | rsk_prot->slab_name = kasprintf(GFP_KERNEL, "request_sock_%s", | |
2799 | prot->name); | |
2800 | if (!rsk_prot->slab_name) | |
2801 | return -ENOMEM; | |
2802 | ||
2803 | rsk_prot->slab = kmem_cache_create(rsk_prot->slab_name, | |
2804 | rsk_prot->obj_size, 0, | |
e96f78ab | 2805 | prot->slab_flags, NULL); |
0159dfd3 ED |
2806 | |
2807 | if (!rsk_prot->slab) { | |
2808 | pr_crit("%s: Can't create request sock SLAB cache!\n", | |
2809 | prot->name); | |
2810 | return -ENOMEM; | |
2811 | } | |
2812 | return 0; | |
2813 | } | |
2814 | ||
b733c007 PE |
2815 | int proto_register(struct proto *prot, int alloc_slab) |
2816 | { | |
1da177e4 LT |
2817 | if (alloc_slab) { |
2818 | prot->slab = kmem_cache_create(prot->name, prot->obj_size, 0, | |
271b72c7 ED |
2819 | SLAB_HWCACHE_ALIGN | prot->slab_flags, |
2820 | NULL); | |
1da177e4 LT |
2821 | |
2822 | if (prot->slab == NULL) { | |
e005d193 JP |
2823 | pr_crit("%s: Can't create sock SLAB cache!\n", |
2824 | prot->name); | |
60e7663d | 2825 | goto out; |
1da177e4 | 2826 | } |
2e6599cb | 2827 | |
0159dfd3 ED |
2828 | if (req_prot_init(prot)) |
2829 | goto out_free_request_sock_slab; | |
8feaf0c0 | 2830 | |
6d6ee43e | 2831 | if (prot->twsk_prot != NULL) { |
faf23422 | 2832 | prot->twsk_prot->twsk_slab_name = kasprintf(GFP_KERNEL, "tw_sock_%s", prot->name); |
8feaf0c0 | 2833 | |
7e56b5d6 | 2834 | if (prot->twsk_prot->twsk_slab_name == NULL) |
8feaf0c0 ACM |
2835 | goto out_free_request_sock_slab; |
2836 | ||
6d6ee43e | 2837 | prot->twsk_prot->twsk_slab = |
7e56b5d6 | 2838 | kmem_cache_create(prot->twsk_prot->twsk_slab_name, |
6d6ee43e | 2839 | prot->twsk_prot->twsk_obj_size, |
3ab5aee7 | 2840 | 0, |
52db70dc | 2841 | prot->slab_flags, |
20c2df83 | 2842 | NULL); |
6d6ee43e | 2843 | if (prot->twsk_prot->twsk_slab == NULL) |
8feaf0c0 ACM |
2844 | goto out_free_timewait_sock_slab_name; |
2845 | } | |
1da177e4 LT |
2846 | } |
2847 | ||
36b77a52 | 2848 | mutex_lock(&proto_list_mutex); |
1da177e4 | 2849 | list_add(&prot->node, &proto_list); |
13ff3d6f | 2850 | assign_proto_idx(prot); |
36b77a52 | 2851 | mutex_unlock(&proto_list_mutex); |
b733c007 PE |
2852 | return 0; |
2853 | ||
8feaf0c0 | 2854 | out_free_timewait_sock_slab_name: |
7e56b5d6 | 2855 | kfree(prot->twsk_prot->twsk_slab_name); |
8feaf0c0 | 2856 | out_free_request_sock_slab: |
0159dfd3 ED |
2857 | req_prot_cleanup(prot->rsk_prot); |
2858 | ||
2e6599cb ACM |
2859 | kmem_cache_destroy(prot->slab); |
2860 | prot->slab = NULL; | |
b733c007 PE |
2861 | out: |
2862 | return -ENOBUFS; | |
1da177e4 | 2863 | } |
1da177e4 LT |
2864 | EXPORT_SYMBOL(proto_register); |
2865 | ||
2866 | void proto_unregister(struct proto *prot) | |
2867 | { | |
36b77a52 | 2868 | mutex_lock(&proto_list_mutex); |
13ff3d6f | 2869 | release_proto_idx(prot); |
0a3f4358 | 2870 | list_del(&prot->node); |
36b77a52 | 2871 | mutex_unlock(&proto_list_mutex); |
1da177e4 | 2872 | |
adf78eda JL |
2873 | kmem_cache_destroy(prot->slab); |
2874 | prot->slab = NULL; | |
1da177e4 | 2875 | |
0159dfd3 | 2876 | req_prot_cleanup(prot->rsk_prot); |
2e6599cb | 2877 | |
6d6ee43e | 2878 | if (prot->twsk_prot != NULL && prot->twsk_prot->twsk_slab != NULL) { |
6d6ee43e | 2879 | kmem_cache_destroy(prot->twsk_prot->twsk_slab); |
7e56b5d6 | 2880 | kfree(prot->twsk_prot->twsk_slab_name); |
6d6ee43e | 2881 | prot->twsk_prot->twsk_slab = NULL; |
8feaf0c0 | 2882 | } |
1da177e4 | 2883 | } |
1da177e4 LT |
2884 | EXPORT_SYMBOL(proto_unregister); |
2885 | ||
2886 | #ifdef CONFIG_PROC_FS | |
1da177e4 | 2887 | static void *proto_seq_start(struct seq_file *seq, loff_t *pos) |
36b77a52 | 2888 | __acquires(proto_list_mutex) |
1da177e4 | 2889 | { |
36b77a52 | 2890 | mutex_lock(&proto_list_mutex); |
60f0438a | 2891 | return seq_list_start_head(&proto_list, *pos); |
1da177e4 LT |
2892 | } |
2893 | ||
2894 | static void *proto_seq_next(struct seq_file *seq, void *v, loff_t *pos) | |
2895 | { | |
60f0438a | 2896 | return seq_list_next(v, &proto_list, pos); |
1da177e4 LT |
2897 | } |
2898 | ||
2899 | static void proto_seq_stop(struct seq_file *seq, void *v) | |
36b77a52 | 2900 | __releases(proto_list_mutex) |
1da177e4 | 2901 | { |
36b77a52 | 2902 | mutex_unlock(&proto_list_mutex); |
1da177e4 LT |
2903 | } |
2904 | ||
2905 | static char proto_method_implemented(const void *method) | |
2906 | { | |
2907 | return method == NULL ? 'n' : 'y'; | |
2908 | } | |
180d8cd9 GC |
2909 | static long sock_prot_memory_allocated(struct proto *proto) |
2910 | { | |
cb75a36c | 2911 | return proto->memory_allocated != NULL ? proto_memory_allocated(proto) : -1L; |
180d8cd9 GC |
2912 | } |
2913 | ||
2914 | static char *sock_prot_memory_pressure(struct proto *proto) | |
2915 | { | |
2916 | return proto->memory_pressure != NULL ? | |
2917 | proto_memory_pressure(proto) ? "yes" : "no" : "NI"; | |
2918 | } | |
1da177e4 LT |
2919 | |
2920 | static void proto_seq_printf(struct seq_file *seq, struct proto *proto) | |
2921 | { | |
180d8cd9 | 2922 | |
8d987e5c | 2923 | seq_printf(seq, "%-9s %4u %6d %6ld %-3s %6u %-3s %-10s " |
1da177e4 LT |
2924 | "%2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c\n", |
2925 | proto->name, | |
2926 | proto->obj_size, | |
14e943db | 2927 | sock_prot_inuse_get(seq_file_net(seq), proto), |
180d8cd9 GC |
2928 | sock_prot_memory_allocated(proto), |
2929 | sock_prot_memory_pressure(proto), | |
1da177e4 LT |
2930 | proto->max_header, |
2931 | proto->slab == NULL ? "no" : "yes", | |
2932 | module_name(proto->owner), | |
2933 | proto_method_implemented(proto->close), | |
2934 | proto_method_implemented(proto->connect), | |
2935 | proto_method_implemented(proto->disconnect), | |
2936 | proto_method_implemented(proto->accept), | |
2937 | proto_method_implemented(proto->ioctl), | |
2938 | proto_method_implemented(proto->init), | |
2939 | proto_method_implemented(proto->destroy), | |
2940 | proto_method_implemented(proto->shutdown), | |
2941 | proto_method_implemented(proto->setsockopt), | |
2942 | proto_method_implemented(proto->getsockopt), | |
2943 | proto_method_implemented(proto->sendmsg), | |
2944 | proto_method_implemented(proto->recvmsg), | |
2945 | proto_method_implemented(proto->sendpage), | |
2946 | proto_method_implemented(proto->bind), | |
2947 | proto_method_implemented(proto->backlog_rcv), | |
2948 | proto_method_implemented(proto->hash), | |
2949 | proto_method_implemented(proto->unhash), | |
2950 | proto_method_implemented(proto->get_port), | |
2951 | proto_method_implemented(proto->enter_memory_pressure)); | |
2952 | } | |
2953 | ||
2954 | static int proto_seq_show(struct seq_file *seq, void *v) | |
2955 | { | |
60f0438a | 2956 | if (v == &proto_list) |
1da177e4 LT |
2957 | seq_printf(seq, "%-9s %-4s %-8s %-6s %-5s %-7s %-4s %-10s %s", |
2958 | "protocol", | |
2959 | "size", | |
2960 | "sockets", | |
2961 | "memory", | |
2962 | "press", | |
2963 | "maxhdr", | |
2964 | "slab", | |
2965 | "module", | |
2966 | "cl co di ac io in de sh ss gs se re sp bi br ha uh gp em\n"); | |
2967 | else | |
60f0438a | 2968 | proto_seq_printf(seq, list_entry(v, struct proto, node)); |
1da177e4 LT |
2969 | return 0; |
2970 | } | |
2971 | ||
f690808e | 2972 | static const struct seq_operations proto_seq_ops = { |
1da177e4 LT |
2973 | .start = proto_seq_start, |
2974 | .next = proto_seq_next, | |
2975 | .stop = proto_seq_stop, | |
2976 | .show = proto_seq_show, | |
2977 | }; | |
2978 | ||
2979 | static int proto_seq_open(struct inode *inode, struct file *file) | |
2980 | { | |
14e943db ED |
2981 | return seq_open_net(inode, file, &proto_seq_ops, |
2982 | sizeof(struct seq_net_private)); | |
1da177e4 LT |
2983 | } |
2984 | ||
9a32144e | 2985 | static const struct file_operations proto_seq_fops = { |
1da177e4 LT |
2986 | .owner = THIS_MODULE, |
2987 | .open = proto_seq_open, | |
2988 | .read = seq_read, | |
2989 | .llseek = seq_lseek, | |
14e943db ED |
2990 | .release = seq_release_net, |
2991 | }; | |
2992 | ||
2993 | static __net_init int proto_init_net(struct net *net) | |
2994 | { | |
d4beaa66 | 2995 | if (!proc_create("protocols", S_IRUGO, net->proc_net, &proto_seq_fops)) |
14e943db ED |
2996 | return -ENOMEM; |
2997 | ||
2998 | return 0; | |
2999 | } | |
3000 | ||
3001 | static __net_exit void proto_exit_net(struct net *net) | |
3002 | { | |
ece31ffd | 3003 | remove_proc_entry("protocols", net->proc_net); |
14e943db ED |
3004 | } |
3005 | ||
3006 | ||
3007 | static __net_initdata struct pernet_operations proto_net_ops = { | |
3008 | .init = proto_init_net, | |
3009 | .exit = proto_exit_net, | |
1da177e4 LT |
3010 | }; |
3011 | ||
3012 | static int __init proto_init(void) | |
3013 | { | |
14e943db | 3014 | return register_pernet_subsys(&proto_net_ops); |
1da177e4 LT |
3015 | } |
3016 | ||
3017 | subsys_initcall(proto_init); | |
3018 | ||
3019 | #endif /* PROC_FS */ |