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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 | ||
80b14dee | 94 | #include <asm/unaligned.h> |
4fc268d2 | 95 | #include <linux/capability.h> |
1da177e4 | 96 | #include <linux/errno.h> |
cb820f8e | 97 | #include <linux/errqueue.h> |
1da177e4 LT |
98 | #include <linux/types.h> |
99 | #include <linux/socket.h> | |
100 | #include <linux/in.h> | |
101 | #include <linux/kernel.h> | |
1da177e4 LT |
102 | #include <linux/module.h> |
103 | #include <linux/proc_fs.h> | |
104 | #include <linux/seq_file.h> | |
105 | #include <linux/sched.h> | |
f1083048 | 106 | #include <linux/sched/mm.h> |
1da177e4 LT |
107 | #include <linux/timer.h> |
108 | #include <linux/string.h> | |
109 | #include <linux/sockios.h> | |
110 | #include <linux/net.h> | |
111 | #include <linux/mm.h> | |
112 | #include <linux/slab.h> | |
113 | #include <linux/interrupt.h> | |
114 | #include <linux/poll.h> | |
115 | #include <linux/tcp.h> | |
116 | #include <linux/init.h> | |
a1f8e7f7 | 117 | #include <linux/highmem.h> |
3f551f94 | 118 | #include <linux/user_namespace.h> |
c5905afb | 119 | #include <linux/static_key.h> |
3969eb38 | 120 | #include <linux/memcontrol.h> |
8c1ae10d | 121 | #include <linux/prefetch.h> |
1da177e4 | 122 | |
7c0f6ba6 | 123 | #include <linux/uaccess.h> |
1da177e4 LT |
124 | |
125 | #include <linux/netdevice.h> | |
126 | #include <net/protocol.h> | |
127 | #include <linux/skbuff.h> | |
457c4cbc | 128 | #include <net/net_namespace.h> |
2e6599cb | 129 | #include <net/request_sock.h> |
1da177e4 | 130 | #include <net/sock.h> |
20d49473 | 131 | #include <linux/net_tstamp.h> |
1da177e4 LT |
132 | #include <net/xfrm.h> |
133 | #include <linux/ipsec.h> | |
f8451725 | 134 | #include <net/cls_cgroup.h> |
5bc1421e | 135 | #include <net/netprio_cgroup.h> |
eb4cb008 | 136 | #include <linux/sock_diag.h> |
1da177e4 LT |
137 | |
138 | #include <linux/filter.h> | |
538950a1 | 139 | #include <net/sock_reuseport.h> |
6ac99e8f | 140 | #include <net/bpf_sk_storage.h> |
1da177e4 | 141 | |
3847ce32 SM |
142 | #include <trace/events/sock.h> |
143 | ||
1da177e4 | 144 | #include <net/tcp.h> |
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 | ||
648845ab TZ |
150 | static void sock_inuse_add(struct net *net, int val); |
151 | ||
a3b299da EB |
152 | /** |
153 | * sk_ns_capable - General socket capability test | |
154 | * @sk: Socket to use a capability on or through | |
155 | * @user_ns: The user namespace of the capability to use | |
156 | * @cap: The capability to use | |
157 | * | |
158 | * Test to see if the opener of the socket had when the socket was | |
159 | * created and the current process has the capability @cap in the user | |
160 | * namespace @user_ns. | |
161 | */ | |
162 | bool sk_ns_capable(const struct sock *sk, | |
163 | struct user_namespace *user_ns, int cap) | |
164 | { | |
165 | return file_ns_capable(sk->sk_socket->file, user_ns, cap) && | |
166 | ns_capable(user_ns, cap); | |
167 | } | |
168 | EXPORT_SYMBOL(sk_ns_capable); | |
169 | ||
170 | /** | |
171 | * sk_capable - Socket global capability test | |
172 | * @sk: Socket to use a capability on or through | |
e793c0f7 | 173 | * @cap: The global capability to use |
a3b299da EB |
174 | * |
175 | * Test to see if the opener of the socket had when the socket was | |
176 | * created and the current process has the capability @cap in all user | |
177 | * namespaces. | |
178 | */ | |
179 | bool sk_capable(const struct sock *sk, int cap) | |
180 | { | |
181 | return sk_ns_capable(sk, &init_user_ns, cap); | |
182 | } | |
183 | EXPORT_SYMBOL(sk_capable); | |
184 | ||
185 | /** | |
186 | * sk_net_capable - Network namespace socket capability test | |
187 | * @sk: Socket to use a capability on or through | |
188 | * @cap: The capability to use | |
189 | * | |
e793c0f7 | 190 | * Test to see if the opener of the socket had when the socket was created |
a3b299da EB |
191 | * and the current process has the capability @cap over the network namespace |
192 | * the socket is a member of. | |
193 | */ | |
194 | bool sk_net_capable(const struct sock *sk, int cap) | |
195 | { | |
196 | return sk_ns_capable(sk, sock_net(sk)->user_ns, cap); | |
197 | } | |
198 | EXPORT_SYMBOL(sk_net_capable); | |
199 | ||
da21f24d IM |
200 | /* |
201 | * Each address family might have different locking rules, so we have | |
cdfbabfb DH |
202 | * one slock key per address family and separate keys for internal and |
203 | * userspace sockets. | |
da21f24d | 204 | */ |
a5b5bb9a | 205 | static struct lock_class_key af_family_keys[AF_MAX]; |
cdfbabfb | 206 | static struct lock_class_key af_family_kern_keys[AF_MAX]; |
a5b5bb9a | 207 | static struct lock_class_key af_family_slock_keys[AF_MAX]; |
cdfbabfb | 208 | static struct lock_class_key af_family_kern_slock_keys[AF_MAX]; |
a5b5bb9a | 209 | |
a5b5bb9a IM |
210 | /* |
211 | * Make lock validator output more readable. (we pre-construct these | |
212 | * strings build-time, so that runtime initialization of socket | |
213 | * locks is fast): | |
214 | */ | |
cdfbabfb DH |
215 | |
216 | #define _sock_locks(x) \ | |
217 | x "AF_UNSPEC", x "AF_UNIX" , x "AF_INET" , \ | |
218 | x "AF_AX25" , x "AF_IPX" , x "AF_APPLETALK", \ | |
219 | x "AF_NETROM", x "AF_BRIDGE" , x "AF_ATMPVC" , \ | |
220 | x "AF_X25" , x "AF_INET6" , x "AF_ROSE" , \ | |
221 | x "AF_DECnet", x "AF_NETBEUI" , x "AF_SECURITY" , \ | |
222 | x "AF_KEY" , x "AF_NETLINK" , x "AF_PACKET" , \ | |
223 | x "AF_ASH" , x "AF_ECONET" , x "AF_ATMSVC" , \ | |
224 | x "AF_RDS" , x "AF_SNA" , x "AF_IRDA" , \ | |
225 | x "AF_PPPOX" , x "AF_WANPIPE" , x "AF_LLC" , \ | |
226 | x "27" , x "28" , x "AF_CAN" , \ | |
227 | x "AF_TIPC" , x "AF_BLUETOOTH", x "IUCV" , \ | |
228 | x "AF_RXRPC" , x "AF_ISDN" , x "AF_PHONET" , \ | |
229 | x "AF_IEEE802154", x "AF_CAIF" , x "AF_ALG" , \ | |
230 | x "AF_NFC" , x "AF_VSOCK" , x "AF_KCM" , \ | |
68e8b849 BT |
231 | x "AF_QIPCRTR", x "AF_SMC" , x "AF_XDP" , \ |
232 | x "AF_MAX" | |
cdfbabfb | 233 | |
36cbd3dc | 234 | static const char *const af_family_key_strings[AF_MAX+1] = { |
cdfbabfb | 235 | _sock_locks("sk_lock-") |
a5b5bb9a | 236 | }; |
36cbd3dc | 237 | static const char *const af_family_slock_key_strings[AF_MAX+1] = { |
cdfbabfb | 238 | _sock_locks("slock-") |
a5b5bb9a | 239 | }; |
36cbd3dc | 240 | static const char *const af_family_clock_key_strings[AF_MAX+1] = { |
cdfbabfb DH |
241 | _sock_locks("clock-") |
242 | }; | |
243 | ||
244 | static const char *const af_family_kern_key_strings[AF_MAX+1] = { | |
245 | _sock_locks("k-sk_lock-") | |
246 | }; | |
247 | static const char *const af_family_kern_slock_key_strings[AF_MAX+1] = { | |
248 | _sock_locks("k-slock-") | |
249 | }; | |
250 | static const char *const af_family_kern_clock_key_strings[AF_MAX+1] = { | |
251 | _sock_locks("k-clock-") | |
443aef0e | 252 | }; |
581319c5 | 253 | static const char *const af_family_rlock_key_strings[AF_MAX+1] = { |
6b431d50 | 254 | _sock_locks("rlock-") |
581319c5 PA |
255 | }; |
256 | static const char *const af_family_wlock_key_strings[AF_MAX+1] = { | |
6b431d50 | 257 | _sock_locks("wlock-") |
581319c5 PA |
258 | }; |
259 | static const char *const af_family_elock_key_strings[AF_MAX+1] = { | |
6b431d50 | 260 | _sock_locks("elock-") |
581319c5 | 261 | }; |
da21f24d IM |
262 | |
263 | /* | |
581319c5 | 264 | * sk_callback_lock and sk queues locking rules are per-address-family, |
da21f24d IM |
265 | * so split the lock classes by using a per-AF key: |
266 | */ | |
267 | static struct lock_class_key af_callback_keys[AF_MAX]; | |
581319c5 PA |
268 | static struct lock_class_key af_rlock_keys[AF_MAX]; |
269 | static struct lock_class_key af_wlock_keys[AF_MAX]; | |
270 | static struct lock_class_key af_elock_keys[AF_MAX]; | |
cdfbabfb | 271 | static struct lock_class_key af_kern_callback_keys[AF_MAX]; |
da21f24d | 272 | |
1da177e4 | 273 | /* Run time adjustable parameters. */ |
ab32ea5d | 274 | __u32 sysctl_wmem_max __read_mostly = SK_WMEM_MAX; |
6d8ebc8a | 275 | EXPORT_SYMBOL(sysctl_wmem_max); |
ab32ea5d | 276 | __u32 sysctl_rmem_max __read_mostly = SK_RMEM_MAX; |
6d8ebc8a | 277 | EXPORT_SYMBOL(sysctl_rmem_max); |
ab32ea5d BH |
278 | __u32 sysctl_wmem_default __read_mostly = SK_WMEM_MAX; |
279 | __u32 sysctl_rmem_default __read_mostly = SK_RMEM_MAX; | |
1da177e4 | 280 | |
25985edc | 281 | /* Maximal space eaten by iovec or ancillary data plus some space */ |
ab32ea5d | 282 | int sysctl_optmem_max __read_mostly = sizeof(unsigned long)*(2*UIO_MAXIOV+512); |
2a91525c | 283 | EXPORT_SYMBOL(sysctl_optmem_max); |
1da177e4 | 284 | |
b245be1f WB |
285 | int sysctl_tstamp_allow_data __read_mostly = 1; |
286 | ||
a7950ae8 DB |
287 | DEFINE_STATIC_KEY_FALSE(memalloc_socks_key); |
288 | EXPORT_SYMBOL_GPL(memalloc_socks_key); | |
c93bdd0e | 289 | |
7cb02404 MG |
290 | /** |
291 | * sk_set_memalloc - sets %SOCK_MEMALLOC | |
292 | * @sk: socket to set it on | |
293 | * | |
294 | * Set %SOCK_MEMALLOC on a socket for access to emergency reserves. | |
295 | * It's the responsibility of the admin to adjust min_free_kbytes | |
296 | * to meet the requirements | |
297 | */ | |
298 | void sk_set_memalloc(struct sock *sk) | |
299 | { | |
300 | sock_set_flag(sk, SOCK_MEMALLOC); | |
301 | sk->sk_allocation |= __GFP_MEMALLOC; | |
a7950ae8 | 302 | static_branch_inc(&memalloc_socks_key); |
7cb02404 MG |
303 | } |
304 | EXPORT_SYMBOL_GPL(sk_set_memalloc); | |
305 | ||
306 | void sk_clear_memalloc(struct sock *sk) | |
307 | { | |
308 | sock_reset_flag(sk, SOCK_MEMALLOC); | |
309 | sk->sk_allocation &= ~__GFP_MEMALLOC; | |
a7950ae8 | 310 | static_branch_dec(&memalloc_socks_key); |
c76562b6 MG |
311 | |
312 | /* | |
313 | * SOCK_MEMALLOC is allowed to ignore rmem limits to ensure forward | |
5d753610 MG |
314 | * progress of swapping. SOCK_MEMALLOC may be cleared while |
315 | * it has rmem allocations due to the last swapfile being deactivated | |
316 | * but there is a risk that the socket is unusable due to exceeding | |
317 | * the rmem limits. Reclaim the reserves and obey rmem limits again. | |
c76562b6 | 318 | */ |
5d753610 | 319 | sk_mem_reclaim(sk); |
7cb02404 MG |
320 | } |
321 | EXPORT_SYMBOL_GPL(sk_clear_memalloc); | |
322 | ||
b4b9e355 MG |
323 | int __sk_backlog_rcv(struct sock *sk, struct sk_buff *skb) |
324 | { | |
325 | int ret; | |
f1083048 | 326 | unsigned int noreclaim_flag; |
b4b9e355 MG |
327 | |
328 | /* these should have been dropped before queueing */ | |
329 | BUG_ON(!sock_flag(sk, SOCK_MEMALLOC)); | |
330 | ||
f1083048 | 331 | noreclaim_flag = memalloc_noreclaim_save(); |
b4b9e355 | 332 | ret = sk->sk_backlog_rcv(sk, skb); |
f1083048 | 333 | memalloc_noreclaim_restore(noreclaim_flag); |
b4b9e355 MG |
334 | |
335 | return ret; | |
336 | } | |
337 | EXPORT_SYMBOL(__sk_backlog_rcv); | |
338 | ||
a9beb86a | 339 | static int sock_get_timeout(long timeo, void *optval, bool old_timeval) |
fe0c72f3 | 340 | { |
a9beb86a DD |
341 | struct __kernel_sock_timeval tv; |
342 | int size; | |
fe0c72f3 AB |
343 | |
344 | if (timeo == MAX_SCHEDULE_TIMEOUT) { | |
345 | tv.tv_sec = 0; | |
346 | tv.tv_usec = 0; | |
347 | } else { | |
348 | tv.tv_sec = timeo / HZ; | |
349 | tv.tv_usec = ((timeo % HZ) * USEC_PER_SEC) / HZ; | |
350 | } | |
351 | ||
e6986423 | 352 | if (old_timeval && in_compat_syscall() && !COMPAT_USE_64BIT_TIME) { |
fe0c72f3 AB |
353 | struct old_timeval32 tv32 = { tv.tv_sec, tv.tv_usec }; |
354 | *(struct old_timeval32 *)optval = tv32; | |
355 | return sizeof(tv32); | |
356 | } | |
357 | ||
a9beb86a DD |
358 | if (old_timeval) { |
359 | struct __kernel_old_timeval old_tv; | |
360 | old_tv.tv_sec = tv.tv_sec; | |
361 | old_tv.tv_usec = tv.tv_usec; | |
362 | *(struct __kernel_old_timeval *)optval = old_tv; | |
363 | size = sizeof(old_tv); | |
364 | } else { | |
365 | *(struct __kernel_sock_timeval *)optval = tv; | |
366 | size = sizeof(tv); | |
367 | } | |
368 | ||
369 | return size; | |
fe0c72f3 AB |
370 | } |
371 | ||
a9beb86a | 372 | static int sock_set_timeout(long *timeo_p, char __user *optval, int optlen, bool old_timeval) |
1da177e4 | 373 | { |
a9beb86a | 374 | struct __kernel_sock_timeval tv; |
1da177e4 | 375 | |
e6986423 | 376 | if (old_timeval && in_compat_syscall() && !COMPAT_USE_64BIT_TIME) { |
fe0c72f3 AB |
377 | struct old_timeval32 tv32; |
378 | ||
379 | if (optlen < sizeof(tv32)) | |
380 | return -EINVAL; | |
381 | ||
382 | if (copy_from_user(&tv32, optval, sizeof(tv32))) | |
383 | return -EFAULT; | |
384 | tv.tv_sec = tv32.tv_sec; | |
385 | tv.tv_usec = tv32.tv_usec; | |
a9beb86a DD |
386 | } else if (old_timeval) { |
387 | struct __kernel_old_timeval old_tv; | |
388 | ||
389 | if (optlen < sizeof(old_tv)) | |
390 | return -EINVAL; | |
391 | if (copy_from_user(&old_tv, optval, sizeof(old_tv))) | |
392 | return -EFAULT; | |
393 | tv.tv_sec = old_tv.tv_sec; | |
394 | tv.tv_usec = old_tv.tv_usec; | |
fe0c72f3 AB |
395 | } else { |
396 | if (optlen < sizeof(tv)) | |
397 | return -EINVAL; | |
398 | if (copy_from_user(&tv, optval, sizeof(tv))) | |
399 | return -EFAULT; | |
400 | } | |
ba78073e VA |
401 | if (tv.tv_usec < 0 || tv.tv_usec >= USEC_PER_SEC) |
402 | return -EDOM; | |
1da177e4 | 403 | |
ba78073e | 404 | if (tv.tv_sec < 0) { |
6f11df83 AM |
405 | static int warned __read_mostly; |
406 | ||
ba78073e | 407 | *timeo_p = 0; |
50aab54f | 408 | if (warned < 10 && net_ratelimit()) { |
ba78073e | 409 | warned++; |
e005d193 JP |
410 | pr_info("%s: `%s' (pid %d) tries to set negative timeout\n", |
411 | __func__, current->comm, task_pid_nr(current)); | |
50aab54f | 412 | } |
ba78073e VA |
413 | return 0; |
414 | } | |
1da177e4 LT |
415 | *timeo_p = MAX_SCHEDULE_TIMEOUT; |
416 | if (tv.tv_sec == 0 && tv.tv_usec == 0) | |
417 | return 0; | |
a9beb86a DD |
418 | if (tv.tv_sec < (MAX_SCHEDULE_TIMEOUT / HZ - 1)) |
419 | *timeo_p = tv.tv_sec * HZ + DIV_ROUND_UP((unsigned long)tv.tv_usec, USEC_PER_SEC / HZ); | |
1da177e4 LT |
420 | return 0; |
421 | } | |
422 | ||
423 | static void sock_warn_obsolete_bsdism(const char *name) | |
424 | { | |
425 | static int warned; | |
426 | static char warncomm[TASK_COMM_LEN]; | |
4ec93edb YH |
427 | if (strcmp(warncomm, current->comm) && warned < 5) { |
428 | strcpy(warncomm, current->comm); | |
e005d193 JP |
429 | pr_warn("process `%s' is using obsolete %s SO_BSDCOMPAT\n", |
430 | warncomm, name); | |
1da177e4 LT |
431 | warned++; |
432 | } | |
433 | } | |
434 | ||
080a270f HFS |
435 | static bool sock_needs_netstamp(const struct sock *sk) |
436 | { | |
437 | switch (sk->sk_family) { | |
438 | case AF_UNSPEC: | |
439 | case AF_UNIX: | |
440 | return false; | |
441 | default: | |
442 | return true; | |
443 | } | |
444 | } | |
445 | ||
08e29af3 | 446 | static void sock_disable_timestamp(struct sock *sk, unsigned long flags) |
4ec93edb | 447 | { |
08e29af3 ED |
448 | if (sk->sk_flags & flags) { |
449 | sk->sk_flags &= ~flags; | |
080a270f HFS |
450 | if (sock_needs_netstamp(sk) && |
451 | !(sk->sk_flags & SK_FLAGS_TIMESTAMP)) | |
20d49473 | 452 | net_disable_timestamp(); |
1da177e4 LT |
453 | } |
454 | } | |
455 | ||
456 | ||
e6afc8ac | 457 | int __sock_queue_rcv_skb(struct sock *sk, struct sk_buff *skb) |
f0088a50 | 458 | { |
3b885787 NH |
459 | unsigned long flags; |
460 | struct sk_buff_head *list = &sk->sk_receive_queue; | |
f0088a50 | 461 | |
0fd7bac6 | 462 | if (atomic_read(&sk->sk_rmem_alloc) >= sk->sk_rcvbuf) { |
766e9037 | 463 | atomic_inc(&sk->sk_drops); |
3847ce32 | 464 | trace_sock_rcvqueue_full(sk, skb); |
766e9037 | 465 | return -ENOMEM; |
f0088a50 DV |
466 | } |
467 | ||
c76562b6 | 468 | if (!sk_rmem_schedule(sk, skb, skb->truesize)) { |
766e9037 ED |
469 | atomic_inc(&sk->sk_drops); |
470 | return -ENOBUFS; | |
3ab224be HA |
471 | } |
472 | ||
f0088a50 DV |
473 | skb->dev = NULL; |
474 | skb_set_owner_r(skb, sk); | |
49ad9599 | 475 | |
7fee226a ED |
476 | /* we escape from rcu protected region, make sure we dont leak |
477 | * a norefcounted dst | |
478 | */ | |
479 | skb_dst_force(skb); | |
480 | ||
3b885787 | 481 | spin_lock_irqsave(&list->lock, flags); |
3bc3b96f | 482 | sock_skb_set_dropcount(sk, skb); |
3b885787 NH |
483 | __skb_queue_tail(list, skb); |
484 | spin_unlock_irqrestore(&list->lock, flags); | |
f0088a50 DV |
485 | |
486 | if (!sock_flag(sk, SOCK_DEAD)) | |
676d2369 | 487 | sk->sk_data_ready(sk); |
766e9037 | 488 | return 0; |
f0088a50 | 489 | } |
e6afc8ac | 490 | EXPORT_SYMBOL(__sock_queue_rcv_skb); |
491 | ||
492 | int sock_queue_rcv_skb(struct sock *sk, struct sk_buff *skb) | |
493 | { | |
494 | int err; | |
495 | ||
496 | err = sk_filter(sk, skb); | |
497 | if (err) | |
498 | return err; | |
499 | ||
500 | return __sock_queue_rcv_skb(sk, skb); | |
501 | } | |
f0088a50 DV |
502 | EXPORT_SYMBOL(sock_queue_rcv_skb); |
503 | ||
4f0c40d9 | 504 | int __sk_receive_skb(struct sock *sk, struct sk_buff *skb, |
c3f24cfb | 505 | const int nested, unsigned int trim_cap, bool refcounted) |
f0088a50 DV |
506 | { |
507 | int rc = NET_RX_SUCCESS; | |
508 | ||
4f0c40d9 | 509 | if (sk_filter_trim_cap(sk, skb, trim_cap)) |
f0088a50 DV |
510 | goto discard_and_relse; |
511 | ||
512 | skb->dev = NULL; | |
513 | ||
274f482d | 514 | if (sk_rcvqueues_full(sk, sk->sk_rcvbuf)) { |
c377411f ED |
515 | atomic_inc(&sk->sk_drops); |
516 | goto discard_and_relse; | |
517 | } | |
58a5a7b9 ACM |
518 | if (nested) |
519 | bh_lock_sock_nested(sk); | |
520 | else | |
521 | bh_lock_sock(sk); | |
a5b5bb9a IM |
522 | if (!sock_owned_by_user(sk)) { |
523 | /* | |
524 | * trylock + unlock semantics: | |
525 | */ | |
526 | mutex_acquire(&sk->sk_lock.dep_map, 0, 1, _RET_IP_); | |
527 | ||
c57943a1 | 528 | rc = sk_backlog_rcv(sk, skb); |
a5b5bb9a IM |
529 | |
530 | mutex_release(&sk->sk_lock.dep_map, 1, _RET_IP_); | |
f545a38f | 531 | } else if (sk_add_backlog(sk, skb, sk->sk_rcvbuf)) { |
8eae939f ZY |
532 | bh_unlock_sock(sk); |
533 | atomic_inc(&sk->sk_drops); | |
534 | goto discard_and_relse; | |
535 | } | |
536 | ||
f0088a50 DV |
537 | bh_unlock_sock(sk); |
538 | out: | |
c3f24cfb ED |
539 | if (refcounted) |
540 | sock_put(sk); | |
f0088a50 DV |
541 | return rc; |
542 | discard_and_relse: | |
543 | kfree_skb(skb); | |
544 | goto out; | |
545 | } | |
4f0c40d9 | 546 | EXPORT_SYMBOL(__sk_receive_skb); |
f0088a50 DV |
547 | |
548 | struct dst_entry *__sk_dst_check(struct sock *sk, u32 cookie) | |
549 | { | |
b6c6712a | 550 | struct dst_entry *dst = __sk_dst_get(sk); |
f0088a50 DV |
551 | |
552 | if (dst && dst->obsolete && dst->ops->check(dst, cookie) == NULL) { | |
e022f0b4 | 553 | sk_tx_queue_clear(sk); |
9b8805a3 | 554 | sk->sk_dst_pending_confirm = 0; |
a9b3cd7f | 555 | RCU_INIT_POINTER(sk->sk_dst_cache, NULL); |
f0088a50 DV |
556 | dst_release(dst); |
557 | return NULL; | |
558 | } | |
559 | ||
560 | return dst; | |
561 | } | |
562 | EXPORT_SYMBOL(__sk_dst_check); | |
563 | ||
564 | struct dst_entry *sk_dst_check(struct sock *sk, u32 cookie) | |
565 | { | |
566 | struct dst_entry *dst = sk_dst_get(sk); | |
567 | ||
568 | if (dst && dst->obsolete && dst->ops->check(dst, cookie) == NULL) { | |
569 | sk_dst_reset(sk); | |
570 | dst_release(dst); | |
571 | return NULL; | |
572 | } | |
573 | ||
574 | return dst; | |
575 | } | |
576 | EXPORT_SYMBOL(sk_dst_check); | |
577 | ||
f5dd3d0c | 578 | static int sock_setbindtodevice_locked(struct sock *sk, int ifindex) |
4878809f DM |
579 | { |
580 | int ret = -ENOPROTOOPT; | |
581 | #ifdef CONFIG_NETDEVICES | |
3b1e0a65 | 582 | struct net *net = sock_net(sk); |
4878809f DM |
583 | |
584 | /* Sorry... */ | |
585 | ret = -EPERM; | |
5e1fccc0 | 586 | if (!ns_capable(net->user_ns, CAP_NET_RAW)) |
4878809f DM |
587 | goto out; |
588 | ||
f5dd3d0c DH |
589 | ret = -EINVAL; |
590 | if (ifindex < 0) | |
591 | goto out; | |
592 | ||
593 | sk->sk_bound_dev_if = ifindex; | |
594 | if (sk->sk_prot->rehash) | |
595 | sk->sk_prot->rehash(sk); | |
596 | sk_dst_reset(sk); | |
597 | ||
598 | ret = 0; | |
599 | ||
600 | out: | |
601 | #endif | |
602 | ||
603 | return ret; | |
604 | } | |
605 | ||
606 | static int sock_setbindtodevice(struct sock *sk, char __user *optval, | |
607 | int optlen) | |
608 | { | |
609 | int ret = -ENOPROTOOPT; | |
610 | #ifdef CONFIG_NETDEVICES | |
611 | struct net *net = sock_net(sk); | |
612 | char devname[IFNAMSIZ]; | |
613 | int index; | |
614 | ||
4878809f DM |
615 | ret = -EINVAL; |
616 | if (optlen < 0) | |
617 | goto out; | |
618 | ||
619 | /* Bind this socket to a particular device like "eth0", | |
620 | * as specified in the passed interface name. If the | |
621 | * name is "" or the option length is zero the socket | |
622 | * is not bound. | |
623 | */ | |
624 | if (optlen > IFNAMSIZ - 1) | |
625 | optlen = IFNAMSIZ - 1; | |
626 | memset(devname, 0, sizeof(devname)); | |
627 | ||
628 | ret = -EFAULT; | |
629 | if (copy_from_user(devname, optval, optlen)) | |
630 | goto out; | |
631 | ||
000ba2e4 DM |
632 | index = 0; |
633 | if (devname[0] != '\0') { | |
bf8e56bf | 634 | struct net_device *dev; |
4878809f | 635 | |
bf8e56bf ED |
636 | rcu_read_lock(); |
637 | dev = dev_get_by_name_rcu(net, devname); | |
638 | if (dev) | |
639 | index = dev->ifindex; | |
640 | rcu_read_unlock(); | |
4878809f DM |
641 | ret = -ENODEV; |
642 | if (!dev) | |
643 | goto out; | |
4878809f DM |
644 | } |
645 | ||
646 | lock_sock(sk); | |
f5dd3d0c | 647 | ret = sock_setbindtodevice_locked(sk, index); |
4878809f DM |
648 | release_sock(sk); |
649 | ||
4878809f DM |
650 | out: |
651 | #endif | |
652 | ||
653 | return ret; | |
654 | } | |
655 | ||
c91f6df2 BH |
656 | static int sock_getbindtodevice(struct sock *sk, char __user *optval, |
657 | int __user *optlen, int len) | |
658 | { | |
659 | int ret = -ENOPROTOOPT; | |
660 | #ifdef CONFIG_NETDEVICES | |
661 | struct net *net = sock_net(sk); | |
c91f6df2 | 662 | char devname[IFNAMSIZ]; |
c91f6df2 BH |
663 | |
664 | if (sk->sk_bound_dev_if == 0) { | |
665 | len = 0; | |
666 | goto zero; | |
667 | } | |
668 | ||
669 | ret = -EINVAL; | |
670 | if (len < IFNAMSIZ) | |
671 | goto out; | |
672 | ||
5dbe7c17 NS |
673 | ret = netdev_get_name(net, devname, sk->sk_bound_dev_if); |
674 | if (ret) | |
c91f6df2 | 675 | goto out; |
c91f6df2 BH |
676 | |
677 | len = strlen(devname) + 1; | |
678 | ||
679 | ret = -EFAULT; | |
680 | if (copy_to_user(optval, devname, len)) | |
681 | goto out; | |
682 | ||
683 | zero: | |
684 | ret = -EFAULT; | |
685 | if (put_user(len, optlen)) | |
686 | goto out; | |
687 | ||
688 | ret = 0; | |
689 | ||
690 | out: | |
691 | #endif | |
692 | ||
693 | return ret; | |
694 | } | |
695 | ||
c0ef877b PE |
696 | static inline void sock_valbool_flag(struct sock *sk, int bit, int valbool) |
697 | { | |
698 | if (valbool) | |
699 | sock_set_flag(sk, bit); | |
700 | else | |
701 | sock_reset_flag(sk, bit); | |
702 | } | |
703 | ||
f60e5990 | 704 | bool sk_mc_loop(struct sock *sk) |
705 | { | |
706 | if (dev_recursion_level()) | |
707 | return false; | |
708 | if (!sk) | |
709 | return true; | |
710 | switch (sk->sk_family) { | |
711 | case AF_INET: | |
712 | return inet_sk(sk)->mc_loop; | |
713 | #if IS_ENABLED(CONFIG_IPV6) | |
714 | case AF_INET6: | |
715 | return inet6_sk(sk)->mc_loop; | |
716 | #endif | |
717 | } | |
718 | WARN_ON(1); | |
719 | return true; | |
720 | } | |
721 | EXPORT_SYMBOL(sk_mc_loop); | |
722 | ||
1da177e4 LT |
723 | /* |
724 | * This is meant for all protocols to use and covers goings on | |
725 | * at the socket level. Everything here is generic. | |
726 | */ | |
727 | ||
728 | int sock_setsockopt(struct socket *sock, int level, int optname, | |
b7058842 | 729 | char __user *optval, unsigned int optlen) |
1da177e4 | 730 | { |
80b14dee | 731 | struct sock_txtime sk_txtime; |
2a91525c | 732 | struct sock *sk = sock->sk; |
1da177e4 LT |
733 | int val; |
734 | int valbool; | |
735 | struct linger ling; | |
736 | int ret = 0; | |
4ec93edb | 737 | |
1da177e4 LT |
738 | /* |
739 | * Options without arguments | |
740 | */ | |
741 | ||
4878809f | 742 | if (optname == SO_BINDTODEVICE) |
c91f6df2 | 743 | return sock_setbindtodevice(sk, optval, optlen); |
4878809f | 744 | |
e71a4783 SH |
745 | if (optlen < sizeof(int)) |
746 | return -EINVAL; | |
4ec93edb | 747 | |
1da177e4 LT |
748 | if (get_user(val, (int __user *)optval)) |
749 | return -EFAULT; | |
4ec93edb | 750 | |
2a91525c | 751 | valbool = val ? 1 : 0; |
1da177e4 LT |
752 | |
753 | lock_sock(sk); | |
754 | ||
2a91525c | 755 | switch (optname) { |
e71a4783 | 756 | case SO_DEBUG: |
2a91525c | 757 | if (val && !capable(CAP_NET_ADMIN)) |
e71a4783 | 758 | ret = -EACCES; |
2a91525c | 759 | else |
c0ef877b | 760 | sock_valbool_flag(sk, SOCK_DBG, valbool); |
e71a4783 SH |
761 | break; |
762 | case SO_REUSEADDR: | |
cdb8744d | 763 | sk->sk_reuse = (valbool ? SK_CAN_REUSE : SK_NO_REUSE); |
e71a4783 | 764 | break; |
055dc21a TH |
765 | case SO_REUSEPORT: |
766 | sk->sk_reuseport = valbool; | |
767 | break; | |
e71a4783 | 768 | case SO_TYPE: |
49c794e9 | 769 | case SO_PROTOCOL: |
0d6038ee | 770 | case SO_DOMAIN: |
e71a4783 SH |
771 | case SO_ERROR: |
772 | ret = -ENOPROTOOPT; | |
773 | break; | |
774 | case SO_DONTROUTE: | |
c0ef877b | 775 | sock_valbool_flag(sk, SOCK_LOCALROUTE, valbool); |
0fbe82e6 | 776 | sk_dst_reset(sk); |
e71a4783 SH |
777 | break; |
778 | case SO_BROADCAST: | |
779 | sock_valbool_flag(sk, SOCK_BROADCAST, valbool); | |
780 | break; | |
781 | case SO_SNDBUF: | |
782 | /* Don't error on this BSD doesn't and if you think | |
82981930 ED |
783 | * about it this is right. Otherwise apps have to |
784 | * play 'guess the biggest size' games. RCVBUF/SNDBUF | |
785 | * are treated in BSD as hints | |
786 | */ | |
787 | val = min_t(u32, val, sysctl_wmem_max); | |
b0573dea | 788 | set_sndbuf: |
4057765f GN |
789 | /* Ensure val * 2 fits into an int, to prevent max_t() |
790 | * from treating it as a negative value. | |
791 | */ | |
792 | val = min_t(int, val, INT_MAX / 2); | |
e71a4783 | 793 | sk->sk_userlocks |= SOCK_SNDBUF_LOCK; |
b98b0bc8 | 794 | sk->sk_sndbuf = max_t(int, val * 2, SOCK_MIN_SNDBUF); |
82981930 | 795 | /* Wake up sending tasks if we upped the value. */ |
e71a4783 SH |
796 | sk->sk_write_space(sk); |
797 | break; | |
1da177e4 | 798 | |
e71a4783 SH |
799 | case SO_SNDBUFFORCE: |
800 | if (!capable(CAP_NET_ADMIN)) { | |
801 | ret = -EPERM; | |
802 | break; | |
803 | } | |
4057765f GN |
804 | |
805 | /* No negative values (to prevent underflow, as val will be | |
806 | * multiplied by 2). | |
807 | */ | |
808 | if (val < 0) | |
809 | val = 0; | |
e71a4783 | 810 | goto set_sndbuf; |
b0573dea | 811 | |
e71a4783 SH |
812 | case SO_RCVBUF: |
813 | /* Don't error on this BSD doesn't and if you think | |
82981930 ED |
814 | * about it this is right. Otherwise apps have to |
815 | * play 'guess the biggest size' games. RCVBUF/SNDBUF | |
816 | * are treated in BSD as hints | |
817 | */ | |
818 | val = min_t(u32, val, sysctl_rmem_max); | |
b0573dea | 819 | set_rcvbuf: |
4057765f GN |
820 | /* Ensure val * 2 fits into an int, to prevent max_t() |
821 | * from treating it as a negative value. | |
822 | */ | |
823 | val = min_t(int, val, INT_MAX / 2); | |
e71a4783 SH |
824 | sk->sk_userlocks |= SOCK_RCVBUF_LOCK; |
825 | /* | |
826 | * We double it on the way in to account for | |
827 | * "struct sk_buff" etc. overhead. Applications | |
828 | * assume that the SO_RCVBUF setting they make will | |
829 | * allow that much actual data to be received on that | |
830 | * socket. | |
831 | * | |
832 | * Applications are unaware that "struct sk_buff" and | |
833 | * other overheads allocate from the receive buffer | |
834 | * during socket buffer allocation. | |
835 | * | |
836 | * And after considering the possible alternatives, | |
837 | * returning the value we actually used in getsockopt | |
838 | * is the most desirable behavior. | |
839 | */ | |
b98b0bc8 | 840 | sk->sk_rcvbuf = max_t(int, val * 2, SOCK_MIN_RCVBUF); |
e71a4783 SH |
841 | break; |
842 | ||
843 | case SO_RCVBUFFORCE: | |
844 | if (!capable(CAP_NET_ADMIN)) { | |
845 | ret = -EPERM; | |
1da177e4 | 846 | break; |
e71a4783 | 847 | } |
4057765f GN |
848 | |
849 | /* No negative values (to prevent underflow, as val will be | |
850 | * multiplied by 2). | |
851 | */ | |
852 | if (val < 0) | |
853 | val = 0; | |
e71a4783 | 854 | goto set_rcvbuf; |
1da177e4 | 855 | |
e71a4783 | 856 | case SO_KEEPALIVE: |
4b9d07a4 UB |
857 | if (sk->sk_prot->keepalive) |
858 | sk->sk_prot->keepalive(sk, valbool); | |
e71a4783 SH |
859 | sock_valbool_flag(sk, SOCK_KEEPOPEN, valbool); |
860 | break; | |
861 | ||
862 | case SO_OOBINLINE: | |
863 | sock_valbool_flag(sk, SOCK_URGINLINE, valbool); | |
864 | break; | |
865 | ||
866 | case SO_NO_CHECK: | |
28448b80 | 867 | sk->sk_no_check_tx = valbool; |
e71a4783 SH |
868 | break; |
869 | ||
870 | case SO_PRIORITY: | |
5e1fccc0 EB |
871 | if ((val >= 0 && val <= 6) || |
872 | ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN)) | |
e71a4783 SH |
873 | sk->sk_priority = val; |
874 | else | |
875 | ret = -EPERM; | |
876 | break; | |
877 | ||
878 | case SO_LINGER: | |
879 | if (optlen < sizeof(ling)) { | |
880 | ret = -EINVAL; /* 1003.1g */ | |
1da177e4 | 881 | break; |
e71a4783 | 882 | } |
2a91525c | 883 | if (copy_from_user(&ling, optval, sizeof(ling))) { |
e71a4783 | 884 | ret = -EFAULT; |
1da177e4 | 885 | break; |
e71a4783 SH |
886 | } |
887 | if (!ling.l_onoff) | |
888 | sock_reset_flag(sk, SOCK_LINGER); | |
889 | else { | |
1da177e4 | 890 | #if (BITS_PER_LONG == 32) |
e71a4783 SH |
891 | if ((unsigned int)ling.l_linger >= MAX_SCHEDULE_TIMEOUT/HZ) |
892 | sk->sk_lingertime = MAX_SCHEDULE_TIMEOUT; | |
1da177e4 | 893 | else |
e71a4783 SH |
894 | #endif |
895 | sk->sk_lingertime = (unsigned int)ling.l_linger * HZ; | |
896 | sock_set_flag(sk, SOCK_LINGER); | |
897 | } | |
898 | break; | |
899 | ||
900 | case SO_BSDCOMPAT: | |
901 | sock_warn_obsolete_bsdism("setsockopt"); | |
902 | break; | |
903 | ||
904 | case SO_PASSCRED: | |
905 | if (valbool) | |
906 | set_bit(SOCK_PASSCRED, &sock->flags); | |
907 | else | |
908 | clear_bit(SOCK_PASSCRED, &sock->flags); | |
909 | break; | |
910 | ||
7f1bc6e9 | 911 | case SO_TIMESTAMP_OLD: |
887feae3 | 912 | case SO_TIMESTAMP_NEW: |
7f1bc6e9 | 913 | case SO_TIMESTAMPNS_OLD: |
887feae3 | 914 | case SO_TIMESTAMPNS_NEW: |
e71a4783 | 915 | if (valbool) { |
887feae3 DD |
916 | if (optname == SO_TIMESTAMP_NEW || optname == SO_TIMESTAMPNS_NEW) |
917 | sock_set_flag(sk, SOCK_TSTAMP_NEW); | |
918 | else | |
919 | sock_reset_flag(sk, SOCK_TSTAMP_NEW); | |
920 | ||
921 | if (optname == SO_TIMESTAMP_OLD || optname == SO_TIMESTAMP_NEW) | |
92f37fd2 ED |
922 | sock_reset_flag(sk, SOCK_RCVTSTAMPNS); |
923 | else | |
924 | sock_set_flag(sk, SOCK_RCVTSTAMPNS); | |
e71a4783 | 925 | sock_set_flag(sk, SOCK_RCVTSTAMP); |
20d49473 | 926 | sock_enable_timestamp(sk, SOCK_TIMESTAMP); |
92f37fd2 | 927 | } else { |
e71a4783 | 928 | sock_reset_flag(sk, SOCK_RCVTSTAMP); |
92f37fd2 | 929 | sock_reset_flag(sk, SOCK_RCVTSTAMPNS); |
887feae3 | 930 | sock_reset_flag(sk, SOCK_TSTAMP_NEW); |
92f37fd2 | 931 | } |
e71a4783 SH |
932 | break; |
933 | ||
9718475e DD |
934 | case SO_TIMESTAMPING_NEW: |
935 | sock_set_flag(sk, SOCK_TSTAMP_NEW); | |
ff7653f9 | 936 | /* fall through */ |
7f1bc6e9 | 937 | case SO_TIMESTAMPING_OLD: |
20d49473 | 938 | if (val & ~SOF_TIMESTAMPING_MASK) { |
f249fb78 | 939 | ret = -EINVAL; |
20d49473 PO |
940 | break; |
941 | } | |
b245be1f | 942 | |
09c2d251 | 943 | if (val & SOF_TIMESTAMPING_OPT_ID && |
4ed2d765 | 944 | !(sk->sk_tsflags & SOF_TIMESTAMPING_OPT_ID)) { |
ac5cc977 WC |
945 | if (sk->sk_protocol == IPPROTO_TCP && |
946 | sk->sk_type == SOCK_STREAM) { | |
6db8b963 SHY |
947 | if ((1 << sk->sk_state) & |
948 | (TCPF_CLOSE | TCPF_LISTEN)) { | |
4ed2d765 WB |
949 | ret = -EINVAL; |
950 | break; | |
951 | } | |
952 | sk->sk_tskey = tcp_sk(sk)->snd_una; | |
953 | } else { | |
954 | sk->sk_tskey = 0; | |
955 | } | |
956 | } | |
1c885808 FY |
957 | |
958 | if (val & SOF_TIMESTAMPING_OPT_STATS && | |
959 | !(val & SOF_TIMESTAMPING_OPT_TSONLY)) { | |
960 | ret = -EINVAL; | |
961 | break; | |
962 | } | |
963 | ||
b9f40e21 | 964 | sk->sk_tsflags = val; |
20d49473 PO |
965 | if (val & SOF_TIMESTAMPING_RX_SOFTWARE) |
966 | sock_enable_timestamp(sk, | |
967 | SOCK_TIMESTAMPING_RX_SOFTWARE); | |
9718475e DD |
968 | else { |
969 | if (optname == SO_TIMESTAMPING_NEW) | |
970 | sock_reset_flag(sk, SOCK_TSTAMP_NEW); | |
971 | ||
20d49473 | 972 | sock_disable_timestamp(sk, |
08e29af3 | 973 | (1UL << SOCK_TIMESTAMPING_RX_SOFTWARE)); |
9718475e | 974 | } |
20d49473 PO |
975 | break; |
976 | ||
e71a4783 SH |
977 | case SO_RCVLOWAT: |
978 | if (val < 0) | |
979 | val = INT_MAX; | |
d1361840 ED |
980 | if (sock->ops->set_rcvlowat) |
981 | ret = sock->ops->set_rcvlowat(sk, val); | |
982 | else | |
983 | sk->sk_rcvlowat = val ? : 1; | |
e71a4783 SH |
984 | break; |
985 | ||
45bdc661 | 986 | case SO_RCVTIMEO_OLD: |
a9beb86a DD |
987 | case SO_RCVTIMEO_NEW: |
988 | ret = sock_set_timeout(&sk->sk_rcvtimeo, optval, optlen, optname == SO_RCVTIMEO_OLD); | |
e71a4783 SH |
989 | break; |
990 | ||
45bdc661 | 991 | case SO_SNDTIMEO_OLD: |
a9beb86a DD |
992 | case SO_SNDTIMEO_NEW: |
993 | ret = sock_set_timeout(&sk->sk_sndtimeo, optval, optlen, optname == SO_SNDTIMEO_OLD); | |
e71a4783 | 994 | break; |
1da177e4 | 995 | |
e71a4783 SH |
996 | case SO_ATTACH_FILTER: |
997 | ret = -EINVAL; | |
998 | if (optlen == sizeof(struct sock_fprog)) { | |
999 | struct sock_fprog fprog; | |
1da177e4 | 1000 | |
e71a4783 SH |
1001 | ret = -EFAULT; |
1002 | if (copy_from_user(&fprog, optval, sizeof(fprog))) | |
1da177e4 | 1003 | break; |
e71a4783 SH |
1004 | |
1005 | ret = sk_attach_filter(&fprog, sk); | |
1006 | } | |
1007 | break; | |
1008 | ||
89aa0758 AS |
1009 | case SO_ATTACH_BPF: |
1010 | ret = -EINVAL; | |
1011 | if (optlen == sizeof(u32)) { | |
1012 | u32 ufd; | |
1013 | ||
1014 | ret = -EFAULT; | |
1015 | if (copy_from_user(&ufd, optval, sizeof(ufd))) | |
1016 | break; | |
1017 | ||
1018 | ret = sk_attach_bpf(ufd, sk); | |
1019 | } | |
1020 | break; | |
1021 | ||
538950a1 CG |
1022 | case SO_ATTACH_REUSEPORT_CBPF: |
1023 | ret = -EINVAL; | |
1024 | if (optlen == sizeof(struct sock_fprog)) { | |
1025 | struct sock_fprog fprog; | |
1026 | ||
1027 | ret = -EFAULT; | |
1028 | if (copy_from_user(&fprog, optval, sizeof(fprog))) | |
1029 | break; | |
1030 | ||
1031 | ret = sk_reuseport_attach_filter(&fprog, sk); | |
1032 | } | |
1033 | break; | |
1034 | ||
1035 | case SO_ATTACH_REUSEPORT_EBPF: | |
1036 | ret = -EINVAL; | |
1037 | if (optlen == sizeof(u32)) { | |
1038 | u32 ufd; | |
1039 | ||
1040 | ret = -EFAULT; | |
1041 | if (copy_from_user(&ufd, optval, sizeof(ufd))) | |
1042 | break; | |
1043 | ||
1044 | ret = sk_reuseport_attach_bpf(ufd, sk); | |
1045 | } | |
1046 | break; | |
1047 | ||
e71a4783 | 1048 | case SO_DETACH_FILTER: |
55b33325 | 1049 | ret = sk_detach_filter(sk); |
e71a4783 | 1050 | break; |
1da177e4 | 1051 | |
d59577b6 VB |
1052 | case SO_LOCK_FILTER: |
1053 | if (sock_flag(sk, SOCK_FILTER_LOCKED) && !valbool) | |
1054 | ret = -EPERM; | |
1055 | else | |
1056 | sock_valbool_flag(sk, SOCK_FILTER_LOCKED, valbool); | |
1057 | break; | |
1058 | ||
e71a4783 SH |
1059 | case SO_PASSSEC: |
1060 | if (valbool) | |
1061 | set_bit(SOCK_PASSSEC, &sock->flags); | |
1062 | else | |
1063 | clear_bit(SOCK_PASSSEC, &sock->flags); | |
1064 | break; | |
4a19ec58 | 1065 | case SO_MARK: |
50254256 | 1066 | if (!ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN)) { |
4a19ec58 | 1067 | ret = -EPERM; |
50254256 | 1068 | } else if (val != sk->sk_mark) { |
4a19ec58 | 1069 | sk->sk_mark = val; |
50254256 DB |
1070 | sk_dst_reset(sk); |
1071 | } | |
4a19ec58 | 1072 | break; |
877ce7c1 | 1073 | |
3b885787 | 1074 | case SO_RXQ_OVFL: |
8083f0fc | 1075 | sock_valbool_flag(sk, SOCK_RXQ_OVFL, valbool); |
3b885787 | 1076 | break; |
6e3e939f JB |
1077 | |
1078 | case SO_WIFI_STATUS: | |
1079 | sock_valbool_flag(sk, SOCK_WIFI_STATUS, valbool); | |
1080 | break; | |
1081 | ||
ef64a54f PE |
1082 | case SO_PEEK_OFF: |
1083 | if (sock->ops->set_peek_off) | |
12663bfc | 1084 | ret = sock->ops->set_peek_off(sk, val); |
ef64a54f PE |
1085 | else |
1086 | ret = -EOPNOTSUPP; | |
1087 | break; | |
3bdc0eba BG |
1088 | |
1089 | case SO_NOFCS: | |
1090 | sock_valbool_flag(sk, SOCK_NOFCS, valbool); | |
1091 | break; | |
1092 | ||
7d4c04fc KJ |
1093 | case SO_SELECT_ERR_QUEUE: |
1094 | sock_valbool_flag(sk, SOCK_SELECT_ERR_QUEUE, valbool); | |
1095 | break; | |
1096 | ||
e0d1095a | 1097 | #ifdef CONFIG_NET_RX_BUSY_POLL |
64b0dc51 | 1098 | case SO_BUSY_POLL: |
dafcc438 ET |
1099 | /* allow unprivileged users to decrease the value */ |
1100 | if ((val > sk->sk_ll_usec) && !capable(CAP_NET_ADMIN)) | |
1101 | ret = -EPERM; | |
1102 | else { | |
1103 | if (val < 0) | |
1104 | ret = -EINVAL; | |
1105 | else | |
1106 | sk->sk_ll_usec = val; | |
1107 | } | |
1108 | break; | |
1109 | #endif | |
62748f32 ED |
1110 | |
1111 | case SO_MAX_PACING_RATE: | |
6bdef102 ED |
1112 | { |
1113 | unsigned long ulval = (val == ~0U) ? ~0UL : val; | |
1114 | ||
1115 | if (sizeof(ulval) != sizeof(val) && | |
1116 | optlen >= sizeof(ulval) && | |
1117 | get_user(ulval, (unsigned long __user *)optval)) { | |
1118 | ret = -EFAULT; | |
1119 | break; | |
1120 | } | |
1121 | if (ulval != ~0UL) | |
218af599 ED |
1122 | cmpxchg(&sk->sk_pacing_status, |
1123 | SK_PACING_NONE, | |
1124 | SK_PACING_NEEDED); | |
6bdef102 ED |
1125 | sk->sk_max_pacing_rate = ulval; |
1126 | sk->sk_pacing_rate = min(sk->sk_pacing_rate, ulval); | |
62748f32 | 1127 | break; |
6bdef102 | 1128 | } |
70da268b ED |
1129 | case SO_INCOMING_CPU: |
1130 | sk->sk_incoming_cpu = val; | |
1131 | break; | |
1132 | ||
a87cb3e4 TH |
1133 | case SO_CNX_ADVICE: |
1134 | if (val == 1) | |
1135 | dst_negative_advice(sk); | |
1136 | break; | |
76851d12 WB |
1137 | |
1138 | case SO_ZEROCOPY: | |
28190752 | 1139 | if (sk->sk_family == PF_INET || sk->sk_family == PF_INET6) { |
b5947e5d WB |
1140 | if (!((sk->sk_type == SOCK_STREAM && |
1141 | sk->sk_protocol == IPPROTO_TCP) || | |
1142 | (sk->sk_type == SOCK_DGRAM && | |
1143 | sk->sk_protocol == IPPROTO_UDP))) | |
28190752 | 1144 | ret = -ENOTSUPP; |
28190752 | 1145 | } else if (sk->sk_family != PF_RDS) { |
76851d12 | 1146 | ret = -ENOTSUPP; |
28190752 SV |
1147 | } |
1148 | if (!ret) { | |
1149 | if (val < 0 || val > 1) | |
1150 | ret = -EINVAL; | |
1151 | else | |
1152 | sock_valbool_flag(sk, SOCK_ZEROCOPY, valbool); | |
28190752 | 1153 | } |
334e6413 JSP |
1154 | break; |
1155 | ||
80b14dee RC |
1156 | case SO_TXTIME: |
1157 | if (!ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN)) { | |
1158 | ret = -EPERM; | |
1159 | } else if (optlen != sizeof(struct sock_txtime)) { | |
1160 | ret = -EINVAL; | |
1161 | } else if (copy_from_user(&sk_txtime, optval, | |
1162 | sizeof(struct sock_txtime))) { | |
1163 | ret = -EFAULT; | |
1164 | } else if (sk_txtime.flags & ~SOF_TXTIME_FLAGS_MASK) { | |
1165 | ret = -EINVAL; | |
1166 | } else { | |
1167 | sock_valbool_flag(sk, SOCK_TXTIME, true); | |
1168 | sk->sk_clockid = sk_txtime.clockid; | |
1169 | sk->sk_txtime_deadline_mode = | |
1170 | !!(sk_txtime.flags & SOF_TXTIME_DEADLINE_MODE); | |
4b15c707 JSP |
1171 | sk->sk_txtime_report_errors = |
1172 | !!(sk_txtime.flags & SOF_TXTIME_REPORT_ERRORS); | |
80b14dee RC |
1173 | } |
1174 | break; | |
1175 | ||
f5dd3d0c DH |
1176 | case SO_BINDTOIFINDEX: |
1177 | ret = sock_setbindtodevice_locked(sk, val); | |
1178 | break; | |
1179 | ||
e71a4783 SH |
1180 | default: |
1181 | ret = -ENOPROTOOPT; | |
1182 | break; | |
4ec93edb | 1183 | } |
1da177e4 LT |
1184 | release_sock(sk); |
1185 | return ret; | |
1186 | } | |
2a91525c | 1187 | EXPORT_SYMBOL(sock_setsockopt); |
1da177e4 LT |
1188 | |
1189 | ||
8f09898b | 1190 | static void cred_to_ucred(struct pid *pid, const struct cred *cred, |
1191 | struct ucred *ucred) | |
3f551f94 EB |
1192 | { |
1193 | ucred->pid = pid_vnr(pid); | |
1194 | ucred->uid = ucred->gid = -1; | |
1195 | if (cred) { | |
1196 | struct user_namespace *current_ns = current_user_ns(); | |
1197 | ||
b2e4f544 EB |
1198 | ucred->uid = from_kuid_munged(current_ns, cred->euid); |
1199 | ucred->gid = from_kgid_munged(current_ns, cred->egid); | |
3f551f94 EB |
1200 | } |
1201 | } | |
1202 | ||
28b5ba2a DH |
1203 | static int groups_to_user(gid_t __user *dst, const struct group_info *src) |
1204 | { | |
1205 | struct user_namespace *user_ns = current_user_ns(); | |
1206 | int i; | |
1207 | ||
1208 | for (i = 0; i < src->ngroups; i++) | |
1209 | if (put_user(from_kgid_munged(user_ns, src->gid[i]), dst + i)) | |
1210 | return -EFAULT; | |
1211 | ||
1212 | return 0; | |
1213 | } | |
1214 | ||
1da177e4 LT |
1215 | int sock_getsockopt(struct socket *sock, int level, int optname, |
1216 | char __user *optval, int __user *optlen) | |
1217 | { | |
1218 | struct sock *sk = sock->sk; | |
4ec93edb | 1219 | |
e71a4783 | 1220 | union { |
4ec93edb | 1221 | int val; |
5daab9db | 1222 | u64 val64; |
677f136c | 1223 | unsigned long ulval; |
4ec93edb | 1224 | struct linger ling; |
fe0c72f3 AB |
1225 | struct old_timeval32 tm32; |
1226 | struct __kernel_old_timeval tm; | |
a9beb86a | 1227 | struct __kernel_sock_timeval stm; |
80b14dee | 1228 | struct sock_txtime txtime; |
1da177e4 | 1229 | } v; |
4ec93edb | 1230 | |
4d0392be | 1231 | int lv = sizeof(int); |
1da177e4 | 1232 | int len; |
4ec93edb | 1233 | |
e71a4783 | 1234 | if (get_user(len, optlen)) |
4ec93edb | 1235 | return -EFAULT; |
e71a4783 | 1236 | if (len < 0) |
1da177e4 | 1237 | return -EINVAL; |
4ec93edb | 1238 | |
50fee1de | 1239 | memset(&v, 0, sizeof(v)); |
df0bca04 | 1240 | |
2a91525c | 1241 | switch (optname) { |
e71a4783 SH |
1242 | case SO_DEBUG: |
1243 | v.val = sock_flag(sk, SOCK_DBG); | |
1244 | break; | |
1245 | ||
1246 | case SO_DONTROUTE: | |
1247 | v.val = sock_flag(sk, SOCK_LOCALROUTE); | |
1248 | break; | |
1249 | ||
1250 | case SO_BROADCAST: | |
1b23a5df | 1251 | v.val = sock_flag(sk, SOCK_BROADCAST); |
e71a4783 SH |
1252 | break; |
1253 | ||
1254 | case SO_SNDBUF: | |
1255 | v.val = sk->sk_sndbuf; | |
1256 | break; | |
1257 | ||
1258 | case SO_RCVBUF: | |
1259 | v.val = sk->sk_rcvbuf; | |
1260 | break; | |
1261 | ||
1262 | case SO_REUSEADDR: | |
1263 | v.val = sk->sk_reuse; | |
1264 | break; | |
1265 | ||
055dc21a TH |
1266 | case SO_REUSEPORT: |
1267 | v.val = sk->sk_reuseport; | |
1268 | break; | |
1269 | ||
e71a4783 | 1270 | case SO_KEEPALIVE: |
1b23a5df | 1271 | v.val = sock_flag(sk, SOCK_KEEPOPEN); |
e71a4783 SH |
1272 | break; |
1273 | ||
1274 | case SO_TYPE: | |
1275 | v.val = sk->sk_type; | |
1276 | break; | |
1277 | ||
49c794e9 JE |
1278 | case SO_PROTOCOL: |
1279 | v.val = sk->sk_protocol; | |
1280 | break; | |
1281 | ||
0d6038ee JE |
1282 | case SO_DOMAIN: |
1283 | v.val = sk->sk_family; | |
1284 | break; | |
1285 | ||
e71a4783 SH |
1286 | case SO_ERROR: |
1287 | v.val = -sock_error(sk); | |
2a91525c | 1288 | if (v.val == 0) |
e71a4783 SH |
1289 | v.val = xchg(&sk->sk_err_soft, 0); |
1290 | break; | |
1291 | ||
1292 | case SO_OOBINLINE: | |
1b23a5df | 1293 | v.val = sock_flag(sk, SOCK_URGINLINE); |
e71a4783 SH |
1294 | break; |
1295 | ||
1296 | case SO_NO_CHECK: | |
28448b80 | 1297 | v.val = sk->sk_no_check_tx; |
e71a4783 SH |
1298 | break; |
1299 | ||
1300 | case SO_PRIORITY: | |
1301 | v.val = sk->sk_priority; | |
1302 | break; | |
1303 | ||
1304 | case SO_LINGER: | |
1305 | lv = sizeof(v.ling); | |
1b23a5df | 1306 | v.ling.l_onoff = sock_flag(sk, SOCK_LINGER); |
e71a4783 SH |
1307 | v.ling.l_linger = sk->sk_lingertime / HZ; |
1308 | break; | |
1309 | ||
1310 | case SO_BSDCOMPAT: | |
1311 | sock_warn_obsolete_bsdism("getsockopt"); | |
1312 | break; | |
1313 | ||
7f1bc6e9 | 1314 | case SO_TIMESTAMP_OLD: |
92f37fd2 | 1315 | v.val = sock_flag(sk, SOCK_RCVTSTAMP) && |
887feae3 | 1316 | !sock_flag(sk, SOCK_TSTAMP_NEW) && |
92f37fd2 ED |
1317 | !sock_flag(sk, SOCK_RCVTSTAMPNS); |
1318 | break; | |
1319 | ||
7f1bc6e9 | 1320 | case SO_TIMESTAMPNS_OLD: |
887feae3 DD |
1321 | v.val = sock_flag(sk, SOCK_RCVTSTAMPNS) && !sock_flag(sk, SOCK_TSTAMP_NEW); |
1322 | break; | |
1323 | ||
1324 | case SO_TIMESTAMP_NEW: | |
1325 | v.val = sock_flag(sk, SOCK_RCVTSTAMP) && sock_flag(sk, SOCK_TSTAMP_NEW); | |
1326 | break; | |
1327 | ||
1328 | case SO_TIMESTAMPNS_NEW: | |
1329 | v.val = sock_flag(sk, SOCK_RCVTSTAMPNS) && sock_flag(sk, SOCK_TSTAMP_NEW); | |
e71a4783 SH |
1330 | break; |
1331 | ||
7f1bc6e9 | 1332 | case SO_TIMESTAMPING_OLD: |
b9f40e21 | 1333 | v.val = sk->sk_tsflags; |
20d49473 PO |
1334 | break; |
1335 | ||
a9beb86a DD |
1336 | case SO_RCVTIMEO_OLD: |
1337 | case SO_RCVTIMEO_NEW: | |
1338 | lv = sock_get_timeout(sk->sk_rcvtimeo, &v, SO_RCVTIMEO_OLD == optname); | |
e71a4783 SH |
1339 | break; |
1340 | ||
a9beb86a DD |
1341 | case SO_SNDTIMEO_OLD: |
1342 | case SO_SNDTIMEO_NEW: | |
1343 | lv = sock_get_timeout(sk->sk_sndtimeo, &v, SO_SNDTIMEO_OLD == optname); | |
e71a4783 | 1344 | break; |
1da177e4 | 1345 | |
e71a4783 SH |
1346 | case SO_RCVLOWAT: |
1347 | v.val = sk->sk_rcvlowat; | |
1348 | break; | |
1da177e4 | 1349 | |
e71a4783 | 1350 | case SO_SNDLOWAT: |
2a91525c | 1351 | v.val = 1; |
e71a4783 | 1352 | break; |
1da177e4 | 1353 | |
e71a4783 | 1354 | case SO_PASSCRED: |
82981930 | 1355 | v.val = !!test_bit(SOCK_PASSCRED, &sock->flags); |
e71a4783 | 1356 | break; |
1da177e4 | 1357 | |
e71a4783 | 1358 | case SO_PEERCRED: |
109f6e39 EB |
1359 | { |
1360 | struct ucred peercred; | |
1361 | if (len > sizeof(peercred)) | |
1362 | len = sizeof(peercred); | |
1363 | cred_to_ucred(sk->sk_peer_pid, sk->sk_peer_cred, &peercred); | |
1364 | if (copy_to_user(optval, &peercred, len)) | |
e71a4783 SH |
1365 | return -EFAULT; |
1366 | goto lenout; | |
109f6e39 | 1367 | } |
1da177e4 | 1368 | |
28b5ba2a DH |
1369 | case SO_PEERGROUPS: |
1370 | { | |
1371 | int ret, n; | |
1372 | ||
1373 | if (!sk->sk_peer_cred) | |
1374 | return -ENODATA; | |
1375 | ||
1376 | n = sk->sk_peer_cred->group_info->ngroups; | |
1377 | if (len < n * sizeof(gid_t)) { | |
1378 | len = n * sizeof(gid_t); | |
1379 | return put_user(len, optlen) ? -EFAULT : -ERANGE; | |
1380 | } | |
1381 | len = n * sizeof(gid_t); | |
1382 | ||
1383 | ret = groups_to_user((gid_t __user *)optval, | |
1384 | sk->sk_peer_cred->group_info); | |
1385 | if (ret) | |
1386 | return ret; | |
1387 | goto lenout; | |
1388 | } | |
1389 | ||
e71a4783 SH |
1390 | case SO_PEERNAME: |
1391 | { | |
1392 | char address[128]; | |
1393 | ||
9b2c45d4 DV |
1394 | lv = sock->ops->getname(sock, (struct sockaddr *)address, 2); |
1395 | if (lv < 0) | |
e71a4783 SH |
1396 | return -ENOTCONN; |
1397 | if (lv < len) | |
1398 | return -EINVAL; | |
1399 | if (copy_to_user(optval, address, len)) | |
1400 | return -EFAULT; | |
1401 | goto lenout; | |
1402 | } | |
1da177e4 | 1403 | |
e71a4783 SH |
1404 | /* Dubious BSD thing... Probably nobody even uses it, but |
1405 | * the UNIX standard wants it for whatever reason... -DaveM | |
1406 | */ | |
1407 | case SO_ACCEPTCONN: | |
1408 | v.val = sk->sk_state == TCP_LISTEN; | |
1409 | break; | |
1da177e4 | 1410 | |
e71a4783 | 1411 | case SO_PASSSEC: |
82981930 | 1412 | v.val = !!test_bit(SOCK_PASSSEC, &sock->flags); |
e71a4783 | 1413 | break; |
877ce7c1 | 1414 | |
e71a4783 SH |
1415 | case SO_PEERSEC: |
1416 | return security_socket_getpeersec_stream(sock, optval, optlen, len); | |
1da177e4 | 1417 | |
4a19ec58 LAT |
1418 | case SO_MARK: |
1419 | v.val = sk->sk_mark; | |
1420 | break; | |
1421 | ||
3b885787 | 1422 | case SO_RXQ_OVFL: |
1b23a5df | 1423 | v.val = sock_flag(sk, SOCK_RXQ_OVFL); |
3b885787 NH |
1424 | break; |
1425 | ||
6e3e939f | 1426 | case SO_WIFI_STATUS: |
1b23a5df | 1427 | v.val = sock_flag(sk, SOCK_WIFI_STATUS); |
6e3e939f JB |
1428 | break; |
1429 | ||
ef64a54f PE |
1430 | case SO_PEEK_OFF: |
1431 | if (!sock->ops->set_peek_off) | |
1432 | return -EOPNOTSUPP; | |
1433 | ||
1434 | v.val = sk->sk_peek_off; | |
1435 | break; | |
bc2f7996 | 1436 | case SO_NOFCS: |
1b23a5df | 1437 | v.val = sock_flag(sk, SOCK_NOFCS); |
bc2f7996 | 1438 | break; |
c91f6df2 | 1439 | |
f7b86bfe | 1440 | case SO_BINDTODEVICE: |
c91f6df2 BH |
1441 | return sock_getbindtodevice(sk, optval, optlen, len); |
1442 | ||
a8fc9277 PE |
1443 | case SO_GET_FILTER: |
1444 | len = sk_get_filter(sk, (struct sock_filter __user *)optval, len); | |
1445 | if (len < 0) | |
1446 | return len; | |
1447 | ||
1448 | goto lenout; | |
c91f6df2 | 1449 | |
d59577b6 VB |
1450 | case SO_LOCK_FILTER: |
1451 | v.val = sock_flag(sk, SOCK_FILTER_LOCKED); | |
1452 | break; | |
1453 | ||
ea02f941 MS |
1454 | case SO_BPF_EXTENSIONS: |
1455 | v.val = bpf_tell_extensions(); | |
1456 | break; | |
1457 | ||
7d4c04fc KJ |
1458 | case SO_SELECT_ERR_QUEUE: |
1459 | v.val = sock_flag(sk, SOCK_SELECT_ERR_QUEUE); | |
1460 | break; | |
1461 | ||
e0d1095a | 1462 | #ifdef CONFIG_NET_RX_BUSY_POLL |
64b0dc51 | 1463 | case SO_BUSY_POLL: |
dafcc438 ET |
1464 | v.val = sk->sk_ll_usec; |
1465 | break; | |
1466 | #endif | |
1467 | ||
62748f32 | 1468 | case SO_MAX_PACING_RATE: |
677f136c ED |
1469 | if (sizeof(v.ulval) != sizeof(v.val) && len >= sizeof(v.ulval)) { |
1470 | lv = sizeof(v.ulval); | |
1471 | v.ulval = sk->sk_max_pacing_rate; | |
1472 | } else { | |
1473 | /* 32bit version */ | |
1474 | v.val = min_t(unsigned long, sk->sk_max_pacing_rate, ~0U); | |
1475 | } | |
62748f32 ED |
1476 | break; |
1477 | ||
2c8c56e1 ED |
1478 | case SO_INCOMING_CPU: |
1479 | v.val = sk->sk_incoming_cpu; | |
1480 | break; | |
1481 | ||
a2d133b1 JH |
1482 | case SO_MEMINFO: |
1483 | { | |
1484 | u32 meminfo[SK_MEMINFO_VARS]; | |
1485 | ||
1486 | if (get_user(len, optlen)) | |
1487 | return -EFAULT; | |
1488 | ||
1489 | sk_get_meminfo(sk, meminfo); | |
1490 | ||
1491 | len = min_t(unsigned int, len, sizeof(meminfo)); | |
1492 | if (copy_to_user(optval, &meminfo, len)) | |
1493 | return -EFAULT; | |
1494 | ||
1495 | goto lenout; | |
1496 | } | |
6d433902 SS |
1497 | |
1498 | #ifdef CONFIG_NET_RX_BUSY_POLL | |
1499 | case SO_INCOMING_NAPI_ID: | |
1500 | v.val = READ_ONCE(sk->sk_napi_id); | |
1501 | ||
1502 | /* aggregate non-NAPI IDs down to 0 */ | |
1503 | if (v.val < MIN_NAPI_ID) | |
1504 | v.val = 0; | |
1505 | ||
1506 | break; | |
1507 | #endif | |
1508 | ||
5daab9db CF |
1509 | case SO_COOKIE: |
1510 | lv = sizeof(u64); | |
1511 | if (len < lv) | |
1512 | return -EINVAL; | |
1513 | v.val64 = sock_gen_cookie(sk); | |
1514 | break; | |
1515 | ||
76851d12 WB |
1516 | case SO_ZEROCOPY: |
1517 | v.val = sock_flag(sk, SOCK_ZEROCOPY); | |
1518 | break; | |
1519 | ||
80b14dee RC |
1520 | case SO_TXTIME: |
1521 | lv = sizeof(v.txtime); | |
1522 | v.txtime.clockid = sk->sk_clockid; | |
1523 | v.txtime.flags |= sk->sk_txtime_deadline_mode ? | |
1524 | SOF_TXTIME_DEADLINE_MODE : 0; | |
4b15c707 JSP |
1525 | v.txtime.flags |= sk->sk_txtime_report_errors ? |
1526 | SOF_TXTIME_REPORT_ERRORS : 0; | |
80b14dee RC |
1527 | break; |
1528 | ||
f5dd3d0c DH |
1529 | case SO_BINDTOIFINDEX: |
1530 | v.val = sk->sk_bound_dev_if; | |
1531 | break; | |
1532 | ||
e71a4783 | 1533 | default: |
443b5991 YH |
1534 | /* We implement the SO_SNDLOWAT etc to not be settable |
1535 | * (1003.1g 7). | |
1536 | */ | |
e71a4783 | 1537 | return -ENOPROTOOPT; |
1da177e4 | 1538 | } |
e71a4783 | 1539 | |
1da177e4 LT |
1540 | if (len > lv) |
1541 | len = lv; | |
1542 | if (copy_to_user(optval, &v, len)) | |
1543 | return -EFAULT; | |
1544 | lenout: | |
4ec93edb YH |
1545 | if (put_user(len, optlen)) |
1546 | return -EFAULT; | |
1547 | return 0; | |
1da177e4 LT |
1548 | } |
1549 | ||
a5b5bb9a IM |
1550 | /* |
1551 | * Initialize an sk_lock. | |
1552 | * | |
1553 | * (We also register the sk_lock with the lock validator.) | |
1554 | */ | |
b6f99a21 | 1555 | static inline void sock_lock_init(struct sock *sk) |
a5b5bb9a | 1556 | { |
cdfbabfb DH |
1557 | if (sk->sk_kern_sock) |
1558 | sock_lock_init_class_and_name( | |
1559 | sk, | |
1560 | af_family_kern_slock_key_strings[sk->sk_family], | |
1561 | af_family_kern_slock_keys + sk->sk_family, | |
1562 | af_family_kern_key_strings[sk->sk_family], | |
1563 | af_family_kern_keys + sk->sk_family); | |
1564 | else | |
1565 | sock_lock_init_class_and_name( | |
1566 | sk, | |
ed07536e PZ |
1567 | af_family_slock_key_strings[sk->sk_family], |
1568 | af_family_slock_keys + sk->sk_family, | |
1569 | af_family_key_strings[sk->sk_family], | |
1570 | af_family_keys + sk->sk_family); | |
a5b5bb9a IM |
1571 | } |
1572 | ||
4dc6dc71 ED |
1573 | /* |
1574 | * Copy all fields from osk to nsk but nsk->sk_refcnt must not change yet, | |
1575 | * even temporarly, because of RCU lookups. sk_node should also be left as is. | |
68835aba | 1576 | * We must not copy fields between sk_dontcopy_begin and sk_dontcopy_end |
4dc6dc71 | 1577 | */ |
f1a6c4da PE |
1578 | static void sock_copy(struct sock *nsk, const struct sock *osk) |
1579 | { | |
1580 | #ifdef CONFIG_SECURITY_NETWORK | |
1581 | void *sptr = nsk->sk_security; | |
1582 | #endif | |
68835aba ED |
1583 | memcpy(nsk, osk, offsetof(struct sock, sk_dontcopy_begin)); |
1584 | ||
1585 | memcpy(&nsk->sk_dontcopy_end, &osk->sk_dontcopy_end, | |
1586 | osk->sk_prot->obj_size - offsetof(struct sock, sk_dontcopy_end)); | |
1587 | ||
f1a6c4da PE |
1588 | #ifdef CONFIG_SECURITY_NETWORK |
1589 | nsk->sk_security = sptr; | |
1590 | security_sk_clone(osk, nsk); | |
1591 | #endif | |
1592 | } | |
1593 | ||
2e4afe7b PE |
1594 | static struct sock *sk_prot_alloc(struct proto *prot, gfp_t priority, |
1595 | int family) | |
c308c1b2 PE |
1596 | { |
1597 | struct sock *sk; | |
1598 | struct kmem_cache *slab; | |
1599 | ||
1600 | slab = prot->slab; | |
e912b114 ED |
1601 | if (slab != NULL) { |
1602 | sk = kmem_cache_alloc(slab, priority & ~__GFP_ZERO); | |
1603 | if (!sk) | |
1604 | return sk; | |
ba2489b0 ED |
1605 | if (priority & __GFP_ZERO) |
1606 | sk_prot_clear_nulls(sk, prot->obj_size); | |
fcbdf09d | 1607 | } else |
c308c1b2 PE |
1608 | sk = kmalloc(prot->obj_size, priority); |
1609 | ||
2e4afe7b PE |
1610 | if (sk != NULL) { |
1611 | if (security_sk_alloc(sk, family, priority)) | |
1612 | goto out_free; | |
1613 | ||
1614 | if (!try_module_get(prot->owner)) | |
1615 | goto out_free_sec; | |
e022f0b4 | 1616 | sk_tx_queue_clear(sk); |
2e4afe7b PE |
1617 | } |
1618 | ||
c308c1b2 | 1619 | return sk; |
2e4afe7b PE |
1620 | |
1621 | out_free_sec: | |
1622 | security_sk_free(sk); | |
1623 | out_free: | |
1624 | if (slab != NULL) | |
1625 | kmem_cache_free(slab, sk); | |
1626 | else | |
1627 | kfree(sk); | |
1628 | return NULL; | |
c308c1b2 PE |
1629 | } |
1630 | ||
1631 | static void sk_prot_free(struct proto *prot, struct sock *sk) | |
1632 | { | |
1633 | struct kmem_cache *slab; | |
2e4afe7b | 1634 | struct module *owner; |
c308c1b2 | 1635 | |
2e4afe7b | 1636 | owner = prot->owner; |
c308c1b2 | 1637 | slab = prot->slab; |
2e4afe7b | 1638 | |
bd1060a1 | 1639 | cgroup_sk_free(&sk->sk_cgrp_data); |
2d758073 | 1640 | mem_cgroup_sk_free(sk); |
2e4afe7b | 1641 | security_sk_free(sk); |
c308c1b2 PE |
1642 | if (slab != NULL) |
1643 | kmem_cache_free(slab, sk); | |
1644 | else | |
1645 | kfree(sk); | |
2e4afe7b | 1646 | module_put(owner); |
c308c1b2 PE |
1647 | } |
1648 | ||
1da177e4 LT |
1649 | /** |
1650 | * sk_alloc - All socket objects are allocated here | |
c4ea43c5 | 1651 | * @net: the applicable net namespace |
4dc3b16b PP |
1652 | * @family: protocol family |
1653 | * @priority: for allocation (%GFP_KERNEL, %GFP_ATOMIC, etc) | |
1654 | * @prot: struct proto associated with this new sock instance | |
11aa9c28 | 1655 | * @kern: is this to be a kernel socket? |
1da177e4 | 1656 | */ |
1b8d7ae4 | 1657 | struct sock *sk_alloc(struct net *net, int family, gfp_t priority, |
11aa9c28 | 1658 | struct proto *prot, int kern) |
1da177e4 | 1659 | { |
c308c1b2 | 1660 | struct sock *sk; |
1da177e4 | 1661 | |
154adbc8 | 1662 | sk = sk_prot_alloc(prot, priority | __GFP_ZERO, family); |
1da177e4 | 1663 | if (sk) { |
154adbc8 PE |
1664 | sk->sk_family = family; |
1665 | /* | |
1666 | * See comment in struct sock definition to understand | |
1667 | * why we need sk_prot_creator -acme | |
1668 | */ | |
1669 | sk->sk_prot = sk->sk_prot_creator = prot; | |
cdfbabfb | 1670 | sk->sk_kern_sock = kern; |
154adbc8 | 1671 | sock_lock_init(sk); |
26abe143 | 1672 | sk->sk_net_refcnt = kern ? 0 : 1; |
648845ab | 1673 | if (likely(sk->sk_net_refcnt)) { |
26abe143 | 1674 | get_net(net); |
648845ab TZ |
1675 | sock_inuse_add(net, 1); |
1676 | } | |
1677 | ||
26abe143 | 1678 | sock_net_set(sk, net); |
14afee4b | 1679 | refcount_set(&sk->sk_wmem_alloc, 1); |
f8451725 | 1680 | |
2d758073 | 1681 | mem_cgroup_sk_alloc(sk); |
d979a39d | 1682 | cgroup_sk_alloc(&sk->sk_cgrp_data); |
2a56a1fe TH |
1683 | sock_update_classid(&sk->sk_cgrp_data); |
1684 | sock_update_netprioidx(&sk->sk_cgrp_data); | |
1da177e4 | 1685 | } |
a79af59e | 1686 | |
2e4afe7b | 1687 | return sk; |
1da177e4 | 1688 | } |
2a91525c | 1689 | EXPORT_SYMBOL(sk_alloc); |
1da177e4 | 1690 | |
a4298e45 ED |
1691 | /* Sockets having SOCK_RCU_FREE will call this function after one RCU |
1692 | * grace period. This is the case for UDP sockets and TCP listeners. | |
1693 | */ | |
1694 | static void __sk_destruct(struct rcu_head *head) | |
1da177e4 | 1695 | { |
a4298e45 | 1696 | struct sock *sk = container_of(head, struct sock, sk_rcu); |
1da177e4 | 1697 | struct sk_filter *filter; |
1da177e4 LT |
1698 | |
1699 | if (sk->sk_destruct) | |
1700 | sk->sk_destruct(sk); | |
1701 | ||
a898def2 | 1702 | filter = rcu_dereference_check(sk->sk_filter, |
14afee4b | 1703 | refcount_read(&sk->sk_wmem_alloc) == 0); |
1da177e4 | 1704 | if (filter) { |
309dd5fc | 1705 | sk_filter_uncharge(sk, filter); |
a9b3cd7f | 1706 | RCU_INIT_POINTER(sk->sk_filter, NULL); |
1da177e4 | 1707 | } |
538950a1 CG |
1708 | if (rcu_access_pointer(sk->sk_reuseport_cb)) |
1709 | reuseport_detach_sock(sk); | |
1da177e4 | 1710 | |
08e29af3 | 1711 | sock_disable_timestamp(sk, SK_FLAGS_TIMESTAMP); |
1da177e4 | 1712 | |
6ac99e8f MKL |
1713 | #ifdef CONFIG_BPF_SYSCALL |
1714 | bpf_sk_storage_free(sk); | |
1715 | #endif | |
1716 | ||
1da177e4 | 1717 | if (atomic_read(&sk->sk_omem_alloc)) |
e005d193 JP |
1718 | pr_debug("%s: optmem leakage (%d bytes) detected\n", |
1719 | __func__, atomic_read(&sk->sk_omem_alloc)); | |
1da177e4 | 1720 | |
22a0e18e ED |
1721 | if (sk->sk_frag.page) { |
1722 | put_page(sk->sk_frag.page); | |
1723 | sk->sk_frag.page = NULL; | |
1724 | } | |
1725 | ||
109f6e39 EB |
1726 | if (sk->sk_peer_cred) |
1727 | put_cred(sk->sk_peer_cred); | |
1728 | put_pid(sk->sk_peer_pid); | |
26abe143 EB |
1729 | if (likely(sk->sk_net_refcnt)) |
1730 | put_net(sock_net(sk)); | |
c308c1b2 | 1731 | sk_prot_free(sk->sk_prot_creator, sk); |
1da177e4 | 1732 | } |
2b85a34e | 1733 | |
a4298e45 ED |
1734 | void sk_destruct(struct sock *sk) |
1735 | { | |
1736 | if (sock_flag(sk, SOCK_RCU_FREE)) | |
1737 | call_rcu(&sk->sk_rcu, __sk_destruct); | |
1738 | else | |
1739 | __sk_destruct(&sk->sk_rcu); | |
1740 | } | |
1741 | ||
eb4cb008 CG |
1742 | static void __sk_free(struct sock *sk) |
1743 | { | |
648845ab TZ |
1744 | if (likely(sk->sk_net_refcnt)) |
1745 | sock_inuse_add(sock_net(sk), -1); | |
1746 | ||
9709020c | 1747 | if (unlikely(sk->sk_net_refcnt && sock_diag_has_destroy_listeners(sk))) |
eb4cb008 CG |
1748 | sock_diag_broadcast_destroy(sk); |
1749 | else | |
1750 | sk_destruct(sk); | |
1751 | } | |
1752 | ||
2b85a34e ED |
1753 | void sk_free(struct sock *sk) |
1754 | { | |
1755 | /* | |
25985edc | 1756 | * We subtract one from sk_wmem_alloc and can know if |
2b85a34e ED |
1757 | * some packets are still in some tx queue. |
1758 | * If not null, sock_wfree() will call __sk_free(sk) later | |
1759 | */ | |
14afee4b | 1760 | if (refcount_dec_and_test(&sk->sk_wmem_alloc)) |
2b85a34e ED |
1761 | __sk_free(sk); |
1762 | } | |
2a91525c | 1763 | EXPORT_SYMBOL(sk_free); |
1da177e4 | 1764 | |
581319c5 PA |
1765 | static void sk_init_common(struct sock *sk) |
1766 | { | |
1767 | skb_queue_head_init(&sk->sk_receive_queue); | |
1768 | skb_queue_head_init(&sk->sk_write_queue); | |
1769 | skb_queue_head_init(&sk->sk_error_queue); | |
1770 | ||
1771 | rwlock_init(&sk->sk_callback_lock); | |
1772 | lockdep_set_class_and_name(&sk->sk_receive_queue.lock, | |
1773 | af_rlock_keys + sk->sk_family, | |
1774 | af_family_rlock_key_strings[sk->sk_family]); | |
1775 | lockdep_set_class_and_name(&sk->sk_write_queue.lock, | |
1776 | af_wlock_keys + sk->sk_family, | |
1777 | af_family_wlock_key_strings[sk->sk_family]); | |
1778 | lockdep_set_class_and_name(&sk->sk_error_queue.lock, | |
1779 | af_elock_keys + sk->sk_family, | |
1780 | af_family_elock_key_strings[sk->sk_family]); | |
1781 | lockdep_set_class_and_name(&sk->sk_callback_lock, | |
1782 | af_callback_keys + sk->sk_family, | |
1783 | af_family_clock_key_strings[sk->sk_family]); | |
1784 | } | |
1785 | ||
e56c57d0 ED |
1786 | /** |
1787 | * sk_clone_lock - clone a socket, and lock its clone | |
1788 | * @sk: the socket to clone | |
1789 | * @priority: for allocation (%GFP_KERNEL, %GFP_ATOMIC, etc) | |
1790 | * | |
1791 | * Caller must unlock socket even in error path (bh_unlock_sock(newsk)) | |
1792 | */ | |
1793 | struct sock *sk_clone_lock(const struct sock *sk, const gfp_t priority) | |
87d11ceb | 1794 | { |
8fd1d178 | 1795 | struct sock *newsk; |
278571ba | 1796 | bool is_charged = true; |
87d11ceb | 1797 | |
8fd1d178 | 1798 | newsk = sk_prot_alloc(sk->sk_prot, priority, sk->sk_family); |
87d11ceb ACM |
1799 | if (newsk != NULL) { |
1800 | struct sk_filter *filter; | |
1801 | ||
892c141e | 1802 | sock_copy(newsk, sk); |
87d11ceb | 1803 | |
9d538fa6 CP |
1804 | newsk->sk_prot_creator = sk->sk_prot; |
1805 | ||
87d11ceb | 1806 | /* SANITY */ |
8a681736 SV |
1807 | if (likely(newsk->sk_net_refcnt)) |
1808 | get_net(sock_net(newsk)); | |
87d11ceb ACM |
1809 | sk_node_init(&newsk->sk_node); |
1810 | sock_lock_init(newsk); | |
1811 | bh_lock_sock(newsk); | |
fa438ccf | 1812 | newsk->sk_backlog.head = newsk->sk_backlog.tail = NULL; |
8eae939f | 1813 | newsk->sk_backlog.len = 0; |
87d11ceb ACM |
1814 | |
1815 | atomic_set(&newsk->sk_rmem_alloc, 0); | |
2b85a34e ED |
1816 | /* |
1817 | * sk_wmem_alloc set to one (see sk_free() and sock_wfree()) | |
1818 | */ | |
14afee4b | 1819 | refcount_set(&newsk->sk_wmem_alloc, 1); |
87d11ceb | 1820 | atomic_set(&newsk->sk_omem_alloc, 0); |
581319c5 | 1821 | sk_init_common(newsk); |
87d11ceb ACM |
1822 | |
1823 | newsk->sk_dst_cache = NULL; | |
9b8805a3 | 1824 | newsk->sk_dst_pending_confirm = 0; |
87d11ceb ACM |
1825 | newsk->sk_wmem_queued = 0; |
1826 | newsk->sk_forward_alloc = 0; | |
9caad864 | 1827 | atomic_set(&newsk->sk_drops, 0); |
87d11ceb | 1828 | newsk->sk_send_head = NULL; |
87d11ceb | 1829 | newsk->sk_userlocks = sk->sk_userlocks & ~SOCK_BINDPORT_LOCK; |
52267790 | 1830 | atomic_set(&newsk->sk_zckey, 0); |
87d11ceb ACM |
1831 | |
1832 | sock_reset_flag(newsk, SOCK_DONE); | |
edbe69ef | 1833 | mem_cgroup_sk_alloc(newsk); |
c0576e39 | 1834 | cgroup_sk_alloc(&newsk->sk_cgrp_data); |
87d11ceb | 1835 | |
eefca20e ED |
1836 | rcu_read_lock(); |
1837 | filter = rcu_dereference(sk->sk_filter); | |
87d11ceb | 1838 | if (filter != NULL) |
278571ba AS |
1839 | /* though it's an empty new sock, the charging may fail |
1840 | * if sysctl_optmem_max was changed between creation of | |
1841 | * original socket and cloning | |
1842 | */ | |
1843 | is_charged = sk_filter_charge(newsk, filter); | |
eefca20e ED |
1844 | RCU_INIT_POINTER(newsk->sk_filter, filter); |
1845 | rcu_read_unlock(); | |
87d11ceb | 1846 | |
d188ba86 | 1847 | if (unlikely(!is_charged || xfrm_sk_clone_policy(newsk, sk))) { |
a97e50cc DB |
1848 | /* We need to make sure that we don't uncharge the new |
1849 | * socket if we couldn't charge it in the first place | |
1850 | * as otherwise we uncharge the parent's filter. | |
1851 | */ | |
1852 | if (!is_charged) | |
1853 | RCU_INIT_POINTER(newsk->sk_filter, NULL); | |
94352d45 | 1854 | sk_free_unlock_clone(newsk); |
87d11ceb ACM |
1855 | newsk = NULL; |
1856 | goto out; | |
1857 | } | |
fa463497 | 1858 | RCU_INIT_POINTER(newsk->sk_reuseport_cb, NULL); |
87d11ceb ACM |
1859 | |
1860 | newsk->sk_err = 0; | |
e551c32d | 1861 | newsk->sk_err_soft = 0; |
87d11ceb | 1862 | newsk->sk_priority = 0; |
2c8c56e1 | 1863 | newsk->sk_incoming_cpu = raw_smp_processor_id(); |
648845ab TZ |
1864 | if (likely(newsk->sk_net_refcnt)) |
1865 | sock_inuse_add(sock_net(newsk), 1); | |
d979a39d | 1866 | |
4dc6dc71 ED |
1867 | /* |
1868 | * Before updating sk_refcnt, we must commit prior changes to memory | |
1869 | * (Documentation/RCU/rculist_nulls.txt for details) | |
1870 | */ | |
1871 | smp_wmb(); | |
41c6d650 | 1872 | refcount_set(&newsk->sk_refcnt, 2); |
87d11ceb ACM |
1873 | |
1874 | /* | |
1875 | * Increment the counter in the same struct proto as the master | |
1876 | * sock (sk_refcnt_debug_inc uses newsk->sk_prot->socks, that | |
1877 | * is the same as sk->sk_prot->socks, as this field was copied | |
1878 | * with memcpy). | |
1879 | * | |
1880 | * This _changes_ the previous behaviour, where | |
1881 | * tcp_create_openreq_child always was incrementing the | |
1882 | * equivalent to tcp_prot->socks (inet_sock_nr), so this have | |
1883 | * to be taken into account in all callers. -acme | |
1884 | */ | |
1885 | sk_refcnt_debug_inc(newsk); | |
972692e0 | 1886 | sk_set_socket(newsk, NULL); |
c2f26e8f | 1887 | RCU_INIT_POINTER(newsk->sk_wq, NULL); |
87d11ceb ACM |
1888 | |
1889 | if (newsk->sk_prot->sockets_allocated) | |
180d8cd9 | 1890 | sk_sockets_allocated_inc(newsk); |
704da560 | 1891 | |
080a270f HFS |
1892 | if (sock_needs_netstamp(sk) && |
1893 | newsk->sk_flags & SK_FLAGS_TIMESTAMP) | |
704da560 | 1894 | net_enable_timestamp(); |
87d11ceb ACM |
1895 | } |
1896 | out: | |
1897 | return newsk; | |
1898 | } | |
e56c57d0 | 1899 | EXPORT_SYMBOL_GPL(sk_clone_lock); |
87d11ceb | 1900 | |
94352d45 ACM |
1901 | void sk_free_unlock_clone(struct sock *sk) |
1902 | { | |
1903 | /* It is still raw copy of parent, so invalidate | |
1904 | * destructor and make plain sk_free() */ | |
1905 | sk->sk_destruct = NULL; | |
1906 | bh_unlock_sock(sk); | |
1907 | sk_free(sk); | |
1908 | } | |
1909 | EXPORT_SYMBOL_GPL(sk_free_unlock_clone); | |
1910 | ||
9958089a AK |
1911 | void sk_setup_caps(struct sock *sk, struct dst_entry *dst) |
1912 | { | |
d6a4e26a ED |
1913 | u32 max_segs = 1; |
1914 | ||
6bd4f355 | 1915 | sk_dst_set(sk, dst); |
0a6b2a1d | 1916 | sk->sk_route_caps = dst->dev->features | sk->sk_route_forced_caps; |
9958089a | 1917 | if (sk->sk_route_caps & NETIF_F_GSO) |
4fcd6b99 | 1918 | sk->sk_route_caps |= NETIF_F_GSO_SOFTWARE; |
a465419b | 1919 | sk->sk_route_caps &= ~sk->sk_route_nocaps; |
9958089a | 1920 | if (sk_can_gso(sk)) { |
f70f250a | 1921 | if (dst->header_len && !xfrm_dst_offload_ok(dst)) { |
9958089a | 1922 | sk->sk_route_caps &= ~NETIF_F_GSO_MASK; |
82cc1a7a | 1923 | } else { |
9958089a | 1924 | sk->sk_route_caps |= NETIF_F_SG | NETIF_F_HW_CSUM; |
82cc1a7a | 1925 | sk->sk_gso_max_size = dst->dev->gso_max_size; |
d6a4e26a | 1926 | max_segs = max_t(u32, dst->dev->gso_max_segs, 1); |
82cc1a7a | 1927 | } |
9958089a | 1928 | } |
d6a4e26a | 1929 | sk->sk_gso_max_segs = max_segs; |
9958089a AK |
1930 | } |
1931 | EXPORT_SYMBOL_GPL(sk_setup_caps); | |
1932 | ||
1da177e4 LT |
1933 | /* |
1934 | * Simple resource managers for sockets. | |
1935 | */ | |
1936 | ||
1937 | ||
4ec93edb YH |
1938 | /* |
1939 | * Write buffer destructor automatically called from kfree_skb. | |
1da177e4 LT |
1940 | */ |
1941 | void sock_wfree(struct sk_buff *skb) | |
1942 | { | |
1943 | struct sock *sk = skb->sk; | |
d99927f4 | 1944 | unsigned int len = skb->truesize; |
1da177e4 | 1945 | |
d99927f4 ED |
1946 | if (!sock_flag(sk, SOCK_USE_WRITE_QUEUE)) { |
1947 | /* | |
1948 | * Keep a reference on sk_wmem_alloc, this will be released | |
1949 | * after sk_write_space() call | |
1950 | */ | |
14afee4b | 1951 | WARN_ON(refcount_sub_and_test(len - 1, &sk->sk_wmem_alloc)); |
1da177e4 | 1952 | sk->sk_write_space(sk); |
d99927f4 ED |
1953 | len = 1; |
1954 | } | |
2b85a34e | 1955 | /* |
d99927f4 ED |
1956 | * if sk_wmem_alloc reaches 0, we must finish what sk_free() |
1957 | * could not do because of in-flight packets | |
2b85a34e | 1958 | */ |
14afee4b | 1959 | if (refcount_sub_and_test(len, &sk->sk_wmem_alloc)) |
2b85a34e | 1960 | __sk_free(sk); |
1da177e4 | 1961 | } |
2a91525c | 1962 | EXPORT_SYMBOL(sock_wfree); |
1da177e4 | 1963 | |
1d2077ac ED |
1964 | /* This variant of sock_wfree() is used by TCP, |
1965 | * since it sets SOCK_USE_WRITE_QUEUE. | |
1966 | */ | |
1967 | void __sock_wfree(struct sk_buff *skb) | |
1968 | { | |
1969 | struct sock *sk = skb->sk; | |
1970 | ||
14afee4b | 1971 | if (refcount_sub_and_test(skb->truesize, &sk->sk_wmem_alloc)) |
1d2077ac ED |
1972 | __sk_free(sk); |
1973 | } | |
1974 | ||
9e17f8a4 ED |
1975 | void skb_set_owner_w(struct sk_buff *skb, struct sock *sk) |
1976 | { | |
1977 | skb_orphan(skb); | |
1978 | skb->sk = sk; | |
1979 | #ifdef CONFIG_INET | |
1980 | if (unlikely(!sk_fullsock(sk))) { | |
1981 | skb->destructor = sock_edemux; | |
1982 | sock_hold(sk); | |
1983 | return; | |
1984 | } | |
1985 | #endif | |
1986 | skb->destructor = sock_wfree; | |
1987 | skb_set_hash_from_sk(skb, sk); | |
1988 | /* | |
1989 | * We used to take a refcount on sk, but following operation | |
1990 | * is enough to guarantee sk_free() wont free this sock until | |
1991 | * all in-flight packets are completed | |
1992 | */ | |
14afee4b | 1993 | refcount_add(skb->truesize, &sk->sk_wmem_alloc); |
9e17f8a4 ED |
1994 | } |
1995 | EXPORT_SYMBOL(skb_set_owner_w); | |
1996 | ||
1d2077ac ED |
1997 | /* This helper is used by netem, as it can hold packets in its |
1998 | * delay queue. We want to allow the owner socket to send more | |
1999 | * packets, as if they were already TX completed by a typical driver. | |
2000 | * But we also want to keep skb->sk set because some packet schedulers | |
f6ba8d33 | 2001 | * rely on it (sch_fq for example). |
1d2077ac | 2002 | */ |
f2f872f9 ED |
2003 | void skb_orphan_partial(struct sk_buff *skb) |
2004 | { | |
f6ba8d33 | 2005 | if (skb_is_tcp_pure_ack(skb)) |
1d2077ac ED |
2006 | return; |
2007 | ||
f2f872f9 ED |
2008 | if (skb->destructor == sock_wfree |
2009 | #ifdef CONFIG_INET | |
2010 | || skb->destructor == tcp_wfree | |
2011 | #endif | |
2012 | ) { | |
f6ba8d33 ED |
2013 | struct sock *sk = skb->sk; |
2014 | ||
41c6d650 | 2015 | if (refcount_inc_not_zero(&sk->sk_refcnt)) { |
14afee4b | 2016 | WARN_ON(refcount_sub_and_test(skb->truesize, &sk->sk_wmem_alloc)); |
f6ba8d33 ED |
2017 | skb->destructor = sock_efree; |
2018 | } | |
f2f872f9 ED |
2019 | } else { |
2020 | skb_orphan(skb); | |
2021 | } | |
2022 | } | |
2023 | EXPORT_SYMBOL(skb_orphan_partial); | |
2024 | ||
4ec93edb YH |
2025 | /* |
2026 | * Read buffer destructor automatically called from kfree_skb. | |
1da177e4 LT |
2027 | */ |
2028 | void sock_rfree(struct sk_buff *skb) | |
2029 | { | |
2030 | struct sock *sk = skb->sk; | |
d361fd59 | 2031 | unsigned int len = skb->truesize; |
1da177e4 | 2032 | |
d361fd59 ED |
2033 | atomic_sub(len, &sk->sk_rmem_alloc); |
2034 | sk_mem_uncharge(sk, len); | |
1da177e4 | 2035 | } |
2a91525c | 2036 | EXPORT_SYMBOL(sock_rfree); |
1da177e4 | 2037 | |
7768eed8 OH |
2038 | /* |
2039 | * Buffer destructor for skbs that are not used directly in read or write | |
2040 | * path, e.g. for error handler skbs. Automatically called from kfree_skb. | |
2041 | */ | |
62bccb8c AD |
2042 | void sock_efree(struct sk_buff *skb) |
2043 | { | |
2044 | sock_put(skb->sk); | |
2045 | } | |
2046 | EXPORT_SYMBOL(sock_efree); | |
2047 | ||
976d0201 | 2048 | kuid_t sock_i_uid(struct sock *sk) |
1da177e4 | 2049 | { |
976d0201 | 2050 | kuid_t uid; |
1da177e4 | 2051 | |
f064af1e | 2052 | read_lock_bh(&sk->sk_callback_lock); |
976d0201 | 2053 | uid = sk->sk_socket ? SOCK_INODE(sk->sk_socket)->i_uid : GLOBAL_ROOT_UID; |
f064af1e | 2054 | read_unlock_bh(&sk->sk_callback_lock); |
1da177e4 LT |
2055 | return uid; |
2056 | } | |
2a91525c | 2057 | EXPORT_SYMBOL(sock_i_uid); |
1da177e4 LT |
2058 | |
2059 | unsigned long sock_i_ino(struct sock *sk) | |
2060 | { | |
2061 | unsigned long ino; | |
2062 | ||
f064af1e | 2063 | read_lock_bh(&sk->sk_callback_lock); |
1da177e4 | 2064 | ino = sk->sk_socket ? SOCK_INODE(sk->sk_socket)->i_ino : 0; |
f064af1e | 2065 | read_unlock_bh(&sk->sk_callback_lock); |
1da177e4 LT |
2066 | return ino; |
2067 | } | |
2a91525c | 2068 | EXPORT_SYMBOL(sock_i_ino); |
1da177e4 LT |
2069 | |
2070 | /* | |
2071 | * Allocate a skb from the socket's send buffer. | |
2072 | */ | |
86a76caf | 2073 | struct sk_buff *sock_wmalloc(struct sock *sk, unsigned long size, int force, |
dd0fc66f | 2074 | gfp_t priority) |
1da177e4 | 2075 | { |
14afee4b | 2076 | if (force || refcount_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf) { |
2a91525c | 2077 | struct sk_buff *skb = alloc_skb(size, priority); |
1da177e4 LT |
2078 | if (skb) { |
2079 | skb_set_owner_w(skb, sk); | |
2080 | return skb; | |
2081 | } | |
2082 | } | |
2083 | return NULL; | |
2084 | } | |
2a91525c | 2085 | EXPORT_SYMBOL(sock_wmalloc); |
1da177e4 | 2086 | |
98ba0bd5 WB |
2087 | static void sock_ofree(struct sk_buff *skb) |
2088 | { | |
2089 | struct sock *sk = skb->sk; | |
2090 | ||
2091 | atomic_sub(skb->truesize, &sk->sk_omem_alloc); | |
2092 | } | |
2093 | ||
2094 | struct sk_buff *sock_omalloc(struct sock *sk, unsigned long size, | |
2095 | gfp_t priority) | |
2096 | { | |
2097 | struct sk_buff *skb; | |
2098 | ||
2099 | /* small safe race: SKB_TRUESIZE may differ from final skb->truesize */ | |
2100 | if (atomic_read(&sk->sk_omem_alloc) + SKB_TRUESIZE(size) > | |
2101 | sysctl_optmem_max) | |
2102 | return NULL; | |
2103 | ||
2104 | skb = alloc_skb(size, priority); | |
2105 | if (!skb) | |
2106 | return NULL; | |
2107 | ||
2108 | atomic_add(skb->truesize, &sk->sk_omem_alloc); | |
2109 | skb->sk = sk; | |
2110 | skb->destructor = sock_ofree; | |
2111 | return skb; | |
2112 | } | |
2113 | ||
4ec93edb | 2114 | /* |
1da177e4 | 2115 | * Allocate a memory block from the socket's option memory buffer. |
4ec93edb | 2116 | */ |
dd0fc66f | 2117 | void *sock_kmalloc(struct sock *sk, int size, gfp_t priority) |
1da177e4 | 2118 | { |
95c96174 | 2119 | if ((unsigned int)size <= sysctl_optmem_max && |
1da177e4 LT |
2120 | atomic_read(&sk->sk_omem_alloc) + size < sysctl_optmem_max) { |
2121 | void *mem; | |
2122 | /* First do the add, to avoid the race if kmalloc | |
4ec93edb | 2123 | * might sleep. |
1da177e4 LT |
2124 | */ |
2125 | atomic_add(size, &sk->sk_omem_alloc); | |
2126 | mem = kmalloc(size, priority); | |
2127 | if (mem) | |
2128 | return mem; | |
2129 | atomic_sub(size, &sk->sk_omem_alloc); | |
2130 | } | |
2131 | return NULL; | |
2132 | } | |
2a91525c | 2133 | EXPORT_SYMBOL(sock_kmalloc); |
1da177e4 | 2134 | |
79e88659 DB |
2135 | /* Free an option memory block. Note, we actually want the inline |
2136 | * here as this allows gcc to detect the nullify and fold away the | |
2137 | * condition entirely. | |
1da177e4 | 2138 | */ |
79e88659 DB |
2139 | static inline void __sock_kfree_s(struct sock *sk, void *mem, int size, |
2140 | const bool nullify) | |
1da177e4 | 2141 | { |
e53da5fb DM |
2142 | if (WARN_ON_ONCE(!mem)) |
2143 | return; | |
79e88659 DB |
2144 | if (nullify) |
2145 | kzfree(mem); | |
2146 | else | |
2147 | kfree(mem); | |
1da177e4 LT |
2148 | atomic_sub(size, &sk->sk_omem_alloc); |
2149 | } | |
79e88659 DB |
2150 | |
2151 | void sock_kfree_s(struct sock *sk, void *mem, int size) | |
2152 | { | |
2153 | __sock_kfree_s(sk, mem, size, false); | |
2154 | } | |
2a91525c | 2155 | EXPORT_SYMBOL(sock_kfree_s); |
1da177e4 | 2156 | |
79e88659 DB |
2157 | void sock_kzfree_s(struct sock *sk, void *mem, int size) |
2158 | { | |
2159 | __sock_kfree_s(sk, mem, size, true); | |
2160 | } | |
2161 | EXPORT_SYMBOL(sock_kzfree_s); | |
2162 | ||
1da177e4 LT |
2163 | /* It is almost wait_for_tcp_memory minus release_sock/lock_sock. |
2164 | I think, these locks should be removed for datagram sockets. | |
2165 | */ | |
2a91525c | 2166 | static long sock_wait_for_wmem(struct sock *sk, long timeo) |
1da177e4 LT |
2167 | { |
2168 | DEFINE_WAIT(wait); | |
2169 | ||
9cd3e072 | 2170 | sk_clear_bit(SOCKWQ_ASYNC_NOSPACE, sk); |
1da177e4 LT |
2171 | for (;;) { |
2172 | if (!timeo) | |
2173 | break; | |
2174 | if (signal_pending(current)) | |
2175 | break; | |
2176 | set_bit(SOCK_NOSPACE, &sk->sk_socket->flags); | |
aa395145 | 2177 | prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE); |
14afee4b | 2178 | if (refcount_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf) |
1da177e4 LT |
2179 | break; |
2180 | if (sk->sk_shutdown & SEND_SHUTDOWN) | |
2181 | break; | |
2182 | if (sk->sk_err) | |
2183 | break; | |
2184 | timeo = schedule_timeout(timeo); | |
2185 | } | |
aa395145 | 2186 | finish_wait(sk_sleep(sk), &wait); |
1da177e4 LT |
2187 | return timeo; |
2188 | } | |
2189 | ||
2190 | ||
2191 | /* | |
2192 | * Generic send/receive buffer handlers | |
2193 | */ | |
2194 | ||
4cc7f68d HX |
2195 | struct sk_buff *sock_alloc_send_pskb(struct sock *sk, unsigned long header_len, |
2196 | unsigned long data_len, int noblock, | |
28d64271 | 2197 | int *errcode, int max_page_order) |
1da177e4 | 2198 | { |
2e4e4410 | 2199 | struct sk_buff *skb; |
1da177e4 LT |
2200 | long timeo; |
2201 | int err; | |
2202 | ||
1da177e4 | 2203 | timeo = sock_sndtimeo(sk, noblock); |
2e4e4410 | 2204 | for (;;) { |
1da177e4 LT |
2205 | err = sock_error(sk); |
2206 | if (err != 0) | |
2207 | goto failure; | |
2208 | ||
2209 | err = -EPIPE; | |
2210 | if (sk->sk_shutdown & SEND_SHUTDOWN) | |
2211 | goto failure; | |
2212 | ||
2e4e4410 ED |
2213 | if (sk_wmem_alloc_get(sk) < sk->sk_sndbuf) |
2214 | break; | |
28d64271 | 2215 | |
9cd3e072 | 2216 | sk_set_bit(SOCKWQ_ASYNC_NOSPACE, sk); |
2e4e4410 ED |
2217 | set_bit(SOCK_NOSPACE, &sk->sk_socket->flags); |
2218 | err = -EAGAIN; | |
2219 | if (!timeo) | |
1da177e4 | 2220 | goto failure; |
2e4e4410 ED |
2221 | if (signal_pending(current)) |
2222 | goto interrupted; | |
2223 | timeo = sock_wait_for_wmem(sk, timeo); | |
1da177e4 | 2224 | } |
2e4e4410 ED |
2225 | skb = alloc_skb_with_frags(header_len, data_len, max_page_order, |
2226 | errcode, sk->sk_allocation); | |
2227 | if (skb) | |
2228 | skb_set_owner_w(skb, sk); | |
1da177e4 LT |
2229 | return skb; |
2230 | ||
2231 | interrupted: | |
2232 | err = sock_intr_errno(timeo); | |
2233 | failure: | |
2234 | *errcode = err; | |
2235 | return NULL; | |
2236 | } | |
4cc7f68d | 2237 | EXPORT_SYMBOL(sock_alloc_send_pskb); |
1da177e4 | 2238 | |
4ec93edb | 2239 | struct sk_buff *sock_alloc_send_skb(struct sock *sk, unsigned long size, |
1da177e4 LT |
2240 | int noblock, int *errcode) |
2241 | { | |
28d64271 | 2242 | return sock_alloc_send_pskb(sk, size, 0, noblock, errcode, 0); |
1da177e4 | 2243 | } |
2a91525c | 2244 | EXPORT_SYMBOL(sock_alloc_send_skb); |
1da177e4 | 2245 | |
39771b12 WB |
2246 | int __sock_cmsg_send(struct sock *sk, struct msghdr *msg, struct cmsghdr *cmsg, |
2247 | struct sockcm_cookie *sockc) | |
2248 | { | |
3dd17e63 SHY |
2249 | u32 tsflags; |
2250 | ||
39771b12 WB |
2251 | switch (cmsg->cmsg_type) { |
2252 | case SO_MARK: | |
2253 | if (!ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN)) | |
2254 | return -EPERM; | |
2255 | if (cmsg->cmsg_len != CMSG_LEN(sizeof(u32))) | |
2256 | return -EINVAL; | |
2257 | sockc->mark = *(u32 *)CMSG_DATA(cmsg); | |
2258 | break; | |
7f1bc6e9 | 2259 | case SO_TIMESTAMPING_OLD: |
3dd17e63 SHY |
2260 | if (cmsg->cmsg_len != CMSG_LEN(sizeof(u32))) |
2261 | return -EINVAL; | |
2262 | ||
2263 | tsflags = *(u32 *)CMSG_DATA(cmsg); | |
2264 | if (tsflags & ~SOF_TIMESTAMPING_TX_RECORD_MASK) | |
2265 | return -EINVAL; | |
2266 | ||
2267 | sockc->tsflags &= ~SOF_TIMESTAMPING_TX_RECORD_MASK; | |
2268 | sockc->tsflags |= tsflags; | |
2269 | break; | |
80b14dee RC |
2270 | case SCM_TXTIME: |
2271 | if (!sock_flag(sk, SOCK_TXTIME)) | |
2272 | return -EINVAL; | |
2273 | if (cmsg->cmsg_len != CMSG_LEN(sizeof(u64))) | |
2274 | return -EINVAL; | |
2275 | sockc->transmit_time = get_unaligned((u64 *)CMSG_DATA(cmsg)); | |
2276 | break; | |
779f1ede SHY |
2277 | /* SCM_RIGHTS and SCM_CREDENTIALS are semantically in SOL_UNIX. */ |
2278 | case SCM_RIGHTS: | |
2279 | case SCM_CREDENTIALS: | |
2280 | break; | |
39771b12 WB |
2281 | default: |
2282 | return -EINVAL; | |
2283 | } | |
2284 | return 0; | |
2285 | } | |
2286 | EXPORT_SYMBOL(__sock_cmsg_send); | |
2287 | ||
f28ea365 EJ |
2288 | int sock_cmsg_send(struct sock *sk, struct msghdr *msg, |
2289 | struct sockcm_cookie *sockc) | |
2290 | { | |
2291 | struct cmsghdr *cmsg; | |
39771b12 | 2292 | int ret; |
f28ea365 EJ |
2293 | |
2294 | for_each_cmsghdr(cmsg, msg) { | |
2295 | if (!CMSG_OK(msg, cmsg)) | |
2296 | return -EINVAL; | |
2297 | if (cmsg->cmsg_level != SOL_SOCKET) | |
2298 | continue; | |
39771b12 WB |
2299 | ret = __sock_cmsg_send(sk, msg, cmsg, sockc); |
2300 | if (ret) | |
2301 | return ret; | |
f28ea365 EJ |
2302 | } |
2303 | return 0; | |
2304 | } | |
2305 | EXPORT_SYMBOL(sock_cmsg_send); | |
2306 | ||
06044751 ED |
2307 | static void sk_enter_memory_pressure(struct sock *sk) |
2308 | { | |
2309 | if (!sk->sk_prot->enter_memory_pressure) | |
2310 | return; | |
2311 | ||
2312 | sk->sk_prot->enter_memory_pressure(sk); | |
2313 | } | |
2314 | ||
2315 | static void sk_leave_memory_pressure(struct sock *sk) | |
2316 | { | |
2317 | if (sk->sk_prot->leave_memory_pressure) { | |
2318 | sk->sk_prot->leave_memory_pressure(sk); | |
2319 | } else { | |
2320 | unsigned long *memory_pressure = sk->sk_prot->memory_pressure; | |
2321 | ||
2322 | if (memory_pressure && *memory_pressure) | |
2323 | *memory_pressure = 0; | |
2324 | } | |
2325 | } | |
2326 | ||
5640f768 ED |
2327 | /* On 32bit arches, an skb frag is limited to 2^15 */ |
2328 | #define SKB_FRAG_PAGE_ORDER get_order(32768) | |
2329 | ||
400dfd3a ED |
2330 | /** |
2331 | * skb_page_frag_refill - check that a page_frag contains enough room | |
2332 | * @sz: minimum size of the fragment we want to get | |
2333 | * @pfrag: pointer to page_frag | |
82d5e2b8 | 2334 | * @gfp: priority for memory allocation |
400dfd3a ED |
2335 | * |
2336 | * Note: While this allocator tries to use high order pages, there is | |
2337 | * no guarantee that allocations succeed. Therefore, @sz MUST be | |
2338 | * less or equal than PAGE_SIZE. | |
2339 | */ | |
d9b2938a | 2340 | bool skb_page_frag_refill(unsigned int sz, struct page_frag *pfrag, gfp_t gfp) |
5640f768 | 2341 | { |
5640f768 | 2342 | if (pfrag->page) { |
fe896d18 | 2343 | if (page_ref_count(pfrag->page) == 1) { |
5640f768 ED |
2344 | pfrag->offset = 0; |
2345 | return true; | |
2346 | } | |
400dfd3a | 2347 | if (pfrag->offset + sz <= pfrag->size) |
5640f768 ED |
2348 | return true; |
2349 | put_page(pfrag->page); | |
2350 | } | |
2351 | ||
d9b2938a ED |
2352 | pfrag->offset = 0; |
2353 | if (SKB_FRAG_PAGE_ORDER) { | |
d0164adc MG |
2354 | /* Avoid direct reclaim but allow kswapd to wake */ |
2355 | pfrag->page = alloc_pages((gfp & ~__GFP_DIRECT_RECLAIM) | | |
2356 | __GFP_COMP | __GFP_NOWARN | | |
2357 | __GFP_NORETRY, | |
d9b2938a | 2358 | SKB_FRAG_PAGE_ORDER); |
5640f768 | 2359 | if (likely(pfrag->page)) { |
d9b2938a | 2360 | pfrag->size = PAGE_SIZE << SKB_FRAG_PAGE_ORDER; |
5640f768 ED |
2361 | return true; |
2362 | } | |
d9b2938a ED |
2363 | } |
2364 | pfrag->page = alloc_page(gfp); | |
2365 | if (likely(pfrag->page)) { | |
2366 | pfrag->size = PAGE_SIZE; | |
2367 | return true; | |
2368 | } | |
400dfd3a ED |
2369 | return false; |
2370 | } | |
2371 | EXPORT_SYMBOL(skb_page_frag_refill); | |
2372 | ||
2373 | bool sk_page_frag_refill(struct sock *sk, struct page_frag *pfrag) | |
2374 | { | |
2375 | if (likely(skb_page_frag_refill(32U, pfrag, sk->sk_allocation))) | |
2376 | return true; | |
2377 | ||
5640f768 ED |
2378 | sk_enter_memory_pressure(sk); |
2379 | sk_stream_moderate_sndbuf(sk); | |
2380 | return false; | |
2381 | } | |
2382 | EXPORT_SYMBOL(sk_page_frag_refill); | |
2383 | ||
1da177e4 | 2384 | static void __lock_sock(struct sock *sk) |
f39234d6 NK |
2385 | __releases(&sk->sk_lock.slock) |
2386 | __acquires(&sk->sk_lock.slock) | |
1da177e4 LT |
2387 | { |
2388 | DEFINE_WAIT(wait); | |
2389 | ||
e71a4783 | 2390 | for (;;) { |
1da177e4 LT |
2391 | prepare_to_wait_exclusive(&sk->sk_lock.wq, &wait, |
2392 | TASK_UNINTERRUPTIBLE); | |
2393 | spin_unlock_bh(&sk->sk_lock.slock); | |
2394 | schedule(); | |
2395 | spin_lock_bh(&sk->sk_lock.slock); | |
e71a4783 | 2396 | if (!sock_owned_by_user(sk)) |
1da177e4 LT |
2397 | break; |
2398 | } | |
2399 | finish_wait(&sk->sk_lock.wq, &wait); | |
2400 | } | |
2401 | ||
8873c064 | 2402 | void __release_sock(struct sock *sk) |
f39234d6 NK |
2403 | __releases(&sk->sk_lock.slock) |
2404 | __acquires(&sk->sk_lock.slock) | |
1da177e4 | 2405 | { |
5413d1ba | 2406 | struct sk_buff *skb, *next; |
1da177e4 | 2407 | |
5413d1ba | 2408 | while ((skb = sk->sk_backlog.head) != NULL) { |
1da177e4 | 2409 | sk->sk_backlog.head = sk->sk_backlog.tail = NULL; |
1da177e4 | 2410 | |
5413d1ba | 2411 | spin_unlock_bh(&sk->sk_lock.slock); |
1da177e4 | 2412 | |
5413d1ba ED |
2413 | do { |
2414 | next = skb->next; | |
e4cbb02a | 2415 | prefetch(next); |
7fee226a | 2416 | WARN_ON_ONCE(skb_dst_is_noref(skb)); |
a8305bff | 2417 | skb_mark_not_on_list(skb); |
c57943a1 | 2418 | sk_backlog_rcv(sk, skb); |
1da177e4 | 2419 | |
5413d1ba | 2420 | cond_resched(); |
1da177e4 LT |
2421 | |
2422 | skb = next; | |
2423 | } while (skb != NULL); | |
2424 | ||
5413d1ba ED |
2425 | spin_lock_bh(&sk->sk_lock.slock); |
2426 | } | |
8eae939f ZY |
2427 | |
2428 | /* | |
2429 | * Doing the zeroing here guarantee we can not loop forever | |
2430 | * while a wild producer attempts to flood us. | |
2431 | */ | |
2432 | sk->sk_backlog.len = 0; | |
1da177e4 LT |
2433 | } |
2434 | ||
d41a69f1 ED |
2435 | void __sk_flush_backlog(struct sock *sk) |
2436 | { | |
2437 | spin_lock_bh(&sk->sk_lock.slock); | |
2438 | __release_sock(sk); | |
2439 | spin_unlock_bh(&sk->sk_lock.slock); | |
2440 | } | |
2441 | ||
1da177e4 LT |
2442 | /** |
2443 | * sk_wait_data - wait for data to arrive at sk_receive_queue | |
4dc3b16b PP |
2444 | * @sk: sock to wait on |
2445 | * @timeo: for how long | |
dfbafc99 | 2446 | * @skb: last skb seen on sk_receive_queue |
1da177e4 LT |
2447 | * |
2448 | * Now socket state including sk->sk_err is changed only under lock, | |
2449 | * hence we may omit checks after joining wait queue. | |
2450 | * We check receive queue before schedule() only as optimization; | |
2451 | * it is very likely that release_sock() added new data. | |
2452 | */ | |
dfbafc99 | 2453 | int sk_wait_data(struct sock *sk, long *timeo, const struct sk_buff *skb) |
1da177e4 | 2454 | { |
d9dc8b0f | 2455 | DEFINE_WAIT_FUNC(wait, woken_wake_function); |
1da177e4 | 2456 | int rc; |
1da177e4 | 2457 | |
d9dc8b0f | 2458 | add_wait_queue(sk_sleep(sk), &wait); |
9cd3e072 | 2459 | sk_set_bit(SOCKWQ_ASYNC_WAITDATA, sk); |
d9dc8b0f | 2460 | rc = sk_wait_event(sk, timeo, skb_peek_tail(&sk->sk_receive_queue) != skb, &wait); |
9cd3e072 | 2461 | sk_clear_bit(SOCKWQ_ASYNC_WAITDATA, sk); |
d9dc8b0f | 2462 | remove_wait_queue(sk_sleep(sk), &wait); |
1da177e4 LT |
2463 | return rc; |
2464 | } | |
1da177e4 LT |
2465 | EXPORT_SYMBOL(sk_wait_data); |
2466 | ||
3ab224be | 2467 | /** |
f8c3bf00 | 2468 | * __sk_mem_raise_allocated - increase memory_allocated |
3ab224be HA |
2469 | * @sk: socket |
2470 | * @size: memory size to allocate | |
f8c3bf00 | 2471 | * @amt: pages to allocate |
3ab224be HA |
2472 | * @kind: allocation type |
2473 | * | |
f8c3bf00 | 2474 | * Similar to __sk_mem_schedule(), but does not update sk_forward_alloc |
3ab224be | 2475 | */ |
f8c3bf00 | 2476 | int __sk_mem_raise_allocated(struct sock *sk, int size, int amt, int kind) |
3ab224be HA |
2477 | { |
2478 | struct proto *prot = sk->sk_prot; | |
f8c3bf00 | 2479 | long allocated = sk_memory_allocated_add(sk, amt); |
d6f19938 | 2480 | bool charged = true; |
e805605c | 2481 | |
baac50bb | 2482 | if (mem_cgroup_sockets_enabled && sk->sk_memcg && |
d6f19938 | 2483 | !(charged = mem_cgroup_charge_skmem(sk->sk_memcg, amt))) |
e805605c | 2484 | goto suppress_allocation; |
3ab224be HA |
2485 | |
2486 | /* Under limit. */ | |
e805605c | 2487 | if (allocated <= sk_prot_mem_limits(sk, 0)) { |
180d8cd9 | 2488 | sk_leave_memory_pressure(sk); |
3ab224be HA |
2489 | return 1; |
2490 | } | |
2491 | ||
e805605c JW |
2492 | /* Under pressure. */ |
2493 | if (allocated > sk_prot_mem_limits(sk, 1)) | |
180d8cd9 | 2494 | sk_enter_memory_pressure(sk); |
3ab224be | 2495 | |
e805605c JW |
2496 | /* Over hard limit. */ |
2497 | if (allocated > sk_prot_mem_limits(sk, 2)) | |
3ab224be HA |
2498 | goto suppress_allocation; |
2499 | ||
2500 | /* guarantee minimum buffer size under pressure */ | |
2501 | if (kind == SK_MEM_RECV) { | |
a3dcaf17 | 2502 | if (atomic_read(&sk->sk_rmem_alloc) < sk_get_rmem0(sk, prot)) |
3ab224be | 2503 | return 1; |
180d8cd9 | 2504 | |
3ab224be | 2505 | } else { /* SK_MEM_SEND */ |
a3dcaf17 ED |
2506 | int wmem0 = sk_get_wmem0(sk, prot); |
2507 | ||
3ab224be | 2508 | if (sk->sk_type == SOCK_STREAM) { |
a3dcaf17 | 2509 | if (sk->sk_wmem_queued < wmem0) |
3ab224be | 2510 | return 1; |
a3dcaf17 | 2511 | } else if (refcount_read(&sk->sk_wmem_alloc) < wmem0) { |
3ab224be | 2512 | return 1; |
a3dcaf17 | 2513 | } |
3ab224be HA |
2514 | } |
2515 | ||
180d8cd9 | 2516 | if (sk_has_memory_pressure(sk)) { |
5bf325a5 | 2517 | u64 alloc; |
1748376b | 2518 | |
180d8cd9 | 2519 | if (!sk_under_memory_pressure(sk)) |
1748376b | 2520 | return 1; |
180d8cd9 GC |
2521 | alloc = sk_sockets_allocated_read_positive(sk); |
2522 | if (sk_prot_mem_limits(sk, 2) > alloc * | |
3ab224be HA |
2523 | sk_mem_pages(sk->sk_wmem_queued + |
2524 | atomic_read(&sk->sk_rmem_alloc) + | |
2525 | sk->sk_forward_alloc)) | |
2526 | return 1; | |
2527 | } | |
2528 | ||
2529 | suppress_allocation: | |
2530 | ||
2531 | if (kind == SK_MEM_SEND && sk->sk_type == SOCK_STREAM) { | |
2532 | sk_stream_moderate_sndbuf(sk); | |
2533 | ||
2534 | /* Fail only if socket is _under_ its sndbuf. | |
2535 | * In this case we cannot block, so that we have to fail. | |
2536 | */ | |
2537 | if (sk->sk_wmem_queued + size >= sk->sk_sndbuf) | |
2538 | return 1; | |
2539 | } | |
2540 | ||
d6f19938 YS |
2541 | if (kind == SK_MEM_SEND || (kind == SK_MEM_RECV && charged)) |
2542 | trace_sock_exceed_buf_limit(sk, prot, allocated, kind); | |
3847ce32 | 2543 | |
0e90b31f | 2544 | sk_memory_allocated_sub(sk, amt); |
180d8cd9 | 2545 | |
baac50bb JW |
2546 | if (mem_cgroup_sockets_enabled && sk->sk_memcg) |
2547 | mem_cgroup_uncharge_skmem(sk->sk_memcg, amt); | |
e805605c | 2548 | |
3ab224be HA |
2549 | return 0; |
2550 | } | |
f8c3bf00 PA |
2551 | EXPORT_SYMBOL(__sk_mem_raise_allocated); |
2552 | ||
2553 | /** | |
2554 | * __sk_mem_schedule - increase sk_forward_alloc and memory_allocated | |
2555 | * @sk: socket | |
2556 | * @size: memory size to allocate | |
2557 | * @kind: allocation type | |
2558 | * | |
2559 | * If kind is SK_MEM_SEND, it means wmem allocation. Otherwise it means | |
2560 | * rmem allocation. This function assumes that protocols which have | |
2561 | * memory_pressure use sk_wmem_queued as write buffer accounting. | |
2562 | */ | |
2563 | int __sk_mem_schedule(struct sock *sk, int size, int kind) | |
2564 | { | |
2565 | int ret, amt = sk_mem_pages(size); | |
2566 | ||
2567 | sk->sk_forward_alloc += amt << SK_MEM_QUANTUM_SHIFT; | |
2568 | ret = __sk_mem_raise_allocated(sk, size, amt, kind); | |
2569 | if (!ret) | |
2570 | sk->sk_forward_alloc -= amt << SK_MEM_QUANTUM_SHIFT; | |
2571 | return ret; | |
2572 | } | |
3ab224be HA |
2573 | EXPORT_SYMBOL(__sk_mem_schedule); |
2574 | ||
2575 | /** | |
f8c3bf00 | 2576 | * __sk_mem_reduce_allocated - reclaim memory_allocated |
3ab224be | 2577 | * @sk: socket |
f8c3bf00 PA |
2578 | * @amount: number of quanta |
2579 | * | |
2580 | * Similar to __sk_mem_reclaim(), but does not update sk_forward_alloc | |
3ab224be | 2581 | */ |
f8c3bf00 | 2582 | void __sk_mem_reduce_allocated(struct sock *sk, int amount) |
3ab224be | 2583 | { |
1a24e04e | 2584 | sk_memory_allocated_sub(sk, amount); |
3ab224be | 2585 | |
baac50bb JW |
2586 | if (mem_cgroup_sockets_enabled && sk->sk_memcg) |
2587 | mem_cgroup_uncharge_skmem(sk->sk_memcg, amount); | |
e805605c | 2588 | |
180d8cd9 GC |
2589 | if (sk_under_memory_pressure(sk) && |
2590 | (sk_memory_allocated(sk) < sk_prot_mem_limits(sk, 0))) | |
2591 | sk_leave_memory_pressure(sk); | |
3ab224be | 2592 | } |
f8c3bf00 PA |
2593 | EXPORT_SYMBOL(__sk_mem_reduce_allocated); |
2594 | ||
2595 | /** | |
2596 | * __sk_mem_reclaim - reclaim sk_forward_alloc and memory_allocated | |
2597 | * @sk: socket | |
2598 | * @amount: number of bytes (rounded down to a SK_MEM_QUANTUM multiple) | |
2599 | */ | |
2600 | void __sk_mem_reclaim(struct sock *sk, int amount) | |
2601 | { | |
2602 | amount >>= SK_MEM_QUANTUM_SHIFT; | |
2603 | sk->sk_forward_alloc -= amount << SK_MEM_QUANTUM_SHIFT; | |
2604 | __sk_mem_reduce_allocated(sk, amount); | |
2605 | } | |
3ab224be HA |
2606 | EXPORT_SYMBOL(__sk_mem_reclaim); |
2607 | ||
627d2d6b | 2608 | int sk_set_peek_off(struct sock *sk, int val) |
2609 | { | |
627d2d6b | 2610 | sk->sk_peek_off = val; |
2611 | return 0; | |
2612 | } | |
2613 | EXPORT_SYMBOL_GPL(sk_set_peek_off); | |
3ab224be | 2614 | |
1da177e4 LT |
2615 | /* |
2616 | * Set of default routines for initialising struct proto_ops when | |
2617 | * the protocol does not support a particular function. In certain | |
2618 | * cases where it makes no sense for a protocol to have a "do nothing" | |
2619 | * function, some default processing is provided. | |
2620 | */ | |
2621 | ||
2622 | int sock_no_bind(struct socket *sock, struct sockaddr *saddr, int len) | |
2623 | { | |
2624 | return -EOPNOTSUPP; | |
2625 | } | |
2a91525c | 2626 | EXPORT_SYMBOL(sock_no_bind); |
1da177e4 | 2627 | |
4ec93edb | 2628 | int sock_no_connect(struct socket *sock, struct sockaddr *saddr, |
1da177e4 LT |
2629 | int len, int flags) |
2630 | { | |
2631 | return -EOPNOTSUPP; | |
2632 | } | |
2a91525c | 2633 | EXPORT_SYMBOL(sock_no_connect); |
1da177e4 LT |
2634 | |
2635 | int sock_no_socketpair(struct socket *sock1, struct socket *sock2) | |
2636 | { | |
2637 | return -EOPNOTSUPP; | |
2638 | } | |
2a91525c | 2639 | EXPORT_SYMBOL(sock_no_socketpair); |
1da177e4 | 2640 | |
cdfbabfb DH |
2641 | int sock_no_accept(struct socket *sock, struct socket *newsock, int flags, |
2642 | bool kern) | |
1da177e4 LT |
2643 | { |
2644 | return -EOPNOTSUPP; | |
2645 | } | |
2a91525c | 2646 | EXPORT_SYMBOL(sock_no_accept); |
1da177e4 | 2647 | |
4ec93edb | 2648 | int sock_no_getname(struct socket *sock, struct sockaddr *saddr, |
9b2c45d4 | 2649 | int peer) |
1da177e4 LT |
2650 | { |
2651 | return -EOPNOTSUPP; | |
2652 | } | |
2a91525c | 2653 | EXPORT_SYMBOL(sock_no_getname); |
1da177e4 | 2654 | |
1da177e4 LT |
2655 | int sock_no_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg) |
2656 | { | |
2657 | return -EOPNOTSUPP; | |
2658 | } | |
2a91525c | 2659 | EXPORT_SYMBOL(sock_no_ioctl); |
1da177e4 LT |
2660 | |
2661 | int sock_no_listen(struct socket *sock, int backlog) | |
2662 | { | |
2663 | return -EOPNOTSUPP; | |
2664 | } | |
2a91525c | 2665 | EXPORT_SYMBOL(sock_no_listen); |
1da177e4 LT |
2666 | |
2667 | int sock_no_shutdown(struct socket *sock, int how) | |
2668 | { | |
2669 | return -EOPNOTSUPP; | |
2670 | } | |
2a91525c | 2671 | EXPORT_SYMBOL(sock_no_shutdown); |
1da177e4 LT |
2672 | |
2673 | int sock_no_setsockopt(struct socket *sock, int level, int optname, | |
b7058842 | 2674 | char __user *optval, unsigned int optlen) |
1da177e4 LT |
2675 | { |
2676 | return -EOPNOTSUPP; | |
2677 | } | |
2a91525c | 2678 | EXPORT_SYMBOL(sock_no_setsockopt); |
1da177e4 LT |
2679 | |
2680 | int sock_no_getsockopt(struct socket *sock, int level, int optname, | |
2681 | char __user *optval, int __user *optlen) | |
2682 | { | |
2683 | return -EOPNOTSUPP; | |
2684 | } | |
2a91525c | 2685 | EXPORT_SYMBOL(sock_no_getsockopt); |
1da177e4 | 2686 | |
1b784140 | 2687 | int sock_no_sendmsg(struct socket *sock, struct msghdr *m, size_t len) |
1da177e4 LT |
2688 | { |
2689 | return -EOPNOTSUPP; | |
2690 | } | |
2a91525c | 2691 | EXPORT_SYMBOL(sock_no_sendmsg); |
1da177e4 | 2692 | |
306b13eb TH |
2693 | int sock_no_sendmsg_locked(struct sock *sk, struct msghdr *m, size_t len) |
2694 | { | |
2695 | return -EOPNOTSUPP; | |
2696 | } | |
2697 | EXPORT_SYMBOL(sock_no_sendmsg_locked); | |
2698 | ||
1b784140 YX |
2699 | int sock_no_recvmsg(struct socket *sock, struct msghdr *m, size_t len, |
2700 | int flags) | |
1da177e4 LT |
2701 | { |
2702 | return -EOPNOTSUPP; | |
2703 | } | |
2a91525c | 2704 | EXPORT_SYMBOL(sock_no_recvmsg); |
1da177e4 LT |
2705 | |
2706 | int sock_no_mmap(struct file *file, struct socket *sock, struct vm_area_struct *vma) | |
2707 | { | |
2708 | /* Mirror missing mmap method error code */ | |
2709 | return -ENODEV; | |
2710 | } | |
2a91525c | 2711 | EXPORT_SYMBOL(sock_no_mmap); |
1da177e4 LT |
2712 | |
2713 | ssize_t sock_no_sendpage(struct socket *sock, struct page *page, int offset, size_t size, int flags) | |
2714 | { | |
2715 | ssize_t res; | |
2716 | struct msghdr msg = {.msg_flags = flags}; | |
2717 | struct kvec iov; | |
2718 | char *kaddr = kmap(page); | |
2719 | iov.iov_base = kaddr + offset; | |
2720 | iov.iov_len = size; | |
2721 | res = kernel_sendmsg(sock, &msg, &iov, 1, size); | |
2722 | kunmap(page); | |
2723 | return res; | |
2724 | } | |
2a91525c | 2725 | EXPORT_SYMBOL(sock_no_sendpage); |
1da177e4 | 2726 | |
306b13eb TH |
2727 | ssize_t sock_no_sendpage_locked(struct sock *sk, struct page *page, |
2728 | int offset, size_t size, int flags) | |
2729 | { | |
2730 | ssize_t res; | |
2731 | struct msghdr msg = {.msg_flags = flags}; | |
2732 | struct kvec iov; | |
2733 | char *kaddr = kmap(page); | |
2734 | ||
2735 | iov.iov_base = kaddr + offset; | |
2736 | iov.iov_len = size; | |
2737 | res = kernel_sendmsg_locked(sk, &msg, &iov, 1, size); | |
2738 | kunmap(page); | |
2739 | return res; | |
2740 | } | |
2741 | EXPORT_SYMBOL(sock_no_sendpage_locked); | |
2742 | ||
1da177e4 LT |
2743 | /* |
2744 | * Default Socket Callbacks | |
2745 | */ | |
2746 | ||
2747 | static void sock_def_wakeup(struct sock *sk) | |
2748 | { | |
43815482 ED |
2749 | struct socket_wq *wq; |
2750 | ||
2751 | rcu_read_lock(); | |
2752 | wq = rcu_dereference(sk->sk_wq); | |
1ce0bf50 | 2753 | if (skwq_has_sleeper(wq)) |
43815482 ED |
2754 | wake_up_interruptible_all(&wq->wait); |
2755 | rcu_read_unlock(); | |
1da177e4 LT |
2756 | } |
2757 | ||
2758 | static void sock_def_error_report(struct sock *sk) | |
2759 | { | |
43815482 ED |
2760 | struct socket_wq *wq; |
2761 | ||
2762 | rcu_read_lock(); | |
2763 | wq = rcu_dereference(sk->sk_wq); | |
1ce0bf50 | 2764 | if (skwq_has_sleeper(wq)) |
a9a08845 | 2765 | wake_up_interruptible_poll(&wq->wait, EPOLLERR); |
8d8ad9d7 | 2766 | sk_wake_async(sk, SOCK_WAKE_IO, POLL_ERR); |
43815482 | 2767 | rcu_read_unlock(); |
1da177e4 LT |
2768 | } |
2769 | ||
676d2369 | 2770 | static void sock_def_readable(struct sock *sk) |
1da177e4 | 2771 | { |
43815482 ED |
2772 | struct socket_wq *wq; |
2773 | ||
2774 | rcu_read_lock(); | |
2775 | wq = rcu_dereference(sk->sk_wq); | |
1ce0bf50 | 2776 | if (skwq_has_sleeper(wq)) |
a9a08845 LT |
2777 | wake_up_interruptible_sync_poll(&wq->wait, EPOLLIN | EPOLLPRI | |
2778 | EPOLLRDNORM | EPOLLRDBAND); | |
8d8ad9d7 | 2779 | sk_wake_async(sk, SOCK_WAKE_WAITD, POLL_IN); |
43815482 | 2780 | rcu_read_unlock(); |
1da177e4 LT |
2781 | } |
2782 | ||
2783 | static void sock_def_write_space(struct sock *sk) | |
2784 | { | |
43815482 ED |
2785 | struct socket_wq *wq; |
2786 | ||
2787 | rcu_read_lock(); | |
1da177e4 LT |
2788 | |
2789 | /* Do not wake up a writer until he can make "significant" | |
2790 | * progress. --DaveM | |
2791 | */ | |
14afee4b | 2792 | if ((refcount_read(&sk->sk_wmem_alloc) << 1) <= sk->sk_sndbuf) { |
43815482 | 2793 | wq = rcu_dereference(sk->sk_wq); |
1ce0bf50 | 2794 | if (skwq_has_sleeper(wq)) |
a9a08845 LT |
2795 | wake_up_interruptible_sync_poll(&wq->wait, EPOLLOUT | |
2796 | EPOLLWRNORM | EPOLLWRBAND); | |
1da177e4 LT |
2797 | |
2798 | /* Should agree with poll, otherwise some programs break */ | |
2799 | if (sock_writeable(sk)) | |
8d8ad9d7 | 2800 | sk_wake_async(sk, SOCK_WAKE_SPACE, POLL_OUT); |
1da177e4 LT |
2801 | } |
2802 | ||
43815482 | 2803 | rcu_read_unlock(); |
1da177e4 LT |
2804 | } |
2805 | ||
2806 | static void sock_def_destruct(struct sock *sk) | |
2807 | { | |
1da177e4 LT |
2808 | } |
2809 | ||
2810 | void sk_send_sigurg(struct sock *sk) | |
2811 | { | |
2812 | if (sk->sk_socket && sk->sk_socket->file) | |
2813 | if (send_sigurg(&sk->sk_socket->file->f_owner)) | |
8d8ad9d7 | 2814 | sk_wake_async(sk, SOCK_WAKE_URG, POLL_PRI); |
1da177e4 | 2815 | } |
2a91525c | 2816 | EXPORT_SYMBOL(sk_send_sigurg); |
1da177e4 LT |
2817 | |
2818 | void sk_reset_timer(struct sock *sk, struct timer_list* timer, | |
2819 | unsigned long expires) | |
2820 | { | |
2821 | if (!mod_timer(timer, expires)) | |
2822 | sock_hold(sk); | |
2823 | } | |
1da177e4 LT |
2824 | EXPORT_SYMBOL(sk_reset_timer); |
2825 | ||
2826 | void sk_stop_timer(struct sock *sk, struct timer_list* timer) | |
2827 | { | |
25cc4ae9 | 2828 | if (del_timer(timer)) |
1da177e4 LT |
2829 | __sock_put(sk); |
2830 | } | |
1da177e4 LT |
2831 | EXPORT_SYMBOL(sk_stop_timer); |
2832 | ||
2833 | void sock_init_data(struct socket *sock, struct sock *sk) | |
2834 | { | |
581319c5 | 2835 | sk_init_common(sk); |
1da177e4 LT |
2836 | sk->sk_send_head = NULL; |
2837 | ||
99767f27 | 2838 | timer_setup(&sk->sk_timer, NULL, 0); |
4ec93edb | 2839 | |
1da177e4 LT |
2840 | sk->sk_allocation = GFP_KERNEL; |
2841 | sk->sk_rcvbuf = sysctl_rmem_default; | |
2842 | sk->sk_sndbuf = sysctl_wmem_default; | |
2843 | sk->sk_state = TCP_CLOSE; | |
972692e0 | 2844 | sk_set_socket(sk, sock); |
1da177e4 LT |
2845 | |
2846 | sock_set_flag(sk, SOCK_ZAPPED); | |
2847 | ||
e71a4783 | 2848 | if (sock) { |
1da177e4 | 2849 | sk->sk_type = sock->type; |
c2f26e8f | 2850 | RCU_INIT_POINTER(sk->sk_wq, sock->wq); |
1da177e4 | 2851 | sock->sk = sk; |
86741ec2 LC |
2852 | sk->sk_uid = SOCK_INODE(sock)->i_uid; |
2853 | } else { | |
c2f26e8f | 2854 | RCU_INIT_POINTER(sk->sk_wq, NULL); |
86741ec2 LC |
2855 | sk->sk_uid = make_kuid(sock_net(sk)->user_ns, 0); |
2856 | } | |
1da177e4 | 2857 | |
1da177e4 | 2858 | rwlock_init(&sk->sk_callback_lock); |
cdfbabfb DH |
2859 | if (sk->sk_kern_sock) |
2860 | lockdep_set_class_and_name( | |
2861 | &sk->sk_callback_lock, | |
2862 | af_kern_callback_keys + sk->sk_family, | |
2863 | af_family_kern_clock_key_strings[sk->sk_family]); | |
2864 | else | |
2865 | lockdep_set_class_and_name( | |
2866 | &sk->sk_callback_lock, | |
443aef0e PZ |
2867 | af_callback_keys + sk->sk_family, |
2868 | af_family_clock_key_strings[sk->sk_family]); | |
1da177e4 LT |
2869 | |
2870 | sk->sk_state_change = sock_def_wakeup; | |
2871 | sk->sk_data_ready = sock_def_readable; | |
2872 | sk->sk_write_space = sock_def_write_space; | |
2873 | sk->sk_error_report = sock_def_error_report; | |
2874 | sk->sk_destruct = sock_def_destruct; | |
2875 | ||
5640f768 ED |
2876 | sk->sk_frag.page = NULL; |
2877 | sk->sk_frag.offset = 0; | |
ef64a54f | 2878 | sk->sk_peek_off = -1; |
1da177e4 | 2879 | |
109f6e39 EB |
2880 | sk->sk_peer_pid = NULL; |
2881 | sk->sk_peer_cred = NULL; | |
1da177e4 LT |
2882 | sk->sk_write_pending = 0; |
2883 | sk->sk_rcvlowat = 1; | |
2884 | sk->sk_rcvtimeo = MAX_SCHEDULE_TIMEOUT; | |
2885 | sk->sk_sndtimeo = MAX_SCHEDULE_TIMEOUT; | |
2886 | ||
6c7c98ba | 2887 | sk->sk_stamp = SK_DEFAULT_STAMP; |
3a0ed3e9 DD |
2888 | #if BITS_PER_LONG==32 |
2889 | seqlock_init(&sk->sk_stamp_seq); | |
2890 | #endif | |
52267790 | 2891 | atomic_set(&sk->sk_zckey, 0); |
1da177e4 | 2892 | |
e0d1095a | 2893 | #ifdef CONFIG_NET_RX_BUSY_POLL |
06021292 | 2894 | sk->sk_napi_id = 0; |
64b0dc51 | 2895 | sk->sk_ll_usec = sysctl_net_busy_read; |
06021292 ET |
2896 | #endif |
2897 | ||
76a9ebe8 ED |
2898 | sk->sk_max_pacing_rate = ~0UL; |
2899 | sk->sk_pacing_rate = ~0UL; | |
3a9b76fd | 2900 | sk->sk_pacing_shift = 10; |
70da268b | 2901 | sk->sk_incoming_cpu = -1; |
c6345ce7 AN |
2902 | |
2903 | sk_rx_queue_clear(sk); | |
4dc6dc71 ED |
2904 | /* |
2905 | * Before updating sk_refcnt, we must commit prior changes to memory | |
2906 | * (Documentation/RCU/rculist_nulls.txt for details) | |
2907 | */ | |
2908 | smp_wmb(); | |
41c6d650 | 2909 | refcount_set(&sk->sk_refcnt, 1); |
33c732c3 | 2910 | atomic_set(&sk->sk_drops, 0); |
1da177e4 | 2911 | } |
2a91525c | 2912 | EXPORT_SYMBOL(sock_init_data); |
1da177e4 | 2913 | |
b5606c2d | 2914 | void lock_sock_nested(struct sock *sk, int subclass) |
1da177e4 LT |
2915 | { |
2916 | might_sleep(); | |
a5b5bb9a | 2917 | spin_lock_bh(&sk->sk_lock.slock); |
d2e9117c | 2918 | if (sk->sk_lock.owned) |
1da177e4 | 2919 | __lock_sock(sk); |
d2e9117c | 2920 | sk->sk_lock.owned = 1; |
a5b5bb9a IM |
2921 | spin_unlock(&sk->sk_lock.slock); |
2922 | /* | |
2923 | * The sk_lock has mutex_lock() semantics here: | |
2924 | */ | |
fcc70d5f | 2925 | mutex_acquire(&sk->sk_lock.dep_map, subclass, 0, _RET_IP_); |
a5b5bb9a | 2926 | local_bh_enable(); |
1da177e4 | 2927 | } |
fcc70d5f | 2928 | EXPORT_SYMBOL(lock_sock_nested); |
1da177e4 | 2929 | |
b5606c2d | 2930 | void release_sock(struct sock *sk) |
1da177e4 | 2931 | { |
a5b5bb9a | 2932 | spin_lock_bh(&sk->sk_lock.slock); |
1da177e4 LT |
2933 | if (sk->sk_backlog.tail) |
2934 | __release_sock(sk); | |
46d3ceab | 2935 | |
c3f9b018 ED |
2936 | /* Warning : release_cb() might need to release sk ownership, |
2937 | * ie call sock_release_ownership(sk) before us. | |
2938 | */ | |
46d3ceab ED |
2939 | if (sk->sk_prot->release_cb) |
2940 | sk->sk_prot->release_cb(sk); | |
2941 | ||
c3f9b018 | 2942 | sock_release_ownership(sk); |
a5b5bb9a IM |
2943 | if (waitqueue_active(&sk->sk_lock.wq)) |
2944 | wake_up(&sk->sk_lock.wq); | |
2945 | spin_unlock_bh(&sk->sk_lock.slock); | |
1da177e4 LT |
2946 | } |
2947 | EXPORT_SYMBOL(release_sock); | |
2948 | ||
8a74ad60 ED |
2949 | /** |
2950 | * lock_sock_fast - fast version of lock_sock | |
2951 | * @sk: socket | |
2952 | * | |
2953 | * This version should be used for very small section, where process wont block | |
d651983d MCC |
2954 | * return false if fast path is taken: |
2955 | * | |
8a74ad60 | 2956 | * sk_lock.slock locked, owned = 0, BH disabled |
d651983d MCC |
2957 | * |
2958 | * return true if slow path is taken: | |
2959 | * | |
8a74ad60 ED |
2960 | * sk_lock.slock unlocked, owned = 1, BH enabled |
2961 | */ | |
2962 | bool lock_sock_fast(struct sock *sk) | |
2963 | { | |
2964 | might_sleep(); | |
2965 | spin_lock_bh(&sk->sk_lock.slock); | |
2966 | ||
2967 | if (!sk->sk_lock.owned) | |
2968 | /* | |
2969 | * Note : We must disable BH | |
2970 | */ | |
2971 | return false; | |
2972 | ||
2973 | __lock_sock(sk); | |
2974 | sk->sk_lock.owned = 1; | |
2975 | spin_unlock(&sk->sk_lock.slock); | |
2976 | /* | |
2977 | * The sk_lock has mutex_lock() semantics here: | |
2978 | */ | |
2979 | mutex_acquire(&sk->sk_lock.dep_map, 0, 0, _RET_IP_); | |
2980 | local_bh_enable(); | |
2981 | return true; | |
2982 | } | |
2983 | EXPORT_SYMBOL(lock_sock_fast); | |
2984 | ||
c7cbdbf2 AB |
2985 | int sock_gettstamp(struct socket *sock, void __user *userstamp, |
2986 | bool timeval, bool time32) | |
4ec93edb | 2987 | { |
c7cbdbf2 AB |
2988 | struct sock *sk = sock->sk; |
2989 | struct timespec64 ts; | |
9dae3497 YS |
2990 | |
2991 | sock_enable_timestamp(sk, SOCK_TIMESTAMP); | |
c7cbdbf2 AB |
2992 | ts = ktime_to_timespec64(sock_read_timestamp(sk)); |
2993 | if (ts.tv_sec == -1) | |
1da177e4 | 2994 | return -ENOENT; |
c7cbdbf2 | 2995 | if (ts.tv_sec == 0) { |
3a0ed3e9 | 2996 | ktime_t kt = ktime_get_real(); |
c7cbdbf2 AB |
2997 | sock_write_timestamp(sk, kt);; |
2998 | ts = ktime_to_timespec64(kt); | |
b7aa0bf7 | 2999 | } |
1da177e4 | 3000 | |
c7cbdbf2 AB |
3001 | if (timeval) |
3002 | ts.tv_nsec /= 1000; | |
9dae3497 | 3003 | |
c7cbdbf2 AB |
3004 | #ifdef CONFIG_COMPAT_32BIT_TIME |
3005 | if (time32) | |
3006 | return put_old_timespec32(&ts, userstamp); | |
3007 | #endif | |
3008 | #ifdef CONFIG_SPARC64 | |
3009 | /* beware of padding in sparc64 timeval */ | |
3010 | if (timeval && !in_compat_syscall()) { | |
3011 | struct __kernel_old_timeval __user tv = { | |
3012 | .tv_sec = ts.tv_sec; | |
3013 | .tv_usec = ts.tv_nsec; | |
3014 | }; | |
3015 | if (copy_to_user(userstamp, &tv, sizeof(tv)) | |
3016 | return -EFAULT; | |
3017 | return 0; | |
ae40eb1e | 3018 | } |
c7cbdbf2 AB |
3019 | #endif |
3020 | return put_timespec64(&ts, userstamp); | |
ae40eb1e | 3021 | } |
c7cbdbf2 | 3022 | EXPORT_SYMBOL(sock_gettstamp); |
ae40eb1e | 3023 | |
20d49473 | 3024 | void sock_enable_timestamp(struct sock *sk, int flag) |
4ec93edb | 3025 | { |
20d49473 | 3026 | if (!sock_flag(sk, flag)) { |
08e29af3 ED |
3027 | unsigned long previous_flags = sk->sk_flags; |
3028 | ||
20d49473 PO |
3029 | sock_set_flag(sk, flag); |
3030 | /* | |
3031 | * we just set one of the two flags which require net | |
3032 | * time stamping, but time stamping might have been on | |
3033 | * already because of the other one | |
3034 | */ | |
080a270f HFS |
3035 | if (sock_needs_netstamp(sk) && |
3036 | !(previous_flags & SK_FLAGS_TIMESTAMP)) | |
20d49473 | 3037 | net_enable_timestamp(); |
1da177e4 LT |
3038 | } |
3039 | } | |
1da177e4 | 3040 | |
cb820f8e RC |
3041 | int sock_recv_errqueue(struct sock *sk, struct msghdr *msg, int len, |
3042 | int level, int type) | |
3043 | { | |
3044 | struct sock_exterr_skb *serr; | |
364a9e93 | 3045 | struct sk_buff *skb; |
cb820f8e RC |
3046 | int copied, err; |
3047 | ||
3048 | err = -EAGAIN; | |
364a9e93 | 3049 | skb = sock_dequeue_err_skb(sk); |
cb820f8e RC |
3050 | if (skb == NULL) |
3051 | goto out; | |
3052 | ||
3053 | copied = skb->len; | |
3054 | if (copied > len) { | |
3055 | msg->msg_flags |= MSG_TRUNC; | |
3056 | copied = len; | |
3057 | } | |
51f3d02b | 3058 | err = skb_copy_datagram_msg(skb, 0, msg, copied); |
cb820f8e RC |
3059 | if (err) |
3060 | goto out_free_skb; | |
3061 | ||
3062 | sock_recv_timestamp(msg, sk, skb); | |
3063 | ||
3064 | serr = SKB_EXT_ERR(skb); | |
3065 | put_cmsg(msg, level, type, sizeof(serr->ee), &serr->ee); | |
3066 | ||
3067 | msg->msg_flags |= MSG_ERRQUEUE; | |
3068 | err = copied; | |
3069 | ||
cb820f8e RC |
3070 | out_free_skb: |
3071 | kfree_skb(skb); | |
3072 | out: | |
3073 | return err; | |
3074 | } | |
3075 | EXPORT_SYMBOL(sock_recv_errqueue); | |
3076 | ||
1da177e4 LT |
3077 | /* |
3078 | * Get a socket option on an socket. | |
3079 | * | |
3080 | * FIX: POSIX 1003.1g is very ambiguous here. It states that | |
3081 | * asynchronous errors should be reported by getsockopt. We assume | |
3082 | * this means if you specify SO_ERROR (otherwise whats the point of it). | |
3083 | */ | |
3084 | int sock_common_getsockopt(struct socket *sock, int level, int optname, | |
3085 | char __user *optval, int __user *optlen) | |
3086 | { | |
3087 | struct sock *sk = sock->sk; | |
3088 | ||
3089 | return sk->sk_prot->getsockopt(sk, level, optname, optval, optlen); | |
3090 | } | |
1da177e4 LT |
3091 | EXPORT_SYMBOL(sock_common_getsockopt); |
3092 | ||
3fdadf7d | 3093 | #ifdef CONFIG_COMPAT |
543d9cfe ACM |
3094 | int compat_sock_common_getsockopt(struct socket *sock, int level, int optname, |
3095 | char __user *optval, int __user *optlen) | |
3fdadf7d DM |
3096 | { |
3097 | struct sock *sk = sock->sk; | |
3098 | ||
1e51f951 | 3099 | if (sk->sk_prot->compat_getsockopt != NULL) |
543d9cfe ACM |
3100 | return sk->sk_prot->compat_getsockopt(sk, level, optname, |
3101 | optval, optlen); | |
3fdadf7d DM |
3102 | return sk->sk_prot->getsockopt(sk, level, optname, optval, optlen); |
3103 | } | |
3104 | EXPORT_SYMBOL(compat_sock_common_getsockopt); | |
3105 | #endif | |
3106 | ||
1b784140 YX |
3107 | int sock_common_recvmsg(struct socket *sock, struct msghdr *msg, size_t size, |
3108 | int flags) | |
1da177e4 LT |
3109 | { |
3110 | struct sock *sk = sock->sk; | |
3111 | int addr_len = 0; | |
3112 | int err; | |
3113 | ||
1b784140 | 3114 | err = sk->sk_prot->recvmsg(sk, msg, size, flags & MSG_DONTWAIT, |
1da177e4 LT |
3115 | flags & ~MSG_DONTWAIT, &addr_len); |
3116 | if (err >= 0) | |
3117 | msg->msg_namelen = addr_len; | |
3118 | return err; | |
3119 | } | |
1da177e4 LT |
3120 | EXPORT_SYMBOL(sock_common_recvmsg); |
3121 | ||
3122 | /* | |
3123 | * Set socket options on an inet socket. | |
3124 | */ | |
3125 | int sock_common_setsockopt(struct socket *sock, int level, int optname, | |
b7058842 | 3126 | char __user *optval, unsigned int optlen) |
1da177e4 LT |
3127 | { |
3128 | struct sock *sk = sock->sk; | |
3129 | ||
3130 | return sk->sk_prot->setsockopt(sk, level, optname, optval, optlen); | |
3131 | } | |
1da177e4 LT |
3132 | EXPORT_SYMBOL(sock_common_setsockopt); |
3133 | ||
3fdadf7d | 3134 | #ifdef CONFIG_COMPAT |
543d9cfe | 3135 | int compat_sock_common_setsockopt(struct socket *sock, int level, int optname, |
b7058842 | 3136 | char __user *optval, unsigned int optlen) |
3fdadf7d DM |
3137 | { |
3138 | struct sock *sk = sock->sk; | |
3139 | ||
543d9cfe ACM |
3140 | if (sk->sk_prot->compat_setsockopt != NULL) |
3141 | return sk->sk_prot->compat_setsockopt(sk, level, optname, | |
3142 | optval, optlen); | |
3fdadf7d DM |
3143 | return sk->sk_prot->setsockopt(sk, level, optname, optval, optlen); |
3144 | } | |
3145 | EXPORT_SYMBOL(compat_sock_common_setsockopt); | |
3146 | #endif | |
3147 | ||
1da177e4 LT |
3148 | void sk_common_release(struct sock *sk) |
3149 | { | |
3150 | if (sk->sk_prot->destroy) | |
3151 | sk->sk_prot->destroy(sk); | |
3152 | ||
3153 | /* | |
3154 | * Observation: when sock_common_release is called, processes have | |
3155 | * no access to socket. But net still has. | |
3156 | * Step one, detach it from networking: | |
3157 | * | |
3158 | * A. Remove from hash tables. | |
3159 | */ | |
3160 | ||
3161 | sk->sk_prot->unhash(sk); | |
3162 | ||
3163 | /* | |
3164 | * In this point socket cannot receive new packets, but it is possible | |
3165 | * that some packets are in flight because some CPU runs receiver and | |
3166 | * did hash table lookup before we unhashed socket. They will achieve | |
3167 | * receive queue and will be purged by socket destructor. | |
3168 | * | |
3169 | * Also we still have packets pending on receive queue and probably, | |
3170 | * our own packets waiting in device queues. sock_destroy will drain | |
3171 | * receive queue, but transmitted packets will delay socket destruction | |
3172 | * until the last reference will be released. | |
3173 | */ | |
3174 | ||
3175 | sock_orphan(sk); | |
3176 | ||
3177 | xfrm_sk_free_policy(sk); | |
3178 | ||
e6848976 | 3179 | sk_refcnt_debug_release(sk); |
5640f768 | 3180 | |
1da177e4 LT |
3181 | sock_put(sk); |
3182 | } | |
1da177e4 LT |
3183 | EXPORT_SYMBOL(sk_common_release); |
3184 | ||
a2d133b1 JH |
3185 | void sk_get_meminfo(const struct sock *sk, u32 *mem) |
3186 | { | |
3187 | memset(mem, 0, sizeof(*mem) * SK_MEMINFO_VARS); | |
3188 | ||
3189 | mem[SK_MEMINFO_RMEM_ALLOC] = sk_rmem_alloc_get(sk); | |
3190 | mem[SK_MEMINFO_RCVBUF] = sk->sk_rcvbuf; | |
3191 | mem[SK_MEMINFO_WMEM_ALLOC] = sk_wmem_alloc_get(sk); | |
3192 | mem[SK_MEMINFO_SNDBUF] = sk->sk_sndbuf; | |
3193 | mem[SK_MEMINFO_FWD_ALLOC] = sk->sk_forward_alloc; | |
3194 | mem[SK_MEMINFO_WMEM_QUEUED] = sk->sk_wmem_queued; | |
3195 | mem[SK_MEMINFO_OPTMEM] = atomic_read(&sk->sk_omem_alloc); | |
3196 | mem[SK_MEMINFO_BACKLOG] = sk->sk_backlog.len; | |
3197 | mem[SK_MEMINFO_DROPS] = atomic_read(&sk->sk_drops); | |
3198 | } | |
3199 | ||
13ff3d6f PE |
3200 | #ifdef CONFIG_PROC_FS |
3201 | #define PROTO_INUSE_NR 64 /* should be enough for the first time */ | |
1338d466 PE |
3202 | struct prot_inuse { |
3203 | int val[PROTO_INUSE_NR]; | |
3204 | }; | |
13ff3d6f PE |
3205 | |
3206 | static DECLARE_BITMAP(proto_inuse_idx, PROTO_INUSE_NR); | |
70ee1159 | 3207 | |
70ee1159 PE |
3208 | void sock_prot_inuse_add(struct net *net, struct proto *prot, int val) |
3209 | { | |
08fc7f81 | 3210 | __this_cpu_add(net->core.prot_inuse->val[prot->inuse_idx], val); |
70ee1159 PE |
3211 | } |
3212 | EXPORT_SYMBOL_GPL(sock_prot_inuse_add); | |
3213 | ||
3214 | int sock_prot_inuse_get(struct net *net, struct proto *prot) | |
3215 | { | |
3216 | int cpu, idx = prot->inuse_idx; | |
3217 | int res = 0; | |
3218 | ||
3219 | for_each_possible_cpu(cpu) | |
08fc7f81 | 3220 | res += per_cpu_ptr(net->core.prot_inuse, cpu)->val[idx]; |
70ee1159 PE |
3221 | |
3222 | return res >= 0 ? res : 0; | |
3223 | } | |
3224 | EXPORT_SYMBOL_GPL(sock_prot_inuse_get); | |
3225 | ||
648845ab TZ |
3226 | static void sock_inuse_add(struct net *net, int val) |
3227 | { | |
3228 | this_cpu_add(*net->core.sock_inuse, val); | |
3229 | } | |
3230 | ||
3231 | int sock_inuse_get(struct net *net) | |
3232 | { | |
3233 | int cpu, res = 0; | |
3234 | ||
3235 | for_each_possible_cpu(cpu) | |
3236 | res += *per_cpu_ptr(net->core.sock_inuse, cpu); | |
3237 | ||
3238 | return res; | |
3239 | } | |
3240 | ||
3241 | EXPORT_SYMBOL_GPL(sock_inuse_get); | |
3242 | ||
2c8c1e72 | 3243 | static int __net_init sock_inuse_init_net(struct net *net) |
70ee1159 | 3244 | { |
08fc7f81 | 3245 | net->core.prot_inuse = alloc_percpu(struct prot_inuse); |
648845ab TZ |
3246 | if (net->core.prot_inuse == NULL) |
3247 | return -ENOMEM; | |
3248 | ||
3249 | net->core.sock_inuse = alloc_percpu(int); | |
3250 | if (net->core.sock_inuse == NULL) | |
3251 | goto out; | |
3252 | ||
3253 | return 0; | |
3254 | ||
3255 | out: | |
3256 | free_percpu(net->core.prot_inuse); | |
3257 | return -ENOMEM; | |
70ee1159 PE |
3258 | } |
3259 | ||
2c8c1e72 | 3260 | static void __net_exit sock_inuse_exit_net(struct net *net) |
70ee1159 | 3261 | { |
08fc7f81 | 3262 | free_percpu(net->core.prot_inuse); |
648845ab | 3263 | free_percpu(net->core.sock_inuse); |
70ee1159 PE |
3264 | } |
3265 | ||
3266 | static struct pernet_operations net_inuse_ops = { | |
3267 | .init = sock_inuse_init_net, | |
3268 | .exit = sock_inuse_exit_net, | |
3269 | }; | |
3270 | ||
3271 | static __init int net_inuse_init(void) | |
3272 | { | |
3273 | if (register_pernet_subsys(&net_inuse_ops)) | |
3274 | panic("Cannot initialize net inuse counters"); | |
3275 | ||
3276 | return 0; | |
3277 | } | |
3278 | ||
3279 | core_initcall(net_inuse_init); | |
13ff3d6f PE |
3280 | |
3281 | static void assign_proto_idx(struct proto *prot) | |
3282 | { | |
3283 | prot->inuse_idx = find_first_zero_bit(proto_inuse_idx, PROTO_INUSE_NR); | |
3284 | ||
3285 | if (unlikely(prot->inuse_idx == PROTO_INUSE_NR - 1)) { | |
e005d193 | 3286 | pr_err("PROTO_INUSE_NR exhausted\n"); |
13ff3d6f PE |
3287 | return; |
3288 | } | |
3289 | ||
3290 | set_bit(prot->inuse_idx, proto_inuse_idx); | |
3291 | } | |
3292 | ||
3293 | static void release_proto_idx(struct proto *prot) | |
3294 | { | |
3295 | if (prot->inuse_idx != PROTO_INUSE_NR - 1) | |
3296 | clear_bit(prot->inuse_idx, proto_inuse_idx); | |
3297 | } | |
3298 | #else | |
3299 | static inline void assign_proto_idx(struct proto *prot) | |
3300 | { | |
3301 | } | |
3302 | ||
3303 | static inline void release_proto_idx(struct proto *prot) | |
3304 | { | |
3305 | } | |
648845ab TZ |
3306 | |
3307 | static void sock_inuse_add(struct net *net, int val) | |
3308 | { | |
3309 | } | |
13ff3d6f PE |
3310 | #endif |
3311 | ||
0159dfd3 ED |
3312 | static void req_prot_cleanup(struct request_sock_ops *rsk_prot) |
3313 | { | |
3314 | if (!rsk_prot) | |
3315 | return; | |
3316 | kfree(rsk_prot->slab_name); | |
3317 | rsk_prot->slab_name = NULL; | |
adf78eda JL |
3318 | kmem_cache_destroy(rsk_prot->slab); |
3319 | rsk_prot->slab = NULL; | |
0159dfd3 ED |
3320 | } |
3321 | ||
3322 | static int req_prot_init(const struct proto *prot) | |
3323 | { | |
3324 | struct request_sock_ops *rsk_prot = prot->rsk_prot; | |
3325 | ||
3326 | if (!rsk_prot) | |
3327 | return 0; | |
3328 | ||
3329 | rsk_prot->slab_name = kasprintf(GFP_KERNEL, "request_sock_%s", | |
3330 | prot->name); | |
3331 | if (!rsk_prot->slab_name) | |
3332 | return -ENOMEM; | |
3333 | ||
3334 | rsk_prot->slab = kmem_cache_create(rsk_prot->slab_name, | |
3335 | rsk_prot->obj_size, 0, | |
e699e2c6 SB |
3336 | SLAB_ACCOUNT | prot->slab_flags, |
3337 | NULL); | |
0159dfd3 ED |
3338 | |
3339 | if (!rsk_prot->slab) { | |
3340 | pr_crit("%s: Can't create request sock SLAB cache!\n", | |
3341 | prot->name); | |
3342 | return -ENOMEM; | |
3343 | } | |
3344 | return 0; | |
3345 | } | |
3346 | ||
b733c007 PE |
3347 | int proto_register(struct proto *prot, int alloc_slab) |
3348 | { | |
1da177e4 | 3349 | if (alloc_slab) { |
30c2c9f1 DW |
3350 | prot->slab = kmem_cache_create_usercopy(prot->name, |
3351 | prot->obj_size, 0, | |
e699e2c6 SB |
3352 | SLAB_HWCACHE_ALIGN | SLAB_ACCOUNT | |
3353 | prot->slab_flags, | |
289a4860 | 3354 | prot->useroffset, prot->usersize, |
271b72c7 | 3355 | NULL); |
1da177e4 LT |
3356 | |
3357 | if (prot->slab == NULL) { | |
e005d193 JP |
3358 | pr_crit("%s: Can't create sock SLAB cache!\n", |
3359 | prot->name); | |
60e7663d | 3360 | goto out; |
1da177e4 | 3361 | } |
2e6599cb | 3362 | |
0159dfd3 ED |
3363 | if (req_prot_init(prot)) |
3364 | goto out_free_request_sock_slab; | |
8feaf0c0 | 3365 | |
6d6ee43e | 3366 | if (prot->twsk_prot != NULL) { |
faf23422 | 3367 | prot->twsk_prot->twsk_slab_name = kasprintf(GFP_KERNEL, "tw_sock_%s", prot->name); |
8feaf0c0 | 3368 | |
7e56b5d6 | 3369 | if (prot->twsk_prot->twsk_slab_name == NULL) |
8feaf0c0 ACM |
3370 | goto out_free_request_sock_slab; |
3371 | ||
6d6ee43e | 3372 | prot->twsk_prot->twsk_slab = |
7e56b5d6 | 3373 | kmem_cache_create(prot->twsk_prot->twsk_slab_name, |
6d6ee43e | 3374 | prot->twsk_prot->twsk_obj_size, |
3ab5aee7 | 3375 | 0, |
e699e2c6 | 3376 | SLAB_ACCOUNT | |
52db70dc | 3377 | prot->slab_flags, |
20c2df83 | 3378 | NULL); |
6d6ee43e | 3379 | if (prot->twsk_prot->twsk_slab == NULL) |
8feaf0c0 ACM |
3380 | goto out_free_timewait_sock_slab_name; |
3381 | } | |
1da177e4 LT |
3382 | } |
3383 | ||
36b77a52 | 3384 | mutex_lock(&proto_list_mutex); |
1da177e4 | 3385 | list_add(&prot->node, &proto_list); |
13ff3d6f | 3386 | assign_proto_idx(prot); |
36b77a52 | 3387 | mutex_unlock(&proto_list_mutex); |
b733c007 PE |
3388 | return 0; |
3389 | ||
8feaf0c0 | 3390 | out_free_timewait_sock_slab_name: |
7e56b5d6 | 3391 | kfree(prot->twsk_prot->twsk_slab_name); |
8feaf0c0 | 3392 | out_free_request_sock_slab: |
0159dfd3 ED |
3393 | req_prot_cleanup(prot->rsk_prot); |
3394 | ||
2e6599cb ACM |
3395 | kmem_cache_destroy(prot->slab); |
3396 | prot->slab = NULL; | |
b733c007 PE |
3397 | out: |
3398 | return -ENOBUFS; | |
1da177e4 | 3399 | } |
1da177e4 LT |
3400 | EXPORT_SYMBOL(proto_register); |
3401 | ||
3402 | void proto_unregister(struct proto *prot) | |
3403 | { | |
36b77a52 | 3404 | mutex_lock(&proto_list_mutex); |
13ff3d6f | 3405 | release_proto_idx(prot); |
0a3f4358 | 3406 | list_del(&prot->node); |
36b77a52 | 3407 | mutex_unlock(&proto_list_mutex); |
1da177e4 | 3408 | |
adf78eda JL |
3409 | kmem_cache_destroy(prot->slab); |
3410 | prot->slab = NULL; | |
1da177e4 | 3411 | |
0159dfd3 | 3412 | req_prot_cleanup(prot->rsk_prot); |
2e6599cb | 3413 | |
6d6ee43e | 3414 | if (prot->twsk_prot != NULL && prot->twsk_prot->twsk_slab != NULL) { |
6d6ee43e | 3415 | kmem_cache_destroy(prot->twsk_prot->twsk_slab); |
7e56b5d6 | 3416 | kfree(prot->twsk_prot->twsk_slab_name); |
6d6ee43e | 3417 | prot->twsk_prot->twsk_slab = NULL; |
8feaf0c0 | 3418 | } |
1da177e4 | 3419 | } |
1da177e4 LT |
3420 | EXPORT_SYMBOL(proto_unregister); |
3421 | ||
bf2ae2e4 XL |
3422 | int sock_load_diag_module(int family, int protocol) |
3423 | { | |
3424 | if (!protocol) { | |
3425 | if (!sock_is_registered(family)) | |
3426 | return -ENOENT; | |
3427 | ||
3428 | return request_module("net-pf-%d-proto-%d-type-%d", PF_NETLINK, | |
3429 | NETLINK_SOCK_DIAG, family); | |
3430 | } | |
3431 | ||
3432 | #ifdef CONFIG_INET | |
3433 | if (family == AF_INET && | |
c34c1287 | 3434 | protocol != IPPROTO_RAW && |
bf2ae2e4 XL |
3435 | !rcu_access_pointer(inet_protos[protocol])) |
3436 | return -ENOENT; | |
3437 | #endif | |
3438 | ||
3439 | return request_module("net-pf-%d-proto-%d-type-%d-%d", PF_NETLINK, | |
3440 | NETLINK_SOCK_DIAG, family, protocol); | |
3441 | } | |
3442 | EXPORT_SYMBOL(sock_load_diag_module); | |
3443 | ||
1da177e4 | 3444 | #ifdef CONFIG_PROC_FS |
1da177e4 | 3445 | static void *proto_seq_start(struct seq_file *seq, loff_t *pos) |
36b77a52 | 3446 | __acquires(proto_list_mutex) |
1da177e4 | 3447 | { |
36b77a52 | 3448 | mutex_lock(&proto_list_mutex); |
60f0438a | 3449 | return seq_list_start_head(&proto_list, *pos); |
1da177e4 LT |
3450 | } |
3451 | ||
3452 | static void *proto_seq_next(struct seq_file *seq, void *v, loff_t *pos) | |
3453 | { | |
60f0438a | 3454 | return seq_list_next(v, &proto_list, pos); |
1da177e4 LT |
3455 | } |
3456 | ||
3457 | static void proto_seq_stop(struct seq_file *seq, void *v) | |
36b77a52 | 3458 | __releases(proto_list_mutex) |
1da177e4 | 3459 | { |
36b77a52 | 3460 | mutex_unlock(&proto_list_mutex); |
1da177e4 LT |
3461 | } |
3462 | ||
3463 | static char proto_method_implemented(const void *method) | |
3464 | { | |
3465 | return method == NULL ? 'n' : 'y'; | |
3466 | } | |
180d8cd9 GC |
3467 | static long sock_prot_memory_allocated(struct proto *proto) |
3468 | { | |
cb75a36c | 3469 | return proto->memory_allocated != NULL ? proto_memory_allocated(proto) : -1L; |
180d8cd9 GC |
3470 | } |
3471 | ||
3472 | static char *sock_prot_memory_pressure(struct proto *proto) | |
3473 | { | |
3474 | return proto->memory_pressure != NULL ? | |
3475 | proto_memory_pressure(proto) ? "yes" : "no" : "NI"; | |
3476 | } | |
1da177e4 LT |
3477 | |
3478 | static void proto_seq_printf(struct seq_file *seq, struct proto *proto) | |
3479 | { | |
180d8cd9 | 3480 | |
8d987e5c | 3481 | seq_printf(seq, "%-9s %4u %6d %6ld %-3s %6u %-3s %-10s " |
1da177e4 LT |
3482 | "%2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c\n", |
3483 | proto->name, | |
3484 | proto->obj_size, | |
14e943db | 3485 | sock_prot_inuse_get(seq_file_net(seq), proto), |
180d8cd9 GC |
3486 | sock_prot_memory_allocated(proto), |
3487 | sock_prot_memory_pressure(proto), | |
1da177e4 LT |
3488 | proto->max_header, |
3489 | proto->slab == NULL ? "no" : "yes", | |
3490 | module_name(proto->owner), | |
3491 | proto_method_implemented(proto->close), | |
3492 | proto_method_implemented(proto->connect), | |
3493 | proto_method_implemented(proto->disconnect), | |
3494 | proto_method_implemented(proto->accept), | |
3495 | proto_method_implemented(proto->ioctl), | |
3496 | proto_method_implemented(proto->init), | |
3497 | proto_method_implemented(proto->destroy), | |
3498 | proto_method_implemented(proto->shutdown), | |
3499 | proto_method_implemented(proto->setsockopt), | |
3500 | proto_method_implemented(proto->getsockopt), | |
3501 | proto_method_implemented(proto->sendmsg), | |
3502 | proto_method_implemented(proto->recvmsg), | |
3503 | proto_method_implemented(proto->sendpage), | |
3504 | proto_method_implemented(proto->bind), | |
3505 | proto_method_implemented(proto->backlog_rcv), | |
3506 | proto_method_implemented(proto->hash), | |
3507 | proto_method_implemented(proto->unhash), | |
3508 | proto_method_implemented(proto->get_port), | |
3509 | proto_method_implemented(proto->enter_memory_pressure)); | |
3510 | } | |
3511 | ||
3512 | static int proto_seq_show(struct seq_file *seq, void *v) | |
3513 | { | |
60f0438a | 3514 | if (v == &proto_list) |
1da177e4 LT |
3515 | seq_printf(seq, "%-9s %-4s %-8s %-6s %-5s %-7s %-4s %-10s %s", |
3516 | "protocol", | |
3517 | "size", | |
3518 | "sockets", | |
3519 | "memory", | |
3520 | "press", | |
3521 | "maxhdr", | |
3522 | "slab", | |
3523 | "module", | |
3524 | "cl co di ac io in de sh ss gs se re sp bi br ha uh gp em\n"); | |
3525 | else | |
60f0438a | 3526 | proto_seq_printf(seq, list_entry(v, struct proto, node)); |
1da177e4 LT |
3527 | return 0; |
3528 | } | |
3529 | ||
f690808e | 3530 | static const struct seq_operations proto_seq_ops = { |
1da177e4 LT |
3531 | .start = proto_seq_start, |
3532 | .next = proto_seq_next, | |
3533 | .stop = proto_seq_stop, | |
3534 | .show = proto_seq_show, | |
3535 | }; | |
3536 | ||
14e943db ED |
3537 | static __net_init int proto_init_net(struct net *net) |
3538 | { | |
c3506372 CH |
3539 | if (!proc_create_net("protocols", 0444, net->proc_net, &proto_seq_ops, |
3540 | sizeof(struct seq_net_private))) | |
14e943db ED |
3541 | return -ENOMEM; |
3542 | ||
3543 | return 0; | |
3544 | } | |
3545 | ||
3546 | static __net_exit void proto_exit_net(struct net *net) | |
3547 | { | |
ece31ffd | 3548 | remove_proc_entry("protocols", net->proc_net); |
14e943db ED |
3549 | } |
3550 | ||
3551 | ||
3552 | static __net_initdata struct pernet_operations proto_net_ops = { | |
3553 | .init = proto_init_net, | |
3554 | .exit = proto_exit_net, | |
1da177e4 LT |
3555 | }; |
3556 | ||
3557 | static int __init proto_init(void) | |
3558 | { | |
14e943db | 3559 | return register_pernet_subsys(&proto_net_ops); |
1da177e4 LT |
3560 | } |
3561 | ||
3562 | subsys_initcall(proto_init); | |
3563 | ||
3564 | #endif /* PROC_FS */ | |
7db6b048 SS |
3565 | |
3566 | #ifdef CONFIG_NET_RX_BUSY_POLL | |
3567 | bool sk_busy_loop_end(void *p, unsigned long start_time) | |
3568 | { | |
3569 | struct sock *sk = p; | |
3570 | ||
3571 | return !skb_queue_empty(&sk->sk_receive_queue) || | |
3572 | sk_busy_loop_timeout(sk, start_time); | |
3573 | } | |
3574 | EXPORT_SYMBOL(sk_busy_loop_end); | |
3575 | #endif /* CONFIG_NET_RX_BUSY_POLL */ |