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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> |
1da177e4 | 140 | |
3847ce32 SM |
141 | #include <trace/events/sock.h> |
142 | ||
1da177e4 | 143 | #include <net/tcp.h> |
076bb0c8 | 144 | #include <net/busy_poll.h> |
06021292 | 145 | |
36b77a52 | 146 | static DEFINE_MUTEX(proto_list_mutex); |
d1a4c0b3 GC |
147 | static LIST_HEAD(proto_list); |
148 | ||
648845ab TZ |
149 | static void sock_inuse_add(struct net *net, int val); |
150 | ||
a3b299da EB |
151 | /** |
152 | * sk_ns_capable - General socket capability test | |
153 | * @sk: Socket to use a capability on or through | |
154 | * @user_ns: The user namespace of the capability to use | |
155 | * @cap: The capability to use | |
156 | * | |
157 | * Test to see if the opener of the socket had when the socket was | |
158 | * created and the current process has the capability @cap in the user | |
159 | * namespace @user_ns. | |
160 | */ | |
161 | bool sk_ns_capable(const struct sock *sk, | |
162 | struct user_namespace *user_ns, int cap) | |
163 | { | |
164 | return file_ns_capable(sk->sk_socket->file, user_ns, cap) && | |
165 | ns_capable(user_ns, cap); | |
166 | } | |
167 | EXPORT_SYMBOL(sk_ns_capable); | |
168 | ||
169 | /** | |
170 | * sk_capable - Socket global capability test | |
171 | * @sk: Socket to use a capability on or through | |
e793c0f7 | 172 | * @cap: The global capability to use |
a3b299da EB |
173 | * |
174 | * Test to see if the opener of the socket had when the socket was | |
175 | * created and the current process has the capability @cap in all user | |
176 | * namespaces. | |
177 | */ | |
178 | bool sk_capable(const struct sock *sk, int cap) | |
179 | { | |
180 | return sk_ns_capable(sk, &init_user_ns, cap); | |
181 | } | |
182 | EXPORT_SYMBOL(sk_capable); | |
183 | ||
184 | /** | |
185 | * sk_net_capable - Network namespace socket capability test | |
186 | * @sk: Socket to use a capability on or through | |
187 | * @cap: The capability to use | |
188 | * | |
e793c0f7 | 189 | * Test to see if the opener of the socket had when the socket was created |
a3b299da EB |
190 | * and the current process has the capability @cap over the network namespace |
191 | * the socket is a member of. | |
192 | */ | |
193 | bool sk_net_capable(const struct sock *sk, int cap) | |
194 | { | |
195 | return sk_ns_capable(sk, sock_net(sk)->user_ns, cap); | |
196 | } | |
197 | EXPORT_SYMBOL(sk_net_capable); | |
198 | ||
da21f24d IM |
199 | /* |
200 | * Each address family might have different locking rules, so we have | |
cdfbabfb DH |
201 | * one slock key per address family and separate keys for internal and |
202 | * userspace sockets. | |
da21f24d | 203 | */ |
a5b5bb9a | 204 | static struct lock_class_key af_family_keys[AF_MAX]; |
cdfbabfb | 205 | static struct lock_class_key af_family_kern_keys[AF_MAX]; |
a5b5bb9a | 206 | static struct lock_class_key af_family_slock_keys[AF_MAX]; |
cdfbabfb | 207 | static struct lock_class_key af_family_kern_slock_keys[AF_MAX]; |
a5b5bb9a | 208 | |
a5b5bb9a IM |
209 | /* |
210 | * Make lock validator output more readable. (we pre-construct these | |
211 | * strings build-time, so that runtime initialization of socket | |
212 | * locks is fast): | |
213 | */ | |
cdfbabfb DH |
214 | |
215 | #define _sock_locks(x) \ | |
216 | x "AF_UNSPEC", x "AF_UNIX" , x "AF_INET" , \ | |
217 | x "AF_AX25" , x "AF_IPX" , x "AF_APPLETALK", \ | |
218 | x "AF_NETROM", x "AF_BRIDGE" , x "AF_ATMPVC" , \ | |
219 | x "AF_X25" , x "AF_INET6" , x "AF_ROSE" , \ | |
220 | x "AF_DECnet", x "AF_NETBEUI" , x "AF_SECURITY" , \ | |
221 | x "AF_KEY" , x "AF_NETLINK" , x "AF_PACKET" , \ | |
222 | x "AF_ASH" , x "AF_ECONET" , x "AF_ATMSVC" , \ | |
223 | x "AF_RDS" , x "AF_SNA" , x "AF_IRDA" , \ | |
224 | x "AF_PPPOX" , x "AF_WANPIPE" , x "AF_LLC" , \ | |
225 | x "27" , x "28" , x "AF_CAN" , \ | |
226 | x "AF_TIPC" , x "AF_BLUETOOTH", x "IUCV" , \ | |
227 | x "AF_RXRPC" , x "AF_ISDN" , x "AF_PHONET" , \ | |
228 | x "AF_IEEE802154", x "AF_CAIF" , x "AF_ALG" , \ | |
229 | x "AF_NFC" , x "AF_VSOCK" , x "AF_KCM" , \ | |
68e8b849 BT |
230 | x "AF_QIPCRTR", x "AF_SMC" , x "AF_XDP" , \ |
231 | x "AF_MAX" | |
cdfbabfb | 232 | |
36cbd3dc | 233 | static const char *const af_family_key_strings[AF_MAX+1] = { |
cdfbabfb | 234 | _sock_locks("sk_lock-") |
a5b5bb9a | 235 | }; |
36cbd3dc | 236 | static const char *const af_family_slock_key_strings[AF_MAX+1] = { |
cdfbabfb | 237 | _sock_locks("slock-") |
a5b5bb9a | 238 | }; |
36cbd3dc | 239 | static const char *const af_family_clock_key_strings[AF_MAX+1] = { |
cdfbabfb DH |
240 | _sock_locks("clock-") |
241 | }; | |
242 | ||
243 | static const char *const af_family_kern_key_strings[AF_MAX+1] = { | |
244 | _sock_locks("k-sk_lock-") | |
245 | }; | |
246 | static const char *const af_family_kern_slock_key_strings[AF_MAX+1] = { | |
247 | _sock_locks("k-slock-") | |
248 | }; | |
249 | static const char *const af_family_kern_clock_key_strings[AF_MAX+1] = { | |
250 | _sock_locks("k-clock-") | |
443aef0e | 251 | }; |
581319c5 | 252 | static const char *const af_family_rlock_key_strings[AF_MAX+1] = { |
6b431d50 | 253 | _sock_locks("rlock-") |
581319c5 PA |
254 | }; |
255 | static const char *const af_family_wlock_key_strings[AF_MAX+1] = { | |
6b431d50 | 256 | _sock_locks("wlock-") |
581319c5 PA |
257 | }; |
258 | static const char *const af_family_elock_key_strings[AF_MAX+1] = { | |
6b431d50 | 259 | _sock_locks("elock-") |
581319c5 | 260 | }; |
da21f24d IM |
261 | |
262 | /* | |
581319c5 | 263 | * sk_callback_lock and sk queues locking rules are per-address-family, |
da21f24d IM |
264 | * so split the lock classes by using a per-AF key: |
265 | */ | |
266 | static struct lock_class_key af_callback_keys[AF_MAX]; | |
581319c5 PA |
267 | static struct lock_class_key af_rlock_keys[AF_MAX]; |
268 | static struct lock_class_key af_wlock_keys[AF_MAX]; | |
269 | static struct lock_class_key af_elock_keys[AF_MAX]; | |
cdfbabfb | 270 | static struct lock_class_key af_kern_callback_keys[AF_MAX]; |
da21f24d | 271 | |
1da177e4 | 272 | /* Run time adjustable parameters. */ |
ab32ea5d | 273 | __u32 sysctl_wmem_max __read_mostly = SK_WMEM_MAX; |
6d8ebc8a | 274 | EXPORT_SYMBOL(sysctl_wmem_max); |
ab32ea5d | 275 | __u32 sysctl_rmem_max __read_mostly = SK_RMEM_MAX; |
6d8ebc8a | 276 | EXPORT_SYMBOL(sysctl_rmem_max); |
ab32ea5d BH |
277 | __u32 sysctl_wmem_default __read_mostly = SK_WMEM_MAX; |
278 | __u32 sysctl_rmem_default __read_mostly = SK_RMEM_MAX; | |
1da177e4 | 279 | |
25985edc | 280 | /* Maximal space eaten by iovec or ancillary data plus some space */ |
ab32ea5d | 281 | int sysctl_optmem_max __read_mostly = sizeof(unsigned long)*(2*UIO_MAXIOV+512); |
2a91525c | 282 | EXPORT_SYMBOL(sysctl_optmem_max); |
1da177e4 | 283 | |
b245be1f WB |
284 | int sysctl_tstamp_allow_data __read_mostly = 1; |
285 | ||
a7950ae8 DB |
286 | DEFINE_STATIC_KEY_FALSE(memalloc_socks_key); |
287 | EXPORT_SYMBOL_GPL(memalloc_socks_key); | |
c93bdd0e | 288 | |
7cb02404 MG |
289 | /** |
290 | * sk_set_memalloc - sets %SOCK_MEMALLOC | |
291 | * @sk: socket to set it on | |
292 | * | |
293 | * Set %SOCK_MEMALLOC on a socket for access to emergency reserves. | |
294 | * It's the responsibility of the admin to adjust min_free_kbytes | |
295 | * to meet the requirements | |
296 | */ | |
297 | void sk_set_memalloc(struct sock *sk) | |
298 | { | |
299 | sock_set_flag(sk, SOCK_MEMALLOC); | |
300 | sk->sk_allocation |= __GFP_MEMALLOC; | |
a7950ae8 | 301 | static_branch_inc(&memalloc_socks_key); |
7cb02404 MG |
302 | } |
303 | EXPORT_SYMBOL_GPL(sk_set_memalloc); | |
304 | ||
305 | void sk_clear_memalloc(struct sock *sk) | |
306 | { | |
307 | sock_reset_flag(sk, SOCK_MEMALLOC); | |
308 | sk->sk_allocation &= ~__GFP_MEMALLOC; | |
a7950ae8 | 309 | static_branch_dec(&memalloc_socks_key); |
c76562b6 MG |
310 | |
311 | /* | |
312 | * SOCK_MEMALLOC is allowed to ignore rmem limits to ensure forward | |
5d753610 MG |
313 | * progress of swapping. SOCK_MEMALLOC may be cleared while |
314 | * it has rmem allocations due to the last swapfile being deactivated | |
315 | * but there is a risk that the socket is unusable due to exceeding | |
316 | * the rmem limits. Reclaim the reserves and obey rmem limits again. | |
c76562b6 | 317 | */ |
5d753610 | 318 | sk_mem_reclaim(sk); |
7cb02404 MG |
319 | } |
320 | EXPORT_SYMBOL_GPL(sk_clear_memalloc); | |
321 | ||
b4b9e355 MG |
322 | int __sk_backlog_rcv(struct sock *sk, struct sk_buff *skb) |
323 | { | |
324 | int ret; | |
f1083048 | 325 | unsigned int noreclaim_flag; |
b4b9e355 MG |
326 | |
327 | /* these should have been dropped before queueing */ | |
328 | BUG_ON(!sock_flag(sk, SOCK_MEMALLOC)); | |
329 | ||
f1083048 | 330 | noreclaim_flag = memalloc_noreclaim_save(); |
b4b9e355 | 331 | ret = sk->sk_backlog_rcv(sk, skb); |
f1083048 | 332 | memalloc_noreclaim_restore(noreclaim_flag); |
b4b9e355 MG |
333 | |
334 | return ret; | |
335 | } | |
336 | EXPORT_SYMBOL(__sk_backlog_rcv); | |
337 | ||
1da177e4 LT |
338 | static int sock_set_timeout(long *timeo_p, char __user *optval, int optlen) |
339 | { | |
340 | struct timeval tv; | |
341 | ||
342 | if (optlen < sizeof(tv)) | |
343 | return -EINVAL; | |
344 | if (copy_from_user(&tv, optval, sizeof(tv))) | |
345 | return -EFAULT; | |
ba78073e VA |
346 | if (tv.tv_usec < 0 || tv.tv_usec >= USEC_PER_SEC) |
347 | return -EDOM; | |
1da177e4 | 348 | |
ba78073e | 349 | if (tv.tv_sec < 0) { |
6f11df83 AM |
350 | static int warned __read_mostly; |
351 | ||
ba78073e | 352 | *timeo_p = 0; |
50aab54f | 353 | if (warned < 10 && net_ratelimit()) { |
ba78073e | 354 | warned++; |
e005d193 JP |
355 | pr_info("%s: `%s' (pid %d) tries to set negative timeout\n", |
356 | __func__, current->comm, task_pid_nr(current)); | |
50aab54f | 357 | } |
ba78073e VA |
358 | return 0; |
359 | } | |
1da177e4 LT |
360 | *timeo_p = MAX_SCHEDULE_TIMEOUT; |
361 | if (tv.tv_sec == 0 && tv.tv_usec == 0) | |
362 | return 0; | |
363 | if (tv.tv_sec < (MAX_SCHEDULE_TIMEOUT/HZ - 1)) | |
8ccde4c5 | 364 | *timeo_p = tv.tv_sec * HZ + DIV_ROUND_UP(tv.tv_usec, USEC_PER_SEC / HZ); |
1da177e4 LT |
365 | return 0; |
366 | } | |
367 | ||
368 | static void sock_warn_obsolete_bsdism(const char *name) | |
369 | { | |
370 | static int warned; | |
371 | static char warncomm[TASK_COMM_LEN]; | |
4ec93edb YH |
372 | if (strcmp(warncomm, current->comm) && warned < 5) { |
373 | strcpy(warncomm, current->comm); | |
e005d193 JP |
374 | pr_warn("process `%s' is using obsolete %s SO_BSDCOMPAT\n", |
375 | warncomm, name); | |
1da177e4 LT |
376 | warned++; |
377 | } | |
378 | } | |
379 | ||
080a270f HFS |
380 | static bool sock_needs_netstamp(const struct sock *sk) |
381 | { | |
382 | switch (sk->sk_family) { | |
383 | case AF_UNSPEC: | |
384 | case AF_UNIX: | |
385 | return false; | |
386 | default: | |
387 | return true; | |
388 | } | |
389 | } | |
390 | ||
08e29af3 | 391 | static void sock_disable_timestamp(struct sock *sk, unsigned long flags) |
4ec93edb | 392 | { |
08e29af3 ED |
393 | if (sk->sk_flags & flags) { |
394 | sk->sk_flags &= ~flags; | |
080a270f HFS |
395 | if (sock_needs_netstamp(sk) && |
396 | !(sk->sk_flags & SK_FLAGS_TIMESTAMP)) | |
20d49473 | 397 | net_disable_timestamp(); |
1da177e4 LT |
398 | } |
399 | } | |
400 | ||
401 | ||
e6afc8ac | 402 | int __sock_queue_rcv_skb(struct sock *sk, struct sk_buff *skb) |
f0088a50 | 403 | { |
3b885787 NH |
404 | unsigned long flags; |
405 | struct sk_buff_head *list = &sk->sk_receive_queue; | |
f0088a50 | 406 | |
0fd7bac6 | 407 | if (atomic_read(&sk->sk_rmem_alloc) >= sk->sk_rcvbuf) { |
766e9037 | 408 | atomic_inc(&sk->sk_drops); |
3847ce32 | 409 | trace_sock_rcvqueue_full(sk, skb); |
766e9037 | 410 | return -ENOMEM; |
f0088a50 DV |
411 | } |
412 | ||
c76562b6 | 413 | if (!sk_rmem_schedule(sk, skb, skb->truesize)) { |
766e9037 ED |
414 | atomic_inc(&sk->sk_drops); |
415 | return -ENOBUFS; | |
3ab224be HA |
416 | } |
417 | ||
f0088a50 DV |
418 | skb->dev = NULL; |
419 | skb_set_owner_r(skb, sk); | |
49ad9599 | 420 | |
7fee226a ED |
421 | /* we escape from rcu protected region, make sure we dont leak |
422 | * a norefcounted dst | |
423 | */ | |
424 | skb_dst_force(skb); | |
425 | ||
3b885787 | 426 | spin_lock_irqsave(&list->lock, flags); |
3bc3b96f | 427 | sock_skb_set_dropcount(sk, skb); |
3b885787 NH |
428 | __skb_queue_tail(list, skb); |
429 | spin_unlock_irqrestore(&list->lock, flags); | |
f0088a50 DV |
430 | |
431 | if (!sock_flag(sk, SOCK_DEAD)) | |
676d2369 | 432 | sk->sk_data_ready(sk); |
766e9037 | 433 | return 0; |
f0088a50 | 434 | } |
e6afc8ac | 435 | EXPORT_SYMBOL(__sock_queue_rcv_skb); |
436 | ||
437 | int sock_queue_rcv_skb(struct sock *sk, struct sk_buff *skb) | |
438 | { | |
439 | int err; | |
440 | ||
441 | err = sk_filter(sk, skb); | |
442 | if (err) | |
443 | return err; | |
444 | ||
445 | return __sock_queue_rcv_skb(sk, skb); | |
446 | } | |
f0088a50 DV |
447 | EXPORT_SYMBOL(sock_queue_rcv_skb); |
448 | ||
4f0c40d9 | 449 | int __sk_receive_skb(struct sock *sk, struct sk_buff *skb, |
c3f24cfb | 450 | const int nested, unsigned int trim_cap, bool refcounted) |
f0088a50 DV |
451 | { |
452 | int rc = NET_RX_SUCCESS; | |
453 | ||
4f0c40d9 | 454 | if (sk_filter_trim_cap(sk, skb, trim_cap)) |
f0088a50 DV |
455 | goto discard_and_relse; |
456 | ||
457 | skb->dev = NULL; | |
458 | ||
274f482d | 459 | if (sk_rcvqueues_full(sk, sk->sk_rcvbuf)) { |
c377411f ED |
460 | atomic_inc(&sk->sk_drops); |
461 | goto discard_and_relse; | |
462 | } | |
58a5a7b9 ACM |
463 | if (nested) |
464 | bh_lock_sock_nested(sk); | |
465 | else | |
466 | bh_lock_sock(sk); | |
a5b5bb9a IM |
467 | if (!sock_owned_by_user(sk)) { |
468 | /* | |
469 | * trylock + unlock semantics: | |
470 | */ | |
471 | mutex_acquire(&sk->sk_lock.dep_map, 0, 1, _RET_IP_); | |
472 | ||
c57943a1 | 473 | rc = sk_backlog_rcv(sk, skb); |
a5b5bb9a IM |
474 | |
475 | mutex_release(&sk->sk_lock.dep_map, 1, _RET_IP_); | |
f545a38f | 476 | } else if (sk_add_backlog(sk, skb, sk->sk_rcvbuf)) { |
8eae939f ZY |
477 | bh_unlock_sock(sk); |
478 | atomic_inc(&sk->sk_drops); | |
479 | goto discard_and_relse; | |
480 | } | |
481 | ||
f0088a50 DV |
482 | bh_unlock_sock(sk); |
483 | out: | |
c3f24cfb ED |
484 | if (refcounted) |
485 | sock_put(sk); | |
f0088a50 DV |
486 | return rc; |
487 | discard_and_relse: | |
488 | kfree_skb(skb); | |
489 | goto out; | |
490 | } | |
4f0c40d9 | 491 | EXPORT_SYMBOL(__sk_receive_skb); |
f0088a50 DV |
492 | |
493 | struct dst_entry *__sk_dst_check(struct sock *sk, u32 cookie) | |
494 | { | |
b6c6712a | 495 | struct dst_entry *dst = __sk_dst_get(sk); |
f0088a50 DV |
496 | |
497 | if (dst && dst->obsolete && dst->ops->check(dst, cookie) == NULL) { | |
e022f0b4 | 498 | sk_tx_queue_clear(sk); |
9b8805a3 | 499 | sk->sk_dst_pending_confirm = 0; |
a9b3cd7f | 500 | RCU_INIT_POINTER(sk->sk_dst_cache, NULL); |
f0088a50 DV |
501 | dst_release(dst); |
502 | return NULL; | |
503 | } | |
504 | ||
505 | return dst; | |
506 | } | |
507 | EXPORT_SYMBOL(__sk_dst_check); | |
508 | ||
509 | struct dst_entry *sk_dst_check(struct sock *sk, u32 cookie) | |
510 | { | |
511 | struct dst_entry *dst = sk_dst_get(sk); | |
512 | ||
513 | if (dst && dst->obsolete && dst->ops->check(dst, cookie) == NULL) { | |
514 | sk_dst_reset(sk); | |
515 | dst_release(dst); | |
516 | return NULL; | |
517 | } | |
518 | ||
519 | return dst; | |
520 | } | |
521 | EXPORT_SYMBOL(sk_dst_check); | |
522 | ||
c91f6df2 BH |
523 | static int sock_setbindtodevice(struct sock *sk, char __user *optval, |
524 | int optlen) | |
4878809f DM |
525 | { |
526 | int ret = -ENOPROTOOPT; | |
527 | #ifdef CONFIG_NETDEVICES | |
3b1e0a65 | 528 | struct net *net = sock_net(sk); |
4878809f DM |
529 | char devname[IFNAMSIZ]; |
530 | int index; | |
531 | ||
532 | /* Sorry... */ | |
533 | ret = -EPERM; | |
5e1fccc0 | 534 | if (!ns_capable(net->user_ns, CAP_NET_RAW)) |
4878809f DM |
535 | goto out; |
536 | ||
537 | ret = -EINVAL; | |
538 | if (optlen < 0) | |
539 | goto out; | |
540 | ||
541 | /* Bind this socket to a particular device like "eth0", | |
542 | * as specified in the passed interface name. If the | |
543 | * name is "" or the option length is zero the socket | |
544 | * is not bound. | |
545 | */ | |
546 | if (optlen > IFNAMSIZ - 1) | |
547 | optlen = IFNAMSIZ - 1; | |
548 | memset(devname, 0, sizeof(devname)); | |
549 | ||
550 | ret = -EFAULT; | |
551 | if (copy_from_user(devname, optval, optlen)) | |
552 | goto out; | |
553 | ||
000ba2e4 DM |
554 | index = 0; |
555 | if (devname[0] != '\0') { | |
bf8e56bf | 556 | struct net_device *dev; |
4878809f | 557 | |
bf8e56bf ED |
558 | rcu_read_lock(); |
559 | dev = dev_get_by_name_rcu(net, devname); | |
560 | if (dev) | |
561 | index = dev->ifindex; | |
562 | rcu_read_unlock(); | |
4878809f DM |
563 | ret = -ENODEV; |
564 | if (!dev) | |
565 | goto out; | |
4878809f DM |
566 | } |
567 | ||
568 | lock_sock(sk); | |
569 | sk->sk_bound_dev_if = index; | |
6da5b0f0 MM |
570 | if (sk->sk_prot->rehash) |
571 | sk->sk_prot->rehash(sk); | |
4878809f DM |
572 | sk_dst_reset(sk); |
573 | release_sock(sk); | |
574 | ||
575 | ret = 0; | |
576 | ||
577 | out: | |
578 | #endif | |
579 | ||
580 | return ret; | |
581 | } | |
582 | ||
c91f6df2 BH |
583 | static int sock_getbindtodevice(struct sock *sk, char __user *optval, |
584 | int __user *optlen, int len) | |
585 | { | |
586 | int ret = -ENOPROTOOPT; | |
587 | #ifdef CONFIG_NETDEVICES | |
588 | struct net *net = sock_net(sk); | |
c91f6df2 | 589 | char devname[IFNAMSIZ]; |
c91f6df2 BH |
590 | |
591 | if (sk->sk_bound_dev_if == 0) { | |
592 | len = 0; | |
593 | goto zero; | |
594 | } | |
595 | ||
596 | ret = -EINVAL; | |
597 | if (len < IFNAMSIZ) | |
598 | goto out; | |
599 | ||
5dbe7c17 NS |
600 | ret = netdev_get_name(net, devname, sk->sk_bound_dev_if); |
601 | if (ret) | |
c91f6df2 | 602 | goto out; |
c91f6df2 BH |
603 | |
604 | len = strlen(devname) + 1; | |
605 | ||
606 | ret = -EFAULT; | |
607 | if (copy_to_user(optval, devname, len)) | |
608 | goto out; | |
609 | ||
610 | zero: | |
611 | ret = -EFAULT; | |
612 | if (put_user(len, optlen)) | |
613 | goto out; | |
614 | ||
615 | ret = 0; | |
616 | ||
617 | out: | |
618 | #endif | |
619 | ||
620 | return ret; | |
621 | } | |
622 | ||
c0ef877b PE |
623 | static inline void sock_valbool_flag(struct sock *sk, int bit, int valbool) |
624 | { | |
625 | if (valbool) | |
626 | sock_set_flag(sk, bit); | |
627 | else | |
628 | sock_reset_flag(sk, bit); | |
629 | } | |
630 | ||
f60e5990 | 631 | bool sk_mc_loop(struct sock *sk) |
632 | { | |
633 | if (dev_recursion_level()) | |
634 | return false; | |
635 | if (!sk) | |
636 | return true; | |
637 | switch (sk->sk_family) { | |
638 | case AF_INET: | |
639 | return inet_sk(sk)->mc_loop; | |
640 | #if IS_ENABLED(CONFIG_IPV6) | |
641 | case AF_INET6: | |
642 | return inet6_sk(sk)->mc_loop; | |
643 | #endif | |
644 | } | |
645 | WARN_ON(1); | |
646 | return true; | |
647 | } | |
648 | EXPORT_SYMBOL(sk_mc_loop); | |
649 | ||
1da177e4 LT |
650 | /* |
651 | * This is meant for all protocols to use and covers goings on | |
652 | * at the socket level. Everything here is generic. | |
653 | */ | |
654 | ||
655 | int sock_setsockopt(struct socket *sock, int level, int optname, | |
b7058842 | 656 | char __user *optval, unsigned int optlen) |
1da177e4 | 657 | { |
80b14dee | 658 | struct sock_txtime sk_txtime; |
2a91525c | 659 | struct sock *sk = sock->sk; |
1da177e4 LT |
660 | int val; |
661 | int valbool; | |
662 | struct linger ling; | |
663 | int ret = 0; | |
4ec93edb | 664 | |
1da177e4 LT |
665 | /* |
666 | * Options without arguments | |
667 | */ | |
668 | ||
4878809f | 669 | if (optname == SO_BINDTODEVICE) |
c91f6df2 | 670 | return sock_setbindtodevice(sk, optval, optlen); |
4878809f | 671 | |
e71a4783 SH |
672 | if (optlen < sizeof(int)) |
673 | return -EINVAL; | |
4ec93edb | 674 | |
1da177e4 LT |
675 | if (get_user(val, (int __user *)optval)) |
676 | return -EFAULT; | |
4ec93edb | 677 | |
2a91525c | 678 | valbool = val ? 1 : 0; |
1da177e4 LT |
679 | |
680 | lock_sock(sk); | |
681 | ||
2a91525c | 682 | switch (optname) { |
e71a4783 | 683 | case SO_DEBUG: |
2a91525c | 684 | if (val && !capable(CAP_NET_ADMIN)) |
e71a4783 | 685 | ret = -EACCES; |
2a91525c | 686 | else |
c0ef877b | 687 | sock_valbool_flag(sk, SOCK_DBG, valbool); |
e71a4783 SH |
688 | break; |
689 | case SO_REUSEADDR: | |
cdb8744d | 690 | sk->sk_reuse = (valbool ? SK_CAN_REUSE : SK_NO_REUSE); |
e71a4783 | 691 | break; |
055dc21a TH |
692 | case SO_REUSEPORT: |
693 | sk->sk_reuseport = valbool; | |
694 | break; | |
e71a4783 | 695 | case SO_TYPE: |
49c794e9 | 696 | case SO_PROTOCOL: |
0d6038ee | 697 | case SO_DOMAIN: |
e71a4783 SH |
698 | case SO_ERROR: |
699 | ret = -ENOPROTOOPT; | |
700 | break; | |
701 | case SO_DONTROUTE: | |
c0ef877b | 702 | sock_valbool_flag(sk, SOCK_LOCALROUTE, valbool); |
0fbe82e6 | 703 | sk_dst_reset(sk); |
e71a4783 SH |
704 | break; |
705 | case SO_BROADCAST: | |
706 | sock_valbool_flag(sk, SOCK_BROADCAST, valbool); | |
707 | break; | |
708 | case SO_SNDBUF: | |
709 | /* Don't error on this BSD doesn't and if you think | |
82981930 ED |
710 | * about it this is right. Otherwise apps have to |
711 | * play 'guess the biggest size' games. RCVBUF/SNDBUF | |
712 | * are treated in BSD as hints | |
713 | */ | |
714 | val = min_t(u32, val, sysctl_wmem_max); | |
b0573dea | 715 | set_sndbuf: |
e71a4783 | 716 | sk->sk_userlocks |= SOCK_SNDBUF_LOCK; |
b98b0bc8 | 717 | sk->sk_sndbuf = max_t(int, val * 2, SOCK_MIN_SNDBUF); |
82981930 | 718 | /* Wake up sending tasks if we upped the value. */ |
e71a4783 SH |
719 | sk->sk_write_space(sk); |
720 | break; | |
1da177e4 | 721 | |
e71a4783 SH |
722 | case SO_SNDBUFFORCE: |
723 | if (!capable(CAP_NET_ADMIN)) { | |
724 | ret = -EPERM; | |
725 | break; | |
726 | } | |
727 | goto set_sndbuf; | |
b0573dea | 728 | |
e71a4783 SH |
729 | case SO_RCVBUF: |
730 | /* Don't error on this BSD doesn't and if you think | |
82981930 ED |
731 | * about it this is right. Otherwise apps have to |
732 | * play 'guess the biggest size' games. RCVBUF/SNDBUF | |
733 | * are treated in BSD as hints | |
734 | */ | |
735 | val = min_t(u32, val, sysctl_rmem_max); | |
b0573dea | 736 | set_rcvbuf: |
e71a4783 SH |
737 | sk->sk_userlocks |= SOCK_RCVBUF_LOCK; |
738 | /* | |
739 | * We double it on the way in to account for | |
740 | * "struct sk_buff" etc. overhead. Applications | |
741 | * assume that the SO_RCVBUF setting they make will | |
742 | * allow that much actual data to be received on that | |
743 | * socket. | |
744 | * | |
745 | * Applications are unaware that "struct sk_buff" and | |
746 | * other overheads allocate from the receive buffer | |
747 | * during socket buffer allocation. | |
748 | * | |
749 | * And after considering the possible alternatives, | |
750 | * returning the value we actually used in getsockopt | |
751 | * is the most desirable behavior. | |
752 | */ | |
b98b0bc8 | 753 | sk->sk_rcvbuf = max_t(int, val * 2, SOCK_MIN_RCVBUF); |
e71a4783 SH |
754 | break; |
755 | ||
756 | case SO_RCVBUFFORCE: | |
757 | if (!capable(CAP_NET_ADMIN)) { | |
758 | ret = -EPERM; | |
1da177e4 | 759 | break; |
e71a4783 SH |
760 | } |
761 | goto set_rcvbuf; | |
1da177e4 | 762 | |
e71a4783 | 763 | case SO_KEEPALIVE: |
4b9d07a4 UB |
764 | if (sk->sk_prot->keepalive) |
765 | sk->sk_prot->keepalive(sk, valbool); | |
e71a4783 SH |
766 | sock_valbool_flag(sk, SOCK_KEEPOPEN, valbool); |
767 | break; | |
768 | ||
769 | case SO_OOBINLINE: | |
770 | sock_valbool_flag(sk, SOCK_URGINLINE, valbool); | |
771 | break; | |
772 | ||
773 | case SO_NO_CHECK: | |
28448b80 | 774 | sk->sk_no_check_tx = valbool; |
e71a4783 SH |
775 | break; |
776 | ||
777 | case SO_PRIORITY: | |
5e1fccc0 EB |
778 | if ((val >= 0 && val <= 6) || |
779 | ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN)) | |
e71a4783 SH |
780 | sk->sk_priority = val; |
781 | else | |
782 | ret = -EPERM; | |
783 | break; | |
784 | ||
785 | case SO_LINGER: | |
786 | if (optlen < sizeof(ling)) { | |
787 | ret = -EINVAL; /* 1003.1g */ | |
1da177e4 | 788 | break; |
e71a4783 | 789 | } |
2a91525c | 790 | if (copy_from_user(&ling, optval, sizeof(ling))) { |
e71a4783 | 791 | ret = -EFAULT; |
1da177e4 | 792 | break; |
e71a4783 SH |
793 | } |
794 | if (!ling.l_onoff) | |
795 | sock_reset_flag(sk, SOCK_LINGER); | |
796 | else { | |
1da177e4 | 797 | #if (BITS_PER_LONG == 32) |
e71a4783 SH |
798 | if ((unsigned int)ling.l_linger >= MAX_SCHEDULE_TIMEOUT/HZ) |
799 | sk->sk_lingertime = MAX_SCHEDULE_TIMEOUT; | |
1da177e4 | 800 | else |
e71a4783 SH |
801 | #endif |
802 | sk->sk_lingertime = (unsigned int)ling.l_linger * HZ; | |
803 | sock_set_flag(sk, SOCK_LINGER); | |
804 | } | |
805 | break; | |
806 | ||
807 | case SO_BSDCOMPAT: | |
808 | sock_warn_obsolete_bsdism("setsockopt"); | |
809 | break; | |
810 | ||
811 | case SO_PASSCRED: | |
812 | if (valbool) | |
813 | set_bit(SOCK_PASSCRED, &sock->flags); | |
814 | else | |
815 | clear_bit(SOCK_PASSCRED, &sock->flags); | |
816 | break; | |
817 | ||
818 | case SO_TIMESTAMP: | |
92f37fd2 | 819 | case SO_TIMESTAMPNS: |
e71a4783 | 820 | if (valbool) { |
92f37fd2 ED |
821 | if (optname == SO_TIMESTAMP) |
822 | sock_reset_flag(sk, SOCK_RCVTSTAMPNS); | |
823 | else | |
824 | sock_set_flag(sk, SOCK_RCVTSTAMPNS); | |
e71a4783 | 825 | sock_set_flag(sk, SOCK_RCVTSTAMP); |
20d49473 | 826 | sock_enable_timestamp(sk, SOCK_TIMESTAMP); |
92f37fd2 | 827 | } else { |
e71a4783 | 828 | sock_reset_flag(sk, SOCK_RCVTSTAMP); |
92f37fd2 ED |
829 | sock_reset_flag(sk, SOCK_RCVTSTAMPNS); |
830 | } | |
e71a4783 SH |
831 | break; |
832 | ||
20d49473 PO |
833 | case SO_TIMESTAMPING: |
834 | if (val & ~SOF_TIMESTAMPING_MASK) { | |
f249fb78 | 835 | ret = -EINVAL; |
20d49473 PO |
836 | break; |
837 | } | |
b245be1f | 838 | |
09c2d251 | 839 | if (val & SOF_TIMESTAMPING_OPT_ID && |
4ed2d765 | 840 | !(sk->sk_tsflags & SOF_TIMESTAMPING_OPT_ID)) { |
ac5cc977 WC |
841 | if (sk->sk_protocol == IPPROTO_TCP && |
842 | sk->sk_type == SOCK_STREAM) { | |
6db8b963 SHY |
843 | if ((1 << sk->sk_state) & |
844 | (TCPF_CLOSE | TCPF_LISTEN)) { | |
4ed2d765 WB |
845 | ret = -EINVAL; |
846 | break; | |
847 | } | |
848 | sk->sk_tskey = tcp_sk(sk)->snd_una; | |
849 | } else { | |
850 | sk->sk_tskey = 0; | |
851 | } | |
852 | } | |
1c885808 FY |
853 | |
854 | if (val & SOF_TIMESTAMPING_OPT_STATS && | |
855 | !(val & SOF_TIMESTAMPING_OPT_TSONLY)) { | |
856 | ret = -EINVAL; | |
857 | break; | |
858 | } | |
859 | ||
b9f40e21 | 860 | sk->sk_tsflags = val; |
20d49473 PO |
861 | if (val & SOF_TIMESTAMPING_RX_SOFTWARE) |
862 | sock_enable_timestamp(sk, | |
863 | SOCK_TIMESTAMPING_RX_SOFTWARE); | |
864 | else | |
865 | sock_disable_timestamp(sk, | |
08e29af3 | 866 | (1UL << SOCK_TIMESTAMPING_RX_SOFTWARE)); |
20d49473 PO |
867 | break; |
868 | ||
e71a4783 SH |
869 | case SO_RCVLOWAT: |
870 | if (val < 0) | |
871 | val = INT_MAX; | |
d1361840 ED |
872 | if (sock->ops->set_rcvlowat) |
873 | ret = sock->ops->set_rcvlowat(sk, val); | |
874 | else | |
875 | sk->sk_rcvlowat = val ? : 1; | |
e71a4783 SH |
876 | break; |
877 | ||
878 | case SO_RCVTIMEO: | |
879 | ret = sock_set_timeout(&sk->sk_rcvtimeo, optval, optlen); | |
880 | break; | |
881 | ||
882 | case SO_SNDTIMEO: | |
883 | ret = sock_set_timeout(&sk->sk_sndtimeo, optval, optlen); | |
884 | break; | |
1da177e4 | 885 | |
e71a4783 SH |
886 | case SO_ATTACH_FILTER: |
887 | ret = -EINVAL; | |
888 | if (optlen == sizeof(struct sock_fprog)) { | |
889 | struct sock_fprog fprog; | |
1da177e4 | 890 | |
e71a4783 SH |
891 | ret = -EFAULT; |
892 | if (copy_from_user(&fprog, optval, sizeof(fprog))) | |
1da177e4 | 893 | break; |
e71a4783 SH |
894 | |
895 | ret = sk_attach_filter(&fprog, sk); | |
896 | } | |
897 | break; | |
898 | ||
89aa0758 AS |
899 | case SO_ATTACH_BPF: |
900 | ret = -EINVAL; | |
901 | if (optlen == sizeof(u32)) { | |
902 | u32 ufd; | |
903 | ||
904 | ret = -EFAULT; | |
905 | if (copy_from_user(&ufd, optval, sizeof(ufd))) | |
906 | break; | |
907 | ||
908 | ret = sk_attach_bpf(ufd, sk); | |
909 | } | |
910 | break; | |
911 | ||
538950a1 CG |
912 | case SO_ATTACH_REUSEPORT_CBPF: |
913 | ret = -EINVAL; | |
914 | if (optlen == sizeof(struct sock_fprog)) { | |
915 | struct sock_fprog fprog; | |
916 | ||
917 | ret = -EFAULT; | |
918 | if (copy_from_user(&fprog, optval, sizeof(fprog))) | |
919 | break; | |
920 | ||
921 | ret = sk_reuseport_attach_filter(&fprog, sk); | |
922 | } | |
923 | break; | |
924 | ||
925 | case SO_ATTACH_REUSEPORT_EBPF: | |
926 | ret = -EINVAL; | |
927 | if (optlen == sizeof(u32)) { | |
928 | u32 ufd; | |
929 | ||
930 | ret = -EFAULT; | |
931 | if (copy_from_user(&ufd, optval, sizeof(ufd))) | |
932 | break; | |
933 | ||
934 | ret = sk_reuseport_attach_bpf(ufd, sk); | |
935 | } | |
936 | break; | |
937 | ||
e71a4783 | 938 | case SO_DETACH_FILTER: |
55b33325 | 939 | ret = sk_detach_filter(sk); |
e71a4783 | 940 | break; |
1da177e4 | 941 | |
d59577b6 VB |
942 | case SO_LOCK_FILTER: |
943 | if (sock_flag(sk, SOCK_FILTER_LOCKED) && !valbool) | |
944 | ret = -EPERM; | |
945 | else | |
946 | sock_valbool_flag(sk, SOCK_FILTER_LOCKED, valbool); | |
947 | break; | |
948 | ||
e71a4783 SH |
949 | case SO_PASSSEC: |
950 | if (valbool) | |
951 | set_bit(SOCK_PASSSEC, &sock->flags); | |
952 | else | |
953 | clear_bit(SOCK_PASSSEC, &sock->flags); | |
954 | break; | |
4a19ec58 | 955 | case SO_MARK: |
50254256 | 956 | if (!ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN)) { |
4a19ec58 | 957 | ret = -EPERM; |
50254256 | 958 | } else if (val != sk->sk_mark) { |
4a19ec58 | 959 | sk->sk_mark = val; |
50254256 DB |
960 | sk_dst_reset(sk); |
961 | } | |
4a19ec58 | 962 | break; |
877ce7c1 | 963 | |
3b885787 | 964 | case SO_RXQ_OVFL: |
8083f0fc | 965 | sock_valbool_flag(sk, SOCK_RXQ_OVFL, valbool); |
3b885787 | 966 | break; |
6e3e939f JB |
967 | |
968 | case SO_WIFI_STATUS: | |
969 | sock_valbool_flag(sk, SOCK_WIFI_STATUS, valbool); | |
970 | break; | |
971 | ||
ef64a54f PE |
972 | case SO_PEEK_OFF: |
973 | if (sock->ops->set_peek_off) | |
12663bfc | 974 | ret = sock->ops->set_peek_off(sk, val); |
ef64a54f PE |
975 | else |
976 | ret = -EOPNOTSUPP; | |
977 | break; | |
3bdc0eba BG |
978 | |
979 | case SO_NOFCS: | |
980 | sock_valbool_flag(sk, SOCK_NOFCS, valbool); | |
981 | break; | |
982 | ||
7d4c04fc KJ |
983 | case SO_SELECT_ERR_QUEUE: |
984 | sock_valbool_flag(sk, SOCK_SELECT_ERR_QUEUE, valbool); | |
985 | break; | |
986 | ||
e0d1095a | 987 | #ifdef CONFIG_NET_RX_BUSY_POLL |
64b0dc51 | 988 | case SO_BUSY_POLL: |
dafcc438 ET |
989 | /* allow unprivileged users to decrease the value */ |
990 | if ((val > sk->sk_ll_usec) && !capable(CAP_NET_ADMIN)) | |
991 | ret = -EPERM; | |
992 | else { | |
993 | if (val < 0) | |
994 | ret = -EINVAL; | |
995 | else | |
996 | sk->sk_ll_usec = val; | |
997 | } | |
998 | break; | |
999 | #endif | |
62748f32 ED |
1000 | |
1001 | case SO_MAX_PACING_RATE: | |
218af599 ED |
1002 | if (val != ~0U) |
1003 | cmpxchg(&sk->sk_pacing_status, | |
1004 | SK_PACING_NONE, | |
1005 | SK_PACING_NEEDED); | |
76a9ebe8 | 1006 | sk->sk_max_pacing_rate = (val == ~0U) ? ~0UL : val; |
62748f32 ED |
1007 | sk->sk_pacing_rate = min(sk->sk_pacing_rate, |
1008 | sk->sk_max_pacing_rate); | |
1009 | break; | |
1010 | ||
70da268b ED |
1011 | case SO_INCOMING_CPU: |
1012 | sk->sk_incoming_cpu = val; | |
1013 | break; | |
1014 | ||
a87cb3e4 TH |
1015 | case SO_CNX_ADVICE: |
1016 | if (val == 1) | |
1017 | dst_negative_advice(sk); | |
1018 | break; | |
76851d12 WB |
1019 | |
1020 | case SO_ZEROCOPY: | |
28190752 | 1021 | if (sk->sk_family == PF_INET || sk->sk_family == PF_INET6) { |
b5947e5d WB |
1022 | if (!((sk->sk_type == SOCK_STREAM && |
1023 | sk->sk_protocol == IPPROTO_TCP) || | |
1024 | (sk->sk_type == SOCK_DGRAM && | |
1025 | sk->sk_protocol == IPPROTO_UDP))) | |
28190752 | 1026 | ret = -ENOTSUPP; |
28190752 | 1027 | } else if (sk->sk_family != PF_RDS) { |
76851d12 | 1028 | ret = -ENOTSUPP; |
28190752 SV |
1029 | } |
1030 | if (!ret) { | |
1031 | if (val < 0 || val > 1) | |
1032 | ret = -EINVAL; | |
1033 | else | |
1034 | sock_valbool_flag(sk, SOCK_ZEROCOPY, valbool); | |
28190752 | 1035 | } |
334e6413 JSP |
1036 | break; |
1037 | ||
80b14dee RC |
1038 | case SO_TXTIME: |
1039 | if (!ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN)) { | |
1040 | ret = -EPERM; | |
1041 | } else if (optlen != sizeof(struct sock_txtime)) { | |
1042 | ret = -EINVAL; | |
1043 | } else if (copy_from_user(&sk_txtime, optval, | |
1044 | sizeof(struct sock_txtime))) { | |
1045 | ret = -EFAULT; | |
1046 | } else if (sk_txtime.flags & ~SOF_TXTIME_FLAGS_MASK) { | |
1047 | ret = -EINVAL; | |
1048 | } else { | |
1049 | sock_valbool_flag(sk, SOCK_TXTIME, true); | |
1050 | sk->sk_clockid = sk_txtime.clockid; | |
1051 | sk->sk_txtime_deadline_mode = | |
1052 | !!(sk_txtime.flags & SOF_TXTIME_DEADLINE_MODE); | |
4b15c707 JSP |
1053 | sk->sk_txtime_report_errors = |
1054 | !!(sk_txtime.flags & SOF_TXTIME_REPORT_ERRORS); | |
80b14dee RC |
1055 | } |
1056 | break; | |
1057 | ||
e71a4783 SH |
1058 | default: |
1059 | ret = -ENOPROTOOPT; | |
1060 | break; | |
4ec93edb | 1061 | } |
1da177e4 LT |
1062 | release_sock(sk); |
1063 | return ret; | |
1064 | } | |
2a91525c | 1065 | EXPORT_SYMBOL(sock_setsockopt); |
1da177e4 LT |
1066 | |
1067 | ||
8f09898b | 1068 | static void cred_to_ucred(struct pid *pid, const struct cred *cred, |
1069 | struct ucred *ucred) | |
3f551f94 EB |
1070 | { |
1071 | ucred->pid = pid_vnr(pid); | |
1072 | ucred->uid = ucred->gid = -1; | |
1073 | if (cred) { | |
1074 | struct user_namespace *current_ns = current_user_ns(); | |
1075 | ||
b2e4f544 EB |
1076 | ucred->uid = from_kuid_munged(current_ns, cred->euid); |
1077 | ucred->gid = from_kgid_munged(current_ns, cred->egid); | |
3f551f94 EB |
1078 | } |
1079 | } | |
1080 | ||
28b5ba2a DH |
1081 | static int groups_to_user(gid_t __user *dst, const struct group_info *src) |
1082 | { | |
1083 | struct user_namespace *user_ns = current_user_ns(); | |
1084 | int i; | |
1085 | ||
1086 | for (i = 0; i < src->ngroups; i++) | |
1087 | if (put_user(from_kgid_munged(user_ns, src->gid[i]), dst + i)) | |
1088 | return -EFAULT; | |
1089 | ||
1090 | return 0; | |
1091 | } | |
1092 | ||
1da177e4 LT |
1093 | int sock_getsockopt(struct socket *sock, int level, int optname, |
1094 | char __user *optval, int __user *optlen) | |
1095 | { | |
1096 | struct sock *sk = sock->sk; | |
4ec93edb | 1097 | |
e71a4783 | 1098 | union { |
4ec93edb | 1099 | int val; |
5daab9db | 1100 | u64 val64; |
4ec93edb | 1101 | struct linger ling; |
1da177e4 | 1102 | struct timeval tm; |
80b14dee | 1103 | struct sock_txtime txtime; |
1da177e4 | 1104 | } v; |
4ec93edb | 1105 | |
4d0392be | 1106 | int lv = sizeof(int); |
1da177e4 | 1107 | int len; |
4ec93edb | 1108 | |
e71a4783 | 1109 | if (get_user(len, optlen)) |
4ec93edb | 1110 | return -EFAULT; |
e71a4783 | 1111 | if (len < 0) |
1da177e4 | 1112 | return -EINVAL; |
4ec93edb | 1113 | |
50fee1de | 1114 | memset(&v, 0, sizeof(v)); |
df0bca04 | 1115 | |
2a91525c | 1116 | switch (optname) { |
e71a4783 SH |
1117 | case SO_DEBUG: |
1118 | v.val = sock_flag(sk, SOCK_DBG); | |
1119 | break; | |
1120 | ||
1121 | case SO_DONTROUTE: | |
1122 | v.val = sock_flag(sk, SOCK_LOCALROUTE); | |
1123 | break; | |
1124 | ||
1125 | case SO_BROADCAST: | |
1b23a5df | 1126 | v.val = sock_flag(sk, SOCK_BROADCAST); |
e71a4783 SH |
1127 | break; |
1128 | ||
1129 | case SO_SNDBUF: | |
1130 | v.val = sk->sk_sndbuf; | |
1131 | break; | |
1132 | ||
1133 | case SO_RCVBUF: | |
1134 | v.val = sk->sk_rcvbuf; | |
1135 | break; | |
1136 | ||
1137 | case SO_REUSEADDR: | |
1138 | v.val = sk->sk_reuse; | |
1139 | break; | |
1140 | ||
055dc21a TH |
1141 | case SO_REUSEPORT: |
1142 | v.val = sk->sk_reuseport; | |
1143 | break; | |
1144 | ||
e71a4783 | 1145 | case SO_KEEPALIVE: |
1b23a5df | 1146 | v.val = sock_flag(sk, SOCK_KEEPOPEN); |
e71a4783 SH |
1147 | break; |
1148 | ||
1149 | case SO_TYPE: | |
1150 | v.val = sk->sk_type; | |
1151 | break; | |
1152 | ||
49c794e9 JE |
1153 | case SO_PROTOCOL: |
1154 | v.val = sk->sk_protocol; | |
1155 | break; | |
1156 | ||
0d6038ee JE |
1157 | case SO_DOMAIN: |
1158 | v.val = sk->sk_family; | |
1159 | break; | |
1160 | ||
e71a4783 SH |
1161 | case SO_ERROR: |
1162 | v.val = -sock_error(sk); | |
2a91525c | 1163 | if (v.val == 0) |
e71a4783 SH |
1164 | v.val = xchg(&sk->sk_err_soft, 0); |
1165 | break; | |
1166 | ||
1167 | case SO_OOBINLINE: | |
1b23a5df | 1168 | v.val = sock_flag(sk, SOCK_URGINLINE); |
e71a4783 SH |
1169 | break; |
1170 | ||
1171 | case SO_NO_CHECK: | |
28448b80 | 1172 | v.val = sk->sk_no_check_tx; |
e71a4783 SH |
1173 | break; |
1174 | ||
1175 | case SO_PRIORITY: | |
1176 | v.val = sk->sk_priority; | |
1177 | break; | |
1178 | ||
1179 | case SO_LINGER: | |
1180 | lv = sizeof(v.ling); | |
1b23a5df | 1181 | v.ling.l_onoff = sock_flag(sk, SOCK_LINGER); |
e71a4783 SH |
1182 | v.ling.l_linger = sk->sk_lingertime / HZ; |
1183 | break; | |
1184 | ||
1185 | case SO_BSDCOMPAT: | |
1186 | sock_warn_obsolete_bsdism("getsockopt"); | |
1187 | break; | |
1188 | ||
1189 | case SO_TIMESTAMP: | |
92f37fd2 ED |
1190 | v.val = sock_flag(sk, SOCK_RCVTSTAMP) && |
1191 | !sock_flag(sk, SOCK_RCVTSTAMPNS); | |
1192 | break; | |
1193 | ||
1194 | case SO_TIMESTAMPNS: | |
1195 | v.val = sock_flag(sk, SOCK_RCVTSTAMPNS); | |
e71a4783 SH |
1196 | break; |
1197 | ||
20d49473 | 1198 | case SO_TIMESTAMPING: |
b9f40e21 | 1199 | v.val = sk->sk_tsflags; |
20d49473 PO |
1200 | break; |
1201 | ||
e71a4783 | 1202 | case SO_RCVTIMEO: |
2a91525c | 1203 | lv = sizeof(struct timeval); |
e71a4783 SH |
1204 | if (sk->sk_rcvtimeo == MAX_SCHEDULE_TIMEOUT) { |
1205 | v.tm.tv_sec = 0; | |
1206 | v.tm.tv_usec = 0; | |
1207 | } else { | |
1208 | v.tm.tv_sec = sk->sk_rcvtimeo / HZ; | |
8ccde4c5 | 1209 | v.tm.tv_usec = ((sk->sk_rcvtimeo % HZ) * USEC_PER_SEC) / HZ; |
e71a4783 SH |
1210 | } |
1211 | break; | |
1212 | ||
1213 | case SO_SNDTIMEO: | |
2a91525c | 1214 | lv = sizeof(struct timeval); |
e71a4783 SH |
1215 | if (sk->sk_sndtimeo == MAX_SCHEDULE_TIMEOUT) { |
1216 | v.tm.tv_sec = 0; | |
1217 | v.tm.tv_usec = 0; | |
1218 | } else { | |
1219 | v.tm.tv_sec = sk->sk_sndtimeo / HZ; | |
8ccde4c5 | 1220 | v.tm.tv_usec = ((sk->sk_sndtimeo % HZ) * USEC_PER_SEC) / HZ; |
e71a4783 SH |
1221 | } |
1222 | break; | |
1da177e4 | 1223 | |
e71a4783 SH |
1224 | case SO_RCVLOWAT: |
1225 | v.val = sk->sk_rcvlowat; | |
1226 | break; | |
1da177e4 | 1227 | |
e71a4783 | 1228 | case SO_SNDLOWAT: |
2a91525c | 1229 | v.val = 1; |
e71a4783 | 1230 | break; |
1da177e4 | 1231 | |
e71a4783 | 1232 | case SO_PASSCRED: |
82981930 | 1233 | v.val = !!test_bit(SOCK_PASSCRED, &sock->flags); |
e71a4783 | 1234 | break; |
1da177e4 | 1235 | |
e71a4783 | 1236 | case SO_PEERCRED: |
109f6e39 EB |
1237 | { |
1238 | struct ucred peercred; | |
1239 | if (len > sizeof(peercred)) | |
1240 | len = sizeof(peercred); | |
1241 | cred_to_ucred(sk->sk_peer_pid, sk->sk_peer_cred, &peercred); | |
1242 | if (copy_to_user(optval, &peercred, len)) | |
e71a4783 SH |
1243 | return -EFAULT; |
1244 | goto lenout; | |
109f6e39 | 1245 | } |
1da177e4 | 1246 | |
28b5ba2a DH |
1247 | case SO_PEERGROUPS: |
1248 | { | |
1249 | int ret, n; | |
1250 | ||
1251 | if (!sk->sk_peer_cred) | |
1252 | return -ENODATA; | |
1253 | ||
1254 | n = sk->sk_peer_cred->group_info->ngroups; | |
1255 | if (len < n * sizeof(gid_t)) { | |
1256 | len = n * sizeof(gid_t); | |
1257 | return put_user(len, optlen) ? -EFAULT : -ERANGE; | |
1258 | } | |
1259 | len = n * sizeof(gid_t); | |
1260 | ||
1261 | ret = groups_to_user((gid_t __user *)optval, | |
1262 | sk->sk_peer_cred->group_info); | |
1263 | if (ret) | |
1264 | return ret; | |
1265 | goto lenout; | |
1266 | } | |
1267 | ||
e71a4783 SH |
1268 | case SO_PEERNAME: |
1269 | { | |
1270 | char address[128]; | |
1271 | ||
9b2c45d4 DV |
1272 | lv = sock->ops->getname(sock, (struct sockaddr *)address, 2); |
1273 | if (lv < 0) | |
e71a4783 SH |
1274 | return -ENOTCONN; |
1275 | if (lv < len) | |
1276 | return -EINVAL; | |
1277 | if (copy_to_user(optval, address, len)) | |
1278 | return -EFAULT; | |
1279 | goto lenout; | |
1280 | } | |
1da177e4 | 1281 | |
e71a4783 SH |
1282 | /* Dubious BSD thing... Probably nobody even uses it, but |
1283 | * the UNIX standard wants it for whatever reason... -DaveM | |
1284 | */ | |
1285 | case SO_ACCEPTCONN: | |
1286 | v.val = sk->sk_state == TCP_LISTEN; | |
1287 | break; | |
1da177e4 | 1288 | |
e71a4783 | 1289 | case SO_PASSSEC: |
82981930 | 1290 | v.val = !!test_bit(SOCK_PASSSEC, &sock->flags); |
e71a4783 | 1291 | break; |
877ce7c1 | 1292 | |
e71a4783 SH |
1293 | case SO_PEERSEC: |
1294 | return security_socket_getpeersec_stream(sock, optval, optlen, len); | |
1da177e4 | 1295 | |
4a19ec58 LAT |
1296 | case SO_MARK: |
1297 | v.val = sk->sk_mark; | |
1298 | break; | |
1299 | ||
3b885787 | 1300 | case SO_RXQ_OVFL: |
1b23a5df | 1301 | v.val = sock_flag(sk, SOCK_RXQ_OVFL); |
3b885787 NH |
1302 | break; |
1303 | ||
6e3e939f | 1304 | case SO_WIFI_STATUS: |
1b23a5df | 1305 | v.val = sock_flag(sk, SOCK_WIFI_STATUS); |
6e3e939f JB |
1306 | break; |
1307 | ||
ef64a54f PE |
1308 | case SO_PEEK_OFF: |
1309 | if (!sock->ops->set_peek_off) | |
1310 | return -EOPNOTSUPP; | |
1311 | ||
1312 | v.val = sk->sk_peek_off; | |
1313 | break; | |
bc2f7996 | 1314 | case SO_NOFCS: |
1b23a5df | 1315 | v.val = sock_flag(sk, SOCK_NOFCS); |
bc2f7996 | 1316 | break; |
c91f6df2 | 1317 | |
f7b86bfe | 1318 | case SO_BINDTODEVICE: |
c91f6df2 BH |
1319 | return sock_getbindtodevice(sk, optval, optlen, len); |
1320 | ||
a8fc9277 PE |
1321 | case SO_GET_FILTER: |
1322 | len = sk_get_filter(sk, (struct sock_filter __user *)optval, len); | |
1323 | if (len < 0) | |
1324 | return len; | |
1325 | ||
1326 | goto lenout; | |
c91f6df2 | 1327 | |
d59577b6 VB |
1328 | case SO_LOCK_FILTER: |
1329 | v.val = sock_flag(sk, SOCK_FILTER_LOCKED); | |
1330 | break; | |
1331 | ||
ea02f941 MS |
1332 | case SO_BPF_EXTENSIONS: |
1333 | v.val = bpf_tell_extensions(); | |
1334 | break; | |
1335 | ||
7d4c04fc KJ |
1336 | case SO_SELECT_ERR_QUEUE: |
1337 | v.val = sock_flag(sk, SOCK_SELECT_ERR_QUEUE); | |
1338 | break; | |
1339 | ||
e0d1095a | 1340 | #ifdef CONFIG_NET_RX_BUSY_POLL |
64b0dc51 | 1341 | case SO_BUSY_POLL: |
dafcc438 ET |
1342 | v.val = sk->sk_ll_usec; |
1343 | break; | |
1344 | #endif | |
1345 | ||
62748f32 | 1346 | case SO_MAX_PACING_RATE: |
76a9ebe8 ED |
1347 | /* 32bit version */ |
1348 | v.val = min_t(unsigned long, sk->sk_max_pacing_rate, ~0U); | |
62748f32 ED |
1349 | break; |
1350 | ||
2c8c56e1 ED |
1351 | case SO_INCOMING_CPU: |
1352 | v.val = sk->sk_incoming_cpu; | |
1353 | break; | |
1354 | ||
a2d133b1 JH |
1355 | case SO_MEMINFO: |
1356 | { | |
1357 | u32 meminfo[SK_MEMINFO_VARS]; | |
1358 | ||
1359 | if (get_user(len, optlen)) | |
1360 | return -EFAULT; | |
1361 | ||
1362 | sk_get_meminfo(sk, meminfo); | |
1363 | ||
1364 | len = min_t(unsigned int, len, sizeof(meminfo)); | |
1365 | if (copy_to_user(optval, &meminfo, len)) | |
1366 | return -EFAULT; | |
1367 | ||
1368 | goto lenout; | |
1369 | } | |
6d433902 SS |
1370 | |
1371 | #ifdef CONFIG_NET_RX_BUSY_POLL | |
1372 | case SO_INCOMING_NAPI_ID: | |
1373 | v.val = READ_ONCE(sk->sk_napi_id); | |
1374 | ||
1375 | /* aggregate non-NAPI IDs down to 0 */ | |
1376 | if (v.val < MIN_NAPI_ID) | |
1377 | v.val = 0; | |
1378 | ||
1379 | break; | |
1380 | #endif | |
1381 | ||
5daab9db CF |
1382 | case SO_COOKIE: |
1383 | lv = sizeof(u64); | |
1384 | if (len < lv) | |
1385 | return -EINVAL; | |
1386 | v.val64 = sock_gen_cookie(sk); | |
1387 | break; | |
1388 | ||
76851d12 WB |
1389 | case SO_ZEROCOPY: |
1390 | v.val = sock_flag(sk, SOCK_ZEROCOPY); | |
1391 | break; | |
1392 | ||
80b14dee RC |
1393 | case SO_TXTIME: |
1394 | lv = sizeof(v.txtime); | |
1395 | v.txtime.clockid = sk->sk_clockid; | |
1396 | v.txtime.flags |= sk->sk_txtime_deadline_mode ? | |
1397 | SOF_TXTIME_DEADLINE_MODE : 0; | |
4b15c707 JSP |
1398 | v.txtime.flags |= sk->sk_txtime_report_errors ? |
1399 | SOF_TXTIME_REPORT_ERRORS : 0; | |
80b14dee RC |
1400 | break; |
1401 | ||
e71a4783 | 1402 | default: |
443b5991 YH |
1403 | /* We implement the SO_SNDLOWAT etc to not be settable |
1404 | * (1003.1g 7). | |
1405 | */ | |
e71a4783 | 1406 | return -ENOPROTOOPT; |
1da177e4 | 1407 | } |
e71a4783 | 1408 | |
1da177e4 LT |
1409 | if (len > lv) |
1410 | len = lv; | |
1411 | if (copy_to_user(optval, &v, len)) | |
1412 | return -EFAULT; | |
1413 | lenout: | |
4ec93edb YH |
1414 | if (put_user(len, optlen)) |
1415 | return -EFAULT; | |
1416 | return 0; | |
1da177e4 LT |
1417 | } |
1418 | ||
a5b5bb9a IM |
1419 | /* |
1420 | * Initialize an sk_lock. | |
1421 | * | |
1422 | * (We also register the sk_lock with the lock validator.) | |
1423 | */ | |
b6f99a21 | 1424 | static inline void sock_lock_init(struct sock *sk) |
a5b5bb9a | 1425 | { |
cdfbabfb DH |
1426 | if (sk->sk_kern_sock) |
1427 | sock_lock_init_class_and_name( | |
1428 | sk, | |
1429 | af_family_kern_slock_key_strings[sk->sk_family], | |
1430 | af_family_kern_slock_keys + sk->sk_family, | |
1431 | af_family_kern_key_strings[sk->sk_family], | |
1432 | af_family_kern_keys + sk->sk_family); | |
1433 | else | |
1434 | sock_lock_init_class_and_name( | |
1435 | sk, | |
ed07536e PZ |
1436 | af_family_slock_key_strings[sk->sk_family], |
1437 | af_family_slock_keys + sk->sk_family, | |
1438 | af_family_key_strings[sk->sk_family], | |
1439 | af_family_keys + sk->sk_family); | |
a5b5bb9a IM |
1440 | } |
1441 | ||
4dc6dc71 ED |
1442 | /* |
1443 | * Copy all fields from osk to nsk but nsk->sk_refcnt must not change yet, | |
1444 | * even temporarly, because of RCU lookups. sk_node should also be left as is. | |
68835aba | 1445 | * We must not copy fields between sk_dontcopy_begin and sk_dontcopy_end |
4dc6dc71 | 1446 | */ |
f1a6c4da PE |
1447 | static void sock_copy(struct sock *nsk, const struct sock *osk) |
1448 | { | |
1449 | #ifdef CONFIG_SECURITY_NETWORK | |
1450 | void *sptr = nsk->sk_security; | |
1451 | #endif | |
68835aba ED |
1452 | memcpy(nsk, osk, offsetof(struct sock, sk_dontcopy_begin)); |
1453 | ||
1454 | memcpy(&nsk->sk_dontcopy_end, &osk->sk_dontcopy_end, | |
1455 | osk->sk_prot->obj_size - offsetof(struct sock, sk_dontcopy_end)); | |
1456 | ||
f1a6c4da PE |
1457 | #ifdef CONFIG_SECURITY_NETWORK |
1458 | nsk->sk_security = sptr; | |
1459 | security_sk_clone(osk, nsk); | |
1460 | #endif | |
1461 | } | |
1462 | ||
2e4afe7b PE |
1463 | static struct sock *sk_prot_alloc(struct proto *prot, gfp_t priority, |
1464 | int family) | |
c308c1b2 PE |
1465 | { |
1466 | struct sock *sk; | |
1467 | struct kmem_cache *slab; | |
1468 | ||
1469 | slab = prot->slab; | |
e912b114 ED |
1470 | if (slab != NULL) { |
1471 | sk = kmem_cache_alloc(slab, priority & ~__GFP_ZERO); | |
1472 | if (!sk) | |
1473 | return sk; | |
ba2489b0 ED |
1474 | if (priority & __GFP_ZERO) |
1475 | sk_prot_clear_nulls(sk, prot->obj_size); | |
fcbdf09d | 1476 | } else |
c308c1b2 PE |
1477 | sk = kmalloc(prot->obj_size, priority); |
1478 | ||
2e4afe7b PE |
1479 | if (sk != NULL) { |
1480 | if (security_sk_alloc(sk, family, priority)) | |
1481 | goto out_free; | |
1482 | ||
1483 | if (!try_module_get(prot->owner)) | |
1484 | goto out_free_sec; | |
e022f0b4 | 1485 | sk_tx_queue_clear(sk); |
2e4afe7b PE |
1486 | } |
1487 | ||
c308c1b2 | 1488 | return sk; |
2e4afe7b PE |
1489 | |
1490 | out_free_sec: | |
1491 | security_sk_free(sk); | |
1492 | out_free: | |
1493 | if (slab != NULL) | |
1494 | kmem_cache_free(slab, sk); | |
1495 | else | |
1496 | kfree(sk); | |
1497 | return NULL; | |
c308c1b2 PE |
1498 | } |
1499 | ||
1500 | static void sk_prot_free(struct proto *prot, struct sock *sk) | |
1501 | { | |
1502 | struct kmem_cache *slab; | |
2e4afe7b | 1503 | struct module *owner; |
c308c1b2 | 1504 | |
2e4afe7b | 1505 | owner = prot->owner; |
c308c1b2 | 1506 | slab = prot->slab; |
2e4afe7b | 1507 | |
bd1060a1 | 1508 | cgroup_sk_free(&sk->sk_cgrp_data); |
2d758073 | 1509 | mem_cgroup_sk_free(sk); |
2e4afe7b | 1510 | security_sk_free(sk); |
c308c1b2 PE |
1511 | if (slab != NULL) |
1512 | kmem_cache_free(slab, sk); | |
1513 | else | |
1514 | kfree(sk); | |
2e4afe7b | 1515 | module_put(owner); |
c308c1b2 PE |
1516 | } |
1517 | ||
1da177e4 LT |
1518 | /** |
1519 | * sk_alloc - All socket objects are allocated here | |
c4ea43c5 | 1520 | * @net: the applicable net namespace |
4dc3b16b PP |
1521 | * @family: protocol family |
1522 | * @priority: for allocation (%GFP_KERNEL, %GFP_ATOMIC, etc) | |
1523 | * @prot: struct proto associated with this new sock instance | |
11aa9c28 | 1524 | * @kern: is this to be a kernel socket? |
1da177e4 | 1525 | */ |
1b8d7ae4 | 1526 | struct sock *sk_alloc(struct net *net, int family, gfp_t priority, |
11aa9c28 | 1527 | struct proto *prot, int kern) |
1da177e4 | 1528 | { |
c308c1b2 | 1529 | struct sock *sk; |
1da177e4 | 1530 | |
154adbc8 | 1531 | sk = sk_prot_alloc(prot, priority | __GFP_ZERO, family); |
1da177e4 | 1532 | if (sk) { |
154adbc8 PE |
1533 | sk->sk_family = family; |
1534 | /* | |
1535 | * See comment in struct sock definition to understand | |
1536 | * why we need sk_prot_creator -acme | |
1537 | */ | |
1538 | sk->sk_prot = sk->sk_prot_creator = prot; | |
cdfbabfb | 1539 | sk->sk_kern_sock = kern; |
154adbc8 | 1540 | sock_lock_init(sk); |
26abe143 | 1541 | sk->sk_net_refcnt = kern ? 0 : 1; |
648845ab | 1542 | if (likely(sk->sk_net_refcnt)) { |
26abe143 | 1543 | get_net(net); |
648845ab TZ |
1544 | sock_inuse_add(net, 1); |
1545 | } | |
1546 | ||
26abe143 | 1547 | sock_net_set(sk, net); |
14afee4b | 1548 | refcount_set(&sk->sk_wmem_alloc, 1); |
f8451725 | 1549 | |
2d758073 | 1550 | mem_cgroup_sk_alloc(sk); |
d979a39d | 1551 | cgroup_sk_alloc(&sk->sk_cgrp_data); |
2a56a1fe TH |
1552 | sock_update_classid(&sk->sk_cgrp_data); |
1553 | sock_update_netprioidx(&sk->sk_cgrp_data); | |
1da177e4 | 1554 | } |
a79af59e | 1555 | |
2e4afe7b | 1556 | return sk; |
1da177e4 | 1557 | } |
2a91525c | 1558 | EXPORT_SYMBOL(sk_alloc); |
1da177e4 | 1559 | |
a4298e45 ED |
1560 | /* Sockets having SOCK_RCU_FREE will call this function after one RCU |
1561 | * grace period. This is the case for UDP sockets and TCP listeners. | |
1562 | */ | |
1563 | static void __sk_destruct(struct rcu_head *head) | |
1da177e4 | 1564 | { |
a4298e45 | 1565 | struct sock *sk = container_of(head, struct sock, sk_rcu); |
1da177e4 | 1566 | struct sk_filter *filter; |
1da177e4 LT |
1567 | |
1568 | if (sk->sk_destruct) | |
1569 | sk->sk_destruct(sk); | |
1570 | ||
a898def2 | 1571 | filter = rcu_dereference_check(sk->sk_filter, |
14afee4b | 1572 | refcount_read(&sk->sk_wmem_alloc) == 0); |
1da177e4 | 1573 | if (filter) { |
309dd5fc | 1574 | sk_filter_uncharge(sk, filter); |
a9b3cd7f | 1575 | RCU_INIT_POINTER(sk->sk_filter, NULL); |
1da177e4 | 1576 | } |
538950a1 CG |
1577 | if (rcu_access_pointer(sk->sk_reuseport_cb)) |
1578 | reuseport_detach_sock(sk); | |
1da177e4 | 1579 | |
08e29af3 | 1580 | sock_disable_timestamp(sk, SK_FLAGS_TIMESTAMP); |
1da177e4 LT |
1581 | |
1582 | if (atomic_read(&sk->sk_omem_alloc)) | |
e005d193 JP |
1583 | pr_debug("%s: optmem leakage (%d bytes) detected\n", |
1584 | __func__, atomic_read(&sk->sk_omem_alloc)); | |
1da177e4 | 1585 | |
22a0e18e ED |
1586 | if (sk->sk_frag.page) { |
1587 | put_page(sk->sk_frag.page); | |
1588 | sk->sk_frag.page = NULL; | |
1589 | } | |
1590 | ||
109f6e39 EB |
1591 | if (sk->sk_peer_cred) |
1592 | put_cred(sk->sk_peer_cred); | |
1593 | put_pid(sk->sk_peer_pid); | |
26abe143 EB |
1594 | if (likely(sk->sk_net_refcnt)) |
1595 | put_net(sock_net(sk)); | |
c308c1b2 | 1596 | sk_prot_free(sk->sk_prot_creator, sk); |
1da177e4 | 1597 | } |
2b85a34e | 1598 | |
a4298e45 ED |
1599 | void sk_destruct(struct sock *sk) |
1600 | { | |
1601 | if (sock_flag(sk, SOCK_RCU_FREE)) | |
1602 | call_rcu(&sk->sk_rcu, __sk_destruct); | |
1603 | else | |
1604 | __sk_destruct(&sk->sk_rcu); | |
1605 | } | |
1606 | ||
eb4cb008 CG |
1607 | static void __sk_free(struct sock *sk) |
1608 | { | |
648845ab TZ |
1609 | if (likely(sk->sk_net_refcnt)) |
1610 | sock_inuse_add(sock_net(sk), -1); | |
1611 | ||
9709020c | 1612 | if (unlikely(sk->sk_net_refcnt && sock_diag_has_destroy_listeners(sk))) |
eb4cb008 CG |
1613 | sock_diag_broadcast_destroy(sk); |
1614 | else | |
1615 | sk_destruct(sk); | |
1616 | } | |
1617 | ||
2b85a34e ED |
1618 | void sk_free(struct sock *sk) |
1619 | { | |
1620 | /* | |
25985edc | 1621 | * We subtract one from sk_wmem_alloc and can know if |
2b85a34e ED |
1622 | * some packets are still in some tx queue. |
1623 | * If not null, sock_wfree() will call __sk_free(sk) later | |
1624 | */ | |
14afee4b | 1625 | if (refcount_dec_and_test(&sk->sk_wmem_alloc)) |
2b85a34e ED |
1626 | __sk_free(sk); |
1627 | } | |
2a91525c | 1628 | EXPORT_SYMBOL(sk_free); |
1da177e4 | 1629 | |
581319c5 PA |
1630 | static void sk_init_common(struct sock *sk) |
1631 | { | |
1632 | skb_queue_head_init(&sk->sk_receive_queue); | |
1633 | skb_queue_head_init(&sk->sk_write_queue); | |
1634 | skb_queue_head_init(&sk->sk_error_queue); | |
1635 | ||
1636 | rwlock_init(&sk->sk_callback_lock); | |
1637 | lockdep_set_class_and_name(&sk->sk_receive_queue.lock, | |
1638 | af_rlock_keys + sk->sk_family, | |
1639 | af_family_rlock_key_strings[sk->sk_family]); | |
1640 | lockdep_set_class_and_name(&sk->sk_write_queue.lock, | |
1641 | af_wlock_keys + sk->sk_family, | |
1642 | af_family_wlock_key_strings[sk->sk_family]); | |
1643 | lockdep_set_class_and_name(&sk->sk_error_queue.lock, | |
1644 | af_elock_keys + sk->sk_family, | |
1645 | af_family_elock_key_strings[sk->sk_family]); | |
1646 | lockdep_set_class_and_name(&sk->sk_callback_lock, | |
1647 | af_callback_keys + sk->sk_family, | |
1648 | af_family_clock_key_strings[sk->sk_family]); | |
1649 | } | |
1650 | ||
e56c57d0 ED |
1651 | /** |
1652 | * sk_clone_lock - clone a socket, and lock its clone | |
1653 | * @sk: the socket to clone | |
1654 | * @priority: for allocation (%GFP_KERNEL, %GFP_ATOMIC, etc) | |
1655 | * | |
1656 | * Caller must unlock socket even in error path (bh_unlock_sock(newsk)) | |
1657 | */ | |
1658 | struct sock *sk_clone_lock(const struct sock *sk, const gfp_t priority) | |
87d11ceb | 1659 | { |
8fd1d178 | 1660 | struct sock *newsk; |
278571ba | 1661 | bool is_charged = true; |
87d11ceb | 1662 | |
8fd1d178 | 1663 | newsk = sk_prot_alloc(sk->sk_prot, priority, sk->sk_family); |
87d11ceb ACM |
1664 | if (newsk != NULL) { |
1665 | struct sk_filter *filter; | |
1666 | ||
892c141e | 1667 | sock_copy(newsk, sk); |
87d11ceb | 1668 | |
9d538fa6 CP |
1669 | newsk->sk_prot_creator = sk->sk_prot; |
1670 | ||
87d11ceb | 1671 | /* SANITY */ |
8a681736 SV |
1672 | if (likely(newsk->sk_net_refcnt)) |
1673 | get_net(sock_net(newsk)); | |
87d11ceb ACM |
1674 | sk_node_init(&newsk->sk_node); |
1675 | sock_lock_init(newsk); | |
1676 | bh_lock_sock(newsk); | |
fa438ccf | 1677 | newsk->sk_backlog.head = newsk->sk_backlog.tail = NULL; |
8eae939f | 1678 | newsk->sk_backlog.len = 0; |
87d11ceb ACM |
1679 | |
1680 | atomic_set(&newsk->sk_rmem_alloc, 0); | |
2b85a34e ED |
1681 | /* |
1682 | * sk_wmem_alloc set to one (see sk_free() and sock_wfree()) | |
1683 | */ | |
14afee4b | 1684 | refcount_set(&newsk->sk_wmem_alloc, 1); |
87d11ceb | 1685 | atomic_set(&newsk->sk_omem_alloc, 0); |
581319c5 | 1686 | sk_init_common(newsk); |
87d11ceb ACM |
1687 | |
1688 | newsk->sk_dst_cache = NULL; | |
9b8805a3 | 1689 | newsk->sk_dst_pending_confirm = 0; |
87d11ceb ACM |
1690 | newsk->sk_wmem_queued = 0; |
1691 | newsk->sk_forward_alloc = 0; | |
9caad864 | 1692 | atomic_set(&newsk->sk_drops, 0); |
87d11ceb | 1693 | newsk->sk_send_head = NULL; |
87d11ceb | 1694 | newsk->sk_userlocks = sk->sk_userlocks & ~SOCK_BINDPORT_LOCK; |
52267790 | 1695 | atomic_set(&newsk->sk_zckey, 0); |
87d11ceb ACM |
1696 | |
1697 | sock_reset_flag(newsk, SOCK_DONE); | |
edbe69ef | 1698 | mem_cgroup_sk_alloc(newsk); |
c0576e39 | 1699 | cgroup_sk_alloc(&newsk->sk_cgrp_data); |
87d11ceb | 1700 | |
eefca20e ED |
1701 | rcu_read_lock(); |
1702 | filter = rcu_dereference(sk->sk_filter); | |
87d11ceb | 1703 | if (filter != NULL) |
278571ba AS |
1704 | /* though it's an empty new sock, the charging may fail |
1705 | * if sysctl_optmem_max was changed between creation of | |
1706 | * original socket and cloning | |
1707 | */ | |
1708 | is_charged = sk_filter_charge(newsk, filter); | |
eefca20e ED |
1709 | RCU_INIT_POINTER(newsk->sk_filter, filter); |
1710 | rcu_read_unlock(); | |
87d11ceb | 1711 | |
d188ba86 | 1712 | if (unlikely(!is_charged || xfrm_sk_clone_policy(newsk, sk))) { |
a97e50cc DB |
1713 | /* We need to make sure that we don't uncharge the new |
1714 | * socket if we couldn't charge it in the first place | |
1715 | * as otherwise we uncharge the parent's filter. | |
1716 | */ | |
1717 | if (!is_charged) | |
1718 | RCU_INIT_POINTER(newsk->sk_filter, NULL); | |
94352d45 | 1719 | sk_free_unlock_clone(newsk); |
87d11ceb ACM |
1720 | newsk = NULL; |
1721 | goto out; | |
1722 | } | |
fa463497 | 1723 | RCU_INIT_POINTER(newsk->sk_reuseport_cb, NULL); |
87d11ceb ACM |
1724 | |
1725 | newsk->sk_err = 0; | |
e551c32d | 1726 | newsk->sk_err_soft = 0; |
87d11ceb | 1727 | newsk->sk_priority = 0; |
2c8c56e1 | 1728 | newsk->sk_incoming_cpu = raw_smp_processor_id(); |
33cf7c90 | 1729 | atomic64_set(&newsk->sk_cookie, 0); |
648845ab TZ |
1730 | if (likely(newsk->sk_net_refcnt)) |
1731 | sock_inuse_add(sock_net(newsk), 1); | |
d979a39d | 1732 | |
4dc6dc71 ED |
1733 | /* |
1734 | * Before updating sk_refcnt, we must commit prior changes to memory | |
1735 | * (Documentation/RCU/rculist_nulls.txt for details) | |
1736 | */ | |
1737 | smp_wmb(); | |
41c6d650 | 1738 | refcount_set(&newsk->sk_refcnt, 2); |
87d11ceb ACM |
1739 | |
1740 | /* | |
1741 | * Increment the counter in the same struct proto as the master | |
1742 | * sock (sk_refcnt_debug_inc uses newsk->sk_prot->socks, that | |
1743 | * is the same as sk->sk_prot->socks, as this field was copied | |
1744 | * with memcpy). | |
1745 | * | |
1746 | * This _changes_ the previous behaviour, where | |
1747 | * tcp_create_openreq_child always was incrementing the | |
1748 | * equivalent to tcp_prot->socks (inet_sock_nr), so this have | |
1749 | * to be taken into account in all callers. -acme | |
1750 | */ | |
1751 | sk_refcnt_debug_inc(newsk); | |
972692e0 | 1752 | sk_set_socket(newsk, NULL); |
43815482 | 1753 | newsk->sk_wq = NULL; |
87d11ceb ACM |
1754 | |
1755 | if (newsk->sk_prot->sockets_allocated) | |
180d8cd9 | 1756 | sk_sockets_allocated_inc(newsk); |
704da560 | 1757 | |
080a270f HFS |
1758 | if (sock_needs_netstamp(sk) && |
1759 | newsk->sk_flags & SK_FLAGS_TIMESTAMP) | |
704da560 | 1760 | net_enable_timestamp(); |
87d11ceb ACM |
1761 | } |
1762 | out: | |
1763 | return newsk; | |
1764 | } | |
e56c57d0 | 1765 | EXPORT_SYMBOL_GPL(sk_clone_lock); |
87d11ceb | 1766 | |
94352d45 ACM |
1767 | void sk_free_unlock_clone(struct sock *sk) |
1768 | { | |
1769 | /* It is still raw copy of parent, so invalidate | |
1770 | * destructor and make plain sk_free() */ | |
1771 | sk->sk_destruct = NULL; | |
1772 | bh_unlock_sock(sk); | |
1773 | sk_free(sk); | |
1774 | } | |
1775 | EXPORT_SYMBOL_GPL(sk_free_unlock_clone); | |
1776 | ||
9958089a AK |
1777 | void sk_setup_caps(struct sock *sk, struct dst_entry *dst) |
1778 | { | |
d6a4e26a ED |
1779 | u32 max_segs = 1; |
1780 | ||
6bd4f355 | 1781 | sk_dst_set(sk, dst); |
0a6b2a1d | 1782 | sk->sk_route_caps = dst->dev->features | sk->sk_route_forced_caps; |
9958089a | 1783 | if (sk->sk_route_caps & NETIF_F_GSO) |
4fcd6b99 | 1784 | sk->sk_route_caps |= NETIF_F_GSO_SOFTWARE; |
a465419b | 1785 | sk->sk_route_caps &= ~sk->sk_route_nocaps; |
9958089a | 1786 | if (sk_can_gso(sk)) { |
f70f250a | 1787 | if (dst->header_len && !xfrm_dst_offload_ok(dst)) { |
9958089a | 1788 | sk->sk_route_caps &= ~NETIF_F_GSO_MASK; |
82cc1a7a | 1789 | } else { |
9958089a | 1790 | sk->sk_route_caps |= NETIF_F_SG | NETIF_F_HW_CSUM; |
82cc1a7a | 1791 | sk->sk_gso_max_size = dst->dev->gso_max_size; |
d6a4e26a | 1792 | max_segs = max_t(u32, dst->dev->gso_max_segs, 1); |
82cc1a7a | 1793 | } |
9958089a | 1794 | } |
d6a4e26a | 1795 | sk->sk_gso_max_segs = max_segs; |
9958089a AK |
1796 | } |
1797 | EXPORT_SYMBOL_GPL(sk_setup_caps); | |
1798 | ||
1da177e4 LT |
1799 | /* |
1800 | * Simple resource managers for sockets. | |
1801 | */ | |
1802 | ||
1803 | ||
4ec93edb YH |
1804 | /* |
1805 | * Write buffer destructor automatically called from kfree_skb. | |
1da177e4 LT |
1806 | */ |
1807 | void sock_wfree(struct sk_buff *skb) | |
1808 | { | |
1809 | struct sock *sk = skb->sk; | |
d99927f4 | 1810 | unsigned int len = skb->truesize; |
1da177e4 | 1811 | |
d99927f4 ED |
1812 | if (!sock_flag(sk, SOCK_USE_WRITE_QUEUE)) { |
1813 | /* | |
1814 | * Keep a reference on sk_wmem_alloc, this will be released | |
1815 | * after sk_write_space() call | |
1816 | */ | |
14afee4b | 1817 | WARN_ON(refcount_sub_and_test(len - 1, &sk->sk_wmem_alloc)); |
1da177e4 | 1818 | sk->sk_write_space(sk); |
d99927f4 ED |
1819 | len = 1; |
1820 | } | |
2b85a34e | 1821 | /* |
d99927f4 ED |
1822 | * if sk_wmem_alloc reaches 0, we must finish what sk_free() |
1823 | * could not do because of in-flight packets | |
2b85a34e | 1824 | */ |
14afee4b | 1825 | if (refcount_sub_and_test(len, &sk->sk_wmem_alloc)) |
2b85a34e | 1826 | __sk_free(sk); |
1da177e4 | 1827 | } |
2a91525c | 1828 | EXPORT_SYMBOL(sock_wfree); |
1da177e4 | 1829 | |
1d2077ac ED |
1830 | /* This variant of sock_wfree() is used by TCP, |
1831 | * since it sets SOCK_USE_WRITE_QUEUE. | |
1832 | */ | |
1833 | void __sock_wfree(struct sk_buff *skb) | |
1834 | { | |
1835 | struct sock *sk = skb->sk; | |
1836 | ||
14afee4b | 1837 | if (refcount_sub_and_test(skb->truesize, &sk->sk_wmem_alloc)) |
1d2077ac ED |
1838 | __sk_free(sk); |
1839 | } | |
1840 | ||
9e17f8a4 ED |
1841 | void skb_set_owner_w(struct sk_buff *skb, struct sock *sk) |
1842 | { | |
1843 | skb_orphan(skb); | |
1844 | skb->sk = sk; | |
1845 | #ifdef CONFIG_INET | |
1846 | if (unlikely(!sk_fullsock(sk))) { | |
1847 | skb->destructor = sock_edemux; | |
1848 | sock_hold(sk); | |
1849 | return; | |
1850 | } | |
1851 | #endif | |
1852 | skb->destructor = sock_wfree; | |
1853 | skb_set_hash_from_sk(skb, sk); | |
1854 | /* | |
1855 | * We used to take a refcount on sk, but following operation | |
1856 | * is enough to guarantee sk_free() wont free this sock until | |
1857 | * all in-flight packets are completed | |
1858 | */ | |
14afee4b | 1859 | refcount_add(skb->truesize, &sk->sk_wmem_alloc); |
9e17f8a4 ED |
1860 | } |
1861 | EXPORT_SYMBOL(skb_set_owner_w); | |
1862 | ||
1d2077ac ED |
1863 | /* This helper is used by netem, as it can hold packets in its |
1864 | * delay queue. We want to allow the owner socket to send more | |
1865 | * packets, as if they were already TX completed by a typical driver. | |
1866 | * But we also want to keep skb->sk set because some packet schedulers | |
f6ba8d33 | 1867 | * rely on it (sch_fq for example). |
1d2077ac | 1868 | */ |
f2f872f9 ED |
1869 | void skb_orphan_partial(struct sk_buff *skb) |
1870 | { | |
f6ba8d33 | 1871 | if (skb_is_tcp_pure_ack(skb)) |
1d2077ac ED |
1872 | return; |
1873 | ||
f2f872f9 ED |
1874 | if (skb->destructor == sock_wfree |
1875 | #ifdef CONFIG_INET | |
1876 | || skb->destructor == tcp_wfree | |
1877 | #endif | |
1878 | ) { | |
f6ba8d33 ED |
1879 | struct sock *sk = skb->sk; |
1880 | ||
41c6d650 | 1881 | if (refcount_inc_not_zero(&sk->sk_refcnt)) { |
14afee4b | 1882 | WARN_ON(refcount_sub_and_test(skb->truesize, &sk->sk_wmem_alloc)); |
f6ba8d33 ED |
1883 | skb->destructor = sock_efree; |
1884 | } | |
f2f872f9 ED |
1885 | } else { |
1886 | skb_orphan(skb); | |
1887 | } | |
1888 | } | |
1889 | EXPORT_SYMBOL(skb_orphan_partial); | |
1890 | ||
4ec93edb YH |
1891 | /* |
1892 | * Read buffer destructor automatically called from kfree_skb. | |
1da177e4 LT |
1893 | */ |
1894 | void sock_rfree(struct sk_buff *skb) | |
1895 | { | |
1896 | struct sock *sk = skb->sk; | |
d361fd59 | 1897 | unsigned int len = skb->truesize; |
1da177e4 | 1898 | |
d361fd59 ED |
1899 | atomic_sub(len, &sk->sk_rmem_alloc); |
1900 | sk_mem_uncharge(sk, len); | |
1da177e4 | 1901 | } |
2a91525c | 1902 | EXPORT_SYMBOL(sock_rfree); |
1da177e4 | 1903 | |
7768eed8 OH |
1904 | /* |
1905 | * Buffer destructor for skbs that are not used directly in read or write | |
1906 | * path, e.g. for error handler skbs. Automatically called from kfree_skb. | |
1907 | */ | |
62bccb8c AD |
1908 | void sock_efree(struct sk_buff *skb) |
1909 | { | |
1910 | sock_put(skb->sk); | |
1911 | } | |
1912 | EXPORT_SYMBOL(sock_efree); | |
1913 | ||
976d0201 | 1914 | kuid_t sock_i_uid(struct sock *sk) |
1da177e4 | 1915 | { |
976d0201 | 1916 | kuid_t uid; |
1da177e4 | 1917 | |
f064af1e | 1918 | read_lock_bh(&sk->sk_callback_lock); |
976d0201 | 1919 | uid = sk->sk_socket ? SOCK_INODE(sk->sk_socket)->i_uid : GLOBAL_ROOT_UID; |
f064af1e | 1920 | read_unlock_bh(&sk->sk_callback_lock); |
1da177e4 LT |
1921 | return uid; |
1922 | } | |
2a91525c | 1923 | EXPORT_SYMBOL(sock_i_uid); |
1da177e4 LT |
1924 | |
1925 | unsigned long sock_i_ino(struct sock *sk) | |
1926 | { | |
1927 | unsigned long ino; | |
1928 | ||
f064af1e | 1929 | read_lock_bh(&sk->sk_callback_lock); |
1da177e4 | 1930 | ino = sk->sk_socket ? SOCK_INODE(sk->sk_socket)->i_ino : 0; |
f064af1e | 1931 | read_unlock_bh(&sk->sk_callback_lock); |
1da177e4 LT |
1932 | return ino; |
1933 | } | |
2a91525c | 1934 | EXPORT_SYMBOL(sock_i_ino); |
1da177e4 LT |
1935 | |
1936 | /* | |
1937 | * Allocate a skb from the socket's send buffer. | |
1938 | */ | |
86a76caf | 1939 | struct sk_buff *sock_wmalloc(struct sock *sk, unsigned long size, int force, |
dd0fc66f | 1940 | gfp_t priority) |
1da177e4 | 1941 | { |
14afee4b | 1942 | if (force || refcount_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf) { |
2a91525c | 1943 | struct sk_buff *skb = alloc_skb(size, priority); |
1da177e4 LT |
1944 | if (skb) { |
1945 | skb_set_owner_w(skb, sk); | |
1946 | return skb; | |
1947 | } | |
1948 | } | |
1949 | return NULL; | |
1950 | } | |
2a91525c | 1951 | EXPORT_SYMBOL(sock_wmalloc); |
1da177e4 | 1952 | |
98ba0bd5 WB |
1953 | static void sock_ofree(struct sk_buff *skb) |
1954 | { | |
1955 | struct sock *sk = skb->sk; | |
1956 | ||
1957 | atomic_sub(skb->truesize, &sk->sk_omem_alloc); | |
1958 | } | |
1959 | ||
1960 | struct sk_buff *sock_omalloc(struct sock *sk, unsigned long size, | |
1961 | gfp_t priority) | |
1962 | { | |
1963 | struct sk_buff *skb; | |
1964 | ||
1965 | /* small safe race: SKB_TRUESIZE may differ from final skb->truesize */ | |
1966 | if (atomic_read(&sk->sk_omem_alloc) + SKB_TRUESIZE(size) > | |
1967 | sysctl_optmem_max) | |
1968 | return NULL; | |
1969 | ||
1970 | skb = alloc_skb(size, priority); | |
1971 | if (!skb) | |
1972 | return NULL; | |
1973 | ||
1974 | atomic_add(skb->truesize, &sk->sk_omem_alloc); | |
1975 | skb->sk = sk; | |
1976 | skb->destructor = sock_ofree; | |
1977 | return skb; | |
1978 | } | |
1979 | ||
4ec93edb | 1980 | /* |
1da177e4 | 1981 | * Allocate a memory block from the socket's option memory buffer. |
4ec93edb | 1982 | */ |
dd0fc66f | 1983 | void *sock_kmalloc(struct sock *sk, int size, gfp_t priority) |
1da177e4 | 1984 | { |
95c96174 | 1985 | if ((unsigned int)size <= sysctl_optmem_max && |
1da177e4 LT |
1986 | atomic_read(&sk->sk_omem_alloc) + size < sysctl_optmem_max) { |
1987 | void *mem; | |
1988 | /* First do the add, to avoid the race if kmalloc | |
4ec93edb | 1989 | * might sleep. |
1da177e4 LT |
1990 | */ |
1991 | atomic_add(size, &sk->sk_omem_alloc); | |
1992 | mem = kmalloc(size, priority); | |
1993 | if (mem) | |
1994 | return mem; | |
1995 | atomic_sub(size, &sk->sk_omem_alloc); | |
1996 | } | |
1997 | return NULL; | |
1998 | } | |
2a91525c | 1999 | EXPORT_SYMBOL(sock_kmalloc); |
1da177e4 | 2000 | |
79e88659 DB |
2001 | /* Free an option memory block. Note, we actually want the inline |
2002 | * here as this allows gcc to detect the nullify and fold away the | |
2003 | * condition entirely. | |
1da177e4 | 2004 | */ |
79e88659 DB |
2005 | static inline void __sock_kfree_s(struct sock *sk, void *mem, int size, |
2006 | const bool nullify) | |
1da177e4 | 2007 | { |
e53da5fb DM |
2008 | if (WARN_ON_ONCE(!mem)) |
2009 | return; | |
79e88659 DB |
2010 | if (nullify) |
2011 | kzfree(mem); | |
2012 | else | |
2013 | kfree(mem); | |
1da177e4 LT |
2014 | atomic_sub(size, &sk->sk_omem_alloc); |
2015 | } | |
79e88659 DB |
2016 | |
2017 | void sock_kfree_s(struct sock *sk, void *mem, int size) | |
2018 | { | |
2019 | __sock_kfree_s(sk, mem, size, false); | |
2020 | } | |
2a91525c | 2021 | EXPORT_SYMBOL(sock_kfree_s); |
1da177e4 | 2022 | |
79e88659 DB |
2023 | void sock_kzfree_s(struct sock *sk, void *mem, int size) |
2024 | { | |
2025 | __sock_kfree_s(sk, mem, size, true); | |
2026 | } | |
2027 | EXPORT_SYMBOL(sock_kzfree_s); | |
2028 | ||
1da177e4 LT |
2029 | /* It is almost wait_for_tcp_memory minus release_sock/lock_sock. |
2030 | I think, these locks should be removed for datagram sockets. | |
2031 | */ | |
2a91525c | 2032 | static long sock_wait_for_wmem(struct sock *sk, long timeo) |
1da177e4 LT |
2033 | { |
2034 | DEFINE_WAIT(wait); | |
2035 | ||
9cd3e072 | 2036 | sk_clear_bit(SOCKWQ_ASYNC_NOSPACE, sk); |
1da177e4 LT |
2037 | for (;;) { |
2038 | if (!timeo) | |
2039 | break; | |
2040 | if (signal_pending(current)) | |
2041 | break; | |
2042 | set_bit(SOCK_NOSPACE, &sk->sk_socket->flags); | |
aa395145 | 2043 | prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE); |
14afee4b | 2044 | if (refcount_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf) |
1da177e4 LT |
2045 | break; |
2046 | if (sk->sk_shutdown & SEND_SHUTDOWN) | |
2047 | break; | |
2048 | if (sk->sk_err) | |
2049 | break; | |
2050 | timeo = schedule_timeout(timeo); | |
2051 | } | |
aa395145 | 2052 | finish_wait(sk_sleep(sk), &wait); |
1da177e4 LT |
2053 | return timeo; |
2054 | } | |
2055 | ||
2056 | ||
2057 | /* | |
2058 | * Generic send/receive buffer handlers | |
2059 | */ | |
2060 | ||
4cc7f68d HX |
2061 | struct sk_buff *sock_alloc_send_pskb(struct sock *sk, unsigned long header_len, |
2062 | unsigned long data_len, int noblock, | |
28d64271 | 2063 | int *errcode, int max_page_order) |
1da177e4 | 2064 | { |
2e4e4410 | 2065 | struct sk_buff *skb; |
1da177e4 LT |
2066 | long timeo; |
2067 | int err; | |
2068 | ||
1da177e4 | 2069 | timeo = sock_sndtimeo(sk, noblock); |
2e4e4410 | 2070 | for (;;) { |
1da177e4 LT |
2071 | err = sock_error(sk); |
2072 | if (err != 0) | |
2073 | goto failure; | |
2074 | ||
2075 | err = -EPIPE; | |
2076 | if (sk->sk_shutdown & SEND_SHUTDOWN) | |
2077 | goto failure; | |
2078 | ||
2e4e4410 ED |
2079 | if (sk_wmem_alloc_get(sk) < sk->sk_sndbuf) |
2080 | break; | |
28d64271 | 2081 | |
9cd3e072 | 2082 | sk_set_bit(SOCKWQ_ASYNC_NOSPACE, sk); |
2e4e4410 ED |
2083 | set_bit(SOCK_NOSPACE, &sk->sk_socket->flags); |
2084 | err = -EAGAIN; | |
2085 | if (!timeo) | |
1da177e4 | 2086 | goto failure; |
2e4e4410 ED |
2087 | if (signal_pending(current)) |
2088 | goto interrupted; | |
2089 | timeo = sock_wait_for_wmem(sk, timeo); | |
1da177e4 | 2090 | } |
2e4e4410 ED |
2091 | skb = alloc_skb_with_frags(header_len, data_len, max_page_order, |
2092 | errcode, sk->sk_allocation); | |
2093 | if (skb) | |
2094 | skb_set_owner_w(skb, sk); | |
1da177e4 LT |
2095 | return skb; |
2096 | ||
2097 | interrupted: | |
2098 | err = sock_intr_errno(timeo); | |
2099 | failure: | |
2100 | *errcode = err; | |
2101 | return NULL; | |
2102 | } | |
4cc7f68d | 2103 | EXPORT_SYMBOL(sock_alloc_send_pskb); |
1da177e4 | 2104 | |
4ec93edb | 2105 | struct sk_buff *sock_alloc_send_skb(struct sock *sk, unsigned long size, |
1da177e4 LT |
2106 | int noblock, int *errcode) |
2107 | { | |
28d64271 | 2108 | return sock_alloc_send_pskb(sk, size, 0, noblock, errcode, 0); |
1da177e4 | 2109 | } |
2a91525c | 2110 | EXPORT_SYMBOL(sock_alloc_send_skb); |
1da177e4 | 2111 | |
39771b12 WB |
2112 | int __sock_cmsg_send(struct sock *sk, struct msghdr *msg, struct cmsghdr *cmsg, |
2113 | struct sockcm_cookie *sockc) | |
2114 | { | |
3dd17e63 SHY |
2115 | u32 tsflags; |
2116 | ||
39771b12 WB |
2117 | switch (cmsg->cmsg_type) { |
2118 | case SO_MARK: | |
2119 | if (!ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN)) | |
2120 | return -EPERM; | |
2121 | if (cmsg->cmsg_len != CMSG_LEN(sizeof(u32))) | |
2122 | return -EINVAL; | |
2123 | sockc->mark = *(u32 *)CMSG_DATA(cmsg); | |
2124 | break; | |
3dd17e63 SHY |
2125 | case SO_TIMESTAMPING: |
2126 | if (cmsg->cmsg_len != CMSG_LEN(sizeof(u32))) | |
2127 | return -EINVAL; | |
2128 | ||
2129 | tsflags = *(u32 *)CMSG_DATA(cmsg); | |
2130 | if (tsflags & ~SOF_TIMESTAMPING_TX_RECORD_MASK) | |
2131 | return -EINVAL; | |
2132 | ||
2133 | sockc->tsflags &= ~SOF_TIMESTAMPING_TX_RECORD_MASK; | |
2134 | sockc->tsflags |= tsflags; | |
2135 | break; | |
80b14dee RC |
2136 | case SCM_TXTIME: |
2137 | if (!sock_flag(sk, SOCK_TXTIME)) | |
2138 | return -EINVAL; | |
2139 | if (cmsg->cmsg_len != CMSG_LEN(sizeof(u64))) | |
2140 | return -EINVAL; | |
2141 | sockc->transmit_time = get_unaligned((u64 *)CMSG_DATA(cmsg)); | |
2142 | break; | |
779f1ede SHY |
2143 | /* SCM_RIGHTS and SCM_CREDENTIALS are semantically in SOL_UNIX. */ |
2144 | case SCM_RIGHTS: | |
2145 | case SCM_CREDENTIALS: | |
2146 | break; | |
39771b12 WB |
2147 | default: |
2148 | return -EINVAL; | |
2149 | } | |
2150 | return 0; | |
2151 | } | |
2152 | EXPORT_SYMBOL(__sock_cmsg_send); | |
2153 | ||
f28ea365 EJ |
2154 | int sock_cmsg_send(struct sock *sk, struct msghdr *msg, |
2155 | struct sockcm_cookie *sockc) | |
2156 | { | |
2157 | struct cmsghdr *cmsg; | |
39771b12 | 2158 | int ret; |
f28ea365 EJ |
2159 | |
2160 | for_each_cmsghdr(cmsg, msg) { | |
2161 | if (!CMSG_OK(msg, cmsg)) | |
2162 | return -EINVAL; | |
2163 | if (cmsg->cmsg_level != SOL_SOCKET) | |
2164 | continue; | |
39771b12 WB |
2165 | ret = __sock_cmsg_send(sk, msg, cmsg, sockc); |
2166 | if (ret) | |
2167 | return ret; | |
f28ea365 EJ |
2168 | } |
2169 | return 0; | |
2170 | } | |
2171 | EXPORT_SYMBOL(sock_cmsg_send); | |
2172 | ||
06044751 ED |
2173 | static void sk_enter_memory_pressure(struct sock *sk) |
2174 | { | |
2175 | if (!sk->sk_prot->enter_memory_pressure) | |
2176 | return; | |
2177 | ||
2178 | sk->sk_prot->enter_memory_pressure(sk); | |
2179 | } | |
2180 | ||
2181 | static void sk_leave_memory_pressure(struct sock *sk) | |
2182 | { | |
2183 | if (sk->sk_prot->leave_memory_pressure) { | |
2184 | sk->sk_prot->leave_memory_pressure(sk); | |
2185 | } else { | |
2186 | unsigned long *memory_pressure = sk->sk_prot->memory_pressure; | |
2187 | ||
2188 | if (memory_pressure && *memory_pressure) | |
2189 | *memory_pressure = 0; | |
2190 | } | |
2191 | } | |
2192 | ||
5640f768 ED |
2193 | /* On 32bit arches, an skb frag is limited to 2^15 */ |
2194 | #define SKB_FRAG_PAGE_ORDER get_order(32768) | |
2195 | ||
400dfd3a ED |
2196 | /** |
2197 | * skb_page_frag_refill - check that a page_frag contains enough room | |
2198 | * @sz: minimum size of the fragment we want to get | |
2199 | * @pfrag: pointer to page_frag | |
82d5e2b8 | 2200 | * @gfp: priority for memory allocation |
400dfd3a ED |
2201 | * |
2202 | * Note: While this allocator tries to use high order pages, there is | |
2203 | * no guarantee that allocations succeed. Therefore, @sz MUST be | |
2204 | * less or equal than PAGE_SIZE. | |
2205 | */ | |
d9b2938a | 2206 | bool skb_page_frag_refill(unsigned int sz, struct page_frag *pfrag, gfp_t gfp) |
5640f768 | 2207 | { |
5640f768 | 2208 | if (pfrag->page) { |
fe896d18 | 2209 | if (page_ref_count(pfrag->page) == 1) { |
5640f768 ED |
2210 | pfrag->offset = 0; |
2211 | return true; | |
2212 | } | |
400dfd3a | 2213 | if (pfrag->offset + sz <= pfrag->size) |
5640f768 ED |
2214 | return true; |
2215 | put_page(pfrag->page); | |
2216 | } | |
2217 | ||
d9b2938a ED |
2218 | pfrag->offset = 0; |
2219 | if (SKB_FRAG_PAGE_ORDER) { | |
d0164adc MG |
2220 | /* Avoid direct reclaim but allow kswapd to wake */ |
2221 | pfrag->page = alloc_pages((gfp & ~__GFP_DIRECT_RECLAIM) | | |
2222 | __GFP_COMP | __GFP_NOWARN | | |
2223 | __GFP_NORETRY, | |
d9b2938a | 2224 | SKB_FRAG_PAGE_ORDER); |
5640f768 | 2225 | if (likely(pfrag->page)) { |
d9b2938a | 2226 | pfrag->size = PAGE_SIZE << SKB_FRAG_PAGE_ORDER; |
5640f768 ED |
2227 | return true; |
2228 | } | |
d9b2938a ED |
2229 | } |
2230 | pfrag->page = alloc_page(gfp); | |
2231 | if (likely(pfrag->page)) { | |
2232 | pfrag->size = PAGE_SIZE; | |
2233 | return true; | |
2234 | } | |
400dfd3a ED |
2235 | return false; |
2236 | } | |
2237 | EXPORT_SYMBOL(skb_page_frag_refill); | |
2238 | ||
2239 | bool sk_page_frag_refill(struct sock *sk, struct page_frag *pfrag) | |
2240 | { | |
2241 | if (likely(skb_page_frag_refill(32U, pfrag, sk->sk_allocation))) | |
2242 | return true; | |
2243 | ||
5640f768 ED |
2244 | sk_enter_memory_pressure(sk); |
2245 | sk_stream_moderate_sndbuf(sk); | |
2246 | return false; | |
2247 | } | |
2248 | EXPORT_SYMBOL(sk_page_frag_refill); | |
2249 | ||
1da177e4 | 2250 | static void __lock_sock(struct sock *sk) |
f39234d6 NK |
2251 | __releases(&sk->sk_lock.slock) |
2252 | __acquires(&sk->sk_lock.slock) | |
1da177e4 LT |
2253 | { |
2254 | DEFINE_WAIT(wait); | |
2255 | ||
e71a4783 | 2256 | for (;;) { |
1da177e4 LT |
2257 | prepare_to_wait_exclusive(&sk->sk_lock.wq, &wait, |
2258 | TASK_UNINTERRUPTIBLE); | |
2259 | spin_unlock_bh(&sk->sk_lock.slock); | |
2260 | schedule(); | |
2261 | spin_lock_bh(&sk->sk_lock.slock); | |
e71a4783 | 2262 | if (!sock_owned_by_user(sk)) |
1da177e4 LT |
2263 | break; |
2264 | } | |
2265 | finish_wait(&sk->sk_lock.wq, &wait); | |
2266 | } | |
2267 | ||
8873c064 | 2268 | void __release_sock(struct sock *sk) |
f39234d6 NK |
2269 | __releases(&sk->sk_lock.slock) |
2270 | __acquires(&sk->sk_lock.slock) | |
1da177e4 | 2271 | { |
5413d1ba | 2272 | struct sk_buff *skb, *next; |
1da177e4 | 2273 | |
5413d1ba | 2274 | while ((skb = sk->sk_backlog.head) != NULL) { |
1da177e4 | 2275 | sk->sk_backlog.head = sk->sk_backlog.tail = NULL; |
1da177e4 | 2276 | |
5413d1ba | 2277 | spin_unlock_bh(&sk->sk_lock.slock); |
1da177e4 | 2278 | |
5413d1ba ED |
2279 | do { |
2280 | next = skb->next; | |
e4cbb02a | 2281 | prefetch(next); |
7fee226a | 2282 | WARN_ON_ONCE(skb_dst_is_noref(skb)); |
a8305bff | 2283 | skb_mark_not_on_list(skb); |
c57943a1 | 2284 | sk_backlog_rcv(sk, skb); |
1da177e4 | 2285 | |
5413d1ba | 2286 | cond_resched(); |
1da177e4 LT |
2287 | |
2288 | skb = next; | |
2289 | } while (skb != NULL); | |
2290 | ||
5413d1ba ED |
2291 | spin_lock_bh(&sk->sk_lock.slock); |
2292 | } | |
8eae939f ZY |
2293 | |
2294 | /* | |
2295 | * Doing the zeroing here guarantee we can not loop forever | |
2296 | * while a wild producer attempts to flood us. | |
2297 | */ | |
2298 | sk->sk_backlog.len = 0; | |
1da177e4 LT |
2299 | } |
2300 | ||
d41a69f1 ED |
2301 | void __sk_flush_backlog(struct sock *sk) |
2302 | { | |
2303 | spin_lock_bh(&sk->sk_lock.slock); | |
2304 | __release_sock(sk); | |
2305 | spin_unlock_bh(&sk->sk_lock.slock); | |
2306 | } | |
2307 | ||
1da177e4 LT |
2308 | /** |
2309 | * sk_wait_data - wait for data to arrive at sk_receive_queue | |
4dc3b16b PP |
2310 | * @sk: sock to wait on |
2311 | * @timeo: for how long | |
dfbafc99 | 2312 | * @skb: last skb seen on sk_receive_queue |
1da177e4 LT |
2313 | * |
2314 | * Now socket state including sk->sk_err is changed only under lock, | |
2315 | * hence we may omit checks after joining wait queue. | |
2316 | * We check receive queue before schedule() only as optimization; | |
2317 | * it is very likely that release_sock() added new data. | |
2318 | */ | |
dfbafc99 | 2319 | int sk_wait_data(struct sock *sk, long *timeo, const struct sk_buff *skb) |
1da177e4 | 2320 | { |
d9dc8b0f | 2321 | DEFINE_WAIT_FUNC(wait, woken_wake_function); |
1da177e4 | 2322 | int rc; |
1da177e4 | 2323 | |
d9dc8b0f | 2324 | add_wait_queue(sk_sleep(sk), &wait); |
9cd3e072 | 2325 | sk_set_bit(SOCKWQ_ASYNC_WAITDATA, sk); |
d9dc8b0f | 2326 | rc = sk_wait_event(sk, timeo, skb_peek_tail(&sk->sk_receive_queue) != skb, &wait); |
9cd3e072 | 2327 | sk_clear_bit(SOCKWQ_ASYNC_WAITDATA, sk); |
d9dc8b0f | 2328 | remove_wait_queue(sk_sleep(sk), &wait); |
1da177e4 LT |
2329 | return rc; |
2330 | } | |
1da177e4 LT |
2331 | EXPORT_SYMBOL(sk_wait_data); |
2332 | ||
3ab224be | 2333 | /** |
f8c3bf00 | 2334 | * __sk_mem_raise_allocated - increase memory_allocated |
3ab224be HA |
2335 | * @sk: socket |
2336 | * @size: memory size to allocate | |
f8c3bf00 | 2337 | * @amt: pages to allocate |
3ab224be HA |
2338 | * @kind: allocation type |
2339 | * | |
f8c3bf00 | 2340 | * Similar to __sk_mem_schedule(), but does not update sk_forward_alloc |
3ab224be | 2341 | */ |
f8c3bf00 | 2342 | int __sk_mem_raise_allocated(struct sock *sk, int size, int amt, int kind) |
3ab224be HA |
2343 | { |
2344 | struct proto *prot = sk->sk_prot; | |
f8c3bf00 | 2345 | long allocated = sk_memory_allocated_add(sk, amt); |
d6f19938 | 2346 | bool charged = true; |
e805605c | 2347 | |
baac50bb | 2348 | if (mem_cgroup_sockets_enabled && sk->sk_memcg && |
d6f19938 | 2349 | !(charged = mem_cgroup_charge_skmem(sk->sk_memcg, amt))) |
e805605c | 2350 | goto suppress_allocation; |
3ab224be HA |
2351 | |
2352 | /* Under limit. */ | |
e805605c | 2353 | if (allocated <= sk_prot_mem_limits(sk, 0)) { |
180d8cd9 | 2354 | sk_leave_memory_pressure(sk); |
3ab224be HA |
2355 | return 1; |
2356 | } | |
2357 | ||
e805605c JW |
2358 | /* Under pressure. */ |
2359 | if (allocated > sk_prot_mem_limits(sk, 1)) | |
180d8cd9 | 2360 | sk_enter_memory_pressure(sk); |
3ab224be | 2361 | |
e805605c JW |
2362 | /* Over hard limit. */ |
2363 | if (allocated > sk_prot_mem_limits(sk, 2)) | |
3ab224be HA |
2364 | goto suppress_allocation; |
2365 | ||
2366 | /* guarantee minimum buffer size under pressure */ | |
2367 | if (kind == SK_MEM_RECV) { | |
a3dcaf17 | 2368 | if (atomic_read(&sk->sk_rmem_alloc) < sk_get_rmem0(sk, prot)) |
3ab224be | 2369 | return 1; |
180d8cd9 | 2370 | |
3ab224be | 2371 | } else { /* SK_MEM_SEND */ |
a3dcaf17 ED |
2372 | int wmem0 = sk_get_wmem0(sk, prot); |
2373 | ||
3ab224be | 2374 | if (sk->sk_type == SOCK_STREAM) { |
a3dcaf17 | 2375 | if (sk->sk_wmem_queued < wmem0) |
3ab224be | 2376 | return 1; |
a3dcaf17 | 2377 | } else if (refcount_read(&sk->sk_wmem_alloc) < wmem0) { |
3ab224be | 2378 | return 1; |
a3dcaf17 | 2379 | } |
3ab224be HA |
2380 | } |
2381 | ||
180d8cd9 | 2382 | if (sk_has_memory_pressure(sk)) { |
1748376b ED |
2383 | int alloc; |
2384 | ||
180d8cd9 | 2385 | if (!sk_under_memory_pressure(sk)) |
1748376b | 2386 | return 1; |
180d8cd9 GC |
2387 | alloc = sk_sockets_allocated_read_positive(sk); |
2388 | if (sk_prot_mem_limits(sk, 2) > alloc * | |
3ab224be HA |
2389 | sk_mem_pages(sk->sk_wmem_queued + |
2390 | atomic_read(&sk->sk_rmem_alloc) + | |
2391 | sk->sk_forward_alloc)) | |
2392 | return 1; | |
2393 | } | |
2394 | ||
2395 | suppress_allocation: | |
2396 | ||
2397 | if (kind == SK_MEM_SEND && sk->sk_type == SOCK_STREAM) { | |
2398 | sk_stream_moderate_sndbuf(sk); | |
2399 | ||
2400 | /* Fail only if socket is _under_ its sndbuf. | |
2401 | * In this case we cannot block, so that we have to fail. | |
2402 | */ | |
2403 | if (sk->sk_wmem_queued + size >= sk->sk_sndbuf) | |
2404 | return 1; | |
2405 | } | |
2406 | ||
d6f19938 YS |
2407 | if (kind == SK_MEM_SEND || (kind == SK_MEM_RECV && charged)) |
2408 | trace_sock_exceed_buf_limit(sk, prot, allocated, kind); | |
3847ce32 | 2409 | |
0e90b31f | 2410 | sk_memory_allocated_sub(sk, amt); |
180d8cd9 | 2411 | |
baac50bb JW |
2412 | if (mem_cgroup_sockets_enabled && sk->sk_memcg) |
2413 | mem_cgroup_uncharge_skmem(sk->sk_memcg, amt); | |
e805605c | 2414 | |
3ab224be HA |
2415 | return 0; |
2416 | } | |
f8c3bf00 PA |
2417 | EXPORT_SYMBOL(__sk_mem_raise_allocated); |
2418 | ||
2419 | /** | |
2420 | * __sk_mem_schedule - increase sk_forward_alloc and memory_allocated | |
2421 | * @sk: socket | |
2422 | * @size: memory size to allocate | |
2423 | * @kind: allocation type | |
2424 | * | |
2425 | * If kind is SK_MEM_SEND, it means wmem allocation. Otherwise it means | |
2426 | * rmem allocation. This function assumes that protocols which have | |
2427 | * memory_pressure use sk_wmem_queued as write buffer accounting. | |
2428 | */ | |
2429 | int __sk_mem_schedule(struct sock *sk, int size, int kind) | |
2430 | { | |
2431 | int ret, amt = sk_mem_pages(size); | |
2432 | ||
2433 | sk->sk_forward_alloc += amt << SK_MEM_QUANTUM_SHIFT; | |
2434 | ret = __sk_mem_raise_allocated(sk, size, amt, kind); | |
2435 | if (!ret) | |
2436 | sk->sk_forward_alloc -= amt << SK_MEM_QUANTUM_SHIFT; | |
2437 | return ret; | |
2438 | } | |
3ab224be HA |
2439 | EXPORT_SYMBOL(__sk_mem_schedule); |
2440 | ||
2441 | /** | |
f8c3bf00 | 2442 | * __sk_mem_reduce_allocated - reclaim memory_allocated |
3ab224be | 2443 | * @sk: socket |
f8c3bf00 PA |
2444 | * @amount: number of quanta |
2445 | * | |
2446 | * Similar to __sk_mem_reclaim(), but does not update sk_forward_alloc | |
3ab224be | 2447 | */ |
f8c3bf00 | 2448 | void __sk_mem_reduce_allocated(struct sock *sk, int amount) |
3ab224be | 2449 | { |
1a24e04e | 2450 | sk_memory_allocated_sub(sk, amount); |
3ab224be | 2451 | |
baac50bb JW |
2452 | if (mem_cgroup_sockets_enabled && sk->sk_memcg) |
2453 | mem_cgroup_uncharge_skmem(sk->sk_memcg, amount); | |
e805605c | 2454 | |
180d8cd9 GC |
2455 | if (sk_under_memory_pressure(sk) && |
2456 | (sk_memory_allocated(sk) < sk_prot_mem_limits(sk, 0))) | |
2457 | sk_leave_memory_pressure(sk); | |
3ab224be | 2458 | } |
f8c3bf00 PA |
2459 | EXPORT_SYMBOL(__sk_mem_reduce_allocated); |
2460 | ||
2461 | /** | |
2462 | * __sk_mem_reclaim - reclaim sk_forward_alloc and memory_allocated | |
2463 | * @sk: socket | |
2464 | * @amount: number of bytes (rounded down to a SK_MEM_QUANTUM multiple) | |
2465 | */ | |
2466 | void __sk_mem_reclaim(struct sock *sk, int amount) | |
2467 | { | |
2468 | amount >>= SK_MEM_QUANTUM_SHIFT; | |
2469 | sk->sk_forward_alloc -= amount << SK_MEM_QUANTUM_SHIFT; | |
2470 | __sk_mem_reduce_allocated(sk, amount); | |
2471 | } | |
3ab224be HA |
2472 | EXPORT_SYMBOL(__sk_mem_reclaim); |
2473 | ||
627d2d6b | 2474 | int sk_set_peek_off(struct sock *sk, int val) |
2475 | { | |
627d2d6b | 2476 | sk->sk_peek_off = val; |
2477 | return 0; | |
2478 | } | |
2479 | EXPORT_SYMBOL_GPL(sk_set_peek_off); | |
3ab224be | 2480 | |
1da177e4 LT |
2481 | /* |
2482 | * Set of default routines for initialising struct proto_ops when | |
2483 | * the protocol does not support a particular function. In certain | |
2484 | * cases where it makes no sense for a protocol to have a "do nothing" | |
2485 | * function, some default processing is provided. | |
2486 | */ | |
2487 | ||
2488 | int sock_no_bind(struct socket *sock, struct sockaddr *saddr, int len) | |
2489 | { | |
2490 | return -EOPNOTSUPP; | |
2491 | } | |
2a91525c | 2492 | EXPORT_SYMBOL(sock_no_bind); |
1da177e4 | 2493 | |
4ec93edb | 2494 | int sock_no_connect(struct socket *sock, struct sockaddr *saddr, |
1da177e4 LT |
2495 | int len, int flags) |
2496 | { | |
2497 | return -EOPNOTSUPP; | |
2498 | } | |
2a91525c | 2499 | EXPORT_SYMBOL(sock_no_connect); |
1da177e4 LT |
2500 | |
2501 | int sock_no_socketpair(struct socket *sock1, struct socket *sock2) | |
2502 | { | |
2503 | return -EOPNOTSUPP; | |
2504 | } | |
2a91525c | 2505 | EXPORT_SYMBOL(sock_no_socketpair); |
1da177e4 | 2506 | |
cdfbabfb DH |
2507 | int sock_no_accept(struct socket *sock, struct socket *newsock, int flags, |
2508 | bool kern) | |
1da177e4 LT |
2509 | { |
2510 | return -EOPNOTSUPP; | |
2511 | } | |
2a91525c | 2512 | EXPORT_SYMBOL(sock_no_accept); |
1da177e4 | 2513 | |
4ec93edb | 2514 | int sock_no_getname(struct socket *sock, struct sockaddr *saddr, |
9b2c45d4 | 2515 | int peer) |
1da177e4 LT |
2516 | { |
2517 | return -EOPNOTSUPP; | |
2518 | } | |
2a91525c | 2519 | EXPORT_SYMBOL(sock_no_getname); |
1da177e4 | 2520 | |
1da177e4 LT |
2521 | int sock_no_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg) |
2522 | { | |
2523 | return -EOPNOTSUPP; | |
2524 | } | |
2a91525c | 2525 | EXPORT_SYMBOL(sock_no_ioctl); |
1da177e4 LT |
2526 | |
2527 | int sock_no_listen(struct socket *sock, int backlog) | |
2528 | { | |
2529 | return -EOPNOTSUPP; | |
2530 | } | |
2a91525c | 2531 | EXPORT_SYMBOL(sock_no_listen); |
1da177e4 LT |
2532 | |
2533 | int sock_no_shutdown(struct socket *sock, int how) | |
2534 | { | |
2535 | return -EOPNOTSUPP; | |
2536 | } | |
2a91525c | 2537 | EXPORT_SYMBOL(sock_no_shutdown); |
1da177e4 LT |
2538 | |
2539 | int sock_no_setsockopt(struct socket *sock, int level, int optname, | |
b7058842 | 2540 | char __user *optval, unsigned int optlen) |
1da177e4 LT |
2541 | { |
2542 | return -EOPNOTSUPP; | |
2543 | } | |
2a91525c | 2544 | EXPORT_SYMBOL(sock_no_setsockopt); |
1da177e4 LT |
2545 | |
2546 | int sock_no_getsockopt(struct socket *sock, int level, int optname, | |
2547 | char __user *optval, int __user *optlen) | |
2548 | { | |
2549 | return -EOPNOTSUPP; | |
2550 | } | |
2a91525c | 2551 | EXPORT_SYMBOL(sock_no_getsockopt); |
1da177e4 | 2552 | |
1b784140 | 2553 | int sock_no_sendmsg(struct socket *sock, struct msghdr *m, size_t len) |
1da177e4 LT |
2554 | { |
2555 | return -EOPNOTSUPP; | |
2556 | } | |
2a91525c | 2557 | EXPORT_SYMBOL(sock_no_sendmsg); |
1da177e4 | 2558 | |
306b13eb TH |
2559 | int sock_no_sendmsg_locked(struct sock *sk, struct msghdr *m, size_t len) |
2560 | { | |
2561 | return -EOPNOTSUPP; | |
2562 | } | |
2563 | EXPORT_SYMBOL(sock_no_sendmsg_locked); | |
2564 | ||
1b784140 YX |
2565 | int sock_no_recvmsg(struct socket *sock, struct msghdr *m, size_t len, |
2566 | int flags) | |
1da177e4 LT |
2567 | { |
2568 | return -EOPNOTSUPP; | |
2569 | } | |
2a91525c | 2570 | EXPORT_SYMBOL(sock_no_recvmsg); |
1da177e4 LT |
2571 | |
2572 | int sock_no_mmap(struct file *file, struct socket *sock, struct vm_area_struct *vma) | |
2573 | { | |
2574 | /* Mirror missing mmap method error code */ | |
2575 | return -ENODEV; | |
2576 | } | |
2a91525c | 2577 | EXPORT_SYMBOL(sock_no_mmap); |
1da177e4 LT |
2578 | |
2579 | ssize_t sock_no_sendpage(struct socket *sock, struct page *page, int offset, size_t size, int flags) | |
2580 | { | |
2581 | ssize_t res; | |
2582 | struct msghdr msg = {.msg_flags = flags}; | |
2583 | struct kvec iov; | |
2584 | char *kaddr = kmap(page); | |
2585 | iov.iov_base = kaddr + offset; | |
2586 | iov.iov_len = size; | |
2587 | res = kernel_sendmsg(sock, &msg, &iov, 1, size); | |
2588 | kunmap(page); | |
2589 | return res; | |
2590 | } | |
2a91525c | 2591 | EXPORT_SYMBOL(sock_no_sendpage); |
1da177e4 | 2592 | |
306b13eb TH |
2593 | ssize_t sock_no_sendpage_locked(struct sock *sk, struct page *page, |
2594 | int offset, size_t size, int flags) | |
2595 | { | |
2596 | ssize_t res; | |
2597 | struct msghdr msg = {.msg_flags = flags}; | |
2598 | struct kvec iov; | |
2599 | char *kaddr = kmap(page); | |
2600 | ||
2601 | iov.iov_base = kaddr + offset; | |
2602 | iov.iov_len = size; | |
2603 | res = kernel_sendmsg_locked(sk, &msg, &iov, 1, size); | |
2604 | kunmap(page); | |
2605 | return res; | |
2606 | } | |
2607 | EXPORT_SYMBOL(sock_no_sendpage_locked); | |
2608 | ||
1da177e4 LT |
2609 | /* |
2610 | * Default Socket Callbacks | |
2611 | */ | |
2612 | ||
2613 | static void sock_def_wakeup(struct sock *sk) | |
2614 | { | |
43815482 ED |
2615 | struct socket_wq *wq; |
2616 | ||
2617 | rcu_read_lock(); | |
2618 | wq = rcu_dereference(sk->sk_wq); | |
1ce0bf50 | 2619 | if (skwq_has_sleeper(wq)) |
43815482 ED |
2620 | wake_up_interruptible_all(&wq->wait); |
2621 | rcu_read_unlock(); | |
1da177e4 LT |
2622 | } |
2623 | ||
2624 | static void sock_def_error_report(struct sock *sk) | |
2625 | { | |
43815482 ED |
2626 | struct socket_wq *wq; |
2627 | ||
2628 | rcu_read_lock(); | |
2629 | wq = rcu_dereference(sk->sk_wq); | |
1ce0bf50 | 2630 | if (skwq_has_sleeper(wq)) |
a9a08845 | 2631 | wake_up_interruptible_poll(&wq->wait, EPOLLERR); |
8d8ad9d7 | 2632 | sk_wake_async(sk, SOCK_WAKE_IO, POLL_ERR); |
43815482 | 2633 | rcu_read_unlock(); |
1da177e4 LT |
2634 | } |
2635 | ||
676d2369 | 2636 | static void sock_def_readable(struct sock *sk) |
1da177e4 | 2637 | { |
43815482 ED |
2638 | struct socket_wq *wq; |
2639 | ||
2640 | rcu_read_lock(); | |
2641 | wq = rcu_dereference(sk->sk_wq); | |
1ce0bf50 | 2642 | if (skwq_has_sleeper(wq)) |
a9a08845 LT |
2643 | wake_up_interruptible_sync_poll(&wq->wait, EPOLLIN | EPOLLPRI | |
2644 | EPOLLRDNORM | EPOLLRDBAND); | |
8d8ad9d7 | 2645 | sk_wake_async(sk, SOCK_WAKE_WAITD, POLL_IN); |
43815482 | 2646 | rcu_read_unlock(); |
1da177e4 LT |
2647 | } |
2648 | ||
2649 | static void sock_def_write_space(struct sock *sk) | |
2650 | { | |
43815482 ED |
2651 | struct socket_wq *wq; |
2652 | ||
2653 | rcu_read_lock(); | |
1da177e4 LT |
2654 | |
2655 | /* Do not wake up a writer until he can make "significant" | |
2656 | * progress. --DaveM | |
2657 | */ | |
14afee4b | 2658 | if ((refcount_read(&sk->sk_wmem_alloc) << 1) <= sk->sk_sndbuf) { |
43815482 | 2659 | wq = rcu_dereference(sk->sk_wq); |
1ce0bf50 | 2660 | if (skwq_has_sleeper(wq)) |
a9a08845 LT |
2661 | wake_up_interruptible_sync_poll(&wq->wait, EPOLLOUT | |
2662 | EPOLLWRNORM | EPOLLWRBAND); | |
1da177e4 LT |
2663 | |
2664 | /* Should agree with poll, otherwise some programs break */ | |
2665 | if (sock_writeable(sk)) | |
8d8ad9d7 | 2666 | sk_wake_async(sk, SOCK_WAKE_SPACE, POLL_OUT); |
1da177e4 LT |
2667 | } |
2668 | ||
43815482 | 2669 | rcu_read_unlock(); |
1da177e4 LT |
2670 | } |
2671 | ||
2672 | static void sock_def_destruct(struct sock *sk) | |
2673 | { | |
1da177e4 LT |
2674 | } |
2675 | ||
2676 | void sk_send_sigurg(struct sock *sk) | |
2677 | { | |
2678 | if (sk->sk_socket && sk->sk_socket->file) | |
2679 | if (send_sigurg(&sk->sk_socket->file->f_owner)) | |
8d8ad9d7 | 2680 | sk_wake_async(sk, SOCK_WAKE_URG, POLL_PRI); |
1da177e4 | 2681 | } |
2a91525c | 2682 | EXPORT_SYMBOL(sk_send_sigurg); |
1da177e4 LT |
2683 | |
2684 | void sk_reset_timer(struct sock *sk, struct timer_list* timer, | |
2685 | unsigned long expires) | |
2686 | { | |
2687 | if (!mod_timer(timer, expires)) | |
2688 | sock_hold(sk); | |
2689 | } | |
1da177e4 LT |
2690 | EXPORT_SYMBOL(sk_reset_timer); |
2691 | ||
2692 | void sk_stop_timer(struct sock *sk, struct timer_list* timer) | |
2693 | { | |
25cc4ae9 | 2694 | if (del_timer(timer)) |
1da177e4 LT |
2695 | __sock_put(sk); |
2696 | } | |
1da177e4 LT |
2697 | EXPORT_SYMBOL(sk_stop_timer); |
2698 | ||
2699 | void sock_init_data(struct socket *sock, struct sock *sk) | |
2700 | { | |
581319c5 | 2701 | sk_init_common(sk); |
1da177e4 LT |
2702 | sk->sk_send_head = NULL; |
2703 | ||
99767f27 | 2704 | timer_setup(&sk->sk_timer, NULL, 0); |
4ec93edb | 2705 | |
1da177e4 LT |
2706 | sk->sk_allocation = GFP_KERNEL; |
2707 | sk->sk_rcvbuf = sysctl_rmem_default; | |
2708 | sk->sk_sndbuf = sysctl_wmem_default; | |
2709 | sk->sk_state = TCP_CLOSE; | |
972692e0 | 2710 | sk_set_socket(sk, sock); |
1da177e4 LT |
2711 | |
2712 | sock_set_flag(sk, SOCK_ZAPPED); | |
2713 | ||
e71a4783 | 2714 | if (sock) { |
1da177e4 | 2715 | sk->sk_type = sock->type; |
43815482 | 2716 | sk->sk_wq = sock->wq; |
1da177e4 | 2717 | sock->sk = sk; |
86741ec2 LC |
2718 | sk->sk_uid = SOCK_INODE(sock)->i_uid; |
2719 | } else { | |
43815482 | 2720 | sk->sk_wq = NULL; |
86741ec2 LC |
2721 | sk->sk_uid = make_kuid(sock_net(sk)->user_ns, 0); |
2722 | } | |
1da177e4 | 2723 | |
1da177e4 | 2724 | rwlock_init(&sk->sk_callback_lock); |
cdfbabfb DH |
2725 | if (sk->sk_kern_sock) |
2726 | lockdep_set_class_and_name( | |
2727 | &sk->sk_callback_lock, | |
2728 | af_kern_callback_keys + sk->sk_family, | |
2729 | af_family_kern_clock_key_strings[sk->sk_family]); | |
2730 | else | |
2731 | lockdep_set_class_and_name( | |
2732 | &sk->sk_callback_lock, | |
443aef0e PZ |
2733 | af_callback_keys + sk->sk_family, |
2734 | af_family_clock_key_strings[sk->sk_family]); | |
1da177e4 LT |
2735 | |
2736 | sk->sk_state_change = sock_def_wakeup; | |
2737 | sk->sk_data_ready = sock_def_readable; | |
2738 | sk->sk_write_space = sock_def_write_space; | |
2739 | sk->sk_error_report = sock_def_error_report; | |
2740 | sk->sk_destruct = sock_def_destruct; | |
2741 | ||
5640f768 ED |
2742 | sk->sk_frag.page = NULL; |
2743 | sk->sk_frag.offset = 0; | |
ef64a54f | 2744 | sk->sk_peek_off = -1; |
1da177e4 | 2745 | |
109f6e39 EB |
2746 | sk->sk_peer_pid = NULL; |
2747 | sk->sk_peer_cred = NULL; | |
1da177e4 LT |
2748 | sk->sk_write_pending = 0; |
2749 | sk->sk_rcvlowat = 1; | |
2750 | sk->sk_rcvtimeo = MAX_SCHEDULE_TIMEOUT; | |
2751 | sk->sk_sndtimeo = MAX_SCHEDULE_TIMEOUT; | |
2752 | ||
6c7c98ba | 2753 | sk->sk_stamp = SK_DEFAULT_STAMP; |
3a0ed3e9 DD |
2754 | #if BITS_PER_LONG==32 |
2755 | seqlock_init(&sk->sk_stamp_seq); | |
2756 | #endif | |
52267790 | 2757 | atomic_set(&sk->sk_zckey, 0); |
1da177e4 | 2758 | |
e0d1095a | 2759 | #ifdef CONFIG_NET_RX_BUSY_POLL |
06021292 | 2760 | sk->sk_napi_id = 0; |
64b0dc51 | 2761 | sk->sk_ll_usec = sysctl_net_busy_read; |
06021292 ET |
2762 | #endif |
2763 | ||
76a9ebe8 ED |
2764 | sk->sk_max_pacing_rate = ~0UL; |
2765 | sk->sk_pacing_rate = ~0UL; | |
3a9b76fd | 2766 | sk->sk_pacing_shift = 10; |
70da268b | 2767 | sk->sk_incoming_cpu = -1; |
c6345ce7 AN |
2768 | |
2769 | sk_rx_queue_clear(sk); | |
4dc6dc71 ED |
2770 | /* |
2771 | * Before updating sk_refcnt, we must commit prior changes to memory | |
2772 | * (Documentation/RCU/rculist_nulls.txt for details) | |
2773 | */ | |
2774 | smp_wmb(); | |
41c6d650 | 2775 | refcount_set(&sk->sk_refcnt, 1); |
33c732c3 | 2776 | atomic_set(&sk->sk_drops, 0); |
1da177e4 | 2777 | } |
2a91525c | 2778 | EXPORT_SYMBOL(sock_init_data); |
1da177e4 | 2779 | |
b5606c2d | 2780 | void lock_sock_nested(struct sock *sk, int subclass) |
1da177e4 LT |
2781 | { |
2782 | might_sleep(); | |
a5b5bb9a | 2783 | spin_lock_bh(&sk->sk_lock.slock); |
d2e9117c | 2784 | if (sk->sk_lock.owned) |
1da177e4 | 2785 | __lock_sock(sk); |
d2e9117c | 2786 | sk->sk_lock.owned = 1; |
a5b5bb9a IM |
2787 | spin_unlock(&sk->sk_lock.slock); |
2788 | /* | |
2789 | * The sk_lock has mutex_lock() semantics here: | |
2790 | */ | |
fcc70d5f | 2791 | mutex_acquire(&sk->sk_lock.dep_map, subclass, 0, _RET_IP_); |
a5b5bb9a | 2792 | local_bh_enable(); |
1da177e4 | 2793 | } |
fcc70d5f | 2794 | EXPORT_SYMBOL(lock_sock_nested); |
1da177e4 | 2795 | |
b5606c2d | 2796 | void release_sock(struct sock *sk) |
1da177e4 | 2797 | { |
a5b5bb9a | 2798 | spin_lock_bh(&sk->sk_lock.slock); |
1da177e4 LT |
2799 | if (sk->sk_backlog.tail) |
2800 | __release_sock(sk); | |
46d3ceab | 2801 | |
c3f9b018 ED |
2802 | /* Warning : release_cb() might need to release sk ownership, |
2803 | * ie call sock_release_ownership(sk) before us. | |
2804 | */ | |
46d3ceab ED |
2805 | if (sk->sk_prot->release_cb) |
2806 | sk->sk_prot->release_cb(sk); | |
2807 | ||
c3f9b018 | 2808 | sock_release_ownership(sk); |
a5b5bb9a IM |
2809 | if (waitqueue_active(&sk->sk_lock.wq)) |
2810 | wake_up(&sk->sk_lock.wq); | |
2811 | spin_unlock_bh(&sk->sk_lock.slock); | |
1da177e4 LT |
2812 | } |
2813 | EXPORT_SYMBOL(release_sock); | |
2814 | ||
8a74ad60 ED |
2815 | /** |
2816 | * lock_sock_fast - fast version of lock_sock | |
2817 | * @sk: socket | |
2818 | * | |
2819 | * This version should be used for very small section, where process wont block | |
d651983d MCC |
2820 | * return false if fast path is taken: |
2821 | * | |
8a74ad60 | 2822 | * sk_lock.slock locked, owned = 0, BH disabled |
d651983d MCC |
2823 | * |
2824 | * return true if slow path is taken: | |
2825 | * | |
8a74ad60 ED |
2826 | * sk_lock.slock unlocked, owned = 1, BH enabled |
2827 | */ | |
2828 | bool lock_sock_fast(struct sock *sk) | |
2829 | { | |
2830 | might_sleep(); | |
2831 | spin_lock_bh(&sk->sk_lock.slock); | |
2832 | ||
2833 | if (!sk->sk_lock.owned) | |
2834 | /* | |
2835 | * Note : We must disable BH | |
2836 | */ | |
2837 | return false; | |
2838 | ||
2839 | __lock_sock(sk); | |
2840 | sk->sk_lock.owned = 1; | |
2841 | spin_unlock(&sk->sk_lock.slock); | |
2842 | /* | |
2843 | * The sk_lock has mutex_lock() semantics here: | |
2844 | */ | |
2845 | mutex_acquire(&sk->sk_lock.dep_map, 0, 0, _RET_IP_); | |
2846 | local_bh_enable(); | |
2847 | return true; | |
2848 | } | |
2849 | EXPORT_SYMBOL(lock_sock_fast); | |
2850 | ||
1da177e4 | 2851 | int sock_get_timestamp(struct sock *sk, struct timeval __user *userstamp) |
4ec93edb | 2852 | { |
b7aa0bf7 | 2853 | struct timeval tv; |
9dae3497 YS |
2854 | |
2855 | sock_enable_timestamp(sk, SOCK_TIMESTAMP); | |
3a0ed3e9 | 2856 | tv = ktime_to_timeval(sock_read_timestamp(sk)); |
b7aa0bf7 | 2857 | if (tv.tv_sec == -1) |
1da177e4 | 2858 | return -ENOENT; |
b7aa0bf7 | 2859 | if (tv.tv_sec == 0) { |
3a0ed3e9 DD |
2860 | ktime_t kt = ktime_get_real(); |
2861 | sock_write_timestamp(sk, kt); | |
2862 | tv = ktime_to_timeval(kt); | |
b7aa0bf7 ED |
2863 | } |
2864 | return copy_to_user(userstamp, &tv, sizeof(tv)) ? -EFAULT : 0; | |
4ec93edb | 2865 | } |
1da177e4 LT |
2866 | EXPORT_SYMBOL(sock_get_timestamp); |
2867 | ||
ae40eb1e ED |
2868 | int sock_get_timestampns(struct sock *sk, struct timespec __user *userstamp) |
2869 | { | |
2870 | struct timespec ts; | |
9dae3497 YS |
2871 | |
2872 | sock_enable_timestamp(sk, SOCK_TIMESTAMP); | |
3a0ed3e9 | 2873 | ts = ktime_to_timespec(sock_read_timestamp(sk)); |
ae40eb1e ED |
2874 | if (ts.tv_sec == -1) |
2875 | return -ENOENT; | |
2876 | if (ts.tv_sec == 0) { | |
3a0ed3e9 DD |
2877 | ktime_t kt = ktime_get_real(); |
2878 | sock_write_timestamp(sk, kt); | |
ae40eb1e ED |
2879 | ts = ktime_to_timespec(sk->sk_stamp); |
2880 | } | |
2881 | return copy_to_user(userstamp, &ts, sizeof(ts)) ? -EFAULT : 0; | |
2882 | } | |
2883 | EXPORT_SYMBOL(sock_get_timestampns); | |
2884 | ||
20d49473 | 2885 | void sock_enable_timestamp(struct sock *sk, int flag) |
4ec93edb | 2886 | { |
20d49473 | 2887 | if (!sock_flag(sk, flag)) { |
08e29af3 ED |
2888 | unsigned long previous_flags = sk->sk_flags; |
2889 | ||
20d49473 PO |
2890 | sock_set_flag(sk, flag); |
2891 | /* | |
2892 | * we just set one of the two flags which require net | |
2893 | * time stamping, but time stamping might have been on | |
2894 | * already because of the other one | |
2895 | */ | |
080a270f HFS |
2896 | if (sock_needs_netstamp(sk) && |
2897 | !(previous_flags & SK_FLAGS_TIMESTAMP)) | |
20d49473 | 2898 | net_enable_timestamp(); |
1da177e4 LT |
2899 | } |
2900 | } | |
1da177e4 | 2901 | |
cb820f8e RC |
2902 | int sock_recv_errqueue(struct sock *sk, struct msghdr *msg, int len, |
2903 | int level, int type) | |
2904 | { | |
2905 | struct sock_exterr_skb *serr; | |
364a9e93 | 2906 | struct sk_buff *skb; |
cb820f8e RC |
2907 | int copied, err; |
2908 | ||
2909 | err = -EAGAIN; | |
364a9e93 | 2910 | skb = sock_dequeue_err_skb(sk); |
cb820f8e RC |
2911 | if (skb == NULL) |
2912 | goto out; | |
2913 | ||
2914 | copied = skb->len; | |
2915 | if (copied > len) { | |
2916 | msg->msg_flags |= MSG_TRUNC; | |
2917 | copied = len; | |
2918 | } | |
51f3d02b | 2919 | err = skb_copy_datagram_msg(skb, 0, msg, copied); |
cb820f8e RC |
2920 | if (err) |
2921 | goto out_free_skb; | |
2922 | ||
2923 | sock_recv_timestamp(msg, sk, skb); | |
2924 | ||
2925 | serr = SKB_EXT_ERR(skb); | |
2926 | put_cmsg(msg, level, type, sizeof(serr->ee), &serr->ee); | |
2927 | ||
2928 | msg->msg_flags |= MSG_ERRQUEUE; | |
2929 | err = copied; | |
2930 | ||
cb820f8e RC |
2931 | out_free_skb: |
2932 | kfree_skb(skb); | |
2933 | out: | |
2934 | return err; | |
2935 | } | |
2936 | EXPORT_SYMBOL(sock_recv_errqueue); | |
2937 | ||
1da177e4 LT |
2938 | /* |
2939 | * Get a socket option on an socket. | |
2940 | * | |
2941 | * FIX: POSIX 1003.1g is very ambiguous here. It states that | |
2942 | * asynchronous errors should be reported by getsockopt. We assume | |
2943 | * this means if you specify SO_ERROR (otherwise whats the point of it). | |
2944 | */ | |
2945 | int sock_common_getsockopt(struct socket *sock, int level, int optname, | |
2946 | char __user *optval, int __user *optlen) | |
2947 | { | |
2948 | struct sock *sk = sock->sk; | |
2949 | ||
2950 | return sk->sk_prot->getsockopt(sk, level, optname, optval, optlen); | |
2951 | } | |
1da177e4 LT |
2952 | EXPORT_SYMBOL(sock_common_getsockopt); |
2953 | ||
3fdadf7d | 2954 | #ifdef CONFIG_COMPAT |
543d9cfe ACM |
2955 | int compat_sock_common_getsockopt(struct socket *sock, int level, int optname, |
2956 | char __user *optval, int __user *optlen) | |
3fdadf7d DM |
2957 | { |
2958 | struct sock *sk = sock->sk; | |
2959 | ||
1e51f951 | 2960 | if (sk->sk_prot->compat_getsockopt != NULL) |
543d9cfe ACM |
2961 | return sk->sk_prot->compat_getsockopt(sk, level, optname, |
2962 | optval, optlen); | |
3fdadf7d DM |
2963 | return sk->sk_prot->getsockopt(sk, level, optname, optval, optlen); |
2964 | } | |
2965 | EXPORT_SYMBOL(compat_sock_common_getsockopt); | |
2966 | #endif | |
2967 | ||
1b784140 YX |
2968 | int sock_common_recvmsg(struct socket *sock, struct msghdr *msg, size_t size, |
2969 | int flags) | |
1da177e4 LT |
2970 | { |
2971 | struct sock *sk = sock->sk; | |
2972 | int addr_len = 0; | |
2973 | int err; | |
2974 | ||
1b784140 | 2975 | err = sk->sk_prot->recvmsg(sk, msg, size, flags & MSG_DONTWAIT, |
1da177e4 LT |
2976 | flags & ~MSG_DONTWAIT, &addr_len); |
2977 | if (err >= 0) | |
2978 | msg->msg_namelen = addr_len; | |
2979 | return err; | |
2980 | } | |
1da177e4 LT |
2981 | EXPORT_SYMBOL(sock_common_recvmsg); |
2982 | ||
2983 | /* | |
2984 | * Set socket options on an inet socket. | |
2985 | */ | |
2986 | int sock_common_setsockopt(struct socket *sock, int level, int optname, | |
b7058842 | 2987 | char __user *optval, unsigned int optlen) |
1da177e4 LT |
2988 | { |
2989 | struct sock *sk = sock->sk; | |
2990 | ||
2991 | return sk->sk_prot->setsockopt(sk, level, optname, optval, optlen); | |
2992 | } | |
1da177e4 LT |
2993 | EXPORT_SYMBOL(sock_common_setsockopt); |
2994 | ||
3fdadf7d | 2995 | #ifdef CONFIG_COMPAT |
543d9cfe | 2996 | int compat_sock_common_setsockopt(struct socket *sock, int level, int optname, |
b7058842 | 2997 | char __user *optval, unsigned int optlen) |
3fdadf7d DM |
2998 | { |
2999 | struct sock *sk = sock->sk; | |
3000 | ||
543d9cfe ACM |
3001 | if (sk->sk_prot->compat_setsockopt != NULL) |
3002 | return sk->sk_prot->compat_setsockopt(sk, level, optname, | |
3003 | optval, optlen); | |
3fdadf7d DM |
3004 | return sk->sk_prot->setsockopt(sk, level, optname, optval, optlen); |
3005 | } | |
3006 | EXPORT_SYMBOL(compat_sock_common_setsockopt); | |
3007 | #endif | |
3008 | ||
1da177e4 LT |
3009 | void sk_common_release(struct sock *sk) |
3010 | { | |
3011 | if (sk->sk_prot->destroy) | |
3012 | sk->sk_prot->destroy(sk); | |
3013 | ||
3014 | /* | |
3015 | * Observation: when sock_common_release is called, processes have | |
3016 | * no access to socket. But net still has. | |
3017 | * Step one, detach it from networking: | |
3018 | * | |
3019 | * A. Remove from hash tables. | |
3020 | */ | |
3021 | ||
3022 | sk->sk_prot->unhash(sk); | |
3023 | ||
3024 | /* | |
3025 | * In this point socket cannot receive new packets, but it is possible | |
3026 | * that some packets are in flight because some CPU runs receiver and | |
3027 | * did hash table lookup before we unhashed socket. They will achieve | |
3028 | * receive queue and will be purged by socket destructor. | |
3029 | * | |
3030 | * Also we still have packets pending on receive queue and probably, | |
3031 | * our own packets waiting in device queues. sock_destroy will drain | |
3032 | * receive queue, but transmitted packets will delay socket destruction | |
3033 | * until the last reference will be released. | |
3034 | */ | |
3035 | ||
3036 | sock_orphan(sk); | |
3037 | ||
3038 | xfrm_sk_free_policy(sk); | |
3039 | ||
e6848976 | 3040 | sk_refcnt_debug_release(sk); |
5640f768 | 3041 | |
1da177e4 LT |
3042 | sock_put(sk); |
3043 | } | |
1da177e4 LT |
3044 | EXPORT_SYMBOL(sk_common_release); |
3045 | ||
a2d133b1 JH |
3046 | void sk_get_meminfo(const struct sock *sk, u32 *mem) |
3047 | { | |
3048 | memset(mem, 0, sizeof(*mem) * SK_MEMINFO_VARS); | |
3049 | ||
3050 | mem[SK_MEMINFO_RMEM_ALLOC] = sk_rmem_alloc_get(sk); | |
3051 | mem[SK_MEMINFO_RCVBUF] = sk->sk_rcvbuf; | |
3052 | mem[SK_MEMINFO_WMEM_ALLOC] = sk_wmem_alloc_get(sk); | |
3053 | mem[SK_MEMINFO_SNDBUF] = sk->sk_sndbuf; | |
3054 | mem[SK_MEMINFO_FWD_ALLOC] = sk->sk_forward_alloc; | |
3055 | mem[SK_MEMINFO_WMEM_QUEUED] = sk->sk_wmem_queued; | |
3056 | mem[SK_MEMINFO_OPTMEM] = atomic_read(&sk->sk_omem_alloc); | |
3057 | mem[SK_MEMINFO_BACKLOG] = sk->sk_backlog.len; | |
3058 | mem[SK_MEMINFO_DROPS] = atomic_read(&sk->sk_drops); | |
3059 | } | |
3060 | ||
13ff3d6f PE |
3061 | #ifdef CONFIG_PROC_FS |
3062 | #define PROTO_INUSE_NR 64 /* should be enough for the first time */ | |
1338d466 PE |
3063 | struct prot_inuse { |
3064 | int val[PROTO_INUSE_NR]; | |
3065 | }; | |
13ff3d6f PE |
3066 | |
3067 | static DECLARE_BITMAP(proto_inuse_idx, PROTO_INUSE_NR); | |
70ee1159 | 3068 | |
70ee1159 PE |
3069 | void sock_prot_inuse_add(struct net *net, struct proto *prot, int val) |
3070 | { | |
08fc7f81 | 3071 | __this_cpu_add(net->core.prot_inuse->val[prot->inuse_idx], val); |
70ee1159 PE |
3072 | } |
3073 | EXPORT_SYMBOL_GPL(sock_prot_inuse_add); | |
3074 | ||
3075 | int sock_prot_inuse_get(struct net *net, struct proto *prot) | |
3076 | { | |
3077 | int cpu, idx = prot->inuse_idx; | |
3078 | int res = 0; | |
3079 | ||
3080 | for_each_possible_cpu(cpu) | |
08fc7f81 | 3081 | res += per_cpu_ptr(net->core.prot_inuse, cpu)->val[idx]; |
70ee1159 PE |
3082 | |
3083 | return res >= 0 ? res : 0; | |
3084 | } | |
3085 | EXPORT_SYMBOL_GPL(sock_prot_inuse_get); | |
3086 | ||
648845ab TZ |
3087 | static void sock_inuse_add(struct net *net, int val) |
3088 | { | |
3089 | this_cpu_add(*net->core.sock_inuse, val); | |
3090 | } | |
3091 | ||
3092 | int sock_inuse_get(struct net *net) | |
3093 | { | |
3094 | int cpu, res = 0; | |
3095 | ||
3096 | for_each_possible_cpu(cpu) | |
3097 | res += *per_cpu_ptr(net->core.sock_inuse, cpu); | |
3098 | ||
3099 | return res; | |
3100 | } | |
3101 | ||
3102 | EXPORT_SYMBOL_GPL(sock_inuse_get); | |
3103 | ||
2c8c1e72 | 3104 | static int __net_init sock_inuse_init_net(struct net *net) |
70ee1159 | 3105 | { |
08fc7f81 | 3106 | net->core.prot_inuse = alloc_percpu(struct prot_inuse); |
648845ab TZ |
3107 | if (net->core.prot_inuse == NULL) |
3108 | return -ENOMEM; | |
3109 | ||
3110 | net->core.sock_inuse = alloc_percpu(int); | |
3111 | if (net->core.sock_inuse == NULL) | |
3112 | goto out; | |
3113 | ||
3114 | return 0; | |
3115 | ||
3116 | out: | |
3117 | free_percpu(net->core.prot_inuse); | |
3118 | return -ENOMEM; | |
70ee1159 PE |
3119 | } |
3120 | ||
2c8c1e72 | 3121 | static void __net_exit sock_inuse_exit_net(struct net *net) |
70ee1159 | 3122 | { |
08fc7f81 | 3123 | free_percpu(net->core.prot_inuse); |
648845ab | 3124 | free_percpu(net->core.sock_inuse); |
70ee1159 PE |
3125 | } |
3126 | ||
3127 | static struct pernet_operations net_inuse_ops = { | |
3128 | .init = sock_inuse_init_net, | |
3129 | .exit = sock_inuse_exit_net, | |
3130 | }; | |
3131 | ||
3132 | static __init int net_inuse_init(void) | |
3133 | { | |
3134 | if (register_pernet_subsys(&net_inuse_ops)) | |
3135 | panic("Cannot initialize net inuse counters"); | |
3136 | ||
3137 | return 0; | |
3138 | } | |
3139 | ||
3140 | core_initcall(net_inuse_init); | |
13ff3d6f PE |
3141 | |
3142 | static void assign_proto_idx(struct proto *prot) | |
3143 | { | |
3144 | prot->inuse_idx = find_first_zero_bit(proto_inuse_idx, PROTO_INUSE_NR); | |
3145 | ||
3146 | if (unlikely(prot->inuse_idx == PROTO_INUSE_NR - 1)) { | |
e005d193 | 3147 | pr_err("PROTO_INUSE_NR exhausted\n"); |
13ff3d6f PE |
3148 | return; |
3149 | } | |
3150 | ||
3151 | set_bit(prot->inuse_idx, proto_inuse_idx); | |
3152 | } | |
3153 | ||
3154 | static void release_proto_idx(struct proto *prot) | |
3155 | { | |
3156 | if (prot->inuse_idx != PROTO_INUSE_NR - 1) | |
3157 | clear_bit(prot->inuse_idx, proto_inuse_idx); | |
3158 | } | |
3159 | #else | |
3160 | static inline void assign_proto_idx(struct proto *prot) | |
3161 | { | |
3162 | } | |
3163 | ||
3164 | static inline void release_proto_idx(struct proto *prot) | |
3165 | { | |
3166 | } | |
648845ab TZ |
3167 | |
3168 | static void sock_inuse_add(struct net *net, int val) | |
3169 | { | |
3170 | } | |
13ff3d6f PE |
3171 | #endif |
3172 | ||
0159dfd3 ED |
3173 | static void req_prot_cleanup(struct request_sock_ops *rsk_prot) |
3174 | { | |
3175 | if (!rsk_prot) | |
3176 | return; | |
3177 | kfree(rsk_prot->slab_name); | |
3178 | rsk_prot->slab_name = NULL; | |
adf78eda JL |
3179 | kmem_cache_destroy(rsk_prot->slab); |
3180 | rsk_prot->slab = NULL; | |
0159dfd3 ED |
3181 | } |
3182 | ||
3183 | static int req_prot_init(const struct proto *prot) | |
3184 | { | |
3185 | struct request_sock_ops *rsk_prot = prot->rsk_prot; | |
3186 | ||
3187 | if (!rsk_prot) | |
3188 | return 0; | |
3189 | ||
3190 | rsk_prot->slab_name = kasprintf(GFP_KERNEL, "request_sock_%s", | |
3191 | prot->name); | |
3192 | if (!rsk_prot->slab_name) | |
3193 | return -ENOMEM; | |
3194 | ||
3195 | rsk_prot->slab = kmem_cache_create(rsk_prot->slab_name, | |
3196 | rsk_prot->obj_size, 0, | |
e699e2c6 SB |
3197 | SLAB_ACCOUNT | prot->slab_flags, |
3198 | NULL); | |
0159dfd3 ED |
3199 | |
3200 | if (!rsk_prot->slab) { | |
3201 | pr_crit("%s: Can't create request sock SLAB cache!\n", | |
3202 | prot->name); | |
3203 | return -ENOMEM; | |
3204 | } | |
3205 | return 0; | |
3206 | } | |
3207 | ||
b733c007 PE |
3208 | int proto_register(struct proto *prot, int alloc_slab) |
3209 | { | |
1da177e4 | 3210 | if (alloc_slab) { |
30c2c9f1 DW |
3211 | prot->slab = kmem_cache_create_usercopy(prot->name, |
3212 | prot->obj_size, 0, | |
e699e2c6 SB |
3213 | SLAB_HWCACHE_ALIGN | SLAB_ACCOUNT | |
3214 | prot->slab_flags, | |
289a4860 | 3215 | prot->useroffset, prot->usersize, |
271b72c7 | 3216 | NULL); |
1da177e4 LT |
3217 | |
3218 | if (prot->slab == NULL) { | |
e005d193 JP |
3219 | pr_crit("%s: Can't create sock SLAB cache!\n", |
3220 | prot->name); | |
60e7663d | 3221 | goto out; |
1da177e4 | 3222 | } |
2e6599cb | 3223 | |
0159dfd3 ED |
3224 | if (req_prot_init(prot)) |
3225 | goto out_free_request_sock_slab; | |
8feaf0c0 | 3226 | |
6d6ee43e | 3227 | if (prot->twsk_prot != NULL) { |
faf23422 | 3228 | prot->twsk_prot->twsk_slab_name = kasprintf(GFP_KERNEL, "tw_sock_%s", prot->name); |
8feaf0c0 | 3229 | |
7e56b5d6 | 3230 | if (prot->twsk_prot->twsk_slab_name == NULL) |
8feaf0c0 ACM |
3231 | goto out_free_request_sock_slab; |
3232 | ||
6d6ee43e | 3233 | prot->twsk_prot->twsk_slab = |
7e56b5d6 | 3234 | kmem_cache_create(prot->twsk_prot->twsk_slab_name, |
6d6ee43e | 3235 | prot->twsk_prot->twsk_obj_size, |
3ab5aee7 | 3236 | 0, |
e699e2c6 | 3237 | SLAB_ACCOUNT | |
52db70dc | 3238 | prot->slab_flags, |
20c2df83 | 3239 | NULL); |
6d6ee43e | 3240 | if (prot->twsk_prot->twsk_slab == NULL) |
8feaf0c0 ACM |
3241 | goto out_free_timewait_sock_slab_name; |
3242 | } | |
1da177e4 LT |
3243 | } |
3244 | ||
36b77a52 | 3245 | mutex_lock(&proto_list_mutex); |
1da177e4 | 3246 | list_add(&prot->node, &proto_list); |
13ff3d6f | 3247 | assign_proto_idx(prot); |
36b77a52 | 3248 | mutex_unlock(&proto_list_mutex); |
b733c007 PE |
3249 | return 0; |
3250 | ||
8feaf0c0 | 3251 | out_free_timewait_sock_slab_name: |
7e56b5d6 | 3252 | kfree(prot->twsk_prot->twsk_slab_name); |
8feaf0c0 | 3253 | out_free_request_sock_slab: |
0159dfd3 ED |
3254 | req_prot_cleanup(prot->rsk_prot); |
3255 | ||
2e6599cb ACM |
3256 | kmem_cache_destroy(prot->slab); |
3257 | prot->slab = NULL; | |
b733c007 PE |
3258 | out: |
3259 | return -ENOBUFS; | |
1da177e4 | 3260 | } |
1da177e4 LT |
3261 | EXPORT_SYMBOL(proto_register); |
3262 | ||
3263 | void proto_unregister(struct proto *prot) | |
3264 | { | |
36b77a52 | 3265 | mutex_lock(&proto_list_mutex); |
13ff3d6f | 3266 | release_proto_idx(prot); |
0a3f4358 | 3267 | list_del(&prot->node); |
36b77a52 | 3268 | mutex_unlock(&proto_list_mutex); |
1da177e4 | 3269 | |
adf78eda JL |
3270 | kmem_cache_destroy(prot->slab); |
3271 | prot->slab = NULL; | |
1da177e4 | 3272 | |
0159dfd3 | 3273 | req_prot_cleanup(prot->rsk_prot); |
2e6599cb | 3274 | |
6d6ee43e | 3275 | if (prot->twsk_prot != NULL && prot->twsk_prot->twsk_slab != NULL) { |
6d6ee43e | 3276 | kmem_cache_destroy(prot->twsk_prot->twsk_slab); |
7e56b5d6 | 3277 | kfree(prot->twsk_prot->twsk_slab_name); |
6d6ee43e | 3278 | prot->twsk_prot->twsk_slab = NULL; |
8feaf0c0 | 3279 | } |
1da177e4 | 3280 | } |
1da177e4 LT |
3281 | EXPORT_SYMBOL(proto_unregister); |
3282 | ||
bf2ae2e4 XL |
3283 | int sock_load_diag_module(int family, int protocol) |
3284 | { | |
3285 | if (!protocol) { | |
3286 | if (!sock_is_registered(family)) | |
3287 | return -ENOENT; | |
3288 | ||
3289 | return request_module("net-pf-%d-proto-%d-type-%d", PF_NETLINK, | |
3290 | NETLINK_SOCK_DIAG, family); | |
3291 | } | |
3292 | ||
3293 | #ifdef CONFIG_INET | |
3294 | if (family == AF_INET && | |
c34c1287 | 3295 | protocol != IPPROTO_RAW && |
bf2ae2e4 XL |
3296 | !rcu_access_pointer(inet_protos[protocol])) |
3297 | return -ENOENT; | |
3298 | #endif | |
3299 | ||
3300 | return request_module("net-pf-%d-proto-%d-type-%d-%d", PF_NETLINK, | |
3301 | NETLINK_SOCK_DIAG, family, protocol); | |
3302 | } | |
3303 | EXPORT_SYMBOL(sock_load_diag_module); | |
3304 | ||
1da177e4 | 3305 | #ifdef CONFIG_PROC_FS |
1da177e4 | 3306 | static void *proto_seq_start(struct seq_file *seq, loff_t *pos) |
36b77a52 | 3307 | __acquires(proto_list_mutex) |
1da177e4 | 3308 | { |
36b77a52 | 3309 | mutex_lock(&proto_list_mutex); |
60f0438a | 3310 | return seq_list_start_head(&proto_list, *pos); |
1da177e4 LT |
3311 | } |
3312 | ||
3313 | static void *proto_seq_next(struct seq_file *seq, void *v, loff_t *pos) | |
3314 | { | |
60f0438a | 3315 | return seq_list_next(v, &proto_list, pos); |
1da177e4 LT |
3316 | } |
3317 | ||
3318 | static void proto_seq_stop(struct seq_file *seq, void *v) | |
36b77a52 | 3319 | __releases(proto_list_mutex) |
1da177e4 | 3320 | { |
36b77a52 | 3321 | mutex_unlock(&proto_list_mutex); |
1da177e4 LT |
3322 | } |
3323 | ||
3324 | static char proto_method_implemented(const void *method) | |
3325 | { | |
3326 | return method == NULL ? 'n' : 'y'; | |
3327 | } | |
180d8cd9 GC |
3328 | static long sock_prot_memory_allocated(struct proto *proto) |
3329 | { | |
cb75a36c | 3330 | return proto->memory_allocated != NULL ? proto_memory_allocated(proto) : -1L; |
180d8cd9 GC |
3331 | } |
3332 | ||
3333 | static char *sock_prot_memory_pressure(struct proto *proto) | |
3334 | { | |
3335 | return proto->memory_pressure != NULL ? | |
3336 | proto_memory_pressure(proto) ? "yes" : "no" : "NI"; | |
3337 | } | |
1da177e4 LT |
3338 | |
3339 | static void proto_seq_printf(struct seq_file *seq, struct proto *proto) | |
3340 | { | |
180d8cd9 | 3341 | |
8d987e5c | 3342 | seq_printf(seq, "%-9s %4u %6d %6ld %-3s %6u %-3s %-10s " |
1da177e4 LT |
3343 | "%2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c\n", |
3344 | proto->name, | |
3345 | proto->obj_size, | |
14e943db | 3346 | sock_prot_inuse_get(seq_file_net(seq), proto), |
180d8cd9 GC |
3347 | sock_prot_memory_allocated(proto), |
3348 | sock_prot_memory_pressure(proto), | |
1da177e4 LT |
3349 | proto->max_header, |
3350 | proto->slab == NULL ? "no" : "yes", | |
3351 | module_name(proto->owner), | |
3352 | proto_method_implemented(proto->close), | |
3353 | proto_method_implemented(proto->connect), | |
3354 | proto_method_implemented(proto->disconnect), | |
3355 | proto_method_implemented(proto->accept), | |
3356 | proto_method_implemented(proto->ioctl), | |
3357 | proto_method_implemented(proto->init), | |
3358 | proto_method_implemented(proto->destroy), | |
3359 | proto_method_implemented(proto->shutdown), | |
3360 | proto_method_implemented(proto->setsockopt), | |
3361 | proto_method_implemented(proto->getsockopt), | |
3362 | proto_method_implemented(proto->sendmsg), | |
3363 | proto_method_implemented(proto->recvmsg), | |
3364 | proto_method_implemented(proto->sendpage), | |
3365 | proto_method_implemented(proto->bind), | |
3366 | proto_method_implemented(proto->backlog_rcv), | |
3367 | proto_method_implemented(proto->hash), | |
3368 | proto_method_implemented(proto->unhash), | |
3369 | proto_method_implemented(proto->get_port), | |
3370 | proto_method_implemented(proto->enter_memory_pressure)); | |
3371 | } | |
3372 | ||
3373 | static int proto_seq_show(struct seq_file *seq, void *v) | |
3374 | { | |
60f0438a | 3375 | if (v == &proto_list) |
1da177e4 LT |
3376 | seq_printf(seq, "%-9s %-4s %-8s %-6s %-5s %-7s %-4s %-10s %s", |
3377 | "protocol", | |
3378 | "size", | |
3379 | "sockets", | |
3380 | "memory", | |
3381 | "press", | |
3382 | "maxhdr", | |
3383 | "slab", | |
3384 | "module", | |
3385 | "cl co di ac io in de sh ss gs se re sp bi br ha uh gp em\n"); | |
3386 | else | |
60f0438a | 3387 | proto_seq_printf(seq, list_entry(v, struct proto, node)); |
1da177e4 LT |
3388 | return 0; |
3389 | } | |
3390 | ||
f690808e | 3391 | static const struct seq_operations proto_seq_ops = { |
1da177e4 LT |
3392 | .start = proto_seq_start, |
3393 | .next = proto_seq_next, | |
3394 | .stop = proto_seq_stop, | |
3395 | .show = proto_seq_show, | |
3396 | }; | |
3397 | ||
14e943db ED |
3398 | static __net_init int proto_init_net(struct net *net) |
3399 | { | |
c3506372 CH |
3400 | if (!proc_create_net("protocols", 0444, net->proc_net, &proto_seq_ops, |
3401 | sizeof(struct seq_net_private))) | |
14e943db ED |
3402 | return -ENOMEM; |
3403 | ||
3404 | return 0; | |
3405 | } | |
3406 | ||
3407 | static __net_exit void proto_exit_net(struct net *net) | |
3408 | { | |
ece31ffd | 3409 | remove_proc_entry("protocols", net->proc_net); |
14e943db ED |
3410 | } |
3411 | ||
3412 | ||
3413 | static __net_initdata struct pernet_operations proto_net_ops = { | |
3414 | .init = proto_init_net, | |
3415 | .exit = proto_exit_net, | |
1da177e4 LT |
3416 | }; |
3417 | ||
3418 | static int __init proto_init(void) | |
3419 | { | |
14e943db | 3420 | return register_pernet_subsys(&proto_net_ops); |
1da177e4 LT |
3421 | } |
3422 | ||
3423 | subsys_initcall(proto_init); | |
3424 | ||
3425 | #endif /* PROC_FS */ | |
7db6b048 SS |
3426 | |
3427 | #ifdef CONFIG_NET_RX_BUSY_POLL | |
3428 | bool sk_busy_loop_end(void *p, unsigned long start_time) | |
3429 | { | |
3430 | struct sock *sk = p; | |
3431 | ||
3432 | return !skb_queue_empty(&sk->sk_receive_queue) || | |
3433 | sk_busy_loop_timeout(sk, start_time); | |
3434 | } | |
3435 | EXPORT_SYMBOL(sk_busy_loop_end); | |
3436 | #endif /* CONFIG_NET_RX_BUSY_POLL */ |