]>
Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * INET An implementation of the TCP/IP protocol suite for the LINUX | |
3 | * operating system. INET is implemented using the BSD Socket | |
4 | * interface as the means of communication with the user level. | |
5 | * | |
6 | * Generic socket support routines. Memory allocators, socket lock/release | |
7 | * handler for protocols to use and generic option handler. | |
8 | * | |
9 | * | |
02c30a84 | 10 | * Authors: Ross Biro |
1da177e4 LT |
11 | * Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG> |
12 | * Florian La Roche, <flla@stud.uni-sb.de> | |
13 | * Alan Cox, <A.Cox@swansea.ac.uk> | |
14 | * | |
15 | * Fixes: | |
16 | * Alan Cox : Numerous verify_area() problems | |
17 | * Alan Cox : Connecting on a connecting socket | |
18 | * now returns an error for tcp. | |
19 | * Alan Cox : sock->protocol is set correctly. | |
20 | * and is not sometimes left as 0. | |
21 | * Alan Cox : connect handles icmp errors on a | |
22 | * connect properly. Unfortunately there | |
23 | * is a restart syscall nasty there. I | |
24 | * can't match BSD without hacking the C | |
25 | * library. Ideas urgently sought! | |
26 | * Alan Cox : Disallow bind() to addresses that are | |
27 | * not ours - especially broadcast ones!! | |
28 | * Alan Cox : Socket 1024 _IS_ ok for users. (fencepost) | |
29 | * Alan Cox : sock_wfree/sock_rfree don't destroy sockets, | |
30 | * instead they leave that for the DESTROY timer. | |
31 | * Alan Cox : Clean up error flag in accept | |
32 | * Alan Cox : TCP ack handling is buggy, the DESTROY timer | |
33 | * was buggy. Put a remove_sock() in the handler | |
34 | * for memory when we hit 0. Also altered the timer | |
4ec93edb | 35 | * code. The ACK stuff can wait and needs major |
1da177e4 LT |
36 | * TCP layer surgery. |
37 | * Alan Cox : Fixed TCP ack bug, removed remove sock | |
38 | * and fixed timer/inet_bh race. | |
39 | * Alan Cox : Added zapped flag for TCP | |
40 | * Alan Cox : Move kfree_skb into skbuff.c and tidied up surplus code | |
41 | * Alan Cox : for new sk_buff allocations wmalloc/rmalloc now call alloc_skb | |
42 | * Alan Cox : kfree_s calls now are kfree_skbmem so we can track skb resources | |
43 | * Alan Cox : Supports socket option broadcast now as does udp. Packet and raw need fixing. | |
44 | * Alan Cox : Added RCVBUF,SNDBUF size setting. It suddenly occurred to me how easy it was so... | |
45 | * Rick Sladkey : Relaxed UDP rules for matching packets. | |
46 | * C.E.Hawkins : IFF_PROMISC/SIOCGHWADDR support | |
47 | * Pauline Middelink : identd support | |
48 | * Alan Cox : Fixed connect() taking signals I think. | |
49 | * Alan Cox : SO_LINGER supported | |
50 | * Alan Cox : Error reporting fixes | |
51 | * Anonymous : inet_create tidied up (sk->reuse setting) | |
52 | * Alan Cox : inet sockets don't set sk->type! | |
53 | * Alan Cox : Split socket option code | |
54 | * Alan Cox : Callbacks | |
55 | * Alan Cox : Nagle flag for Charles & Johannes stuff | |
56 | * Alex : Removed restriction on inet fioctl | |
57 | * Alan Cox : Splitting INET from NET core | |
58 | * Alan Cox : Fixed bogus SO_TYPE handling in getsockopt() | |
59 | * Adam Caldwell : Missing return in SO_DONTROUTE/SO_DEBUG code | |
60 | * Alan Cox : Split IP from generic code | |
61 | * Alan Cox : New kfree_skbmem() | |
62 | * Alan Cox : Make SO_DEBUG superuser only. | |
63 | * Alan Cox : Allow anyone to clear SO_DEBUG | |
64 | * (compatibility fix) | |
65 | * Alan Cox : Added optimistic memory grabbing for AF_UNIX throughput. | |
66 | * Alan Cox : Allocator for a socket is settable. | |
67 | * Alan Cox : SO_ERROR includes soft errors. | |
68 | * Alan Cox : Allow NULL arguments on some SO_ opts | |
69 | * Alan Cox : Generic socket allocation to make hooks | |
70 | * easier (suggested by Craig Metz). | |
71 | * Michael Pall : SO_ERROR returns positive errno again | |
72 | * Steve Whitehouse: Added default destructor to free | |
73 | * protocol private data. | |
74 | * Steve Whitehouse: Added various other default routines | |
75 | * common to several socket families. | |
76 | * Chris Evans : Call suser() check last on F_SETOWN | |
77 | * Jay Schulist : Added SO_ATTACH_FILTER and SO_DETACH_FILTER. | |
78 | * Andi Kleen : Add sock_kmalloc()/sock_kfree_s() | |
79 | * Andi Kleen : Fix write_space callback | |
80 | * Chris Evans : Security fixes - signedness again | |
81 | * Arnaldo C. Melo : cleanups, use skb_queue_purge | |
82 | * | |
83 | * To Fix: | |
84 | * | |
85 | * | |
86 | * This program is free software; you can redistribute it and/or | |
87 | * modify it under the terms of the GNU General Public License | |
88 | * as published by the Free Software Foundation; either version | |
89 | * 2 of the License, or (at your option) any later version. | |
90 | */ | |
91 | ||
e005d193 JP |
92 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
93 | ||
4fc268d2 | 94 | #include <linux/capability.h> |
1da177e4 | 95 | #include <linux/errno.h> |
cb820f8e | 96 | #include <linux/errqueue.h> |
1da177e4 LT |
97 | #include <linux/types.h> |
98 | #include <linux/socket.h> | |
99 | #include <linux/in.h> | |
100 | #include <linux/kernel.h> | |
1da177e4 LT |
101 | #include <linux/module.h> |
102 | #include <linux/proc_fs.h> | |
103 | #include <linux/seq_file.h> | |
104 | #include <linux/sched.h> | |
105 | #include <linux/timer.h> | |
106 | #include <linux/string.h> | |
107 | #include <linux/sockios.h> | |
108 | #include <linux/net.h> | |
109 | #include <linux/mm.h> | |
110 | #include <linux/slab.h> | |
111 | #include <linux/interrupt.h> | |
112 | #include <linux/poll.h> | |
113 | #include <linux/tcp.h> | |
114 | #include <linux/init.h> | |
a1f8e7f7 | 115 | #include <linux/highmem.h> |
3f551f94 | 116 | #include <linux/user_namespace.h> |
c5905afb | 117 | #include <linux/static_key.h> |
3969eb38 | 118 | #include <linux/memcontrol.h> |
8c1ae10d | 119 | #include <linux/prefetch.h> |
1da177e4 | 120 | |
7c0f6ba6 | 121 | #include <linux/uaccess.h> |
1da177e4 LT |
122 | |
123 | #include <linux/netdevice.h> | |
124 | #include <net/protocol.h> | |
125 | #include <linux/skbuff.h> | |
457c4cbc | 126 | #include <net/net_namespace.h> |
2e6599cb | 127 | #include <net/request_sock.h> |
1da177e4 | 128 | #include <net/sock.h> |
20d49473 | 129 | #include <linux/net_tstamp.h> |
1da177e4 LT |
130 | #include <net/xfrm.h> |
131 | #include <linux/ipsec.h> | |
f8451725 | 132 | #include <net/cls_cgroup.h> |
5bc1421e | 133 | #include <net/netprio_cgroup.h> |
eb4cb008 | 134 | #include <linux/sock_diag.h> |
1da177e4 LT |
135 | |
136 | #include <linux/filter.h> | |
538950a1 | 137 | #include <net/sock_reuseport.h> |
1da177e4 | 138 | |
3847ce32 SM |
139 | #include <trace/events/sock.h> |
140 | ||
1da177e4 LT |
141 | #ifdef CONFIG_INET |
142 | #include <net/tcp.h> | |
143 | #endif | |
144 | ||
076bb0c8 | 145 | #include <net/busy_poll.h> |
06021292 | 146 | |
36b77a52 | 147 | static DEFINE_MUTEX(proto_list_mutex); |
d1a4c0b3 GC |
148 | static LIST_HEAD(proto_list); |
149 | ||
a3b299da EB |
150 | /** |
151 | * sk_ns_capable - General socket capability test | |
152 | * @sk: Socket to use a capability on or through | |
153 | * @user_ns: The user namespace of the capability to use | |
154 | * @cap: The capability to use | |
155 | * | |
156 | * Test to see if the opener of the socket had when the socket was | |
157 | * created and the current process has the capability @cap in the user | |
158 | * namespace @user_ns. | |
159 | */ | |
160 | bool sk_ns_capable(const struct sock *sk, | |
161 | struct user_namespace *user_ns, int cap) | |
162 | { | |
163 | return file_ns_capable(sk->sk_socket->file, user_ns, cap) && | |
164 | ns_capable(user_ns, cap); | |
165 | } | |
166 | EXPORT_SYMBOL(sk_ns_capable); | |
167 | ||
168 | /** | |
169 | * sk_capable - Socket global capability test | |
170 | * @sk: Socket to use a capability on or through | |
e793c0f7 | 171 | * @cap: The global capability to use |
a3b299da EB |
172 | * |
173 | * Test to see if the opener of the socket had when the socket was | |
174 | * created and the current process has the capability @cap in all user | |
175 | * namespaces. | |
176 | */ | |
177 | bool sk_capable(const struct sock *sk, int cap) | |
178 | { | |
179 | return sk_ns_capable(sk, &init_user_ns, cap); | |
180 | } | |
181 | EXPORT_SYMBOL(sk_capable); | |
182 | ||
183 | /** | |
184 | * sk_net_capable - Network namespace socket capability test | |
185 | * @sk: Socket to use a capability on or through | |
186 | * @cap: The capability to use | |
187 | * | |
e793c0f7 | 188 | * Test to see if the opener of the socket had when the socket was created |
a3b299da EB |
189 | * and the current process has the capability @cap over the network namespace |
190 | * the socket is a member of. | |
191 | */ | |
192 | bool sk_net_capable(const struct sock *sk, int cap) | |
193 | { | |
194 | return sk_ns_capable(sk, sock_net(sk)->user_ns, cap); | |
195 | } | |
196 | EXPORT_SYMBOL(sk_net_capable); | |
197 | ||
da21f24d IM |
198 | /* |
199 | * Each address family might have different locking rules, so we have | |
cdfbabfb DH |
200 | * one slock key per address family and separate keys for internal and |
201 | * userspace sockets. | |
da21f24d | 202 | */ |
a5b5bb9a | 203 | static struct lock_class_key af_family_keys[AF_MAX]; |
cdfbabfb | 204 | static struct lock_class_key af_family_kern_keys[AF_MAX]; |
a5b5bb9a | 205 | static struct lock_class_key af_family_slock_keys[AF_MAX]; |
cdfbabfb | 206 | static struct lock_class_key af_family_kern_slock_keys[AF_MAX]; |
a5b5bb9a | 207 | |
a5b5bb9a IM |
208 | /* |
209 | * Make lock validator output more readable. (we pre-construct these | |
210 | * strings build-time, so that runtime initialization of socket | |
211 | * locks is fast): | |
212 | */ | |
cdfbabfb DH |
213 | |
214 | #define _sock_locks(x) \ | |
215 | x "AF_UNSPEC", x "AF_UNIX" , x "AF_INET" , \ | |
216 | x "AF_AX25" , x "AF_IPX" , x "AF_APPLETALK", \ | |
217 | x "AF_NETROM", x "AF_BRIDGE" , x "AF_ATMPVC" , \ | |
218 | x "AF_X25" , x "AF_INET6" , x "AF_ROSE" , \ | |
219 | x "AF_DECnet", x "AF_NETBEUI" , x "AF_SECURITY" , \ | |
220 | x "AF_KEY" , x "AF_NETLINK" , x "AF_PACKET" , \ | |
221 | x "AF_ASH" , x "AF_ECONET" , x "AF_ATMSVC" , \ | |
222 | x "AF_RDS" , x "AF_SNA" , x "AF_IRDA" , \ | |
223 | x "AF_PPPOX" , x "AF_WANPIPE" , x "AF_LLC" , \ | |
224 | x "27" , x "28" , x "AF_CAN" , \ | |
225 | x "AF_TIPC" , x "AF_BLUETOOTH", x "IUCV" , \ | |
226 | x "AF_RXRPC" , x "AF_ISDN" , x "AF_PHONET" , \ | |
227 | x "AF_IEEE802154", x "AF_CAIF" , x "AF_ALG" , \ | |
228 | x "AF_NFC" , x "AF_VSOCK" , x "AF_KCM" , \ | |
229 | x "AF_QIPCRTR", x "AF_SMC" , x "AF_MAX" | |
230 | ||
36cbd3dc | 231 | static const char *const af_family_key_strings[AF_MAX+1] = { |
cdfbabfb | 232 | _sock_locks("sk_lock-") |
a5b5bb9a | 233 | }; |
36cbd3dc | 234 | static const char *const af_family_slock_key_strings[AF_MAX+1] = { |
cdfbabfb | 235 | _sock_locks("slock-") |
a5b5bb9a | 236 | }; |
36cbd3dc | 237 | static const char *const af_family_clock_key_strings[AF_MAX+1] = { |
cdfbabfb DH |
238 | _sock_locks("clock-") |
239 | }; | |
240 | ||
241 | static const char *const af_family_kern_key_strings[AF_MAX+1] = { | |
242 | _sock_locks("k-sk_lock-") | |
243 | }; | |
244 | static const char *const af_family_kern_slock_key_strings[AF_MAX+1] = { | |
245 | _sock_locks("k-slock-") | |
246 | }; | |
247 | static const char *const af_family_kern_clock_key_strings[AF_MAX+1] = { | |
248 | _sock_locks("k-clock-") | |
443aef0e | 249 | }; |
da21f24d IM |
250 | |
251 | /* | |
252 | * sk_callback_lock locking rules are per-address-family, | |
253 | * so split the lock classes by using a per-AF key: | |
254 | */ | |
255 | static struct lock_class_key af_callback_keys[AF_MAX]; | |
cdfbabfb | 256 | static struct lock_class_key af_kern_callback_keys[AF_MAX]; |
da21f24d | 257 | |
1da177e4 LT |
258 | /* Take into consideration the size of the struct sk_buff overhead in the |
259 | * determination of these values, since that is non-constant across | |
260 | * platforms. This makes socket queueing behavior and performance | |
261 | * not depend upon such differences. | |
262 | */ | |
263 | #define _SK_MEM_PACKETS 256 | |
87fb4b7b | 264 | #define _SK_MEM_OVERHEAD SKB_TRUESIZE(256) |
1da177e4 LT |
265 | #define SK_WMEM_MAX (_SK_MEM_OVERHEAD * _SK_MEM_PACKETS) |
266 | #define SK_RMEM_MAX (_SK_MEM_OVERHEAD * _SK_MEM_PACKETS) | |
267 | ||
268 | /* Run time adjustable parameters. */ | |
ab32ea5d | 269 | __u32 sysctl_wmem_max __read_mostly = SK_WMEM_MAX; |
6d8ebc8a | 270 | EXPORT_SYMBOL(sysctl_wmem_max); |
ab32ea5d | 271 | __u32 sysctl_rmem_max __read_mostly = SK_RMEM_MAX; |
6d8ebc8a | 272 | EXPORT_SYMBOL(sysctl_rmem_max); |
ab32ea5d BH |
273 | __u32 sysctl_wmem_default __read_mostly = SK_WMEM_MAX; |
274 | __u32 sysctl_rmem_default __read_mostly = SK_RMEM_MAX; | |
1da177e4 | 275 | |
25985edc | 276 | /* Maximal space eaten by iovec or ancillary data plus some space */ |
ab32ea5d | 277 | int sysctl_optmem_max __read_mostly = sizeof(unsigned long)*(2*UIO_MAXIOV+512); |
2a91525c | 278 | EXPORT_SYMBOL(sysctl_optmem_max); |
1da177e4 | 279 | |
b245be1f WB |
280 | int sysctl_tstamp_allow_data __read_mostly = 1; |
281 | ||
c93bdd0e MG |
282 | struct static_key memalloc_socks = STATIC_KEY_INIT_FALSE; |
283 | EXPORT_SYMBOL_GPL(memalloc_socks); | |
284 | ||
7cb02404 MG |
285 | /** |
286 | * sk_set_memalloc - sets %SOCK_MEMALLOC | |
287 | * @sk: socket to set it on | |
288 | * | |
289 | * Set %SOCK_MEMALLOC on a socket for access to emergency reserves. | |
290 | * It's the responsibility of the admin to adjust min_free_kbytes | |
291 | * to meet the requirements | |
292 | */ | |
293 | void sk_set_memalloc(struct sock *sk) | |
294 | { | |
295 | sock_set_flag(sk, SOCK_MEMALLOC); | |
296 | sk->sk_allocation |= __GFP_MEMALLOC; | |
c93bdd0e | 297 | static_key_slow_inc(&memalloc_socks); |
7cb02404 MG |
298 | } |
299 | EXPORT_SYMBOL_GPL(sk_set_memalloc); | |
300 | ||
301 | void sk_clear_memalloc(struct sock *sk) | |
302 | { | |
303 | sock_reset_flag(sk, SOCK_MEMALLOC); | |
304 | sk->sk_allocation &= ~__GFP_MEMALLOC; | |
c93bdd0e | 305 | static_key_slow_dec(&memalloc_socks); |
c76562b6 MG |
306 | |
307 | /* | |
308 | * SOCK_MEMALLOC is allowed to ignore rmem limits to ensure forward | |
5d753610 MG |
309 | * progress of swapping. SOCK_MEMALLOC may be cleared while |
310 | * it has rmem allocations due to the last swapfile being deactivated | |
311 | * but there is a risk that the socket is unusable due to exceeding | |
312 | * the rmem limits. Reclaim the reserves and obey rmem limits again. | |
c76562b6 | 313 | */ |
5d753610 | 314 | sk_mem_reclaim(sk); |
7cb02404 MG |
315 | } |
316 | EXPORT_SYMBOL_GPL(sk_clear_memalloc); | |
317 | ||
b4b9e355 MG |
318 | int __sk_backlog_rcv(struct sock *sk, struct sk_buff *skb) |
319 | { | |
320 | int ret; | |
321 | unsigned long pflags = current->flags; | |
322 | ||
323 | /* these should have been dropped before queueing */ | |
324 | BUG_ON(!sock_flag(sk, SOCK_MEMALLOC)); | |
325 | ||
326 | current->flags |= PF_MEMALLOC; | |
327 | ret = sk->sk_backlog_rcv(sk, skb); | |
328 | tsk_restore_flags(current, pflags, PF_MEMALLOC); | |
329 | ||
330 | return ret; | |
331 | } | |
332 | EXPORT_SYMBOL(__sk_backlog_rcv); | |
333 | ||
1da177e4 LT |
334 | static int sock_set_timeout(long *timeo_p, char __user *optval, int optlen) |
335 | { | |
336 | struct timeval tv; | |
337 | ||
338 | if (optlen < sizeof(tv)) | |
339 | return -EINVAL; | |
340 | if (copy_from_user(&tv, optval, sizeof(tv))) | |
341 | return -EFAULT; | |
ba78073e VA |
342 | if (tv.tv_usec < 0 || tv.tv_usec >= USEC_PER_SEC) |
343 | return -EDOM; | |
1da177e4 | 344 | |
ba78073e | 345 | if (tv.tv_sec < 0) { |
6f11df83 AM |
346 | static int warned __read_mostly; |
347 | ||
ba78073e | 348 | *timeo_p = 0; |
50aab54f | 349 | if (warned < 10 && net_ratelimit()) { |
ba78073e | 350 | warned++; |
e005d193 JP |
351 | pr_info("%s: `%s' (pid %d) tries to set negative timeout\n", |
352 | __func__, current->comm, task_pid_nr(current)); | |
50aab54f | 353 | } |
ba78073e VA |
354 | return 0; |
355 | } | |
1da177e4 LT |
356 | *timeo_p = MAX_SCHEDULE_TIMEOUT; |
357 | if (tv.tv_sec == 0 && tv.tv_usec == 0) | |
358 | return 0; | |
359 | if (tv.tv_sec < (MAX_SCHEDULE_TIMEOUT/HZ - 1)) | |
8ccde4c5 | 360 | *timeo_p = tv.tv_sec * HZ + DIV_ROUND_UP(tv.tv_usec, USEC_PER_SEC / HZ); |
1da177e4 LT |
361 | return 0; |
362 | } | |
363 | ||
364 | static void sock_warn_obsolete_bsdism(const char *name) | |
365 | { | |
366 | static int warned; | |
367 | static char warncomm[TASK_COMM_LEN]; | |
4ec93edb YH |
368 | if (strcmp(warncomm, current->comm) && warned < 5) { |
369 | strcpy(warncomm, current->comm); | |
e005d193 JP |
370 | pr_warn("process `%s' is using obsolete %s SO_BSDCOMPAT\n", |
371 | warncomm, name); | |
1da177e4 LT |
372 | warned++; |
373 | } | |
374 | } | |
375 | ||
080a270f HFS |
376 | static bool sock_needs_netstamp(const struct sock *sk) |
377 | { | |
378 | switch (sk->sk_family) { | |
379 | case AF_UNSPEC: | |
380 | case AF_UNIX: | |
381 | return false; | |
382 | default: | |
383 | return true; | |
384 | } | |
385 | } | |
386 | ||
08e29af3 | 387 | static void sock_disable_timestamp(struct sock *sk, unsigned long flags) |
4ec93edb | 388 | { |
08e29af3 ED |
389 | if (sk->sk_flags & flags) { |
390 | sk->sk_flags &= ~flags; | |
080a270f HFS |
391 | if (sock_needs_netstamp(sk) && |
392 | !(sk->sk_flags & SK_FLAGS_TIMESTAMP)) | |
20d49473 | 393 | net_disable_timestamp(); |
1da177e4 LT |
394 | } |
395 | } | |
396 | ||
397 | ||
e6afc8ac | 398 | int __sock_queue_rcv_skb(struct sock *sk, struct sk_buff *skb) |
f0088a50 | 399 | { |
3b885787 NH |
400 | unsigned long flags; |
401 | struct sk_buff_head *list = &sk->sk_receive_queue; | |
f0088a50 | 402 | |
0fd7bac6 | 403 | if (atomic_read(&sk->sk_rmem_alloc) >= sk->sk_rcvbuf) { |
766e9037 | 404 | atomic_inc(&sk->sk_drops); |
3847ce32 | 405 | trace_sock_rcvqueue_full(sk, skb); |
766e9037 | 406 | return -ENOMEM; |
f0088a50 DV |
407 | } |
408 | ||
c76562b6 | 409 | if (!sk_rmem_schedule(sk, skb, skb->truesize)) { |
766e9037 ED |
410 | atomic_inc(&sk->sk_drops); |
411 | return -ENOBUFS; | |
3ab224be HA |
412 | } |
413 | ||
f0088a50 DV |
414 | skb->dev = NULL; |
415 | skb_set_owner_r(skb, sk); | |
49ad9599 | 416 | |
7fee226a ED |
417 | /* we escape from rcu protected region, make sure we dont leak |
418 | * a norefcounted dst | |
419 | */ | |
420 | skb_dst_force(skb); | |
421 | ||
3b885787 | 422 | spin_lock_irqsave(&list->lock, flags); |
3bc3b96f | 423 | sock_skb_set_dropcount(sk, skb); |
3b885787 NH |
424 | __skb_queue_tail(list, skb); |
425 | spin_unlock_irqrestore(&list->lock, flags); | |
f0088a50 DV |
426 | |
427 | if (!sock_flag(sk, SOCK_DEAD)) | |
676d2369 | 428 | sk->sk_data_ready(sk); |
766e9037 | 429 | return 0; |
f0088a50 | 430 | } |
e6afc8ac | 431 | EXPORT_SYMBOL(__sock_queue_rcv_skb); |
432 | ||
433 | int sock_queue_rcv_skb(struct sock *sk, struct sk_buff *skb) | |
434 | { | |
435 | int err; | |
436 | ||
437 | err = sk_filter(sk, skb); | |
438 | if (err) | |
439 | return err; | |
440 | ||
441 | return __sock_queue_rcv_skb(sk, skb); | |
442 | } | |
f0088a50 DV |
443 | EXPORT_SYMBOL(sock_queue_rcv_skb); |
444 | ||
4f0c40d9 | 445 | int __sk_receive_skb(struct sock *sk, struct sk_buff *skb, |
c3f24cfb | 446 | const int nested, unsigned int trim_cap, bool refcounted) |
f0088a50 DV |
447 | { |
448 | int rc = NET_RX_SUCCESS; | |
449 | ||
4f0c40d9 | 450 | if (sk_filter_trim_cap(sk, skb, trim_cap)) |
f0088a50 DV |
451 | goto discard_and_relse; |
452 | ||
453 | skb->dev = NULL; | |
454 | ||
274f482d | 455 | if (sk_rcvqueues_full(sk, sk->sk_rcvbuf)) { |
c377411f ED |
456 | atomic_inc(&sk->sk_drops); |
457 | goto discard_and_relse; | |
458 | } | |
58a5a7b9 ACM |
459 | if (nested) |
460 | bh_lock_sock_nested(sk); | |
461 | else | |
462 | bh_lock_sock(sk); | |
a5b5bb9a IM |
463 | if (!sock_owned_by_user(sk)) { |
464 | /* | |
465 | * trylock + unlock semantics: | |
466 | */ | |
467 | mutex_acquire(&sk->sk_lock.dep_map, 0, 1, _RET_IP_); | |
468 | ||
c57943a1 | 469 | rc = sk_backlog_rcv(sk, skb); |
a5b5bb9a IM |
470 | |
471 | mutex_release(&sk->sk_lock.dep_map, 1, _RET_IP_); | |
f545a38f | 472 | } else if (sk_add_backlog(sk, skb, sk->sk_rcvbuf)) { |
8eae939f ZY |
473 | bh_unlock_sock(sk); |
474 | atomic_inc(&sk->sk_drops); | |
475 | goto discard_and_relse; | |
476 | } | |
477 | ||
f0088a50 DV |
478 | bh_unlock_sock(sk); |
479 | out: | |
c3f24cfb ED |
480 | if (refcounted) |
481 | sock_put(sk); | |
f0088a50 DV |
482 | return rc; |
483 | discard_and_relse: | |
484 | kfree_skb(skb); | |
485 | goto out; | |
486 | } | |
4f0c40d9 | 487 | EXPORT_SYMBOL(__sk_receive_skb); |
f0088a50 DV |
488 | |
489 | struct dst_entry *__sk_dst_check(struct sock *sk, u32 cookie) | |
490 | { | |
b6c6712a | 491 | struct dst_entry *dst = __sk_dst_get(sk); |
f0088a50 DV |
492 | |
493 | if (dst && dst->obsolete && dst->ops->check(dst, cookie) == NULL) { | |
e022f0b4 | 494 | sk_tx_queue_clear(sk); |
9b8805a3 | 495 | sk->sk_dst_pending_confirm = 0; |
a9b3cd7f | 496 | RCU_INIT_POINTER(sk->sk_dst_cache, NULL); |
f0088a50 DV |
497 | dst_release(dst); |
498 | return NULL; | |
499 | } | |
500 | ||
501 | return dst; | |
502 | } | |
503 | EXPORT_SYMBOL(__sk_dst_check); | |
504 | ||
505 | struct dst_entry *sk_dst_check(struct sock *sk, u32 cookie) | |
506 | { | |
507 | struct dst_entry *dst = sk_dst_get(sk); | |
508 | ||
509 | if (dst && dst->obsolete && dst->ops->check(dst, cookie) == NULL) { | |
510 | sk_dst_reset(sk); | |
511 | dst_release(dst); | |
512 | return NULL; | |
513 | } | |
514 | ||
515 | return dst; | |
516 | } | |
517 | EXPORT_SYMBOL(sk_dst_check); | |
518 | ||
c91f6df2 BH |
519 | static int sock_setbindtodevice(struct sock *sk, char __user *optval, |
520 | int optlen) | |
4878809f DM |
521 | { |
522 | int ret = -ENOPROTOOPT; | |
523 | #ifdef CONFIG_NETDEVICES | |
3b1e0a65 | 524 | struct net *net = sock_net(sk); |
4878809f DM |
525 | char devname[IFNAMSIZ]; |
526 | int index; | |
527 | ||
528 | /* Sorry... */ | |
529 | ret = -EPERM; | |
5e1fccc0 | 530 | if (!ns_capable(net->user_ns, CAP_NET_RAW)) |
4878809f DM |
531 | goto out; |
532 | ||
533 | ret = -EINVAL; | |
534 | if (optlen < 0) | |
535 | goto out; | |
536 | ||
537 | /* Bind this socket to a particular device like "eth0", | |
538 | * as specified in the passed interface name. If the | |
539 | * name is "" or the option length is zero the socket | |
540 | * is not bound. | |
541 | */ | |
542 | if (optlen > IFNAMSIZ - 1) | |
543 | optlen = IFNAMSIZ - 1; | |
544 | memset(devname, 0, sizeof(devname)); | |
545 | ||
546 | ret = -EFAULT; | |
547 | if (copy_from_user(devname, optval, optlen)) | |
548 | goto out; | |
549 | ||
000ba2e4 DM |
550 | index = 0; |
551 | if (devname[0] != '\0') { | |
bf8e56bf | 552 | struct net_device *dev; |
4878809f | 553 | |
bf8e56bf ED |
554 | rcu_read_lock(); |
555 | dev = dev_get_by_name_rcu(net, devname); | |
556 | if (dev) | |
557 | index = dev->ifindex; | |
558 | rcu_read_unlock(); | |
4878809f DM |
559 | ret = -ENODEV; |
560 | if (!dev) | |
561 | goto out; | |
4878809f DM |
562 | } |
563 | ||
564 | lock_sock(sk); | |
565 | sk->sk_bound_dev_if = index; | |
566 | sk_dst_reset(sk); | |
567 | release_sock(sk); | |
568 | ||
569 | ret = 0; | |
570 | ||
571 | out: | |
572 | #endif | |
573 | ||
574 | return ret; | |
575 | } | |
576 | ||
c91f6df2 BH |
577 | static int sock_getbindtodevice(struct sock *sk, char __user *optval, |
578 | int __user *optlen, int len) | |
579 | { | |
580 | int ret = -ENOPROTOOPT; | |
581 | #ifdef CONFIG_NETDEVICES | |
582 | struct net *net = sock_net(sk); | |
c91f6df2 | 583 | char devname[IFNAMSIZ]; |
c91f6df2 BH |
584 | |
585 | if (sk->sk_bound_dev_if == 0) { | |
586 | len = 0; | |
587 | goto zero; | |
588 | } | |
589 | ||
590 | ret = -EINVAL; | |
591 | if (len < IFNAMSIZ) | |
592 | goto out; | |
593 | ||
5dbe7c17 NS |
594 | ret = netdev_get_name(net, devname, sk->sk_bound_dev_if); |
595 | if (ret) | |
c91f6df2 | 596 | goto out; |
c91f6df2 BH |
597 | |
598 | len = strlen(devname) + 1; | |
599 | ||
600 | ret = -EFAULT; | |
601 | if (copy_to_user(optval, devname, len)) | |
602 | goto out; | |
603 | ||
604 | zero: | |
605 | ret = -EFAULT; | |
606 | if (put_user(len, optlen)) | |
607 | goto out; | |
608 | ||
609 | ret = 0; | |
610 | ||
611 | out: | |
612 | #endif | |
613 | ||
614 | return ret; | |
615 | } | |
616 | ||
c0ef877b PE |
617 | static inline void sock_valbool_flag(struct sock *sk, int bit, int valbool) |
618 | { | |
619 | if (valbool) | |
620 | sock_set_flag(sk, bit); | |
621 | else | |
622 | sock_reset_flag(sk, bit); | |
623 | } | |
624 | ||
f60e5990 | 625 | bool sk_mc_loop(struct sock *sk) |
626 | { | |
627 | if (dev_recursion_level()) | |
628 | return false; | |
629 | if (!sk) | |
630 | return true; | |
631 | switch (sk->sk_family) { | |
632 | case AF_INET: | |
633 | return inet_sk(sk)->mc_loop; | |
634 | #if IS_ENABLED(CONFIG_IPV6) | |
635 | case AF_INET6: | |
636 | return inet6_sk(sk)->mc_loop; | |
637 | #endif | |
638 | } | |
639 | WARN_ON(1); | |
640 | return true; | |
641 | } | |
642 | EXPORT_SYMBOL(sk_mc_loop); | |
643 | ||
1da177e4 LT |
644 | /* |
645 | * This is meant for all protocols to use and covers goings on | |
646 | * at the socket level. Everything here is generic. | |
647 | */ | |
648 | ||
649 | int sock_setsockopt(struct socket *sock, int level, int optname, | |
b7058842 | 650 | char __user *optval, unsigned int optlen) |
1da177e4 | 651 | { |
2a91525c | 652 | struct sock *sk = sock->sk; |
1da177e4 LT |
653 | int val; |
654 | int valbool; | |
655 | struct linger ling; | |
656 | int ret = 0; | |
4ec93edb | 657 | |
1da177e4 LT |
658 | /* |
659 | * Options without arguments | |
660 | */ | |
661 | ||
4878809f | 662 | if (optname == SO_BINDTODEVICE) |
c91f6df2 | 663 | return sock_setbindtodevice(sk, optval, optlen); |
4878809f | 664 | |
e71a4783 SH |
665 | if (optlen < sizeof(int)) |
666 | return -EINVAL; | |
4ec93edb | 667 | |
1da177e4 LT |
668 | if (get_user(val, (int __user *)optval)) |
669 | return -EFAULT; | |
4ec93edb | 670 | |
2a91525c | 671 | valbool = val ? 1 : 0; |
1da177e4 LT |
672 | |
673 | lock_sock(sk); | |
674 | ||
2a91525c | 675 | switch (optname) { |
e71a4783 | 676 | case SO_DEBUG: |
2a91525c | 677 | if (val && !capable(CAP_NET_ADMIN)) |
e71a4783 | 678 | ret = -EACCES; |
2a91525c | 679 | else |
c0ef877b | 680 | sock_valbool_flag(sk, SOCK_DBG, valbool); |
e71a4783 SH |
681 | break; |
682 | case SO_REUSEADDR: | |
4a17fd52 | 683 | sk->sk_reuse = (valbool ? SK_CAN_REUSE : SK_NO_REUSE); |
e71a4783 | 684 | break; |
055dc21a TH |
685 | case SO_REUSEPORT: |
686 | sk->sk_reuseport = valbool; | |
687 | break; | |
e71a4783 | 688 | case SO_TYPE: |
49c794e9 | 689 | case SO_PROTOCOL: |
0d6038ee | 690 | case SO_DOMAIN: |
e71a4783 SH |
691 | case SO_ERROR: |
692 | ret = -ENOPROTOOPT; | |
693 | break; | |
694 | case SO_DONTROUTE: | |
c0ef877b | 695 | sock_valbool_flag(sk, SOCK_LOCALROUTE, valbool); |
e71a4783 SH |
696 | break; |
697 | case SO_BROADCAST: | |
698 | sock_valbool_flag(sk, SOCK_BROADCAST, valbool); | |
699 | break; | |
700 | case SO_SNDBUF: | |
701 | /* Don't error on this BSD doesn't and if you think | |
82981930 ED |
702 | * about it this is right. Otherwise apps have to |
703 | * play 'guess the biggest size' games. RCVBUF/SNDBUF | |
704 | * are treated in BSD as hints | |
705 | */ | |
706 | val = min_t(u32, val, sysctl_wmem_max); | |
b0573dea | 707 | set_sndbuf: |
e71a4783 | 708 | sk->sk_userlocks |= SOCK_SNDBUF_LOCK; |
b98b0bc8 | 709 | sk->sk_sndbuf = max_t(int, val * 2, SOCK_MIN_SNDBUF); |
82981930 | 710 | /* Wake up sending tasks if we upped the value. */ |
e71a4783 SH |
711 | sk->sk_write_space(sk); |
712 | break; | |
1da177e4 | 713 | |
e71a4783 SH |
714 | case SO_SNDBUFFORCE: |
715 | if (!capable(CAP_NET_ADMIN)) { | |
716 | ret = -EPERM; | |
717 | break; | |
718 | } | |
719 | goto set_sndbuf; | |
b0573dea | 720 | |
e71a4783 SH |
721 | case SO_RCVBUF: |
722 | /* Don't error on this BSD doesn't and if you think | |
82981930 ED |
723 | * about it this is right. Otherwise apps have to |
724 | * play 'guess the biggest size' games. RCVBUF/SNDBUF | |
725 | * are treated in BSD as hints | |
726 | */ | |
727 | val = min_t(u32, val, sysctl_rmem_max); | |
b0573dea | 728 | set_rcvbuf: |
e71a4783 SH |
729 | sk->sk_userlocks |= SOCK_RCVBUF_LOCK; |
730 | /* | |
731 | * We double it on the way in to account for | |
732 | * "struct sk_buff" etc. overhead. Applications | |
733 | * assume that the SO_RCVBUF setting they make will | |
734 | * allow that much actual data to be received on that | |
735 | * socket. | |
736 | * | |
737 | * Applications are unaware that "struct sk_buff" and | |
738 | * other overheads allocate from the receive buffer | |
739 | * during socket buffer allocation. | |
740 | * | |
741 | * And after considering the possible alternatives, | |
742 | * returning the value we actually used in getsockopt | |
743 | * is the most desirable behavior. | |
744 | */ | |
b98b0bc8 | 745 | sk->sk_rcvbuf = max_t(int, val * 2, SOCK_MIN_RCVBUF); |
e71a4783 SH |
746 | break; |
747 | ||
748 | case SO_RCVBUFFORCE: | |
749 | if (!capable(CAP_NET_ADMIN)) { | |
750 | ret = -EPERM; | |
1da177e4 | 751 | break; |
e71a4783 SH |
752 | } |
753 | goto set_rcvbuf; | |
1da177e4 | 754 | |
e71a4783 | 755 | case SO_KEEPALIVE: |
4b9d07a4 UB |
756 | if (sk->sk_prot->keepalive) |
757 | sk->sk_prot->keepalive(sk, valbool); | |
e71a4783 SH |
758 | sock_valbool_flag(sk, SOCK_KEEPOPEN, valbool); |
759 | break; | |
760 | ||
761 | case SO_OOBINLINE: | |
762 | sock_valbool_flag(sk, SOCK_URGINLINE, valbool); | |
763 | break; | |
764 | ||
765 | case SO_NO_CHECK: | |
28448b80 | 766 | sk->sk_no_check_tx = valbool; |
e71a4783 SH |
767 | break; |
768 | ||
769 | case SO_PRIORITY: | |
5e1fccc0 EB |
770 | if ((val >= 0 && val <= 6) || |
771 | ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN)) | |
e71a4783 SH |
772 | sk->sk_priority = val; |
773 | else | |
774 | ret = -EPERM; | |
775 | break; | |
776 | ||
777 | case SO_LINGER: | |
778 | if (optlen < sizeof(ling)) { | |
779 | ret = -EINVAL; /* 1003.1g */ | |
1da177e4 | 780 | break; |
e71a4783 | 781 | } |
2a91525c | 782 | if (copy_from_user(&ling, optval, sizeof(ling))) { |
e71a4783 | 783 | ret = -EFAULT; |
1da177e4 | 784 | break; |
e71a4783 SH |
785 | } |
786 | if (!ling.l_onoff) | |
787 | sock_reset_flag(sk, SOCK_LINGER); | |
788 | else { | |
1da177e4 | 789 | #if (BITS_PER_LONG == 32) |
e71a4783 SH |
790 | if ((unsigned int)ling.l_linger >= MAX_SCHEDULE_TIMEOUT/HZ) |
791 | sk->sk_lingertime = MAX_SCHEDULE_TIMEOUT; | |
1da177e4 | 792 | else |
e71a4783 SH |
793 | #endif |
794 | sk->sk_lingertime = (unsigned int)ling.l_linger * HZ; | |
795 | sock_set_flag(sk, SOCK_LINGER); | |
796 | } | |
797 | break; | |
798 | ||
799 | case SO_BSDCOMPAT: | |
800 | sock_warn_obsolete_bsdism("setsockopt"); | |
801 | break; | |
802 | ||
803 | case SO_PASSCRED: | |
804 | if (valbool) | |
805 | set_bit(SOCK_PASSCRED, &sock->flags); | |
806 | else | |
807 | clear_bit(SOCK_PASSCRED, &sock->flags); | |
808 | break; | |
809 | ||
810 | case SO_TIMESTAMP: | |
92f37fd2 | 811 | case SO_TIMESTAMPNS: |
e71a4783 | 812 | if (valbool) { |
92f37fd2 ED |
813 | if (optname == SO_TIMESTAMP) |
814 | sock_reset_flag(sk, SOCK_RCVTSTAMPNS); | |
815 | else | |
816 | sock_set_flag(sk, SOCK_RCVTSTAMPNS); | |
e71a4783 | 817 | sock_set_flag(sk, SOCK_RCVTSTAMP); |
20d49473 | 818 | sock_enable_timestamp(sk, SOCK_TIMESTAMP); |
92f37fd2 | 819 | } else { |
e71a4783 | 820 | sock_reset_flag(sk, SOCK_RCVTSTAMP); |
92f37fd2 ED |
821 | sock_reset_flag(sk, SOCK_RCVTSTAMPNS); |
822 | } | |
e71a4783 SH |
823 | break; |
824 | ||
20d49473 PO |
825 | case SO_TIMESTAMPING: |
826 | if (val & ~SOF_TIMESTAMPING_MASK) { | |
f249fb78 | 827 | ret = -EINVAL; |
20d49473 PO |
828 | break; |
829 | } | |
b245be1f | 830 | |
09c2d251 | 831 | if (val & SOF_TIMESTAMPING_OPT_ID && |
4ed2d765 | 832 | !(sk->sk_tsflags & SOF_TIMESTAMPING_OPT_ID)) { |
ac5cc977 WC |
833 | if (sk->sk_protocol == IPPROTO_TCP && |
834 | sk->sk_type == SOCK_STREAM) { | |
6db8b963 SHY |
835 | if ((1 << sk->sk_state) & |
836 | (TCPF_CLOSE | TCPF_LISTEN)) { | |
4ed2d765 WB |
837 | ret = -EINVAL; |
838 | break; | |
839 | } | |
840 | sk->sk_tskey = tcp_sk(sk)->snd_una; | |
841 | } else { | |
842 | sk->sk_tskey = 0; | |
843 | } | |
844 | } | |
1c885808 FY |
845 | |
846 | if (val & SOF_TIMESTAMPING_OPT_STATS && | |
847 | !(val & SOF_TIMESTAMPING_OPT_TSONLY)) { | |
848 | ret = -EINVAL; | |
849 | break; | |
850 | } | |
851 | ||
b9f40e21 | 852 | sk->sk_tsflags = val; |
20d49473 PO |
853 | if (val & SOF_TIMESTAMPING_RX_SOFTWARE) |
854 | sock_enable_timestamp(sk, | |
855 | SOCK_TIMESTAMPING_RX_SOFTWARE); | |
856 | else | |
857 | sock_disable_timestamp(sk, | |
08e29af3 | 858 | (1UL << SOCK_TIMESTAMPING_RX_SOFTWARE)); |
20d49473 PO |
859 | break; |
860 | ||
e71a4783 SH |
861 | case SO_RCVLOWAT: |
862 | if (val < 0) | |
863 | val = INT_MAX; | |
864 | sk->sk_rcvlowat = val ? : 1; | |
865 | break; | |
866 | ||
867 | case SO_RCVTIMEO: | |
868 | ret = sock_set_timeout(&sk->sk_rcvtimeo, optval, optlen); | |
869 | break; | |
870 | ||
871 | case SO_SNDTIMEO: | |
872 | ret = sock_set_timeout(&sk->sk_sndtimeo, optval, optlen); | |
873 | break; | |
1da177e4 | 874 | |
e71a4783 SH |
875 | case SO_ATTACH_FILTER: |
876 | ret = -EINVAL; | |
877 | if (optlen == sizeof(struct sock_fprog)) { | |
878 | struct sock_fprog fprog; | |
1da177e4 | 879 | |
e71a4783 SH |
880 | ret = -EFAULT; |
881 | if (copy_from_user(&fprog, optval, sizeof(fprog))) | |
1da177e4 | 882 | break; |
e71a4783 SH |
883 | |
884 | ret = sk_attach_filter(&fprog, sk); | |
885 | } | |
886 | break; | |
887 | ||
89aa0758 AS |
888 | case SO_ATTACH_BPF: |
889 | ret = -EINVAL; | |
890 | if (optlen == sizeof(u32)) { | |
891 | u32 ufd; | |
892 | ||
893 | ret = -EFAULT; | |
894 | if (copy_from_user(&ufd, optval, sizeof(ufd))) | |
895 | break; | |
896 | ||
897 | ret = sk_attach_bpf(ufd, sk); | |
898 | } | |
899 | break; | |
900 | ||
538950a1 CG |
901 | case SO_ATTACH_REUSEPORT_CBPF: |
902 | ret = -EINVAL; | |
903 | if (optlen == sizeof(struct sock_fprog)) { | |
904 | struct sock_fprog fprog; | |
905 | ||
906 | ret = -EFAULT; | |
907 | if (copy_from_user(&fprog, optval, sizeof(fprog))) | |
908 | break; | |
909 | ||
910 | ret = sk_reuseport_attach_filter(&fprog, sk); | |
911 | } | |
912 | break; | |
913 | ||
914 | case SO_ATTACH_REUSEPORT_EBPF: | |
915 | ret = -EINVAL; | |
916 | if (optlen == sizeof(u32)) { | |
917 | u32 ufd; | |
918 | ||
919 | ret = -EFAULT; | |
920 | if (copy_from_user(&ufd, optval, sizeof(ufd))) | |
921 | break; | |
922 | ||
923 | ret = sk_reuseport_attach_bpf(ufd, sk); | |
924 | } | |
925 | break; | |
926 | ||
e71a4783 | 927 | case SO_DETACH_FILTER: |
55b33325 | 928 | ret = sk_detach_filter(sk); |
e71a4783 | 929 | break; |
1da177e4 | 930 | |
d59577b6 VB |
931 | case SO_LOCK_FILTER: |
932 | if (sock_flag(sk, SOCK_FILTER_LOCKED) && !valbool) | |
933 | ret = -EPERM; | |
934 | else | |
935 | sock_valbool_flag(sk, SOCK_FILTER_LOCKED, valbool); | |
936 | break; | |
937 | ||
e71a4783 SH |
938 | case SO_PASSSEC: |
939 | if (valbool) | |
940 | set_bit(SOCK_PASSSEC, &sock->flags); | |
941 | else | |
942 | clear_bit(SOCK_PASSSEC, &sock->flags); | |
943 | break; | |
4a19ec58 | 944 | case SO_MARK: |
5e1fccc0 | 945 | if (!ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN)) |
4a19ec58 | 946 | ret = -EPERM; |
2a91525c | 947 | else |
4a19ec58 | 948 | sk->sk_mark = val; |
4a19ec58 | 949 | break; |
877ce7c1 | 950 | |
3b885787 | 951 | case SO_RXQ_OVFL: |
8083f0fc | 952 | sock_valbool_flag(sk, SOCK_RXQ_OVFL, valbool); |
3b885787 | 953 | break; |
6e3e939f JB |
954 | |
955 | case SO_WIFI_STATUS: | |
956 | sock_valbool_flag(sk, SOCK_WIFI_STATUS, valbool); | |
957 | break; | |
958 | ||
ef64a54f PE |
959 | case SO_PEEK_OFF: |
960 | if (sock->ops->set_peek_off) | |
12663bfc | 961 | ret = sock->ops->set_peek_off(sk, val); |
ef64a54f PE |
962 | else |
963 | ret = -EOPNOTSUPP; | |
964 | break; | |
3bdc0eba BG |
965 | |
966 | case SO_NOFCS: | |
967 | sock_valbool_flag(sk, SOCK_NOFCS, valbool); | |
968 | break; | |
969 | ||
7d4c04fc KJ |
970 | case SO_SELECT_ERR_QUEUE: |
971 | sock_valbool_flag(sk, SOCK_SELECT_ERR_QUEUE, valbool); | |
972 | break; | |
973 | ||
e0d1095a | 974 | #ifdef CONFIG_NET_RX_BUSY_POLL |
64b0dc51 | 975 | case SO_BUSY_POLL: |
dafcc438 ET |
976 | /* allow unprivileged users to decrease the value */ |
977 | if ((val > sk->sk_ll_usec) && !capable(CAP_NET_ADMIN)) | |
978 | ret = -EPERM; | |
979 | else { | |
980 | if (val < 0) | |
981 | ret = -EINVAL; | |
982 | else | |
983 | sk->sk_ll_usec = val; | |
984 | } | |
985 | break; | |
986 | #endif | |
62748f32 ED |
987 | |
988 | case SO_MAX_PACING_RATE: | |
989 | sk->sk_max_pacing_rate = val; | |
990 | sk->sk_pacing_rate = min(sk->sk_pacing_rate, | |
991 | sk->sk_max_pacing_rate); | |
992 | break; | |
993 | ||
70da268b ED |
994 | case SO_INCOMING_CPU: |
995 | sk->sk_incoming_cpu = val; | |
996 | break; | |
997 | ||
a87cb3e4 TH |
998 | case SO_CNX_ADVICE: |
999 | if (val == 1) | |
1000 | dst_negative_advice(sk); | |
1001 | break; | |
e71a4783 SH |
1002 | default: |
1003 | ret = -ENOPROTOOPT; | |
1004 | break; | |
4ec93edb | 1005 | } |
1da177e4 LT |
1006 | release_sock(sk); |
1007 | return ret; | |
1008 | } | |
2a91525c | 1009 | EXPORT_SYMBOL(sock_setsockopt); |
1da177e4 LT |
1010 | |
1011 | ||
8f09898b | 1012 | static void cred_to_ucred(struct pid *pid, const struct cred *cred, |
1013 | struct ucred *ucred) | |
3f551f94 EB |
1014 | { |
1015 | ucred->pid = pid_vnr(pid); | |
1016 | ucred->uid = ucred->gid = -1; | |
1017 | if (cred) { | |
1018 | struct user_namespace *current_ns = current_user_ns(); | |
1019 | ||
b2e4f544 EB |
1020 | ucred->uid = from_kuid_munged(current_ns, cred->euid); |
1021 | ucred->gid = from_kgid_munged(current_ns, cred->egid); | |
3f551f94 EB |
1022 | } |
1023 | } | |
1024 | ||
1da177e4 LT |
1025 | int sock_getsockopt(struct socket *sock, int level, int optname, |
1026 | char __user *optval, int __user *optlen) | |
1027 | { | |
1028 | struct sock *sk = sock->sk; | |
4ec93edb | 1029 | |
e71a4783 | 1030 | union { |
4ec93edb YH |
1031 | int val; |
1032 | struct linger ling; | |
1da177e4 LT |
1033 | struct timeval tm; |
1034 | } v; | |
4ec93edb | 1035 | |
4d0392be | 1036 | int lv = sizeof(int); |
1da177e4 | 1037 | int len; |
4ec93edb | 1038 | |
e71a4783 | 1039 | if (get_user(len, optlen)) |
4ec93edb | 1040 | return -EFAULT; |
e71a4783 | 1041 | if (len < 0) |
1da177e4 | 1042 | return -EINVAL; |
4ec93edb | 1043 | |
50fee1de | 1044 | memset(&v, 0, sizeof(v)); |
df0bca04 | 1045 | |
2a91525c | 1046 | switch (optname) { |
e71a4783 SH |
1047 | case SO_DEBUG: |
1048 | v.val = sock_flag(sk, SOCK_DBG); | |
1049 | break; | |
1050 | ||
1051 | case SO_DONTROUTE: | |
1052 | v.val = sock_flag(sk, SOCK_LOCALROUTE); | |
1053 | break; | |
1054 | ||
1055 | case SO_BROADCAST: | |
1b23a5df | 1056 | v.val = sock_flag(sk, SOCK_BROADCAST); |
e71a4783 SH |
1057 | break; |
1058 | ||
1059 | case SO_SNDBUF: | |
1060 | v.val = sk->sk_sndbuf; | |
1061 | break; | |
1062 | ||
1063 | case SO_RCVBUF: | |
1064 | v.val = sk->sk_rcvbuf; | |
1065 | break; | |
1066 | ||
1067 | case SO_REUSEADDR: | |
1068 | v.val = sk->sk_reuse; | |
1069 | break; | |
1070 | ||
055dc21a TH |
1071 | case SO_REUSEPORT: |
1072 | v.val = sk->sk_reuseport; | |
1073 | break; | |
1074 | ||
e71a4783 | 1075 | case SO_KEEPALIVE: |
1b23a5df | 1076 | v.val = sock_flag(sk, SOCK_KEEPOPEN); |
e71a4783 SH |
1077 | break; |
1078 | ||
1079 | case SO_TYPE: | |
1080 | v.val = sk->sk_type; | |
1081 | break; | |
1082 | ||
49c794e9 JE |
1083 | case SO_PROTOCOL: |
1084 | v.val = sk->sk_protocol; | |
1085 | break; | |
1086 | ||
0d6038ee JE |
1087 | case SO_DOMAIN: |
1088 | v.val = sk->sk_family; | |
1089 | break; | |
1090 | ||
e71a4783 SH |
1091 | case SO_ERROR: |
1092 | v.val = -sock_error(sk); | |
2a91525c | 1093 | if (v.val == 0) |
e71a4783 SH |
1094 | v.val = xchg(&sk->sk_err_soft, 0); |
1095 | break; | |
1096 | ||
1097 | case SO_OOBINLINE: | |
1b23a5df | 1098 | v.val = sock_flag(sk, SOCK_URGINLINE); |
e71a4783 SH |
1099 | break; |
1100 | ||
1101 | case SO_NO_CHECK: | |
28448b80 | 1102 | v.val = sk->sk_no_check_tx; |
e71a4783 SH |
1103 | break; |
1104 | ||
1105 | case SO_PRIORITY: | |
1106 | v.val = sk->sk_priority; | |
1107 | break; | |
1108 | ||
1109 | case SO_LINGER: | |
1110 | lv = sizeof(v.ling); | |
1b23a5df | 1111 | v.ling.l_onoff = sock_flag(sk, SOCK_LINGER); |
e71a4783 SH |
1112 | v.ling.l_linger = sk->sk_lingertime / HZ; |
1113 | break; | |
1114 | ||
1115 | case SO_BSDCOMPAT: | |
1116 | sock_warn_obsolete_bsdism("getsockopt"); | |
1117 | break; | |
1118 | ||
1119 | case SO_TIMESTAMP: | |
92f37fd2 ED |
1120 | v.val = sock_flag(sk, SOCK_RCVTSTAMP) && |
1121 | !sock_flag(sk, SOCK_RCVTSTAMPNS); | |
1122 | break; | |
1123 | ||
1124 | case SO_TIMESTAMPNS: | |
1125 | v.val = sock_flag(sk, SOCK_RCVTSTAMPNS); | |
e71a4783 SH |
1126 | break; |
1127 | ||
20d49473 | 1128 | case SO_TIMESTAMPING: |
b9f40e21 | 1129 | v.val = sk->sk_tsflags; |
20d49473 PO |
1130 | break; |
1131 | ||
e71a4783 | 1132 | case SO_RCVTIMEO: |
2a91525c | 1133 | lv = sizeof(struct timeval); |
e71a4783 SH |
1134 | if (sk->sk_rcvtimeo == MAX_SCHEDULE_TIMEOUT) { |
1135 | v.tm.tv_sec = 0; | |
1136 | v.tm.tv_usec = 0; | |
1137 | } else { | |
1138 | v.tm.tv_sec = sk->sk_rcvtimeo / HZ; | |
8ccde4c5 | 1139 | v.tm.tv_usec = ((sk->sk_rcvtimeo % HZ) * USEC_PER_SEC) / HZ; |
e71a4783 SH |
1140 | } |
1141 | break; | |
1142 | ||
1143 | case SO_SNDTIMEO: | |
2a91525c | 1144 | lv = sizeof(struct timeval); |
e71a4783 SH |
1145 | if (sk->sk_sndtimeo == MAX_SCHEDULE_TIMEOUT) { |
1146 | v.tm.tv_sec = 0; | |
1147 | v.tm.tv_usec = 0; | |
1148 | } else { | |
1149 | v.tm.tv_sec = sk->sk_sndtimeo / HZ; | |
8ccde4c5 | 1150 | v.tm.tv_usec = ((sk->sk_sndtimeo % HZ) * USEC_PER_SEC) / HZ; |
e71a4783 SH |
1151 | } |
1152 | break; | |
1da177e4 | 1153 | |
e71a4783 SH |
1154 | case SO_RCVLOWAT: |
1155 | v.val = sk->sk_rcvlowat; | |
1156 | break; | |
1da177e4 | 1157 | |
e71a4783 | 1158 | case SO_SNDLOWAT: |
2a91525c | 1159 | v.val = 1; |
e71a4783 | 1160 | break; |
1da177e4 | 1161 | |
e71a4783 | 1162 | case SO_PASSCRED: |
82981930 | 1163 | v.val = !!test_bit(SOCK_PASSCRED, &sock->flags); |
e71a4783 | 1164 | break; |
1da177e4 | 1165 | |
e71a4783 | 1166 | case SO_PEERCRED: |
109f6e39 EB |
1167 | { |
1168 | struct ucred peercred; | |
1169 | if (len > sizeof(peercred)) | |
1170 | len = sizeof(peercred); | |
1171 | cred_to_ucred(sk->sk_peer_pid, sk->sk_peer_cred, &peercred); | |
1172 | if (copy_to_user(optval, &peercred, len)) | |
e71a4783 SH |
1173 | return -EFAULT; |
1174 | goto lenout; | |
109f6e39 | 1175 | } |
1da177e4 | 1176 | |
e71a4783 SH |
1177 | case SO_PEERNAME: |
1178 | { | |
1179 | char address[128]; | |
1180 | ||
1181 | if (sock->ops->getname(sock, (struct sockaddr *)address, &lv, 2)) | |
1182 | return -ENOTCONN; | |
1183 | if (lv < len) | |
1184 | return -EINVAL; | |
1185 | if (copy_to_user(optval, address, len)) | |
1186 | return -EFAULT; | |
1187 | goto lenout; | |
1188 | } | |
1da177e4 | 1189 | |
e71a4783 SH |
1190 | /* Dubious BSD thing... Probably nobody even uses it, but |
1191 | * the UNIX standard wants it for whatever reason... -DaveM | |
1192 | */ | |
1193 | case SO_ACCEPTCONN: | |
1194 | v.val = sk->sk_state == TCP_LISTEN; | |
1195 | break; | |
1da177e4 | 1196 | |
e71a4783 | 1197 | case SO_PASSSEC: |
82981930 | 1198 | v.val = !!test_bit(SOCK_PASSSEC, &sock->flags); |
e71a4783 | 1199 | break; |
877ce7c1 | 1200 | |
e71a4783 SH |
1201 | case SO_PEERSEC: |
1202 | return security_socket_getpeersec_stream(sock, optval, optlen, len); | |
1da177e4 | 1203 | |
4a19ec58 LAT |
1204 | case SO_MARK: |
1205 | v.val = sk->sk_mark; | |
1206 | break; | |
1207 | ||
3b885787 | 1208 | case SO_RXQ_OVFL: |
1b23a5df | 1209 | v.val = sock_flag(sk, SOCK_RXQ_OVFL); |
3b885787 NH |
1210 | break; |
1211 | ||
6e3e939f | 1212 | case SO_WIFI_STATUS: |
1b23a5df | 1213 | v.val = sock_flag(sk, SOCK_WIFI_STATUS); |
6e3e939f JB |
1214 | break; |
1215 | ||
ef64a54f PE |
1216 | case SO_PEEK_OFF: |
1217 | if (!sock->ops->set_peek_off) | |
1218 | return -EOPNOTSUPP; | |
1219 | ||
1220 | v.val = sk->sk_peek_off; | |
1221 | break; | |
bc2f7996 | 1222 | case SO_NOFCS: |
1b23a5df | 1223 | v.val = sock_flag(sk, SOCK_NOFCS); |
bc2f7996 | 1224 | break; |
c91f6df2 | 1225 | |
f7b86bfe | 1226 | case SO_BINDTODEVICE: |
c91f6df2 BH |
1227 | return sock_getbindtodevice(sk, optval, optlen, len); |
1228 | ||
a8fc9277 PE |
1229 | case SO_GET_FILTER: |
1230 | len = sk_get_filter(sk, (struct sock_filter __user *)optval, len); | |
1231 | if (len < 0) | |
1232 | return len; | |
1233 | ||
1234 | goto lenout; | |
c91f6df2 | 1235 | |
d59577b6 VB |
1236 | case SO_LOCK_FILTER: |
1237 | v.val = sock_flag(sk, SOCK_FILTER_LOCKED); | |
1238 | break; | |
1239 | ||
ea02f941 MS |
1240 | case SO_BPF_EXTENSIONS: |
1241 | v.val = bpf_tell_extensions(); | |
1242 | break; | |
1243 | ||
7d4c04fc KJ |
1244 | case SO_SELECT_ERR_QUEUE: |
1245 | v.val = sock_flag(sk, SOCK_SELECT_ERR_QUEUE); | |
1246 | break; | |
1247 | ||
e0d1095a | 1248 | #ifdef CONFIG_NET_RX_BUSY_POLL |
64b0dc51 | 1249 | case SO_BUSY_POLL: |
dafcc438 ET |
1250 | v.val = sk->sk_ll_usec; |
1251 | break; | |
1252 | #endif | |
1253 | ||
62748f32 ED |
1254 | case SO_MAX_PACING_RATE: |
1255 | v.val = sk->sk_max_pacing_rate; | |
1256 | break; | |
1257 | ||
2c8c56e1 ED |
1258 | case SO_INCOMING_CPU: |
1259 | v.val = sk->sk_incoming_cpu; | |
1260 | break; | |
1261 | ||
e71a4783 | 1262 | default: |
443b5991 YH |
1263 | /* We implement the SO_SNDLOWAT etc to not be settable |
1264 | * (1003.1g 7). | |
1265 | */ | |
e71a4783 | 1266 | return -ENOPROTOOPT; |
1da177e4 | 1267 | } |
e71a4783 | 1268 | |
1da177e4 LT |
1269 | if (len > lv) |
1270 | len = lv; | |
1271 | if (copy_to_user(optval, &v, len)) | |
1272 | return -EFAULT; | |
1273 | lenout: | |
4ec93edb YH |
1274 | if (put_user(len, optlen)) |
1275 | return -EFAULT; | |
1276 | return 0; | |
1da177e4 LT |
1277 | } |
1278 | ||
a5b5bb9a IM |
1279 | /* |
1280 | * Initialize an sk_lock. | |
1281 | * | |
1282 | * (We also register the sk_lock with the lock validator.) | |
1283 | */ | |
b6f99a21 | 1284 | static inline void sock_lock_init(struct sock *sk) |
a5b5bb9a | 1285 | { |
cdfbabfb DH |
1286 | if (sk->sk_kern_sock) |
1287 | sock_lock_init_class_and_name( | |
1288 | sk, | |
1289 | af_family_kern_slock_key_strings[sk->sk_family], | |
1290 | af_family_kern_slock_keys + sk->sk_family, | |
1291 | af_family_kern_key_strings[sk->sk_family], | |
1292 | af_family_kern_keys + sk->sk_family); | |
1293 | else | |
1294 | sock_lock_init_class_and_name( | |
1295 | sk, | |
ed07536e PZ |
1296 | af_family_slock_key_strings[sk->sk_family], |
1297 | af_family_slock_keys + sk->sk_family, | |
1298 | af_family_key_strings[sk->sk_family], | |
1299 | af_family_keys + sk->sk_family); | |
a5b5bb9a IM |
1300 | } |
1301 | ||
4dc6dc71 ED |
1302 | /* |
1303 | * Copy all fields from osk to nsk but nsk->sk_refcnt must not change yet, | |
1304 | * even temporarly, because of RCU lookups. sk_node should also be left as is. | |
68835aba | 1305 | * We must not copy fields between sk_dontcopy_begin and sk_dontcopy_end |
4dc6dc71 | 1306 | */ |
f1a6c4da PE |
1307 | static void sock_copy(struct sock *nsk, const struct sock *osk) |
1308 | { | |
1309 | #ifdef CONFIG_SECURITY_NETWORK | |
1310 | void *sptr = nsk->sk_security; | |
1311 | #endif | |
68835aba ED |
1312 | memcpy(nsk, osk, offsetof(struct sock, sk_dontcopy_begin)); |
1313 | ||
1314 | memcpy(&nsk->sk_dontcopy_end, &osk->sk_dontcopy_end, | |
1315 | osk->sk_prot->obj_size - offsetof(struct sock, sk_dontcopy_end)); | |
1316 | ||
f1a6c4da PE |
1317 | #ifdef CONFIG_SECURITY_NETWORK |
1318 | nsk->sk_security = sptr; | |
1319 | security_sk_clone(osk, nsk); | |
1320 | #endif | |
1321 | } | |
1322 | ||
2e4afe7b PE |
1323 | static struct sock *sk_prot_alloc(struct proto *prot, gfp_t priority, |
1324 | int family) | |
c308c1b2 PE |
1325 | { |
1326 | struct sock *sk; | |
1327 | struct kmem_cache *slab; | |
1328 | ||
1329 | slab = prot->slab; | |
e912b114 ED |
1330 | if (slab != NULL) { |
1331 | sk = kmem_cache_alloc(slab, priority & ~__GFP_ZERO); | |
1332 | if (!sk) | |
1333 | return sk; | |
ba2489b0 ED |
1334 | if (priority & __GFP_ZERO) |
1335 | sk_prot_clear_nulls(sk, prot->obj_size); | |
fcbdf09d | 1336 | } else |
c308c1b2 PE |
1337 | sk = kmalloc(prot->obj_size, priority); |
1338 | ||
2e4afe7b | 1339 | if (sk != NULL) { |
a98b65a3 VN |
1340 | kmemcheck_annotate_bitfield(sk, flags); |
1341 | ||
2e4afe7b PE |
1342 | if (security_sk_alloc(sk, family, priority)) |
1343 | goto out_free; | |
1344 | ||
1345 | if (!try_module_get(prot->owner)) | |
1346 | goto out_free_sec; | |
e022f0b4 | 1347 | sk_tx_queue_clear(sk); |
2e4afe7b PE |
1348 | } |
1349 | ||
c308c1b2 | 1350 | return sk; |
2e4afe7b PE |
1351 | |
1352 | out_free_sec: | |
1353 | security_sk_free(sk); | |
1354 | out_free: | |
1355 | if (slab != NULL) | |
1356 | kmem_cache_free(slab, sk); | |
1357 | else | |
1358 | kfree(sk); | |
1359 | return NULL; | |
c308c1b2 PE |
1360 | } |
1361 | ||
1362 | static void sk_prot_free(struct proto *prot, struct sock *sk) | |
1363 | { | |
1364 | struct kmem_cache *slab; | |
2e4afe7b | 1365 | struct module *owner; |
c308c1b2 | 1366 | |
2e4afe7b | 1367 | owner = prot->owner; |
c308c1b2 | 1368 | slab = prot->slab; |
2e4afe7b | 1369 | |
bd1060a1 | 1370 | cgroup_sk_free(&sk->sk_cgrp_data); |
2d758073 | 1371 | mem_cgroup_sk_free(sk); |
2e4afe7b | 1372 | security_sk_free(sk); |
c308c1b2 PE |
1373 | if (slab != NULL) |
1374 | kmem_cache_free(slab, sk); | |
1375 | else | |
1376 | kfree(sk); | |
2e4afe7b | 1377 | module_put(owner); |
c308c1b2 PE |
1378 | } |
1379 | ||
1da177e4 LT |
1380 | /** |
1381 | * sk_alloc - All socket objects are allocated here | |
c4ea43c5 | 1382 | * @net: the applicable net namespace |
4dc3b16b PP |
1383 | * @family: protocol family |
1384 | * @priority: for allocation (%GFP_KERNEL, %GFP_ATOMIC, etc) | |
1385 | * @prot: struct proto associated with this new sock instance | |
11aa9c28 | 1386 | * @kern: is this to be a kernel socket? |
1da177e4 | 1387 | */ |
1b8d7ae4 | 1388 | struct sock *sk_alloc(struct net *net, int family, gfp_t priority, |
11aa9c28 | 1389 | struct proto *prot, int kern) |
1da177e4 | 1390 | { |
c308c1b2 | 1391 | struct sock *sk; |
1da177e4 | 1392 | |
154adbc8 | 1393 | sk = sk_prot_alloc(prot, priority | __GFP_ZERO, family); |
1da177e4 | 1394 | if (sk) { |
154adbc8 PE |
1395 | sk->sk_family = family; |
1396 | /* | |
1397 | * See comment in struct sock definition to understand | |
1398 | * why we need sk_prot_creator -acme | |
1399 | */ | |
1400 | sk->sk_prot = sk->sk_prot_creator = prot; | |
cdfbabfb | 1401 | sk->sk_kern_sock = kern; |
154adbc8 | 1402 | sock_lock_init(sk); |
26abe143 EB |
1403 | sk->sk_net_refcnt = kern ? 0 : 1; |
1404 | if (likely(sk->sk_net_refcnt)) | |
1405 | get_net(net); | |
1406 | sock_net_set(sk, net); | |
d66ee058 | 1407 | atomic_set(&sk->sk_wmem_alloc, 1); |
f8451725 | 1408 | |
2d758073 | 1409 | mem_cgroup_sk_alloc(sk); |
d979a39d | 1410 | cgroup_sk_alloc(&sk->sk_cgrp_data); |
2a56a1fe TH |
1411 | sock_update_classid(&sk->sk_cgrp_data); |
1412 | sock_update_netprioidx(&sk->sk_cgrp_data); | |
1da177e4 | 1413 | } |
a79af59e | 1414 | |
2e4afe7b | 1415 | return sk; |
1da177e4 | 1416 | } |
2a91525c | 1417 | EXPORT_SYMBOL(sk_alloc); |
1da177e4 | 1418 | |
a4298e45 ED |
1419 | /* Sockets having SOCK_RCU_FREE will call this function after one RCU |
1420 | * grace period. This is the case for UDP sockets and TCP listeners. | |
1421 | */ | |
1422 | static void __sk_destruct(struct rcu_head *head) | |
1da177e4 | 1423 | { |
a4298e45 | 1424 | struct sock *sk = container_of(head, struct sock, sk_rcu); |
1da177e4 | 1425 | struct sk_filter *filter; |
1da177e4 LT |
1426 | |
1427 | if (sk->sk_destruct) | |
1428 | sk->sk_destruct(sk); | |
1429 | ||
a898def2 PM |
1430 | filter = rcu_dereference_check(sk->sk_filter, |
1431 | atomic_read(&sk->sk_wmem_alloc) == 0); | |
1da177e4 | 1432 | if (filter) { |
309dd5fc | 1433 | sk_filter_uncharge(sk, filter); |
a9b3cd7f | 1434 | RCU_INIT_POINTER(sk->sk_filter, NULL); |
1da177e4 | 1435 | } |
538950a1 CG |
1436 | if (rcu_access_pointer(sk->sk_reuseport_cb)) |
1437 | reuseport_detach_sock(sk); | |
1da177e4 | 1438 | |
08e29af3 | 1439 | sock_disable_timestamp(sk, SK_FLAGS_TIMESTAMP); |
1da177e4 LT |
1440 | |
1441 | if (atomic_read(&sk->sk_omem_alloc)) | |
e005d193 JP |
1442 | pr_debug("%s: optmem leakage (%d bytes) detected\n", |
1443 | __func__, atomic_read(&sk->sk_omem_alloc)); | |
1da177e4 | 1444 | |
22a0e18e ED |
1445 | if (sk->sk_frag.page) { |
1446 | put_page(sk->sk_frag.page); | |
1447 | sk->sk_frag.page = NULL; | |
1448 | } | |
1449 | ||
109f6e39 EB |
1450 | if (sk->sk_peer_cred) |
1451 | put_cred(sk->sk_peer_cred); | |
1452 | put_pid(sk->sk_peer_pid); | |
26abe143 EB |
1453 | if (likely(sk->sk_net_refcnt)) |
1454 | put_net(sock_net(sk)); | |
c308c1b2 | 1455 | sk_prot_free(sk->sk_prot_creator, sk); |
1da177e4 | 1456 | } |
2b85a34e | 1457 | |
a4298e45 ED |
1458 | void sk_destruct(struct sock *sk) |
1459 | { | |
1460 | if (sock_flag(sk, SOCK_RCU_FREE)) | |
1461 | call_rcu(&sk->sk_rcu, __sk_destruct); | |
1462 | else | |
1463 | __sk_destruct(&sk->sk_rcu); | |
1464 | } | |
1465 | ||
eb4cb008 CG |
1466 | static void __sk_free(struct sock *sk) |
1467 | { | |
b922622e | 1468 | if (unlikely(sock_diag_has_destroy_listeners(sk) && sk->sk_net_refcnt)) |
eb4cb008 CG |
1469 | sock_diag_broadcast_destroy(sk); |
1470 | else | |
1471 | sk_destruct(sk); | |
1472 | } | |
1473 | ||
2b85a34e ED |
1474 | void sk_free(struct sock *sk) |
1475 | { | |
1476 | /* | |
25985edc | 1477 | * We subtract one from sk_wmem_alloc and can know if |
2b85a34e ED |
1478 | * some packets are still in some tx queue. |
1479 | * If not null, sock_wfree() will call __sk_free(sk) later | |
1480 | */ | |
1481 | if (atomic_dec_and_test(&sk->sk_wmem_alloc)) | |
1482 | __sk_free(sk); | |
1483 | } | |
2a91525c | 1484 | EXPORT_SYMBOL(sk_free); |
1da177e4 | 1485 | |
e56c57d0 ED |
1486 | /** |
1487 | * sk_clone_lock - clone a socket, and lock its clone | |
1488 | * @sk: the socket to clone | |
1489 | * @priority: for allocation (%GFP_KERNEL, %GFP_ATOMIC, etc) | |
1490 | * | |
1491 | * Caller must unlock socket even in error path (bh_unlock_sock(newsk)) | |
1492 | */ | |
1493 | struct sock *sk_clone_lock(const struct sock *sk, const gfp_t priority) | |
87d11ceb | 1494 | { |
8fd1d178 | 1495 | struct sock *newsk; |
278571ba | 1496 | bool is_charged = true; |
87d11ceb | 1497 | |
8fd1d178 | 1498 | newsk = sk_prot_alloc(sk->sk_prot, priority, sk->sk_family); |
87d11ceb ACM |
1499 | if (newsk != NULL) { |
1500 | struct sk_filter *filter; | |
1501 | ||
892c141e | 1502 | sock_copy(newsk, sk); |
87d11ceb ACM |
1503 | |
1504 | /* SANITY */ | |
8a681736 SV |
1505 | if (likely(newsk->sk_net_refcnt)) |
1506 | get_net(sock_net(newsk)); | |
87d11ceb ACM |
1507 | sk_node_init(&newsk->sk_node); |
1508 | sock_lock_init(newsk); | |
1509 | bh_lock_sock(newsk); | |
fa438ccf | 1510 | newsk->sk_backlog.head = newsk->sk_backlog.tail = NULL; |
8eae939f | 1511 | newsk->sk_backlog.len = 0; |
87d11ceb ACM |
1512 | |
1513 | atomic_set(&newsk->sk_rmem_alloc, 0); | |
2b85a34e ED |
1514 | /* |
1515 | * sk_wmem_alloc set to one (see sk_free() and sock_wfree()) | |
1516 | */ | |
1517 | atomic_set(&newsk->sk_wmem_alloc, 1); | |
87d11ceb ACM |
1518 | atomic_set(&newsk->sk_omem_alloc, 0); |
1519 | skb_queue_head_init(&newsk->sk_receive_queue); | |
1520 | skb_queue_head_init(&newsk->sk_write_queue); | |
1521 | ||
87d11ceb | 1522 | rwlock_init(&newsk->sk_callback_lock); |
443aef0e PZ |
1523 | lockdep_set_class_and_name(&newsk->sk_callback_lock, |
1524 | af_callback_keys + newsk->sk_family, | |
1525 | af_family_clock_key_strings[newsk->sk_family]); | |
87d11ceb ACM |
1526 | |
1527 | newsk->sk_dst_cache = NULL; | |
9b8805a3 | 1528 | newsk->sk_dst_pending_confirm = 0; |
87d11ceb ACM |
1529 | newsk->sk_wmem_queued = 0; |
1530 | newsk->sk_forward_alloc = 0; | |
9caad864 | 1531 | atomic_set(&newsk->sk_drops, 0); |
87d11ceb | 1532 | newsk->sk_send_head = NULL; |
87d11ceb ACM |
1533 | newsk->sk_userlocks = sk->sk_userlocks & ~SOCK_BINDPORT_LOCK; |
1534 | ||
1535 | sock_reset_flag(newsk, SOCK_DONE); | |
1536 | skb_queue_head_init(&newsk->sk_error_queue); | |
1537 | ||
0d7da9dd | 1538 | filter = rcu_dereference_protected(newsk->sk_filter, 1); |
87d11ceb | 1539 | if (filter != NULL) |
278571ba AS |
1540 | /* though it's an empty new sock, the charging may fail |
1541 | * if sysctl_optmem_max was changed between creation of | |
1542 | * original socket and cloning | |
1543 | */ | |
1544 | is_charged = sk_filter_charge(newsk, filter); | |
87d11ceb | 1545 | |
d188ba86 | 1546 | if (unlikely(!is_charged || xfrm_sk_clone_policy(newsk, sk))) { |
a97e50cc DB |
1547 | /* We need to make sure that we don't uncharge the new |
1548 | * socket if we couldn't charge it in the first place | |
1549 | * as otherwise we uncharge the parent's filter. | |
1550 | */ | |
1551 | if (!is_charged) | |
1552 | RCU_INIT_POINTER(newsk->sk_filter, NULL); | |
94352d45 | 1553 | sk_free_unlock_clone(newsk); |
87d11ceb ACM |
1554 | newsk = NULL; |
1555 | goto out; | |
1556 | } | |
fa463497 | 1557 | RCU_INIT_POINTER(newsk->sk_reuseport_cb, NULL); |
87d11ceb ACM |
1558 | |
1559 | newsk->sk_err = 0; | |
e551c32d | 1560 | newsk->sk_err_soft = 0; |
87d11ceb | 1561 | newsk->sk_priority = 0; |
2c8c56e1 | 1562 | newsk->sk_incoming_cpu = raw_smp_processor_id(); |
33cf7c90 | 1563 | atomic64_set(&newsk->sk_cookie, 0); |
d979a39d | 1564 | |
2d758073 | 1565 | mem_cgroup_sk_alloc(newsk); |
d979a39d JW |
1566 | cgroup_sk_alloc(&newsk->sk_cgrp_data); |
1567 | ||
4dc6dc71 ED |
1568 | /* |
1569 | * Before updating sk_refcnt, we must commit prior changes to memory | |
1570 | * (Documentation/RCU/rculist_nulls.txt for details) | |
1571 | */ | |
1572 | smp_wmb(); | |
87d11ceb ACM |
1573 | atomic_set(&newsk->sk_refcnt, 2); |
1574 | ||
1575 | /* | |
1576 | * Increment the counter in the same struct proto as the master | |
1577 | * sock (sk_refcnt_debug_inc uses newsk->sk_prot->socks, that | |
1578 | * is the same as sk->sk_prot->socks, as this field was copied | |
1579 | * with memcpy). | |
1580 | * | |
1581 | * This _changes_ the previous behaviour, where | |
1582 | * tcp_create_openreq_child always was incrementing the | |
1583 | * equivalent to tcp_prot->socks (inet_sock_nr), so this have | |
1584 | * to be taken into account in all callers. -acme | |
1585 | */ | |
1586 | sk_refcnt_debug_inc(newsk); | |
972692e0 | 1587 | sk_set_socket(newsk, NULL); |
43815482 | 1588 | newsk->sk_wq = NULL; |
87d11ceb ACM |
1589 | |
1590 | if (newsk->sk_prot->sockets_allocated) | |
180d8cd9 | 1591 | sk_sockets_allocated_inc(newsk); |
704da560 | 1592 | |
080a270f HFS |
1593 | if (sock_needs_netstamp(sk) && |
1594 | newsk->sk_flags & SK_FLAGS_TIMESTAMP) | |
704da560 | 1595 | net_enable_timestamp(); |
87d11ceb ACM |
1596 | } |
1597 | out: | |
1598 | return newsk; | |
1599 | } | |
e56c57d0 | 1600 | EXPORT_SYMBOL_GPL(sk_clone_lock); |
87d11ceb | 1601 | |
94352d45 ACM |
1602 | void sk_free_unlock_clone(struct sock *sk) |
1603 | { | |
1604 | /* It is still raw copy of parent, so invalidate | |
1605 | * destructor and make plain sk_free() */ | |
1606 | sk->sk_destruct = NULL; | |
1607 | bh_unlock_sock(sk); | |
1608 | sk_free(sk); | |
1609 | } | |
1610 | EXPORT_SYMBOL_GPL(sk_free_unlock_clone); | |
1611 | ||
9958089a AK |
1612 | void sk_setup_caps(struct sock *sk, struct dst_entry *dst) |
1613 | { | |
d6a4e26a ED |
1614 | u32 max_segs = 1; |
1615 | ||
6bd4f355 | 1616 | sk_dst_set(sk, dst); |
9958089a AK |
1617 | sk->sk_route_caps = dst->dev->features; |
1618 | if (sk->sk_route_caps & NETIF_F_GSO) | |
4fcd6b99 | 1619 | sk->sk_route_caps |= NETIF_F_GSO_SOFTWARE; |
a465419b | 1620 | sk->sk_route_caps &= ~sk->sk_route_nocaps; |
9958089a | 1621 | if (sk_can_gso(sk)) { |
82cc1a7a | 1622 | if (dst->header_len) { |
9958089a | 1623 | sk->sk_route_caps &= ~NETIF_F_GSO_MASK; |
82cc1a7a | 1624 | } else { |
9958089a | 1625 | sk->sk_route_caps |= NETIF_F_SG | NETIF_F_HW_CSUM; |
82cc1a7a | 1626 | sk->sk_gso_max_size = dst->dev->gso_max_size; |
d6a4e26a | 1627 | max_segs = max_t(u32, dst->dev->gso_max_segs, 1); |
82cc1a7a | 1628 | } |
9958089a | 1629 | } |
d6a4e26a | 1630 | sk->sk_gso_max_segs = max_segs; |
9958089a AK |
1631 | } |
1632 | EXPORT_SYMBOL_GPL(sk_setup_caps); | |
1633 | ||
1da177e4 LT |
1634 | /* |
1635 | * Simple resource managers for sockets. | |
1636 | */ | |
1637 | ||
1638 | ||
4ec93edb YH |
1639 | /* |
1640 | * Write buffer destructor automatically called from kfree_skb. | |
1da177e4 LT |
1641 | */ |
1642 | void sock_wfree(struct sk_buff *skb) | |
1643 | { | |
1644 | struct sock *sk = skb->sk; | |
d99927f4 | 1645 | unsigned int len = skb->truesize; |
1da177e4 | 1646 | |
d99927f4 ED |
1647 | if (!sock_flag(sk, SOCK_USE_WRITE_QUEUE)) { |
1648 | /* | |
1649 | * Keep a reference on sk_wmem_alloc, this will be released | |
1650 | * after sk_write_space() call | |
1651 | */ | |
1652 | atomic_sub(len - 1, &sk->sk_wmem_alloc); | |
1da177e4 | 1653 | sk->sk_write_space(sk); |
d99927f4 ED |
1654 | len = 1; |
1655 | } | |
2b85a34e | 1656 | /* |
d99927f4 ED |
1657 | * if sk_wmem_alloc reaches 0, we must finish what sk_free() |
1658 | * could not do because of in-flight packets | |
2b85a34e | 1659 | */ |
d99927f4 | 1660 | if (atomic_sub_and_test(len, &sk->sk_wmem_alloc)) |
2b85a34e | 1661 | __sk_free(sk); |
1da177e4 | 1662 | } |
2a91525c | 1663 | EXPORT_SYMBOL(sock_wfree); |
1da177e4 | 1664 | |
1d2077ac ED |
1665 | /* This variant of sock_wfree() is used by TCP, |
1666 | * since it sets SOCK_USE_WRITE_QUEUE. | |
1667 | */ | |
1668 | void __sock_wfree(struct sk_buff *skb) | |
1669 | { | |
1670 | struct sock *sk = skb->sk; | |
1671 | ||
1672 | if (atomic_sub_and_test(skb->truesize, &sk->sk_wmem_alloc)) | |
1673 | __sk_free(sk); | |
1674 | } | |
1675 | ||
9e17f8a4 ED |
1676 | void skb_set_owner_w(struct sk_buff *skb, struct sock *sk) |
1677 | { | |
1678 | skb_orphan(skb); | |
1679 | skb->sk = sk; | |
1680 | #ifdef CONFIG_INET | |
1681 | if (unlikely(!sk_fullsock(sk))) { | |
1682 | skb->destructor = sock_edemux; | |
1683 | sock_hold(sk); | |
1684 | return; | |
1685 | } | |
1686 | #endif | |
1687 | skb->destructor = sock_wfree; | |
1688 | skb_set_hash_from_sk(skb, sk); | |
1689 | /* | |
1690 | * We used to take a refcount on sk, but following operation | |
1691 | * is enough to guarantee sk_free() wont free this sock until | |
1692 | * all in-flight packets are completed | |
1693 | */ | |
1694 | atomic_add(skb->truesize, &sk->sk_wmem_alloc); | |
1695 | } | |
1696 | EXPORT_SYMBOL(skb_set_owner_w); | |
1697 | ||
1d2077ac ED |
1698 | /* This helper is used by netem, as it can hold packets in its |
1699 | * delay queue. We want to allow the owner socket to send more | |
1700 | * packets, as if they were already TX completed by a typical driver. | |
1701 | * But we also want to keep skb->sk set because some packet schedulers | |
1702 | * rely on it (sch_fq for example). So we set skb->truesize to a small | |
1703 | * amount (1) and decrease sk_wmem_alloc accordingly. | |
1704 | */ | |
f2f872f9 ED |
1705 | void skb_orphan_partial(struct sk_buff *skb) |
1706 | { | |
1d2077ac ED |
1707 | /* If this skb is a TCP pure ACK or already went here, |
1708 | * we have nothing to do. 2 is already a very small truesize. | |
1709 | */ | |
1710 | if (skb->truesize <= 2) | |
1711 | return; | |
1712 | ||
f2f872f9 ED |
1713 | /* TCP stack sets skb->ooo_okay based on sk_wmem_alloc, |
1714 | * so we do not completely orphan skb, but transfert all | |
1715 | * accounted bytes but one, to avoid unexpected reorders. | |
1716 | */ | |
1717 | if (skb->destructor == sock_wfree | |
1718 | #ifdef CONFIG_INET | |
1719 | || skb->destructor == tcp_wfree | |
1720 | #endif | |
1721 | ) { | |
1722 | atomic_sub(skb->truesize - 1, &skb->sk->sk_wmem_alloc); | |
1723 | skb->truesize = 1; | |
1724 | } else { | |
1725 | skb_orphan(skb); | |
1726 | } | |
1727 | } | |
1728 | EXPORT_SYMBOL(skb_orphan_partial); | |
1729 | ||
4ec93edb YH |
1730 | /* |
1731 | * Read buffer destructor automatically called from kfree_skb. | |
1da177e4 LT |
1732 | */ |
1733 | void sock_rfree(struct sk_buff *skb) | |
1734 | { | |
1735 | struct sock *sk = skb->sk; | |
d361fd59 | 1736 | unsigned int len = skb->truesize; |
1da177e4 | 1737 | |
d361fd59 ED |
1738 | atomic_sub(len, &sk->sk_rmem_alloc); |
1739 | sk_mem_uncharge(sk, len); | |
1da177e4 | 1740 | } |
2a91525c | 1741 | EXPORT_SYMBOL(sock_rfree); |
1da177e4 | 1742 | |
7768eed8 OH |
1743 | /* |
1744 | * Buffer destructor for skbs that are not used directly in read or write | |
1745 | * path, e.g. for error handler skbs. Automatically called from kfree_skb. | |
1746 | */ | |
62bccb8c AD |
1747 | void sock_efree(struct sk_buff *skb) |
1748 | { | |
1749 | sock_put(skb->sk); | |
1750 | } | |
1751 | EXPORT_SYMBOL(sock_efree); | |
1752 | ||
976d0201 | 1753 | kuid_t sock_i_uid(struct sock *sk) |
1da177e4 | 1754 | { |
976d0201 | 1755 | kuid_t uid; |
1da177e4 | 1756 | |
f064af1e | 1757 | read_lock_bh(&sk->sk_callback_lock); |
976d0201 | 1758 | uid = sk->sk_socket ? SOCK_INODE(sk->sk_socket)->i_uid : GLOBAL_ROOT_UID; |
f064af1e | 1759 | read_unlock_bh(&sk->sk_callback_lock); |
1da177e4 LT |
1760 | return uid; |
1761 | } | |
2a91525c | 1762 | EXPORT_SYMBOL(sock_i_uid); |
1da177e4 LT |
1763 | |
1764 | unsigned long sock_i_ino(struct sock *sk) | |
1765 | { | |
1766 | unsigned long ino; | |
1767 | ||
f064af1e | 1768 | read_lock_bh(&sk->sk_callback_lock); |
1da177e4 | 1769 | ino = sk->sk_socket ? SOCK_INODE(sk->sk_socket)->i_ino : 0; |
f064af1e | 1770 | read_unlock_bh(&sk->sk_callback_lock); |
1da177e4 LT |
1771 | return ino; |
1772 | } | |
2a91525c | 1773 | EXPORT_SYMBOL(sock_i_ino); |
1da177e4 LT |
1774 | |
1775 | /* | |
1776 | * Allocate a skb from the socket's send buffer. | |
1777 | */ | |
86a76caf | 1778 | struct sk_buff *sock_wmalloc(struct sock *sk, unsigned long size, int force, |
dd0fc66f | 1779 | gfp_t priority) |
1da177e4 LT |
1780 | { |
1781 | if (force || atomic_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf) { | |
2a91525c | 1782 | struct sk_buff *skb = alloc_skb(size, priority); |
1da177e4 LT |
1783 | if (skb) { |
1784 | skb_set_owner_w(skb, sk); | |
1785 | return skb; | |
1786 | } | |
1787 | } | |
1788 | return NULL; | |
1789 | } | |
2a91525c | 1790 | EXPORT_SYMBOL(sock_wmalloc); |
1da177e4 | 1791 | |
4ec93edb | 1792 | /* |
1da177e4 | 1793 | * Allocate a memory block from the socket's option memory buffer. |
4ec93edb | 1794 | */ |
dd0fc66f | 1795 | void *sock_kmalloc(struct sock *sk, int size, gfp_t priority) |
1da177e4 | 1796 | { |
95c96174 | 1797 | if ((unsigned int)size <= sysctl_optmem_max && |
1da177e4 LT |
1798 | atomic_read(&sk->sk_omem_alloc) + size < sysctl_optmem_max) { |
1799 | void *mem; | |
1800 | /* First do the add, to avoid the race if kmalloc | |
4ec93edb | 1801 | * might sleep. |
1da177e4 LT |
1802 | */ |
1803 | atomic_add(size, &sk->sk_omem_alloc); | |
1804 | mem = kmalloc(size, priority); | |
1805 | if (mem) | |
1806 | return mem; | |
1807 | atomic_sub(size, &sk->sk_omem_alloc); | |
1808 | } | |
1809 | return NULL; | |
1810 | } | |
2a91525c | 1811 | EXPORT_SYMBOL(sock_kmalloc); |
1da177e4 | 1812 | |
79e88659 DB |
1813 | /* Free an option memory block. Note, we actually want the inline |
1814 | * here as this allows gcc to detect the nullify and fold away the | |
1815 | * condition entirely. | |
1da177e4 | 1816 | */ |
79e88659 DB |
1817 | static inline void __sock_kfree_s(struct sock *sk, void *mem, int size, |
1818 | const bool nullify) | |
1da177e4 | 1819 | { |
e53da5fb DM |
1820 | if (WARN_ON_ONCE(!mem)) |
1821 | return; | |
79e88659 DB |
1822 | if (nullify) |
1823 | kzfree(mem); | |
1824 | else | |
1825 | kfree(mem); | |
1da177e4 LT |
1826 | atomic_sub(size, &sk->sk_omem_alloc); |
1827 | } | |
79e88659 DB |
1828 | |
1829 | void sock_kfree_s(struct sock *sk, void *mem, int size) | |
1830 | { | |
1831 | __sock_kfree_s(sk, mem, size, false); | |
1832 | } | |
2a91525c | 1833 | EXPORT_SYMBOL(sock_kfree_s); |
1da177e4 | 1834 | |
79e88659 DB |
1835 | void sock_kzfree_s(struct sock *sk, void *mem, int size) |
1836 | { | |
1837 | __sock_kfree_s(sk, mem, size, true); | |
1838 | } | |
1839 | EXPORT_SYMBOL(sock_kzfree_s); | |
1840 | ||
1da177e4 LT |
1841 | /* It is almost wait_for_tcp_memory minus release_sock/lock_sock. |
1842 | I think, these locks should be removed for datagram sockets. | |
1843 | */ | |
2a91525c | 1844 | static long sock_wait_for_wmem(struct sock *sk, long timeo) |
1da177e4 LT |
1845 | { |
1846 | DEFINE_WAIT(wait); | |
1847 | ||
9cd3e072 | 1848 | sk_clear_bit(SOCKWQ_ASYNC_NOSPACE, sk); |
1da177e4 LT |
1849 | for (;;) { |
1850 | if (!timeo) | |
1851 | break; | |
1852 | if (signal_pending(current)) | |
1853 | break; | |
1854 | set_bit(SOCK_NOSPACE, &sk->sk_socket->flags); | |
aa395145 | 1855 | prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE); |
1da177e4 LT |
1856 | if (atomic_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf) |
1857 | break; | |
1858 | if (sk->sk_shutdown & SEND_SHUTDOWN) | |
1859 | break; | |
1860 | if (sk->sk_err) | |
1861 | break; | |
1862 | timeo = schedule_timeout(timeo); | |
1863 | } | |
aa395145 | 1864 | finish_wait(sk_sleep(sk), &wait); |
1da177e4 LT |
1865 | return timeo; |
1866 | } | |
1867 | ||
1868 | ||
1869 | /* | |
1870 | * Generic send/receive buffer handlers | |
1871 | */ | |
1872 | ||
4cc7f68d HX |
1873 | struct sk_buff *sock_alloc_send_pskb(struct sock *sk, unsigned long header_len, |
1874 | unsigned long data_len, int noblock, | |
28d64271 | 1875 | int *errcode, int max_page_order) |
1da177e4 | 1876 | { |
2e4e4410 | 1877 | struct sk_buff *skb; |
1da177e4 LT |
1878 | long timeo; |
1879 | int err; | |
1880 | ||
1da177e4 | 1881 | timeo = sock_sndtimeo(sk, noblock); |
2e4e4410 | 1882 | for (;;) { |
1da177e4 LT |
1883 | err = sock_error(sk); |
1884 | if (err != 0) | |
1885 | goto failure; | |
1886 | ||
1887 | err = -EPIPE; | |
1888 | if (sk->sk_shutdown & SEND_SHUTDOWN) | |
1889 | goto failure; | |
1890 | ||
2e4e4410 ED |
1891 | if (sk_wmem_alloc_get(sk) < sk->sk_sndbuf) |
1892 | break; | |
28d64271 | 1893 | |
9cd3e072 | 1894 | sk_set_bit(SOCKWQ_ASYNC_NOSPACE, sk); |
2e4e4410 ED |
1895 | set_bit(SOCK_NOSPACE, &sk->sk_socket->flags); |
1896 | err = -EAGAIN; | |
1897 | if (!timeo) | |
1da177e4 | 1898 | goto failure; |
2e4e4410 ED |
1899 | if (signal_pending(current)) |
1900 | goto interrupted; | |
1901 | timeo = sock_wait_for_wmem(sk, timeo); | |
1da177e4 | 1902 | } |
2e4e4410 ED |
1903 | skb = alloc_skb_with_frags(header_len, data_len, max_page_order, |
1904 | errcode, sk->sk_allocation); | |
1905 | if (skb) | |
1906 | skb_set_owner_w(skb, sk); | |
1da177e4 LT |
1907 | return skb; |
1908 | ||
1909 | interrupted: | |
1910 | err = sock_intr_errno(timeo); | |
1911 | failure: | |
1912 | *errcode = err; | |
1913 | return NULL; | |
1914 | } | |
4cc7f68d | 1915 | EXPORT_SYMBOL(sock_alloc_send_pskb); |
1da177e4 | 1916 | |
4ec93edb | 1917 | struct sk_buff *sock_alloc_send_skb(struct sock *sk, unsigned long size, |
1da177e4 LT |
1918 | int noblock, int *errcode) |
1919 | { | |
28d64271 | 1920 | return sock_alloc_send_pskb(sk, size, 0, noblock, errcode, 0); |
1da177e4 | 1921 | } |
2a91525c | 1922 | EXPORT_SYMBOL(sock_alloc_send_skb); |
1da177e4 | 1923 | |
39771b12 WB |
1924 | int __sock_cmsg_send(struct sock *sk, struct msghdr *msg, struct cmsghdr *cmsg, |
1925 | struct sockcm_cookie *sockc) | |
1926 | { | |
3dd17e63 SHY |
1927 | u32 tsflags; |
1928 | ||
39771b12 WB |
1929 | switch (cmsg->cmsg_type) { |
1930 | case SO_MARK: | |
1931 | if (!ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN)) | |
1932 | return -EPERM; | |
1933 | if (cmsg->cmsg_len != CMSG_LEN(sizeof(u32))) | |
1934 | return -EINVAL; | |
1935 | sockc->mark = *(u32 *)CMSG_DATA(cmsg); | |
1936 | break; | |
3dd17e63 SHY |
1937 | case SO_TIMESTAMPING: |
1938 | if (cmsg->cmsg_len != CMSG_LEN(sizeof(u32))) | |
1939 | return -EINVAL; | |
1940 | ||
1941 | tsflags = *(u32 *)CMSG_DATA(cmsg); | |
1942 | if (tsflags & ~SOF_TIMESTAMPING_TX_RECORD_MASK) | |
1943 | return -EINVAL; | |
1944 | ||
1945 | sockc->tsflags &= ~SOF_TIMESTAMPING_TX_RECORD_MASK; | |
1946 | sockc->tsflags |= tsflags; | |
1947 | break; | |
779f1ede SHY |
1948 | /* SCM_RIGHTS and SCM_CREDENTIALS are semantically in SOL_UNIX. */ |
1949 | case SCM_RIGHTS: | |
1950 | case SCM_CREDENTIALS: | |
1951 | break; | |
39771b12 WB |
1952 | default: |
1953 | return -EINVAL; | |
1954 | } | |
1955 | return 0; | |
1956 | } | |
1957 | EXPORT_SYMBOL(__sock_cmsg_send); | |
1958 | ||
f28ea365 EJ |
1959 | int sock_cmsg_send(struct sock *sk, struct msghdr *msg, |
1960 | struct sockcm_cookie *sockc) | |
1961 | { | |
1962 | struct cmsghdr *cmsg; | |
39771b12 | 1963 | int ret; |
f28ea365 EJ |
1964 | |
1965 | for_each_cmsghdr(cmsg, msg) { | |
1966 | if (!CMSG_OK(msg, cmsg)) | |
1967 | return -EINVAL; | |
1968 | if (cmsg->cmsg_level != SOL_SOCKET) | |
1969 | continue; | |
39771b12 WB |
1970 | ret = __sock_cmsg_send(sk, msg, cmsg, sockc); |
1971 | if (ret) | |
1972 | return ret; | |
f28ea365 EJ |
1973 | } |
1974 | return 0; | |
1975 | } | |
1976 | EXPORT_SYMBOL(sock_cmsg_send); | |
1977 | ||
5640f768 ED |
1978 | /* On 32bit arches, an skb frag is limited to 2^15 */ |
1979 | #define SKB_FRAG_PAGE_ORDER get_order(32768) | |
1980 | ||
400dfd3a ED |
1981 | /** |
1982 | * skb_page_frag_refill - check that a page_frag contains enough room | |
1983 | * @sz: minimum size of the fragment we want to get | |
1984 | * @pfrag: pointer to page_frag | |
82d5e2b8 | 1985 | * @gfp: priority for memory allocation |
400dfd3a ED |
1986 | * |
1987 | * Note: While this allocator tries to use high order pages, there is | |
1988 | * no guarantee that allocations succeed. Therefore, @sz MUST be | |
1989 | * less or equal than PAGE_SIZE. | |
1990 | */ | |
d9b2938a | 1991 | bool skb_page_frag_refill(unsigned int sz, struct page_frag *pfrag, gfp_t gfp) |
5640f768 | 1992 | { |
5640f768 | 1993 | if (pfrag->page) { |
fe896d18 | 1994 | if (page_ref_count(pfrag->page) == 1) { |
5640f768 ED |
1995 | pfrag->offset = 0; |
1996 | return true; | |
1997 | } | |
400dfd3a | 1998 | if (pfrag->offset + sz <= pfrag->size) |
5640f768 ED |
1999 | return true; |
2000 | put_page(pfrag->page); | |
2001 | } | |
2002 | ||
d9b2938a ED |
2003 | pfrag->offset = 0; |
2004 | if (SKB_FRAG_PAGE_ORDER) { | |
d0164adc MG |
2005 | /* Avoid direct reclaim but allow kswapd to wake */ |
2006 | pfrag->page = alloc_pages((gfp & ~__GFP_DIRECT_RECLAIM) | | |
2007 | __GFP_COMP | __GFP_NOWARN | | |
2008 | __GFP_NORETRY, | |
d9b2938a | 2009 | SKB_FRAG_PAGE_ORDER); |
5640f768 | 2010 | if (likely(pfrag->page)) { |
d9b2938a | 2011 | pfrag->size = PAGE_SIZE << SKB_FRAG_PAGE_ORDER; |
5640f768 ED |
2012 | return true; |
2013 | } | |
d9b2938a ED |
2014 | } |
2015 | pfrag->page = alloc_page(gfp); | |
2016 | if (likely(pfrag->page)) { | |
2017 | pfrag->size = PAGE_SIZE; | |
2018 | return true; | |
2019 | } | |
400dfd3a ED |
2020 | return false; |
2021 | } | |
2022 | EXPORT_SYMBOL(skb_page_frag_refill); | |
2023 | ||
2024 | bool sk_page_frag_refill(struct sock *sk, struct page_frag *pfrag) | |
2025 | { | |
2026 | if (likely(skb_page_frag_refill(32U, pfrag, sk->sk_allocation))) | |
2027 | return true; | |
2028 | ||
5640f768 ED |
2029 | sk_enter_memory_pressure(sk); |
2030 | sk_stream_moderate_sndbuf(sk); | |
2031 | return false; | |
2032 | } | |
2033 | EXPORT_SYMBOL(sk_page_frag_refill); | |
2034 | ||
1da177e4 | 2035 | static void __lock_sock(struct sock *sk) |
f39234d6 NK |
2036 | __releases(&sk->sk_lock.slock) |
2037 | __acquires(&sk->sk_lock.slock) | |
1da177e4 LT |
2038 | { |
2039 | DEFINE_WAIT(wait); | |
2040 | ||
e71a4783 | 2041 | for (;;) { |
1da177e4 LT |
2042 | prepare_to_wait_exclusive(&sk->sk_lock.wq, &wait, |
2043 | TASK_UNINTERRUPTIBLE); | |
2044 | spin_unlock_bh(&sk->sk_lock.slock); | |
2045 | schedule(); | |
2046 | spin_lock_bh(&sk->sk_lock.slock); | |
e71a4783 | 2047 | if (!sock_owned_by_user(sk)) |
1da177e4 LT |
2048 | break; |
2049 | } | |
2050 | finish_wait(&sk->sk_lock.wq, &wait); | |
2051 | } | |
2052 | ||
2053 | static void __release_sock(struct sock *sk) | |
f39234d6 NK |
2054 | __releases(&sk->sk_lock.slock) |
2055 | __acquires(&sk->sk_lock.slock) | |
1da177e4 | 2056 | { |
5413d1ba | 2057 | struct sk_buff *skb, *next; |
1da177e4 | 2058 | |
5413d1ba | 2059 | while ((skb = sk->sk_backlog.head) != NULL) { |
1da177e4 | 2060 | sk->sk_backlog.head = sk->sk_backlog.tail = NULL; |
1da177e4 | 2061 | |
5413d1ba | 2062 | spin_unlock_bh(&sk->sk_lock.slock); |
1da177e4 | 2063 | |
5413d1ba ED |
2064 | do { |
2065 | next = skb->next; | |
e4cbb02a | 2066 | prefetch(next); |
7fee226a | 2067 | WARN_ON_ONCE(skb_dst_is_noref(skb)); |
1da177e4 | 2068 | skb->next = NULL; |
c57943a1 | 2069 | sk_backlog_rcv(sk, skb); |
1da177e4 | 2070 | |
5413d1ba | 2071 | cond_resched(); |
1da177e4 LT |
2072 | |
2073 | skb = next; | |
2074 | } while (skb != NULL); | |
2075 | ||
5413d1ba ED |
2076 | spin_lock_bh(&sk->sk_lock.slock); |
2077 | } | |
8eae939f ZY |
2078 | |
2079 | /* | |
2080 | * Doing the zeroing here guarantee we can not loop forever | |
2081 | * while a wild producer attempts to flood us. | |
2082 | */ | |
2083 | sk->sk_backlog.len = 0; | |
1da177e4 LT |
2084 | } |
2085 | ||
d41a69f1 ED |
2086 | void __sk_flush_backlog(struct sock *sk) |
2087 | { | |
2088 | spin_lock_bh(&sk->sk_lock.slock); | |
2089 | __release_sock(sk); | |
2090 | spin_unlock_bh(&sk->sk_lock.slock); | |
2091 | } | |
2092 | ||
1da177e4 LT |
2093 | /** |
2094 | * sk_wait_data - wait for data to arrive at sk_receive_queue | |
4dc3b16b PP |
2095 | * @sk: sock to wait on |
2096 | * @timeo: for how long | |
dfbafc99 | 2097 | * @skb: last skb seen on sk_receive_queue |
1da177e4 LT |
2098 | * |
2099 | * Now socket state including sk->sk_err is changed only under lock, | |
2100 | * hence we may omit checks after joining wait queue. | |
2101 | * We check receive queue before schedule() only as optimization; | |
2102 | * it is very likely that release_sock() added new data. | |
2103 | */ | |
dfbafc99 | 2104 | int sk_wait_data(struct sock *sk, long *timeo, const struct sk_buff *skb) |
1da177e4 | 2105 | { |
d9dc8b0f | 2106 | DEFINE_WAIT_FUNC(wait, woken_wake_function); |
1da177e4 | 2107 | int rc; |
1da177e4 | 2108 | |
d9dc8b0f | 2109 | add_wait_queue(sk_sleep(sk), &wait); |
9cd3e072 | 2110 | sk_set_bit(SOCKWQ_ASYNC_WAITDATA, sk); |
d9dc8b0f | 2111 | rc = sk_wait_event(sk, timeo, skb_peek_tail(&sk->sk_receive_queue) != skb, &wait); |
9cd3e072 | 2112 | sk_clear_bit(SOCKWQ_ASYNC_WAITDATA, sk); |
d9dc8b0f | 2113 | remove_wait_queue(sk_sleep(sk), &wait); |
1da177e4 LT |
2114 | return rc; |
2115 | } | |
1da177e4 LT |
2116 | EXPORT_SYMBOL(sk_wait_data); |
2117 | ||
3ab224be | 2118 | /** |
f8c3bf00 | 2119 | * __sk_mem_raise_allocated - increase memory_allocated |
3ab224be HA |
2120 | * @sk: socket |
2121 | * @size: memory size to allocate | |
f8c3bf00 | 2122 | * @amt: pages to allocate |
3ab224be HA |
2123 | * @kind: allocation type |
2124 | * | |
f8c3bf00 | 2125 | * Similar to __sk_mem_schedule(), but does not update sk_forward_alloc |
3ab224be | 2126 | */ |
f8c3bf00 | 2127 | int __sk_mem_raise_allocated(struct sock *sk, int size, int amt, int kind) |
3ab224be HA |
2128 | { |
2129 | struct proto *prot = sk->sk_prot; | |
f8c3bf00 | 2130 | long allocated = sk_memory_allocated_add(sk, amt); |
e805605c | 2131 | |
baac50bb JW |
2132 | if (mem_cgroup_sockets_enabled && sk->sk_memcg && |
2133 | !mem_cgroup_charge_skmem(sk->sk_memcg, amt)) | |
e805605c | 2134 | goto suppress_allocation; |
3ab224be HA |
2135 | |
2136 | /* Under limit. */ | |
e805605c | 2137 | if (allocated <= sk_prot_mem_limits(sk, 0)) { |
180d8cd9 | 2138 | sk_leave_memory_pressure(sk); |
3ab224be HA |
2139 | return 1; |
2140 | } | |
2141 | ||
e805605c JW |
2142 | /* Under pressure. */ |
2143 | if (allocated > sk_prot_mem_limits(sk, 1)) | |
180d8cd9 | 2144 | sk_enter_memory_pressure(sk); |
3ab224be | 2145 | |
e805605c JW |
2146 | /* Over hard limit. */ |
2147 | if (allocated > sk_prot_mem_limits(sk, 2)) | |
3ab224be HA |
2148 | goto suppress_allocation; |
2149 | ||
2150 | /* guarantee minimum buffer size under pressure */ | |
2151 | if (kind == SK_MEM_RECV) { | |
2152 | if (atomic_read(&sk->sk_rmem_alloc) < prot->sysctl_rmem[0]) | |
2153 | return 1; | |
180d8cd9 | 2154 | |
3ab224be HA |
2155 | } else { /* SK_MEM_SEND */ |
2156 | if (sk->sk_type == SOCK_STREAM) { | |
2157 | if (sk->sk_wmem_queued < prot->sysctl_wmem[0]) | |
2158 | return 1; | |
2159 | } else if (atomic_read(&sk->sk_wmem_alloc) < | |
2160 | prot->sysctl_wmem[0]) | |
2161 | return 1; | |
2162 | } | |
2163 | ||
180d8cd9 | 2164 | if (sk_has_memory_pressure(sk)) { |
1748376b ED |
2165 | int alloc; |
2166 | ||
180d8cd9 | 2167 | if (!sk_under_memory_pressure(sk)) |
1748376b | 2168 | return 1; |
180d8cd9 GC |
2169 | alloc = sk_sockets_allocated_read_positive(sk); |
2170 | if (sk_prot_mem_limits(sk, 2) > alloc * | |
3ab224be HA |
2171 | sk_mem_pages(sk->sk_wmem_queued + |
2172 | atomic_read(&sk->sk_rmem_alloc) + | |
2173 | sk->sk_forward_alloc)) | |
2174 | return 1; | |
2175 | } | |
2176 | ||
2177 | suppress_allocation: | |
2178 | ||
2179 | if (kind == SK_MEM_SEND && sk->sk_type == SOCK_STREAM) { | |
2180 | sk_stream_moderate_sndbuf(sk); | |
2181 | ||
2182 | /* Fail only if socket is _under_ its sndbuf. | |
2183 | * In this case we cannot block, so that we have to fail. | |
2184 | */ | |
2185 | if (sk->sk_wmem_queued + size >= sk->sk_sndbuf) | |
2186 | return 1; | |
2187 | } | |
2188 | ||
3847ce32 SM |
2189 | trace_sock_exceed_buf_limit(sk, prot, allocated); |
2190 | ||
0e90b31f | 2191 | sk_memory_allocated_sub(sk, amt); |
180d8cd9 | 2192 | |
baac50bb JW |
2193 | if (mem_cgroup_sockets_enabled && sk->sk_memcg) |
2194 | mem_cgroup_uncharge_skmem(sk->sk_memcg, amt); | |
e805605c | 2195 | |
3ab224be HA |
2196 | return 0; |
2197 | } | |
f8c3bf00 PA |
2198 | EXPORT_SYMBOL(__sk_mem_raise_allocated); |
2199 | ||
2200 | /** | |
2201 | * __sk_mem_schedule - increase sk_forward_alloc and memory_allocated | |
2202 | * @sk: socket | |
2203 | * @size: memory size to allocate | |
2204 | * @kind: allocation type | |
2205 | * | |
2206 | * If kind is SK_MEM_SEND, it means wmem allocation. Otherwise it means | |
2207 | * rmem allocation. This function assumes that protocols which have | |
2208 | * memory_pressure use sk_wmem_queued as write buffer accounting. | |
2209 | */ | |
2210 | int __sk_mem_schedule(struct sock *sk, int size, int kind) | |
2211 | { | |
2212 | int ret, amt = sk_mem_pages(size); | |
2213 | ||
2214 | sk->sk_forward_alloc += amt << SK_MEM_QUANTUM_SHIFT; | |
2215 | ret = __sk_mem_raise_allocated(sk, size, amt, kind); | |
2216 | if (!ret) | |
2217 | sk->sk_forward_alloc -= amt << SK_MEM_QUANTUM_SHIFT; | |
2218 | return ret; | |
2219 | } | |
3ab224be HA |
2220 | EXPORT_SYMBOL(__sk_mem_schedule); |
2221 | ||
2222 | /** | |
f8c3bf00 | 2223 | * __sk_mem_reduce_allocated - reclaim memory_allocated |
3ab224be | 2224 | * @sk: socket |
f8c3bf00 PA |
2225 | * @amount: number of quanta |
2226 | * | |
2227 | * Similar to __sk_mem_reclaim(), but does not update sk_forward_alloc | |
3ab224be | 2228 | */ |
f8c3bf00 | 2229 | void __sk_mem_reduce_allocated(struct sock *sk, int amount) |
3ab224be | 2230 | { |
1a24e04e | 2231 | sk_memory_allocated_sub(sk, amount); |
3ab224be | 2232 | |
baac50bb JW |
2233 | if (mem_cgroup_sockets_enabled && sk->sk_memcg) |
2234 | mem_cgroup_uncharge_skmem(sk->sk_memcg, amount); | |
e805605c | 2235 | |
180d8cd9 GC |
2236 | if (sk_under_memory_pressure(sk) && |
2237 | (sk_memory_allocated(sk) < sk_prot_mem_limits(sk, 0))) | |
2238 | sk_leave_memory_pressure(sk); | |
3ab224be | 2239 | } |
f8c3bf00 PA |
2240 | EXPORT_SYMBOL(__sk_mem_reduce_allocated); |
2241 | ||
2242 | /** | |
2243 | * __sk_mem_reclaim - reclaim sk_forward_alloc and memory_allocated | |
2244 | * @sk: socket | |
2245 | * @amount: number of bytes (rounded down to a SK_MEM_QUANTUM multiple) | |
2246 | */ | |
2247 | void __sk_mem_reclaim(struct sock *sk, int amount) | |
2248 | { | |
2249 | amount >>= SK_MEM_QUANTUM_SHIFT; | |
2250 | sk->sk_forward_alloc -= amount << SK_MEM_QUANTUM_SHIFT; | |
2251 | __sk_mem_reduce_allocated(sk, amount); | |
2252 | } | |
3ab224be HA |
2253 | EXPORT_SYMBOL(__sk_mem_reclaim); |
2254 | ||
627d2d6b | 2255 | int sk_set_peek_off(struct sock *sk, int val) |
2256 | { | |
2257 | if (val < 0) | |
2258 | return -EINVAL; | |
2259 | ||
2260 | sk->sk_peek_off = val; | |
2261 | return 0; | |
2262 | } | |
2263 | EXPORT_SYMBOL_GPL(sk_set_peek_off); | |
3ab224be | 2264 | |
1da177e4 LT |
2265 | /* |
2266 | * Set of default routines for initialising struct proto_ops when | |
2267 | * the protocol does not support a particular function. In certain | |
2268 | * cases where it makes no sense for a protocol to have a "do nothing" | |
2269 | * function, some default processing is provided. | |
2270 | */ | |
2271 | ||
2272 | int sock_no_bind(struct socket *sock, struct sockaddr *saddr, int len) | |
2273 | { | |
2274 | return -EOPNOTSUPP; | |
2275 | } | |
2a91525c | 2276 | EXPORT_SYMBOL(sock_no_bind); |
1da177e4 | 2277 | |
4ec93edb | 2278 | int sock_no_connect(struct socket *sock, struct sockaddr *saddr, |
1da177e4 LT |
2279 | int len, int flags) |
2280 | { | |
2281 | return -EOPNOTSUPP; | |
2282 | } | |
2a91525c | 2283 | EXPORT_SYMBOL(sock_no_connect); |
1da177e4 LT |
2284 | |
2285 | int sock_no_socketpair(struct socket *sock1, struct socket *sock2) | |
2286 | { | |
2287 | return -EOPNOTSUPP; | |
2288 | } | |
2a91525c | 2289 | EXPORT_SYMBOL(sock_no_socketpair); |
1da177e4 | 2290 | |
cdfbabfb DH |
2291 | int sock_no_accept(struct socket *sock, struct socket *newsock, int flags, |
2292 | bool kern) | |
1da177e4 LT |
2293 | { |
2294 | return -EOPNOTSUPP; | |
2295 | } | |
2a91525c | 2296 | EXPORT_SYMBOL(sock_no_accept); |
1da177e4 | 2297 | |
4ec93edb | 2298 | int sock_no_getname(struct socket *sock, struct sockaddr *saddr, |
1da177e4 LT |
2299 | int *len, int peer) |
2300 | { | |
2301 | return -EOPNOTSUPP; | |
2302 | } | |
2a91525c | 2303 | EXPORT_SYMBOL(sock_no_getname); |
1da177e4 | 2304 | |
2a91525c | 2305 | unsigned int sock_no_poll(struct file *file, struct socket *sock, poll_table *pt) |
1da177e4 LT |
2306 | { |
2307 | return 0; | |
2308 | } | |
2a91525c | 2309 | EXPORT_SYMBOL(sock_no_poll); |
1da177e4 LT |
2310 | |
2311 | int sock_no_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg) | |
2312 | { | |
2313 | return -EOPNOTSUPP; | |
2314 | } | |
2a91525c | 2315 | EXPORT_SYMBOL(sock_no_ioctl); |
1da177e4 LT |
2316 | |
2317 | int sock_no_listen(struct socket *sock, int backlog) | |
2318 | { | |
2319 | return -EOPNOTSUPP; | |
2320 | } | |
2a91525c | 2321 | EXPORT_SYMBOL(sock_no_listen); |
1da177e4 LT |
2322 | |
2323 | int sock_no_shutdown(struct socket *sock, int how) | |
2324 | { | |
2325 | return -EOPNOTSUPP; | |
2326 | } | |
2a91525c | 2327 | EXPORT_SYMBOL(sock_no_shutdown); |
1da177e4 LT |
2328 | |
2329 | int sock_no_setsockopt(struct socket *sock, int level, int optname, | |
b7058842 | 2330 | char __user *optval, unsigned int optlen) |
1da177e4 LT |
2331 | { |
2332 | return -EOPNOTSUPP; | |
2333 | } | |
2a91525c | 2334 | EXPORT_SYMBOL(sock_no_setsockopt); |
1da177e4 LT |
2335 | |
2336 | int sock_no_getsockopt(struct socket *sock, int level, int optname, | |
2337 | char __user *optval, int __user *optlen) | |
2338 | { | |
2339 | return -EOPNOTSUPP; | |
2340 | } | |
2a91525c | 2341 | EXPORT_SYMBOL(sock_no_getsockopt); |
1da177e4 | 2342 | |
1b784140 | 2343 | int sock_no_sendmsg(struct socket *sock, struct msghdr *m, size_t len) |
1da177e4 LT |
2344 | { |
2345 | return -EOPNOTSUPP; | |
2346 | } | |
2a91525c | 2347 | EXPORT_SYMBOL(sock_no_sendmsg); |
1da177e4 | 2348 | |
1b784140 YX |
2349 | int sock_no_recvmsg(struct socket *sock, struct msghdr *m, size_t len, |
2350 | int flags) | |
1da177e4 LT |
2351 | { |
2352 | return -EOPNOTSUPP; | |
2353 | } | |
2a91525c | 2354 | EXPORT_SYMBOL(sock_no_recvmsg); |
1da177e4 LT |
2355 | |
2356 | int sock_no_mmap(struct file *file, struct socket *sock, struct vm_area_struct *vma) | |
2357 | { | |
2358 | /* Mirror missing mmap method error code */ | |
2359 | return -ENODEV; | |
2360 | } | |
2a91525c | 2361 | EXPORT_SYMBOL(sock_no_mmap); |
1da177e4 LT |
2362 | |
2363 | ssize_t sock_no_sendpage(struct socket *sock, struct page *page, int offset, size_t size, int flags) | |
2364 | { | |
2365 | ssize_t res; | |
2366 | struct msghdr msg = {.msg_flags = flags}; | |
2367 | struct kvec iov; | |
2368 | char *kaddr = kmap(page); | |
2369 | iov.iov_base = kaddr + offset; | |
2370 | iov.iov_len = size; | |
2371 | res = kernel_sendmsg(sock, &msg, &iov, 1, size); | |
2372 | kunmap(page); | |
2373 | return res; | |
2374 | } | |
2a91525c | 2375 | EXPORT_SYMBOL(sock_no_sendpage); |
1da177e4 LT |
2376 | |
2377 | /* | |
2378 | * Default Socket Callbacks | |
2379 | */ | |
2380 | ||
2381 | static void sock_def_wakeup(struct sock *sk) | |
2382 | { | |
43815482 ED |
2383 | struct socket_wq *wq; |
2384 | ||
2385 | rcu_read_lock(); | |
2386 | wq = rcu_dereference(sk->sk_wq); | |
1ce0bf50 | 2387 | if (skwq_has_sleeper(wq)) |
43815482 ED |
2388 | wake_up_interruptible_all(&wq->wait); |
2389 | rcu_read_unlock(); | |
1da177e4 LT |
2390 | } |
2391 | ||
2392 | static void sock_def_error_report(struct sock *sk) | |
2393 | { | |
43815482 ED |
2394 | struct socket_wq *wq; |
2395 | ||
2396 | rcu_read_lock(); | |
2397 | wq = rcu_dereference(sk->sk_wq); | |
1ce0bf50 | 2398 | if (skwq_has_sleeper(wq)) |
43815482 | 2399 | wake_up_interruptible_poll(&wq->wait, POLLERR); |
8d8ad9d7 | 2400 | sk_wake_async(sk, SOCK_WAKE_IO, POLL_ERR); |
43815482 | 2401 | rcu_read_unlock(); |
1da177e4 LT |
2402 | } |
2403 | ||
676d2369 | 2404 | static void sock_def_readable(struct sock *sk) |
1da177e4 | 2405 | { |
43815482 ED |
2406 | struct socket_wq *wq; |
2407 | ||
2408 | rcu_read_lock(); | |
2409 | wq = rcu_dereference(sk->sk_wq); | |
1ce0bf50 | 2410 | if (skwq_has_sleeper(wq)) |
2c6607c6 | 2411 | wake_up_interruptible_sync_poll(&wq->wait, POLLIN | POLLPRI | |
37e5540b | 2412 | POLLRDNORM | POLLRDBAND); |
8d8ad9d7 | 2413 | sk_wake_async(sk, SOCK_WAKE_WAITD, POLL_IN); |
43815482 | 2414 | rcu_read_unlock(); |
1da177e4 LT |
2415 | } |
2416 | ||
2417 | static void sock_def_write_space(struct sock *sk) | |
2418 | { | |
43815482 ED |
2419 | struct socket_wq *wq; |
2420 | ||
2421 | rcu_read_lock(); | |
1da177e4 LT |
2422 | |
2423 | /* Do not wake up a writer until he can make "significant" | |
2424 | * progress. --DaveM | |
2425 | */ | |
e71a4783 | 2426 | if ((atomic_read(&sk->sk_wmem_alloc) << 1) <= sk->sk_sndbuf) { |
43815482 | 2427 | wq = rcu_dereference(sk->sk_wq); |
1ce0bf50 | 2428 | if (skwq_has_sleeper(wq)) |
43815482 | 2429 | wake_up_interruptible_sync_poll(&wq->wait, POLLOUT | |
37e5540b | 2430 | POLLWRNORM | POLLWRBAND); |
1da177e4 LT |
2431 | |
2432 | /* Should agree with poll, otherwise some programs break */ | |
2433 | if (sock_writeable(sk)) | |
8d8ad9d7 | 2434 | sk_wake_async(sk, SOCK_WAKE_SPACE, POLL_OUT); |
1da177e4 LT |
2435 | } |
2436 | ||
43815482 | 2437 | rcu_read_unlock(); |
1da177e4 LT |
2438 | } |
2439 | ||
2440 | static void sock_def_destruct(struct sock *sk) | |
2441 | { | |
1da177e4 LT |
2442 | } |
2443 | ||
2444 | void sk_send_sigurg(struct sock *sk) | |
2445 | { | |
2446 | if (sk->sk_socket && sk->sk_socket->file) | |
2447 | if (send_sigurg(&sk->sk_socket->file->f_owner)) | |
8d8ad9d7 | 2448 | sk_wake_async(sk, SOCK_WAKE_URG, POLL_PRI); |
1da177e4 | 2449 | } |
2a91525c | 2450 | EXPORT_SYMBOL(sk_send_sigurg); |
1da177e4 LT |
2451 | |
2452 | void sk_reset_timer(struct sock *sk, struct timer_list* timer, | |
2453 | unsigned long expires) | |
2454 | { | |
2455 | if (!mod_timer(timer, expires)) | |
2456 | sock_hold(sk); | |
2457 | } | |
1da177e4 LT |
2458 | EXPORT_SYMBOL(sk_reset_timer); |
2459 | ||
2460 | void sk_stop_timer(struct sock *sk, struct timer_list* timer) | |
2461 | { | |
25cc4ae9 | 2462 | if (del_timer(timer)) |
1da177e4 LT |
2463 | __sock_put(sk); |
2464 | } | |
1da177e4 LT |
2465 | EXPORT_SYMBOL(sk_stop_timer); |
2466 | ||
2467 | void sock_init_data(struct socket *sock, struct sock *sk) | |
2468 | { | |
2469 | skb_queue_head_init(&sk->sk_receive_queue); | |
2470 | skb_queue_head_init(&sk->sk_write_queue); | |
2471 | skb_queue_head_init(&sk->sk_error_queue); | |
2472 | ||
2473 | sk->sk_send_head = NULL; | |
2474 | ||
2475 | init_timer(&sk->sk_timer); | |
4ec93edb | 2476 | |
1da177e4 LT |
2477 | sk->sk_allocation = GFP_KERNEL; |
2478 | sk->sk_rcvbuf = sysctl_rmem_default; | |
2479 | sk->sk_sndbuf = sysctl_wmem_default; | |
2480 | sk->sk_state = TCP_CLOSE; | |
972692e0 | 2481 | sk_set_socket(sk, sock); |
1da177e4 LT |
2482 | |
2483 | sock_set_flag(sk, SOCK_ZAPPED); | |
2484 | ||
e71a4783 | 2485 | if (sock) { |
1da177e4 | 2486 | sk->sk_type = sock->type; |
43815482 | 2487 | sk->sk_wq = sock->wq; |
1da177e4 | 2488 | sock->sk = sk; |
86741ec2 LC |
2489 | sk->sk_uid = SOCK_INODE(sock)->i_uid; |
2490 | } else { | |
43815482 | 2491 | sk->sk_wq = NULL; |
86741ec2 LC |
2492 | sk->sk_uid = make_kuid(sock_net(sk)->user_ns, 0); |
2493 | } | |
1da177e4 | 2494 | |
1da177e4 | 2495 | rwlock_init(&sk->sk_callback_lock); |
cdfbabfb DH |
2496 | if (sk->sk_kern_sock) |
2497 | lockdep_set_class_and_name( | |
2498 | &sk->sk_callback_lock, | |
2499 | af_kern_callback_keys + sk->sk_family, | |
2500 | af_family_kern_clock_key_strings[sk->sk_family]); | |
2501 | else | |
2502 | lockdep_set_class_and_name( | |
2503 | &sk->sk_callback_lock, | |
443aef0e PZ |
2504 | af_callback_keys + sk->sk_family, |
2505 | af_family_clock_key_strings[sk->sk_family]); | |
1da177e4 LT |
2506 | |
2507 | sk->sk_state_change = sock_def_wakeup; | |
2508 | sk->sk_data_ready = sock_def_readable; | |
2509 | sk->sk_write_space = sock_def_write_space; | |
2510 | sk->sk_error_report = sock_def_error_report; | |
2511 | sk->sk_destruct = sock_def_destruct; | |
2512 | ||
5640f768 ED |
2513 | sk->sk_frag.page = NULL; |
2514 | sk->sk_frag.offset = 0; | |
ef64a54f | 2515 | sk->sk_peek_off = -1; |
1da177e4 | 2516 | |
109f6e39 EB |
2517 | sk->sk_peer_pid = NULL; |
2518 | sk->sk_peer_cred = NULL; | |
1da177e4 LT |
2519 | sk->sk_write_pending = 0; |
2520 | sk->sk_rcvlowat = 1; | |
2521 | sk->sk_rcvtimeo = MAX_SCHEDULE_TIMEOUT; | |
2522 | sk->sk_sndtimeo = MAX_SCHEDULE_TIMEOUT; | |
2523 | ||
f37f0afb | 2524 | sk->sk_stamp = ktime_set(-1L, 0); |
1da177e4 | 2525 | |
e0d1095a | 2526 | #ifdef CONFIG_NET_RX_BUSY_POLL |
06021292 | 2527 | sk->sk_napi_id = 0; |
64b0dc51 | 2528 | sk->sk_ll_usec = sysctl_net_busy_read; |
06021292 ET |
2529 | #endif |
2530 | ||
62748f32 | 2531 | sk->sk_max_pacing_rate = ~0U; |
7eec4174 | 2532 | sk->sk_pacing_rate = ~0U; |
70da268b | 2533 | sk->sk_incoming_cpu = -1; |
4dc6dc71 ED |
2534 | /* |
2535 | * Before updating sk_refcnt, we must commit prior changes to memory | |
2536 | * (Documentation/RCU/rculist_nulls.txt for details) | |
2537 | */ | |
2538 | smp_wmb(); | |
1da177e4 | 2539 | atomic_set(&sk->sk_refcnt, 1); |
33c732c3 | 2540 | atomic_set(&sk->sk_drops, 0); |
1da177e4 | 2541 | } |
2a91525c | 2542 | EXPORT_SYMBOL(sock_init_data); |
1da177e4 | 2543 | |
b5606c2d | 2544 | void lock_sock_nested(struct sock *sk, int subclass) |
1da177e4 LT |
2545 | { |
2546 | might_sleep(); | |
a5b5bb9a | 2547 | spin_lock_bh(&sk->sk_lock.slock); |
d2e9117c | 2548 | if (sk->sk_lock.owned) |
1da177e4 | 2549 | __lock_sock(sk); |
d2e9117c | 2550 | sk->sk_lock.owned = 1; |
a5b5bb9a IM |
2551 | spin_unlock(&sk->sk_lock.slock); |
2552 | /* | |
2553 | * The sk_lock has mutex_lock() semantics here: | |
2554 | */ | |
fcc70d5f | 2555 | mutex_acquire(&sk->sk_lock.dep_map, subclass, 0, _RET_IP_); |
a5b5bb9a | 2556 | local_bh_enable(); |
1da177e4 | 2557 | } |
fcc70d5f | 2558 | EXPORT_SYMBOL(lock_sock_nested); |
1da177e4 | 2559 | |
b5606c2d | 2560 | void release_sock(struct sock *sk) |
1da177e4 | 2561 | { |
a5b5bb9a | 2562 | spin_lock_bh(&sk->sk_lock.slock); |
1da177e4 LT |
2563 | if (sk->sk_backlog.tail) |
2564 | __release_sock(sk); | |
46d3ceab | 2565 | |
c3f9b018 ED |
2566 | /* Warning : release_cb() might need to release sk ownership, |
2567 | * ie call sock_release_ownership(sk) before us. | |
2568 | */ | |
46d3ceab ED |
2569 | if (sk->sk_prot->release_cb) |
2570 | sk->sk_prot->release_cb(sk); | |
2571 | ||
c3f9b018 | 2572 | sock_release_ownership(sk); |
a5b5bb9a IM |
2573 | if (waitqueue_active(&sk->sk_lock.wq)) |
2574 | wake_up(&sk->sk_lock.wq); | |
2575 | spin_unlock_bh(&sk->sk_lock.slock); | |
1da177e4 LT |
2576 | } |
2577 | EXPORT_SYMBOL(release_sock); | |
2578 | ||
8a74ad60 ED |
2579 | /** |
2580 | * lock_sock_fast - fast version of lock_sock | |
2581 | * @sk: socket | |
2582 | * | |
2583 | * This version should be used for very small section, where process wont block | |
2584 | * return false if fast path is taken | |
2585 | * sk_lock.slock locked, owned = 0, BH disabled | |
2586 | * return true if slow path is taken | |
2587 | * sk_lock.slock unlocked, owned = 1, BH enabled | |
2588 | */ | |
2589 | bool lock_sock_fast(struct sock *sk) | |
2590 | { | |
2591 | might_sleep(); | |
2592 | spin_lock_bh(&sk->sk_lock.slock); | |
2593 | ||
2594 | if (!sk->sk_lock.owned) | |
2595 | /* | |
2596 | * Note : We must disable BH | |
2597 | */ | |
2598 | return false; | |
2599 | ||
2600 | __lock_sock(sk); | |
2601 | sk->sk_lock.owned = 1; | |
2602 | spin_unlock(&sk->sk_lock.slock); | |
2603 | /* | |
2604 | * The sk_lock has mutex_lock() semantics here: | |
2605 | */ | |
2606 | mutex_acquire(&sk->sk_lock.dep_map, 0, 0, _RET_IP_); | |
2607 | local_bh_enable(); | |
2608 | return true; | |
2609 | } | |
2610 | EXPORT_SYMBOL(lock_sock_fast); | |
2611 | ||
1da177e4 | 2612 | int sock_get_timestamp(struct sock *sk, struct timeval __user *userstamp) |
4ec93edb | 2613 | { |
b7aa0bf7 | 2614 | struct timeval tv; |
1da177e4 | 2615 | if (!sock_flag(sk, SOCK_TIMESTAMP)) |
20d49473 | 2616 | sock_enable_timestamp(sk, SOCK_TIMESTAMP); |
b7aa0bf7 ED |
2617 | tv = ktime_to_timeval(sk->sk_stamp); |
2618 | if (tv.tv_sec == -1) | |
1da177e4 | 2619 | return -ENOENT; |
b7aa0bf7 ED |
2620 | if (tv.tv_sec == 0) { |
2621 | sk->sk_stamp = ktime_get_real(); | |
2622 | tv = ktime_to_timeval(sk->sk_stamp); | |
2623 | } | |
2624 | return copy_to_user(userstamp, &tv, sizeof(tv)) ? -EFAULT : 0; | |
4ec93edb | 2625 | } |
1da177e4 LT |
2626 | EXPORT_SYMBOL(sock_get_timestamp); |
2627 | ||
ae40eb1e ED |
2628 | int sock_get_timestampns(struct sock *sk, struct timespec __user *userstamp) |
2629 | { | |
2630 | struct timespec ts; | |
2631 | if (!sock_flag(sk, SOCK_TIMESTAMP)) | |
20d49473 | 2632 | sock_enable_timestamp(sk, SOCK_TIMESTAMP); |
ae40eb1e ED |
2633 | ts = ktime_to_timespec(sk->sk_stamp); |
2634 | if (ts.tv_sec == -1) | |
2635 | return -ENOENT; | |
2636 | if (ts.tv_sec == 0) { | |
2637 | sk->sk_stamp = ktime_get_real(); | |
2638 | ts = ktime_to_timespec(sk->sk_stamp); | |
2639 | } | |
2640 | return copy_to_user(userstamp, &ts, sizeof(ts)) ? -EFAULT : 0; | |
2641 | } | |
2642 | EXPORT_SYMBOL(sock_get_timestampns); | |
2643 | ||
20d49473 | 2644 | void sock_enable_timestamp(struct sock *sk, int flag) |
4ec93edb | 2645 | { |
20d49473 | 2646 | if (!sock_flag(sk, flag)) { |
08e29af3 ED |
2647 | unsigned long previous_flags = sk->sk_flags; |
2648 | ||
20d49473 PO |
2649 | sock_set_flag(sk, flag); |
2650 | /* | |
2651 | * we just set one of the two flags which require net | |
2652 | * time stamping, but time stamping might have been on | |
2653 | * already because of the other one | |
2654 | */ | |
080a270f HFS |
2655 | if (sock_needs_netstamp(sk) && |
2656 | !(previous_flags & SK_FLAGS_TIMESTAMP)) | |
20d49473 | 2657 | net_enable_timestamp(); |
1da177e4 LT |
2658 | } |
2659 | } | |
1da177e4 | 2660 | |
cb820f8e RC |
2661 | int sock_recv_errqueue(struct sock *sk, struct msghdr *msg, int len, |
2662 | int level, int type) | |
2663 | { | |
2664 | struct sock_exterr_skb *serr; | |
364a9e93 | 2665 | struct sk_buff *skb; |
cb820f8e RC |
2666 | int copied, err; |
2667 | ||
2668 | err = -EAGAIN; | |
364a9e93 | 2669 | skb = sock_dequeue_err_skb(sk); |
cb820f8e RC |
2670 | if (skb == NULL) |
2671 | goto out; | |
2672 | ||
2673 | copied = skb->len; | |
2674 | if (copied > len) { | |
2675 | msg->msg_flags |= MSG_TRUNC; | |
2676 | copied = len; | |
2677 | } | |
51f3d02b | 2678 | err = skb_copy_datagram_msg(skb, 0, msg, copied); |
cb820f8e RC |
2679 | if (err) |
2680 | goto out_free_skb; | |
2681 | ||
2682 | sock_recv_timestamp(msg, sk, skb); | |
2683 | ||
2684 | serr = SKB_EXT_ERR(skb); | |
2685 | put_cmsg(msg, level, type, sizeof(serr->ee), &serr->ee); | |
2686 | ||
2687 | msg->msg_flags |= MSG_ERRQUEUE; | |
2688 | err = copied; | |
2689 | ||
cb820f8e RC |
2690 | out_free_skb: |
2691 | kfree_skb(skb); | |
2692 | out: | |
2693 | return err; | |
2694 | } | |
2695 | EXPORT_SYMBOL(sock_recv_errqueue); | |
2696 | ||
1da177e4 LT |
2697 | /* |
2698 | * Get a socket option on an socket. | |
2699 | * | |
2700 | * FIX: POSIX 1003.1g is very ambiguous here. It states that | |
2701 | * asynchronous errors should be reported by getsockopt. We assume | |
2702 | * this means if you specify SO_ERROR (otherwise whats the point of it). | |
2703 | */ | |
2704 | int sock_common_getsockopt(struct socket *sock, int level, int optname, | |
2705 | char __user *optval, int __user *optlen) | |
2706 | { | |
2707 | struct sock *sk = sock->sk; | |
2708 | ||
2709 | return sk->sk_prot->getsockopt(sk, level, optname, optval, optlen); | |
2710 | } | |
1da177e4 LT |
2711 | EXPORT_SYMBOL(sock_common_getsockopt); |
2712 | ||
3fdadf7d | 2713 | #ifdef CONFIG_COMPAT |
543d9cfe ACM |
2714 | int compat_sock_common_getsockopt(struct socket *sock, int level, int optname, |
2715 | char __user *optval, int __user *optlen) | |
3fdadf7d DM |
2716 | { |
2717 | struct sock *sk = sock->sk; | |
2718 | ||
1e51f951 | 2719 | if (sk->sk_prot->compat_getsockopt != NULL) |
543d9cfe ACM |
2720 | return sk->sk_prot->compat_getsockopt(sk, level, optname, |
2721 | optval, optlen); | |
3fdadf7d DM |
2722 | return sk->sk_prot->getsockopt(sk, level, optname, optval, optlen); |
2723 | } | |
2724 | EXPORT_SYMBOL(compat_sock_common_getsockopt); | |
2725 | #endif | |
2726 | ||
1b784140 YX |
2727 | int sock_common_recvmsg(struct socket *sock, struct msghdr *msg, size_t size, |
2728 | int flags) | |
1da177e4 LT |
2729 | { |
2730 | struct sock *sk = sock->sk; | |
2731 | int addr_len = 0; | |
2732 | int err; | |
2733 | ||
1b784140 | 2734 | err = sk->sk_prot->recvmsg(sk, msg, size, flags & MSG_DONTWAIT, |
1da177e4 LT |
2735 | flags & ~MSG_DONTWAIT, &addr_len); |
2736 | if (err >= 0) | |
2737 | msg->msg_namelen = addr_len; | |
2738 | return err; | |
2739 | } | |
1da177e4 LT |
2740 | EXPORT_SYMBOL(sock_common_recvmsg); |
2741 | ||
2742 | /* | |
2743 | * Set socket options on an inet socket. | |
2744 | */ | |
2745 | int sock_common_setsockopt(struct socket *sock, int level, int optname, | |
b7058842 | 2746 | char __user *optval, unsigned int optlen) |
1da177e4 LT |
2747 | { |
2748 | struct sock *sk = sock->sk; | |
2749 | ||
2750 | return sk->sk_prot->setsockopt(sk, level, optname, optval, optlen); | |
2751 | } | |
1da177e4 LT |
2752 | EXPORT_SYMBOL(sock_common_setsockopt); |
2753 | ||
3fdadf7d | 2754 | #ifdef CONFIG_COMPAT |
543d9cfe | 2755 | int compat_sock_common_setsockopt(struct socket *sock, int level, int optname, |
b7058842 | 2756 | char __user *optval, unsigned int optlen) |
3fdadf7d DM |
2757 | { |
2758 | struct sock *sk = sock->sk; | |
2759 | ||
543d9cfe ACM |
2760 | if (sk->sk_prot->compat_setsockopt != NULL) |
2761 | return sk->sk_prot->compat_setsockopt(sk, level, optname, | |
2762 | optval, optlen); | |
3fdadf7d DM |
2763 | return sk->sk_prot->setsockopt(sk, level, optname, optval, optlen); |
2764 | } | |
2765 | EXPORT_SYMBOL(compat_sock_common_setsockopt); | |
2766 | #endif | |
2767 | ||
1da177e4 LT |
2768 | void sk_common_release(struct sock *sk) |
2769 | { | |
2770 | if (sk->sk_prot->destroy) | |
2771 | sk->sk_prot->destroy(sk); | |
2772 | ||
2773 | /* | |
2774 | * Observation: when sock_common_release is called, processes have | |
2775 | * no access to socket. But net still has. | |
2776 | * Step one, detach it from networking: | |
2777 | * | |
2778 | * A. Remove from hash tables. | |
2779 | */ | |
2780 | ||
2781 | sk->sk_prot->unhash(sk); | |
2782 | ||
2783 | /* | |
2784 | * In this point socket cannot receive new packets, but it is possible | |
2785 | * that some packets are in flight because some CPU runs receiver and | |
2786 | * did hash table lookup before we unhashed socket. They will achieve | |
2787 | * receive queue and will be purged by socket destructor. | |
2788 | * | |
2789 | * Also we still have packets pending on receive queue and probably, | |
2790 | * our own packets waiting in device queues. sock_destroy will drain | |
2791 | * receive queue, but transmitted packets will delay socket destruction | |
2792 | * until the last reference will be released. | |
2793 | */ | |
2794 | ||
2795 | sock_orphan(sk); | |
2796 | ||
2797 | xfrm_sk_free_policy(sk); | |
2798 | ||
e6848976 | 2799 | sk_refcnt_debug_release(sk); |
5640f768 | 2800 | |
1da177e4 LT |
2801 | sock_put(sk); |
2802 | } | |
1da177e4 LT |
2803 | EXPORT_SYMBOL(sk_common_release); |
2804 | ||
13ff3d6f PE |
2805 | #ifdef CONFIG_PROC_FS |
2806 | #define PROTO_INUSE_NR 64 /* should be enough for the first time */ | |
1338d466 PE |
2807 | struct prot_inuse { |
2808 | int val[PROTO_INUSE_NR]; | |
2809 | }; | |
13ff3d6f PE |
2810 | |
2811 | static DECLARE_BITMAP(proto_inuse_idx, PROTO_INUSE_NR); | |
70ee1159 PE |
2812 | |
2813 | #ifdef CONFIG_NET_NS | |
2814 | void sock_prot_inuse_add(struct net *net, struct proto *prot, int val) | |
2815 | { | |
d6d9ca0f | 2816 | __this_cpu_add(net->core.inuse->val[prot->inuse_idx], val); |
70ee1159 PE |
2817 | } |
2818 | EXPORT_SYMBOL_GPL(sock_prot_inuse_add); | |
2819 | ||
2820 | int sock_prot_inuse_get(struct net *net, struct proto *prot) | |
2821 | { | |
2822 | int cpu, idx = prot->inuse_idx; | |
2823 | int res = 0; | |
2824 | ||
2825 | for_each_possible_cpu(cpu) | |
2826 | res += per_cpu_ptr(net->core.inuse, cpu)->val[idx]; | |
2827 | ||
2828 | return res >= 0 ? res : 0; | |
2829 | } | |
2830 | EXPORT_SYMBOL_GPL(sock_prot_inuse_get); | |
2831 | ||
2c8c1e72 | 2832 | static int __net_init sock_inuse_init_net(struct net *net) |
70ee1159 PE |
2833 | { |
2834 | net->core.inuse = alloc_percpu(struct prot_inuse); | |
2835 | return net->core.inuse ? 0 : -ENOMEM; | |
2836 | } | |
2837 | ||
2c8c1e72 | 2838 | static void __net_exit sock_inuse_exit_net(struct net *net) |
70ee1159 PE |
2839 | { |
2840 | free_percpu(net->core.inuse); | |
2841 | } | |
2842 | ||
2843 | static struct pernet_operations net_inuse_ops = { | |
2844 | .init = sock_inuse_init_net, | |
2845 | .exit = sock_inuse_exit_net, | |
2846 | }; | |
2847 | ||
2848 | static __init int net_inuse_init(void) | |
2849 | { | |
2850 | if (register_pernet_subsys(&net_inuse_ops)) | |
2851 | panic("Cannot initialize net inuse counters"); | |
2852 | ||
2853 | return 0; | |
2854 | } | |
2855 | ||
2856 | core_initcall(net_inuse_init); | |
2857 | #else | |
1338d466 PE |
2858 | static DEFINE_PER_CPU(struct prot_inuse, prot_inuse); |
2859 | ||
c29a0bc4 | 2860 | void sock_prot_inuse_add(struct net *net, struct proto *prot, int val) |
1338d466 | 2861 | { |
d6d9ca0f | 2862 | __this_cpu_add(prot_inuse.val[prot->inuse_idx], val); |
1338d466 PE |
2863 | } |
2864 | EXPORT_SYMBOL_GPL(sock_prot_inuse_add); | |
2865 | ||
c29a0bc4 | 2866 | int sock_prot_inuse_get(struct net *net, struct proto *prot) |
1338d466 PE |
2867 | { |
2868 | int cpu, idx = prot->inuse_idx; | |
2869 | int res = 0; | |
2870 | ||
2871 | for_each_possible_cpu(cpu) | |
2872 | res += per_cpu(prot_inuse, cpu).val[idx]; | |
2873 | ||
2874 | return res >= 0 ? res : 0; | |
2875 | } | |
2876 | EXPORT_SYMBOL_GPL(sock_prot_inuse_get); | |
70ee1159 | 2877 | #endif |
13ff3d6f PE |
2878 | |
2879 | static void assign_proto_idx(struct proto *prot) | |
2880 | { | |
2881 | prot->inuse_idx = find_first_zero_bit(proto_inuse_idx, PROTO_INUSE_NR); | |
2882 | ||
2883 | if (unlikely(prot->inuse_idx == PROTO_INUSE_NR - 1)) { | |
e005d193 | 2884 | pr_err("PROTO_INUSE_NR exhausted\n"); |
13ff3d6f PE |
2885 | return; |
2886 | } | |
2887 | ||
2888 | set_bit(prot->inuse_idx, proto_inuse_idx); | |
2889 | } | |
2890 | ||
2891 | static void release_proto_idx(struct proto *prot) | |
2892 | { | |
2893 | if (prot->inuse_idx != PROTO_INUSE_NR - 1) | |
2894 | clear_bit(prot->inuse_idx, proto_inuse_idx); | |
2895 | } | |
2896 | #else | |
2897 | static inline void assign_proto_idx(struct proto *prot) | |
2898 | { | |
2899 | } | |
2900 | ||
2901 | static inline void release_proto_idx(struct proto *prot) | |
2902 | { | |
2903 | } | |
2904 | #endif | |
2905 | ||
0159dfd3 ED |
2906 | static void req_prot_cleanup(struct request_sock_ops *rsk_prot) |
2907 | { | |
2908 | if (!rsk_prot) | |
2909 | return; | |
2910 | kfree(rsk_prot->slab_name); | |
2911 | rsk_prot->slab_name = NULL; | |
adf78eda JL |
2912 | kmem_cache_destroy(rsk_prot->slab); |
2913 | rsk_prot->slab = NULL; | |
0159dfd3 ED |
2914 | } |
2915 | ||
2916 | static int req_prot_init(const struct proto *prot) | |
2917 | { | |
2918 | struct request_sock_ops *rsk_prot = prot->rsk_prot; | |
2919 | ||
2920 | if (!rsk_prot) | |
2921 | return 0; | |
2922 | ||
2923 | rsk_prot->slab_name = kasprintf(GFP_KERNEL, "request_sock_%s", | |
2924 | prot->name); | |
2925 | if (!rsk_prot->slab_name) | |
2926 | return -ENOMEM; | |
2927 | ||
2928 | rsk_prot->slab = kmem_cache_create(rsk_prot->slab_name, | |
2929 | rsk_prot->obj_size, 0, | |
e96f78ab | 2930 | prot->slab_flags, NULL); |
0159dfd3 ED |
2931 | |
2932 | if (!rsk_prot->slab) { | |
2933 | pr_crit("%s: Can't create request sock SLAB cache!\n", | |
2934 | prot->name); | |
2935 | return -ENOMEM; | |
2936 | } | |
2937 | return 0; | |
2938 | } | |
2939 | ||
b733c007 PE |
2940 | int proto_register(struct proto *prot, int alloc_slab) |
2941 | { | |
1da177e4 LT |
2942 | if (alloc_slab) { |
2943 | prot->slab = kmem_cache_create(prot->name, prot->obj_size, 0, | |
271b72c7 ED |
2944 | SLAB_HWCACHE_ALIGN | prot->slab_flags, |
2945 | NULL); | |
1da177e4 LT |
2946 | |
2947 | if (prot->slab == NULL) { | |
e005d193 JP |
2948 | pr_crit("%s: Can't create sock SLAB cache!\n", |
2949 | prot->name); | |
60e7663d | 2950 | goto out; |
1da177e4 | 2951 | } |
2e6599cb | 2952 | |
0159dfd3 ED |
2953 | if (req_prot_init(prot)) |
2954 | goto out_free_request_sock_slab; | |
8feaf0c0 | 2955 | |
6d6ee43e | 2956 | if (prot->twsk_prot != NULL) { |
faf23422 | 2957 | prot->twsk_prot->twsk_slab_name = kasprintf(GFP_KERNEL, "tw_sock_%s", prot->name); |
8feaf0c0 | 2958 | |
7e56b5d6 | 2959 | if (prot->twsk_prot->twsk_slab_name == NULL) |
8feaf0c0 ACM |
2960 | goto out_free_request_sock_slab; |
2961 | ||
6d6ee43e | 2962 | prot->twsk_prot->twsk_slab = |
7e56b5d6 | 2963 | kmem_cache_create(prot->twsk_prot->twsk_slab_name, |
6d6ee43e | 2964 | prot->twsk_prot->twsk_obj_size, |
3ab5aee7 | 2965 | 0, |
52db70dc | 2966 | prot->slab_flags, |
20c2df83 | 2967 | NULL); |
6d6ee43e | 2968 | if (prot->twsk_prot->twsk_slab == NULL) |
8feaf0c0 ACM |
2969 | goto out_free_timewait_sock_slab_name; |
2970 | } | |
1da177e4 LT |
2971 | } |
2972 | ||
36b77a52 | 2973 | mutex_lock(&proto_list_mutex); |
1da177e4 | 2974 | list_add(&prot->node, &proto_list); |
13ff3d6f | 2975 | assign_proto_idx(prot); |
36b77a52 | 2976 | mutex_unlock(&proto_list_mutex); |
b733c007 PE |
2977 | return 0; |
2978 | ||
8feaf0c0 | 2979 | out_free_timewait_sock_slab_name: |
7e56b5d6 | 2980 | kfree(prot->twsk_prot->twsk_slab_name); |
8feaf0c0 | 2981 | out_free_request_sock_slab: |
0159dfd3 ED |
2982 | req_prot_cleanup(prot->rsk_prot); |
2983 | ||
2e6599cb ACM |
2984 | kmem_cache_destroy(prot->slab); |
2985 | prot->slab = NULL; | |
b733c007 PE |
2986 | out: |
2987 | return -ENOBUFS; | |
1da177e4 | 2988 | } |
1da177e4 LT |
2989 | EXPORT_SYMBOL(proto_register); |
2990 | ||
2991 | void proto_unregister(struct proto *prot) | |
2992 | { | |
36b77a52 | 2993 | mutex_lock(&proto_list_mutex); |
13ff3d6f | 2994 | release_proto_idx(prot); |
0a3f4358 | 2995 | list_del(&prot->node); |
36b77a52 | 2996 | mutex_unlock(&proto_list_mutex); |
1da177e4 | 2997 | |
adf78eda JL |
2998 | kmem_cache_destroy(prot->slab); |
2999 | prot->slab = NULL; | |
1da177e4 | 3000 | |
0159dfd3 | 3001 | req_prot_cleanup(prot->rsk_prot); |
2e6599cb | 3002 | |
6d6ee43e | 3003 | if (prot->twsk_prot != NULL && prot->twsk_prot->twsk_slab != NULL) { |
6d6ee43e | 3004 | kmem_cache_destroy(prot->twsk_prot->twsk_slab); |
7e56b5d6 | 3005 | kfree(prot->twsk_prot->twsk_slab_name); |
6d6ee43e | 3006 | prot->twsk_prot->twsk_slab = NULL; |
8feaf0c0 | 3007 | } |
1da177e4 | 3008 | } |
1da177e4 LT |
3009 | EXPORT_SYMBOL(proto_unregister); |
3010 | ||
3011 | #ifdef CONFIG_PROC_FS | |
1da177e4 | 3012 | static void *proto_seq_start(struct seq_file *seq, loff_t *pos) |
36b77a52 | 3013 | __acquires(proto_list_mutex) |
1da177e4 | 3014 | { |
36b77a52 | 3015 | mutex_lock(&proto_list_mutex); |
60f0438a | 3016 | return seq_list_start_head(&proto_list, *pos); |
1da177e4 LT |
3017 | } |
3018 | ||
3019 | static void *proto_seq_next(struct seq_file *seq, void *v, loff_t *pos) | |
3020 | { | |
60f0438a | 3021 | return seq_list_next(v, &proto_list, pos); |
1da177e4 LT |
3022 | } |
3023 | ||
3024 | static void proto_seq_stop(struct seq_file *seq, void *v) | |
36b77a52 | 3025 | __releases(proto_list_mutex) |
1da177e4 | 3026 | { |
36b77a52 | 3027 | mutex_unlock(&proto_list_mutex); |
1da177e4 LT |
3028 | } |
3029 | ||
3030 | static char proto_method_implemented(const void *method) | |
3031 | { | |
3032 | return method == NULL ? 'n' : 'y'; | |
3033 | } | |
180d8cd9 GC |
3034 | static long sock_prot_memory_allocated(struct proto *proto) |
3035 | { | |
cb75a36c | 3036 | return proto->memory_allocated != NULL ? proto_memory_allocated(proto) : -1L; |
180d8cd9 GC |
3037 | } |
3038 | ||
3039 | static char *sock_prot_memory_pressure(struct proto *proto) | |
3040 | { | |
3041 | return proto->memory_pressure != NULL ? | |
3042 | proto_memory_pressure(proto) ? "yes" : "no" : "NI"; | |
3043 | } | |
1da177e4 LT |
3044 | |
3045 | static void proto_seq_printf(struct seq_file *seq, struct proto *proto) | |
3046 | { | |
180d8cd9 | 3047 | |
8d987e5c | 3048 | seq_printf(seq, "%-9s %4u %6d %6ld %-3s %6u %-3s %-10s " |
1da177e4 LT |
3049 | "%2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c\n", |
3050 | proto->name, | |
3051 | proto->obj_size, | |
14e943db | 3052 | sock_prot_inuse_get(seq_file_net(seq), proto), |
180d8cd9 GC |
3053 | sock_prot_memory_allocated(proto), |
3054 | sock_prot_memory_pressure(proto), | |
1da177e4 LT |
3055 | proto->max_header, |
3056 | proto->slab == NULL ? "no" : "yes", | |
3057 | module_name(proto->owner), | |
3058 | proto_method_implemented(proto->close), | |
3059 | proto_method_implemented(proto->connect), | |
3060 | proto_method_implemented(proto->disconnect), | |
3061 | proto_method_implemented(proto->accept), | |
3062 | proto_method_implemented(proto->ioctl), | |
3063 | proto_method_implemented(proto->init), | |
3064 | proto_method_implemented(proto->destroy), | |
3065 | proto_method_implemented(proto->shutdown), | |
3066 | proto_method_implemented(proto->setsockopt), | |
3067 | proto_method_implemented(proto->getsockopt), | |
3068 | proto_method_implemented(proto->sendmsg), | |
3069 | proto_method_implemented(proto->recvmsg), | |
3070 | proto_method_implemented(proto->sendpage), | |
3071 | proto_method_implemented(proto->bind), | |
3072 | proto_method_implemented(proto->backlog_rcv), | |
3073 | proto_method_implemented(proto->hash), | |
3074 | proto_method_implemented(proto->unhash), | |
3075 | proto_method_implemented(proto->get_port), | |
3076 | proto_method_implemented(proto->enter_memory_pressure)); | |
3077 | } | |
3078 | ||
3079 | static int proto_seq_show(struct seq_file *seq, void *v) | |
3080 | { | |
60f0438a | 3081 | if (v == &proto_list) |
1da177e4 LT |
3082 | seq_printf(seq, "%-9s %-4s %-8s %-6s %-5s %-7s %-4s %-10s %s", |
3083 | "protocol", | |
3084 | "size", | |
3085 | "sockets", | |
3086 | "memory", | |
3087 | "press", | |
3088 | "maxhdr", | |
3089 | "slab", | |
3090 | "module", | |
3091 | "cl co di ac io in de sh ss gs se re sp bi br ha uh gp em\n"); | |
3092 | else | |
60f0438a | 3093 | proto_seq_printf(seq, list_entry(v, struct proto, node)); |
1da177e4 LT |
3094 | return 0; |
3095 | } | |
3096 | ||
f690808e | 3097 | static const struct seq_operations proto_seq_ops = { |
1da177e4 LT |
3098 | .start = proto_seq_start, |
3099 | .next = proto_seq_next, | |
3100 | .stop = proto_seq_stop, | |
3101 | .show = proto_seq_show, | |
3102 | }; | |
3103 | ||
3104 | static int proto_seq_open(struct inode *inode, struct file *file) | |
3105 | { | |
14e943db ED |
3106 | return seq_open_net(inode, file, &proto_seq_ops, |
3107 | sizeof(struct seq_net_private)); | |
1da177e4 LT |
3108 | } |
3109 | ||
9a32144e | 3110 | static const struct file_operations proto_seq_fops = { |
1da177e4 LT |
3111 | .owner = THIS_MODULE, |
3112 | .open = proto_seq_open, | |
3113 | .read = seq_read, | |
3114 | .llseek = seq_lseek, | |
14e943db ED |
3115 | .release = seq_release_net, |
3116 | }; | |
3117 | ||
3118 | static __net_init int proto_init_net(struct net *net) | |
3119 | { | |
d4beaa66 | 3120 | if (!proc_create("protocols", S_IRUGO, net->proc_net, &proto_seq_fops)) |
14e943db ED |
3121 | return -ENOMEM; |
3122 | ||
3123 | return 0; | |
3124 | } | |
3125 | ||
3126 | static __net_exit void proto_exit_net(struct net *net) | |
3127 | { | |
ece31ffd | 3128 | remove_proc_entry("protocols", net->proc_net); |
14e943db ED |
3129 | } |
3130 | ||
3131 | ||
3132 | static __net_initdata struct pernet_operations proto_net_ops = { | |
3133 | .init = proto_init_net, | |
3134 | .exit = proto_exit_net, | |
1da177e4 LT |
3135 | }; |
3136 | ||
3137 | static int __init proto_init(void) | |
3138 | { | |
14e943db | 3139 | return register_pernet_subsys(&proto_net_ops); |
1da177e4 LT |
3140 | } |
3141 | ||
3142 | subsys_initcall(proto_init); | |
3143 | ||
3144 | #endif /* PROC_FS */ |