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 LT |
95 | #include <linux/errno.h> |
96 | #include <linux/types.h> | |
97 | #include <linux/socket.h> | |
98 | #include <linux/in.h> | |
99 | #include <linux/kernel.h> | |
1da177e4 LT |
100 | #include <linux/module.h> |
101 | #include <linux/proc_fs.h> | |
102 | #include <linux/seq_file.h> | |
103 | #include <linux/sched.h> | |
104 | #include <linux/timer.h> | |
105 | #include <linux/string.h> | |
106 | #include <linux/sockios.h> | |
107 | #include <linux/net.h> | |
108 | #include <linux/mm.h> | |
109 | #include <linux/slab.h> | |
110 | #include <linux/interrupt.h> | |
111 | #include <linux/poll.h> | |
112 | #include <linux/tcp.h> | |
113 | #include <linux/init.h> | |
a1f8e7f7 | 114 | #include <linux/highmem.h> |
3f551f94 | 115 | #include <linux/user_namespace.h> |
c5905afb | 116 | #include <linux/static_key.h> |
3969eb38 | 117 | #include <linux/memcontrol.h> |
8c1ae10d | 118 | #include <linux/prefetch.h> |
1da177e4 LT |
119 | |
120 | #include <asm/uaccess.h> | |
1da177e4 LT |
121 | |
122 | #include <linux/netdevice.h> | |
123 | #include <net/protocol.h> | |
124 | #include <linux/skbuff.h> | |
457c4cbc | 125 | #include <net/net_namespace.h> |
2e6599cb | 126 | #include <net/request_sock.h> |
1da177e4 | 127 | #include <net/sock.h> |
20d49473 | 128 | #include <linux/net_tstamp.h> |
1da177e4 LT |
129 | #include <net/xfrm.h> |
130 | #include <linux/ipsec.h> | |
f8451725 | 131 | #include <net/cls_cgroup.h> |
5bc1421e | 132 | #include <net/netprio_cgroup.h> |
1da177e4 LT |
133 | |
134 | #include <linux/filter.h> | |
135 | ||
3847ce32 SM |
136 | #include <trace/events/sock.h> |
137 | ||
1da177e4 LT |
138 | #ifdef CONFIG_INET |
139 | #include <net/tcp.h> | |
140 | #endif | |
141 | ||
36b77a52 | 142 | static DEFINE_MUTEX(proto_list_mutex); |
d1a4c0b3 GC |
143 | static LIST_HEAD(proto_list); |
144 | ||
c255a458 | 145 | #ifdef CONFIG_MEMCG_KMEM |
1d62e436 | 146 | int mem_cgroup_sockets_init(struct mem_cgroup *memcg, struct cgroup_subsys *ss) |
d1a4c0b3 GC |
147 | { |
148 | struct proto *proto; | |
149 | int ret = 0; | |
150 | ||
36b77a52 | 151 | mutex_lock(&proto_list_mutex); |
d1a4c0b3 GC |
152 | list_for_each_entry(proto, &proto_list, node) { |
153 | if (proto->init_cgroup) { | |
1d62e436 | 154 | ret = proto->init_cgroup(memcg, ss); |
d1a4c0b3 GC |
155 | if (ret) |
156 | goto out; | |
157 | } | |
158 | } | |
159 | ||
36b77a52 | 160 | mutex_unlock(&proto_list_mutex); |
d1a4c0b3 GC |
161 | return ret; |
162 | out: | |
163 | list_for_each_entry_continue_reverse(proto, &proto_list, node) | |
164 | if (proto->destroy_cgroup) | |
1d62e436 | 165 | proto->destroy_cgroup(memcg); |
36b77a52 | 166 | mutex_unlock(&proto_list_mutex); |
d1a4c0b3 GC |
167 | return ret; |
168 | } | |
169 | ||
1d62e436 | 170 | void mem_cgroup_sockets_destroy(struct mem_cgroup *memcg) |
d1a4c0b3 GC |
171 | { |
172 | struct proto *proto; | |
173 | ||
36b77a52 | 174 | mutex_lock(&proto_list_mutex); |
d1a4c0b3 GC |
175 | list_for_each_entry_reverse(proto, &proto_list, node) |
176 | if (proto->destroy_cgroup) | |
1d62e436 | 177 | proto->destroy_cgroup(memcg); |
36b77a52 | 178 | mutex_unlock(&proto_list_mutex); |
d1a4c0b3 GC |
179 | } |
180 | #endif | |
181 | ||
da21f24d IM |
182 | /* |
183 | * Each address family might have different locking rules, so we have | |
184 | * one slock key per address family: | |
185 | */ | |
a5b5bb9a IM |
186 | static struct lock_class_key af_family_keys[AF_MAX]; |
187 | static struct lock_class_key af_family_slock_keys[AF_MAX]; | |
188 | ||
c5905afb | 189 | struct static_key memcg_socket_limit_enabled; |
e1aab161 GC |
190 | EXPORT_SYMBOL(memcg_socket_limit_enabled); |
191 | ||
a5b5bb9a IM |
192 | /* |
193 | * Make lock validator output more readable. (we pre-construct these | |
194 | * strings build-time, so that runtime initialization of socket | |
195 | * locks is fast): | |
196 | */ | |
36cbd3dc | 197 | static const char *const af_family_key_strings[AF_MAX+1] = { |
a5b5bb9a IM |
198 | "sk_lock-AF_UNSPEC", "sk_lock-AF_UNIX" , "sk_lock-AF_INET" , |
199 | "sk_lock-AF_AX25" , "sk_lock-AF_IPX" , "sk_lock-AF_APPLETALK", | |
200 | "sk_lock-AF_NETROM", "sk_lock-AF_BRIDGE" , "sk_lock-AF_ATMPVC" , | |
201 | "sk_lock-AF_X25" , "sk_lock-AF_INET6" , "sk_lock-AF_ROSE" , | |
202 | "sk_lock-AF_DECnet", "sk_lock-AF_NETBEUI" , "sk_lock-AF_SECURITY" , | |
203 | "sk_lock-AF_KEY" , "sk_lock-AF_NETLINK" , "sk_lock-AF_PACKET" , | |
204 | "sk_lock-AF_ASH" , "sk_lock-AF_ECONET" , "sk_lock-AF_ATMSVC" , | |
cbd151bf | 205 | "sk_lock-AF_RDS" , "sk_lock-AF_SNA" , "sk_lock-AF_IRDA" , |
a5b5bb9a | 206 | "sk_lock-AF_PPPOX" , "sk_lock-AF_WANPIPE" , "sk_lock-AF_LLC" , |
cd05acfe | 207 | "sk_lock-27" , "sk_lock-28" , "sk_lock-AF_CAN" , |
17926a79 | 208 | "sk_lock-AF_TIPC" , "sk_lock-AF_BLUETOOTH", "sk_lock-IUCV" , |
bce7b154 | 209 | "sk_lock-AF_RXRPC" , "sk_lock-AF_ISDN" , "sk_lock-AF_PHONET" , |
6f107b58 | 210 | "sk_lock-AF_IEEE802154", "sk_lock-AF_CAIF" , "sk_lock-AF_ALG" , |
c7fe3b52 | 211 | "sk_lock-AF_NFC" , "sk_lock-AF_MAX" |
a5b5bb9a | 212 | }; |
36cbd3dc | 213 | static const char *const af_family_slock_key_strings[AF_MAX+1] = { |
a5b5bb9a IM |
214 | "slock-AF_UNSPEC", "slock-AF_UNIX" , "slock-AF_INET" , |
215 | "slock-AF_AX25" , "slock-AF_IPX" , "slock-AF_APPLETALK", | |
216 | "slock-AF_NETROM", "slock-AF_BRIDGE" , "slock-AF_ATMPVC" , | |
217 | "slock-AF_X25" , "slock-AF_INET6" , "slock-AF_ROSE" , | |
218 | "slock-AF_DECnet", "slock-AF_NETBEUI" , "slock-AF_SECURITY" , | |
219 | "slock-AF_KEY" , "slock-AF_NETLINK" , "slock-AF_PACKET" , | |
220 | "slock-AF_ASH" , "slock-AF_ECONET" , "slock-AF_ATMSVC" , | |
cbd151bf | 221 | "slock-AF_RDS" , "slock-AF_SNA" , "slock-AF_IRDA" , |
a5b5bb9a | 222 | "slock-AF_PPPOX" , "slock-AF_WANPIPE" , "slock-AF_LLC" , |
cd05acfe | 223 | "slock-27" , "slock-28" , "slock-AF_CAN" , |
17926a79 | 224 | "slock-AF_TIPC" , "slock-AF_BLUETOOTH", "slock-AF_IUCV" , |
bce7b154 | 225 | "slock-AF_RXRPC" , "slock-AF_ISDN" , "slock-AF_PHONET" , |
6f107b58 | 226 | "slock-AF_IEEE802154", "slock-AF_CAIF" , "slock-AF_ALG" , |
c7fe3b52 | 227 | "slock-AF_NFC" , "slock-AF_MAX" |
a5b5bb9a | 228 | }; |
36cbd3dc | 229 | static const char *const af_family_clock_key_strings[AF_MAX+1] = { |
443aef0e PZ |
230 | "clock-AF_UNSPEC", "clock-AF_UNIX" , "clock-AF_INET" , |
231 | "clock-AF_AX25" , "clock-AF_IPX" , "clock-AF_APPLETALK", | |
232 | "clock-AF_NETROM", "clock-AF_BRIDGE" , "clock-AF_ATMPVC" , | |
233 | "clock-AF_X25" , "clock-AF_INET6" , "clock-AF_ROSE" , | |
234 | "clock-AF_DECnet", "clock-AF_NETBEUI" , "clock-AF_SECURITY" , | |
235 | "clock-AF_KEY" , "clock-AF_NETLINK" , "clock-AF_PACKET" , | |
236 | "clock-AF_ASH" , "clock-AF_ECONET" , "clock-AF_ATMSVC" , | |
cbd151bf | 237 | "clock-AF_RDS" , "clock-AF_SNA" , "clock-AF_IRDA" , |
443aef0e | 238 | "clock-AF_PPPOX" , "clock-AF_WANPIPE" , "clock-AF_LLC" , |
b4942af6 | 239 | "clock-27" , "clock-28" , "clock-AF_CAN" , |
e51f802b | 240 | "clock-AF_TIPC" , "clock-AF_BLUETOOTH", "clock-AF_IUCV" , |
bce7b154 | 241 | "clock-AF_RXRPC" , "clock-AF_ISDN" , "clock-AF_PHONET" , |
6f107b58 | 242 | "clock-AF_IEEE802154", "clock-AF_CAIF" , "clock-AF_ALG" , |
c7fe3b52 | 243 | "clock-AF_NFC" , "clock-AF_MAX" |
443aef0e | 244 | }; |
da21f24d IM |
245 | |
246 | /* | |
247 | * sk_callback_lock locking rules are per-address-family, | |
248 | * so split the lock classes by using a per-AF key: | |
249 | */ | |
250 | static struct lock_class_key af_callback_keys[AF_MAX]; | |
251 | ||
1da177e4 LT |
252 | /* Take into consideration the size of the struct sk_buff overhead in the |
253 | * determination of these values, since that is non-constant across | |
254 | * platforms. This makes socket queueing behavior and performance | |
255 | * not depend upon such differences. | |
256 | */ | |
257 | #define _SK_MEM_PACKETS 256 | |
87fb4b7b | 258 | #define _SK_MEM_OVERHEAD SKB_TRUESIZE(256) |
1da177e4 LT |
259 | #define SK_WMEM_MAX (_SK_MEM_OVERHEAD * _SK_MEM_PACKETS) |
260 | #define SK_RMEM_MAX (_SK_MEM_OVERHEAD * _SK_MEM_PACKETS) | |
261 | ||
262 | /* Run time adjustable parameters. */ | |
ab32ea5d | 263 | __u32 sysctl_wmem_max __read_mostly = SK_WMEM_MAX; |
6d8ebc8a | 264 | EXPORT_SYMBOL(sysctl_wmem_max); |
ab32ea5d | 265 | __u32 sysctl_rmem_max __read_mostly = SK_RMEM_MAX; |
6d8ebc8a | 266 | EXPORT_SYMBOL(sysctl_rmem_max); |
ab32ea5d BH |
267 | __u32 sysctl_wmem_default __read_mostly = SK_WMEM_MAX; |
268 | __u32 sysctl_rmem_default __read_mostly = SK_RMEM_MAX; | |
1da177e4 | 269 | |
25985edc | 270 | /* Maximal space eaten by iovec or ancillary data plus some space */ |
ab32ea5d | 271 | int sysctl_optmem_max __read_mostly = sizeof(unsigned long)*(2*UIO_MAXIOV+512); |
2a91525c | 272 | EXPORT_SYMBOL(sysctl_optmem_max); |
1da177e4 | 273 | |
c93bdd0e MG |
274 | struct static_key memalloc_socks = STATIC_KEY_INIT_FALSE; |
275 | EXPORT_SYMBOL_GPL(memalloc_socks); | |
276 | ||
7cb02404 MG |
277 | /** |
278 | * sk_set_memalloc - sets %SOCK_MEMALLOC | |
279 | * @sk: socket to set it on | |
280 | * | |
281 | * Set %SOCK_MEMALLOC on a socket for access to emergency reserves. | |
282 | * It's the responsibility of the admin to adjust min_free_kbytes | |
283 | * to meet the requirements | |
284 | */ | |
285 | void sk_set_memalloc(struct sock *sk) | |
286 | { | |
287 | sock_set_flag(sk, SOCK_MEMALLOC); | |
288 | sk->sk_allocation |= __GFP_MEMALLOC; | |
c93bdd0e | 289 | static_key_slow_inc(&memalloc_socks); |
7cb02404 MG |
290 | } |
291 | EXPORT_SYMBOL_GPL(sk_set_memalloc); | |
292 | ||
293 | void sk_clear_memalloc(struct sock *sk) | |
294 | { | |
295 | sock_reset_flag(sk, SOCK_MEMALLOC); | |
296 | sk->sk_allocation &= ~__GFP_MEMALLOC; | |
c93bdd0e | 297 | static_key_slow_dec(&memalloc_socks); |
c76562b6 MG |
298 | |
299 | /* | |
300 | * SOCK_MEMALLOC is allowed to ignore rmem limits to ensure forward | |
301 | * progress of swapping. However, if SOCK_MEMALLOC is cleared while | |
302 | * it has rmem allocations there is a risk that the user of the | |
303 | * socket cannot make forward progress due to exceeding the rmem | |
304 | * limits. By rights, sk_clear_memalloc() should only be called | |
305 | * on sockets being torn down but warn and reset the accounting if | |
306 | * that assumption breaks. | |
307 | */ | |
308 | if (WARN_ON(sk->sk_forward_alloc)) | |
309 | sk_mem_reclaim(sk); | |
7cb02404 MG |
310 | } |
311 | EXPORT_SYMBOL_GPL(sk_clear_memalloc); | |
312 | ||
b4b9e355 MG |
313 | int __sk_backlog_rcv(struct sock *sk, struct sk_buff *skb) |
314 | { | |
315 | int ret; | |
316 | unsigned long pflags = current->flags; | |
317 | ||
318 | /* these should have been dropped before queueing */ | |
319 | BUG_ON(!sock_flag(sk, SOCK_MEMALLOC)); | |
320 | ||
321 | current->flags |= PF_MEMALLOC; | |
322 | ret = sk->sk_backlog_rcv(sk, skb); | |
323 | tsk_restore_flags(current, pflags, PF_MEMALLOC); | |
324 | ||
325 | return ret; | |
326 | } | |
327 | EXPORT_SYMBOL(__sk_backlog_rcv); | |
328 | ||
1da177e4 LT |
329 | static int sock_set_timeout(long *timeo_p, char __user *optval, int optlen) |
330 | { | |
331 | struct timeval tv; | |
332 | ||
333 | if (optlen < sizeof(tv)) | |
334 | return -EINVAL; | |
335 | if (copy_from_user(&tv, optval, sizeof(tv))) | |
336 | return -EFAULT; | |
ba78073e VA |
337 | if (tv.tv_usec < 0 || tv.tv_usec >= USEC_PER_SEC) |
338 | return -EDOM; | |
1da177e4 | 339 | |
ba78073e | 340 | if (tv.tv_sec < 0) { |
6f11df83 AM |
341 | static int warned __read_mostly; |
342 | ||
ba78073e | 343 | *timeo_p = 0; |
50aab54f | 344 | if (warned < 10 && net_ratelimit()) { |
ba78073e | 345 | warned++; |
e005d193 JP |
346 | pr_info("%s: `%s' (pid %d) tries to set negative timeout\n", |
347 | __func__, current->comm, task_pid_nr(current)); | |
50aab54f | 348 | } |
ba78073e VA |
349 | return 0; |
350 | } | |
1da177e4 LT |
351 | *timeo_p = MAX_SCHEDULE_TIMEOUT; |
352 | if (tv.tv_sec == 0 && tv.tv_usec == 0) | |
353 | return 0; | |
354 | if (tv.tv_sec < (MAX_SCHEDULE_TIMEOUT/HZ - 1)) | |
355 | *timeo_p = tv.tv_sec*HZ + (tv.tv_usec+(1000000/HZ-1))/(1000000/HZ); | |
356 | return 0; | |
357 | } | |
358 | ||
359 | static void sock_warn_obsolete_bsdism(const char *name) | |
360 | { | |
361 | static int warned; | |
362 | static char warncomm[TASK_COMM_LEN]; | |
4ec93edb YH |
363 | if (strcmp(warncomm, current->comm) && warned < 5) { |
364 | strcpy(warncomm, current->comm); | |
e005d193 JP |
365 | pr_warn("process `%s' is using obsolete %s SO_BSDCOMPAT\n", |
366 | warncomm, name); | |
1da177e4 LT |
367 | warned++; |
368 | } | |
369 | } | |
370 | ||
08e29af3 ED |
371 | #define SK_FLAGS_TIMESTAMP ((1UL << SOCK_TIMESTAMP) | (1UL << SOCK_TIMESTAMPING_RX_SOFTWARE)) |
372 | ||
373 | static void sock_disable_timestamp(struct sock *sk, unsigned long flags) | |
4ec93edb | 374 | { |
08e29af3 ED |
375 | if (sk->sk_flags & flags) { |
376 | sk->sk_flags &= ~flags; | |
377 | if (!(sk->sk_flags & SK_FLAGS_TIMESTAMP)) | |
20d49473 | 378 | net_disable_timestamp(); |
1da177e4 LT |
379 | } |
380 | } | |
381 | ||
382 | ||
f0088a50 DV |
383 | int sock_queue_rcv_skb(struct sock *sk, struct sk_buff *skb) |
384 | { | |
766e9037 | 385 | int err; |
f0088a50 | 386 | int skb_len; |
3b885787 NH |
387 | unsigned long flags; |
388 | struct sk_buff_head *list = &sk->sk_receive_queue; | |
f0088a50 | 389 | |
0fd7bac6 | 390 | if (atomic_read(&sk->sk_rmem_alloc) >= sk->sk_rcvbuf) { |
766e9037 | 391 | atomic_inc(&sk->sk_drops); |
3847ce32 | 392 | trace_sock_rcvqueue_full(sk, skb); |
766e9037 | 393 | return -ENOMEM; |
f0088a50 DV |
394 | } |
395 | ||
fda9ef5d | 396 | err = sk_filter(sk, skb); |
f0088a50 | 397 | if (err) |
766e9037 | 398 | return err; |
f0088a50 | 399 | |
c76562b6 | 400 | if (!sk_rmem_schedule(sk, skb, skb->truesize)) { |
766e9037 ED |
401 | atomic_inc(&sk->sk_drops); |
402 | return -ENOBUFS; | |
3ab224be HA |
403 | } |
404 | ||
f0088a50 DV |
405 | skb->dev = NULL; |
406 | skb_set_owner_r(skb, sk); | |
49ad9599 | 407 | |
f0088a50 DV |
408 | /* Cache the SKB length before we tack it onto the receive |
409 | * queue. Once it is added it no longer belongs to us and | |
410 | * may be freed by other threads of control pulling packets | |
411 | * from the queue. | |
412 | */ | |
413 | skb_len = skb->len; | |
414 | ||
7fee226a ED |
415 | /* we escape from rcu protected region, make sure we dont leak |
416 | * a norefcounted dst | |
417 | */ | |
418 | skb_dst_force(skb); | |
419 | ||
3b885787 NH |
420 | spin_lock_irqsave(&list->lock, flags); |
421 | skb->dropcount = atomic_read(&sk->sk_drops); | |
422 | __skb_queue_tail(list, skb); | |
423 | spin_unlock_irqrestore(&list->lock, flags); | |
f0088a50 DV |
424 | |
425 | if (!sock_flag(sk, SOCK_DEAD)) | |
426 | sk->sk_data_ready(sk, skb_len); | |
766e9037 | 427 | return 0; |
f0088a50 DV |
428 | } |
429 | EXPORT_SYMBOL(sock_queue_rcv_skb); | |
430 | ||
58a5a7b9 | 431 | int sk_receive_skb(struct sock *sk, struct sk_buff *skb, const int nested) |
f0088a50 DV |
432 | { |
433 | int rc = NET_RX_SUCCESS; | |
434 | ||
fda9ef5d | 435 | if (sk_filter(sk, skb)) |
f0088a50 DV |
436 | goto discard_and_relse; |
437 | ||
438 | skb->dev = NULL; | |
439 | ||
f545a38f | 440 | if (sk_rcvqueues_full(sk, skb, sk->sk_rcvbuf)) { |
c377411f ED |
441 | atomic_inc(&sk->sk_drops); |
442 | goto discard_and_relse; | |
443 | } | |
58a5a7b9 ACM |
444 | if (nested) |
445 | bh_lock_sock_nested(sk); | |
446 | else | |
447 | bh_lock_sock(sk); | |
a5b5bb9a IM |
448 | if (!sock_owned_by_user(sk)) { |
449 | /* | |
450 | * trylock + unlock semantics: | |
451 | */ | |
452 | mutex_acquire(&sk->sk_lock.dep_map, 0, 1, _RET_IP_); | |
453 | ||
c57943a1 | 454 | rc = sk_backlog_rcv(sk, skb); |
a5b5bb9a IM |
455 | |
456 | mutex_release(&sk->sk_lock.dep_map, 1, _RET_IP_); | |
f545a38f | 457 | } else if (sk_add_backlog(sk, skb, sk->sk_rcvbuf)) { |
8eae939f ZY |
458 | bh_unlock_sock(sk); |
459 | atomic_inc(&sk->sk_drops); | |
460 | goto discard_and_relse; | |
461 | } | |
462 | ||
f0088a50 DV |
463 | bh_unlock_sock(sk); |
464 | out: | |
465 | sock_put(sk); | |
466 | return rc; | |
467 | discard_and_relse: | |
468 | kfree_skb(skb); | |
469 | goto out; | |
470 | } | |
471 | EXPORT_SYMBOL(sk_receive_skb); | |
472 | ||
ea94ff3b KK |
473 | void sk_reset_txq(struct sock *sk) |
474 | { | |
475 | sk_tx_queue_clear(sk); | |
476 | } | |
477 | EXPORT_SYMBOL(sk_reset_txq); | |
478 | ||
f0088a50 DV |
479 | struct dst_entry *__sk_dst_check(struct sock *sk, u32 cookie) |
480 | { | |
b6c6712a | 481 | struct dst_entry *dst = __sk_dst_get(sk); |
f0088a50 DV |
482 | |
483 | if (dst && dst->obsolete && dst->ops->check(dst, cookie) == NULL) { | |
e022f0b4 | 484 | sk_tx_queue_clear(sk); |
a9b3cd7f | 485 | RCU_INIT_POINTER(sk->sk_dst_cache, NULL); |
f0088a50 DV |
486 | dst_release(dst); |
487 | return NULL; | |
488 | } | |
489 | ||
490 | return dst; | |
491 | } | |
492 | EXPORT_SYMBOL(__sk_dst_check); | |
493 | ||
494 | struct dst_entry *sk_dst_check(struct sock *sk, u32 cookie) | |
495 | { | |
496 | struct dst_entry *dst = sk_dst_get(sk); | |
497 | ||
498 | if (dst && dst->obsolete && dst->ops->check(dst, cookie) == NULL) { | |
499 | sk_dst_reset(sk); | |
500 | dst_release(dst); | |
501 | return NULL; | |
502 | } | |
503 | ||
504 | return dst; | |
505 | } | |
506 | EXPORT_SYMBOL(sk_dst_check); | |
507 | ||
4878809f DM |
508 | static int sock_bindtodevice(struct sock *sk, char __user *optval, int optlen) |
509 | { | |
510 | int ret = -ENOPROTOOPT; | |
511 | #ifdef CONFIG_NETDEVICES | |
3b1e0a65 | 512 | struct net *net = sock_net(sk); |
4878809f DM |
513 | char devname[IFNAMSIZ]; |
514 | int index; | |
515 | ||
516 | /* Sorry... */ | |
517 | ret = -EPERM; | |
518 | if (!capable(CAP_NET_RAW)) | |
519 | goto out; | |
520 | ||
521 | ret = -EINVAL; | |
522 | if (optlen < 0) | |
523 | goto out; | |
524 | ||
525 | /* Bind this socket to a particular device like "eth0", | |
526 | * as specified in the passed interface name. If the | |
527 | * name is "" or the option length is zero the socket | |
528 | * is not bound. | |
529 | */ | |
530 | if (optlen > IFNAMSIZ - 1) | |
531 | optlen = IFNAMSIZ - 1; | |
532 | memset(devname, 0, sizeof(devname)); | |
533 | ||
534 | ret = -EFAULT; | |
535 | if (copy_from_user(devname, optval, optlen)) | |
536 | goto out; | |
537 | ||
000ba2e4 DM |
538 | index = 0; |
539 | if (devname[0] != '\0') { | |
bf8e56bf | 540 | struct net_device *dev; |
4878809f | 541 | |
bf8e56bf ED |
542 | rcu_read_lock(); |
543 | dev = dev_get_by_name_rcu(net, devname); | |
544 | if (dev) | |
545 | index = dev->ifindex; | |
546 | rcu_read_unlock(); | |
4878809f DM |
547 | ret = -ENODEV; |
548 | if (!dev) | |
549 | goto out; | |
4878809f DM |
550 | } |
551 | ||
552 | lock_sock(sk); | |
553 | sk->sk_bound_dev_if = index; | |
554 | sk_dst_reset(sk); | |
555 | release_sock(sk); | |
556 | ||
557 | ret = 0; | |
558 | ||
559 | out: | |
560 | #endif | |
561 | ||
562 | return ret; | |
563 | } | |
564 | ||
c0ef877b PE |
565 | static inline void sock_valbool_flag(struct sock *sk, int bit, int valbool) |
566 | { | |
567 | if (valbool) | |
568 | sock_set_flag(sk, bit); | |
569 | else | |
570 | sock_reset_flag(sk, bit); | |
571 | } | |
572 | ||
1da177e4 LT |
573 | /* |
574 | * This is meant for all protocols to use and covers goings on | |
575 | * at the socket level. Everything here is generic. | |
576 | */ | |
577 | ||
578 | int sock_setsockopt(struct socket *sock, int level, int optname, | |
b7058842 | 579 | char __user *optval, unsigned int optlen) |
1da177e4 | 580 | { |
2a91525c | 581 | struct sock *sk = sock->sk; |
1da177e4 LT |
582 | int val; |
583 | int valbool; | |
584 | struct linger ling; | |
585 | int ret = 0; | |
4ec93edb | 586 | |
1da177e4 LT |
587 | /* |
588 | * Options without arguments | |
589 | */ | |
590 | ||
4878809f DM |
591 | if (optname == SO_BINDTODEVICE) |
592 | return sock_bindtodevice(sk, optval, optlen); | |
593 | ||
e71a4783 SH |
594 | if (optlen < sizeof(int)) |
595 | return -EINVAL; | |
4ec93edb | 596 | |
1da177e4 LT |
597 | if (get_user(val, (int __user *)optval)) |
598 | return -EFAULT; | |
4ec93edb | 599 | |
2a91525c | 600 | valbool = val ? 1 : 0; |
1da177e4 LT |
601 | |
602 | lock_sock(sk); | |
603 | ||
2a91525c | 604 | switch (optname) { |
e71a4783 | 605 | case SO_DEBUG: |
2a91525c | 606 | if (val && !capable(CAP_NET_ADMIN)) |
e71a4783 | 607 | ret = -EACCES; |
2a91525c | 608 | else |
c0ef877b | 609 | sock_valbool_flag(sk, SOCK_DBG, valbool); |
e71a4783 SH |
610 | break; |
611 | case SO_REUSEADDR: | |
4a17fd52 | 612 | sk->sk_reuse = (valbool ? SK_CAN_REUSE : SK_NO_REUSE); |
e71a4783 SH |
613 | break; |
614 | case SO_TYPE: | |
49c794e9 | 615 | case SO_PROTOCOL: |
0d6038ee | 616 | case SO_DOMAIN: |
e71a4783 SH |
617 | case SO_ERROR: |
618 | ret = -ENOPROTOOPT; | |
619 | break; | |
620 | case SO_DONTROUTE: | |
c0ef877b | 621 | sock_valbool_flag(sk, SOCK_LOCALROUTE, valbool); |
e71a4783 SH |
622 | break; |
623 | case SO_BROADCAST: | |
624 | sock_valbool_flag(sk, SOCK_BROADCAST, valbool); | |
625 | break; | |
626 | case SO_SNDBUF: | |
627 | /* Don't error on this BSD doesn't and if you think | |
82981930 ED |
628 | * about it this is right. Otherwise apps have to |
629 | * play 'guess the biggest size' games. RCVBUF/SNDBUF | |
630 | * are treated in BSD as hints | |
631 | */ | |
632 | val = min_t(u32, val, sysctl_wmem_max); | |
b0573dea | 633 | set_sndbuf: |
e71a4783 | 634 | sk->sk_userlocks |= SOCK_SNDBUF_LOCK; |
82981930 ED |
635 | sk->sk_sndbuf = max_t(u32, val * 2, SOCK_MIN_SNDBUF); |
636 | /* Wake up sending tasks if we upped the value. */ | |
e71a4783 SH |
637 | sk->sk_write_space(sk); |
638 | break; | |
1da177e4 | 639 | |
e71a4783 SH |
640 | case SO_SNDBUFFORCE: |
641 | if (!capable(CAP_NET_ADMIN)) { | |
642 | ret = -EPERM; | |
643 | break; | |
644 | } | |
645 | goto set_sndbuf; | |
b0573dea | 646 | |
e71a4783 SH |
647 | case SO_RCVBUF: |
648 | /* Don't error on this BSD doesn't and if you think | |
82981930 ED |
649 | * about it this is right. Otherwise apps have to |
650 | * play 'guess the biggest size' games. RCVBUF/SNDBUF | |
651 | * are treated in BSD as hints | |
652 | */ | |
653 | val = min_t(u32, val, sysctl_rmem_max); | |
b0573dea | 654 | set_rcvbuf: |
e71a4783 SH |
655 | sk->sk_userlocks |= SOCK_RCVBUF_LOCK; |
656 | /* | |
657 | * We double it on the way in to account for | |
658 | * "struct sk_buff" etc. overhead. Applications | |
659 | * assume that the SO_RCVBUF setting they make will | |
660 | * allow that much actual data to be received on that | |
661 | * socket. | |
662 | * | |
663 | * Applications are unaware that "struct sk_buff" and | |
664 | * other overheads allocate from the receive buffer | |
665 | * during socket buffer allocation. | |
666 | * | |
667 | * And after considering the possible alternatives, | |
668 | * returning the value we actually used in getsockopt | |
669 | * is the most desirable behavior. | |
670 | */ | |
82981930 | 671 | sk->sk_rcvbuf = max_t(u32, val * 2, SOCK_MIN_RCVBUF); |
e71a4783 SH |
672 | break; |
673 | ||
674 | case SO_RCVBUFFORCE: | |
675 | if (!capable(CAP_NET_ADMIN)) { | |
676 | ret = -EPERM; | |
1da177e4 | 677 | break; |
e71a4783 SH |
678 | } |
679 | goto set_rcvbuf; | |
1da177e4 | 680 | |
e71a4783 | 681 | case SO_KEEPALIVE: |
1da177e4 | 682 | #ifdef CONFIG_INET |
3e10986d ED |
683 | if (sk->sk_protocol == IPPROTO_TCP && |
684 | sk->sk_type == SOCK_STREAM) | |
e71a4783 | 685 | tcp_set_keepalive(sk, valbool); |
1da177e4 | 686 | #endif |
e71a4783 SH |
687 | sock_valbool_flag(sk, SOCK_KEEPOPEN, valbool); |
688 | break; | |
689 | ||
690 | case SO_OOBINLINE: | |
691 | sock_valbool_flag(sk, SOCK_URGINLINE, valbool); | |
692 | break; | |
693 | ||
694 | case SO_NO_CHECK: | |
695 | sk->sk_no_check = valbool; | |
696 | break; | |
697 | ||
698 | case SO_PRIORITY: | |
699 | if ((val >= 0 && val <= 6) || capable(CAP_NET_ADMIN)) | |
700 | sk->sk_priority = val; | |
701 | else | |
702 | ret = -EPERM; | |
703 | break; | |
704 | ||
705 | case SO_LINGER: | |
706 | if (optlen < sizeof(ling)) { | |
707 | ret = -EINVAL; /* 1003.1g */ | |
1da177e4 | 708 | break; |
e71a4783 | 709 | } |
2a91525c | 710 | if (copy_from_user(&ling, optval, sizeof(ling))) { |
e71a4783 | 711 | ret = -EFAULT; |
1da177e4 | 712 | break; |
e71a4783 SH |
713 | } |
714 | if (!ling.l_onoff) | |
715 | sock_reset_flag(sk, SOCK_LINGER); | |
716 | else { | |
1da177e4 | 717 | #if (BITS_PER_LONG == 32) |
e71a4783 SH |
718 | if ((unsigned int)ling.l_linger >= MAX_SCHEDULE_TIMEOUT/HZ) |
719 | sk->sk_lingertime = MAX_SCHEDULE_TIMEOUT; | |
1da177e4 | 720 | else |
e71a4783 SH |
721 | #endif |
722 | sk->sk_lingertime = (unsigned int)ling.l_linger * HZ; | |
723 | sock_set_flag(sk, SOCK_LINGER); | |
724 | } | |
725 | break; | |
726 | ||
727 | case SO_BSDCOMPAT: | |
728 | sock_warn_obsolete_bsdism("setsockopt"); | |
729 | break; | |
730 | ||
731 | case SO_PASSCRED: | |
732 | if (valbool) | |
733 | set_bit(SOCK_PASSCRED, &sock->flags); | |
734 | else | |
735 | clear_bit(SOCK_PASSCRED, &sock->flags); | |
736 | break; | |
737 | ||
738 | case SO_TIMESTAMP: | |
92f37fd2 | 739 | case SO_TIMESTAMPNS: |
e71a4783 | 740 | if (valbool) { |
92f37fd2 ED |
741 | if (optname == SO_TIMESTAMP) |
742 | sock_reset_flag(sk, SOCK_RCVTSTAMPNS); | |
743 | else | |
744 | sock_set_flag(sk, SOCK_RCVTSTAMPNS); | |
e71a4783 | 745 | sock_set_flag(sk, SOCK_RCVTSTAMP); |
20d49473 | 746 | sock_enable_timestamp(sk, SOCK_TIMESTAMP); |
92f37fd2 | 747 | } else { |
e71a4783 | 748 | sock_reset_flag(sk, SOCK_RCVTSTAMP); |
92f37fd2 ED |
749 | sock_reset_flag(sk, SOCK_RCVTSTAMPNS); |
750 | } | |
e71a4783 SH |
751 | break; |
752 | ||
20d49473 PO |
753 | case SO_TIMESTAMPING: |
754 | if (val & ~SOF_TIMESTAMPING_MASK) { | |
f249fb78 | 755 | ret = -EINVAL; |
20d49473 PO |
756 | break; |
757 | } | |
758 | sock_valbool_flag(sk, SOCK_TIMESTAMPING_TX_HARDWARE, | |
759 | val & SOF_TIMESTAMPING_TX_HARDWARE); | |
760 | sock_valbool_flag(sk, SOCK_TIMESTAMPING_TX_SOFTWARE, | |
761 | val & SOF_TIMESTAMPING_TX_SOFTWARE); | |
762 | sock_valbool_flag(sk, SOCK_TIMESTAMPING_RX_HARDWARE, | |
763 | val & SOF_TIMESTAMPING_RX_HARDWARE); | |
764 | if (val & SOF_TIMESTAMPING_RX_SOFTWARE) | |
765 | sock_enable_timestamp(sk, | |
766 | SOCK_TIMESTAMPING_RX_SOFTWARE); | |
767 | else | |
768 | sock_disable_timestamp(sk, | |
08e29af3 | 769 | (1UL << SOCK_TIMESTAMPING_RX_SOFTWARE)); |
20d49473 PO |
770 | sock_valbool_flag(sk, SOCK_TIMESTAMPING_SOFTWARE, |
771 | val & SOF_TIMESTAMPING_SOFTWARE); | |
772 | sock_valbool_flag(sk, SOCK_TIMESTAMPING_SYS_HARDWARE, | |
773 | val & SOF_TIMESTAMPING_SYS_HARDWARE); | |
774 | sock_valbool_flag(sk, SOCK_TIMESTAMPING_RAW_HARDWARE, | |
775 | val & SOF_TIMESTAMPING_RAW_HARDWARE); | |
776 | break; | |
777 | ||
e71a4783 SH |
778 | case SO_RCVLOWAT: |
779 | if (val < 0) | |
780 | val = INT_MAX; | |
781 | sk->sk_rcvlowat = val ? : 1; | |
782 | break; | |
783 | ||
784 | case SO_RCVTIMEO: | |
785 | ret = sock_set_timeout(&sk->sk_rcvtimeo, optval, optlen); | |
786 | break; | |
787 | ||
788 | case SO_SNDTIMEO: | |
789 | ret = sock_set_timeout(&sk->sk_sndtimeo, optval, optlen); | |
790 | break; | |
1da177e4 | 791 | |
e71a4783 SH |
792 | case SO_ATTACH_FILTER: |
793 | ret = -EINVAL; | |
794 | if (optlen == sizeof(struct sock_fprog)) { | |
795 | struct sock_fprog fprog; | |
1da177e4 | 796 | |
e71a4783 SH |
797 | ret = -EFAULT; |
798 | if (copy_from_user(&fprog, optval, sizeof(fprog))) | |
1da177e4 | 799 | break; |
e71a4783 SH |
800 | |
801 | ret = sk_attach_filter(&fprog, sk); | |
802 | } | |
803 | break; | |
804 | ||
805 | case SO_DETACH_FILTER: | |
55b33325 | 806 | ret = sk_detach_filter(sk); |
e71a4783 | 807 | break; |
1da177e4 | 808 | |
e71a4783 SH |
809 | case SO_PASSSEC: |
810 | if (valbool) | |
811 | set_bit(SOCK_PASSSEC, &sock->flags); | |
812 | else | |
813 | clear_bit(SOCK_PASSSEC, &sock->flags); | |
814 | break; | |
4a19ec58 LAT |
815 | case SO_MARK: |
816 | if (!capable(CAP_NET_ADMIN)) | |
817 | ret = -EPERM; | |
2a91525c | 818 | else |
4a19ec58 | 819 | sk->sk_mark = val; |
4a19ec58 | 820 | break; |
877ce7c1 | 821 | |
1da177e4 LT |
822 | /* We implement the SO_SNDLOWAT etc to |
823 | not be settable (1003.1g 5.3) */ | |
3b885787 | 824 | case SO_RXQ_OVFL: |
8083f0fc | 825 | sock_valbool_flag(sk, SOCK_RXQ_OVFL, valbool); |
3b885787 | 826 | break; |
6e3e939f JB |
827 | |
828 | case SO_WIFI_STATUS: | |
829 | sock_valbool_flag(sk, SOCK_WIFI_STATUS, valbool); | |
830 | break; | |
831 | ||
ef64a54f PE |
832 | case SO_PEEK_OFF: |
833 | if (sock->ops->set_peek_off) | |
834 | sock->ops->set_peek_off(sk, val); | |
835 | else | |
836 | ret = -EOPNOTSUPP; | |
837 | break; | |
3bdc0eba BG |
838 | |
839 | case SO_NOFCS: | |
840 | sock_valbool_flag(sk, SOCK_NOFCS, valbool); | |
841 | break; | |
842 | ||
e71a4783 SH |
843 | default: |
844 | ret = -ENOPROTOOPT; | |
845 | break; | |
4ec93edb | 846 | } |
1da177e4 LT |
847 | release_sock(sk); |
848 | return ret; | |
849 | } | |
2a91525c | 850 | EXPORT_SYMBOL(sock_setsockopt); |
1da177e4 LT |
851 | |
852 | ||
3f551f94 EB |
853 | void cred_to_ucred(struct pid *pid, const struct cred *cred, |
854 | struct ucred *ucred) | |
855 | { | |
856 | ucred->pid = pid_vnr(pid); | |
857 | ucred->uid = ucred->gid = -1; | |
858 | if (cred) { | |
859 | struct user_namespace *current_ns = current_user_ns(); | |
860 | ||
b2e4f544 EB |
861 | ucred->uid = from_kuid_munged(current_ns, cred->euid); |
862 | ucred->gid = from_kgid_munged(current_ns, cred->egid); | |
3f551f94 EB |
863 | } |
864 | } | |
3924773a | 865 | EXPORT_SYMBOL_GPL(cred_to_ucred); |
3f551f94 | 866 | |
1da177e4 LT |
867 | int sock_getsockopt(struct socket *sock, int level, int optname, |
868 | char __user *optval, int __user *optlen) | |
869 | { | |
870 | struct sock *sk = sock->sk; | |
4ec93edb | 871 | |
e71a4783 | 872 | union { |
4ec93edb YH |
873 | int val; |
874 | struct linger ling; | |
1da177e4 LT |
875 | struct timeval tm; |
876 | } v; | |
4ec93edb | 877 | |
4d0392be | 878 | int lv = sizeof(int); |
1da177e4 | 879 | int len; |
4ec93edb | 880 | |
e71a4783 | 881 | if (get_user(len, optlen)) |
4ec93edb | 882 | return -EFAULT; |
e71a4783 | 883 | if (len < 0) |
1da177e4 | 884 | return -EINVAL; |
4ec93edb | 885 | |
50fee1de | 886 | memset(&v, 0, sizeof(v)); |
df0bca04 | 887 | |
2a91525c | 888 | switch (optname) { |
e71a4783 SH |
889 | case SO_DEBUG: |
890 | v.val = sock_flag(sk, SOCK_DBG); | |
891 | break; | |
892 | ||
893 | case SO_DONTROUTE: | |
894 | v.val = sock_flag(sk, SOCK_LOCALROUTE); | |
895 | break; | |
896 | ||
897 | case SO_BROADCAST: | |
1b23a5df | 898 | v.val = sock_flag(sk, SOCK_BROADCAST); |
e71a4783 SH |
899 | break; |
900 | ||
901 | case SO_SNDBUF: | |
902 | v.val = sk->sk_sndbuf; | |
903 | break; | |
904 | ||
905 | case SO_RCVBUF: | |
906 | v.val = sk->sk_rcvbuf; | |
907 | break; | |
908 | ||
909 | case SO_REUSEADDR: | |
910 | v.val = sk->sk_reuse; | |
911 | break; | |
912 | ||
913 | case SO_KEEPALIVE: | |
1b23a5df | 914 | v.val = sock_flag(sk, SOCK_KEEPOPEN); |
e71a4783 SH |
915 | break; |
916 | ||
917 | case SO_TYPE: | |
918 | v.val = sk->sk_type; | |
919 | break; | |
920 | ||
49c794e9 JE |
921 | case SO_PROTOCOL: |
922 | v.val = sk->sk_protocol; | |
923 | break; | |
924 | ||
0d6038ee JE |
925 | case SO_DOMAIN: |
926 | v.val = sk->sk_family; | |
927 | break; | |
928 | ||
e71a4783 SH |
929 | case SO_ERROR: |
930 | v.val = -sock_error(sk); | |
2a91525c | 931 | if (v.val == 0) |
e71a4783 SH |
932 | v.val = xchg(&sk->sk_err_soft, 0); |
933 | break; | |
934 | ||
935 | case SO_OOBINLINE: | |
1b23a5df | 936 | v.val = sock_flag(sk, SOCK_URGINLINE); |
e71a4783 SH |
937 | break; |
938 | ||
939 | case SO_NO_CHECK: | |
940 | v.val = sk->sk_no_check; | |
941 | break; | |
942 | ||
943 | case SO_PRIORITY: | |
944 | v.val = sk->sk_priority; | |
945 | break; | |
946 | ||
947 | case SO_LINGER: | |
948 | lv = sizeof(v.ling); | |
1b23a5df | 949 | v.ling.l_onoff = sock_flag(sk, SOCK_LINGER); |
e71a4783 SH |
950 | v.ling.l_linger = sk->sk_lingertime / HZ; |
951 | break; | |
952 | ||
953 | case SO_BSDCOMPAT: | |
954 | sock_warn_obsolete_bsdism("getsockopt"); | |
955 | break; | |
956 | ||
957 | case SO_TIMESTAMP: | |
92f37fd2 ED |
958 | v.val = sock_flag(sk, SOCK_RCVTSTAMP) && |
959 | !sock_flag(sk, SOCK_RCVTSTAMPNS); | |
960 | break; | |
961 | ||
962 | case SO_TIMESTAMPNS: | |
963 | v.val = sock_flag(sk, SOCK_RCVTSTAMPNS); | |
e71a4783 SH |
964 | break; |
965 | ||
20d49473 PO |
966 | case SO_TIMESTAMPING: |
967 | v.val = 0; | |
968 | if (sock_flag(sk, SOCK_TIMESTAMPING_TX_HARDWARE)) | |
969 | v.val |= SOF_TIMESTAMPING_TX_HARDWARE; | |
970 | if (sock_flag(sk, SOCK_TIMESTAMPING_TX_SOFTWARE)) | |
971 | v.val |= SOF_TIMESTAMPING_TX_SOFTWARE; | |
972 | if (sock_flag(sk, SOCK_TIMESTAMPING_RX_HARDWARE)) | |
973 | v.val |= SOF_TIMESTAMPING_RX_HARDWARE; | |
974 | if (sock_flag(sk, SOCK_TIMESTAMPING_RX_SOFTWARE)) | |
975 | v.val |= SOF_TIMESTAMPING_RX_SOFTWARE; | |
976 | if (sock_flag(sk, SOCK_TIMESTAMPING_SOFTWARE)) | |
977 | v.val |= SOF_TIMESTAMPING_SOFTWARE; | |
978 | if (sock_flag(sk, SOCK_TIMESTAMPING_SYS_HARDWARE)) | |
979 | v.val |= SOF_TIMESTAMPING_SYS_HARDWARE; | |
980 | if (sock_flag(sk, SOCK_TIMESTAMPING_RAW_HARDWARE)) | |
981 | v.val |= SOF_TIMESTAMPING_RAW_HARDWARE; | |
982 | break; | |
983 | ||
e71a4783 | 984 | case SO_RCVTIMEO: |
2a91525c | 985 | lv = sizeof(struct timeval); |
e71a4783 SH |
986 | if (sk->sk_rcvtimeo == MAX_SCHEDULE_TIMEOUT) { |
987 | v.tm.tv_sec = 0; | |
988 | v.tm.tv_usec = 0; | |
989 | } else { | |
990 | v.tm.tv_sec = sk->sk_rcvtimeo / HZ; | |
991 | v.tm.tv_usec = ((sk->sk_rcvtimeo % HZ) * 1000000) / HZ; | |
992 | } | |
993 | break; | |
994 | ||
995 | case SO_SNDTIMEO: | |
2a91525c | 996 | lv = sizeof(struct timeval); |
e71a4783 SH |
997 | if (sk->sk_sndtimeo == MAX_SCHEDULE_TIMEOUT) { |
998 | v.tm.tv_sec = 0; | |
999 | v.tm.tv_usec = 0; | |
1000 | } else { | |
1001 | v.tm.tv_sec = sk->sk_sndtimeo / HZ; | |
1002 | v.tm.tv_usec = ((sk->sk_sndtimeo % HZ) * 1000000) / HZ; | |
1003 | } | |
1004 | break; | |
1da177e4 | 1005 | |
e71a4783 SH |
1006 | case SO_RCVLOWAT: |
1007 | v.val = sk->sk_rcvlowat; | |
1008 | break; | |
1da177e4 | 1009 | |
e71a4783 | 1010 | case SO_SNDLOWAT: |
2a91525c | 1011 | v.val = 1; |
e71a4783 | 1012 | break; |
1da177e4 | 1013 | |
e71a4783 | 1014 | case SO_PASSCRED: |
82981930 | 1015 | v.val = !!test_bit(SOCK_PASSCRED, &sock->flags); |
e71a4783 | 1016 | break; |
1da177e4 | 1017 | |
e71a4783 | 1018 | case SO_PEERCRED: |
109f6e39 EB |
1019 | { |
1020 | struct ucred peercred; | |
1021 | if (len > sizeof(peercred)) | |
1022 | len = sizeof(peercred); | |
1023 | cred_to_ucred(sk->sk_peer_pid, sk->sk_peer_cred, &peercred); | |
1024 | if (copy_to_user(optval, &peercred, len)) | |
e71a4783 SH |
1025 | return -EFAULT; |
1026 | goto lenout; | |
109f6e39 | 1027 | } |
1da177e4 | 1028 | |
e71a4783 SH |
1029 | case SO_PEERNAME: |
1030 | { | |
1031 | char address[128]; | |
1032 | ||
1033 | if (sock->ops->getname(sock, (struct sockaddr *)address, &lv, 2)) | |
1034 | return -ENOTCONN; | |
1035 | if (lv < len) | |
1036 | return -EINVAL; | |
1037 | if (copy_to_user(optval, address, len)) | |
1038 | return -EFAULT; | |
1039 | goto lenout; | |
1040 | } | |
1da177e4 | 1041 | |
e71a4783 SH |
1042 | /* Dubious BSD thing... Probably nobody even uses it, but |
1043 | * the UNIX standard wants it for whatever reason... -DaveM | |
1044 | */ | |
1045 | case SO_ACCEPTCONN: | |
1046 | v.val = sk->sk_state == TCP_LISTEN; | |
1047 | break; | |
1da177e4 | 1048 | |
e71a4783 | 1049 | case SO_PASSSEC: |
82981930 | 1050 | v.val = !!test_bit(SOCK_PASSSEC, &sock->flags); |
e71a4783 | 1051 | break; |
877ce7c1 | 1052 | |
e71a4783 SH |
1053 | case SO_PEERSEC: |
1054 | return security_socket_getpeersec_stream(sock, optval, optlen, len); | |
1da177e4 | 1055 | |
4a19ec58 LAT |
1056 | case SO_MARK: |
1057 | v.val = sk->sk_mark; | |
1058 | break; | |
1059 | ||
3b885787 | 1060 | case SO_RXQ_OVFL: |
1b23a5df | 1061 | v.val = sock_flag(sk, SOCK_RXQ_OVFL); |
3b885787 NH |
1062 | break; |
1063 | ||
6e3e939f | 1064 | case SO_WIFI_STATUS: |
1b23a5df | 1065 | v.val = sock_flag(sk, SOCK_WIFI_STATUS); |
6e3e939f JB |
1066 | break; |
1067 | ||
ef64a54f PE |
1068 | case SO_PEEK_OFF: |
1069 | if (!sock->ops->set_peek_off) | |
1070 | return -EOPNOTSUPP; | |
1071 | ||
1072 | v.val = sk->sk_peek_off; | |
1073 | break; | |
bc2f7996 | 1074 | case SO_NOFCS: |
1b23a5df | 1075 | v.val = sock_flag(sk, SOCK_NOFCS); |
bc2f7996 | 1076 | break; |
e71a4783 SH |
1077 | default: |
1078 | return -ENOPROTOOPT; | |
1da177e4 | 1079 | } |
e71a4783 | 1080 | |
1da177e4 LT |
1081 | if (len > lv) |
1082 | len = lv; | |
1083 | if (copy_to_user(optval, &v, len)) | |
1084 | return -EFAULT; | |
1085 | lenout: | |
4ec93edb YH |
1086 | if (put_user(len, optlen)) |
1087 | return -EFAULT; | |
1088 | return 0; | |
1da177e4 LT |
1089 | } |
1090 | ||
a5b5bb9a IM |
1091 | /* |
1092 | * Initialize an sk_lock. | |
1093 | * | |
1094 | * (We also register the sk_lock with the lock validator.) | |
1095 | */ | |
b6f99a21 | 1096 | static inline void sock_lock_init(struct sock *sk) |
a5b5bb9a | 1097 | { |
ed07536e PZ |
1098 | sock_lock_init_class_and_name(sk, |
1099 | af_family_slock_key_strings[sk->sk_family], | |
1100 | af_family_slock_keys + sk->sk_family, | |
1101 | af_family_key_strings[sk->sk_family], | |
1102 | af_family_keys + sk->sk_family); | |
a5b5bb9a IM |
1103 | } |
1104 | ||
4dc6dc71 ED |
1105 | /* |
1106 | * Copy all fields from osk to nsk but nsk->sk_refcnt must not change yet, | |
1107 | * even temporarly, because of RCU lookups. sk_node should also be left as is. | |
68835aba | 1108 | * We must not copy fields between sk_dontcopy_begin and sk_dontcopy_end |
4dc6dc71 | 1109 | */ |
f1a6c4da PE |
1110 | static void sock_copy(struct sock *nsk, const struct sock *osk) |
1111 | { | |
1112 | #ifdef CONFIG_SECURITY_NETWORK | |
1113 | void *sptr = nsk->sk_security; | |
1114 | #endif | |
68835aba ED |
1115 | memcpy(nsk, osk, offsetof(struct sock, sk_dontcopy_begin)); |
1116 | ||
1117 | memcpy(&nsk->sk_dontcopy_end, &osk->sk_dontcopy_end, | |
1118 | osk->sk_prot->obj_size - offsetof(struct sock, sk_dontcopy_end)); | |
1119 | ||
f1a6c4da PE |
1120 | #ifdef CONFIG_SECURITY_NETWORK |
1121 | nsk->sk_security = sptr; | |
1122 | security_sk_clone(osk, nsk); | |
1123 | #endif | |
1124 | } | |
1125 | ||
fcbdf09d OP |
1126 | /* |
1127 | * caches using SLAB_DESTROY_BY_RCU should let .next pointer from nulls nodes | |
1128 | * un-modified. Special care is taken when initializing object to zero. | |
1129 | */ | |
1130 | static inline void sk_prot_clear_nulls(struct sock *sk, int size) | |
1131 | { | |
1132 | if (offsetof(struct sock, sk_node.next) != 0) | |
1133 | memset(sk, 0, offsetof(struct sock, sk_node.next)); | |
1134 | memset(&sk->sk_node.pprev, 0, | |
1135 | size - offsetof(struct sock, sk_node.pprev)); | |
1136 | } | |
1137 | ||
1138 | void sk_prot_clear_portaddr_nulls(struct sock *sk, int size) | |
1139 | { | |
1140 | unsigned long nulls1, nulls2; | |
1141 | ||
1142 | nulls1 = offsetof(struct sock, __sk_common.skc_node.next); | |
1143 | nulls2 = offsetof(struct sock, __sk_common.skc_portaddr_node.next); | |
1144 | if (nulls1 > nulls2) | |
1145 | swap(nulls1, nulls2); | |
1146 | ||
1147 | if (nulls1 != 0) | |
1148 | memset((char *)sk, 0, nulls1); | |
1149 | memset((char *)sk + nulls1 + sizeof(void *), 0, | |
1150 | nulls2 - nulls1 - sizeof(void *)); | |
1151 | memset((char *)sk + nulls2 + sizeof(void *), 0, | |
1152 | size - nulls2 - sizeof(void *)); | |
1153 | } | |
1154 | EXPORT_SYMBOL(sk_prot_clear_portaddr_nulls); | |
1155 | ||
2e4afe7b PE |
1156 | static struct sock *sk_prot_alloc(struct proto *prot, gfp_t priority, |
1157 | int family) | |
c308c1b2 PE |
1158 | { |
1159 | struct sock *sk; | |
1160 | struct kmem_cache *slab; | |
1161 | ||
1162 | slab = prot->slab; | |
e912b114 ED |
1163 | if (slab != NULL) { |
1164 | sk = kmem_cache_alloc(slab, priority & ~__GFP_ZERO); | |
1165 | if (!sk) | |
1166 | return sk; | |
1167 | if (priority & __GFP_ZERO) { | |
fcbdf09d OP |
1168 | if (prot->clear_sk) |
1169 | prot->clear_sk(sk, prot->obj_size); | |
1170 | else | |
1171 | sk_prot_clear_nulls(sk, prot->obj_size); | |
e912b114 | 1172 | } |
fcbdf09d | 1173 | } else |
c308c1b2 PE |
1174 | sk = kmalloc(prot->obj_size, priority); |
1175 | ||
2e4afe7b | 1176 | if (sk != NULL) { |
a98b65a3 VN |
1177 | kmemcheck_annotate_bitfield(sk, flags); |
1178 | ||
2e4afe7b PE |
1179 | if (security_sk_alloc(sk, family, priority)) |
1180 | goto out_free; | |
1181 | ||
1182 | if (!try_module_get(prot->owner)) | |
1183 | goto out_free_sec; | |
e022f0b4 | 1184 | sk_tx_queue_clear(sk); |
2e4afe7b PE |
1185 | } |
1186 | ||
c308c1b2 | 1187 | return sk; |
2e4afe7b PE |
1188 | |
1189 | out_free_sec: | |
1190 | security_sk_free(sk); | |
1191 | out_free: | |
1192 | if (slab != NULL) | |
1193 | kmem_cache_free(slab, sk); | |
1194 | else | |
1195 | kfree(sk); | |
1196 | return NULL; | |
c308c1b2 PE |
1197 | } |
1198 | ||
1199 | static void sk_prot_free(struct proto *prot, struct sock *sk) | |
1200 | { | |
1201 | struct kmem_cache *slab; | |
2e4afe7b | 1202 | struct module *owner; |
c308c1b2 | 1203 | |
2e4afe7b | 1204 | owner = prot->owner; |
c308c1b2 | 1205 | slab = prot->slab; |
2e4afe7b PE |
1206 | |
1207 | security_sk_free(sk); | |
c308c1b2 PE |
1208 | if (slab != NULL) |
1209 | kmem_cache_free(slab, sk); | |
1210 | else | |
1211 | kfree(sk); | |
2e4afe7b | 1212 | module_put(owner); |
c308c1b2 PE |
1213 | } |
1214 | ||
f8451725 | 1215 | #ifdef CONFIG_CGROUPS |
8fb974c9 | 1216 | #if IS_ENABLED(CONFIG_NET_CLS_CGROUP) |
f8451725 HX |
1217 | void sock_update_classid(struct sock *sk) |
1218 | { | |
1144182a | 1219 | u32 classid; |
f8451725 | 1220 | |
1144182a PM |
1221 | rcu_read_lock(); /* doing current task, which cannot vanish. */ |
1222 | classid = task_cls_classid(current); | |
1223 | rcu_read_unlock(); | |
3afa6d00 | 1224 | if (classid != sk->sk_classid) |
f8451725 HX |
1225 | sk->sk_classid = classid; |
1226 | } | |
82862742 | 1227 | EXPORT_SYMBOL(sock_update_classid); |
8fb974c9 | 1228 | #endif |
5bc1421e | 1229 | |
51e4e7fa | 1230 | #if IS_ENABLED(CONFIG_NETPRIO_CGROUP) |
406a3c63 | 1231 | void sock_update_netprioidx(struct sock *sk, struct task_struct *task) |
5bc1421e | 1232 | { |
5bc1421e NH |
1233 | if (in_interrupt()) |
1234 | return; | |
2b73bc65 | 1235 | |
406a3c63 | 1236 | sk->sk_cgrp_prioidx = task_netprioidx(task); |
5bc1421e NH |
1237 | } |
1238 | EXPORT_SYMBOL_GPL(sock_update_netprioidx); | |
f8451725 | 1239 | #endif |
51e4e7fa | 1240 | #endif |
f8451725 | 1241 | |
1da177e4 LT |
1242 | /** |
1243 | * sk_alloc - All socket objects are allocated here | |
c4ea43c5 | 1244 | * @net: the applicable net namespace |
4dc3b16b PP |
1245 | * @family: protocol family |
1246 | * @priority: for allocation (%GFP_KERNEL, %GFP_ATOMIC, etc) | |
1247 | * @prot: struct proto associated with this new sock instance | |
1da177e4 | 1248 | */ |
1b8d7ae4 | 1249 | struct sock *sk_alloc(struct net *net, int family, gfp_t priority, |
6257ff21 | 1250 | struct proto *prot) |
1da177e4 | 1251 | { |
c308c1b2 | 1252 | struct sock *sk; |
1da177e4 | 1253 | |
154adbc8 | 1254 | sk = sk_prot_alloc(prot, priority | __GFP_ZERO, family); |
1da177e4 | 1255 | if (sk) { |
154adbc8 PE |
1256 | sk->sk_family = family; |
1257 | /* | |
1258 | * See comment in struct sock definition to understand | |
1259 | * why we need sk_prot_creator -acme | |
1260 | */ | |
1261 | sk->sk_prot = sk->sk_prot_creator = prot; | |
1262 | sock_lock_init(sk); | |
3b1e0a65 | 1263 | sock_net_set(sk, get_net(net)); |
d66ee058 | 1264 | atomic_set(&sk->sk_wmem_alloc, 1); |
f8451725 HX |
1265 | |
1266 | sock_update_classid(sk); | |
406a3c63 | 1267 | sock_update_netprioidx(sk, current); |
1da177e4 | 1268 | } |
a79af59e | 1269 | |
2e4afe7b | 1270 | return sk; |
1da177e4 | 1271 | } |
2a91525c | 1272 | EXPORT_SYMBOL(sk_alloc); |
1da177e4 | 1273 | |
2b85a34e | 1274 | static void __sk_free(struct sock *sk) |
1da177e4 LT |
1275 | { |
1276 | struct sk_filter *filter; | |
1da177e4 LT |
1277 | |
1278 | if (sk->sk_destruct) | |
1279 | sk->sk_destruct(sk); | |
1280 | ||
a898def2 PM |
1281 | filter = rcu_dereference_check(sk->sk_filter, |
1282 | atomic_read(&sk->sk_wmem_alloc) == 0); | |
1da177e4 | 1283 | if (filter) { |
309dd5fc | 1284 | sk_filter_uncharge(sk, filter); |
a9b3cd7f | 1285 | RCU_INIT_POINTER(sk->sk_filter, NULL); |
1da177e4 LT |
1286 | } |
1287 | ||
08e29af3 | 1288 | sock_disable_timestamp(sk, SK_FLAGS_TIMESTAMP); |
1da177e4 LT |
1289 | |
1290 | if (atomic_read(&sk->sk_omem_alloc)) | |
e005d193 JP |
1291 | pr_debug("%s: optmem leakage (%d bytes) detected\n", |
1292 | __func__, atomic_read(&sk->sk_omem_alloc)); | |
1da177e4 | 1293 | |
109f6e39 EB |
1294 | if (sk->sk_peer_cred) |
1295 | put_cred(sk->sk_peer_cred); | |
1296 | put_pid(sk->sk_peer_pid); | |
3b1e0a65 | 1297 | put_net(sock_net(sk)); |
c308c1b2 | 1298 | sk_prot_free(sk->sk_prot_creator, sk); |
1da177e4 | 1299 | } |
2b85a34e ED |
1300 | |
1301 | void sk_free(struct sock *sk) | |
1302 | { | |
1303 | /* | |
25985edc | 1304 | * We subtract one from sk_wmem_alloc and can know if |
2b85a34e ED |
1305 | * some packets are still in some tx queue. |
1306 | * If not null, sock_wfree() will call __sk_free(sk) later | |
1307 | */ | |
1308 | if (atomic_dec_and_test(&sk->sk_wmem_alloc)) | |
1309 | __sk_free(sk); | |
1310 | } | |
2a91525c | 1311 | EXPORT_SYMBOL(sk_free); |
1da177e4 | 1312 | |
edf02087 | 1313 | /* |
25985edc LDM |
1314 | * Last sock_put should drop reference to sk->sk_net. It has already |
1315 | * been dropped in sk_change_net. Taking reference to stopping namespace | |
edf02087 | 1316 | * is not an option. |
25985edc | 1317 | * Take reference to a socket to remove it from hash _alive_ and after that |
edf02087 DL |
1318 | * destroy it in the context of init_net. |
1319 | */ | |
1320 | void sk_release_kernel(struct sock *sk) | |
1321 | { | |
1322 | if (sk == NULL || sk->sk_socket == NULL) | |
1323 | return; | |
1324 | ||
1325 | sock_hold(sk); | |
1326 | sock_release(sk->sk_socket); | |
65a18ec5 | 1327 | release_net(sock_net(sk)); |
3b1e0a65 | 1328 | sock_net_set(sk, get_net(&init_net)); |
edf02087 DL |
1329 | sock_put(sk); |
1330 | } | |
45af1754 | 1331 | EXPORT_SYMBOL(sk_release_kernel); |
edf02087 | 1332 | |
475f1b52 SR |
1333 | static void sk_update_clone(const struct sock *sk, struct sock *newsk) |
1334 | { | |
1335 | if (mem_cgroup_sockets_enabled && sk->sk_cgrp) | |
1336 | sock_update_memcg(newsk); | |
1337 | } | |
1338 | ||
e56c57d0 ED |
1339 | /** |
1340 | * sk_clone_lock - clone a socket, and lock its clone | |
1341 | * @sk: the socket to clone | |
1342 | * @priority: for allocation (%GFP_KERNEL, %GFP_ATOMIC, etc) | |
1343 | * | |
1344 | * Caller must unlock socket even in error path (bh_unlock_sock(newsk)) | |
1345 | */ | |
1346 | struct sock *sk_clone_lock(const struct sock *sk, const gfp_t priority) | |
87d11ceb | 1347 | { |
8fd1d178 | 1348 | struct sock *newsk; |
87d11ceb | 1349 | |
8fd1d178 | 1350 | newsk = sk_prot_alloc(sk->sk_prot, priority, sk->sk_family); |
87d11ceb ACM |
1351 | if (newsk != NULL) { |
1352 | struct sk_filter *filter; | |
1353 | ||
892c141e | 1354 | sock_copy(newsk, sk); |
87d11ceb ACM |
1355 | |
1356 | /* SANITY */ | |
3b1e0a65 | 1357 | get_net(sock_net(newsk)); |
87d11ceb ACM |
1358 | sk_node_init(&newsk->sk_node); |
1359 | sock_lock_init(newsk); | |
1360 | bh_lock_sock(newsk); | |
fa438ccf | 1361 | newsk->sk_backlog.head = newsk->sk_backlog.tail = NULL; |
8eae939f | 1362 | newsk->sk_backlog.len = 0; |
87d11ceb ACM |
1363 | |
1364 | atomic_set(&newsk->sk_rmem_alloc, 0); | |
2b85a34e ED |
1365 | /* |
1366 | * sk_wmem_alloc set to one (see sk_free() and sock_wfree()) | |
1367 | */ | |
1368 | atomic_set(&newsk->sk_wmem_alloc, 1); | |
87d11ceb ACM |
1369 | atomic_set(&newsk->sk_omem_alloc, 0); |
1370 | skb_queue_head_init(&newsk->sk_receive_queue); | |
1371 | skb_queue_head_init(&newsk->sk_write_queue); | |
97fc2f08 CL |
1372 | #ifdef CONFIG_NET_DMA |
1373 | skb_queue_head_init(&newsk->sk_async_wait_queue); | |
1374 | #endif | |
87d11ceb | 1375 | |
b6c6712a | 1376 | spin_lock_init(&newsk->sk_dst_lock); |
87d11ceb | 1377 | rwlock_init(&newsk->sk_callback_lock); |
443aef0e PZ |
1378 | lockdep_set_class_and_name(&newsk->sk_callback_lock, |
1379 | af_callback_keys + newsk->sk_family, | |
1380 | af_family_clock_key_strings[newsk->sk_family]); | |
87d11ceb ACM |
1381 | |
1382 | newsk->sk_dst_cache = NULL; | |
1383 | newsk->sk_wmem_queued = 0; | |
1384 | newsk->sk_forward_alloc = 0; | |
1385 | newsk->sk_send_head = NULL; | |
87d11ceb ACM |
1386 | newsk->sk_userlocks = sk->sk_userlocks & ~SOCK_BINDPORT_LOCK; |
1387 | ||
1388 | sock_reset_flag(newsk, SOCK_DONE); | |
1389 | skb_queue_head_init(&newsk->sk_error_queue); | |
1390 | ||
0d7da9dd | 1391 | filter = rcu_dereference_protected(newsk->sk_filter, 1); |
87d11ceb ACM |
1392 | if (filter != NULL) |
1393 | sk_filter_charge(newsk, filter); | |
1394 | ||
1395 | if (unlikely(xfrm_sk_clone_policy(newsk))) { | |
1396 | /* It is still raw copy of parent, so invalidate | |
1397 | * destructor and make plain sk_free() */ | |
1398 | newsk->sk_destruct = NULL; | |
b0691c8e | 1399 | bh_unlock_sock(newsk); |
87d11ceb ACM |
1400 | sk_free(newsk); |
1401 | newsk = NULL; | |
1402 | goto out; | |
1403 | } | |
1404 | ||
1405 | newsk->sk_err = 0; | |
1406 | newsk->sk_priority = 0; | |
4dc6dc71 ED |
1407 | /* |
1408 | * Before updating sk_refcnt, we must commit prior changes to memory | |
1409 | * (Documentation/RCU/rculist_nulls.txt for details) | |
1410 | */ | |
1411 | smp_wmb(); | |
87d11ceb ACM |
1412 | atomic_set(&newsk->sk_refcnt, 2); |
1413 | ||
1414 | /* | |
1415 | * Increment the counter in the same struct proto as the master | |
1416 | * sock (sk_refcnt_debug_inc uses newsk->sk_prot->socks, that | |
1417 | * is the same as sk->sk_prot->socks, as this field was copied | |
1418 | * with memcpy). | |
1419 | * | |
1420 | * This _changes_ the previous behaviour, where | |
1421 | * tcp_create_openreq_child always was incrementing the | |
1422 | * equivalent to tcp_prot->socks (inet_sock_nr), so this have | |
1423 | * to be taken into account in all callers. -acme | |
1424 | */ | |
1425 | sk_refcnt_debug_inc(newsk); | |
972692e0 | 1426 | sk_set_socket(newsk, NULL); |
43815482 | 1427 | newsk->sk_wq = NULL; |
87d11ceb | 1428 | |
f3f511e1 GC |
1429 | sk_update_clone(sk, newsk); |
1430 | ||
87d11ceb | 1431 | if (newsk->sk_prot->sockets_allocated) |
180d8cd9 | 1432 | sk_sockets_allocated_inc(newsk); |
704da560 | 1433 | |
08e29af3 | 1434 | if (newsk->sk_flags & SK_FLAGS_TIMESTAMP) |
704da560 | 1435 | net_enable_timestamp(); |
87d11ceb ACM |
1436 | } |
1437 | out: | |
1438 | return newsk; | |
1439 | } | |
e56c57d0 | 1440 | EXPORT_SYMBOL_GPL(sk_clone_lock); |
87d11ceb | 1441 | |
9958089a AK |
1442 | void sk_setup_caps(struct sock *sk, struct dst_entry *dst) |
1443 | { | |
1444 | __sk_dst_set(sk, dst); | |
1445 | sk->sk_route_caps = dst->dev->features; | |
1446 | if (sk->sk_route_caps & NETIF_F_GSO) | |
4fcd6b99 | 1447 | sk->sk_route_caps |= NETIF_F_GSO_SOFTWARE; |
a465419b | 1448 | sk->sk_route_caps &= ~sk->sk_route_nocaps; |
9958089a | 1449 | if (sk_can_gso(sk)) { |
82cc1a7a | 1450 | if (dst->header_len) { |
9958089a | 1451 | sk->sk_route_caps &= ~NETIF_F_GSO_MASK; |
82cc1a7a | 1452 | } else { |
9958089a | 1453 | sk->sk_route_caps |= NETIF_F_SG | NETIF_F_HW_CSUM; |
82cc1a7a | 1454 | sk->sk_gso_max_size = dst->dev->gso_max_size; |
1485348d | 1455 | sk->sk_gso_max_segs = dst->dev->gso_max_segs; |
82cc1a7a | 1456 | } |
9958089a AK |
1457 | } |
1458 | } | |
1459 | EXPORT_SYMBOL_GPL(sk_setup_caps); | |
1460 | ||
1da177e4 LT |
1461 | /* |
1462 | * Simple resource managers for sockets. | |
1463 | */ | |
1464 | ||
1465 | ||
4ec93edb YH |
1466 | /* |
1467 | * Write buffer destructor automatically called from kfree_skb. | |
1da177e4 LT |
1468 | */ |
1469 | void sock_wfree(struct sk_buff *skb) | |
1470 | { | |
1471 | struct sock *sk = skb->sk; | |
d99927f4 | 1472 | unsigned int len = skb->truesize; |
1da177e4 | 1473 | |
d99927f4 ED |
1474 | if (!sock_flag(sk, SOCK_USE_WRITE_QUEUE)) { |
1475 | /* | |
1476 | * Keep a reference on sk_wmem_alloc, this will be released | |
1477 | * after sk_write_space() call | |
1478 | */ | |
1479 | atomic_sub(len - 1, &sk->sk_wmem_alloc); | |
1da177e4 | 1480 | sk->sk_write_space(sk); |
d99927f4 ED |
1481 | len = 1; |
1482 | } | |
2b85a34e | 1483 | /* |
d99927f4 ED |
1484 | * if sk_wmem_alloc reaches 0, we must finish what sk_free() |
1485 | * could not do because of in-flight packets | |
2b85a34e | 1486 | */ |
d99927f4 | 1487 | if (atomic_sub_and_test(len, &sk->sk_wmem_alloc)) |
2b85a34e | 1488 | __sk_free(sk); |
1da177e4 | 1489 | } |
2a91525c | 1490 | EXPORT_SYMBOL(sock_wfree); |
1da177e4 | 1491 | |
4ec93edb YH |
1492 | /* |
1493 | * Read buffer destructor automatically called from kfree_skb. | |
1da177e4 LT |
1494 | */ |
1495 | void sock_rfree(struct sk_buff *skb) | |
1496 | { | |
1497 | struct sock *sk = skb->sk; | |
d361fd59 | 1498 | unsigned int len = skb->truesize; |
1da177e4 | 1499 | |
d361fd59 ED |
1500 | atomic_sub(len, &sk->sk_rmem_alloc); |
1501 | sk_mem_uncharge(sk, len); | |
1da177e4 | 1502 | } |
2a91525c | 1503 | EXPORT_SYMBOL(sock_rfree); |
1da177e4 | 1504 | |
41063e9d DM |
1505 | void sock_edemux(struct sk_buff *skb) |
1506 | { | |
e812347c ED |
1507 | struct sock *sk = skb->sk; |
1508 | ||
1c463e57 | 1509 | #ifdef CONFIG_INET |
e812347c ED |
1510 | if (sk->sk_state == TCP_TIME_WAIT) |
1511 | inet_twsk_put(inet_twsk(sk)); | |
1512 | else | |
1c463e57 | 1513 | #endif |
e812347c | 1514 | sock_put(sk); |
41063e9d DM |
1515 | } |
1516 | EXPORT_SYMBOL(sock_edemux); | |
1da177e4 | 1517 | |
976d0201 | 1518 | kuid_t sock_i_uid(struct sock *sk) |
1da177e4 | 1519 | { |
976d0201 | 1520 | kuid_t uid; |
1da177e4 | 1521 | |
f064af1e | 1522 | read_lock_bh(&sk->sk_callback_lock); |
976d0201 | 1523 | uid = sk->sk_socket ? SOCK_INODE(sk->sk_socket)->i_uid : GLOBAL_ROOT_UID; |
f064af1e | 1524 | read_unlock_bh(&sk->sk_callback_lock); |
1da177e4 LT |
1525 | return uid; |
1526 | } | |
2a91525c | 1527 | EXPORT_SYMBOL(sock_i_uid); |
1da177e4 LT |
1528 | |
1529 | unsigned long sock_i_ino(struct sock *sk) | |
1530 | { | |
1531 | unsigned long ino; | |
1532 | ||
f064af1e | 1533 | read_lock_bh(&sk->sk_callback_lock); |
1da177e4 | 1534 | ino = sk->sk_socket ? SOCK_INODE(sk->sk_socket)->i_ino : 0; |
f064af1e | 1535 | read_unlock_bh(&sk->sk_callback_lock); |
1da177e4 LT |
1536 | return ino; |
1537 | } | |
2a91525c | 1538 | EXPORT_SYMBOL(sock_i_ino); |
1da177e4 LT |
1539 | |
1540 | /* | |
1541 | * Allocate a skb from the socket's send buffer. | |
1542 | */ | |
86a76caf | 1543 | struct sk_buff *sock_wmalloc(struct sock *sk, unsigned long size, int force, |
dd0fc66f | 1544 | gfp_t priority) |
1da177e4 LT |
1545 | { |
1546 | if (force || atomic_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf) { | |
2a91525c | 1547 | struct sk_buff *skb = alloc_skb(size, priority); |
1da177e4 LT |
1548 | if (skb) { |
1549 | skb_set_owner_w(skb, sk); | |
1550 | return skb; | |
1551 | } | |
1552 | } | |
1553 | return NULL; | |
1554 | } | |
2a91525c | 1555 | EXPORT_SYMBOL(sock_wmalloc); |
1da177e4 LT |
1556 | |
1557 | /* | |
1558 | * Allocate a skb from the socket's receive buffer. | |
4ec93edb | 1559 | */ |
86a76caf | 1560 | struct sk_buff *sock_rmalloc(struct sock *sk, unsigned long size, int force, |
dd0fc66f | 1561 | gfp_t priority) |
1da177e4 LT |
1562 | { |
1563 | if (force || atomic_read(&sk->sk_rmem_alloc) < sk->sk_rcvbuf) { | |
1564 | struct sk_buff *skb = alloc_skb(size, priority); | |
1565 | if (skb) { | |
1566 | skb_set_owner_r(skb, sk); | |
1567 | return skb; | |
1568 | } | |
1569 | } | |
1570 | return NULL; | |
1571 | } | |
1572 | ||
4ec93edb | 1573 | /* |
1da177e4 | 1574 | * Allocate a memory block from the socket's option memory buffer. |
4ec93edb | 1575 | */ |
dd0fc66f | 1576 | void *sock_kmalloc(struct sock *sk, int size, gfp_t priority) |
1da177e4 | 1577 | { |
95c96174 | 1578 | if ((unsigned int)size <= sysctl_optmem_max && |
1da177e4 LT |
1579 | atomic_read(&sk->sk_omem_alloc) + size < sysctl_optmem_max) { |
1580 | void *mem; | |
1581 | /* First do the add, to avoid the race if kmalloc | |
4ec93edb | 1582 | * might sleep. |
1da177e4 LT |
1583 | */ |
1584 | atomic_add(size, &sk->sk_omem_alloc); | |
1585 | mem = kmalloc(size, priority); | |
1586 | if (mem) | |
1587 | return mem; | |
1588 | atomic_sub(size, &sk->sk_omem_alloc); | |
1589 | } | |
1590 | return NULL; | |
1591 | } | |
2a91525c | 1592 | EXPORT_SYMBOL(sock_kmalloc); |
1da177e4 LT |
1593 | |
1594 | /* | |
1595 | * Free an option memory block. | |
1596 | */ | |
1597 | void sock_kfree_s(struct sock *sk, void *mem, int size) | |
1598 | { | |
1599 | kfree(mem); | |
1600 | atomic_sub(size, &sk->sk_omem_alloc); | |
1601 | } | |
2a91525c | 1602 | EXPORT_SYMBOL(sock_kfree_s); |
1da177e4 LT |
1603 | |
1604 | /* It is almost wait_for_tcp_memory minus release_sock/lock_sock. | |
1605 | I think, these locks should be removed for datagram sockets. | |
1606 | */ | |
2a91525c | 1607 | static long sock_wait_for_wmem(struct sock *sk, long timeo) |
1da177e4 LT |
1608 | { |
1609 | DEFINE_WAIT(wait); | |
1610 | ||
1611 | clear_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags); | |
1612 | for (;;) { | |
1613 | if (!timeo) | |
1614 | break; | |
1615 | if (signal_pending(current)) | |
1616 | break; | |
1617 | set_bit(SOCK_NOSPACE, &sk->sk_socket->flags); | |
aa395145 | 1618 | prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE); |
1da177e4 LT |
1619 | if (atomic_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf) |
1620 | break; | |
1621 | if (sk->sk_shutdown & SEND_SHUTDOWN) | |
1622 | break; | |
1623 | if (sk->sk_err) | |
1624 | break; | |
1625 | timeo = schedule_timeout(timeo); | |
1626 | } | |
aa395145 | 1627 | finish_wait(sk_sleep(sk), &wait); |
1da177e4 LT |
1628 | return timeo; |
1629 | } | |
1630 | ||
1631 | ||
1632 | /* | |
1633 | * Generic send/receive buffer handlers | |
1634 | */ | |
1635 | ||
4cc7f68d HX |
1636 | struct sk_buff *sock_alloc_send_pskb(struct sock *sk, unsigned long header_len, |
1637 | unsigned long data_len, int noblock, | |
1638 | int *errcode) | |
1da177e4 LT |
1639 | { |
1640 | struct sk_buff *skb; | |
7d877f3b | 1641 | gfp_t gfp_mask; |
1da177e4 LT |
1642 | long timeo; |
1643 | int err; | |
cc9b17ad JW |
1644 | int npages = (data_len + (PAGE_SIZE - 1)) >> PAGE_SHIFT; |
1645 | ||
1646 | err = -EMSGSIZE; | |
1647 | if (npages > MAX_SKB_FRAGS) | |
1648 | goto failure; | |
1da177e4 LT |
1649 | |
1650 | gfp_mask = sk->sk_allocation; | |
1651 | if (gfp_mask & __GFP_WAIT) | |
1652 | gfp_mask |= __GFP_REPEAT; | |
1653 | ||
1654 | timeo = sock_sndtimeo(sk, noblock); | |
1655 | while (1) { | |
1656 | err = sock_error(sk); | |
1657 | if (err != 0) | |
1658 | goto failure; | |
1659 | ||
1660 | err = -EPIPE; | |
1661 | if (sk->sk_shutdown & SEND_SHUTDOWN) | |
1662 | goto failure; | |
1663 | ||
1664 | if (atomic_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf) { | |
db38c179 | 1665 | skb = alloc_skb(header_len, gfp_mask); |
1da177e4 | 1666 | if (skb) { |
1da177e4 LT |
1667 | int i; |
1668 | ||
1669 | /* No pages, we're done... */ | |
1670 | if (!data_len) | |
1671 | break; | |
1672 | ||
1da177e4 LT |
1673 | skb->truesize += data_len; |
1674 | skb_shinfo(skb)->nr_frags = npages; | |
1675 | for (i = 0; i < npages; i++) { | |
1676 | struct page *page; | |
1da177e4 LT |
1677 | |
1678 | page = alloc_pages(sk->sk_allocation, 0); | |
1679 | if (!page) { | |
1680 | err = -ENOBUFS; | |
1681 | skb_shinfo(skb)->nr_frags = i; | |
1682 | kfree_skb(skb); | |
1683 | goto failure; | |
1684 | } | |
1685 | ||
ea2ab693 IC |
1686 | __skb_fill_page_desc(skb, i, |
1687 | page, 0, | |
1688 | (data_len >= PAGE_SIZE ? | |
1689 | PAGE_SIZE : | |
1690 | data_len)); | |
1da177e4 LT |
1691 | data_len -= PAGE_SIZE; |
1692 | } | |
1693 | ||
1694 | /* Full success... */ | |
1695 | break; | |
1696 | } | |
1697 | err = -ENOBUFS; | |
1698 | goto failure; | |
1699 | } | |
1700 | set_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags); | |
1701 | set_bit(SOCK_NOSPACE, &sk->sk_socket->flags); | |
1702 | err = -EAGAIN; | |
1703 | if (!timeo) | |
1704 | goto failure; | |
1705 | if (signal_pending(current)) | |
1706 | goto interrupted; | |
1707 | timeo = sock_wait_for_wmem(sk, timeo); | |
1708 | } | |
1709 | ||
1710 | skb_set_owner_w(skb, sk); | |
1711 | return skb; | |
1712 | ||
1713 | interrupted: | |
1714 | err = sock_intr_errno(timeo); | |
1715 | failure: | |
1716 | *errcode = err; | |
1717 | return NULL; | |
1718 | } | |
4cc7f68d | 1719 | EXPORT_SYMBOL(sock_alloc_send_pskb); |
1da177e4 | 1720 | |
4ec93edb | 1721 | struct sk_buff *sock_alloc_send_skb(struct sock *sk, unsigned long size, |
1da177e4 LT |
1722 | int noblock, int *errcode) |
1723 | { | |
1724 | return sock_alloc_send_pskb(sk, size, 0, noblock, errcode); | |
1725 | } | |
2a91525c | 1726 | EXPORT_SYMBOL(sock_alloc_send_skb); |
1da177e4 | 1727 | |
5640f768 ED |
1728 | /* On 32bit arches, an skb frag is limited to 2^15 */ |
1729 | #define SKB_FRAG_PAGE_ORDER get_order(32768) | |
1730 | ||
1731 | bool sk_page_frag_refill(struct sock *sk, struct page_frag *pfrag) | |
1732 | { | |
1733 | int order; | |
1734 | ||
1735 | if (pfrag->page) { | |
1736 | if (atomic_read(&pfrag->page->_count) == 1) { | |
1737 | pfrag->offset = 0; | |
1738 | return true; | |
1739 | } | |
1740 | if (pfrag->offset < pfrag->size) | |
1741 | return true; | |
1742 | put_page(pfrag->page); | |
1743 | } | |
1744 | ||
1745 | /* We restrict high order allocations to users that can afford to wait */ | |
1746 | order = (sk->sk_allocation & __GFP_WAIT) ? SKB_FRAG_PAGE_ORDER : 0; | |
1747 | ||
1748 | do { | |
1749 | gfp_t gfp = sk->sk_allocation; | |
1750 | ||
1751 | if (order) | |
1752 | gfp |= __GFP_COMP | __GFP_NOWARN; | |
1753 | pfrag->page = alloc_pages(gfp, order); | |
1754 | if (likely(pfrag->page)) { | |
1755 | pfrag->offset = 0; | |
1756 | pfrag->size = PAGE_SIZE << order; | |
1757 | return true; | |
1758 | } | |
1759 | } while (--order >= 0); | |
1760 | ||
1761 | sk_enter_memory_pressure(sk); | |
1762 | sk_stream_moderate_sndbuf(sk); | |
1763 | return false; | |
1764 | } | |
1765 | EXPORT_SYMBOL(sk_page_frag_refill); | |
1766 | ||
1da177e4 | 1767 | static void __lock_sock(struct sock *sk) |
f39234d6 NK |
1768 | __releases(&sk->sk_lock.slock) |
1769 | __acquires(&sk->sk_lock.slock) | |
1da177e4 LT |
1770 | { |
1771 | DEFINE_WAIT(wait); | |
1772 | ||
e71a4783 | 1773 | for (;;) { |
1da177e4 LT |
1774 | prepare_to_wait_exclusive(&sk->sk_lock.wq, &wait, |
1775 | TASK_UNINTERRUPTIBLE); | |
1776 | spin_unlock_bh(&sk->sk_lock.slock); | |
1777 | schedule(); | |
1778 | spin_lock_bh(&sk->sk_lock.slock); | |
e71a4783 | 1779 | if (!sock_owned_by_user(sk)) |
1da177e4 LT |
1780 | break; |
1781 | } | |
1782 | finish_wait(&sk->sk_lock.wq, &wait); | |
1783 | } | |
1784 | ||
1785 | static void __release_sock(struct sock *sk) | |
f39234d6 NK |
1786 | __releases(&sk->sk_lock.slock) |
1787 | __acquires(&sk->sk_lock.slock) | |
1da177e4 LT |
1788 | { |
1789 | struct sk_buff *skb = sk->sk_backlog.head; | |
1790 | ||
1791 | do { | |
1792 | sk->sk_backlog.head = sk->sk_backlog.tail = NULL; | |
1793 | bh_unlock_sock(sk); | |
1794 | ||
1795 | do { | |
1796 | struct sk_buff *next = skb->next; | |
1797 | ||
e4cbb02a | 1798 | prefetch(next); |
7fee226a | 1799 | WARN_ON_ONCE(skb_dst_is_noref(skb)); |
1da177e4 | 1800 | skb->next = NULL; |
c57943a1 | 1801 | sk_backlog_rcv(sk, skb); |
1da177e4 LT |
1802 | |
1803 | /* | |
1804 | * We are in process context here with softirqs | |
1805 | * disabled, use cond_resched_softirq() to preempt. | |
1806 | * This is safe to do because we've taken the backlog | |
1807 | * queue private: | |
1808 | */ | |
1809 | cond_resched_softirq(); | |
1810 | ||
1811 | skb = next; | |
1812 | } while (skb != NULL); | |
1813 | ||
1814 | bh_lock_sock(sk); | |
e71a4783 | 1815 | } while ((skb = sk->sk_backlog.head) != NULL); |
8eae939f ZY |
1816 | |
1817 | /* | |
1818 | * Doing the zeroing here guarantee we can not loop forever | |
1819 | * while a wild producer attempts to flood us. | |
1820 | */ | |
1821 | sk->sk_backlog.len = 0; | |
1da177e4 LT |
1822 | } |
1823 | ||
1824 | /** | |
1825 | * sk_wait_data - wait for data to arrive at sk_receive_queue | |
4dc3b16b PP |
1826 | * @sk: sock to wait on |
1827 | * @timeo: for how long | |
1da177e4 LT |
1828 | * |
1829 | * Now socket state including sk->sk_err is changed only under lock, | |
1830 | * hence we may omit checks after joining wait queue. | |
1831 | * We check receive queue before schedule() only as optimization; | |
1832 | * it is very likely that release_sock() added new data. | |
1833 | */ | |
1834 | int sk_wait_data(struct sock *sk, long *timeo) | |
1835 | { | |
1836 | int rc; | |
1837 | DEFINE_WAIT(wait); | |
1838 | ||
aa395145 | 1839 | prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE); |
1da177e4 LT |
1840 | set_bit(SOCK_ASYNC_WAITDATA, &sk->sk_socket->flags); |
1841 | rc = sk_wait_event(sk, timeo, !skb_queue_empty(&sk->sk_receive_queue)); | |
1842 | clear_bit(SOCK_ASYNC_WAITDATA, &sk->sk_socket->flags); | |
aa395145 | 1843 | finish_wait(sk_sleep(sk), &wait); |
1da177e4 LT |
1844 | return rc; |
1845 | } | |
1da177e4 LT |
1846 | EXPORT_SYMBOL(sk_wait_data); |
1847 | ||
3ab224be HA |
1848 | /** |
1849 | * __sk_mem_schedule - increase sk_forward_alloc and memory_allocated | |
1850 | * @sk: socket | |
1851 | * @size: memory size to allocate | |
1852 | * @kind: allocation type | |
1853 | * | |
1854 | * If kind is SK_MEM_SEND, it means wmem allocation. Otherwise it means | |
1855 | * rmem allocation. This function assumes that protocols which have | |
1856 | * memory_pressure use sk_wmem_queued as write buffer accounting. | |
1857 | */ | |
1858 | int __sk_mem_schedule(struct sock *sk, int size, int kind) | |
1859 | { | |
1860 | struct proto *prot = sk->sk_prot; | |
1861 | int amt = sk_mem_pages(size); | |
8d987e5c | 1862 | long allocated; |
e1aab161 | 1863 | int parent_status = UNDER_LIMIT; |
3ab224be HA |
1864 | |
1865 | sk->sk_forward_alloc += amt * SK_MEM_QUANTUM; | |
180d8cd9 | 1866 | |
e1aab161 | 1867 | allocated = sk_memory_allocated_add(sk, amt, &parent_status); |
3ab224be HA |
1868 | |
1869 | /* Under limit. */ | |
e1aab161 GC |
1870 | if (parent_status == UNDER_LIMIT && |
1871 | allocated <= sk_prot_mem_limits(sk, 0)) { | |
180d8cd9 | 1872 | sk_leave_memory_pressure(sk); |
3ab224be HA |
1873 | return 1; |
1874 | } | |
1875 | ||
e1aab161 GC |
1876 | /* Under pressure. (we or our parents) */ |
1877 | if ((parent_status > SOFT_LIMIT) || | |
1878 | allocated > sk_prot_mem_limits(sk, 1)) | |
180d8cd9 | 1879 | sk_enter_memory_pressure(sk); |
3ab224be | 1880 | |
e1aab161 GC |
1881 | /* Over hard limit (we or our parents) */ |
1882 | if ((parent_status == OVER_LIMIT) || | |
1883 | (allocated > sk_prot_mem_limits(sk, 2))) | |
3ab224be HA |
1884 | goto suppress_allocation; |
1885 | ||
1886 | /* guarantee minimum buffer size under pressure */ | |
1887 | if (kind == SK_MEM_RECV) { | |
1888 | if (atomic_read(&sk->sk_rmem_alloc) < prot->sysctl_rmem[0]) | |
1889 | return 1; | |
180d8cd9 | 1890 | |
3ab224be HA |
1891 | } else { /* SK_MEM_SEND */ |
1892 | if (sk->sk_type == SOCK_STREAM) { | |
1893 | if (sk->sk_wmem_queued < prot->sysctl_wmem[0]) | |
1894 | return 1; | |
1895 | } else if (atomic_read(&sk->sk_wmem_alloc) < | |
1896 | prot->sysctl_wmem[0]) | |
1897 | return 1; | |
1898 | } | |
1899 | ||
180d8cd9 | 1900 | if (sk_has_memory_pressure(sk)) { |
1748376b ED |
1901 | int alloc; |
1902 | ||
180d8cd9 | 1903 | if (!sk_under_memory_pressure(sk)) |
1748376b | 1904 | return 1; |
180d8cd9 GC |
1905 | alloc = sk_sockets_allocated_read_positive(sk); |
1906 | if (sk_prot_mem_limits(sk, 2) > alloc * | |
3ab224be HA |
1907 | sk_mem_pages(sk->sk_wmem_queued + |
1908 | atomic_read(&sk->sk_rmem_alloc) + | |
1909 | sk->sk_forward_alloc)) | |
1910 | return 1; | |
1911 | } | |
1912 | ||
1913 | suppress_allocation: | |
1914 | ||
1915 | if (kind == SK_MEM_SEND && sk->sk_type == SOCK_STREAM) { | |
1916 | sk_stream_moderate_sndbuf(sk); | |
1917 | ||
1918 | /* Fail only if socket is _under_ its sndbuf. | |
1919 | * In this case we cannot block, so that we have to fail. | |
1920 | */ | |
1921 | if (sk->sk_wmem_queued + size >= sk->sk_sndbuf) | |
1922 | return 1; | |
1923 | } | |
1924 | ||
3847ce32 SM |
1925 | trace_sock_exceed_buf_limit(sk, prot, allocated); |
1926 | ||
3ab224be HA |
1927 | /* Alas. Undo changes. */ |
1928 | sk->sk_forward_alloc -= amt * SK_MEM_QUANTUM; | |
180d8cd9 | 1929 | |
0e90b31f | 1930 | sk_memory_allocated_sub(sk, amt); |
180d8cd9 | 1931 | |
3ab224be HA |
1932 | return 0; |
1933 | } | |
3ab224be HA |
1934 | EXPORT_SYMBOL(__sk_mem_schedule); |
1935 | ||
1936 | /** | |
1937 | * __sk_reclaim - reclaim memory_allocated | |
1938 | * @sk: socket | |
1939 | */ | |
1940 | void __sk_mem_reclaim(struct sock *sk) | |
1941 | { | |
180d8cd9 | 1942 | sk_memory_allocated_sub(sk, |
0e90b31f | 1943 | sk->sk_forward_alloc >> SK_MEM_QUANTUM_SHIFT); |
3ab224be HA |
1944 | sk->sk_forward_alloc &= SK_MEM_QUANTUM - 1; |
1945 | ||
180d8cd9 GC |
1946 | if (sk_under_memory_pressure(sk) && |
1947 | (sk_memory_allocated(sk) < sk_prot_mem_limits(sk, 0))) | |
1948 | sk_leave_memory_pressure(sk); | |
3ab224be | 1949 | } |
3ab224be HA |
1950 | EXPORT_SYMBOL(__sk_mem_reclaim); |
1951 | ||
1952 | ||
1da177e4 LT |
1953 | /* |
1954 | * Set of default routines for initialising struct proto_ops when | |
1955 | * the protocol does not support a particular function. In certain | |
1956 | * cases where it makes no sense for a protocol to have a "do nothing" | |
1957 | * function, some default processing is provided. | |
1958 | */ | |
1959 | ||
1960 | int sock_no_bind(struct socket *sock, struct sockaddr *saddr, int len) | |
1961 | { | |
1962 | return -EOPNOTSUPP; | |
1963 | } | |
2a91525c | 1964 | EXPORT_SYMBOL(sock_no_bind); |
1da177e4 | 1965 | |
4ec93edb | 1966 | int sock_no_connect(struct socket *sock, struct sockaddr *saddr, |
1da177e4 LT |
1967 | int len, int flags) |
1968 | { | |
1969 | return -EOPNOTSUPP; | |
1970 | } | |
2a91525c | 1971 | EXPORT_SYMBOL(sock_no_connect); |
1da177e4 LT |
1972 | |
1973 | int sock_no_socketpair(struct socket *sock1, struct socket *sock2) | |
1974 | { | |
1975 | return -EOPNOTSUPP; | |
1976 | } | |
2a91525c | 1977 | EXPORT_SYMBOL(sock_no_socketpair); |
1da177e4 LT |
1978 | |
1979 | int sock_no_accept(struct socket *sock, struct socket *newsock, int flags) | |
1980 | { | |
1981 | return -EOPNOTSUPP; | |
1982 | } | |
2a91525c | 1983 | EXPORT_SYMBOL(sock_no_accept); |
1da177e4 | 1984 | |
4ec93edb | 1985 | int sock_no_getname(struct socket *sock, struct sockaddr *saddr, |
1da177e4 LT |
1986 | int *len, int peer) |
1987 | { | |
1988 | return -EOPNOTSUPP; | |
1989 | } | |
2a91525c | 1990 | EXPORT_SYMBOL(sock_no_getname); |
1da177e4 | 1991 | |
2a91525c | 1992 | unsigned int sock_no_poll(struct file *file, struct socket *sock, poll_table *pt) |
1da177e4 LT |
1993 | { |
1994 | return 0; | |
1995 | } | |
2a91525c | 1996 | EXPORT_SYMBOL(sock_no_poll); |
1da177e4 LT |
1997 | |
1998 | int sock_no_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg) | |
1999 | { | |
2000 | return -EOPNOTSUPP; | |
2001 | } | |
2a91525c | 2002 | EXPORT_SYMBOL(sock_no_ioctl); |
1da177e4 LT |
2003 | |
2004 | int sock_no_listen(struct socket *sock, int backlog) | |
2005 | { | |
2006 | return -EOPNOTSUPP; | |
2007 | } | |
2a91525c | 2008 | EXPORT_SYMBOL(sock_no_listen); |
1da177e4 LT |
2009 | |
2010 | int sock_no_shutdown(struct socket *sock, int how) | |
2011 | { | |
2012 | return -EOPNOTSUPP; | |
2013 | } | |
2a91525c | 2014 | EXPORT_SYMBOL(sock_no_shutdown); |
1da177e4 LT |
2015 | |
2016 | int sock_no_setsockopt(struct socket *sock, int level, int optname, | |
b7058842 | 2017 | char __user *optval, unsigned int optlen) |
1da177e4 LT |
2018 | { |
2019 | return -EOPNOTSUPP; | |
2020 | } | |
2a91525c | 2021 | EXPORT_SYMBOL(sock_no_setsockopt); |
1da177e4 LT |
2022 | |
2023 | int sock_no_getsockopt(struct socket *sock, int level, int optname, | |
2024 | char __user *optval, int __user *optlen) | |
2025 | { | |
2026 | return -EOPNOTSUPP; | |
2027 | } | |
2a91525c | 2028 | EXPORT_SYMBOL(sock_no_getsockopt); |
1da177e4 LT |
2029 | |
2030 | int sock_no_sendmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *m, | |
2031 | size_t len) | |
2032 | { | |
2033 | return -EOPNOTSUPP; | |
2034 | } | |
2a91525c | 2035 | EXPORT_SYMBOL(sock_no_sendmsg); |
1da177e4 LT |
2036 | |
2037 | int sock_no_recvmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *m, | |
2038 | size_t len, int flags) | |
2039 | { | |
2040 | return -EOPNOTSUPP; | |
2041 | } | |
2a91525c | 2042 | EXPORT_SYMBOL(sock_no_recvmsg); |
1da177e4 LT |
2043 | |
2044 | int sock_no_mmap(struct file *file, struct socket *sock, struct vm_area_struct *vma) | |
2045 | { | |
2046 | /* Mirror missing mmap method error code */ | |
2047 | return -ENODEV; | |
2048 | } | |
2a91525c | 2049 | EXPORT_SYMBOL(sock_no_mmap); |
1da177e4 LT |
2050 | |
2051 | ssize_t sock_no_sendpage(struct socket *sock, struct page *page, int offset, size_t size, int flags) | |
2052 | { | |
2053 | ssize_t res; | |
2054 | struct msghdr msg = {.msg_flags = flags}; | |
2055 | struct kvec iov; | |
2056 | char *kaddr = kmap(page); | |
2057 | iov.iov_base = kaddr + offset; | |
2058 | iov.iov_len = size; | |
2059 | res = kernel_sendmsg(sock, &msg, &iov, 1, size); | |
2060 | kunmap(page); | |
2061 | return res; | |
2062 | } | |
2a91525c | 2063 | EXPORT_SYMBOL(sock_no_sendpage); |
1da177e4 LT |
2064 | |
2065 | /* | |
2066 | * Default Socket Callbacks | |
2067 | */ | |
2068 | ||
2069 | static void sock_def_wakeup(struct sock *sk) | |
2070 | { | |
43815482 ED |
2071 | struct socket_wq *wq; |
2072 | ||
2073 | rcu_read_lock(); | |
2074 | wq = rcu_dereference(sk->sk_wq); | |
2075 | if (wq_has_sleeper(wq)) | |
2076 | wake_up_interruptible_all(&wq->wait); | |
2077 | rcu_read_unlock(); | |
1da177e4 LT |
2078 | } |
2079 | ||
2080 | static void sock_def_error_report(struct sock *sk) | |
2081 | { | |
43815482 ED |
2082 | struct socket_wq *wq; |
2083 | ||
2084 | rcu_read_lock(); | |
2085 | wq = rcu_dereference(sk->sk_wq); | |
2086 | if (wq_has_sleeper(wq)) | |
2087 | wake_up_interruptible_poll(&wq->wait, POLLERR); | |
8d8ad9d7 | 2088 | sk_wake_async(sk, SOCK_WAKE_IO, POLL_ERR); |
43815482 | 2089 | rcu_read_unlock(); |
1da177e4 LT |
2090 | } |
2091 | ||
2092 | static void sock_def_readable(struct sock *sk, int len) | |
2093 | { | |
43815482 ED |
2094 | struct socket_wq *wq; |
2095 | ||
2096 | rcu_read_lock(); | |
2097 | wq = rcu_dereference(sk->sk_wq); | |
2098 | if (wq_has_sleeper(wq)) | |
2c6607c6 | 2099 | wake_up_interruptible_sync_poll(&wq->wait, POLLIN | POLLPRI | |
37e5540b | 2100 | POLLRDNORM | POLLRDBAND); |
8d8ad9d7 | 2101 | sk_wake_async(sk, SOCK_WAKE_WAITD, POLL_IN); |
43815482 | 2102 | rcu_read_unlock(); |
1da177e4 LT |
2103 | } |
2104 | ||
2105 | static void sock_def_write_space(struct sock *sk) | |
2106 | { | |
43815482 ED |
2107 | struct socket_wq *wq; |
2108 | ||
2109 | rcu_read_lock(); | |
1da177e4 LT |
2110 | |
2111 | /* Do not wake up a writer until he can make "significant" | |
2112 | * progress. --DaveM | |
2113 | */ | |
e71a4783 | 2114 | if ((atomic_read(&sk->sk_wmem_alloc) << 1) <= sk->sk_sndbuf) { |
43815482 ED |
2115 | wq = rcu_dereference(sk->sk_wq); |
2116 | if (wq_has_sleeper(wq)) | |
2117 | wake_up_interruptible_sync_poll(&wq->wait, POLLOUT | | |
37e5540b | 2118 | POLLWRNORM | POLLWRBAND); |
1da177e4 LT |
2119 | |
2120 | /* Should agree with poll, otherwise some programs break */ | |
2121 | if (sock_writeable(sk)) | |
8d8ad9d7 | 2122 | sk_wake_async(sk, SOCK_WAKE_SPACE, POLL_OUT); |
1da177e4 LT |
2123 | } |
2124 | ||
43815482 | 2125 | rcu_read_unlock(); |
1da177e4 LT |
2126 | } |
2127 | ||
2128 | static void sock_def_destruct(struct sock *sk) | |
2129 | { | |
a51482bd | 2130 | kfree(sk->sk_protinfo); |
1da177e4 LT |
2131 | } |
2132 | ||
2133 | void sk_send_sigurg(struct sock *sk) | |
2134 | { | |
2135 | if (sk->sk_socket && sk->sk_socket->file) | |
2136 | if (send_sigurg(&sk->sk_socket->file->f_owner)) | |
8d8ad9d7 | 2137 | sk_wake_async(sk, SOCK_WAKE_URG, POLL_PRI); |
1da177e4 | 2138 | } |
2a91525c | 2139 | EXPORT_SYMBOL(sk_send_sigurg); |
1da177e4 LT |
2140 | |
2141 | void sk_reset_timer(struct sock *sk, struct timer_list* timer, | |
2142 | unsigned long expires) | |
2143 | { | |
2144 | if (!mod_timer(timer, expires)) | |
2145 | sock_hold(sk); | |
2146 | } | |
1da177e4 LT |
2147 | EXPORT_SYMBOL(sk_reset_timer); |
2148 | ||
2149 | void sk_stop_timer(struct sock *sk, struct timer_list* timer) | |
2150 | { | |
2151 | if (timer_pending(timer) && del_timer(timer)) | |
2152 | __sock_put(sk); | |
2153 | } | |
1da177e4 LT |
2154 | EXPORT_SYMBOL(sk_stop_timer); |
2155 | ||
2156 | void sock_init_data(struct socket *sock, struct sock *sk) | |
2157 | { | |
2158 | skb_queue_head_init(&sk->sk_receive_queue); | |
2159 | skb_queue_head_init(&sk->sk_write_queue); | |
2160 | skb_queue_head_init(&sk->sk_error_queue); | |
97fc2f08 CL |
2161 | #ifdef CONFIG_NET_DMA |
2162 | skb_queue_head_init(&sk->sk_async_wait_queue); | |
2163 | #endif | |
1da177e4 LT |
2164 | |
2165 | sk->sk_send_head = NULL; | |
2166 | ||
2167 | init_timer(&sk->sk_timer); | |
4ec93edb | 2168 | |
1da177e4 LT |
2169 | sk->sk_allocation = GFP_KERNEL; |
2170 | sk->sk_rcvbuf = sysctl_rmem_default; | |
2171 | sk->sk_sndbuf = sysctl_wmem_default; | |
2172 | sk->sk_state = TCP_CLOSE; | |
972692e0 | 2173 | sk_set_socket(sk, sock); |
1da177e4 LT |
2174 | |
2175 | sock_set_flag(sk, SOCK_ZAPPED); | |
2176 | ||
e71a4783 | 2177 | if (sock) { |
1da177e4 | 2178 | sk->sk_type = sock->type; |
43815482 | 2179 | sk->sk_wq = sock->wq; |
1da177e4 LT |
2180 | sock->sk = sk; |
2181 | } else | |
43815482 | 2182 | sk->sk_wq = NULL; |
1da177e4 | 2183 | |
b6c6712a | 2184 | spin_lock_init(&sk->sk_dst_lock); |
1da177e4 | 2185 | rwlock_init(&sk->sk_callback_lock); |
443aef0e PZ |
2186 | lockdep_set_class_and_name(&sk->sk_callback_lock, |
2187 | af_callback_keys + sk->sk_family, | |
2188 | af_family_clock_key_strings[sk->sk_family]); | |
1da177e4 LT |
2189 | |
2190 | sk->sk_state_change = sock_def_wakeup; | |
2191 | sk->sk_data_ready = sock_def_readable; | |
2192 | sk->sk_write_space = sock_def_write_space; | |
2193 | sk->sk_error_report = sock_def_error_report; | |
2194 | sk->sk_destruct = sock_def_destruct; | |
2195 | ||
5640f768 ED |
2196 | sk->sk_frag.page = NULL; |
2197 | sk->sk_frag.offset = 0; | |
ef64a54f | 2198 | sk->sk_peek_off = -1; |
1da177e4 | 2199 | |
109f6e39 EB |
2200 | sk->sk_peer_pid = NULL; |
2201 | sk->sk_peer_cred = NULL; | |
1da177e4 LT |
2202 | sk->sk_write_pending = 0; |
2203 | sk->sk_rcvlowat = 1; | |
2204 | sk->sk_rcvtimeo = MAX_SCHEDULE_TIMEOUT; | |
2205 | sk->sk_sndtimeo = MAX_SCHEDULE_TIMEOUT; | |
2206 | ||
f37f0afb | 2207 | sk->sk_stamp = ktime_set(-1L, 0); |
1da177e4 | 2208 | |
4dc6dc71 ED |
2209 | /* |
2210 | * Before updating sk_refcnt, we must commit prior changes to memory | |
2211 | * (Documentation/RCU/rculist_nulls.txt for details) | |
2212 | */ | |
2213 | smp_wmb(); | |
1da177e4 | 2214 | atomic_set(&sk->sk_refcnt, 1); |
33c732c3 | 2215 | atomic_set(&sk->sk_drops, 0); |
1da177e4 | 2216 | } |
2a91525c | 2217 | EXPORT_SYMBOL(sock_init_data); |
1da177e4 | 2218 | |
b5606c2d | 2219 | void lock_sock_nested(struct sock *sk, int subclass) |
1da177e4 LT |
2220 | { |
2221 | might_sleep(); | |
a5b5bb9a | 2222 | spin_lock_bh(&sk->sk_lock.slock); |
d2e9117c | 2223 | if (sk->sk_lock.owned) |
1da177e4 | 2224 | __lock_sock(sk); |
d2e9117c | 2225 | sk->sk_lock.owned = 1; |
a5b5bb9a IM |
2226 | spin_unlock(&sk->sk_lock.slock); |
2227 | /* | |
2228 | * The sk_lock has mutex_lock() semantics here: | |
2229 | */ | |
fcc70d5f | 2230 | mutex_acquire(&sk->sk_lock.dep_map, subclass, 0, _RET_IP_); |
a5b5bb9a | 2231 | local_bh_enable(); |
1da177e4 | 2232 | } |
fcc70d5f | 2233 | EXPORT_SYMBOL(lock_sock_nested); |
1da177e4 | 2234 | |
b5606c2d | 2235 | void release_sock(struct sock *sk) |
1da177e4 | 2236 | { |
a5b5bb9a IM |
2237 | /* |
2238 | * The sk_lock has mutex_unlock() semantics: | |
2239 | */ | |
2240 | mutex_release(&sk->sk_lock.dep_map, 1, _RET_IP_); | |
2241 | ||
2242 | spin_lock_bh(&sk->sk_lock.slock); | |
1da177e4 LT |
2243 | if (sk->sk_backlog.tail) |
2244 | __release_sock(sk); | |
46d3ceab ED |
2245 | |
2246 | if (sk->sk_prot->release_cb) | |
2247 | sk->sk_prot->release_cb(sk); | |
2248 | ||
d2e9117c | 2249 | sk->sk_lock.owned = 0; |
a5b5bb9a IM |
2250 | if (waitqueue_active(&sk->sk_lock.wq)) |
2251 | wake_up(&sk->sk_lock.wq); | |
2252 | spin_unlock_bh(&sk->sk_lock.slock); | |
1da177e4 LT |
2253 | } |
2254 | EXPORT_SYMBOL(release_sock); | |
2255 | ||
8a74ad60 ED |
2256 | /** |
2257 | * lock_sock_fast - fast version of lock_sock | |
2258 | * @sk: socket | |
2259 | * | |
2260 | * This version should be used for very small section, where process wont block | |
2261 | * return false if fast path is taken | |
2262 | * sk_lock.slock locked, owned = 0, BH disabled | |
2263 | * return true if slow path is taken | |
2264 | * sk_lock.slock unlocked, owned = 1, BH enabled | |
2265 | */ | |
2266 | bool lock_sock_fast(struct sock *sk) | |
2267 | { | |
2268 | might_sleep(); | |
2269 | spin_lock_bh(&sk->sk_lock.slock); | |
2270 | ||
2271 | if (!sk->sk_lock.owned) | |
2272 | /* | |
2273 | * Note : We must disable BH | |
2274 | */ | |
2275 | return false; | |
2276 | ||
2277 | __lock_sock(sk); | |
2278 | sk->sk_lock.owned = 1; | |
2279 | spin_unlock(&sk->sk_lock.slock); | |
2280 | /* | |
2281 | * The sk_lock has mutex_lock() semantics here: | |
2282 | */ | |
2283 | mutex_acquire(&sk->sk_lock.dep_map, 0, 0, _RET_IP_); | |
2284 | local_bh_enable(); | |
2285 | return true; | |
2286 | } | |
2287 | EXPORT_SYMBOL(lock_sock_fast); | |
2288 | ||
1da177e4 | 2289 | int sock_get_timestamp(struct sock *sk, struct timeval __user *userstamp) |
4ec93edb | 2290 | { |
b7aa0bf7 | 2291 | struct timeval tv; |
1da177e4 | 2292 | if (!sock_flag(sk, SOCK_TIMESTAMP)) |
20d49473 | 2293 | sock_enable_timestamp(sk, SOCK_TIMESTAMP); |
b7aa0bf7 ED |
2294 | tv = ktime_to_timeval(sk->sk_stamp); |
2295 | if (tv.tv_sec == -1) | |
1da177e4 | 2296 | return -ENOENT; |
b7aa0bf7 ED |
2297 | if (tv.tv_sec == 0) { |
2298 | sk->sk_stamp = ktime_get_real(); | |
2299 | tv = ktime_to_timeval(sk->sk_stamp); | |
2300 | } | |
2301 | return copy_to_user(userstamp, &tv, sizeof(tv)) ? -EFAULT : 0; | |
4ec93edb | 2302 | } |
1da177e4 LT |
2303 | EXPORT_SYMBOL(sock_get_timestamp); |
2304 | ||
ae40eb1e ED |
2305 | int sock_get_timestampns(struct sock *sk, struct timespec __user *userstamp) |
2306 | { | |
2307 | struct timespec ts; | |
2308 | if (!sock_flag(sk, SOCK_TIMESTAMP)) | |
20d49473 | 2309 | sock_enable_timestamp(sk, SOCK_TIMESTAMP); |
ae40eb1e ED |
2310 | ts = ktime_to_timespec(sk->sk_stamp); |
2311 | if (ts.tv_sec == -1) | |
2312 | return -ENOENT; | |
2313 | if (ts.tv_sec == 0) { | |
2314 | sk->sk_stamp = ktime_get_real(); | |
2315 | ts = ktime_to_timespec(sk->sk_stamp); | |
2316 | } | |
2317 | return copy_to_user(userstamp, &ts, sizeof(ts)) ? -EFAULT : 0; | |
2318 | } | |
2319 | EXPORT_SYMBOL(sock_get_timestampns); | |
2320 | ||
20d49473 | 2321 | void sock_enable_timestamp(struct sock *sk, int flag) |
4ec93edb | 2322 | { |
20d49473 | 2323 | if (!sock_flag(sk, flag)) { |
08e29af3 ED |
2324 | unsigned long previous_flags = sk->sk_flags; |
2325 | ||
20d49473 PO |
2326 | sock_set_flag(sk, flag); |
2327 | /* | |
2328 | * we just set one of the two flags which require net | |
2329 | * time stamping, but time stamping might have been on | |
2330 | * already because of the other one | |
2331 | */ | |
08e29af3 | 2332 | if (!(previous_flags & SK_FLAGS_TIMESTAMP)) |
20d49473 | 2333 | net_enable_timestamp(); |
1da177e4 LT |
2334 | } |
2335 | } | |
1da177e4 LT |
2336 | |
2337 | /* | |
2338 | * Get a socket option on an socket. | |
2339 | * | |
2340 | * FIX: POSIX 1003.1g is very ambiguous here. It states that | |
2341 | * asynchronous errors should be reported by getsockopt. We assume | |
2342 | * this means if you specify SO_ERROR (otherwise whats the point of it). | |
2343 | */ | |
2344 | int sock_common_getsockopt(struct socket *sock, int level, int optname, | |
2345 | char __user *optval, int __user *optlen) | |
2346 | { | |
2347 | struct sock *sk = sock->sk; | |
2348 | ||
2349 | return sk->sk_prot->getsockopt(sk, level, optname, optval, optlen); | |
2350 | } | |
1da177e4 LT |
2351 | EXPORT_SYMBOL(sock_common_getsockopt); |
2352 | ||
3fdadf7d | 2353 | #ifdef CONFIG_COMPAT |
543d9cfe ACM |
2354 | int compat_sock_common_getsockopt(struct socket *sock, int level, int optname, |
2355 | char __user *optval, int __user *optlen) | |
3fdadf7d DM |
2356 | { |
2357 | struct sock *sk = sock->sk; | |
2358 | ||
1e51f951 | 2359 | if (sk->sk_prot->compat_getsockopt != NULL) |
543d9cfe ACM |
2360 | return sk->sk_prot->compat_getsockopt(sk, level, optname, |
2361 | optval, optlen); | |
3fdadf7d DM |
2362 | return sk->sk_prot->getsockopt(sk, level, optname, optval, optlen); |
2363 | } | |
2364 | EXPORT_SYMBOL(compat_sock_common_getsockopt); | |
2365 | #endif | |
2366 | ||
1da177e4 LT |
2367 | int sock_common_recvmsg(struct kiocb *iocb, struct socket *sock, |
2368 | struct msghdr *msg, size_t size, int flags) | |
2369 | { | |
2370 | struct sock *sk = sock->sk; | |
2371 | int addr_len = 0; | |
2372 | int err; | |
2373 | ||
2374 | err = sk->sk_prot->recvmsg(iocb, sk, msg, size, flags & MSG_DONTWAIT, | |
2375 | flags & ~MSG_DONTWAIT, &addr_len); | |
2376 | if (err >= 0) | |
2377 | msg->msg_namelen = addr_len; | |
2378 | return err; | |
2379 | } | |
1da177e4 LT |
2380 | EXPORT_SYMBOL(sock_common_recvmsg); |
2381 | ||
2382 | /* | |
2383 | * Set socket options on an inet socket. | |
2384 | */ | |
2385 | int sock_common_setsockopt(struct socket *sock, int level, int optname, | |
b7058842 | 2386 | char __user *optval, unsigned int optlen) |
1da177e4 LT |
2387 | { |
2388 | struct sock *sk = sock->sk; | |
2389 | ||
2390 | return sk->sk_prot->setsockopt(sk, level, optname, optval, optlen); | |
2391 | } | |
1da177e4 LT |
2392 | EXPORT_SYMBOL(sock_common_setsockopt); |
2393 | ||
3fdadf7d | 2394 | #ifdef CONFIG_COMPAT |
543d9cfe | 2395 | int compat_sock_common_setsockopt(struct socket *sock, int level, int optname, |
b7058842 | 2396 | char __user *optval, unsigned int optlen) |
3fdadf7d DM |
2397 | { |
2398 | struct sock *sk = sock->sk; | |
2399 | ||
543d9cfe ACM |
2400 | if (sk->sk_prot->compat_setsockopt != NULL) |
2401 | return sk->sk_prot->compat_setsockopt(sk, level, optname, | |
2402 | optval, optlen); | |
3fdadf7d DM |
2403 | return sk->sk_prot->setsockopt(sk, level, optname, optval, optlen); |
2404 | } | |
2405 | EXPORT_SYMBOL(compat_sock_common_setsockopt); | |
2406 | #endif | |
2407 | ||
1da177e4 LT |
2408 | void sk_common_release(struct sock *sk) |
2409 | { | |
2410 | if (sk->sk_prot->destroy) | |
2411 | sk->sk_prot->destroy(sk); | |
2412 | ||
2413 | /* | |
2414 | * Observation: when sock_common_release is called, processes have | |
2415 | * no access to socket. But net still has. | |
2416 | * Step one, detach it from networking: | |
2417 | * | |
2418 | * A. Remove from hash tables. | |
2419 | */ | |
2420 | ||
2421 | sk->sk_prot->unhash(sk); | |
2422 | ||
2423 | /* | |
2424 | * In this point socket cannot receive new packets, but it is possible | |
2425 | * that some packets are in flight because some CPU runs receiver and | |
2426 | * did hash table lookup before we unhashed socket. They will achieve | |
2427 | * receive queue and will be purged by socket destructor. | |
2428 | * | |
2429 | * Also we still have packets pending on receive queue and probably, | |
2430 | * our own packets waiting in device queues. sock_destroy will drain | |
2431 | * receive queue, but transmitted packets will delay socket destruction | |
2432 | * until the last reference will be released. | |
2433 | */ | |
2434 | ||
2435 | sock_orphan(sk); | |
2436 | ||
2437 | xfrm_sk_free_policy(sk); | |
2438 | ||
e6848976 | 2439 | sk_refcnt_debug_release(sk); |
5640f768 ED |
2440 | |
2441 | if (sk->sk_frag.page) { | |
2442 | put_page(sk->sk_frag.page); | |
2443 | sk->sk_frag.page = NULL; | |
2444 | } | |
2445 | ||
1da177e4 LT |
2446 | sock_put(sk); |
2447 | } | |
1da177e4 LT |
2448 | EXPORT_SYMBOL(sk_common_release); |
2449 | ||
13ff3d6f PE |
2450 | #ifdef CONFIG_PROC_FS |
2451 | #define PROTO_INUSE_NR 64 /* should be enough for the first time */ | |
1338d466 PE |
2452 | struct prot_inuse { |
2453 | int val[PROTO_INUSE_NR]; | |
2454 | }; | |
13ff3d6f PE |
2455 | |
2456 | static DECLARE_BITMAP(proto_inuse_idx, PROTO_INUSE_NR); | |
70ee1159 PE |
2457 | |
2458 | #ifdef CONFIG_NET_NS | |
2459 | void sock_prot_inuse_add(struct net *net, struct proto *prot, int val) | |
2460 | { | |
d6d9ca0f | 2461 | __this_cpu_add(net->core.inuse->val[prot->inuse_idx], val); |
70ee1159 PE |
2462 | } |
2463 | EXPORT_SYMBOL_GPL(sock_prot_inuse_add); | |
2464 | ||
2465 | int sock_prot_inuse_get(struct net *net, struct proto *prot) | |
2466 | { | |
2467 | int cpu, idx = prot->inuse_idx; | |
2468 | int res = 0; | |
2469 | ||
2470 | for_each_possible_cpu(cpu) | |
2471 | res += per_cpu_ptr(net->core.inuse, cpu)->val[idx]; | |
2472 | ||
2473 | return res >= 0 ? res : 0; | |
2474 | } | |
2475 | EXPORT_SYMBOL_GPL(sock_prot_inuse_get); | |
2476 | ||
2c8c1e72 | 2477 | static int __net_init sock_inuse_init_net(struct net *net) |
70ee1159 PE |
2478 | { |
2479 | net->core.inuse = alloc_percpu(struct prot_inuse); | |
2480 | return net->core.inuse ? 0 : -ENOMEM; | |
2481 | } | |
2482 | ||
2c8c1e72 | 2483 | static void __net_exit sock_inuse_exit_net(struct net *net) |
70ee1159 PE |
2484 | { |
2485 | free_percpu(net->core.inuse); | |
2486 | } | |
2487 | ||
2488 | static struct pernet_operations net_inuse_ops = { | |
2489 | .init = sock_inuse_init_net, | |
2490 | .exit = sock_inuse_exit_net, | |
2491 | }; | |
2492 | ||
2493 | static __init int net_inuse_init(void) | |
2494 | { | |
2495 | if (register_pernet_subsys(&net_inuse_ops)) | |
2496 | panic("Cannot initialize net inuse counters"); | |
2497 | ||
2498 | return 0; | |
2499 | } | |
2500 | ||
2501 | core_initcall(net_inuse_init); | |
2502 | #else | |
1338d466 PE |
2503 | static DEFINE_PER_CPU(struct prot_inuse, prot_inuse); |
2504 | ||
c29a0bc4 | 2505 | void sock_prot_inuse_add(struct net *net, struct proto *prot, int val) |
1338d466 | 2506 | { |
d6d9ca0f | 2507 | __this_cpu_add(prot_inuse.val[prot->inuse_idx], val); |
1338d466 PE |
2508 | } |
2509 | EXPORT_SYMBOL_GPL(sock_prot_inuse_add); | |
2510 | ||
c29a0bc4 | 2511 | int sock_prot_inuse_get(struct net *net, struct proto *prot) |
1338d466 PE |
2512 | { |
2513 | int cpu, idx = prot->inuse_idx; | |
2514 | int res = 0; | |
2515 | ||
2516 | for_each_possible_cpu(cpu) | |
2517 | res += per_cpu(prot_inuse, cpu).val[idx]; | |
2518 | ||
2519 | return res >= 0 ? res : 0; | |
2520 | } | |
2521 | EXPORT_SYMBOL_GPL(sock_prot_inuse_get); | |
70ee1159 | 2522 | #endif |
13ff3d6f PE |
2523 | |
2524 | static void assign_proto_idx(struct proto *prot) | |
2525 | { | |
2526 | prot->inuse_idx = find_first_zero_bit(proto_inuse_idx, PROTO_INUSE_NR); | |
2527 | ||
2528 | if (unlikely(prot->inuse_idx == PROTO_INUSE_NR - 1)) { | |
e005d193 | 2529 | pr_err("PROTO_INUSE_NR exhausted\n"); |
13ff3d6f PE |
2530 | return; |
2531 | } | |
2532 | ||
2533 | set_bit(prot->inuse_idx, proto_inuse_idx); | |
2534 | } | |
2535 | ||
2536 | static void release_proto_idx(struct proto *prot) | |
2537 | { | |
2538 | if (prot->inuse_idx != PROTO_INUSE_NR - 1) | |
2539 | clear_bit(prot->inuse_idx, proto_inuse_idx); | |
2540 | } | |
2541 | #else | |
2542 | static inline void assign_proto_idx(struct proto *prot) | |
2543 | { | |
2544 | } | |
2545 | ||
2546 | static inline void release_proto_idx(struct proto *prot) | |
2547 | { | |
2548 | } | |
2549 | #endif | |
2550 | ||
b733c007 PE |
2551 | int proto_register(struct proto *prot, int alloc_slab) |
2552 | { | |
1da177e4 LT |
2553 | if (alloc_slab) { |
2554 | prot->slab = kmem_cache_create(prot->name, prot->obj_size, 0, | |
271b72c7 ED |
2555 | SLAB_HWCACHE_ALIGN | prot->slab_flags, |
2556 | NULL); | |
1da177e4 LT |
2557 | |
2558 | if (prot->slab == NULL) { | |
e005d193 JP |
2559 | pr_crit("%s: Can't create sock SLAB cache!\n", |
2560 | prot->name); | |
60e7663d | 2561 | goto out; |
1da177e4 | 2562 | } |
2e6599cb ACM |
2563 | |
2564 | if (prot->rsk_prot != NULL) { | |
faf23422 | 2565 | prot->rsk_prot->slab_name = kasprintf(GFP_KERNEL, "request_sock_%s", prot->name); |
7e56b5d6 | 2566 | if (prot->rsk_prot->slab_name == NULL) |
2e6599cb ACM |
2567 | goto out_free_sock_slab; |
2568 | ||
7e56b5d6 | 2569 | prot->rsk_prot->slab = kmem_cache_create(prot->rsk_prot->slab_name, |
2e6599cb | 2570 | prot->rsk_prot->obj_size, 0, |
20c2df83 | 2571 | SLAB_HWCACHE_ALIGN, NULL); |
2e6599cb ACM |
2572 | |
2573 | if (prot->rsk_prot->slab == NULL) { | |
e005d193 JP |
2574 | pr_crit("%s: Can't create request sock SLAB cache!\n", |
2575 | prot->name); | |
2e6599cb ACM |
2576 | goto out_free_request_sock_slab_name; |
2577 | } | |
2578 | } | |
8feaf0c0 | 2579 | |
6d6ee43e | 2580 | if (prot->twsk_prot != NULL) { |
faf23422 | 2581 | prot->twsk_prot->twsk_slab_name = kasprintf(GFP_KERNEL, "tw_sock_%s", prot->name); |
8feaf0c0 | 2582 | |
7e56b5d6 | 2583 | if (prot->twsk_prot->twsk_slab_name == NULL) |
8feaf0c0 ACM |
2584 | goto out_free_request_sock_slab; |
2585 | ||
6d6ee43e | 2586 | prot->twsk_prot->twsk_slab = |
7e56b5d6 | 2587 | kmem_cache_create(prot->twsk_prot->twsk_slab_name, |
6d6ee43e | 2588 | prot->twsk_prot->twsk_obj_size, |
3ab5aee7 ED |
2589 | 0, |
2590 | SLAB_HWCACHE_ALIGN | | |
2591 | prot->slab_flags, | |
20c2df83 | 2592 | NULL); |
6d6ee43e | 2593 | if (prot->twsk_prot->twsk_slab == NULL) |
8feaf0c0 ACM |
2594 | goto out_free_timewait_sock_slab_name; |
2595 | } | |
1da177e4 LT |
2596 | } |
2597 | ||
36b77a52 | 2598 | mutex_lock(&proto_list_mutex); |
1da177e4 | 2599 | list_add(&prot->node, &proto_list); |
13ff3d6f | 2600 | assign_proto_idx(prot); |
36b77a52 | 2601 | mutex_unlock(&proto_list_mutex); |
b733c007 PE |
2602 | return 0; |
2603 | ||
8feaf0c0 | 2604 | out_free_timewait_sock_slab_name: |
7e56b5d6 | 2605 | kfree(prot->twsk_prot->twsk_slab_name); |
8feaf0c0 ACM |
2606 | out_free_request_sock_slab: |
2607 | if (prot->rsk_prot && prot->rsk_prot->slab) { | |
2608 | kmem_cache_destroy(prot->rsk_prot->slab); | |
2609 | prot->rsk_prot->slab = NULL; | |
2610 | } | |
2e6599cb | 2611 | out_free_request_sock_slab_name: |
72150e9b DC |
2612 | if (prot->rsk_prot) |
2613 | kfree(prot->rsk_prot->slab_name); | |
2e6599cb ACM |
2614 | out_free_sock_slab: |
2615 | kmem_cache_destroy(prot->slab); | |
2616 | prot->slab = NULL; | |
b733c007 PE |
2617 | out: |
2618 | return -ENOBUFS; | |
1da177e4 | 2619 | } |
1da177e4 LT |
2620 | EXPORT_SYMBOL(proto_register); |
2621 | ||
2622 | void proto_unregister(struct proto *prot) | |
2623 | { | |
36b77a52 | 2624 | mutex_lock(&proto_list_mutex); |
13ff3d6f | 2625 | release_proto_idx(prot); |
0a3f4358 | 2626 | list_del(&prot->node); |
36b77a52 | 2627 | mutex_unlock(&proto_list_mutex); |
1da177e4 LT |
2628 | |
2629 | if (prot->slab != NULL) { | |
2630 | kmem_cache_destroy(prot->slab); | |
2631 | prot->slab = NULL; | |
2632 | } | |
2633 | ||
2e6599cb | 2634 | if (prot->rsk_prot != NULL && prot->rsk_prot->slab != NULL) { |
2e6599cb | 2635 | kmem_cache_destroy(prot->rsk_prot->slab); |
7e56b5d6 | 2636 | kfree(prot->rsk_prot->slab_name); |
2e6599cb ACM |
2637 | prot->rsk_prot->slab = NULL; |
2638 | } | |
2639 | ||
6d6ee43e | 2640 | if (prot->twsk_prot != NULL && prot->twsk_prot->twsk_slab != NULL) { |
6d6ee43e | 2641 | kmem_cache_destroy(prot->twsk_prot->twsk_slab); |
7e56b5d6 | 2642 | kfree(prot->twsk_prot->twsk_slab_name); |
6d6ee43e | 2643 | prot->twsk_prot->twsk_slab = NULL; |
8feaf0c0 | 2644 | } |
1da177e4 | 2645 | } |
1da177e4 LT |
2646 | EXPORT_SYMBOL(proto_unregister); |
2647 | ||
2648 | #ifdef CONFIG_PROC_FS | |
1da177e4 | 2649 | static void *proto_seq_start(struct seq_file *seq, loff_t *pos) |
36b77a52 | 2650 | __acquires(proto_list_mutex) |
1da177e4 | 2651 | { |
36b77a52 | 2652 | mutex_lock(&proto_list_mutex); |
60f0438a | 2653 | return seq_list_start_head(&proto_list, *pos); |
1da177e4 LT |
2654 | } |
2655 | ||
2656 | static void *proto_seq_next(struct seq_file *seq, void *v, loff_t *pos) | |
2657 | { | |
60f0438a | 2658 | return seq_list_next(v, &proto_list, pos); |
1da177e4 LT |
2659 | } |
2660 | ||
2661 | static void proto_seq_stop(struct seq_file *seq, void *v) | |
36b77a52 | 2662 | __releases(proto_list_mutex) |
1da177e4 | 2663 | { |
36b77a52 | 2664 | mutex_unlock(&proto_list_mutex); |
1da177e4 LT |
2665 | } |
2666 | ||
2667 | static char proto_method_implemented(const void *method) | |
2668 | { | |
2669 | return method == NULL ? 'n' : 'y'; | |
2670 | } | |
180d8cd9 GC |
2671 | static long sock_prot_memory_allocated(struct proto *proto) |
2672 | { | |
cb75a36c | 2673 | return proto->memory_allocated != NULL ? proto_memory_allocated(proto) : -1L; |
180d8cd9 GC |
2674 | } |
2675 | ||
2676 | static char *sock_prot_memory_pressure(struct proto *proto) | |
2677 | { | |
2678 | return proto->memory_pressure != NULL ? | |
2679 | proto_memory_pressure(proto) ? "yes" : "no" : "NI"; | |
2680 | } | |
1da177e4 LT |
2681 | |
2682 | static void proto_seq_printf(struct seq_file *seq, struct proto *proto) | |
2683 | { | |
180d8cd9 | 2684 | |
8d987e5c | 2685 | seq_printf(seq, "%-9s %4u %6d %6ld %-3s %6u %-3s %-10s " |
1da177e4 LT |
2686 | "%2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c\n", |
2687 | proto->name, | |
2688 | proto->obj_size, | |
14e943db | 2689 | sock_prot_inuse_get(seq_file_net(seq), proto), |
180d8cd9 GC |
2690 | sock_prot_memory_allocated(proto), |
2691 | sock_prot_memory_pressure(proto), | |
1da177e4 LT |
2692 | proto->max_header, |
2693 | proto->slab == NULL ? "no" : "yes", | |
2694 | module_name(proto->owner), | |
2695 | proto_method_implemented(proto->close), | |
2696 | proto_method_implemented(proto->connect), | |
2697 | proto_method_implemented(proto->disconnect), | |
2698 | proto_method_implemented(proto->accept), | |
2699 | proto_method_implemented(proto->ioctl), | |
2700 | proto_method_implemented(proto->init), | |
2701 | proto_method_implemented(proto->destroy), | |
2702 | proto_method_implemented(proto->shutdown), | |
2703 | proto_method_implemented(proto->setsockopt), | |
2704 | proto_method_implemented(proto->getsockopt), | |
2705 | proto_method_implemented(proto->sendmsg), | |
2706 | proto_method_implemented(proto->recvmsg), | |
2707 | proto_method_implemented(proto->sendpage), | |
2708 | proto_method_implemented(proto->bind), | |
2709 | proto_method_implemented(proto->backlog_rcv), | |
2710 | proto_method_implemented(proto->hash), | |
2711 | proto_method_implemented(proto->unhash), | |
2712 | proto_method_implemented(proto->get_port), | |
2713 | proto_method_implemented(proto->enter_memory_pressure)); | |
2714 | } | |
2715 | ||
2716 | static int proto_seq_show(struct seq_file *seq, void *v) | |
2717 | { | |
60f0438a | 2718 | if (v == &proto_list) |
1da177e4 LT |
2719 | seq_printf(seq, "%-9s %-4s %-8s %-6s %-5s %-7s %-4s %-10s %s", |
2720 | "protocol", | |
2721 | "size", | |
2722 | "sockets", | |
2723 | "memory", | |
2724 | "press", | |
2725 | "maxhdr", | |
2726 | "slab", | |
2727 | "module", | |
2728 | "cl co di ac io in de sh ss gs se re sp bi br ha uh gp em\n"); | |
2729 | else | |
60f0438a | 2730 | proto_seq_printf(seq, list_entry(v, struct proto, node)); |
1da177e4 LT |
2731 | return 0; |
2732 | } | |
2733 | ||
f690808e | 2734 | static const struct seq_operations proto_seq_ops = { |
1da177e4 LT |
2735 | .start = proto_seq_start, |
2736 | .next = proto_seq_next, | |
2737 | .stop = proto_seq_stop, | |
2738 | .show = proto_seq_show, | |
2739 | }; | |
2740 | ||
2741 | static int proto_seq_open(struct inode *inode, struct file *file) | |
2742 | { | |
14e943db ED |
2743 | return seq_open_net(inode, file, &proto_seq_ops, |
2744 | sizeof(struct seq_net_private)); | |
1da177e4 LT |
2745 | } |
2746 | ||
9a32144e | 2747 | static const struct file_operations proto_seq_fops = { |
1da177e4 LT |
2748 | .owner = THIS_MODULE, |
2749 | .open = proto_seq_open, | |
2750 | .read = seq_read, | |
2751 | .llseek = seq_lseek, | |
14e943db ED |
2752 | .release = seq_release_net, |
2753 | }; | |
2754 | ||
2755 | static __net_init int proto_init_net(struct net *net) | |
2756 | { | |
2757 | if (!proc_net_fops_create(net, "protocols", S_IRUGO, &proto_seq_fops)) | |
2758 | return -ENOMEM; | |
2759 | ||
2760 | return 0; | |
2761 | } | |
2762 | ||
2763 | static __net_exit void proto_exit_net(struct net *net) | |
2764 | { | |
2765 | proc_net_remove(net, "protocols"); | |
2766 | } | |
2767 | ||
2768 | ||
2769 | static __net_initdata struct pernet_operations proto_net_ops = { | |
2770 | .init = proto_init_net, | |
2771 | .exit = proto_exit_net, | |
1da177e4 LT |
2772 | }; |
2773 | ||
2774 | static int __init proto_init(void) | |
2775 | { | |
14e943db | 2776 | return register_pernet_subsys(&proto_net_ops); |
1da177e4 LT |
2777 | } |
2778 | ||
2779 | subsys_initcall(proto_init); | |
2780 | ||
2781 | #endif /* PROC_FS */ |