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 | ||
4fc268d2 | 92 | #include <linux/capability.h> |
1da177e4 LT |
93 | #include <linux/errno.h> |
94 | #include <linux/types.h> | |
95 | #include <linux/socket.h> | |
96 | #include <linux/in.h> | |
97 | #include <linux/kernel.h> | |
1da177e4 LT |
98 | #include <linux/module.h> |
99 | #include <linux/proc_fs.h> | |
100 | #include <linux/seq_file.h> | |
101 | #include <linux/sched.h> | |
102 | #include <linux/timer.h> | |
103 | #include <linux/string.h> | |
104 | #include <linux/sockios.h> | |
105 | #include <linux/net.h> | |
106 | #include <linux/mm.h> | |
107 | #include <linux/slab.h> | |
108 | #include <linux/interrupt.h> | |
109 | #include <linux/poll.h> | |
110 | #include <linux/tcp.h> | |
111 | #include <linux/init.h> | |
a1f8e7f7 | 112 | #include <linux/highmem.h> |
3f551f94 | 113 | #include <linux/user_namespace.h> |
e1aab161 | 114 | #include <linux/jump_label.h> |
1da177e4 LT |
115 | |
116 | #include <asm/uaccess.h> | |
117 | #include <asm/system.h> | |
118 | ||
119 | #include <linux/netdevice.h> | |
120 | #include <net/protocol.h> | |
121 | #include <linux/skbuff.h> | |
457c4cbc | 122 | #include <net/net_namespace.h> |
2e6599cb | 123 | #include <net/request_sock.h> |
1da177e4 | 124 | #include <net/sock.h> |
20d49473 | 125 | #include <linux/net_tstamp.h> |
1da177e4 LT |
126 | #include <net/xfrm.h> |
127 | #include <linux/ipsec.h> | |
f8451725 | 128 | #include <net/cls_cgroup.h> |
5bc1421e | 129 | #include <net/netprio_cgroup.h> |
1da177e4 LT |
130 | |
131 | #include <linux/filter.h> | |
132 | ||
3847ce32 SM |
133 | #include <trace/events/sock.h> |
134 | ||
1da177e4 LT |
135 | #ifdef CONFIG_INET |
136 | #include <net/tcp.h> | |
137 | #endif | |
138 | ||
d1a4c0b3 GC |
139 | static DEFINE_RWLOCK(proto_list_lock); |
140 | static LIST_HEAD(proto_list); | |
141 | ||
142 | #ifdef CONFIG_CGROUP_MEM_RES_CTLR_KMEM | |
143 | int mem_cgroup_sockets_init(struct cgroup *cgrp, struct cgroup_subsys *ss) | |
144 | { | |
145 | struct proto *proto; | |
146 | int ret = 0; | |
147 | ||
148 | read_lock(&proto_list_lock); | |
149 | list_for_each_entry(proto, &proto_list, node) { | |
150 | if (proto->init_cgroup) { | |
151 | ret = proto->init_cgroup(cgrp, ss); | |
152 | if (ret) | |
153 | goto out; | |
154 | } | |
155 | } | |
156 | ||
157 | read_unlock(&proto_list_lock); | |
158 | return ret; | |
159 | out: | |
160 | list_for_each_entry_continue_reverse(proto, &proto_list, node) | |
161 | if (proto->destroy_cgroup) | |
162 | proto->destroy_cgroup(cgrp, ss); | |
163 | read_unlock(&proto_list_lock); | |
164 | return ret; | |
165 | } | |
166 | ||
167 | void mem_cgroup_sockets_destroy(struct cgroup *cgrp, struct cgroup_subsys *ss) | |
168 | { | |
169 | struct proto *proto; | |
170 | ||
171 | read_lock(&proto_list_lock); | |
172 | list_for_each_entry_reverse(proto, &proto_list, node) | |
173 | if (proto->destroy_cgroup) | |
174 | proto->destroy_cgroup(cgrp, ss); | |
175 | read_unlock(&proto_list_lock); | |
176 | } | |
177 | #endif | |
178 | ||
da21f24d IM |
179 | /* |
180 | * Each address family might have different locking rules, so we have | |
181 | * one slock key per address family: | |
182 | */ | |
a5b5bb9a IM |
183 | static struct lock_class_key af_family_keys[AF_MAX]; |
184 | static struct lock_class_key af_family_slock_keys[AF_MAX]; | |
185 | ||
e1aab161 GC |
186 | struct jump_label_key memcg_socket_limit_enabled; |
187 | EXPORT_SYMBOL(memcg_socket_limit_enabled); | |
188 | ||
a5b5bb9a IM |
189 | /* |
190 | * Make lock validator output more readable. (we pre-construct these | |
191 | * strings build-time, so that runtime initialization of socket | |
192 | * locks is fast): | |
193 | */ | |
36cbd3dc | 194 | static const char *const af_family_key_strings[AF_MAX+1] = { |
a5b5bb9a IM |
195 | "sk_lock-AF_UNSPEC", "sk_lock-AF_UNIX" , "sk_lock-AF_INET" , |
196 | "sk_lock-AF_AX25" , "sk_lock-AF_IPX" , "sk_lock-AF_APPLETALK", | |
197 | "sk_lock-AF_NETROM", "sk_lock-AF_BRIDGE" , "sk_lock-AF_ATMPVC" , | |
198 | "sk_lock-AF_X25" , "sk_lock-AF_INET6" , "sk_lock-AF_ROSE" , | |
199 | "sk_lock-AF_DECnet", "sk_lock-AF_NETBEUI" , "sk_lock-AF_SECURITY" , | |
200 | "sk_lock-AF_KEY" , "sk_lock-AF_NETLINK" , "sk_lock-AF_PACKET" , | |
201 | "sk_lock-AF_ASH" , "sk_lock-AF_ECONET" , "sk_lock-AF_ATMSVC" , | |
cbd151bf | 202 | "sk_lock-AF_RDS" , "sk_lock-AF_SNA" , "sk_lock-AF_IRDA" , |
a5b5bb9a | 203 | "sk_lock-AF_PPPOX" , "sk_lock-AF_WANPIPE" , "sk_lock-AF_LLC" , |
cd05acfe | 204 | "sk_lock-27" , "sk_lock-28" , "sk_lock-AF_CAN" , |
17926a79 | 205 | "sk_lock-AF_TIPC" , "sk_lock-AF_BLUETOOTH", "sk_lock-IUCV" , |
bce7b154 | 206 | "sk_lock-AF_RXRPC" , "sk_lock-AF_ISDN" , "sk_lock-AF_PHONET" , |
6f107b58 | 207 | "sk_lock-AF_IEEE802154", "sk_lock-AF_CAIF" , "sk_lock-AF_ALG" , |
c7fe3b52 | 208 | "sk_lock-AF_NFC" , "sk_lock-AF_MAX" |
a5b5bb9a | 209 | }; |
36cbd3dc | 210 | static const char *const af_family_slock_key_strings[AF_MAX+1] = { |
a5b5bb9a IM |
211 | "slock-AF_UNSPEC", "slock-AF_UNIX" , "slock-AF_INET" , |
212 | "slock-AF_AX25" , "slock-AF_IPX" , "slock-AF_APPLETALK", | |
213 | "slock-AF_NETROM", "slock-AF_BRIDGE" , "slock-AF_ATMPVC" , | |
214 | "slock-AF_X25" , "slock-AF_INET6" , "slock-AF_ROSE" , | |
215 | "slock-AF_DECnet", "slock-AF_NETBEUI" , "slock-AF_SECURITY" , | |
216 | "slock-AF_KEY" , "slock-AF_NETLINK" , "slock-AF_PACKET" , | |
217 | "slock-AF_ASH" , "slock-AF_ECONET" , "slock-AF_ATMSVC" , | |
cbd151bf | 218 | "slock-AF_RDS" , "slock-AF_SNA" , "slock-AF_IRDA" , |
a5b5bb9a | 219 | "slock-AF_PPPOX" , "slock-AF_WANPIPE" , "slock-AF_LLC" , |
cd05acfe | 220 | "slock-27" , "slock-28" , "slock-AF_CAN" , |
17926a79 | 221 | "slock-AF_TIPC" , "slock-AF_BLUETOOTH", "slock-AF_IUCV" , |
bce7b154 | 222 | "slock-AF_RXRPC" , "slock-AF_ISDN" , "slock-AF_PHONET" , |
6f107b58 | 223 | "slock-AF_IEEE802154", "slock-AF_CAIF" , "slock-AF_ALG" , |
c7fe3b52 | 224 | "slock-AF_NFC" , "slock-AF_MAX" |
a5b5bb9a | 225 | }; |
36cbd3dc | 226 | static const char *const af_family_clock_key_strings[AF_MAX+1] = { |
443aef0e PZ |
227 | "clock-AF_UNSPEC", "clock-AF_UNIX" , "clock-AF_INET" , |
228 | "clock-AF_AX25" , "clock-AF_IPX" , "clock-AF_APPLETALK", | |
229 | "clock-AF_NETROM", "clock-AF_BRIDGE" , "clock-AF_ATMPVC" , | |
230 | "clock-AF_X25" , "clock-AF_INET6" , "clock-AF_ROSE" , | |
231 | "clock-AF_DECnet", "clock-AF_NETBEUI" , "clock-AF_SECURITY" , | |
232 | "clock-AF_KEY" , "clock-AF_NETLINK" , "clock-AF_PACKET" , | |
233 | "clock-AF_ASH" , "clock-AF_ECONET" , "clock-AF_ATMSVC" , | |
cbd151bf | 234 | "clock-AF_RDS" , "clock-AF_SNA" , "clock-AF_IRDA" , |
443aef0e | 235 | "clock-AF_PPPOX" , "clock-AF_WANPIPE" , "clock-AF_LLC" , |
b4942af6 | 236 | "clock-27" , "clock-28" , "clock-AF_CAN" , |
e51f802b | 237 | "clock-AF_TIPC" , "clock-AF_BLUETOOTH", "clock-AF_IUCV" , |
bce7b154 | 238 | "clock-AF_RXRPC" , "clock-AF_ISDN" , "clock-AF_PHONET" , |
6f107b58 | 239 | "clock-AF_IEEE802154", "clock-AF_CAIF" , "clock-AF_ALG" , |
c7fe3b52 | 240 | "clock-AF_NFC" , "clock-AF_MAX" |
443aef0e | 241 | }; |
da21f24d IM |
242 | |
243 | /* | |
244 | * sk_callback_lock locking rules are per-address-family, | |
245 | * so split the lock classes by using a per-AF key: | |
246 | */ | |
247 | static struct lock_class_key af_callback_keys[AF_MAX]; | |
248 | ||
1da177e4 LT |
249 | /* Take into consideration the size of the struct sk_buff overhead in the |
250 | * determination of these values, since that is non-constant across | |
251 | * platforms. This makes socket queueing behavior and performance | |
252 | * not depend upon such differences. | |
253 | */ | |
254 | #define _SK_MEM_PACKETS 256 | |
87fb4b7b | 255 | #define _SK_MEM_OVERHEAD SKB_TRUESIZE(256) |
1da177e4 LT |
256 | #define SK_WMEM_MAX (_SK_MEM_OVERHEAD * _SK_MEM_PACKETS) |
257 | #define SK_RMEM_MAX (_SK_MEM_OVERHEAD * _SK_MEM_PACKETS) | |
258 | ||
259 | /* Run time adjustable parameters. */ | |
ab32ea5d BH |
260 | __u32 sysctl_wmem_max __read_mostly = SK_WMEM_MAX; |
261 | __u32 sysctl_rmem_max __read_mostly = SK_RMEM_MAX; | |
262 | __u32 sysctl_wmem_default __read_mostly = SK_WMEM_MAX; | |
263 | __u32 sysctl_rmem_default __read_mostly = SK_RMEM_MAX; | |
1da177e4 | 264 | |
25985edc | 265 | /* Maximal space eaten by iovec or ancillary data plus some space */ |
ab32ea5d | 266 | int sysctl_optmem_max __read_mostly = sizeof(unsigned long)*(2*UIO_MAXIOV+512); |
2a91525c | 267 | EXPORT_SYMBOL(sysctl_optmem_max); |
1da177e4 | 268 | |
5bc1421e NH |
269 | #if defined(CONFIG_CGROUPS) |
270 | #if !defined(CONFIG_NET_CLS_CGROUP) | |
f8451725 HX |
271 | int net_cls_subsys_id = -1; |
272 | EXPORT_SYMBOL_GPL(net_cls_subsys_id); | |
273 | #endif | |
5bc1421e NH |
274 | #if !defined(CONFIG_NETPRIO_CGROUP) |
275 | int net_prio_subsys_id = -1; | |
276 | EXPORT_SYMBOL_GPL(net_prio_subsys_id); | |
277 | #endif | |
278 | #endif | |
f8451725 | 279 | |
1da177e4 LT |
280 | static int sock_set_timeout(long *timeo_p, char __user *optval, int optlen) |
281 | { | |
282 | struct timeval tv; | |
283 | ||
284 | if (optlen < sizeof(tv)) | |
285 | return -EINVAL; | |
286 | if (copy_from_user(&tv, optval, sizeof(tv))) | |
287 | return -EFAULT; | |
ba78073e VA |
288 | if (tv.tv_usec < 0 || tv.tv_usec >= USEC_PER_SEC) |
289 | return -EDOM; | |
1da177e4 | 290 | |
ba78073e | 291 | if (tv.tv_sec < 0) { |
6f11df83 AM |
292 | static int warned __read_mostly; |
293 | ||
ba78073e | 294 | *timeo_p = 0; |
50aab54f | 295 | if (warned < 10 && net_ratelimit()) { |
ba78073e VA |
296 | warned++; |
297 | printk(KERN_INFO "sock_set_timeout: `%s' (pid %d) " | |
298 | "tries to set negative timeout\n", | |
ba25f9dc | 299 | current->comm, task_pid_nr(current)); |
50aab54f | 300 | } |
ba78073e VA |
301 | return 0; |
302 | } | |
1da177e4 LT |
303 | *timeo_p = MAX_SCHEDULE_TIMEOUT; |
304 | if (tv.tv_sec == 0 && tv.tv_usec == 0) | |
305 | return 0; | |
306 | if (tv.tv_sec < (MAX_SCHEDULE_TIMEOUT/HZ - 1)) | |
307 | *timeo_p = tv.tv_sec*HZ + (tv.tv_usec+(1000000/HZ-1))/(1000000/HZ); | |
308 | return 0; | |
309 | } | |
310 | ||
311 | static void sock_warn_obsolete_bsdism(const char *name) | |
312 | { | |
313 | static int warned; | |
314 | static char warncomm[TASK_COMM_LEN]; | |
4ec93edb YH |
315 | if (strcmp(warncomm, current->comm) && warned < 5) { |
316 | strcpy(warncomm, current->comm); | |
1da177e4 LT |
317 | printk(KERN_WARNING "process `%s' is using obsolete " |
318 | "%s SO_BSDCOMPAT\n", warncomm, name); | |
319 | warned++; | |
320 | } | |
321 | } | |
322 | ||
08e29af3 ED |
323 | #define SK_FLAGS_TIMESTAMP ((1UL << SOCK_TIMESTAMP) | (1UL << SOCK_TIMESTAMPING_RX_SOFTWARE)) |
324 | ||
325 | static void sock_disable_timestamp(struct sock *sk, unsigned long flags) | |
4ec93edb | 326 | { |
08e29af3 ED |
327 | if (sk->sk_flags & flags) { |
328 | sk->sk_flags &= ~flags; | |
329 | if (!(sk->sk_flags & SK_FLAGS_TIMESTAMP)) | |
20d49473 | 330 | net_disable_timestamp(); |
1da177e4 LT |
331 | } |
332 | } | |
333 | ||
334 | ||
f0088a50 DV |
335 | int sock_queue_rcv_skb(struct sock *sk, struct sk_buff *skb) |
336 | { | |
766e9037 | 337 | int err; |
f0088a50 | 338 | int skb_len; |
3b885787 NH |
339 | unsigned long flags; |
340 | struct sk_buff_head *list = &sk->sk_receive_queue; | |
f0088a50 | 341 | |
9ee6b7f1 | 342 | /* Cast sk->rcvbuf to unsigned... It's pointless, but reduces |
f0088a50 DV |
343 | number of warnings when compiling with -W --ANK |
344 | */ | |
345 | if (atomic_read(&sk->sk_rmem_alloc) + skb->truesize >= | |
346 | (unsigned)sk->sk_rcvbuf) { | |
766e9037 | 347 | atomic_inc(&sk->sk_drops); |
3847ce32 | 348 | trace_sock_rcvqueue_full(sk, skb); |
766e9037 | 349 | return -ENOMEM; |
f0088a50 DV |
350 | } |
351 | ||
fda9ef5d | 352 | err = sk_filter(sk, skb); |
f0088a50 | 353 | if (err) |
766e9037 | 354 | return err; |
f0088a50 | 355 | |
3ab224be | 356 | if (!sk_rmem_schedule(sk, skb->truesize)) { |
766e9037 ED |
357 | atomic_inc(&sk->sk_drops); |
358 | return -ENOBUFS; | |
3ab224be HA |
359 | } |
360 | ||
f0088a50 DV |
361 | skb->dev = NULL; |
362 | skb_set_owner_r(skb, sk); | |
49ad9599 | 363 | |
f0088a50 DV |
364 | /* Cache the SKB length before we tack it onto the receive |
365 | * queue. Once it is added it no longer belongs to us and | |
366 | * may be freed by other threads of control pulling packets | |
367 | * from the queue. | |
368 | */ | |
369 | skb_len = skb->len; | |
370 | ||
7fee226a ED |
371 | /* we escape from rcu protected region, make sure we dont leak |
372 | * a norefcounted dst | |
373 | */ | |
374 | skb_dst_force(skb); | |
375 | ||
3b885787 NH |
376 | spin_lock_irqsave(&list->lock, flags); |
377 | skb->dropcount = atomic_read(&sk->sk_drops); | |
378 | __skb_queue_tail(list, skb); | |
379 | spin_unlock_irqrestore(&list->lock, flags); | |
f0088a50 DV |
380 | |
381 | if (!sock_flag(sk, SOCK_DEAD)) | |
382 | sk->sk_data_ready(sk, skb_len); | |
766e9037 | 383 | return 0; |
f0088a50 DV |
384 | } |
385 | EXPORT_SYMBOL(sock_queue_rcv_skb); | |
386 | ||
58a5a7b9 | 387 | int sk_receive_skb(struct sock *sk, struct sk_buff *skb, const int nested) |
f0088a50 DV |
388 | { |
389 | int rc = NET_RX_SUCCESS; | |
390 | ||
fda9ef5d | 391 | if (sk_filter(sk, skb)) |
f0088a50 DV |
392 | goto discard_and_relse; |
393 | ||
394 | skb->dev = NULL; | |
395 | ||
c377411f ED |
396 | if (sk_rcvqueues_full(sk, skb)) { |
397 | atomic_inc(&sk->sk_drops); | |
398 | goto discard_and_relse; | |
399 | } | |
58a5a7b9 ACM |
400 | if (nested) |
401 | bh_lock_sock_nested(sk); | |
402 | else | |
403 | bh_lock_sock(sk); | |
a5b5bb9a IM |
404 | if (!sock_owned_by_user(sk)) { |
405 | /* | |
406 | * trylock + unlock semantics: | |
407 | */ | |
408 | mutex_acquire(&sk->sk_lock.dep_map, 0, 1, _RET_IP_); | |
409 | ||
c57943a1 | 410 | rc = sk_backlog_rcv(sk, skb); |
a5b5bb9a IM |
411 | |
412 | mutex_release(&sk->sk_lock.dep_map, 1, _RET_IP_); | |
a3a858ff | 413 | } else if (sk_add_backlog(sk, skb)) { |
8eae939f ZY |
414 | bh_unlock_sock(sk); |
415 | atomic_inc(&sk->sk_drops); | |
416 | goto discard_and_relse; | |
417 | } | |
418 | ||
f0088a50 DV |
419 | bh_unlock_sock(sk); |
420 | out: | |
421 | sock_put(sk); | |
422 | return rc; | |
423 | discard_and_relse: | |
424 | kfree_skb(skb); | |
425 | goto out; | |
426 | } | |
427 | EXPORT_SYMBOL(sk_receive_skb); | |
428 | ||
ea94ff3b KK |
429 | void sk_reset_txq(struct sock *sk) |
430 | { | |
431 | sk_tx_queue_clear(sk); | |
432 | } | |
433 | EXPORT_SYMBOL(sk_reset_txq); | |
434 | ||
f0088a50 DV |
435 | struct dst_entry *__sk_dst_check(struct sock *sk, u32 cookie) |
436 | { | |
b6c6712a | 437 | struct dst_entry *dst = __sk_dst_get(sk); |
f0088a50 DV |
438 | |
439 | if (dst && dst->obsolete && dst->ops->check(dst, cookie) == NULL) { | |
e022f0b4 | 440 | sk_tx_queue_clear(sk); |
a9b3cd7f | 441 | RCU_INIT_POINTER(sk->sk_dst_cache, NULL); |
f0088a50 DV |
442 | dst_release(dst); |
443 | return NULL; | |
444 | } | |
445 | ||
446 | return dst; | |
447 | } | |
448 | EXPORT_SYMBOL(__sk_dst_check); | |
449 | ||
450 | struct dst_entry *sk_dst_check(struct sock *sk, u32 cookie) | |
451 | { | |
452 | struct dst_entry *dst = sk_dst_get(sk); | |
453 | ||
454 | if (dst && dst->obsolete && dst->ops->check(dst, cookie) == NULL) { | |
455 | sk_dst_reset(sk); | |
456 | dst_release(dst); | |
457 | return NULL; | |
458 | } | |
459 | ||
460 | return dst; | |
461 | } | |
462 | EXPORT_SYMBOL(sk_dst_check); | |
463 | ||
4878809f DM |
464 | static int sock_bindtodevice(struct sock *sk, char __user *optval, int optlen) |
465 | { | |
466 | int ret = -ENOPROTOOPT; | |
467 | #ifdef CONFIG_NETDEVICES | |
3b1e0a65 | 468 | struct net *net = sock_net(sk); |
4878809f DM |
469 | char devname[IFNAMSIZ]; |
470 | int index; | |
471 | ||
472 | /* Sorry... */ | |
473 | ret = -EPERM; | |
474 | if (!capable(CAP_NET_RAW)) | |
475 | goto out; | |
476 | ||
477 | ret = -EINVAL; | |
478 | if (optlen < 0) | |
479 | goto out; | |
480 | ||
481 | /* Bind this socket to a particular device like "eth0", | |
482 | * as specified in the passed interface name. If the | |
483 | * name is "" or the option length is zero the socket | |
484 | * is not bound. | |
485 | */ | |
486 | if (optlen > IFNAMSIZ - 1) | |
487 | optlen = IFNAMSIZ - 1; | |
488 | memset(devname, 0, sizeof(devname)); | |
489 | ||
490 | ret = -EFAULT; | |
491 | if (copy_from_user(devname, optval, optlen)) | |
492 | goto out; | |
493 | ||
000ba2e4 DM |
494 | index = 0; |
495 | if (devname[0] != '\0') { | |
bf8e56bf | 496 | struct net_device *dev; |
4878809f | 497 | |
bf8e56bf ED |
498 | rcu_read_lock(); |
499 | dev = dev_get_by_name_rcu(net, devname); | |
500 | if (dev) | |
501 | index = dev->ifindex; | |
502 | rcu_read_unlock(); | |
4878809f DM |
503 | ret = -ENODEV; |
504 | if (!dev) | |
505 | goto out; | |
4878809f DM |
506 | } |
507 | ||
508 | lock_sock(sk); | |
509 | sk->sk_bound_dev_if = index; | |
510 | sk_dst_reset(sk); | |
511 | release_sock(sk); | |
512 | ||
513 | ret = 0; | |
514 | ||
515 | out: | |
516 | #endif | |
517 | ||
518 | return ret; | |
519 | } | |
520 | ||
c0ef877b PE |
521 | static inline void sock_valbool_flag(struct sock *sk, int bit, int valbool) |
522 | { | |
523 | if (valbool) | |
524 | sock_set_flag(sk, bit); | |
525 | else | |
526 | sock_reset_flag(sk, bit); | |
527 | } | |
528 | ||
1da177e4 LT |
529 | /* |
530 | * This is meant for all protocols to use and covers goings on | |
531 | * at the socket level. Everything here is generic. | |
532 | */ | |
533 | ||
534 | int sock_setsockopt(struct socket *sock, int level, int optname, | |
b7058842 | 535 | char __user *optval, unsigned int optlen) |
1da177e4 | 536 | { |
2a91525c | 537 | struct sock *sk = sock->sk; |
1da177e4 LT |
538 | int val; |
539 | int valbool; | |
540 | struct linger ling; | |
541 | int ret = 0; | |
4ec93edb | 542 | |
1da177e4 LT |
543 | /* |
544 | * Options without arguments | |
545 | */ | |
546 | ||
4878809f DM |
547 | if (optname == SO_BINDTODEVICE) |
548 | return sock_bindtodevice(sk, optval, optlen); | |
549 | ||
e71a4783 SH |
550 | if (optlen < sizeof(int)) |
551 | return -EINVAL; | |
4ec93edb | 552 | |
1da177e4 LT |
553 | if (get_user(val, (int __user *)optval)) |
554 | return -EFAULT; | |
4ec93edb | 555 | |
2a91525c | 556 | valbool = val ? 1 : 0; |
1da177e4 LT |
557 | |
558 | lock_sock(sk); | |
559 | ||
2a91525c | 560 | switch (optname) { |
e71a4783 | 561 | case SO_DEBUG: |
2a91525c | 562 | if (val && !capable(CAP_NET_ADMIN)) |
e71a4783 | 563 | ret = -EACCES; |
2a91525c | 564 | else |
c0ef877b | 565 | sock_valbool_flag(sk, SOCK_DBG, valbool); |
e71a4783 SH |
566 | break; |
567 | case SO_REUSEADDR: | |
568 | sk->sk_reuse = valbool; | |
569 | break; | |
570 | case SO_TYPE: | |
49c794e9 | 571 | case SO_PROTOCOL: |
0d6038ee | 572 | case SO_DOMAIN: |
e71a4783 SH |
573 | case SO_ERROR: |
574 | ret = -ENOPROTOOPT; | |
575 | break; | |
576 | case SO_DONTROUTE: | |
c0ef877b | 577 | sock_valbool_flag(sk, SOCK_LOCALROUTE, valbool); |
e71a4783 SH |
578 | break; |
579 | case SO_BROADCAST: | |
580 | sock_valbool_flag(sk, SOCK_BROADCAST, valbool); | |
581 | break; | |
582 | case SO_SNDBUF: | |
583 | /* Don't error on this BSD doesn't and if you think | |
584 | about it this is right. Otherwise apps have to | |
585 | play 'guess the biggest size' games. RCVBUF/SNDBUF | |
586 | are treated in BSD as hints */ | |
587 | ||
588 | if (val > sysctl_wmem_max) | |
589 | val = sysctl_wmem_max; | |
b0573dea | 590 | set_sndbuf: |
e71a4783 SH |
591 | sk->sk_userlocks |= SOCK_SNDBUF_LOCK; |
592 | if ((val * 2) < SOCK_MIN_SNDBUF) | |
593 | sk->sk_sndbuf = SOCK_MIN_SNDBUF; | |
594 | else | |
595 | sk->sk_sndbuf = val * 2; | |
1da177e4 | 596 | |
e71a4783 SH |
597 | /* |
598 | * Wake up sending tasks if we | |
599 | * upped the value. | |
600 | */ | |
601 | sk->sk_write_space(sk); | |
602 | break; | |
1da177e4 | 603 | |
e71a4783 SH |
604 | case SO_SNDBUFFORCE: |
605 | if (!capable(CAP_NET_ADMIN)) { | |
606 | ret = -EPERM; | |
607 | break; | |
608 | } | |
609 | goto set_sndbuf; | |
b0573dea | 610 | |
e71a4783 SH |
611 | case SO_RCVBUF: |
612 | /* Don't error on this BSD doesn't and if you think | |
613 | about it this is right. Otherwise apps have to | |
614 | play 'guess the biggest size' games. RCVBUF/SNDBUF | |
615 | are treated in BSD as hints */ | |
4ec93edb | 616 | |
e71a4783 SH |
617 | if (val > sysctl_rmem_max) |
618 | val = sysctl_rmem_max; | |
b0573dea | 619 | set_rcvbuf: |
e71a4783 SH |
620 | sk->sk_userlocks |= SOCK_RCVBUF_LOCK; |
621 | /* | |
622 | * We double it on the way in to account for | |
623 | * "struct sk_buff" etc. overhead. Applications | |
624 | * assume that the SO_RCVBUF setting they make will | |
625 | * allow that much actual data to be received on that | |
626 | * socket. | |
627 | * | |
628 | * Applications are unaware that "struct sk_buff" and | |
629 | * other overheads allocate from the receive buffer | |
630 | * during socket buffer allocation. | |
631 | * | |
632 | * And after considering the possible alternatives, | |
633 | * returning the value we actually used in getsockopt | |
634 | * is the most desirable behavior. | |
635 | */ | |
636 | if ((val * 2) < SOCK_MIN_RCVBUF) | |
637 | sk->sk_rcvbuf = SOCK_MIN_RCVBUF; | |
638 | else | |
639 | sk->sk_rcvbuf = val * 2; | |
640 | break; | |
641 | ||
642 | case SO_RCVBUFFORCE: | |
643 | if (!capable(CAP_NET_ADMIN)) { | |
644 | ret = -EPERM; | |
1da177e4 | 645 | break; |
e71a4783 SH |
646 | } |
647 | goto set_rcvbuf; | |
1da177e4 | 648 | |
e71a4783 | 649 | case SO_KEEPALIVE: |
1da177e4 | 650 | #ifdef CONFIG_INET |
e71a4783 SH |
651 | if (sk->sk_protocol == IPPROTO_TCP) |
652 | tcp_set_keepalive(sk, valbool); | |
1da177e4 | 653 | #endif |
e71a4783 SH |
654 | sock_valbool_flag(sk, SOCK_KEEPOPEN, valbool); |
655 | break; | |
656 | ||
657 | case SO_OOBINLINE: | |
658 | sock_valbool_flag(sk, SOCK_URGINLINE, valbool); | |
659 | break; | |
660 | ||
661 | case SO_NO_CHECK: | |
662 | sk->sk_no_check = valbool; | |
663 | break; | |
664 | ||
665 | case SO_PRIORITY: | |
666 | if ((val >= 0 && val <= 6) || capable(CAP_NET_ADMIN)) | |
667 | sk->sk_priority = val; | |
668 | else | |
669 | ret = -EPERM; | |
670 | break; | |
671 | ||
672 | case SO_LINGER: | |
673 | if (optlen < sizeof(ling)) { | |
674 | ret = -EINVAL; /* 1003.1g */ | |
1da177e4 | 675 | break; |
e71a4783 | 676 | } |
2a91525c | 677 | if (copy_from_user(&ling, optval, sizeof(ling))) { |
e71a4783 | 678 | ret = -EFAULT; |
1da177e4 | 679 | break; |
e71a4783 SH |
680 | } |
681 | if (!ling.l_onoff) | |
682 | sock_reset_flag(sk, SOCK_LINGER); | |
683 | else { | |
1da177e4 | 684 | #if (BITS_PER_LONG == 32) |
e71a4783 SH |
685 | if ((unsigned int)ling.l_linger >= MAX_SCHEDULE_TIMEOUT/HZ) |
686 | sk->sk_lingertime = MAX_SCHEDULE_TIMEOUT; | |
1da177e4 | 687 | else |
e71a4783 SH |
688 | #endif |
689 | sk->sk_lingertime = (unsigned int)ling.l_linger * HZ; | |
690 | sock_set_flag(sk, SOCK_LINGER); | |
691 | } | |
692 | break; | |
693 | ||
694 | case SO_BSDCOMPAT: | |
695 | sock_warn_obsolete_bsdism("setsockopt"); | |
696 | break; | |
697 | ||
698 | case SO_PASSCRED: | |
699 | if (valbool) | |
700 | set_bit(SOCK_PASSCRED, &sock->flags); | |
701 | else | |
702 | clear_bit(SOCK_PASSCRED, &sock->flags); | |
703 | break; | |
704 | ||
705 | case SO_TIMESTAMP: | |
92f37fd2 | 706 | case SO_TIMESTAMPNS: |
e71a4783 | 707 | if (valbool) { |
92f37fd2 ED |
708 | if (optname == SO_TIMESTAMP) |
709 | sock_reset_flag(sk, SOCK_RCVTSTAMPNS); | |
710 | else | |
711 | sock_set_flag(sk, SOCK_RCVTSTAMPNS); | |
e71a4783 | 712 | sock_set_flag(sk, SOCK_RCVTSTAMP); |
20d49473 | 713 | sock_enable_timestamp(sk, SOCK_TIMESTAMP); |
92f37fd2 | 714 | } else { |
e71a4783 | 715 | sock_reset_flag(sk, SOCK_RCVTSTAMP); |
92f37fd2 ED |
716 | sock_reset_flag(sk, SOCK_RCVTSTAMPNS); |
717 | } | |
e71a4783 SH |
718 | break; |
719 | ||
20d49473 PO |
720 | case SO_TIMESTAMPING: |
721 | if (val & ~SOF_TIMESTAMPING_MASK) { | |
f249fb78 | 722 | ret = -EINVAL; |
20d49473 PO |
723 | break; |
724 | } | |
725 | sock_valbool_flag(sk, SOCK_TIMESTAMPING_TX_HARDWARE, | |
726 | val & SOF_TIMESTAMPING_TX_HARDWARE); | |
727 | sock_valbool_flag(sk, SOCK_TIMESTAMPING_TX_SOFTWARE, | |
728 | val & SOF_TIMESTAMPING_TX_SOFTWARE); | |
729 | sock_valbool_flag(sk, SOCK_TIMESTAMPING_RX_HARDWARE, | |
730 | val & SOF_TIMESTAMPING_RX_HARDWARE); | |
731 | if (val & SOF_TIMESTAMPING_RX_SOFTWARE) | |
732 | sock_enable_timestamp(sk, | |
733 | SOCK_TIMESTAMPING_RX_SOFTWARE); | |
734 | else | |
735 | sock_disable_timestamp(sk, | |
08e29af3 | 736 | (1UL << SOCK_TIMESTAMPING_RX_SOFTWARE)); |
20d49473 PO |
737 | sock_valbool_flag(sk, SOCK_TIMESTAMPING_SOFTWARE, |
738 | val & SOF_TIMESTAMPING_SOFTWARE); | |
739 | sock_valbool_flag(sk, SOCK_TIMESTAMPING_SYS_HARDWARE, | |
740 | val & SOF_TIMESTAMPING_SYS_HARDWARE); | |
741 | sock_valbool_flag(sk, SOCK_TIMESTAMPING_RAW_HARDWARE, | |
742 | val & SOF_TIMESTAMPING_RAW_HARDWARE); | |
743 | break; | |
744 | ||
e71a4783 SH |
745 | case SO_RCVLOWAT: |
746 | if (val < 0) | |
747 | val = INT_MAX; | |
748 | sk->sk_rcvlowat = val ? : 1; | |
749 | break; | |
750 | ||
751 | case SO_RCVTIMEO: | |
752 | ret = sock_set_timeout(&sk->sk_rcvtimeo, optval, optlen); | |
753 | break; | |
754 | ||
755 | case SO_SNDTIMEO: | |
756 | ret = sock_set_timeout(&sk->sk_sndtimeo, optval, optlen); | |
757 | break; | |
1da177e4 | 758 | |
e71a4783 SH |
759 | case SO_ATTACH_FILTER: |
760 | ret = -EINVAL; | |
761 | if (optlen == sizeof(struct sock_fprog)) { | |
762 | struct sock_fprog fprog; | |
1da177e4 | 763 | |
e71a4783 SH |
764 | ret = -EFAULT; |
765 | if (copy_from_user(&fprog, optval, sizeof(fprog))) | |
1da177e4 | 766 | break; |
e71a4783 SH |
767 | |
768 | ret = sk_attach_filter(&fprog, sk); | |
769 | } | |
770 | break; | |
771 | ||
772 | case SO_DETACH_FILTER: | |
55b33325 | 773 | ret = sk_detach_filter(sk); |
e71a4783 | 774 | break; |
1da177e4 | 775 | |
e71a4783 SH |
776 | case SO_PASSSEC: |
777 | if (valbool) | |
778 | set_bit(SOCK_PASSSEC, &sock->flags); | |
779 | else | |
780 | clear_bit(SOCK_PASSSEC, &sock->flags); | |
781 | break; | |
4a19ec58 LAT |
782 | case SO_MARK: |
783 | if (!capable(CAP_NET_ADMIN)) | |
784 | ret = -EPERM; | |
2a91525c | 785 | else |
4a19ec58 | 786 | sk->sk_mark = val; |
4a19ec58 | 787 | break; |
877ce7c1 | 788 | |
1da177e4 LT |
789 | /* We implement the SO_SNDLOWAT etc to |
790 | not be settable (1003.1g 5.3) */ | |
3b885787 | 791 | case SO_RXQ_OVFL: |
8083f0fc | 792 | sock_valbool_flag(sk, SOCK_RXQ_OVFL, valbool); |
3b885787 | 793 | break; |
6e3e939f JB |
794 | |
795 | case SO_WIFI_STATUS: | |
796 | sock_valbool_flag(sk, SOCK_WIFI_STATUS, valbool); | |
797 | break; | |
798 | ||
e71a4783 SH |
799 | default: |
800 | ret = -ENOPROTOOPT; | |
801 | break; | |
4ec93edb | 802 | } |
1da177e4 LT |
803 | release_sock(sk); |
804 | return ret; | |
805 | } | |
2a91525c | 806 | EXPORT_SYMBOL(sock_setsockopt); |
1da177e4 LT |
807 | |
808 | ||
3f551f94 EB |
809 | void cred_to_ucred(struct pid *pid, const struct cred *cred, |
810 | struct ucred *ucred) | |
811 | { | |
812 | ucred->pid = pid_vnr(pid); | |
813 | ucred->uid = ucred->gid = -1; | |
814 | if (cred) { | |
815 | struct user_namespace *current_ns = current_user_ns(); | |
816 | ||
817 | ucred->uid = user_ns_map_uid(current_ns, cred, cred->euid); | |
818 | ucred->gid = user_ns_map_gid(current_ns, cred, cred->egid); | |
819 | } | |
820 | } | |
3924773a | 821 | EXPORT_SYMBOL_GPL(cred_to_ucred); |
3f551f94 | 822 | |
1da177e4 LT |
823 | int sock_getsockopt(struct socket *sock, int level, int optname, |
824 | char __user *optval, int __user *optlen) | |
825 | { | |
826 | struct sock *sk = sock->sk; | |
4ec93edb | 827 | |
e71a4783 | 828 | union { |
4ec93edb YH |
829 | int val; |
830 | struct linger ling; | |
1da177e4 LT |
831 | struct timeval tm; |
832 | } v; | |
4ec93edb | 833 | |
4d0392be | 834 | int lv = sizeof(int); |
1da177e4 | 835 | int len; |
4ec93edb | 836 | |
e71a4783 | 837 | if (get_user(len, optlen)) |
4ec93edb | 838 | return -EFAULT; |
e71a4783 | 839 | if (len < 0) |
1da177e4 | 840 | return -EINVAL; |
4ec93edb | 841 | |
50fee1de | 842 | memset(&v, 0, sizeof(v)); |
df0bca04 | 843 | |
2a91525c | 844 | switch (optname) { |
e71a4783 SH |
845 | case SO_DEBUG: |
846 | v.val = sock_flag(sk, SOCK_DBG); | |
847 | break; | |
848 | ||
849 | case SO_DONTROUTE: | |
850 | v.val = sock_flag(sk, SOCK_LOCALROUTE); | |
851 | break; | |
852 | ||
853 | case SO_BROADCAST: | |
854 | v.val = !!sock_flag(sk, SOCK_BROADCAST); | |
855 | break; | |
856 | ||
857 | case SO_SNDBUF: | |
858 | v.val = sk->sk_sndbuf; | |
859 | break; | |
860 | ||
861 | case SO_RCVBUF: | |
862 | v.val = sk->sk_rcvbuf; | |
863 | break; | |
864 | ||
865 | case SO_REUSEADDR: | |
866 | v.val = sk->sk_reuse; | |
867 | break; | |
868 | ||
869 | case SO_KEEPALIVE: | |
870 | v.val = !!sock_flag(sk, SOCK_KEEPOPEN); | |
871 | break; | |
872 | ||
873 | case SO_TYPE: | |
874 | v.val = sk->sk_type; | |
875 | break; | |
876 | ||
49c794e9 JE |
877 | case SO_PROTOCOL: |
878 | v.val = sk->sk_protocol; | |
879 | break; | |
880 | ||
0d6038ee JE |
881 | case SO_DOMAIN: |
882 | v.val = sk->sk_family; | |
883 | break; | |
884 | ||
e71a4783 SH |
885 | case SO_ERROR: |
886 | v.val = -sock_error(sk); | |
2a91525c | 887 | if (v.val == 0) |
e71a4783 SH |
888 | v.val = xchg(&sk->sk_err_soft, 0); |
889 | break; | |
890 | ||
891 | case SO_OOBINLINE: | |
892 | v.val = !!sock_flag(sk, SOCK_URGINLINE); | |
893 | break; | |
894 | ||
895 | case SO_NO_CHECK: | |
896 | v.val = sk->sk_no_check; | |
897 | break; | |
898 | ||
899 | case SO_PRIORITY: | |
900 | v.val = sk->sk_priority; | |
901 | break; | |
902 | ||
903 | case SO_LINGER: | |
904 | lv = sizeof(v.ling); | |
905 | v.ling.l_onoff = !!sock_flag(sk, SOCK_LINGER); | |
906 | v.ling.l_linger = sk->sk_lingertime / HZ; | |
907 | break; | |
908 | ||
909 | case SO_BSDCOMPAT: | |
910 | sock_warn_obsolete_bsdism("getsockopt"); | |
911 | break; | |
912 | ||
913 | case SO_TIMESTAMP: | |
92f37fd2 ED |
914 | v.val = sock_flag(sk, SOCK_RCVTSTAMP) && |
915 | !sock_flag(sk, SOCK_RCVTSTAMPNS); | |
916 | break; | |
917 | ||
918 | case SO_TIMESTAMPNS: | |
919 | v.val = sock_flag(sk, SOCK_RCVTSTAMPNS); | |
e71a4783 SH |
920 | break; |
921 | ||
20d49473 PO |
922 | case SO_TIMESTAMPING: |
923 | v.val = 0; | |
924 | if (sock_flag(sk, SOCK_TIMESTAMPING_TX_HARDWARE)) | |
925 | v.val |= SOF_TIMESTAMPING_TX_HARDWARE; | |
926 | if (sock_flag(sk, SOCK_TIMESTAMPING_TX_SOFTWARE)) | |
927 | v.val |= SOF_TIMESTAMPING_TX_SOFTWARE; | |
928 | if (sock_flag(sk, SOCK_TIMESTAMPING_RX_HARDWARE)) | |
929 | v.val |= SOF_TIMESTAMPING_RX_HARDWARE; | |
930 | if (sock_flag(sk, SOCK_TIMESTAMPING_RX_SOFTWARE)) | |
931 | v.val |= SOF_TIMESTAMPING_RX_SOFTWARE; | |
932 | if (sock_flag(sk, SOCK_TIMESTAMPING_SOFTWARE)) | |
933 | v.val |= SOF_TIMESTAMPING_SOFTWARE; | |
934 | if (sock_flag(sk, SOCK_TIMESTAMPING_SYS_HARDWARE)) | |
935 | v.val |= SOF_TIMESTAMPING_SYS_HARDWARE; | |
936 | if (sock_flag(sk, SOCK_TIMESTAMPING_RAW_HARDWARE)) | |
937 | v.val |= SOF_TIMESTAMPING_RAW_HARDWARE; | |
938 | break; | |
939 | ||
e71a4783 | 940 | case SO_RCVTIMEO: |
2a91525c | 941 | lv = sizeof(struct timeval); |
e71a4783 SH |
942 | if (sk->sk_rcvtimeo == MAX_SCHEDULE_TIMEOUT) { |
943 | v.tm.tv_sec = 0; | |
944 | v.tm.tv_usec = 0; | |
945 | } else { | |
946 | v.tm.tv_sec = sk->sk_rcvtimeo / HZ; | |
947 | v.tm.tv_usec = ((sk->sk_rcvtimeo % HZ) * 1000000) / HZ; | |
948 | } | |
949 | break; | |
950 | ||
951 | case SO_SNDTIMEO: | |
2a91525c | 952 | lv = sizeof(struct timeval); |
e71a4783 SH |
953 | if (sk->sk_sndtimeo == MAX_SCHEDULE_TIMEOUT) { |
954 | v.tm.tv_sec = 0; | |
955 | v.tm.tv_usec = 0; | |
956 | } else { | |
957 | v.tm.tv_sec = sk->sk_sndtimeo / HZ; | |
958 | v.tm.tv_usec = ((sk->sk_sndtimeo % HZ) * 1000000) / HZ; | |
959 | } | |
960 | break; | |
1da177e4 | 961 | |
e71a4783 SH |
962 | case SO_RCVLOWAT: |
963 | v.val = sk->sk_rcvlowat; | |
964 | break; | |
1da177e4 | 965 | |
e71a4783 | 966 | case SO_SNDLOWAT: |
2a91525c | 967 | v.val = 1; |
e71a4783 | 968 | break; |
1da177e4 | 969 | |
e71a4783 SH |
970 | case SO_PASSCRED: |
971 | v.val = test_bit(SOCK_PASSCRED, &sock->flags) ? 1 : 0; | |
972 | break; | |
1da177e4 | 973 | |
e71a4783 | 974 | case SO_PEERCRED: |
109f6e39 EB |
975 | { |
976 | struct ucred peercred; | |
977 | if (len > sizeof(peercred)) | |
978 | len = sizeof(peercred); | |
979 | cred_to_ucred(sk->sk_peer_pid, sk->sk_peer_cred, &peercred); | |
980 | if (copy_to_user(optval, &peercred, len)) | |
e71a4783 SH |
981 | return -EFAULT; |
982 | goto lenout; | |
109f6e39 | 983 | } |
1da177e4 | 984 | |
e71a4783 SH |
985 | case SO_PEERNAME: |
986 | { | |
987 | char address[128]; | |
988 | ||
989 | if (sock->ops->getname(sock, (struct sockaddr *)address, &lv, 2)) | |
990 | return -ENOTCONN; | |
991 | if (lv < len) | |
992 | return -EINVAL; | |
993 | if (copy_to_user(optval, address, len)) | |
994 | return -EFAULT; | |
995 | goto lenout; | |
996 | } | |
1da177e4 | 997 | |
e71a4783 SH |
998 | /* Dubious BSD thing... Probably nobody even uses it, but |
999 | * the UNIX standard wants it for whatever reason... -DaveM | |
1000 | */ | |
1001 | case SO_ACCEPTCONN: | |
1002 | v.val = sk->sk_state == TCP_LISTEN; | |
1003 | break; | |
1da177e4 | 1004 | |
e71a4783 SH |
1005 | case SO_PASSSEC: |
1006 | v.val = test_bit(SOCK_PASSSEC, &sock->flags) ? 1 : 0; | |
1007 | break; | |
877ce7c1 | 1008 | |
e71a4783 SH |
1009 | case SO_PEERSEC: |
1010 | return security_socket_getpeersec_stream(sock, optval, optlen, len); | |
1da177e4 | 1011 | |
4a19ec58 LAT |
1012 | case SO_MARK: |
1013 | v.val = sk->sk_mark; | |
1014 | break; | |
1015 | ||
3b885787 NH |
1016 | case SO_RXQ_OVFL: |
1017 | v.val = !!sock_flag(sk, SOCK_RXQ_OVFL); | |
1018 | break; | |
1019 | ||
6e3e939f JB |
1020 | case SO_WIFI_STATUS: |
1021 | v.val = !!sock_flag(sk, SOCK_WIFI_STATUS); | |
1022 | break; | |
1023 | ||
e71a4783 SH |
1024 | default: |
1025 | return -ENOPROTOOPT; | |
1da177e4 | 1026 | } |
e71a4783 | 1027 | |
1da177e4 LT |
1028 | if (len > lv) |
1029 | len = lv; | |
1030 | if (copy_to_user(optval, &v, len)) | |
1031 | return -EFAULT; | |
1032 | lenout: | |
4ec93edb YH |
1033 | if (put_user(len, optlen)) |
1034 | return -EFAULT; | |
1035 | return 0; | |
1da177e4 LT |
1036 | } |
1037 | ||
a5b5bb9a IM |
1038 | /* |
1039 | * Initialize an sk_lock. | |
1040 | * | |
1041 | * (We also register the sk_lock with the lock validator.) | |
1042 | */ | |
b6f99a21 | 1043 | static inline void sock_lock_init(struct sock *sk) |
a5b5bb9a | 1044 | { |
ed07536e PZ |
1045 | sock_lock_init_class_and_name(sk, |
1046 | af_family_slock_key_strings[sk->sk_family], | |
1047 | af_family_slock_keys + sk->sk_family, | |
1048 | af_family_key_strings[sk->sk_family], | |
1049 | af_family_keys + sk->sk_family); | |
a5b5bb9a IM |
1050 | } |
1051 | ||
4dc6dc71 ED |
1052 | /* |
1053 | * Copy all fields from osk to nsk but nsk->sk_refcnt must not change yet, | |
1054 | * even temporarly, because of RCU lookups. sk_node should also be left as is. | |
68835aba | 1055 | * We must not copy fields between sk_dontcopy_begin and sk_dontcopy_end |
4dc6dc71 | 1056 | */ |
f1a6c4da PE |
1057 | static void sock_copy(struct sock *nsk, const struct sock *osk) |
1058 | { | |
1059 | #ifdef CONFIG_SECURITY_NETWORK | |
1060 | void *sptr = nsk->sk_security; | |
1061 | #endif | |
68835aba ED |
1062 | memcpy(nsk, osk, offsetof(struct sock, sk_dontcopy_begin)); |
1063 | ||
1064 | memcpy(&nsk->sk_dontcopy_end, &osk->sk_dontcopy_end, | |
1065 | osk->sk_prot->obj_size - offsetof(struct sock, sk_dontcopy_end)); | |
1066 | ||
f1a6c4da PE |
1067 | #ifdef CONFIG_SECURITY_NETWORK |
1068 | nsk->sk_security = sptr; | |
1069 | security_sk_clone(osk, nsk); | |
1070 | #endif | |
1071 | } | |
1072 | ||
fcbdf09d OP |
1073 | /* |
1074 | * caches using SLAB_DESTROY_BY_RCU should let .next pointer from nulls nodes | |
1075 | * un-modified. Special care is taken when initializing object to zero. | |
1076 | */ | |
1077 | static inline void sk_prot_clear_nulls(struct sock *sk, int size) | |
1078 | { | |
1079 | if (offsetof(struct sock, sk_node.next) != 0) | |
1080 | memset(sk, 0, offsetof(struct sock, sk_node.next)); | |
1081 | memset(&sk->sk_node.pprev, 0, | |
1082 | size - offsetof(struct sock, sk_node.pprev)); | |
1083 | } | |
1084 | ||
1085 | void sk_prot_clear_portaddr_nulls(struct sock *sk, int size) | |
1086 | { | |
1087 | unsigned long nulls1, nulls2; | |
1088 | ||
1089 | nulls1 = offsetof(struct sock, __sk_common.skc_node.next); | |
1090 | nulls2 = offsetof(struct sock, __sk_common.skc_portaddr_node.next); | |
1091 | if (nulls1 > nulls2) | |
1092 | swap(nulls1, nulls2); | |
1093 | ||
1094 | if (nulls1 != 0) | |
1095 | memset((char *)sk, 0, nulls1); | |
1096 | memset((char *)sk + nulls1 + sizeof(void *), 0, | |
1097 | nulls2 - nulls1 - sizeof(void *)); | |
1098 | memset((char *)sk + nulls2 + sizeof(void *), 0, | |
1099 | size - nulls2 - sizeof(void *)); | |
1100 | } | |
1101 | EXPORT_SYMBOL(sk_prot_clear_portaddr_nulls); | |
1102 | ||
2e4afe7b PE |
1103 | static struct sock *sk_prot_alloc(struct proto *prot, gfp_t priority, |
1104 | int family) | |
c308c1b2 PE |
1105 | { |
1106 | struct sock *sk; | |
1107 | struct kmem_cache *slab; | |
1108 | ||
1109 | slab = prot->slab; | |
e912b114 ED |
1110 | if (slab != NULL) { |
1111 | sk = kmem_cache_alloc(slab, priority & ~__GFP_ZERO); | |
1112 | if (!sk) | |
1113 | return sk; | |
1114 | if (priority & __GFP_ZERO) { | |
fcbdf09d OP |
1115 | if (prot->clear_sk) |
1116 | prot->clear_sk(sk, prot->obj_size); | |
1117 | else | |
1118 | sk_prot_clear_nulls(sk, prot->obj_size); | |
e912b114 | 1119 | } |
fcbdf09d | 1120 | } else |
c308c1b2 PE |
1121 | sk = kmalloc(prot->obj_size, priority); |
1122 | ||
2e4afe7b | 1123 | if (sk != NULL) { |
a98b65a3 VN |
1124 | kmemcheck_annotate_bitfield(sk, flags); |
1125 | ||
2e4afe7b PE |
1126 | if (security_sk_alloc(sk, family, priority)) |
1127 | goto out_free; | |
1128 | ||
1129 | if (!try_module_get(prot->owner)) | |
1130 | goto out_free_sec; | |
e022f0b4 | 1131 | sk_tx_queue_clear(sk); |
2e4afe7b PE |
1132 | } |
1133 | ||
c308c1b2 | 1134 | return sk; |
2e4afe7b PE |
1135 | |
1136 | out_free_sec: | |
1137 | security_sk_free(sk); | |
1138 | out_free: | |
1139 | if (slab != NULL) | |
1140 | kmem_cache_free(slab, sk); | |
1141 | else | |
1142 | kfree(sk); | |
1143 | return NULL; | |
c308c1b2 PE |
1144 | } |
1145 | ||
1146 | static void sk_prot_free(struct proto *prot, struct sock *sk) | |
1147 | { | |
1148 | struct kmem_cache *slab; | |
2e4afe7b | 1149 | struct module *owner; |
c308c1b2 | 1150 | |
2e4afe7b | 1151 | owner = prot->owner; |
c308c1b2 | 1152 | slab = prot->slab; |
2e4afe7b PE |
1153 | |
1154 | security_sk_free(sk); | |
c308c1b2 PE |
1155 | if (slab != NULL) |
1156 | kmem_cache_free(slab, sk); | |
1157 | else | |
1158 | kfree(sk); | |
2e4afe7b | 1159 | module_put(owner); |
c308c1b2 PE |
1160 | } |
1161 | ||
f8451725 HX |
1162 | #ifdef CONFIG_CGROUPS |
1163 | void sock_update_classid(struct sock *sk) | |
1164 | { | |
1144182a | 1165 | u32 classid; |
f8451725 | 1166 | |
1144182a PM |
1167 | rcu_read_lock(); /* doing current task, which cannot vanish. */ |
1168 | classid = task_cls_classid(current); | |
1169 | rcu_read_unlock(); | |
f8451725 HX |
1170 | if (classid && classid != sk->sk_classid) |
1171 | sk->sk_classid = classid; | |
1172 | } | |
82862742 | 1173 | EXPORT_SYMBOL(sock_update_classid); |
5bc1421e NH |
1174 | |
1175 | void sock_update_netprioidx(struct sock *sk) | |
1176 | { | |
1177 | struct cgroup_netprio_state *state; | |
1178 | if (in_interrupt()) | |
1179 | return; | |
1180 | rcu_read_lock(); | |
1181 | state = task_netprio_state(current); | |
1182 | sk->sk_cgrp_prioidx = state ? state->prioidx : 0; | |
1183 | rcu_read_unlock(); | |
1184 | } | |
1185 | EXPORT_SYMBOL_GPL(sock_update_netprioidx); | |
f8451725 HX |
1186 | #endif |
1187 | ||
1da177e4 LT |
1188 | /** |
1189 | * sk_alloc - All socket objects are allocated here | |
c4ea43c5 | 1190 | * @net: the applicable net namespace |
4dc3b16b PP |
1191 | * @family: protocol family |
1192 | * @priority: for allocation (%GFP_KERNEL, %GFP_ATOMIC, etc) | |
1193 | * @prot: struct proto associated with this new sock instance | |
1da177e4 | 1194 | */ |
1b8d7ae4 | 1195 | struct sock *sk_alloc(struct net *net, int family, gfp_t priority, |
6257ff21 | 1196 | struct proto *prot) |
1da177e4 | 1197 | { |
c308c1b2 | 1198 | struct sock *sk; |
1da177e4 | 1199 | |
154adbc8 | 1200 | sk = sk_prot_alloc(prot, priority | __GFP_ZERO, family); |
1da177e4 | 1201 | if (sk) { |
154adbc8 PE |
1202 | sk->sk_family = family; |
1203 | /* | |
1204 | * See comment in struct sock definition to understand | |
1205 | * why we need sk_prot_creator -acme | |
1206 | */ | |
1207 | sk->sk_prot = sk->sk_prot_creator = prot; | |
1208 | sock_lock_init(sk); | |
3b1e0a65 | 1209 | sock_net_set(sk, get_net(net)); |
d66ee058 | 1210 | atomic_set(&sk->sk_wmem_alloc, 1); |
f8451725 HX |
1211 | |
1212 | sock_update_classid(sk); | |
5bc1421e | 1213 | sock_update_netprioidx(sk); |
1da177e4 | 1214 | } |
a79af59e | 1215 | |
2e4afe7b | 1216 | return sk; |
1da177e4 | 1217 | } |
2a91525c | 1218 | EXPORT_SYMBOL(sk_alloc); |
1da177e4 | 1219 | |
2b85a34e | 1220 | static void __sk_free(struct sock *sk) |
1da177e4 LT |
1221 | { |
1222 | struct sk_filter *filter; | |
1da177e4 LT |
1223 | |
1224 | if (sk->sk_destruct) | |
1225 | sk->sk_destruct(sk); | |
1226 | ||
a898def2 PM |
1227 | filter = rcu_dereference_check(sk->sk_filter, |
1228 | atomic_read(&sk->sk_wmem_alloc) == 0); | |
1da177e4 | 1229 | if (filter) { |
309dd5fc | 1230 | sk_filter_uncharge(sk, filter); |
a9b3cd7f | 1231 | RCU_INIT_POINTER(sk->sk_filter, NULL); |
1da177e4 LT |
1232 | } |
1233 | ||
08e29af3 | 1234 | sock_disable_timestamp(sk, SK_FLAGS_TIMESTAMP); |
1da177e4 LT |
1235 | |
1236 | if (atomic_read(&sk->sk_omem_alloc)) | |
1237 | printk(KERN_DEBUG "%s: optmem leakage (%d bytes) detected.\n", | |
0dc47877 | 1238 | __func__, atomic_read(&sk->sk_omem_alloc)); |
1da177e4 | 1239 | |
109f6e39 EB |
1240 | if (sk->sk_peer_cred) |
1241 | put_cred(sk->sk_peer_cred); | |
1242 | put_pid(sk->sk_peer_pid); | |
3b1e0a65 | 1243 | put_net(sock_net(sk)); |
c308c1b2 | 1244 | sk_prot_free(sk->sk_prot_creator, sk); |
1da177e4 | 1245 | } |
2b85a34e ED |
1246 | |
1247 | void sk_free(struct sock *sk) | |
1248 | { | |
1249 | /* | |
25985edc | 1250 | * We subtract one from sk_wmem_alloc and can know if |
2b85a34e ED |
1251 | * some packets are still in some tx queue. |
1252 | * If not null, sock_wfree() will call __sk_free(sk) later | |
1253 | */ | |
1254 | if (atomic_dec_and_test(&sk->sk_wmem_alloc)) | |
1255 | __sk_free(sk); | |
1256 | } | |
2a91525c | 1257 | EXPORT_SYMBOL(sk_free); |
1da177e4 | 1258 | |
edf02087 | 1259 | /* |
25985edc LDM |
1260 | * Last sock_put should drop reference to sk->sk_net. It has already |
1261 | * been dropped in sk_change_net. Taking reference to stopping namespace | |
edf02087 | 1262 | * is not an option. |
25985edc | 1263 | * Take reference to a socket to remove it from hash _alive_ and after that |
edf02087 DL |
1264 | * destroy it in the context of init_net. |
1265 | */ | |
1266 | void sk_release_kernel(struct sock *sk) | |
1267 | { | |
1268 | if (sk == NULL || sk->sk_socket == NULL) | |
1269 | return; | |
1270 | ||
1271 | sock_hold(sk); | |
1272 | sock_release(sk->sk_socket); | |
65a18ec5 | 1273 | release_net(sock_net(sk)); |
3b1e0a65 | 1274 | sock_net_set(sk, get_net(&init_net)); |
edf02087 DL |
1275 | sock_put(sk); |
1276 | } | |
45af1754 | 1277 | EXPORT_SYMBOL(sk_release_kernel); |
edf02087 | 1278 | |
e56c57d0 ED |
1279 | /** |
1280 | * sk_clone_lock - clone a socket, and lock its clone | |
1281 | * @sk: the socket to clone | |
1282 | * @priority: for allocation (%GFP_KERNEL, %GFP_ATOMIC, etc) | |
1283 | * | |
1284 | * Caller must unlock socket even in error path (bh_unlock_sock(newsk)) | |
1285 | */ | |
1286 | struct sock *sk_clone_lock(const struct sock *sk, const gfp_t priority) | |
87d11ceb | 1287 | { |
8fd1d178 | 1288 | struct sock *newsk; |
87d11ceb | 1289 | |
8fd1d178 | 1290 | newsk = sk_prot_alloc(sk->sk_prot, priority, sk->sk_family); |
87d11ceb ACM |
1291 | if (newsk != NULL) { |
1292 | struct sk_filter *filter; | |
1293 | ||
892c141e | 1294 | sock_copy(newsk, sk); |
87d11ceb ACM |
1295 | |
1296 | /* SANITY */ | |
3b1e0a65 | 1297 | get_net(sock_net(newsk)); |
87d11ceb ACM |
1298 | sk_node_init(&newsk->sk_node); |
1299 | sock_lock_init(newsk); | |
1300 | bh_lock_sock(newsk); | |
fa438ccf | 1301 | newsk->sk_backlog.head = newsk->sk_backlog.tail = NULL; |
8eae939f | 1302 | newsk->sk_backlog.len = 0; |
87d11ceb ACM |
1303 | |
1304 | atomic_set(&newsk->sk_rmem_alloc, 0); | |
2b85a34e ED |
1305 | /* |
1306 | * sk_wmem_alloc set to one (see sk_free() and sock_wfree()) | |
1307 | */ | |
1308 | atomic_set(&newsk->sk_wmem_alloc, 1); | |
87d11ceb ACM |
1309 | atomic_set(&newsk->sk_omem_alloc, 0); |
1310 | skb_queue_head_init(&newsk->sk_receive_queue); | |
1311 | skb_queue_head_init(&newsk->sk_write_queue); | |
97fc2f08 CL |
1312 | #ifdef CONFIG_NET_DMA |
1313 | skb_queue_head_init(&newsk->sk_async_wait_queue); | |
1314 | #endif | |
87d11ceb | 1315 | |
b6c6712a | 1316 | spin_lock_init(&newsk->sk_dst_lock); |
87d11ceb | 1317 | rwlock_init(&newsk->sk_callback_lock); |
443aef0e PZ |
1318 | lockdep_set_class_and_name(&newsk->sk_callback_lock, |
1319 | af_callback_keys + newsk->sk_family, | |
1320 | af_family_clock_key_strings[newsk->sk_family]); | |
87d11ceb ACM |
1321 | |
1322 | newsk->sk_dst_cache = NULL; | |
1323 | newsk->sk_wmem_queued = 0; | |
1324 | newsk->sk_forward_alloc = 0; | |
1325 | newsk->sk_send_head = NULL; | |
87d11ceb ACM |
1326 | newsk->sk_userlocks = sk->sk_userlocks & ~SOCK_BINDPORT_LOCK; |
1327 | ||
1328 | sock_reset_flag(newsk, SOCK_DONE); | |
1329 | skb_queue_head_init(&newsk->sk_error_queue); | |
1330 | ||
0d7da9dd | 1331 | filter = rcu_dereference_protected(newsk->sk_filter, 1); |
87d11ceb ACM |
1332 | if (filter != NULL) |
1333 | sk_filter_charge(newsk, filter); | |
1334 | ||
1335 | if (unlikely(xfrm_sk_clone_policy(newsk))) { | |
1336 | /* It is still raw copy of parent, so invalidate | |
1337 | * destructor and make plain sk_free() */ | |
1338 | newsk->sk_destruct = NULL; | |
b0691c8e | 1339 | bh_unlock_sock(newsk); |
87d11ceb ACM |
1340 | sk_free(newsk); |
1341 | newsk = NULL; | |
1342 | goto out; | |
1343 | } | |
1344 | ||
1345 | newsk->sk_err = 0; | |
1346 | newsk->sk_priority = 0; | |
4dc6dc71 ED |
1347 | /* |
1348 | * Before updating sk_refcnt, we must commit prior changes to memory | |
1349 | * (Documentation/RCU/rculist_nulls.txt for details) | |
1350 | */ | |
1351 | smp_wmb(); | |
87d11ceb ACM |
1352 | atomic_set(&newsk->sk_refcnt, 2); |
1353 | ||
1354 | /* | |
1355 | * Increment the counter in the same struct proto as the master | |
1356 | * sock (sk_refcnt_debug_inc uses newsk->sk_prot->socks, that | |
1357 | * is the same as sk->sk_prot->socks, as this field was copied | |
1358 | * with memcpy). | |
1359 | * | |
1360 | * This _changes_ the previous behaviour, where | |
1361 | * tcp_create_openreq_child always was incrementing the | |
1362 | * equivalent to tcp_prot->socks (inet_sock_nr), so this have | |
1363 | * to be taken into account in all callers. -acme | |
1364 | */ | |
1365 | sk_refcnt_debug_inc(newsk); | |
972692e0 | 1366 | sk_set_socket(newsk, NULL); |
43815482 | 1367 | newsk->sk_wq = NULL; |
87d11ceb ACM |
1368 | |
1369 | if (newsk->sk_prot->sockets_allocated) | |
180d8cd9 | 1370 | sk_sockets_allocated_inc(newsk); |
704da560 | 1371 | |
08e29af3 | 1372 | if (newsk->sk_flags & SK_FLAGS_TIMESTAMP) |
704da560 | 1373 | net_enable_timestamp(); |
87d11ceb ACM |
1374 | } |
1375 | out: | |
1376 | return newsk; | |
1377 | } | |
e56c57d0 | 1378 | EXPORT_SYMBOL_GPL(sk_clone_lock); |
87d11ceb | 1379 | |
9958089a AK |
1380 | void sk_setup_caps(struct sock *sk, struct dst_entry *dst) |
1381 | { | |
1382 | __sk_dst_set(sk, dst); | |
1383 | sk->sk_route_caps = dst->dev->features; | |
1384 | if (sk->sk_route_caps & NETIF_F_GSO) | |
4fcd6b99 | 1385 | sk->sk_route_caps |= NETIF_F_GSO_SOFTWARE; |
a465419b | 1386 | sk->sk_route_caps &= ~sk->sk_route_nocaps; |
9958089a | 1387 | if (sk_can_gso(sk)) { |
82cc1a7a | 1388 | if (dst->header_len) { |
9958089a | 1389 | sk->sk_route_caps &= ~NETIF_F_GSO_MASK; |
82cc1a7a | 1390 | } else { |
9958089a | 1391 | sk->sk_route_caps |= NETIF_F_SG | NETIF_F_HW_CSUM; |
82cc1a7a PWJ |
1392 | sk->sk_gso_max_size = dst->dev->gso_max_size; |
1393 | } | |
9958089a AK |
1394 | } |
1395 | } | |
1396 | EXPORT_SYMBOL_GPL(sk_setup_caps); | |
1397 | ||
1da177e4 LT |
1398 | void __init sk_init(void) |
1399 | { | |
4481374c | 1400 | if (totalram_pages <= 4096) { |
1da177e4 LT |
1401 | sysctl_wmem_max = 32767; |
1402 | sysctl_rmem_max = 32767; | |
1403 | sysctl_wmem_default = 32767; | |
1404 | sysctl_rmem_default = 32767; | |
4481374c | 1405 | } else if (totalram_pages >= 131072) { |
1da177e4 LT |
1406 | sysctl_wmem_max = 131071; |
1407 | sysctl_rmem_max = 131071; | |
1408 | } | |
1409 | } | |
1410 | ||
1411 | /* | |
1412 | * Simple resource managers for sockets. | |
1413 | */ | |
1414 | ||
1415 | ||
4ec93edb YH |
1416 | /* |
1417 | * Write buffer destructor automatically called from kfree_skb. | |
1da177e4 LT |
1418 | */ |
1419 | void sock_wfree(struct sk_buff *skb) | |
1420 | { | |
1421 | struct sock *sk = skb->sk; | |
d99927f4 | 1422 | unsigned int len = skb->truesize; |
1da177e4 | 1423 | |
d99927f4 ED |
1424 | if (!sock_flag(sk, SOCK_USE_WRITE_QUEUE)) { |
1425 | /* | |
1426 | * Keep a reference on sk_wmem_alloc, this will be released | |
1427 | * after sk_write_space() call | |
1428 | */ | |
1429 | atomic_sub(len - 1, &sk->sk_wmem_alloc); | |
1da177e4 | 1430 | sk->sk_write_space(sk); |
d99927f4 ED |
1431 | len = 1; |
1432 | } | |
2b85a34e | 1433 | /* |
d99927f4 ED |
1434 | * if sk_wmem_alloc reaches 0, we must finish what sk_free() |
1435 | * could not do because of in-flight packets | |
2b85a34e | 1436 | */ |
d99927f4 | 1437 | if (atomic_sub_and_test(len, &sk->sk_wmem_alloc)) |
2b85a34e | 1438 | __sk_free(sk); |
1da177e4 | 1439 | } |
2a91525c | 1440 | EXPORT_SYMBOL(sock_wfree); |
1da177e4 | 1441 | |
4ec93edb YH |
1442 | /* |
1443 | * Read buffer destructor automatically called from kfree_skb. | |
1da177e4 LT |
1444 | */ |
1445 | void sock_rfree(struct sk_buff *skb) | |
1446 | { | |
1447 | struct sock *sk = skb->sk; | |
d361fd59 | 1448 | unsigned int len = skb->truesize; |
1da177e4 | 1449 | |
d361fd59 ED |
1450 | atomic_sub(len, &sk->sk_rmem_alloc); |
1451 | sk_mem_uncharge(sk, len); | |
1da177e4 | 1452 | } |
2a91525c | 1453 | EXPORT_SYMBOL(sock_rfree); |
1da177e4 LT |
1454 | |
1455 | ||
1456 | int sock_i_uid(struct sock *sk) | |
1457 | { | |
1458 | int uid; | |
1459 | ||
f064af1e | 1460 | read_lock_bh(&sk->sk_callback_lock); |
1da177e4 | 1461 | uid = sk->sk_socket ? SOCK_INODE(sk->sk_socket)->i_uid : 0; |
f064af1e | 1462 | read_unlock_bh(&sk->sk_callback_lock); |
1da177e4 LT |
1463 | return uid; |
1464 | } | |
2a91525c | 1465 | EXPORT_SYMBOL(sock_i_uid); |
1da177e4 LT |
1466 | |
1467 | unsigned long sock_i_ino(struct sock *sk) | |
1468 | { | |
1469 | unsigned long ino; | |
1470 | ||
f064af1e | 1471 | read_lock_bh(&sk->sk_callback_lock); |
1da177e4 | 1472 | ino = sk->sk_socket ? SOCK_INODE(sk->sk_socket)->i_ino : 0; |
f064af1e | 1473 | read_unlock_bh(&sk->sk_callback_lock); |
1da177e4 LT |
1474 | return ino; |
1475 | } | |
2a91525c | 1476 | EXPORT_SYMBOL(sock_i_ino); |
1da177e4 LT |
1477 | |
1478 | /* | |
1479 | * Allocate a skb from the socket's send buffer. | |
1480 | */ | |
86a76caf | 1481 | struct sk_buff *sock_wmalloc(struct sock *sk, unsigned long size, int force, |
dd0fc66f | 1482 | gfp_t priority) |
1da177e4 LT |
1483 | { |
1484 | if (force || atomic_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf) { | |
2a91525c | 1485 | struct sk_buff *skb = alloc_skb(size, priority); |
1da177e4 LT |
1486 | if (skb) { |
1487 | skb_set_owner_w(skb, sk); | |
1488 | return skb; | |
1489 | } | |
1490 | } | |
1491 | return NULL; | |
1492 | } | |
2a91525c | 1493 | EXPORT_SYMBOL(sock_wmalloc); |
1da177e4 LT |
1494 | |
1495 | /* | |
1496 | * Allocate a skb from the socket's receive buffer. | |
4ec93edb | 1497 | */ |
86a76caf | 1498 | struct sk_buff *sock_rmalloc(struct sock *sk, unsigned long size, int force, |
dd0fc66f | 1499 | gfp_t priority) |
1da177e4 LT |
1500 | { |
1501 | if (force || atomic_read(&sk->sk_rmem_alloc) < sk->sk_rcvbuf) { | |
1502 | struct sk_buff *skb = alloc_skb(size, priority); | |
1503 | if (skb) { | |
1504 | skb_set_owner_r(skb, sk); | |
1505 | return skb; | |
1506 | } | |
1507 | } | |
1508 | return NULL; | |
1509 | } | |
1510 | ||
4ec93edb | 1511 | /* |
1da177e4 | 1512 | * Allocate a memory block from the socket's option memory buffer. |
4ec93edb | 1513 | */ |
dd0fc66f | 1514 | void *sock_kmalloc(struct sock *sk, int size, gfp_t priority) |
1da177e4 LT |
1515 | { |
1516 | if ((unsigned)size <= sysctl_optmem_max && | |
1517 | atomic_read(&sk->sk_omem_alloc) + size < sysctl_optmem_max) { | |
1518 | void *mem; | |
1519 | /* First do the add, to avoid the race if kmalloc | |
4ec93edb | 1520 | * might sleep. |
1da177e4 LT |
1521 | */ |
1522 | atomic_add(size, &sk->sk_omem_alloc); | |
1523 | mem = kmalloc(size, priority); | |
1524 | if (mem) | |
1525 | return mem; | |
1526 | atomic_sub(size, &sk->sk_omem_alloc); | |
1527 | } | |
1528 | return NULL; | |
1529 | } | |
2a91525c | 1530 | EXPORT_SYMBOL(sock_kmalloc); |
1da177e4 LT |
1531 | |
1532 | /* | |
1533 | * Free an option memory block. | |
1534 | */ | |
1535 | void sock_kfree_s(struct sock *sk, void *mem, int size) | |
1536 | { | |
1537 | kfree(mem); | |
1538 | atomic_sub(size, &sk->sk_omem_alloc); | |
1539 | } | |
2a91525c | 1540 | EXPORT_SYMBOL(sock_kfree_s); |
1da177e4 LT |
1541 | |
1542 | /* It is almost wait_for_tcp_memory minus release_sock/lock_sock. | |
1543 | I think, these locks should be removed for datagram sockets. | |
1544 | */ | |
2a91525c | 1545 | static long sock_wait_for_wmem(struct sock *sk, long timeo) |
1da177e4 LT |
1546 | { |
1547 | DEFINE_WAIT(wait); | |
1548 | ||
1549 | clear_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags); | |
1550 | for (;;) { | |
1551 | if (!timeo) | |
1552 | break; | |
1553 | if (signal_pending(current)) | |
1554 | break; | |
1555 | set_bit(SOCK_NOSPACE, &sk->sk_socket->flags); | |
aa395145 | 1556 | prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE); |
1da177e4 LT |
1557 | if (atomic_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf) |
1558 | break; | |
1559 | if (sk->sk_shutdown & SEND_SHUTDOWN) | |
1560 | break; | |
1561 | if (sk->sk_err) | |
1562 | break; | |
1563 | timeo = schedule_timeout(timeo); | |
1564 | } | |
aa395145 | 1565 | finish_wait(sk_sleep(sk), &wait); |
1da177e4 LT |
1566 | return timeo; |
1567 | } | |
1568 | ||
1569 | ||
1570 | /* | |
1571 | * Generic send/receive buffer handlers | |
1572 | */ | |
1573 | ||
4cc7f68d HX |
1574 | struct sk_buff *sock_alloc_send_pskb(struct sock *sk, unsigned long header_len, |
1575 | unsigned long data_len, int noblock, | |
1576 | int *errcode) | |
1da177e4 LT |
1577 | { |
1578 | struct sk_buff *skb; | |
7d877f3b | 1579 | gfp_t gfp_mask; |
1da177e4 LT |
1580 | long timeo; |
1581 | int err; | |
1582 | ||
1583 | gfp_mask = sk->sk_allocation; | |
1584 | if (gfp_mask & __GFP_WAIT) | |
1585 | gfp_mask |= __GFP_REPEAT; | |
1586 | ||
1587 | timeo = sock_sndtimeo(sk, noblock); | |
1588 | while (1) { | |
1589 | err = sock_error(sk); | |
1590 | if (err != 0) | |
1591 | goto failure; | |
1592 | ||
1593 | err = -EPIPE; | |
1594 | if (sk->sk_shutdown & SEND_SHUTDOWN) | |
1595 | goto failure; | |
1596 | ||
1597 | if (atomic_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf) { | |
db38c179 | 1598 | skb = alloc_skb(header_len, gfp_mask); |
1da177e4 LT |
1599 | if (skb) { |
1600 | int npages; | |
1601 | int i; | |
1602 | ||
1603 | /* No pages, we're done... */ | |
1604 | if (!data_len) | |
1605 | break; | |
1606 | ||
1607 | npages = (data_len + (PAGE_SIZE - 1)) >> PAGE_SHIFT; | |
1608 | skb->truesize += data_len; | |
1609 | skb_shinfo(skb)->nr_frags = npages; | |
1610 | for (i = 0; i < npages; i++) { | |
1611 | struct page *page; | |
1da177e4 LT |
1612 | |
1613 | page = alloc_pages(sk->sk_allocation, 0); | |
1614 | if (!page) { | |
1615 | err = -ENOBUFS; | |
1616 | skb_shinfo(skb)->nr_frags = i; | |
1617 | kfree_skb(skb); | |
1618 | goto failure; | |
1619 | } | |
1620 | ||
ea2ab693 IC |
1621 | __skb_fill_page_desc(skb, i, |
1622 | page, 0, | |
1623 | (data_len >= PAGE_SIZE ? | |
1624 | PAGE_SIZE : | |
1625 | data_len)); | |
1da177e4 LT |
1626 | data_len -= PAGE_SIZE; |
1627 | } | |
1628 | ||
1629 | /* Full success... */ | |
1630 | break; | |
1631 | } | |
1632 | err = -ENOBUFS; | |
1633 | goto failure; | |
1634 | } | |
1635 | set_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags); | |
1636 | set_bit(SOCK_NOSPACE, &sk->sk_socket->flags); | |
1637 | err = -EAGAIN; | |
1638 | if (!timeo) | |
1639 | goto failure; | |
1640 | if (signal_pending(current)) | |
1641 | goto interrupted; | |
1642 | timeo = sock_wait_for_wmem(sk, timeo); | |
1643 | } | |
1644 | ||
1645 | skb_set_owner_w(skb, sk); | |
1646 | return skb; | |
1647 | ||
1648 | interrupted: | |
1649 | err = sock_intr_errno(timeo); | |
1650 | failure: | |
1651 | *errcode = err; | |
1652 | return NULL; | |
1653 | } | |
4cc7f68d | 1654 | EXPORT_SYMBOL(sock_alloc_send_pskb); |
1da177e4 | 1655 | |
4ec93edb | 1656 | struct sk_buff *sock_alloc_send_skb(struct sock *sk, unsigned long size, |
1da177e4 LT |
1657 | int noblock, int *errcode) |
1658 | { | |
1659 | return sock_alloc_send_pskb(sk, size, 0, noblock, errcode); | |
1660 | } | |
2a91525c | 1661 | EXPORT_SYMBOL(sock_alloc_send_skb); |
1da177e4 LT |
1662 | |
1663 | static void __lock_sock(struct sock *sk) | |
f39234d6 NK |
1664 | __releases(&sk->sk_lock.slock) |
1665 | __acquires(&sk->sk_lock.slock) | |
1da177e4 LT |
1666 | { |
1667 | DEFINE_WAIT(wait); | |
1668 | ||
e71a4783 | 1669 | for (;;) { |
1da177e4 LT |
1670 | prepare_to_wait_exclusive(&sk->sk_lock.wq, &wait, |
1671 | TASK_UNINTERRUPTIBLE); | |
1672 | spin_unlock_bh(&sk->sk_lock.slock); | |
1673 | schedule(); | |
1674 | spin_lock_bh(&sk->sk_lock.slock); | |
e71a4783 | 1675 | if (!sock_owned_by_user(sk)) |
1da177e4 LT |
1676 | break; |
1677 | } | |
1678 | finish_wait(&sk->sk_lock.wq, &wait); | |
1679 | } | |
1680 | ||
1681 | static void __release_sock(struct sock *sk) | |
f39234d6 NK |
1682 | __releases(&sk->sk_lock.slock) |
1683 | __acquires(&sk->sk_lock.slock) | |
1da177e4 LT |
1684 | { |
1685 | struct sk_buff *skb = sk->sk_backlog.head; | |
1686 | ||
1687 | do { | |
1688 | sk->sk_backlog.head = sk->sk_backlog.tail = NULL; | |
1689 | bh_unlock_sock(sk); | |
1690 | ||
1691 | do { | |
1692 | struct sk_buff *next = skb->next; | |
1693 | ||
7fee226a | 1694 | WARN_ON_ONCE(skb_dst_is_noref(skb)); |
1da177e4 | 1695 | skb->next = NULL; |
c57943a1 | 1696 | sk_backlog_rcv(sk, skb); |
1da177e4 LT |
1697 | |
1698 | /* | |
1699 | * We are in process context here with softirqs | |
1700 | * disabled, use cond_resched_softirq() to preempt. | |
1701 | * This is safe to do because we've taken the backlog | |
1702 | * queue private: | |
1703 | */ | |
1704 | cond_resched_softirq(); | |
1705 | ||
1706 | skb = next; | |
1707 | } while (skb != NULL); | |
1708 | ||
1709 | bh_lock_sock(sk); | |
e71a4783 | 1710 | } while ((skb = sk->sk_backlog.head) != NULL); |
8eae939f ZY |
1711 | |
1712 | /* | |
1713 | * Doing the zeroing here guarantee we can not loop forever | |
1714 | * while a wild producer attempts to flood us. | |
1715 | */ | |
1716 | sk->sk_backlog.len = 0; | |
1da177e4 LT |
1717 | } |
1718 | ||
1719 | /** | |
1720 | * sk_wait_data - wait for data to arrive at sk_receive_queue | |
4dc3b16b PP |
1721 | * @sk: sock to wait on |
1722 | * @timeo: for how long | |
1da177e4 LT |
1723 | * |
1724 | * Now socket state including sk->sk_err is changed only under lock, | |
1725 | * hence we may omit checks after joining wait queue. | |
1726 | * We check receive queue before schedule() only as optimization; | |
1727 | * it is very likely that release_sock() added new data. | |
1728 | */ | |
1729 | int sk_wait_data(struct sock *sk, long *timeo) | |
1730 | { | |
1731 | int rc; | |
1732 | DEFINE_WAIT(wait); | |
1733 | ||
aa395145 | 1734 | prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE); |
1da177e4 LT |
1735 | set_bit(SOCK_ASYNC_WAITDATA, &sk->sk_socket->flags); |
1736 | rc = sk_wait_event(sk, timeo, !skb_queue_empty(&sk->sk_receive_queue)); | |
1737 | clear_bit(SOCK_ASYNC_WAITDATA, &sk->sk_socket->flags); | |
aa395145 | 1738 | finish_wait(sk_sleep(sk), &wait); |
1da177e4 LT |
1739 | return rc; |
1740 | } | |
1da177e4 LT |
1741 | EXPORT_SYMBOL(sk_wait_data); |
1742 | ||
3ab224be HA |
1743 | /** |
1744 | * __sk_mem_schedule - increase sk_forward_alloc and memory_allocated | |
1745 | * @sk: socket | |
1746 | * @size: memory size to allocate | |
1747 | * @kind: allocation type | |
1748 | * | |
1749 | * If kind is SK_MEM_SEND, it means wmem allocation. Otherwise it means | |
1750 | * rmem allocation. This function assumes that protocols which have | |
1751 | * memory_pressure use sk_wmem_queued as write buffer accounting. | |
1752 | */ | |
1753 | int __sk_mem_schedule(struct sock *sk, int size, int kind) | |
1754 | { | |
1755 | struct proto *prot = sk->sk_prot; | |
1756 | int amt = sk_mem_pages(size); | |
8d987e5c | 1757 | long allocated; |
e1aab161 | 1758 | int parent_status = UNDER_LIMIT; |
3ab224be HA |
1759 | |
1760 | sk->sk_forward_alloc += amt * SK_MEM_QUANTUM; | |
180d8cd9 | 1761 | |
e1aab161 | 1762 | allocated = sk_memory_allocated_add(sk, amt, &parent_status); |
3ab224be HA |
1763 | |
1764 | /* Under limit. */ | |
e1aab161 GC |
1765 | if (parent_status == UNDER_LIMIT && |
1766 | allocated <= sk_prot_mem_limits(sk, 0)) { | |
180d8cd9 | 1767 | sk_leave_memory_pressure(sk); |
3ab224be HA |
1768 | return 1; |
1769 | } | |
1770 | ||
e1aab161 GC |
1771 | /* Under pressure. (we or our parents) */ |
1772 | if ((parent_status > SOFT_LIMIT) || | |
1773 | allocated > sk_prot_mem_limits(sk, 1)) | |
180d8cd9 | 1774 | sk_enter_memory_pressure(sk); |
3ab224be | 1775 | |
e1aab161 GC |
1776 | /* Over hard limit (we or our parents) */ |
1777 | if ((parent_status == OVER_LIMIT) || | |
1778 | (allocated > sk_prot_mem_limits(sk, 2))) | |
3ab224be HA |
1779 | goto suppress_allocation; |
1780 | ||
1781 | /* guarantee minimum buffer size under pressure */ | |
1782 | if (kind == SK_MEM_RECV) { | |
1783 | if (atomic_read(&sk->sk_rmem_alloc) < prot->sysctl_rmem[0]) | |
1784 | return 1; | |
180d8cd9 | 1785 | |
3ab224be HA |
1786 | } else { /* SK_MEM_SEND */ |
1787 | if (sk->sk_type == SOCK_STREAM) { | |
1788 | if (sk->sk_wmem_queued < prot->sysctl_wmem[0]) | |
1789 | return 1; | |
1790 | } else if (atomic_read(&sk->sk_wmem_alloc) < | |
1791 | prot->sysctl_wmem[0]) | |
1792 | return 1; | |
1793 | } | |
1794 | ||
180d8cd9 | 1795 | if (sk_has_memory_pressure(sk)) { |
1748376b ED |
1796 | int alloc; |
1797 | ||
180d8cd9 | 1798 | if (!sk_under_memory_pressure(sk)) |
1748376b | 1799 | return 1; |
180d8cd9 GC |
1800 | alloc = sk_sockets_allocated_read_positive(sk); |
1801 | if (sk_prot_mem_limits(sk, 2) > alloc * | |
3ab224be HA |
1802 | sk_mem_pages(sk->sk_wmem_queued + |
1803 | atomic_read(&sk->sk_rmem_alloc) + | |
1804 | sk->sk_forward_alloc)) | |
1805 | return 1; | |
1806 | } | |
1807 | ||
1808 | suppress_allocation: | |
1809 | ||
1810 | if (kind == SK_MEM_SEND && sk->sk_type == SOCK_STREAM) { | |
1811 | sk_stream_moderate_sndbuf(sk); | |
1812 | ||
1813 | /* Fail only if socket is _under_ its sndbuf. | |
1814 | * In this case we cannot block, so that we have to fail. | |
1815 | */ | |
1816 | if (sk->sk_wmem_queued + size >= sk->sk_sndbuf) | |
1817 | return 1; | |
1818 | } | |
1819 | ||
3847ce32 SM |
1820 | trace_sock_exceed_buf_limit(sk, prot, allocated); |
1821 | ||
3ab224be HA |
1822 | /* Alas. Undo changes. */ |
1823 | sk->sk_forward_alloc -= amt * SK_MEM_QUANTUM; | |
180d8cd9 | 1824 | |
e1aab161 | 1825 | sk_memory_allocated_sub(sk, amt, parent_status); |
180d8cd9 | 1826 | |
3ab224be HA |
1827 | return 0; |
1828 | } | |
3ab224be HA |
1829 | EXPORT_SYMBOL(__sk_mem_schedule); |
1830 | ||
1831 | /** | |
1832 | * __sk_reclaim - reclaim memory_allocated | |
1833 | * @sk: socket | |
1834 | */ | |
1835 | void __sk_mem_reclaim(struct sock *sk) | |
1836 | { | |
180d8cd9 | 1837 | sk_memory_allocated_sub(sk, |
e1aab161 | 1838 | sk->sk_forward_alloc >> SK_MEM_QUANTUM_SHIFT, 0); |
3ab224be HA |
1839 | sk->sk_forward_alloc &= SK_MEM_QUANTUM - 1; |
1840 | ||
180d8cd9 GC |
1841 | if (sk_under_memory_pressure(sk) && |
1842 | (sk_memory_allocated(sk) < sk_prot_mem_limits(sk, 0))) | |
1843 | sk_leave_memory_pressure(sk); | |
3ab224be | 1844 | } |
3ab224be HA |
1845 | EXPORT_SYMBOL(__sk_mem_reclaim); |
1846 | ||
1847 | ||
1da177e4 LT |
1848 | /* |
1849 | * Set of default routines for initialising struct proto_ops when | |
1850 | * the protocol does not support a particular function. In certain | |
1851 | * cases where it makes no sense for a protocol to have a "do nothing" | |
1852 | * function, some default processing is provided. | |
1853 | */ | |
1854 | ||
1855 | int sock_no_bind(struct socket *sock, struct sockaddr *saddr, int len) | |
1856 | { | |
1857 | return -EOPNOTSUPP; | |
1858 | } | |
2a91525c | 1859 | EXPORT_SYMBOL(sock_no_bind); |
1da177e4 | 1860 | |
4ec93edb | 1861 | int sock_no_connect(struct socket *sock, struct sockaddr *saddr, |
1da177e4 LT |
1862 | int len, int flags) |
1863 | { | |
1864 | return -EOPNOTSUPP; | |
1865 | } | |
2a91525c | 1866 | EXPORT_SYMBOL(sock_no_connect); |
1da177e4 LT |
1867 | |
1868 | int sock_no_socketpair(struct socket *sock1, struct socket *sock2) | |
1869 | { | |
1870 | return -EOPNOTSUPP; | |
1871 | } | |
2a91525c | 1872 | EXPORT_SYMBOL(sock_no_socketpair); |
1da177e4 LT |
1873 | |
1874 | int sock_no_accept(struct socket *sock, struct socket *newsock, int flags) | |
1875 | { | |
1876 | return -EOPNOTSUPP; | |
1877 | } | |
2a91525c | 1878 | EXPORT_SYMBOL(sock_no_accept); |
1da177e4 | 1879 | |
4ec93edb | 1880 | int sock_no_getname(struct socket *sock, struct sockaddr *saddr, |
1da177e4 LT |
1881 | int *len, int peer) |
1882 | { | |
1883 | return -EOPNOTSUPP; | |
1884 | } | |
2a91525c | 1885 | EXPORT_SYMBOL(sock_no_getname); |
1da177e4 | 1886 | |
2a91525c | 1887 | unsigned int sock_no_poll(struct file *file, struct socket *sock, poll_table *pt) |
1da177e4 LT |
1888 | { |
1889 | return 0; | |
1890 | } | |
2a91525c | 1891 | EXPORT_SYMBOL(sock_no_poll); |
1da177e4 LT |
1892 | |
1893 | int sock_no_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg) | |
1894 | { | |
1895 | return -EOPNOTSUPP; | |
1896 | } | |
2a91525c | 1897 | EXPORT_SYMBOL(sock_no_ioctl); |
1da177e4 LT |
1898 | |
1899 | int sock_no_listen(struct socket *sock, int backlog) | |
1900 | { | |
1901 | return -EOPNOTSUPP; | |
1902 | } | |
2a91525c | 1903 | EXPORT_SYMBOL(sock_no_listen); |
1da177e4 LT |
1904 | |
1905 | int sock_no_shutdown(struct socket *sock, int how) | |
1906 | { | |
1907 | return -EOPNOTSUPP; | |
1908 | } | |
2a91525c | 1909 | EXPORT_SYMBOL(sock_no_shutdown); |
1da177e4 LT |
1910 | |
1911 | int sock_no_setsockopt(struct socket *sock, int level, int optname, | |
b7058842 | 1912 | char __user *optval, unsigned int optlen) |
1da177e4 LT |
1913 | { |
1914 | return -EOPNOTSUPP; | |
1915 | } | |
2a91525c | 1916 | EXPORT_SYMBOL(sock_no_setsockopt); |
1da177e4 LT |
1917 | |
1918 | int sock_no_getsockopt(struct socket *sock, int level, int optname, | |
1919 | char __user *optval, int __user *optlen) | |
1920 | { | |
1921 | return -EOPNOTSUPP; | |
1922 | } | |
2a91525c | 1923 | EXPORT_SYMBOL(sock_no_getsockopt); |
1da177e4 LT |
1924 | |
1925 | int sock_no_sendmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *m, | |
1926 | size_t len) | |
1927 | { | |
1928 | return -EOPNOTSUPP; | |
1929 | } | |
2a91525c | 1930 | EXPORT_SYMBOL(sock_no_sendmsg); |
1da177e4 LT |
1931 | |
1932 | int sock_no_recvmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *m, | |
1933 | size_t len, int flags) | |
1934 | { | |
1935 | return -EOPNOTSUPP; | |
1936 | } | |
2a91525c | 1937 | EXPORT_SYMBOL(sock_no_recvmsg); |
1da177e4 LT |
1938 | |
1939 | int sock_no_mmap(struct file *file, struct socket *sock, struct vm_area_struct *vma) | |
1940 | { | |
1941 | /* Mirror missing mmap method error code */ | |
1942 | return -ENODEV; | |
1943 | } | |
2a91525c | 1944 | EXPORT_SYMBOL(sock_no_mmap); |
1da177e4 LT |
1945 | |
1946 | ssize_t sock_no_sendpage(struct socket *sock, struct page *page, int offset, size_t size, int flags) | |
1947 | { | |
1948 | ssize_t res; | |
1949 | struct msghdr msg = {.msg_flags = flags}; | |
1950 | struct kvec iov; | |
1951 | char *kaddr = kmap(page); | |
1952 | iov.iov_base = kaddr + offset; | |
1953 | iov.iov_len = size; | |
1954 | res = kernel_sendmsg(sock, &msg, &iov, 1, size); | |
1955 | kunmap(page); | |
1956 | return res; | |
1957 | } | |
2a91525c | 1958 | EXPORT_SYMBOL(sock_no_sendpage); |
1da177e4 LT |
1959 | |
1960 | /* | |
1961 | * Default Socket Callbacks | |
1962 | */ | |
1963 | ||
1964 | static void sock_def_wakeup(struct sock *sk) | |
1965 | { | |
43815482 ED |
1966 | struct socket_wq *wq; |
1967 | ||
1968 | rcu_read_lock(); | |
1969 | wq = rcu_dereference(sk->sk_wq); | |
1970 | if (wq_has_sleeper(wq)) | |
1971 | wake_up_interruptible_all(&wq->wait); | |
1972 | rcu_read_unlock(); | |
1da177e4 LT |
1973 | } |
1974 | ||
1975 | static void sock_def_error_report(struct sock *sk) | |
1976 | { | |
43815482 ED |
1977 | struct socket_wq *wq; |
1978 | ||
1979 | rcu_read_lock(); | |
1980 | wq = rcu_dereference(sk->sk_wq); | |
1981 | if (wq_has_sleeper(wq)) | |
1982 | wake_up_interruptible_poll(&wq->wait, POLLERR); | |
8d8ad9d7 | 1983 | sk_wake_async(sk, SOCK_WAKE_IO, POLL_ERR); |
43815482 | 1984 | rcu_read_unlock(); |
1da177e4 LT |
1985 | } |
1986 | ||
1987 | static void sock_def_readable(struct sock *sk, int len) | |
1988 | { | |
43815482 ED |
1989 | struct socket_wq *wq; |
1990 | ||
1991 | rcu_read_lock(); | |
1992 | wq = rcu_dereference(sk->sk_wq); | |
1993 | if (wq_has_sleeper(wq)) | |
2c6607c6 | 1994 | wake_up_interruptible_sync_poll(&wq->wait, POLLIN | POLLPRI | |
37e5540b | 1995 | POLLRDNORM | POLLRDBAND); |
8d8ad9d7 | 1996 | sk_wake_async(sk, SOCK_WAKE_WAITD, POLL_IN); |
43815482 | 1997 | rcu_read_unlock(); |
1da177e4 LT |
1998 | } |
1999 | ||
2000 | static void sock_def_write_space(struct sock *sk) | |
2001 | { | |
43815482 ED |
2002 | struct socket_wq *wq; |
2003 | ||
2004 | rcu_read_lock(); | |
1da177e4 LT |
2005 | |
2006 | /* Do not wake up a writer until he can make "significant" | |
2007 | * progress. --DaveM | |
2008 | */ | |
e71a4783 | 2009 | if ((atomic_read(&sk->sk_wmem_alloc) << 1) <= sk->sk_sndbuf) { |
43815482 ED |
2010 | wq = rcu_dereference(sk->sk_wq); |
2011 | if (wq_has_sleeper(wq)) | |
2012 | wake_up_interruptible_sync_poll(&wq->wait, POLLOUT | | |
37e5540b | 2013 | POLLWRNORM | POLLWRBAND); |
1da177e4 LT |
2014 | |
2015 | /* Should agree with poll, otherwise some programs break */ | |
2016 | if (sock_writeable(sk)) | |
8d8ad9d7 | 2017 | sk_wake_async(sk, SOCK_WAKE_SPACE, POLL_OUT); |
1da177e4 LT |
2018 | } |
2019 | ||
43815482 | 2020 | rcu_read_unlock(); |
1da177e4 LT |
2021 | } |
2022 | ||
2023 | static void sock_def_destruct(struct sock *sk) | |
2024 | { | |
a51482bd | 2025 | kfree(sk->sk_protinfo); |
1da177e4 LT |
2026 | } |
2027 | ||
2028 | void sk_send_sigurg(struct sock *sk) | |
2029 | { | |
2030 | if (sk->sk_socket && sk->sk_socket->file) | |
2031 | if (send_sigurg(&sk->sk_socket->file->f_owner)) | |
8d8ad9d7 | 2032 | sk_wake_async(sk, SOCK_WAKE_URG, POLL_PRI); |
1da177e4 | 2033 | } |
2a91525c | 2034 | EXPORT_SYMBOL(sk_send_sigurg); |
1da177e4 LT |
2035 | |
2036 | void sk_reset_timer(struct sock *sk, struct timer_list* timer, | |
2037 | unsigned long expires) | |
2038 | { | |
2039 | if (!mod_timer(timer, expires)) | |
2040 | sock_hold(sk); | |
2041 | } | |
1da177e4 LT |
2042 | EXPORT_SYMBOL(sk_reset_timer); |
2043 | ||
2044 | void sk_stop_timer(struct sock *sk, struct timer_list* timer) | |
2045 | { | |
2046 | if (timer_pending(timer) && del_timer(timer)) | |
2047 | __sock_put(sk); | |
2048 | } | |
1da177e4 LT |
2049 | EXPORT_SYMBOL(sk_stop_timer); |
2050 | ||
2051 | void sock_init_data(struct socket *sock, struct sock *sk) | |
2052 | { | |
2053 | skb_queue_head_init(&sk->sk_receive_queue); | |
2054 | skb_queue_head_init(&sk->sk_write_queue); | |
2055 | skb_queue_head_init(&sk->sk_error_queue); | |
97fc2f08 CL |
2056 | #ifdef CONFIG_NET_DMA |
2057 | skb_queue_head_init(&sk->sk_async_wait_queue); | |
2058 | #endif | |
1da177e4 LT |
2059 | |
2060 | sk->sk_send_head = NULL; | |
2061 | ||
2062 | init_timer(&sk->sk_timer); | |
4ec93edb | 2063 | |
1da177e4 LT |
2064 | sk->sk_allocation = GFP_KERNEL; |
2065 | sk->sk_rcvbuf = sysctl_rmem_default; | |
2066 | sk->sk_sndbuf = sysctl_wmem_default; | |
2067 | sk->sk_state = TCP_CLOSE; | |
972692e0 | 2068 | sk_set_socket(sk, sock); |
1da177e4 LT |
2069 | |
2070 | sock_set_flag(sk, SOCK_ZAPPED); | |
2071 | ||
e71a4783 | 2072 | if (sock) { |
1da177e4 | 2073 | sk->sk_type = sock->type; |
43815482 | 2074 | sk->sk_wq = sock->wq; |
1da177e4 LT |
2075 | sock->sk = sk; |
2076 | } else | |
43815482 | 2077 | sk->sk_wq = NULL; |
1da177e4 | 2078 | |
b6c6712a | 2079 | spin_lock_init(&sk->sk_dst_lock); |
1da177e4 | 2080 | rwlock_init(&sk->sk_callback_lock); |
443aef0e PZ |
2081 | lockdep_set_class_and_name(&sk->sk_callback_lock, |
2082 | af_callback_keys + sk->sk_family, | |
2083 | af_family_clock_key_strings[sk->sk_family]); | |
1da177e4 LT |
2084 | |
2085 | sk->sk_state_change = sock_def_wakeup; | |
2086 | sk->sk_data_ready = sock_def_readable; | |
2087 | sk->sk_write_space = sock_def_write_space; | |
2088 | sk->sk_error_report = sock_def_error_report; | |
2089 | sk->sk_destruct = sock_def_destruct; | |
2090 | ||
2091 | sk->sk_sndmsg_page = NULL; | |
2092 | sk->sk_sndmsg_off = 0; | |
2093 | ||
109f6e39 EB |
2094 | sk->sk_peer_pid = NULL; |
2095 | sk->sk_peer_cred = NULL; | |
1da177e4 LT |
2096 | sk->sk_write_pending = 0; |
2097 | sk->sk_rcvlowat = 1; | |
2098 | sk->sk_rcvtimeo = MAX_SCHEDULE_TIMEOUT; | |
2099 | sk->sk_sndtimeo = MAX_SCHEDULE_TIMEOUT; | |
2100 | ||
f37f0afb | 2101 | sk->sk_stamp = ktime_set(-1L, 0); |
1da177e4 | 2102 | |
4dc6dc71 ED |
2103 | /* |
2104 | * Before updating sk_refcnt, we must commit prior changes to memory | |
2105 | * (Documentation/RCU/rculist_nulls.txt for details) | |
2106 | */ | |
2107 | smp_wmb(); | |
1da177e4 | 2108 | atomic_set(&sk->sk_refcnt, 1); |
33c732c3 | 2109 | atomic_set(&sk->sk_drops, 0); |
1da177e4 | 2110 | } |
2a91525c | 2111 | EXPORT_SYMBOL(sock_init_data); |
1da177e4 | 2112 | |
b5606c2d | 2113 | void lock_sock_nested(struct sock *sk, int subclass) |
1da177e4 LT |
2114 | { |
2115 | might_sleep(); | |
a5b5bb9a | 2116 | spin_lock_bh(&sk->sk_lock.slock); |
d2e9117c | 2117 | if (sk->sk_lock.owned) |
1da177e4 | 2118 | __lock_sock(sk); |
d2e9117c | 2119 | sk->sk_lock.owned = 1; |
a5b5bb9a IM |
2120 | spin_unlock(&sk->sk_lock.slock); |
2121 | /* | |
2122 | * The sk_lock has mutex_lock() semantics here: | |
2123 | */ | |
fcc70d5f | 2124 | mutex_acquire(&sk->sk_lock.dep_map, subclass, 0, _RET_IP_); |
a5b5bb9a | 2125 | local_bh_enable(); |
1da177e4 | 2126 | } |
fcc70d5f | 2127 | EXPORT_SYMBOL(lock_sock_nested); |
1da177e4 | 2128 | |
b5606c2d | 2129 | void release_sock(struct sock *sk) |
1da177e4 | 2130 | { |
a5b5bb9a IM |
2131 | /* |
2132 | * The sk_lock has mutex_unlock() semantics: | |
2133 | */ | |
2134 | mutex_release(&sk->sk_lock.dep_map, 1, _RET_IP_); | |
2135 | ||
2136 | spin_lock_bh(&sk->sk_lock.slock); | |
1da177e4 LT |
2137 | if (sk->sk_backlog.tail) |
2138 | __release_sock(sk); | |
d2e9117c | 2139 | sk->sk_lock.owned = 0; |
a5b5bb9a IM |
2140 | if (waitqueue_active(&sk->sk_lock.wq)) |
2141 | wake_up(&sk->sk_lock.wq); | |
2142 | spin_unlock_bh(&sk->sk_lock.slock); | |
1da177e4 LT |
2143 | } |
2144 | EXPORT_SYMBOL(release_sock); | |
2145 | ||
8a74ad60 ED |
2146 | /** |
2147 | * lock_sock_fast - fast version of lock_sock | |
2148 | * @sk: socket | |
2149 | * | |
2150 | * This version should be used for very small section, where process wont block | |
2151 | * return false if fast path is taken | |
2152 | * sk_lock.slock locked, owned = 0, BH disabled | |
2153 | * return true if slow path is taken | |
2154 | * sk_lock.slock unlocked, owned = 1, BH enabled | |
2155 | */ | |
2156 | bool lock_sock_fast(struct sock *sk) | |
2157 | { | |
2158 | might_sleep(); | |
2159 | spin_lock_bh(&sk->sk_lock.slock); | |
2160 | ||
2161 | if (!sk->sk_lock.owned) | |
2162 | /* | |
2163 | * Note : We must disable BH | |
2164 | */ | |
2165 | return false; | |
2166 | ||
2167 | __lock_sock(sk); | |
2168 | sk->sk_lock.owned = 1; | |
2169 | spin_unlock(&sk->sk_lock.slock); | |
2170 | /* | |
2171 | * The sk_lock has mutex_lock() semantics here: | |
2172 | */ | |
2173 | mutex_acquire(&sk->sk_lock.dep_map, 0, 0, _RET_IP_); | |
2174 | local_bh_enable(); | |
2175 | return true; | |
2176 | } | |
2177 | EXPORT_SYMBOL(lock_sock_fast); | |
2178 | ||
1da177e4 | 2179 | int sock_get_timestamp(struct sock *sk, struct timeval __user *userstamp) |
4ec93edb | 2180 | { |
b7aa0bf7 | 2181 | struct timeval tv; |
1da177e4 | 2182 | if (!sock_flag(sk, SOCK_TIMESTAMP)) |
20d49473 | 2183 | sock_enable_timestamp(sk, SOCK_TIMESTAMP); |
b7aa0bf7 ED |
2184 | tv = ktime_to_timeval(sk->sk_stamp); |
2185 | if (tv.tv_sec == -1) | |
1da177e4 | 2186 | return -ENOENT; |
b7aa0bf7 ED |
2187 | if (tv.tv_sec == 0) { |
2188 | sk->sk_stamp = ktime_get_real(); | |
2189 | tv = ktime_to_timeval(sk->sk_stamp); | |
2190 | } | |
2191 | return copy_to_user(userstamp, &tv, sizeof(tv)) ? -EFAULT : 0; | |
4ec93edb | 2192 | } |
1da177e4 LT |
2193 | EXPORT_SYMBOL(sock_get_timestamp); |
2194 | ||
ae40eb1e ED |
2195 | int sock_get_timestampns(struct sock *sk, struct timespec __user *userstamp) |
2196 | { | |
2197 | struct timespec ts; | |
2198 | if (!sock_flag(sk, SOCK_TIMESTAMP)) | |
20d49473 | 2199 | sock_enable_timestamp(sk, SOCK_TIMESTAMP); |
ae40eb1e ED |
2200 | ts = ktime_to_timespec(sk->sk_stamp); |
2201 | if (ts.tv_sec == -1) | |
2202 | return -ENOENT; | |
2203 | if (ts.tv_sec == 0) { | |
2204 | sk->sk_stamp = ktime_get_real(); | |
2205 | ts = ktime_to_timespec(sk->sk_stamp); | |
2206 | } | |
2207 | return copy_to_user(userstamp, &ts, sizeof(ts)) ? -EFAULT : 0; | |
2208 | } | |
2209 | EXPORT_SYMBOL(sock_get_timestampns); | |
2210 | ||
20d49473 | 2211 | void sock_enable_timestamp(struct sock *sk, int flag) |
4ec93edb | 2212 | { |
20d49473 | 2213 | if (!sock_flag(sk, flag)) { |
08e29af3 ED |
2214 | unsigned long previous_flags = sk->sk_flags; |
2215 | ||
20d49473 PO |
2216 | sock_set_flag(sk, flag); |
2217 | /* | |
2218 | * we just set one of the two flags which require net | |
2219 | * time stamping, but time stamping might have been on | |
2220 | * already because of the other one | |
2221 | */ | |
08e29af3 | 2222 | if (!(previous_flags & SK_FLAGS_TIMESTAMP)) |
20d49473 | 2223 | net_enable_timestamp(); |
1da177e4 LT |
2224 | } |
2225 | } | |
1da177e4 LT |
2226 | |
2227 | /* | |
2228 | * Get a socket option on an socket. | |
2229 | * | |
2230 | * FIX: POSIX 1003.1g is very ambiguous here. It states that | |
2231 | * asynchronous errors should be reported by getsockopt. We assume | |
2232 | * this means if you specify SO_ERROR (otherwise whats the point of it). | |
2233 | */ | |
2234 | int sock_common_getsockopt(struct socket *sock, int level, int optname, | |
2235 | char __user *optval, int __user *optlen) | |
2236 | { | |
2237 | struct sock *sk = sock->sk; | |
2238 | ||
2239 | return sk->sk_prot->getsockopt(sk, level, optname, optval, optlen); | |
2240 | } | |
1da177e4 LT |
2241 | EXPORT_SYMBOL(sock_common_getsockopt); |
2242 | ||
3fdadf7d | 2243 | #ifdef CONFIG_COMPAT |
543d9cfe ACM |
2244 | int compat_sock_common_getsockopt(struct socket *sock, int level, int optname, |
2245 | char __user *optval, int __user *optlen) | |
3fdadf7d DM |
2246 | { |
2247 | struct sock *sk = sock->sk; | |
2248 | ||
1e51f951 | 2249 | if (sk->sk_prot->compat_getsockopt != NULL) |
543d9cfe ACM |
2250 | return sk->sk_prot->compat_getsockopt(sk, level, optname, |
2251 | optval, optlen); | |
3fdadf7d DM |
2252 | return sk->sk_prot->getsockopt(sk, level, optname, optval, optlen); |
2253 | } | |
2254 | EXPORT_SYMBOL(compat_sock_common_getsockopt); | |
2255 | #endif | |
2256 | ||
1da177e4 LT |
2257 | int sock_common_recvmsg(struct kiocb *iocb, struct socket *sock, |
2258 | struct msghdr *msg, size_t size, int flags) | |
2259 | { | |
2260 | struct sock *sk = sock->sk; | |
2261 | int addr_len = 0; | |
2262 | int err; | |
2263 | ||
2264 | err = sk->sk_prot->recvmsg(iocb, sk, msg, size, flags & MSG_DONTWAIT, | |
2265 | flags & ~MSG_DONTWAIT, &addr_len); | |
2266 | if (err >= 0) | |
2267 | msg->msg_namelen = addr_len; | |
2268 | return err; | |
2269 | } | |
1da177e4 LT |
2270 | EXPORT_SYMBOL(sock_common_recvmsg); |
2271 | ||
2272 | /* | |
2273 | * Set socket options on an inet socket. | |
2274 | */ | |
2275 | int sock_common_setsockopt(struct socket *sock, int level, int optname, | |
b7058842 | 2276 | char __user *optval, unsigned int optlen) |
1da177e4 LT |
2277 | { |
2278 | struct sock *sk = sock->sk; | |
2279 | ||
2280 | return sk->sk_prot->setsockopt(sk, level, optname, optval, optlen); | |
2281 | } | |
1da177e4 LT |
2282 | EXPORT_SYMBOL(sock_common_setsockopt); |
2283 | ||
3fdadf7d | 2284 | #ifdef CONFIG_COMPAT |
543d9cfe | 2285 | int compat_sock_common_setsockopt(struct socket *sock, int level, int optname, |
b7058842 | 2286 | char __user *optval, unsigned int optlen) |
3fdadf7d DM |
2287 | { |
2288 | struct sock *sk = sock->sk; | |
2289 | ||
543d9cfe ACM |
2290 | if (sk->sk_prot->compat_setsockopt != NULL) |
2291 | return sk->sk_prot->compat_setsockopt(sk, level, optname, | |
2292 | optval, optlen); | |
3fdadf7d DM |
2293 | return sk->sk_prot->setsockopt(sk, level, optname, optval, optlen); |
2294 | } | |
2295 | EXPORT_SYMBOL(compat_sock_common_setsockopt); | |
2296 | #endif | |
2297 | ||
1da177e4 LT |
2298 | void sk_common_release(struct sock *sk) |
2299 | { | |
2300 | if (sk->sk_prot->destroy) | |
2301 | sk->sk_prot->destroy(sk); | |
2302 | ||
2303 | /* | |
2304 | * Observation: when sock_common_release is called, processes have | |
2305 | * no access to socket. But net still has. | |
2306 | * Step one, detach it from networking: | |
2307 | * | |
2308 | * A. Remove from hash tables. | |
2309 | */ | |
2310 | ||
2311 | sk->sk_prot->unhash(sk); | |
2312 | ||
2313 | /* | |
2314 | * In this point socket cannot receive new packets, but it is possible | |
2315 | * that some packets are in flight because some CPU runs receiver and | |
2316 | * did hash table lookup before we unhashed socket. They will achieve | |
2317 | * receive queue and will be purged by socket destructor. | |
2318 | * | |
2319 | * Also we still have packets pending on receive queue and probably, | |
2320 | * our own packets waiting in device queues. sock_destroy will drain | |
2321 | * receive queue, but transmitted packets will delay socket destruction | |
2322 | * until the last reference will be released. | |
2323 | */ | |
2324 | ||
2325 | sock_orphan(sk); | |
2326 | ||
2327 | xfrm_sk_free_policy(sk); | |
2328 | ||
e6848976 | 2329 | sk_refcnt_debug_release(sk); |
1da177e4 LT |
2330 | sock_put(sk); |
2331 | } | |
1da177e4 LT |
2332 | EXPORT_SYMBOL(sk_common_release); |
2333 | ||
13ff3d6f PE |
2334 | #ifdef CONFIG_PROC_FS |
2335 | #define PROTO_INUSE_NR 64 /* should be enough for the first time */ | |
1338d466 PE |
2336 | struct prot_inuse { |
2337 | int val[PROTO_INUSE_NR]; | |
2338 | }; | |
13ff3d6f PE |
2339 | |
2340 | static DECLARE_BITMAP(proto_inuse_idx, PROTO_INUSE_NR); | |
70ee1159 PE |
2341 | |
2342 | #ifdef CONFIG_NET_NS | |
2343 | void sock_prot_inuse_add(struct net *net, struct proto *prot, int val) | |
2344 | { | |
d6d9ca0f | 2345 | __this_cpu_add(net->core.inuse->val[prot->inuse_idx], val); |
70ee1159 PE |
2346 | } |
2347 | EXPORT_SYMBOL_GPL(sock_prot_inuse_add); | |
2348 | ||
2349 | int sock_prot_inuse_get(struct net *net, struct proto *prot) | |
2350 | { | |
2351 | int cpu, idx = prot->inuse_idx; | |
2352 | int res = 0; | |
2353 | ||
2354 | for_each_possible_cpu(cpu) | |
2355 | res += per_cpu_ptr(net->core.inuse, cpu)->val[idx]; | |
2356 | ||
2357 | return res >= 0 ? res : 0; | |
2358 | } | |
2359 | EXPORT_SYMBOL_GPL(sock_prot_inuse_get); | |
2360 | ||
2c8c1e72 | 2361 | static int __net_init sock_inuse_init_net(struct net *net) |
70ee1159 PE |
2362 | { |
2363 | net->core.inuse = alloc_percpu(struct prot_inuse); | |
2364 | return net->core.inuse ? 0 : -ENOMEM; | |
2365 | } | |
2366 | ||
2c8c1e72 | 2367 | static void __net_exit sock_inuse_exit_net(struct net *net) |
70ee1159 PE |
2368 | { |
2369 | free_percpu(net->core.inuse); | |
2370 | } | |
2371 | ||
2372 | static struct pernet_operations net_inuse_ops = { | |
2373 | .init = sock_inuse_init_net, | |
2374 | .exit = sock_inuse_exit_net, | |
2375 | }; | |
2376 | ||
2377 | static __init int net_inuse_init(void) | |
2378 | { | |
2379 | if (register_pernet_subsys(&net_inuse_ops)) | |
2380 | panic("Cannot initialize net inuse counters"); | |
2381 | ||
2382 | return 0; | |
2383 | } | |
2384 | ||
2385 | core_initcall(net_inuse_init); | |
2386 | #else | |
1338d466 PE |
2387 | static DEFINE_PER_CPU(struct prot_inuse, prot_inuse); |
2388 | ||
c29a0bc4 | 2389 | void sock_prot_inuse_add(struct net *net, struct proto *prot, int val) |
1338d466 | 2390 | { |
d6d9ca0f | 2391 | __this_cpu_add(prot_inuse.val[prot->inuse_idx], val); |
1338d466 PE |
2392 | } |
2393 | EXPORT_SYMBOL_GPL(sock_prot_inuse_add); | |
2394 | ||
c29a0bc4 | 2395 | int sock_prot_inuse_get(struct net *net, struct proto *prot) |
1338d466 PE |
2396 | { |
2397 | int cpu, idx = prot->inuse_idx; | |
2398 | int res = 0; | |
2399 | ||
2400 | for_each_possible_cpu(cpu) | |
2401 | res += per_cpu(prot_inuse, cpu).val[idx]; | |
2402 | ||
2403 | return res >= 0 ? res : 0; | |
2404 | } | |
2405 | EXPORT_SYMBOL_GPL(sock_prot_inuse_get); | |
70ee1159 | 2406 | #endif |
13ff3d6f PE |
2407 | |
2408 | static void assign_proto_idx(struct proto *prot) | |
2409 | { | |
2410 | prot->inuse_idx = find_first_zero_bit(proto_inuse_idx, PROTO_INUSE_NR); | |
2411 | ||
2412 | if (unlikely(prot->inuse_idx == PROTO_INUSE_NR - 1)) { | |
2413 | printk(KERN_ERR "PROTO_INUSE_NR exhausted\n"); | |
2414 | return; | |
2415 | } | |
2416 | ||
2417 | set_bit(prot->inuse_idx, proto_inuse_idx); | |
2418 | } | |
2419 | ||
2420 | static void release_proto_idx(struct proto *prot) | |
2421 | { | |
2422 | if (prot->inuse_idx != PROTO_INUSE_NR - 1) | |
2423 | clear_bit(prot->inuse_idx, proto_inuse_idx); | |
2424 | } | |
2425 | #else | |
2426 | static inline void assign_proto_idx(struct proto *prot) | |
2427 | { | |
2428 | } | |
2429 | ||
2430 | static inline void release_proto_idx(struct proto *prot) | |
2431 | { | |
2432 | } | |
2433 | #endif | |
2434 | ||
b733c007 PE |
2435 | int proto_register(struct proto *prot, int alloc_slab) |
2436 | { | |
1da177e4 LT |
2437 | if (alloc_slab) { |
2438 | prot->slab = kmem_cache_create(prot->name, prot->obj_size, 0, | |
271b72c7 ED |
2439 | SLAB_HWCACHE_ALIGN | prot->slab_flags, |
2440 | NULL); | |
1da177e4 LT |
2441 | |
2442 | if (prot->slab == NULL) { | |
2443 | printk(KERN_CRIT "%s: Can't create sock SLAB cache!\n", | |
2444 | prot->name); | |
60e7663d | 2445 | goto out; |
1da177e4 | 2446 | } |
2e6599cb ACM |
2447 | |
2448 | if (prot->rsk_prot != NULL) { | |
faf23422 | 2449 | prot->rsk_prot->slab_name = kasprintf(GFP_KERNEL, "request_sock_%s", prot->name); |
7e56b5d6 | 2450 | if (prot->rsk_prot->slab_name == NULL) |
2e6599cb ACM |
2451 | goto out_free_sock_slab; |
2452 | ||
7e56b5d6 | 2453 | prot->rsk_prot->slab = kmem_cache_create(prot->rsk_prot->slab_name, |
2e6599cb | 2454 | prot->rsk_prot->obj_size, 0, |
20c2df83 | 2455 | SLAB_HWCACHE_ALIGN, NULL); |
2e6599cb ACM |
2456 | |
2457 | if (prot->rsk_prot->slab == NULL) { | |
2458 | printk(KERN_CRIT "%s: Can't create request sock SLAB cache!\n", | |
2459 | prot->name); | |
2460 | goto out_free_request_sock_slab_name; | |
2461 | } | |
2462 | } | |
8feaf0c0 | 2463 | |
6d6ee43e | 2464 | if (prot->twsk_prot != NULL) { |
faf23422 | 2465 | prot->twsk_prot->twsk_slab_name = kasprintf(GFP_KERNEL, "tw_sock_%s", prot->name); |
8feaf0c0 | 2466 | |
7e56b5d6 | 2467 | if (prot->twsk_prot->twsk_slab_name == NULL) |
8feaf0c0 ACM |
2468 | goto out_free_request_sock_slab; |
2469 | ||
6d6ee43e | 2470 | prot->twsk_prot->twsk_slab = |
7e56b5d6 | 2471 | kmem_cache_create(prot->twsk_prot->twsk_slab_name, |
6d6ee43e | 2472 | prot->twsk_prot->twsk_obj_size, |
3ab5aee7 ED |
2473 | 0, |
2474 | SLAB_HWCACHE_ALIGN | | |
2475 | prot->slab_flags, | |
20c2df83 | 2476 | NULL); |
6d6ee43e | 2477 | if (prot->twsk_prot->twsk_slab == NULL) |
8feaf0c0 ACM |
2478 | goto out_free_timewait_sock_slab_name; |
2479 | } | |
1da177e4 LT |
2480 | } |
2481 | ||
2a278051 | 2482 | write_lock(&proto_list_lock); |
1da177e4 | 2483 | list_add(&prot->node, &proto_list); |
13ff3d6f | 2484 | assign_proto_idx(prot); |
1da177e4 | 2485 | write_unlock(&proto_list_lock); |
b733c007 PE |
2486 | return 0; |
2487 | ||
8feaf0c0 | 2488 | out_free_timewait_sock_slab_name: |
7e56b5d6 | 2489 | kfree(prot->twsk_prot->twsk_slab_name); |
8feaf0c0 ACM |
2490 | out_free_request_sock_slab: |
2491 | if (prot->rsk_prot && prot->rsk_prot->slab) { | |
2492 | kmem_cache_destroy(prot->rsk_prot->slab); | |
2493 | prot->rsk_prot->slab = NULL; | |
2494 | } | |
2e6599cb | 2495 | out_free_request_sock_slab_name: |
72150e9b DC |
2496 | if (prot->rsk_prot) |
2497 | kfree(prot->rsk_prot->slab_name); | |
2e6599cb ACM |
2498 | out_free_sock_slab: |
2499 | kmem_cache_destroy(prot->slab); | |
2500 | prot->slab = NULL; | |
b733c007 PE |
2501 | out: |
2502 | return -ENOBUFS; | |
1da177e4 | 2503 | } |
1da177e4 LT |
2504 | EXPORT_SYMBOL(proto_register); |
2505 | ||
2506 | void proto_unregister(struct proto *prot) | |
2507 | { | |
2508 | write_lock(&proto_list_lock); | |
13ff3d6f | 2509 | release_proto_idx(prot); |
0a3f4358 PM |
2510 | list_del(&prot->node); |
2511 | write_unlock(&proto_list_lock); | |
1da177e4 LT |
2512 | |
2513 | if (prot->slab != NULL) { | |
2514 | kmem_cache_destroy(prot->slab); | |
2515 | prot->slab = NULL; | |
2516 | } | |
2517 | ||
2e6599cb | 2518 | if (prot->rsk_prot != NULL && prot->rsk_prot->slab != NULL) { |
2e6599cb | 2519 | kmem_cache_destroy(prot->rsk_prot->slab); |
7e56b5d6 | 2520 | kfree(prot->rsk_prot->slab_name); |
2e6599cb ACM |
2521 | prot->rsk_prot->slab = NULL; |
2522 | } | |
2523 | ||
6d6ee43e | 2524 | if (prot->twsk_prot != NULL && prot->twsk_prot->twsk_slab != NULL) { |
6d6ee43e | 2525 | kmem_cache_destroy(prot->twsk_prot->twsk_slab); |
7e56b5d6 | 2526 | kfree(prot->twsk_prot->twsk_slab_name); |
6d6ee43e | 2527 | prot->twsk_prot->twsk_slab = NULL; |
8feaf0c0 | 2528 | } |
1da177e4 | 2529 | } |
1da177e4 LT |
2530 | EXPORT_SYMBOL(proto_unregister); |
2531 | ||
2532 | #ifdef CONFIG_PROC_FS | |
1da177e4 | 2533 | static void *proto_seq_start(struct seq_file *seq, loff_t *pos) |
9a429c49 | 2534 | __acquires(proto_list_lock) |
1da177e4 LT |
2535 | { |
2536 | read_lock(&proto_list_lock); | |
60f0438a | 2537 | return seq_list_start_head(&proto_list, *pos); |
1da177e4 LT |
2538 | } |
2539 | ||
2540 | static void *proto_seq_next(struct seq_file *seq, void *v, loff_t *pos) | |
2541 | { | |
60f0438a | 2542 | return seq_list_next(v, &proto_list, pos); |
1da177e4 LT |
2543 | } |
2544 | ||
2545 | static void proto_seq_stop(struct seq_file *seq, void *v) | |
9a429c49 | 2546 | __releases(proto_list_lock) |
1da177e4 LT |
2547 | { |
2548 | read_unlock(&proto_list_lock); | |
2549 | } | |
2550 | ||
2551 | static char proto_method_implemented(const void *method) | |
2552 | { | |
2553 | return method == NULL ? 'n' : 'y'; | |
2554 | } | |
180d8cd9 GC |
2555 | static long sock_prot_memory_allocated(struct proto *proto) |
2556 | { | |
2557 | return proto->memory_allocated != NULL ? proto_memory_allocated(proto): -1L; | |
2558 | } | |
2559 | ||
2560 | static char *sock_prot_memory_pressure(struct proto *proto) | |
2561 | { | |
2562 | return proto->memory_pressure != NULL ? | |
2563 | proto_memory_pressure(proto) ? "yes" : "no" : "NI"; | |
2564 | } | |
1da177e4 LT |
2565 | |
2566 | static void proto_seq_printf(struct seq_file *seq, struct proto *proto) | |
2567 | { | |
180d8cd9 | 2568 | |
8d987e5c | 2569 | seq_printf(seq, "%-9s %4u %6d %6ld %-3s %6u %-3s %-10s " |
1da177e4 LT |
2570 | "%2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c\n", |
2571 | proto->name, | |
2572 | proto->obj_size, | |
14e943db | 2573 | sock_prot_inuse_get(seq_file_net(seq), proto), |
180d8cd9 GC |
2574 | sock_prot_memory_allocated(proto), |
2575 | sock_prot_memory_pressure(proto), | |
1da177e4 LT |
2576 | proto->max_header, |
2577 | proto->slab == NULL ? "no" : "yes", | |
2578 | module_name(proto->owner), | |
2579 | proto_method_implemented(proto->close), | |
2580 | proto_method_implemented(proto->connect), | |
2581 | proto_method_implemented(proto->disconnect), | |
2582 | proto_method_implemented(proto->accept), | |
2583 | proto_method_implemented(proto->ioctl), | |
2584 | proto_method_implemented(proto->init), | |
2585 | proto_method_implemented(proto->destroy), | |
2586 | proto_method_implemented(proto->shutdown), | |
2587 | proto_method_implemented(proto->setsockopt), | |
2588 | proto_method_implemented(proto->getsockopt), | |
2589 | proto_method_implemented(proto->sendmsg), | |
2590 | proto_method_implemented(proto->recvmsg), | |
2591 | proto_method_implemented(proto->sendpage), | |
2592 | proto_method_implemented(proto->bind), | |
2593 | proto_method_implemented(proto->backlog_rcv), | |
2594 | proto_method_implemented(proto->hash), | |
2595 | proto_method_implemented(proto->unhash), | |
2596 | proto_method_implemented(proto->get_port), | |
2597 | proto_method_implemented(proto->enter_memory_pressure)); | |
2598 | } | |
2599 | ||
2600 | static int proto_seq_show(struct seq_file *seq, void *v) | |
2601 | { | |
60f0438a | 2602 | if (v == &proto_list) |
1da177e4 LT |
2603 | seq_printf(seq, "%-9s %-4s %-8s %-6s %-5s %-7s %-4s %-10s %s", |
2604 | "protocol", | |
2605 | "size", | |
2606 | "sockets", | |
2607 | "memory", | |
2608 | "press", | |
2609 | "maxhdr", | |
2610 | "slab", | |
2611 | "module", | |
2612 | "cl co di ac io in de sh ss gs se re sp bi br ha uh gp em\n"); | |
2613 | else | |
60f0438a | 2614 | proto_seq_printf(seq, list_entry(v, struct proto, node)); |
1da177e4 LT |
2615 | return 0; |
2616 | } | |
2617 | ||
f690808e | 2618 | static const struct seq_operations proto_seq_ops = { |
1da177e4 LT |
2619 | .start = proto_seq_start, |
2620 | .next = proto_seq_next, | |
2621 | .stop = proto_seq_stop, | |
2622 | .show = proto_seq_show, | |
2623 | }; | |
2624 | ||
2625 | static int proto_seq_open(struct inode *inode, struct file *file) | |
2626 | { | |
14e943db ED |
2627 | return seq_open_net(inode, file, &proto_seq_ops, |
2628 | sizeof(struct seq_net_private)); | |
1da177e4 LT |
2629 | } |
2630 | ||
9a32144e | 2631 | static const struct file_operations proto_seq_fops = { |
1da177e4 LT |
2632 | .owner = THIS_MODULE, |
2633 | .open = proto_seq_open, | |
2634 | .read = seq_read, | |
2635 | .llseek = seq_lseek, | |
14e943db ED |
2636 | .release = seq_release_net, |
2637 | }; | |
2638 | ||
2639 | static __net_init int proto_init_net(struct net *net) | |
2640 | { | |
2641 | if (!proc_net_fops_create(net, "protocols", S_IRUGO, &proto_seq_fops)) | |
2642 | return -ENOMEM; | |
2643 | ||
2644 | return 0; | |
2645 | } | |
2646 | ||
2647 | static __net_exit void proto_exit_net(struct net *net) | |
2648 | { | |
2649 | proc_net_remove(net, "protocols"); | |
2650 | } | |
2651 | ||
2652 | ||
2653 | static __net_initdata struct pernet_operations proto_net_ops = { | |
2654 | .init = proto_init_net, | |
2655 | .exit = proto_exit_net, | |
1da177e4 LT |
2656 | }; |
2657 | ||
2658 | static int __init proto_init(void) | |
2659 | { | |
14e943db | 2660 | return register_pernet_subsys(&proto_net_ops); |
1da177e4 LT |
2661 | } |
2662 | ||
2663 | subsys_initcall(proto_init); | |
2664 | ||
2665 | #endif /* PROC_FS */ |