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> |
1da177e4 LT |
113 | |
114 | #include <asm/uaccess.h> | |
115 | #include <asm/system.h> | |
116 | ||
117 | #include <linux/netdevice.h> | |
118 | #include <net/protocol.h> | |
119 | #include <linux/skbuff.h> | |
457c4cbc | 120 | #include <net/net_namespace.h> |
2e6599cb | 121 | #include <net/request_sock.h> |
1da177e4 | 122 | #include <net/sock.h> |
20d49473 | 123 | #include <linux/net_tstamp.h> |
1da177e4 LT |
124 | #include <net/xfrm.h> |
125 | #include <linux/ipsec.h> | |
126 | ||
127 | #include <linux/filter.h> | |
128 | ||
129 | #ifdef CONFIG_INET | |
130 | #include <net/tcp.h> | |
131 | #endif | |
132 | ||
da21f24d IM |
133 | /* |
134 | * Each address family might have different locking rules, so we have | |
135 | * one slock key per address family: | |
136 | */ | |
a5b5bb9a IM |
137 | static struct lock_class_key af_family_keys[AF_MAX]; |
138 | static struct lock_class_key af_family_slock_keys[AF_MAX]; | |
139 | ||
a5b5bb9a IM |
140 | /* |
141 | * Make lock validator output more readable. (we pre-construct these | |
142 | * strings build-time, so that runtime initialization of socket | |
143 | * locks is fast): | |
144 | */ | |
145 | static const char *af_family_key_strings[AF_MAX+1] = { | |
146 | "sk_lock-AF_UNSPEC", "sk_lock-AF_UNIX" , "sk_lock-AF_INET" , | |
147 | "sk_lock-AF_AX25" , "sk_lock-AF_IPX" , "sk_lock-AF_APPLETALK", | |
148 | "sk_lock-AF_NETROM", "sk_lock-AF_BRIDGE" , "sk_lock-AF_ATMPVC" , | |
149 | "sk_lock-AF_X25" , "sk_lock-AF_INET6" , "sk_lock-AF_ROSE" , | |
150 | "sk_lock-AF_DECnet", "sk_lock-AF_NETBEUI" , "sk_lock-AF_SECURITY" , | |
151 | "sk_lock-AF_KEY" , "sk_lock-AF_NETLINK" , "sk_lock-AF_PACKET" , | |
152 | "sk_lock-AF_ASH" , "sk_lock-AF_ECONET" , "sk_lock-AF_ATMSVC" , | |
cbd151bf | 153 | "sk_lock-AF_RDS" , "sk_lock-AF_SNA" , "sk_lock-AF_IRDA" , |
a5b5bb9a | 154 | "sk_lock-AF_PPPOX" , "sk_lock-AF_WANPIPE" , "sk_lock-AF_LLC" , |
cd05acfe | 155 | "sk_lock-27" , "sk_lock-28" , "sk_lock-AF_CAN" , |
17926a79 | 156 | "sk_lock-AF_TIPC" , "sk_lock-AF_BLUETOOTH", "sk_lock-IUCV" , |
bce7b154 | 157 | "sk_lock-AF_RXRPC" , "sk_lock-AF_ISDN" , "sk_lock-AF_PHONET" , |
fcb94e42 | 158 | "sk_lock-AF_IEEE802154", |
bce7b154 | 159 | "sk_lock-AF_MAX" |
a5b5bb9a IM |
160 | }; |
161 | static const char *af_family_slock_key_strings[AF_MAX+1] = { | |
162 | "slock-AF_UNSPEC", "slock-AF_UNIX" , "slock-AF_INET" , | |
163 | "slock-AF_AX25" , "slock-AF_IPX" , "slock-AF_APPLETALK", | |
164 | "slock-AF_NETROM", "slock-AF_BRIDGE" , "slock-AF_ATMPVC" , | |
165 | "slock-AF_X25" , "slock-AF_INET6" , "slock-AF_ROSE" , | |
166 | "slock-AF_DECnet", "slock-AF_NETBEUI" , "slock-AF_SECURITY" , | |
167 | "slock-AF_KEY" , "slock-AF_NETLINK" , "slock-AF_PACKET" , | |
168 | "slock-AF_ASH" , "slock-AF_ECONET" , "slock-AF_ATMSVC" , | |
cbd151bf | 169 | "slock-AF_RDS" , "slock-AF_SNA" , "slock-AF_IRDA" , |
a5b5bb9a | 170 | "slock-AF_PPPOX" , "slock-AF_WANPIPE" , "slock-AF_LLC" , |
cd05acfe | 171 | "slock-27" , "slock-28" , "slock-AF_CAN" , |
17926a79 | 172 | "slock-AF_TIPC" , "slock-AF_BLUETOOTH", "slock-AF_IUCV" , |
bce7b154 | 173 | "slock-AF_RXRPC" , "slock-AF_ISDN" , "slock-AF_PHONET" , |
fcb94e42 | 174 | "slock-AF_IEEE802154", |
bce7b154 | 175 | "slock-AF_MAX" |
a5b5bb9a | 176 | }; |
443aef0e PZ |
177 | static const char *af_family_clock_key_strings[AF_MAX+1] = { |
178 | "clock-AF_UNSPEC", "clock-AF_UNIX" , "clock-AF_INET" , | |
179 | "clock-AF_AX25" , "clock-AF_IPX" , "clock-AF_APPLETALK", | |
180 | "clock-AF_NETROM", "clock-AF_BRIDGE" , "clock-AF_ATMPVC" , | |
181 | "clock-AF_X25" , "clock-AF_INET6" , "clock-AF_ROSE" , | |
182 | "clock-AF_DECnet", "clock-AF_NETBEUI" , "clock-AF_SECURITY" , | |
183 | "clock-AF_KEY" , "clock-AF_NETLINK" , "clock-AF_PACKET" , | |
184 | "clock-AF_ASH" , "clock-AF_ECONET" , "clock-AF_ATMSVC" , | |
cbd151bf | 185 | "clock-AF_RDS" , "clock-AF_SNA" , "clock-AF_IRDA" , |
443aef0e | 186 | "clock-AF_PPPOX" , "clock-AF_WANPIPE" , "clock-AF_LLC" , |
b4942af6 | 187 | "clock-27" , "clock-28" , "clock-AF_CAN" , |
e51f802b | 188 | "clock-AF_TIPC" , "clock-AF_BLUETOOTH", "clock-AF_IUCV" , |
bce7b154 | 189 | "clock-AF_RXRPC" , "clock-AF_ISDN" , "clock-AF_PHONET" , |
fcb94e42 | 190 | "clock-AF_IEEE802154", |
bce7b154 | 191 | "clock-AF_MAX" |
443aef0e | 192 | }; |
da21f24d IM |
193 | |
194 | /* | |
195 | * sk_callback_lock locking rules are per-address-family, | |
196 | * so split the lock classes by using a per-AF key: | |
197 | */ | |
198 | static struct lock_class_key af_callback_keys[AF_MAX]; | |
199 | ||
1da177e4 LT |
200 | /* Take into consideration the size of the struct sk_buff overhead in the |
201 | * determination of these values, since that is non-constant across | |
202 | * platforms. This makes socket queueing behavior and performance | |
203 | * not depend upon such differences. | |
204 | */ | |
205 | #define _SK_MEM_PACKETS 256 | |
206 | #define _SK_MEM_OVERHEAD (sizeof(struct sk_buff) + 256) | |
207 | #define SK_WMEM_MAX (_SK_MEM_OVERHEAD * _SK_MEM_PACKETS) | |
208 | #define SK_RMEM_MAX (_SK_MEM_OVERHEAD * _SK_MEM_PACKETS) | |
209 | ||
210 | /* Run time adjustable parameters. */ | |
ab32ea5d BH |
211 | __u32 sysctl_wmem_max __read_mostly = SK_WMEM_MAX; |
212 | __u32 sysctl_rmem_max __read_mostly = SK_RMEM_MAX; | |
213 | __u32 sysctl_wmem_default __read_mostly = SK_WMEM_MAX; | |
214 | __u32 sysctl_rmem_default __read_mostly = SK_RMEM_MAX; | |
1da177e4 LT |
215 | |
216 | /* Maximal space eaten by iovec or ancilliary data plus some space */ | |
ab32ea5d | 217 | int sysctl_optmem_max __read_mostly = sizeof(unsigned long)*(2*UIO_MAXIOV+512); |
2a91525c | 218 | EXPORT_SYMBOL(sysctl_optmem_max); |
1da177e4 LT |
219 | |
220 | static int sock_set_timeout(long *timeo_p, char __user *optval, int optlen) | |
221 | { | |
222 | struct timeval tv; | |
223 | ||
224 | if (optlen < sizeof(tv)) | |
225 | return -EINVAL; | |
226 | if (copy_from_user(&tv, optval, sizeof(tv))) | |
227 | return -EFAULT; | |
ba78073e VA |
228 | if (tv.tv_usec < 0 || tv.tv_usec >= USEC_PER_SEC) |
229 | return -EDOM; | |
1da177e4 | 230 | |
ba78073e | 231 | if (tv.tv_sec < 0) { |
6f11df83 AM |
232 | static int warned __read_mostly; |
233 | ||
ba78073e | 234 | *timeo_p = 0; |
50aab54f | 235 | if (warned < 10 && net_ratelimit()) { |
ba78073e VA |
236 | warned++; |
237 | printk(KERN_INFO "sock_set_timeout: `%s' (pid %d) " | |
238 | "tries to set negative timeout\n", | |
ba25f9dc | 239 | current->comm, task_pid_nr(current)); |
50aab54f | 240 | } |
ba78073e VA |
241 | return 0; |
242 | } | |
1da177e4 LT |
243 | *timeo_p = MAX_SCHEDULE_TIMEOUT; |
244 | if (tv.tv_sec == 0 && tv.tv_usec == 0) | |
245 | return 0; | |
246 | if (tv.tv_sec < (MAX_SCHEDULE_TIMEOUT/HZ - 1)) | |
247 | *timeo_p = tv.tv_sec*HZ + (tv.tv_usec+(1000000/HZ-1))/(1000000/HZ); | |
248 | return 0; | |
249 | } | |
250 | ||
251 | static void sock_warn_obsolete_bsdism(const char *name) | |
252 | { | |
253 | static int warned; | |
254 | static char warncomm[TASK_COMM_LEN]; | |
4ec93edb YH |
255 | if (strcmp(warncomm, current->comm) && warned < 5) { |
256 | strcpy(warncomm, current->comm); | |
1da177e4 LT |
257 | printk(KERN_WARNING "process `%s' is using obsolete " |
258 | "%s SO_BSDCOMPAT\n", warncomm, name); | |
259 | warned++; | |
260 | } | |
261 | } | |
262 | ||
20d49473 | 263 | static void sock_disable_timestamp(struct sock *sk, int flag) |
4ec93edb | 264 | { |
20d49473 PO |
265 | if (sock_flag(sk, flag)) { |
266 | sock_reset_flag(sk, flag); | |
267 | if (!sock_flag(sk, SOCK_TIMESTAMP) && | |
268 | !sock_flag(sk, SOCK_TIMESTAMPING_RX_SOFTWARE)) { | |
269 | net_disable_timestamp(); | |
270 | } | |
1da177e4 LT |
271 | } |
272 | } | |
273 | ||
274 | ||
f0088a50 DV |
275 | int sock_queue_rcv_skb(struct sock *sk, struct sk_buff *skb) |
276 | { | |
277 | int err = 0; | |
278 | int skb_len; | |
279 | ||
9ee6b7f1 | 280 | /* Cast sk->rcvbuf to unsigned... It's pointless, but reduces |
f0088a50 DV |
281 | number of warnings when compiling with -W --ANK |
282 | */ | |
283 | if (atomic_read(&sk->sk_rmem_alloc) + skb->truesize >= | |
284 | (unsigned)sk->sk_rcvbuf) { | |
285 | err = -ENOMEM; | |
286 | goto out; | |
287 | } | |
288 | ||
fda9ef5d | 289 | err = sk_filter(sk, skb); |
f0088a50 DV |
290 | if (err) |
291 | goto out; | |
292 | ||
3ab224be HA |
293 | if (!sk_rmem_schedule(sk, skb->truesize)) { |
294 | err = -ENOBUFS; | |
295 | goto out; | |
296 | } | |
297 | ||
f0088a50 DV |
298 | skb->dev = NULL; |
299 | skb_set_owner_r(skb, sk); | |
49ad9599 | 300 | |
f0088a50 DV |
301 | /* Cache the SKB length before we tack it onto the receive |
302 | * queue. Once it is added it no longer belongs to us and | |
303 | * may be freed by other threads of control pulling packets | |
304 | * from the queue. | |
305 | */ | |
306 | skb_len = skb->len; | |
307 | ||
308 | skb_queue_tail(&sk->sk_receive_queue, skb); | |
309 | ||
310 | if (!sock_flag(sk, SOCK_DEAD)) | |
311 | sk->sk_data_ready(sk, skb_len); | |
312 | out: | |
313 | return err; | |
314 | } | |
315 | EXPORT_SYMBOL(sock_queue_rcv_skb); | |
316 | ||
58a5a7b9 | 317 | int sk_receive_skb(struct sock *sk, struct sk_buff *skb, const int nested) |
f0088a50 DV |
318 | { |
319 | int rc = NET_RX_SUCCESS; | |
320 | ||
fda9ef5d | 321 | if (sk_filter(sk, skb)) |
f0088a50 DV |
322 | goto discard_and_relse; |
323 | ||
324 | skb->dev = NULL; | |
325 | ||
58a5a7b9 ACM |
326 | if (nested) |
327 | bh_lock_sock_nested(sk); | |
328 | else | |
329 | bh_lock_sock(sk); | |
a5b5bb9a IM |
330 | if (!sock_owned_by_user(sk)) { |
331 | /* | |
332 | * trylock + unlock semantics: | |
333 | */ | |
334 | mutex_acquire(&sk->sk_lock.dep_map, 0, 1, _RET_IP_); | |
335 | ||
c57943a1 | 336 | rc = sk_backlog_rcv(sk, skb); |
a5b5bb9a IM |
337 | |
338 | mutex_release(&sk->sk_lock.dep_map, 1, _RET_IP_); | |
339 | } else | |
f0088a50 DV |
340 | sk_add_backlog(sk, skb); |
341 | bh_unlock_sock(sk); | |
342 | out: | |
343 | sock_put(sk); | |
344 | return rc; | |
345 | discard_and_relse: | |
346 | kfree_skb(skb); | |
347 | goto out; | |
348 | } | |
349 | EXPORT_SYMBOL(sk_receive_skb); | |
350 | ||
351 | struct dst_entry *__sk_dst_check(struct sock *sk, u32 cookie) | |
352 | { | |
353 | struct dst_entry *dst = sk->sk_dst_cache; | |
354 | ||
355 | if (dst && dst->obsolete && dst->ops->check(dst, cookie) == NULL) { | |
356 | sk->sk_dst_cache = NULL; | |
357 | dst_release(dst); | |
358 | return NULL; | |
359 | } | |
360 | ||
361 | return dst; | |
362 | } | |
363 | EXPORT_SYMBOL(__sk_dst_check); | |
364 | ||
365 | struct dst_entry *sk_dst_check(struct sock *sk, u32 cookie) | |
366 | { | |
367 | struct dst_entry *dst = sk_dst_get(sk); | |
368 | ||
369 | if (dst && dst->obsolete && dst->ops->check(dst, cookie) == NULL) { | |
370 | sk_dst_reset(sk); | |
371 | dst_release(dst); | |
372 | return NULL; | |
373 | } | |
374 | ||
375 | return dst; | |
376 | } | |
377 | EXPORT_SYMBOL(sk_dst_check); | |
378 | ||
4878809f DM |
379 | static int sock_bindtodevice(struct sock *sk, char __user *optval, int optlen) |
380 | { | |
381 | int ret = -ENOPROTOOPT; | |
382 | #ifdef CONFIG_NETDEVICES | |
3b1e0a65 | 383 | struct net *net = sock_net(sk); |
4878809f DM |
384 | char devname[IFNAMSIZ]; |
385 | int index; | |
386 | ||
387 | /* Sorry... */ | |
388 | ret = -EPERM; | |
389 | if (!capable(CAP_NET_RAW)) | |
390 | goto out; | |
391 | ||
392 | ret = -EINVAL; | |
393 | if (optlen < 0) | |
394 | goto out; | |
395 | ||
396 | /* Bind this socket to a particular device like "eth0", | |
397 | * as specified in the passed interface name. If the | |
398 | * name is "" or the option length is zero the socket | |
399 | * is not bound. | |
400 | */ | |
401 | if (optlen > IFNAMSIZ - 1) | |
402 | optlen = IFNAMSIZ - 1; | |
403 | memset(devname, 0, sizeof(devname)); | |
404 | ||
405 | ret = -EFAULT; | |
406 | if (copy_from_user(devname, optval, optlen)) | |
407 | goto out; | |
408 | ||
409 | if (devname[0] == '\0') { | |
410 | index = 0; | |
411 | } else { | |
881d966b | 412 | struct net_device *dev = dev_get_by_name(net, devname); |
4878809f DM |
413 | |
414 | ret = -ENODEV; | |
415 | if (!dev) | |
416 | goto out; | |
417 | ||
418 | index = dev->ifindex; | |
419 | dev_put(dev); | |
420 | } | |
421 | ||
422 | lock_sock(sk); | |
423 | sk->sk_bound_dev_if = index; | |
424 | sk_dst_reset(sk); | |
425 | release_sock(sk); | |
426 | ||
427 | ret = 0; | |
428 | ||
429 | out: | |
430 | #endif | |
431 | ||
432 | return ret; | |
433 | } | |
434 | ||
c0ef877b PE |
435 | static inline void sock_valbool_flag(struct sock *sk, int bit, int valbool) |
436 | { | |
437 | if (valbool) | |
438 | sock_set_flag(sk, bit); | |
439 | else | |
440 | sock_reset_flag(sk, bit); | |
441 | } | |
442 | ||
1da177e4 LT |
443 | /* |
444 | * This is meant for all protocols to use and covers goings on | |
445 | * at the socket level. Everything here is generic. | |
446 | */ | |
447 | ||
448 | int sock_setsockopt(struct socket *sock, int level, int optname, | |
449 | char __user *optval, int optlen) | |
450 | { | |
2a91525c | 451 | struct sock *sk = sock->sk; |
1da177e4 LT |
452 | int val; |
453 | int valbool; | |
454 | struct linger ling; | |
455 | int ret = 0; | |
4ec93edb | 456 | |
1da177e4 LT |
457 | /* |
458 | * Options without arguments | |
459 | */ | |
460 | ||
4878809f DM |
461 | if (optname == SO_BINDTODEVICE) |
462 | return sock_bindtodevice(sk, optval, optlen); | |
463 | ||
e71a4783 SH |
464 | if (optlen < sizeof(int)) |
465 | return -EINVAL; | |
4ec93edb | 466 | |
1da177e4 LT |
467 | if (get_user(val, (int __user *)optval)) |
468 | return -EFAULT; | |
4ec93edb | 469 | |
2a91525c | 470 | valbool = val ? 1 : 0; |
1da177e4 LT |
471 | |
472 | lock_sock(sk); | |
473 | ||
2a91525c | 474 | switch (optname) { |
e71a4783 | 475 | case SO_DEBUG: |
2a91525c | 476 | if (val && !capable(CAP_NET_ADMIN)) |
e71a4783 | 477 | ret = -EACCES; |
2a91525c | 478 | else |
c0ef877b | 479 | sock_valbool_flag(sk, SOCK_DBG, valbool); |
e71a4783 SH |
480 | break; |
481 | case SO_REUSEADDR: | |
482 | sk->sk_reuse = valbool; | |
483 | break; | |
484 | case SO_TYPE: | |
485 | case SO_ERROR: | |
486 | ret = -ENOPROTOOPT; | |
487 | break; | |
488 | case SO_DONTROUTE: | |
c0ef877b | 489 | sock_valbool_flag(sk, SOCK_LOCALROUTE, valbool); |
e71a4783 SH |
490 | break; |
491 | case SO_BROADCAST: | |
492 | sock_valbool_flag(sk, SOCK_BROADCAST, valbool); | |
493 | break; | |
494 | case SO_SNDBUF: | |
495 | /* Don't error on this BSD doesn't and if you think | |
496 | about it this is right. Otherwise apps have to | |
497 | play 'guess the biggest size' games. RCVBUF/SNDBUF | |
498 | are treated in BSD as hints */ | |
499 | ||
500 | if (val > sysctl_wmem_max) | |
501 | val = sysctl_wmem_max; | |
b0573dea | 502 | set_sndbuf: |
e71a4783 SH |
503 | sk->sk_userlocks |= SOCK_SNDBUF_LOCK; |
504 | if ((val * 2) < SOCK_MIN_SNDBUF) | |
505 | sk->sk_sndbuf = SOCK_MIN_SNDBUF; | |
506 | else | |
507 | sk->sk_sndbuf = val * 2; | |
1da177e4 | 508 | |
e71a4783 SH |
509 | /* |
510 | * Wake up sending tasks if we | |
511 | * upped the value. | |
512 | */ | |
513 | sk->sk_write_space(sk); | |
514 | break; | |
1da177e4 | 515 | |
e71a4783 SH |
516 | case SO_SNDBUFFORCE: |
517 | if (!capable(CAP_NET_ADMIN)) { | |
518 | ret = -EPERM; | |
519 | break; | |
520 | } | |
521 | goto set_sndbuf; | |
b0573dea | 522 | |
e71a4783 SH |
523 | case SO_RCVBUF: |
524 | /* Don't error on this BSD doesn't and if you think | |
525 | about it this is right. Otherwise apps have to | |
526 | play 'guess the biggest size' games. RCVBUF/SNDBUF | |
527 | are treated in BSD as hints */ | |
4ec93edb | 528 | |
e71a4783 SH |
529 | if (val > sysctl_rmem_max) |
530 | val = sysctl_rmem_max; | |
b0573dea | 531 | set_rcvbuf: |
e71a4783 SH |
532 | sk->sk_userlocks |= SOCK_RCVBUF_LOCK; |
533 | /* | |
534 | * We double it on the way in to account for | |
535 | * "struct sk_buff" etc. overhead. Applications | |
536 | * assume that the SO_RCVBUF setting they make will | |
537 | * allow that much actual data to be received on that | |
538 | * socket. | |
539 | * | |
540 | * Applications are unaware that "struct sk_buff" and | |
541 | * other overheads allocate from the receive buffer | |
542 | * during socket buffer allocation. | |
543 | * | |
544 | * And after considering the possible alternatives, | |
545 | * returning the value we actually used in getsockopt | |
546 | * is the most desirable behavior. | |
547 | */ | |
548 | if ((val * 2) < SOCK_MIN_RCVBUF) | |
549 | sk->sk_rcvbuf = SOCK_MIN_RCVBUF; | |
550 | else | |
551 | sk->sk_rcvbuf = val * 2; | |
552 | break; | |
553 | ||
554 | case SO_RCVBUFFORCE: | |
555 | if (!capable(CAP_NET_ADMIN)) { | |
556 | ret = -EPERM; | |
1da177e4 | 557 | break; |
e71a4783 SH |
558 | } |
559 | goto set_rcvbuf; | |
1da177e4 | 560 | |
e71a4783 | 561 | case SO_KEEPALIVE: |
1da177e4 | 562 | #ifdef CONFIG_INET |
e71a4783 SH |
563 | if (sk->sk_protocol == IPPROTO_TCP) |
564 | tcp_set_keepalive(sk, valbool); | |
1da177e4 | 565 | #endif |
e71a4783 SH |
566 | sock_valbool_flag(sk, SOCK_KEEPOPEN, valbool); |
567 | break; | |
568 | ||
569 | case SO_OOBINLINE: | |
570 | sock_valbool_flag(sk, SOCK_URGINLINE, valbool); | |
571 | break; | |
572 | ||
573 | case SO_NO_CHECK: | |
574 | sk->sk_no_check = valbool; | |
575 | break; | |
576 | ||
577 | case SO_PRIORITY: | |
578 | if ((val >= 0 && val <= 6) || capable(CAP_NET_ADMIN)) | |
579 | sk->sk_priority = val; | |
580 | else | |
581 | ret = -EPERM; | |
582 | break; | |
583 | ||
584 | case SO_LINGER: | |
585 | if (optlen < sizeof(ling)) { | |
586 | ret = -EINVAL; /* 1003.1g */ | |
1da177e4 | 587 | break; |
e71a4783 | 588 | } |
2a91525c | 589 | if (copy_from_user(&ling, optval, sizeof(ling))) { |
e71a4783 | 590 | ret = -EFAULT; |
1da177e4 | 591 | break; |
e71a4783 SH |
592 | } |
593 | if (!ling.l_onoff) | |
594 | sock_reset_flag(sk, SOCK_LINGER); | |
595 | else { | |
1da177e4 | 596 | #if (BITS_PER_LONG == 32) |
e71a4783 SH |
597 | if ((unsigned int)ling.l_linger >= MAX_SCHEDULE_TIMEOUT/HZ) |
598 | sk->sk_lingertime = MAX_SCHEDULE_TIMEOUT; | |
1da177e4 | 599 | else |
e71a4783 SH |
600 | #endif |
601 | sk->sk_lingertime = (unsigned int)ling.l_linger * HZ; | |
602 | sock_set_flag(sk, SOCK_LINGER); | |
603 | } | |
604 | break; | |
605 | ||
606 | case SO_BSDCOMPAT: | |
607 | sock_warn_obsolete_bsdism("setsockopt"); | |
608 | break; | |
609 | ||
610 | case SO_PASSCRED: | |
611 | if (valbool) | |
612 | set_bit(SOCK_PASSCRED, &sock->flags); | |
613 | else | |
614 | clear_bit(SOCK_PASSCRED, &sock->flags); | |
615 | break; | |
616 | ||
617 | case SO_TIMESTAMP: | |
92f37fd2 | 618 | case SO_TIMESTAMPNS: |
e71a4783 | 619 | if (valbool) { |
92f37fd2 ED |
620 | if (optname == SO_TIMESTAMP) |
621 | sock_reset_flag(sk, SOCK_RCVTSTAMPNS); | |
622 | else | |
623 | sock_set_flag(sk, SOCK_RCVTSTAMPNS); | |
e71a4783 | 624 | sock_set_flag(sk, SOCK_RCVTSTAMP); |
20d49473 | 625 | sock_enable_timestamp(sk, SOCK_TIMESTAMP); |
92f37fd2 | 626 | } else { |
e71a4783 | 627 | sock_reset_flag(sk, SOCK_RCVTSTAMP); |
92f37fd2 ED |
628 | sock_reset_flag(sk, SOCK_RCVTSTAMPNS); |
629 | } | |
e71a4783 SH |
630 | break; |
631 | ||
20d49473 PO |
632 | case SO_TIMESTAMPING: |
633 | if (val & ~SOF_TIMESTAMPING_MASK) { | |
634 | ret = EINVAL; | |
635 | break; | |
636 | } | |
637 | sock_valbool_flag(sk, SOCK_TIMESTAMPING_TX_HARDWARE, | |
638 | val & SOF_TIMESTAMPING_TX_HARDWARE); | |
639 | sock_valbool_flag(sk, SOCK_TIMESTAMPING_TX_SOFTWARE, | |
640 | val & SOF_TIMESTAMPING_TX_SOFTWARE); | |
641 | sock_valbool_flag(sk, SOCK_TIMESTAMPING_RX_HARDWARE, | |
642 | val & SOF_TIMESTAMPING_RX_HARDWARE); | |
643 | if (val & SOF_TIMESTAMPING_RX_SOFTWARE) | |
644 | sock_enable_timestamp(sk, | |
645 | SOCK_TIMESTAMPING_RX_SOFTWARE); | |
646 | else | |
647 | sock_disable_timestamp(sk, | |
648 | SOCK_TIMESTAMPING_RX_SOFTWARE); | |
649 | sock_valbool_flag(sk, SOCK_TIMESTAMPING_SOFTWARE, | |
650 | val & SOF_TIMESTAMPING_SOFTWARE); | |
651 | sock_valbool_flag(sk, SOCK_TIMESTAMPING_SYS_HARDWARE, | |
652 | val & SOF_TIMESTAMPING_SYS_HARDWARE); | |
653 | sock_valbool_flag(sk, SOCK_TIMESTAMPING_RAW_HARDWARE, | |
654 | val & SOF_TIMESTAMPING_RAW_HARDWARE); | |
655 | break; | |
656 | ||
e71a4783 SH |
657 | case SO_RCVLOWAT: |
658 | if (val < 0) | |
659 | val = INT_MAX; | |
660 | sk->sk_rcvlowat = val ? : 1; | |
661 | break; | |
662 | ||
663 | case SO_RCVTIMEO: | |
664 | ret = sock_set_timeout(&sk->sk_rcvtimeo, optval, optlen); | |
665 | break; | |
666 | ||
667 | case SO_SNDTIMEO: | |
668 | ret = sock_set_timeout(&sk->sk_sndtimeo, optval, optlen); | |
669 | break; | |
1da177e4 | 670 | |
e71a4783 SH |
671 | case SO_ATTACH_FILTER: |
672 | ret = -EINVAL; | |
673 | if (optlen == sizeof(struct sock_fprog)) { | |
674 | struct sock_fprog fprog; | |
1da177e4 | 675 | |
e71a4783 SH |
676 | ret = -EFAULT; |
677 | if (copy_from_user(&fprog, optval, sizeof(fprog))) | |
1da177e4 | 678 | break; |
e71a4783 SH |
679 | |
680 | ret = sk_attach_filter(&fprog, sk); | |
681 | } | |
682 | break; | |
683 | ||
684 | case SO_DETACH_FILTER: | |
55b33325 | 685 | ret = sk_detach_filter(sk); |
e71a4783 | 686 | break; |
1da177e4 | 687 | |
e71a4783 SH |
688 | case SO_PASSSEC: |
689 | if (valbool) | |
690 | set_bit(SOCK_PASSSEC, &sock->flags); | |
691 | else | |
692 | clear_bit(SOCK_PASSSEC, &sock->flags); | |
693 | break; | |
4a19ec58 LAT |
694 | case SO_MARK: |
695 | if (!capable(CAP_NET_ADMIN)) | |
696 | ret = -EPERM; | |
2a91525c | 697 | else |
4a19ec58 | 698 | sk->sk_mark = val; |
4a19ec58 | 699 | break; |
877ce7c1 | 700 | |
1da177e4 LT |
701 | /* We implement the SO_SNDLOWAT etc to |
702 | not be settable (1003.1g 5.3) */ | |
e71a4783 SH |
703 | default: |
704 | ret = -ENOPROTOOPT; | |
705 | break; | |
4ec93edb | 706 | } |
1da177e4 LT |
707 | release_sock(sk); |
708 | return ret; | |
709 | } | |
2a91525c | 710 | EXPORT_SYMBOL(sock_setsockopt); |
1da177e4 LT |
711 | |
712 | ||
713 | int sock_getsockopt(struct socket *sock, int level, int optname, | |
714 | char __user *optval, int __user *optlen) | |
715 | { | |
716 | struct sock *sk = sock->sk; | |
4ec93edb | 717 | |
e71a4783 | 718 | union { |
4ec93edb YH |
719 | int val; |
720 | struct linger ling; | |
1da177e4 LT |
721 | struct timeval tm; |
722 | } v; | |
4ec93edb | 723 | |
1da177e4 LT |
724 | unsigned int lv = sizeof(int); |
725 | int len; | |
4ec93edb | 726 | |
e71a4783 | 727 | if (get_user(len, optlen)) |
4ec93edb | 728 | return -EFAULT; |
e71a4783 | 729 | if (len < 0) |
1da177e4 | 730 | return -EINVAL; |
4ec93edb | 731 | |
50fee1de | 732 | memset(&v, 0, sizeof(v)); |
df0bca04 | 733 | |
2a91525c | 734 | switch (optname) { |
e71a4783 SH |
735 | case SO_DEBUG: |
736 | v.val = sock_flag(sk, SOCK_DBG); | |
737 | break; | |
738 | ||
739 | case SO_DONTROUTE: | |
740 | v.val = sock_flag(sk, SOCK_LOCALROUTE); | |
741 | break; | |
742 | ||
743 | case SO_BROADCAST: | |
744 | v.val = !!sock_flag(sk, SOCK_BROADCAST); | |
745 | break; | |
746 | ||
747 | case SO_SNDBUF: | |
748 | v.val = sk->sk_sndbuf; | |
749 | break; | |
750 | ||
751 | case SO_RCVBUF: | |
752 | v.val = sk->sk_rcvbuf; | |
753 | break; | |
754 | ||
755 | case SO_REUSEADDR: | |
756 | v.val = sk->sk_reuse; | |
757 | break; | |
758 | ||
759 | case SO_KEEPALIVE: | |
760 | v.val = !!sock_flag(sk, SOCK_KEEPOPEN); | |
761 | break; | |
762 | ||
763 | case SO_TYPE: | |
764 | v.val = sk->sk_type; | |
765 | break; | |
766 | ||
767 | case SO_ERROR: | |
768 | v.val = -sock_error(sk); | |
2a91525c | 769 | if (v.val == 0) |
e71a4783 SH |
770 | v.val = xchg(&sk->sk_err_soft, 0); |
771 | break; | |
772 | ||
773 | case SO_OOBINLINE: | |
774 | v.val = !!sock_flag(sk, SOCK_URGINLINE); | |
775 | break; | |
776 | ||
777 | case SO_NO_CHECK: | |
778 | v.val = sk->sk_no_check; | |
779 | break; | |
780 | ||
781 | case SO_PRIORITY: | |
782 | v.val = sk->sk_priority; | |
783 | break; | |
784 | ||
785 | case SO_LINGER: | |
786 | lv = sizeof(v.ling); | |
787 | v.ling.l_onoff = !!sock_flag(sk, SOCK_LINGER); | |
788 | v.ling.l_linger = sk->sk_lingertime / HZ; | |
789 | break; | |
790 | ||
791 | case SO_BSDCOMPAT: | |
792 | sock_warn_obsolete_bsdism("getsockopt"); | |
793 | break; | |
794 | ||
795 | case SO_TIMESTAMP: | |
92f37fd2 ED |
796 | v.val = sock_flag(sk, SOCK_RCVTSTAMP) && |
797 | !sock_flag(sk, SOCK_RCVTSTAMPNS); | |
798 | break; | |
799 | ||
800 | case SO_TIMESTAMPNS: | |
801 | v.val = sock_flag(sk, SOCK_RCVTSTAMPNS); | |
e71a4783 SH |
802 | break; |
803 | ||
20d49473 PO |
804 | case SO_TIMESTAMPING: |
805 | v.val = 0; | |
806 | if (sock_flag(sk, SOCK_TIMESTAMPING_TX_HARDWARE)) | |
807 | v.val |= SOF_TIMESTAMPING_TX_HARDWARE; | |
808 | if (sock_flag(sk, SOCK_TIMESTAMPING_TX_SOFTWARE)) | |
809 | v.val |= SOF_TIMESTAMPING_TX_SOFTWARE; | |
810 | if (sock_flag(sk, SOCK_TIMESTAMPING_RX_HARDWARE)) | |
811 | v.val |= SOF_TIMESTAMPING_RX_HARDWARE; | |
812 | if (sock_flag(sk, SOCK_TIMESTAMPING_RX_SOFTWARE)) | |
813 | v.val |= SOF_TIMESTAMPING_RX_SOFTWARE; | |
814 | if (sock_flag(sk, SOCK_TIMESTAMPING_SOFTWARE)) | |
815 | v.val |= SOF_TIMESTAMPING_SOFTWARE; | |
816 | if (sock_flag(sk, SOCK_TIMESTAMPING_SYS_HARDWARE)) | |
817 | v.val |= SOF_TIMESTAMPING_SYS_HARDWARE; | |
818 | if (sock_flag(sk, SOCK_TIMESTAMPING_RAW_HARDWARE)) | |
819 | v.val |= SOF_TIMESTAMPING_RAW_HARDWARE; | |
820 | break; | |
821 | ||
e71a4783 | 822 | case SO_RCVTIMEO: |
2a91525c | 823 | lv = sizeof(struct timeval); |
e71a4783 SH |
824 | if (sk->sk_rcvtimeo == MAX_SCHEDULE_TIMEOUT) { |
825 | v.tm.tv_sec = 0; | |
826 | v.tm.tv_usec = 0; | |
827 | } else { | |
828 | v.tm.tv_sec = sk->sk_rcvtimeo / HZ; | |
829 | v.tm.tv_usec = ((sk->sk_rcvtimeo % HZ) * 1000000) / HZ; | |
830 | } | |
831 | break; | |
832 | ||
833 | case SO_SNDTIMEO: | |
2a91525c | 834 | lv = sizeof(struct timeval); |
e71a4783 SH |
835 | if (sk->sk_sndtimeo == MAX_SCHEDULE_TIMEOUT) { |
836 | v.tm.tv_sec = 0; | |
837 | v.tm.tv_usec = 0; | |
838 | } else { | |
839 | v.tm.tv_sec = sk->sk_sndtimeo / HZ; | |
840 | v.tm.tv_usec = ((sk->sk_sndtimeo % HZ) * 1000000) / HZ; | |
841 | } | |
842 | break; | |
1da177e4 | 843 | |
e71a4783 SH |
844 | case SO_RCVLOWAT: |
845 | v.val = sk->sk_rcvlowat; | |
846 | break; | |
1da177e4 | 847 | |
e71a4783 | 848 | case SO_SNDLOWAT: |
2a91525c | 849 | v.val = 1; |
e71a4783 | 850 | break; |
1da177e4 | 851 | |
e71a4783 SH |
852 | case SO_PASSCRED: |
853 | v.val = test_bit(SOCK_PASSCRED, &sock->flags) ? 1 : 0; | |
854 | break; | |
1da177e4 | 855 | |
e71a4783 SH |
856 | case SO_PEERCRED: |
857 | if (len > sizeof(sk->sk_peercred)) | |
858 | len = sizeof(sk->sk_peercred); | |
859 | if (copy_to_user(optval, &sk->sk_peercred, len)) | |
860 | return -EFAULT; | |
861 | goto lenout; | |
1da177e4 | 862 | |
e71a4783 SH |
863 | case SO_PEERNAME: |
864 | { | |
865 | char address[128]; | |
866 | ||
867 | if (sock->ops->getname(sock, (struct sockaddr *)address, &lv, 2)) | |
868 | return -ENOTCONN; | |
869 | if (lv < len) | |
870 | return -EINVAL; | |
871 | if (copy_to_user(optval, address, len)) | |
872 | return -EFAULT; | |
873 | goto lenout; | |
874 | } | |
1da177e4 | 875 | |
e71a4783 SH |
876 | /* Dubious BSD thing... Probably nobody even uses it, but |
877 | * the UNIX standard wants it for whatever reason... -DaveM | |
878 | */ | |
879 | case SO_ACCEPTCONN: | |
880 | v.val = sk->sk_state == TCP_LISTEN; | |
881 | break; | |
1da177e4 | 882 | |
e71a4783 SH |
883 | case SO_PASSSEC: |
884 | v.val = test_bit(SOCK_PASSSEC, &sock->flags) ? 1 : 0; | |
885 | break; | |
877ce7c1 | 886 | |
e71a4783 SH |
887 | case SO_PEERSEC: |
888 | return security_socket_getpeersec_stream(sock, optval, optlen, len); | |
1da177e4 | 889 | |
4a19ec58 LAT |
890 | case SO_MARK: |
891 | v.val = sk->sk_mark; | |
892 | break; | |
893 | ||
e71a4783 SH |
894 | default: |
895 | return -ENOPROTOOPT; | |
1da177e4 | 896 | } |
e71a4783 | 897 | |
1da177e4 LT |
898 | if (len > lv) |
899 | len = lv; | |
900 | if (copy_to_user(optval, &v, len)) | |
901 | return -EFAULT; | |
902 | lenout: | |
4ec93edb YH |
903 | if (put_user(len, optlen)) |
904 | return -EFAULT; | |
905 | return 0; | |
1da177e4 LT |
906 | } |
907 | ||
a5b5bb9a IM |
908 | /* |
909 | * Initialize an sk_lock. | |
910 | * | |
911 | * (We also register the sk_lock with the lock validator.) | |
912 | */ | |
b6f99a21 | 913 | static inline void sock_lock_init(struct sock *sk) |
a5b5bb9a | 914 | { |
ed07536e PZ |
915 | sock_lock_init_class_and_name(sk, |
916 | af_family_slock_key_strings[sk->sk_family], | |
917 | af_family_slock_keys + sk->sk_family, | |
918 | af_family_key_strings[sk->sk_family], | |
919 | af_family_keys + sk->sk_family); | |
a5b5bb9a IM |
920 | } |
921 | ||
f1a6c4da PE |
922 | static void sock_copy(struct sock *nsk, const struct sock *osk) |
923 | { | |
924 | #ifdef CONFIG_SECURITY_NETWORK | |
925 | void *sptr = nsk->sk_security; | |
926 | #endif | |
927 | ||
928 | memcpy(nsk, osk, osk->sk_prot->obj_size); | |
f1a6c4da PE |
929 | #ifdef CONFIG_SECURITY_NETWORK |
930 | nsk->sk_security = sptr; | |
931 | security_sk_clone(osk, nsk); | |
932 | #endif | |
933 | } | |
934 | ||
2e4afe7b PE |
935 | static struct sock *sk_prot_alloc(struct proto *prot, gfp_t priority, |
936 | int family) | |
c308c1b2 PE |
937 | { |
938 | struct sock *sk; | |
939 | struct kmem_cache *slab; | |
940 | ||
941 | slab = prot->slab; | |
942 | if (slab != NULL) | |
943 | sk = kmem_cache_alloc(slab, priority); | |
944 | else | |
945 | sk = kmalloc(prot->obj_size, priority); | |
946 | ||
2e4afe7b PE |
947 | if (sk != NULL) { |
948 | if (security_sk_alloc(sk, family, priority)) | |
949 | goto out_free; | |
950 | ||
951 | if (!try_module_get(prot->owner)) | |
952 | goto out_free_sec; | |
953 | } | |
954 | ||
c308c1b2 | 955 | return sk; |
2e4afe7b PE |
956 | |
957 | out_free_sec: | |
958 | security_sk_free(sk); | |
959 | out_free: | |
960 | if (slab != NULL) | |
961 | kmem_cache_free(slab, sk); | |
962 | else | |
963 | kfree(sk); | |
964 | return NULL; | |
c308c1b2 PE |
965 | } |
966 | ||
967 | static void sk_prot_free(struct proto *prot, struct sock *sk) | |
968 | { | |
969 | struct kmem_cache *slab; | |
2e4afe7b | 970 | struct module *owner; |
c308c1b2 | 971 | |
2e4afe7b | 972 | owner = prot->owner; |
c308c1b2 | 973 | slab = prot->slab; |
2e4afe7b PE |
974 | |
975 | security_sk_free(sk); | |
c308c1b2 PE |
976 | if (slab != NULL) |
977 | kmem_cache_free(slab, sk); | |
978 | else | |
979 | kfree(sk); | |
2e4afe7b | 980 | module_put(owner); |
c308c1b2 PE |
981 | } |
982 | ||
1da177e4 LT |
983 | /** |
984 | * sk_alloc - All socket objects are allocated here | |
c4ea43c5 | 985 | * @net: the applicable net namespace |
4dc3b16b PP |
986 | * @family: protocol family |
987 | * @priority: for allocation (%GFP_KERNEL, %GFP_ATOMIC, etc) | |
988 | * @prot: struct proto associated with this new sock instance | |
1da177e4 | 989 | */ |
1b8d7ae4 | 990 | struct sock *sk_alloc(struct net *net, int family, gfp_t priority, |
6257ff21 | 991 | struct proto *prot) |
1da177e4 | 992 | { |
c308c1b2 | 993 | struct sock *sk; |
1da177e4 | 994 | |
154adbc8 | 995 | sk = sk_prot_alloc(prot, priority | __GFP_ZERO, family); |
1da177e4 | 996 | if (sk) { |
154adbc8 PE |
997 | sk->sk_family = family; |
998 | /* | |
999 | * See comment in struct sock definition to understand | |
1000 | * why we need sk_prot_creator -acme | |
1001 | */ | |
1002 | sk->sk_prot = sk->sk_prot_creator = prot; | |
1003 | sock_lock_init(sk); | |
3b1e0a65 | 1004 | sock_net_set(sk, get_net(net)); |
1da177e4 | 1005 | } |
a79af59e | 1006 | |
2e4afe7b | 1007 | return sk; |
1da177e4 | 1008 | } |
2a91525c | 1009 | EXPORT_SYMBOL(sk_alloc); |
1da177e4 | 1010 | |
2b85a34e | 1011 | static void __sk_free(struct sock *sk) |
1da177e4 LT |
1012 | { |
1013 | struct sk_filter *filter; | |
1da177e4 LT |
1014 | |
1015 | if (sk->sk_destruct) | |
1016 | sk->sk_destruct(sk); | |
1017 | ||
fda9ef5d | 1018 | filter = rcu_dereference(sk->sk_filter); |
1da177e4 | 1019 | if (filter) { |
309dd5fc | 1020 | sk_filter_uncharge(sk, filter); |
fda9ef5d | 1021 | rcu_assign_pointer(sk->sk_filter, NULL); |
1da177e4 LT |
1022 | } |
1023 | ||
20d49473 PO |
1024 | sock_disable_timestamp(sk, SOCK_TIMESTAMP); |
1025 | sock_disable_timestamp(sk, SOCK_TIMESTAMPING_RX_SOFTWARE); | |
1da177e4 LT |
1026 | |
1027 | if (atomic_read(&sk->sk_omem_alloc)) | |
1028 | printk(KERN_DEBUG "%s: optmem leakage (%d bytes) detected.\n", | |
0dc47877 | 1029 | __func__, atomic_read(&sk->sk_omem_alloc)); |
1da177e4 | 1030 | |
3b1e0a65 | 1031 | put_net(sock_net(sk)); |
c308c1b2 | 1032 | sk_prot_free(sk->sk_prot_creator, sk); |
1da177e4 | 1033 | } |
2b85a34e ED |
1034 | |
1035 | void sk_free(struct sock *sk) | |
1036 | { | |
1037 | /* | |
1038 | * We substract one from sk_wmem_alloc and can know if | |
1039 | * some packets are still in some tx queue. | |
1040 | * If not null, sock_wfree() will call __sk_free(sk) later | |
1041 | */ | |
1042 | if (atomic_dec_and_test(&sk->sk_wmem_alloc)) | |
1043 | __sk_free(sk); | |
1044 | } | |
2a91525c | 1045 | EXPORT_SYMBOL(sk_free); |
1da177e4 | 1046 | |
edf02087 DL |
1047 | /* |
1048 | * Last sock_put should drop referrence to sk->sk_net. It has already | |
1049 | * been dropped in sk_change_net. Taking referrence to stopping namespace | |
1050 | * is not an option. | |
1051 | * Take referrence to a socket to remove it from hash _alive_ and after that | |
1052 | * destroy it in the context of init_net. | |
1053 | */ | |
1054 | void sk_release_kernel(struct sock *sk) | |
1055 | { | |
1056 | if (sk == NULL || sk->sk_socket == NULL) | |
1057 | return; | |
1058 | ||
1059 | sock_hold(sk); | |
1060 | sock_release(sk->sk_socket); | |
65a18ec5 | 1061 | release_net(sock_net(sk)); |
3b1e0a65 | 1062 | sock_net_set(sk, get_net(&init_net)); |
edf02087 DL |
1063 | sock_put(sk); |
1064 | } | |
45af1754 | 1065 | EXPORT_SYMBOL(sk_release_kernel); |
edf02087 | 1066 | |
dd0fc66f | 1067 | struct sock *sk_clone(const struct sock *sk, const gfp_t priority) |
87d11ceb | 1068 | { |
8fd1d178 | 1069 | struct sock *newsk; |
87d11ceb | 1070 | |
8fd1d178 | 1071 | newsk = sk_prot_alloc(sk->sk_prot, priority, sk->sk_family); |
87d11ceb ACM |
1072 | if (newsk != NULL) { |
1073 | struct sk_filter *filter; | |
1074 | ||
892c141e | 1075 | sock_copy(newsk, sk); |
87d11ceb ACM |
1076 | |
1077 | /* SANITY */ | |
3b1e0a65 | 1078 | get_net(sock_net(newsk)); |
87d11ceb ACM |
1079 | sk_node_init(&newsk->sk_node); |
1080 | sock_lock_init(newsk); | |
1081 | bh_lock_sock(newsk); | |
fa438ccf | 1082 | newsk->sk_backlog.head = newsk->sk_backlog.tail = NULL; |
87d11ceb ACM |
1083 | |
1084 | atomic_set(&newsk->sk_rmem_alloc, 0); | |
2b85a34e ED |
1085 | /* |
1086 | * sk_wmem_alloc set to one (see sk_free() and sock_wfree()) | |
1087 | */ | |
1088 | atomic_set(&newsk->sk_wmem_alloc, 1); | |
87d11ceb ACM |
1089 | atomic_set(&newsk->sk_omem_alloc, 0); |
1090 | skb_queue_head_init(&newsk->sk_receive_queue); | |
1091 | skb_queue_head_init(&newsk->sk_write_queue); | |
97fc2f08 CL |
1092 | #ifdef CONFIG_NET_DMA |
1093 | skb_queue_head_init(&newsk->sk_async_wait_queue); | |
1094 | #endif | |
87d11ceb ACM |
1095 | |
1096 | rwlock_init(&newsk->sk_dst_lock); | |
1097 | rwlock_init(&newsk->sk_callback_lock); | |
443aef0e PZ |
1098 | lockdep_set_class_and_name(&newsk->sk_callback_lock, |
1099 | af_callback_keys + newsk->sk_family, | |
1100 | af_family_clock_key_strings[newsk->sk_family]); | |
87d11ceb ACM |
1101 | |
1102 | newsk->sk_dst_cache = NULL; | |
1103 | newsk->sk_wmem_queued = 0; | |
1104 | newsk->sk_forward_alloc = 0; | |
1105 | newsk->sk_send_head = NULL; | |
87d11ceb ACM |
1106 | newsk->sk_userlocks = sk->sk_userlocks & ~SOCK_BINDPORT_LOCK; |
1107 | ||
1108 | sock_reset_flag(newsk, SOCK_DONE); | |
1109 | skb_queue_head_init(&newsk->sk_error_queue); | |
1110 | ||
1111 | filter = newsk->sk_filter; | |
1112 | if (filter != NULL) | |
1113 | sk_filter_charge(newsk, filter); | |
1114 | ||
1115 | if (unlikely(xfrm_sk_clone_policy(newsk))) { | |
1116 | /* It is still raw copy of parent, so invalidate | |
1117 | * destructor and make plain sk_free() */ | |
1118 | newsk->sk_destruct = NULL; | |
1119 | sk_free(newsk); | |
1120 | newsk = NULL; | |
1121 | goto out; | |
1122 | } | |
1123 | ||
1124 | newsk->sk_err = 0; | |
1125 | newsk->sk_priority = 0; | |
1126 | atomic_set(&newsk->sk_refcnt, 2); | |
1127 | ||
1128 | /* | |
1129 | * Increment the counter in the same struct proto as the master | |
1130 | * sock (sk_refcnt_debug_inc uses newsk->sk_prot->socks, that | |
1131 | * is the same as sk->sk_prot->socks, as this field was copied | |
1132 | * with memcpy). | |
1133 | * | |
1134 | * This _changes_ the previous behaviour, where | |
1135 | * tcp_create_openreq_child always was incrementing the | |
1136 | * equivalent to tcp_prot->socks (inet_sock_nr), so this have | |
1137 | * to be taken into account in all callers. -acme | |
1138 | */ | |
1139 | sk_refcnt_debug_inc(newsk); | |
972692e0 | 1140 | sk_set_socket(newsk, NULL); |
87d11ceb ACM |
1141 | newsk->sk_sleep = NULL; |
1142 | ||
1143 | if (newsk->sk_prot->sockets_allocated) | |
1748376b | 1144 | percpu_counter_inc(newsk->sk_prot->sockets_allocated); |
87d11ceb ACM |
1145 | } |
1146 | out: | |
1147 | return newsk; | |
1148 | } | |
87d11ceb ACM |
1149 | EXPORT_SYMBOL_GPL(sk_clone); |
1150 | ||
9958089a AK |
1151 | void sk_setup_caps(struct sock *sk, struct dst_entry *dst) |
1152 | { | |
1153 | __sk_dst_set(sk, dst); | |
1154 | sk->sk_route_caps = dst->dev->features; | |
1155 | if (sk->sk_route_caps & NETIF_F_GSO) | |
4fcd6b99 | 1156 | sk->sk_route_caps |= NETIF_F_GSO_SOFTWARE; |
9958089a | 1157 | if (sk_can_gso(sk)) { |
82cc1a7a | 1158 | if (dst->header_len) { |
9958089a | 1159 | sk->sk_route_caps &= ~NETIF_F_GSO_MASK; |
82cc1a7a | 1160 | } else { |
9958089a | 1161 | sk->sk_route_caps |= NETIF_F_SG | NETIF_F_HW_CSUM; |
82cc1a7a PWJ |
1162 | sk->sk_gso_max_size = dst->dev->gso_max_size; |
1163 | } | |
9958089a AK |
1164 | } |
1165 | } | |
1166 | EXPORT_SYMBOL_GPL(sk_setup_caps); | |
1167 | ||
1da177e4 LT |
1168 | void __init sk_init(void) |
1169 | { | |
1170 | if (num_physpages <= 4096) { | |
1171 | sysctl_wmem_max = 32767; | |
1172 | sysctl_rmem_max = 32767; | |
1173 | sysctl_wmem_default = 32767; | |
1174 | sysctl_rmem_default = 32767; | |
1175 | } else if (num_physpages >= 131072) { | |
1176 | sysctl_wmem_max = 131071; | |
1177 | sysctl_rmem_max = 131071; | |
1178 | } | |
1179 | } | |
1180 | ||
1181 | /* | |
1182 | * Simple resource managers for sockets. | |
1183 | */ | |
1184 | ||
1185 | ||
4ec93edb YH |
1186 | /* |
1187 | * Write buffer destructor automatically called from kfree_skb. | |
1da177e4 LT |
1188 | */ |
1189 | void sock_wfree(struct sk_buff *skb) | |
1190 | { | |
1191 | struct sock *sk = skb->sk; | |
2b85a34e | 1192 | int res; |
1da177e4 LT |
1193 | |
1194 | /* In case it might be waiting for more memory. */ | |
2b85a34e | 1195 | res = atomic_sub_return(skb->truesize, &sk->sk_wmem_alloc); |
1da177e4 LT |
1196 | if (!sock_flag(sk, SOCK_USE_WRITE_QUEUE)) |
1197 | sk->sk_write_space(sk); | |
2b85a34e ED |
1198 | /* |
1199 | * if sk_wmem_alloc reached 0, we are last user and should | |
1200 | * free this sock, as sk_free() call could not do it. | |
1201 | */ | |
1202 | if (res == 0) | |
1203 | __sk_free(sk); | |
1da177e4 | 1204 | } |
2a91525c | 1205 | EXPORT_SYMBOL(sock_wfree); |
1da177e4 | 1206 | |
4ec93edb YH |
1207 | /* |
1208 | * Read buffer destructor automatically called from kfree_skb. | |
1da177e4 LT |
1209 | */ |
1210 | void sock_rfree(struct sk_buff *skb) | |
1211 | { | |
1212 | struct sock *sk = skb->sk; | |
1213 | ||
1214 | atomic_sub(skb->truesize, &sk->sk_rmem_alloc); | |
3ab224be | 1215 | sk_mem_uncharge(skb->sk, skb->truesize); |
1da177e4 | 1216 | } |
2a91525c | 1217 | EXPORT_SYMBOL(sock_rfree); |
1da177e4 LT |
1218 | |
1219 | ||
1220 | int sock_i_uid(struct sock *sk) | |
1221 | { | |
1222 | int uid; | |
1223 | ||
1224 | read_lock(&sk->sk_callback_lock); | |
1225 | uid = sk->sk_socket ? SOCK_INODE(sk->sk_socket)->i_uid : 0; | |
1226 | read_unlock(&sk->sk_callback_lock); | |
1227 | return uid; | |
1228 | } | |
2a91525c | 1229 | EXPORT_SYMBOL(sock_i_uid); |
1da177e4 LT |
1230 | |
1231 | unsigned long sock_i_ino(struct sock *sk) | |
1232 | { | |
1233 | unsigned long ino; | |
1234 | ||
1235 | read_lock(&sk->sk_callback_lock); | |
1236 | ino = sk->sk_socket ? SOCK_INODE(sk->sk_socket)->i_ino : 0; | |
1237 | read_unlock(&sk->sk_callback_lock); | |
1238 | return ino; | |
1239 | } | |
2a91525c | 1240 | EXPORT_SYMBOL(sock_i_ino); |
1da177e4 LT |
1241 | |
1242 | /* | |
1243 | * Allocate a skb from the socket's send buffer. | |
1244 | */ | |
86a76caf | 1245 | struct sk_buff *sock_wmalloc(struct sock *sk, unsigned long size, int force, |
dd0fc66f | 1246 | gfp_t priority) |
1da177e4 LT |
1247 | { |
1248 | if (force || atomic_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf) { | |
2a91525c | 1249 | struct sk_buff *skb = alloc_skb(size, priority); |
1da177e4 LT |
1250 | if (skb) { |
1251 | skb_set_owner_w(skb, sk); | |
1252 | return skb; | |
1253 | } | |
1254 | } | |
1255 | return NULL; | |
1256 | } | |
2a91525c | 1257 | EXPORT_SYMBOL(sock_wmalloc); |
1da177e4 LT |
1258 | |
1259 | /* | |
1260 | * Allocate a skb from the socket's receive buffer. | |
4ec93edb | 1261 | */ |
86a76caf | 1262 | struct sk_buff *sock_rmalloc(struct sock *sk, unsigned long size, int force, |
dd0fc66f | 1263 | gfp_t priority) |
1da177e4 LT |
1264 | { |
1265 | if (force || atomic_read(&sk->sk_rmem_alloc) < sk->sk_rcvbuf) { | |
1266 | struct sk_buff *skb = alloc_skb(size, priority); | |
1267 | if (skb) { | |
1268 | skb_set_owner_r(skb, sk); | |
1269 | return skb; | |
1270 | } | |
1271 | } | |
1272 | return NULL; | |
1273 | } | |
1274 | ||
4ec93edb | 1275 | /* |
1da177e4 | 1276 | * Allocate a memory block from the socket's option memory buffer. |
4ec93edb | 1277 | */ |
dd0fc66f | 1278 | void *sock_kmalloc(struct sock *sk, int size, gfp_t priority) |
1da177e4 LT |
1279 | { |
1280 | if ((unsigned)size <= sysctl_optmem_max && | |
1281 | atomic_read(&sk->sk_omem_alloc) + size < sysctl_optmem_max) { | |
1282 | void *mem; | |
1283 | /* First do the add, to avoid the race if kmalloc | |
4ec93edb | 1284 | * might sleep. |
1da177e4 LT |
1285 | */ |
1286 | atomic_add(size, &sk->sk_omem_alloc); | |
1287 | mem = kmalloc(size, priority); | |
1288 | if (mem) | |
1289 | return mem; | |
1290 | atomic_sub(size, &sk->sk_omem_alloc); | |
1291 | } | |
1292 | return NULL; | |
1293 | } | |
2a91525c | 1294 | EXPORT_SYMBOL(sock_kmalloc); |
1da177e4 LT |
1295 | |
1296 | /* | |
1297 | * Free an option memory block. | |
1298 | */ | |
1299 | void sock_kfree_s(struct sock *sk, void *mem, int size) | |
1300 | { | |
1301 | kfree(mem); | |
1302 | atomic_sub(size, &sk->sk_omem_alloc); | |
1303 | } | |
2a91525c | 1304 | EXPORT_SYMBOL(sock_kfree_s); |
1da177e4 LT |
1305 | |
1306 | /* It is almost wait_for_tcp_memory minus release_sock/lock_sock. | |
1307 | I think, these locks should be removed for datagram sockets. | |
1308 | */ | |
2a91525c | 1309 | static long sock_wait_for_wmem(struct sock *sk, long timeo) |
1da177e4 LT |
1310 | { |
1311 | DEFINE_WAIT(wait); | |
1312 | ||
1313 | clear_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags); | |
1314 | for (;;) { | |
1315 | if (!timeo) | |
1316 | break; | |
1317 | if (signal_pending(current)) | |
1318 | break; | |
1319 | set_bit(SOCK_NOSPACE, &sk->sk_socket->flags); | |
1320 | prepare_to_wait(sk->sk_sleep, &wait, TASK_INTERRUPTIBLE); | |
1321 | if (atomic_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf) | |
1322 | break; | |
1323 | if (sk->sk_shutdown & SEND_SHUTDOWN) | |
1324 | break; | |
1325 | if (sk->sk_err) | |
1326 | break; | |
1327 | timeo = schedule_timeout(timeo); | |
1328 | } | |
1329 | finish_wait(sk->sk_sleep, &wait); | |
1330 | return timeo; | |
1331 | } | |
1332 | ||
1333 | ||
1334 | /* | |
1335 | * Generic send/receive buffer handlers | |
1336 | */ | |
1337 | ||
4cc7f68d HX |
1338 | struct sk_buff *sock_alloc_send_pskb(struct sock *sk, unsigned long header_len, |
1339 | unsigned long data_len, int noblock, | |
1340 | int *errcode) | |
1da177e4 LT |
1341 | { |
1342 | struct sk_buff *skb; | |
7d877f3b | 1343 | gfp_t gfp_mask; |
1da177e4 LT |
1344 | long timeo; |
1345 | int err; | |
1346 | ||
1347 | gfp_mask = sk->sk_allocation; | |
1348 | if (gfp_mask & __GFP_WAIT) | |
1349 | gfp_mask |= __GFP_REPEAT; | |
1350 | ||
1351 | timeo = sock_sndtimeo(sk, noblock); | |
1352 | while (1) { | |
1353 | err = sock_error(sk); | |
1354 | if (err != 0) | |
1355 | goto failure; | |
1356 | ||
1357 | err = -EPIPE; | |
1358 | if (sk->sk_shutdown & SEND_SHUTDOWN) | |
1359 | goto failure; | |
1360 | ||
1361 | if (atomic_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf) { | |
db38c179 | 1362 | skb = alloc_skb(header_len, gfp_mask); |
1da177e4 LT |
1363 | if (skb) { |
1364 | int npages; | |
1365 | int i; | |
1366 | ||
1367 | /* No pages, we're done... */ | |
1368 | if (!data_len) | |
1369 | break; | |
1370 | ||
1371 | npages = (data_len + (PAGE_SIZE - 1)) >> PAGE_SHIFT; | |
1372 | skb->truesize += data_len; | |
1373 | skb_shinfo(skb)->nr_frags = npages; | |
1374 | for (i = 0; i < npages; i++) { | |
1375 | struct page *page; | |
1376 | skb_frag_t *frag; | |
1377 | ||
1378 | page = alloc_pages(sk->sk_allocation, 0); | |
1379 | if (!page) { | |
1380 | err = -ENOBUFS; | |
1381 | skb_shinfo(skb)->nr_frags = i; | |
1382 | kfree_skb(skb); | |
1383 | goto failure; | |
1384 | } | |
1385 | ||
1386 | frag = &skb_shinfo(skb)->frags[i]; | |
1387 | frag->page = page; | |
1388 | frag->page_offset = 0; | |
1389 | frag->size = (data_len >= PAGE_SIZE ? | |
1390 | PAGE_SIZE : | |
1391 | data_len); | |
1392 | data_len -= PAGE_SIZE; | |
1393 | } | |
1394 | ||
1395 | /* Full success... */ | |
1396 | break; | |
1397 | } | |
1398 | err = -ENOBUFS; | |
1399 | goto failure; | |
1400 | } | |
1401 | set_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags); | |
1402 | set_bit(SOCK_NOSPACE, &sk->sk_socket->flags); | |
1403 | err = -EAGAIN; | |
1404 | if (!timeo) | |
1405 | goto failure; | |
1406 | if (signal_pending(current)) | |
1407 | goto interrupted; | |
1408 | timeo = sock_wait_for_wmem(sk, timeo); | |
1409 | } | |
1410 | ||
1411 | skb_set_owner_w(skb, sk); | |
1412 | return skb; | |
1413 | ||
1414 | interrupted: | |
1415 | err = sock_intr_errno(timeo); | |
1416 | failure: | |
1417 | *errcode = err; | |
1418 | return NULL; | |
1419 | } | |
4cc7f68d | 1420 | EXPORT_SYMBOL(sock_alloc_send_pskb); |
1da177e4 | 1421 | |
4ec93edb | 1422 | struct sk_buff *sock_alloc_send_skb(struct sock *sk, unsigned long size, |
1da177e4 LT |
1423 | int noblock, int *errcode) |
1424 | { | |
1425 | return sock_alloc_send_pskb(sk, size, 0, noblock, errcode); | |
1426 | } | |
2a91525c | 1427 | EXPORT_SYMBOL(sock_alloc_send_skb); |
1da177e4 LT |
1428 | |
1429 | static void __lock_sock(struct sock *sk) | |
1430 | { | |
1431 | DEFINE_WAIT(wait); | |
1432 | ||
e71a4783 | 1433 | for (;;) { |
1da177e4 LT |
1434 | prepare_to_wait_exclusive(&sk->sk_lock.wq, &wait, |
1435 | TASK_UNINTERRUPTIBLE); | |
1436 | spin_unlock_bh(&sk->sk_lock.slock); | |
1437 | schedule(); | |
1438 | spin_lock_bh(&sk->sk_lock.slock); | |
e71a4783 | 1439 | if (!sock_owned_by_user(sk)) |
1da177e4 LT |
1440 | break; |
1441 | } | |
1442 | finish_wait(&sk->sk_lock.wq, &wait); | |
1443 | } | |
1444 | ||
1445 | static void __release_sock(struct sock *sk) | |
1446 | { | |
1447 | struct sk_buff *skb = sk->sk_backlog.head; | |
1448 | ||
1449 | do { | |
1450 | sk->sk_backlog.head = sk->sk_backlog.tail = NULL; | |
1451 | bh_unlock_sock(sk); | |
1452 | ||
1453 | do { | |
1454 | struct sk_buff *next = skb->next; | |
1455 | ||
1456 | skb->next = NULL; | |
c57943a1 | 1457 | sk_backlog_rcv(sk, skb); |
1da177e4 LT |
1458 | |
1459 | /* | |
1460 | * We are in process context here with softirqs | |
1461 | * disabled, use cond_resched_softirq() to preempt. | |
1462 | * This is safe to do because we've taken the backlog | |
1463 | * queue private: | |
1464 | */ | |
1465 | cond_resched_softirq(); | |
1466 | ||
1467 | skb = next; | |
1468 | } while (skb != NULL); | |
1469 | ||
1470 | bh_lock_sock(sk); | |
e71a4783 | 1471 | } while ((skb = sk->sk_backlog.head) != NULL); |
1da177e4 LT |
1472 | } |
1473 | ||
1474 | /** | |
1475 | * sk_wait_data - wait for data to arrive at sk_receive_queue | |
4dc3b16b PP |
1476 | * @sk: sock to wait on |
1477 | * @timeo: for how long | |
1da177e4 LT |
1478 | * |
1479 | * Now socket state including sk->sk_err is changed only under lock, | |
1480 | * hence we may omit checks after joining wait queue. | |
1481 | * We check receive queue before schedule() only as optimization; | |
1482 | * it is very likely that release_sock() added new data. | |
1483 | */ | |
1484 | int sk_wait_data(struct sock *sk, long *timeo) | |
1485 | { | |
1486 | int rc; | |
1487 | DEFINE_WAIT(wait); | |
1488 | ||
1489 | prepare_to_wait(sk->sk_sleep, &wait, TASK_INTERRUPTIBLE); | |
1490 | set_bit(SOCK_ASYNC_WAITDATA, &sk->sk_socket->flags); | |
1491 | rc = sk_wait_event(sk, timeo, !skb_queue_empty(&sk->sk_receive_queue)); | |
1492 | clear_bit(SOCK_ASYNC_WAITDATA, &sk->sk_socket->flags); | |
1493 | finish_wait(sk->sk_sleep, &wait); | |
1494 | return rc; | |
1495 | } | |
1da177e4 LT |
1496 | EXPORT_SYMBOL(sk_wait_data); |
1497 | ||
3ab224be HA |
1498 | /** |
1499 | * __sk_mem_schedule - increase sk_forward_alloc and memory_allocated | |
1500 | * @sk: socket | |
1501 | * @size: memory size to allocate | |
1502 | * @kind: allocation type | |
1503 | * | |
1504 | * If kind is SK_MEM_SEND, it means wmem allocation. Otherwise it means | |
1505 | * rmem allocation. This function assumes that protocols which have | |
1506 | * memory_pressure use sk_wmem_queued as write buffer accounting. | |
1507 | */ | |
1508 | int __sk_mem_schedule(struct sock *sk, int size, int kind) | |
1509 | { | |
1510 | struct proto *prot = sk->sk_prot; | |
1511 | int amt = sk_mem_pages(size); | |
1512 | int allocated; | |
1513 | ||
1514 | sk->sk_forward_alloc += amt * SK_MEM_QUANTUM; | |
1515 | allocated = atomic_add_return(amt, prot->memory_allocated); | |
1516 | ||
1517 | /* Under limit. */ | |
1518 | if (allocated <= prot->sysctl_mem[0]) { | |
1519 | if (prot->memory_pressure && *prot->memory_pressure) | |
1520 | *prot->memory_pressure = 0; | |
1521 | return 1; | |
1522 | } | |
1523 | ||
1524 | /* Under pressure. */ | |
1525 | if (allocated > prot->sysctl_mem[1]) | |
1526 | if (prot->enter_memory_pressure) | |
5c52ba17 | 1527 | prot->enter_memory_pressure(sk); |
3ab224be HA |
1528 | |
1529 | /* Over hard limit. */ | |
1530 | if (allocated > prot->sysctl_mem[2]) | |
1531 | goto suppress_allocation; | |
1532 | ||
1533 | /* guarantee minimum buffer size under pressure */ | |
1534 | if (kind == SK_MEM_RECV) { | |
1535 | if (atomic_read(&sk->sk_rmem_alloc) < prot->sysctl_rmem[0]) | |
1536 | return 1; | |
1537 | } else { /* SK_MEM_SEND */ | |
1538 | if (sk->sk_type == SOCK_STREAM) { | |
1539 | if (sk->sk_wmem_queued < prot->sysctl_wmem[0]) | |
1540 | return 1; | |
1541 | } else if (atomic_read(&sk->sk_wmem_alloc) < | |
1542 | prot->sysctl_wmem[0]) | |
1543 | return 1; | |
1544 | } | |
1545 | ||
1546 | if (prot->memory_pressure) { | |
1748376b ED |
1547 | int alloc; |
1548 | ||
1549 | if (!*prot->memory_pressure) | |
1550 | return 1; | |
1551 | alloc = percpu_counter_read_positive(prot->sockets_allocated); | |
1552 | if (prot->sysctl_mem[2] > alloc * | |
3ab224be HA |
1553 | sk_mem_pages(sk->sk_wmem_queued + |
1554 | atomic_read(&sk->sk_rmem_alloc) + | |
1555 | sk->sk_forward_alloc)) | |
1556 | return 1; | |
1557 | } | |
1558 | ||
1559 | suppress_allocation: | |
1560 | ||
1561 | if (kind == SK_MEM_SEND && sk->sk_type == SOCK_STREAM) { | |
1562 | sk_stream_moderate_sndbuf(sk); | |
1563 | ||
1564 | /* Fail only if socket is _under_ its sndbuf. | |
1565 | * In this case we cannot block, so that we have to fail. | |
1566 | */ | |
1567 | if (sk->sk_wmem_queued + size >= sk->sk_sndbuf) | |
1568 | return 1; | |
1569 | } | |
1570 | ||
1571 | /* Alas. Undo changes. */ | |
1572 | sk->sk_forward_alloc -= amt * SK_MEM_QUANTUM; | |
1573 | atomic_sub(amt, prot->memory_allocated); | |
1574 | return 0; | |
1575 | } | |
3ab224be HA |
1576 | EXPORT_SYMBOL(__sk_mem_schedule); |
1577 | ||
1578 | /** | |
1579 | * __sk_reclaim - reclaim memory_allocated | |
1580 | * @sk: socket | |
1581 | */ | |
1582 | void __sk_mem_reclaim(struct sock *sk) | |
1583 | { | |
1584 | struct proto *prot = sk->sk_prot; | |
1585 | ||
680a5a50 | 1586 | atomic_sub(sk->sk_forward_alloc >> SK_MEM_QUANTUM_SHIFT, |
3ab224be HA |
1587 | prot->memory_allocated); |
1588 | sk->sk_forward_alloc &= SK_MEM_QUANTUM - 1; | |
1589 | ||
1590 | if (prot->memory_pressure && *prot->memory_pressure && | |
1591 | (atomic_read(prot->memory_allocated) < prot->sysctl_mem[0])) | |
1592 | *prot->memory_pressure = 0; | |
1593 | } | |
3ab224be HA |
1594 | EXPORT_SYMBOL(__sk_mem_reclaim); |
1595 | ||
1596 | ||
1da177e4 LT |
1597 | /* |
1598 | * Set of default routines for initialising struct proto_ops when | |
1599 | * the protocol does not support a particular function. In certain | |
1600 | * cases where it makes no sense for a protocol to have a "do nothing" | |
1601 | * function, some default processing is provided. | |
1602 | */ | |
1603 | ||
1604 | int sock_no_bind(struct socket *sock, struct sockaddr *saddr, int len) | |
1605 | { | |
1606 | return -EOPNOTSUPP; | |
1607 | } | |
2a91525c | 1608 | EXPORT_SYMBOL(sock_no_bind); |
1da177e4 | 1609 | |
4ec93edb | 1610 | int sock_no_connect(struct socket *sock, struct sockaddr *saddr, |
1da177e4 LT |
1611 | int len, int flags) |
1612 | { | |
1613 | return -EOPNOTSUPP; | |
1614 | } | |
2a91525c | 1615 | EXPORT_SYMBOL(sock_no_connect); |
1da177e4 LT |
1616 | |
1617 | int sock_no_socketpair(struct socket *sock1, struct socket *sock2) | |
1618 | { | |
1619 | return -EOPNOTSUPP; | |
1620 | } | |
2a91525c | 1621 | EXPORT_SYMBOL(sock_no_socketpair); |
1da177e4 LT |
1622 | |
1623 | int sock_no_accept(struct socket *sock, struct socket *newsock, int flags) | |
1624 | { | |
1625 | return -EOPNOTSUPP; | |
1626 | } | |
2a91525c | 1627 | EXPORT_SYMBOL(sock_no_accept); |
1da177e4 | 1628 | |
4ec93edb | 1629 | int sock_no_getname(struct socket *sock, struct sockaddr *saddr, |
1da177e4 LT |
1630 | int *len, int peer) |
1631 | { | |
1632 | return -EOPNOTSUPP; | |
1633 | } | |
2a91525c | 1634 | EXPORT_SYMBOL(sock_no_getname); |
1da177e4 | 1635 | |
2a91525c | 1636 | unsigned int sock_no_poll(struct file *file, struct socket *sock, poll_table *pt) |
1da177e4 LT |
1637 | { |
1638 | return 0; | |
1639 | } | |
2a91525c | 1640 | EXPORT_SYMBOL(sock_no_poll); |
1da177e4 LT |
1641 | |
1642 | int sock_no_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg) | |
1643 | { | |
1644 | return -EOPNOTSUPP; | |
1645 | } | |
2a91525c | 1646 | EXPORT_SYMBOL(sock_no_ioctl); |
1da177e4 LT |
1647 | |
1648 | int sock_no_listen(struct socket *sock, int backlog) | |
1649 | { | |
1650 | return -EOPNOTSUPP; | |
1651 | } | |
2a91525c | 1652 | EXPORT_SYMBOL(sock_no_listen); |
1da177e4 LT |
1653 | |
1654 | int sock_no_shutdown(struct socket *sock, int how) | |
1655 | { | |
1656 | return -EOPNOTSUPP; | |
1657 | } | |
2a91525c | 1658 | EXPORT_SYMBOL(sock_no_shutdown); |
1da177e4 LT |
1659 | |
1660 | int sock_no_setsockopt(struct socket *sock, int level, int optname, | |
1661 | char __user *optval, int optlen) | |
1662 | { | |
1663 | return -EOPNOTSUPP; | |
1664 | } | |
2a91525c | 1665 | EXPORT_SYMBOL(sock_no_setsockopt); |
1da177e4 LT |
1666 | |
1667 | int sock_no_getsockopt(struct socket *sock, int level, int optname, | |
1668 | char __user *optval, int __user *optlen) | |
1669 | { | |
1670 | return -EOPNOTSUPP; | |
1671 | } | |
2a91525c | 1672 | EXPORT_SYMBOL(sock_no_getsockopt); |
1da177e4 LT |
1673 | |
1674 | int sock_no_sendmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *m, | |
1675 | size_t len) | |
1676 | { | |
1677 | return -EOPNOTSUPP; | |
1678 | } | |
2a91525c | 1679 | EXPORT_SYMBOL(sock_no_sendmsg); |
1da177e4 LT |
1680 | |
1681 | int sock_no_recvmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *m, | |
1682 | size_t len, int flags) | |
1683 | { | |
1684 | return -EOPNOTSUPP; | |
1685 | } | |
2a91525c | 1686 | EXPORT_SYMBOL(sock_no_recvmsg); |
1da177e4 LT |
1687 | |
1688 | int sock_no_mmap(struct file *file, struct socket *sock, struct vm_area_struct *vma) | |
1689 | { | |
1690 | /* Mirror missing mmap method error code */ | |
1691 | return -ENODEV; | |
1692 | } | |
2a91525c | 1693 | EXPORT_SYMBOL(sock_no_mmap); |
1da177e4 LT |
1694 | |
1695 | ssize_t sock_no_sendpage(struct socket *sock, struct page *page, int offset, size_t size, int flags) | |
1696 | { | |
1697 | ssize_t res; | |
1698 | struct msghdr msg = {.msg_flags = flags}; | |
1699 | struct kvec iov; | |
1700 | char *kaddr = kmap(page); | |
1701 | iov.iov_base = kaddr + offset; | |
1702 | iov.iov_len = size; | |
1703 | res = kernel_sendmsg(sock, &msg, &iov, 1, size); | |
1704 | kunmap(page); | |
1705 | return res; | |
1706 | } | |
2a91525c | 1707 | EXPORT_SYMBOL(sock_no_sendpage); |
1da177e4 LT |
1708 | |
1709 | /* | |
1710 | * Default Socket Callbacks | |
1711 | */ | |
1712 | ||
1713 | static void sock_def_wakeup(struct sock *sk) | |
1714 | { | |
1715 | read_lock(&sk->sk_callback_lock); | |
1716 | if (sk->sk_sleep && waitqueue_active(sk->sk_sleep)) | |
1717 | wake_up_interruptible_all(sk->sk_sleep); | |
1718 | read_unlock(&sk->sk_callback_lock); | |
1719 | } | |
1720 | ||
1721 | static void sock_def_error_report(struct sock *sk) | |
1722 | { | |
1723 | read_lock(&sk->sk_callback_lock); | |
1724 | if (sk->sk_sleep && waitqueue_active(sk->sk_sleep)) | |
37e5540b | 1725 | wake_up_interruptible_poll(sk->sk_sleep, POLLERR); |
8d8ad9d7 | 1726 | sk_wake_async(sk, SOCK_WAKE_IO, POLL_ERR); |
1da177e4 LT |
1727 | read_unlock(&sk->sk_callback_lock); |
1728 | } | |
1729 | ||
1730 | static void sock_def_readable(struct sock *sk, int len) | |
1731 | { | |
1732 | read_lock(&sk->sk_callback_lock); | |
1733 | if (sk->sk_sleep && waitqueue_active(sk->sk_sleep)) | |
37e5540b DL |
1734 | wake_up_interruptible_sync_poll(sk->sk_sleep, POLLIN | |
1735 | POLLRDNORM | POLLRDBAND); | |
8d8ad9d7 | 1736 | sk_wake_async(sk, SOCK_WAKE_WAITD, POLL_IN); |
1da177e4 LT |
1737 | read_unlock(&sk->sk_callback_lock); |
1738 | } | |
1739 | ||
1740 | static void sock_def_write_space(struct sock *sk) | |
1741 | { | |
1742 | read_lock(&sk->sk_callback_lock); | |
1743 | ||
1744 | /* Do not wake up a writer until he can make "significant" | |
1745 | * progress. --DaveM | |
1746 | */ | |
e71a4783 | 1747 | if ((atomic_read(&sk->sk_wmem_alloc) << 1) <= sk->sk_sndbuf) { |
1da177e4 | 1748 | if (sk->sk_sleep && waitqueue_active(sk->sk_sleep)) |
37e5540b DL |
1749 | wake_up_interruptible_sync_poll(sk->sk_sleep, POLLOUT | |
1750 | POLLWRNORM | POLLWRBAND); | |
1da177e4 LT |
1751 | |
1752 | /* Should agree with poll, otherwise some programs break */ | |
1753 | if (sock_writeable(sk)) | |
8d8ad9d7 | 1754 | sk_wake_async(sk, SOCK_WAKE_SPACE, POLL_OUT); |
1da177e4 LT |
1755 | } |
1756 | ||
1757 | read_unlock(&sk->sk_callback_lock); | |
1758 | } | |
1759 | ||
1760 | static void sock_def_destruct(struct sock *sk) | |
1761 | { | |
a51482bd | 1762 | kfree(sk->sk_protinfo); |
1da177e4 LT |
1763 | } |
1764 | ||
1765 | void sk_send_sigurg(struct sock *sk) | |
1766 | { | |
1767 | if (sk->sk_socket && sk->sk_socket->file) | |
1768 | if (send_sigurg(&sk->sk_socket->file->f_owner)) | |
8d8ad9d7 | 1769 | sk_wake_async(sk, SOCK_WAKE_URG, POLL_PRI); |
1da177e4 | 1770 | } |
2a91525c | 1771 | EXPORT_SYMBOL(sk_send_sigurg); |
1da177e4 LT |
1772 | |
1773 | void sk_reset_timer(struct sock *sk, struct timer_list* timer, | |
1774 | unsigned long expires) | |
1775 | { | |
1776 | if (!mod_timer(timer, expires)) | |
1777 | sock_hold(sk); | |
1778 | } | |
1da177e4 LT |
1779 | EXPORT_SYMBOL(sk_reset_timer); |
1780 | ||
1781 | void sk_stop_timer(struct sock *sk, struct timer_list* timer) | |
1782 | { | |
1783 | if (timer_pending(timer) && del_timer(timer)) | |
1784 | __sock_put(sk); | |
1785 | } | |
1da177e4 LT |
1786 | EXPORT_SYMBOL(sk_stop_timer); |
1787 | ||
1788 | void sock_init_data(struct socket *sock, struct sock *sk) | |
1789 | { | |
1790 | skb_queue_head_init(&sk->sk_receive_queue); | |
1791 | skb_queue_head_init(&sk->sk_write_queue); | |
1792 | skb_queue_head_init(&sk->sk_error_queue); | |
97fc2f08 CL |
1793 | #ifdef CONFIG_NET_DMA |
1794 | skb_queue_head_init(&sk->sk_async_wait_queue); | |
1795 | #endif | |
1da177e4 LT |
1796 | |
1797 | sk->sk_send_head = NULL; | |
1798 | ||
1799 | init_timer(&sk->sk_timer); | |
4ec93edb | 1800 | |
1da177e4 LT |
1801 | sk->sk_allocation = GFP_KERNEL; |
1802 | sk->sk_rcvbuf = sysctl_rmem_default; | |
1803 | sk->sk_sndbuf = sysctl_wmem_default; | |
1804 | sk->sk_state = TCP_CLOSE; | |
972692e0 | 1805 | sk_set_socket(sk, sock); |
1da177e4 LT |
1806 | |
1807 | sock_set_flag(sk, SOCK_ZAPPED); | |
1808 | ||
e71a4783 | 1809 | if (sock) { |
1da177e4 LT |
1810 | sk->sk_type = sock->type; |
1811 | sk->sk_sleep = &sock->wait; | |
1812 | sock->sk = sk; | |
1813 | } else | |
1814 | sk->sk_sleep = NULL; | |
1815 | ||
1816 | rwlock_init(&sk->sk_dst_lock); | |
1817 | rwlock_init(&sk->sk_callback_lock); | |
443aef0e PZ |
1818 | lockdep_set_class_and_name(&sk->sk_callback_lock, |
1819 | af_callback_keys + sk->sk_family, | |
1820 | af_family_clock_key_strings[sk->sk_family]); | |
1da177e4 LT |
1821 | |
1822 | sk->sk_state_change = sock_def_wakeup; | |
1823 | sk->sk_data_ready = sock_def_readable; | |
1824 | sk->sk_write_space = sock_def_write_space; | |
1825 | sk->sk_error_report = sock_def_error_report; | |
1826 | sk->sk_destruct = sock_def_destruct; | |
1827 | ||
1828 | sk->sk_sndmsg_page = NULL; | |
1829 | sk->sk_sndmsg_off = 0; | |
1830 | ||
1831 | sk->sk_peercred.pid = 0; | |
1832 | sk->sk_peercred.uid = -1; | |
1833 | sk->sk_peercred.gid = -1; | |
1834 | sk->sk_write_pending = 0; | |
1835 | sk->sk_rcvlowat = 1; | |
1836 | sk->sk_rcvtimeo = MAX_SCHEDULE_TIMEOUT; | |
1837 | sk->sk_sndtimeo = MAX_SCHEDULE_TIMEOUT; | |
1838 | ||
f37f0afb | 1839 | sk->sk_stamp = ktime_set(-1L, 0); |
1da177e4 LT |
1840 | |
1841 | atomic_set(&sk->sk_refcnt, 1); | |
2b85a34e | 1842 | atomic_set(&sk->sk_wmem_alloc, 1); |
33c732c3 | 1843 | atomic_set(&sk->sk_drops, 0); |
1da177e4 | 1844 | } |
2a91525c | 1845 | EXPORT_SYMBOL(sock_init_data); |
1da177e4 | 1846 | |
b5606c2d | 1847 | void lock_sock_nested(struct sock *sk, int subclass) |
1da177e4 LT |
1848 | { |
1849 | might_sleep(); | |
a5b5bb9a | 1850 | spin_lock_bh(&sk->sk_lock.slock); |
d2e9117c | 1851 | if (sk->sk_lock.owned) |
1da177e4 | 1852 | __lock_sock(sk); |
d2e9117c | 1853 | sk->sk_lock.owned = 1; |
a5b5bb9a IM |
1854 | spin_unlock(&sk->sk_lock.slock); |
1855 | /* | |
1856 | * The sk_lock has mutex_lock() semantics here: | |
1857 | */ | |
fcc70d5f | 1858 | mutex_acquire(&sk->sk_lock.dep_map, subclass, 0, _RET_IP_); |
a5b5bb9a | 1859 | local_bh_enable(); |
1da177e4 | 1860 | } |
fcc70d5f | 1861 | EXPORT_SYMBOL(lock_sock_nested); |
1da177e4 | 1862 | |
b5606c2d | 1863 | void release_sock(struct sock *sk) |
1da177e4 | 1864 | { |
a5b5bb9a IM |
1865 | /* |
1866 | * The sk_lock has mutex_unlock() semantics: | |
1867 | */ | |
1868 | mutex_release(&sk->sk_lock.dep_map, 1, _RET_IP_); | |
1869 | ||
1870 | spin_lock_bh(&sk->sk_lock.slock); | |
1da177e4 LT |
1871 | if (sk->sk_backlog.tail) |
1872 | __release_sock(sk); | |
d2e9117c | 1873 | sk->sk_lock.owned = 0; |
a5b5bb9a IM |
1874 | if (waitqueue_active(&sk->sk_lock.wq)) |
1875 | wake_up(&sk->sk_lock.wq); | |
1876 | spin_unlock_bh(&sk->sk_lock.slock); | |
1da177e4 LT |
1877 | } |
1878 | EXPORT_SYMBOL(release_sock); | |
1879 | ||
1880 | int sock_get_timestamp(struct sock *sk, struct timeval __user *userstamp) | |
4ec93edb | 1881 | { |
b7aa0bf7 | 1882 | struct timeval tv; |
1da177e4 | 1883 | if (!sock_flag(sk, SOCK_TIMESTAMP)) |
20d49473 | 1884 | sock_enable_timestamp(sk, SOCK_TIMESTAMP); |
b7aa0bf7 ED |
1885 | tv = ktime_to_timeval(sk->sk_stamp); |
1886 | if (tv.tv_sec == -1) | |
1da177e4 | 1887 | return -ENOENT; |
b7aa0bf7 ED |
1888 | if (tv.tv_sec == 0) { |
1889 | sk->sk_stamp = ktime_get_real(); | |
1890 | tv = ktime_to_timeval(sk->sk_stamp); | |
1891 | } | |
1892 | return copy_to_user(userstamp, &tv, sizeof(tv)) ? -EFAULT : 0; | |
4ec93edb | 1893 | } |
1da177e4 LT |
1894 | EXPORT_SYMBOL(sock_get_timestamp); |
1895 | ||
ae40eb1e ED |
1896 | int sock_get_timestampns(struct sock *sk, struct timespec __user *userstamp) |
1897 | { | |
1898 | struct timespec ts; | |
1899 | if (!sock_flag(sk, SOCK_TIMESTAMP)) | |
20d49473 | 1900 | sock_enable_timestamp(sk, SOCK_TIMESTAMP); |
ae40eb1e ED |
1901 | ts = ktime_to_timespec(sk->sk_stamp); |
1902 | if (ts.tv_sec == -1) | |
1903 | return -ENOENT; | |
1904 | if (ts.tv_sec == 0) { | |
1905 | sk->sk_stamp = ktime_get_real(); | |
1906 | ts = ktime_to_timespec(sk->sk_stamp); | |
1907 | } | |
1908 | return copy_to_user(userstamp, &ts, sizeof(ts)) ? -EFAULT : 0; | |
1909 | } | |
1910 | EXPORT_SYMBOL(sock_get_timestampns); | |
1911 | ||
20d49473 | 1912 | void sock_enable_timestamp(struct sock *sk, int flag) |
4ec93edb | 1913 | { |
20d49473 PO |
1914 | if (!sock_flag(sk, flag)) { |
1915 | sock_set_flag(sk, flag); | |
1916 | /* | |
1917 | * we just set one of the two flags which require net | |
1918 | * time stamping, but time stamping might have been on | |
1919 | * already because of the other one | |
1920 | */ | |
1921 | if (!sock_flag(sk, | |
1922 | flag == SOCK_TIMESTAMP ? | |
1923 | SOCK_TIMESTAMPING_RX_SOFTWARE : | |
1924 | SOCK_TIMESTAMP)) | |
1925 | net_enable_timestamp(); | |
1da177e4 LT |
1926 | } |
1927 | } | |
1da177e4 LT |
1928 | |
1929 | /* | |
1930 | * Get a socket option on an socket. | |
1931 | * | |
1932 | * FIX: POSIX 1003.1g is very ambiguous here. It states that | |
1933 | * asynchronous errors should be reported by getsockopt. We assume | |
1934 | * this means if you specify SO_ERROR (otherwise whats the point of it). | |
1935 | */ | |
1936 | int sock_common_getsockopt(struct socket *sock, int level, int optname, | |
1937 | char __user *optval, int __user *optlen) | |
1938 | { | |
1939 | struct sock *sk = sock->sk; | |
1940 | ||
1941 | return sk->sk_prot->getsockopt(sk, level, optname, optval, optlen); | |
1942 | } | |
1da177e4 LT |
1943 | EXPORT_SYMBOL(sock_common_getsockopt); |
1944 | ||
3fdadf7d | 1945 | #ifdef CONFIG_COMPAT |
543d9cfe ACM |
1946 | int compat_sock_common_getsockopt(struct socket *sock, int level, int optname, |
1947 | char __user *optval, int __user *optlen) | |
3fdadf7d DM |
1948 | { |
1949 | struct sock *sk = sock->sk; | |
1950 | ||
1e51f951 | 1951 | if (sk->sk_prot->compat_getsockopt != NULL) |
543d9cfe ACM |
1952 | return sk->sk_prot->compat_getsockopt(sk, level, optname, |
1953 | optval, optlen); | |
3fdadf7d DM |
1954 | return sk->sk_prot->getsockopt(sk, level, optname, optval, optlen); |
1955 | } | |
1956 | EXPORT_SYMBOL(compat_sock_common_getsockopt); | |
1957 | #endif | |
1958 | ||
1da177e4 LT |
1959 | int sock_common_recvmsg(struct kiocb *iocb, struct socket *sock, |
1960 | struct msghdr *msg, size_t size, int flags) | |
1961 | { | |
1962 | struct sock *sk = sock->sk; | |
1963 | int addr_len = 0; | |
1964 | int err; | |
1965 | ||
1966 | err = sk->sk_prot->recvmsg(iocb, sk, msg, size, flags & MSG_DONTWAIT, | |
1967 | flags & ~MSG_DONTWAIT, &addr_len); | |
1968 | if (err >= 0) | |
1969 | msg->msg_namelen = addr_len; | |
1970 | return err; | |
1971 | } | |
1da177e4 LT |
1972 | EXPORT_SYMBOL(sock_common_recvmsg); |
1973 | ||
1974 | /* | |
1975 | * Set socket options on an inet socket. | |
1976 | */ | |
1977 | int sock_common_setsockopt(struct socket *sock, int level, int optname, | |
1978 | char __user *optval, int optlen) | |
1979 | { | |
1980 | struct sock *sk = sock->sk; | |
1981 | ||
1982 | return sk->sk_prot->setsockopt(sk, level, optname, optval, optlen); | |
1983 | } | |
1da177e4 LT |
1984 | EXPORT_SYMBOL(sock_common_setsockopt); |
1985 | ||
3fdadf7d | 1986 | #ifdef CONFIG_COMPAT |
543d9cfe ACM |
1987 | int compat_sock_common_setsockopt(struct socket *sock, int level, int optname, |
1988 | char __user *optval, int optlen) | |
3fdadf7d DM |
1989 | { |
1990 | struct sock *sk = sock->sk; | |
1991 | ||
543d9cfe ACM |
1992 | if (sk->sk_prot->compat_setsockopt != NULL) |
1993 | return sk->sk_prot->compat_setsockopt(sk, level, optname, | |
1994 | optval, optlen); | |
3fdadf7d DM |
1995 | return sk->sk_prot->setsockopt(sk, level, optname, optval, optlen); |
1996 | } | |
1997 | EXPORT_SYMBOL(compat_sock_common_setsockopt); | |
1998 | #endif | |
1999 | ||
1da177e4 LT |
2000 | void sk_common_release(struct sock *sk) |
2001 | { | |
2002 | if (sk->sk_prot->destroy) | |
2003 | sk->sk_prot->destroy(sk); | |
2004 | ||
2005 | /* | |
2006 | * Observation: when sock_common_release is called, processes have | |
2007 | * no access to socket. But net still has. | |
2008 | * Step one, detach it from networking: | |
2009 | * | |
2010 | * A. Remove from hash tables. | |
2011 | */ | |
2012 | ||
2013 | sk->sk_prot->unhash(sk); | |
2014 | ||
2015 | /* | |
2016 | * In this point socket cannot receive new packets, but it is possible | |
2017 | * that some packets are in flight because some CPU runs receiver and | |
2018 | * did hash table lookup before we unhashed socket. They will achieve | |
2019 | * receive queue and will be purged by socket destructor. | |
2020 | * | |
2021 | * Also we still have packets pending on receive queue and probably, | |
2022 | * our own packets waiting in device queues. sock_destroy will drain | |
2023 | * receive queue, but transmitted packets will delay socket destruction | |
2024 | * until the last reference will be released. | |
2025 | */ | |
2026 | ||
2027 | sock_orphan(sk); | |
2028 | ||
2029 | xfrm_sk_free_policy(sk); | |
2030 | ||
e6848976 | 2031 | sk_refcnt_debug_release(sk); |
1da177e4 LT |
2032 | sock_put(sk); |
2033 | } | |
1da177e4 LT |
2034 | EXPORT_SYMBOL(sk_common_release); |
2035 | ||
2036 | static DEFINE_RWLOCK(proto_list_lock); | |
2037 | static LIST_HEAD(proto_list); | |
2038 | ||
13ff3d6f PE |
2039 | #ifdef CONFIG_PROC_FS |
2040 | #define PROTO_INUSE_NR 64 /* should be enough for the first time */ | |
1338d466 PE |
2041 | struct prot_inuse { |
2042 | int val[PROTO_INUSE_NR]; | |
2043 | }; | |
13ff3d6f PE |
2044 | |
2045 | static DECLARE_BITMAP(proto_inuse_idx, PROTO_INUSE_NR); | |
70ee1159 PE |
2046 | |
2047 | #ifdef CONFIG_NET_NS | |
2048 | void sock_prot_inuse_add(struct net *net, struct proto *prot, int val) | |
2049 | { | |
2050 | int cpu = smp_processor_id(); | |
2051 | per_cpu_ptr(net->core.inuse, cpu)->val[prot->inuse_idx] += val; | |
2052 | } | |
2053 | EXPORT_SYMBOL_GPL(sock_prot_inuse_add); | |
2054 | ||
2055 | int sock_prot_inuse_get(struct net *net, struct proto *prot) | |
2056 | { | |
2057 | int cpu, idx = prot->inuse_idx; | |
2058 | int res = 0; | |
2059 | ||
2060 | for_each_possible_cpu(cpu) | |
2061 | res += per_cpu_ptr(net->core.inuse, cpu)->val[idx]; | |
2062 | ||
2063 | return res >= 0 ? res : 0; | |
2064 | } | |
2065 | EXPORT_SYMBOL_GPL(sock_prot_inuse_get); | |
2066 | ||
2067 | static int sock_inuse_init_net(struct net *net) | |
2068 | { | |
2069 | net->core.inuse = alloc_percpu(struct prot_inuse); | |
2070 | return net->core.inuse ? 0 : -ENOMEM; | |
2071 | } | |
2072 | ||
2073 | static void sock_inuse_exit_net(struct net *net) | |
2074 | { | |
2075 | free_percpu(net->core.inuse); | |
2076 | } | |
2077 | ||
2078 | static struct pernet_operations net_inuse_ops = { | |
2079 | .init = sock_inuse_init_net, | |
2080 | .exit = sock_inuse_exit_net, | |
2081 | }; | |
2082 | ||
2083 | static __init int net_inuse_init(void) | |
2084 | { | |
2085 | if (register_pernet_subsys(&net_inuse_ops)) | |
2086 | panic("Cannot initialize net inuse counters"); | |
2087 | ||
2088 | return 0; | |
2089 | } | |
2090 | ||
2091 | core_initcall(net_inuse_init); | |
2092 | #else | |
1338d466 PE |
2093 | static DEFINE_PER_CPU(struct prot_inuse, prot_inuse); |
2094 | ||
c29a0bc4 | 2095 | void sock_prot_inuse_add(struct net *net, struct proto *prot, int val) |
1338d466 PE |
2096 | { |
2097 | __get_cpu_var(prot_inuse).val[prot->inuse_idx] += val; | |
2098 | } | |
2099 | EXPORT_SYMBOL_GPL(sock_prot_inuse_add); | |
2100 | ||
c29a0bc4 | 2101 | int sock_prot_inuse_get(struct net *net, struct proto *prot) |
1338d466 PE |
2102 | { |
2103 | int cpu, idx = prot->inuse_idx; | |
2104 | int res = 0; | |
2105 | ||
2106 | for_each_possible_cpu(cpu) | |
2107 | res += per_cpu(prot_inuse, cpu).val[idx]; | |
2108 | ||
2109 | return res >= 0 ? res : 0; | |
2110 | } | |
2111 | EXPORT_SYMBOL_GPL(sock_prot_inuse_get); | |
70ee1159 | 2112 | #endif |
13ff3d6f PE |
2113 | |
2114 | static void assign_proto_idx(struct proto *prot) | |
2115 | { | |
2116 | prot->inuse_idx = find_first_zero_bit(proto_inuse_idx, PROTO_INUSE_NR); | |
2117 | ||
2118 | if (unlikely(prot->inuse_idx == PROTO_INUSE_NR - 1)) { | |
2119 | printk(KERN_ERR "PROTO_INUSE_NR exhausted\n"); | |
2120 | return; | |
2121 | } | |
2122 | ||
2123 | set_bit(prot->inuse_idx, proto_inuse_idx); | |
2124 | } | |
2125 | ||
2126 | static void release_proto_idx(struct proto *prot) | |
2127 | { | |
2128 | if (prot->inuse_idx != PROTO_INUSE_NR - 1) | |
2129 | clear_bit(prot->inuse_idx, proto_inuse_idx); | |
2130 | } | |
2131 | #else | |
2132 | static inline void assign_proto_idx(struct proto *prot) | |
2133 | { | |
2134 | } | |
2135 | ||
2136 | static inline void release_proto_idx(struct proto *prot) | |
2137 | { | |
2138 | } | |
2139 | #endif | |
2140 | ||
b733c007 PE |
2141 | int proto_register(struct proto *prot, int alloc_slab) |
2142 | { | |
1da177e4 LT |
2143 | if (alloc_slab) { |
2144 | prot->slab = kmem_cache_create(prot->name, prot->obj_size, 0, | |
271b72c7 ED |
2145 | SLAB_HWCACHE_ALIGN | prot->slab_flags, |
2146 | NULL); | |
1da177e4 LT |
2147 | |
2148 | if (prot->slab == NULL) { | |
2149 | printk(KERN_CRIT "%s: Can't create sock SLAB cache!\n", | |
2150 | prot->name); | |
60e7663d | 2151 | goto out; |
1da177e4 | 2152 | } |
2e6599cb ACM |
2153 | |
2154 | if (prot->rsk_prot != NULL) { | |
2155 | static const char mask[] = "request_sock_%s"; | |
2156 | ||
7e56b5d6 CM |
2157 | prot->rsk_prot->slab_name = kmalloc(strlen(prot->name) + sizeof(mask) - 1, GFP_KERNEL); |
2158 | if (prot->rsk_prot->slab_name == NULL) | |
2e6599cb ACM |
2159 | goto out_free_sock_slab; |
2160 | ||
7e56b5d6 CM |
2161 | sprintf(prot->rsk_prot->slab_name, mask, prot->name); |
2162 | prot->rsk_prot->slab = kmem_cache_create(prot->rsk_prot->slab_name, | |
2e6599cb | 2163 | prot->rsk_prot->obj_size, 0, |
20c2df83 | 2164 | SLAB_HWCACHE_ALIGN, NULL); |
2e6599cb ACM |
2165 | |
2166 | if (prot->rsk_prot->slab == NULL) { | |
2167 | printk(KERN_CRIT "%s: Can't create request sock SLAB cache!\n", | |
2168 | prot->name); | |
2169 | goto out_free_request_sock_slab_name; | |
2170 | } | |
2171 | } | |
8feaf0c0 | 2172 | |
6d6ee43e | 2173 | if (prot->twsk_prot != NULL) { |
8feaf0c0 ACM |
2174 | static const char mask[] = "tw_sock_%s"; |
2175 | ||
7e56b5d6 | 2176 | prot->twsk_prot->twsk_slab_name = kmalloc(strlen(prot->name) + sizeof(mask) - 1, GFP_KERNEL); |
8feaf0c0 | 2177 | |
7e56b5d6 | 2178 | if (prot->twsk_prot->twsk_slab_name == NULL) |
8feaf0c0 ACM |
2179 | goto out_free_request_sock_slab; |
2180 | ||
7e56b5d6 | 2181 | sprintf(prot->twsk_prot->twsk_slab_name, mask, prot->name); |
6d6ee43e | 2182 | prot->twsk_prot->twsk_slab = |
7e56b5d6 | 2183 | kmem_cache_create(prot->twsk_prot->twsk_slab_name, |
6d6ee43e | 2184 | prot->twsk_prot->twsk_obj_size, |
3ab5aee7 ED |
2185 | 0, |
2186 | SLAB_HWCACHE_ALIGN | | |
2187 | prot->slab_flags, | |
20c2df83 | 2188 | NULL); |
6d6ee43e | 2189 | if (prot->twsk_prot->twsk_slab == NULL) |
8feaf0c0 ACM |
2190 | goto out_free_timewait_sock_slab_name; |
2191 | } | |
1da177e4 LT |
2192 | } |
2193 | ||
2a278051 | 2194 | write_lock(&proto_list_lock); |
1da177e4 | 2195 | list_add(&prot->node, &proto_list); |
13ff3d6f | 2196 | assign_proto_idx(prot); |
1da177e4 | 2197 | write_unlock(&proto_list_lock); |
b733c007 PE |
2198 | return 0; |
2199 | ||
8feaf0c0 | 2200 | out_free_timewait_sock_slab_name: |
7e56b5d6 | 2201 | kfree(prot->twsk_prot->twsk_slab_name); |
8feaf0c0 ACM |
2202 | out_free_request_sock_slab: |
2203 | if (prot->rsk_prot && prot->rsk_prot->slab) { | |
2204 | kmem_cache_destroy(prot->rsk_prot->slab); | |
2205 | prot->rsk_prot->slab = NULL; | |
2206 | } | |
2e6599cb | 2207 | out_free_request_sock_slab_name: |
7e56b5d6 | 2208 | kfree(prot->rsk_prot->slab_name); |
2e6599cb ACM |
2209 | out_free_sock_slab: |
2210 | kmem_cache_destroy(prot->slab); | |
2211 | prot->slab = NULL; | |
b733c007 PE |
2212 | out: |
2213 | return -ENOBUFS; | |
1da177e4 | 2214 | } |
1da177e4 LT |
2215 | EXPORT_SYMBOL(proto_register); |
2216 | ||
2217 | void proto_unregister(struct proto *prot) | |
2218 | { | |
2219 | write_lock(&proto_list_lock); | |
13ff3d6f | 2220 | release_proto_idx(prot); |
0a3f4358 PM |
2221 | list_del(&prot->node); |
2222 | write_unlock(&proto_list_lock); | |
1da177e4 LT |
2223 | |
2224 | if (prot->slab != NULL) { | |
2225 | kmem_cache_destroy(prot->slab); | |
2226 | prot->slab = NULL; | |
2227 | } | |
2228 | ||
2e6599cb | 2229 | if (prot->rsk_prot != NULL && prot->rsk_prot->slab != NULL) { |
2e6599cb | 2230 | kmem_cache_destroy(prot->rsk_prot->slab); |
7e56b5d6 | 2231 | kfree(prot->rsk_prot->slab_name); |
2e6599cb ACM |
2232 | prot->rsk_prot->slab = NULL; |
2233 | } | |
2234 | ||
6d6ee43e | 2235 | if (prot->twsk_prot != NULL && prot->twsk_prot->twsk_slab != NULL) { |
6d6ee43e | 2236 | kmem_cache_destroy(prot->twsk_prot->twsk_slab); |
7e56b5d6 | 2237 | kfree(prot->twsk_prot->twsk_slab_name); |
6d6ee43e | 2238 | prot->twsk_prot->twsk_slab = NULL; |
8feaf0c0 | 2239 | } |
1da177e4 | 2240 | } |
1da177e4 LT |
2241 | EXPORT_SYMBOL(proto_unregister); |
2242 | ||
2243 | #ifdef CONFIG_PROC_FS | |
1da177e4 | 2244 | static void *proto_seq_start(struct seq_file *seq, loff_t *pos) |
9a429c49 | 2245 | __acquires(proto_list_lock) |
1da177e4 LT |
2246 | { |
2247 | read_lock(&proto_list_lock); | |
60f0438a | 2248 | return seq_list_start_head(&proto_list, *pos); |
1da177e4 LT |
2249 | } |
2250 | ||
2251 | static void *proto_seq_next(struct seq_file *seq, void *v, loff_t *pos) | |
2252 | { | |
60f0438a | 2253 | return seq_list_next(v, &proto_list, pos); |
1da177e4 LT |
2254 | } |
2255 | ||
2256 | static void proto_seq_stop(struct seq_file *seq, void *v) | |
9a429c49 | 2257 | __releases(proto_list_lock) |
1da177e4 LT |
2258 | { |
2259 | read_unlock(&proto_list_lock); | |
2260 | } | |
2261 | ||
2262 | static char proto_method_implemented(const void *method) | |
2263 | { | |
2264 | return method == NULL ? 'n' : 'y'; | |
2265 | } | |
2266 | ||
2267 | static void proto_seq_printf(struct seq_file *seq, struct proto *proto) | |
2268 | { | |
2269 | seq_printf(seq, "%-9s %4u %6d %6d %-3s %6u %-3s %-10s " | |
2270 | "%2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c\n", | |
2271 | proto->name, | |
2272 | proto->obj_size, | |
14e943db | 2273 | sock_prot_inuse_get(seq_file_net(seq), proto), |
1da177e4 LT |
2274 | proto->memory_allocated != NULL ? atomic_read(proto->memory_allocated) : -1, |
2275 | proto->memory_pressure != NULL ? *proto->memory_pressure ? "yes" : "no" : "NI", | |
2276 | proto->max_header, | |
2277 | proto->slab == NULL ? "no" : "yes", | |
2278 | module_name(proto->owner), | |
2279 | proto_method_implemented(proto->close), | |
2280 | proto_method_implemented(proto->connect), | |
2281 | proto_method_implemented(proto->disconnect), | |
2282 | proto_method_implemented(proto->accept), | |
2283 | proto_method_implemented(proto->ioctl), | |
2284 | proto_method_implemented(proto->init), | |
2285 | proto_method_implemented(proto->destroy), | |
2286 | proto_method_implemented(proto->shutdown), | |
2287 | proto_method_implemented(proto->setsockopt), | |
2288 | proto_method_implemented(proto->getsockopt), | |
2289 | proto_method_implemented(proto->sendmsg), | |
2290 | proto_method_implemented(proto->recvmsg), | |
2291 | proto_method_implemented(proto->sendpage), | |
2292 | proto_method_implemented(proto->bind), | |
2293 | proto_method_implemented(proto->backlog_rcv), | |
2294 | proto_method_implemented(proto->hash), | |
2295 | proto_method_implemented(proto->unhash), | |
2296 | proto_method_implemented(proto->get_port), | |
2297 | proto_method_implemented(proto->enter_memory_pressure)); | |
2298 | } | |
2299 | ||
2300 | static int proto_seq_show(struct seq_file *seq, void *v) | |
2301 | { | |
60f0438a | 2302 | if (v == &proto_list) |
1da177e4 LT |
2303 | seq_printf(seq, "%-9s %-4s %-8s %-6s %-5s %-7s %-4s %-10s %s", |
2304 | "protocol", | |
2305 | "size", | |
2306 | "sockets", | |
2307 | "memory", | |
2308 | "press", | |
2309 | "maxhdr", | |
2310 | "slab", | |
2311 | "module", | |
2312 | "cl co di ac io in de sh ss gs se re sp bi br ha uh gp em\n"); | |
2313 | else | |
60f0438a | 2314 | proto_seq_printf(seq, list_entry(v, struct proto, node)); |
1da177e4 LT |
2315 | return 0; |
2316 | } | |
2317 | ||
f690808e | 2318 | static const struct seq_operations proto_seq_ops = { |
1da177e4 LT |
2319 | .start = proto_seq_start, |
2320 | .next = proto_seq_next, | |
2321 | .stop = proto_seq_stop, | |
2322 | .show = proto_seq_show, | |
2323 | }; | |
2324 | ||
2325 | static int proto_seq_open(struct inode *inode, struct file *file) | |
2326 | { | |
14e943db ED |
2327 | return seq_open_net(inode, file, &proto_seq_ops, |
2328 | sizeof(struct seq_net_private)); | |
1da177e4 LT |
2329 | } |
2330 | ||
9a32144e | 2331 | static const struct file_operations proto_seq_fops = { |
1da177e4 LT |
2332 | .owner = THIS_MODULE, |
2333 | .open = proto_seq_open, | |
2334 | .read = seq_read, | |
2335 | .llseek = seq_lseek, | |
14e943db ED |
2336 | .release = seq_release_net, |
2337 | }; | |
2338 | ||
2339 | static __net_init int proto_init_net(struct net *net) | |
2340 | { | |
2341 | if (!proc_net_fops_create(net, "protocols", S_IRUGO, &proto_seq_fops)) | |
2342 | return -ENOMEM; | |
2343 | ||
2344 | return 0; | |
2345 | } | |
2346 | ||
2347 | static __net_exit void proto_exit_net(struct net *net) | |
2348 | { | |
2349 | proc_net_remove(net, "protocols"); | |
2350 | } | |
2351 | ||
2352 | ||
2353 | static __net_initdata struct pernet_operations proto_net_ops = { | |
2354 | .init = proto_init_net, | |
2355 | .exit = proto_exit_net, | |
1da177e4 LT |
2356 | }; |
2357 | ||
2358 | static int __init proto_init(void) | |
2359 | { | |
14e943db | 2360 | return register_pernet_subsys(&proto_net_ops); |
1da177e4 LT |
2361 | } |
2362 | ||
2363 | subsys_initcall(proto_init); | |
2364 | ||
2365 | #endif /* PROC_FS */ |