]>
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 LT |
122 | #include <net/sock.h> |
123 | #include <net/xfrm.h> | |
124 | #include <linux/ipsec.h> | |
125 | ||
126 | #include <linux/filter.h> | |
127 | ||
128 | #ifdef CONFIG_INET | |
129 | #include <net/tcp.h> | |
130 | #endif | |
131 | ||
da21f24d IM |
132 | /* |
133 | * Each address family might have different locking rules, so we have | |
134 | * one slock key per address family: | |
135 | */ | |
a5b5bb9a IM |
136 | static struct lock_class_key af_family_keys[AF_MAX]; |
137 | static struct lock_class_key af_family_slock_keys[AF_MAX]; | |
138 | ||
a5b5bb9a IM |
139 | /* |
140 | * Make lock validator output more readable. (we pre-construct these | |
141 | * strings build-time, so that runtime initialization of socket | |
142 | * locks is fast): | |
143 | */ | |
144 | static const char *af_family_key_strings[AF_MAX+1] = { | |
145 | "sk_lock-AF_UNSPEC", "sk_lock-AF_UNIX" , "sk_lock-AF_INET" , | |
146 | "sk_lock-AF_AX25" , "sk_lock-AF_IPX" , "sk_lock-AF_APPLETALK", | |
147 | "sk_lock-AF_NETROM", "sk_lock-AF_BRIDGE" , "sk_lock-AF_ATMPVC" , | |
148 | "sk_lock-AF_X25" , "sk_lock-AF_INET6" , "sk_lock-AF_ROSE" , | |
149 | "sk_lock-AF_DECnet", "sk_lock-AF_NETBEUI" , "sk_lock-AF_SECURITY" , | |
150 | "sk_lock-AF_KEY" , "sk_lock-AF_NETLINK" , "sk_lock-AF_PACKET" , | |
151 | "sk_lock-AF_ASH" , "sk_lock-AF_ECONET" , "sk_lock-AF_ATMSVC" , | |
152 | "sk_lock-21" , "sk_lock-AF_SNA" , "sk_lock-AF_IRDA" , | |
153 | "sk_lock-AF_PPPOX" , "sk_lock-AF_WANPIPE" , "sk_lock-AF_LLC" , | |
cd05acfe | 154 | "sk_lock-27" , "sk_lock-28" , "sk_lock-AF_CAN" , |
17926a79 | 155 | "sk_lock-AF_TIPC" , "sk_lock-AF_BLUETOOTH", "sk_lock-IUCV" , |
bce7b154 RDC |
156 | "sk_lock-AF_RXRPC" , "sk_lock-AF_ISDN" , "sk_lock-AF_PHONET" , |
157 | "sk_lock-AF_MAX" | |
a5b5bb9a IM |
158 | }; |
159 | static const char *af_family_slock_key_strings[AF_MAX+1] = { | |
160 | "slock-AF_UNSPEC", "slock-AF_UNIX" , "slock-AF_INET" , | |
161 | "slock-AF_AX25" , "slock-AF_IPX" , "slock-AF_APPLETALK", | |
162 | "slock-AF_NETROM", "slock-AF_BRIDGE" , "slock-AF_ATMPVC" , | |
163 | "slock-AF_X25" , "slock-AF_INET6" , "slock-AF_ROSE" , | |
164 | "slock-AF_DECnet", "slock-AF_NETBEUI" , "slock-AF_SECURITY" , | |
165 | "slock-AF_KEY" , "slock-AF_NETLINK" , "slock-AF_PACKET" , | |
166 | "slock-AF_ASH" , "slock-AF_ECONET" , "slock-AF_ATMSVC" , | |
167 | "slock-21" , "slock-AF_SNA" , "slock-AF_IRDA" , | |
168 | "slock-AF_PPPOX" , "slock-AF_WANPIPE" , "slock-AF_LLC" , | |
cd05acfe | 169 | "slock-27" , "slock-28" , "slock-AF_CAN" , |
17926a79 | 170 | "slock-AF_TIPC" , "slock-AF_BLUETOOTH", "slock-AF_IUCV" , |
bce7b154 RDC |
171 | "slock-AF_RXRPC" , "slock-AF_ISDN" , "slock-AF_PHONET" , |
172 | "slock-AF_MAX" | |
a5b5bb9a | 173 | }; |
443aef0e PZ |
174 | static const char *af_family_clock_key_strings[AF_MAX+1] = { |
175 | "clock-AF_UNSPEC", "clock-AF_UNIX" , "clock-AF_INET" , | |
176 | "clock-AF_AX25" , "clock-AF_IPX" , "clock-AF_APPLETALK", | |
177 | "clock-AF_NETROM", "clock-AF_BRIDGE" , "clock-AF_ATMPVC" , | |
178 | "clock-AF_X25" , "clock-AF_INET6" , "clock-AF_ROSE" , | |
179 | "clock-AF_DECnet", "clock-AF_NETBEUI" , "clock-AF_SECURITY" , | |
180 | "clock-AF_KEY" , "clock-AF_NETLINK" , "clock-AF_PACKET" , | |
181 | "clock-AF_ASH" , "clock-AF_ECONET" , "clock-AF_ATMSVC" , | |
182 | "clock-21" , "clock-AF_SNA" , "clock-AF_IRDA" , | |
183 | "clock-AF_PPPOX" , "clock-AF_WANPIPE" , "clock-AF_LLC" , | |
b4942af6 | 184 | "clock-27" , "clock-28" , "clock-AF_CAN" , |
e51f802b | 185 | "clock-AF_TIPC" , "clock-AF_BLUETOOTH", "clock-AF_IUCV" , |
bce7b154 RDC |
186 | "clock-AF_RXRPC" , "clock-AF_ISDN" , "clock-AF_PHONET" , |
187 | "clock-AF_MAX" | |
443aef0e | 188 | }; |
da21f24d IM |
189 | |
190 | /* | |
191 | * sk_callback_lock locking rules are per-address-family, | |
192 | * so split the lock classes by using a per-AF key: | |
193 | */ | |
194 | static struct lock_class_key af_callback_keys[AF_MAX]; | |
195 | ||
1da177e4 LT |
196 | /* Take into consideration the size of the struct sk_buff overhead in the |
197 | * determination of these values, since that is non-constant across | |
198 | * platforms. This makes socket queueing behavior and performance | |
199 | * not depend upon such differences. | |
200 | */ | |
201 | #define _SK_MEM_PACKETS 256 | |
202 | #define _SK_MEM_OVERHEAD (sizeof(struct sk_buff) + 256) | |
203 | #define SK_WMEM_MAX (_SK_MEM_OVERHEAD * _SK_MEM_PACKETS) | |
204 | #define SK_RMEM_MAX (_SK_MEM_OVERHEAD * _SK_MEM_PACKETS) | |
205 | ||
206 | /* Run time adjustable parameters. */ | |
ab32ea5d BH |
207 | __u32 sysctl_wmem_max __read_mostly = SK_WMEM_MAX; |
208 | __u32 sysctl_rmem_max __read_mostly = SK_RMEM_MAX; | |
209 | __u32 sysctl_wmem_default __read_mostly = SK_WMEM_MAX; | |
210 | __u32 sysctl_rmem_default __read_mostly = SK_RMEM_MAX; | |
1da177e4 LT |
211 | |
212 | /* Maximal space eaten by iovec or ancilliary data plus some space */ | |
ab32ea5d | 213 | int sysctl_optmem_max __read_mostly = sizeof(unsigned long)*(2*UIO_MAXIOV+512); |
1da177e4 LT |
214 | |
215 | static int sock_set_timeout(long *timeo_p, char __user *optval, int optlen) | |
216 | { | |
217 | struct timeval tv; | |
218 | ||
219 | if (optlen < sizeof(tv)) | |
220 | return -EINVAL; | |
221 | if (copy_from_user(&tv, optval, sizeof(tv))) | |
222 | return -EFAULT; | |
ba78073e VA |
223 | if (tv.tv_usec < 0 || tv.tv_usec >= USEC_PER_SEC) |
224 | return -EDOM; | |
1da177e4 | 225 | |
ba78073e | 226 | if (tv.tv_sec < 0) { |
6f11df83 AM |
227 | static int warned __read_mostly; |
228 | ||
ba78073e | 229 | *timeo_p = 0; |
50aab54f | 230 | if (warned < 10 && net_ratelimit()) { |
ba78073e VA |
231 | warned++; |
232 | printk(KERN_INFO "sock_set_timeout: `%s' (pid %d) " | |
233 | "tries to set negative timeout\n", | |
ba25f9dc | 234 | current->comm, task_pid_nr(current)); |
50aab54f | 235 | } |
ba78073e VA |
236 | return 0; |
237 | } | |
1da177e4 LT |
238 | *timeo_p = MAX_SCHEDULE_TIMEOUT; |
239 | if (tv.tv_sec == 0 && tv.tv_usec == 0) | |
240 | return 0; | |
241 | if (tv.tv_sec < (MAX_SCHEDULE_TIMEOUT/HZ - 1)) | |
242 | *timeo_p = tv.tv_sec*HZ + (tv.tv_usec+(1000000/HZ-1))/(1000000/HZ); | |
243 | return 0; | |
244 | } | |
245 | ||
246 | static void sock_warn_obsolete_bsdism(const char *name) | |
247 | { | |
248 | static int warned; | |
249 | static char warncomm[TASK_COMM_LEN]; | |
4ec93edb YH |
250 | if (strcmp(warncomm, current->comm) && warned < 5) { |
251 | strcpy(warncomm, current->comm); | |
1da177e4 LT |
252 | printk(KERN_WARNING "process `%s' is using obsolete " |
253 | "%s SO_BSDCOMPAT\n", warncomm, name); | |
254 | warned++; | |
255 | } | |
256 | } | |
257 | ||
258 | static void sock_disable_timestamp(struct sock *sk) | |
4ec93edb YH |
259 | { |
260 | if (sock_flag(sk, SOCK_TIMESTAMP)) { | |
1da177e4 LT |
261 | sock_reset_flag(sk, SOCK_TIMESTAMP); |
262 | net_disable_timestamp(); | |
263 | } | |
264 | } | |
265 | ||
266 | ||
f0088a50 DV |
267 | int sock_queue_rcv_skb(struct sock *sk, struct sk_buff *skb) |
268 | { | |
269 | int err = 0; | |
270 | int skb_len; | |
271 | ||
9ee6b7f1 | 272 | /* Cast sk->rcvbuf to unsigned... It's pointless, but reduces |
f0088a50 DV |
273 | number of warnings when compiling with -W --ANK |
274 | */ | |
275 | if (atomic_read(&sk->sk_rmem_alloc) + skb->truesize >= | |
276 | (unsigned)sk->sk_rcvbuf) { | |
277 | err = -ENOMEM; | |
278 | goto out; | |
279 | } | |
280 | ||
fda9ef5d | 281 | err = sk_filter(sk, skb); |
f0088a50 DV |
282 | if (err) |
283 | goto out; | |
284 | ||
3ab224be HA |
285 | if (!sk_rmem_schedule(sk, skb->truesize)) { |
286 | err = -ENOBUFS; | |
287 | goto out; | |
288 | } | |
289 | ||
f0088a50 DV |
290 | skb->dev = NULL; |
291 | skb_set_owner_r(skb, sk); | |
292 | ||
293 | /* Cache the SKB length before we tack it onto the receive | |
294 | * queue. Once it is added it no longer belongs to us and | |
295 | * may be freed by other threads of control pulling packets | |
296 | * from the queue. | |
297 | */ | |
298 | skb_len = skb->len; | |
299 | ||
300 | skb_queue_tail(&sk->sk_receive_queue, skb); | |
301 | ||
302 | if (!sock_flag(sk, SOCK_DEAD)) | |
303 | sk->sk_data_ready(sk, skb_len); | |
304 | out: | |
305 | return err; | |
306 | } | |
307 | EXPORT_SYMBOL(sock_queue_rcv_skb); | |
308 | ||
58a5a7b9 | 309 | int sk_receive_skb(struct sock *sk, struct sk_buff *skb, const int nested) |
f0088a50 DV |
310 | { |
311 | int rc = NET_RX_SUCCESS; | |
312 | ||
fda9ef5d | 313 | if (sk_filter(sk, skb)) |
f0088a50 DV |
314 | goto discard_and_relse; |
315 | ||
316 | skb->dev = NULL; | |
317 | ||
58a5a7b9 ACM |
318 | if (nested) |
319 | bh_lock_sock_nested(sk); | |
320 | else | |
321 | bh_lock_sock(sk); | |
a5b5bb9a IM |
322 | if (!sock_owned_by_user(sk)) { |
323 | /* | |
324 | * trylock + unlock semantics: | |
325 | */ | |
326 | mutex_acquire(&sk->sk_lock.dep_map, 0, 1, _RET_IP_); | |
327 | ||
c57943a1 | 328 | rc = sk_backlog_rcv(sk, skb); |
a5b5bb9a IM |
329 | |
330 | mutex_release(&sk->sk_lock.dep_map, 1, _RET_IP_); | |
331 | } else | |
f0088a50 DV |
332 | sk_add_backlog(sk, skb); |
333 | bh_unlock_sock(sk); | |
334 | out: | |
335 | sock_put(sk); | |
336 | return rc; | |
337 | discard_and_relse: | |
338 | kfree_skb(skb); | |
339 | goto out; | |
340 | } | |
341 | EXPORT_SYMBOL(sk_receive_skb); | |
342 | ||
343 | struct dst_entry *__sk_dst_check(struct sock *sk, u32 cookie) | |
344 | { | |
345 | struct dst_entry *dst = sk->sk_dst_cache; | |
346 | ||
347 | if (dst && dst->obsolete && dst->ops->check(dst, cookie) == NULL) { | |
348 | sk->sk_dst_cache = NULL; | |
349 | dst_release(dst); | |
350 | return NULL; | |
351 | } | |
352 | ||
353 | return dst; | |
354 | } | |
355 | EXPORT_SYMBOL(__sk_dst_check); | |
356 | ||
357 | struct dst_entry *sk_dst_check(struct sock *sk, u32 cookie) | |
358 | { | |
359 | struct dst_entry *dst = sk_dst_get(sk); | |
360 | ||
361 | if (dst && dst->obsolete && dst->ops->check(dst, cookie) == NULL) { | |
362 | sk_dst_reset(sk); | |
363 | dst_release(dst); | |
364 | return NULL; | |
365 | } | |
366 | ||
367 | return dst; | |
368 | } | |
369 | EXPORT_SYMBOL(sk_dst_check); | |
370 | ||
4878809f DM |
371 | static int sock_bindtodevice(struct sock *sk, char __user *optval, int optlen) |
372 | { | |
373 | int ret = -ENOPROTOOPT; | |
374 | #ifdef CONFIG_NETDEVICES | |
3b1e0a65 | 375 | struct net *net = sock_net(sk); |
4878809f DM |
376 | char devname[IFNAMSIZ]; |
377 | int index; | |
378 | ||
379 | /* Sorry... */ | |
380 | ret = -EPERM; | |
381 | if (!capable(CAP_NET_RAW)) | |
382 | goto out; | |
383 | ||
384 | ret = -EINVAL; | |
385 | if (optlen < 0) | |
386 | goto out; | |
387 | ||
388 | /* Bind this socket to a particular device like "eth0", | |
389 | * as specified in the passed interface name. If the | |
390 | * name is "" or the option length is zero the socket | |
391 | * is not bound. | |
392 | */ | |
393 | if (optlen > IFNAMSIZ - 1) | |
394 | optlen = IFNAMSIZ - 1; | |
395 | memset(devname, 0, sizeof(devname)); | |
396 | ||
397 | ret = -EFAULT; | |
398 | if (copy_from_user(devname, optval, optlen)) | |
399 | goto out; | |
400 | ||
401 | if (devname[0] == '\0') { | |
402 | index = 0; | |
403 | } else { | |
881d966b | 404 | struct net_device *dev = dev_get_by_name(net, devname); |
4878809f DM |
405 | |
406 | ret = -ENODEV; | |
407 | if (!dev) | |
408 | goto out; | |
409 | ||
410 | index = dev->ifindex; | |
411 | dev_put(dev); | |
412 | } | |
413 | ||
414 | lock_sock(sk); | |
415 | sk->sk_bound_dev_if = index; | |
416 | sk_dst_reset(sk); | |
417 | release_sock(sk); | |
418 | ||
419 | ret = 0; | |
420 | ||
421 | out: | |
422 | #endif | |
423 | ||
424 | return ret; | |
425 | } | |
426 | ||
c0ef877b PE |
427 | static inline void sock_valbool_flag(struct sock *sk, int bit, int valbool) |
428 | { | |
429 | if (valbool) | |
430 | sock_set_flag(sk, bit); | |
431 | else | |
432 | sock_reset_flag(sk, bit); | |
433 | } | |
434 | ||
1da177e4 LT |
435 | /* |
436 | * This is meant for all protocols to use and covers goings on | |
437 | * at the socket level. Everything here is generic. | |
438 | */ | |
439 | ||
440 | int sock_setsockopt(struct socket *sock, int level, int optname, | |
441 | char __user *optval, int optlen) | |
442 | { | |
443 | struct sock *sk=sock->sk; | |
1da177e4 LT |
444 | int val; |
445 | int valbool; | |
446 | struct linger ling; | |
447 | int ret = 0; | |
4ec93edb | 448 | |
1da177e4 LT |
449 | /* |
450 | * Options without arguments | |
451 | */ | |
452 | ||
4878809f DM |
453 | if (optname == SO_BINDTODEVICE) |
454 | return sock_bindtodevice(sk, optval, optlen); | |
455 | ||
e71a4783 SH |
456 | if (optlen < sizeof(int)) |
457 | return -EINVAL; | |
4ec93edb | 458 | |
1da177e4 LT |
459 | if (get_user(val, (int __user *)optval)) |
460 | return -EFAULT; | |
4ec93edb YH |
461 | |
462 | valbool = val?1:0; | |
1da177e4 LT |
463 | |
464 | lock_sock(sk); | |
465 | ||
e71a4783 SH |
466 | switch(optname) { |
467 | case SO_DEBUG: | |
468 | if (val && !capable(CAP_NET_ADMIN)) { | |
469 | ret = -EACCES; | |
c0ef877b PE |
470 | } else |
471 | sock_valbool_flag(sk, SOCK_DBG, valbool); | |
e71a4783 SH |
472 | break; |
473 | case SO_REUSEADDR: | |
474 | sk->sk_reuse = valbool; | |
475 | break; | |
476 | case SO_TYPE: | |
477 | case SO_ERROR: | |
478 | ret = -ENOPROTOOPT; | |
479 | break; | |
480 | case SO_DONTROUTE: | |
c0ef877b | 481 | sock_valbool_flag(sk, SOCK_LOCALROUTE, valbool); |
e71a4783 SH |
482 | break; |
483 | case SO_BROADCAST: | |
484 | sock_valbool_flag(sk, SOCK_BROADCAST, valbool); | |
485 | break; | |
486 | case SO_SNDBUF: | |
487 | /* Don't error on this BSD doesn't and if you think | |
488 | about it this is right. Otherwise apps have to | |
489 | play 'guess the biggest size' games. RCVBUF/SNDBUF | |
490 | are treated in BSD as hints */ | |
491 | ||
492 | if (val > sysctl_wmem_max) | |
493 | val = sysctl_wmem_max; | |
b0573dea | 494 | set_sndbuf: |
e71a4783 SH |
495 | sk->sk_userlocks |= SOCK_SNDBUF_LOCK; |
496 | if ((val * 2) < SOCK_MIN_SNDBUF) | |
497 | sk->sk_sndbuf = SOCK_MIN_SNDBUF; | |
498 | else | |
499 | sk->sk_sndbuf = val * 2; | |
1da177e4 | 500 | |
e71a4783 SH |
501 | /* |
502 | * Wake up sending tasks if we | |
503 | * upped the value. | |
504 | */ | |
505 | sk->sk_write_space(sk); | |
506 | break; | |
1da177e4 | 507 | |
e71a4783 SH |
508 | case SO_SNDBUFFORCE: |
509 | if (!capable(CAP_NET_ADMIN)) { | |
510 | ret = -EPERM; | |
511 | break; | |
512 | } | |
513 | goto set_sndbuf; | |
b0573dea | 514 | |
e71a4783 SH |
515 | case SO_RCVBUF: |
516 | /* Don't error on this BSD doesn't and if you think | |
517 | about it this is right. Otherwise apps have to | |
518 | play 'guess the biggest size' games. RCVBUF/SNDBUF | |
519 | are treated in BSD as hints */ | |
4ec93edb | 520 | |
e71a4783 SH |
521 | if (val > sysctl_rmem_max) |
522 | val = sysctl_rmem_max; | |
b0573dea | 523 | set_rcvbuf: |
e71a4783 SH |
524 | sk->sk_userlocks |= SOCK_RCVBUF_LOCK; |
525 | /* | |
526 | * We double it on the way in to account for | |
527 | * "struct sk_buff" etc. overhead. Applications | |
528 | * assume that the SO_RCVBUF setting they make will | |
529 | * allow that much actual data to be received on that | |
530 | * socket. | |
531 | * | |
532 | * Applications are unaware that "struct sk_buff" and | |
533 | * other overheads allocate from the receive buffer | |
534 | * during socket buffer allocation. | |
535 | * | |
536 | * And after considering the possible alternatives, | |
537 | * returning the value we actually used in getsockopt | |
538 | * is the most desirable behavior. | |
539 | */ | |
540 | if ((val * 2) < SOCK_MIN_RCVBUF) | |
541 | sk->sk_rcvbuf = SOCK_MIN_RCVBUF; | |
542 | else | |
543 | sk->sk_rcvbuf = val * 2; | |
544 | break; | |
545 | ||
546 | case SO_RCVBUFFORCE: | |
547 | if (!capable(CAP_NET_ADMIN)) { | |
548 | ret = -EPERM; | |
1da177e4 | 549 | break; |
e71a4783 SH |
550 | } |
551 | goto set_rcvbuf; | |
1da177e4 | 552 | |
e71a4783 | 553 | case SO_KEEPALIVE: |
1da177e4 | 554 | #ifdef CONFIG_INET |
e71a4783 SH |
555 | if (sk->sk_protocol == IPPROTO_TCP) |
556 | tcp_set_keepalive(sk, valbool); | |
1da177e4 | 557 | #endif |
e71a4783 SH |
558 | sock_valbool_flag(sk, SOCK_KEEPOPEN, valbool); |
559 | break; | |
560 | ||
561 | case SO_OOBINLINE: | |
562 | sock_valbool_flag(sk, SOCK_URGINLINE, valbool); | |
563 | break; | |
564 | ||
565 | case SO_NO_CHECK: | |
566 | sk->sk_no_check = valbool; | |
567 | break; | |
568 | ||
569 | case SO_PRIORITY: | |
570 | if ((val >= 0 && val <= 6) || capable(CAP_NET_ADMIN)) | |
571 | sk->sk_priority = val; | |
572 | else | |
573 | ret = -EPERM; | |
574 | break; | |
575 | ||
576 | case SO_LINGER: | |
577 | if (optlen < sizeof(ling)) { | |
578 | ret = -EINVAL; /* 1003.1g */ | |
1da177e4 | 579 | break; |
e71a4783 SH |
580 | } |
581 | if (copy_from_user(&ling,optval,sizeof(ling))) { | |
582 | ret = -EFAULT; | |
1da177e4 | 583 | break; |
e71a4783 SH |
584 | } |
585 | if (!ling.l_onoff) | |
586 | sock_reset_flag(sk, SOCK_LINGER); | |
587 | else { | |
1da177e4 | 588 | #if (BITS_PER_LONG == 32) |
e71a4783 SH |
589 | if ((unsigned int)ling.l_linger >= MAX_SCHEDULE_TIMEOUT/HZ) |
590 | sk->sk_lingertime = MAX_SCHEDULE_TIMEOUT; | |
1da177e4 | 591 | else |
e71a4783 SH |
592 | #endif |
593 | sk->sk_lingertime = (unsigned int)ling.l_linger * HZ; | |
594 | sock_set_flag(sk, SOCK_LINGER); | |
595 | } | |
596 | break; | |
597 | ||
598 | case SO_BSDCOMPAT: | |
599 | sock_warn_obsolete_bsdism("setsockopt"); | |
600 | break; | |
601 | ||
602 | case SO_PASSCRED: | |
603 | if (valbool) | |
604 | set_bit(SOCK_PASSCRED, &sock->flags); | |
605 | else | |
606 | clear_bit(SOCK_PASSCRED, &sock->flags); | |
607 | break; | |
608 | ||
609 | case SO_TIMESTAMP: | |
92f37fd2 | 610 | case SO_TIMESTAMPNS: |
e71a4783 | 611 | if (valbool) { |
92f37fd2 ED |
612 | if (optname == SO_TIMESTAMP) |
613 | sock_reset_flag(sk, SOCK_RCVTSTAMPNS); | |
614 | else | |
615 | sock_set_flag(sk, SOCK_RCVTSTAMPNS); | |
e71a4783 SH |
616 | sock_set_flag(sk, SOCK_RCVTSTAMP); |
617 | sock_enable_timestamp(sk); | |
92f37fd2 | 618 | } else { |
e71a4783 | 619 | sock_reset_flag(sk, SOCK_RCVTSTAMP); |
92f37fd2 ED |
620 | sock_reset_flag(sk, SOCK_RCVTSTAMPNS); |
621 | } | |
e71a4783 SH |
622 | break; |
623 | ||
624 | case SO_RCVLOWAT: | |
625 | if (val < 0) | |
626 | val = INT_MAX; | |
627 | sk->sk_rcvlowat = val ? : 1; | |
628 | break; | |
629 | ||
630 | case SO_RCVTIMEO: | |
631 | ret = sock_set_timeout(&sk->sk_rcvtimeo, optval, optlen); | |
632 | break; | |
633 | ||
634 | case SO_SNDTIMEO: | |
635 | ret = sock_set_timeout(&sk->sk_sndtimeo, optval, optlen); | |
636 | break; | |
1da177e4 | 637 | |
e71a4783 SH |
638 | case SO_ATTACH_FILTER: |
639 | ret = -EINVAL; | |
640 | if (optlen == sizeof(struct sock_fprog)) { | |
641 | struct sock_fprog fprog; | |
1da177e4 | 642 | |
e71a4783 SH |
643 | ret = -EFAULT; |
644 | if (copy_from_user(&fprog, optval, sizeof(fprog))) | |
1da177e4 | 645 | break; |
e71a4783 SH |
646 | |
647 | ret = sk_attach_filter(&fprog, sk); | |
648 | } | |
649 | break; | |
650 | ||
651 | case SO_DETACH_FILTER: | |
55b33325 | 652 | ret = sk_detach_filter(sk); |
e71a4783 | 653 | break; |
1da177e4 | 654 | |
e71a4783 SH |
655 | case SO_PASSSEC: |
656 | if (valbool) | |
657 | set_bit(SOCK_PASSSEC, &sock->flags); | |
658 | else | |
659 | clear_bit(SOCK_PASSSEC, &sock->flags); | |
660 | break; | |
4a19ec58 LAT |
661 | case SO_MARK: |
662 | if (!capable(CAP_NET_ADMIN)) | |
663 | ret = -EPERM; | |
664 | else { | |
665 | sk->sk_mark = val; | |
666 | } | |
667 | break; | |
877ce7c1 | 668 | |
1da177e4 LT |
669 | /* We implement the SO_SNDLOWAT etc to |
670 | not be settable (1003.1g 5.3) */ | |
e71a4783 SH |
671 | default: |
672 | ret = -ENOPROTOOPT; | |
673 | break; | |
4ec93edb | 674 | } |
1da177e4 LT |
675 | release_sock(sk); |
676 | return ret; | |
677 | } | |
678 | ||
679 | ||
680 | int sock_getsockopt(struct socket *sock, int level, int optname, | |
681 | char __user *optval, int __user *optlen) | |
682 | { | |
683 | struct sock *sk = sock->sk; | |
4ec93edb | 684 | |
e71a4783 | 685 | union { |
4ec93edb YH |
686 | int val; |
687 | struct linger ling; | |
1da177e4 LT |
688 | struct timeval tm; |
689 | } v; | |
4ec93edb | 690 | |
1da177e4 LT |
691 | unsigned int lv = sizeof(int); |
692 | int len; | |
4ec93edb | 693 | |
e71a4783 | 694 | if (get_user(len, optlen)) |
4ec93edb | 695 | return -EFAULT; |
e71a4783 | 696 | if (len < 0) |
1da177e4 | 697 | return -EINVAL; |
4ec93edb | 698 | |
e71a4783 SH |
699 | switch(optname) { |
700 | case SO_DEBUG: | |
701 | v.val = sock_flag(sk, SOCK_DBG); | |
702 | break; | |
703 | ||
704 | case SO_DONTROUTE: | |
705 | v.val = sock_flag(sk, SOCK_LOCALROUTE); | |
706 | break; | |
707 | ||
708 | case SO_BROADCAST: | |
709 | v.val = !!sock_flag(sk, SOCK_BROADCAST); | |
710 | break; | |
711 | ||
712 | case SO_SNDBUF: | |
713 | v.val = sk->sk_sndbuf; | |
714 | break; | |
715 | ||
716 | case SO_RCVBUF: | |
717 | v.val = sk->sk_rcvbuf; | |
718 | break; | |
719 | ||
720 | case SO_REUSEADDR: | |
721 | v.val = sk->sk_reuse; | |
722 | break; | |
723 | ||
724 | case SO_KEEPALIVE: | |
725 | v.val = !!sock_flag(sk, SOCK_KEEPOPEN); | |
726 | break; | |
727 | ||
728 | case SO_TYPE: | |
729 | v.val = sk->sk_type; | |
730 | break; | |
731 | ||
732 | case SO_ERROR: | |
733 | v.val = -sock_error(sk); | |
734 | if (v.val==0) | |
735 | v.val = xchg(&sk->sk_err_soft, 0); | |
736 | break; | |
737 | ||
738 | case SO_OOBINLINE: | |
739 | v.val = !!sock_flag(sk, SOCK_URGINLINE); | |
740 | break; | |
741 | ||
742 | case SO_NO_CHECK: | |
743 | v.val = sk->sk_no_check; | |
744 | break; | |
745 | ||
746 | case SO_PRIORITY: | |
747 | v.val = sk->sk_priority; | |
748 | break; | |
749 | ||
750 | case SO_LINGER: | |
751 | lv = sizeof(v.ling); | |
752 | v.ling.l_onoff = !!sock_flag(sk, SOCK_LINGER); | |
753 | v.ling.l_linger = sk->sk_lingertime / HZ; | |
754 | break; | |
755 | ||
756 | case SO_BSDCOMPAT: | |
757 | sock_warn_obsolete_bsdism("getsockopt"); | |
758 | break; | |
759 | ||
760 | case SO_TIMESTAMP: | |
92f37fd2 ED |
761 | v.val = sock_flag(sk, SOCK_RCVTSTAMP) && |
762 | !sock_flag(sk, SOCK_RCVTSTAMPNS); | |
763 | break; | |
764 | ||
765 | case SO_TIMESTAMPNS: | |
766 | v.val = sock_flag(sk, SOCK_RCVTSTAMPNS); | |
e71a4783 SH |
767 | break; |
768 | ||
769 | case SO_RCVTIMEO: | |
770 | lv=sizeof(struct timeval); | |
771 | if (sk->sk_rcvtimeo == MAX_SCHEDULE_TIMEOUT) { | |
772 | v.tm.tv_sec = 0; | |
773 | v.tm.tv_usec = 0; | |
774 | } else { | |
775 | v.tm.tv_sec = sk->sk_rcvtimeo / HZ; | |
776 | v.tm.tv_usec = ((sk->sk_rcvtimeo % HZ) * 1000000) / HZ; | |
777 | } | |
778 | break; | |
779 | ||
780 | case SO_SNDTIMEO: | |
781 | lv=sizeof(struct timeval); | |
782 | if (sk->sk_sndtimeo == MAX_SCHEDULE_TIMEOUT) { | |
783 | v.tm.tv_sec = 0; | |
784 | v.tm.tv_usec = 0; | |
785 | } else { | |
786 | v.tm.tv_sec = sk->sk_sndtimeo / HZ; | |
787 | v.tm.tv_usec = ((sk->sk_sndtimeo % HZ) * 1000000) / HZ; | |
788 | } | |
789 | break; | |
1da177e4 | 790 | |
e71a4783 SH |
791 | case SO_RCVLOWAT: |
792 | v.val = sk->sk_rcvlowat; | |
793 | break; | |
1da177e4 | 794 | |
e71a4783 SH |
795 | case SO_SNDLOWAT: |
796 | v.val=1; | |
797 | break; | |
1da177e4 | 798 | |
e71a4783 SH |
799 | case SO_PASSCRED: |
800 | v.val = test_bit(SOCK_PASSCRED, &sock->flags) ? 1 : 0; | |
801 | break; | |
1da177e4 | 802 | |
e71a4783 SH |
803 | case SO_PEERCRED: |
804 | if (len > sizeof(sk->sk_peercred)) | |
805 | len = sizeof(sk->sk_peercred); | |
806 | if (copy_to_user(optval, &sk->sk_peercred, len)) | |
807 | return -EFAULT; | |
808 | goto lenout; | |
1da177e4 | 809 | |
e71a4783 SH |
810 | case SO_PEERNAME: |
811 | { | |
812 | char address[128]; | |
813 | ||
814 | if (sock->ops->getname(sock, (struct sockaddr *)address, &lv, 2)) | |
815 | return -ENOTCONN; | |
816 | if (lv < len) | |
817 | return -EINVAL; | |
818 | if (copy_to_user(optval, address, len)) | |
819 | return -EFAULT; | |
820 | goto lenout; | |
821 | } | |
1da177e4 | 822 | |
e71a4783 SH |
823 | /* Dubious BSD thing... Probably nobody even uses it, but |
824 | * the UNIX standard wants it for whatever reason... -DaveM | |
825 | */ | |
826 | case SO_ACCEPTCONN: | |
827 | v.val = sk->sk_state == TCP_LISTEN; | |
828 | break; | |
1da177e4 | 829 | |
e71a4783 SH |
830 | case SO_PASSSEC: |
831 | v.val = test_bit(SOCK_PASSSEC, &sock->flags) ? 1 : 0; | |
832 | break; | |
877ce7c1 | 833 | |
e71a4783 SH |
834 | case SO_PEERSEC: |
835 | return security_socket_getpeersec_stream(sock, optval, optlen, len); | |
1da177e4 | 836 | |
4a19ec58 LAT |
837 | case SO_MARK: |
838 | v.val = sk->sk_mark; | |
839 | break; | |
840 | ||
e71a4783 SH |
841 | default: |
842 | return -ENOPROTOOPT; | |
1da177e4 | 843 | } |
e71a4783 | 844 | |
1da177e4 LT |
845 | if (len > lv) |
846 | len = lv; | |
847 | if (copy_to_user(optval, &v, len)) | |
848 | return -EFAULT; | |
849 | lenout: | |
4ec93edb YH |
850 | if (put_user(len, optlen)) |
851 | return -EFAULT; | |
852 | return 0; | |
1da177e4 LT |
853 | } |
854 | ||
a5b5bb9a IM |
855 | /* |
856 | * Initialize an sk_lock. | |
857 | * | |
858 | * (We also register the sk_lock with the lock validator.) | |
859 | */ | |
b6f99a21 | 860 | static inline void sock_lock_init(struct sock *sk) |
a5b5bb9a | 861 | { |
ed07536e PZ |
862 | sock_lock_init_class_and_name(sk, |
863 | af_family_slock_key_strings[sk->sk_family], | |
864 | af_family_slock_keys + sk->sk_family, | |
865 | af_family_key_strings[sk->sk_family], | |
866 | af_family_keys + sk->sk_family); | |
a5b5bb9a IM |
867 | } |
868 | ||
f1a6c4da PE |
869 | static void sock_copy(struct sock *nsk, const struct sock *osk) |
870 | { | |
871 | #ifdef CONFIG_SECURITY_NETWORK | |
872 | void *sptr = nsk->sk_security; | |
873 | #endif | |
874 | ||
875 | memcpy(nsk, osk, osk->sk_prot->obj_size); | |
f1a6c4da PE |
876 | #ifdef CONFIG_SECURITY_NETWORK |
877 | nsk->sk_security = sptr; | |
878 | security_sk_clone(osk, nsk); | |
879 | #endif | |
880 | } | |
881 | ||
2e4afe7b PE |
882 | static struct sock *sk_prot_alloc(struct proto *prot, gfp_t priority, |
883 | int family) | |
c308c1b2 PE |
884 | { |
885 | struct sock *sk; | |
886 | struct kmem_cache *slab; | |
887 | ||
888 | slab = prot->slab; | |
889 | if (slab != NULL) | |
890 | sk = kmem_cache_alloc(slab, priority); | |
891 | else | |
892 | sk = kmalloc(prot->obj_size, priority); | |
893 | ||
2e4afe7b PE |
894 | if (sk != NULL) { |
895 | if (security_sk_alloc(sk, family, priority)) | |
896 | goto out_free; | |
897 | ||
898 | if (!try_module_get(prot->owner)) | |
899 | goto out_free_sec; | |
900 | } | |
901 | ||
c308c1b2 | 902 | return sk; |
2e4afe7b PE |
903 | |
904 | out_free_sec: | |
905 | security_sk_free(sk); | |
906 | out_free: | |
907 | if (slab != NULL) | |
908 | kmem_cache_free(slab, sk); | |
909 | else | |
910 | kfree(sk); | |
911 | return NULL; | |
c308c1b2 PE |
912 | } |
913 | ||
914 | static void sk_prot_free(struct proto *prot, struct sock *sk) | |
915 | { | |
916 | struct kmem_cache *slab; | |
2e4afe7b | 917 | struct module *owner; |
c308c1b2 | 918 | |
2e4afe7b | 919 | owner = prot->owner; |
c308c1b2 | 920 | slab = prot->slab; |
2e4afe7b PE |
921 | |
922 | security_sk_free(sk); | |
c308c1b2 PE |
923 | if (slab != NULL) |
924 | kmem_cache_free(slab, sk); | |
925 | else | |
926 | kfree(sk); | |
2e4afe7b | 927 | module_put(owner); |
c308c1b2 PE |
928 | } |
929 | ||
1da177e4 LT |
930 | /** |
931 | * sk_alloc - All socket objects are allocated here | |
c4ea43c5 | 932 | * @net: the applicable net namespace |
4dc3b16b PP |
933 | * @family: protocol family |
934 | * @priority: for allocation (%GFP_KERNEL, %GFP_ATOMIC, etc) | |
935 | * @prot: struct proto associated with this new sock instance | |
1da177e4 | 936 | */ |
1b8d7ae4 | 937 | struct sock *sk_alloc(struct net *net, int family, gfp_t priority, |
6257ff21 | 938 | struct proto *prot) |
1da177e4 | 939 | { |
c308c1b2 | 940 | struct sock *sk; |
1da177e4 | 941 | |
154adbc8 | 942 | sk = sk_prot_alloc(prot, priority | __GFP_ZERO, family); |
1da177e4 | 943 | if (sk) { |
154adbc8 PE |
944 | sk->sk_family = family; |
945 | /* | |
946 | * See comment in struct sock definition to understand | |
947 | * why we need sk_prot_creator -acme | |
948 | */ | |
949 | sk->sk_prot = sk->sk_prot_creator = prot; | |
950 | sock_lock_init(sk); | |
3b1e0a65 | 951 | sock_net_set(sk, get_net(net)); |
1da177e4 | 952 | } |
a79af59e | 953 | |
2e4afe7b | 954 | return sk; |
1da177e4 LT |
955 | } |
956 | ||
957 | void sk_free(struct sock *sk) | |
958 | { | |
959 | struct sk_filter *filter; | |
1da177e4 LT |
960 | |
961 | if (sk->sk_destruct) | |
962 | sk->sk_destruct(sk); | |
963 | ||
fda9ef5d | 964 | filter = rcu_dereference(sk->sk_filter); |
1da177e4 | 965 | if (filter) { |
309dd5fc | 966 | sk_filter_uncharge(sk, filter); |
fda9ef5d | 967 | rcu_assign_pointer(sk->sk_filter, NULL); |
1da177e4 LT |
968 | } |
969 | ||
970 | sock_disable_timestamp(sk); | |
971 | ||
972 | if (atomic_read(&sk->sk_omem_alloc)) | |
973 | printk(KERN_DEBUG "%s: optmem leakage (%d bytes) detected.\n", | |
0dc47877 | 974 | __func__, atomic_read(&sk->sk_omem_alloc)); |
1da177e4 | 975 | |
3b1e0a65 | 976 | put_net(sock_net(sk)); |
c308c1b2 | 977 | sk_prot_free(sk->sk_prot_creator, sk); |
1da177e4 LT |
978 | } |
979 | ||
edf02087 DL |
980 | /* |
981 | * Last sock_put should drop referrence to sk->sk_net. It has already | |
982 | * been dropped in sk_change_net. Taking referrence to stopping namespace | |
983 | * is not an option. | |
984 | * Take referrence to a socket to remove it from hash _alive_ and after that | |
985 | * destroy it in the context of init_net. | |
986 | */ | |
987 | void sk_release_kernel(struct sock *sk) | |
988 | { | |
989 | if (sk == NULL || sk->sk_socket == NULL) | |
990 | return; | |
991 | ||
992 | sock_hold(sk); | |
993 | sock_release(sk->sk_socket); | |
65a18ec5 | 994 | release_net(sock_net(sk)); |
3b1e0a65 | 995 | sock_net_set(sk, get_net(&init_net)); |
edf02087 DL |
996 | sock_put(sk); |
997 | } | |
45af1754 | 998 | EXPORT_SYMBOL(sk_release_kernel); |
edf02087 | 999 | |
dd0fc66f | 1000 | struct sock *sk_clone(const struct sock *sk, const gfp_t priority) |
87d11ceb | 1001 | { |
8fd1d178 | 1002 | struct sock *newsk; |
87d11ceb | 1003 | |
8fd1d178 | 1004 | newsk = sk_prot_alloc(sk->sk_prot, priority, sk->sk_family); |
87d11ceb ACM |
1005 | if (newsk != NULL) { |
1006 | struct sk_filter *filter; | |
1007 | ||
892c141e | 1008 | sock_copy(newsk, sk); |
87d11ceb ACM |
1009 | |
1010 | /* SANITY */ | |
3b1e0a65 | 1011 | get_net(sock_net(newsk)); |
87d11ceb ACM |
1012 | sk_node_init(&newsk->sk_node); |
1013 | sock_lock_init(newsk); | |
1014 | bh_lock_sock(newsk); | |
fa438ccf | 1015 | newsk->sk_backlog.head = newsk->sk_backlog.tail = NULL; |
87d11ceb ACM |
1016 | |
1017 | atomic_set(&newsk->sk_rmem_alloc, 0); | |
1018 | atomic_set(&newsk->sk_wmem_alloc, 0); | |
1019 | atomic_set(&newsk->sk_omem_alloc, 0); | |
1020 | skb_queue_head_init(&newsk->sk_receive_queue); | |
1021 | skb_queue_head_init(&newsk->sk_write_queue); | |
97fc2f08 CL |
1022 | #ifdef CONFIG_NET_DMA |
1023 | skb_queue_head_init(&newsk->sk_async_wait_queue); | |
1024 | #endif | |
87d11ceb ACM |
1025 | |
1026 | rwlock_init(&newsk->sk_dst_lock); | |
1027 | rwlock_init(&newsk->sk_callback_lock); | |
443aef0e PZ |
1028 | lockdep_set_class_and_name(&newsk->sk_callback_lock, |
1029 | af_callback_keys + newsk->sk_family, | |
1030 | af_family_clock_key_strings[newsk->sk_family]); | |
87d11ceb ACM |
1031 | |
1032 | newsk->sk_dst_cache = NULL; | |
1033 | newsk->sk_wmem_queued = 0; | |
1034 | newsk->sk_forward_alloc = 0; | |
1035 | newsk->sk_send_head = NULL; | |
87d11ceb ACM |
1036 | newsk->sk_userlocks = sk->sk_userlocks & ~SOCK_BINDPORT_LOCK; |
1037 | ||
1038 | sock_reset_flag(newsk, SOCK_DONE); | |
1039 | skb_queue_head_init(&newsk->sk_error_queue); | |
1040 | ||
1041 | filter = newsk->sk_filter; | |
1042 | if (filter != NULL) | |
1043 | sk_filter_charge(newsk, filter); | |
1044 | ||
1045 | if (unlikely(xfrm_sk_clone_policy(newsk))) { | |
1046 | /* It is still raw copy of parent, so invalidate | |
1047 | * destructor and make plain sk_free() */ | |
1048 | newsk->sk_destruct = NULL; | |
1049 | sk_free(newsk); | |
1050 | newsk = NULL; | |
1051 | goto out; | |
1052 | } | |
1053 | ||
1054 | newsk->sk_err = 0; | |
1055 | newsk->sk_priority = 0; | |
1056 | atomic_set(&newsk->sk_refcnt, 2); | |
1057 | ||
1058 | /* | |
1059 | * Increment the counter in the same struct proto as the master | |
1060 | * sock (sk_refcnt_debug_inc uses newsk->sk_prot->socks, that | |
1061 | * is the same as sk->sk_prot->socks, as this field was copied | |
1062 | * with memcpy). | |
1063 | * | |
1064 | * This _changes_ the previous behaviour, where | |
1065 | * tcp_create_openreq_child always was incrementing the | |
1066 | * equivalent to tcp_prot->socks (inet_sock_nr), so this have | |
1067 | * to be taken into account in all callers. -acme | |
1068 | */ | |
1069 | sk_refcnt_debug_inc(newsk); | |
972692e0 | 1070 | sk_set_socket(newsk, NULL); |
87d11ceb ACM |
1071 | newsk->sk_sleep = NULL; |
1072 | ||
1073 | if (newsk->sk_prot->sockets_allocated) | |
1074 | atomic_inc(newsk->sk_prot->sockets_allocated); | |
1075 | } | |
1076 | out: | |
1077 | return newsk; | |
1078 | } | |
1079 | ||
1080 | EXPORT_SYMBOL_GPL(sk_clone); | |
1081 | ||
9958089a AK |
1082 | void sk_setup_caps(struct sock *sk, struct dst_entry *dst) |
1083 | { | |
1084 | __sk_dst_set(sk, dst); | |
1085 | sk->sk_route_caps = dst->dev->features; | |
1086 | if (sk->sk_route_caps & NETIF_F_GSO) | |
4fcd6b99 | 1087 | sk->sk_route_caps |= NETIF_F_GSO_SOFTWARE; |
9958089a | 1088 | if (sk_can_gso(sk)) { |
82cc1a7a | 1089 | if (dst->header_len) { |
9958089a | 1090 | sk->sk_route_caps &= ~NETIF_F_GSO_MASK; |
82cc1a7a | 1091 | } else { |
9958089a | 1092 | sk->sk_route_caps |= NETIF_F_SG | NETIF_F_HW_CSUM; |
82cc1a7a PWJ |
1093 | sk->sk_gso_max_size = dst->dev->gso_max_size; |
1094 | } | |
9958089a AK |
1095 | } |
1096 | } | |
1097 | EXPORT_SYMBOL_GPL(sk_setup_caps); | |
1098 | ||
1da177e4 LT |
1099 | void __init sk_init(void) |
1100 | { | |
1101 | if (num_physpages <= 4096) { | |
1102 | sysctl_wmem_max = 32767; | |
1103 | sysctl_rmem_max = 32767; | |
1104 | sysctl_wmem_default = 32767; | |
1105 | sysctl_rmem_default = 32767; | |
1106 | } else if (num_physpages >= 131072) { | |
1107 | sysctl_wmem_max = 131071; | |
1108 | sysctl_rmem_max = 131071; | |
1109 | } | |
1110 | } | |
1111 | ||
1112 | /* | |
1113 | * Simple resource managers for sockets. | |
1114 | */ | |
1115 | ||
1116 | ||
4ec93edb YH |
1117 | /* |
1118 | * Write buffer destructor automatically called from kfree_skb. | |
1da177e4 LT |
1119 | */ |
1120 | void sock_wfree(struct sk_buff *skb) | |
1121 | { | |
1122 | struct sock *sk = skb->sk; | |
1123 | ||
1124 | /* In case it might be waiting for more memory. */ | |
1125 | atomic_sub(skb->truesize, &sk->sk_wmem_alloc); | |
1126 | if (!sock_flag(sk, SOCK_USE_WRITE_QUEUE)) | |
1127 | sk->sk_write_space(sk); | |
1128 | sock_put(sk); | |
1129 | } | |
1130 | ||
4ec93edb YH |
1131 | /* |
1132 | * Read buffer destructor automatically called from kfree_skb. | |
1da177e4 LT |
1133 | */ |
1134 | void sock_rfree(struct sk_buff *skb) | |
1135 | { | |
1136 | struct sock *sk = skb->sk; | |
1137 | ||
3ab224be | 1138 | skb_truesize_check(skb); |
1da177e4 | 1139 | atomic_sub(skb->truesize, &sk->sk_rmem_alloc); |
3ab224be | 1140 | sk_mem_uncharge(skb->sk, skb->truesize); |
1da177e4 LT |
1141 | } |
1142 | ||
1143 | ||
1144 | int sock_i_uid(struct sock *sk) | |
1145 | { | |
1146 | int uid; | |
1147 | ||
1148 | read_lock(&sk->sk_callback_lock); | |
1149 | uid = sk->sk_socket ? SOCK_INODE(sk->sk_socket)->i_uid : 0; | |
1150 | read_unlock(&sk->sk_callback_lock); | |
1151 | return uid; | |
1152 | } | |
1153 | ||
1154 | unsigned long sock_i_ino(struct sock *sk) | |
1155 | { | |
1156 | unsigned long ino; | |
1157 | ||
1158 | read_lock(&sk->sk_callback_lock); | |
1159 | ino = sk->sk_socket ? SOCK_INODE(sk->sk_socket)->i_ino : 0; | |
1160 | read_unlock(&sk->sk_callback_lock); | |
1161 | return ino; | |
1162 | } | |
1163 | ||
1164 | /* | |
1165 | * Allocate a skb from the socket's send buffer. | |
1166 | */ | |
86a76caf | 1167 | struct sk_buff *sock_wmalloc(struct sock *sk, unsigned long size, int force, |
dd0fc66f | 1168 | gfp_t priority) |
1da177e4 LT |
1169 | { |
1170 | if (force || atomic_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf) { | |
1171 | struct sk_buff * skb = alloc_skb(size, priority); | |
1172 | if (skb) { | |
1173 | skb_set_owner_w(skb, sk); | |
1174 | return skb; | |
1175 | } | |
1176 | } | |
1177 | return NULL; | |
1178 | } | |
1179 | ||
1180 | /* | |
1181 | * Allocate a skb from the socket's receive buffer. | |
4ec93edb | 1182 | */ |
86a76caf | 1183 | struct sk_buff *sock_rmalloc(struct sock *sk, unsigned long size, int force, |
dd0fc66f | 1184 | gfp_t priority) |
1da177e4 LT |
1185 | { |
1186 | if (force || atomic_read(&sk->sk_rmem_alloc) < sk->sk_rcvbuf) { | |
1187 | struct sk_buff *skb = alloc_skb(size, priority); | |
1188 | if (skb) { | |
1189 | skb_set_owner_r(skb, sk); | |
1190 | return skb; | |
1191 | } | |
1192 | } | |
1193 | return NULL; | |
1194 | } | |
1195 | ||
4ec93edb | 1196 | /* |
1da177e4 | 1197 | * Allocate a memory block from the socket's option memory buffer. |
4ec93edb | 1198 | */ |
dd0fc66f | 1199 | void *sock_kmalloc(struct sock *sk, int size, gfp_t priority) |
1da177e4 LT |
1200 | { |
1201 | if ((unsigned)size <= sysctl_optmem_max && | |
1202 | atomic_read(&sk->sk_omem_alloc) + size < sysctl_optmem_max) { | |
1203 | void *mem; | |
1204 | /* First do the add, to avoid the race if kmalloc | |
4ec93edb | 1205 | * might sleep. |
1da177e4 LT |
1206 | */ |
1207 | atomic_add(size, &sk->sk_omem_alloc); | |
1208 | mem = kmalloc(size, priority); | |
1209 | if (mem) | |
1210 | return mem; | |
1211 | atomic_sub(size, &sk->sk_omem_alloc); | |
1212 | } | |
1213 | return NULL; | |
1214 | } | |
1215 | ||
1216 | /* | |
1217 | * Free an option memory block. | |
1218 | */ | |
1219 | void sock_kfree_s(struct sock *sk, void *mem, int size) | |
1220 | { | |
1221 | kfree(mem); | |
1222 | atomic_sub(size, &sk->sk_omem_alloc); | |
1223 | } | |
1224 | ||
1225 | /* It is almost wait_for_tcp_memory minus release_sock/lock_sock. | |
1226 | I think, these locks should be removed for datagram sockets. | |
1227 | */ | |
1228 | static long sock_wait_for_wmem(struct sock * sk, long timeo) | |
1229 | { | |
1230 | DEFINE_WAIT(wait); | |
1231 | ||
1232 | clear_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags); | |
1233 | for (;;) { | |
1234 | if (!timeo) | |
1235 | break; | |
1236 | if (signal_pending(current)) | |
1237 | break; | |
1238 | set_bit(SOCK_NOSPACE, &sk->sk_socket->flags); | |
1239 | prepare_to_wait(sk->sk_sleep, &wait, TASK_INTERRUPTIBLE); | |
1240 | if (atomic_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf) | |
1241 | break; | |
1242 | if (sk->sk_shutdown & SEND_SHUTDOWN) | |
1243 | break; | |
1244 | if (sk->sk_err) | |
1245 | break; | |
1246 | timeo = schedule_timeout(timeo); | |
1247 | } | |
1248 | finish_wait(sk->sk_sleep, &wait); | |
1249 | return timeo; | |
1250 | } | |
1251 | ||
1252 | ||
1253 | /* | |
1254 | * Generic send/receive buffer handlers | |
1255 | */ | |
1256 | ||
1257 | static struct sk_buff *sock_alloc_send_pskb(struct sock *sk, | |
1258 | unsigned long header_len, | |
1259 | unsigned long data_len, | |
1260 | int noblock, int *errcode) | |
1261 | { | |
1262 | struct sk_buff *skb; | |
7d877f3b | 1263 | gfp_t gfp_mask; |
1da177e4 LT |
1264 | long timeo; |
1265 | int err; | |
1266 | ||
1267 | gfp_mask = sk->sk_allocation; | |
1268 | if (gfp_mask & __GFP_WAIT) | |
1269 | gfp_mask |= __GFP_REPEAT; | |
1270 | ||
1271 | timeo = sock_sndtimeo(sk, noblock); | |
1272 | while (1) { | |
1273 | err = sock_error(sk); | |
1274 | if (err != 0) | |
1275 | goto failure; | |
1276 | ||
1277 | err = -EPIPE; | |
1278 | if (sk->sk_shutdown & SEND_SHUTDOWN) | |
1279 | goto failure; | |
1280 | ||
1281 | if (atomic_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf) { | |
db38c179 | 1282 | skb = alloc_skb(header_len, gfp_mask); |
1da177e4 LT |
1283 | if (skb) { |
1284 | int npages; | |
1285 | int i; | |
1286 | ||
1287 | /* No pages, we're done... */ | |
1288 | if (!data_len) | |
1289 | break; | |
1290 | ||
1291 | npages = (data_len + (PAGE_SIZE - 1)) >> PAGE_SHIFT; | |
1292 | skb->truesize += data_len; | |
1293 | skb_shinfo(skb)->nr_frags = npages; | |
1294 | for (i = 0; i < npages; i++) { | |
1295 | struct page *page; | |
1296 | skb_frag_t *frag; | |
1297 | ||
1298 | page = alloc_pages(sk->sk_allocation, 0); | |
1299 | if (!page) { | |
1300 | err = -ENOBUFS; | |
1301 | skb_shinfo(skb)->nr_frags = i; | |
1302 | kfree_skb(skb); | |
1303 | goto failure; | |
1304 | } | |
1305 | ||
1306 | frag = &skb_shinfo(skb)->frags[i]; | |
1307 | frag->page = page; | |
1308 | frag->page_offset = 0; | |
1309 | frag->size = (data_len >= PAGE_SIZE ? | |
1310 | PAGE_SIZE : | |
1311 | data_len); | |
1312 | data_len -= PAGE_SIZE; | |
1313 | } | |
1314 | ||
1315 | /* Full success... */ | |
1316 | break; | |
1317 | } | |
1318 | err = -ENOBUFS; | |
1319 | goto failure; | |
1320 | } | |
1321 | set_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags); | |
1322 | set_bit(SOCK_NOSPACE, &sk->sk_socket->flags); | |
1323 | err = -EAGAIN; | |
1324 | if (!timeo) | |
1325 | goto failure; | |
1326 | if (signal_pending(current)) | |
1327 | goto interrupted; | |
1328 | timeo = sock_wait_for_wmem(sk, timeo); | |
1329 | } | |
1330 | ||
1331 | skb_set_owner_w(skb, sk); | |
1332 | return skb; | |
1333 | ||
1334 | interrupted: | |
1335 | err = sock_intr_errno(timeo); | |
1336 | failure: | |
1337 | *errcode = err; | |
1338 | return NULL; | |
1339 | } | |
1340 | ||
4ec93edb | 1341 | struct sk_buff *sock_alloc_send_skb(struct sock *sk, unsigned long size, |
1da177e4 LT |
1342 | int noblock, int *errcode) |
1343 | { | |
1344 | return sock_alloc_send_pskb(sk, size, 0, noblock, errcode); | |
1345 | } | |
1346 | ||
1347 | static void __lock_sock(struct sock *sk) | |
1348 | { | |
1349 | DEFINE_WAIT(wait); | |
1350 | ||
e71a4783 | 1351 | for (;;) { |
1da177e4 LT |
1352 | prepare_to_wait_exclusive(&sk->sk_lock.wq, &wait, |
1353 | TASK_UNINTERRUPTIBLE); | |
1354 | spin_unlock_bh(&sk->sk_lock.slock); | |
1355 | schedule(); | |
1356 | spin_lock_bh(&sk->sk_lock.slock); | |
e71a4783 | 1357 | if (!sock_owned_by_user(sk)) |
1da177e4 LT |
1358 | break; |
1359 | } | |
1360 | finish_wait(&sk->sk_lock.wq, &wait); | |
1361 | } | |
1362 | ||
1363 | static void __release_sock(struct sock *sk) | |
1364 | { | |
1365 | struct sk_buff *skb = sk->sk_backlog.head; | |
1366 | ||
1367 | do { | |
1368 | sk->sk_backlog.head = sk->sk_backlog.tail = NULL; | |
1369 | bh_unlock_sock(sk); | |
1370 | ||
1371 | do { | |
1372 | struct sk_buff *next = skb->next; | |
1373 | ||
1374 | skb->next = NULL; | |
c57943a1 | 1375 | sk_backlog_rcv(sk, skb); |
1da177e4 LT |
1376 | |
1377 | /* | |
1378 | * We are in process context here with softirqs | |
1379 | * disabled, use cond_resched_softirq() to preempt. | |
1380 | * This is safe to do because we've taken the backlog | |
1381 | * queue private: | |
1382 | */ | |
1383 | cond_resched_softirq(); | |
1384 | ||
1385 | skb = next; | |
1386 | } while (skb != NULL); | |
1387 | ||
1388 | bh_lock_sock(sk); | |
e71a4783 | 1389 | } while ((skb = sk->sk_backlog.head) != NULL); |
1da177e4 LT |
1390 | } |
1391 | ||
1392 | /** | |
1393 | * sk_wait_data - wait for data to arrive at sk_receive_queue | |
4dc3b16b PP |
1394 | * @sk: sock to wait on |
1395 | * @timeo: for how long | |
1da177e4 LT |
1396 | * |
1397 | * Now socket state including sk->sk_err is changed only under lock, | |
1398 | * hence we may omit checks after joining wait queue. | |
1399 | * We check receive queue before schedule() only as optimization; | |
1400 | * it is very likely that release_sock() added new data. | |
1401 | */ | |
1402 | int sk_wait_data(struct sock *sk, long *timeo) | |
1403 | { | |
1404 | int rc; | |
1405 | DEFINE_WAIT(wait); | |
1406 | ||
1407 | prepare_to_wait(sk->sk_sleep, &wait, TASK_INTERRUPTIBLE); | |
1408 | set_bit(SOCK_ASYNC_WAITDATA, &sk->sk_socket->flags); | |
1409 | rc = sk_wait_event(sk, timeo, !skb_queue_empty(&sk->sk_receive_queue)); | |
1410 | clear_bit(SOCK_ASYNC_WAITDATA, &sk->sk_socket->flags); | |
1411 | finish_wait(sk->sk_sleep, &wait); | |
1412 | return rc; | |
1413 | } | |
1414 | ||
1415 | EXPORT_SYMBOL(sk_wait_data); | |
1416 | ||
3ab224be HA |
1417 | /** |
1418 | * __sk_mem_schedule - increase sk_forward_alloc and memory_allocated | |
1419 | * @sk: socket | |
1420 | * @size: memory size to allocate | |
1421 | * @kind: allocation type | |
1422 | * | |
1423 | * If kind is SK_MEM_SEND, it means wmem allocation. Otherwise it means | |
1424 | * rmem allocation. This function assumes that protocols which have | |
1425 | * memory_pressure use sk_wmem_queued as write buffer accounting. | |
1426 | */ | |
1427 | int __sk_mem_schedule(struct sock *sk, int size, int kind) | |
1428 | { | |
1429 | struct proto *prot = sk->sk_prot; | |
1430 | int amt = sk_mem_pages(size); | |
1431 | int allocated; | |
1432 | ||
1433 | sk->sk_forward_alloc += amt * SK_MEM_QUANTUM; | |
1434 | allocated = atomic_add_return(amt, prot->memory_allocated); | |
1435 | ||
1436 | /* Under limit. */ | |
1437 | if (allocated <= prot->sysctl_mem[0]) { | |
1438 | if (prot->memory_pressure && *prot->memory_pressure) | |
1439 | *prot->memory_pressure = 0; | |
1440 | return 1; | |
1441 | } | |
1442 | ||
1443 | /* Under pressure. */ | |
1444 | if (allocated > prot->sysctl_mem[1]) | |
1445 | if (prot->enter_memory_pressure) | |
5c52ba17 | 1446 | prot->enter_memory_pressure(sk); |
3ab224be HA |
1447 | |
1448 | /* Over hard limit. */ | |
1449 | if (allocated > prot->sysctl_mem[2]) | |
1450 | goto suppress_allocation; | |
1451 | ||
1452 | /* guarantee minimum buffer size under pressure */ | |
1453 | if (kind == SK_MEM_RECV) { | |
1454 | if (atomic_read(&sk->sk_rmem_alloc) < prot->sysctl_rmem[0]) | |
1455 | return 1; | |
1456 | } else { /* SK_MEM_SEND */ | |
1457 | if (sk->sk_type == SOCK_STREAM) { | |
1458 | if (sk->sk_wmem_queued < prot->sysctl_wmem[0]) | |
1459 | return 1; | |
1460 | } else if (atomic_read(&sk->sk_wmem_alloc) < | |
1461 | prot->sysctl_wmem[0]) | |
1462 | return 1; | |
1463 | } | |
1464 | ||
1465 | if (prot->memory_pressure) { | |
1466 | if (!*prot->memory_pressure || | |
1467 | prot->sysctl_mem[2] > atomic_read(prot->sockets_allocated) * | |
1468 | sk_mem_pages(sk->sk_wmem_queued + | |
1469 | atomic_read(&sk->sk_rmem_alloc) + | |
1470 | sk->sk_forward_alloc)) | |
1471 | return 1; | |
1472 | } | |
1473 | ||
1474 | suppress_allocation: | |
1475 | ||
1476 | if (kind == SK_MEM_SEND && sk->sk_type == SOCK_STREAM) { | |
1477 | sk_stream_moderate_sndbuf(sk); | |
1478 | ||
1479 | /* Fail only if socket is _under_ its sndbuf. | |
1480 | * In this case we cannot block, so that we have to fail. | |
1481 | */ | |
1482 | if (sk->sk_wmem_queued + size >= sk->sk_sndbuf) | |
1483 | return 1; | |
1484 | } | |
1485 | ||
1486 | /* Alas. Undo changes. */ | |
1487 | sk->sk_forward_alloc -= amt * SK_MEM_QUANTUM; | |
1488 | atomic_sub(amt, prot->memory_allocated); | |
1489 | return 0; | |
1490 | } | |
1491 | ||
1492 | EXPORT_SYMBOL(__sk_mem_schedule); | |
1493 | ||
1494 | /** | |
1495 | * __sk_reclaim - reclaim memory_allocated | |
1496 | * @sk: socket | |
1497 | */ | |
1498 | void __sk_mem_reclaim(struct sock *sk) | |
1499 | { | |
1500 | struct proto *prot = sk->sk_prot; | |
1501 | ||
680a5a50 | 1502 | atomic_sub(sk->sk_forward_alloc >> SK_MEM_QUANTUM_SHIFT, |
3ab224be HA |
1503 | prot->memory_allocated); |
1504 | sk->sk_forward_alloc &= SK_MEM_QUANTUM - 1; | |
1505 | ||
1506 | if (prot->memory_pressure && *prot->memory_pressure && | |
1507 | (atomic_read(prot->memory_allocated) < prot->sysctl_mem[0])) | |
1508 | *prot->memory_pressure = 0; | |
1509 | } | |
1510 | ||
1511 | EXPORT_SYMBOL(__sk_mem_reclaim); | |
1512 | ||
1513 | ||
1da177e4 LT |
1514 | /* |
1515 | * Set of default routines for initialising struct proto_ops when | |
1516 | * the protocol does not support a particular function. In certain | |
1517 | * cases where it makes no sense for a protocol to have a "do nothing" | |
1518 | * function, some default processing is provided. | |
1519 | */ | |
1520 | ||
1521 | int sock_no_bind(struct socket *sock, struct sockaddr *saddr, int len) | |
1522 | { | |
1523 | return -EOPNOTSUPP; | |
1524 | } | |
1525 | ||
4ec93edb | 1526 | int sock_no_connect(struct socket *sock, struct sockaddr *saddr, |
1da177e4 LT |
1527 | int len, int flags) |
1528 | { | |
1529 | return -EOPNOTSUPP; | |
1530 | } | |
1531 | ||
1532 | int sock_no_socketpair(struct socket *sock1, struct socket *sock2) | |
1533 | { | |
1534 | return -EOPNOTSUPP; | |
1535 | } | |
1536 | ||
1537 | int sock_no_accept(struct socket *sock, struct socket *newsock, int flags) | |
1538 | { | |
1539 | return -EOPNOTSUPP; | |
1540 | } | |
1541 | ||
4ec93edb | 1542 | int sock_no_getname(struct socket *sock, struct sockaddr *saddr, |
1da177e4 LT |
1543 | int *len, int peer) |
1544 | { | |
1545 | return -EOPNOTSUPP; | |
1546 | } | |
1547 | ||
1548 | unsigned int sock_no_poll(struct file * file, struct socket *sock, poll_table *pt) | |
1549 | { | |
1550 | return 0; | |
1551 | } | |
1552 | ||
1553 | int sock_no_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg) | |
1554 | { | |
1555 | return -EOPNOTSUPP; | |
1556 | } | |
1557 | ||
1558 | int sock_no_listen(struct socket *sock, int backlog) | |
1559 | { | |
1560 | return -EOPNOTSUPP; | |
1561 | } | |
1562 | ||
1563 | int sock_no_shutdown(struct socket *sock, int how) | |
1564 | { | |
1565 | return -EOPNOTSUPP; | |
1566 | } | |
1567 | ||
1568 | int sock_no_setsockopt(struct socket *sock, int level, int optname, | |
1569 | char __user *optval, int optlen) | |
1570 | { | |
1571 | return -EOPNOTSUPP; | |
1572 | } | |
1573 | ||
1574 | int sock_no_getsockopt(struct socket *sock, int level, int optname, | |
1575 | char __user *optval, int __user *optlen) | |
1576 | { | |
1577 | return -EOPNOTSUPP; | |
1578 | } | |
1579 | ||
1580 | int sock_no_sendmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *m, | |
1581 | size_t len) | |
1582 | { | |
1583 | return -EOPNOTSUPP; | |
1584 | } | |
1585 | ||
1586 | int sock_no_recvmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *m, | |
1587 | size_t len, int flags) | |
1588 | { | |
1589 | return -EOPNOTSUPP; | |
1590 | } | |
1591 | ||
1592 | int sock_no_mmap(struct file *file, struct socket *sock, struct vm_area_struct *vma) | |
1593 | { | |
1594 | /* Mirror missing mmap method error code */ | |
1595 | return -ENODEV; | |
1596 | } | |
1597 | ||
1598 | ssize_t sock_no_sendpage(struct socket *sock, struct page *page, int offset, size_t size, int flags) | |
1599 | { | |
1600 | ssize_t res; | |
1601 | struct msghdr msg = {.msg_flags = flags}; | |
1602 | struct kvec iov; | |
1603 | char *kaddr = kmap(page); | |
1604 | iov.iov_base = kaddr + offset; | |
1605 | iov.iov_len = size; | |
1606 | res = kernel_sendmsg(sock, &msg, &iov, 1, size); | |
1607 | kunmap(page); | |
1608 | return res; | |
1609 | } | |
1610 | ||
1611 | /* | |
1612 | * Default Socket Callbacks | |
1613 | */ | |
1614 | ||
1615 | static void sock_def_wakeup(struct sock *sk) | |
1616 | { | |
1617 | read_lock(&sk->sk_callback_lock); | |
1618 | if (sk->sk_sleep && waitqueue_active(sk->sk_sleep)) | |
1619 | wake_up_interruptible_all(sk->sk_sleep); | |
1620 | read_unlock(&sk->sk_callback_lock); | |
1621 | } | |
1622 | ||
1623 | static void sock_def_error_report(struct sock *sk) | |
1624 | { | |
1625 | read_lock(&sk->sk_callback_lock); | |
1626 | if (sk->sk_sleep && waitqueue_active(sk->sk_sleep)) | |
1627 | wake_up_interruptible(sk->sk_sleep); | |
8d8ad9d7 | 1628 | sk_wake_async(sk, SOCK_WAKE_IO, POLL_ERR); |
1da177e4 LT |
1629 | read_unlock(&sk->sk_callback_lock); |
1630 | } | |
1631 | ||
1632 | static void sock_def_readable(struct sock *sk, int len) | |
1633 | { | |
1634 | read_lock(&sk->sk_callback_lock); | |
1635 | if (sk->sk_sleep && waitqueue_active(sk->sk_sleep)) | |
6f3d0929 | 1636 | wake_up_interruptible_sync(sk->sk_sleep); |
8d8ad9d7 | 1637 | sk_wake_async(sk, SOCK_WAKE_WAITD, POLL_IN); |
1da177e4 LT |
1638 | read_unlock(&sk->sk_callback_lock); |
1639 | } | |
1640 | ||
1641 | static void sock_def_write_space(struct sock *sk) | |
1642 | { | |
1643 | read_lock(&sk->sk_callback_lock); | |
1644 | ||
1645 | /* Do not wake up a writer until he can make "significant" | |
1646 | * progress. --DaveM | |
1647 | */ | |
e71a4783 | 1648 | if ((atomic_read(&sk->sk_wmem_alloc) << 1) <= sk->sk_sndbuf) { |
1da177e4 | 1649 | if (sk->sk_sleep && waitqueue_active(sk->sk_sleep)) |
6f3d0929 | 1650 | wake_up_interruptible_sync(sk->sk_sleep); |
1da177e4 LT |
1651 | |
1652 | /* Should agree with poll, otherwise some programs break */ | |
1653 | if (sock_writeable(sk)) | |
8d8ad9d7 | 1654 | sk_wake_async(sk, SOCK_WAKE_SPACE, POLL_OUT); |
1da177e4 LT |
1655 | } |
1656 | ||
1657 | read_unlock(&sk->sk_callback_lock); | |
1658 | } | |
1659 | ||
1660 | static void sock_def_destruct(struct sock *sk) | |
1661 | { | |
a51482bd | 1662 | kfree(sk->sk_protinfo); |
1da177e4 LT |
1663 | } |
1664 | ||
1665 | void sk_send_sigurg(struct sock *sk) | |
1666 | { | |
1667 | if (sk->sk_socket && sk->sk_socket->file) | |
1668 | if (send_sigurg(&sk->sk_socket->file->f_owner)) | |
8d8ad9d7 | 1669 | sk_wake_async(sk, SOCK_WAKE_URG, POLL_PRI); |
1da177e4 LT |
1670 | } |
1671 | ||
1672 | void sk_reset_timer(struct sock *sk, struct timer_list* timer, | |
1673 | unsigned long expires) | |
1674 | { | |
1675 | if (!mod_timer(timer, expires)) | |
1676 | sock_hold(sk); | |
1677 | } | |
1678 | ||
1679 | EXPORT_SYMBOL(sk_reset_timer); | |
1680 | ||
1681 | void sk_stop_timer(struct sock *sk, struct timer_list* timer) | |
1682 | { | |
1683 | if (timer_pending(timer) && del_timer(timer)) | |
1684 | __sock_put(sk); | |
1685 | } | |
1686 | ||
1687 | EXPORT_SYMBOL(sk_stop_timer); | |
1688 | ||
1689 | void sock_init_data(struct socket *sock, struct sock *sk) | |
1690 | { | |
1691 | skb_queue_head_init(&sk->sk_receive_queue); | |
1692 | skb_queue_head_init(&sk->sk_write_queue); | |
1693 | skb_queue_head_init(&sk->sk_error_queue); | |
97fc2f08 CL |
1694 | #ifdef CONFIG_NET_DMA |
1695 | skb_queue_head_init(&sk->sk_async_wait_queue); | |
1696 | #endif | |
1da177e4 LT |
1697 | |
1698 | sk->sk_send_head = NULL; | |
1699 | ||
1700 | init_timer(&sk->sk_timer); | |
4ec93edb | 1701 | |
1da177e4 LT |
1702 | sk->sk_allocation = GFP_KERNEL; |
1703 | sk->sk_rcvbuf = sysctl_rmem_default; | |
1704 | sk->sk_sndbuf = sysctl_wmem_default; | |
1705 | sk->sk_state = TCP_CLOSE; | |
972692e0 | 1706 | sk_set_socket(sk, sock); |
1da177e4 LT |
1707 | |
1708 | sock_set_flag(sk, SOCK_ZAPPED); | |
1709 | ||
e71a4783 | 1710 | if (sock) { |
1da177e4 LT |
1711 | sk->sk_type = sock->type; |
1712 | sk->sk_sleep = &sock->wait; | |
1713 | sock->sk = sk; | |
1714 | } else | |
1715 | sk->sk_sleep = NULL; | |
1716 | ||
1717 | rwlock_init(&sk->sk_dst_lock); | |
1718 | rwlock_init(&sk->sk_callback_lock); | |
443aef0e PZ |
1719 | lockdep_set_class_and_name(&sk->sk_callback_lock, |
1720 | af_callback_keys + sk->sk_family, | |
1721 | af_family_clock_key_strings[sk->sk_family]); | |
1da177e4 LT |
1722 | |
1723 | sk->sk_state_change = sock_def_wakeup; | |
1724 | sk->sk_data_ready = sock_def_readable; | |
1725 | sk->sk_write_space = sock_def_write_space; | |
1726 | sk->sk_error_report = sock_def_error_report; | |
1727 | sk->sk_destruct = sock_def_destruct; | |
1728 | ||
1729 | sk->sk_sndmsg_page = NULL; | |
1730 | sk->sk_sndmsg_off = 0; | |
1731 | ||
1732 | sk->sk_peercred.pid = 0; | |
1733 | sk->sk_peercred.uid = -1; | |
1734 | sk->sk_peercred.gid = -1; | |
1735 | sk->sk_write_pending = 0; | |
1736 | sk->sk_rcvlowat = 1; | |
1737 | sk->sk_rcvtimeo = MAX_SCHEDULE_TIMEOUT; | |
1738 | sk->sk_sndtimeo = MAX_SCHEDULE_TIMEOUT; | |
1739 | ||
f37f0afb | 1740 | sk->sk_stamp = ktime_set(-1L, 0); |
1da177e4 LT |
1741 | |
1742 | atomic_set(&sk->sk_refcnt, 1); | |
33c732c3 | 1743 | atomic_set(&sk->sk_drops, 0); |
1da177e4 LT |
1744 | } |
1745 | ||
b5606c2d | 1746 | void lock_sock_nested(struct sock *sk, int subclass) |
1da177e4 LT |
1747 | { |
1748 | might_sleep(); | |
a5b5bb9a | 1749 | spin_lock_bh(&sk->sk_lock.slock); |
d2e9117c | 1750 | if (sk->sk_lock.owned) |
1da177e4 | 1751 | __lock_sock(sk); |
d2e9117c | 1752 | sk->sk_lock.owned = 1; |
a5b5bb9a IM |
1753 | spin_unlock(&sk->sk_lock.slock); |
1754 | /* | |
1755 | * The sk_lock has mutex_lock() semantics here: | |
1756 | */ | |
fcc70d5f | 1757 | mutex_acquire(&sk->sk_lock.dep_map, subclass, 0, _RET_IP_); |
a5b5bb9a | 1758 | local_bh_enable(); |
1da177e4 LT |
1759 | } |
1760 | ||
fcc70d5f | 1761 | EXPORT_SYMBOL(lock_sock_nested); |
1da177e4 | 1762 | |
b5606c2d | 1763 | void release_sock(struct sock *sk) |
1da177e4 | 1764 | { |
a5b5bb9a IM |
1765 | /* |
1766 | * The sk_lock has mutex_unlock() semantics: | |
1767 | */ | |
1768 | mutex_release(&sk->sk_lock.dep_map, 1, _RET_IP_); | |
1769 | ||
1770 | spin_lock_bh(&sk->sk_lock.slock); | |
1da177e4 LT |
1771 | if (sk->sk_backlog.tail) |
1772 | __release_sock(sk); | |
d2e9117c | 1773 | sk->sk_lock.owned = 0; |
a5b5bb9a IM |
1774 | if (waitqueue_active(&sk->sk_lock.wq)) |
1775 | wake_up(&sk->sk_lock.wq); | |
1776 | spin_unlock_bh(&sk->sk_lock.slock); | |
1da177e4 LT |
1777 | } |
1778 | EXPORT_SYMBOL(release_sock); | |
1779 | ||
1780 | int sock_get_timestamp(struct sock *sk, struct timeval __user *userstamp) | |
4ec93edb | 1781 | { |
b7aa0bf7 | 1782 | struct timeval tv; |
1da177e4 LT |
1783 | if (!sock_flag(sk, SOCK_TIMESTAMP)) |
1784 | sock_enable_timestamp(sk); | |
b7aa0bf7 ED |
1785 | tv = ktime_to_timeval(sk->sk_stamp); |
1786 | if (tv.tv_sec == -1) | |
1da177e4 | 1787 | return -ENOENT; |
b7aa0bf7 ED |
1788 | if (tv.tv_sec == 0) { |
1789 | sk->sk_stamp = ktime_get_real(); | |
1790 | tv = ktime_to_timeval(sk->sk_stamp); | |
1791 | } | |
1792 | return copy_to_user(userstamp, &tv, sizeof(tv)) ? -EFAULT : 0; | |
4ec93edb | 1793 | } |
1da177e4 LT |
1794 | EXPORT_SYMBOL(sock_get_timestamp); |
1795 | ||
ae40eb1e ED |
1796 | int sock_get_timestampns(struct sock *sk, struct timespec __user *userstamp) |
1797 | { | |
1798 | struct timespec ts; | |
1799 | if (!sock_flag(sk, SOCK_TIMESTAMP)) | |
1800 | sock_enable_timestamp(sk); | |
1801 | ts = ktime_to_timespec(sk->sk_stamp); | |
1802 | if (ts.tv_sec == -1) | |
1803 | return -ENOENT; | |
1804 | if (ts.tv_sec == 0) { | |
1805 | sk->sk_stamp = ktime_get_real(); | |
1806 | ts = ktime_to_timespec(sk->sk_stamp); | |
1807 | } | |
1808 | return copy_to_user(userstamp, &ts, sizeof(ts)) ? -EFAULT : 0; | |
1809 | } | |
1810 | EXPORT_SYMBOL(sock_get_timestampns); | |
1811 | ||
1da177e4 | 1812 | void sock_enable_timestamp(struct sock *sk) |
4ec93edb YH |
1813 | { |
1814 | if (!sock_flag(sk, SOCK_TIMESTAMP)) { | |
1da177e4 LT |
1815 | sock_set_flag(sk, SOCK_TIMESTAMP); |
1816 | net_enable_timestamp(); | |
1817 | } | |
1818 | } | |
1da177e4 LT |
1819 | |
1820 | /* | |
1821 | * Get a socket option on an socket. | |
1822 | * | |
1823 | * FIX: POSIX 1003.1g is very ambiguous here. It states that | |
1824 | * asynchronous errors should be reported by getsockopt. We assume | |
1825 | * this means if you specify SO_ERROR (otherwise whats the point of it). | |
1826 | */ | |
1827 | int sock_common_getsockopt(struct socket *sock, int level, int optname, | |
1828 | char __user *optval, int __user *optlen) | |
1829 | { | |
1830 | struct sock *sk = sock->sk; | |
1831 | ||
1832 | return sk->sk_prot->getsockopt(sk, level, optname, optval, optlen); | |
1833 | } | |
1834 | ||
1835 | EXPORT_SYMBOL(sock_common_getsockopt); | |
1836 | ||
3fdadf7d | 1837 | #ifdef CONFIG_COMPAT |
543d9cfe ACM |
1838 | int compat_sock_common_getsockopt(struct socket *sock, int level, int optname, |
1839 | char __user *optval, int __user *optlen) | |
3fdadf7d DM |
1840 | { |
1841 | struct sock *sk = sock->sk; | |
1842 | ||
1e51f951 | 1843 | if (sk->sk_prot->compat_getsockopt != NULL) |
543d9cfe ACM |
1844 | return sk->sk_prot->compat_getsockopt(sk, level, optname, |
1845 | optval, optlen); | |
3fdadf7d DM |
1846 | return sk->sk_prot->getsockopt(sk, level, optname, optval, optlen); |
1847 | } | |
1848 | EXPORT_SYMBOL(compat_sock_common_getsockopt); | |
1849 | #endif | |
1850 | ||
1da177e4 LT |
1851 | int sock_common_recvmsg(struct kiocb *iocb, struct socket *sock, |
1852 | struct msghdr *msg, size_t size, int flags) | |
1853 | { | |
1854 | struct sock *sk = sock->sk; | |
1855 | int addr_len = 0; | |
1856 | int err; | |
1857 | ||
1858 | err = sk->sk_prot->recvmsg(iocb, sk, msg, size, flags & MSG_DONTWAIT, | |
1859 | flags & ~MSG_DONTWAIT, &addr_len); | |
1860 | if (err >= 0) | |
1861 | msg->msg_namelen = addr_len; | |
1862 | return err; | |
1863 | } | |
1864 | ||
1865 | EXPORT_SYMBOL(sock_common_recvmsg); | |
1866 | ||
1867 | /* | |
1868 | * Set socket options on an inet socket. | |
1869 | */ | |
1870 | int sock_common_setsockopt(struct socket *sock, int level, int optname, | |
1871 | char __user *optval, int optlen) | |
1872 | { | |
1873 | struct sock *sk = sock->sk; | |
1874 | ||
1875 | return sk->sk_prot->setsockopt(sk, level, optname, optval, optlen); | |
1876 | } | |
1877 | ||
1878 | EXPORT_SYMBOL(sock_common_setsockopt); | |
1879 | ||
3fdadf7d | 1880 | #ifdef CONFIG_COMPAT |
543d9cfe ACM |
1881 | int compat_sock_common_setsockopt(struct socket *sock, int level, int optname, |
1882 | char __user *optval, int optlen) | |
3fdadf7d DM |
1883 | { |
1884 | struct sock *sk = sock->sk; | |
1885 | ||
543d9cfe ACM |
1886 | if (sk->sk_prot->compat_setsockopt != NULL) |
1887 | return sk->sk_prot->compat_setsockopt(sk, level, optname, | |
1888 | optval, optlen); | |
3fdadf7d DM |
1889 | return sk->sk_prot->setsockopt(sk, level, optname, optval, optlen); |
1890 | } | |
1891 | EXPORT_SYMBOL(compat_sock_common_setsockopt); | |
1892 | #endif | |
1893 | ||
1da177e4 LT |
1894 | void sk_common_release(struct sock *sk) |
1895 | { | |
1896 | if (sk->sk_prot->destroy) | |
1897 | sk->sk_prot->destroy(sk); | |
1898 | ||
1899 | /* | |
1900 | * Observation: when sock_common_release is called, processes have | |
1901 | * no access to socket. But net still has. | |
1902 | * Step one, detach it from networking: | |
1903 | * | |
1904 | * A. Remove from hash tables. | |
1905 | */ | |
1906 | ||
1907 | sk->sk_prot->unhash(sk); | |
1908 | ||
1909 | /* | |
1910 | * In this point socket cannot receive new packets, but it is possible | |
1911 | * that some packets are in flight because some CPU runs receiver and | |
1912 | * did hash table lookup before we unhashed socket. They will achieve | |
1913 | * receive queue and will be purged by socket destructor. | |
1914 | * | |
1915 | * Also we still have packets pending on receive queue and probably, | |
1916 | * our own packets waiting in device queues. sock_destroy will drain | |
1917 | * receive queue, but transmitted packets will delay socket destruction | |
1918 | * until the last reference will be released. | |
1919 | */ | |
1920 | ||
1921 | sock_orphan(sk); | |
1922 | ||
1923 | xfrm_sk_free_policy(sk); | |
1924 | ||
e6848976 | 1925 | sk_refcnt_debug_release(sk); |
1da177e4 LT |
1926 | sock_put(sk); |
1927 | } | |
1928 | ||
1929 | EXPORT_SYMBOL(sk_common_release); | |
1930 | ||
1931 | static DEFINE_RWLOCK(proto_list_lock); | |
1932 | static LIST_HEAD(proto_list); | |
1933 | ||
13ff3d6f PE |
1934 | #ifdef CONFIG_PROC_FS |
1935 | #define PROTO_INUSE_NR 64 /* should be enough for the first time */ | |
1338d466 PE |
1936 | struct prot_inuse { |
1937 | int val[PROTO_INUSE_NR]; | |
1938 | }; | |
13ff3d6f PE |
1939 | |
1940 | static DECLARE_BITMAP(proto_inuse_idx, PROTO_INUSE_NR); | |
70ee1159 PE |
1941 | |
1942 | #ifdef CONFIG_NET_NS | |
1943 | void sock_prot_inuse_add(struct net *net, struct proto *prot, int val) | |
1944 | { | |
1945 | int cpu = smp_processor_id(); | |
1946 | per_cpu_ptr(net->core.inuse, cpu)->val[prot->inuse_idx] += val; | |
1947 | } | |
1948 | EXPORT_SYMBOL_GPL(sock_prot_inuse_add); | |
1949 | ||
1950 | int sock_prot_inuse_get(struct net *net, struct proto *prot) | |
1951 | { | |
1952 | int cpu, idx = prot->inuse_idx; | |
1953 | int res = 0; | |
1954 | ||
1955 | for_each_possible_cpu(cpu) | |
1956 | res += per_cpu_ptr(net->core.inuse, cpu)->val[idx]; | |
1957 | ||
1958 | return res >= 0 ? res : 0; | |
1959 | } | |
1960 | EXPORT_SYMBOL_GPL(sock_prot_inuse_get); | |
1961 | ||
1962 | static int sock_inuse_init_net(struct net *net) | |
1963 | { | |
1964 | net->core.inuse = alloc_percpu(struct prot_inuse); | |
1965 | return net->core.inuse ? 0 : -ENOMEM; | |
1966 | } | |
1967 | ||
1968 | static void sock_inuse_exit_net(struct net *net) | |
1969 | { | |
1970 | free_percpu(net->core.inuse); | |
1971 | } | |
1972 | ||
1973 | static struct pernet_operations net_inuse_ops = { | |
1974 | .init = sock_inuse_init_net, | |
1975 | .exit = sock_inuse_exit_net, | |
1976 | }; | |
1977 | ||
1978 | static __init int net_inuse_init(void) | |
1979 | { | |
1980 | if (register_pernet_subsys(&net_inuse_ops)) | |
1981 | panic("Cannot initialize net inuse counters"); | |
1982 | ||
1983 | return 0; | |
1984 | } | |
1985 | ||
1986 | core_initcall(net_inuse_init); | |
1987 | #else | |
1338d466 PE |
1988 | static DEFINE_PER_CPU(struct prot_inuse, prot_inuse); |
1989 | ||
c29a0bc4 | 1990 | void sock_prot_inuse_add(struct net *net, struct proto *prot, int val) |
1338d466 PE |
1991 | { |
1992 | __get_cpu_var(prot_inuse).val[prot->inuse_idx] += val; | |
1993 | } | |
1994 | EXPORT_SYMBOL_GPL(sock_prot_inuse_add); | |
1995 | ||
c29a0bc4 | 1996 | int sock_prot_inuse_get(struct net *net, struct proto *prot) |
1338d466 PE |
1997 | { |
1998 | int cpu, idx = prot->inuse_idx; | |
1999 | int res = 0; | |
2000 | ||
2001 | for_each_possible_cpu(cpu) | |
2002 | res += per_cpu(prot_inuse, cpu).val[idx]; | |
2003 | ||
2004 | return res >= 0 ? res : 0; | |
2005 | } | |
2006 | EXPORT_SYMBOL_GPL(sock_prot_inuse_get); | |
70ee1159 | 2007 | #endif |
13ff3d6f PE |
2008 | |
2009 | static void assign_proto_idx(struct proto *prot) | |
2010 | { | |
2011 | prot->inuse_idx = find_first_zero_bit(proto_inuse_idx, PROTO_INUSE_NR); | |
2012 | ||
2013 | if (unlikely(prot->inuse_idx == PROTO_INUSE_NR - 1)) { | |
2014 | printk(KERN_ERR "PROTO_INUSE_NR exhausted\n"); | |
2015 | return; | |
2016 | } | |
2017 | ||
2018 | set_bit(prot->inuse_idx, proto_inuse_idx); | |
2019 | } | |
2020 | ||
2021 | static void release_proto_idx(struct proto *prot) | |
2022 | { | |
2023 | if (prot->inuse_idx != PROTO_INUSE_NR - 1) | |
2024 | clear_bit(prot->inuse_idx, proto_inuse_idx); | |
2025 | } | |
2026 | #else | |
2027 | static inline void assign_proto_idx(struct proto *prot) | |
2028 | { | |
2029 | } | |
2030 | ||
2031 | static inline void release_proto_idx(struct proto *prot) | |
2032 | { | |
2033 | } | |
2034 | #endif | |
2035 | ||
b733c007 PE |
2036 | int proto_register(struct proto *prot, int alloc_slab) |
2037 | { | |
1da177e4 LT |
2038 | if (alloc_slab) { |
2039 | prot->slab = kmem_cache_create(prot->name, prot->obj_size, 0, | |
20c2df83 | 2040 | SLAB_HWCACHE_ALIGN, NULL); |
1da177e4 LT |
2041 | |
2042 | if (prot->slab == NULL) { | |
2043 | printk(KERN_CRIT "%s: Can't create sock SLAB cache!\n", | |
2044 | prot->name); | |
60e7663d | 2045 | goto out; |
1da177e4 | 2046 | } |
2e6599cb ACM |
2047 | |
2048 | if (prot->rsk_prot != NULL) { | |
2049 | static const char mask[] = "request_sock_%s"; | |
2050 | ||
7e56b5d6 CM |
2051 | prot->rsk_prot->slab_name = kmalloc(strlen(prot->name) + sizeof(mask) - 1, GFP_KERNEL); |
2052 | if (prot->rsk_prot->slab_name == NULL) | |
2e6599cb ACM |
2053 | goto out_free_sock_slab; |
2054 | ||
7e56b5d6 CM |
2055 | sprintf(prot->rsk_prot->slab_name, mask, prot->name); |
2056 | prot->rsk_prot->slab = kmem_cache_create(prot->rsk_prot->slab_name, | |
2e6599cb | 2057 | prot->rsk_prot->obj_size, 0, |
20c2df83 | 2058 | SLAB_HWCACHE_ALIGN, NULL); |
2e6599cb ACM |
2059 | |
2060 | if (prot->rsk_prot->slab == NULL) { | |
2061 | printk(KERN_CRIT "%s: Can't create request sock SLAB cache!\n", | |
2062 | prot->name); | |
2063 | goto out_free_request_sock_slab_name; | |
2064 | } | |
2065 | } | |
8feaf0c0 | 2066 | |
6d6ee43e | 2067 | if (prot->twsk_prot != NULL) { |
8feaf0c0 ACM |
2068 | static const char mask[] = "tw_sock_%s"; |
2069 | ||
7e56b5d6 | 2070 | prot->twsk_prot->twsk_slab_name = kmalloc(strlen(prot->name) + sizeof(mask) - 1, GFP_KERNEL); |
8feaf0c0 | 2071 | |
7e56b5d6 | 2072 | if (prot->twsk_prot->twsk_slab_name == NULL) |
8feaf0c0 ACM |
2073 | goto out_free_request_sock_slab; |
2074 | ||
7e56b5d6 | 2075 | sprintf(prot->twsk_prot->twsk_slab_name, mask, prot->name); |
6d6ee43e | 2076 | prot->twsk_prot->twsk_slab = |
7e56b5d6 | 2077 | kmem_cache_create(prot->twsk_prot->twsk_slab_name, |
6d6ee43e ACM |
2078 | prot->twsk_prot->twsk_obj_size, |
2079 | 0, SLAB_HWCACHE_ALIGN, | |
20c2df83 | 2080 | NULL); |
6d6ee43e | 2081 | if (prot->twsk_prot->twsk_slab == NULL) |
8feaf0c0 ACM |
2082 | goto out_free_timewait_sock_slab_name; |
2083 | } | |
1da177e4 LT |
2084 | } |
2085 | ||
2a278051 | 2086 | write_lock(&proto_list_lock); |
1da177e4 | 2087 | list_add(&prot->node, &proto_list); |
13ff3d6f | 2088 | assign_proto_idx(prot); |
1da177e4 | 2089 | write_unlock(&proto_list_lock); |
b733c007 PE |
2090 | return 0; |
2091 | ||
8feaf0c0 | 2092 | out_free_timewait_sock_slab_name: |
7e56b5d6 | 2093 | kfree(prot->twsk_prot->twsk_slab_name); |
8feaf0c0 ACM |
2094 | out_free_request_sock_slab: |
2095 | if (prot->rsk_prot && prot->rsk_prot->slab) { | |
2096 | kmem_cache_destroy(prot->rsk_prot->slab); | |
2097 | prot->rsk_prot->slab = NULL; | |
2098 | } | |
2e6599cb | 2099 | out_free_request_sock_slab_name: |
7e56b5d6 | 2100 | kfree(prot->rsk_prot->slab_name); |
2e6599cb ACM |
2101 | out_free_sock_slab: |
2102 | kmem_cache_destroy(prot->slab); | |
2103 | prot->slab = NULL; | |
b733c007 PE |
2104 | out: |
2105 | return -ENOBUFS; | |
1da177e4 LT |
2106 | } |
2107 | ||
2108 | EXPORT_SYMBOL(proto_register); | |
2109 | ||
2110 | void proto_unregister(struct proto *prot) | |
2111 | { | |
2112 | write_lock(&proto_list_lock); | |
13ff3d6f | 2113 | release_proto_idx(prot); |
0a3f4358 PM |
2114 | list_del(&prot->node); |
2115 | write_unlock(&proto_list_lock); | |
1da177e4 LT |
2116 | |
2117 | if (prot->slab != NULL) { | |
2118 | kmem_cache_destroy(prot->slab); | |
2119 | prot->slab = NULL; | |
2120 | } | |
2121 | ||
2e6599cb | 2122 | if (prot->rsk_prot != NULL && prot->rsk_prot->slab != NULL) { |
2e6599cb | 2123 | kmem_cache_destroy(prot->rsk_prot->slab); |
7e56b5d6 | 2124 | kfree(prot->rsk_prot->slab_name); |
2e6599cb ACM |
2125 | prot->rsk_prot->slab = NULL; |
2126 | } | |
2127 | ||
6d6ee43e | 2128 | if (prot->twsk_prot != NULL && prot->twsk_prot->twsk_slab != NULL) { |
6d6ee43e | 2129 | kmem_cache_destroy(prot->twsk_prot->twsk_slab); |
7e56b5d6 | 2130 | kfree(prot->twsk_prot->twsk_slab_name); |
6d6ee43e | 2131 | prot->twsk_prot->twsk_slab = NULL; |
8feaf0c0 | 2132 | } |
1da177e4 LT |
2133 | } |
2134 | ||
2135 | EXPORT_SYMBOL(proto_unregister); | |
2136 | ||
2137 | #ifdef CONFIG_PROC_FS | |
1da177e4 | 2138 | static void *proto_seq_start(struct seq_file *seq, loff_t *pos) |
9a429c49 | 2139 | __acquires(proto_list_lock) |
1da177e4 LT |
2140 | { |
2141 | read_lock(&proto_list_lock); | |
60f0438a | 2142 | return seq_list_start_head(&proto_list, *pos); |
1da177e4 LT |
2143 | } |
2144 | ||
2145 | static void *proto_seq_next(struct seq_file *seq, void *v, loff_t *pos) | |
2146 | { | |
60f0438a | 2147 | return seq_list_next(v, &proto_list, pos); |
1da177e4 LT |
2148 | } |
2149 | ||
2150 | static void proto_seq_stop(struct seq_file *seq, void *v) | |
9a429c49 | 2151 | __releases(proto_list_lock) |
1da177e4 LT |
2152 | { |
2153 | read_unlock(&proto_list_lock); | |
2154 | } | |
2155 | ||
2156 | static char proto_method_implemented(const void *method) | |
2157 | { | |
2158 | return method == NULL ? 'n' : 'y'; | |
2159 | } | |
2160 | ||
2161 | static void proto_seq_printf(struct seq_file *seq, struct proto *proto) | |
2162 | { | |
2163 | seq_printf(seq, "%-9s %4u %6d %6d %-3s %6u %-3s %-10s " | |
2164 | "%2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c\n", | |
2165 | proto->name, | |
2166 | proto->obj_size, | |
2167 | proto->sockets_allocated != NULL ? atomic_read(proto->sockets_allocated) : -1, | |
2168 | proto->memory_allocated != NULL ? atomic_read(proto->memory_allocated) : -1, | |
2169 | proto->memory_pressure != NULL ? *proto->memory_pressure ? "yes" : "no" : "NI", | |
2170 | proto->max_header, | |
2171 | proto->slab == NULL ? "no" : "yes", | |
2172 | module_name(proto->owner), | |
2173 | proto_method_implemented(proto->close), | |
2174 | proto_method_implemented(proto->connect), | |
2175 | proto_method_implemented(proto->disconnect), | |
2176 | proto_method_implemented(proto->accept), | |
2177 | proto_method_implemented(proto->ioctl), | |
2178 | proto_method_implemented(proto->init), | |
2179 | proto_method_implemented(proto->destroy), | |
2180 | proto_method_implemented(proto->shutdown), | |
2181 | proto_method_implemented(proto->setsockopt), | |
2182 | proto_method_implemented(proto->getsockopt), | |
2183 | proto_method_implemented(proto->sendmsg), | |
2184 | proto_method_implemented(proto->recvmsg), | |
2185 | proto_method_implemented(proto->sendpage), | |
2186 | proto_method_implemented(proto->bind), | |
2187 | proto_method_implemented(proto->backlog_rcv), | |
2188 | proto_method_implemented(proto->hash), | |
2189 | proto_method_implemented(proto->unhash), | |
2190 | proto_method_implemented(proto->get_port), | |
2191 | proto_method_implemented(proto->enter_memory_pressure)); | |
2192 | } | |
2193 | ||
2194 | static int proto_seq_show(struct seq_file *seq, void *v) | |
2195 | { | |
60f0438a | 2196 | if (v == &proto_list) |
1da177e4 LT |
2197 | seq_printf(seq, "%-9s %-4s %-8s %-6s %-5s %-7s %-4s %-10s %s", |
2198 | "protocol", | |
2199 | "size", | |
2200 | "sockets", | |
2201 | "memory", | |
2202 | "press", | |
2203 | "maxhdr", | |
2204 | "slab", | |
2205 | "module", | |
2206 | "cl co di ac io in de sh ss gs se re sp bi br ha uh gp em\n"); | |
2207 | else | |
60f0438a | 2208 | proto_seq_printf(seq, list_entry(v, struct proto, node)); |
1da177e4 LT |
2209 | return 0; |
2210 | } | |
2211 | ||
f690808e | 2212 | static const struct seq_operations proto_seq_ops = { |
1da177e4 LT |
2213 | .start = proto_seq_start, |
2214 | .next = proto_seq_next, | |
2215 | .stop = proto_seq_stop, | |
2216 | .show = proto_seq_show, | |
2217 | }; | |
2218 | ||
2219 | static int proto_seq_open(struct inode *inode, struct file *file) | |
2220 | { | |
2221 | return seq_open(file, &proto_seq_ops); | |
2222 | } | |
2223 | ||
9a32144e | 2224 | static const struct file_operations proto_seq_fops = { |
1da177e4 LT |
2225 | .owner = THIS_MODULE, |
2226 | .open = proto_seq_open, | |
2227 | .read = seq_read, | |
2228 | .llseek = seq_lseek, | |
2229 | .release = seq_release, | |
2230 | }; | |
2231 | ||
2232 | static int __init proto_init(void) | |
2233 | { | |
2234 | /* register /proc/net/protocols */ | |
457c4cbc | 2235 | return proc_net_fops_create(&init_net, "protocols", S_IRUGO, &proto_seq_fops) == NULL ? -ENOBUFS : 0; |
1da177e4 LT |
2236 | } |
2237 | ||
2238 | subsys_initcall(proto_init); | |
2239 | ||
2240 | #endif /* PROC_FS */ | |
2241 | ||
2242 | EXPORT_SYMBOL(sk_alloc); | |
2243 | EXPORT_SYMBOL(sk_free); | |
2244 | EXPORT_SYMBOL(sk_send_sigurg); | |
2245 | EXPORT_SYMBOL(sock_alloc_send_skb); | |
2246 | EXPORT_SYMBOL(sock_init_data); | |
2247 | EXPORT_SYMBOL(sock_kfree_s); | |
2248 | EXPORT_SYMBOL(sock_kmalloc); | |
2249 | EXPORT_SYMBOL(sock_no_accept); | |
2250 | EXPORT_SYMBOL(sock_no_bind); | |
2251 | EXPORT_SYMBOL(sock_no_connect); | |
2252 | EXPORT_SYMBOL(sock_no_getname); | |
2253 | EXPORT_SYMBOL(sock_no_getsockopt); | |
2254 | EXPORT_SYMBOL(sock_no_ioctl); | |
2255 | EXPORT_SYMBOL(sock_no_listen); | |
2256 | EXPORT_SYMBOL(sock_no_mmap); | |
2257 | EXPORT_SYMBOL(sock_no_poll); | |
2258 | EXPORT_SYMBOL(sock_no_recvmsg); | |
2259 | EXPORT_SYMBOL(sock_no_sendmsg); | |
2260 | EXPORT_SYMBOL(sock_no_sendpage); | |
2261 | EXPORT_SYMBOL(sock_no_setsockopt); | |
2262 | EXPORT_SYMBOL(sock_no_shutdown); | |
2263 | EXPORT_SYMBOL(sock_no_socketpair); | |
2264 | EXPORT_SYMBOL(sock_rfree); | |
2265 | EXPORT_SYMBOL(sock_setsockopt); | |
2266 | EXPORT_SYMBOL(sock_wfree); | |
2267 | EXPORT_SYMBOL(sock_wmalloc); | |
2268 | EXPORT_SYMBOL(sock_i_uid); | |
2269 | EXPORT_SYMBOL(sock_i_ino); | |
1da177e4 | 2270 | EXPORT_SYMBOL(sysctl_optmem_max); |