Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * INET An implementation of the TCP/IP protocol suite for the LINUX | |
3 | * operating system. INET is implemented using the BSD Socket | |
4 | * interface as the means of communication with the user level. | |
5 | * | |
6 | * Generic socket support routines. Memory allocators, socket lock/release | |
7 | * handler for protocols to use and generic option handler. | |
8 | * | |
9 | * | |
02c30a84 | 10 | * Authors: Ross Biro |
1da177e4 LT |
11 | * Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG> |
12 | * Florian La Roche, <flla@stud.uni-sb.de> | |
13 | * Alan Cox, <A.Cox@swansea.ac.uk> | |
14 | * | |
15 | * Fixes: | |
16 | * Alan Cox : Numerous verify_area() problems | |
17 | * Alan Cox : Connecting on a connecting socket | |
18 | * now returns an error for tcp. | |
19 | * Alan Cox : sock->protocol is set correctly. | |
20 | * and is not sometimes left as 0. | |
21 | * Alan Cox : connect handles icmp errors on a | |
22 | * connect properly. Unfortunately there | |
23 | * is a restart syscall nasty there. I | |
24 | * can't match BSD without hacking the C | |
25 | * library. Ideas urgently sought! | |
26 | * Alan Cox : Disallow bind() to addresses that are | |
27 | * not ours - especially broadcast ones!! | |
28 | * Alan Cox : Socket 1024 _IS_ ok for users. (fencepost) | |
29 | * Alan Cox : sock_wfree/sock_rfree don't destroy sockets, | |
30 | * instead they leave that for the DESTROY timer. | |
31 | * Alan Cox : Clean up error flag in accept | |
32 | * Alan Cox : TCP ack handling is buggy, the DESTROY timer | |
33 | * was buggy. Put a remove_sock() in the handler | |
34 | * for memory when we hit 0. Also altered the timer | |
4ec93edb | 35 | * code. The ACK stuff can wait and needs major |
1da177e4 LT |
36 | * TCP layer surgery. |
37 | * Alan Cox : Fixed TCP ack bug, removed remove sock | |
38 | * and fixed timer/inet_bh race. | |
39 | * Alan Cox : Added zapped flag for TCP | |
40 | * Alan Cox : Move kfree_skb into skbuff.c and tidied up surplus code | |
41 | * Alan Cox : for new sk_buff allocations wmalloc/rmalloc now call alloc_skb | |
42 | * Alan Cox : kfree_s calls now are kfree_skbmem so we can track skb resources | |
43 | * Alan Cox : Supports socket option broadcast now as does udp. Packet and raw need fixing. | |
44 | * Alan Cox : Added RCVBUF,SNDBUF size setting. It suddenly occurred to me how easy it was so... | |
45 | * Rick Sladkey : Relaxed UDP rules for matching packets. | |
46 | * C.E.Hawkins : IFF_PROMISC/SIOCGHWADDR support | |
47 | * Pauline Middelink : identd support | |
48 | * Alan Cox : Fixed connect() taking signals I think. | |
49 | * Alan Cox : SO_LINGER supported | |
50 | * Alan Cox : Error reporting fixes | |
51 | * Anonymous : inet_create tidied up (sk->reuse setting) | |
52 | * Alan Cox : inet sockets don't set sk->type! | |
53 | * Alan Cox : Split socket option code | |
54 | * Alan Cox : Callbacks | |
55 | * Alan Cox : Nagle flag for Charles & Johannes stuff | |
56 | * Alex : Removed restriction on inet fioctl | |
57 | * Alan Cox : Splitting INET from NET core | |
58 | * Alan Cox : Fixed bogus SO_TYPE handling in getsockopt() | |
59 | * Adam Caldwell : Missing return in SO_DONTROUTE/SO_DEBUG code | |
60 | * Alan Cox : Split IP from generic code | |
61 | * Alan Cox : New kfree_skbmem() | |
62 | * Alan Cox : Make SO_DEBUG superuser only. | |
63 | * Alan Cox : Allow anyone to clear SO_DEBUG | |
64 | * (compatibility fix) | |
65 | * Alan Cox : Added optimistic memory grabbing for AF_UNIX throughput. | |
66 | * Alan Cox : Allocator for a socket is settable. | |
67 | * Alan Cox : SO_ERROR includes soft errors. | |
68 | * Alan Cox : Allow NULL arguments on some SO_ opts | |
69 | * Alan Cox : Generic socket allocation to make hooks | |
70 | * easier (suggested by Craig Metz). | |
71 | * Michael Pall : SO_ERROR returns positive errno again | |
72 | * Steve Whitehouse: Added default destructor to free | |
73 | * protocol private data. | |
74 | * Steve Whitehouse: Added various other default routines | |
75 | * common to several socket families. | |
76 | * Chris Evans : Call suser() check last on F_SETOWN | |
77 | * Jay Schulist : Added SO_ATTACH_FILTER and SO_DETACH_FILTER. | |
78 | * Andi Kleen : Add sock_kmalloc()/sock_kfree_s() | |
79 | * Andi Kleen : Fix write_space callback | |
80 | * Chris Evans : Security fixes - signedness again | |
81 | * Arnaldo C. Melo : cleanups, use skb_queue_purge | |
82 | * | |
83 | * To Fix: | |
84 | * | |
85 | * | |
86 | * This program is free software; you can redistribute it and/or | |
87 | * modify it under the terms of the GNU General Public License | |
88 | * as published by the Free Software Foundation; either version | |
89 | * 2 of the License, or (at your option) any later version. | |
90 | */ | |
91 | ||
4fc268d2 | 92 | #include <linux/capability.h> |
1da177e4 LT |
93 | #include <linux/errno.h> |
94 | #include <linux/types.h> | |
95 | #include <linux/socket.h> | |
96 | #include <linux/in.h> | |
97 | #include <linux/kernel.h> | |
1da177e4 LT |
98 | #include <linux/module.h> |
99 | #include <linux/proc_fs.h> | |
100 | #include <linux/seq_file.h> | |
101 | #include <linux/sched.h> | |
102 | #include <linux/timer.h> | |
103 | #include <linux/string.h> | |
104 | #include <linux/sockios.h> | |
105 | #include <linux/net.h> | |
106 | #include <linux/mm.h> | |
107 | #include <linux/slab.h> | |
108 | #include <linux/interrupt.h> | |
109 | #include <linux/poll.h> | |
110 | #include <linux/tcp.h> | |
111 | #include <linux/init.h> | |
a1f8e7f7 | 112 | #include <linux/highmem.h> |
3f551f94 | 113 | #include <linux/user_namespace.h> |
1da177e4 LT |
114 | |
115 | #include <asm/uaccess.h> | |
116 | #include <asm/system.h> | |
117 | ||
118 | #include <linux/netdevice.h> | |
119 | #include <net/protocol.h> | |
120 | #include <linux/skbuff.h> | |
457c4cbc | 121 | #include <net/net_namespace.h> |
2e6599cb | 122 | #include <net/request_sock.h> |
1da177e4 | 123 | #include <net/sock.h> |
20d49473 | 124 | #include <linux/net_tstamp.h> |
1da177e4 LT |
125 | #include <net/xfrm.h> |
126 | #include <linux/ipsec.h> | |
f8451725 | 127 | #include <net/cls_cgroup.h> |
1da177e4 LT |
128 | |
129 | #include <linux/filter.h> | |
130 | ||
3847ce32 SM |
131 | #include <trace/events/sock.h> |
132 | ||
1da177e4 LT |
133 | #ifdef CONFIG_INET |
134 | #include <net/tcp.h> | |
135 | #endif | |
136 | ||
da21f24d IM |
137 | /* |
138 | * Each address family might have different locking rules, so we have | |
139 | * one slock key per address family: | |
140 | */ | |
a5b5bb9a IM |
141 | static struct lock_class_key af_family_keys[AF_MAX]; |
142 | static struct lock_class_key af_family_slock_keys[AF_MAX]; | |
143 | ||
a5b5bb9a IM |
144 | /* |
145 | * Make lock validator output more readable. (we pre-construct these | |
146 | * strings build-time, so that runtime initialization of socket | |
147 | * locks is fast): | |
148 | */ | |
36cbd3dc | 149 | static const char *const af_family_key_strings[AF_MAX+1] = { |
a5b5bb9a IM |
150 | "sk_lock-AF_UNSPEC", "sk_lock-AF_UNIX" , "sk_lock-AF_INET" , |
151 | "sk_lock-AF_AX25" , "sk_lock-AF_IPX" , "sk_lock-AF_APPLETALK", | |
152 | "sk_lock-AF_NETROM", "sk_lock-AF_BRIDGE" , "sk_lock-AF_ATMPVC" , | |
153 | "sk_lock-AF_X25" , "sk_lock-AF_INET6" , "sk_lock-AF_ROSE" , | |
154 | "sk_lock-AF_DECnet", "sk_lock-AF_NETBEUI" , "sk_lock-AF_SECURITY" , | |
155 | "sk_lock-AF_KEY" , "sk_lock-AF_NETLINK" , "sk_lock-AF_PACKET" , | |
156 | "sk_lock-AF_ASH" , "sk_lock-AF_ECONET" , "sk_lock-AF_ATMSVC" , | |
cbd151bf | 157 | "sk_lock-AF_RDS" , "sk_lock-AF_SNA" , "sk_lock-AF_IRDA" , |
a5b5bb9a | 158 | "sk_lock-AF_PPPOX" , "sk_lock-AF_WANPIPE" , "sk_lock-AF_LLC" , |
cd05acfe | 159 | "sk_lock-27" , "sk_lock-28" , "sk_lock-AF_CAN" , |
17926a79 | 160 | "sk_lock-AF_TIPC" , "sk_lock-AF_BLUETOOTH", "sk_lock-IUCV" , |
bce7b154 | 161 | "sk_lock-AF_RXRPC" , "sk_lock-AF_ISDN" , "sk_lock-AF_PHONET" , |
6f107b58 | 162 | "sk_lock-AF_IEEE802154", "sk_lock-AF_CAIF" , "sk_lock-AF_ALG" , |
c7fe3b52 | 163 | "sk_lock-AF_NFC" , "sk_lock-AF_MAX" |
a5b5bb9a | 164 | }; |
36cbd3dc | 165 | static const char *const af_family_slock_key_strings[AF_MAX+1] = { |
a5b5bb9a IM |
166 | "slock-AF_UNSPEC", "slock-AF_UNIX" , "slock-AF_INET" , |
167 | "slock-AF_AX25" , "slock-AF_IPX" , "slock-AF_APPLETALK", | |
168 | "slock-AF_NETROM", "slock-AF_BRIDGE" , "slock-AF_ATMPVC" , | |
169 | "slock-AF_X25" , "slock-AF_INET6" , "slock-AF_ROSE" , | |
170 | "slock-AF_DECnet", "slock-AF_NETBEUI" , "slock-AF_SECURITY" , | |
171 | "slock-AF_KEY" , "slock-AF_NETLINK" , "slock-AF_PACKET" , | |
172 | "slock-AF_ASH" , "slock-AF_ECONET" , "slock-AF_ATMSVC" , | |
cbd151bf | 173 | "slock-AF_RDS" , "slock-AF_SNA" , "slock-AF_IRDA" , |
a5b5bb9a | 174 | "slock-AF_PPPOX" , "slock-AF_WANPIPE" , "slock-AF_LLC" , |
cd05acfe | 175 | "slock-27" , "slock-28" , "slock-AF_CAN" , |
17926a79 | 176 | "slock-AF_TIPC" , "slock-AF_BLUETOOTH", "slock-AF_IUCV" , |
bce7b154 | 177 | "slock-AF_RXRPC" , "slock-AF_ISDN" , "slock-AF_PHONET" , |
6f107b58 | 178 | "slock-AF_IEEE802154", "slock-AF_CAIF" , "slock-AF_ALG" , |
c7fe3b52 | 179 | "slock-AF_NFC" , "slock-AF_MAX" |
a5b5bb9a | 180 | }; |
36cbd3dc | 181 | static const char *const af_family_clock_key_strings[AF_MAX+1] = { |
443aef0e PZ |
182 | "clock-AF_UNSPEC", "clock-AF_UNIX" , "clock-AF_INET" , |
183 | "clock-AF_AX25" , "clock-AF_IPX" , "clock-AF_APPLETALK", | |
184 | "clock-AF_NETROM", "clock-AF_BRIDGE" , "clock-AF_ATMPVC" , | |
185 | "clock-AF_X25" , "clock-AF_INET6" , "clock-AF_ROSE" , | |
186 | "clock-AF_DECnet", "clock-AF_NETBEUI" , "clock-AF_SECURITY" , | |
187 | "clock-AF_KEY" , "clock-AF_NETLINK" , "clock-AF_PACKET" , | |
188 | "clock-AF_ASH" , "clock-AF_ECONET" , "clock-AF_ATMSVC" , | |
cbd151bf | 189 | "clock-AF_RDS" , "clock-AF_SNA" , "clock-AF_IRDA" , |
443aef0e | 190 | "clock-AF_PPPOX" , "clock-AF_WANPIPE" , "clock-AF_LLC" , |
b4942af6 | 191 | "clock-27" , "clock-28" , "clock-AF_CAN" , |
e51f802b | 192 | "clock-AF_TIPC" , "clock-AF_BLUETOOTH", "clock-AF_IUCV" , |
bce7b154 | 193 | "clock-AF_RXRPC" , "clock-AF_ISDN" , "clock-AF_PHONET" , |
6f107b58 | 194 | "clock-AF_IEEE802154", "clock-AF_CAIF" , "clock-AF_ALG" , |
c7fe3b52 | 195 | "clock-AF_NFC" , "clock-AF_MAX" |
443aef0e | 196 | }; |
da21f24d IM |
197 | |
198 | /* | |
199 | * sk_callback_lock locking rules are per-address-family, | |
200 | * so split the lock classes by using a per-AF key: | |
201 | */ | |
202 | static struct lock_class_key af_callback_keys[AF_MAX]; | |
203 | ||
1da177e4 LT |
204 | /* Take into consideration the size of the struct sk_buff overhead in the |
205 | * determination of these values, since that is non-constant across | |
206 | * platforms. This makes socket queueing behavior and performance | |
207 | * not depend upon such differences. | |
208 | */ | |
209 | #define _SK_MEM_PACKETS 256 | |
87fb4b7b | 210 | #define _SK_MEM_OVERHEAD SKB_TRUESIZE(256) |
1da177e4 LT |
211 | #define SK_WMEM_MAX (_SK_MEM_OVERHEAD * _SK_MEM_PACKETS) |
212 | #define SK_RMEM_MAX (_SK_MEM_OVERHEAD * _SK_MEM_PACKETS) | |
213 | ||
214 | /* Run time adjustable parameters. */ | |
ab32ea5d BH |
215 | __u32 sysctl_wmem_max __read_mostly = SK_WMEM_MAX; |
216 | __u32 sysctl_rmem_max __read_mostly = SK_RMEM_MAX; | |
217 | __u32 sysctl_wmem_default __read_mostly = SK_WMEM_MAX; | |
218 | __u32 sysctl_rmem_default __read_mostly = SK_RMEM_MAX; | |
1da177e4 | 219 | |
25985edc | 220 | /* Maximal space eaten by iovec or ancillary data plus some space */ |
ab32ea5d | 221 | int sysctl_optmem_max __read_mostly = sizeof(unsigned long)*(2*UIO_MAXIOV+512); |
2a91525c | 222 | EXPORT_SYMBOL(sysctl_optmem_max); |
1da177e4 | 223 | |
f8451725 HX |
224 | #if defined(CONFIG_CGROUPS) && !defined(CONFIG_NET_CLS_CGROUP) |
225 | int net_cls_subsys_id = -1; | |
226 | EXPORT_SYMBOL_GPL(net_cls_subsys_id); | |
227 | #endif | |
228 | ||
1da177e4 LT |
229 | static int sock_set_timeout(long *timeo_p, char __user *optval, int optlen) |
230 | { | |
231 | struct timeval tv; | |
232 | ||
233 | if (optlen < sizeof(tv)) | |
234 | return -EINVAL; | |
235 | if (copy_from_user(&tv, optval, sizeof(tv))) | |
236 | return -EFAULT; | |
ba78073e VA |
237 | if (tv.tv_usec < 0 || tv.tv_usec >= USEC_PER_SEC) |
238 | return -EDOM; | |
1da177e4 | 239 | |
ba78073e | 240 | if (tv.tv_sec < 0) { |
6f11df83 AM |
241 | static int warned __read_mostly; |
242 | ||
ba78073e | 243 | *timeo_p = 0; |
50aab54f | 244 | if (warned < 10 && net_ratelimit()) { |
ba78073e VA |
245 | warned++; |
246 | printk(KERN_INFO "sock_set_timeout: `%s' (pid %d) " | |
247 | "tries to set negative timeout\n", | |
ba25f9dc | 248 | current->comm, task_pid_nr(current)); |
50aab54f | 249 | } |
ba78073e VA |
250 | return 0; |
251 | } | |
1da177e4 LT |
252 | *timeo_p = MAX_SCHEDULE_TIMEOUT; |
253 | if (tv.tv_sec == 0 && tv.tv_usec == 0) | |
254 | return 0; | |
255 | if (tv.tv_sec < (MAX_SCHEDULE_TIMEOUT/HZ - 1)) | |
256 | *timeo_p = tv.tv_sec*HZ + (tv.tv_usec+(1000000/HZ-1))/(1000000/HZ); | |
257 | return 0; | |
258 | } | |
259 | ||
260 | static void sock_warn_obsolete_bsdism(const char *name) | |
261 | { | |
262 | static int warned; | |
263 | static char warncomm[TASK_COMM_LEN]; | |
4ec93edb YH |
264 | if (strcmp(warncomm, current->comm) && warned < 5) { |
265 | strcpy(warncomm, current->comm); | |
1da177e4 LT |
266 | printk(KERN_WARNING "process `%s' is using obsolete " |
267 | "%s SO_BSDCOMPAT\n", warncomm, name); | |
268 | warned++; | |
269 | } | |
270 | } | |
271 | ||
20d49473 | 272 | static void sock_disable_timestamp(struct sock *sk, int flag) |
4ec93edb | 273 | { |
20d49473 PO |
274 | if (sock_flag(sk, flag)) { |
275 | sock_reset_flag(sk, flag); | |
276 | if (!sock_flag(sk, SOCK_TIMESTAMP) && | |
277 | !sock_flag(sk, SOCK_TIMESTAMPING_RX_SOFTWARE)) { | |
278 | net_disable_timestamp(); | |
279 | } | |
1da177e4 LT |
280 | } |
281 | } | |
282 | ||
283 | ||
f0088a50 DV |
284 | int sock_queue_rcv_skb(struct sock *sk, struct sk_buff *skb) |
285 | { | |
766e9037 | 286 | int err; |
f0088a50 | 287 | int skb_len; |
3b885787 NH |
288 | unsigned long flags; |
289 | struct sk_buff_head *list = &sk->sk_receive_queue; | |
f0088a50 | 290 | |
9ee6b7f1 | 291 | /* Cast sk->rcvbuf to unsigned... It's pointless, but reduces |
f0088a50 DV |
292 | number of warnings when compiling with -W --ANK |
293 | */ | |
294 | if (atomic_read(&sk->sk_rmem_alloc) + skb->truesize >= | |
295 | (unsigned)sk->sk_rcvbuf) { | |
766e9037 | 296 | atomic_inc(&sk->sk_drops); |
3847ce32 | 297 | trace_sock_rcvqueue_full(sk, skb); |
766e9037 | 298 | return -ENOMEM; |
f0088a50 DV |
299 | } |
300 | ||
fda9ef5d | 301 | err = sk_filter(sk, skb); |
f0088a50 | 302 | if (err) |
766e9037 | 303 | return err; |
f0088a50 | 304 | |
3ab224be | 305 | if (!sk_rmem_schedule(sk, skb->truesize)) { |
766e9037 ED |
306 | atomic_inc(&sk->sk_drops); |
307 | return -ENOBUFS; | |
3ab224be HA |
308 | } |
309 | ||
f0088a50 DV |
310 | skb->dev = NULL; |
311 | skb_set_owner_r(skb, sk); | |
49ad9599 | 312 | |
f0088a50 DV |
313 | /* Cache the SKB length before we tack it onto the receive |
314 | * queue. Once it is added it no longer belongs to us and | |
315 | * may be freed by other threads of control pulling packets | |
316 | * from the queue. | |
317 | */ | |
318 | skb_len = skb->len; | |
319 | ||
7fee226a ED |
320 | /* we escape from rcu protected region, make sure we dont leak |
321 | * a norefcounted dst | |
322 | */ | |
323 | skb_dst_force(skb); | |
324 | ||
3b885787 NH |
325 | spin_lock_irqsave(&list->lock, flags); |
326 | skb->dropcount = atomic_read(&sk->sk_drops); | |
327 | __skb_queue_tail(list, skb); | |
328 | spin_unlock_irqrestore(&list->lock, flags); | |
f0088a50 DV |
329 | |
330 | if (!sock_flag(sk, SOCK_DEAD)) | |
331 | sk->sk_data_ready(sk, skb_len); | |
766e9037 | 332 | return 0; |
f0088a50 DV |
333 | } |
334 | EXPORT_SYMBOL(sock_queue_rcv_skb); | |
335 | ||
58a5a7b9 | 336 | int sk_receive_skb(struct sock *sk, struct sk_buff *skb, const int nested) |
f0088a50 DV |
337 | { |
338 | int rc = NET_RX_SUCCESS; | |
339 | ||
fda9ef5d | 340 | if (sk_filter(sk, skb)) |
f0088a50 DV |
341 | goto discard_and_relse; |
342 | ||
343 | skb->dev = NULL; | |
344 | ||
c377411f ED |
345 | if (sk_rcvqueues_full(sk, skb)) { |
346 | atomic_inc(&sk->sk_drops); | |
347 | goto discard_and_relse; | |
348 | } | |
58a5a7b9 ACM |
349 | if (nested) |
350 | bh_lock_sock_nested(sk); | |
351 | else | |
352 | bh_lock_sock(sk); | |
a5b5bb9a IM |
353 | if (!sock_owned_by_user(sk)) { |
354 | /* | |
355 | * trylock + unlock semantics: | |
356 | */ | |
357 | mutex_acquire(&sk->sk_lock.dep_map, 0, 1, _RET_IP_); | |
358 | ||
c57943a1 | 359 | rc = sk_backlog_rcv(sk, skb); |
a5b5bb9a IM |
360 | |
361 | mutex_release(&sk->sk_lock.dep_map, 1, _RET_IP_); | |
a3a858ff | 362 | } else if (sk_add_backlog(sk, skb)) { |
8eae939f ZY |
363 | bh_unlock_sock(sk); |
364 | atomic_inc(&sk->sk_drops); | |
365 | goto discard_and_relse; | |
366 | } | |
367 | ||
f0088a50 DV |
368 | bh_unlock_sock(sk); |
369 | out: | |
370 | sock_put(sk); | |
371 | return rc; | |
372 | discard_and_relse: | |
373 | kfree_skb(skb); | |
374 | goto out; | |
375 | } | |
376 | EXPORT_SYMBOL(sk_receive_skb); | |
377 | ||
ea94ff3b KK |
378 | void sk_reset_txq(struct sock *sk) |
379 | { | |
380 | sk_tx_queue_clear(sk); | |
381 | } | |
382 | EXPORT_SYMBOL(sk_reset_txq); | |
383 | ||
f0088a50 DV |
384 | struct dst_entry *__sk_dst_check(struct sock *sk, u32 cookie) |
385 | { | |
b6c6712a | 386 | struct dst_entry *dst = __sk_dst_get(sk); |
f0088a50 DV |
387 | |
388 | if (dst && dst->obsolete && dst->ops->check(dst, cookie) == NULL) { | |
e022f0b4 | 389 | sk_tx_queue_clear(sk); |
a9b3cd7f | 390 | RCU_INIT_POINTER(sk->sk_dst_cache, NULL); |
f0088a50 DV |
391 | dst_release(dst); |
392 | return NULL; | |
393 | } | |
394 | ||
395 | return dst; | |
396 | } | |
397 | EXPORT_SYMBOL(__sk_dst_check); | |
398 | ||
399 | struct dst_entry *sk_dst_check(struct sock *sk, u32 cookie) | |
400 | { | |
401 | struct dst_entry *dst = sk_dst_get(sk); | |
402 | ||
403 | if (dst && dst->obsolete && dst->ops->check(dst, cookie) == NULL) { | |
404 | sk_dst_reset(sk); | |
405 | dst_release(dst); | |
406 | return NULL; | |
407 | } | |
408 | ||
409 | return dst; | |
410 | } | |
411 | EXPORT_SYMBOL(sk_dst_check); | |
412 | ||
4878809f DM |
413 | static int sock_bindtodevice(struct sock *sk, char __user *optval, int optlen) |
414 | { | |
415 | int ret = -ENOPROTOOPT; | |
416 | #ifdef CONFIG_NETDEVICES | |
3b1e0a65 | 417 | struct net *net = sock_net(sk); |
4878809f DM |
418 | char devname[IFNAMSIZ]; |
419 | int index; | |
420 | ||
421 | /* Sorry... */ | |
422 | ret = -EPERM; | |
423 | if (!capable(CAP_NET_RAW)) | |
424 | goto out; | |
425 | ||
426 | ret = -EINVAL; | |
427 | if (optlen < 0) | |
428 | goto out; | |
429 | ||
430 | /* Bind this socket to a particular device like "eth0", | |
431 | * as specified in the passed interface name. If the | |
432 | * name is "" or the option length is zero the socket | |
433 | * is not bound. | |
434 | */ | |
435 | if (optlen > IFNAMSIZ - 1) | |
436 | optlen = IFNAMSIZ - 1; | |
437 | memset(devname, 0, sizeof(devname)); | |
438 | ||
439 | ret = -EFAULT; | |
440 | if (copy_from_user(devname, optval, optlen)) | |
441 | goto out; | |
442 | ||
000ba2e4 DM |
443 | index = 0; |
444 | if (devname[0] != '\0') { | |
bf8e56bf | 445 | struct net_device *dev; |
4878809f | 446 | |
bf8e56bf ED |
447 | rcu_read_lock(); |
448 | dev = dev_get_by_name_rcu(net, devname); | |
449 | if (dev) | |
450 | index = dev->ifindex; | |
451 | rcu_read_unlock(); | |
4878809f DM |
452 | ret = -ENODEV; |
453 | if (!dev) | |
454 | goto out; | |
4878809f DM |
455 | } |
456 | ||
457 | lock_sock(sk); | |
458 | sk->sk_bound_dev_if = index; | |
459 | sk_dst_reset(sk); | |
460 | release_sock(sk); | |
461 | ||
462 | ret = 0; | |
463 | ||
464 | out: | |
465 | #endif | |
466 | ||
467 | return ret; | |
468 | } | |
469 | ||
c0ef877b PE |
470 | static inline void sock_valbool_flag(struct sock *sk, int bit, int valbool) |
471 | { | |
472 | if (valbool) | |
473 | sock_set_flag(sk, bit); | |
474 | else | |
475 | sock_reset_flag(sk, bit); | |
476 | } | |
477 | ||
1da177e4 LT |
478 | /* |
479 | * This is meant for all protocols to use and covers goings on | |
480 | * at the socket level. Everything here is generic. | |
481 | */ | |
482 | ||
483 | int sock_setsockopt(struct socket *sock, int level, int optname, | |
b7058842 | 484 | char __user *optval, unsigned int optlen) |
1da177e4 | 485 | { |
2a91525c | 486 | struct sock *sk = sock->sk; |
1da177e4 LT |
487 | int val; |
488 | int valbool; | |
489 | struct linger ling; | |
490 | int ret = 0; | |
4ec93edb | 491 | |
1da177e4 LT |
492 | /* |
493 | * Options without arguments | |
494 | */ | |
495 | ||
4878809f DM |
496 | if (optname == SO_BINDTODEVICE) |
497 | return sock_bindtodevice(sk, optval, optlen); | |
498 | ||
e71a4783 SH |
499 | if (optlen < sizeof(int)) |
500 | return -EINVAL; | |
4ec93edb | 501 | |
1da177e4 LT |
502 | if (get_user(val, (int __user *)optval)) |
503 | return -EFAULT; | |
4ec93edb | 504 | |
2a91525c | 505 | valbool = val ? 1 : 0; |
1da177e4 LT |
506 | |
507 | lock_sock(sk); | |
508 | ||
2a91525c | 509 | switch (optname) { |
e71a4783 | 510 | case SO_DEBUG: |
2a91525c | 511 | if (val && !capable(CAP_NET_ADMIN)) |
e71a4783 | 512 | ret = -EACCES; |
2a91525c | 513 | else |
c0ef877b | 514 | sock_valbool_flag(sk, SOCK_DBG, valbool); |
e71a4783 SH |
515 | break; |
516 | case SO_REUSEADDR: | |
517 | sk->sk_reuse = valbool; | |
518 | break; | |
519 | case SO_TYPE: | |
49c794e9 | 520 | case SO_PROTOCOL: |
0d6038ee | 521 | case SO_DOMAIN: |
e71a4783 SH |
522 | case SO_ERROR: |
523 | ret = -ENOPROTOOPT; | |
524 | break; | |
525 | case SO_DONTROUTE: | |
c0ef877b | 526 | sock_valbool_flag(sk, SOCK_LOCALROUTE, valbool); |
e71a4783 SH |
527 | break; |
528 | case SO_BROADCAST: | |
529 | sock_valbool_flag(sk, SOCK_BROADCAST, valbool); | |
530 | break; | |
531 | case SO_SNDBUF: | |
532 | /* Don't error on this BSD doesn't and if you think | |
533 | about it this is right. Otherwise apps have to | |
534 | play 'guess the biggest size' games. RCVBUF/SNDBUF | |
535 | are treated in BSD as hints */ | |
536 | ||
537 | if (val > sysctl_wmem_max) | |
538 | val = sysctl_wmem_max; | |
b0573dea | 539 | set_sndbuf: |
e71a4783 SH |
540 | sk->sk_userlocks |= SOCK_SNDBUF_LOCK; |
541 | if ((val * 2) < SOCK_MIN_SNDBUF) | |
542 | sk->sk_sndbuf = SOCK_MIN_SNDBUF; | |
543 | else | |
544 | sk->sk_sndbuf = val * 2; | |
1da177e4 | 545 | |
e71a4783 SH |
546 | /* |
547 | * Wake up sending tasks if we | |
548 | * upped the value. | |
549 | */ | |
550 | sk->sk_write_space(sk); | |
551 | break; | |
1da177e4 | 552 | |
e71a4783 SH |
553 | case SO_SNDBUFFORCE: |
554 | if (!capable(CAP_NET_ADMIN)) { | |
555 | ret = -EPERM; | |
556 | break; | |
557 | } | |
558 | goto set_sndbuf; | |
b0573dea | 559 | |
e71a4783 SH |
560 | case SO_RCVBUF: |
561 | /* Don't error on this BSD doesn't and if you think | |
562 | about it this is right. Otherwise apps have to | |
563 | play 'guess the biggest size' games. RCVBUF/SNDBUF | |
564 | are treated in BSD as hints */ | |
4ec93edb | 565 | |
e71a4783 SH |
566 | if (val > sysctl_rmem_max) |
567 | val = sysctl_rmem_max; | |
b0573dea | 568 | set_rcvbuf: |
e71a4783 SH |
569 | sk->sk_userlocks |= SOCK_RCVBUF_LOCK; |
570 | /* | |
571 | * We double it on the way in to account for | |
572 | * "struct sk_buff" etc. overhead. Applications | |
573 | * assume that the SO_RCVBUF setting they make will | |
574 | * allow that much actual data to be received on that | |
575 | * socket. | |
576 | * | |
577 | * Applications are unaware that "struct sk_buff" and | |
578 | * other overheads allocate from the receive buffer | |
579 | * during socket buffer allocation. | |
580 | * | |
581 | * And after considering the possible alternatives, | |
582 | * returning the value we actually used in getsockopt | |
583 | * is the most desirable behavior. | |
584 | */ | |
585 | if ((val * 2) < SOCK_MIN_RCVBUF) | |
586 | sk->sk_rcvbuf = SOCK_MIN_RCVBUF; | |
587 | else | |
588 | sk->sk_rcvbuf = val * 2; | |
589 | break; | |
590 | ||
591 | case SO_RCVBUFFORCE: | |
592 | if (!capable(CAP_NET_ADMIN)) { | |
593 | ret = -EPERM; | |
1da177e4 | 594 | break; |
e71a4783 SH |
595 | } |
596 | goto set_rcvbuf; | |
1da177e4 | 597 | |
e71a4783 | 598 | case SO_KEEPALIVE: |
1da177e4 | 599 | #ifdef CONFIG_INET |
e71a4783 SH |
600 | if (sk->sk_protocol == IPPROTO_TCP) |
601 | tcp_set_keepalive(sk, valbool); | |
1da177e4 | 602 | #endif |
e71a4783 SH |
603 | sock_valbool_flag(sk, SOCK_KEEPOPEN, valbool); |
604 | break; | |
605 | ||
606 | case SO_OOBINLINE: | |
607 | sock_valbool_flag(sk, SOCK_URGINLINE, valbool); | |
608 | break; | |
609 | ||
610 | case SO_NO_CHECK: | |
611 | sk->sk_no_check = valbool; | |
612 | break; | |
613 | ||
614 | case SO_PRIORITY: | |
615 | if ((val >= 0 && val <= 6) || capable(CAP_NET_ADMIN)) | |
616 | sk->sk_priority = val; | |
617 | else | |
618 | ret = -EPERM; | |
619 | break; | |
620 | ||
621 | case SO_LINGER: | |
622 | if (optlen < sizeof(ling)) { | |
623 | ret = -EINVAL; /* 1003.1g */ | |
1da177e4 | 624 | break; |
e71a4783 | 625 | } |
2a91525c | 626 | if (copy_from_user(&ling, optval, sizeof(ling))) { |
e71a4783 | 627 | ret = -EFAULT; |
1da177e4 | 628 | break; |
e71a4783 SH |
629 | } |
630 | if (!ling.l_onoff) | |
631 | sock_reset_flag(sk, SOCK_LINGER); | |
632 | else { | |
1da177e4 | 633 | #if (BITS_PER_LONG == 32) |
e71a4783 SH |
634 | if ((unsigned int)ling.l_linger >= MAX_SCHEDULE_TIMEOUT/HZ) |
635 | sk->sk_lingertime = MAX_SCHEDULE_TIMEOUT; | |
1da177e4 | 636 | else |
e71a4783 SH |
637 | #endif |
638 | sk->sk_lingertime = (unsigned int)ling.l_linger * HZ; | |
639 | sock_set_flag(sk, SOCK_LINGER); | |
640 | } | |
641 | break; | |
642 | ||
643 | case SO_BSDCOMPAT: | |
644 | sock_warn_obsolete_bsdism("setsockopt"); | |
645 | break; | |
646 | ||
647 | case SO_PASSCRED: | |
648 | if (valbool) | |
649 | set_bit(SOCK_PASSCRED, &sock->flags); | |
650 | else | |
651 | clear_bit(SOCK_PASSCRED, &sock->flags); | |
652 | break; | |
653 | ||
654 | case SO_TIMESTAMP: | |
92f37fd2 | 655 | case SO_TIMESTAMPNS: |
e71a4783 | 656 | if (valbool) { |
92f37fd2 ED |
657 | if (optname == SO_TIMESTAMP) |
658 | sock_reset_flag(sk, SOCK_RCVTSTAMPNS); | |
659 | else | |
660 | sock_set_flag(sk, SOCK_RCVTSTAMPNS); | |
e71a4783 | 661 | sock_set_flag(sk, SOCK_RCVTSTAMP); |
20d49473 | 662 | sock_enable_timestamp(sk, SOCK_TIMESTAMP); |
92f37fd2 | 663 | } else { |
e71a4783 | 664 | sock_reset_flag(sk, SOCK_RCVTSTAMP); |
92f37fd2 ED |
665 | sock_reset_flag(sk, SOCK_RCVTSTAMPNS); |
666 | } | |
e71a4783 SH |
667 | break; |
668 | ||
20d49473 PO |
669 | case SO_TIMESTAMPING: |
670 | if (val & ~SOF_TIMESTAMPING_MASK) { | |
f249fb78 | 671 | ret = -EINVAL; |
20d49473 PO |
672 | break; |
673 | } | |
674 | sock_valbool_flag(sk, SOCK_TIMESTAMPING_TX_HARDWARE, | |
675 | val & SOF_TIMESTAMPING_TX_HARDWARE); | |
676 | sock_valbool_flag(sk, SOCK_TIMESTAMPING_TX_SOFTWARE, | |
677 | val & SOF_TIMESTAMPING_TX_SOFTWARE); | |
678 | sock_valbool_flag(sk, SOCK_TIMESTAMPING_RX_HARDWARE, | |
679 | val & SOF_TIMESTAMPING_RX_HARDWARE); | |
680 | if (val & SOF_TIMESTAMPING_RX_SOFTWARE) | |
681 | sock_enable_timestamp(sk, | |
682 | SOCK_TIMESTAMPING_RX_SOFTWARE); | |
683 | else | |
684 | sock_disable_timestamp(sk, | |
685 | SOCK_TIMESTAMPING_RX_SOFTWARE); | |
686 | sock_valbool_flag(sk, SOCK_TIMESTAMPING_SOFTWARE, | |
687 | val & SOF_TIMESTAMPING_SOFTWARE); | |
688 | sock_valbool_flag(sk, SOCK_TIMESTAMPING_SYS_HARDWARE, | |
689 | val & SOF_TIMESTAMPING_SYS_HARDWARE); | |
690 | sock_valbool_flag(sk, SOCK_TIMESTAMPING_RAW_HARDWARE, | |
691 | val & SOF_TIMESTAMPING_RAW_HARDWARE); | |
692 | break; | |
693 | ||
e71a4783 SH |
694 | case SO_RCVLOWAT: |
695 | if (val < 0) | |
696 | val = INT_MAX; | |
697 | sk->sk_rcvlowat = val ? : 1; | |
698 | break; | |
699 | ||
700 | case SO_RCVTIMEO: | |
701 | ret = sock_set_timeout(&sk->sk_rcvtimeo, optval, optlen); | |
702 | break; | |
703 | ||
704 | case SO_SNDTIMEO: | |
705 | ret = sock_set_timeout(&sk->sk_sndtimeo, optval, optlen); | |
706 | break; | |
1da177e4 | 707 | |
e71a4783 SH |
708 | case SO_ATTACH_FILTER: |
709 | ret = -EINVAL; | |
710 | if (optlen == sizeof(struct sock_fprog)) { | |
711 | struct sock_fprog fprog; | |
1da177e4 | 712 | |
e71a4783 SH |
713 | ret = -EFAULT; |
714 | if (copy_from_user(&fprog, optval, sizeof(fprog))) | |
1da177e4 | 715 | break; |
e71a4783 SH |
716 | |
717 | ret = sk_attach_filter(&fprog, sk); | |
718 | } | |
719 | break; | |
720 | ||
721 | case SO_DETACH_FILTER: | |
55b33325 | 722 | ret = sk_detach_filter(sk); |
e71a4783 | 723 | break; |
1da177e4 | 724 | |
e71a4783 SH |
725 | case SO_PASSSEC: |
726 | if (valbool) | |
727 | set_bit(SOCK_PASSSEC, &sock->flags); | |
728 | else | |
729 | clear_bit(SOCK_PASSSEC, &sock->flags); | |
730 | break; | |
4a19ec58 LAT |
731 | case SO_MARK: |
732 | if (!capable(CAP_NET_ADMIN)) | |
733 | ret = -EPERM; | |
2a91525c | 734 | else |
4a19ec58 | 735 | sk->sk_mark = val; |
4a19ec58 | 736 | break; |
877ce7c1 | 737 | |
1da177e4 LT |
738 | /* We implement the SO_SNDLOWAT etc to |
739 | not be settable (1003.1g 5.3) */ | |
3b885787 | 740 | case SO_RXQ_OVFL: |
8083f0fc | 741 | sock_valbool_flag(sk, SOCK_RXQ_OVFL, valbool); |
3b885787 | 742 | break; |
e71a4783 SH |
743 | default: |
744 | ret = -ENOPROTOOPT; | |
745 | break; | |
4ec93edb | 746 | } |
1da177e4 LT |
747 | release_sock(sk); |
748 | return ret; | |
749 | } | |
2a91525c | 750 | EXPORT_SYMBOL(sock_setsockopt); |
1da177e4 LT |
751 | |
752 | ||
3f551f94 EB |
753 | void cred_to_ucred(struct pid *pid, const struct cred *cred, |
754 | struct ucred *ucred) | |
755 | { | |
756 | ucred->pid = pid_vnr(pid); | |
757 | ucred->uid = ucred->gid = -1; | |
758 | if (cred) { | |
759 | struct user_namespace *current_ns = current_user_ns(); | |
760 | ||
761 | ucred->uid = user_ns_map_uid(current_ns, cred, cred->euid); | |
762 | ucred->gid = user_ns_map_gid(current_ns, cred, cred->egid); | |
763 | } | |
764 | } | |
3924773a | 765 | EXPORT_SYMBOL_GPL(cred_to_ucred); |
3f551f94 | 766 | |
1da177e4 LT |
767 | int sock_getsockopt(struct socket *sock, int level, int optname, |
768 | char __user *optval, int __user *optlen) | |
769 | { | |
770 | struct sock *sk = sock->sk; | |
4ec93edb | 771 | |
e71a4783 | 772 | union { |
4ec93edb YH |
773 | int val; |
774 | struct linger ling; | |
1da177e4 LT |
775 | struct timeval tm; |
776 | } v; | |
4ec93edb | 777 | |
4d0392be | 778 | int lv = sizeof(int); |
1da177e4 | 779 | int len; |
4ec93edb | 780 | |
e71a4783 | 781 | if (get_user(len, optlen)) |
4ec93edb | 782 | return -EFAULT; |
e71a4783 | 783 | if (len < 0) |
1da177e4 | 784 | return -EINVAL; |
4ec93edb | 785 | |
50fee1de | 786 | memset(&v, 0, sizeof(v)); |
df0bca04 | 787 | |
2a91525c | 788 | switch (optname) { |
e71a4783 SH |
789 | case SO_DEBUG: |
790 | v.val = sock_flag(sk, SOCK_DBG); | |
791 | break; | |
792 | ||
793 | case SO_DONTROUTE: | |
794 | v.val = sock_flag(sk, SOCK_LOCALROUTE); | |
795 | break; | |
796 | ||
797 | case SO_BROADCAST: | |
798 | v.val = !!sock_flag(sk, SOCK_BROADCAST); | |
799 | break; | |
800 | ||
801 | case SO_SNDBUF: | |
802 | v.val = sk->sk_sndbuf; | |
803 | break; | |
804 | ||
805 | case SO_RCVBUF: | |
806 | v.val = sk->sk_rcvbuf; | |
807 | break; | |
808 | ||
809 | case SO_REUSEADDR: | |
810 | v.val = sk->sk_reuse; | |
811 | break; | |
812 | ||
813 | case SO_KEEPALIVE: | |
814 | v.val = !!sock_flag(sk, SOCK_KEEPOPEN); | |
815 | break; | |
816 | ||
817 | case SO_TYPE: | |
818 | v.val = sk->sk_type; | |
819 | break; | |
820 | ||
49c794e9 JE |
821 | case SO_PROTOCOL: |
822 | v.val = sk->sk_protocol; | |
823 | break; | |
824 | ||
0d6038ee JE |
825 | case SO_DOMAIN: |
826 | v.val = sk->sk_family; | |
827 | break; | |
828 | ||
e71a4783 SH |
829 | case SO_ERROR: |
830 | v.val = -sock_error(sk); | |
2a91525c | 831 | if (v.val == 0) |
e71a4783 SH |
832 | v.val = xchg(&sk->sk_err_soft, 0); |
833 | break; | |
834 | ||
835 | case SO_OOBINLINE: | |
836 | v.val = !!sock_flag(sk, SOCK_URGINLINE); | |
837 | break; | |
838 | ||
839 | case SO_NO_CHECK: | |
840 | v.val = sk->sk_no_check; | |
841 | break; | |
842 | ||
843 | case SO_PRIORITY: | |
844 | v.val = sk->sk_priority; | |
845 | break; | |
846 | ||
847 | case SO_LINGER: | |
848 | lv = sizeof(v.ling); | |
849 | v.ling.l_onoff = !!sock_flag(sk, SOCK_LINGER); | |
850 | v.ling.l_linger = sk->sk_lingertime / HZ; | |
851 | break; | |
852 | ||
853 | case SO_BSDCOMPAT: | |
854 | sock_warn_obsolete_bsdism("getsockopt"); | |
855 | break; | |
856 | ||
857 | case SO_TIMESTAMP: | |
92f37fd2 ED |
858 | v.val = sock_flag(sk, SOCK_RCVTSTAMP) && |
859 | !sock_flag(sk, SOCK_RCVTSTAMPNS); | |
860 | break; | |
861 | ||
862 | case SO_TIMESTAMPNS: | |
863 | v.val = sock_flag(sk, SOCK_RCVTSTAMPNS); | |
e71a4783 SH |
864 | break; |
865 | ||
20d49473 PO |
866 | case SO_TIMESTAMPING: |
867 | v.val = 0; | |
868 | if (sock_flag(sk, SOCK_TIMESTAMPING_TX_HARDWARE)) | |
869 | v.val |= SOF_TIMESTAMPING_TX_HARDWARE; | |
870 | if (sock_flag(sk, SOCK_TIMESTAMPING_TX_SOFTWARE)) | |
871 | v.val |= SOF_TIMESTAMPING_TX_SOFTWARE; | |
872 | if (sock_flag(sk, SOCK_TIMESTAMPING_RX_HARDWARE)) | |
873 | v.val |= SOF_TIMESTAMPING_RX_HARDWARE; | |
874 | if (sock_flag(sk, SOCK_TIMESTAMPING_RX_SOFTWARE)) | |
875 | v.val |= SOF_TIMESTAMPING_RX_SOFTWARE; | |
876 | if (sock_flag(sk, SOCK_TIMESTAMPING_SOFTWARE)) | |
877 | v.val |= SOF_TIMESTAMPING_SOFTWARE; | |
878 | if (sock_flag(sk, SOCK_TIMESTAMPING_SYS_HARDWARE)) | |
879 | v.val |= SOF_TIMESTAMPING_SYS_HARDWARE; | |
880 | if (sock_flag(sk, SOCK_TIMESTAMPING_RAW_HARDWARE)) | |
881 | v.val |= SOF_TIMESTAMPING_RAW_HARDWARE; | |
882 | break; | |
883 | ||
e71a4783 | 884 | case SO_RCVTIMEO: |
2a91525c | 885 | lv = sizeof(struct timeval); |
e71a4783 SH |
886 | if (sk->sk_rcvtimeo == MAX_SCHEDULE_TIMEOUT) { |
887 | v.tm.tv_sec = 0; | |
888 | v.tm.tv_usec = 0; | |
889 | } else { | |
890 | v.tm.tv_sec = sk->sk_rcvtimeo / HZ; | |
891 | v.tm.tv_usec = ((sk->sk_rcvtimeo % HZ) * 1000000) / HZ; | |
892 | } | |
893 | break; | |
894 | ||
895 | case SO_SNDTIMEO: | |
2a91525c | 896 | lv = sizeof(struct timeval); |
e71a4783 SH |
897 | if (sk->sk_sndtimeo == MAX_SCHEDULE_TIMEOUT) { |
898 | v.tm.tv_sec = 0; | |
899 | v.tm.tv_usec = 0; | |
900 | } else { | |
901 | v.tm.tv_sec = sk->sk_sndtimeo / HZ; | |
902 | v.tm.tv_usec = ((sk->sk_sndtimeo % HZ) * 1000000) / HZ; | |
903 | } | |
904 | break; | |
1da177e4 | 905 | |
e71a4783 SH |
906 | case SO_RCVLOWAT: |
907 | v.val = sk->sk_rcvlowat; | |
908 | break; | |
1da177e4 | 909 | |
e71a4783 | 910 | case SO_SNDLOWAT: |
2a91525c | 911 | v.val = 1; |
e71a4783 | 912 | break; |
1da177e4 | 913 | |
e71a4783 SH |
914 | case SO_PASSCRED: |
915 | v.val = test_bit(SOCK_PASSCRED, &sock->flags) ? 1 : 0; | |
916 | break; | |
1da177e4 | 917 | |
e71a4783 | 918 | case SO_PEERCRED: |
109f6e39 EB |
919 | { |
920 | struct ucred peercred; | |
921 | if (len > sizeof(peercred)) | |
922 | len = sizeof(peercred); | |
923 | cred_to_ucred(sk->sk_peer_pid, sk->sk_peer_cred, &peercred); | |
924 | if (copy_to_user(optval, &peercred, len)) | |
e71a4783 SH |
925 | return -EFAULT; |
926 | goto lenout; | |
109f6e39 | 927 | } |
1da177e4 | 928 | |
e71a4783 SH |
929 | case SO_PEERNAME: |
930 | { | |
931 | char address[128]; | |
932 | ||
933 | if (sock->ops->getname(sock, (struct sockaddr *)address, &lv, 2)) | |
934 | return -ENOTCONN; | |
935 | if (lv < len) | |
936 | return -EINVAL; | |
937 | if (copy_to_user(optval, address, len)) | |
938 | return -EFAULT; | |
939 | goto lenout; | |
940 | } | |
1da177e4 | 941 | |
e71a4783 SH |
942 | /* Dubious BSD thing... Probably nobody even uses it, but |
943 | * the UNIX standard wants it for whatever reason... -DaveM | |
944 | */ | |
945 | case SO_ACCEPTCONN: | |
946 | v.val = sk->sk_state == TCP_LISTEN; | |
947 | break; | |
1da177e4 | 948 | |
e71a4783 SH |
949 | case SO_PASSSEC: |
950 | v.val = test_bit(SOCK_PASSSEC, &sock->flags) ? 1 : 0; | |
951 | break; | |
877ce7c1 | 952 | |
e71a4783 SH |
953 | case SO_PEERSEC: |
954 | return security_socket_getpeersec_stream(sock, optval, optlen, len); | |
1da177e4 | 955 | |
4a19ec58 LAT |
956 | case SO_MARK: |
957 | v.val = sk->sk_mark; | |
958 | break; | |
959 | ||
3b885787 NH |
960 | case SO_RXQ_OVFL: |
961 | v.val = !!sock_flag(sk, SOCK_RXQ_OVFL); | |
962 | break; | |
963 | ||
e71a4783 SH |
964 | default: |
965 | return -ENOPROTOOPT; | |
1da177e4 | 966 | } |
e71a4783 | 967 | |
1da177e4 LT |
968 | if (len > lv) |
969 | len = lv; | |
970 | if (copy_to_user(optval, &v, len)) | |
971 | return -EFAULT; | |
972 | lenout: | |
4ec93edb YH |
973 | if (put_user(len, optlen)) |
974 | return -EFAULT; | |
975 | return 0; | |
1da177e4 LT |
976 | } |
977 | ||
a5b5bb9a IM |
978 | /* |
979 | * Initialize an sk_lock. | |
980 | * | |
981 | * (We also register the sk_lock with the lock validator.) | |
982 | */ | |
b6f99a21 | 983 | static inline void sock_lock_init(struct sock *sk) |
a5b5bb9a | 984 | { |
ed07536e PZ |
985 | sock_lock_init_class_and_name(sk, |
986 | af_family_slock_key_strings[sk->sk_family], | |
987 | af_family_slock_keys + sk->sk_family, | |
988 | af_family_key_strings[sk->sk_family], | |
989 | af_family_keys + sk->sk_family); | |
a5b5bb9a IM |
990 | } |
991 | ||
4dc6dc71 ED |
992 | /* |
993 | * Copy all fields from osk to nsk but nsk->sk_refcnt must not change yet, | |
994 | * even temporarly, because of RCU lookups. sk_node should also be left as is. | |
68835aba | 995 | * We must not copy fields between sk_dontcopy_begin and sk_dontcopy_end |
4dc6dc71 | 996 | */ |
f1a6c4da PE |
997 | static void sock_copy(struct sock *nsk, const struct sock *osk) |
998 | { | |
999 | #ifdef CONFIG_SECURITY_NETWORK | |
1000 | void *sptr = nsk->sk_security; | |
1001 | #endif | |
68835aba ED |
1002 | memcpy(nsk, osk, offsetof(struct sock, sk_dontcopy_begin)); |
1003 | ||
1004 | memcpy(&nsk->sk_dontcopy_end, &osk->sk_dontcopy_end, | |
1005 | osk->sk_prot->obj_size - offsetof(struct sock, sk_dontcopy_end)); | |
1006 | ||
f1a6c4da PE |
1007 | #ifdef CONFIG_SECURITY_NETWORK |
1008 | nsk->sk_security = sptr; | |
1009 | security_sk_clone(osk, nsk); | |
1010 | #endif | |
1011 | } | |
1012 | ||
fcbdf09d OP |
1013 | /* |
1014 | * caches using SLAB_DESTROY_BY_RCU should let .next pointer from nulls nodes | |
1015 | * un-modified. Special care is taken when initializing object to zero. | |
1016 | */ | |
1017 | static inline void sk_prot_clear_nulls(struct sock *sk, int size) | |
1018 | { | |
1019 | if (offsetof(struct sock, sk_node.next) != 0) | |
1020 | memset(sk, 0, offsetof(struct sock, sk_node.next)); | |
1021 | memset(&sk->sk_node.pprev, 0, | |
1022 | size - offsetof(struct sock, sk_node.pprev)); | |
1023 | } | |
1024 | ||
1025 | void sk_prot_clear_portaddr_nulls(struct sock *sk, int size) | |
1026 | { | |
1027 | unsigned long nulls1, nulls2; | |
1028 | ||
1029 | nulls1 = offsetof(struct sock, __sk_common.skc_node.next); | |
1030 | nulls2 = offsetof(struct sock, __sk_common.skc_portaddr_node.next); | |
1031 | if (nulls1 > nulls2) | |
1032 | swap(nulls1, nulls2); | |
1033 | ||
1034 | if (nulls1 != 0) | |
1035 | memset((char *)sk, 0, nulls1); | |
1036 | memset((char *)sk + nulls1 + sizeof(void *), 0, | |
1037 | nulls2 - nulls1 - sizeof(void *)); | |
1038 | memset((char *)sk + nulls2 + sizeof(void *), 0, | |
1039 | size - nulls2 - sizeof(void *)); | |
1040 | } | |
1041 | EXPORT_SYMBOL(sk_prot_clear_portaddr_nulls); | |
1042 | ||
2e4afe7b PE |
1043 | static struct sock *sk_prot_alloc(struct proto *prot, gfp_t priority, |
1044 | int family) | |
c308c1b2 PE |
1045 | { |
1046 | struct sock *sk; | |
1047 | struct kmem_cache *slab; | |
1048 | ||
1049 | slab = prot->slab; | |
e912b114 ED |
1050 | if (slab != NULL) { |
1051 | sk = kmem_cache_alloc(slab, priority & ~__GFP_ZERO); | |
1052 | if (!sk) | |
1053 | return sk; | |
1054 | if (priority & __GFP_ZERO) { | |
fcbdf09d OP |
1055 | if (prot->clear_sk) |
1056 | prot->clear_sk(sk, prot->obj_size); | |
1057 | else | |
1058 | sk_prot_clear_nulls(sk, prot->obj_size); | |
e912b114 | 1059 | } |
fcbdf09d | 1060 | } else |
c308c1b2 PE |
1061 | sk = kmalloc(prot->obj_size, priority); |
1062 | ||
2e4afe7b | 1063 | if (sk != NULL) { |
a98b65a3 VN |
1064 | kmemcheck_annotate_bitfield(sk, flags); |
1065 | ||
2e4afe7b PE |
1066 | if (security_sk_alloc(sk, family, priority)) |
1067 | goto out_free; | |
1068 | ||
1069 | if (!try_module_get(prot->owner)) | |
1070 | goto out_free_sec; | |
e022f0b4 | 1071 | sk_tx_queue_clear(sk); |
2e4afe7b PE |
1072 | } |
1073 | ||
c308c1b2 | 1074 | return sk; |
2e4afe7b PE |
1075 | |
1076 | out_free_sec: | |
1077 | security_sk_free(sk); | |
1078 | out_free: | |
1079 | if (slab != NULL) | |
1080 | kmem_cache_free(slab, sk); | |
1081 | else | |
1082 | kfree(sk); | |
1083 | return NULL; | |
c308c1b2 PE |
1084 | } |
1085 | ||
1086 | static void sk_prot_free(struct proto *prot, struct sock *sk) | |
1087 | { | |
1088 | struct kmem_cache *slab; | |
2e4afe7b | 1089 | struct module *owner; |
c308c1b2 | 1090 | |
2e4afe7b | 1091 | owner = prot->owner; |
c308c1b2 | 1092 | slab = prot->slab; |
2e4afe7b PE |
1093 | |
1094 | security_sk_free(sk); | |
c308c1b2 PE |
1095 | if (slab != NULL) |
1096 | kmem_cache_free(slab, sk); | |
1097 | else | |
1098 | kfree(sk); | |
2e4afe7b | 1099 | module_put(owner); |
c308c1b2 PE |
1100 | } |
1101 | ||
f8451725 HX |
1102 | #ifdef CONFIG_CGROUPS |
1103 | void sock_update_classid(struct sock *sk) | |
1104 | { | |
1144182a | 1105 | u32 classid; |
f8451725 | 1106 | |
1144182a PM |
1107 | rcu_read_lock(); /* doing current task, which cannot vanish. */ |
1108 | classid = task_cls_classid(current); | |
1109 | rcu_read_unlock(); | |
f8451725 HX |
1110 | if (classid && classid != sk->sk_classid) |
1111 | sk->sk_classid = classid; | |
1112 | } | |
82862742 | 1113 | EXPORT_SYMBOL(sock_update_classid); |
f8451725 HX |
1114 | #endif |
1115 | ||
1da177e4 LT |
1116 | /** |
1117 | * sk_alloc - All socket objects are allocated here | |
c4ea43c5 | 1118 | * @net: the applicable net namespace |
4dc3b16b PP |
1119 | * @family: protocol family |
1120 | * @priority: for allocation (%GFP_KERNEL, %GFP_ATOMIC, etc) | |
1121 | * @prot: struct proto associated with this new sock instance | |
1da177e4 | 1122 | */ |
1b8d7ae4 | 1123 | struct sock *sk_alloc(struct net *net, int family, gfp_t priority, |
6257ff21 | 1124 | struct proto *prot) |
1da177e4 | 1125 | { |
c308c1b2 | 1126 | struct sock *sk; |
1da177e4 | 1127 | |
154adbc8 | 1128 | sk = sk_prot_alloc(prot, priority | __GFP_ZERO, family); |
1da177e4 | 1129 | if (sk) { |
154adbc8 PE |
1130 | sk->sk_family = family; |
1131 | /* | |
1132 | * See comment in struct sock definition to understand | |
1133 | * why we need sk_prot_creator -acme | |
1134 | */ | |
1135 | sk->sk_prot = sk->sk_prot_creator = prot; | |
1136 | sock_lock_init(sk); | |
3b1e0a65 | 1137 | sock_net_set(sk, get_net(net)); |
d66ee058 | 1138 | atomic_set(&sk->sk_wmem_alloc, 1); |
f8451725 HX |
1139 | |
1140 | sock_update_classid(sk); | |
1da177e4 | 1141 | } |
a79af59e | 1142 | |
2e4afe7b | 1143 | return sk; |
1da177e4 | 1144 | } |
2a91525c | 1145 | EXPORT_SYMBOL(sk_alloc); |
1da177e4 | 1146 | |
2b85a34e | 1147 | static void __sk_free(struct sock *sk) |
1da177e4 LT |
1148 | { |
1149 | struct sk_filter *filter; | |
1da177e4 LT |
1150 | |
1151 | if (sk->sk_destruct) | |
1152 | sk->sk_destruct(sk); | |
1153 | ||
a898def2 PM |
1154 | filter = rcu_dereference_check(sk->sk_filter, |
1155 | atomic_read(&sk->sk_wmem_alloc) == 0); | |
1da177e4 | 1156 | if (filter) { |
309dd5fc | 1157 | sk_filter_uncharge(sk, filter); |
a9b3cd7f | 1158 | RCU_INIT_POINTER(sk->sk_filter, NULL); |
1da177e4 LT |
1159 | } |
1160 | ||
20d49473 PO |
1161 | sock_disable_timestamp(sk, SOCK_TIMESTAMP); |
1162 | sock_disable_timestamp(sk, SOCK_TIMESTAMPING_RX_SOFTWARE); | |
1da177e4 LT |
1163 | |
1164 | if (atomic_read(&sk->sk_omem_alloc)) | |
1165 | printk(KERN_DEBUG "%s: optmem leakage (%d bytes) detected.\n", | |
0dc47877 | 1166 | __func__, atomic_read(&sk->sk_omem_alloc)); |
1da177e4 | 1167 | |
109f6e39 EB |
1168 | if (sk->sk_peer_cred) |
1169 | put_cred(sk->sk_peer_cred); | |
1170 | put_pid(sk->sk_peer_pid); | |
3b1e0a65 | 1171 | put_net(sock_net(sk)); |
c308c1b2 | 1172 | sk_prot_free(sk->sk_prot_creator, sk); |
1da177e4 | 1173 | } |
2b85a34e ED |
1174 | |
1175 | void sk_free(struct sock *sk) | |
1176 | { | |
1177 | /* | |
25985edc | 1178 | * We subtract one from sk_wmem_alloc and can know if |
2b85a34e ED |
1179 | * some packets are still in some tx queue. |
1180 | * If not null, sock_wfree() will call __sk_free(sk) later | |
1181 | */ | |
1182 | if (atomic_dec_and_test(&sk->sk_wmem_alloc)) | |
1183 | __sk_free(sk); | |
1184 | } | |
2a91525c | 1185 | EXPORT_SYMBOL(sk_free); |
1da177e4 | 1186 | |
edf02087 | 1187 | /* |
25985edc LDM |
1188 | * Last sock_put should drop reference to sk->sk_net. It has already |
1189 | * been dropped in sk_change_net. Taking reference to stopping namespace | |
edf02087 | 1190 | * is not an option. |
25985edc | 1191 | * Take reference to a socket to remove it from hash _alive_ and after that |
edf02087 DL |
1192 | * destroy it in the context of init_net. |
1193 | */ | |
1194 | void sk_release_kernel(struct sock *sk) | |
1195 | { | |
1196 | if (sk == NULL || sk->sk_socket == NULL) | |
1197 | return; | |
1198 | ||
1199 | sock_hold(sk); | |
1200 | sock_release(sk->sk_socket); | |
65a18ec5 | 1201 | release_net(sock_net(sk)); |
3b1e0a65 | 1202 | sock_net_set(sk, get_net(&init_net)); |
edf02087 DL |
1203 | sock_put(sk); |
1204 | } | |
45af1754 | 1205 | EXPORT_SYMBOL(sk_release_kernel); |
edf02087 | 1206 | |
dd0fc66f | 1207 | struct sock *sk_clone(const struct sock *sk, const gfp_t priority) |
87d11ceb | 1208 | { |
8fd1d178 | 1209 | struct sock *newsk; |
87d11ceb | 1210 | |
8fd1d178 | 1211 | newsk = sk_prot_alloc(sk->sk_prot, priority, sk->sk_family); |
87d11ceb ACM |
1212 | if (newsk != NULL) { |
1213 | struct sk_filter *filter; | |
1214 | ||
892c141e | 1215 | sock_copy(newsk, sk); |
87d11ceb ACM |
1216 | |
1217 | /* SANITY */ | |
3b1e0a65 | 1218 | get_net(sock_net(newsk)); |
87d11ceb ACM |
1219 | sk_node_init(&newsk->sk_node); |
1220 | sock_lock_init(newsk); | |
1221 | bh_lock_sock(newsk); | |
fa438ccf | 1222 | newsk->sk_backlog.head = newsk->sk_backlog.tail = NULL; |
8eae939f | 1223 | newsk->sk_backlog.len = 0; |
87d11ceb ACM |
1224 | |
1225 | atomic_set(&newsk->sk_rmem_alloc, 0); | |
2b85a34e ED |
1226 | /* |
1227 | * sk_wmem_alloc set to one (see sk_free() and sock_wfree()) | |
1228 | */ | |
1229 | atomic_set(&newsk->sk_wmem_alloc, 1); | |
87d11ceb ACM |
1230 | atomic_set(&newsk->sk_omem_alloc, 0); |
1231 | skb_queue_head_init(&newsk->sk_receive_queue); | |
1232 | skb_queue_head_init(&newsk->sk_write_queue); | |
97fc2f08 CL |
1233 | #ifdef CONFIG_NET_DMA |
1234 | skb_queue_head_init(&newsk->sk_async_wait_queue); | |
1235 | #endif | |
87d11ceb | 1236 | |
b6c6712a | 1237 | spin_lock_init(&newsk->sk_dst_lock); |
87d11ceb | 1238 | rwlock_init(&newsk->sk_callback_lock); |
443aef0e PZ |
1239 | lockdep_set_class_and_name(&newsk->sk_callback_lock, |
1240 | af_callback_keys + newsk->sk_family, | |
1241 | af_family_clock_key_strings[newsk->sk_family]); | |
87d11ceb ACM |
1242 | |
1243 | newsk->sk_dst_cache = NULL; | |
1244 | newsk->sk_wmem_queued = 0; | |
1245 | newsk->sk_forward_alloc = 0; | |
1246 | newsk->sk_send_head = NULL; | |
87d11ceb ACM |
1247 | newsk->sk_userlocks = sk->sk_userlocks & ~SOCK_BINDPORT_LOCK; |
1248 | ||
1249 | sock_reset_flag(newsk, SOCK_DONE); | |
1250 | skb_queue_head_init(&newsk->sk_error_queue); | |
1251 | ||
0d7da9dd | 1252 | filter = rcu_dereference_protected(newsk->sk_filter, 1); |
87d11ceb ACM |
1253 | if (filter != NULL) |
1254 | sk_filter_charge(newsk, filter); | |
1255 | ||
1256 | if (unlikely(xfrm_sk_clone_policy(newsk))) { | |
1257 | /* It is still raw copy of parent, so invalidate | |
1258 | * destructor and make plain sk_free() */ | |
1259 | newsk->sk_destruct = NULL; | |
b0691c8e | 1260 | bh_unlock_sock(newsk); |
87d11ceb ACM |
1261 | sk_free(newsk); |
1262 | newsk = NULL; | |
1263 | goto out; | |
1264 | } | |
1265 | ||
1266 | newsk->sk_err = 0; | |
1267 | newsk->sk_priority = 0; | |
4dc6dc71 ED |
1268 | /* |
1269 | * Before updating sk_refcnt, we must commit prior changes to memory | |
1270 | * (Documentation/RCU/rculist_nulls.txt for details) | |
1271 | */ | |
1272 | smp_wmb(); | |
87d11ceb ACM |
1273 | atomic_set(&newsk->sk_refcnt, 2); |
1274 | ||
1275 | /* | |
1276 | * Increment the counter in the same struct proto as the master | |
1277 | * sock (sk_refcnt_debug_inc uses newsk->sk_prot->socks, that | |
1278 | * is the same as sk->sk_prot->socks, as this field was copied | |
1279 | * with memcpy). | |
1280 | * | |
1281 | * This _changes_ the previous behaviour, where | |
1282 | * tcp_create_openreq_child always was incrementing the | |
1283 | * equivalent to tcp_prot->socks (inet_sock_nr), so this have | |
1284 | * to be taken into account in all callers. -acme | |
1285 | */ | |
1286 | sk_refcnt_debug_inc(newsk); | |
972692e0 | 1287 | sk_set_socket(newsk, NULL); |
43815482 | 1288 | newsk->sk_wq = NULL; |
87d11ceb ACM |
1289 | |
1290 | if (newsk->sk_prot->sockets_allocated) | |
1748376b | 1291 | percpu_counter_inc(newsk->sk_prot->sockets_allocated); |
704da560 OP |
1292 | |
1293 | if (sock_flag(newsk, SOCK_TIMESTAMP) || | |
1294 | sock_flag(newsk, SOCK_TIMESTAMPING_RX_SOFTWARE)) | |
1295 | net_enable_timestamp(); | |
87d11ceb ACM |
1296 | } |
1297 | out: | |
1298 | return newsk; | |
1299 | } | |
87d11ceb ACM |
1300 | EXPORT_SYMBOL_GPL(sk_clone); |
1301 | ||
9958089a AK |
1302 | void sk_setup_caps(struct sock *sk, struct dst_entry *dst) |
1303 | { | |
1304 | __sk_dst_set(sk, dst); | |
1305 | sk->sk_route_caps = dst->dev->features; | |
1306 | if (sk->sk_route_caps & NETIF_F_GSO) | |
4fcd6b99 | 1307 | sk->sk_route_caps |= NETIF_F_GSO_SOFTWARE; |
a465419b | 1308 | sk->sk_route_caps &= ~sk->sk_route_nocaps; |
9958089a | 1309 | if (sk_can_gso(sk)) { |
82cc1a7a | 1310 | if (dst->header_len) { |
9958089a | 1311 | sk->sk_route_caps &= ~NETIF_F_GSO_MASK; |
82cc1a7a | 1312 | } else { |
9958089a | 1313 | sk->sk_route_caps |= NETIF_F_SG | NETIF_F_HW_CSUM; |
82cc1a7a PWJ |
1314 | sk->sk_gso_max_size = dst->dev->gso_max_size; |
1315 | } | |
9958089a AK |
1316 | } |
1317 | } | |
1318 | EXPORT_SYMBOL_GPL(sk_setup_caps); | |
1319 | ||
1da177e4 LT |
1320 | void __init sk_init(void) |
1321 | { | |
4481374c | 1322 | if (totalram_pages <= 4096) { |
1da177e4 LT |
1323 | sysctl_wmem_max = 32767; |
1324 | sysctl_rmem_max = 32767; | |
1325 | sysctl_wmem_default = 32767; | |
1326 | sysctl_rmem_default = 32767; | |
4481374c | 1327 | } else if (totalram_pages >= 131072) { |
1da177e4 LT |
1328 | sysctl_wmem_max = 131071; |
1329 | sysctl_rmem_max = 131071; | |
1330 | } | |
1331 | } | |
1332 | ||
1333 | /* | |
1334 | * Simple resource managers for sockets. | |
1335 | */ | |
1336 | ||
1337 | ||
4ec93edb YH |
1338 | /* |
1339 | * Write buffer destructor automatically called from kfree_skb. | |
1da177e4 LT |
1340 | */ |
1341 | void sock_wfree(struct sk_buff *skb) | |
1342 | { | |
1343 | struct sock *sk = skb->sk; | |
d99927f4 | 1344 | unsigned int len = skb->truesize; |
1da177e4 | 1345 | |
d99927f4 ED |
1346 | if (!sock_flag(sk, SOCK_USE_WRITE_QUEUE)) { |
1347 | /* | |
1348 | * Keep a reference on sk_wmem_alloc, this will be released | |
1349 | * after sk_write_space() call | |
1350 | */ | |
1351 | atomic_sub(len - 1, &sk->sk_wmem_alloc); | |
1da177e4 | 1352 | sk->sk_write_space(sk); |
d99927f4 ED |
1353 | len = 1; |
1354 | } | |
2b85a34e | 1355 | /* |
d99927f4 ED |
1356 | * if sk_wmem_alloc reaches 0, we must finish what sk_free() |
1357 | * could not do because of in-flight packets | |
2b85a34e | 1358 | */ |
d99927f4 | 1359 | if (atomic_sub_and_test(len, &sk->sk_wmem_alloc)) |
2b85a34e | 1360 | __sk_free(sk); |
1da177e4 | 1361 | } |
2a91525c | 1362 | EXPORT_SYMBOL(sock_wfree); |
1da177e4 | 1363 | |
4ec93edb YH |
1364 | /* |
1365 | * Read buffer destructor automatically called from kfree_skb. | |
1da177e4 LT |
1366 | */ |
1367 | void sock_rfree(struct sk_buff *skb) | |
1368 | { | |
1369 | struct sock *sk = skb->sk; | |
d361fd59 | 1370 | unsigned int len = skb->truesize; |
1da177e4 | 1371 | |
d361fd59 ED |
1372 | atomic_sub(len, &sk->sk_rmem_alloc); |
1373 | sk_mem_uncharge(sk, len); | |
1da177e4 | 1374 | } |
2a91525c | 1375 | EXPORT_SYMBOL(sock_rfree); |
1da177e4 LT |
1376 | |
1377 | ||
1378 | int sock_i_uid(struct sock *sk) | |
1379 | { | |
1380 | int uid; | |
1381 | ||
f064af1e | 1382 | read_lock_bh(&sk->sk_callback_lock); |
1da177e4 | 1383 | uid = sk->sk_socket ? SOCK_INODE(sk->sk_socket)->i_uid : 0; |
f064af1e | 1384 | read_unlock_bh(&sk->sk_callback_lock); |
1da177e4 LT |
1385 | return uid; |
1386 | } | |
2a91525c | 1387 | EXPORT_SYMBOL(sock_i_uid); |
1da177e4 LT |
1388 | |
1389 | unsigned long sock_i_ino(struct sock *sk) | |
1390 | { | |
1391 | unsigned long ino; | |
1392 | ||
f064af1e | 1393 | read_lock_bh(&sk->sk_callback_lock); |
1da177e4 | 1394 | ino = sk->sk_socket ? SOCK_INODE(sk->sk_socket)->i_ino : 0; |
f064af1e | 1395 | read_unlock_bh(&sk->sk_callback_lock); |
1da177e4 LT |
1396 | return ino; |
1397 | } | |
2a91525c | 1398 | EXPORT_SYMBOL(sock_i_ino); |
1da177e4 LT |
1399 | |
1400 | /* | |
1401 | * Allocate a skb from the socket's send buffer. | |
1402 | */ | |
86a76caf | 1403 | struct sk_buff *sock_wmalloc(struct sock *sk, unsigned long size, int force, |
dd0fc66f | 1404 | gfp_t priority) |
1da177e4 LT |
1405 | { |
1406 | if (force || atomic_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf) { | |
2a91525c | 1407 | struct sk_buff *skb = alloc_skb(size, priority); |
1da177e4 LT |
1408 | if (skb) { |
1409 | skb_set_owner_w(skb, sk); | |
1410 | return skb; | |
1411 | } | |
1412 | } | |
1413 | return NULL; | |
1414 | } | |
2a91525c | 1415 | EXPORT_SYMBOL(sock_wmalloc); |
1da177e4 LT |
1416 | |
1417 | /* | |
1418 | * Allocate a skb from the socket's receive buffer. | |
4ec93edb | 1419 | */ |
86a76caf | 1420 | struct sk_buff *sock_rmalloc(struct sock *sk, unsigned long size, int force, |
dd0fc66f | 1421 | gfp_t priority) |
1da177e4 LT |
1422 | { |
1423 | if (force || atomic_read(&sk->sk_rmem_alloc) < sk->sk_rcvbuf) { | |
1424 | struct sk_buff *skb = alloc_skb(size, priority); | |
1425 | if (skb) { | |
1426 | skb_set_owner_r(skb, sk); | |
1427 | return skb; | |
1428 | } | |
1429 | } | |
1430 | return NULL; | |
1431 | } | |
1432 | ||
4ec93edb | 1433 | /* |
1da177e4 | 1434 | * Allocate a memory block from the socket's option memory buffer. |
4ec93edb | 1435 | */ |
dd0fc66f | 1436 | void *sock_kmalloc(struct sock *sk, int size, gfp_t priority) |
1da177e4 LT |
1437 | { |
1438 | if ((unsigned)size <= sysctl_optmem_max && | |
1439 | atomic_read(&sk->sk_omem_alloc) + size < sysctl_optmem_max) { | |
1440 | void *mem; | |
1441 | /* First do the add, to avoid the race if kmalloc | |
4ec93edb | 1442 | * might sleep. |
1da177e4 LT |
1443 | */ |
1444 | atomic_add(size, &sk->sk_omem_alloc); | |
1445 | mem = kmalloc(size, priority); | |
1446 | if (mem) | |
1447 | return mem; | |
1448 | atomic_sub(size, &sk->sk_omem_alloc); | |
1449 | } | |
1450 | return NULL; | |
1451 | } | |
2a91525c | 1452 | EXPORT_SYMBOL(sock_kmalloc); |
1da177e4 LT |
1453 | |
1454 | /* | |
1455 | * Free an option memory block. | |
1456 | */ | |
1457 | void sock_kfree_s(struct sock *sk, void *mem, int size) | |
1458 | { | |
1459 | kfree(mem); | |
1460 | atomic_sub(size, &sk->sk_omem_alloc); | |
1461 | } | |
2a91525c | 1462 | EXPORT_SYMBOL(sock_kfree_s); |
1da177e4 LT |
1463 | |
1464 | /* It is almost wait_for_tcp_memory minus release_sock/lock_sock. | |
1465 | I think, these locks should be removed for datagram sockets. | |
1466 | */ | |
2a91525c | 1467 | static long sock_wait_for_wmem(struct sock *sk, long timeo) |
1da177e4 LT |
1468 | { |
1469 | DEFINE_WAIT(wait); | |
1470 | ||
1471 | clear_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags); | |
1472 | for (;;) { | |
1473 | if (!timeo) | |
1474 | break; | |
1475 | if (signal_pending(current)) | |
1476 | break; | |
1477 | set_bit(SOCK_NOSPACE, &sk->sk_socket->flags); | |
aa395145 | 1478 | prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE); |
1da177e4 LT |
1479 | if (atomic_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf) |
1480 | break; | |
1481 | if (sk->sk_shutdown & SEND_SHUTDOWN) | |
1482 | break; | |
1483 | if (sk->sk_err) | |
1484 | break; | |
1485 | timeo = schedule_timeout(timeo); | |
1486 | } | |
aa395145 | 1487 | finish_wait(sk_sleep(sk), &wait); |
1da177e4 LT |
1488 | return timeo; |
1489 | } | |
1490 | ||
1491 | ||
1492 | /* | |
1493 | * Generic send/receive buffer handlers | |
1494 | */ | |
1495 | ||
4cc7f68d HX |
1496 | struct sk_buff *sock_alloc_send_pskb(struct sock *sk, unsigned long header_len, |
1497 | unsigned long data_len, int noblock, | |
1498 | int *errcode) | |
1da177e4 LT |
1499 | { |
1500 | struct sk_buff *skb; | |
7d877f3b | 1501 | gfp_t gfp_mask; |
1da177e4 LT |
1502 | long timeo; |
1503 | int err; | |
1504 | ||
1505 | gfp_mask = sk->sk_allocation; | |
1506 | if (gfp_mask & __GFP_WAIT) | |
1507 | gfp_mask |= __GFP_REPEAT; | |
1508 | ||
1509 | timeo = sock_sndtimeo(sk, noblock); | |
1510 | while (1) { | |
1511 | err = sock_error(sk); | |
1512 | if (err != 0) | |
1513 | goto failure; | |
1514 | ||
1515 | err = -EPIPE; | |
1516 | if (sk->sk_shutdown & SEND_SHUTDOWN) | |
1517 | goto failure; | |
1518 | ||
1519 | if (atomic_read(&sk->sk_wmem_alloc) < sk->sk_sndbuf) { | |
db38c179 | 1520 | skb = alloc_skb(header_len, gfp_mask); |
1da177e4 LT |
1521 | if (skb) { |
1522 | int npages; | |
1523 | int i; | |
1524 | ||
1525 | /* No pages, we're done... */ | |
1526 | if (!data_len) | |
1527 | break; | |
1528 | ||
1529 | npages = (data_len + (PAGE_SIZE - 1)) >> PAGE_SHIFT; | |
1530 | skb->truesize += data_len; | |
1531 | skb_shinfo(skb)->nr_frags = npages; | |
1532 | for (i = 0; i < npages; i++) { | |
1533 | struct page *page; | |
1da177e4 LT |
1534 | |
1535 | page = alloc_pages(sk->sk_allocation, 0); | |
1536 | if (!page) { | |
1537 | err = -ENOBUFS; | |
1538 | skb_shinfo(skb)->nr_frags = i; | |
1539 | kfree_skb(skb); | |
1540 | goto failure; | |
1541 | } | |
1542 | ||
ea2ab693 IC |
1543 | __skb_fill_page_desc(skb, i, |
1544 | page, 0, | |
1545 | (data_len >= PAGE_SIZE ? | |
1546 | PAGE_SIZE : | |
1547 | data_len)); | |
1da177e4 LT |
1548 | data_len -= PAGE_SIZE; |
1549 | } | |
1550 | ||
1551 | /* Full success... */ | |
1552 | break; | |
1553 | } | |
1554 | err = -ENOBUFS; | |
1555 | goto failure; | |
1556 | } | |
1557 | set_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags); | |
1558 | set_bit(SOCK_NOSPACE, &sk->sk_socket->flags); | |
1559 | err = -EAGAIN; | |
1560 | if (!timeo) | |
1561 | goto failure; | |
1562 | if (signal_pending(current)) | |
1563 | goto interrupted; | |
1564 | timeo = sock_wait_for_wmem(sk, timeo); | |
1565 | } | |
1566 | ||
1567 | skb_set_owner_w(skb, sk); | |
1568 | return skb; | |
1569 | ||
1570 | interrupted: | |
1571 | err = sock_intr_errno(timeo); | |
1572 | failure: | |
1573 | *errcode = err; | |
1574 | return NULL; | |
1575 | } | |
4cc7f68d | 1576 | EXPORT_SYMBOL(sock_alloc_send_pskb); |
1da177e4 | 1577 | |
4ec93edb | 1578 | struct sk_buff *sock_alloc_send_skb(struct sock *sk, unsigned long size, |
1da177e4 LT |
1579 | int noblock, int *errcode) |
1580 | { | |
1581 | return sock_alloc_send_pskb(sk, size, 0, noblock, errcode); | |
1582 | } | |
2a91525c | 1583 | EXPORT_SYMBOL(sock_alloc_send_skb); |
1da177e4 LT |
1584 | |
1585 | static void __lock_sock(struct sock *sk) | |
f39234d6 NK |
1586 | __releases(&sk->sk_lock.slock) |
1587 | __acquires(&sk->sk_lock.slock) | |
1da177e4 LT |
1588 | { |
1589 | DEFINE_WAIT(wait); | |
1590 | ||
e71a4783 | 1591 | for (;;) { |
1da177e4 LT |
1592 | prepare_to_wait_exclusive(&sk->sk_lock.wq, &wait, |
1593 | TASK_UNINTERRUPTIBLE); | |
1594 | spin_unlock_bh(&sk->sk_lock.slock); | |
1595 | schedule(); | |
1596 | spin_lock_bh(&sk->sk_lock.slock); | |
e71a4783 | 1597 | if (!sock_owned_by_user(sk)) |
1da177e4 LT |
1598 | break; |
1599 | } | |
1600 | finish_wait(&sk->sk_lock.wq, &wait); | |
1601 | } | |
1602 | ||
1603 | static void __release_sock(struct sock *sk) | |
f39234d6 NK |
1604 | __releases(&sk->sk_lock.slock) |
1605 | __acquires(&sk->sk_lock.slock) | |
1da177e4 LT |
1606 | { |
1607 | struct sk_buff *skb = sk->sk_backlog.head; | |
1608 | ||
1609 | do { | |
1610 | sk->sk_backlog.head = sk->sk_backlog.tail = NULL; | |
1611 | bh_unlock_sock(sk); | |
1612 | ||
1613 | do { | |
1614 | struct sk_buff *next = skb->next; | |
1615 | ||
7fee226a | 1616 | WARN_ON_ONCE(skb_dst_is_noref(skb)); |
1da177e4 | 1617 | skb->next = NULL; |
c57943a1 | 1618 | sk_backlog_rcv(sk, skb); |
1da177e4 LT |
1619 | |
1620 | /* | |
1621 | * We are in process context here with softirqs | |
1622 | * disabled, use cond_resched_softirq() to preempt. | |
1623 | * This is safe to do because we've taken the backlog | |
1624 | * queue private: | |
1625 | */ | |
1626 | cond_resched_softirq(); | |
1627 | ||
1628 | skb = next; | |
1629 | } while (skb != NULL); | |
1630 | ||
1631 | bh_lock_sock(sk); | |
e71a4783 | 1632 | } while ((skb = sk->sk_backlog.head) != NULL); |
8eae939f ZY |
1633 | |
1634 | /* | |
1635 | * Doing the zeroing here guarantee we can not loop forever | |
1636 | * while a wild producer attempts to flood us. | |
1637 | */ | |
1638 | sk->sk_backlog.len = 0; | |
1da177e4 LT |
1639 | } |
1640 | ||
1641 | /** | |
1642 | * sk_wait_data - wait for data to arrive at sk_receive_queue | |
4dc3b16b PP |
1643 | * @sk: sock to wait on |
1644 | * @timeo: for how long | |
1da177e4 LT |
1645 | * |
1646 | * Now socket state including sk->sk_err is changed only under lock, | |
1647 | * hence we may omit checks after joining wait queue. | |
1648 | * We check receive queue before schedule() only as optimization; | |
1649 | * it is very likely that release_sock() added new data. | |
1650 | */ | |
1651 | int sk_wait_data(struct sock *sk, long *timeo) | |
1652 | { | |
1653 | int rc; | |
1654 | DEFINE_WAIT(wait); | |
1655 | ||
aa395145 | 1656 | prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE); |
1da177e4 LT |
1657 | set_bit(SOCK_ASYNC_WAITDATA, &sk->sk_socket->flags); |
1658 | rc = sk_wait_event(sk, timeo, !skb_queue_empty(&sk->sk_receive_queue)); | |
1659 | clear_bit(SOCK_ASYNC_WAITDATA, &sk->sk_socket->flags); | |
aa395145 | 1660 | finish_wait(sk_sleep(sk), &wait); |
1da177e4 LT |
1661 | return rc; |
1662 | } | |
1da177e4 LT |
1663 | EXPORT_SYMBOL(sk_wait_data); |
1664 | ||
3ab224be HA |
1665 | /** |
1666 | * __sk_mem_schedule - increase sk_forward_alloc and memory_allocated | |
1667 | * @sk: socket | |
1668 | * @size: memory size to allocate | |
1669 | * @kind: allocation type | |
1670 | * | |
1671 | * If kind is SK_MEM_SEND, it means wmem allocation. Otherwise it means | |
1672 | * rmem allocation. This function assumes that protocols which have | |
1673 | * memory_pressure use sk_wmem_queued as write buffer accounting. | |
1674 | */ | |
1675 | int __sk_mem_schedule(struct sock *sk, int size, int kind) | |
1676 | { | |
1677 | struct proto *prot = sk->sk_prot; | |
1678 | int amt = sk_mem_pages(size); | |
8d987e5c | 1679 | long allocated; |
3ab224be HA |
1680 | |
1681 | sk->sk_forward_alloc += amt * SK_MEM_QUANTUM; | |
8d987e5c | 1682 | allocated = atomic_long_add_return(amt, prot->memory_allocated); |
3ab224be HA |
1683 | |
1684 | /* Under limit. */ | |
1685 | if (allocated <= prot->sysctl_mem[0]) { | |
1686 | if (prot->memory_pressure && *prot->memory_pressure) | |
1687 | *prot->memory_pressure = 0; | |
1688 | return 1; | |
1689 | } | |
1690 | ||
1691 | /* Under pressure. */ | |
1692 | if (allocated > prot->sysctl_mem[1]) | |
1693 | if (prot->enter_memory_pressure) | |
5c52ba17 | 1694 | prot->enter_memory_pressure(sk); |
3ab224be HA |
1695 | |
1696 | /* Over hard limit. */ | |
1697 | if (allocated > prot->sysctl_mem[2]) | |
1698 | goto suppress_allocation; | |
1699 | ||
1700 | /* guarantee minimum buffer size under pressure */ | |
1701 | if (kind == SK_MEM_RECV) { | |
1702 | if (atomic_read(&sk->sk_rmem_alloc) < prot->sysctl_rmem[0]) | |
1703 | return 1; | |
1704 | } else { /* SK_MEM_SEND */ | |
1705 | if (sk->sk_type == SOCK_STREAM) { | |
1706 | if (sk->sk_wmem_queued < prot->sysctl_wmem[0]) | |
1707 | return 1; | |
1708 | } else if (atomic_read(&sk->sk_wmem_alloc) < | |
1709 | prot->sysctl_wmem[0]) | |
1710 | return 1; | |
1711 | } | |
1712 | ||
1713 | if (prot->memory_pressure) { | |
1748376b ED |
1714 | int alloc; |
1715 | ||
1716 | if (!*prot->memory_pressure) | |
1717 | return 1; | |
1718 | alloc = percpu_counter_read_positive(prot->sockets_allocated); | |
1719 | if (prot->sysctl_mem[2] > alloc * | |
3ab224be HA |
1720 | sk_mem_pages(sk->sk_wmem_queued + |
1721 | atomic_read(&sk->sk_rmem_alloc) + | |
1722 | sk->sk_forward_alloc)) | |
1723 | return 1; | |
1724 | } | |
1725 | ||
1726 | suppress_allocation: | |
1727 | ||
1728 | if (kind == SK_MEM_SEND && sk->sk_type == SOCK_STREAM) { | |
1729 | sk_stream_moderate_sndbuf(sk); | |
1730 | ||
1731 | /* Fail only if socket is _under_ its sndbuf. | |
1732 | * In this case we cannot block, so that we have to fail. | |
1733 | */ | |
1734 | if (sk->sk_wmem_queued + size >= sk->sk_sndbuf) | |
1735 | return 1; | |
1736 | } | |
1737 | ||
3847ce32 SM |
1738 | trace_sock_exceed_buf_limit(sk, prot, allocated); |
1739 | ||
3ab224be HA |
1740 | /* Alas. Undo changes. */ |
1741 | sk->sk_forward_alloc -= amt * SK_MEM_QUANTUM; | |
8d987e5c | 1742 | atomic_long_sub(amt, prot->memory_allocated); |
3ab224be HA |
1743 | return 0; |
1744 | } | |
3ab224be HA |
1745 | EXPORT_SYMBOL(__sk_mem_schedule); |
1746 | ||
1747 | /** | |
1748 | * __sk_reclaim - reclaim memory_allocated | |
1749 | * @sk: socket | |
1750 | */ | |
1751 | void __sk_mem_reclaim(struct sock *sk) | |
1752 | { | |
1753 | struct proto *prot = sk->sk_prot; | |
1754 | ||
8d987e5c | 1755 | atomic_long_sub(sk->sk_forward_alloc >> SK_MEM_QUANTUM_SHIFT, |
3ab224be HA |
1756 | prot->memory_allocated); |
1757 | sk->sk_forward_alloc &= SK_MEM_QUANTUM - 1; | |
1758 | ||
1759 | if (prot->memory_pressure && *prot->memory_pressure && | |
8d987e5c | 1760 | (atomic_long_read(prot->memory_allocated) < prot->sysctl_mem[0])) |
3ab224be HA |
1761 | *prot->memory_pressure = 0; |
1762 | } | |
3ab224be HA |
1763 | EXPORT_SYMBOL(__sk_mem_reclaim); |
1764 | ||
1765 | ||
1da177e4 LT |
1766 | /* |
1767 | * Set of default routines for initialising struct proto_ops when | |
1768 | * the protocol does not support a particular function. In certain | |
1769 | * cases where it makes no sense for a protocol to have a "do nothing" | |
1770 | * function, some default processing is provided. | |
1771 | */ | |
1772 | ||
1773 | int sock_no_bind(struct socket *sock, struct sockaddr *saddr, int len) | |
1774 | { | |
1775 | return -EOPNOTSUPP; | |
1776 | } | |
2a91525c | 1777 | EXPORT_SYMBOL(sock_no_bind); |
1da177e4 | 1778 | |
4ec93edb | 1779 | int sock_no_connect(struct socket *sock, struct sockaddr *saddr, |
1da177e4 LT |
1780 | int len, int flags) |
1781 | { | |
1782 | return -EOPNOTSUPP; | |
1783 | } | |
2a91525c | 1784 | EXPORT_SYMBOL(sock_no_connect); |
1da177e4 LT |
1785 | |
1786 | int sock_no_socketpair(struct socket *sock1, struct socket *sock2) | |
1787 | { | |
1788 | return -EOPNOTSUPP; | |
1789 | } | |
2a91525c | 1790 | EXPORT_SYMBOL(sock_no_socketpair); |
1da177e4 LT |
1791 | |
1792 | int sock_no_accept(struct socket *sock, struct socket *newsock, int flags) | |
1793 | { | |
1794 | return -EOPNOTSUPP; | |
1795 | } | |
2a91525c | 1796 | EXPORT_SYMBOL(sock_no_accept); |
1da177e4 | 1797 | |
4ec93edb | 1798 | int sock_no_getname(struct socket *sock, struct sockaddr *saddr, |
1da177e4 LT |
1799 | int *len, int peer) |
1800 | { | |
1801 | return -EOPNOTSUPP; | |
1802 | } | |
2a91525c | 1803 | EXPORT_SYMBOL(sock_no_getname); |
1da177e4 | 1804 | |
2a91525c | 1805 | unsigned int sock_no_poll(struct file *file, struct socket *sock, poll_table *pt) |
1da177e4 LT |
1806 | { |
1807 | return 0; | |
1808 | } | |
2a91525c | 1809 | EXPORT_SYMBOL(sock_no_poll); |
1da177e4 LT |
1810 | |
1811 | int sock_no_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg) | |
1812 | { | |
1813 | return -EOPNOTSUPP; | |
1814 | } | |
2a91525c | 1815 | EXPORT_SYMBOL(sock_no_ioctl); |
1da177e4 LT |
1816 | |
1817 | int sock_no_listen(struct socket *sock, int backlog) | |
1818 | { | |
1819 | return -EOPNOTSUPP; | |
1820 | } | |
2a91525c | 1821 | EXPORT_SYMBOL(sock_no_listen); |
1da177e4 LT |
1822 | |
1823 | int sock_no_shutdown(struct socket *sock, int how) | |
1824 | { | |
1825 | return -EOPNOTSUPP; | |
1826 | } | |
2a91525c | 1827 | EXPORT_SYMBOL(sock_no_shutdown); |
1da177e4 LT |
1828 | |
1829 | int sock_no_setsockopt(struct socket *sock, int level, int optname, | |
b7058842 | 1830 | char __user *optval, unsigned int optlen) |
1da177e4 LT |
1831 | { |
1832 | return -EOPNOTSUPP; | |
1833 | } | |
2a91525c | 1834 | EXPORT_SYMBOL(sock_no_setsockopt); |
1da177e4 LT |
1835 | |
1836 | int sock_no_getsockopt(struct socket *sock, int level, int optname, | |
1837 | char __user *optval, int __user *optlen) | |
1838 | { | |
1839 | return -EOPNOTSUPP; | |
1840 | } | |
2a91525c | 1841 | EXPORT_SYMBOL(sock_no_getsockopt); |
1da177e4 LT |
1842 | |
1843 | int sock_no_sendmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *m, | |
1844 | size_t len) | |
1845 | { | |
1846 | return -EOPNOTSUPP; | |
1847 | } | |
2a91525c | 1848 | EXPORT_SYMBOL(sock_no_sendmsg); |
1da177e4 LT |
1849 | |
1850 | int sock_no_recvmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *m, | |
1851 | size_t len, int flags) | |
1852 | { | |
1853 | return -EOPNOTSUPP; | |
1854 | } | |
2a91525c | 1855 | EXPORT_SYMBOL(sock_no_recvmsg); |
1da177e4 LT |
1856 | |
1857 | int sock_no_mmap(struct file *file, struct socket *sock, struct vm_area_struct *vma) | |
1858 | { | |
1859 | /* Mirror missing mmap method error code */ | |
1860 | return -ENODEV; | |
1861 | } | |
2a91525c | 1862 | EXPORT_SYMBOL(sock_no_mmap); |
1da177e4 LT |
1863 | |
1864 | ssize_t sock_no_sendpage(struct socket *sock, struct page *page, int offset, size_t size, int flags) | |
1865 | { | |
1866 | ssize_t res; | |
1867 | struct msghdr msg = {.msg_flags = flags}; | |
1868 | struct kvec iov; | |
1869 | char *kaddr = kmap(page); | |
1870 | iov.iov_base = kaddr + offset; | |
1871 | iov.iov_len = size; | |
1872 | res = kernel_sendmsg(sock, &msg, &iov, 1, size); | |
1873 | kunmap(page); | |
1874 | return res; | |
1875 | } | |
2a91525c | 1876 | EXPORT_SYMBOL(sock_no_sendpage); |
1da177e4 LT |
1877 | |
1878 | /* | |
1879 | * Default Socket Callbacks | |
1880 | */ | |
1881 | ||
1882 | static void sock_def_wakeup(struct sock *sk) | |
1883 | { | |
43815482 ED |
1884 | struct socket_wq *wq; |
1885 | ||
1886 | rcu_read_lock(); | |
1887 | wq = rcu_dereference(sk->sk_wq); | |
1888 | if (wq_has_sleeper(wq)) | |
1889 | wake_up_interruptible_all(&wq->wait); | |
1890 | rcu_read_unlock(); | |
1da177e4 LT |
1891 | } |
1892 | ||
1893 | static void sock_def_error_report(struct sock *sk) | |
1894 | { | |
43815482 ED |
1895 | struct socket_wq *wq; |
1896 | ||
1897 | rcu_read_lock(); | |
1898 | wq = rcu_dereference(sk->sk_wq); | |
1899 | if (wq_has_sleeper(wq)) | |
1900 | wake_up_interruptible_poll(&wq->wait, POLLERR); | |
8d8ad9d7 | 1901 | sk_wake_async(sk, SOCK_WAKE_IO, POLL_ERR); |
43815482 | 1902 | rcu_read_unlock(); |
1da177e4 LT |
1903 | } |
1904 | ||
1905 | static void sock_def_readable(struct sock *sk, int len) | |
1906 | { | |
43815482 ED |
1907 | struct socket_wq *wq; |
1908 | ||
1909 | rcu_read_lock(); | |
1910 | wq = rcu_dereference(sk->sk_wq); | |
1911 | if (wq_has_sleeper(wq)) | |
2c6607c6 | 1912 | wake_up_interruptible_sync_poll(&wq->wait, POLLIN | POLLPRI | |
37e5540b | 1913 | POLLRDNORM | POLLRDBAND); |
8d8ad9d7 | 1914 | sk_wake_async(sk, SOCK_WAKE_WAITD, POLL_IN); |
43815482 | 1915 | rcu_read_unlock(); |
1da177e4 LT |
1916 | } |
1917 | ||
1918 | static void sock_def_write_space(struct sock *sk) | |
1919 | { | |
43815482 ED |
1920 | struct socket_wq *wq; |
1921 | ||
1922 | rcu_read_lock(); | |
1da177e4 LT |
1923 | |
1924 | /* Do not wake up a writer until he can make "significant" | |
1925 | * progress. --DaveM | |
1926 | */ | |
e71a4783 | 1927 | if ((atomic_read(&sk->sk_wmem_alloc) << 1) <= sk->sk_sndbuf) { |
43815482 ED |
1928 | wq = rcu_dereference(sk->sk_wq); |
1929 | if (wq_has_sleeper(wq)) | |
1930 | wake_up_interruptible_sync_poll(&wq->wait, POLLOUT | | |
37e5540b | 1931 | POLLWRNORM | POLLWRBAND); |
1da177e4 LT |
1932 | |
1933 | /* Should agree with poll, otherwise some programs break */ | |
1934 | if (sock_writeable(sk)) | |
8d8ad9d7 | 1935 | sk_wake_async(sk, SOCK_WAKE_SPACE, POLL_OUT); |
1da177e4 LT |
1936 | } |
1937 | ||
43815482 | 1938 | rcu_read_unlock(); |
1da177e4 LT |
1939 | } |
1940 | ||
1941 | static void sock_def_destruct(struct sock *sk) | |
1942 | { | |
a51482bd | 1943 | kfree(sk->sk_protinfo); |
1da177e4 LT |
1944 | } |
1945 | ||
1946 | void sk_send_sigurg(struct sock *sk) | |
1947 | { | |
1948 | if (sk->sk_socket && sk->sk_socket->file) | |
1949 | if (send_sigurg(&sk->sk_socket->file->f_owner)) | |
8d8ad9d7 | 1950 | sk_wake_async(sk, SOCK_WAKE_URG, POLL_PRI); |
1da177e4 | 1951 | } |
2a91525c | 1952 | EXPORT_SYMBOL(sk_send_sigurg); |
1da177e4 LT |
1953 | |
1954 | void sk_reset_timer(struct sock *sk, struct timer_list* timer, | |
1955 | unsigned long expires) | |
1956 | { | |
1957 | if (!mod_timer(timer, expires)) | |
1958 | sock_hold(sk); | |
1959 | } | |
1da177e4 LT |
1960 | EXPORT_SYMBOL(sk_reset_timer); |
1961 | ||
1962 | void sk_stop_timer(struct sock *sk, struct timer_list* timer) | |
1963 | { | |
1964 | if (timer_pending(timer) && del_timer(timer)) | |
1965 | __sock_put(sk); | |
1966 | } | |
1da177e4 LT |
1967 | EXPORT_SYMBOL(sk_stop_timer); |
1968 | ||
1969 | void sock_init_data(struct socket *sock, struct sock *sk) | |
1970 | { | |
1971 | skb_queue_head_init(&sk->sk_receive_queue); | |
1972 | skb_queue_head_init(&sk->sk_write_queue); | |
1973 | skb_queue_head_init(&sk->sk_error_queue); | |
97fc2f08 CL |
1974 | #ifdef CONFIG_NET_DMA |
1975 | skb_queue_head_init(&sk->sk_async_wait_queue); | |
1976 | #endif | |
1da177e4 LT |
1977 | |
1978 | sk->sk_send_head = NULL; | |
1979 | ||
1980 | init_timer(&sk->sk_timer); | |
4ec93edb | 1981 | |
1da177e4 LT |
1982 | sk->sk_allocation = GFP_KERNEL; |
1983 | sk->sk_rcvbuf = sysctl_rmem_default; | |
1984 | sk->sk_sndbuf = sysctl_wmem_default; | |
1985 | sk->sk_state = TCP_CLOSE; | |
972692e0 | 1986 | sk_set_socket(sk, sock); |
1da177e4 LT |
1987 | |
1988 | sock_set_flag(sk, SOCK_ZAPPED); | |
1989 | ||
e71a4783 | 1990 | if (sock) { |
1da177e4 | 1991 | sk->sk_type = sock->type; |
43815482 | 1992 | sk->sk_wq = sock->wq; |
1da177e4 LT |
1993 | sock->sk = sk; |
1994 | } else | |
43815482 | 1995 | sk->sk_wq = NULL; |
1da177e4 | 1996 | |
b6c6712a | 1997 | spin_lock_init(&sk->sk_dst_lock); |
1da177e4 | 1998 | rwlock_init(&sk->sk_callback_lock); |
443aef0e PZ |
1999 | lockdep_set_class_and_name(&sk->sk_callback_lock, |
2000 | af_callback_keys + sk->sk_family, | |
2001 | af_family_clock_key_strings[sk->sk_family]); | |
1da177e4 LT |
2002 | |
2003 | sk->sk_state_change = sock_def_wakeup; | |
2004 | sk->sk_data_ready = sock_def_readable; | |
2005 | sk->sk_write_space = sock_def_write_space; | |
2006 | sk->sk_error_report = sock_def_error_report; | |
2007 | sk->sk_destruct = sock_def_destruct; | |
2008 | ||
2009 | sk->sk_sndmsg_page = NULL; | |
2010 | sk->sk_sndmsg_off = 0; | |
2011 | ||
109f6e39 EB |
2012 | sk->sk_peer_pid = NULL; |
2013 | sk->sk_peer_cred = NULL; | |
1da177e4 LT |
2014 | sk->sk_write_pending = 0; |
2015 | sk->sk_rcvlowat = 1; | |
2016 | sk->sk_rcvtimeo = MAX_SCHEDULE_TIMEOUT; | |
2017 | sk->sk_sndtimeo = MAX_SCHEDULE_TIMEOUT; | |
2018 | ||
f37f0afb | 2019 | sk->sk_stamp = ktime_set(-1L, 0); |
1da177e4 | 2020 | |
4dc6dc71 ED |
2021 | /* |
2022 | * Before updating sk_refcnt, we must commit prior changes to memory | |
2023 | * (Documentation/RCU/rculist_nulls.txt for details) | |
2024 | */ | |
2025 | smp_wmb(); | |
1da177e4 | 2026 | atomic_set(&sk->sk_refcnt, 1); |
33c732c3 | 2027 | atomic_set(&sk->sk_drops, 0); |
1da177e4 | 2028 | } |
2a91525c | 2029 | EXPORT_SYMBOL(sock_init_data); |
1da177e4 | 2030 | |
b5606c2d | 2031 | void lock_sock_nested(struct sock *sk, int subclass) |
1da177e4 LT |
2032 | { |
2033 | might_sleep(); | |
a5b5bb9a | 2034 | spin_lock_bh(&sk->sk_lock.slock); |
d2e9117c | 2035 | if (sk->sk_lock.owned) |
1da177e4 | 2036 | __lock_sock(sk); |
d2e9117c | 2037 | sk->sk_lock.owned = 1; |
a5b5bb9a IM |
2038 | spin_unlock(&sk->sk_lock.slock); |
2039 | /* | |
2040 | * The sk_lock has mutex_lock() semantics here: | |
2041 | */ | |
fcc70d5f | 2042 | mutex_acquire(&sk->sk_lock.dep_map, subclass, 0, _RET_IP_); |
a5b5bb9a | 2043 | local_bh_enable(); |
1da177e4 | 2044 | } |
fcc70d5f | 2045 | EXPORT_SYMBOL(lock_sock_nested); |
1da177e4 | 2046 | |
b5606c2d | 2047 | void release_sock(struct sock *sk) |
1da177e4 | 2048 | { |
a5b5bb9a IM |
2049 | /* |
2050 | * The sk_lock has mutex_unlock() semantics: | |
2051 | */ | |
2052 | mutex_release(&sk->sk_lock.dep_map, 1, _RET_IP_); | |
2053 | ||
2054 | spin_lock_bh(&sk->sk_lock.slock); | |
1da177e4 LT |
2055 | if (sk->sk_backlog.tail) |
2056 | __release_sock(sk); | |
d2e9117c | 2057 | sk->sk_lock.owned = 0; |
a5b5bb9a IM |
2058 | if (waitqueue_active(&sk->sk_lock.wq)) |
2059 | wake_up(&sk->sk_lock.wq); | |
2060 | spin_unlock_bh(&sk->sk_lock.slock); | |
1da177e4 LT |
2061 | } |
2062 | EXPORT_SYMBOL(release_sock); | |
2063 | ||
8a74ad60 ED |
2064 | /** |
2065 | * lock_sock_fast - fast version of lock_sock | |
2066 | * @sk: socket | |
2067 | * | |
2068 | * This version should be used for very small section, where process wont block | |
2069 | * return false if fast path is taken | |
2070 | * sk_lock.slock locked, owned = 0, BH disabled | |
2071 | * return true if slow path is taken | |
2072 | * sk_lock.slock unlocked, owned = 1, BH enabled | |
2073 | */ | |
2074 | bool lock_sock_fast(struct sock *sk) | |
2075 | { | |
2076 | might_sleep(); | |
2077 | spin_lock_bh(&sk->sk_lock.slock); | |
2078 | ||
2079 | if (!sk->sk_lock.owned) | |
2080 | /* | |
2081 | * Note : We must disable BH | |
2082 | */ | |
2083 | return false; | |
2084 | ||
2085 | __lock_sock(sk); | |
2086 | sk->sk_lock.owned = 1; | |
2087 | spin_unlock(&sk->sk_lock.slock); | |
2088 | /* | |
2089 | * The sk_lock has mutex_lock() semantics here: | |
2090 | */ | |
2091 | mutex_acquire(&sk->sk_lock.dep_map, 0, 0, _RET_IP_); | |
2092 | local_bh_enable(); | |
2093 | return true; | |
2094 | } | |
2095 | EXPORT_SYMBOL(lock_sock_fast); | |
2096 | ||
1da177e4 | 2097 | int sock_get_timestamp(struct sock *sk, struct timeval __user *userstamp) |
4ec93edb | 2098 | { |
b7aa0bf7 | 2099 | struct timeval tv; |
1da177e4 | 2100 | if (!sock_flag(sk, SOCK_TIMESTAMP)) |
20d49473 | 2101 | sock_enable_timestamp(sk, SOCK_TIMESTAMP); |
b7aa0bf7 ED |
2102 | tv = ktime_to_timeval(sk->sk_stamp); |
2103 | if (tv.tv_sec == -1) | |
1da177e4 | 2104 | return -ENOENT; |
b7aa0bf7 ED |
2105 | if (tv.tv_sec == 0) { |
2106 | sk->sk_stamp = ktime_get_real(); | |
2107 | tv = ktime_to_timeval(sk->sk_stamp); | |
2108 | } | |
2109 | return copy_to_user(userstamp, &tv, sizeof(tv)) ? -EFAULT : 0; | |
4ec93edb | 2110 | } |
1da177e4 LT |
2111 | EXPORT_SYMBOL(sock_get_timestamp); |
2112 | ||
ae40eb1e ED |
2113 | int sock_get_timestampns(struct sock *sk, struct timespec __user *userstamp) |
2114 | { | |
2115 | struct timespec ts; | |
2116 | if (!sock_flag(sk, SOCK_TIMESTAMP)) | |
20d49473 | 2117 | sock_enable_timestamp(sk, SOCK_TIMESTAMP); |
ae40eb1e ED |
2118 | ts = ktime_to_timespec(sk->sk_stamp); |
2119 | if (ts.tv_sec == -1) | |
2120 | return -ENOENT; | |
2121 | if (ts.tv_sec == 0) { | |
2122 | sk->sk_stamp = ktime_get_real(); | |
2123 | ts = ktime_to_timespec(sk->sk_stamp); | |
2124 | } | |
2125 | return copy_to_user(userstamp, &ts, sizeof(ts)) ? -EFAULT : 0; | |
2126 | } | |
2127 | EXPORT_SYMBOL(sock_get_timestampns); | |
2128 | ||
20d49473 | 2129 | void sock_enable_timestamp(struct sock *sk, int flag) |
4ec93edb | 2130 | { |
20d49473 PO |
2131 | if (!sock_flag(sk, flag)) { |
2132 | sock_set_flag(sk, flag); | |
2133 | /* | |
2134 | * we just set one of the two flags which require net | |
2135 | * time stamping, but time stamping might have been on | |
2136 | * already because of the other one | |
2137 | */ | |
2138 | if (!sock_flag(sk, | |
2139 | flag == SOCK_TIMESTAMP ? | |
2140 | SOCK_TIMESTAMPING_RX_SOFTWARE : | |
2141 | SOCK_TIMESTAMP)) | |
2142 | net_enable_timestamp(); | |
1da177e4 LT |
2143 | } |
2144 | } | |
1da177e4 LT |
2145 | |
2146 | /* | |
2147 | * Get a socket option on an socket. | |
2148 | * | |
2149 | * FIX: POSIX 1003.1g is very ambiguous here. It states that | |
2150 | * asynchronous errors should be reported by getsockopt. We assume | |
2151 | * this means if you specify SO_ERROR (otherwise whats the point of it). | |
2152 | */ | |
2153 | int sock_common_getsockopt(struct socket *sock, int level, int optname, | |
2154 | char __user *optval, int __user *optlen) | |
2155 | { | |
2156 | struct sock *sk = sock->sk; | |
2157 | ||
2158 | return sk->sk_prot->getsockopt(sk, level, optname, optval, optlen); | |
2159 | } | |
1da177e4 LT |
2160 | EXPORT_SYMBOL(sock_common_getsockopt); |
2161 | ||
3fdadf7d | 2162 | #ifdef CONFIG_COMPAT |
543d9cfe ACM |
2163 | int compat_sock_common_getsockopt(struct socket *sock, int level, int optname, |
2164 | char __user *optval, int __user *optlen) | |
3fdadf7d DM |
2165 | { |
2166 | struct sock *sk = sock->sk; | |
2167 | ||
1e51f951 | 2168 | if (sk->sk_prot->compat_getsockopt != NULL) |
543d9cfe ACM |
2169 | return sk->sk_prot->compat_getsockopt(sk, level, optname, |
2170 | optval, optlen); | |
3fdadf7d DM |
2171 | return sk->sk_prot->getsockopt(sk, level, optname, optval, optlen); |
2172 | } | |
2173 | EXPORT_SYMBOL(compat_sock_common_getsockopt); | |
2174 | #endif | |
2175 | ||
1da177e4 LT |
2176 | int sock_common_recvmsg(struct kiocb *iocb, struct socket *sock, |
2177 | struct msghdr *msg, size_t size, int flags) | |
2178 | { | |
2179 | struct sock *sk = sock->sk; | |
2180 | int addr_len = 0; | |
2181 | int err; | |
2182 | ||
2183 | err = sk->sk_prot->recvmsg(iocb, sk, msg, size, flags & MSG_DONTWAIT, | |
2184 | flags & ~MSG_DONTWAIT, &addr_len); | |
2185 | if (err >= 0) | |
2186 | msg->msg_namelen = addr_len; | |
2187 | return err; | |
2188 | } | |
1da177e4 LT |
2189 | EXPORT_SYMBOL(sock_common_recvmsg); |
2190 | ||
2191 | /* | |
2192 | * Set socket options on an inet socket. | |
2193 | */ | |
2194 | int sock_common_setsockopt(struct socket *sock, int level, int optname, | |
b7058842 | 2195 | char __user *optval, unsigned int optlen) |
1da177e4 LT |
2196 | { |
2197 | struct sock *sk = sock->sk; | |
2198 | ||
2199 | return sk->sk_prot->setsockopt(sk, level, optname, optval, optlen); | |
2200 | } | |
1da177e4 LT |
2201 | EXPORT_SYMBOL(sock_common_setsockopt); |
2202 | ||
3fdadf7d | 2203 | #ifdef CONFIG_COMPAT |
543d9cfe | 2204 | int compat_sock_common_setsockopt(struct socket *sock, int level, int optname, |
b7058842 | 2205 | char __user *optval, unsigned int optlen) |
3fdadf7d DM |
2206 | { |
2207 | struct sock *sk = sock->sk; | |
2208 | ||
543d9cfe ACM |
2209 | if (sk->sk_prot->compat_setsockopt != NULL) |
2210 | return sk->sk_prot->compat_setsockopt(sk, level, optname, | |
2211 | optval, optlen); | |
3fdadf7d DM |
2212 | return sk->sk_prot->setsockopt(sk, level, optname, optval, optlen); |
2213 | } | |
2214 | EXPORT_SYMBOL(compat_sock_common_setsockopt); | |
2215 | #endif | |
2216 | ||
1da177e4 LT |
2217 | void sk_common_release(struct sock *sk) |
2218 | { | |
2219 | if (sk->sk_prot->destroy) | |
2220 | sk->sk_prot->destroy(sk); | |
2221 | ||
2222 | /* | |
2223 | * Observation: when sock_common_release is called, processes have | |
2224 | * no access to socket. But net still has. | |
2225 | * Step one, detach it from networking: | |
2226 | * | |
2227 | * A. Remove from hash tables. | |
2228 | */ | |
2229 | ||
2230 | sk->sk_prot->unhash(sk); | |
2231 | ||
2232 | /* | |
2233 | * In this point socket cannot receive new packets, but it is possible | |
2234 | * that some packets are in flight because some CPU runs receiver and | |
2235 | * did hash table lookup before we unhashed socket. They will achieve | |
2236 | * receive queue and will be purged by socket destructor. | |
2237 | * | |
2238 | * Also we still have packets pending on receive queue and probably, | |
2239 | * our own packets waiting in device queues. sock_destroy will drain | |
2240 | * receive queue, but transmitted packets will delay socket destruction | |
2241 | * until the last reference will be released. | |
2242 | */ | |
2243 | ||
2244 | sock_orphan(sk); | |
2245 | ||
2246 | xfrm_sk_free_policy(sk); | |
2247 | ||
e6848976 | 2248 | sk_refcnt_debug_release(sk); |
1da177e4 LT |
2249 | sock_put(sk); |
2250 | } | |
1da177e4 LT |
2251 | EXPORT_SYMBOL(sk_common_release); |
2252 | ||
2253 | static DEFINE_RWLOCK(proto_list_lock); | |
2254 | static LIST_HEAD(proto_list); | |
2255 | ||
13ff3d6f PE |
2256 | #ifdef CONFIG_PROC_FS |
2257 | #define PROTO_INUSE_NR 64 /* should be enough for the first time */ | |
1338d466 PE |
2258 | struct prot_inuse { |
2259 | int val[PROTO_INUSE_NR]; | |
2260 | }; | |
13ff3d6f PE |
2261 | |
2262 | static DECLARE_BITMAP(proto_inuse_idx, PROTO_INUSE_NR); | |
70ee1159 PE |
2263 | |
2264 | #ifdef CONFIG_NET_NS | |
2265 | void sock_prot_inuse_add(struct net *net, struct proto *prot, int val) | |
2266 | { | |
d6d9ca0f | 2267 | __this_cpu_add(net->core.inuse->val[prot->inuse_idx], val); |
70ee1159 PE |
2268 | } |
2269 | EXPORT_SYMBOL_GPL(sock_prot_inuse_add); | |
2270 | ||
2271 | int sock_prot_inuse_get(struct net *net, struct proto *prot) | |
2272 | { | |
2273 | int cpu, idx = prot->inuse_idx; | |
2274 | int res = 0; | |
2275 | ||
2276 | for_each_possible_cpu(cpu) | |
2277 | res += per_cpu_ptr(net->core.inuse, cpu)->val[idx]; | |
2278 | ||
2279 | return res >= 0 ? res : 0; | |
2280 | } | |
2281 | EXPORT_SYMBOL_GPL(sock_prot_inuse_get); | |
2282 | ||
2c8c1e72 | 2283 | static int __net_init sock_inuse_init_net(struct net *net) |
70ee1159 PE |
2284 | { |
2285 | net->core.inuse = alloc_percpu(struct prot_inuse); | |
2286 | return net->core.inuse ? 0 : -ENOMEM; | |
2287 | } | |
2288 | ||
2c8c1e72 | 2289 | static void __net_exit sock_inuse_exit_net(struct net *net) |
70ee1159 PE |
2290 | { |
2291 | free_percpu(net->core.inuse); | |
2292 | } | |
2293 | ||
2294 | static struct pernet_operations net_inuse_ops = { | |
2295 | .init = sock_inuse_init_net, | |
2296 | .exit = sock_inuse_exit_net, | |
2297 | }; | |
2298 | ||
2299 | static __init int net_inuse_init(void) | |
2300 | { | |
2301 | if (register_pernet_subsys(&net_inuse_ops)) | |
2302 | panic("Cannot initialize net inuse counters"); | |
2303 | ||
2304 | return 0; | |
2305 | } | |
2306 | ||
2307 | core_initcall(net_inuse_init); | |
2308 | #else | |
1338d466 PE |
2309 | static DEFINE_PER_CPU(struct prot_inuse, prot_inuse); |
2310 | ||
c29a0bc4 | 2311 | void sock_prot_inuse_add(struct net *net, struct proto *prot, int val) |
1338d466 | 2312 | { |
d6d9ca0f | 2313 | __this_cpu_add(prot_inuse.val[prot->inuse_idx], val); |
1338d466 PE |
2314 | } |
2315 | EXPORT_SYMBOL_GPL(sock_prot_inuse_add); | |
2316 | ||
c29a0bc4 | 2317 | int sock_prot_inuse_get(struct net *net, struct proto *prot) |
1338d466 PE |
2318 | { |
2319 | int cpu, idx = prot->inuse_idx; | |
2320 | int res = 0; | |
2321 | ||
2322 | for_each_possible_cpu(cpu) | |
2323 | res += per_cpu(prot_inuse, cpu).val[idx]; | |
2324 | ||
2325 | return res >= 0 ? res : 0; | |
2326 | } | |
2327 | EXPORT_SYMBOL_GPL(sock_prot_inuse_get); | |
70ee1159 | 2328 | #endif |
13ff3d6f PE |
2329 | |
2330 | static void assign_proto_idx(struct proto *prot) | |
2331 | { | |
2332 | prot->inuse_idx = find_first_zero_bit(proto_inuse_idx, PROTO_INUSE_NR); | |
2333 | ||
2334 | if (unlikely(prot->inuse_idx == PROTO_INUSE_NR - 1)) { | |
2335 | printk(KERN_ERR "PROTO_INUSE_NR exhausted\n"); | |
2336 | return; | |
2337 | } | |
2338 | ||
2339 | set_bit(prot->inuse_idx, proto_inuse_idx); | |
2340 | } | |
2341 | ||
2342 | static void release_proto_idx(struct proto *prot) | |
2343 | { | |
2344 | if (prot->inuse_idx != PROTO_INUSE_NR - 1) | |
2345 | clear_bit(prot->inuse_idx, proto_inuse_idx); | |
2346 | } | |
2347 | #else | |
2348 | static inline void assign_proto_idx(struct proto *prot) | |
2349 | { | |
2350 | } | |
2351 | ||
2352 | static inline void release_proto_idx(struct proto *prot) | |
2353 | { | |
2354 | } | |
2355 | #endif | |
2356 | ||
b733c007 PE |
2357 | int proto_register(struct proto *prot, int alloc_slab) |
2358 | { | |
1da177e4 LT |
2359 | if (alloc_slab) { |
2360 | prot->slab = kmem_cache_create(prot->name, prot->obj_size, 0, | |
271b72c7 ED |
2361 | SLAB_HWCACHE_ALIGN | prot->slab_flags, |
2362 | NULL); | |
1da177e4 LT |
2363 | |
2364 | if (prot->slab == NULL) { | |
2365 | printk(KERN_CRIT "%s: Can't create sock SLAB cache!\n", | |
2366 | prot->name); | |
60e7663d | 2367 | goto out; |
1da177e4 | 2368 | } |
2e6599cb ACM |
2369 | |
2370 | if (prot->rsk_prot != NULL) { | |
faf23422 | 2371 | prot->rsk_prot->slab_name = kasprintf(GFP_KERNEL, "request_sock_%s", prot->name); |
7e56b5d6 | 2372 | if (prot->rsk_prot->slab_name == NULL) |
2e6599cb ACM |
2373 | goto out_free_sock_slab; |
2374 | ||
7e56b5d6 | 2375 | prot->rsk_prot->slab = kmem_cache_create(prot->rsk_prot->slab_name, |
2e6599cb | 2376 | prot->rsk_prot->obj_size, 0, |
20c2df83 | 2377 | SLAB_HWCACHE_ALIGN, NULL); |
2e6599cb ACM |
2378 | |
2379 | if (prot->rsk_prot->slab == NULL) { | |
2380 | printk(KERN_CRIT "%s: Can't create request sock SLAB cache!\n", | |
2381 | prot->name); | |
2382 | goto out_free_request_sock_slab_name; | |
2383 | } | |
2384 | } | |
8feaf0c0 | 2385 | |
6d6ee43e | 2386 | if (prot->twsk_prot != NULL) { |
faf23422 | 2387 | prot->twsk_prot->twsk_slab_name = kasprintf(GFP_KERNEL, "tw_sock_%s", prot->name); |
8feaf0c0 | 2388 | |
7e56b5d6 | 2389 | if (prot->twsk_prot->twsk_slab_name == NULL) |
8feaf0c0 ACM |
2390 | goto out_free_request_sock_slab; |
2391 | ||
6d6ee43e | 2392 | prot->twsk_prot->twsk_slab = |
7e56b5d6 | 2393 | kmem_cache_create(prot->twsk_prot->twsk_slab_name, |
6d6ee43e | 2394 | prot->twsk_prot->twsk_obj_size, |
3ab5aee7 ED |
2395 | 0, |
2396 | SLAB_HWCACHE_ALIGN | | |
2397 | prot->slab_flags, | |
20c2df83 | 2398 | NULL); |
6d6ee43e | 2399 | if (prot->twsk_prot->twsk_slab == NULL) |
8feaf0c0 ACM |
2400 | goto out_free_timewait_sock_slab_name; |
2401 | } | |
1da177e4 LT |
2402 | } |
2403 | ||
2a278051 | 2404 | write_lock(&proto_list_lock); |
1da177e4 | 2405 | list_add(&prot->node, &proto_list); |
13ff3d6f | 2406 | assign_proto_idx(prot); |
1da177e4 | 2407 | write_unlock(&proto_list_lock); |
b733c007 PE |
2408 | return 0; |
2409 | ||
8feaf0c0 | 2410 | out_free_timewait_sock_slab_name: |
7e56b5d6 | 2411 | kfree(prot->twsk_prot->twsk_slab_name); |
8feaf0c0 ACM |
2412 | out_free_request_sock_slab: |
2413 | if (prot->rsk_prot && prot->rsk_prot->slab) { | |
2414 | kmem_cache_destroy(prot->rsk_prot->slab); | |
2415 | prot->rsk_prot->slab = NULL; | |
2416 | } | |
2e6599cb | 2417 | out_free_request_sock_slab_name: |
72150e9b DC |
2418 | if (prot->rsk_prot) |
2419 | kfree(prot->rsk_prot->slab_name); | |
2e6599cb ACM |
2420 | out_free_sock_slab: |
2421 | kmem_cache_destroy(prot->slab); | |
2422 | prot->slab = NULL; | |
b733c007 PE |
2423 | out: |
2424 | return -ENOBUFS; | |
1da177e4 | 2425 | } |
1da177e4 LT |
2426 | EXPORT_SYMBOL(proto_register); |
2427 | ||
2428 | void proto_unregister(struct proto *prot) | |
2429 | { | |
2430 | write_lock(&proto_list_lock); | |
13ff3d6f | 2431 | release_proto_idx(prot); |
0a3f4358 PM |
2432 | list_del(&prot->node); |
2433 | write_unlock(&proto_list_lock); | |
1da177e4 LT |
2434 | |
2435 | if (prot->slab != NULL) { | |
2436 | kmem_cache_destroy(prot->slab); | |
2437 | prot->slab = NULL; | |
2438 | } | |
2439 | ||
2e6599cb | 2440 | if (prot->rsk_prot != NULL && prot->rsk_prot->slab != NULL) { |
2e6599cb | 2441 | kmem_cache_destroy(prot->rsk_prot->slab); |
7e56b5d6 | 2442 | kfree(prot->rsk_prot->slab_name); |
2e6599cb ACM |
2443 | prot->rsk_prot->slab = NULL; |
2444 | } | |
2445 | ||
6d6ee43e | 2446 | if (prot->twsk_prot != NULL && prot->twsk_prot->twsk_slab != NULL) { |
6d6ee43e | 2447 | kmem_cache_destroy(prot->twsk_prot->twsk_slab); |
7e56b5d6 | 2448 | kfree(prot->twsk_prot->twsk_slab_name); |
6d6ee43e | 2449 | prot->twsk_prot->twsk_slab = NULL; |
8feaf0c0 | 2450 | } |
1da177e4 | 2451 | } |
1da177e4 LT |
2452 | EXPORT_SYMBOL(proto_unregister); |
2453 | ||
2454 | #ifdef CONFIG_PROC_FS | |
1da177e4 | 2455 | static void *proto_seq_start(struct seq_file *seq, loff_t *pos) |
9a429c49 | 2456 | __acquires(proto_list_lock) |
1da177e4 LT |
2457 | { |
2458 | read_lock(&proto_list_lock); | |
60f0438a | 2459 | return seq_list_start_head(&proto_list, *pos); |
1da177e4 LT |
2460 | } |
2461 | ||
2462 | static void *proto_seq_next(struct seq_file *seq, void *v, loff_t *pos) | |
2463 | { | |
60f0438a | 2464 | return seq_list_next(v, &proto_list, pos); |
1da177e4 LT |
2465 | } |
2466 | ||
2467 | static void proto_seq_stop(struct seq_file *seq, void *v) | |
9a429c49 | 2468 | __releases(proto_list_lock) |
1da177e4 LT |
2469 | { |
2470 | read_unlock(&proto_list_lock); | |
2471 | } | |
2472 | ||
2473 | static char proto_method_implemented(const void *method) | |
2474 | { | |
2475 | return method == NULL ? 'n' : 'y'; | |
2476 | } | |
2477 | ||
2478 | static void proto_seq_printf(struct seq_file *seq, struct proto *proto) | |
2479 | { | |
8d987e5c | 2480 | seq_printf(seq, "%-9s %4u %6d %6ld %-3s %6u %-3s %-10s " |
1da177e4 LT |
2481 | "%2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c %2c\n", |
2482 | proto->name, | |
2483 | proto->obj_size, | |
14e943db | 2484 | sock_prot_inuse_get(seq_file_net(seq), proto), |
8d987e5c | 2485 | proto->memory_allocated != NULL ? atomic_long_read(proto->memory_allocated) : -1L, |
1da177e4 LT |
2486 | proto->memory_pressure != NULL ? *proto->memory_pressure ? "yes" : "no" : "NI", |
2487 | proto->max_header, | |
2488 | proto->slab == NULL ? "no" : "yes", | |
2489 | module_name(proto->owner), | |
2490 | proto_method_implemented(proto->close), | |
2491 | proto_method_implemented(proto->connect), | |
2492 | proto_method_implemented(proto->disconnect), | |
2493 | proto_method_implemented(proto->accept), | |
2494 | proto_method_implemented(proto->ioctl), | |
2495 | proto_method_implemented(proto->init), | |
2496 | proto_method_implemented(proto->destroy), | |
2497 | proto_method_implemented(proto->shutdown), | |
2498 | proto_method_implemented(proto->setsockopt), | |
2499 | proto_method_implemented(proto->getsockopt), | |
2500 | proto_method_implemented(proto->sendmsg), | |
2501 | proto_method_implemented(proto->recvmsg), | |
2502 | proto_method_implemented(proto->sendpage), | |
2503 | proto_method_implemented(proto->bind), | |
2504 | proto_method_implemented(proto->backlog_rcv), | |
2505 | proto_method_implemented(proto->hash), | |
2506 | proto_method_implemented(proto->unhash), | |
2507 | proto_method_implemented(proto->get_port), | |
2508 | proto_method_implemented(proto->enter_memory_pressure)); | |
2509 | } | |
2510 | ||
2511 | static int proto_seq_show(struct seq_file *seq, void *v) | |
2512 | { | |
60f0438a | 2513 | if (v == &proto_list) |
1da177e4 LT |
2514 | seq_printf(seq, "%-9s %-4s %-8s %-6s %-5s %-7s %-4s %-10s %s", |
2515 | "protocol", | |
2516 | "size", | |
2517 | "sockets", | |
2518 | "memory", | |
2519 | "press", | |
2520 | "maxhdr", | |
2521 | "slab", | |
2522 | "module", | |
2523 | "cl co di ac io in de sh ss gs se re sp bi br ha uh gp em\n"); | |
2524 | else | |
60f0438a | 2525 | proto_seq_printf(seq, list_entry(v, struct proto, node)); |
1da177e4 LT |
2526 | return 0; |
2527 | } | |
2528 | ||
f690808e | 2529 | static const struct seq_operations proto_seq_ops = { |
1da177e4 LT |
2530 | .start = proto_seq_start, |
2531 | .next = proto_seq_next, | |
2532 | .stop = proto_seq_stop, | |
2533 | .show = proto_seq_show, | |
2534 | }; | |
2535 | ||
2536 | static int proto_seq_open(struct inode *inode, struct file *file) | |
2537 | { | |
14e943db ED |
2538 | return seq_open_net(inode, file, &proto_seq_ops, |
2539 | sizeof(struct seq_net_private)); | |
1da177e4 LT |
2540 | } |
2541 | ||
9a32144e | 2542 | static const struct file_operations proto_seq_fops = { |
1da177e4 LT |
2543 | .owner = THIS_MODULE, |
2544 | .open = proto_seq_open, | |
2545 | .read = seq_read, | |
2546 | .llseek = seq_lseek, | |
14e943db ED |
2547 | .release = seq_release_net, |
2548 | }; | |
2549 | ||
2550 | static __net_init int proto_init_net(struct net *net) | |
2551 | { | |
2552 | if (!proc_net_fops_create(net, "protocols", S_IRUGO, &proto_seq_fops)) | |
2553 | return -ENOMEM; | |
2554 | ||
2555 | return 0; | |
2556 | } | |
2557 | ||
2558 | static __net_exit void proto_exit_net(struct net *net) | |
2559 | { | |
2560 | proc_net_remove(net, "protocols"); | |
2561 | } | |
2562 | ||
2563 | ||
2564 | static __net_initdata struct pernet_operations proto_net_ops = { | |
2565 | .init = proto_init_net, | |
2566 | .exit = proto_exit_net, | |
1da177e4 LT |
2567 | }; |
2568 | ||
2569 | static int __init proto_init(void) | |
2570 | { | |
14e943db | 2571 | return register_pernet_subsys(&proto_net_ops); |
1da177e4 LT |
2572 | } |
2573 | ||
2574 | subsys_initcall(proto_init); | |
2575 | ||
2576 | #endif /* PROC_FS */ |