blob: 41e65804ddf59651c78ae58b697e7e5e603c9167 [file] [log] [blame]
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -07001/*
2 * net/dccp/proto.c
3 *
4 * An implementation of the DCCP protocol
5 * Arnaldo Carvalho de Melo <acme@conectiva.com.br>
6 *
7 * This program is free software; you can redistribute it and/or modify it
8 * under the terms of the GNU General Public License version 2 as
9 * published by the Free Software Foundation.
10 */
11
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -070012#include <linux/dccp.h>
13#include <linux/module.h>
14#include <linux/types.h>
15#include <linux/sched.h>
16#include <linux/kernel.h>
17#include <linux/skbuff.h>
18#include <linux/netdevice.h>
19#include <linux/in.h>
20#include <linux/if_arp.h>
21#include <linux/init.h>
22#include <linux/random.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090023#include <linux/slab.h>
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -070024#include <net/checksum.h>
25
Arnaldo Carvalho de Melo14c85022005-12-27 02:43:12 -020026#include <net/inet_sock.h>
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -070027#include <net/sock.h>
28#include <net/xfrm.h>
29
Arnaldo Carvalho de Melo62731722007-10-23 20:23:30 -070030#include <asm/ioctls.h>
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -070031#include <linux/spinlock.h>
32#include <linux/timer.h>
33#include <linux/delay.h>
34#include <linux/poll.h>
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -070035
36#include "ccid.h"
37#include "dccp.h"
Andrea Bittauafe00252006-03-20 17:43:56 -080038#include "feat.h"
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -070039
Eric Dumazetba899662005-08-26 12:05:31 -070040DEFINE_SNMP_STAT(struct dccp_mib, dccp_statistics) __read_mostly;
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -070041
Arnaldo Carvalho de Melof21e68c2005-12-13 23:24:16 -080042EXPORT_SYMBOL_GPL(dccp_statistics);
43
Eric Dumazetdd24c002008-11-25 21:17:14 -080044struct percpu_counter dccp_orphan_count;
Arnaldo Carvalho de Melof21e68c2005-12-13 23:24:16 -080045EXPORT_SYMBOL_GPL(dccp_orphan_count);
46
Eric Dumazet5caea4e2008-11-20 00:40:07 -080047struct inet_hashinfo dccp_hashinfo;
Arnaldo Carvalho de Melo075ae862006-03-20 21:24:19 -080048EXPORT_SYMBOL_GPL(dccp_hashinfo);
49
Ian McDonaldb1308dc2006-11-20 18:30:17 -020050/* the maximum queue length for tx in packets. 0 is no limit */
51int sysctl_dccp_tx_qlen __read_mostly = 5;
52
stephen hemminger1f4f0f62010-10-05 04:24:09 +000053#ifdef CONFIG_IP_DCCP_DEBUG
54static const char *dccp_state_name(const int state)
55{
56 static const char *const dccp_state_names[] = {
57 [DCCP_OPEN] = "OPEN",
58 [DCCP_REQUESTING] = "REQUESTING",
59 [DCCP_PARTOPEN] = "PARTOPEN",
60 [DCCP_LISTEN] = "LISTEN",
61 [DCCP_RESPOND] = "RESPOND",
62 [DCCP_CLOSING] = "CLOSING",
63 [DCCP_ACTIVE_CLOSEREQ] = "CLOSEREQ",
64 [DCCP_PASSIVE_CLOSE] = "PASSIVE_CLOSE",
65 [DCCP_PASSIVE_CLOSEREQ] = "PASSIVE_CLOSEREQ",
66 [DCCP_TIME_WAIT] = "TIME_WAIT",
67 [DCCP_CLOSED] = "CLOSED",
68 };
69
70 if (state >= DCCP_MAX_STATES)
71 return "INVALID STATE!";
72 else
73 return dccp_state_names[state];
74}
75#endif
76
Arnaldo Carvalho de Meloc25a18b2006-03-20 21:58:56 -080077void dccp_set_state(struct sock *sk, const int state)
78{
79 const int oldstate = sk->sk_state;
80
Gerrit Renkerf11135a2007-11-28 11:34:53 -020081 dccp_pr_debug("%s(%p) %s --> %s\n", dccp_role(sk), sk,
Arnaldo Carvalho de Meloc25a18b2006-03-20 21:58:56 -080082 dccp_state_name(oldstate), dccp_state_name(state));
83 WARN_ON(state == oldstate);
84
85 switch (state) {
86 case DCCP_OPEN:
87 if (oldstate != DCCP_OPEN)
88 DCCP_INC_STATS(DCCP_MIB_CURRESTAB);
Gerrit Renker6eb55d12008-12-08 01:15:26 -080089 /* Client retransmits all Confirm options until entering OPEN */
90 if (oldstate == DCCP_PARTOPEN)
91 dccp_feat_list_purge(&dccp_sk(sk)->dccps_featneg);
Arnaldo Carvalho de Meloc25a18b2006-03-20 21:58:56 -080092 break;
93
94 case DCCP_CLOSED:
Gerrit Renker0c869622007-11-28 11:59:48 -020095 if (oldstate == DCCP_OPEN || oldstate == DCCP_ACTIVE_CLOSEREQ ||
96 oldstate == DCCP_CLOSING)
Arnaldo Carvalho de Meloc25a18b2006-03-20 21:58:56 -080097 DCCP_INC_STATS(DCCP_MIB_ESTABRESETS);
98
99 sk->sk_prot->unhash(sk);
100 if (inet_csk(sk)->icsk_bind_hash != NULL &&
101 !(sk->sk_userlocks & SOCK_BINDPORT_LOCK))
Arnaldo Carvalho de Meloab1e0a12008-02-03 04:06:04 -0800102 inet_put_port(sk);
Arnaldo Carvalho de Meloc25a18b2006-03-20 21:58:56 -0800103 /* fall through */
104 default:
105 if (oldstate == DCCP_OPEN)
106 DCCP_DEC_STATS(DCCP_MIB_CURRESTAB);
107 }
108
109 /* Change state AFTER socket is unhashed to avoid closed
110 * socket sitting in hash tables.
111 */
112 sk->sk_state = state;
113}
114
115EXPORT_SYMBOL_GPL(dccp_set_state);
116
Gerrit Renker0c869622007-11-28 11:59:48 -0200117static void dccp_finish_passive_close(struct sock *sk)
118{
119 switch (sk->sk_state) {
120 case DCCP_PASSIVE_CLOSE:
121 /* Node (client or server) has received Close packet. */
122 dccp_send_reset(sk, DCCP_RESET_CODE_CLOSED);
123 dccp_set_state(sk, DCCP_CLOSED);
124 break;
125 case DCCP_PASSIVE_CLOSEREQ:
126 /*
127 * Client received CloseReq. We set the `active' flag so that
128 * dccp_send_close() retransmits the Close as per RFC 4340, 8.3.
129 */
130 dccp_send_close(sk, 1);
131 dccp_set_state(sk, DCCP_CLOSING);
132 }
133}
134
Arnaldo Carvalho de Meloc25a18b2006-03-20 21:58:56 -0800135void dccp_done(struct sock *sk)
136{
137 dccp_set_state(sk, DCCP_CLOSED);
138 dccp_clear_xmit_timers(sk);
139
140 sk->sk_shutdown = SHUTDOWN_MASK;
141
142 if (!sock_flag(sk, SOCK_DEAD))
143 sk->sk_state_change(sk);
144 else
145 inet_csk_destroy_sock(sk);
146}
147
148EXPORT_SYMBOL_GPL(dccp_done);
149
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700150const char *dccp_packet_name(const int type)
151{
Jan Engelhardt36cbd3d2009-08-05 10:42:58 -0700152 static const char *const dccp_packet_names[] = {
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700153 [DCCP_PKT_REQUEST] = "REQUEST",
154 [DCCP_PKT_RESPONSE] = "RESPONSE",
155 [DCCP_PKT_DATA] = "DATA",
156 [DCCP_PKT_ACK] = "ACK",
157 [DCCP_PKT_DATAACK] = "DATAACK",
158 [DCCP_PKT_CLOSEREQ] = "CLOSEREQ",
159 [DCCP_PKT_CLOSE] = "CLOSE",
160 [DCCP_PKT_RESET] = "RESET",
161 [DCCP_PKT_SYNC] = "SYNC",
162 [DCCP_PKT_SYNCACK] = "SYNCACK",
163 };
164
165 if (type >= DCCP_NR_PKT_TYPES)
166 return "INVALID";
167 else
168 return dccp_packet_names[type];
169}
170
171EXPORT_SYMBOL_GPL(dccp_packet_name);
172
Arnaldo Carvalho de Melo72478872006-03-20 22:00:37 -0800173int dccp_init_sock(struct sock *sk, const __u8 ctl_sock_initialized)
Arnaldo Carvalho de Melo3e0fadc2006-03-20 21:23:15 -0800174{
175 struct dccp_sock *dp = dccp_sk(sk);
176 struct inet_connection_sock *icsk = inet_csk(sk);
Arnaldo Carvalho de Melo3e0fadc2006-03-20 21:23:15 -0800177
Arnaldo Carvalho de Meloe18d7a92007-11-24 21:42:53 -0200178 icsk->icsk_rto = DCCP_TIMEOUT_INIT;
179 icsk->icsk_syn_retries = sysctl_dccp_request_retries;
180 sk->sk_state = DCCP_CLOSED;
181 sk->sk_write_space = dccp_write_space;
182 icsk->icsk_sync_mss = dccp_sync_mss;
Gerrit Renker410e27a2008-09-09 13:27:22 +0200183 dp->dccps_mss_cache = 536;
Arnaldo Carvalho de Meloe18d7a92007-11-24 21:42:53 -0200184 dp->dccps_rate_last = jiffies;
185 dp->dccps_role = DCCP_ROLE_UNDEFINED;
186 dp->dccps_service = DCCP_SERVICE_CODE_IS_ABSENT;
Tomasz Grobelny871a2c12010-12-04 13:38:01 +0100187 dp->dccps_tx_qlen = sysctl_dccp_tx_qlen;
Arnaldo Carvalho de Meloe18d7a92007-11-24 21:42:53 -0200188
189 dccp_init_xmit_timers(sk);
190
Gerrit Renkerac757732008-11-04 23:55:49 -0800191 INIT_LIST_HEAD(&dp->dccps_featneg);
Gerrit Renker6eb55d12008-12-08 01:15:26 -0800192 /* control socket doesn't need feat nego */
193 if (likely(ctl_sock_initialized))
194 return dccp_feat_init(sk);
Arnaldo Carvalho de Melo3e0fadc2006-03-20 21:23:15 -0800195 return 0;
196}
197
198EXPORT_SYMBOL_GPL(dccp_init_sock);
199
Brian Haley7d06b2e2008-06-14 17:04:49 -0700200void dccp_destroy_sock(struct sock *sk)
Arnaldo Carvalho de Melo3e0fadc2006-03-20 21:23:15 -0800201{
202 struct dccp_sock *dp = dccp_sk(sk);
203
204 /*
205 * DCCP doesn't use sk_write_queue, just sk_send_head
206 * for retransmissions
207 */
208 if (sk->sk_send_head != NULL) {
209 kfree_skb(sk->sk_send_head);
210 sk->sk_send_head = NULL;
211 }
212
213 /* Clean up a referenced DCCP bind bucket. */
214 if (inet_csk(sk)->icsk_bind_hash != NULL)
Arnaldo Carvalho de Meloab1e0a12008-02-03 04:06:04 -0800215 inet_put_port(sk);
Arnaldo Carvalho de Melo3e0fadc2006-03-20 21:23:15 -0800216
217 kfree(dp->dccps_service_list);
218 dp->dccps_service_list = NULL;
219
Gerrit Renker6fdd34d2008-12-08 01:19:06 -0800220 if (dp->dccps_hc_rx_ackvec != NULL) {
Arnaldo Carvalho de Melo3e0fadc2006-03-20 21:23:15 -0800221 dccp_ackvec_free(dp->dccps_hc_rx_ackvec);
222 dp->dccps_hc_rx_ackvec = NULL;
223 }
224 ccid_hc_rx_delete(dp->dccps_hc_rx_ccid, sk);
225 ccid_hc_tx_delete(dp->dccps_hc_tx_ccid, sk);
226 dp->dccps_hc_rx_ccid = dp->dccps_hc_tx_ccid = NULL;
227
228 /* clean up feature negotiation state */
Gerrit Renkerd99a7bd2008-11-04 23:56:30 -0800229 dccp_feat_list_purge(&dp->dccps_featneg);
Arnaldo Carvalho de Melo3e0fadc2006-03-20 21:23:15 -0800230}
231
232EXPORT_SYMBOL_GPL(dccp_destroy_sock);
233
Eric Dumazet72a3eff2006-11-16 02:30:37 -0800234static inline int dccp_listen_start(struct sock *sk, int backlog)
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700235{
Arnaldo Carvalho de Melo67e6b622005-09-16 16:58:40 -0700236 struct dccp_sock *dp = dccp_sk(sk);
237
238 dp->dccps_role = DCCP_ROLE_LISTEN;
Gerrit Renker9eca0a42008-11-12 00:48:44 -0800239 /* do not start to listen if feature negotiation setup fails */
240 if (dccp_feat_finalise_settings(dp))
241 return -EPROTO;
Eric Dumazet72a3eff2006-11-16 02:30:37 -0800242 return inet_csk_listen_start(sk, backlog);
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700243}
244
Gerrit Renkerce865a62007-11-24 22:14:15 -0200245static inline int dccp_need_reset(int state)
246{
247 return state != DCCP_CLOSED && state != DCCP_LISTEN &&
248 state != DCCP_REQUESTING;
249}
250
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700251int dccp_disconnect(struct sock *sk, int flags)
252{
253 struct inet_connection_sock *icsk = inet_csk(sk);
254 struct inet_sock *inet = inet_sk(sk);
255 int err = 0;
256 const int old_state = sk->sk_state;
257
258 if (old_state != DCCP_CLOSED)
259 dccp_set_state(sk, DCCP_CLOSED);
260
Gerrit Renkerce865a62007-11-24 22:14:15 -0200261 /*
262 * This corresponds to the ABORT function of RFC793, sec. 3.8
263 * TCP uses a RST segment, DCCP a Reset packet with Code 2, "Aborted".
264 */
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700265 if (old_state == DCCP_LISTEN) {
266 inet_csk_listen_stop(sk);
Gerrit Renkerce865a62007-11-24 22:14:15 -0200267 } else if (dccp_need_reset(old_state)) {
268 dccp_send_reset(sk, DCCP_RESET_CODE_ABORTED);
269 sk->sk_err = ECONNRESET;
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700270 } else if (old_state == DCCP_REQUESTING)
271 sk->sk_err = ECONNRESET;
272
273 dccp_clear_xmit_timers(sk);
Gerrit Renker48816322008-08-23 13:28:27 +0200274
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700275 __skb_queue_purge(&sk->sk_receive_queue);
Gerrit Renker48816322008-08-23 13:28:27 +0200276 __skb_queue_purge(&sk->sk_write_queue);
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700277 if (sk->sk_send_head != NULL) {
278 __kfree_skb(sk->sk_send_head);
279 sk->sk_send_head = NULL;
280 }
281
Eric Dumazetc720c7e2009-10-15 06:30:45 +0000282 inet->inet_dport = 0;
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700283
284 if (!(sk->sk_userlocks & SOCK_BINDADDR_LOCK))
285 inet_reset_saddr(sk);
286
287 sk->sk_shutdown = 0;
288 sock_reset_flag(sk, SOCK_DONE);
289
290 icsk->icsk_backoff = 0;
291 inet_csk_delack_init(sk);
292 __sk_dst_reset(sk);
293
Eric Dumazetc720c7e2009-10-15 06:30:45 +0000294 WARN_ON(inet->inet_num && !icsk->icsk_bind_hash);
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700295
296 sk->sk_error_report(sk);
297 return err;
298}
299
Arnaldo Carvalho de Melof21e68c2005-12-13 23:24:16 -0800300EXPORT_SYMBOL_GPL(dccp_disconnect);
301
Arnaldo Carvalho de Melo331968b2005-08-23 21:54:23 -0700302/*
303 * Wait for a DCCP event.
304 *
305 * Note that we don't need to lock the socket, as the upper poll layers
306 * take care of normal races (between the test and the event) and we don't
307 * go look at any of the socket buffers directly.
308 */
Arnaldo Carvalho de Melof21e68c2005-12-13 23:24:16 -0800309unsigned int dccp_poll(struct file *file, struct socket *sock,
310 poll_table *wait)
Arnaldo Carvalho de Melo331968b2005-08-23 21:54:23 -0700311{
312 unsigned int mask;
313 struct sock *sk = sock->sk;
314
Eric Dumazetaa395142010-04-20 13:03:51 +0000315 sock_poll_wait(file, sk_sleep(sk), wait);
Arnaldo Carvalho de Melo331968b2005-08-23 21:54:23 -0700316 if (sk->sk_state == DCCP_LISTEN)
317 return inet_csk_listen_poll(sk);
318
319 /* Socket is not locked. We are protected from async events
320 by poll logic and correct handling of state changes
321 made by another threads is impossible in any case.
322 */
323
324 mask = 0;
325 if (sk->sk_err)
326 mask = POLLERR;
327
328 if (sk->sk_shutdown == SHUTDOWN_MASK || sk->sk_state == DCCP_CLOSED)
329 mask |= POLLHUP;
330 if (sk->sk_shutdown & RCV_SHUTDOWN)
Davide Libenzif348d702006-03-25 03:07:39 -0800331 mask |= POLLIN | POLLRDNORM | POLLRDHUP;
Arnaldo Carvalho de Melo331968b2005-08-23 21:54:23 -0700332
333 /* Connected? */
334 if ((1 << sk->sk_state) & ~(DCCPF_REQUESTING | DCCPF_RESPOND)) {
335 if (atomic_read(&sk->sk_rmem_alloc) > 0)
336 mask |= POLLIN | POLLRDNORM;
337
338 if (!(sk->sk_shutdown & SEND_SHUTDOWN)) {
Eric Dumazet64dc6132013-07-22 20:26:31 -0700339 if (sk_stream_is_writeable(sk)) {
Arnaldo Carvalho de Melo331968b2005-08-23 21:54:23 -0700340 mask |= POLLOUT | POLLWRNORM;
341 } else { /* send SIGIO later */
Eric Dumazet9cd3e072015-11-29 20:03:10 -0800342 sk_set_bit(SOCKWQ_ASYNC_NOSPACE, sk);
Arnaldo Carvalho de Melo331968b2005-08-23 21:54:23 -0700343 set_bit(SOCK_NOSPACE, &sk->sk_socket->flags);
344
345 /* Race breaker. If space is freed after
346 * wspace test but before the flags are set,
347 * IO signal will be lost.
348 */
Eric Dumazet64dc6132013-07-22 20:26:31 -0700349 if (sk_stream_is_writeable(sk))
Arnaldo Carvalho de Melo331968b2005-08-23 21:54:23 -0700350 mask |= POLLOUT | POLLWRNORM;
351 }
352 }
353 }
354 return mask;
355}
356
Arnaldo Carvalho de Melof21e68c2005-12-13 23:24:16 -0800357EXPORT_SYMBOL_GPL(dccp_poll);
358
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700359int dccp_ioctl(struct sock *sk, int cmd, unsigned long arg)
360{
Arnaldo Carvalho de Melo62731722007-10-23 20:23:30 -0700361 int rc = -ENOTCONN;
362
363 lock_sock(sk);
364
365 if (sk->sk_state == DCCP_LISTEN)
366 goto out;
367
368 switch (cmd) {
369 case SIOCINQ: {
370 struct sk_buff *skb;
371 unsigned long amount = 0;
372
373 skb = skb_peek(&sk->sk_receive_queue);
374 if (skb != NULL) {
375 /*
376 * We will only return the amount of this packet since
377 * that is all that will be read.
378 */
379 amount = skb->len;
380 }
381 rc = put_user(amount, (int __user *)arg);
382 }
383 break;
384 default:
385 rc = -ENOIOCTLCMD;
386 break;
387 }
388out:
389 release_sock(sk);
390 return rc;
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700391}
392
Arnaldo Carvalho de Melof21e68c2005-12-13 23:24:16 -0800393EXPORT_SYMBOL_GPL(dccp_ioctl);
394
Andrea Bittau60fe62e2006-03-20 19:23:32 -0800395static int dccp_setsockopt_service(struct sock *sk, const __be32 service,
David S. Millerb7058842009-09-30 16:12:20 -0700396 char __user *optval, unsigned int optlen)
Arnaldo Carvalho de Melo67e6b622005-09-16 16:58:40 -0700397{
398 struct dccp_sock *dp = dccp_sk(sk);
399 struct dccp_service_list *sl = NULL;
400
Arnaldo Carvalho de Melo8109b022006-12-10 16:01:18 -0200401 if (service == DCCP_SERVICE_INVALID_VALUE ||
Arnaldo Carvalho de Melo67e6b622005-09-16 16:58:40 -0700402 optlen > DCCP_SERVICE_LIST_MAX_LEN * sizeof(u32))
403 return -EINVAL;
404
405 if (optlen > sizeof(service)) {
406 sl = kmalloc(optlen, GFP_KERNEL);
407 if (sl == NULL)
408 return -ENOMEM;
409
410 sl->dccpsl_nr = optlen / sizeof(u32) - 1;
411 if (copy_from_user(sl->dccpsl_list,
412 optval + sizeof(service),
413 optlen - sizeof(service)) ||
414 dccp_list_has_service(sl, DCCP_SERVICE_INVALID_VALUE)) {
415 kfree(sl);
416 return -EFAULT;
417 }
418 }
419
420 lock_sock(sk);
421 dp->dccps_service = service;
422
Jesper Juhla51482b2005-11-08 09:41:34 -0800423 kfree(dp->dccps_service_list);
Arnaldo Carvalho de Melo67e6b622005-09-16 16:58:40 -0700424
425 dp->dccps_service_list = sl;
426 release_sock(sk);
427 return 0;
428}
429
Gerrit Renker29450552008-11-16 22:53:48 -0800430static int dccp_setsockopt_cscov(struct sock *sk, int cscov, bool rx)
431{
432 u8 *list, len;
433 int i, rc;
434
435 if (cscov < 0 || cscov > 15)
436 return -EINVAL;
437 /*
438 * Populate a list of permissible values, in the range cscov...15. This
439 * is necessary since feature negotiation of single values only works if
440 * both sides incidentally choose the same value. Since the list starts
441 * lowest-value first, negotiation will pick the smallest shared value.
442 */
443 if (cscov == 0)
444 return 0;
445 len = 16 - cscov;
446
447 list = kmalloc(len, GFP_KERNEL);
448 if (list == NULL)
449 return -ENOBUFS;
450
451 for (i = 0; i < len; i++)
452 list[i] = cscov++;
453
454 rc = dccp_feat_register_sp(sk, DCCPF_MIN_CSUM_COVER, rx, list, len);
455
456 if (rc == 0) {
457 if (rx)
458 dccp_sk(sk)->dccps_pcrlen = cscov;
459 else
460 dccp_sk(sk)->dccps_pcslen = cscov;
461 }
462 kfree(list);
463 return rc;
464}
465
Gerrit Renkerb20a9c22008-11-23 16:02:31 -0800466static int dccp_setsockopt_ccid(struct sock *sk, int type,
David S. Millerb7058842009-09-30 16:12:20 -0700467 char __user *optval, unsigned int optlen)
Gerrit Renkerb20a9c22008-11-23 16:02:31 -0800468{
469 u8 *val;
470 int rc = 0;
471
472 if (optlen < 1 || optlen > DCCP_FEAT_MAX_SP_VALS)
473 return -EINVAL;
474
Julia Lawall042604d2010-05-21 22:25:19 +0000475 val = memdup_user(optval, optlen);
476 if (IS_ERR(val))
477 return PTR_ERR(val);
Gerrit Renkerb20a9c22008-11-23 16:02:31 -0800478
479 lock_sock(sk);
480 if (type == DCCP_SOCKOPT_TX_CCID || type == DCCP_SOCKOPT_CCID)
481 rc = dccp_feat_register_sp(sk, DCCPF_CCID, 1, val, optlen);
482
483 if (!rc && (type == DCCP_SOCKOPT_RX_CCID || type == DCCP_SOCKOPT_CCID))
484 rc = dccp_feat_register_sp(sk, DCCPF_CCID, 0, val, optlen);
485 release_sock(sk);
486
487 kfree(val);
488 return rc;
489}
490
Dmitry Mishin3fdadf72006-03-20 22:45:21 -0800491static int do_dccp_setsockopt(struct sock *sk, int level, int optname,
David S. Millerb7058842009-09-30 16:12:20 -0700492 char __user *optval, unsigned int optlen)
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700493{
Gerrit Renker09dbc382006-11-14 12:57:34 -0200494 struct dccp_sock *dp = dccp_sk(sk);
495 int val, err = 0;
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700496
Gerrit Renker19102992008-11-16 22:56:55 -0800497 switch (optname) {
498 case DCCP_SOCKOPT_PACKET_SIZE:
499 DCCP_WARN("sockopt(PACKET_SIZE) is deprecated: fix your app\n");
500 return 0;
501 case DCCP_SOCKOPT_CHANGE_L:
502 case DCCP_SOCKOPT_CHANGE_R:
503 DCCP_WARN("sockopt(CHANGE_L/R) is deprecated: fix your app\n");
504 return 0;
Gerrit Renkerb20a9c22008-11-23 16:02:31 -0800505 case DCCP_SOCKOPT_CCID:
506 case DCCP_SOCKOPT_RX_CCID:
507 case DCCP_SOCKOPT_TX_CCID:
508 return dccp_setsockopt_ccid(sk, optname, optval, optlen);
Gerrit Renker19102992008-11-16 22:56:55 -0800509 }
510
511 if (optlen < (int)sizeof(int))
Arnaldo Carvalho de Meloa84ffe42005-08-28 04:51:32 -0300512 return -EINVAL;
513
514 if (get_user(val, (int __user *)optval))
515 return -EFAULT;
516
Arnaldo Carvalho de Melo67e6b622005-09-16 16:58:40 -0700517 if (optname == DCCP_SOCKOPT_SERVICE)
518 return dccp_setsockopt_service(sk, val, optval, optlen);
Arnaldo Carvalho de Meloa84ffe42005-08-28 04:51:32 -0300519
Arnaldo Carvalho de Melo67e6b622005-09-16 16:58:40 -0700520 lock_sock(sk);
Arnaldo Carvalho de Meloa84ffe42005-08-28 04:51:32 -0300521 switch (optname) {
Gerrit Renkerb8599d22007-12-13 12:25:01 -0200522 case DCCP_SOCKOPT_SERVER_TIMEWAIT:
523 if (dp->dccps_role != DCCP_ROLE_SERVER)
524 err = -EOPNOTSUPP;
525 else
526 dp->dccps_server_timewait = (val != 0);
527 break;
Gerrit Renker29450552008-11-16 22:53:48 -0800528 case DCCP_SOCKOPT_SEND_CSCOV:
529 err = dccp_setsockopt_cscov(sk, val, false);
Tomasz Grobelnyd6da3512008-09-04 07:30:19 +0200530 break;
Gerrit Renker29450552008-11-16 22:53:48 -0800531 case DCCP_SOCKOPT_RECV_CSCOV:
532 err = dccp_setsockopt_cscov(sk, val, true);
Tomasz Grobelnyd6da3512008-09-04 07:30:19 +0200533 break;
Tomasz Grobelny871a2c12010-12-04 13:38:01 +0100534 case DCCP_SOCKOPT_QPOLICY_ID:
535 if (sk->sk_state != DCCP_CLOSED)
536 err = -EISCONN;
537 else if (val < 0 || val >= DCCPQ_POLICY_MAX)
538 err = -EINVAL;
539 else
540 dp->dccps_qpolicy = val;
541 break;
542 case DCCP_SOCKOPT_QPOLICY_TXQLEN:
543 if (val < 0)
544 err = -EINVAL;
545 else
546 dp->dccps_tx_qlen = val;
547 break;
Arnaldo Carvalho de Meloa84ffe42005-08-28 04:51:32 -0300548 default:
549 err = -ENOPROTOOPT;
550 break;
551 }
Gerrit Renker410e27a2008-09-09 13:27:22 +0200552 release_sock(sk);
Gerrit Renker19102992008-11-16 22:56:55 -0800553
Arnaldo Carvalho de Meloa84ffe42005-08-28 04:51:32 -0300554 return err;
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700555}
556
Dmitry Mishin3fdadf72006-03-20 22:45:21 -0800557int dccp_setsockopt(struct sock *sk, int level, int optname,
David S. Millerb7058842009-09-30 16:12:20 -0700558 char __user *optval, unsigned int optlen)
Dmitry Mishin3fdadf72006-03-20 22:45:21 -0800559{
560 if (level != SOL_DCCP)
561 return inet_csk(sk)->icsk_af_ops->setsockopt(sk, level,
562 optname, optval,
563 optlen);
564 return do_dccp_setsockopt(sk, level, optname, optval, optlen);
565}
Arnaldo Carvalho de Melo543d9cf2006-03-20 22:48:35 -0800566
Arnaldo Carvalho de Melof21e68c2005-12-13 23:24:16 -0800567EXPORT_SYMBOL_GPL(dccp_setsockopt);
568
Dmitry Mishin3fdadf72006-03-20 22:45:21 -0800569#ifdef CONFIG_COMPAT
570int compat_dccp_setsockopt(struct sock *sk, int level, int optname,
David S. Millerb7058842009-09-30 16:12:20 -0700571 char __user *optval, unsigned int optlen)
Dmitry Mishin3fdadf72006-03-20 22:45:21 -0800572{
Arnaldo Carvalho de Melodec73ff2006-03-20 22:46:16 -0800573 if (level != SOL_DCCP)
574 return inet_csk_compat_setsockopt(sk, level, optname,
575 optval, optlen);
Dmitry Mishin3fdadf72006-03-20 22:45:21 -0800576 return do_dccp_setsockopt(sk, level, optname, optval, optlen);
577}
Arnaldo Carvalho de Melo543d9cf2006-03-20 22:48:35 -0800578
Dmitry Mishin3fdadf72006-03-20 22:45:21 -0800579EXPORT_SYMBOL_GPL(compat_dccp_setsockopt);
580#endif
581
Arnaldo Carvalho de Melo67e6b622005-09-16 16:58:40 -0700582static int dccp_getsockopt_service(struct sock *sk, int len,
Andrea Bittau60fe62e2006-03-20 19:23:32 -0800583 __be32 __user *optval,
Arnaldo Carvalho de Melo67e6b622005-09-16 16:58:40 -0700584 int __user *optlen)
585{
586 const struct dccp_sock *dp = dccp_sk(sk);
587 const struct dccp_service_list *sl;
588 int err = -ENOENT, slen = 0, total_len = sizeof(u32);
589
590 lock_sock(sk);
Arnaldo Carvalho de Melo67e6b622005-09-16 16:58:40 -0700591 if ((sl = dp->dccps_service_list) != NULL) {
592 slen = sl->dccpsl_nr * sizeof(u32);
593 total_len += slen;
594 }
595
596 err = -EINVAL;
597 if (total_len > len)
598 goto out;
599
600 err = 0;
601 if (put_user(total_len, optlen) ||
602 put_user(dp->dccps_service, optval) ||
603 (sl != NULL && copy_to_user(optval + 1, sl->dccpsl_list, slen)))
604 err = -EFAULT;
605out:
606 release_sock(sk);
607 return err;
608}
609
Dmitry Mishin3fdadf72006-03-20 22:45:21 -0800610static int do_dccp_getsockopt(struct sock *sk, int level, int optname,
Arnaldo Carvalho de Meloa1d3a352005-08-13 22:42:25 -0300611 char __user *optval, int __user *optlen)
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700612{
Arnaldo Carvalho de Meloa84ffe42005-08-28 04:51:32 -0300613 struct dccp_sock *dp;
614 int val, len;
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700615
Arnaldo Carvalho de Meloa84ffe42005-08-28 04:51:32 -0300616 if (get_user(len, optlen))
617 return -EFAULT;
618
Arnaldo Carvalho de Melo39ebc022007-03-28 11:54:32 -0700619 if (len < (int)sizeof(int))
Arnaldo Carvalho de Meloa84ffe42005-08-28 04:51:32 -0300620 return -EINVAL;
621
622 dp = dccp_sk(sk);
623
624 switch (optname) {
625 case DCCP_SOCKOPT_PACKET_SIZE:
Gerrit Renker5aed3242006-11-28 19:33:36 -0200626 DCCP_WARN("sockopt(PACKET_SIZE) is deprecated: fix your app\n");
Arnaldo Carvalho de Melo841bac12006-11-28 19:42:03 -0200627 return 0;
Arnaldo Carvalho de Melo88f964d2005-09-18 00:19:32 -0700628 case DCCP_SOCKOPT_SERVICE:
629 return dccp_getsockopt_service(sk, len,
Andrea Bittau60fe62e2006-03-20 19:23:32 -0800630 (__be32 __user *)optval, optlen);
Gerrit Renker7c559a92007-10-04 14:39:22 -0700631 case DCCP_SOCKOPT_GET_CUR_MPS:
632 val = dp->dccps_mss_cache;
Gerrit Renker7c559a92007-10-04 14:39:22 -0700633 break;
Gerrit Renkerd90ebcb2008-11-12 00:47:26 -0800634 case DCCP_SOCKOPT_AVAILABLE_CCIDS:
635 return ccid_getsockopt_builtin_ccids(sk, len, optval, optlen);
Gerrit Renker71c262a2008-11-23 16:04:59 -0800636 case DCCP_SOCKOPT_TX_CCID:
637 val = ccid_get_current_tx_ccid(dp);
638 if (val < 0)
639 return -ENOPROTOOPT;
640 break;
641 case DCCP_SOCKOPT_RX_CCID:
642 val = ccid_get_current_rx_ccid(dp);
643 if (val < 0)
644 return -ENOPROTOOPT;
645 break;
Gerrit Renkerb8599d22007-12-13 12:25:01 -0200646 case DCCP_SOCKOPT_SERVER_TIMEWAIT:
647 val = dp->dccps_server_timewait;
Gerrit Renkerb8599d22007-12-13 12:25:01 -0200648 break;
Gerrit Renker6f4e5ff2006-11-10 17:43:06 -0200649 case DCCP_SOCKOPT_SEND_CSCOV:
650 val = dp->dccps_pcslen;
651 break;
652 case DCCP_SOCKOPT_RECV_CSCOV:
653 val = dp->dccps_pcrlen;
654 break;
Tomasz Grobelny871a2c12010-12-04 13:38:01 +0100655 case DCCP_SOCKOPT_QPOLICY_ID:
656 val = dp->dccps_qpolicy;
657 break;
658 case DCCP_SOCKOPT_QPOLICY_TXQLEN:
659 val = dp->dccps_tx_qlen;
660 break;
Arnaldo Carvalho de Melo88f964d2005-09-18 00:19:32 -0700661 case 128 ... 191:
662 return ccid_hc_rx_getsockopt(dp->dccps_hc_rx_ccid, sk, optname,
663 len, (u32 __user *)optval, optlen);
664 case 192 ... 255:
665 return ccid_hc_tx_getsockopt(dp->dccps_hc_tx_ccid, sk, optname,
666 len, (u32 __user *)optval, optlen);
Arnaldo Carvalho de Meloa84ffe42005-08-28 04:51:32 -0300667 default:
668 return -ENOPROTOOPT;
669 }
670
Gerrit Renker79133502007-12-13 12:27:14 -0200671 len = sizeof(val);
Arnaldo Carvalho de Meloa84ffe42005-08-28 04:51:32 -0300672 if (put_user(len, optlen) || copy_to_user(optval, &val, len))
673 return -EFAULT;
674
675 return 0;
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700676}
677
Dmitry Mishin3fdadf72006-03-20 22:45:21 -0800678int dccp_getsockopt(struct sock *sk, int level, int optname,
679 char __user *optval, int __user *optlen)
680{
681 if (level != SOL_DCCP)
682 return inet_csk(sk)->icsk_af_ops->getsockopt(sk, level,
683 optname, optval,
684 optlen);
685 return do_dccp_getsockopt(sk, level, optname, optval, optlen);
686}
Arnaldo Carvalho de Melo543d9cf2006-03-20 22:48:35 -0800687
Arnaldo Carvalho de Melof21e68c2005-12-13 23:24:16 -0800688EXPORT_SYMBOL_GPL(dccp_getsockopt);
689
Dmitry Mishin3fdadf72006-03-20 22:45:21 -0800690#ifdef CONFIG_COMPAT
691int compat_dccp_getsockopt(struct sock *sk, int level, int optname,
Arnaldo Carvalho de Melo543d9cf2006-03-20 22:48:35 -0800692 char __user *optval, int __user *optlen)
Dmitry Mishin3fdadf72006-03-20 22:45:21 -0800693{
Arnaldo Carvalho de Melodec73ff2006-03-20 22:46:16 -0800694 if (level != SOL_DCCP)
695 return inet_csk_compat_getsockopt(sk, level, optname,
696 optval, optlen);
Dmitry Mishin3fdadf72006-03-20 22:45:21 -0800697 return do_dccp_getsockopt(sk, level, optname, optval, optlen);
698}
Arnaldo Carvalho de Melo543d9cf2006-03-20 22:48:35 -0800699
Dmitry Mishin3fdadf72006-03-20 22:45:21 -0800700EXPORT_SYMBOL_GPL(compat_dccp_getsockopt);
701#endif
702
Tomasz Grobelny871a2c12010-12-04 13:38:01 +0100703static int dccp_msghdr_parse(struct msghdr *msg, struct sk_buff *skb)
704{
Gu Zhengf95b4142014-12-11 11:22:04 +0800705 struct cmsghdr *cmsg;
Tomasz Grobelny871a2c12010-12-04 13:38:01 +0100706
707 /*
708 * Assign an (opaque) qpolicy priority value to skb->priority.
709 *
710 * We are overloading this skb field for use with the qpolicy subystem.
711 * The skb->priority is normally used for the SO_PRIORITY option, which
712 * is initialised from sk_priority. Since the assignment of sk_priority
713 * to skb->priority happens later (on layer 3), we overload this field
714 * for use with queueing priorities as long as the skb is on layer 4.
715 * The default priority value (if nothing is set) is 0.
716 */
717 skb->priority = 0;
718
Gu Zhengf95b4142014-12-11 11:22:04 +0800719 for_each_cmsghdr(cmsg, msg) {
Tomasz Grobelny871a2c12010-12-04 13:38:01 +0100720 if (!CMSG_OK(msg, cmsg))
721 return -EINVAL;
722
723 if (cmsg->cmsg_level != SOL_DCCP)
724 continue;
725
Tomasz Grobelny04910262010-12-04 13:39:13 +0100726 if (cmsg->cmsg_type <= DCCP_SCM_QPOLICY_MAX &&
727 !dccp_qpolicy_param_ok(skb->sk, cmsg->cmsg_type))
728 return -EINVAL;
729
Tomasz Grobelny871a2c12010-12-04 13:38:01 +0100730 switch (cmsg->cmsg_type) {
731 case DCCP_SCM_PRIORITY:
732 if (cmsg->cmsg_len != CMSG_LEN(sizeof(__u32)))
733 return -EINVAL;
734 skb->priority = *(__u32 *)CMSG_DATA(cmsg);
735 break;
736 default:
737 return -EINVAL;
738 }
739 }
740 return 0;
741}
742
Ying Xue1b784142015-03-02 15:37:48 +0800743int dccp_sendmsg(struct sock *sk, struct msghdr *msg, size_t len)
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700744{
745 const struct dccp_sock *dp = dccp_sk(sk);
746 const int flags = msg->msg_flags;
747 const int noblock = flags & MSG_DONTWAIT;
748 struct sk_buff *skb;
749 int rc, size;
750 long timeo;
751
752 if (len > dp->dccps_mss_cache)
753 return -EMSGSIZE;
754
755 lock_sock(sk);
Ian McDonaldb1308dc2006-11-20 18:30:17 -0200756
Tomasz Grobelny871a2c12010-12-04 13:38:01 +0100757 if (dccp_qpolicy_full(sk)) {
Ian McDonaldb1308dc2006-11-20 18:30:17 -0200758 rc = -EAGAIN;
759 goto out_release;
760 }
761
Arnaldo Carvalho de Melo27258ee2005-08-09 20:30:56 -0700762 timeo = sock_sndtimeo(sk, noblock);
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700763
764 /*
765 * We have to use sk_stream_wait_connect here to set sk_write_pending,
766 * so that the trick in dccp_rcv_request_sent_state_process.
767 */
768 /* Wait for a connection to finish. */
Gerrit Renkercecd8d02007-09-26 19:36:08 -0300769 if ((1 << sk->sk_state) & ~(DCCPF_OPEN | DCCPF_PARTOPEN))
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700770 if ((rc = sk_stream_wait_connect(sk, &timeo)) != 0)
Arnaldo Carvalho de Melo27258ee2005-08-09 20:30:56 -0700771 goto out_release;
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700772
773 size = sk->sk_prot->max_header + len;
774 release_sock(sk);
775 skb = sock_alloc_send_skb(sk, size, noblock, &rc);
776 lock_sock(sk);
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700777 if (skb == NULL)
778 goto out_release;
779
780 skb_reserve(skb, sk->sk_prot->max_header);
Al Viro6ce8e9c2014-04-06 21:25:44 -0400781 rc = memcpy_from_msg(skb_put(skb, len), msg, len);
Arnaldo Carvalho de Melo27258ee2005-08-09 20:30:56 -0700782 if (rc != 0)
783 goto out_discard;
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700784
Tomasz Grobelny871a2c12010-12-04 13:38:01 +0100785 rc = dccp_msghdr_parse(msg, skb);
786 if (rc != 0)
787 goto out_discard;
788
789 dccp_qpolicy_push(sk, skb);
Gerrit Renkerb1fcf552010-10-27 19:16:27 +0000790 /*
791 * The xmit_timer is set if the TX CCID is rate-based and will expire
792 * when congestion control permits to release further packets into the
793 * network. Window-based CCIDs do not use this timer.
794 */
795 if (!timer_pending(&dp->dccps_xmit_timer))
796 dccp_write_xmit(sk);
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700797out_release:
798 release_sock(sk);
799 return rc ? : len;
Arnaldo Carvalho de Melo27258ee2005-08-09 20:30:56 -0700800out_discard:
801 kfree_skb(skb);
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700802 goto out_release;
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700803}
804
Arnaldo Carvalho de Melof21e68c2005-12-13 23:24:16 -0800805EXPORT_SYMBOL_GPL(dccp_sendmsg);
806
Ying Xue1b784142015-03-02 15:37:48 +0800807int dccp_recvmsg(struct sock *sk, struct msghdr *msg, size_t len, int nonblock,
808 int flags, int *addr_len)
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700809{
810 const struct dccp_hdr *dh;
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700811 long timeo;
812
813 lock_sock(sk);
814
Arnaldo Carvalho de Melo531669a2005-08-13 20:35:17 -0300815 if (sk->sk_state == DCCP_LISTEN) {
816 len = -ENOTCONN;
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700817 goto out;
Arnaldo Carvalho de Melo531669a2005-08-13 20:35:17 -0300818 }
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700819
820 timeo = sock_rcvtimeo(sk, nonblock);
821
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700822 do {
Arnaldo Carvalho de Melo531669a2005-08-13 20:35:17 -0300823 struct sk_buff *skb = skb_peek(&sk->sk_receive_queue);
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700824
Arnaldo Carvalho de Melo531669a2005-08-13 20:35:17 -0300825 if (skb == NULL)
826 goto verify_sock_status;
827
828 dh = dccp_hdr(skb);
829
Gerrit Renker0c869622007-11-28 11:59:48 -0200830 switch (dh->dccph_type) {
831 case DCCP_PKT_DATA:
832 case DCCP_PKT_DATAACK:
Arnaldo Carvalho de Melo531669a2005-08-13 20:35:17 -0300833 goto found_ok_skb;
834
Gerrit Renker0c869622007-11-28 11:59:48 -0200835 case DCCP_PKT_CLOSE:
836 case DCCP_PKT_CLOSEREQ:
837 if (!(flags & MSG_PEEK))
838 dccp_finish_passive_close(sk);
839 /* fall through */
840 case DCCP_PKT_RESET:
841 dccp_pr_debug("found fin (%s) ok!\n",
842 dccp_packet_name(dh->dccph_type));
Arnaldo Carvalho de Melo531669a2005-08-13 20:35:17 -0300843 len = 0;
844 goto found_fin_ok;
Gerrit Renker0c869622007-11-28 11:59:48 -0200845 default:
846 dccp_pr_debug("packet_type=%s\n",
847 dccp_packet_name(dh->dccph_type));
Dan Williams7bced392013-12-30 12:37:29 -0800848 sk_eat_skb(sk, skb);
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700849 }
Arnaldo Carvalho de Melo531669a2005-08-13 20:35:17 -0300850verify_sock_status:
851 if (sock_flag(sk, SOCK_DONE)) {
852 len = 0;
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700853 break;
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700854 }
855
Arnaldo Carvalho de Melo531669a2005-08-13 20:35:17 -0300856 if (sk->sk_err) {
857 len = sock_error(sk);
858 break;
859 }
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700860
Arnaldo Carvalho de Melo531669a2005-08-13 20:35:17 -0300861 if (sk->sk_shutdown & RCV_SHUTDOWN) {
862 len = 0;
863 break;
864 }
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700865
Arnaldo Carvalho de Melo531669a2005-08-13 20:35:17 -0300866 if (sk->sk_state == DCCP_CLOSED) {
867 if (!sock_flag(sk, SOCK_DONE)) {
868 /* This occurs when user tries to read
869 * from never connected socket.
870 */
871 len = -ENOTCONN;
872 break;
873 }
874 len = 0;
875 break;
876 }
877
878 if (!timeo) {
879 len = -EAGAIN;
880 break;
881 }
882
883 if (signal_pending(current)) {
884 len = sock_intr_errno(timeo);
885 break;
886 }
887
Sabrina Dubrocadfbafc92015-07-24 18:19:25 +0200888 sk_wait_data(sk, &timeo, NULL);
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700889 continue;
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700890 found_ok_skb:
Arnaldo Carvalho de Melo531669a2005-08-13 20:35:17 -0300891 if (len > skb->len)
892 len = skb->len;
893 else if (len < skb->len)
894 msg->msg_flags |= MSG_TRUNC;
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700895
David S. Miller51f3d022014-11-05 16:46:40 -0500896 if (skb_copy_datagram_msg(skb, 0, msg, len)) {
Arnaldo Carvalho de Melo531669a2005-08-13 20:35:17 -0300897 /* Exception. Bailout! */
898 len = -EFAULT;
899 break;
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700900 }
Gerrit Renker55d95592010-02-10 20:26:18 +0000901 if (flags & MSG_TRUNC)
902 len = skb->len;
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700903 found_fin_ok:
904 if (!(flags & MSG_PEEK))
Dan Williams7bced392013-12-30 12:37:29 -0800905 sk_eat_skb(sk, skb);
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700906 break;
Arnaldo Carvalho de Melo531669a2005-08-13 20:35:17 -0300907 } while (1);
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700908out:
909 release_sock(sk);
Arnaldo Carvalho de Melo531669a2005-08-13 20:35:17 -0300910 return len;
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700911}
912
Arnaldo Carvalho de Melof21e68c2005-12-13 23:24:16 -0800913EXPORT_SYMBOL_GPL(dccp_recvmsg);
914
915int inet_dccp_listen(struct socket *sock, int backlog)
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700916{
917 struct sock *sk = sock->sk;
918 unsigned char old_state;
919 int err;
920
921 lock_sock(sk);
922
923 err = -EINVAL;
924 if (sock->state != SS_UNCONNECTED || sock->type != SOCK_DCCP)
925 goto out;
926
927 old_state = sk->sk_state;
928 if (!((1 << old_state) & (DCCPF_CLOSED | DCCPF_LISTEN)))
929 goto out;
930
931 /* Really, if the socket is already in listen state
932 * we can only allow the backlog to be adjusted.
933 */
934 if (old_state != DCCP_LISTEN) {
935 /*
936 * FIXME: here it probably should be sk->sk_prot->listen_start
937 * see tcp_listen_start
938 */
Eric Dumazet72a3eff2006-11-16 02:30:37 -0800939 err = dccp_listen_start(sk, backlog);
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700940 if (err)
941 goto out;
942 }
943 sk->sk_max_ack_backlog = backlog;
944 err = 0;
945
946out:
947 release_sock(sk);
948 return err;
949}
950
Arnaldo Carvalho de Melof21e68c2005-12-13 23:24:16 -0800951EXPORT_SYMBOL_GPL(inet_dccp_listen);
952
Gerrit Renker0c869622007-11-28 11:59:48 -0200953static void dccp_terminate_connection(struct sock *sk)
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700954{
Gerrit Renker0c869622007-11-28 11:59:48 -0200955 u8 next_state = DCCP_CLOSED;
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700956
Gerrit Renker0c869622007-11-28 11:59:48 -0200957 switch (sk->sk_state) {
958 case DCCP_PASSIVE_CLOSE:
959 case DCCP_PASSIVE_CLOSEREQ:
960 dccp_finish_passive_close(sk);
961 break;
962 case DCCP_PARTOPEN:
963 dccp_pr_debug("Stop PARTOPEN timer (%p)\n", sk);
964 inet_csk_clear_xmit_timer(sk, ICSK_TIME_DACK);
965 /* fall through */
966 case DCCP_OPEN:
967 dccp_send_close(sk, 1);
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700968
Gerrit Renkerb8599d22007-12-13 12:25:01 -0200969 if (dccp_sk(sk)->dccps_role == DCCP_ROLE_SERVER &&
970 !dccp_sk(sk)->dccps_server_timewait)
Gerrit Renker0c869622007-11-28 11:59:48 -0200971 next_state = DCCP_ACTIVE_CLOSEREQ;
972 else
973 next_state = DCCP_CLOSING;
974 /* fall through */
975 default:
976 dccp_set_state(sk, next_state);
977 }
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700978}
979
980void dccp_close(struct sock *sk, long timeout)
981{
Ian McDonald97e58482006-08-26 19:16:45 -0700982 struct dccp_sock *dp = dccp_sk(sk);
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700983 struct sk_buff *skb;
Gerrit Renkerd83bd952007-12-16 16:06:03 -0800984 u32 data_was_unread = 0;
Herbert Xu134af342006-05-05 17:09:13 -0700985 int state;
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700986
987 lock_sock(sk);
988
989 sk->sk_shutdown = SHUTDOWN_MASK;
990
991 if (sk->sk_state == DCCP_LISTEN) {
992 dccp_set_state(sk, DCCP_CLOSED);
993
994 /* Special case. */
995 inet_csk_listen_stop(sk);
996
997 goto adjudge_to_death;
998 }
999
Ian McDonald97e58482006-08-26 19:16:45 -07001000 sk_stop_timer(sk, &dp->dccps_xmit_timer);
1001
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -07001002 /*
1003 * We need to flush the recv. buffs. We do this only on the
1004 * descriptor close, not protocol-sourced closes, because the
1005 *reader process may not have drained the data yet!
1006 */
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -07001007 while ((skb = __skb_dequeue(&sk->sk_receive_queue)) != NULL) {
Gerrit Renkerd83bd952007-12-16 16:06:03 -08001008 data_was_unread += skb->len;
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -07001009 __kfree_skb(skb);
1010 }
1011
Gerrit Renkerd83bd952007-12-16 16:06:03 -08001012 if (data_was_unread) {
1013 /* Unread data was tossed, send an appropriate Reset Code */
Gerrit Renker2f34b322010-10-11 20:44:42 +02001014 DCCP_WARN("ABORT with %u bytes unread\n", data_was_unread);
Gerrit Renkerd83bd952007-12-16 16:06:03 -08001015 dccp_send_reset(sk, DCCP_RESET_CODE_ABORTED);
1016 dccp_set_state(sk, DCCP_CLOSED);
1017 } else if (sock_flag(sk, SOCK_LINGER) && !sk->sk_lingertime) {
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -07001018 /* Check zero linger _after_ checking for unread data. */
1019 sk->sk_prot->disconnect(sk, 0);
Gerrit Renker0c869622007-11-28 11:59:48 -02001020 } else if (sk->sk_state != DCCP_CLOSED) {
Gerrit Renkerb1fcf552010-10-27 19:16:27 +00001021 /*
1022 * Normal connection termination. May need to wait if there are
1023 * still packets in the TX queue that are delayed by the CCID.
1024 */
1025 dccp_flush_write_queue(sk, &timeout);
Gerrit Renker0c869622007-11-28 11:59:48 -02001026 dccp_terminate_connection(sk);
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -07001027 }
1028
Gerrit Renkerb1fcf552010-10-27 19:16:27 +00001029 /*
1030 * Flush write queue. This may be necessary in several cases:
1031 * - we have been closed by the peer but still have application data;
1032 * - abortive termination (unread data or zero linger time),
1033 * - normal termination but queue could not be flushed within time limit
1034 */
1035 __skb_queue_purge(&sk->sk_write_queue);
1036
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -07001037 sk_stream_wait_close(sk, timeout);
1038
1039adjudge_to_death:
Herbert Xu134af342006-05-05 17:09:13 -07001040 state = sk->sk_state;
1041 sock_hold(sk);
1042 sock_orphan(sk);
Herbert Xu134af342006-05-05 17:09:13 -07001043
Arnaldo Carvalho de Melo7ad07e72005-08-23 21:50:06 -07001044 /*
1045 * It is the last release_sock in its life. It will remove backlog.
1046 */
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -07001047 release_sock(sk);
1048 /*
1049 * Now socket is owned by kernel and we acquire BH lock
1050 * to finish close. No need to check for user refs.
1051 */
1052 local_bh_disable();
1053 bh_lock_sock(sk);
Ilpo Järvinen547b7922008-07-25 21:43:18 -07001054 WARN_ON(sock_owned_by_user(sk));
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -07001055
Herbert Xueb4dea52008-12-29 23:04:08 -08001056 percpu_counter_inc(sk->sk_prot->orphan_count);
1057
Herbert Xu134af342006-05-05 17:09:13 -07001058 /* Have we already been destroyed by a softirq or backlog? */
1059 if (state != DCCP_CLOSED && sk->sk_state == DCCP_CLOSED)
1060 goto out;
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -07001061
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -07001062 if (sk->sk_state == DCCP_CLOSED)
1063 inet_csk_destroy_sock(sk);
1064
1065 /* Otherwise, socket is reprieved until protocol close. */
1066
Herbert Xu134af342006-05-05 17:09:13 -07001067out:
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -07001068 bh_unlock_sock(sk);
1069 local_bh_enable();
1070 sock_put(sk);
1071}
1072
Arnaldo Carvalho de Melof21e68c2005-12-13 23:24:16 -08001073EXPORT_SYMBOL_GPL(dccp_close);
1074
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -07001075void dccp_shutdown(struct sock *sk, int how)
1076{
Gerrit Renker8e8c71f2007-11-21 09:56:48 -02001077 dccp_pr_debug("called shutdown(%x)\n", how);
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -07001078}
1079
Arnaldo Carvalho de Melof21e68c2005-12-13 23:24:16 -08001080EXPORT_SYMBOL_GPL(dccp_shutdown);
1081
Fabian Frederick0c5b8a42014-10-01 06:48:03 +02001082static inline int __init dccp_mib_init(void)
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -07001083{
WANG Cong698365f2014-05-05 15:55:55 -07001084 dccp_statistics = alloc_percpu(struct dccp_mib);
1085 if (!dccp_statistics)
1086 return -ENOMEM;
1087 return 0;
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -07001088}
1089
YOSHIFUJI Hideaki24e8b7e2008-04-10 03:48:43 -07001090static inline void dccp_mib_exit(void)
Arnaldo Carvalho de Melo46f09ff2006-03-20 21:24:42 -08001091{
WANG Cong698365f2014-05-05 15:55:55 -07001092 free_percpu(dccp_statistics);
Arnaldo Carvalho de Melo46f09ff2006-03-20 21:24:42 -08001093}
1094
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -07001095static int thash_entries;
1096module_param(thash_entries, int, 0444);
1097MODULE_PARM_DESC(thash_entries, "Number of ehash buckets");
1098
Arnaldo Carvalho de Meloa1d3a352005-08-13 22:42:25 -03001099#ifdef CONFIG_IP_DCCP_DEBUG
Rusty Russelleb939922011-12-19 14:08:01 +00001100bool dccp_debug;
Gerrit Renker43264992008-08-23 13:28:27 +02001101module_param(dccp_debug, bool, 0644);
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -07001102MODULE_PARM_DESC(dccp_debug, "Enable debug messages");
Arnaldo Carvalho de Melof21e68c2005-12-13 23:24:16 -08001103
1104EXPORT_SYMBOL_GPL(dccp_debug);
Arnaldo Carvalho de Meloa1d3a352005-08-13 22:42:25 -03001105#endif
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -07001106
1107static int __init dccp_init(void)
1108{
1109 unsigned long goal;
1110 int ehash_order, bhash_order, i;
Eric Dumazetdd24c002008-11-25 21:17:14 -08001111 int rc;
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -07001112
Patrick McHardy028b0272008-04-12 18:35:41 -07001113 BUILD_BUG_ON(sizeof(struct dccp_skb_cb) >
1114 FIELD_SIZEOF(struct sk_buff, cb));
Tejun Heo908c7f12014-09-08 09:51:29 +09001115 rc = percpu_counter_init(&dccp_orphan_count, 0, GFP_KERNEL);
Eric Dumazetdd24c002008-11-25 21:17:14 -08001116 if (rc)
Gerrit Renkerd14a0eb2010-03-14 20:13:19 +00001117 goto out_fail;
Eric Dumazetdd24c002008-11-25 21:17:14 -08001118 rc = -ENOBUFS;
Eric Dumazet5caea4e2008-11-20 00:40:07 -08001119 inet_hashinfo_init(&dccp_hashinfo);
Arnaldo Carvalho de Melo7690af32005-08-13 20:34:54 -03001120 dccp_hashinfo.bind_bucket_cachep =
1121 kmem_cache_create("dccp_bind_bucket",
1122 sizeof(struct inet_bind_bucket), 0,
Paul Mundt20c2df82007-07-20 10:11:58 +09001123 SLAB_HWCACHE_ALIGN, NULL);
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -07001124 if (!dccp_hashinfo.bind_bucket_cachep)
Eric Dumazetdd24c002008-11-25 21:17:14 -08001125 goto out_free_percpu;
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -07001126
1127 /*
1128 * Size and allocate the main established and bind bucket
1129 * hash tables.
1130 *
1131 * The methodology is similar to that of the buffer cache.
1132 */
Jan Beulich44813742009-09-21 17:03:05 -07001133 if (totalram_pages >= (128 * 1024))
1134 goal = totalram_pages >> (21 - PAGE_SHIFT);
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -07001135 else
Jan Beulich44813742009-09-21 17:03:05 -07001136 goal = totalram_pages >> (23 - PAGE_SHIFT);
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -07001137
1138 if (thash_entries)
Arnaldo Carvalho de Melo7690af32005-08-13 20:34:54 -03001139 goal = (thash_entries *
1140 sizeof(struct inet_ehash_bucket)) >> PAGE_SHIFT;
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -07001141 for (ehash_order = 0; (1UL << ehash_order) < goal; ehash_order++)
1142 ;
1143 do {
Eric Dumazetf373b532009-10-09 00:16:19 +00001144 unsigned long hash_size = (1UL << ehash_order) * PAGE_SIZE /
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -07001145 sizeof(struct inet_ehash_bucket);
Eric Dumazetf373b532009-10-09 00:16:19 +00001146
1147 while (hash_size & (hash_size - 1))
1148 hash_size--;
1149 dccp_hashinfo.ehash_mask = hash_size - 1;
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -07001150 dccp_hashinfo.ehash = (struct inet_ehash_bucket *)
Mel Gorman1c29b3f2009-07-29 15:04:10 -07001151 __get_free_pages(GFP_ATOMIC|__GFP_NOWARN, ehash_order);
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -07001152 } while (!dccp_hashinfo.ehash && --ehash_order > 0);
1153
1154 if (!dccp_hashinfo.ehash) {
Gerrit Renker59348b12006-11-20 18:39:23 -02001155 DCCP_CRIT("Failed to allocate DCCP established hash table");
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -07001156 goto out_free_bind_bucket_cachep;
1157 }
1158
Eric Dumazet05dbc7b2013-10-03 00:22:02 -07001159 for (i = 0; i <= dccp_hashinfo.ehash_mask; i++)
Eric Dumazet3ab5aee2008-11-16 19:40:17 -08001160 INIT_HLIST_NULLS_HEAD(&dccp_hashinfo.ehash[i].chain, i);
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -07001161
Eric Dumazet230140c2007-11-07 02:40:20 -08001162 if (inet_ehash_locks_alloc(&dccp_hashinfo))
1163 goto out_free_dccp_ehash;
1164
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -07001165 bhash_order = ehash_order;
1166
1167 do {
1168 dccp_hashinfo.bhash_size = (1UL << bhash_order) * PAGE_SIZE /
1169 sizeof(struct inet_bind_hashbucket);
Arnaldo Carvalho de Melo7690af32005-08-13 20:34:54 -03001170 if ((dccp_hashinfo.bhash_size > (64 * 1024)) &&
1171 bhash_order > 0)
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -07001172 continue;
1173 dccp_hashinfo.bhash = (struct inet_bind_hashbucket *)
Mel Gorman1c29b3f2009-07-29 15:04:10 -07001174 __get_free_pages(GFP_ATOMIC|__GFP_NOWARN, bhash_order);
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -07001175 } while (!dccp_hashinfo.bhash && --bhash_order >= 0);
1176
1177 if (!dccp_hashinfo.bhash) {
Gerrit Renker59348b12006-11-20 18:39:23 -02001178 DCCP_CRIT("Failed to allocate DCCP bind hash table");
Eric Dumazet230140c2007-11-07 02:40:20 -08001179 goto out_free_dccp_locks;
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -07001180 }
1181
1182 for (i = 0; i < dccp_hashinfo.bhash_size; i++) {
1183 spin_lock_init(&dccp_hashinfo.bhash[i].lock);
1184 INIT_HLIST_HEAD(&dccp_hashinfo.bhash[i].chain);
1185 }
1186
Arnaldo Carvalho de Melo46f09ff2006-03-20 21:24:42 -08001187 rc = dccp_mib_init();
Arnaldo Carvalho de Melofa23e2e2006-03-20 17:16:01 -08001188 if (rc)
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -07001189 goto out_free_dccp_bhash;
1190
Arnaldo Carvalho de Melo9b07ef52006-03-20 17:16:17 -08001191 rc = dccp_ackvec_init();
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -07001192 if (rc)
Arnaldo Carvalho de Melob61fafc2006-03-20 21:25:11 -08001193 goto out_free_dccp_mib;
Arnaldo Carvalho de Melo9b07ef52006-03-20 17:16:17 -08001194
Arnaldo Carvalho de Meloe55d9122006-03-20 19:25:02 -08001195 rc = dccp_sysctl_init();
Arnaldo Carvalho de Melo9b07ef52006-03-20 17:16:17 -08001196 if (rc)
1197 goto out_ackvec_exit;
Gerrit Renker4c70f382007-09-25 22:40:13 -07001198
Gerrit Renkerddebc972009-01-04 21:42:53 -08001199 rc = ccid_initialize_builtins();
1200 if (rc)
1201 goto out_sysctl_exit;
1202
Gerrit Renker4c70f382007-09-25 22:40:13 -07001203 dccp_timestamping_init();
Gerrit Renkerd14a0eb2010-03-14 20:13:19 +00001204
1205 return 0;
1206
Gerrit Renkerddebc972009-01-04 21:42:53 -08001207out_sysctl_exit:
1208 dccp_sysctl_exit();
Arnaldo Carvalho de Melo9b07ef52006-03-20 17:16:17 -08001209out_ackvec_exit:
1210 dccp_ackvec_exit();
Arnaldo Carvalho de Melob61fafc2006-03-20 21:25:11 -08001211out_free_dccp_mib:
Arnaldo Carvalho de Melo46f09ff2006-03-20 21:24:42 -08001212 dccp_mib_exit();
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -07001213out_free_dccp_bhash:
1214 free_pages((unsigned long)dccp_hashinfo.bhash, bhash_order);
Eric Dumazet230140c2007-11-07 02:40:20 -08001215out_free_dccp_locks:
1216 inet_ehash_locks_free(&dccp_hashinfo);
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -07001217out_free_dccp_ehash:
1218 free_pages((unsigned long)dccp_hashinfo.ehash, ehash_order);
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -07001219out_free_bind_bucket_cachep:
1220 kmem_cache_destroy(dccp_hashinfo.bind_bucket_cachep);
Eric Dumazetdd24c002008-11-25 21:17:14 -08001221out_free_percpu:
1222 percpu_counter_destroy(&dccp_orphan_count);
Gerrit Renkerd14a0eb2010-03-14 20:13:19 +00001223out_fail:
1224 dccp_hashinfo.bhash = NULL;
1225 dccp_hashinfo.ehash = NULL;
1226 dccp_hashinfo.bind_bucket_cachep = NULL;
1227 return rc;
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -07001228}
1229
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -07001230static void __exit dccp_fini(void)
1231{
Gerrit Renkerddebc972009-01-04 21:42:53 -08001232 ccid_cleanup_builtins();
Arnaldo Carvalho de Melo46f09ff2006-03-20 21:24:42 -08001233 dccp_mib_exit();
Arnaldo Carvalho de Melo725ba8e2005-08-13 20:35:39 -03001234 free_pages((unsigned long)dccp_hashinfo.bhash,
1235 get_order(dccp_hashinfo.bhash_size *
1236 sizeof(struct inet_bind_hashbucket)));
1237 free_pages((unsigned long)dccp_hashinfo.ehash,
Eric Dumazetf373b532009-10-09 00:16:19 +00001238 get_order((dccp_hashinfo.ehash_mask + 1) *
Arnaldo Carvalho de Melo725ba8e2005-08-13 20:35:39 -03001239 sizeof(struct inet_ehash_bucket)));
Eric Dumazet230140c2007-11-07 02:40:20 -08001240 inet_ehash_locks_free(&dccp_hashinfo);
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -07001241 kmem_cache_destroy(dccp_hashinfo.bind_bucket_cachep);
Arnaldo Carvalho de Melo9b07ef52006-03-20 17:16:17 -08001242 dccp_ackvec_exit();
Arnaldo Carvalho de Meloe55d9122006-03-20 19:25:02 -08001243 dccp_sysctl_exit();
Wei Yongjun476181c2009-08-04 21:44:39 +00001244 percpu_counter_destroy(&dccp_orphan_count);
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -07001245}
1246
1247module_init(dccp_init);
1248module_exit(dccp_fini);
1249
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -07001250MODULE_LICENSE("GPL");
1251MODULE_AUTHOR("Arnaldo Carvalho de Melo <acme@conectiva.com.br>");
1252MODULE_DESCRIPTION("DCCP - Datagram Congestion Controlled Protocol");