blob: 314a1b5c033c88950ddf73eccf30a34bcaf60191 [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>
23#include <net/checksum.h>
24
Arnaldo Carvalho de Melo14c85022005-12-27 02:43:12 -020025#include <net/inet_sock.h>
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -070026#include <net/sock.h>
27#include <net/xfrm.h>
28
Arnaldo Carvalho de Melo62731722007-10-23 20:23:30 -070029#include <asm/ioctls.h>
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -070030#include <linux/spinlock.h>
31#include <linux/timer.h>
32#include <linux/delay.h>
33#include <linux/poll.h>
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -070034
35#include "ccid.h"
36#include "dccp.h"
Andrea Bittauafe00252006-03-20 17:43:56 -080037#include "feat.h"
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -070038
Eric Dumazetba899662005-08-26 12:05:31 -070039DEFINE_SNMP_STAT(struct dccp_mib, dccp_statistics) __read_mostly;
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -070040
Arnaldo Carvalho de Melof21e68c2005-12-13 23:24:16 -080041EXPORT_SYMBOL_GPL(dccp_statistics);
42
Eric Dumazetdd24c002008-11-25 21:17:14 -080043struct percpu_counter dccp_orphan_count;
Arnaldo Carvalho de Melof21e68c2005-12-13 23:24:16 -080044EXPORT_SYMBOL_GPL(dccp_orphan_count);
45
Eric Dumazet5caea4e2008-11-20 00:40:07 -080046struct inet_hashinfo dccp_hashinfo;
Arnaldo Carvalho de Melo075ae862006-03-20 21:24:19 -080047EXPORT_SYMBOL_GPL(dccp_hashinfo);
48
Ian McDonaldb1308dc2006-11-20 18:30:17 -020049/* the maximum queue length for tx in packets. 0 is no limit */
50int sysctl_dccp_tx_qlen __read_mostly = 5;
51
Arnaldo Carvalho de Meloc25a18b2006-03-20 21:58:56 -080052void dccp_set_state(struct sock *sk, const int state)
53{
54 const int oldstate = sk->sk_state;
55
Gerrit Renkerf11135a2007-11-28 11:34:53 -020056 dccp_pr_debug("%s(%p) %s --> %s\n", dccp_role(sk), sk,
Arnaldo Carvalho de Meloc25a18b2006-03-20 21:58:56 -080057 dccp_state_name(oldstate), dccp_state_name(state));
58 WARN_ON(state == oldstate);
59
60 switch (state) {
61 case DCCP_OPEN:
62 if (oldstate != DCCP_OPEN)
63 DCCP_INC_STATS(DCCP_MIB_CURRESTAB);
Gerrit Renker6eb55d12008-12-08 01:15:26 -080064 /* Client retransmits all Confirm options until entering OPEN */
65 if (oldstate == DCCP_PARTOPEN)
66 dccp_feat_list_purge(&dccp_sk(sk)->dccps_featneg);
Arnaldo Carvalho de Meloc25a18b2006-03-20 21:58:56 -080067 break;
68
69 case DCCP_CLOSED:
Gerrit Renker0c869622007-11-28 11:59:48 -020070 if (oldstate == DCCP_OPEN || oldstate == DCCP_ACTIVE_CLOSEREQ ||
71 oldstate == DCCP_CLOSING)
Arnaldo Carvalho de Meloc25a18b2006-03-20 21:58:56 -080072 DCCP_INC_STATS(DCCP_MIB_ESTABRESETS);
73
74 sk->sk_prot->unhash(sk);
75 if (inet_csk(sk)->icsk_bind_hash != NULL &&
76 !(sk->sk_userlocks & SOCK_BINDPORT_LOCK))
Arnaldo Carvalho de Meloab1e0a12008-02-03 04:06:04 -080077 inet_put_port(sk);
Arnaldo Carvalho de Meloc25a18b2006-03-20 21:58:56 -080078 /* fall through */
79 default:
80 if (oldstate == DCCP_OPEN)
81 DCCP_DEC_STATS(DCCP_MIB_CURRESTAB);
82 }
83
84 /* Change state AFTER socket is unhashed to avoid closed
85 * socket sitting in hash tables.
86 */
87 sk->sk_state = state;
88}
89
90EXPORT_SYMBOL_GPL(dccp_set_state);
91
Gerrit Renker0c869622007-11-28 11:59:48 -020092static void dccp_finish_passive_close(struct sock *sk)
93{
94 switch (sk->sk_state) {
95 case DCCP_PASSIVE_CLOSE:
96 /* Node (client or server) has received Close packet. */
97 dccp_send_reset(sk, DCCP_RESET_CODE_CLOSED);
98 dccp_set_state(sk, DCCP_CLOSED);
99 break;
100 case DCCP_PASSIVE_CLOSEREQ:
101 /*
102 * Client received CloseReq. We set the `active' flag so that
103 * dccp_send_close() retransmits the Close as per RFC 4340, 8.3.
104 */
105 dccp_send_close(sk, 1);
106 dccp_set_state(sk, DCCP_CLOSING);
107 }
108}
109
Arnaldo Carvalho de Meloc25a18b2006-03-20 21:58:56 -0800110void dccp_done(struct sock *sk)
111{
112 dccp_set_state(sk, DCCP_CLOSED);
113 dccp_clear_xmit_timers(sk);
114
115 sk->sk_shutdown = SHUTDOWN_MASK;
116
117 if (!sock_flag(sk, SOCK_DEAD))
118 sk->sk_state_change(sk);
119 else
120 inet_csk_destroy_sock(sk);
121}
122
123EXPORT_SYMBOL_GPL(dccp_done);
124
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700125const char *dccp_packet_name(const int type)
126{
127 static const char *dccp_packet_names[] = {
128 [DCCP_PKT_REQUEST] = "REQUEST",
129 [DCCP_PKT_RESPONSE] = "RESPONSE",
130 [DCCP_PKT_DATA] = "DATA",
131 [DCCP_PKT_ACK] = "ACK",
132 [DCCP_PKT_DATAACK] = "DATAACK",
133 [DCCP_PKT_CLOSEREQ] = "CLOSEREQ",
134 [DCCP_PKT_CLOSE] = "CLOSE",
135 [DCCP_PKT_RESET] = "RESET",
136 [DCCP_PKT_SYNC] = "SYNC",
137 [DCCP_PKT_SYNCACK] = "SYNCACK",
138 };
139
140 if (type >= DCCP_NR_PKT_TYPES)
141 return "INVALID";
142 else
143 return dccp_packet_names[type];
144}
145
146EXPORT_SYMBOL_GPL(dccp_packet_name);
147
148const char *dccp_state_name(const int state)
149{
150 static char *dccp_state_names[] = {
Gerrit Renkerf11135a2007-11-28 11:34:53 -0200151 [DCCP_OPEN] = "OPEN",
152 [DCCP_REQUESTING] = "REQUESTING",
153 [DCCP_PARTOPEN] = "PARTOPEN",
154 [DCCP_LISTEN] = "LISTEN",
155 [DCCP_RESPOND] = "RESPOND",
156 [DCCP_CLOSING] = "CLOSING",
157 [DCCP_ACTIVE_CLOSEREQ] = "CLOSEREQ",
158 [DCCP_PASSIVE_CLOSE] = "PASSIVE_CLOSE",
159 [DCCP_PASSIVE_CLOSEREQ] = "PASSIVE_CLOSEREQ",
160 [DCCP_TIME_WAIT] = "TIME_WAIT",
161 [DCCP_CLOSED] = "CLOSED",
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700162 };
163
164 if (state >= DCCP_MAX_STATES)
165 return "INVALID STATE!";
166 else
167 return dccp_state_names[state];
168}
169
170EXPORT_SYMBOL_GPL(dccp_state_name);
171
Arnaldo Carvalho de Melo72478872006-03-20 22:00:37 -0800172int dccp_init_sock(struct sock *sk, const __u8 ctl_sock_initialized)
Arnaldo Carvalho de Melo3e0fadc2006-03-20 21:23:15 -0800173{
174 struct dccp_sock *dp = dccp_sk(sk);
175 struct inet_connection_sock *icsk = inet_csk(sk);
Arnaldo Carvalho de Melo3e0fadc2006-03-20 21:23:15 -0800176
Arnaldo Carvalho de Meloe18d7a92007-11-24 21:42:53 -0200177 icsk->icsk_rto = DCCP_TIMEOUT_INIT;
178 icsk->icsk_syn_retries = sysctl_dccp_request_retries;
179 sk->sk_state = DCCP_CLOSED;
180 sk->sk_write_space = dccp_write_space;
181 icsk->icsk_sync_mss = dccp_sync_mss;
Gerrit Renker410e27a2008-09-09 13:27:22 +0200182 dp->dccps_mss_cache = 536;
Arnaldo Carvalho de Meloe18d7a92007-11-24 21:42:53 -0200183 dp->dccps_rate_last = jiffies;
184 dp->dccps_role = DCCP_ROLE_UNDEFINED;
185 dp->dccps_service = DCCP_SERVICE_CODE_IS_ABSENT;
Gerrit Renker410e27a2008-09-09 13:27:22 +0200186 dp->dccps_l_ack_ratio = dp->dccps_r_ack_ratio = 1;
Arnaldo Carvalho de Meloe18d7a92007-11-24 21:42:53 -0200187
188 dccp_init_xmit_timers(sk);
189
Gerrit Renkerac757732008-11-04 23:55:49 -0800190 INIT_LIST_HEAD(&dp->dccps_featneg);
Gerrit Renker6eb55d12008-12-08 01:15:26 -0800191 /* control socket doesn't need feat nego */
192 if (likely(ctl_sock_initialized))
193 return dccp_feat_init(sk);
Arnaldo Carvalho de Melo3e0fadc2006-03-20 21:23:15 -0800194 return 0;
195}
196
197EXPORT_SYMBOL_GPL(dccp_init_sock);
198
Brian Haley7d06b2e2008-06-14 17:04:49 -0700199void dccp_destroy_sock(struct sock *sk)
Arnaldo Carvalho de Melo3e0fadc2006-03-20 21:23:15 -0800200{
201 struct dccp_sock *dp = dccp_sk(sk);
202
203 /*
204 * DCCP doesn't use sk_write_queue, just sk_send_head
205 * for retransmissions
206 */
207 if (sk->sk_send_head != NULL) {
208 kfree_skb(sk->sk_send_head);
209 sk->sk_send_head = NULL;
210 }
211
212 /* Clean up a referenced DCCP bind bucket. */
213 if (inet_csk(sk)->icsk_bind_hash != NULL)
Arnaldo Carvalho de Meloab1e0a12008-02-03 04:06:04 -0800214 inet_put_port(sk);
Arnaldo Carvalho de Melo3e0fadc2006-03-20 21:23:15 -0800215
216 kfree(dp->dccps_service_list);
217 dp->dccps_service_list = NULL;
218
Gerrit Renker6fdd34d2008-12-08 01:19:06 -0800219 if (dp->dccps_hc_rx_ackvec != NULL) {
Arnaldo Carvalho de Melo3e0fadc2006-03-20 21:23:15 -0800220 dccp_ackvec_free(dp->dccps_hc_rx_ackvec);
221 dp->dccps_hc_rx_ackvec = NULL;
222 }
223 ccid_hc_rx_delete(dp->dccps_hc_rx_ccid, sk);
224 ccid_hc_tx_delete(dp->dccps_hc_tx_ccid, sk);
225 dp->dccps_hc_rx_ccid = dp->dccps_hc_tx_ccid = NULL;
226
227 /* clean up feature negotiation state */
Gerrit Renkerd99a7bd2008-11-04 23:56:30 -0800228 dccp_feat_list_purge(&dp->dccps_featneg);
Arnaldo Carvalho de Melo3e0fadc2006-03-20 21:23:15 -0800229}
230
231EXPORT_SYMBOL_GPL(dccp_destroy_sock);
232
Eric Dumazet72a3eff2006-11-16 02:30:37 -0800233static inline int dccp_listen_start(struct sock *sk, int backlog)
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700234{
Arnaldo Carvalho de Melo67e6b622005-09-16 16:58:40 -0700235 struct dccp_sock *dp = dccp_sk(sk);
236
237 dp->dccps_role = DCCP_ROLE_LISTEN;
Gerrit Renker9eca0a42008-11-12 00:48:44 -0800238 /* do not start to listen if feature negotiation setup fails */
239 if (dccp_feat_finalise_settings(dp))
240 return -EPROTO;
Eric Dumazet72a3eff2006-11-16 02:30:37 -0800241 return inet_csk_listen_start(sk, backlog);
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700242}
243
Gerrit Renkerce865a62007-11-24 22:14:15 -0200244static inline int dccp_need_reset(int state)
245{
246 return state != DCCP_CLOSED && state != DCCP_LISTEN &&
247 state != DCCP_REQUESTING;
248}
249
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700250int dccp_disconnect(struct sock *sk, int flags)
251{
252 struct inet_connection_sock *icsk = inet_csk(sk);
253 struct inet_sock *inet = inet_sk(sk);
254 int err = 0;
255 const int old_state = sk->sk_state;
256
257 if (old_state != DCCP_CLOSED)
258 dccp_set_state(sk, DCCP_CLOSED);
259
Gerrit Renkerce865a62007-11-24 22:14:15 -0200260 /*
261 * This corresponds to the ABORT function of RFC793, sec. 3.8
262 * TCP uses a RST segment, DCCP a Reset packet with Code 2, "Aborted".
263 */
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700264 if (old_state == DCCP_LISTEN) {
265 inet_csk_listen_stop(sk);
Gerrit Renkerce865a62007-11-24 22:14:15 -0200266 } else if (dccp_need_reset(old_state)) {
267 dccp_send_reset(sk, DCCP_RESET_CODE_ABORTED);
268 sk->sk_err = ECONNRESET;
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700269 } else if (old_state == DCCP_REQUESTING)
270 sk->sk_err = ECONNRESET;
271
272 dccp_clear_xmit_timers(sk);
Gerrit Renker48816322008-08-23 13:28:27 +0200273
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700274 __skb_queue_purge(&sk->sk_receive_queue);
Gerrit Renker48816322008-08-23 13:28:27 +0200275 __skb_queue_purge(&sk->sk_write_queue);
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700276 if (sk->sk_send_head != NULL) {
277 __kfree_skb(sk->sk_send_head);
278 sk->sk_send_head = NULL;
279 }
280
281 inet->dport = 0;
282
283 if (!(sk->sk_userlocks & SOCK_BINDADDR_LOCK))
284 inet_reset_saddr(sk);
285
286 sk->sk_shutdown = 0;
287 sock_reset_flag(sk, SOCK_DONE);
288
289 icsk->icsk_backoff = 0;
290 inet_csk_delack_init(sk);
291 __sk_dst_reset(sk);
292
Ilpo Järvinen547b7922008-07-25 21:43:18 -0700293 WARN_ON(inet->num && !icsk->icsk_bind_hash);
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700294
295 sk->sk_error_report(sk);
296 return err;
297}
298
Arnaldo Carvalho de Melof21e68c2005-12-13 23:24:16 -0800299EXPORT_SYMBOL_GPL(dccp_disconnect);
300
Arnaldo Carvalho de Melo331968b2005-08-23 21:54:23 -0700301/*
302 * Wait for a DCCP event.
303 *
304 * Note that we don't need to lock the socket, as the upper poll layers
305 * take care of normal races (between the test and the event) and we don't
306 * go look at any of the socket buffers directly.
307 */
Arnaldo Carvalho de Melof21e68c2005-12-13 23:24:16 -0800308unsigned int dccp_poll(struct file *file, struct socket *sock,
309 poll_table *wait)
Arnaldo Carvalho de Melo331968b2005-08-23 21:54:23 -0700310{
311 unsigned int mask;
312 struct sock *sk = sock->sk;
313
314 poll_wait(file, sk->sk_sleep, wait);
315 if (sk->sk_state == DCCP_LISTEN)
316 return inet_csk_listen_poll(sk);
317
318 /* Socket is not locked. We are protected from async events
319 by poll logic and correct handling of state changes
320 made by another threads is impossible in any case.
321 */
322
323 mask = 0;
324 if (sk->sk_err)
325 mask = POLLERR;
326
327 if (sk->sk_shutdown == SHUTDOWN_MASK || sk->sk_state == DCCP_CLOSED)
328 mask |= POLLHUP;
329 if (sk->sk_shutdown & RCV_SHUTDOWN)
Davide Libenzif348d702006-03-25 03:07:39 -0800330 mask |= POLLIN | POLLRDNORM | POLLRDHUP;
Arnaldo Carvalho de Melo331968b2005-08-23 21:54:23 -0700331
332 /* Connected? */
333 if ((1 << sk->sk_state) & ~(DCCPF_REQUESTING | DCCPF_RESPOND)) {
334 if (atomic_read(&sk->sk_rmem_alloc) > 0)
335 mask |= POLLIN | POLLRDNORM;
336
337 if (!(sk->sk_shutdown & SEND_SHUTDOWN)) {
338 if (sk_stream_wspace(sk) >= sk_stream_min_wspace(sk)) {
339 mask |= POLLOUT | POLLWRNORM;
340 } else { /* send SIGIO later */
341 set_bit(SOCK_ASYNC_NOSPACE,
342 &sk->sk_socket->flags);
343 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 */
349 if (sk_stream_wspace(sk) >= sk_stream_min_wspace(sk))
350 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,
Arnaldo Carvalho de Melo67e6b622005-09-16 16:58:40 -0700396 char __user *optval, int optlen)
397{
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,
467 char __user *optval, int optlen)
468{
469 u8 *val;
470 int rc = 0;
471
472 if (optlen < 1 || optlen > DCCP_FEAT_MAX_SP_VALS)
473 return -EINVAL;
474
475 val = kmalloc(optlen, GFP_KERNEL);
476 if (val == NULL)
477 return -ENOMEM;
478
479 if (copy_from_user(val, optval, optlen)) {
480 kfree(val);
481 return -EFAULT;
482 }
483
484 lock_sock(sk);
485 if (type == DCCP_SOCKOPT_TX_CCID || type == DCCP_SOCKOPT_CCID)
486 rc = dccp_feat_register_sp(sk, DCCPF_CCID, 1, val, optlen);
487
488 if (!rc && (type == DCCP_SOCKOPT_RX_CCID || type == DCCP_SOCKOPT_CCID))
489 rc = dccp_feat_register_sp(sk, DCCPF_CCID, 0, val, optlen);
490 release_sock(sk);
491
492 kfree(val);
493 return rc;
494}
495
Dmitry Mishin3fdadf72006-03-20 22:45:21 -0800496static int do_dccp_setsockopt(struct sock *sk, int level, int optname,
497 char __user *optval, int optlen)
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700498{
Gerrit Renker09dbc382006-11-14 12:57:34 -0200499 struct dccp_sock *dp = dccp_sk(sk);
500 int val, err = 0;
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700501
Gerrit Renker19102992008-11-16 22:56:55 -0800502 switch (optname) {
503 case DCCP_SOCKOPT_PACKET_SIZE:
504 DCCP_WARN("sockopt(PACKET_SIZE) is deprecated: fix your app\n");
505 return 0;
506 case DCCP_SOCKOPT_CHANGE_L:
507 case DCCP_SOCKOPT_CHANGE_R:
508 DCCP_WARN("sockopt(CHANGE_L/R) is deprecated: fix your app\n");
509 return 0;
Gerrit Renkerb20a9c22008-11-23 16:02:31 -0800510 case DCCP_SOCKOPT_CCID:
511 case DCCP_SOCKOPT_RX_CCID:
512 case DCCP_SOCKOPT_TX_CCID:
513 return dccp_setsockopt_ccid(sk, optname, optval, optlen);
Gerrit Renker19102992008-11-16 22:56:55 -0800514 }
515
516 if (optlen < (int)sizeof(int))
Arnaldo Carvalho de Meloa84ffe42005-08-28 04:51:32 -0300517 return -EINVAL;
518
519 if (get_user(val, (int __user *)optval))
520 return -EFAULT;
521
Arnaldo Carvalho de Melo67e6b622005-09-16 16:58:40 -0700522 if (optname == DCCP_SOCKOPT_SERVICE)
523 return dccp_setsockopt_service(sk, val, optval, optlen);
Arnaldo Carvalho de Meloa84ffe42005-08-28 04:51:32 -0300524
Arnaldo Carvalho de Melo67e6b622005-09-16 16:58:40 -0700525 lock_sock(sk);
Arnaldo Carvalho de Meloa84ffe42005-08-28 04:51:32 -0300526 switch (optname) {
Gerrit Renkerb8599d22007-12-13 12:25:01 -0200527 case DCCP_SOCKOPT_SERVER_TIMEWAIT:
528 if (dp->dccps_role != DCCP_ROLE_SERVER)
529 err = -EOPNOTSUPP;
530 else
531 dp->dccps_server_timewait = (val != 0);
532 break;
Gerrit Renker29450552008-11-16 22:53:48 -0800533 case DCCP_SOCKOPT_SEND_CSCOV:
534 err = dccp_setsockopt_cscov(sk, val, false);
Tomasz Grobelnyd6da3512008-09-04 07:30:19 +0200535 break;
Gerrit Renker29450552008-11-16 22:53:48 -0800536 case DCCP_SOCKOPT_RECV_CSCOV:
537 err = dccp_setsockopt_cscov(sk, val, true);
Tomasz Grobelnyd6da3512008-09-04 07:30:19 +0200538 break;
Arnaldo Carvalho de Meloa84ffe42005-08-28 04:51:32 -0300539 default:
540 err = -ENOPROTOOPT;
541 break;
542 }
Gerrit Renker410e27a2008-09-09 13:27:22 +0200543 release_sock(sk);
Gerrit Renker19102992008-11-16 22:56:55 -0800544
Arnaldo Carvalho de Meloa84ffe42005-08-28 04:51:32 -0300545 return err;
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700546}
547
Dmitry Mishin3fdadf72006-03-20 22:45:21 -0800548int dccp_setsockopt(struct sock *sk, int level, int optname,
549 char __user *optval, int optlen)
550{
551 if (level != SOL_DCCP)
552 return inet_csk(sk)->icsk_af_ops->setsockopt(sk, level,
553 optname, optval,
554 optlen);
555 return do_dccp_setsockopt(sk, level, optname, optval, optlen);
556}
Arnaldo Carvalho de Melo543d9cf2006-03-20 22:48:35 -0800557
Arnaldo Carvalho de Melof21e68c2005-12-13 23:24:16 -0800558EXPORT_SYMBOL_GPL(dccp_setsockopt);
559
Dmitry Mishin3fdadf72006-03-20 22:45:21 -0800560#ifdef CONFIG_COMPAT
561int compat_dccp_setsockopt(struct sock *sk, int level, int optname,
Arnaldo Carvalho de Melo543d9cf2006-03-20 22:48:35 -0800562 char __user *optval, int optlen)
Dmitry Mishin3fdadf72006-03-20 22:45:21 -0800563{
Arnaldo Carvalho de Melodec73ff2006-03-20 22:46:16 -0800564 if (level != SOL_DCCP)
565 return inet_csk_compat_setsockopt(sk, level, optname,
566 optval, optlen);
Dmitry Mishin3fdadf72006-03-20 22:45:21 -0800567 return do_dccp_setsockopt(sk, level, optname, optval, optlen);
568}
Arnaldo Carvalho de Melo543d9cf2006-03-20 22:48:35 -0800569
Dmitry Mishin3fdadf72006-03-20 22:45:21 -0800570EXPORT_SYMBOL_GPL(compat_dccp_setsockopt);
571#endif
572
Arnaldo Carvalho de Melo67e6b622005-09-16 16:58:40 -0700573static int dccp_getsockopt_service(struct sock *sk, int len,
Andrea Bittau60fe62e2006-03-20 19:23:32 -0800574 __be32 __user *optval,
Arnaldo Carvalho de Melo67e6b622005-09-16 16:58:40 -0700575 int __user *optlen)
576{
577 const struct dccp_sock *dp = dccp_sk(sk);
578 const struct dccp_service_list *sl;
579 int err = -ENOENT, slen = 0, total_len = sizeof(u32);
580
581 lock_sock(sk);
Arnaldo Carvalho de Melo67e6b622005-09-16 16:58:40 -0700582 if ((sl = dp->dccps_service_list) != NULL) {
583 slen = sl->dccpsl_nr * sizeof(u32);
584 total_len += slen;
585 }
586
587 err = -EINVAL;
588 if (total_len > len)
589 goto out;
590
591 err = 0;
592 if (put_user(total_len, optlen) ||
593 put_user(dp->dccps_service, optval) ||
594 (sl != NULL && copy_to_user(optval + 1, sl->dccpsl_list, slen)))
595 err = -EFAULT;
596out:
597 release_sock(sk);
598 return err;
599}
600
Dmitry Mishin3fdadf72006-03-20 22:45:21 -0800601static int do_dccp_getsockopt(struct sock *sk, int level, int optname,
Arnaldo Carvalho de Meloa1d3a352005-08-13 22:42:25 -0300602 char __user *optval, int __user *optlen)
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700603{
Arnaldo Carvalho de Meloa84ffe42005-08-28 04:51:32 -0300604 struct dccp_sock *dp;
605 int val, len;
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700606
Arnaldo Carvalho de Meloa84ffe42005-08-28 04:51:32 -0300607 if (get_user(len, optlen))
608 return -EFAULT;
609
Arnaldo Carvalho de Melo39ebc022007-03-28 11:54:32 -0700610 if (len < (int)sizeof(int))
Arnaldo Carvalho de Meloa84ffe42005-08-28 04:51:32 -0300611 return -EINVAL;
612
613 dp = dccp_sk(sk);
614
615 switch (optname) {
616 case DCCP_SOCKOPT_PACKET_SIZE:
Gerrit Renker5aed3242006-11-28 19:33:36 -0200617 DCCP_WARN("sockopt(PACKET_SIZE) is deprecated: fix your app\n");
Arnaldo Carvalho de Melo841bac12006-11-28 19:42:03 -0200618 return 0;
Arnaldo Carvalho de Melo88f964d2005-09-18 00:19:32 -0700619 case DCCP_SOCKOPT_SERVICE:
620 return dccp_getsockopt_service(sk, len,
Andrea Bittau60fe62e2006-03-20 19:23:32 -0800621 (__be32 __user *)optval, optlen);
Gerrit Renker7c559a92007-10-04 14:39:22 -0700622 case DCCP_SOCKOPT_GET_CUR_MPS:
623 val = dp->dccps_mss_cache;
Gerrit Renker7c559a92007-10-04 14:39:22 -0700624 break;
Gerrit Renkerd90ebcb2008-11-12 00:47:26 -0800625 case DCCP_SOCKOPT_AVAILABLE_CCIDS:
626 return ccid_getsockopt_builtin_ccids(sk, len, optval, optlen);
Gerrit Renker71c262a2008-11-23 16:04:59 -0800627 case DCCP_SOCKOPT_TX_CCID:
628 val = ccid_get_current_tx_ccid(dp);
629 if (val < 0)
630 return -ENOPROTOOPT;
631 break;
632 case DCCP_SOCKOPT_RX_CCID:
633 val = ccid_get_current_rx_ccid(dp);
634 if (val < 0)
635 return -ENOPROTOOPT;
636 break;
Gerrit Renkerb8599d22007-12-13 12:25:01 -0200637 case DCCP_SOCKOPT_SERVER_TIMEWAIT:
638 val = dp->dccps_server_timewait;
Gerrit Renkerb8599d22007-12-13 12:25:01 -0200639 break;
Gerrit Renker6f4e5ff2006-11-10 17:43:06 -0200640 case DCCP_SOCKOPT_SEND_CSCOV:
641 val = dp->dccps_pcslen;
642 break;
643 case DCCP_SOCKOPT_RECV_CSCOV:
644 val = dp->dccps_pcrlen;
645 break;
Arnaldo Carvalho de Melo88f964d2005-09-18 00:19:32 -0700646 case 128 ... 191:
647 return ccid_hc_rx_getsockopt(dp->dccps_hc_rx_ccid, sk, optname,
648 len, (u32 __user *)optval, optlen);
649 case 192 ... 255:
650 return ccid_hc_tx_getsockopt(dp->dccps_hc_tx_ccid, sk, optname,
651 len, (u32 __user *)optval, optlen);
Arnaldo Carvalho de Meloa84ffe42005-08-28 04:51:32 -0300652 default:
653 return -ENOPROTOOPT;
654 }
655
Gerrit Renker79133502007-12-13 12:27:14 -0200656 len = sizeof(val);
Arnaldo Carvalho de Meloa84ffe42005-08-28 04:51:32 -0300657 if (put_user(len, optlen) || copy_to_user(optval, &val, len))
658 return -EFAULT;
659
660 return 0;
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700661}
662
Dmitry Mishin3fdadf72006-03-20 22:45:21 -0800663int dccp_getsockopt(struct sock *sk, int level, int optname,
664 char __user *optval, int __user *optlen)
665{
666 if (level != SOL_DCCP)
667 return inet_csk(sk)->icsk_af_ops->getsockopt(sk, level,
668 optname, optval,
669 optlen);
670 return do_dccp_getsockopt(sk, level, optname, optval, optlen);
671}
Arnaldo Carvalho de Melo543d9cf2006-03-20 22:48:35 -0800672
Arnaldo Carvalho de Melof21e68c2005-12-13 23:24:16 -0800673EXPORT_SYMBOL_GPL(dccp_getsockopt);
674
Dmitry Mishin3fdadf72006-03-20 22:45:21 -0800675#ifdef CONFIG_COMPAT
676int compat_dccp_getsockopt(struct sock *sk, int level, int optname,
Arnaldo Carvalho de Melo543d9cf2006-03-20 22:48:35 -0800677 char __user *optval, int __user *optlen)
Dmitry Mishin3fdadf72006-03-20 22:45:21 -0800678{
Arnaldo Carvalho de Melodec73ff2006-03-20 22:46:16 -0800679 if (level != SOL_DCCP)
680 return inet_csk_compat_getsockopt(sk, level, optname,
681 optval, optlen);
Dmitry Mishin3fdadf72006-03-20 22:45:21 -0800682 return do_dccp_getsockopt(sk, level, optname, optval, optlen);
683}
Arnaldo Carvalho de Melo543d9cf2006-03-20 22:48:35 -0800684
Dmitry Mishin3fdadf72006-03-20 22:45:21 -0800685EXPORT_SYMBOL_GPL(compat_dccp_getsockopt);
686#endif
687
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700688int dccp_sendmsg(struct kiocb *iocb, struct sock *sk, struct msghdr *msg,
689 size_t len)
690{
691 const struct dccp_sock *dp = dccp_sk(sk);
692 const int flags = msg->msg_flags;
693 const int noblock = flags & MSG_DONTWAIT;
694 struct sk_buff *skb;
695 int rc, size;
696 long timeo;
697
698 if (len > dp->dccps_mss_cache)
699 return -EMSGSIZE;
700
701 lock_sock(sk);
Ian McDonaldb1308dc2006-11-20 18:30:17 -0200702
Gerrit Renker410e27a2008-09-09 13:27:22 +0200703 if (sysctl_dccp_tx_qlen &&
704 (sk->sk_write_queue.qlen >= sysctl_dccp_tx_qlen)) {
Ian McDonaldb1308dc2006-11-20 18:30:17 -0200705 rc = -EAGAIN;
706 goto out_release;
707 }
708
Arnaldo Carvalho de Melo27258ee2005-08-09 20:30:56 -0700709 timeo = sock_sndtimeo(sk, noblock);
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700710
711 /*
712 * We have to use sk_stream_wait_connect here to set sk_write_pending,
713 * so that the trick in dccp_rcv_request_sent_state_process.
714 */
715 /* Wait for a connection to finish. */
Gerrit Renkercecd8d02007-09-26 19:36:08 -0300716 if ((1 << sk->sk_state) & ~(DCCPF_OPEN | DCCPF_PARTOPEN))
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700717 if ((rc = sk_stream_wait_connect(sk, &timeo)) != 0)
Arnaldo Carvalho de Melo27258ee2005-08-09 20:30:56 -0700718 goto out_release;
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700719
720 size = sk->sk_prot->max_header + len;
721 release_sock(sk);
722 skb = sock_alloc_send_skb(sk, size, noblock, &rc);
723 lock_sock(sk);
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700724 if (skb == NULL)
725 goto out_release;
726
727 skb_reserve(skb, sk->sk_prot->max_header);
728 rc = memcpy_fromiovec(skb_put(skb, len), msg->msg_iov, len);
Arnaldo Carvalho de Melo27258ee2005-08-09 20:30:56 -0700729 if (rc != 0)
730 goto out_discard;
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700731
Gerrit Renker410e27a2008-09-09 13:27:22 +0200732 skb_queue_tail(&sk->sk_write_queue, skb);
733 dccp_write_xmit(sk,0);
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700734out_release:
735 release_sock(sk);
736 return rc ? : len;
Arnaldo Carvalho de Melo27258ee2005-08-09 20:30:56 -0700737out_discard:
738 kfree_skb(skb);
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700739 goto out_release;
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700740}
741
Arnaldo Carvalho de Melof21e68c2005-12-13 23:24:16 -0800742EXPORT_SYMBOL_GPL(dccp_sendmsg);
743
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700744int dccp_recvmsg(struct kiocb *iocb, struct sock *sk, struct msghdr *msg,
745 size_t len, int nonblock, int flags, int *addr_len)
746{
747 const struct dccp_hdr *dh;
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700748 long timeo;
749
750 lock_sock(sk);
751
Arnaldo Carvalho de Melo531669a2005-08-13 20:35:17 -0300752 if (sk->sk_state == DCCP_LISTEN) {
753 len = -ENOTCONN;
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700754 goto out;
Arnaldo Carvalho de Melo531669a2005-08-13 20:35:17 -0300755 }
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700756
757 timeo = sock_rcvtimeo(sk, nonblock);
758
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700759 do {
Arnaldo Carvalho de Melo531669a2005-08-13 20:35:17 -0300760 struct sk_buff *skb = skb_peek(&sk->sk_receive_queue);
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700761
Arnaldo Carvalho de Melo531669a2005-08-13 20:35:17 -0300762 if (skb == NULL)
763 goto verify_sock_status;
764
765 dh = dccp_hdr(skb);
766
Gerrit Renker0c869622007-11-28 11:59:48 -0200767 switch (dh->dccph_type) {
768 case DCCP_PKT_DATA:
769 case DCCP_PKT_DATAACK:
Arnaldo Carvalho de Melo531669a2005-08-13 20:35:17 -0300770 goto found_ok_skb;
771
Gerrit Renker0c869622007-11-28 11:59:48 -0200772 case DCCP_PKT_CLOSE:
773 case DCCP_PKT_CLOSEREQ:
774 if (!(flags & MSG_PEEK))
775 dccp_finish_passive_close(sk);
776 /* fall through */
777 case DCCP_PKT_RESET:
778 dccp_pr_debug("found fin (%s) ok!\n",
779 dccp_packet_name(dh->dccph_type));
Arnaldo Carvalho de Melo531669a2005-08-13 20:35:17 -0300780 len = 0;
781 goto found_fin_ok;
Gerrit Renker0c869622007-11-28 11:59:48 -0200782 default:
783 dccp_pr_debug("packet_type=%s\n",
784 dccp_packet_name(dh->dccph_type));
785 sk_eat_skb(sk, skb, 0);
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700786 }
Arnaldo Carvalho de Melo531669a2005-08-13 20:35:17 -0300787verify_sock_status:
788 if (sock_flag(sk, SOCK_DONE)) {
789 len = 0;
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700790 break;
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700791 }
792
Arnaldo Carvalho de Melo531669a2005-08-13 20:35:17 -0300793 if (sk->sk_err) {
794 len = sock_error(sk);
795 break;
796 }
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700797
Arnaldo Carvalho de Melo531669a2005-08-13 20:35:17 -0300798 if (sk->sk_shutdown & RCV_SHUTDOWN) {
799 len = 0;
800 break;
801 }
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700802
Arnaldo Carvalho de Melo531669a2005-08-13 20:35:17 -0300803 if (sk->sk_state == DCCP_CLOSED) {
804 if (!sock_flag(sk, SOCK_DONE)) {
805 /* This occurs when user tries to read
806 * from never connected socket.
807 */
808 len = -ENOTCONN;
809 break;
810 }
811 len = 0;
812 break;
813 }
814
815 if (!timeo) {
816 len = -EAGAIN;
817 break;
818 }
819
820 if (signal_pending(current)) {
821 len = sock_intr_errno(timeo);
822 break;
823 }
824
825 sk_wait_data(sk, &timeo);
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700826 continue;
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700827 found_ok_skb:
Arnaldo Carvalho de Melo531669a2005-08-13 20:35:17 -0300828 if (len > skb->len)
829 len = skb->len;
830 else if (len < skb->len)
831 msg->msg_flags |= MSG_TRUNC;
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700832
Arnaldo Carvalho de Melo531669a2005-08-13 20:35:17 -0300833 if (skb_copy_datagram_iovec(skb, 0, msg->msg_iov, len)) {
834 /* Exception. Bailout! */
835 len = -EFAULT;
836 break;
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700837 }
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700838 found_fin_ok:
839 if (!(flags & MSG_PEEK))
Chris Leech624d1162006-05-23 18:01:28 -0700840 sk_eat_skb(sk, skb, 0);
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700841 break;
Arnaldo Carvalho de Melo531669a2005-08-13 20:35:17 -0300842 } while (1);
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700843out:
844 release_sock(sk);
Arnaldo Carvalho de Melo531669a2005-08-13 20:35:17 -0300845 return len;
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700846}
847
Arnaldo Carvalho de Melof21e68c2005-12-13 23:24:16 -0800848EXPORT_SYMBOL_GPL(dccp_recvmsg);
849
850int inet_dccp_listen(struct socket *sock, int backlog)
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700851{
852 struct sock *sk = sock->sk;
853 unsigned char old_state;
854 int err;
855
856 lock_sock(sk);
857
858 err = -EINVAL;
859 if (sock->state != SS_UNCONNECTED || sock->type != SOCK_DCCP)
860 goto out;
861
862 old_state = sk->sk_state;
863 if (!((1 << old_state) & (DCCPF_CLOSED | DCCPF_LISTEN)))
864 goto out;
865
866 /* Really, if the socket is already in listen state
867 * we can only allow the backlog to be adjusted.
868 */
869 if (old_state != DCCP_LISTEN) {
870 /*
871 * FIXME: here it probably should be sk->sk_prot->listen_start
872 * see tcp_listen_start
873 */
Eric Dumazet72a3eff2006-11-16 02:30:37 -0800874 err = dccp_listen_start(sk, backlog);
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700875 if (err)
876 goto out;
877 }
878 sk->sk_max_ack_backlog = backlog;
879 err = 0;
880
881out:
882 release_sock(sk);
883 return err;
884}
885
Arnaldo Carvalho de Melof21e68c2005-12-13 23:24:16 -0800886EXPORT_SYMBOL_GPL(inet_dccp_listen);
887
Gerrit Renker0c869622007-11-28 11:59:48 -0200888static void dccp_terminate_connection(struct sock *sk)
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700889{
Gerrit Renker0c869622007-11-28 11:59:48 -0200890 u8 next_state = DCCP_CLOSED;
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700891
Gerrit Renker0c869622007-11-28 11:59:48 -0200892 switch (sk->sk_state) {
893 case DCCP_PASSIVE_CLOSE:
894 case DCCP_PASSIVE_CLOSEREQ:
895 dccp_finish_passive_close(sk);
896 break;
897 case DCCP_PARTOPEN:
898 dccp_pr_debug("Stop PARTOPEN timer (%p)\n", sk);
899 inet_csk_clear_xmit_timer(sk, ICSK_TIME_DACK);
900 /* fall through */
901 case DCCP_OPEN:
902 dccp_send_close(sk, 1);
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700903
Gerrit Renkerb8599d22007-12-13 12:25:01 -0200904 if (dccp_sk(sk)->dccps_role == DCCP_ROLE_SERVER &&
905 !dccp_sk(sk)->dccps_server_timewait)
Gerrit Renker0c869622007-11-28 11:59:48 -0200906 next_state = DCCP_ACTIVE_CLOSEREQ;
907 else
908 next_state = DCCP_CLOSING;
909 /* fall through */
910 default:
911 dccp_set_state(sk, next_state);
912 }
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700913}
914
915void dccp_close(struct sock *sk, long timeout)
916{
Ian McDonald97e58482006-08-26 19:16:45 -0700917 struct dccp_sock *dp = dccp_sk(sk);
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700918 struct sk_buff *skb;
Gerrit Renkerd83bd952007-12-16 16:06:03 -0800919 u32 data_was_unread = 0;
Herbert Xu134af342006-05-05 17:09:13 -0700920 int state;
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700921
922 lock_sock(sk);
923
924 sk->sk_shutdown = SHUTDOWN_MASK;
925
926 if (sk->sk_state == DCCP_LISTEN) {
927 dccp_set_state(sk, DCCP_CLOSED);
928
929 /* Special case. */
930 inet_csk_listen_stop(sk);
931
932 goto adjudge_to_death;
933 }
934
Ian McDonald97e58482006-08-26 19:16:45 -0700935 sk_stop_timer(sk, &dp->dccps_xmit_timer);
936
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700937 /*
938 * We need to flush the recv. buffs. We do this only on the
939 * descriptor close, not protocol-sourced closes, because the
940 *reader process may not have drained the data yet!
941 */
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700942 while ((skb = __skb_dequeue(&sk->sk_receive_queue)) != NULL) {
Gerrit Renkerd83bd952007-12-16 16:06:03 -0800943 data_was_unread += skb->len;
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700944 __kfree_skb(skb);
945 }
946
Gerrit Renkerd83bd952007-12-16 16:06:03 -0800947 if (data_was_unread) {
948 /* Unread data was tossed, send an appropriate Reset Code */
949 DCCP_WARN("DCCP: ABORT -- %u bytes unread\n", data_was_unread);
950 dccp_send_reset(sk, DCCP_RESET_CODE_ABORTED);
951 dccp_set_state(sk, DCCP_CLOSED);
952 } else if (sock_flag(sk, SOCK_LINGER) && !sk->sk_lingertime) {
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700953 /* Check zero linger _after_ checking for unread data. */
954 sk->sk_prot->disconnect(sk, 0);
Gerrit Renker0c869622007-11-28 11:59:48 -0200955 } else if (sk->sk_state != DCCP_CLOSED) {
956 dccp_terminate_connection(sk);
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700957 }
958
959 sk_stream_wait_close(sk, timeout);
960
961adjudge_to_death:
Herbert Xu134af342006-05-05 17:09:13 -0700962 state = sk->sk_state;
963 sock_hold(sk);
964 sock_orphan(sk);
Herbert Xu134af342006-05-05 17:09:13 -0700965
Arnaldo Carvalho de Melo7ad07e72005-08-23 21:50:06 -0700966 /*
967 * It is the last release_sock in its life. It will remove backlog.
968 */
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700969 release_sock(sk);
970 /*
971 * Now socket is owned by kernel and we acquire BH lock
972 * to finish close. No need to check for user refs.
973 */
974 local_bh_disable();
975 bh_lock_sock(sk);
Ilpo Järvinen547b7922008-07-25 21:43:18 -0700976 WARN_ON(sock_owned_by_user(sk));
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700977
Herbert Xueb4dea52008-12-29 23:04:08 -0800978 percpu_counter_inc(sk->sk_prot->orphan_count);
979
Herbert Xu134af342006-05-05 17:09:13 -0700980 /* Have we already been destroyed by a softirq or backlog? */
981 if (state != DCCP_CLOSED && sk->sk_state == DCCP_CLOSED)
982 goto out;
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700983
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700984 if (sk->sk_state == DCCP_CLOSED)
985 inet_csk_destroy_sock(sk);
986
987 /* Otherwise, socket is reprieved until protocol close. */
988
Herbert Xu134af342006-05-05 17:09:13 -0700989out:
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700990 bh_unlock_sock(sk);
991 local_bh_enable();
992 sock_put(sk);
993}
994
Arnaldo Carvalho de Melof21e68c2005-12-13 23:24:16 -0800995EXPORT_SYMBOL_GPL(dccp_close);
996
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -0700997void dccp_shutdown(struct sock *sk, int how)
998{
Gerrit Renker8e8c71f2007-11-21 09:56:48 -0200999 dccp_pr_debug("called shutdown(%x)\n", how);
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -07001000}
1001
Arnaldo Carvalho de Melof21e68c2005-12-13 23:24:16 -08001002EXPORT_SYMBOL_GPL(dccp_shutdown);
1003
YOSHIFUJI Hideaki24e8b7e2008-04-10 03:48:43 -07001004static inline int dccp_mib_init(void)
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -07001005{
YOSHIFUJI Hideaki24e8b7e2008-04-10 03:48:43 -07001006 return snmp_mib_init((void**)dccp_statistics, sizeof(struct dccp_mib));
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -07001007}
1008
YOSHIFUJI Hideaki24e8b7e2008-04-10 03:48:43 -07001009static inline void dccp_mib_exit(void)
Arnaldo Carvalho de Melo46f09ff2006-03-20 21:24:42 -08001010{
YOSHIFUJI Hideaki24e8b7e2008-04-10 03:48:43 -07001011 snmp_mib_free((void**)dccp_statistics);
Arnaldo Carvalho de Melo46f09ff2006-03-20 21:24:42 -08001012}
1013
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -07001014static int thash_entries;
1015module_param(thash_entries, int, 0444);
1016MODULE_PARM_DESC(thash_entries, "Number of ehash buckets");
1017
Arnaldo Carvalho de Meloa1d3a352005-08-13 22:42:25 -03001018#ifdef CONFIG_IP_DCCP_DEBUG
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -07001019int dccp_debug;
Gerrit Renker43264992008-08-23 13:28:27 +02001020module_param(dccp_debug, bool, 0644);
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -07001021MODULE_PARM_DESC(dccp_debug, "Enable debug messages");
Arnaldo Carvalho de Melof21e68c2005-12-13 23:24:16 -08001022
1023EXPORT_SYMBOL_GPL(dccp_debug);
Arnaldo Carvalho de Meloa1d3a352005-08-13 22:42:25 -03001024#endif
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -07001025
1026static int __init dccp_init(void)
1027{
1028 unsigned long goal;
1029 int ehash_order, bhash_order, i;
Eric Dumazetdd24c002008-11-25 21:17:14 -08001030 int rc;
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -07001031
Patrick McHardy028b0272008-04-12 18:35:41 -07001032 BUILD_BUG_ON(sizeof(struct dccp_skb_cb) >
1033 FIELD_SIZEOF(struct sk_buff, cb));
Eric Dumazetdd24c002008-11-25 21:17:14 -08001034 rc = percpu_counter_init(&dccp_orphan_count, 0);
1035 if (rc)
1036 goto out;
1037 rc = -ENOBUFS;
Eric Dumazet5caea4e2008-11-20 00:40:07 -08001038 inet_hashinfo_init(&dccp_hashinfo);
Arnaldo Carvalho de Melo7690af32005-08-13 20:34:54 -03001039 dccp_hashinfo.bind_bucket_cachep =
1040 kmem_cache_create("dccp_bind_bucket",
1041 sizeof(struct inet_bind_bucket), 0,
Paul Mundt20c2df82007-07-20 10:11:58 +09001042 SLAB_HWCACHE_ALIGN, NULL);
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -07001043 if (!dccp_hashinfo.bind_bucket_cachep)
Eric Dumazetdd24c002008-11-25 21:17:14 -08001044 goto out_free_percpu;
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -07001045
1046 /*
1047 * Size and allocate the main established and bind bucket
1048 * hash tables.
1049 *
1050 * The methodology is similar to that of the buffer cache.
1051 */
1052 if (num_physpages >= (128 * 1024))
1053 goal = num_physpages >> (21 - PAGE_SHIFT);
1054 else
1055 goal = num_physpages >> (23 - PAGE_SHIFT);
1056
1057 if (thash_entries)
Arnaldo Carvalho de Melo7690af32005-08-13 20:34:54 -03001058 goal = (thash_entries *
1059 sizeof(struct inet_ehash_bucket)) >> PAGE_SHIFT;
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -07001060 for (ehash_order = 0; (1UL << ehash_order) < goal; ehash_order++)
1061 ;
1062 do {
1063 dccp_hashinfo.ehash_size = (1UL << ehash_order) * PAGE_SIZE /
1064 sizeof(struct inet_ehash_bucket);
Arnaldo Carvalho de Melo7690af32005-08-13 20:34:54 -03001065 while (dccp_hashinfo.ehash_size &
1066 (dccp_hashinfo.ehash_size - 1))
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -07001067 dccp_hashinfo.ehash_size--;
1068 dccp_hashinfo.ehash = (struct inet_ehash_bucket *)
1069 __get_free_pages(GFP_ATOMIC, ehash_order);
1070 } while (!dccp_hashinfo.ehash && --ehash_order > 0);
1071
1072 if (!dccp_hashinfo.ehash) {
Gerrit Renker59348b12006-11-20 18:39:23 -02001073 DCCP_CRIT("Failed to allocate DCCP established hash table");
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -07001074 goto out_free_bind_bucket_cachep;
1075 }
1076
Eric Dumazetdbca9b2752007-02-08 14:16:46 -08001077 for (i = 0; i < dccp_hashinfo.ehash_size; i++) {
Eric Dumazet3ab5aee2008-11-16 19:40:17 -08001078 INIT_HLIST_NULLS_HEAD(&dccp_hashinfo.ehash[i].chain, i);
1079 INIT_HLIST_NULLS_HEAD(&dccp_hashinfo.ehash[i].twchain, i);
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -07001080 }
1081
Eric Dumazet230140c2007-11-07 02:40:20 -08001082 if (inet_ehash_locks_alloc(&dccp_hashinfo))
1083 goto out_free_dccp_ehash;
1084
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -07001085 bhash_order = ehash_order;
1086
1087 do {
1088 dccp_hashinfo.bhash_size = (1UL << bhash_order) * PAGE_SIZE /
1089 sizeof(struct inet_bind_hashbucket);
Arnaldo Carvalho de Melo7690af32005-08-13 20:34:54 -03001090 if ((dccp_hashinfo.bhash_size > (64 * 1024)) &&
1091 bhash_order > 0)
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -07001092 continue;
1093 dccp_hashinfo.bhash = (struct inet_bind_hashbucket *)
1094 __get_free_pages(GFP_ATOMIC, bhash_order);
1095 } while (!dccp_hashinfo.bhash && --bhash_order >= 0);
1096
1097 if (!dccp_hashinfo.bhash) {
Gerrit Renker59348b12006-11-20 18:39:23 -02001098 DCCP_CRIT("Failed to allocate DCCP bind hash table");
Eric Dumazet230140c2007-11-07 02:40:20 -08001099 goto out_free_dccp_locks;
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -07001100 }
1101
1102 for (i = 0; i < dccp_hashinfo.bhash_size; i++) {
1103 spin_lock_init(&dccp_hashinfo.bhash[i].lock);
1104 INIT_HLIST_HEAD(&dccp_hashinfo.bhash[i].chain);
1105 }
1106
Arnaldo Carvalho de Melo46f09ff2006-03-20 21:24:42 -08001107 rc = dccp_mib_init();
Arnaldo Carvalho de Melofa23e2e2006-03-20 17:16:01 -08001108 if (rc)
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -07001109 goto out_free_dccp_bhash;
1110
Arnaldo Carvalho de Melo9b07ef52006-03-20 17:16:17 -08001111 rc = dccp_ackvec_init();
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -07001112 if (rc)
Arnaldo Carvalho de Melob61fafc2006-03-20 21:25:11 -08001113 goto out_free_dccp_mib;
Arnaldo Carvalho de Melo9b07ef52006-03-20 17:16:17 -08001114
Arnaldo Carvalho de Meloe55d9122006-03-20 19:25:02 -08001115 rc = dccp_sysctl_init();
Arnaldo Carvalho de Melo9b07ef52006-03-20 17:16:17 -08001116 if (rc)
1117 goto out_ackvec_exit;
Gerrit Renker4c70f382007-09-25 22:40:13 -07001118
Gerrit Renkerddebc972009-01-04 21:42:53 -08001119 rc = ccid_initialize_builtins();
1120 if (rc)
1121 goto out_sysctl_exit;
1122
Gerrit Renker4c70f382007-09-25 22:40:13 -07001123 dccp_timestamping_init();
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -07001124out:
1125 return rc;
Gerrit Renkerddebc972009-01-04 21:42:53 -08001126out_sysctl_exit:
1127 dccp_sysctl_exit();
Arnaldo Carvalho de Melo9b07ef52006-03-20 17:16:17 -08001128out_ackvec_exit:
1129 dccp_ackvec_exit();
Arnaldo Carvalho de Melob61fafc2006-03-20 21:25:11 -08001130out_free_dccp_mib:
Arnaldo Carvalho de Melo46f09ff2006-03-20 21:24:42 -08001131 dccp_mib_exit();
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -07001132out_free_dccp_bhash:
1133 free_pages((unsigned long)dccp_hashinfo.bhash, bhash_order);
1134 dccp_hashinfo.bhash = NULL;
Eric Dumazet230140c2007-11-07 02:40:20 -08001135out_free_dccp_locks:
1136 inet_ehash_locks_free(&dccp_hashinfo);
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -07001137out_free_dccp_ehash:
1138 free_pages((unsigned long)dccp_hashinfo.ehash, ehash_order);
1139 dccp_hashinfo.ehash = NULL;
1140out_free_bind_bucket_cachep:
1141 kmem_cache_destroy(dccp_hashinfo.bind_bucket_cachep);
1142 dccp_hashinfo.bind_bucket_cachep = NULL;
Eric Dumazetdd24c002008-11-25 21:17:14 -08001143out_free_percpu:
1144 percpu_counter_destroy(&dccp_orphan_count);
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -07001145 goto out;
1146}
1147
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -07001148static void __exit dccp_fini(void)
1149{
Gerrit Renkerddebc972009-01-04 21:42:53 -08001150 ccid_cleanup_builtins();
Arnaldo Carvalho de Melo46f09ff2006-03-20 21:24:42 -08001151 dccp_mib_exit();
Arnaldo Carvalho de Melo725ba8e2005-08-13 20:35:39 -03001152 free_pages((unsigned long)dccp_hashinfo.bhash,
1153 get_order(dccp_hashinfo.bhash_size *
1154 sizeof(struct inet_bind_hashbucket)));
1155 free_pages((unsigned long)dccp_hashinfo.ehash,
1156 get_order(dccp_hashinfo.ehash_size *
1157 sizeof(struct inet_ehash_bucket)));
Eric Dumazet230140c2007-11-07 02:40:20 -08001158 inet_ehash_locks_free(&dccp_hashinfo);
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -07001159 kmem_cache_destroy(dccp_hashinfo.bind_bucket_cachep);
Arnaldo Carvalho de Melo9b07ef52006-03-20 17:16:17 -08001160 dccp_ackvec_exit();
Arnaldo Carvalho de Meloe55d9122006-03-20 19:25:02 -08001161 dccp_sysctl_exit();
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -07001162}
1163
1164module_init(dccp_init);
1165module_exit(dccp_fini);
1166
Arnaldo Carvalho de Melo7c657872005-08-09 20:14:34 -07001167MODULE_LICENSE("GPL");
1168MODULE_AUTHOR("Arnaldo Carvalho de Melo <acme@conectiva.com.br>");
1169MODULE_DESCRIPTION("DCCP - Datagram Congestion Controlled Protocol");