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solos: Set RX empty flag at startup only for !dma mode
[linux-2.6.git] / net / dccp / proto.c
blob945b4d5d23b3153fce6efd1fb0b3e04dee04b501
1 /*
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
12 #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
25 #include <net/inet_sock.h>
26 #include <net/sock.h>
27 #include <net/xfrm.h>
28
29 #include <asm/ioctls.h>
30 #include <linux/spinlock.h>
31 #include <linux/timer.h>
32 #include <linux/delay.h>
33 #include <linux/poll.h>
34
35 #include "ccid.h"
36 #include "dccp.h"
37 #include "feat.h"
38
39 DEFINE_SNMP_STAT(struct dccp_mib, dccp_statistics) __read_mostly;
40
41 EXPORT_SYMBOL_GPL(dccp_statistics);
42
43 struct percpu_counter dccp_orphan_count;
44 EXPORT_SYMBOL_GPL(dccp_orphan_count);
45
46 struct inet_hashinfo dccp_hashinfo;
47 EXPORT_SYMBOL_GPL(dccp_hashinfo);
48
49 /* the maximum queue length for tx in packets. 0 is no limit */
50 int sysctl_dccp_tx_qlen __read_mostly = 5;
51
52 void dccp_set_state(struct sock *sk, const int state)
53 {
54 const int oldstate = sk->sk_state;
55
56 dccp_pr_debug("%s(%p) %s --> %s\n", dccp_role(sk), sk,
57 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);
64 /* Client retransmits all Confirm options until entering OPEN */
65 if (oldstate == DCCP_PARTOPEN)
66 dccp_feat_list_purge(&dccp_sk(sk)->dccps_featneg);
67 break;
68
69 case DCCP_CLOSED:
70 if (oldstate == DCCP_OPEN || oldstate == DCCP_ACTIVE_CLOSEREQ ||
71 oldstate == DCCP_CLOSING)
72 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))
77 inet_put_port(sk);
78 /* 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
90 EXPORT_SYMBOL_GPL(dccp_set_state);
91
92 static 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
110 void 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
123 EXPORT_SYMBOL_GPL(dccp_done);
124
125 const 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
146 EXPORT_SYMBOL_GPL(dccp_packet_name);
147
148 const char *dccp_state_name(const int state)
149 {
150 static char *dccp_state_names[] = {
151 [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",
162 };
163
164 if (state >= DCCP_MAX_STATES)
165 return "INVALID STATE!";
166 else
167 return dccp_state_names[state];
168 }
169
170 EXPORT_SYMBOL_GPL(dccp_state_name);
171
172 int dccp_init_sock(struct sock *sk, const __u8 ctl_sock_initialized)
173 {
174 struct dccp_sock *dp = dccp_sk(sk);
175 struct inet_connection_sock *icsk = inet_csk(sk);
176
177 dccp_minisock_init(&dp->dccps_minisock);
178
179 icsk->icsk_rto = DCCP_TIMEOUT_INIT;
180 icsk->icsk_syn_retries = sysctl_dccp_request_retries;
181 sk->sk_state = DCCP_CLOSED;
182 sk->sk_write_space = dccp_write_space;
183 icsk->icsk_sync_mss = dccp_sync_mss;
184 dp->dccps_mss_cache = 536;
185 dp->dccps_rate_last = jiffies;
186 dp->dccps_role = DCCP_ROLE_UNDEFINED;
187 dp->dccps_service = DCCP_SERVICE_CODE_IS_ABSENT;
188 dp->dccps_l_ack_ratio = dp->dccps_r_ack_ratio = 1;
189
190 dccp_init_xmit_timers(sk);
191
192 INIT_LIST_HEAD(&dp->dccps_featneg);
193 /* control socket doesn't need feat nego */
194 if (likely(ctl_sock_initialized))
195 return dccp_feat_init(sk);
196 return 0;
197 }
198
199 EXPORT_SYMBOL_GPL(dccp_init_sock);
200
201 void dccp_destroy_sock(struct sock *sk)
202 {
203 struct dccp_sock *dp = dccp_sk(sk);
204
205 /*
206 * DCCP doesn't use sk_write_queue, just sk_send_head
207 * for retransmissions
208 */
209 if (sk->sk_send_head != NULL) {
210 kfree_skb(sk->sk_send_head);
211 sk->sk_send_head = NULL;
212 }
213
214 /* Clean up a referenced DCCP bind bucket. */
215 if (inet_csk(sk)->icsk_bind_hash != NULL)
216 inet_put_port(sk);
217
218 kfree(dp->dccps_service_list);
219 dp->dccps_service_list = NULL;
220
221 if (dp->dccps_hc_rx_ackvec != NULL) {
222 dccp_ackvec_free(dp->dccps_hc_rx_ackvec);
223 dp->dccps_hc_rx_ackvec = NULL;
224 }
225 ccid_hc_rx_delete(dp->dccps_hc_rx_ccid, sk);
226 ccid_hc_tx_delete(dp->dccps_hc_tx_ccid, sk);
227 dp->dccps_hc_rx_ccid = dp->dccps_hc_tx_ccid = NULL;
228
229 /* clean up feature negotiation state */
230 dccp_feat_list_purge(&dp->dccps_featneg);
231 }
232
233 EXPORT_SYMBOL_GPL(dccp_destroy_sock);
234
235 static inline int dccp_listen_start(struct sock *sk, int backlog)
236 {
237 struct dccp_sock *dp = dccp_sk(sk);
238
239 dp->dccps_role = DCCP_ROLE_LISTEN;
240 /* do not start to listen if feature negotiation setup fails */
241 if (dccp_feat_finalise_settings(dp))
242 return -EPROTO;
243 return inet_csk_listen_start(sk, backlog);
244 }
245
246 static inline int dccp_need_reset(int state)
247 {
248 return state != DCCP_CLOSED && state != DCCP_LISTEN &&
249 state != DCCP_REQUESTING;
250 }
251
252 int dccp_disconnect(struct sock *sk, int flags)
253 {
254 struct inet_connection_sock *icsk = inet_csk(sk);
255 struct inet_sock *inet = inet_sk(sk);
256 int err = 0;
257 const int old_state = sk->sk_state;
258
259 if (old_state != DCCP_CLOSED)
260 dccp_set_state(sk, DCCP_CLOSED);
261
262 /*
263 * This corresponds to the ABORT function of RFC793, sec. 3.8
264 * TCP uses a RST segment, DCCP a Reset packet with Code 2, "Aborted".
265 */
266 if (old_state == DCCP_LISTEN) {
267 inet_csk_listen_stop(sk);
268 } else if (dccp_need_reset(old_state)) {
269 dccp_send_reset(sk, DCCP_RESET_CODE_ABORTED);
270 sk->sk_err = ECONNRESET;
271 } else if (old_state == DCCP_REQUESTING)
272 sk->sk_err = ECONNRESET;
273
274 dccp_clear_xmit_timers(sk);
275
276 __skb_queue_purge(&sk->sk_receive_queue);
277 __skb_queue_purge(&sk->sk_write_queue);
278 if (sk->sk_send_head != NULL) {
279 __kfree_skb(sk->sk_send_head);
280 sk->sk_send_head = NULL;
281 }
282
283 inet->dport = 0;
284
285 if (!(sk->sk_userlocks & SOCK_BINDADDR_LOCK))
286 inet_reset_saddr(sk);
287
288 sk->sk_shutdown = 0;
289 sock_reset_flag(sk, SOCK_DONE);
290
291 icsk->icsk_backoff = 0;
292 inet_csk_delack_init(sk);
293 __sk_dst_reset(sk);
294
295 WARN_ON(inet->num && !icsk->icsk_bind_hash);
296
297 sk->sk_error_report(sk);
298 return err;
299 }
300
301 EXPORT_SYMBOL_GPL(dccp_disconnect);
302
303 /*
304 * Wait for a DCCP event.
305 *
306 * Note that we don't need to lock the socket, as the upper poll layers
307 * take care of normal races (between the test and the event) and we don't
308 * go look at any of the socket buffers directly.
309 */
310 unsigned int dccp_poll(struct file *file, struct socket *sock,
311 poll_table *wait)
312 {
313 unsigned int mask;
314 struct sock *sk = sock->sk;
315
316 poll_wait(file, sk->sk_sleep, wait);
317 if (sk->sk_state == DCCP_LISTEN)
318 return inet_csk_listen_poll(sk);
319
320 /* Socket is not locked. We are protected from async events
321 by poll logic and correct handling of state changes
322 made by another threads is impossible in any case.
323 */
324
325 mask = 0;
326 if (sk->sk_err)
327 mask = POLLERR;
328
329 if (sk->sk_shutdown == SHUTDOWN_MASK || sk->sk_state == DCCP_CLOSED)
330 mask |= POLLHUP;
331 if (sk->sk_shutdown & RCV_SHUTDOWN)
332 mask |= POLLIN | POLLRDNORM | POLLRDHUP;
333
334 /* Connected? */
335 if ((1 << sk->sk_state) & ~(DCCPF_REQUESTING | DCCPF_RESPOND)) {
336 if (atomic_read(&sk->sk_rmem_alloc) > 0)
337 mask |= POLLIN | POLLRDNORM;
338
339 if (!(sk->sk_shutdown & SEND_SHUTDOWN)) {
340 if (sk_stream_wspace(sk) >= sk_stream_min_wspace(sk)) {
341 mask |= POLLOUT | POLLWRNORM;
342 } else { /* send SIGIO later */
343 set_bit(SOCK_ASYNC_NOSPACE,
344 &sk->sk_socket->flags);
345 set_bit(SOCK_NOSPACE, &sk->sk_socket->flags);
346
347 /* Race breaker. If space is freed after
348 * wspace test but before the flags are set,
349 * IO signal will be lost.
350 */
351 if (sk_stream_wspace(sk) >= sk_stream_min_wspace(sk))
352 mask |= POLLOUT | POLLWRNORM;
353 }
354 }
355 }
356 return mask;
357 }
358
359 EXPORT_SYMBOL_GPL(dccp_poll);
360
361 int dccp_ioctl(struct sock *sk, int cmd, unsigned long arg)
362 {
363 int rc = -ENOTCONN;
364
365 lock_sock(sk);
366
367 if (sk->sk_state == DCCP_LISTEN)
368 goto out;
369
370 switch (cmd) {
371 case SIOCINQ: {
372 struct sk_buff *skb;
373 unsigned long amount = 0;
374
375 skb = skb_peek(&sk->sk_receive_queue);
376 if (skb != NULL) {
377 /*
378 * We will only return the amount of this packet since
379 * that is all that will be read.
380 */
381 amount = skb->len;
382 }
383 rc = put_user(amount, (int __user *)arg);
384 }
385 break;
386 default:
387 rc = -ENOIOCTLCMD;
388 break;
389 }
390 out:
391 release_sock(sk);
392 return rc;
393 }
394
395 EXPORT_SYMBOL_GPL(dccp_ioctl);
396
397 static int dccp_setsockopt_service(struct sock *sk, const __be32 service,
398 char __user *optval, int optlen)
399 {
400 struct dccp_sock *dp = dccp_sk(sk);
401 struct dccp_service_list *sl = NULL;
402
403 if (service == DCCP_SERVICE_INVALID_VALUE ||
404 optlen > DCCP_SERVICE_LIST_MAX_LEN * sizeof(u32))
405 return -EINVAL;
406
407 if (optlen > sizeof(service)) {
408 sl = kmalloc(optlen, GFP_KERNEL);
409 if (sl == NULL)
410 return -ENOMEM;
411
412 sl->dccpsl_nr = optlen / sizeof(u32) - 1;
413 if (copy_from_user(sl->dccpsl_list,
414 optval + sizeof(service),
415 optlen - sizeof(service)) ||
416 dccp_list_has_service(sl, DCCP_SERVICE_INVALID_VALUE)) {
417 kfree(sl);
418 return -EFAULT;
419 }
420 }
421
422 lock_sock(sk);
423 dp->dccps_service = service;
424
425 kfree(dp->dccps_service_list);
426
427 dp->dccps_service_list = sl;
428 release_sock(sk);
429 return 0;
430 }
431
432 static int dccp_setsockopt_cscov(struct sock *sk, int cscov, bool rx)
433 {
434 u8 *list, len;
435 int i, rc;
436
437 if (cscov < 0 || cscov > 15)
438 return -EINVAL;
439 /*
440 * Populate a list of permissible values, in the range cscov...15. This
441 * is necessary since feature negotiation of single values only works if
442 * both sides incidentally choose the same value. Since the list starts
443 * lowest-value first, negotiation will pick the smallest shared value.
444 */
445 if (cscov == 0)
446 return 0;
447 len = 16 - cscov;
448
449 list = kmalloc(len, GFP_KERNEL);
450 if (list == NULL)
451 return -ENOBUFS;
452
453 for (i = 0; i < len; i++)
454 list[i] = cscov++;
455
456 rc = dccp_feat_register_sp(sk, DCCPF_MIN_CSUM_COVER, rx, list, len);
457
458 if (rc == 0) {
459 if (rx)
460 dccp_sk(sk)->dccps_pcrlen = cscov;
461 else
462 dccp_sk(sk)->dccps_pcslen = cscov;
463 }
464 kfree(list);
465 return rc;
466 }
467
468 static int dccp_setsockopt_ccid(struct sock *sk, int type,
469 char __user *optval, int optlen)
470 {
471 u8 *val;
472 int rc = 0;
473
474 if (optlen < 1 || optlen > DCCP_FEAT_MAX_SP_VALS)
475 return -EINVAL;
476
477 val = kmalloc(optlen, GFP_KERNEL);
478 if (val == NULL)
479 return -ENOMEM;
480
481 if (copy_from_user(val, optval, optlen)) {
482 kfree(val);
483 return -EFAULT;
484 }
485
486 lock_sock(sk);
487 if (type == DCCP_SOCKOPT_TX_CCID || type == DCCP_SOCKOPT_CCID)
488 rc = dccp_feat_register_sp(sk, DCCPF_CCID, 1, val, optlen);
489
490 if (!rc && (type == DCCP_SOCKOPT_RX_CCID || type == DCCP_SOCKOPT_CCID))
491 rc = dccp_feat_register_sp(sk, DCCPF_CCID, 0, val, optlen);
492 release_sock(sk);
493
494 kfree(val);
495 return rc;
496 }
497
498 static int do_dccp_setsockopt(struct sock *sk, int level, int optname,
499 char __user *optval, int optlen)
500 {
501 struct dccp_sock *dp = dccp_sk(sk);
502 int val, err = 0;
503
504 switch (optname) {
505 case DCCP_SOCKOPT_PACKET_SIZE:
506 DCCP_WARN("sockopt(PACKET_SIZE) is deprecated: fix your app\n");
507 return 0;
508 case DCCP_SOCKOPT_CHANGE_L:
509 case DCCP_SOCKOPT_CHANGE_R:
510 DCCP_WARN("sockopt(CHANGE_L/R) is deprecated: fix your app\n");
511 return 0;
512 case DCCP_SOCKOPT_CCID:
513 case DCCP_SOCKOPT_RX_CCID:
514 case DCCP_SOCKOPT_TX_CCID:
515 return dccp_setsockopt_ccid(sk, optname, optval, optlen);
516 }
517
518 if (optlen < (int)sizeof(int))
519 return -EINVAL;
520
521 if (get_user(val, (int __user *)optval))
522 return -EFAULT;
523
524 if (optname == DCCP_SOCKOPT_SERVICE)
525 return dccp_setsockopt_service(sk, val, optval, optlen);
526
527 lock_sock(sk);
528 switch (optname) {
529 case DCCP_SOCKOPT_SERVER_TIMEWAIT:
530 if (dp->dccps_role != DCCP_ROLE_SERVER)
531 err = -EOPNOTSUPP;
532 else
533 dp->dccps_server_timewait = (val != 0);
534 break;
535 case DCCP_SOCKOPT_SEND_CSCOV:
536 err = dccp_setsockopt_cscov(sk, val, false);
537 break;
538 case DCCP_SOCKOPT_RECV_CSCOV:
539 err = dccp_setsockopt_cscov(sk, val, true);
540 break;
541 default:
542 err = -ENOPROTOOPT;
543 break;
544 }
545 release_sock(sk);
546
547 return err;
548 }
549
550 int dccp_setsockopt(struct sock *sk, int level, int optname,
551 char __user *optval, int optlen)
552 {
553 if (level != SOL_DCCP)
554 return inet_csk(sk)->icsk_af_ops->setsockopt(sk, level,
555 optname, optval,
556 optlen);
557 return do_dccp_setsockopt(sk, level, optname, optval, optlen);
558 }
559
560 EXPORT_SYMBOL_GPL(dccp_setsockopt);
561
562 #ifdef CONFIG_COMPAT
563 int compat_dccp_setsockopt(struct sock *sk, int level, int optname,
564 char __user *optval, int optlen)
565 {
566 if (level != SOL_DCCP)
567 return inet_csk_compat_setsockopt(sk, level, optname,
568 optval, optlen);
569 return do_dccp_setsockopt(sk, level, optname, optval, optlen);
570 }
571
572 EXPORT_SYMBOL_GPL(compat_dccp_setsockopt);
573 #endif
574
575 static int dccp_getsockopt_service(struct sock *sk, int len,
576 __be32 __user *optval,
577 int __user *optlen)
578 {
579 const struct dccp_sock *dp = dccp_sk(sk);
580 const struct dccp_service_list *sl;
581 int err = -ENOENT, slen = 0, total_len = sizeof(u32);
582
583 lock_sock(sk);
584 if ((sl = dp->dccps_service_list) != NULL) {
585 slen = sl->dccpsl_nr * sizeof(u32);
586 total_len += slen;
587 }
588
589 err = -EINVAL;
590 if (total_len > len)
591 goto out;
592
593 err = 0;
594 if (put_user(total_len, optlen) ||
595 put_user(dp->dccps_service, optval) ||
596 (sl != NULL && copy_to_user(optval + 1, sl->dccpsl_list, slen)))
597 err = -EFAULT;
598 out:
599 release_sock(sk);
600 return err;
601 }
602
603 static int do_dccp_getsockopt(struct sock *sk, int level, int optname,
604 char __user *optval, int __user *optlen)
605 {
606 struct dccp_sock *dp;
607 int val, len;
608
609 if (get_user(len, optlen))
610 return -EFAULT;
611
612 if (len < (int)sizeof(int))
613 return -EINVAL;
614
615 dp = dccp_sk(sk);
616
617 switch (optname) {
618 case DCCP_SOCKOPT_PACKET_SIZE:
619 DCCP_WARN("sockopt(PACKET_SIZE) is deprecated: fix your app\n");
620 return 0;
621 case DCCP_SOCKOPT_SERVICE:
622 return dccp_getsockopt_service(sk, len,
623 (__be32 __user *)optval, optlen);
624 case DCCP_SOCKOPT_GET_CUR_MPS:
625 val = dp->dccps_mss_cache;
626 break;
627 case DCCP_SOCKOPT_AVAILABLE_CCIDS:
628 return ccid_getsockopt_builtin_ccids(sk, len, optval, optlen);
629 case DCCP_SOCKOPT_TX_CCID:
630 val = ccid_get_current_tx_ccid(dp);
631 if (val < 0)
632 return -ENOPROTOOPT;
633 break;
634 case DCCP_SOCKOPT_RX_CCID:
635 val = ccid_get_current_rx_ccid(dp);
636 if (val < 0)
637 return -ENOPROTOOPT;
638 break;
639 case DCCP_SOCKOPT_SERVER_TIMEWAIT:
640 val = dp->dccps_server_timewait;
641 break;
642 case DCCP_SOCKOPT_SEND_CSCOV:
643 val = dp->dccps_pcslen;
644 break;
645 case DCCP_SOCKOPT_RECV_CSCOV:
646 val = dp->dccps_pcrlen;
647 break;
648 case 128 ... 191:
649 return ccid_hc_rx_getsockopt(dp->dccps_hc_rx_ccid, sk, optname,
650 len, (u32 __user *)optval, optlen);
651 case 192 ... 255:
652 return ccid_hc_tx_getsockopt(dp->dccps_hc_tx_ccid, sk, optname,
653 len, (u32 __user *)optval, optlen);
654 default:
655 return -ENOPROTOOPT;
656 }
657
658 len = sizeof(val);
659 if (put_user(len, optlen) || copy_to_user(optval, &val, len))
660 return -EFAULT;
661
662 return 0;
663 }
664
665 int dccp_getsockopt(struct sock *sk, int level, int optname,
666 char __user *optval, int __user *optlen)
667 {
668 if (level != SOL_DCCP)
669 return inet_csk(sk)->icsk_af_ops->getsockopt(sk, level,
670 optname, optval,
671 optlen);
672 return do_dccp_getsockopt(sk, level, optname, optval, optlen);
673 }
674
675 EXPORT_SYMBOL_GPL(dccp_getsockopt);
676
677 #ifdef CONFIG_COMPAT
678 int compat_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_compat_getsockopt(sk, level, optname,
683 optval, optlen);
684 return do_dccp_getsockopt(sk, level, optname, optval, optlen);
685 }
686
687 EXPORT_SYMBOL_GPL(compat_dccp_getsockopt);
688 #endif
689
690 int dccp_sendmsg(struct kiocb *iocb, struct sock *sk, struct msghdr *msg,
691 size_t len)
692 {
693 const struct dccp_sock *dp = dccp_sk(sk);
694 const int flags = msg->msg_flags;
695 const int noblock = flags & MSG_DONTWAIT;
696 struct sk_buff *skb;
697 int rc, size;
698 long timeo;
699
700 if (len > dp->dccps_mss_cache)
701 return -EMSGSIZE;
702
703 lock_sock(sk);
704
705 if (sysctl_dccp_tx_qlen &&
706 (sk->sk_write_queue.qlen >= sysctl_dccp_tx_qlen)) {
707 rc = -EAGAIN;
708 goto out_release;
709 }
710
711 timeo = sock_sndtimeo(sk, noblock);
712
713 /*
714 * We have to use sk_stream_wait_connect here to set sk_write_pending,
715 * so that the trick in dccp_rcv_request_sent_state_process.
716 */
717 /* Wait for a connection to finish. */
718 if ((1 << sk->sk_state) & ~(DCCPF_OPEN | DCCPF_PARTOPEN))
719 if ((rc = sk_stream_wait_connect(sk, &timeo)) != 0)
720 goto out_release;
721
722 size = sk->sk_prot->max_header + len;
723 release_sock(sk);
724 skb = sock_alloc_send_skb(sk, size, noblock, &rc);
725 lock_sock(sk);
726 if (skb == NULL)
727 goto out_release;
728
729 skb_reserve(skb, sk->sk_prot->max_header);
730 rc = memcpy_fromiovec(skb_put(skb, len), msg->msg_iov, len);
731 if (rc != 0)
732 goto out_discard;
733
734 skb_queue_tail(&sk->sk_write_queue, skb);
735 dccp_write_xmit(sk,0);
736 out_release:
737 release_sock(sk);
738 return rc ? : len;
739 out_discard:
740 kfree_skb(skb);
741 goto out_release;
742 }
743
744 EXPORT_SYMBOL_GPL(dccp_sendmsg);
745
746 int dccp_recvmsg(struct kiocb *iocb, struct sock *sk, struct msghdr *msg,
747 size_t len, int nonblock, int flags, int *addr_len)
748 {
749 const struct dccp_hdr *dh;
750 long timeo;
751
752 lock_sock(sk);
753
754 if (sk->sk_state == DCCP_LISTEN) {
755 len = -ENOTCONN;
756 goto out;
757 }
758
759 timeo = sock_rcvtimeo(sk, nonblock);
760
761 do {
762 struct sk_buff *skb = skb_peek(&sk->sk_receive_queue);
763
764 if (skb == NULL)
765 goto verify_sock_status;
766
767 dh = dccp_hdr(skb);
768
769 switch (dh->dccph_type) {
770 case DCCP_PKT_DATA:
771 case DCCP_PKT_DATAACK:
772 goto found_ok_skb;
773
774 case DCCP_PKT_CLOSE:
775 case DCCP_PKT_CLOSEREQ:
776 if (!(flags & MSG_PEEK))
777 dccp_finish_passive_close(sk);
778 /* fall through */
779 case DCCP_PKT_RESET:
780 dccp_pr_debug("found fin (%s) ok!\n",
781 dccp_packet_name(dh->dccph_type));
782 len = 0;
783 goto found_fin_ok;
784 default:
785 dccp_pr_debug("packet_type=%s\n",
786 dccp_packet_name(dh->dccph_type));
787 sk_eat_skb(sk, skb, 0);
788 }
789 verify_sock_status:
790 if (sock_flag(sk, SOCK_DONE)) {
791 len = 0;
792 break;
793 }
794
795 if (sk->sk_err) {
796 len = sock_error(sk);
797 break;
798 }
799
800 if (sk->sk_shutdown & RCV_SHUTDOWN) {
801 len = 0;
802 break;
803 }
804
805 if (sk->sk_state == DCCP_CLOSED) {
806 if (!sock_flag(sk, SOCK_DONE)) {
807 /* This occurs when user tries to read
808 * from never connected socket.
809 */
810 len = -ENOTCONN;
811 break;
812 }
813 len = 0;
814 break;
815 }
816
817 if (!timeo) {
818 len = -EAGAIN;
819 break;
820 }
821
822 if (signal_pending(current)) {
823 len = sock_intr_errno(timeo);
824 break;
825 }
826
827 sk_wait_data(sk, &timeo);
828 continue;
829 found_ok_skb:
830 if (len > skb->len)
831 len = skb->len;
832 else if (len < skb->len)
833 msg->msg_flags |= MSG_TRUNC;
834
835 if (skb_copy_datagram_iovec(skb, 0, msg->msg_iov, len)) {
836 /* Exception. Bailout! */
837 len = -EFAULT;
838 break;
839 }
840 found_fin_ok:
841 if (!(flags & MSG_PEEK))
842 sk_eat_skb(sk, skb, 0);
843 break;
844 } while (1);
845 out:
846 release_sock(sk);
847 return len;
848 }
849
850 EXPORT_SYMBOL_GPL(dccp_recvmsg);
851
852 int inet_dccp_listen(struct socket *sock, int backlog)
853 {
854 struct sock *sk = sock->sk;
855 unsigned char old_state;
856 int err;
857
858 lock_sock(sk);
859
860 err = -EINVAL;
861 if (sock->state != SS_UNCONNECTED || sock->type != SOCK_DCCP)
862 goto out;
863
864 old_state = sk->sk_state;
865 if (!((1 << old_state) & (DCCPF_CLOSED | DCCPF_LISTEN)))
866 goto out;
867
868 /* Really, if the socket is already in listen state
869 * we can only allow the backlog to be adjusted.
870 */
871 if (old_state != DCCP_LISTEN) {
872 /*
873 * FIXME: here it probably should be sk->sk_prot->listen_start
874 * see tcp_listen_start
875 */
876 err = dccp_listen_start(sk, backlog);
877 if (err)
878 goto out;
879 }
880 sk->sk_max_ack_backlog = backlog;
881 err = 0;
882
883 out:
884 release_sock(sk);
885 return err;
886 }
887
888 EXPORT_SYMBOL_GPL(inet_dccp_listen);
889
890 static void dccp_terminate_connection(struct sock *sk)
891 {
892 u8 next_state = DCCP_CLOSED;
893
894 switch (sk->sk_state) {
895 case DCCP_PASSIVE_CLOSE:
896 case DCCP_PASSIVE_CLOSEREQ:
897 dccp_finish_passive_close(sk);
898 break;
899 case DCCP_PARTOPEN:
900 dccp_pr_debug("Stop PARTOPEN timer (%p)\n", sk);
901 inet_csk_clear_xmit_timer(sk, ICSK_TIME_DACK);
902 /* fall through */
903 case DCCP_OPEN:
904 dccp_send_close(sk, 1);
905
906 if (dccp_sk(sk)->dccps_role == DCCP_ROLE_SERVER &&
907 !dccp_sk(sk)->dccps_server_timewait)
908 next_state = DCCP_ACTIVE_CLOSEREQ;
909 else
910 next_state = DCCP_CLOSING;
911 /* fall through */
912 default:
913 dccp_set_state(sk, next_state);
914 }
915 }
916
917 void dccp_close(struct sock *sk, long timeout)
918 {
919 struct dccp_sock *dp = dccp_sk(sk);
920 struct sk_buff *skb;
921 u32 data_was_unread = 0;
922 int state;
923
924 lock_sock(sk);
925
926 sk->sk_shutdown = SHUTDOWN_MASK;
927
928 if (sk->sk_state == DCCP_LISTEN) {
929 dccp_set_state(sk, DCCP_CLOSED);
930
931 /* Special case. */
932 inet_csk_listen_stop(sk);
933
934 goto adjudge_to_death;
935 }
936
937 sk_stop_timer(sk, &dp->dccps_xmit_timer);
938
939 /*
940 * We need to flush the recv. buffs. We do this only on the
941 * descriptor close, not protocol-sourced closes, because the
942 *reader process may not have drained the data yet!
943 */
944 while ((skb = __skb_dequeue(&sk->sk_receive_queue)) != NULL) {
945 data_was_unread += skb->len;
946 __kfree_skb(skb);
947 }
948
949 if (data_was_unread) {
950 /* Unread data was tossed, send an appropriate Reset Code */
951 DCCP_WARN("DCCP: ABORT -- %u bytes unread\n", data_was_unread);
952 dccp_send_reset(sk, DCCP_RESET_CODE_ABORTED);
953 dccp_set_state(sk, DCCP_CLOSED);
954 } else if (sock_flag(sk, SOCK_LINGER) && !sk->sk_lingertime) {
955 /* Check zero linger _after_ checking for unread data. */
956 sk->sk_prot->disconnect(sk, 0);
957 } else if (sk->sk_state != DCCP_CLOSED) {
958 dccp_terminate_connection(sk);
959 }
960
961 sk_stream_wait_close(sk, timeout);
962
963 adjudge_to_death:
964 state = sk->sk_state;
965 sock_hold(sk);
966 sock_orphan(sk);
967
968 /*
969 * It is the last release_sock in its life. It will remove backlog.
970 */
971 release_sock(sk);
972 /*
973 * Now socket is owned by kernel and we acquire BH lock
974 * to finish close. No need to check for user refs.
975 */
976 local_bh_disable();
977 bh_lock_sock(sk);
978 WARN_ON(sock_owned_by_user(sk));
979
980 percpu_counter_inc(sk->sk_prot->orphan_count);
981
982 /* Have we already been destroyed by a softirq or backlog? */
983 if (state != DCCP_CLOSED && sk->sk_state == DCCP_CLOSED)
984 goto out;
985
986 if (sk->sk_state == DCCP_CLOSED)
987 inet_csk_destroy_sock(sk);
988
989 /* Otherwise, socket is reprieved until protocol close. */
990
991 out:
992 bh_unlock_sock(sk);
993 local_bh_enable();
994 sock_put(sk);
995 }
996
997 EXPORT_SYMBOL_GPL(dccp_close);
998
999 void dccp_shutdown(struct sock *sk, int how)
1000 {
1001 dccp_pr_debug("called shutdown(%x)\n", how);
1002 }
1003
1004 EXPORT_SYMBOL_GPL(dccp_shutdown);
1005
1006 static inline int dccp_mib_init(void)
1007 {
1008 return snmp_mib_init((void**)dccp_statistics, sizeof(struct dccp_mib));
1009 }
1010
1011 static inline void dccp_mib_exit(void)
1012 {
1013 snmp_mib_free((void**)dccp_statistics);
1014 }
1015
1016 static int thash_entries;
1017 module_param(thash_entries, int, 0444);
1018 MODULE_PARM_DESC(thash_entries, "Number of ehash buckets");
1019
1020 #ifdef CONFIG_IP_DCCP_DEBUG
1021 int dccp_debug;
1022 module_param(dccp_debug, bool, 0644);
1023 MODULE_PARM_DESC(dccp_debug, "Enable debug messages");
1024
1025 EXPORT_SYMBOL_GPL(dccp_debug);
1026 #endif
1027
1028 static int __init dccp_init(void)
1029 {
1030 unsigned long goal;
1031 int ehash_order, bhash_order, i;
1032 int rc;
1033
1034 BUILD_BUG_ON(sizeof(struct dccp_skb_cb) >
1035 FIELD_SIZEOF(struct sk_buff, cb));
1036 rc = percpu_counter_init(&dccp_orphan_count, 0);
1037 if (rc)
1038 goto out;
1039 rc = -ENOBUFS;
1040 inet_hashinfo_init(&dccp_hashinfo);
1041 dccp_hashinfo.bind_bucket_cachep =
1042 kmem_cache_create("dccp_bind_bucket",
1043 sizeof(struct inet_bind_bucket), 0,
1044 SLAB_HWCACHE_ALIGN, NULL);
1045 if (!dccp_hashinfo.bind_bucket_cachep)
1046 goto out_free_percpu;
1047
1048 /*
1049 * Size and allocate the main established and bind bucket
1050 * hash tables.
1051 *
1052 * The methodology is similar to that of the buffer cache.
1053 */
1054 if (num_physpages >= (128 * 1024))
1055 goal = num_physpages >> (21 - PAGE_SHIFT);
1056 else
1057 goal = num_physpages >> (23 - PAGE_SHIFT);
1058
1059 if (thash_entries)
1060 goal = (thash_entries *
1061 sizeof(struct inet_ehash_bucket)) >> PAGE_SHIFT;
1062 for (ehash_order = 0; (1UL << ehash_order) < goal; ehash_order++)
1063 ;
1064 do {
1065 dccp_hashinfo.ehash_size = (1UL << ehash_order) * PAGE_SIZE /
1066 sizeof(struct inet_ehash_bucket);
1067 while (dccp_hashinfo.ehash_size &
1068 (dccp_hashinfo.ehash_size - 1))
1069 dccp_hashinfo.ehash_size--;
1070 dccp_hashinfo.ehash = (struct inet_ehash_bucket *)
1071 __get_free_pages(GFP_ATOMIC, ehash_order);
1072 } while (!dccp_hashinfo.ehash && --ehash_order > 0);
1073
1074 if (!dccp_hashinfo.ehash) {
1075 DCCP_CRIT("Failed to allocate DCCP established hash table");
1076 goto out_free_bind_bucket_cachep;
1077 }
1078
1079 for (i = 0; i < dccp_hashinfo.ehash_size; i++) {
1080 INIT_HLIST_NULLS_HEAD(&dccp_hashinfo.ehash[i].chain, i);
1081 INIT_HLIST_NULLS_HEAD(&dccp_hashinfo.ehash[i].twchain, i);
1082 }
1083
1084 if (inet_ehash_locks_alloc(&dccp_hashinfo))
1085 goto out_free_dccp_ehash;
1086
1087 bhash_order = ehash_order;
1088
1089 do {
1090 dccp_hashinfo.bhash_size = (1UL << bhash_order) * PAGE_SIZE /
1091 sizeof(struct inet_bind_hashbucket);
1092 if ((dccp_hashinfo.bhash_size > (64 * 1024)) &&
1093 bhash_order > 0)
1094 continue;
1095 dccp_hashinfo.bhash = (struct inet_bind_hashbucket *)
1096 __get_free_pages(GFP_ATOMIC, bhash_order);
1097 } while (!dccp_hashinfo.bhash && --bhash_order >= 0);
1098
1099 if (!dccp_hashinfo.bhash) {
1100 DCCP_CRIT("Failed to allocate DCCP bind hash table");
1101 goto out_free_dccp_locks;
1102 }
1103
1104 for (i = 0; i < dccp_hashinfo.bhash_size; i++) {
1105 spin_lock_init(&dccp_hashinfo.bhash[i].lock);
1106 INIT_HLIST_HEAD(&dccp_hashinfo.bhash[i].chain);
1107 }
1108
1109 rc = dccp_mib_init();
1110 if (rc)
1111 goto out_free_dccp_bhash;
1112
1113 rc = dccp_ackvec_init();
1114 if (rc)
1115 goto out_free_dccp_mib;
1116
1117 rc = dccp_sysctl_init();
1118 if (rc)
1119 goto out_ackvec_exit;
1120
1121 rc = ccid_initialize_builtins();
1122 if (rc)
1123 goto out_sysctl_exit;
1124
1125 dccp_timestamping_init();
1126 out:
1127 return rc;
1128 out_sysctl_exit:
1129 dccp_sysctl_exit();
1130 out_ackvec_exit:
1131 dccp_ackvec_exit();
1132 out_free_dccp_mib:
1133 dccp_mib_exit();
1134 out_free_dccp_bhash:
1135 free_pages((unsigned long)dccp_hashinfo.bhash, bhash_order);
1136 dccp_hashinfo.bhash = NULL;
1137 out_free_dccp_locks:
1138 inet_ehash_locks_free(&dccp_hashinfo);
1139 out_free_dccp_ehash:
1140 free_pages((unsigned long)dccp_hashinfo.ehash, ehash_order);
1141 dccp_hashinfo.ehash = NULL;
1142 out_free_bind_bucket_cachep:
1143 kmem_cache_destroy(dccp_hashinfo.bind_bucket_cachep);
1144 dccp_hashinfo.bind_bucket_cachep = NULL;
1145 out_free_percpu:
1146 percpu_counter_destroy(&dccp_orphan_count);
1147 goto out;
1148 }
1149
1150 static void __exit dccp_fini(void)
1151 {
1152 ccid_cleanup_builtins();
1153 dccp_mib_exit();
1154 free_pages((unsigned long)dccp_hashinfo.bhash,
1155 get_order(dccp_hashinfo.bhash_size *
1156 sizeof(struct inet_bind_hashbucket)));
1157 free_pages((unsigned long)dccp_hashinfo.ehash,
1158 get_order(dccp_hashinfo.ehash_size *
1159 sizeof(struct inet_ehash_bucket)));
1160 inet_ehash_locks_free(&dccp_hashinfo);
1161 kmem_cache_destroy(dccp_hashinfo.bind_bucket_cachep);
1162 dccp_ackvec_exit();
1163 dccp_sysctl_exit();
1164 }
1165
1166 module_init(dccp_init);
1167 module_exit(dccp_fini);
1168
1169 MODULE_LICENSE("GPL");
1170 MODULE_AUTHOR("Arnaldo Carvalho de Melo <acme@conectiva.com.br>");
1171 MODULE_DESCRIPTION("DCCP - Datagram Congestion Controlled Protocol");
Linus' kernel tree