4 * An implementation of the DCCP protocol
5 * Arnaldo Carvalho de Melo <acme@conectiva.com.br>
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.
12 #include <linux/config.h>
13 #include <linux/dccp.h>
14 #include <linux/module.h>
15 #include <linux/types.h>
16 #include <linux/sched.h>
17 #include <linux/kernel.h>
18 #include <linux/skbuff.h>
19 #include <linux/netdevice.h>
21 #include <linux/if_arp.h>
22 #include <linux/init.h>
23 #include <linux/random.h>
24 #include <net/checksum.h>
26 #include <net/inet_sock.h>
30 #include <asm/semaphore.h>
31 #include <linux/spinlock.h>
32 #include <linux/timer.h>
33 #include <linux/delay.h>
34 #include <linux/poll.h>
40 DEFINE_SNMP_STAT(struct dccp_mib, dccp_statistics) __read_mostly;
42 EXPORT_SYMBOL_GPL(dccp_statistics);
44 atomic_t dccp_orphan_count = ATOMIC_INIT(0);
46 EXPORT_SYMBOL_GPL(dccp_orphan_count);
48 struct inet_hashinfo __cacheline_aligned dccp_hashinfo = {
49 .lhash_lock = RW_LOCK_UNLOCKED,
50 .lhash_users = ATOMIC_INIT(0),
51 .lhash_wait = __WAIT_QUEUE_HEAD_INITIALIZER(dccp_hashinfo.lhash_wait),
54 EXPORT_SYMBOL_GPL(dccp_hashinfo);
56 void dccp_set_state(struct sock *sk, const int state)
58 const int oldstate = sk->sk_state;
60 dccp_pr_debug("%s(%p) %-10.10s -> %s\n",
62 dccp_state_name(oldstate), dccp_state_name(state));
63 WARN_ON(state == oldstate);
67 if (oldstate != DCCP_OPEN)
68 DCCP_INC_STATS(DCCP_MIB_CURRESTAB);
72 if (oldstate == DCCP_CLOSING || oldstate == DCCP_OPEN)
73 DCCP_INC_STATS(DCCP_MIB_ESTABRESETS);
75 sk->sk_prot->unhash(sk);
76 if (inet_csk(sk)->icsk_bind_hash != NULL &&
77 !(sk->sk_userlocks & SOCK_BINDPORT_LOCK))
78 inet_put_port(&dccp_hashinfo, sk);
81 if (oldstate == DCCP_OPEN)
82 DCCP_DEC_STATS(DCCP_MIB_CURRESTAB);
85 /* Change state AFTER socket is unhashed to avoid closed
86 * socket sitting in hash tables.
91 EXPORT_SYMBOL_GPL(dccp_set_state);
93 void dccp_done(struct sock *sk)
95 dccp_set_state(sk, DCCP_CLOSED);
96 dccp_clear_xmit_timers(sk);
98 sk->sk_shutdown = SHUTDOWN_MASK;
100 if (!sock_flag(sk, SOCK_DEAD))
101 sk->sk_state_change(sk);
103 inet_csk_destroy_sock(sk);
106 EXPORT_SYMBOL_GPL(dccp_done);
108 const char *dccp_packet_name(const int type)
110 static const char *dccp_packet_names[] = {
111 [DCCP_PKT_REQUEST] = "REQUEST",
112 [DCCP_PKT_RESPONSE] = "RESPONSE",
113 [DCCP_PKT_DATA] = "DATA",
114 [DCCP_PKT_ACK] = "ACK",
115 [DCCP_PKT_DATAACK] = "DATAACK",
116 [DCCP_PKT_CLOSEREQ] = "CLOSEREQ",
117 [DCCP_PKT_CLOSE] = "CLOSE",
118 [DCCP_PKT_RESET] = "RESET",
119 [DCCP_PKT_SYNC] = "SYNC",
120 [DCCP_PKT_SYNCACK] = "SYNCACK",
123 if (type >= DCCP_NR_PKT_TYPES)
126 return dccp_packet_names[type];
129 EXPORT_SYMBOL_GPL(dccp_packet_name);
131 const char *dccp_state_name(const int state)
133 static char *dccp_state_names[] = {
134 [DCCP_OPEN] = "OPEN",
135 [DCCP_REQUESTING] = "REQUESTING",
136 [DCCP_PARTOPEN] = "PARTOPEN",
137 [DCCP_LISTEN] = "LISTEN",
138 [DCCP_RESPOND] = "RESPOND",
139 [DCCP_CLOSING] = "CLOSING",
140 [DCCP_TIME_WAIT] = "TIME_WAIT",
141 [DCCP_CLOSED] = "CLOSED",
144 if (state >= DCCP_MAX_STATES)
145 return "INVALID STATE!";
147 return dccp_state_names[state];
150 EXPORT_SYMBOL_GPL(dccp_state_name);
152 void dccp_hash(struct sock *sk)
154 inet_hash(&dccp_hashinfo, sk);
157 EXPORT_SYMBOL_GPL(dccp_hash);
159 void dccp_unhash(struct sock *sk)
161 inet_unhash(&dccp_hashinfo, sk);
164 EXPORT_SYMBOL_GPL(dccp_unhash);
166 int dccp_init_sock(struct sock *sk, const __u8 ctl_sock_initialized)
168 struct dccp_sock *dp = dccp_sk(sk);
169 struct inet_connection_sock *icsk = inet_csk(sk);
171 dccp_options_init(&dp->dccps_options);
172 do_gettimeofday(&dp->dccps_epoch);
175 * FIXME: We're hardcoding the CCID, and doing this at this point makes
176 * the listening (master) sock get CCID control blocks, which is not
177 * necessary, but for now, to not mess with the test userspace apps,
178 * lets leave it here, later the real solution is to do this in a
179 * setsockopt(CCIDs-I-want/accept). -acme
181 if (likely(ctl_sock_initialized)) {
182 int rc = dccp_feat_init(sk);
187 if (dp->dccps_options.dccpo_send_ack_vector) {
188 dp->dccps_hc_rx_ackvec = dccp_ackvec_alloc(GFP_KERNEL);
189 if (dp->dccps_hc_rx_ackvec == NULL)
192 dp->dccps_hc_rx_ccid =
193 ccid_hc_rx_new(dp->dccps_options.dccpo_rx_ccid,
195 dp->dccps_hc_tx_ccid =
196 ccid_hc_tx_new(dp->dccps_options.dccpo_tx_ccid,
198 if (unlikely(dp->dccps_hc_rx_ccid == NULL ||
199 dp->dccps_hc_tx_ccid == NULL)) {
200 ccid_hc_rx_delete(dp->dccps_hc_rx_ccid, sk);
201 ccid_hc_tx_delete(dp->dccps_hc_tx_ccid, sk);
202 if (dp->dccps_options.dccpo_send_ack_vector) {
203 dccp_ackvec_free(dp->dccps_hc_rx_ackvec);
204 dp->dccps_hc_rx_ackvec = NULL;
206 dp->dccps_hc_rx_ccid = dp->dccps_hc_tx_ccid = NULL;
210 /* control socket doesn't need feat nego */
211 INIT_LIST_HEAD(&dp->dccps_options.dccpo_pending);
212 INIT_LIST_HEAD(&dp->dccps_options.dccpo_conf);
215 dccp_init_xmit_timers(sk);
216 icsk->icsk_rto = DCCP_TIMEOUT_INIT;
217 sk->sk_state = DCCP_CLOSED;
218 sk->sk_write_space = dccp_write_space;
219 icsk->icsk_sync_mss = dccp_sync_mss;
220 dp->dccps_mss_cache = 536;
221 dp->dccps_role = DCCP_ROLE_UNDEFINED;
222 dp->dccps_service = DCCP_SERVICE_INVALID_VALUE;
223 dp->dccps_l_ack_ratio = dp->dccps_r_ack_ratio = 1;
228 EXPORT_SYMBOL_GPL(dccp_init_sock);
230 int dccp_destroy_sock(struct sock *sk)
232 struct dccp_sock *dp = dccp_sk(sk);
235 * DCCP doesn't use sk_write_queue, just sk_send_head
236 * for retransmissions
238 if (sk->sk_send_head != NULL) {
239 kfree_skb(sk->sk_send_head);
240 sk->sk_send_head = NULL;
243 /* Clean up a referenced DCCP bind bucket. */
244 if (inet_csk(sk)->icsk_bind_hash != NULL)
245 inet_put_port(&dccp_hashinfo, sk);
247 kfree(dp->dccps_service_list);
248 dp->dccps_service_list = NULL;
250 if (dp->dccps_options.dccpo_send_ack_vector) {
251 dccp_ackvec_free(dp->dccps_hc_rx_ackvec);
252 dp->dccps_hc_rx_ackvec = NULL;
254 ccid_hc_rx_delete(dp->dccps_hc_rx_ccid, sk);
255 ccid_hc_tx_delete(dp->dccps_hc_tx_ccid, sk);
256 dp->dccps_hc_rx_ccid = dp->dccps_hc_tx_ccid = NULL;
258 /* clean up feature negotiation state */
264 EXPORT_SYMBOL_GPL(dccp_destroy_sock);
266 static inline int dccp_listen_start(struct sock *sk)
268 struct dccp_sock *dp = dccp_sk(sk);
270 dp->dccps_role = DCCP_ROLE_LISTEN;
272 * Apps need to use setsockopt(DCCP_SOCKOPT_SERVICE)
273 * before calling listen()
275 if (dccp_service_not_initialized(sk))
277 return inet_csk_listen_start(sk, TCP_SYNQ_HSIZE);
280 int dccp_disconnect(struct sock *sk, int flags)
282 struct inet_connection_sock *icsk = inet_csk(sk);
283 struct inet_sock *inet = inet_sk(sk);
285 const int old_state = sk->sk_state;
287 if (old_state != DCCP_CLOSED)
288 dccp_set_state(sk, DCCP_CLOSED);
290 /* ABORT function of RFC793 */
291 if (old_state == DCCP_LISTEN) {
292 inet_csk_listen_stop(sk);
293 /* FIXME: do the active reset thing */
294 } else if (old_state == DCCP_REQUESTING)
295 sk->sk_err = ECONNRESET;
297 dccp_clear_xmit_timers(sk);
298 __skb_queue_purge(&sk->sk_receive_queue);
299 if (sk->sk_send_head != NULL) {
300 __kfree_skb(sk->sk_send_head);
301 sk->sk_send_head = NULL;
306 if (!(sk->sk_userlocks & SOCK_BINDADDR_LOCK))
307 inet_reset_saddr(sk);
310 sock_reset_flag(sk, SOCK_DONE);
312 icsk->icsk_backoff = 0;
313 inet_csk_delack_init(sk);
316 BUG_TRAP(!inet->num || icsk->icsk_bind_hash);
318 sk->sk_error_report(sk);
322 EXPORT_SYMBOL_GPL(dccp_disconnect);
325 * Wait for a DCCP event.
327 * Note that we don't need to lock the socket, as the upper poll layers
328 * take care of normal races (between the test and the event) and we don't
329 * go look at any of the socket buffers directly.
331 unsigned int dccp_poll(struct file *file, struct socket *sock,
335 struct sock *sk = sock->sk;
337 poll_wait(file, sk->sk_sleep, wait);
338 if (sk->sk_state == DCCP_LISTEN)
339 return inet_csk_listen_poll(sk);
341 /* Socket is not locked. We are protected from async events
342 by poll logic and correct handling of state changes
343 made by another threads is impossible in any case.
350 if (sk->sk_shutdown == SHUTDOWN_MASK || sk->sk_state == DCCP_CLOSED)
352 if (sk->sk_shutdown & RCV_SHUTDOWN)
353 mask |= POLLIN | POLLRDNORM;
356 if ((1 << sk->sk_state) & ~(DCCPF_REQUESTING | DCCPF_RESPOND)) {
357 if (atomic_read(&sk->sk_rmem_alloc) > 0)
358 mask |= POLLIN | POLLRDNORM;
360 if (!(sk->sk_shutdown & SEND_SHUTDOWN)) {
361 if (sk_stream_wspace(sk) >= sk_stream_min_wspace(sk)) {
362 mask |= POLLOUT | POLLWRNORM;
363 } else { /* send SIGIO later */
364 set_bit(SOCK_ASYNC_NOSPACE,
365 &sk->sk_socket->flags);
366 set_bit(SOCK_NOSPACE, &sk->sk_socket->flags);
368 /* Race breaker. If space is freed after
369 * wspace test but before the flags are set,
370 * IO signal will be lost.
372 if (sk_stream_wspace(sk) >= sk_stream_min_wspace(sk))
373 mask |= POLLOUT | POLLWRNORM;
380 EXPORT_SYMBOL_GPL(dccp_poll);
382 int dccp_ioctl(struct sock *sk, int cmd, unsigned long arg)
384 dccp_pr_debug("entry\n");
388 EXPORT_SYMBOL_GPL(dccp_ioctl);
390 static int dccp_setsockopt_service(struct sock *sk, const __be32 service,
391 char __user *optval, int optlen)
393 struct dccp_sock *dp = dccp_sk(sk);
394 struct dccp_service_list *sl = NULL;
396 if (service == DCCP_SERVICE_INVALID_VALUE ||
397 optlen > DCCP_SERVICE_LIST_MAX_LEN * sizeof(u32))
400 if (optlen > sizeof(service)) {
401 sl = kmalloc(optlen, GFP_KERNEL);
405 sl->dccpsl_nr = optlen / sizeof(u32) - 1;
406 if (copy_from_user(sl->dccpsl_list,
407 optval + sizeof(service),
408 optlen - sizeof(service)) ||
409 dccp_list_has_service(sl, DCCP_SERVICE_INVALID_VALUE)) {
416 dp->dccps_service = service;
418 kfree(dp->dccps_service_list);
420 dp->dccps_service_list = sl;
425 /* byte 1 is feature. the rest is the preference list */
426 static int dccp_setsockopt_change(struct sock *sk, int type,
427 struct dccp_so_feat __user *optval)
429 struct dccp_so_feat opt;
433 if (copy_from_user(&opt, optval, sizeof(opt)))
436 val = kmalloc(opt.dccpsf_len, GFP_KERNEL);
440 if (copy_from_user(val, opt.dccpsf_val, opt.dccpsf_len)) {
445 rc = dccp_feat_change(sk, type, opt.dccpsf_feat, val, opt.dccpsf_len,
458 static int do_dccp_setsockopt(struct sock *sk, int level, int optname,
459 char __user *optval, int optlen)
461 struct dccp_sock *dp;
465 if (optlen < sizeof(int))
468 if (get_user(val, (int __user *)optval))
471 if (optname == DCCP_SOCKOPT_SERVICE)
472 return dccp_setsockopt_service(sk, val, optval, optlen);
479 case DCCP_SOCKOPT_PACKET_SIZE:
480 dp->dccps_packet_size = val;
483 case DCCP_SOCKOPT_CHANGE_L:
484 if (optlen != sizeof(struct dccp_so_feat))
487 err = dccp_setsockopt_change(sk, DCCPO_CHANGE_L,
488 (struct dccp_so_feat *)
492 case DCCP_SOCKOPT_CHANGE_R:
493 if (optlen != sizeof(struct dccp_so_feat))
496 err = dccp_setsockopt_change(sk, DCCPO_CHANGE_R,
497 (struct dccp_so_feat *)
510 int dccp_setsockopt(struct sock *sk, int level, int optname,
511 char __user *optval, int optlen)
513 if (level != SOL_DCCP)
514 return inet_csk(sk)->icsk_af_ops->setsockopt(sk, level,
517 return do_dccp_setsockopt(sk, level, optname, optval, optlen);
519 EXPORT_SYMBOL_GPL(dccp_setsockopt);
522 int compat_dccp_setsockopt(struct sock *sk, int level, int optname,
523 char __user *optval, int optlen)
525 if (level != SOL_DCCP)
526 return inet_csk_compat_setsockopt(sk, level, optname,
529 return do_dccp_setsockopt(sk, level, optname, optval, optlen);
531 EXPORT_SYMBOL_GPL(compat_dccp_setsockopt);
534 static int dccp_getsockopt_service(struct sock *sk, int len,
535 __be32 __user *optval,
538 const struct dccp_sock *dp = dccp_sk(sk);
539 const struct dccp_service_list *sl;
540 int err = -ENOENT, slen = 0, total_len = sizeof(u32);
543 if (dccp_service_not_initialized(sk))
546 if ((sl = dp->dccps_service_list) != NULL) {
547 slen = sl->dccpsl_nr * sizeof(u32);
556 if (put_user(total_len, optlen) ||
557 put_user(dp->dccps_service, optval) ||
558 (sl != NULL && copy_to_user(optval + 1, sl->dccpsl_list, slen)))
565 static int do_dccp_getsockopt(struct sock *sk, int level, int optname,
566 char __user *optval, int __user *optlen)
568 struct dccp_sock *dp;
571 if (get_user(len, optlen))
574 if (len < sizeof(int))
580 case DCCP_SOCKOPT_PACKET_SIZE:
581 val = dp->dccps_packet_size;
582 len = sizeof(dp->dccps_packet_size);
584 case DCCP_SOCKOPT_SERVICE:
585 return dccp_getsockopt_service(sk, len,
586 (__be32 __user *)optval, optlen);
588 return ccid_hc_rx_getsockopt(dp->dccps_hc_rx_ccid, sk, optname,
589 len, (u32 __user *)optval, optlen);
591 return ccid_hc_tx_getsockopt(dp->dccps_hc_tx_ccid, sk, optname,
592 len, (u32 __user *)optval, optlen);
597 if (put_user(len, optlen) || copy_to_user(optval, &val, len))
603 int dccp_getsockopt(struct sock *sk, int level, int optname,
604 char __user *optval, int __user *optlen)
606 if (level != SOL_DCCP)
607 return inet_csk(sk)->icsk_af_ops->getsockopt(sk, level,
610 return do_dccp_getsockopt(sk, level, optname, optval, optlen);
612 EXPORT_SYMBOL_GPL(dccp_getsockopt);
615 int compat_dccp_getsockopt(struct sock *sk, int level, int optname,
616 char __user *optval, int __user *optlen)
618 if (level != SOL_DCCP)
619 return inet_csk_compat_getsockopt(sk, level, optname,
621 return do_dccp_getsockopt(sk, level, optname, optval, optlen);
623 EXPORT_SYMBOL_GPL(compat_dccp_getsockopt);
626 int dccp_sendmsg(struct kiocb *iocb, struct sock *sk, struct msghdr *msg,
629 const struct dccp_sock *dp = dccp_sk(sk);
630 const int flags = msg->msg_flags;
631 const int noblock = flags & MSG_DONTWAIT;
636 if (len > dp->dccps_mss_cache)
640 timeo = sock_sndtimeo(sk, noblock);
643 * We have to use sk_stream_wait_connect here to set sk_write_pending,
644 * so that the trick in dccp_rcv_request_sent_state_process.
646 /* Wait for a connection to finish. */
647 if ((1 << sk->sk_state) & ~(DCCPF_OPEN | DCCPF_PARTOPEN | DCCPF_CLOSING))
648 if ((rc = sk_stream_wait_connect(sk, &timeo)) != 0)
651 size = sk->sk_prot->max_header + len;
653 skb = sock_alloc_send_skb(sk, size, noblock, &rc);
658 skb_reserve(skb, sk->sk_prot->max_header);
659 rc = memcpy_fromiovec(skb_put(skb, len), msg->msg_iov, len);
663 rc = dccp_write_xmit(sk, skb, &timeo);
665 * XXX we don't use sk_write_queue, so just discard the packet.
666 * Current plan however is to _use_ sk_write_queue with
667 * an algorith similar to tcp_sendmsg, where the main difference
668 * is that in DCCP we have to respect packet boundaries, so
669 * no coalescing of skbs.
671 * This bug was _quickly_ found & fixed by just looking at an OSTRA
672 * generated callgraph 8) -acme
682 EXPORT_SYMBOL_GPL(dccp_sendmsg);
684 int dccp_recvmsg(struct kiocb *iocb, struct sock *sk, struct msghdr *msg,
685 size_t len, int nonblock, int flags, int *addr_len)
687 const struct dccp_hdr *dh;
692 if (sk->sk_state == DCCP_LISTEN) {
697 timeo = sock_rcvtimeo(sk, nonblock);
700 struct sk_buff *skb = skb_peek(&sk->sk_receive_queue);
703 goto verify_sock_status;
707 if (dh->dccph_type == DCCP_PKT_DATA ||
708 dh->dccph_type == DCCP_PKT_DATAACK)
711 if (dh->dccph_type == DCCP_PKT_RESET ||
712 dh->dccph_type == DCCP_PKT_CLOSE) {
713 dccp_pr_debug("found fin ok!\n");
717 dccp_pr_debug("packet_type=%s\n",
718 dccp_packet_name(dh->dccph_type));
721 if (sock_flag(sk, SOCK_DONE)) {
727 len = sock_error(sk);
731 if (sk->sk_shutdown & RCV_SHUTDOWN) {
736 if (sk->sk_state == DCCP_CLOSED) {
737 if (!sock_flag(sk, SOCK_DONE)) {
738 /* This occurs when user tries to read
739 * from never connected socket.
753 if (signal_pending(current)) {
754 len = sock_intr_errno(timeo);
758 sk_wait_data(sk, &timeo);
763 else if (len < skb->len)
764 msg->msg_flags |= MSG_TRUNC;
766 if (skb_copy_datagram_iovec(skb, 0, msg->msg_iov, len)) {
767 /* Exception. Bailout! */
772 if (!(flags & MSG_PEEK))
781 EXPORT_SYMBOL_GPL(dccp_recvmsg);
783 int inet_dccp_listen(struct socket *sock, int backlog)
785 struct sock *sk = sock->sk;
786 unsigned char old_state;
792 if (sock->state != SS_UNCONNECTED || sock->type != SOCK_DCCP)
795 old_state = sk->sk_state;
796 if (!((1 << old_state) & (DCCPF_CLOSED | DCCPF_LISTEN)))
799 /* Really, if the socket is already in listen state
800 * we can only allow the backlog to be adjusted.
802 if (old_state != DCCP_LISTEN) {
804 * FIXME: here it probably should be sk->sk_prot->listen_start
805 * see tcp_listen_start
807 err = dccp_listen_start(sk);
811 sk->sk_max_ack_backlog = backlog;
819 EXPORT_SYMBOL_GPL(inet_dccp_listen);
821 static const unsigned char dccp_new_state[] = {
822 /* current state: new state: action: */
824 [DCCP_OPEN] = DCCP_CLOSING | DCCP_ACTION_FIN,
825 [DCCP_REQUESTING] = DCCP_CLOSED,
826 [DCCP_PARTOPEN] = DCCP_CLOSING | DCCP_ACTION_FIN,
827 [DCCP_LISTEN] = DCCP_CLOSED,
828 [DCCP_RESPOND] = DCCP_CLOSED,
829 [DCCP_CLOSING] = DCCP_CLOSED,
830 [DCCP_TIME_WAIT] = DCCP_CLOSED,
831 [DCCP_CLOSED] = DCCP_CLOSED,
834 static int dccp_close_state(struct sock *sk)
836 const int next = dccp_new_state[sk->sk_state];
837 const int ns = next & DCCP_STATE_MASK;
839 if (ns != sk->sk_state)
840 dccp_set_state(sk, ns);
842 return next & DCCP_ACTION_FIN;
845 void dccp_close(struct sock *sk, long timeout)
851 sk->sk_shutdown = SHUTDOWN_MASK;
853 if (sk->sk_state == DCCP_LISTEN) {
854 dccp_set_state(sk, DCCP_CLOSED);
857 inet_csk_listen_stop(sk);
859 goto adjudge_to_death;
863 * We need to flush the recv. buffs. We do this only on the
864 * descriptor close, not protocol-sourced closes, because the
865 *reader process may not have drained the data yet!
867 /* FIXME: check for unread data */
868 while ((skb = __skb_dequeue(&sk->sk_receive_queue)) != NULL) {
872 if (sock_flag(sk, SOCK_LINGER) && !sk->sk_lingertime) {
873 /* Check zero linger _after_ checking for unread data. */
874 sk->sk_prot->disconnect(sk, 0);
875 } else if (dccp_close_state(sk)) {
876 dccp_send_close(sk, 1);
879 sk_stream_wait_close(sk, timeout);
883 * It is the last release_sock in its life. It will remove backlog.
887 * Now socket is owned by kernel and we acquire BH lock
888 * to finish close. No need to check for user refs.
892 BUG_TRAP(!sock_owned_by_user(sk));
898 * The last release_sock may have processed the CLOSE or RESET
899 * packet moving sock to CLOSED state, if not we have to fire
900 * the CLOSE/CLOSEREQ retransmission timer, see "8.3. Termination"
901 * in draft-ietf-dccp-spec-11. -acme
903 if (sk->sk_state == DCCP_CLOSING) {
904 /* FIXME: should start at 2 * RTT */
905 /* Timer for repeating the CLOSE/CLOSEREQ until an answer. */
906 inet_csk_reset_xmit_timer(sk, ICSK_TIME_RETRANS,
907 inet_csk(sk)->icsk_rto,
910 /* Yeah, we should use sk->sk_prot->orphan_count, etc */
911 dccp_set_state(sk, DCCP_CLOSED);
915 atomic_inc(sk->sk_prot->orphan_count);
916 if (sk->sk_state == DCCP_CLOSED)
917 inet_csk_destroy_sock(sk);
919 /* Otherwise, socket is reprieved until protocol close. */
926 EXPORT_SYMBOL_GPL(dccp_close);
928 void dccp_shutdown(struct sock *sk, int how)
930 dccp_pr_debug("entry\n");
933 EXPORT_SYMBOL_GPL(dccp_shutdown);
935 static int __init dccp_mib_init(void)
939 dccp_statistics[0] = alloc_percpu(struct dccp_mib);
940 if (dccp_statistics[0] == NULL)
943 dccp_statistics[1] = alloc_percpu(struct dccp_mib);
944 if (dccp_statistics[1] == NULL)
951 free_percpu(dccp_statistics[0]);
952 dccp_statistics[0] = NULL;
957 static void dccp_mib_exit(void)
959 free_percpu(dccp_statistics[0]);
960 free_percpu(dccp_statistics[1]);
961 dccp_statistics[0] = dccp_statistics[1] = NULL;
964 static int thash_entries;
965 module_param(thash_entries, int, 0444);
966 MODULE_PARM_DESC(thash_entries, "Number of ehash buckets");
968 #ifdef CONFIG_IP_DCCP_DEBUG
970 module_param(dccp_debug, int, 0444);
971 MODULE_PARM_DESC(dccp_debug, "Enable debug messages");
973 EXPORT_SYMBOL_GPL(dccp_debug);
976 static int __init dccp_init(void)
979 int ehash_order, bhash_order, i;
982 dccp_hashinfo.bind_bucket_cachep =
983 kmem_cache_create("dccp_bind_bucket",
984 sizeof(struct inet_bind_bucket), 0,
985 SLAB_HWCACHE_ALIGN, NULL, NULL);
986 if (!dccp_hashinfo.bind_bucket_cachep)
990 * Size and allocate the main established and bind bucket
993 * The methodology is similar to that of the buffer cache.
995 if (num_physpages >= (128 * 1024))
996 goal = num_physpages >> (21 - PAGE_SHIFT);
998 goal = num_physpages >> (23 - PAGE_SHIFT);
1001 goal = (thash_entries *
1002 sizeof(struct inet_ehash_bucket)) >> PAGE_SHIFT;
1003 for (ehash_order = 0; (1UL << ehash_order) < goal; ehash_order++)
1006 dccp_hashinfo.ehash_size = (1UL << ehash_order) * PAGE_SIZE /
1007 sizeof(struct inet_ehash_bucket);
1008 dccp_hashinfo.ehash_size >>= 1;
1009 while (dccp_hashinfo.ehash_size &
1010 (dccp_hashinfo.ehash_size - 1))
1011 dccp_hashinfo.ehash_size--;
1012 dccp_hashinfo.ehash = (struct inet_ehash_bucket *)
1013 __get_free_pages(GFP_ATOMIC, ehash_order);
1014 } while (!dccp_hashinfo.ehash && --ehash_order > 0);
1016 if (!dccp_hashinfo.ehash) {
1017 printk(KERN_CRIT "Failed to allocate DCCP "
1018 "established hash table\n");
1019 goto out_free_bind_bucket_cachep;
1022 for (i = 0; i < (dccp_hashinfo.ehash_size << 1); i++) {
1023 rwlock_init(&dccp_hashinfo.ehash[i].lock);
1024 INIT_HLIST_HEAD(&dccp_hashinfo.ehash[i].chain);
1027 bhash_order = ehash_order;
1030 dccp_hashinfo.bhash_size = (1UL << bhash_order) * PAGE_SIZE /
1031 sizeof(struct inet_bind_hashbucket);
1032 if ((dccp_hashinfo.bhash_size > (64 * 1024)) &&
1035 dccp_hashinfo.bhash = (struct inet_bind_hashbucket *)
1036 __get_free_pages(GFP_ATOMIC, bhash_order);
1037 } while (!dccp_hashinfo.bhash && --bhash_order >= 0);
1039 if (!dccp_hashinfo.bhash) {
1040 printk(KERN_CRIT "Failed to allocate DCCP bind hash table\n");
1041 goto out_free_dccp_ehash;
1044 for (i = 0; i < dccp_hashinfo.bhash_size; i++) {
1045 spin_lock_init(&dccp_hashinfo.bhash[i].lock);
1046 INIT_HLIST_HEAD(&dccp_hashinfo.bhash[i].chain);
1049 rc = dccp_mib_init();
1051 goto out_free_dccp_bhash;
1053 rc = dccp_ackvec_init();
1055 goto out_free_dccp_mib;
1057 rc = dccp_sysctl_init();
1059 goto out_ackvec_exit;
1066 out_free_dccp_bhash:
1067 free_pages((unsigned long)dccp_hashinfo.bhash, bhash_order);
1068 dccp_hashinfo.bhash = NULL;
1069 out_free_dccp_ehash:
1070 free_pages((unsigned long)dccp_hashinfo.ehash, ehash_order);
1071 dccp_hashinfo.ehash = NULL;
1072 out_free_bind_bucket_cachep:
1073 kmem_cache_destroy(dccp_hashinfo.bind_bucket_cachep);
1074 dccp_hashinfo.bind_bucket_cachep = NULL;
1078 static void __exit dccp_fini(void)
1081 free_pages((unsigned long)dccp_hashinfo.bhash,
1082 get_order(dccp_hashinfo.bhash_size *
1083 sizeof(struct inet_bind_hashbucket)));
1084 free_pages((unsigned long)dccp_hashinfo.ehash,
1085 get_order(dccp_hashinfo.ehash_size *
1086 sizeof(struct inet_ehash_bucket)));
1087 kmem_cache_destroy(dccp_hashinfo.bind_bucket_cachep);
1092 module_init(dccp_init);
1093 module_exit(dccp_fini);
1095 MODULE_LICENSE("GPL");
1096 MODULE_AUTHOR("Arnaldo Carvalho de Melo <acme@conectiva.com.br>");
1097 MODULE_DESCRIPTION("DCCP - Datagram Congestion Controlled Protocol");