* 2 of the License, or (at your option) any later version.
*/
-#include <linux/config.h>
#include <linux/dccp.h>
#include <linux/skbuff.h>
#include "dccp.h"
-static void dccp_write_timer(unsigned long data);
-static void dccp_keepalive_timer(unsigned long data);
-static void dccp_delack_timer(unsigned long data);
-
-void dccp_init_xmit_timers(struct sock *sk)
-{
- inet_csk_init_xmit_timers(sk, &dccp_write_timer, &dccp_delack_timer,
- &dccp_keepalive_timer);
-}
+/* sysctl variables governing numbers of retransmission attempts */
+int sysctl_dccp_request_retries __read_mostly = TCP_SYN_RETRIES;
+int sysctl_dccp_retries1 __read_mostly = TCP_RETR1;
+int sysctl_dccp_retries2 __read_mostly = TCP_RETR2;
static void dccp_write_err(struct sock *sk)
{
sk->sk_err = sk->sk_err_soft ? : ETIMEDOUT;
sk->sk_error_report(sk);
- dccp_v4_send_reset(sk, DCCP_RESET_CODE_ABORTED);
+ dccp_send_reset(sk, DCCP_RESET_CODE_ABORTED);
dccp_done(sk);
DCCP_INC_STATS_BH(DCCP_MIB_ABORTONTIMEOUT);
}
if (sk->sk_state == DCCP_REQUESTING || sk->sk_state == DCCP_PARTOPEN) {
if (icsk->icsk_retransmits != 0)
dst_negative_advice(&sk->sk_dst_cache);
- retry_until = icsk->icsk_syn_retries ? : /* FIXME! */ 3 /* FIXME! sysctl_tcp_syn_retries */;
+ retry_until = icsk->icsk_syn_retries ?
+ : sysctl_dccp_request_retries;
} else {
- if (icsk->icsk_retransmits >= /* FIXME! sysctl_tcp_retries1 */ 5 /* FIXME! */) {
- /* NOTE. draft-ietf-tcpimpl-pmtud-01.txt requires pmtu black
- hole detection. :-(
+ if (icsk->icsk_retransmits >= sysctl_dccp_retries1) {
+ /* NOTE. draft-ietf-tcpimpl-pmtud-01.txt requires pmtu
+ black hole detection. :-(
It is place to make it. It is not made. I do not want
to make it. It is disguisting. It does not work in any
dst_negative_advice(&sk->sk_dst_cache);
}
- retry_until = /* FIXME! */ 15 /* FIXME! sysctl_tcp_retries2 */;
+ retry_until = sysctl_dccp_retries2;
/*
* FIXME: see tcp_write_timout and tcp_out_of_resources
*/
return 0;
}
-/* This is the same as tcp_delack_timer, sans prequeue & mem_reclaim stuff */
-static void dccp_delack_timer(unsigned long data)
-{
- struct sock *sk = (struct sock *)data;
- struct inet_connection_sock *icsk = inet_csk(sk);
-
- bh_lock_sock(sk);
- if (sock_owned_by_user(sk)) {
- /* Try again later. */
- icsk->icsk_ack.blocked = 1;
- NET_INC_STATS_BH(LINUX_MIB_DELAYEDACKLOCKED);
- sk_reset_timer(sk, &icsk->icsk_delack_timer, jiffies + TCP_DELACK_MIN);
- goto out;
- }
-
- if (sk->sk_state == DCCP_CLOSED || !(icsk->icsk_ack.pending & ICSK_ACK_TIMER))
- goto out;
- if (time_after(icsk->icsk_ack.timeout, jiffies)) {
- sk_reset_timer(sk, &icsk->icsk_delack_timer, icsk->icsk_ack.timeout);
- goto out;
- }
-
- icsk->icsk_ack.pending &= ~ICSK_ACK_TIMER;
-
- if (inet_csk_ack_scheduled(sk)) {
- if (!icsk->icsk_ack.pingpong) {
- /* Delayed ACK missed: inflate ATO. */
- icsk->icsk_ack.ato = min(icsk->icsk_ack.ato << 1, icsk->icsk_rto);
- } else {
- /* Delayed ACK missed: leave pingpong mode and
- * deflate ATO.
- */
- icsk->icsk_ack.pingpong = 0;
- icsk->icsk_ack.ato = TCP_ATO_MIN;
- }
- dccp_send_ack(sk);
- NET_INC_STATS_BH(LINUX_MIB_DELAYEDACKS);
- }
-out:
- bh_unlock_sock(sk);
- sock_put(sk);
-}
-
/*
* The DCCP retransmit timer.
*/
{
struct inet_connection_sock *icsk = inet_csk(sk);
+ /* retransmit timer is used for feature negotiation throughout
+ * connection. In this case, no packet is re-transmitted, but rather an
+ * ack is generated and pending changes are placed into its options.
+ */
+ if (sk->sk_send_head == NULL) {
+ dccp_pr_debug("feat negotiation retransmit timeout %p\n", sk);
+ if (sk->sk_state == DCCP_OPEN)
+ dccp_send_ack(sk);
+ goto backoff;
+ }
+
/*
* sk->sk_send_head has to have one skb with
* DCCP_SKB_CB(skb)->dccpd_type set to one of the retransmittable DCCP
- * packet types (REQUEST, RESPONSE, the ACK in the 3way hanshake
- * (PARTOPEN timer), etc).
- */
+ * packet types. The only packets eligible for retransmission are:
+ * -- Requests in client-REQUEST state (sec. 8.1.1)
+ * -- Acks in client-PARTOPEN state (sec. 8.1.5)
+ * -- CloseReq in server-CLOSEREQ state (sec. 8.3)
+ * -- Close in node-CLOSING state (sec. 8.3) */
BUG_TRAP(sk->sk_send_head != NULL);
/*
inet_csk_reset_xmit_timer(sk, ICSK_TIME_RETRANS,
min(icsk->icsk_rto,
TCP_RESOURCE_PROBE_INTERVAL),
- TCP_RTO_MAX);
+ DCCP_RTO_MAX);
goto out;
}
+backoff:
icsk->icsk_backoff++;
icsk->icsk_retransmits++;
icsk->icsk_rto = min(icsk->icsk_rto << 1, DCCP_RTO_MAX);
- inet_csk_reset_xmit_timer(sk, ICSK_TIME_RETRANS, icsk->icsk_rto, TCP_RTO_MAX);
- if (icsk->icsk_retransmits > 3 /* FIXME: sysctl_dccp_retries1 */)
+ inet_csk_reset_xmit_timer(sk, ICSK_TIME_RETRANS, icsk->icsk_rto,
+ DCCP_RTO_MAX);
+ if (icsk->icsk_retransmits > sysctl_dccp_retries1)
__sk_dst_reset(sk);
out:;
}
bh_lock_sock(sk);
if (sock_owned_by_user(sk)) {
/* Try again later */
- sk_reset_timer(sk, &icsk->icsk_retransmit_timer, jiffies + (HZ / 20));
+ sk_reset_timer(sk, &icsk->icsk_retransmit_timer,
+ jiffies + (HZ / 20));
goto out;
}
goto out;
if (time_after(icsk->icsk_timeout, jiffies)) {
- sk_reset_timer(sk, &icsk->icsk_retransmit_timer, icsk->icsk_timeout);
+ sk_reset_timer(sk, &icsk->icsk_retransmit_timer,
+ icsk->icsk_timeout);
goto out;
}
*/
static void dccp_response_timer(struct sock *sk)
{
- inet_csk_reqsk_queue_prune(sk, TCP_SYNQ_INTERVAL, DCCP_TIMEOUT_INIT, DCCP_RTO_MAX);
+ inet_csk_reqsk_queue_prune(sk, TCP_SYNQ_INTERVAL, DCCP_TIMEOUT_INIT,
+ DCCP_RTO_MAX);
}
static void dccp_keepalive_timer(unsigned long data)
bh_unlock_sock(sk);
sock_put(sk);
}
+
+/* This is the same as tcp_delack_timer, sans prequeue & mem_reclaim stuff */
+static void dccp_delack_timer(unsigned long data)
+{
+ struct sock *sk = (struct sock *)data;
+ struct inet_connection_sock *icsk = inet_csk(sk);
+
+ bh_lock_sock(sk);
+ if (sock_owned_by_user(sk)) {
+ /* Try again later. */
+ icsk->icsk_ack.blocked = 1;
+ NET_INC_STATS_BH(LINUX_MIB_DELAYEDACKLOCKED);
+ sk_reset_timer(sk, &icsk->icsk_delack_timer,
+ jiffies + TCP_DELACK_MIN);
+ goto out;
+ }
+
+ if (sk->sk_state == DCCP_CLOSED ||
+ !(icsk->icsk_ack.pending & ICSK_ACK_TIMER))
+ goto out;
+ if (time_after(icsk->icsk_ack.timeout, jiffies)) {
+ sk_reset_timer(sk, &icsk->icsk_delack_timer,
+ icsk->icsk_ack.timeout);
+ goto out;
+ }
+
+ icsk->icsk_ack.pending &= ~ICSK_ACK_TIMER;
+
+ if (inet_csk_ack_scheduled(sk)) {
+ if (!icsk->icsk_ack.pingpong) {
+ /* Delayed ACK missed: inflate ATO. */
+ icsk->icsk_ack.ato = min(icsk->icsk_ack.ato << 1,
+ icsk->icsk_rto);
+ } else {
+ /* Delayed ACK missed: leave pingpong mode and
+ * deflate ATO.
+ */
+ icsk->icsk_ack.pingpong = 0;
+ icsk->icsk_ack.ato = TCP_ATO_MIN;
+ }
+ dccp_send_ack(sk);
+ NET_INC_STATS_BH(LINUX_MIB_DELAYEDACKS);
+ }
+out:
+ bh_unlock_sock(sk);
+ sock_put(sk);
+}
+
+void dccp_init_xmit_timers(struct sock *sk)
+{
+ inet_csk_init_xmit_timers(sk, &dccp_write_timer, &dccp_delack_timer,
+ &dccp_keepalive_timer);
+}