1 files changed, 65 insertions, 188 deletions

diff --git a/net/ipv4/tcp_timer.c b/net/ipv4/tcp_timer.c
index 0084227438c2..415ee47ac1c5 100644
--- a/net/ipv4/tcp_timer.c
+++ b/net/ipv4/tcp_timer.c
@@ -36,49 +36,13 @@ static void tcp_write_timer(unsigned long);
 static void tcp_delack_timer(unsigned long);
 static void tcp_keepalive_timer (unsigned long data);
 
-#ifdef TCP_DEBUG
-const char tcp_timer_bug_msg[] = KERN_DEBUG "tcpbug: unknown timer value\n";
-EXPORT_SYMBOL(tcp_timer_bug_msg);
-#endif
-
-/*
- * Using different timers for retransmit, delayed acks and probes
- * We may wish use just one timer maintaining a list of expire jiffies 
- * to optimize.
- */
-
 void tcp_init_xmit_timers(struct sock *sk)
 {
-        struct tcp_sock *tp = tcp_sk(sk);
-
-        init_timer(&tp->retransmit_timer);
-        tp->retransmit_timer.function=&tcp_write_timer;
-        tp->retransmit_timer.data = (unsigned long) sk;
-        tp->pending = 0;
-
-        init_timer(&tp->delack_timer);
-        tp->delack_timer.function=&tcp_delack_timer;
-        tp->delack_timer.data = (unsigned long) sk;
-        tp->ack.pending = 0;
-
-        init_timer(&sk->sk_timer);
-        sk->sk_timer.function   = &tcp_keepalive_timer;
-        sk->sk_timer.data       = (unsigned long)sk;
+        inet_csk_init_xmit_timers(sk, &tcp_write_timer, &tcp_delack_timer,
+                                  &tcp_keepalive_timer);
 }
 
-void tcp_clear_xmit_timers(struct sock *sk)
-{
-        struct tcp_sock *tp = tcp_sk(sk);
-
-        tp->pending = 0;
-        sk_stop_timer(sk, &tp->retransmit_timer);
-
-        tp->ack.pending = 0;
-        tp->ack.blocked = 0;
-        sk_stop_timer(sk, &tp->delack_timer);
-
-        sk_stop_timer(sk, &sk->sk_timer);
-}
+EXPORT_SYMBOL(tcp_init_xmit_timers);
 
 static void tcp_write_err(struct sock *sk)
 {
@@ -155,15 +119,15 @@ static int tcp_orphan_retries(struct sock *sk, int alive)
 /* A write timeout has occurred. Process the after effects. */
 static int tcp_write_timeout(struct sock *sk)
 {
-        struct tcp_sock *tp = tcp_sk(sk);
+        const struct inet_connection_sock *icsk = inet_csk(sk);
         int retry_until;
 
         if ((1 << sk->sk_state) & (TCPF_SYN_SENT | TCPF_SYN_RECV)) {
-                if (tp->retransmits)
+                if (icsk->icsk_retransmits)
                         dst_negative_advice(&sk->sk_dst_cache);
-                retry_until = tp->syn_retries ? : sysctl_tcp_syn_retries;
+                retry_until = icsk->icsk_syn_retries ? : sysctl_tcp_syn_retries;
         } else {
-                if (tp->retransmits >= sysctl_tcp_retries1) {
+                if (icsk->icsk_retransmits >= sysctl_tcp_retries1) {
                         /* NOTE. draft-ietf-tcpimpl-pmtud-01.txt requires pmtu black
                            hole detection. :-(
 
@@ -189,16 +153,16 @@ static int tcp_write_timeout(struct sock *sk)
 
                 retry_until = sysctl_tcp_retries2;
                 if (sock_flag(sk, SOCK_DEAD)) {
-                        int alive = (tp->rto < TCP_RTO_MAX);
+                        const int alive = (icsk->icsk_rto < TCP_RTO_MAX);
  
                         retry_until = tcp_orphan_retries(sk, alive);
 
-                        if (tcp_out_of_resources(sk, alive || tp->retransmits < retry_until))
+                        if (tcp_out_of_resources(sk, alive || icsk->icsk_retransmits < retry_until))
                                 return 1;
                 }
         }
 
-        if (tp->retransmits >= retry_until) {
+        if (icsk->icsk_retransmits >= retry_until) {
                 /* Has it gone just too far? */
                 tcp_write_err(sk);
                 return 1;
@@ -210,26 +174,27 @@ static void tcp_delack_timer(unsigned long data)
 {
         struct sock *sk = (struct sock*)data;
         struct tcp_sock *tp = tcp_sk(sk);
+        struct inet_connection_sock *icsk = inet_csk(sk);
 
         bh_lock_sock(sk);
         if (sock_owned_by_user(sk)) {
                 /* Try again later. */
-                tp->ack.blocked = 1;
+                icsk->icsk_ack.blocked = 1;
                 NET_INC_STATS_BH(LINUX_MIB_DELAYEDACKLOCKED);
-                sk_reset_timer(sk, &tp->delack_timer, jiffies + TCP_DELACK_MIN);
+                sk_reset_timer(sk, &icsk->icsk_delack_timer, jiffies + TCP_DELACK_MIN);
                 goto out_unlock;
         }
 
         sk_stream_mem_reclaim(sk);
 
-        if (sk->sk_state == TCP_CLOSE || !(tp->ack.pending & TCP_ACK_TIMER))
+        if (sk->sk_state == TCP_CLOSE || !(icsk->icsk_ack.pending & ICSK_ACK_TIMER))
                 goto out;
 
-        if (time_after(tp->ack.timeout, jiffies)) {
-                sk_reset_timer(sk, &tp->delack_timer, tp->ack.timeout);
+        if (time_after(icsk->icsk_ack.timeout, jiffies)) {
+                sk_reset_timer(sk, &icsk->icsk_delack_timer, icsk->icsk_ack.timeout);
                 goto out;
         }
-        tp->ack.pending &= ~TCP_ACK_TIMER;
+        icsk->icsk_ack.pending &= ~ICSK_ACK_TIMER;
 
         if (!skb_queue_empty(&tp->ucopy.prequeue)) {
                 struct sk_buff *skb;
@@ -242,16 +207,16 @@ static void tcp_delack_timer(unsigned long data)
                 tp->ucopy.memory = 0;
         }
 
-        if (tcp_ack_scheduled(tp)) {
-                if (!tp->ack.pingpong) {
+        if (inet_csk_ack_scheduled(sk)) {
+                if (!icsk->icsk_ack.pingpong) {
                         /* Delayed ACK missed: inflate ATO. */
-                        tp->ack.ato = min(tp->ack.ato << 1, tp->rto);
+                        icsk->icsk_ack.ato = min(icsk->icsk_ack.ato << 1, icsk->icsk_rto);
                 } else {
                         /* Delayed ACK missed: leave pingpong mode and
                          * deflate ATO.
                          */
-                        tp->ack.pingpong = 0;
-                        tp->ack.ato = TCP_ATO_MIN;
+                        icsk->icsk_ack.pingpong = 0;
+                        icsk->icsk_ack.ato      = TCP_ATO_MIN;
                 }
                 tcp_send_ack(sk);
                 NET_INC_STATS_BH(LINUX_MIB_DELAYEDACKS);
@@ -268,11 +233,12 @@ out_unlock:
 
 static void tcp_probe_timer(struct sock *sk)
 {
+        struct inet_connection_sock *icsk = inet_csk(sk);
         struct tcp_sock *tp = tcp_sk(sk);
         int max_probes;
 
         if (tp->packets_out || !sk->sk_send_head) {
-                tp->probes_out = 0;
+                icsk->icsk_probes_out = 0;
                 return;
         }
 
@@ -283,7 +249,7 @@ static void tcp_probe_timer(struct sock *sk)
          * FIXME: We ought not to do it, Solaris 2.5 actually has fixing
          * this behaviour in Solaris down as a bug fix. [AC]
          *
-         * Let me to explain. probes_out is zeroed by incoming ACKs
+         * Let me to explain. icsk_probes_out is zeroed by incoming ACKs
          * even if they advertise zero window. Hence, connection is killed only
          * if we received no ACKs for normal connection timeout. It is not killed
          * only because window stays zero for some time, window may be zero
@@ -294,15 +260,15 @@ static void tcp_probe_timer(struct sock *sk)
         max_probes = sysctl_tcp_retries2;
 
         if (sock_flag(sk, SOCK_DEAD)) {
-                int alive = ((tp->rto<<tp->backoff) < TCP_RTO_MAX);
+                const int alive = ((icsk->icsk_rto << icsk->icsk_backoff) < TCP_RTO_MAX);
  
                 max_probes = tcp_orphan_retries(sk, alive);
 
-                if (tcp_out_of_resources(sk, alive || tp->probes_out <= max_probes))
+                if (tcp_out_of_resources(sk, alive || icsk->icsk_probes_out <= max_probes))
                         return;
         }
 
-        if (tp->probes_out > max_probes) {
+        if (icsk->icsk_probes_out > max_probes) {
                 tcp_write_err(sk);
         } else {
                 /* Only send another probe if we didn't close things up. */
@@ -317,6 +283,7 @@ static void tcp_probe_timer(struct sock *sk)
 static void tcp_retransmit_timer(struct sock *sk)
 {
         struct tcp_sock *tp = tcp_sk(sk);
+        struct inet_connection_sock *icsk = inet_csk(sk);
 
         if (!tp->packets_out)
                 goto out;
@@ -351,20 +318,21 @@ static void tcp_retransmit_timer(struct sock *sk)
         if (tcp_write_timeout(sk))
                 goto out;
 
-        if (tp->retransmits == 0) {
-                if (tp->ca_state == TCP_CA_Disorder || tp->ca_state == TCP_CA_Recovery) {
+        if (icsk->icsk_retransmits == 0) {
+                if (icsk->icsk_ca_state == TCP_CA_Disorder ||
+                    icsk->icsk_ca_state == TCP_CA_Recovery) {
                         if (tp->rx_opt.sack_ok) {
-                                if (tp->ca_state == TCP_CA_Recovery)
+                                if (icsk->icsk_ca_state == TCP_CA_Recovery)
                                         NET_INC_STATS_BH(LINUX_MIB_TCPSACKRECOVERYFAIL);
                                 else
                                         NET_INC_STATS_BH(LINUX_MIB_TCPSACKFAILURES);
                         } else {
-                                if (tp->ca_state == TCP_CA_Recovery)
+                                if (icsk->icsk_ca_state == TCP_CA_Recovery)
                                         NET_INC_STATS_BH(LINUX_MIB_TCPRENORECOVERYFAIL);
                                 else
                                         NET_INC_STATS_BH(LINUX_MIB_TCPRENOFAILURES);
                         }
-                } else if (tp->ca_state == TCP_CA_Loss) {
+                } else if (icsk->icsk_ca_state == TCP_CA_Loss) {
                         NET_INC_STATS_BH(LINUX_MIB_TCPLOSSFAILURES);
                 } else {
                         NET_INC_STATS_BH(LINUX_MIB_TCPTIMEOUTS);
@@ -381,10 +349,11 @@ static void tcp_retransmit_timer(struct sock *sk)
                 /* Retransmission failed because of local congestion,
                  * do not backoff.
                  */
-                if (!tp->retransmits)
-                        tp->retransmits=1;
-                tcp_reset_xmit_timer(sk, TCP_TIME_RETRANS,
-                                     min(tp->rto, TCP_RESOURCE_PROBE_INTERVAL));
+                if (!icsk->icsk_retransmits)
+                        icsk->icsk_retransmits = 1;
+                inet_csk_reset_xmit_timer(sk, ICSK_TIME_RETRANS,
+                                          min(icsk->icsk_rto, TCP_RESOURCE_PROBE_INTERVAL),
+                                          TCP_RTO_MAX);
                 goto out;
         }
 
@@ -403,13 +372,13 @@ static void tcp_retransmit_timer(struct sock *sk)
          * implemented ftp to mars will work nicely. We will have to fix
          * the 120 second clamps though!
          */
-        tp->backoff++;
-        tp->retransmits++;
+        icsk->icsk_backoff++;
+        icsk->icsk_retransmits++;
 
 out_reset_timer:
-        tp->rto = min(tp->rto << 1, TCP_RTO_MAX);
-        tcp_reset_xmit_timer(sk, TCP_TIME_RETRANS, tp->rto);
-        if (tp->retransmits > sysctl_tcp_retries1)
+        icsk->icsk_rto = min(icsk->icsk_rto << 1, TCP_RTO_MAX);
+        inet_csk_reset_xmit_timer(sk, ICSK_TIME_RETRANS, icsk->icsk_rto, TCP_RTO_MAX);
+        if (icsk->icsk_retransmits > sysctl_tcp_retries1)
                 __sk_dst_reset(sk);
 
 out:;
@@ -418,32 +387,32 @@ out:;
 static void tcp_write_timer(unsigned long data)
 {
         struct sock *sk = (struct sock*)data;
-        struct tcp_sock *tp = tcp_sk(sk);
+        struct inet_connection_sock *icsk = inet_csk(sk);
         int event;
 
         bh_lock_sock(sk);
         if (sock_owned_by_user(sk)) {
                 /* Try again later */
-                sk_reset_timer(sk, &tp->retransmit_timer, jiffies + (HZ / 20));
+                sk_reset_timer(sk, &icsk->icsk_retransmit_timer, jiffies + (HZ / 20));
                 goto out_unlock;
         }
 
-        if (sk->sk_state == TCP_CLOSE || !tp->pending)
+        if (sk->sk_state == TCP_CLOSE || !icsk->icsk_pending)
                 goto out;
 
-        if (time_after(tp->timeout, jiffies)) {
-                sk_reset_timer(sk, &tp->retransmit_timer, tp->timeout);
+        if (time_after(icsk->icsk_timeout, jiffies)) {
+                sk_reset_timer(sk, &icsk->icsk_retransmit_timer, icsk->icsk_timeout);
                 goto out;
         }
 
-        event = tp->pending;
-        tp->pending = 0;
+        event = icsk->icsk_pending;
+        icsk->icsk_pending = 0;
 
         switch (event) {
-        case TCP_TIME_RETRANS:
+        case ICSK_TIME_RETRANS:
                 tcp_retransmit_timer(sk);
                 break;
-        case TCP_TIME_PROBE0:
+        case ICSK_TIME_PROBE0:
                 tcp_probe_timer(sk);
                 break;
         }
@@ -462,96 +431,8 @@ out_unlock:
 
 static void tcp_synack_timer(struct sock *sk)
 {
-        struct tcp_sock *tp = tcp_sk(sk);
-        struct listen_sock *lopt = tp->accept_queue.listen_opt;
-        int max_retries = tp->syn_retries ? : sysctl_tcp_synack_retries;
-        int thresh = max_retries;
-        unsigned long now = jiffies;
-        struct request_sock **reqp, *req;
-        int i, budget;
-
-        if (lopt == NULL || lopt->qlen == 0)
-                return;
-
-        /* Normally all the openreqs are young and become mature
-         * (i.e. converted to established socket) for first timeout.
-         * If synack was not acknowledged for 3 seconds, it means
-         * one of the following things: synack was lost, ack was lost,
-         * rtt is high or nobody planned to ack (i.e. synflood).
-         * When server is a bit loaded, queue is populated with old
-         * open requests, reducing effective size of queue.
-         * When server is well loaded, queue size reduces to zero
-         * after several minutes of work. It is not synflood,
-         * it is normal operation. The solution is pruning
-         * too old entries overriding normal timeout, when
-         * situation becomes dangerous.
-         *
-         * Essentially, we reserve half of room for young
-         * embrions; and abort old ones without pity, if old
-         * ones are about to clog our table.
-         */
-        if (lopt->qlen>>(lopt->max_qlen_log-1)) {
-                int young = (lopt->qlen_young<<1);
-
-                while (thresh > 2) {
-                        if (lopt->qlen < young)
-                                break;
-                        thresh--;
-                        young <<= 1;
-                }
-        }
-
-        if (tp->defer_accept)
-                max_retries = tp->defer_accept;
-
-        budget = 2*(TCP_SYNQ_HSIZE/(TCP_TIMEOUT_INIT/TCP_SYNQ_INTERVAL));
-        i = lopt->clock_hand;
-
-        do {
-                reqp=&lopt->syn_table[i];
-                while ((req = *reqp) != NULL) {
-                        if (time_after_eq(now, req->expires)) {
-                                if ((req->retrans < thresh ||
-                                     (inet_rsk(req)->acked && req->retrans < max_retries))
-                                    && !req->rsk_ops->rtx_syn_ack(sk, req, NULL)) {
-                                        unsigned long timeo;
-
-                                        if (req->retrans++ == 0)
-                                                lopt->qlen_young--;
-                                        timeo = min((TCP_TIMEOUT_INIT << req->retrans),
-                                                    TCP_RTO_MAX);
-                                        req->expires = now + timeo;
-                                        reqp = &req->dl_next;
-                                        continue;
-                                }
-
-                                /* Drop this request */
-                                tcp_synq_unlink(tp, req, reqp);
-                                reqsk_queue_removed(&tp->accept_queue, req);
-                                reqsk_free(req);
-                                continue;
-                        }
-                        reqp = &req->dl_next;
-                }
-
-                i = (i+1)&(TCP_SYNQ_HSIZE-1);
-
-        } while (--budget > 0);
-
-        lopt->clock_hand = i;
-
-        if (lopt->qlen)
-                tcp_reset_keepalive_timer(sk, TCP_SYNQ_INTERVAL);
-}
-
-void tcp_delete_keepalive_timer (struct sock *sk)
-{
-        sk_stop_timer(sk, &sk->sk_timer);
-}
-
-void tcp_reset_keepalive_timer (struct sock *sk, unsigned long len)
-{
-        sk_reset_timer(sk, &sk->sk_timer, jiffies + len);
+        inet_csk_reqsk_queue_prune(sk, TCP_SYNQ_INTERVAL,
+                                   TCP_TIMEOUT_INIT, TCP_RTO_MAX);
 }
 
 void tcp_set_keepalive(struct sock *sk, int val)
@@ -560,15 +441,16 @@ void tcp_set_keepalive(struct sock *sk, int val)
                 return;
 
         if (val && !sock_flag(sk, SOCK_KEEPOPEN))
-                tcp_reset_keepalive_timer(sk, keepalive_time_when(tcp_sk(sk)));
+                inet_csk_reset_keepalive_timer(sk, keepalive_time_when(tcp_sk(sk)));
         else if (!val)
-                tcp_delete_keepalive_timer(sk);
+                inet_csk_delete_keepalive_timer(sk);
 }
 
 
 static void tcp_keepalive_timer (unsigned long data)
 {
         struct sock *sk = (struct sock *) data;
+        struct inet_connection_sock *icsk = inet_csk(sk);
         struct tcp_sock *tp = tcp_sk(sk);
         __u32 elapsed;
 
@@ -576,7 +458,7 @@ static void tcp_keepalive_timer (unsigned long data)
         bh_lock_sock(sk);
         if (sock_owned_by_user(sk)) {
                 /* Try again later. */ 
-                tcp_reset_keepalive_timer (sk, HZ/20);
+                inet_csk_reset_keepalive_timer (sk, HZ/20);
                 goto out;
         }
 
@@ -587,7 +469,7 @@ static void tcp_keepalive_timer (unsigned long data)
 
         if (sk->sk_state == TCP_FIN_WAIT2 && sock_flag(sk, SOCK_DEAD)) {
                 if (tp->linger2 >= 0) {
-                        int tmo = tcp_fin_time(tp) - TCP_TIMEWAIT_LEN;
+                        const int tmo = tcp_fin_time(sk) - TCP_TIMEWAIT_LEN;
 
                         if (tmo > 0) {
                                 tcp_time_wait(sk, TCP_FIN_WAIT2, tmo);
@@ -610,14 +492,14 @@ static void tcp_keepalive_timer (unsigned long data)
         elapsed = tcp_time_stamp - tp->rcv_tstamp;
 
         if (elapsed >= keepalive_time_when(tp)) {
-                if ((!tp->keepalive_probes && tp->probes_out >= sysctl_tcp_keepalive_probes) ||
-                     (tp->keepalive_probes && tp->probes_out >= tp->keepalive_probes)) {
+                if ((!tp->keepalive_probes && icsk->icsk_probes_out >= sysctl_tcp_keepalive_probes) ||
+                     (tp->keepalive_probes && icsk->icsk_probes_out >= tp->keepalive_probes)) {
                         tcp_send_active_reset(sk, GFP_ATOMIC);
                         tcp_write_err(sk);
                         goto out;
                 }
                 if (tcp_write_wakeup(sk) <= 0) {
-                        tp->probes_out++;
+                        icsk->icsk_probes_out++;
                         elapsed = keepalive_intvl_when(tp);
                 } else {
                         /* If keepalive was lost due to local congestion,
@@ -634,7 +516,7 @@ static void tcp_keepalive_timer (unsigned long data)
         sk_stream_mem_reclaim(sk);
 
 resched:
-        tcp_reset_keepalive_timer (sk, elapsed);
+        inet_csk_reset_keepalive_timer (sk, elapsed);
         goto out;
 
 death:  
@@ -644,8 +526,3 @@ out:
         bh_unlock_sock(sk);
         sock_put(sk);
 }
-
-EXPORT_SYMBOL(tcp_clear_xmit_timers);
-EXPORT_SYMBOL(tcp_delete_keepalive_timer);
-EXPORT_SYMBOL(tcp_init_xmit_timers);
-EXPORT_SYMBOL(tcp_reset_keepalive_timer);