[TIMEWAIT]: Move inet_timewait_death_row routines to net/ipv4/inet_timewait_sock.c

Also export the ones that will be used in the next changeset, when
DCCP uses this infrastructure.
Signed-off-by: Arnaldo Carvalho de Melo <acme@mandriva.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

include/net/inet_timewait_sock.h

@@ -82,6 +82,10 @@ struct inet_timewait_death_row {
 	int			sysctl_max_tw_buckets;
 };
 
+extern void inet_twdr_hangman(unsigned long data);
+extern void inet_twdr_twkill_work(void *data);
+extern void inet_twdr_twcal_tick(unsigned long data);
+
 #if (BITS_PER_LONG == 64)
 #define INET_TIMEWAIT_ADDRCMP_ALIGN_BYTES 8
 #else
@@ -206,4 +210,10 @@ extern void __inet_twsk_kill(struct inet_timewait_sock *tw,
 extern void __inet_twsk_hashdance(struct inet_timewait_sock *tw,
 				  struct sock *sk,
 				  struct inet_hashinfo *hashinfo);
+
+extern void inet_twsk_schedule(struct inet_timewait_sock *tw,
+			       struct inet_timewait_death_row *twdr,
+			       const int timeo, const int timewait_len);
+extern void inet_twsk_deschedule(struct inet_timewait_sock *tw,
+				 struct inet_timewait_death_row *twdr);
 #endif	/* _INET_TIMEWAIT_SOCK_ */

include/net/tcp.h

@@ -44,8 +44,6 @@ extern struct inet_hashinfo tcp_hashinfo;
 
 extern atomic_t tcp_orphan_count;
 extern void tcp_time_wait(struct sock *sk, int state, int timeo);
-extern void inet_twsk_deschedule(struct inet_timewait_sock *tw,
-				 struct inet_timewait_death_row *twdr);
 
 #define MAX_TCP_HEADER	(128 + MAX_HEADER)
 

net/ipv4/inet_timewait_sock.c

@@ -12,6 +12,7 @@
 
 #include <net/inet_hashtables.h>
 #include <net/inet_timewait_sock.h>
+#include <net/ip.h>
 
 /* Must be called with locally disabled BHs. */
 void __inet_twsk_kill(struct inet_timewait_sock *tw, struct inet_hashinfo *hashinfo)
@@ -85,6 +86,8 @@ void __inet_twsk_hashdance(struct inet_timewait_sock *tw, struct sock *sk,
 	write_unlock(&ehead->lock);
 }
 
+EXPORT_SYMBOL_GPL(__inet_twsk_hashdance);
+
 struct inet_timewait_sock *inet_twsk_alloc(const struct sock *sk, const int state)
 {
 	struct inet_timewait_sock *tw = kmem_cache_alloc(sk->sk_prot_creator->twsk_slab,
@@ -112,3 +115,270 @@ struct inet_timewait_sock *inet_twsk_alloc(const struct sock *sk, const int stat
 
 	return tw;
 }
+
+EXPORT_SYMBOL_GPL(inet_twsk_alloc);
+
+/* Returns non-zero if quota exceeded.  */
+static int inet_twdr_do_twkill_work(struct inet_timewait_death_row *twdr,
+				    const int slot)
+{
+	struct inet_timewait_sock *tw;
+	struct hlist_node *node;
+	unsigned int killed;
+	int ret;
+
+	/* NOTE: compare this to previous version where lock
+	 * was released after detaching chain. It was racy,
+	 * because tw buckets are scheduled in not serialized context
+	 * in 2.3 (with netfilter), and with softnet it is common, because
+	 * soft irqs are not sequenced.
+	 */
+	killed = 0;
+	ret = 0;
+rescan:
+	inet_twsk_for_each_inmate(tw, node, &twdr->cells[slot]) {
+		__inet_twsk_del_dead_node(tw);
+		spin_unlock(&twdr->death_lock);
+		__inet_twsk_kill(tw, twdr->hashinfo);
+		inet_twsk_put(tw);
+		killed++;
+		spin_lock(&twdr->death_lock);
+		if (killed > INET_TWDR_TWKILL_QUOTA) {
+			ret = 1;
+			break;
+		}
+
+		/* While we dropped twdr->death_lock, another cpu may have
+		 * killed off the next TW bucket in the list, therefore
+		 * do a fresh re-read of the hlist head node with the
+		 * lock reacquired.  We still use the hlist traversal
+		 * macro in order to get the prefetches.
+		 */
+		goto rescan;
+	}
+
+	twdr->tw_count -= killed;
+	NET_ADD_STATS_BH(LINUX_MIB_TIMEWAITED, killed);
+
+	return ret;
+}
+
+void inet_twdr_hangman(unsigned long data)
+{
+	struct inet_timewait_death_row *twdr;
+	int unsigned need_timer;
+
+	twdr = (struct inet_timewait_death_row *)data;
+	spin_lock(&twdr->death_lock);
+
+	if (twdr->tw_count == 0)
+		goto out;
+
+	need_timer = 0;
+	if (inet_twdr_do_twkill_work(twdr, twdr->slot)) {
+		twdr->thread_slots |= (1 << twdr->slot);
+		mb();
+		schedule_work(&twdr->twkill_work);
+		need_timer = 1;
+	} else {
+		/* We purged the entire slot, anything left?  */
+		if (twdr->tw_count)
+			need_timer = 1;
+	}
+	twdr->slot = ((twdr->slot + 1) & (INET_TWDR_TWKILL_SLOTS - 1));
+	if (need_timer)
+		mod_timer(&twdr->tw_timer, jiffies + twdr->period);
+out:
+	spin_unlock(&twdr->death_lock);
+}
+
+EXPORT_SYMBOL_GPL(inet_twdr_hangman);
+
+extern void twkill_slots_invalid(void);
+
+void inet_twdr_twkill_work(void *data)
+{
+	struct inet_timewait_death_row *twdr = data;
+	int i;
+
+	if ((INET_TWDR_TWKILL_SLOTS - 1) > (sizeof(twdr->thread_slots) * 8))
+		twkill_slots_invalid();
+
+	while (twdr->thread_slots) {
+		spin_lock_bh(&twdr->death_lock);
+		for (i = 0; i < INET_TWDR_TWKILL_SLOTS; i++) {
+			if (!(twdr->thread_slots & (1 << i)))
+				continue;
+
+			while (inet_twdr_do_twkill_work(twdr, i) != 0) {
+				if (need_resched()) {
+					spin_unlock_bh(&twdr->death_lock);
+					schedule();
+					spin_lock_bh(&twdr->death_lock);
+				}
+			}
+
+			twdr->thread_slots &= ~(1 << i);
+		}
+		spin_unlock_bh(&twdr->death_lock);
+	}
+}
+
+EXPORT_SYMBOL_GPL(inet_twdr_twkill_work);
+
+/* These are always called from BH context.  See callers in
+ * tcp_input.c to verify this.
+ */
+
+/* This is for handling early-kills of TIME_WAIT sockets. */
+void inet_twsk_deschedule(struct inet_timewait_sock *tw,
+			  struct inet_timewait_death_row *twdr)
+{
+	spin_lock(&twdr->death_lock);
+	if (inet_twsk_del_dead_node(tw)) {
+		inet_twsk_put(tw);
+		if (--twdr->tw_count == 0)
+			del_timer(&twdr->tw_timer);
+	}
+	spin_unlock(&twdr->death_lock);
+	__inet_twsk_kill(tw, twdr->hashinfo);
+}
+
+EXPORT_SYMBOL(inet_twsk_deschedule);
+
+void inet_twsk_schedule(struct inet_timewait_sock *tw,
+		       struct inet_timewait_death_row *twdr,
+		       const int timeo, const int timewait_len)
+{
+	struct hlist_head *list;
+	int slot;
+
+	/* timeout := RTO * 3.5
+	 *
+	 * 3.5 = 1+2+0.5 to wait for two retransmits.
+	 *
+	 * RATIONALE: if FIN arrived and we entered TIME-WAIT state,
+	 * our ACK acking that FIN can be lost. If N subsequent retransmitted
+	 * FINs (or previous seqments) are lost (probability of such event
+	 * is p^(N+1), where p is probability to lose single packet and
+	 * time to detect the loss is about RTO*(2^N - 1) with exponential
+	 * backoff). Normal timewait length is calculated so, that we
+	 * waited at least for one retransmitted FIN (maximal RTO is 120sec).
+	 * [ BTW Linux. following BSD, violates this requirement waiting
+	 *   only for 60sec, we should wait at least for 240 secs.
+	 *   Well, 240 consumes too much of resources 8)
+	 * ]
+	 * This interval is not reduced to catch old duplicate and
+	 * responces to our wandering segments living for two MSLs.
+	 * However, if we use PAWS to detect
+	 * old duplicates, we can reduce the interval to bounds required
+	 * by RTO, rather than MSL. So, if peer understands PAWS, we
+	 * kill tw bucket after 3.5*RTO (it is important that this number
+	 * is greater than TS tick!) and detect old duplicates with help
+	 * of PAWS.
+	 */
+	slot = (timeo + (1 << INET_TWDR_RECYCLE_TICK) - 1) >> INET_TWDR_RECYCLE_TICK;
+
+	spin_lock(&twdr->death_lock);
+
+	/* Unlink it, if it was scheduled */
+	if (inet_twsk_del_dead_node(tw))
+		twdr->tw_count--;
+	else
+		atomic_inc(&tw->tw_refcnt);
+
+	if (slot >= INET_TWDR_RECYCLE_SLOTS) {
+		/* Schedule to slow timer */
+		if (timeo >= timewait_len) {
+			slot = INET_TWDR_TWKILL_SLOTS - 1;
+		} else {
+			slot = (timeo + twdr->period - 1) / twdr->period;
+			if (slot >= INET_TWDR_TWKILL_SLOTS)
+				slot = INET_TWDR_TWKILL_SLOTS - 1;
+		}
+		tw->tw_ttd = jiffies + timeo;
+		slot = (twdr->slot + slot) & (INET_TWDR_TWKILL_SLOTS - 1);
+		list = &twdr->cells[slot];
+	} else {
+		tw->tw_ttd = jiffies + (slot << INET_TWDR_RECYCLE_TICK);
+
+		if (twdr->twcal_hand < 0) {
+			twdr->twcal_hand = 0;
+			twdr->twcal_jiffie = jiffies;
+			twdr->twcal_timer.expires = twdr->twcal_jiffie +
+					      (slot << INET_TWDR_RECYCLE_TICK);
+			add_timer(&twdr->twcal_timer);
+		} else {
+			if (time_after(twdr->twcal_timer.expires,
+				       jiffies + (slot << INET_TWDR_RECYCLE_TICK)))
+				mod_timer(&twdr->twcal_timer,
+					  jiffies + (slot << INET_TWDR_RECYCLE_TICK));
+			slot = (twdr->twcal_hand + slot) & (INET_TWDR_RECYCLE_SLOTS - 1);
+		}
+		list = &twdr->twcal_row[slot];
+	}
+
+	hlist_add_head(&tw->tw_death_node, list);
+
+	if (twdr->tw_count++ == 0)
+		mod_timer(&twdr->tw_timer, jiffies + twdr->period);
+	spin_unlock(&twdr->death_lock);
+}
+
+EXPORT_SYMBOL_GPL(inet_twsk_schedule);
+
+void inet_twdr_twcal_tick(unsigned long data)
+{
+	struct inet_timewait_death_row *twdr;
+	int n, slot;
+	unsigned long j;
+	unsigned long now = jiffies;
+	int killed = 0;
+	int adv = 0;
+
+	twdr = (struct inet_timewait_death_row *)data;
+
+	spin_lock(&twdr->death_lock);
+	if (twdr->twcal_hand < 0)
+		goto out;
+
+	slot = twdr->twcal_hand;
+	j = twdr->twcal_jiffie;
+
+	for (n = 0; n < INET_TWDR_RECYCLE_SLOTS; n++) {
+		if (time_before_eq(j, now)) {
+			struct hlist_node *node, *safe;
+			struct inet_timewait_sock *tw;
+
+			inet_twsk_for_each_inmate_safe(tw, node, safe,
+						       &twdr->twcal_row[slot]) {
+				__inet_twsk_del_dead_node(tw);
+				__inet_twsk_kill(tw, twdr->hashinfo);
+				inet_twsk_put(tw);
+				killed++;
+			}
+		} else {
+			if (!adv) {
+				adv = 1;
+				twdr->twcal_jiffie = j;
+				twdr->twcal_hand = slot;
+			}
+
+			if (!hlist_empty(&twdr->twcal_row[slot])) {
+				mod_timer(&twdr->twcal_timer, j);
+				goto out;
+			}
+		}
+		j += 1 << INET_TWDR_RECYCLE_TICK;
+		slot = (slot + 1) & (INET_TWDR_RECYCLE_SLOTS - 1);
+	}
+	twdr->twcal_hand = -1;
+
+out:
+	if ((twdr->tw_count -= killed) == 0)
+		del_timer(&twdr->tw_timer);
+	NET_ADD_STATS_BH(LINUX_MIB_TIMEWAITKILLED, killed);
+	spin_unlock(&twdr->death_lock);
+}
+
+EXPORT_SYMBOL_GPL(inet_twdr_twcal_tick);

net/ipv4/tcp_minisocks.c

@@ -35,12 +35,6 @@
 #define SYNC_INIT 1
 #endif
 
-/* New-style handling of TIME_WAIT sockets. */
-
-static void inet_twdr_hangman(unsigned long data);
-static void inet_twdr_twkill_work(void *data);
-static void inet_twdr_twcal_tick(unsigned long data);
-
 int sysctl_tcp_syncookies = SYNC_INIT; 
 int sysctl_tcp_abort_on_overflow;
 
@@ -63,10 +57,6 @@ struct inet_timewait_death_row tcp_death_row = {
 
 EXPORT_SYMBOL_GPL(tcp_death_row);
 
-static void inet_twsk_schedule(struct inet_timewait_sock *tw,
-			       struct inet_timewait_death_row *twdr,
-			       const int timeo);
-
 static __inline__ int tcp_in_window(u32 seq, u32 end_seq, u32 s_win, u32 e_win)
 {
 	if (seq == s_win)
@@ -173,9 +163,11 @@ kill_with_rst:
 		if (tw->tw_family == AF_INET &&
 		    tcp_death_row.sysctl_tw_recycle && tcptw->tw_ts_recent_stamp &&
 		    tcp_v4_tw_remember_stamp(tw))
-			inet_twsk_schedule(tw, &tcp_death_row, tw->tw_timeout);
+			inet_twsk_schedule(tw, &tcp_death_row, tw->tw_timeout,
+					   TCP_TIMEWAIT_LEN);
 		else
-			inet_twsk_schedule(tw, &tcp_death_row, TCP_TIMEWAIT_LEN);
+			inet_twsk_schedule(tw, &tcp_death_row, TCP_TIMEWAIT_LEN,
+					   TCP_TIMEWAIT_LEN);
 		return TCP_TW_ACK;
 	}
 
@@ -213,7 +205,8 @@ kill:
 				return TCP_TW_SUCCESS;
 			}
 		}
-		inet_twsk_schedule(tw, &tcp_death_row, TCP_TIMEWAIT_LEN);
+		inet_twsk_schedule(tw, &tcp_death_row, TCP_TIMEWAIT_LEN,
+				   TCP_TIMEWAIT_LEN);
 
 		if (tmp_opt.saw_tstamp) {
 			tcptw->tw_ts_recent	  = tmp_opt.rcv_tsval;
@@ -263,7 +256,8 @@ kill:
 		 * Do not reschedule in the last case.
 		 */
 		if (paws_reject || th->ack)
-			inet_twsk_schedule(tw, &tcp_death_row, TCP_TIMEWAIT_LEN);
+			inet_twsk_schedule(tw, &tcp_death_row, TCP_TIMEWAIT_LEN,
+					   TCP_TIMEWAIT_LEN);
 
 		/* Send ACK. Note, we do not put the bucket,
 		 * it will be released by caller.
@@ -326,7 +320,8 @@ void tcp_time_wait(struct sock *sk, int state, int timeo)
 				timeo = TCP_TIMEWAIT_LEN;
 		}
 
-		inet_twsk_schedule(tw, &tcp_death_row, timeo);
+		inet_twsk_schedule(tw, &tcp_death_row, timeo,
+				   TCP_TIMEWAIT_LEN);
 		inet_twsk_put(tw);
 	} else {
 		/* Sorry, if we're out of memory, just CLOSE this
@@ -341,261 +336,6 @@ void tcp_time_wait(struct sock *sk, int state, int timeo)
 	tcp_done(sk);
 }
 
-/* Returns non-zero if quota exceeded.  */
-static int inet_twdr_do_twkill_work(struct inet_timewait_death_row *twdr,
-				    const int slot)
-{
-	struct inet_timewait_sock *tw;
-	struct hlist_node *node;
-	unsigned int killed;
-	int ret;
-
-	/* NOTE: compare this to previous version where lock
-	 * was released after detaching chain. It was racy,
-	 * because tw buckets are scheduled in not serialized context
-	 * in 2.3 (with netfilter), and with softnet it is common, because
-	 * soft irqs are not sequenced.
-	 */
-	killed = 0;
-	ret = 0;
-rescan:
-	inet_twsk_for_each_inmate(tw, node, &twdr->cells[slot]) {
-		__inet_twsk_del_dead_node(tw);
-		spin_unlock(&twdr->death_lock);
-		__inet_twsk_kill(tw, twdr->hashinfo);
-		inet_twsk_put(tw);
-		killed++;
-		spin_lock(&twdr->death_lock);
-		if (killed > INET_TWDR_TWKILL_QUOTA) {
-			ret = 1;
-			break;
-		}
-
-		/* While we dropped twdr->death_lock, another cpu may have
-		 * killed off the next TW bucket in the list, therefore
-		 * do a fresh re-read of the hlist head node with the
-		 * lock reacquired.  We still use the hlist traversal
-		 * macro in order to get the prefetches.
-		 */
-		goto rescan;
-	}
-
-	twdr->tw_count -= killed;
-	NET_ADD_STATS_BH(LINUX_MIB_TIMEWAITED, killed);
-
-	return ret;
-}
-
-static void inet_twdr_hangman(unsigned long data)
-{
-	struct inet_timewait_death_row *twdr;
-	int unsigned need_timer;
-
-	twdr = (struct inet_timewait_death_row *)data;
-	spin_lock(&twdr->death_lock);
-
-	if (twdr->tw_count == 0)
-		goto out;
-
-	need_timer = 0;
-	if (inet_twdr_do_twkill_work(twdr, twdr->slot)) {
-		twdr->thread_slots |= (1 << twdr->slot);
-		mb();
-		schedule_work(&twdr->twkill_work);
-		need_timer = 1;
-	} else {
-		/* We purged the entire slot, anything left?  */
-		if (twdr->tw_count)
-			need_timer = 1;
-	}
-	twdr->slot = ((twdr->slot + 1) & (INET_TWDR_TWKILL_SLOTS - 1));
-	if (need_timer)
-		mod_timer(&twdr->tw_timer, jiffies + twdr->period);
-out:
-	spin_unlock(&twdr->death_lock);
-}
-
-extern void twkill_slots_invalid(void);
-
-static void inet_twdr_twkill_work(void *data)
-{
-	struct inet_timewait_death_row *twdr = data;
-	int i;
-
-	if ((INET_TWDR_TWKILL_SLOTS - 1) > (sizeof(twdr->thread_slots) * 8))
-		twkill_slots_invalid();
-
-	while (twdr->thread_slots) {
-		spin_lock_bh(&twdr->death_lock);
-		for (i = 0; i < INET_TWDR_TWKILL_SLOTS; i++) {
-			if (!(twdr->thread_slots & (1 << i)))
-				continue;
-
-			while (inet_twdr_do_twkill_work(twdr, i) != 0) {
-				if (need_resched()) {
-					spin_unlock_bh(&twdr->death_lock);
-					schedule();
-					spin_lock_bh(&twdr->death_lock);
-				}
-			}
-
-			twdr->thread_slots &= ~(1 << i);
-		}
-		spin_unlock_bh(&twdr->death_lock);
-	}
-}
-
-/* These are always called from BH context.  See callers in
- * tcp_input.c to verify this.
- */
-
-/* This is for handling early-kills of TIME_WAIT sockets. */
-void inet_twsk_deschedule(struct inet_timewait_sock *tw,
-			  struct inet_timewait_death_row *twdr)
-{
-	spin_lock(&twdr->death_lock);
-	if (inet_twsk_del_dead_node(tw)) {
-		inet_twsk_put(tw);
-		if (--twdr->tw_count == 0)
-			del_timer(&twdr->tw_timer);
-	}
-	spin_unlock(&twdr->death_lock);
-	__inet_twsk_kill(tw, twdr->hashinfo);
-}
-
-static void inet_twsk_schedule(struct inet_timewait_sock *tw,
-			       struct inet_timewait_death_row *twdr,
-			       const int timeo)
-{
-	struct hlist_head *list;
-	int slot;
-
-	/* timeout := RTO * 3.5
-	 *
-	 * 3.5 = 1+2+0.5 to wait for two retransmits.
-	 *
-	 * RATIONALE: if FIN arrived and we entered TIME-WAIT state,
-	 * our ACK acking that FIN can be lost. If N subsequent retransmitted
-	 * FINs (or previous seqments) are lost (probability of such event
-	 * is p^(N+1), where p is probability to lose single packet and
-	 * time to detect the loss is about RTO*(2^N - 1) with exponential
-	 * backoff). Normal timewait length is calculated so, that we
-	 * waited at least for one retransmitted FIN (maximal RTO is 120sec).
-	 * [ BTW Linux. following BSD, violates this requirement waiting
-	 *   only for 60sec, we should wait at least for 240 secs.
-	 *   Well, 240 consumes too much of resources 8)
-	 * ]
-	 * This interval is not reduced to catch old duplicate and
-	 * responces to our wandering segments living for two MSLs.
-	 * However, if we use PAWS to detect
-	 * old duplicates, we can reduce the interval to bounds required
-	 * by RTO, rather than MSL. So, if peer understands PAWS, we
-	 * kill tw bucket after 3.5*RTO (it is important that this number
-	 * is greater than TS tick!) and detect old duplicates with help
-	 * of PAWS.
-	 */
-	slot = (timeo + (1 << INET_TWDR_RECYCLE_TICK) - 1) >> INET_TWDR_RECYCLE_TICK;
-
-	spin_lock(&twdr->death_lock);
-
-	/* Unlink it, if it was scheduled */
-	if (inet_twsk_del_dead_node(tw))
-		twdr->tw_count--;
-	else
-		atomic_inc(&tw->tw_refcnt);
-
-	if (slot >= INET_TWDR_RECYCLE_SLOTS) {
-		/* Schedule to slow timer */
-		if (timeo >= TCP_TIMEWAIT_LEN) {
-			slot = INET_TWDR_TWKILL_SLOTS - 1;
-		} else {
-			slot = (timeo + twdr->period - 1) / twdr->period;
-			if (slot >= INET_TWDR_TWKILL_SLOTS)
-				slot = INET_TWDR_TWKILL_SLOTS - 1;
-		}
-		tw->tw_ttd = jiffies + timeo;
-		slot = (twdr->slot + slot) & (INET_TWDR_TWKILL_SLOTS - 1);
-		list = &twdr->cells[slot];
-	} else {
-		tw->tw_ttd = jiffies + (slot << INET_TWDR_RECYCLE_TICK);
-
-		if (twdr->twcal_hand < 0) {
-			twdr->twcal_hand = 0;
-			twdr->twcal_jiffie = jiffies;
-			twdr->twcal_timer.expires = twdr->twcal_jiffie +
-					      (slot << INET_TWDR_RECYCLE_TICK);
-			add_timer(&twdr->twcal_timer);
-		} else {
-			if (time_after(twdr->twcal_timer.expires,
-				       jiffies + (slot << INET_TWDR_RECYCLE_TICK)))
-				mod_timer(&twdr->twcal_timer,
-					  jiffies + (slot << INET_TWDR_RECYCLE_TICK));
-			slot = (twdr->twcal_hand + slot) & (INET_TWDR_RECYCLE_SLOTS - 1);
-		}
-		list = &twdr->twcal_row[slot];
-	}
-
-	hlist_add_head(&tw->tw_death_node, list);
-
-	if (twdr->tw_count++ == 0)
-		mod_timer(&twdr->tw_timer, jiffies + twdr->period);
-	spin_unlock(&twdr->death_lock);
-}
-
-void inet_twdr_twcal_tick(unsigned long data)
-{
-	struct inet_timewait_death_row *twdr;
-	int n, slot;
-	unsigned long j;
-	unsigned long now = jiffies;
-	int killed = 0;
-	int adv = 0;
-
-	twdr = (struct inet_timewait_death_row *)data;
-
-	spin_lock(&twdr->death_lock);
-	if (twdr->twcal_hand < 0)
-		goto out;
-
-	slot = twdr->twcal_hand;
-	j = twdr->twcal_jiffie;
-
-	for (n = 0; n < INET_TWDR_RECYCLE_SLOTS; n++) {
-		if (time_before_eq(j, now)) {
-			struct hlist_node *node, *safe;
-			struct inet_timewait_sock *tw;
-
-			inet_twsk_for_each_inmate_safe(tw, node, safe,
-						       &twdr->twcal_row[slot]) {
-				__inet_twsk_del_dead_node(tw);
-				__inet_twsk_kill(tw, twdr->hashinfo);
-				inet_twsk_put(tw);
-				killed++;
-			}
-		} else {
-			if (!adv) {
-				adv = 1;
-				twdr->twcal_jiffie = j;
-				twdr->twcal_hand = slot;
-			}
-
-			if (!hlist_empty(&twdr->twcal_row[slot])) {
-				mod_timer(&twdr->twcal_timer, j);
-				goto out;
-			}
-		}
-		j += 1 << INET_TWDR_RECYCLE_TICK;
-		slot = (slot + 1) & (INET_TWDR_RECYCLE_SLOTS - 1);
-	}
-	twdr->twcal_hand = -1;
-
-out:
-	if ((twdr->tw_count -= killed) == 0)
-		del_timer(&twdr->tw_timer);
-	NET_ADD_STATS_BH(LINUX_MIB_TIMEWAITKILLED, killed);
-	spin_unlock(&twdr->death_lock);
-}
-
 /* This is not only more efficient than what we used to do, it eliminates
  * a lot of code duplication between IPv4/IPv6 SYN recv processing. -DaveM
  *
@@ -933,4 +673,3 @@ EXPORT_SYMBOL(tcp_check_req);
 EXPORT_SYMBOL(tcp_child_process);
 EXPORT_SYMBOL(tcp_create_openreq_child);
 EXPORT_SYMBOL(tcp_timewait_state_process);
-EXPORT_SYMBOL(inet_twsk_deschedule);