1 files changed, 101 insertions, 504 deletions

diff --git a/net/ipv4/tcp_minisocks.c b/net/ipv4/tcp_minisocks.c
index f42a284164b7..b1a63b2c6b4a 100644
--- a/net/ipv4/tcp_minisocks.c
+++ b/net/ipv4/tcp_minisocks.c
@@ -35,13 +35,27 @@
 #define SYNC_INIT 1
 #endif
 
-int sysctl_tcp_tw_recycle;
-int sysctl_tcp_max_tw_buckets = NR_FILE*2;
-
 int sysctl_tcp_syncookies = SYNC_INIT; 
 int sysctl_tcp_abort_on_overflow;
 
-static void tcp_tw_schedule(struct tcp_tw_bucket *tw, int timeo);
+struct inet_timewait_death_row tcp_death_row = {
+	.sysctl_max_tw_buckets = NR_FILE * 2,
+	.period		= TCP_TIMEWAIT_LEN / INET_TWDR_TWKILL_SLOTS,
+	.death_lock	= SPIN_LOCK_UNLOCKED,
+	.hashinfo	= &tcp_hashinfo,
+	.tw_timer	= TIMER_INITIALIZER(inet_twdr_hangman, 0,
+					    (unsigned long)&tcp_death_row),
+	.twkill_work	= __WORK_INITIALIZER(tcp_death_row.twkill_work,
+					     inet_twdr_twkill_work,
+					     &tcp_death_row),
+/* Short-time timewait calendar */
+
+	.twcal_hand	= -1,
+	.twcal_timer	= TIMER_INITIALIZER(inet_twdr_twcal_tick, 0,
+					    (unsigned long)&tcp_death_row),
+};
+
+EXPORT_SYMBOL_GPL(tcp_death_row);
 
 static __inline__ int tcp_in_window(u32 seq, u32 end_seq, u32 s_win, u32 e_win)
 {
@@ -52,47 +66,6 @@ static __inline__ int tcp_in_window(u32 seq, u32 end_seq, u32 s_win, u32 e_win)
 	return (seq == e_win && seq == end_seq);
 }
 
-/* New-style handling of TIME_WAIT sockets. */
-
-int tcp_tw_count;
-
-
-/* Must be called with locally disabled BHs. */
-static void tcp_timewait_kill(struct tcp_tw_bucket *tw)
-{
-	struct tcp_ehash_bucket *ehead;
-	struct tcp_bind_hashbucket *bhead;
-	struct tcp_bind_bucket *tb;
-
-	/* Unlink from established hashes. */
-	ehead = &tcp_ehash[tw->tw_hashent];
-	write_lock(&ehead->lock);
-	if (hlist_unhashed(&tw->tw_node)) {
-		write_unlock(&ehead->lock);
-		return;
-	}
-	__hlist_del(&tw->tw_node);
-	sk_node_init(&tw->tw_node);
-	write_unlock(&ehead->lock);
-
-	/* Disassociate with bind bucket. */
-	bhead = &tcp_bhash[tcp_bhashfn(tw->tw_num)];
-	spin_lock(&bhead->lock);
-	tb = tw->tw_tb;
-	__hlist_del(&tw->tw_bind_node);
-	tw->tw_tb = NULL;
-	tcp_bucket_destroy(tb);
-	spin_unlock(&bhead->lock);
-
-#ifdef INET_REFCNT_DEBUG
-	if (atomic_read(&tw->tw_refcnt) != 1) {
-		printk(KERN_DEBUG "tw_bucket %p refcnt=%d\n", tw,
-		       atomic_read(&tw->tw_refcnt));
-	}
-#endif
-	tcp_tw_put(tw);
-}
-
 /* 
  * * Main purpose of TIME-WAIT state is to close connection gracefully,
  *   when one of ends sits in LAST-ACK or CLOSING retransmitting FIN
@@ -122,19 +95,20 @@ static void tcp_timewait_kill(struct tcp_tw_bucket *tw)
  * to avoid misread sequence numbers, states etc.  --ANK
  */
 enum tcp_tw_status
-tcp_timewait_state_process(struct tcp_tw_bucket *tw, struct sk_buff *skb,
-			   struct tcphdr *th, unsigned len)
+tcp_timewait_state_process(struct inet_timewait_sock *tw, struct sk_buff *skb,
+			   const struct tcphdr *th)
 {
+	struct tcp_timewait_sock *tcptw = tcp_twsk((struct sock *)tw);
 	struct tcp_options_received tmp_opt;
 	int paws_reject = 0;
 
 	tmp_opt.saw_tstamp = 0;
-	if (th->doff > (sizeof(struct tcphdr) >> 2) && tw->tw_ts_recent_stamp) {
+	if (th->doff > (sizeof(*th) >> 2) && tcptw->tw_ts_recent_stamp) {
 		tcp_parse_options(skb, &tmp_opt, 0);
 
 		if (tmp_opt.saw_tstamp) {
-			tmp_opt.ts_recent	   = tw->tw_ts_recent;
-			tmp_opt.ts_recent_stamp = tw->tw_ts_recent_stamp;
+			tmp_opt.ts_recent	= tcptw->tw_ts_recent;
+			tmp_opt.ts_recent_stamp	= tcptw->tw_ts_recent_stamp;
 			paws_reject = tcp_paws_check(&tmp_opt, th->rst);
 		}
 	}
@@ -145,20 +119,20 @@ tcp_timewait_state_process(struct tcp_tw_bucket *tw, struct sk_buff *skb,
 		/* Out of window, send ACK */
 		if (paws_reject ||
 		    !tcp_in_window(TCP_SKB_CB(skb)->seq, TCP_SKB_CB(skb)->end_seq,
-				   tw->tw_rcv_nxt,
-				   tw->tw_rcv_nxt + tw->tw_rcv_wnd))
+				   tcptw->tw_rcv_nxt,
+				   tcptw->tw_rcv_nxt + tcptw->tw_rcv_wnd))
 			return TCP_TW_ACK;
 
 		if (th->rst)
 			goto kill;
 
-		if (th->syn && !before(TCP_SKB_CB(skb)->seq, tw->tw_rcv_nxt))
+		if (th->syn && !before(TCP_SKB_CB(skb)->seq, tcptw->tw_rcv_nxt))
 			goto kill_with_rst;
 
 		/* Dup ACK? */
-		if (!after(TCP_SKB_CB(skb)->end_seq, tw->tw_rcv_nxt) ||
+		if (!after(TCP_SKB_CB(skb)->end_seq, tcptw->tw_rcv_nxt) ||
 		    TCP_SKB_CB(skb)->end_seq == TCP_SKB_CB(skb)->seq) {
-			tcp_tw_put(tw);
+			inet_twsk_put(tw);
 			return TCP_TW_SUCCESS;
 		}
 
@@ -166,19 +140,19 @@ tcp_timewait_state_process(struct tcp_tw_bucket *tw, struct sk_buff *skb,
 		 * reset.
 		 */
 		if (!th->fin ||
-		    TCP_SKB_CB(skb)->end_seq != tw->tw_rcv_nxt + 1) {
+		    TCP_SKB_CB(skb)->end_seq != tcptw->tw_rcv_nxt + 1) {
 kill_with_rst:
-			tcp_tw_deschedule(tw);
-			tcp_tw_put(tw);
+			inet_twsk_deschedule(tw, &tcp_death_row);
+			inet_twsk_put(tw);
 			return TCP_TW_RST;
 		}
 
 		/* FIN arrived, enter true time-wait state. */
-		tw->tw_substate	= TCP_TIME_WAIT;
-		tw->tw_rcv_nxt	= TCP_SKB_CB(skb)->end_seq;
+		tw->tw_substate	  = TCP_TIME_WAIT;
+		tcptw->tw_rcv_nxt = TCP_SKB_CB(skb)->end_seq;
 		if (tmp_opt.saw_tstamp) {
-			tw->tw_ts_recent_stamp	= xtime.tv_sec;
-			tw->tw_ts_recent	= tmp_opt.rcv_tsval;
+			tcptw->tw_ts_recent_stamp = xtime.tv_sec;
+			tcptw->tw_ts_recent	  = tmp_opt.rcv_tsval;
 		}
 
 		/* I am shamed, but failed to make it more elegant.
@@ -187,11 +161,13 @@ kill_with_rst:
 		 * do not undertsnad recycling in any case, it not
 		 * a big problem in practice. --ANK */
 		if (tw->tw_family == AF_INET &&
-		    sysctl_tcp_tw_recycle && tw->tw_ts_recent_stamp &&
+		    tcp_death_row.sysctl_tw_recycle && tcptw->tw_ts_recent_stamp &&
 		    tcp_v4_tw_remember_stamp(tw))
-			tcp_tw_schedule(tw, tw->tw_timeout);
+			inet_twsk_schedule(tw, &tcp_death_row, tw->tw_timeout,
+					   TCP_TIMEWAIT_LEN);
 		else
-			tcp_tw_schedule(tw, TCP_TIMEWAIT_LEN);
+			inet_twsk_schedule(tw, &tcp_death_row, TCP_TIMEWAIT_LEN,
+					   TCP_TIMEWAIT_LEN);
 		return TCP_TW_ACK;
 	}
 
@@ -213,7 +189,7 @@ kill_with_rst:
 	 */
 
 	if (!paws_reject &&
-	    (TCP_SKB_CB(skb)->seq == tw->tw_rcv_nxt &&
+	    (TCP_SKB_CB(skb)->seq == tcptw->tw_rcv_nxt &&
 	     (TCP_SKB_CB(skb)->seq == TCP_SKB_CB(skb)->end_seq || th->rst))) {
 		/* In window segment, it may be only reset or bare ack. */
 
@@ -224,19 +200,20 @@ kill_with_rst:
 			 */
 			if (sysctl_tcp_rfc1337 == 0) {
 kill:
-				tcp_tw_deschedule(tw);
-				tcp_tw_put(tw);
+				inet_twsk_deschedule(tw, &tcp_death_row);
+				inet_twsk_put(tw);
 				return TCP_TW_SUCCESS;
 			}
 		}
-		tcp_tw_schedule(tw, TCP_TIMEWAIT_LEN);
+		inet_twsk_schedule(tw, &tcp_death_row, TCP_TIMEWAIT_LEN,
+				   TCP_TIMEWAIT_LEN);
 
 		if (tmp_opt.saw_tstamp) {
-			tw->tw_ts_recent	= tmp_opt.rcv_tsval;
-			tw->tw_ts_recent_stamp	= xtime.tv_sec;
+			tcptw->tw_ts_recent	  = tmp_opt.rcv_tsval;
+			tcptw->tw_ts_recent_stamp = xtime.tv_sec;
 		}
 
-		tcp_tw_put(tw);
+		inet_twsk_put(tw);
 		return TCP_TW_SUCCESS;
 	}
 
@@ -258,9 +235,10 @@ kill:
 	 */
 
 	if (th->syn && !th->rst && !th->ack && !paws_reject &&
-	    (after(TCP_SKB_CB(skb)->seq, tw->tw_rcv_nxt) ||
-	     (tmp_opt.saw_tstamp && (s32)(tw->tw_ts_recent - tmp_opt.rcv_tsval) < 0))) {
-		u32 isn = tw->tw_snd_nxt + 65535 + 2;
+	    (after(TCP_SKB_CB(skb)->seq, tcptw->tw_rcv_nxt) ||
+	     (tmp_opt.saw_tstamp &&
+	      (s32)(tcptw->tw_ts_recent - tmp_opt.rcv_tsval) < 0))) {
+		u32 isn = tcptw->tw_snd_nxt + 65535 + 2;
 		if (isn == 0)
 			isn++;
 		TCP_SKB_CB(skb)->when = isn;
@@ -278,107 +256,57 @@ kill:
 		 * Do not reschedule in the last case.
 		 */
 		if (paws_reject || th->ack)
-			tcp_tw_schedule(tw, 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.
 		 */
 		return TCP_TW_ACK;
 	}
-	tcp_tw_put(tw);
+	inet_twsk_put(tw);
 	return TCP_TW_SUCCESS;
 }
 
-/* Enter the time wait state.  This is called with locally disabled BH.
- * Essentially we whip up a timewait bucket, copy the
- * relevant info into it from the SK, and mess with hash chains
- * and list linkage.
- */
-static void __tcp_tw_hashdance(struct sock *sk, struct tcp_tw_bucket *tw)
-{
-	struct tcp_ehash_bucket *ehead = &tcp_ehash[sk->sk_hashent];
-	struct tcp_bind_hashbucket *bhead;
-
-	/* Step 1: Put TW into bind hash. Original socket stays there too.
-	   Note, that any socket with inet_sk(sk)->num != 0 MUST be bound in
-	   binding cache, even if it is closed.
-	 */
-	bhead = &tcp_bhash[tcp_bhashfn(inet_sk(sk)->num)];
-	spin_lock(&bhead->lock);
-	tw->tw_tb = tcp_sk(sk)->bind_hash;
-	BUG_TRAP(tcp_sk(sk)->bind_hash);
-	tw_add_bind_node(tw, &tw->tw_tb->owners);
-	spin_unlock(&bhead->lock);
-
-	write_lock(&ehead->lock);
-
-	/* Step 2: Remove SK from established hash. */
-	if (__sk_del_node_init(sk))
-		sock_prot_dec_use(sk->sk_prot);
-
-	/* Step 3: Hash TW into TIMEWAIT half of established hash table. */
-	tw_add_node(tw, &(ehead + tcp_ehash_size)->chain);
-	atomic_inc(&tw->tw_refcnt);
-
-	write_unlock(&ehead->lock);
-}
-
 /* 
  * Move a socket to time-wait or dead fin-wait-2 state.
  */ 
 void tcp_time_wait(struct sock *sk, int state, int timeo)
 {
-	struct tcp_tw_bucket *tw = NULL;
-	struct tcp_sock *tp = tcp_sk(sk);
+	struct inet_timewait_sock *tw = NULL;
+	const struct tcp_sock *tp = tcp_sk(sk);
 	int recycle_ok = 0;
 
-	if (sysctl_tcp_tw_recycle && tp->rx_opt.ts_recent_stamp)
+	if (tcp_death_row.sysctl_tw_recycle && tp->rx_opt.ts_recent_stamp)
 		recycle_ok = tp->af_specific->remember_stamp(sk);
 
-	if (tcp_tw_count < sysctl_tcp_max_tw_buckets)
-		tw = kmem_cache_alloc(tcp_timewait_cachep, SLAB_ATOMIC);
-
-	if(tw != NULL) {
-		struct inet_sock *inet = inet_sk(sk);
-		int rto = (tp->rto<<2) - (tp->rto>>1);
-
-		/* Give us an identity. */
-		tw->tw_daddr		= inet->daddr;
-		tw->tw_rcv_saddr	= inet->rcv_saddr;
-		tw->tw_bound_dev_if	= sk->sk_bound_dev_if;
-		tw->tw_num		= inet->num;
-		tw->tw_state		= TCP_TIME_WAIT;
-		tw->tw_substate		= state;
-		tw->tw_sport		= inet->sport;
-		tw->tw_dport		= inet->dport;
-		tw->tw_family		= sk->sk_family;
-		tw->tw_reuse		= sk->sk_reuse;
-		tw->tw_rcv_wscale	= tp->rx_opt.rcv_wscale;
-		atomic_set(&tw->tw_refcnt, 1);
+	if (tcp_death_row.tw_count < tcp_death_row.sysctl_max_tw_buckets)
+		tw = inet_twsk_alloc(sk, state);
 
-		tw->tw_hashent		= sk->sk_hashent;
-		tw->tw_rcv_nxt		= tp->rcv_nxt;
-		tw->tw_snd_nxt		= tp->snd_nxt;
-		tw->tw_rcv_wnd		= tcp_receive_window(tp);
-		tw->tw_ts_recent	= tp->rx_opt.ts_recent;
-		tw->tw_ts_recent_stamp	= tp->rx_opt.ts_recent_stamp;
-		tw_dead_node_init(tw);
+	if (tw != NULL) {
+		struct tcp_timewait_sock *tcptw = tcp_twsk((struct sock *)tw);
+		const struct inet_connection_sock *icsk = inet_csk(sk);
+		const int rto = (icsk->icsk_rto << 2) - (icsk->icsk_rto >> 1);
+
+		tw->tw_rcv_wscale	= tp->rx_opt.rcv_wscale;
+		tcptw->tw_rcv_nxt	= tp->rcv_nxt;
+		tcptw->tw_snd_nxt	= tp->snd_nxt;
+		tcptw->tw_rcv_wnd	= tcp_receive_window(tp);
+		tcptw->tw_ts_recent	= tp->rx_opt.ts_recent;
+		tcptw->tw_ts_recent_stamp = tp->rx_opt.ts_recent_stamp;
 
 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
 		if (tw->tw_family == PF_INET6) {
 			struct ipv6_pinfo *np = inet6_sk(sk);
+			struct tcp6_timewait_sock *tcp6tw = tcp6_twsk((struct sock *)tw);
 
-			ipv6_addr_copy(&tw->tw_v6_daddr, &np->daddr);
-			ipv6_addr_copy(&tw->tw_v6_rcv_saddr, &np->rcv_saddr);
-			tw->tw_v6_ipv6only = np->ipv6only;
-		} else {
-			memset(&tw->tw_v6_daddr, 0, sizeof(tw->tw_v6_daddr));
-			memset(&tw->tw_v6_rcv_saddr, 0, sizeof(tw->tw_v6_rcv_saddr));
-			tw->tw_v6_ipv6only = 0;
+			ipv6_addr_copy(&tcp6tw->tw_v6_daddr, &np->daddr);
+			ipv6_addr_copy(&tcp6tw->tw_v6_rcv_saddr, &np->rcv_saddr);
+			tw->tw_ipv6only = np->ipv6only;
 		}
 #endif
 		/* Linkage updates. */
-		__tcp_tw_hashdance(sk, tw);
+		__inet_twsk_hashdance(tw, sk, &tcp_hashinfo);
 
 		/* Get the TIME_WAIT timeout firing. */
 		if (timeo < rto)
@@ -392,8 +320,9 @@ void tcp_time_wait(struct sock *sk, int state, int timeo)
 				timeo = TCP_TIMEWAIT_LEN;
 		}
 
-		tcp_tw_schedule(tw, timeo);
-		tcp_tw_put(tw);
+		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
 		 * socket up.  We've got bigger problems than
@@ -407,277 +336,6 @@ void tcp_time_wait(struct sock *sk, int state, int timeo)
 	tcp_done(sk);
 }
 
-/* Kill off TIME_WAIT sockets once their lifetime has expired. */
-static int tcp_tw_death_row_slot;
-
-static void tcp_twkill(unsigned long);
-
-/* TIME_WAIT reaping mechanism. */
-#define TCP_TWKILL_SLOTS	8	/* Please keep this a power of 2. */
-#define TCP_TWKILL_PERIOD	(TCP_TIMEWAIT_LEN/TCP_TWKILL_SLOTS)
-
-#define TCP_TWKILL_QUOTA	100
-
-static struct hlist_head tcp_tw_death_row[TCP_TWKILL_SLOTS];
-static DEFINE_SPINLOCK(tw_death_lock);
-static struct timer_list tcp_tw_timer = TIMER_INITIALIZER(tcp_twkill, 0, 0);
-static void twkill_work(void *);
-static DECLARE_WORK(tcp_twkill_work, twkill_work, NULL);
-static u32 twkill_thread_slots;
-
-/* Returns non-zero if quota exceeded.  */
-static int tcp_do_twkill_work(int slot, unsigned int quota)
-{
-	struct tcp_tw_bucket *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:
-	tw_for_each_inmate(tw, node, &tcp_tw_death_row[slot]) {
-		__tw_del_dead_node(tw);
-		spin_unlock(&tw_death_lock);
-		tcp_timewait_kill(tw);
-		tcp_tw_put(tw);
-		killed++;
-		spin_lock(&tw_death_lock);
-		if (killed > quota) {
-			ret = 1;
-			break;
-		}
-
-		/* While we dropped tw_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;
-	}
-
-	tcp_tw_count -= killed;
-	NET_ADD_STATS_BH(LINUX_MIB_TIMEWAITED, killed);
-
-	return ret;
-}
-
-static void tcp_twkill(unsigned long dummy)
-{
-	int need_timer, ret;
-
-	spin_lock(&tw_death_lock);
-
-	if (tcp_tw_count == 0)
-		goto out;
-
-	need_timer = 0;
-	ret = tcp_do_twkill_work(tcp_tw_death_row_slot, TCP_TWKILL_QUOTA);
-	if (ret) {
-		twkill_thread_slots |= (1 << tcp_tw_death_row_slot);
-		mb();
-		schedule_work(&tcp_twkill_work);
-		need_timer = 1;
-	} else {
-		/* We purged the entire slot, anything left?  */
-		if (tcp_tw_count)
-			need_timer = 1;
-	}
-	tcp_tw_death_row_slot =
-		((tcp_tw_death_row_slot + 1) & (TCP_TWKILL_SLOTS - 1));
-	if (need_timer)
-		mod_timer(&tcp_tw_timer, jiffies + TCP_TWKILL_PERIOD);
-out:
-	spin_unlock(&tw_death_lock);
-}
-
-extern void twkill_slots_invalid(void);
-
-static void twkill_work(void *dummy)
-{
-	int i;
-
-	if ((TCP_TWKILL_SLOTS - 1) > (sizeof(twkill_thread_slots) * 8))
-		twkill_slots_invalid();
-
-	while (twkill_thread_slots) {
-		spin_lock_bh(&tw_death_lock);
-		for (i = 0; i < TCP_TWKILL_SLOTS; i++) {
-			if (!(twkill_thread_slots & (1 << i)))
-				continue;
-
-			while (tcp_do_twkill_work(i, TCP_TWKILL_QUOTA) != 0) {
-				if (need_resched()) {
-					spin_unlock_bh(&tw_death_lock);
-					schedule();
-					spin_lock_bh(&tw_death_lock);
-				}
-			}
-
-			twkill_thread_slots &= ~(1 << i);
-		}
-		spin_unlock_bh(&tw_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 tcp_tw_deschedule(struct tcp_tw_bucket *tw)
-{
-	spin_lock(&tw_death_lock);
-	if (tw_del_dead_node(tw)) {
-		tcp_tw_put(tw);
-		if (--tcp_tw_count == 0)
-			del_timer(&tcp_tw_timer);
-	}
-	spin_unlock(&tw_death_lock);
-	tcp_timewait_kill(tw);
-}
-
-/* Short-time timewait calendar */
-
-static int tcp_twcal_hand = -1;
-static int tcp_twcal_jiffie;
-static void tcp_twcal_tick(unsigned long);
-static struct timer_list tcp_twcal_timer =
-		TIMER_INITIALIZER(tcp_twcal_tick, 0, 0);
-static struct hlist_head tcp_twcal_row[TCP_TW_RECYCLE_SLOTS];
-
-static void tcp_tw_schedule(struct tcp_tw_bucket *tw, 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<<TCP_TW_RECYCLE_TICK) - 1) >> TCP_TW_RECYCLE_TICK;
-
-	spin_lock(&tw_death_lock);
-
-	/* Unlink it, if it was scheduled */
-	if (tw_del_dead_node(tw))
-		tcp_tw_count--;
-	else
-		atomic_inc(&tw->tw_refcnt);
-
-	if (slot >= TCP_TW_RECYCLE_SLOTS) {
-		/* Schedule to slow timer */
-		if (timeo >= TCP_TIMEWAIT_LEN) {
-			slot = TCP_TWKILL_SLOTS-1;
-		} else {
-			slot = (timeo + TCP_TWKILL_PERIOD-1) / TCP_TWKILL_PERIOD;
-			if (slot >= TCP_TWKILL_SLOTS)
-				slot = TCP_TWKILL_SLOTS-1;
-		}
-		tw->tw_ttd = jiffies + timeo;
-		slot = (tcp_tw_death_row_slot + slot) & (TCP_TWKILL_SLOTS - 1);
-		list = &tcp_tw_death_row[slot];
-	} else {
-		tw->tw_ttd = jiffies + (slot << TCP_TW_RECYCLE_TICK);
-
-		if (tcp_twcal_hand < 0) {
-			tcp_twcal_hand = 0;
-			tcp_twcal_jiffie = jiffies;
-			tcp_twcal_timer.expires = tcp_twcal_jiffie + (slot<<TCP_TW_RECYCLE_TICK);
-			add_timer(&tcp_twcal_timer);
-		} else {
-			if (time_after(tcp_twcal_timer.expires, jiffies + (slot<<TCP_TW_RECYCLE_TICK)))
-				mod_timer(&tcp_twcal_timer, jiffies + (slot<<TCP_TW_RECYCLE_TICK));
-			slot = (tcp_twcal_hand + slot)&(TCP_TW_RECYCLE_SLOTS-1);
-		}
-		list = &tcp_twcal_row[slot];
-	}
-
-	hlist_add_head(&tw->tw_death_node, list);
-
-	if (tcp_tw_count++ == 0)
-		mod_timer(&tcp_tw_timer, jiffies+TCP_TWKILL_PERIOD);
-	spin_unlock(&tw_death_lock);
-}
-
-void tcp_twcal_tick(unsigned long dummy)
-{
-	int n, slot;
-	unsigned long j;
-	unsigned long now = jiffies;
-	int killed = 0;
-	int adv = 0;
-
-	spin_lock(&tw_death_lock);
-	if (tcp_twcal_hand < 0)
-		goto out;
-
-	slot = tcp_twcal_hand;
-	j = tcp_twcal_jiffie;
-
-	for (n=0; n<TCP_TW_RECYCLE_SLOTS; n++) {
-		if (time_before_eq(j, now)) {
-			struct hlist_node *node, *safe;
-			struct tcp_tw_bucket *tw;
-
-			tw_for_each_inmate_safe(tw, node, safe,
-					   &tcp_twcal_row[slot]) {
-				__tw_del_dead_node(tw);
-				tcp_timewait_kill(tw);
-				tcp_tw_put(tw);
-				killed++;
-			}
-		} else {
-			if (!adv) {
-				adv = 1;
-				tcp_twcal_jiffie = j;
-				tcp_twcal_hand = slot;
-			}
-
-			if (!hlist_empty(&tcp_twcal_row[slot])) {
-				mod_timer(&tcp_twcal_timer, j);
-				goto out;
-			}
-		}
-		j += (1<<TCP_TW_RECYCLE_TICK);
-		slot = (slot+1)&(TCP_TW_RECYCLE_SLOTS-1);
-	}
-	tcp_twcal_hand = -1;
-
-out:
-	if ((tcp_tw_count -= killed) == 0)
-		del_timer(&tcp_tw_timer);
-	NET_ADD_STATS_BH(LINUX_MIB_TIMEWAITKILLED, killed);
-	spin_unlock(&tw_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
  *
@@ -686,75 +344,27 @@ out:
  */
 struct sock *tcp_create_openreq_child(struct sock *sk, struct request_sock *req, struct sk_buff *skb)
 {
-	/* allocate the newsk from the same slab of the master sock,
-	 * if not, at sk_free time we'll try to free it from the wrong
-	 * slabcache (i.e. is it TCPv4 or v6?), this is handled thru sk->sk_prot -acme */
-	struct sock *newsk = sk_alloc(PF_INET, GFP_ATOMIC, sk->sk_prot, 0);
+	struct sock *newsk = inet_csk_clone(sk, req, GFP_ATOMIC);
 
-	if(newsk != NULL) {
-		struct inet_request_sock *ireq = inet_rsk(req);
+	if (newsk != NULL) {
+		const struct inet_request_sock *ireq = inet_rsk(req);
 		struct tcp_request_sock *treq = tcp_rsk(req);
+		struct inet_connection_sock *newicsk = inet_csk(sk);
 		struct tcp_sock *newtp;
-		struct sk_filter *filter;
-
-		memcpy(newsk, sk, sizeof(struct tcp_sock));
-		newsk->sk_state = TCP_SYN_RECV;
-
-		/* SANITY */
-		sk_node_init(&newsk->sk_node);
-		tcp_sk(newsk)->bind_hash = NULL;
-
-		/* Clone the TCP header template */
-		inet_sk(newsk)->dport = ireq->rmt_port;
-
-		sock_lock_init(newsk);
-		bh_lock_sock(newsk);
-
-		rwlock_init(&newsk->sk_dst_lock);
-		atomic_set(&newsk->sk_rmem_alloc, 0);
-		skb_queue_head_init(&newsk->sk_receive_queue);
-		atomic_set(&newsk->sk_wmem_alloc, 0);
-		skb_queue_head_init(&newsk->sk_write_queue);
-		atomic_set(&newsk->sk_omem_alloc, 0);
-		newsk->sk_wmem_queued = 0;
-		newsk->sk_forward_alloc = 0;
-
-		sock_reset_flag(newsk, SOCK_DONE);
-		newsk->sk_userlocks = sk->sk_userlocks & ~SOCK_BINDPORT_LOCK;
-		newsk->sk_backlog.head = newsk->sk_backlog.tail = NULL;
-		newsk->sk_send_head = NULL;
-		rwlock_init(&newsk->sk_callback_lock);
-		skb_queue_head_init(&newsk->sk_error_queue);
-		newsk->sk_write_space = sk_stream_write_space;
-
-		if ((filter = newsk->sk_filter) != NULL)
-			sk_filter_charge(newsk, filter);
-
-		if (unlikely(xfrm_sk_clone_policy(newsk))) {
-			/* It is still raw copy of parent, so invalidate
-			 * destructor and make plain sk_free() */
-			newsk->sk_destruct = NULL;
-			sk_free(newsk);
-			return NULL;
-		}
 
 		/* Now setup tcp_sock */
 		newtp = tcp_sk(newsk);
 		newtp->pred_flags = 0;
 		newtp->rcv_nxt = treq->rcv_isn + 1;
-		newtp->snd_nxt = treq->snt_isn + 1;
-		newtp->snd_una = treq->snt_isn + 1;
-		newtp->snd_sml = treq->snt_isn + 1;
+		newtp->snd_nxt = newtp->snd_una = newtp->snd_sml = treq->snt_isn + 1;
 
 		tcp_prequeue_init(newtp);
 
 		tcp_init_wl(newtp, treq->snt_isn, treq->rcv_isn);
 
-		newtp->retransmits = 0;
-		newtp->backoff = 0;
 		newtp->srtt = 0;
 		newtp->mdev = TCP_TIMEOUT_INIT;
-		newtp->rto = TCP_TIMEOUT_INIT;
+		newicsk->icsk_rto = TCP_TIMEOUT_INIT;
 
 		newtp->packets_out = 0;
 		newtp->left_out = 0;
@@ -774,9 +384,9 @@ struct sock *tcp_create_openreq_child(struct sock *sk, struct request_sock *req,
 		newtp->frto_counter = 0;
 		newtp->frto_highmark = 0;
 
-		newtp->ca_ops = &tcp_reno;
+		newicsk->icsk_ca_ops = &tcp_init_congestion_ops;
 
-		tcp_set_ca_state(newtp, TCP_CA_Open);
+		tcp_set_ca_state(newsk, TCP_CA_Open);
 		tcp_init_xmit_timers(newsk);
 		skb_queue_head_init(&newtp->out_of_order_queue);
 		newtp->rcv_wup = treq->rcv_isn + 1;
@@ -789,26 +399,12 @@ struct sock *tcp_create_openreq_child(struct sock *sk, struct request_sock *req,
 		newtp->rx_opt.dsack = 0;
 		newtp->rx_opt.eff_sacks = 0;
 
-		newtp->probes_out = 0;
 		newtp->rx_opt.num_sacks = 0;
 		newtp->urg_data = 0;
-		/* Deinitialize accept_queue to trap illegal accesses. */
-		memset(&newtp->accept_queue, 0, sizeof(newtp->accept_queue));
-
-		/* Back to base struct sock members. */
-		newsk->sk_err = 0;
-		newsk->sk_priority = 0;
-		atomic_set(&newsk->sk_refcnt, 2);
-#ifdef INET_REFCNT_DEBUG
-		atomic_inc(&inet_sock_nr);
-#endif
-		atomic_inc(&tcp_sockets_allocated);
 
 		if (sock_flag(newsk, SOCK_KEEPOPEN))
-			tcp_reset_keepalive_timer(newsk,
-						  keepalive_time_when(newtp));
-		newsk->sk_socket = NULL;
-		newsk->sk_sleep = NULL;
+			inet_csk_reset_keepalive_timer(newsk,
+						       keepalive_time_when(newtp));
 
 		newtp->rx_opt.tstamp_ok = ireq->tstamp_ok;
 		if((newtp->rx_opt.sack_ok = ireq->sack_ok) != 0) {
@@ -838,7 +434,7 @@ struct sock *tcp_create_openreq_child(struct sock *sk, struct request_sock *req,
 			newtp->tcp_header_len = sizeof(struct tcphdr);
 		}
 		if (skb->len >= TCP_MIN_RCVMSS+newtp->tcp_header_len)
-			newtp->ack.last_seg_size = skb->len-newtp->tcp_header_len;
+			newicsk->icsk_ack.last_seg_size = skb->len - newtp->tcp_header_len;
 		newtp->rx_opt.mss_clamp = req->mss;
 		TCP_ECN_openreq_child(newtp, req);
 		if (newtp->ecn_flags&TCP_ECN_OK)
@@ -934,9 +530,10 @@ struct sock *tcp_check_req(struct sock *sk,struct sk_buff *skb,
 	   does sequence test, SYN is truncated, and thus we consider
 	   it a bare ACK.
 
-	   If tp->defer_accept, we silently drop this bare ACK.  Otherwise,
-	   we create an established connection.  Both ends (listening sockets)
-	   accept the new incoming connection and try to talk to each other. 8-)
+	   If icsk->icsk_accept_queue.rskq_defer_accept, we silently drop this
+	   bare ACK.  Otherwise, we create an established connection.  Both
+	   ends (listening sockets) accept the new incoming connection and try
+	   to talk to each other. 8-)
 
 	   Note: This case is both harmless, and rare.  Possibility is about the
 	   same as us discovering intelligent life on another plant tomorrow.
@@ -1003,7 +600,8 @@ struct sock *tcp_check_req(struct sock *sk,struct sk_buff *skb,
 			return NULL;
 
 		/* If TCP_DEFER_ACCEPT is set, drop bare ACK. */
-		if (tp->defer_accept && TCP_SKB_CB(skb)->end_seq == tcp_rsk(req)->rcv_isn + 1) {
+		if (inet_csk(sk)->icsk_accept_queue.rskq_defer_accept &&
+		    TCP_SKB_CB(skb)->end_seq == tcp_rsk(req)->rcv_isn + 1) {
 			inet_rsk(req)->acked = 1;
 			return NULL;
 		}
@@ -1018,10 +616,10 @@ struct sock *tcp_check_req(struct sock *sk,struct sk_buff *skb,
 		if (child == NULL)
 			goto listen_overflow;
 
-		tcp_synq_unlink(tp, req, prev);
-		tcp_synq_removed(sk, req);
+		inet_csk_reqsk_queue_unlink(sk, req, prev);
+		inet_csk_reqsk_queue_removed(sk, req);
 
-		tcp_acceptq_queue(sk, req, child);
+		inet_csk_reqsk_queue_add(sk, req, child);
 		return child;
 
 	listen_overflow:
@@ -1035,7 +633,7 @@ struct sock *tcp_check_req(struct sock *sk,struct sk_buff *skb,
 		if (!(flg & TCP_FLAG_RST))
 			req->rsk_ops->send_reset(skb);
 
-		tcp_synq_drop(sk, req, prev);
+		inet_csk_reqsk_queue_drop(sk, req, prev);
 		return NULL;
 }
 
@@ -1074,4 +672,3 @@ EXPORT_SYMBOL(tcp_check_req);
 EXPORT_SYMBOL(tcp_child_process);
 EXPORT_SYMBOL(tcp_create_openreq_child);
 EXPORT_SYMBOL(tcp_timewait_state_process);
-EXPORT_SYMBOL(tcp_tw_deschedule);