IPVS: Move IPVS to net/netfilter/ipvs

Since IPVS now has partial IPv6 support, this patch moves IPVS from
net/ipv4/ipvs to net/netfilter/ipvs. It's a result of:

$ git mv net/ipv4/ipvs net/netfilter

and adapting the relevant Kconfigs/Makefiles to the new path.

Signed-off-by: Julius Volz <juliusv@google.com>
Signed-off-by: Simon Horman <horms@verge.net.au>

1 files changed, 0 insertions, 1110 deletions

diff --git a/net/ipv4/ipvs/ip_vs_conn.c b/net/ipv4/ipvs/ip_vs_conn.c
deleted file mode 100644
index 9a24332fbed8..000000000000
--- a/net/ipv4/ipvs/ip_vs_conn.c
+++ /dev/null
@@ -1,1110 +0,0 @@
-/*
- * IPVS         An implementation of the IP virtual server support for the
- *              LINUX operating system.  IPVS is now implemented as a module
- *              over the Netfilter framework. IPVS can be used to build a
- *              high-performance and highly available server based on a
- *              cluster of servers.
- *
- * Authors:     Wensong Zhang <wensong@linuxvirtualserver.org>
- *              Peter Kese <peter.kese@ijs.si>
- *              Julian Anastasov <ja@ssi.bg>
- *
- *              This program is free software; you can redistribute it and/or
- *              modify it under the terms of the GNU General Public License
- *              as published by the Free Software Foundation; either version
- *              2 of the License, or (at your option) any later version.
- *
- * The IPVS code for kernel 2.2 was done by Wensong Zhang and Peter Kese,
- * with changes/fixes from Julian Anastasov, Lars Marowsky-Bree, Horms
- * and others. Many code here is taken from IP MASQ code of kernel 2.2.
- *
- * Changes:
- *
- */
-
-#include <linux/interrupt.h>
-#include <linux/in.h>
-#include <linux/net.h>
-#include <linux/kernel.h>
-#include <linux/module.h>
-#include <linux/vmalloc.h>
-#include <linux/proc_fs.h>		/* for proc_net_* */
-#include <linux/seq_file.h>
-#include <linux/jhash.h>
-#include <linux/random.h>
-
-#include <net/net_namespace.h>
-#include <net/ip_vs.h>
-
-
-/*
- *  Connection hash table: for input and output packets lookups of IPVS
- */
-static struct list_head *ip_vs_conn_tab;
-
-/*  SLAB cache for IPVS connections */
-static struct kmem_cache *ip_vs_conn_cachep __read_mostly;
-
-/*  counter for current IPVS connections */
-static atomic_t ip_vs_conn_count = ATOMIC_INIT(0);
-
-/*  counter for no client port connections */
-static atomic_t ip_vs_conn_no_cport_cnt = ATOMIC_INIT(0);
-
-/* random value for IPVS connection hash */
-static unsigned int ip_vs_conn_rnd;
-
-/*
- *  Fine locking granularity for big connection hash table
- */
-#define CT_LOCKARRAY_BITS  4
-#define CT_LOCKARRAY_SIZE  (1<<CT_LOCKARRAY_BITS)
-#define CT_LOCKARRAY_MASK  (CT_LOCKARRAY_SIZE-1)
-
-struct ip_vs_aligned_lock
-{
-	rwlock_t	l;
-} __attribute__((__aligned__(SMP_CACHE_BYTES)));
-
-/* lock array for conn table */
-static struct ip_vs_aligned_lock
-__ip_vs_conntbl_lock_array[CT_LOCKARRAY_SIZE] __cacheline_aligned;
-
-static inline void ct_read_lock(unsigned key)
-{
-	read_lock(&__ip_vs_conntbl_lock_array[key&CT_LOCKARRAY_MASK].l);
-}
-
-static inline void ct_read_unlock(unsigned key)
-{
-	read_unlock(&__ip_vs_conntbl_lock_array[key&CT_LOCKARRAY_MASK].l);
-}
-
-static inline void ct_write_lock(unsigned key)
-{
-	write_lock(&__ip_vs_conntbl_lock_array[key&CT_LOCKARRAY_MASK].l);
-}
-
-static inline void ct_write_unlock(unsigned key)
-{
-	write_unlock(&__ip_vs_conntbl_lock_array[key&CT_LOCKARRAY_MASK].l);
-}
-
-static inline void ct_read_lock_bh(unsigned key)
-{
-	read_lock_bh(&__ip_vs_conntbl_lock_array[key&CT_LOCKARRAY_MASK].l);
-}
-
-static inline void ct_read_unlock_bh(unsigned key)
-{
-	read_unlock_bh(&__ip_vs_conntbl_lock_array[key&CT_LOCKARRAY_MASK].l);
-}
-
-static inline void ct_write_lock_bh(unsigned key)
-{
-	write_lock_bh(&__ip_vs_conntbl_lock_array[key&CT_LOCKARRAY_MASK].l);
-}
-
-static inline void ct_write_unlock_bh(unsigned key)
-{
-	write_unlock_bh(&__ip_vs_conntbl_lock_array[key&CT_LOCKARRAY_MASK].l);
-}
-
-
-/*
- *	Returns hash value for IPVS connection entry
- */
-static unsigned int ip_vs_conn_hashkey(int af, unsigned proto,
-				       const union nf_inet_addr *addr,
-				       __be16 port)
-{
-#ifdef CONFIG_IP_VS_IPV6
-	if (af == AF_INET6)
-		return jhash_3words(jhash(addr, 16, ip_vs_conn_rnd),
-				    (__force u32)port, proto, ip_vs_conn_rnd)
-			& IP_VS_CONN_TAB_MASK;
-#endif
-	return jhash_3words((__force u32)addr->ip, (__force u32)port, proto,
-			    ip_vs_conn_rnd)
-		& IP_VS_CONN_TAB_MASK;
-}
-
-
-/*
- *	Hashes ip_vs_conn in ip_vs_conn_tab by proto,addr,port.
- *	returns bool success.
- */
-static inline int ip_vs_conn_hash(struct ip_vs_conn *cp)
-{
-	unsigned hash;
-	int ret;
-
-	/* Hash by protocol, client address and port */
-	hash = ip_vs_conn_hashkey(cp->af, cp->protocol, &cp->caddr, cp->cport);
-
-	ct_write_lock(hash);
-
-	if (!(cp->flags & IP_VS_CONN_F_HASHED)) {
-		list_add(&cp->c_list, &ip_vs_conn_tab[hash]);
-		cp->flags |= IP_VS_CONN_F_HASHED;
-		atomic_inc(&cp->refcnt);
-		ret = 1;
-	} else {
-		IP_VS_ERR("ip_vs_conn_hash(): request for already hashed, "
-			  "called from %p\n", __builtin_return_address(0));
-		ret = 0;
-	}
-
-	ct_write_unlock(hash);
-
-	return ret;
-}
-
-
-/*
- *	UNhashes ip_vs_conn from ip_vs_conn_tab.
- *	returns bool success.
- */
-static inline int ip_vs_conn_unhash(struct ip_vs_conn *cp)
-{
-	unsigned hash;
-	int ret;
-
-	/* unhash it and decrease its reference counter */
-	hash = ip_vs_conn_hashkey(cp->af, cp->protocol, &cp->caddr, cp->cport);
-
-	ct_write_lock(hash);
-
-	if (cp->flags & IP_VS_CONN_F_HASHED) {
-		list_del(&cp->c_list);
-		cp->flags &= ~IP_VS_CONN_F_HASHED;
-		atomic_dec(&cp->refcnt);
-		ret = 1;
-	} else
-		ret = 0;
-
-	ct_write_unlock(hash);
-
-	return ret;
-}
-
-
-/*
- *  Gets ip_vs_conn associated with supplied parameters in the ip_vs_conn_tab.
- *  Called for pkts coming from OUTside-to-INside.
- *	s_addr, s_port: pkt source address (foreign host)
- *	d_addr, d_port: pkt dest address (load balancer)
- */
-static inline struct ip_vs_conn *__ip_vs_conn_in_get
-(int af, int protocol, const union nf_inet_addr *s_addr, __be16 s_port,
- const union nf_inet_addr *d_addr, __be16 d_port)
-{
-	unsigned hash;
-	struct ip_vs_conn *cp;
-
-	hash = ip_vs_conn_hashkey(af, protocol, s_addr, s_port);
-
-	ct_read_lock(hash);
-
-	list_for_each_entry(cp, &ip_vs_conn_tab[hash], c_list) {
-		if (cp->af == af &&
-		    ip_vs_addr_equal(af, s_addr, &cp->caddr) &&
-		    ip_vs_addr_equal(af, d_addr, &cp->vaddr) &&
-		    s_port == cp->cport && d_port == cp->vport &&
-		    ((!s_port) ^ (!(cp->flags & IP_VS_CONN_F_NO_CPORT))) &&
-		    protocol == cp->protocol) {
-			/* HIT */
-			atomic_inc(&cp->refcnt);
-			ct_read_unlock(hash);
-			return cp;
-		}
-	}
-
-	ct_read_unlock(hash);
-
-	return NULL;
-}
-
-struct ip_vs_conn *ip_vs_conn_in_get
-(int af, int protocol, const union nf_inet_addr *s_addr, __be16 s_port,
- const union nf_inet_addr *d_addr, __be16 d_port)
-{
-	struct ip_vs_conn *cp;
-
-	cp = __ip_vs_conn_in_get(af, protocol, s_addr, s_port, d_addr, d_port);
-	if (!cp && atomic_read(&ip_vs_conn_no_cport_cnt))
-		cp = __ip_vs_conn_in_get(af, protocol, s_addr, 0, d_addr,
-					 d_port);
-
-	IP_VS_DBG_BUF(9, "lookup/in %s %s:%d->%s:%d %s\n",
-		      ip_vs_proto_name(protocol),
-		      IP_VS_DBG_ADDR(af, s_addr), ntohs(s_port),
-		      IP_VS_DBG_ADDR(af, d_addr), ntohs(d_port),
-		      cp ? "hit" : "not hit");
-
-	return cp;
-}
-
-/* Get reference to connection template */
-struct ip_vs_conn *ip_vs_ct_in_get
-(int af, int protocol, const union nf_inet_addr *s_addr, __be16 s_port,
- const union nf_inet_addr *d_addr, __be16 d_port)
-{
-	unsigned hash;
-	struct ip_vs_conn *cp;
-
-	hash = ip_vs_conn_hashkey(af, protocol, s_addr, s_port);
-
-	ct_read_lock(hash);
-
-	list_for_each_entry(cp, &ip_vs_conn_tab[hash], c_list) {
-		if (cp->af == af &&
-		    ip_vs_addr_equal(af, s_addr, &cp->caddr) &&
-		    ip_vs_addr_equal(af, d_addr, &cp->vaddr) &&
-		    s_port == cp->cport && d_port == cp->vport &&
-		    cp->flags & IP_VS_CONN_F_TEMPLATE &&
-		    protocol == cp->protocol) {
-			/* HIT */
-			atomic_inc(&cp->refcnt);
-			goto out;
-		}
-	}
-	cp = NULL;
-
-  out:
-	ct_read_unlock(hash);
-
-	IP_VS_DBG_BUF(9, "template lookup/in %s %s:%d->%s:%d %s\n",
-		      ip_vs_proto_name(protocol),
-		      IP_VS_DBG_ADDR(af, s_addr), ntohs(s_port),
-		      IP_VS_DBG_ADDR(af, d_addr), ntohs(d_port),
-		      cp ? "hit" : "not hit");
-
-	return cp;
-}
-
-/*
- *  Gets ip_vs_conn associated with supplied parameters in the ip_vs_conn_tab.
- *  Called for pkts coming from inside-to-OUTside.
- *	s_addr, s_port: pkt source address (inside host)
- *	d_addr, d_port: pkt dest address (foreign host)
- */
-struct ip_vs_conn *ip_vs_conn_out_get
-(int af, int protocol, const union nf_inet_addr *s_addr, __be16 s_port,
- const union nf_inet_addr *d_addr, __be16 d_port)
-{
-	unsigned hash;
-	struct ip_vs_conn *cp, *ret=NULL;
-
-	/*
-	 *	Check for "full" addressed entries
-	 */
-	hash = ip_vs_conn_hashkey(af, protocol, d_addr, d_port);
-
-	ct_read_lock(hash);
-
-	list_for_each_entry(cp, &ip_vs_conn_tab[hash], c_list) {
-		if (cp->af == af &&
-		    ip_vs_addr_equal(af, d_addr, &cp->caddr) &&
-		    ip_vs_addr_equal(af, s_addr, &cp->daddr) &&
-		    d_port == cp->cport && s_port == cp->dport &&
-		    protocol == cp->protocol) {
-			/* HIT */
-			atomic_inc(&cp->refcnt);
-			ret = cp;
-			break;
-		}
-	}
-
-	ct_read_unlock(hash);
-
-	IP_VS_DBG_BUF(9, "lookup/out %s %s:%d->%s:%d %s\n",
-		      ip_vs_proto_name(protocol),
-		      IP_VS_DBG_ADDR(af, s_addr), ntohs(s_port),
-		      IP_VS_DBG_ADDR(af, d_addr), ntohs(d_port),
-		      ret ? "hit" : "not hit");
-
-	return ret;
-}
-
-
-/*
- *      Put back the conn and restart its timer with its timeout
- */
-void ip_vs_conn_put(struct ip_vs_conn *cp)
-{
-	/* reset it expire in its timeout */
-	mod_timer(&cp->timer, jiffies+cp->timeout);
-
-	__ip_vs_conn_put(cp);
-}
-
-
-/*
- *	Fill a no_client_port connection with a client port number
- */
-void ip_vs_conn_fill_cport(struct ip_vs_conn *cp, __be16 cport)
-{
-	if (ip_vs_conn_unhash(cp)) {
-		spin_lock(&cp->lock);
-		if (cp->flags & IP_VS_CONN_F_NO_CPORT) {
-			atomic_dec(&ip_vs_conn_no_cport_cnt);
-			cp->flags &= ~IP_VS_CONN_F_NO_CPORT;
-			cp->cport = cport;
-		}
-		spin_unlock(&cp->lock);
-
-		/* hash on new dport */
-		ip_vs_conn_hash(cp);
-	}
-}
-
-
-/*
- *	Bind a connection entry with the corresponding packet_xmit.
- *	Called by ip_vs_conn_new.
- */
-static inline void ip_vs_bind_xmit(struct ip_vs_conn *cp)
-{
-	switch (IP_VS_FWD_METHOD(cp)) {
-	case IP_VS_CONN_F_MASQ:
-		cp->packet_xmit = ip_vs_nat_xmit;
-		break;
-
-	case IP_VS_CONN_F_TUNNEL:
-		cp->packet_xmit = ip_vs_tunnel_xmit;
-		break;
-
-	case IP_VS_CONN_F_DROUTE:
-		cp->packet_xmit = ip_vs_dr_xmit;
-		break;
-
-	case IP_VS_CONN_F_LOCALNODE:
-		cp->packet_xmit = ip_vs_null_xmit;
-		break;
-
-	case IP_VS_CONN_F_BYPASS:
-		cp->packet_xmit = ip_vs_bypass_xmit;
-		break;
-	}
-}
-
-#ifdef CONFIG_IP_VS_IPV6
-static inline void ip_vs_bind_xmit_v6(struct ip_vs_conn *cp)
-{
-	switch (IP_VS_FWD_METHOD(cp)) {
-	case IP_VS_CONN_F_MASQ:
-		cp->packet_xmit = ip_vs_nat_xmit_v6;
-		break;
-
-	case IP_VS_CONN_F_TUNNEL:
-		cp->packet_xmit = ip_vs_tunnel_xmit_v6;
-		break;
-
-	case IP_VS_CONN_F_DROUTE:
-		cp->packet_xmit = ip_vs_dr_xmit_v6;
-		break;
-
-	case IP_VS_CONN_F_LOCALNODE:
-		cp->packet_xmit = ip_vs_null_xmit;
-		break;
-
-	case IP_VS_CONN_F_BYPASS:
-		cp->packet_xmit = ip_vs_bypass_xmit_v6;
-		break;
-	}
-}
-#endif
-
-
-static inline int ip_vs_dest_totalconns(struct ip_vs_dest *dest)
-{
-	return atomic_read(&dest->activeconns)
-		+ atomic_read(&dest->inactconns);
-}
-
-/*
- *	Bind a connection entry with a virtual service destination
- *	Called just after a new connection entry is created.
- */
-static inline void
-ip_vs_bind_dest(struct ip_vs_conn *cp, struct ip_vs_dest *dest)
-{
-	/* if dest is NULL, then return directly */
-	if (!dest)
-		return;
-
-	/* Increase the refcnt counter of the dest */
-	atomic_inc(&dest->refcnt);
-
-	/* Bind with the destination and its corresponding transmitter */
-	if ((cp->flags & IP_VS_CONN_F_SYNC) &&
-	    (!(cp->flags & IP_VS_CONN_F_TEMPLATE)))
-		/* if the connection is not template and is created
-		 * by sync, preserve the activity flag.
-		 */
-		cp->flags |= atomic_read(&dest->conn_flags) &
-			     (~IP_VS_CONN_F_INACTIVE);
-	else
-		cp->flags |= atomic_read(&dest->conn_flags);
-	cp->dest = dest;
-
-	IP_VS_DBG_BUF(7, "Bind-dest %s c:%s:%d v:%s:%d "
-		      "d:%s:%d fwd:%c s:%u conn->flags:%X conn->refcnt:%d "
-		      "dest->refcnt:%d\n",
-		      ip_vs_proto_name(cp->protocol),
-		      IP_VS_DBG_ADDR(cp->af, &cp->caddr), ntohs(cp->cport),
-		      IP_VS_DBG_ADDR(cp->af, &cp->vaddr), ntohs(cp->vport),
-		      IP_VS_DBG_ADDR(cp->af, &cp->daddr), ntohs(cp->dport),
-		      ip_vs_fwd_tag(cp), cp->state,
-		      cp->flags, atomic_read(&cp->refcnt),
-		      atomic_read(&dest->refcnt));
-
-	/* Update the connection counters */
-	if (!(cp->flags & IP_VS_CONN_F_TEMPLATE)) {
-		/* It is a normal connection, so increase the inactive
-		   connection counter because it is in TCP SYNRECV
-		   state (inactive) or other protocol inacive state */
-		if ((cp->flags & IP_VS_CONN_F_SYNC) &&
-		    (!(cp->flags & IP_VS_CONN_F_INACTIVE)))
-			atomic_inc(&dest->activeconns);
-		else
-			atomic_inc(&dest->inactconns);
-	} else {
-		/* It is a persistent connection/template, so increase
-		   the peristent connection counter */
-		atomic_inc(&dest->persistconns);
-	}
-
-	if (dest->u_threshold != 0 &&
-	    ip_vs_dest_totalconns(dest) >= dest->u_threshold)
-		dest->flags |= IP_VS_DEST_F_OVERLOAD;
-}
-
-
-/*
- * Check if there is a destination for the connection, if so
- * bind the connection to the destination.
- */
-struct ip_vs_dest *ip_vs_try_bind_dest(struct ip_vs_conn *cp)
-{
-	struct ip_vs_dest *dest;
-
-	if ((cp) && (!cp->dest)) {
-		dest = ip_vs_find_dest(cp->af, &cp->daddr, cp->dport,
-				       &cp->vaddr, cp->vport,
-				       cp->protocol);
-		ip_vs_bind_dest(cp, dest);
-		return dest;
-	} else
-		return NULL;
-}
-
-
-/*
- *	Unbind a connection entry with its VS destination
- *	Called by the ip_vs_conn_expire function.
- */
-static inline void ip_vs_unbind_dest(struct ip_vs_conn *cp)
-{
-	struct ip_vs_dest *dest = cp->dest;
-
-	if (!dest)
-		return;
-
-	IP_VS_DBG_BUF(7, "Unbind-dest %s c:%s:%d v:%s:%d "
-		      "d:%s:%d fwd:%c s:%u conn->flags:%X conn->refcnt:%d "
-		      "dest->refcnt:%d\n",
-		      ip_vs_proto_name(cp->protocol),
-		      IP_VS_DBG_ADDR(cp->af, &cp->caddr), ntohs(cp->cport),
-		      IP_VS_DBG_ADDR(cp->af, &cp->vaddr), ntohs(cp->vport),
-		      IP_VS_DBG_ADDR(cp->af, &cp->daddr), ntohs(cp->dport),
-		      ip_vs_fwd_tag(cp), cp->state,
-		      cp->flags, atomic_read(&cp->refcnt),
-		      atomic_read(&dest->refcnt));
-
-	/* Update the connection counters */
-	if (!(cp->flags & IP_VS_CONN_F_TEMPLATE)) {
-		/* It is a normal connection, so decrease the inactconns
-		   or activeconns counter */
-		if (cp->flags & IP_VS_CONN_F_INACTIVE) {
-			atomic_dec(&dest->inactconns);
-		} else {
-			atomic_dec(&dest->activeconns);
-		}
-	} else {
-		/* It is a persistent connection/template, so decrease
-		   the peristent connection counter */
-		atomic_dec(&dest->persistconns);
-	}
-
-	if (dest->l_threshold != 0) {
-		if (ip_vs_dest_totalconns(dest) < dest->l_threshold)
-			dest->flags &= ~IP_VS_DEST_F_OVERLOAD;
-	} else if (dest->u_threshold != 0) {
-		if (ip_vs_dest_totalconns(dest) * 4 < dest->u_threshold * 3)
-			dest->flags &= ~IP_VS_DEST_F_OVERLOAD;
-	} else {
-		if (dest->flags & IP_VS_DEST_F_OVERLOAD)
-			dest->flags &= ~IP_VS_DEST_F_OVERLOAD;
-	}
-
-	/*
-	 * Simply decrease the refcnt of the dest, because the
-	 * dest will be either in service's destination list
-	 * or in the trash.
-	 */
-	atomic_dec(&dest->refcnt);
-}
-
-
-/*
- *	Checking if the destination of a connection template is available.
- *	If available, return 1, otherwise invalidate this connection
- *	template and return 0.
- */
-int ip_vs_check_template(struct ip_vs_conn *ct)
-{
-	struct ip_vs_dest *dest = ct->dest;
-
-	/*
-	 * Checking the dest server status.
-	 */
-	if ((dest == NULL) ||
-	    !(dest->flags & IP_VS_DEST_F_AVAILABLE) ||
-	    (sysctl_ip_vs_expire_quiescent_template &&
-	     (atomic_read(&dest->weight) == 0))) {
-		IP_VS_DBG_BUF(9, "check_template: dest not available for "
-			      "protocol %s s:%s:%d v:%s:%d "
-			      "-> d:%s:%d\n",
-			      ip_vs_proto_name(ct->protocol),
-			      IP_VS_DBG_ADDR(ct->af, &ct->caddr),
-			      ntohs(ct->cport),
-			      IP_VS_DBG_ADDR(ct->af, &ct->vaddr),
-			      ntohs(ct->vport),
-			      IP_VS_DBG_ADDR(ct->af, &ct->daddr),
-			      ntohs(ct->dport));
-
-		/*
-		 * Invalidate the connection template
-		 */
-		if (ct->vport != htons(0xffff)) {
-			if (ip_vs_conn_unhash(ct)) {
-				ct->dport = htons(0xffff);
-				ct->vport = htons(0xffff);
-				ct->cport = 0;
-				ip_vs_conn_hash(ct);
-			}
-		}
-
-		/*
-		 * Simply decrease the refcnt of the template,
-		 * don't restart its timer.
-		 */
-		atomic_dec(&ct->refcnt);
-		return 0;
-	}
-	return 1;
-}
-
-static void ip_vs_conn_expire(unsigned long data)
-{
-	struct ip_vs_conn *cp = (struct ip_vs_conn *)data;
-
-	cp->timeout = 60*HZ;
-
-	/*
-	 *	hey, I'm using it
-	 */
-	atomic_inc(&cp->refcnt);
-
-	/*
-	 *	do I control anybody?
-	 */
-	if (atomic_read(&cp->n_control))
-		goto expire_later;
-
-	/*
-	 *	unhash it if it is hashed in the conn table
-	 */
-	if (!ip_vs_conn_unhash(cp))
-		goto expire_later;
-
-	/*
-	 *	refcnt==1 implies I'm the only one referrer
-	 */
-	if (likely(atomic_read(&cp->refcnt) == 1)) {
-		/* delete the timer if it is activated by other users */
-		if (timer_pending(&cp->timer))
-			del_timer(&cp->timer);
-
-		/* does anybody control me? */
-		if (cp->control)
-			ip_vs_control_del(cp);
-
-		if (unlikely(cp->app != NULL))
-			ip_vs_unbind_app(cp);
-		ip_vs_unbind_dest(cp);
-		if (cp->flags & IP_VS_CONN_F_NO_CPORT)
-			atomic_dec(&ip_vs_conn_no_cport_cnt);
-		atomic_dec(&ip_vs_conn_count);
-
-		kmem_cache_free(ip_vs_conn_cachep, cp);
-		return;
-	}
-
-	/* hash it back to the table */
-	ip_vs_conn_hash(cp);
-
-  expire_later:
-	IP_VS_DBG(7, "delayed: conn->refcnt-1=%d conn->n_control=%d\n",
-		  atomic_read(&cp->refcnt)-1,
-		  atomic_read(&cp->n_control));
-
-	ip_vs_conn_put(cp);
-}
-
-
-void ip_vs_conn_expire_now(struct ip_vs_conn *cp)
-{
-	if (del_timer(&cp->timer))
-		mod_timer(&cp->timer, jiffies);
-}
-
-
-/*
- *	Create a new connection entry and hash it into the ip_vs_conn_tab
- */
-struct ip_vs_conn *
-ip_vs_conn_new(int af, int proto, const union nf_inet_addr *caddr, __be16 cport,
-	       const union nf_inet_addr *vaddr, __be16 vport,
-	       const union nf_inet_addr *daddr, __be16 dport, unsigned flags,
-	       struct ip_vs_dest *dest)
-{
-	struct ip_vs_conn *cp;
-	struct ip_vs_protocol *pp = ip_vs_proto_get(proto);
-
-	cp = kmem_cache_zalloc(ip_vs_conn_cachep, GFP_ATOMIC);
-	if (cp == NULL) {
-		IP_VS_ERR_RL("ip_vs_conn_new: no memory available.\n");
-		return NULL;
-	}
-
-	INIT_LIST_HEAD(&cp->c_list);
-	setup_timer(&cp->timer, ip_vs_conn_expire, (unsigned long)cp);
-	cp->af		   = af;
-	cp->protocol	   = proto;
-	ip_vs_addr_copy(af, &cp->caddr, caddr);
-	cp->cport	   = cport;
-	ip_vs_addr_copy(af, &cp->vaddr, vaddr);
-	cp->vport	   = vport;
-	ip_vs_addr_copy(af, &cp->daddr, daddr);
-	cp->dport          = dport;
-	cp->flags	   = flags;
-	spin_lock_init(&cp->lock);
-
-	/*
-	 * Set the entry is referenced by the current thread before hashing
-	 * it in the table, so that other thread run ip_vs_random_dropentry
-	 * but cannot drop this entry.
-	 */
-	atomic_set(&cp->refcnt, 1);
-
-	atomic_set(&cp->n_control, 0);
-	atomic_set(&cp->in_pkts, 0);
-
-	atomic_inc(&ip_vs_conn_count);
-	if (flags & IP_VS_CONN_F_NO_CPORT)
-		atomic_inc(&ip_vs_conn_no_cport_cnt);
-
-	/* Bind the connection with a destination server */
-	ip_vs_bind_dest(cp, dest);
-
-	/* Set its state and timeout */
-	cp->state = 0;
-	cp->timeout = 3*HZ;
-
-	/* Bind its packet transmitter */
-#ifdef CONFIG_IP_VS_IPV6
-	if (af == AF_INET6)
-		ip_vs_bind_xmit_v6(cp);
-	else
-#endif
-		ip_vs_bind_xmit(cp);
-
-	if (unlikely(pp && atomic_read(&pp->appcnt)))
-		ip_vs_bind_app(cp, pp);
-
-	/* Hash it in the ip_vs_conn_tab finally */
-	ip_vs_conn_hash(cp);
-
-	return cp;
-}
-
-
-/*
- *	/proc/net/ip_vs_conn entries
- */
-#ifdef CONFIG_PROC_FS
-
-static void *ip_vs_conn_array(struct seq_file *seq, loff_t pos)
-{
-	int idx;
-	struct ip_vs_conn *cp;
-
-	for(idx = 0; idx < IP_VS_CONN_TAB_SIZE; idx++) {
-		ct_read_lock_bh(idx);
-		list_for_each_entry(cp, &ip_vs_conn_tab[idx], c_list) {
-			if (pos-- == 0) {
-				seq->private = &ip_vs_conn_tab[idx];
-				return cp;
-			}
-		}
-		ct_read_unlock_bh(idx);
-	}
-
-	return NULL;
-}
-
-static void *ip_vs_conn_seq_start(struct seq_file *seq, loff_t *pos)
-{
-	seq->private = NULL;
-	return *pos ? ip_vs_conn_array(seq, *pos - 1) :SEQ_START_TOKEN;
-}
-
-static void *ip_vs_conn_seq_next(struct seq_file *seq, void *v, loff_t *pos)
-{
-	struct ip_vs_conn *cp = v;
-	struct list_head *e, *l = seq->private;
-	int idx;
-
-	++*pos;
-	if (v == SEQ_START_TOKEN)
-		return ip_vs_conn_array(seq, 0);
-
-	/* more on same hash chain? */
-	if ((e = cp->c_list.next) != l)
-		return list_entry(e, struct ip_vs_conn, c_list);
-
-	idx = l - ip_vs_conn_tab;
-	ct_read_unlock_bh(idx);
-
-	while (++idx < IP_VS_CONN_TAB_SIZE) {
-		ct_read_lock_bh(idx);
-		list_for_each_entry(cp, &ip_vs_conn_tab[idx], c_list) {
-			seq->private = &ip_vs_conn_tab[idx];
-			return cp;
-		}
-		ct_read_unlock_bh(idx);
-	}
-	seq->private = NULL;
-	return NULL;
-}
-
-static void ip_vs_conn_seq_stop(struct seq_file *seq, void *v)
-{
-	struct list_head *l = seq->private;
-
-	if (l)
-		ct_read_unlock_bh(l - ip_vs_conn_tab);
-}
-
-static int ip_vs_conn_seq_show(struct seq_file *seq, void *v)
-{
-
-	if (v == SEQ_START_TOKEN)
-		seq_puts(seq,
-   "Pro FromIP   FPrt ToIP     TPrt DestIP   DPrt State       Expires\n");
-	else {
-		const struct ip_vs_conn *cp = v;
-
-#ifdef CONFIG_IP_VS_IPV6
-		if (cp->af == AF_INET6)
-			seq_printf(seq,
-				"%-3s " NIP6_FMT " %04X " NIP6_FMT
-				" %04X " NIP6_FMT " %04X %-11s %7lu\n",
-				ip_vs_proto_name(cp->protocol),
-				NIP6(cp->caddr.in6), ntohs(cp->cport),
-				NIP6(cp->vaddr.in6), ntohs(cp->vport),
-				NIP6(cp->daddr.in6), ntohs(cp->dport),
-				ip_vs_state_name(cp->protocol, cp->state),
-				(cp->timer.expires-jiffies)/HZ);
-		else
-#endif
-			seq_printf(seq,
-				"%-3s %08X %04X %08X %04X"
-				" %08X %04X %-11s %7lu\n",
-				ip_vs_proto_name(cp->protocol),
-				ntohl(cp->caddr.ip), ntohs(cp->cport),
-				ntohl(cp->vaddr.ip), ntohs(cp->vport),
-				ntohl(cp->daddr.ip), ntohs(cp->dport),
-				ip_vs_state_name(cp->protocol, cp->state),
-				(cp->timer.expires-jiffies)/HZ);
-	}
-	return 0;
-}
-
-static const struct seq_operations ip_vs_conn_seq_ops = {
-	.start = ip_vs_conn_seq_start,
-	.next  = ip_vs_conn_seq_next,
-	.stop  = ip_vs_conn_seq_stop,
-	.show  = ip_vs_conn_seq_show,
-};
-
-static int ip_vs_conn_open(struct inode *inode, struct file *file)
-{
-	return seq_open(file, &ip_vs_conn_seq_ops);
-}
-
-static const struct file_operations ip_vs_conn_fops = {
-	.owner	 = THIS_MODULE,
-	.open    = ip_vs_conn_open,
-	.read    = seq_read,
-	.llseek  = seq_lseek,
-	.release = seq_release,
-};
-
-static const char *ip_vs_origin_name(unsigned flags)
-{
-	if (flags & IP_VS_CONN_F_SYNC)
-		return "SYNC";
-	else
-		return "LOCAL";
-}
-
-static int ip_vs_conn_sync_seq_show(struct seq_file *seq, void *v)
-{
-
-	if (v == SEQ_START_TOKEN)
-		seq_puts(seq,
-   "Pro FromIP   FPrt ToIP     TPrt DestIP   DPrt State       Origin Expires\n");
-	else {
-		const struct ip_vs_conn *cp = v;
-
-#ifdef CONFIG_IP_VS_IPV6
-		if (cp->af == AF_INET6)
-			seq_printf(seq,
-				"%-3s " NIP6_FMT " %04X " NIP6_FMT
-				" %04X " NIP6_FMT " %04X %-11s %-6s %7lu\n",
-				ip_vs_proto_name(cp->protocol),
-				NIP6(cp->caddr.in6), ntohs(cp->cport),
-				NIP6(cp->vaddr.in6), ntohs(cp->vport),
-				NIP6(cp->daddr.in6), ntohs(cp->dport),
-				ip_vs_state_name(cp->protocol, cp->state),
-				ip_vs_origin_name(cp->flags),
-				(cp->timer.expires-jiffies)/HZ);
-		else
-#endif
-			seq_printf(seq,
-				"%-3s %08X %04X %08X %04X "
-				"%08X %04X %-11s %-6s %7lu\n",
-				ip_vs_proto_name(cp->protocol),
-				ntohl(cp->caddr.ip), ntohs(cp->cport),
-				ntohl(cp->vaddr.ip), ntohs(cp->vport),
-				ntohl(cp->daddr.ip), ntohs(cp->dport),
-				ip_vs_state_name(cp->protocol, cp->state),
-				ip_vs_origin_name(cp->flags),
-				(cp->timer.expires-jiffies)/HZ);
-	}
-	return 0;
-}
-
-static const struct seq_operations ip_vs_conn_sync_seq_ops = {
-	.start = ip_vs_conn_seq_start,
-	.next  = ip_vs_conn_seq_next,
-	.stop  = ip_vs_conn_seq_stop,
-	.show  = ip_vs_conn_sync_seq_show,
-};
-
-static int ip_vs_conn_sync_open(struct inode *inode, struct file *file)
-{
-	return seq_open(file, &ip_vs_conn_sync_seq_ops);
-}
-
-static const struct file_operations ip_vs_conn_sync_fops = {
-	.owner	 = THIS_MODULE,
-	.open    = ip_vs_conn_sync_open,
-	.read    = seq_read,
-	.llseek  = seq_lseek,
-	.release = seq_release,
-};
-
-#endif
-
-
-/*
- *      Randomly drop connection entries before running out of memory
- */
-static inline int todrop_entry(struct ip_vs_conn *cp)
-{
-	/*
-	 * The drop rate array needs tuning for real environments.
-	 * Called from timer bh only => no locking
-	 */
-	static const char todrop_rate[9] = {0, 1, 2, 3, 4, 5, 6, 7, 8};
-	static char todrop_counter[9] = {0};
-	int i;
-
-	/* if the conn entry hasn't lasted for 60 seconds, don't drop it.
-	   This will leave enough time for normal connection to get
-	   through. */
-	if (time_before(cp->timeout + jiffies, cp->timer.expires + 60*HZ))
-		return 0;
-
-	/* Don't drop the entry if its number of incoming packets is not
-	   located in [0, 8] */
-	i = atomic_read(&cp->in_pkts);
-	if (i > 8 || i < 0) return 0;
-
-	if (!todrop_rate[i]) return 0;
-	if (--todrop_counter[i] > 0) return 0;
-
-	todrop_counter[i] = todrop_rate[i];
-	return 1;
-}
-
-/* Called from keventd and must protect itself from softirqs */
-void ip_vs_random_dropentry(void)
-{
-	int idx;
-	struct ip_vs_conn *cp;
-
-	/*
-	 * Randomly scan 1/32 of the whole table every second
-	 */
-	for (idx = 0; idx < (IP_VS_CONN_TAB_SIZE>>5); idx++) {
-		unsigned hash = net_random() & IP_VS_CONN_TAB_MASK;
-
-		/*
-		 *  Lock is actually needed in this loop.
-		 */
-		ct_write_lock_bh(hash);
-
-		list_for_each_entry(cp, &ip_vs_conn_tab[hash], c_list) {
-			if (cp->flags & IP_VS_CONN_F_TEMPLATE)
-				/* connection template */
-				continue;
-
-			if (cp->protocol == IPPROTO_TCP) {
-				switch(cp->state) {
-				case IP_VS_TCP_S_SYN_RECV:
-				case IP_VS_TCP_S_SYNACK:
-					break;
-
-				case IP_VS_TCP_S_ESTABLISHED:
-					if (todrop_entry(cp))
-						break;
-					continue;
-
-				default:
-					continue;
-				}
-			} else {
-				if (!todrop_entry(cp))
-					continue;
-			}
-
-			IP_VS_DBG(4, "del connection\n");
-			ip_vs_conn_expire_now(cp);
-			if (cp->control) {
-				IP_VS_DBG(4, "del conn template\n");
-				ip_vs_conn_expire_now(cp->control);
-			}
-		}
-		ct_write_unlock_bh(hash);
-	}
-}
-
-
-/*
- *      Flush all the connection entries in the ip_vs_conn_tab
- */
-static void ip_vs_conn_flush(void)
-{
-	int idx;
-	struct ip_vs_conn *cp;
-
-  flush_again:
-	for (idx=0; idx<IP_VS_CONN_TAB_SIZE; idx++) {
-		/*
-		 *  Lock is actually needed in this loop.
-		 */
-		ct_write_lock_bh(idx);
-
-		list_for_each_entry(cp, &ip_vs_conn_tab[idx], c_list) {
-
-			IP_VS_DBG(4, "del connection\n");
-			ip_vs_conn_expire_now(cp);
-			if (cp->control) {
-				IP_VS_DBG(4, "del conn template\n");
-				ip_vs_conn_expire_now(cp->control);
-			}
-		}
-		ct_write_unlock_bh(idx);
-	}
-
-	/* the counter may be not NULL, because maybe some conn entries
-	   are run by slow timer handler or unhashed but still referred */
-	if (atomic_read(&ip_vs_conn_count) != 0) {
-		schedule();
-		goto flush_again;
-	}
-}
-
-
-int __init ip_vs_conn_init(void)
-{
-	int idx;
-
-	/*
-	 * Allocate the connection hash table and initialize its list heads
-	 */
-	ip_vs_conn_tab = vmalloc(IP_VS_CONN_TAB_SIZE*sizeof(struct list_head));
-	if (!ip_vs_conn_tab)
-		return -ENOMEM;
-
-	/* Allocate ip_vs_conn slab cache */
-	ip_vs_conn_cachep = kmem_cache_create("ip_vs_conn",
-					      sizeof(struct ip_vs_conn), 0,
-					      SLAB_HWCACHE_ALIGN, NULL);
-	if (!ip_vs_conn_cachep) {
-		vfree(ip_vs_conn_tab);
-		return -ENOMEM;
-	}
-
-	IP_VS_INFO("Connection hash table configured "
-		   "(size=%d, memory=%ldKbytes)\n",
-		   IP_VS_CONN_TAB_SIZE,
-		   (long)(IP_VS_CONN_TAB_SIZE*sizeof(struct list_head))/1024);
-	IP_VS_DBG(0, "Each connection entry needs %Zd bytes at least\n",
-		  sizeof(struct ip_vs_conn));
-
-	for (idx = 0; idx < IP_VS_CONN_TAB_SIZE; idx++) {
-		INIT_LIST_HEAD(&ip_vs_conn_tab[idx]);
-	}
-
-	for (idx = 0; idx < CT_LOCKARRAY_SIZE; idx++)  {
-		rwlock_init(&__ip_vs_conntbl_lock_array[idx].l);
-	}
-
-	proc_net_fops_create(&init_net, "ip_vs_conn", 0, &ip_vs_conn_fops);
-	proc_net_fops_create(&init_net, "ip_vs_conn_sync", 0, &ip_vs_conn_sync_fops);
-
-	/* calculate the random value for connection hash */
-	get_random_bytes(&ip_vs_conn_rnd, sizeof(ip_vs_conn_rnd));
-
-	return 0;
-}
-
-
-void ip_vs_conn_cleanup(void)
-{
-	/* flush all the connection entries first */
-	ip_vs_conn_flush();
-
-	/* Release the empty cache */
-	kmem_cache_destroy(ip_vs_conn_cachep);
-	proc_net_remove(&init_net, "ip_vs_conn");
-	proc_net_remove(&init_net, "ip_vs_conn_sync");
-	vfree(ip_vs_conn_tab);
-}