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, 1542 deletions

diff --git a/net/ipv4/ipvs/ip_vs_core.c b/net/ipv4/ipvs/ip_vs_core.c
deleted file mode 100644
index 958abf3e5f8..00000000000
--- a/net/ipv4/ipvs/ip_vs_core.c
+++ /dev/null
@@ -1,1542 +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.
- *
- * Changes:
- *	Paul `Rusty' Russell		properly handle non-linear skbs
- *	Harald Welte			don't use nfcache
- *
- */
-
-#include <linux/module.h>
-#include <linux/kernel.h>
-#include <linux/ip.h>
-#include <linux/tcp.h>
-#include <linux/icmp.h>
-
-#include <net/ip.h>
-#include <net/tcp.h>
-#include <net/udp.h>
-#include <net/icmp.h>                   /* for icmp_send */
-#include <net/route.h>
-
-#include <linux/netfilter.h>
-#include <linux/netfilter_ipv4.h>
-
-#ifdef CONFIG_IP_VS_IPV6
-#include <net/ipv6.h>
-#include <linux/netfilter_ipv6.h>
-#endif
-
-#include <net/ip_vs.h>
-
-
-EXPORT_SYMBOL(register_ip_vs_scheduler);
-EXPORT_SYMBOL(unregister_ip_vs_scheduler);
-EXPORT_SYMBOL(ip_vs_skb_replace);
-EXPORT_SYMBOL(ip_vs_proto_name);
-EXPORT_SYMBOL(ip_vs_conn_new);
-EXPORT_SYMBOL(ip_vs_conn_in_get);
-EXPORT_SYMBOL(ip_vs_conn_out_get);
-#ifdef CONFIG_IP_VS_PROTO_TCP
-EXPORT_SYMBOL(ip_vs_tcp_conn_listen);
-#endif
-EXPORT_SYMBOL(ip_vs_conn_put);
-#ifdef CONFIG_IP_VS_DEBUG
-EXPORT_SYMBOL(ip_vs_get_debug_level);
-#endif
-
-
-/* ID used in ICMP lookups */
-#define icmp_id(icmph)          (((icmph)->un).echo.id)
-#define icmpv6_id(icmph)        (icmph->icmp6_dataun.u_echo.identifier)
-
-const char *ip_vs_proto_name(unsigned proto)
-{
-	static char buf[20];
-
-	switch (proto) {
-	case IPPROTO_IP:
-		return "IP";
-	case IPPROTO_UDP:
-		return "UDP";
-	case IPPROTO_TCP:
-		return "TCP";
-	case IPPROTO_ICMP:
-		return "ICMP";
-#ifdef CONFIG_IP_VS_IPV6
-	case IPPROTO_ICMPV6:
-		return "ICMPv6";
-#endif
-	default:
-		sprintf(buf, "IP_%d", proto);
-		return buf;
-	}
-}
-
-void ip_vs_init_hash_table(struct list_head *table, int rows)
-{
-	while (--rows >= 0)
-		INIT_LIST_HEAD(&table[rows]);
-}
-
-static inline void
-ip_vs_in_stats(struct ip_vs_conn *cp, struct sk_buff *skb)
-{
-	struct ip_vs_dest *dest = cp->dest;
-	if (dest && (dest->flags & IP_VS_DEST_F_AVAILABLE)) {
-		spin_lock(&dest->stats.lock);
-		dest->stats.ustats.inpkts++;
-		dest->stats.ustats.inbytes += skb->len;
-		spin_unlock(&dest->stats.lock);
-
-		spin_lock(&dest->svc->stats.lock);
-		dest->svc->stats.ustats.inpkts++;
-		dest->svc->stats.ustats.inbytes += skb->len;
-		spin_unlock(&dest->svc->stats.lock);
-
-		spin_lock(&ip_vs_stats.lock);
-		ip_vs_stats.ustats.inpkts++;
-		ip_vs_stats.ustats.inbytes += skb->len;
-		spin_unlock(&ip_vs_stats.lock);
-	}
-}
-
-
-static inline void
-ip_vs_out_stats(struct ip_vs_conn *cp, struct sk_buff *skb)
-{
-	struct ip_vs_dest *dest = cp->dest;
-	if (dest && (dest->flags & IP_VS_DEST_F_AVAILABLE)) {
-		spin_lock(&dest->stats.lock);
-		dest->stats.ustats.outpkts++;
-		dest->stats.ustats.outbytes += skb->len;
-		spin_unlock(&dest->stats.lock);
-
-		spin_lock(&dest->svc->stats.lock);
-		dest->svc->stats.ustats.outpkts++;
-		dest->svc->stats.ustats.outbytes += skb->len;
-		spin_unlock(&dest->svc->stats.lock);
-
-		spin_lock(&ip_vs_stats.lock);
-		ip_vs_stats.ustats.outpkts++;
-		ip_vs_stats.ustats.outbytes += skb->len;
-		spin_unlock(&ip_vs_stats.lock);
-	}
-}
-
-
-static inline void
-ip_vs_conn_stats(struct ip_vs_conn *cp, struct ip_vs_service *svc)
-{
-	spin_lock(&cp->dest->stats.lock);
-	cp->dest->stats.ustats.conns++;
-	spin_unlock(&cp->dest->stats.lock);
-
-	spin_lock(&svc->stats.lock);
-	svc->stats.ustats.conns++;
-	spin_unlock(&svc->stats.lock);
-
-	spin_lock(&ip_vs_stats.lock);
-	ip_vs_stats.ustats.conns++;
-	spin_unlock(&ip_vs_stats.lock);
-}
-
-
-static inline int
-ip_vs_set_state(struct ip_vs_conn *cp, int direction,
-		const struct sk_buff *skb,
-		struct ip_vs_protocol *pp)
-{
-	if (unlikely(!pp->state_transition))
-		return 0;
-	return pp->state_transition(cp, direction, skb, pp);
-}
-
-
-/*
- *  IPVS persistent scheduling function
- *  It creates a connection entry according to its template if exists,
- *  or selects a server and creates a connection entry plus a template.
- *  Locking: we are svc user (svc->refcnt), so we hold all dests too
- *  Protocols supported: TCP, UDP
- */
-static struct ip_vs_conn *
-ip_vs_sched_persist(struct ip_vs_service *svc,
-		    const struct sk_buff *skb,
-		    __be16 ports[2])
-{
-	struct ip_vs_conn *cp = NULL;
-	struct ip_vs_iphdr iph;
-	struct ip_vs_dest *dest;
-	struct ip_vs_conn *ct;
-	__be16  dport;			/* destination port to forward */
-	union nf_inet_addr snet;	/* source network of the client,
-					   after masking */
-
-	ip_vs_fill_iphdr(svc->af, skb_network_header(skb), &iph);
-
-	/* Mask saddr with the netmask to adjust template granularity */
-#ifdef CONFIG_IP_VS_IPV6
-	if (svc->af == AF_INET6)
-		ipv6_addr_prefix(&snet.in6, &iph.saddr.in6, svc->netmask);
-	else
-#endif
-		snet.ip = iph.saddr.ip & svc->netmask;
-
-	IP_VS_DBG_BUF(6, "p-schedule: src %s:%u dest %s:%u "
-		      "mnet %s\n",
-		      IP_VS_DBG_ADDR(svc->af, &iph.saddr), ntohs(ports[0]),
-		      IP_VS_DBG_ADDR(svc->af, &iph.daddr), ntohs(ports[1]),
-		      IP_VS_DBG_ADDR(svc->af, &snet));
-
-	/*
-	 * As far as we know, FTP is a very complicated network protocol, and
-	 * it uses control connection and data connections. For active FTP,
-	 * FTP server initialize data connection to the client, its source port
-	 * is often 20. For passive FTP, FTP server tells the clients the port
-	 * that it passively listens to,  and the client issues the data
-	 * connection. In the tunneling or direct routing mode, the load
-	 * balancer is on the client-to-server half of connection, the port
-	 * number is unknown to the load balancer. So, a conn template like
-	 * <caddr, 0, vaddr, 0, daddr, 0> is created for persistent FTP
-	 * service, and a template like <caddr, 0, vaddr, vport, daddr, dport>
-	 * is created for other persistent services.
-	 */
-	if (ports[1] == svc->port) {
-		/* Check if a template already exists */
-		if (svc->port != FTPPORT)
-			ct = ip_vs_ct_in_get(svc->af, iph.protocol, &snet, 0,
-					     &iph.daddr, ports[1]);
-		else
-			ct = ip_vs_ct_in_get(svc->af, iph.protocol, &snet, 0,
-					     &iph.daddr, 0);
-
-		if (!ct || !ip_vs_check_template(ct)) {
-			/*
-			 * No template found or the dest of the connection
-			 * template is not available.
-			 */
-			dest = svc->scheduler->schedule(svc, skb);
-			if (dest == NULL) {
-				IP_VS_DBG(1, "p-schedule: no dest found.\n");
-				return NULL;
-			}
-
-			/*
-			 * Create a template like <protocol,caddr,0,
-			 * vaddr,vport,daddr,dport> for non-ftp service,
-			 * and <protocol,caddr,0,vaddr,0,daddr,0>
-			 * for ftp service.
-			 */
-			if (svc->port != FTPPORT)
-				ct = ip_vs_conn_new(svc->af, iph.protocol,
-						    &snet, 0,
-						    &iph.daddr,
-						    ports[1],
-						    &dest->addr, dest->port,
-						    IP_VS_CONN_F_TEMPLATE,
-						    dest);
-			else
-				ct = ip_vs_conn_new(svc->af, iph.protocol,
-						    &snet, 0,
-						    &iph.daddr, 0,
-						    &dest->addr, 0,
-						    IP_VS_CONN_F_TEMPLATE,
-						    dest);
-			if (ct == NULL)
-				return NULL;
-
-			ct->timeout = svc->timeout;
-		} else {
-			/* set destination with the found template */
-			dest = ct->dest;
-		}
-		dport = dest->port;
-	} else {
-		/*
-		 * Note: persistent fwmark-based services and persistent
-		 * port zero service are handled here.
-		 * fwmark template: <IPPROTO_IP,caddr,0,fwmark,0,daddr,0>
-		 * port zero template: <protocol,caddr,0,vaddr,0,daddr,0>
-		 */
-		if (svc->fwmark) {
-			union nf_inet_addr fwmark = {
-				.all = { 0, 0, 0, htonl(svc->fwmark) }
-			};
-
-			ct = ip_vs_ct_in_get(svc->af, IPPROTO_IP, &snet, 0,
-					     &fwmark, 0);
-		} else
-			ct = ip_vs_ct_in_get(svc->af, iph.protocol, &snet, 0,
-					     &iph.daddr, 0);
-
-		if (!ct || !ip_vs_check_template(ct)) {
-			/*
-			 * If it is not persistent port zero, return NULL,
-			 * otherwise create a connection template.
-			 */
-			if (svc->port)
-				return NULL;
-
-			dest = svc->scheduler->schedule(svc, skb);
-			if (dest == NULL) {
-				IP_VS_DBG(1, "p-schedule: no dest found.\n");
-				return NULL;
-			}
-
-			/*
-			 * Create a template according to the service
-			 */
-			if (svc->fwmark) {
-				union nf_inet_addr fwmark = {
-					.all = { 0, 0, 0, htonl(svc->fwmark) }
-				};
-
-				ct = ip_vs_conn_new(svc->af, IPPROTO_IP,
-						    &snet, 0,
-						    &fwmark, 0,
-						    &dest->addr, 0,
-						    IP_VS_CONN_F_TEMPLATE,
-						    dest);
-			} else
-				ct = ip_vs_conn_new(svc->af, iph.protocol,
-						    &snet, 0,
-						    &iph.daddr, 0,
-						    &dest->addr, 0,
-						    IP_VS_CONN_F_TEMPLATE,
-						    dest);
-			if (ct == NULL)
-				return NULL;
-
-			ct->timeout = svc->timeout;
-		} else {
-			/* set destination with the found template */
-			dest = ct->dest;
-		}
-		dport = ports[1];
-	}
-
-	/*
-	 *    Create a new connection according to the template
-	 */
-	cp = ip_vs_conn_new(svc->af, iph.protocol,
-			    &iph.saddr, ports[0],
-			    &iph.daddr, ports[1],
-			    &dest->addr, dport,
-			    0,
-			    dest);
-	if (cp == NULL) {
-		ip_vs_conn_put(ct);
-		return NULL;
-	}
-
-	/*
-	 *    Add its control
-	 */
-	ip_vs_control_add(cp, ct);
-	ip_vs_conn_put(ct);
-
-	ip_vs_conn_stats(cp, svc);
-	return cp;
-}
-
-
-/*
- *  IPVS main scheduling function
- *  It selects a server according to the virtual service, and
- *  creates a connection entry.
- *  Protocols supported: TCP, UDP
- */
-struct ip_vs_conn *
-ip_vs_schedule(struct ip_vs_service *svc, const struct sk_buff *skb)
-{
-	struct ip_vs_conn *cp = NULL;
-	struct ip_vs_iphdr iph;
-	struct ip_vs_dest *dest;
-	__be16 _ports[2], *pptr;
-
-	ip_vs_fill_iphdr(svc->af, skb_network_header(skb), &iph);
-	pptr = skb_header_pointer(skb, iph.len, sizeof(_ports), _ports);
-	if (pptr == NULL)
-		return NULL;
-
-	/*
-	 *    Persistent service
-	 */
-	if (svc->flags & IP_VS_SVC_F_PERSISTENT)
-		return ip_vs_sched_persist(svc, skb, pptr);
-
-	/*
-	 *    Non-persistent service
-	 */
-	if (!svc->fwmark && pptr[1] != svc->port) {
-		if (!svc->port)
-			IP_VS_ERR("Schedule: port zero only supported "
-				  "in persistent services, "
-				  "check your ipvs configuration\n");
-		return NULL;
-	}
-
-	dest = svc->scheduler->schedule(svc, skb);
-	if (dest == NULL) {
-		IP_VS_DBG(1, "Schedule: no dest found.\n");
-		return NULL;
-	}
-
-	/*
-	 *    Create a connection entry.
-	 */
-	cp = ip_vs_conn_new(svc->af, iph.protocol,
-			    &iph.saddr, pptr[0],
-			    &iph.daddr, pptr[1],
-			    &dest->addr, dest->port ? dest->port : pptr[1],
-			    0,
-			    dest);
-	if (cp == NULL)
-		return NULL;
-
-	IP_VS_DBG_BUF(6, "Schedule fwd:%c c:%s:%u v:%s:%u "
-		      "d:%s:%u conn->flags:%X conn->refcnt:%d\n",
-		      ip_vs_fwd_tag(cp),
-		      IP_VS_DBG_ADDR(svc->af, &cp->caddr), ntohs(cp->cport),
-		      IP_VS_DBG_ADDR(svc->af, &cp->vaddr), ntohs(cp->vport),
-		      IP_VS_DBG_ADDR(svc->af, &cp->daddr), ntohs(cp->dport),
-		      cp->flags, atomic_read(&cp->refcnt));
-
-	ip_vs_conn_stats(cp, svc);
-	return cp;
-}
-
-
-/*
- *  Pass or drop the packet.
- *  Called by ip_vs_in, when the virtual service is available but
- *  no destination is available for a new connection.
- */
-int ip_vs_leave(struct ip_vs_service *svc, struct sk_buff *skb,
-		struct ip_vs_protocol *pp)
-{
-	__be16 _ports[2], *pptr;
-	struct ip_vs_iphdr iph;
-	int unicast;
-	ip_vs_fill_iphdr(svc->af, skb_network_header(skb), &iph);
-
-	pptr = skb_header_pointer(skb, iph.len, sizeof(_ports), _ports);
-	if (pptr == NULL) {
-		ip_vs_service_put(svc);
-		return NF_DROP;
-	}
-
-#ifdef CONFIG_IP_VS_IPV6
-	if (svc->af == AF_INET6)
-		unicast = ipv6_addr_type(&iph.daddr.in6) & IPV6_ADDR_UNICAST;
-	else
-#endif
-		unicast = (inet_addr_type(&init_net, iph.daddr.ip) == RTN_UNICAST);
-
-	/* if it is fwmark-based service, the cache_bypass sysctl is up
-	   and the destination is a non-local unicast, then create
-	   a cache_bypass connection entry */
-	if (sysctl_ip_vs_cache_bypass && svc->fwmark && unicast) {
-		int ret, cs;
-		struct ip_vs_conn *cp;
-		union nf_inet_addr daddr =  { .all = { 0, 0, 0, 0 } };
-
-		ip_vs_service_put(svc);
-
-		/* create a new connection entry */
-		IP_VS_DBG(6, "ip_vs_leave: create a cache_bypass entry\n");
-		cp = ip_vs_conn_new(svc->af, iph.protocol,
-				    &iph.saddr, pptr[0],
-				    &iph.daddr, pptr[1],
-				    &daddr, 0,
-				    IP_VS_CONN_F_BYPASS,
-				    NULL);
-		if (cp == NULL)
-			return NF_DROP;
-
-		/* statistics */
-		ip_vs_in_stats(cp, skb);
-
-		/* set state */
-		cs = ip_vs_set_state(cp, IP_VS_DIR_INPUT, skb, pp);
-
-		/* transmit the first SYN packet */
-		ret = cp->packet_xmit(skb, cp, pp);
-		/* do not touch skb anymore */
-
-		atomic_inc(&cp->in_pkts);
-		ip_vs_conn_put(cp);
-		return ret;
-	}
-
-	/*
-	 * When the virtual ftp service is presented, packets destined
-	 * for other services on the VIP may get here (except services
-	 * listed in the ipvs table), pass the packets, because it is
-	 * not ipvs job to decide to drop the packets.
-	 */
-	if ((svc->port == FTPPORT) && (pptr[1] != FTPPORT)) {
-		ip_vs_service_put(svc);
-		return NF_ACCEPT;
-	}
-
-	ip_vs_service_put(svc);
-
-	/*
-	 * Notify the client that the destination is unreachable, and
-	 * release the socket buffer.
-	 * Since it is in IP layer, the TCP socket is not actually
-	 * created, the TCP RST packet cannot be sent, instead that
-	 * ICMP_PORT_UNREACH is sent here no matter it is TCP/UDP. --WZ
-	 */
-#ifdef CONFIG_IP_VS_IPV6
-	if (svc->af == AF_INET6)
-		icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_PORT_UNREACH, 0,
-			    skb->dev);
-	else
-#endif
-		icmp_send(skb, ICMP_DEST_UNREACH, ICMP_PORT_UNREACH, 0);
-
-	return NF_DROP;
-}
-
-
-/*
- *      It is hooked before NF_IP_PRI_NAT_SRC at the NF_INET_POST_ROUTING
- *      chain, and is used for VS/NAT.
- *      It detects packets for VS/NAT connections and sends the packets
- *      immediately. This can avoid that iptable_nat mangles the packets
- *      for VS/NAT.
- */
-static unsigned int ip_vs_post_routing(unsigned int hooknum,
-				       struct sk_buff *skb,
-				       const struct net_device *in,
-				       const struct net_device *out,
-				       int (*okfn)(struct sk_buff *))
-{
-	if (!skb->ipvs_property)
-		return NF_ACCEPT;
-	/* The packet was sent from IPVS, exit this chain */
-	return NF_STOP;
-}
-
-__sum16 ip_vs_checksum_complete(struct sk_buff *skb, int offset)
-{
-	return csum_fold(skb_checksum(skb, offset, skb->len - offset, 0));
-}
-
-static inline int ip_vs_gather_frags(struct sk_buff *skb, u_int32_t user)
-{
-	int err = ip_defrag(skb, user);
-
-	if (!err)
-		ip_send_check(ip_hdr(skb));
-
-	return err;
-}
-
-#ifdef CONFIG_IP_VS_IPV6
-static inline int ip_vs_gather_frags_v6(struct sk_buff *skb, u_int32_t user)
-{
-	/* TODO IPv6: Find out what to do here for IPv6 */
-	return 0;
-}
-#endif
-
-/*
- * Packet has been made sufficiently writable in caller
- * - inout: 1=in->out, 0=out->in
- */
-void ip_vs_nat_icmp(struct sk_buff *skb, struct ip_vs_protocol *pp,
-		    struct ip_vs_conn *cp, int inout)
-{
-	struct iphdr *iph	 = ip_hdr(skb);
-	unsigned int icmp_offset = iph->ihl*4;
-	struct icmphdr *icmph	 = (struct icmphdr *)(skb_network_header(skb) +
-						      icmp_offset);
-	struct iphdr *ciph	 = (struct iphdr *)(icmph + 1);
-
-	if (inout) {
-		iph->saddr = cp->vaddr.ip;
-		ip_send_check(iph);
-		ciph->daddr = cp->vaddr.ip;
-		ip_send_check(ciph);
-	} else {
-		iph->daddr = cp->daddr.ip;
-		ip_send_check(iph);
-		ciph->saddr = cp->daddr.ip;
-		ip_send_check(ciph);
-	}
-
-	/* the TCP/UDP port */
-	if (IPPROTO_TCP == ciph->protocol || IPPROTO_UDP == ciph->protocol) {
-		__be16 *ports = (void *)ciph + ciph->ihl*4;
-
-		if (inout)
-			ports[1] = cp->vport;
-		else
-			ports[0] = cp->dport;
-	}
-
-	/* And finally the ICMP checksum */
-	icmph->checksum = 0;
-	icmph->checksum = ip_vs_checksum_complete(skb, icmp_offset);
-	skb->ip_summed = CHECKSUM_UNNECESSARY;
-
-	if (inout)
-		IP_VS_DBG_PKT(11, pp, skb, (void *)ciph - (void *)iph,
-			"Forwarding altered outgoing ICMP");
-	else
-		IP_VS_DBG_PKT(11, pp, skb, (void *)ciph - (void *)iph,
-			"Forwarding altered incoming ICMP");
-}
-
-#ifdef CONFIG_IP_VS_IPV6
-void ip_vs_nat_icmp_v6(struct sk_buff *skb, struct ip_vs_protocol *pp,
-		    struct ip_vs_conn *cp, int inout)
-{
-	struct ipv6hdr *iph	 = ipv6_hdr(skb);
-	unsigned int icmp_offset = sizeof(struct ipv6hdr);
-	struct icmp6hdr *icmph	 = (struct icmp6hdr *)(skb_network_header(skb) +
-						      icmp_offset);
-	struct ipv6hdr *ciph	 = (struct ipv6hdr *)(icmph + 1);
-
-	if (inout) {
-		iph->saddr = cp->vaddr.in6;
-		ciph->daddr = cp->vaddr.in6;
-	} else {
-		iph->daddr = cp->daddr.in6;
-		ciph->saddr = cp->daddr.in6;
-	}
-
-	/* the TCP/UDP port */
-	if (IPPROTO_TCP == ciph->nexthdr || IPPROTO_UDP == ciph->nexthdr) {
-		__be16 *ports = (void *)ciph + sizeof(struct ipv6hdr);
-
-		if (inout)
-			ports[1] = cp->vport;
-		else
-			ports[0] = cp->dport;
-	}
-
-	/* And finally the ICMP checksum */
-	icmph->icmp6_cksum = 0;
-	/* TODO IPv6: is this correct for ICMPv6? */
-	ip_vs_checksum_complete(skb, icmp_offset);
-	skb->ip_summed = CHECKSUM_UNNECESSARY;
-
-	if (inout)
-		IP_VS_DBG_PKT(11, pp, skb, (void *)ciph - (void *)iph,
-			"Forwarding altered outgoing ICMPv6");
-	else
-		IP_VS_DBG_PKT(11, pp, skb, (void *)ciph - (void *)iph,
-			"Forwarding altered incoming ICMPv6");
-}
-#endif
-
-/* Handle relevant response ICMP messages - forward to the right
- * destination host. Used for NAT and local client.
- */
-static int handle_response_icmp(int af, struct sk_buff *skb,
-				union nf_inet_addr *snet,
-				__u8 protocol, struct ip_vs_conn *cp,
-				struct ip_vs_protocol *pp,
-				unsigned int offset, unsigned int ihl)
-{
-	unsigned int verdict = NF_DROP;
-
-	if (IP_VS_FWD_METHOD(cp) != 0) {
-		IP_VS_ERR("shouldn't reach here, because the box is on the "
-			  "half connection in the tun/dr module.\n");
-	}
-
-	/* Ensure the checksum is correct */
-	if (!skb_csum_unnecessary(skb) && ip_vs_checksum_complete(skb, ihl)) {
-		/* Failed checksum! */
-		IP_VS_DBG_BUF(1, "Forward ICMP: failed checksum from %s!\n",
-			      IP_VS_DBG_ADDR(af, snet));
-		goto out;
-	}
-
-	if (IPPROTO_TCP == protocol || IPPROTO_UDP == protocol)
-		offset += 2 * sizeof(__u16);
-	if (!skb_make_writable(skb, offset))
-		goto out;
-
-#ifdef CONFIG_IP_VS_IPV6
-	if (af == AF_INET6)
-		ip_vs_nat_icmp_v6(skb, pp, cp, 1);
-	else
-#endif
-		ip_vs_nat_icmp(skb, pp, cp, 1);
-
-	/* do the statistics and put it back */
-	ip_vs_out_stats(cp, skb);
-
-	skb->ipvs_property = 1;
-	verdict = NF_ACCEPT;
-
-out:
-	__ip_vs_conn_put(cp);
-
-	return verdict;
-}
-
-/*
- *	Handle ICMP messages in the inside-to-outside direction (outgoing).
- *	Find any that might be relevant, check against existing connections.
- *	Currently handles error types - unreachable, quench, ttl exceeded.
- */
-static int ip_vs_out_icmp(struct sk_buff *skb, int *related)
-{
-	struct iphdr *iph;
-	struct icmphdr	_icmph, *ic;
-	struct iphdr	_ciph, *cih;	/* The ip header contained within the ICMP */
-	struct ip_vs_iphdr ciph;
-	struct ip_vs_conn *cp;
-	struct ip_vs_protocol *pp;
-	unsigned int offset, ihl;
-	union nf_inet_addr snet;
-
-	*related = 1;
-
-	/* reassemble IP fragments */
-	if (ip_hdr(skb)->frag_off & htons(IP_MF | IP_OFFSET)) {
-		if (ip_vs_gather_frags(skb, IP_DEFRAG_VS_OUT))
-			return NF_STOLEN;
-	}
-
-	iph = ip_hdr(skb);
-	offset = ihl = iph->ihl * 4;
-	ic = skb_header_pointer(skb, offset, sizeof(_icmph), &_icmph);
-	if (ic == NULL)
-		return NF_DROP;
-
-	IP_VS_DBG(12, "Outgoing ICMP (%d,%d) %u.%u.%u.%u->%u.%u.%u.%u\n",
-		  ic->type, ntohs(icmp_id(ic)),
-		  NIPQUAD(iph->saddr), NIPQUAD(iph->daddr));
-
-	/*
-	 * Work through seeing if this is for us.
-	 * These checks are supposed to be in an order that means easy
-	 * things are checked first to speed up processing.... however
-	 * this means that some packets will manage to get a long way
-	 * down this stack and then be rejected, but that's life.
-	 */
-	if ((ic->type != ICMP_DEST_UNREACH) &&
-	    (ic->type != ICMP_SOURCE_QUENCH) &&
-	    (ic->type != ICMP_TIME_EXCEEDED)) {
-		*related = 0;
-		return NF_ACCEPT;
-	}
-
-	/* Now find the contained IP header */
-	offset += sizeof(_icmph);
-	cih = skb_header_pointer(skb, offset, sizeof(_ciph), &_ciph);
-	if (cih == NULL)
-		return NF_ACCEPT; /* The packet looks wrong, ignore */
-
-	pp = ip_vs_proto_get(cih->protocol);
-	if (!pp)
-		return NF_ACCEPT;
-
-	/* Is the embedded protocol header present? */
-	if (unlikely(cih->frag_off & htons(IP_OFFSET) &&
-		     pp->dont_defrag))
-		return NF_ACCEPT;
-
-	IP_VS_DBG_PKT(11, pp, skb, offset, "Checking outgoing ICMP for");
-
-	offset += cih->ihl * 4;
-
-	ip_vs_fill_iphdr(AF_INET, cih, &ciph);
-	/* The embedded headers contain source and dest in reverse order */
-	cp = pp->conn_out_get(AF_INET, skb, pp, &ciph, offset, 1);
-	if (!cp)
-		return NF_ACCEPT;
-
-	snet.ip = iph->saddr;
-	return handle_response_icmp(AF_INET, skb, &snet, cih->protocol, cp,
-				    pp, offset, ihl);
-}
-
-#ifdef CONFIG_IP_VS_IPV6
-static int ip_vs_out_icmp_v6(struct sk_buff *skb, int *related)
-{
-	struct ipv6hdr *iph;
-	struct icmp6hdr	_icmph, *ic;
-	struct ipv6hdr	_ciph, *cih;	/* The ip header contained
-					   within the ICMP */
-	struct ip_vs_iphdr ciph;
-	struct ip_vs_conn *cp;
-	struct ip_vs_protocol *pp;
-	unsigned int offset;
-	union nf_inet_addr snet;
-
-	*related = 1;
-
-	/* reassemble IP fragments */
-	if (ipv6_hdr(skb)->nexthdr == IPPROTO_FRAGMENT) {
-		if (ip_vs_gather_frags_v6(skb, IP_DEFRAG_VS_OUT))
-			return NF_STOLEN;
-	}
-
-	iph = ipv6_hdr(skb);
-	offset = sizeof(struct ipv6hdr);
-	ic = skb_header_pointer(skb, offset, sizeof(_icmph), &_icmph);
-	if (ic == NULL)
-		return NF_DROP;
-
-	IP_VS_DBG(12, "Outgoing ICMPv6 (%d,%d) " NIP6_FMT "->" NIP6_FMT "\n",
-		  ic->icmp6_type, ntohs(icmpv6_id(ic)),
-		  NIP6(iph->saddr), NIP6(iph->daddr));
-
-	/*
-	 * Work through seeing if this is for us.
-	 * These checks are supposed to be in an order that means easy
-	 * things are checked first to speed up processing.... however
-	 * this means that some packets will manage to get a long way
-	 * down this stack and then be rejected, but that's life.
-	 */
-	if ((ic->icmp6_type != ICMPV6_DEST_UNREACH) &&
-	    (ic->icmp6_type != ICMPV6_PKT_TOOBIG) &&
-	    (ic->icmp6_type != ICMPV6_TIME_EXCEED)) {
-		*related = 0;
-		return NF_ACCEPT;
-	}
-
-	/* Now find the contained IP header */
-	offset += sizeof(_icmph);
-	cih = skb_header_pointer(skb, offset, sizeof(_ciph), &_ciph);
-	if (cih == NULL)
-		return NF_ACCEPT; /* The packet looks wrong, ignore */
-
-	pp = ip_vs_proto_get(cih->nexthdr);
-	if (!pp)
-		return NF_ACCEPT;
-
-	/* Is the embedded protocol header present? */
-	/* TODO: we don't support fragmentation at the moment anyways */
-	if (unlikely(cih->nexthdr == IPPROTO_FRAGMENT && pp->dont_defrag))
-		return NF_ACCEPT;
-
-	IP_VS_DBG_PKT(11, pp, skb, offset, "Checking outgoing ICMPv6 for");
-
-	offset += sizeof(struct ipv6hdr);
-
-	ip_vs_fill_iphdr(AF_INET6, cih, &ciph);
-	/* The embedded headers contain source and dest in reverse order */
-	cp = pp->conn_out_get(AF_INET6, skb, pp, &ciph, offset, 1);
-	if (!cp)
-		return NF_ACCEPT;
-
-	ipv6_addr_copy(&snet.in6, &iph->saddr);
-	return handle_response_icmp(AF_INET6, skb, &snet, cih->nexthdr, cp,
-				    pp, offset, sizeof(struct ipv6hdr));
-}
-#endif
-
-static inline int is_tcp_reset(const struct sk_buff *skb, int nh_len)
-{
-	struct tcphdr _tcph, *th;
-
-	th = skb_header_pointer(skb, nh_len, sizeof(_tcph), &_tcph);
-	if (th == NULL)
-		return 0;
-	return th->rst;
-}
-
-/* Handle response packets: rewrite addresses and send away...
- * Used for NAT and local client.
- */
-static unsigned int
-handle_response(int af, struct sk_buff *skb, struct ip_vs_protocol *pp,
-		struct ip_vs_conn *cp, int ihl)
-{
-	IP_VS_DBG_PKT(11, pp, skb, 0, "Outgoing packet");
-
-	if (!skb_make_writable(skb, ihl))
-		goto drop;
-
-	/* mangle the packet */
-	if (pp->snat_handler && !pp->snat_handler(skb, pp, cp))
-		goto drop;
-
-#ifdef CONFIG_IP_VS_IPV6
-	if (af == AF_INET6)
-		ipv6_hdr(skb)->saddr = cp->vaddr.in6;
-	else
-#endif
-	{
-		ip_hdr(skb)->saddr = cp->vaddr.ip;
-		ip_send_check(ip_hdr(skb));
-	}
-
-	/* For policy routing, packets originating from this
-	 * machine itself may be routed differently to packets
-	 * passing through.  We want this packet to be routed as
-	 * if it came from this machine itself.  So re-compute
-	 * the routing information.
-	 */
-#ifdef CONFIG_IP_VS_IPV6
-	if (af == AF_INET6) {
-		if (ip6_route_me_harder(skb) != 0)
-			goto drop;
-	} else
-#endif
-		if (ip_route_me_harder(skb, RTN_LOCAL) != 0)
-			goto drop;
-
-	IP_VS_DBG_PKT(10, pp, skb, 0, "After SNAT");
-
-	ip_vs_out_stats(cp, skb);
-	ip_vs_set_state(cp, IP_VS_DIR_OUTPUT, skb, pp);
-	ip_vs_conn_put(cp);
-
-	skb->ipvs_property = 1;
-
-	LeaveFunction(11);
-	return NF_ACCEPT;
-
-drop:
-	ip_vs_conn_put(cp);
-	kfree_skb(skb);
-	return NF_STOLEN;
-}
-
-/*
- *	It is hooked at the NF_INET_FORWARD chain, used only for VS/NAT.
- *	Check if outgoing packet belongs to the established ip_vs_conn.
- */
-static unsigned int
-ip_vs_out(unsigned int hooknum, struct sk_buff *skb,
-	  const struct net_device *in, const struct net_device *out,
-	  int (*okfn)(struct sk_buff *))
-{
-	struct ip_vs_iphdr iph;
-	struct ip_vs_protocol *pp;
-	struct ip_vs_conn *cp;
-	int af;
-
-	EnterFunction(11);
-
-	af = (skb->protocol == htons(ETH_P_IP)) ? AF_INET : AF_INET6;
-
-	if (skb->ipvs_property)
-		return NF_ACCEPT;
-
-	ip_vs_fill_iphdr(af, skb_network_header(skb), &iph);
-#ifdef CONFIG_IP_VS_IPV6
-	if (af == AF_INET6) {
-		if (unlikely(iph.protocol == IPPROTO_ICMPV6)) {
-			int related, verdict = ip_vs_out_icmp_v6(skb, &related);
-
-			if (related)
-				return verdict;
-			ip_vs_fill_iphdr(af, skb_network_header(skb), &iph);
-		}
-	} else
-#endif
-		if (unlikely(iph.protocol == IPPROTO_ICMP)) {
-			int related, verdict = ip_vs_out_icmp(skb, &related);
-
-			if (related)
-				return verdict;
-			ip_vs_fill_iphdr(af, skb_network_header(skb), &iph);
-		}
-
-	pp = ip_vs_proto_get(iph.protocol);
-	if (unlikely(!pp))
-		return NF_ACCEPT;
-
-	/* reassemble IP fragments */
-#ifdef CONFIG_IP_VS_IPV6
-	if (af == AF_INET6) {
-		if (unlikely(iph.protocol == IPPROTO_ICMPV6)) {
-			int related, verdict = ip_vs_out_icmp_v6(skb, &related);
-
-			if (related)
-				return verdict;
-
-			ip_vs_fill_iphdr(af, skb_network_header(skb), &iph);
-		}
-	} else
-#endif
-		if (unlikely(ip_hdr(skb)->frag_off & htons(IP_MF|IP_OFFSET) &&
-			     !pp->dont_defrag)) {
-			if (ip_vs_gather_frags(skb, IP_DEFRAG_VS_OUT))
-				return NF_STOLEN;
-
-			ip_vs_fill_iphdr(af, skb_network_header(skb), &iph);
-		}
-
-	/*
-	 * Check if the packet belongs to an existing entry
-	 */
-	cp = pp->conn_out_get(af, skb, pp, &iph, iph.len, 0);
-
-	if (unlikely(!cp)) {
-		if (sysctl_ip_vs_nat_icmp_send &&
-		    (pp->protocol == IPPROTO_TCP ||
-		     pp->protocol == IPPROTO_UDP)) {
-			__be16 _ports[2], *pptr;
-
-			pptr = skb_header_pointer(skb, iph.len,
-						  sizeof(_ports), _ports);
-			if (pptr == NULL)
-				return NF_ACCEPT;	/* Not for me */
-			if (ip_vs_lookup_real_service(af, iph.protocol,
-						      &iph.saddr,
-						      pptr[0])) {
-				/*
-				 * Notify the real server: there is no
-				 * existing entry if it is not RST
-				 * packet or not TCP packet.
-				 */
-				if (iph.protocol != IPPROTO_TCP
-				    || !is_tcp_reset(skb, iph.len)) {
-#ifdef CONFIG_IP_VS_IPV6
-					if (af == AF_INET6)
-						icmpv6_send(skb,
-							    ICMPV6_DEST_UNREACH,
-							    ICMPV6_PORT_UNREACH,
-							    0, skb->dev);
-					else
-#endif
-						icmp_send(skb,
-							  ICMP_DEST_UNREACH,
-							  ICMP_PORT_UNREACH, 0);
-					return NF_DROP;
-				}
-			}
-		}
-		IP_VS_DBG_PKT(12, pp, skb, 0,
-			      "packet continues traversal as normal");
-		return NF_ACCEPT;
-	}
-
-	return handle_response(af, skb, pp, cp, iph.len);
-}
-
-
-/*
- *	Handle ICMP messages in the outside-to-inside direction (incoming).
- *	Find any that might be relevant, check against existing connections,
- *	forward to the right destination host if relevant.
- *	Currently handles error types - unreachable, quench, ttl exceeded.
- */
-static int
-ip_vs_in_icmp(struct sk_buff *skb, int *related, unsigned int hooknum)
-{
-	struct iphdr *iph;
-	struct icmphdr	_icmph, *ic;
-	struct iphdr	_ciph, *cih;	/* The ip header contained within the ICMP */
-	struct ip_vs_iphdr ciph;
-	struct ip_vs_conn *cp;
-	struct ip_vs_protocol *pp;
-	unsigned int offset, ihl, verdict;
-	union nf_inet_addr snet;
-
-	*related = 1;
-
-	/* reassemble IP fragments */
-	if (ip_hdr(skb)->frag_off & htons(IP_MF | IP_OFFSET)) {
-		if (ip_vs_gather_frags(skb, hooknum == NF_INET_LOCAL_IN ?
-					    IP_DEFRAG_VS_IN : IP_DEFRAG_VS_FWD))
-			return NF_STOLEN;
-	}
-
-	iph = ip_hdr(skb);
-	offset = ihl = iph->ihl * 4;
-	ic = skb_header_pointer(skb, offset, sizeof(_icmph), &_icmph);
-	if (ic == NULL)
-		return NF_DROP;
-
-	IP_VS_DBG(12, "Incoming ICMP (%d,%d) %u.%u.%u.%u->%u.%u.%u.%u\n",
-		  ic->type, ntohs(icmp_id(ic)),
-		  NIPQUAD(iph->saddr), NIPQUAD(iph->daddr));
-
-	/*
-	 * Work through seeing if this is for us.
-	 * These checks are supposed to be in an order that means easy
-	 * things are checked first to speed up processing.... however
-	 * this means that some packets will manage to get a long way
-	 * down this stack and then be rejected, but that's life.
-	 */
-	if ((ic->type != ICMP_DEST_UNREACH) &&
-	    (ic->type != ICMP_SOURCE_QUENCH) &&
-	    (ic->type != ICMP_TIME_EXCEEDED)) {
-		*related = 0;
-		return NF_ACCEPT;
-	}
-
-	/* Now find the contained IP header */
-	offset += sizeof(_icmph);
-	cih = skb_header_pointer(skb, offset, sizeof(_ciph), &_ciph);
-	if (cih == NULL)
-		return NF_ACCEPT; /* The packet looks wrong, ignore */
-
-	pp = ip_vs_proto_get(cih->protocol);
-	if (!pp)
-		return NF_ACCEPT;
-
-	/* Is the embedded protocol header present? */
-	if (unlikely(cih->frag_off & htons(IP_OFFSET) &&
-		     pp->dont_defrag))
-		return NF_ACCEPT;
-
-	IP_VS_DBG_PKT(11, pp, skb, offset, "Checking incoming ICMP for");
-
-	offset += cih->ihl * 4;
-
-	ip_vs_fill_iphdr(AF_INET, cih, &ciph);
-	/* The embedded headers contain source and dest in reverse order */
-	cp = pp->conn_in_get(AF_INET, skb, pp, &ciph, offset, 1);
-	if (!cp) {
-		/* The packet could also belong to a local client */
-		cp = pp->conn_out_get(AF_INET, skb, pp, &ciph, offset, 1);
-		if (cp) {
-			snet.ip = iph->saddr;
-			return handle_response_icmp(AF_INET, skb, &snet,
-						    cih->protocol, cp, pp,
-						    offset, ihl);
-		}
-		return NF_ACCEPT;
-	}
-
-	verdict = NF_DROP;
-
-	/* Ensure the checksum is correct */
-	if (!skb_csum_unnecessary(skb) && ip_vs_checksum_complete(skb, ihl)) {
-		/* Failed checksum! */
-		IP_VS_DBG(1, "Incoming ICMP: failed checksum from %d.%d.%d.%d!\n",
-			  NIPQUAD(iph->saddr));
-		goto out;
-	}
-
-	/* do the statistics and put it back */
-	ip_vs_in_stats(cp, skb);
-	if (IPPROTO_TCP == cih->protocol || IPPROTO_UDP == cih->protocol)
-		offset += 2 * sizeof(__u16);
-	verdict = ip_vs_icmp_xmit(skb, cp, pp, offset);
-	/* do not touch skb anymore */
-
-  out:
-	__ip_vs_conn_put(cp);
-
-	return verdict;
-}
-
-#ifdef CONFIG_IP_VS_IPV6
-static int
-ip_vs_in_icmp_v6(struct sk_buff *skb, int *related, unsigned int hooknum)
-{
-	struct ipv6hdr *iph;
-	struct icmp6hdr	_icmph, *ic;
-	struct ipv6hdr	_ciph, *cih;	/* The ip header contained
-					   within the ICMP */
-	struct ip_vs_iphdr ciph;
-	struct ip_vs_conn *cp;
-	struct ip_vs_protocol *pp;
-	unsigned int offset, verdict;
-	union nf_inet_addr snet;
-
-	*related = 1;
-
-	/* reassemble IP fragments */
-	if (ipv6_hdr(skb)->nexthdr == IPPROTO_FRAGMENT) {
-		if (ip_vs_gather_frags_v6(skb, hooknum == NF_INET_LOCAL_IN ?
-					       IP_DEFRAG_VS_IN :
-					       IP_DEFRAG_VS_FWD))
-			return NF_STOLEN;
-	}
-
-	iph = ipv6_hdr(skb);
-	offset = sizeof(struct ipv6hdr);
-	ic = skb_header_pointer(skb, offset, sizeof(_icmph), &_icmph);
-	if (ic == NULL)
-		return NF_DROP;
-
-	IP_VS_DBG(12, "Incoming ICMPv6 (%d,%d) " NIP6_FMT "->" NIP6_FMT "\n",
-		  ic->icmp6_type, ntohs(icmpv6_id(ic)),
-		  NIP6(iph->saddr), NIP6(iph->daddr));
-
-	/*
-	 * Work through seeing if this is for us.
-	 * These checks are supposed to be in an order that means easy
-	 * things are checked first to speed up processing.... however
-	 * this means that some packets will manage to get a long way
-	 * down this stack and then be rejected, but that's life.
-	 */
-	if ((ic->icmp6_type != ICMPV6_DEST_UNREACH) &&
-	    (ic->icmp6_type != ICMPV6_PKT_TOOBIG) &&
-	    (ic->icmp6_type != ICMPV6_TIME_EXCEED)) {
-		*related = 0;
-		return NF_ACCEPT;
-	}
-
-	/* Now find the contained IP header */
-	offset += sizeof(_icmph);
-	cih = skb_header_pointer(skb, offset, sizeof(_ciph), &_ciph);
-	if (cih == NULL)
-		return NF_ACCEPT; /* The packet looks wrong, ignore */
-
-	pp = ip_vs_proto_get(cih->nexthdr);
-	if (!pp)
-		return NF_ACCEPT;
-
-	/* Is the embedded protocol header present? */
-	/* TODO: we don't support fragmentation at the moment anyways */
-	if (unlikely(cih->nexthdr == IPPROTO_FRAGMENT && pp->dont_defrag))
-		return NF_ACCEPT;
-
-	IP_VS_DBG_PKT(11, pp, skb, offset, "Checking incoming ICMPv6 for");
-
-	offset += sizeof(struct ipv6hdr);
-
-	ip_vs_fill_iphdr(AF_INET6, cih, &ciph);
-	/* The embedded headers contain source and dest in reverse order */
-	cp = pp->conn_in_get(AF_INET6, skb, pp, &ciph, offset, 1);
-	if (!cp) {
-		/* The packet could also belong to a local client */
-		cp = pp->conn_out_get(AF_INET6, skb, pp, &ciph, offset, 1);
-		if (cp) {
-			ipv6_addr_copy(&snet.in6, &iph->saddr);
-			return handle_response_icmp(AF_INET6, skb, &snet,
-						    cih->nexthdr,
-						    cp, pp, offset,
-						    sizeof(struct ipv6hdr));
-		}
-		return NF_ACCEPT;
-	}
-
-	verdict = NF_DROP;
-
-	/* do the statistics and put it back */
-	ip_vs_in_stats(cp, skb);
-	if (IPPROTO_TCP == cih->nexthdr || IPPROTO_UDP == cih->nexthdr)
-		offset += 2 * sizeof(__u16);
-	verdict = ip_vs_icmp_xmit_v6(skb, cp, pp, offset);
-	/* do not touch skb anymore */
-
-	__ip_vs_conn_put(cp);
-
-	return verdict;
-}
-#endif
-
-
-/*
- *	Check if it's for virtual services, look it up,
- *	and send it on its way...
- */
-static unsigned int
-ip_vs_in(unsigned int hooknum, struct sk_buff *skb,
-	 const struct net_device *in, const struct net_device *out,
-	 int (*okfn)(struct sk_buff *))
-{
-	struct ip_vs_iphdr iph;
-	struct ip_vs_protocol *pp;
-	struct ip_vs_conn *cp;
-	int ret, restart, af;
-
-	af = (skb->protocol == htons(ETH_P_IP)) ? AF_INET : AF_INET6;
-
-	ip_vs_fill_iphdr(af, skb_network_header(skb), &iph);
-
-	/*
-	 *	Big tappo: only PACKET_HOST, including loopback for local client
-	 *	Don't handle local packets on IPv6 for now
-	 */
-	if (unlikely(skb->pkt_type != PACKET_HOST)) {
-		IP_VS_DBG_BUF(12, "packet type=%d proto=%d daddr=%s ignored\n",
-			      skb->pkt_type,
-			      iph.protocol,
-			      IP_VS_DBG_ADDR(af, &iph.daddr));
-		return NF_ACCEPT;
-	}
-
-	if (unlikely(iph.protocol == IPPROTO_ICMP)) {
-		int related, verdict = ip_vs_in_icmp(skb, &related, hooknum);
-
-		if (related)
-			return verdict;
-		ip_vs_fill_iphdr(af, skb_network_header(skb), &iph);
-	}
-
-	/* Protocol supported? */
-	pp = ip_vs_proto_get(iph.protocol);
-	if (unlikely(!pp))
-		return NF_ACCEPT;
-
-	/*
-	 * Check if the packet belongs to an existing connection entry
-	 */
-	cp = pp->conn_in_get(af, skb, pp, &iph, iph.len, 0);
-
-	if (unlikely(!cp)) {
-		int v;
-
-		/* For local client packets, it could be a response */
-		cp = pp->conn_out_get(af, skb, pp, &iph, iph.len, 0);
-		if (cp)
-			return handle_response(af, skb, pp, cp, iph.len);
-
-		if (!pp->conn_schedule(af, skb, pp, &v, &cp))
-			return v;
-	}
-
-	if (unlikely(!cp)) {
-		/* sorry, all this trouble for a no-hit :) */
-		IP_VS_DBG_PKT(12, pp, skb, 0,
-			      "packet continues traversal as normal");
-		return NF_ACCEPT;
-	}
-
-	IP_VS_DBG_PKT(11, pp, skb, 0, "Incoming packet");
-
-	/* Check the server status */
-	if (cp->dest && !(cp->dest->flags & IP_VS_DEST_F_AVAILABLE)) {
-		/* the destination server is not available */
-
-		if (sysctl_ip_vs_expire_nodest_conn) {
-			/* try to expire the connection immediately */
-			ip_vs_conn_expire_now(cp);
-		}
-		/* don't restart its timer, and silently
-		   drop the packet. */
-		__ip_vs_conn_put(cp);
-		return NF_DROP;
-	}
-
-	ip_vs_in_stats(cp, skb);
-	restart = ip_vs_set_state(cp, IP_VS_DIR_INPUT, skb, pp);
-	if (cp->packet_xmit)
-		ret = cp->packet_xmit(skb, cp, pp);
-		/* do not touch skb anymore */
-	else {
-		IP_VS_DBG_RL("warning: packet_xmit is null");
-		ret = NF_ACCEPT;
-	}
-
-	/* Increase its packet counter and check if it is needed
-	 * to be synchronized
-	 *
-	 * Sync connection if it is about to close to
-	 * encorage the standby servers to update the connections timeout
-	 */
-	atomic_inc(&cp->in_pkts);
-	if (af == AF_INET &&
-	    (ip_vs_sync_state & IP_VS_STATE_MASTER) &&
-	    (((cp->protocol != IPPROTO_TCP ||
-	       cp->state == IP_VS_TCP_S_ESTABLISHED) &&
-	      (atomic_read(&cp->in_pkts) % sysctl_ip_vs_sync_threshold[1]
-	       == sysctl_ip_vs_sync_threshold[0])) ||
-	     ((cp->protocol == IPPROTO_TCP) && (cp->old_state != cp->state) &&
-	      ((cp->state == IP_VS_TCP_S_FIN_WAIT) ||
-	       (cp->state == IP_VS_TCP_S_CLOSE_WAIT) ||
-	       (cp->state == IP_VS_TCP_S_TIME_WAIT)))))
-		ip_vs_sync_conn(cp);
-	cp->old_state = cp->state;
-
-	ip_vs_conn_put(cp);
-	return ret;
-}
-
-
-/*
- *	It is hooked at the NF_INET_FORWARD chain, in order to catch ICMP
- *      related packets destined for 0.0.0.0/0.
- *      When fwmark-based virtual service is used, such as transparent
- *      cache cluster, TCP packets can be marked and routed to ip_vs_in,
- *      but ICMP destined for 0.0.0.0/0 cannot not be easily marked and
- *      sent to ip_vs_in_icmp. So, catch them at the NF_INET_FORWARD chain
- *      and send them to ip_vs_in_icmp.
- */
-static unsigned int
-ip_vs_forward_icmp(unsigned int hooknum, struct sk_buff *skb,
-		   const struct net_device *in, const struct net_device *out,
-		   int (*okfn)(struct sk_buff *))
-{
-	int r;
-
-	if (ip_hdr(skb)->protocol != IPPROTO_ICMP)
-		return NF_ACCEPT;
-
-	return ip_vs_in_icmp(skb, &r, hooknum);
-}
-
-#ifdef CONFIG_IP_VS_IPV6
-static unsigned int
-ip_vs_forward_icmp_v6(unsigned int hooknum, struct sk_buff *skb,
-		      const struct net_device *in, const struct net_device *out,
-		      int (*okfn)(struct sk_buff *))
-{
-	int r;
-
-	if (ipv6_hdr(skb)->nexthdr != IPPROTO_ICMPV6)
-		return NF_ACCEPT;
-
-	return ip_vs_in_icmp_v6(skb, &r, hooknum);
-}
-#endif
-
-
-static struct nf_hook_ops ip_vs_ops[] __read_mostly = {
-	/* After packet filtering, forward packet through VS/DR, VS/TUN,
-	 * or VS/NAT(change destination), so that filtering rules can be
-	 * applied to IPVS. */
-	{
-		.hook		= ip_vs_in,
-		.owner		= THIS_MODULE,
-		.pf		= PF_INET,
-		.hooknum        = NF_INET_LOCAL_IN,
-		.priority       = 100,
-	},
-	/* After packet filtering, change source only for VS/NAT */
-	{
-		.hook		= ip_vs_out,
-		.owner		= THIS_MODULE,
-		.pf		= PF_INET,
-		.hooknum        = NF_INET_FORWARD,
-		.priority       = 100,
-	},
-	/* After packet filtering (but before ip_vs_out_icmp), catch icmp
-	 * destined for 0.0.0.0/0, which is for incoming IPVS connections */
-	{
-		.hook		= ip_vs_forward_icmp,
-		.owner		= THIS_MODULE,
-		.pf		= PF_INET,
-		.hooknum        = NF_INET_FORWARD,
-		.priority       = 99,
-	},
-	/* Before the netfilter connection tracking, exit from POST_ROUTING */
-	{
-		.hook		= ip_vs_post_routing,
-		.owner		= THIS_MODULE,
-		.pf		= PF_INET,
-		.hooknum        = NF_INET_POST_ROUTING,
-		.priority       = NF_IP_PRI_NAT_SRC-1,
-	},
-#ifdef CONFIG_IP_VS_IPV6
-	/* After packet filtering, forward packet through VS/DR, VS/TUN,
-	 * or VS/NAT(change destination), so that filtering rules can be
-	 * applied to IPVS. */
-	{
-		.hook		= ip_vs_in,
-		.owner		= THIS_MODULE,
-		.pf		= PF_INET6,
-		.hooknum        = NF_INET_LOCAL_IN,
-		.priority       = 100,
-	},
-	/* After packet filtering, change source only for VS/NAT */
-	{
-		.hook		= ip_vs_out,
-		.owner		= THIS_MODULE,
-		.pf		= PF_INET6,
-		.hooknum        = NF_INET_FORWARD,
-		.priority       = 100,
-	},
-	/* After packet filtering (but before ip_vs_out_icmp), catch icmp
-	 * destined for 0.0.0.0/0, which is for incoming IPVS connections */
-	{
-		.hook		= ip_vs_forward_icmp_v6,
-		.owner		= THIS_MODULE,
-		.pf		= PF_INET6,
-		.hooknum        = NF_INET_FORWARD,
-		.priority       = 99,
-	},
-	/* Before the netfilter connection tracking, exit from POST_ROUTING */
-	{
-		.hook		= ip_vs_post_routing,
-		.owner		= THIS_MODULE,
-		.pf		= PF_INET6,
-		.hooknum        = NF_INET_POST_ROUTING,
-		.priority       = NF_IP6_PRI_NAT_SRC-1,
-	},
-#endif
-};
-
-
-/*
- *	Initialize IP Virtual Server
- */
-static int __init ip_vs_init(void)
-{
-	int ret;
-
-	ip_vs_estimator_init();
-
-	ret = ip_vs_control_init();
-	if (ret < 0) {
-		IP_VS_ERR("can't setup control.\n");
-		goto cleanup_estimator;
-	}
-
-	ip_vs_protocol_init();
-
-	ret = ip_vs_app_init();
-	if (ret < 0) {
-		IP_VS_ERR("can't setup application helper.\n");
-		goto cleanup_protocol;
-	}
-
-	ret = ip_vs_conn_init();
-	if (ret < 0) {
-		IP_VS_ERR("can't setup connection table.\n");
-		goto cleanup_app;
-	}
-
-	ret = nf_register_hooks(ip_vs_ops, ARRAY_SIZE(ip_vs_ops));
-	if (ret < 0) {
-		IP_VS_ERR("can't register hooks.\n");
-		goto cleanup_conn;
-	}
-
-	IP_VS_INFO("ipvs loaded.\n");
-	return ret;
-
-  cleanup_conn:
-	ip_vs_conn_cleanup();
-  cleanup_app:
-	ip_vs_app_cleanup();
-  cleanup_protocol:
-	ip_vs_protocol_cleanup();
-	ip_vs_control_cleanup();
-  cleanup_estimator:
-	ip_vs_estimator_cleanup();
-	return ret;
-}
-
-static void __exit ip_vs_cleanup(void)
-{
-	nf_unregister_hooks(ip_vs_ops, ARRAY_SIZE(ip_vs_ops));
-	ip_vs_conn_cleanup();
-	ip_vs_app_cleanup();
-	ip_vs_protocol_cleanup();
-	ip_vs_control_cleanup();
-	ip_vs_estimator_cleanup();
-	IP_VS_INFO("ipvs unloaded.\n");
-}
-
-module_init(ip_vs_init);
-module_exit(ip_vs_cleanup);
-MODULE_LICENSE("GPL");