1 files changed, 640 insertions, 0 deletions

diff --git a/net/ipv4/ipvs/ip_vs_proto_tcp.c b/net/ipv4/ipvs/ip_vs_proto_tcp.c
new file mode 100644
index 000000000000..e65de675da74
--- /dev/null
+++ b/net/ipv4/ipvs/ip_vs_proto_tcp.c
@@ -0,0 +1,640 @@
+/*
+ * ip_vs_proto_tcp.c:	TCP load balancing support for IPVS
+ *
+ * Version:     $Id: ip_vs_proto_tcp.c,v 1.3 2002/11/30 01:50:35 wensong Exp $
+ *
+ * Authors:     Wensong Zhang <wensong@linuxvirtualserver.org>
+ *              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.
+ *
+ * Changes:
+ *
+ */
+
+#include <linux/kernel.h>
+#include <linux/ip.h>
+#include <linux/tcp.h>                  /* for tcphdr */
+#include <net/ip.h>
+#include <net/tcp.h>                    /* for csum_tcpudp_magic */
+#include <linux/netfilter_ipv4.h>
+
+#include <net/ip_vs.h>
+
+
+static struct ip_vs_conn *
+tcp_conn_in_get(const struct sk_buff *skb, struct ip_vs_protocol *pp,
+		const struct iphdr *iph, unsigned int proto_off, int inverse)
+{
+	__u16 _ports[2], *pptr;
+
+	pptr = skb_header_pointer(skb, proto_off, sizeof(_ports), _ports);
+	if (pptr == NULL)
+		return NULL;
+
+	if (likely(!inverse)) {
+		return ip_vs_conn_in_get(iph->protocol,
+					 iph->saddr, pptr[0],
+					 iph->daddr, pptr[1]);
+	} else {
+		return ip_vs_conn_in_get(iph->protocol,
+					 iph->daddr, pptr[1],
+					 iph->saddr, pptr[0]);
+	}
+}
+
+static struct ip_vs_conn *
+tcp_conn_out_get(const struct sk_buff *skb, struct ip_vs_protocol *pp,
+		 const struct iphdr *iph, unsigned int proto_off, int inverse)
+{
+	__u16 _ports[2], *pptr;
+
+	pptr = skb_header_pointer(skb, proto_off, sizeof(_ports), _ports);
+	if (pptr == NULL)
+		return NULL;
+
+	if (likely(!inverse)) {
+		return ip_vs_conn_out_get(iph->protocol,
+					  iph->saddr, pptr[0],
+					  iph->daddr, pptr[1]);
+	} else {
+		return ip_vs_conn_out_get(iph->protocol,
+					  iph->daddr, pptr[1],
+					  iph->saddr, pptr[0]);
+	}
+}
+
+
+static int
+tcp_conn_schedule(struct sk_buff *skb,
+		  struct ip_vs_protocol *pp,
+		  int *verdict, struct ip_vs_conn **cpp)
+{
+	struct ip_vs_service *svc;
+	struct tcphdr _tcph, *th;
+
+	th = skb_header_pointer(skb, skb->nh.iph->ihl*4,
+				sizeof(_tcph), &_tcph);
+	if (th == NULL) {
+		*verdict = NF_DROP;
+		return 0;
+	}
+
+	if (th->syn &&
+	    (svc = ip_vs_service_get(skb->nfmark, skb->nh.iph->protocol,
+				     skb->nh.iph->daddr, th->dest))) {
+		if (ip_vs_todrop()) {
+			/*
+			 * It seems that we are very loaded.
+			 * We have to drop this packet :(
+			 */
+			ip_vs_service_put(svc);
+			*verdict = NF_DROP;
+			return 0;
+		}
+
+		/*
+		 * Let the virtual server select a real server for the
+		 * incoming connection, and create a connection entry.
+		 */
+		*cpp = ip_vs_schedule(svc, skb);
+		if (!*cpp) {
+			*verdict = ip_vs_leave(svc, skb, pp);
+			return 0;
+		}
+		ip_vs_service_put(svc);
+	}
+	return 1;
+}
+
+
+static inline void
+tcp_fast_csum_update(struct tcphdr *tcph, u32 oldip, u32 newip,
+		     u16 oldport, u16 newport)
+{
+	tcph->check =
+		ip_vs_check_diff(~oldip, newip,
+				 ip_vs_check_diff(oldport ^ 0xFFFF,
+						  newport, tcph->check));
+}
+
+
+static int
+tcp_snat_handler(struct sk_buff **pskb,
+		 struct ip_vs_protocol *pp, struct ip_vs_conn *cp)
+{
+	struct tcphdr *tcph;
+	unsigned int tcphoff = (*pskb)->nh.iph->ihl * 4;
+
+	/* csum_check requires unshared skb */
+	if (!ip_vs_make_skb_writable(pskb, tcphoff+sizeof(*tcph)))
+		return 0;
+
+	if (unlikely(cp->app != NULL)) {
+		/* Some checks before mangling */
+		if (pp->csum_check && !pp->csum_check(*pskb, pp))
+			return 0;
+
+		/* Call application helper if needed */
+		if (!ip_vs_app_pkt_out(cp, pskb))
+			return 0;
+	}
+
+	tcph = (void *)(*pskb)->nh.iph + tcphoff;
+	tcph->source = cp->vport;
+
+	/* Adjust TCP checksums */
+	if (!cp->app) {
+		/* Only port and addr are changed, do fast csum update */
+		tcp_fast_csum_update(tcph, cp->daddr, cp->vaddr,
+				     cp->dport, cp->vport);
+		if ((*pskb)->ip_summed == CHECKSUM_HW)
+			(*pskb)->ip_summed = CHECKSUM_NONE;
+	} else {
+		/* full checksum calculation */
+		tcph->check = 0;
+		(*pskb)->csum = skb_checksum(*pskb, tcphoff,
+					     (*pskb)->len - tcphoff, 0);
+		tcph->check = csum_tcpudp_magic(cp->vaddr, cp->caddr,
+						(*pskb)->len - tcphoff,
+						cp->protocol,
+						(*pskb)->csum);
+		IP_VS_DBG(11, "O-pkt: %s O-csum=%d (+%zd)\n",
+			  pp->name, tcph->check,
+			  (char*)&(tcph->check) - (char*)tcph);
+	}
+	return 1;
+}
+
+
+static int
+tcp_dnat_handler(struct sk_buff **pskb,
+		 struct ip_vs_protocol *pp, struct ip_vs_conn *cp)
+{
+	struct tcphdr *tcph;
+	unsigned int tcphoff = (*pskb)->nh.iph->ihl * 4;
+
+	/* csum_check requires unshared skb */
+	if (!ip_vs_make_skb_writable(pskb, tcphoff+sizeof(*tcph)))
+		return 0;
+
+	if (unlikely(cp->app != NULL)) {
+		/* Some checks before mangling */
+		if (pp->csum_check && !pp->csum_check(*pskb, pp))
+			return 0;
+
+		/*
+		 *	Attempt ip_vs_app call.
+		 *	It will fix ip_vs_conn and iph ack_seq stuff
+		 */
+		if (!ip_vs_app_pkt_in(cp, pskb))
+			return 0;
+	}
+
+	tcph = (void *)(*pskb)->nh.iph + tcphoff;
+	tcph->dest = cp->dport;
+
+	/*
+	 *	Adjust TCP checksums
+	 */
+	if (!cp->app) {
+		/* Only port and addr are changed, do fast csum update */
+		tcp_fast_csum_update(tcph, cp->vaddr, cp->daddr,
+				     cp->vport, cp->dport);
+		if ((*pskb)->ip_summed == CHECKSUM_HW)
+			(*pskb)->ip_summed = CHECKSUM_NONE;
+	} else {
+		/* full checksum calculation */
+		tcph->check = 0;
+		(*pskb)->csum = skb_checksum(*pskb, tcphoff,
+					     (*pskb)->len - tcphoff, 0);
+		tcph->check = csum_tcpudp_magic(cp->caddr, cp->daddr,
+						(*pskb)->len - tcphoff,
+						cp->protocol,
+						(*pskb)->csum);
+		(*pskb)->ip_summed = CHECKSUM_UNNECESSARY;
+	}
+	return 1;
+}
+
+
+static int
+tcp_csum_check(struct sk_buff *skb, struct ip_vs_protocol *pp)
+{
+	unsigned int tcphoff = skb->nh.iph->ihl*4;
+
+	switch (skb->ip_summed) {
+	case CHECKSUM_NONE:
+		skb->csum = skb_checksum(skb, tcphoff, skb->len - tcphoff, 0);
+	case CHECKSUM_HW:
+		if (csum_tcpudp_magic(skb->nh.iph->saddr, skb->nh.iph->daddr,
+				      skb->len - tcphoff,
+				      skb->nh.iph->protocol, skb->csum)) {
+			IP_VS_DBG_RL_PKT(0, pp, skb, 0,
+					 "Failed checksum for");
+			return 0;
+		}
+		break;
+	default:
+		/* CHECKSUM_UNNECESSARY */
+		break;
+	}
+
+	return 1;
+}
+
+
+#define TCP_DIR_INPUT		0
+#define TCP_DIR_OUTPUT		4
+#define TCP_DIR_INPUT_ONLY	8
+
+static int tcp_state_off[IP_VS_DIR_LAST] = {
+	[IP_VS_DIR_INPUT]		=	TCP_DIR_INPUT,
+	[IP_VS_DIR_OUTPUT]		=	TCP_DIR_OUTPUT,
+	[IP_VS_DIR_INPUT_ONLY]		=	TCP_DIR_INPUT_ONLY,
+};
+
+/*
+ *	Timeout table[state]
+ */
+static int tcp_timeouts[IP_VS_TCP_S_LAST+1] = {
+	[IP_VS_TCP_S_NONE]		=	2*HZ,
+	[IP_VS_TCP_S_ESTABLISHED]	=	15*60*HZ,
+	[IP_VS_TCP_S_SYN_SENT]		=	2*60*HZ,
+	[IP_VS_TCP_S_SYN_RECV]		=	1*60*HZ,
+	[IP_VS_TCP_S_FIN_WAIT]		=	2*60*HZ,
+	[IP_VS_TCP_S_TIME_WAIT]		=	2*60*HZ,
+	[IP_VS_TCP_S_CLOSE]		=	10*HZ,
+	[IP_VS_TCP_S_CLOSE_WAIT]	=	60*HZ,
+	[IP_VS_TCP_S_LAST_ACK]		=	30*HZ,
+	[IP_VS_TCP_S_LISTEN]		=	2*60*HZ,
+	[IP_VS_TCP_S_SYNACK]		=	120*HZ,
+	[IP_VS_TCP_S_LAST]		=	2*HZ,
+};
+
+
+#if 0
+
+/* FIXME: This is going to die */
+
+static int tcp_timeouts_dos[IP_VS_TCP_S_LAST+1] = {
+	[IP_VS_TCP_S_NONE]		=	2*HZ,
+	[IP_VS_TCP_S_ESTABLISHED]	=	8*60*HZ,
+	[IP_VS_TCP_S_SYN_SENT]		=	60*HZ,
+	[IP_VS_TCP_S_SYN_RECV]		=	10*HZ,
+	[IP_VS_TCP_S_FIN_WAIT]		=	60*HZ,
+	[IP_VS_TCP_S_TIME_WAIT]		=	60*HZ,
+	[IP_VS_TCP_S_CLOSE]		=	10*HZ,
+	[IP_VS_TCP_S_CLOSE_WAIT]	=	60*HZ,
+	[IP_VS_TCP_S_LAST_ACK]		=	30*HZ,
+	[IP_VS_TCP_S_LISTEN]		=	2*60*HZ,
+	[IP_VS_TCP_S_SYNACK]		=	100*HZ,
+	[IP_VS_TCP_S_LAST]		=	2*HZ,
+};
+
+#endif
+
+static char * tcp_state_name_table[IP_VS_TCP_S_LAST+1] = {
+	[IP_VS_TCP_S_NONE]		=	"NONE",
+	[IP_VS_TCP_S_ESTABLISHED]	=	"ESTABLISHED",
+	[IP_VS_TCP_S_SYN_SENT]		=	"SYN_SENT",
+	[IP_VS_TCP_S_SYN_RECV]		=	"SYN_RECV",
+	[IP_VS_TCP_S_FIN_WAIT]		=	"FIN_WAIT",
+	[IP_VS_TCP_S_TIME_WAIT]		=	"TIME_WAIT",
+	[IP_VS_TCP_S_CLOSE]		=	"CLOSE",
+	[IP_VS_TCP_S_CLOSE_WAIT]	=	"CLOSE_WAIT",
+	[IP_VS_TCP_S_LAST_ACK]		=	"LAST_ACK",
+	[IP_VS_TCP_S_LISTEN]		=	"LISTEN",
+	[IP_VS_TCP_S_SYNACK]		=	"SYNACK",
+	[IP_VS_TCP_S_LAST]		=	"BUG!",
+};
+
+#define sNO IP_VS_TCP_S_NONE
+#define sES IP_VS_TCP_S_ESTABLISHED
+#define sSS IP_VS_TCP_S_SYN_SENT
+#define sSR IP_VS_TCP_S_SYN_RECV
+#define sFW IP_VS_TCP_S_FIN_WAIT
+#define sTW IP_VS_TCP_S_TIME_WAIT
+#define sCL IP_VS_TCP_S_CLOSE
+#define sCW IP_VS_TCP_S_CLOSE_WAIT
+#define sLA IP_VS_TCP_S_LAST_ACK
+#define sLI IP_VS_TCP_S_LISTEN
+#define sSA IP_VS_TCP_S_SYNACK
+
+struct tcp_states_t {
+	int next_state[IP_VS_TCP_S_LAST];
+};
+
+static const char * tcp_state_name(int state)
+{
+	if (state >= IP_VS_TCP_S_LAST)
+		return "ERR!";
+	return tcp_state_name_table[state] ? tcp_state_name_table[state] : "?";
+}
+
+static struct tcp_states_t tcp_states [] = {
+/*	INPUT */
+/*        sNO, sES, sSS, sSR, sFW, sTW, sCL, sCW, sLA, sLI, sSA	*/
+/*syn*/ {{sSR, sES, sES, sSR, sSR, sSR, sSR, sSR, sSR, sSR, sSR }},
+/*fin*/ {{sCL, sCW, sSS, sTW, sTW, sTW, sCL, sCW, sLA, sLI, sTW }},
+/*ack*/ {{sCL, sES, sSS, sES, sFW, sTW, sCL, sCW, sCL, sLI, sES }},
+/*rst*/ {{sCL, sCL, sCL, sSR, sCL, sCL, sCL, sCL, sLA, sLI, sSR }},
+
+/*	OUTPUT */
+/*        sNO, sES, sSS, sSR, sFW, sTW, sCL, sCW, sLA, sLI, sSA	*/
+/*syn*/ {{sSS, sES, sSS, sSR, sSS, sSS, sSS, sSS, sSS, sLI, sSR }},
+/*fin*/ {{sTW, sFW, sSS, sTW, sFW, sTW, sCL, sTW, sLA, sLI, sTW }},
+/*ack*/ {{sES, sES, sSS, sES, sFW, sTW, sCL, sCW, sLA, sES, sES }},
+/*rst*/ {{sCL, sCL, sSS, sCL, sCL, sTW, sCL, sCL, sCL, sCL, sCL }},
+
+/*	INPUT-ONLY */
+/*        sNO, sES, sSS, sSR, sFW, sTW, sCL, sCW, sLA, sLI, sSA	*/
+/*syn*/ {{sSR, sES, sES, sSR, sSR, sSR, sSR, sSR, sSR, sSR, sSR }},
+/*fin*/ {{sCL, sFW, sSS, sTW, sFW, sTW, sCL, sCW, sLA, sLI, sTW }},
+/*ack*/ {{sCL, sES, sSS, sES, sFW, sTW, sCL, sCW, sCL, sLI, sES }},
+/*rst*/ {{sCL, sCL, sCL, sSR, sCL, sCL, sCL, sCL, sLA, sLI, sCL }},
+};
+
+static struct tcp_states_t tcp_states_dos [] = {
+/*	INPUT */
+/*        sNO, sES, sSS, sSR, sFW, sTW, sCL, sCW, sLA, sLI, sSA	*/
+/*syn*/ {{sSR, sES, sES, sSR, sSR, sSR, sSR, sSR, sSR, sSR, sSA }},
+/*fin*/ {{sCL, sCW, sSS, sTW, sTW, sTW, sCL, sCW, sLA, sLI, sSA }},
+/*ack*/ {{sCL, sES, sSS, sSR, sFW, sTW, sCL, sCW, sCL, sLI, sSA }},
+/*rst*/ {{sCL, sCL, sCL, sSR, sCL, sCL, sCL, sCL, sLA, sLI, sCL }},
+
+/*	OUTPUT */
+/*        sNO, sES, sSS, sSR, sFW, sTW, sCL, sCW, sLA, sLI, sSA	*/
+/*syn*/ {{sSS, sES, sSS, sSA, sSS, sSS, sSS, sSS, sSS, sLI, sSA }},
+/*fin*/ {{sTW, sFW, sSS, sTW, sFW, sTW, sCL, sTW, sLA, sLI, sTW }},
+/*ack*/ {{sES, sES, sSS, sES, sFW, sTW, sCL, sCW, sLA, sES, sES }},
+/*rst*/ {{sCL, sCL, sSS, sCL, sCL, sTW, sCL, sCL, sCL, sCL, sCL }},
+
+/*	INPUT-ONLY */
+/*        sNO, sES, sSS, sSR, sFW, sTW, sCL, sCW, sLA, sLI, sSA	*/
+/*syn*/ {{sSA, sES, sES, sSR, sSA, sSA, sSA, sSA, sSA, sSA, sSA }},
+/*fin*/ {{sCL, sFW, sSS, sTW, sFW, sTW, sCL, sCW, sLA, sLI, sTW }},
+/*ack*/ {{sCL, sES, sSS, sES, sFW, sTW, sCL, sCW, sCL, sLI, sES }},
+/*rst*/ {{sCL, sCL, sCL, sSR, sCL, sCL, sCL, sCL, sLA, sLI, sCL }},
+};
+
+static struct tcp_states_t *tcp_state_table = tcp_states;
+
+
+static void tcp_timeout_change(struct ip_vs_protocol *pp, int flags)
+{
+	int on = (flags & 1);		/* secure_tcp */
+
+	/*
+	** FIXME: change secure_tcp to independent sysctl var
+	** or make it per-service or per-app because it is valid
+	** for most if not for all of the applications. Something
+	** like "capabilities" (flags) for each object.
+	*/
+	tcp_state_table = (on? tcp_states_dos : tcp_states);
+}
+
+static int
+tcp_set_state_timeout(struct ip_vs_protocol *pp, char *sname, int to)
+{
+	return ip_vs_set_state_timeout(pp->timeout_table, IP_VS_TCP_S_LAST,
+				       tcp_state_name_table, sname, to);
+}
+
+static inline int tcp_state_idx(struct tcphdr *th)
+{
+	if (th->rst)
+		return 3;
+	if (th->syn)
+		return 0;
+	if (th->fin)
+		return 1;
+	if (th->ack)
+		return 2;
+	return -1;
+}
+
+static inline void
+set_tcp_state(struct ip_vs_protocol *pp, struct ip_vs_conn *cp,
+	      int direction, struct tcphdr *th)
+{
+	int state_idx;
+	int new_state = IP_VS_TCP_S_CLOSE;
+	int state_off = tcp_state_off[direction];
+
+	/*
+	 *    Update state offset to INPUT_ONLY if necessary
+	 *    or delete NO_OUTPUT flag if output packet detected
+	 */
+	if (cp->flags & IP_VS_CONN_F_NOOUTPUT) {
+		if (state_off == TCP_DIR_OUTPUT)
+			cp->flags &= ~IP_VS_CONN_F_NOOUTPUT;
+		else
+			state_off = TCP_DIR_INPUT_ONLY;
+	}
+
+	if ((state_idx = tcp_state_idx(th)) < 0) {
+		IP_VS_DBG(8, "tcp_state_idx=%d!!!\n", state_idx);
+		goto tcp_state_out;
+	}
+
+	new_state = tcp_state_table[state_off+state_idx].next_state[cp->state];
+
+  tcp_state_out:
+	if (new_state != cp->state) {
+		struct ip_vs_dest *dest = cp->dest;
+
+		IP_VS_DBG(8, "%s %s [%c%c%c%c] %u.%u.%u.%u:%d->"
+			  "%u.%u.%u.%u:%d state: %s->%s cnt:%d\n",
+			  pp->name,
+			  (state_off==TCP_DIR_OUTPUT)?"output ":"input ",
+			  th->syn? 'S' : '.',
+			  th->fin? 'F' : '.',
+			  th->ack? 'A' : '.',
+			  th->rst? 'R' : '.',
+			  NIPQUAD(cp->daddr), ntohs(cp->dport),
+			  NIPQUAD(cp->caddr), ntohs(cp->cport),
+			  tcp_state_name(cp->state),
+			  tcp_state_name(new_state),
+			  atomic_read(&cp->refcnt));
+		if (dest) {
+			if (!(cp->flags & IP_VS_CONN_F_INACTIVE) &&
+			    (new_state != IP_VS_TCP_S_ESTABLISHED)) {
+				atomic_dec(&dest->activeconns);
+				atomic_inc(&dest->inactconns);
+				cp->flags |= IP_VS_CONN_F_INACTIVE;
+			} else if ((cp->flags & IP_VS_CONN_F_INACTIVE) &&
+				   (new_state == IP_VS_TCP_S_ESTABLISHED)) {
+				atomic_inc(&dest->activeconns);
+				atomic_dec(&dest->inactconns);
+				cp->flags &= ~IP_VS_CONN_F_INACTIVE;
+			}
+		}
+	}
+
+	cp->timeout = pp->timeout_table[cp->state = new_state];
+}
+
+
+/*
+ *	Handle state transitions
+ */
+static int
+tcp_state_transition(struct ip_vs_conn *cp, int direction,
+		     const struct sk_buff *skb,
+		     struct ip_vs_protocol *pp)
+{
+	struct tcphdr _tcph, *th;
+
+	th = skb_header_pointer(skb, skb->nh.iph->ihl*4,
+				sizeof(_tcph), &_tcph);
+	if (th == NULL)
+		return 0;
+
+	spin_lock(&cp->lock);
+	set_tcp_state(pp, cp, direction, th);
+	spin_unlock(&cp->lock);
+
+	return 1;
+}
+
+
+/*
+ *	Hash table for TCP application incarnations
+ */
+#define	TCP_APP_TAB_BITS	4
+#define	TCP_APP_TAB_SIZE	(1 << TCP_APP_TAB_BITS)
+#define	TCP_APP_TAB_MASK	(TCP_APP_TAB_SIZE - 1)
+
+static struct list_head tcp_apps[TCP_APP_TAB_SIZE];
+static DEFINE_SPINLOCK(tcp_app_lock);
+
+static inline __u16 tcp_app_hashkey(__u16 port)
+{
+	return ((port >> TCP_APP_TAB_BITS) ^ port) & TCP_APP_TAB_MASK;
+}
+
+
+static int tcp_register_app(struct ip_vs_app *inc)
+{
+	struct ip_vs_app *i;
+	__u16 hash, port = inc->port;
+	int ret = 0;
+
+	hash = tcp_app_hashkey(port);
+
+	spin_lock_bh(&tcp_app_lock);
+	list_for_each_entry(i, &tcp_apps[hash], p_list) {
+		if (i->port == port) {
+			ret = -EEXIST;
+			goto out;
+		}
+	}
+	list_add(&inc->p_list, &tcp_apps[hash]);
+	atomic_inc(&ip_vs_protocol_tcp.appcnt);
+
+  out:
+	spin_unlock_bh(&tcp_app_lock);
+	return ret;
+}
+
+
+static void
+tcp_unregister_app(struct ip_vs_app *inc)
+{
+	spin_lock_bh(&tcp_app_lock);
+	atomic_dec(&ip_vs_protocol_tcp.appcnt);
+	list_del(&inc->p_list);
+	spin_unlock_bh(&tcp_app_lock);
+}
+
+
+static int
+tcp_app_conn_bind(struct ip_vs_conn *cp)
+{
+	int hash;
+	struct ip_vs_app *inc;
+	int result = 0;
+
+	/* Default binding: bind app only for NAT */
+	if (IP_VS_FWD_METHOD(cp) != IP_VS_CONN_F_MASQ)
+		return 0;
+
+	/* Lookup application incarnations and bind the right one */
+	hash = tcp_app_hashkey(cp->vport);
+
+	spin_lock(&tcp_app_lock);
+	list_for_each_entry(inc, &tcp_apps[hash], p_list) {
+		if (inc->port == cp->vport) {
+			if (unlikely(!ip_vs_app_inc_get(inc)))
+				break;
+			spin_unlock(&tcp_app_lock);
+
+			IP_VS_DBG(9, "%s: Binding conn %u.%u.%u.%u:%u->"
+				  "%u.%u.%u.%u:%u to app %s on port %u\n",
+				  __FUNCTION__,
+				  NIPQUAD(cp->caddr), ntohs(cp->cport),
+				  NIPQUAD(cp->vaddr), ntohs(cp->vport),
+				  inc->name, ntohs(inc->port));
+			cp->app = inc;
+			if (inc->init_conn)
+				result = inc->init_conn(inc, cp);
+			goto out;
+		}
+	}
+	spin_unlock(&tcp_app_lock);
+
+  out:
+	return result;
+}
+
+
+/*
+ *	Set LISTEN timeout. (ip_vs_conn_put will setup timer)
+ */
+void ip_vs_tcp_conn_listen(struct ip_vs_conn *cp)
+{
+	spin_lock(&cp->lock);
+	cp->state = IP_VS_TCP_S_LISTEN;
+	cp->timeout = ip_vs_protocol_tcp.timeout_table[IP_VS_TCP_S_LISTEN];
+	spin_unlock(&cp->lock);
+}
+
+
+static void tcp_init(struct ip_vs_protocol *pp)
+{
+	IP_VS_INIT_HASH_TABLE(tcp_apps);
+	pp->timeout_table = tcp_timeouts;
+}
+
+
+static void tcp_exit(struct ip_vs_protocol *pp)
+{
+}
+
+
+struct ip_vs_protocol ip_vs_protocol_tcp = {
+	.name =			"TCP",
+	.protocol =		IPPROTO_TCP,
+	.dont_defrag =		0,
+	.appcnt =		ATOMIC_INIT(0),
+	.init =			tcp_init,
+	.exit =			tcp_exit,
+	.register_app =		tcp_register_app,
+	.unregister_app =	tcp_unregister_app,
+	.conn_schedule =	tcp_conn_schedule,
+	.conn_in_get =		tcp_conn_in_get,
+	.conn_out_get =		tcp_conn_out_get,
+	.snat_handler =		tcp_snat_handler,
+	.dnat_handler =		tcp_dnat_handler,
+	.csum_check =		tcp_csum_check,
+	.state_name =		tcp_state_name,
+	.state_transition =	tcp_state_transition,
+	.app_conn_bind =	tcp_app_conn_bind,
+	.debug_packet =		ip_vs_tcpudp_debug_packet,
+	.timeout_change =	tcp_timeout_change,
+	.set_state_timeout =	tcp_set_state_timeout,
+};