29 files changed, 266 insertions, 3 deletions
diff --git a/net/ipv4/Kconfig b/net/ipv4/Kconfig
index 591ea23..691268f 100644
--- a/net/ipv4/Kconfig
+++ b/net/ipv4/Kconfig
@@ -630,5 +630,3 @@ config TCP_MD5SIG
 
 	  If unsure, say N.
 
-source "net/ipv4/ipvs/Kconfig"
-
diff --git a/net/ipv4/Makefile b/net/ipv4/Makefile
index ad40ef3..80ff87c 100644
--- a/net/ipv4/Makefile
+++ b/net/ipv4/Makefile
@@ -33,7 +33,6 @@ obj-$(CONFIG_INET_XFRM_MODE_TRANSPORT) += xfrm4_mode_transport.o
 obj-$(CONFIG_INET_XFRM_MODE_TUNNEL) += xfrm4_mode_tunnel.o
 obj-$(CONFIG_IP_PNP) += ipconfig.o
 obj-$(CONFIG_NETFILTER)	+= netfilter.o netfilter/
-obj-$(CONFIG_IP_VS) += ipvs/
 obj-$(CONFIG_INET_DIAG) += inet_diag.o 
 obj-$(CONFIG_INET_TCP_DIAG) += tcp_diag.o
 obj-$(CONFIG_NET_TCPPROBE) += tcp_probe.o
diff --git a/net/netfilter/Kconfig b/net/netfilter/Kconfig
index ee898e7..73f9378 100644
--- a/net/netfilter/Kconfig
+++ b/net/netfilter/Kconfig
@@ -838,3 +838,5 @@ config NETFILTER_XT_MATCH_HASHLIMIT
 
 endmenu
 
+source "net/netfilter/ipvs/Kconfig"
+
diff --git a/net/netfilter/Makefile b/net/netfilter/Makefile
index 3bd2cc5..cf75055 100644
--- a/net/netfilter/Makefile
+++ b/net/netfilter/Makefile
@@ -83,3 +83,6 @@ obj-$(CONFIG_NETFILTER_XT_MATCH_STRING) += xt_string.o
 obj-$(CONFIG_NETFILTER_XT_MATCH_TCPMSS) += xt_tcpmss.o
 obj-$(CONFIG_NETFILTER_XT_MATCH_TIME) += xt_time.o
 obj-$(CONFIG_NETFILTER_XT_MATCH_U32) += xt_u32.o
+
+# IPVS
+obj-$(CONFIG_IP_VS) += ipvs/
diff --git a/net/ipv4/ipvs/Kconfig b/net/netfilter/ipvs/Kconfig
index de6004d..de6004d 100644
--- a/net/ipv4/ipvs/Kconfig
+++ b/net/netfilter/ipvs/Kconfig
diff --git a/net/ipv4/ipvs/Makefile b/net/netfilter/ipvs/Makefile
index 73a46fe..73a46fe 100644
--- a/net/ipv4/ipvs/Makefile
+++ b/net/netfilter/ipvs/Makefile
diff --git a/net/ipv4/ipvs/ip_vs_app.c b/net/netfilter/ipvs/ip_vs_app.c
index 201b8ea..201b8ea 100644
--- a/net/ipv4/ipvs/ip_vs_app.c
+++ b/net/netfilter/ipvs/ip_vs_app.c
diff --git a/net/ipv4/ipvs/ip_vs_conn.c b/net/netfilter/ipvs/ip_vs_conn.c
index 9a24332..9a24332 100644
--- a/net/ipv4/ipvs/ip_vs_conn.c
+++ b/net/netfilter/ipvs/ip_vs_conn.c
diff --git a/net/ipv4/ipvs/ip_vs_core.c b/net/netfilter/ipvs/ip_vs_core.c
index 958abf3..958abf3 100644
--- a/net/ipv4/ipvs/ip_vs_core.c
+++ b/net/netfilter/ipvs/ip_vs_core.c
diff --git a/net/ipv4/ipvs/ip_vs_ctl.c b/net/netfilter/ipvs/ip_vs_ctl.c
index 0302cf3..0302cf3 100644
--- a/net/ipv4/ipvs/ip_vs_ctl.c
+++ b/net/netfilter/ipvs/ip_vs_ctl.c
diff --git a/net/netfilter/ipvs/ip_vs_dh.c b/net/netfilter/ipvs/ip_vs_dh.c
new file mode 100644
index 0000000..a16943f
--- /dev/null
+++ b/net/netfilter/ipvs/ip_vs_dh.c
@@ -0,0 +1,261 @@
+/*
+ * IPVS:        Destination Hashing scheduling module
+ *
+ * Authors:     Wensong Zhang <wensong@gnuchina.org>
+ *
+ *              Inspired by the consistent hashing scheduler patch from
+ *              Thomas Proell <proellt@gmx.de>
+ *
+ *              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:
+ *
+ */
+
+/*
+ * The dh algorithm is to select server by the hash key of destination IP
+ * address. The pseudo code is as follows:
+ *
+ *       n <- servernode[dest_ip];
+ *       if (n is dead) OR
+ *          (n is overloaded) OR (n.weight <= 0) then
+ *                 return NULL;
+ *
+ *       return n;
+ *
+ * Notes that servernode is a 256-bucket hash table that maps the hash
+ * index derived from packet destination IP address to the current server
+ * array. If the dh scheduler is used in cache cluster, it is good to
+ * combine it with cache_bypass feature. When the statically assigned
+ * server is dead or overloaded, the load balancer can bypass the cache
+ * server and send requests to the original server directly.
+ *
+ */
+
+#include <linux/ip.h>
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/skbuff.h>
+
+#include <net/ip_vs.h>
+
+
+/*
+ *      IPVS DH bucket
+ */
+struct ip_vs_dh_bucket {
+	struct ip_vs_dest       *dest;          /* real server (cache) */
+};
+
+/*
+ *     for IPVS DH entry hash table
+ */
+#ifndef CONFIG_IP_VS_DH_TAB_BITS
+#define CONFIG_IP_VS_DH_TAB_BITS        8
+#endif
+#define IP_VS_DH_TAB_BITS               CONFIG_IP_VS_DH_TAB_BITS
+#define IP_VS_DH_TAB_SIZE               (1 << IP_VS_DH_TAB_BITS)
+#define IP_VS_DH_TAB_MASK               (IP_VS_DH_TAB_SIZE - 1)
+
+
+/*
+ *	Returns hash value for IPVS DH entry
+ */
+static inline unsigned ip_vs_dh_hashkey(__be32 addr)
+{
+	return (ntohl(addr)*2654435761UL) & IP_VS_DH_TAB_MASK;
+}
+
+
+/*
+ *      Get ip_vs_dest associated with supplied parameters.
+ */
+static inline struct ip_vs_dest *
+ip_vs_dh_get(struct ip_vs_dh_bucket *tbl, __be32 addr)
+{
+	return (tbl[ip_vs_dh_hashkey(addr)]).dest;
+}
+
+
+/*
+ *      Assign all the hash buckets of the specified table with the service.
+ */
+static int
+ip_vs_dh_assign(struct ip_vs_dh_bucket *tbl, struct ip_vs_service *svc)
+{
+	int i;
+	struct ip_vs_dh_bucket *b;
+	struct list_head *p;
+	struct ip_vs_dest *dest;
+
+	b = tbl;
+	p = &svc->destinations;
+	for (i=0; i<IP_VS_DH_TAB_SIZE; i++) {
+		if (list_empty(p)) {
+			b->dest = NULL;
+		} else {
+			if (p == &svc->destinations)
+				p = p->next;
+
+			dest = list_entry(p, struct ip_vs_dest, n_list);
+			atomic_inc(&dest->refcnt);
+			b->dest = dest;
+
+			p = p->next;
+		}
+		b++;
+	}
+	return 0;
+}
+
+
+/*
+ *      Flush all the hash buckets of the specified table.
+ */
+static void ip_vs_dh_flush(struct ip_vs_dh_bucket *tbl)
+{
+	int i;
+	struct ip_vs_dh_bucket *b;
+
+	b = tbl;
+	for (i=0; i<IP_VS_DH_TAB_SIZE; i++) {
+		if (b->dest) {
+			atomic_dec(&b->dest->refcnt);
+			b->dest = NULL;
+		}
+		b++;
+	}
+}
+
+
+static int ip_vs_dh_init_svc(struct ip_vs_service *svc)
+{
+	struct ip_vs_dh_bucket *tbl;
+
+	/* allocate the DH table for this service */
+	tbl = kmalloc(sizeof(struct ip_vs_dh_bucket)*IP_VS_DH_TAB_SIZE,
+		      GFP_ATOMIC);
+	if (tbl == NULL) {
+		IP_VS_ERR("ip_vs_dh_init_svc(): no memory\n");
+		return -ENOMEM;
+	}
+	svc->sched_data = tbl;
+	IP_VS_DBG(6, "DH hash table (memory=%Zdbytes) allocated for "
+		  "current service\n",
+		  sizeof(struct ip_vs_dh_bucket)*IP_VS_DH_TAB_SIZE);
+
+	/* assign the hash buckets with the updated service */
+	ip_vs_dh_assign(tbl, svc);
+
+	return 0;
+}
+
+
+static int ip_vs_dh_done_svc(struct ip_vs_service *svc)
+{
+	struct ip_vs_dh_bucket *tbl = svc->sched_data;
+
+	/* got to clean up hash buckets here */
+	ip_vs_dh_flush(tbl);
+
+	/* release the table itself */
+	kfree(svc->sched_data);
+	IP_VS_DBG(6, "DH hash table (memory=%Zdbytes) released\n",
+		  sizeof(struct ip_vs_dh_bucket)*IP_VS_DH_TAB_SIZE);
+
+	return 0;
+}
+
+
+static int ip_vs_dh_update_svc(struct ip_vs_service *svc)
+{
+	struct ip_vs_dh_bucket *tbl = svc->sched_data;
+
+	/* got to clean up hash buckets here */
+	ip_vs_dh_flush(tbl);
+
+	/* assign the hash buckets with the updated service */
+	ip_vs_dh_assign(tbl, svc);
+
+	return 0;
+}
+
+
+/*
+ *      If the dest flags is set with IP_VS_DEST_F_OVERLOAD,
+ *      consider that the server is overloaded here.
+ */
+static inline int is_overloaded(struct ip_vs_dest *dest)
+{
+	return dest->flags & IP_VS_DEST_F_OVERLOAD;
+}
+
+
+/*
+ *      Destination hashing scheduling
+ */
+static struct ip_vs_dest *
+ip_vs_dh_schedule(struct ip_vs_service *svc, const struct sk_buff *skb)
+{
+	struct ip_vs_dest *dest;
+	struct ip_vs_dh_bucket *tbl;
+	struct iphdr *iph = ip_hdr(skb);
+
+	IP_VS_DBG(6, "ip_vs_dh_schedule(): Scheduling...\n");
+
+	tbl = (struct ip_vs_dh_bucket *)svc->sched_data;
+	dest = ip_vs_dh_get(tbl, iph->daddr);
+	if (!dest
+	    || !(dest->flags & IP_VS_DEST_F_AVAILABLE)
+	    || atomic_read(&dest->weight) <= 0
+	    || is_overloaded(dest)) {
+		return NULL;
+	}
+
+	IP_VS_DBG(6, "DH: destination IP address %u.%u.%u.%u "
+		  "--> server %u.%u.%u.%u:%d\n",
+		  NIPQUAD(iph->daddr),
+		  NIPQUAD(dest->addr.ip),
+		  ntohs(dest->port));
+
+	return dest;
+}
+
+
+/*
+ *      IPVS DH Scheduler structure
+ */
+static struct ip_vs_scheduler ip_vs_dh_scheduler =
+{
+	.name =			"dh",
+	.refcnt =		ATOMIC_INIT(0),
+	.module =		THIS_MODULE,
+	.n_list =		LIST_HEAD_INIT(ip_vs_dh_scheduler.n_list),
+#ifdef CONFIG_IP_VS_IPV6
+	.supports_ipv6 =	0,
+#endif
+	.init_service =		ip_vs_dh_init_svc,
+	.done_service =		ip_vs_dh_done_svc,
+	.update_service =	ip_vs_dh_update_svc,
+	.schedule =		ip_vs_dh_schedule,
+};
+
+
+static int __init ip_vs_dh_init(void)
+{
+	return register_ip_vs_scheduler(&ip_vs_dh_scheduler);
+}
+
+
+static void __exit ip_vs_dh_cleanup(void)
+{
+	unregister_ip_vs_scheduler(&ip_vs_dh_scheduler);
+}
+
+
+module_init(ip_vs_dh_init);
+module_exit(ip_vs_dh_cleanup);
+MODULE_LICENSE("GPL");
diff --git a/net/ipv4/ipvs/ip_vs_est.c b/net/netfilter/ipvs/ip_vs_est.c
index 2eb2860..2eb2860 100644
--- a/net/ipv4/ipvs/ip_vs_est.c
+++ b/net/netfilter/ipvs/ip_vs_est.c
diff --git a/net/ipv4/ipvs/ip_vs_ftp.c b/net/netfilter/ipvs/ip_vs_ftp.c
index 2e7dbd8..2e7dbd8 100644
--- a/net/ipv4/ipvs/ip_vs_ftp.c
+++ b/net/netfilter/ipvs/ip_vs_ftp.c
diff --git a/net/ipv4/ipvs/ip_vs_lblc.c b/net/netfilter/ipvs/ip_vs_lblc.c
index 6ecef35..6ecef35 100644
--- a/net/ipv4/ipvs/ip_vs_lblc.c
+++ b/net/netfilter/ipvs/ip_vs_lblc.c
diff --git a/net/ipv4/ipvs/ip_vs_lblcr.c b/net/netfilter/ipvs/ip_vs_lblcr.c
index 1f75ea8..1f75ea8 100644
--- a/net/ipv4/ipvs/ip_vs_lblcr.c
+++ b/net/netfilter/ipvs/ip_vs_lblcr.c
diff --git a/net/ipv4/ipvs/ip_vs_lc.c b/net/netfilter/ipvs/ip_vs_lc.c
index b69f808..b69f808 100644
--- a/net/ipv4/ipvs/ip_vs_lc.c
+++ b/net/netfilter/ipvs/ip_vs_lc.c
diff --git a/net/ipv4/ipvs/ip_vs_nq.c b/net/netfilter/ipvs/ip_vs_nq.c
index 9a2d803..9a2d803 100644
--- a/net/ipv4/ipvs/ip_vs_nq.c
+++ b/net/netfilter/ipvs/ip_vs_nq.c
diff --git a/net/ipv4/ipvs/ip_vs_proto.c b/net/netfilter/ipvs/ip_vs_proto.c
index 0791f9e..0791f9e 100644
--- a/net/ipv4/ipvs/ip_vs_proto.c
+++ b/net/netfilter/ipvs/ip_vs_proto.c
diff --git a/net/ipv4/ipvs/ip_vs_proto_ah_esp.c b/net/netfilter/ipvs/ip_vs_proto_ah_esp.c
index 80ab0c8..80ab0c8 100644
--- a/net/ipv4/ipvs/ip_vs_proto_ah_esp.c
+++ b/net/netfilter/ipvs/ip_vs_proto_ah_esp.c
diff --git a/net/ipv4/ipvs/ip_vs_proto_tcp.c b/net/netfilter/ipvs/ip_vs_proto_tcp.c
index dd4566e..dd4566e 100644
--- a/net/ipv4/ipvs/ip_vs_proto_tcp.c
+++ b/net/netfilter/ipvs/ip_vs_proto_tcp.c
diff --git a/net/ipv4/ipvs/ip_vs_proto_udp.c b/net/netfilter/ipvs/ip_vs_proto_udp.c
index 6eb6039..6eb6039 100644
--- a/net/ipv4/ipvs/ip_vs_proto_udp.c
+++ b/net/netfilter/ipvs/ip_vs_proto_udp.c
diff --git a/net/ipv4/ipvs/ip_vs_rr.c b/net/netfilter/ipvs/ip_vs_rr.c
index a22195f..a22195f 100644
--- a/net/ipv4/ipvs/ip_vs_rr.c
+++ b/net/netfilter/ipvs/ip_vs_rr.c
diff --git a/net/ipv4/ipvs/ip_vs_sched.c b/net/netfilter/ipvs/ip_vs_sched.c
index a46ad9e..a46ad9e 100644
--- a/net/ipv4/ipvs/ip_vs_sched.c
+++ b/net/netfilter/ipvs/ip_vs_sched.c
diff --git a/net/ipv4/ipvs/ip_vs_sed.c b/net/netfilter/ipvs/ip_vs_sed.c
index 7d2f22f..7d2f22f 100644
--- a/net/ipv4/ipvs/ip_vs_sed.c
+++ b/net/netfilter/ipvs/ip_vs_sed.c
diff --git a/net/ipv4/ipvs/ip_vs_sh.c b/net/netfilter/ipvs/ip_vs_sh.c
index 1d96de2..1d96de2 100644
--- a/net/ipv4/ipvs/ip_vs_sh.c
+++ b/net/netfilter/ipvs/ip_vs_sh.c
diff --git a/net/ipv4/ipvs/ip_vs_sync.c b/net/netfilter/ipvs/ip_vs_sync.c
index de5e7e1..de5e7e1 100644
--- a/net/ipv4/ipvs/ip_vs_sync.c
+++ b/net/netfilter/ipvs/ip_vs_sync.c
diff --git a/net/ipv4/ipvs/ip_vs_wlc.c b/net/netfilter/ipvs/ip_vs_wlc.c
index 8c596e7..8c596e7 100644
--- a/net/ipv4/ipvs/ip_vs_wlc.c
+++ b/net/netfilter/ipvs/ip_vs_wlc.c
diff --git a/net/ipv4/ipvs/ip_vs_wrr.c b/net/netfilter/ipvs/ip_vs_wrr.c
index 7ea92fe..7ea92fe 100644
--- a/net/ipv4/ipvs/ip_vs_wrr.c
+++ b/net/netfilter/ipvs/ip_vs_wrr.c
diff --git a/net/ipv4/ipvs/ip_vs_xmit.c b/net/netfilter/ipvs/ip_vs_xmit.c
index 02ddc2b..02ddc2b 100644
--- a/net/ipv4/ipvs/ip_vs_xmit.c
+++ b/net/netfilter/ipvs/ip_vs_xmit.c