netdev - [PATCH RFC 04/24] IPVS: Change IPVS data structures to support IPv6 addresses

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Date:	Wed, 20 Aug 2008 18:15:11 +0200
From:	Julius Volz <juliusv@...gle.com>
To:	netdev@...r.kernel.org, lvs-devel@...r.kernel.org
Cc:	horms@...ge.net.au, kaber@...sh.net, vbusam@...gle.com,
	Julius Volz <juliusv@...gle.com>
Subject: [PATCH RFC 04/24] IPVS: Change IPVS data structures to support IPv6 addresses

Introduce new 'af' fields into IPVS data structures for specifying an
entry's address family. Convert IP addresses to be of type union
nf_inet_addr. Add extended internal versions of ip_vs_service_user and
struct ip_vs_dest_user (the originals can't be modified as they are part
of the old sockopt interface).

Signed-off-by: Julius Volz <juliusv@...gle.com>

 1 files changed, 51 insertions(+), 6 deletions(-)

diff --git a/include/net/ip_vs.h b/include/net/ip_vs.h
index 7312c3d..e41a164 100644
--- a/include/net/ip_vs.h
+++ b/include/net/ip_vs.h
@@ -21,6 +21,9 @@
 #include <linux/timer.h>
 
 #include <net/checksum.h>
+#include <linux/netfilter.h>		/* for union nf_inet_addr */
+#include <linux/ipv6.h>			/* for struct ipv6hdr */
+#include <net/ipv6.h>			/* for ipv6_addr_copy */
 
 #ifdef CONFIG_IP_VS_DEBUG
 #include <linux/net.h>
@@ -259,9 +262,10 @@ struct ip_vs_conn {
 	struct list_head        c_list;         /* hashed list heads */
 
 	/* Protocol, addresses and port numbers */
-	__be32                   caddr;          /* client address */
-	__be32                   vaddr;          /* virtual address */
-	__be32                   daddr;          /* destination address */
+	u_int16_t               af;		/* address family */
+	union nf_inet_addr       caddr;          /* client address */
+	union nf_inet_addr       vaddr;          /* virtual address */
+	union nf_inet_addr       daddr;          /* destination address */
 	__be16                   cport;
 	__be16                   vport;
 	__be16                   dport;
@@ -305,6 +309,45 @@ struct ip_vs_conn {
 
 
 /*
+ *	Extended internal versions of struct ip_vs_service_user and
+ *	ip_vs_dest_user for IPv6 support.
+ *
+ *	We need these to conveniently pass around service and destination
+ *	options, but unfortunately, we also need to keep the old definitions to
+ *	maintain userspace backwards compatibility for the setsockopt interface.
+ */
+struct ip_vs_service_user_kern {
+	/* virtual service addresses */
+	u_int16_t		af;
+	u_int16_t		protocol;
+	union nf_inet_addr	addr;		/* virtual ip address */
+	__be16			port;
+	u_int32_t		fwmark;		/* firwall mark of service */
+
+	/* virtual service options */
+	char			*sched_name;
+	unsigned		flags;		/* virtual service flags */
+	unsigned		timeout;	/* persistent timeout in sec */
+	__be32			netmask;	/* persistent netmask */
+};
+
+
+struct ip_vs_dest_user_kern {
+	/* destination server address */
+	union nf_inet_addr	addr;
+	__be16			port;
+
+	/* real server options */
+	unsigned		conn_flags;	/* connection flags */
+	int			weight;		/* destination weight */
+
+	/* thresholds for active connections */
+	u_int32_t		u_threshold;	/* upper threshold */
+	u_int32_t		l_threshold;	/* lower threshold */
+};
+
+
+/*
  *	The information about the virtual service offered to the net
  *	and the forwarding entries
  */
@@ -314,8 +357,9 @@ struct ip_vs_service {
 	atomic_t		refcnt;   /* reference counter */
 	atomic_t		usecnt;   /* use counter */
 
+	u_int16_t               af;       /* address family */
 	__u16			protocol; /* which protocol (TCP/UDP) */
-	__be32			addr;	  /* IP address for virtual service */
+	union nf_inet_addr	addr;	  /* IP address for virtual service */
 	__be16			port;	  /* port number for the service */
 	__u32                   fwmark;   /* firewall mark of the service */
 	unsigned		flags;	  /* service status flags */
@@ -342,7 +386,8 @@ struct ip_vs_dest {
 	struct list_head	n_list;   /* for the dests in the service */
 	struct list_head	d_list;   /* for table with all the dests */
 
-	__be32			addr;		/* IP address of the server */
+	u_int16_t		af;		/* address family */
+	union nf_inet_addr	addr;		/* IP address of the server */
 	__be16			port;		/* port number of the server */
 	volatile unsigned	flags;		/* dest status flags */
 	atomic_t		conn_flags;	/* flags to copy to conn */
@@ -366,7 +411,7 @@ struct ip_vs_dest {
 	/* for virtual service */
 	struct ip_vs_service	*svc;		/* service it belongs to */
 	__u16			protocol;	/* which protocol (TCP/UDP) */
-	__be32			vaddr;		/* virtual IP address */
+	union nf_inet_addr	vaddr;		/* virtual IP address */
 	__be16			vport;		/* virtual port number */
 	__u32			vfwmark;	/* firewall mark of service */
 };
-- 
1.5.4.5

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