inetpeer: Add metrics storage to inetpeer entries.

#include <linux/init.h>

#include <linux/jiffies.h>

#include <linux/spinlock.h>

#include <linux/rtnetlink.h>

#include <net/ipv6.h>

#include <asm/atomic.h>

	atomic_t		refcnt;

	/*

	 * Once inet_peer is queued for deletion (refcnt == -1), following fields

	 * are not available: rid, ip_id_count, tcp_ts, tcp_ts_stamp

	 * We can share memory with rcu_head to keep inet_peer small

	 * are not available: rid, ip_id_count, tcp_ts, tcp_ts_stamp, metrics

	 * We can share memory with rcu_head to help keep inet_peer small.

	 */

	union {

		struct {

			atomic_t	ip_id_count;	/* IP ID for the next packet */

			__u32		tcp_ts;

			__u32		tcp_ts_stamp;

			u32		metrics[RTAX_MAX];

		};

		struct rcu_head         rcu;

	};