[RTNETLINK]: Add rtnl_put_cacheinfo() to unify some code

IPv4, IPv6, and DECNet all use struct rta_cacheinfo in a similiar
way, therefore rtnl_put_cacheinfo() is added to reuse code.

Signed-off-by: Thomas Graf <tgraf@suug.ch>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 20 insertions, 0 deletions

diff --git a/net/core/rtnetlink.c b/net/core/rtnetlink.c
index 0cb4d9e53a0..e76539a5eb5 100644
--- a/net/core/rtnetlink.c
+++ b/net/core/rtnetlink.c
@@ -212,6 +212,26 @@ nla_put_failure:
         return nla_nest_cancel(skb, mx);
 }
 
+int rtnl_put_cacheinfo(struct sk_buff *skb, struct dst_entry *dst, u32 id,
+                       u32 ts, u32 tsage, long expires, u32 error)
+{
+        struct rta_cacheinfo ci = {
+                .rta_lastuse = jiffies_to_clock_t(jiffies - dst->lastuse),
+                .rta_used = dst->__use,
+                .rta_clntref = atomic_read(&(dst->__refcnt)),
+                .rta_error = error,
+                .rta_id =  id,
+                .rta_ts = ts,
+                .rta_tsage = tsage,
+        };
+
+        if (expires)
+                ci.rta_expires = jiffies_to_clock_t(expires);
+
+        return nla_put(skb, RTA_CACHEINFO, sizeof(ci), &ci);
+}
+
+EXPORT_SYMBOL_GPL(rtnl_put_cacheinfo);
 
 static void set_operstate(struct net_device *dev, unsigned char transition)
 {