net: ipv6: Introduce ip6_sk_dst_hoplimit.

This replaces 6 identical code snippets with a call to a new
static inline function.

Signed-off-by: Lorenzo Colitti <lorenzo@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 19 insertions, 0 deletions

diff --git a/include/net/ipv6.h b/include/net/ipv6.h
index d640925bc454..5b40ad297b8c 100644
--- a/include/net/ipv6.h
+++ b/include/net/ipv6.h
@@ -583,6 +583,11 @@ static inline bool ipv6_addr_orchid(const struct in6_addr *a)
         return (a->s6_addr32[0] & htonl(0xfffffff0)) == htonl(0x20010010);
 }
 
+static inline bool ipv6_addr_is_multicast(const struct in6_addr *addr)
+{
+        return (addr->s6_addr32[0] & htonl(0xFF000000)) == htonl(0xFF000000);
+}
+
 static inline void ipv6_addr_set_v4mapped(const __be32 addr,
                                           struct in6_addr *v4mapped)
 {
@@ -664,6 +669,20 @@ void ipv6_select_ident(struct frag_hdr *fhdr, struct rt6_info *rt);
 
 int ip6_dst_hoplimit(struct dst_entry *dst);
 
+static inline int ip6_sk_dst_hoplimit(struct ipv6_pinfo *np, struct flowi6 *fl6,
+                                      struct dst_entry *dst)
+{
+        int hlimit;
+
+        if (ipv6_addr_is_multicast(&fl6->daddr))
+                hlimit = np->mcast_hops;
+        else
+                hlimit = np->hop_limit;
+        if (hlimit < 0)
+                hlimit = ip6_dst_hoplimit(dst);
+        return hlimit;
+}
+
 /*
  *      Header manipulation
  */