ipv6: Optmize translation between IPV6_PREFER_SRC_xxx and RT6_LOOKUP_F_xxx.

[net-next-2.6.git] / include / net / ip6_route.h

diff --git a/include/net/ip6_route.h b/include/net/ip6_route.h
index 4a808de7c0f620fc65e01720001196977f9f3aa3..68f67836e1464599c64d3743649b25b82b2688f6 100644 (file)
--- a/include/net/ip6_route.h
+++ b/include/net/ip6_route.h
@@ -37,6 +37,24 @@ struct route_info {
 #define RT6_LOOKUP_F_SRCPREF_PUBLIC    0x00000010
 #define RT6_LOOKUP_F_SRCPREF_COA       0x00000020
 
+/*
+ * rt6_srcprefs2flags() and rt6_flags2srcprefs() translate
+ * between IPV6_ADDR_PREFERENCES socket option values
+ *     IPV6_PREFER_SRC_TMP    = 0x1
+ *     IPV6_PREFER_SRC_PUBLIC = 0x2
+ *     IPV6_PREFER_SRC_COA    = 0x4
+ * and above RT6_LOOKUP_F_SRCPREF_xxx flags.
+ */
+static inline int rt6_srcprefs2flags(unsigned int srcprefs)
+{
+       /* No need to bitmask because srcprefs have only 3 bits. */
+       return srcprefs << 3;
+}
+
+static inline unsigned int rt6_flags2srcprefs(int flags)
+{
+       return (flags >> 3) & 7;
+}
 
 extern void                    ip6_route_input(struct sk_buff *skb);