netdev - [PATCH net-next 1/3] ipv6: introdcue __ipv6_addr_needs_scope_id and ipv6_iface_scope

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Message-ID: <20130212221629.GA7162@order.stressinduktion.org>
Date:	Tue, 12 Feb 2013 23:16:29 +0100
From:	Hannes Frederic Sowa <hannes@...essinduktion.org>
To:	netdev@...r.kernel.org
Cc:	yoshfuji@...ux-ipv6.org
Subject: [PATCH net-next 1/3] ipv6: introdcue __ipv6_addr_needs_scope_id and ipv6_iface_scope_id helper functions

Suggested-by: YOSHIFUJI Hideaki <yoshfuji@...ux-ipv6.org>
Cc: YOSHIFUJI Hideaki <yoshfuji@...ux-ipv6.org>
Signed-off-by: Hannes Frederic Sowa <hannes@...essinduktion.org>
---
 include/net/ipv6.h | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/include/net/ipv6.h b/include/net/ipv6.h
index 851d541..8188d27 100644
--- a/include/net/ipv6.h
+++ b/include/net/ipv6.h
@@ -319,6 +319,18 @@ static inline int ipv6_addr_src_scope(const struct in6_addr *addr)
 	return __ipv6_addr_src_scope(__ipv6_addr_type(addr));
 }
 
+static inline bool __ipv6_addr_needs_scope_id(int type)
+{
+	return type & IPV6_ADDR_LINKLOCAL ||
+	       (type & IPV6_ADDR_MULTICAST &&
+		__ipv6_addr_src_scope(type) <= IPV6_ADDR_SCOPE_LINKLOCAL);
+}
+
+static inline __u32 ipv6_iface_scope_id(const struct in6_addr *addr, int iface)
+{
+	return __ipv6_addr_needs_scope_id(__ipv6_addr_type(addr)) ? iface : 0;
+}
+
 static inline int ipv6_addr_cmp(const struct in6_addr *a1, const struct in6_addr *a2)
 {
 	return memcmp(a1, a2, sizeof(struct in6_addr));
-- 
1.8.1.2

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