netdev - [PATCH RFC 1/2] ipv6: introdcue __ipv6_addr_needs_scope_id and ipv6_iface_scope

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Date:	Mon, 11 Feb 2013 12:13:03 +0100
From:	Hannes Frederic Sowa <hannes@...essinduktion.org>
To:	YOSHIFUJI Hideaki <yoshfuji@...ux-ipv6.org>,
	Erik Hugne <erik.hugne@...csson.com>, netdev@...r.kernel.org
Subject: [PATCH RFC 1/2] ipv6: introdcue __ipv6_addr_needs_scope_id and ipv6_iface_scope_id helper functions

This strictly a RFC only (I also left out my signed-off). This patch
introduces helper functions to set and check for the need of scope ids.

Suggested-by: YOSHIFUJI Hideaki <yoshfuji@...ux-ipv6.org>
Cc: YOSHIFUJI Hideaki <yoshfuji@...ux-ipv6.org>
---
 include/net/ipv6.h | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/include/net/ipv6.h b/include/net/ipv6.h
index 851d541..1f61dc9 100644
--- a/include/net/ipv6.h
+++ b/include/net/ipv6.h
@@ -319,6 +319,19 @@ 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_ANY &&
+	       !(type & IPV6_ADDR_LOOPBACK && type & IPV6_ADDR_UNICAST) &&
+	       __ipv6_addr_src_scope(type) <= IPV6_ADDR_SCOPE_LINKLOCAL;
+}
+
+static inline __u32 ipv6_iface_scope_id(const struct in6_addr *addr,
+					unsigned 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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