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Date:	Fri, 04 Sep 2009 21:38:07 -0400
From:	Brian Haley <>
To:	david Miller <>
CC:	"" <>,
	YOSHIFUJI Hideaki <>
Subject: [PATCH] ipv6: Add IFA_F_DADFAILED flag

[Note: if this is accepted I'll send out a patch for iproute,
 if you'd prefer to not use the last ifa_flag I'll send a
 much larger patch that does this differently :) ]

Add IFA_F_DADFAILED flag to denote an IPv6 address that has
failed Duplicate Address Detection, that way tools like
/sbin/ip can be more informative.

3: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qlen 1000
    inet6 2001:db8::1/64 scope global tentative dadfailed 
       valid_lft forever preferred_lft forever

Signed-off-by: Brian Haley <>

diff --git a/include/linux/if_addr.h b/include/linux/if_addr.h
index a60c821..fd97404 100644
--- a/include/linux/if_addr.h
+++ b/include/linux/if_addr.h
@@ -41,6 +41,7 @@ enum
 #define	IFA_F_NODAD		0x02
 #define IFA_F_OPTIMISTIC	0x04
+#define IFA_F_DADFAILED		0x08
 #define	IFA_F_HOMEADDRESS	0x10
 #define IFA_F_DEPRECATED	0x20
 #define IFA_F_TENTATIVE		0x40
diff --git a/net/ipv6/addrconf.c b/net/ipv6/addrconf.c
index 43b3c9f..6532966 100644
--- a/net/ipv6/addrconf.c
+++ b/net/ipv6/addrconf.c
@@ -1376,7 +1376,7 @@ static void addrconf_dad_stop(struct inet6_ifaddr *ifp)
 	if (ifp->flags&IFA_F_PERMANENT) {
-		ifp->flags |= IFA_F_TENTATIVE;
+		ifp->flags |= IFA_F_DADFAILED;
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