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ipv6: Add IFA_F_DADFAILED flag 

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 <brian.haley@hp.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Brian Haley 2009-09-09 14:41:32 +00:00 committed by David S. Miller
parent 384912ed19
commit cc411d0bae
2 changed files with 8 additions and 5 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

1
include/linux/if_addr.h
View File

@ -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

12
net/ipv6/addrconf.c
View File

@ -1371,12 +1371,14 @@ struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, const struct in6_addr *add
/* Gets referenced address, destroys ifaddr */
static void addrconf_dad_stop(struct inet6_ifaddr *ifp)
static void addrconf_dad_stop(struct inet6_ifaddr *ifp, int dad_failed)
{
if (ifp->flags&IFA_F_PERMANENT) {
spin_lock_bh(&ifp->lock);
addrconf_del_timer(ifp);
ifp->flags |= IFA_F_TENTATIVE;
if (dad_failed)
ifp->flags |= IFA_F_DADFAILED;
spin_unlock_bh(&ifp->lock);
in6_ifa_put(ifp);
#ifdef CONFIG_IPV6_PRIVACY
@ -1422,7 +1424,7 @@ void addrconf_dad_failure(struct inet6_ifaddr *ifp)
}
}
addrconf_dad_stop(ifp);
addrconf_dad_stop(ifp, 1);
}
/* Join to solicited addr multicast group. */
@ -2778,7 +2780,7 @@ static void addrconf_dad_start(struct inet6_ifaddr *ifp, u32 flags)
idev->cnf.accept_dad < 1 ||
!(ifp->flags&IFA_F_TENTATIVE) ||
ifp->flags & IFA_F_NODAD) {
ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC);
ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
spin_unlock_bh(&ifp->lock);
read_unlock_bh(&idev->lock);
@ -2795,7 +2797,7 @@ static void addrconf_dad_start(struct inet6_ifaddr *ifp, u32 flags)
* - otherwise, kill it.
*/
in6_ifa_hold(ifp);
addrconf_dad_stop(ifp);
addrconf_dad_stop(ifp, 0);
return;
}
@ -2829,7 +2831,7 @@ static void addrconf_dad_timer(unsigned long data)
* DAD was successful
*/
ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC);
ifp->flags &= ~(IFA_F_TENTATIVE|IFA_F_OPTIMISTIC|IFA_F_DADFAILED);
spin_unlock_bh(&ifp->lock);
read_unlock_bh(&idev->lock);