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[IPV6]: Fix address deletion

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If you add more than one IPv6 address belonging to the same prefix and 
delete the address that was last added, routing table entry for that 
prefix is also deleted.
Tested on 2.6.14.4

To reproduce:
ip addr add 3ffe::1/64 dev eth0
ip addr add 3ffe::2/64 dev eth0
/* wait DAD */
sleep 1
ip addr del 3ffe::2/64 dev eth0
ip -6 route

(route to 3ffe::/64 should be gone)

In ipv6_del_addr(), if ifa == ifp, we set ifa->if_next to NULL, and later 
assign ifap = &ifa->if_next, effectively terminating the for-loop.
This prevents us from checking if there are other addresses using the same 
prefix that are valid, and thus resulting in deletion of the prefix.
This applies only if the first entry in idev->addr_list is the address to 
be deleted.

Signed-off-by: Kristian Slavov <kristian.slavov@nomadiclab.com>
Acked-by: YOSHIFUJI Hideaki <yoshfuji@linux-ipv6.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Kristian Slavov 2005-12-21 18:47:24 -08:00 committed by David S. Miller
parent 7eb1b3d372
commit 1d1428045c
1 changed files with 3 additions and 2 deletions
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5
net/ipv6/addrconf.c
View file

@ -634,8 +634,7 @@ static void ipv6_del_addr(struct inet6_ifaddr *ifp)
}
#endif
for (ifap = &idev->addr_list; (ifa=*ifap) != NULL;
ifap = &ifa->if_next) {
for (ifap = &idev->addr_list; (ifa=*ifap) != NULL;) {
if (ifa == ifp) {
*ifap = ifa->if_next;
__in6_ifa_put(ifp);
@ -643,6 +642,7 @@ static void ipv6_del_addr(struct inet6_ifaddr *ifp)
if (!(ifp->flags & IFA_F_PERMANENT) || onlink > 0)
break;
deleted = 1;
continue;
} else if (ifp->flags & IFA_F_PERMANENT) {
if (ipv6_prefix_equal(&ifa->addr, &ifp->addr,
ifp->prefix_len)) {
@ -666,6 +666,7 @@ static void ipv6_del_addr(struct inet6_ifaddr *ifp)
}
}
}
ifap = &ifa->if_next;
}
write_unlock_bh(&idev->lock);