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ipv6, token: allow for clearing the current device token 

The original tokenized iid support implemented via f53adae4ea ("net: ipv6:
add tokenized interface identifier support") didn't allow for clearing a
device token as it was intended that this addressing mode was the only one
active for globally scoped IPv6 addresses. Later we relaxed that restriction
via 617fe29d45 ("net: ipv6: only invalidate previously tokenized addresses"),
and we should also allow for clearing tokens as there's no good reason why
it shouldn't be allowed.

Fixes: 617fe29d45 ("net: ipv6: only invalidate previously tokenized addresses")
Reported-by: Robin H. Johnson <robbat2@gentoo.org>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Cc: Hannes Frederic Sowa <hannes@stressinduktion.org>
Acked-by: Hannes Frederic Sowa <hannes@stressinduktion.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Daniel Borkmann 2016-04-08 15:55:00 +02:00 committed by David S. Miller
parent fafc4e1ea1
commit 47e27d5e92
1 changed files with 6 additions and 4 deletions
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10
net/ipv6/addrconf.c
View File

@ -4995,15 +4995,13 @@ static int inet6_set_iftoken(struct inet6_dev *idev, struct in6_addr *token)
{
struct inet6_ifaddr *ifp;
struct net_device *dev = idev->dev;
bool update_rs = false;
bool clear_token, update_rs = false;
struct in6_addr ll_addr;
ASSERT_RTNL();
if (!token)
return -EINVAL;
if (ipv6_addr_any(token))
return -EINVAL;
if (dev->flags & (IFF_LOOPBACK | IFF_NOARP))
return -EINVAL;
if (!ipv6_accept_ra(idev))
@ -5018,10 +5016,13 @@ static int inet6_set_iftoken(struct inet6_dev *idev, struct in6_addr *token)
write_unlock_bh(&idev->lock);
clear_token = ipv6_addr_any(token);
if (clear_token)
goto update_lft;
if (!idev->dead && (idev->if_flags & IF_READY) &&
!ipv6_get_lladdr(dev, &ll_addr, IFA_F_TENTATIVE |
IFA_F_OPTIMISTIC)) {
/* If we're not ready, then normal ifup will take care
* of this. Otherwise, we need to request our rs here.
*/
@ -5029,6 +5030,7 @@ static int inet6_set_iftoken(struct inet6_dev *idev, struct in6_addr *token)
update_rs = true;
}
update_lft:
write_lock_bh(&idev->lock);
if (update_rs) {