Hi,
The commit (29ba5fed1bbd09c2cba890798c8f9eaab251401d) causes
another regression:
Prior to the commit, on a freshly booted system, when I do:
sysctl net.ipv6.conf.all.disable_ipv6=1
Then any attempt to connect to ::1 will fail immediately with
"Network is unreachable" (e.g. "ping6 ::1" or "telnet ::1 22".
After the commit, doing
sysctl net.ipv6.conf.all.disable_ipv6=1
makes connection attempts to ::1 wait for a long time before they fail.
This is caused by the local route which is now left configured.
"ip -6 r l table all" has an additional line in its output:
local ::1 via :: dev lo table local proto none metric 0 mtu 16436
rtt 40ms rttvar 40ms cwnd 3 advmss 16376 hoplimit 0
With both ::1 and 127.0.0.1 specified for localhost in
/etc/hosts, disabling ipv6 now breaks many applications
connecting to localhost. Deleting the local route manually solves
the problems.
Could this be reverted, please?
I have the feeling that Eric's patch is the safest solution we
have so far:
> Finding the real bug is beyond me right now, but fixing the regression
> in disable_ipv6 is simple. We can just delete ::1 when we bring down
> the loopback interface, and it will be restored automatically when we
> bring the loopback interface back up.
>
> Signed-off-by: "Eric W. Biederman" <[email protected]>
> ---
> Index: linux-2.6.37-rc5.x86_64/net/ipv6/addrconf.c
> ===================================================================
> --- linux-2.6.37-rc5.x86_64.orig/net/ipv6/addrconf.c
> +++ linux-2.6.37-rc5.x86_64/net/ipv6/addrconf.c
> @@ -2727,6 +2727,7 @@ static int addrconf_ifdown(struct net_de
> /* If just doing link down, and address is permanent
> and not link-local, then retain it. */
> if (!how &&
> + !ipv6_addr_loopback(&ifa->addr) &&
> (ifa->flags&IFA_F_PERMANENT) &&
> !(ipv6_addr_type(&ifa->addr) & IPV6_ADDR_LINKLOCAL)) {
> list_move_tail(&ifa->if_list, &keep_list);
--
Jiri Bohac <[email protected]>
SUSE Labs, SUSE CZ
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