From: Hangbin Liu liuhangbin@gmail.com
[ Upstream commit 617940123e0140521f3080d2befc2bf55bcda094 ]
When we modify the route metric, the peer address's route need also be updated. Before the fix:
+ ip addr add dev dummy1 2001:db8::1 peer 2001:db8::2 metric 60 + ip -6 route show dev dummy1 2001:db8::1 proto kernel metric 60 pref medium 2001:db8::2 proto kernel metric 60 pref medium + ip addr change dev dummy1 2001:db8::1 peer 2001:db8::2 metric 61 + ip -6 route show dev dummy1 2001:db8::1 proto kernel metric 61 pref medium 2001:db8::2 proto kernel metric 60 pref medium
After the fix: + ip addr change dev dummy1 2001:db8::1 peer 2001:db8::2 metric 61 + ip -6 route show dev dummy1 2001:db8::1 proto kernel metric 61 pref medium 2001:db8::2 proto kernel metric 61 pref medium
Fixes: 8308f3ff1753 ("net/ipv6: Add support for specifying metric of connected routes") Signed-off-by: Hangbin Liu liuhangbin@gmail.com Reviewed-by: David Ahern dsahern@gmail.com Signed-off-by: David S. Miller davem@davemloft.net Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org Signed-off-by: Yang Yingliang yangyingliang@huawei.com --- net/ipv6/addrconf.c | 19 +++++++++++++++---- 1 file changed, 15 insertions(+), 4 deletions(-)
diff --git a/net/ipv6/addrconf.c b/net/ipv6/addrconf.c index b2d83de..e76efa5 100644 --- a/net/ipv6/addrconf.c +++ b/net/ipv6/addrconf.c @@ -4535,12 +4535,13 @@ static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local, }
static int modify_prefix_route(struct inet6_ifaddr *ifp, - unsigned long expires, u32 flags) + unsigned long expires, u32 flags, + bool modify_peer) { struct fib6_info *f6i; u32 prio;
- f6i = addrconf_get_prefix_route(&ifp->addr, + f6i = addrconf_get_prefix_route(modify_peer ? &ifp->peer_addr : &ifp->addr, ifp->prefix_len, ifp->idev->dev, 0, RTF_GATEWAY | RTF_DEFAULT); @@ -4553,7 +4554,8 @@ static int modify_prefix_route(struct inet6_ifaddr *ifp, ip6_del_rt(dev_net(ifp->idev->dev), f6i);
/* add new one */ - addrconf_prefix_route(&ifp->addr, ifp->prefix_len, + addrconf_prefix_route(modify_peer ? &ifp->peer_addr : &ifp->addr, + ifp->prefix_len, ifp->rt_priority, ifp->idev->dev, expires, flags, GFP_KERNEL); } else { @@ -4629,7 +4631,7 @@ static int inet6_addr_modify(struct inet6_ifaddr *ifp, struct ifa6_config *cfg) int rc = -ENOENT;
if (had_prefixroute) - rc = modify_prefix_route(ifp, expires, flags); + rc = modify_prefix_route(ifp, expires, flags, false);
/* prefix route could have been deleted; if so restore it */ if (rc == -ENOENT) { @@ -4637,6 +4639,15 @@ static int inet6_addr_modify(struct inet6_ifaddr *ifp, struct ifa6_config *cfg) ifp->rt_priority, ifp->idev->dev, expires, flags, GFP_KERNEL); } + + if (had_prefixroute && !ipv6_addr_any(&ifp->peer_addr)) + rc = modify_prefix_route(ifp, expires, flags, true); + + if (rc == -ENOENT && !ipv6_addr_any(&ifp->peer_addr)) { + addrconf_prefix_route(&ifp->peer_addr, ifp->prefix_len, + ifp->rt_priority, ifp->idev->dev, + expires, flags, GFP_KERNEL); + } } else if (had_prefixroute) { enum cleanup_prefix_rt_t action; unsigned long rt_expires;