From e7c7faa936680a2f0e78fc6d9683a5728421a150 Mon Sep 17 00:00:00 2001 From: David Ahern Date: Thu, 28 Jun 2018 13:36:55 -0700 Subject: [PATCH] net/ipv6: Fix updates to prefix route Sowmini reported that a recent commit broke prefix routes for linklocal addresses. The newly added modify_prefix_route is attempting to add a new prefix route when the ifp priority does not match the route metric however the check needs to account for the default priority. In addition, the route add fails because the route already exists, and then the delete removes the one that exists. Flip the order to do the delete first. Fixes: 8308f3ff1753 ("net/ipv6: Add support for specifying metric of connected routes") Reported-by: Sowmini Varadhan Tested-by: Sowmini Varadhan Signed-off-by: David Ahern Signed-off-by: David S. Miller --- net/ipv6/addrconf.c | 9 ++++++--- 1 file changed, 6 insertions(+), 3 deletions(-) diff --git a/net/ipv6/addrconf.c b/net/ipv6/addrconf.c index c134286d6a41..91580c62bb86 100644 --- a/net/ipv6/addrconf.c +++ b/net/ipv6/addrconf.c @@ -4528,6 +4528,7 @@ static int modify_prefix_route(struct inet6_ifaddr *ifp, unsigned long expires, u32 flags) { struct fib6_info *f6i; + u32 prio; f6i = addrconf_get_prefix_route(&ifp->addr, ifp->prefix_len, @@ -4536,13 +4537,15 @@ static int modify_prefix_route(struct inet6_ifaddr *ifp, if (!f6i) return -ENOENT; - if (f6i->fib6_metric != ifp->rt_priority) { + prio = ifp->rt_priority ? : IP6_RT_PRIO_ADDRCONF; + if (f6i->fib6_metric != prio) { + /* delete old one */ + ip6_del_rt(dev_net(ifp->idev->dev), f6i); + /* add new one */ addrconf_prefix_route(&ifp->addr, ifp->prefix_len, ifp->rt_priority, ifp->idev->dev, expires, flags, GFP_KERNEL); - /* delete old one */ - ip6_del_rt(dev_net(ifp->idev->dev), f6i); } else { if (!expires) fib6_clean_expires(f6i); -- GitLab