ipv6: take care of disable_policy when restoring routes

When routes corresponding to addresses are restored by
fixup_permanent_addr(), the dst_nopolicy parameter was not set.
The typical use case is a user that configures an address on a down
interface and then put this interface up.

Let's take care of this flag in addrconf_f6i_alloc(), so that every callers
benefit ont it.

CC: stable@kernel.org
CC: David Forster <dforster@brocade.com>
Fixes: df789fe75206 ("ipv6: Provide ipv6 version of "disable_policy" sysctl")
Reported-by: Siwar Zitouni <siwar.zitouni@6wind.com>
Signed-off-by: Nicolas Dichtel <nicolas.dichtel@6wind.com>
Reviewed-by: David Ahern <dsahern@kernel.org>
Link: https://lore.kernel.org/r/20220623120015.32640-1-nicolas.dichtel@6wind.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

diff --git a/net/ipv6/addrconf.c b/net/ipv6/addrconf.c
index 1b19325..5864cbc 100644 (file)
--- a/net/ipv6/addrconf.c
+++ b/net/ipv6/addrconf.c
@@ -1109,10 +1109,6 @@ ipv6_add_addr(struct inet6_dev *idev, struct ifa6_config *cfg,
                goto out;
        }
 
-       if (net->ipv6.devconf_all->disable_policy ||
-           idev->cnf.disable_policy)
-               f6i->dst_nopolicy = true;
-
        neigh_parms_data_state_setall(idev->nd_parms);
 
        ifa->addr = *cfg->pfx;

diff --git a/net/ipv6/route.c b/net/ipv6/route.c
index d25dc83..8283557 100644 (file)
--- a/net/ipv6/route.c
+++ b/net/ipv6/route.c
@@ -4569,8 +4569,15 @@ struct fib6_info *addrconf_f6i_alloc(struct net *net,
        }
 
        f6i = ip6_route_info_create(&cfg, gfp_flags, NULL);
-       if (!IS_ERR(f6i))
+       if (!IS_ERR(f6i)) {
                f6i->dst_nocount = true;
+
+               if (!anycast &&
+                   (net->ipv6.devconf_all->disable_policy ||
+                    idev->cnf.disable_policy))
+                       f6i->dst_nopolicy = true;
+       }
+
        return f6i;
 }