On 5/3/17 4:02 PM, Cong Wang wrote: > On Wed, May 3, 2017 at 11:22 AM, David Ahern <dsah...@gmail.com> wrote: >> On 5/3/17 11:02 AM, Cong Wang wrote: >>> A quick glance shows we need to simply check local->rt6i_idev >>> since we do the same check for sprt right above. >> >> As I recall, rt6i_idev is set for all routes except null_entry and it is >> not set on null_entry only because of initialization order. > > Are you sure? > > if (event == NETDEV_REGISTER && (dev->flags & IFF_LOOPBACK)) { > net->ipv6.ip6_null_entry->dst.dev = dev; > net->ipv6.ip6_null_entry->rt6i_idev = in6_dev_get(dev); > #ifdef CONFIG_IPV6_MULTIPLE_TABLES > net->ipv6.ip6_prohibit_entry->dst.dev = dev; > net->ipv6.ip6_prohibit_entry->rt6i_idev = in6_dev_get(dev); > net->ipv6.ip6_blk_hole_entry->dst.dev = dev; > net->ipv6.ip6_blk_hole_entry->rt6i_idev = in6_dev_get(dev); > #endif > } > > Loopback is the first one to register, so null entry is set to > loopback dev initially. Similar for init_net. >
Why don't you add a printk and see ;-)