-static u_int32_t tcpmss_reverse_mtu6(const struct ipv6hdr *iph)
-{
- struct flowi fl = {
- .fl6_dst = iph->saddr,
- };
- const struct nf_afinfo *ai;
- struct rtable *rt = NULL;
- u_int32_t mtu = ~0U;
-
- rcu_read_lock();
- ai = nf_get_afinfo(AF_INET6);
- if (ai != NULL)
- ai->route((struct dst_entry **)&rt, &fl);
- rcu_read_unlock();
-
- if (rt != NULL) {
- mtu = dst_mtu(&rt->u.dst);
- dst_release(&rt->u.dst);
- }
- return mtu;
-}
-