fib6_node_lookup
struct fib6_node *fib6_node_lookup(struct fib6_node *root,
fn = fib6_node_lookup(sn, NULL, saddr);
fn = fib6_node_lookup(&table->tb6_root, &fl6->daddr, &fl6->saddr);
fn = fib6_node_lookup(&table->tb6_root, &fl6->daddr, &fl6->saddr);
fn = fib6_node_lookup(&table->tb6_root, &fl6->daddr, &fl6->saddr);