[PATCH 0/3] Kill rt->rt_dst usage in options processing.

Ok, this kills the rest of the rt->rt_dst uses in IP options
handling.

The main obstacle was ip_rt_get_source().  Solved simply by passing
the SKB in so that we can fetch the keys from there if needed.

After that the rest became trivial.

All real uses of rt->rt_dst are now entirely limited to route.c

Signed-off-by: David S. Miller <davem@davemloft.net>