ipv6: prepare rt6_mtu_change() for exception table
If we move all cached dst into the exception table under the main route, current rt6_mtu_change() will no longer be able to access them. This commit makes rt6_mtu_change_route() function to also go through all cached routes in the exception table under the main route and do proper updates on the mtu. This is a preparation in order to move all cached routes into the exception table. Signed-off-by: Wei Wang <weiwan@google.com> Signed-off-by: Martin KaFai Lau <kafai@fb.com> Signed-off-by: Eric Dumazet <edumazet@google.com> Signed-off-by: David S. Miller <davem@davemloft.net>
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