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This allows a privileged process to filter by socket mark when dumping sockets via INET_DIAG_BY_FAMILY. This is useful on systems that use mark-based routing such as Android. The ability to filter socket marks requires CAP_NET_ADMIN, which is consistent with other privileged operations allowed by the SOCK_DIAG interface such as the ability to destroy sockets and the ability to inspect BPF filters attached to packet sockets. [cherry-pick of a52e95abf772b43c9226e9a72d3c1353903ba96f] Change-Id: I8b90b814264d9808bda050cdba8f104943bdb9a8 Tested: https://android-review.googlesource.com/261350 Signed-off-by: Lorenzo Colitti <lorenzo@google.com> Acked-by: David Ahern <dsa@cumulusnetworks.com> Signed-off-by: David S. Miller <davem@davemloft.net>