net: Allow accepted sockets to be bound to l3mdev domain

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Allow accepted sockets to derive their sk_bound_dev_if setting from the
l3mdev domain in which the packets originated. A sysctl setting is added
to control the behavior which is similar to sk_mark and
sysctl_tcp_fwmark_accept.

This effectively allow a process to have a "VRF-global" listen socket,
with child sockets bound to the VRF device in which the packet originated.
A similar behavior can be achieved using sk_mark, but a solution using marks
is incomplete as it does not handle duplicate addresses in different L3
domains/VRFs. Allowing sockets to inherit the sk_bound_dev_if from l3mdev
domain provides a complete solution.

Signed-off-by: David Ahern <dsa@cumulusnetworks.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

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David Ahern 2015-12-16 13:20:44 -08:00 • committed by David S. Miller

parent 1a8524794f

commit 6dd9a14e92

8 changed files with 42 additions and 5 deletions

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14

include/net/inet_sock.h

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3

include/net/netns/ipv4.h

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