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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>
This commit is contained in:
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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2
net/ipv4/tcp_input.c
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@ -6204,7 +6204,7 @@ int tcp_conn_request(struct request_sock_ops *rsk_ops,
tcp_openreq_init(req, &tmp_opt, skb, sk);
/* Note: tcp_v6_init_req() might override ir_iif for link locals */
inet_rsk(req)->ir_iif = sk->sk_bound_dev_if;
inet_rsk(req)->ir_iif = inet_request_bound_dev_if(sk, skb);
af_ops->init_req(req, sk, skb);