fou: Support for foo-over-udp RX path

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This patch provides a receive path for foo-over-udp. This allows
direct encapsulation of IP protocols over UDP. The bound destination
port is used to map to an IP protocol, and the XFRM framework
(udp_encap_rcv) is used to receive encapsulated packets. Upon
reception, the encapsulation header is logically removed (pointer
to transport header is advanced) and the packet is reinjected into
the receive path with the IP protocol indicated by the mapping.

Netlink is used to configure FOU ports. The configuration information
includes the port number to bind to and the IP protocol corresponding
to that port.

This should support GRE/UDP
(http://tools.ietf.org/html/draft-yong-tsvwg-gre-in-udp-encap-02),
as will as the other IP tunneling protocols (IPIP, SIT).

Signed-off-by: Tom Herbert <therbert@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

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Tom Herbert 2014-09-17 12:25:56 -07:00 • committed by David S. Miller

parent ce3e02867e

commit 23461551c0

4 changed files with 322 additions and 0 deletions

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32

include/uapi/linux/fou.h

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10

net/ipv4/Kconfig

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1

net/ipv4/Makefile

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279

net/ipv4/fou.c

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