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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>
This commit is contained in:
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 Normal file
View file

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/* fou.h - FOU Interface */
#ifndef _UAPI_LINUX_FOU_H
#define _UAPI_LINUX_FOU_H
/* NETLINK_GENERIC related info
*/
#define FOU_GENL_NAME "fou"
#define FOU_GENL_VERSION 0x1
enum {
FOU_ATTR_UNSPEC,
FOU_ATTR_PORT, /* u16 */
FOU_ATTR_AF, /* u8 */
FOU_ATTR_IPPROTO, /* u8 */
__FOU_ATTR_MAX,
};
#define FOU_ATTR_MAX (__FOU_ATTR_MAX - 1)
enum {
FOU_CMD_UNSPEC,
FOU_CMD_ADD,
FOU_CMD_DEL,
__FOU_CMD_MAX,
};
#define FOU_CMD_MAX (__FOU_CMD_MAX - 1)
#endif /* _UAPI_LINUX_FOU_H */