seg6: add support for SRv6 H.Encaps.Red behavior

[ Upstream commit b07c8cdbe9 ]

The SRv6 H.Encaps.Red behavior described in [1] is an optimization of
the SRv6 H.Encaps behavior [2].

H.Encaps.Red reduces the length of the SRH by excluding the first
segment (SID) in the SRH of the pushed IPv6 header. The first SID is
only placed in the IPv6 Destination Address field of the pushed IPv6
header.
When the SRv6 Policy only contains one SID the SRH is omitted, unless
there is an HMAC TLV to be carried.

[1] - https://datatracker.ietf.org/doc/html/rfc8986#section-5.2
[2] - https://datatracker.ietf.org/doc/html/rfc8986#section-5.1

Signed-off-by: Andrea Mayer <andrea.mayer@uniroma2.it>
Signed-off-by: Anton Makarov <anton.makarov11235@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Stable-dep-of: c64a0727f9 ("net: ipv6: fix dst ref loop on input in seg6 lwt")
Signed-off-by: Sasha Levin <sashal@kernel.org>

This commit is contained in:

Andrea Mayer

2022-07-27 20:54:05 +02:00

committed by

Greg Kroah-Hartman

parent bf5801cc24

commit 86df97f030

2 changed files with 128 additions and 1 deletions

									
										include/uapi/linux/seg6_iptunnel.h
									
		+1
		
												View File
												
				@@ -35,6 +35,7 @@ enum {

					SEG6_IPTUN_MODE_INLINE,

					SEG6_IPTUN_MODE_ENCAP,

					SEG6_IPTUN_MODE_L2ENCAP,

					SEG6_IPTUN_MODE_ENCAP_RED,

				};

				#endif