@@ -35,6 +35,8 @@ enum {
SEG6_IPTUN_MODE_INLINE,
SEG6_IPTUN_MODE_ENCAP,
SEG6_IPTUN_MODE_L2ENCAP,
+ SEG6_IPTUN_MODE_ENCAP_RED,
+ SEG6_IPTUN_MODE_L2ENCAP_RED,
};
#endif
@@ -105,7 +105,7 @@ static void usage(void)
"ENCAPTYPE := [ mpls | ip | ip6 | seg6 | seg6local | rpl | ioam6 ]\n"
"ENCAPHDR := [ MPLSLABEL | SEG6HDR | SEG6LOCAL | IOAM6HDR ]\n"
"SEG6HDR := [ mode SEGMODE ] segs ADDR1,ADDRi,ADDRn [hmac HMACKEYID] [cleanup]\n"
- "SEGMODE := [ encap | inline ]\n"
+ "SEGMODE := [ encap | encap.red | inline | l2encap | l2encap.red ]\n"
"SEG6LOCAL := action ACTION [ OPTIONS ] [ count ]\n"
"ACTION := { End | End.X | End.T | End.DX2 | End.DX6 | End.DX4 |\n"
" End.DT6 | End.DT4 | End.DT46 | End.B6 | End.B6.Encaps |\n"
@@ -135,6 +135,8 @@ static const char *seg6_mode_types[] = {
[SEG6_IPTUN_MODE_INLINE] = "inline",
[SEG6_IPTUN_MODE_ENCAP] = "encap",
[SEG6_IPTUN_MODE_L2ENCAP] = "l2encap",
+ [SEG6_IPTUN_MODE_ENCAP_RED] = "encap.red",
+ [SEG6_IPTUN_MODE_L2ENCAP_RED] = "l2encap.red",
};
static const char *format_seg6mode_type(int mode)
@@ -229,7 +229,7 @@ throw " | " unreachable " | " prohibit " | " blackhole " | " nat " ]"
.IR ENCAP_SEG6 " := "
.B seg6
.BR mode " [ "
-.BR encap " | " inline " | " l2encap " ] "
+.BR encap " | " encap.red " | " inline " | " l2encap " | " l2encap.red " ] "
.B segs
.IR SEGMENTS " [ "
.B hmac
@@ -807,10 +807,22 @@ is a set of encapsulation attributes specific to the
- Encapsulate packet in an outer IPv6 header with SRH
.sp
+.B mode encap.red
+- Encapsulate packet in an outer IPv6 header with SRH applying the
+reduced segment list. When there is only one segment and the HMAC is
+not present, the SRH is omitted.
+.sp
+
.B mode l2encap
- Encapsulate ingress L2 frame within an outer IPv6 header and SRH
.sp
+.B mode l2encap.red
+- Encapsulate ingress L2 frame within an outer IPv6 header and SRH
+applying the reduced segment list. When there is only one segment
+and the HMAC is not present, the SRH is omitted.
+.sp
+
.I SEGMENTS
- List of comma-separated IPv6 addresses
.sp
This patch adds the support for the reduced version of the H.Encaps and H.L2Encaps behaviors as defined in RFC 8986 [1]. H.Encaps.Red and H.L2Encaps.Red SRv6 behaviors are an optimization of the H.Encaps and H.L2Encaps aiming to reduce the length of the SID List carried in the pushed SRH. Specifically, the reduced version of the behaviors removes the first SID contained in the SID List (i.e. SRv6 Policy) by storing it into the IPv6 Destination Address. When SRv6 Policy is made of only one SID, the reduced version of the behaviors omits the SRH at all and pushes that SID directly into the IPv6 DA. Some examples: ip -6 route add 2001:db8::1 encap seg6 mode encap.red segs fcf0:1::e,fcf0:2::d6 dev eth0 ip -6 route add 2001:db8::2 encap seg6 mode l2encap.red segs fcf0:1::d2 dev eth0 Standard Output: ip -6 route show 2001:db8::1 2001:db8::1 encap seg6 mode encap.red segs 2 [ fcf0:1::e fcf0:2::d6 ] dev eth0 metric 1024 pref medium JSON Output: ip -6 -j -p route show 2001:db8::1 [ { "dst": "2001:db8::1", "encap": "seg6", "mode": "encap.red", "segs": [ "fcf0:1::e","fcf0:2::d6" ], "dev": "eth0", "metric": 1024, "flags": [ ], "pref": "medium" } ] [1] - https://datatracker.ietf.org/doc/html/rfc8986 Signed-off-by: Paolo Lungaroni <paolo.lungaroni@uniroma2.it> --- include/uapi/linux/seg6_iptunnel.h | 2 ++ ip/iproute.c | 2 +- ip/iproute_lwtunnel.c | 2 ++ man/man8/ip-route.8.in | 14 +++++++++++++- 4 files changed, 18 insertions(+), 2 deletions(-)