@@ -64,6 +64,8 @@ enum {
SEG6_LOCAL_ACTION_END_AM = 14,
/* custom BPF action */
SEG6_LOCAL_ACTION_END_BPF = 15,
+ /* decap and lookup of DA in v4 or v6 table */
+ SEG6_LOCAL_ACTION_END_DT46 = 16,
__SEG6_LOCAL_ACTION_MAX,
};
@@ -107,8 +107,8 @@ static void usage(void)
"SEGMODE := [ encap | inline ]\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.B6 | End.B6.Encaps | End.BM |\n"
- " End.S | End.AS | End.AM | End.BPF }\n"
+ " End.DT6 | End.DT4 | End.DT46 | End.B6 | End.B6.Encaps |\n"
+ " End.BM | End.S | End.AS | End.AM | End.BPF }\n"
"OPTIONS := OPTION [ OPTIONS ]\n"
"OPTION := { srh SEG6HDR | nh4 ADDR | nh6 ADDR | iif DEV | oif DEV |\n"
" table TABLEID | vrftable TABLEID | endpoint PROGNAME }\n"
@@ -220,6 +220,7 @@ static const char *seg6_action_names[SEG6_LOCAL_ACTION_MAX + 1] = {
[SEG6_LOCAL_ACTION_END_AS] = "End.AS",
[SEG6_LOCAL_ACTION_END_AM] = "End.AM",
[SEG6_LOCAL_ACTION_END_BPF] = "End.BPF",
+ [SEG6_LOCAL_ACTION_END_DT46] = "End.DT46",
};
static const char *format_action_type(int action)
@@ -834,6 +834,49 @@ rules. This action only accepts packets with either a zero Segments
Left value or no SRH at all, and an inner IPv6 packet. Other
matching packets are dropped.
+.BR End.DT6 " { " table " | " vrftable " } "
+.I TABLEID
+- Decapsulate the inner IPv6 packet and forward it according to the
+specified lookup table.
+.I TABLEID
+is either a number or a string from the file
+.BR "@SYSCONFDIR@/rt_tables" .
+If
+.B vrftable
+is used, the argument must be a VRF device associated with
+the table id. Moreover, the VRF table associated with the
+table id must be configured with the VRF strict mode turned
+on (net.vrf.strict_mode=1). This action only accepts packets
+with either a zero Segments Left value or no SRH at all,
+and an inner IPv6 packet. Other matching packets are dropped.
+
+.B End.DT4 vrftable
+.I TABLEID
+- Decapsulate the inner IPv4 packet and forward it according to the
+specified lookup table.
+.I TABLEID
+is either a number or a string from the file
+.BR "@SYSCONFDIR@/rt_tables" .
+The argument must be a VRF device associated with the table id.
+Moreover, the VRF table associated with the table id must be configured
+with the VRF strict mode turned on (net.vrf.strict_mode=1). This action
+only accepts packets with either a zero Segments Left value or no SRH
+at all, and an inner IPv4 packet. Other matching packets are dropped.
+
+.B End.DT46 vrftable
+.I TABLEID
+- Decapsulate the inner IPv4 or IPv6 packet and forward it according
+to the specified lookup table.
+.I TABLEID
+is either a number or a string from the file
+.BR "@SYSCONFDIR@/rt_tables" .
+The argument must be a VRF device associated with the table id.
+Moreover, the VRF table associated with the table id must be configured
+with the VRF strict mode turned on (net.vrf.strict_mode=1). This action
+only accepts packets with either a zero Segments Left value or no SRH
+at all, and an inner IPv4 or IPv6 packet. Other matching packets are
+dropped.
+
.B End.B6 srh segs
.IR SEGMENTS " [ "
.B hmac
@@ -1172,6 +1215,11 @@ ip -6 route add 2001:db8:1::/64 encap seg6 mode encap segs 2001:db8:42::1,2001:d
Adds an IPv6 route with SRv6 encapsulation and two segments attached.
.RE
.PP
+ip -6 route add 2001:db8:1::/64 encap seg6local action End.DT46 vrftable 100 dev vrf100
+.RS 4
+Adds an IPv6 route with SRv6 decapsulation and forward with lookup in VRF table.
+.RE
+.PP
ip route add 10.1.1.0/30 nhid 10
.RS 4
Adds an ipv4 route using nexthop object with id 10.
We introduce the new "End.DT46" action for supporting the SRv6 End.DT46 Behavior in iproute2. The SRv6 End.DT46 Behavior, defined in RFC 8986 [1] section 4.8, can be used to implement L3 VPNs based on Segment Routing over IPv6 networks in multi-tenants environments and it is capable of handling both IPv4 and IPv6 tenant traffic at the same time. The SRv6 End.DT46 Behavior decapsulates the received packets and it performs the IPv4 or IPv6 routing lookup in the routing table of the tenant. As for the End.DT4 and for the End.DT6 in VRF mode, the SRv6 End.DT46 Behavior leverages a VRF device in order to force the routing lookup into the associated routing table using the "vrftable" attribute. To make the End.DT46 work properly, it must be guaranteed that the routing table used for routing lookup operations is bound to one and only one VRF during the tunnel creation. Such constraint has to be enforced by enabling the VRF strict_mode sysctl parameter, i.e.: $ sysctl -wq net.vrf.strict_mode=1 Note that the same approach is used for the End.DT4 Behavior and for the End.DT6 Behavior in VRF mode. An SRv6 End.DT46 Behavior instance can be created as follows: $ ip -6 route add 2001:db8::1 encap seg6local action End.DT46 vrftable 100 dev vrf100 Standard Output: $ ip -6 route show 2001:db8::1 2001:db8::1 encap seg6local action End.DT46 vrftable 100 dev vrf100 metric 1024 pref medium JSON Output: $ ip -6 -j -p route show 2001:db8::1 [ { "dst": "2001:db8::1", "encap": "seg6local", "action": "End.DT46", "vrftable": 100, "dev": "vrf100", "metric": 1024, "flags": [ ], "pref": "medium" } ] This patch updates the route.8 man page and the ip route help with the information related to End.DT46. Considering that the same information was missing for the SRv6 End.DT4 and the End.DT6 Behaviors, we have also added it. [1] https://www.rfc-editor.org/rfc/rfc8986.html#name-enddt46-decapsulation-and-s Signed-off-by: Andrea Mayer <andrea.mayer@uniroma2.it> Signed-off-by: Paolo Lungaroni <paolo.lungaroni@uniroma2.it> --- include/uapi/linux/seg6_local.h | 2 ++ ip/iproute.c | 4 +-- ip/iproute_lwtunnel.c | 1 + man/man8/ip-route.8.in | 48 +++++++++++++++++++++++++++++++++ 4 files changed, 53 insertions(+), 2 deletions(-)