introduces the "vrftable" attribute for supporting the End.DT4 and
End.DT6 behaviors in iproute2.
The "vrftable" attribute indicates the routing table associated with
the VRF device used by SRv6 End.DT4/DT6 for routing IPv4/IPv6 packets.
The End.DT4/DT6 is used to implement IPv4/IPv6 L3 VPNs based on Segment
Routing over IPv6 networks in multi-tenants environments.
It decapsulates the received packets and it performs the IPv4/IPv6 routing
lookup in the routing table of the tenant.
The End.DT4/DT6 leverages a VRF device in order to force the routing
lookup into the associated routing table using the "vrftable" attribute.
Some examples:
$ ip -6 route add 2001:db8::1 encap seg6local action End.DT4 vrftable 100 dev
eth0
$ ip -6 route add 2001:db8::2 encap seg6local action End.DT6 vrftable 200 dev
eth0
Standard Output:
$ ip -6 route show 2001:db8::1
2001:db8::1 encap seg6local action End.DT4 vrftable 100 dev eth0 metric 1024
pref medium
JSON Output:
$ ip -6 -j -p route show 2001:db8::2
[ {
"dst": "2001:db8::2",
"encap": "seg6local",
"action": "End.DT6",
"vrftable": 200,
"dev": "eth0",
"metric": 1024,
"flags": [ ],
"pref": "medium"
} ]
Signed-off-by: Paolo Lungaroni <paolo.lungar...@cnit.it>
Signed-off-by: Andrea Mayer <andrea.ma...@uniroma2.it>
---
include/uapi/linux/seg6_local.h | 1 +
ip/iproute_lwtunnel.c | 19 ++++++++++++++++---
2 files changed, 17 insertions(+), 3 deletions(-)
diff --git a/include/uapi/linux/seg6_local.h b/include/uapi/linux/seg6_local.h
index 5312de80..bb5c8ddf 100644
--- a/include/uapi/linux/seg6_local.h
+++ b/include/uapi/linux/seg6_local.h
@@ -26,6 +26,7 @@ enum {
SEG6_LOCAL_IIF,
SEG6_LOCAL_OIF,
SEG6_LOCAL_BPF,
+ SEG6_LOCAL_VRFTABLE,
__SEG6_LOCAL_MAX,
};
#define SEG6_LOCAL_MAX (__SEG6_LOCAL_MAX - 1)
diff --git a/ip/iproute_lwtunnel.c b/ip/iproute_lwtunnel.c
index 9b4f0885..1ab95cd2 100644
--- a/ip/iproute_lwtunnel.c
+++ b/ip/iproute_lwtunnel.c
@@ -294,6 +294,11 @@ static void print_encap_seg6local(FILE *fp, struct rtattr
*encap)
rtnl_rttable_n2a(rta_getattr_u32(tb[SEG6_LOCAL_TABLE]),
b1, sizeof(b1)));
+ if (tb[SEG6_LOCAL_VRFTABLE])
+ print_string(PRINT_ANY, "vrftable", "vrftable %s ",
+
rtnl_rttable_n2a(rta_getattr_u32(tb[SEG6_LOCAL_VRFTABLE]),
+ b1, sizeof(b1)));
+
if (tb[SEG6_LOCAL_NH4]) {
print_string(PRINT_ANY, "nh4",
"nh4 %s ", rt_addr_n2a_rta(AF_INET,
tb[SEG6_LOCAL_NH4]));
@@ -860,9 +865,10 @@ static int lwt_parse_bpf(struct rtattr *rta, size_t len,
static int parse_encap_seg6local(struct rtattr *rta, size_t len, int *argcp,
char ***argvp)
{
- int segs_ok = 0, hmac_ok = 0, table_ok = 0, nh4_ok = 0, nh6_ok = 0;
- int iif_ok = 0, oif_ok = 0, action_ok = 0, srh_ok = 0, bpf_ok = 0;
- __u32 action = 0, table, iif, oif;
+ int segs_ok = 0, hmac_ok = 0, table_ok = 0, vrftable_ok = 0;
+ int nh4_ok = 0, nh6_ok = 0, iif_ok = 0, oif_ok = 0;
+ __u32 action = 0, table, vrftable, iif, oif;
+ int action_ok = 0, srh_ok = 0, bpf_ok = 0;
struct ipv6_sr_hdr *srh;
char **argv = *argvp;
int argc = *argcp;
@@ -887,6 +893,13 @@ static int parse_encap_seg6local(struct rtattr *rta,
size_t len, int *argcp,
duparg2("table", *argv);
rtnl_rttable_a2n(&table, *argv);
ret = rta_addattr32(rta, len, SEG6_LOCAL_TABLE, table);
+ } else if (strcmp(*argv, "vrftable") == 0) {
+ NEXT_ARG();
+ if (vrftable_ok++)
+ duparg2("vrftable", *argv);
+ rtnl_rttable_a2n(&vrftable, *argv);
+ ret = rta_addattr32(rta, len, SEG6_LOCAL_VRFTABLE,
+ vrftable);
} else if (strcmp(*argv, "nh4") == 0) {
NEXT_ARG();
if (nh4_ok++)
--
2.20.1
