When adding a VXLAN tunnel that connects to a VTEP residing in a different IP
network, the tunnel source ip needs to be selected by best fit (longest
matching netmask), based on the destination VTEP ip, and the specific route's
gateway ip.
A bug in ovs-router.c made the source ip to be decided only based on the
destination ip: Thus, if all source ips available to OVS and the destination ip
are in different ip networks - no source ip is selected, and an error is
returned.
This error accorded when using OVS-DPDK and configuring a VXLAN tunnel where
source ip and destination ip are in different networks, and a gateway ip was in
place for the specific route.
The fix tries to match a source ip based on the gateway ip, if no matching
source ip was found based on the destination ip - This way, the gateway becomes
the first hop only if the tunnel crosses between ip networks.
Signed-off-by: Ariel Waizel <ariel.wai...@hpe.com>
diff --git a/lib/ovs-router.c b/lib/ovs-router.c
index e27514a..18d0f8e 100644
--- a/lib/ovs-router.c
+++ b/lib/ovs-router.c
@@ -198,6 +198,9 @@ ovs_router_insert__(uint8_t priority, const struct in6_addr
*ip6_dst,
p->plen = plen;
p->priority = priority;
err = get_src_addr(ip6_dst, output_bridge, &p->src_addr);
+ if (err && ipv6_addr_is_set(gw)) {
+ err = get_src_addr(gw, output_bridge, &p->src_addr);
+ }
if (err) {
free(p);
return err;
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