Signed-off-by: Wei-Li Tang <[email protected]>
---
ryu/lib/bfdlib.py | 9 +++++++--
1 file changed, 7 insertions(+), 2 deletions(-)
diff --git a/ryu/lib/bfdlib.py b/ryu/lib/bfdlib.py
index 21bfd6f..465ea9a 100644
--- a/ryu/lib/bfdlib.py
+++ b/ryu/lib/bfdlib.py
@@ -535,9 +535,10 @@ class BFDPacket(object):
pkt.add_protocol(eth_pkt)
# IPv4 encapsulation
- # ToS sets to 192 (Network control/CS6)
+ # set ToS to 192 (Network control/CS6)
+ # set TTL to 255 (RFC5881 Section 5.)
ipv4_pkt = ipv4.ipv4(proto=inet.IPPROTO_UDP, src=src_ip, dst=dst_ip,
- tos=192, identification=ipv4_id)
+ tos=192, identification=ipv4_id, ttl=255)
pkt.add_protocol(ipv4_pkt)
# UDP encapsulation
@@ -861,6 +862,10 @@ class BFDLib(app_manager.RyuApp):
ip_pkt = pkt.get_protocols(ipv4.ipv4)[0]
+ # Discard it if TTL != 255 for single hop bfd. (RFC5881 Section 5.)
+ if ip_pkt.ttl != 255:
+ return
+
# Parse BFD packet here.
bfd_pkt = BFDPacket.bfd_parse(data)
--
1.7.9.5
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