openstack/os-ken
Code Issues Proposed changes

bfdlib: follow TTL/hop limit in RFC5881 explicitly.

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Signed-off-by: Wei-Li Tang <alextwl@xinguard.com>
Signed-off-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>
This commit is contained in:
Wei-Li Tang 2014-10-10 16:48:36 +08:00 committed by FUJITA Tomonori
parent 49aa2ff9ae
commit 5aa14c61a1
1 changed files with 7 additions and 2 deletions
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9
ryu/lib/bfdlib.py
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@ -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)