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bgp: add code to handle RD 0:0 at the head of nexthop network address in MP_REACH_NLRI path attribute

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The second is patch to add or skip RD 0:0 label for the next_hop address in MP_REACH_NLRI attribute.

According to RFC, next_hop address seems to be required to contain RD of 0 when advertise VPN prefix.
This is defined in RFC 4659(3.2.1.1.  BGP Speaker Requesting IPv6 Transport) for VPN-IPv6
and in RFC 4364(4.3.2.  Route Distribution Among PEs by BGP) for VPN-IPv4.

Signed-off-by: Hiroshi Yokoi <yokoi.hiroshi@po.ntts.co.jp>
Signed-off-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>
This commit is contained in:
Hiroshi Yokoi 2014-07-31 14:59:49 +09:00 committed by FUJITA Tomonori
parent cc3c00b663
commit 7acda14a5d
1 changed files with 22 additions and 3 deletions
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25
ryu/lib/packet/bgp.py
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@ -1771,6 +1771,7 @@ class BGPPathAttributeMpReachNLRI(_PathAttribute):
_VALUE_PACK_STR = '!HBB' # afi, safi, next hop len
_ATTR_FLAGS = BGP_ATTR_FLAG_OPTIONAL
_class_prefixes = ['_BinAddrPrefix']
_rd_length = 8
def __init__(self, afi, safi, next_hop, nlri,
next_hop_len=0, reserved='\0',
@ -1806,8 +1807,16 @@ class BGPPathAttributeMpReachNLRI(_PathAttribute):
while binnlri:
n, binnlri = addr_cls.parser(binnlri)
nlri.append(n)
if RouteFamily(afi, safi) in (RF_IPv6_UC, RF_IPv6_VPN):
rf = RouteFamily(afi, safi)
if rf == RF_IPv6_UC:
next_hop = addrconv.ipv6.bin_to_text(next_hop_bin)
elif rf == RF_IPv6_VPN:
next_hop = addrconv.ipv6.bin_to_text(next_hop_bin[cls._rd_length:])
next_hop_len -= cls._rd_length
elif rf == RF_IPv4_VPN:
next_hop = addrconv.ipv4.bin_to_text(next_hop_bin[cls._rd_length:])
next_hop_len -= cls._rd_length
else:
next_hop = addrconv.ipv4.bin_to_text(next_hop_bin)
return {
@ -1822,12 +1831,22 @@ class BGPPathAttributeMpReachNLRI(_PathAttribute):
def serialize_value(self):
# fixup
self.next_hop_len = len(self._next_hop_bin)
if RouteFamily(self.afi, self.safi) in (RF_IPv4_VPN, RF_IPv6_VPN):
empty_label_stack = '\x00' * self._rd_length
next_hop_len = len(self._next_hop_bin) + len(empty_label_stack)
next_hop_bin = empty_label_stack
next_hop_bin += self._next_hop_bin
else:
next_hop_len = self.next_hop_len
next_hop_bin = self._next_hop_bin
self.reserved = '\0'
buf = bytearray()
msg_pack_into(self._VALUE_PACK_STR, buf, 0, self.afi,
self.safi, self.next_hop_len)
buf += self._next_hop_bin
self.safi, next_hop_len)
buf += next_hop_bin
buf += self.reserved
binnlri = bytearray()
for n in self.nlri: