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[202012] Advertise ipv6 link local address #1811

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Merged
prsunny merged 2 commits into from
Sep 15, 2021
Merged

[202012] Advertise ipv6 link local address #1811

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c44d717
advertise ipv6 link local address
sumukhatv Sep 9, 2021
c56007f
Refactor neighbor_advertiser script
sumukhatv Sep 9, 2021
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23 changes: 23 additions & 0 deletions scripts/neighbor_advertiser
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Original file line number Diff line number Diff line change
Expand Up @@ -11,6 +11,7 @@ import argparse
import json
import os
import requests
import subprocess
import sys
import time
import traceback
Expand Down Expand Up @@ -227,6 +228,22 @@ def get_vlan_addr_prefix(vlan_intf_name, ip_ver):

return vlan_addr, vlan_prefix

def get_link_local_addr(vlan_interface):
try:
out = subprocess.check_output(['ip', '-6', 'addr', 'show', vlan_interface])
out = out.decode('UTF-8')
for line in out.splitlines():
keys = line.split()
if keys[0] == 'inet6':
ip = IPNetwork(keys[1])
if str(ip.ip).startswith("fe80"):
# Link local ipv6 address
return str(ip.ip)
except Exception:
log.log_error('failed to get %s addresses from o.s.' % vlan_interface)

return None


def get_vlan_addresses(vlan_interface):
vlan_id = get_vlan_interface_vlan_id(vlan_interface)
Expand All @@ -236,6 +253,12 @@ def get_vlan_addresses(vlan_interface):
ipv4_addr, ipv4_prefix = get_vlan_addr_prefix(vlan_interface, 4)
ipv6_addr, ipv6_prefix = get_vlan_addr_prefix(vlan_interface, 6)

if len(ipv6_addr):
link_local_addr = get_link_local_addr(vlan_interface)
if link_local_addr and link_local_addr not in ipv6_addr:
ipv6_addr.append(link_local_addr)
ipv6_prefix.append('128')

metadata = config_db.get_table('DEVICE_METADATA')
mac_addr = metadata['localhost']['mac']
if not mac_addr:
Expand Down