From 07294ffd83191093fc1086ff9d1949666be57971 Mon Sep 17 00:00:00 2001 From: Christian Breunig Date: Fri, 29 Dec 2023 13:29:02 +0100 Subject: vyos.template: T5869: first_host_address() does not honor RFC4291 section 2.6.1 The subnet router anycast address is predefined. Its format is as follows: | n bits | 128-n bits | +------------------------------------------------+----------------+ | subnet prefix | 00000000000000 | +------------------------------------------------+----------------+ The "subnet prefix" in an anycast address is the prefix that identifies a specific link. This anycast address is syntactically the same as a unicast address for an interface on the link with the interface identifier set to zero. Packets sent to the Subnet-Router anycast address will be delivered to one router on the subnet. All routers are required to support the Subnet-Router anycast addresses for the subnets to which they have interfaces. The Subnet-Router anycast address is intended to be used for applications where a node needs to communicate with any one of the set of routers. Our code as of now returns the subnet router anycast address as the first_host_address(). (cherry picked from commit cc4ce81ece57faca8ce111b8f3748389ecb40202) --- python/vyos/template.py | 11 +++-------- 1 file changed, 3 insertions(+), 8 deletions(-) (limited to 'python') diff --git a/python/vyos/template.py b/python/vyos/template.py index 216f967a7..119ea54d6 100644 --- a/python/vyos/template.py +++ b/python/vyos/template.py @@ -316,20 +316,15 @@ def is_ipv6(text): except: return False @register_filter('first_host_address') -def first_host_address(text): +def first_host_address(prefix): """ Return first usable (host) IP address from given prefix. Example: - 10.0.0.0/24 -> 10.0.0.1 - 2001:db8::/64 -> 2001:db8:: """ from ipaddress import ip_interface - from ipaddress import IPv4Network - from ipaddress import IPv6Network - - addr = ip_interface(text) - if addr.version == 4: - return str(addr.ip +1) - return str(addr.ip) + tmp = ip_interface(prefix).network + return str(tmp.network_address +1) @register_filter('last_host_address') def last_host_address(text): -- cgit v1.2.3