get_if_addr for macOS vlan iface not returning correct address

Brief description

get_if_addr(iface="vlan0") returns 0.0.0.0 instead of the IP address.

Scapy version

2.6.1

Python version

3.12.3

Operating system

macOS 15.3.2

Additional environment information

No response

How to reproduce

Expect get_if_hwaddr("vlan0") to return 10.0.2.7, instead we see 0.0.0.0:

vlan_ifaces_list=["vlan1", "vlan0"]
for iface in vlan_ifaces_list:
    print(f"get_if_hwaddr({iface}) \t{get_if_hwaddr(iface)}")
    print(f"get_if_addr({iface}) \t{get_if_addr(iface)}")
>>>
get_if_hwaddr(vlan1) 	00:e0:4c:68:24:00
get_if_addr(vlan1) 	0.0.0.0
get_if_hwaddr(vlan0) 	00:e0:4c:08:1b:1b
get_if_addr(vlan0) 	0.0.0.0

read_routes() has the correct information in columns 3 and 4, but it appears to be drawing from column 2, the gateway entry if I am reading this right.

s = set() # there will be redundencies so we'll use set to remove them
for line in read_routes():
    s.add(line[2:5])
s

>>>
{
 ('0.0.0.0', 'vlan0', '10.0.2.7'),
 ('0.0.0.0', 'vlan1', '10.0.2.11'),
 ('10.0.2.7', 'vlan1', '10.0.2.11'),
snip
}

The IPs are indicated by ifconfig:

vlan1: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> mtu 1500
	options=6063<RXCSUM,TXCSUM,TSO4,TSO6,PARTIAL_CSUM,ZEROINVERT_CSUM>
	ether 00:e0:4c:68:24:00
	inet 10.0.2.11 netmask 0xffff0000 broadcast 10.0.255.255
	nd6 options=201<PERFORMNUD,DAD>
	vlan: 2 parent interface: en7
	media: autoselect (1000baseT <full-duplex>)
	status: active
vlan0: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> mtu 1500
	options=6063<RXCSUM,TXCSUM,TSO4,TSO6,PARTIAL_CSUM,ZEROINVERT_CSUM>
	ether 00:e0:4c:08:1b:1b
	inet 10.0.2.7 netmask 0xffff0000 broadcast 10.0.255.255
	nd6 options=201<PERFORMNUD,DAD>
	vlan: 2 parent interface: en11
	media: autoselect (1000baseT <full-duplex>)
	status: active
snip

Actual result

get_if_addr("vlan1") 	0.0.0.0
get_if_addr("vlan0") 	0.0.0.0

Expected result

get_if_addr("vlan1") 	10.0.2.11
get_if_addr("vlan0") 	10.0.2.7

Related resources

No response

Start with the get_if_addr() and read_routes() entry points, comparing their handling of macOS VLAN interfaces with the supplied ifconfig output. Reproduce the vlan0 and vlan1 cases, then verify that get_if_addr("vlan1") returns 10.0.2.11 and get_if_addr("vlan0") returns 10.0.2.7.