getifaddrs listed only the host's IPv4 and IPv6 addresses, so the
per-interface AF_LINK entries FreeBSD's getifaddrs puts first were
missing, and with them the interface index, hardware address, MTU and
counters and every interface without an address.
On Linux each interface now starts with an AF_LINK entry, followed by
its addresses, as FreeBSD 11.4's getifaddrs orders them. Its address is
a sockaddr_dl with the host index, type, name and hardware address
(none for a loopback), sized as FreeBSD's if_attach sizes it. Its
ifa_data is a 152-byte FreeBSD if_data filled as if_data_copy fills it:
type, address and header length, link state, MTU, speed and the host's
packet, byte, error, drop and multicast counters from sysfs, or the
host list's 32-bit counters when sysfs cannot be read. Fields with no
host equivalent are 0 and listed in the debt entry. Windows is
unchanged.
FreeBSD's freeifaddrs is a plain free of the list, and Doom 3 BFG
(PPSA99313) releases the list with free. The list came from host malloc,
so the guest free stopped on an unregistered allocation; it now comes
from the application heap, and freeifaddrs returns it there.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Drop IFF_POINTOPOINT from an address without a peer and compute an IPv4 broadcast address the host omits from the netmask, since FreeBSD always provides the address when the flag is set. Check zero port, flowinfo and padding in the test.
Return -1 with the FreeBSD errno for a null list and for expected host and allocation failures, as getcwd does. On Windows, give an unspecified prefix length a host mask, leave PPP and tunnel adapters without broadcast or point-to-point flags since their peer address is not reported, fall back to if<index> for long NDIS names, and bound the adapter query retries. Compare every entry with the host's own list in the test.
List the host's IPv4 and IPv6 addresses in FreeBSD's struct ifaddrs layout, with FreeBSD sockaddrs and interface flags, from getifaddrs on Linux and GetAdaptersAddresses on Windows. The list is one allocation, so freeifaddrs is a single free.
Federico Marras