DEV9: Support NdisMediumIP/DLT_RAW adapters with pcap #11997
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Description of Changes
Support adapters with a capture data type of
DLT_RAW.Handle point-point links with the internal DHCP.
Rationale behind Changes
Some VPN software, like Cloudflare's WARP, uses
NdisMediumIPadapters (which npcap maps toDLT_RAW) which, as its name might suggest, handles IP packets directly, instead of Ethernet frames.These VPN adapters may also present a point-point link (having a netmask of 255.255.255.255)
PS2's networking doesn't expect such networks, instead requiring a gateway IP present within the same network.
As a workaround, we set the gateway to the PS2's IP, fudging this requirement.
Suggested Testing Steps
Test pcap on VPN adapters, such as Cloudflare's WARP or ProtonVPN.
ProtonVPN might not use the point-point netmask, so is worthwhile testing both