Previously, when a packet was sent from a raw packet socket, the packet
buffer's link header was left unpopulated and the link header was only
found in the packet buffer's payload. This breaks the expectations of
LinkEndpoints which expect the link layer header to always be populated
when the link requires a header.
PiperOrigin-RevId: 542349445
In preparation for improving ARP handling of gratuitous ARPs, set PktType in
regular inbound flow instead of only when handling packet sockets.
PiperOrigin-RevId: 501562322
The packetsocket link endpoint is used to enable a packet endpoint to
receive packets right before they are sent to the driver for outgoing
packets or right after they are recieved from the driver for incoming
packets.
Before this change, only packets that are sent/received by the
`stack.nic` were delivered to packet endpoints. However, the packet
endpoint should also receive packets that don't reach `stack.nic`.
Such an example can be when the interface is bridged and an incoming
packet is sent out through a sibling bridge port instead of being
delivered to a `stack.nic`.
The packetsocket link endpoint must wrap a link endpoint that
populates the link headers for ingress packets. It should ideally
be placed as low in the link endpoint heirarchy as possible so that
packets are probed as close to device drivers as possible.
https://github.com/google/gvisor/commit/2d9b33c0fd7d812a7296cd71f14c03925f815f28
removed the original packetsocket link endpoint which only allowed
low-level capturing of outbound packets but not inbound packets.
The CL mentioned above is cl/395761629.
PiperOrigin-RevId: 424947620
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