Close closes the PPPoE session.

Write writes a packet to the PPPoE session.

SetReadDeadline sets the deadline for future Read operations.

encodeDiscoveryPacket marshals a PPPoE Discovery packet into raw bytes.

parseDiscoveryPacket parses a PPPoE Discovery packet into a discoveryPacket.

CheckPrivilegeForContainerTests returns nil if Docker and raw socket based tests can be run.

New runs PPPoE discovery on the given interface, and creates a Conn that can send PPP frames on the resulting PPPoE session.

Read reads a packet from the PPPoE session.

StartServer runs a PPP+PPPoE server in a Docker container. It returns a closer function (which should be defer-ed), or an error if server startup fail

newDiscoveryConn creates a net.PacketConn that can receive PPPoE discovery packets.

Stolen from /usr/include/linux/if_pppox.h

parsePADO parses a raw PADO packet and extracts the PPPoE cookie.

pppoeDiscovery executes PPPoE discovery and returns a PPPoE session ID.

readPADO waits to receive a valid PPPoE Active Discovery Offer (PADO) packet, and returns relevant information from it.

sendPADI broadcasts a PADI packet. While trivial, it's separated out so tests can invoke it.

LocalAddr returns the local address of the PPPoE connection. PPPoE Conns don't have an interesting local address to share, so this returns nil for now

RemoteAddr returns the address of the connected PPPoE concentrator, as an *Addr.

SetDeadline sets both the read and write deadlines for future Read and Write operations.

SetWriteDeadline sets the deadline for future Write operations.