Look-up a key in the hash table. Returns NULL if not found

Should be called each time the UDP socket is drained

Should be called when an ICMP message is received that should tear down the connection. Returns 1 if the UDP payload (delivered in the ICMP packet) w

Should be called when an ICMP Type 3, Code 4 packet (fragmentation needed) is received, to adjust the MTU Returns 1 if the UDP payload (delivered in

Returns 1 if the UDP payload was recognized as a UTP packet, or 0 if it was not

Write bytes to the UTP socket. Returns the number of bytes written. 0 indicates the socket is no longer writable, -1 indicates an error

Test if we're ready to decay max_window XXX this breaks when spaced by > INT_MAX/2, which is 49 days; the failure mode in that case is we do an extra

#define addrfmt(x, s) x.fmt(s, sizeof(s))

Item contains the element we want to make space for index is the index in the list.

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If we can, decay max window, returns true if we actually did so