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[lwip-devel] [bug #52937] raw_input() must tell ip4/6_input() whether th

From: hanhui
Subject: [lwip-devel] [bug #52937] raw_input() must tell ip4/6_input() whether this protocol has been received
Date: Sun, 21 Jan 2018 07:17:00 -0500 (EST)
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Follow-up Comment #4, bug #52937 (project lwip):

Linux implementation is similar, all ip input packet will first enter the raw
input function, if raw input matched, then return "delivered", then ip input
function according to the packet protocol number (for example: udp, tcp ...)
calls the relevant protocol input function, if packet protocol is not found in
the protocol table, the ip input function checks to see if the raw input
returned "delivered", and if not, the ICMP_DEST_UNREACH packet will be send.

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