Date: Wed, 24 Jun 2015 10:22:45 +0200 (CEST) From: Emeric POUPON <emeric.poupon@stormshield.eu> To: freebsd-net@freebsd.org Subject: Multicast routing questions Message-ID: <1192147789.4088965.1435134165130.JavaMail.zimbra@stormshield.eu> In-Reply-To: <1675689431.4082440.1435132697610.JavaMail.zimbra@stormshield.eu>
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Hello, I'm testing multicast routing on FreeBSD 9.3 and I have a question: In packet reception, it seems the packet is received locally as many times the packet is rerouted + 1: ip_input -> ip_mforward -> ip_output (as many times there are dst interfaces in the route cache entry) -> ip_mloopback -> if_simloop (rcvif becomes the ifp of the output interface) -> ip_input -> ip_mforward -> ... In ip_input, after each ip_mforward call, the packet is processed locally (using the goto "ours:") Futhermore it seems this infinite loop is actually broken thanks to a test in ip_mforward that checks the ifp is the same as the registered one in the cache entry. Maybe I missed something, but it does not seem to be working as expected. What do you think? Emeric
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