Date: Wed, 24 Jun 2015 17:13:13 +0200 (CEST) From: Emeric POUPON <emeric.poupon@stormshield.eu> To: freebsd-net@freebsd.org Subject: Re: Multicast routing questions Message-ID: <886014477.4193151.1435158793240.JavaMail.zimbra@stormshield.eu> In-Reply-To: <1192147789.4088965.1435134165130.JavaMail.zimbra@stormshield.eu> References: <1192147789.4088965.1435134165130.JavaMail.zimbra@stormshield.eu>
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Hi, Actually, I don't really understand why imo.imo_multicast_loop is set to 1 in send_packet, ip_mroute.c It seems we don't need to loop the packet once it is mrouted? If the packet is emitted locally, the imo_multicast_loop set by the socket option makes the packet loop back if necessary. Emeric ----- Mail original ----- De: "Emeric POUPON" <emeric.poupon@stormshield.eu> À: freebsd-net@freebsd.org Envoyé: Mercredi 24 Juin 2015 10:22:45 Objet: Multicast routing questions 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 _______________________________________________ freebsd-net@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-net To unsubscribe, send any mail to "freebsd-net-unsubscribe@freebsd.org"
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