Date: Wed, 14 Jan 2004 01:29:13 -0800 From: Luigi Rizzo <rizzo@icir.org> To: net@freebsd.org Subject: 'ipv6' type in /etc/protocols ? Message-ID: <20040114012913.A91612@xorpc.icir.org>
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hi, in implementing ipv6 support for ipfw2, i hit the following problem: /etc/protocols has an entry: ipv6 41 IPV6 # ipv6 which is somewhat confusing for the parser -- if you type something like ipfw add allow ipv6 from foo to bar the "ipv6" will match in the call to getprotobyname() and the above will be translated into a rule that matches packets with ip->ip_proto == 41 (6 is TCP, 17 is UDP, etc.), while i presume that what one would really want with the above notation is to match IPv6 packets, i.e. + layer2 packets with mac-type 0x86dd (ipv6) + layer3 packets with ip->ip_v == 6 Now, i can put a special case for the keyword 'ipv6', but I wonder, what do we do with ip->ip_proto == 41 ? Does it make sense to handle this request ? And in this case, what name do we use for it to avoid conflicts ? Looking at /sys/netinet/in.h, it appears that ip_proto == 4 and 41 refer to encapsulations of ipv4 and ipv6 into ip... cheers luigi
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