At Fri, 01 May 2009 18:33:50 +0100, Bruce Simpson <b...@incunabulum.net> wrote:
> During the MLDv2 refactoring, I removed some old KAME code which > supports the ability to listen to *all* multicast groups. > It isn't clear to me whether this code was still in use, and I couldn't > find information about it in the normative RFCs (2292, 3542) for IPv6 > stack implementation. > > This call needed super-user privileges to use, and I'm not sure if > anything is actually using it. Can anyone out there with possible > exposure to it clarify? I believe you can safely remove it. The KAME repository version of that code was already deprecated long time ago. See the change for rev.1.433 at: http://orange.kame.net/dev/cvsweb2.cgi/kame/kame/sys/netinet6/ip6_output.c I also noted this strange behavior in a book about the KAME implementation: 3684: mreq = mtod(m, struct ipv6_mreq *); 3685: if (IN6_IS_ADDR_UNSPECIFIED(&mreq->ipv6mr_multiaddr)) { 3686: /* 3687: * We use the unspecified address to specify to accept 3688: * all multicast addresses. Only super user is allowed 3689: * to do this. 3690: */ 3692: if (suser(p)) 3696: { 3697: error = EACCES; 3698: break; 3699: } 3684–3699 ipv6mr_multiaddr field must hold a valid IPv6 multicast address. The KAME implementation allows a privileged application to specify the IPv6 unspecified address. While the intention may be to allow the socket to accept packets from any multicast address, the system does not actually behave that way. First, the IN6_LOOKUP_MULTI() macro does not have a special matching rule for the unspecified address. Secondly, in order to accept any multicast addresses on an interface, it is necessary to specify the promiscuous mode for the interface’s multicast filter, which will not actually be done in this case. Later versions of the KAME implementation removed this code and similar code that exists for IPV6_LEAVE_GROUP. Hope this helps, --- JINMEI, Tatuya Internet Systems Consortium, Inc. _______________________________________________ freebsd-net@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-net To unsubscribe, send any mail to "freebsd-net-unsubscr...@freebsd.org"
