Date: Wed, 3 Sep 2014 06:39:53 -0700 From: Craig Rodrigues <rodrigc@freebsd.org> To: "Andrey V. Elsukov" <ae@freebsd.org> Cc: freebsd-net@freebsd.org, bugzilla-noreply@freebsd.org Subject: Re: [Bug 193246] Bug in IPv6 multicast join(), uncovered by Jenkins Message-ID: <CAG=rPVe05jnxrD8QDkvwThBhKz7GCECRKTjK=XenAhbKwUB%2BPw@mail.gmail.com> In-Reply-To: <54070758.2050405@FreeBSD.org> References: <bug-193246-2472@https.bugs.freebsd.org/bugzilla/> <bug-193246-2472-qfPNXiTWms@https.bugs.freebsd.org/bugzilla/> <54070758.2050405@FreeBSD.org>
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On Wed, Sep 3, 2014 at 5:19 AM, Andrey V. Elsukov <ae@freebsd.org> wrote: > On 03.09.2014 14:05, bugzilla-noreply@freebsd.org wrote: > > Hi, > > you said that this code works in linux. I looked in the linux kernel > source, and I think it should return EINVAL too. > net/ipv6/mcast.c:ipv6_sock_mc_join: > > 154 if (!ipv6_addr_is_multicast(addr)) > 155 return -EINVAL; The code does work in Linux. However, you need to look at the JDK source, not the Linux kernel source. In this file: http://hg.openjdk.java.net/jdk7/jdk7/jdk/file/9b8c96f96a0f/src/solaris/native/java/net/PlainDatagramSocketImpl.c in the mcast_join_leave() function, there are two code paths: (1) Linux, (2) Solaris. It looks like on Solaris, they support IPv4-mapped multicast addresses for IPV6, and things work when they create an IPv6 socket, and then put an IPv4-mapped multicast address in it. For Linux, they have specific code paths in that function which seem to force creating an IPv4 socket. -- Craig
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