Date: Wed, 03 Sep 2014 10:05:53 +0000 From: bugzilla-noreply@freebsd.org To: freebsd-net@FreeBSD.org Subject: [Bug 193246] Bug in IPv6 multicast join(), uncovered by Jenkins Message-ID: <bug-193246-2472-qfPNXiTWms@https.bugs.freebsd.org/bugzilla/> In-Reply-To: <bug-193246-2472@https.bugs.freebsd.org/bugzilla/> References: <bug-193246-2472@https.bugs.freebsd.org/bugzilla/>
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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=193246 --- Comment #4 from Craig Rodrigues <rodrigc@FreeBSD.org> --- I tracked this down some more. Inside the JDK, there is this code in http://hg.openjdk.java.net/jdk7/jdk7/jdk/file/9b8c96f96a0f/src/solaris/native/java/net/PlainDatagramSocketImpl.c =============================================================================== /* * IPv6 join. If it's an IPv4 multicast group then we use an IPv4-mapped * address. */ #ifdef AF_INET6 { struct ipv6_mreq mname6; jbyteArray ipaddress; jbyte caddr[16]; jint family; jint address; family = (*env)->GetIntField(env, iaObj, ia_familyID) == IPv4? AF_INET : AF_INET6; if (family == AF_INET) { /* will convert to IPv4-mapped address */ memset((char *) caddr, 0, 16); address = (*env)->GetIntField(env, iaObj, ia_addressID); caddr[10] = 0xff; caddr[11] = 0xff; caddr[12] = ((address >> 24) & 0xff); caddr[13] = ((address >> 16) & 0xff); caddr[14] = ((address >> 8) & 0xff); caddr[15] = (address & 0xff); =============================================================================== I can confirm that the address created by this code looks something like: 0 0 0 0 0 0 0 0 0 0 ff ff ef 4d 7c d5 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 In FreeBSD, in src/sys/netinet6/in6_mcast.c inside in6p_join_group(), there is this: if (!IN6_IS_ADDR_MULTICAST(&gsa->sin6.sin6_addr)) return (EINVAL); Since IN6_IS_ADDR_MULTICAST() only checks if the first octet is 0xff, that is what is returning the EINVAL. So the JDK is creating an IPV4 multicast address mapped inside an IPV6 address. The FreeBSD kernel code is rejecting this as a valid IPV6 multicast address. I'm not sure if it is better to fix this in the kernel or the JDK. -- You are receiving this mail because: You are on the CC list for the bug. You are the assignee for the bug.
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