Date: Thu, 20 Feb 2014 21:02:00 +0000 (UTC) From: "Andrey V. Elsukov" <ae@FreeBSD.org> To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-stable@freebsd.org, svn-src-stable-10@freebsd.org Subject: svn commit: r262256 - stable/10/sys/netinet6 Message-ID: <201402202102.s1KL20r0053381@svn.freebsd.org>
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Author: ae Date: Thu Feb 20 21:01:59 2014 New Revision: 262256 URL: http://svnweb.freebsd.org/changeset/base/262256 Log: MFC r261835: Drop packets to multicast address whose scop field contains the reserved value 0. Sponsored by: Yandex LLC Modified: stable/10/sys/netinet6/ip6_input.c Directory Properties: stable/10/ (props changed) Modified: stable/10/sys/netinet6/ip6_input.c ============================================================================== --- stable/10/sys/netinet6/ip6_input.c Thu Feb 20 20:53:29 2014 (r262255) +++ stable/10/sys/netinet6/ip6_input.c Thu Feb 20 21:01:59 2014 (r262256) @@ -571,7 +571,18 @@ ip6_input(struct mbuf *m) in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr); goto bad; } - + if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst) && + IPV6_ADDR_MC_SCOPE(&ip6->ip6_dst) == 0) { + /* + * RFC4291 2.7: + * Nodes must not originate a packet to a multicast address + * whose scop field contains the reserved value 0; if such + * a packet is received, it must be silently dropped. + */ + IP6STAT_INC(ip6s_badscope); + in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr); + goto bad; + } #ifdef ALTQ if (altq_input != NULL && (*altq_input)(m, AF_INET6) == 0) { /* packet is dropped by traffic conditioner */
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