Date: Tue, 6 Oct 2015 03:41:12 +0000 (UTC) From: Cy Schubert <cy@FreeBSD.org> To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-head@freebsd.org Subject: svn commit: r288910 - head/sys/contrib/ipfilter/netinet Message-ID: <201510060341.t963fChJ061378@repo.freebsd.org>
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Author: cy Date: Tue Oct 6 03:41:11 2015 New Revision: 288910 URL: https://svnweb.freebsd.org/changeset/base/288910 Log: On some interfaces, ipfilter drops UDP packets with zero checkum. This commit fixes that. PR: 166372 Submitted by: mk@neon1.net Reviewed by: Darren Reed <darrenr@reed.wattle.id.au> MFC after: 1 week Modified: head/sys/contrib/ipfilter/netinet/ip_fil_freebsd.c Modified: head/sys/contrib/ipfilter/netinet/ip_fil_freebsd.c ============================================================================== --- head/sys/contrib/ipfilter/netinet/ip_fil_freebsd.c Tue Oct 6 01:24:46 2015 (r288909) +++ head/sys/contrib/ipfilter/netinet/ip_fil_freebsd.c Tue Oct 6 03:41:11 2015 (r288910) @@ -1104,6 +1104,22 @@ ipf_checkv4sum(fin) return -1; } if (m->m_pkthdr.csum_flags & CSUM_DATA_VALID) { + /* Depending on the driver, UDP may have zero checksum */ + if (fin->fin_p == IPPROTO_UDP && (fin->fin_flx & + (FI_FRAG|FI_SHORT|FI_BAD)) == 0) { + udphdr_t *udp = fin->fin_dp; + if (udp->uh_sum == 0) { + /* + * we're good no matter what the hardware + * checksum flags and csum_data say (handling + * of csum_data for zero UDP checksum is not + * consistent across all drivers) + */ + fin->fin_cksum = 1; + return 0; + } + } + if (m->m_pkthdr.csum_flags & CSUM_PSEUDO_HDR) sum = m->m_pkthdr.csum_data; else
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