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
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Notes:
svn2git
2020-12-20 02:59:44 +00:00
svn path=/head/; revision=288910
@ -1104,6 +1104,22 @@ ipf_checkv4sum(fin)
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return -1;
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}
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if (m->m_pkthdr.csum_flags & CSUM_DATA_VALID) {
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/* Depending on the driver, UDP may have zero checksum */
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if (fin->fin_p == IPPROTO_UDP && (fin->fin_flx &
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(FI_FRAG|FI_SHORT|FI_BAD)) == 0) {
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udphdr_t *udp = fin->fin_dp;
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if (udp->uh_sum == 0) {
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/*
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* we're good no matter what the hardware
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* checksum flags and csum_data say (handling
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* of csum_data for zero UDP checksum is not
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* consistent across all drivers)
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*/
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fin->fin_cksum = 1;
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return 0;
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}
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}
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if (m->m_pkthdr.csum_flags & CSUM_PSEUDO_HDR)
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sum = m->m_pkthdr.csum_data;
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else
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