Date: Thu, 26 Nov 2015 09:25:21 +0000 (UTC) From: Michael Tuexen <tuexen@FreeBSD.org> To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-head@freebsd.org Subject: svn commit: r291364 - head/sys/netinet Message-ID: <201511260925.tAQ9PLSf043343@repo.freebsd.org>
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Author: tuexen Date: Thu Nov 26 09:25:20 2015 New Revision: 291364 URL: https://svnweb.freebsd.org/changeset/base/291364 Log: When receiving an SCTP/UDP packet and the interface performed the UDP checksum computation and signals that it was OK, clear this bit when passing the packet to SCTP. Since the bits indicating a valid UDP checksum and a valid SCTP checksum are the same, the SCTP stack would assume that also an SCTP checksum check has been performed. MFC after: 1 week Modified: head/sys/netinet/sctputil.c Modified: head/sys/netinet/sctputil.c ============================================================================== --- head/sys/netinet/sctputil.c Thu Nov 26 08:58:13 2015 (r291363) +++ head/sys/netinet/sctputil.c Thu Nov 26 09:25:20 2015 (r291364) @@ -6957,6 +6957,18 @@ sctp_recv_udp_tunneled_packet(struct mbu for (last = m; last->m_next; last = last->m_next); last->m_next = sp; m->m_pkthdr.len += sp->m_pkthdr.len; + /* + * The CSUM_DATA_VALID flags indicates that the HW checked the UDP + * checksum and it was valid. Since CSUM_DATA_VALID == + * CSUM_SCTP_VALID this would imply that the HW also verified the + * SCTP checksum. Therefore, clear the bit. + */ + SCTPDBG(SCTP_DEBUG_CRCOFFLOAD, + "sctp_recv_udp_tunneled_packet(): Packet of length %d received on %s with csum_flags 0x%b.\n", + m->m_pkthdr.len, + if_name(m->m_pkthdr.rcvif), + (int)m->m_pkthdr.csum_flags, CSUM_BITS); + m->m_pkthdr.csum_flags &= ~CSUM_DATA_VALID; iph = mtod(m, struct ip *); switch (iph->ip_v) { #ifdef INET
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