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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