Author: tuexen
Date: Sun May 31 12:11:05 2015
New Revision: 283819
URL: https://svnweb.freebsd.org/changeset/base/283819
Log:
A TCP checksum of 0 is completely valid. Mapping 0 to 0xffff only
applies to UDP and UDP-Lite.
MFC after: 3 days
Modified:
head/contrib/traceroute/traceroute.c
Modified: head/contrib/traceroute/traceroute.c
==============================================================================
--- head/contrib/traceroute/traceroute.c Sun May 31 12:04:06 2015
(r283818)
+++ head/contrib/traceroute/traceroute.c Sun May 31 12:11:05 2015
(r283819)
@@ -1470,10 +1470,8 @@ tcp_prep(struct outdata *outdata)
tcp->th_flags = TH_SYN;
tcp->th_sum = 0;
- if (doipcksum) {
- u_short sum = p_cksum(outip, (u_short*)tcp, protlen, protlen);
- tcp->th_sum = (sum) ? sum : 0xffff;
- }
+ if (doipcksum)
+ tcp->th_sum = p_cksum(outip, (u_short*)tcp, protlen, protlen);
}
int
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