Reinitialize IP header length after checksum calculation. It is used · opnsense/src@6b6b693 · GitHub

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Reinitialize IP header length after checksum calculation. It is used

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later by TCP-MD5 code.

This fixes the problem with broken TCP-MD5 over IPv4 when NIC has
disabled TCP checksum offloading.

PR:		223835
MFC after:	1 week

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bu7cher authored and fichtner committed Feb 11, 2018

1 parent 5a1bbae commit 6b6b693

sys/netinet/tcp_input.c

-Original file line number
+Diff line change
@@ Expand Up / @@ -707,6 +707,7 @@ tcp_input(struct mbuf **mp, int *offp, int proto) @@
     			ip->ip_tos = iptos;
     			/* Re-initialization for later version check */
     			ip->ip_v = IPVERSION;
+    			ip->ip_hl = off0 >> 2;
     		}
     		if (th->th_sum) {
@@ Expand Down @@

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