Changeset 56960 in vbox for trunk

Timestamp:

Jul 16, 2015 11:30:18 PM (9 years ago)

Author:

vboxsync

Message:

NAT: adjust IP checksum after decrementing TTL so that if we use this
IP header in a future ICMP error the checksum is correct.

File:

• trunk/src/VBox/Devices/Network/slirp/ip_input.c (modified) (1 diff)

trunk/src/VBox/Devices/Network/slirp/ip_input.c

@@ -194 +194 @@
 
     ip->ip_ttl--;
+    if (ip->ip_sum > RT_H2N_U16_C(0xffffU - (1 << 8)))
+        ip->ip_sum += RT_H2N_U16_C(1 << 8) + 1;
+    else
+        ip->ip_sum += RT_H2N_U16_C(1 << 8);
 
     /*