Changeset 57846 in vbox for trunk/src/VBox/Devices/Network

Timestamp:

Sep 21, 2015 7:50:36 PM (9 years ago)

Author:

vboxsync

Message:

SrvIntNetR0: intnetR0NetworkEditDhcpFromIntNet - update UDP checksum
only if present.

File:

• trunk/src/VBox/Devices/Network/SrvIntNetR0.cpp (modified) (1 diff)

trunk/src/VBox/Devices/Network/SrvIntNetR0.cpp

@@ -3491 +3491 @@
 
                 /* Patch UDP checksum */
-                uint32_t uChecksum = (uint32_t)~pUdpHdr->uh_sum + RT_H2BE_U16_C(RTNET_DHCP_FLAG_BROADCAST);
-                while (uChecksum >> 16)
-                    uChecksum = (uChecksum >> 16) + (uChecksum & 0xFFFF);
-                uChecksum = ~uChecksum;
-                intnetR0SgWritePart(pSG, (uintptr_t)&pUdpHdr->uh_sum - (uintptr_t)pIpHdr + sizeof(RTNETETHERHDR), sizeof(pUdpHdr->uh_sum), &uChecksum);
+                if (pUdpHdr->uh_sum != 0)
+                {
+                    uint32_t uChecksum = (uint32_t)~pUdpHdr->uh_sum + RT_H2BE_U16_C(RTNET_DHCP_FLAG_BROADCAST);
+                    while (uChecksum >> 16)
+                        uChecksum = (uChecksum >> 16) + (uChecksum & 0xFFFF);
+                    uChecksum = ~uChecksum;
+                    intnetR0SgWritePart(pSG,
+                                        (uintptr_t)&pUdpHdr->uh_sum - (uintptr_t)pIpHdr + sizeof(RTNETETHERHDR),
+                                        sizeof(pUdpHdr->uh_sum),
+                                        &uChecksum);
+                }
             }