Changeset c8e8122 for tools

Timestamp:

11/22/09 00:56:10 (12 years ago)

Author:

Andreas Löf <andreas.lof@…>

Branches:

4.0.1-hotfixes, cachetimestamps, develop, dpdk-ndag, etsilive, getfragoff, help, libtrace4, master, ndag_format, pfring, rc-4.0.1, rc-4.0.2, rc-4.0.3, rc-4.0.4, ringdecrementfix, ringperformance, ringtimestampfixes

Children:

c988da9

Parents:

47a5c5e

Message:

added a function to calculate checksums

File:

• tools/tracereplay/tracereplay.c (modified) (2 diffs)

tools/tracereplay/tracereplay.c

@@ -24 +24 @@
 #include <getopt.h>
 
+#define FCS_SIZE 4
+
 static libtrace_packet_t * per_packet(libtrace_packet_t *packet) {
   
@@ -33 +35 @@
   size_t wire_length = trace_get_wire_length(packet);
 
+  if(linktype == TRACE_TYPE_ETH || linktype == TRACE_TYPE_80211) {
+    wire_length -= FCS_SIZE;
+  }
+
   trace_construct_packet(new_packet,linktype,pkt_buffer,wire_length);
 
   return new_packet;
   
+}
+
+
+/* This function assumes that the relevant fields have been zeroed out */
+static uint16_t checksum(void * buffer, size_t length) {
+  uint8_t * data;
+  int i;
+  uint16_t result = 0;
+
+
+  data = (uint8_t) buffer;
+
+
+
+  for(i = 0; i < length; i++) {
+    result = ~data[i];
+  }
+  
+  return ~result;
+
 }