1 files changed, 28 insertions, 0 deletions
diff --git a/analyzer/utils/tcp_seq_math.h b/analyzer/utils/tcp_seq_math.h
new file mode 100644
index 0000000..c4da5f9
--- /dev/null
+++ b/analyzer/utils/tcp_seq_math.h
@@ -0,0 +1,28 @@
+// utils/tcp_seq_math.h
+// helper functions for math regarding tcp sequence numbers which correctly handle overflow
+
+#include <stdint.h>
+
+// check if a is after b
+extern int seq_after(uint32_t a, uint32_t b);
+
+// check if a is before b
+extern int seq_before(uint32_t a, uint32_t b);
+
+// check if a is after or equal to b
+extern int seq_after_eq(uint32_t a, uint32_t b);
+
+// check if a is before or equal to b
+extern int seq_before_eq(uint32_t a, uint32_t b);
+
+// check if value is in [range_start; range_end]
+extern int seq_in_range_ii(uint32_t value, uint32_t range_start, uint32_t range_end);
+
+// check if value is in (range_start; range_end)
+extern int seq_in_range_ee(uint32_t value, uint32_t range_start, uint32_t range_end);
+
+// check if value is in [range_start; range_end)
+extern int seq_in_range_ie(uint32_t value, uint32_t range_start, uint32_t range_end);
+
+// check if value is in (range_start; range_end]
+extern int seq_in_range_ei(uint32_t value, uint32_t range_start, uint32_t range_end);