From a36b4a9ad6511c0699d0db3b2f9b5e5163c314b4 Mon Sep 17 00:00:00 2001
From: pi-rho <pi-rho@tyr.cx>
Date: Wed, 20 Feb 2013 23:17:59 -0600
Subject: [PATCH] fix ip options skip -- ihl will always be >= 20

---
 src/pcat.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/pcat.c b/src/pcat.c
index 782b1a5..611587d 100644
--- a/src/pcat.c
+++ b/src/pcat.c
@@ -186,7 +186,7 @@ void process_ip4(struct stream *s, FILE *out) {
     DDUMP_d(length);
 
     // Ignore options
-    sskip(s, 20 - ihl);
+    sskip(s, ihl - 20);
 
     // Force stream length to IP payload length
     s->len = length - ihl;