X-Git-Url: https://pintos-os.org/cgi-bin/gitweb.cgi?a=blobdiff_plain;f=lib%2Fpackets.c;h=84ca590bda90d23af12b1f8a9d82f2813728faa1;hb=b98d8985b6c7fe0d63542e3f79b2686eaeab7ade;hp=8fb7f6b0320fac2a7fabcb02f6bd820420a91e8a;hpb=734ec5ec13499a2e7112626564cc9bd0c2d06600;p=openvswitch

diff --git a/lib/packets.c b/lib/packets.c
index 8fb7f6b0..84ca590b 100644
--- a/lib/packets.c
+++ b/lib/packets.c
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2009, 2010, 2011, 2012 Nicira Networks.
+ * Copyright (c) 2009, 2010, 2011, 2012 Nicira, Inc.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -496,3 +496,40 @@ packet_get_tcp_flags(const struct ofpbuf *packet, const struct flow *flow)
         return 0;
     }
 }
+
+/* Appends a string representation of the TCP flags value 'tcp_flags'
+ * (e.g. obtained via packet_get_tcp_flags() or TCP_FLAGS) to 's', in the
+ * format used by tcpdump. */
+void
+packet_format_tcp_flags(struct ds *s, uint8_t tcp_flags)
+{
+    if (!tcp_flags) {
+        ds_put_cstr(s, "none");
+        return;
+    }
+
+    if (tcp_flags & TCP_SYN) {
+        ds_put_char(s, 'S');
+    }
+    if (tcp_flags & TCP_FIN) {
+        ds_put_char(s, 'F');
+    }
+    if (tcp_flags & TCP_PSH) {
+        ds_put_char(s, 'P');
+    }
+    if (tcp_flags & TCP_RST) {
+        ds_put_char(s, 'R');
+    }
+    if (tcp_flags & TCP_URG) {
+        ds_put_char(s, 'U');
+    }
+    if (tcp_flags & TCP_ACK) {
+        ds_put_char(s, '.');
+    }
+    if (tcp_flags & 0x40) {
+        ds_put_cstr(s, "[40]");
+    }
+    if (tcp_flags & 0x80) {
+        ds_put_cstr(s, "[80]");
+    }
+}