/*
- * Copyright (c) 2009, 2010, 2011 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.
#include <stdlib.h>
#include "byte-order.h"
#include "csum.h"
+#include "flow.h"
#include "dynamic-string.h"
#include "ofpbuf.h"
uh->udp_dst = dst;
}
}
+
+/* If 'packet' is a TCP packet, returns the TCP flags. Otherwise, returns 0.
+ *
+ * 'flow' must be the flow corresponding to 'packet' and 'packet''s header
+ * pointers must be properly initialized (e.g. with flow_extract()). */
+uint8_t
+packet_get_tcp_flags(const struct ofpbuf *packet, const struct flow *flow)
+{
+ if ((flow->dl_type == htons(ETH_TYPE_IP) ||
+ flow->dl_type == htons(ETH_TYPE_IPV6)) &&
+ flow->nw_proto == IPPROTO_TCP && packet->l7) {
+ const struct tcp_header *tcp = packet->l4;
+ return TCP_FLAGS(tcp->tcp_ctl);
+ } else {
+ 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]");
+ }
+}