Reduce packet_get_xxx() calls

src/packet/tcp_helpers.h

@@ -0,0 +1,72 @@
+#ifndef _TCP_HELPERS_H
+#define _TCP_HELPERS_H
+
+#ifdef __cpluscplus
+extern "C"
+{
+#endif
+
+#include <arpa/inet.h>
+#define __FAVOR_BSD 1
+#include <netinet/tcp.h>
+
+static inline uint16_t tcp_hdr_get_sport(const struct tcphdr *hdr)
+{
+    return ntohs(hdr->source);
+}
+
+static inline uint16_t tcp_hdr_get_dport(const struct tcphdr *hdr)
+{
+    return ntohs(hdr->dest);
+}
+
+static inline uint32_t tcp_hdr_get_seq(const struct tcphdr *hdr)
+{
+    return ntohl(hdr->seq);
+}
+
+static inline uint32_t tcp_hdr_get_ack(const struct tcphdr *hdr)
+{
+    return ntohl(hdr->ack_seq);
+}
+
+static inline uint8_t tcp_hdr_get_flags(const struct tcphdr *hdr)
+{
+    return hdr->th_flags;
+}
+
+static inline bool tcp_hdr_has_flag_urg(const struct tcphdr *hdr)
+{
+    return hdr->th_flags & TH_URG;
+}
+
+static inline bool tcp_hdr_has_flag_ack(const struct tcphdr *hdr)
+{
+    return hdr->th_flags & TH_ACK;
+}
+
+static inline bool tcp_hdr_has_flag_psh(const struct tcphdr *hdr)
+{
+    return hdr->th_flags & TH_PUSH;
+}
+
+static inline bool tcp_hdr_has_flag_rst(const struct tcphdr *hdr)
+{
+    return hdr->th_flags & TH_RST;
+}
+
+static inline bool tcp_hdr_has_flag_syn(const struct tcphdr *hdr)
+{
+    return hdr->th_flags & TH_SYN;
+}
+
+static inline bool tcp_hdr_has_flag_fin(const struct tcphdr *hdr)
+{
+    return hdr->th_flags & TH_FIN;
+}
+
+#ifdef __cpluscplus
+}
+#endif
+
+#endif