1 files changed, 85 insertions, 0 deletions
diff --git a/common/include/packet_parser.h b/common/include/packet_parser.h
new file mode 100644
index 0000000..58f475c
--- /dev/null
+++ b/common/include/packet_parser.h
@@ -0,0 +1,85 @@
+#ifndef _PACKET_PARSER_H
+#define _PACKET_PARSER_H
+
+#ifdef __cpluscplus
+extern "C"
+{
+#endif
+
+#include <stdint.h>
+
+enum layer_type
+{
+    // 数据链路层
+    LAYER_TYPE_ETHER = 1 << 0,
+    LAYER_TYPE_PPP = 1 << 1,
+    LAYER_TYPE_HDLC = 1 << 2,
+    LAYER_TYPE_L2 = (LAYER_TYPE_ETHER | LAYER_TYPE_PPP | LAYER_TYPE_HDLC),
+
+    // 数据链路层 -- 隧道
+    LAYER_TYPE_VLAN = 1 << 3,
+    LAYER_TYPE_PPPOE = 1 << 4,
+    LAYER_TYPE_MPLS = 1 << 5,
+    LAYER_TYPE_L2_TUN = (LAYER_TYPE_VLAN | LAYER_TYPE_PPPOE | LAYER_TYPE_MPLS),
+
+    // 网络层
+    LAYER_TYPE_IPV4 = 1 << 6,
+    LAYER_TYPE_IPV6 = 1 << 7,
+    LAYER_TYPE_L3 = (LAYER_TYPE_IPV4 | LAYER_TYPE_IPV6),
+
+    // 网络层 -- 隧道
+
+    // 传输层
+    LAYER_TYPE_UDP = 1 << 8,
+    LAYER_TYPE_TCP = 1 << 9,
+    LAYER_TYPE_L4 = (LAYER_TYPE_UDP | LAYER_TYPE_TCP),
+
+    // 传输层 -- 隧道
+    LAYER_TYPE_G_VXLAN = 1 << 10,
+    LAYER_TYPE_GTPV1_U = 1 << 11,
+
+    // ALL
+    LAYER_TYPE_ALL = (LAYER_TYPE_L2 | LAYER_TYPE_L2_TUN | LAYER_TYPE_L3 | LAYER_TYPE_L4 | LAYER_TYPE_G_VXLAN | LAYER_TYPE_GTPV1_U),
+
+    // UNKNOWN
+    LAYER_TYPE_UNKNOWN,
+};
+
+struct layer_record
+{
+    enum layer_type type;
+    uint16_t hdr_offset;
+    uint16_t hdr_len;
+    uint16_t pld_len;
+};
+
+struct parser_result
+{
+    struct layer_record layers[16];
+    uint16_t used;
+    uint16_t size;
+};
+
+struct packet_parser
+{
+    struct parser_result result;
+
+    const void *packet_data;
+    uint16_t packet_len;
+    uint64_t packet_id;
+};
+
+void packet_parser_init(struct packet_parser *handler);
+const void *packet_parser_parse(struct packet_parser *handler, const void *packet_data, uint16_t packet_len, uint64_t packet_id); // return most inner payload
+const struct layer_record *packet_parser_get_most_inner(struct packet_parser *handler, enum layer_type type);
+const struct layer_record *packet_parser_get_most_outer(struct packet_parser *handler, enum layer_type type);
+
+// return 4: IPv4
+// return 6: IPv6
+uint8_t gtp_next_proto(const char *data);
+
+#ifdef __cpluscplus
+}
+#endif
+
+#endif