TSG-17749 tsg-service-chaining-engine更改VXLAN Frame源端口的计算方式

common/include/vxlan.h

@@ -0,0 +1,89 @@
+#ifndef _VXLAN_H
+#define _VXLAN_H
+
+#ifdef __cpluscplus
+extern "C"
+{
+#endif
+
+#define __FAVOR_BSD 1
+#include <netinet/udp.h>
+
+#include "tuple.h"
+
+/*
+ * VXLAN Header:
+ *
+ *   0                   1                   2                   3
+ *   0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+ *  +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ *  |R|R|R|R|I|R|R|R|            Reserved                           |
+ *  +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ *  |                VXLAN Network Identifier (VNI) |   Reserved    |
+ *  +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ *
+ * Flags (8 bits):
+ *       where the I flag MUST be set to 1 for a valid VXLAN Network ID (VNI).
+ *       The other 7 bits (designated "R") are reserved fields and MUST be set
+ *       to zero on transmission and ignored on receipt.
+ * Reserved fields (24 bits and 8 bits):
+ *       MUST be set to zero on transmission and ignored on receipt.
+ */
+
+struct vxlan_hdr
+{
+	uint8_t flags;
+	uint8_t reserved[3];
+
+	// VNI 3 Bytes
+	uint8_t vlan_id_half_high;
+
+	uint8_t link_layer_type : 4; // 二层报文封装格式
+	uint8_t vlan_id_half_low : 4;
+
+	uint8_t dir : 1;
+	uint8_t traffic : 1;
+	uint8_t sf_index : 5; // max value 32
+	uint8_t online_test : 1;
+
+	// Reserved 1 Bytes
+	uint8_t r7 : 1;
+	uint8_t r6 : 1;
+	uint8_t r5 : 1;
+	uint8_t r4 : 1;
+	uint8_t vni_flag : 1;
+	uint8_t r2 : 1;
+	uint8_t r1 : 1;
+	uint8_t r0 : 1;
+} __attribute__((__packed__));
+
+enum vni_opt
+{
+	VNI_OPT_DIR = 0x80,
+	VNI_OPT_TRAFFIC = 0x40,
+	VNI_OPT_SFINDEX = 0x3f,
+};
+
+#define VXLAN_FLAGS 0x8
+#define VXLAN_DST_PORT 4789
+#define VXLAN_FRAME_HDR_LEN (sizeof(struct ethhdr) + sizeof(struct ip) + sizeof(struct udphdr) + sizeof(struct vxlan_hdr))
+
+void vxlan_set_opt(struct vxlan_hdr *hdr, enum vni_opt opt, uint8_t val);
+uint8_t vxlan_get_opt(struct vxlan_hdr *hdr, enum vni_opt opt);
+
+// return  0 : success
+// return -1 : error
+int vxlan_frame_decode(struct vxlan_hdr **vxlan_hdr, const char *data, uint16_t len);
+void vxlan_frame_encode(char *buff,
+						const u_char eth_src_mac[], const u_char eth_dst_mac[],
+						const in_addr_t ip_src_addr, const in_addr_t ip_dst_addr, uint16_t ip_id,
+						uint16_t udp_src_port, uint16_t udp_pld_len,
+						uint8_t vni_opt_dir, uint8_t vni_opt_traffic, uint8_t vni_opt_sf_index);
+
+uint16_t calculate_vxlan_source_port(struct four_tuple *innermost_tuple4);
+
+#ifdef __cpluscplus
+}
+#endif
+
+#endif