158 lines
4.9 KiB
C
158 lines
4.9 KiB
C
#ifndef _VXLAN_H
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#define _VXLAN_H
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#ifdef __cplusplus
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extern "C"
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{
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#endif
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#define __FAVOR_BSD 1
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#include <netinet/udp.h>
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#include "tuple.h"
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/*
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******************************************************************************
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* Standard VXLAN Header:
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******************************************************************************
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*
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* 0 1 2 3
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* 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
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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* |R|R|R|R|I|R|R|R| Reserved |
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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* | VXLAN Network Identifier (VNI) | Reserved |
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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*
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* Flags (8 bits):
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* where the I flag MUST be set to 1 for a valid VXLAN Network ID (VNI).
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* The other 7 bits (designated "R") are reserved fields and MUST be set
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* to zero on transmission and ignored on receipt.
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* Reserved fields (24 bits and 8 bits):
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* MUST be set to zero on transmission and ignored on receipt.
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*
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******************************************************************************
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* SCE VXLAN Header:
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******************************************************************************
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*
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* 0 1 2 3
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* 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
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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* |R|R|R|R|I|R|R|R| Reserved |S| Traffic Link ID |
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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* | high | type | low |D|T|SF index |T| Reserved |
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* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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*
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* Flags : 8 bits
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* Reserved : 7 bits
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* S (StateLess) : 1 bit
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*
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* Traffic Link ID : 16 bits
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*
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* vlan_id_half_high : 8 bits
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* link_layer_type : 4 bits // 二层报文封装格式
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* vlan_id_half_low : 4 bits
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*
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* dir : 1 bit
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* traffic : 1 bit
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* sf_index : 5 bits // max value 32
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* online_test : 1 bit
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*
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* Reserved : 8 bit
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*/
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struct vxlan_hdr
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{
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uint16_t flags_reserved;
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uint16_t link_id;
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uint16_t vlan_id;
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uint16_t user_ctx;
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} __attribute__((__packed__));
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#define VXLAN_DEFAULT_FLAGS 0x8
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#define VXLAN_DST_PORT 4789
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#define VXLAN_FRAME_HDR_LEN ((int)(sizeof(struct ethhdr) + sizeof(struct ip) + sizeof(struct udphdr) + sizeof(struct vxlan_hdr)))
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#define VXLAN_FLAGS_MASK 0xFF00
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#define VXLAN_STATELESS_MASK 0x0001
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#define VXLAN_DIR_MASK 0x8000
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#define VXLAN_TRAFFIC_MASK 0x4000
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#define VXLAN_SF_INDEX_MASK 0x3E00
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static inline void vxlan_set_flags(struct vxlan_hdr *hdr, uint8_t flags)
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{
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hdr->flags_reserved = htons((ntohs(hdr->flags_reserved) & ~VXLAN_FLAGS_MASK) | (flags << 8));
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}
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static inline void vxlan_set_dir(struct vxlan_hdr *hdr, uint8_t val)
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{
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hdr->user_ctx = htons((ntohs(hdr->user_ctx) & ~VXLAN_DIR_MASK) | ((!!val) << 15));
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}
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static inline void vxlan_set_traffic(struct vxlan_hdr *hdr, uint8_t val)
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{
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hdr->user_ctx = htons((ntohs(hdr->user_ctx) & ~VXLAN_TRAFFIC_MASK) | ((!!val) << 14));
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}
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static inline void vxlan_set_sf_index(struct vxlan_hdr *hdr, uint8_t val)
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{
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hdr->user_ctx = htons((ntohs(hdr->user_ctx) & ~VXLAN_SF_INDEX_MASK) | ((val & 0x1F) << 9));
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}
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static inline void vxlan_set_link_id(struct vxlan_hdr *hdr, uint16_t val)
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{
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hdr->link_id = htons(val);
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}
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static inline void vxlan_set_stateless(struct vxlan_hdr *hdr, uint8_t val)
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{
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hdr->flags_reserved = htons((ntohs(hdr->flags_reserved) & ~VXLAN_STATELESS_MASK) | (!!val));
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}
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static inline uint8_t vxlan_get_flags(struct vxlan_hdr *hdr)
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{
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return ((ntohs(hdr->flags_reserved) & VXLAN_FLAGS_MASK) >> 8);
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}
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static inline uint8_t vxlan_get_dir(struct vxlan_hdr *hdr)
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{
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return ((ntohs(hdr->user_ctx) & VXLAN_DIR_MASK) >> 15);
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}
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static inline uint8_t vxlan_get_traffic(struct vxlan_hdr *hdr)
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{
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return ((ntohs(hdr->user_ctx) & VXLAN_TRAFFIC_MASK) >> 14);
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}
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static inline uint8_t vxlan_get_sf_index(struct vxlan_hdr *hdr)
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{
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return ((ntohs(hdr->user_ctx) & VXLAN_SF_INDEX_MASK) >> 9);
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}
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static inline uint16_t vxlan_get_link_id(struct vxlan_hdr *hdr)
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{
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return ntohs(hdr->link_id);
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}
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static inline uint8_t vxlan_get_stateless(struct vxlan_hdr *hdr)
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{
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return ntohs(hdr->flags_reserved) & VXLAN_STATELESS_MASK;
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}
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// return 0 : success
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// return -1 : error
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int vxlan_frame_decode(struct vxlan_hdr **vxlan_hdr, const char *data, int len);
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void vxlan_frame_encode(char *buff,
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const u_char eth_src_mac[], const u_char eth_dst_mac[],
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const in_addr_t ip_src_addr, const in_addr_t ip_dst_addr, uint16_t ip_id,
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uint16_t udp_src_port, uint16_t udp_pld_len,
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uint8_t dir, uint8_t traffic, uint8_t sf_index, uint16_t link_id);
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uint16_t calculate_vxlan_source_port(struct four_tuple *innermost_tuple4);
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#ifdef __cplusplus
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}
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#endif
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#endif
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