53 lines
1.5 KiB
C
53 lines
1.5 KiB
C
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#ifndef __ETH_UDP_H__
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#define __ETH_UDP_H__
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#include "stdint.h"
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#define UDP_CHECKSUM_ENABLE 1
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struct udp_cfg_s {
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char *mac_src;
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char *mac_dst;
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char *ip_src;
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char *ip_dst;
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char *port_src;
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char *port_dst;
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};
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struct udp_header_s {
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uint8_t preamble[2]; // fixed 55 D5
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/* MAC */
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uint8_t mac_dst[6];
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uint8_t mac_src[6];
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uint8_t ip_type[2]; // 08 00 for IPv4 type
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/* IP */
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uint8_t ver_head_length; // 0x45 for IPv4 and head length is 5*4=20 bytes
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uint8_t tos; // type of service, normal 0
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uint8_t ip_total_length[2]; // 28 + user data length, e.g. 00 20 for 32 bytes
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uint8_t id[2];
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uint8_t offset[2];
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uint8_t ttl; // time to live, normal 0x80
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uint8_t prototal; // 0x11 for UDP prototal
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uint8_t ip_checksum[2]; // normal 00 00
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uint8_t ip_src[4]; // e.g. C0 A8 02 18 is for 192.168.2.24
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uint8_t ip_dst[4]; // e.g. C0 A8 02 20 is for 192.168.2.32
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/* UDP */
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uint8_t port_src[2]; // e.g. 26 E5 is for 9957
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uint8_t port_dst[2]; // e.g. 0E D3 is for 3795
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uint8_t udp_total_length[2]; // 8 + user data length, e.g. 00 0C for 12 bytes
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uint8_t udp_checksum[2];
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};
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#ifdef __cplusplus
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extern "C" {
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#endif
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int udp_create_default(struct udp_cfg_s *cfg, struct udp_header_s *udp);
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uint32_t *udp_copy_header(uint32_t *dst, struct udp_header_s *udp);
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uint16_t udp_pack_data(struct udp_header_s *udp, uint16_t length);
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#ifdef __cplusplus
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}
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#endif
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#endif /* __ETH_UDP_H__ */
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