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// MIT License, Copyright (c) 2020 Marvin Borner
#ifndef NET_H
#define NET_H
#include <def.h>
#define htonl(l) \
((((l)&0xFF) << 24) | (((l)&0xFF00) << 8) | (((l)&0xFF0000) >> 8) | \
(((l)&0xFF000000) >> 24))
#define htons(s) ((((s)&0xFF) << 8) | (((s)&0xFF00) >> 8))
#define ntohl(l) htonl((l))
#define ntohs(s) htons((s))
#define ETHERNET_TYPE_IP4 0x0800
#define ETHERNET_TYPE_IP6 0x86dd
#define ETHERNET_TYPE_ARP 0x0806
#define IP_PROT_ICMP 0x01
#define IP_PROT_TCP 0x06
#define IP_PROT_UDP 0x11
#define ARP_REQUEST 1
#define ARP_REPLY 2
#define DHCP_REQUEST 1
#define DHCP_REPLY 2
#define DHCP_TRANSACTION_IDENTIFIER 0x55555555
#define HARDWARE_TYPE_ETHERNET 0x01
// Protocol structs
struct ethernet_packet {
u8 dst[6];
u8 src[6];
u16 type;
u8 data[];
} __attribute__((packed));
struct arp_packet {
u16 hardware_type;
u16 protocol;
u8 hardware_addr_len;
u8 protocol_addr_len;
u16 opcode;
u8 src_mac[6];
u32 src_protocol_addr;
u8 dst_mac[6];
u32 dst_protocol_addr;
} __attribute__((packed));
struct ip_packet {
u8 version_ihl;
u8 dscp_ecn;
u16 length;
u16 id;
u16 flags_fragment;
u8 ttl;
u8 protocol;
u16 checksum;
u32 src;
u32 dst;
u8 data[];
} __attribute__((packed));
struct dhcp_packet {
u8 op;
u8 hardware_type;
u8 hardware_addr_len;
u8 hops;
u32 xid;
u16 seconds;
u16 flags;
u32 client_ip;
u32 your_ip;
u32 server_ip;
u32 gateway_ip;
u8 client_hardware_addr[16];
u8 server_name[64];
u8 file[128];
u8 options[64];
} __attribute__((packed));
struct udp_packet {
u16 src_port;
u16 dst_port;
u16 length;
u16 checksum;
u8 data[];
} __attribute__((packed));
struct icmp_packet {
u8 type;
u8 version;
u16 checksum;
} __attribute__((packed));
// Other structs
struct arp_table_entry {
u32 ip_addr;
u64 mac_addr;
};
void ethernet_handle_packet(struct ethernet_packet *packet, int len);
void net_install();
#endif
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