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protocols.c
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#include <rflpc17xx/rflpc17xx.h>
#include "protocols.h"
/*Compute the IP header checksum. All fields have to be set to 0 (including the checksum field, size in 16 bits word of data*/
uint16_t get_checksum(uint8_t* data, uint8_t size){
uint8_t i;
uint32_t checksum = 0;
for(i=0 ; i < size ; i++, data+=2)
checksum += (*data<<8) + *(data+1);
checksum = (checksum >> 16) + (checksum & 0xffff);
checksum = (checksum >> 16) + (checksum & 0xffff);
return (~checksum)&0xffff;
}
#define ETHER_TYPE_IPV4 0
#define ETHER_TYPE_ARP 1
void fill_ethernet_header(uint8_t* buffer, uint8_t dest_mac_addr[6], uint8_t ether_type){
extern uint8_t mac_addr[6];
((ETHERNET_HEADER*)buffer)->dest[0]=dest_mac_addr[0];
((ETHERNET_HEADER*)buffer)->dest[1]=dest_mac_addr[1];
((ETHERNET_HEADER*)buffer)->dest[2]=dest_mac_addr[2];
((ETHERNET_HEADER*)buffer)->dest[3]=dest_mac_addr[3];
((ETHERNET_HEADER*)buffer)->dest[4]=dest_mac_addr[4];
((ETHERNET_HEADER*)buffer)->dest[5]=dest_mac_addr[5];
((ETHERNET_HEADER*)buffer)->source[0]=mac_addr[0];
((ETHERNET_HEADER*)buffer)->source[1]=mac_addr[1];
((ETHERNET_HEADER*)buffer)->source[2]=mac_addr[2];
((ETHERNET_HEADER*)buffer)->source[3]=mac_addr[3];
((ETHERNET_HEADER*)buffer)->source[4]=mac_addr[4];
((ETHERNET_HEADER*)buffer)->source[5]=mac_addr[5];
switch(ether_type){
case ETHER_TYPE_IPV4 :
((ETHERNET_HEADER*)buffer)->ether_type[0]=0x08;
((ETHERNET_HEADER*)buffer)->ether_type[1]=0x00;
break;
case ETHER_TYPE_ARP :
((ETHERNET_HEADER*)buffer)->ether_type[0]=0x08;
((ETHERNET_HEADER*)buffer)->ether_type[1]=0x06;
break;
}
}
void ping_request(uint8_t* buffer, uint8_t dest_mac_addr[6], uint8_t dest_ip_addr[4]){
uint16_t checksum;
extern uint8_t ip_addr[4];
fill_ethernet_header(buffer,dest_mac_addr,ETHER_TYPE_IPV4);
((IP_HEADER*)(buffer+14))->vers_ihl = 0x45;
((IP_HEADER*)(buffer+14))->service = 0x0;
((IP_HEADER*)(buffer+14))->total_length[0] = 0;
((IP_HEADER*)(buffer+14))->total_length[1] = 28;
((IP_HEADER*)(buffer+14))->ttl = 128;
((IP_HEADER*)(buffer+14))->id[0] = 0;
((IP_HEADER*)(buffer+14))->id[1] = 0;
((IP_HEADER*)(buffer+14))->flags_fragment_position[0] = 0;
((IP_HEADER*)(buffer+14))->flags_fragment_position[1] = 0;
((IP_HEADER*)(buffer+14))->protocol = 1;
((IP_HEADER*)(buffer+14))->ip_source[0] = ip_addr[0];
((IP_HEADER*)(buffer+14))->ip_source[1] = ip_addr[1];
((IP_HEADER*)(buffer+14))->ip_source[2] = ip_addr[2];
((IP_HEADER*)(buffer+14))->ip_source[3] = ip_addr[3];
((IP_HEADER*)(buffer+14))->ip_dest[0] = dest_ip_addr[0];
((IP_HEADER*)(buffer+14))->ip_dest[1] = dest_ip_addr[1];
((IP_HEADER*)(buffer+14))->ip_dest[2] = dest_ip_addr[2];
((IP_HEADER*)(buffer+14))->ip_dest[3] = dest_ip_addr[3];
((IP_HEADER*)(buffer+14))->checksum[0] = 0x0;
((IP_HEADER*)(buffer+14))->checksum[1] = 0x0;
checksum = get_checksum((uint8_t*)(buffer+14), (((IP_HEADER*)(buffer+14))->vers_ihl & 0xf)*2);
((IP_HEADER*)(buffer+14))->checksum[0] = (checksum>>8) & 0xff;
((IP_HEADER*)(buffer+14))->checksum[1] = checksum & 0xff;
((ICMP_HEADER*)(buffer+34))->type = 8;
((ICMP_HEADER*)(buffer+34))->code = 0;
checksum = get_checksum((uint8_t*)(buffer+34), 4);
((ICMP_HEADER*)(buffer+34))->checksum[0] = 0x0;
((ICMP_HEADER*)(buffer+34))->checksum[1] = 0x0;
((ICMP_HEADER*)(buffer+34))->checksum[0] = (checksum>>8) & 0xff;
((ICMP_HEADER*)(buffer+34))->checksum[1] = checksum & 0xff;
}
void pong_request(uint8_t* buffer, uint8_t dest_mac_addr[6], uint8_t dest_ip_addr[4], uint8_t id[2], uint8_t seq[2], const uint8_t* data, uint8_t data_size){
uint16_t checksum;
extern uint8_t ip_addr[4];
fill_ethernet_header(buffer,dest_mac_addr,ETHER_TYPE_IPV4);
((IP_HEADER*)(buffer+14))->vers_ihl = 0x45;
((IP_HEADER*)(buffer+14))->service = 0;
((IP_HEADER*)(buffer+14))->total_length[0] = 0;
((IP_HEADER*)(buffer+14))->total_length[1] = 28+data_size;
((IP_HEADER*)(buffer+14))->id[0] = 0;
((IP_HEADER*)(buffer+14))->id[1] = 0;
((IP_HEADER*)(buffer+14))->flags_fragment_position[0] = 0;
((IP_HEADER*)(buffer+14))->flags_fragment_position[1] = 0;
((IP_HEADER*)(buffer+14))->ttl = 128;
((IP_HEADER*)(buffer+14))->protocol = 1;
((IP_HEADER*)(buffer+14))->ip_source[0] = ip_addr[0];
((IP_HEADER*)(buffer+14))->ip_source[1] = ip_addr[1];
((IP_HEADER*)(buffer+14))->ip_source[2] = ip_addr[2];
((IP_HEADER*)(buffer+14))->ip_source[3] = ip_addr[3];
((IP_HEADER*)(buffer+14))->ip_dest[0] = dest_ip_addr[0];
((IP_HEADER*)(buffer+14))->ip_dest[1] = dest_ip_addr[1];
((IP_HEADER*)(buffer+14))->ip_dest[2] = dest_ip_addr[2];
((IP_HEADER*)(buffer+14))->ip_dest[3] = dest_ip_addr[3];
((IP_HEADER*)(buffer+14))->checksum[0] = 0x0;
((IP_HEADER*)(buffer+14))->checksum[1] = 0x0;
checksum = get_checksum((uint8_t*)(buffer+14), (((IP_HEADER*)(buffer+14))->vers_ihl & 0xf)*2);
((IP_HEADER*)(buffer+14))->checksum[0] = (checksum>>8) & 0xff;
((IP_HEADER*)(buffer+14))->checksum[1] = checksum & 0xff;
((ICMP_HEADER*)(buffer+34))->type = 0;
((ICMP_HEADER*)(buffer+34))->code = 0;
((ICMP_HEADER*)(buffer+34))->id[0] = id[0];
((ICMP_HEADER*)(buffer+34))->id[1] = id[1];
((ICMP_HEADER*)(buffer+34))->seq_num[0] = seq[0];
((ICMP_HEADER*)(buffer+34))->seq_num[1] = seq[1];
((ICMP_HEADER*)(buffer+34))->checksum[0] = 0x0;
((ICMP_HEADER*)(buffer+34))->checksum[1] = 0x0;
memcpy(buffer+42,data,data_size);
checksum = get_checksum((uint8_t*)(buffer+34), 4+data_size);
((ICMP_HEADER*)(buffer+34))->checksum[0] = (checksum>>8) & 0xff;
((ICMP_HEADER*)(buffer+34))->checksum[1] = checksum & 0xff;
}
void arp_request(uint8_t* buffer, uint8_t dest_mac_addr[6], uint8_t dest_ip_addr[4], uint8_t source_mac_addr[6], uint8_t source_ip_addr[4]){
fill_ethernet_header(buffer,dest_mac_addr,ETHER_TYPE_ARP);
((ARP_HEADER*)(buffer+14))->network_type[0] = 0;
((ARP_HEADER*)(buffer+14))->network_type[1] = 1; /*ETHERNET*/
((ARP_HEADER*)(buffer+14))->protocol_type[0] = 0x08; /*IP*/
((ARP_HEADER*)(buffer+14))->protocol_type[1] = 0x00;
((ARP_HEADER*)(buffer+14))->hardware_addr_length = 6; /*ETHERNET*/
((ARP_HEADER*)(buffer+14))->logical_addr_length = 4; /*IPv4*/
((ARP_HEADER*)(buffer+14))->operation[0] = 0;
((ARP_HEADER*)(buffer+14))->operation[1] = 2; /* 1->REQUEST || 2->REPLY*/
((ARP_HEADER*)(buffer+14))->sender_hardware_addr[0] = source_mac_addr[0];
((ARP_HEADER*)(buffer+14))->sender_hardware_addr[1] = source_mac_addr[1];
((ARP_HEADER*)(buffer+14))->sender_hardware_addr[2] = source_mac_addr[2];
((ARP_HEADER*)(buffer+14))->sender_hardware_addr[3] = source_mac_addr[3];
((ARP_HEADER*)(buffer+14))->sender_hardware_addr[4] = source_mac_addr[4];
((ARP_HEADER*)(buffer+14))->sender_hardware_addr[5] = source_mac_addr[5];
((ARP_HEADER*)(buffer+14))->sender_logical_addr[0] = source_ip_addr[0];
((ARP_HEADER*)(buffer+14))->sender_logical_addr[1] = source_ip_addr[1];
((ARP_HEADER*)(buffer+14))->sender_logical_addr[2] = source_ip_addr[2];
((ARP_HEADER*)(buffer+14))->sender_logical_addr[3] = source_ip_addr[3];
((ARP_HEADER*)(buffer+14))->target_hardware_addr[0] = dest_mac_addr[0];
((ARP_HEADER*)(buffer+14))->target_hardware_addr[1] = dest_mac_addr[1];
((ARP_HEADER*)(buffer+14))->target_hardware_addr[2] = dest_mac_addr[2];
((ARP_HEADER*)(buffer+14))->target_hardware_addr[3] = dest_mac_addr[3];
((ARP_HEADER*)(buffer+14))->target_hardware_addr[4] = dest_mac_addr[4];
((ARP_HEADER*)(buffer+14))->target_hardware_addr[5] = dest_mac_addr[5];
((ARP_HEADER*)(buffer+14))->target_logical_addr[0] = dest_ip_addr[0];
((ARP_HEADER*)(buffer+14))->target_logical_addr[1] = dest_ip_addr[1];
((ARP_HEADER*)(buffer+14))->target_logical_addr[2] = dest_ip_addr[2];
((ARP_HEADER*)(buffer+14))->target_logical_addr[3] = dest_ip_addr[3];
}