arp.c

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#include "arp.h"
#include "ethernet.h"
#include <str.h>
#include "netutils.h"
 
void arp_reply(netdev_t* dev, uint32_t ip, uint8_t out_mac[6]) {
    auto netbuff = create_netbuff();
 
    struct arp_packet* reply = (struct arp_packet*) netbuff_put(
        netbuff, sizeof(struct arp_packet));
 
    // arp
    reply->htype = 0x0100; // htons(1) → Ethernet
    reply->ptype = 0x0008; // htons(0x0800) → IPv4
    reply->hlen = 6;
    reply->plen = 4;
    reply->oper = 0x0200; // htons(2) → reply
 
    // sender = kita
    memcopy(reply->sender_mac, dev->mac, 6);
    reply->sender_ip = vxInetAddr("192.168.100.80");
 
    // target = pengirim request
    memcopy(reply->target_mac, out_mac, 6);
    reply->target_ip = ip;
 
    ethernet_send_frame(dev, netbuff, 0x0608, out_mac);
 
    free_netbuff(netbuff);
}