1 files changed, 28 insertions, 0 deletions
diff --git a/net/arp.h b/net/arp.h
new file mode 100644
index 0000000..a690ac0
--- /dev/null
+++ b/net/arp.h
@@ -0,0 +1,28 @@
+// http://www.saminiir.com/lets-code-tcp-ip-stack-1-ethernet-arp/
+//
+
+#include <stdint.h>
+
+#include "netdev.h"
+
+struct arp_hdr
+{
+    uint16_t hwtype;	    // link layer type (1 - ethernet)
+    uint16_t protype;	    // protocol (0x800 - ipv4)
+    unsigned char hwsize;   // hardware field size (6 bytes mac)
+    unsigned char prosize;  // protocol field size (4 byte ip)
+    uint16_t opcode;	    // arp message type (1- arp request, 2- arp reply, 3- rarp request, 4- rarp reply)
+    unsigned char data[];   // payload
+} __attribute__((packed));
+
+// arp ipv4 payload
+struct arp_ipv4
+{
+    unsigned char smac[6];  // sender mac
+    uint32_t sip;	    // sender ip
+    unsigned char dmac[6];  // receiver mac
+    uint32_t dip;	    // receiver ip
+} __attribute__((packed));
+
+void arp_incoming(struct netdev *netdev, struct eth_hdr *hdr);
+void arp_reply(struct netdev *netdev, struct eth_hdr *hdr, struct arp_hdr *arphdr);