From db1f6609d13a888dd7212c9ed2840846e70a284e Mon Sep 17 00:00:00 2001
From: Andreas Baumann <mail@andreasbaumann.cc>
Date: Wed, 2 Aug 2017 18:26:23 +0200
Subject: added an IPv4 module, currently containg an address to string
 function started to add ARP packet definition, reading and printing ARP
 request now some renames in networking layer

---
 src/net/arp.c      |  1 +
 src/net/arp.h      | 36 ++++++++++++++++++++++++++++++++++++
 src/net/ethernet.c |  2 +-
 src/net/ethernet.h | 14 +++++++++-----
 src/net/ipv4.c     | 13 +++++++++++++
 src/net/ipv4.h     | 18 ++++++++++++++++++
 6 files changed, 78 insertions(+), 6 deletions(-)
 create mode 100644 src/net/arp.c
 create mode 100644 src/net/arp.h
 create mode 100644 src/net/ipv4.c
 create mode 100644 src/net/ipv4.h

(limited to 'src/net')

diff --git a/src/net/arp.c b/src/net/arp.c
new file mode 100644
index 0000000..1f30b09
--- /dev/null
+++ b/src/net/arp.c
@@ -0,0 +1 @@
+#include "arp.h"
diff --git a/src/net/arp.h b/src/net/arp.h
new file mode 100644
index 0000000..ba8de42
--- /dev/null
+++ b/src/net/arp.h
@@ -0,0 +1,36 @@
+#ifndef ARP_H
+#define ARP_H
+
+#include "ethernet.h"
+#include "ipv4.h"
+
+#if defined( __TINYC__ )
+#pragma pack(1)
+#endif
+
+typedef uint16_t network_hardware_type_t;
+
+// TODO: network order not host oder, so for now swap it
+#define ARP_HARDWARE_TYPE_ETHERNET (network_hardware_type_t)0x0100
+
+#define ARP_OPERATION_REQUEST 0x0100
+#define ARP_OPERATION_ANSWER 0x0200
+
+// TODO: fixed size structure, works for Ethernet MACs and IPv4 addresses
+typedef struct {
+	network_hardware_type_t hardware_type;
+	network_ether_type_t protocol_type;
+	uint8_t hardware_address_len;
+	uint8_t protocol_address_len;
+	uint16_t operation;
+	network_mac_address_t source_hardware_address;
+	network_ipv4_address_t source_protocol_address;
+	network_mac_address_t destination_hardware_address;
+	network_ipv4_address_t destination_protocol_address;
+} __attribute__( ( packed ) ) network_arp_packet_t;
+
+#if defined( __TINYC__ )
+#pragma pack()
+#endif
+
+#endif // ARP_H
diff --git a/src/net/ethernet.c b/src/net/ethernet.c
index 48db20c..bf8bb93 100644
--- a/src/net/ethernet.c
+++ b/src/net/ethernet.c
@@ -2,7 +2,7 @@
 
 #include "stdio.h"
 
-char *network_mac_to_string( network_mac_address_t mac, char *buf, size_t buflen )
+char *network_mac_address_to_string( network_mac_address_t mac, char *buf, size_t buflen )
 {
 	snprintf( buf, buflen, "%X:%X:%X:%X:%X:%X",
 		mac.byte[0], mac.byte[1], mac.byte[2],
diff --git a/src/net/ethernet.h b/src/net/ethernet.h
index a2726e7..faeddf5 100644
--- a/src/net/ethernet.h
+++ b/src/net/ethernet.h
@@ -5,14 +5,18 @@
 
 #define NETWORK_ETHERNET_MAC_ADDR_STRING 6 * 3 + 1
 
+// hardware_address_len
+#define NETWORK_HARDWARE_ETHERNET_ADDRESS_LENGTH 6
+
 typedef struct {
-	uint8_t byte[6];
+	uint8_t byte[NETWORK_HARDWARE_ETHERNET_ADDRESS_LENGTH];
 } network_mac_address_t;
 
-typedef uint16_t ether_type_t;
+typedef uint16_t network_ether_type_t;
 
 // TODO: network order not host oder, so for now swap it
-#define NETWORK_ETHER_TYPE_ARP 0x0608
+#define NETWORK_ETHER_PROTOCOL_TYPE_ARP (network_ether_type_t)0x0608
+#define NETWORK_ETHER_PROTOCOL_TYPE_IPV4 (network_ether_type_t)0x0008
 
 #if defined( __TINYC__ )
 #pragma pack(1)
@@ -21,7 +25,7 @@ typedef uint16_t ether_type_t;
 typedef struct {
 	network_mac_address_t dst_addr;
 	network_mac_address_t src_addr;
-	ether_type_t type;
+	network_ether_type_t type;
 } __attribute__( ( packed ) ) network_ethernet_packet_header_t;
 
 typedef struct {
@@ -33,6 +37,6 @@ typedef struct {
 #pragma pack()
 #endif
 
-char *network_mac_to_string( network_mac_address_t mac, char *buf, size_t buflen );
+char *network_mac_address_to_string( network_mac_address_t mac, char *buf, size_t buflen );
 
 #endif // ETHERNET_H
diff --git a/src/net/ipv4.c b/src/net/ipv4.c
new file mode 100644
index 0000000..38ae7da
--- /dev/null
+++ b/src/net/ipv4.c
@@ -0,0 +1,13 @@
+#include "ipv4.h"
+
+#include "stdio.h"
+
+char *network_ipv4_address_to_string( network_ipv4_address_t addr, char *buf, size_t buflen )
+{
+	snprintf( buf, buflen, "%d.%d.%d.%d",
+		addr.byte[0], addr.byte[1],
+		addr.byte[2], addr.byte[3] );
+
+	return buf;
+}
+
diff --git a/src/net/ipv4.h b/src/net/ipv4.h
new file mode 100644
index 0000000..acf7f7f
--- /dev/null
+++ b/src/net/ipv4.h
@@ -0,0 +1,18 @@
+#ifndef IPV4_H
+#define IPV4_H
+
+#include "stdint.h"
+#include "stddef.h"
+
+#define NETWORK_PROTOCOL_IPV4_ADDR_STRING 4 * 4 + 1
+
+// protocol_address_len
+#define NETWORK_PROTOCOL_IPV4_ADDRESS_LENGTH 4
+
+typedef struct {
+	uint8_t byte[NETWORK_PROTOCOL_IPV4_ADDRESS_LENGTH];
+} network_ipv4_address_t;
+
+char *network_ipv4_address_to_string( network_ipv4_address_t addr, char *buf, size_t buflen );
+
+#endif // IPV4_H
-- 
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