1 /******************************************************************************
2 * Copyright (c) 2004, 2008 IBM Corporation
4 * This program and the accompanying materials
5 * are made available under the terms of the BSD License
6 * which accompanies this distribution, and is available at
7 * http://www.opensource.org/licenses/bsd-license.php
10 * IBM Corporation - initial implementation
11 *****************************************************************************/
22 * A header for IP-packets.
23 * For more information see RFC 791.
26 uint8_t ip_hlv; /**< Header length and version of the header */
27 uint8_t ip_tos; /**< Type of Service */
28 uint16_t ip_len; /**< Length in octets, inlc. this header and data */
29 uint16_t ip_id; /**< ID is used to aid in assembling framents */
30 uint16_t ip_off; /**< Info about fragmentation (control, offset) */
31 uint8_t ip_ttl; /**< Time to Live */
32 uint8_t ip_p; /**< Next level protocol type */
33 uint16_t ip_sum; /**< Header checksum */
34 uint32_t ip_src; /**< Source IP address */
35 uint32_t ip_dst; /**< Destination IP address */
37 typedef struct iphdr ipv4_hdr_t;
39 /* ICMP Error Codes */
40 #define ICMP_NET_UNREACHABLE 0
41 #define ICMP_HOST_UNREACHABLE 1
42 #define ICMP_PROTOCOL_UNREACHABLE 2
43 #define ICMP_PORT_UNREACHABLE 3
44 #define ICMP_FRAGMENTATION_NEEDED 4
45 #define ICMP_SOURCE_ROUTE_FAILED 5
48 * A header for ARP-messages, retains info about HW and proto addresses.
49 * For more information see RFC 826.
52 uint16_t hw_type; /**< HW address space (1 for Ethernet) */
53 uint16_t proto_type; /**< Protocol address space */
54 uint8_t hw_len; /**< Byte length of each HW address */
55 uint8_t proto_len; /**< Byte length of each proto address */
56 uint16_t opcode; /**< Identifies is it request (1) or reply (2) */
57 uint8_t src_mac[6]; /**< HW address of sender of this packet */
58 uint32_t src_ip; /**< Proto address of sender of this packet */
59 uint8_t dest_mac[6]; /**< HW address of target of this packet */
60 uint32_t dest_ip; /**< Proto address of target of this packet */
61 } __attribute((packed));
63 /************** Initialization of the IPv4 network layer. **************/
64 extern void set_ipv4_address(uint32_t own_ip);
65 extern uint32_t get_ipv4_address(void);
66 extern void set_ipv4_multicast(uint32_t multicast_ip);
67 extern uint32_t get_ipv4_multicast(void);
68 extern void set_ipv4_router(uint32_t router_ip);
69 extern uint32_t get_ipv4_router(void);
70 extern void set_ipv4_netmask(uint32_t subnet_mask);
71 extern uint32_t get_ipv4_netmask(void);
73 extern int (*send_ip) (int fd, void *, int);
76 extern void fill_iphdr(uint8_t * packet, uint16_t packetsize,
77 uint8_t ip_proto, uint32_t ip_src, uint32_t ip_dst);
79 /* Send a IPv4 packet. Adding the Ethernet-Header and resolving the
80 * MAC address is done transparent in the background if necessary.
82 extern int send_ipv4(int fd, void* buffer, int len);
84 /* Sends an ICMP Echo request to destination IPv4 address */
85 extern void ping_ipv4(int fd, uint32_t _ping_dst_ip);
87 /* Returns host IPv4 address that we are waiting for a response */
88 extern uint32_t pong_ipv4(void);
90 /* Handles IPv4-packets that are detected by receive_ether. */
91 extern int8_t handle_ipv4(int fd, uint8_t * packet, uint32_t packetsize);
93 /* Handles ARP-packets that are detected by receive_ether. */
94 extern int8_t handle_arp(int fd, uint8_t * packet, uint32_t packetsize);