1/*	$NetBSD: etherfun.h,v 1.4 2008/01/12 09:54:33 tsutsui Exp $	*/
2
3/*
4 * Copyright (c) 1995 Charles D. Cranor and Seth Widoff
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 *    notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 *    notice, this list of conditions and the following disclaimer in the
14 *    documentation and/or other materials provided with the distribution.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
17 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
18 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
19 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
20 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
21 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
22 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
23 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
24 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
25 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
26 */
27/* etherfun.h */
28
29/* constants */
30/* ether header */
31#define ETYPE_RARP 0x8035  /* ethertype is RARP */
32#define ETYPE_IP   0x800   /* ethertype is IP   */
33
34/* rev arp */
35#define PTYPE_IP 0x800     /* Protocol type is IP      */
36#define OPCODE_RARP 3      /* Optype is REVARP request */
37#define OPCODE_REPLY 4     /* Optype is REVARP reply   */
38
39/* ip header */
40#define  IPP_UDP 17        /* IP Protocol is UDP       */
41#define  IP_VERSION 4      /* IP version number        */
42#define  IP_HLEN 5         /* IP header length is a fixed 50 bytes */
43#define N 1536
44
45/* tftp header */
46#define FTPOP_ACKN 4      /* Opcode is acknowledge     */
47#define FTPOP_ERR 5       /* Opcode is Error	       */
48#define FTP_PORT 69       /* Standard TFTP port number */
49#define MSG "\0\1xxxxxxxx.147\0octet\0" /* implicit NULL */
50
51/* data structures */
52
53struct  ether_header {
54	u_char  ether_dhost[6];
55	u_char  ether_shost[6];
56	u_short ether_type;
57};
58
59struct  ether_arp {
60	u_short ar_hrd;		/* format of hardware address */
61	u_short ar_pro;		/* format of protocol address */
62	u_char  ar_hln;		/* length of hardware address */
63	u_char  ar_pln;		/* length of protocol address */
64	u_short ar_op;
65	u_char  arp_sha[6];	/* sender hardware address */
66	u_char  arp_spa[4];	/* sender protocol address */
67	u_char  arp_tha[6];	/* target hardware address */
68	u_char  arp_tpa[4];	/* target protocol address */
69};
70
71struct ip {
72	u_char  ip_v:4,			/* version */
73		ip_hl:4;		/* header length */
74	u_char  ip_tos;			/* type of service */
75	short   ip_len;			/* total length */
76	u_short ip_id;			/* identification */
77	short   ip_off;			/* fragment offset field */
78#define IP_DF 0x4000			/* dont fragment flag */
79#define IP_MF 0x2000			/* more fragments flag */
80#define IP_OFFMASK 0x1fff		/* mask for fragmenting bits */
81	u_char  ip_ttl;			/* time to live */
82	u_char  ip_p;			/* protocol */
83	u_short ip_sum;			/* checksum */
84	u_char  ip_src[4];
85	u_char  ip_dst[4];		/* source and dest address */
86};
87
88struct udp {
89	u_short uh_sport;
90	u_short uh_dport;
91	short uh_ulen;
92	u_short uh_sum;
93};
94
95struct tftph {
96	u_short op_code;
97	u_short block;
98};
99
100struct tftphr {
101	struct tftph info;
102	char data[1];
103};
104
105/* globals */
106int last_ack;
107u_char buf[N];
108struct ether_header *eh = (struct ether_header *)buf;
109struct ether_arp *rarp =
110    (struct ether_arp *)(buf + sizeof(struct ether_header));
111struct ip *iph = (struct ip *)(buf + sizeof(struct ether_header));
112struct udp *udph = (struct udp *)(buf + sizeof(struct ether_header) +
113    sizeof(struct ip));
114u_char *tftp_r = buf + sizeof(struct ether_header) + sizeof(struct ip) +
115    sizeof(struct udp);
116struct tftph *tftp_a = (struct tftph *)(buf + sizeof(struct ether_header) +
117    sizeof(struct ip) + sizeof(struct udp));
118struct tftphr *tftp = (struct tftphr *)(buf + sizeof(struct ether_header) +
119    sizeof(struct ip) + sizeof(struct udp));
120