Annotation of sys/arch/mvme68k/stand/sboot/etherfun.h, Revision 1.1
1.1 ! nbrk 1: /* $OpenBSD: etherfun.h,v 1.2 1996/04/28 10:49:37 deraadt Exp $ */
! 2:
! 3: /*
! 4: *
! 5: * Copyright (c) 1995 Charles D. Cranor and Seth Widoff
! 6: * All rights reserved.
! 7: *
! 8: * Redistribution and use in source and binary forms, with or without
! 9: * modification, are permitted provided that the following conditions
! 10: * are met:
! 11: * 1. Redistributions of source code must retain the above copyright
! 12: * notice, this list of conditions and the following disclaimer.
! 13: * 2. Redistributions in binary form must reproduce the above copyright
! 14: * notice, this list of conditions and the following disclaimer in the
! 15: * documentation and/or other materials provided with the distribution.
! 16: * 3. All advertising materials mentioning features or use of this software
! 17: * must display the following acknowledgement:
! 18: * This product includes software developed by Charles D. Cranor
! 19: * and Seth Widoff.
! 20: * 4. The name of the author may not be used to endorse or promote products
! 21: * derived from this software without specific prior written permission.
! 22: *
! 23: * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
! 24: * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
! 25: * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
! 26: * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
! 27: * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
! 28: * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
! 29: * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
! 30: * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
! 31: * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
! 32: * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
! 33: */
! 34: /* etherfun.h */
! 35:
! 36: /* constants */
! 37: /* ether header */
! 38: #define ETYPE_RARP 0x8035 /* ethertype is RARP */
! 39: #define ETYPE_IP 0x800 /* ethertype is IP */
! 40:
! 41: /* rev arp */
! 42: #define PTYPE_IP 0x800 /* Protocol type is IP */
! 43: #define OPCODE_RARP 3 /* Optype is REVARP request */
! 44: #define OPCODE_REPLY 4 /* Optype is REVARP reply */
! 45:
! 46: /* ip header */
! 47: #define IPP_UDP 17 /* IP Protocol is UDP */
! 48: #define IP_VERSION 4 /* IP version number */
! 49: #define IP_HLEN 5 /* IP header length is a fixed 50 bytes */
! 50: #define N 1536
! 51:
! 52: /* tftp header */
! 53: #define FTPOP_ACKN 4 /* Opcode is acknowledge */
! 54: #define FTPOP_ERR 5 /* Opcode is Error */
! 55: #define FTP_PORT 69 /* Standard TFTP port number */
! 56: #define MSG "\0\1xxxxxxxx.mvme68k\0octet\0" /* implicit NULL */
! 57:
! 58: /* data structures */
! 59:
! 60: struct ether_header {
! 61: u_char ether_dhost[6];
! 62: u_char ether_shost[6];
! 63: u_short ether_type;
! 64: };
! 65:
! 66: struct ether_arp {
! 67: u_short ar_hrd; /* format of hardware address */
! 68: u_short ar_pro; /* format of protocol address */
! 69: u_char ar_hln; /* length of hardware address */
! 70: u_char ar_pln; /* length of protocol address */
! 71: u_short ar_op;
! 72: u_char arp_sha[6]; /* sender hardware address */
! 73: u_char arp_spa[4]; /* sender protocol address */
! 74: u_char arp_tha[6]; /* target hardware address */
! 75: u_char arp_tpa[4]; /* target protocol address */
! 76: };
! 77:
! 78: struct ip {
! 79: u_char ip_v:4, /* version */
! 80: ip_hl:4; /* header length */
! 81: u_char ip_tos; /* type of service */
! 82: short ip_len; /* total length */
! 83: u_short ip_id; /* identification */
! 84: short ip_off; /* fragment offset field */
! 85: #define IP_DF 0x4000 /* dont fragment flag */
! 86: #define IP_MF 0x2000 /* more fragments flag */
! 87: #define IP_OFFMASK 0x1fff /* mask for fragmenting bits */
! 88: u_char ip_ttl; /* time to live */
! 89: u_char ip_p; /* protocol */
! 90: u_short ip_sum; /* checksum */
! 91: u_char ip_src[4];
! 92: u_char ip_dst[4]; /* source and dest address */
! 93: };
! 94:
! 95: struct udp {
! 96: u_short uh_sport;
! 97: u_short uh_dport;
! 98: short uh_ulen;
! 99: u_short uh_sum;
! 100: };
! 101:
! 102: struct tftph {
! 103: u_short op_code;
! 104: u_short block;
! 105: };
! 106:
! 107: struct tftphr {
! 108: struct tftph info;
! 109: char data[1];
! 110: };
! 111:
! 112: /* globals */
! 113: int last_ack;
! 114: char buf[N];
! 115: struct ether_header *eh = (struct ether_header *)buf;
! 116: struct ether_arp *rarp = (struct ether_arp *)
! 117: (buf + sizeof(struct ether_header));
! 118: struct ip *iph = (struct ip *)(buf + sizeof(struct ether_header));
! 119: struct udp *udph = (struct udp *)
! 120: (buf + sizeof(struct ether_header) + sizeof(struct ip));
! 121: char *tftp_r = buf + sizeof(struct ether_header) + sizeof(struct ip) +
! 122: sizeof(struct udp);
! 123: struct tftph *tftp_a = (struct tftph *)(buf + sizeof(struct ether_header) +
! 124: sizeof(struct ip) + sizeof(struct udp));
! 125: struct tftphr *tftp = (struct tftphr *)(buf + sizeof(struct ether_header) +
! 126: sizeof(struct ip) + sizeof(struct udp));
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