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annotate packages/redboot/current/src/net/ip.c @ 210:d2c90368aeef

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Merge from eCos master repository on 2002-05-23-21:39:14-BST
author jlarmour
date Thu, 23 May 2002 22:59:51 +0000
parents e0c0827131d1
children 4ebdd3788c30
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1 //==========================================================================
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2 //
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3 // net/ip.c
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4 //
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5 // Stand-alone IP networking support for RedBoot
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6 //
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7 //==========================================================================
208
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8 //####ECOSGPLCOPYRIGHTBEGIN####
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9 // -------------------------------------------
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10 // This file is part of eCos, the Embedded Configurable Operating System.
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11 // Copyright (C) 1998, 1999, 2000, 2001, 2002 Red Hat, Inc.
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12 //
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13 // eCos is free software; you can redistribute it and/or modify it under
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14 // the terms of the GNU General Public License as published by the Free
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15 // Software Foundation; either version 2 or (at your option) any later version.
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16 //
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17 // eCos is distributed in the hope that it will be useful, but WITHOUT ANY
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18 // WARRANTY; without even the implied warranty of MERCHANTABILITY or
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19 // FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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20 // for more details.
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21 //
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22 // You should have received a copy of the GNU General Public License along
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23 // with eCos; if not, write to the Free Software Foundation, Inc.,
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24 // 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
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25 //
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26 // As a special exception, if other files instantiate templates or use macros
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27 // or inline functions from this file, or you compile this file and link it
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28 // with other works to produce a work based on this file, this file does not
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29 // by itself cause the resulting work to be covered by the GNU General Public
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30 // License. However the source code for this file must still be made available
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31 // in accordance with section (3) of the GNU General Public License.
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32 //
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33 // This exception does not invalidate any other reasons why a work based on
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34 // this file might be covered by the GNU General Public License.
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35 //
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36 // Alternative licenses for eCos may be arranged by contacting Red Hat, Inc.
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37 // at http://sources.redhat.com/ecos/ecos-license/
208
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38 // -------------------------------------------
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39 //####ECOSGPLCOPYRIGHTEND####
115
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40 //==========================================================================
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41 //#####DESCRIPTIONBEGIN####
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42 //
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43 // Author(s): gthomas
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44 // Contributors: gthomas
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45 // Date: 2000-07-14
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46 // Purpose:
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47 // Description:
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48 //
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49 // This code is part of RedBoot (tm).
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50 //
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51 //####DESCRIPTIONEND####
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52 //
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53 //==========================================================================
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54
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55 #include <net/net.h>
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56
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57 #ifndef CYGDAT_REDBOOT_DEFAULT_IP_ADDR
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58 # define CYGDAT_REDBOOT_DEFAULT_IP_ADDR 0, 0, 0, 0
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59 #endif
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60
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61 ip_addr_t __local_ip_addr = { CYGDAT_REDBOOT_DEFAULT_IP_ADDR };
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62
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63 static word ip_ident;
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64
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65
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66 /*
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67 * Match given IP address to our address.
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68 * Check for broadcast matches as well.
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69 */
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70 static int
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71 ip_addr_match(ip_addr_t addr)
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72 {
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73 if (addr[0] == 255 && addr[1] == 255 && addr[2] == 255 && addr[3] == 255)
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74 return 1;
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75
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76 if (!memcmp(addr, __local_ip_addr, sizeof(ip_addr_t)))
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77 return 1;
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78
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79 /*
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80 * Consider it an address match if we haven't gotten our IP address yet.
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81 * Some DHCP servers will address IP packets to the assigned address
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82 * instead of a IP broadcast address.
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83 */
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84 if (__local_ip_addr[0] == 0 && __local_ip_addr[1] == 0 &&
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85 __local_ip_addr[2] == 0 && __local_ip_addr[3] == 0)
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86 return 1;
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87
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88 return 0;
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89 }
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90
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91
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92 extern void __tcp_handler(pktbuf_t *, ip_route_t *);
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93
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94 /*
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95 * Handle IP packets coming from the polled ethernet interface.
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96 */
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97 void
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98 __ip_handler(pktbuf_t *pkt, enet_addr_t *src_enet_addr)
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99 {
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100 ip_header_t *ip = pkt->ip_hdr;
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101 ip_route_t r;
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102 int hdr_bytes;
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103
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104 /* first make sure its ours and has a good checksum. */
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105 if (!ip_addr_match(ip->destination) ||
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106 __sum((word *)ip, ip->hdr_len << 2, 0) != 0) {
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107 __pktbuf_free(pkt);
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108 return;
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109 }
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110
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111 memcpy(r.ip_addr, ip->source, sizeof(ip_addr_t));
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112 memcpy(r.enet_addr, src_enet_addr, sizeof(enet_addr_t));
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113
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114 hdr_bytes = ip->hdr_len << 2;
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115 pkt->pkt_bytes = ntohs(ip->length) - hdr_bytes;
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116
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117 switch (ip->protocol) {
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118
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119 #if NET_SUPPORT_ICMP
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120 case IP_PROTO_ICMP:
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121 pkt->icmp_hdr = (icmp_header_t *)(((char *)ip) + hdr_bytes);
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122 __icmp_handler(pkt, &r);
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123 break;
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124 #endif
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125
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126 #if NET_SUPPORT_TCP
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127 case IP_PROTO_TCP:
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128 pkt->tcp_hdr = (tcp_header_t *)(((char *)ip) + hdr_bytes);
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129 __tcp_handler(pkt, &r);
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130 break;
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131 #endif
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132
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133 #if NET_SUPPORT_UDP
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134 case IP_PROTO_UDP:
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135 pkt->udp_hdr = (udp_header_t *)(((char *)ip) + hdr_bytes);
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136 __udp_handler(pkt, &r);
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137 break;
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138 #endif
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139
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140 default:
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141 __pktbuf_free(pkt);
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142 break;
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143 }
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144 }
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145
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146
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147 /*
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148 * Send an IP packet.
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149 *
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150 * The IP data field should contain pkt->pkt_bytes of data.
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151 * pkt->[udp|tcp|icmp]_hdr points to the IP data field. Any
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152 * IP options are assumed to be already in place in the IP
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153 * options field.
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154 */
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155 void
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156 __ip_send(pktbuf_t *pkt, int protocol, ip_route_t *dest)
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157 {
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158 ip_header_t *ip = pkt->ip_hdr;
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159 int hdr_bytes;
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160 unsigned short cksum;
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161
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162 /*
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163 * Figure out header length. The use udp_hdr is
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164 * somewhat arbitrary, but works because it is
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165 * a union with other IP protocol headers.
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166 */
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167 hdr_bytes = (((char *)pkt->udp_hdr) - ((char *)ip));
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168
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169 pkt->pkt_bytes += hdr_bytes;
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170
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171 ip->version = 4;
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172 ip->hdr_len = hdr_bytes >> 2;
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173 ip->tos = 0;
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174 ip->length = htons(pkt->pkt_bytes);
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175 ip->ident = htons(ip_ident);
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176 ip_ident++;
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177 ip->fragment = 0;
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178 ip->ttl = 255;
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179 ip->ttl = 64;
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180 ip->protocol = protocol;
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181 ip->checksum = 0;
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182 memcpy(ip->source, __local_ip_addr, sizeof(ip_addr_t));
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183 memcpy(ip->destination, dest->ip_addr, sizeof(ip_addr_t));
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184 cksum = __sum((word *)ip, hdr_bytes, 0);
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185 ip->checksum = htons(cksum);
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186
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187 __enet_send(pkt, &dest->enet_addr, ETH_TYPE_IP);
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188 }
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189
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190