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annotate packages/redboot/current/src/net/ip.c @ 165:d63db767121d

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Merge from eCos master repository on 2001-06-29-06:43:03-BST
author jlarmour
date Fri, 29 Jun 2001 07:16:25 +0000
parents 6ed91473a1cd
children e0c0827131d1
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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 //==========================================================================
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8 //####COPYRIGHTBEGIN####
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9 //
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10 // -------------------------------------------
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11 // The contents of this file are subject to the Red Hat eCos Public License
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12 // Version 1.1 (the "License"); you may not use this file except in
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13 // compliance with the License. You may obtain a copy of the License at
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14 // http://www.redhat.com/
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15 //
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16 // Software distributed under the License is distributed on an "AS IS"
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17 // basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See the
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18 // License for the specific language governing rights and limitations under
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19 // the License.
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20 //
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21 // The Original Code is eCos - Embedded Configurable Operating System,
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22 // released September 30, 1998.
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23 //
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24 // The Initial Developer of the Original Code is Red Hat.
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25 // Portions created by Red Hat are
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26 // Copyright (C) 1998, 1999, 2000 Red Hat, Inc.
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27 // All Rights Reserved.
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28 // -------------------------------------------
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29 //
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30 //####COPYRIGHTEND####
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31 //==========================================================================
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32 //#####DESCRIPTIONBEGIN####
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33 //
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34 // Author(s): gthomas
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35 // Contributors: gthomas
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36 // Date: 2000-07-14
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37 // Purpose:
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38 // Description:
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39 //
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40 // This code is part of RedBoot (tm).
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41 //
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42 //####DESCRIPTIONEND####
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43 //
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44 //==========================================================================
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45
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46 #include <net/net.h>
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47
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48 #ifndef CYGDAT_REDBOOT_DEFAULT_IP_ADDR
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49 # define CYGDAT_REDBOOT_DEFAULT_IP_ADDR 0, 0, 0, 0
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50 #endif
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51
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52 ip_addr_t __local_ip_addr = { CYGDAT_REDBOOT_DEFAULT_IP_ADDR };
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53
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54 static word ip_ident;
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55
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56
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57 /*
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58 * Match given IP address to our address.
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59 * Check for broadcast matches as well.
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60 */
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61 static int
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62 ip_addr_match(ip_addr_t addr)
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63 {
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64 if (addr[0] == 255 && addr[1] == 255 && addr[2] == 255 && addr[3] == 255)
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65 return 1;
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66
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67 if (!memcmp(addr, __local_ip_addr, sizeof(ip_addr_t)))
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68 return 1;
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69
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70 /*
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71 * Consider it an address match if we haven't gotten our IP address yet.
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72 * Some DHCP servers will address IP packets to the assigned address
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73 * instead of a IP broadcast address.
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74 */
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75 if (__local_ip_addr[0] == 0 && __local_ip_addr[1] == 0 &&
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76 __local_ip_addr[2] == 0 && __local_ip_addr[3] == 0)
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77 return 1;
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78
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79 return 0;
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80 }
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81
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82
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83 extern void __tcp_handler(pktbuf_t *, ip_route_t *);
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84
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85 /*
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86 * Handle IP packets coming from the polled ethernet interface.
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87 */
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88 void
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89 __ip_handler(pktbuf_t *pkt, enet_addr_t *src_enet_addr)
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90 {
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91 ip_header_t *ip = pkt->ip_hdr;
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92 ip_route_t r;
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93 int hdr_bytes;
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94
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95 /* first make sure its ours and has a good checksum. */
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96 if (!ip_addr_match(ip->destination) ||
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97 __sum((word *)ip, ip->hdr_len << 2, 0) != 0) {
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98 __pktbuf_free(pkt);
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99 return;
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100 }
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101
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102 memcpy(r.ip_addr, ip->source, sizeof(ip_addr_t));
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103 memcpy(r.enet_addr, src_enet_addr, sizeof(enet_addr_t));
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104
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105 hdr_bytes = ip->hdr_len << 2;
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106 pkt->pkt_bytes = ntohs(ip->length) - hdr_bytes;
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107
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108 switch (ip->protocol) {
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109
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110 #if NET_SUPPORT_ICMP
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111 case IP_PROTO_ICMP:
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112 pkt->icmp_hdr = (icmp_header_t *)(((char *)ip) + hdr_bytes);
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113 __icmp_handler(pkt, &r);
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114 break;
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115 #endif
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116
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117 #if NET_SUPPORT_TCP
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118 case IP_PROTO_TCP:
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119 pkt->tcp_hdr = (tcp_header_t *)(((char *)ip) + hdr_bytes);
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120 __tcp_handler(pkt, &r);
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121 break;
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122 #endif
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123
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124 #if NET_SUPPORT_UDP
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125 case IP_PROTO_UDP:
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126 pkt->udp_hdr = (udp_header_t *)(((char *)ip) + hdr_bytes);
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127 __udp_handler(pkt, &r);
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128 break;
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129 #endif
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130
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131 default:
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132 __pktbuf_free(pkt);
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133 break;
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134 }
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135 }
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136
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137
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138 /*
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139 * Send an IP packet.
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140 *
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141 * The IP data field should contain pkt->pkt_bytes of data.
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142 * pkt->[udp|tcp|icmp]_hdr points to the IP data field. Any
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143 * IP options are assumed to be already in place in the IP
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144 * options field.
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145 */
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146 void
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147 __ip_send(pktbuf_t *pkt, int protocol, ip_route_t *dest)
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148 {
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149 ip_header_t *ip = pkt->ip_hdr;
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150 int hdr_bytes;
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151 unsigned short cksum;
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152
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153 /*
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154 * Figure out header length. The use udp_hdr is
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155 * somewhat arbitrary, but works because it is
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156 * a union with other IP protocol headers.
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157 */
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158 hdr_bytes = (((char *)pkt->udp_hdr) - ((char *)ip));
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159
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160 pkt->pkt_bytes += hdr_bytes;
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161
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162 ip->version = 4;
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163 ip->hdr_len = hdr_bytes >> 2;
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164 ip->tos = 0;
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165 ip->length = htons(pkt->pkt_bytes);
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166 ip->ident = htons(ip_ident);
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167 ip_ident++;
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168 ip->fragment = 0;
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169 ip->ttl = 255;
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170 ip->ttl = 64;
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171 ip->protocol = protocol;
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172 ip->checksum = 0;
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173 memcpy(ip->source, __local_ip_addr, sizeof(ip_addr_t));
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174 memcpy(ip->destination, dest->ip_addr, sizeof(ip_addr_t));
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175 cksum = __sum((word *)ip, hdr_bytes, 0);
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176 ip->checksum = htons(cksum);
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177
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178 __enet_send(pkt, &dest->enet_addr, ETH_TYPE_IP);
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179 }
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180
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181