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annotate packages/redboot/current/src/net/ip.c @ 115:6ed91473a1cd ecos-sw-2000-08-21

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Merge from eCos master repository on 2000-08-21-22:40:54-BST
author jlarmour
date Fri, 25 Aug 2000 17:32:38 +0000
parents
children d63db767121d
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115
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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 ip_addr_t __local_ip_addr = { 0, 0, 0, 0 };
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49
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50 static word ip_ident;
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51
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52
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53 /*
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54 * Match given IP address to our address.
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55 * Check for broadcast matches as well.
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56 */
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57 static int
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58 ip_addr_match(ip_addr_t addr)
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59 {
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60 if (addr[0] == 255 && addr[1] == 255 && addr[2] == 255 && addr[3] == 255)
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61 return 1;
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62
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63 if (!memcmp(addr, __local_ip_addr, sizeof(ip_addr_t)))
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64 return 1;
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65
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66 /*
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67 * Consider it an address match if we haven't gotten our IP address yet.
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68 * Some DHCP servers will address IP packets to the assigned address
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69 * instead of a IP broadcast address.
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70 */
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71 if (__local_ip_addr[0] == 0 && __local_ip_addr[1] == 0 &&
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72 __local_ip_addr[2] == 0 && __local_ip_addr[3] == 0)
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73 return 1;
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74
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75 return 0;
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76 }
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77
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78
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79 extern void __tcp_handler(pktbuf_t *, ip_route_t *);
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80
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81 /*
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82 * Handle IP packets coming from the polled ethernet interface.
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83 */
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84 void
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85 __ip_handler(pktbuf_t *pkt, enet_addr_t *src_enet_addr)
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86 {
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87 ip_header_t *ip = pkt->ip_hdr;
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88 ip_route_t r;
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89 int hdr_bytes;
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90
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91 /* first make sure its ours and has a good checksum. */
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92 if (!ip_addr_match(ip->destination) ||
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93 __sum((word *)ip, ip->hdr_len << 2, 0) != 0) {
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94 __pktbuf_free(pkt);
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95 return;
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96 }
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97
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98 memcpy(r.ip_addr, ip->source, sizeof(ip_addr_t));
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99 memcpy(r.enet_addr, src_enet_addr, sizeof(enet_addr_t));
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100
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101 hdr_bytes = ip->hdr_len << 2;
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102 pkt->pkt_bytes = ntohs(ip->length) - hdr_bytes;
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103
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104 switch (ip->protocol) {
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105
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106 #if NET_SUPPORT_ICMP
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107 case IP_PROTO_ICMP:
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108 pkt->icmp_hdr = (icmp_header_t *)(((char *)ip) + hdr_bytes);
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109 __icmp_handler(pkt, &r);
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110 break;
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111 #endif
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112
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113 #if NET_SUPPORT_TCP
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114 case IP_PROTO_TCP:
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115 pkt->tcp_hdr = (tcp_header_t *)(((char *)ip) + hdr_bytes);
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116 __tcp_handler(pkt, &r);
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117 break;
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118 #endif
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119
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120 #if NET_SUPPORT_UDP
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121 case IP_PROTO_UDP:
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122 pkt->udp_hdr = (udp_header_t *)(((char *)ip) + hdr_bytes);
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123 __udp_handler(pkt, &r);
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124 break;
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125 #endif
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126
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127 default:
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128 __pktbuf_free(pkt);
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129 break;
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130 }
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131 }
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132
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133
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134 /*
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135 * Send an IP packet.
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136 *
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137 * The IP data field should contain pkt->pkt_bytes of data.
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138 * pkt->[udp|tcp|icmp]_hdr points to the IP data field. Any
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139 * IP options are assumed to be already in place in the IP
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140 * options field.
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141 */
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142 void
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143 __ip_send(pktbuf_t *pkt, int protocol, ip_route_t *dest)
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144 {
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145 ip_header_t *ip = pkt->ip_hdr;
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146 int hdr_bytes;
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147 unsigned short cksum;
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148
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149 /*
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150 * Figure out header length. The use udp_hdr is
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151 * somewhat arbitrary, but works because it is
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152 * a union with other IP protocol headers.
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153 */
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154 hdr_bytes = (((char *)pkt->udp_hdr) - ((char *)ip));
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155
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156 pkt->pkt_bytes += hdr_bytes;
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157
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158 ip->version = 4;
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159 ip->hdr_len = hdr_bytes >> 2;
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160 ip->tos = 0;
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161 ip->length = htons(pkt->pkt_bytes);
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162 ip->ident = htons(ip_ident);
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163 ip_ident++;
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164 ip->fragment = 0;
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165 ip->ttl = 255;
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166 ip->ttl = 64;
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167 ip->protocol = protocol;
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168 ip->checksum = 0;
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169 memcpy(ip->source, __local_ip_addr, sizeof(ip_addr_t));
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170 memcpy(ip->destination, dest->ip_addr, sizeof(ip_addr_t));
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171 cksum = __sum((word *)ip, hdr_bytes, 0);
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172 ip->checksum = htons(cksum);
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173
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174 __enet_send(pkt, &dest->enet_addr, ETH_TYPE_IP);
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175 }
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176
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177