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annotate packages/redboot/current/src/net/ip.c @ 3292:7f8e529b4d82 default tip

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Fix FREESCALE_EDMA_NBYTES_MLOFFYES_MLOFF() so it works with negative offsets.
author vae
date Wed, 29 Apr 2015 23:31:48 +0000
parents 74dbf4c3f2e1
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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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 // ####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 Free Software Foundation, 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
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16 // version.
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17 //
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18 // eCos is distributed in the hope that it will be useful, but WITHOUT
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19 // ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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20 // FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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21 // for more details.
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22 //
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23 // You should have received a copy of the GNU General Public License
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24 // along with eCos; if not, write to the Free Software Foundation, Inc.,
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25 // 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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26 //
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27 // As a special exception, if other files instantiate templates or use
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28 // macros or inline functions from this file, or you compile this file
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29 // and link it with other works to produce a work based on this file,
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30 // this file does not by itself cause the resulting work to be covered by
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31 // the GNU General Public License. However the source code for this file
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32 // must still be made available in accordance with section (3) of the GNU
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33 // General Public License v2.
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34 //
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35 // This exception does not invalidate any other reasons why a work based
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36 // on this file might be covered by the GNU General Public License.
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37 // -------------------------------------------
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38 // ####ECOSGPLCOPYRIGHTEND####
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39 //==========================================================================
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40 //#####DESCRIPTIONBEGIN####
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41 //
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42 // Author(s): gthomas
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43 // Contributors: gthomas
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44 // Date: 2000-07-14
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45 // Purpose:
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46 // Description:
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47 //
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48 // This code is part of RedBoot (tm).
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49 //
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50 //####DESCRIPTIONEND####
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51 //
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52 //==========================================================================
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53
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54 #include <net/net.h>
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55
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56 #ifndef CYGDAT_REDBOOT_DEFAULT_IP_ADDR
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57 # define CYGDAT_REDBOOT_DEFAULT_IP_ADDR 0, 0, 0, 0
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58 #endif
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59 #ifndef CYGDAT_REDBOOT_DEFAULT_IP_ADDR_MASK
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60 # define CYGDAT_REDBOOT_DEFAULT_IP_ADDR_MASK 255, 255, 255, 0
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61 #endif
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62 #ifndef CYGDAT_REDBOOT_DEFAULT_GATEWAY_IP_ADDR
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63 # define CYGDAT_REDBOOT_DEFAULT_GATEWAY_IP_ADDR 0, 0, 0, 0
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64 #endif
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65
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66 ip_addr_t __local_ip_addr = { CYGDAT_REDBOOT_DEFAULT_IP_ADDR };
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67 #ifdef CYGSEM_REDBOOT_NETWORKING_USE_GATEWAY
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68 ip_addr_t __local_ip_mask = { CYGDAT_REDBOOT_DEFAULT_IP_ADDR_MASK };
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69 ip_addr_t __local_ip_gate = { CYGDAT_REDBOOT_DEFAULT_GATEWAY_IP_ADDR };
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70 #endif
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71
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72 static word ip_ident;
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73
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74 #ifdef CYGSEM_REDBOOT_NETWORKING_USE_GATEWAY
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75 /*
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76 * See if an address is on the local network
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77 */
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78 int
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79 __ip_addr_local(ip_addr_t *addr)
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80 {
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81 return !(
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82 ((__local_ip_addr[0] ^ (*addr)[0]) & __local_ip_mask[0]) |
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83 ((__local_ip_addr[1] ^ (*addr)[1]) & __local_ip_mask[1]) |
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84 ((__local_ip_addr[2] ^ (*addr)[2]) & __local_ip_mask[2]) |
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85 ((__local_ip_addr[3] ^ (*addr)[3]) & __local_ip_mask[3]));
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86 }
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87 #endif
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88
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89 /*
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90 * Match given IP address to our address.
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91 * Check for broadcast matches as well.
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92 */
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93 static int
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94 ip_addr_match(ip_addr_t addr)
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95 {
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96 if (addr[0] == 255 && addr[1] == 255 && addr[2] == 255 && addr[3] == 255)
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97 return 1;
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98
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99 if (!memcmp(addr, __local_ip_addr, sizeof(ip_addr_t)))
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100 return 1;
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101
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102 /*
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103 * Consider it an address match if we haven't gotten our IP address yet.
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104 * Some DHCP servers will address IP packets to the assigned address
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105 * instead of a IP broadcast address.
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106 */
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107 if (__local_ip_addr[0] == 0 && __local_ip_addr[1] == 0 &&
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108 __local_ip_addr[2] == 0 && __local_ip_addr[3] == 0)
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109 return 1;
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110
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111 return 0;
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112 }
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113
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114
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115 extern void __tcp_handler(pktbuf_t *, ip_route_t *);
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116
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117 /*
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118 * Handle IP packets coming from the polled ethernet interface.
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119 */
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120 void
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121 __ip_handler(pktbuf_t *pkt, enet_addr_t *src_enet_addr)
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122 {
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123 ip_header_t *ip = pkt->ip_hdr;
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124 ip_route_t r;
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125 int hdr_bytes;
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126
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127 /* first make sure its ours and has a good checksum. */
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128 if (!ip_addr_match(ip->destination) ||
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129 __sum((word *)ip, ip->hdr_len << 2, 0) != 0) {
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130 __pktbuf_free(pkt);
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131 return;
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132 }
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133
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134 memcpy(r.ip_addr, ip->source, sizeof(ip_addr_t));
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135 memcpy(r.enet_addr, src_enet_addr, sizeof(enet_addr_t));
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136
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137 hdr_bytes = ip->hdr_len << 2;
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138 pkt->pkt_bytes = ntohs(ip->length) - hdr_bytes;
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139
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140 switch (ip->protocol) {
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141
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142 #if NET_SUPPORT_ICMP
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143 case IP_PROTO_ICMP:
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144 pkt->icmp_hdr = (icmp_header_t *)(((char *)ip) + hdr_bytes);
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145 __icmp_handler(pkt, &r);
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146 break;
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147 #endif
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148
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149 #if NET_SUPPORT_TCP
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150 case IP_PROTO_TCP:
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151 pkt->tcp_hdr = (tcp_header_t *)(((char *)ip) + hdr_bytes);
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152 __tcp_handler(pkt, &r);
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153 break;
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154 #endif
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155
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156 #if NET_SUPPORT_UDP
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157 case IP_PROTO_UDP:
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158 pkt->udp_hdr = (udp_header_t *)(((char *)ip) + hdr_bytes);
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159 __udp_handler(pkt, &r);
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160 break;
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161 #endif
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162
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163 default:
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164 __pktbuf_free(pkt);
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165 break;
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166 }
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167 }
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168
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169
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170 /*
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171 * Send an IP packet.
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172 *
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173 * The IP data field should contain pkt->pkt_bytes of data.
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174 * pkt->[udp|tcp|icmp]_hdr points to the IP data field. Any
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175 * IP options are assumed to be already in place in the IP
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176 * options field.
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177 */
231
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178 int
115
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179 __ip_send(pktbuf_t *pkt, int protocol, ip_route_t *dest)
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180 {
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181 ip_header_t *ip = pkt->ip_hdr;
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182 int hdr_bytes;
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183 unsigned short cksum;
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184
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185 /*
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186 * Figure out header length. The use udp_hdr is
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187 * somewhat arbitrary, but works because it is
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188 * a union with other IP protocol headers.
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189 */
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190 hdr_bytes = (((char *)pkt->udp_hdr) - ((char *)ip));
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191
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192 pkt->pkt_bytes += hdr_bytes;
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193
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194 ip->version = 4;
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195 ip->hdr_len = hdr_bytes >> 2;
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196 ip->tos = 0;
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197 ip->length = htons(pkt->pkt_bytes);
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198 ip->ident = htons(ip_ident);
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199 ip_ident++;
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200 ip->fragment = 0;
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201 ip->ttl = 255;
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202 ip->ttl = 64;
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203 ip->protocol = protocol;
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204 ip->checksum = 0;
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205 memcpy(ip->source, __local_ip_addr, sizeof(ip_addr_t));
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206 memcpy(ip->destination, dest->ip_addr, sizeof(ip_addr_t));
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207 cksum = __sum((word *)ip, hdr_bytes, 0);
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208 ip->checksum = htons(cksum);
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209
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210 __enet_send(pkt, &dest->enet_addr, ETH_TYPE_IP);
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211 return 0;
115
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212 }
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213
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214