1 | //////////////////////////////////////////////////////////////////////////////// |
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2 | // Copyright (c) 2004 Xilinx, Inc. All rights reserved. |
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3 | // |
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4 | // Xilinx, Inc. |
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5 | // XILINX IS PROVIDING THIS DESIGN, CODE, OR INFORMATION "AS IS" AS A |
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6 | // COURTESY TO YOU. BY PROVIDING THIS DESIGN, CODE, OR INFORMATION AS |
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7 | // ONE POSSIBLE IMPLEMENTATION OF THIS FEATURE, APPLICATION OR |
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8 | // STANDARD, XILINX IS MAKING NO REPRESENTATION THAT THIS IMPLEMENTATION |
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9 | // IS FREE FROM ANY CLAIMS OF INFRINGEMENT, AND YOU ARE RESPONSIBLE |
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10 | // FOR OBTAINING ANY RIGHTS YOU MAY REQUIRE FOR YOUR IMPLEMENTATION. |
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11 | // XILINX EXPRESSLY DISCLAIMS ANY WARRANTY WHATSOEVER WITH RESPECT TO |
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12 | // THE ADEQUACY OF THE IMPLEMENTATION, INCLUDING BUT NOT LIMITED TO |
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13 | // ANY WARRANTIES OR REPRESENTATIONS THAT THIS IMPLEMENTATION IS FREE |
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14 | // FROM CLAIMS OF INFRINGEMENT, IMPLIED WARRANTIES OF MERCHANTABILITY |
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15 | // AND FITNESS FOR A PARTICULAR PURPOSE. |
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16 | // |
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17 | // File : ip.c |
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18 | // Date : 2002, March 20. |
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19 | // Author : Sathya Thammanur |
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20 | // Company: Xilinx |
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21 | // Group : Emerging Software Technologies |
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22 | // |
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23 | // Summary: |
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24 | // IP layer specific functions |
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25 | // |
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26 | // $Id: ip.c,v 1.2.8.6 2005/11/15 23:41:10 salindac Exp $ |
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27 | // |
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28 | //////////////////////////////////////////////////////////////////////////////// |
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29 | |
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30 | //////////////////////////////////////////////////////////////////////////////// |
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31 | // see copyright.txt for Rice University/Mango Communications modifications |
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32 | //////////////////////////////////////////////////////////////////////////////// |
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33 | |
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34 | #include <xilnet_xilsock.h> |
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35 | |
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36 | |
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37 | /* |
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38 | * initialize xilnet ip address |
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39 | */ |
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40 | void xilnet_ip_init(unsigned char* addr, unsigned int eth_dev_num) { |
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41 | int k = 0; |
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42 | int j; |
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43 | int sum = 0; |
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44 | |
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45 | for (j = 0; j < 3; j++) { |
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46 | |
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47 | // parse input for dotted decimal notation of ip address |
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48 | while(addr[k] != '.') { |
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49 | sum = sum * 10 + addr[k] - 48; |
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50 | k++; |
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51 | } |
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52 | |
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53 | k++; // move over the dot |
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54 | eth_device[eth_dev_num].node_ip_addr[j] = (unsigned char) sum; |
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55 | sum = 0; |
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56 | } |
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57 | |
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58 | // read last byte of ip address |
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59 | while (addr[k] != '\0') { |
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60 | sum = sum * 10 + addr[k] - 48; |
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61 | k++; |
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62 | } |
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63 | eth_device[eth_dev_num].node_ip_addr[3] = (unsigned char) sum; |
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64 | } |
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65 | |
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66 | |
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67 | /* |
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68 | * ip datagram handler: |
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69 | * checks for the source ip address and calls the corr protocol handler |
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70 | * no checksum calc is done to detect any errors |
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71 | */ |
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72 | |
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73 | int xilnet_ip(unsigned char*buf, int len, unsigned int eth_dev_num) { |
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74 | |
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75 | int iplen = 0; |
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76 | struct xilnet_ip_hdr *iph = (struct xilnet_ip_hdr *) (buf+ETH_HDR_LEN); |
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77 | |
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78 | #ifdef _DEBUG_ |
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79 | xil_printf("BEGIN xilnet_ip(): \n"); |
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80 | xil_printf(" Packet IP Address: %d.%d.%d.%d \n", (buf+ETH_HDR_LEN)[IP_DADDR_BASE], (buf+ETH_HDR_LEN)[IP_DADDR_BASE+1], |
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81 | (buf+ETH_HDR_LEN)[IP_DADDR_BASE+2], (buf+ETH_HDR_LEN)[IP_DADDR_BASE+3]); |
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82 | xil_printf(" Device IP Address: %d.%d.%d.%d \n", eth_device[eth_dev_num].node_ip_addr[0], eth_device[eth_dev_num].node_ip_addr[1], |
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83 | eth_device[eth_dev_num].node_ip_addr[2], eth_device[eth_dev_num].node_ip_addr[3]); |
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84 | #endif |
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85 | |
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86 | unsigned char * ip_hdr = (unsigned char *) buf + ETH_HDR_LEN; |
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87 | unsigned char addr_pass = 0; |
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88 | |
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89 | // If the node has not been initialized (ie address is 10.0.0.0) |
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90 | if ( eth_device[eth_dev_num].node_ip_addr[3] == 0 ) { |
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91 | |
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92 | // Accept broadcast packets from 10.0.X.255 |
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93 | if ( ip_hdr[IP_DADDR_BASE] == eth_device[eth_dev_num].node_ip_addr[0] && |
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94 | ip_hdr[IP_DADDR_BASE+1] == eth_device[eth_dev_num].node_ip_addr[1] && |
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95 | ip_hdr[IP_DADDR_BASE+3] == 255 ) { |
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96 | |
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97 | addr_pass = 1; |
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98 | } |
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99 | } else { |
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100 | // Accept unicast packets and broadcast packets on the given subnet |
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101 | if ( ip_hdr[IP_DADDR_BASE] == eth_device[eth_dev_num].node_ip_addr[0] && |
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102 | ip_hdr[IP_DADDR_BASE+1] == eth_device[eth_dev_num].node_ip_addr[1] && |
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103 | ip_hdr[IP_DADDR_BASE+2] == eth_device[eth_dev_num].node_ip_addr[2] && |
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104 | (ip_hdr[IP_DADDR_BASE+3] == eth_device[eth_dev_num].node_ip_addr[3] || ip_hdr[IP_DADDR_BASE+3] == 255 )) { |
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105 | |
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106 | addr_pass = 1; |
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107 | } |
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108 | } |
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109 | |
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110 | if (addr_pass == 1) { |
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111 | |
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112 | // update hw addr table |
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113 | xilnet_eth_update_hw_tbl(buf, ETH_PROTO_IP, eth_dev_num); |
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114 | |
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115 | iplen = (unsigned short)( ((((unsigned short)buf[ETH_HDR_LEN+2]) << 8) & 0xFF00) + |
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116 | (((unsigned short)buf[ETH_HDR_LEN+3]) & 0x00FF) ); |
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117 | |
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118 | #ifdef _DEBUG_ |
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119 | xil_printf(" IP protocol: %d \n", iph->prot); |
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120 | #endif |
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121 | |
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122 | // call corr protocol handler with the ip datagram |
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123 | switch (iph->prot) { |
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124 | case IP_PROTO_UDP: |
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125 | return (xilnet_udp(buf+ETH_HDR_LEN, iplen, eth_dev_num)); |
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126 | break; |
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127 | case IP_PROTO_TCP: |
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128 | xil_printf("Error: Xilnet does not support TCP \n"); |
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129 | return 0; |
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130 | break; |
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131 | case IP_PROTO_ICMP: |
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132 | return (xilnet_icmp(buf+ETH_HDR_LEN, iplen, eth_dev_num)); |
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133 | break; |
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134 | default: |
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135 | xil_printf("Error: unknown IP protocol \n"); |
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136 | return 0; |
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137 | break; |
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138 | } |
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139 | } |
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140 | |
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141 | #ifdef _DEBUG_ |
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142 | xil_printf("END xilnet_ip(): \n"); |
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143 | #endif |
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144 | |
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145 | return 0; |
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146 | } |
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147 | |
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148 | |
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149 | /* |
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150 | * xilnet_ip_header: fills in the ip header for proto |
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151 | */ |
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152 | int ip_id_cnt = 0; |
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153 | |
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154 | void xilnet_ip_header(unsigned char* buf, int len, int proto, unsigned char *peer_ip_addr, unsigned int eth_dev_num) { |
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155 | |
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156 | struct xilnet_ip_hdr *iph = (struct xilnet_ip_hdr*) buf; |
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157 | |
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158 | #ifdef _DEBUG_ |
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159 | xil_printf("In xilnet_ip_header(): \n"); |
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160 | #endif |
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161 | |
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162 | buf[0] = IP_VERSION << 4; |
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163 | buf[0] |= IP_HDR_LEN; |
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164 | iph->tos = IP_TOS; |
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165 | iph->total_len = Xil_Htons(len); |
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166 | iph->ident = Xil_Htons(ip_id_cnt++); |
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167 | iph->frag_off = Xil_Htons(IP_FRAG_OFF); |
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168 | iph->ttl = IP_TTL; |
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169 | iph->prot = proto; |
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170 | iph->check_sum = 0; |
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171 | buf[IP_SADDR_BASE] = eth_device[eth_dev_num].node_ip_addr[0]; |
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172 | buf[IP_SADDR_BASE+1] = eth_device[eth_dev_num].node_ip_addr[1]; |
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173 | buf[IP_SADDR_BASE+2] = eth_device[eth_dev_num].node_ip_addr[2]; |
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174 | buf[IP_SADDR_BASE+3] = eth_device[eth_dev_num].node_ip_addr[3]; |
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175 | buf[IP_DADDR_BASE] = peer_ip_addr[0]; |
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176 | buf[IP_DADDR_BASE+1] = peer_ip_addr[1]; |
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177 | buf[IP_DADDR_BASE+2] = peer_ip_addr[2]; |
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178 | buf[IP_DADDR_BASE+3] = peer_ip_addr[3]; |
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179 | iph->check_sum = Xil_Htons(xilnet_ip_calc_chksum(buf, IP_HDR_LEN*4)); |
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180 | |
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181 | } |
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182 | |
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183 | |
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184 | /* |
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185 | * xilnet_ip_calc_chksum: compute checksum for ip header |
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186 | */ |
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187 | |
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188 | unsigned short xilnet_ip_calc_chksum(unsigned char* buf, int len) { |
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189 | |
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190 | unsigned int sum = 0; |
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191 | unsigned short w16 = 0; |
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192 | int i; |
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193 | |
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194 | for (i = 0; i < len; i = i + 2) { |
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195 | w16 = ((buf[i] << 8) & 0xFF00) + (buf[i+1] & 0x00FF); |
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196 | sum = sum + (unsigned int) w16; |
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197 | } |
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198 | |
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199 | while (sum >> 16) |
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200 | sum = (sum & 0xFFFF) + (sum >> 16); |
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201 | |
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202 | return (unsigned short) (~sum); |
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203 | } |
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