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1 | 6 | kaklik | /*! \file net.h \brief Network support library. */ |
2 | //***************************************************************************** |
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3 | // |
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4 | // File Name : 'net.h' |
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5 | // Title : Network support library |
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6 | // Author : Pascal Stang |
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7 | // Created : 8/30/2004 |
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8 | // Revised : 7/3/2005 |
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9 | // Version : 0.1 |
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10 | // Target MCU : Atmel AVR series |
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11 | // Editor Tabs : 4 |
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12 | // |
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13 | /// \ingroup network |
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14 | /// \defgroup net Network support library (net.c) |
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15 | /// \code #include "net/net.h" \endcode |
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16 | /// \par Description |
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17 | /// This is a general network support library including a multitude of |
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18 | /// structure definitions for various types of network packets, functions |
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19 | /// and macros for switching byte order, and an RFC-compliant function |
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20 | /// for calculating checksums. |
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21 | // |
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22 | // This code is distributed under the GNU Public License |
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23 | // which can be found at http://www.gnu.org/licenses/gpl.txt |
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24 | //***************************************************************************** |
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25 | //@{ |
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26 | |||
27 | #ifndef NET_H |
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28 | #define NET_H |
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29 | |||
30 | #include <inttypes.h> |
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31 | #include "global.h" |
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32 | |||
33 | // Representation of a 48-bit Ethernet address. |
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34 | struct netEthAddr |
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35 | { |
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36 | uint8_t addr[6]; |
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37 | } GNUC_PACKED; |
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38 | |||
39 | // The Ethernet header |
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40 | struct netEthHeader |
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41 | { |
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42 | struct netEthAddr dest; |
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43 | struct netEthAddr src; |
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44 | uint16_t type; |
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45 | } GNUC_PACKED; |
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46 | |||
47 | #define ETH_HEADER_LEN 14 |
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48 | |||
49 | #define ETHTYPE_ARP 0x0806 |
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50 | #define ETHTYPE_IP 0x0800 |
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51 | #define ETHTYPE_IP6 0x86dd |
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52 | |||
53 | // The ARP header |
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54 | struct netArpHeader |
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55 | { |
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56 | uint16_t hwtype; |
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57 | uint16_t protocol; |
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58 | uint8_t hwlen; |
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59 | uint8_t protolen; |
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60 | uint16_t opcode; |
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61 | struct netEthAddr shwaddr; |
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62 | uint32_t sipaddr; |
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63 | struct netEthAddr dhwaddr; |
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64 | uint32_t dipaddr; |
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65 | } GNUC_PACKED; |
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66 | |||
67 | #define ARP_OPCODE_REQUEST 1 |
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68 | #define ARP_OPCODE_REPLY 2 |
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69 | #define ARP_HWTYPE_ETH 1 |
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70 | |||
71 | // The IP header |
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72 | struct netIpHeader |
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73 | { |
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74 | uint8_t vhl; |
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75 | uint8_t tos; |
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76 | uint16_t len; |
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77 | uint16_t ipid; |
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78 | uint16_t ipoffset; |
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79 | uint8_t ttl; |
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80 | uint8_t proto; |
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81 | uint16_t ipchksum; |
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82 | uint32_t srcipaddr; |
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83 | uint32_t destipaddr; |
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84 | } GNUC_PACKED; |
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85 | #define IP_HEADER_LEN 20 |
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86 | |||
87 | #define IP_PROTO_ICMP 1 |
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88 | #define IP_PROTO_TCP 6 |
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89 | #define IP_PROTO_UDP 17 |
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90 | |||
91 | // The ICMP header |
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92 | struct netIcmpHeader |
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93 | { |
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94 | uint8_t type; |
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95 | uint8_t icode; |
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96 | uint16_t icmpchksum; |
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97 | uint16_t id; |
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98 | uint16_t seqno; |
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99 | } GNUC_PACKED; |
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100 | #define ICMP_HEADER_LEN 8 |
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101 | |||
102 | #define ICMP_TYPE_ECHOREPLY 0 |
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103 | #define ICMP_TYPE_ECHOREQUEST 8 |
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104 | |||
105 | // The UDP header |
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106 | struct netUdpHeader |
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107 | { |
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108 | uint16_t srcport; |
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109 | uint16_t destport; |
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110 | uint16_t udplen; |
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111 | uint16_t udpchksum; |
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112 | } GNUC_PACKED; |
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113 | #define UDP_HEADER_LEN 8 |
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114 | |||
115 | // The TCP header |
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116 | struct netTcpHeader |
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117 | { |
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118 | uint16_t srcport; |
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119 | uint16_t destport; |
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120 | uint32_t seqno; |
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121 | uint32_t ackno; |
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122 | uint8_t tcpoffset; |
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123 | uint8_t flags; |
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124 | uint16_t wnd; |
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125 | uint16_t tcpchksum; |
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126 | uint16_t urgp; |
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127 | // uint8_t optdata[4]; |
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128 | } GNUC_PACKED; |
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129 | #define TCP_HEADER_LEN 20 |
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130 | |||
131 | #define TCP_FLAGS_FIN 0x01 |
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132 | #define TCP_FLAGS_SYN 0x02 |
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133 | #define TCP_FLAGS_RST 0x04 |
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134 | #define TCP_FLAGS_PSH 0x08 |
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135 | #define TCP_FLAGS_ACK 0x10 |
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136 | #define TCP_FLAGS_URG 0x20 |
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137 | |||
138 | // Ethernet/ARP header |
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139 | struct netEthArpHeader |
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140 | { |
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141 | struct netEthHeader eth; |
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142 | struct netArpHeader arp; |
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143 | } GNUC_PACKED; |
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144 | |||
145 | // Ethernet/IP header |
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146 | struct netEthIpHeader |
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147 | { |
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148 | struct netEthHeader eth; |
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149 | struct netIpHeader ip; |
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150 | } GNUC_PACKED; |
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151 | |||
152 | // The IP header |
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153 | typedef struct netIpHeader ip_hdr; |
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154 | |||
155 | // The IP/TCP headers |
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156 | typedef struct |
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157 | { |
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158 | struct netIpHeader ip; |
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159 | struct netTcpHeader tcp; |
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160 | } tcpip_hdr; |
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161 | |||
162 | // The IP/ICMP headers |
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163 | typedef struct { |
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164 | struct netIpHeader ip; |
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165 | struct netIcmpHeader icmp; |
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166 | } icmpip_hdr; |
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167 | |||
168 | |||
169 | // The UDP and IP headers |
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170 | typedef struct { |
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171 | struct netIpHeader ip; |
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172 | struct netUdpHeader udp; |
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173 | } udpip_hdr; |
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174 | |||
175 | |||
176 | //! Convert dot-notation IP address into 32-bit word. |
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177 | /// Example: IPDOT(192l,168l,1l,1l) |
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178 | #define IPDOT(a,b,c,d) ((a<<24)|(b<<16)|(c<<8)|(d)) |
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179 | |||
180 | //! Host-to-Network SHORT (16-bit) byte-order swap (macro). |
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181 | #define HTONS(s) ((s<<8) | (s>>8)) |
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182 | //! Host-to-Network LONG (32-bit) byte-order swap (macro). |
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183 | #define HTONL(l) ((l<<24) | ((l&0x00FF0000l)>>8) | ((l&0x0000FF00l)<<8) | (l>>24)) |
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184 | |||
185 | //! Host-to-Network SHORT (16-bit) byte-order swap (function). |
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186 | uint16_t htons(uint16_t val); |
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187 | //! Host-to-Network LONG (32-bit) byte-order swap (function). |
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188 | uint32_t htonl(uint32_t val); |
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189 | |||
190 | //! Calculate IP-style checksum from data. |
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191 | uint16_t netChecksum(void *data, uint16_t len); |
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192 | |||
193 | //! Print Ethernet address in XX:XX:XX:XX:XX:XX format. |
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194 | void netPrintEthAddr(struct netEthAddr* ethaddr); |
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195 | //! Print IP address in dot notation. |
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196 | void netPrintIPAddr(uint32_t ipaddr); |
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197 | //! Print Ethernet header information. |
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198 | void netPrintEthHeader(struct netEthHeader* eth_hdr); |
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199 | //! Print IP header information. |
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200 | void netPrintIpHeader(struct netIpHeader* ipheader); |
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201 | //! Print TCP header information. |
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202 | void netPrintTcpHeader(struct netTcpHeader* tcpheader); |
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203 | |||
204 | #endif |
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205 | //@} |
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206 |
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