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annotate packages/net/common/current/src/dhcp_support.c @ 208:e0c0827131d1 ecos

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Merge from eCos master repository on 2002-05-20-20:11:54-BST
author jlarmour
date Mon, 20 May 2002 22:19:26 +0000
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children 7c34839e7e97
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1 /*==========================================================================
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2 //
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3 // dhcp_support.c
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4 //
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5 // Support code == friendly API for DHCP client
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6 //
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7 //==========================================================================
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8 //####ECOSPDCOPYRIGHTBEGIN####
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9 //
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10 // Copyright (C) 2000, 2001, 2002 Red Hat, Inc.
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11 // All Rights Reserved.
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12 //
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13 // Permission is granted to use, copy, modify and redistribute this
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14 // file.
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15 //
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16 //####ECOSPDCOPYRIGHTEND####
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17 //==========================================================================
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18 //#####DESCRIPTIONBEGIN####
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19 //
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20 // Author(s): hmt
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21 // Contributors: gthomas
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22 // Date: 2000-07-01
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23 // Purpose: DHCP support
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24 // Description:
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25 //
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26 //####DESCRIPTIONEND####
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27 //
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28 //========================================================================*/
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29
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30 #include <pkgconf/system.h>
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31 #include <pkgconf/net.h>
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32
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33 #ifdef CYGPKG_NET_DHCP
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34
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35 #include <network.h>
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36 #include <dhcp.h>
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37
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38 // ---------------------------------------------------------------------------
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39 #ifdef CYGHWR_NET_DRIVER_ETH0
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40 cyg_uint8 eth0_dhcpstate = 0;
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41 #endif
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42 #ifdef CYGHWR_NET_DRIVER_ETH1
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43 cyg_uint8 eth1_dhcpstate = 0;
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44 #endif
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45
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46 cyg_sem_t dhcp_needs_attention;
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47
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48 #ifdef CYGHWR_NET_DRIVER_ETH0
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49 struct dhcp_lease eth0_lease = { &dhcp_needs_attention, 0,0,0,0,0,0 };
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50 #endif
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51 #ifdef CYGHWR_NET_DRIVER_ETH1
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52 struct dhcp_lease eth1_lease = { &dhcp_needs_attention, 0,0,0,0,0,0 };
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53 #endif
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54
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55 // ---------------------------------------------------------------------------
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56 //
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57 // The point of this module is to deal with all the horrid written out in
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58 // full stuff of having two interfaces; it's ugly but it's also most
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59 // flexible. The dhcp_prot.c module should do all the work...
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60 //
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61 // ---------------------------------------------------------------------------
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62
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63 // return value: 1 => everything OK, no change.
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64 // 0 => close your connections, then call do_dhcp_halt() to halt the
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65 // interface(s) in question (it knows because the state will be NOTBOUND).
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66 // After that you can return to the start and use
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67 // init_all_network_interfaces(); as usual, or call do_dhcp_bind() by hand,
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68 // or whatever...
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69 int dhcp_bind( void )
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70 {
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71 #ifdef CYGHWR_NET_DRIVER_ETH0
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72 cyg_uint8 old_eth0_dhcpstate = eth0_dhcpstate;
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73 #endif
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74 #ifdef CYGHWR_NET_DRIVER_ETH1
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75 cyg_uint8 old_eth1_dhcpstate = eth1_dhcpstate;
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76 #endif
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77
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78 // If there are no interfaces at all, init it every time, doesn't
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79 // matter. In case we are called from elsewhere...
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80 if ( 1
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81 #ifdef CYGHWR_NET_DRIVER_ETH0
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82 && eth0_dhcpstate == 0
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83 #endif
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84 #ifdef CYGHWR_NET_DRIVER_ETH1
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85 && eth1_dhcpstate == 0
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86 #endif
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87 )
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88 cyg_semaphore_init( &dhcp_needs_attention, 0 );
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89
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90 // Run the state machine...
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91 #ifdef CYGHWR_NET_DRIVER_ETH0
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92 if (eth0_up
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93 && DHCPSTATE_FAILED != eth0_dhcpstate )
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94 eth0_up = do_dhcp(eth0_name, &eth0_bootp_data, &eth0_dhcpstate, &eth0_lease);
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95 #endif
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96 #ifdef CYGHWR_NET_DRIVER_ETH1
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97 if (eth1_up
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98 && DHCPSTATE_FAILED != eth1_dhcpstate )
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99 eth1_up = do_dhcp(eth1_name, &eth1_bootp_data, &eth1_dhcpstate, &eth1_lease);
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100 #endif
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101
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102 // If the interface newly came up, initialize it:
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103 // (this duplicates the code in init_all_network_interfaces() really).
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104 #ifdef CYGHWR_NET_DRIVER_ETH0
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105 if ( eth0_up
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106 && eth0_dhcpstate == DHCPSTATE_BOUND
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107 && old_eth0_dhcpstate != eth0_dhcpstate ) {
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108 if (!init_net(eth0_name, &eth0_bootp_data)) {
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109 eth0_up = false;
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110 }
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111 }
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112 #endif
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113 #ifdef CYGHWR_NET_DRIVER_ETH1
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114 if ( eth1_up
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115 && eth1_dhcpstate == DHCPSTATE_BOUND
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116 && old_eth1_dhcpstate != eth1_dhcpstate ) {
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117 if (!init_net(eth1_name, &eth1_bootp_data)) {
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118 eth1_up = false;
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119 }
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120 }
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121 #endif
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122
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123 #ifdef CYGHWR_NET_DRIVER_ETH0
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124 if ( old_eth0_dhcpstate == DHCPSTATE_BOUND &&
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125 eth0_dhcpstate == DHCPSTATE_NOTBOUND )
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126 return 0; // a lease timed out; we became unbound
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127 #endif
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128 #ifdef CYGHWR_NET_DRIVER_ETH1
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129 if ( old_eth1_dhcpstate == DHCPSTATE_BOUND &&
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130 eth1_dhcpstate == DHCPSTATE_NOTBOUND )
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131 return 0; // a lease timed out; we became unbound
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132 #endif
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133 return 1; // all is well
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134 }
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135
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136
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137 // Shutdown any interface whose state is DHCPSTATE_NOTBOUND.
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138 int dhcp_halt( void )
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139 {
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140 #ifdef CYGHWR_NET_DRIVER_ETH0
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141 if ( eth0_up
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142 && eth0_dhcpstate != DHCPSTATE_FAILED ) {
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143 do_dhcp_down_net(eth0_name, &eth0_bootp_data, &eth0_dhcpstate, &eth0_lease);
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144 }
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145 eth0_up = false;
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146 #endif
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147 #ifdef CYGHWR_NET_DRIVER_ETH1
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148 if ( eth1_up
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149 && eth1_dhcpstate != DHCPSTATE_FAILED ) {
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150 do_dhcp_down_net(eth1_name, &eth1_bootp_data, &eth1_dhcpstate, &eth1_lease);
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151 }
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152 eth1_up = false;
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153 #endif
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154 return 1;
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155 }
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156
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157
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158 // Release (and set state to DHCPSTATE_NOTBOUND) all interfaces - we are
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159 // closing down. (unlikely but maybe useful for testing)
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160 int dhcp_release( void )
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161 {
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162 #ifdef CYGHWR_NET_DRIVER_ETH0
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163 if (eth0_up)
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164 do_dhcp_release(eth0_name, &eth0_bootp_data, &eth0_dhcpstate, &eth0_lease);
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165 #endif
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166 #ifdef CYGHWR_NET_DRIVER_ETH1
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167 if (eth1_up)
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168 do_dhcp_release(eth1_name, &eth1_bootp_data, &eth1_dhcpstate, &eth1_lease);
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169 #endif
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170 return 1;
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171 }
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172
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173
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174 // ------------------------------------------------------------------------
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175 // The management thread function
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176 void dhcp_mgt_entry( cyg_addrword_t loop_on_failure )
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177 {
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178 int j;
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179 while ( 1 ) {
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180 while ( 1 ) {
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181 cyg_semaphore_wait( &dhcp_needs_attention );
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182 if ( ! dhcp_bind() ) // a lease expired
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183 break; // If we need to re-bind
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184 }
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185 dhcp_halt(); // tear everything down
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186 if ( !loop_on_failure )
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187 return; // exit the thread/return
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188 init_all_network_interfaces(); // re-initialize
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189 for ( j = 0; j < CYGPKG_NET_NLOOP; j++ )
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190 init_loopback_interface( j );
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191 #ifdef CYGPKG_SNMPAGENT
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192 SnmpdShutDown(0); // Cycle the snmpd state
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193 #endif
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194 }
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195 }
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196
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197 #ifdef CYGOPT_NET_DHCP_DHCP_THREAD
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198 // Then we provide such a thread...
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199 cyg_handle_t dhcp_mgt_thread_h = 0;
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200 cyg_thread dhcp_mgt_thread;
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201
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202 #define STACK_SIZE (CYGNUM_HAL_STACK_SIZE_TYPICAL + sizeof(struct bootp))
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203 static cyg_uint8 dhcp_mgt_stack[ STACK_SIZE ];
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204
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205 void dhcp_start_dhcp_mgt_thread( void )
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206 {
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207 if ( ! dhcp_mgt_thread_h ) {
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208 cyg_semaphore_init( &dhcp_needs_attention, 0 );
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209 cyg_thread_create(
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210 CYGPKG_NET_DHCP_THREAD_PRIORITY, /* scheduling info (eg pri) */
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211 dhcp_mgt_entry, /* entry point function */
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212 CYGOPT_NET_DHCP_DHCP_THREAD_PARAM, /* entry data */
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213 "DHCP lease mgt", /* optional thread name */
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214 dhcp_mgt_stack, /* stack base, NULL = alloc */
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215 STACK_SIZE, /* stack size, 0 = default */
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216 &dhcp_mgt_thread_h, /* returned thread handle */
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217 &dhcp_mgt_thread /* put thread here */
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218 );
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219
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220 cyg_thread_resume(dhcp_mgt_thread_h);
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221 }
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222 }
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223
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224
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225 #endif // CYGOPT_NET_DHCP_DHCP_THREAD
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226
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227 #endif // CYGPKG_NET_DHCP
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228
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229 // EOF dhcp_support.c