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annotate packages/net/common/current/src/dhcp_support.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 // 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 // ####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): hmt
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43 // Contributors: gthomas
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44 // Date: 2000-07-01
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45 // Purpose: DHCP support
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46 // Description:
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47 //
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48 //####DESCRIPTIONEND####
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49 //
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50 //========================================================================*/
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51
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52 #include <pkgconf/system.h>
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53 #include <pkgconf/net.h>
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54
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55 #ifdef CYGPKG_NET_DHCP
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56
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57 #include <network.h>
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58 #include <dhcp.h>
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59
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60 // ---------------------------------------------------------------------------
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61 #ifdef CYGHWR_NET_DRIVER_ETH0
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62 cyg_uint8 eth0_dhcpstate = 0;
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63 #endif
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64 #ifdef CYGHWR_NET_DRIVER_ETH1
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65 cyg_uint8 eth1_dhcpstate = 0;
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66 #endif
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67
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68 cyg_sem_t dhcp_needs_attention;
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69
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70 #ifdef CYGHWR_NET_DRIVER_ETH0
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71 struct dhcp_lease eth0_lease = { &dhcp_needs_attention, 0,0,0,0,0,0 };
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72 #endif
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73 #ifdef CYGHWR_NET_DRIVER_ETH1
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74 struct dhcp_lease eth1_lease = { &dhcp_needs_attention, 0,0,0,0,0,0 };
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75 #endif
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76
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77 // ---------------------------------------------------------------------------
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78 //
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79 // The point of this module is to deal with all the horrid written out in
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80 // full stuff of having two interfaces; it's ugly but it's also most
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81 // flexible. The dhcp_prot.c module should do all the work...
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82 //
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83 // ---------------------------------------------------------------------------
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84
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85 // return value: 1 => everything OK, no change.
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86 // 0 => close your connections, then call do_dhcp_halt() to halt the
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87 // interface(s) in question (it knows because the state will be NOTBOUND).
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88 // After that you can return to the start and use
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89 // init_all_network_interfaces(); as usual, or call do_dhcp_bind() by hand,
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90 // or whatever...
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91 int dhcp_bind( void )
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92 {
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93 #ifdef CYGHWR_NET_DRIVER_ETH0
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94 cyg_uint8 old_eth0_dhcpstate = eth0_dhcpstate;
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95 #endif
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96 #ifdef CYGHWR_NET_DRIVER_ETH1
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97 cyg_uint8 old_eth1_dhcpstate = eth1_dhcpstate;
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98 #endif
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99
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100 // If there are no interfaces at all, init it every time, doesn't
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101 // matter. In case we are called from elsewhere...
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102 if ( 1
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103 #ifdef CYGHWR_NET_DRIVER_ETH0
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104 && eth0_dhcpstate == 0
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105 #endif
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106 #ifdef CYGHWR_NET_DRIVER_ETH1
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107 && eth1_dhcpstate == 0
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108 #endif
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109 )
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110 cyg_semaphore_init( &dhcp_needs_attention, 0 );
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111
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112 // Run the state machine...
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113 #ifdef CYGHWR_NET_DRIVER_ETH0
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114 if (eth0_up
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115 && DHCPSTATE_FAILED != eth0_dhcpstate )
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116 eth0_up = do_dhcp(eth0_name, &eth0_bootp_data, &eth0_dhcpstate, &eth0_lease);
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117 #endif
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118 #ifdef CYGHWR_NET_DRIVER_ETH1
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119 if (eth1_up
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120 && DHCPSTATE_FAILED != eth1_dhcpstate )
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121 eth1_up = do_dhcp(eth1_name, &eth1_bootp_data, &eth1_dhcpstate, &eth1_lease);
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122 #endif
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123
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124 // If the interface newly came up, initialize it:
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125 // (this duplicates the code in init_all_network_interfaces() really).
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126 #ifdef CYGHWR_NET_DRIVER_ETH0
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127 if ( eth0_up
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128 && eth0_dhcpstate == DHCPSTATE_BOUND
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129 && old_eth0_dhcpstate != eth0_dhcpstate ) {
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130 if (!init_net(eth0_name, &eth0_bootp_data)) {
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131 eth0_up = false;
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132 }
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133 }
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134 #endif
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135 #ifdef CYGHWR_NET_DRIVER_ETH1
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136 if ( eth1_up
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137 && eth1_dhcpstate == DHCPSTATE_BOUND
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138 && old_eth1_dhcpstate != eth1_dhcpstate ) {
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139 if (!init_net(eth1_name, &eth1_bootp_data)) {
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140 eth1_up = false;
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141 }
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142 }
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143 #endif
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144
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145 #ifdef CYGHWR_NET_DRIVER_ETH0
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146 if ( old_eth0_dhcpstate == DHCPSTATE_BOUND &&
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147 eth0_dhcpstate == DHCPSTATE_NOTBOUND )
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148 return 0; // a lease timed out; we became unbound
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149 #endif
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150 #ifdef CYGHWR_NET_DRIVER_ETH1
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151 if ( old_eth1_dhcpstate == DHCPSTATE_BOUND &&
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152 eth1_dhcpstate == DHCPSTATE_NOTBOUND )
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153 return 0; // a lease timed out; we became unbound
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154 #endif
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155 return 1; // all is well
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156 }
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157
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158
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159 // Shutdown any interface whose state is DHCPSTATE_NOTBOUND.
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160 int dhcp_halt( 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 && eth0_dhcpstate != DHCPSTATE_FAILED ) {
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165 do_dhcp_down_net(eth0_name, &eth0_bootp_data, &eth0_dhcpstate, &eth0_lease);
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166 }
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167 eth0_up = false;
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168 #endif
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169 #ifdef CYGHWR_NET_DRIVER_ETH1
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170 if ( eth1_up
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171 && eth1_dhcpstate != DHCPSTATE_FAILED ) {
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172 do_dhcp_down_net(eth1_name, &eth1_bootp_data, &eth1_dhcpstate, &eth1_lease);
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173 }
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174 eth1_up = false;
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175 #endif
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176 return 1;
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177 }
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178
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179
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180 // Release (and set state to DHCPSTATE_NOTBOUND) all interfaces - we are
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181 // closing down. (unlikely but maybe useful for testing)
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182 int dhcp_release( void )
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183 {
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184 #ifdef CYGHWR_NET_DRIVER_ETH0
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185 if (eth0_up)
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186 do_dhcp_release(eth0_name, &eth0_bootp_data, &eth0_dhcpstate, &eth0_lease);
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187 #endif
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188 #ifdef CYGHWR_NET_DRIVER_ETH1
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189 if (eth1_up)
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190 do_dhcp_release(eth1_name, &eth1_bootp_data, &eth1_dhcpstate, &eth1_lease);
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191 #endif
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192 return 1;
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193 }
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194
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195
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196 // ------------------------------------------------------------------------
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197 // The management thread function
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198 //
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199 // Note: 2007-01-15
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200 // This single management thread attempts to keep all configured
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201 // interfaces alive via DHCP. While this may be sufficient for
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202 // many systems, it falls short of perfect. There should probably
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203 // be a separate thread for each possible interface, along with
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204 // appropriate CDL to control how each inteface is managed.
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205 //
208
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206 void dhcp_mgt_entry( cyg_addrword_t loop_on_failure )
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207 {
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208 int j;
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209 bool any_interfaces_up;
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210
208
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211 while ( 1 ) {
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212 while ( 1 ) {
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213 cyg_semaphore_wait( &dhcp_needs_attention );
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214 if ( ! dhcp_bind() ) // a lease expired
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215 break; // If we need to re-bind
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216 }
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217 dhcp_halt(); // tear everything down
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218 if ( !loop_on_failure )
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219 return; // exit the thread/return
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220 do {
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221 init_all_network_interfaces(); // re-initialize
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222 // If at least one interface is up, then the DHCP machine will run
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223 any_interfaces_up = false;
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224 #ifdef CYGHWR_NET_DRIVER_ETH0
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225 any_interfaces_up |= eth0_up;
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226 #endif
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227 #ifdef CYGHWR_NET_DRIVER_ETH1
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228 any_interfaces_up |= eth1_up;
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229 #endif
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230 } while (!any_interfaces_up);
208
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231 for ( j = 0; j < CYGPKG_NET_NLOOP; j++ )
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232 init_loopback_interface( j );
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233 #ifdef CYGPKG_SNMPAGENT
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234 SnmpdShutDown(0); // Cycle the snmpd state
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235 #endif
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236 }
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237 }
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238
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239 #ifdef CYGOPT_NET_DHCP_DHCP_THREAD
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240 // Then we provide such a thread...
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241 cyg_handle_t dhcp_mgt_thread_h = 0;
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242 cyg_thread dhcp_mgt_thread;
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243
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244 static cyg_uint8 dhcp_mgt_stack[ CYGPKG_NET_DHCP_THREAD_STACK_SIZE ];
208
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245
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246 void dhcp_start_dhcp_mgt_thread( void )
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247 {
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248 if ( ! dhcp_mgt_thread_h ) {
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249 cyg_semaphore_init( &dhcp_needs_attention, 0 );
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250 cyg_thread_create(
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251 CYGPKG_NET_DHCP_THREAD_PRIORITY, /* scheduling info (eg pri) */
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252 dhcp_mgt_entry, /* entry point function */
208
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253 CYGOPT_NET_DHCP_DHCP_THREAD_PARAM, /* entry data */
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254 "DHCP lease mgt", /* optional thread name */
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255 dhcp_mgt_stack, /* stack base, NULL = alloc */
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256 CYGPKG_NET_DHCP_THREAD_STACK_SIZE, /* stack size, 0 = default */
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257 &dhcp_mgt_thread_h, /* returned thread handle */
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258 &dhcp_mgt_thread /* put thread here */
208
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259 );
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260
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261 cyg_thread_resume(dhcp_mgt_thread_h);
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262 }
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263 }
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264
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265
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266 #endif // CYGOPT_NET_DHCP_DHCP_THREAD
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267
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268 #endif // CYGPKG_NET_DHCP
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269
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270 // EOF dhcp_support.c