Projects/Webserver/Lib/uIPManagement.c

   1 /*
   2              LUFA Library
   3      Copyright (C) Dean Camera, 2010.
   4
   5   dean [at] fourwalledcubicle [dot] com
   6       www.fourwalledcubicle.com
   7 */
   8
   9 /*
  10   Copyright 2010  Dean Camera (dean [at] fourwalledcubicle [dot] com)
  11
  12   Permission to use, copy, modify, distribute, and sell this
  13   software and its documentation for any purpose is hereby granted
  14   without fee, provided that the above copyright notice appear in
  15   all copies and that both that the copyright notice and this
  16   permission notice and warranty disclaimer appear in supporting
  17   documentation, and that the name of the author not be used in
  18   advertising or publicity pertaining to distribution of the
  19   software without specific, written prior permission.
  20
  21   The author disclaim all warranties with regard to this
  22   software, including all implied warranties of merchantability
  23   and fitness.  In no event shall the author be liable for any
  24   special, indirect or consequential damages or any damages
  25   whatsoever resulting from loss of use, data or profits, whether
  26   in an action of contract, negligence or other tortious action,
  27   arising out of or in connection with the use or performance of
  28   this software.
  29 */
  30
  31 /** \file
  32  *
  33  *  uIP Managament functions. This file contains the functions and globals needed to maintain the uIP
  34  *  stack once an RNDIS device has been attached to the system.
  35  */
  36
  37 #define  INCLUDE_FROM_UIPMANAGEMENT_C
  38 #include "uIPManagement.h"
  39
  40 /** Connection timer, to retain the time elapsed since the last time the uIP connections were managed. */
  41 struct timer ConnectionTimer;
  42
  43 /** ARP timer, to retain the time elapsed since the ARP cache was last updated. */
  44 struct timer ARPTimer;
  45
  46 /** MAC address of the RNDIS device, when enumerated */
  47 struct uip_eth_addr MACAddress;
  48
  49
  50 /** Configures the uIP stack ready for network traffic. */
  51 void uIPManagement_Init(void)
  52 {
  53         /* uIP Timing Initialization */
  54         clock_init();
  55         timer_set(&ConnectionTimer, CLOCK_SECOND / 100);
  56         timer_set(&ARPTimer, CLOCK_SECOND * 10);
  57
  58         /* uIP Stack Initialization */
  59         uip_init();
  60
  61         /* DHCP/Server IP Settings Initialization */
  62         #if defined(ENABLE_DHCP)
  63         DHCPApp_Init();
  64         #else
  65         uip_ipaddr_t IPAddress, Netmask, GatewayIPAddress;
  66         uip_ipaddr(&IPAddress,        DEVICE_IP_ADDRESS[0], DEVICE_IP_ADDRESS[1], DEVICE_IP_ADDRESS[2], DEVICE_IP_ADDRESS[3]);
  67         uip_ipaddr(&Netmask,          DEVICE_NETMASK[0],    DEVICE_NETMASK[1],    DEVICE_NETMASK[2],    DEVICE_NETMASK[3]);
  68         uip_ipaddr(&GatewayIPAddress, DEVICE_GATEWAY[0],    DEVICE_GATEWAY[1],    DEVICE_GATEWAY[2],    DEVICE_GATEWAY[3]);
  69         uip_sethostaddr(&IPAddress);
  70         uip_setnetmask(&Netmask);
  71         uip_setdraddr(&GatewayIPAddress);
  72         #endif
  73
  74         uip_setethaddr(MACAddress);
  75
  76         /* HTTP Webserver Initialization */
  77         WebserverApp_Init();
  78 }
  79
  80 /** uIP Management function. This function manages the uIP stack when called while an RNDIS device has been
  81  *  attached to the system.
  82  */
  83 void uIPManagement_ManageNetwork(void)
  84 {
  85         if ((USB_CurrentMode == USB_MODE_HOST) && (USB_HostState == HOST_STATE_Configured))
  86         {
  87                 uIPManagement_ProcessIncommingPacket();
  88                 uIPManagement_ManageConnections();
  89         }
  90 }
  91
  92 /** Processes incomming packets to the server from the connected RNDIS device, creating responses as needed. */
  93 static void uIPManagement_ProcessIncommingPacket(void)
  94 {
  95         if (RNDIS_Host_IsPacketReceived(&Ethernet_RNDIS_Interface))
  96         {
  97                 LEDs_SetAllLEDs(LEDMASK_USB_BUSY);
  98
  99                 /* Read the incomming packet straight into the UIP packet buffer */
 100                 RNDIS_Host_ReadPacket(&Ethernet_RNDIS_Interface, &uip_buf[0], &uip_len);
 101
 102                 if (uip_len > 0)
 103                 {
 104                         bool PacketHandled = true;
 105
 106                         struct uip_eth_hdr* EthernetHeader = (struct uip_eth_hdr*)&uip_buf[0];
 107                         if (EthernetHeader->type == HTONS(UIP_ETHTYPE_IP))
 108                         {
 109                                 /* Filter packet by MAC destination */
 110                                 uip_arp_ipin();
 111
 112                                 /* Process incomming packet */
 113                                 uip_input();
 114
 115                                 /* Add destination MAC to outgoing packet */
 116                                 if (uip_len > 0)
 117                                   uip_arp_out();
 118                         }
 119                         else if (EthernetHeader->type == HTONS(UIP_ETHTYPE_ARP))
 120                         {
 121                                 /* Process ARP packet */
 122                                 uip_arp_arpin();
 123                         }
 124                         else
 125                         {
 126                                 PacketHandled = false;
 127                         }
 128
 129                         /* If a response was generated, send it */
 130                         if ((uip_len > 0) && PacketHandled)
 131                           RNDIS_Host_SendPacket(&Ethernet_RNDIS_Interface, &uip_buf[0], uip_len);
 132                 }
 133
 134                 LEDs_SetAllLEDs(LEDMASK_USB_READY);
 135         }
 136 }
 137
 138 /** Manages the currently open network connections, including TCP and (if enabled) UDP. */
 139 static void uIPManagement_ManageConnections(void)
 140 {
 141         /* Manage open connections */
 142         if (timer_expired(&ConnectionTimer))
 143         {
 144                 timer_reset(&ConnectionTimer);
 145
 146                 LEDs_SetAllLEDs(LEDMASK_USB_BUSY);
 147
 148                 for (uint8_t i = 0; i < UIP_CONNS; i++)
 149                 {
 150                         /* Run periodic connection management for each TCP connection */
 151                         uip_periodic(i);
 152
 153                         /* If a response was generated, send it */
 154                         if (uip_len > 0)
 155                         {
 156                                 /* Add destination MAC to outgoing packet */
 157                                 uip_arp_out();
 158
 159                                 RNDIS_Host_SendPacket(&Ethernet_RNDIS_Interface, &uip_buf[0], uip_len);
 160                         }
 161                 }
 162
 163                 #if defined(ENABLE_DHCP)
 164                 for (uint8_t i = 0; i < UIP_UDP_CONNS; i++)
 165                 {
 166                         /* Run periodic connection management for each UDP connection */
 167                         uip_udp_periodic(i);
 168
 169                         /* If a response was generated, send it */
 170                         if (uip_len > 0)
 171                         {
 172                                 /* Add destination MAC to outgoing packet */
 173                                 uip_arp_out();
 174
 175                                 RNDIS_Host_SendPacket(&Ethernet_RNDIS_Interface, &uip_buf[0], uip_len);
 176                         }
 177                 }
 178                 #endif
 179
 180                 LEDs_SetAllLEDs(LEDMASK_USB_READY);
 181         }
 182
 183         /* Manage ARP cache refreshing */
 184         if (timer_expired(&ARPTimer))
 185         {
 186                 timer_reset(&ARPTimer);
 187                 uip_arp_timer();
 188         }
 189 }