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 / 10);
  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 no packet received, exit processing routine */
  96         if (!(RNDIS_Host_IsPacketReceived(&Ethernet_RNDIS_Interface)))
  97           return;
  98
  99         LEDs_SetAllLEDs(LEDMASK_USB_BUSY);
 100
 101         /* Read the incomming packet straight into the UIP packet buffer */
 102         RNDIS_Host_ReadPacket(&Ethernet_RNDIS_Interface, uip_buf, &uip_len);
 103
 104         /* If the packet contains an Ethernet frame, process it */
 105         if (uip_len > 0)
 106         {
 107                 switch (((struct uip_eth_hdr*)uip_buf)->type)
 108                 {
 109                         case HTONS(UIP_ETHTYPE_IP):
 110                                 /* Filter packet by MAC destination */
 111                                 uip_arp_ipin();
 112
 113                                 /* Process incomming packet */
 114                                 uip_input();
 115
 116                                 /* If a response was generated, send it */
 117                                 if (uip_len > 0)
 118                                 {
 119                                         /* Add destination MAC to outgoing packet */
 120                                         uip_arp_out();
 121
 122                                         RNDIS_Host_SendPacket(&Ethernet_RNDIS_Interface, uip_buf, uip_len);
 123                                 }
 124
 125                                 break;
 126                         case HTONS(UIP_ETHTYPE_ARP):
 127                                 /* Process ARP packet */
 128                                 uip_arp_arpin();
 129
 130                                 /* If a response was generated, send it */
 131                                 if (uip_len > 0)
 132                                   RNDIS_Host_SendPacket(&Ethernet_RNDIS_Interface, uip_buf, uip_len);
 133
 134                                 break;
 135                 }
 136         }
 137
 138         LEDs_SetAllLEDs(LEDMASK_USB_READY);
 139 }
 140
 141 /** Manages the currently open network connections, including TCP and (if enabled) UDP. */
 142 static void uIPManagement_ManageConnections(void)
 143 {
 144         /* Poll TCP connections for more data to send back to the host */
 145         for (uint8_t i = 0; i < UIP_CONNS; i++)
 146         {
 147                 uip_poll_conn(&uip_conns[i]);
 148
 149                 /* If a response was generated, send it */
 150                 if (uip_len > 0)
 151                 {
 152                         /* Add destination MAC to outgoing packet */
 153                         uip_arp_out();
 154
 155                         RNDIS_Host_SendPacket(&Ethernet_RNDIS_Interface, uip_buf, uip_len);
 156                 }
 157         }
 158
 159         /* Manage open connections for timeouts */
 160         if (timer_expired(&ConnectionTimer))
 161         {
 162                 timer_reset(&ConnectionTimer);
 163
 164                 LEDs_SetAllLEDs(LEDMASK_USB_BUSY);
 165
 166                 for (uint8_t i = 0; i < UIP_CONNS; i++)
 167                 {
 168                         /* Run periodic connection management for each TCP connection */
 169                         uip_periodic(i);
 170
 171                         /* If a response was generated, send it */
 172                         if (uip_len > 0)
 173                         {
 174                                 /* Add destination MAC to outgoing packet */
 175                                 uip_arp_out();
 176
 177                                 RNDIS_Host_SendPacket(&Ethernet_RNDIS_Interface, uip_buf, uip_len);
 178                         }
 179                 }
 180
 181                 #if defined(ENABLE_DHCP)
 182                 for (uint8_t i = 0; i < UIP_UDP_CONNS; i++)
 183                 {
 184                         /* Run periodic connection management for each UDP connection */
 185                         uip_udp_periodic(i);
 186
 187                         /* If a response was generated, send it */
 188                         if (uip_len > 0)
 189                         {
 190                                 /* Add destination MAC to outgoing packet */
 191                                 uip_arp_out();
 192
 193                                 RNDIS_Host_SendPacket(&Ethernet_RNDIS_Interface, uip_buf, uip_len);
 194                         }
 195                 }
 196                 #endif
 197
 198                 LEDs_SetAllLEDs(LEDMASK_USB_READY);
 199         }
 200
 201         /* Manage ARP cache refreshing */
 202         if (timer_expired(&ARPTimer))
 203         {
 204                 timer_reset(&ARPTimer);
 205                 uip_arp_timer();
 206         }
 207 }