Modules/IPStack/main.c

   1 /*
   2  * Acess2 IP Stack
   3  * - Stack Initialisation
   4  */
   5 #define DEBUG   0
   6 #define VERSION VER2(0,10)
   7 #include "ipstack.h"
   8 #include "link.h"
   9 #include <modules.h>
  10 #include <fs_devfs.h>
  11
  12 // === IMPORTS ===
  13 extern int      ARP_Initialise();
  14 extern void     UDP_Initialise();
  15 extern void     TCP_Initialise();
  16 extern int      IPv4_Initialise();
  17 extern int      IPv6_Initialise();
  18
  19 extern tAdapter *IPStack_GetAdapter(const char *Path);
  20 extern char     *IPStack_Root_ReadDir(tVFS_Node *Node, int Pos);
  21 extern tVFS_Node        *IPStack_Root_FindDir(tVFS_Node *Node, const char *Name);
  22 extern int      IPStack_Root_IOCtl(tVFS_Node *Node, int ID, void *Data);
  23 extern tInterface       gIP_LoopInterface;
  24 extern tInterface       *IPStack_AddInterface(const char *Device, const char *Name);
  25 extern tRoute   *IPStack_AddRoute(const char *Interface, void *Network, int SubnetBits, void *NextHop, int Metric);
  26
  27 // === PROTOTYPES ===
  28  int    IPStack_Install(char **Arguments);
  29  int    IPStack_CompareAddress(int AddressType, const void *Address1, const void *Address2, int CheckBits);
  30
  31 // === GLOBALS ===
  32 MODULE_DEFINE(0, VERSION, IPStack, IPStack_Install, NULL, NULL);
  33 tDevFS_Driver   gIP_DriverInfo = {
  34         NULL, "ip",
  35         {
  36         .Size = -1,     // Number of interfaces
  37         .NumACLs = 1,
  38         .ACLs = &gVFS_ACL_EveryoneRX,
  39         .Flags = VFS_FFLAG_DIRECTORY,
  40         .ReadDir = IPStack_Root_ReadDir,
  41         .FindDir = IPStack_Root_FindDir,
  42         .IOCtl = IPStack_Root_IOCtl
  43         }
  44 };
  45
  46 // === CODE ===
  47 /**
  48  * \fn int IPStack_Install(char **Arguments)
  49  * \brief Intialise the relevant parts of the stack and register with DevFS
  50  */
  51 int IPStack_Install(char **Arguments)
  52 {
  53          int    i = 0;
  54
  55         // Layer 3 - Network Layer Protocols
  56         ARP_Initialise();
  57         IPv4_Initialise();
  58         IPv6_Initialise();
  59         // Layer 4 - Transport Layer Protocols
  60         TCP_Initialise();
  61         UDP_Initialise();
  62
  63         if(Arguments)
  64         {
  65                 // Parse module arguments
  66                 for( i = 0; Arguments[i]; i++ )
  67                 {
  68                         // TODO:
  69                         // Define interfaces by <Device>:<Type>:<HexStreamAddress>:<Bits>
  70                         // Where:
  71                         // - <Device> is the device path (E.g. /Devices/ne2k/0)
  72                         // - <Type> is a number (e.g. 4) or symbol (e.g. AF_INET4)
  73                         // - <HexStreamAddress> is a condensed hexadecimal stream (in big endian)
  74                         //      (E.g. 0A000201 for 10.0.2.1 IPv4)
  75                         // - <Bits> is the number of subnet bits (E.g. 24 for an IPv4 Class C)
  76                         // Example: /Devices/ne2k/0:4:0A00020A:24
  77                         //  would define an interface with the address 10.0.2.10/24
  78                         if( Arguments[i][0] == '/' ) {
  79                                 // Define Interface
  80                                 char    *dev, *type, *addr, *bits;
  81
  82                                 // Read definition
  83                                 dev = Arguments[i];
  84                                 type = strchr(dev, ':');
  85                                 if( !type ) {
  86                                         Log_Warning("IPStack", "<Device>:<Type>:<HexStreamAddress>:<Bits>");
  87                                         continue;
  88                                 }
  89                                 *type = '\0';   type ++;
  90
  91                                 addr = strchr(type, ':');
  92                                 if( !addr ) {
  93                                         Log_Warning("IPStack", "<Device>:<Type>:<HexStreamAddress>:<Bits>");
  94                                         continue;
  95                                 }
  96                                 *addr = '\0';   addr ++;
  97
  98                                 bits = strchr(addr, ':');
  99                                 if( !bits ) {
 100                                         Log_Warning("IPStack", "<Device>:<Type>:<HexStreamAddress>:<Bits>");
 101                                         continue;
 102                                 }
 103                                 *bits = '\0';   bits ++;
 104
 105                                 // Define interface
 106                                 {
 107                                          int    iType = atoi(type);
 108                                          int    size = IPStack_GetAddressSize(iType);
 109                                         Uint8   addrData[size];
 110                                          int    iBits = atoi(bits);
 111
 112                                         UnHex(addrData, size, addr);
 113
 114                                         tInterface      *iface = IPStack_AddInterface(dev, "");
 115                                         if( !iface ) {
 116                                                 Log_Warning("IPStack", "Unable to add interface on '%s'", dev);
 117                                                 continue ;
 118                                         }
 119                                         iface->Type = iType;
 120                                         memcpy(iface->Address, addrData, size);
 121                                         iface->SubnetBits = iBits;
 122
 123                                         // Route for addrData/iBits, no next hop, default metric
 124                                         IPStack_AddRoute(iface->Name, iface->Address, iBits, NULL, 0);
 125
 126                                         Log_Notice("IPStack", "Boot interface %s/%i on %s",
 127                                                 IPStack_PrintAddress(iType, addrData), iBits,
 128                                                 dev);
 129                                 }
 130
 131                                 continue;
 132                         }
 133
 134                         // I could also define routes using <Interface>:<HexStreamNetwork>:<Bits>[:<HexStreamGateway>]
 135                         // Example: 1:00000000:0:0A000201
 136                         if( '0' <= Arguments[i][0] && Arguments[i][0] <= '9' )
 137                         {
 138                                 // Define Interface
 139                                 char    *ifaceName, *network, *bits, *gateway;
 140
 141                                 // Read definition
 142                                 ifaceName = Arguments[i];
 143
 144                                 network = strchr(ifaceName, ':');
 145                                 if( !network ) {
 146                                         Log_Warning("IPStack", "<iface>:<HexStreamNetwork>:<Bits>:<HexStreamGateway>");
 147                                         continue;
 148                                 }
 149                                 *network = '\0';        network ++;
 150
 151                                 bits = strchr(network, ':');
 152                                 if( !bits ) {
 153                                         Log_Warning("IPStack", "<Device>:<Type>:<HexStreamAddress>:<Bits>");
 154                                         continue;
 155                                 }
 156                                 *bits = '\0';   bits ++;
 157
 158                                 gateway = strchr(bits, ':');
 159                                 if( gateway ) {
 160                                         *gateway = '\0';        gateway ++;
 161                                 }
 162
 163                                 // Define route
 164                                 {
 165                                         tVFS_Node       *node = IPStack_Root_FindDir(NULL, ifaceName);
 166                                         if( !node ) {
 167                                                 Log_Warning("IPStack", "Unknown interface '%s' in arg %i", ifaceName, i);
 168                                                 continue ;
 169                                         }
 170                                         tInterface      *iface = node->ImplPtr;
 171
 172                                          int    size = IPStack_GetAddressSize(iface->Type);
 173                                         Uint8   netData[size];
 174                                         Uint8   gwData[size];
 175                                          int    iBits = atoi(bits);
 176
 177                                         UnHex(netData, size, network);
 178                                         if( gateway )
 179                                                 UnHex(gwData, size, gateway);
 180                                         else
 181                                                 memset(gwData, 0, size);
 182
 183                                         IPStack_AddRoute(ifaceName, netData, iBits, gwData, 30);
 184                                 }
 185
 186                                 continue;
 187                         }
 188                 }
 189         }
 190
 191         // Initialise loopback interface
 192         gIP_LoopInterface.Adapter = IPStack_GetAdapter("LOOPBACK");
 193
 194         DevFS_AddDevice( &gIP_DriverInfo );
 195
 196         return MODULE_ERR_OK;
 197 }
 198
 199 /**
 200  * \brief Gets the size (in bytes) of a specified form of address
 201  */
 202 int IPStack_GetAddressSize(int AddressType)
 203 {
 204         switch(AddressType)
 205         {
 206         case -1:        // -1 = maximum
 207                 return sizeof(tIPv6);
 208
 209         case AF_NULL:
 210                 return 0;
 211
 212         case AF_INET4:
 213                 return sizeof(tIPv4);
 214         case AF_INET6:
 215                 return sizeof(tIPv6);
 216
 217         default:
 218                 return 0;
 219         }
 220 }
 221
 222 /**
 223  * \brief Compare two IP Addresses masked by CheckBits
 224  */
 225 int IPStack_CompareAddress(int AddressType, const void *Address1, const void *Address2, int CheckBits)
 226 {
 227          int    size = IPStack_GetAddressSize(AddressType);
 228         Uint8   mask;
 229         const Uint8     *addr1 = Address1, *addr2 = Address2;
 230
 231         // Sanity check size
 232         if( CheckBits < 0 )     CheckBits = size*8;
 233         if( CheckBits > size*8 )        CheckBits = size*8;
 234
 235         if( CheckBits == 0 )    return 1;       // /0 matches anything
 236
 237         // Check first bits/8 bytes
 238         if( memcmp(Address1, Address2, CheckBits/8) != 0 )      return 0;
 239
 240         // Check if the mask is a multiple of 8
 241         if( CheckBits % 8 == 0 )        return 1;
 242
 243         // Check last bits
 244         mask = 0xFF << (8 - (CheckBits % 8));
 245         if( (addr1[CheckBits/8] & mask) == (addr2[CheckBits/8] & mask) )
 246                 return 1;
 247
 248         return 0;
 249 }
 250
 251 const char *IPStack_PrintAddress(int AddressType, const void *Address)
 252 {
 253         switch( AddressType )
 254         {
 255         case 4: {
 256                 static char     ret[4*3+3+1];
 257                 const Uint8     *addr = Address;
 258                 sprintf(ret, "%i.%i.%i.%i", addr[0], addr[1], addr[2], addr[3]);
 259                 return ret;
 260                 }
 261
 262         case 6: {       // TODO: address compression
 263                 static char     ret[8*4+7+1];
 264                 const Uint16    *addr = Address;
 265                 sprintf(ret, "%x:%x:%x:%x:%x:%x:%x:%x",
 266                         addr[0], addr[1], addr[2], addr[3],
 267                         addr[4], addr[5], addr[6], addr[7]
 268                         );
 269                 return ret;
 270                 }
 271
 272         default:
 273                 return "";
 274         }
 275 }