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
 127                                 continue;
 128                         }
 129
 130                         // I could also define routes using <Interface>:<HexStreamNetwork>:<Bits>[:<HexStreamGateway>]
 131                         // Example: 1:00000000:0:0A000201
 132                         if( '0' <= Arguments[i][0] && Arguments[i][0] <= '9' )
 133                         {
 134                                 // Define Interface
 135                                 char    *ifaceName, *network, *bits, *gateway;
 136
 137                                 // Read definition
 138                                 ifaceName = Arguments[i];
 139
 140                                 network = strchr(ifaceName, ':');
 141                                 if( !network ) {
 142                                         Log_Warning("IPStack", "<iface>:<HexStreamNetwork>:<Bits>:<HexStreamGateway>");
 143                                         continue;
 144                                 }
 145                                 *network = '\0';        network ++;
 146
 147                                 bits = strchr(network, ':');
 148                                 if( !bits ) {
 149                                         Log_Warning("IPStack", "<Device>:<Type>:<HexStreamAddress>:<Bits>");
 150                                         continue;
 151                                 }
 152                                 *bits = '\0';   bits ++;
 153
 154                                 gateway = strchr(bits, ':');
 155                                 if( gateway ) {
 156                                         *gateway = '\0';        gateway ++;
 157                                 }
 158
 159                                 // Define route
 160                                 {
 161                                         tVFS_Node       *node = IPStack_Root_FindDir(NULL, ifaceName);
 162                                         if( !node ) {
 163                                                 Log_Warning("IPStack", "Unknown interface '%s' in arg %i", ifaceName, i);
 164                                                 continue ;
 165                                         }
 166                                         tInterface      *iface = node->ImplPtr;
 167
 168                                          int    size = IPStack_GetAddressSize(iface->Type);
 169                                         Uint8   netData[size];
 170                                         Uint8   gwData[size];
 171                                          int    iBits = atoi(bits);
 172
 173                                         UnHex(netData, size, network);
 174                                         if( gateway )
 175                                                 UnHex(gwData, size, gateway);
 176                                         else
 177                                                 memset(gwData, 0, size);
 178
 179                                         IPStack_AddRoute(ifaceName, netData, iBits, gwData, 30);
 180                                 }
 181
 182                                 continue;
 183                         }
 184                 }
 185         }
 186
 187         // Initialise loopback interface
 188         gIP_LoopInterface.Adapter = IPStack_GetAdapter("LOOPBACK");
 189
 190         DevFS_AddDevice( &gIP_DriverInfo );
 191
 192         return MODULE_ERR_OK;
 193 }
 194
 195 /**
 196  * \brief Gets the size (in bytes) of a specified form of address
 197  */
 198 int IPStack_GetAddressSize(int AddressType)
 199 {
 200         switch(AddressType)
 201         {
 202         case -1:        // -1 = maximum
 203                 return sizeof(tIPv6);
 204
 205         case AF_NULL:
 206                 return 0;
 207
 208         case AF_INET4:
 209                 return sizeof(tIPv4);
 210         case AF_INET6:
 211                 return sizeof(tIPv6);
 212
 213         default:
 214                 return 0;
 215         }
 216 }
 217
 218 /**
 219  * \brief Compare two IP Addresses masked by CheckBits
 220  */
 221 int IPStack_CompareAddress(int AddressType, const void *Address1, const void *Address2, int CheckBits)
 222 {
 223          int    size = IPStack_GetAddressSize(AddressType);
 224         Uint8   mask;
 225         const Uint8     *addr1 = Address1, *addr2 = Address2;
 226
 227         // Sanity check size
 228         if( CheckBits < 0 )     CheckBits = 0;
 229         if( CheckBits > size*8 )        CheckBits = size*8;
 230
 231         if( CheckBits == 0 )    return 1;       // /0 matches anything
 232
 233         // Check first bits/8 bytes
 234         if( memcmp(Address1, Address2, CheckBits/8) != 0 )      return 0;
 235
 236         // Check if the mask is a multiple of 8
 237         if( CheckBits % 8 == 0 )        return 1;
 238
 239         // Check last bits
 240         mask = 0xFF << (8 - (CheckBits % 8));
 241         if( (addr1[CheckBits/8] & mask) == (addr2[CheckBits/8] & mask) )
 242                 return 1;
 243
 244         return 0;
 245 }
 246
 247 const char *IPStack_PrintAddress(int AddressType, const void *Address)
 248 {
 249         switch( AddressType )
 250         {
 251         case 4: {
 252                 static char     ret[4*3+3+1];
 253                 const Uint8     *addr = Address;
 254                 sprintf(ret, "%i.%i.%i.%i", addr[0], addr[1], addr[2], addr[3]);
 255                 return ret;
 256                 }
 257
 258         case 6: {       // TODO: address compression
 259                 static char     ret[8*4+7+1];
 260                 const Uint16    *addr = Address;
 261                 sprintf(ret, "%x:%x:%x:%x:%x:%x:%x:%x",
 262                         addr[0], addr[1], addr[2], addr[3],
 263                         addr[4], addr[5], addr[6], addr[7]
 264                         );
 265                 return ret;
 266                 }
 267
 268         default:
 269                 return "";
 270         }
 271 }