Modules/IPStack/routing.c

   1 /*
   2  * Acess2 IP Stack
   3  * - Routing Tables
   4  */
   5 #define DEBUG   0
   6 #define VERSION VER2(0,10)
   7 #include <acess.h>
   8 #include <tpl_drv_common.h>
   9 #include "ipstack.h"
  10 #include "link.h"
  11
  12 #define DEFAUTL_METRIC  30
  13
  14 // === IMPORTS ===
  15 extern tInterface       *gIP_Interfaces;
  16 extern tVFS_Node        *IPStack_Root_FindDir(tVFS_Node *Node, const char *Filename);
  17
  18 // === PROTOTYPES ===
  19 // - Routes directory
  20 char    *IPStack_RouteDir_ReadDir(tVFS_Node *Node, int Pos);
  21 tVFS_Node       *IPStack_RouteDir_FindDir(tVFS_Node *Node, const char *Name);
  22  int    IPStack_RouteDir_IOCtl(tVFS_Node *Node, int ID, void *Data);
  23 // - Route Management
  24 tRoute  *IPStack_Route_Create(const char *InterfaceName);
  25 tRoute  *IPStack_AddRoute(const char *Interface, void *Network, int SubnetBits, void *NextHop, int Metric);
  26 tRoute  *IPStack_FindRoute(int AddressType, tInterface *Interface, void *Address);
  27 // - Individual Routes
  28  int    IPStack_Route_IOCtl(tVFS_Node *Node, int ID, void *Data);
  29
  30 // === GLOBALS ===
  31  int    giIP_NextRouteId = 1;
  32 tRoute  *gIP_Routes;
  33 tRoute  *gIP_RoutesEnd;
  34 tVFS_Node       gIP_RouteNode = {
  35         Flags: VFS_FFLAG_DIRECTORY,
  36         Size: -1,
  37         NumACLs: 1,
  38         ACLs: &gVFS_ACL_EveryoneRX,
  39         ReadDir: IPStack_RouteDir_ReadDir,
  40         FindDir: IPStack_RouteDir_FindDir,
  41         IOCtl: IPStack_RouteDir_IOCtl
  42 };
  43
  44 // === CODE ===
  45 /**
  46  * \brief ReadDir for the /Devices/ip/routes/ directory
  47  */
  48 char *IPStack_RouteDir_ReadDir(tVFS_Node *Node, int Pos)
  49 {
  50         tRoute  *rt;
  51
  52         for(rt = gIP_Routes; rt && Pos --; rt = rt->Next);
  53
  54         if( !rt ) {
  55                 return NULL;
  56         }
  57
  58         {
  59                  int    len = sprintf(NULL, "%i", rt->Node.Inode);
  60                 char    buf[len+1];
  61                 sprintf(buf, "%i", rt->Node.Inode);
  62                 return strdup(buf);
  63         }
  64 }
  65
  66 /**
  67  * \brief FindDir for the /Devices/ip/routes/ directory
  68  */
  69 tVFS_Node *IPStack_RouteDir_FindDir(tVFS_Node *Node, const char *Name)
  70 {
  71          int    num = atoi(Name);
  72         tRoute  *rt;
  73
  74         // Zero is invalid, sorry :)
  75         if( !num )      return NULL;
  76
  77         // The list is inherently sorted, so we can do a quick search
  78         for(rt = gIP_Routes; rt && rt->Node.Inode < num; rt = rt->Next);
  79         // Fast fail on larger number
  80         if( rt->Node.Inode > num )
  81                 return NULL;
  82
  83         return &rt->Node;
  84 }
  85
  86 /**
  87  * \brief Names for the route list IOCtl Calls
  88  */
  89 static const char *casIOCtls_RouteDir[] = {
  90         DRV_IOCTLNAMES,
  91         "add_route",    // Add a route - char *InterfaceName
  92         "locate_route", // Find the best route for an address - struct {int Type, char Address[]} *
  93         NULL
  94         };
  95
  96 /**
  97  * \brief IOCtl for /Devices/ip/routes/
  98  */
  99 int IPStack_RouteDir_IOCtl(tVFS_Node *Node, int ID, void *Data)
 100 {
 101          int    tmp;
 102         tRoute  *rt;
 103         ENTER("pNode iID pData", Node, ID, Data);
 104         switch(ID)
 105         {
 106         // --- Standard IOCtls (0-3) ---
 107         BASE_IOCTLS(DRV_TYPE_MISC, STR(IDENT), VERSION, casIOCtls_RouteDir)
 108
 109         case 4: // Add Route
 110                 if( !CheckString(Data) )        LEAVE_RET('i', -1);
 111                 rt = IPStack_Route_Create(Data);
 112                 if( !rt )
 113                         tmp = -1;
 114                 else
 115                         tmp = rt->Node.Inode;
 116                 LEAVE('i', tmp);
 117                 return tmp;
 118
 119         case 5: // Locate Route
 120                 {
 121                         struct {
 122                                  int    Type;
 123                                 Uint8   Addr[];
 124                         }       *data = Data;
 125
 126                         if( !CheckMem(Data, sizeof(int)) )
 127                                 LEAVE_RET('i', -1);
 128                         if( !CheckMem(Data, sizeof(int) + IPStack_GetAddressSize(data->Type)) )
 129                                 LEAVE_RET('i', -1);
 130
 131                         Log_Debug("IPStack", "Route_RouteDir_IOCtl - FindRoute %i, %s",
 132                                 data->Type, IPStack_PrintAddress(data->Type, data->Addr) );
 133                         rt = IPStack_FindRoute(data->Type, NULL, data->Addr);
 134
 135                         if( !rt )
 136                                 LEAVE_RET('i', 0);
 137
 138                         LEAVE('i', rt->Node.Inode);
 139                         return rt->Node.Inode;
 140                 }
 141                 break;
 142         }
 143         LEAVE('i', 0);
 144         return 0;
 145 }
 146
 147 /**
 148  * \brief Create a new route entry
 149  * \param InterfaceName Name of the interface using this route
 150  */
 151 tRoute *IPStack_Route_Create(const char *InterfaceName)
 152 {
 153         tRoute  *rt;
 154         tInterface      *iface;
 155          int    size;
 156
 157         // Get interface
 158         // Note: Oh man! This is such a hack
 159         {
 160                 tVFS_Node       *node = IPStack_Root_FindDir(NULL, InterfaceName);
 161                 if( !node ) {
 162                         Log_Debug("IPStack", "IPStack_Route_Create - Unknown interface '%s'\n", InterfaceName);
 163                         return NULL;
 164                 }
 165                 iface = node->ImplPtr;
 166                 if(node->Close) node->Close(node);
 167         }
 168
 169         // Get the size of the specified address type
 170         size = IPStack_GetAddressSize(iface->Type);
 171         if( size == 0 ) {
 172                 return NULL;
 173         }
 174
 175         // Allocate space
 176         rt = calloc(1, sizeof(tRoute) + size*2 );
 177
 178         // Set up node
 179         rt->Node.ImplPtr = rt;
 180         rt->Node.Inode = giIP_NextRouteId ++;
 181         rt->Node.Size = 0;
 182         rt->Node.NumACLs = 1,
 183         rt->Node.ACLs = &gVFS_ACL_EveryoneRO;
 184         rt->Node.IOCtl = IPStack_Route_IOCtl;
 185
 186         // Set up state
 187         rt->AddressType = iface->Type;
 188         rt->Network = (void *)( (tVAddr)rt + sizeof(tRoute) );
 189         rt->SubnetBits = 0;
 190         rt->NextHop = (void *)( (tVAddr)rt + sizeof(tRoute) + size );
 191         rt->Interface = iface;
 192         rt->Metric = DEFAUTL_METRIC;
 193         memset(rt->Network, 0, size);
 194         memset(rt->NextHop, 0, size);
 195
 196         // Add to list
 197         if( gIP_RoutesEnd ) {
 198                 gIP_RoutesEnd->Next = rt;
 199                 gIP_RoutesEnd = rt;
 200         }
 201         else {
 202                 gIP_Routes = gIP_RoutesEnd = rt;
 203         }
 204
 205         Log_Log("IPStack", "Route entry for '%s' created", InterfaceName);
 206
 207         return rt;
 208 }
 209
 210 /**
 211  * \brief Add and fill a route
 212  */
 213 tRoute *IPStack_AddRoute(const char *Interface, void *Network, int SubnetBits, void *NextHop, int Metric)
 214 {
 215         tRoute  *rt = IPStack_Route_Create(Interface);
 216          int    addrSize;
 217
 218         if( !rt )       return NULL;
 219
 220         addrSize = IPStack_GetAddressSize(rt->Interface->Type);
 221
 222         memcpy(rt->Network, Network, addrSize);
 223         if( NextHop )
 224                 memcpy(rt->NextHop, NextHop, addrSize);
 225         rt->SubnetBits = SubnetBits;
 226         if( Metric )
 227                 rt->Metric = Metric;
 228
 229         return rt;
 230 }
 231
 232 /**
 233  */
 234 tRoute *IPStack_FindRoute(int AddressType, tInterface *Interface, void *Address)
 235 {
 236         tRoute  *rt;
 237         tRoute  *best = NULL;
 238         tInterface      *iface;
 239          int    addrSize;
 240
 241         ENTER("iAddressType pInterface sAddress",
 242                 AddressType, Interface, IPStack_PrintAddress(AddressType, Address));
 243
 244         if( Interface && AddressType != Interface->Type ) {
 245                 LOG("Interface->Type (%i) != AddressType", Interface->Type);
 246                 LEAVE('n');
 247                 return NULL;
 248         }
 249
 250         // Get address size
 251         addrSize = IPStack_GetAddressSize(AddressType);
 252
 253         // Check against explicit routes
 254         for( rt = gIP_Routes; rt; rt = rt->Next )
 255         {
 256                 // Check interface
 257                 if( Interface && rt->Interface != Interface )   continue;
 258                 // Check address type
 259                 if( rt->AddressType != AddressType )    continue;
 260
 261                 LOG("Checking network %s/%i", IPStack_PrintAddress(AddressType, rt->Network), rt->SubnetBits);
 262
 263                 // Check if the address matches
 264                 if( !IPStack_CompareAddress(AddressType, rt->Network, Address, rt->SubnetBits) )
 265                         continue;
 266
 267                 if( best ) {
 268                         // More direct routes are preferred
 269                         if( best->SubnetBits > rt->SubnetBits ) {
 270                                 LOG("Skipped - less direct (%i < %i)", rt->SubnetBits, best->SubnetBits);
 271                                 continue;
 272                         }
 273                         // If equally direct, choose the best metric
 274                         if( best->SubnetBits == rt->SubnetBits && best->Metric < rt->Metric ) {
 275                                 LOG("Skipped - higher metric (%i > %i)", rt->Metric, best->Metric);
 276                                 continue;
 277                         }
 278                 }
 279
 280                 best = rt;
 281         }
 282
 283         // Check against implicit routes
 284         if( !best && !Interface )
 285         {
 286                 for( iface = gIP_Interfaces; iface; iface = iface->Next )
 287                 {
 288                         if( Interface && iface != Interface )   continue;
 289                         if( iface->Type != AddressType )        continue;
 290
 291
 292                         // Check if the address matches
 293                         if( !IPStack_CompareAddress(AddressType, iface->Address, Address, iface->SubnetBits) )
 294                                 continue;
 295
 296                         if( best ) {
 297                                 // More direct routes are preferred
 298                                 if( best->SubnetBits > rt->SubnetBits ) {
 299                                         LOG("Skipped - less direct (%i < %i)", rt->SubnetBits, best->SubnetBits);
 300                                         continue;
 301                                 }
 302                                 // If equally direct, choose the best metric
 303                                 if( best->SubnetBits == rt->SubnetBits && best->Metric < rt->Metric ) {
 304                                         LOG("Skipped - higher metric (%i > %i)", rt->Metric, best->Metric);
 305                                         continue;
 306                                 }
 307                         }
 308
 309                         rt = &iface->Route;
 310                         memcpy(rt->Network, iface->Address, addrSize);
 311                         memset(rt->NextHop, 0, addrSize);
 312                         rt->Metric = DEFAUTL_METRIC;
 313                         rt->SubnetBits = iface->SubnetBits;
 314
 315                         best = rt;
 316                 }
 317         }
 318         if( !best && Interface )
 319         {
 320                 rt = &Interface->Route;
 321                 // Make sure route is up to date
 322                 memcpy(rt->Network, iface->Address, addrSize);
 323                 memset(rt->NextHop, 0, addrSize);
 324                 rt->Metric = DEFAUTL_METRIC;
 325                 rt->SubnetBits = iface->SubnetBits;
 326
 327                 if( IPStack_CompareAddress(AddressType, rt->Network, Address, rt->SubnetBits) )
 328                 {
 329                         best = rt;
 330                 }
 331         }
 332
 333         LEAVE('p', best);
 334         return best;
 335 }
 336
 337 /**
 338  * \brief Names for route IOCtl Calls
 339  */
 340 static const char *casIOCtls_Route[] = {
 341         DRV_IOCTLNAMES,
 342         "get_type",     // Get address type - (void), returns integer type
 343         "get_network",  // Get network - (void *Data), returns boolean success
 344         "set_network",  // Set network - (void *Data), returns boolean success
 345         "get_nexthop",  // Get next hop - (void *Data), returns boolean success
 346         "set_nexthop",  // Set next hop - (void *Data), returns boolean success
 347         "getset_subnetbits",    // Get/Set subnet bits - (int *Bits), returns current value
 348         "getset_metric",        // Get/Set metric - (int *Metric), returns current value
 349         "get_interface",        // Get interface name - (char *Name), returns name length, NULL OK
 350         NULL
 351         };
 352
 353 /**
 354  * \brief IOCtl for /Devices/ip/routes/#
 355  */
 356 int IPStack_Route_IOCtl(tVFS_Node *Node, int ID, void *Data)
 357 {
 358          int    *iData = Data;
 359         tRoute  *rt = Node->ImplPtr;
 360          int    addrSize = IPStack_GetAddressSize(rt->AddressType);
 361
 362         switch(ID)
 363         {
 364         // --- Standard IOCtls (0-3) ---
 365         BASE_IOCTLS(DRV_TYPE_MISC, STR(IDENT), VERSION, casIOCtls_Route)
 366
 367         // Get address type
 368         case 4:
 369                 return rt->AddressType;
 370
 371         // Get Network
 372         case 5:
 373                 if( !CheckMem(Data, addrSize) ) return -1;
 374                 memcpy(Data, rt->Network, addrSize);
 375                 return 1;
 376         // Set Network
 377         case 6:
 378                 if( !CheckMem(Data, addrSize) ) return -1;
 379                 memcpy(rt->Network, Data, addrSize);
 380                 return 1;
 381
 382         // Get Next Hop
 383         case 7:
 384                 if( !CheckMem(Data, addrSize) ) return -1;
 385                 memcpy(Data, rt->NextHop, addrSize);
 386                 return 1;
 387         // Set Next Hop
 388         case 8:
 389                 if( !CheckMem(Data, addrSize) ) return -1;
 390                 memcpy(rt->NextHop, Data, addrSize);
 391                 return 1;
 392
 393         // Get/Set Subnet Bits
 394         case 9:
 395                 if( Data ) {
 396                         if( !CheckMem(Data, sizeof(int)) )      return -1;
 397                         if( *iData < 0 || *iData > addrSize*8 )
 398                                 return -1;
 399                         rt->SubnetBits = *iData;
 400                 }
 401                 return rt->SubnetBits;
 402
 403         // Get/Set Metric
 404         case 10:
 405                 if( Data ) {
 406                         if( !CheckMem(Data, sizeof(int)) )      return -1;
 407                         if( *iData < 0 )        return -1;
 408                         rt->Metric = *iData;
 409                 }
 410                 return rt->Metric;
 411
 412         // Get interface name
 413         case 11:
 414                 if( Data ) {
 415                         if( !CheckMem(Data, strlen(rt->Interface->Name) + 1) )
 416                                 return -1;
 417                         strcpy(Data, rt->Interface->Name);
 418                 }
 419                 return strlen(rt->Interface->Name);
 420
 421         default:
 422                 return -1;
 423         }
 424 }