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 // === IMPORTS ===
  13 tVFS_Node       *IPStack_Root_FindDir(tVFS_Node *Node, const char *Filename);
  14
  15 // === PROTOTYPES ===
  16 // - Routes directory
  17 char    *IPStack_RouteDir_ReadDir(tVFS_Node *Node, int Pos);
  18 tVFS_Node       *IPStack_RouteDir_FindDir(tVFS_Node *Node, const char *Name);
  19  int    IPStack_RouteDir_IOCtl(tVFS_Node *Node, int ID, void *Data);
  20  int    IPStack_Route_Create(const char *InterfaceName);
  21 tRoute  *IPStack_FindRoute(int AddressType, void *Address);
  22 // - Individual Routes
  23  int    IPStack_Route_IOCtl(tVFS_Node *Node, int ID, void *Data);
  24
  25 // === GLOBALS ===
  26  int    giIP_NextRouteId = 1;
  27 tRoute  *gIP_Routes;
  28 tRoute  *gIP_RoutesEnd;
  29 tVFS_Node       gIP_RouteNode = {
  30         Flags: VFS_FFLAG_DIRECTORY,
  31         Size: -1,
  32         NumACLs: 1,
  33         ACLs: &gVFS_ACL_EveryoneRX,
  34         ReadDir: IPStack_RouteDir_ReadDir,
  35         FindDir: IPStack_RouteDir_FindDir,
  36         IOCtl: IPStack_RouteDir_IOCtl
  37 };
  38
  39 // === CODE ===
  40 /**
  41  * \brief ReadDir for the /Devices/ip/routes/ directory
  42  */
  43 char *IPStack_RouteDir_ReadDir(tVFS_Node *Node, int Pos)
  44 {
  45         tRoute  *rt;
  46
  47         for(rt = gIP_Routes; rt && Pos --; rt = rt->Next);
  48
  49         if( !rt ) {
  50                 return NULL;
  51         }
  52
  53         {
  54                  int    len = sprintf(NULL, "%i", rt->Node.Inode);
  55                 char    buf[len+1];
  56                 sprintf(buf, "%i", rt->Node.Inode);
  57                 return strdup(buf);
  58         }
  59 }
  60
  61 /**
  62  * \brief FindDir for the /Devices/ip/routes/ directory
  63  */
  64 tVFS_Node *IPStack_RouteDir_FindDir(tVFS_Node *Node, const char *Name)
  65 {
  66          int    num = atoi(Name);
  67         tRoute  *rt;
  68
  69         // Zero is invalid, sorry :)
  70         if( !num )      return NULL;
  71
  72         // The list is inherently sorted, so we can do a quick search
  73         for(rt = gIP_Routes; rt && rt->Node.Inode < num; rt = rt->Next);
  74         // Fast fail on larger number
  75         if( rt->Node.Inode > num )
  76                 return NULL;
  77
  78         return &rt->Node;
  79 }
  80
  81 /**
  82  * \brief Names for the route list IOCtl Calls
  83  */
  84 static const char *casIOCtls_RouteDir[] = {
  85         DRV_IOCTLNAMES,
  86         "add_route",    // Add a route - char *InterfaceName
  87         "locate_route", // Find the best route for an address - struct {int Type, char Address[]} *
  88         NULL
  89         };
  90
  91 /**
  92  * \brief IOCtl for /Devices/ip/routes/
  93  */
  94 int IPStack_RouteDir_IOCtl(tVFS_Node *Node, int ID, void *Data)
  95 {
  96          int    tmp;
  97         switch(ID)
  98         {
  99         // --- Standard IOCtls (0-3) ---
 100         case DRV_IOCTL_TYPE:
 101                 LEAVE('i', DRV_TYPE_MISC);
 102                 return DRV_TYPE_MISC;
 103
 104         case DRV_IOCTL_IDENT:
 105                 tmp = ModUtil_SetIdent(Data, STR(IDENT));
 106                 LEAVE('i', 1);
 107                 return 1;
 108
 109         case DRV_IOCTL_VERSION:
 110                 LEAVE('x', VERSION);
 111                 return VERSION;
 112
 113         case DRV_IOCTL_LOOKUP:
 114                 tmp = ModUtil_LookupString( (char**)casIOCtls_RouteDir, (char*)Data );
 115                 LEAVE('i', tmp);
 116                 return tmp;
 117
 118         case 4: // Add Route
 119                 if( !CheckString(Data) )        return -1;
 120                 return IPStack_Route_Create(Data);
 121
 122         case 5: // Locate Route
 123                 {
 124                         struct {
 125                                  int    Type;
 126                                 Uint8   Addr[];
 127                         }       *data = Data;
 128                         tRoute  *rt;
 129
 130                         if( !CheckMem(Data, sizeof(int)) )
 131                                 return -1;
 132                         if( !CheckMem(Data, sizeof(int) + IPStack_GetAddressSize(data->Type)) )
 133                                 return -1;
 134
 135                         rt = IPStack_FindRoute(data->Type, data->Addr);
 136
 137                         if( !rt )
 138                                 return 0;
 139
 140                         return rt->Node.Inode;
 141                 }
 142                 break;
 143         }
 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 int 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 )     return 0;
 162                 iface = node->ImplPtr;
 163         }
 164
 165         // Get the size of the specified address type
 166         size = IPStack_GetAddressSize(iface->Type);
 167         if( size == 0 ) {
 168                 return 0;
 169         }
 170
 171         // Allocate space
 172         rt = calloc(1, sizeof(tRoute) + size*2 );
 173
 174         // Set up node
 175         rt->Node.ImplPtr = rt;
 176         rt->Node.Inode = giIP_NextRouteId ++;
 177         rt->Node.Size = 0;
 178         rt->Node.NumACLs = 1,
 179         rt->Node.ACLs = &gVFS_ACL_EveryoneRO;
 180         rt->Node.IOCtl = IPStack_Route_IOCtl;
 181
 182         // Set up state
 183         rt->AddressType = iface->Type;
 184         rt->Network = (void *)( (tVAddr)rt + sizeof(tRoute) );
 185         rt->SubnetBits = 0;
 186         rt->NextHop = (void *)( (tVAddr)rt + sizeof(tRoute) + size );
 187         rt->Interface = iface;
 188
 189         // Add to list
 190         if( gIP_RoutesEnd ) {
 191                 gIP_RoutesEnd->Next = rt;
 192                 gIP_RoutesEnd = rt;
 193         }
 194         else {
 195                 gIP_Routes = gIP_RoutesEnd = rt;
 196         }
 197
 198         return rt->Node.Inode;
 199 }
 200
 201 /**
 202  */
 203 tRoute  *IPStack_FindRoute(int AddressType, void *Address)
 204 {
 205         tRoute  *rt;
 206         tRoute  *best = NULL;
 207
 208         for( rt = gIP_Routes; rt; rt = rt->Next )
 209         {
 210                 if( rt->AddressType != AddressType )    continue;
 211
 212                 if( !IPStack_CompareAddress(AddressType, rt->Network, Address, rt->SubnetBits) )
 213                         continue;
 214
 215                 if( best ) {
 216                         // More direct routes are preferred
 217                         if( best->SubnetBits > rt->SubnetBits ) continue;
 218                         // If equally direct, choose the best metric
 219                         if( best->SubnetBits == rt->SubnetBits && best->Metric < rt->Metric )   continue;
 220                 }
 221
 222                 best = rt;
 223         }
 224
 225         return best;
 226 }
 227
 228 /**
 229  * \brief Names for route IOCtl Calls
 230  */
 231 static const char *casIOCtls_Route[] = {
 232         DRV_IOCTLNAMES,
 233         "get_network",  // Get network - (void *Data), returns boolean success
 234         "set_network",  // Set network - (void *Data), returns boolean success
 235         "get_nexthop",  // Get next hop - (void *Data), returns boolean success
 236         "set_nexthop",  // Set next hop - (void *Data), returns boolean success
 237         "getset_subnetbits",    // Get/Set subnet bits - (int *Bits), returns current value
 238         "getset_metric",        // Get/Set metric - (int *Metric), returns current value
 239         "get_interface",        // Get interface name - (char *Name), returns name length, NULL OK
 240         NULL
 241         };
 242
 243 /**
 244  * \brief IOCtl for /Devices/ip/routes/#
 245  */
 246 int IPStack_Route_IOCtl(tVFS_Node *Node, int ID, void *Data)
 247 {
 248          int    tmp;
 249          int    *iData = Data;
 250         tRoute  *rt = Node->ImplPtr;
 251          int    addrSize = IPStack_GetAddressSize(rt->AddressType);
 252
 253         switch(ID)
 254         {
 255         // --- Standard IOCtls (0-3) ---
 256         case DRV_IOCTL_TYPE:
 257                 LEAVE('i', DRV_TYPE_MISC);
 258                 return DRV_TYPE_MISC;
 259
 260         case DRV_IOCTL_IDENT:
 261                 tmp = ModUtil_SetIdent(Data, STR(IDENT));
 262                 LEAVE('i', 1);
 263                 return 1;
 264
 265         case DRV_IOCTL_VERSION:
 266                 LEAVE('x', VERSION);
 267                 return VERSION;
 268
 269         case DRV_IOCTL_LOOKUP:
 270                 tmp = ModUtil_LookupString( (char**)casIOCtls_Route, (char*)Data );
 271                 LEAVE('i', tmp);
 272                 return tmp;
 273
 274         // Get Network
 275         case 4:
 276                 if( !CheckMem(Data, addrSize) ) return -1;
 277                 memcpy(Data, rt->Network, addrSize);
 278                 return 1;
 279         // Set Network
 280         case 5:
 281                 if( !CheckMem(Data, addrSize) ) return -1;
 282                 memcpy(rt->Network, Data, addrSize);
 283                 return 1;
 284
 285         // Get Next Hop
 286         case 6:
 287                 if( !CheckMem(Data, addrSize) ) return -1;
 288                 memcpy(Data, rt->NextHop, addrSize);
 289                 return 1;
 290         // Set Next Hop
 291         case 7:
 292                 if( !CheckMem(Data, addrSize) ) return -1;
 293                 memcpy(rt->NextHop, Data, addrSize);
 294                 return 1;
 295
 296         // Get/Set Subnet Bits
 297         case 8:
 298                 if( Data ) {
 299                         if( !CheckMem(Data, sizeof(int)) )      return -1;
 300                         if( *iData < 0 || *iData > addrSize*8 )
 301                                 return -1;
 302                         rt->SubnetBits = *iData;
 303                 }
 304                 return rt->SubnetBits;
 305
 306         // Get/Set Metric
 307         case 9:
 308                 if( Data ) {
 309                         if( !CheckMem(Data, sizeof(int)) )      return -1;
 310                         if( *iData < 0 )        return -1;
 311                         rt->Metric = *iData;
 312                 }
 313                 return rt->Metric;
 314
 315         // Get interface name
 316         case 10:
 317                 if( Data ) {
 318                         if( !CheckMem(Data, strlen(rt->Interface->Name) + 1) )
 319                                 return -1;
 320                         strcpy(Data, rt->Interface->Name);
 321                 }
 322                 return strlen(rt->Interface->Name);
 323
 324         default:
 325                 return 0;
 326         }
 327 }