KernelLand/Modules/IPStack/interface.c

   1 /*
   2  * Acess2 IP Stack
   3  * - Interface Control
   4  */
   5 #define DEBUG   0
   6 #define VERSION VER2(0,10)
   7 #include "ipstack.h"
   8 #include "link.h"
   9 #include <api_drv_common.h>
  10 #include "include/adapters.h"
  11
  12 // === CONSTANTS ===
  13 //! Default timeout value, 30 seconds
  14 #define DEFAULT_TIMEOUT (30*1000)
  15
  16 // === IMPORTS ===
  17 extern int      IPv4_Ping(tInterface *Iface, tIPv4 Addr);
  18 //extern int    IPv6_Ping(tInterface *Iface, tIPv6 Addr);
  19 extern tVFS_Node        gIP_RouteNode;
  20 extern tVFS_Node        gIP_AdaptersNode;
  21
  22 // === PROTOTYPES ===
  23 char    *IPStack_Root_ReadDir(tVFS_Node *Node, int Pos);
  24 tVFS_Node       *IPStack_Root_FindDir(tVFS_Node *Node, const char *Name);
  25  int    IPStack_Root_IOCtl(tVFS_Node *Node, int ID, void *Data);
  26
  27  int    IPStack_AddFile(tSocketFile *File);
  28 tInterface      *IPStack_AddInterface(const char *Device, const char *Name);
  29
  30 char    *IPStack_Iface_ReadDir(tVFS_Node *Node, int Pos);
  31 tVFS_Node       *IPStack_Iface_FindDir(tVFS_Node *Node, const char *Name);
  32  int    IPStack_Iface_IOCtl(tVFS_Node *Node, int ID, void *Data);
  33
  34 // === GLOBALS ===
  35 tVFS_NodeType   gIP_InterfaceNodeType = {
  36                 .ReadDir = IPStack_Iface_ReadDir,
  37                 .FindDir = IPStack_Iface_FindDir,
  38                 .IOCtl = IPStack_Iface_IOCtl
  39 };
  40 //! Loopback (127.0.0.0/8, ::1) Pseudo-Interface
  41 tInterface      gIP_LoopInterface = {
  42         .Node = {
  43                 .ImplPtr = &gIP_LoopInterface,
  44                 .Flags = VFS_FFLAG_DIRECTORY,
  45                 .Size = -1,
  46                 .NumACLs = 1,
  47                 .ACLs = &gVFS_ACL_EveryoneRX,
  48                 .Type = &gIP_InterfaceNodeType
  49         },
  50         .Adapter = NULL,
  51         .Type = 0
  52 };
  53 tShortSpinlock  glIP_Interfaces;
  54 tInterface      *gIP_Interfaces = NULL;
  55 tInterface      *gIP_Interfaces_Last = NULL;
  56  int    giIP_NextIfaceId = 1;
  57
  58 tSocketFile     *gIP_FileTemplates;
  59
  60 // === CODE ===
  61
  62 /**
  63  * \brief Read from the IP Stack's Device Directory
  64  */
  65 char *IPStack_Root_ReadDir(tVFS_Node *Node, int Pos)
  66 {
  67         tInterface      *iface;
  68         char    *name;
  69         ENTER("pNode iPos", Node, Pos);
  70
  71
  72         // Routing Subdir
  73         if( Pos == 0 ) {
  74                 LEAVE('s', "routes");
  75                 return strdup("routes");
  76         }
  77         // Adapters
  78         if( Pos == 1 ) {
  79                 LEAVE('s', "adapters");
  80                 return strdup("adapters");
  81         }
  82         // Pseudo Interfaces
  83         if( Pos == 2 ) {
  84                 LEAVE('s', "lo");
  85                 return strdup("lo");
  86         }
  87         Pos -= 3;
  88
  89         // Traverse the list
  90         for( iface = gIP_Interfaces; iface && Pos--; iface = iface->Next ) ;
  91
  92         // Did we run off the end?
  93         if(!iface) {
  94                 LEAVE('n');
  95                 return NULL;
  96         }
  97
  98         name = malloc(4);
  99         if(!name) {
 100                 Log_Warning("IPStack", "IPStack_Root_ReadDir - malloc error");
 101                 LEAVE('n');
 102                 return NULL;
 103         }
 104
 105         // Create the name
 106         Pos = iface->Node.ImplInt;
 107         if(Pos < 10) {
 108                 name[0] = '0' + Pos;
 109                 name[1] = '\0';
 110         }
 111         else if(Pos < 100) {
 112                 name[0] = '0' + Pos/10;
 113                 name[1] = '0' + Pos%10;
 114                 name[2] = '\0';
 115         }
 116         else {
 117                 name[0] = '0' + Pos/100;
 118                 name[1] = '0' + (Pos/10)%10;
 119                 name[2] = '0' + Pos%10;
 120                 name[3] = '\0';
 121         }
 122
 123         LEAVE('s', name);
 124         // Return the pre-generated name
 125         return name;
 126 }
 127
 128 /**
 129  * \brief Get the node of an interface
 130  */
 131 tVFS_Node *IPStack_Root_FindDir(tVFS_Node *Node, const char *Name)
 132 {
 133         #if 0
 134          int    i, num;
 135         #endif
 136         tInterface      *iface;
 137
 138         ENTER("pNode sName", Node, Name);
 139
 140         // Routing subdir
 141         if( strcmp(Name, "routes") == 0 ) {
 142                 LEAVE('p', &gIP_RouteNode);
 143                 return &gIP_RouteNode;
 144         }
 145
 146         // Adapters subdir
 147         if( strcmp(Name, "adapters") == 0 ) {
 148                 LEAVE('p', &gIP_AdaptersNode);
 149                 return &gIP_AdaptersNode;
 150         }
 151
 152         // Loopback
 153         if( strcmp(Name, "lo") == 0 ) {
 154                 LEAVE('p', &gIP_LoopInterface.Node);
 155                 return &gIP_LoopInterface.Node;
 156         }
 157
 158         for( iface = gIP_Interfaces; iface; iface = iface->Next )
 159         {
 160                 if( strcmp(iface->Name, Name) == 0 )
 161                 {
 162                         LEAVE('p', &iface->Node);
 163                         return &iface->Node;
 164                 }
 165         }
 166
 167         LEAVE('p', NULL);
 168         return NULL;
 169 }
 170
 171 static const char *casIOCtls_Root[] = { DRV_IOCTLNAMES, "add_interface", NULL };
 172 /**
 173  * \brief Handles IOCtls for the IPStack root
 174  */
 175 int IPStack_Root_IOCtl(tVFS_Node *Node, int ID, void *Data)
 176 {
 177          int    tmp;
 178         ENTER("pNode iID pData", Node, ID, Data);
 179
 180         switch(ID)
 181         {
 182         // --- Standard IOCtls (0-3) ---
 183         BASE_IOCTLS(DRV_TYPE_MISC, "IPStack", VERSION, casIOCtls_Root)
 184
 185         /*
 186          * add_interface
 187          * - Adds a new IP interface and binds it to a device
 188          */
 189         case 4:
 190                 if( Threads_GetUID() != 0 )     LEAVE_RET('i', -1);
 191                 if( !CheckString( Data ) )      LEAVE_RET('i', -1);
 192                 LOG("New interface for '%s'", Data);
 193                 {
 194                         char    name[4] = "";
 195                         tInterface      *iface = IPStack_AddInterface(Data, name);
 196                         if(iface == NULL)       LEAVE_RET('i', -1);
 197                         tmp = iface->Node.ImplInt;
 198                 }
 199                 LEAVE_RET('i', tmp);
 200         }
 201         LEAVE('i', 0);
 202         return 0;
 203 }
 204
 205 /**
 206  * \fn tInterface *IPStack_AddInterface(char *Device)
 207  * \brief Adds an interface to the list
 208  */
 209 tInterface *IPStack_AddInterface(const char *Device, const char *Name)
 210 {
 211         tInterface      *iface;
 212         tAdapter        *card;
 213          int    nameLen;
 214
 215         ENTER("sDevice", Device);
 216
 217         card = Adapter_GetByName(Device);
 218         if( !card ) {
 219                 Log_Debug("IPStack", "Unable to open card '%s'", Device);
 220                 LEAVE('n');
 221                 return NULL;    // ERR_YOURBAD
 222         }
 223
 224         nameLen = sprintf(NULL, "%i", giIP_NextIfaceId);
 225
 226         iface = malloc(
 227                 sizeof(tInterface)
 228                 + nameLen + 1
 229                 + IPStack_GetAddressSize(-1)*3  // Address, Route->Network, Route->NextHop
 230                 );
 231         if(!iface) {
 232                 Log_Warning("IPStack", "AddInterface - malloc() failed");
 233                 LEAVE('n');
 234                 return NULL;    // Return ERR_MYBAD
 235         }
 236
 237         iface->Next = NULL;
 238         iface->Type = 0;        // Unset type
 239         iface->Address = iface->Name + nameLen + 1;     // Address
 240         iface->Route.Network = iface->Address + IPStack_GetAddressSize(-1);
 241         iface->Route.NextHop = iface->Route.Network + IPStack_GetAddressSize(-1);
 242
 243         // Create Node
 244         iface->Node.ImplPtr = iface;
 245         iface->Node.Flags = VFS_FFLAG_DIRECTORY;
 246         iface->Node.Size = -1;
 247         iface->Node.NumACLs = 1;
 248         iface->Node.ACLs = &gVFS_ACL_EveryoneRX;
 249         iface->Node.Type = &gIP_InterfaceNodeType;
 250
 251         // Set Defaults
 252         iface->TimeoutDelay = DEFAULT_TIMEOUT;
 253
 254         // Get adapter handle
 255         iface->Adapter = card;
 256
 257         // Delay setting ImplInt until after the adapter is opened
 258         // Keeps things simple
 259         iface->Node.ImplInt = giIP_NextIfaceId++;
 260         sprintf(iface->Name, "%i", (int)iface->Node.ImplInt);
 261
 262         // Append to list
 263         SHORTLOCK( &glIP_Interfaces );
 264         if( gIP_Interfaces ) {
 265                 gIP_Interfaces_Last->Next = iface;
 266                 gIP_Interfaces_Last = iface;
 267         }
 268         else {
 269                 gIP_Interfaces = iface;
 270                 gIP_Interfaces_Last = iface;
 271         }
 272         SHORTREL( &glIP_Interfaces );
 273
 274 //      gIP_DriverInfo.RootNode.Size ++;
 275
 276         // Success!
 277         LEAVE('p', iface);
 278         return iface;
 279 }
 280
 281 /**
 282  * \brief Adds a file to the socket list
 283  */
 284 int IPStack_AddFile(tSocketFile *File)
 285 {
 286         Log_Log("IPStack", "Added file '%s'", File->Name);
 287         File->Next = gIP_FileTemplates;
 288         gIP_FileTemplates = File;
 289         return 0;
 290 }
 291
 292 // ---
 293 // VFS Functions
 294 // ---
 295 /**
 296  * \brief Read from an interface's directory
 297  */
 298 char *IPStack_Iface_ReadDir(tVFS_Node *Node, int Pos)
 299 {
 300         tSocketFile     *file = gIP_FileTemplates;
 301         while(Pos-- && file) {
 302                 file = file->Next;
 303         }
 304
 305         if(!file)       return NULL;
 306
 307         return strdup(file->Name);
 308 }
 309
 310 /**
 311  * \brief Gets a named node from an interface directory
 312  */
 313 tVFS_Node *IPStack_Iface_FindDir(tVFS_Node *Node, const char *Name)
 314 {
 315         tSocketFile     *file = gIP_FileTemplates;
 316
 317         // Get file definition
 318         for(;file;file = file->Next)
 319         {
 320                 if( strcmp(file->Name, Name) == 0 )     break;
 321         }
 322         if(!file)       return NULL;
 323
 324         // Pass the buck!
 325         return file->Init(Node->ImplPtr);
 326 }
 327
 328 /**
 329  * \brief Names for interface IOCtl Calls
 330  */
 331 static const char *casIOCtls_Iface[] = {
 332         DRV_IOCTLNAMES,
 333         "getset_type",
 334         "get_address", "set_address",
 335         "getset_subnet",
 336         "get_device",
 337         "ping",
 338         NULL
 339         };
 340 /**
 341  * \brief Handles IOCtls for the IPStack interfaces
 342  */
 343 int IPStack_Iface_IOCtl(tVFS_Node *Node, int ID, void *Data)
 344 {
 345          int    tmp, size;
 346         tInterface      *iface = (tInterface*)Node->ImplPtr;
 347         ENTER("pNode iID pData", Node, ID, Data);
 348
 349         switch(ID)
 350         {
 351         // --- Standard IOCtls (0-3) ---
 352         BASE_IOCTLS(DRV_TYPE_MISC, "IPStack", VERSION, casIOCtls_Iface)
 353
 354         /*
 355          * getset_type
 356          * - Get/Set the interface type
 357          */
 358         case 4:
 359                 // Set Type?
 360                 if( Data )
 361                 {
 362                         // Ok, it's set type
 363                         if( Threads_GetUID() != 0 ) {
 364                                 LOG("Attempt by non-root to alter an interface (%i)", Threads_GetUID());
 365                                 LEAVE('i', -1);
 366                                 return -1;
 367                         }
 368                         if( !CheckMem( Data, sizeof(int) ) ) {
 369                                 LOG("Invalid pointer %p", Data);
 370                                 LEAVE('i', -1);
 371                                 return -1;
 372                         }
 373
 374                         // Set type
 375                         iface->Type = *(int*)Data;
 376                         LOG("Interface type set to %i", iface->Type);
 377                         size = IPStack_GetAddressSize(iface->Type);
 378                         // Check it's actually valid
 379                         if( iface->Type != 0 && size == 0 ) {
 380                                 iface->Type = 0;
 381                                 LEAVE('i', -1);
 382                                 return -1;
 383                         }
 384
 385                         // Clear address
 386                         memset(iface->Address, 0, size);
 387                 }
 388                 LEAVE('i', iface->Type);
 389                 return iface->Type;
 390
 391         /*
 392          * get_address
 393          * - Get the interface's address
 394          */
 395         case 5:
 396                 size = IPStack_GetAddressSize(iface->Type);
 397                 if( !CheckMem( Data, size ) )   LEAVE_RET('i', -1);
 398                 memcpy( Data, iface->Address, size );
 399                 LEAVE('i', 1);
 400                 return 1;
 401
 402         /*
 403          * set_address
 404          * - Set the interface's address
 405          */
 406         case 6:
 407                 if( Threads_GetUID() != 0 )     LEAVE_RET('i', -1);
 408
 409                 size = IPStack_GetAddressSize(iface->Type);
 410                 if( !CheckMem( Data, size ) )   LEAVE_RET('i', -1);
 411                 // TODO: Protect against trashing
 412                 LOG("Interface address set to '%s'", IPStack_PrintAddress(iface->Type, Data));
 413                 memcpy( iface->Address, Data, size );
 414                 LEAVE_RET('i', 1);
 415
 416         /*
 417          * getset_subnet
 418          * - Get/Set the bits in the address subnet
 419          */
 420         case 7:
 421                 // Do we want to set the value?
 422                 if( Data )
 423                 {
 424                         // Are we root? (TODO: Check Owner/Group)
 425                         if( Threads_GetUID() != 0 )     LEAVE_RET('i', -1);
 426                         // Is the memory valid
 427                         if( !CheckMem(Data, sizeof(int)) )      LEAVE_RET('i', -1);
 428
 429                         // Is the mask sane?
 430                         if( *(int*)Data < 0 || *(int*)Data > IPStack_GetAddressSize(iface->Type)*8-1 )
 431                                 LEAVE_RET('i', -1);
 432                         LOG("Set subnet bits to %i", *(int*)Data);
 433                         // Ok, set it
 434                         iface->SubnetBits = *(int*)Data;
 435                 }
 436                 LEAVE_RET('i', iface->SubnetBits);
 437
 438         /*
 439          * get_device
 440          * - Gets the name of the attached device
 441          */
 442         case 8:
 443                 if( iface->Adapter == NULL )
 444                         LEAVE_RET('i', 0);
 445                 char *name = Adapter_GetName(iface->Adapter);
 446                  int len = strlen(name);
 447                 if( Data ) {
 448                         if( !CheckMem( Data, len+1 ) ) {
 449                                 free(name);
 450                                 LEAVE_RET('i', -1);
 451                         }
 452                         strcpy( Data, name );
 453                 }
 454                 free(name);
 455                 LEAVE_RET('i', len);
 456
 457         /*
 458          * ping
 459          * - Send an ICMP Echo
 460          */
 461         case 9:
 462                 switch(iface->Type)
 463                 {
 464                 case 0:
 465                         LEAVE_RET('i', 1);
 466
 467                 case 4:
 468                         if( !CheckMem( Data, sizeof(tIPv4) ) )  LEAVE_RET('i', -1);
 469                         tmp = IPv4_Ping(iface, *(tIPv4*)Data);
 470                         LEAVE_RET('i', tmp);
 471
 472                 case 6:
 473                         LEAVE_RET('i', 1);
 474                 }
 475                 break;
 476
 477         }
 478
 479         LEAVE('i', 0);
 480         return 0;
 481 }
 482