KernelLand/Modules/IPStack/adapters.c

   1 /*
   2  * Acess2 Networking Stack
   3  * - By John Hodge (thePowersGang)
   4  *
   5  * adapters.c
   6  * - Network Adapter Management
   7  */
   8 #define DEBUG   0
   9 #define VERSION VER2(0,1)
  10 #include "ipstack.h"
  11 #include "include/buffer.h"
  12 #include "include/adapters.h"
  13 #include "include/adapters_int.h"
  14 #include "link.h"
  15 #include <api_drv_common.h>     // For the VFS hack
  16 #include <api_drv_network.h>
  17
  18 // === PROTOTYPES ===
  19 // --- "External" (NIC) API ---
  20 void    *IPStack_Adapter_Add(const tIPStack_AdapterType *Type, void *Ptr, const void *HWAddr);
  21 void    IPStack_Adapter_Del(void *Handle);
  22 // --- VFS API ---
  23  int    Adapter_ReadDir(tVFS_Node *Node, int Pos, char Name[FILENAME_MAX]);
  24 tVFS_Node       *Adapter_FindDir(tVFS_Node *Node, const char *Name);
  25  int    Adapter_DirIOCtl(tVFS_Node *Node, int Num, void *Data);
  26  int    Adapter_IOCtl(tVFS_Node *Node, int Num, void *Data);
  27 // --- "Internal" (IPStack) API ---
  28 tAdapter        *Adapter_GetByName(const char *Name);
  29 void    Adapter_SendPacket(tAdapter *Handle, tIPStackBuffer *Buffer);
  30 // --- Helpers ---
  31 void    Adapter_int_WatchThread(void *Ptr);
  32 tIPStackBuffer  *Adapter_int_LoopbackWaitPacket(void *Unused);
  33  int    Adapter_int_LoopbackSendPacket(void *Unused, tIPStackBuffer *Buffer);
  34
  35 // === GLOBALS ===
  36 // --- VFS Magic ---
  37 tVFS_NodeType   gIP_AdaptersDirType = {
  38         .ReadDir = Adapter_ReadDir,
  39         .FindDir = Adapter_FindDir,
  40         .IOCtl = Adapter_DirIOCtl
  41 };
  42 tVFS_NodeType   gIP_AdapterType = {
  43         // TODO: Should direct IO be allowed?
  44         .IOCtl = Adapter_IOCtl
  45 };
  46 tVFS_Node       gIP_AdaptersNode = {
  47         .Type = &gIP_AdaptersDirType,
  48         .Flags = VFS_FFLAG_DIRECTORY,
  49         .Size = -1
  50 };
  51 // --- Loopback Adapter ---
  52 tIPStack_AdapterType    gIP_LoopAdapterType = {
  53         .Name = "Loopback",
  54         .WaitForPacket = Adapter_int_LoopbackWaitPacket,
  55         .SendPacket = Adapter_int_LoopbackSendPacket
  56         };
  57 tAdapter        gIP_LoopAdapter;
  58 // --- Main adapter list ---
  59 tMutex  glIP_Adapters;
  60 tAdapter        *gpIP_AdapterList;
  61 tAdapter        *gpIP_AdapterList_Last = (void*)&gpIP_AdapterList;      // HACK!
  62  int    giIP_NextAdapterIndex;
  63
  64 // === CODE ===
  65 // --- "External" (NIC) API ---
  66 void *IPStack_Adapter_Add(const tIPStack_AdapterType *Type, void *Ptr, const void *HWAddr)
  67 {
  68         tAdapter        *ret;
  69
  70         ret = malloc(sizeof(tAdapter) + 6);     // TODO: Don't assume 6-byte MAC addresses
  71         ret->Next = NULL;
  72         ret->Type = Type;
  73         ret->CardHandle = Ptr;
  74         ret->RefCount = 0;
  75         ret->Index = giIP_NextAdapterIndex++;
  76         memcpy(ret->HWAddr, HWAddr, 6);
  77
  78         memset(&ret->Node, 0, sizeof(ret->Node));
  79         ret->Node.Type = &gIP_AdapterType;
  80         ret->Node.ImplPtr = ret;
  81
  82         Mutex_Acquire( &glIP_Adapters );
  83         gpIP_AdapterList_Last->Next = ret;
  84         gpIP_AdapterList_Last = ret;
  85         Mutex_Release( &glIP_Adapters );
  86
  87         // Watch the adapter for incoming packets
  88         tTID tid = Proc_SpawnWorker(Adapter_int_WatchThread, ret);
  89         if(tid < 0) {
  90                 Log_Warning("IPStack", "Unable to create watcher thread for %p", ret);
  91         }
  92
  93         return ret;
  94 }
  95
  96 void *IPStack_Adapter_AddVFS(const char *Path)
  97 {
  98          int    fd, tmp;
  99         char    mac[6];
 100
 101         ENTER("sPath", Path);
 102
 103         // Open Device
 104         fd = VFS_Open( Path, VFS_OPENFLAG_READ|VFS_OPENFLAG_WRITE );
 105         if( fd == -1 ) {
 106                 LEAVE('n');
 107                 return NULL;
 108         }
 109
 110         // Check that it is a network interface
 111         tmp = VFS_IOCtl(fd, 0, NULL);
 112         LOG("Device type = %i", tmp);
 113         if( tmp != DRV_TYPE_NETWORK ) {
 114                 Log_Warning("IPStack", "IPStack_Adapter_AddVFS: '%s' is not a network interface", Path);
 115                 VFS_Close( fd );
 116                 LEAVE('n');
 117                 return NULL;
 118         }
 119
 120         // Get MAC Address
 121         VFS_IOCtl(fd, NET_IOCTL_GETMAC, mac);
 122
 123         return IPStack_Adapter_Add(NULL, (void*)(tVAddr)fd, mac);
 124 }
 125
 126 void IPStack_Adapter_Del(void *Handle)
 127 {
 128         Log_Error("IPStack", "TODO: Implement IPStack_Adapter_Del");
 129         // TODO: Allow removing adapters during system operation
 130 }
 131
 132 // --- VFS API ---
 133 int Adapter_ReadDir(tVFS_Node *Node, int Pos, char Dest[FILENAME_MAX])
 134 {
 135         if( Pos < 0 )   return -EINVAL;
 136
 137         // Loopback
 138         if( Pos == 0 ) {
 139                 strcpy(Dest, "lo");
 140                 return 0;
 141         }
 142         Pos --;
 143
 144         #define CHECK_LIST(list, type) do{ \
 145                 tAdapter *a;  int i;\
 146                 for(i=0,a=list; i < Pos && a; i ++, a = a->Next ); \
 147                 if( a ) { \
 148                         strncpy(Dest, Adapter_GetName(a), FILENAME_MAX);\
 149                         return 0;\
 150                 } \
 151                 Pos -= i; \
 152         } while(0);
 153
 154         CHECK_LIST(gpIP_AdapterList, "eth");
 155         // TODO: Support other types of adapters (wifi, tap, ...)
 156
 157         return -EINVAL;
 158 }
 159
 160 tVFS_Node *Adapter_FindDir(tVFS_Node *Node, const char *Name)
 161 {
 162         tAdapter *a = Adapter_GetByName(Name);
 163         if(!a)
 164                 return NULL;
 165         else
 166                 return &a->Node;
 167 }
 168
 169 static const char *casIOCtls_Root[] = { DRV_IOCTLNAMES, "add_vfs_adapter", NULL };
 170 int Adapter_DirIOCtl(tVFS_Node *Node, int Num, void *Data)
 171 {
 172         switch(Num)
 173         {
 174         BASE_IOCTLS(DRV_TYPE_MISC, "IPStack-AdapterList", VERSION, casIOCtls_Root)
 175
 176         case 4:
 177                 if( !CheckString(Data) )
 178                         return -1;
 179
 180                 // Return non-zero if add fails
 181                 return IPStack_Adapter_AddVFS(Data) == NULL;
 182         }
 183         return -1;
 184 }
 185
 186 static const char *casIOCtls_Dev[] = { DRV_IOCTLNAMES, "get_hwaddr", NULL };
 187 int Adapter_IOCtl(tVFS_Node *Node, int Num, void *Data)
 188 {
 189         tAdapter *adapter = Node->ImplPtr;
 190         switch(Num)
 191         {
 192         BASE_IOCTLS(DRV_TYPE_MISC, "IPStack-Adapter", VERSION, casIOCtls_Dev)
 193
 194         case 4:
 195                 if( !CheckMem(Data, 6) )
 196                         return -1;
 197
 198                 memcpy(Data, adapter->HWAddr, 6);
 199                 return 0;
 200         }
 201         return -1;
 202 }
 203
 204 // --- "Internal" (IPStack) API ---
 205 tAdapter *Adapter_GetByName(const char *Name)
 206 {
 207         if( strcmp(Name, "lo") == 0 ) {
 208                 return &gIP_LoopAdapter;
 209         }
 210
 211         if( strncmp(Name, "eth", 3) == 0 )
 212         {
 213                 // Possibly an ethX interface
 214                  int    index, ofs;
 215
 216                 // Get the index at the end
 217                 ofs = ParseInt(Name + 3, &index);
 218                 if( ofs == 0 || Name[3+ofs] != '\0' )
 219                         return NULL;
 220
 221                 // Find the adapter with that index
 222                 for( tAdapter *a = gpIP_AdapterList; a && a->Index <= index; a = a->Next ) {
 223                         if( a->Index == index )
 224                                 return a;
 225                 }
 226
 227                 return NULL;
 228         }
 229
 230         return NULL;
 231 }
 232
 233 char *Adapter_GetName(tAdapter *Adapter)
 234 {
 235         if( Adapter == &gIP_LoopAdapter )
 236         {
 237                 return strdup("lo");
 238         }
 239         else
 240         {
 241                 // TODO: Support multiple adapter types
 242                 char    buf[sizeof("eth")+10];
 243                 sprintf(buf, "eth%i", Adapter->Index);
 244                 return strdup(buf);
 245         }
 246 }
 247
 248 void Adapter_SendPacket(tAdapter *Handle, tIPStackBuffer *Buffer)
 249 {
 250         if( Handle->Type == NULL )
 251         {
 252                 size_t outlen = 0;
 253                 void *data = IPStack_Buffer_CompactBuffer(Buffer, &outlen);
 254                 VFS_Write((tVAddr)Handle->CardHandle, outlen, data);
 255                 free(data);
 256         }
 257         else
 258         {
 259                 Handle->Type->SendPacket( Handle->CardHandle, Buffer );
 260         }
 261 }
 262
 263 // --- Helpers ---
 264 void Adapter_int_WatchThread(void *Ptr)
 265 {
 266         tAdapter        *Adapter = Ptr;
 267         const int       MTU = 1520;
 268         tIPStackBuffer  *buf = NULL;
 269         void    *data = NULL;
 270
 271         if( Adapter->Type == NULL )
 272         {
 273                 data = malloc( MTU );
 274                 buf = IPStack_Buffer_CreateBuffer(1);
 275         }
 276
 277
 278         Threads_SetName("Adapter Watcher");
 279         Log_Log("IPStack", "Thread %i watching eth%i '%s'", Threads_GetTID(), Adapter->Index,
 280                 Adapter->Type?Adapter->Type->Name:"VFS");
 281
 282         for( ;; )
 283         {
 284                 if( Adapter->Type == NULL )
 285                 {
 286                         int len = VFS_Read((tVAddr)Adapter->CardHandle, MTU, data);
 287                         IPStack_Buffer_AppendSubBuffer(buf, len, 0, buf, NULL, NULL);
 288                 }
 289                 else
 290                 {
 291                         buf = Adapter->Type->WaitForPacket( Adapter->CardHandle );
 292                 }
 293
 294                 Link_HandlePacket(Adapter, buf);
 295
 296                 if( Adapter->Type == NULL )
 297                 {
 298                         IPStack_Buffer_ClearBuffer(buf);
 299                 }
 300                 else
 301                 {
 302                         IPStack_Buffer_DestroyBuffer(buf);
 303                 }
 304         }
 305 }
 306
 307 tIPStackBuffer *Adapter_int_LoopbackWaitPacket(void *Unused)
 308 {
 309         Threads_Sleep();
 310         return NULL;
 311 }
 312
 313 int Adapter_int_LoopbackSendPacket(void *Unused, tIPStackBuffer *Buffer)
 314 {
 315         // This is a little hacky :)
 316         Link_HandlePacket(&gIP_LoopAdapter, Buffer);
 317         return 0;
 318 }
 319
 320 // --- Broadcast Debugging ---
 321 extern Uint16   IPv4_Checksum(const void *Buf, size_t Length);
 322 void IPStack_SendDebugText(const char *Text)
 323 {
 324         const Uint8     pkt_hdr[] = {
 325                 0xFF,0xFF, 0xFF,0xFF, 0xFF,0xFF,
 326                 0x00,0x00, 0x00,0x00, 0x00,0x00,
 327                 0x08,0x00,
 328
 329                 0x45,0x00,      // Version/Length, DiffServices
 330                 0xFF,0xFF,      // Total Length
 331                 0x00,0x00,      // Identifcation
 332                 0x00,0x00, 0xFF,0x11,   // Flags,Fragment, TTL=255,proto=UDP
 333                 0x00,0x00,      // Header checksum
 334                 0x00,0x00,0x00,0x00,    // Source
 335                 0xFF,0xFF,0xFF,0xFF,    // Destination
 336
 337                 0x80,0x00, 0x80,0x00,
 338                 0xFF,0xFF, 0xFF,0xFF,
 339         };
 340         static tShortSpinlock   lLock;
 341
 342         // Fast return if there's no avaliable adapters
 343         if( !gpIP_AdapterList )
 344                 return ;
 345
 346         if( CPU_HAS_LOCK(&lLock) )
 347                 return ;        // Nested!
 348         SHORTLOCK(&lLock);
 349         #if ARCHDIR_is_x86
 350         __asm__ __volatile__ ("sti");   // Start interrupts (x86 specific)
 351         #endif
 352
 353         // Cache packets until a newline
 354         static char     cache[1500 - (sizeof(pkt_hdr) + 4)];
 355         static int      cache_len;
 356
 357          int    len = strlen(Text);
 358
 359         // Append to cache
 360         strncpy(cache + cache_len, Text, sizeof(cache) - cache_len);
 361         cache_len += len;
 362         // TODO: Detect overflows.
 363
 364         // If there's no newline, only buffer
 365         if( strpos(Text, '\n') == -1 ) {
 366                 SHORTREL(&lLock);
 367                 return ;
 368         }
 369
 370         // Build packet
 371          int    link_checksum_ofs = sizeof(pkt_hdr) + cache_len;
 372         char    buffer[sizeof(pkt_hdr) + cache_len + 4];
 373
 374         memcpy(buffer, pkt_hdr, sizeof(pkt_hdr));
 375         memcpy(buffer + sizeof(pkt_hdr), cache, cache_len);
 376
 377         ((Uint16*)buffer)[(14+2)/2] = BigEndian16( sizeof(pkt_hdr)-14 + cache_len );    // IP Size
 378         ((Uint16*)buffer)[(14+10)/2] = BigEndian16( 0 );        // IP Header
 379         ((Uint16*)buffer)[(14+20+4)/2] = BigEndian16( 8+cache_len );    // UDP Size
 380         ((Uint16*)buffer)[(14+20+6)/2] = BigEndian16( 0 );      // UDP Checksum
 381 //      *(Uint32*)&buffer[link_checksum_ofs] = BigEndian32( 0 );        // 802.3 checksum?
 382         // TODO: Calculate checksums
 383         ((Uint16*)buffer)[(14+10)/2] = BigEndian16( IPv4_Checksum(buffer+14,20) );      // IP Header
 384
 385         // Create buffer
 386         tIPStackBuffer  *buf = IPStack_Buffer_CreateBuffer(1);
 387         IPStack_Buffer_AppendSubBuffer(buf, link_checksum_ofs+4, 0, buffer, NULL, NULL);
 388
 389         // Send 'er off
 390         for( tAdapter *a = gpIP_AdapterList; a; a = a->Next )
 391         {
 392                 a->Type->SendPacket( a->CardHandle, buf );
 393         }
 394
 395         IPStack_Buffer_DestroyBuffer(buf);
 396
 397         cache_len = 0;
 398
 399         SHORTREL(&lLock);
 400 }
 401