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 char    *Adapter_ReadDir(tVFS_Node *Node, int Pos);
  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 char *Adapter_ReadDir(tVFS_Node *Node, int Pos)
 134 {
 135         if( Pos < 0 )   return NULL;
 136
 137         // Loopback
 138         if( Pos == 0 ) {
 139                 return strdup("lo");
 140         }
 141         Pos --;
 142
 143         #define CHECK_LIST(list, type) do{ \
 144                 tAdapter *a;  int i;\
 145                 for(i=0,a=list; i < Pos && a; i ++, a = a->Next ); \
 146                 if( a ) { \
 147                         return Adapter_GetName(a);\
 148                 } \
 149                 Pos -= i; \
 150         } while(0);
 151
 152         CHECK_LIST(gpIP_AdapterList, "eth");
 153         // TODO: Support other types of adapters (wifi, tap, ...)
 154
 155         return NULL;
 156 }
 157
 158 tVFS_Node *Adapter_FindDir(tVFS_Node *Node, const char *Name)
 159 {
 160         tAdapter *a = Adapter_GetByName(Name);
 161         if(!a)
 162                 return NULL;
 163         else
 164                 return &a->Node;
 165 }
 166
 167 static const char *casIOCtls_Root[] = { DRV_IOCTLNAMES, "add_vfs_adapter", NULL };
 168 int Adapter_DirIOCtl(tVFS_Node *Node, int Num, void *Data)
 169 {
 170         switch(Num)
 171         {
 172         BASE_IOCTLS(DRV_TYPE_MISC, "IPStack-AdapterList", VERSION, casIOCtls_Root)
 173
 174         case 4:
 175                 if( !CheckString(Data) )
 176                         return -1;
 177
 178                 // Return non-zero if add fails
 179                 return IPStack_Adapter_AddVFS(Data) == NULL;
 180         }
 181         return -1;
 182 }
 183
 184 static const char *casIOCtls_Dev[] = { DRV_IOCTLNAMES, "get_hwaddr", NULL };
 185 int Adapter_IOCtl(tVFS_Node *Node, int Num, void *Data)
 186 {
 187         tAdapter *adapter = Node->ImplPtr;
 188         switch(Num)
 189         {
 190         BASE_IOCTLS(DRV_TYPE_MISC, "IPStack-Adapter", VERSION, casIOCtls_Dev)
 191
 192         case 4:
 193                 if( !CheckMem(Data, 6) )
 194                         return -1;
 195
 196                 memcpy(Data, adapter->HWAddr, 6);
 197                 return 0;
 198         }
 199         return -1;
 200 }
 201
 202 // --- "Internal" (IPStack) API ---
 203 tAdapter *Adapter_GetByName(const char *Name)
 204 {
 205         if( strcmp(Name, "lo") == 0 ) {
 206                 return &gIP_LoopAdapter;
 207         }
 208
 209         if( strncmp(Name, "eth", 3) == 0 )
 210         {
 211                 // Possibly an ethX interface
 212                  int    index, ofs;
 213
 214                 // Get the index at the end
 215                 ofs = ParseInt(Name + 3, &index);
 216                 if( ofs == 0 || Name[3+ofs] != '\0' )
 217                         return NULL;
 218
 219                 // Find the adapter with that index
 220                 for( tAdapter *a = gpIP_AdapterList; a && a->Index <= index; a = a->Next ) {
 221                         if( a->Index == index )
 222                                 return a;
 223                 }
 224
 225                 return NULL;
 226         }
 227
 228         return NULL;
 229 }
 230
 231 char *Adapter_GetName(tAdapter *Adapter)
 232 {
 233         if( Adapter == &gIP_LoopAdapter )
 234         {
 235                 return strdup("lo");
 236         }
 237         else
 238         {
 239                 // TODO: Support multiple adapter types
 240                 char    buf[sizeof("eth")+10];
 241                 sprintf(buf, "eth%i", Adapter->Index);
 242                 return strdup(buf);
 243         }
 244 }
 245
 246 void Adapter_SendPacket(tAdapter *Handle, tIPStackBuffer *Buffer)
 247 {
 248         if( Handle->Type == NULL )
 249         {
 250                 size_t outlen = 0;
 251                 void *data = IPStack_Buffer_CompactBuffer(Buffer, &outlen);
 252                 VFS_Write((tVAddr)Handle->CardHandle, outlen, data);
 253                 free(data);
 254         }
 255         else
 256         {
 257                 Handle->Type->SendPacket( Handle->CardHandle, Buffer );
 258         }
 259 }
 260
 261 // --- Helpers ---
 262 void Adapter_int_WatchThread(void *Ptr)
 263 {
 264         tAdapter        *Adapter = Ptr;
 265         const int       MTU = 1520;
 266         tIPStackBuffer  *buf = NULL;
 267         void    *data = NULL;
 268
 269         if( Adapter->Type == NULL )
 270         {
 271                 data = malloc( MTU );
 272                 buf = IPStack_Buffer_CreateBuffer(1);
 273         }
 274
 275
 276         Threads_SetName("Adapter Watcher");
 277         Log_Log("IPStack", "Thread %i watching eth%i '%s'", Threads_GetTID(), Adapter->Index,
 278                 Adapter->Type?Adapter->Type->Name:"VFS");
 279
 280         for( ;; )
 281         {
 282                 if( Adapter->Type == NULL )
 283                 {
 284                         int len = VFS_Read((tVAddr)Adapter->CardHandle, MTU, data);
 285                         IPStack_Buffer_AppendSubBuffer(buf, len, 0, buf, NULL, NULL);
 286                 }
 287                 else
 288                 {
 289                         buf = Adapter->Type->WaitForPacket( Adapter->CardHandle );
 290                 }
 291
 292                 Link_HandlePacket(Adapter, buf);
 293
 294                 if( Adapter->Type == NULL )
 295                 {
 296                         IPStack_Buffer_ClearBuffer(buf);
 297                 }
 298                 else
 299                 {
 300                         IPStack_Buffer_DestroyBuffer(buf);
 301                 }
 302         }
 303 }
 304
 305 tIPStackBuffer *Adapter_int_LoopbackWaitPacket(void *Unused)
 306 {
 307         Threads_Sleep();
 308         return NULL;
 309 }
 310
 311 int Adapter_int_LoopbackSendPacket(void *Unused, tIPStackBuffer *Buffer)
 312 {
 313         // This is a little hacky :)
 314         Link_HandlePacket(&gIP_LoopAdapter, Buffer);
 315         return 0;
 316 }
 317
 318 // --- Broadcast Debugging ---
 319 extern Uint16   IPv4_Checksum(const void *Buf, size_t Length);
 320 void IPStack_SendDebugText(const char *Text)
 321 {
 322         const Uint8     pkt_hdr[] = {
 323                 0xFF,0xFF, 0xFF,0xFF, 0xFF,0xFF,
 324                 0x00,0x00, 0x00,0x00, 0x00,0x00,
 325                 0x08,0x00,
 326
 327                 0x45,0x00,      // Version/Length, DiffServices
 328                 0xFF,0xFF,      // Total Length
 329                 0x00,0x00,      // Identifcation
 330                 0x00,0x00, 0xFF,0x11,   // Flags,Fragment, TTL=255,proto=UDP
 331                 0x00,0x00,      // Header checksum
 332                 0x00,0x00,0x00,0x00,    // Source
 333                 0xFF,0xFF,0xFF,0xFF,    // Destination
 334
 335                 0x80,0x00, 0x80,0x00,
 336                 0xFF,0xFF, 0xFF,0xFF,
 337         };
 338         static tShortSpinlock   lLock;
 339
 340         // Fast return if there's no avaliable adapters
 341         if( !gpIP_AdapterList )
 342                 return ;
 343
 344         if( CPU_HAS_LOCK(&lLock) )
 345                 return ;        // Nested!
 346         SHORTLOCK(&lLock);
 347         __asm__ __volatile__ ("sti");   // Start interrupts (x86 specific)
 348
 349         // Cache packets until a newline
 350         static char     cache[1500 - (sizeof(pkt_hdr) + 4)];
 351         static int      cache_len;
 352
 353          int    len = strlen(Text);
 354
 355         // Append to cache
 356         strncpy(cache + cache_len, Text, sizeof(cache) - cache_len);
 357         cache_len += len;
 358         // TODO: Detect overflows.
 359
 360         // If there's no newline, only buffer
 361         if( strpos(Text, '\n') == -1 ) {
 362                 SHORTREL(&lLock);
 363                 return ;
 364         }
 365
 366         // Build packet
 367          int    link_checksum_ofs = sizeof(pkt_hdr) + cache_len;
 368         char    buffer[sizeof(pkt_hdr) + cache_len + 4];
 369
 370         memcpy(buffer, pkt_hdr, sizeof(pkt_hdr));
 371         memcpy(buffer + sizeof(pkt_hdr), cache, cache_len);
 372
 373         ((Uint16*)buffer)[(14+2)/2] = BigEndian16( sizeof(pkt_hdr)-14 + cache_len );    // IP Size
 374         ((Uint16*)buffer)[(14+10)/2] = BigEndian16( 0 );        // IP Header
 375         ((Uint16*)buffer)[(14+20+4)/2] = BigEndian16( 8+cache_len );    // UDP Size
 376         ((Uint16*)buffer)[(14+20+6)/2] = BigEndian16( 0 );      // UDP Checksum
 377 //      *(Uint32*)&buffer[link_checksum_ofs] = BigEndian32( 0 );        // 802.3 checksum?
 378         // TODO: Calculate checksums
 379         ((Uint16*)buffer)[(14+10)/2] = BigEndian16( IPv4_Checksum(buffer+14,20) );      // IP Header
 380
 381         // Create buffer
 382         tIPStackBuffer  *buf = IPStack_Buffer_CreateBuffer(1);
 383         IPStack_Buffer_AppendSubBuffer(buf, link_checksum_ofs+4, 0, buffer, NULL, NULL);
 384
 385         // Send 'er off
 386         for( tAdapter *a = gpIP_AdapterList; a; a = a->Next )
 387         {
 388                 a->Type->SendPacket( a->CardHandle, buf );
 389         }
 390
 391         IPStack_Buffer_DestroyBuffer(buf);
 392
 393         cache_len = 0;
 394
 395         SHORTREL(&lLock);
 396 }
 397