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1 | /** @file\r |
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2 | IP4 input process.\r |
| 3 | \r |
| 4 | Copyright (c) 2005 - 2007, Intel Corporation.<BR>\r |
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5 | All rights reserved. This program and the accompanying materials\r |
| 6 | are licensed and made available under the terms and conditions of the BSD License\r |
| 7 | which accompanies this distribution. The full text of the license may be found at\r |
| 8 | http://opensource.org/licenses/bsd-license.php\r |
| 9 | \r |
| 10 | THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,\r |
| 11 | WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.\r |
| 12 | \r |
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13 | **/\r |
| 14 | \r |
| 15 | #include "Ip4Impl.h"\r |
| 16 | \r |
| 17 | \r |
| 18 | /**\r |
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19 | Create an empty assemble entry for the packet identified by\r |
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20 | (Dst, Src, Id, Protocol). The default life for the packet is\r |
| 21 | 120 seconds.\r |
| 22 | \r |
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23 | @param[in] Dst The destination address\r |
| 24 | @param[in] Src The source address\r |
| 25 | @param[in] Id The ID field in IP header\r |
| 26 | @param[in] Protocol The protocol field in IP header\r |
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27 | \r |
| 28 | @return NULL if failed to allocate memory for the entry, otherwise\r |
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29 | the point to just created reassemble entry.\r |
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30 | \r |
| 31 | **/\r |
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32 | IP4_ASSEMBLE_ENTRY *\r |
| 33 | Ip4CreateAssembleEntry (\r |
| 34 | IN IP4_ADDR Dst,\r |
| 35 | IN IP4_ADDR Src,\r |
| 36 | IN UINT16 Id,\r |
| 37 | IN UINT8 Protocol\r |
| 38 | )\r |
| 39 | {\r |
| 40 | \r |
| 41 | IP4_ASSEMBLE_ENTRY *Assemble;\r |
| 42 | \r |
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43 | Assemble = AllocatePool (sizeof (IP4_ASSEMBLE_ENTRY));\r |
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44 | \r |
| 45 | if (Assemble == NULL) {\r |
| 46 | return NULL;\r |
| 47 | }\r |
| 48 | \r |
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49 | InitializeListHead (&Assemble->Link);\r |
| 50 | InitializeListHead (&Assemble->Fragments);\r |
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51 | \r |
| 52 | Assemble->Dst = Dst;\r |
| 53 | Assemble->Src = Src;\r |
| 54 | Assemble->Id = Id;\r |
| 55 | Assemble->Protocol = Protocol;\r |
| 56 | Assemble->TotalLen = 0;\r |
| 57 | Assemble->CurLen = 0;\r |
| 58 | Assemble->Head = NULL;\r |
| 59 | Assemble->Info = NULL;\r |
| 60 | Assemble->Life = IP4_FRAGMENT_LIFE;\r |
| 61 | \r |
| 62 | return Assemble;\r |
| 63 | }\r |
| 64 | \r |
| 65 | \r |
| 66 | /**\r |
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67 | Release all the fragments of a packet, then free the assemble entry.\r |
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68 | \r |
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69 | @param[in] Assemble The assemble entry to free\r |
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70 | \r |
| 71 | **/\r |
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72 | VOID\r |
| 73 | Ip4FreeAssembleEntry (\r |
| 74 | IN IP4_ASSEMBLE_ENTRY *Assemble\r |
| 75 | )\r |
| 76 | {\r |
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77 | LIST_ENTRY *Entry;\r |
| 78 | LIST_ENTRY *Next;\r |
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79 | NET_BUF *Fragment;\r |
| 80 | \r |
| 81 | NET_LIST_FOR_EACH_SAFE (Entry, Next, &Assemble->Fragments) {\r |
| 82 | Fragment = NET_LIST_USER_STRUCT (Entry, NET_BUF, List);\r |
| 83 | \r |
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84 | RemoveEntryList (Entry);\r |
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85 | NetbufFree (Fragment);\r |
| 86 | }\r |
| 87 | \r |
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88 | gBS->FreePool (Assemble);\r |
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89 | }\r |
| 90 | \r |
| 91 | \r |
| 92 | /**\r |
| 93 | Initialize an already allocated assemble table. This is generally\r |
| 94 | the assemble table embedded in the IP4 service instance.\r |
| 95 | \r |
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96 | @param[in, out] Table The assemble table to initialize.\r |
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97 | \r |
| 98 | **/\r |
| 99 | VOID\r |
| 100 | Ip4InitAssembleTable (\r |
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101 | IN OUT IP4_ASSEMBLE_TABLE *Table\r |
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102 | )\r |
| 103 | {\r |
| 104 | UINT32 Index;\r |
| 105 | \r |
| 106 | for (Index = 0; Index < IP4_ASSEMLE_HASH_SIZE; Index++) {\r |
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107 | InitializeListHead (&Table->Bucket[Index]);\r |
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108 | }\r |
| 109 | }\r |
| 110 | \r |
| 111 | \r |
| 112 | /**\r |
| 113 | Clean up the assemble table: remove all the fragments\r |
| 114 | and assemble entries.\r |
| 115 | \r |
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116 | @param[in] Table The assemble table to clean up\r |
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117 | \r |
| 118 | **/\r |
| 119 | VOID\r |
| 120 | Ip4CleanAssembleTable (\r |
| 121 | IN IP4_ASSEMBLE_TABLE *Table\r |
| 122 | )\r |
| 123 | {\r |
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124 | LIST_ENTRY *Entry;\r |
| 125 | LIST_ENTRY *Next;\r |
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126 | IP4_ASSEMBLE_ENTRY *Assemble;\r |
| 127 | UINT32 Index;\r |
| 128 | \r |
| 129 | for (Index = 0; Index < IP4_ASSEMLE_HASH_SIZE; Index++) {\r |
| 130 | NET_LIST_FOR_EACH_SAFE (Entry, Next, &Table->Bucket[Index]) {\r |
| 131 | Assemble = NET_LIST_USER_STRUCT (Entry, IP4_ASSEMBLE_ENTRY, Link);\r |
| 132 | \r |
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133 | RemoveEntryList (Entry);\r |
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134 | Ip4FreeAssembleEntry (Assemble);\r |
| 135 | }\r |
| 136 | }\r |
| 137 | }\r |
| 138 | \r |
| 139 | \r |
| 140 | /**\r |
| 141 | Trim the packet to fit in [Start, End), and update the per\r |
| 142 | packet information.\r |
| 143 | \r |
| 144 | @param Packet Packet to trim\r |
| 145 | @param Start The sequence of the first byte to fit in\r |
| 146 | @param End One beyond the sequence of last byte to fit in.\r |
| 147 | \r |
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148 | **/\r |
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149 | VOID\r |
| 150 | Ip4TrimPacket (\r |
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151 | IN OUT NET_BUF *Packet,\r |
| 152 | IN INTN Start,\r |
| 153 | IN INTN End\r |
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154 | )\r |
| 155 | {\r |
| 156 | IP4_CLIP_INFO *Info;\r |
| 157 | INTN Len;\r |
| 158 | \r |
| 159 | Info = IP4_GET_CLIP_INFO (Packet);\r |
| 160 | \r |
| 161 | ASSERT (Info->Start + Info->Length == Info->End);\r |
| 162 | ASSERT ((Info->Start < End) && (Start < Info->End));\r |
| 163 | \r |
| 164 | if (Info->Start < Start) {\r |
| 165 | Len = Start - Info->Start;\r |
| 166 | \r |
| 167 | NetbufTrim (Packet, (UINT32) Len, NET_BUF_HEAD);\r |
| 168 | Info->Start = Start;\r |
| 169 | Info->Length -= Len;\r |
| 170 | }\r |
| 171 | \r |
| 172 | if (End < Info->End) {\r |
| 173 | Len = End - Info->End;\r |
| 174 | \r |
| 175 | NetbufTrim (Packet, (UINT32) Len, NET_BUF_TAIL);\r |
| 176 | Info->End = End;\r |
| 177 | Info->Length -= Len;\r |
| 178 | }\r |
| 179 | }\r |
| 180 | \r |
| 181 | \r |
| 182 | /**\r |
| 183 | Release all the fragments of the packet. This is the callback for\r |
| 184 | the assembled packet's OnFree. It will free the assemble entry,\r |
| 185 | which in turn will free all the fragments of the packet.\r |
| 186 | \r |
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187 | @param[in] Arg The assemble entry to free\r |
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188 | \r |
| 189 | **/\r |
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190 | VOID\r |
| 191 | Ip4OnFreeFragments (\r |
| 192 | IN VOID *Arg\r |
| 193 | )\r |
| 194 | {\r |
| 195 | Ip4FreeAssembleEntry ((IP4_ASSEMBLE_ENTRY *) Arg);\r |
| 196 | }\r |
| 197 | \r |
| 198 | \r |
| 199 | /**\r |
| 200 | Reassemble the IP fragments. If all the fragments of the packet\r |
| 201 | have been received, it will wrap the packet in a net buffer then\r |
| 202 | return it to caller. If the packet can't be assembled, NULL is\r |
| 203 | return.\r |
| 204 | \r |
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205 | @param Table The assemble table used. New assemble entry will be created\r |
| 206 | if the Packet is from a new chain of fragments.\r |
| 207 | @param Packet The fragment to assemble. It might be freed if the fragment\r |
| 208 | can't be re-assembled.\r |
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209 | \r |
| 210 | @return NULL if the packet can't be reassemble. The point to just assembled\r |
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211 | packet if all the fragments of the packet have arrived.\r |
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212 | \r |
| 213 | **/\r |
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214 | NET_BUF *\r |
| 215 | Ip4Reassemble (\r |
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216 | IN OUT IP4_ASSEMBLE_TABLE *Table,\r |
| 217 | IN OUT NET_BUF *Packet\r |
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218 | )\r |
| 219 | {\r |
| 220 | IP4_HEAD *IpHead;\r |
| 221 | IP4_CLIP_INFO *This;\r |
| 222 | IP4_CLIP_INFO *Node;\r |
| 223 | IP4_ASSEMBLE_ENTRY *Assemble;\r |
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224 | LIST_ENTRY *Head;\r |
| 225 | LIST_ENTRY *Prev;\r |
| 226 | LIST_ENTRY *Cur;\r |
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227 | NET_BUF *Fragment;\r |
| 228 | NET_BUF *NewPacket;\r |
| 229 | INTN Index;\r |
| 230 | \r |
| 231 | IpHead = Packet->Ip;\r |
| 232 | This = IP4_GET_CLIP_INFO (Packet);\r |
| 233 | \r |
| 234 | ASSERT (IpHead != NULL);\r |
| 235 | \r |
| 236 | //\r |
| 237 | // First: find the related assemble entry\r |
| 238 | //\r |
| 239 | Assemble = NULL;\r |
| 240 | Index = IP4_ASSEMBLE_HASH (IpHead->Dst, IpHead->Src, IpHead->Id, IpHead->Protocol);\r |
| 241 | \r |
| 242 | NET_LIST_FOR_EACH (Cur, &Table->Bucket[Index]) {\r |
| 243 | Assemble = NET_LIST_USER_STRUCT (Cur, IP4_ASSEMBLE_ENTRY, Link);\r |
| 244 | \r |
| 245 | if ((Assemble->Dst == IpHead->Dst) && (Assemble->Src == IpHead->Src) &&\r |
| 246 | (Assemble->Id == IpHead->Id) && (Assemble->Protocol == IpHead->Protocol)) {\r |
| 247 | break;\r |
| 248 | }\r |
| 249 | }\r |
| 250 | \r |
| 251 | //\r |
| 252 | // Create a new assemble entry if no assemble entry is related to this packet\r |
| 253 | //\r |
| 254 | if (Cur == &Table->Bucket[Index]) {\r |
| 255 | Assemble = Ip4CreateAssembleEntry (\r |
| 256 | IpHead->Dst,\r |
| 257 | IpHead->Src,\r |
| 258 | IpHead->Id,\r |
| 259 | IpHead->Protocol\r |
| 260 | );\r |
| 261 | \r |
| 262 | if (Assemble == NULL) {\r |
| 263 | goto DROP;\r |
| 264 | }\r |
| 265 | \r |
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266 | InsertHeadList (&Table->Bucket[Index], &Assemble->Link);\r |
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267 | }\r |
| 268 | \r |
| 269 | //\r |
| 270 | // Find the point to insert the packet: before the first\r |
| 271 | // fragment with THIS.Start < CUR.Start. the previous one\r |
| 272 | // has PREV.Start <= THIS.Start < CUR.Start.\r |
| 273 | //\r |
| 274 | Head = &Assemble->Fragments;\r |
| 275 | \r |
| 276 | NET_LIST_FOR_EACH (Cur, Head) {\r |
| 277 | Fragment = NET_LIST_USER_STRUCT (Cur, NET_BUF, List);\r |
| 278 | \r |
| 279 | if (This->Start < IP4_GET_CLIP_INFO (Fragment)->Start) {\r |
| 280 | break;\r |
| 281 | }\r |
| 282 | }\r |
| 283 | \r |
| 284 | //\r |
| 285 | // Check whether the current fragment overlaps with the previous one.\r |
| 286 | // It holds that: PREV.Start <= THIS.Start < THIS.End. Only need to\r |
| 287 | // check whether THIS.Start < PREV.End for overlap. If two fragments\r |
| 288 | // overlaps, trim the overlapped part off THIS fragment.\r |
| 289 | //\r |
| 290 | if ((Prev = Cur->ForwardLink) != Head) {\r |
| 291 | Fragment = NET_LIST_USER_STRUCT (Prev, NET_BUF, List);\r |
| 292 | Node = IP4_GET_CLIP_INFO (Fragment);\r |
| 293 | \r |
| 294 | if (This->Start < Node->End) {\r |
| 295 | if (This->End <= Node->End) {\r |
| 296 | NetbufFree (Packet);\r |
| 297 | return NULL;\r |
| 298 | }\r |
| 299 | \r |
| 300 | Ip4TrimPacket (Packet, Node->End, This->End);\r |
| 301 | }\r |
| 302 | }\r |
| 303 | \r |
| 304 | //\r |
| 305 | // Insert the fragment into the packet. The fragment may be removed\r |
| 306 | // from the list by the following checks.\r |
| 307 | //\r |
| 308 | NetListInsertBefore (Cur, &Packet->List);\r |
| 309 | \r |
| 310 | //\r |
| 311 | // Check the packets after the insert point. It holds that:\r |
| 312 | // THIS.Start <= NODE.Start < NODE.End. The equality holds\r |
| 313 | // if PREV and NEXT are continuous. THIS fragment may fill\r |
| 314 | // several holes. Remove the completely overlapped fragments\r |
| 315 | //\r |
| 316 | while (Cur != Head) {\r |
| 317 | Fragment = NET_LIST_USER_STRUCT (Cur, NET_BUF, List);\r |
| 318 | Node = IP4_GET_CLIP_INFO (Fragment);\r |
| 319 | \r |
| 320 | //\r |
| 321 | // Remove fragments completely overlapped by this fragment\r |
| 322 | //\r |
| 323 | if (Node->End <= This->End) {\r |
| 324 | Cur = Cur->ForwardLink;\r |
| 325 | \r |
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326 | RemoveEntryList (&Fragment->List);\r |
| 772db4bb |
327 | Assemble->CurLen -= Node->Length;\r |
| 328 | \r |
| 329 | NetbufFree (Fragment);\r |
| 330 | continue;\r |
| 331 | }\r |
| 332 | \r |
| 333 | //\r |
| 334 | // The conditions are: THIS.Start <= NODE.Start, and THIS.End <\r |
| 335 | // NODE.End. Two fragments overlaps if NODE.Start < THIS.End.\r |
| 336 | // If two fragments start at the same offset, remove THIS fragment\r |
| 337 | // because ((THIS.Start == NODE.Start) && (THIS.End < NODE.End)).\r |
| 338 | //\r |
| 339 | if (Node->Start < This->End) {\r |
| 340 | if (This->Start == Node->Start) {\r |
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341 | RemoveEntryList (&Packet->List);\r |
| 772db4bb |
342 | goto DROP;\r |
| 343 | }\r |
| 344 | \r |
| 345 | Ip4TrimPacket (Packet, This->Start, Node->Start);\r |
| 346 | }\r |
| 347 | \r |
| 348 | break;\r |
| 349 | }\r |
| 350 | \r |
| 351 | //\r |
| 352 | // Update the assemble info: increase the current length. If it is\r |
| 353 | // the frist fragment, update the packet's IP head and per packet\r |
| 354 | // info. If it is the last fragment, update the total length.\r |
| 355 | //\r |
| 356 | Assemble->CurLen += This->Length;\r |
| 357 | \r |
| 358 | if (This->Start == 0) {\r |
| 359 | //\r |
| 360 | // Once the first fragment is enqueued, it can't be removed\r |
| 361 | // from the fragment list. So, Assemble->Head always point\r |
| 362 | // to valid memory area.\r |
| 363 | //\r |
| 364 | ASSERT (Assemble->Head == NULL);\r |
| 365 | \r |
| 366 | Assemble->Head = IpHead;\r |
| 367 | Assemble->Info = IP4_GET_CLIP_INFO (Packet);\r |
| 368 | }\r |
| 369 | \r |
| 370 | //\r |
| 371 | // Don't update the length more than once.\r |
| 372 | //\r |
| 373 | if (IP4_LAST_FRAGMENT (IpHead->Fragment) && (Assemble->TotalLen == 0)) {\r |
| 374 | Assemble->TotalLen = This->End;\r |
| 375 | }\r |
| 376 | \r |
| 377 | //\r |
| 378 | // Deliver the whole packet if all the fragments received.\r |
| 379 | // All fragments received if:\r |
| 96e1079f |
380 | // 1. received the last one, so, the total length is know\r |
| 772db4bb |
381 | // 2. received all the data. If the last fragment on the\r |
| 382 | // queue ends at the total length, all data is received.\r |
| 383 | //\r |
| 384 | if ((Assemble->TotalLen != 0) && (Assemble->CurLen >= Assemble->TotalLen)) {\r |
| 385 | \r |
| e48e37fc |
386 | RemoveEntryList (&Assemble->Link);\r |
| 772db4bb |
387 | \r |
| 388 | //\r |
| 389 | // If the packet is properly formated, the last fragment's End\r |
| 390 | // equals to the packet's total length. Otherwise, the packet\r |
| 391 | // is a fake, drop it now.\r |
| 392 | //\r |
| 393 | Fragment = NET_LIST_USER_STRUCT (Head->BackLink, NET_BUF, List);\r |
| 394 | \r |
| 395 | if (IP4_GET_CLIP_INFO (Fragment)->End != Assemble->TotalLen) {\r |
| 396 | Ip4FreeAssembleEntry (Assemble);\r |
| 397 | return NULL;\r |
| 398 | }\r |
| 399 | \r |
| 400 | //\r |
| 401 | // Wrap the packet in a net buffer then deliver it up\r |
| 402 | //\r |
| 403 | NewPacket = NetbufFromBufList (\r |
| 404 | &Assemble->Fragments,\r |
| 405 | 0,\r |
| 406 | 0,\r |
| 407 | Ip4OnFreeFragments,\r |
| 408 | Assemble\r |
| 409 | );\r |
| 410 | \r |
| 411 | if (NewPacket == NULL) {\r |
| 412 | Ip4FreeAssembleEntry (Assemble);\r |
| 413 | return NULL;\r |
| 414 | }\r |
| 415 | \r |
| 96e1079f |
416 | NewPacket->Ip = Assemble->Head;\r |
| 687a2e5f |
417 | CopyMem (IP4_GET_CLIP_INFO (NewPacket), Assemble->Info, sizeof (*IP4_GET_CLIP_INFO (NewPacket)));\r |
| 772db4bb |
418 | return NewPacket;\r |
| 419 | }\r |
| 420 | \r |
| 421 | return NULL;\r |
| 422 | \r |
| 423 | DROP:\r |
| 424 | NetbufFree (Packet);\r |
| 425 | return NULL;\r |
| 426 | }\r |
| 427 | \r |
| 428 | \r |
| 429 | /**\r |
| 430 | The IP4 input routine. It is called by the IP4_INTERFACE when a\r |
| 431 | IP4 fragment is received from MNP.\r |
| 432 | \r |
| 3e8c18da |
433 | @param[in] Ip4Instance The IP4 child that request the receive, most like\r |
| 772db4bb |
434 | it is NULL.\r |
| 3e8c18da |
435 | @param[in] Packet The IP4 packet received.\r |
| 436 | @param[in] IoStatus The return status of receive request.\r |
| 437 | @param[in] Flag The link layer flag for the packet received, such\r |
| 772db4bb |
438 | as multicast.\r |
| 3e8c18da |
439 | @param[in] Context The IP4 service instance that own the MNP.\r |
| 772db4bb |
440 | \r |
| 441 | **/\r |
| 442 | VOID\r |
| 443 | Ip4AccpetFrame (\r |
| 444 | IN IP4_PROTOCOL *Ip4Instance,\r |
| 445 | IN NET_BUF *Packet,\r |
| 446 | IN EFI_STATUS IoStatus,\r |
| 447 | IN UINT32 Flag,\r |
| 448 | IN VOID *Context\r |
| 449 | )\r |
| 450 | {\r |
| 451 | IP4_SERVICE *IpSb;\r |
| 452 | IP4_CLIP_INFO *Info;\r |
| 453 | IP4_HEAD *Head;\r |
| 454 | UINT32 HeadLen;\r |
| 455 | UINT32 OptionLen;\r |
| 456 | UINT32 TotalLen;\r |
| 457 | UINT16 Checksum;\r |
| 458 | \r |
| 459 | IpSb = (IP4_SERVICE *) Context;\r |
| 460 | \r |
| 461 | if (EFI_ERROR (IoStatus) || (IpSb->State == IP4_SERVICE_DESTORY)) {\r |
| 462 | goto DROP;\r |
| 463 | }\r |
| 464 | \r |
| 465 | //\r |
| 96e1079f |
466 | // Check that the IP4 header is correctly formatted\r |
| 772db4bb |
467 | //\r |
| 468 | if (Packet->TotalSize < IP4_MIN_HEADLEN) {\r |
| 469 | goto RESTART;\r |
| 470 | }\r |
| 471 | \r |
| 472 | Head = (IP4_HEAD *) NetbufGetByte (Packet, 0, NULL);\r |
| 473 | HeadLen = (Head->HeadLen << 2);\r |
| 474 | TotalLen = NTOHS (Head->TotalLen);\r |
| 475 | \r |
| 476 | //\r |
| 477 | // Mnp may deliver frame trailer sequence up, trim it off.\r |
| 478 | //\r |
| 479 | if (TotalLen < Packet->TotalSize) {\r |
| 480 | NetbufTrim (Packet, Packet->TotalSize - TotalLen, FALSE);\r |
| 481 | }\r |
| 482 | \r |
| 483 | if ((Head->Ver != 4) || (HeadLen < IP4_MIN_HEADLEN) ||\r |
| 484 | (TotalLen < HeadLen) || (TotalLen != Packet->TotalSize)) {\r |
| 485 | goto RESTART;\r |
| 486 | }\r |
| 487 | \r |
| 488 | //\r |
| 489 | // Some OS may send IP packets without checksum.\r |
| 490 | //\r |
| 687a2e5f |
491 | Checksum = (UINT16) (~NetblockChecksum ((UINT8 *) Head, HeadLen));\r |
| 772db4bb |
492 | \r |
| 493 | if ((Head->Checksum != 0) && (Checksum != 0)) {\r |
| 494 | goto RESTART;\r |
| 495 | }\r |
| 496 | \r |
| 497 | //\r |
| 498 | // Convert the IP header to host byte order, then get the per packet info.\r |
| 499 | //\r |
| 500 | Packet->Ip = Ip4NtohHead (Head);\r |
| 501 | \r |
| 502 | Info = IP4_GET_CLIP_INFO (Packet);\r |
| 503 | Info->LinkFlag = Flag;\r |
| 504 | Info->CastType = Ip4GetHostCast (IpSb, Head->Dst, Head->Src);\r |
| 505 | Info->Start = (Head->Fragment & IP4_HEAD_OFFSET_MASK) << 3;\r |
| 506 | Info->Length = Head->TotalLen - HeadLen;\r |
| 507 | Info->End = Info->Start + Info->Length;\r |
| 508 | Info->Status = EFI_SUCCESS;\r |
| 509 | \r |
| 510 | //\r |
| 511 | // The packet is destinated to us if the CastType is non-zero.\r |
| 512 | //\r |
| 513 | if ((Info->CastType == 0) || (Info->End > IP4_MAX_PACKET_SIZE)) {\r |
| 514 | goto RESTART;\r |
| 515 | }\r |
| 516 | \r |
| 517 | //\r |
| 518 | // Validate the options. Don't call the Ip4OptionIsValid if\r |
| 519 | // there is no option to save some CPU process.\r |
| 520 | //\r |
| 521 | OptionLen = HeadLen - IP4_MIN_HEADLEN;\r |
| 522 | \r |
| 523 | if ((OptionLen > 0) && !Ip4OptionIsValid ((UINT8 *) (Head + 1), OptionLen, TRUE)) {\r |
| 524 | goto RESTART;\r |
| 525 | }\r |
| 526 | \r |
| 527 | //\r |
| 528 | // Trim the head off, after this point, the packet is headless.\r |
| 529 | // and Packet->TotalLen == Info->Length.\r |
| 530 | //\r |
| 531 | NetbufTrim (Packet, HeadLen, TRUE);\r |
| 532 | \r |
| 533 | //\r |
| 534 | // Reassemble the packet if this is a fragment. The packet is a\r |
| 535 | // fragment if its head has MF (more fragment) set, or it starts\r |
| 536 | // at non-zero byte.\r |
| 537 | //\r |
| b2c0a175 |
538 | if (((Head->Fragment & IP4_HEAD_MF_MASK) != 0) || (Info->Start != 0)) {\r |
| 772db4bb |
539 | //\r |
| 540 | // Drop the fragment if DF is set but it is fragmented. Gateway\r |
| 541 | // need to send a type 4 destination unreache ICMP message here.\r |
| 542 | //\r |
| b2c0a175 |
543 | if ((Head->Fragment & IP4_HEAD_DF_MASK) != 0) {\r |
| 772db4bb |
544 | goto RESTART;\r |
| 545 | }\r |
| 546 | \r |
| 547 | //\r |
| 548 | // The length of all but the last fragments is in the unit of 8 bytes.\r |
| 549 | //\r |
| b2c0a175 |
550 | if (((Head->Fragment & IP4_HEAD_MF_MASK) != 0) && (Info->Length % 8 != 0)) {\r |
| 772db4bb |
551 | goto RESTART;\r |
| 552 | }\r |
| 553 | \r |
| 554 | Packet = Ip4Reassemble (&IpSb->Assemble, Packet);\r |
| 555 | \r |
| 556 | //\r |
| 557 | // Packet assembly isn't complete, start receive more packet.\r |
| 558 | //\r |
| 559 | if (Packet == NULL) {\r |
| 560 | goto RESTART;\r |
| 561 | }\r |
| 562 | }\r |
| 563 | \r |
| 564 | //\r |
| 565 | // Packet may have been changed. Head, HeadLen, TotalLen, and\r |
| 566 | // info must be reloaded bofore use. The ownership of the packet\r |
| 567 | // is transfered to the packet process logic.\r |
| 568 | //\r |
| 569 | Head = Packet->Ip;\r |
| 570 | IP4_GET_CLIP_INFO (Packet)->Status = EFI_SUCCESS;\r |
| 571 | \r |
| 572 | switch (Head->Protocol) {\r |
| 573 | case IP4_PROTO_ICMP:\r |
| 574 | Ip4IcmpHandle (IpSb, Head, Packet);\r |
| 575 | break;\r |
| 576 | \r |
| 577 | case IP4_PROTO_IGMP:\r |
| 578 | Ip4IgmpHandle (IpSb, Head, Packet);\r |
| 579 | break;\r |
| 580 | \r |
| 581 | default:\r |
| 582 | Ip4Demultiplex (IpSb, Head, Packet);\r |
| 583 | }\r |
| 584 | \r |
| 585 | Packet = NULL;\r |
| 586 | \r |
| 36ee91ca |
587 | //\r |
| 588 | // Dispatch the DPCs queued by the NotifyFunction of the rx token's events\r |
| 589 | // which are signaled with received data.\r |
| 590 | //\r |
| 591 | NetLibDispatchDpc ();\r |
| 592 | \r |
| 772db4bb |
593 | RESTART:\r |
| 594 | Ip4ReceiveFrame (IpSb->DefaultInterface, NULL, Ip4AccpetFrame, IpSb);\r |
| 595 | \r |
| 596 | DROP:\r |
| 597 | if (Packet != NULL) {\r |
| 598 | NetbufFree (Packet);\r |
| 599 | }\r |
| 600 | \r |
| 601 | return ;\r |
| 602 | }\r |
| 603 | \r |
| 604 | \r |
| 605 | /**\r |
| 606 | Check whether this IP child accepts the packet.\r |
| 607 | \r |
| 3e8c18da |
608 | @param[in] IpInstance The IP child to check\r |
| 609 | @param[in] Head The IP header of the packet\r |
| 610 | @param[in] Packet The data of the packet\r |
| 772db4bb |
611 | \r |
| 96e1079f |
612 | @retval TRUE If the child wants to receive the packet.\r |
| 613 | @retval FALSE Otherwise.\r |
| 772db4bb |
614 | \r |
| 615 | **/\r |
| 616 | BOOLEAN\r |
| 617 | Ip4InstanceFrameAcceptable (\r |
| 618 | IN IP4_PROTOCOL *IpInstance,\r |
| 619 | IN IP4_HEAD *Head,\r |
| 620 | IN NET_BUF *Packet\r |
| 621 | )\r |
| 622 | {\r |
| 623 | IP4_ICMP_ERROR_HEAD Icmp;\r |
| 624 | EFI_IP4_CONFIG_DATA *Config;\r |
| 625 | IP4_CLIP_INFO *Info;\r |
| 626 | UINT16 Proto;\r |
| 627 | UINT32 Index;\r |
| 628 | \r |
| 629 | Config = &IpInstance->ConfigData;\r |
| 630 | \r |
| 631 | //\r |
| 632 | // Dirty trick for the Tiano UEFI network stack implmentation. If\r |
| 633 | // ReceiveTimeout == -1, the receive of the packet for this instance\r |
| 96e1079f |
634 | // is disabled. The UEFI spec don't have such capability. We add\r |
| 772db4bb |
635 | // this to improve the performance because IP will make a copy of\r |
| 636 | // the received packet for each accepting instance. Some IP instances\r |
| 637 | // used by UDP/TCP only send packets, they don't wants to receive.\r |
| 638 | //\r |
| 639 | if (Config->ReceiveTimeout == (UINT32)(-1)) {\r |
| 640 | return FALSE;\r |
| 641 | }\r |
| 642 | \r |
| 643 | if (Config->AcceptPromiscuous) {\r |
| 644 | return TRUE;\r |
| 645 | }\r |
| 646 | \r |
| 647 | //\r |
| 648 | // Use protocol from the IP header embedded in the ICMP error\r |
| 649 | // message to filter, instead of ICMP itself. ICMP handle will\r |
| 650 | // can Ip4Demultiplex to deliver ICMP errors.\r |
| 651 | //\r |
| 652 | Proto = Head->Protocol;\r |
| 653 | \r |
| 654 | if (Proto == IP4_PROTO_ICMP) {\r |
| 655 | NetbufCopy (Packet, 0, sizeof (Icmp.Head), (UINT8 *) &Icmp.Head);\r |
| 656 | \r |
| 657 | if (mIcmpClass[Icmp.Head.Type].IcmpClass == ICMP_ERROR_MESSAGE) {\r |
| 658 | if (!Config->AcceptIcmpErrors) {\r |
| 659 | return FALSE;\r |
| 660 | }\r |
| 661 | \r |
| 662 | NetbufCopy (Packet, 0, sizeof (Icmp), (UINT8 *) &Icmp);\r |
| 663 | Proto = Icmp.IpHead.Protocol;\r |
| 664 | }\r |
| 665 | }\r |
| 666 | \r |
| 667 | //\r |
| 668 | // Match the protocol\r |
| 669 | //\r |
| 670 | if (!Config->AcceptAnyProtocol && (Proto != Config->DefaultProtocol)) {\r |
| 671 | return FALSE;\r |
| 672 | }\r |
| 673 | \r |
| 674 | //\r |
| 675 | // Check for broadcast, the caller has computed the packet's\r |
| 676 | // cast type for this child's interface.\r |
| 677 | //\r |
| 678 | Info = IP4_GET_CLIP_INFO (Packet);\r |
| 679 | \r |
| 680 | if (IP4_IS_BROADCAST (Info->CastType)) {\r |
| 681 | return Config->AcceptBroadcast;\r |
| 682 | }\r |
| 683 | \r |
| 684 | //\r |
| 685 | // If it is a multicast packet, check whether we are in the group.\r |
| 686 | //\r |
| 687 | if (Info->CastType == IP4_MULTICAST) {\r |
| 688 | //\r |
| 689 | // Receive the multicast if the instance wants to receive all packets.\r |
| 690 | //\r |
| 691 | if (!IpInstance->ConfigData.UseDefaultAddress && (IpInstance->Interface->Ip == 0)) {\r |
| 692 | return TRUE;\r |
| 693 | }\r |
| 694 | \r |
| 695 | for (Index = 0; Index < IpInstance->GroupCount; Index++) {\r |
| 696 | if (IpInstance->Groups[Index] == HTONL (Head->Dst)) {\r |
| 697 | break;\r |
| 698 | }\r |
| 699 | }\r |
| 700 | \r |
| 701 | return (BOOLEAN)(Index < IpInstance->GroupCount);\r |
| 702 | }\r |
| 703 | \r |
| 704 | return TRUE;\r |
| 705 | }\r |
| 706 | \r |
| 707 | \r |
| 708 | /**\r |
| 709 | Enqueue a shared copy of the packet to the IP4 child if the\r |
| 710 | packet is acceptable to it. Here the data of the packet is\r |
| 711 | shared, but the net buffer isn't.\r |
| 712 | \r |
| 3e8c18da |
713 | @param[in] IpInstance The IP4 child to enqueue the packet to\r |
| 714 | @param[in] Head The IP header of the received packet\r |
| 715 | @param[in] Packet The data of the received packet\r |
| 772db4bb |
716 | \r |
| 717 | @retval EFI_NOT_STARTED The IP child hasn't been configured.\r |
| 718 | @retval EFI_INVALID_PARAMETER The child doesn't want to receive the packet\r |
| 719 | @retval EFI_OUT_OF_RESOURCES Failed to allocate some resource\r |
| 720 | @retval EFI_SUCCESS A shared copy the packet is enqueued to the child.\r |
| 721 | \r |
| 722 | **/\r |
| 723 | EFI_STATUS\r |
| 724 | Ip4InstanceEnquePacket (\r |
| 725 | IN IP4_PROTOCOL *IpInstance,\r |
| 726 | IN IP4_HEAD *Head,\r |
| 727 | IN NET_BUF *Packet\r |
| 728 | )\r |
| 729 | {\r |
| 730 | IP4_CLIP_INFO *Info;\r |
| 731 | NET_BUF *Clone;\r |
| 732 | \r |
| 733 | //\r |
| 734 | // Check whether the packet is acceptable to this instance.\r |
| 735 | //\r |
| 736 | if (IpInstance->State != IP4_STATE_CONFIGED) {\r |
| 737 | return EFI_NOT_STARTED;\r |
| 738 | }\r |
| 739 | \r |
| 740 | if (!Ip4InstanceFrameAcceptable (IpInstance, Head, Packet)) {\r |
| 741 | return EFI_INVALID_PARAMETER;\r |
| 742 | }\r |
| 743 | \r |
| 744 | //\r |
| 745 | // Enque a shared copy of the packet.\r |
| 746 | //\r |
| 747 | Clone = NetbufClone (Packet);\r |
| 748 | \r |
| 749 | if (Clone == NULL) {\r |
| 750 | return EFI_OUT_OF_RESOURCES;\r |
| 751 | }\r |
| 752 | \r |
| 753 | //\r |
| 754 | // Set the receive time out for the assembled packet. If it expires,\r |
| 755 | // packet will be removed from the queue.\r |
| 756 | //\r |
| 757 | Info = IP4_GET_CLIP_INFO (Clone);\r |
| 758 | Info->Life = IP4_US_TO_SEC (IpInstance->ConfigData.ReceiveTimeout);\r |
| 759 | \r |
| e48e37fc |
760 | InsertTailList (&IpInstance->Received, &Clone->List);\r |
| 772db4bb |
761 | return EFI_SUCCESS;\r |
| 762 | }\r |
| 763 | \r |
| 764 | \r |
| 765 | /**\r |
| 766 | The signal handle of IP4's recycle event. It is called back\r |
| 767 | when the upper layer release the packet.\r |
| 768 | \r |
| 3e8c18da |
769 | @param Event The IP4's recycle event.\r |
| 770 | @param Context The context of the handle, which is a\r |
| 771 | IP4_RXDATA_WRAP\r |
| 772db4bb |
772 | \r |
| 773 | **/\r |
| 772db4bb |
774 | VOID\r |
| 775 | EFIAPI\r |
| 776 | Ip4OnRecyclePacket (\r |
| 777 | IN EFI_EVENT Event,\r |
| 778 | IN VOID *Context\r |
| 779 | )\r |
| 780 | {\r |
| 781 | IP4_RXDATA_WRAP *Wrap;\r |
| 782 | \r |
| 783 | Wrap = (IP4_RXDATA_WRAP *) Context;\r |
| 784 | \r |
| e48e37fc |
785 | EfiAcquireLockOrFail (&Wrap->IpInstance->RecycleLock);\r |
| 786 | RemoveEntryList (&Wrap->Link);\r |
| 787 | EfiReleaseLock (&Wrap->IpInstance->RecycleLock);\r |
| 772db4bb |
788 | \r |
| 789 | ASSERT (!NET_BUF_SHARED (Wrap->Packet));\r |
| 790 | NetbufFree (Wrap->Packet);\r |
| 791 | \r |
| 792 | gBS->CloseEvent (Wrap->RxData.RecycleSignal);\r |
| e48e37fc |
793 | gBS->FreePool (Wrap);\r |
| 772db4bb |
794 | }\r |
| 795 | \r |
| 796 | \r |
| 797 | /**\r |
| 798 | Wrap the received packet to a IP4_RXDATA_WRAP, which will be\r |
| 799 | delivered to the upper layer. Each IP4 child that accepts the\r |
| 800 | packet will get a not-shared copy of the packet which is wrapped\r |
| 801 | in the IP4_RXDATA_WRAP. The IP4_RXDATA_WRAP->RxData is passed\r |
| 802 | to the upper layer. Upper layer will signal the recycle event in\r |
| 803 | it when it is done with the packet.\r |
| 804 | \r |
| 3e8c18da |
805 | @param[in] IpInstance The IP4 child to receive the packet\r |
| 806 | @param[in] Packet The packet to deliver up.\r |
| 772db4bb |
807 | \r |
| 3e8c18da |
808 | @retval Wrap if warp the packet succeed.\r |
| 809 | @retval NULL failed to wrap the packet .\r |
| 772db4bb |
810 | \r |
| 811 | **/\r |
| 812 | IP4_RXDATA_WRAP *\r |
| 813 | Ip4WrapRxData (\r |
| 814 | IN IP4_PROTOCOL *IpInstance,\r |
| 815 | IN NET_BUF *Packet\r |
| 816 | )\r |
| 817 | {\r |
| 818 | IP4_RXDATA_WRAP *Wrap;\r |
| 819 | EFI_IP4_RECEIVE_DATA *RxData;\r |
| 820 | EFI_STATUS Status;\r |
| 821 | \r |
| e48e37fc |
822 | Wrap = AllocatePool (IP4_RXDATA_WRAP_SIZE (Packet->BlockOpNum));\r |
| 772db4bb |
823 | \r |
| 824 | if (Wrap == NULL) {\r |
| 825 | return NULL;\r |
| 826 | }\r |
| 827 | \r |
| e48e37fc |
828 | InitializeListHead (&Wrap->Link);\r |
| 772db4bb |
829 | \r |
| 830 | Wrap->IpInstance = IpInstance;\r |
| 831 | Wrap->Packet = Packet;\r |
| 832 | RxData = &Wrap->RxData;\r |
| 833 | \r |
| e48e37fc |
834 | ZeroMem (&RxData->TimeStamp, sizeof (EFI_TIME));\r |
| 772db4bb |
835 | \r |
| 836 | Status = gBS->CreateEvent (\r |
| 837 | EVT_NOTIFY_SIGNAL,\r |
| e48e37fc |
838 | TPL_NOTIFY,\r |
| 772db4bb |
839 | Ip4OnRecyclePacket,\r |
| 840 | Wrap,\r |
| 841 | &RxData->RecycleSignal\r |
| 842 | );\r |
| 843 | \r |
| 844 | if (EFI_ERROR (Status)) {\r |
| e48e37fc |
845 | gBS->FreePool (Wrap);\r |
| 772db4bb |
846 | return NULL;\r |
| 847 | }\r |
| 848 | \r |
| 849 | ASSERT (Packet->Ip != NULL);\r |
| 850 | \r |
| 851 | //\r |
| 852 | // The application expects a network byte order header.\r |
| 853 | //\r |
| 854 | RxData->HeaderLength = (Packet->Ip->HeadLen << 2);\r |
| 855 | RxData->Header = (EFI_IP4_HEADER *) Ip4NtohHead (Packet->Ip);\r |
| 856 | \r |
| 857 | RxData->OptionsLength = RxData->HeaderLength - IP4_MIN_HEADLEN;\r |
| 858 | RxData->Options = NULL;\r |
| 859 | \r |
| 860 | if (RxData->OptionsLength != 0) {\r |
| 861 | RxData->Options = (VOID *) (RxData->Header + 1);\r |
| 862 | }\r |
| 863 | \r |
| 864 | RxData->DataLength = Packet->TotalSize;\r |
| 865 | \r |
| 866 | //\r |
| 867 | // Build the fragment table to be delivered up.\r |
| 868 | //\r |
| 869 | RxData->FragmentCount = Packet->BlockOpNum;\r |
| 870 | NetbufBuildExt (Packet, (NET_FRAGMENT *) RxData->FragmentTable, &RxData->FragmentCount);\r |
| 871 | \r |
| 872 | return Wrap;\r |
| 873 | }\r |
| 874 | \r |
| 875 | \r |
| 876 | /**\r |
| 877 | Deliver the received packets to upper layer if there are both received\r |
| 878 | requests and enqueued packets. If the enqueued packet is shared, it will\r |
| 879 | duplicate it to a non-shared packet, release the shared packet, then\r |
| 880 | deliver the non-shared packet up.\r |
| 881 | \r |
| 3e8c18da |
882 | @param[in] IpInstance The IP child to deliver the packet up.\r |
| 772db4bb |
883 | \r |
| 884 | @retval EFI_OUT_OF_RESOURCES Failed to allocate resources to deliver the\r |
| 885 | packets.\r |
| 886 | @retval EFI_SUCCESS All the enqueued packets that can be delivered\r |
| 887 | are delivered up.\r |
| 888 | \r |
| 889 | **/\r |
| 890 | EFI_STATUS\r |
| 891 | Ip4InstanceDeliverPacket (\r |
| 892 | IN IP4_PROTOCOL *IpInstance\r |
| 893 | )\r |
| 894 | {\r |
| 895 | EFI_IP4_COMPLETION_TOKEN *Token;\r |
| 896 | IP4_RXDATA_WRAP *Wrap;\r |
| 897 | NET_BUF *Packet;\r |
| 898 | NET_BUF *Dup;\r |
| 899 | UINT8 *Head;\r |
| 900 | \r |
| 901 | //\r |
| 902 | // Deliver a packet if there are both a packet and a receive token.\r |
| 903 | //\r |
| e48e37fc |
904 | while (!IsListEmpty (&IpInstance->Received) &&\r |
| 772db4bb |
905 | !NetMapIsEmpty (&IpInstance->RxTokens)) {\r |
| 906 | \r |
| 907 | Packet = NET_LIST_HEAD (&IpInstance->Received, NET_BUF, List);\r |
| 908 | \r |
| 909 | if (!NET_BUF_SHARED (Packet)) {\r |
| 910 | //\r |
| 911 | // If this is the only instance that wants the packet, wrap it up.\r |
| 912 | //\r |
| 913 | Wrap = Ip4WrapRxData (IpInstance, Packet);\r |
| 914 | \r |
| 915 | if (Wrap == NULL) {\r |
| 916 | return EFI_OUT_OF_RESOURCES;\r |
| 917 | }\r |
| 918 | \r |
| e48e37fc |
919 | RemoveEntryList (&Packet->List);\r |
| 772db4bb |
920 | \r |
| 921 | } else {\r |
| 922 | //\r |
| 923 | // Create a duplicated packet if this packet is shared\r |
| 924 | //\r |
| 925 | Dup = NetbufDuplicate (Packet, NULL, IP4_MAX_HEADLEN);\r |
| 926 | \r |
| 927 | if (Dup == NULL) {\r |
| 928 | return EFI_OUT_OF_RESOURCES;\r |
| 929 | }\r |
| 930 | \r |
| 931 | //\r |
| 932 | // Copy the IP head over. The packet to deliver up is\r |
| 933 | // headless. Trim the head off after copy. The IP head\r |
| 934 | // may be not continuous before the data.\r |
| 935 | //\r |
| 936 | Head = NetbufAllocSpace (Dup, IP4_MAX_HEADLEN, NET_BUF_HEAD);\r |
| 937 | Dup->Ip = (IP4_HEAD *) Head;\r |
| 938 | \r |
| e48e37fc |
939 | CopyMem (Head, Packet->Ip, Packet->Ip->HeadLen << 2);\r |
| 772db4bb |
940 | NetbufTrim (Dup, IP4_MAX_HEADLEN, TRUE);\r |
| 941 | \r |
| 942 | Wrap = Ip4WrapRxData (IpInstance, Dup);\r |
| 943 | \r |
| 944 | if (Wrap == NULL) {\r |
| 945 | NetbufFree (Dup);\r |
| 946 | return EFI_OUT_OF_RESOURCES;\r |
| 947 | }\r |
| 948 | \r |
| e48e37fc |
949 | RemoveEntryList (&Packet->List);\r |
| 772db4bb |
950 | NetbufFree (Packet);\r |
| 951 | \r |
| 952 | Packet = Dup;\r |
| 953 | }\r |
| 954 | \r |
| 955 | //\r |
| 956 | // Insert it into the delivered packet, then get a user's\r |
| 957 | // receive token, pass the wrapped packet up.\r |
| 958 | //\r |
| e48e37fc |
959 | EfiAcquireLockOrFail (&IpInstance->RecycleLock);\r |
| 960 | InsertHeadList (&IpInstance->Delivered, &Wrap->Link);\r |
| 961 | EfiReleaseLock (&IpInstance->RecycleLock);\r |
| 772db4bb |
962 | \r |
| 963 | Token = NetMapRemoveHead (&IpInstance->RxTokens, NULL);\r |
| 964 | Token->Status = IP4_GET_CLIP_INFO (Packet)->Status;\r |
| 965 | Token->Packet.RxData = &Wrap->RxData;\r |
| 966 | \r |
| 967 | gBS->SignalEvent (Token->Event);\r |
| 968 | }\r |
| 969 | \r |
| 970 | return EFI_SUCCESS;\r |
| 971 | }\r |
| 972 | \r |
| 973 | \r |
| 974 | /**\r |
| 975 | Enqueue a received packet to all the IP children that share\r |
| 976 | the same interface.\r |
| 977 | \r |
| 3e8c18da |
978 | @param[in] IpSb The IP4 service instance that receive the packet\r |
| 979 | @param[in] Head The header of the received packet\r |
| 980 | @param[in] Packet The data of the received packet\r |
| 981 | @param[in] IpIf The interface to enqueue the packet to\r |
| 772db4bb |
982 | \r |
| 983 | @return The number of the IP4 children that accepts the packet\r |
| 984 | \r |
| 985 | **/\r |
| 986 | INTN\r |
| 987 | Ip4InterfaceEnquePacket (\r |
| 988 | IN IP4_SERVICE *IpSb,\r |
| 989 | IN IP4_HEAD *Head,\r |
| 990 | IN NET_BUF *Packet,\r |
| 991 | IN IP4_INTERFACE *IpIf\r |
| 992 | )\r |
| 993 | {\r |
| 994 | IP4_PROTOCOL *IpInstance;\r |
| 995 | IP4_CLIP_INFO *Info;\r |
| e48e37fc |
996 | LIST_ENTRY *Entry;\r |
| 772db4bb |
997 | INTN Enqueued;\r |
| 998 | INTN LocalType;\r |
| 999 | INTN SavedType;\r |
| 1000 | \r |
| 1001 | //\r |
| 1002 | // First, check that the packet is acceptable to this interface\r |
| 1003 | // and find the local cast type for the interface. A packet sent\r |
| 1004 | // to say 192.168.1.1 should NOT be delliever to 10.0.0.1 unless\r |
| 1005 | // promiscuous receiving.\r |
| 1006 | //\r |
| 1007 | LocalType = 0;\r |
| 1008 | Info = IP4_GET_CLIP_INFO (Packet);\r |
| 1009 | \r |
| 1010 | if ((Info->CastType == IP4_MULTICAST) || (Info->CastType == IP4_LOCAL_BROADCAST)) {\r |
| 1011 | //\r |
| 1012 | // If the CastType is multicast, don't need to filter against\r |
| 1013 | // the group address here, Ip4InstanceFrameAcceptable will do\r |
| 1014 | // that later.\r |
| 1015 | //\r |
| 1016 | LocalType = Info->CastType;\r |
| 1017 | \r |
| 1018 | } else {\r |
| 1019 | //\r |
| 1020 | // Check the destination againist local IP. If the station\r |
| 1021 | // address is 0.0.0.0, it means receiving all the IP destined\r |
| 1022 | // to local non-zero IP. Otherwise, it is necessary to compare\r |
| 1023 | // the destination to the interface's IP address.\r |
| 1024 | //\r |
| 1025 | if (IpIf->Ip == IP4_ALLZERO_ADDRESS) {\r |
| 1026 | LocalType = IP4_LOCAL_HOST;\r |
| 1027 | \r |
| 1028 | } else {\r |
| 1029 | LocalType = Ip4GetNetCast (Head->Dst, IpIf);\r |
| 1030 | \r |
| 1031 | if ((LocalType == 0) && IpIf->PromiscRecv) {\r |
| 1032 | LocalType = IP4_PROMISCUOUS;\r |
| 1033 | }\r |
| 1034 | }\r |
| 1035 | }\r |
| 1036 | \r |
| 1037 | if (LocalType == 0) {\r |
| 1038 | return 0;\r |
| 1039 | }\r |
| 1040 | \r |
| 1041 | //\r |
| 1042 | // Iterate through the ip instances on the interface, enqueue\r |
| 1043 | // the packet if filter passed. Save the original cast type,\r |
| 1044 | // and pass the local cast type to the IP children on the\r |
| 1045 | // interface. The global cast type will be restored later.\r |
| 1046 | //\r |
| 1047 | SavedType = Info->CastType;\r |
| 1048 | Info->CastType = LocalType;\r |
| 1049 | \r |
| 1050 | Enqueued = 0;\r |
| 1051 | \r |
| 1052 | NET_LIST_FOR_EACH (Entry, &IpIf->IpInstances) {\r |
| 1053 | IpInstance = NET_LIST_USER_STRUCT (Entry, IP4_PROTOCOL, AddrLink);\r |
| 1054 | NET_CHECK_SIGNATURE (IpInstance, IP4_PROTOCOL_SIGNATURE);\r |
| 1055 | \r |
| 1056 | if (Ip4InstanceEnquePacket (IpInstance, Head, Packet) == EFI_SUCCESS) {\r |
| 1057 | Enqueued++;\r |
| 1058 | }\r |
| 1059 | }\r |
| 1060 | \r |
| 1061 | Info->CastType = SavedType;\r |
| 1062 | return Enqueued;\r |
| 1063 | }\r |
| 1064 | \r |
| 1065 | \r |
| 1066 | /**\r |
| 1067 | Deliver the packet for each IP4 child on the interface.\r |
| 1068 | \r |
| 3e8c18da |
1069 | @param[in] IpSb The IP4 service instance that received the packet\r |
| 1070 | @param[in] IpIf The IP4 interface to deliver the packet.\r |
| 772db4bb |
1071 | \r |
| 1072 | @retval EFI_SUCCESS It always returns EFI_SUCCESS now\r |
| 1073 | \r |
| 1074 | **/\r |
| 1075 | EFI_STATUS\r |
| 1076 | Ip4InterfaceDeliverPacket (\r |
| 1077 | IN IP4_SERVICE *IpSb,\r |
| 1078 | IN IP4_INTERFACE *IpIf\r |
| 1079 | )\r |
| 1080 | {\r |
| 1081 | IP4_PROTOCOL *Ip4Instance;\r |
| e48e37fc |
1082 | LIST_ENTRY *Entry;\r |
| 772db4bb |
1083 | \r |
| 1084 | NET_LIST_FOR_EACH (Entry, &IpIf->IpInstances) {\r |
| 1085 | Ip4Instance = NET_LIST_USER_STRUCT (Entry, IP4_PROTOCOL, AddrLink);\r |
| 1086 | Ip4InstanceDeliverPacket (Ip4Instance);\r |
| 1087 | }\r |
| 1088 | \r |
| 1089 | return EFI_SUCCESS;\r |
| 1090 | }\r |
| 1091 | \r |
| 1092 | \r |
| 1093 | /**\r |
| 1094 | Demultiple the packet. the packet delivery is processed in two\r |
| 1095 | passes. The first pass will enque a shared copy of the packet\r |
| 1096 | to each IP4 child that accepts the packet. The second pass will\r |
| 1097 | deliver a non-shared copy of the packet to each IP4 child that\r |
| 1098 | has pending receive requests. Data is copied if more than one\r |
| 96e1079f |
1099 | child wants to consume the packet because each IP child needs\r |
| 772db4bb |
1100 | its own copy of the packet to make changes.\r |
| 1101 | \r |
| 3e8c18da |
1102 | @param[in] IpSb The IP4 service instance that received the packet\r |
| 1103 | @param[in] Head The header of the received packet\r |
| 1104 | @param[in] Packet The data of the received packet\r |
| 772db4bb |
1105 | \r |
| 1106 | @retval EFI_NOT_FOUND No IP child accepts the packet\r |
| 1107 | @retval EFI_SUCCESS The packet is enqueued or delivered to some IP\r |
| 1108 | children.\r |
| 1109 | \r |
| 1110 | **/\r |
| 1111 | EFI_STATUS\r |
| 1112 | Ip4Demultiplex (\r |
| 1113 | IN IP4_SERVICE *IpSb,\r |
| 1114 | IN IP4_HEAD *Head,\r |
| 1115 | IN NET_BUF *Packet\r |
| 1116 | )\r |
| 1117 | {\r |
| e48e37fc |
1118 | LIST_ENTRY *Entry;\r |
| 772db4bb |
1119 | IP4_INTERFACE *IpIf;\r |
| 1120 | INTN Enqueued;\r |
| 1121 | \r |
| 1122 | //\r |
| 1123 | // Two pass delivery: first, enque a shared copy of the packet\r |
| 1124 | // to each instance that accept the packet.\r |
| 1125 | //\r |
| 1126 | Enqueued = 0;\r |
| 1127 | \r |
| 1128 | NET_LIST_FOR_EACH (Entry, &IpSb->Interfaces) {\r |
| 1129 | IpIf = NET_LIST_USER_STRUCT (Entry, IP4_INTERFACE, Link);\r |
| 1130 | \r |
| 1131 | if (IpIf->Configured) {\r |
| 1132 | Enqueued += Ip4InterfaceEnquePacket (IpSb, Head, Packet, IpIf);\r |
| 1133 | }\r |
| 1134 | }\r |
| 1135 | \r |
| 1136 | //\r |
| 1137 | // Second: deliver a duplicate of the packet to each instance.\r |
| 1138 | // Release the local reference first, so that the last instance\r |
| 1139 | // getting the packet will not copy the data.\r |
| 1140 | //\r |
| 1141 | NetbufFree (Packet);\r |
| 1142 | \r |
| 1143 | if (Enqueued == 0) {\r |
| 1144 | return EFI_NOT_FOUND;\r |
| 1145 | }\r |
| 1146 | \r |
| 1147 | NET_LIST_FOR_EACH (Entry, &IpSb->Interfaces) {\r |
| 1148 | IpIf = NET_LIST_USER_STRUCT (Entry, IP4_INTERFACE, Link);\r |
| 1149 | \r |
| 1150 | if (IpIf->Configured) {\r |
| 1151 | Ip4InterfaceDeliverPacket (IpSb, IpIf);\r |
| 1152 | }\r |
| 1153 | }\r |
| 1154 | \r |
| 1155 | return EFI_SUCCESS;\r |
| 1156 | }\r |
| 1157 | \r |
| 1158 | \r |
| 1159 | /**\r |
| 1160 | Timeout the fragment and enqueued packets.\r |
| 1161 | \r |
| 3e8c18da |
1162 | @param[in] IpSb The IP4 service instance to timeout\r |
| 772db4bb |
1163 | \r |
| 1164 | **/\r |
| 1165 | VOID\r |
| 1166 | Ip4PacketTimerTicking (\r |
| 1167 | IN IP4_SERVICE *IpSb\r |
| 1168 | )\r |
| 1169 | {\r |
| e48e37fc |
1170 | LIST_ENTRY *InstanceEntry;\r |
| 1171 | LIST_ENTRY *Entry;\r |
| 1172 | LIST_ENTRY *Next;\r |
| 772db4bb |
1173 | IP4_PROTOCOL *IpInstance;\r |
| 1174 | IP4_ASSEMBLE_ENTRY *Assemble;\r |
| 1175 | NET_BUF *Packet;\r |
| 1176 | IP4_CLIP_INFO *Info;\r |
| 1177 | UINT32 Index;\r |
| 1178 | \r |
| 1179 | //\r |
| 1180 | // First, time out the fragments. The packet's life is counting down\r |
| 1181 | // once the first-arrived fragment was received.\r |
| 1182 | //\r |
| 1183 | for (Index = 0; Index < IP4_ASSEMLE_HASH_SIZE; Index++) {\r |
| 1184 | NET_LIST_FOR_EACH_SAFE (Entry, Next, &IpSb->Assemble.Bucket[Index]) {\r |
| 1185 | Assemble = NET_LIST_USER_STRUCT (Entry, IP4_ASSEMBLE_ENTRY, Link);\r |
| 1186 | \r |
| 1187 | if ((Assemble->Life > 0) && (--Assemble->Life == 0)) {\r |
| e48e37fc |
1188 | RemoveEntryList (Entry);\r |
| 772db4bb |
1189 | Ip4FreeAssembleEntry (Assemble);\r |
| 1190 | }\r |
| 1191 | }\r |
| 1192 | }\r |
| 1193 | \r |
| 1194 | NET_LIST_FOR_EACH (InstanceEntry, &IpSb->Children) {\r |
| 1195 | IpInstance = NET_LIST_USER_STRUCT (InstanceEntry, IP4_PROTOCOL, Link);\r |
| 1196 | \r |
| 1197 | //\r |
| 1198 | // Second, time out the assembled packets enqueued on each IP child.\r |
| 1199 | //\r |
| 1200 | NET_LIST_FOR_EACH_SAFE (Entry, Next, &IpInstance->Received) {\r |
| 1201 | Packet = NET_LIST_USER_STRUCT (Entry, NET_BUF, List);\r |
| 1202 | Info = IP4_GET_CLIP_INFO (Packet);\r |
| 1203 | \r |
| 1204 | if ((Info->Life > 0) && (--Info->Life == 0)) {\r |
| e48e37fc |
1205 | RemoveEntryList (Entry);\r |
| 772db4bb |
1206 | NetbufFree (Packet);\r |
| 1207 | }\r |
| 1208 | }\r |
| 1209 | \r |
| 1210 | //\r |
| 1211 | // Third: time out the transmitted packets.\r |
| 1212 | //\r |
| 1213 | NetMapIterate (&IpInstance->TxTokens, Ip4SentPacketTicking, NULL);\r |
| 1214 | }\r |
| 1215 | }\r |
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