[mirror_edk2.git] / MdeModulePkg / Universal / Network / Ip4ConfigDxe / NicIp4Variable.c

/** @file\r
\r
Copyright (c) 2006, Intel Corporation\r
All rights reserved. This program and the accompanying materials\r
are licensed and made available under the terms and conditions of the BSD License\r
which accompanies this distribution.  The full text of the license may be found at\r
http://opensource.org/licenses/bsd-license.php\r
\r
THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,\r
WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.\r
\r
Module Name:\r
\r
  NicIp4Variable.c\r
\r
Abstract:\r
\r
  Routines used to operate the Ip4 configure variable\r
\r
\r
**/\r
\r
\r
#include <Library/NetLib.h>\r
#include <Library/DebugLib.h>\r
#include <Library/BaseMemoryLib.h>\r
#include <Library/MemoryAllocationLib.h>\r
#include <Library/UefiBootServicesTableLib.h>\r
#include <Library/UefiRuntimeServicesTableLib.h>\r
\r
#include "NicIp4Variable.h"\r
\r
\r
/**\r
  Check whether the configure parameter is valid.\r
\r
  @param  NicConfig    The configure parameter to check\r
\r
  @return TRUE if the parameter is valid for the interface, otherwise FALSE.\r
\r
**/\r
BOOLEAN\r
Ip4ConfigIsValid (\r
  IN NIC_IP4_CONFIG_INFO    *NicConfig\r
  )\r
{\r
  EFI_IP4_IPCONFIG_DATA     *IpConfig;\r
  IP4_ADDR                  Station;\r
  IP4_ADDR                  Netmask;\r
  IP4_ADDR                  Gateway;\r
  UINT32                    Index;\r
\r
  IpConfig = &NicConfig->Ip4Info;\r
\r
  if (NicConfig->Source == IP4_CONFIG_SOURCE_STATIC) {\r
    //\r
    // Validate that the addresses are unicast and mask\r
    // is properly formated\r
    //\r
    Station = EFI_NTOHL (IpConfig->StationAddress);\r
    Netmask = EFI_NTOHL (IpConfig->SubnetMask);\r
\r
    if ((Netmask == 0) || !IP4_IS_VALID_NETMASK (Netmask) ||\r
        (Station == 0) || !Ip4IsUnicast (Station, Netmask)) {\r
      return FALSE;\r
    }\r
\r
    //\r
    // Validate that the next hops are on the connected network\r
    // or that is a direct route (Gateway == 0).\r
    //\r
    for (Index = 0; Index < IpConfig->RouteTableSize; Index++) {\r
      Gateway = EFI_NTOHL (IpConfig->RouteTable[Index].GatewayAddress);\r
\r
      if ((Gateway != 0) && (!IP4_NET_EQUAL (Station, Gateway, Netmask) ||\r
          !Ip4IsUnicast (Gateway, Netmask))) {\r
        return FALSE;\r
      }\r
    }\r
\r
    return TRUE;\r
  }\r
\r
  //\r
  // return false if it is an unkown configure source. Valid\r
  // sources are static and dhcp.\r
  //\r
  return (BOOLEAN) (NicConfig->Source == IP4_CONFIG_SOURCE_DHCP);\r
}\r
\r
\r
\r
/**\r
  Read the ip4 configure variable from the EFI variable\r
\r
  None\r
\r
  @return The IP4 configure read if it is there and is valid, otherwise NULL\r
\r
**/\r
IP4_CONFIG_VARIABLE *\r
Ip4ConfigReadVariable (\r
  VOID\r
  )\r
{\r
  IP4_CONFIG_VARIABLE       *Variable;\r
  EFI_STATUS                Status;\r
  UINTN                     Size;\r
  UINT16                    CheckSum;\r
\r
  //\r
  // Get the size of variable, then allocate a buffer to read the variable.\r
  //\r
  Size     = 0;\r
  Variable = NULL;\r
  Status   = gRT->GetVariable (\r
                    EFI_NIC_IP4_CONFIG_VARIABLE,\r
                    &gEfiNicIp4ConfigVariableGuid,\r
                    NULL,\r
                    &Size,\r
                    NULL\r
                    );\r
\r
  if (Status != EFI_BUFFER_TOO_SMALL) {\r
    return NULL;\r
  }\r
\r
  if (Size < sizeof (IP4_CONFIG_VARIABLE)) {\r
    goto REMOVE_VARIABLE;\r
  }\r
\r
  Variable = NetAllocatePool (Size);\r
\r
  if (Variable == NULL) {\r
    return NULL;\r
  }\r
\r
  Status = gRT->GetVariable (\r
                  EFI_NIC_IP4_CONFIG_VARIABLE,\r
                  &gEfiNicIp4ConfigVariableGuid,\r
                  NULL,\r
                  &Size,\r
                  Variable\r
                  );\r
\r
  if (EFI_ERROR (Status)) {\r
    goto ON_ERROR;\r
  }\r
\r
  //\r
  // Verify the checksum, variable size and count\r
  //\r
  CheckSum = (UINT16) (~NetblockChecksum ((UINT8 *) Variable, (UINT32)Size));\r
\r
  if ((CheckSum != 0) || (Size != Variable->Len)) {\r
    goto REMOVE_VARIABLE;\r
  }\r
\r
  if ((Variable->Count < 1) || (Variable->Count > MAX_IP4_CONFIG_IN_VARIABLE)) {\r
    goto REMOVE_VARIABLE;\r
  }\r
\r
  return Variable;\r
\r
REMOVE_VARIABLE:\r
  Ip4ConfigWriteVariable (NULL);\r
\r
ON_ERROR:\r
  if (Variable != NULL) {\r
    NetFreePool (Variable);\r
  }\r
\r
  return NULL;\r
}\r
\r
\r
/**\r
  Write the IP4 configure variable to the NVRAM. If Config\r
  is NULL, remove the variable.\r
\r
  @param  Config       The IP4 configure data to write\r
\r
  @retval EFI_SUCCESS  The variable is written to the NVRam\r
  @retval Others       Failed to write the variable.\r
\r
**/\r
EFI_STATUS\r
Ip4ConfigWriteVariable (\r
  IN IP4_CONFIG_VARIABLE    * Config        OPTIONAL\r
  )\r
{\r
  EFI_STATUS                Status;\r
\r
  Status = gRT->SetVariable (\r
                  EFI_NIC_IP4_CONFIG_VARIABLE,\r
                  &gEfiNicIp4ConfigVariableGuid,\r
                  IP4_CONFIG_VARIABLE_ATTRIBUTES,\r
                  (Config == NULL) ? 0 : Config->Len,\r
                  Config\r
                  );\r
\r
  return Status;\r
}\r
\r
\r
/**\r
  Locate the IP4 configure parameters from the variable.If a\r
  configuration is found, copy it to a newly allocated block\r
  of memory to avoid the alignment problem. Caller should\r
  release the memory after use.\r
\r
  @param  Variable     The IP4 configure variable to search in\r
  @param  NicAddr      The interface address to check\r
\r
  @return The point to the NIC's IP4 configure info if it is found\r
  @return in the IP4 variable, otherwise NULL.\r
\r
**/\r
NIC_IP4_CONFIG_INFO *\r
Ip4ConfigFindNicVariable (\r
  IN IP4_CONFIG_VARIABLE    *Variable,\r
  IN NIC_ADDR               *NicAddr\r
  )\r
{\r
  NIC_IP4_CONFIG_INFO       Temp;\r
  NIC_IP4_CONFIG_INFO       *Config;\r
  UINT32                    Index;\r
  UINT8                     *Cur;\r
  UINT32                    Len;\r
\r
  Cur = (UINT8*)&Variable->ConfigInfo;\r
\r
  for (Index = 0; Index < Variable->Count; Index++) {\r
    //\r
    // Copy the data to Temp to avoid the alignment problems\r
    //\r
    NetCopyMem (&Temp, Cur, sizeof (NIC_IP4_CONFIG_INFO));\r
    Len = SIZEOF_NIC_IP4_CONFIG_INFO (&Temp);\r
\r
    //\r
    // Found the matching configuration parameters, allocate\r
    // a block of memory then copy it out.\r
    //\r
    if (NIC_ADDR_EQUAL (&Temp.NicAddr, NicAddr)) {\r
      Config = NetAllocatePool (Len);\r
\r
      if (Config == NULL) {\r
        return NULL;\r
      }\r
\r
      NetCopyMem (Config, Cur, Len);\r
      return Config;\r
    }\r
\r
    Cur += Len;\r
  }\r
\r
  return NULL;\r
}\r
\r
\r
/**\r
  Modify the configuration parameter for the NIC in the variable.\r
  If Config is NULL, old configuration will be remove from the new\r
  variable. Otherwise, append it or replace the old one.\r
\r
  @param  Variable     The IP4 variable to change\r
  @param  NicAddr      The interface to search\r
  @param  Config       The new configuration parameter (NULL to remove the old)\r
\r
  @return The new IP4_CONFIG_VARIABLE variable if the new variable has at\r
  @return least one NIC configure and no EFI_OUT_OF_RESOURCES failure.\r
  @return Return NULL either because failed to locate memory for new variable\r
  @return or the only NIC configure is removed from the Variable.\r
\r
**/\r
IP4_CONFIG_VARIABLE *\r
Ip4ConfigModifyVariable (\r
  IN IP4_CONFIG_VARIABLE    *Variable,    OPTIONAL\r
  IN NIC_ADDR               *NicAddr,\r
  IN NIC_IP4_CONFIG_INFO    *Config       OPTIONAL\r
  )\r
{\r
  NIC_IP4_CONFIG_INFO       Temp;\r
  NIC_IP4_CONFIG_INFO       *Old;\r
  IP4_CONFIG_VARIABLE       *NewVar;\r
  UINT32                    Len;\r
  UINT32                    TotalLen;\r
  UINT32                    Count;\r
  UINT8                     *Next;\r
  UINT8                     *Cur;\r
  UINT32                    Index;\r
\r
  ASSERT ((Variable != NULL) || (Config != NULL));\r
\r
  //\r
  // Compute the total length\r
  //\r
  if (Variable != NULL) {\r
    //\r
    // Variable != NULL, then Config can be NULL or not.  and so is\r
    // the Old. If old configure exists, it is removed from the\r
    // Variable. New configure is append to the variable.\r
    //\r
    //\r
    Count     = Variable->Count;\r
    Cur       = (UINT8 *)&Variable->ConfigInfo;\r
    TotalLen  = Variable->Len;\r
\r
    Old       = Ip4ConfigFindNicVariable (Variable, NicAddr);\r
\r
    if (Old != NULL) {\r
      TotalLen -= SIZEOF_NIC_IP4_CONFIG_INFO (Old);\r
      NetFreePool (Old);\r
    }\r
\r
    if (Config != NULL) {\r
      TotalLen += SIZEOF_NIC_IP4_CONFIG_INFO (Config);\r
    }\r
\r
    //\r
    // Return NULL if the only NIC_IP4_CONFIG_INFO is being removed.\r
    //\r
    if (TotalLen < sizeof (IP4_CONFIG_VARIABLE)) {\r
      return NULL;\r
    }\r
\r
  } else {\r
    //\r
    // Variable == NULL and Config != NULL, Create a new variable with\r
    // this NIC configure.\r
    //\r
    Count     = 0;\r
    Cur       = NULL;\r
    TotalLen  = sizeof (IP4_CONFIG_VARIABLE) - sizeof (NIC_IP4_CONFIG_INFO)\r
                + SIZEOF_NIC_IP4_CONFIG_INFO (Config);\r
  }\r
\r
  ASSERT (TotalLen >= sizeof (IP4_CONFIG_VARIABLE));\r
\r
  NewVar = NetAllocateZeroPool (TotalLen);\r
\r
  if (NewVar == NULL) {\r
    return NULL;\r
  }\r
\r
  NewVar->Len = TotalLen;\r
\r
  //\r
  // Copy the other configure parameters from the old variable\r
  //\r
  Next = (UINT8 *)&NewVar->ConfigInfo;\r
\r
  for (Index = 0; Index < Count; Index++) {\r
    NetCopyMem (&Temp, Cur, sizeof (NIC_IP4_CONFIG_INFO));\r
    Len = SIZEOF_NIC_IP4_CONFIG_INFO (&Temp);\r
\r
    if (!NIC_ADDR_EQUAL (&Temp.NicAddr, NicAddr)) {\r
      NetCopyMem (Next, Cur, Len);\r
      Next += Len;\r
      NewVar->Count++;\r
    }\r
\r
    Cur += Len;\r
  }\r
\r
  //\r
  // Append the new configure if it isn't NULL.\r
  //\r
  Len = 0;\r
\r
  if (Config != NULL) {\r
    Len = SIZEOF_NIC_IP4_CONFIG_INFO (Config);\r
\r
    NetCopyMem (Next, Config, Len);\r
    NewVar->Count++;\r
  }\r
\r
  ASSERT (Next + Len == (UINT8 *) NewVar + TotalLen);\r
\r
  NewVar->CheckSum = (UINT16) (~NetblockChecksum ((UINT8 *) NewVar, TotalLen));\r
  return NewVar;\r
}\r
Commit	Line	Data
b2570da8	1	/** @file\r
	2	\r
	3	Copyright (c) 2006, Intel Corporation\r
	4	All rights reserved. This program and the accompanying materials\r
	5	are licensed and made available under the terms and conditions of the BSD License\r
	6	which accompanies this distribution. The full text of the license may be found at\r
	7	http://opensource.org/licenses/bsd-license.php\r
	8	\r
	9	THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,\r
	10	WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.\r
	11	\r
	12	Module Name:\r
	13	\r
	14	NicIp4Variable.c\r
	15	\r
	16	Abstract:\r
	17	\r
	18	Routines used to operate the Ip4 configure variable\r
	19	\r
	20	\r
	21	**/\r
	22	\r
	23	\r
	24	#include <Library/NetLib.h>\r
	25	#include <Library/DebugLib.h>\r
	26	#include <Library/BaseMemoryLib.h>\r
	27	#include <Library/MemoryAllocationLib.h>\r
	28	#include <Library/UefiBootServicesTableLib.h>\r
	29	#include <Library/UefiRuntimeServicesTableLib.h>\r
	30	\r
	31	#include "NicIp4Variable.h"\r
	32	\r
	33	\r
	34	/**\r
	35	Check whether the configure parameter is valid.\r
	36	\r
	37	@param NicConfig The configure parameter to check\r
	38	\r
	39	@return TRUE if the parameter is valid for the interface, otherwise FALSE.\r
	40	\r
	41	**/\r
	42	BOOLEAN\r
	43	Ip4ConfigIsValid (\r
	44	IN NIC_IP4_CONFIG_INFO *NicConfig\r
	45	)\r
	46	{\r
	47	EFI_IP4_IPCONFIG_DATA *IpConfig;\r
	48	IP4_ADDR Station;\r
	49	IP4_ADDR Netmask;\r
	50	IP4_ADDR Gateway;\r
	51	UINT32 Index;\r
	52	\r
	53	IpConfig = &NicConfig->Ip4Info;\r
	54	\r
	55	if (NicConfig->Source == IP4_CONFIG_SOURCE_STATIC) {\r
	56	//\r
	57	// Validate that the addresses are unicast and mask\r
	58	// is properly formated\r
	59	//\r
	60	Station = EFI_NTOHL (IpConfig->StationAddress);\r
	61	Netmask = EFI_NTOHL (IpConfig->SubnetMask);\r
	62	\r
	63	if ((Netmask == 0) \|\| !IP4_IS_VALID_NETMASK (Netmask) \|\|\r
	64	(Station == 0) \|\| !Ip4IsUnicast (Station, Netmask)) {\r
65	return FALSE;\r
66	}\r
67	\r
68	//\r
69	// Validate that the next hops are on the connected network\r
70	// or that is a direct route (Gateway == 0).\r
71	//\r
72	for (Index = 0; Index < IpConfig->RouteTableSize; Index++) {\r
73	Gateway = EFI_NTOHL (IpConfig->RouteTable[Index].GatewayAddress);\r
74	\r
75	if ((Gateway != 0) && (!IP4_NET_EQUAL (Station, Gateway, Netmask) \|\|\r
76	!Ip4IsUnicast (Gateway, Netmask))) {\r
77	return FALSE;\r
78	}\r
79	}\r
80	\r
81	return TRUE;\r
82	}\r
83	\r
84	//\r
85	// return false if it is an unkown configure source. Valid\r
86	// sources are static and dhcp.\r
87	//\r
88	return (BOOLEAN) (NicConfig->Source == IP4_CONFIG_SOURCE_DHCP);\r
89	}\r
90	\r
91	\r
92	\r
93	/**\r
94	Read the ip4 configure variable from the EFI variable\r
95	\r
96	None\r
97	\r
98	@return The IP4 configure read if it is there and is valid, otherwise NULL\r
99	\r
100	**/\r
101	IP4_CONFIG_VARIABLE *\r
102	Ip4ConfigReadVariable (\r
103	VOID\r
104	)\r
105	{\r
106	IP4_CONFIG_VARIABLE *Variable;\r
107	EFI_STATUS Status;\r
108	UINTN Size;\r
109	UINT16 CheckSum;\r
110	\r
111	//\r
112	// Get the size of variable, then allocate a buffer to read the variable.\r
113	//\r
114	Size = 0;\r
115	Variable = NULL;\r
116	Status = gRT->GetVariable (\r
117	EFI_NIC_IP4_CONFIG_VARIABLE,\r
118	&gEfiNicIp4ConfigVariableGuid,\r
119	NULL,\r
120	&Size,\r
121	NULL\r
122	);\r
123	\r
124	if (Status != EFI_BUFFER_TOO_SMALL) {\r
125	return NULL;\r
126	}\r
127	\r
128	if (Size < sizeof (IP4_CONFIG_VARIABLE)) {\r
129	goto REMOVE_VARIABLE;\r
130	}\r
131	\r
132	Variable = NetAllocatePool (Size);\r
133	\r
134	if (Variable == NULL) {\r
135	return NULL;\r
136	}\r
137	\r
138	Status = gRT->GetVariable (\r
139	EFI_NIC_IP4_CONFIG_VARIABLE,\r
140	&gEfiNicIp4ConfigVariableGuid,\r
141	NULL,\r
142	&Size,\r
143	Variable\r
144	);\r
145	\r
146	if (EFI_ERROR (Status)) {\r
147	goto ON_ERROR;\r
148	}\r
149	\r
150	//\r
151	// Verify the checksum, variable size and count\r
152	//\r
4eb65aff	153	CheckSum = (UINT16) (~NetblockChecksum ((UINT8 *) Variable, (UINT32)Size));\r
b2570da8	154	\r
	155	if ((CheckSum != 0) \|\| (Size != Variable->Len)) {\r
	156	goto REMOVE_VARIABLE;\r
	157	}\r
	158	\r
	159	if ((Variable->Count < 1) \|\| (Variable->Count > MAX_IP4_CONFIG_IN_VARIABLE)) {\r
	160	goto REMOVE_VARIABLE;\r
	161	}\r
	162	\r
	163	return Variable;\r
	164	\r
	165	REMOVE_VARIABLE:\r
	166	Ip4ConfigWriteVariable (NULL);\r
	167	\r
	168	ON_ERROR:\r
	169	if (Variable != NULL) {\r
	170	NetFreePool (Variable);\r
	171	}\r
	172	\r
	173	return NULL;\r
	174	}\r
	175	\r
	176	\r
	177	/**\r
	178	Write the IP4 configure variable to the NVRAM. If Config\r
	179	is NULL, remove the variable.\r
	180	\r
	181	@param Config The IP4 configure data to write\r
	182	\r
	183	@retval EFI_SUCCESS The variable is written to the NVRam\r
	184	@retval Others Failed to write the variable.\r
	185	\r
	186	**/\r
	187	EFI_STATUS\r
	188	Ip4ConfigWriteVariable (\r
	189	IN IP4_CONFIG_VARIABLE * Config OPTIONAL\r
	190	)\r
	191	{\r
	192	EFI_STATUS Status;\r
	193	\r
	194	Status = gRT->SetVariable (\r
	195	EFI_NIC_IP4_CONFIG_VARIABLE,\r
	196	&gEfiNicIp4ConfigVariableGuid,\r
	197	IP4_CONFIG_VARIABLE_ATTRIBUTES,\r
	198	(Config == NULL) ? 0 : Config->Len,\r
	199	Config\r
	200	);\r
	201	\r
	202	return Status;\r
	203	}\r
	204	\r
	205	\r
	206	/**\r
	207	Locate the IP4 configure parameters from the variable.If a\r
	208	configuration is found, copy it to a newly allocated block\r
	209	of memory to avoid the alignment problem. Caller should\r
	210	release the memory after use.\r
	211	\r
	212	@param Variable The IP4 configure variable to search in\r
	213	@param NicAddr The interface address to check\r
	214	\r
	215	@return The point to the NIC's IP4 configure info if it is found\r
	216	@return in the IP4 variable, otherwise NULL.\r
	217	\r
218	**/\r
219	NIC_IP4_CONFIG_INFO *\r
220	Ip4ConfigFindNicVariable (\r
221	IN IP4_CONFIG_VARIABLE *Variable,\r
222	IN NIC_ADDR *NicAddr\r
223	)\r
224	{\r
225	NIC_IP4_CONFIG_INFO Temp;\r
226	NIC_IP4_CONFIG_INFO *Config;\r
227	UINT32 Index;\r
228	UINT8 *Cur;\r
229	UINT32 Len;\r
230	\r
231	Cur = (UINT8*)&Variable->ConfigInfo;\r
232	\r
233	for (Index = 0; Index < Variable->Count; Index++) {\r
234	//\r
235	// Copy the data to Temp to avoid the alignment problems\r
236	//\r
237	NetCopyMem (&Temp, Cur, sizeof (NIC_IP4_CONFIG_INFO));\r
238	Len = SIZEOF_NIC_IP4_CONFIG_INFO (&Temp);\r
239	\r
240	//\r
241	// Found the matching configuration parameters, allocate\r
242	// a block of memory then copy it out.\r
243	//\r
244	if (NIC_ADDR_EQUAL (&Temp.NicAddr, NicAddr)) {\r
245	Config = NetAllocatePool (Len);\r
246	\r
247	if (Config == NULL) {\r
248	return NULL;\r
249	}\r
250	\r
251	NetCopyMem (Config, Cur, Len);\r
252	return Config;\r
253	}\r
254	\r
255	Cur += Len;\r
256	}\r
257	\r
258	return NULL;\r
259	}\r
260	\r
261	\r
262	/**\r
263	Modify the configuration parameter for the NIC in the variable.\r
264	If Config is NULL, old configuration will be remove from the new\r
265	variable. Otherwise, append it or replace the old one.\r
266	\r
267	@param Variable The IP4 variable to change\r
268	@param NicAddr The interface to search\r
269	@param Config The new configuration parameter (NULL to remove the old)\r
270	\r
271	@return The new IP4_CONFIG_VARIABLE variable if the new variable has at\r
272	@return least one NIC configure and no EFI_OUT_OF_RESOURCES failure.\r
273	@return Return NULL either because failed to locate memory for new variable\r
274	@return or the only NIC configure is removed from the Variable.\r
275	\r
276	**/\r
277	IP4_CONFIG_VARIABLE *\r
278	Ip4ConfigModifyVariable (\r
279	IN IP4_CONFIG_VARIABLE *Variable, OPTIONAL\r
280	IN NIC_ADDR *NicAddr,\r
281	IN NIC_IP4_CONFIG_INFO *Config OPTIONAL\r
282	)\r
283	{\r
284	NIC_IP4_CONFIG_INFO Temp;\r
285	NIC_IP4_CONFIG_INFO *Old;\r
286	IP4_CONFIG_VARIABLE *NewVar;\r
287	UINT32 Len;\r
288	UINT32 TotalLen;\r
289	UINT32 Count;\r
290	UINT8 *Next;\r
291	UINT8 *Cur;\r
292	UINT32 Index;\r
293	\r
294	ASSERT ((Variable != NULL) \|\| (Config != NULL));\r
295	\r
296	//\r
297	// Compute the total length\r
298	//\r
299	if (Variable != NULL) {\r
300	//\r
301	// Variable != NULL, then Config can be NULL or not. and so is\r
302	// the Old. If old configure exists, it is removed from the\r
303	// Variable. New configure is append to the variable.\r
304	//\r
305	//\r
306	Count = Variable->Count;\r
307	Cur = (UINT8 *)&Variable->ConfigInfo;\r
308	TotalLen = Variable->Len;\r
309	\r
310	Old = Ip4ConfigFindNicVariable (Variable, NicAddr);\r
311	\r
312	if (Old != NULL) {\r
313	TotalLen -= SIZEOF_NIC_IP4_CONFIG_INFO (Old);\r
314	NetFreePool (Old);\r
315	}\r
316	\r
317	if (Config != NULL) {\r
318	TotalLen += SIZEOF_NIC_IP4_CONFIG_INFO (Config);\r
319	}\r
320	\r
321	//\r
322	// Return NULL if the only NIC_IP4_CONFIG_INFO is being removed.\r
323	//\r
324	if (TotalLen < sizeof (IP4_CONFIG_VARIABLE)) {\r
325	return NULL;\r
326	}\r
327	\r
328	} else {\r
329	//\r
330	// Variable == NULL and Config != NULL, Create a new variable with\r
331	// this NIC configure.\r
332	//\r
333	Count = 0;\r
334	Cur = NULL;\r
335	TotalLen = sizeof (IP4_CONFIG_VARIABLE) - sizeof (NIC_IP4_CONFIG_INFO)\r
336	+ SIZEOF_NIC_IP4_CONFIG_INFO (Config);\r
337	}\r
338	\r
339	ASSERT (TotalLen >= sizeof (IP4_CONFIG_VARIABLE));\r
340	\r
341	NewVar = NetAllocateZeroPool (TotalLen);\r
342	\r
343	if (NewVar == NULL) {\r
344	return NULL;\r
345	}\r
346	\r
347	NewVar->Len = TotalLen;\r
348	\r
349	//\r
350	// Copy the other configure parameters from the old variable\r
351	//\r
352	Next = (UINT8 *)&NewVar->ConfigInfo;\r
353	\r
354	for (Index = 0; Index < Count; Index++) {\r
355	NetCopyMem (&Temp, Cur, sizeof (NIC_IP4_CONFIG_INFO));\r
356	Len = SIZEOF_NIC_IP4_CONFIG_INFO (&Temp);\r
357	\r
358	if (!NIC_ADDR_EQUAL (&Temp.NicAddr, NicAddr)) {\r
359	NetCopyMem (Next, Cur, Len);\r
360	Next += Len;\r
361	NewVar->Count++;\r
362	}\r
363	\r
364	Cur += Len;\r
365	}\r
366	\r
367	//\r
368	// Append the new configure if it isn't NULL.\r
369	//\r
370	Len = 0;\r
371	\r
372	if (Config != NULL) {\r
373	Len = SIZEOF_NIC_IP4_CONFIG_INFO (Config);\r
374	\r
375	NetCopyMem (Next, Config, Len);\r
376	NewVar->Count++;\r
377	}\r
378	\r
379	ASSERT (Next + Len == (UINT8 *) NewVar + TotalLen);\r
380	\r
4eb65aff	381	NewVar->CheckSum = (UINT16) (~NetblockChecksum ((UINT8 *) NewVar, TotalLen));\r
b2570da8	382	return NewVar;\r
b2570da8	383	}\r