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772db4bb | 1 | /** @file\r |
2 | \r | |
3 | Copyright (c) 2004, 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 | PxeDhcp4Release.c\r | |
14 | \r | |
15 | Abstract:\r | |
16 | Transmit release packet, free allocations and shutdown PxeDhcp4.\r | |
17 | \r | |
18 | \r | |
19 | **/\r | |
20 | \r | |
21 | \r | |
22 | #include "PxeDhcp4.h"\r | |
23 | \r | |
24 | /* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - */\r | |
25 | EFI_STATUS\r | |
26 | EFIAPI\r | |
27 | PxeDhcp4Release (\r | |
28 | IN EFI_PXE_DHCP4_PROTOCOL *This\r | |
29 | )\r | |
30 | {\r | |
31 | PXE_DHCP4_PRIVATE_DATA *Private;\r | |
32 | EFI_IP_ADDRESS ServerIp;\r | |
33 | EFI_IP_ADDRESS client_ip;\r | |
34 | EFI_IP_ADDRESS gateway_ip;\r | |
35 | EFI_IP_ADDRESS subnet_mask;\r | |
36 | EFI_STATUS efi_status;\r | |
37 | DHCP4_OP *op;\r | |
38 | UINT8 op_list[20];\r | |
39 | \r | |
40 | //\r | |
41 | // Check for invalid parameters.\r | |
42 | //\r | |
43 | if (This == NULL) {\r | |
44 | return EFI_INVALID_PARAMETER;\r | |
45 | }\r | |
46 | //\r | |
47 | // Release does nothing if the protocol has never been setup.\r | |
48 | //\r | |
49 | if (This->Data == NULL) {\r | |
50 | return EFI_NOT_STARTED;\r | |
51 | }\r | |
52 | //\r | |
53 | // Fail if we do not have valid instance data.\r | |
54 | //\r | |
55 | Private = PXE_DHCP4_PRIVATE_DATA_FROM_THIS (This);\r | |
56 | \r | |
57 | if (Private == NULL) {\r | |
58 | return EFI_INVALID_PARAMETER;\r | |
59 | }\r | |
60 | \r | |
61 | if (Private->PxeBc == NULL) {\r | |
62 | return EFI_DEVICE_ERROR;\r | |
63 | }\r | |
64 | //\r | |
65 | // If this is a BOOTP session and there is not a DHCP Ack\r | |
66 | // packet, just release storage and return.\r | |
67 | //\r | |
68 | if (This->Data->IsBootp || !This->Data->IsAck) {\r | |
69 | gBS->FreePool (This->Data);\r | |
70 | This->Data = NULL;\r | |
71 | \r | |
72 | if (Private->StopPxeBc) {\r | |
73 | Private->PxeBc->Stop (Private->PxeBc);\r | |
74 | }\r | |
75 | \r | |
76 | return EFI_SUCCESS;\r | |
77 | }\r | |
78 | //\r | |
79 | // Build option list for DHCP Release packet.\r | |
80 | // If any errors occur, just release storage and return.\r | |
81 | //\r | |
82 | //\r | |
83 | // Message type is first.\r | |
84 | //\r | |
85 | op_list[0] = DHCP4_MESSAGE_TYPE;\r | |
86 | op_list[1] = 1;\r | |
87 | op_list[2] = DHCP4_MESSAGE_TYPE_RELEASE;\r | |
88 | \r | |
89 | //\r | |
90 | // Followed by server identifier.\r | |
91 | //\r | |
92 | efi_status = find_opt (\r | |
93 | &This->Data->Request,\r | |
94 | DHCP4_SERVER_IDENTIFIER,\r | |
95 | 0,\r | |
96 | &op\r | |
97 | );\r | |
98 | \r | |
99 | if (EFI_ERROR (efi_status)) {\r | |
100 | gBS->FreePool (This->Data);\r | |
101 | This->Data = NULL;\r | |
102 | \r | |
103 | if (Private->StopPxeBc) {\r | |
104 | Private->PxeBc->Stop (Private->PxeBc);\r | |
105 | }\r | |
106 | \r | |
107 | return EFI_SUCCESS;\r | |
108 | }\r | |
109 | \r | |
110 | if (op->len != 4) {\r | |
111 | gBS->FreePool (This->Data);\r | |
112 | This->Data = NULL;\r | |
113 | \r | |
114 | if (Private->StopPxeBc) {\r | |
115 | Private->PxeBc->Stop (Private->PxeBc);\r | |
116 | }\r | |
117 | \r | |
118 | return EFI_SUCCESS;\r | |
119 | }\r | |
120 | \r | |
121 | CopyMem (&ServerIp, op->data, 4);\r | |
122 | \r | |
123 | op_list[3] = DHCP4_SERVER_IDENTIFIER;\r | |
124 | op_list[4] = 4;\r | |
125 | CopyMem (&op_list[5], &ServerIp, 4);\r | |
126 | \r | |
127 | //\r | |
128 | // Followed by end.\r | |
129 | //\r | |
130 | op_list[9] = DHCP4_END;\r | |
131 | \r | |
132 | //\r | |
133 | // We need a subnet mask for IP stack operation.\r | |
134 | //\r | |
135 | efi_status = find_opt (\r | |
136 | &This->Data->AckNak,\r | |
137 | DHCP4_SUBNET_MASK,\r | |
138 | 0,\r | |
139 | &op\r | |
140 | );\r | |
141 | \r | |
142 | if (EFI_ERROR (efi_status)) {\r | |
143 | gBS->FreePool (This->Data);\r | |
144 | This->Data = NULL;\r | |
145 | \r | |
146 | if (Private->StopPxeBc) {\r | |
147 | Private->PxeBc->Stop (Private->PxeBc);\r | |
148 | }\r | |
149 | \r | |
150 | return EFI_SUCCESS;\r | |
151 | }\r | |
152 | \r | |
153 | if (op->len != 4) {\r | |
154 | gBS->FreePool (This->Data);\r | |
155 | This->Data = NULL;\r | |
156 | \r | |
157 | if (Private->StopPxeBc) {\r | |
158 | Private->PxeBc->Stop (Private->PxeBc);\r | |
159 | }\r | |
160 | \r | |
161 | return EFI_SUCCESS;\r | |
162 | }\r | |
163 | \r | |
164 | ZeroMem (&subnet_mask, sizeof (EFI_IP_ADDRESS));\r | |
165 | CopyMem (&subnet_mask, op->data, 4);\r | |
166 | \r | |
167 | //\r | |
168 | // Gateway IP address may be needed.\r | |
169 | //\r | |
170 | ZeroMem (&gateway_ip, sizeof (EFI_IP_ADDRESS));\r | |
171 | CopyMem (&gateway_ip, &This->Data->AckNak.dhcp4.giaddr, 4);\r | |
172 | \r | |
173 | //\r | |
174 | // Client IP address needed for IP stack operation.\r | |
175 | //\r | |
176 | ZeroMem (&client_ip, sizeof (EFI_IP_ADDRESS));\r | |
177 | CopyMem (&client_ip, &This->Data->AckNak.dhcp4.yiaddr, 4);\r | |
178 | \r | |
179 | //\r | |
180 | // Enable UDP...\r | |
181 | //\r | |
182 | efi_status = start_udp (Private, &client_ip, &subnet_mask);\r | |
183 | \r | |
184 | if (EFI_ERROR (efi_status)) {\r | |
185 | gBS->FreePool (This->Data);\r | |
186 | This->Data = NULL;\r | |
187 | \r | |
188 | if (Private->StopPxeBc) {\r | |
189 | Private->PxeBc->Stop (Private->PxeBc);\r | |
190 | }\r | |
191 | \r | |
192 | return efi_status;\r | |
193 | }\r | |
194 | //\r | |
195 | // Gather information out of DHCP request packet needed for\r | |
196 | // DHCP release packet.\r | |
197 | //\r | |
198 | //\r | |
199 | // Setup DHCP Release packet.\r | |
200 | //\r | |
201 | CopyMem (&This->Data->Request.dhcp4.ciaddr, &client_ip, 4);\r | |
202 | \r | |
203 | ZeroMem (&This->Data->Request.dhcp4.yiaddr, 12);\r | |
204 | \r | |
205 | ZeroMem (&This->Data->Request.dhcp4.sname, 64 + 128);\r | |
206 | \r | |
207 | This->Data->Request.dhcp4.hops = 0;\r | |
208 | This->Data->Request.dhcp4.secs = 0;\r | |
209 | This->Data->Request.dhcp4.flags = 0;\r | |
210 | \r | |
211 | ZeroMem (\r | |
212 | &This->Data->Request.dhcp4.options,\r | |
213 | sizeof This->Data->Request.dhcp4.options\r | |
214 | );\r | |
215 | \r | |
216 | CopyMem (&This->Data->Request.dhcp4.options, op_list, 10);\r | |
217 | \r | |
218 | //\r | |
219 | // Transmit DHCP Release packet.\r | |
220 | //\r | |
221 | tx_udp (\r | |
222 | Private,\r | |
223 | &ServerIp,\r | |
224 | &gateway_ip,\r | |
225 | &client_ip,\r | |
226 | &This->Data->Request,\r | |
227 | DHCP4_MAX_PACKET_SIZE - (DHCP4_UDP_HEADER_SIZE + DHCP4_IP_HEADER_SIZE)\r | |
228 | );\r | |
229 | \r | |
230 | gBS->Stall (1000000); /* 1/10th second */\r | |
231 | \r | |
232 | //\r | |
233 | // Shutdown PXE BaseCode and release local storage.\r | |
234 | //\r | |
235 | stop_udp (Private);\r | |
236 | \r | |
237 | gBS->FreePool (This->Data);\r | |
238 | This->Data = NULL;\r | |
239 | \r | |
240 | if (Private->StopPxeBc) {\r | |
241 | Private->PxeBc->Stop (Private->PxeBc);\r | |
242 | }\r | |
243 | \r | |
244 | return EFI_SUCCESS;\r | |
245 | }\r | |
246 | \r | |
247 | /* eof - PxeDhcp4Release.c */\r |