]>
Commit | Line | Data |
---|---|---|
772db4bb | 1 | /** @file\r |
2 | \r | |
3 | Copyright (c) 2004 - 2007, 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 | PxeDhcp4Run.c\r | |
14 | \r | |
15 | Abstract:\r | |
16 | Simplified entry point for starting basic PxeDhcp4 client operation.\r | |
17 | \r | |
18 | \r | |
19 | **/\r | |
20 | \r | |
21 | \r | |
22 | #include "PxeDhcp4.h"\r | |
23 | \r | |
24 | EFI_STATUS\r | |
25 | EFIAPI\r | |
26 | PxeDhcp4Run (\r | |
27 | IN EFI_PXE_DHCP4_PROTOCOL *This,\r | |
28 | IN OPTIONAL UINTN OpLen,\r | |
29 | IN OPTIONAL VOID *OpList\r | |
30 | )\r | |
31 | {\r | |
32 | PXE_DHCP4_PRIVATE_DATA *Private;\r | |
33 | DHCP4_PACKET *offer_list;\r | |
34 | EFI_STATUS efi_status;\r | |
35 | EFI_IP_ADDRESS zero_ip;\r | |
36 | UINTN offers;\r | |
37 | UINTN timeout;\r | |
38 | UINTN n;\r | |
39 | UINT16 seconds;\r | |
40 | \r | |
41 | //\r | |
42 | // Validate parameters.\r | |
43 | //\r | |
44 | if (This == NULL || (OpLen != 0 && OpList == NULL) || (OpLen == 0 && OpList != NULL)) {\r | |
45 | return EFI_INVALID_PARAMETER;\r | |
46 | }\r | |
47 | \r | |
48 | for (n = 0; n < OpLen;) {\r | |
49 | switch (((UINT8 *) OpList)[n]) {\r | |
50 | case DHCP4_PAD:\r | |
51 | ++n;\r | |
52 | continue;\r | |
53 | \r | |
54 | case DHCP4_END:\r | |
55 | ++n;\r | |
56 | break;\r | |
57 | \r | |
58 | default:\r | |
59 | n += 2 + ((UINT8 *) OpList)[n + 1];\r | |
60 | continue;\r | |
61 | }\r | |
62 | \r | |
63 | break;\r | |
64 | }\r | |
65 | \r | |
66 | if (n != OpLen) {\r | |
67 | return EFI_INVALID_PARAMETER;\r | |
68 | }\r | |
69 | //\r | |
70 | // Get pointer to instance data.\r | |
71 | //\r | |
72 | Private = PXE_DHCP4_PRIVATE_DATA_FROM_THIS (This);\r | |
73 | \r | |
74 | if (Private == NULL) {\r | |
75 | return EFI_INVALID_PARAMETER;\r | |
76 | }\r | |
77 | \r | |
78 | if (Private->PxeBc == NULL) {\r | |
79 | return EFI_DEVICE_ERROR;\r | |
80 | }\r | |
81 | //\r | |
82 | // Initialize DHCP discover packet.\r | |
83 | //\r | |
84 | efi_status = PxeDhcp4Setup (This, NULL);\r | |
85 | \r | |
86 | if (EFI_ERROR (efi_status)) {\r | |
87 | return efi_status;\r | |
88 | }\r | |
89 | \r | |
90 | for (n = 0; n < OpLen;) {\r | |
91 | switch (((UINT8 *) OpList)[n]) {\r | |
92 | case DHCP4_PAD:\r | |
93 | ++n;\r | |
94 | continue;\r | |
95 | \r | |
96 | case DHCP4_END:\r | |
97 | ++n;\r | |
98 | break;\r | |
99 | \r | |
100 | default:\r | |
101 | efi_status = add_opt (\r | |
102 | &This->Data->Discover,\r | |
103 | (DHCP4_OP *) &(((UINT8 *) OpList)[n])\r | |
104 | );\r | |
105 | \r | |
106 | if (EFI_ERROR (efi_status)) {\r | |
107 | return efi_status;\r | |
108 | }\r | |
109 | \r | |
110 | n += 2 + ((UINT8 *) OpList)[n + 1];\r | |
111 | continue;\r | |
112 | }\r | |
113 | \r | |
114 | break;\r | |
115 | }\r | |
116 | //\r | |
117 | // Basic DHCP D.O.R.A.\r | |
118 | // 1, 2, 4, 8, 16 & 32 second timeouts.\r | |
119 | // Callback routine can be used to break out earlier.\r | |
120 | //\r | |
121 | ZeroMem (&zero_ip, sizeof (EFI_IP_ADDRESS));\r | |
122 | \r | |
123 | for (timeout = 1;;) {\r | |
124 | //\r | |
125 | // Broadcast DHCP discover and wait for DHCP offers.\r | |
126 | //\r | |
127 | efi_status = PxeDhcp4Init (This, timeout, &offers, &offer_list);\r | |
128 | \r | |
129 | if ((efi_status != EFI_SUCCESS) &&\r | |
130 | (efi_status != EFI_TIMEOUT) &&\r | |
131 | (efi_status != EFI_NO_RESPONSE)) {\r | |
132 | return efi_status;\r | |
133 | }\r | |
134 | //\r | |
135 | // Try to select from each DHCP or BOOTP offer.\r | |
136 | //\r | |
137 | for (n = 0; n < offers; ++n) {\r | |
138 | //\r | |
139 | // Ignore proxyDHCP offers.\r | |
140 | //\r | |
141 | if (!CompareMem (&offer_list[n].dhcp4.yiaddr, &zero_ip, 4)) {\r | |
142 | continue;\r | |
143 | }\r | |
144 | //\r | |
145 | // Issue DHCP Request and wait for DHCP Ack/Nak.\r | |
146 | //\r | |
147 | efi_status = PxeDhcp4Select (\r | |
148 | This,\r | |
149 | timeout,\r | |
150 | &offer_list[n]\r | |
151 | );\r | |
152 | \r | |
153 | if (EFI_ERROR (efi_status)) {\r | |
154 | continue;\r | |
155 | }\r | |
156 | //\r | |
157 | // Exit when we have got our DHCP Ack.\r | |
158 | //\r | |
159 | if (This->Data->IsAck) {\r | |
160 | return EFI_SUCCESS;\r | |
161 | }\r | |
162 | }\r | |
163 | //\r | |
164 | // No DHCP Acks. Release DHCP Offer list storage.\r | |
165 | //\r | |
166 | if (offer_list != NULL) {\r | |
167 | gBS->FreePool (offer_list);\r | |
168 | offer_list = NULL;\r | |
169 | }\r | |
170 | //\r | |
171 | // Try again until we have used up >= DHCP4_MAX_SECONDS.\r | |
172 | //\r | |
173 | if ((timeout <<= 1) > DHCP4_MAX_SECONDS) {\r | |
174 | if (!EFI_ERROR (efi_status)) {\r | |
175 | efi_status = EFI_TIMEOUT;\r | |
176 | }\r | |
177 | \r | |
178 | return efi_status;\r | |
179 | }\r | |
180 | //\r | |
181 | // Next timeout value.\r | |
182 | //\r | |
183 | CopyMem (&seconds, &This->Data->Discover.dhcp4.secs, 2);\r | |
184 | \r | |
185 | seconds = htons (htons (seconds) + timeout);\r | |
186 | \r | |
187 | CopyMem (&This->Data->Discover.dhcp4.secs, &seconds, 2);\r | |
188 | }\r | |
189 | }\r | |
190 | \r | |
191 | /* eof - PxeDhcp4Run.c */\r |