1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
|
/*++
Copyright (c) 2006 - 2007, Intel Corporation
All rights reserved. This program and the accompanying materials
are licensed and made available under the terms and conditions of the BSD License
which accompanies this distribution. The full text of the license may be found at
http://opensource.org/licenses/bsd-license.php
THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
Module Name:
PxeDhcp4Run.c
Abstract:
Simplified entry point for starting basic PxeDhcp4 client operation.
--*/
#include "PxeDhcp4.h"
/* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - */
EFI_STATUS
EFIAPI
PxeDhcp4Run (
IN EFI_PXE_DHCP4_PROTOCOL *This,
IN OPTIONAL UINTN OpLen,
IN OPTIONAL VOID *OpList
)
{
PXE_DHCP4_PRIVATE_DATA *Private;
DHCP4_PACKET *offer_list;
EFI_STATUS efi_status;
EFI_IP_ADDRESS zero_ip;
UINTN offers;
UINTN timeout;
UINTN n;
UINT16 seconds;
//
// Validate parameters.
//
if (This == NULL || (OpLen != 0 && OpList == NULL) || (OpLen == 0 && OpList != NULL)) {
return EFI_INVALID_PARAMETER;
}
for (n = 0; n < OpLen;) {
switch (((UINT8 *) OpList)[n]) {
case DHCP4_PAD:
++n;
continue;
case DHCP4_END:
++n;
break;
default:
n += 2 + ((UINT8 *) OpList)[n + 1];
continue;
}
break;
}
if (n != OpLen) {
return EFI_INVALID_PARAMETER;
}
//
// Get pointer to instance data.
//
Private = PXE_DHCP4_PRIVATE_DATA_FROM_THIS (This);
if (Private == NULL) {
return EFI_INVALID_PARAMETER;
}
if (Private->PxeBc == NULL) {
return EFI_DEVICE_ERROR;
}
//
// Initialize DHCP discover packet.
//
efi_status = PxeDhcp4Setup (This, NULL);
if (EFI_ERROR (efi_status)) {
return efi_status;
}
for (n = 0; n < OpLen;) {
switch (((UINT8 *) OpList)[n]) {
case DHCP4_PAD:
++n;
continue;
case DHCP4_END:
++n;
break;
default:
efi_status = add_opt (
&This->Data->Discover,
(DHCP4_OP *) &(((UINT8 *) OpList)[n])
);
if (EFI_ERROR (efi_status)) {
return efi_status;
}
n += 2 + ((UINT8 *) OpList)[n + 1];
continue;
}
break;
}
//
// Basic DHCP D.O.R.A.
// 1, 2, 4, 8, 16 & 32 second timeouts.
// Callback routine can be used to break out earlier.
//
ZeroMem (&zero_ip, sizeof (EFI_IP_ADDRESS));
for (timeout = 1;;) {
//
// Broadcast DHCP discover and wait for DHCP offers.
//
efi_status = PxeDhcp4Init (This, timeout, &offers, &offer_list);
if ((efi_status != EFI_NO_RESPONSE) &&
(efi_status != EFI_TIMEOUT) &&
(efi_status != EFI_SUCCESS)) {
return efi_status;
}
//
// Try to select from each DHCP or BOOTP offer.
//
for (n = 0; n < offers; ++n) {
//
// Ignore proxyDHCP offers.
//
if (!CompareMem (&offer_list[n].dhcp4.yiaddr, &zero_ip, 4)) {
continue;
}
//
// Issue DHCP Request and wait for DHCP Ack/Nak.
//
efi_status = PxeDhcp4Select (
This,
timeout,
&offer_list[n]
);
if (EFI_ERROR (efi_status)) {
continue;
}
//
// Exit when we have got our DHCP Ack.
//
if (This->Data->IsAck) {
return EFI_SUCCESS;
}
}
//
// No DHCP Acks. Release DHCP Offer list storage.
//
if (offer_list != NULL) {
FreePool (offer_list);
offer_list = NULL;
}
//
// Try again until we have used up >= DHCP4_MAX_SECONDS.
//
if ((timeout <<= 1) > DHCP4_MAX_SECONDS) {
if (!EFI_ERROR (efi_status)) {
efi_status = EFI_TIMEOUT;
}
return efi_status;
}
//
// Next timeout value.
//
CopyMem (&seconds, &This->Data->Discover.dhcp4.secs, 2);
seconds = htons (htons (seconds) + timeout);
CopyMem (&This->Data->Discover.dhcp4.secs, &seconds, 2);
}
}
/* eof - PxeDhcp4Run.c */
|
