blob: 90fb313b505a3d5982706c68ce547a78c9f45f39
1 | # |
2 | # For a description of the syntax of this configuration file, |
3 | # see scripts/kbuild/config-language.txt. |
4 | # |
5 | |
6 | INSERT |
7 | |
8 | config UDHCPD |
9 | bool "udhcp server (udhcpd)" |
10 | default y |
11 | select PLATFORM_LINUX |
12 | help |
13 | udhcpd is a DHCP server geared primarily toward embedded systems, |
14 | while striving to be fully functional and RFC compliant. |
15 | |
16 | config DHCPRELAY |
17 | bool "dhcprelay" |
18 | default y |
19 | help |
20 | dhcprelay listens for dhcp requests on one or more interfaces |
21 | and forwards these requests to a different interface or dhcp |
22 | server. |
23 | |
24 | config DUMPLEASES |
25 | bool "Lease display utility (dumpleases)" |
26 | default y |
27 | help |
28 | dumpleases displays the leases written out by the udhcpd server. |
29 | Lease times are stored in the file by time remaining in lease, or |
30 | by the absolute time that it expires in seconds from epoch. |
31 | |
32 | config FEATURE_UDHCPD_WRITE_LEASES_EARLY |
33 | bool "Rewrite the lease file at every new acknowledge" |
34 | default y |
35 | depends on UDHCPD |
36 | help |
37 | If selected, udhcpd will write a new file with leases every |
38 | time a new lease has been accepted, thus eliminating the need |
39 | to send SIGUSR1 for the initial writing or updating. Any timed |
40 | rewriting remains undisturbed. |
41 | |
42 | config FEATURE_UDHCPD_BASE_IP_ON_MAC |
43 | bool "Select IP address based on client MAC" |
44 | default n |
45 | depends on UDHCPD |
46 | help |
47 | If selected, udhcpd will base its selection of IP address to offer |
48 | on the client's hardware address. Otherwise udhcpd uses the next |
49 | consecutive free address. |
50 | |
51 | This reduces the frequency of IP address changes for clients |
52 | which let their lease expire, and makes consecutive DHCPOFFERS |
53 | for the same client to (almost always) contain the same |
54 | IP address. |
55 | |
56 | config DHCPD_LEASES_FILE |
57 | string "Absolute path to lease file" |
58 | default "/var/lib/misc/udhcpd.leases" |
59 | depends on UDHCPD |
60 | help |
61 | udhcpd stores addresses in a lease file. This is the absolute path |
62 | of the file. Normally it is safe to leave it untouched. |
63 | |
64 | config UDHCPC |
65 | bool "udhcp client (udhcpc)" |
66 | default y |
67 | select PLATFORM_LINUX |
68 | help |
69 | udhcpc is a DHCP client geared primarily toward embedded systems, |
70 | while striving to be fully functional and RFC compliant. |
71 | |
72 | The udhcp client negotiates a lease with the DHCP server and |
73 | runs a script when a lease is obtained or lost. |
74 | |
75 | config FEATURE_UDHCPC_ARPING |
76 | bool "Verify that the offered address is free, using ARP ping" |
77 | default y |
78 | depends on UDHCPC |
79 | help |
80 | If selected, udhcpc will send ARP probes and make sure |
81 | the offered address is really not in use by anyone. The client |
82 | will DHCPDECLINE the offer if the address is in use, |
83 | and restart the discover process. |
84 | |
85 | config FEATURE_UDHCPC_SANITIZEOPT |
86 | bool "Do not pass malformed host and domain names" |
87 | default y |
88 | depends on UDHCPC |
89 | help |
90 | If selected, udhcpc will check some options (such as option 12 - |
91 | hostname) and if they don't look like valid hostnames |
92 | (for example, if they start with dash or contain spaces), |
93 | they will be replaced with string "bad" when exporting |
94 | to the environment. |
95 | |
96 | config FEATURE_UDHCP_PORT |
97 | bool "Enable '-P port' option for udhcpd and udhcpc" |
98 | default n |
99 | depends on UDHCPD || UDHCPC |
100 | help |
101 | At the cost of ~300 bytes, enables -P port option. |
102 | This feature is typically not needed. |
103 | |
104 | config UDHCP_DEBUG |
105 | int "Maximum verbosity level for udhcp applets (0..9)" |
106 | default 9 |
107 | range 0 9 |
108 | depends on UDHCPD || UDHCPC || DHCPRELAY |
109 | help |
110 | Verbosity can be increased with multiple -v options. |
111 | This option controls how high it can be cranked up. |
112 | |
113 | Bigger values result in bigger code. Levels above 1 |
114 | are very verbose and useful for debugging only. |
115 | |
116 | config FEATURE_UDHCP_RFC3397 |
117 | bool "Support for RFC3397 domain search (experimental)" |
118 | default y |
119 | depends on UDHCPD || UDHCPC |
120 | help |
121 | If selected, both client and server will support passing of domain |
122 | search lists via option 119, specified in RFC 3397, |
123 | and SIP servers option 120, specified in RFC 3361. |
124 | |
125 | config FEATURE_UDHCP_8021Q |
126 | bool "Support for 802.1Q VLAN parameters" |
127 | default y |
128 | depends on UDHCPD || UDHCPC |
129 | help |
130 | If selected, both client and server will support passing of VLAN |
131 | ID and priority via options 132 and 133 as per 802.1Q. |
132 | |
133 | config UDHCPC_DEFAULT_SCRIPT |
134 | string "Absolute path to config script" |
135 | default "/usr/share/udhcpc/default.script" |
136 | depends on UDHCPC |
137 | help |
138 | This script is called after udhcpc receives an answer. See |
139 | examples/udhcp for a working example. Normally it is safe |
140 | to leave this untouched. |
141 | |
142 | config UDHCPC_SLACK_FOR_BUGGY_SERVERS |
143 | int "DHCP options slack buffer size" |
144 | default 80 |
145 | range 0 924 |
146 | depends on UDHCPD || UDHCPC |
147 | help |
148 | Some buggy DHCP servers send DHCP offer packets with option |
149 | field larger than we expect (which might also be considered a |
150 | buffer overflow attempt). These packets are normally discarded. |
151 | If circumstances beyond your control force you to support such |
152 | servers, this may help. The upper limit (924) makes dhcpc accept |
153 | even 1500 byte packets (maximum-sized ethernet packets). |
154 | |
155 | This option does not make dhcp[cd] emit non-standard |
156 | sized packets. |
157 | |
158 | Known buggy DHCP servers: |
159 | 3Com OfficeConnect Remote 812 ADSL Router: |
160 | seems to confuse maximum allowed UDP packet size with |
161 | maximum size of entire IP packet, and sends packets which are |
162 | 28 bytes too large. |
163 | Seednet (ISP) VDSL: sends packets 2 bytes too large. |
164 |