| 1 | #
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| 2 | # For a description of the syntax of this configuration file,
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| 3 | # see scripts/kbuild/config-language.txt.
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| 4 | #
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| 5 |
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| 6 | INSERT
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| 7 |
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| 8 | config UDHCPD
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| 9 | bool "udhcp server (udhcpd)"
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| 10 | default y
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| 11 | select PLATFORM_LINUX
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| 12 | help
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| 13 | udhcpd is a DHCP server geared primarily toward embedded systems,
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| 14 | while striving to be fully functional and RFC compliant.
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| 15 |
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| 16 | config DHCPRELAY
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| 17 | bool "dhcprelay"
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| 18 | default y
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| 19 | depends on UDHCPD
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| 20 | help
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| 21 | dhcprelay listens for dhcp requests on one or more interfaces
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| 22 | and forwards these requests to a different interface or dhcp
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| 23 | server.
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| 24 |
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| 25 | config DUMPLEASES
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| 26 | bool "Lease display utility (dumpleases)"
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| 27 | default y
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| 28 | depends on UDHCPD
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| 29 | help
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| 30 | dumpleases displays the leases written out by the udhcpd server.
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| 31 | Lease times are stored in the file by time remaining in lease, or
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| 32 | by the absolute time that it expires in seconds from epoch.
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| 33 |
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| 34 | config FEATURE_UDHCPD_WRITE_LEASES_EARLY
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| 35 | bool "Rewrite the lease file at every new acknowledge"
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| 36 | default y
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| 37 | depends on UDHCPD
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| 38 | help
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| 39 | If selected, udhcpd will write a new file with leases every
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| 40 | time a new lease has been accepted, thus eliminating the need
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| 41 | to send SIGUSR1 for the initial writing or updating. Any timed
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| 42 | rewriting remains undisturbed.
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| 43 |
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| 44 | config FEATURE_UDHCPD_BASE_IP_ON_MAC
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| 45 | bool "Select IP address based on client MAC"
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| 46 | default n
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| 47 | depends on UDHCPD
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| 48 | help
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| 49 | If selected, udhcpd will base its selection of IP address to offer
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| 50 | on the client's hardware address. Otherwise udhcpd uses the next
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| 51 | consecutive free address.
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| 52 |
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| 53 | This reduces the frequency of IP address changes for clients
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| 54 | which let their lease expire, and makes consecutive DHCPOFFERS
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| 55 | for the same client to (almost always) contain the same
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| 56 | IP address.
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| 57 |
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| 58 | config DHCPD_LEASES_FILE
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| 59 | string "Absolute path to lease file"
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| 60 | default "/var/lib/misc/udhcpd.leases"
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| 61 | depends on UDHCPD
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| 62 | help
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| 63 | udhcpd stores addresses in a lease file. This is the absolute path
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| 64 | of the file. Normally it is safe to leave it untouched.
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| 65 |
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| 66 | config UDHCPC
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| 67 | bool "udhcp client (udhcpc)"
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| 68 | default y
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| 69 | select PLATFORM_LINUX
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| 70 | help
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| 71 | udhcpc is a DHCP client geared primarily toward embedded systems,
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| 72 | while striving to be fully functional and RFC compliant.
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| 73 |
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| 74 | The udhcp client negotiates a lease with the DHCP server and
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| 75 | runs a script when a lease is obtained or lost.
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| 76 |
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| 77 | config FEATURE_UDHCPC_ARPING
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| 78 | bool "Verify that the offered address is free, using ARP ping"
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| 79 | default y
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| 80 | depends on UDHCPC
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| 81 | help
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| 82 | If selected, udhcpc will send ARP probes and make sure
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| 83 | the offered address is really not in use by anyone. The client
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| 84 | will DHCPDECLINE the offer if the address is in use,
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| 85 | and restart the discover process.
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| 86 |
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| 87 | config FEATURE_UDHCPC_SANITIZEOPT
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| 88 | bool "Do not pass malformed host and domain names"
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| 89 | default y
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| 90 | depends on UDHCPC
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| 91 | help
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| 92 | If selected, udhcpc will check some options (such as option 12 -
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| 93 | hostname) and if they don't look like valid hostnames
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| 94 | (for example, if they start with dash or contain spaces),
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| 95 | they will be replaced with string "bad" when exporting
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| 96 | to the environment.
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| 97 |
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| 98 | config FEATURE_UDHCP_PORT
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| 99 | bool "Enable '-P port' option for udhcpd and udhcpc"
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| 100 | default n
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| 101 | depends on UDHCPD || UDHCPC
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| 102 | help
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| 103 | At the cost of ~300 bytes, enables -P port option.
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| 104 | This feature is typically not needed.
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| 105 |
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| 106 | config UDHCP_DEBUG
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| 107 | int "Maximum verbosity level for udhcp applets (0..9)"
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| 108 | default 9
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| 109 | range 0 9
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| 110 | depends on UDHCPD || UDHCPC || DHCPRELAY
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| 111 | help
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| 112 | Verbosity can be increased with multiple -v options.
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| 113 | This option controls how high it can be cranked up.
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| 114 |
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| 115 | Bigger values result in bigger code. Levels above 1
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| 116 | are very verbose and useful for debugging only.
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| 117 |
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| 118 | config FEATURE_UDHCP_RFC3397
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| 119 | bool "Support for RFC3397 domain search (experimental)"
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| 120 | default y
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| 121 | depends on UDHCPD || UDHCPC
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| 122 | help
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| 123 | If selected, both client and server will support passing of domain
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| 124 | search lists via option 119, specified in RFC 3397,
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| 125 | and SIP servers option 120, specified in RFC 3361.
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| 126 |
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| 127 | config FEATURE_UDHCP_8021Q
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| 128 | bool "Support for 802.1Q VLAN parameters"
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| 129 | default y
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| 130 | depends on UDHCPD || UDHCPC
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| 131 | help
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| 132 | If selected, both client and server will support passing of VLAN
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| 133 | ID and priority via options 132 and 133 as per 802.1Q.
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| 134 |
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| 135 | config UDHCPC_DEFAULT_SCRIPT
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| 136 | string "Absolute path to config script"
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| 137 | default "/usr/share/udhcpc/default.script"
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| 138 | depends on UDHCPC
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| 139 | help
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| 140 | This script is called after udhcpc receives an answer. See
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| 141 | examples/udhcp for a working example. Normally it is safe
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| 142 | to leave this untouched.
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| 143 |
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| 144 | config UDHCPC_SLACK_FOR_BUGGY_SERVERS
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| 145 | int "DHCP options slack buffer size"
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| 146 | default 80
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| 147 | range 0 924
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| 148 | depends on UDHCPD || UDHCPC
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| 149 | help
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| 150 | Some buggy DHCP servers send DHCP offer packets with option
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| 151 | field larger than we expect (which might also be considered a
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| 152 | buffer overflow attempt). These packets are normally discarded.
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| 153 | If circumstances beyond your control force you to support such
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| 154 | servers, this may help. The upper limit (924) makes dhcpc accept
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| 155 | even 1500 byte packets (maximum-sized ethernet packets).
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| 156 |
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| 157 | This option does not make dhcp[cd] emit non-standard
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| 158 | sized packets.
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| 159 |
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| 160 | Known buggy DHCP servers:
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| 161 | 3Com OfficeConnect Remote 812 ADSL Router:
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| 162 | seems to confuse maximum allowed UDP packet size with
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| 163 | maximum size of entire IP packet, and sends packets which are
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| 164 | 28 bytes too large.
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| 165 | Seednet (ISP) VDSL: sends packets 2 bytes too large.
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