On 2021-05-06, Radek <r...@int.pl> wrote:
> Hello,
> I want to use dhcpd server to push Wireless Controller's IP address to the
> APs.
>
> According to this:
> http://systemnetworksecurity.blogspot.com/2013/02/adding-custom-options-in-isc-dhcpds.html
> https://www.secuvera.de/blog/capwap-dhcp-option-138-auf-isc-dhcpd-server-einrichten/
> I need to add *option capwap* to /etc/dhcpd.conf
>
> option capwap code 138 = ip-address; #Custom Option capwap
> option capwap 192.168.1.110; #WLAN-Controller-IP
>
> I can't find the capwap option in dhcp-options(5) i OpenBSD.
> How can I do what I need using other options/configuration?
> Thanks!
It's a proper RFC protocol so we could add it to dhcpd. Possible
diff below, maybe it should be moved to the named part of
dhcp_option_default_priority too but there are other named options
which aren't listed so I've left that out for now.
CAPWAP is RFC5415, the DHCP option is defined in RFC5417.
Index: dhcp-options.5
===================================================================
RCS file: /cvs/src/usr.sbin/dhcpd/dhcp-options.5,v
retrieving revision 1.31
diff -u -p -r1.31 dhcp-options.5
--- dhcp-options.5 8 May 2019 22:00:55 -0000 1.31
+++ dhcp-options.5 7 May 2021 08:38:48 -0000
@@ -169,6 +169,13 @@ Some DHCP clients will support it, and o
This option specifies the broadcast address in use on the client's subnet.
Legal values for broadcast addresses are specified in section 3.2.1.3 of
RFC 1122.
+.It Ic option capwap-ac Ar ip-address Oo , Ar ip-address ... Oc ;
+The
+.Ic capwap-ac
+option specifies a list of IP addresses of Wireless Access Controllers.
+These are used by Wireless Termination Points using the Control And
+Provisioning of Wireless Access Points (CAPWAP) protocol, RFC 5415.
+Addresses should be listed in order of preference.
.It Ic option classless-static-routes Ar cidr ip-address Oo , Ar cidr
ip-address ... Oc ;
This option specifies a list of destination networks and the
associated gateways.
Index: dhcp.h
===================================================================
RCS file: /cvs/src/usr.sbin/dhcpd/dhcp.h,v
retrieving revision 1.11
diff -u -p -r1.11 dhcp.h
--- dhcp.h 8 May 2019 22:00:55 -0000 1.11
+++ dhcp.h 7 May 2021 08:38:48 -0000
@@ -173,6 +173,7 @@ struct dhcp_packet {
#define DHO_NDS_CONTEXT 87
#define DHO_DOMAIN_SEARCH 119
#define DHO_CLASSLESS_STATIC_ROUTES 121
+#define DHO_CAPWAP_AC 138
#define DHO_TFTP_CONFIG_FILE 144
#define DHO_VOIP_CONFIGURATION_SERVER 150
#define DHO_CLASSLESS_MS_STATIC_ROUTES 249
Index: tables.c
===================================================================
RCS file: /cvs/src/usr.sbin/dhcpd/tables.c,v
retrieving revision 1.14
diff -u -p -r1.14 tables.c
--- tables.c 8 May 2019 22:00:55 -0000 1.14
+++ tables.c 7 May 2021 08:38:48 -0000
@@ -214,7 +214,7 @@ struct option dhcp_options[256] = {
{ "option-135", "X", &dhcp_universe, 135 },
{ "option-136", "X", &dhcp_universe, 136 },
{ "option-137", "X", &dhcp_universe, 137 },
- { "option-138", "X", &dhcp_universe, 138 },
+ { "capwap-ac", "lA", &dhcp_universe, 138 },
{ "option-139", "X", &dhcp_universe, 139 },
{ "option-140", "X", &dhcp_universe, 140 },
{ "option-141", "X", &dhcp_universe, 141 },
@@ -404,6 +404,8 @@ unsigned char dhcp_option_default_priori
DHO_NETBIOS_SCOPE,
DHO_FONT_SERVERS,
DHO_X_DISPLAY_MANAGER,
+ DHO_CAPWAP_AC,
+ DHO_VOIP_CONFIGURATION_SERVER,
DHO_DHCP_PARAMETER_REQUEST_LIST,
DHO_DHCP_USER_CLASS_ID,
DHO_RELAY_AGENT_INFORMATION, /* Should be the last option. */
@@ -417,9 +419,9 @@ unsigned char dhcp_option_default_priori
100, 101, 102, 103, 104, 105, 106, 107, 108, 109,
110, 111, 112, 113, 114, 115, 116, 117, 118,
120, 122, 123, 124, 125, 126, 127, 128, 129,
- 130, 131, 132, 133, 134, 135, 136, 137, 138, 139,
+ 130, 131, 132, 133, 134, 135, 136, 137, 139,
140, 141, 142, 143, 144, 145, 146, 147, 148, 149,
- 150, 151, 152, 153, 154, 155, 156, 157, 158, 159,
+ 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,
