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diff --git a/usr/src/man/man4/overlay_files.4 b/usr/src/man/man4/overlay_files.4 new file mode 100644 index 0000000000..c1a4ce4b3b --- /dev/null +++ b/usr/src/man/man4/overlay_files.4 @@ -0,0 +1,169 @@ +.\" +.\" This file and its contents are supplied under the terms of the +.\" Common Development and Distribution License ("CDDL"), version 1.0. +.\" You may only use this file in accordance with the terms of version +.\" 1.0 of the CDDL. +.\" +.\" A full copy of the text of the CDDL should have accompanied this +.\" source. A copy of the CDDL is also available via the Internet at +.\" http://www.illumos.org/license/CDDL. +.\" +.\" +.\" Copyright 2015, Joyent, Inc. +.\" +.Dd Apr 13, 2015 +.Dt OVERLAY_FILES 4 +.Os +.Sh NAME +.Nm overlay_files +.Nd Overlay files plugin file format +.Sh DESCRIPTION +The +.Sy files +plugin provides a means for a dynamic overlay where the destinations are +determined based on a static description contained in a +.Sy JSON +file. This manual describes the format of the file used by the +.Sy files/config +property. To create and manage overlays +with the +.Sy files +plugin, use +.Xr dladm 1M . +For more information on overlays, see +.Xr overlay 5 . +.Pp +Using the +.Sy files +module, a static and simple overlay network can be created. This network +does not support the use of +.Em broadcast +or +.Em multicast +traffic. Both ARP and NDP traffic are proxied by the plugin itself. In +addition, the plugin allows for DHCP. Instead of providing a traditional +DHCP proxy, when an initial DHCP broadcast goes out to a broadcast +address, it will get rewritten to target a specific MAC address. The +.Sy files +plugin is useful as proof of concept and for simple static networks +where addresses do not need to be reconfigured. If more advanced +topologies or more streamlined updates are required, consider a different +plugin. +.Pp +The file format is encoded as a series of +.Sy JSON +objects. Each object has a key, which is a MAC address on the +.Sy overlay +network. It has multiple values, some required, some optional, which +describe various properties. The valid properties are: +.Bl -hang -width Ds +.It Sy ip +.Bd -filled -compact +The +.Sy ip +key indicates the IP address on the +.Sy underlay +network that houses the MAC address in question. Packets directed for +the MAC address will be encapsulated and set to this address. This field +is required. +.Pp +The value is a +.Em JSON String . +Both IPv4 and IPv6 addresses are supported and should be written out in their +traditional forms. Follow the guidelines for writing addresses in +.Xr inet_aton 3SOCKET . +.Ed +.It Sy port +.Bd -filled -compact +The +.Sy port +key indicates the port on the +.Sy underlay +network that houses the MAC address in question. This property is required if +the encapsulation module requires a port for its destination. The value is +a +.Em JSON Number . +.Ed +.It Sy arp +.Bd -filled -compact +The +.Sy arp +key stores the IPv4 address that corresponds to this MAC address on the +.Sy overlay +network. This will be used to respond to ARP queries that would traditionally +have been received by the OS kernel. If this address is not present, no IPv4 +packets directed to this IP address will be received by the network interface +that has this MAC address, regardless of what is configured on top of it. +.Pp +The value is a +.Em JSON String +and should be written out following the guidelines for IPv4 addresses in +.Xr inet_aton 3SOCKET . +.Ed +.It Sy ndp +.Bd -filled -compact +The +.Sy ndp +key stores the IPv6 address that corresponds to this MAC address on the +.Sy overlay +network. This will be used to respond to NDP queries that would traditionally +have been received by the OS kernel. If this address is not present, no IPv6 +packets directed to this IP address will be received by the network interface +that has this MAC address, regardless of what is configured on top of it. +.Pp +The value is a +.Em JSON String +and should be written out following the guidelines for IPv6 addresses in +.Xr inet_aton 3SOCKET . +.Ed +.It Sy dhcp-proxy +.Bd -filled -compact +The +.Sy dhcp-proxy +key stores a MAC address that DHCP messages directed to a broadcast address get +rewritten to be sent to. This can be viewed as a form of proxy DHCP, but is +different in mechanism from a traditional proxy. The value is a +.Em JSON String +and should be written as a traditional MAC address string as described by +.Xr ether_aton 3SOCKET . +.Ed +.El +.Sh EXAMPLES +.Sy Example 1 +Sample configuration file +.Pp +This configuration file provides information for three different MAC +addresses. Each MAC address has an entry which describes what its IPv4 +and IPv6 address is, as well as the IP address and port of the host on +the underlay network. Finally, one host has a DHCP proxy entry to +demonstrate how one might configure DHCP. +.Bd -literal -offset indent +{ + "de:ad:be:ef:00:00": { + "arp": "10.55.55.2", + "ip": "10.88.88.69", + "ndp": "fe80::3", + "port": 4789 + }, + "de:ad:be:ef:00:01": { + "arp": "10.55.55.3", + "dhcp-proxy": "de:ad:be:ef:00:00", + "ip": "10.88.88.70", + "ndp": "fe80::4", + "port": 4789 + }, + "de:ad:be:ef:00:02": { + "arp": "10.55.55.4", + "ip": "10.88.88.71", + "ndp": "fe80::5", + "port": 4789 + } +} +.Ed +.Sh STABILITY +This file format is +.Sy committed ; +however, keys that are not listed here are reserved for future use. +.Sh SEE ALSO +.Xr dladm 1M +.Xr overlay 5 |