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Add EDNS0_SUBNET rewrite (#1022)

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* Add EDNS0_SUBNET rewrite

* Fix review comments

* Update comment

* Fix according to review comments

* Add ResponseWriter6 instead of parameterized the existing ResponseWriter
This commit is contained in:
Thong Huynh
2017-09-08 13:36:09 -07:00
committed by Miek Gieben
parent bcdc99ab11
commit 8e5d0a23fa
4 changed files with 276 additions and 1 deletions
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17
middleware/rewrite/README.md
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@@ -37,7 +37,7 @@ Using FIELD edns0, you can set, append, or replace specific EDNS0 options on the
* `append` will add the option regardless of what options already exist
* `set` will modify a matching option or add one if none is found
Currently supported are `EDNS0_LOCAL` and `EDNS0_NSID`.
Currently supported are `EDNS0_LOCAL`, `EDNS0_NSID` and `EDNS0_SUBNET`.
### `EDNS0_LOCAL`
@@ -74,3 +74,18 @@ rewrite edns0 local set 0xffee {client_ip}
This has no fields; it will add an NSID option with an empty string for the NSID. If the option already exists
and the action is `replace` or `set`, then the NSID in the option will be set to the empty string.
### `EDNS0_SUBNET`
This has two fields, IPv4 bitmask length and IPv6 bitmask length. The bitmask
length is used to extract the client subnet from the source IP address in the query.
Example:
~~~
rewrite edns0 subnet set 24 56
~~~
* If the query has source IP as IPv4, the first 24 bits in the IP will be the network subnet.
* If the query has source IP as IPv6, the first 56 bits in the IP will be the network subnet.