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Babel: Implement IPv4 via IPv6 extension (RFC 9229)

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The patch implements an IPv4 via IPv6 extension (RFC 9229) to the Babel
routing protocol (RFC 8966) that allows annoncing routes to an IPv4
prefix with an IPv6 next hop, which makes it possible for IPv4 traffic
to flow through interfaces that have not been assigned an IPv4 address.

The implementation is compatible with the current Babeld version.

Thanks to Toke Høiland-Jørgensen for early review on this work.

Minor changes from committer.
This commit is contained in:
Andreas Rammhold
2023-02-14 16:17:03 +01:00
committed by Ondrej Zajicek
parent 0851fcde65
commit eecc3f02e4
5 changed files with 118 additions and 41 deletions
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doc/bird.sgml
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@@ -1929,6 +1929,7 @@ protocol babel [<name>] {
check link <switch>;
next hop ipv4 <address>;
next hop ipv6 <address>;
extended next hop <switch>;
authentication none|mac [permissive];
password "&lt;text&gt;";
password "&lt;text&gt;" {
@@ -2033,6 +2034,11 @@ protocol babel [<name>] {
source for Babel packets will be used. In normal operation, it should not
be necessary to set this option.
<tag><label id="babel-extended-next-hop">extended next hop <m/switch/</tag>
If enabled, BIRD will accept and emit IPv4 routes with an IPv6 next
hop when IPv4 addresses are absent from the interface as described in
<rfc id="9229">. Default: yes.
<tag><label id="babel-authentication">authentication none|mac [permissive]</tag>
Selects authentication method to be used. <cf/none/ means that packets
are not authenticated at all, <cf/mac/ means MAC authentication is