networkd: add support for IPv6 tokens

This allows the admin to set the host-specific part of IPv6 addresses, but still
receive the prefix via SLAAC.

.network file snippet:

[Network]
IPv6Token=::12

gives:

$ ip token
token ::12 dev eth0

This closes https://bugs.freedesktop.org/show_bug.cgi?id=81177.

1 files changed, 6 insertions, 0 deletions

diff --git a/src/network/networkd.h b/src/network/networkd.h
index 4f3bcf36f9..6fb920b158 100644
--- a/src/network/networkd.h
+++ b/src/network/networkd.h
@@ -128,6 +128,7 @@ struct Network {
         unsigned dhcp_route_metric;
         AddressFamilyBoolean link_local;
         bool ipv4ll_route;
+        union in_addr_union ipv6_token;
 
         bool dhcp_server;
 
@@ -405,6 +406,11 @@ int config_parse_ipv4ll(const char *unit, const char *filename, unsigned line,
                         const char *section, unsigned section_line, const char *lvalue,
                         int ltype, const char *rvalue, void *data, void *userdata);
 
+/* IPv6 support */
+int config_parse_token(const char *unit, const char *filename, unsigned line,
+                       const char *section, unsigned section_line, const char *lvalue,
+                       int ltype, const char *rvalue, void *data, void *userdata);
+
 /* LLMNR support */
 
 const char* llmnr_support_to_string(LLMNRSupport i) _const_;