networkd: add IPv6ProxyNDPAddress support (#5174)

IPv6 Neighbor discovery proxy is the IPv6 equivalent to proxy ARP for IPv4.
It is required when ISPs do not unconditional route IPv6 subnets
to their designated target, but expect neighbor solicitation messages
for every address on a link.

A variable IPv6ProxyNDPAddress= is introduced to the [Network] section,
each representing a IPv6 neighbour proxy entry in the neighbour table.

1 files changed, 44 insertions, 0 deletions

diff --git a/src/network/networkd-ipv6-proxy-ndp.h b/src/network/networkd-ipv6-proxy-ndp.h
new file mode 100644
index 0000000000..f09169f40f
--- /dev/null
+++ b/src/network/networkd-ipv6-proxy-ndp.h
@@ -0,0 +1,44 @@
+#pragma once
+
+/***
+  This file is part of systemd.
+
+  Copyright 2017 Florian Klink <flokli@flokli.de>
+
+  systemd is free software; you can redistribute it and/or modify it
+  under the terms of the GNU Lesser General Public License as published by
+  the Free Software Foundation; either version 2.1 of the License, or
+  (at your option) any later version.
+
+  systemd is distributed in the hope that it will be useful, but
+  WITHOUT ANY WARRANTY; without even the implied warranty of
+  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+  Lesser General Public License for more details.
+
+  You should have received a copy of the GNU Lesser General Public License
+  along with systemd; If not, see <http://www.gnu.org/licenses/>.
+***/
+
+#include "list.h"
+#include "macro.h"
+
+typedef struct Network Network;
+typedef struct IPv6ProxyNDPAddress IPv6ProxyNDPAddress;
+typedef struct Link Link;
+
+struct IPv6ProxyNDPAddress {
+    Network *network;
+    struct in6_addr in_addr;
+
+    LIST_FIELDS(IPv6ProxyNDPAddress, ipv6_proxy_ndp_addresses);
+};
+
+
+int ipv6_proxy_ndp_address_new_static(Network *network, IPv6ProxyNDPAddress ** ipv6_proxy_ndp_address);
+void ipv6_proxy_ndp_address_free(IPv6ProxyNDPAddress *ipv6_proxy_ndp_address);
+int ipv6_proxy_ndp_address_configure(Link *link, IPv6ProxyNDPAddress *ipv6_proxy_ndp_address);
+int ipv6_proxy_ndp_addresses_configure(Link *link);
+
+DEFINE_TRIVIAL_CLEANUP_FUNC(IPv6ProxyNDPAddress*, ipv6_proxy_ndp_address_free);
+
+int config_parse_ipv6_proxy_ndp_address(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);