network: introduce ip nexthop routing

Used to manipulate entries in the kernel's nexthop tables.
Example:
```
[NextHop]
Id=3
Gateway=192.168.5.1
```

1 files changed, 50 insertions, 0 deletions

diff --git a/src/network/networkd-nexthop.h b/src/network/networkd-nexthop.h
new file mode 100644
index 0000000000..28cbdad738
--- /dev/null
+++ b/src/network/networkd-nexthop.h
@@ -0,0 +1,50 @@
+/* SPDX-License-Identifier: LGPL-2.1+
+ * Copyright © 2019 VMware, Inc.
+ */
+
+#pragma once
+
+#include "conf-parser.h"
+#include "macro.h"
+
+typedef struct NextHop NextHop;
+typedef struct NetworkConfigSection NetworkConfigSection;
+
+#include "networkd-network.h"
+#include "networkd-util.h"
+
+struct NextHop {
+        Network *network;
+        NetworkConfigSection *section;
+
+        Link *link;
+
+        unsigned char protocol;
+
+        int family;
+        uint32_t oif;
+        uint32_t id;
+
+        union in_addr_union gw;
+
+        LIST_FIELDS(NextHop, nexthops);
+};
+
+extern const struct hash_ops nexthop_hash_ops;
+
+int nexthop_new(NextHop **ret);
+void nexthop_free(NextHop *nexthop);
+int nexthop_configure(NextHop *nexthop, Link *link, link_netlink_message_handler_t callback);
+int nexthop_remove(NextHop *nexthop, Link *link, link_netlink_message_handler_t callback);
+
+int nexthop_get(Link *link, NextHop *in, NextHop **ret);
+int nexthop_add(Link *link, NextHop *in, NextHop **ret);
+int nexthop_add_foreign(Link *link, NextHop *in, NextHop **ret);
+bool nexthop_equal(NextHop *r1, NextHop *r2);
+
+int nexthop_section_verify(NextHop *nexthop);
+
+DEFINE_NETWORK_SECTION_FUNCTIONS(NextHop, nexthop_free);
+
+CONFIG_PARSER_PROTOTYPE(config_parse_nexthop_id);
+CONFIG_PARSER_PROTOTYPE(config_parse_nexthop_gateway);