sd-network: IPv4 link-local support [v2]

Implements IPv4LL with respect to RFC 3927
(http://tools.ietf.org/rfc/rfc3927.txt) and integrates it
with networkd. Majority of the IPv4LL state machine is
taken from avahi (http://avahi.org/) project's autoip.

IPv4LL can be enabled by IPv4LL=yes under [Network]
section of .network file.

IPv4LL works independent of DHCP but if DHCP lease is
aquired, then LL address will be dropped.

[tomegun: removed a trailing newline and a compiler warning]

1 files changed, 50 insertions, 0 deletions

diff --git a/src/systemd/sd-ipv4ll.h b/src/systemd/sd-ipv4ll.h
new file mode 100644
index 000000000..0207006ff
--- /dev/null
+++ b/src/systemd/sd-ipv4ll.h
@@ -0,0 +1,50 @@
+/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
+
+#ifndef foosdipv4llfoo
+#define foosdipv4llfoo
+
+/***
+  This file is part of systemd.
+
+  Copyright (C) 2014 Axis Communications AB. All rights reserved.
+
+  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 <netinet/in.h>
+#include <net/ethernet.h>
+
+#include "sd-event.h"
+
+enum {
+        IPV4LL_EVENT_STOP           = 0,
+        IPV4LL_EVENT_BIND           = 1,
+        IPV4LL_EVENT_CONFLICT       = 2,
+};
+
+typedef struct sd_ipv4ll sd_ipv4ll;
+typedef void (*sd_ipv4ll_cb_t)(sd_ipv4ll *ll, int event, void *userdata);
+
+int sd_ipv4ll_detach_event(sd_ipv4ll *ll);
+int sd_ipv4ll_attach_event(sd_ipv4ll *ll, sd_event *event, int priority);
+int sd_ipv4ll_get_address(sd_ipv4ll *ll, struct in_addr *address);
+int sd_ipv4ll_set_callback(sd_ipv4ll *ll, sd_ipv4ll_cb_t cb, void *userdata);
+int sd_ipv4ll_set_mac(sd_ipv4ll *ll, const struct ether_addr *addr);
+int sd_ipv4ll_set_index(sd_ipv4ll *ll, int interface_index);
+int sd_ipv4ll_start (sd_ipv4ll *ll);
+int sd_ipv4ll_stop (sd_ipv4ll *ll);
+void sd_ipv4ll_free (sd_ipv4ll *ll);
+int sd_ipv4ll_new (sd_ipv4ll **ret);
+
+#endif