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authorLinus Luessing <linus.luessing@web.de>2016-01-16 16:40:09 +0800
committerAntonio Quartulli <a@unstable.cc>2016-02-29 16:05:29 +0800
commitd6f94d91f766b4205e5b0aa4b11f96271c793f6d (patch)
tree8055ce7a0337ab262af4522f9a20ab11b4769239 /net/batman-adv/bat_v.c
parent0744ff8fa8fad7aae669b73fd78f3efe1d8e31ca (diff)
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batman-adv: ELP - adding basic infrastructure
The B.A.T.M.A.N. protocol originally only used a single message type (called OGM) to determine the link qualities to the direct neighbors and spreading these link quality information through the whole mesh. This procedure is summarized on the BATMAN concept page and explained in details in the RFC draft published in 2008. This approach was chosen for its simplicity during the protocol design phase and the implementation. However, it also bears some drawbacks: * Wireless interfaces usually come with some packet loss, therefore a higher broadcast rate is desirable to allow a fast reaction on flaky connections. Other interfaces of the same host might be connected to Ethernet LANs / VPNs / etc which rarely exhibit packet loss would benefit from a lower broadcast rate to reduce overhead. * It generally is more desirable to detect local link quality changes at a faster rate than propagating all these changes through the entire mesh (the far end of the mesh does not need to care about local link quality changes that much). Other optimizations strategies, like reducing overhead, might be possible if OGMs weren't used for all tasks in the mesh at the same time. As a result detecting local link qualities shall be handled by an independent message type, ELP, whereas the OGM message type remains responsible for flooding the mesh with these link quality information and determining the overall path transmit qualities. Developed by Linus during a 6 months trainee study period in Ascom (Switzerland) AG. Signed-off-by: Linus Luessing <linus.luessing@web.de> Signed-off-by: Marek Lindner <mareklindner@neomailbox.ch> Signed-off-by: Antonio Quartulli <antonio@open-mesh.com>
Diffstat (limited to 'net/batman-adv/bat_v.c')
-rw-r--r--net/batman-adv/bat_v.c74
1 files changed, 74 insertions, 0 deletions
diff --git a/net/batman-adv/bat_v.c b/net/batman-adv/bat_v.c
new file mode 100644
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+++ b/net/batman-adv/bat_v.c
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+/* Copyright (C) 2013-2016 B.A.T.M.A.N. contributors:
+ *
+ * Linus Lüssing, Marek Lindner
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of version 2 of the GNU General Public
+ * License as published by the Free Software Foundation.
+ *
+ * This program 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
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include "bat_algo.h"
+#include "main.h"
+
+#include <linux/cache.h>
+#include <linux/init.h>
+
+#include "bat_v_elp.h"
+
+static int batadv_v_iface_enable(struct batadv_hard_iface *hard_iface)
+{
+ return batadv_v_elp_iface_enable(hard_iface);
+}
+
+static void batadv_v_iface_disable(struct batadv_hard_iface *hard_iface)
+{
+ batadv_v_elp_iface_disable(hard_iface);
+}
+
+static void batadv_v_iface_update_mac(struct batadv_hard_iface *hard_iface)
+{
+}
+
+static void batadv_v_primary_iface_set(struct batadv_hard_iface *hard_iface)
+{
+ batadv_v_elp_primary_iface_set(hard_iface);
+}
+
+static void batadv_v_ogm_schedule(struct batadv_hard_iface *hard_iface)
+{
+}
+
+static void batadv_v_ogm_emit(struct batadv_forw_packet *forw_packet)
+{
+}
+
+static struct batadv_algo_ops batadv_batman_v __read_mostly = {
+ .name = "BATMAN_V",
+ .bat_iface_enable = batadv_v_iface_enable,
+ .bat_iface_disable = batadv_v_iface_disable,
+ .bat_iface_update_mac = batadv_v_iface_update_mac,
+ .bat_primary_iface_set = batadv_v_primary_iface_set,
+ .bat_ogm_emit = batadv_v_ogm_emit,
+ .bat_ogm_schedule = batadv_v_ogm_schedule,
+};
+
+/**
+ * batadv_v_init - B.A.T.M.A.N. V initialization function
+ *
+ * Description: Takes care of initializing all the subcomponents.
+ * It is invoked upon module load only.
+ *
+ * Return: 0 on success or a negative error code otherwise
+ */
+int __init batadv_v_init(void)
+{
+ return batadv_algo_register(&batadv_batman_v);
+}