Merge tag 'batadv-next-for-davem-20160704' of git://git.open-mesh.org/linux-merge

Simon Wunderlich says:

====================
This feature patchset includes the following changes:

 - Cleanup work by Markus Pargmann and Sven Eckelmann (six patches)

 - Initial Netlink support by Matthias Schiffer (two patches)

 - Throughput Meter implementation by Antonio Quartulli, a kernel-space
   traffic generator to estimate link speeds. This feature is useful on
   low-end WiFi APs where running iperf or netperf from userspace
   gives wrong results due to heavy userspace/kernelspace overhead.
   (two patches)

 - API clean-up work by Antonio Quartulli (one patch)
====================
Signed-off-by: David S. Miller <davem@davemloft.net>

MAINTAINERS

@@ -2297,6 +2297,7 @@ S:	Maintained
 F:	Documentation/ABI/testing/sysfs-class-net-batman-adv
 F:	Documentation/ABI/testing/sysfs-class-net-mesh
 F:	Documentation/networking/batman-adv.txt
+F:	include/uapi/linux/batman_adv.h
 F:	net/batman-adv/
 
 BAYCOM/HDLCDRV DRIVERS FOR AX.25

include/uapi/linux/batman_adv.h

+/* Copyright (C) 2016 B.A.T.M.A.N. contributors:
+ *
+ * Matthias Schiffer
+ *
+ * Permission to use, copy, modify, and/or distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ */
+
+#ifndef _UAPI_LINUX_BATMAN_ADV_H_
+#define _UAPI_LINUX_BATMAN_ADV_H_
+
+#define BATADV_NL_NAME "batadv"
+
+#define BATADV_NL_MCAST_GROUP_TPMETER	"tpmeter"
+
+/**
+ * enum batadv_nl_attrs - batman-adv netlink attributes
+ *
+ * @BATADV_ATTR_UNSPEC: unspecified attribute to catch errors
+ * @BATADV_ATTR_VERSION: batman-adv version string
+ * @BATADV_ATTR_ALGO_NAME: name of routing algorithm
+ * @BATADV_ATTR_MESH_IFINDEX: index of the batman-adv interface
+ * @BATADV_ATTR_MESH_IFNAME: name of the batman-adv interface
+ * @BATADV_ATTR_MESH_ADDRESS: mac address of the batman-adv interface
+ * @BATADV_ATTR_HARD_IFINDEX: index of the non-batman-adv interface
+ * @BATADV_ATTR_HARD_IFNAME: name of the non-batman-adv interface
+ * @BATADV_ATTR_HARD_ADDRESS: mac address of the non-batman-adv interface
+ * @BATADV_ATTR_ORIG_ADDRESS: originator mac address
+ * @BATADV_ATTR_TPMETER_RESULT: result of run (see batadv_tp_meter_status)
+ * @BATADV_ATTR_TPMETER_TEST_TIME: time (msec) the run took
+ * @BATADV_ATTR_TPMETER_BYTES: amount of acked bytes during run
+ * @BATADV_ATTR_TPMETER_COOKIE: session cookie to match tp_meter session
+ * @BATADV_ATTR_PAD: attribute used for padding for 64-bit alignment
+ * @__BATADV_ATTR_AFTER_LAST: internal use
+ * @NUM_BATADV_ATTR: total number of batadv_nl_attrs available
+ * @BATADV_ATTR_MAX: highest attribute number currently defined
+ */
+enum batadv_nl_attrs {
+	BATADV_ATTR_UNSPEC,
+	BATADV_ATTR_VERSION,
+	BATADV_ATTR_ALGO_NAME,
+	BATADV_ATTR_MESH_IFINDEX,
+	BATADV_ATTR_MESH_IFNAME,
+	BATADV_ATTR_MESH_ADDRESS,
+	BATADV_ATTR_HARD_IFINDEX,
+	BATADV_ATTR_HARD_IFNAME,
+	BATADV_ATTR_HARD_ADDRESS,
+	BATADV_ATTR_ORIG_ADDRESS,
+	BATADV_ATTR_TPMETER_RESULT,
+	BATADV_ATTR_TPMETER_TEST_TIME,
+	BATADV_ATTR_TPMETER_BYTES,
+	BATADV_ATTR_TPMETER_COOKIE,
+	BATADV_ATTR_PAD,
+	/* add attributes above here, update the policy in netlink.c */
+	__BATADV_ATTR_AFTER_LAST,
+	NUM_BATADV_ATTR = __BATADV_ATTR_AFTER_LAST,
+	BATADV_ATTR_MAX = __BATADV_ATTR_AFTER_LAST - 1
+};
+
+/**
+ * enum batadv_nl_commands - supported batman-adv netlink commands
+ *
+ * @BATADV_CMD_UNSPEC: unspecified command to catch errors
+ * @BATADV_CMD_GET_MESH_INFO: Query basic information about batman-adv device
+ * @BATADV_CMD_TP_METER: Start a tp meter session
+ * @BATADV_CMD_TP_METER_CANCEL: Cancel a tp meter session
+ * @__BATADV_CMD_AFTER_LAST: internal use
+ * @BATADV_CMD_MAX: highest used command number
+ */
+enum batadv_nl_commands {
+	BATADV_CMD_UNSPEC,
+	BATADV_CMD_GET_MESH_INFO,
+	BATADV_CMD_TP_METER,
+	BATADV_CMD_TP_METER_CANCEL,
+	/* add new commands above here */
+	__BATADV_CMD_AFTER_LAST,
+	BATADV_CMD_MAX = __BATADV_CMD_AFTER_LAST - 1
+};
+
+/**
+ * enum batadv_tp_meter_reason - reason of a tp meter test run stop
+ * @BATADV_TP_REASON_COMPLETE: sender finished tp run
+ * @BATADV_TP_REASON_CANCEL: sender was stopped during run
+ * @BATADV_TP_REASON_DST_UNREACHABLE: receiver could not be reached or didn't
+ *  answer
+ * @BATADV_TP_REASON_RESEND_LIMIT: (unused) sender retry reached limit
+ * @BATADV_TP_REASON_ALREADY_ONGOING: test to or from the same node already
+ *  ongoing
+ * @BATADV_TP_REASON_MEMORY_ERROR: test was stopped due to low memory
+ * @BATADV_TP_REASON_CANT_SEND: failed to send via outgoing interface
+ * @BATADV_TP_REASON_TOO_MANY: too many ongoing sessions
+ */
+enum batadv_tp_meter_reason {
+	BATADV_TP_REASON_COMPLETE		= 3,
+	BATADV_TP_REASON_CANCEL			= 4,
+	/* error status >= 128 */
+	BATADV_TP_REASON_DST_UNREACHABLE	= 128,
+	BATADV_TP_REASON_RESEND_LIMIT		= 129,
+	BATADV_TP_REASON_ALREADY_ONGOING	= 130,
+	BATADV_TP_REASON_MEMORY_ERROR		= 131,
+	BATADV_TP_REASON_CANT_SEND		= 132,
+	BATADV_TP_REASON_TOO_MANY		= 133,
+};
+
+#endif /* _UAPI_LINUX_BATMAN_ADV_H_ */

net/batman-adv/Makefile

@@ -17,6 +17,7 @@
 #
 
 obj-$(CONFIG_BATMAN_ADV) += batman-adv.o
+batman-adv-y += bat_algo.o
 batman-adv-y += bat_iv_ogm.o
 batman-adv-$(CONFIG_BATMAN_ADV_BATMAN_V) += bat_v.o
 batman-adv-$(CONFIG_BATMAN_ADV_BATMAN_V) += bat_v_elp.o
@@ -31,12 +32,16 @@ batman-adv-y += gateway_common.o
 batman-adv-y += hard-interface.o
 batman-adv-y += hash.o
 batman-adv-y += icmp_socket.o
+batman-adv-$(CONFIG_BATMAN_ADV_DEBUG) += log.o
 batman-adv-y += main.o
 batman-adv-$(CONFIG_BATMAN_ADV_MCAST) += multicast.o
+batman-adv-y += netlink.o
 batman-adv-$(CONFIG_BATMAN_ADV_NC) += network-coding.o
 batman-adv-y += originator.o
 batman-adv-y += routing.o
 batman-adv-y += send.o
 batman-adv-y += soft-interface.o
 batman-adv-y += sysfs.o
+batman-adv-y += tp_meter.o
 batman-adv-y += translation-table.o
+batman-adv-y += tvlv.o

net/batman-adv/bat_algo.c

+/* Copyright (C) 2007-2016  B.A.T.M.A.N. contributors:
+ *
+ * Marek Lindner, Simon Wunderlich
+ *
+ * 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 "main.h"
+
+#include <linux/errno.h>
+#include <linux/list.h>
+#include <linux/moduleparam.h>
+#include <linux/printk.h>
+#include <linux/seq_file.h>
+#include <linux/stddef.h>
+#include <linux/string.h>
+
+#include "bat_algo.h"
+
+char batadv_routing_algo[20] = "BATMAN_IV";
+static struct hlist_head batadv_algo_list;
+
+/**
+ * batadv_algo_init - Initialize batman-adv algorithm management data structures
+ */
+void batadv_algo_init(void)
+{
+	INIT_HLIST_HEAD(&batadv_algo_list);
+}
+
+static struct batadv_algo_ops *batadv_algo_get(char *name)
+{
+	struct batadv_algo_ops *bat_algo_ops = NULL, *bat_algo_ops_tmp;
+
+	hlist_for_each_entry(bat_algo_ops_tmp, &batadv_algo_list, list) {
+		if (strcmp(bat_algo_ops_tmp->name, name) != 0)
+			continue;
+
+		bat_algo_ops = bat_algo_ops_tmp;
+		break;
+	}
+
+	return bat_algo_ops;
+}
+
+int batadv_algo_register(struct batadv_algo_ops *bat_algo_ops)
+{
+	struct batadv_algo_ops *bat_algo_ops_tmp;
+
+	bat_algo_ops_tmp = batadv_algo_get(bat_algo_ops->name);
+	if (bat_algo_ops_tmp) {
+		pr_info("Trying to register already registered routing algorithm: %s\n",
+			bat_algo_ops->name);
+		return -EEXIST;
+	}
+
+	/* all algorithms must implement all ops (for now) */
+	if (!bat_algo_ops->iface.enable ||
+	    !bat_algo_ops->iface.disable ||
+	    !bat_algo_ops->iface.update_mac ||
+	    !bat_algo_ops->iface.primary_set ||
+	    !bat_algo_ops->neigh.cmp ||
+	    !bat_algo_ops->neigh.is_similar_or_better) {
+		pr_info("Routing algo '%s' does not implement required ops\n",
+			bat_algo_ops->name);
+		return -EINVAL;
+	}
+
+	INIT_HLIST_NODE(&bat_algo_ops->list);
+	hlist_add_head(&bat_algo_ops->list, &batadv_algo_list);
+
+	return 0;
+}
+
+int batadv_algo_select(struct batadv_priv *bat_priv, char *name)
+{
+	struct batadv_algo_ops *bat_algo_ops;
+
+	bat_algo_ops = batadv_algo_get(name);
+	if (!bat_algo_ops)
+		return -EINVAL;
+
+	bat_priv->algo_ops = bat_algo_ops;
+
+	return 0;
+}
+
+int batadv_algo_seq_print_text(struct seq_file *seq, void *offset)
+{
+	struct batadv_algo_ops *bat_algo_ops;
+
+	seq_puts(seq, "Available routing algorithms:\n");
+
+	hlist_for_each_entry(bat_algo_ops, &batadv_algo_list, list) {
+		seq_printf(seq, " * %s\n", bat_algo_ops->name);
+	}
+
+	return 0;
+}
+
+static int batadv_param_set_ra(const char *val, const struct kernel_param *kp)
+{
+	struct batadv_algo_ops *bat_algo_ops;
+	char *algo_name = (char *)val;
+	size_t name_len = strlen(algo_name);
+
+	if (name_len > 0 && algo_name[name_len - 1] == '\n')
+		algo_name[name_len - 1] = '\0';
+
+	bat_algo_ops = batadv_algo_get(algo_name);
+	if (!bat_algo_ops) {
+		pr_err("Routing algorithm '%s' is not supported\n", algo_name);
+		return -EINVAL;
+	}
+
+	return param_set_copystring(algo_name, kp);
+}
+
+static const struct kernel_param_ops batadv_param_ops_ra = {
+	.set = batadv_param_set_ra,
+	.get = param_get_string,
+};
+
+static struct kparam_string batadv_param_string_ra = {
+	.maxlen = sizeof(batadv_routing_algo),
+	.string = batadv_routing_algo,
+};
+
+module_param_cb(routing_algo, &batadv_param_ops_ra, &batadv_param_string_ra,
+		0644);

net/batman-adv/bat_algo.h

@@ -20,35 +20,16 @@
 
 #include "main.h"
 
-int batadv_iv_init(void);
+#include <linux/types.h>
 
-#ifdef CONFIG_BATMAN_ADV_BATMAN_V
+struct seq_file;
 
-int batadv_v_init(void);
-void batadv_v_hardif_init(struct batadv_hard_iface *hardif);
-int batadv_v_mesh_init(struct batadv_priv *bat_priv);
-void batadv_v_mesh_free(struct batadv_priv *bat_priv);
+extern char batadv_routing_algo[];
+extern struct list_head batadv_hardif_list;
 
-#else
-
-static inline int batadv_v_init(void)
-{
-	return 0;
-}
-
-static inline void batadv_v_hardif_init(struct batadv_hard_iface *hardif)
-{
-}
-
-static inline int batadv_v_mesh_init(struct batadv_priv *bat_priv)
-{
-	return 0;
-}
-
-static inline void batadv_v_mesh_free(struct batadv_priv *bat_priv)
-{
-}
-
-#endif /* CONFIG_BATMAN_ADV_BATMAN_V */
+void batadv_algo_init(void);
+int batadv_algo_register(struct batadv_algo_ops *bat_algo_ops);
+int batadv_algo_select(struct batadv_priv *bat_priv, char *name);
+int batadv_algo_seq_print_text(struct seq_file *seq, void *offset);
 
 #endif /* _NET_BATMAN_ADV_BAT_ALGO_H_ */

net/batman-adv/bat_iv_ogm.c

@@ -15,7 +15,7 @@
  * along with this program; if not, see <http://www.gnu.org/licenses/>.
  */
 
-#include "bat_algo.h"
+#include "bat_iv_ogm.h"
 #include "main.h"
 
 #include <linux/atomic.h>
@@ -31,8 +31,8 @@
 #include <linux/init.h>
 #include <linux/jiffies.h>
 #include <linux/kernel.h>
-#include <linux/list.h>
 #include <linux/kref.h>
+#include <linux/list.h>
 #include <linux/lockdep.h>
 #include <linux/netdevice.h>
 #include <linux/pkt_sched.h>
@@ -49,15 +49,18 @@
 #include <linux/types.h>
 #include <linux/workqueue.h>
 
+#include "bat_algo.h"
 #include "bitarray.h"
 #include "hard-interface.h"
 #include "hash.h"
+#include "log.h"
 #include "network-coding.h"
 #include "originator.h"
 #include "packet.h"
 #include "routing.h"
 #include "send.h"
 #include "translation-table.h"
+#include "tvlv.h"
 
 static void batadv_iv_send_outstanding_bat_ogm_packet(struct work_struct *work);
 
@@ -1850,8 +1853,7 @@ static int batadv_iv_ogm_receive(struct sk_buff *skb,
 	/* did we receive a B.A.T.M.A.N. IV OGM packet on an interface
 	 * that does not have B.A.T.M.A.N. IV enabled ?
 	 */
-	if (bat_priv->bat_algo_ops->bat_iface_enable !=
-	    batadv_iv_ogm_iface_enable)
+	if (bat_priv->algo_ops->iface.enable != batadv_iv_ogm_iface_enable)
 		return NET_RX_DROP;
 
 	batadv_inc_counter(bat_priv, BATADV_CNT_MGMT_RX);
@@ -2117,18 +2119,24 @@ static void batadv_iv_iface_activate(struct batadv_hard_iface *hard_iface)
 
 static struct batadv_algo_ops batadv_batman_iv __read_mostly = {
 	.name = "BATMAN_IV",
-	.bat_iface_activate = batadv_iv_iface_activate,
-	.bat_iface_enable = batadv_iv_ogm_iface_enable,
-	.bat_iface_disable = batadv_iv_ogm_iface_disable,
-	.bat_iface_update_mac = batadv_iv_ogm_iface_update_mac,
-	.bat_primary_iface_set = batadv_iv_ogm_primary_iface_set,
-	.bat_neigh_cmp = batadv_iv_ogm_neigh_cmp,
-	.bat_neigh_is_similar_or_better = batadv_iv_ogm_neigh_is_sob,
-	.bat_neigh_print = batadv_iv_neigh_print,
-	.bat_orig_print = batadv_iv_ogm_orig_print,
-	.bat_orig_free = batadv_iv_ogm_orig_free,
-	.bat_orig_add_if = batadv_iv_ogm_orig_add_if,
-	.bat_orig_del_if = batadv_iv_ogm_orig_del_if,
+	.iface = {
+		.activate = batadv_iv_iface_activate,
+		.enable = batadv_iv_ogm_iface_enable,
+		.disable = batadv_iv_ogm_iface_disable,
+		.update_mac = batadv_iv_ogm_iface_update_mac,
+		.primary_set = batadv_iv_ogm_primary_iface_set,
+	},
+	.neigh = {
+		.cmp = batadv_iv_ogm_neigh_cmp,
+		.is_similar_or_better = batadv_iv_ogm_neigh_is_sob,
+		.print = batadv_iv_neigh_print,
+	},
+	.orig = {
+		.print = batadv_iv_ogm_orig_print,
+		.free = batadv_iv_ogm_orig_free,
+		.add_if = batadv_iv_ogm_orig_add_if,
+		.del_if = batadv_iv_ogm_orig_del_if,
+	},
 };
 
 int __init batadv_iv_init(void)

net/batman-adv/bat_iv_ogm.h

+/* Copyright (C) 2007-2016  B.A.T.M.A.N. contributors:
+ *
+ * Marek Lindner, Simon Wunderlich
+ *
+ * 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/>.
+ */
+
+#ifndef _BATMAN_ADV_BATADV_IV_OGM_H_
+#define _BATMAN_ADV_BATADV_IV_OGM_H_
+
+#include "main.h"
+
+int batadv_iv_init(void);
+
+#endif /* _BATMAN_ADV_BATADV_IV_OGM_H_ */

net/batman-adv/bat_v.c

@@ -15,7 +15,7 @@
  * along with this program; if not, see <http://www.gnu.org/licenses/>.
  */
 
-#include "bat_algo.h"
+#include "bat_v.h"
 #include "main.h"
 
 #include <linux/atomic.h>
@@ -31,6 +31,7 @@
 #include <linux/types.h>
 #include <linux/workqueue.h>
 
+#include "bat_algo.h"
 #include "bat_v_elp.h"
 #include "bat_v_ogm.h"
 #include "hard-interface.h"
@@ -321,16 +322,22 @@ static bool batadv_v_neigh_is_sob(struct batadv_neigh_node *neigh1,
 
 static struct batadv_algo_ops batadv_batman_v __read_mostly = {
 	.name = "BATMAN_V",
-	.bat_iface_activate = batadv_v_iface_activate,
-	.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_hardif_neigh_init = batadv_v_hardif_neigh_init,
-	.bat_orig_print = batadv_v_orig_print,
-	.bat_neigh_cmp = batadv_v_neigh_cmp,
-	.bat_neigh_is_similar_or_better = batadv_v_neigh_is_sob,
-	.bat_neigh_print = batadv_v_neigh_print,
+	.iface = {
+		.activate = batadv_v_iface_activate,
+		.enable = batadv_v_iface_enable,
+		.disable = batadv_v_iface_disable,
+		.update_mac = batadv_v_iface_update_mac,
+		.primary_set = batadv_v_primary_iface_set,
+	},
+	.neigh = {
+		.hardif_init = batadv_v_hardif_neigh_init,
+		.cmp = batadv_v_neigh_cmp,
+		.is_similar_or_better = batadv_v_neigh_is_sob,
+		.print = batadv_v_neigh_print,
+	},
+	.orig = {
+		.print = batadv_v_orig_print,
+	},
 };
 
 /**

net/batman-adv/bat_v.h

+/* Copyright (C) 2011-2016  B.A.T.M.A.N. contributors:
+ *
+ * Marek Lindner, Linus Lüssing
+ *
+ * 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/>.
+ */
+
+#ifndef _NET_BATMAN_ADV_BAT_V_H_
+#define _NET_BATMAN_ADV_BAT_V_H_
+
+#include "main.h"
+
+#ifdef CONFIG_BATMAN_ADV_BATMAN_V
+
+int batadv_v_init(void);
+void batadv_v_hardif_init(struct batadv_hard_iface *hardif);
+int batadv_v_mesh_init(struct batadv_priv *bat_priv);
+void batadv_v_mesh_free(struct batadv_priv *bat_priv);
+
+#else
+
+static inline int batadv_v_init(void)
+{
+	return 0;
+}
+
+static inline void batadv_v_hardif_init(struct batadv_hard_iface *hardif)
+{
+}
+
+static inline int batadv_v_mesh_init(struct batadv_priv *bat_priv)
+{
+	return 0;
+}
+
+static inline void batadv_v_mesh_free(struct batadv_priv *bat_priv)
+{
+}
+
+#endif /* CONFIG_BATMAN_ADV_BATMAN_V */
+
+#endif /* _NET_BATMAN_ADV_BAT_V_H_ */

net/batman-adv/bat_v_elp.c

@@ -43,6 +43,7 @@
 #include "bat_algo.h"
 #include "bat_v_ogm.h"
 #include "hard-interface.h"
+#include "log.h"
 #include "originator.h"
 #include "packet.h"
 #include "routing.h"
@@ -503,7 +504,7 @@ int batadv_v_elp_packet_recv(struct sk_buff *skb,
 	/* did we receive a B.A.T.M.A.N. V ELP packet on an interface
 	 * that does not have B.A.T.M.A.N. V ELP enabled ?
 	 */
-	if (strcmp(bat_priv->bat_algo_ops->name, "BATMAN_V") != 0)
+	if (strcmp(bat_priv->algo_ops->name, "BATMAN_V") != 0)
 		return NET_RX_DROP;
 
 	elp_packet = (struct batadv_elp_packet *)skb->data;

net/batman-adv/bat_v_elp.h

@@ -15,11 +15,11 @@
  * along with this program; if not, see <http://www.gnu.org/licenses/>.
  */
 
-#include "main.h"
-
 #ifndef _NET_BATMAN_ADV_BAT_V_ELP_H_
 #define _NET_BATMAN_ADV_BAT_V_ELP_H_
 
+#include "main.h"
+
 struct sk_buff;
 struct work_struct;
 

net/batman-adv/bat_v_ogm.c

@@ -39,13 +39,16 @@
 #include <linux/types.h>
 #include <linux/workqueue.h>
 
+#include "bat_algo.h"
 #include "hard-interface.h"
 #include "hash.h"
+#include "log.h"
 #include "originator.h"
 #include "packet.h"
 #include "routing.h"
 #include "send.h"
 #include "translation-table.h"
+#include "tvlv.h"
 
 /**
  * batadv_v_ogm_orig_get - retrieve and possibly create an originator node
@@ -751,7 +754,7 @@ int batadv_v_ogm_packet_recv(struct sk_buff *skb,
 	/* did we receive a OGM2 packet on an interface that does not have
 	 * B.A.T.M.A.N. V enabled ?
 	 */
-	if (strcmp(bat_priv->bat_algo_ops->name, "BATMAN_V") != 0)
+	if (strcmp(bat_priv->algo_ops->name, "BATMAN_V") != 0)
 		return NET_RX_DROP;
 
 	if (!batadv_check_management_packet(skb, if_incoming, BATADV_OGM2_HLEN))

net/batman-adv/bat_v_ogm.h

@@ -18,10 +18,10 @@
 #ifndef _BATMAN_ADV_BATADV_V_OGM_H_
 #define _BATMAN_ADV_BATADV_V_OGM_H_
 
+#include "main.h"
+
 #include <linux/types.h>
 
-struct batadv_hard_iface;
-struct batadv_priv;
 struct sk_buff;
 
 int batadv_v_ogm_init(struct batadv_priv *bat_priv);

net/batman-adv/bitarray.c

@@ -20,6 +20,8 @@
 
 #include <linux/bitmap.h>
 
+#include "log.h"
+
 /* shift the packet array by n places. */
 static void batadv_bitmap_shift_left(unsigned long *seq_bits, s32 n)
 {

net/batman-adv/bridge_loop_avoidance.c

@@ -48,6 +48,7 @@
 
 #include "hard-interface.h"
 #include "hash.h"
+#include "log.h"
 #include "originator.h"
 #include "packet.h"
 #include "sysfs.h"

net/batman-adv/debugfs.c

@@ -18,36 +18,26 @@
 #include "debugfs.h"
 #include "main.h"
 
-#include <linux/compiler.h>
 #include <linux/debugfs.h>
 #include <linux/device.h>
 #include <linux/errno.h>
 #include <linux/export.h>
-#include <linux/fcntl.h>
 #include <linux/fs.h>
-#include <linux/jiffies.h>
-#include <linux/kernel.h>
-#include <linux/module.h>
 #include <linux/netdevice.h>
-#include <linux/poll.h>
 #include <linux/printk.h>
 #include <linux/sched.h> /* for linux/wait.h */
 #include <linux/seq_file.h>
-#include <linux/slab.h>
-#include <linux/spinlock.h>
 #include <linux/stat.h>
 #include <linux/stddef.h>
 #include <linux/stringify.h>
 #include <linux/sysfs.h>
-#include <linux/types.h>
-#include <linux/uaccess.h>
-#include <linux/wait.h>
-#include <stdarg.h>
 
+#include "bat_algo.h"
 #include "bridge_loop_avoidance.h"
 #include "distributed-arp-table.h"
 #include "gateway_client.h"
 #include "icmp_socket.h"
+#include "log.h"
 #include "multicast.h"
 #include "network-coding.h"
 #include "originator.h"
@@ -55,209 +45,6 @@
 
 static struct dentry *batadv_debugfs;
 
-#ifdef CONFIG_BATMAN_ADV_DEBUG
-#define BATADV_LOG_BUFF_MASK (batadv_log_buff_len - 1)
-
-static const int batadv_log_buff_len = BATADV_LOG_BUF_LEN;
-
-static char *batadv_log_char_addr(struct batadv_priv_debug_log *debug_log,
-				  size_t idx)
-{
-	return &debug_log->log_buff[idx & BATADV_LOG_BUFF_MASK];
-}
-
-static void batadv_emit_log_char(struct batadv_priv_debug_log *debug_log,
-				 char c)
-{
-	char *char_addr;
-
-	char_addr = batadv_log_char_addr(debug_log, debug_log->log_end);
-	*char_addr = c;
-	debug_log->log_end++;
-
-	if (debug_log->log_end - debug_log->log_start > batadv_log_buff_len)
-		debug_log->log_start = debug_log->log_end - batadv_log_buff_len;
-}
-
-__printf(2, 3)
-static int batadv_fdebug_log(struct batadv_priv_debug_log *debug_log,
-			     const char *fmt, ...)
-{
-	va_list args;
-	static char debug_log_buf[256];
-	char *p;
-
-	if (!debug_log)
-		return 0;
-
-	spin_lock_bh(&debug_log->lock);
-	va_start(args, fmt);
-	vscnprintf(debug_log_buf, sizeof(debug_log_buf), fmt, args);
-	va_end(args);
-
-	for (p = debug_log_buf; *p != 0; p++)
-		batadv_emit_log_char(debug_log, *p);
-
-	spin_unlock_bh(&debug_log->lock);
-
-	wake_up(&debug_log->queue_wait);
-
-	return 0;
-}
-
-int batadv_debug_log(struct batadv_priv *bat_priv, const char *fmt, ...)
-{
-	va_list args;
-	char tmp_log_buf[256];
-
-	va_start(args, fmt);
-	vscnprintf(tmp_log_buf, sizeof(tmp_log_buf), fmt, args);
-	batadv_fdebug_log(bat_priv->debug_log, "[%10u] %s",
-			  jiffies_to_msecs(jiffies), tmp_log_buf);
-	va_end(args);
-
-	return 0;
-}
-
-static int batadv_log_open(struct inode *inode, struct file *file)
-{
-	if (!try_module_get(THIS_MODULE))
-		return -EBUSY;
-
-	nonseekable_open(inode, file);
-	file->private_data = inode->i_private;
-	return 0;
-}
-
-static int batadv_log_release(struct inode *inode, struct file *file)
-{
-	module_put(THIS_MODULE);
-	return 0;
-}
-
-static bool batadv_log_empty(struct batadv_priv_debug_log *debug_log)
-{
-	return !(debug_log->log_start - debug_log->log_end);
-}
-
-static ssize_t batadv_log_read(struct file *file, char __user *buf,
-			       size_t count, loff_t *ppos)
-{
-	struct batadv_priv *bat_priv = file->private_data;
-	struct batadv_priv_debug_log *debug_log = bat_priv->debug_log;
-	int error, i = 0;
-	char *char_addr;
-	char c;
-
-	if ((file->f_flags & O_NONBLOCK) && batadv_log_empty(debug_log))
-		return -EAGAIN;
-
-	if (!buf)
-		return -EINVAL;
-
-	if (count == 0)
-		return 0;
-
-	if (!access_ok(VERIFY_WRITE, buf, count))
-		return -EFAULT;
-
-	error = wait_event_interruptible(debug_log->queue_wait,
-					 (!batadv_log_empty(debug_log)));
-
-	if (error)
-		return error;
-
-	spin_lock_bh(&debug_log->lock);
-
-	while ((!error) && (i < count) &&
-	       (debug_log->log_start != debug_log->log_end)) {
-		char_addr = batadv_log_char_addr(debug_log,
-						 debug_log->log_start);
-		c = *char_addr;
-
-		debug_log->log_start++;
-
-		spin_unlock_bh(&debug_log->lock);
-
-		error = __put_user(c, buf);
-
-		spin_lock_bh(&debug_log->lock);
-
-		buf++;
-		i++;
-	}
-
-	spin_unlock_bh(&debug_log->lock);
-
-	if (!error)
-		return i;
-
-	return error;
-}
-
-static unsigned int batadv_log_poll(struct file *file, poll_table *wait)
-{
-	struct batadv_priv *bat_priv = file->private_data;
-	struct batadv_priv_debug_log *debug_log = bat_priv->debug_log;
-
-	poll_wait(file, &debug_log->queue_wait, wait);
-
-	if (!batadv_log_empty(debug_log))
-		return POLLIN | POLLRDNORM;
-
-	return 0;
-}
-
-static const struct file_operations batadv_log_fops = {
-	.open           = batadv_log_open,
-	.release        = batadv_log_release,
-	.read           = batadv_log_read,
-	.poll           = batadv_log_poll,
-	.llseek         = no_llseek,
-};
-
-static int batadv_debug_log_setup(struct batadv_priv *bat_priv)
-{
-	struct dentry *d;
-
-	if (!bat_priv->debug_dir)
-		goto err;
-
-	bat_priv->debug_log = kzalloc(sizeof(*bat_priv->debug_log), GFP_ATOMIC);
-	if (!bat_priv->debug_log)
-		goto err;
-
-	spin_lock_init(&bat_priv->debug_log->lock);
-	init_waitqueue_head(&bat_priv->debug_log->queue_wait);
-
-	d = debugfs_create_file("log", S_IFREG | S_IRUSR,
-				bat_priv->debug_dir, bat_priv,
-				&batadv_log_fops);
-	if (!d)
-		goto err;
-
-	return 0;
-
-err:
-	return -ENOMEM;
-}
-
-static void batadv_debug_log_cleanup(struct batadv_priv *bat_priv)
-{
-	kfree(bat_priv->debug_log);
-	bat_priv->debug_log = NULL;
-}
-#else /* CONFIG_BATMAN_ADV_DEBUG */
-static int batadv_debug_log_setup(struct batadv_priv *bat_priv)
-{
-	return 0;
-}
-
-static void batadv_debug_log_cleanup(struct batadv_priv *bat_priv)
-{
-}
-#endif
-
 static int batadv_algorithms_open(struct inode *inode, struct file *file)
 {
 	return single_open(file, batadv_algo_seq_print_text, NULL);

net/batman-adv/distributed-arp-table.c

@@ -45,9 +45,11 @@
 
 #include "hard-interface.h"
 #include "hash.h"
+#include "log.h"
 #include "originator.h"
 #include "send.h"
 #include "translation-table.h"
+#include "tvlv.h"
 
 static void batadv_dat_purge(struct work_struct *work);
 

net/batman-adv/fragmentation.c

@@ -433,11 +433,12 @@ static struct sk_buff *batadv_frag_create(struct sk_buff *skb,
  * @orig_node: final destination of the created fragments
  * @neigh_node: next-hop of the created fragments
  *
- * Return: true on success, false otherwise.
+ * Return: the netdev tx status or -1 in case of error.
+ * When -1 is returned the skb is not consumed.
  */
-bool batadv_frag_send_packet(struct sk_buff *skb,
-			     struct batadv_orig_node *orig_node,
-			     struct batadv_neigh_node *neigh_node)
+int batadv_frag_send_packet(struct sk_buff *skb,
+			    struct batadv_orig_node *orig_node,
+			    struct batadv_neigh_node *neigh_node)
 {
 	struct batadv_priv *bat_priv;
 	struct batadv_hard_iface *primary_if = NULL;
@@ -446,7 +447,7 @@ bool batadv_frag_send_packet(struct sk_buff *skb,
 	unsigned int mtu = neigh_node->if_incoming->net_dev->mtu;
 	unsigned int header_size = sizeof(frag_header);
 	unsigned int max_fragment_size, max_packet_size;
-	bool ret = false;
+	int ret = -1;
 
 	/* To avoid merge and refragmentation at next-hops we never send
 	 * fragments larger than BATADV_FRAG_MAX_FRAG_SIZE
@@ -457,12 +458,12 @@ bool batadv_frag_send_packet(struct sk_buff *skb,
 
 	/* Don't even try to fragment, if we need more than 16 fragments */
 	if (skb->len > max_packet_size)
-		goto out_err;
+		goto out;
 
 	bat_priv = orig_node->bat_priv;
 	primary_if = batadv_primary_if_get_selected(bat_priv);
 	if (!primary_if)
-		goto out_err;
+		goto out;
 
 	/* Create one header to be copied to all fragments */
 	frag_header.packet_type = BATADV_UNICAST_FRAG;
@@ -488,23 +489,33 @@ bool batadv_frag_send_packet(struct sk_buff *skb,
 	while (skb->len > max_fragment_size) {
 		skb_fragment = batadv_frag_create(skb, &frag_header, mtu);
 		if (!skb_fragment)
-			goto out_err;
+			goto out;
 
 		batadv_inc_counter(bat_priv, BATADV_CNT_FRAG_TX);
 		batadv_add_counter(bat_priv, BATADV_CNT_FRAG_TX_BYTES,
 				   skb_fragment->len + ETH_HLEN);
-		batadv_send_unicast_skb(skb_fragment, neigh_node);
+		ret = batadv_send_unicast_skb(skb_fragment, neigh_node);
+		if (ret != NET_XMIT_SUCCESS) {
+			/* return -1 so that the caller can free the original
+			 * skb
+			 */
+			ret = -1;
+			goto out;
+		}
+
 		frag_header.no++;
 
 		/* The initial check in this function should cover this case */
-		if (frag_header.no == BATADV_FRAG_MAX_FRAGMENTS - 1)
-			goto out_err;
+		if (frag_header.no == BATADV_FRAG_MAX_FRAGMENTS - 1) {
+			ret = -1;
+			goto out;
+		}
 	}
 
 	/* Make room for the fragment header. */
 	if (batadv_skb_head_push(skb, header_size) < 0 ||
 	    pskb_expand_head(skb, header_size + ETH_HLEN, 0, GFP_ATOMIC) < 0)
-		goto out_err;
+		goto out;
 
 	memcpy(skb->data, &frag_header, header_size);
 
@@ -512,11 +523,9 @@ bool batadv_frag_send_packet(struct sk_buff *skb,
 	batadv_inc_counter(bat_priv, BATADV_CNT_FRAG_TX);
 	batadv_add_counter(bat_priv, BATADV_CNT_FRAG_TX_BYTES,
 			   skb->len + ETH_HLEN);
-	batadv_send_unicast_skb(skb, neigh_node);
+	ret = batadv_send_unicast_skb(skb, neigh_node);
 
-	ret = true;
-
-out_err:
+out:
 	if (primary_if)
 		batadv_hardif_put(primary_if);
 

net/batman-adv/fragmentation.h

@@ -34,9 +34,9 @@ bool batadv_frag_skb_fwd(struct sk_buff *skb,
 			 struct batadv_orig_node *orig_node_src);
 bool batadv_frag_skb_buffer(struct sk_buff **skb,
 			    struct batadv_orig_node *orig_node);
-bool batadv_frag_send_packet(struct sk_buff *skb,
-			     struct batadv_orig_node *orig_node,
-			     struct batadv_neigh_node *neigh_node);
+int batadv_frag_send_packet(struct sk_buff *skb,
+			    struct batadv_orig_node *orig_node,
+			    struct batadv_neigh_node *neigh_node);
 
 /**
  * batadv_frag_check_entry - check if a list of fragments has timed out

net/batman-adv/gateway_client.c

@@ -42,6 +42,7 @@
 
 #include "gateway_common.h"
 #include "hard-interface.h"
+#include "log.h"
 #include "originator.h"
 #include "packet.h"
 #include "routing.h"

net/batman-adv/gateway_common.c

@@ -19,8 +19,8 @@
 #include "main.h"
 
 #include <linux/atomic.h>
-#include <linux/errno.h>
 #include <linux/byteorder/generic.h>
+#include <linux/errno.h>
 #include <linux/kernel.h>
 #include <linux/math64.h>
 #include <linux/netdevice.h>
@@ -28,7 +28,9 @@
 #include <linux/string.h>
 
 #include "gateway_client.h"
+#include "log.h"
 #include "packet.h"
+#include "tvlv.h"
 
 /**
  * batadv_parse_throughput - parse supplied string buffer to extract throughput

net/batman-adv/hard-interface.c

@@ -23,9 +23,9 @@
 #include <linux/byteorder/generic.h>
 #include <linux/errno.h>
 #include <linux/fs.h>
+#include <linux/if.h>
 #include <linux/if_arp.h>
 #include <linux/if_ether.h>
-#include <linux/if.h>
 #include <linux/kernel.h>
 #include <linux/kref.h>
 #include <linux/list.h>
@@ -37,11 +37,12 @@
 #include <linux/spinlock.h>
 #include <linux/workqueue.h>
 
-#include "bat_algo.h"
+#include "bat_v.h"
 #include "bridge_loop_avoidance.h"
 #include "debugfs.h"
 #include "distributed-arp-table.h"
 #include "gateway_client.h"
+#include "log.h"
 #include "originator.h"
 #include "packet.h"
 #include "send.h"
@@ -246,7 +247,7 @@ static void batadv_primary_if_select(struct batadv_priv *bat_priv,
 	if (!new_hard_iface)
 		goto out;
 
-	bat_priv->bat_algo_ops->bat_primary_iface_set(new_hard_iface);
+	bat_priv->algo_ops->iface.primary_set(new_hard_iface);
 	batadv_primary_if_update_addr(bat_priv, curr_hard_iface);
 
 out:
@@ -393,7 +394,7 @@ batadv_hardif_activate_interface(struct batadv_hard_iface *hard_iface)
 
 	bat_priv = netdev_priv(hard_iface->soft_iface);
 
-	bat_priv->bat_algo_ops->bat_iface_update_mac(hard_iface);
+	bat_priv->algo_ops->iface.update_mac(hard_iface);
 	hard_iface->if_status = BATADV_IF_TO_BE_ACTIVATED;
 
 	/* the first active interface becomes our primary interface or
@@ -408,8 +409,8 @@ batadv_hardif_activate_interface(struct batadv_hard_iface *hard_iface)
 
 	batadv_update_min_mtu(hard_iface->soft_iface);
 
-	if (bat_priv->bat_algo_ops->bat_iface_activate)
-		bat_priv->bat_algo_ops->bat_iface_activate(hard_iface);
+	if (bat_priv->algo_ops->iface.activate)
+		bat_priv->algo_ops->iface.activate(hard_iface);
 
 out:
 	if (primary_if)
@@ -507,7 +508,7 @@ int batadv_hardif_enable_interface(struct batadv_hard_iface *hard_iface,
 	if (ret)
 		goto err_dev;
 
-	ret = bat_priv->bat_algo_ops->bat_iface_enable(hard_iface);
+	ret = bat_priv->algo_ops->iface.enable(hard_iface);
 	if (ret < 0)
 		goto err_upper;
 
@@ -516,7 +517,7 @@ int batadv_hardif_enable_interface(struct batadv_hard_iface *hard_iface,
 	hard_iface->if_status = BATADV_IF_INACTIVE;
 	ret = batadv_orig_hash_add_if(hard_iface, bat_priv->num_ifaces);
 	if (ret < 0) {
-		bat_priv->bat_algo_ops->bat_iface_disable(hard_iface);
+		bat_priv->algo_ops->iface.disable(hard_iface);
 		bat_priv->num_ifaces--;
 		hard_iface->if_status = BATADV_IF_NOT_IN_USE;
 		goto err_upper;
@@ -597,7 +598,7 @@ void batadv_hardif_disable_interface(struct batadv_hard_iface *hard_iface,
 			batadv_hardif_put(new_if);
 	}
 
-	bat_priv->bat_algo_ops->bat_iface_disable(hard_iface);
+	bat_priv->algo_ops->iface.disable(hard_iface);
 	hard_iface->if_status = BATADV_IF_NOT_IN_USE;
 
 	/* delete all references to this hard_iface */
@@ -782,7 +783,7 @@ static int batadv_hard_if_event(struct notifier_block *this,
 		batadv_check_known_mac_addr(hard_iface->net_dev);
 
 		bat_priv = netdev_priv(hard_iface->soft_iface);
-		bat_priv->bat_algo_ops->bat_iface_update_mac(hard_iface);
+		bat_priv->algo_ops->iface.update_mac(hard_iface);
 
 		primary_if = batadv_primary_if_get_selected(bat_priv);
 		if (!primary_if)

net/batman-adv/icmp_socket.c

@@ -45,6 +45,7 @@
 #include <linux/wait.h>
 
 #include "hard-interface.h"
+#include "log.h"
 #include "originator.h"
 #include "packet.h"
 #include "send.h"

net/batman-adv/log.c

+/* Copyright (C) 2010-2016  B.A.T.M.A.N. contributors:
+ *
+ * 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 "log.h"
+#include "main.h"
+
+#include <linux/compiler.h>
+#include <linux/debugfs.h>
+#include <linux/errno.h>
+#include <linux/export.h>
+#include <linux/fcntl.h>
+#include <linux/fs.h>
+#include <linux/jiffies.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/poll.h>
+#include <linux/sched.h> /* for linux/wait.h */
+#include <linux/slab.h>
+#include <linux/spinlock.h>
+#include <linux/stat.h>
+#include <linux/stddef.h>
+#include <linux/types.h>
+#include <linux/uaccess.h>
+#include <linux/wait.h>
+#include <stdarg.h>
+
+#define BATADV_LOG_BUFF_MASK (batadv_log_buff_len - 1)
+
+static const int batadv_log_buff_len = BATADV_LOG_BUF_LEN;
+
+static char *batadv_log_char_addr(struct batadv_priv_debug_log *debug_log,
+				  size_t idx)
+{
+	return &debug_log->log_buff[idx & BATADV_LOG_BUFF_MASK];
+}
+
+static void batadv_emit_log_char(struct batadv_priv_debug_log *debug_log,
+				 char c)
+{
+	char *char_addr;
+
+	char_addr = batadv_log_char_addr(debug_log, debug_log->log_end);
+	*char_addr = c;
+	debug_log->log_end++;
+
+	if (debug_log->log_end - debug_log->log_start > batadv_log_buff_len)
+		debug_log->log_start = debug_log->log_end - batadv_log_buff_len;
+}
+
+__printf(2, 3)
+static int batadv_fdebug_log(struct batadv_priv_debug_log *debug_log,
+			     const char *fmt, ...)
+{
+	va_list args;
+	static char debug_log_buf[256];
+	char *p;
+
+	if (!debug_log)
+		return 0;
+
+	spin_lock_bh(&debug_log->lock);
+	va_start(args, fmt);
+	vscnprintf(debug_log_buf, sizeof(debug_log_buf), fmt, args);
+	va_end(args);
+
+	for (p = debug_log_buf; *p != 0; p++)
+		batadv_emit_log_char(debug_log, *p);
+
+	spin_unlock_bh(&debug_log->lock);
+
+	wake_up(&debug_log->queue_wait);
+
+	return 0;
+}
+
+int batadv_debug_log(struct batadv_priv *bat_priv, const char *fmt, ...)
+{
+	va_list args;
+	char tmp_log_buf[256];
+
+	va_start(args, fmt);
+	vscnprintf(tmp_log_buf, sizeof(tmp_log_buf), fmt, args);
+	batadv_fdebug_log(bat_priv->debug_log, "[%10u] %s",
+			  jiffies_to_msecs(jiffies), tmp_log_buf);
+	va_end(args);
+
+	return 0;
+}
+
+static int batadv_log_open(struct inode *inode, struct file *file)
+{
+	if (!try_module_get(THIS_MODULE))
+		return -EBUSY;
+
+	nonseekable_open(inode, file);
+	file->private_data = inode->i_private;
+	return 0;
+}
+
+static int batadv_log_release(struct inode *inode, struct file *file)
+{
+	module_put(THIS_MODULE);
+	return 0;
+}
+
+static bool batadv_log_empty(struct batadv_priv_debug_log *debug_log)
+{
+	return !(debug_log->log_start - debug_log->log_end);
+}
+
+static ssize_t batadv_log_read(struct file *file, char __user *buf,
+			       size_t count, loff_t *ppos)
+{
+	struct batadv_priv *bat_priv = file->private_data;
+	struct batadv_priv_debug_log *debug_log = bat_priv->debug_log;
+	int error, i = 0;
+	char *char_addr;
+	char c;
+
+	if ((file->f_flags & O_NONBLOCK) && batadv_log_empty(debug_log))
+		return -EAGAIN;
+
+	if (!buf)
+		return -EINVAL;
+
+	if (count == 0)
+		return 0;
+
+	if (!access_ok(VERIFY_WRITE, buf, count))
+		return -EFAULT;
+
+	error = wait_event_interruptible(debug_log->queue_wait,
+					 (!batadv_log_empty(debug_log)));
+
+	if (error)
+		return error;
+
+	spin_lock_bh(&debug_log->lock);
+
+	while ((!error) && (i < count) &&
+	       (debug_log->log_start != debug_log->log_end)) {
+		char_addr = batadv_log_char_addr(debug_log,
+						 debug_log->log_start);
+		c = *char_addr;
+
+		debug_log->log_start++;
+
+		spin_unlock_bh(&debug_log->lock);
+
+		error = __put_user(c, buf);
+
+		spin_lock_bh(&debug_log->lock);
+
+		buf++;
+		i++;
+	}
+
+	spin_unlock_bh(&debug_log->lock);
+
+	if (!error)
+		return i;
+
+	return error;
+}
+
+static unsigned int batadv_log_poll(struct file *file, poll_table *wait)
+{
+	struct batadv_priv *bat_priv = file->private_data;
+	struct batadv_priv_debug_log *debug_log = bat_priv->debug_log;
+
+	poll_wait(file, &debug_log->queue_wait, wait);
+
+	if (!batadv_log_empty(debug_log))
+		return POLLIN | POLLRDNORM;
+
+	return 0;
+}
+
+static const struct file_operations batadv_log_fops = {
+	.open           = batadv_log_open,
+	.release        = batadv_log_release,
+	.read           = batadv_log_read,
+	.poll           = batadv_log_poll,
+	.llseek         = no_llseek,
+};
+
+int batadv_debug_log_setup(struct batadv_priv *bat_priv)
+{
+	struct dentry *d;
+
+	if (!bat_priv->debug_dir)
+		goto err;
+
+	bat_priv->debug_log = kzalloc(sizeof(*bat_priv->debug_log), GFP_ATOMIC);
+	if (!bat_priv->debug_log)
+		goto err;
+
+	spin_lock_init(&bat_priv->debug_log->lock);
+	init_waitqueue_head(&bat_priv->debug_log->queue_wait);
+
+	d = debugfs_create_file("log", S_IFREG | S_IRUSR,
+				bat_priv->debug_dir, bat_priv,
+				&batadv_log_fops);
+	if (!d)
+		goto err;
+
+	return 0;
+
+err:
+	return -ENOMEM;
+}
+
+void batadv_debug_log_cleanup(struct batadv_priv *bat_priv)
+{
+	kfree(bat_priv->debug_log);
+	bat_priv->debug_log = NULL;
+}

net/batman-adv/log.h

+/* Copyright (C) 2007-2016  B.A.T.M.A.N. contributors:
+ *
+ * Marek Lindner, Simon Wunderlich
+ *
+ * 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/>.
+ */
+
+#ifndef _NET_BATMAN_ADV_LOG_H_
+#define _NET_BATMAN_ADV_LOG_H_
+
+#include "main.h"
+
+#include <linux/bitops.h>
+#include <linux/compiler.h>
+#include <linux/printk.h>
+
+#ifdef CONFIG_BATMAN_ADV_DEBUG
+
+int batadv_debug_log_setup(struct batadv_priv *bat_priv);
+void batadv_debug_log_cleanup(struct batadv_priv *bat_priv);
+
+#else
+
+static inline int batadv_debug_log_setup(struct batadv_priv *bat_priv)
+{
+	return 0;
+}
+
+static inline void batadv_debug_log_cleanup(struct batadv_priv *bat_priv)
+{
+}
+
+#endif
+
+/**
+ * enum batadv_dbg_level - available log levels
+ * @BATADV_DBG_BATMAN: OGM and TQ computations related messages
+ * @BATADV_DBG_ROUTES: route added / changed / deleted
+ * @BATADV_DBG_TT: translation table messages
+ * @BATADV_DBG_BLA: bridge loop avoidance messages
+ * @BATADV_DBG_DAT: ARP snooping and DAT related messages
+ * @BATADV_DBG_NC: network coding related messages
+ * @BATADV_DBG_MCAST: multicast related messages
+ * @BATADV_DBG_TP_METER: throughput meter messages
+ * @BATADV_DBG_ALL: the union of all the above log levels
+ */
+enum batadv_dbg_level {
+	BATADV_DBG_BATMAN	= BIT(0),
+	BATADV_DBG_ROUTES	= BIT(1),
+	BATADV_DBG_TT		= BIT(2),
+	BATADV_DBG_BLA		= BIT(3),
+	BATADV_DBG_DAT		= BIT(4),
+	BATADV_DBG_NC		= BIT(5),
+	BATADV_DBG_MCAST	= BIT(6),
+	BATADV_DBG_TP_METER	= BIT(7),
+	BATADV_DBG_ALL		= 127,
+};
+
+#ifdef CONFIG_BATMAN_ADV_DEBUG
+int batadv_debug_log(struct batadv_priv *bat_priv, const char *fmt, ...)
+__printf(2, 3);
+
+/* possibly ratelimited debug output */
+#define _batadv_dbg(type, bat_priv, ratelimited, fmt, arg...)	\
+	do {							\
+		if (atomic_read(&bat_priv->log_level) & type && \
+		    (!ratelimited || net_ratelimit()))		\
+			batadv_debug_log(bat_priv, fmt, ## arg);\
+	}							\
+	while (0)
+#else /* !CONFIG_BATMAN_ADV_DEBUG */
+__printf(4, 5)
+static inline void _batadv_dbg(int type __always_unused,
+			       struct batadv_priv *bat_priv __always_unused,
+			       int ratelimited __always_unused,
+			       const char *fmt __always_unused, ...)
+{
+}
+#endif
+
+#define batadv_dbg(type, bat_priv, arg...) \
+	_batadv_dbg(type, bat_priv, 0, ## arg)
+#define batadv_dbg_ratelimited(type, bat_priv, arg...) \
+	_batadv_dbg(type, bat_priv, 1, ## arg)
+
+#define batadv_info(net_dev, fmt, arg...)				\
+	do {								\
+		struct net_device *_netdev = (net_dev);                 \
+		struct batadv_priv *_batpriv = netdev_priv(_netdev);    \
+		batadv_dbg(BATADV_DBG_ALL, _batpriv, fmt, ## arg);	\
+		pr_info("%s: " fmt, _netdev->name, ## arg);		\
+	} while (0)
+#define batadv_err(net_dev, fmt, arg...)				\
+	do {								\
+		struct net_device *_netdev = (net_dev);                 \
+		struct batadv_priv *_batpriv = netdev_priv(_netdev);    \
+		batadv_dbg(BATADV_DBG_ALL, _batpriv, fmt, ## arg);	\
+		pr_err("%s: " fmt, _netdev->name, ## arg);		\
+	} while (0)
+
+#endif /* _NET_BATMAN_ADV_LOG_H_ */

net/batman-adv/main.c

@@ -31,16 +31,13 @@
 #include <linux/kernel.h>
 #include <linux/kref.h>
 #include <linux/list.h>
-#include <linux/lockdep.h>
 #include <linux/module.h>
-#include <linux/moduleparam.h>
 #include <linux/netdevice.h>
-#include <linux/pkt_sched.h>
+#include <linux/printk.h>
 #include <linux/rculist.h>
 #include <linux/rcupdate.h>
 #include <linux/seq_file.h>
 #include <linux/skbuff.h>
-#include <linux/slab.h>
 #include <linux/spinlock.h>
 #include <linux/stddef.h>
 #include <linux/string.h>
@@ -49,6 +46,8 @@
 #include <net/rtnetlink.h>
 
 #include "bat_algo.h"
+#include "bat_iv_ogm.h"
+#include "bat_v.h"
 #include "bridge_loop_avoidance.h"
 #include "debugfs.h"
 #include "distributed-arp-table.h"
@@ -56,13 +55,16 @@
 #include "gateway_common.h"
 #include "hard-interface.h"
 #include "icmp_socket.h"
+#include "log.h"
 #include "multicast.h"
+#include "netlink.h"
 #include "network-coding.h"
 #include "originator.h"
 #include "packet.h"
 #include "routing.h"
 #include "send.h"
 #include "soft-interface.h"
+#include "tp_meter.h"
 #include "translation-table.h"
 
 /* List manipulations on hardif_list have to be rtnl_lock()'ed,
@@ -71,8 +73,6 @@
 struct list_head batadv_hardif_list;
 static int (*batadv_rx_handler[256])(struct sk_buff *,
 				     struct batadv_hard_iface *);
-char batadv_routing_algo[20] = "BATMAN_IV";
-static struct hlist_head batadv_algo_list;
 
 unsigned char batadv_broadcast_addr[] = {0xff, 0xff, 0xff, 0xff, 0xff, 0xff};
 
@@ -83,13 +83,14 @@ static void batadv_recv_handler_init(void);
 static int __init batadv_init(void)
 {
 	INIT_LIST_HEAD(&batadv_hardif_list);
-	INIT_HLIST_HEAD(&batadv_algo_list);
+	batadv_algo_init();
 
 	batadv_recv_handler_init();
 
 	batadv_v_init();
 	batadv_iv_init();
 	batadv_nc_init();
+	batadv_tp_meter_init();
 
 	batadv_event_workqueue = create_singlethread_workqueue("bat_events");
 
@@ -101,6 +102,7 @@ static int __init batadv_init(void)
 
 	register_netdevice_notifier(&batadv_hard_if_notifier);
 	rtnl_link_register(&batadv_link_ops);
+	batadv_netlink_register();
 
 	pr_info("B.A.T.M.A.N. advanced %s (compatibility version %i) loaded\n",
 		BATADV_SOURCE_VERSION, BATADV_COMPAT_VERSION);
@@ -111,6 +113,7 @@ static int __init batadv_init(void)
 static void __exit batadv_exit(void)
 {
 	batadv_debugfs_destroy();
+	batadv_netlink_unregister();
 	rtnl_link_unregister(&batadv_link_ops);
 	unregister_netdevice_notifier(&batadv_hard_if_notifier);
 	batadv_hardif_remove_interfaces();
@@ -141,6 +144,7 @@ int batadv_mesh_init(struct net_device *soft_iface)
 	spin_lock_init(&bat_priv->tvlv.container_list_lock);
 	spin_lock_init(&bat_priv->tvlv.handler_list_lock);
 	spin_lock_init(&bat_priv->softif_vlan_list_lock);
+	spin_lock_init(&bat_priv->tp_list_lock);
 
 	INIT_HLIST_HEAD(&bat_priv->forw_bat_list);
 	INIT_HLIST_HEAD(&bat_priv->forw_bcast_list);
@@ -159,6 +163,7 @@ int batadv_mesh_init(struct net_device *soft_iface)
 	INIT_HLIST_HEAD(&bat_priv->tvlv.container_list);
 	INIT_HLIST_HEAD(&bat_priv->tvlv.handler_list);
 	INIT_HLIST_HEAD(&bat_priv->softif_vlan_list);
+	INIT_HLIST_HEAD(&bat_priv->tp_list);
 
 	ret = batadv_v_mesh_init(bat_priv);
 	if (ret < 0)
@@ -538,76 +543,6 @@ void batadv_recv_handler_unregister(u8 packet_type)
 	batadv_rx_handler[packet_type] = batadv_recv_unhandled_packet;
 }
 
-static struct batadv_algo_ops *batadv_algo_get(char *name)
-{
-	struct batadv_algo_ops *bat_algo_ops = NULL, *bat_algo_ops_tmp;
-
-	hlist_for_each_entry(bat_algo_ops_tmp, &batadv_algo_list, list) {
-		if (strcmp(bat_algo_ops_tmp->name, name) != 0)
-			continue;
-
-		bat_algo_ops = bat_algo_ops_tmp;
-		break;
-	}
-
-	return bat_algo_ops;
-}
-
-int batadv_algo_register(struct batadv_algo_ops *bat_algo_ops)
-{
-	struct batadv_algo_ops *bat_algo_ops_tmp;
-
-	bat_algo_ops_tmp = batadv_algo_get(bat_algo_ops->name);
-	if (bat_algo_ops_tmp) {
-		pr_info("Trying to register already registered routing algorithm: %s\n",
-			bat_algo_ops->name);
-		return -EEXIST;
-	}
-
-	/* all algorithms must implement all ops (for now) */
-	if (!bat_algo_ops->bat_iface_enable ||
-	    !bat_algo_ops->bat_iface_disable ||
-	    !bat_algo_ops->bat_iface_update_mac ||
-	    !bat_algo_ops->bat_primary_iface_set ||
-	    !bat_algo_ops->bat_neigh_cmp ||
-	    !bat_algo_ops->bat_neigh_is_similar_or_better) {
-		pr_info("Routing algo '%s' does not implement required ops\n",
-			bat_algo_ops->name);
-		return -EINVAL;
-	}
-
-	INIT_HLIST_NODE(&bat_algo_ops->list);
-	hlist_add_head(&bat_algo_ops->list, &batadv_algo_list);
-
-	return 0;
-}
-
-int batadv_algo_select(struct batadv_priv *bat_priv, char *name)
-{
-	struct batadv_algo_ops *bat_algo_ops;
-
-	bat_algo_ops = batadv_algo_get(name);
-	if (!bat_algo_ops)
-		return -EINVAL;
-
-	bat_priv->bat_algo_ops = bat_algo_ops;
-
-	return 0;
-}
-
-int batadv_algo_seq_print_text(struct seq_file *seq, void *offset)
-{
-	struct batadv_algo_ops *bat_algo_ops;
-
-	seq_puts(seq, "Available routing algorithms:\n");
-
-	hlist_for_each_entry(bat_algo_ops, &batadv_algo_list, list) {
-		seq_printf(seq, " * %s\n", bat_algo_ops->name);
-	}
-
-	return 0;
-}
-
 /**
  * batadv_skb_crc32 - calculate CRC32 of the whole packet and skip bytes in
  *  the header
@@ -641,594 +576,6 @@ __be32 batadv_skb_crc32(struct sk_buff *skb, u8 *payload_ptr)
 	return htonl(crc);
 }
 
-/**
- * batadv_tvlv_handler_release - release tvlv handler from lists and queue for
- *  free after rcu grace period
- * @ref: kref pointer of the tvlv
- */
-static void batadv_tvlv_handler_release(struct kref *ref)
-{
-	struct batadv_tvlv_handler *tvlv_handler;
-
-	tvlv_handler = container_of(ref, struct batadv_tvlv_handler, refcount);
-	kfree_rcu(tvlv_handler, rcu);
-}
-
-/**
- * batadv_tvlv_handler_put - decrement the tvlv container refcounter and
- *  possibly release it
- * @tvlv_handler: the tvlv handler to free
- */
-static void batadv_tvlv_handler_put(struct batadv_tvlv_handler *tvlv_handler)
-{
-	kref_put(&tvlv_handler->refcount, batadv_tvlv_handler_release);
-}
-
-/**
- * batadv_tvlv_handler_get - retrieve tvlv handler from the tvlv handler list
- *  based on the provided type and version (both need to match)
- * @bat_priv: the bat priv with all the soft interface information
- * @type: tvlv handler type to look for
- * @version: tvlv handler version to look for
- *
- * Return: tvlv handler if found or NULL otherwise.
- */
-static struct batadv_tvlv_handler *
-batadv_tvlv_handler_get(struct batadv_priv *bat_priv, u8 type, u8 version)
-{
-	struct batadv_tvlv_handler *tvlv_handler_tmp, *tvlv_handler = NULL;
-
-	rcu_read_lock();
-	hlist_for_each_entry_rcu(tvlv_handler_tmp,
-				 &bat_priv->tvlv.handler_list, list) {
-		if (tvlv_handler_tmp->type != type)
-			continue;
-
-		if (tvlv_handler_tmp->version != version)
-			continue;
-
-		if (!kref_get_unless_zero(&tvlv_handler_tmp->refcount))
-			continue;
-
-		tvlv_handler = tvlv_handler_tmp;
-		break;
-	}
-	rcu_read_unlock();
-
-	return tvlv_handler;
-}
-
-/**
- * batadv_tvlv_container_release - release tvlv from lists and free
- * @ref: kref pointer of the tvlv
- */
-static void batadv_tvlv_container_release(struct kref *ref)
-{
-	struct batadv_tvlv_container *tvlv;
-
-	tvlv = container_of(ref, struct batadv_tvlv_container, refcount);
-	kfree(tvlv);
-}
-
-/**
- * batadv_tvlv_container_put - decrement the tvlv container refcounter and
- *  possibly release it
- * @tvlv: the tvlv container to free
- */
-static void batadv_tvlv_container_put(struct batadv_tvlv_container *tvlv)
-{
-	kref_put(&tvlv->refcount, batadv_tvlv_container_release);
-}
-
-/**
- * batadv_tvlv_container_get - retrieve tvlv container from the tvlv container
- *  list based on the provided type and version (both need to match)
- * @bat_priv: the bat priv with all the soft interface information
- * @type: tvlv container type to look for
- * @version: tvlv container version to look for
- *
- * Has to be called with the appropriate locks being acquired
- * (tvlv.container_list_lock).
- *
- * Return: tvlv container if found or NULL otherwise.
- */
-static struct batadv_tvlv_container *
-batadv_tvlv_container_get(struct batadv_priv *bat_priv, u8 type, u8 version)
-{
-	struct batadv_tvlv_container *tvlv_tmp, *tvlv = NULL;
-
-	lockdep_assert_held(&bat_priv->tvlv.container_list_lock);
-
-	hlist_for_each_entry(tvlv_tmp, &bat_priv->tvlv.container_list, list) {
-		if (tvlv_tmp->tvlv_hdr.type != type)
-			continue;
-
-		if (tvlv_tmp->tvlv_hdr.version != version)
-			continue;
-
-		kref_get(&tvlv_tmp->refcount);
-		tvlv = tvlv_tmp;
-		break;
-	}
-
-	return tvlv;
-}
-
-/**
- * batadv_tvlv_container_list_size - calculate the size of the tvlv container
- *  list entries
- * @bat_priv: the bat priv with all the soft interface information
- *
- * Has to be called with the appropriate locks being acquired
- * (tvlv.container_list_lock).
- *
- * Return: size of all currently registered tvlv containers in bytes.
- */
-static u16 batadv_tvlv_container_list_size(struct batadv_priv *bat_priv)
-{
-	struct batadv_tvlv_container *tvlv;
-	u16 tvlv_len = 0;
-
-	lockdep_assert_held(&bat_priv->tvlv.container_list_lock);
-
-	hlist_for_each_entry(tvlv, &bat_priv->tvlv.container_list, list) {
-		tvlv_len += sizeof(struct batadv_tvlv_hdr);
-		tvlv_len += ntohs(tvlv->tvlv_hdr.len);
-	}
-
-	return tvlv_len;
-}
-
-/**
- * batadv_tvlv_container_remove - remove tvlv container from the tvlv container
- *  list
- * @bat_priv: the bat priv with all the soft interface information
- * @tvlv: the to be removed tvlv container
- *
- * Has to be called with the appropriate locks being acquired
- * (tvlv.container_list_lock).
- */
-static void batadv_tvlv_container_remove(struct batadv_priv *bat_priv,
-					 struct batadv_tvlv_container *tvlv)
-{
-	lockdep_assert_held(&bat_priv->tvlv.container_list_lock);
-
-	if (!tvlv)
-		return;
-
-	hlist_del(&tvlv->list);
-
-	/* first call to decrement the counter, second call to free */
-	batadv_tvlv_container_put(tvlv);
-	batadv_tvlv_container_put(tvlv);
-}
-
-/**
- * batadv_tvlv_container_unregister - unregister tvlv container based on the
- *  provided type and version (both need to match)
- * @bat_priv: the bat priv with all the soft interface information
- * @type: tvlv container type to unregister
- * @version: tvlv container type to unregister
- */
-void batadv_tvlv_container_unregister(struct batadv_priv *bat_priv,
-				      u8 type, u8 version)
-{
-	struct batadv_tvlv_container *tvlv;
-
-	spin_lock_bh(&bat_priv->tvlv.container_list_lock);
-	tvlv = batadv_tvlv_container_get(bat_priv, type, version);
-	batadv_tvlv_container_remove(bat_priv, tvlv);
-	spin_unlock_bh(&bat_priv->tvlv.container_list_lock);
-}
-
-/**
- * batadv_tvlv_container_register - register tvlv type, version and content
- *  to be propagated with each (primary interface) OGM
- * @bat_priv: the bat priv with all the soft interface information
- * @type: tvlv container type
- * @version: tvlv container version
- * @tvlv_value: tvlv container content
- * @tvlv_value_len: tvlv container content length
- *
- * If a container of the same type and version was already registered the new
- * content is going to replace the old one.
- */
-void batadv_tvlv_container_register(struct batadv_priv *bat_priv,
-				    u8 type, u8 version,
-				    void *tvlv_value, u16 tvlv_value_len)
-{
-	struct batadv_tvlv_container *tvlv_old, *tvlv_new;
-
-	if (!tvlv_value)
-		tvlv_value_len = 0;
-
-	tvlv_new = kzalloc(sizeof(*tvlv_new) + tvlv_value_len, GFP_ATOMIC);
-	if (!tvlv_new)
-		return;
-
-	tvlv_new->tvlv_hdr.version = version;
-	tvlv_new->tvlv_hdr.type = type;
-	tvlv_new->tvlv_hdr.len = htons(tvlv_value_len);
-
-	memcpy(tvlv_new + 1, tvlv_value, ntohs(tvlv_new->tvlv_hdr.len));
-	INIT_HLIST_NODE(&tvlv_new->list);
-	kref_init(&tvlv_new->refcount);
-
-	spin_lock_bh(&bat_priv->tvlv.container_list_lock);
-	tvlv_old = batadv_tvlv_container_get(bat_priv, type, version);
-	batadv_tvlv_container_remove(bat_priv, tvlv_old);
-	hlist_add_head(&tvlv_new->list, &bat_priv->tvlv.container_list);
-	spin_unlock_bh(&bat_priv->tvlv.container_list_lock);
-}
-
-/**
- * batadv_tvlv_realloc_packet_buff - reallocate packet buffer to accommodate
- *  requested packet size
- * @packet_buff: packet buffer
- * @packet_buff_len: packet buffer size
- * @min_packet_len: requested packet minimum size
- * @additional_packet_len: requested additional packet size on top of minimum
- *  size
- *
- * Return: true of the packet buffer could be changed to the requested size,
- * false otherwise.
- */
-static bool batadv_tvlv_realloc_packet_buff(unsigned char **packet_buff,
-					    int *packet_buff_len,
-					    int min_packet_len,
-					    int additional_packet_len)
-{
-	unsigned char *new_buff;
-
-	new_buff = kmalloc(min_packet_len + additional_packet_len, GFP_ATOMIC);
-
-	/* keep old buffer if kmalloc should fail */
-	if (!new_buff)
-		return false;
-
-	memcpy(new_buff, *packet_buff, min_packet_len);
-	kfree(*packet_buff);
-	*packet_buff = new_buff;
-	*packet_buff_len = min_packet_len + additional_packet_len;
-
-	return true;
-}
-
-/**
- * batadv_tvlv_container_ogm_append - append tvlv container content to given
- *  OGM packet buffer
- * @bat_priv: the bat priv with all the soft interface information
- * @packet_buff: ogm packet buffer
- * @packet_buff_len: ogm packet buffer size including ogm header and tvlv
- *  content
- * @packet_min_len: ogm header size to be preserved for the OGM itself
- *
- * The ogm packet might be enlarged or shrunk depending on the current size
- * and the size of the to-be-appended tvlv containers.
- *
- * Return: size of all appended tvlv containers in bytes.
- */
-u16 batadv_tvlv_container_ogm_append(struct batadv_priv *bat_priv,
-				     unsigned char **packet_buff,
-				     int *packet_buff_len, int packet_min_len)
-{
-	struct batadv_tvlv_container *tvlv;
-	struct batadv_tvlv_hdr *tvlv_hdr;
-	u16 tvlv_value_len;
-	void *tvlv_value;
-	bool ret;
-
-	spin_lock_bh(&bat_priv->tvlv.container_list_lock);
-	tvlv_value_len = batadv_tvlv_container_list_size(bat_priv);
-
-	ret = batadv_tvlv_realloc_packet_buff(packet_buff, packet_buff_len,
-					      packet_min_len, tvlv_value_len);
-
-	if (!ret)
-		goto end;
-
-	if (!tvlv_value_len)
-		goto end;
-
-	tvlv_value = (*packet_buff) + packet_min_len;
-
-	hlist_for_each_entry(tvlv, &bat_priv->tvlv.container_list, list) {
-		tvlv_hdr = tvlv_value;
-		tvlv_hdr->type = tvlv->tvlv_hdr.type;
-		tvlv_hdr->version = tvlv->tvlv_hdr.version;
-		tvlv_hdr->len = tvlv->tvlv_hdr.len;
-		tvlv_value = tvlv_hdr + 1;
-		memcpy(tvlv_value, tvlv + 1, ntohs(tvlv->tvlv_hdr.len));
-		tvlv_value = (u8 *)tvlv_value + ntohs(tvlv->tvlv_hdr.len);
-	}
-
-end:
-	spin_unlock_bh(&bat_priv->tvlv.container_list_lock);
-	return tvlv_value_len;
-}
-
-/**
- * batadv_tvlv_call_handler - parse the given tvlv buffer to call the
- *  appropriate handlers
- * @bat_priv: the bat priv with all the soft interface information
- * @tvlv_handler: tvlv callback function handling the tvlv content
- * @ogm_source: flag indicating whether the tvlv is an ogm or a unicast packet
- * @orig_node: orig node emitting the ogm packet
- * @src: source mac address of the unicast packet
- * @dst: destination mac address of the unicast packet
- * @tvlv_value: tvlv content
- * @tvlv_value_len: tvlv content length
- *
- * Return: success if handler was not found or the return value of the handler
- * callback.
- */
-static int batadv_tvlv_call_handler(struct batadv_priv *bat_priv,
-				    struct batadv_tvlv_handler *tvlv_handler,
-				    bool ogm_source,
-				    struct batadv_orig_node *orig_node,
-				    u8 *src, u8 *dst,
-				    void *tvlv_value, u16 tvlv_value_len)
-{
-	if (!tvlv_handler)
-		return NET_RX_SUCCESS;
-
-	if (ogm_source) {
-		if (!tvlv_handler->ogm_handler)
-			return NET_RX_SUCCESS;
-
-		if (!orig_node)
-			return NET_RX_SUCCESS;
-
-		tvlv_handler->ogm_handler(bat_priv, orig_node,
-					  BATADV_NO_FLAGS,
-					  tvlv_value, tvlv_value_len);
-		tvlv_handler->flags |= BATADV_TVLV_HANDLER_OGM_CALLED;
-	} else {
-		if (!src)
-			return NET_RX_SUCCESS;
-
-		if (!dst)
-			return NET_RX_SUCCESS;
-
-		if (!tvlv_handler->unicast_handler)
-			return NET_RX_SUCCESS;
-
-		return tvlv_handler->unicast_handler(bat_priv, src,
-						     dst, tvlv_value,
-						     tvlv_value_len);
-	}
-
-	return NET_RX_SUCCESS;
-}
-
-/**
- * batadv_tvlv_containers_process - parse the given tvlv buffer to call the
- *  appropriate handlers
- * @bat_priv: the bat priv with all the soft interface information
- * @ogm_source: flag indicating whether the tvlv is an ogm or a unicast packet
- * @orig_node: orig node emitting the ogm packet
- * @src: source mac address of the unicast packet
- * @dst: destination mac address of the unicast packet
- * @tvlv_value: tvlv content
- * @tvlv_value_len: tvlv content length
- *
- * Return: success when processing an OGM or the return value of all called
- * handler callbacks.
- */
-int batadv_tvlv_containers_process(struct batadv_priv *bat_priv,
-				   bool ogm_source,
-				   struct batadv_orig_node *orig_node,
-				   u8 *src, u8 *dst,
-				   void *tvlv_value, u16 tvlv_value_len)
-{
-	struct batadv_tvlv_handler *tvlv_handler;
-	struct batadv_tvlv_hdr *tvlv_hdr;
-	u16 tvlv_value_cont_len;
-	u8 cifnotfound = BATADV_TVLV_HANDLER_OGM_CIFNOTFND;
-	int ret = NET_RX_SUCCESS;
-
-	while (tvlv_value_len >= sizeof(*tvlv_hdr)) {
-		tvlv_hdr = tvlv_value;
-		tvlv_value_cont_len = ntohs(tvlv_hdr->len);
-		tvlv_value = tvlv_hdr + 1;
-		tvlv_value_len -= sizeof(*tvlv_hdr);
-
-		if (tvlv_value_cont_len > tvlv_value_len)
-			break;
-
-		tvlv_handler = batadv_tvlv_handler_get(bat_priv,
-						       tvlv_hdr->type,
-						       tvlv_hdr->version);
-
-		ret |= batadv_tvlv_call_handler(bat_priv, tvlv_handler,
-						ogm_source, orig_node,
-						src, dst, tvlv_value,
-						tvlv_value_cont_len);
-		if (tvlv_handler)
-			batadv_tvlv_handler_put(tvlv_handler);
-		tvlv_value = (u8 *)tvlv_value + tvlv_value_cont_len;
-		tvlv_value_len -= tvlv_value_cont_len;
-	}
-
-	if (!ogm_source)
-		return ret;
-
-	rcu_read_lock();
-	hlist_for_each_entry_rcu(tvlv_handler,
-				 &bat_priv->tvlv.handler_list, list) {
-		if ((tvlv_handler->flags & BATADV_TVLV_HANDLER_OGM_CIFNOTFND) &&
-		    !(tvlv_handler->flags & BATADV_TVLV_HANDLER_OGM_CALLED))
-			tvlv_handler->ogm_handler(bat_priv, orig_node,
-						  cifnotfound, NULL, 0);
-
-		tvlv_handler->flags &= ~BATADV_TVLV_HANDLER_OGM_CALLED;
-	}
-	rcu_read_unlock();
-
-	return NET_RX_SUCCESS;
-}
-
-/**
- * batadv_tvlv_ogm_receive - process an incoming ogm and call the appropriate
- *  handlers
- * @bat_priv: the bat priv with all the soft interface information
- * @batadv_ogm_packet: ogm packet containing the tvlv containers
- * @orig_node: orig node emitting the ogm packet
- */
-void batadv_tvlv_ogm_receive(struct batadv_priv *bat_priv,
-			     struct batadv_ogm_packet *batadv_ogm_packet,
-			     struct batadv_orig_node *orig_node)
-{
-	void *tvlv_value;
-	u16 tvlv_value_len;
-
-	if (!batadv_ogm_packet)
-		return;
-
-	tvlv_value_len = ntohs(batadv_ogm_packet->tvlv_len);
-	if (!tvlv_value_len)
-		return;
-
-	tvlv_value = batadv_ogm_packet + 1;
-
-	batadv_tvlv_containers_process(bat_priv, true, orig_node, NULL, NULL,
-				       tvlv_value, tvlv_value_len);
-}
-
-/**
- * batadv_tvlv_handler_register - register tvlv handler based on the provided
- *  type and version (both need to match) for ogm tvlv payload and/or unicast
- *  payload
- * @bat_priv: the bat priv with all the soft interface information
- * @optr: ogm tvlv handler callback function. This function receives the orig
- *  node, flags and the tvlv content as argument to process.
- * @uptr: unicast tvlv handler callback function. This function receives the
- *  source & destination of the unicast packet as well as the tvlv content
- *  to process.
- * @type: tvlv handler type to be registered
- * @version: tvlv handler version to be registered
- * @flags: flags to enable or disable TVLV API behavior
- */
-void batadv_tvlv_handler_register(struct batadv_priv *bat_priv,
-				  void (*optr)(struct batadv_priv *bat_priv,
-					       struct batadv_orig_node *orig,
-					       u8 flags,
-					       void *tvlv_value,
-					       u16 tvlv_value_len),
-				  int (*uptr)(struct batadv_priv *bat_priv,
-					      u8 *src, u8 *dst,
-					      void *tvlv_value,
-					      u16 tvlv_value_len),
-				  u8 type, u8 version, u8 flags)
-{
-	struct batadv_tvlv_handler *tvlv_handler;
-
-	tvlv_handler = batadv_tvlv_handler_get(bat_priv, type, version);
-	if (tvlv_handler) {
-		batadv_tvlv_handler_put(tvlv_handler);
-		return;
-	}
-
-	tvlv_handler = kzalloc(sizeof(*tvlv_handler), GFP_ATOMIC);
-	if (!tvlv_handler)
-		return;
-
-	tvlv_handler->ogm_handler = optr;
-	tvlv_handler->unicast_handler = uptr;
-	tvlv_handler->type = type;
-	tvlv_handler->version = version;
-	tvlv_handler->flags = flags;
-	kref_init(&tvlv_handler->refcount);
-	INIT_HLIST_NODE(&tvlv_handler->list);
-
-	spin_lock_bh(&bat_priv->tvlv.handler_list_lock);
-	hlist_add_head_rcu(&tvlv_handler->list, &bat_priv->tvlv.handler_list);
-	spin_unlock_bh(&bat_priv->tvlv.handler_list_lock);
-}
-
-/**
- * batadv_tvlv_handler_unregister - unregister tvlv handler based on the
- *  provided type and version (both need to match)
- * @bat_priv: the bat priv with all the soft interface information
- * @type: tvlv handler type to be unregistered
- * @version: tvlv handler version to be unregistered
- */
-void batadv_tvlv_handler_unregister(struct batadv_priv *bat_priv,
-				    u8 type, u8 version)
-{
-	struct batadv_tvlv_handler *tvlv_handler;
-
-	tvlv_handler = batadv_tvlv_handler_get(bat_priv, type, version);
-	if (!tvlv_handler)
-		return;
-
-	batadv_tvlv_handler_put(tvlv_handler);
-	spin_lock_bh(&bat_priv->tvlv.handler_list_lock);
-	hlist_del_rcu(&tvlv_handler->list);
-	spin_unlock_bh(&bat_priv->tvlv.handler_list_lock);
-	batadv_tvlv_handler_put(tvlv_handler);
-}
-
-/**
- * batadv_tvlv_unicast_send - send a unicast packet with tvlv payload to the
- *  specified host
- * @bat_priv: the bat priv with all the soft interface information
- * @src: source mac address of the unicast packet
- * @dst: destination mac address of the unicast packet
- * @type: tvlv type
- * @version: tvlv version
- * @tvlv_value: tvlv content
- * @tvlv_value_len: tvlv content length
- */
-void batadv_tvlv_unicast_send(struct batadv_priv *bat_priv, u8 *src,
-			      u8 *dst, u8 type, u8 version,
-			      void *tvlv_value, u16 tvlv_value_len)
-{
-	struct batadv_unicast_tvlv_packet *unicast_tvlv_packet;
-	struct batadv_tvlv_hdr *tvlv_hdr;
-	struct batadv_orig_node *orig_node;
-	struct sk_buff *skb;
-	unsigned char *tvlv_buff;
-	unsigned int tvlv_len;
-	ssize_t hdr_len = sizeof(*unicast_tvlv_packet);
-
-	orig_node = batadv_orig_hash_find(bat_priv, dst);
-	if (!orig_node)
-		return;
-
-	tvlv_len = sizeof(*tvlv_hdr) + tvlv_value_len;
-
-	skb = netdev_alloc_skb_ip_align(NULL, ETH_HLEN + hdr_len + tvlv_len);
-	if (!skb)
-		goto out;
-
-	skb->priority = TC_PRIO_CONTROL;
-	skb_reserve(skb, ETH_HLEN);
-	tvlv_buff = skb_put(skb, sizeof(*unicast_tvlv_packet) + tvlv_len);
-	unicast_tvlv_packet = (struct batadv_unicast_tvlv_packet *)tvlv_buff;
-	unicast_tvlv_packet->packet_type = BATADV_UNICAST_TVLV;
-	unicast_tvlv_packet->version = BATADV_COMPAT_VERSION;
-	unicast_tvlv_packet->ttl = BATADV_TTL;
-	unicast_tvlv_packet->reserved = 0;
-	unicast_tvlv_packet->tvlv_len = htons(tvlv_len);
-	unicast_tvlv_packet->align = 0;
-	ether_addr_copy(unicast_tvlv_packet->src, src);
-	ether_addr_copy(unicast_tvlv_packet->dst, dst);
-
-	tvlv_buff = (unsigned char *)(unicast_tvlv_packet + 1);
-	tvlv_hdr = (struct batadv_tvlv_hdr *)tvlv_buff;
-	tvlv_hdr->version = version;
-	tvlv_hdr->type = type;
-	tvlv_hdr->len = htons(tvlv_value_len);
-	tvlv_buff += sizeof(*tvlv_hdr);
-	memcpy(tvlv_buff, tvlv_value, tvlv_value_len);
-
-	if (batadv_send_skb_to_orig(skb, orig_node, NULL) == NET_XMIT_DROP)
-		kfree_skb(skb);
-out:
-	batadv_orig_node_put(orig_node);
-}
-
 /**
  * batadv_get_vid - extract the VLAN identifier from skb if any
  * @skb: the buffer containing the packet
@@ -1282,36 +629,6 @@ bool batadv_vlan_ap_isola_get(struct batadv_priv *bat_priv, unsigned short vid)
 	return ap_isolation_enabled;
 }
 
-static int batadv_param_set_ra(const char *val, const struct kernel_param *kp)
-{
-	struct batadv_algo_ops *bat_algo_ops;
-	char *algo_name = (char *)val;
-	size_t name_len = strlen(algo_name);
-
-	if (name_len > 0 && algo_name[name_len - 1] == '\n')
-		algo_name[name_len - 1] = '\0';
-
-	bat_algo_ops = batadv_algo_get(algo_name);
-	if (!bat_algo_ops) {
-		pr_err("Routing algorithm '%s' is not supported\n", algo_name);
-		return -EINVAL;
-	}
-
-	return param_set_copystring(algo_name, kp);
-}
-
-static const struct kernel_param_ops batadv_param_ops_ra = {
-	.set = batadv_param_set_ra,
-	.get = param_get_string,
-};
-
-static struct kparam_string batadv_param_string_ra = {
-	.maxlen = sizeof(batadv_routing_algo),
-	.string = batadv_routing_algo,
-};
-
-module_param_cb(routing_algo, &batadv_param_ops_ra, &batadv_param_string_ra,
-		0644);
 module_init(batadv_init);
 module_exit(batadv_exit);
 

net/batman-adv/main.h

@@ -100,6 +100,9 @@
 #define BATADV_NUM_BCASTS_WIRELESS 3
 #define BATADV_NUM_BCASTS_MAX 3
 
+/* length of the single packet used by the TP meter */
+#define BATADV_TP_PACKET_LEN ETH_DATA_LEN
+
 /* msecs after which an ARP_REQUEST is sent in broadcast as fallback */
 #define ARP_REQ_DELAY 250
 /* numbers of originator to contact for any PUT/GET DHT operation */
@@ -131,6 +134,11 @@
 
 #define BATADV_NC_NODE_TIMEOUT 10000 /* Milliseconds */
 
+/**
+ * BATADV_TP_MAX_NUM - maximum number of simultaneously active tp sessions
+ */
+#define BATADV_TP_MAX_NUM 5
+
 enum batadv_mesh_state {
 	BATADV_MESH_INACTIVE,
 	BATADV_MESH_ACTIVE,
@@ -175,29 +183,26 @@ enum batadv_uev_type {
 
 /* Kernel headers */
 
-#include <linux/atomic.h>
 #include <linux/bitops.h> /* for packet.h */
 #include <linux/compiler.h>
 #include <linux/cpumask.h>
 #include <linux/etherdevice.h>
 #include <linux/if_ether.h> /* for packet.h */
-#include <linux/netdevice.h>
-#include <linux/printk.h>
-#include <linux/types.h>
-#include <linux/percpu.h>
-#include <linux/jiffies.h>
 #include <linux/if_vlan.h>
+#include <linux/jiffies.h>
+#include <linux/percpu.h>
+#include <linux/types.h>
 
 #include "types.h"
 
-struct batadv_ogm_packet;
+struct net_device;
+struct packet_type;
 struct seq_file;
 struct sk_buff;
 
 #define BATADV_PRINT_VID(vid) ((vid & BATADV_VLAN_HAS_TAG) ? \
 			       (int)(vid & VLAN_VID_MASK) : -1)
 
-extern char batadv_routing_algo[];
 extern struct list_head batadv_hardif_list;
 
 extern unsigned char batadv_broadcast_addr[];
@@ -218,75 +223,8 @@ batadv_recv_handler_register(u8 packet_type,
 			     int (*recv_handler)(struct sk_buff *,
 						 struct batadv_hard_iface *));
 void batadv_recv_handler_unregister(u8 packet_type);
-int batadv_algo_register(struct batadv_algo_ops *bat_algo_ops);
-int batadv_algo_select(struct batadv_priv *bat_priv, char *name);
-int batadv_algo_seq_print_text(struct seq_file *seq, void *offset);
 __be32 batadv_skb_crc32(struct sk_buff *skb, u8 *payload_ptr);
 
-/**
- * enum batadv_dbg_level - available log levels
- * @BATADV_DBG_BATMAN: OGM and TQ computations related messages
- * @BATADV_DBG_ROUTES: route added / changed / deleted
- * @BATADV_DBG_TT: translation table messages
- * @BATADV_DBG_BLA: bridge loop avoidance messages
- * @BATADV_DBG_DAT: ARP snooping and DAT related messages
- * @BATADV_DBG_NC: network coding related messages
- * @BATADV_DBG_MCAST: multicast related messages
- * @BATADV_DBG_ALL: the union of all the above log levels
- */
-enum batadv_dbg_level {
-	BATADV_DBG_BATMAN = BIT(0),
-	BATADV_DBG_ROUTES = BIT(1),
-	BATADV_DBG_TT	  = BIT(2),
-	BATADV_DBG_BLA    = BIT(3),
-	BATADV_DBG_DAT    = BIT(4),
-	BATADV_DBG_NC	  = BIT(5),
-	BATADV_DBG_MCAST  = BIT(6),
-	BATADV_DBG_ALL    = 127,
-};
-
-#ifdef CONFIG_BATMAN_ADV_DEBUG
-int batadv_debug_log(struct batadv_priv *bat_priv, const char *fmt, ...)
-__printf(2, 3);
-
-/* possibly ratelimited debug output */
-#define _batadv_dbg(type, bat_priv, ratelimited, fmt, arg...)	\
-	do {							\
-		if (atomic_read(&bat_priv->log_level) & type && \
-		    (!ratelimited || net_ratelimit()))		\
-			batadv_debug_log(bat_priv, fmt, ## arg);\
-	}							\
-	while (0)
-#else /* !CONFIG_BATMAN_ADV_DEBUG */
-__printf(4, 5)
-static inline void _batadv_dbg(int type __always_unused,
-			       struct batadv_priv *bat_priv __always_unused,
-			       int ratelimited __always_unused,
-			       const char *fmt __always_unused, ...)
-{
-}
-#endif
-
-#define batadv_dbg(type, bat_priv, arg...) \
-	_batadv_dbg(type, bat_priv, 0, ## arg)
-#define batadv_dbg_ratelimited(type, bat_priv, arg...) \
-	_batadv_dbg(type, bat_priv, 1, ## arg)
-
-#define batadv_info(net_dev, fmt, arg...)				\
-	do {								\
-		struct net_device *_netdev = (net_dev);                 \
-		struct batadv_priv *_batpriv = netdev_priv(_netdev);    \
-		batadv_dbg(BATADV_DBG_ALL, _batpriv, fmt, ## arg);	\
-		pr_info("%s: " fmt, _netdev->name, ## arg);		\
-	} while (0)
-#define batadv_err(net_dev, fmt, arg...)				\
-	do {								\
-		struct net_device *_netdev = (net_dev);                 \
-		struct batadv_priv *_batpriv = netdev_priv(_netdev);    \
-		batadv_dbg(BATADV_DBG_ALL, _batpriv, fmt, ## arg);	\
-		pr_err("%s: " fmt, _netdev->name, ## arg);		\
-	} while (0)
-
 /**
  * batadv_compare_eth - Compare two not u16 aligned Ethernet addresses
  * @data1: Pointer to a six-byte array containing the Ethernet address
@@ -372,39 +310,6 @@ static inline u64 batadv_sum_counter(struct batadv_priv *bat_priv,  size_t idx)
  */
 #define BATADV_SKB_CB(__skb)       ((struct batadv_skb_cb *)&((__skb)->cb[0]))
 
-void batadv_tvlv_container_register(struct batadv_priv *bat_priv,
-				    u8 type, u8 version,
-				    void *tvlv_value, u16 tvlv_value_len);
-u16 batadv_tvlv_container_ogm_append(struct batadv_priv *bat_priv,
-				     unsigned char **packet_buff,
-				     int *packet_buff_len, int packet_min_len);
-void batadv_tvlv_ogm_receive(struct batadv_priv *bat_priv,
-			     struct batadv_ogm_packet *batadv_ogm_packet,
-			     struct batadv_orig_node *orig_node);
-void batadv_tvlv_container_unregister(struct batadv_priv *bat_priv,
-				      u8 type, u8 version);
-
-void batadv_tvlv_handler_register(struct batadv_priv *bat_priv,
-				  void (*optr)(struct batadv_priv *bat_priv,
-					       struct batadv_orig_node *orig,
-					       u8 flags,
-					       void *tvlv_value,
-					       u16 tvlv_value_len),
-				  int (*uptr)(struct batadv_priv *bat_priv,
-					      u8 *src, u8 *dst,
-					      void *tvlv_value,
-					      u16 tvlv_value_len),
-				  u8 type, u8 version, u8 flags);
-void batadv_tvlv_handler_unregister(struct batadv_priv *bat_priv,
-				    u8 type, u8 version);
-int batadv_tvlv_containers_process(struct batadv_priv *bat_priv,
-				   bool ogm_source,
-				   struct batadv_orig_node *orig_node,
-				   u8 *src, u8 *dst,
-				   void *tvlv_buff, u16 tvlv_buff_len);
-void batadv_tvlv_unicast_send(struct batadv_priv *bat_priv, u8 *src,
-			      u8 *dst, u8 type, u8 version,
-			      void *tvlv_value, u16 tvlv_value_len);
 unsigned short batadv_get_vid(struct sk_buff *skb, size_t header_len);
 bool batadv_vlan_ap_isola_get(struct batadv_priv *bat_priv, unsigned short vid);
 

net/batman-adv/multicast.c

@@ -55,8 +55,10 @@
 
 #include "hard-interface.h"
 #include "hash.h"
+#include "log.h"
 #include "packet.h"
 #include "translation-table.h"
+#include "tvlv.h"
 
 /**
  * batadv_mcast_get_bridge - get the bridge on top of the softif if it exists

net/batman-adv/netlink.c

+/* Copyright (C) 2016 B.A.T.M.A.N. contributors:
+ *
+ * Matthias Schiffer
+ *
+ * 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 "netlink.h"
+#include "main.h"
+
+#include <linux/errno.h>
+#include <linux/fs.h>
+#include <linux/genetlink.h>
+#include <linux/if_ether.h>
+#include <linux/init.h>
+#include <linux/netdevice.h>
+#include <linux/netlink.h>
+#include <linux/printk.h>
+#include <linux/stddef.h>
+#include <linux/types.h>
+#include <net/genetlink.h>
+#include <net/netlink.h>
+#include <uapi/linux/batman_adv.h>
+
+#include "hard-interface.h"
+#include "soft-interface.h"
+#include "tp_meter.h"
+
+struct sk_buff;
+
+static struct genl_family batadv_netlink_family = {
+	.id = GENL_ID_GENERATE,
+	.hdrsize = 0,
+	.name = BATADV_NL_NAME,
+	.version = 1,
+	.maxattr = BATADV_ATTR_MAX,
+};
+
+/* multicast groups */
+enum batadv_netlink_multicast_groups {
+	BATADV_NL_MCGRP_TPMETER,
+};
+
+static struct genl_multicast_group batadv_netlink_mcgrps[] = {
+	[BATADV_NL_MCGRP_TPMETER] = { .name = BATADV_NL_MCAST_GROUP_TPMETER },
+};
+
+static struct nla_policy batadv_netlink_policy[NUM_BATADV_ATTR] = {
+	[BATADV_ATTR_VERSION]		= { .type = NLA_STRING },
+	[BATADV_ATTR_ALGO_NAME]		= { .type = NLA_STRING },
+	[BATADV_ATTR_MESH_IFINDEX]	= { .type = NLA_U32 },
+	[BATADV_ATTR_MESH_IFNAME]	= { .type = NLA_STRING },
+	[BATADV_ATTR_MESH_ADDRESS]	= { .len = ETH_ALEN },
+	[BATADV_ATTR_HARD_IFINDEX]	= { .type = NLA_U32 },
+	[BATADV_ATTR_HARD_IFNAME]	= { .type = NLA_STRING },
+	[BATADV_ATTR_HARD_ADDRESS]	= { .len = ETH_ALEN },
+	[BATADV_ATTR_ORIG_ADDRESS]	= { .len = ETH_ALEN },
+	[BATADV_ATTR_TPMETER_RESULT]	= { .type = NLA_U8 },
+	[BATADV_ATTR_TPMETER_TEST_TIME]	= { .type = NLA_U32 },
+	[BATADV_ATTR_TPMETER_BYTES]	= { .type = NLA_U64 },
+	[BATADV_ATTR_TPMETER_COOKIE]	= { .type = NLA_U32 },
+};
+
+/**
+ * batadv_netlink_mesh_info_put - fill in generic information about mesh
+ *  interface
+ * @msg: netlink message to be sent back
+ * @soft_iface: interface for which the data should be taken
+ *
+ * Return: 0 on success, < 0 on error
+ */
+static int
+batadv_netlink_mesh_info_put(struct sk_buff *msg, struct net_device *soft_iface)
+{
+	struct batadv_priv *bat_priv = netdev_priv(soft_iface);
+	struct batadv_hard_iface *primary_if = NULL;
+	struct net_device *hard_iface;
+	int ret = -ENOBUFS;
+
+	if (nla_put_string(msg, BATADV_ATTR_VERSION, BATADV_SOURCE_VERSION) ||
+	    nla_put_string(msg, BATADV_ATTR_ALGO_NAME,
+			   bat_priv->algo_ops->name) ||
+	    nla_put_u32(msg, BATADV_ATTR_MESH_IFINDEX, soft_iface->ifindex) ||
+	    nla_put_string(msg, BATADV_ATTR_MESH_IFNAME, soft_iface->name) ||
+	    nla_put(msg, BATADV_ATTR_MESH_ADDRESS, ETH_ALEN,
+		    soft_iface->dev_addr))
+		goto out;
+
+	primary_if = batadv_primary_if_get_selected(bat_priv);
+	if (primary_if && primary_if->if_status == BATADV_IF_ACTIVE) {
+		hard_iface = primary_if->net_dev;
+
+		if (nla_put_u32(msg, BATADV_ATTR_HARD_IFINDEX,
+				hard_iface->ifindex) ||
+		    nla_put_string(msg, BATADV_ATTR_HARD_IFNAME,
+				   hard_iface->name) ||
+		    nla_put(msg, BATADV_ATTR_HARD_ADDRESS, ETH_ALEN,
+			    hard_iface->dev_addr))
+			goto out;
+	}
+
+	ret = 0;
+
+ out:
+	if (primary_if)
+		batadv_hardif_put(primary_if);
+
+	return ret;
+}
+
+/**
+ * batadv_netlink_get_mesh_info - handle incoming BATADV_CMD_GET_MESH_INFO
+ *  netlink request
+ * @skb: received netlink message
+ * @info: receiver information
+ *
+ * Return: 0 on success, < 0 on error
+ */
+static int
+batadv_netlink_get_mesh_info(struct sk_buff *skb, struct genl_info *info)
+{
+	struct net *net = genl_info_net(info);
+	struct net_device *soft_iface;
+	struct sk_buff *msg = NULL;
+	void *msg_head;
+	int ifindex;
+	int ret;
+
+	if (!info->attrs[BATADV_ATTR_MESH_IFINDEX])
+		return -EINVAL;
+
+	ifindex = nla_get_u32(info->attrs[BATADV_ATTR_MESH_IFINDEX]);
+	if (!ifindex)
+		return -EINVAL;
+
+	soft_iface = dev_get_by_index(net, ifindex);
+	if (!soft_iface || !batadv_softif_is_valid(soft_iface)) {
+		ret = -ENODEV;
+		goto out;
+	}
+
+	msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
+	if (!msg) {
+		ret = -ENOMEM;
+		goto out;
+	}
+
+	msg_head = genlmsg_put(msg, info->snd_portid, info->snd_seq,
+			       &batadv_netlink_family, 0,
+			       BATADV_CMD_GET_MESH_INFO);
+	if (!msg_head) {
+		ret = -ENOBUFS;
+		goto out;
+	}
+
+	ret = batadv_netlink_mesh_info_put(msg, soft_iface);
+
+ out:
+	if (soft_iface)
+		dev_put(soft_iface);
+
+	if (ret) {
+		if (msg)
+			nlmsg_free(msg);
+		return ret;
+	}
+
+	genlmsg_end(msg, msg_head);
+	return genlmsg_reply(msg, info);
+}
+
+/**
+ * batadv_netlink_tp_meter_put - Fill information of started tp_meter session
+ * @msg: netlink message to be sent back
+ * @cookie: tp meter session cookie
+ *
+ *  Return: 0 on success, < 0 on error
+ */
+static int
+batadv_netlink_tp_meter_put(struct sk_buff *msg, u32 cookie)
+{
+	if (nla_put_u32(msg, BATADV_ATTR_TPMETER_COOKIE, cookie))
+		return -ENOBUFS;
+
+	return 0;
+}
+
+/**
+ * batadv_netlink_tpmeter_notify - send tp_meter result via netlink to client
+ * @bat_priv: the bat priv with all the soft interface information
+ * @dst: destination of tp_meter session
+ * @result: reason for tp meter session stop
+ * @test_time: total time ot the tp_meter session
+ * @total_bytes: bytes acked to the receiver
+ * @cookie: cookie of tp_meter session
+ *
+ * Return: 0 on success, < 0 on error
+ */
+int batadv_netlink_tpmeter_notify(struct batadv_priv *bat_priv, const u8 *dst,
+				  u8 result, u32 test_time, u64 total_bytes,
+				  u32 cookie)
+{
+	struct sk_buff *msg;
+	void *hdr;
+	int ret;
+
+	msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
+	if (!msg)
+		return -ENOMEM;
+
+	hdr = genlmsg_put(msg, 0, 0, &batadv_netlink_family, 0,
+			  BATADV_CMD_TP_METER);
+	if (!hdr) {
+		ret = -ENOBUFS;
+		goto err_genlmsg;
+	}
+
+	if (nla_put_u32(msg, BATADV_ATTR_TPMETER_COOKIE, cookie))
+		goto nla_put_failure;
+
+	if (nla_put_u32(msg, BATADV_ATTR_TPMETER_TEST_TIME, test_time))
+		goto nla_put_failure;
+
+	if (nla_put_u64_64bit(msg, BATADV_ATTR_TPMETER_BYTES, total_bytes,
+			      BATADV_ATTR_PAD))
+		goto nla_put_failure;
+
+	if (nla_put_u8(msg, BATADV_ATTR_TPMETER_RESULT, result))
+		goto nla_put_failure;
+
+	if (nla_put(msg, BATADV_ATTR_ORIG_ADDRESS, ETH_ALEN, dst))
+		goto nla_put_failure;
+
+	genlmsg_end(msg, hdr);
+
+	genlmsg_multicast_netns(&batadv_netlink_family,
+				dev_net(bat_priv->soft_iface), msg, 0,
+				BATADV_NL_MCGRP_TPMETER, GFP_KERNEL);
+
+	return 0;
+
+nla_put_failure:
+	genlmsg_cancel(msg, hdr);
+	ret = -EMSGSIZE;
+
+err_genlmsg:
+	nlmsg_free(msg);
+	return ret;
+}
+
+/**
+ * batadv_netlink_tp_meter_start - Start a new tp_meter session
+ * @skb: received netlink message
+ * @info: receiver information
+ *
+ * Return: 0 on success, < 0 on error
+ */
+static int
+batadv_netlink_tp_meter_start(struct sk_buff *skb, struct genl_info *info)
+{
+	struct net *net = genl_info_net(info);
+	struct net_device *soft_iface;
+	struct batadv_priv *bat_priv;
+	struct sk_buff *msg = NULL;
+	u32 test_length;
+	void *msg_head;
+	int ifindex;
+	u32 cookie;
+	u8 *dst;
+	int ret;
+
+	if (!info->attrs[BATADV_ATTR_MESH_IFINDEX])
+		return -EINVAL;
+
+	if (!info->attrs[BATADV_ATTR_ORIG_ADDRESS])
+		return -EINVAL;
+
+	if (!info->attrs[BATADV_ATTR_TPMETER_TEST_TIME])
+		return -EINVAL;
+
+	ifindex = nla_get_u32(info->attrs[BATADV_ATTR_MESH_IFINDEX]);
+	if (!ifindex)
+		return -EINVAL;
+
+	dst = nla_data(info->attrs[BATADV_ATTR_ORIG_ADDRESS]);
+
+	test_length = nla_get_u32(info->attrs[BATADV_ATTR_TPMETER_TEST_TIME]);
+
+	soft_iface = dev_get_by_index(net, ifindex);
+	if (!soft_iface || !batadv_softif_is_valid(soft_iface)) {
+		ret = -ENODEV;
+		goto out;
+	}
+
+	msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
+	if (!msg) {
+		ret = -ENOMEM;
+		goto out;
+	}
+
+	msg_head = genlmsg_put(msg, info->snd_portid, info->snd_seq,
+			       &batadv_netlink_family, 0,
+			       BATADV_CMD_TP_METER);
+	if (!msg_head) {
+		ret = -ENOBUFS;
+		goto out;
+	}
+
+	bat_priv = netdev_priv(soft_iface);
+	batadv_tp_start(bat_priv, dst, test_length, &cookie);
+
+	ret = batadv_netlink_tp_meter_put(msg, cookie);
+
+ out:
+	if (soft_iface)
+		dev_put(soft_iface);
+
+	if (ret) {
+		if (msg)
+			nlmsg_free(msg);
+		return ret;
+	}
+
+	genlmsg_end(msg, msg_head);
+	return genlmsg_reply(msg, info);
+}
+
+/**
+ * batadv_netlink_tp_meter_start - Cancel a running tp_meter session
+ * @skb: received netlink message
+ * @info: receiver information
+ *
+ * Return: 0 on success, < 0 on error
+ */
+static int
+batadv_netlink_tp_meter_cancel(struct sk_buff *skb, struct genl_info *info)
+{
+	struct net *net = genl_info_net(info);
+	struct net_device *soft_iface;
+	struct batadv_priv *bat_priv;
+	int ifindex;
+	u8 *dst;
+	int ret = 0;
+
+	if (!info->attrs[BATADV_ATTR_MESH_IFINDEX])
+		return -EINVAL;
+
+	if (!info->attrs[BATADV_ATTR_ORIG_ADDRESS])
+		return -EINVAL;
+
+	ifindex = nla_get_u32(info->attrs[BATADV_ATTR_MESH_IFINDEX]);
+	if (!ifindex)
+		return -EINVAL;
+
+	dst = nla_data(info->attrs[BATADV_ATTR_ORIG_ADDRESS]);
+
+	soft_iface = dev_get_by_index(net, ifindex);
+	if (!soft_iface || !batadv_softif_is_valid(soft_iface)) {
+		ret = -ENODEV;
+		goto out;
+	}
+
+	bat_priv = netdev_priv(soft_iface);
+	batadv_tp_stop(bat_priv, dst, BATADV_TP_REASON_CANCEL);
+
+out:
+	if (soft_iface)
+		dev_put(soft_iface);
+
+	return ret;
+}
+
+static struct genl_ops batadv_netlink_ops[] = {
+	{
+		.cmd = BATADV_CMD_GET_MESH_INFO,
+		.flags = GENL_ADMIN_PERM,
+		.policy = batadv_netlink_policy,
+		.doit = batadv_netlink_get_mesh_info,
+	},
+	{
+		.cmd = BATADV_CMD_TP_METER,
+		.flags = GENL_ADMIN_PERM,
+		.policy = batadv_netlink_policy,
+		.doit = batadv_netlink_tp_meter_start,
+	},
+	{
+		.cmd = BATADV_CMD_TP_METER_CANCEL,
+		.flags = GENL_ADMIN_PERM,
+		.policy = batadv_netlink_policy,
+		.doit = batadv_netlink_tp_meter_cancel,
+	},
+};
+
+/**
+ * batadv_netlink_register - register batadv genl netlink family
+ */
+void __init batadv_netlink_register(void)
+{
+	int ret;
+
+	ret = genl_register_family_with_ops_groups(&batadv_netlink_family,
+						   batadv_netlink_ops,
+						   batadv_netlink_mcgrps);
+	if (ret)
+		pr_warn("unable to register netlink family");
+}
+
+/**
+ * batadv_netlink_unregister - unregister batadv genl netlink family
+ */
+void batadv_netlink_unregister(void)
+{
+	genl_unregister_family(&batadv_netlink_family);
+}

net/batman-adv/netlink.h

+/* Copyright (C) 2016 B.A.T.M.A.N. contributors:
+ *
+ * Matthias Schiffer
+ *
+ * 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/>.
+ */
+
+#ifndef _NET_BATMAN_ADV_NETLINK_H_
+#define _NET_BATMAN_ADV_NETLINK_H_
+
+#include "main.h"
+
+#include <linux/types.h>
+
+void batadv_netlink_register(void);
+void batadv_netlink_unregister(void);
+
+int batadv_netlink_tpmeter_notify(struct batadv_priv *bat_priv, const u8 *dst,
+				  u8 result, u32 test_time, u64 total_bytes,
+				  u32 cookie);
+
+#endif /* _NET_BATMAN_ADV_NETLINK_H_ */

net/batman-adv/network-coding.c

@@ -51,10 +51,12 @@
 
 #include "hard-interface.h"
 #include "hash.h"
+#include "log.h"
 #include "originator.h"
 #include "packet.h"
 #include "routing.h"
 #include "send.h"
+#include "tvlv.h"
 
 static struct lock_class_key batadv_nc_coding_hash_lock_class_key;
 static struct lock_class_key batadv_nc_decoding_hash_lock_class_key;

net/batman-adv/originator.c

@@ -34,11 +34,13 @@
 #include <linux/spinlock.h>
 #include <linux/workqueue.h>
 
+#include "bat_algo.h"
 #include "distributed-arp-table.h"
 #include "fragmentation.h"
 #include "gateway_client.h"
 #include "hard-interface.h"
 #include "hash.h"
+#include "log.h"
 #include "multicast.h"
 #include "network-coding.h"
 #include "routing.h"
@@ -532,8 +534,8 @@ batadv_hardif_neigh_create(struct batadv_hard_iface *hard_iface,
 
 	kref_init(&hardif_neigh->refcount);
 
-	if (bat_priv->bat_algo_ops->bat_hardif_neigh_init)
-		bat_priv->bat_algo_ops->bat_hardif_neigh_init(hardif_neigh);
+	if (bat_priv->algo_ops->neigh.hardif_init)
+		bat_priv->algo_ops->neigh.hardif_init(hardif_neigh);
 
 	hlist_add_head(&hardif_neigh->list, &hard_iface->neigh_list);
 
@@ -704,17 +706,17 @@ int batadv_hardif_neigh_seq_print_text(struct seq_file *seq, void *offset)
 	seq_printf(seq, "[B.A.T.M.A.N. adv %s, MainIF/MAC: %s/%pM (%s %s)]\n",
 		   BATADV_SOURCE_VERSION, primary_if->net_dev->name,
 		   primary_if->net_dev->dev_addr, net_dev->name,
-		   bat_priv->bat_algo_ops->name);
+		   bat_priv->algo_ops->name);
 
 	batadv_hardif_put(primary_if);
 
-	if (!bat_priv->bat_algo_ops->bat_neigh_print) {
+	if (!bat_priv->algo_ops->neigh.print) {
 		seq_puts(seq,
 			 "No printing function for this routing protocol\n");
 		return 0;
 	}
 
-	bat_priv->bat_algo_ops->bat_neigh_print(bat_priv, seq);
+	bat_priv->algo_ops->neigh.print(bat_priv, seq);
 	return 0;
 }
 
@@ -765,8 +767,8 @@ static void batadv_orig_node_free_rcu(struct rcu_head *rcu)
 
 	batadv_frag_purge_orig(orig_node, NULL);
 
-	if (orig_node->bat_priv->bat_algo_ops->bat_orig_free)
-		orig_node->bat_priv->bat_algo_ops->bat_orig_free(orig_node);
+	if (orig_node->bat_priv->algo_ops->orig.free)
+		orig_node->bat_priv->algo_ops->orig.free(orig_node);
 
 	kfree(orig_node->tt_buff);
 	kfree(orig_node);
@@ -1095,12 +1097,12 @@ batadv_find_best_neighbor(struct batadv_priv *bat_priv,
 			  struct batadv_hard_iface *if_outgoing)
 {
 	struct batadv_neigh_node *best = NULL, *neigh;
-	struct batadv_algo_ops *bao = bat_priv->bat_algo_ops;
+	struct batadv_algo_ops *bao = bat_priv->algo_ops;
 
 	rcu_read_lock();
 	hlist_for_each_entry_rcu(neigh, &orig_node->neigh_list, list) {
-		if (best && (bao->bat_neigh_cmp(neigh, if_outgoing,
-						best, if_outgoing) <= 0))
+		if (best && (bao->neigh.cmp(neigh, if_outgoing, best,
+					    if_outgoing) <= 0))
 			continue;
 
 		if (!kref_get_unless_zero(&neigh->refcount))
@@ -1252,18 +1254,17 @@ int batadv_orig_seq_print_text(struct seq_file *seq, void *offset)
 	seq_printf(seq, "[B.A.T.M.A.N. adv %s, MainIF/MAC: %s/%pM (%s %s)]\n",
 		   BATADV_SOURCE_VERSION, primary_if->net_dev->name,
 		   primary_if->net_dev->dev_addr, net_dev->name,
-		   bat_priv->bat_algo_ops->name);
+		   bat_priv->algo_ops->name);
 
 	batadv_hardif_put(primary_if);
 
-	if (!bat_priv->bat_algo_ops->bat_orig_print) {
+	if (!bat_priv->algo_ops->orig.print) {
 		seq_puts(seq,
 			 "No printing function for this routing protocol\n");
 		return 0;
 	}
 
-	bat_priv->bat_algo_ops->bat_orig_print(bat_priv, seq,
-					       BATADV_IF_DEFAULT);
+	bat_priv->algo_ops->orig.print(bat_priv, seq, BATADV_IF_DEFAULT);
 
 	return 0;
 }
@@ -1290,7 +1291,7 @@ int batadv_orig_hardif_seq_print_text(struct seq_file *seq, void *offset)
 	}
 
 	bat_priv = netdev_priv(hard_iface->soft_iface);
-	if (!bat_priv->bat_algo_ops->bat_orig_print) {
+	if (!bat_priv->algo_ops->orig.print) {
 		seq_puts(seq,
 			 "No printing function for this routing protocol\n");
 		goto out;
@@ -1304,9 +1305,9 @@ int batadv_orig_hardif_seq_print_text(struct seq_file *seq, void *offset)
 	seq_printf(seq, "[B.A.T.M.A.N. adv %s, IF/MAC: %s/%pM (%s %s)]\n",
 		   BATADV_SOURCE_VERSION, hard_iface->net_dev->name,
 		   hard_iface->net_dev->dev_addr,
-		   hard_iface->soft_iface->name, bat_priv->bat_algo_ops->name);
+		   hard_iface->soft_iface->name, bat_priv->algo_ops->name);
 
-	bat_priv->bat_algo_ops->bat_orig_print(bat_priv, seq, hard_iface);
+	bat_priv->algo_ops->orig.print(bat_priv, seq, hard_iface);
 
 out:
 	if (hard_iface)
@@ -1318,7 +1319,7 @@ int batadv_orig_hash_add_if(struct batadv_hard_iface *hard_iface,
 			    int max_if_num)
 {
 	struct batadv_priv *bat_priv = netdev_priv(hard_iface->soft_iface);
-	struct batadv_algo_ops *bao = bat_priv->bat_algo_ops;
+	struct batadv_algo_ops *bao = bat_priv->algo_ops;
 	struct batadv_hashtable *hash = bat_priv->orig_hash;
 	struct hlist_head *head;
 	struct batadv_orig_node *orig_node;
@@ -1334,9 +1335,8 @@ int batadv_orig_hash_add_if(struct batadv_hard_iface *hard_iface,
 		rcu_read_lock();
 		hlist_for_each_entry_rcu(orig_node, head, hash_entry) {
 			ret = 0;
-			if (bao->bat_orig_add_if)
-				ret = bao->bat_orig_add_if(orig_node,
-							   max_if_num);
+			if (bao->orig.add_if)
+				ret = bao->orig.add_if(orig_node, max_if_num);
 			if (ret == -ENOMEM)
 				goto err;
 		}
@@ -1358,7 +1358,7 @@ int batadv_orig_hash_del_if(struct batadv_hard_iface *hard_iface,
 	struct hlist_head *head;
 	struct batadv_hard_iface *hard_iface_tmp;
 	struct batadv_orig_node *orig_node;
-	struct batadv_algo_ops *bao = bat_priv->bat_algo_ops;
+	struct batadv_algo_ops *bao = bat_priv->algo_ops;
 	u32 i;
 	int ret;
 
@@ -1371,10 +1371,9 @@ int batadv_orig_hash_del_if(struct batadv_hard_iface *hard_iface,
 		rcu_read_lock();
 		hlist_for_each_entry_rcu(orig_node, head, hash_entry) {
 			ret = 0;
-			if (bao->bat_orig_del_if)
-				ret = bao->bat_orig_del_if(orig_node,
-							   max_if_num,
-							   hard_iface->if_num);
+			if (bao->orig.del_if)
+				ret = bao->orig.del_if(orig_node, max_if_num,
+						       hard_iface->if_num);
 			if (ret == -ENOMEM)
 				goto err;
 		}

net/batman-adv/packet.h

@@ -21,6 +21,8 @@
 #include <asm/byteorder.h>
 #include <linux/types.h>
 
+#define batadv_tp_is_error(n) ((u8)n > 127 ? 1 : 0)
+
 /**
  * enum batadv_packettype - types for batman-adv encapsulated packets
  * @BATADV_IV_OGM: originator messages for B.A.T.M.A.N. IV
@@ -93,6 +95,7 @@ enum batadv_icmp_packettype {
 	BATADV_ECHO_REQUEST	       = 8,
 	BATADV_TTL_EXCEEDED	       = 11,
 	BATADV_PARAMETER_PROBLEM       = 12,
+	BATADV_TP		       = 15,
 };
 
 /**
@@ -284,6 +287,16 @@ struct batadv_elp_packet {
 
 #define BATADV_ELP_HLEN sizeof(struct batadv_elp_packet)
 
+/**
+ * enum batadv_icmp_user_cmd_type - types for batman-adv icmp cmd modes
+ * @BATADV_TP_START: start a throughput meter run
+ * @BATADV_TP_STOP: stop a throughput meter run
+ */
+enum batadv_icmp_user_cmd_type {
+	BATADV_TP_START		= 0,
+	BATADV_TP_STOP		= 2,
+};
+
 /**
  * struct batadv_icmp_header - common members among all the ICMP packets
  * @packet_type: batman-adv packet type, part of the general header
@@ -334,6 +347,47 @@ struct batadv_icmp_packet {
 	__be16 seqno;
 };
 
+/**
+ * struct batadv_icmp_tp_packet - ICMP TP Meter packet
+ * @packet_type: batman-adv packet type, part of the general header
+ * @version: batman-adv protocol version, part of the genereal header
+ * @ttl: time to live for this packet, part of the genereal header
+ * @msg_type: ICMP packet type
+ * @dst: address of the destination node
+ * @orig: address of the source node
+ * @uid: local ICMP socket identifier
+ * @subtype: TP packet subtype (see batadv_icmp_tp_subtype)
+ * @session: TP session identifier
+ * @seqno: the TP sequence number
+ * @timestamp: time when the packet has been sent. This value is filled in a
+ *  TP_MSG and echoed back in the next TP_ACK so that the sender can compute the
+ *  RTT. Since it is read only by the host which wrote it, there is no need to
+ *  store it using network order
+ */
+struct batadv_icmp_tp_packet {
+	u8  packet_type;
+	u8  version;
+	u8  ttl;
+	u8  msg_type; /* see ICMP message types above */
+	u8  dst[ETH_ALEN];
+	u8  orig[ETH_ALEN];
+	u8  uid;
+	u8  subtype;
+	u8  session[2];
+	__be32 seqno;
+	__be32 timestamp;
+};
+
+/**
+ * enum batadv_icmp_tp_subtype - ICMP TP Meter packet subtypes
+ * @BATADV_TP_MSG: Msg from sender to receiver
+ * @BATADV_TP_ACK: acknowledgment from receiver to sender
+ */
+enum batadv_icmp_tp_subtype {
+	BATADV_TP_MSG	= 0,
+	BATADV_TP_ACK,
+};
+
 #define BATADV_RR_LEN 16
 
 /**

net/batman-adv/routing.c

@@ -40,12 +40,15 @@
 #include "fragmentation.h"
 #include "hard-interface.h"
 #include "icmp_socket.h"
+#include "log.h"
 #include "network-coding.h"
 #include "originator.h"
 #include "packet.h"
 #include "send.h"
 #include "soft-interface.h"
+#include "tp_meter.h"
 #include "translation-table.h"
+#include "tvlv.h"
 
 static int batadv_route_unicast_packet(struct sk_buff *skb,
 				       struct batadv_hard_iface *recv_if);
@@ -268,10 +271,19 @@ static int batadv_recv_my_icmp_packet(struct batadv_priv *bat_priv,
 		icmph->ttl = BATADV_TTL;
 
 		res = batadv_send_skb_to_orig(skb, orig_node, NULL);
-		if (res != NET_XMIT_DROP)
-			ret = NET_RX_SUCCESS;
+		if (res == -1)
+			goto out;
+
+		ret = NET_RX_SUCCESS;
 
 		break;
+	case BATADV_TP:
+		if (!pskb_may_pull(skb, sizeof(struct batadv_icmp_tp_packet)))
+			goto out;
+
+		batadv_tp_meter_recv(bat_priv, skb);
+		ret = NET_RX_SUCCESS;
+		goto out;
 	default:
 		/* drop unknown type */
 		goto out;
@@ -290,7 +302,7 @@ static int batadv_recv_icmp_ttl_exceeded(struct batadv_priv *bat_priv,
 	struct batadv_hard_iface *primary_if = NULL;
 	struct batadv_orig_node *orig_node = NULL;
 	struct batadv_icmp_packet *icmp_packet;
-	int ret = NET_RX_DROP;
+	int res, ret = NET_RX_DROP;
 
 	icmp_packet = (struct batadv_icmp_packet *)skb->data;
 
@@ -321,7 +333,8 @@ static int batadv_recv_icmp_ttl_exceeded(struct batadv_priv *bat_priv,
 	icmp_packet->msg_type = BATADV_TTL_EXCEEDED;
 	icmp_packet->ttl = BATADV_TTL;
 
-	if (batadv_send_skb_to_orig(skb, orig_node, NULL) != NET_XMIT_DROP)
+	res = batadv_send_skb_to_orig(skb, orig_node, NULL);
+	if (res != -1)
 		ret = NET_RX_SUCCESS;
 
 out:
@@ -341,7 +354,7 @@ int batadv_recv_icmp_packet(struct sk_buff *skb,
 	struct ethhdr *ethhdr;
 	struct batadv_orig_node *orig_node = NULL;
 	int hdr_size = sizeof(struct batadv_icmp_header);
-	int ret = NET_RX_DROP;
+	int res, ret = NET_RX_DROP;
 
 	/* drop packet if it has not necessary minimum size */
 	if (unlikely(!pskb_may_pull(skb, hdr_size)))
@@ -408,7 +421,8 @@ int batadv_recv_icmp_packet(struct sk_buff *skb,
 	icmph->ttl--;
 
 	/* route it */
-	if (batadv_send_skb_to_orig(skb, orig_node, recv_if) != NET_XMIT_DROP)
+	res = batadv_send_skb_to_orig(skb, orig_node, recv_if);
+	if (res != -1)
 		ret = NET_RX_SUCCESS;
 
 out:
@@ -469,7 +483,7 @@ batadv_find_router(struct batadv_priv *bat_priv,
 		   struct batadv_orig_node *orig_node,
 		   struct batadv_hard_iface *recv_if)
 {
-	struct batadv_algo_ops *bao = bat_priv->bat_algo_ops;
+	struct batadv_algo_ops *bao = bat_priv->algo_ops;
 	struct batadv_neigh_node *first_candidate_router = NULL;
 	struct batadv_neigh_node *next_candidate_router = NULL;
 	struct batadv_neigh_node *router, *cand_router = NULL;
@@ -523,9 +537,9 @@ batadv_find_router(struct batadv_priv *bat_priv,
 		/* alternative candidate should be good enough to be
 		 * considered
 		 */
-		if (!bao->bat_neigh_is_similar_or_better(cand_router,
-							 cand->if_outgoing,
-							 router, recv_if))
+		if (!bao->neigh.is_similar_or_better(cand_router,
+						     cand->if_outgoing, router,
+						     recv_if))
 			goto next;
 
 		/* don't use the same router twice */
@@ -645,6 +659,8 @@ static int batadv_route_unicast_packet(struct sk_buff *skb,
 
 	len = skb->len;
 	res = batadv_send_skb_to_orig(skb, orig_node, recv_if);
+	if (res == -1)
+		goto out;
 
 	/* translate transmit result into receive result */
 	if (res == NET_XMIT_SUCCESS) {
@@ -652,13 +668,10 @@ static int batadv_route_unicast_packet(struct sk_buff *skb,
 		batadv_inc_counter(bat_priv, BATADV_CNT_FORWARD);
 		batadv_add_counter(bat_priv, BATADV_CNT_FORWARD_BYTES,
 				   len + ETH_HLEN);
-
-		ret = NET_RX_SUCCESS;
-	} else if (res == -EINPROGRESS) {
-		/* skb was buffered and consumed */
-		ret = NET_RX_SUCCESS;
 	}
 
+	ret = NET_RX_SUCCESS;
+
 out:
 	if (orig_node)
 		batadv_orig_node_put(orig_node);

net/batman-adv/send.c

@@ -20,10 +20,11 @@
 
 #include <linux/atomic.h>
 #include <linux/byteorder/generic.h>
+#include <linux/errno.h>
 #include <linux/etherdevice.h>
 #include <linux/fs.h>
-#include <linux/if_ether.h>
 #include <linux/if.h>
+#include <linux/if_ether.h>
 #include <linux/jiffies.h>
 #include <linux/kernel.h>
 #include <linux/kref.h>
@@ -42,6 +43,7 @@
 #include "fragmentation.h"
 #include "gateway_client.h"
 #include "hard-interface.h"
+#include "log.h"
 #include "network-coding.h"
 #include "originator.h"
 #include "routing.h"
@@ -71,6 +73,7 @@ int batadv_send_skb_packet(struct sk_buff *skb,
 {
 	struct batadv_priv *bat_priv;
 	struct ethhdr *ethhdr;
+	int ret;
 
 	bat_priv = netdev_priv(hard_iface->soft_iface);
 
@@ -108,8 +111,15 @@ int batadv_send_skb_packet(struct sk_buff *skb,
 	/* dev_queue_xmit() returns a negative result on error.	 However on
 	 * congestion and traffic shaping, it drops and returns NET_XMIT_DROP
 	 * (which is > 0). This will not be treated as an error.
+	 *
+	 * a negative value cannot be returned because it could be interepreted
+	 * as not consumed skb by callers of batadv_send_skb_to_orig.
 	 */
-	return dev_queue_xmit(skb);
+	ret = dev_queue_xmit(skb);
+	if (ret < 0)
+		ret = NET_XMIT_DROP;
+
+	return ret;
 send_skb_err:
 	kfree_skb(skb);
 	return NET_XMIT_DROP;
@@ -155,8 +165,11 @@ int batadv_send_unicast_skb(struct sk_buff *skb,
  * host, NULL can be passed as recv_if and no interface alternating is
  * attempted.
  *
- * Return: NET_XMIT_SUCCESS on success, NET_XMIT_DROP on failure, or
- * -EINPROGRESS if the skb is buffered for later transmit.
+ * Return: -1 on failure (and the skb is not consumed), -EINPROGRESS if the
+ * skb is buffered for later transmit or the NET_XMIT status returned by the
+ * lower routine if the packet has been passed down.
+ *
+ * If the returning value is not -1 the skb has been consumed.
  */
 int batadv_send_skb_to_orig(struct sk_buff *skb,
 			    struct batadv_orig_node *orig_node,
@@ -164,7 +177,7 @@ int batadv_send_skb_to_orig(struct sk_buff *skb,
 {
 	struct batadv_priv *bat_priv = orig_node->bat_priv;
 	struct batadv_neigh_node *neigh_node;
-	int ret = NET_XMIT_DROP;
+	int ret = -1;
 
 	/* batadv_find_router() increases neigh_nodes refcount if found. */
 	neigh_node = batadv_find_router(bat_priv, orig_node, recv_if);
@@ -177,8 +190,7 @@ int batadv_send_skb_to_orig(struct sk_buff *skb,
 	if (atomic_read(&bat_priv->fragmentation) &&
 	    skb->len > neigh_node->if_incoming->net_dev->mtu) {
 		/* Fragment and send packet. */
-		if (batadv_frag_send_packet(skb, orig_node, neigh_node))
-			ret = NET_XMIT_SUCCESS;
+		ret = batadv_frag_send_packet(skb, orig_node, neigh_node);
 
 		goto out;
 	}
@@ -187,12 +199,10 @@ int batadv_send_skb_to_orig(struct sk_buff *skb,
 	 * (i.e. being forwarded). If the packet originates from this node or if
 	 * network coding fails, then send the packet as usual.
 	 */
-	if (recv_if && batadv_nc_skb_forward(skb, neigh_node)) {
+	if (recv_if && batadv_nc_skb_forward(skb, neigh_node))
 		ret = -EINPROGRESS;
-	} else {
-		batadv_send_unicast_skb(skb, neigh_node);
-		ret = NET_XMIT_SUCCESS;
-	}
+	else
+		ret = batadv_send_unicast_skb(skb, neigh_node);
 
 out:
 	if (neigh_node)
@@ -318,7 +328,7 @@ int batadv_send_skb_unicast(struct batadv_priv *bat_priv,
 {
 	struct batadv_unicast_packet *unicast_packet;
 	struct ethhdr *ethhdr;
-	int ret = NET_XMIT_DROP;
+	int res, ret = NET_XMIT_DROP;
 
 	if (!orig_node)
 		goto out;
@@ -355,7 +365,8 @@ int batadv_send_skb_unicast(struct batadv_priv *bat_priv,
 	if (batadv_tt_global_client_is_roaming(bat_priv, ethhdr->h_dest, vid))
 		unicast_packet->ttvn = unicast_packet->ttvn - 1;
 
-	if (batadv_send_skb_to_orig(skb, orig_node, NULL) != NET_XMIT_DROP)
+	res = batadv_send_skb_to_orig(skb, orig_node, NULL);
+	if (res != -1)
 		ret = NET_XMIT_SUCCESS;
 
 out:

net/batman-adv/soft-interface.c

@@ -48,6 +48,7 @@
 #include <linux/types.h>
 #include <linux/workqueue.h>
 
+#include "bat_algo.h"
 #include "bridge_loop_avoidance.h"
 #include "debugfs.h"
 #include "distributed-arp-table.h"
@@ -841,6 +842,8 @@ static int batadv_softif_init_late(struct net_device *dev)
 #ifdef CONFIG_BATMAN_ADV_BLA
 	atomic_set(&bat_priv->bla.num_requests, 0);
 #endif
+	atomic_set(&bat_priv->tp_num, 0);
+
 	bat_priv->tt.last_changeset = NULL;
 	bat_priv->tt.last_changeset_len = 0;
 	bat_priv->isolation_mark = 0;

net/batman-adv/sysfs.c

@@ -25,8 +25,8 @@
 #include <linux/fs.h>
 #include <linux/if.h>
 #include <linux/if_vlan.h>
-#include <linux/kref.h>
 #include <linux/kernel.h>
+#include <linux/kref.h>
 #include <linux/netdevice.h>
 #include <linux/printk.h>
 #include <linux/rculist.h>
@@ -38,11 +38,12 @@
 #include <linux/string.h>
 #include <linux/stringify.h>
 
+#include "bridge_loop_avoidance.h"
 #include "distributed-arp-table.h"
 #include "gateway_client.h"
 #include "gateway_common.h"
-#include "bridge_loop_avoidance.h"
 #include "hard-interface.h"
+#include "log.h"
 #include "network-coding.h"
 #include "packet.h"
 #include "soft-interface.h"
@@ -411,7 +412,7 @@ static ssize_t batadv_show_bat_algo(struct kobject *kobj,
 {
 	struct batadv_priv *bat_priv = batadv_kobj_to_batpriv(kobj);
 
-	return sprintf(buff, "%s\n", bat_priv->bat_algo_ops->name);
+	return sprintf(buff, "%s\n", bat_priv->algo_ops->name);
 }
 
 static void batadv_post_gw_reselect(struct net_device *net_dev)

net/batman-adv/tp_meter.c

+/* Copyright (C) 2012-2016 B.A.T.M.A.N. contributors:
+ *
+ * Edo Monticelli, Antonio Quartulli
+ *
+ * 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 "tp_meter.h"
+#include "main.h"
+
+#include <linux/atomic.h>
+#include <linux/bug.h>
+#include <linux/byteorder/generic.h>
+#include <linux/cache.h>
+#include <linux/compiler.h>
+#include <linux/device.h>
+#include <linux/etherdevice.h>
+#include <linux/fs.h>
+#include <linux/if_ether.h>
+#include <linux/jiffies.h>
+#include <linux/kernel.h>
+#include <linux/kref.h>
+#include <linux/kthread.h>
+#include <linux/list.h>
+#include <linux/netdevice.h>
+#include <linux/param.h>
+#include <linux/printk.h>
+#include <linux/random.h>
+#include <linux/rculist.h>
+#include <linux/rcupdate.h>
+#include <linux/sched.h>
+#include <linux/skbuff.h>
+#include <linux/slab.h>
+#include <linux/spinlock.h>
+#include <linux/stddef.h>
+#include <linux/string.h>
+#include <linux/timer.h>
+#include <linux/wait.h>
+#include <linux/workqueue.h>
+#include <uapi/linux/batman_adv.h>
+
+#include "hard-interface.h"
+#include "log.h"
+#include "netlink.h"
+#include "originator.h"
+#include "packet.h"
+#include "send.h"
+
+/**
+ * BATADV_TP_DEF_TEST_LENGTH - Default test length if not specified by the user
+ *  in milliseconds
+ */
+#define BATADV_TP_DEF_TEST_LENGTH 10000
+
+/**
+ * BATADV_TP_AWND - Advertised window by the receiver (in bytes)
+ */
+#define BATADV_TP_AWND 0x20000000
+
+/**
+ * BATADV_TP_RECV_TIMEOUT - Receiver activity timeout. If the receiver does not
+ *  get anything for such amount of milliseconds, the connection is killed
+ */
+#define BATADV_TP_RECV_TIMEOUT 1000
+
+/**
+ * BATADV_TP_MAX_RTO - Maximum sender timeout. If the sender RTO gets beyond
+ * such amound of milliseconds, the receiver is considered unreachable and the
+ * connection is killed
+ */
+#define BATADV_TP_MAX_RTO 30000
+
+/**
+ * BATADV_TP_FIRST_SEQ - First seqno of each session. The number is rather high
+ *  in order to immediately trigger a wrap around (test purposes)
+ */
+#define BATADV_TP_FIRST_SEQ ((u32)-1 - 2000)
+
+/**
+ * BATADV_TP_PLEN - length of the payload (data after the batadv_unicast header)
+ *  to simulate
+ */
+#define BATADV_TP_PLEN (BATADV_TP_PACKET_LEN - ETH_HLEN - \
+			sizeof(struct batadv_unicast_packet))
+
+static u8 batadv_tp_prerandom[4096] __read_mostly;
+
+/**
+ * batadv_tp_session_cookie - generate session cookie based on session ids
+ * @session: TP session identifier
+ * @icmp_uid: icmp pseudo uid of the tp session
+ *
+ * Return: 32 bit tp_meter session cookie
+ */
+static u32 batadv_tp_session_cookie(const u8 session[2], u8 icmp_uid)
+{
+	u32 cookie;
+
+	cookie = icmp_uid << 16;
+	cookie |= session[0] << 8;
+	cookie |= session[1];
+
+	return cookie;
+}
+
+/**
+ * batadv_tp_cwnd - compute the new cwnd size
+ * @base: base cwnd size value
+ * @increment: the value to add to base to get the new size
+ * @min: minumim cwnd value (usually MSS)
+ *
+ * Return the new cwnd size and ensures it does not exceed the Advertised
+ * Receiver Window size. It is wrap around safe.
+ * For details refer to Section 3.1 of RFC5681
+ *
+ * Return: new congestion window size in bytes
+ */
+static u32 batadv_tp_cwnd(u32 base, u32 increment, u32 min)
+{
+	u32 new_size = base + increment;
+
+	/* check for wrap-around */
+	if (new_size < base)
+		new_size = (u32)ULONG_MAX;
+
+	new_size = min_t(u32, new_size, BATADV_TP_AWND);
+
+	return max_t(u32, new_size, min);
+}
+
+/**
+ * batadv_tp_updated_cwnd - update the Congestion Windows
+ * @tp_vars: the private data of the current TP meter session
+ * @mss: maximum segment size of transmission
+ *
+ * 1) if the session is in Slow Start, the CWND has to be increased by 1
+ * MSS every unique received ACK
+ * 2) if the session is in Congestion Avoidance, the CWND has to be
+ * increased by MSS * MSS / CWND for every unique received ACK
+ */
+static void batadv_tp_update_cwnd(struct batadv_tp_vars *tp_vars, u32 mss)
+{
+	spin_lock_bh(&tp_vars->cwnd_lock);
+
+	/* slow start... */
+	if (tp_vars->cwnd <= tp_vars->ss_threshold) {
+		tp_vars->dec_cwnd = 0;
+		tp_vars->cwnd = batadv_tp_cwnd(tp_vars->cwnd, mss, mss);
+		spin_unlock_bh(&tp_vars->cwnd_lock);
+		return;
+	}
+
+	/* increment CWND at least of 1 (section 3.1 of RFC5681) */
+	tp_vars->dec_cwnd += max_t(u32, 1U << 3,
+				   ((mss * mss) << 6) / (tp_vars->cwnd << 3));
+	if (tp_vars->dec_cwnd < (mss << 3)) {
+		spin_unlock_bh(&tp_vars->cwnd_lock);
+		return;
+	}
+
+	tp_vars->cwnd = batadv_tp_cwnd(tp_vars->cwnd, mss, mss);
+	tp_vars->dec_cwnd = 0;
+
+	spin_unlock_bh(&tp_vars->cwnd_lock);
+}
+
+/**
+ * batadv_tp_update_rto - calculate new retransmission timeout
+ * @tp_vars: the private data of the current TP meter session
+ * @new_rtt: new roundtrip time in msec
+ */
+static void batadv_tp_update_rto(struct batadv_tp_vars *tp_vars,
+				 u32 new_rtt)
+{
+	long m = new_rtt;
+
+	/* RTT update
+	 * Details in Section 2.2 and 2.3 of RFC6298
+	 *
+	 * It's tricky to understand. Don't lose hair please.
+	 * Inspired by tcp_rtt_estimator() tcp_input.c
+	 */
+	if (tp_vars->srtt != 0) {
+		m -= (tp_vars->srtt >> 3); /* m is now error in rtt est */
+		tp_vars->srtt += m; /* rtt = 7/8 srtt + 1/8 new */
+		if (m < 0)
+			m = -m;
+
+		m -= (tp_vars->rttvar >> 2);
+		tp_vars->rttvar += m; /* mdev ~= 3/4 rttvar + 1/4 new */
+	} else {
+		/* first measure getting in */
+		tp_vars->srtt = m << 3;	/* take the measured time to be srtt */
+		tp_vars->rttvar = m << 1; /* new_rtt / 2 */
+	}
+
+	/* rto = srtt + 4 * rttvar.
+	 * rttvar is scaled by 4, therefore doesn't need to be multiplied
+	 */
+	tp_vars->rto = (tp_vars->srtt >> 3) + tp_vars->rttvar;
+}
+
+/**
+ * batadv_tp_batctl_notify - send client status result to client
+ * @reason: reason for tp meter session stop
+ * @dst: destination of tp_meter session
+ * @bat_priv: the bat priv with all the soft interface information
+ * @start_time: start of transmission in jiffies
+ * @total_sent: bytes acked to the receiver
+ * @cookie: cookie of tp_meter session
+ */
+static void batadv_tp_batctl_notify(enum batadv_tp_meter_reason reason,
+				    const u8 *dst, struct batadv_priv *bat_priv,
+				    unsigned long start_time, u64 total_sent,
+				    u32 cookie)
+{
+	u32 test_time;
+	u8 result;
+	u32 total_bytes;
+
+	if (!batadv_tp_is_error(reason)) {
+		result = BATADV_TP_REASON_COMPLETE;
+		test_time = jiffies_to_msecs(jiffies - start_time);
+		total_bytes = total_sent;
+	} else {
+		result = reason;
+		test_time = 0;
+		total_bytes = 0;
+	}
+
+	batadv_netlink_tpmeter_notify(bat_priv, dst, result, test_time,
+				      total_bytes, cookie);
+}
+
+/**
+ * batadv_tp_batctl_error_notify - send client error result to client
+ * @reason: reason for tp meter session stop
+ * @dst: destination of tp_meter session
+ * @bat_priv: the bat priv with all the soft interface information
+ * @cookie: cookie of tp_meter session
+ */
+static void batadv_tp_batctl_error_notify(enum batadv_tp_meter_reason reason,
+					  const u8 *dst,
+					  struct batadv_priv *bat_priv,
+					  u32 cookie)
+{
+	batadv_tp_batctl_notify(reason, dst, bat_priv, 0, 0, cookie);
+}
+
+/**
+ * batadv_tp_list_find - find a tp_vars object in the global list
+ * @bat_priv: the bat priv with all the soft interface information
+ * @dst: the other endpoint MAC address to look for
+ *
+ * Look for a tp_vars object matching dst as end_point and return it after
+ * having incremented the refcounter. Return NULL is not found
+ *
+ * Return: matching tp_vars or NULL when no tp_vars with @dst was found
+ */
+static struct batadv_tp_vars *batadv_tp_list_find(struct batadv_priv *bat_priv,
+						  const u8 *dst)
+{
+	struct batadv_tp_vars *pos, *tp_vars = NULL;
+
+	rcu_read_lock();
+	hlist_for_each_entry_rcu(pos, &bat_priv->tp_list, list) {
+		if (!batadv_compare_eth(pos->other_end, dst))
+			continue;
+
+		/* most of the time this function is invoked during the normal
+		 * process..it makes sens to pay more when the session is
+		 * finished and to speed the process up during the measurement
+		 */
+		if (unlikely(!kref_get_unless_zero(&pos->refcount)))
+			continue;
+
+		tp_vars = pos;
+		break;
+	}
+	rcu_read_unlock();
+
+	return tp_vars;
+}
+
+/**
+ * batadv_tp_list_find_session - find tp_vars session object in the global list
+ * @bat_priv: the bat priv with all the soft interface information
+ * @dst: the other endpoint MAC address to look for
+ * @session: session identifier
+ *
+ * Look for a tp_vars object matching dst as end_point, session as tp meter
+ * session and return it after having incremented the refcounter. Return NULL
+ * is not found
+ *
+ * Return: matching tp_vars or NULL when no tp_vars was found
+ */
+static struct batadv_tp_vars *
+batadv_tp_list_find_session(struct batadv_priv *bat_priv, const u8 *dst,
+			    const u8 *session)
+{
+	struct batadv_tp_vars *pos, *tp_vars = NULL;
+
+	rcu_read_lock();
+	hlist_for_each_entry_rcu(pos, &bat_priv->tp_list, list) {
+		if (!batadv_compare_eth(pos->other_end, dst))
+			continue;
+
+		if (memcmp(pos->session, session, sizeof(pos->session)) != 0)
+			continue;
+
+		/* most of the time this function is invoked during the normal
+		 * process..it makes sense to pay more when the session is
+		 * finished and to speed the process up during the measurement
+		 */
+		if (unlikely(!kref_get_unless_zero(&pos->refcount)))
+			continue;
+
+		tp_vars = pos;
+		break;
+	}
+	rcu_read_unlock();
+
+	return tp_vars;
+}
+
+/**
+ * batadv_tp_vars_release - release batadv_tp_vars from lists and queue for
+ *  free after rcu grace period
+ * @ref: kref pointer of the batadv_tp_vars
+ */
+static void batadv_tp_vars_release(struct kref *ref)
+{
+	struct batadv_tp_vars *tp_vars;
+	struct batadv_tp_unacked *un, *safe;
+
+	tp_vars = container_of(ref, struct batadv_tp_vars, refcount);
+
+	/* lock should not be needed because this object is now out of any
+	 * context!
+	 */
+	spin_lock_bh(&tp_vars->unacked_lock);
+	list_for_each_entry_safe(un, safe, &tp_vars->unacked_list, list) {
+		list_del(&un->list);
+		kfree(un);
+	}
+	spin_unlock_bh(&tp_vars->unacked_lock);
+
+	kfree_rcu(tp_vars, rcu);
+}
+
+/**
+ * batadv_tp_vars_put - decrement the batadv_tp_vars refcounter and possibly
+ *  release it
+ * @tp_vars: the private data of the current TP meter session to be free'd
+ */
+static void batadv_tp_vars_put(struct batadv_tp_vars *tp_vars)
+{
+	kref_put(&tp_vars->refcount, batadv_tp_vars_release);
+}
+
+/**
+ * batadv_tp_sender_cleanup - cleanup sender data and drop and timer
+ * @bat_priv: the bat priv with all the soft interface information
+ * @tp_vars: the private data of the current TP meter session to cleanup
+ */
+static void batadv_tp_sender_cleanup(struct batadv_priv *bat_priv,
+				     struct batadv_tp_vars *tp_vars)
+{
+	cancel_delayed_work(&tp_vars->finish_work);
+
+	spin_lock_bh(&tp_vars->bat_priv->tp_list_lock);
+	hlist_del_rcu(&tp_vars->list);
+	spin_unlock_bh(&tp_vars->bat_priv->tp_list_lock);
+
+	/* drop list reference */
+	batadv_tp_vars_put(tp_vars);
+
+	atomic_dec(&tp_vars->bat_priv->tp_num);
+
+	/* kill the timer and remove its reference */
+	del_timer_sync(&tp_vars->timer);
+	/* the worker might have rearmed itself therefore we kill it again. Note
+	 * that if the worker should run again before invoking the following
+	 * del_timer(), it would not re-arm itself once again because the status
+	 * is OFF now
+	 */
+	del_timer(&tp_vars->timer);
+	batadv_tp_vars_put(tp_vars);
+}
+
+/**
+ * batadv_tp_sender_end - print info about ended session and inform client
+ * @bat_priv: the bat priv with all the soft interface information
+ * @tp_vars: the private data of the current TP meter session
+ */
+static void batadv_tp_sender_end(struct batadv_priv *bat_priv,
+				 struct batadv_tp_vars *tp_vars)
+{
+	u32 session_cookie;
+
+	batadv_dbg(BATADV_DBG_TP_METER, bat_priv,
+		   "Test towards %pM finished..shutting down (reason=%d)\n",
+		   tp_vars->other_end, tp_vars->reason);
+
+	batadv_dbg(BATADV_DBG_TP_METER, bat_priv,
+		   "Last timing stats: SRTT=%ums RTTVAR=%ums RTO=%ums\n",
+		   tp_vars->srtt >> 3, tp_vars->rttvar >> 2, tp_vars->rto);
+
+	batadv_dbg(BATADV_DBG_TP_METER, bat_priv,
+		   "Final values: cwnd=%u ss_threshold=%u\n",
+		   tp_vars->cwnd, tp_vars->ss_threshold);
+
+	session_cookie = batadv_tp_session_cookie(tp_vars->session,
+						  tp_vars->icmp_uid);
+
+	batadv_tp_batctl_notify(tp_vars->reason,
+				tp_vars->other_end,
+				bat_priv,
+				tp_vars->start_time,
+				atomic64_read(&tp_vars->tot_sent),
+				session_cookie);
+}
+
+/**
+ * batadv_tp_sender_shutdown - let sender thread/timer stop gracefully
+ * @tp_vars: the private data of the current TP meter session
+ * @reason: reason for tp meter session stop
+ */
+static void batadv_tp_sender_shutdown(struct batadv_tp_vars *tp_vars,
+				      enum batadv_tp_meter_reason reason)
+{
+	if (!atomic_dec_and_test(&tp_vars->sending))
+		return;
+
+	tp_vars->reason = reason;
+}
+
+/**
+ * batadv_tp_sender_finish - stop sender session after test_length was reached
+ * @work: delayed work reference of the related tp_vars
+ */
+static void batadv_tp_sender_finish(struct work_struct *work)
+{
+	struct delayed_work *delayed_work;
+	struct batadv_tp_vars *tp_vars;
+
+	delayed_work = to_delayed_work(work);
+	tp_vars = container_of(delayed_work, struct batadv_tp_vars,
+			       finish_work);
+
+	batadv_tp_sender_shutdown(tp_vars, BATADV_TP_REASON_COMPLETE);
+}
+
+/**
+ * batadv_tp_reset_sender_timer - reschedule the sender timer
+ * @tp_vars: the private TP meter data for this session
+ *
+ * Reschedule the timer using tp_vars->rto as delay
+ */
+static void batadv_tp_reset_sender_timer(struct batadv_tp_vars *tp_vars)
+{
+	/* most of the time this function is invoked while normal packet
+	 * reception...
+	 */
+	if (unlikely(atomic_read(&tp_vars->sending) == 0))
+		/* timer ref will be dropped in batadv_tp_sender_cleanup */
+		return;
+
+	mod_timer(&tp_vars->timer, jiffies + msecs_to_jiffies(tp_vars->rto));
+}
+
+/**
+ * batadv_tp_sender_timeout - timer that fires in case of packet loss
+ * @arg: address of the related tp_vars
+ *
+ * If fired it means that there was packet loss.
+ * Switch to Slow Start, set the ss_threshold to half of the current cwnd and
+ * reset the cwnd to 3*MSS
+ */
+static void batadv_tp_sender_timeout(unsigned long arg)
+{
+	struct batadv_tp_vars *tp_vars = (struct batadv_tp_vars *)arg;
+	struct batadv_priv *bat_priv = tp_vars->bat_priv;
+
+	if (atomic_read(&tp_vars->sending) == 0)
+		return;
+
+	/* if the user waited long enough...shutdown the test */
+	if (unlikely(tp_vars->rto >= BATADV_TP_MAX_RTO)) {
+		batadv_tp_sender_shutdown(tp_vars,
+					  BATADV_TP_REASON_DST_UNREACHABLE);
+		return;
+	}
+
+	/* RTO exponential backoff
+	 * Details in Section 5.5 of RFC6298
+	 */
+	tp_vars->rto <<= 1;
+
+	spin_lock_bh(&tp_vars->cwnd_lock);
+
+	tp_vars->ss_threshold = tp_vars->cwnd >> 1;
+	if (tp_vars->ss_threshold < BATADV_TP_PLEN * 2)
+		tp_vars->ss_threshold = BATADV_TP_PLEN * 2;
+
+	batadv_dbg(BATADV_DBG_TP_METER, bat_priv,
+		   "Meter: RTO fired during test towards %pM! cwnd=%u new ss_thr=%u, resetting last_sent to %u\n",
+		   tp_vars->other_end, tp_vars->cwnd, tp_vars->ss_threshold,
+		   atomic_read(&tp_vars->last_acked));
+
+	tp_vars->cwnd = BATADV_TP_PLEN * 3;
+
+	spin_unlock_bh(&tp_vars->cwnd_lock);
+
+	/* resend the non-ACKed packets.. */
+	tp_vars->last_sent = atomic_read(&tp_vars->last_acked);
+	wake_up(&tp_vars->more_bytes);
+
+	batadv_tp_reset_sender_timer(tp_vars);
+}
+
+/**
+ * batadv_tp_fill_prerandom - Fill buffer with prefetched random bytes
+ * @tp_vars: the private TP meter data for this session
+ * @buf: Buffer to fill with bytes
+ * @nbytes: amount of pseudorandom bytes
+ */
+static void batadv_tp_fill_prerandom(struct batadv_tp_vars *tp_vars,
+				     u8 *buf, size_t nbytes)
+{
+	u32 local_offset;
+	size_t bytes_inbuf;
+	size_t to_copy;
+	size_t pos = 0;
+
+	spin_lock_bh(&tp_vars->prerandom_lock);
+	local_offset = tp_vars->prerandom_offset;
+	tp_vars->prerandom_offset += nbytes;
+	tp_vars->prerandom_offset %= sizeof(batadv_tp_prerandom);
+	spin_unlock_bh(&tp_vars->prerandom_lock);
+
+	while (nbytes) {
+		local_offset %= sizeof(batadv_tp_prerandom);
+		bytes_inbuf = sizeof(batadv_tp_prerandom) - local_offset;
+		to_copy = min(nbytes, bytes_inbuf);
+
+		memcpy(&buf[pos], &batadv_tp_prerandom[local_offset], to_copy);
+		pos += to_copy;
+		nbytes -= to_copy;
+		local_offset = 0;
+	}
+}
+
+/**
+ * batadv_tp_send_msg - send a single message
+ * @tp_vars: the private TP meter data for this session
+ * @src: source mac address
+ * @orig_node: the originator of the destination
+ * @seqno: sequence number of this packet
+ * @len: length of the entire packet
+ * @session: session identifier
+ * @uid: local ICMP "socket" index
+ * @timestamp: timestamp in jiffies which is replied in ack
+ *
+ * Create and send a single TP Meter message.
+ *
+ * Return: 0 on success, BATADV_TP_REASON_DST_UNREACHABLE if the destination is
+ * not reachable, BATADV_TP_REASON_MEMORY_ERROR if the packet couldn't be
+ * allocated
+ */
+static int batadv_tp_send_msg(struct batadv_tp_vars *tp_vars, const u8 *src,
+			      struct batadv_orig_node *orig_node,
+			      u32 seqno, size_t len, const u8 *session,
+			      int uid, u32 timestamp)
+{
+	struct batadv_icmp_tp_packet *icmp;
+	struct sk_buff *skb;
+	int r;
+	u8 *data;
+	size_t data_len;
+
+	skb = netdev_alloc_skb_ip_align(NULL, len + ETH_HLEN);
+	if (unlikely(!skb))
+		return BATADV_TP_REASON_MEMORY_ERROR;
+
+	skb_reserve(skb, ETH_HLEN);
+	icmp = (struct batadv_icmp_tp_packet *)skb_put(skb, sizeof(*icmp));
+
+	/* fill the icmp header */
+	ether_addr_copy(icmp->dst, orig_node->orig);
+	ether_addr_copy(icmp->orig, src);
+	icmp->version = BATADV_COMPAT_VERSION;
+	icmp->packet_type = BATADV_ICMP;
+	icmp->ttl = BATADV_TTL;
+	icmp->msg_type = BATADV_TP;
+	icmp->uid = uid;
+
+	icmp->subtype = BATADV_TP_MSG;
+	memcpy(icmp->session, session, sizeof(icmp->session));
+	icmp->seqno = htonl(seqno);
+	icmp->timestamp = htonl(timestamp);
+
+	data_len = len - sizeof(*icmp);
+	data = (u8 *)skb_put(skb, data_len);
+	batadv_tp_fill_prerandom(tp_vars, data, data_len);
+
+	r = batadv_send_skb_to_orig(skb, orig_node, NULL);
+	if (r == -1)
+		kfree_skb(skb);
+
+	if (r == NET_XMIT_SUCCESS)
+		return 0;
+
+	return BATADV_TP_REASON_CANT_SEND;
+}
+
+/**
+ * batadv_tp_recv_ack - ACK receiving function
+ * @bat_priv: the bat priv with all the soft interface information
+ * @skb: the buffer containing the received packet
+ *
+ * Process a received TP ACK packet
+ */
+static void batadv_tp_recv_ack(struct batadv_priv *bat_priv,
+			       const struct sk_buff *skb)
+{
+	struct batadv_hard_iface *primary_if = NULL;
+	struct batadv_orig_node *orig_node = NULL;
+	const struct batadv_icmp_tp_packet *icmp;
+	struct batadv_tp_vars *tp_vars;
+	size_t packet_len, mss;
+	u32 rtt, recv_ack, cwnd;
+	unsigned char *dev_addr;
+
+	packet_len = BATADV_TP_PLEN;
+	mss = BATADV_TP_PLEN;
+	packet_len += sizeof(struct batadv_unicast_packet);
+
+	icmp = (struct batadv_icmp_tp_packet *)skb->data;
+
+	/* find the tp_vars */
+	tp_vars = batadv_tp_list_find_session(bat_priv, icmp->orig,
+					      icmp->session);
+	if (unlikely(!tp_vars))
+		return;
+
+	if (unlikely(atomic_read(&tp_vars->sending) == 0))
+		goto out;
+
+	/* old ACK? silently drop it.. */
+	if (batadv_seq_before(ntohl(icmp->seqno),
+			      (u32)atomic_read(&tp_vars->last_acked)))
+		goto out;
+
+	primary_if = batadv_primary_if_get_selected(bat_priv);
+	if (unlikely(!primary_if))
+		goto out;
+
+	orig_node = batadv_orig_hash_find(bat_priv, icmp->orig);
+	if (unlikely(!orig_node))
+		goto out;
+
+	/* update RTO with the new sampled RTT, if any */
+	rtt = jiffies_to_msecs(jiffies) - ntohl(icmp->timestamp);
+	if (icmp->timestamp && rtt)
+		batadv_tp_update_rto(tp_vars, rtt);
+
+	/* ACK for new data... reset the timer */
+	batadv_tp_reset_sender_timer(tp_vars);
+
+	recv_ack = ntohl(icmp->seqno);
+
+	/* check if this ACK is a duplicate */
+	if (atomic_read(&tp_vars->last_acked) == recv_ack) {
+		atomic_inc(&tp_vars->dup_acks);
+		if (atomic_read(&tp_vars->dup_acks) != 3)
+			goto out;
+
+		if (recv_ack >= tp_vars->recover)
+			goto out;
+
+		/* if this is the third duplicate ACK do Fast Retransmit */
+		batadv_tp_send_msg(tp_vars, primary_if->net_dev->dev_addr,
+				   orig_node, recv_ack, packet_len,
+				   icmp->session, icmp->uid,
+				   jiffies_to_msecs(jiffies));
+
+		spin_lock_bh(&tp_vars->cwnd_lock);
+
+		/* Fast Recovery */
+		tp_vars->fast_recovery = true;
+		/* Set recover to the last outstanding seqno when Fast Recovery
+		 * is entered. RFC6582, Section 3.2, step 1
+		 */
+		tp_vars->recover = tp_vars->last_sent;
+		tp_vars->ss_threshold = tp_vars->cwnd >> 1;
+		batadv_dbg(BATADV_DBG_TP_METER, bat_priv,
+			   "Meter: Fast Recovery, (cur cwnd=%u) ss_thr=%u last_sent=%u recv_ack=%u\n",
+			   tp_vars->cwnd, tp_vars->ss_threshold,
+			   tp_vars->last_sent, recv_ack);
+		tp_vars->cwnd = batadv_tp_cwnd(tp_vars->ss_threshold, 3 * mss,
+					       mss);
+		tp_vars->dec_cwnd = 0;
+		tp_vars->last_sent = recv_ack;
+
+		spin_unlock_bh(&tp_vars->cwnd_lock);
+	} else {
+		/* count the acked data */
+		atomic64_add(recv_ack - atomic_read(&tp_vars->last_acked),
+			     &tp_vars->tot_sent);
+		/* reset the duplicate ACKs counter */
+		atomic_set(&tp_vars->dup_acks, 0);
+
+		if (tp_vars->fast_recovery) {
+			/* partial ACK */
+			if (batadv_seq_before(recv_ack, tp_vars->recover)) {
+				/* this is another hole in the window. React
+				 * immediately as specified by NewReno (see
+				 * Section 3.2 of RFC6582 for details)
+				 */
+				dev_addr = primary_if->net_dev->dev_addr;
+				batadv_tp_send_msg(tp_vars, dev_addr,
+						   orig_node, recv_ack,
+						   packet_len, icmp->session,
+						   icmp->uid,
+						   jiffies_to_msecs(jiffies));
+				tp_vars->cwnd = batadv_tp_cwnd(tp_vars->cwnd,
+							       mss, mss);
+			} else {
+				tp_vars->fast_recovery = false;
+				/* set cwnd to the value of ss_threshold at the
+				 * moment that Fast Recovery was entered.
+				 * RFC6582, Section 3.2, step 3
+				 */
+				cwnd = batadv_tp_cwnd(tp_vars->ss_threshold, 0,
+						      mss);
+				tp_vars->cwnd = cwnd;
+			}
+			goto move_twnd;
+		}
+
+		if (recv_ack - atomic_read(&tp_vars->last_acked) >= mss)
+			batadv_tp_update_cwnd(tp_vars, mss);
+move_twnd:
+		/* move the Transmit Window */
+		atomic_set(&tp_vars->last_acked, recv_ack);
+	}
+
+	wake_up(&tp_vars->more_bytes);
+out:
+	if (likely(primary_if))
+		batadv_hardif_put(primary_if);
+	if (likely(orig_node))
+		batadv_orig_node_put(orig_node);
+	if (likely(tp_vars))
+		batadv_tp_vars_put(tp_vars);
+}
+
+/**
+ * batadv_tp_avail - check if congestion window is not full
+ * @tp_vars: the private data of the current TP meter session
+ * @payload_len: size of the payload of a single message
+ *
+ * Return: true when congestion window is not full, false otherwise
+ */
+static bool batadv_tp_avail(struct batadv_tp_vars *tp_vars,
+			    size_t payload_len)
+{
+	u32 win_left, win_limit;
+
+	win_limit = atomic_read(&tp_vars->last_acked) + tp_vars->cwnd;
+	win_left = win_limit - tp_vars->last_sent;
+
+	return win_left >= payload_len;
+}
+
+/**
+ * batadv_tp_wait_available - wait until congestion window becomes free or
+ *  timeout is reached
+ * @tp_vars: the private data of the current TP meter session
+ * @plen: size of the payload of a single message
+ *
+ * Return: 0 if the condition evaluated to false after the timeout elapsed,
+ *  1 if the condition evaluated to true after the timeout elapsed, the
+ *  remaining jiffies (at least 1) if the condition evaluated to true before
+ *  the timeout elapsed, or -ERESTARTSYS if it was interrupted by a signal.
+ */
+static int batadv_tp_wait_available(struct batadv_tp_vars *tp_vars, size_t plen)
+{
+	int ret;
+
+	ret = wait_event_interruptible_timeout(tp_vars->more_bytes,
+					       batadv_tp_avail(tp_vars, plen),
+					       HZ / 10);
+
+	return ret;
+}
+
+/**
+ * batadv_tp_send - main sending thread of a tp meter session
+ * @arg: address of the related tp_vars
+ *
+ * Return: nothing, this function never returns
+ */
+static int batadv_tp_send(void *arg)
+{
+	struct batadv_tp_vars *tp_vars = arg;
+	struct batadv_priv *bat_priv = tp_vars->bat_priv;
+	struct batadv_hard_iface *primary_if = NULL;
+	struct batadv_orig_node *orig_node = NULL;
+	size_t payload_len, packet_len;
+	int err = 0;
+
+	if (unlikely(tp_vars->role != BATADV_TP_SENDER)) {
+		err = BATADV_TP_REASON_DST_UNREACHABLE;
+		tp_vars->reason = err;
+		goto out;
+	}
+
+	orig_node = batadv_orig_hash_find(bat_priv, tp_vars->other_end);
+	if (unlikely(!orig_node)) {
+		err = BATADV_TP_REASON_DST_UNREACHABLE;
+		tp_vars->reason = err;
+		goto out;
+	}
+
+	primary_if = batadv_primary_if_get_selected(bat_priv);
+	if (unlikely(!primary_if)) {
+		err = BATADV_TP_REASON_DST_UNREACHABLE;
+		goto out;
+	}
+
+	/* assume that all the hard_interfaces have a correctly
+	 * configured MTU, so use the soft_iface MTU as MSS.
+	 * This might not be true and in that case the fragmentation
+	 * should be used.
+	 * Now, try to send the packet as it is
+	 */
+	payload_len = BATADV_TP_PLEN;
+	BUILD_BUG_ON(sizeof(struct batadv_icmp_tp_packet) > BATADV_TP_PLEN);
+
+	batadv_tp_reset_sender_timer(tp_vars);
+
+	/* queue the worker in charge of terminating the test */
+	queue_delayed_work(batadv_event_workqueue, &tp_vars->finish_work,
+			   msecs_to_jiffies(tp_vars->test_length));
+
+	while (atomic_read(&tp_vars->sending) != 0) {
+		if (unlikely(!batadv_tp_avail(tp_vars, payload_len))) {
+			batadv_tp_wait_available(tp_vars, payload_len);
+			continue;
+		}
+
+		/* to emulate normal unicast traffic, add to the payload len
+		 * the size of the unicast header
+		 */
+		packet_len = payload_len + sizeof(struct batadv_unicast_packet);
+
+		err = batadv_tp_send_msg(tp_vars, primary_if->net_dev->dev_addr,
+					 orig_node, tp_vars->last_sent,
+					 packet_len,
+					 tp_vars->session, tp_vars->icmp_uid,
+					 jiffies_to_msecs(jiffies));
+
+		/* something went wrong during the preparation/transmission */
+		if (unlikely(err && err != BATADV_TP_REASON_CANT_SEND)) {
+			batadv_dbg(BATADV_DBG_TP_METER, bat_priv,
+				   "Meter: batadv_tp_send() cannot send packets (%d)\n",
+				   err);
+			/* ensure nobody else tries to stop the thread now */
+			if (atomic_dec_and_test(&tp_vars->sending))
+				tp_vars->reason = err;
+			break;
+		}
+
+		/* right-shift the TWND */
+		if (!err)
+			tp_vars->last_sent += payload_len;
+
+		cond_resched();
+	}
+
+out:
+	if (likely(primary_if))
+		batadv_hardif_put(primary_if);
+	if (likely(orig_node))
+		batadv_orig_node_put(orig_node);
+
+	batadv_tp_sender_end(bat_priv, tp_vars);
+	batadv_tp_sender_cleanup(bat_priv, tp_vars);
+
+	batadv_tp_vars_put(tp_vars);
+
+	do_exit(0);
+}
+
+/**
+ * batadv_tp_start_kthread - start new thread which manages the tp meter sender
+ * @tp_vars: the private data of the current TP meter session
+ */
+static void batadv_tp_start_kthread(struct batadv_tp_vars *tp_vars)
+{
+	struct task_struct *kthread;
+	struct batadv_priv *bat_priv = tp_vars->bat_priv;
+	u32 session_cookie;
+
+	kref_get(&tp_vars->refcount);
+	kthread = kthread_create(batadv_tp_send, tp_vars, "kbatadv_tp_meter");
+	if (IS_ERR(kthread)) {
+		session_cookie = batadv_tp_session_cookie(tp_vars->session,
+							  tp_vars->icmp_uid);
+		pr_err("batadv: cannot create tp meter kthread\n");
+		batadv_tp_batctl_error_notify(BATADV_TP_REASON_MEMORY_ERROR,
+					      tp_vars->other_end,
+					      bat_priv, session_cookie);
+
+		/* drop reserved reference for kthread */
+		batadv_tp_vars_put(tp_vars);
+
+		/* cleanup of failed tp meter variables */
+		batadv_tp_sender_cleanup(bat_priv, tp_vars);
+		return;
+	}
+
+	wake_up_process(kthread);
+}
+
+/**
+ * batadv_tp_start - start a new tp meter session
+ * @bat_priv: the bat priv with all the soft interface information
+ * @dst: the receiver MAC address
+ * @test_length: test length in milliseconds
+ * @cookie: session cookie
+ */
+void batadv_tp_start(struct batadv_priv *bat_priv, const u8 *dst,
+		     u32 test_length, u32 *cookie)
+{
+	struct batadv_tp_vars *tp_vars;
+	u8 session_id[2];
+	u8 icmp_uid;
+	u32 session_cookie;
+
+	get_random_bytes(session_id, sizeof(session_id));
+	get_random_bytes(&icmp_uid, 1);
+	session_cookie = batadv_tp_session_cookie(session_id, icmp_uid);
+	*cookie = session_cookie;
+
+	/* look for an already existing test towards this node */
+	spin_lock_bh(&bat_priv->tp_list_lock);
+	tp_vars = batadv_tp_list_find(bat_priv, dst);
+	if (tp_vars) {
+		spin_unlock_bh(&bat_priv->tp_list_lock);
+		batadv_tp_vars_put(tp_vars);
+		batadv_dbg(BATADV_DBG_TP_METER, bat_priv,
+			   "Meter: test to or from the same node already ongoing, aborting\n");
+		batadv_tp_batctl_error_notify(BATADV_TP_REASON_ALREADY_ONGOING,
+					      dst, bat_priv, session_cookie);
+		return;
+	}
+
+	if (!atomic_add_unless(&bat_priv->tp_num, 1, BATADV_TP_MAX_NUM)) {
+		spin_unlock_bh(&bat_priv->tp_list_lock);
+		batadv_dbg(BATADV_DBG_TP_METER, bat_priv,
+			   "Meter: too many ongoing sessions, aborting (SEND)\n");
+		batadv_tp_batctl_error_notify(BATADV_TP_REASON_TOO_MANY, dst,
+					      bat_priv, session_cookie);
+		return;
+	}
+
+	tp_vars = kmalloc(sizeof(*tp_vars), GFP_ATOMIC);
+	if (!tp_vars) {
+		spin_unlock_bh(&bat_priv->tp_list_lock);
+		batadv_dbg(BATADV_DBG_TP_METER, bat_priv,
+			   "Meter: batadv_tp_start cannot allocate list elements\n");
+		batadv_tp_batctl_error_notify(BATADV_TP_REASON_MEMORY_ERROR,
+					      dst, bat_priv, session_cookie);
+		return;
+	}
+
+	/* initialize tp_vars */
+	ether_addr_copy(tp_vars->other_end, dst);
+	kref_init(&tp_vars->refcount);
+	tp_vars->role = BATADV_TP_SENDER;
+	atomic_set(&tp_vars->sending, 1);
+	memcpy(tp_vars->session, session_id, sizeof(session_id));
+	tp_vars->icmp_uid = icmp_uid;
+
+	tp_vars->last_sent = BATADV_TP_FIRST_SEQ;
+	atomic_set(&tp_vars->last_acked, BATADV_TP_FIRST_SEQ);
+	tp_vars->fast_recovery = false;
+	tp_vars->recover = BATADV_TP_FIRST_SEQ;
+
+	/* initialise the CWND to 3*MSS (Section 3.1 in RFC5681).
+	 * For batman-adv the MSS is the size of the payload received by the
+	 * soft_interface, hence its MTU
+	 */
+	tp_vars->cwnd = BATADV_TP_PLEN * 3;
+	/* at the beginning initialise the SS threshold to the biggest possible
+	 * window size, hence the AWND size
+	 */
+	tp_vars->ss_threshold = BATADV_TP_AWND;
+
+	/* RTO initial value is 3 seconds.
+	 * Details in Section 2.1 of RFC6298
+	 */
+	tp_vars->rto = 1000;
+	tp_vars->srtt = 0;
+	tp_vars->rttvar = 0;
+
+	atomic64_set(&tp_vars->tot_sent, 0);
+
+	kref_get(&tp_vars->refcount);
+	setup_timer(&tp_vars->timer, batadv_tp_sender_timeout,
+		    (unsigned long)tp_vars);
+
+	tp_vars->bat_priv = bat_priv;
+	tp_vars->start_time = jiffies;
+
+	init_waitqueue_head(&tp_vars->more_bytes);
+
+	spin_lock_init(&tp_vars->unacked_lock);
+	INIT_LIST_HEAD(&tp_vars->unacked_list);
+
+	spin_lock_init(&tp_vars->cwnd_lock);
+
+	tp_vars->prerandom_offset = 0;
+	spin_lock_init(&tp_vars->prerandom_lock);
+
+	kref_get(&tp_vars->refcount);
+	hlist_add_head_rcu(&tp_vars->list, &bat_priv->tp_list);
+	spin_unlock_bh(&bat_priv->tp_list_lock);
+
+	tp_vars->test_length = test_length;
+	if (!tp_vars->test_length)
+		tp_vars->test_length = BATADV_TP_DEF_TEST_LENGTH;
+
+	batadv_dbg(BATADV_DBG_TP_METER, bat_priv,
+		   "Meter: starting throughput meter towards %pM (length=%ums)\n",
+		   dst, test_length);
+
+	/* init work item for finished tp tests */
+	INIT_DELAYED_WORK(&tp_vars->finish_work, batadv_tp_sender_finish);
+
+	/* start tp kthread. This way the write() call issued from userspace can
+	 * happily return and avoid to block
+	 */
+	batadv_tp_start_kthread(tp_vars);
+
+	/* don't return reference to new tp_vars */
+	batadv_tp_vars_put(tp_vars);
+}
+
+/**
+ * batadv_tp_stop - stop currently running tp meter session
+ * @bat_priv: the bat priv with all the soft interface information
+ * @dst: the receiver MAC address
+ * @return_value: reason for tp meter session stop
+ */
+void batadv_tp_stop(struct batadv_priv *bat_priv, const u8 *dst,
+		    u8 return_value)
+{
+	struct batadv_orig_node *orig_node;
+	struct batadv_tp_vars *tp_vars;
+
+	batadv_dbg(BATADV_DBG_TP_METER, bat_priv,
+		   "Meter: stopping test towards %pM\n", dst);
+
+	orig_node = batadv_orig_hash_find(bat_priv, dst);
+	if (!orig_node)
+		return;
+
+	tp_vars = batadv_tp_list_find(bat_priv, orig_node->orig);
+	if (!tp_vars) {
+		batadv_dbg(BATADV_DBG_TP_METER, bat_priv,
+			   "Meter: trying to interrupt an already over connection\n");
+		goto out;
+	}
+
+	batadv_tp_sender_shutdown(tp_vars, return_value);
+	batadv_tp_vars_put(tp_vars);
+out:
+	batadv_orig_node_put(orig_node);
+}
+
+/**
+ * batadv_tp_reset_receiver_timer - reset the receiver shutdown timer
+ * @tp_vars: the private data of the current TP meter session
+ *
+ * start the receiver shutdown timer or reset it if already started
+ */
+static void batadv_tp_reset_receiver_timer(struct batadv_tp_vars *tp_vars)
+{
+	mod_timer(&tp_vars->timer,
+		  jiffies + msecs_to_jiffies(BATADV_TP_RECV_TIMEOUT));
+}
+
+/**
+ * batadv_tp_receiver_shutdown - stop a tp meter receiver when timeout is
+ *  reached without received ack
+ * @arg: address of the related tp_vars
+ */
+static void batadv_tp_receiver_shutdown(unsigned long arg)
+{
+	struct batadv_tp_vars *tp_vars = (struct batadv_tp_vars *)arg;
+	struct batadv_tp_unacked *un, *safe;
+	struct batadv_priv *bat_priv;
+
+	bat_priv = tp_vars->bat_priv;
+
+	/* if there is recent activity rearm the timer */
+	if (!batadv_has_timed_out(tp_vars->last_recv_time,
+				  BATADV_TP_RECV_TIMEOUT)) {
+		/* reset the receiver shutdown timer */
+		batadv_tp_reset_receiver_timer(tp_vars);
+		return;
+	}
+
+	batadv_dbg(BATADV_DBG_TP_METER, bat_priv,
+		   "Shutting down for inactivity (more than %dms) from %pM\n",
+		   BATADV_TP_RECV_TIMEOUT, tp_vars->other_end);
+
+	spin_lock_bh(&tp_vars->bat_priv->tp_list_lock);
+	hlist_del_rcu(&tp_vars->list);
+	spin_unlock_bh(&tp_vars->bat_priv->tp_list_lock);
+
+	/* drop list reference */
+	batadv_tp_vars_put(tp_vars);
+
+	atomic_dec(&bat_priv->tp_num);
+
+	spin_lock_bh(&tp_vars->unacked_lock);
+	list_for_each_entry_safe(un, safe, &tp_vars->unacked_list, list) {
+		list_del(&un->list);
+		kfree(un);
+	}
+	spin_unlock_bh(&tp_vars->unacked_lock);
+
+	/* drop reference of timer */
+	batadv_tp_vars_put(tp_vars);
+}
+
+/**
+ * batadv_tp_send_ack - send an ACK packet
+ * @bat_priv: the bat priv with all the soft interface information
+ * @dst: the mac address of the destination originator
+ * @seq: the sequence number to ACK
+ * @timestamp: the timestamp to echo back in the ACK
+ * @session: session identifier
+ * @socket_index: local ICMP socket identifier
+ *
+ * Return: 0 on success, a positive integer representing the reason of the
+ * failure otherwise
+ */
+static int batadv_tp_send_ack(struct batadv_priv *bat_priv, const u8 *dst,
+			      u32 seq, __be32 timestamp, const u8 *session,
+			      int socket_index)
+{
+	struct batadv_hard_iface *primary_if = NULL;
+	struct batadv_orig_node *orig_node;
+	struct batadv_icmp_tp_packet *icmp;
+	struct sk_buff *skb;
+	int r, ret;
+
+	orig_node = batadv_orig_hash_find(bat_priv, dst);
+	if (unlikely(!orig_node)) {
+		ret = BATADV_TP_REASON_DST_UNREACHABLE;
+		goto out;
+	}
+
+	primary_if = batadv_primary_if_get_selected(bat_priv);
+	if (unlikely(!primary_if)) {
+		ret = BATADV_TP_REASON_DST_UNREACHABLE;
+		goto out;
+	}
+
+	skb = netdev_alloc_skb_ip_align(NULL, sizeof(*icmp) + ETH_HLEN);
+	if (unlikely(!skb)) {
+		ret = BATADV_TP_REASON_MEMORY_ERROR;
+		goto out;
+	}
+
+	skb_reserve(skb, ETH_HLEN);
+	icmp = (struct batadv_icmp_tp_packet *)skb_put(skb, sizeof(*icmp));
+	icmp->packet_type = BATADV_ICMP;
+	icmp->version = BATADV_COMPAT_VERSION;
+	icmp->ttl = BATADV_TTL;
+	icmp->msg_type = BATADV_TP;
+	ether_addr_copy(icmp->dst, orig_node->orig);
+	ether_addr_copy(icmp->orig, primary_if->net_dev->dev_addr);
+	icmp->uid = socket_index;
+
+	icmp->subtype = BATADV_TP_ACK;
+	memcpy(icmp->session, session, sizeof(icmp->session));
+	icmp->seqno = htonl(seq);
+	icmp->timestamp = timestamp;
+
+	/* send the ack */
+	r = batadv_send_skb_to_orig(skb, orig_node, NULL);
+	if (r == -1)
+		kfree_skb(skb);
+
+	if (unlikely(r < 0) || (r == NET_XMIT_DROP)) {
+		ret = BATADV_TP_REASON_DST_UNREACHABLE;
+		goto out;
+	}
+	ret = 0;
+
+out:
+	if (likely(orig_node))
+		batadv_orig_node_put(orig_node);
+	if (likely(primary_if))
+		batadv_hardif_put(primary_if);
+
+	return ret;
+}
+
+/**
+ * batadv_tp_handle_out_of_order - store an out of order packet
+ * @tp_vars: the private data of the current TP meter session
+ * @skb: the buffer containing the received packet
+ *
+ * Store the out of order packet in the unacked list for late processing. This
+ * packets are kept in this list so that they can be ACKed at once as soon as
+ * all the previous packets have been received
+ *
+ * Return: true if the packed has been successfully processed, false otherwise
+ */
+static bool batadv_tp_handle_out_of_order(struct batadv_tp_vars *tp_vars,
+					  const struct sk_buff *skb)
+{
+	const struct batadv_icmp_tp_packet *icmp;
+	struct batadv_tp_unacked *un, *new;
+	u32 payload_len;
+	bool added = false;
+
+	new = kmalloc(sizeof(*new), GFP_ATOMIC);
+	if (unlikely(!new))
+		return false;
+
+	icmp = (struct batadv_icmp_tp_packet *)skb->data;
+
+	new->seqno = ntohl(icmp->seqno);
+	payload_len = skb->len - sizeof(struct batadv_unicast_packet);
+	new->len = payload_len;
+
+	spin_lock_bh(&tp_vars->unacked_lock);
+	/* if the list is empty immediately attach this new object */
+	if (list_empty(&tp_vars->unacked_list)) {
+		list_add(&new->list, &tp_vars->unacked_list);
+		goto out;
+	}
+
+	/* otherwise loop over the list and either drop the packet because this
+	 * is a duplicate or store it at the right position.
+	 *
+	 * The iteration is done in the reverse way because it is likely that
+	 * the last received packet (the one being processed now) has a bigger
+	 * seqno than all the others already stored.
+	 */
+	list_for_each_entry_reverse(un, &tp_vars->unacked_list, list) {
+		/* check for duplicates */
+		if (new->seqno == un->seqno) {
+			if (new->len > un->len)
+				un->len = new->len;
+			kfree(new);
+			added = true;
+			break;
+		}
+
+		/* look for the right position */
+		if (batadv_seq_before(new->seqno, un->seqno))
+			continue;
+
+		/* as soon as an entry having a bigger seqno is found, the new
+		 * one is attached _after_ it. In this way the list is kept in
+		 * ascending order
+		 */
+		list_add_tail(&new->list, &un->list);
+		added = true;
+		break;
+	}
+
+	/* received packet with smallest seqno out of order; add it to front */
+	if (!added)
+		list_add(&new->list, &tp_vars->unacked_list);
+
+out:
+	spin_unlock_bh(&tp_vars->unacked_lock);
+
+	return true;
+}
+
+/**
+ * batadv_tp_ack_unordered - update number received bytes in current stream
+ *  without gaps
+ * @tp_vars: the private data of the current TP meter session
+ */
+static void batadv_tp_ack_unordered(struct batadv_tp_vars *tp_vars)
+{
+	struct batadv_tp_unacked *un, *safe;
+	u32 to_ack;
+
+	/* go through the unacked packet list and possibly ACK them as
+	 * well
+	 */
+	spin_lock_bh(&tp_vars->unacked_lock);
+	list_for_each_entry_safe(un, safe, &tp_vars->unacked_list, list) {
+		/* the list is ordered, therefore it is possible to stop as soon
+		 * there is a gap between the last acked seqno and the seqno of
+		 * the packet under inspection
+		 */
+		if (batadv_seq_before(tp_vars->last_recv, un->seqno))
+			break;
+
+		to_ack = un->seqno + un->len - tp_vars->last_recv;
+
+		if (batadv_seq_before(tp_vars->last_recv, un->seqno + un->len))
+			tp_vars->last_recv += to_ack;
+
+		list_del(&un->list);
+		kfree(un);
+	}
+	spin_unlock_bh(&tp_vars->unacked_lock);
+}
+
+/**
+ * batadv_tp_init_recv - return matching or create new receiver tp_vars
+ * @bat_priv: the bat priv with all the soft interface information
+ * @icmp: received icmp tp msg
+ *
+ * Return: corresponding tp_vars or NULL on errors
+ */
+static struct batadv_tp_vars *
+batadv_tp_init_recv(struct batadv_priv *bat_priv,
+		    const struct batadv_icmp_tp_packet *icmp)
+{
+	struct batadv_tp_vars *tp_vars;
+
+	spin_lock_bh(&bat_priv->tp_list_lock);
+	tp_vars = batadv_tp_list_find_session(bat_priv, icmp->orig,
+					      icmp->session);
+	if (tp_vars)
+		goto out_unlock;
+
+	if (!atomic_add_unless(&bat_priv->tp_num, 1, BATADV_TP_MAX_NUM)) {
+		batadv_dbg(BATADV_DBG_TP_METER, bat_priv,
+			   "Meter: too many ongoing sessions, aborting (RECV)\n");
+		goto out_unlock;
+	}
+
+	tp_vars = kmalloc(sizeof(*tp_vars), GFP_ATOMIC);
+	if (!tp_vars)
+		goto out_unlock;
+
+	ether_addr_copy(tp_vars->other_end, icmp->orig);
+	tp_vars->role = BATADV_TP_RECEIVER;
+	memcpy(tp_vars->session, icmp->session, sizeof(tp_vars->session));
+	tp_vars->last_recv = BATADV_TP_FIRST_SEQ;
+	tp_vars->bat_priv = bat_priv;
+	kref_init(&tp_vars->refcount);
+
+	spin_lock_init(&tp_vars->unacked_lock);
+	INIT_LIST_HEAD(&tp_vars->unacked_list);
+
+	kref_get(&tp_vars->refcount);
+	hlist_add_head_rcu(&tp_vars->list, &bat_priv->tp_list);
+
+	kref_get(&tp_vars->refcount);
+	setup_timer(&tp_vars->timer, batadv_tp_receiver_shutdown,
+		    (unsigned long)tp_vars);
+
+	batadv_tp_reset_receiver_timer(tp_vars);
+
+out_unlock:
+	spin_unlock_bh(&bat_priv->tp_list_lock);
+
+	return tp_vars;
+}
+
+/**
+ * batadv_tp_recv_msg - process a single data message
+ * @bat_priv: the bat priv with all the soft interface information
+ * @skb: the buffer containing the received packet
+ *
+ * Process a received TP MSG packet
+ */
+static void batadv_tp_recv_msg(struct batadv_priv *bat_priv,
+			       const struct sk_buff *skb)
+{
+	const struct batadv_icmp_tp_packet *icmp;
+	struct batadv_tp_vars *tp_vars;
+	size_t packet_size;
+	u32 seqno;
+
+	icmp = (struct batadv_icmp_tp_packet *)skb->data;
+
+	seqno = ntohl(icmp->seqno);
+	/* check if this is the first seqno. This means that if the
+	 * first packet is lost, the tp meter does not work anymore!
+	 */
+	if (seqno == BATADV_TP_FIRST_SEQ) {
+		tp_vars = batadv_tp_init_recv(bat_priv, icmp);
+		if (!tp_vars) {
+			batadv_dbg(BATADV_DBG_TP_METER, bat_priv,
+				   "Meter: seqno != BATADV_TP_FIRST_SEQ cannot initiate connection\n");
+			goto out;
+		}
+	} else {
+		tp_vars = batadv_tp_list_find_session(bat_priv, icmp->orig,
+						      icmp->session);
+		if (!tp_vars) {
+			batadv_dbg(BATADV_DBG_TP_METER, bat_priv,
+				   "Unexpected packet from %pM!\n",
+				   icmp->orig);
+			goto out;
+		}
+	}
+
+	if (unlikely(tp_vars->role != BATADV_TP_RECEIVER)) {
+		batadv_dbg(BATADV_DBG_TP_METER, bat_priv,
+			   "Meter: dropping packet: not expected (role=%u)\n",
+			   tp_vars->role);
+		goto out;
+	}
+
+	tp_vars->last_recv_time = jiffies;
+
+	/* if the packet is a duplicate, it may be the case that an ACK has been
+	 * lost. Resend the ACK
+	 */
+	if (batadv_seq_before(seqno, tp_vars->last_recv))
+		goto send_ack;
+
+	/* if the packet is out of order enqueue it */
+	if (ntohl(icmp->seqno) != tp_vars->last_recv) {
+		/* exit immediately (and do not send any ACK) if the packet has
+		 * not been enqueued correctly
+		 */
+		if (!batadv_tp_handle_out_of_order(tp_vars, skb))
+			goto out;
+
+		/* send a duplicate ACK */
+		goto send_ack;
+	}
+
+	/* if everything was fine count the ACKed bytes */
+	packet_size = skb->len - sizeof(struct batadv_unicast_packet);
+	tp_vars->last_recv += packet_size;
+
+	/* check if this ordered message filled a gap.... */
+	batadv_tp_ack_unordered(tp_vars);
+
+send_ack:
+	/* send the ACK. If the received packet was out of order, the ACK that
+	 * is going to be sent is a duplicate (the sender will count them and
+	 * possibly enter Fast Retransmit as soon as it has reached 3)
+	 */
+	batadv_tp_send_ack(bat_priv, icmp->orig, tp_vars->last_recv,
+			   icmp->timestamp, icmp->session, icmp->uid);
+out:
+	if (likely(tp_vars))
+		batadv_tp_vars_put(tp_vars);
+}
+
+/**
+ * batadv_tp_meter_recv - main TP Meter receiving function
+ * @bat_priv: the bat priv with all the soft interface information
+ * @skb: the buffer containing the received packet
+ */
+void batadv_tp_meter_recv(struct batadv_priv *bat_priv, struct sk_buff *skb)
+{
+	struct batadv_icmp_tp_packet *icmp;
+
+	icmp = (struct batadv_icmp_tp_packet *)skb->data;
+
+	switch (icmp->subtype) {
+	case BATADV_TP_MSG:
+		batadv_tp_recv_msg(bat_priv, skb);
+		break;
+	case BATADV_TP_ACK:
+		batadv_tp_recv_ack(bat_priv, skb);
+		break;
+	default:
+		batadv_dbg(BATADV_DBG_TP_METER, bat_priv,
+			   "Received unknown TP Metric packet type %u\n",
+			   icmp->subtype);
+	}
+	consume_skb(skb);
+}
+
+/**
+ * batadv_tp_meter_init - initialize global tp_meter structures
+ */
+void batadv_tp_meter_init(void)
+{
+	get_random_bytes(batadv_tp_prerandom, sizeof(batadv_tp_prerandom));
+}

net/batman-adv/tp_meter.h

+/* Copyright (C) 2012-2016 B.A.T.M.A.N. contributors:
+ *
+ * Edo Monticelli, Antonio Quartulli
+ *
+ * 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/>.
+ */
+
+#ifndef _NET_BATMAN_ADV_TP_METER_H_
+#define _NET_BATMAN_ADV_TP_METER_H_
+
+#include "main.h"
+
+#include <linux/types.h>
+
+struct sk_buff;
+
+void batadv_tp_meter_init(void);
+void batadv_tp_start(struct batadv_priv *bat_priv, const u8 *dst,
+		     u32 test_length, u32 *cookie);
+void batadv_tp_stop(struct batadv_priv *bat_priv, const u8 *dst,
+		    u8 return_value);
+void batadv_tp_meter_recv(struct batadv_priv *bat_priv, struct sk_buff *skb);
+
+#endif /* _NET_BATMAN_ADV_TP_METER_H_ */

net/batman-adv/translation-table.c

@@ -47,10 +47,12 @@
 #include "bridge_loop_avoidance.h"
 #include "hard-interface.h"
 #include "hash.h"
+#include "log.h"
 #include "multicast.h"
 #include "originator.h"
 #include "packet.h"
 #include "soft-interface.h"
+#include "tvlv.h"
 
 /* hash class keys */
 static struct lock_class_key batadv_tt_local_hash_lock_class_key;
@@ -1545,7 +1547,7 @@ batadv_transtable_best_orig(struct batadv_priv *bat_priv,
 			    struct batadv_tt_global_entry *tt_global_entry)
 {
 	struct batadv_neigh_node *router, *best_router = NULL;
-	struct batadv_algo_ops *bao = bat_priv->bat_algo_ops;
+	struct batadv_algo_ops *bao = bat_priv->algo_ops;
 	struct hlist_head *head;
 	struct batadv_tt_orig_list_entry *orig_entry, *best_entry = NULL;
 
@@ -1557,8 +1559,8 @@ batadv_transtable_best_orig(struct batadv_priv *bat_priv,
 			continue;
 
 		if (best_router &&
-		    bao->bat_neigh_cmp(router, BATADV_IF_DEFAULT,
-				       best_router, BATADV_IF_DEFAULT) <= 0) {
+		    bao->neigh.cmp(router, BATADV_IF_DEFAULT, best_router,
+				   BATADV_IF_DEFAULT) <= 0) {
 			batadv_neigh_node_put(router);
 			continue;
 		}

net/batman-adv/tvlv.c

+/* Copyright (C) 2007-2016  B.A.T.M.A.N. contributors:
+ *
+ * Marek Lindner, Simon Wunderlich
+ *
+ * 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 "main.h"
+
+#include <linux/byteorder/generic.h>
+#include <linux/etherdevice.h>
+#include <linux/fs.h>
+#include <linux/if_ether.h>
+#include <linux/kernel.h>
+#include <linux/kref.h>
+#include <linux/list.h>
+#include <linux/lockdep.h>
+#include <linux/netdevice.h>
+#include <linux/pkt_sched.h>
+#include <linux/rculist.h>
+#include <linux/rcupdate.h>
+#include <linux/skbuff.h>
+#include <linux/slab.h>
+#include <linux/spinlock.h>
+#include <linux/stddef.h>
+#include <linux/string.h>
+#include <linux/types.h>
+
+#include "originator.h"
+#include "packet.h"
+#include "send.h"
+#include "tvlv.h"
+
+/**
+ * batadv_tvlv_handler_release - release tvlv handler from lists and queue for
+ *  free after rcu grace period
+ * @ref: kref pointer of the tvlv
+ */
+static void batadv_tvlv_handler_release(struct kref *ref)
+{
+	struct batadv_tvlv_handler *tvlv_handler;
+
+	tvlv_handler = container_of(ref, struct batadv_tvlv_handler, refcount);
+	kfree_rcu(tvlv_handler, rcu);
+}
+
+/**
+ * batadv_tvlv_handler_put - decrement the tvlv container refcounter and
+ *  possibly release it
+ * @tvlv_handler: the tvlv handler to free
+ */
+static void batadv_tvlv_handler_put(struct batadv_tvlv_handler *tvlv_handler)
+{
+	kref_put(&tvlv_handler->refcount, batadv_tvlv_handler_release);
+}
+
+/**
+ * batadv_tvlv_handler_get - retrieve tvlv handler from the tvlv handler list
+ *  based on the provided type and version (both need to match)
+ * @bat_priv: the bat priv with all the soft interface information
+ * @type: tvlv handler type to look for
+ * @version: tvlv handler version to look for
+ *
+ * Return: tvlv handler if found or NULL otherwise.
+ */
+static struct batadv_tvlv_handler *
+batadv_tvlv_handler_get(struct batadv_priv *bat_priv, u8 type, u8 version)
+{
+	struct batadv_tvlv_handler *tvlv_handler_tmp, *tvlv_handler = NULL;
+
+	rcu_read_lock();
+	hlist_for_each_entry_rcu(tvlv_handler_tmp,
+				 &bat_priv->tvlv.handler_list, list) {
+		if (tvlv_handler_tmp->type != type)
+			continue;
+
+		if (tvlv_handler_tmp->version != version)
+			continue;
+
+		if (!kref_get_unless_zero(&tvlv_handler_tmp->refcount))
+			continue;
+
+		tvlv_handler = tvlv_handler_tmp;
+		break;
+	}
+	rcu_read_unlock();
+
+	return tvlv_handler;
+}
+
+/**
+ * batadv_tvlv_container_release - release tvlv from lists and free
+ * @ref: kref pointer of the tvlv
+ */
+static void batadv_tvlv_container_release(struct kref *ref)
+{
+	struct batadv_tvlv_container *tvlv;
+
+	tvlv = container_of(ref, struct batadv_tvlv_container, refcount);
+	kfree(tvlv);
+}
+
+/**
+ * batadv_tvlv_container_put - decrement the tvlv container refcounter and
+ *  possibly release it
+ * @tvlv: the tvlv container to free
+ */
+static void batadv_tvlv_container_put(struct batadv_tvlv_container *tvlv)
+{
+	kref_put(&tvlv->refcount, batadv_tvlv_container_release);
+}
+
+/**
+ * batadv_tvlv_container_get - retrieve tvlv container from the tvlv container
+ *  list based on the provided type and version (both need to match)
+ * @bat_priv: the bat priv with all the soft interface information
+ * @type: tvlv container type to look for
+ * @version: tvlv container version to look for
+ *
+ * Has to be called with the appropriate locks being acquired
+ * (tvlv.container_list_lock).
+ *
+ * Return: tvlv container if found or NULL otherwise.
+ */
+static struct batadv_tvlv_container *
+batadv_tvlv_container_get(struct batadv_priv *bat_priv, u8 type, u8 version)
+{
+	struct batadv_tvlv_container *tvlv_tmp, *tvlv = NULL;
+
+	lockdep_assert_held(&bat_priv->tvlv.container_list_lock);
+
+	hlist_for_each_entry(tvlv_tmp, &bat_priv->tvlv.container_list, list) {
+		if (tvlv_tmp->tvlv_hdr.type != type)
+			continue;
+
+		if (tvlv_tmp->tvlv_hdr.version != version)
+			continue;
+
+		kref_get(&tvlv_tmp->refcount);
+		tvlv = tvlv_tmp;
+		break;
+	}
+
+	return tvlv;
+}
+
+/**
+ * batadv_tvlv_container_list_size - calculate the size of the tvlv container
+ *  list entries
+ * @bat_priv: the bat priv with all the soft interface information
+ *
+ * Has to be called with the appropriate locks being acquired
+ * (tvlv.container_list_lock).
+ *
+ * Return: size of all currently registered tvlv containers in bytes.
+ */
+static u16 batadv_tvlv_container_list_size(struct batadv_priv *bat_priv)
+{
+	struct batadv_tvlv_container *tvlv;
+	u16 tvlv_len = 0;
+
+	lockdep_assert_held(&bat_priv->tvlv.container_list_lock);
+
+	hlist_for_each_entry(tvlv, &bat_priv->tvlv.container_list, list) {
+		tvlv_len += sizeof(struct batadv_tvlv_hdr);
+		tvlv_len += ntohs(tvlv->tvlv_hdr.len);
+	}
+
+	return tvlv_len;
+}
+
+/**
+ * batadv_tvlv_container_remove - remove tvlv container from the tvlv container
+ *  list
+ * @bat_priv: the bat priv with all the soft interface information
+ * @tvlv: the to be removed tvlv container
+ *
+ * Has to be called with the appropriate locks being acquired
+ * (tvlv.container_list_lock).
+ */
+static void batadv_tvlv_container_remove(struct batadv_priv *bat_priv,
+					 struct batadv_tvlv_container *tvlv)
+{
+	lockdep_assert_held(&bat_priv->tvlv.container_list_lock);
+
+	if (!tvlv)
+		return;
+
+	hlist_del(&tvlv->list);
+
+	/* first call to decrement the counter, second call to free */
+	batadv_tvlv_container_put(tvlv);
+	batadv_tvlv_container_put(tvlv);
+}
+
+/**
+ * batadv_tvlv_container_unregister - unregister tvlv container based on the
+ *  provided type and version (both need to match)
+ * @bat_priv: the bat priv with all the soft interface information
+ * @type: tvlv container type to unregister
+ * @version: tvlv container type to unregister
+ */
+void batadv_tvlv_container_unregister(struct batadv_priv *bat_priv,
+				      u8 type, u8 version)
+{
+	struct batadv_tvlv_container *tvlv;
+
+	spin_lock_bh(&bat_priv->tvlv.container_list_lock);
+	tvlv = batadv_tvlv_container_get(bat_priv, type, version);
+	batadv_tvlv_container_remove(bat_priv, tvlv);
+	spin_unlock_bh(&bat_priv->tvlv.container_list_lock);
+}
+
+/**
+ * batadv_tvlv_container_register - register tvlv type, version and content
+ *  to be propagated with each (primary interface) OGM
+ * @bat_priv: the bat priv with all the soft interface information
+ * @type: tvlv container type
+ * @version: tvlv container version
+ * @tvlv_value: tvlv container content
+ * @tvlv_value_len: tvlv container content length
+ *
+ * If a container of the same type and version was already registered the new
+ * content is going to replace the old one.
+ */
+void batadv_tvlv_container_register(struct batadv_priv *bat_priv,
+				    u8 type, u8 version,
+				    void *tvlv_value, u16 tvlv_value_len)
+{
+	struct batadv_tvlv_container *tvlv_old, *tvlv_new;
+
+	if (!tvlv_value)
+		tvlv_value_len = 0;
+
+	tvlv_new = kzalloc(sizeof(*tvlv_new) + tvlv_value_len, GFP_ATOMIC);
+	if (!tvlv_new)
+		return;
+
+	tvlv_new->tvlv_hdr.version = version;
+	tvlv_new->tvlv_hdr.type = type;
+	tvlv_new->tvlv_hdr.len = htons(tvlv_value_len);
+
+	memcpy(tvlv_new + 1, tvlv_value, ntohs(tvlv_new->tvlv_hdr.len));
+	INIT_HLIST_NODE(&tvlv_new->list);
+	kref_init(&tvlv_new->refcount);
+
+	spin_lock_bh(&bat_priv->tvlv.container_list_lock);
+	tvlv_old = batadv_tvlv_container_get(bat_priv, type, version);
+	batadv_tvlv_container_remove(bat_priv, tvlv_old);
+	hlist_add_head(&tvlv_new->list, &bat_priv->tvlv.container_list);
+	spin_unlock_bh(&bat_priv->tvlv.container_list_lock);
+}
+
+/**
+ * batadv_tvlv_realloc_packet_buff - reallocate packet buffer to accommodate
+ *  requested packet size
+ * @packet_buff: packet buffer
+ * @packet_buff_len: packet buffer size
+ * @min_packet_len: requested packet minimum size
+ * @additional_packet_len: requested additional packet size on top of minimum
+ *  size
+ *
+ * Return: true of the packet buffer could be changed to the requested size,
+ * false otherwise.
+ */
+static bool batadv_tvlv_realloc_packet_buff(unsigned char **packet_buff,
+					    int *packet_buff_len,
+					    int min_packet_len,
+					    int additional_packet_len)
+{
+	unsigned char *new_buff;
+
+	new_buff = kmalloc(min_packet_len + additional_packet_len, GFP_ATOMIC);
+
+	/* keep old buffer if kmalloc should fail */
+	if (!new_buff)
+		return false;
+
+	memcpy(new_buff, *packet_buff, min_packet_len);
+	kfree(*packet_buff);
+	*packet_buff = new_buff;
+	*packet_buff_len = min_packet_len + additional_packet_len;
+
+	return true;
+}
+
+/**
+ * batadv_tvlv_container_ogm_append - append tvlv container content to given
+ *  OGM packet buffer
+ * @bat_priv: the bat priv with all the soft interface information
+ * @packet_buff: ogm packet buffer
+ * @packet_buff_len: ogm packet buffer size including ogm header and tvlv
+ *  content
+ * @packet_min_len: ogm header size to be preserved for the OGM itself
+ *
+ * The ogm packet might be enlarged or shrunk depending on the current size
+ * and the size of the to-be-appended tvlv containers.
+ *
+ * Return: size of all appended tvlv containers in bytes.
+ */
+u16 batadv_tvlv_container_ogm_append(struct batadv_priv *bat_priv,
+				     unsigned char **packet_buff,
+				     int *packet_buff_len, int packet_min_len)
+{
+	struct batadv_tvlv_container *tvlv;
+	struct batadv_tvlv_hdr *tvlv_hdr;
+	u16 tvlv_value_len;
+	void *tvlv_value;
+	bool ret;
+
+	spin_lock_bh(&bat_priv->tvlv.container_list_lock);
+	tvlv_value_len = batadv_tvlv_container_list_size(bat_priv);
+
+	ret = batadv_tvlv_realloc_packet_buff(packet_buff, packet_buff_len,
+					      packet_min_len, tvlv_value_len);
+
+	if (!ret)
+		goto end;
+
+	if (!tvlv_value_len)
+		goto end;
+
+	tvlv_value = (*packet_buff) + packet_min_len;
+
+	hlist_for_each_entry(tvlv, &bat_priv->tvlv.container_list, list) {
+		tvlv_hdr = tvlv_value;
+		tvlv_hdr->type = tvlv->tvlv_hdr.type;
+		tvlv_hdr->version = tvlv->tvlv_hdr.version;
+		tvlv_hdr->len = tvlv->tvlv_hdr.len;
+		tvlv_value = tvlv_hdr + 1;
+		memcpy(tvlv_value, tvlv + 1, ntohs(tvlv->tvlv_hdr.len));
+		tvlv_value = (u8 *)tvlv_value + ntohs(tvlv->tvlv_hdr.len);
+	}
+
+end:
+	spin_unlock_bh(&bat_priv->tvlv.container_list_lock);
+	return tvlv_value_len;
+}
+
+/**
+ * batadv_tvlv_call_handler - parse the given tvlv buffer to call the
+ *  appropriate handlers
+ * @bat_priv: the bat priv with all the soft interface information
+ * @tvlv_handler: tvlv callback function handling the tvlv content
+ * @ogm_source: flag indicating whether the tvlv is an ogm or a unicast packet
+ * @orig_node: orig node emitting the ogm packet
+ * @src: source mac address of the unicast packet
+ * @dst: destination mac address of the unicast packet
+ * @tvlv_value: tvlv content
+ * @tvlv_value_len: tvlv content length
+ *
+ * Return: success if handler was not found or the return value of the handler
+ * callback.
+ */
+static int batadv_tvlv_call_handler(struct batadv_priv *bat_priv,
+				    struct batadv_tvlv_handler *tvlv_handler,
+				    bool ogm_source,
+				    struct batadv_orig_node *orig_node,
+				    u8 *src, u8 *dst,
+				    void *tvlv_value, u16 tvlv_value_len)
+{
+	if (!tvlv_handler)
+		return NET_RX_SUCCESS;
+
+	if (ogm_source) {
+		if (!tvlv_handler->ogm_handler)
+			return NET_RX_SUCCESS;
+
+		if (!orig_node)
+			return NET_RX_SUCCESS;
+
+		tvlv_handler->ogm_handler(bat_priv, orig_node,
+					  BATADV_NO_FLAGS,
+					  tvlv_value, tvlv_value_len);
+		tvlv_handler->flags |= BATADV_TVLV_HANDLER_OGM_CALLED;
+	} else {
+		if (!src)
+			return NET_RX_SUCCESS;
+
+		if (!dst)
+			return NET_RX_SUCCESS;
+
+		if (!tvlv_handler->unicast_handler)
+			return NET_RX_SUCCESS;
+
+		return tvlv_handler->unicast_handler(bat_priv, src,
+						     dst, tvlv_value,
+						     tvlv_value_len);
+	}
+
+	return NET_RX_SUCCESS;
+}
+
+/**
+ * batadv_tvlv_containers_process - parse the given tvlv buffer to call the
+ *  appropriate handlers
+ * @bat_priv: the bat priv with all the soft interface information
+ * @ogm_source: flag indicating whether the tvlv is an ogm or a unicast packet
+ * @orig_node: orig node emitting the ogm packet
+ * @src: source mac address of the unicast packet
+ * @dst: destination mac address of the unicast packet
+ * @tvlv_value: tvlv content
+ * @tvlv_value_len: tvlv content length
+ *
+ * Return: success when processing an OGM or the return value of all called
+ * handler callbacks.
+ */
+int batadv_tvlv_containers_process(struct batadv_priv *bat_priv,
+				   bool ogm_source,
+				   struct batadv_orig_node *orig_node,
+				   u8 *src, u8 *dst,
+				   void *tvlv_value, u16 tvlv_value_len)
+{
+	struct batadv_tvlv_handler *tvlv_handler;
+	struct batadv_tvlv_hdr *tvlv_hdr;
+	u16 tvlv_value_cont_len;
+	u8 cifnotfound = BATADV_TVLV_HANDLER_OGM_CIFNOTFND;
+	int ret = NET_RX_SUCCESS;
+
+	while (tvlv_value_len >= sizeof(*tvlv_hdr)) {
+		tvlv_hdr = tvlv_value;
+		tvlv_value_cont_len = ntohs(tvlv_hdr->len);
+		tvlv_value = tvlv_hdr + 1;
+		tvlv_value_len -= sizeof(*tvlv_hdr);
+
+		if (tvlv_value_cont_len > tvlv_value_len)
+			break;
+
+		tvlv_handler = batadv_tvlv_handler_get(bat_priv,
+						       tvlv_hdr->type,
+						       tvlv_hdr->version);
+
+		ret |= batadv_tvlv_call_handler(bat_priv, tvlv_handler,
+						ogm_source, orig_node,
+						src, dst, tvlv_value,
+						tvlv_value_cont_len);
+		if (tvlv_handler)
+			batadv_tvlv_handler_put(tvlv_handler);
+		tvlv_value = (u8 *)tvlv_value + tvlv_value_cont_len;
+		tvlv_value_len -= tvlv_value_cont_len;
+	}
+
+	if (!ogm_source)
+		return ret;
+
+	rcu_read_lock();
+	hlist_for_each_entry_rcu(tvlv_handler,
+				 &bat_priv->tvlv.handler_list, list) {
+		if ((tvlv_handler->flags & BATADV_TVLV_HANDLER_OGM_CIFNOTFND) &&
+		    !(tvlv_handler->flags & BATADV_TVLV_HANDLER_OGM_CALLED))
+			tvlv_handler->ogm_handler(bat_priv, orig_node,
+						  cifnotfound, NULL, 0);
+
+		tvlv_handler->flags &= ~BATADV_TVLV_HANDLER_OGM_CALLED;
+	}
+	rcu_read_unlock();
+
+	return NET_RX_SUCCESS;
+}
+
+/**
+ * batadv_tvlv_ogm_receive - process an incoming ogm and call the appropriate
+ *  handlers
+ * @bat_priv: the bat priv with all the soft interface information
+ * @batadv_ogm_packet: ogm packet containing the tvlv containers
+ * @orig_node: orig node emitting the ogm packet
+ */
+void batadv_tvlv_ogm_receive(struct batadv_priv *bat_priv,
+			     struct batadv_ogm_packet *batadv_ogm_packet,
+			     struct batadv_orig_node *orig_node)
+{
+	void *tvlv_value;
+	u16 tvlv_value_len;
+
+	if (!batadv_ogm_packet)
+		return;
+
+	tvlv_value_len = ntohs(batadv_ogm_packet->tvlv_len);
+	if (!tvlv_value_len)
+		return;
+
+	tvlv_value = batadv_ogm_packet + 1;
+
+	batadv_tvlv_containers_process(bat_priv, true, orig_node, NULL, NULL,
+				       tvlv_value, tvlv_value_len);
+}
+
+/**
+ * batadv_tvlv_handler_register - register tvlv handler based on the provided
+ *  type and version (both need to match) for ogm tvlv payload and/or unicast
+ *  payload
+ * @bat_priv: the bat priv with all the soft interface information
+ * @optr: ogm tvlv handler callback function. This function receives the orig
+ *  node, flags and the tvlv content as argument to process.
+ * @uptr: unicast tvlv handler callback function. This function receives the
+ *  source & destination of the unicast packet as well as the tvlv content
+ *  to process.
+ * @type: tvlv handler type to be registered
+ * @version: tvlv handler version to be registered
+ * @flags: flags to enable or disable TVLV API behavior
+ */
+void batadv_tvlv_handler_register(struct batadv_priv *bat_priv,
+				  void (*optr)(struct batadv_priv *bat_priv,
+					       struct batadv_orig_node *orig,
+					       u8 flags,
+					       void *tvlv_value,
+					       u16 tvlv_value_len),
+				  int (*uptr)(struct batadv_priv *bat_priv,
+					      u8 *src, u8 *dst,
+					      void *tvlv_value,
+					      u16 tvlv_value_len),
+				  u8 type, u8 version, u8 flags)
+{
+	struct batadv_tvlv_handler *tvlv_handler;
+
+	tvlv_handler = batadv_tvlv_handler_get(bat_priv, type, version);
+	if (tvlv_handler) {
+		batadv_tvlv_handler_put(tvlv_handler);
+		return;
+	}
+
+	tvlv_handler = kzalloc(sizeof(*tvlv_handler), GFP_ATOMIC);
+	if (!tvlv_handler)
+		return;
+
+	tvlv_handler->ogm_handler = optr;
+	tvlv_handler->unicast_handler = uptr;
+	tvlv_handler->type = type;
+	tvlv_handler->version = version;
+	tvlv_handler->flags = flags;
+	kref_init(&tvlv_handler->refcount);
+	INIT_HLIST_NODE(&tvlv_handler->list);
+
+	spin_lock_bh(&bat_priv->tvlv.handler_list_lock);
+	hlist_add_head_rcu(&tvlv_handler->list, &bat_priv->tvlv.handler_list);
+	spin_unlock_bh(&bat_priv->tvlv.handler_list_lock);
+}
+
+/**
+ * batadv_tvlv_handler_unregister - unregister tvlv handler based on the
+ *  provided type and version (both need to match)
+ * @bat_priv: the bat priv with all the soft interface information
+ * @type: tvlv handler type to be unregistered
+ * @version: tvlv handler version to be unregistered
+ */
+void batadv_tvlv_handler_unregister(struct batadv_priv *bat_priv,
+				    u8 type, u8 version)
+{
+	struct batadv_tvlv_handler *tvlv_handler;
+
+	tvlv_handler = batadv_tvlv_handler_get(bat_priv, type, version);
+	if (!tvlv_handler)
+		return;
+
+	batadv_tvlv_handler_put(tvlv_handler);
+	spin_lock_bh(&bat_priv->tvlv.handler_list_lock);
+	hlist_del_rcu(&tvlv_handler->list);
+	spin_unlock_bh(&bat_priv->tvlv.handler_list_lock);
+	batadv_tvlv_handler_put(tvlv_handler);
+}
+
+/**
+ * batadv_tvlv_unicast_send - send a unicast packet with tvlv payload to the
+ *  specified host
+ * @bat_priv: the bat priv with all the soft interface information
+ * @src: source mac address of the unicast packet
+ * @dst: destination mac address of the unicast packet
+ * @type: tvlv type
+ * @version: tvlv version
+ * @tvlv_value: tvlv content
+ * @tvlv_value_len: tvlv content length
+ */
+void batadv_tvlv_unicast_send(struct batadv_priv *bat_priv, u8 *src,
+			      u8 *dst, u8 type, u8 version,
+			      void *tvlv_value, u16 tvlv_value_len)
+{
+	struct batadv_unicast_tvlv_packet *unicast_tvlv_packet;
+	struct batadv_tvlv_hdr *tvlv_hdr;
+	struct batadv_orig_node *orig_node;
+	struct sk_buff *skb;
+	unsigned char *tvlv_buff;
+	unsigned int tvlv_len;
+	ssize_t hdr_len = sizeof(*unicast_tvlv_packet);
+	int res;
+
+	orig_node = batadv_orig_hash_find(bat_priv, dst);
+	if (!orig_node)
+		return;
+
+	tvlv_len = sizeof(*tvlv_hdr) + tvlv_value_len;
+
+	skb = netdev_alloc_skb_ip_align(NULL, ETH_HLEN + hdr_len + tvlv_len);
+	if (!skb)
+		goto out;
+
+	skb->priority = TC_PRIO_CONTROL;
+	skb_reserve(skb, ETH_HLEN);
+	tvlv_buff = skb_put(skb, sizeof(*unicast_tvlv_packet) + tvlv_len);
+	unicast_tvlv_packet = (struct batadv_unicast_tvlv_packet *)tvlv_buff;
+	unicast_tvlv_packet->packet_type = BATADV_UNICAST_TVLV;
+	unicast_tvlv_packet->version = BATADV_COMPAT_VERSION;
+	unicast_tvlv_packet->ttl = BATADV_TTL;
+	unicast_tvlv_packet->reserved = 0;
+	unicast_tvlv_packet->tvlv_len = htons(tvlv_len);
+	unicast_tvlv_packet->align = 0;
+	ether_addr_copy(unicast_tvlv_packet->src, src);
+	ether_addr_copy(unicast_tvlv_packet->dst, dst);
+
+	tvlv_buff = (unsigned char *)(unicast_tvlv_packet + 1);
+	tvlv_hdr = (struct batadv_tvlv_hdr *)tvlv_buff;
+	tvlv_hdr->version = version;
+	tvlv_hdr->type = type;
+	tvlv_hdr->len = htons(tvlv_value_len);
+	tvlv_buff += sizeof(*tvlv_hdr);
+	memcpy(tvlv_buff, tvlv_value, tvlv_value_len);
+
+	res = batadv_send_skb_to_orig(skb, orig_node, NULL);
+	if (res == -1)
+		kfree_skb(skb);
+out:
+	batadv_orig_node_put(orig_node);
+}

net/batman-adv/tvlv.h

+/* Copyright (C) 2007-2016  B.A.T.M.A.N. contributors:
+ *
+ * Marek Lindner, Simon Wunderlich
+ *
+ * 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/>.
+ */
+
+#ifndef _NET_BATMAN_ADV_TVLV_H_
+#define _NET_BATMAN_ADV_TVLV_H_
+
+#include "main.h"
+
+#include <linux/types.h>
+
+struct batadv_ogm_packet;
+
+void batadv_tvlv_container_register(struct batadv_priv *bat_priv,
+				    u8 type, u8 version,
+				    void *tvlv_value, u16 tvlv_value_len);
+u16 batadv_tvlv_container_ogm_append(struct batadv_priv *bat_priv,
+				     unsigned char **packet_buff,
+				     int *packet_buff_len, int packet_min_len);
+void batadv_tvlv_ogm_receive(struct batadv_priv *bat_priv,
+			     struct batadv_ogm_packet *batadv_ogm_packet,
+			     struct batadv_orig_node *orig_node);
+void batadv_tvlv_container_unregister(struct batadv_priv *bat_priv,
+				      u8 type, u8 version);
+
+void batadv_tvlv_handler_register(struct batadv_priv *bat_priv,
+				  void (*optr)(struct batadv_priv *bat_priv,
+					       struct batadv_orig_node *orig,
+					       u8 flags,
+					       void *tvlv_value,
+					       u16 tvlv_value_len),
+				  int (*uptr)(struct batadv_priv *bat_priv,
+					      u8 *src, u8 *dst,
+					      void *tvlv_value,
+					      u16 tvlv_value_len),
+				  u8 type, u8 version, u8 flags);
+void batadv_tvlv_handler_unregister(struct batadv_priv *bat_priv,
+				    u8 type, u8 version);
+int batadv_tvlv_containers_process(struct batadv_priv *bat_priv,
+				   bool ogm_source,
+				   struct batadv_orig_node *orig_node,
+				   u8 *src, u8 *dst,
+				   void *tvlv_buff, u16 tvlv_buff_len);
+void batadv_tvlv_unicast_send(struct batadv_priv *bat_priv, u8 *src,
+			      u8 *dst, u8 type, u8 version,
+			      void *tvlv_value, u16 tvlv_value_len);
+
+#endif /* _NET_BATMAN_ADV_TVLV_H_ */

net/batman-adv/types.h

@@ -33,6 +33,7 @@
 #include <linux/types.h>
 #include <linux/wait.h>
 #include <linux/workqueue.h>
+#include <uapi/linux/batman_adv.h>
 
 #include "packet.h"
 
@@ -832,6 +833,111 @@ struct batadv_priv_nc {
 	struct batadv_hashtable *decoding_hash;
 };
 
+/**
+ * struct batadv_tp_unacked - unacked packet meta-information
+ * @seqno: seqno of the unacked packet
+ * @len: length of the packet
+ * @list: list node for batadv_tp_vars::unacked_list
+ *
+ * This struct is supposed to represent a buffer unacked packet. However, since
+ * the purpose of the TP meter is to count the traffic only, there is no need to
+ * store the entire sk_buff, the starting offset and the length are enough
+ */
+struct batadv_tp_unacked {
+	u32 seqno;
+	u16 len;
+	struct list_head list;
+};
+
+/**
+ * enum batadv_tp_meter_role - Modus in tp meter session
+ * @BATADV_TP_RECEIVER: Initialized as receiver
+ * @BATADV_TP_SENDER: Initialized as sender
+ */
+enum batadv_tp_meter_role {
+	BATADV_TP_RECEIVER,
+	BATADV_TP_SENDER
+};
+
+/**
+ * struct batadv_tp_vars - tp meter private variables per session
+ * @list: list node for bat_priv::tp_list
+ * @timer: timer for ack (receiver) and retry (sender)
+ * @bat_priv: pointer to the mesh object
+ * @start_time: start time in jiffies
+ * @other_end: mac address of remote
+ * @role: receiver/sender modi
+ * @sending: sending binary semaphore: 1 if sending, 0 is not
+ * @reason: reason for a stopped session
+ * @finish_work: work item for the finishing procedure
+ * @test_length: test length in milliseconds
+ * @session: TP session identifier
+ * @icmp_uid: local ICMP "socket" index
+ * @dec_cwnd: decimal part of the cwnd used during linear growth
+ * @cwnd: current size of the congestion window
+ * @cwnd_lock: lock do protect @cwnd & @dec_cwnd
+ * @ss_threshold: Slow Start threshold. Once cwnd exceeds this value the
+ *  connection switches to the Congestion Avoidance state
+ * @last_acked: last acked byte
+ * @last_sent: last sent byte, not yet acked
+ * @tot_sent: amount of data sent/ACKed so far
+ * @dup_acks: duplicate ACKs counter
+ * @fast_recovery: true if in Fast Recovery mode
+ * @recover: last sent seqno when entering Fast Recovery
+ * @rto: sender timeout
+ * @srtt: smoothed RTT scaled by 2^3
+ * @rttvar: RTT variation scaled by 2^2
+ * @more_bytes: waiting queue anchor when waiting for more ack/retry timeout
+ * @prerandom_offset: offset inside the prerandom buffer
+ * @prerandom_lock: spinlock protecting access to prerandom_offset
+ * @last_recv: last in-order received packet
+ * @unacked_list: list of unacked packets (meta-info only)
+ * @unacked_lock: protect unacked_list
+ * @last_recv_time: time time (jiffies) a msg was received
+ * @refcount: number of context where the object is used
+ * @rcu: struct used for freeing in an RCU-safe manner
+ */
+struct batadv_tp_vars {
+	struct hlist_node list;
+	struct timer_list timer;
+	struct batadv_priv *bat_priv;
+	unsigned long start_time;
+	u8 other_end[ETH_ALEN];
+	enum batadv_tp_meter_role role;
+	atomic_t sending;
+	enum batadv_tp_meter_reason reason;
+	struct delayed_work finish_work;
+	u32 test_length;
+	u8 session[2];
+	u8 icmp_uid;
+
+	/* sender variables */
+	u16 dec_cwnd;
+	u32 cwnd;
+	spinlock_t cwnd_lock; /* Protects cwnd & dec_cwnd */
+	u32 ss_threshold;
+	atomic_t last_acked;
+	u32 last_sent;
+	atomic64_t tot_sent;
+	atomic_t dup_acks;
+	bool fast_recovery;
+	u32 recover;
+	u32 rto;
+	u32 srtt;
+	u32 rttvar;
+	wait_queue_head_t more_bytes;
+	u32 prerandom_offset;
+	spinlock_t prerandom_lock; /* Protects prerandom_offset */
+
+	/* receiver variables */
+	u32 last_recv;
+	struct list_head unacked_list;
+	spinlock_t unacked_lock; /* Protects unacked_list */
+	unsigned long last_recv_time;
+	struct kref refcount;
+	struct rcu_head rcu;
+};
+
 /**
  * struct batadv_softif_vlan - per VLAN attributes set
  * @bat_priv: pointer to the mesh object
@@ -900,14 +1006,17 @@ struct batadv_priv_bat_v {
  * @debug_dir: dentry for debugfs batman-adv subdirectory
  * @forw_bat_list: list of aggregated OGMs that will be forwarded
  * @forw_bcast_list: list of broadcast packets that will be rebroadcasted
+ * @tp_list: list of tp sessions
+ * @tp_num: number of currently active tp sessions
  * @orig_hash: hash table containing mesh participants (orig nodes)
  * @forw_bat_list_lock: lock protecting forw_bat_list
  * @forw_bcast_list_lock: lock protecting forw_bcast_list
+ * @tp_list_lock: spinlock protecting @tp_list
  * @orig_work: work queue callback item for orig node purging
  * @cleanup_work: work queue callback item for soft-interface deinit
  * @primary_if: one of the hard-interfaces assigned to this mesh interface
  *  becomes the primary interface
- * @bat_algo_ops: routing algorithm used by this mesh interface
+ * @algo_ops: routing algorithm used by this mesh interface
  * @softif_vlan_list: a list of softif_vlan structs, one per VLAN created on top
  *  of the mesh interface represented by this object
  * @softif_vlan_list_lock: lock protecting softif_vlan_list
@@ -956,13 +1065,16 @@ struct batadv_priv {
 	struct dentry *debug_dir;
 	struct hlist_head forw_bat_list;
 	struct hlist_head forw_bcast_list;
+	struct hlist_head tp_list;
 	struct batadv_hashtable *orig_hash;
 	spinlock_t forw_bat_list_lock; /* protects forw_bat_list */
 	spinlock_t forw_bcast_list_lock; /* protects forw_bcast_list */
+	spinlock_t tp_list_lock; /* protects tp_list */
+	atomic_t tp_num;
 	struct delayed_work orig_work;
 	struct work_struct cleanup_work;
 	struct batadv_hard_iface __rcu *primary_if;  /* rcu protected pointer */
-	struct batadv_algo_ops *bat_algo_ops;
+	struct batadv_algo_ops *algo_ops;
 	struct hlist_head softif_vlan_list;
 	spinlock_t softif_vlan_list_lock; /* protects softif_vlan_list */
 #ifdef CONFIG_BATMAN_ADV_BLA
@@ -1277,60 +1389,78 @@ struct batadv_forw_packet {
 	struct batadv_hard_iface *if_outgoing;
 };
 
+/**
+ * struct batadv_algo_iface_ops - mesh algorithm callbacks (interface specific)
+ * @activate: start routing mechanisms when hard-interface is brought up
+ * @enable: init routing info when hard-interface is enabled
+ * @disable: de-init routing info when hard-interface is disabled
+ * @update_mac: (re-)init mac addresses of the protocol information
+ *  belonging to this hard-interface
+ * @primary_set: called when primary interface is selected / changed
+ */
+struct batadv_algo_iface_ops {
+	void (*activate)(struct batadv_hard_iface *hard_iface);
+	int (*enable)(struct batadv_hard_iface *hard_iface);
+	void (*disable)(struct batadv_hard_iface *hard_iface);
+	void (*update_mac)(struct batadv_hard_iface *hard_iface);
+	void (*primary_set)(struct batadv_hard_iface *hard_iface);
+};
+
+/**
+ * struct batadv_algo_neigh_ops - mesh algorithm callbacks (neighbour specific)
+ * @hardif_init: called on creation of single hop entry
+ * @cmp: compare the metrics of two neighbors for their respective outgoing
+ *  interfaces
+ * @is_similar_or_better: check if neigh1 is equally similar or better than
+ *  neigh2 for their respective outgoing interface from the metric prospective
+ * @print: print the single hop neighbor list (optional)
+ */
+struct batadv_algo_neigh_ops {
+	void (*hardif_init)(struct batadv_hardif_neigh_node *neigh);
+	int (*cmp)(struct batadv_neigh_node *neigh1,
+		   struct batadv_hard_iface *if_outgoing1,
+		   struct batadv_neigh_node *neigh2,
+		   struct batadv_hard_iface *if_outgoing2);
+	bool (*is_similar_or_better)(struct batadv_neigh_node *neigh1,
+				     struct batadv_hard_iface *if_outgoing1,
+				     struct batadv_neigh_node *neigh2,
+				     struct batadv_hard_iface *if_outgoing2);
+	void (*print)(struct batadv_priv *priv, struct seq_file *seq);
+};
+
+/**
+ * struct batadv_algo_orig_ops - mesh algorithm callbacks (originator specific)
+ * @free: free the resources allocated by the routing algorithm for an orig_node
+ *  object
+ * @add_if: ask the routing algorithm to apply the needed changes to the
+ *  orig_node due to a new hard-interface being added into the mesh
+ * @del_if: ask the routing algorithm to apply the needed changes to the
+ *  orig_node due to an hard-interface being removed from the mesh
+ * @print: print the originator table (optional)
+ */
+struct batadv_algo_orig_ops {
+	void (*free)(struct batadv_orig_node *orig_node);
+	int (*add_if)(struct batadv_orig_node *orig_node, int max_if_num);
+	int (*del_if)(struct batadv_orig_node *orig_node, int max_if_num,
+		      int del_if_num);
+	void (*print)(struct batadv_priv *priv, struct seq_file *seq,
+		      struct batadv_hard_iface *hard_iface);
+};
+
 /**
  * struct batadv_algo_ops - mesh algorithm callbacks
  * @list: list node for the batadv_algo_list
  * @name: name of the algorithm
- * @bat_iface_activate: start routing mechanisms when hard-interface is brought
- *  up
- * @bat_iface_enable: init routing info when hard-interface is enabled
- * @bat_iface_disable: de-init routing info when hard-interface is disabled
- * @bat_iface_update_mac: (re-)init mac addresses of the protocol information
- *  belonging to this hard-interface
- * @bat_primary_iface_set: called when primary interface is selected / changed
- * @bat_hardif_neigh_init: called on creation of single hop entry
- * @bat_neigh_cmp: compare the metrics of two neighbors for their respective
- *  outgoing interfaces
- * @bat_neigh_is_similar_or_better: check if neigh1 is equally similar or
- *  better than neigh2 for their respective outgoing interface from the metric
- *  prospective
- * @bat_neigh_print: print the single hop neighbor list (optional)
- * @bat_orig_print: print the originator table (optional)
- * @bat_orig_free: free the resources allocated by the routing algorithm for an
- *  orig_node object
- * @bat_orig_add_if: ask the routing algorithm to apply the needed changes to
- *  the orig_node due to a new hard-interface being added into the mesh
- * @bat_orig_del_if: ask the routing algorithm to apply the needed changes to
- *  the orig_node due to an hard-interface being removed from the mesh
+ * @iface: callbacks related to interface handling
+ * @neigh: callbacks related to neighbors handling
+ * @orig: callbacks related to originators handling
  */
 struct batadv_algo_ops {
 	struct hlist_node list;
 	char *name;
-	void (*bat_iface_activate)(struct batadv_hard_iface *hard_iface);
-	int (*bat_iface_enable)(struct batadv_hard_iface *hard_iface);
-	void (*bat_iface_disable)(struct batadv_hard_iface *hard_iface);
-	void (*bat_iface_update_mac)(struct batadv_hard_iface *hard_iface);
-	void (*bat_primary_iface_set)(struct batadv_hard_iface *hard_iface);
-	/* neigh_node handling API */
-	void (*bat_hardif_neigh_init)(struct batadv_hardif_neigh_node *neigh);
-	int (*bat_neigh_cmp)(struct batadv_neigh_node *neigh1,
-			     struct batadv_hard_iface *if_outgoing1,
-			     struct batadv_neigh_node *neigh2,
-			     struct batadv_hard_iface *if_outgoing2);
-	bool (*bat_neigh_is_similar_or_better)
-		(struct batadv_neigh_node *neigh1,
-		 struct batadv_hard_iface *if_outgoing1,
-		 struct batadv_neigh_node *neigh2,
-		 struct batadv_hard_iface *if_outgoing2);
-	void (*bat_neigh_print)(struct batadv_priv *priv, struct seq_file *seq);
-	/* orig_node handling API */
-	void (*bat_orig_print)(struct batadv_priv *priv, struct seq_file *seq,
-			       struct batadv_hard_iface *hard_iface);
-	void (*bat_orig_free)(struct batadv_orig_node *orig_node);
-	int (*bat_orig_add_if)(struct batadv_orig_node *orig_node,
-			       int max_if_num);
-	int (*bat_orig_del_if)(struct batadv_orig_node *orig_node,
-			       int max_if_num, int del_if_num);
+	struct batadv_algo_iface_ops iface;
+	struct batadv_algo_neigh_ops neigh;
+	struct batadv_algo_orig_ops orig;
 };
 
 /**