batman-adv: throughput meter implementation

The throughput meter module is a simple, kernel-space replacement for
throughtput measurements tool like iperf and netperf. It is intended to
approximate TCP behaviour.

It is invoked through batctl: the protocol is connection oriented, with
cumulative acknowledgment and a dynamic-size sliding window.

The test *can* be interrupted by batctl. A receiver side timeout avoids
unlimited waitings for sender packets: after one second of inactivity, the
receiver abort the ongoing test.

Based on a prototype from Edo Monticelli <montik@autistici.org>
Signed-off-by: Antonio Quartulli <antonio.quartulli@open-mesh.com>
Signed-off-by: Sven Eckelmann <sven.eckelmann@open-mesh.com>
Signed-off-by: Marek Lindner <mareklindner@neomailbox.ch>
Signed-off-by: Simon Wunderlich <sw@simonwunderlich.de>

include/uapi/linux/batman_adv.h

@@ -20,6 +20,8 @@
 
 #define BATADV_NL_NAME "batadv"
 
+#define BATADV_NL_MCAST_GROUP_TPMETER	"tpmeter"
+
 /**
  * enum batadv_nl_attrs - batman-adv netlink attributes
  *
@@ -32,6 +34,12 @@
  * @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
@@ -46,6 +54,12 @@ enum batadv_nl_attrs {
 	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,
@@ -57,15 +71,44 @@ enum batadv_nl_attrs {
  *
  * @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

@@ -42,5 +42,6 @@ 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/log.h

@@ -51,6 +51,7 @@ static inline void batadv_debug_log_cleanup(struct batadv_priv *bat_priv)
  * @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 {
@@ -61,6 +62,7 @@ enum batadv_dbg_level {
 	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,
 };
 

net/batman-adv/main.c

@@ -64,6 +64,7 @@
 #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,
@@ -89,6 +90,7 @@ static int __init batadv_init(void)
 	batadv_v_init();
 	batadv_iv_init();
 	batadv_nc_init();
+	batadv_tp_meter_init();
 
 	batadv_event_workqueue = create_singlethread_workqueue("bat_events");
 
@@ -142,6 +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);
@@ -160,6 +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)

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,

net/batman-adv/netlink.c

@@ -27,12 +27,14 @@
 #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;
 
@@ -44,6 +46,15 @@ static struct genl_family batadv_netlink_family = {
 	.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 },
@@ -53,6 +64,11 @@ static struct nla_policy batadv_netlink_policy[NUM_BATADV_ATTR] = {
 	[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 },
 };
 
 /**
@@ -163,6 +179,207 @@ batadv_netlink_get_mesh_info(struct sk_buff *skb, struct genl_info *info)
 	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,
@@ -170,6 +387,18 @@ static struct genl_ops batadv_netlink_ops[] = {
 		.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,
+	},
 };
 
 /**
@@ -179,8 +408,9 @@ void __init batadv_netlink_register(void)
 {
 	int ret;
 
-	ret = genl_register_family_with_ops(&batadv_netlink_family,
-					    batadv_netlink_ops);
+	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");
 }

net/batman-adv/netlink.h

@@ -20,7 +20,13 @@
 
 #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/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

@@ -46,6 +46,7 @@
 #include "packet.h"
 #include "send.h"
 #include "soft-interface.h"
+#include "tp_meter.h"
 #include "translation-table.h"
 #include "tvlv.h"
 
@@ -276,6 +277,13 @@ static int batadv_recv_my_icmp_packet(struct batadv_priv *bat_priv,
 		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;

net/batman-adv/soft-interface.c

@@ -842,6 +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/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/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
@@ -900,9 +1006,12 @@ 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
@@ -956,9 +1065,12 @@ 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 */