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batman-adv: Add gateway mesh genl configuration

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The mesh/soft-interface can optimize the handling of DHCP packets. Instead
of flooding them through the whole mesh, it can be forwarded as unicast to
a specific gateway server. The originator which injects the packets in the
mesh has to select (based on sel_class thresholds) a responsible gateway
server. This is done by switching this originator to the gw_mode client.
The servers announce their forwarding bandwidth (download/upload) when the
gw_mode server was selected.

The BATADV_CMD_SET_MESH/BATADV_CMD_GET_MESH commands allow to set/get the
configuration of this feature using the attributes:

* u8 BATADV_ATTR_GW_MODE (0 == off, 1 == client, 2 == server)
* u32 BATADV_ATTR_GW_BANDWIDTH_DOWN (in 100 kbit/s steps)
* u32 BATADV_ATTR_GW_BANDWIDTH_UP (in 100 kbit/s steps)
* u32 BATADV_ATTR_GW_SEL_CLASS

Signed-off-by: Sven Eckelmann <sven@narfation.org>
Signed-off-by: Simon Wunderlich <sw@simonwunderlich.de>
This commit is contained in:
Sven Eckelmann 2018-11-23 13:15:00 +01:00 committed by Simon Wunderlich
parent 3e15b06eb7
commit e2d0d35b5b
7 changed files with 135 additions and 8 deletions
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40
include/uapi/linux/batman_adv.h
View File

@ -139,6 +139,20 @@ enum batadv_mcast_flags_priv {
BATADV_MCAST_FLAGS_QUERIER_IPV6_SHADOWING = (1 << 4),
};
/**
* enum batadv_gw_modes - gateway mode of node
*/
enum batadv_gw_modes {
/** @BATADV_GW_MODE_OFF: gw mode disabled */
BATADV_GW_MODE_OFF,
/** @BATADV_GW_MODE_CLIENT: send DHCP requests to gw servers */
BATADV_GW_MODE_CLIENT,
/** @BATADV_GW_MODE_SERVER: announce itself as gatway server */
BATADV_GW_MODE_SERVER,
};
/**
* enum batadv_nl_attrs - batman-adv netlink attributes
*/
@ -403,6 +417,32 @@ enum batadv_nl_attrs {
*/
BATADV_ATTR_FRAGMENTATION_ENABLED,
/**
* @BATADV_ATTR_GW_BANDWIDTH_DOWN: defines the download bandwidth which
* is propagated by this node if %BATADV_ATTR_GW_BANDWIDTH_MODE was set
* to 'server'.
*/
BATADV_ATTR_GW_BANDWIDTH_DOWN,
/**
* @BATADV_ATTR_GW_BANDWIDTH_UP: defines the upload bandwidth which
* is propagated by this node if %BATADV_ATTR_GW_BANDWIDTH_MODE was set
* to 'server'.
*/
BATADV_ATTR_GW_BANDWIDTH_UP,
/**
* @BATADV_ATTR_GW_MODE: defines the state of the gateway features.
* Possible values are specified in enum batadv_gw_modes
*/
BATADV_ATTR_GW_MODE,
/**
* @BATADV_ATTR_GW_SEL_CLASS: defines the selection criteria this node
* will use to choose a gateway if gw_mode was set to 'client'.
*/
BATADV_ATTR_GW_SEL_CLASS,
/* add attributes above here, update the policy in netlink.c */
/**

1
net/batman-adv/gateway_client.c
View File

@ -47,7 +47,6 @@
#include <uapi/linux/batadv_packet.h>
#include <uapi/linux/batman_adv.h>
#include "gateway_common.h"
#include "hard-interface.h"
#include "log.h"
#include "netlink.h"

1
net/batman-adv/gateway_common.c
View File

@ -28,6 +28,7 @@
#include <linux/stddef.h>
#include <linux/string.h>
#include <uapi/linux/batadv_packet.h>
#include <uapi/linux/batman_adv.h>
#include "gateway_client.h"
#include "log.h"

6
net/batman-adv/gateway_common.h
View File

@ -25,12 +25,6 @@
struct net_device;
enum batadv_gw_modes {
BATADV_GW_MODE_OFF,
BATADV_GW_MODE_CLIENT,
BATADV_GW_MODE_SERVER,
};
/**
* enum batadv_bandwidth_units - bandwidth unit types
*/

92
net/batman-adv/netlink.c
View File

@ -51,6 +51,7 @@
#include "bridge_loop_avoidance.h"
#include "distributed-arp-table.h"
#include "gateway_client.h"
#include "gateway_common.h"
#include "hard-interface.h"
#include "multicast.h"
#include "originator.h"
@ -147,6 +148,10 @@ static const struct nla_policy batadv_netlink_policy[NUM_BATADV_ATTR] = {
[BATADV_ATTR_BRIDGE_LOOP_AVOIDANCE_ENABLED] = { .type = NLA_U8 },
[BATADV_ATTR_DISTRIBUTED_ARP_TABLE_ENABLED] = { .type = NLA_U8 },
[BATADV_ATTR_FRAGMENTATION_ENABLED] = { .type = NLA_U8 },
[BATADV_ATTR_GW_BANDWIDTH_DOWN] = { .type = NLA_U32 },
[BATADV_ATTR_GW_BANDWIDTH_UP] = { .type = NLA_U32 },
[BATADV_ATTR_GW_MODE] = { .type = NLA_U8 },
[BATADV_ATTR_GW_SEL_CLASS] = { .type = NLA_U32 },
};
/**
@ -303,6 +308,28 @@ static int batadv_netlink_mesh_fill(struct sk_buff *msg,
!!atomic_read(&bat_priv->fragmentation)))
goto nla_put_failure;
if (nla_put_u32(msg, BATADV_ATTR_GW_BANDWIDTH_DOWN,
atomic_read(&bat_priv->gw.bandwidth_down)))
goto nla_put_failure;
if (nla_put_u32(msg, BATADV_ATTR_GW_BANDWIDTH_UP,
atomic_read(&bat_priv->gw.bandwidth_up)))
goto nla_put_failure;
if (nla_put_u8(msg, BATADV_ATTR_GW_MODE,
atomic_read(&bat_priv->gw.mode)))
goto nla_put_failure;
if (bat_priv->algo_ops->gw.get_best_gw_node &&
bat_priv->algo_ops->gw.is_eligible) {
/* GW selection class is not available if the routing algorithm
* in use does not implement the GW API
*/
if (nla_put_u32(msg, BATADV_ATTR_GW_SEL_CLASS,
atomic_read(&bat_priv->gw.sel_class)))
goto nla_put_failure;
}
if (primary_if)
batadv_hardif_put(primary_if);
@ -444,6 +471,71 @@ static int batadv_netlink_set_mesh(struct sk_buff *skb, struct genl_info *info)
batadv_update_min_mtu(bat_priv->soft_iface);
}
if (info->attrs[BATADV_ATTR_GW_BANDWIDTH_DOWN]) {
attr = info->attrs[BATADV_ATTR_GW_BANDWIDTH_DOWN];
atomic_set(&bat_priv->gw.bandwidth_down, nla_get_u32(attr));
batadv_gw_tvlv_container_update(bat_priv);
}
if (info->attrs[BATADV_ATTR_GW_BANDWIDTH_UP]) {
attr = info->attrs[BATADV_ATTR_GW_BANDWIDTH_UP];
atomic_set(&bat_priv->gw.bandwidth_up, nla_get_u32(attr));
batadv_gw_tvlv_container_update(bat_priv);
}
if (info->attrs[BATADV_ATTR_GW_MODE]) {
u8 gw_mode;
attr = info->attrs[BATADV_ATTR_GW_MODE];
gw_mode = nla_get_u8(attr);
if (gw_mode <= BATADV_GW_MODE_SERVER) {
/* Invoking batadv_gw_reselect() is not enough to really
* de-select the current GW. It will only instruct the
* gateway client code to perform a re-election the next
* time that this is needed.
*
* When gw client mode is being switched off the current
* GW must be de-selected explicitly otherwise no GW_ADD
* uevent is thrown on client mode re-activation. This
* is operation is performed in
* batadv_gw_check_client_stop().
*/
batadv_gw_reselect(bat_priv);
/* always call batadv_gw_check_client_stop() before
* changing the gateway state
*/
batadv_gw_check_client_stop(bat_priv);
atomic_set(&bat_priv->gw.mode, gw_mode);
batadv_gw_tvlv_container_update(bat_priv);
}
}
if (info->attrs[BATADV_ATTR_GW_SEL_CLASS] &&
bat_priv->algo_ops->gw.get_best_gw_node &&
bat_priv->algo_ops->gw.is_eligible) {
/* setting the GW selection class is allowed only if the routing
* algorithm in use implements the GW API
*/
u32 sel_class_max = 0xffffffffu;
u32 sel_class;
attr = info->attrs[BATADV_ATTR_GW_SEL_CLASS];
sel_class = nla_get_u32(attr);
if (!bat_priv->algo_ops->gw.store_sel_class)
sel_class_max = BATADV_TQ_MAX_VALUE;
if (sel_class >= 1 && sel_class <= sel_class_max) {
atomic_set(&bat_priv->gw.sel_class, sel_class);
batadv_gw_reselect(bat_priv);
}
}
batadv_netlink_notify_mesh(bat_priv);
return 0;

2
net/batman-adv/soft-interface.c
View File

@ -50,13 +50,13 @@
#include <linux/string.h>
#include <linux/types.h>
#include <uapi/linux/batadv_packet.h>
#include <uapi/linux/batman_adv.h>
#include "bat_algo.h"
#include "bridge_loop_avoidance.h"
#include "debugfs.h"
#include "distributed-arp-table.h"
#include "gateway_client.h"
#include "gateway_common.h"
#include "hard-interface.h"
#include "multicast.h"
#include "network-coding.h"

1
net/batman-adv/sysfs.c
View File

@ -40,6 +40,7 @@
#include <linux/stringify.h>
#include <linux/workqueue.h>
#include <uapi/linux/batadv_packet.h>
#include <uapi/linux/batman_adv.h>
#include "bridge_loop_avoidance.h"
#include "distributed-arp-table.h"