forked from Minki/linux
batman-adv: B.A.T.M.A.N. V - implement GW selection logic
Since the GW selection logic has been made routing protocol specific it is now possible for B.A.T.M.A.N V to have its own mechanism by providing the API implementation. Implement the GW specific API in the B.A.T.M.A.N. V protocol in order to provide a working GW selection mechanism. Signed-off-by: Antonio Quartulli <a@unstable.cc> Signed-off-by: Sven Eckelmann <sven@narfation.org> Signed-off-by: Marek Lindner <mareklindner@neomailbox.ch> Signed-off-by: Simon Wunderlich <sw@simonwunderlich.de>
This commit is contained in:
Antonio Quartulli
Simon Wunderlich
parent
34d99cfefa
commit
50164d8f50
@ -25,6 +25,7 @@
|
||||
#include <linux/init.h>
|
||||
#include <linux/jiffies.h>
|
||||
#include <linux/kernel.h>
|
||||
#include <linux/kref.h>
|
||||
#include <linux/netdevice.h>
|
||||
#include <linux/rculist.h>
|
||||
#include <linux/rcupdate.h>
|
||||
@ -40,6 +41,7 @@
|
||||
#include "gateway_common.h"
|
||||
#include "hard-interface.h"
|
||||
#include "hash.h"
|
||||
#include "log.h"
|
||||
#include "originator.h"
|
||||
#include "packet.h"
|
||||
|
||||
@ -350,6 +352,213 @@ static ssize_t batadv_v_show_sel_class(struct batadv_priv *bat_priv, char *buff)
|
||||
return sprintf(buff, "%u.%u MBit\n", class / 10, class % 10);
|
||||
}
|
||||
|
||||
/**
|
||||
* batadv_v_gw_throughput_get - retrieve the GW-bandwidth for a given GW
|
||||
* @gw_node: the GW to retrieve the metric for
|
||||
* @bw: the pointer where the metric will be stored. The metric is computed as
|
||||
* the minimum between the GW advertised throughput and the path throughput to
|
||||
* it in the mesh
|
||||
*
|
||||
* Return: 0 on success, -1 on failure
|
||||
*/
|
||||
static int batadv_v_gw_throughput_get(struct batadv_gw_node *gw_node, u32 *bw)
|
||||
{
|
||||
struct batadv_neigh_ifinfo *router_ifinfo = NULL;
|
||||
struct batadv_orig_node *orig_node;
|
||||
struct batadv_neigh_node *router;
|
||||
int ret = -1;
|
||||
|
||||
orig_node = gw_node->orig_node;
|
||||
router = batadv_orig_router_get(orig_node, BATADV_IF_DEFAULT);
|
||||
if (!router)
|
||||
goto out;
|
||||
|
||||
router_ifinfo = batadv_neigh_ifinfo_get(router, BATADV_IF_DEFAULT);
|
||||
if (!router_ifinfo)
|
||||
goto out;
|
||||
|
||||
/* the GW metric is computed as the minimum between the path throughput
|
||||
* to reach the GW itself and the advertised bandwidth.
|
||||
* This gives us an approximation of the effective throughput that the
|
||||
* client can expect via this particular GW node
|
||||
*/
|
||||
*bw = router_ifinfo->bat_v.throughput;
|
||||
*bw = min_t(u32, *bw, gw_node->bandwidth_down);
|
||||
|
||||
ret = 0;
|
||||
out:
|
||||
if (router)
|
||||
batadv_neigh_node_put(router);
|
||||
if (router_ifinfo)
|
||||
batadv_neigh_ifinfo_put(router_ifinfo);
|
||||
|
||||
return ret;
|
||||
}
|
||||
|
||||
/**
|
||||
* batadv_v_gw_get_best_gw_node - retrieve the best GW node
|
||||
* @bat_priv: the bat priv with all the soft interface information
|
||||
*
|
||||
* Return: the GW node having the best GW-metric, NULL if no GW is known
|
||||
*/
|
||||
static struct batadv_gw_node *
|
||||
batadv_v_gw_get_best_gw_node(struct batadv_priv *bat_priv)
|
||||
{
|
||||
struct batadv_gw_node *gw_node, *curr_gw = NULL;
|
||||
u32 max_bw = 0, bw;
|
||||
|
||||
rcu_read_lock();
|
||||
hlist_for_each_entry_rcu(gw_node, &bat_priv->gw.list, list) {
|
||||
if (!kref_get_unless_zero(&gw_node->refcount))
|
||||
continue;
|
||||
|
||||
if (batadv_v_gw_throughput_get(gw_node, &bw) < 0)
|
||||
goto next;
|
||||
|
||||
if (curr_gw && (bw <= max_bw))
|
||||
goto next;
|
||||
|
||||
if (curr_gw)
|
||||
batadv_gw_node_put(curr_gw);
|
||||
|
||||
curr_gw = gw_node;
|
||||
kref_get(&curr_gw->refcount);
|
||||
max_bw = bw;
|
||||
|
||||
next:
|
||||
batadv_gw_node_put(gw_node);
|
||||
}
|
||||
rcu_read_unlock();
|
||||
|
||||
return curr_gw;
|
||||
}
|
||||
|
||||
/**
|
||||
* batadv_v_gw_is_eligible - check if a originator would be selected as GW
|
||||
* @bat_priv: the bat priv with all the soft interface information
|
||||
* @curr_gw_orig: originator representing the currently selected GW
|
||||
* @orig_node: the originator representing the new candidate
|
||||
*
|
||||
* Return: true if orig_node can be selected as current GW, false otherwise
|
||||
*/
|
||||
static bool batadv_v_gw_is_eligible(struct batadv_priv *bat_priv,
|
||||
struct batadv_orig_node *curr_gw_orig,
|
||||
struct batadv_orig_node *orig_node)
|
||||
{
|
||||
struct batadv_gw_node *curr_gw = NULL, *orig_gw = NULL;
|
||||
u32 gw_throughput, orig_throughput, threshold;
|
||||
bool ret = false;
|
||||
|
||||
threshold = atomic_read(&bat_priv->gw.sel_class);
|
||||
|
||||
curr_gw = batadv_gw_node_get(bat_priv, curr_gw_orig);
|
||||
if (!curr_gw) {
|
||||
ret = true;
|
||||
goto out;
|
||||
}
|
||||
|
||||
if (batadv_v_gw_throughput_get(curr_gw, &gw_throughput) < 0) {
|
||||
ret = true;
|
||||
goto out;
|
||||
}
|
||||
|
||||
orig_gw = batadv_gw_node_get(bat_priv, orig_node);
|
||||
if (!orig_node)
|
||||
goto out;
|
||||
|
||||
if (batadv_v_gw_throughput_get(orig_gw, &orig_throughput) < 0)
|
||||
goto out;
|
||||
|
||||
if (orig_throughput < gw_throughput)
|
||||
goto out;
|
||||
|
||||
if ((orig_throughput - gw_throughput) < threshold)
|
||||
goto out;
|
||||
|
||||
batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
|
||||
"Restarting gateway selection: better gateway found (throughput curr: %u, throughput new: %u)\n",
|
||||
gw_throughput, orig_throughput);
|
||||
|
||||
ret = true;
|
||||
out:
|
||||
if (curr_gw)
|
||||
batadv_gw_node_put(curr_gw);
|
||||
if (orig_gw)
|
||||
batadv_gw_node_put(orig_gw);
|
||||
|
||||
return ret;
|
||||
}
|
||||
|
||||
/* fails if orig_node has no router */
|
||||
static int batadv_v_gw_write_buffer_text(struct batadv_priv *bat_priv,
|
||||
struct seq_file *seq,
|
||||
const struct batadv_gw_node *gw_node)
|
||||
{
|
||||
struct batadv_gw_node *curr_gw;
|
||||
struct batadv_neigh_node *router;
|
||||
struct batadv_neigh_ifinfo *router_ifinfo = NULL;
|
||||
int ret = -1;
|
||||
|
||||
router = batadv_orig_router_get(gw_node->orig_node, BATADV_IF_DEFAULT);
|
||||
if (!router)
|
||||
goto out;
|
||||
|
||||
router_ifinfo = batadv_neigh_ifinfo_get(router, BATADV_IF_DEFAULT);
|
||||
if (!router_ifinfo)
|
||||
goto out;
|
||||
|
||||
curr_gw = batadv_gw_get_selected_gw_node(bat_priv);
|
||||
|
||||
seq_printf(seq, "%s %pM (%9u.%1u) %pM [%10s]: %u.%u/%u.%u MBit\n",
|
||||
(curr_gw == gw_node ? "=>" : " "),
|
||||
gw_node->orig_node->orig,
|
||||
router_ifinfo->bat_v.throughput / 10,
|
||||
router_ifinfo->bat_v.throughput % 10, router->addr,
|
||||
router->if_incoming->net_dev->name,
|
||||
gw_node->bandwidth_down / 10,
|
||||
gw_node->bandwidth_down % 10,
|
||||
gw_node->bandwidth_up / 10,
|
||||
gw_node->bandwidth_up % 10);
|
||||
ret = seq_has_overflowed(seq) ? -1 : 0;
|
||||
|
||||
if (curr_gw)
|
||||
batadv_gw_node_put(curr_gw);
|
||||
out:
|
||||
if (router_ifinfo)
|
||||
batadv_neigh_ifinfo_put(router_ifinfo);
|
||||
if (router)
|
||||
batadv_neigh_node_put(router);
|
||||
return ret;
|
||||
}
|
||||
|
||||
/**
|
||||
* batadv_v_gw_print - print the gateway list
|
||||
* @bat_priv: the bat priv with all the soft interface information
|
||||
* @seq: gateway table seq_file struct
|
||||
*/
|
||||
static void batadv_v_gw_print(struct batadv_priv *bat_priv,
|
||||
struct seq_file *seq)
|
||||
{
|
||||
struct batadv_gw_node *gw_node;
|
||||
int gw_count = 0;
|
||||
|
||||
seq_puts(seq,
|
||||
" Gateway ( throughput) Nexthop [outgoingIF]: advertised uplink bandwidth\n");
|
||||
|
||||
rcu_read_lock();
|
||||
hlist_for_each_entry_rcu(gw_node, &bat_priv->gw.list, list) {
|
||||
/* fails if orig_node has no router */
|
||||
if (batadv_v_gw_write_buffer_text(bat_priv, seq, gw_node) < 0)
|
||||
continue;
|
||||
|
||||
gw_count++;
|
||||
}
|
||||
rcu_read_unlock();
|
||||
|
||||
if (gw_count == 0)
|
||||
seq_puts(seq, "No gateways in range ...\n");
|
||||
}
|
||||
|
||||
static struct batadv_algo_ops batadv_batman_v __read_mostly = {
|
||||
.name = "BATMAN_V",
|
||||
.iface = {
|
||||
@ -371,6 +580,9 @@ static struct batadv_algo_ops batadv_batman_v __read_mostly = {
|
||||
.gw = {
|
||||
.store_sel_class = batadv_v_store_sel_class,
|
||||
.show_sel_class = batadv_v_show_sel_class,
|
||||
.get_best_gw_node = batadv_v_gw_get_best_gw_node,
|
||||
.is_eligible = batadv_v_gw_is_eligible,
|
||||
.print = batadv_v_gw_print,
|
||||
},
|
||||
};
|
||||
|
||||
@ -397,7 +609,16 @@ void batadv_v_hardif_init(struct batadv_hard_iface *hard_iface)
|
||||
*/
|
||||
int batadv_v_mesh_init(struct batadv_priv *bat_priv)
|
||||
{
|
||||
return batadv_v_ogm_init(bat_priv);
|
||||
int ret = 0;
|
||||
|
||||
ret = batadv_v_ogm_init(bat_priv);
|
||||
if (ret < 0)
|
||||
return ret;
|
||||
|
||||
/* set default throughput difference threshold to 5Mbps */
|
||||
atomic_set(&bat_priv->gw.sel_class, 50);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
/**
|
||||
|
||||
@ -360,9 +360,8 @@ static void batadv_gw_node_add(struct batadv_priv *bat_priv,
|
||||
*
|
||||
* Return: gateway node if found or NULL otherwise.
|
||||
*/
|
||||
static struct batadv_gw_node *
|
||||
batadv_gw_node_get(struct batadv_priv *bat_priv,
|
||||
struct batadv_orig_node *orig_node)
|
||||
struct batadv_gw_node *batadv_gw_node_get(struct batadv_priv *bat_priv,
|
||||
struct batadv_orig_node *orig_node)
|
||||
{
|
||||
struct batadv_gw_node *gw_node_tmp, *gw_node = NULL;
|
||||
|
||||
|
||||
@ -47,5 +47,7 @@ bool batadv_gw_out_of_range(struct batadv_priv *bat_priv, struct sk_buff *skb);
|
||||
enum batadv_dhcp_recipient
|
||||
batadv_gw_dhcp_recipient_get(struct sk_buff *skb, unsigned int *header_len,
|
||||
u8 *chaddr);
|
||||
struct batadv_gw_node *batadv_gw_node_get(struct batadv_priv *bat_priv,
|
||||
struct batadv_orig_node *orig_node);
|
||||
|
||||
#endif /* _NET_BATMAN_ADV_GATEWAY_CLIENT_H_ */
|
||||
|
||||
Loading…
Reference in New Issue
Block a user