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
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@ -25,6 +25,7 @@
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#include <linux/init.h>
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#include <linux/jiffies.h>
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#include <linux/kernel.h>
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#include <linux/kref.h>
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#include <linux/netdevice.h>
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#include <linux/rculist.h>
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#include <linux/rcupdate.h>
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@ -40,6 +41,7 @@
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#include "gateway_common.h"
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#include "hard-interface.h"
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#include "hash.h"
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#include "log.h"
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#include "originator.h"
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#include "packet.h"
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@ -350,6 +352,213 @@ static ssize_t batadv_v_show_sel_class(struct batadv_priv *bat_priv, char *buff)
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return sprintf(buff, "%u.%u MBit\n", class / 10, class % 10);
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}
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/**
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* batadv_v_gw_throughput_get - retrieve the GW-bandwidth for a given GW
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* @gw_node: the GW to retrieve the metric for
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* @bw: the pointer where the metric will be stored. The metric is computed as
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* the minimum between the GW advertised throughput and the path throughput to
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* it in the mesh
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*
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* Return: 0 on success, -1 on failure
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*/
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static int batadv_v_gw_throughput_get(struct batadv_gw_node *gw_node, u32 *bw)
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{
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struct batadv_neigh_ifinfo *router_ifinfo = NULL;
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struct batadv_orig_node *orig_node;
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struct batadv_neigh_node *router;
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int ret = -1;
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orig_node = gw_node->orig_node;
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router = batadv_orig_router_get(orig_node, BATADV_IF_DEFAULT);
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if (!router)
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goto out;
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router_ifinfo = batadv_neigh_ifinfo_get(router, BATADV_IF_DEFAULT);
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if (!router_ifinfo)
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goto out;
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/* the GW metric is computed as the minimum between the path throughput
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* to reach the GW itself and the advertised bandwidth.
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* This gives us an approximation of the effective throughput that the
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* client can expect via this particular GW node
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*/
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*bw = router_ifinfo->bat_v.throughput;
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*bw = min_t(u32, *bw, gw_node->bandwidth_down);
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ret = 0;
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out:
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if (router)
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batadv_neigh_node_put(router);
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if (router_ifinfo)
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batadv_neigh_ifinfo_put(router_ifinfo);
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return ret;
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}
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/**
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* batadv_v_gw_get_best_gw_node - retrieve the best GW node
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* @bat_priv: the bat priv with all the soft interface information
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*
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* Return: the GW node having the best GW-metric, NULL if no GW is known
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*/
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static struct batadv_gw_node *
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batadv_v_gw_get_best_gw_node(struct batadv_priv *bat_priv)
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{
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struct batadv_gw_node *gw_node, *curr_gw = NULL;
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u32 max_bw = 0, bw;
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rcu_read_lock();
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hlist_for_each_entry_rcu(gw_node, &bat_priv->gw.list, list) {
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if (!kref_get_unless_zero(&gw_node->refcount))
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continue;
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if (batadv_v_gw_throughput_get(gw_node, &bw) < 0)
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goto next;
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if (curr_gw && (bw <= max_bw))
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goto next;
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if (curr_gw)
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batadv_gw_node_put(curr_gw);
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curr_gw = gw_node;
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kref_get(&curr_gw->refcount);
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max_bw = bw;
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next:
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batadv_gw_node_put(gw_node);
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}
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rcu_read_unlock();
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return curr_gw;
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}
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/**
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* batadv_v_gw_is_eligible - check if a originator would be selected as GW
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* @bat_priv: the bat priv with all the soft interface information
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* @curr_gw_orig: originator representing the currently selected GW
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* @orig_node: the originator representing the new candidate
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*
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* Return: true if orig_node can be selected as current GW, false otherwise
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*/
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static bool batadv_v_gw_is_eligible(struct batadv_priv *bat_priv,
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struct batadv_orig_node *curr_gw_orig,
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struct batadv_orig_node *orig_node)
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{
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struct batadv_gw_node *curr_gw = NULL, *orig_gw = NULL;
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u32 gw_throughput, orig_throughput, threshold;
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bool ret = false;
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threshold = atomic_read(&bat_priv->gw.sel_class);
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curr_gw = batadv_gw_node_get(bat_priv, curr_gw_orig);
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if (!curr_gw) {
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ret = true;
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goto out;
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}
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if (batadv_v_gw_throughput_get(curr_gw, &gw_throughput) < 0) {
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ret = true;
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goto out;
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}
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orig_gw = batadv_gw_node_get(bat_priv, orig_node);
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if (!orig_node)
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goto out;
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if (batadv_v_gw_throughput_get(orig_gw, &orig_throughput) < 0)
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goto out;
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if (orig_throughput < gw_throughput)
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goto out;
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if ((orig_throughput - gw_throughput) < threshold)
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goto out;
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batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
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"Restarting gateway selection: better gateway found (throughput curr: %u, throughput new: %u)\n",
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gw_throughput, orig_throughput);
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ret = true;
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out:
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if (curr_gw)
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batadv_gw_node_put(curr_gw);
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if (orig_gw)
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batadv_gw_node_put(orig_gw);
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return ret;
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}
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/* fails if orig_node has no router */
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static int batadv_v_gw_write_buffer_text(struct batadv_priv *bat_priv,
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struct seq_file *seq,
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const struct batadv_gw_node *gw_node)
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{
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struct batadv_gw_node *curr_gw;
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struct batadv_neigh_node *router;
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struct batadv_neigh_ifinfo *router_ifinfo = NULL;
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int ret = -1;
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router = batadv_orig_router_get(gw_node->orig_node, BATADV_IF_DEFAULT);
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if (!router)
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goto out;
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router_ifinfo = batadv_neigh_ifinfo_get(router, BATADV_IF_DEFAULT);
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if (!router_ifinfo)
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goto out;
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curr_gw = batadv_gw_get_selected_gw_node(bat_priv);
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seq_printf(seq, "%s %pM (%9u.%1u) %pM [%10s]: %u.%u/%u.%u MBit\n",
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(curr_gw == gw_node ? "=>" : " "),
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gw_node->orig_node->orig,
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router_ifinfo->bat_v.throughput / 10,
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router_ifinfo->bat_v.throughput % 10, router->addr,
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router->if_incoming->net_dev->name,
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gw_node->bandwidth_down / 10,
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gw_node->bandwidth_down % 10,
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gw_node->bandwidth_up / 10,
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gw_node->bandwidth_up % 10);
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ret = seq_has_overflowed(seq) ? -1 : 0;
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if (curr_gw)
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batadv_gw_node_put(curr_gw);
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out:
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if (router_ifinfo)
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batadv_neigh_ifinfo_put(router_ifinfo);
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if (router)
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batadv_neigh_node_put(router);
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return ret;
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}
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/**
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* batadv_v_gw_print - print the gateway list
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* @bat_priv: the bat priv with all the soft interface information
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* @seq: gateway table seq_file struct
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*/
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static void batadv_v_gw_print(struct batadv_priv *bat_priv,
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struct seq_file *seq)
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{
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struct batadv_gw_node *gw_node;
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int gw_count = 0;
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seq_puts(seq,
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" Gateway ( throughput) Nexthop [outgoingIF]: advertised uplink bandwidth\n");
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rcu_read_lock();
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hlist_for_each_entry_rcu(gw_node, &bat_priv->gw.list, list) {
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/* fails if orig_node has no router */
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if (batadv_v_gw_write_buffer_text(bat_priv, seq, gw_node) < 0)
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continue;
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gw_count++;
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}
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rcu_read_unlock();
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if (gw_count == 0)
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seq_puts(seq, "No gateways in range ...\n");
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}
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static struct batadv_algo_ops batadv_batman_v __read_mostly = {
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.name = "BATMAN_V",
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.iface = {
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@ -371,6 +580,9 @@ static struct batadv_algo_ops batadv_batman_v __read_mostly = {
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.gw = {
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.store_sel_class = batadv_v_store_sel_class,
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.show_sel_class = batadv_v_show_sel_class,
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.get_best_gw_node = batadv_v_gw_get_best_gw_node,
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.is_eligible = batadv_v_gw_is_eligible,
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.print = batadv_v_gw_print,
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},
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};
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@ -397,7 +609,16 @@ void batadv_v_hardif_init(struct batadv_hard_iface *hard_iface)
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*/
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int batadv_v_mesh_init(struct batadv_priv *bat_priv)
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{
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return batadv_v_ogm_init(bat_priv);
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int ret = 0;
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ret = batadv_v_ogm_init(bat_priv);
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if (ret < 0)
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return ret;
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/* set default throughput difference threshold to 5Mbps */
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atomic_set(&bat_priv->gw.sel_class, 50);
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return 0;
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}
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/**
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@ -360,9 +360,8 @@ static void batadv_gw_node_add(struct batadv_priv *bat_priv,
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*
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* Return: gateway node if found or NULL otherwise.
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*/
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static struct batadv_gw_node *
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batadv_gw_node_get(struct batadv_priv *bat_priv,
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struct batadv_orig_node *orig_node)
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struct batadv_gw_node *batadv_gw_node_get(struct batadv_priv *bat_priv,
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struct batadv_orig_node *orig_node)
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{
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struct batadv_gw_node *gw_node_tmp, *gw_node = NULL;
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@ -47,5 +47,7 @@ bool batadv_gw_out_of_range(struct batadv_priv *bat_priv, struct sk_buff *skb);
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enum batadv_dhcp_recipient
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batadv_gw_dhcp_recipient_get(struct sk_buff *skb, unsigned int *header_len,
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u8 *chaddr);
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struct batadv_gw_node *batadv_gw_node_get(struct batadv_priv *bat_priv,
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struct batadv_orig_node *orig_node);
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#endif /* _NET_BATMAN_ADV_GATEWAY_CLIENT_H_ */
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