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eb340b2f80
The RCU callback gw_node_free_rcu() just calls kfree(), so we can use kfree_rcu() instead of call_rcu(). Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Cc: Marek Lindner <lindner_marek@yahoo.de> Cc: Simon Wunderlich <siwu@hrz.tu-chemnitz.de> Acked-by: David S. Miller <davem@davemloft.net> Reviewed-by: Josh Triplett <josh@joshtriplett.org> Acked-by: Sven Eckelmann <sven@narfation.org>
510 lines
13 KiB
C
510 lines
13 KiB
C
/*
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* Copyright (C) 2009-2011 B.A.T.M.A.N. contributors:
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*
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* Marek Lindner
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of version 2 of the GNU General Public
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* License as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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* 02110-1301, USA
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*
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*/
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#include "main.h"
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#include "gateway_client.h"
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#include "gateway_common.h"
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#include "hard-interface.h"
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#include <linux/ip.h>
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#include <linux/ipv6.h>
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#include <linux/udp.h>
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#include <linux/if_vlan.h>
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static void gw_node_free_ref(struct gw_node *gw_node)
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{
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if (atomic_dec_and_test(&gw_node->refcount))
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kfree_rcu(gw_node, rcu);
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}
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void *gw_get_selected(struct bat_priv *bat_priv)
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{
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struct gw_node *curr_gateway_tmp;
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struct orig_node *orig_node = NULL;
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rcu_read_lock();
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curr_gateway_tmp = rcu_dereference(bat_priv->curr_gw);
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if (!curr_gateway_tmp)
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goto out;
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orig_node = curr_gateway_tmp->orig_node;
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if (!orig_node)
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goto out;
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if (!atomic_inc_not_zero(&orig_node->refcount))
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orig_node = NULL;
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out:
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rcu_read_unlock();
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return orig_node;
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}
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void gw_deselect(struct bat_priv *bat_priv)
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{
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struct gw_node *gw_node;
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spin_lock_bh(&bat_priv->gw_list_lock);
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gw_node = rcu_dereference(bat_priv->curr_gw);
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rcu_assign_pointer(bat_priv->curr_gw, NULL);
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spin_unlock_bh(&bat_priv->gw_list_lock);
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if (gw_node)
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gw_node_free_ref(gw_node);
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}
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static void gw_select(struct bat_priv *bat_priv, struct gw_node *new_gw_node)
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{
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struct gw_node *curr_gw_node;
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if (new_gw_node && !atomic_inc_not_zero(&new_gw_node->refcount))
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new_gw_node = NULL;
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spin_lock_bh(&bat_priv->gw_list_lock);
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curr_gw_node = rcu_dereference(bat_priv->curr_gw);
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rcu_assign_pointer(bat_priv->curr_gw, new_gw_node);
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spin_unlock_bh(&bat_priv->gw_list_lock);
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if (curr_gw_node)
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gw_node_free_ref(curr_gw_node);
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}
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void gw_election(struct bat_priv *bat_priv)
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{
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struct hlist_node *node;
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struct gw_node *gw_node, *curr_gw, *curr_gw_tmp = NULL;
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uint8_t max_tq = 0;
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uint32_t max_gw_factor = 0, tmp_gw_factor = 0;
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int down, up;
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/**
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* The batman daemon checks here if we already passed a full originator
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* cycle in order to make sure we don't choose the first gateway we
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* hear about. This check is based on the daemon's uptime which we
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* don't have.
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**/
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if (atomic_read(&bat_priv->gw_mode) != GW_MODE_CLIENT)
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return;
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rcu_read_lock();
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curr_gw = rcu_dereference(bat_priv->curr_gw);
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if (curr_gw) {
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rcu_read_unlock();
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return;
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}
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if (hlist_empty(&bat_priv->gw_list)) {
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if (curr_gw) {
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rcu_read_unlock();
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bat_dbg(DBG_BATMAN, bat_priv,
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"Removing selected gateway - "
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"no gateway in range\n");
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gw_deselect(bat_priv);
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} else
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rcu_read_unlock();
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return;
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}
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hlist_for_each_entry_rcu(gw_node, node, &bat_priv->gw_list, list) {
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if (!gw_node->orig_node->router)
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continue;
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if (gw_node->deleted)
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continue;
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switch (atomic_read(&bat_priv->gw_sel_class)) {
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case 1: /* fast connection */
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gw_bandwidth_to_kbit(gw_node->orig_node->gw_flags,
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&down, &up);
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tmp_gw_factor = (gw_node->orig_node->router->tq_avg *
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gw_node->orig_node->router->tq_avg *
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down * 100 * 100) /
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(TQ_LOCAL_WINDOW_SIZE *
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TQ_LOCAL_WINDOW_SIZE * 64);
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if ((tmp_gw_factor > max_gw_factor) ||
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((tmp_gw_factor == max_gw_factor) &&
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(gw_node->orig_node->router->tq_avg > max_tq)))
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curr_gw_tmp = gw_node;
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break;
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default: /**
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* 2: stable connection (use best statistic)
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* 3: fast-switch (use best statistic but change as
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* soon as a better gateway appears)
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* XX: late-switch (use best statistic but change as
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* soon as a better gateway appears which has
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* $routing_class more tq points)
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**/
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if (gw_node->orig_node->router->tq_avg > max_tq)
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curr_gw_tmp = gw_node;
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break;
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}
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if (gw_node->orig_node->router->tq_avg > max_tq)
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max_tq = gw_node->orig_node->router->tq_avg;
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if (tmp_gw_factor > max_gw_factor)
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max_gw_factor = tmp_gw_factor;
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}
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if (curr_gw != curr_gw_tmp) {
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if ((curr_gw) && (!curr_gw_tmp))
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bat_dbg(DBG_BATMAN, bat_priv,
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"Removing selected gateway - "
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"no gateway in range\n");
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else if ((!curr_gw) && (curr_gw_tmp))
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bat_dbg(DBG_BATMAN, bat_priv,
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"Adding route to gateway %pM "
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"(gw_flags: %i, tq: %i)\n",
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curr_gw_tmp->orig_node->orig,
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curr_gw_tmp->orig_node->gw_flags,
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curr_gw_tmp->orig_node->router->tq_avg);
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else
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bat_dbg(DBG_BATMAN, bat_priv,
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"Changing route to gateway %pM "
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"(gw_flags: %i, tq: %i)\n",
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curr_gw_tmp->orig_node->orig,
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curr_gw_tmp->orig_node->gw_flags,
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curr_gw_tmp->orig_node->router->tq_avg);
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gw_select(bat_priv, curr_gw_tmp);
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}
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rcu_read_unlock();
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}
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void gw_check_election(struct bat_priv *bat_priv, struct orig_node *orig_node)
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{
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struct gw_node *curr_gateway_tmp;
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uint8_t gw_tq_avg, orig_tq_avg;
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rcu_read_lock();
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curr_gateway_tmp = rcu_dereference(bat_priv->curr_gw);
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if (!curr_gateway_tmp)
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goto out_rcu;
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if (!curr_gateway_tmp->orig_node)
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goto deselect_rcu;
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if (!curr_gateway_tmp->orig_node->router)
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goto deselect_rcu;
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/* this node already is the gateway */
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if (curr_gateway_tmp->orig_node == orig_node)
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goto out_rcu;
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if (!orig_node->router)
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goto out_rcu;
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gw_tq_avg = curr_gateway_tmp->orig_node->router->tq_avg;
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rcu_read_unlock();
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orig_tq_avg = orig_node->router->tq_avg;
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/* the TQ value has to be better */
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if (orig_tq_avg < gw_tq_avg)
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goto out;
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/**
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* if the routing class is greater than 3 the value tells us how much
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* greater the TQ value of the new gateway must be
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**/
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if ((atomic_read(&bat_priv->gw_sel_class) > 3) &&
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(orig_tq_avg - gw_tq_avg < atomic_read(&bat_priv->gw_sel_class)))
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goto out;
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bat_dbg(DBG_BATMAN, bat_priv,
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"Restarting gateway selection: better gateway found (tq curr: "
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"%i, tq new: %i)\n",
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gw_tq_avg, orig_tq_avg);
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goto deselect;
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out_rcu:
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rcu_read_unlock();
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goto out;
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deselect_rcu:
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rcu_read_unlock();
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deselect:
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gw_deselect(bat_priv);
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out:
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return;
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}
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static void gw_node_add(struct bat_priv *bat_priv,
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struct orig_node *orig_node, uint8_t new_gwflags)
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{
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struct gw_node *gw_node;
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int down, up;
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gw_node = kmalloc(sizeof(struct gw_node), GFP_ATOMIC);
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if (!gw_node)
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return;
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memset(gw_node, 0, sizeof(struct gw_node));
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INIT_HLIST_NODE(&gw_node->list);
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gw_node->orig_node = orig_node;
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atomic_set(&gw_node->refcount, 1);
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spin_lock_bh(&bat_priv->gw_list_lock);
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hlist_add_head_rcu(&gw_node->list, &bat_priv->gw_list);
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spin_unlock_bh(&bat_priv->gw_list_lock);
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gw_bandwidth_to_kbit(new_gwflags, &down, &up);
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bat_dbg(DBG_BATMAN, bat_priv,
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"Found new gateway %pM -> gw_class: %i - %i%s/%i%s\n",
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orig_node->orig, new_gwflags,
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(down > 2048 ? down / 1024 : down),
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(down > 2048 ? "MBit" : "KBit"),
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(up > 2048 ? up / 1024 : up),
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(up > 2048 ? "MBit" : "KBit"));
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}
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void gw_node_update(struct bat_priv *bat_priv,
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struct orig_node *orig_node, uint8_t new_gwflags)
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{
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struct hlist_node *node;
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struct gw_node *gw_node;
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rcu_read_lock();
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hlist_for_each_entry_rcu(gw_node, node, &bat_priv->gw_list, list) {
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if (gw_node->orig_node != orig_node)
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continue;
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bat_dbg(DBG_BATMAN, bat_priv,
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"Gateway class of originator %pM changed from "
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"%i to %i\n",
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orig_node->orig, gw_node->orig_node->gw_flags,
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new_gwflags);
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gw_node->deleted = 0;
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if (new_gwflags == 0) {
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gw_node->deleted = jiffies;
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bat_dbg(DBG_BATMAN, bat_priv,
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"Gateway %pM removed from gateway list\n",
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orig_node->orig);
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if (gw_node == rcu_dereference(bat_priv->curr_gw)) {
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rcu_read_unlock();
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gw_deselect(bat_priv);
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return;
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}
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}
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rcu_read_unlock();
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return;
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}
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rcu_read_unlock();
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if (new_gwflags == 0)
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return;
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gw_node_add(bat_priv, orig_node, new_gwflags);
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}
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void gw_node_delete(struct bat_priv *bat_priv, struct orig_node *orig_node)
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{
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return gw_node_update(bat_priv, orig_node, 0);
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}
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void gw_node_purge(struct bat_priv *bat_priv)
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{
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struct gw_node *gw_node;
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struct hlist_node *node, *node_tmp;
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unsigned long timeout = 2 * PURGE_TIMEOUT * HZ;
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spin_lock_bh(&bat_priv->gw_list_lock);
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hlist_for_each_entry_safe(gw_node, node, node_tmp,
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&bat_priv->gw_list, list) {
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if (((!gw_node->deleted) ||
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(time_before(jiffies, gw_node->deleted + timeout))) &&
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atomic_read(&bat_priv->mesh_state) == MESH_ACTIVE)
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continue;
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if (rcu_dereference(bat_priv->curr_gw) == gw_node)
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gw_deselect(bat_priv);
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hlist_del_rcu(&gw_node->list);
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gw_node_free_ref(gw_node);
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}
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spin_unlock_bh(&bat_priv->gw_list_lock);
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}
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static int _write_buffer_text(struct bat_priv *bat_priv,
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struct seq_file *seq, struct gw_node *gw_node)
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{
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struct gw_node *curr_gw;
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int down, up, ret;
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gw_bandwidth_to_kbit(gw_node->orig_node->gw_flags, &down, &up);
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rcu_read_lock();
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curr_gw = rcu_dereference(bat_priv->curr_gw);
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ret = seq_printf(seq, "%s %pM (%3i) %pM [%10s]: %3i - %i%s/%i%s\n",
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(curr_gw == gw_node ? "=>" : " "),
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gw_node->orig_node->orig,
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gw_node->orig_node->router->tq_avg,
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gw_node->orig_node->router->addr,
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gw_node->orig_node->router->if_incoming->net_dev->name,
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gw_node->orig_node->gw_flags,
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(down > 2048 ? down / 1024 : down),
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(down > 2048 ? "MBit" : "KBit"),
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(up > 2048 ? up / 1024 : up),
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(up > 2048 ? "MBit" : "KBit"));
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rcu_read_unlock();
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return ret;
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}
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int gw_client_seq_print_text(struct seq_file *seq, void *offset)
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{
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struct net_device *net_dev = (struct net_device *)seq->private;
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struct bat_priv *bat_priv = netdev_priv(net_dev);
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struct gw_node *gw_node;
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struct hlist_node *node;
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int gw_count = 0;
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if (!bat_priv->primary_if) {
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return seq_printf(seq, "BATMAN mesh %s disabled - please "
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"specify interfaces to enable it\n",
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net_dev->name);
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}
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if (bat_priv->primary_if->if_status != IF_ACTIVE) {
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return seq_printf(seq, "BATMAN mesh %s disabled - "
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"primary interface not active\n",
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net_dev->name);
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}
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seq_printf(seq, " %-12s (%s/%i) %17s [%10s]: gw_class ... "
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"[B.A.T.M.A.N. adv %s%s, MainIF/MAC: %s/%pM (%s)]\n",
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"Gateway", "#", TQ_MAX_VALUE, "Nexthop",
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"outgoingIF", SOURCE_VERSION, REVISION_VERSION_STR,
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bat_priv->primary_if->net_dev->name,
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bat_priv->primary_if->net_dev->dev_addr, net_dev->name);
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rcu_read_lock();
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hlist_for_each_entry_rcu(gw_node, node, &bat_priv->gw_list, list) {
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if (gw_node->deleted)
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continue;
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if (!gw_node->orig_node->router)
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continue;
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_write_buffer_text(bat_priv, seq, gw_node);
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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_printf(seq, "No gateways in range ...\n");
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return 0;
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}
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int gw_is_target(struct bat_priv *bat_priv, struct sk_buff *skb)
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{
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struct ethhdr *ethhdr;
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struct iphdr *iphdr;
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struct ipv6hdr *ipv6hdr;
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struct udphdr *udphdr;
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unsigned int header_len = 0;
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if (atomic_read(&bat_priv->gw_mode) == GW_MODE_OFF)
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return 0;
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/* check for ethernet header */
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if (!pskb_may_pull(skb, header_len + ETH_HLEN))
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return 0;
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ethhdr = (struct ethhdr *)skb->data;
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header_len += ETH_HLEN;
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/* check for initial vlan header */
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if (ntohs(ethhdr->h_proto) == ETH_P_8021Q) {
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if (!pskb_may_pull(skb, header_len + VLAN_HLEN))
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return 0;
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ethhdr = (struct ethhdr *)(skb->data + VLAN_HLEN);
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header_len += VLAN_HLEN;
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}
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/* check for ip header */
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switch (ntohs(ethhdr->h_proto)) {
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case ETH_P_IP:
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if (!pskb_may_pull(skb, header_len + sizeof(struct iphdr)))
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return 0;
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iphdr = (struct iphdr *)(skb->data + header_len);
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header_len += iphdr->ihl * 4;
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/* check for udp header */
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if (iphdr->protocol != IPPROTO_UDP)
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return 0;
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break;
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case ETH_P_IPV6:
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if (!pskb_may_pull(skb, header_len + sizeof(struct ipv6hdr)))
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return 0;
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ipv6hdr = (struct ipv6hdr *)(skb->data + header_len);
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header_len += sizeof(struct ipv6hdr);
|
|
|
|
/* check for udp header */
|
|
if (ipv6hdr->nexthdr != IPPROTO_UDP)
|
|
return 0;
|
|
|
|
break;
|
|
default:
|
|
return 0;
|
|
}
|
|
|
|
if (!pskb_may_pull(skb, header_len + sizeof(struct udphdr)))
|
|
return 0;
|
|
udphdr = (struct udphdr *)(skb->data + header_len);
|
|
header_len += sizeof(struct udphdr);
|
|
|
|
/* check for bootp port */
|
|
if ((ntohs(ethhdr->h_proto) == ETH_P_IP) &&
|
|
(ntohs(udphdr->dest) != 67))
|
|
return 0;
|
|
|
|
if ((ntohs(ethhdr->h_proto) == ETH_P_IPV6) &&
|
|
(ntohs(udphdr->dest) != 547))
|
|
return 0;
|
|
|
|
if (atomic_read(&bat_priv->gw_mode) == GW_MODE_SERVER)
|
|
return -1;
|
|
|
|
rcu_read_lock();
|
|
if (!rcu_dereference(bat_priv->curr_gw)) {
|
|
rcu_read_unlock();
|
|
return 0;
|
|
}
|
|
rcu_read_unlock();
|
|
|
|
return 1;
|
|
}
|