linux/net/batman-adv/gateway_client.c

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/*
* Copyright (C) 2009-2011 B.A.T.M.A.N. contributors:
*
* Marek Lindner
*
* 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, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
* 02110-1301, USA
*
*/
#include "main.h"
#include "gateway_client.h"
#include "gateway_common.h"
#include "hard-interface.h"
#include <linux/ip.h>
#include <linux/ipv6.h>
#include <linux/udp.h>
#include <linux/if_vlan.h>
static void gw_node_free_rcu(struct rcu_head *rcu)
{
struct gw_node *gw_node;
gw_node = container_of(rcu, struct gw_node, rcu);
kfree(gw_node);
}
static void gw_node_free_ref(struct gw_node *gw_node)
{
if (atomic_dec_and_test(&gw_node->refcount))
call_rcu(&gw_node->rcu, gw_node_free_rcu);
}
void *gw_get_selected(struct bat_priv *bat_priv)
{
struct gw_node *curr_gateway_tmp;
struct orig_node *orig_node = NULL;
rcu_read_lock();
curr_gateway_tmp = rcu_dereference(bat_priv->curr_gw);
if (!curr_gateway_tmp)
goto out;
orig_node = curr_gateway_tmp->orig_node;
if (!orig_node)
goto out;
if (!atomic_inc_not_zero(&orig_node->refcount))
orig_node = NULL;
out:
rcu_read_unlock();
return orig_node;
}
void gw_deselect(struct bat_priv *bat_priv)
{
struct gw_node *gw_node;
spin_lock_bh(&bat_priv->gw_list_lock);
gw_node = rcu_dereference(bat_priv->curr_gw);
rcu_assign_pointer(bat_priv->curr_gw, NULL);
spin_unlock_bh(&bat_priv->gw_list_lock);
if (gw_node)
gw_node_free_ref(gw_node);
}
static void gw_select(struct bat_priv *bat_priv, struct gw_node *new_gw_node)
{
struct gw_node *curr_gw_node;
if (new_gw_node && !atomic_inc_not_zero(&new_gw_node->refcount))
new_gw_node = NULL;
spin_lock_bh(&bat_priv->gw_list_lock);
curr_gw_node = rcu_dereference(bat_priv->curr_gw);
rcu_assign_pointer(bat_priv->curr_gw, new_gw_node);
spin_unlock_bh(&bat_priv->gw_list_lock);
if (curr_gw_node)
gw_node_free_ref(curr_gw_node);
}
void gw_election(struct bat_priv *bat_priv)
{
struct hlist_node *node;
struct gw_node *gw_node, *curr_gw, *curr_gw_tmp = NULL;
uint8_t max_tq = 0;
uint32_t max_gw_factor = 0, tmp_gw_factor = 0;
int down, up;
/**
* The batman daemon checks here if we already passed a full originator
* cycle in order to make sure we don't choose the first gateway we
* hear about. This check is based on the daemon's uptime which we
* don't have.
**/
if (atomic_read(&bat_priv->gw_mode) != GW_MODE_CLIENT)
return;
rcu_read_lock();
curr_gw = rcu_dereference(bat_priv->curr_gw);
if (curr_gw) {
rcu_read_unlock();
return;
}
if (hlist_empty(&bat_priv->gw_list)) {
if (curr_gw) {
rcu_read_unlock();
bat_dbg(DBG_BATMAN, bat_priv,
"Removing selected gateway - "
"no gateway in range\n");
gw_deselect(bat_priv);
} else
rcu_read_unlock();
return;
}
hlist_for_each_entry_rcu(gw_node, node, &bat_priv->gw_list, list) {
if (!gw_node->orig_node->router)
continue;
if (gw_node->deleted)
continue;
switch (atomic_read(&bat_priv->gw_sel_class)) {
case 1: /* fast connection */
gw_bandwidth_to_kbit(gw_node->orig_node->gw_flags,
&down, &up);
tmp_gw_factor = (gw_node->orig_node->router->tq_avg *
gw_node->orig_node->router->tq_avg *
down * 100 * 100) /
(TQ_LOCAL_WINDOW_SIZE *
TQ_LOCAL_WINDOW_SIZE * 64);
if ((tmp_gw_factor > max_gw_factor) ||
((tmp_gw_factor == max_gw_factor) &&
(gw_node->orig_node->router->tq_avg > max_tq)))
curr_gw_tmp = gw_node;
break;
default: /**
* 2: stable connection (use best statistic)
* 3: fast-switch (use best statistic but change as
* soon as a better gateway appears)
* XX: late-switch (use best statistic but change as
* soon as a better gateway appears which has
* $routing_class more tq points)
**/
if (gw_node->orig_node->router->tq_avg > max_tq)
curr_gw_tmp = gw_node;
break;
}
if (gw_node->orig_node->router->tq_avg > max_tq)
max_tq = gw_node->orig_node->router->tq_avg;
if (tmp_gw_factor > max_gw_factor)
max_gw_factor = tmp_gw_factor;
}
if (curr_gw != curr_gw_tmp) {
if ((curr_gw) && (!curr_gw_tmp))
bat_dbg(DBG_BATMAN, bat_priv,
"Removing selected gateway - "
"no gateway in range\n");
else if ((!curr_gw) && (curr_gw_tmp))
bat_dbg(DBG_BATMAN, bat_priv,
"Adding route to gateway %pM "
"(gw_flags: %i, tq: %i)\n",
curr_gw_tmp->orig_node->orig,
curr_gw_tmp->orig_node->gw_flags,
curr_gw_tmp->orig_node->router->tq_avg);
else
bat_dbg(DBG_BATMAN, bat_priv,
"Changing route to gateway %pM "
"(gw_flags: %i, tq: %i)\n",
curr_gw_tmp->orig_node->orig,
curr_gw_tmp->orig_node->gw_flags,
curr_gw_tmp->orig_node->router->tq_avg);
gw_select(bat_priv, curr_gw_tmp);
}
rcu_read_unlock();
}
void gw_check_election(struct bat_priv *bat_priv, struct orig_node *orig_node)
{
struct gw_node *curr_gateway_tmp;
uint8_t gw_tq_avg, orig_tq_avg;
rcu_read_lock();
curr_gateway_tmp = rcu_dereference(bat_priv->curr_gw);
if (!curr_gateway_tmp)
goto out_rcu;
if (!curr_gateway_tmp->orig_node)
goto deselect_rcu;
if (!curr_gateway_tmp->orig_node->router)
goto deselect_rcu;
/* this node already is the gateway */
if (curr_gateway_tmp->orig_node == orig_node)
goto out_rcu;
if (!orig_node->router)
goto out_rcu;
gw_tq_avg = curr_gateway_tmp->orig_node->router->tq_avg;
rcu_read_unlock();
orig_tq_avg = orig_node->router->tq_avg;
/* the TQ value has to be better */
if (orig_tq_avg < gw_tq_avg)
goto out;
/**
* if the routing class is greater than 3 the value tells us how much
* greater the TQ value of the new gateway must be
**/
if ((atomic_read(&bat_priv->gw_sel_class) > 3) &&
(orig_tq_avg - gw_tq_avg < atomic_read(&bat_priv->gw_sel_class)))
goto out;
bat_dbg(DBG_BATMAN, bat_priv,
"Restarting gateway selection: better gateway found (tq curr: "
"%i, tq new: %i)\n",
gw_tq_avg, orig_tq_avg);
goto deselect;
out_rcu:
rcu_read_unlock();
goto out;
deselect_rcu:
rcu_read_unlock();
deselect:
gw_deselect(bat_priv);
out:
return;
}
static void gw_node_add(struct bat_priv *bat_priv,
struct orig_node *orig_node, uint8_t new_gwflags)
{
struct gw_node *gw_node;
int down, up;
gw_node = kmalloc(sizeof(struct gw_node), GFP_ATOMIC);
if (!gw_node)
return;
memset(gw_node, 0, sizeof(struct gw_node));
INIT_HLIST_NODE(&gw_node->list);
gw_node->orig_node = orig_node;
atomic_set(&gw_node->refcount, 1);
spin_lock_bh(&bat_priv->gw_list_lock);
hlist_add_head_rcu(&gw_node->list, &bat_priv->gw_list);
spin_unlock_bh(&bat_priv->gw_list_lock);
gw_bandwidth_to_kbit(new_gwflags, &down, &up);
bat_dbg(DBG_BATMAN, bat_priv,
"Found new gateway %pM -> gw_class: %i - %i%s/%i%s\n",
orig_node->orig, new_gwflags,
(down > 2048 ? down / 1024 : down),
(down > 2048 ? "MBit" : "KBit"),
(up > 2048 ? up / 1024 : up),
(up > 2048 ? "MBit" : "KBit"));
}
void gw_node_update(struct bat_priv *bat_priv,
struct orig_node *orig_node, uint8_t new_gwflags)
{
struct hlist_node *node;
struct gw_node *gw_node;
rcu_read_lock();
hlist_for_each_entry_rcu(gw_node, node, &bat_priv->gw_list, list) {
if (gw_node->orig_node != orig_node)
continue;
bat_dbg(DBG_BATMAN, bat_priv,
"Gateway class of originator %pM changed from "
"%i to %i\n",
orig_node->orig, gw_node->orig_node->gw_flags,
new_gwflags);
gw_node->deleted = 0;
if (new_gwflags == 0) {
gw_node->deleted = jiffies;
bat_dbg(DBG_BATMAN, bat_priv,
"Gateway %pM removed from gateway list\n",
orig_node->orig);
if (gw_node == rcu_dereference(bat_priv->curr_gw)) {
rcu_read_unlock();
gw_deselect(bat_priv);
return;
}
}
rcu_read_unlock();
return;
}
rcu_read_unlock();
if (new_gwflags == 0)
return;
gw_node_add(bat_priv, orig_node, new_gwflags);
}
void gw_node_delete(struct bat_priv *bat_priv, struct orig_node *orig_node)
{
return gw_node_update(bat_priv, orig_node, 0);
}
void gw_node_purge(struct bat_priv *bat_priv)
{
struct gw_node *gw_node;
struct hlist_node *node, *node_tmp;
unsigned long timeout = 2 * PURGE_TIMEOUT * HZ;
spin_lock_bh(&bat_priv->gw_list_lock);
hlist_for_each_entry_safe(gw_node, node, node_tmp,
&bat_priv->gw_list, list) {
if (((!gw_node->deleted) ||
(time_before(jiffies, gw_node->deleted + timeout))) &&
atomic_read(&bat_priv->mesh_state) == MESH_ACTIVE)
continue;
if (rcu_dereference(bat_priv->curr_gw) == gw_node)
gw_deselect(bat_priv);
hlist_del_rcu(&gw_node->list);
gw_node_free_ref(gw_node);
}
spin_unlock_bh(&bat_priv->gw_list_lock);
}
static int _write_buffer_text(struct bat_priv *bat_priv,
struct seq_file *seq, struct gw_node *gw_node)
{
struct gw_node *curr_gw;
int down, up, ret;
gw_bandwidth_to_kbit(gw_node->orig_node->gw_flags, &down, &up);
rcu_read_lock();
curr_gw = rcu_dereference(bat_priv->curr_gw);
ret = seq_printf(seq, "%s %pM (%3i) %pM [%10s]: %3i - %i%s/%i%s\n",
(curr_gw == gw_node ? "=>" : " "),
gw_node->orig_node->orig,
gw_node->orig_node->router->tq_avg,
gw_node->orig_node->router->addr,
gw_node->orig_node->router->if_incoming->net_dev->name,
gw_node->orig_node->gw_flags,
(down > 2048 ? down / 1024 : down),
(down > 2048 ? "MBit" : "KBit"),
(up > 2048 ? up / 1024 : up),
(up > 2048 ? "MBit" : "KBit"));
rcu_read_unlock();
return ret;
}
int gw_client_seq_print_text(struct seq_file *seq, void *offset)
{
struct net_device *net_dev = (struct net_device *)seq->private;
struct bat_priv *bat_priv = netdev_priv(net_dev);
struct gw_node *gw_node;
struct hlist_node *node;
int gw_count = 0;
if (!bat_priv->primary_if) {
return seq_printf(seq, "BATMAN mesh %s disabled - please "
"specify interfaces to enable it\n",
net_dev->name);
}
if (bat_priv->primary_if->if_status != IF_ACTIVE) {
return seq_printf(seq, "BATMAN mesh %s disabled - "
"primary interface not active\n",
net_dev->name);
}
seq_printf(seq, " %-12s (%s/%i) %17s [%10s]: gw_class ... "
"[B.A.T.M.A.N. adv %s%s, MainIF/MAC: %s/%pM (%s)]\n",
"Gateway", "#", TQ_MAX_VALUE, "Nexthop",
"outgoingIF", SOURCE_VERSION, REVISION_VERSION_STR,
bat_priv->primary_if->net_dev->name,
bat_priv->primary_if->net_dev->dev_addr, net_dev->name);
rcu_read_lock();
hlist_for_each_entry_rcu(gw_node, node, &bat_priv->gw_list, list) {
if (gw_node->deleted)
continue;
if (!gw_node->orig_node->router)
continue;
_write_buffer_text(bat_priv, seq, gw_node);
gw_count++;
}
rcu_read_unlock();
if (gw_count == 0)
seq_printf(seq, "No gateways in range ...\n");
return 0;
}
int gw_is_target(struct bat_priv *bat_priv, struct sk_buff *skb)
{
struct ethhdr *ethhdr;
struct iphdr *iphdr;
struct ipv6hdr *ipv6hdr;
struct udphdr *udphdr;
unsigned int header_len = 0;
if (atomic_read(&bat_priv->gw_mode) == GW_MODE_OFF)
return 0;
/* check for ethernet header */
if (!pskb_may_pull(skb, header_len + ETH_HLEN))
return 0;
ethhdr = (struct ethhdr *)skb->data;
header_len += ETH_HLEN;
/* check for initial vlan header */
if (ntohs(ethhdr->h_proto) == ETH_P_8021Q) {
if (!pskb_may_pull(skb, header_len + VLAN_HLEN))
return 0;
ethhdr = (struct ethhdr *)(skb->data + VLAN_HLEN);
header_len += VLAN_HLEN;
}
/* check for ip header */
switch (ntohs(ethhdr->h_proto)) {
case ETH_P_IP:
if (!pskb_may_pull(skb, header_len + sizeof(struct iphdr)))
return 0;
iphdr = (struct iphdr *)(skb->data + header_len);
header_len += iphdr->ihl * 4;
/* check for udp header */
if (iphdr->protocol != IPPROTO_UDP)
return 0;
break;
case ETH_P_IPV6:
if (!pskb_may_pull(skb, header_len + sizeof(struct ipv6hdr)))
return 0;
ipv6hdr = (struct ipv6hdr *)(skb->data + header_len);
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;
}