mirror of
https://github.com/torvalds/linux.git
synced 2024-12-05 02:23:16 +00:00
06f4e926d2
* git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next-2.6: (1446 commits) macvlan: fix panic if lowerdev in a bond tg3: Add braces around 5906 workaround. tg3: Fix NETIF_F_LOOPBACK error macvlan: remove one synchronize_rcu() call networking: NET_CLS_ROUTE4 depends on INET irda: Fix error propagation in ircomm_lmp_connect_response() irda: Kill set but unused variable 'bytes' in irlan_check_command_param() irda: Kill set but unused variable 'clen' in ircomm_connect_indication() rxrpc: Fix set but unused variable 'usage' in rxrpc_get_transport() be2net: Kill set but unused variable 'req' in lancer_fw_download() irda: Kill set but unused vars 'saddr' and 'daddr' in irlan_provider_connect_indication() atl1c: atl1c_resume() is only used when CONFIG_PM_SLEEP is defined. rxrpc: Fix set but unused variable 'usage' in rxrpc_get_peer(). rxrpc: Kill set but unused variable 'local' in rxrpc_UDP_error_handler() rxrpc: Kill set but unused variable 'sp' in rxrpc_process_connection() rxrpc: Kill set but unused variable 'sp' in rxrpc_rotate_tx_window() pkt_sched: Kill set but unused variable 'protocol' in tc_classify() isdn: capi: Use pr_debug() instead of ifdefs. tg3: Update version to 3.119 tg3: Apply rx_discards fix to 5719/5720 ... Fix up trivial conflicts in arch/x86/Kconfig and net/mac80211/agg-tx.c as per Davem.
562 lines
14 KiB
C
562 lines
14 KiB
C
/*
|
|
* 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 "originator.h"
|
|
#include <linux/ip.h>
|
|
#include <linux/ipv6.h>
|
|
#include <linux/udp.h>
|
|
#include <linux/if_vlan.h>
|
|
|
|
static void gw_node_free_ref(struct gw_node *gw_node)
|
|
{
|
|
if (atomic_dec_and_test(&gw_node->refcount))
|
|
kfree_rcu(gw_node, rcu);
|
|
}
|
|
|
|
static struct gw_node *gw_get_selected_gw_node(struct bat_priv *bat_priv)
|
|
{
|
|
struct gw_node *gw_node;
|
|
|
|
rcu_read_lock();
|
|
gw_node = rcu_dereference(bat_priv->curr_gw);
|
|
if (!gw_node)
|
|
goto out;
|
|
|
|
if (!atomic_inc_not_zero(&gw_node->refcount))
|
|
gw_node = NULL;
|
|
|
|
out:
|
|
rcu_read_unlock();
|
|
return gw_node;
|
|
}
|
|
|
|
struct orig_node *gw_get_selected_orig(struct bat_priv *bat_priv)
|
|
{
|
|
struct gw_node *gw_node;
|
|
struct orig_node *orig_node = NULL;
|
|
|
|
gw_node = gw_get_selected_gw_node(bat_priv);
|
|
if (!gw_node)
|
|
goto out;
|
|
|
|
rcu_read_lock();
|
|
orig_node = gw_node->orig_node;
|
|
if (!orig_node)
|
|
goto unlock;
|
|
|
|
if (!atomic_inc_not_zero(&orig_node->refcount))
|
|
orig_node = NULL;
|
|
|
|
unlock:
|
|
rcu_read_unlock();
|
|
out:
|
|
if (gw_node)
|
|
gw_node_free_ref(gw_node);
|
|
return orig_node;
|
|
}
|
|
|
|
static void gw_select(struct bat_priv *bat_priv, struct gw_node *new_gw_node)
|
|
{
|
|
struct gw_node *curr_gw_node;
|
|
|
|
spin_lock_bh(&bat_priv->gw_list_lock);
|
|
|
|
if (new_gw_node && !atomic_inc_not_zero(&new_gw_node->refcount))
|
|
new_gw_node = NULL;
|
|
|
|
curr_gw_node = bat_priv->curr_gw;
|
|
rcu_assign_pointer(bat_priv->curr_gw, new_gw_node);
|
|
|
|
if (curr_gw_node)
|
|
gw_node_free_ref(curr_gw_node);
|
|
|
|
spin_unlock_bh(&bat_priv->gw_list_lock);
|
|
}
|
|
|
|
void gw_deselect(struct bat_priv *bat_priv)
|
|
{
|
|
gw_select(bat_priv, NULL);
|
|
}
|
|
|
|
void gw_election(struct bat_priv *bat_priv)
|
|
{
|
|
struct hlist_node *node;
|
|
struct gw_node *gw_node, *curr_gw = NULL, *curr_gw_tmp = NULL;
|
|
struct neigh_node *router;
|
|
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;
|
|
|
|
curr_gw = gw_get_selected_gw_node(bat_priv);
|
|
if (curr_gw)
|
|
goto out;
|
|
|
|
rcu_read_lock();
|
|
if (hlist_empty(&bat_priv->gw_list)) {
|
|
bat_dbg(DBG_BATMAN, bat_priv,
|
|
"Removing selected gateway - "
|
|
"no gateway in range\n");
|
|
gw_deselect(bat_priv);
|
|
goto unlock;
|
|
}
|
|
|
|
hlist_for_each_entry_rcu(gw_node, node, &bat_priv->gw_list, list) {
|
|
if (gw_node->deleted)
|
|
continue;
|
|
|
|
router = orig_node_get_router(gw_node->orig_node);
|
|
if (!router)
|
|
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 = (router->tq_avg * 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) &&
|
|
(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 (router->tq_avg > max_tq)
|
|
curr_gw_tmp = gw_node;
|
|
break;
|
|
}
|
|
|
|
if (router->tq_avg > max_tq)
|
|
max_tq = router->tq_avg;
|
|
|
|
if (tmp_gw_factor > max_gw_factor)
|
|
max_gw_factor = tmp_gw_factor;
|
|
|
|
neigh_node_free_ref(router);
|
|
}
|
|
|
|
if (curr_gw != curr_gw_tmp) {
|
|
router = orig_node_get_router(curr_gw_tmp->orig_node);
|
|
if (!router)
|
|
goto unlock;
|
|
|
|
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,
|
|
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,
|
|
router->tq_avg);
|
|
|
|
neigh_node_free_ref(router);
|
|
gw_select(bat_priv, curr_gw_tmp);
|
|
}
|
|
|
|
unlock:
|
|
rcu_read_unlock();
|
|
out:
|
|
if (curr_gw)
|
|
gw_node_free_ref(curr_gw);
|
|
}
|
|
|
|
void gw_check_election(struct bat_priv *bat_priv, struct orig_node *orig_node)
|
|
{
|
|
struct orig_node *curr_gw_orig;
|
|
struct neigh_node *router_gw = NULL, *router_orig = NULL;
|
|
uint8_t gw_tq_avg, orig_tq_avg;
|
|
|
|
curr_gw_orig = gw_get_selected_orig(bat_priv);
|
|
if (!curr_gw_orig)
|
|
goto deselect;
|
|
|
|
router_gw = orig_node_get_router(curr_gw_orig);
|
|
if (!router_gw)
|
|
goto deselect;
|
|
|
|
/* this node already is the gateway */
|
|
if (curr_gw_orig == orig_node)
|
|
goto out;
|
|
|
|
router_orig = orig_node_get_router(orig_node);
|
|
if (!router_orig)
|
|
goto out;
|
|
|
|
gw_tq_avg = router_gw->tq_avg;
|
|
orig_tq_avg = router_orig->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);
|
|
|
|
deselect:
|
|
gw_deselect(bat_priv);
|
|
out:
|
|
if (curr_gw_orig)
|
|
orig_node_free_ref(curr_gw_orig);
|
|
if (router_gw)
|
|
neigh_node_free_ref(router_gw);
|
|
if (router_orig)
|
|
neigh_node_free_ref(router_orig);
|
|
|
|
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, *curr_gw;
|
|
|
|
/**
|
|
* Note: We don't need a NULL check here, since curr_gw never gets
|
|
* dereferenced. If curr_gw is NULL we also should not exit as we may
|
|
* have this gateway in our list (duplication check!) even though we
|
|
* have no currently selected gateway.
|
|
*/
|
|
curr_gw = gw_get_selected_gw_node(bat_priv);
|
|
|
|
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 == curr_gw)
|
|
goto deselect;
|
|
}
|
|
|
|
goto unlock;
|
|
}
|
|
|
|
if (new_gwflags == 0)
|
|
goto unlock;
|
|
|
|
gw_node_add(bat_priv, orig_node, new_gwflags);
|
|
goto unlock;
|
|
|
|
deselect:
|
|
gw_deselect(bat_priv);
|
|
unlock:
|
|
rcu_read_unlock();
|
|
|
|
if (curr_gw)
|
|
gw_node_free_ref(curr_gw);
|
|
}
|
|
|
|
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, *curr_gw;
|
|
struct hlist_node *node, *node_tmp;
|
|
unsigned long timeout = 2 * PURGE_TIMEOUT * HZ;
|
|
char do_deselect = 0;
|
|
|
|
curr_gw = gw_get_selected_gw_node(bat_priv);
|
|
|
|
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 (curr_gw == gw_node)
|
|
do_deselect = 1;
|
|
|
|
hlist_del_rcu(&gw_node->list);
|
|
gw_node_free_ref(gw_node);
|
|
}
|
|
|
|
spin_unlock_bh(&bat_priv->gw_list_lock);
|
|
|
|
/* gw_deselect() needs to acquire the gw_list_lock */
|
|
if (do_deselect)
|
|
gw_deselect(bat_priv);
|
|
|
|
if (curr_gw)
|
|
gw_node_free_ref(curr_gw);
|
|
}
|
|
|
|
/**
|
|
* fails if orig_node has no router
|
|
*/
|
|
static int _write_buffer_text(struct bat_priv *bat_priv,
|
|
struct seq_file *seq, struct gw_node *gw_node)
|
|
{
|
|
struct gw_node *curr_gw;
|
|
struct neigh_node *router;
|
|
int down, up, ret = -1;
|
|
|
|
gw_bandwidth_to_kbit(gw_node->orig_node->gw_flags, &down, &up);
|
|
|
|
router = orig_node_get_router(gw_node->orig_node);
|
|
if (!router)
|
|
goto out;
|
|
|
|
curr_gw = gw_get_selected_gw_node(bat_priv);
|
|
|
|
ret = seq_printf(seq, "%s %pM (%3i) %pM [%10s]: %3i - %i%s/%i%s\n",
|
|
(curr_gw == gw_node ? "=>" : " "),
|
|
gw_node->orig_node->orig,
|
|
router->tq_avg, router->addr,
|
|
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"));
|
|
|
|
neigh_node_free_ref(router);
|
|
if (curr_gw)
|
|
gw_node_free_ref(curr_gw);
|
|
out:
|
|
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 hard_iface *primary_if;
|
|
struct gw_node *gw_node;
|
|
struct hlist_node *node;
|
|
int gw_count = 0, ret = 0;
|
|
|
|
primary_if = primary_if_get_selected(bat_priv);
|
|
if (!primary_if) {
|
|
ret = seq_printf(seq, "BATMAN mesh %s disabled - please "
|
|
"specify interfaces to enable it\n",
|
|
net_dev->name);
|
|
goto out;
|
|
}
|
|
|
|
if (primary_if->if_status != IF_ACTIVE) {
|
|
ret = seq_printf(seq, "BATMAN mesh %s disabled - "
|
|
"primary interface not active\n",
|
|
net_dev->name);
|
|
goto out;
|
|
}
|
|
|
|
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,
|
|
primary_if->net_dev->name,
|
|
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;
|
|
|
|
/* fails if orig_node has no router */
|
|
if (_write_buffer_text(bat_priv, seq, gw_node) < 0)
|
|
continue;
|
|
|
|
gw_count++;
|
|
}
|
|
rcu_read_unlock();
|
|
|
|
if (gw_count == 0)
|
|
seq_printf(seq, "No gateways in range ...\n");
|
|
|
|
out:
|
|
if (primary_if)
|
|
hardif_free_ref(primary_if);
|
|
return ret;
|
|
}
|
|
|
|
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;
|
|
struct gw_node *curr_gw;
|
|
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;
|
|
|
|
curr_gw = gw_get_selected_gw_node(bat_priv);
|
|
if (!curr_gw)
|
|
return 0;
|
|
|
|
if (curr_gw)
|
|
gw_node_free_ref(curr_gw);
|
|
return 1;
|
|
}
|