Release 4.14 net/batman-adv/gateway_client.c
/* Copyright (C) 2009-2017 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, see <http://www.gnu.org/licenses/>.
*/
#include "gateway_client.h"
#include "main.h"
#include <linux/atomic.h>
#include <linux/byteorder/generic.h>
#include <linux/errno.h>
#include <linux/etherdevice.h>
#include <linux/fs.h>
#include <linux/if_ether.h>
#include <linux/if_vlan.h>
#include <linux/in.h>
#include <linux/ip.h>
#include <linux/ipv6.h>
#include <linux/kernel.h>
#include <linux/kref.h>
#include <linux/list.h>
#include <linux/netdevice.h>
#include <linux/netlink.h>
#include <linux/rculist.h>
#include <linux/rcupdate.h>
#include <linux/seq_file.h>
#include <linux/skbuff.h>
#include <linux/slab.h>
#include <linux/spinlock.h>
#include <linux/stddef.h>
#include <linux/udp.h>
#include <net/sock.h>
#include <uapi/linux/batman_adv.h>
#include "gateway_common.h"
#include "hard-interface.h"
#include "log.h"
#include "netlink.h"
#include "originator.h"
#include "packet.h"
#include "routing.h"
#include "soft-interface.h"
#include "sysfs.h"
#include "translation-table.h"
/* These are the offsets of the "hw type" and "hw address length" in the dhcp
* packet starting at the beginning of the dhcp header
*/
#define BATADV_DHCP_HTYPE_OFFSET 1
#define BATADV_DHCP_HLEN_OFFSET 2
/* Value of htype representing Ethernet */
#define BATADV_DHCP_HTYPE_ETHERNET 0x01
/* This is the offset of the "chaddr" field in the dhcp packet starting at the
* beginning of the dhcp header
*/
#define BATADV_DHCP_CHADDR_OFFSET 28
/**
* batadv_gw_node_release - release gw_node from lists and queue for free after
* rcu grace period
* @ref: kref pointer of the gw_node
*/
static void batadv_gw_node_release(struct kref *ref)
{
struct batadv_gw_node *gw_node;
gw_node = container_of(ref, struct batadv_gw_node, refcount);
batadv_orig_node_put(gw_node->orig_node);
kfree_rcu(gw_node, rcu);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Sven Eckelmann | 31 | 73.81% | 3 | 50.00% |
| Antonio Quartulli | 6 | 14.29% | 1 | 16.67% |
| Marek Lindner | 3 | 7.14% | 1 | 16.67% |
| Paul E. McKenney | 2 | 4.76% | 1 | 16.67% |
| Total | 42 | 100.00% | 6 | 100.00% |
/**
* batadv_gw_node_put - decrement the gw_node refcounter and possibly release it
* @gw_node: gateway node to free
*/
void batadv_gw_node_put(struct batadv_gw_node *gw_node)
{
kref_put(&gw_node->refcount, batadv_gw_node_release);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Sven Eckelmann | 19 | 95.00% | 2 | 66.67% |
| Antonio Quartulli | 1 | 5.00% | 1 | 33.33% |
| Total | 20 | 100.00% | 3 | 100.00% |
struct batadv_gw_node *
batadv_gw_get_selected_gw_node(struct batadv_priv *bat_priv)
{
struct batadv_gw_node *gw_node;
rcu_read_lock();
gw_node = rcu_dereference(bat_priv->gw.curr_gw);
if (!gw_node)
goto out;
if (!kref_get_unless_zero(&gw_node->refcount))
gw_node = NULL;
out:
rcu_read_unlock();
return gw_node;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Sven Eckelmann | 24 | 38.71% | 5 | 50.00% |
| Linus Lüssing | 23 | 37.10% | 3 | 30.00% |
| Marek Lindner | 15 | 24.19% | 2 | 20.00% |
| Total | 62 | 100.00% | 10 | 100.00% |
struct batadv_orig_node *
batadv_gw_get_selected_orig(struct batadv_priv *bat_priv)
{
struct batadv_gw_node *gw_node;
struct batadv_orig_node *orig_node = NULL;
gw_node = batadv_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 (!kref_get_unless_zero(&orig_node->refcount))
orig_node = NULL;
unlock:
rcu_read_unlock();
out:
if (gw_node)
batadv_gw_node_put(gw_node);
return orig_node;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Marek Lindner | 49 | 54.44% | 1 | 12.50% |
| Sven Eckelmann | 30 | 33.33% | 6 | 75.00% |
| Linus Lüssing | 11 | 12.22% | 1 | 12.50% |
| Total | 90 | 100.00% | 8 | 100.00% |
static void batadv_gw_select(struct batadv_priv *bat_priv,
struct batadv_gw_node *new_gw_node)
{
struct batadv_gw_node *curr_gw_node;
spin_lock_bh(&bat_priv->gw.list_lock);
if (new_gw_node)
kref_get(&new_gw_node->refcount);
curr_gw_node = rcu_dereference_protected(bat_priv->gw.curr_gw, 1);
rcu_assign_pointer(bat_priv->gw.curr_gw, new_gw_node);
if (curr_gw_node)
batadv_gw_node_put(curr_gw_node);
spin_unlock_bh(&bat_priv->gw.list_lock);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Sven Eckelmann | 50 | 58.14% | 7 | 70.00% |
| Linus Lüssing | 19 | 22.09% | 1 | 10.00% |
| Marek Lindner | 17 | 19.77% | 2 | 20.00% |
| Total | 86 | 100.00% | 10 | 100.00% |
/**
* batadv_gw_reselect - force a gateway reselection
* @bat_priv: the bat priv with all the soft interface information
*
* Set a flag to remind the GW component to perform a new gateway reselection.
* However this function does not ensure that the current gateway is going to be
* deselected. The reselection mechanism may elect the same gateway once again.
*
* This means that invoking batadv_gw_reselect() does not guarantee a gateway
* change and therefore a uevent is not necessarily expected.
*/
void batadv_gw_reselect(struct batadv_priv *bat_priv)
{
atomic_set(&bat_priv->gw.reselect, 1);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Marek Lindner | 12 | 54.55% | 2 | 28.57% |
| Antonio Quartulli | 5 | 22.73% | 2 | 28.57% |
| Sven Eckelmann | 5 | 22.73% | 3 | 42.86% |
| Total | 22 | 100.00% | 7 | 100.00% |
/**
* batadv_gw_check_client_stop - check if client mode has been switched off
* @bat_priv: the bat priv with all the soft interface information
*
* This function assumes the caller has checked that the gw state *is actually
* changing*. This function is not supposed to be called when there is no state
* change.
*/
void batadv_gw_check_client_stop(struct batadv_priv *bat_priv)
{
struct batadv_gw_node *curr_gw;
if (atomic_read(&bat_priv->gw.mode) != BATADV_GW_MODE_CLIENT)
return;
curr_gw = batadv_gw_get_selected_gw_node(bat_priv);
if (!curr_gw)
return;
/* deselect the current gateway so that next time that client mode is
* enabled a proper GW_ADD event can be sent
*/
batadv_gw_select(bat_priv, NULL);
/* if batman-adv is switching the gw client mode off and a gateway was
* already selected, send a DEL uevent
*/
batadv_throw_uevent(bat_priv, BATADV_UEV_GW, BATADV_UEV_DEL, NULL);
batadv_gw_node_put(curr_gw);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Antonio Quartulli | 67 | 98.53% | 3 | 75.00% |
| Sven Eckelmann | 1 | 1.47% | 1 | 25.00% |
| Total | 68 | 100.00% | 4 | 100.00% |
void batadv_gw_election(struct batadv_priv *bat_priv)
{
struct batadv_gw_node *curr_gw = NULL;
struct batadv_gw_node *next_gw = NULL;
struct batadv_neigh_node *router = NULL;
struct batadv_neigh_ifinfo *router_ifinfo = NULL;
char gw_addr[18] = { '\0' };
if (atomic_read(&bat_priv->gw.mode) != BATADV_GW_MODE_CLIENT)
goto out;
if (!bat_priv->algo_ops->gw.get_best_gw_node)
goto out;
curr_gw = batadv_gw_get_selected_gw_node(bat_priv);
if (!batadv_atomic_dec_not_zero(&bat_priv->gw.reselect) && curr_gw)
goto out;
/* if gw.reselect is set to 1 it means that a previous call to
* gw.is_eligible() said that we have a new best GW, therefore it can
* now be picked from the list and selected
*/
next_gw = bat_priv->algo_ops->gw.get_best_gw_node(bat_priv);
if (curr_gw == next_gw)
goto out;
if (next_gw) {
sprintf(gw_addr, "%pM", next_gw->orig_node->orig);
router = batadv_orig_router_get(next_gw->orig_node,
BATADV_IF_DEFAULT);
if (!router) {
batadv_gw_reselect(bat_priv);
goto out;
}
router_ifinfo = batadv_neigh_ifinfo_get(router,
BATADV_IF_DEFAULT);
if (!router_ifinfo) {
batadv_gw_reselect(bat_priv);
goto out;
}
}
if ((curr_gw) && (!next_gw)) {
batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
"Removing selected gateway - no gateway in range\n");
batadv_throw_uevent(bat_priv, BATADV_UEV_GW, BATADV_UEV_DEL,
NULL);
} else if ((!curr_gw) && (next_gw)) {
batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
"Adding route to gateway %pM (bandwidth: %u.%u/%u.%u MBit, tq: %i)\n",
next_gw->orig_node->orig,
next_gw->bandwidth_down / 10,
next_gw->bandwidth_down % 10,
next_gw->bandwidth_up / 10,
next_gw->bandwidth_up % 10,
router_ifinfo->bat_iv.tq_avg);
batadv_throw_uevent(bat_priv, BATADV_UEV_GW, BATADV_UEV_ADD,
gw_addr);
} else {
batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
"Changing route to gateway %pM (bandwidth: %u.%u/%u.%u MBit, tq: %i)\n",
next_gw->orig_node->orig,
next_gw->bandwidth_down / 10,
next_gw->bandwidth_down % 10,
next_gw->bandwidth_up / 10,
next_gw->bandwidth_up % 10,
router_ifinfo->bat_iv.tq_avg);
batadv_throw_uevent(bat_priv, BATADV_UEV_GW, BATADV_UEV_CHANGE,
gw_addr);
}
batadv_gw_select(bat_priv, next_gw);
out:
if (curr_gw)
batadv_gw_node_put(curr_gw);
if (next_gw)
batadv_gw_node_put(next_gw);
if (router)
batadv_neigh_node_put(router);
if (router_ifinfo)
batadv_neigh_ifinfo_put(router_ifinfo);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Antonio Quartulli | 181 | 44.91% | 6 | 23.08% |
| Sven Eckelmann | 105 | 26.05% | 14 | 53.85% |
| Marek Lindner | 59 | 14.64% | 3 | 11.54% |
| Simon Wunderlich | 44 | 10.92% | 2 | 7.69% |
| Linus Lüssing | 14 | 3.47% | 1 | 3.85% |
| Total | 403 | 100.00% | 26 | 100.00% |
void batadv_gw_check_election(struct batadv_priv *bat_priv,
struct batadv_orig_node *orig_node)
{
struct batadv_orig_node *curr_gw_orig;
/* abort immediately if the routing algorithm does not support gateway
* election
*/
if (!bat_priv->algo_ops->gw.is_eligible)
return;
curr_gw_orig = batadv_gw_get_selected_orig(bat_priv);
if (!curr_gw_orig)
goto reselect;
/* this node already is the gateway */
if (curr_gw_orig == orig_node)
goto out;
if (!bat_priv->algo_ops->gw.is_eligible(bat_priv, curr_gw_orig,
orig_node))
goto out;
reselect:
batadv_gw_reselect(bat_priv);
out:
if (curr_gw_orig)
batadv_orig_node_put(curr_gw_orig);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Sven Eckelmann | 41 | 42.27% | 4 | 36.36% |
| Antonio Quartulli | 23 | 23.71% | 3 | 27.27% |
| Linus Lüssing | 19 | 19.59% | 3 | 27.27% |
| Simon Wunderlich | 14 | 14.43% | 1 | 9.09% |
| Total | 97 | 100.00% | 11 | 100.00% |
/**
* batadv_gw_node_add - add gateway node to list of available gateways
* @bat_priv: the bat priv with all the soft interface information
* @orig_node: originator announcing gateway capabilities
* @gateway: announced bandwidth information
*/
static void batadv_gw_node_add(struct batadv_priv *bat_priv,
struct batadv_orig_node *orig_node,
struct batadv_tvlv_gateway_data *gateway)
{
struct batadv_gw_node *gw_node;
if (gateway->bandwidth_down == 0)
return;
gw_node = kzalloc(sizeof(*gw_node), GFP_ATOMIC);
if (!gw_node)
return;
kref_init(&gw_node->refcount);
INIT_HLIST_NODE(&gw_node->list);
kref_get(&orig_node->refcount);
gw_node->orig_node = orig_node;
gw_node->bandwidth_down = ntohl(gateway->bandwidth_down);
gw_node->bandwidth_up = ntohl(gateway->bandwidth_up);
spin_lock_bh(&bat_priv->gw.list_lock);
kref_get(&gw_node->refcount);
hlist_add_head_rcu(&gw_node->list, &bat_priv->gw.gateway_list);
spin_unlock_bh(&bat_priv->gw.list_lock);
batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
"Found new gateway %pM -> gw bandwidth: %u.%u/%u.%u MBit\n",
orig_node->orig,
ntohl(gateway->bandwidth_down) / 10,
ntohl(gateway->bandwidth_down) % 10,
ntohl(gateway->bandwidth_up) / 10,
ntohl(gateway->bandwidth_up) % 10);
/* don't return reference to new gw_node */
batadv_gw_node_put(gw_node);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Sven Eckelmann | 132 | 64.71% | 12 | 80.00% |
| Marek Lindner | 47 | 23.04% | 1 | 6.67% |
| Simon Wunderlich | 22 | 10.78% | 1 | 6.67% |
| Antonio Quartulli | 3 | 1.47% | 1 | 6.67% |
| Total | 204 | 100.00% | 15 | 100.00% |
/**
* batadv_gw_node_get - retrieve gateway node from list of available gateways
* @bat_priv: the bat priv with all the soft interface information
* @orig_node: originator announcing gateway capabilities
*
* Return: gateway node if found or NULL otherwise.
*/
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;
rcu_read_lock();
hlist_for_each_entry_rcu(gw_node_tmp, &bat_priv->gw.gateway_list,
list) {
if (gw_node_tmp->orig_node != orig_node)
continue;
if (!kref_get_unless_zero(&gw_node_tmp->refcount))
continue;
gw_node = gw_node_tmp;
break;
}
rcu_read_unlock();
return gw_node;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Marek Lindner | 67 | 93.06% | 1 | 25.00% |
| Sven Eckelmann | 5 | 6.94% | 3 | 75.00% |
| Total | 72 | 100.00% | 4 | 100.00% |
/**
* batadv_gw_node_update - update list of available gateways with changed
* bandwidth information
* @bat_priv: the bat priv with all the soft interface information
* @orig_node: originator announcing gateway capabilities
* @gateway: announced bandwidth information
*/
void batadv_gw_node_update(struct batadv_priv *bat_priv,
struct batadv_orig_node *orig_node,
struct batadv_tvlv_gateway_data *gateway)
{
struct batadv_gw_node *gw_node, *curr_gw = NULL;
gw_node = batadv_gw_node_get(bat_priv, orig_node);
if (!gw_node) {
batadv_gw_node_add(bat_priv, orig_node, gateway);
goto out;
}
if ((gw_node->bandwidth_down == ntohl(gateway->bandwidth_down)) &&
(gw_node->bandwidth_up == ntohl(gateway->bandwidth_up)))
goto out;
batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
"Gateway bandwidth of originator %pM changed from %u.%u/%u.%u MBit to %u.%u/%u.%u MBit\n",
orig_node->orig,
gw_node->bandwidth_down / 10,
gw_node->bandwidth_down % 10,
gw_node->bandwidth_up / 10,
gw_node->bandwidth_up % 10,
ntohl(gateway->bandwidth_down) / 10,
ntohl(gateway->bandwidth_down) % 10,
ntohl(gateway->bandwidth_up) / 10,
ntohl(gateway->bandwidth_up) % 10);
gw_node->bandwidth_down = ntohl(gateway->bandwidth_down);
gw_node->bandwidth_up = ntohl(gateway->bandwidth_up);
if (ntohl(gateway->bandwidth_down) == 0) {
batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
"Gateway %pM removed from gateway list\n",
orig_node->orig);
/* Note: We don't need a NULL check here, since curr_gw never
* gets dereferenced.
*/
spin_lock_bh(&bat_priv->gw.list_lock);
if (!hlist_unhashed(&gw_node->list)) {
hlist_del_init_rcu(&gw_node->list);
batadv_gw_node_put(gw_node);
}
spin_unlock_bh(&bat_priv->gw.list_lock);
curr_gw = batadv_gw_get_selected_gw_node(bat_priv);
if (gw_node == curr_gw)
batadv_gw_reselect(bat_priv);
if (curr_gw)
batadv_gw_node_put(curr_gw);
}
out:
if (gw_node)
batadv_gw_node_put(gw_node);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Marek Lindner | 172 | 58.31% | 2 | 18.18% |
| Sven Eckelmann | 91 | 30.85% | 7 | 63.64% |
| Simon Wunderlich | 31 | 10.51% | 1 | 9.09% |
| Antonio Quartulli | 1 | 0.34% | 1 | 9.09% |
| Total | 295 | 100.00% | 11 | 100.00% |
void batadv_gw_node_delete(struct batadv_priv *bat_priv,
struct batadv_orig_node *orig_node)
{
struct batadv_tvlv_gateway_data gateway;
gateway.bandwidth_down = 0;
gateway.bandwidth_up = 0;
batadv_gw_node_update(bat_priv, orig_node, &gateway);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Sven Eckelmann | 23 | 56.10% | 4 | 80.00% |
| Marek Lindner | 18 | 43.90% | 1 | 20.00% |
| Total | 41 | 100.00% | 5 | 100.00% |
void batadv_gw_node_free(struct batadv_priv *bat_priv)
{
struct batadv_gw_node *gw_node;
struct hlist_node *node_tmp;
spin_lock_bh(&bat_priv->gw.list_lock);
hlist_for_each_entry_safe(gw_node, node_tmp,
&bat_priv->gw.gateway_list, list) {
hlist_del_init_rcu(&gw_node->list);
batadv_gw_node_put(gw_node);
}
spin_unlock_bh(&bat_priv->gw.list_lock);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Sven Eckelmann | 63 | 96.92% | 5 | 83.33% |
| Simon Wunderlich | 2 | 3.08% | 1 | 16.67% |
| Total | 65 | 100.00% | 6 | 100.00% |
#ifdef CONFIG_BATMAN_ADV_DEBUGFS
int batadv_gw_client_seq_print_text(struct seq_file *seq, void *offset)
{
struct net_device *net_dev = (struct net_device *)seq->private;
struct batadv_priv *bat_priv = netdev_priv(net_dev);
struct batadv_hard_iface *primary_if;
primary_if = batadv_seq_print_text_primary_if_get(seq);
if (!primary_if)
return 0;
seq_printf(seq, "[B.A.T.M.A.N. adv %s, MainIF/MAC: %s/%pM (%s %s)]\n",
BATADV_SOURCE_VERSION, primary_if->net_dev->name,
primary_if->net_dev->dev_addr, net_dev->name,
bat_priv->algo_ops->name);
batadv_hardif_put(primary_if);
if (!bat_priv->algo_ops->gw.print) {
seq_puts(seq,
"No printing function for this routing protocol\n");
return 0;
}
bat_priv->algo_ops->gw.print(bat_priv, seq);
return 0;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Sven Eckelmann | 84 | 63.16% | 4 | 50.00% |
| Antonio Quartulli | 37 | 27.82% | 2 | 25.00% |
| Marek Lindner | 12 | 9.02% | 2 | 25.00% |
| Total | 133 | 100.00% | 8 | 100.00% |
#endif
/**
* batadv_gw_dump - Dump gateways into a message
* @msg: Netlink message to dump into
* @cb: Control block containing additional options
*
* Return: Error code, or length of message
*/
int batadv_gw_dump(struct sk_buff *msg, struct netlink_callback *cb)
{
struct batadv_hard_iface *primary_if = NULL;
struct net *net = sock_net(cb->skb->sk);
struct net_device *soft_iface;
struct batadv_priv *bat_priv;
int ifindex;
int ret;
ifindex = batadv_netlink_get_ifindex(cb->nlh,
BATADV_ATTR_MESH_IFINDEX);
if (!ifindex)
return -EINVAL;
soft_iface = dev_get_by_index(net, ifindex);
if (!soft_iface || !batadv_softif_is_valid(soft_iface)) {
ret = -ENODEV;
goto out;
}
bat_priv = netdev_priv(soft_iface);
primary_if = batadv_primary_if_get_selected(bat_priv);
if (!primary_if || primary_if->if_status != BATADV_IF_ACTIVE) {
ret = -ENOENT;
goto out;
}
if (!bat_priv->algo_ops->gw.dump) {
ret = -EOPNOTSUPP;
goto out;
}
bat_priv->algo_ops->gw.dump(msg, cb, bat_priv);
ret = msg->len;
out:
if (primary_if)
batadv_hardif_put(primary_if);
if (soft_iface)
dev_put(soft_iface);
return ret;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Sven Eckelmann | 202 | 100.00% | 1 | 100.00% |
| Total | 202 | 100.00% | 1 | 100.00% |
/**
* batadv_gw_dhcp_recipient_get - check if a packet is a DHCP message
* @skb: the packet to check
* @header_len: a pointer to the batman-adv header size
* @chaddr: buffer where the client address will be stored. Valid
* only if the function returns BATADV_DHCP_TO_CLIENT
*
* This function may re-allocate the data buffer of the skb passed as argument.
*
* Return:
* - BATADV_DHCP_NO if the packet is not a dhcp message or if there was an error
* while parsing it
* - BATADV_DHCP_TO_SERVER if this is a message going to the DHCP server
* - BATADV_DHCP_TO_CLIENT if this is a message going to a DHCP client
*/
enum batadv_dhcp_recipient
batadv_gw_dhcp_recipient_get(struct sk_buff *skb, unsigned int *header_len,
u8 *chaddr)
{
enum batadv_dhcp_recipient ret = BATADV_DHCP_NO;
struct ethhdr *ethhdr;
struct iphdr *iphdr;
struct ipv6hdr *ipv6hdr;
struct udphdr *udphdr;
struct vlan_ethhdr *vhdr;
int chaddr_offset;
__be16 proto;
u8 *p;
/* check for ethernet header */
if (!pskb_may_pull(skb, *header_len + ETH_HLEN))
return BATADV_DHCP_NO;
ethhdr = eth_hdr(skb);
proto = ethhdr->h_proto;
*header_len += ETH_HLEN;
/* check for initial vlan header */
if (proto == htons(ETH_P_8021Q)) {
if (!pskb_may_pull(skb, *header_len + VLAN_HLEN))
return BATADV_DHCP_NO;
vhdr = vlan_eth_hdr(skb);
proto = vhdr->h_vlan_encapsulated_proto;
*header_len += VLAN_HLEN;
}
/* check for ip header */
switch (proto) {
case htons(ETH_P_IP):
if (!pskb_may_pull(skb, *header_len + sizeof(*iphdr)))
return BATADV_DHCP_NO;
iphdr = (struct iphdr *)(skb->data + *header_len);
*header_len += iphdr->ihl * 4;
/* check for udp header */
if (iphdr->protocol != IPPROTO_UDP)
return BATADV_DHCP_NO;
break;
case htons(ETH_P_IPV6):
if (!pskb_may_pull(skb, *header_len + sizeof(*ipv6hdr)))
return BATADV_DHCP_NO;
ipv6hdr = (struct ipv6hdr *)(skb->data + *header_len);
*header_len += sizeof(*ipv6hdr);
/* check for udp header */
if (ipv6hdr->nexthdr != IPPROTO_UDP)
return BATADV_DHCP_NO;
break;
default:
return BATADV_DHCP_NO;
}
if (!pskb_may_pull(skb, *header_len + sizeof(*udphdr)))
return BATADV_DHCP_NO;
udphdr = (struct udphdr *)(skb->data + *header_len);
*header_len += sizeof(*udphdr);
/* check for bootp port */
switch (proto) {
case htons(ETH_P_IP):
if (udphdr->dest == htons(67))
ret = BATADV_DHCP_TO_SERVER;
else if (udphdr->source == htons(67))
ret = BATADV_DHCP_TO_CLIENT;
break;
case htons(ETH_P_IPV6):
if (udphdr->dest == htons(547))
ret = BATADV_DHCP_TO_SERVER;
else if (udphdr->source == htons(547))
ret = BATADV_DHCP_TO_CLIENT;
break;
}
chaddr_offset = *header_len + BATADV_DHCP_CHADDR_OFFSET;
/* store the client address if the message is going to a client */
if (ret == BATADV_DHCP_TO_CLIENT &&
pskb_may_pull(skb, chaddr_offset + ETH_ALEN)) {
/* check if the DHCP packet carries an Ethernet DHCP */
p = skb->data + *header_len + BATADV_DHCP_HTYPE_OFFSET;
if (*p != BATADV_DHCP_HTYPE_ETHERNET)
return BATADV_DHCP_NO;
/* check if the DHCP packet carries a valid Ethernet address */
p = skb->data + *header_len + BATADV_DHCP_HLEN_OFFSET;
if (*p != ETH_ALEN)
return BATADV_DHCP_NO;
ether_addr_copy(chaddr, skb->data + chaddr_offset);
}
return ret;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Sven Eckelmann | 258 | 52.44% | 3 | 30.00% |
| Antonio Quartulli | 212 | 43.09% | 5 | 50.00% |
| Marek Lindner | 16 | 3.25% | 1 | 10.00% |
| Linus Lüssing | 6 | 1.22% | 1 | 10.00% |
| Total | 492 | 100.00% | 10 | 100.00% |
/**
* batadv_gw_out_of_range - check if the dhcp request destination is the best gw
* @bat_priv: the bat priv with all the soft interface information
* @skb: the outgoing packet
*
* Check if the skb is a DHCP request and if it is sent to the current best GW
* server. Due to topology changes it may be the case that the GW server
* previously selected is not the best one anymore.
*
* This call might reallocate skb data.
* Must be invoked only when the DHCP packet is going TO a DHCP SERVER.
*
* Return: true if the packet destination is unicast and it is not the best gw,
* false otherwise.
*/
bool batadv_gw_out_of_range(struct batadv_priv *bat_priv,
struct sk_buff *skb)
{
struct batadv_neigh_node *neigh_curr = NULL;
struct batadv_neigh_node *neigh_old = NULL;
struct batadv_orig_node *orig_dst_node;
struct batadv_gw_node *gw_node = NULL;
struct batadv_gw_node *curr_gw = NULL;
struct batadv_neigh_ifinfo *curr_ifinfo, *old_ifinfo;
struct ethhdr *ethhdr = (struct ethhdr *)skb->data;
bool out_of_range = false;
u8 curr_tq_avg;
unsigned short vid;
vid = batadv_get_vid(skb, 0);
orig_dst_node = batadv_transtable_search(bat_priv, ethhdr->h_source,
ethhdr->h_dest, vid);
if (!orig_dst_node)
goto out;
gw_node = batadv_gw_node_get(bat_priv, orig_dst_node);
if (!gw_node)
goto out;
switch (atomic_read(&bat_priv->gw.mode)) {
case BATADV_GW_MODE_SERVER:
/* If we are a GW then we are our best GW. We can artificially
* set the tq towards ourself as the maximum value
*/
curr_tq_avg = BATADV_TQ_MAX_VALUE;
break;
case BATADV_GW_MODE_CLIENT:
curr_gw = batadv_gw_get_selected_gw_node(bat_priv);
if (!curr_gw)
goto out;
/* packet is going to our gateway */
if (curr_gw->orig_node == orig_dst_node)
goto out;
/* If the dhcp packet has been sent to a different gw,
* we have to evaluate whether the old gw is still
* reliable enough
*/
neigh_curr = batadv_find_router(bat_priv, curr_gw->orig_node,
NULL);
if (!neigh_curr)
goto out;
curr_ifinfo = batadv_neigh_ifinfo_get(neigh_curr,
BATADV_IF_DEFAULT);
if (!curr_ifinfo)
goto out;
curr_tq_avg = curr_ifinfo->bat_iv.tq_avg;
batadv_neigh_ifinfo_put(curr_ifinfo);
break;
case BATADV_GW_MODE_OFF:
default:
goto out;
}
neigh_old = batadv_find_router(bat_priv, orig_dst_node, NULL);
if (!neigh_old)
goto out;
old_ifinfo = batadv_neigh_ifinfo_get(neigh_old, BATADV_IF_DEFAULT);
if (!old_ifinfo)
goto out;
if ((curr_tq_avg - old_ifinfo->bat_iv.tq_avg) > BATADV_GW_THRESHOLD)
out_of_range = true;
batadv_neigh_ifinfo_put(old_ifinfo);
out:
if (orig_dst_node)
batadv_orig_node_put(orig_dst_node);
if (curr_gw)
batadv_gw_node_put(curr_gw);
if (gw_node)
batadv_gw_node_put(gw_node);
if (neigh_old)
batadv_neigh_node_put(neigh_old);
if (neigh_curr)
batadv_neigh_node_put(neigh_curr);
return out_of_range;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Marek Lindner | 163 | 45.92% | 3 | 11.11% |
| Antonio Quartulli | 86 | 24.23% | 6 | 22.22% |
| Simon Wunderlich | 54 | 15.21% | 1 | 3.70% |
| Sven Eckelmann | 45 | 12.68% | 15 | 55.56% |
| Linus Lüssing | 7 | 1.97% | 2 | 7.41% |
| Total | 355 | 100.00% | 27 | 100.00% |
Overall Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Sven Eckelmann | 1324 | 45.73% | 38 | 50.67% |
| Marek Lindner | 654 | 22.59% | 8 | 10.67% |
| Antonio Quartulli | 647 | 22.35% | 17 | 22.67% |
| Simon Wunderlich | 167 | 5.77% | 4 | 5.33% |
| Linus Lüssing | 101 | 3.49% | 7 | 9.33% |
| Paul E. McKenney | 2 | 0.07% | 1 | 1.33% |
| Total | 2895 | 100.00% | 75 | 100.00% |
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