mirror of https://gitee.com/openkylin/linux.git
1980 lines
60 KiB
C
1980 lines
60 KiB
C
/* Copyright (C) 2007-2014 B.A.T.M.A.N. contributors:
|
|
*
|
|
* Marek Lindner, Simon Wunderlich
|
|
*
|
|
* 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 "main.h"
|
|
#include "translation-table.h"
|
|
#include "originator.h"
|
|
#include "routing.h"
|
|
#include "gateway_common.h"
|
|
#include "gateway_client.h"
|
|
#include "hard-interface.h"
|
|
#include "send.h"
|
|
#include "bat_algo.h"
|
|
#include "network-coding.h"
|
|
|
|
/**
|
|
* enum batadv_dup_status - duplicate status
|
|
* @BATADV_NO_DUP: the packet is a duplicate
|
|
* @BATADV_ORIG_DUP: OGM is a duplicate in the originator (but not for the
|
|
* neighbor)
|
|
* @BATADV_NEIGH_DUP: OGM is a duplicate for the neighbor
|
|
* @BATADV_PROTECTED: originator is currently protected (after reboot)
|
|
*/
|
|
enum batadv_dup_status {
|
|
BATADV_NO_DUP = 0,
|
|
BATADV_ORIG_DUP,
|
|
BATADV_NEIGH_DUP,
|
|
BATADV_PROTECTED,
|
|
};
|
|
|
|
/**
|
|
* batadv_ring_buffer_set - update the ring buffer with the given value
|
|
* @lq_recv: pointer to the ring buffer
|
|
* @lq_index: index to store the value at
|
|
* @value: value to store in the ring buffer
|
|
*/
|
|
static void batadv_ring_buffer_set(uint8_t lq_recv[], uint8_t *lq_index,
|
|
uint8_t value)
|
|
{
|
|
lq_recv[*lq_index] = value;
|
|
*lq_index = (*lq_index + 1) % BATADV_TQ_GLOBAL_WINDOW_SIZE;
|
|
}
|
|
|
|
/**
|
|
* batadv_ring_buffer_set - compute the average of all non-zero values stored
|
|
* in the given ring buffer
|
|
* @lq_recv: pointer to the ring buffer
|
|
*
|
|
* Returns computed average value.
|
|
*/
|
|
static uint8_t batadv_ring_buffer_avg(const uint8_t lq_recv[])
|
|
{
|
|
const uint8_t *ptr;
|
|
uint16_t count = 0, i = 0, sum = 0;
|
|
|
|
ptr = lq_recv;
|
|
|
|
while (i < BATADV_TQ_GLOBAL_WINDOW_SIZE) {
|
|
if (*ptr != 0) {
|
|
count++;
|
|
sum += *ptr;
|
|
}
|
|
|
|
i++;
|
|
ptr++;
|
|
}
|
|
|
|
if (count == 0)
|
|
return 0;
|
|
|
|
return (uint8_t)(sum / count);
|
|
}
|
|
|
|
/**
|
|
* batadv_iv_ogm_orig_free - free the private resources allocated for this
|
|
* orig_node
|
|
* @orig_node: the orig_node for which the resources have to be free'd
|
|
*/
|
|
static void batadv_iv_ogm_orig_free(struct batadv_orig_node *orig_node)
|
|
{
|
|
kfree(orig_node->bat_iv.bcast_own);
|
|
kfree(orig_node->bat_iv.bcast_own_sum);
|
|
}
|
|
|
|
/**
|
|
* batadv_iv_ogm_orig_add_if - change the private structures of the orig_node to
|
|
* include the new hard-interface
|
|
* @orig_node: the orig_node that has to be changed
|
|
* @max_if_num: the current amount of interfaces
|
|
*
|
|
* Returns 0 on success, a negative error code otherwise.
|
|
*/
|
|
static int batadv_iv_ogm_orig_add_if(struct batadv_orig_node *orig_node,
|
|
int max_if_num)
|
|
{
|
|
void *data_ptr;
|
|
size_t old_size;
|
|
int ret = -ENOMEM;
|
|
|
|
spin_lock_bh(&orig_node->bat_iv.ogm_cnt_lock);
|
|
|
|
old_size = (max_if_num - 1) * sizeof(unsigned long) * BATADV_NUM_WORDS;
|
|
data_ptr = kmalloc_array(max_if_num,
|
|
BATADV_NUM_WORDS * sizeof(unsigned long),
|
|
GFP_ATOMIC);
|
|
if (!data_ptr)
|
|
goto unlock;
|
|
|
|
memcpy(data_ptr, orig_node->bat_iv.bcast_own, old_size);
|
|
kfree(orig_node->bat_iv.bcast_own);
|
|
orig_node->bat_iv.bcast_own = data_ptr;
|
|
|
|
data_ptr = kmalloc_array(max_if_num, sizeof(uint8_t), GFP_ATOMIC);
|
|
if (!data_ptr) {
|
|
kfree(orig_node->bat_iv.bcast_own);
|
|
goto unlock;
|
|
}
|
|
|
|
memcpy(data_ptr, orig_node->bat_iv.bcast_own_sum,
|
|
(max_if_num - 1) * sizeof(uint8_t));
|
|
kfree(orig_node->bat_iv.bcast_own_sum);
|
|
orig_node->bat_iv.bcast_own_sum = data_ptr;
|
|
|
|
ret = 0;
|
|
|
|
unlock:
|
|
spin_unlock_bh(&orig_node->bat_iv.ogm_cnt_lock);
|
|
|
|
return ret;
|
|
}
|
|
|
|
/**
|
|
* batadv_iv_ogm_orig_del_if - change the private structures of the orig_node to
|
|
* exclude the removed interface
|
|
* @orig_node: the orig_node that has to be changed
|
|
* @max_if_num: the current amount of interfaces
|
|
* @del_if_num: the index of the interface being removed
|
|
*
|
|
* Returns 0 on success, a negative error code otherwise.
|
|
*/
|
|
static int batadv_iv_ogm_orig_del_if(struct batadv_orig_node *orig_node,
|
|
int max_if_num, int del_if_num)
|
|
{
|
|
int chunk_size, ret = -ENOMEM, if_offset;
|
|
void *data_ptr = NULL;
|
|
|
|
spin_lock_bh(&orig_node->bat_iv.ogm_cnt_lock);
|
|
|
|
/* last interface was removed */
|
|
if (max_if_num == 0)
|
|
goto free_bcast_own;
|
|
|
|
chunk_size = sizeof(unsigned long) * BATADV_NUM_WORDS;
|
|
data_ptr = kmalloc_array(max_if_num, chunk_size, GFP_ATOMIC);
|
|
if (!data_ptr)
|
|
goto unlock;
|
|
|
|
/* copy first part */
|
|
memcpy(data_ptr, orig_node->bat_iv.bcast_own, del_if_num * chunk_size);
|
|
|
|
/* copy second part */
|
|
memcpy((char *)data_ptr + del_if_num * chunk_size,
|
|
orig_node->bat_iv.bcast_own + ((del_if_num + 1) * chunk_size),
|
|
(max_if_num - del_if_num) * chunk_size);
|
|
|
|
free_bcast_own:
|
|
kfree(orig_node->bat_iv.bcast_own);
|
|
orig_node->bat_iv.bcast_own = data_ptr;
|
|
|
|
if (max_if_num == 0)
|
|
goto free_own_sum;
|
|
|
|
data_ptr = kmalloc_array(max_if_num, sizeof(uint8_t), GFP_ATOMIC);
|
|
if (!data_ptr) {
|
|
kfree(orig_node->bat_iv.bcast_own);
|
|
goto unlock;
|
|
}
|
|
|
|
memcpy(data_ptr, orig_node->bat_iv.bcast_own_sum,
|
|
del_if_num * sizeof(uint8_t));
|
|
|
|
if_offset = (del_if_num + 1) * sizeof(uint8_t);
|
|
memcpy((char *)data_ptr + del_if_num * sizeof(uint8_t),
|
|
orig_node->bat_iv.bcast_own_sum + if_offset,
|
|
(max_if_num - del_if_num) * sizeof(uint8_t));
|
|
|
|
free_own_sum:
|
|
kfree(orig_node->bat_iv.bcast_own_sum);
|
|
orig_node->bat_iv.bcast_own_sum = data_ptr;
|
|
|
|
ret = 0;
|
|
unlock:
|
|
spin_unlock_bh(&orig_node->bat_iv.ogm_cnt_lock);
|
|
|
|
return ret;
|
|
}
|
|
|
|
/**
|
|
* batadv_iv_ogm_orig_get - retrieve or create (if does not exist) an originator
|
|
* @bat_priv: the bat priv with all the soft interface information
|
|
* @addr: mac address of the originator
|
|
*
|
|
* Returns the originator object corresponding to the passed mac address or NULL
|
|
* on failure.
|
|
* If the object does not exists it is created an initialised.
|
|
*/
|
|
static struct batadv_orig_node *
|
|
batadv_iv_ogm_orig_get(struct batadv_priv *bat_priv, const uint8_t *addr)
|
|
{
|
|
struct batadv_orig_node *orig_node;
|
|
int size, hash_added;
|
|
|
|
orig_node = batadv_orig_hash_find(bat_priv, addr);
|
|
if (orig_node)
|
|
return orig_node;
|
|
|
|
orig_node = batadv_orig_node_new(bat_priv, addr);
|
|
if (!orig_node)
|
|
return NULL;
|
|
|
|
spin_lock_init(&orig_node->bat_iv.ogm_cnt_lock);
|
|
|
|
size = bat_priv->num_ifaces * sizeof(unsigned long) * BATADV_NUM_WORDS;
|
|
orig_node->bat_iv.bcast_own = kzalloc(size, GFP_ATOMIC);
|
|
if (!orig_node->bat_iv.bcast_own)
|
|
goto free_orig_node;
|
|
|
|
size = bat_priv->num_ifaces * sizeof(uint8_t);
|
|
orig_node->bat_iv.bcast_own_sum = kzalloc(size, GFP_ATOMIC);
|
|
if (!orig_node->bat_iv.bcast_own_sum)
|
|
goto free_orig_node;
|
|
|
|
hash_added = batadv_hash_add(bat_priv->orig_hash, batadv_compare_orig,
|
|
batadv_choose_orig, orig_node,
|
|
&orig_node->hash_entry);
|
|
if (hash_added != 0)
|
|
goto free_orig_node;
|
|
|
|
return orig_node;
|
|
|
|
free_orig_node:
|
|
/* free twice, as batadv_orig_node_new sets refcount to 2 */
|
|
batadv_orig_node_free_ref(orig_node);
|
|
batadv_orig_node_free_ref(orig_node);
|
|
|
|
return NULL;
|
|
}
|
|
|
|
static struct batadv_neigh_node *
|
|
batadv_iv_ogm_neigh_new(struct batadv_hard_iface *hard_iface,
|
|
const uint8_t *neigh_addr,
|
|
struct batadv_orig_node *orig_node,
|
|
struct batadv_orig_node *orig_neigh)
|
|
{
|
|
struct batadv_priv *bat_priv = netdev_priv(hard_iface->soft_iface);
|
|
struct batadv_neigh_node *neigh_node, *tmp_neigh_node;
|
|
|
|
neigh_node = batadv_neigh_node_new(hard_iface, neigh_addr, orig_node);
|
|
if (!neigh_node)
|
|
goto out;
|
|
|
|
if (!atomic_inc_not_zero(&hard_iface->refcount)) {
|
|
kfree(neigh_node);
|
|
neigh_node = NULL;
|
|
goto out;
|
|
}
|
|
|
|
neigh_node->orig_node = orig_neigh;
|
|
neigh_node->if_incoming = hard_iface;
|
|
|
|
spin_lock_bh(&orig_node->neigh_list_lock);
|
|
tmp_neigh_node = batadv_neigh_node_get(orig_node, hard_iface,
|
|
neigh_addr);
|
|
if (!tmp_neigh_node) {
|
|
hlist_add_head_rcu(&neigh_node->list, &orig_node->neigh_list);
|
|
} else {
|
|
kfree(neigh_node);
|
|
batadv_hardif_free_ref(hard_iface);
|
|
neigh_node = tmp_neigh_node;
|
|
}
|
|
spin_unlock_bh(&orig_node->neigh_list_lock);
|
|
|
|
if (!tmp_neigh_node)
|
|
batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
|
|
"Creating new neighbor %pM for orig_node %pM on interface %s\n",
|
|
neigh_addr, orig_node->orig,
|
|
hard_iface->net_dev->name);
|
|
|
|
out:
|
|
return neigh_node;
|
|
}
|
|
|
|
static int batadv_iv_ogm_iface_enable(struct batadv_hard_iface *hard_iface)
|
|
{
|
|
struct batadv_ogm_packet *batadv_ogm_packet;
|
|
unsigned char *ogm_buff;
|
|
uint32_t random_seqno;
|
|
int res = -ENOMEM;
|
|
|
|
/* randomize initial seqno to avoid collision */
|
|
get_random_bytes(&random_seqno, sizeof(random_seqno));
|
|
atomic_set(&hard_iface->bat_iv.ogm_seqno, random_seqno);
|
|
|
|
hard_iface->bat_iv.ogm_buff_len = BATADV_OGM_HLEN;
|
|
ogm_buff = kmalloc(hard_iface->bat_iv.ogm_buff_len, GFP_ATOMIC);
|
|
if (!ogm_buff)
|
|
goto out;
|
|
|
|
hard_iface->bat_iv.ogm_buff = ogm_buff;
|
|
|
|
batadv_ogm_packet = (struct batadv_ogm_packet *)ogm_buff;
|
|
batadv_ogm_packet->packet_type = BATADV_IV_OGM;
|
|
batadv_ogm_packet->version = BATADV_COMPAT_VERSION;
|
|
batadv_ogm_packet->ttl = 2;
|
|
batadv_ogm_packet->flags = BATADV_NO_FLAGS;
|
|
batadv_ogm_packet->reserved = 0;
|
|
batadv_ogm_packet->tq = BATADV_TQ_MAX_VALUE;
|
|
|
|
res = 0;
|
|
|
|
out:
|
|
return res;
|
|
}
|
|
|
|
static void batadv_iv_ogm_iface_disable(struct batadv_hard_iface *hard_iface)
|
|
{
|
|
kfree(hard_iface->bat_iv.ogm_buff);
|
|
hard_iface->bat_iv.ogm_buff = NULL;
|
|
}
|
|
|
|
static void batadv_iv_ogm_iface_update_mac(struct batadv_hard_iface *hard_iface)
|
|
{
|
|
struct batadv_ogm_packet *batadv_ogm_packet;
|
|
unsigned char *ogm_buff = hard_iface->bat_iv.ogm_buff;
|
|
|
|
batadv_ogm_packet = (struct batadv_ogm_packet *)ogm_buff;
|
|
ether_addr_copy(batadv_ogm_packet->orig,
|
|
hard_iface->net_dev->dev_addr);
|
|
ether_addr_copy(batadv_ogm_packet->prev_sender,
|
|
hard_iface->net_dev->dev_addr);
|
|
}
|
|
|
|
static void
|
|
batadv_iv_ogm_primary_iface_set(struct batadv_hard_iface *hard_iface)
|
|
{
|
|
struct batadv_ogm_packet *batadv_ogm_packet;
|
|
unsigned char *ogm_buff = hard_iface->bat_iv.ogm_buff;
|
|
|
|
batadv_ogm_packet = (struct batadv_ogm_packet *)ogm_buff;
|
|
batadv_ogm_packet->flags = BATADV_PRIMARIES_FIRST_HOP;
|
|
batadv_ogm_packet->ttl = BATADV_TTL;
|
|
}
|
|
|
|
/* when do we schedule our own ogm to be sent */
|
|
static unsigned long
|
|
batadv_iv_ogm_emit_send_time(const struct batadv_priv *bat_priv)
|
|
{
|
|
unsigned int msecs;
|
|
|
|
msecs = atomic_read(&bat_priv->orig_interval) - BATADV_JITTER;
|
|
msecs += prandom_u32() % (2 * BATADV_JITTER);
|
|
|
|
return jiffies + msecs_to_jiffies(msecs);
|
|
}
|
|
|
|
/* when do we schedule a ogm packet to be sent */
|
|
static unsigned long batadv_iv_ogm_fwd_send_time(void)
|
|
{
|
|
return jiffies + msecs_to_jiffies(prandom_u32() % (BATADV_JITTER / 2));
|
|
}
|
|
|
|
/* apply hop penalty for a normal link */
|
|
static uint8_t batadv_hop_penalty(uint8_t tq,
|
|
const struct batadv_priv *bat_priv)
|
|
{
|
|
int hop_penalty = atomic_read(&bat_priv->hop_penalty);
|
|
int new_tq;
|
|
|
|
new_tq = tq * (BATADV_TQ_MAX_VALUE - hop_penalty);
|
|
new_tq /= BATADV_TQ_MAX_VALUE;
|
|
|
|
return new_tq;
|
|
}
|
|
|
|
/* is there another aggregated packet here? */
|
|
static int batadv_iv_ogm_aggr_packet(int buff_pos, int packet_len,
|
|
__be16 tvlv_len)
|
|
{
|
|
int next_buff_pos = 0;
|
|
|
|
next_buff_pos += buff_pos + BATADV_OGM_HLEN;
|
|
next_buff_pos += ntohs(tvlv_len);
|
|
|
|
return (next_buff_pos <= packet_len) &&
|
|
(next_buff_pos <= BATADV_MAX_AGGREGATION_BYTES);
|
|
}
|
|
|
|
/* send a batman ogm to a given interface */
|
|
static void batadv_iv_ogm_send_to_if(struct batadv_forw_packet *forw_packet,
|
|
struct batadv_hard_iface *hard_iface)
|
|
{
|
|
struct batadv_priv *bat_priv = netdev_priv(hard_iface->soft_iface);
|
|
char *fwd_str;
|
|
uint8_t packet_num;
|
|
int16_t buff_pos;
|
|
struct batadv_ogm_packet *batadv_ogm_packet;
|
|
struct sk_buff *skb;
|
|
uint8_t *packet_pos;
|
|
|
|
if (hard_iface->if_status != BATADV_IF_ACTIVE)
|
|
return;
|
|
|
|
packet_num = 0;
|
|
buff_pos = 0;
|
|
packet_pos = forw_packet->skb->data;
|
|
batadv_ogm_packet = (struct batadv_ogm_packet *)packet_pos;
|
|
|
|
/* adjust all flags and log packets */
|
|
while (batadv_iv_ogm_aggr_packet(buff_pos, forw_packet->packet_len,
|
|
batadv_ogm_packet->tvlv_len)) {
|
|
/* we might have aggregated direct link packets with an
|
|
* ordinary base packet
|
|
*/
|
|
if (forw_packet->direct_link_flags & BIT(packet_num) &&
|
|
forw_packet->if_incoming == hard_iface)
|
|
batadv_ogm_packet->flags |= BATADV_DIRECTLINK;
|
|
else
|
|
batadv_ogm_packet->flags &= ~BATADV_DIRECTLINK;
|
|
|
|
if (packet_num > 0 || !forw_packet->own)
|
|
fwd_str = "Forwarding";
|
|
else
|
|
fwd_str = "Sending own";
|
|
|
|
batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
|
|
"%s %spacket (originator %pM, seqno %u, TQ %d, TTL %d, IDF %s) on interface %s [%pM]\n",
|
|
fwd_str, (packet_num > 0 ? "aggregated " : ""),
|
|
batadv_ogm_packet->orig,
|
|
ntohl(batadv_ogm_packet->seqno),
|
|
batadv_ogm_packet->tq, batadv_ogm_packet->ttl,
|
|
(batadv_ogm_packet->flags & BATADV_DIRECTLINK ?
|
|
"on" : "off"),
|
|
hard_iface->net_dev->name,
|
|
hard_iface->net_dev->dev_addr);
|
|
|
|
buff_pos += BATADV_OGM_HLEN;
|
|
buff_pos += ntohs(batadv_ogm_packet->tvlv_len);
|
|
packet_num++;
|
|
packet_pos = forw_packet->skb->data + buff_pos;
|
|
batadv_ogm_packet = (struct batadv_ogm_packet *)packet_pos;
|
|
}
|
|
|
|
/* create clone because function is called more than once */
|
|
skb = skb_clone(forw_packet->skb, GFP_ATOMIC);
|
|
if (skb) {
|
|
batadv_inc_counter(bat_priv, BATADV_CNT_MGMT_TX);
|
|
batadv_add_counter(bat_priv, BATADV_CNT_MGMT_TX_BYTES,
|
|
skb->len + ETH_HLEN);
|
|
batadv_send_skb_packet(skb, hard_iface, batadv_broadcast_addr);
|
|
}
|
|
}
|
|
|
|
/* send a batman ogm packet */
|
|
static void batadv_iv_ogm_emit(struct batadv_forw_packet *forw_packet)
|
|
{
|
|
struct net_device *soft_iface;
|
|
struct batadv_priv *bat_priv;
|
|
struct batadv_hard_iface *primary_if = NULL;
|
|
|
|
if (!forw_packet->if_incoming) {
|
|
pr_err("Error - can't forward packet: incoming iface not specified\n");
|
|
goto out;
|
|
}
|
|
|
|
soft_iface = forw_packet->if_incoming->soft_iface;
|
|
bat_priv = netdev_priv(soft_iface);
|
|
|
|
if (WARN_ON(!forw_packet->if_outgoing))
|
|
goto out;
|
|
|
|
if (WARN_ON(forw_packet->if_outgoing->soft_iface != soft_iface))
|
|
goto out;
|
|
|
|
if (forw_packet->if_incoming->if_status != BATADV_IF_ACTIVE)
|
|
goto out;
|
|
|
|
primary_if = batadv_primary_if_get_selected(bat_priv);
|
|
if (!primary_if)
|
|
goto out;
|
|
|
|
/* only for one specific outgoing interface */
|
|
batadv_iv_ogm_send_to_if(forw_packet, forw_packet->if_outgoing);
|
|
|
|
out:
|
|
if (primary_if)
|
|
batadv_hardif_free_ref(primary_if);
|
|
}
|
|
|
|
/**
|
|
* batadv_iv_ogm_can_aggregate - find out if an OGM can be aggregated on an
|
|
* existing forward packet
|
|
* @new_bat_ogm_packet: OGM packet to be aggregated
|
|
* @bat_priv: the bat priv with all the soft interface information
|
|
* @packet_len: (total) length of the OGM
|
|
* @send_time: timestamp (jiffies) when the packet is to be sent
|
|
* @directlink: true if this is a direct link packet
|
|
* @if_incoming: interface where the packet was received
|
|
* @if_outgoing: interface for which the retransmission should be considered
|
|
* @forw_packet: the forwarded packet which should be checked
|
|
*
|
|
* Returns true if new_packet can be aggregated with forw_packet
|
|
*/
|
|
static bool
|
|
batadv_iv_ogm_can_aggregate(const struct batadv_ogm_packet *new_bat_ogm_packet,
|
|
struct batadv_priv *bat_priv,
|
|
int packet_len, unsigned long send_time,
|
|
bool directlink,
|
|
const struct batadv_hard_iface *if_incoming,
|
|
const struct batadv_hard_iface *if_outgoing,
|
|
const struct batadv_forw_packet *forw_packet)
|
|
{
|
|
struct batadv_ogm_packet *batadv_ogm_packet;
|
|
int aggregated_bytes = forw_packet->packet_len + packet_len;
|
|
struct batadv_hard_iface *primary_if = NULL;
|
|
bool res = false;
|
|
unsigned long aggregation_end_time;
|
|
|
|
batadv_ogm_packet = (struct batadv_ogm_packet *)forw_packet->skb->data;
|
|
aggregation_end_time = send_time;
|
|
aggregation_end_time += msecs_to_jiffies(BATADV_MAX_AGGREGATION_MS);
|
|
|
|
/* we can aggregate the current packet to this aggregated packet
|
|
* if:
|
|
*
|
|
* - the send time is within our MAX_AGGREGATION_MS time
|
|
* - the resulting packet wont be bigger than
|
|
* MAX_AGGREGATION_BYTES
|
|
*/
|
|
if (time_before(send_time, forw_packet->send_time) &&
|
|
time_after_eq(aggregation_end_time, forw_packet->send_time) &&
|
|
(aggregated_bytes <= BATADV_MAX_AGGREGATION_BYTES)) {
|
|
/* check aggregation compatibility
|
|
* -> direct link packets are broadcasted on
|
|
* their interface only
|
|
* -> aggregate packet if the current packet is
|
|
* a "global" packet as well as the base
|
|
* packet
|
|
*/
|
|
primary_if = batadv_primary_if_get_selected(bat_priv);
|
|
if (!primary_if)
|
|
goto out;
|
|
|
|
/* packet is not leaving on the same interface. */
|
|
if (forw_packet->if_outgoing != if_outgoing)
|
|
goto out;
|
|
|
|
/* packets without direct link flag and high TTL
|
|
* are flooded through the net
|
|
*/
|
|
if ((!directlink) &&
|
|
(!(batadv_ogm_packet->flags & BATADV_DIRECTLINK)) &&
|
|
(batadv_ogm_packet->ttl != 1) &&
|
|
|
|
/* own packets originating non-primary
|
|
* interfaces leave only that interface
|
|
*/
|
|
((!forw_packet->own) ||
|
|
(forw_packet->if_incoming == primary_if))) {
|
|
res = true;
|
|
goto out;
|
|
}
|
|
|
|
/* if the incoming packet is sent via this one
|
|
* interface only - we still can aggregate
|
|
*/
|
|
if ((directlink) &&
|
|
(new_bat_ogm_packet->ttl == 1) &&
|
|
(forw_packet->if_incoming == if_incoming) &&
|
|
|
|
/* packets from direct neighbors or
|
|
* own secondary interface packets
|
|
* (= secondary interface packets in general)
|
|
*/
|
|
(batadv_ogm_packet->flags & BATADV_DIRECTLINK ||
|
|
(forw_packet->own &&
|
|
forw_packet->if_incoming != primary_if))) {
|
|
res = true;
|
|
goto out;
|
|
}
|
|
}
|
|
|
|
out:
|
|
if (primary_if)
|
|
batadv_hardif_free_ref(primary_if);
|
|
return res;
|
|
}
|
|
|
|
/**
|
|
* batadv_iv_ogm_aggregate_new - create a new aggregated packet and add this
|
|
* packet to it.
|
|
* @packet_buff: pointer to the OGM
|
|
* @packet_len: (total) length of the OGM
|
|
* @send_time: timestamp (jiffies) when the packet is to be sent
|
|
* @direct_link: whether this OGM has direct link status
|
|
* @if_incoming: interface where the packet was received
|
|
* @if_outgoing: interface for which the retransmission should be considered
|
|
* @own_packet: true if it is a self-generated ogm
|
|
*/
|
|
static void batadv_iv_ogm_aggregate_new(const unsigned char *packet_buff,
|
|
int packet_len, unsigned long send_time,
|
|
bool direct_link,
|
|
struct batadv_hard_iface *if_incoming,
|
|
struct batadv_hard_iface *if_outgoing,
|
|
int own_packet)
|
|
{
|
|
struct batadv_priv *bat_priv = netdev_priv(if_incoming->soft_iface);
|
|
struct batadv_forw_packet *forw_packet_aggr;
|
|
unsigned char *skb_buff;
|
|
unsigned int skb_size;
|
|
|
|
if (!atomic_inc_not_zero(&if_incoming->refcount))
|
|
return;
|
|
|
|
if (!atomic_inc_not_zero(&if_outgoing->refcount))
|
|
goto out_free_incoming;
|
|
|
|
/* own packet should always be scheduled */
|
|
if (!own_packet) {
|
|
if (!batadv_atomic_dec_not_zero(&bat_priv->batman_queue_left)) {
|
|
batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
|
|
"batman packet queue full\n");
|
|
goto out;
|
|
}
|
|
}
|
|
|
|
forw_packet_aggr = kmalloc(sizeof(*forw_packet_aggr), GFP_ATOMIC);
|
|
if (!forw_packet_aggr) {
|
|
if (!own_packet)
|
|
atomic_inc(&bat_priv->batman_queue_left);
|
|
goto out;
|
|
}
|
|
|
|
if ((atomic_read(&bat_priv->aggregated_ogms)) &&
|
|
(packet_len < BATADV_MAX_AGGREGATION_BYTES))
|
|
skb_size = BATADV_MAX_AGGREGATION_BYTES;
|
|
else
|
|
skb_size = packet_len;
|
|
|
|
skb_size += ETH_HLEN;
|
|
|
|
forw_packet_aggr->skb = netdev_alloc_skb_ip_align(NULL, skb_size);
|
|
if (!forw_packet_aggr->skb) {
|
|
if (!own_packet)
|
|
atomic_inc(&bat_priv->batman_queue_left);
|
|
kfree(forw_packet_aggr);
|
|
goto out;
|
|
}
|
|
forw_packet_aggr->skb->priority = TC_PRIO_CONTROL;
|
|
skb_reserve(forw_packet_aggr->skb, ETH_HLEN);
|
|
|
|
skb_buff = skb_put(forw_packet_aggr->skb, packet_len);
|
|
forw_packet_aggr->packet_len = packet_len;
|
|
memcpy(skb_buff, packet_buff, packet_len);
|
|
|
|
forw_packet_aggr->own = own_packet;
|
|
forw_packet_aggr->if_incoming = if_incoming;
|
|
forw_packet_aggr->if_outgoing = if_outgoing;
|
|
forw_packet_aggr->num_packets = 0;
|
|
forw_packet_aggr->direct_link_flags = BATADV_NO_FLAGS;
|
|
forw_packet_aggr->send_time = send_time;
|
|
|
|
/* save packet direct link flag status */
|
|
if (direct_link)
|
|
forw_packet_aggr->direct_link_flags |= 1;
|
|
|
|
/* add new packet to packet list */
|
|
spin_lock_bh(&bat_priv->forw_bat_list_lock);
|
|
hlist_add_head(&forw_packet_aggr->list, &bat_priv->forw_bat_list);
|
|
spin_unlock_bh(&bat_priv->forw_bat_list_lock);
|
|
|
|
/* start timer for this packet */
|
|
INIT_DELAYED_WORK(&forw_packet_aggr->delayed_work,
|
|
batadv_send_outstanding_bat_ogm_packet);
|
|
queue_delayed_work(batadv_event_workqueue,
|
|
&forw_packet_aggr->delayed_work,
|
|
send_time - jiffies);
|
|
|
|
return;
|
|
out:
|
|
batadv_hardif_free_ref(if_outgoing);
|
|
out_free_incoming:
|
|
batadv_hardif_free_ref(if_incoming);
|
|
}
|
|
|
|
/* aggregate a new packet into the existing ogm packet */
|
|
static void batadv_iv_ogm_aggregate(struct batadv_forw_packet *forw_packet_aggr,
|
|
const unsigned char *packet_buff,
|
|
int packet_len, bool direct_link)
|
|
{
|
|
unsigned char *skb_buff;
|
|
unsigned long new_direct_link_flag;
|
|
|
|
skb_buff = skb_put(forw_packet_aggr->skb, packet_len);
|
|
memcpy(skb_buff, packet_buff, packet_len);
|
|
forw_packet_aggr->packet_len += packet_len;
|
|
forw_packet_aggr->num_packets++;
|
|
|
|
/* save packet direct link flag status */
|
|
if (direct_link) {
|
|
new_direct_link_flag = BIT(forw_packet_aggr->num_packets);
|
|
forw_packet_aggr->direct_link_flags |= new_direct_link_flag;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* batadv_iv_ogm_queue_add - queue up an OGM for transmission
|
|
* @bat_priv: the bat priv with all the soft interface information
|
|
* @packet_buff: pointer to the OGM
|
|
* @packet_len: (total) length of the OGM
|
|
* @if_incoming: interface where the packet was received
|
|
* @if_outgoing: interface for which the retransmission should be considered
|
|
* @own_packet: true if it is a self-generated ogm
|
|
* @send_time: timestamp (jiffies) when the packet is to be sent
|
|
*/
|
|
static void batadv_iv_ogm_queue_add(struct batadv_priv *bat_priv,
|
|
unsigned char *packet_buff,
|
|
int packet_len,
|
|
struct batadv_hard_iface *if_incoming,
|
|
struct batadv_hard_iface *if_outgoing,
|
|
int own_packet, unsigned long send_time)
|
|
{
|
|
/* _aggr -> pointer to the packet we want to aggregate with
|
|
* _pos -> pointer to the position in the queue
|
|
*/
|
|
struct batadv_forw_packet *forw_packet_aggr = NULL;
|
|
struct batadv_forw_packet *forw_packet_pos = NULL;
|
|
struct batadv_ogm_packet *batadv_ogm_packet;
|
|
bool direct_link;
|
|
unsigned long max_aggregation_jiffies;
|
|
|
|
batadv_ogm_packet = (struct batadv_ogm_packet *)packet_buff;
|
|
direct_link = batadv_ogm_packet->flags & BATADV_DIRECTLINK ? 1 : 0;
|
|
max_aggregation_jiffies = msecs_to_jiffies(BATADV_MAX_AGGREGATION_MS);
|
|
|
|
/* find position for the packet in the forward queue */
|
|
spin_lock_bh(&bat_priv->forw_bat_list_lock);
|
|
/* own packets are not to be aggregated */
|
|
if ((atomic_read(&bat_priv->aggregated_ogms)) && (!own_packet)) {
|
|
hlist_for_each_entry(forw_packet_pos,
|
|
&bat_priv->forw_bat_list, list) {
|
|
if (batadv_iv_ogm_can_aggregate(batadv_ogm_packet,
|
|
bat_priv, packet_len,
|
|
send_time, direct_link,
|
|
if_incoming,
|
|
if_outgoing,
|
|
forw_packet_pos)) {
|
|
forw_packet_aggr = forw_packet_pos;
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
/* nothing to aggregate with - either aggregation disabled or no
|
|
* suitable aggregation packet found
|
|
*/
|
|
if (!forw_packet_aggr) {
|
|
/* the following section can run without the lock */
|
|
spin_unlock_bh(&bat_priv->forw_bat_list_lock);
|
|
|
|
/* if we could not aggregate this packet with one of the others
|
|
* we hold it back for a while, so that it might be aggregated
|
|
* later on
|
|
*/
|
|
if (!own_packet && atomic_read(&bat_priv->aggregated_ogms))
|
|
send_time += max_aggregation_jiffies;
|
|
|
|
batadv_iv_ogm_aggregate_new(packet_buff, packet_len,
|
|
send_time, direct_link,
|
|
if_incoming, if_outgoing,
|
|
own_packet);
|
|
} else {
|
|
batadv_iv_ogm_aggregate(forw_packet_aggr, packet_buff,
|
|
packet_len, direct_link);
|
|
spin_unlock_bh(&bat_priv->forw_bat_list_lock);
|
|
}
|
|
}
|
|
|
|
static void batadv_iv_ogm_forward(struct batadv_orig_node *orig_node,
|
|
const struct ethhdr *ethhdr,
|
|
struct batadv_ogm_packet *batadv_ogm_packet,
|
|
bool is_single_hop_neigh,
|
|
bool is_from_best_next_hop,
|
|
struct batadv_hard_iface *if_incoming,
|
|
struct batadv_hard_iface *if_outgoing)
|
|
{
|
|
struct batadv_priv *bat_priv = netdev_priv(if_incoming->soft_iface);
|
|
uint16_t tvlv_len;
|
|
|
|
if (batadv_ogm_packet->ttl <= 1) {
|
|
batadv_dbg(BATADV_DBG_BATMAN, bat_priv, "ttl exceeded\n");
|
|
return;
|
|
}
|
|
|
|
if (!is_from_best_next_hop) {
|
|
/* Mark the forwarded packet when it is not coming from our
|
|
* best next hop. We still need to forward the packet for our
|
|
* neighbor link quality detection to work in case the packet
|
|
* originated from a single hop neighbor. Otherwise we can
|
|
* simply drop the ogm.
|
|
*/
|
|
if (is_single_hop_neigh)
|
|
batadv_ogm_packet->flags |= BATADV_NOT_BEST_NEXT_HOP;
|
|
else
|
|
return;
|
|
}
|
|
|
|
tvlv_len = ntohs(batadv_ogm_packet->tvlv_len);
|
|
|
|
batadv_ogm_packet->ttl--;
|
|
ether_addr_copy(batadv_ogm_packet->prev_sender, ethhdr->h_source);
|
|
|
|
/* apply hop penalty */
|
|
batadv_ogm_packet->tq = batadv_hop_penalty(batadv_ogm_packet->tq,
|
|
bat_priv);
|
|
|
|
batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
|
|
"Forwarding packet: tq: %i, ttl: %i\n",
|
|
batadv_ogm_packet->tq, batadv_ogm_packet->ttl);
|
|
|
|
/* switch of primaries first hop flag when forwarding */
|
|
batadv_ogm_packet->flags &= ~BATADV_PRIMARIES_FIRST_HOP;
|
|
if (is_single_hop_neigh)
|
|
batadv_ogm_packet->flags |= BATADV_DIRECTLINK;
|
|
else
|
|
batadv_ogm_packet->flags &= ~BATADV_DIRECTLINK;
|
|
|
|
batadv_iv_ogm_queue_add(bat_priv, (unsigned char *)batadv_ogm_packet,
|
|
BATADV_OGM_HLEN + tvlv_len,
|
|
if_incoming, if_outgoing, 0,
|
|
batadv_iv_ogm_fwd_send_time());
|
|
}
|
|
|
|
/**
|
|
* batadv_iv_ogm_slide_own_bcast_window - bitshift own OGM broadcast windows for
|
|
* the given interface
|
|
* @hard_iface: the interface for which the windows have to be shifted
|
|
*/
|
|
static void
|
|
batadv_iv_ogm_slide_own_bcast_window(struct batadv_hard_iface *hard_iface)
|
|
{
|
|
struct batadv_priv *bat_priv = netdev_priv(hard_iface->soft_iface);
|
|
struct batadv_hashtable *hash = bat_priv->orig_hash;
|
|
struct hlist_head *head;
|
|
struct batadv_orig_node *orig_node;
|
|
unsigned long *word;
|
|
uint32_t i;
|
|
size_t word_index;
|
|
uint8_t *w;
|
|
int if_num;
|
|
|
|
for (i = 0; i < hash->size; i++) {
|
|
head = &hash->table[i];
|
|
|
|
rcu_read_lock();
|
|
hlist_for_each_entry_rcu(orig_node, head, hash_entry) {
|
|
spin_lock_bh(&orig_node->bat_iv.ogm_cnt_lock);
|
|
word_index = hard_iface->if_num * BATADV_NUM_WORDS;
|
|
word = &orig_node->bat_iv.bcast_own[word_index];
|
|
|
|
batadv_bit_get_packet(bat_priv, word, 1, 0);
|
|
if_num = hard_iface->if_num;
|
|
w = &orig_node->bat_iv.bcast_own_sum[if_num];
|
|
*w = bitmap_weight(word, BATADV_TQ_LOCAL_WINDOW_SIZE);
|
|
spin_unlock_bh(&orig_node->bat_iv.ogm_cnt_lock);
|
|
}
|
|
rcu_read_unlock();
|
|
}
|
|
}
|
|
|
|
static void batadv_iv_ogm_schedule(struct batadv_hard_iface *hard_iface)
|
|
{
|
|
struct batadv_priv *bat_priv = netdev_priv(hard_iface->soft_iface);
|
|
unsigned char **ogm_buff = &hard_iface->bat_iv.ogm_buff;
|
|
struct batadv_ogm_packet *batadv_ogm_packet;
|
|
struct batadv_hard_iface *primary_if, *tmp_hard_iface;
|
|
int *ogm_buff_len = &hard_iface->bat_iv.ogm_buff_len;
|
|
uint32_t seqno;
|
|
uint16_t tvlv_len = 0;
|
|
unsigned long send_time;
|
|
|
|
primary_if = batadv_primary_if_get_selected(bat_priv);
|
|
|
|
if (hard_iface == primary_if) {
|
|
/* tt changes have to be committed before the tvlv data is
|
|
* appended as it may alter the tt tvlv container
|
|
*/
|
|
batadv_tt_local_commit_changes(bat_priv);
|
|
tvlv_len = batadv_tvlv_container_ogm_append(bat_priv, ogm_buff,
|
|
ogm_buff_len,
|
|
BATADV_OGM_HLEN);
|
|
}
|
|
|
|
batadv_ogm_packet = (struct batadv_ogm_packet *)(*ogm_buff);
|
|
batadv_ogm_packet->tvlv_len = htons(tvlv_len);
|
|
|
|
/* change sequence number to network order */
|
|
seqno = (uint32_t)atomic_read(&hard_iface->bat_iv.ogm_seqno);
|
|
batadv_ogm_packet->seqno = htonl(seqno);
|
|
atomic_inc(&hard_iface->bat_iv.ogm_seqno);
|
|
|
|
batadv_iv_ogm_slide_own_bcast_window(hard_iface);
|
|
|
|
send_time = batadv_iv_ogm_emit_send_time(bat_priv);
|
|
|
|
if (hard_iface != primary_if) {
|
|
/* OGMs from secondary interfaces are only scheduled on their
|
|
* respective interfaces.
|
|
*/
|
|
batadv_iv_ogm_queue_add(bat_priv, *ogm_buff, *ogm_buff_len,
|
|
hard_iface, hard_iface, 1, send_time);
|
|
goto out;
|
|
}
|
|
|
|
/* OGMs from primary interfaces are scheduled on all
|
|
* interfaces.
|
|
*/
|
|
rcu_read_lock();
|
|
list_for_each_entry_rcu(tmp_hard_iface, &batadv_hardif_list, list) {
|
|
if (tmp_hard_iface->soft_iface != hard_iface->soft_iface)
|
|
continue;
|
|
batadv_iv_ogm_queue_add(bat_priv, *ogm_buff,
|
|
*ogm_buff_len, hard_iface,
|
|
tmp_hard_iface, 1, send_time);
|
|
}
|
|
rcu_read_unlock();
|
|
|
|
out:
|
|
if (primary_if)
|
|
batadv_hardif_free_ref(primary_if);
|
|
}
|
|
|
|
/**
|
|
* batadv_iv_ogm_orig_update - use OGM to update corresponding data in an
|
|
* originator
|
|
* @bat_priv: the bat priv with all the soft interface information
|
|
* @orig_node: the orig node who originally emitted the ogm packet
|
|
* @orig_ifinfo: ifinfo for the outgoing interface of the orig_node
|
|
* @ethhdr: Ethernet header of the OGM
|
|
* @batadv_ogm_packet: the ogm packet
|
|
* @if_incoming: interface where the packet was received
|
|
* @if_outgoing: interface for which the retransmission should be considered
|
|
* @dup_status: the duplicate status of this ogm packet.
|
|
*/
|
|
static void
|
|
batadv_iv_ogm_orig_update(struct batadv_priv *bat_priv,
|
|
struct batadv_orig_node *orig_node,
|
|
struct batadv_orig_ifinfo *orig_ifinfo,
|
|
const struct ethhdr *ethhdr,
|
|
const struct batadv_ogm_packet *batadv_ogm_packet,
|
|
struct batadv_hard_iface *if_incoming,
|
|
struct batadv_hard_iface *if_outgoing,
|
|
enum batadv_dup_status dup_status)
|
|
{
|
|
struct batadv_neigh_ifinfo *neigh_ifinfo = NULL;
|
|
struct batadv_neigh_ifinfo *router_ifinfo = NULL;
|
|
struct batadv_neigh_node *neigh_node = NULL, *tmp_neigh_node = NULL;
|
|
struct batadv_neigh_node *router = NULL;
|
|
struct batadv_orig_node *orig_node_tmp;
|
|
int if_num;
|
|
uint8_t sum_orig, sum_neigh;
|
|
uint8_t *neigh_addr;
|
|
uint8_t tq_avg;
|
|
|
|
batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
|
|
"update_originator(): Searching and updating originator entry of received packet\n");
|
|
|
|
rcu_read_lock();
|
|
hlist_for_each_entry_rcu(tmp_neigh_node,
|
|
&orig_node->neigh_list, list) {
|
|
neigh_addr = tmp_neigh_node->addr;
|
|
if (batadv_compare_eth(neigh_addr, ethhdr->h_source) &&
|
|
tmp_neigh_node->if_incoming == if_incoming &&
|
|
atomic_inc_not_zero(&tmp_neigh_node->refcount)) {
|
|
if (WARN(neigh_node, "too many matching neigh_nodes"))
|
|
batadv_neigh_node_free_ref(neigh_node);
|
|
neigh_node = tmp_neigh_node;
|
|
continue;
|
|
}
|
|
|
|
if (dup_status != BATADV_NO_DUP)
|
|
continue;
|
|
|
|
/* only update the entry for this outgoing interface */
|
|
neigh_ifinfo = batadv_neigh_ifinfo_get(tmp_neigh_node,
|
|
if_outgoing);
|
|
if (!neigh_ifinfo)
|
|
continue;
|
|
|
|
spin_lock_bh(&tmp_neigh_node->ifinfo_lock);
|
|
batadv_ring_buffer_set(neigh_ifinfo->bat_iv.tq_recv,
|
|
&neigh_ifinfo->bat_iv.tq_index, 0);
|
|
tq_avg = batadv_ring_buffer_avg(neigh_ifinfo->bat_iv.tq_recv);
|
|
neigh_ifinfo->bat_iv.tq_avg = tq_avg;
|
|
spin_unlock_bh(&tmp_neigh_node->ifinfo_lock);
|
|
|
|
batadv_neigh_ifinfo_free_ref(neigh_ifinfo);
|
|
neigh_ifinfo = NULL;
|
|
}
|
|
|
|
if (!neigh_node) {
|
|
struct batadv_orig_node *orig_tmp;
|
|
|
|
orig_tmp = batadv_iv_ogm_orig_get(bat_priv, ethhdr->h_source);
|
|
if (!orig_tmp)
|
|
goto unlock;
|
|
|
|
neigh_node = batadv_iv_ogm_neigh_new(if_incoming,
|
|
ethhdr->h_source,
|
|
orig_node, orig_tmp);
|
|
|
|
batadv_orig_node_free_ref(orig_tmp);
|
|
if (!neigh_node)
|
|
goto unlock;
|
|
} else
|
|
batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
|
|
"Updating existing last-hop neighbor of originator\n");
|
|
|
|
rcu_read_unlock();
|
|
neigh_ifinfo = batadv_neigh_ifinfo_new(neigh_node, if_outgoing);
|
|
if (!neigh_ifinfo)
|
|
goto out;
|
|
|
|
neigh_node->last_seen = jiffies;
|
|
|
|
spin_lock_bh(&neigh_node->ifinfo_lock);
|
|
batadv_ring_buffer_set(neigh_ifinfo->bat_iv.tq_recv,
|
|
&neigh_ifinfo->bat_iv.tq_index,
|
|
batadv_ogm_packet->tq);
|
|
tq_avg = batadv_ring_buffer_avg(neigh_ifinfo->bat_iv.tq_recv);
|
|
neigh_ifinfo->bat_iv.tq_avg = tq_avg;
|
|
spin_unlock_bh(&neigh_node->ifinfo_lock);
|
|
|
|
if (dup_status == BATADV_NO_DUP) {
|
|
orig_ifinfo->last_ttl = batadv_ogm_packet->ttl;
|
|
neigh_ifinfo->last_ttl = batadv_ogm_packet->ttl;
|
|
}
|
|
|
|
/* if this neighbor already is our next hop there is nothing
|
|
* to change
|
|
*/
|
|
router = batadv_orig_router_get(orig_node, if_outgoing);
|
|
if (router == neigh_node)
|
|
goto out;
|
|
|
|
if (router) {
|
|
router_ifinfo = batadv_neigh_ifinfo_get(router, if_outgoing);
|
|
if (!router_ifinfo)
|
|
goto out;
|
|
|
|
/* if this neighbor does not offer a better TQ we won't
|
|
* consider it
|
|
*/
|
|
if (router_ifinfo->bat_iv.tq_avg > neigh_ifinfo->bat_iv.tq_avg)
|
|
goto out;
|
|
}
|
|
|
|
/* if the TQ is the same and the link not more symmetric we
|
|
* won't consider it either
|
|
*/
|
|
if (router_ifinfo &&
|
|
(neigh_ifinfo->bat_iv.tq_avg == router_ifinfo->bat_iv.tq_avg)) {
|
|
orig_node_tmp = router->orig_node;
|
|
spin_lock_bh(&orig_node_tmp->bat_iv.ogm_cnt_lock);
|
|
if_num = router->if_incoming->if_num;
|
|
sum_orig = orig_node_tmp->bat_iv.bcast_own_sum[if_num];
|
|
spin_unlock_bh(&orig_node_tmp->bat_iv.ogm_cnt_lock);
|
|
|
|
orig_node_tmp = neigh_node->orig_node;
|
|
spin_lock_bh(&orig_node_tmp->bat_iv.ogm_cnt_lock);
|
|
if_num = neigh_node->if_incoming->if_num;
|
|
sum_neigh = orig_node_tmp->bat_iv.bcast_own_sum[if_num];
|
|
spin_unlock_bh(&orig_node_tmp->bat_iv.ogm_cnt_lock);
|
|
|
|
if (sum_orig >= sum_neigh)
|
|
goto out;
|
|
}
|
|
|
|
batadv_update_route(bat_priv, orig_node, if_outgoing, neigh_node);
|
|
goto out;
|
|
|
|
unlock:
|
|
rcu_read_unlock();
|
|
out:
|
|
if (neigh_node)
|
|
batadv_neigh_node_free_ref(neigh_node);
|
|
if (router)
|
|
batadv_neigh_node_free_ref(router);
|
|
if (neigh_ifinfo)
|
|
batadv_neigh_ifinfo_free_ref(neigh_ifinfo);
|
|
if (router_ifinfo)
|
|
batadv_neigh_ifinfo_free_ref(router_ifinfo);
|
|
}
|
|
|
|
/**
|
|
* batadv_iv_ogm_calc_tq - calculate tq for current received ogm packet
|
|
* @orig_node: the orig node who originally emitted the ogm packet
|
|
* @orig_neigh_node: the orig node struct of the neighbor who sent the packet
|
|
* @batadv_ogm_packet: the ogm packet
|
|
* @if_incoming: interface where the packet was received
|
|
* @if_outgoing: interface for which the retransmission should be considered
|
|
*
|
|
* Returns 1 if the link can be considered bidirectional, 0 otherwise
|
|
*/
|
|
static int batadv_iv_ogm_calc_tq(struct batadv_orig_node *orig_node,
|
|
struct batadv_orig_node *orig_neigh_node,
|
|
struct batadv_ogm_packet *batadv_ogm_packet,
|
|
struct batadv_hard_iface *if_incoming,
|
|
struct batadv_hard_iface *if_outgoing)
|
|
{
|
|
struct batadv_priv *bat_priv = netdev_priv(if_incoming->soft_iface);
|
|
struct batadv_neigh_node *neigh_node = NULL, *tmp_neigh_node;
|
|
struct batadv_neigh_ifinfo *neigh_ifinfo;
|
|
uint8_t total_count;
|
|
uint8_t orig_eq_count, neigh_rq_count, neigh_rq_inv, tq_own;
|
|
unsigned int neigh_rq_inv_cube, neigh_rq_max_cube;
|
|
int tq_asym_penalty, inv_asym_penalty, if_num, ret = 0;
|
|
unsigned int combined_tq;
|
|
int tq_iface_penalty;
|
|
|
|
/* find corresponding one hop neighbor */
|
|
rcu_read_lock();
|
|
hlist_for_each_entry_rcu(tmp_neigh_node,
|
|
&orig_neigh_node->neigh_list, list) {
|
|
if (!batadv_compare_eth(tmp_neigh_node->addr,
|
|
orig_neigh_node->orig))
|
|
continue;
|
|
|
|
if (tmp_neigh_node->if_incoming != if_incoming)
|
|
continue;
|
|
|
|
if (!atomic_inc_not_zero(&tmp_neigh_node->refcount))
|
|
continue;
|
|
|
|
neigh_node = tmp_neigh_node;
|
|
break;
|
|
}
|
|
rcu_read_unlock();
|
|
|
|
if (!neigh_node)
|
|
neigh_node = batadv_iv_ogm_neigh_new(if_incoming,
|
|
orig_neigh_node->orig,
|
|
orig_neigh_node,
|
|
orig_neigh_node);
|
|
|
|
if (!neigh_node)
|
|
goto out;
|
|
|
|
/* if orig_node is direct neighbor update neigh_node last_seen */
|
|
if (orig_node == orig_neigh_node)
|
|
neigh_node->last_seen = jiffies;
|
|
|
|
orig_node->last_seen = jiffies;
|
|
|
|
/* find packet count of corresponding one hop neighbor */
|
|
spin_lock_bh(&orig_node->bat_iv.ogm_cnt_lock);
|
|
if_num = if_incoming->if_num;
|
|
orig_eq_count = orig_neigh_node->bat_iv.bcast_own_sum[if_num];
|
|
neigh_ifinfo = batadv_neigh_ifinfo_new(neigh_node, if_outgoing);
|
|
if (neigh_ifinfo) {
|
|
neigh_rq_count = neigh_ifinfo->bat_iv.real_packet_count;
|
|
batadv_neigh_ifinfo_free_ref(neigh_ifinfo);
|
|
} else {
|
|
neigh_rq_count = 0;
|
|
}
|
|
spin_unlock_bh(&orig_node->bat_iv.ogm_cnt_lock);
|
|
|
|
/* pay attention to not get a value bigger than 100 % */
|
|
if (orig_eq_count > neigh_rq_count)
|
|
total_count = neigh_rq_count;
|
|
else
|
|
total_count = orig_eq_count;
|
|
|
|
/* if we have too few packets (too less data) we set tq_own to zero
|
|
* if we receive too few packets it is not considered bidirectional
|
|
*/
|
|
if (total_count < BATADV_TQ_LOCAL_BIDRECT_SEND_MINIMUM ||
|
|
neigh_rq_count < BATADV_TQ_LOCAL_BIDRECT_RECV_MINIMUM)
|
|
tq_own = 0;
|
|
else
|
|
/* neigh_node->real_packet_count is never zero as we
|
|
* only purge old information when getting new
|
|
* information
|
|
*/
|
|
tq_own = (BATADV_TQ_MAX_VALUE * total_count) / neigh_rq_count;
|
|
|
|
/* 1 - ((1-x) ** 3), normalized to TQ_MAX_VALUE this does
|
|
* affect the nearly-symmetric links only a little, but
|
|
* punishes asymmetric links more. This will give a value
|
|
* between 0 and TQ_MAX_VALUE
|
|
*/
|
|
neigh_rq_inv = BATADV_TQ_LOCAL_WINDOW_SIZE - neigh_rq_count;
|
|
neigh_rq_inv_cube = neigh_rq_inv * neigh_rq_inv * neigh_rq_inv;
|
|
neigh_rq_max_cube = BATADV_TQ_LOCAL_WINDOW_SIZE *
|
|
BATADV_TQ_LOCAL_WINDOW_SIZE *
|
|
BATADV_TQ_LOCAL_WINDOW_SIZE;
|
|
inv_asym_penalty = BATADV_TQ_MAX_VALUE * neigh_rq_inv_cube;
|
|
inv_asym_penalty /= neigh_rq_max_cube;
|
|
tq_asym_penalty = BATADV_TQ_MAX_VALUE - inv_asym_penalty;
|
|
|
|
/* penalize if the OGM is forwarded on the same interface. WiFi
|
|
* interfaces and other half duplex devices suffer from throughput
|
|
* drops as they can't send and receive at the same time.
|
|
*/
|
|
tq_iface_penalty = BATADV_TQ_MAX_VALUE;
|
|
if (if_outgoing && (if_incoming == if_outgoing) &&
|
|
batadv_is_wifi_netdev(if_outgoing->net_dev))
|
|
tq_iface_penalty = batadv_hop_penalty(BATADV_TQ_MAX_VALUE,
|
|
bat_priv);
|
|
|
|
combined_tq = batadv_ogm_packet->tq *
|
|
tq_own *
|
|
tq_asym_penalty *
|
|
tq_iface_penalty;
|
|
combined_tq /= BATADV_TQ_MAX_VALUE *
|
|
BATADV_TQ_MAX_VALUE *
|
|
BATADV_TQ_MAX_VALUE;
|
|
batadv_ogm_packet->tq = combined_tq;
|
|
|
|
batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
|
|
"bidirectional: orig = %-15pM neigh = %-15pM => own_bcast = %2i, real recv = %2i, local tq: %3i, asym_penalty: %3i, iface_penalty: %3i, total tq: %3i, if_incoming = %s, if_outgoing = %s\n",
|
|
orig_node->orig, orig_neigh_node->orig, total_count,
|
|
neigh_rq_count, tq_own, tq_asym_penalty, tq_iface_penalty,
|
|
batadv_ogm_packet->tq, if_incoming->net_dev->name,
|
|
if_outgoing ? if_outgoing->net_dev->name : "DEFAULT");
|
|
|
|
/* if link has the minimum required transmission quality
|
|
* consider it bidirectional
|
|
*/
|
|
if (batadv_ogm_packet->tq >= BATADV_TQ_TOTAL_BIDRECT_LIMIT)
|
|
ret = 1;
|
|
|
|
out:
|
|
if (neigh_node)
|
|
batadv_neigh_node_free_ref(neigh_node);
|
|
return ret;
|
|
}
|
|
|
|
/**
|
|
* batadv_iv_ogm_update_seqnos - process a batman packet for all interfaces,
|
|
* adjust the sequence number and find out whether it is a duplicate
|
|
* @ethhdr: ethernet header of the packet
|
|
* @batadv_ogm_packet: OGM packet to be considered
|
|
* @if_incoming: interface on which the OGM packet was received
|
|
* @if_outgoing: interface for which the retransmission should be considered
|
|
*
|
|
* Returns duplicate status as enum batadv_dup_status
|
|
*/
|
|
static enum batadv_dup_status
|
|
batadv_iv_ogm_update_seqnos(const struct ethhdr *ethhdr,
|
|
const struct batadv_ogm_packet *batadv_ogm_packet,
|
|
const struct batadv_hard_iface *if_incoming,
|
|
struct batadv_hard_iface *if_outgoing)
|
|
{
|
|
struct batadv_priv *bat_priv = netdev_priv(if_incoming->soft_iface);
|
|
struct batadv_orig_node *orig_node;
|
|
struct batadv_orig_ifinfo *orig_ifinfo = NULL;
|
|
struct batadv_neigh_node *neigh_node;
|
|
struct batadv_neigh_ifinfo *neigh_ifinfo;
|
|
int is_dup;
|
|
int32_t seq_diff;
|
|
int need_update = 0;
|
|
int set_mark;
|
|
enum batadv_dup_status ret = BATADV_NO_DUP;
|
|
uint32_t seqno = ntohl(batadv_ogm_packet->seqno);
|
|
uint8_t *neigh_addr;
|
|
uint8_t packet_count;
|
|
unsigned long *bitmap;
|
|
|
|
orig_node = batadv_iv_ogm_orig_get(bat_priv, batadv_ogm_packet->orig);
|
|
if (!orig_node)
|
|
return BATADV_NO_DUP;
|
|
|
|
orig_ifinfo = batadv_orig_ifinfo_new(orig_node, if_outgoing);
|
|
if (WARN_ON(!orig_ifinfo)) {
|
|
batadv_orig_node_free_ref(orig_node);
|
|
return 0;
|
|
}
|
|
|
|
spin_lock_bh(&orig_node->bat_iv.ogm_cnt_lock);
|
|
seq_diff = seqno - orig_ifinfo->last_real_seqno;
|
|
|
|
/* signalize caller that the packet is to be dropped. */
|
|
if (!hlist_empty(&orig_node->neigh_list) &&
|
|
batadv_window_protected(bat_priv, seq_diff,
|
|
&orig_ifinfo->batman_seqno_reset)) {
|
|
ret = BATADV_PROTECTED;
|
|
goto out;
|
|
}
|
|
|
|
rcu_read_lock();
|
|
hlist_for_each_entry_rcu(neigh_node, &orig_node->neigh_list, list) {
|
|
neigh_ifinfo = batadv_neigh_ifinfo_new(neigh_node,
|
|
if_outgoing);
|
|
if (!neigh_ifinfo)
|
|
continue;
|
|
|
|
neigh_addr = neigh_node->addr;
|
|
is_dup = batadv_test_bit(neigh_ifinfo->bat_iv.real_bits,
|
|
orig_ifinfo->last_real_seqno,
|
|
seqno);
|
|
|
|
if (batadv_compare_eth(neigh_addr, ethhdr->h_source) &&
|
|
neigh_node->if_incoming == if_incoming) {
|
|
set_mark = 1;
|
|
if (is_dup)
|
|
ret = BATADV_NEIGH_DUP;
|
|
} else {
|
|
set_mark = 0;
|
|
if (is_dup && (ret != BATADV_NEIGH_DUP))
|
|
ret = BATADV_ORIG_DUP;
|
|
}
|
|
|
|
/* if the window moved, set the update flag. */
|
|
bitmap = neigh_ifinfo->bat_iv.real_bits;
|
|
need_update |= batadv_bit_get_packet(bat_priv, bitmap,
|
|
seq_diff, set_mark);
|
|
|
|
packet_count = bitmap_weight(bitmap,
|
|
BATADV_TQ_LOCAL_WINDOW_SIZE);
|
|
neigh_ifinfo->bat_iv.real_packet_count = packet_count;
|
|
batadv_neigh_ifinfo_free_ref(neigh_ifinfo);
|
|
}
|
|
rcu_read_unlock();
|
|
|
|
if (need_update) {
|
|
batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
|
|
"%s updating last_seqno: old %u, new %u\n",
|
|
if_outgoing ? if_outgoing->net_dev->name : "DEFAULT",
|
|
orig_ifinfo->last_real_seqno, seqno);
|
|
orig_ifinfo->last_real_seqno = seqno;
|
|
}
|
|
|
|
out:
|
|
spin_unlock_bh(&orig_node->bat_iv.ogm_cnt_lock);
|
|
batadv_orig_node_free_ref(orig_node);
|
|
if (orig_ifinfo)
|
|
batadv_orig_ifinfo_free_ref(orig_ifinfo);
|
|
return ret;
|
|
}
|
|
|
|
/**
|
|
* batadv_iv_ogm_process_per_outif - process a batman iv OGM for an outgoing if
|
|
* @skb: the skb containing the OGM
|
|
* @ogm_offset: offset from skb->data to start of ogm header
|
|
* @orig_node: the (cached) orig node for the originator of this OGM
|
|
* @if_incoming: the interface where this packet was received
|
|
* @if_outgoing: the interface for which the packet should be considered
|
|
*/
|
|
static void
|
|
batadv_iv_ogm_process_per_outif(const struct sk_buff *skb, int ogm_offset,
|
|
struct batadv_orig_node *orig_node,
|
|
struct batadv_hard_iface *if_incoming,
|
|
struct batadv_hard_iface *if_outgoing)
|
|
{
|
|
struct batadv_priv *bat_priv = netdev_priv(if_incoming->soft_iface);
|
|
struct batadv_neigh_node *router = NULL, *router_router = NULL;
|
|
struct batadv_orig_node *orig_neigh_node;
|
|
struct batadv_orig_ifinfo *orig_ifinfo;
|
|
struct batadv_neigh_node *orig_neigh_router = NULL;
|
|
struct batadv_neigh_ifinfo *router_ifinfo = NULL;
|
|
struct batadv_ogm_packet *ogm_packet;
|
|
enum batadv_dup_status dup_status;
|
|
bool is_from_best_next_hop = false;
|
|
bool is_single_hop_neigh = false;
|
|
bool sameseq, similar_ttl;
|
|
struct sk_buff *skb_priv;
|
|
struct ethhdr *ethhdr;
|
|
uint8_t *prev_sender;
|
|
int is_bidirect;
|
|
|
|
/* create a private copy of the skb, as some functions change tq value
|
|
* and/or flags.
|
|
*/
|
|
skb_priv = skb_copy(skb, GFP_ATOMIC);
|
|
if (!skb_priv)
|
|
return;
|
|
|
|
ethhdr = eth_hdr(skb_priv);
|
|
ogm_packet = (struct batadv_ogm_packet *)(skb_priv->data + ogm_offset);
|
|
|
|
dup_status = batadv_iv_ogm_update_seqnos(ethhdr, ogm_packet,
|
|
if_incoming, if_outgoing);
|
|
if (batadv_compare_eth(ethhdr->h_source, ogm_packet->orig))
|
|
is_single_hop_neigh = true;
|
|
|
|
if (dup_status == BATADV_PROTECTED) {
|
|
batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
|
|
"Drop packet: packet within seqno protection time (sender: %pM)\n",
|
|
ethhdr->h_source);
|
|
goto out;
|
|
}
|
|
|
|
if (ogm_packet->tq == 0) {
|
|
batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
|
|
"Drop packet: originator packet with tq equal 0\n");
|
|
goto out;
|
|
}
|
|
|
|
router = batadv_orig_router_get(orig_node, if_outgoing);
|
|
if (router) {
|
|
router_router = batadv_orig_router_get(router->orig_node,
|
|
if_outgoing);
|
|
router_ifinfo = batadv_neigh_ifinfo_get(router, if_outgoing);
|
|
}
|
|
|
|
if ((router_ifinfo && router_ifinfo->bat_iv.tq_avg != 0) &&
|
|
(batadv_compare_eth(router->addr, ethhdr->h_source)))
|
|
is_from_best_next_hop = true;
|
|
|
|
prev_sender = ogm_packet->prev_sender;
|
|
/* avoid temporary routing loops */
|
|
if (router && router_router &&
|
|
(batadv_compare_eth(router->addr, prev_sender)) &&
|
|
!(batadv_compare_eth(ogm_packet->orig, prev_sender)) &&
|
|
(batadv_compare_eth(router->addr, router_router->addr))) {
|
|
batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
|
|
"Drop packet: ignoring all rebroadcast packets that may make me loop (sender: %pM)\n",
|
|
ethhdr->h_source);
|
|
goto out;
|
|
}
|
|
|
|
if (if_outgoing == BATADV_IF_DEFAULT)
|
|
batadv_tvlv_ogm_receive(bat_priv, ogm_packet, orig_node);
|
|
|
|
/* if sender is a direct neighbor the sender mac equals
|
|
* originator mac
|
|
*/
|
|
if (is_single_hop_neigh)
|
|
orig_neigh_node = orig_node;
|
|
else
|
|
orig_neigh_node = batadv_iv_ogm_orig_get(bat_priv,
|
|
ethhdr->h_source);
|
|
|
|
if (!orig_neigh_node)
|
|
goto out;
|
|
|
|
/* Update nc_nodes of the originator */
|
|
batadv_nc_update_nc_node(bat_priv, orig_node, orig_neigh_node,
|
|
ogm_packet, is_single_hop_neigh);
|
|
|
|
orig_neigh_router = batadv_orig_router_get(orig_neigh_node,
|
|
if_outgoing);
|
|
|
|
/* drop packet if sender is not a direct neighbor and if we
|
|
* don't route towards it
|
|
*/
|
|
if (!is_single_hop_neigh && (!orig_neigh_router)) {
|
|
batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
|
|
"Drop packet: OGM via unknown neighbor!\n");
|
|
goto out_neigh;
|
|
}
|
|
|
|
is_bidirect = batadv_iv_ogm_calc_tq(orig_node, orig_neigh_node,
|
|
ogm_packet, if_incoming,
|
|
if_outgoing);
|
|
|
|
/* update ranking if it is not a duplicate or has the same
|
|
* seqno and similar ttl as the non-duplicate
|
|
*/
|
|
orig_ifinfo = batadv_orig_ifinfo_new(orig_node, if_outgoing);
|
|
if (!orig_ifinfo)
|
|
goto out_neigh;
|
|
|
|
sameseq = orig_ifinfo->last_real_seqno == ntohl(ogm_packet->seqno);
|
|
similar_ttl = (orig_ifinfo->last_ttl - 3) <= ogm_packet->ttl;
|
|
|
|
if (is_bidirect && ((dup_status == BATADV_NO_DUP) ||
|
|
(sameseq && similar_ttl))) {
|
|
batadv_iv_ogm_orig_update(bat_priv, orig_node,
|
|
orig_ifinfo, ethhdr,
|
|
ogm_packet, if_incoming,
|
|
if_outgoing, dup_status);
|
|
}
|
|
batadv_orig_ifinfo_free_ref(orig_ifinfo);
|
|
|
|
/* only forward for specific interface, not for the default one. */
|
|
if (if_outgoing == BATADV_IF_DEFAULT)
|
|
goto out_neigh;
|
|
|
|
/* is single hop (direct) neighbor */
|
|
if (is_single_hop_neigh) {
|
|
/* OGMs from secondary interfaces should only scheduled once
|
|
* per interface where it has been received, not multiple times
|
|
*/
|
|
if ((ogm_packet->ttl <= 2) &&
|
|
(if_incoming != if_outgoing)) {
|
|
batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
|
|
"Drop packet: OGM from secondary interface and wrong outgoing interface\n");
|
|
goto out_neigh;
|
|
}
|
|
/* mark direct link on incoming interface */
|
|
batadv_iv_ogm_forward(orig_node, ethhdr, ogm_packet,
|
|
is_single_hop_neigh,
|
|
is_from_best_next_hop, if_incoming,
|
|
if_outgoing);
|
|
|
|
batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
|
|
"Forwarding packet: rebroadcast neighbor packet with direct link flag\n");
|
|
goto out_neigh;
|
|
}
|
|
|
|
/* multihop originator */
|
|
if (!is_bidirect) {
|
|
batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
|
|
"Drop packet: not received via bidirectional link\n");
|
|
goto out_neigh;
|
|
}
|
|
|
|
if (dup_status == BATADV_NEIGH_DUP) {
|
|
batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
|
|
"Drop packet: duplicate packet received\n");
|
|
goto out_neigh;
|
|
}
|
|
|
|
batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
|
|
"Forwarding packet: rebroadcast originator packet\n");
|
|
batadv_iv_ogm_forward(orig_node, ethhdr, ogm_packet,
|
|
is_single_hop_neigh, is_from_best_next_hop,
|
|
if_incoming, if_outgoing);
|
|
|
|
out_neigh:
|
|
if ((orig_neigh_node) && (!is_single_hop_neigh))
|
|
batadv_orig_node_free_ref(orig_neigh_node);
|
|
out:
|
|
if (router_ifinfo)
|
|
batadv_neigh_ifinfo_free_ref(router_ifinfo);
|
|
if (router)
|
|
batadv_neigh_node_free_ref(router);
|
|
if (router_router)
|
|
batadv_neigh_node_free_ref(router_router);
|
|
if (orig_neigh_router)
|
|
batadv_neigh_node_free_ref(orig_neigh_router);
|
|
|
|
kfree_skb(skb_priv);
|
|
}
|
|
|
|
/**
|
|
* batadv_iv_ogm_process - process an incoming batman iv OGM
|
|
* @skb: the skb containing the OGM
|
|
* @ogm_offset: offset to the OGM which should be processed (for aggregates)
|
|
* @if_incoming: the interface where this packet was receved
|
|
*/
|
|
static void batadv_iv_ogm_process(const struct sk_buff *skb, int ogm_offset,
|
|
struct batadv_hard_iface *if_incoming)
|
|
{
|
|
struct batadv_priv *bat_priv = netdev_priv(if_incoming->soft_iface);
|
|
struct batadv_orig_node *orig_neigh_node, *orig_node;
|
|
struct batadv_hard_iface *hard_iface;
|
|
struct batadv_ogm_packet *ogm_packet;
|
|
uint32_t if_incoming_seqno;
|
|
bool has_directlink_flag;
|
|
struct ethhdr *ethhdr;
|
|
bool is_my_oldorig = false;
|
|
bool is_my_addr = false;
|
|
bool is_my_orig = false;
|
|
|
|
ogm_packet = (struct batadv_ogm_packet *)(skb->data + ogm_offset);
|
|
ethhdr = eth_hdr(skb);
|
|
|
|
/* Silently drop when the batman packet is actually not a
|
|
* correct packet.
|
|
*
|
|
* This might happen if a packet is padded (e.g. Ethernet has a
|
|
* minimum frame length of 64 byte) and the aggregation interprets
|
|
* it as an additional length.
|
|
*
|
|
* TODO: A more sane solution would be to have a bit in the
|
|
* batadv_ogm_packet to detect whether the packet is the last
|
|
* packet in an aggregation. Here we expect that the padding
|
|
* is always zero (or not 0x01)
|
|
*/
|
|
if (ogm_packet->packet_type != BATADV_IV_OGM)
|
|
return;
|
|
|
|
/* could be changed by schedule_own_packet() */
|
|
if_incoming_seqno = atomic_read(&if_incoming->bat_iv.ogm_seqno);
|
|
|
|
if (ogm_packet->flags & BATADV_DIRECTLINK)
|
|
has_directlink_flag = true;
|
|
else
|
|
has_directlink_flag = false;
|
|
|
|
batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
|
|
"Received BATMAN packet via NB: %pM, IF: %s [%pM] (from OG: %pM, via prev OG: %pM, seqno %u, tq %d, TTL %d, V %d, IDF %d)\n",
|
|
ethhdr->h_source, if_incoming->net_dev->name,
|
|
if_incoming->net_dev->dev_addr, ogm_packet->orig,
|
|
ogm_packet->prev_sender, ntohl(ogm_packet->seqno),
|
|
ogm_packet->tq, ogm_packet->ttl,
|
|
ogm_packet->version, has_directlink_flag);
|
|
|
|
rcu_read_lock();
|
|
list_for_each_entry_rcu(hard_iface, &batadv_hardif_list, list) {
|
|
if (hard_iface->if_status != BATADV_IF_ACTIVE)
|
|
continue;
|
|
|
|
if (hard_iface->soft_iface != if_incoming->soft_iface)
|
|
continue;
|
|
|
|
if (batadv_compare_eth(ethhdr->h_source,
|
|
hard_iface->net_dev->dev_addr))
|
|
is_my_addr = true;
|
|
|
|
if (batadv_compare_eth(ogm_packet->orig,
|
|
hard_iface->net_dev->dev_addr))
|
|
is_my_orig = true;
|
|
|
|
if (batadv_compare_eth(ogm_packet->prev_sender,
|
|
hard_iface->net_dev->dev_addr))
|
|
is_my_oldorig = true;
|
|
}
|
|
rcu_read_unlock();
|
|
|
|
if (is_my_addr) {
|
|
batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
|
|
"Drop packet: received my own broadcast (sender: %pM)\n",
|
|
ethhdr->h_source);
|
|
return;
|
|
}
|
|
|
|
if (is_my_orig) {
|
|
unsigned long *word;
|
|
int offset;
|
|
int32_t bit_pos;
|
|
int16_t if_num;
|
|
uint8_t *weight;
|
|
|
|
orig_neigh_node = batadv_iv_ogm_orig_get(bat_priv,
|
|
ethhdr->h_source);
|
|
if (!orig_neigh_node)
|
|
return;
|
|
|
|
/* neighbor has to indicate direct link and it has to
|
|
* come via the corresponding interface
|
|
* save packet seqno for bidirectional check
|
|
*/
|
|
if (has_directlink_flag &&
|
|
batadv_compare_eth(if_incoming->net_dev->dev_addr,
|
|
ogm_packet->orig)) {
|
|
if_num = if_incoming->if_num;
|
|
offset = if_num * BATADV_NUM_WORDS;
|
|
|
|
spin_lock_bh(&orig_neigh_node->bat_iv.ogm_cnt_lock);
|
|
word = &orig_neigh_node->bat_iv.bcast_own[offset];
|
|
bit_pos = if_incoming_seqno - 2;
|
|
bit_pos -= ntohl(ogm_packet->seqno);
|
|
batadv_set_bit(word, bit_pos);
|
|
weight = &orig_neigh_node->bat_iv.bcast_own_sum[if_num];
|
|
*weight = bitmap_weight(word,
|
|
BATADV_TQ_LOCAL_WINDOW_SIZE);
|
|
spin_unlock_bh(&orig_neigh_node->bat_iv.ogm_cnt_lock);
|
|
}
|
|
|
|
batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
|
|
"Drop packet: originator packet from myself (via neighbor)\n");
|
|
batadv_orig_node_free_ref(orig_neigh_node);
|
|
return;
|
|
}
|
|
|
|
if (is_my_oldorig) {
|
|
batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
|
|
"Drop packet: ignoring all rebroadcast echos (sender: %pM)\n",
|
|
ethhdr->h_source);
|
|
return;
|
|
}
|
|
|
|
if (ogm_packet->flags & BATADV_NOT_BEST_NEXT_HOP) {
|
|
batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
|
|
"Drop packet: ignoring all packets not forwarded from the best next hop (sender: %pM)\n",
|
|
ethhdr->h_source);
|
|
return;
|
|
}
|
|
|
|
orig_node = batadv_iv_ogm_orig_get(bat_priv, ogm_packet->orig);
|
|
if (!orig_node)
|
|
return;
|
|
|
|
batadv_iv_ogm_process_per_outif(skb, ogm_offset, orig_node,
|
|
if_incoming, BATADV_IF_DEFAULT);
|
|
|
|
rcu_read_lock();
|
|
list_for_each_entry_rcu(hard_iface, &batadv_hardif_list, list) {
|
|
if (hard_iface->if_status != BATADV_IF_ACTIVE)
|
|
continue;
|
|
|
|
if (hard_iface->soft_iface != bat_priv->soft_iface)
|
|
continue;
|
|
|
|
batadv_iv_ogm_process_per_outif(skb, ogm_offset, orig_node,
|
|
if_incoming, hard_iface);
|
|
}
|
|
rcu_read_unlock();
|
|
|
|
batadv_orig_node_free_ref(orig_node);
|
|
}
|
|
|
|
static int batadv_iv_ogm_receive(struct sk_buff *skb,
|
|
struct batadv_hard_iface *if_incoming)
|
|
{
|
|
struct batadv_priv *bat_priv = netdev_priv(if_incoming->soft_iface);
|
|
struct batadv_ogm_packet *ogm_packet;
|
|
uint8_t *packet_pos;
|
|
int ogm_offset;
|
|
bool ret;
|
|
|
|
ret = batadv_check_management_packet(skb, if_incoming, BATADV_OGM_HLEN);
|
|
if (!ret)
|
|
return NET_RX_DROP;
|
|
|
|
/* did we receive a B.A.T.M.A.N. IV OGM packet on an interface
|
|
* that does not have B.A.T.M.A.N. IV enabled ?
|
|
*/
|
|
if (bat_priv->bat_algo_ops->bat_ogm_emit != batadv_iv_ogm_emit)
|
|
return NET_RX_DROP;
|
|
|
|
batadv_inc_counter(bat_priv, BATADV_CNT_MGMT_RX);
|
|
batadv_add_counter(bat_priv, BATADV_CNT_MGMT_RX_BYTES,
|
|
skb->len + ETH_HLEN);
|
|
|
|
ogm_offset = 0;
|
|
ogm_packet = (struct batadv_ogm_packet *)skb->data;
|
|
|
|
/* unpack the aggregated packets and process them one by one */
|
|
while (batadv_iv_ogm_aggr_packet(ogm_offset, skb_headlen(skb),
|
|
ogm_packet->tvlv_len)) {
|
|
batadv_iv_ogm_process(skb, ogm_offset, if_incoming);
|
|
|
|
ogm_offset += BATADV_OGM_HLEN;
|
|
ogm_offset += ntohs(ogm_packet->tvlv_len);
|
|
|
|
packet_pos = skb->data + ogm_offset;
|
|
ogm_packet = (struct batadv_ogm_packet *)packet_pos;
|
|
}
|
|
|
|
kfree_skb(skb);
|
|
return NET_RX_SUCCESS;
|
|
}
|
|
|
|
/**
|
|
* batadv_iv_ogm_orig_print_neigh - print neighbors for the originator table
|
|
* @orig_node: the orig_node for which the neighbors are printed
|
|
* @if_outgoing: outgoing interface for these entries
|
|
* @seq: debugfs table seq_file struct
|
|
*
|
|
* Must be called while holding an rcu lock.
|
|
*/
|
|
static void
|
|
batadv_iv_ogm_orig_print_neigh(struct batadv_orig_node *orig_node,
|
|
struct batadv_hard_iface *if_outgoing,
|
|
struct seq_file *seq)
|
|
{
|
|
struct batadv_neigh_node *neigh_node;
|
|
struct batadv_neigh_ifinfo *n_ifinfo;
|
|
|
|
hlist_for_each_entry_rcu(neigh_node, &orig_node->neigh_list, list) {
|
|
n_ifinfo = batadv_neigh_ifinfo_get(neigh_node, if_outgoing);
|
|
if (!n_ifinfo)
|
|
continue;
|
|
|
|
seq_printf(seq, " %pM (%3i)",
|
|
neigh_node->addr,
|
|
n_ifinfo->bat_iv.tq_avg);
|
|
|
|
batadv_neigh_ifinfo_free_ref(n_ifinfo);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* batadv_iv_ogm_orig_print - print the originator table
|
|
* @bat_priv: the bat priv with all the soft interface information
|
|
* @seq: debugfs table seq_file struct
|
|
* @if_outgoing: the outgoing interface for which this should be printed
|
|
*/
|
|
static void batadv_iv_ogm_orig_print(struct batadv_priv *bat_priv,
|
|
struct seq_file *seq,
|
|
struct batadv_hard_iface *if_outgoing)
|
|
{
|
|
struct batadv_neigh_node *neigh_node;
|
|
struct batadv_hashtable *hash = bat_priv->orig_hash;
|
|
int last_seen_msecs, last_seen_secs;
|
|
struct batadv_orig_node *orig_node;
|
|
struct batadv_neigh_ifinfo *n_ifinfo;
|
|
unsigned long last_seen_jiffies;
|
|
struct hlist_head *head;
|
|
int batman_count = 0;
|
|
uint32_t i;
|
|
|
|
seq_printf(seq, " %-15s %s (%s/%i) %17s [%10s]: %20s ...\n",
|
|
"Originator", "last-seen", "#", BATADV_TQ_MAX_VALUE,
|
|
"Nexthop", "outgoingIF", "Potential nexthops");
|
|
|
|
for (i = 0; i < hash->size; i++) {
|
|
head = &hash->table[i];
|
|
|
|
rcu_read_lock();
|
|
hlist_for_each_entry_rcu(orig_node, head, hash_entry) {
|
|
neigh_node = batadv_orig_router_get(orig_node,
|
|
if_outgoing);
|
|
if (!neigh_node)
|
|
continue;
|
|
|
|
n_ifinfo = batadv_neigh_ifinfo_get(neigh_node,
|
|
if_outgoing);
|
|
if (!n_ifinfo)
|
|
goto next;
|
|
|
|
if (n_ifinfo->bat_iv.tq_avg == 0)
|
|
goto next;
|
|
|
|
last_seen_jiffies = jiffies - orig_node->last_seen;
|
|
last_seen_msecs = jiffies_to_msecs(last_seen_jiffies);
|
|
last_seen_secs = last_seen_msecs / 1000;
|
|
last_seen_msecs = last_seen_msecs % 1000;
|
|
|
|
seq_printf(seq, "%pM %4i.%03is (%3i) %pM [%10s]:",
|
|
orig_node->orig, last_seen_secs,
|
|
last_seen_msecs, n_ifinfo->bat_iv.tq_avg,
|
|
neigh_node->addr,
|
|
neigh_node->if_incoming->net_dev->name);
|
|
|
|
batadv_iv_ogm_orig_print_neigh(orig_node, if_outgoing,
|
|
seq);
|
|
seq_puts(seq, "\n");
|
|
batman_count++;
|
|
|
|
next:
|
|
batadv_neigh_node_free_ref(neigh_node);
|
|
if (n_ifinfo)
|
|
batadv_neigh_ifinfo_free_ref(n_ifinfo);
|
|
}
|
|
rcu_read_unlock();
|
|
}
|
|
|
|
if (batman_count == 0)
|
|
seq_puts(seq, "No batman nodes in range ...\n");
|
|
}
|
|
|
|
/**
|
|
* batadv_iv_ogm_neigh_cmp - compare the metrics of two neighbors
|
|
* @neigh1: the first neighbor object of the comparison
|
|
* @if_outgoing1: outgoing interface for the first neighbor
|
|
* @neigh2: the second neighbor object of the comparison
|
|
* @if_outgoing2: outgoing interface for the second neighbor
|
|
*
|
|
* Returns a value less, equal to or greater than 0 if the metric via neigh1 is
|
|
* lower, the same as or higher than the metric via neigh2
|
|
*/
|
|
static int batadv_iv_ogm_neigh_cmp(struct batadv_neigh_node *neigh1,
|
|
struct batadv_hard_iface *if_outgoing1,
|
|
struct batadv_neigh_node *neigh2,
|
|
struct batadv_hard_iface *if_outgoing2)
|
|
{
|
|
struct batadv_neigh_ifinfo *neigh1_ifinfo, *neigh2_ifinfo;
|
|
uint8_t tq1, tq2;
|
|
int diff;
|
|
|
|
neigh1_ifinfo = batadv_neigh_ifinfo_get(neigh1, if_outgoing1);
|
|
neigh2_ifinfo = batadv_neigh_ifinfo_get(neigh2, if_outgoing2);
|
|
|
|
if (!neigh1_ifinfo || !neigh2_ifinfo) {
|
|
diff = 0;
|
|
goto out;
|
|
}
|
|
|
|
tq1 = neigh1_ifinfo->bat_iv.tq_avg;
|
|
tq2 = neigh2_ifinfo->bat_iv.tq_avg;
|
|
diff = tq1 - tq2;
|
|
|
|
out:
|
|
if (neigh1_ifinfo)
|
|
batadv_neigh_ifinfo_free_ref(neigh1_ifinfo);
|
|
if (neigh2_ifinfo)
|
|
batadv_neigh_ifinfo_free_ref(neigh2_ifinfo);
|
|
|
|
return diff;
|
|
}
|
|
|
|
/**
|
|
* batadv_iv_ogm_neigh_is_eob - check if neigh1 is equally good or better than
|
|
* neigh2 from the metric prospective
|
|
* @neigh1: the first neighbor object of the comparison
|
|
* @if_outgoing1: outgoing interface for the first neighbor
|
|
* @neigh2: the second neighbor object of the comparison
|
|
* @if_outgoing2: outgoing interface for the second neighbor
|
|
*
|
|
* Returns true if the metric via neigh1 is equally good or better than
|
|
* the metric via neigh2, false otherwise.
|
|
*/
|
|
static bool
|
|
batadv_iv_ogm_neigh_is_eob(struct batadv_neigh_node *neigh1,
|
|
struct batadv_hard_iface *if_outgoing1,
|
|
struct batadv_neigh_node *neigh2,
|
|
struct batadv_hard_iface *if_outgoing2)
|
|
{
|
|
struct batadv_neigh_ifinfo *neigh1_ifinfo, *neigh2_ifinfo;
|
|
uint8_t tq1, tq2;
|
|
bool ret;
|
|
|
|
neigh1_ifinfo = batadv_neigh_ifinfo_get(neigh1, if_outgoing1);
|
|
neigh2_ifinfo = batadv_neigh_ifinfo_get(neigh2, if_outgoing2);
|
|
|
|
/* we can't say that the metric is better */
|
|
if (!neigh1_ifinfo || !neigh2_ifinfo) {
|
|
ret = false;
|
|
goto out;
|
|
}
|
|
|
|
tq1 = neigh1_ifinfo->bat_iv.tq_avg;
|
|
tq2 = neigh2_ifinfo->bat_iv.tq_avg;
|
|
ret = (tq1 - tq2) > -BATADV_TQ_SIMILARITY_THRESHOLD;
|
|
|
|
out:
|
|
if (neigh1_ifinfo)
|
|
batadv_neigh_ifinfo_free_ref(neigh1_ifinfo);
|
|
if (neigh2_ifinfo)
|
|
batadv_neigh_ifinfo_free_ref(neigh2_ifinfo);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static struct batadv_algo_ops batadv_batman_iv __read_mostly = {
|
|
.name = "BATMAN_IV",
|
|
.bat_iface_enable = batadv_iv_ogm_iface_enable,
|
|
.bat_iface_disable = batadv_iv_ogm_iface_disable,
|
|
.bat_iface_update_mac = batadv_iv_ogm_iface_update_mac,
|
|
.bat_primary_iface_set = batadv_iv_ogm_primary_iface_set,
|
|
.bat_ogm_schedule = batadv_iv_ogm_schedule,
|
|
.bat_ogm_emit = batadv_iv_ogm_emit,
|
|
.bat_neigh_cmp = batadv_iv_ogm_neigh_cmp,
|
|
.bat_neigh_is_equiv_or_better = batadv_iv_ogm_neigh_is_eob,
|
|
.bat_orig_print = batadv_iv_ogm_orig_print,
|
|
.bat_orig_free = batadv_iv_ogm_orig_free,
|
|
.bat_orig_add_if = batadv_iv_ogm_orig_add_if,
|
|
.bat_orig_del_if = batadv_iv_ogm_orig_del_if,
|
|
};
|
|
|
|
int __init batadv_iv_init(void)
|
|
{
|
|
int ret;
|
|
|
|
/* batman originator packet */
|
|
ret = batadv_recv_handler_register(BATADV_IV_OGM,
|
|
batadv_iv_ogm_receive);
|
|
if (ret < 0)
|
|
goto out;
|
|
|
|
ret = batadv_algo_register(&batadv_batman_iv);
|
|
if (ret < 0)
|
|
goto handler_unregister;
|
|
|
|
goto out;
|
|
|
|
handler_unregister:
|
|
batadv_recv_handler_unregister(BATADV_IV_OGM);
|
|
out:
|
|
return ret;
|
|
}
|