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8f34b38878
linux/net/batman-adv/bat_iv_ogm.c
Markus Pargmann 8f34b38878 batman-adv: iv_ogm_can_aggregate, code readability 
This patch tries to increase code readability by negating the first if
block and rearranging some of the other conditional blocks. This way we
save an indentation level, we also save some allocation that is not
necessary for one of the conditions.

Signed-off-by: Markus Pargmann <mpa@pengutronix.de>
Signed-off-by: Marek Lindner <mareklindner@neomailbox.ch>
2015-05-29 10:13:37 +02:00

1980 lines
60 KiB
C
Raw Blame History

/* Copyright (C) 2007-2015 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;
/* 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)
return -ENOMEM;
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;
return 0;
}
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 bool 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);
const 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
* otherwise aggregation is not possible
*/
if (!time_before(send_time, forw_packet->send_time) ||
!time_after_eq(aggregation_end_time, forw_packet->send_time))
return false;
if (aggregated_bytes > BATADV_MAX_AGGREGATION_BYTES)
return false;
/* packet is not leaving on the same interface. */
if (forw_packet->if_outgoing != if_outgoing)
return false;
/* 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)
return false;
/* 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;
}
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