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linux-zen-desktop/net/batman-adv/bat_iv_ogm.c

2551 lines
73 KiB
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Initial commit
2023-08-30 17:31:07 +02:00
// SPDX-License-Identifier: GPL-2.0
/* Copyright (C) B.A.T.M.A.N. contributors:
*
* Marek Lindner, Simon Wunderlich
*/
#include "bat_iv_ogm.h"
#include "main.h"
#include <linux/atomic.h>
#include <linux/bitmap.h>
#include <linux/bitops.h>
#include <linux/bug.h>
#include <linux/byteorder/generic.h>
#include <linux/cache.h>
#include <linux/container_of.h>
#include <linux/errno.h>
#include <linux/etherdevice.h>
#include <linux/gfp.h>
#include <linux/if_ether.h>
#include <linux/init.h>
#include <linux/jiffies.h>
#include <linux/kref.h>
#include <linux/list.h>
#include <linux/lockdep.h>
#include <linux/mutex.h>
#include <linux/netdevice.h>
#include <linux/netlink.h>
#include <linux/pkt_sched.h>
#include <linux/printk.h>
#include <linux/random.h>
#include <linux/rculist.h>
#include <linux/rcupdate.h>
#include <linux/skbuff.h>
#include <linux/slab.h>
#include <linux/spinlock.h>
#include <linux/stddef.h>
#include <linux/string.h>
#include <linux/types.h>
#include <linux/workqueue.h>
#include <net/genetlink.h>
#include <net/netlink.h>
#include <uapi/linux/batadv_packet.h>
#include <uapi/linux/batman_adv.h>
#include "bat_algo.h"
#include "bitarray.h"
#include "gateway_client.h"
#include "hard-interface.h"
#include "hash.h"
#include "log.h"
#include "netlink.h"
#include "network-coding.h"
#include "originator.h"
#include "routing.h"
#include "send.h"
#include "translation-table.h"
#include "tvlv.h"
static void batadv_iv_send_outstanding_bat_ogm_packet(struct work_struct *work);
/**
* enum batadv_dup_status - duplicate status
*/
enum batadv_dup_status {
/** @BATADV_NO_DUP: the packet is no duplicate */
BATADV_NO_DUP = 0,
/**
* @BATADV_ORIG_DUP: OGM is a duplicate in the originator (but not for
* the neighbor)
*/
BATADV_ORIG_DUP,
/** @BATADV_NEIGH_DUP: OGM is a duplicate for the neighbor */
BATADV_NEIGH_DUP,
/**
* @BATADV_PROTECTED: originator is currently protected (after reboot)
*/
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(u8 lq_recv[], u8 *lq_index, u8 value)
{
lq_recv[*lq_index] = value;
*lq_index = (*lq_index + 1) % BATADV_TQ_GLOBAL_WINDOW_SIZE;
}
/**
* batadv_ring_buffer_avg() - compute the average of all non-zero values stored
* in the given ring buffer
* @lq_recv: pointer to the ring buffer
*
* Return: computed average value.
*/
static u8 batadv_ring_buffer_avg(const u8 lq_recv[])
{
const u8 *ptr;
u16 count = 0;
u16 i = 0;
u16 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 (u8)(sum / count);
}
/**
* 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
*
* Return: the originator object corresponding to the passed mac address or NULL
* on failure.
* If the object does not exist, it is created and initialised.
*/
static struct batadv_orig_node *
batadv_iv_ogm_orig_get(struct batadv_priv *bat_priv, const u8 *addr)
{
struct batadv_orig_node *orig_node;
int 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);
kref_get(&orig_node->refcount);
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_hash;
return orig_node;
free_orig_node_hash:
/* reference for batadv_hash_add */
batadv_orig_node_put(orig_node);
/* reference from batadv_orig_node_new */
batadv_orig_node_put(orig_node);
return NULL;
}
static struct batadv_neigh_node *
batadv_iv_ogm_neigh_new(struct batadv_hard_iface *hard_iface,
const u8 *neigh_addr,
struct batadv_orig_node *orig_node,
struct batadv_orig_node *orig_neigh)
{
struct batadv_neigh_node *neigh_node;
neigh_node = batadv_neigh_node_get_or_create(orig_node,
hard_iface, neigh_addr);
if (!neigh_node)
goto out;
neigh_node->orig_node = orig_neigh;
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;
u32 random_seqno;
mutex_lock(&hard_iface->bat_iv.ogm_buff_mutex);
/* 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) {
mutex_unlock(&hard_iface->bat_iv.ogm_buff_mutex);
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;
mutex_unlock(&hard_iface->bat_iv.ogm_buff_mutex);
return 0;
}
static void batadv_iv_ogm_iface_disable(struct batadv_hard_iface *hard_iface)
{
mutex_lock(&hard_iface->bat_iv.ogm_buff_mutex);
kfree(hard_iface->bat_iv.ogm_buff);
hard_iface->bat_iv.ogm_buff = NULL;
mutex_unlock(&hard_iface->bat_iv.ogm_buff_mutex);
}
static void batadv_iv_ogm_iface_update_mac(struct batadv_hard_iface *hard_iface)
{
struct batadv_ogm_packet *batadv_ogm_packet;
void *ogm_buff;
mutex_lock(&hard_iface->bat_iv.ogm_buff_mutex);
ogm_buff = hard_iface->bat_iv.ogm_buff;
if (!ogm_buff)
goto unlock;
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);
unlock:
mutex_unlock(&hard_iface->bat_iv.ogm_buff_mutex);
}
static void
batadv_iv_ogm_primary_iface_set(struct batadv_hard_iface *hard_iface)
{
struct batadv_ogm_packet *batadv_ogm_packet;
void *ogm_buff;
mutex_lock(&hard_iface->bat_iv.ogm_buff_mutex);
ogm_buff = hard_iface->bat_iv.ogm_buff;
if (!ogm_buff)
goto unlock;
batadv_ogm_packet = ogm_buff;
batadv_ogm_packet->ttl = BATADV_TTL;
unlock:
mutex_unlock(&hard_iface->bat_iv.ogm_buff_mutex);
}
/* 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 += get_random_u32_below(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(get_random_u32_below(BATADV_JITTER / 2));
}
/* apply hop penalty for a normal link */
static u8 batadv_hop_penalty(u8 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;
}
/**
* batadv_iv_ogm_aggr_packet() - checks if there is another OGM attached
* @buff_pos: current position in the skb
* @packet_len: total length of the skb
* @ogm_packet: potential OGM in buffer
*
* Return: true if there is enough space for another OGM, false otherwise.
*/
static bool
batadv_iv_ogm_aggr_packet(int buff_pos, int packet_len,
const struct batadv_ogm_packet *ogm_packet)
{
int next_buff_pos = 0;
/* check if there is enough space for the header */
next_buff_pos += buff_pos + sizeof(*ogm_packet);
if (next_buff_pos > packet_len)
return false;
/* check if there is enough space for the optional TVLV */
next_buff_pos += ntohs(ogm_packet->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;
u8 packet_num;
s16 buff_pos;
struct batadv_ogm_packet *batadv_ogm_packet;
struct sk_buff *skb;
u8 *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)) {
/* 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_broadcast_skb(skb, hard_iface);
}
}
/* send a batman ogm packet */
static void batadv_iv_ogm_emit(struct batadv_forw_packet *forw_packet)
{
struct net_device *soft_iface;
if (!forw_packet->if_incoming) {
pr_err("Error - can't forward packet: incoming iface not specified\n");
return;
}
soft_iface = forw_packet->if_incoming->soft_iface;
if (WARN_ON(!forw_packet->if_outgoing))
return;
if (forw_packet->if_outgoing->soft_iface != soft_iface) {
pr_warn("%s: soft interface switch for queued OGM\n", __func__);
return;
}
if (forw_packet->if_incoming->if_status != BATADV_IF_ACTIVE)
return;
/* only for one specific outgoing interface */
batadv_iv_ogm_send_to_if(forw_packet, forw_packet->if_outgoing);
}
/**
* 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
*
* Return: 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 won't 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:
batadv_hardif_put(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;
struct sk_buff *skb;
unsigned char *skb_buff;
unsigned int skb_size;
atomic_t *queue_left = own_packet ? NULL : &bat_priv->batman_queue_left;
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;
skb = netdev_alloc_skb_ip_align(NULL, skb_size);
if (!skb)
return;
forw_packet_aggr = batadv_forw_packet_alloc(if_incoming, if_outgoing,
queue_left, bat_priv, skb);
if (!forw_packet_aggr) {
kfree_skb(skb);
return;
}
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->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;
INIT_DELAYED_WORK(&forw_packet_aggr->delayed_work,
batadv_iv_send_outstanding_bat_ogm_packet);
batadv_forw_packet_ogmv1_queue(bat_priv, forw_packet_aggr, send_time);
}
/* 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 long new_direct_link_flag;
skb_put_data(forw_packet_aggr->skb, 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);
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);
u16 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);
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;
struct batadv_orig_ifinfo *orig_ifinfo;
unsigned long *word;
u32 i;
u8 *w;
for (i = 0; i < hash->size; i++) {
head = &hash->table[i];
rcu_read_lock();
hlist_for_each_entry_rcu(orig_node, head, hash_entry) {
hlist_for_each_entry_rcu(orig_ifinfo,
&orig_node->ifinfo_list,
list) {
if (orig_ifinfo->if_outgoing != hard_iface)
continue;
spin_lock_bh(&orig_node->bat_iv.ogm_cnt_lock);
word = orig_ifinfo->bat_iv.bcast_own;
batadv_bit_get_packet(bat_priv, word, 1, 0);
w = &orig_ifinfo->bat_iv.bcast_own_sum;
*w = bitmap_weight(word,
BATADV_TQ_LOCAL_WINDOW_SIZE);
spin_unlock_bh(&orig_node->bat_iv.ogm_cnt_lock);
}
}
rcu_read_unlock();
}
}
/**
* batadv_iv_ogm_schedule_buff() - schedule submission of hardif ogm buffer
* @hard_iface: interface whose ogm buffer should be transmitted
*/
static void batadv_iv_ogm_schedule_buff(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;
u32 seqno;
u16 tvlv_len = 0;
unsigned long send_time;
lockdep_assert_held(&hard_iface->bat_iv.ogm_buff_mutex);
/* interface already disabled by batadv_iv_ogm_iface_disable */
if (!*ogm_buff)
return;
/* the interface gets activated here to avoid race conditions between
* the moment of activating the interface in
* hardif_activate_interface() where the originator mac is set and
* outdated packets (especially uninitialized mac addresses) in the
* packet queue
*/
if (hard_iface->if_status == BATADV_IF_TO_BE_ACTIVATED)
hard_iface->if_status = BATADV_IF_ACTIVE;
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 = (u32)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;
if (!kref_get_unless_zero(&tmp_hard_iface->refcount))
continue;
batadv_iv_ogm_queue_add(bat_priv, *ogm_buff,
*ogm_buff_len, hard_iface,
tmp_hard_iface, 1, send_time);
batadv_hardif_put(tmp_hard_iface);
}
rcu_read_unlock();
out:
batadv_hardif_put(primary_if);
}
static void batadv_iv_ogm_schedule(struct batadv_hard_iface *hard_iface)
{
if (hard_iface->if_status == BATADV_IF_NOT_IN_USE ||
hard_iface->if_status == BATADV_IF_TO_BE_REMOVED)
return;
mutex_lock(&hard_iface->bat_iv.ogm_buff_mutex);
batadv_iv_ogm_schedule_buff(hard_iface);
mutex_unlock(&hard_iface->bat_iv.ogm_buff_mutex);
}
/**
* batadv_iv_orig_ifinfo_sum() - Get bcast_own sum for originator over interface
* @orig_node: originator which reproadcasted the OGMs directly
* @if_outgoing: interface which transmitted the original OGM and received the
* direct rebroadcast
*
* Return: Number of replied (rebroadcasted) OGMs which were transmitted by
* an originator and directly (without intermediate hop) received by a specific
* interface
*/
static u8 batadv_iv_orig_ifinfo_sum(struct batadv_orig_node *orig_node,
struct batadv_hard_iface *if_outgoing)
{
struct batadv_orig_ifinfo *orig_ifinfo;
u8 sum;
orig_ifinfo = batadv_orig_ifinfo_get(orig_node, if_outgoing);
if (!orig_ifinfo)
return 0;
spin_lock_bh(&orig_node->bat_iv.ogm_cnt_lock);
sum = orig_ifinfo->bat_iv.bcast_own_sum;
spin_unlock_bh(&orig_node->bat_iv.ogm_cnt_lock);
batadv_orig_ifinfo_put(orig_ifinfo);
return sum;
}
/**
* 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;
struct batadv_neigh_node *tmp_neigh_node = NULL;
struct batadv_neigh_node *router = NULL;
u8 sum_orig, sum_neigh;
u8 *neigh_addr;
u8 tq_avg;
batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
"%s(): Searching and updating originator entry of received packet\n",
__func__);
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 &&
kref_get_unless_zero(&tmp_neigh_node->refcount)) {
if (WARN(neigh_node, "too many matching neigh_nodes"))
batadv_neigh_node_put(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_put(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_put(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) {
sum_orig = batadv_iv_orig_ifinfo_sum(router->orig_node,
router->if_incoming);
sum_neigh = batadv_iv_orig_ifinfo_sum(neigh_node->orig_node,
neigh_node->if_incoming);
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:
batadv_neigh_node_put(neigh_node);
batadv_neigh_node_put(router);
batadv_neigh_ifinfo_put(neigh_ifinfo);
batadv_neigh_ifinfo_put(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
*
* Return: true if the link can be considered bidirectional, false otherwise
*/
static bool 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;
u8 total_count;
u8 orig_eq_count, neigh_rq_count, neigh_rq_inv, tq_own;
unsigned int tq_iface_hop_penalty = BATADV_TQ_MAX_VALUE;
unsigned int neigh_rq_inv_cube, neigh_rq_max_cube;
unsigned int tq_asym_penalty, inv_asym_penalty;
unsigned int combined_tq;
bool ret = false;
/* 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 (!kref_get_unless_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 */
orig_eq_count = batadv_iv_orig_ifinfo_sum(orig_neigh_node, if_incoming);
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_put(neigh_ifinfo);
} else {
neigh_rq_count = 0;
}
/* 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;
tq_iface_hop_penalty -= atomic_read(&if_incoming->hop_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.
*/
if (if_outgoing && if_incoming == if_outgoing &&
batadv_is_wifi_hardif(if_outgoing))
tq_iface_hop_penalty = batadv_hop_penalty(tq_iface_hop_penalty,
bat_priv);
combined_tq = batadv_ogm_packet->tq *
tq_own *
tq_asym_penalty *
tq_iface_hop_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 = %pM neigh = %pM => own_bcast = %2i, real recv = %2i, local tq: %3i, asym_penalty: %3i, iface_hop_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_hop_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 = true;
out:
batadv_neigh_node_put(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
*
* Return: 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;
bool is_dup;
s32 seq_diff;
bool need_update = false;
int set_mark;
enum batadv_dup_status ret = BATADV_NO_DUP;
u32 seqno = ntohl(batadv_ogm_packet->seqno);
u8 *neigh_addr;
u8 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_put(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,
BATADV_TQ_LOCAL_WINDOW_SIZE,
&orig_ifinfo->batman_seqno_reset, NULL)) {
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_put(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_put(orig_node);
batadv_orig_ifinfo_put(orig_ifinfo);
return ret;
}
/**
* batadv_iv_ogm_process_per_outif() - process a batman iv OGM for an outgoing
* interface
* @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_hardif_neigh_node *hardif_neigh = NULL;
struct batadv_neigh_node *router = NULL;
struct batadv_neigh_node *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;
u8 *prev_sender;
bool 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;
}
if (is_single_hop_neigh) {
hardif_neigh = batadv_hardif_neigh_get(if_incoming,
ethhdr->h_source);
if (hardif_neigh)
hardif_neigh->last_seen = jiffies;
}
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_put(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_put(orig_neigh_node);
out:
batadv_neigh_ifinfo_put(router_ifinfo);
batadv_neigh_node_put(router);
batadv_neigh_node_put(router_router);
batadv_neigh_node_put(orig_neigh_router);
batadv_hardif_neigh_put(hardif_neigh);
consume_skb(skb_priv);
}
/**
* batadv_iv_ogm_process_reply() - Check OGM for direct reply and process it
* @ogm_packet: rebroadcast OGM packet to process
* @if_incoming: the interface where this packet was received
* @orig_node: originator which reproadcasted the OGMs
* @if_incoming_seqno: OGM sequence number when rebroadcast was received
*/
static void batadv_iv_ogm_process_reply(struct batadv_ogm_packet *ogm_packet,
struct batadv_hard_iface *if_incoming,
struct batadv_orig_node *orig_node,
u32 if_incoming_seqno)
{
struct batadv_orig_ifinfo *orig_ifinfo;
s32 bit_pos;
u8 *weight;
/* neighbor has to indicate direct link and it has to
* come via the corresponding interface
*/
if (!(ogm_packet->flags & BATADV_DIRECTLINK))
return;
if (!batadv_compare_eth(if_incoming->net_dev->dev_addr,
ogm_packet->orig))
return;
orig_ifinfo = batadv_orig_ifinfo_get(orig_node, if_incoming);
if (!orig_ifinfo)
return;
/* save packet seqno for bidirectional check */
spin_lock_bh(&orig_node->bat_iv.ogm_cnt_lock);
bit_pos = if_incoming_seqno - 2;
bit_pos -= ntohl(ogm_packet->seqno);
batadv_set_bit(orig_ifinfo->bat_iv.bcast_own, bit_pos);
weight = &orig_ifinfo->bat_iv.bcast_own_sum;
*weight = bitmap_weight(orig_ifinfo->bat_iv.bcast_own,
BATADV_TQ_LOCAL_WINDOW_SIZE);
spin_unlock_bh(&orig_node->bat_iv.ogm_cnt_lock);
batadv_orig_ifinfo_put(orig_ifinfo);
}
/**
* 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 received
*/
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;
u32 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) {
orig_neigh_node = batadv_iv_ogm_orig_get(bat_priv,
ethhdr->h_source);
if (!orig_neigh_node)
return;
batadv_iv_ogm_process_reply(ogm_packet, if_incoming,
orig_neigh_node, if_incoming_seqno);
batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
"Drop packet: originator packet from myself (via neighbor)\n");
batadv_orig_node_put(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;
if (!kref_get_unless_zero(&hard_iface->refcount))
continue;
batadv_iv_ogm_process_per_outif(skb, ogm_offset, orig_node,
if_incoming, hard_iface);
batadv_hardif_put(hard_iface);
}
rcu_read_unlock();
batadv_orig_node_put(orig_node);
}
static void batadv_iv_send_outstanding_bat_ogm_packet(struct work_struct *work)
{
struct delayed_work *delayed_work;
struct batadv_forw_packet *forw_packet;
struct batadv_priv *bat_priv;
bool dropped = false;
delayed_work = to_delayed_work(work);
forw_packet = container_of(delayed_work, struct batadv_forw_packet,
delayed_work);
bat_priv = netdev_priv(forw_packet->if_incoming->soft_iface);
if (atomic_read(&bat_priv->mesh_state) == BATADV_MESH_DEACTIVATING) {
dropped = true;
goto out;
}
batadv_iv_ogm_emit(forw_packet);
/* we have to have at least one packet in the queue to determine the
* queues wake up time unless we are shutting down.
*
* only re-schedule if this is the "original" copy, e.g. the OGM of the
* primary interface should only be rescheduled once per period, but
* this function will be called for the forw_packet instances of the
* other secondary interfaces as well.
*/
if (forw_packet->own &&
forw_packet->if_incoming == forw_packet->if_outgoing)
batadv_iv_ogm_schedule(forw_packet->if_incoming);
out:
/* do we get something for free()? */
if (batadv_forw_packet_steal(forw_packet,
&bat_priv->forw_bat_list_lock))
batadv_forw_packet_free(forw_packet, dropped);
}
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;
u8 *packet_pos;
int ogm_offset;
bool res;
int ret = NET_RX_DROP;
res = batadv_check_management_packet(skb, if_incoming, BATADV_OGM_HLEN);
if (!res)
goto free_skb;
/* 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->algo_ops->iface.enable != batadv_iv_ogm_iface_enable)
goto free_skb;
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)) {
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;
}
ret = NET_RX_SUCCESS;
free_skb:
if (ret == NET_RX_SUCCESS)
consume_skb(skb);
else
kfree_skb(skb);
return ret;
}
/**
* batadv_iv_ogm_neigh_get_tq_avg() - Get the TQ average for a neighbour on a
* given outgoing interface.
* @neigh_node: Neighbour of interest
* @if_outgoing: Outgoing interface of interest
* @tq_avg: Pointer of where to store the TQ average
*
* Return: False if no average TQ available, otherwise true.
*/
static bool
batadv_iv_ogm_neigh_get_tq_avg(struct batadv_neigh_node *neigh_node,
struct batadv_hard_iface *if_outgoing,
u8 *tq_avg)
{
struct batadv_neigh_ifinfo *n_ifinfo;
n_ifinfo = batadv_neigh_ifinfo_get(neigh_node, if_outgoing);
if (!n_ifinfo)
return false;
*tq_avg = n_ifinfo->bat_iv.tq_avg;
batadv_neigh_ifinfo_put(n_ifinfo);
return true;
}
/**
* batadv_iv_ogm_orig_dump_subentry() - Dump an originator subentry into a
* message
* @msg: Netlink message to dump into
* @portid: Port making netlink request
* @seq: Sequence number of netlink message
* @bat_priv: The bat priv with all the soft interface information
* @if_outgoing: Limit dump to entries with this outgoing interface
* @orig_node: Originator to dump
* @neigh_node: Single hops neighbour
* @best: Is the best originator
*
* Return: Error code, or 0 on success
*/
static int
batadv_iv_ogm_orig_dump_subentry(struct sk_buff *msg, u32 portid, u32 seq,
struct batadv_priv *bat_priv,
struct batadv_hard_iface *if_outgoing,
struct batadv_orig_node *orig_node,
struct batadv_neigh_node *neigh_node,
bool best)
{
void *hdr;
u8 tq_avg;
unsigned int last_seen_msecs;
last_seen_msecs = jiffies_to_msecs(jiffies - orig_node->last_seen);
if (!batadv_iv_ogm_neigh_get_tq_avg(neigh_node, if_outgoing, &tq_avg))
return 0;
if (if_outgoing != BATADV_IF_DEFAULT &&
if_outgoing != neigh_node->if_incoming)
return 0;
hdr = genlmsg_put(msg, portid, seq, &batadv_netlink_family,
NLM_F_MULTI, BATADV_CMD_GET_ORIGINATORS);
if (!hdr)
return -ENOBUFS;
if (nla_put(msg, BATADV_ATTR_ORIG_ADDRESS, ETH_ALEN,
orig_node->orig) ||
nla_put(msg, BATADV_ATTR_NEIGH_ADDRESS, ETH_ALEN,
neigh_node->addr) ||
nla_put_string(msg, BATADV_ATTR_HARD_IFNAME,
neigh_node->if_incoming->net_dev->name) ||
nla_put_u32(msg, BATADV_ATTR_HARD_IFINDEX,
neigh_node->if_incoming->net_dev->ifindex) ||
nla_put_u8(msg, BATADV_ATTR_TQ, tq_avg) ||
nla_put_u32(msg, BATADV_ATTR_LAST_SEEN_MSECS,
last_seen_msecs))
goto nla_put_failure;
if (best && nla_put_flag(msg, BATADV_ATTR_FLAG_BEST))
goto nla_put_failure;
genlmsg_end(msg, hdr);
return 0;
nla_put_failure:
genlmsg_cancel(msg, hdr);
return -EMSGSIZE;
}
/**
* batadv_iv_ogm_orig_dump_entry() - Dump an originator entry into a message
* @msg: Netlink message to dump into
* @portid: Port making netlink request
* @seq: Sequence number of netlink message
* @bat_priv: The bat priv with all the soft interface information
* @if_outgoing: Limit dump to entries with this outgoing interface
* @orig_node: Originator to dump
* @sub_s: Number of sub entries to skip
*
* This function assumes the caller holds rcu_read_lock().
*
* Return: Error code, or 0 on success
*/
static int
batadv_iv_ogm_orig_dump_entry(struct sk_buff *msg, u32 portid, u32 seq,
struct batadv_priv *bat_priv,
struct batadv_hard_iface *if_outgoing,
struct batadv_orig_node *orig_node, int *sub_s)
{
struct batadv_neigh_node *neigh_node_best;
struct batadv_neigh_node *neigh_node;
int sub = 0;
bool best;
u8 tq_avg_best;
neigh_node_best = batadv_orig_router_get(orig_node, if_outgoing);
if (!neigh_node_best)
goto out;
if (!batadv_iv_ogm_neigh_get_tq_avg(neigh_node_best, if_outgoing,
&tq_avg_best))
goto out;
if (tq_avg_best == 0)
goto out;
hlist_for_each_entry_rcu(neigh_node, &orig_node->neigh_list, list) {
if (sub++ < *sub_s)
continue;
best = (neigh_node == neigh_node_best);
if (batadv_iv_ogm_orig_dump_subentry(msg, portid, seq,
bat_priv, if_outgoing,
orig_node, neigh_node,
best)) {
batadv_neigh_node_put(neigh_node_best);
*sub_s = sub - 1;
return -EMSGSIZE;
}
}
out:
batadv_neigh_node_put(neigh_node_best);
*sub_s = 0;
return 0;
}
/**
* batadv_iv_ogm_orig_dump_bucket() - Dump an originator bucket into a
* message
* @msg: Netlink message to dump into
* @portid: Port making netlink request
* @seq: Sequence number of netlink message
* @bat_priv: The bat priv with all the soft interface information
* @if_outgoing: Limit dump to entries with this outgoing interface
* @head: Bucket to be dumped
* @idx_s: Number of entries to be skipped
* @sub: Number of sub entries to be skipped
*
* Return: Error code, or 0 on success
*/
static int
batadv_iv_ogm_orig_dump_bucket(struct sk_buff *msg, u32 portid, u32 seq,
struct batadv_priv *bat_priv,
struct batadv_hard_iface *if_outgoing,
struct hlist_head *head, int *idx_s, int *sub)
{
struct batadv_orig_node *orig_node;
int idx = 0;
rcu_read_lock();
hlist_for_each_entry_rcu(orig_node, head, hash_entry) {
if (idx++ < *idx_s)
continue;
if (batadv_iv_ogm_orig_dump_entry(msg, portid, seq, bat_priv,
if_outgoing, orig_node,
sub)) {
rcu_read_unlock();
*idx_s = idx - 1;
return -EMSGSIZE;
}
}
rcu_read_unlock();
*idx_s = 0;
*sub = 0;
return 0;
}
/**
* batadv_iv_ogm_orig_dump() - Dump the originators into a message
* @msg: Netlink message to dump into
* @cb: Control block containing additional options
* @bat_priv: The bat priv with all the soft interface information
* @if_outgoing: Limit dump to entries with this outgoing interface
*/
static void
batadv_iv_ogm_orig_dump(struct sk_buff *msg, struct netlink_callback *cb,
struct batadv_priv *bat_priv,
struct batadv_hard_iface *if_outgoing)
{
struct batadv_hashtable *hash = bat_priv->orig_hash;
struct hlist_head *head;
int bucket = cb->args[0];
int idx = cb->args[1];
int sub = cb->args[2];
int portid = NETLINK_CB(cb->skb).portid;
while (bucket < hash->size) {
head = &hash->table[bucket];
if (batadv_iv_ogm_orig_dump_bucket(msg, portid,
cb->nlh->nlmsg_seq,
bat_priv, if_outgoing, head,
&idx, &sub))
break;
bucket++;
}
cb->args[0] = bucket;
cb->args[1] = idx;
cb->args[2] = sub;
}
/**
* batadv_iv_ogm_neigh_diff() - calculate tq difference 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
* @diff: pointer to integer receiving the calculated difference
*
* The content of *@diff is only valid when this function returns true.
* It is less, equal to or greater than 0 if the metric via neigh1 is lower,
* the same as or higher than the metric via neigh2
*
* Return: true when the difference could be calculated, false otherwise
*/
static bool batadv_iv_ogm_neigh_diff(struct batadv_neigh_node *neigh1,
struct batadv_hard_iface *if_outgoing1,
struct batadv_neigh_node *neigh2,
struct batadv_hard_iface *if_outgoing2,
int *diff)
{
struct batadv_neigh_ifinfo *neigh1_ifinfo, *neigh2_ifinfo;
u8 tq1, tq2;
bool ret = true;
neigh1_ifinfo = batadv_neigh_ifinfo_get(neigh1, if_outgoing1);
neigh2_ifinfo = batadv_neigh_ifinfo_get(neigh2, if_outgoing2);
if (!neigh1_ifinfo || !neigh2_ifinfo) {
ret = false;
goto out;
}
tq1 = neigh1_ifinfo->bat_iv.tq_avg;
tq2 = neigh2_ifinfo->bat_iv.tq_avg;
*diff = (int)tq1 - (int)tq2;
out:
batadv_neigh_ifinfo_put(neigh1_ifinfo);
batadv_neigh_ifinfo_put(neigh2_ifinfo);
return ret;
}
/**
* batadv_iv_ogm_neigh_dump_neigh() - Dump a neighbour into a netlink message
* @msg: Netlink message to dump into
* @portid: Port making netlink request
* @seq: Sequence number of netlink message
* @hardif_neigh: Neighbour to be dumped
*
* Return: Error code, or 0 on success
*/
static int
batadv_iv_ogm_neigh_dump_neigh(struct sk_buff *msg, u32 portid, u32 seq,
struct batadv_hardif_neigh_node *hardif_neigh)
{
void *hdr;
unsigned int last_seen_msecs;
last_seen_msecs = jiffies_to_msecs(jiffies - hardif_neigh->last_seen);
hdr = genlmsg_put(msg, portid, seq, &batadv_netlink_family,
NLM_F_MULTI, BATADV_CMD_GET_NEIGHBORS);
if (!hdr)
return -ENOBUFS;
if (nla_put(msg, BATADV_ATTR_NEIGH_ADDRESS, ETH_ALEN,
hardif_neigh->addr) ||
nla_put_string(msg, BATADV_ATTR_HARD_IFNAME,
hardif_neigh->if_incoming->net_dev->name) ||
nla_put_u32(msg, BATADV_ATTR_HARD_IFINDEX,
hardif_neigh->if_incoming->net_dev->ifindex) ||
nla_put_u32(msg, BATADV_ATTR_LAST_SEEN_MSECS,
last_seen_msecs))
goto nla_put_failure;
genlmsg_end(msg, hdr);
return 0;
nla_put_failure:
genlmsg_cancel(msg, hdr);
return -EMSGSIZE;
}
/**
* batadv_iv_ogm_neigh_dump_hardif() - Dump the neighbours of a hard interface
* into a message
* @msg: Netlink message to dump into
* @portid: Port making netlink request
* @seq: Sequence number of netlink message
* @bat_priv: The bat priv with all the soft interface information
* @hard_iface: Hard interface to dump the neighbours for
* @idx_s: Number of entries to skip
*
* This function assumes the caller holds rcu_read_lock().
*
* Return: Error code, or 0 on success
*/
static int
batadv_iv_ogm_neigh_dump_hardif(struct sk_buff *msg, u32 portid, u32 seq,
struct batadv_priv *bat_priv,
struct batadv_hard_iface *hard_iface,
int *idx_s)
{
struct batadv_hardif_neigh_node *hardif_neigh;
int idx = 0;
hlist_for_each_entry_rcu(hardif_neigh,
&hard_iface->neigh_list, list) {
if (idx++ < *idx_s)
continue;
if (batadv_iv_ogm_neigh_dump_neigh(msg, portid, seq,
hardif_neigh)) {
*idx_s = idx - 1;
return -EMSGSIZE;
}
}
*idx_s = 0;
return 0;
}
/**
* batadv_iv_ogm_neigh_dump() - Dump the neighbours into a message
* @msg: Netlink message to dump into
* @cb: Control block containing additional options
* @bat_priv: The bat priv with all the soft interface information
* @single_hardif: Limit dump to this hard interface
*/
static void
batadv_iv_ogm_neigh_dump(struct sk_buff *msg, struct netlink_callback *cb,
struct batadv_priv *bat_priv,
struct batadv_hard_iface *single_hardif)
{
struct batadv_hard_iface *hard_iface;
int i_hardif = 0;
int i_hardif_s = cb->args[0];
int idx = cb->args[1];
int portid = NETLINK_CB(cb->skb).portid;
rcu_read_lock();
if (single_hardif) {
if (i_hardif_s == 0) {
if (batadv_iv_ogm_neigh_dump_hardif(msg, portid,
cb->nlh->nlmsg_seq,
bat_priv,
single_hardif,
&idx) == 0)
i_hardif++;
}
} else {
list_for_each_entry_rcu(hard_iface, &batadv_hardif_list,
list) {
if (hard_iface->soft_iface != bat_priv->soft_iface)
continue;
if (i_hardif++ < i_hardif_s)
continue;
if (batadv_iv_ogm_neigh_dump_hardif(msg, portid,
cb->nlh->nlmsg_seq,
bat_priv,
hard_iface, &idx)) {
i_hardif--;
break;
}
}
}
rcu_read_unlock();
cb->args[0] = i_hardif;
cb->args[1] = idx;
}
/**
* 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
*
* Return: 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)
{
bool ret;
int diff;
ret = batadv_iv_ogm_neigh_diff(neigh1, if_outgoing1, neigh2,
if_outgoing2, &diff);
if (!ret)
return 0;
return diff;
}
/**
* batadv_iv_ogm_neigh_is_sob() - check if neigh1 is similarly 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
*
* Return: 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_sob(struct batadv_neigh_node *neigh1,
struct batadv_hard_iface *if_outgoing1,
struct batadv_neigh_node *neigh2,
struct batadv_hard_iface *if_outgoing2)
{
bool ret;
int diff;
ret = batadv_iv_ogm_neigh_diff(neigh1, if_outgoing1, neigh2,
if_outgoing2, &diff);
if (!ret)
return false;
ret = diff > -BATADV_TQ_SIMILARITY_THRESHOLD;
return ret;
}
static void batadv_iv_iface_enabled(struct batadv_hard_iface *hard_iface)
{
/* begin scheduling originator messages on that interface */
batadv_iv_ogm_schedule(hard_iface);
}
/**
* batadv_iv_init_sel_class() - initialize GW selection class
* @bat_priv: the bat priv with all the soft interface information
*/
static void batadv_iv_init_sel_class(struct batadv_priv *bat_priv)
{
/* set default TQ difference threshold to 20 */
atomic_set(&bat_priv->gw.sel_class, 20);
}
static struct batadv_gw_node *
batadv_iv_gw_get_best_gw_node(struct batadv_priv *bat_priv)
{
struct batadv_neigh_node *router;
struct batadv_neigh_ifinfo *router_ifinfo;
struct batadv_gw_node *gw_node, *curr_gw = NULL;
u64 max_gw_factor = 0;
u64 tmp_gw_factor = 0;
u8 max_tq = 0;
u8 tq_avg;
struct batadv_orig_node *orig_node;
rcu_read_lock();
hlist_for_each_entry_rcu(gw_node, &bat_priv->gw.gateway_list, list) {
orig_node = gw_node->orig_node;
router = batadv_orig_router_get(orig_node, BATADV_IF_DEFAULT);
if (!router)
continue;
router_ifinfo = batadv_neigh_ifinfo_get(router,
BATADV_IF_DEFAULT);
if (!router_ifinfo)
goto next;
if (!kref_get_unless_zero(&gw_node->refcount))
goto next;
tq_avg = router_ifinfo->bat_iv.tq_avg;
switch (atomic_read(&bat_priv->gw.sel_class)) {
case 1: /* fast connection */
tmp_gw_factor = tq_avg * tq_avg;
tmp_gw_factor *= gw_node->bandwidth_down;
tmp_gw_factor *= 100 * 100;
tmp_gw_factor >>= 18;
if (tmp_gw_factor > max_gw_factor ||
(tmp_gw_factor == max_gw_factor &&
tq_avg > max_tq)) {
batadv_gw_node_put(curr_gw);
curr_gw = gw_node;
kref_get(&curr_gw->refcount);
}
break;
default: /* 2: stable connection (use best statistic)
* 3: fast-switch (use best statistic but change as
* soon as a better gateway appears)
* XX: late-switch (use best statistic but change as
* soon as a better gateway appears which has
* $routing_class more tq points)
*/
if (tq_avg > max_tq) {
batadv_gw_node_put(curr_gw);
curr_gw = gw_node;
kref_get(&curr_gw->refcount);
}
break;
}
if (tq_avg > max_tq)
max_tq = tq_avg;
if (tmp_gw_factor > max_gw_factor)
max_gw_factor = tmp_gw_factor;
batadv_gw_node_put(gw_node);
next:
batadv_neigh_node_put(router);
batadv_neigh_ifinfo_put(router_ifinfo);
}
rcu_read_unlock();
return curr_gw;
}
static bool batadv_iv_gw_is_eligible(struct batadv_priv *bat_priv,
struct batadv_orig_node *curr_gw_orig,
struct batadv_orig_node *orig_node)
{
struct batadv_neigh_ifinfo *router_orig_ifinfo = NULL;
struct batadv_neigh_ifinfo *router_gw_ifinfo = NULL;
struct batadv_neigh_node *router_gw = NULL;
struct batadv_neigh_node *router_orig = NULL;
u8 gw_tq_avg, orig_tq_avg;
bool ret = false;
/* dynamic re-election is performed only on fast or late switch */
if (atomic_read(&bat_priv->gw.sel_class) <= 2)
return false;
router_gw = batadv_orig_router_get(curr_gw_orig, BATADV_IF_DEFAULT);
if (!router_gw) {
ret = true;
goto out;
}
router_gw_ifinfo = batadv_neigh_ifinfo_get(router_gw,
BATADV_IF_DEFAULT);
if (!router_gw_ifinfo) {
ret = true;
goto out;
}
router_orig = batadv_orig_router_get(orig_node, BATADV_IF_DEFAULT);
if (!router_orig)
goto out;
router_orig_ifinfo = batadv_neigh_ifinfo_get(router_orig,
BATADV_IF_DEFAULT);
if (!router_orig_ifinfo)
goto out;
gw_tq_avg = router_gw_ifinfo->bat_iv.tq_avg;
orig_tq_avg = router_orig_ifinfo->bat_iv.tq_avg;
/* the TQ value has to be better */
if (orig_tq_avg < gw_tq_avg)
goto out;
/* if the routing class is greater than 3 the value tells us how much
* greater the TQ value of the new gateway must be
*/
if ((atomic_read(&bat_priv->gw.sel_class) > 3) &&
(orig_tq_avg - gw_tq_avg < atomic_read(&bat_priv->gw.sel_class)))
goto out;
batadv_dbg(BATADV_DBG_BATMAN, bat_priv,
"Restarting gateway selection: better gateway found (tq curr: %i, tq new: %i)\n",
gw_tq_avg, orig_tq_avg);
ret = true;
out:
batadv_neigh_ifinfo_put(router_gw_ifinfo);
batadv_neigh_ifinfo_put(router_orig_ifinfo);
batadv_neigh_node_put(router_gw);
batadv_neigh_node_put(router_orig);
return ret;
}
/**
* batadv_iv_gw_dump_entry() - Dump a gateway into a message
* @msg: Netlink message to dump into
* @portid: Port making netlink request
* @cb: Control block containing additional options
* @bat_priv: The bat priv with all the soft interface information
* @gw_node: Gateway to be dumped
*
* Return: Error code, or 0 on success
*/
static int batadv_iv_gw_dump_entry(struct sk_buff *msg, u32 portid,
struct netlink_callback *cb,
struct batadv_priv *bat_priv,
struct batadv_gw_node *gw_node)
{
struct batadv_neigh_ifinfo *router_ifinfo = NULL;
struct batadv_neigh_node *router;
struct batadv_gw_node *curr_gw = NULL;
int ret = 0;
void *hdr;
router = batadv_orig_router_get(gw_node->orig_node, BATADV_IF_DEFAULT);
if (!router)
goto out;
router_ifinfo = batadv_neigh_ifinfo_get(router, BATADV_IF_DEFAULT);
if (!router_ifinfo)
goto out;
curr_gw = batadv_gw_get_selected_gw_node(bat_priv);
hdr = genlmsg_put(msg, portid, cb->nlh->nlmsg_seq,
&batadv_netlink_family, NLM_F_MULTI,
BATADV_CMD_GET_GATEWAYS);
if (!hdr) {
ret = -ENOBUFS;
goto out;
}
genl_dump_check_consistent(cb, hdr);
ret = -EMSGSIZE;
if (curr_gw == gw_node)
if (nla_put_flag(msg, BATADV_ATTR_FLAG_BEST)) {
genlmsg_cancel(msg, hdr);
goto out;
}
if (nla_put(msg, BATADV_ATTR_ORIG_ADDRESS, ETH_ALEN,
gw_node->orig_node->orig) ||
nla_put_u8(msg, BATADV_ATTR_TQ, router_ifinfo->bat_iv.tq_avg) ||
nla_put(msg, BATADV_ATTR_ROUTER, ETH_ALEN,
router->addr) ||
nla_put_string(msg, BATADV_ATTR_HARD_IFNAME,
router->if_incoming->net_dev->name) ||
nla_put_u32(msg, BATADV_ATTR_HARD_IFINDEX,
router->if_incoming->net_dev->ifindex) ||
nla_put_u32(msg, BATADV_ATTR_BANDWIDTH_DOWN,
gw_node->bandwidth_down) ||
nla_put_u32(msg, BATADV_ATTR_BANDWIDTH_UP,
gw_node->bandwidth_up)) {
genlmsg_cancel(msg, hdr);
goto out;
}
genlmsg_end(msg, hdr);
ret = 0;
out:
batadv_gw_node_put(curr_gw);
batadv_neigh_ifinfo_put(router_ifinfo);
batadv_neigh_node_put(router);
return ret;
}
/**
* batadv_iv_gw_dump() - Dump gateways into a message
* @msg: Netlink message to dump into
* @cb: Control block containing additional options
* @bat_priv: The bat priv with all the soft interface information
*/
static void batadv_iv_gw_dump(struct sk_buff *msg, struct netlink_callback *cb,
struct batadv_priv *bat_priv)
{
int portid = NETLINK_CB(cb->skb).portid;
struct batadv_gw_node *gw_node;
int idx_skip = cb->args[0];
int idx = 0;
spin_lock_bh(&bat_priv->gw.list_lock);
cb->seq = bat_priv->gw.generation << 1 | 1;
hlist_for_each_entry(gw_node, &bat_priv->gw.gateway_list, list) {
if (idx++ < idx_skip)
continue;
if (batadv_iv_gw_dump_entry(msg, portid, cb, bat_priv,
gw_node)) {
idx_skip = idx - 1;
goto unlock;
}
}
idx_skip = idx;
unlock:
spin_unlock_bh(&bat_priv->gw.list_lock);
cb->args[0] = idx_skip;
}
static struct batadv_algo_ops batadv_batman_iv __read_mostly = {
.name = "BATMAN_IV",
.iface = {
.enable = batadv_iv_ogm_iface_enable,
.enabled = batadv_iv_iface_enabled,
.disable = batadv_iv_ogm_iface_disable,
.update_mac = batadv_iv_ogm_iface_update_mac,
.primary_set = batadv_iv_ogm_primary_iface_set,
},
.neigh = {
.cmp = batadv_iv_ogm_neigh_cmp,
.is_similar_or_better = batadv_iv_ogm_neigh_is_sob,
.dump = batadv_iv_ogm_neigh_dump,
},
.orig = {
.dump = batadv_iv_ogm_orig_dump,
},
.gw = {
.init_sel_class = batadv_iv_init_sel_class,
.get_best_gw_node = batadv_iv_gw_get_best_gw_node,
.is_eligible = batadv_iv_gw_is_eligible,
.dump = batadv_iv_gw_dump,
},
};
/**
* batadv_iv_init() - B.A.T.M.A.N. IV initialization function
*
* Return: 0 on success or negative error number in case of failure
*/
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;
}