cregit-Linux how code gets into the kernel

Release 4.11 net/batman-adv/bat_iv_ogm.c

Directory: net/batman-adv
/* Copyright (C) 2007-2017  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 "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/errno.h>
#include <linux/etherdevice.h>
#include <linux/fs.h>
#include <linux/if_ether.h>
#include <linux/init.h>
#include <linux/jiffies.h>
#include <linux/kernel.h>
#include <linux/kref.h>
#include <linux/list.h>
#include <linux/lockdep.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/seq_file.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/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 "packet.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
 * @BATADV_NO_DUP: the packet is no 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(u8 lq_recv[], u8 *lq_index, u8 value)
{
	lq_recv[*lq_index] = value;
	*lq_index = (*lq_index + 1) % BATADV_TQ_GLOBAL_WINDOW_SIZE;
}


Contributors
PersonTokensPropCommitsCommitProp
Antonio Quartulli3491.89%150.00%


Sven Eckelmann38.11%150.00%


Total37100.00%2100.00%



/**
 * 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);
}


Contributors
PersonTokensPropCommitsCommitProp
Antonio Quartulli7689.41%133.33%


Sven Eckelmann78.24%133.33%


Markus Pargmann22.35%133.33%


Total85100.00%3100.00%



/**
 * 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);
}


Contributors
PersonTokensPropCommitsCommitProp
Antonio Quartulli29100.00%1100.00%


Total29100.00%1100.00%



/**
 * 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
 *
 * Return: 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(u8), GFP_ATOMIC);
	if (!data_ptr)
		goto unlock;

	memcpy(data_ptr, orig_node->bat_iv.bcast_own_sum,
	       (max_if_num - 1) * sizeof(u8));
	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;
}


Contributors
PersonTokensPropCommitsCommitProp
Antonio Quartulli18698.94%266.67%


Sven Eckelmann21.06%133.33%


Total188100.00%3100.00%



/**
 * batadv_iv_ogm_drop_bcast_own_entry - drop section of bcast_own
 * @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
 */


static void

batadv_iv_ogm_drop_bcast_own_entry(struct batadv_orig_node *orig_node,
				   int max_if_num, int del_if_num)
{
	size_t chunk_size;
	size_t if_offset;
	void *data_ptr;

	lockdep_assert_held(&orig_node->bat_iv.ogm_cnt_lock);

	chunk_size = sizeof(unsigned long) * BATADV_NUM_WORDS;
	data_ptr = kmalloc_array(max_if_num, chunk_size, GFP_ATOMIC);
	if (!data_ptr)
		/* use old buffer when new one could not be allocated */
		data_ptr = orig_node->bat_iv.bcast_own;

	/* copy first part */
	memmove(data_ptr, orig_node->bat_iv.bcast_own, del_if_num * chunk_size);

	/* copy second part */
	if_offset = (del_if_num + 1) * chunk_size;
	memmove((char *)data_ptr + del_if_num * chunk_size,
		(uint8_t *)orig_node->bat_iv.bcast_own + if_offset,
		(max_if_num - del_if_num) * chunk_size);

	/* bcast_own was shrunk down in new buffer; free old one */
	if (orig_node->bat_iv.bcast_own != data_ptr) {
		kfree(orig_node->bat_iv.bcast_own);
		orig_node->bat_iv.bcast_own = data_ptr;
	}
}


Contributors
PersonTokensPropCommitsCommitProp
Antonio Quartulli11570.99%250.00%


Sven Eckelmann4729.01%250.00%


Total162100.00%4100.00%



/**
 * batadv_iv_ogm_drop_bcast_own_sum_entry - drop section of bcast_own_sum
 * @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
 */


static void

batadv_iv_ogm_drop_bcast_own_sum_entry(struct batadv_orig_node *orig_node,
				       int max_if_num, int del_if_num)
{
	size_t if_offset;
	void *data_ptr;

	lockdep_assert_held(&orig_node->bat_iv.ogm_cnt_lock);

	data_ptr = kmalloc_array(max_if_num, sizeof(u8), GFP_ATOMIC);
	if (!data_ptr)
		/* use old buffer when new one could not be allocated */
		data_ptr = orig_node->bat_iv.bcast_own_sum;

	memmove(data_ptr, orig_node->bat_iv.bcast_own_sum,
		del_if_num * sizeof(u8));

	if_offset = (del_if_num + 1) * sizeof(u8);
	memmove((char *)data_ptr + del_if_num * sizeof(u8),
		orig_node->bat_iv.bcast_own_sum + if_offset,
		(max_if_num - del_if_num) * sizeof(u8));

	/* bcast_own_sum was shrunk down in new buffer; free old one */
	if (orig_node->bat_iv.bcast_own_sum != data_ptr) {
		kfree(orig_node->bat_iv.bcast_own_sum);
		orig_node->bat_iv.bcast_own_sum = data_ptr;
	}
}


Contributors
PersonTokensPropCommitsCommitProp
Antonio Quartulli10163.92%250.00%


Sven Eckelmann5736.08%250.00%


Total158100.00%4100.00%



/**
 * 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
 *
 * Return: 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)
{
	spin_lock_bh(&orig_node->bat_iv.ogm_cnt_lock);

	if (max_if_num == 0) {
		kfree(orig_node->bat_iv.bcast_own);
		kfree(orig_node->bat_iv.bcast_own_sum);
		orig_node->bat_iv.bcast_own = NULL;
		orig_node->bat_iv.bcast_own_sum = NULL;
	} else {
		batadv_iv_ogm_drop_bcast_own_entry(orig_node, max_if_num,
						   del_if_num);
		batadv_iv_ogm_drop_bcast_own_sum_entry(orig_node, max_if_num,
						       del_if_num);
	}

	spin_unlock_bh(&orig_node->bat_iv.ogm_cnt_lock);

	return 0;
}


Contributors
PersonTokensPropCommitsCommitProp
Sven Eckelmann8885.44%150.00%


Antonio Quartulli1514.56%150.00%


Total103100.00%2100.00%



/**
 * 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 exists it is created an 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 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(u8);
	orig_node->bat_iv.bcast_own_sum = kzalloc(size, GFP_ATOMIC);
	if (!orig_node->bat_iv.bcast_own_sum)
		goto free_orig_node;

	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:
	batadv_orig_node_put(orig_node);
free_orig_node:
	batadv_orig_node_put(orig_node);

	return NULL;
}


Contributors
PersonTokensPropCommitsCommitProp
Antonio Quartulli18390.15%233.33%


Sven Eckelmann167.88%350.00%


Simon Wunderlich41.97%116.67%


Total203100.00%6100.00%





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;
}


Contributors
PersonTokensPropCommitsCommitProp
Marek Lindner4977.78%337.50%


Sven Eckelmann711.11%337.50%


Simon Wunderlich69.52%112.50%


Al Viro11.59%112.50%


Total63100.00%8100.00%






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;

	/* 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;
}


Contributors
PersonTokensPropCommitsCommitProp
Marek Lindner10981.34%640.00%


Sven Eckelmann2014.93%853.33%


Markus Pargmann53.73%16.67%


Total134100.00%15100.00%






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;
}


Contributors
PersonTokensPropCommitsCommitProp
Marek Lindner2692.86%250.00%


Sven Eckelmann27.14%250.00%


Total28100.00%4100.00%






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);
}


Contributors
PersonTokensPropCommitsCommitProp
Marek Lindner5283.87%450.00%


Sven Eckelmann812.90%337.50%


Antonio Quartulli23.23%112.50%


Total62100.00%8100.00%





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->ttl = BATADV_TTL;
}


Contributors
PersonTokensPropCommitsCommitProp
Marek Lindner3480.95%450.00%


Sven Eckelmann819.05%450.00%


Total42100.00%8100.00%



/* 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);
}


Contributors
PersonTokensPropCommitsCommitProp
Marek Lindner2654.17%116.67%


Sven Eckelmann2041.67%350.00%


Akinobu Mita24.17%233.33%


Total48100.00%6100.00%



/* 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));
}


Contributors
PersonTokensPropCommitsCommitProp
Marek Lindner2187.50%125.00%


Sven Eckelmann28.33%250.00%


Akinobu Mita14.17%125.00%


Total24100.00%4100.00%



/* 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;
}


Contributors
PersonTokensPropCommitsCommitProp
Marek Lindner2963.04%120.00%


Sven Eckelmann1736.96%480.00%


Total46100.00%5100.00%



/**
 * 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
 * @tvlv_len: tvlv length of the previously considered OGM
 *
 * 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,
				      __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);
}


Contributors
PersonTokensPropCommitsCommitProp
Marek Lindner3473.91%228.57%


Sven Eckelmann1123.91%457.14%


Markus Pargmann12.17%114.29%


Total46100.00%7100.00%



/* 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->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_broadcast_skb(skb, hard_iface);
	}
}


Contributors
PersonTokensPropCommitsCommitProp
Marek Lindner20968.98%314.29%


Sven Eckelmann7223.76%1571.43%


Martin Hundeböll206.60%14.76%


Markus Pargmann10.33%14.76%


Antonio Quartulli10.33%14.76%


Total303100.00%21100.00%



/* 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 (WARN_ON(forw_packet->if_outgoing->soft_iface != soft_iface))
		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);
}


Contributors
PersonTokensPropCommitsCommitProp
Marek Lindner5564.71%228.57%


Simon Wunderlich2225.88%114.29%


Linus Lüssing44.71%114.29%


Sven Eckelmann44.71%342.86%


Total85100.00%7100.00%



/**
 * 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 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_put(primary_if);
	return res;
}


Contributors
PersonTokensPropCommitsCommitProp
Marek Lindner19171.54%110.00%


Sven Eckelmann3613.48%770.00%


Markus Pargmann3412.73%110.00%


Simon Wunderlich62.25%110.00%


Total267100.00%10100.00%



/**
 * 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;
	atomic_t *queue_left = own_packet ? NULL : &bat_priv->batman_queue_left;

	forw_packet_aggr = batadv_forw_packet_alloc(if_incoming, if_outgoing,
						    queue_left, bat_priv);
	if (!forw_packet_aggr)
		return;

	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) {
		batadv_forw_packet_free(forw_packet_aggr, true);
		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);
}


Contributors
PersonTokensPropCommitsCommitProp
Marek Lindner17271.97%17.69%


Linus Lüssing2610.88%215.38%


Sven Eckelmann239.62%538.46%


Simon Wunderlich135.44%215.38%


Antonio Quartulli52.09%323.08%


Total239100.00%13100.00%



/* 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;
	}
}


Contributors
PersonTokensPropCommitsCommitProp
Marek Lindner6778.82%125.00%


Sven Eckelmann1821.18%375.00%


Total85100.00%4100.00%



/**
 * 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,