unicast.h
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/* Copyright (C) 2010-2013 B.A.T.M.A.N. contributors:
*
* Andreas Langer
*
* 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, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
* 02110-1301, USA
*/
#ifndef _NET_BATMAN_ADV_UNICAST_H_
#define _NET_BATMAN_ADV_UNICAST_H_
#include "packet.h"
#define BATADV_FRAG_TIMEOUT 10000 /* purge frag list entries after time in ms */
#define BATADV_FRAG_BUFFER_SIZE 6 /* number of list elements in buffer */
int batadv_frag_reassemble_skb(struct sk_buff *skb,
struct batadv_priv *bat_priv,
struct sk_buff **new_skb);
void batadv_frag_list_free(struct list_head *head);
int batadv_frag_send_skb(struct sk_buff *skb, struct batadv_priv *bat_priv,
struct batadv_hard_iface *hard_iface,
const uint8_t dstaddr[]);
bool batadv_unicast_4addr_prepare_skb(struct batadv_priv *bat_priv,
struct sk_buff *skb,
struct batadv_orig_node *orig_node,
int packet_subtype);
int batadv_unicast_generic_send_skb(struct batadv_priv *bat_priv,
struct sk_buff *skb, int packet_type,
int packet_subtype);
/**
* batadv_unicast_send_skb - send the skb encapsulated in a unicast packet
* @bat_priv: the bat priv with all the soft interface information
* @skb: the payload to send
*/
static inline int batadv_unicast_send_skb(struct batadv_priv *bat_priv,
struct sk_buff *skb)
{
return batadv_unicast_generic_send_skb(bat_priv, skb, BATADV_UNICAST,
0);
}
/**
* batadv_unicast_send_skb - send the skb encapsulated in a unicast4addr packet
* @bat_priv: the bat priv with all the soft interface information
* @skb: the payload to send
* @packet_subtype: the batman 4addr packet subtype to use
*/
static inline int batadv_unicast_4addr_send_skb(struct batadv_priv *bat_priv,
struct sk_buff *skb,
int packet_subtype)
{
return batadv_unicast_generic_send_skb(bat_priv, skb,
BATADV_UNICAST_4ADDR,
packet_subtype);
}
static inline int batadv_frag_can_reassemble(const struct sk_buff *skb, int mtu)
{
const struct batadv_unicast_frag_packet *unicast_packet;
int uneven_correction = 0;
unsigned int merged_size;
unicast_packet = (struct batadv_unicast_frag_packet *)skb->data;
if (unicast_packet->flags & BATADV_UNI_FRAG_LARGETAIL) {
if (unicast_packet->flags & BATADV_UNI_FRAG_HEAD)
uneven_correction = 1;
else
uneven_correction = -1;
}
merged_size = (skb->len - sizeof(*unicast_packet)) * 2;
merged_size += sizeof(struct batadv_unicast_packet) + uneven_correction;
return merged_size <= mtu;
}
#endif /* _NET_BATMAN_ADV_UNICAST_H_ */