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785ea11441
Add all the relevant functions in order to manage a Distributed Hash Table over the B.A.T.M.A.N.-adv network. It will later be used to store several ARP entries and implement DAT (Distributed ARP Table) Signed-off-by: Antonio Quartulli <ordex@autistici.org>
93 lines
3.1 KiB
C
93 lines
3.1 KiB
C
/* Copyright (C) 2010-2012 B.A.T.M.A.N. contributors:
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*
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* Andreas Langer
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of version 2 of the GNU General Public
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* License as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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* 02110-1301, USA
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*/
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#ifndef _NET_BATMAN_ADV_UNICAST_H_
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#define _NET_BATMAN_ADV_UNICAST_H_
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#include "packet.h"
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#define BATADV_FRAG_TIMEOUT 10000 /* purge frag list entries after time in ms */
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#define BATADV_FRAG_BUFFER_SIZE 6 /* number of list elements in buffer */
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int batadv_frag_reassemble_skb(struct sk_buff *skb,
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struct batadv_priv *bat_priv,
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struct sk_buff **new_skb);
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void batadv_frag_list_free(struct list_head *head);
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int batadv_frag_send_skb(struct sk_buff *skb, struct batadv_priv *bat_priv,
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struct batadv_hard_iface *hard_iface,
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const uint8_t dstaddr[]);
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bool batadv_unicast_4addr_prepare_skb(struct batadv_priv *bat_priv,
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struct sk_buff *skb,
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struct batadv_orig_node *orig_node,
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int packet_subtype);
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int batadv_unicast_generic_send_skb(struct batadv_priv *bat_priv,
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struct sk_buff *skb, int packet_type,
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int packet_subtype);
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/**
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* batadv_unicast_send_skb - send the skb encapsulated in a unicast packet
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* @bat_priv: the bat priv with all the soft interface information
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* @skb: the payload to send
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*/
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static inline int batadv_unicast_send_skb(struct batadv_priv *bat_priv,
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struct sk_buff *skb)
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{
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return batadv_unicast_generic_send_skb(bat_priv, skb, BATADV_UNICAST,
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0);
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}
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/**
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* batadv_unicast_send_skb - send the skb encapsulated in a unicast4addr packet
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* @bat_priv: the bat priv with all the soft interface information
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* @skb: the payload to send
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* @packet_subtype: the batman 4addr packet subtype to use
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*/
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static inline int batadv_unicast_4addr_send_skb(struct batadv_priv *bat_priv,
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struct sk_buff *skb,
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int packet_subtype)
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{
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return batadv_unicast_generic_send_skb(bat_priv, skb,
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BATADV_UNICAST_4ADDR,
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packet_subtype);
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}
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static inline int batadv_frag_can_reassemble(const struct sk_buff *skb, int mtu)
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{
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const struct batadv_unicast_frag_packet *unicast_packet;
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int uneven_correction = 0;
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unsigned int merged_size;
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unicast_packet = (struct batadv_unicast_frag_packet *)skb->data;
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if (unicast_packet->flags & BATADV_UNI_FRAG_LARGETAIL) {
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if (unicast_packet->flags & BATADV_UNI_FRAG_HEAD)
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uneven_correction = 1;
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else
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uneven_correction = -1;
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}
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merged_size = (skb->len - sizeof(*unicast_packet)) * 2;
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merged_size += sizeof(struct batadv_unicast_packet) + uneven_correction;
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return merged_size <= mtu;
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}
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#endif /* _NET_BATMAN_ADV_UNICAST_H_ */
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