7cdcf6dddc
The current unicast packet type does not contain the orig source address. This patches add a new unicast packet (called UNICAST_4ADDR) which provides two new fields: the originator source address and the subtype (the type of the data contained in the packet payload). The former is useful to identify the node which injected the packet into the network and the latter is useful to avoid creating new unicast packet types in the future: a macro defining a new subtype will be enough. Signed-off-by: Antonio Quartulli <ordex@autistici.org>
88 lines
2.9 KiB
C
88 lines
2.9 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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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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