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Antonio Quartulli0b873932013-01-04 03:05:31 +01001/* Copyright (C) 2010-2013 B.A.T.M.A.N. contributors:
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +00002 *
3 * Andreas Langer
4 *
5 * This program is free software; you can redistribute it and/or
6 * modify it under the terms of version 2 of the GNU General Public
7 * License as published by the Free Software Foundation.
8 *
9 * This program is distributed in the hope that it will be useful, but
10 * WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 * General Public License for more details.
13 *
14 * You should have received a copy of the GNU General Public License
15 * along with this program; if not, write to the Free Software
16 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
17 * 02110-1301, USA
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +000018 */
19
20#ifndef _NET_BATMAN_ADV_UNICAST_H_
21#define _NET_BATMAN_ADV_UNICAST_H_
22
Sven Eckelmannae361ce2011-01-25 22:02:31 +000023#include "packet.h"
24
Sven Eckelmann4d5d2db82012-06-03 22:19:15 +020025#define BATADV_FRAG_TIMEOUT 10000 /* purge frag list entries after time in ms */
26#define BATADV_FRAG_BUFFER_SIZE 6 /* number of list elements in buffer */
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +000027
Sven Eckelmann56303d32012-06-05 22:31:31 +020028int batadv_frag_reassemble_skb(struct sk_buff *skb,
29 struct batadv_priv *bat_priv,
Sven Eckelmann88ed1e772012-05-12 02:09:40 +020030 struct sk_buff **new_skb);
31void batadv_frag_list_free(struct list_head *head);
Sven Eckelmann56303d32012-06-05 22:31:31 +020032int batadv_frag_send_skb(struct sk_buff *skb, struct batadv_priv *bat_priv,
33 struct batadv_hard_iface *hard_iface,
Sven Eckelmann88ed1e772012-05-12 02:09:40 +020034 const uint8_t dstaddr[]);
Antonio Quartulli785ea112011-11-23 11:35:44 +010035bool batadv_unicast_4addr_prepare_skb(struct batadv_priv *bat_priv,
36 struct sk_buff *skb,
37 struct batadv_orig_node *orig_node,
38 int packet_subtype);
Antonio Quartulli7cdcf6d2012-10-01 09:57:35 +020039int batadv_unicast_generic_send_skb(struct batadv_priv *bat_priv,
40 struct sk_buff *skb, int packet_type,
41 int packet_subtype);
42
43
44/**
45 * batadv_unicast_send_skb - send the skb encapsulated in a unicast packet
46 * @bat_priv: the bat priv with all the soft interface information
47 * @skb: the payload to send
48 */
49static inline int batadv_unicast_send_skb(struct batadv_priv *bat_priv,
50 struct sk_buff *skb)
51{
52 return batadv_unicast_generic_send_skb(bat_priv, skb, BATADV_UNICAST,
53 0);
54}
55
56/**
57 * batadv_unicast_send_skb - send the skb encapsulated in a unicast4addr packet
58 * @bat_priv: the bat priv with all the soft interface information
59 * @skb: the payload to send
60 * @packet_subtype: the batman 4addr packet subtype to use
61 */
62static inline int batadv_unicast_4addr_send_skb(struct batadv_priv *bat_priv,
63 struct sk_buff *skb,
64 int packet_subtype)
65{
66 return batadv_unicast_generic_send_skb(bat_priv, skb,
67 BATADV_UNICAST_4ADDR,
68 packet_subtype);
69}
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +000070
Sven Eckelmannf0530ee2012-05-12 13:48:57 +020071static inline int batadv_frag_can_reassemble(const struct sk_buff *skb, int mtu)
Sven Eckelmannae361ce2011-01-25 22:02:31 +000072{
Sven Eckelmann96412692012-06-05 22:31:30 +020073 const struct batadv_unicast_frag_packet *unicast_packet;
Sven Eckelmannae361ce2011-01-25 22:02:31 +000074 int uneven_correction = 0;
75 unsigned int merged_size;
76
Sven Eckelmann96412692012-06-05 22:31:30 +020077 unicast_packet = (struct batadv_unicast_frag_packet *)skb->data;
Sven Eckelmannae361ce2011-01-25 22:02:31 +000078
Sven Eckelmannacd34af2012-06-03 22:19:21 +020079 if (unicast_packet->flags & BATADV_UNI_FRAG_LARGETAIL) {
80 if (unicast_packet->flags & BATADV_UNI_FRAG_HEAD)
Sven Eckelmannae361ce2011-01-25 22:02:31 +000081 uneven_correction = 1;
82 else
83 uneven_correction = -1;
84 }
85
Sven Eckelmann704509b2011-05-14 23:14:54 +020086 merged_size = (skb->len - sizeof(*unicast_packet)) * 2;
Sven Eckelmann96412692012-06-05 22:31:30 +020087 merged_size += sizeof(struct batadv_unicast_packet) + uneven_correction;
Sven Eckelmannae361ce2011-01-25 22:02:31 +000088
89 return merged_size <= mtu;
90}
91
Sven Eckelmannc6c8fea2010-12-13 11:19:28 +000092#endif /* _NET_BATMAN_ADV_UNICAST_H_ */