1 /*
2 * Copyright (C) 2010-2012 B.A.T.M.A.N. contributors:
3 *
4 * Andreas Langer
5 *
6 * This program is free software; you can redistribute it and/or
7 * modify it under the terms of version 2 of the GNU General Public
8 * License as published by the Free Software Foundation.
9 *
10 * This program is distributed in the hope that it will be useful, but
11 * WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 * General Public License for more details.
14 *
15 * You should have received a copy of the GNU General Public License
16 * along with this program; if not, write to the Free Software
17 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
18 * 02110-1301, USA
19 *
20 */
21
22 #ifndef _NET_BATMAN_ADV_UNICAST_H_
23 #define _NET_BATMAN_ADV_UNICAST_H_
24
25 #include "packet.h"
26
27 #define FRAG_TIMEOUT 10000 /* purge frag list entries after time in ms */
28 #define FRAG_BUFFER_SIZE 6 /* number of list elements in buffer */
29
30 int frag_reassemble_skb(struct sk_buff *skb, struct bat_priv *bat_priv,
31 struct sk_buff **new_skb);
32 void frag_list_free(struct list_head *head);
33 int unicast_send_skb(struct sk_buff *skb, struct bat_priv *bat_priv);
34 int frag_send_skb(struct sk_buff *skb, struct bat_priv *bat_priv,
35 struct hard_iface *hard_iface, const uint8_t dstaddr[]);
36
frag_can_reassemble(const struct sk_buff * skb,int mtu)37 static inline int frag_can_reassemble(const struct sk_buff *skb, int mtu)
38 {
39 const struct unicast_frag_packet *unicast_packet;
40 int uneven_correction = 0;
41 unsigned int merged_size;
42
43 unicast_packet = (struct unicast_frag_packet *)skb->data;
44
45 if (unicast_packet->flags & UNI_FRAG_LARGETAIL) {
46 if (unicast_packet->flags & UNI_FRAG_HEAD)
47 uneven_correction = 1;
48 else
49 uneven_correction = -1;
50 }
51
52 merged_size = (skb->len - sizeof(*unicast_packet)) * 2;
53 merged_size += sizeof(struct unicast_packet) + uneven_correction;
54
55 return merged_size <= mtu;
56 }
57
58 #endif /* _NET_BATMAN_ADV_UNICAST_H_ */
59