1 /* Copyright (C) 2010-2013 B.A.T.M.A.N. contributors:
2 *
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
18 */
19
20 #ifndef _NET_BATMAN_ADV_UNICAST_H_
21 #define _NET_BATMAN_ADV_UNICAST_H_
22
23 #include "packet.h"
24
25 #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 */
27
28 int batadv_frag_reassemble_skb(struct sk_buff *skb,
29 struct batadv_priv *bat_priv,
30 struct sk_buff **new_skb);
31 void batadv_frag_list_free(struct list_head *head);
32 int batadv_frag_send_skb(struct sk_buff *skb, struct batadv_priv *bat_priv,
33 struct batadv_hard_iface *hard_iface,
34 const uint8_t dstaddr[]);
35 bool 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);
39 int 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 */
batadv_unicast_send_skb(struct batadv_priv * bat_priv,struct sk_buff * skb)49 static 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 */
batadv_unicast_4addr_send_skb(struct batadv_priv * bat_priv,struct sk_buff * skb,int packet_subtype)62 static 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 }
70
batadv_frag_can_reassemble(const struct sk_buff * skb,int mtu)71 static inline int batadv_frag_can_reassemble(const struct sk_buff *skb, int mtu)
72 {
73 const struct batadv_unicast_frag_packet *unicast_packet;
74 int uneven_correction = 0;
75 unsigned int merged_size;
76
77 unicast_packet = (struct batadv_unicast_frag_packet *)skb->data;
78
79 if (unicast_packet->flags & BATADV_UNI_FRAG_LARGETAIL) {
80 if (unicast_packet->flags & BATADV_UNI_FRAG_HEAD)
81 uneven_correction = 1;
82 else
83 uneven_correction = -1;
84 }
85
86 merged_size = (skb->len - sizeof(*unicast_packet)) * 2;
87 merged_size += sizeof(struct batadv_unicast_packet) + uneven_correction;
88
89 return merged_size <= mtu;
90 }
91
92 #endif /* _NET_BATMAN_ADV_UNICAST_H_ */
93