batman-adv: filter ARP packets with invalid MAC addresses in DAT
[~shefty/rdma-dev.git] / net / batman-adv / unicast.h
1 /* Copyright (C) 2010-2012 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  */
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  */
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
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_ */