1 /* Copyright (C) 2011-2014 B.A.T.M.A.N. contributors:
2  *
3  * Antonio Quartulli
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, see <http://www.gnu.org/licenses/>.
16  */
17 
18 #ifndef _NET_BATMAN_ADV_DISTRIBUTED_ARP_TABLE_H_
19 #define _NET_BATMAN_ADV_DISTRIBUTED_ARP_TABLE_H_
20 
21 #ifdef CONFIG_BATMAN_ADV_DAT
22 
23 #include "types.h"
24 #include "originator.h"
25 
26 #include <linux/if_arp.h>
27 
28 #define BATADV_DAT_ADDR_MAX ((batadv_dat_addr_t)~(batadv_dat_addr_t)0)
29 
30 void batadv_dat_status_update(struct net_device *net_dev);
31 bool batadv_dat_snoop_outgoing_arp_request(struct batadv_priv *bat_priv,
32 					   struct sk_buff *skb);
33 bool batadv_dat_snoop_incoming_arp_request(struct batadv_priv *bat_priv,
34 					   struct sk_buff *skb, int hdr_size);
35 void batadv_dat_snoop_outgoing_arp_reply(struct batadv_priv *bat_priv,
36 					 struct sk_buff *skb);
37 bool batadv_dat_snoop_incoming_arp_reply(struct batadv_priv *bat_priv,
38 					 struct sk_buff *skb, int hdr_size);
39 bool batadv_dat_drop_broadcast_packet(struct batadv_priv *bat_priv,
40 				      struct batadv_forw_packet *forw_packet);
41 
42 /**
43  * batadv_dat_init_orig_node_addr - assign a DAT address to the orig_node
44  * @orig_node: the node to assign the DAT address to
45  */
46 static inline void
47 batadv_dat_init_orig_node_addr(struct batadv_orig_node *orig_node)
48 {
49 	uint32_t addr;
50 
51 	addr = batadv_choose_orig(orig_node->orig, BATADV_DAT_ADDR_MAX);
52 	orig_node->dat_addr = (batadv_dat_addr_t)addr;
53 }
54 
55 /**
56  * batadv_dat_init_own_addr - assign a DAT address to the node itself
57  * @bat_priv: the bat priv with all the soft interface information
58  * @primary_if: a pointer to the primary interface
59  */
60 static inline void
61 batadv_dat_init_own_addr(struct batadv_priv *bat_priv,
62 			 struct batadv_hard_iface *primary_if)
63 {
64 	uint32_t addr;
65 
66 	addr = batadv_choose_orig(primary_if->net_dev->dev_addr,
67 				  BATADV_DAT_ADDR_MAX);
68 
69 	bat_priv->dat.addr = (batadv_dat_addr_t)addr;
70 }
71 
72 int batadv_dat_init(struct batadv_priv *bat_priv);
73 void batadv_dat_free(struct batadv_priv *bat_priv);
74 int batadv_dat_cache_seq_print_text(struct seq_file *seq, void *offset);
75 
76 /**
77  * batadv_dat_inc_counter - increment the correct DAT packet counter
78  * @bat_priv: the bat priv with all the soft interface information
79  * @subtype: the 4addr subtype of the packet to be counted
80  *
81  * Updates the ethtool statistics for the received packet if it is a DAT subtype
82  */
83 static inline void batadv_dat_inc_counter(struct batadv_priv *bat_priv,
84 					  uint8_t subtype)
85 {
86 	switch (subtype) {
87 	case BATADV_P_DAT_DHT_GET:
88 		batadv_inc_counter(bat_priv,
89 				   BATADV_CNT_DAT_GET_RX);
90 		break;
91 	case BATADV_P_DAT_DHT_PUT:
92 		batadv_inc_counter(bat_priv,
93 				   BATADV_CNT_DAT_PUT_RX);
94 		break;
95 	}
96 }
97 
98 #else
99 
100 static inline void batadv_dat_status_update(struct net_device *net_dev)
101 {
102 }
103 
104 static inline bool
105 batadv_dat_snoop_outgoing_arp_request(struct batadv_priv *bat_priv,
106 				      struct sk_buff *skb)
107 {
108 	return false;
109 }
110 
111 static inline bool
112 batadv_dat_snoop_incoming_arp_request(struct batadv_priv *bat_priv,
113 				      struct sk_buff *skb, int hdr_size)
114 {
115 	return false;
116 }
117 
118 static inline bool
119 batadv_dat_snoop_outgoing_arp_reply(struct batadv_priv *bat_priv,
120 				    struct sk_buff *skb)
121 {
122 	return false;
123 }
124 
125 static inline bool
126 batadv_dat_snoop_incoming_arp_reply(struct batadv_priv *bat_priv,
127 				    struct sk_buff *skb, int hdr_size)
128 {
129 	return false;
130 }
131 
132 static inline bool
133 batadv_dat_drop_broadcast_packet(struct batadv_priv *bat_priv,
134 				 struct batadv_forw_packet *forw_packet)
135 {
136 	return false;
137 }
138 
139 static inline void
140 batadv_dat_init_orig_node_addr(struct batadv_orig_node *orig_node)
141 {
142 }
143 
144 static inline void batadv_dat_init_own_addr(struct batadv_priv *bat_priv,
145 					    struct batadv_hard_iface *iface)
146 {
147 }
148 
149 static inline void batadv_arp_change_timeout(struct net_device *soft_iface,
150 					     const char *name)
151 {
152 }
153 
154 static inline int batadv_dat_init(struct batadv_priv *bat_priv)
155 {
156 	return 0;
157 }
158 
159 static inline void batadv_dat_free(struct batadv_priv *bat_priv)
160 {
161 }
162 
163 static inline void batadv_dat_inc_counter(struct batadv_priv *bat_priv,
164 					  uint8_t subtype)
165 {
166 }
167 
168 #endif /* CONFIG_BATMAN_ADV_DAT */
169 
170 #endif /* _NET_BATMAN_ADV_DISTRIBUTED_ARP_TABLE_H_ */
171