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 /* BATADV_DAT_ADDR_MAX - maximum address value in the DHT space */
29 #define BATADV_DAT_ADDR_MAX ((batadv_dat_addr_t)~(batadv_dat_addr_t)0)
30 
31 void batadv_dat_status_update(struct net_device *net_dev);
32 bool batadv_dat_snoop_outgoing_arp_request(struct batadv_priv *bat_priv,
33 					   struct sk_buff *skb);
34 bool batadv_dat_snoop_incoming_arp_request(struct batadv_priv *bat_priv,
35 					   struct sk_buff *skb, int hdr_size);
36 void batadv_dat_snoop_outgoing_arp_reply(struct batadv_priv *bat_priv,
37 					 struct sk_buff *skb);
38 bool batadv_dat_snoop_incoming_arp_reply(struct batadv_priv *bat_priv,
39 					 struct sk_buff *skb, int hdr_size);
40 bool batadv_dat_drop_broadcast_packet(struct batadv_priv *bat_priv,
41 				      struct batadv_forw_packet *forw_packet);
42 
43 /**
44  * batadv_dat_init_orig_node_addr - assign a DAT address to the orig_node
45  * @orig_node: the node to assign the DAT address to
46  */
47 static inline void
48 batadv_dat_init_orig_node_addr(struct batadv_orig_node *orig_node)
49 {
50 	uint32_t addr;
51 
52 	addr = batadv_choose_orig(orig_node->orig, BATADV_DAT_ADDR_MAX);
53 	orig_node->dat_addr = (batadv_dat_addr_t)addr;
54 }
55 
56 /**
57  * batadv_dat_init_own_addr - assign a DAT address to the node itself
58  * @bat_priv: the bat priv with all the soft interface information
59  * @primary_if: a pointer to the primary interface
60  */
61 static inline void
62 batadv_dat_init_own_addr(struct batadv_priv *bat_priv,
63 			 struct batadv_hard_iface *primary_if)
64 {
65 	uint32_t addr;
66 
67 	addr = batadv_choose_orig(primary_if->net_dev->dev_addr,
68 				  BATADV_DAT_ADDR_MAX);
69 
70 	bat_priv->dat.addr = (batadv_dat_addr_t)addr;
71 }
72 
73 int batadv_dat_init(struct batadv_priv *bat_priv);
74 void batadv_dat_free(struct batadv_priv *bat_priv);
75 int batadv_dat_cache_seq_print_text(struct seq_file *seq, void *offset);
76 
77 /**
78  * batadv_dat_inc_counter - increment the correct DAT packet counter
79  * @bat_priv: the bat priv with all the soft interface information
80  * @subtype: the 4addr subtype of the packet to be counted
81  *
82  * Updates the ethtool statistics for the received packet if it is a DAT subtype
83  */
84 static inline void batadv_dat_inc_counter(struct batadv_priv *bat_priv,
85 					  uint8_t subtype)
86 {
87 	switch (subtype) {
88 	case BATADV_P_DAT_DHT_GET:
89 		batadv_inc_counter(bat_priv,
90 				   BATADV_CNT_DAT_GET_RX);
91 		break;
92 	case BATADV_P_DAT_DHT_PUT:
93 		batadv_inc_counter(bat_priv,
94 				   BATADV_CNT_DAT_PUT_RX);
95 		break;
96 	}
97 }
98 
99 #else
100 
101 static inline void batadv_dat_status_update(struct net_device *net_dev)
102 {
103 }
104 
105 static inline bool
106 batadv_dat_snoop_outgoing_arp_request(struct batadv_priv *bat_priv,
107 				      struct sk_buff *skb)
108 {
109 	return false;
110 }
111 
112 static inline bool
113 batadv_dat_snoop_incoming_arp_request(struct batadv_priv *bat_priv,
114 				      struct sk_buff *skb, int hdr_size)
115 {
116 	return false;
117 }
118 
119 static inline bool
120 batadv_dat_snoop_outgoing_arp_reply(struct batadv_priv *bat_priv,
121 				    struct sk_buff *skb)
122 {
123 	return false;
124 }
125 
126 static inline bool
127 batadv_dat_snoop_incoming_arp_reply(struct batadv_priv *bat_priv,
128 				    struct sk_buff *skb, int hdr_size)
129 {
130 	return false;
131 }
132 
133 static inline bool
134 batadv_dat_drop_broadcast_packet(struct batadv_priv *bat_priv,
135 				 struct batadv_forw_packet *forw_packet)
136 {
137 	return false;
138 }
139 
140 static inline void
141 batadv_dat_init_orig_node_addr(struct batadv_orig_node *orig_node)
142 {
143 }
144 
145 static inline void batadv_dat_init_own_addr(struct batadv_priv *bat_priv,
146 					    struct batadv_hard_iface *iface)
147 {
148 }
149 
150 static inline void batadv_arp_change_timeout(struct net_device *soft_iface,
151 					     const char *name)
152 {
153 }
154 
155 static inline int batadv_dat_init(struct batadv_priv *bat_priv)
156 {
157 	return 0;
158 }
159 
160 static inline void batadv_dat_free(struct batadv_priv *bat_priv)
161 {
162 }
163 
164 static inline void batadv_dat_inc_counter(struct batadv_priv *bat_priv,
165 					  uint8_t subtype)
166 {
167 }
168 
169 #endif /* CONFIG_BATMAN_ADV_DAT */
170 
171 #endif /* _NET_BATMAN_ADV_DISTRIBUTED_ARP_TABLE_H_ */
172