1 /* Copyright (C) 2011-2017  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 #include "main.h"
22 
23 #include <linux/compiler.h>
24 #include <linux/netdevice.h>
25 #include <linux/types.h>
26 
27 #include "originator.h"
28 #include "packet.h"
29 
30 struct seq_file;
31 struct sk_buff;
32 
33 #ifdef CONFIG_BATMAN_ADV_DAT
34 
35 /* BATADV_DAT_ADDR_MAX - maximum address value in the DHT space */
36 #define BATADV_DAT_ADDR_MAX ((batadv_dat_addr_t)~(batadv_dat_addr_t)0)
37 
38 void batadv_dat_status_update(struct net_device *net_dev);
39 bool batadv_dat_snoop_outgoing_arp_request(struct batadv_priv *bat_priv,
40 					   struct sk_buff *skb);
41 bool batadv_dat_snoop_incoming_arp_request(struct batadv_priv *bat_priv,
42 					   struct sk_buff *skb, int hdr_size);
43 void batadv_dat_snoop_outgoing_arp_reply(struct batadv_priv *bat_priv,
44 					 struct sk_buff *skb);
45 bool batadv_dat_snoop_incoming_arp_reply(struct batadv_priv *bat_priv,
46 					 struct sk_buff *skb, int hdr_size);
47 bool batadv_dat_drop_broadcast_packet(struct batadv_priv *bat_priv,
48 				      struct batadv_forw_packet *forw_packet);
49 
50 /**
51  * batadv_dat_init_orig_node_addr - assign a DAT address to the orig_node
52  * @orig_node: the node to assign the DAT address to
53  */
54 static inline void
55 batadv_dat_init_orig_node_addr(struct batadv_orig_node *orig_node)
56 {
57 	u32 addr;
58 
59 	addr = batadv_choose_orig(orig_node->orig, BATADV_DAT_ADDR_MAX);
60 	orig_node->dat_addr = (batadv_dat_addr_t)addr;
61 }
62 
63 /**
64  * batadv_dat_init_own_addr - assign a DAT address to the node itself
65  * @bat_priv: the bat priv with all the soft interface information
66  * @primary_if: a pointer to the primary interface
67  */
68 static inline void
69 batadv_dat_init_own_addr(struct batadv_priv *bat_priv,
70 			 struct batadv_hard_iface *primary_if)
71 {
72 	u32 addr;
73 
74 	addr = batadv_choose_orig(primary_if->net_dev->dev_addr,
75 				  BATADV_DAT_ADDR_MAX);
76 
77 	bat_priv->dat.addr = (batadv_dat_addr_t)addr;
78 }
79 
80 int batadv_dat_init(struct batadv_priv *bat_priv);
81 void batadv_dat_free(struct batadv_priv *bat_priv);
82 int batadv_dat_cache_seq_print_text(struct seq_file *seq, void *offset);
83 
84 /**
85  * batadv_dat_inc_counter - increment the correct DAT packet counter
86  * @bat_priv: the bat priv with all the soft interface information
87  * @subtype: the 4addr subtype of the packet to be counted
88  *
89  * Updates the ethtool statistics for the received packet if it is a DAT subtype
90  */
91 static inline void batadv_dat_inc_counter(struct batadv_priv *bat_priv,
92 					  u8 subtype)
93 {
94 	switch (subtype) {
95 	case BATADV_P_DAT_DHT_GET:
96 		batadv_inc_counter(bat_priv,
97 				   BATADV_CNT_DAT_GET_RX);
98 		break;
99 	case BATADV_P_DAT_DHT_PUT:
100 		batadv_inc_counter(bat_priv,
101 				   BATADV_CNT_DAT_PUT_RX);
102 		break;
103 	}
104 }
105 
106 #else
107 
108 static inline void batadv_dat_status_update(struct net_device *net_dev)
109 {
110 }
111 
112 static inline bool
113 batadv_dat_snoop_outgoing_arp_request(struct batadv_priv *bat_priv,
114 				      struct sk_buff *skb)
115 {
116 	return false;
117 }
118 
119 static inline bool
120 batadv_dat_snoop_incoming_arp_request(struct batadv_priv *bat_priv,
121 				      struct sk_buff *skb, int hdr_size)
122 {
123 	return false;
124 }
125 
126 static inline bool
127 batadv_dat_snoop_outgoing_arp_reply(struct batadv_priv *bat_priv,
128 				    struct sk_buff *skb)
129 {
130 	return false;
131 }
132 
133 static inline bool
134 batadv_dat_snoop_incoming_arp_reply(struct batadv_priv *bat_priv,
135 				    struct sk_buff *skb, int hdr_size)
136 {
137 	return false;
138 }
139 
140 static inline bool
141 batadv_dat_drop_broadcast_packet(struct batadv_priv *bat_priv,
142 				 struct batadv_forw_packet *forw_packet)
143 {
144 	return false;
145 }
146 
147 static inline void
148 batadv_dat_init_orig_node_addr(struct batadv_orig_node *orig_node)
149 {
150 }
151 
152 static inline void batadv_dat_init_own_addr(struct batadv_priv *bat_priv,
153 					    struct batadv_hard_iface *iface)
154 {
155 }
156 
157 static inline void batadv_arp_change_timeout(struct net_device *soft_iface,
158 					     const char *name)
159 {
160 }
161 
162 static inline int batadv_dat_init(struct batadv_priv *bat_priv)
163 {
164 	return 0;
165 }
166 
167 static inline void batadv_dat_free(struct batadv_priv *bat_priv)
168 {
169 }
170 
171 static inline void batadv_dat_inc_counter(struct batadv_priv *bat_priv,
172 					  u8 subtype)
173 {
174 }
175 
176 #endif /* CONFIG_BATMAN_ADV_DAT */
177 
178 #endif /* _NET_BATMAN_ADV_DISTRIBUTED_ARP_TABLE_H_ */
179