1 /* SPDX-License-Identifier: GPL-2.0 */
2 /* Copyright (C) 2011-2017  B.A.T.M.A.N. contributors:
3  *
4  * Antonio Quartulli
5  *
6  * This program is free software; you can redistribute it and/or
7  * modify it under the terms of version 2 of the GNU General Public
8  * License as published by the Free Software Foundation.
9  *
10  * This program is distributed in the hope that it will be useful, but
11  * WITHOUT ANY WARRANTY; without even the implied warranty of
12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13  * General Public License for more details.
14  *
15  * You should have received a copy of the GNU General Public License
16  * along with this program; if not, see <http://www.gnu.org/licenses/>.
17  */
18 
19 #ifndef _NET_BATMAN_ADV_DISTRIBUTED_ARP_TABLE_H_
20 #define _NET_BATMAN_ADV_DISTRIBUTED_ARP_TABLE_H_
21 
22 #include "main.h"
23 
24 #include <linux/compiler.h>
25 #include <linux/netdevice.h>
26 #include <linux/types.h>
27 #include <uapi/linux/batadv_packet.h>
28 
29 #include "originator.h"
30 
31 struct seq_file;
32 struct sk_buff;
33 
34 #ifdef CONFIG_BATMAN_ADV_DAT
35 
36 /* BATADV_DAT_ADDR_MAX - maximum address value in the DHT space */
37 #define BATADV_DAT_ADDR_MAX ((batadv_dat_addr_t)~(batadv_dat_addr_t)0)
38 
39 void batadv_dat_status_update(struct net_device *net_dev);
40 bool batadv_dat_snoop_outgoing_arp_request(struct batadv_priv *bat_priv,
41 					   struct sk_buff *skb);
42 bool batadv_dat_snoop_incoming_arp_request(struct batadv_priv *bat_priv,
43 					   struct sk_buff *skb, int hdr_size);
44 void batadv_dat_snoop_outgoing_arp_reply(struct batadv_priv *bat_priv,
45 					 struct sk_buff *skb);
46 bool batadv_dat_snoop_incoming_arp_reply(struct batadv_priv *bat_priv,
47 					 struct sk_buff *skb, int hdr_size);
48 bool batadv_dat_drop_broadcast_packet(struct batadv_priv *bat_priv,
49 				      struct batadv_forw_packet *forw_packet);
50 
51 /**
52  * batadv_dat_init_orig_node_addr() - assign a DAT address to the orig_node
53  * @orig_node: the node to assign the DAT address to
54  */
55 static inline void
56 batadv_dat_init_orig_node_addr(struct batadv_orig_node *orig_node)
57 {
58 	u32 addr;
59 
60 	addr = batadv_choose_orig(orig_node->orig, BATADV_DAT_ADDR_MAX);
61 	orig_node->dat_addr = (batadv_dat_addr_t)addr;
62 }
63 
64 /**
65  * batadv_dat_init_own_addr() - assign a DAT address to the node itself
66  * @bat_priv: the bat priv with all the soft interface information
67  * @primary_if: a pointer to the primary interface
68  */
69 static inline void
70 batadv_dat_init_own_addr(struct batadv_priv *bat_priv,
71 			 struct batadv_hard_iface *primary_if)
72 {
73 	u32 addr;
74 
75 	addr = batadv_choose_orig(primary_if->net_dev->dev_addr,
76 				  BATADV_DAT_ADDR_MAX);
77 
78 	bat_priv->dat.addr = (batadv_dat_addr_t)addr;
79 }
80 
81 int batadv_dat_init(struct batadv_priv *bat_priv);
82 void batadv_dat_free(struct batadv_priv *bat_priv);
83 int batadv_dat_cache_seq_print_text(struct seq_file *seq, void *offset);
84 
85 /**
86  * batadv_dat_inc_counter() - increment the correct DAT packet counter
87  * @bat_priv: the bat priv with all the soft interface information
88  * @subtype: the 4addr subtype of the packet to be counted
89  *
90  * Updates the ethtool statistics for the received packet if it is a DAT subtype
91  */
92 static inline void batadv_dat_inc_counter(struct batadv_priv *bat_priv,
93 					  u8 subtype)
94 {
95 	switch (subtype) {
96 	case BATADV_P_DAT_DHT_GET:
97 		batadv_inc_counter(bat_priv,
98 				   BATADV_CNT_DAT_GET_RX);
99 		break;
100 	case BATADV_P_DAT_DHT_PUT:
101 		batadv_inc_counter(bat_priv,
102 				   BATADV_CNT_DAT_PUT_RX);
103 		break;
104 	}
105 }
106 
107 #else
108 
109 static inline void batadv_dat_status_update(struct net_device *net_dev)
110 {
111 }
112 
113 static inline bool
114 batadv_dat_snoop_outgoing_arp_request(struct batadv_priv *bat_priv,
115 				      struct sk_buff *skb)
116 {
117 	return false;
118 }
119 
120 static inline bool
121 batadv_dat_snoop_incoming_arp_request(struct batadv_priv *bat_priv,
122 				      struct sk_buff *skb, int hdr_size)
123 {
124 	return false;
125 }
126 
127 static inline bool
128 batadv_dat_snoop_outgoing_arp_reply(struct batadv_priv *bat_priv,
129 				    struct sk_buff *skb)
130 {
131 	return false;
132 }
133 
134 static inline bool
135 batadv_dat_snoop_incoming_arp_reply(struct batadv_priv *bat_priv,
136 				    struct sk_buff *skb, int hdr_size)
137 {
138 	return false;
139 }
140 
141 static inline bool
142 batadv_dat_drop_broadcast_packet(struct batadv_priv *bat_priv,
143 				 struct batadv_forw_packet *forw_packet)
144 {
145 	return false;
146 }
147 
148 static inline void
149 batadv_dat_init_orig_node_addr(struct batadv_orig_node *orig_node)
150 {
151 }
152 
153 static inline void batadv_dat_init_own_addr(struct batadv_priv *bat_priv,
154 					    struct batadv_hard_iface *iface)
155 {
156 }
157 
158 static inline void batadv_arp_change_timeout(struct net_device *soft_iface,
159 					     const char *name)
160 {
161 }
162 
163 static inline int batadv_dat_init(struct batadv_priv *bat_priv)
164 {
165 	return 0;
166 }
167 
168 static inline void batadv_dat_free(struct batadv_priv *bat_priv)
169 {
170 }
171 
172 static inline void batadv_dat_inc_counter(struct batadv_priv *bat_priv,
173 					  u8 subtype)
174 {
175 }
176 
177 #endif /* CONFIG_BATMAN_ADV_DAT */
178 
179 #endif /* _NET_BATMAN_ADV_DISTRIBUTED_ARP_TABLE_H_ */
180