1 /* SPDX-License-Identifier: GPL-2.0 */
2 /* Copyright (C) 2011-2018 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 netlink_callback;
32 struct seq_file;
33 struct sk_buff;
34
35 #ifdef CONFIG_BATMAN_ADV_DAT
36
37 /* BATADV_DAT_ADDR_MAX - maximum address value in the DHT space */
38 #define BATADV_DAT_ADDR_MAX ((batadv_dat_addr_t)~(batadv_dat_addr_t)0)
39
40 void batadv_dat_status_update(struct net_device *net_dev);
41 bool batadv_dat_snoop_outgoing_arp_request(struct batadv_priv *bat_priv,
42 struct sk_buff *skb);
43 bool batadv_dat_snoop_incoming_arp_request(struct batadv_priv *bat_priv,
44 struct sk_buff *skb, int hdr_size);
45 void batadv_dat_snoop_outgoing_arp_reply(struct batadv_priv *bat_priv,
46 struct sk_buff *skb);
47 bool batadv_dat_snoop_incoming_arp_reply(struct batadv_priv *bat_priv,
48 struct sk_buff *skb, int hdr_size);
49 bool batadv_dat_drop_broadcast_packet(struct batadv_priv *bat_priv,
50 struct batadv_forw_packet *forw_packet);
51
52 /**
53 * batadv_dat_init_orig_node_addr() - assign a DAT address to the orig_node
54 * @orig_node: the node to assign the DAT address to
55 */
56 static inline void
57 batadv_dat_init_orig_node_addr(struct batadv_orig_node *orig_node)
58 {
59 u32 addr;
60
61 addr = batadv_choose_orig(orig_node->orig, BATADV_DAT_ADDR_MAX);
62 orig_node->dat_addr = (batadv_dat_addr_t)addr;
63 }
64
65 /**
66 * batadv_dat_init_own_addr() - assign a DAT address to the node itself
67 * @bat_priv: the bat priv with all the soft interface information
68 * @primary_if: a pointer to the primary interface
69 */
70 static inline void
71 batadv_dat_init_own_addr(struct batadv_priv *bat_priv,
72 struct batadv_hard_iface *primary_if)
73 {
74 u32 addr;
75
76 addr = batadv_choose_orig(primary_if->net_dev->dev_addr,
77 BATADV_DAT_ADDR_MAX);
78
79 bat_priv->dat.addr = (batadv_dat_addr_t)addr;
80 }
81
82 int batadv_dat_init(struct batadv_priv *bat_priv);
83 void batadv_dat_free(struct batadv_priv *bat_priv);
84 int batadv_dat_cache_seq_print_text(struct seq_file *seq, void *offset);
85 int batadv_dat_cache_dump(struct sk_buff *msg, struct netlink_callback *cb);
86
87 /**
88 * batadv_dat_inc_counter() - increment the correct DAT packet counter
89 * @bat_priv: the bat priv with all the soft interface information
90 * @subtype: the 4addr subtype of the packet to be counted
91 *
92 * Updates the ethtool statistics for the received packet if it is a DAT subtype
93 */
94 static inline void batadv_dat_inc_counter(struct batadv_priv *bat_priv,
95 u8 subtype)
96 {
97 switch (subtype) {
98 case BATADV_P_DAT_DHT_GET:
99 batadv_inc_counter(bat_priv,
100 BATADV_CNT_DAT_GET_RX);
101 break;
102 case BATADV_P_DAT_DHT_PUT:
103 batadv_inc_counter(bat_priv,
104 BATADV_CNT_DAT_PUT_RX);
105 break;
106 }
107 }
108
109 #else
110
111 static inline void batadv_dat_status_update(struct net_device *net_dev)
112 {
113 }
114
115 static inline bool
116 batadv_dat_snoop_outgoing_arp_request(struct batadv_priv *bat_priv,
117 struct sk_buff *skb)
118 {
119 return false;
120 }
121
122 static inline bool
123 batadv_dat_snoop_incoming_arp_request(struct batadv_priv *bat_priv,
124 struct sk_buff *skb, int hdr_size)
125 {
126 return false;
127 }
128
129 static inline bool
130 batadv_dat_snoop_outgoing_arp_reply(struct batadv_priv *bat_priv,
131 struct sk_buff *skb)
132 {
133 return false;
134 }
135
136 static inline bool
137 batadv_dat_snoop_incoming_arp_reply(struct batadv_priv *bat_priv,
138 struct sk_buff *skb, int hdr_size)
139 {
140 return false;
141 }
142
143 static inline bool
144 batadv_dat_drop_broadcast_packet(struct batadv_priv *bat_priv,
145 struct batadv_forw_packet *forw_packet)
146 {
147 return false;
148 }
149
150 static inline void
151 batadv_dat_init_orig_node_addr(struct batadv_orig_node *orig_node)
152 {
153 }
154
155 static inline void batadv_dat_init_own_addr(struct batadv_priv *bat_priv,
156 struct batadv_hard_iface *iface)
157 {
158 }
159
160 static inline void batadv_arp_change_timeout(struct net_device *soft_iface,
161 const char *name)
162 {
163 }
164
165 static inline int batadv_dat_init(struct batadv_priv *bat_priv)
166 {
167 return 0;
168 }
169
170 static inline void batadv_dat_free(struct batadv_priv *bat_priv)
171 {
172 }
173
174 static inline int
175 batadv_dat_cache_dump(struct sk_buff *msg, struct netlink_callback *cb)
176 {
177 return -EOPNOTSUPP;
178 }
179
180 static inline void batadv_dat_inc_counter(struct batadv_priv *bat_priv,
181 u8 subtype)
182 {
183 }
184
185 #endif /* CONFIG_BATMAN_ADV_DAT */
186
187 #endif /* _NET_BATMAN_ADV_DISTRIBUTED_ARP_TABLE_H_ */
188
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