1/* SPDX-License-Identifier: GPL-2.0 */
2/* Copyright (C) B.A.T.M.A.N. contributors:
3 *
4 * Antonio Quartulli
5 */
6
7#ifndef _NET_BATMAN_ADV_DISTRIBUTED_ARP_TABLE_H_
8#define _NET_BATMAN_ADV_DISTRIBUTED_ARP_TABLE_H_
9
10#include "main.h"
11
12#include <linux/compiler.h>
13#include <linux/netdevice.h>
14#include <linux/netlink.h>
15#include <linux/skbuff.h>
16#include <linux/types.h>
17#include <uapi/linux/batadv_packet.h>
18
19#include "originator.h"
20
21#ifdef CONFIG_BATMAN_ADV_DAT
22
23/* BATADV_DAT_ADDR_MAX - maximum address value in the DHT space */
24#define BATADV_DAT_ADDR_MAX ((batadv_dat_addr_t)~(batadv_dat_addr_t)0)
25
26void batadv_dat_status_update(struct net_device *net_dev);
27bool batadv_dat_snoop_outgoing_arp_request(struct batadv_priv *bat_priv,
28					   struct sk_buff *skb);
29bool batadv_dat_snoop_incoming_arp_request(struct batadv_priv *bat_priv,
30					   struct sk_buff *skb, int hdr_size);
31void batadv_dat_snoop_outgoing_arp_reply(struct batadv_priv *bat_priv,
32					 struct sk_buff *skb);
33bool batadv_dat_snoop_incoming_arp_reply(struct batadv_priv *bat_priv,
34					 struct sk_buff *skb, int hdr_size);
35void batadv_dat_snoop_outgoing_dhcp_ack(struct batadv_priv *bat_priv,
36					struct sk_buff *skb,
37					__be16 proto,
38					unsigned short vid);
39void batadv_dat_snoop_incoming_dhcp_ack(struct batadv_priv *bat_priv,
40					struct sk_buff *skb, int hdr_size);
41bool batadv_dat_drop_broadcast_packet(struct batadv_priv *bat_priv,
42				      struct batadv_forw_packet *forw_packet);
43
44/**
45 * batadv_dat_init_orig_node_addr() - assign a DAT address to the orig_node
46 * @orig_node: the node to assign the DAT address to
47 */
48static inline void
49batadv_dat_init_orig_node_addr(struct batadv_orig_node *orig_node)
50{
51	u32 addr;
52
53	addr = batadv_choose_orig(orig_node->orig, BATADV_DAT_ADDR_MAX);
54	orig_node->dat_addr = (batadv_dat_addr_t)addr;
55}
56
57/**
58 * batadv_dat_init_own_addr() - assign a DAT address to the node itself
59 * @bat_priv: the bat priv with all the soft interface information
60 * @primary_if: a pointer to the primary interface
61 */
62static inline void
63batadv_dat_init_own_addr(struct batadv_priv *bat_priv,
64			 struct batadv_hard_iface *primary_if)
65{
66	u32 addr;
67
68	addr = batadv_choose_orig(primary_if->net_dev->dev_addr,
69				  BATADV_DAT_ADDR_MAX);
70
71	bat_priv->dat.addr = (batadv_dat_addr_t)addr;
72}
73
74int batadv_dat_init(struct batadv_priv *bat_priv);
75void batadv_dat_free(struct batadv_priv *bat_priv);
76int batadv_dat_cache_dump(struct sk_buff *msg, struct netlink_callback *cb);
77
78/**
79 * batadv_dat_inc_counter() - increment the correct DAT packet counter
80 * @bat_priv: the bat priv with all the soft interface information
81 * @subtype: the 4addr subtype of the packet to be counted
82 *
83 * Updates the ethtool statistics for the received packet if it is a DAT subtype
84 */
85static inline void batadv_dat_inc_counter(struct batadv_priv *bat_priv,
86					  u8 subtype)
87{
88	switch (subtype) {
89	case BATADV_P_DAT_DHT_GET:
90		batadv_inc_counter(bat_priv,
91				   BATADV_CNT_DAT_GET_RX);
92		break;
93	case BATADV_P_DAT_DHT_PUT:
94		batadv_inc_counter(bat_priv,
95				   BATADV_CNT_DAT_PUT_RX);
96		break;
97	}
98}
99
100#else
101
102static inline void batadv_dat_status_update(struct net_device *net_dev)
103{
104}
105
106static inline bool
107batadv_dat_snoop_outgoing_arp_request(struct batadv_priv *bat_priv,
108				      struct sk_buff *skb)
109{
110	return false;
111}
112
113static inline bool
114batadv_dat_snoop_incoming_arp_request(struct batadv_priv *bat_priv,
115				      struct sk_buff *skb, int hdr_size)
116{
117	return false;
118}
119
120static inline bool
121batadv_dat_snoop_outgoing_arp_reply(struct batadv_priv *bat_priv,
122				    struct sk_buff *skb)
123{
124	return false;
125}
126
127static inline bool
128batadv_dat_snoop_incoming_arp_reply(struct batadv_priv *bat_priv,
129				    struct sk_buff *skb, int hdr_size)
130{
131	return false;
132}
133
134static inline void
135batadv_dat_snoop_outgoing_dhcp_ack(struct batadv_priv *bat_priv,
136				   struct sk_buff *skb, __be16 proto,
137				   unsigned short vid)
138{
139}
140
141static inline void
142batadv_dat_snoop_incoming_dhcp_ack(struct batadv_priv *bat_priv,
143				   struct sk_buff *skb, int hdr_size)
144{
145}
146
147static inline bool
148batadv_dat_drop_broadcast_packet(struct batadv_priv *bat_priv,
149				 struct batadv_forw_packet *forw_packet)
150{
151	return false;
152}
153
154static inline void
155batadv_dat_init_orig_node_addr(struct batadv_orig_node *orig_node)
156{
157}
158
159static inline void batadv_dat_init_own_addr(struct batadv_priv *bat_priv,
160					    struct batadv_hard_iface *iface)
161{
162}
163
164static inline int batadv_dat_init(struct batadv_priv *bat_priv)
165{
166	return 0;
167}
168
169static inline void batadv_dat_free(struct batadv_priv *bat_priv)
170{
171}
172
173static inline int
174batadv_dat_cache_dump(struct sk_buff *msg, struct netlink_callback *cb)
175{
176	return -EOPNOTSUPP;
177}
178
179static inline void batadv_dat_inc_counter(struct batadv_priv *bat_priv,
180					  u8 subtype)
181{
182}
183
184#endif /* CONFIG_BATMAN_ADV_DAT */
185
186#endif /* _NET_BATMAN_ADV_DISTRIBUTED_ARP_TABLE_H_ */
187