1/* SPDX-License-Identifier: GPL-2.0 */
2/* Copyright (C) 2011-2020  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/seq_file.h>
16#include <linux/skbuff.h>
17#include <linux/types.h>
18#include <uapi/linux/batadv_packet.h>
19
20#include "originator.h"
21
22#ifdef CONFIG_BATMAN_ADV_DAT
23
24/* BATADV_DAT_ADDR_MAX - maximum address value in the DHT space */
25#define BATADV_DAT_ADDR_MAX ((batadv_dat_addr_t)~(batadv_dat_addr_t)0)
26
27void batadv_dat_status_update(struct net_device *net_dev);
28bool batadv_dat_snoop_outgoing_arp_request(struct batadv_priv *bat_priv,
29					   struct sk_buff *skb);
30bool batadv_dat_snoop_incoming_arp_request(struct batadv_priv *bat_priv,
31					   struct sk_buff *skb, int hdr_size);
32void batadv_dat_snoop_outgoing_arp_reply(struct batadv_priv *bat_priv,
33					 struct sk_buff *skb);
34bool batadv_dat_snoop_incoming_arp_reply(struct batadv_priv *bat_priv,
35					 struct sk_buff *skb, int hdr_size);
36void batadv_dat_snoop_outgoing_dhcp_ack(struct batadv_priv *bat_priv,
37					struct sk_buff *skb,
38					__be16 proto,
39					unsigned short vid);
40void batadv_dat_snoop_incoming_dhcp_ack(struct batadv_priv *bat_priv,
41					struct sk_buff *skb, int hdr_size);
42bool batadv_dat_drop_broadcast_packet(struct batadv_priv *bat_priv,
43				      struct batadv_forw_packet *forw_packet);
44
45/**
46 * batadv_dat_init_orig_node_addr() - assign a DAT address to the orig_node
47 * @orig_node: the node to assign the DAT address to
48 */
49static inline void
50batadv_dat_init_orig_node_addr(struct batadv_orig_node *orig_node)
51{
52	u32 addr;
53
54	addr = batadv_choose_orig(orig_node->orig, BATADV_DAT_ADDR_MAX);
55	orig_node->dat_addr = (batadv_dat_addr_t)addr;
56}
57
58/**
59 * batadv_dat_init_own_addr() - assign a DAT address to the node itself
60 * @bat_priv: the bat priv with all the soft interface information
61 * @primary_if: a pointer to the primary interface
62 */
63static inline void
64batadv_dat_init_own_addr(struct batadv_priv *bat_priv,
65			 struct batadv_hard_iface *primary_if)
66{
67	u32 addr;
68
69	addr = batadv_choose_orig(primary_if->net_dev->dev_addr,
70				  BATADV_DAT_ADDR_MAX);
71
72	bat_priv->dat.addr = (batadv_dat_addr_t)addr;
73}
74
75int batadv_dat_init(struct batadv_priv *bat_priv);
76void batadv_dat_free(struct batadv_priv *bat_priv);
77int batadv_dat_cache_seq_print_text(struct seq_file *seq, void *offset);
78int batadv_dat_cache_dump(struct sk_buff *msg, struct netlink_callback *cb);
79
80/**
81 * batadv_dat_inc_counter() - increment the correct DAT packet counter
82 * @bat_priv: the bat priv with all the soft interface information
83 * @subtype: the 4addr subtype of the packet to be counted
84 *
85 * Updates the ethtool statistics for the received packet if it is a DAT subtype
86 */
87static inline void batadv_dat_inc_counter(struct batadv_priv *bat_priv,
88					  u8 subtype)
89{
90	switch (subtype) {
91	case BATADV_P_DAT_DHT_GET:
92		batadv_inc_counter(bat_priv,
93				   BATADV_CNT_DAT_GET_RX);
94		break;
95	case BATADV_P_DAT_DHT_PUT:
96		batadv_inc_counter(bat_priv,
97				   BATADV_CNT_DAT_PUT_RX);
98		break;
99	}
100}
101
102#else
103
104static inline void batadv_dat_status_update(struct net_device *net_dev)
105{
106}
107
108static inline bool
109batadv_dat_snoop_outgoing_arp_request(struct batadv_priv *bat_priv,
110				      struct sk_buff *skb)
111{
112	return false;
113}
114
115static inline bool
116batadv_dat_snoop_incoming_arp_request(struct batadv_priv *bat_priv,
117				      struct sk_buff *skb, int hdr_size)
118{
119	return false;
120}
121
122static inline bool
123batadv_dat_snoop_outgoing_arp_reply(struct batadv_priv *bat_priv,
124				    struct sk_buff *skb)
125{
126	return false;
127}
128
129static inline bool
130batadv_dat_snoop_incoming_arp_reply(struct batadv_priv *bat_priv,
131				    struct sk_buff *skb, int hdr_size)
132{
133	return false;
134}
135
136static inline void
137batadv_dat_snoop_outgoing_dhcp_ack(struct batadv_priv *bat_priv,
138				   struct sk_buff *skb, __be16 proto,
139				   unsigned short vid)
140{
141}
142
143static inline void
144batadv_dat_snoop_incoming_dhcp_ack(struct batadv_priv *bat_priv,
145				   struct sk_buff *skb, int hdr_size)
146{
147}
148
149static inline bool
150batadv_dat_drop_broadcast_packet(struct batadv_priv *bat_priv,
151				 struct batadv_forw_packet *forw_packet)
152{
153	return false;
154}
155
156static inline void
157batadv_dat_init_orig_node_addr(struct batadv_orig_node *orig_node)
158{
159}
160
161static inline void batadv_dat_init_own_addr(struct batadv_priv *bat_priv,
162					    struct batadv_hard_iface *iface)
163{
164}
165
166static inline int batadv_dat_init(struct batadv_priv *bat_priv)
167{
168	return 0;
169}
170
171static inline void batadv_dat_free(struct batadv_priv *bat_priv)
172{
173}
174
175static inline int
176batadv_dat_cache_dump(struct sk_buff *msg, struct netlink_callback *cb)
177{
178	return -EOPNOTSUPP;
179}
180
181static inline void batadv_dat_inc_counter(struct batadv_priv *bat_priv,
182					  u8 subtype)
183{
184}
185
186#endif /* CONFIG_BATMAN_ADV_DAT */
187
188#endif /* _NET_BATMAN_ADV_DISTRIBUTED_ARP_TABLE_H_ */
189