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 
27 void batadv_dat_status_update(struct net_device *net_dev);
28 bool batadv_dat_snoop_outgoing_arp_request(struct batadv_priv *bat_priv,
29 					   struct sk_buff *skb);
30 bool batadv_dat_snoop_incoming_arp_request(struct batadv_priv *bat_priv,
31 					   struct sk_buff *skb, int hdr_size);
32 void batadv_dat_snoop_outgoing_arp_reply(struct batadv_priv *bat_priv,
33 					 struct sk_buff *skb);
34 bool batadv_dat_snoop_incoming_arp_reply(struct batadv_priv *bat_priv,
35 					 struct sk_buff *skb, int hdr_size);
36 void batadv_dat_snoop_outgoing_dhcp_ack(struct batadv_priv *bat_priv,
37 					struct sk_buff *skb,
38 					__be16 proto,
39 					unsigned short vid);
40 void batadv_dat_snoop_incoming_dhcp_ack(struct batadv_priv *bat_priv,
41 					struct sk_buff *skb, int hdr_size);
42 bool 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  */
49 static inline void
50 batadv_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  */
63 static inline void
64 batadv_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 
75 int batadv_dat_init(struct batadv_priv *bat_priv);
76 void batadv_dat_free(struct batadv_priv *bat_priv);
77 int batadv_dat_cache_seq_print_text(struct seq_file *seq, void *offset);
78 int 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  */
87 static 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 
104 static inline void batadv_dat_status_update(struct net_device *net_dev)
105 {
106 }
107 
108 static inline bool
109 batadv_dat_snoop_outgoing_arp_request(struct batadv_priv *bat_priv,
110 				      struct sk_buff *skb)
111 {
112 	return false;
113 }
114 
115 static inline bool
116 batadv_dat_snoop_incoming_arp_request(struct batadv_priv *bat_priv,
117 				      struct sk_buff *skb, int hdr_size)
118 {
119 	return false;
120 }
121 
122 static inline bool
123 batadv_dat_snoop_outgoing_arp_reply(struct batadv_priv *bat_priv,
124 				    struct sk_buff *skb)
125 {
126 	return false;
127 }
128 
129 static inline bool
130 batadv_dat_snoop_incoming_arp_reply(struct batadv_priv *bat_priv,
131 				    struct sk_buff *skb, int hdr_size)
132 {
133 	return false;
134 }
135 
136 static inline void
137 batadv_dat_snoop_outgoing_dhcp_ack(struct batadv_priv *bat_priv,
138 				   struct sk_buff *skb, __be16 proto,
139 				   unsigned short vid)
140 {
141 }
142 
143 static inline void
144 batadv_dat_snoop_incoming_dhcp_ack(struct batadv_priv *bat_priv,
145 				   struct sk_buff *skb, int hdr_size)
146 {
147 }
148 
149 static inline bool
150 batadv_dat_drop_broadcast_packet(struct batadv_priv *bat_priv,
151 				 struct batadv_forw_packet *forw_packet)
152 {
153 	return false;
154 }
155 
156 static inline void
157 batadv_dat_init_orig_node_addr(struct batadv_orig_node *orig_node)
158 {
159 }
160 
161 static inline void batadv_dat_init_own_addr(struct batadv_priv *bat_priv,
162 					    struct batadv_hard_iface *iface)
163 {
164 }
165 
166 static inline int batadv_dat_init(struct batadv_priv *bat_priv)
167 {
168 	return 0;
169 }
170 
171 static inline void batadv_dat_free(struct batadv_priv *bat_priv)
172 {
173 }
174 
175 static inline int
176 batadv_dat_cache_dump(struct sk_buff *msg, struct netlink_callback *cb)
177 {
178 	return -EOPNOTSUPP;
179 }
180 
181 static 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