net/batman-adv/distributed-arp-table.h

   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
  26 void batadv_dat_status_update(struct net_device *net_dev);
  27 bool batadv_dat_snoop_outgoing_arp_request(struct batadv_priv *bat_priv,
  28                                            struct sk_buff *skb);
  29 bool batadv_dat_snoop_incoming_arp_request(struct batadv_priv *bat_priv,
  30                                            struct sk_buff *skb, int hdr_size);
  31 void batadv_dat_snoop_outgoing_arp_reply(struct batadv_priv *bat_priv,
  32                                          struct sk_buff *skb);
  33 bool batadv_dat_snoop_incoming_arp_reply(struct batadv_priv *bat_priv,
  34                                          struct sk_buff *skb, int hdr_size);
  35 void batadv_dat_snoop_outgoing_dhcp_ack(struct batadv_priv *bat_priv,
  36                                         struct sk_buff *skb,
  37                                         __be16 proto,
  38                                         unsigned short vid);
  39 void batadv_dat_snoop_incoming_dhcp_ack(struct batadv_priv *bat_priv,
  40                                         struct sk_buff *skb, int hdr_size);
  41 bool 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  */
  48 static inline void
  49 batadv_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  */
  62 static inline void
  63 batadv_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
  74 int batadv_dat_init(struct batadv_priv *bat_priv);
  75 void batadv_dat_free(struct batadv_priv *bat_priv);
  76 int 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  */
  85 static 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
 102 static inline void batadv_dat_status_update(struct net_device *net_dev)
 103 {
 104 }
 105
 106 static inline bool
 107 batadv_dat_snoop_outgoing_arp_request(struct batadv_priv *bat_priv,
 108                                       struct sk_buff *skb)
 109 {
 110         return false;
 111 }
 112
 113 static inline bool
 114 batadv_dat_snoop_incoming_arp_request(struct batadv_priv *bat_priv,
 115                                       struct sk_buff *skb, int hdr_size)
 116 {
 117         return false;
 118 }
 119
 120 static inline bool
 121 batadv_dat_snoop_outgoing_arp_reply(struct batadv_priv *bat_priv,
 122                                     struct sk_buff *skb)
 123 {
 124         return false;
 125 }
 126
 127 static inline bool
 128 batadv_dat_snoop_incoming_arp_reply(struct batadv_priv *bat_priv,
 129                                     struct sk_buff *skb, int hdr_size)
 130 {
 131         return false;
 132 }
 133
 134 static inline void
 135 batadv_dat_snoop_outgoing_dhcp_ack(struct batadv_priv *bat_priv,
 136                                    struct sk_buff *skb, __be16 proto,
 137                                    unsigned short vid)
 138 {
 139 }
 140
 141 static inline void
 142 batadv_dat_snoop_incoming_dhcp_ack(struct batadv_priv *bat_priv,
 143                                    struct sk_buff *skb, int hdr_size)
 144 {
 145 }
 146
 147 static inline bool
 148 batadv_dat_drop_broadcast_packet(struct batadv_priv *bat_priv,
 149                                  struct batadv_forw_packet *forw_packet)
 150 {
 151         return false;
 152 }
 153
 154 static inline void
 155 batadv_dat_init_orig_node_addr(struct batadv_orig_node *orig_node)
 156 {
 157 }
 158
 159 static inline void batadv_dat_init_own_addr(struct batadv_priv *bat_priv,
 160                                             struct batadv_hard_iface *iface)
 161 {
 162 }
 163
 164 static inline int batadv_dat_init(struct batadv_priv *bat_priv)
 165 {
 166         return 0;
 167 }
 168
 169 static inline void batadv_dat_free(struct batadv_priv *bat_priv)
 170 {
 171 }
 172
 173 static inline int
 174 batadv_dat_cache_dump(struct sk_buff *msg, struct netlink_callback *cb)
 175 {
 176         return -EOPNOTSUPP;
 177 }
 178
 179 static 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_ */