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

   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_ */