net/batman-adv/bridge_loop_avoidance.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 /* Copyright (C) 2011-2017  B.A.T.M.A.N. contributors:
   3  *
   4  * Simon Wunderlich
   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_BLA_H_
  20 #define _NET_BATMAN_ADV_BLA_H_
  21
  22 #include "main.h"
  23
  24 #include <linux/compiler.h>
  25 #include <linux/stddef.h>
  26 #include <linux/types.h>
  27
  28 struct net_device;
  29 struct netlink_callback;
  30 struct seq_file;
  31 struct sk_buff;
  32
  33 /**
  34  * batadv_bla_is_loopdetect_mac() - check if the mac address is from a loop
  35  *  detect frame sent by bridge loop avoidance
  36  * @mac: mac address to check
  37  *
  38  * Return: true if the it looks like a loop detect frame
  39  * (mac starts with BA:BE), false otherwise
  40  */
  41 static inline bool batadv_bla_is_loopdetect_mac(const uint8_t *mac)
  42 {
  43         if (mac[0] == 0xba && mac[1] == 0xbe)
  44                 return true;
  45
  46         return false;
  47 }
  48
  49 #ifdef CONFIG_BATMAN_ADV_BLA
  50 bool batadv_bla_rx(struct batadv_priv *bat_priv, struct sk_buff *skb,
  51                    unsigned short vid, bool is_bcast);
  52 bool batadv_bla_tx(struct batadv_priv *bat_priv, struct sk_buff *skb,
  53                    unsigned short vid);
  54 bool batadv_bla_is_backbone_gw(struct sk_buff *skb,
  55                                struct batadv_orig_node *orig_node,
  56                                int hdr_size);
  57 int batadv_bla_claim_table_seq_print_text(struct seq_file *seq, void *offset);
  58 int batadv_bla_claim_dump(struct sk_buff *msg, struct netlink_callback *cb);
  59 int batadv_bla_backbone_table_seq_print_text(struct seq_file *seq,
  60                                              void *offset);
  61 int batadv_bla_backbone_dump(struct sk_buff *msg, struct netlink_callback *cb);
  62 bool batadv_bla_is_backbone_gw_orig(struct batadv_priv *bat_priv, u8 *orig,
  63                                     unsigned short vid);
  64 bool batadv_bla_check_bcast_duplist(struct batadv_priv *bat_priv,
  65                                     struct sk_buff *skb);
  66 void batadv_bla_update_orig_address(struct batadv_priv *bat_priv,
  67                                     struct batadv_hard_iface *primary_if,
  68                                     struct batadv_hard_iface *oldif);
  69 void batadv_bla_status_update(struct net_device *net_dev);
  70 int batadv_bla_init(struct batadv_priv *bat_priv);
  71 void batadv_bla_free(struct batadv_priv *bat_priv);
  72 int batadv_bla_claim_dump(struct sk_buff *msg, struct netlink_callback *cb);
  73 #ifdef CONFIG_BATMAN_ADV_DAT
  74 bool batadv_bla_check_claim(struct batadv_priv *bat_priv, u8 *addr,
  75                             unsigned short vid);
  76 #endif
  77 #define BATADV_BLA_CRC_INIT     0
  78 #else /* ifdef CONFIG_BATMAN_ADV_BLA */
  79
  80 static inline bool batadv_bla_rx(struct batadv_priv *bat_priv,
  81                                  struct sk_buff *skb, unsigned short vid,
  82                                  bool is_bcast)
  83 {
  84         return false;
  85 }
  86
  87 static inline bool batadv_bla_tx(struct batadv_priv *bat_priv,
  88                                  struct sk_buff *skb, unsigned short vid)
  89 {
  90         return false;
  91 }
  92
  93 static inline bool batadv_bla_is_backbone_gw(struct sk_buff *skb,
  94                                              struct batadv_orig_node *orig_node,
  95                                              int hdr_size)
  96 {
  97         return false;
  98 }
  99
 100 static inline int batadv_bla_claim_table_seq_print_text(struct seq_file *seq,
 101                                                         void *offset)
 102 {
 103         return 0;
 104 }
 105
 106 static inline int batadv_bla_backbone_table_seq_print_text(struct seq_file *seq,
 107                                                            void *offset)
 108 {
 109         return 0;
 110 }
 111
 112 static inline bool batadv_bla_is_backbone_gw_orig(struct batadv_priv *bat_priv,
 113                                                   u8 *orig, unsigned short vid)
 114 {
 115         return false;
 116 }
 117
 118 static inline bool
 119 batadv_bla_check_bcast_duplist(struct batadv_priv *bat_priv,
 120                                struct sk_buff *skb)
 121 {
 122         return false;
 123 }
 124
 125 static inline void
 126 batadv_bla_update_orig_address(struct batadv_priv *bat_priv,
 127                                struct batadv_hard_iface *primary_if,
 128                                struct batadv_hard_iface *oldif)
 129 {
 130 }
 131
 132 static inline int batadv_bla_init(struct batadv_priv *bat_priv)
 133 {
 134         return 1;
 135 }
 136
 137 static inline void batadv_bla_free(struct batadv_priv *bat_priv)
 138 {
 139 }
 140
 141 static inline int batadv_bla_claim_dump(struct sk_buff *msg,
 142                                         struct netlink_callback *cb)
 143 {
 144         return -EOPNOTSUPP;
 145 }
 146
 147 static inline int batadv_bla_backbone_dump(struct sk_buff *msg,
 148                                            struct netlink_callback *cb)
 149 {
 150         return -EOPNOTSUPP;
 151 }
 152
 153 static inline
 154 bool batadv_bla_check_claim(struct batadv_priv *bat_priv, u8 *addr,
 155                             unsigned short vid)
 156 {
 157         return true;
 158 }
 159
 160 #endif /* ifdef CONFIG_BATMAN_ADV_BLA */
 161
 162 #endif /* ifndef _NET_BATMAN_ADV_BLA_H_ */