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   1 /*
   2  *      Linux ethernet bridge
   3  *
   4  *      Authors:
   5  *      Lennert Buytenhek               <buytenh@gnu.org>
   6  *
   7  *      $Id: br_private.h,v 1.7 2001/12/24 00:59:55 davem Exp $
   8  *
   9  *      This program is free software; you can redistribute it and/or
  10  *      modify it under the terms of the GNU General Public License
  11  *      as published by the Free Software Foundation; either version
  12  *      2 of the License, or (at your option) any later version.
  13  */
  14
  15 #ifndef _BR_PRIVATE_H
  16 #define _BR_PRIVATE_H
  17
  18 #include <linux/netdevice.h>
  19 #include <linux/miscdevice.h>
  20 #include <linux/if_bridge.h>
  21
  22 #define BR_HASH_BITS 8
  23 #define BR_HASH_SIZE (1 << BR_HASH_BITS)
  24
  25 #define BR_HOLD_TIME (1*HZ)
  26
  27 #define BR_PORT_BITS    10
  28 #define BR_MAX_PORTS    (1<<BR_PORT_BITS)
  29
  30 typedef struct bridge_id bridge_id;
  31 typedef struct mac_addr mac_addr;
  32 typedef __u16 port_id;
  33
  34 struct bridge_id
  35 {
  36         unsigned char   prio[2];
  37         unsigned char   addr[6];
  38 };
  39
  40 struct mac_addr
  41 {
  42         unsigned char   addr[6];
  43 };
  44
  45 struct net_bridge_fdb_entry
  46 {
  47         struct hlist_node               hlist;
  48         struct net_bridge_port          *dst;
  49
  50         struct rcu_head                 rcu;
  51         atomic_t                        use_count;
  52         unsigned long                   ageing_timer;
  53         mac_addr                        addr;
  54         unsigned char                   is_local;
  55         unsigned char                   is_static;
  56 };
  57
  58 struct net_bridge_port
  59 {
  60         struct net_bridge               *br;
  61         struct net_device               *dev;
  62         struct list_head                list;
  63
  64         /* STP */
  65         u8                              priority;
  66         u8                              state;
  67         u16                             port_no;
  68         unsigned char                   topology_change_ack;
  69         unsigned char                   config_pending;
  70         port_id                         port_id;
  71         port_id                         designated_port;
  72         bridge_id                       designated_root;
  73         bridge_id                       designated_bridge;
  74         u32                             path_cost;
  75         u32                             designated_cost;
  76
  77         struct timer_list               forward_delay_timer;
  78         struct timer_list               hold_timer;
  79         struct timer_list               message_age_timer;
  80         struct kobject                  kobj;
  81         struct rcu_head                 rcu;
  82 };
  83
  84 struct net_bridge
  85 {
  86         spinlock_t                      lock;
  87         struct list_head                port_list;
  88         struct net_device               *dev;
  89         struct net_device_stats         statistics;
  90         spinlock_t                      hash_lock;
  91         struct hlist_head               hash[BR_HASH_SIZE];
  92         struct list_head                age_list;
  93
  94         /* STP */
  95         bridge_id                       designated_root;
  96         bridge_id                       bridge_id;
  97         u32                             root_path_cost;
  98         unsigned long                   max_age;
  99         unsigned long                   hello_time;
 100         unsigned long                   forward_delay;
 101         unsigned long                   bridge_max_age;
 102         unsigned long                   ageing_time;
 103         unsigned long                   bridge_hello_time;
 104         unsigned long                   bridge_forward_delay;
 105
 106         u16                             root_port;
 107         unsigned char                   stp_enabled;
 108         unsigned char                   topology_change;
 109         unsigned char                   topology_change_detected;
 110
 111         struct timer_list               hello_timer;
 112         struct timer_list               tcn_timer;
 113         struct timer_list               topology_change_timer;
 114         struct timer_list               gc_timer;
 115         struct kobject                  ifobj;
 116 };
 117
 118 extern struct notifier_block br_device_notifier;
 119 extern const unsigned char bridge_ula[6];
 120
 121 /* called under bridge lock */
 122 static inline int br_is_root_bridge(const struct net_bridge *br)
 123 {
 124         return !memcmp(&br->bridge_id, &br->designated_root, 8);
 125 }
 126
 127
 128 /* br_device.c */
 129 extern void br_dev_setup(struct net_device *dev);
 130 extern int br_dev_xmit(struct sk_buff *skb, struct net_device *dev);
 131
 132 /* br_fdb.c */
 133 extern void br_fdb_init(void);
 134 extern void br_fdb_fini(void);
 135 extern void br_fdb_changeaddr(struct net_bridge_port *p,
 136                               const unsigned char *newaddr);
 137 extern void br_fdb_cleanup(unsigned long arg);
 138 extern void br_fdb_delete_by_port(struct net_bridge *br,
 139                            struct net_bridge_port *p);
 140 extern struct net_bridge_fdb_entry *__br_fdb_get(struct net_bridge *br,
 141                                                  const unsigned char *addr);
 142 extern struct net_bridge_fdb_entry *br_fdb_get(struct net_bridge *br,
 143                                                unsigned char *addr);
 144 extern void br_fdb_put(struct net_bridge_fdb_entry *ent);
 145 extern int br_fdb_fillbuf(struct net_bridge *br, void *buf,
 146                           unsigned long count, unsigned long off);
 147 extern int br_fdb_insert(struct net_bridge *br,
 148                          struct net_bridge_port *source,
 149                          const unsigned char *addr);
 150 extern void br_fdb_update(struct net_bridge *br,
 151                           struct net_bridge_port *source,
 152                           const unsigned char *addr);
 153
 154 /* br_forward.c */
 155 extern void br_deliver(const struct net_bridge_port *to,
 156                 struct sk_buff *skb);
 157 extern int br_dev_queue_push_xmit(struct sk_buff *skb);
 158 extern void br_forward(const struct net_bridge_port *to,
 159                 struct sk_buff *skb);
 160 extern int br_forward_finish(struct sk_buff *skb);
 161 extern void br_flood_deliver(struct net_bridge *br,
 162                       struct sk_buff *skb,
 163                       int clone);
 164 extern void br_flood_forward(struct net_bridge *br,
 165                       struct sk_buff *skb,
 166                       int clone);
 167
 168 /* br_if.c */
 169 extern int br_add_bridge(const char *name);
 170 extern int br_del_bridge(const char *name);
 171 extern void br_cleanup_bridges(void);
 172 extern int br_add_if(struct net_bridge *br,
 173               struct net_device *dev);
 174 extern int br_del_if(struct net_bridge *br,
 175               struct net_device *dev);
 176 extern int br_min_mtu(const struct net_bridge *br);
 177 extern void br_features_recompute(struct net_bridge *br);
 178
 179 /* br_input.c */
 180 extern int br_handle_frame_finish(struct sk_buff *skb);
 181 extern int br_handle_frame(struct net_bridge_port *p, struct sk_buff **pskb);
 182
 183 /* br_ioctl.c */
 184 extern int br_dev_ioctl(struct net_device *dev, struct ifreq *rq, int cmd);
 185 extern int br_ioctl_deviceless_stub(unsigned int cmd, void __user *arg);
 186
 187 /* br_netfilter.c */
 188 extern int br_netfilter_init(void);
 189 extern void br_netfilter_fini(void);
 190
 191 /* br_stp.c */
 192 extern void br_log_state(const struct net_bridge_port *p);
 193 extern struct net_bridge_port *br_get_port(struct net_bridge *br,
 194                                            u16 port_no);
 195 extern void br_init_port(struct net_bridge_port *p);
 196 extern void br_become_designated_port(struct net_bridge_port *p);
 197
 198 /* br_stp_if.c */
 199 extern void br_stp_enable_bridge(struct net_bridge *br);
 200 extern void br_stp_disable_bridge(struct net_bridge *br);
 201 extern void br_stp_enable_port(struct net_bridge_port *p);
 202 extern void br_stp_disable_port(struct net_bridge_port *p);
 203 extern void br_stp_recalculate_bridge_id(struct net_bridge *br);
 204 extern void br_stp_set_bridge_priority(struct net_bridge *br,
 205                                        u16 newprio);
 206 extern void br_stp_set_port_priority(struct net_bridge_port *p,
 207                                      u8 newprio);
 208 extern void br_stp_set_path_cost(struct net_bridge_port *p,
 209                                  u32 path_cost);
 210 extern ssize_t br_show_bridge_id(char *buf, const struct bridge_id *id);
 211
 212 /* br_stp_bpdu.c */
 213 extern int br_stp_handle_bpdu(struct sk_buff *skb);
 214
 215 /* br_stp_timer.c */
 216 extern void br_stp_timer_init(struct net_bridge *br);
 217 extern void br_stp_port_timer_init(struct net_bridge_port *p);
 218 extern unsigned long br_timer_value(const struct timer_list *timer);
 219
 220 /* br.c */
 221 extern struct net_bridge_fdb_entry *(*br_fdb_get_hook)(struct net_bridge *br,
 222                                                        unsigned char *addr);
 223 extern void (*br_fdb_put_hook)(struct net_bridge_fdb_entry *ent);
 224
 225
 226 #ifdef CONFIG_SYSFS
 227 /* br_sysfs_if.c */
 228 extern int br_sysfs_addif(struct net_bridge_port *p);
 229 extern void br_sysfs_removeif(struct net_bridge_port *p);
 230 extern void br_sysfs_freeif(struct net_bridge_port *p);
 231
 232 /* br_sysfs_br.c */
 233 extern int br_sysfs_addbr(struct net_device *dev);
 234 extern void br_sysfs_delbr(struct net_device *dev);
 235
 236 #else
 237
 238 #define br_sysfs_addif(p)       (0)
 239 #define br_sysfs_removeif(p)    do { } while(0)
 240 #define br_sysfs_freeif(p)      kfree(p)
 241 #define br_sysfs_addbr(dev)     (0)
 242 #define br_sysfs_delbr(dev)     do { } while(0)
 243 #endif /* CONFIG_SYSFS */
 244
 245 #endif