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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 #define BR_PORT_DEBOUNCE (HZ/10)
  31
  32 #define BR_VERSION      "2.1"
  33
  34 typedef struct bridge_id bridge_id;
  35 typedef struct mac_addr mac_addr;
  36 typedef __u16 port_id;
  37
  38 struct bridge_id
  39 {
  40         unsigned char   prio[2];
  41         unsigned char   addr[6];
  42 };
  43
  44 struct mac_addr
  45 {
  46         unsigned char   addr[6];
  47 };
  48
  49 struct net_bridge_fdb_entry
  50 {
  51         struct hlist_node               hlist;
  52         struct net_bridge_port          *dst;
  53
  54         struct rcu_head                 rcu;
  55         atomic_t                        use_count;
  56         unsigned long                   ageing_timer;
  57         mac_addr                        addr;
  58         unsigned char                   is_local;
  59         unsigned char                   is_static;
  60 };
  61
  62 struct net_bridge_port
  63 {
  64         struct net_bridge               *br;
  65         struct net_device               *dev;
  66         struct list_head                list;
  67
  68         /* STP */
  69         u8                              priority;
  70         u8                              state;
  71         u8                              deleted;
  72         u16                             port_no;
  73         unsigned char                   topology_change_ack;
  74         unsigned char                   config_pending;
  75         port_id                         port_id;
  76         port_id                         designated_port;
  77         bridge_id                       designated_root;
  78         bridge_id                       designated_bridge;
  79         u32                             path_cost;
  80         u32                             designated_cost;
  81
  82         struct timer_list               forward_delay_timer;
  83         struct timer_list               hold_timer;
  84         struct timer_list               message_age_timer;
  85         struct kobject                  kobj;
  86         struct work_struct              carrier_check;
  87         struct rcu_head                 rcu;
  88 };
  89
  90 struct net_bridge
  91 {
  92         spinlock_t                      lock;
  93         struct list_head                port_list;
  94         struct net_device               *dev;
  95         struct net_device_stats         statistics;
  96         spinlock_t                      hash_lock;
  97         struct hlist_head               hash[BR_HASH_SIZE];
  98         struct list_head                age_list;
  99         unsigned long                   feature_mask;
 100
 101         /* STP */
 102         bridge_id                       designated_root;
 103         bridge_id                       bridge_id;
 104         u32                             root_path_cost;
 105         unsigned long                   max_age;
 106         unsigned long                   hello_time;
 107         unsigned long                   forward_delay;
 108         unsigned long                   bridge_max_age;
 109         unsigned long                   ageing_time;
 110         unsigned long                   bridge_hello_time;
 111         unsigned long                   bridge_forward_delay;
 112
 113         u16                             root_port;
 114         unsigned char                   stp_enabled;
 115         unsigned char                   topology_change;
 116         unsigned char                   topology_change_detected;
 117
 118         struct timer_list               hello_timer;
 119         struct timer_list               tcn_timer;
 120         struct timer_list               topology_change_timer;
 121         struct timer_list               gc_timer;
 122         struct kobject                  ifobj;
 123 };
 124
 125 extern struct notifier_block br_device_notifier;
 126 extern const unsigned char bridge_ula[6];
 127
 128 /* called under bridge lock */
 129 static inline int br_is_root_bridge(const struct net_bridge *br)
 130 {
 131         return !memcmp(&br->bridge_id, &br->designated_root, 8);
 132 }
 133
 134
 135 /* br_device.c */
 136 extern void br_dev_setup(struct net_device *dev);
 137 extern int br_dev_xmit(struct sk_buff *skb, struct net_device *dev);
 138
 139 /* br_fdb.c */
 140 extern void br_fdb_init(void);
 141 extern void br_fdb_fini(void);
 142 extern void br_fdb_changeaddr(struct net_bridge_port *p,
 143                               const unsigned char *newaddr);
 144 extern void br_fdb_cleanup(unsigned long arg);
 145 extern void br_fdb_delete_by_port(struct net_bridge *br,
 146                            struct net_bridge_port *p);
 147 extern struct net_bridge_fdb_entry *__br_fdb_get(struct net_bridge *br,
 148                                                  const unsigned char *addr);
 149 extern struct net_bridge_fdb_entry *br_fdb_get(struct net_bridge *br,
 150                                                unsigned char *addr);
 151 extern void br_fdb_put(struct net_bridge_fdb_entry *ent);
 152 extern int br_fdb_fillbuf(struct net_bridge *br, void *buf,
 153                           unsigned long count, unsigned long off);
 154 extern int br_fdb_insert(struct net_bridge *br,
 155                          struct net_bridge_port *source,
 156                          const unsigned char *addr);
 157 extern void br_fdb_update(struct net_bridge *br,
 158                           struct net_bridge_port *source,
 159                           const unsigned char *addr);
 160
 161 /* br_forward.c */
 162 extern void br_deliver(const struct net_bridge_port *to,
 163                 struct sk_buff *skb);
 164 extern int br_dev_queue_push_xmit(struct sk_buff *skb);
 165 extern void br_forward(const struct net_bridge_port *to,
 166                 struct sk_buff *skb);
 167 extern int br_forward_finish(struct sk_buff *skb);
 168 extern void br_flood_deliver(struct net_bridge *br,
 169                       struct sk_buff *skb,
 170                       int clone);
 171 extern void br_flood_forward(struct net_bridge *br,
 172                       struct sk_buff *skb,
 173                       int clone);
 174
 175 /* br_if.c */
 176 extern int br_add_bridge(const char *name);
 177 extern int br_del_bridge(const char *name);
 178 extern void br_cleanup_bridges(void);
 179 extern int br_add_if(struct net_bridge *br,
 180               struct net_device *dev);
 181 extern int br_del_if(struct net_bridge *br,
 182               struct net_device *dev);
 183 extern int br_min_mtu(const struct net_bridge *br);
 184 extern void br_features_recompute(struct net_bridge *br);
 185
 186 /* br_input.c */
 187 extern int br_handle_frame_finish(struct sk_buff *skb);
 188 extern int br_handle_frame(struct net_bridge_port *p, struct sk_buff **pskb);
 189
 190 /* br_ioctl.c */
 191 extern int br_dev_ioctl(struct net_device *dev, struct ifreq *rq, int cmd);
 192 extern int br_ioctl_deviceless_stub(unsigned int cmd, void __user *arg);
 193
 194 /* br_netfilter.c */
 195 extern int br_netfilter_init(void);
 196 extern void br_netfilter_fini(void);
 197
 198 /* br_stp.c */
 199 extern void br_log_state(const struct net_bridge_port *p);
 200 extern struct net_bridge_port *br_get_port(struct net_bridge *br,
 201                                            u16 port_no);
 202 extern void br_init_port(struct net_bridge_port *p);
 203 extern void br_become_designated_port(struct net_bridge_port *p);
 204
 205 /* br_stp_if.c */
 206 extern void br_stp_enable_bridge(struct net_bridge *br);
 207 extern void br_stp_disable_bridge(struct net_bridge *br);
 208 extern void br_stp_enable_port(struct net_bridge_port *p);
 209 extern void br_stp_disable_port(struct net_bridge_port *p);
 210 extern void br_stp_recalculate_bridge_id(struct net_bridge *br);
 211 extern void br_stp_change_bridge_id(struct net_bridge *br, const unsigned char *a);
 212 extern void br_stp_set_bridge_priority(struct net_bridge *br,
 213                                        u16 newprio);
 214 extern void br_stp_set_port_priority(struct net_bridge_port *p,
 215                                      u8 newprio);
 216 extern void br_stp_set_path_cost(struct net_bridge_port *p,
 217                                  u32 path_cost);
 218 extern ssize_t br_show_bridge_id(char *buf, const struct bridge_id *id);
 219
 220 /* br_stp_bpdu.c */
 221 extern int br_stp_handle_bpdu(struct sk_buff *skb);
 222
 223 /* br_stp_timer.c */
 224 extern void br_stp_timer_init(struct net_bridge *br);
 225 extern void br_stp_port_timer_init(struct net_bridge_port *p);
 226 extern unsigned long br_timer_value(const struct timer_list *timer);
 227
 228 /* br.c */
 229 extern struct net_bridge_fdb_entry *(*br_fdb_get_hook)(struct net_bridge *br,
 230                                                        unsigned char *addr);
 231 extern void (*br_fdb_put_hook)(struct net_bridge_fdb_entry *ent);
 232
 233
 234 #ifdef CONFIG_SYSFS
 235 /* br_sysfs_if.c */
 236 extern int br_sysfs_addif(struct net_bridge_port *p);
 237 extern void br_sysfs_removeif(struct net_bridge_port *p);
 238 extern void br_sysfs_freeif(struct net_bridge_port *p);
 239
 240 /* br_sysfs_br.c */
 241 extern int br_sysfs_addbr(struct net_device *dev);
 242 extern void br_sysfs_delbr(struct net_device *dev);
 243
 244 #else
 245
 246 #define br_sysfs_addif(p)       (0)
 247 #define br_sysfs_removeif(p)    do { } while(0)
 248 #define br_sysfs_freeif(p)      kfree(p)
 249 #define br_sysfs_addbr(dev)     (0)
 250 #define br_sysfs_delbr(dev)     do { } while(0)
 251 #endif /* CONFIG_SYSFS */
 252
 253 #endif