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   1 /*
   2  *      Linux ethernet bridge
   3  *
   4  *      Authors:
   5  *      Lennert Buytenhek               <buytenh@gnu.org>
   6  *
   7  *      This program is free software; you can redistribute it and/or
   8  *      modify it under the terms of the GNU General Public License
   9  *      as published by the Free Software Foundation; either version
  10  *      2 of the License, or (at your option) any later version.
  11  */
  12
  13 #ifndef _BR_PRIVATE_H
  14 #define _BR_PRIVATE_H
  15
  16 #include <linux/netdevice.h>
  17 #include <linux/if_bridge.h>
  18 #include <net/route.h>
  19
  20 #define BR_HASH_BITS 8
  21 #define BR_HASH_SIZE (1 << BR_HASH_BITS)
  22
  23 #define BR_HOLD_TIME (1*HZ)
  24
  25 #define BR_PORT_BITS    10
  26 #define BR_MAX_PORTS    (1<<BR_PORT_BITS)
  27
  28 #define BR_VERSION      "2.3"
  29
  30 /* Path to usermode spanning tree program */
  31 #define BR_STP_PROG     "/sbin/bridge-stp"
  32
  33 typedef struct bridge_id bridge_id;
  34 typedef struct mac_addr mac_addr;
  35 typedef __u16 port_id;
  36
  37 struct bridge_id
  38 {
  39         unsigned char   prio[2];
  40         unsigned char   addr[6];
  41 };
  42
  43 struct mac_addr
  44 {
  45         unsigned char   addr[6];
  46 };
  47
  48 struct net_bridge_fdb_entry
  49 {
  50         struct hlist_node               hlist;
  51         struct net_bridge_port          *dst;
  52
  53         struct rcu_head                 rcu;
  54         unsigned long                   ageing_timer;
  55         mac_addr                        addr;
  56         unsigned char                   is_local;
  57         unsigned char                   is_static;
  58 };
  59
  60 struct net_bridge_port
  61 {
  62         struct net_bridge               *br;
  63         struct net_device               *dev;
  64         struct list_head                list;
  65
  66         /* STP */
  67         u8                              priority;
  68         u8                              state;
  69         u16                             port_no;
  70         unsigned char                   topology_change_ack;
  71         unsigned char                   config_pending;
  72         port_id                         port_id;
  73         port_id                         designated_port;
  74         bridge_id                       designated_root;
  75         bridge_id                       designated_bridge;
  76         u32                             path_cost;
  77         u32                             designated_cost;
  78
  79         struct timer_list               forward_delay_timer;
  80         struct timer_list               hold_timer;
  81         struct timer_list               message_age_timer;
  82         struct kobject                  kobj;
  83         struct rcu_head                 rcu;
  84
  85         unsigned long                   flags;
  86 #define BR_HAIRPIN_MODE         0x00000001
  87 };
  88
  89 struct net_bridge
  90 {
  91         spinlock_t                      lock;
  92         struct list_head                port_list;
  93         struct net_device               *dev;
  94         spinlock_t                      hash_lock;
  95         struct hlist_head               hash[BR_HASH_SIZE];
  96         unsigned long                   feature_mask;
  97 #ifdef CONFIG_BRIDGE_NETFILTER
  98         struct rtable                   fake_rtable;
  99 #endif
 100         unsigned long                   flags;
 101 #define BR_SET_MAC_ADDR         0x00000001
 102
 103         /* STP */
 104         bridge_id                       designated_root;
 105         bridge_id                       bridge_id;
 106         u32                             root_path_cost;
 107         unsigned long                   max_age;
 108         unsigned long                   hello_time;
 109         unsigned long                   forward_delay;
 110         unsigned long                   bridge_max_age;
 111         unsigned long                   ageing_time;
 112         unsigned long                   bridge_hello_time;
 113         unsigned long                   bridge_forward_delay;
 114
 115         u8                              group_addr[ETH_ALEN];
 116         u16                             root_port;
 117
 118         enum {
 119                 BR_NO_STP,              /* no spanning tree */
 120                 BR_KERNEL_STP,          /* old STP in kernel */
 121                 BR_USER_STP,            /* new RSTP in userspace */
 122         } stp_enabled;
 123
 124         unsigned char                   topology_change;
 125         unsigned char                   topology_change_detected;
 126
 127         struct timer_list               hello_timer;
 128         struct timer_list               tcn_timer;
 129         struct timer_list               topology_change_timer;
 130         struct timer_list               gc_timer;
 131         struct kobject                  *ifobj;
 132 };
 133
 134 struct br_input_skb_cb {
 135         struct net_device *brdev;
 136 };
 137
 138 #define BR_INPUT_SKB_CB(__skb)  ((struct br_input_skb_cb *)(__skb)->cb)
 139
 140 extern struct notifier_block br_device_notifier;
 141 extern const u8 br_group_address[ETH_ALEN];
 142
 143 /* called under bridge lock */
 144 static inline int br_is_root_bridge(const struct net_bridge *br)
 145 {
 146         return !memcmp(&br->bridge_id, &br->designated_root, 8);
 147 }
 148
 149 /* br_device.c */
 150 extern void br_dev_setup(struct net_device *dev);
 151 extern netdev_tx_t br_dev_xmit(struct sk_buff *skb,
 152                                struct net_device *dev);
 153
 154 /* br_fdb.c */
 155 extern int br_fdb_init(void);
 156 extern void br_fdb_fini(void);
 157 extern void br_fdb_flush(struct net_bridge *br);
 158 extern void br_fdb_changeaddr(struct net_bridge_port *p,
 159                               const unsigned char *newaddr);
 160 extern void br_fdb_cleanup(unsigned long arg);
 161 extern void br_fdb_delete_by_port(struct net_bridge *br,
 162                                   const struct net_bridge_port *p, int do_all);
 163 extern struct net_bridge_fdb_entry *__br_fdb_get(struct net_bridge *br,
 164                                                  const unsigned char *addr);
 165 extern int br_fdb_test_addr(struct net_device *dev, unsigned char *addr);
 166 extern int br_fdb_fillbuf(struct net_bridge *br, void *buf,
 167                           unsigned long count, unsigned long off);
 168 extern int br_fdb_insert(struct net_bridge *br,
 169                          struct net_bridge_port *source,
 170                          const unsigned char *addr);
 171 extern void br_fdb_update(struct net_bridge *br,
 172                           struct net_bridge_port *source,
 173                           const unsigned char *addr);
 174
 175 /* br_forward.c */
 176 extern void br_deliver(const struct net_bridge_port *to,
 177                 struct sk_buff *skb);
 178 extern int br_dev_queue_push_xmit(struct sk_buff *skb);
 179 extern void br_forward(const struct net_bridge_port *to,
 180                 struct sk_buff *skb);
 181 extern int br_forward_finish(struct sk_buff *skb);
 182 extern void br_flood_deliver(struct net_bridge *br, struct sk_buff *skb);
 183 extern void br_flood_forward(struct net_bridge *br, struct sk_buff *skb,
 184                              struct sk_buff *skb2);
 185
 186 /* br_if.c */
 187 extern void br_port_carrier_check(struct net_bridge_port *p);
 188 extern int br_add_bridge(struct net *net, const char *name);
 189 extern int br_del_bridge(struct net *net, const char *name);
 190 extern void br_net_exit(struct net *net);
 191 extern int br_add_if(struct net_bridge *br,
 192               struct net_device *dev);
 193 extern int br_del_if(struct net_bridge *br,
 194               struct net_device *dev);
 195 extern int br_min_mtu(const struct net_bridge *br);
 196 extern void br_features_recompute(struct net_bridge *br);
 197
 198 /* br_input.c */
 199 extern int br_handle_frame_finish(struct sk_buff *skb);
 200 extern struct sk_buff *br_handle_frame(struct net_bridge_port *p,
 201                                        struct sk_buff *skb);
 202
 203 /* br_ioctl.c */
 204 extern int br_dev_ioctl(struct net_device *dev, struct ifreq *rq, int cmd);
 205 extern int br_ioctl_deviceless_stub(struct net *net, unsigned int cmd, void __user *arg);
 206
 207 /* br_netfilter.c */
 208 #ifdef CONFIG_BRIDGE_NETFILTER
 209 extern int br_netfilter_init(void);
 210 extern void br_netfilter_fini(void);
 211 extern void br_netfilter_rtable_init(struct net_bridge *);
 212 #else
 213 #define br_netfilter_init()     (0)
 214 #define br_netfilter_fini()     do { } while(0)
 215 #define br_netfilter_rtable_init(x)
 216 #endif
 217
 218 /* br_stp.c */
 219 extern void br_log_state(const struct net_bridge_port *p);
 220 extern struct net_bridge_port *br_get_port(struct net_bridge *br,
 221                                            u16 port_no);
 222 extern void br_init_port(struct net_bridge_port *p);
 223 extern void br_become_designated_port(struct net_bridge_port *p);
 224
 225 /* br_stp_if.c */
 226 extern void br_stp_enable_bridge(struct net_bridge *br);
 227 extern void br_stp_disable_bridge(struct net_bridge *br);
 228 extern void br_stp_set_enabled(struct net_bridge *br, unsigned long val);
 229 extern void br_stp_enable_port(struct net_bridge_port *p);
 230 extern void br_stp_disable_port(struct net_bridge_port *p);
 231 extern void br_stp_recalculate_bridge_id(struct net_bridge *br);
 232 extern void br_stp_change_bridge_id(struct net_bridge *br, const unsigned char *a);
 233 extern void br_stp_set_bridge_priority(struct net_bridge *br,
 234                                        u16 newprio);
 235 extern void br_stp_set_port_priority(struct net_bridge_port *p,
 236                                      u8 newprio);
 237 extern void br_stp_set_path_cost(struct net_bridge_port *p,
 238                                  u32 path_cost);
 239 extern ssize_t br_show_bridge_id(char *buf, const struct bridge_id *id);
 240
 241 /* br_stp_bpdu.c */
 242 struct stp_proto;
 243 extern void br_stp_rcv(const struct stp_proto *proto, struct sk_buff *skb,
 244                        struct net_device *dev);
 245
 246 /* br_stp_timer.c */
 247 extern void br_stp_timer_init(struct net_bridge *br);
 248 extern void br_stp_port_timer_init(struct net_bridge_port *p);
 249 extern unsigned long br_timer_value(const struct timer_list *timer);
 250
 251 /* br.c */
 252 #if defined(CONFIG_ATM_LANE) || defined(CONFIG_ATM_LANE_MODULE)
 253 extern int (*br_fdb_test_addr_hook)(struct net_device *dev, unsigned char *addr);
 254 #endif
 255
 256 /* br_netlink.c */
 257 extern int br_netlink_init(void);
 258 extern void br_netlink_fini(void);
 259 extern void br_ifinfo_notify(int event, struct net_bridge_port *port);
 260
 261 #ifdef CONFIG_SYSFS
 262 /* br_sysfs_if.c */
 263 extern struct sysfs_ops brport_sysfs_ops;
 264 extern int br_sysfs_addif(struct net_bridge_port *p);
 265
 266 /* br_sysfs_br.c */
 267 extern int br_sysfs_addbr(struct net_device *dev);
 268 extern void br_sysfs_delbr(struct net_device *dev);
 269
 270 #else
 271
 272 #define br_sysfs_addif(p)       (0)
 273 #define br_sysfs_addbr(dev)     (0)
 274 #define br_sysfs_delbr(dev)     do { } while(0)
 275 #endif /* CONFIG_SYSFS */
 276
 277 #endif