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/*

 * Constants and structure definitions for the bridging code

 */

#if !defined(One)

#define Zero    0

#define One     1

#endif  /* !defined(One) */

#if !defined(TRUE)

#define FALSE   0

#define TRUE    1

#endif /* !defined(TRUE) */

/** port states. **/

#define Disabled        0                          /* (4.4 5)     */

#define Listening       1                         /* (4.4.2)     */

#define Learning        2                         /* (4.4.3)     */

#define Forwarding      3                         /* (4 4 4)     */

#define Blocking        4                         /* (4.4.1)     */

#define No_of_ports 8

/* arbitrary choice, to allow the code below to compile */

#define All_ports (No_of_ports + 1)

/*

 * We time out our entries in the FDB after this many seconds.

 */

#define FDB_TIMEOUT     300

/*

 * the following defines are the initial values used when the

 * bridge is booted.  These may be overridden when this bridge is

 * not the root bridge.  These are the recommended default values

 * from the 802.1d specification.

 */

#define BRIDGE_MAX_AGE          20

#define BRIDGE_HELLO_TIME       2

#define BRIDGE_FORWARD_DELAY    15

#define HOLD_TIME               1

#define Default_path_cost 10

/*

 * minimum increment possible to avoid underestimating age, allows for BPDU

 * transmission time

 */

#define Message_age_increment 1

#define No_port 0

/*

 * reserved value for Bridge's root port parameter indicating no root port,

 * used when Bridge is the root - also used to indicate the source when

 * a frame is being generated by a higher layer protocol on this host

 */

/** Configuration BPDU Parameters (4.5.1) **/

typedef struct {

        union {

                struct {

                        unsigned short priority;

                        unsigned char ula[6];

                } p_u;

                unsigned int id[2];

        } bi;

} bridge_id_t;

#define BRIDGE_PRIORITY bi.p_u.priority

#define BRIDGE_ID_ULA   bi.p_u.ula

#define BRIDGE_ID       bi.id

typedef struct {

        unsigned short  protocol_id;

        unsigned char   protocol_version_id;

        unsigned char   type;

        unsigned char   flags;

#define TOPOLOGY_CHANGE         0x01

#define TOPOLOGY_CHANGE_ACK     0x80

        bridge_id_t      root_id;                 /* (4.5.1.1)   */

        unsigned int     root_path_cost;          /* (4.5.1.2)   */

        bridge_id_t      bridge_id;               /* (4.5.1.3)   */

        unsigned short   port_id;                 /* (4.5.1.4)   */

        unsigned short   message_age;             /* (4.5.1.5)   */

        unsigned short   max_age;                 /* (4.5.1.6)   */

        unsigned short   hello_time;              /* (4.5.1.7)   */

        unsigned short   forward_delay;           /* (4.5.1.8)   */

} Config_bpdu;

/** Topology Change Notification BPDU Parameters (4.5.2) **/

typedef struct {

        unsigned short  protocol_id;

        unsigned char   protocol_version_id;

        unsigned char   type;

} Tcn_bpdu;

#define BPDU_TYPE_CONFIG        0

#define BPDU_TYPE_TOPO_CHANGE   128

/** Bridge Parameters (4.5.3) **/

typedef struct {

        bridge_id_t      designated_root;         /* (4.5.3.1)   */

        unsigned int     root_path_cost;          /* (4.5.3.2)   */

        unsigned int     root_port;               /* (4.5.3.3)   */

        unsigned short   max_age;                 /* (4.5.3.4)   */

        unsigned short   hello_time;              /* (4.5.3.5)   */

        unsigned short   forward_delay;           /* (4.5.3.6)   */

        bridge_id_t      bridge_id;               /* (4.5.3.7)   */

        unsigned short   bridge_max_age;          /* (4.5.3.8)   */

        unsigned short   bridge_hello_time;       /* (4.5.3.9)   */

        unsigned short   bridge_forward_delay;    /* (4.5.3.10)  */

        unsigned int     topology_change_detected; /* (4.5.3.11) */

        unsigned int     topology_change;         /* (4.5.3.12)  */

        unsigned short   topology_change_time;    /* (4.5.3.13)  */

        unsigned short   hold_time;               /* (4.5.3.14)  */

        unsigned int     top_change;

        unsigned int     top_change_detected;

} Bridge_data;

/** Port Parameters (4.5.5) **/

typedef struct {

        unsigned short   port_id;                 /* (4.5.5.1)   */

        unsigned int     state;                   /* (4.5.5.2)   */

        unsigned int     path_cost;               /* (4.5.5.3)   */

        bridge_id_t      designated_root;         /* (4.5.5.4)   */

        unsigned int     designated_cost;         /* (4.5.5.5)   */

        bridge_id_t      designated_bridge;       /* (4.5.5.6)   */

        unsigned short   designated_port;         /* (4.5.5.7)   */

        unsigned int     top_change_ack;          /* (4.5.5.8)   */

        unsigned int     config_pending;          /* (4.5.5.9)   */

        struct device *dev;

        struct fdb *fdb;        /* head of per port fdb chain */

} Port_data;

/** types to support timers for this pseudo-implementation. **/

typedef struct {

        unsigned int     active;                          /* timer in use. */

        unsigned int     value;                   /* current value of timer,

                                                   * counting up. */

} Timer;

struct fdb {

        unsigned char ula[6];

        unsigned char pad[2];

        unsigned short port;

        unsigned int timer;

        unsigned int flags;

#define FDB_ENT_VALID   0x01

/* AVL tree of all addresses, sorted by address */

        short fdb_avl_height;

        struct fdb *fdb_avl_left;

        struct fdb *fdb_avl_right;

/* linked list of addresses for each port */

        struct fdb *fdb_next;

};

#define IS_BRIDGED      0x2e

struct br_stat {

        unsigned int flags;

        Bridge_data bridge_data;

        Port_data port_data[No_of_ports];

};

/* defined flags for br_stat.flags */

#define BR_UP           0x0001  /* bridging enabled */

#define BR_DEBUG        0x0002  /* debugging enabled */

struct br_cf {

        unsigned int cmd;

        unsigned int arg1;

        unsigned int arg2;

};

/* defined cmds */

#define BRCMD_BRIDGE_ENABLE     1

#define BRCMD_BRIDGE_DISABLE    2

#define BRCMD_PORT_ENABLE       3       /* arg1 = port */

#define BRCMD_PORT_DISABLE      4       /* arg1 = port */

#define BRCMD_SET_BRIDGE_PRIORITY       5       /* arg1 = priority */

#define BRCMD_SET_PORT_PRIORITY 6       /* arg1 = port, arg2 = priority */

#define BRCMD_SET_PATH_COST     7       /* arg1 = port, arg2 = cost */

#define BRCMD_DISPLAY_FDB       8       /* arg1 = port */

#define BRCMD_ENABLE_DEBUG      9

#define BRCMD_DISABLE_DEBUG     10

/* prototypes of all bridging functions... */

void transmit_config(int port_no);

int root_bridge(void);

int supersedes_port_info(int port_no, Config_bpdu *config);

void record_config_information(int port_no, Config_bpdu *config);

void record_config_timeout_values(Config_bpdu *config);

void config_bpdu_generation(void);

int designated_port(int port_no);

void reply(int port_no);

void transmit_tcn(void);

void configuration_update(void);

void root_selection(void);

void designated_port_selection(void);

void become_designated_port(int port_no);

void port_state_selection(void);

void make_forwarding(int port_no);

void topology_change_detection(void);

void topology_change_acknowledged(void);

void acknowledge_topology_change(int port_no);

void make_blocking(int port_no);

void set_port_state(int port_no, int state);

void received_config_bpdu(int port_no, Config_bpdu *config);

void received_tcn_bpdu(int port_no, Tcn_bpdu *tcn);

void hello_timer_expiry(void);

void message_age_timer_expiry(int port_no);

void forward_delay_timer_expiry(int port_no);

int designated_for_some_port(void);

void tcn_timer_expiry(void);

void topology_change_timer_expiry(void);

void hold_timer_expiry(int port_no);

void br_init(void);

void br_init_port(int port_no);

void enable_port(int port_no);

void disable_port(int port_no);

void set_bridge_priority(bridge_id_t *new_bridge_id);

void set_port_priority(int port_no, unsigned short new_port_id);

void set_path_cost(int port_no, unsigned short path_cost);

void start_hello_timer(void);

void stop_hello_timer(void);

int hello_timer_expired(void);

void start_tcn_timer(void);

void stop_tcn_timer(void);

int tcn_timer_expired(void);

void start_topology_change_timer(void);

void stop_topology_change_timer(void);

int topology_change_timer_expired(void);

void start_message_age_timer(int port_no, unsigned short message_age);

void stop_message_age_timer(int port_no);

int message_age_timer_expired(int port_no);

void start_forward_delay_timer(int port_no);

void stop_forward_delay_timer(int port_no);

int forward_delay_timer_expired(int port_no);

void start_hold_timer(int port_no);

void stop_hold_timer(int port_no);

int hold_timer_expired(int port_no);

struct fdb *br_avl_find_addr(unsigned char addr[6]);

int br_avl_insert (struct fdb * new_node);

int br_avl_remove (struct fdb * node_to_delete);

int send_tcn_bpdu(int port_no, Tcn_bpdu *bpdu);

int send_config_bpdu(int port_no, Config_bpdu *config_bpdu);

int find_port(struct device *dev);

int br_flood(struct sk_buff *skb, int port);

int br_drop(struct sk_buff *skb);

int br_learn(struct sk_buff *skb, int port);    /* 3.8 */

int br_receive_frame(struct sk_buff *skb);      /* 3.5 */

int br_tx_frame(struct sk_buff *skb);

int br_ioctl(unsigned int cmd, void *arg);

void free_fdb(struct fdb *);

struct fdb *get_fdb(void);

/* externs */

extern struct br_stat br_stats;