root/include/net/llc_conn.h

INCLUDED FROM

DEFINITIONS

1. llc_sk
2. llc_set_backlog_type
3. llc_backlog_type

#ifndef LLC_CONN_H
#define LLC_CONN_H
/*
 * Copyright (c) 1997 by Procom Technology, Inc.
 *               2001, 2002 by Arnaldo Carvalho de Melo <acme@conectiva.com.br>
 *
 * This program can be redistributed or modified under the terms of the
 * GNU General Public License as published by the Free Software Foundation.
 * This program is distributed without any warranty or implied warranty
 * of merchantability or fitness for a particular purpose.
 *
 * See the GNU General Public License for more details.
 */
#include <linux/timer.h>
#include <net/llc_if.h>
#include <net/sock.h>
#include <linux/llc.h>

#define LLC_EVENT                1
#define LLC_PACKET               2

#define LLC2_P_TIME               2
#define LLC2_ACK_TIME             1
#define LLC2_REJ_TIME             3
#define LLC2_BUSY_TIME            3

struct llc_timer {
        struct timer_list timer;
        unsigned long     expire;       /* timer expire time */
};

struct llc_sock {
        /* struct sock must be the first member of llc_sock */
        struct sock         sk;
        struct sockaddr_llc addr;               /* address sock is bound to */
        u8                  state;              /* state of connection */
        struct llc_sap      *sap;               /* pointer to parent SAP */
        struct llc_addr     laddr;              /* lsap/mac pair */
        struct llc_addr     daddr;              /* dsap/mac pair */
        struct net_device   *dev;               /* device to send to remote */
        u32                 copied_seq;         /* head of yet unread data */
        u8                  retry_count;        /* number of retries */
        u8                  ack_must_be_send;
        u8                  first_pdu_Ns;
        u8                  npta;
        struct llc_timer    ack_timer;
        struct llc_timer    pf_cycle_timer;
        struct llc_timer    rej_sent_timer;
        struct llc_timer    busy_state_timer;   /* ind busy clr at remote LLC */
        u8                  vS;                 /* seq# next in-seq I-PDU tx'd*/
        u8                  vR;                 /* seq# next in-seq I-PDU rx'd*/
        u32                 n2;                 /* max nbr re-tx's for timeout*/
        u32                 n1;                 /* max nbr octets in I PDU */
        u8                  k;                  /* tx window size; max = 127 */
        u8                  rw;                 /* rx window size; max = 127 */
        u8                  p_flag;             /* state flags */
        u8                  f_flag;
        u8                  s_flag;
        u8                  data_flag;
        u8                  remote_busy_flag;
        u8                  cause_flag;
        struct sk_buff_head pdu_unack_q;        /* PUDs sent/waiting ack */
        u16                 link;               /* network layer link number */
        u8                  X;                  /* a temporary variable */
        u8                  ack_pf;             /* this flag indicates what is
                                                   the P-bit of acknowledge */
        u8                  failed_data_req; /* recognize that already exist a
                                                failed llc_data_req_handler
                                                (tx_buffer_full or unacceptable
                                                state */
        u8                  dec_step;
        u8                  inc_cntr;
        u8                  dec_cntr;
        u8                  connect_step;
        u8                  last_nr;       /* NR of last pdu received */
        u32                 rx_pdu_hdr;    /* used for saving header of last pdu
                                              received and caused sending FRMR.
                                              Used for resending FRMR */
};

static inline struct llc_sock *llc_sk(const struct sock *sk)
{
        return (struct llc_sock *)sk;
}

static __inline__ void llc_set_backlog_type(struct sk_buff *skb, char type)
{
        skb->cb[sizeof(skb->cb) - 1] = type;
}

static __inline__ char llc_backlog_type(struct sk_buff *skb)
{
        return skb->cb[sizeof(skb->cb) - 1];
}

extern struct sock *llc_sk_alloc(struct net *net, int family, gfp_t priority,
                                 struct proto *prot);
extern void llc_sk_free(struct sock *sk);

extern void llc_sk_reset(struct sock *sk);

/* Access to a connection */
extern int llc_conn_state_process(struct sock *sk, struct sk_buff *skb);
extern void llc_conn_send_pdu(struct sock *sk, struct sk_buff *skb);
extern void llc_conn_rtn_pdu(struct sock *sk, struct sk_buff *skb);
extern void llc_conn_resend_i_pdu_as_cmd(struct sock *sk, u8 nr,
                                         u8 first_p_bit);
extern void llc_conn_resend_i_pdu_as_rsp(struct sock *sk, u8 nr,
                                         u8 first_f_bit);
extern int llc_conn_remove_acked_pdus(struct sock *conn, u8 nr,
                                      u16 *how_many_unacked);
extern struct sock *llc_lookup_established(struct llc_sap *sap,
                                           struct llc_addr *daddr,
                                           struct llc_addr *laddr);
extern void llc_sap_add_socket(struct llc_sap *sap, struct sock *sk);
extern void llc_sap_remove_socket(struct llc_sap *sap, struct sock *sk);

extern u8 llc_data_accept_state(u8 state);
extern void llc_build_offset_table(void);
#endif /* LLC_CONN_H */