include/net/llc_conn.h

   1 #ifndef LLC_CONN_H
   2 #define LLC_CONN_H
   3 /*
   4  * Copyright (c) 1997 by Procom Technology, Inc.
   5  *               2001, 2002 by Arnaldo Carvalho de Melo <acme@conectiva.com.br>
   6  *
   7  * This program can be redistributed or modified under the terms of the
   8  * GNU General Public License as published by the Free Software Foundation.
   9  * This program is distributed without any warranty or implied warranty
  10  * of merchantability or fitness for a particular purpose.
  11  *
  12  * See the GNU General Public License for more details.
  13  */
  14 #include <linux/timer.h>
  15 #include <net/llc_if.h>
  16 #include <linux/llc.h>
  17
  18 #define LLC_EVENT                1
  19 #define LLC_PACKET               2
  20
  21 #define LLC_P_TIME               2
  22 #define LLC_ACK_TIME             1
  23 #define LLC_REJ_TIME             3
  24 #define LLC_BUSY_TIME            3
  25
  26 struct llc_timer {
  27         struct timer_list timer;
  28         u16               expire;       /* timer expire time */
  29 };
  30
  31 struct llc_opt {
  32         struct sock         *sk;                /* sock that has this llc_opt */
  33         struct sockaddr_llc addr;               /* address sock is bound to */
  34         u8                  state;              /* state of connection */
  35         struct llc_sap      *sap;               /* pointer to parent SAP */
  36         struct llc_addr     laddr;              /* lsap/mac pair */
  37         struct llc_addr     daddr;              /* dsap/mac pair */
  38         struct net_device   *dev;               /* device to send to remote */
  39         u8                  retry_count;        /* number of retries */
  40         u8                  ack_must_be_send;
  41         u8                  first_pdu_Ns;
  42         u8                  npta;
  43         struct llc_timer    ack_timer;
  44         struct llc_timer    pf_cycle_timer;
  45         struct llc_timer    rej_sent_timer;
  46         struct llc_timer    busy_state_timer;   /* ind busy clr at remote LLC */
  47         u8                  vS;                 /* seq# next in-seq I-PDU tx'd*/
  48         u8                  vR;                 /* seq# next in-seq I-PDU rx'd*/
  49         u32                 n2;                 /* max nbr re-tx's for timeout*/
  50         u32                 n1;                 /* max nbr octets in I PDU */
  51         u8                  k;                  /* tx window size; max = 127 */
  52         u8                  rw;                 /* rx window size; max = 127 */
  53         u8                  p_flag;             /* state flags */
  54         u8                  f_flag;
  55         u8                  s_flag;
  56         u8                  data_flag;
  57         u8                  remote_busy_flag;
  58         u8                  cause_flag;
  59         struct sk_buff_head pdu_unack_q;        /* PUDs sent/waiting ack */
  60         u16                 link;               /* network layer link number */
  61         u8                  X;                  /* a temporary variable */
  62         u8                  ack_pf;             /* this flag indicates what is
  63                                                    the P-bit of acknowledge */
  64         u8                  failed_data_req; /* recognize that already exist a
  65                                                 failed llc_data_req_handler
  66                                                 (tx_buffer_full or unacceptable
  67                                                 state */
  68         u8                  dec_step;
  69         u8                  inc_cntr;
  70         u8                  dec_cntr;
  71         u8                  connect_step;
  72         u8                  last_nr;       /* NR of last pdu received */
  73         u32                 rx_pdu_hdr;    /* used for saving header of last pdu
  74                                               received and caused sending FRMR.
  75                                               Used for resending FRMR */
  76 };
  77
  78 #define llc_sk(__sk) ((struct llc_opt *)(__sk)->sk_protinfo)
  79
  80 static __inline__ void llc_set_backlog_type(struct sk_buff *skb, char type)
  81 {
  82         skb->cb[sizeof(skb->cb) - 1] = type;
  83 }
  84
  85 static __inline__ char llc_backlog_type(struct sk_buff *skb)
  86 {
  87         return skb->cb[sizeof(skb->cb) - 1];
  88 }
  89
  90 extern struct sock *llc_sk_alloc(int family, int priority);
  91 extern void llc_sk_free(struct sock *sk);
  92
  93 extern void llc_sk_reset(struct sock *sk);
  94 extern int llc_sk_init(struct sock *sk);
  95
  96 /* Access to a connection */
  97 extern int llc_conn_state_process(struct sock *sk, struct sk_buff *skb);
  98 extern void llc_conn_send_pdu(struct sock *sk, struct sk_buff *skb);
  99 extern void llc_conn_rtn_pdu(struct sock *sk, struct sk_buff *skb);
 100 extern void llc_conn_resend_i_pdu_as_cmd(struct sock *sk, u8 nr,
 101                                          u8 first_p_bit);
 102 extern void llc_conn_resend_i_pdu_as_rsp(struct sock *sk, u8 nr,
 103                                          u8 first_f_bit);
 104 extern int llc_conn_remove_acked_pdus(struct sock *conn, u8 nr,
 105                                       u16 *how_many_unacked);
 106 extern struct sock *llc_lookup_established(struct llc_sap *sap,
 107                                            struct llc_addr *daddr,
 108                                            struct llc_addr *laddr);
 109 extern struct sock *llc_lookup_listener(struct llc_sap *sap,
 110                                         struct llc_addr *laddr);
 111 extern void llc_sap_add_socket(struct llc_sap *sap, struct sock *sk);
 112 extern void llc_sap_remove_socket(struct llc_sap *sap, struct sock *sk);
 113
 114 extern u8 llc_data_accept_state(u8 state);
 115 extern void llc_build_offset_table(void);
 116 extern int llc_release_sockets(struct llc_sap *sap);
 117 #endif /* LLC_CONN_H */