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   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 <net/sock.h>
  17 #include <linux/llc.h>
  18
  19 #define LLC_EVENT                1
  20 #define LLC_PACKET               2
  21
  22 #define LLC2_P_TIME               2
  23 #define LLC2_ACK_TIME             1
  24 #define LLC2_REJ_TIME             3
  25 #define LLC2_BUSY_TIME            3
  26
  27 struct llc_timer {
  28         struct timer_list timer;
  29         unsigned long     expire;       /* timer expire time */
  30 };
  31
  32 struct llc_sock {
  33         /* struct sock must be the first member of llc_sock */
  34         struct sock         sk;
  35         struct sockaddr_llc addr;               /* address sock is bound to */
  36         u8                  state;              /* state of connection */
  37         struct llc_sap      *sap;               /* pointer to parent SAP */
  38         struct llc_addr     laddr;              /* lsap/mac pair */
  39         struct llc_addr     daddr;              /* dsap/mac pair */
  40         struct net_device   *dev;               /* device to send to remote */
  41         u32                 copied_seq;         /* head of yet unread data */
  42         u8                  retry_count;        /* number of retries */
  43         u8                  ack_must_be_send;
  44         u8                  first_pdu_Ns;
  45         u8                  npta;
  46         struct llc_timer    ack_timer;
  47         struct llc_timer    pf_cycle_timer;
  48         struct llc_timer    rej_sent_timer;
  49         struct llc_timer    busy_state_timer;   /* ind busy clr at remote LLC */
  50         u8                  vS;                 /* seq# next in-seq I-PDU tx'd*/
  51         u8                  vR;                 /* seq# next in-seq I-PDU rx'd*/
  52         u32                 n2;                 /* max nbr re-tx's for timeout*/
  53         u32                 n1;                 /* max nbr octets in I PDU */
  54         u8                  k;                  /* tx window size; max = 127 */
  55         u8                  rw;                 /* rx window size; max = 127 */
  56         u8                  p_flag;             /* state flags */
  57         u8                  f_flag;
  58         u8                  s_flag;
  59         u8                  data_flag;
  60         u8                  remote_busy_flag;
  61         u8                  cause_flag;
  62         struct sk_buff_head pdu_unack_q;        /* PUDs sent/waiting ack */
  63         u16                 link;               /* network layer link number */
  64         u8                  X;                  /* a temporary variable */
  65         u8                  ack_pf;             /* this flag indicates what is
  66                                                    the P-bit of acknowledge */
  67         u8                  failed_data_req; /* recognize that already exist a
  68                                                 failed llc_data_req_handler
  69                                                 (tx_buffer_full or unacceptable
  70                                                 state */
  71         u8                  dec_step;
  72         u8                  inc_cntr;
  73         u8                  dec_cntr;
  74         u8                  connect_step;
  75         u8                  last_nr;       /* NR of last pdu received */
  76         u32                 rx_pdu_hdr;    /* used for saving header of last pdu
  77                                               received and caused sending FRMR.
  78                                               Used for resending FRMR */
  79 };
  80
  81 static inline struct llc_sock *llc_sk(const struct sock *sk)
  82 {
  83         return (struct llc_sock *)sk;
  84 }
  85
  86 static __inline__ void llc_set_backlog_type(struct sk_buff *skb, char type)
  87 {
  88         skb->cb[sizeof(skb->cb) - 1] = type;
  89 }
  90
  91 static __inline__ char llc_backlog_type(struct sk_buff *skb)
  92 {
  93         return skb->cb[sizeof(skb->cb) - 1];
  94 }
  95
  96 extern struct sock *llc_sk_alloc(struct net *net, int family, gfp_t priority,
  97                                  struct proto *prot);
  98 extern void llc_sk_free(struct sock *sk);
  99
 100 extern void llc_sk_reset(struct sock *sk);
 101
 102 /* Access to a connection */
 103 extern int llc_conn_state_process(struct sock *sk, struct sk_buff *skb);
 104 extern void llc_conn_send_pdu(struct sock *sk, struct sk_buff *skb);
 105 extern void llc_conn_rtn_pdu(struct sock *sk, struct sk_buff *skb);
 106 extern void llc_conn_resend_i_pdu_as_cmd(struct sock *sk, u8 nr,
 107                                          u8 first_p_bit);
 108 extern void llc_conn_resend_i_pdu_as_rsp(struct sock *sk, u8 nr,
 109                                          u8 first_f_bit);
 110 extern int llc_conn_remove_acked_pdus(struct sock *conn, u8 nr,
 111                                       u16 *how_many_unacked);
 112 extern struct sock *llc_lookup_established(struct llc_sap *sap,
 113                                            struct llc_addr *daddr,
 114                                            struct llc_addr *laddr);
 115 extern void llc_sap_add_socket(struct llc_sap *sap, struct sock *sk);
 116 extern void llc_sap_remove_socket(struct llc_sap *sap, struct sock *sk);
 117
 118 extern u8 llc_data_accept_state(u8 state);
 119 extern void llc_build_offset_table(void);
 120 #endif /* LLC_CONN_H */