linux/include/net/llc_conn.h
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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
  27struct llc_timer {
  28        struct timer_list timer;
  29        unsigned long     expire;       /* timer expire time */
  30};
  31
  32struct 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        u32                 cmsg_flags;
  80        struct hlist_node   dev_hash_node;
  81};
  82
  83static inline struct llc_sock *llc_sk(const struct sock *sk)
  84{
  85        return (struct llc_sock *)sk;
  86}
  87
  88static __inline__ void llc_set_backlog_type(struct sk_buff *skb, char type)
  89{
  90        skb->cb[sizeof(skb->cb) - 1] = type;
  91}
  92
  93static __inline__ char llc_backlog_type(struct sk_buff *skb)
  94{
  95        return skb->cb[sizeof(skb->cb) - 1];
  96}
  97
  98extern struct sock *llc_sk_alloc(struct net *net, int family, gfp_t priority,
  99                                 struct proto *prot);
 100extern void llc_sk_free(struct sock *sk);
 101
 102extern void llc_sk_reset(struct sock *sk);
 103
 104/* Access to a connection */
 105extern int llc_conn_state_process(struct sock *sk, struct sk_buff *skb);
 106extern void llc_conn_send_pdu(struct sock *sk, struct sk_buff *skb);
 107extern void llc_conn_rtn_pdu(struct sock *sk, struct sk_buff *skb);
 108extern void llc_conn_resend_i_pdu_as_cmd(struct sock *sk, u8 nr,
 109                                         u8 first_p_bit);
 110extern void llc_conn_resend_i_pdu_as_rsp(struct sock *sk, u8 nr,
 111                                         u8 first_f_bit);
 112extern int llc_conn_remove_acked_pdus(struct sock *conn, u8 nr,
 113                                      u16 *how_many_unacked);
 114extern struct sock *llc_lookup_established(struct llc_sap *sap,
 115                                           struct llc_addr *daddr,
 116                                           struct llc_addr *laddr);
 117extern void llc_sap_add_socket(struct llc_sap *sap, struct sock *sk);
 118extern void llc_sap_remove_socket(struct llc_sap *sap, struct sock *sk);
 119
 120extern u8 llc_data_accept_state(u8 state);
 121extern void llc_build_offset_table(void);
 122#endif /* LLC_CONN_H */
 123
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