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

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