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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 <[email protected]>
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 extern struct sock *llc_sk_alloc(struct net *net, int family, gfp_t priority,
99  struct proto *prot);
100 extern void llc_sk_free(struct sock *sk);
101 
102 extern void llc_sk_reset(struct sock *sk);
103 
104 /* Access to a connection */
105 extern int llc_conn_state_process(struct sock *sk, struct sk_buff *skb);
106 extern void llc_conn_send_pdu(struct sock *sk, struct sk_buff *skb);
107 extern void llc_conn_rtn_pdu(struct sock *sk, struct sk_buff *skb);
108 extern void llc_conn_resend_i_pdu_as_cmd(struct sock *sk, u8 nr,
109  u8 first_p_bit);
110 extern void llc_conn_resend_i_pdu_as_rsp(struct sock *sk, u8 nr,
111  u8 first_f_bit);
112 extern int llc_conn_remove_acked_pdus(struct sock *conn, u8 nr,
113  u16 *how_many_unacked);
114 extern struct sock *llc_lookup_established(struct llc_sap *sap,
115  struct llc_addr *daddr,
116  struct llc_addr *laddr);
117 extern void llc_sap_add_socket(struct llc_sap *sap, struct sock *sk);
118 extern void llc_sap_remove_socket(struct llc_sap *sap, struct sock *sk);
119 
120 extern u8 llc_data_accept_state(u8 state);
121 extern void llc_build_offset_table(void);
122 #endif /* LLC_CONN_H */
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