linux - include/net/llc

114 lines · 3.8 KiB

1	/* SPDX-License-Identifier: GPL-2.0 */
2	#ifndef LLC_CONN_H
3	#define LLC_CONN_H
4	/*
5	* Copyright (c) 1997 by Procom Technology, Inc.
6	* 2001, 2002 by Arnaldo Carvalho de Melo <[email protected]>
7	*/
8	#include <linux/timer.h>
9	#include <net/llc_if.h>
10	#include <net/sock.h>
11	#include <linux/llc.h>
12
13	#define LLC_EVENT 1
14	#define LLC_PACKET 2
15
16	#define LLC2_P_TIME 2
17	#define LLC2_ACK_TIME 1
18	#define LLC2_REJ_TIME 3
19	#define LLC2_BUSY_TIME 3
20
21	struct llc_timer {
22	struct timer_list timer;
23	unsigned long expire; /* timer expire time */
24	};
25
26	struct llc_sock {
27	/* struct sock must be the first member of llc_sock */
28	struct sock sk;
29	struct sockaddr_llc addr; /* address sock is bound to */
30	u8 state; /* state of connection */
31	struct llc_sap sap; / pointer to parent SAP */
32	struct llc_addr laddr; /* lsap/mac pair */
33	struct llc_addr daddr; /* dsap/mac pair */
34	struct net_device dev; / device to send to remote */
35	netdevice_tracker dev_tracker;
36	u32 copied_seq; /* head of yet unread data */
37	u8 retry_count; /* number of retries */
38	u8 ack_must_be_send;
39	u8 first_pdu_Ns;
40	u8 npta;
41	struct llc_timer ack_timer;
42	struct llc_timer pf_cycle_timer;
43	struct llc_timer rej_sent_timer;
44	struct llc_timer busy_state_timer; /* ind busy clr at remote LLC */
45	u8 vS; /* seq# next in-seq I-PDU tx'd*/
46	u8 vR; /* seq# next in-seq I-PDU rx'd*/
47	u32 n2; /* max nbr re-tx's for timeout*/
48	u32 n1; /* max nbr octets in I PDU */
49	u8 k; /* tx window size; max = 127 */
50	u8 rw; /* rx window size; max = 127 */
51	u8 p_flag; /* state flags */
52	u8 f_flag;
53	u8 s_flag;
54	u8 data_flag;
55	u8 remote_busy_flag;
56	u8 cause_flag;
57	struct sk_buff_head pdu_unack_q; /* PUDs sent/waiting ack */
58	u16 link; /* network layer link number */
59	u8 X; /* a temporary variable */
60	u8 ack_pf; /* this flag indicates what is
61	the P-bit of acknowledge */
62	u8 failed_data_req; /* recognize that already exist a
63	failed llc_data_req_handler
64	(tx_buffer_full or unacceptable
65	state */
66	u8 dec_step;
67	u8 inc_cntr;
68	u8 dec_cntr;
69	u8 connect_step;
70	u8 last_nr; /* NR of last pdu received */
71	u32 rx_pdu_hdr; /* used for saving header of last pdu
72	received and caused sending FRMR.
73	Used for resending FRMR */
74	u32 cmsg_flags;
75	struct hlist_node dev_hash_node;
76	};
77
78	static inline struct llc_sock llc_sk(const struct sock sk)
79	{
80	return (struct llc_sock *)sk;
81	}
82
83	static __inline__ void llc_set_backlog_type(struct sk_buff *skb, char type)
84	{
85	skb->cb[sizeof(skb->cb) - 1] = type;
86	}
87
88	static __inline__ char llc_backlog_type(struct sk_buff *skb)
89	{
90	return skb->cb[sizeof(skb->cb) - 1];
91	}
92
93	struct sock llc_sk_alloc(struct net net, int family, gfp_t priority,
94	struct proto *prot, int kern);
95	void llc_sk_stop_all_timers(struct sock *sk, bool sync);
96	void llc_sk_free(struct sock *sk);
97
98	void llc_sk_reset(struct sock *sk);
99
100	/* Access to a connection */
101	int llc_conn_state_process(struct sock sk, struct sk_buff skb);
102	void llc_conn_send_pdu(struct sock sk, struct sk_buff skb);
103	void llc_conn_rtn_pdu(struct sock sk, struct sk_buff skb);
104	void llc_conn_resend_i_pdu_as_cmd(struct sock *sk, u8 nr, u8 first_p_bit);
105	void llc_conn_resend_i_pdu_as_rsp(struct sock *sk, u8 nr, u8 first_f_bit);
106	int llc_conn_remove_acked_pdus(struct sock conn, u8 nr, u16 how_many_unacked);
107	struct sock llc_lookup_established(struct llc_sap sap, struct llc_addr *daddr,
108	struct llc_addr laddr, const struct net net);
109	void llc_sap_add_socket(struct llc_sap sap, struct sock sk);
110	void llc_sap_remove_socket(struct llc_sap sap, struct sock sk);
111
112	u8 llc_data_accept_state(u8 state);
113	void llc_build_offset_table(void);
114	#endif /* LLC_CONN_H */