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	netdevice_tracker   dev_tracker;
42	u32		    copied_seq;		/* head of yet unread data */
43	u8		    retry_count;	/* number of retries */
44	u8		    ack_must_be_send;
45	u8		    first_pdu_Ns;
46	u8		    npta;
47	struct llc_timer    ack_timer;
48	struct llc_timer    pf_cycle_timer;
49	struct llc_timer    rej_sent_timer;
50	struct llc_timer    busy_state_timer;	/* ind busy clr at remote LLC */
51	u8		    vS;			/* seq# next in-seq I-PDU tx'd*/
52	u8		    vR;			/* seq# next in-seq I-PDU rx'd*/
53	u32		    n2;			/* max nbr re-tx's for timeout*/
54	u32		    n1;			/* max nbr octets in I PDU */
55	u8		    k;			/* tx window size; max = 127 */
56	u8		    rw;			/* rx window size; max = 127 */
57	u8		    p_flag;		/* state flags */
58	u8		    f_flag;
59	u8		    s_flag;
60	u8		    data_flag;
61	u8		    remote_busy_flag;
62	u8		    cause_flag;
63	struct sk_buff_head pdu_unack_q;	/* PUDs sent/waiting ack */
64	u16		    link;		/* network layer link number */
65	u8		    X;			/* a temporary variable */
66	u8		    ack_pf;		/* this flag indicates what is
67						   the P-bit of acknowledge */
68	u8		    failed_data_req; /* recognize that already exist a
69						failed llc_data_req_handler
70						(tx_buffer_full or unacceptable
71						state */
72	u8		    dec_step;
73	u8		    inc_cntr;
74	u8		    dec_cntr;
75	u8		    connect_step;
76	u8		    last_nr;	   /* NR of last pdu received */
77	u32		    rx_pdu_hdr;	   /* used for saving header of last pdu
78					      received and caused sending FRMR.
79					      Used for resending FRMR */
80	u32		    cmsg_flags;
81	struct hlist_node   dev_hash_node;
82};
83
84static inline struct llc_sock *llc_sk(const struct sock *sk)
85{
86	return (struct llc_sock *)sk;
87}
88
89static __inline__ void llc_set_backlog_type(struct sk_buff *skb, char type)
90{
91	skb->cb[sizeof(skb->cb) - 1] = type;
92}
93
94static __inline__ char llc_backlog_type(struct sk_buff *skb)
95{
96	return skb->cb[sizeof(skb->cb) - 1];
97}
98
99struct sock *llc_sk_alloc(struct net *net, int family, gfp_t priority,
100			  struct proto *prot, int kern);
101void llc_sk_stop_all_timers(struct sock *sk, bool sync);
102void llc_sk_free(struct sock *sk);
103
104void llc_sk_reset(struct sock *sk);
105
106/* Access to a connection */
107int llc_conn_state_process(struct sock *sk, struct sk_buff *skb);
108void llc_conn_send_pdu(struct sock *sk, struct sk_buff *skb);
109void llc_conn_rtn_pdu(struct sock *sk, struct sk_buff *skb);
110void llc_conn_resend_i_pdu_as_cmd(struct sock *sk, u8 nr, u8 first_p_bit);
111void llc_conn_resend_i_pdu_as_rsp(struct sock *sk, u8 nr, u8 first_f_bit);
112int llc_conn_remove_acked_pdus(struct sock *conn, u8 nr, u16 *how_many_unacked);
113struct sock *llc_lookup_established(struct llc_sap *sap, struct llc_addr *daddr,
114				    struct llc_addr *laddr, const struct net *net);
115void llc_sap_add_socket(struct llc_sap *sap, struct sock *sk);
116void llc_sap_remove_socket(struct llc_sap *sap, struct sock *sk);
117
118u8 llc_data_accept_state(u8 state);
119void llc_build_offset_table(void);
120#endif /* LLC_CONN_H */
121