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_stop_all_timers(struct sock *sk, bool sync);
101 void llc_sk_free(struct sock *sk);
102
103 void llc_sk_reset(struct sock *sk);
104
105 /* Access to a connection */
106 int llc_conn_state_process(struct sock *sk, struct sk_buff *skb);
107 void llc_conn_send_pdu(struct sock *sk, struct sk_buff *skb);
108 void llc_conn_rtn_pdu(struct sock *sk, struct sk_buff *skb);
109 void llc_conn_resend_i_pdu_as_cmd(struct sock *sk, u8 nr, u8 first_p_bit);
110 void llc_conn_resend_i_pdu_as_rsp(struct sock *sk, u8 nr, u8 first_f_bit);
111 int llc_conn_remove_acked_pdus(struct sock *conn, u8 nr, u16 *how_many_unacked);
112 struct sock *llc_lookup_established(struct llc_sap *sap, struct llc_addr *daddr,
113 struct llc_addr *laddr);
114 void llc_sap_add_socket(struct llc_sap *sap, struct sock *sk);
115 void llc_sap_remove_socket(struct llc_sap *sap, struct sock *sk);
116
117 u8 llc_data_accept_state(u8 state);
118 void llc_build_offset_table(void);
119 #endif /* LLC_CONN_H */