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 LLC_P_TIME 2 23 #define LLC_ACK_TIME 1 24 #define LLC_REJ_TIME 3 25 #define LLC_BUSY_TIME 3 26 27 struct llc_timer { 28 struct timer_list timer; 29 u16 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 u8 retry_count; /* number of retries */ 42 u8 ack_must_be_send; 43 u8 first_pdu_Ns; 44 u8 npta; 45 struct llc_timer ack_timer; 46 struct llc_timer pf_cycle_timer; 47 struct llc_timer rej_sent_timer; 48 struct llc_timer busy_state_timer; /* ind busy clr at remote LLC */ 49 u8 vS; /* seq# next in-seq I-PDU tx'd*/ 50 u8 vR; /* seq# next in-seq I-PDU rx'd*/ 51 u32 n2; /* max nbr re-tx's for timeout*/ 52 u32 n1; /* max nbr octets in I PDU */ 53 u8 k; /* tx window size; max = 127 */ 54 u8 rw; /* rx window size; max = 127 */ 55 u8 p_flag; /* state flags */ 56 u8 f_flag; 57 u8 s_flag; 58 u8 data_flag; 59 u8 remote_busy_flag; 60 u8 cause_flag; 61 struct sk_buff_head pdu_unack_q; /* PUDs sent/waiting ack */ 62 u16 link; /* network layer link number */ 63 u8 X; /* a temporary variable */ 64 u8 ack_pf; /* this flag indicates what is 65 the P-bit of acknowledge */ 66 u8 failed_data_req; /* recognize that already exist a 67 failed llc_data_req_handler 68 (tx_buffer_full or unacceptable 69 state */ 70 u8 dec_step; 71 u8 inc_cntr; 72 u8 dec_cntr; 73 u8 connect_step; 74 u8 last_nr; /* NR of last pdu received */ 75 u32 rx_pdu_hdr; /* used for saving header of last pdu 76 received and caused sending FRMR. 77 Used for resending FRMR */ 78 }; 79 80 static inline struct llc_sock *llc_sk(const struct sock *sk) 81 { 82 return (struct llc_sock *)sk; 83 } 84 85 static __inline__ void llc_set_backlog_type(struct sk_buff *skb, char type) 86 { 87 skb->cb[sizeof(skb->cb) - 1] = type; 88 } 89 90 static __inline__ char llc_backlog_type(struct sk_buff *skb) 91 { 92 return skb->cb[sizeof(skb->cb) - 1]; 93 } 94 95 extern struct sock *llc_sk_alloc(int family, int priority, struct proto *prot); 96 extern void llc_sk_free(struct sock *sk); 97 98 extern void llc_sk_reset(struct sock *sk); 99 100 /* Access to a connection */ 101 extern int llc_conn_state_process(struct sock *sk, struct sk_buff *skb); 102 extern void llc_conn_send_pdu(struct sock *sk, struct sk_buff *skb); 103 extern void llc_conn_rtn_pdu(struct sock *sk, struct sk_buff *skb); 104 extern void llc_conn_resend_i_pdu_as_cmd(struct sock *sk, u8 nr, 105 u8 first_p_bit); 106 extern void llc_conn_resend_i_pdu_as_rsp(struct sock *sk, u8 nr, 107 u8 first_f_bit); 108 extern int llc_conn_remove_acked_pdus(struct sock *conn, u8 nr, 109 u16 *how_many_unacked); 110 extern struct sock *llc_lookup_established(struct llc_sap *sap, 111 struct llc_addr *daddr, 112 struct llc_addr *laddr); 113 extern void llc_sap_add_socket(struct llc_sap *sap, struct sock *sk); 114 extern void llc_sap_remove_socket(struct llc_sap *sap, struct sock *sk); 115 116 extern u8 llc_data_accept_state(u8 state); 117 extern void llc_build_offset_table(void); 118 extern int llc_release_sockets(struct llc_sap *sap); 119 #endif /* LLC_CONN_H */ 120