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 <acme@conectiva.com.br> 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 */ 115