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 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 84 static inline struct llc_sock *llc_sk(const struct sock *sk) 85 { 86 return (struct llc_sock *)sk; 87 } 88 89 static __inline__ void llc_set_backlog_type(struct sk_buff *skb, char type) 90 { 91 skb->cb[sizeof(skb->cb) - 1] = type; 92 } 93 94 static __inline__ char llc_backlog_type(struct sk_buff *skb) 95 { 96 return skb->cb[sizeof(skb->cb) - 1]; 97 } 98 99 struct sock *llc_sk_alloc(struct net *net, int family, gfp_t priority, 100 struct proto *prot, int kern); 101 void llc_sk_stop_all_timers(struct sock *sk, bool sync); 102 void llc_sk_free(struct sock *sk); 103 104 void llc_sk_reset(struct sock *sk); 105 106 /* Access to a connection */ 107 int llc_conn_state_process(struct sock *sk, struct sk_buff *skb); 108 void llc_conn_send_pdu(struct sock *sk, struct sk_buff *skb); 109 void llc_conn_rtn_pdu(struct sock *sk, struct sk_buff *skb); 110 void llc_conn_resend_i_pdu_as_cmd(struct sock *sk, u8 nr, u8 first_p_bit); 111 void llc_conn_resend_i_pdu_as_rsp(struct sock *sk, u8 nr, u8 first_f_bit); 112 int llc_conn_remove_acked_pdus(struct sock *conn, u8 nr, u16 *how_many_unacked); 113 struct sock *llc_lookup_established(struct llc_sap *sap, struct llc_addr *daddr, 114 struct llc_addr *laddr); 115 void llc_sap_add_socket(struct llc_sap *sap, struct sock *sk); 116 void llc_sap_remove_socket(struct llc_sap *sap, struct sock *sk); 117 118 u8 llc_data_accept_state(u8 state); 119 void llc_build_offset_table(void); 120 #endif /* LLC_CONN_H */ 121