| xj | b04a402 | 2021-11-25 15:01:52 +0800 | [diff] [blame] | 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 */ |