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195 lines
5.4 KiB
195 lines
5.4 KiB
/* SPDX-License-Identifier: GPL-2.0-or-later */ |
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#ifndef _NET_DN_NSP_H |
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#define _NET_DN_NSP_H |
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/****************************************************************************** |
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(c) 1995-1998 E.M. Serrat [email protected] |
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*******************************************************************************/ |
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/* dn_nsp.c functions prototyping */ |
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void dn_nsp_send_data_ack(struct sock *sk); |
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void dn_nsp_send_oth_ack(struct sock *sk); |
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void dn_send_conn_ack(struct sock *sk); |
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void dn_send_conn_conf(struct sock *sk, gfp_t gfp); |
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void dn_nsp_send_disc(struct sock *sk, unsigned char type, |
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unsigned short reason, gfp_t gfp); |
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void dn_nsp_return_disc(struct sk_buff *skb, unsigned char type, |
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unsigned short reason); |
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void dn_nsp_send_link(struct sock *sk, unsigned char lsflags, char fcval); |
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void dn_nsp_send_conninit(struct sock *sk, unsigned char flags); |
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void dn_nsp_output(struct sock *sk); |
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int dn_nsp_check_xmit_queue(struct sock *sk, struct sk_buff *skb, |
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struct sk_buff_head *q, unsigned short acknum); |
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void dn_nsp_queue_xmit(struct sock *sk, struct sk_buff *skb, gfp_t gfp, |
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int oob); |
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unsigned long dn_nsp_persist(struct sock *sk); |
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int dn_nsp_xmit_timeout(struct sock *sk); |
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int dn_nsp_rx(struct sk_buff *); |
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int dn_nsp_backlog_rcv(struct sock *sk, struct sk_buff *skb); |
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struct sk_buff *dn_alloc_skb(struct sock *sk, int size, gfp_t pri); |
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struct sk_buff *dn_alloc_send_skb(struct sock *sk, size_t *size, int noblock, |
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long timeo, int *err); |
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#define NSP_REASON_OK 0 /* No error */ |
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#define NSP_REASON_NR 1 /* No resources */ |
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#define NSP_REASON_UN 2 /* Unrecognised node name */ |
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#define NSP_REASON_SD 3 /* Node shutting down */ |
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#define NSP_REASON_ID 4 /* Invalid destination end user */ |
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#define NSP_REASON_ER 5 /* End user lacks resources */ |
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#define NSP_REASON_OB 6 /* Object too busy */ |
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#define NSP_REASON_US 7 /* Unspecified error */ |
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#define NSP_REASON_TP 8 /* Third-Party abort */ |
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#define NSP_REASON_EA 9 /* End user has aborted the link */ |
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#define NSP_REASON_IF 10 /* Invalid node name format */ |
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#define NSP_REASON_LS 11 /* Local node shutdown */ |
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#define NSP_REASON_LL 32 /* Node lacks logical-link resources */ |
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#define NSP_REASON_LE 33 /* End user lacks logical-link resources */ |
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#define NSP_REASON_UR 34 /* Unacceptable RQSTRID or PASSWORD field */ |
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#define NSP_REASON_UA 36 /* Unacceptable ACCOUNT field */ |
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#define NSP_REASON_TM 38 /* End user timed out logical link */ |
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#define NSP_REASON_NU 39 /* Node unreachable */ |
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#define NSP_REASON_NL 41 /* No-link message */ |
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#define NSP_REASON_DC 42 /* Disconnect confirm */ |
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#define NSP_REASON_IO 43 /* Image data field overflow */ |
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#define NSP_DISCINIT 0x38 |
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#define NSP_DISCCONF 0x48 |
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/*------------------------- NSP - messages ------------------------------*/ |
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/* Data Messages */ |
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/*---------------*/ |
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/* Data Messages (data segment/interrupt/link service) */ |
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struct nsp_data_seg_msg { |
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__u8 msgflg; |
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__le16 dstaddr; |
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__le16 srcaddr; |
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} __packed; |
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struct nsp_data_opt_msg { |
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__le16 acknum; |
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__le16 segnum; |
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__le16 lsflgs; |
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} __packed; |
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struct nsp_data_opt_msg1 { |
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__le16 acknum; |
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__le16 segnum; |
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} __packed; |
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/* Acknowledgment Message (data/other data) */ |
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struct nsp_data_ack_msg { |
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__u8 msgflg; |
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__le16 dstaddr; |
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__le16 srcaddr; |
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__le16 acknum; |
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} __packed; |
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/* Connect Acknowledgment Message */ |
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struct nsp_conn_ack_msg { |
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__u8 msgflg; |
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__le16 dstaddr; |
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} __packed; |
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/* Connect Initiate/Retransmit Initiate/Connect Confirm */ |
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struct nsp_conn_init_msg { |
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__u8 msgflg; |
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#define NSP_CI 0x18 /* Connect Initiate */ |
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#define NSP_RCI 0x68 /* Retrans. Conn Init */ |
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__le16 dstaddr; |
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__le16 srcaddr; |
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__u8 services; |
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#define NSP_FC_NONE 0x00 /* Flow Control None */ |
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#define NSP_FC_SRC 0x04 /* Seg Req. Count */ |
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#define NSP_FC_SCMC 0x08 /* Sess. Control Mess */ |
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#define NSP_FC_MASK 0x0c /* FC type mask */ |
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__u8 info; |
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__le16 segsize; |
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} __packed; |
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/* Disconnect Initiate/Disconnect Confirm */ |
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struct nsp_disconn_init_msg { |
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__u8 msgflg; |
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__le16 dstaddr; |
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__le16 srcaddr; |
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__le16 reason; |
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} __packed; |
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struct srcobj_fmt { |
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__u8 format; |
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__u8 task; |
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__le16 grpcode; |
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__le16 usrcode; |
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__u8 dlen; |
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} __packed; |
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/* |
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* A collection of functions for manipulating the sequence |
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* numbers used in NSP. Similar in operation to the functions |
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* of the same name in TCP. |
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*/ |
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static __inline__ int dn_before(__u16 seq1, __u16 seq2) |
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{ |
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seq1 &= 0x0fff; |
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seq2 &= 0x0fff; |
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return (int)((seq1 - seq2) & 0x0fff) > 2048; |
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} |
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static __inline__ int dn_after(__u16 seq1, __u16 seq2) |
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{ |
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seq1 &= 0x0fff; |
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seq2 &= 0x0fff; |
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return (int)((seq2 - seq1) & 0x0fff) > 2048; |
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} |
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static __inline__ int dn_equal(__u16 seq1, __u16 seq2) |
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{ |
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return ((seq1 ^ seq2) & 0x0fff) == 0; |
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} |
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static __inline__ int dn_before_or_equal(__u16 seq1, __u16 seq2) |
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{ |
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return (dn_before(seq1, seq2) || dn_equal(seq1, seq2)); |
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} |
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static __inline__ void seq_add(__u16 *seq, __u16 off) |
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{ |
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(*seq) += off; |
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(*seq) &= 0x0fff; |
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} |
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static __inline__ int seq_next(__u16 seq1, __u16 seq2) |
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{ |
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return dn_equal(seq1 + 1, seq2); |
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} |
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/* |
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* Can we delay the ack ? |
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*/ |
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static __inline__ int sendack(__u16 seq) |
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{ |
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return (int)((seq & 0x1000) ? 0 : 1); |
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} |
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/* |
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* Is socket congested ? |
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*/ |
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static __inline__ int dn_congested(struct sock *sk) |
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{ |
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return atomic_read(&sk->sk_rmem_alloc) > (sk->sk_rcvbuf >> 1); |
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} |
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#define DN_MAX_NSP_DATA_HEADER (11) |
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#endif /* _NET_DN_NSP_H */
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