84 lines
1.5 KiB
C
84 lines
1.5 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Copyright (C) 2018 MediaTek Inc. All Rights Reserved.
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*
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* Author: Weijie Gao <weijie.gao@mediatek.com>
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*
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*/
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#ifndef __TCP_H__
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#define __TCP_H__
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#include <common.h>
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#include <net.h>
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#include <net/tcp.h>
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#define TCP_MSS 1440
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struct tcp_hdr {
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__be16 src;
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__be16 dst;
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__be32 seq;
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__be32 ack;
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__be16 flags;
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__be16 wnd;
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__be16 chksum;
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__be16 urg;
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};
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#define TCP_HDR_SIZE (sizeof(struct tcp_hdr))
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/* TCP flag bit */
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#define TCP_FIN BIT(0)
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#define TCP_SYN BIT(1)
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#define TCP_RST BIT(2)
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#define TCP_PSH BIT(3)
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#define TCP_ACK BIT(4)
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#define TCP_URG BIT(5)
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#define TCP_FLAG_MASK GENMASK(5, 0)
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#define TCP_HDR_LEN_MASK 0x0f
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#define TCP_HDR_LEN_SHIFT 12
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/* TCP option kind */
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#define TCP_OPT_EOL 0
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#define TCP_OPT_NOP 1
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#define TCP_OPT_MSS 2
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#define TCP_OPT_WS 3
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/* TCP RTT/RTO options */
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#define TCP_RTT_G 200
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#define TCP_RTT_K 4
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#define TCP_RTT_ALPHA 3
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#define TCP_RTT_BETA 2
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#define TCP_RTT_INTERVAL 3000
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/* TCP retransmission options */
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#define TCP_REXMIT_MAX_SEG_DELAY 60000
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#define TCP_REXMIT_MAX_CONN_DELAY 300000
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/* TCP state */
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enum tcp_state {
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INVALID_TCP_STATE = 0,
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LISTEN,
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SYN_SENT,
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SYN_RCVD,
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ESTABLISHED,
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FIN_WAIT_1,
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FIN_WAIT_2,
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CLOSE_WAIT,
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CLOSING,
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LAST_ACK,
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TIME_WAIT,
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CLOSED
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};
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/* Receive TCP packet */
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void receive_tcp(struct ip_hdr *ip, int len, struct ethernet_hdr *et);
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/* Called periodically to check the TCP status & send packets */
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void tcp_periodic_check(void);
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#endif /* __TCP_H__ */
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