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/* *********************************************************************
* Broadcom Common Firmware Environment (CFE)
*
* TCP Protocol Internal Definitions File: net_tcp_internal.h
*
* This file contains the structures and constants needed to
* maintain TCP connections.
*
* Author: Mitch Lichtenberg (mpl@broadcom.com)
*
*********************************************************************
*
* Copyright 2000,2001,2002,2003
* Broadcom Corporation. All rights reserved.
*
* This software is furnished under license and may be used and
* copied only in accordance with the following terms and
* conditions. Subject to these conditions, you may download,
* copy, install, use, modify and distribute modified or unmodified
* copies of this software in source and/or binary form. No title
* or ownership is transferred hereby.
*
* 1) Any source code used, modified or distributed must reproduce
* and retain this copyright notice and list of conditions
* as they appear in the source file.
*
* 2) No right is granted to use any trade name, trademark, or
* logo of Broadcom Corporation. The "Broadcom Corporation"
* name may not be used to endorse or promote products derived
* from this software without the prior written permission of
* Broadcom Corporation.
*
* 3) THIS SOFTWARE IS PROVIDED "AS-IS" AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING BUT NOT LIMITED TO, ANY IMPLIED
* WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR
* PURPOSE, OR NON-INFRINGEMENT ARE DISCLAIMED. IN NO EVENT
* SHALL BROADCOM BE LIABLE FOR ANY DAMAGES WHATSOEVER, AND IN
* PARTICULAR, BROADCOM SHALL NOT BE LIABLE FOR DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
* GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
* BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR
* TORT (INCLUDING NEGLIGENCE OR OTHERWISE), EVEN IF ADVISED OF
* THE POSSIBILITY OF SUCH DAMAGE.
********************************************************************* */
/* *********************************************************************
* TCP Constants
********************************************************************* */
#define TCP_MAX_PORTS 8
#define TCP_MAX_TCBS 16
#if defined(CONFIG_MIPS_BRCM)
#define TCP_BUF_SIZE (20 * 1024)
#else
#define TCP_BUF_SIZE 65536
#endif
#define TCP_MAX_SEG_SIZE 1400
#define TCP_CONNECT_TIMER (30*CFE_HZ)
#define TCP_RETX_TIMER (1*CFE_HZ)
#define TCP_TIMEWAIT_TIMER (30*CFE_HZ)
#define TCP_SEND_TIMER (CFE_HZ)
#define TCP_FAST_TIMER (CFE_HZ/5) /* 200ms */
#define TCP_KEEPALIVE_TIMER (CFE_HZ*60) /* one minute */
/* *********************************************************************
* TCP Protocol
********************************************************************* */
#define TCPFLG_FIN 0x0001
#define TCPFLG_SYN 0x0002
#define TCPFLG_RST 0x0004
#define TCPFLG_PSH 0x0008
#define TCPFLG_ACK 0x0010
#define TCPFLG_URG 0x0020
#define TCPHDRSIZE(flg) (((flg) >> 12)*4)
#define TCPHDRFLG(size) (((size)/4)<<12)
#define TCP_HDR_LENGTH 20
#define TCP_MAX_SEG_OPT 0x0204
/* *********************************************************************
* TCP State machine
********************************************************************* */
/*
* TCB states, see RFC
*/
#define TCPSTATE_CLOSED 0
#define TCPSTATE_LISTEN 1
#define TCPSTATE_SYN_SENT 2
#define TCPSTATE_SYN_RECEIVED 3
#define TCPSTATE_ESTABLISHED 4
#define TCPSTATE_CLOSE_WAIT 5
#define TCPSTATE_FINWAIT_1 6
#define TCPSTATE_FINWAIT_2 7
#define TCPSTATE_CLOSING 8
#define TCPSTATE_LAST_ACK 9
#define TCPSTATE_TIME_WAIT 10
/*
* Masks for TCP states - we use these so we can make
* bit vectors of states for easy tests.
*/
#define M_TCPSTATE_CLOSED (1 << TCPSTATE_CLOSED)
#define M_TCPSTATE_LISTEN (1 << TCPSTATE_LISTEN)
#define M_TCPSTATE_SYN_SENT (1 << TCPSTATE_SYN_SENT)
#define M_TCPSTATE_SYN_RECEIVED (1 << TCPSTATE_SYN_RECEIVED)
#define M_TCPSTATE_ESTABLISHED (1 << TCPSTATE_ESTABLISHED)
#define M_TCPSTATE_CLOSE_WAIT (1 << TCPSTATE_CLOSE_WAIT)
#define M_TCPSTATE_FINWAIT_1 (1 << TCPSTATE_FINWAIT_1)
#define M_TCPSTATE_FINWAIT_2 (1 << TCPSTATE_FINWAIT_2)
#define M_TCPSTATE_CLOSING (1 << TCPSTATE_CLOSING)
#define M_TCPSTATE_LAST_ACK (1 << TCPSTATE_LAST_ACK)
#define M_TCPSTATE_TIME_WAIT (1 << TCPSTATE_TIME_WAIT)
#define M_TCPSTATE_CLOSED (1 << TCPSTATE_CLOSED)
/*
* This macro returns true if a given state is in a
* set of states (defined below)
*/
#define TCPSTATE_IN_SET(state,set) ((1 << (state)) & (set))
/*
* Intresting groups of TCP states
*/
/* ABORTSTATES - tcp_abort will send a RST if our TCB is one of these. */
#define M_TCPSTATE_ABORTSTATES \
M_TCPSTATE_SYN_SENT | M_TCPSTATE_SYN_RECEIVED | M_TCPSTATE_ESTABLISHED | \
M_TCPSTATE_FINWAIT_1 | M_TCPSTATE_FINWAIT_2 | M_TCPSTATE_CLOSING | \
M_TCPSTATE_LAST_ACK | M_TCPSTATE_CLOSE_WAIT
/* SEND_OK - tcp_send will send data if our TCB is one of these */
#define M_TCPSTATE_SEND_OK \
M_TCPSTATE_ESTABLISHED | M_TCPSTATE_CLOSE_WAIT
/* RECV_OK - tcp_recv will pass up data if our TCB is in one of these */
#define M_TCPSTATE_RECV_OK \
M_TCPSTATE_ESTABLISHED | M_TCPSTATE_CLOSE_WAIT
/* PEERADDR_OK - tcp_peeraddr will return a value if TCB is in one of these */
#define M_TCPSTATE_PEERADDR_OK \
M_TCPSTATE_SYN_SENT | M_TCPSTATE_SYN_RECEIVED | M_TCPSTATE_ESTABLISHED | \
M_TCPSTATE_FINWAIT_1 | M_TCPSTATE_FINWAIT_2 | M_TCPSTATE_CLOSING | \
M_TCPSTATE_LAST_ACK | M_TCPSTATE_CLOSE_WAIT
/* RESETKEEPALIVE - reset keepalive timer in these states */
#define M_TCPSTATE_RESETKEEPALIVE \
M_TCPSTATE_ESTABLISHED | M_TCPSTATE_CLOSE_WAIT | M_TCPSTATE_FINWAIT_1 | \
M_TCPSTATE_FINWAIT_2 | M_TCPSTATE_CLOSING | M_TCPSTATE_LAST_ACK
#define CONNINPROGRESS - connection is in progress in these states */
#define M_TCPSTATE_CONNINPROGRESS \
M_TCPSTATE_LISTEN | M_TCPSTATE_SYN_SENT | M_TCPSTATE_SYN_RECEIVED
/*
* TCP flags for the control block
*/
#define TCB_FLG_OUTPUT 1 /* need to call tcp_output */
#define TCB_FLG_SENDMSG 2
#define TCB_FLG_DLYACK 4 /* delayed ack is pending */
/* *********************************************************************
* TCP Control Block
********************************************************************* */
typedef struct tcb_s {
queue_t tcb_qb; /* next/previous in list */
int tcb_socknum; /* socket number, index into table */
int tcb_state; /* current connection state */
uint8_t tcb_peeraddr[IP_ADDR_LEN]; /* Peer's IP Address */
uint16_t tcb_peerport; /* Peer's port address */
uint16_t tcb_lclport; /* My port address */
uint16_t tcb_txflags; /* packet flags for next tx packet */
cfe_timer_t tcb_timer_2msl; /* 2MSL timer, used in TIME_WAIT */
cfe_timer_t tcb_timer_keep; /* Timer for keepalives and connections */
cfe_timer_t tcb_timer_retx; /* send retransmission timer */
cfe_timer_t tcb_timer_pers; /* Persist timer */
int tcb_retrycnt; /* Retry counter */
int tcb_mtu; /* MTU if underlying link */
unsigned int tcb_flags; /* Misc protocol flags */
unsigned int tcb_sockflags; /* flags set by user api */
/*
* Buffers
*/
tcpmodbuf_t tcb_txbuf; /* Transmit buffer */
tcpmodbuf_t tcb_rxbuf; /* Receive buffer */
/*
* Send sequence variables
*/
uint32_t tcb_sendunack; /* oldest unacknowledged seqnum */
uint32_t tcb_sendnext; /* Next seqnum to send */
uint32_t tcb_sendwindow; /* Last advertised send window */
/*
* Receive sequence variables
*/
uint32_t tcb_rcvnext; /* next in-order receive seq num */
uint32_t tcb_rcvack; /* last transmitted acknowledgement */
/*
* Window management variables
*/
int tcb_dup_ackcnt; /* Duplicate ack counter */
} tcb_t;
/* *********************************************************************
* Macros to muck with sequence numbers
********************************************************************* */
#define TCPSEQ_LT(a,b) ((int)((a)-(b)) < 0)
#define TCPSEQ_LEQ(a,b) ((int)((a)-(b)) <= 0)
#define TCPSEQ_GT(a,b) ((int)((a)-(b)) > 0)
#define TCPSEQ_GEQ(a,b) ((int)((a)-(b)) >= 0)
#define TCPSEQ_DIFF(a,b) ((int)((a)-(b)))
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