/*
 * CDDL HEADER START
 *
 * The contents of this file are subject to the terms of the
 * Common Development and Distribution License (the "License").
 * You may not use this file except in compliance with the License.
 *
 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
 * or http://www.opensolaris.org/os/licensing.
 * See the License for the specific language governing permissions
 * and limitations under the License.
 *
 * When distributing Covered Code, include this CDDL HEADER in each
 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
 * If applicable, add the following below this CDDL HEADER, with the
 * fields enclosed by brackets "[]" replaced with your own identifying
 * information: Portions Copyright [yyyy] [name of copyright owner]
 *
 * CDDL HEADER END
 */

/*
 * Copyright (c) 2007, 2010, Oracle and/or its affiliates. All rights reserved.
 * Copyright (c) 2017 by Delphix. All rights reserved.
 */

#ifndef _INET_TCP_STACK_H
#define _INET_TCP_STACK_H

#include <sys/netstack.h>
#include <inet/ip.h>
#include <inet/ipdrop.h>
#include <inet/tcp_stats.h>
#include <sys/sunddi.h>
#include <sys/sunldi.h>

#ifdef  __cplusplus
extern "C" {
#endif

#ifdef _KERNEL

/*
 * TCP stack instances
 */
struct tcp_stack {
        netstack_t      *tcps_netstack; /* Common netstack */

        /*
         * Extra privileged ports. In host byte order.
         * Protected by tcp_epriv_port_lock.
         */
#define TCP_NUM_EPRIV_PORTS     64
        int             tcps_g_num_epriv_ports;
        in_port_t       tcps_g_epriv_ports[TCP_NUM_EPRIV_PORTS];
        kmutex_t        tcps_epriv_port_lock;

        /*
         * The smallest anonymous port in the priviledged port range which TCP
         * looks for free port.  Use in the option TCP_ANONPRIVBIND.
         */
        in_port_t       tcps_min_anonpriv_port;

        /* holds the tcp tunables */
        struct mod_prop_info_s *tcps_propinfo_tbl;

        /* Hint not protected by any lock */
        uint_t          tcps_next_port_to_try;

        /* TCP bind hash list - all tcp_t with state >= BOUND. */
        struct tf_s     *tcps_bind_fanout;

        /* TCP queue hash list - all tcp_t in case they will be an acceptor. */
        struct tf_s     *tcps_acceptor_fanout;

        /*
         * MIB-2 stuff for SNMP
         * Note: tcpInErrs {tcp 15} is accumulated in ip.c
         */
        kstat_t         *tcps_mibkp;    /* kstat exporting mib2_tcp_t data */
        kstat_t         *tcps_kstat;    /* kstat exporting tcp_stat_t data */

        uint32_t        tcps_iss_incr_extra;
                                /* Incremented for each connection */
        kmutex_t        tcps_iss_key_lock;
        MD5_CTX         tcps_iss_key;

        /* Packet dropper for TCP IPsec policy drops. */
        ipdropper_t     tcps_dropper;

        /*
         * These two variables control the rate for TCP to generate RSTs in
         * response to segments not belonging to any connections.  We limit
         * TCP to sent out tcp_rst_sent_rate (ndd param) number of RSTs in
         * each 1 second interval.  This is to protect TCP against DoS attack.
         */
        int64_t         tcps_last_rst_intrvl;
        uint32_t        tcps_rst_cnt;

        ldi_ident_t     tcps_ldi_ident;

        /* Used to synchronize access when reclaiming memory */
        mblk_t          *tcps_ixa_cleanup_mp;
        kmutex_t        tcps_ixa_cleanup_lock;
        kcondvar_t      tcps_ixa_cleanup_ready_cv;
        kcondvar_t      tcps_ixa_cleanup_done_cv;

        /* Variables for handling kmem reclaim call back. */
        kmutex_t        tcps_reclaim_lock;
        boolean_t       tcps_reclaim;
        timeout_id_t    tcps_reclaim_tid;
        uint32_t        tcps_reclaim_period;

        /* Listener connection limit configuration. */
        kmutex_t        tcps_listener_conf_lock;
        list_t          tcps_listener_conf;

        struct cc_algo  *tcps_default_cc_algo;

        /* TCP signature database and lock. */
        kmutex_t        tcps_sigdb_lock;
        void            *tcps_sigdb;

        /*
         * Per CPU stats
         *
         * tcps_sc: array of pointer to per CPU stats.  The i-th element in the
         *    array represents the stats of the CPU with cpu_seqid.
         * tcps_sc_cnt: number of CPU stats in the tcps_sc array.
         */
        tcp_stats_cpu_t **tcps_sc;
        int             tcps_sc_cnt;
};

typedef struct tcp_stack tcp_stack_t;

#endif /* _KERNEL */
#ifdef  __cplusplus
}
#endif

#endif  /* _INET_TCP_STACK_H */