inet/tcp/tcp_stats.c

/*
 * 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) 2010, Oracle and/or its affiliates. All rights reserved.
 * Copyright (c) 2011, Joyent Inc. All rights reserved.
 */

#include <sys/types.h>
#include <sys/tihdr.h>
#include <sys/policy.h>
#include <sys/tsol/tnet.h>
#include <sys/kstat.h>

#include <inet/common.h>
#include <inet/ip.h>
#include <inet/tcp.h>
#include <inet/tcp_impl.h>
#include <inet/tcp_stats.h>
#include <inet/kstatcom.h>
#include <inet/snmpcom.h>

static int  tcp_kstat_update(kstat_t *, int);
static int  tcp_kstat2_update(kstat_t *, int);
static void tcp_sum_mib(tcp_stack_t *, mib2_tcp_t *);

static void tcp_add_mib(mib2_tcp_t *, mib2_tcp_t *);
static void tcp_add_stats(tcp_stat_counter_t *, tcp_stat_t *);
static void tcp_clr_stats(tcp_stat_t *);

tcp_g_stat_t    tcp_g_statistics;
kstat_t     *tcp_g_kstat;

/* Translate TCP state to MIB2 TCP state. */
static int
tcp_snmp_state(tcp_t *tcp)
{
    if (tcp == NULL)
        return (0);

    switch (tcp->tcp_state) {
    case TCPS_CLOSED:
    case TCPS_IDLE: /* RFC1213 doesn't have analogue for IDLE & BOUND */
    case TCPS_BOUND:
        return (MIB2_TCP_closed);
    case TCPS_LISTEN:
        return (MIB2_TCP_listen);
    case TCPS_SYN_SENT:
        return (MIB2_TCP_synSent);
    case TCPS_SYN_RCVD:
        return (MIB2_TCP_synReceived);
    case TCPS_ESTABLISHED:
        return (MIB2_TCP_established);
    case TCPS_CLOSE_WAIT:
        return (MIB2_TCP_closeWait);
    case TCPS_FIN_WAIT_1:
        return (MIB2_TCP_finWait1);
    case TCPS_CLOSING:
        return (MIB2_TCP_closing);
    case TCPS_LAST_ACK:
        return (MIB2_TCP_lastAck);
    case TCPS_FIN_WAIT_2:
        return (MIB2_TCP_finWait2);
    case TCPS_TIME_WAIT:
        return (MIB2_TCP_timeWait);
    default:
        return (0);
    }
}

/*
 * Return SNMP stuff in buffer in mpdata.
 */
mblk_t *
tcp_snmp_get(queue_t *q, mblk_t *mpctl, boolean_t legacy_req)
{
    mblk_t          *mpdata;
    mblk_t          *mp_conn_ctl = NULL;
    mblk_t          *mp_conn_tail;
    mblk_t          *mp_attr_ctl = NULL;
    mblk_t          *mp_attr_tail;
    mblk_t          *mp6_conn_ctl = NULL;
    mblk_t          *mp6_conn_tail;
    mblk_t          *mp6_attr_ctl = NULL;
    mblk_t          *mp6_attr_tail;
    struct opthdr       *optp;
    mib2_tcpConnEntry_t tce;
    mib2_tcp6ConnEntry_t    tce6;
    mib2_transportMLPEntry_t mlp;
    connf_t         *connfp;
    int         i;
    boolean_t       ispriv;
    zoneid_t        zoneid;
    int         v4_conn_idx;
    int         v6_conn_idx;
    conn_t          *connp = Q_TO_CONN(q);
    tcp_stack_t     *tcps;
    ip_stack_t      *ipst;
    mblk_t          *mp2ctl;
    mib2_tcp_t      tcp_mib;
    size_t          tcp_mib_size, tce_size, tce6_size;

    /*
     * make a copy of the original message
     */
    mp2ctl = copymsg(mpctl);

    if (mpctl == NULL ||
        (mpdata = mpctl->b_cont) == NULL ||
        (mp_conn_ctl = copymsg(mpctl)) == NULL ||
        (mp_attr_ctl = copymsg(mpctl)) == NULL ||
        (mp6_conn_ctl = copymsg(mpctl)) == NULL ||
        (mp6_attr_ctl = copymsg(mpctl)) == NULL) {
        freemsg(mp_conn_ctl);
        freemsg(mp_attr_ctl);
        freemsg(mp6_conn_ctl);
        freemsg(mp6_attr_ctl);
        freemsg(mpctl);
        freemsg(mp2ctl);
        return (NULL);
    }

    ipst = connp->conn_netstack->netstack_ip;
    tcps = connp->conn_netstack->netstack_tcp;

    if (legacy_req) {
        tcp_mib_size = LEGACY_MIB_SIZE(&tcp_mib, mib2_tcp_t);
        tce_size = LEGACY_MIB_SIZE(&tce, mib2_tcpConnEntry_t);
        tce6_size = LEGACY_MIB_SIZE(&tce6, mib2_tcp6ConnEntry_t);
    } else {
        tcp_mib_size = sizeof (mib2_tcp_t);
        tce_size = sizeof (mib2_tcpConnEntry_t);
        tce6_size = sizeof (mib2_tcp6ConnEntry_t);
    }

    bzero(&tcp_mib, sizeof (tcp_mib));

    /* build table of connections -- need count in fixed part */
    SET_MIB(tcp_mib.tcpRtoAlgorithm, 4);   /* vanj */
    SET_MIB(tcp_mib.tcpRtoMin, tcps->tcps_rexmit_interval_min);
    SET_MIB(tcp_mib.tcpRtoMax, tcps->tcps_rexmit_interval_max);
    SET_MIB(tcp_mib.tcpMaxConn, -1);
    SET_MIB(tcp_mib.tcpCurrEstab, 0);

    ispriv =
        secpolicy_ip_config((Q_TO_CONN(q))->conn_cred, B_TRUE) == 0;
    zoneid = Q_TO_CONN(q)->conn_zoneid;

    v4_conn_idx = v6_conn_idx = 0;
    mp_conn_tail = mp_attr_tail = mp6_conn_tail = mp6_attr_tail = NULL;

    for (i = 0; i < CONN_G_HASH_SIZE; i++) {
        ipst = tcps->tcps_netstack->netstack_ip;

        connfp = &ipst->ips_ipcl_globalhash_fanout[i];

        connp = NULL;

        while ((connp =
            ipcl_get_next_conn(connfp, connp, IPCL_TCPCONN)) != NULL) {
            tcp_t *tcp;
            boolean_t needattr;

            if (connp->conn_zoneid != zoneid)
                continue;   /* not in this zone */

            tcp = connp->conn_tcp;
            TCPS_UPDATE_MIB(tcps, tcpHCInSegs, tcp->tcp_ibsegs);
            tcp->tcp_ibsegs = 0;
            TCPS_UPDATE_MIB(tcps, tcpHCOutSegs, tcp->tcp_obsegs);
            tcp->tcp_obsegs = 0;

            tce6.tcp6ConnState = tce.tcpConnState =
                tcp_snmp_state(tcp);
            if (tce.tcpConnState == MIB2_TCP_established ||
                tce.tcpConnState == MIB2_TCP_closeWait)
                BUMP_MIB(&tcp_mib, tcpCurrEstab);

            needattr = B_FALSE;
            bzero(&mlp, sizeof (mlp));
            if (connp->conn_mlp_type != mlptSingle) {
                if (connp->conn_mlp_type == mlptShared ||
                    connp->conn_mlp_type == mlptBoth)
                    mlp.tme_flags |= MIB2_TMEF_SHARED;
                if (connp->conn_mlp_type == mlptPrivate ||
                    connp->conn_mlp_type == mlptBoth)
                    mlp.tme_flags |= MIB2_TMEF_PRIVATE;
                needattr = B_TRUE;
            }
            if (connp->conn_anon_mlp) {
                mlp.tme_flags |= MIB2_TMEF_ANONMLP;
                needattr = B_TRUE;
            }
            switch (connp->conn_mac_mode) {
            case CONN_MAC_DEFAULT:
                break;
            case CONN_MAC_AWARE:
                mlp.tme_flags |= MIB2_TMEF_MACEXEMPT;
                needattr = B_TRUE;
                break;
            case CONN_MAC_IMPLICIT:
                mlp.tme_flags |= MIB2_TMEF_MACIMPLICIT;
                needattr = B_TRUE;
                break;
            }
            if (connp->conn_ixa->ixa_tsl != NULL) {
                ts_label_t *tsl;

                tsl = connp->conn_ixa->ixa_tsl;
                mlp.tme_flags |= MIB2_TMEF_IS_LABELED;
                mlp.tme_doi = label2doi(tsl);
                mlp.tme_label = *label2bslabel(tsl);
                needattr = B_TRUE;
            }

            /* Create a message to report on IPv6 entries */
            if (connp->conn_ipversion == IPV6_VERSION) {
            tce6.tcp6ConnLocalAddress = connp->conn_laddr_v6;
            tce6.tcp6ConnRemAddress = connp->conn_faddr_v6;
            tce6.tcp6ConnLocalPort = ntohs(connp->conn_lport);
            tce6.tcp6ConnRemPort = ntohs(connp->conn_fport);
            if (connp->conn_ixa->ixa_flags & IXAF_SCOPEID_SET) {
                tce6.tcp6ConnIfIndex =
                    connp->conn_ixa->ixa_scopeid;
            } else {
                tce6.tcp6ConnIfIndex = connp->conn_bound_if;
            }
            /* Don't want just anybody seeing these... */
            if (ispriv) {
                tce6.tcp6ConnEntryInfo.ce_snxt =
                    tcp->tcp_snxt;
                tce6.tcp6ConnEntryInfo.ce_suna =
                    tcp->tcp_suna;
                tce6.tcp6ConnEntryInfo.ce_rnxt =
                    tcp->tcp_rnxt;
                tce6.tcp6ConnEntryInfo.ce_rack =
                    tcp->tcp_rack;
            } else {
                /*
                 * Netstat, unfortunately, uses this to
                 * get send/receive queue sizes.  How to fix?
                 * Why not compute the difference only?
                 */
                tce6.tcp6ConnEntryInfo.ce_snxt =
                    tcp->tcp_snxt - tcp->tcp_suna;
                tce6.tcp6ConnEntryInfo.ce_suna = 0;
                tce6.tcp6ConnEntryInfo.ce_rnxt =
                    tcp->tcp_rnxt - tcp->tcp_rack;
                tce6.tcp6ConnEntryInfo.ce_rack = 0;
            }

            tce6.tcp6ConnEntryInfo.ce_swnd = tcp->tcp_swnd;
            tce6.tcp6ConnEntryInfo.ce_rwnd = tcp->tcp_rwnd;
            tce6.tcp6ConnEntryInfo.ce_rto =  tcp->tcp_rto;
            tce6.tcp6ConnEntryInfo.ce_mss =  tcp->tcp_mss;
            tce6.tcp6ConnEntryInfo.ce_state = tcp->tcp_state;

            tce6.tcp6ConnCreationProcess =
                (connp->conn_cpid < 0) ? MIB2_UNKNOWN_PROCESS :
                connp->conn_cpid;
            tce6.tcp6ConnCreationTime = connp->conn_open_time;

            (void) snmp_append_data2(mp6_conn_ctl->b_cont,
                &mp6_conn_tail, (char *)&tce6, tce6_size);

            mlp.tme_connidx = v6_conn_idx++;
            if (needattr)
                (void) snmp_append_data2(mp6_attr_ctl->b_cont,
                    &mp6_attr_tail, (char *)&mlp, sizeof (mlp));
            }
            /*
             * Create an IPv4 table entry for IPv4 entries and also
             * for IPv6 entries which are bound to in6addr_any
             * but don't have IPV6_V6ONLY set.
             * (i.e. anything an IPv4 peer could connect to)
             */
            if (connp->conn_ipversion == IPV4_VERSION ||
                (tcp->tcp_state <= TCPS_LISTEN &&
                !connp->conn_ipv6_v6only &&
                IN6_IS_ADDR_UNSPECIFIED(&connp->conn_laddr_v6))) {
                if (connp->conn_ipversion == IPV6_VERSION) {
                    tce.tcpConnRemAddress = INADDR_ANY;
                    tce.tcpConnLocalAddress = INADDR_ANY;
                } else {
                    tce.tcpConnRemAddress =
                        connp->conn_faddr_v4;
                    tce.tcpConnLocalAddress =
                        connp->conn_laddr_v4;
                }
                tce.tcpConnLocalPort = ntohs(connp->conn_lport);
                tce.tcpConnRemPort = ntohs(connp->conn_fport);
                /* Don't want just anybody seeing these... */
                if (ispriv) {
                    tce.tcpConnEntryInfo.ce_snxt =
                        tcp->tcp_snxt;
                    tce.tcpConnEntryInfo.ce_suna =
                        tcp->tcp_suna;
                    tce.tcpConnEntryInfo.ce_rnxt =
                        tcp->tcp_rnxt;
                    tce.tcpConnEntryInfo.ce_rack =
                        tcp->tcp_rack;
                } else {
                    /*
                     * Netstat, unfortunately, uses this to
                     * get send/receive queue sizes.  How
                     * to fix?
                     * Why not compute the difference only?
                     */
                    tce.tcpConnEntryInfo.ce_snxt =
                        tcp->tcp_snxt - tcp->tcp_suna;
                    tce.tcpConnEntryInfo.ce_suna = 0;
                    tce.tcpConnEntryInfo.ce_rnxt =
                        tcp->tcp_rnxt - tcp->tcp_rack;
                    tce.tcpConnEntryInfo.ce_rack = 0;
                }

                tce.tcpConnEntryInfo.ce_swnd = tcp->tcp_swnd;
                tce.tcpConnEntryInfo.ce_rwnd = tcp->tcp_rwnd;
                tce.tcpConnEntryInfo.ce_rto =  tcp->tcp_rto;
                tce.tcpConnEntryInfo.ce_mss =  tcp->tcp_mss;
                tce.tcpConnEntryInfo.ce_state =
                    tcp->tcp_state;

                tce.tcpConnCreationProcess =
                    (connp->conn_cpid < 0) ?
                    MIB2_UNKNOWN_PROCESS :
                    connp->conn_cpid;
                tce.tcpConnCreationTime = connp->conn_open_time;

                (void) snmp_append_data2(mp_conn_ctl->b_cont,
                    &mp_conn_tail, (char *)&tce, tce_size);

                mlp.tme_connidx = v4_conn_idx++;
                if (needattr)
                    (void) snmp_append_data2(
                        mp_attr_ctl->b_cont,
                        &mp_attr_tail, (char *)&mlp,
                        sizeof (mlp));
            }
        }
    }

    tcp_sum_mib(tcps, &tcp_mib);

    /* Fixed length structure for IPv4 and IPv6 counters */
    SET_MIB(tcp_mib.tcpConnTableSize, tce_size);
    SET_MIB(tcp_mib.tcp6ConnTableSize, tce6_size);

    /*
     * Synchronize 32- and 64-bit counters.  Note that tcpInSegs and
     * tcpOutSegs are not updated anywhere in TCP.  The new 64 bits
     * counters are used.  Hence the old counters' values in tcp_sc_mib
     * are always 0.
     */
    SYNC32_MIB(&tcp_mib, tcpInSegs, tcpHCInSegs);
    SYNC32_MIB(&tcp_mib, tcpOutSegs, tcpHCOutSegs);

    optp = (struct opthdr *)&mpctl->b_rptr[sizeof (struct T_optmgmt_ack)];
    optp->level = MIB2_TCP;
    optp->name = 0;
    (void) snmp_append_data(mpdata, (char *)&tcp_mib, tcp_mib_size);
    optp->len = msgdsize(mpdata);
    qreply(q, mpctl);

    /* table of connections... */
    optp = (struct opthdr *)&mp_conn_ctl->b_rptr[
        sizeof (struct T_optmgmt_ack)];
    optp->level = MIB2_TCP;
    optp->name = MIB2_TCP_CONN;
    optp->len = msgdsize(mp_conn_ctl->b_cont);
    qreply(q, mp_conn_ctl);

    /* table of MLP attributes... */
    optp = (struct opthdr *)&mp_attr_ctl->b_rptr[
        sizeof (struct T_optmgmt_ack)];
    optp->level = MIB2_TCP;
    optp->name = EXPER_XPORT_MLP;
    optp->len = msgdsize(mp_attr_ctl->b_cont);
    if (optp->len == 0)
        freemsg(mp_attr_ctl);
    else
        qreply(q, mp_attr_ctl);

    /* table of IPv6 connections... */
    optp = (struct opthdr *)&mp6_conn_ctl->b_rptr[
        sizeof (struct T_optmgmt_ack)];
    optp->level = MIB2_TCP6;
    optp->name = MIB2_TCP6_CONN;
    optp->len = msgdsize(mp6_conn_ctl->b_cont);
    qreply(q, mp6_conn_ctl);

    /* table of IPv6 MLP attributes... */
    optp = (struct opthdr *)&mp6_attr_ctl->b_rptr[
        sizeof (struct T_optmgmt_ack)];
    optp->level = MIB2_TCP6;
    optp->name = EXPER_XPORT_MLP;
    optp->len = msgdsize(mp6_attr_ctl->b_cont);
    if (optp->len == 0)
        freemsg(mp6_attr_ctl);
    else
        qreply(q, mp6_attr_ctl);
    return (mp2ctl);
}

/* Return 0 if invalid set request, 1 otherwise, including non-tcp requests  */
/* ARGSUSED */
int
tcp_snmp_set(queue_t *q, int level, int name, uchar_t *ptr, int len)
{
    mib2_tcpConnEntry_t *tce = (mib2_tcpConnEntry_t *)ptr;

    switch (level) {
    case MIB2_TCP:
        switch (name) {
        case 13:
            if (tce->tcpConnState != MIB2_TCP_deleteTCB)
                return (0);
            /* TODO: delete entry defined by tce */
            return (1);
        default:
            return (0);
        }
    default:
        return (1);
    }
}

/*
 * TCP Kstats implementation
 */
void *
tcp_kstat_init(netstackid_t stackid)
{
    kstat_t *ksp;

    tcp_named_kstat_t template = {
        { "rtoAlgorithm",   KSTAT_DATA_INT32, 0 },
        { "rtoMin",     KSTAT_DATA_INT32, 0 },
        { "rtoMax",     KSTAT_DATA_INT32, 0 },
        { "maxConn",        KSTAT_DATA_INT32, 0 },
        { "activeOpens",    KSTAT_DATA_UINT32, 0 },
        { "passiveOpens",   KSTAT_DATA_UINT32, 0 },
        { "attemptFails",   KSTAT_DATA_UINT32, 0 },
        { "estabResets",    KSTAT_DATA_UINT32, 0 },
        { "currEstab",      KSTAT_DATA_UINT32, 0 },
        { "inSegs",     KSTAT_DATA_UINT64, 0 },
        { "outSegs",        KSTAT_DATA_UINT64, 0 },
        { "retransSegs",    KSTAT_DATA_UINT32, 0 },
        { "connTableSize",  KSTAT_DATA_INT32, 0 },
        { "outRsts",        KSTAT_DATA_UINT32, 0 },
        { "outDataSegs",    KSTAT_DATA_UINT32, 0 },
        { "outDataBytes",   KSTAT_DATA_UINT32, 0 },
        { "retransBytes",   KSTAT_DATA_UINT32, 0 },
        { "outAck",     KSTAT_DATA_UINT32, 0 },
        { "outAckDelayed",  KSTAT_DATA_UINT32, 0 },
        { "outUrg",     KSTAT_DATA_UINT32, 0 },
        { "outWinUpdate",   KSTAT_DATA_UINT32, 0 },
        { "outWinProbe",    KSTAT_DATA_UINT32, 0 },
        { "outControl",     KSTAT_DATA_UINT32, 0 },
        { "outFastRetrans", KSTAT_DATA_UINT32, 0 },
        { "inAckSegs",      KSTAT_DATA_UINT32, 0 },
        { "inAckBytes",     KSTAT_DATA_UINT32, 0 },
        { "inDupAck",       KSTAT_DATA_UINT32, 0 },
        { "inAckUnsent",    KSTAT_DATA_UINT32, 0 },
        { "inDataInorderSegs",  KSTAT_DATA_UINT32, 0 },
        { "inDataInorderBytes", KSTAT_DATA_UINT32, 0 },
        { "inDataUnorderSegs",  KSTAT_DATA_UINT32, 0 },
        { "inDataUnorderBytes", KSTAT_DATA_UINT32, 0 },
        { "inDataDupSegs",  KSTAT_DATA_UINT32, 0 },
        { "inDataDupBytes", KSTAT_DATA_UINT32, 0 },
        { "inDataPartDupSegs",  KSTAT_DATA_UINT32, 0 },
        { "inDataPartDupBytes", KSTAT_DATA_UINT32, 0 },
        { "inDataPastWinSegs",  KSTAT_DATA_UINT32, 0 },
        { "inDataPastWinBytes", KSTAT_DATA_UINT32, 0 },
        { "inWinProbe",     KSTAT_DATA_UINT32, 0 },
        { "inWinUpdate",    KSTAT_DATA_UINT32, 0 },
        { "inClosed",       KSTAT_DATA_UINT32, 0 },
        { "rttUpdate",      KSTAT_DATA_UINT32, 0 },
        { "rttNoUpdate",    KSTAT_DATA_UINT32, 0 },
        { "timRetrans",     KSTAT_DATA_UINT32, 0 },
        { "timRetransDrop", KSTAT_DATA_UINT32, 0 },
        { "timKeepalive",   KSTAT_DATA_UINT32, 0 },
        { "timKeepaliveProbe",  KSTAT_DATA_UINT32, 0 },
        { "timKeepaliveDrop",   KSTAT_DATA_UINT32, 0 },
        { "listenDrop",     KSTAT_DATA_UINT32, 0 },
        { "listenDropQ0",   KSTAT_DATA_UINT32, 0 },
        { "halfOpenDrop",   KSTAT_DATA_UINT32, 0 },
        { "outSackRetransSegs", KSTAT_DATA_UINT32, 0 },
        { "connTableSize6", KSTAT_DATA_INT32, 0 }
    };

    ksp = kstat_create_netstack(TCP_MOD_NAME, stackid, TCP_MOD_NAME, "mib2",
        KSTAT_TYPE_NAMED, NUM_OF_FIELDS(tcp_named_kstat_t), 0, stackid);

    if (ksp == NULL)
        return (NULL);

    template.rtoAlgorithm.value.ui32 = 4;
    template.maxConn.value.i32 = -1;

    bcopy(&template, ksp->ks_data, sizeof (template));
    ksp->ks_update = tcp_kstat_update;
    ksp->ks_private = (void *)(uintptr_t)stackid;

    /*
     * If this is an exclusive netstack for a local zone, the global zone
     * should still be able to read the kstat.
     */
    if (stackid != GLOBAL_NETSTACKID)
        kstat_zone_add(ksp, GLOBAL_ZONEID);

    kstat_install(ksp);
    return (ksp);
}

void
tcp_kstat_fini(netstackid_t stackid, kstat_t *ksp)
{
    if (ksp != NULL) {
        ASSERT(stackid == (netstackid_t)(uintptr_t)ksp->ks_private);
        kstat_delete_netstack(ksp, stackid);
    }
}

static int
tcp_kstat_update(kstat_t *kp, int rw)
{
    tcp_named_kstat_t *tcpkp;
    tcp_t       *tcp;
    connf_t     *connfp;
    conn_t      *connp;
    int         i;
    netstackid_t    stackid = (netstackid_t)(uintptr_t)kp->ks_private;
    netstack_t  *ns;
    tcp_stack_t *tcps;
    ip_stack_t  *ipst;
    mib2_tcp_t  tcp_mib;

    if (rw == KSTAT_WRITE)
        return (EACCES);

    ns = netstack_find_by_stackid(stackid);
    if (ns == NULL)
        return (-1);
    tcps = ns->netstack_tcp;
    if (tcps == NULL) {
        netstack_rele(ns);
        return (-1);
    }

    tcpkp = (tcp_named_kstat_t *)kp->ks_data;

    tcpkp->currEstab.value.ui32 = 0;
    tcpkp->rtoMin.value.ui32 = tcps->tcps_rexmit_interval_min;
    tcpkp->rtoMax.value.ui32 = tcps->tcps_rexmit_interval_max;

    ipst = ns->netstack_ip;

    for (i = 0; i < CONN_G_HASH_SIZE; i++) {
        connfp = &ipst->ips_ipcl_globalhash_fanout[i];
        connp = NULL;
        while ((connp =
            ipcl_get_next_conn(connfp, connp, IPCL_TCPCONN)) != NULL) {
            tcp = connp->conn_tcp;
            switch (tcp_snmp_state(tcp)) {
            case MIB2_TCP_established:
            case MIB2_TCP_closeWait:
                tcpkp->currEstab.value.ui32++;
                break;
            }
        }
    }
    bzero(&tcp_mib, sizeof (tcp_mib));
    tcp_sum_mib(tcps, &tcp_mib);

    /* Fixed length structure for IPv4 and IPv6 counters */
    SET_MIB(tcp_mib.tcpConnTableSize, sizeof (mib2_tcpConnEntry_t));
    SET_MIB(tcp_mib.tcp6ConnTableSize, sizeof (mib2_tcp6ConnEntry_t));

    tcpkp->activeOpens.value.ui32 = tcp_mib.tcpActiveOpens;
    tcpkp->passiveOpens.value.ui32 = tcp_mib.tcpPassiveOpens;
    tcpkp->attemptFails.value.ui32 = tcp_mib.tcpAttemptFails;
    tcpkp->estabResets.value.ui32 = tcp_mib.tcpEstabResets;
    tcpkp->inSegs.value.ui64 = tcp_mib.tcpHCInSegs;
    tcpkp->outSegs.value.ui64 = tcp_mib.tcpHCOutSegs;
    tcpkp->retransSegs.value.ui32 = tcp_mib.tcpRetransSegs;
    tcpkp->connTableSize.value.i32 = tcp_mib.tcpConnTableSize;
    tcpkp->outRsts.value.ui32 = tcp_mib.tcpOutRsts;
    tcpkp->outDataSegs.value.ui32 = tcp_mib.tcpOutDataSegs;
    tcpkp->outDataBytes.value.ui32 = tcp_mib.tcpOutDataBytes;
    tcpkp->retransBytes.value.ui32 = tcp_mib.tcpRetransBytes;
    tcpkp->outAck.value.ui32 = tcp_mib.tcpOutAck;
    tcpkp->outAckDelayed.value.ui32 = tcp_mib.tcpOutAckDelayed;
    tcpkp->outUrg.value.ui32 = tcp_mib.tcpOutUrg;
    tcpkp->outWinUpdate.value.ui32 = tcp_mib.tcpOutWinUpdate;
    tcpkp->outWinProbe.value.ui32 = tcp_mib.tcpOutWinProbe;
    tcpkp->outControl.value.ui32 = tcp_mib.tcpOutControl;
    tcpkp->outFastRetrans.value.ui32 = tcp_mib.tcpOutFastRetrans;
    tcpkp->inAckSegs.value.ui32 = tcp_mib.tcpInAckSegs;
    tcpkp->inAckBytes.value.ui32 = tcp_mib.tcpInAckBytes;
    tcpkp->inDupAck.value.ui32 = tcp_mib.tcpInDupAck;
    tcpkp->inAckUnsent.value.ui32 = tcp_mib.tcpInAckUnsent;
    tcpkp->inDataInorderSegs.value.ui32 = tcp_mib.tcpInDataInorderSegs;
    tcpkp->inDataInorderBytes.value.ui32 = tcp_mib.tcpInDataInorderBytes;
    tcpkp->inDataUnorderSegs.value.ui32 = tcp_mib.tcpInDataUnorderSegs;
    tcpkp->inDataUnorderBytes.value.ui32 = tcp_mib.tcpInDataUnorderBytes;
    tcpkp->inDataDupSegs.value.ui32 = tcp_mib.tcpInDataDupSegs;
    tcpkp->inDataDupBytes.value.ui32 = tcp_mib.tcpInDataDupBytes;
    tcpkp->inDataPartDupSegs.value.ui32 = tcp_mib.tcpInDataPartDupSegs;
    tcpkp->inDataPartDupBytes.value.ui32 = tcp_mib.tcpInDataPartDupBytes;
    tcpkp->inDataPastWinSegs.value.ui32 = tcp_mib.tcpInDataPastWinSegs;
    tcpkp->inDataPastWinBytes.value.ui32 = tcp_mib.tcpInDataPastWinBytes;
    tcpkp->inWinProbe.value.ui32 = tcp_mib.tcpInWinProbe;
    tcpkp->inWinUpdate.value.ui32 = tcp_mib.tcpInWinUpdate;
    tcpkp->inClosed.value.ui32 = tcp_mib.tcpInClosed;
    tcpkp->rttNoUpdate.value.ui32 = tcp_mib.tcpRttNoUpdate;
    tcpkp->rttUpdate.value.ui32 = tcp_mib.tcpRttUpdate;
    tcpkp->timRetrans.value.ui32 = tcp_mib.tcpTimRetrans;
    tcpkp->timRetransDrop.value.ui32 = tcp_mib.tcpTimRetransDrop;
    tcpkp->timKeepalive.value.ui32 = tcp_mib.tcpTimKeepalive;
    tcpkp->timKeepaliveProbe.value.ui32 = tcp_mib.tcpTimKeepaliveProbe;
    tcpkp->timKeepaliveDrop.value.ui32 = tcp_mib.tcpTimKeepaliveDrop;
    tcpkp->listenDrop.value.ui32 = tcp_mib.tcpListenDrop;
    tcpkp->listenDropQ0.value.ui32 = tcp_mib.tcpListenDropQ0;
    tcpkp->halfOpenDrop.value.ui32 = tcp_mib.tcpHalfOpenDrop;
    tcpkp->outSackRetransSegs.value.ui32 = tcp_mib.tcpOutSackRetransSegs;
    tcpkp->connTableSize6.value.i32 = tcp_mib.tcp6ConnTableSize;

    netstack_rele(ns);
    return (0);
}

/*
 * kstats related to squeues i.e. not per IP instance
 */
void *
tcp_g_kstat_init(tcp_g_stat_t *tcp_g_statp)
{
    kstat_t *ksp;

    tcp_g_stat_t template = {
        { "tcp_timermp_alloced",    KSTAT_DATA_UINT64 },
        { "tcp_timermp_allocfail",  KSTAT_DATA_UINT64 },
        { "tcp_timermp_allocdblfail",   KSTAT_DATA_UINT64 },
        { "tcp_freelist_cleanup",   KSTAT_DATA_UINT64 },
    };

    ksp = kstat_create(TCP_MOD_NAME, 0, "tcpstat_g", "net",
        KSTAT_TYPE_NAMED, sizeof (template) / sizeof (kstat_named_t),
        KSTAT_FLAG_VIRTUAL);

    if (ksp == NULL)
        return (NULL);

    bcopy(&template, tcp_g_statp, sizeof (template));
    ksp->ks_data = (void *)tcp_g_statp;

    kstat_install(ksp);
    return (ksp);
}

void
tcp_g_kstat_fini(kstat_t *ksp)
{
    if (ksp != NULL) {
        kstat_delete(ksp);
    }
}

void *
tcp_kstat2_init(netstackid_t stackid)
{
    kstat_t *ksp;

    tcp_stat_t template = {
        { "tcp_time_wait_syn_success",  KSTAT_DATA_UINT64, 0 },
        { "tcp_clean_death_nondetached",    KSTAT_DATA_UINT64, 0 },
        { "tcp_eager_blowoff_q",    KSTAT_DATA_UINT64, 0 },
        { "tcp_eager_blowoff_q0",   KSTAT_DATA_UINT64, 0 },
        { "tcp_no_listener",        KSTAT_DATA_UINT64, 0 },
        { "tcp_listendrop",     KSTAT_DATA_UINT64, 0 },
        { "tcp_listendropq0",       KSTAT_DATA_UINT64, 0 },
        { "tcp_wsrv_called",        KSTAT_DATA_UINT64, 0 },
        { "tcp_flwctl_on",      KSTAT_DATA_UINT64, 0 },
        { "tcp_timer_fire_early",   KSTAT_DATA_UINT64, 0 },
        { "tcp_timer_fire_miss",    KSTAT_DATA_UINT64, 0 },
        { "tcp_zcopy_on",       KSTAT_DATA_UINT64, 0 },
        { "tcp_zcopy_off",      KSTAT_DATA_UINT64, 0 },
        { "tcp_zcopy_backoff",      KSTAT_DATA_UINT64, 0 },
        { "tcp_fusion_flowctl",     KSTAT_DATA_UINT64, 0 },
        { "tcp_fusion_backenabled", KSTAT_DATA_UINT64, 0 },
        { "tcp_fusion_urg",     KSTAT_DATA_UINT64, 0 },
        { "tcp_fusion_putnext",     KSTAT_DATA_UINT64, 0 },
        { "tcp_fusion_unfusable",   KSTAT_DATA_UINT64, 0 },
        { "tcp_fusion_aborted",     KSTAT_DATA_UINT64, 0 },
        { "tcp_fusion_unqualified", KSTAT_DATA_UINT64, 0 },
        { "tcp_fusion_rrw_busy",    KSTAT_DATA_UINT64, 0 },
        { "tcp_fusion_rrw_msgcnt",  KSTAT_DATA_UINT64, 0 },
        { "tcp_fusion_rrw_plugged", KSTAT_DATA_UINT64, 0 },
        { "tcp_in_ack_unsent_drop", KSTAT_DATA_UINT64, 0 },
        { "tcp_sock_fallback",      KSTAT_DATA_UINT64, 0 },
        { "tcp_lso_enabled",        KSTAT_DATA_UINT64, 0 },
        { "tcp_lso_disabled",       KSTAT_DATA_UINT64, 0 },
        { "tcp_lso_times",      KSTAT_DATA_UINT64, 0 },
        { "tcp_lso_pkt_out",        KSTAT_DATA_UINT64, 0 },
        { "tcp_listen_cnt_drop",    KSTAT_DATA_UINT64, 0 },
        { "tcp_listen_mem_drop",    KSTAT_DATA_UINT64, 0 },
        { "tcp_zwin_mem_drop",      KSTAT_DATA_UINT64, 0 },
        { "tcp_zwin_ack_syn",       KSTAT_DATA_UINT64, 0 },
        { "tcp_rst_unsent",     KSTAT_DATA_UINT64, 0 },
        { "tcp_reclaim_cnt",        KSTAT_DATA_UINT64, 0 },
        { "tcp_reass_timeout",      KSTAT_DATA_UINT64, 0 },
#ifdef TCP_DEBUG_COUNTER
        { "tcp_time_wait",      KSTAT_DATA_UINT64, 0 },
        { "tcp_rput_time_wait",     KSTAT_DATA_UINT64, 0 },
        { "tcp_detach_time_wait",   KSTAT_DATA_UINT64, 0 },
        { "tcp_timeout_calls",      KSTAT_DATA_UINT64, 0 },
        { "tcp_timeout_cached_alloc",   KSTAT_DATA_UINT64, 0 },
        { "tcp_timeout_cancel_reqs",    KSTAT_DATA_UINT64, 0 },
        { "tcp_timeout_canceled",   KSTAT_DATA_UINT64, 0 },
        { "tcp_timermp_freed",      KSTAT_DATA_UINT64, 0 },
        { "tcp_push_timer_cnt",     KSTAT_DATA_UINT64, 0 },
        { "tcp_ack_timer_cnt",      KSTAT_DATA_UINT64, 0 },
#endif
    };

    ksp = kstat_create_netstack(TCP_MOD_NAME, stackid, "tcpstat", "net",
        KSTAT_TYPE_NAMED, sizeof (template) / sizeof (kstat_named_t), 0,
        stackid);

    if (ksp == NULL)
        return (NULL);

    bcopy(&template, ksp->ks_data, sizeof (template));
    ksp->ks_private = (void *)(uintptr_t)stackid;
    ksp->ks_update = tcp_kstat2_update;

    /*
     * If this is an exclusive netstack for a local zone, the global zone
     * should still be able to read the kstat.
     */
    if (stackid != GLOBAL_NETSTACKID)
        kstat_zone_add(ksp, GLOBAL_ZONEID);

    kstat_install(ksp);
    return (ksp);
}

void
tcp_kstat2_fini(netstackid_t stackid, kstat_t *ksp)
{
    if (ksp != NULL) {
        ASSERT(stackid == (netstackid_t)(uintptr_t)ksp->ks_private);
        kstat_delete_netstack(ksp, stackid);
    }
}

/*
 * Sum up all per CPU tcp_stat_t kstat counters.
 */
static int
tcp_kstat2_update(kstat_t *kp, int rw)
{
    netstackid_t    stackid = (netstackid_t)(uintptr_t)kp->ks_private;
    netstack_t  *ns;
    tcp_stack_t *tcps;
    tcp_stat_t  *stats;
    int     i;
    int     cnt;

    if (rw == KSTAT_WRITE)
        return (EACCES);

    ns = netstack_find_by_stackid(stackid);
    if (ns == NULL)
        return (-1);
    tcps = ns->netstack_tcp;
    if (tcps == NULL) {
        netstack_rele(ns);
        return (-1);
    }

    stats = (tcp_stat_t *)kp->ks_data;
    tcp_clr_stats(stats);

    /*
     * tcps_sc_cnt may change in the middle of the loop.  It is better
     * to get its value first.
     */
    cnt = tcps->tcps_sc_cnt;
    for (i = 0; i < cnt; i++)
        tcp_add_stats(&tcps->tcps_sc[i]->tcp_sc_stats, stats);

    netstack_rele(ns);
    return (0);
}

/*
 * To add stats from one mib2_tcp_t to another.  Static fields are not added.
 * The caller should set them up propertly.
 */
static void
tcp_add_mib(mib2_tcp_t *from, mib2_tcp_t *to)
{
    to->tcpActiveOpens += from->tcpActiveOpens;
    to->tcpPassiveOpens += from->tcpPassiveOpens;
    to->tcpAttemptFails += from->tcpAttemptFails;
    to->tcpEstabResets += from->tcpEstabResets;
    to->tcpInSegs += from->tcpInSegs;
    to->tcpOutSegs += from->tcpOutSegs;
    to->tcpRetransSegs += from->tcpRetransSegs;
    to->tcpOutRsts += from->tcpOutRsts;

    to->tcpOutDataSegs += from->tcpOutDataSegs;
    to->tcpOutDataBytes += from->tcpOutDataBytes;
    to->tcpRetransBytes += from->tcpRetransBytes;
    to->tcpOutAck += from->tcpOutAck;
    to->tcpOutAckDelayed += from->tcpOutAckDelayed;
    to->tcpOutUrg += from->tcpOutUrg;
    to->tcpOutWinUpdate += from->tcpOutWinUpdate;
    to->tcpOutWinProbe += from->tcpOutWinProbe;
    to->tcpOutControl += from->tcpOutControl;
    to->tcpOutFastRetrans += from->tcpOutFastRetrans;

    to->tcpInAckBytes += from->tcpInAckBytes;
    to->tcpInDupAck += from->tcpInDupAck;
    to->tcpInAckUnsent += from->tcpInAckUnsent;
    to->tcpInDataInorderSegs += from->tcpInDataInorderSegs;
    to->tcpInDataInorderBytes += from->tcpInDataInorderBytes;
    to->tcpInDataUnorderSegs += from->tcpInDataUnorderSegs;
    to->tcpInDataUnorderBytes += from->tcpInDataUnorderBytes;
    to->tcpInDataDupSegs += from->tcpInDataDupSegs;
    to->tcpInDataDupBytes += from->tcpInDataDupBytes;
    to->tcpInDataPartDupSegs += from->tcpInDataPartDupSegs;
    to->tcpInDataPartDupBytes += from->tcpInDataPartDupBytes;
    to->tcpInDataPastWinSegs += from->tcpInDataPastWinSegs;
    to->tcpInDataPastWinBytes += from->tcpInDataPastWinBytes;
    to->tcpInWinProbe += from->tcpInWinProbe;
    to->tcpInWinUpdate += from->tcpInWinUpdate;
    to->tcpInClosed += from->tcpInClosed;

    to->tcpRttNoUpdate += from->tcpRttNoUpdate;
    to->tcpRttUpdate += from->tcpRttUpdate;
    to->tcpTimRetrans += from->tcpTimRetrans;
    to->tcpTimRetransDrop += from->tcpTimRetransDrop;
    to->tcpTimKeepalive += from->tcpTimKeepalive;
    to->tcpTimKeepaliveProbe += from->tcpTimKeepaliveProbe;
    to->tcpTimKeepaliveDrop += from->tcpTimKeepaliveDrop;
    to->tcpListenDrop += from->tcpListenDrop;
    to->tcpListenDropQ0 += from->tcpListenDropQ0;
    to->tcpHalfOpenDrop += from->tcpHalfOpenDrop;
    to->tcpOutSackRetransSegs += from->tcpOutSackRetransSegs;
    to->tcpHCInSegs += from->tcpHCInSegs;
    to->tcpHCOutSegs += from->tcpHCOutSegs;
}

/*
 * To sum up all MIB2 stats for a tcp_stack_t from all per CPU stats.  The
 * caller should initialize the target mib2_tcp_t properly as this function
 * just adds up all the per CPU stats.
 */
static void
tcp_sum_mib(tcp_stack_t *tcps, mib2_tcp_t *tcp_mib)
{
    int i;
    int cnt;

    /*
     * tcps_sc_cnt may change in the middle of the loop.  It is better
     * to get its value first.
     */
    cnt = tcps->tcps_sc_cnt;
    for (i = 0; i < cnt; i++)
        tcp_add_mib(&tcps->tcps_sc[i]->tcp_sc_mib, tcp_mib);
}

/*
 * To set all tcp_stat_t counters to 0.
 */
static void
tcp_clr_stats(tcp_stat_t *stats)
{
    stats->tcp_time_wait_syn_success.value.ui64 = 0;
    stats->tcp_clean_death_nondetached.value.ui64 = 0;
    stats->tcp_eager_blowoff_q.value.ui64 = 0;
    stats->tcp_eager_blowoff_q0.value.ui64 = 0;
    stats->tcp_no_listener.value.ui64 = 0;
    stats->tcp_listendrop.value.ui64 = 0;
    stats->tcp_listendropq0.value.ui64 = 0;
    stats->tcp_wsrv_called.value.ui64 = 0;
    stats->tcp_flwctl_on.value.ui64 = 0;
    stats->tcp_timer_fire_early.value.ui64 = 0;
    stats->tcp_timer_fire_miss.value.ui64 = 0;
    stats->tcp_zcopy_on.value.ui64 = 0;
    stats->tcp_zcopy_off.value.ui64 = 0;
    stats->tcp_zcopy_backoff.value.ui64 = 0;
    stats->tcp_fusion_flowctl.value.ui64 = 0;
    stats->tcp_fusion_backenabled.value.ui64 = 0;
    stats->tcp_fusion_urg.value.ui64 = 0;
    stats->tcp_fusion_putnext.value.ui64 = 0;
    stats->tcp_fusion_unfusable.value.ui64 = 0;
    stats->tcp_fusion_aborted.value.ui64 = 0;
    stats->tcp_fusion_unqualified.value.ui64 = 0;
    stats->tcp_fusion_rrw_busy.value.ui64 = 0;
    stats->tcp_fusion_rrw_msgcnt.value.ui64 = 0;
    stats->tcp_fusion_rrw_plugged.value.ui64 = 0;
    stats->tcp_in_ack_unsent_drop.value.ui64 = 0;
    stats->tcp_sock_fallback.value.ui64 = 0;
    stats->tcp_lso_enabled.value.ui64 = 0;
    stats->tcp_lso_disabled.value.ui64 = 0;
    stats->tcp_lso_times.value.ui64 = 0;
    stats->tcp_lso_pkt_out.value.ui64 = 0;
    stats->tcp_listen_cnt_drop.value.ui64 = 0;
    stats->tcp_listen_mem_drop.value.ui64 = 0;
    stats->tcp_zwin_mem_drop.value.ui64 = 0;
    stats->tcp_zwin_ack_syn.value.ui64 = 0;
    stats->tcp_rst_unsent.value.ui64 = 0;
    stats->tcp_reclaim_cnt.value.ui64 = 0;
    stats->tcp_reass_timeout.value.ui64 = 0;

#ifdef TCP_DEBUG_COUNTER
    stats->tcp_time_wait.value.ui64 = 0;
    stats->tcp_rput_time_wait.value.ui64 = 0;
    stats->tcp_detach_time_wait.value.ui64 = 0;
    stats->tcp_timeout_calls.value.ui64 = 0;
    stats->tcp_timeout_cached_alloc.value.ui64 = 0;
    stats->tcp_timeout_cancel_reqs.value.ui64 = 0;
    stats->tcp_timeout_canceled.value.ui64 = 0;
    stats->tcp_timermp_freed.value.ui64 = 0;
    stats->tcp_push_timer_cnt.value.ui64 = 0;
    stats->tcp_ack_timer_cnt.value.ui64 = 0;
#endif
}

/*
 * To add counters from the per CPU tcp_stat_counter_t to the stack
 * tcp_stat_t.
 */
static void
tcp_add_stats(tcp_stat_counter_t *from, tcp_stat_t *to)
{
    to->tcp_time_wait_syn_success.value.ui64 +=
        from->tcp_time_wait_syn_success;
    to->tcp_clean_death_nondetached.value.ui64 +=
        from->tcp_clean_death_nondetached;
    to->tcp_eager_blowoff_q.value.ui64 +=
        from->tcp_eager_blowoff_q;
    to->tcp_eager_blowoff_q0.value.ui64 +=
        from->tcp_eager_blowoff_q0;
    to->tcp_no_listener.value.ui64 +=
        from->tcp_no_listener;
    to->tcp_listendrop.value.ui64 +=
        from->tcp_listendrop;
    to->tcp_listendropq0.value.ui64 +=
        from->tcp_listendropq0;
    to->tcp_wsrv_called.value.ui64 +=
        from->tcp_wsrv_called;
    to->tcp_flwctl_on.value.ui64 +=
        from->tcp_flwctl_on;
    to->tcp_timer_fire_early.value.ui64 +=
        from->tcp_timer_fire_early;
    to->tcp_timer_fire_miss.value.ui64 +=
        from->tcp_timer_fire_miss;
    to->tcp_zcopy_on.value.ui64 +=
        from->tcp_zcopy_on;
    to->tcp_zcopy_off.value.ui64 +=
        from->tcp_zcopy_off;
    to->tcp_zcopy_backoff.value.ui64 +=
        from->tcp_zcopy_backoff;
    to->tcp_fusion_flowctl.value.ui64 +=
        from->tcp_fusion_flowctl;
    to->tcp_fusion_backenabled.value.ui64 +=
        from->tcp_fusion_backenabled;
    to->tcp_fusion_urg.value.ui64 +=
        from->tcp_fusion_urg;
    to->tcp_fusion_putnext.value.ui64 +=
        from->tcp_fusion_putnext;
    to->tcp_fusion_unfusable.value.ui64 +=
        from->tcp_fusion_unfusable;
    to->tcp_fusion_aborted.value.ui64 +=
        from->tcp_fusion_aborted;
    to->tcp_fusion_unqualified.value.ui64 +=
        from->tcp_fusion_unqualified;
    to->tcp_fusion_rrw_busy.value.ui64 +=
        from->tcp_fusion_rrw_busy;
    to->tcp_fusion_rrw_msgcnt.value.ui64 +=
        from->tcp_fusion_rrw_msgcnt;
    to->tcp_fusion_rrw_plugged.value.ui64 +=
        from->tcp_fusion_rrw_plugged;
    to->tcp_in_ack_unsent_drop.value.ui64 +=
        from->tcp_in_ack_unsent_drop;
    to->tcp_sock_fallback.value.ui64 +=
        from->tcp_sock_fallback;
    to->tcp_lso_enabled.value.ui64 +=
        from->tcp_lso_enabled;
    to->tcp_lso_disabled.value.ui64 +=
        from->tcp_lso_disabled;
    to->tcp_lso_times.value.ui64 +=
        from->tcp_lso_times;
    to->tcp_lso_pkt_out.value.ui64 +=
        from->tcp_lso_pkt_out;
    to->tcp_listen_cnt_drop.value.ui64 +=
        from->tcp_listen_cnt_drop;
    to->tcp_listen_mem_drop.value.ui64 +=
        from->tcp_listen_mem_drop;
    to->tcp_zwin_mem_drop.value.ui64 +=
        from->tcp_zwin_mem_drop;
    to->tcp_zwin_ack_syn.value.ui64 +=
        from->tcp_zwin_ack_syn;
    to->tcp_rst_unsent.value.ui64 +=
        from->tcp_rst_unsent;
    to->tcp_reclaim_cnt.value.ui64 +=
        from->tcp_reclaim_cnt;
    to->tcp_reass_timeout.value.ui64 +=
        from->tcp_reass_timeout;

#ifdef TCP_DEBUG_COUNTER
    to->tcp_time_wait.value.ui64 +=
        from->tcp_time_wait;
    to->tcp_rput_time_wait.value.ui64 +=
        from->tcp_rput_time_wait;
    to->tcp_detach_time_wait.value.ui64 +=
        from->tcp_detach_time_wait;
    to->tcp_timeout_calls.value.ui64 +=
        from->tcp_timeout_calls;
    to->tcp_timeout_cached_alloc.value.ui64 +=
        from->tcp_timeout_cached_alloc;
    to->tcp_timeout_cancel_reqs.value.ui64 +=
        from->tcp_timeout_cancel_reqs;
    to->tcp_timeout_canceled.value.ui64 +=
        from->tcp_timeout_canceled;
    to->tcp_timermp_freed.value.ui64 +=
        from->tcp_timermp_freed;
    to->tcp_push_timer_cnt.value.ui64 +=
        from->tcp_push_timer_cnt;
    to->tcp_ack_timer_cnt.value.ui64 +=
        from->tcp_ack_timer_cnt;
#endif
}