/*      $NetBSD: vtw.c,v 1.13 2022/09/01 10:10:20 msaitoh Exp $ */

/*
* Copyright (c) 2011 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by Coyote Point Systems, Inc.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
*    notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
*    notice, this list of conditions and the following disclaimer in the
*    documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
* BE LIABLE FOR ANY 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)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
/*
* Copyright (c) 1983, 1988, 1993
*      The Regents of the University of California.  All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
*    notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
*    notice, this list of conditions and the following disclaimer in the
*    documentation and/or other materials provided with the distribution.
* 3. Neither the name of the University nor the names of its contributors
*    may be used to endorse or promote products derived from this software
*    without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY 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) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/

#include <sys/cdefs.h>
#ifndef lint
#if 0
static char sccsid[] = "from: @(#)inet.c        8.4 (Berkeley) 4/20/94";
#else
__RCSID("$NetBSD: vtw.c,v 1.13 2022/09/01 10:10:20 msaitoh Exp $");
#endif
#endif /* not lint */

#define _CALLOUT_PRIVATE        /* for defs in sys/callout.h */

#include <sys/param.h>
#include <sys/queue.h>
#include <sys/socket.h>
#include <sys/socketvar.h>
#include <sys/mbuf.h>
#include <sys/protosw.h>
#include <sys/sysctl.h>

#include <net/if_arp.h>
#include <net/route.h>
#include <netinet/in.h>
#include <netinet/in_systm.h>
#include <netinet/ip.h>
#include <netinet/in_pcb.h>
#include <netinet/ip_icmp.h>

#ifdef INET6
#include <netinet/ip6.h>
#endif

#include <netinet/icmp_var.h>
#include <netinet/igmp_var.h>
#include <netinet/ip_var.h>
#include <netinet/pim_var.h>
#include <netinet/tcp.h>
#include <netinet/tcp_seq.h>
#include <netinet/tcp_fsm.h>
#include <netinet/tcp_timer.h>
#include <netinet/tcp_var.h>
#include <netinet/tcp_debug.h>
#include <netinet/udp.h>
#include <netinet/ip_carp.h>
#include <netinet/udp_var.h>
#include <netinet/tcp_vtw.h>

#include <arpa/inet.h>
#include <kvm.h>
#include <netdb.h>
#include <stdio.h>
#include <string.h>
#include <unistd.h>
#include <stdlib.h>
#include <err.h>
#include "netstat.h"
#include "vtw.h"
#include "prog_ops.h"

static bool     vtw_enabled(void);
static void     snarf(const void *, void *, size_t);
static void     *lookup(const char *);
static void     process_vtw(const vtw_ctl_t *, void (*)(const vtw_t *));

static bool
vtw_enabled(void)
{

       if (use_sysctl) {
               int enabled;
               size_t size = sizeof(enabled);

               if (prog_sysctlbyname("net.inet.tcp.vtw.enable",
                   &enabled, &size, NULL, 0) == -1)
                       return true;
               return enabled ? true : false;
       } else
               return true;
}

static void
snarf(const void *addr, void *buf, size_t len)
{
       size_t cc;

       memset(buf, 0, len);

       cc = kvm_read(get_kvmd(), (unsigned long) addr, buf, len);

       if (cc != len) {
               warnx("%s: short read at %p, len %zx cc %zx", __func__, addr,
                   len, cc);
       }
}

static void *
lookup(const char *name)
{
       kvm_t *k;
       struct nlist nl[2];

       nl[0].n_name = name;
       nl[0].n_value = 0;
       nl[1].n_name = NULL;

       if ((k = get_kvmd()) == NULL) {
               if (Vflag)
                       errx(EXIT_FAILURE, "kvm not available");
               return NULL;
       }
       switch (kvm_nlist(k, &nl[0])) {
       case -1:
               err(EXIT_FAILURE, "kvm_nlist");
               break;

       case 0:
               return (void *)nl[0].n_value;

       default:
               if (Vflag)
                       errx(EXIT_FAILURE, "%s missing in symbol table", name);
               break;
       }

       return NULL;
}

void
timebase(struct timeval *tv)
{
       void *p;
       struct bintime timebasebin;

       if (!vtw_enabled()) {
               memset(tv, 0, sizeof(*tv));
               return;
       }

       p = lookup("timebasebin");
       if (!p)
               return;
       snarf(p, &timebasebin, sizeof(timebasebin));
       bintime2timeval(&timebasebin, tv);
}

static void
process_vtw(const vtw_ctl_t * ctl, void (*print)(const vtw_t *))
{
       vtw_t *vp;

       for (vp = ctl->base.v; vp && vp <= ctl->lim.v;) {

               (*print)(vp);

               if (ctl->is_v4) {
                       vtw_v4_t *v4 = (vtw_v4_t *)vp;

                       vp = &(++v4)->common;
               } else if (ctl->is_v6) {
                       vtw_v6_t *v6 = (vtw_v6_t *)vp;

                       vp = &(++v6)->common;
               }
       }
}

void
show_vtw_stats(void)
{
       vtw_stats_t stats;
       void *p;

       if (!Vflag)
               return;

       if (!vtw_enabled())
               return;

       if ((p = lookup("vtw_stats")) == NULL)
               return;
       snarf(p, &stats, sizeof(stats));

       printf("\t\t%" PRIu64 " inserts\n", stats.ins);
       printf("\t\t%" PRIu64 " deletes\n", stats.del);
       printf("\t\t%" PRIu64 " assassinations\n", stats.kill);
       printf("\tvestigial time-wait lookup_connect\n");
       printf("\t\t%" PRIu64 " look\n", stats.look[0]);
       printf("\t\t%" PRIu64 " hit\n", stats.hit[0]);
       printf("\t\t%" PRIu64 " miss\n", stats.miss[0]);
       printf("\t\t%" PRIu64 " probe\n", stats.probe[0]);
       printf("\t\t%" PRIu64 " losing\n", stats.losing[0]);
       printf("\t\t%" PRIu64 " max_chain\n", stats.max_chain[0]);
       printf("\t\t%" PRIu64 " max_probe\n", stats.max_probe[0]);
       printf("\t\t%" PRIu64 " max_loss\n", stats.max_loss[0]);
       printf("\tvestigial time-wait lookup_port\n");
       printf("\t\t%" PRIu64 " look\n", stats.look[1]);
       printf("\t\t%" PRIu64 " hit\n", stats.hit[1]);
       printf("\t\t%" PRIu64 " miss\n", stats.miss[1]);
       printf("\t\t%" PRIu64 " probe\n", stats.probe[1]);
       printf("\t\t%" PRIu64 " losing\n", stats.losing[1]);
       printf("\t\t%" PRIu64 " max_chain\n", stats.max_chain[1]);
       printf("\t\t%" PRIu64 " max_probe\n", stats.max_probe[1]);
       printf("\t\t%" PRIu64 " max_loss\n", stats.max_loss[1]);
}

void
show_vtw_v4(void (*print)(const vtw_t *))
{
       fatp_t *base, *lim;
       fatp_t **hash, **port;
       size_t n;
       fatp_ctl_t fat_tcpv4;
       vtw_ctl_t  vtw_tcpv4[VTW_NCLASS];
       int i;
       int mem = 0;
       void *p;

       if (!vtw_enabled())
               return;

       if ((p = lookup("fat_tcpv4")) == NULL)
               return;
       snarf(p, &fat_tcpv4, sizeof(fat_tcpv4));

       if ((p = lookup("vtw_tcpv4")) == NULL)
               return;
       snarf(p, &vtw_tcpv4[0], sizeof(vtw_tcpv4));

       mem += sizeof(fat_tcpv4);
       mem += sizeof(vtw_tcpv4);

       /* snarf/adjust vtw_ctl */
       for (i = 0; i < VTW_NCLASS; ++i) {
               vtw_v4_t *kbase, *klim;
               vtw_v4_t *ubase;
               ptrdiff_t delta;

               kbase = vtw_tcpv4[i].base.v4;
               klim = vtw_tcpv4[i].lim.v4;

               if (!kbase || !klim)
                       continue;

               n = (klim - kbase + 1);

               if (!i) {
                       ubase = NULL;
                       if (reallocarr(&ubase, n, sizeof(*kbase)) != 0)
                               err(EXIT_FAILURE, "reallocarr");
                       snarf(kbase, ubase, n * sizeof(*ubase));

                       mem += n * sizeof(*ubase);
               } else
                       ubase = vtw_tcpv4[0].base.v4;

               delta = ubase - kbase;

               vtw_tcpv4[i].base.v4 += delta;
               vtw_tcpv4[i].lim.v4 += delta;
               vtw_tcpv4[i].alloc.v4 += delta;
               vtw_tcpv4[i].fat = &fat_tcpv4;

               if (vtw_tcpv4[i].oldest.v4)
                       vtw_tcpv4[i].oldest.v4 += delta;
       }

       /* snarf/adjust fat_ctl */

       base = fat_tcpv4.base;
       lim = fat_tcpv4.lim;

       if (!base || !lim)
               goto end;

       mem += (lim - base + 1) * sizeof(*base);

       fat_tcpv4.base = NULL;
       if (reallocarr(&fat_tcpv4.base, lim - base + 1, sizeof(*base)) != 0)
               err(EXIT_FAILURE, "reallocarr");
       fat_tcpv4.lim = fat_tcpv4.base + (lim - base);

       snarf(base, fat_tcpv4.base, sizeof(*base) * (lim - base + 1));

       fat_tcpv4.vtw = &vtw_tcpv4[0];
       fat_tcpv4.free = fat_tcpv4.base + (fat_tcpv4.free - base);

       n = fat_tcpv4.mask + 1;
       hash = fat_tcpv4.hash;
       port = fat_tcpv4.port;

       fat_tcpv4.hash = NULL;
       if (reallocarr(&fat_tcpv4.hash, n, sizeof(*hash)) != 0)
               err(EXIT_FAILURE, "reallocarr");

       fat_tcpv4.port = NULL;
       if (reallocarr(&fat_tcpv4.port, n, sizeof(*port)) != 0)
               err(EXIT_FAILURE, "reallocarr");

       snarf(hash, fat_tcpv4.hash, n * sizeof(*hash));
       snarf(port, fat_tcpv4.port, n * sizeof(*port));

end:
       process_vtw(&vtw_tcpv4[0], print);

#if 0
       if (Vflag && vflag) {
               printf("total memory for VTW in current config: "
                   "%d bytes %f MB\n",
                   mem, mem / (1024.0 * 1024));
       }
#endif
}

void
show_vtw_v6(void (*print)(const vtw_t *))
{
       fatp_t *base, *lim;
       fatp_t **hash, **port;
       size_t n;
       fatp_ctl_t fat_tcpv6;
       vtw_ctl_t  vtw_tcpv6[VTW_NCLASS];
       int i;
       int mem = 0;
       void *p;

       if (!vtw_enabled())
               return;

       if ((p = lookup("fat_tcpv6")) == NULL)
               return;
       snarf(p, &fat_tcpv6, sizeof(fat_tcpv6));
       if ((p = lookup("vtw_tcpv6")) == NULL)
               return;
       snarf(p, &vtw_tcpv6[0], sizeof(vtw_tcpv6));

       mem += sizeof(fat_tcpv6);
       mem += sizeof(vtw_tcpv6);

       for (i = 0; i < VTW_NCLASS; ++i) {
               vtw_v6_t *kbase, *klim;
               vtw_v6_t *ubase;
               ptrdiff_t delta;

               kbase = vtw_tcpv6[i].base.v6;
               klim = vtw_tcpv6[i].lim.v6;

               if (!kbase || !klim)
                       continue;

               n = (klim - kbase + 1);

               if (!i) {
                       ubase = NULL;
                       if (reallocarr(&ubase, n, sizeof(*kbase)) != 0)
                               err(EXIT_FAILURE, "reallocarr");

                       snarf(kbase, ubase, n * sizeof(*ubase));

                       mem += n * sizeof(*ubase);
               } else
                       ubase = vtw_tcpv6[0].base.v6;

               delta = ubase - kbase;

               vtw_tcpv6[i].base.v6 += delta;
               vtw_tcpv6[i].lim.v6 += delta;
               vtw_tcpv6[i].alloc.v6 += delta;
               vtw_tcpv6[i].fat = &fat_tcpv6;

               if (vtw_tcpv6[i].oldest.v6)
                       vtw_tcpv6[i].oldest.v6 += delta;
       }

       base = fat_tcpv6.base;
       lim = fat_tcpv6.lim;

       if (!base || !lim)
               goto end;

       mem += (lim - base + 1) * sizeof(*base);

       fat_tcpv6.base = NULL;
       if (reallocarr(&fat_tcpv6.base, lim - base + 1, sizeof(*base)) != 0)
               err(EXIT_FAILURE, "reallocarr");

       fat_tcpv6.lim = fat_tcpv6.base + (lim - base);

       snarf(base, fat_tcpv6.base, sizeof(*base) * (lim - base + 1));

       fat_tcpv6.vtw = &vtw_tcpv6[0];
       fat_tcpv6.free = fat_tcpv6.base + (fat_tcpv6.free - base);

       n = fat_tcpv6.mask + 1;
       hash = fat_tcpv6.hash;
       port = fat_tcpv6.port;

       fat_tcpv6.hash = NULL;
       if (reallocarr(&fat_tcpv6.hash, n, sizeof(*hash)) != 0)
               err(EXIT_FAILURE, "reallocarr");

       fat_tcpv6.port = NULL;
       if (reallocarr(&fat_tcpv6.port, n, sizeof(*port)) != 0)
               err(EXIT_FAILURE, "reallocarr");

       snarf(hash, fat_tcpv6.hash, n * sizeof(*hash));
       snarf(port, fat_tcpv6.port, n * sizeof(*port));

end:

       process_vtw(&vtw_tcpv6[0], print);
#if 0
       if (Vflag && vflag) {
               printf("total memory for VTW in current config: "
                   "%d bytes %f MB\n",
                   mem, mem / (1024.0 * 1024));
       }
#endif
}

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