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inet.c

/*-
 * Copyright (c) 1983, 1988, 1993, 1995
 *    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. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *    This product includes software developed by the University of
 *    California, Berkeley and its contributors.
 * 4. 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.
 */

#if 0
#ifndef lint
static char sccsid[] = "@(#)inet.c  8.5 (Berkeley) 5/24/95";
#endif /* not lint */
#endif

#include <sys/cdefs.h>
__FBSDID("$FreeBSD: src/usr.bin/netstat/inet.c,v 1.78.2.4.2.1 2008/11/25 02:59:29 kensmith Exp $");

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

#include <net/route.h>
#include <netinet/in.h>
#include <netinet/in_systm.h>
#include <netinet/ip.h>
#include <netinet/ip_carp.h>
#ifdef INET6
#include <netinet/ip6.h>
#endif /* INET6 */
#include <netinet/in_pcb.h>
#include <netinet/ip_icmp.h>
#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/tcpip.h>
#include <netinet/tcp_seq.h>
#define     TCPSTATES
#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/udp_var.h>

#include <arpa/inet.h>
#include <err.h>
#include <errno.h>
#include <libutil.h>
#include <netdb.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include "netstat.h"

char  *inetname(struct in_addr *);
void  inetprint(struct in_addr *, int, const char *, int);
#ifdef INET6
static int udp_done, tcp_done;
#endif /* INET6 */

static int
pcblist_sysctl(int proto, char **bufp, int istcp)
{
      const char *mibvar;
      char *buf;
      size_t len;

      switch (proto) {
      case IPPROTO_TCP:
            mibvar = "net.inet.tcp.pcblist";
            break;
      case IPPROTO_UDP:
            mibvar = "net.inet.udp.pcblist";
            break;
      case IPPROTO_DIVERT:
            mibvar = "net.inet.divert.pcblist";
            break;
      default:
            mibvar = "net.inet.raw.pcblist";
            break;
      }

      len = 0;
      if (sysctlbyname(mibvar, 0, &len, 0, 0) < 0) {
            if (errno != ENOENT)
                  warn("sysctl: %s", mibvar);
            return (0);
      }
      if ((buf = malloc(len)) == 0) {
            warnx("malloc %lu bytes", (u_long)len);
            return (0);
      }
      if (sysctlbyname(mibvar, buf, &len, 0, 0) < 0) {
            warn("sysctl: %s", mibvar);
            free(buf);
            return (0);
      }
      *bufp = buf;
      return (1);
}

/*
 * Copied directly from uipc_socket2.c.  We leave out some fields that are in
 * nested structures that aren't used to avoid extra work.
 */
static void
sbtoxsockbuf(struct sockbuf *sb, struct xsockbuf *xsb)
{
      xsb->sb_cc = sb->sb_cc;
      xsb->sb_hiwat = sb->sb_hiwat;
      xsb->sb_mbcnt = sb->sb_mbcnt;
      xsb->sb_mbmax = sb->sb_mbmax;
      xsb->sb_lowat = sb->sb_lowat;
      xsb->sb_flags = sb->sb_flags;
      xsb->sb_timeo = sb->sb_timeo;
}

int
sotoxsocket(struct socket *so, struct xsocket *xso)
{
      struct protosw proto;
      struct domain domain;

      bzero(xso, sizeof *xso);
      xso->xso_len = sizeof *xso;
      xso->xso_so = so;
      xso->so_type = so->so_type;
      xso->so_options = so->so_options;
      xso->so_linger = so->so_linger;
      xso->so_state = so->so_state;
      xso->so_pcb = so->so_pcb;
      if (kread((uintptr_t)so->so_proto, &proto, sizeof(proto)) != 0)
            return (-1);
      xso->xso_protocol = proto.pr_protocol;
      if (kread((uintptr_t)proto.pr_domain, &domain, sizeof(domain)) != 0)
            return (-1);
      xso->xso_family = domain.dom_family;
      xso->so_qlen = so->so_qlen;
      xso->so_incqlen = so->so_incqlen;
      xso->so_qlimit = so->so_qlimit;
      xso->so_timeo = so->so_timeo;
      xso->so_error = so->so_error;
      xso->so_oobmark = so->so_oobmark;
      sbtoxsockbuf(&so->so_snd, &xso->so_snd);
      sbtoxsockbuf(&so->so_rcv, &xso->so_rcv);
      return (0);
}

static int
pcblist_kvm(u_long off, char **bufp, int istcp)
{
      struct inpcbinfo pcbinfo;
      struct inpcbhead listhead;
      struct inpcb *inp;
      struct xinpcb xi;
      struct xinpgen xig;
      struct xtcpcb xt;
      struct socket so;
      struct xsocket *xso;
      char *buf, *p;
      size_t len;

      if (off == 0)
            return (0);
      kread(off, &pcbinfo, sizeof(pcbinfo));
      if (istcp)
            len = 2 * sizeof(xig) +
                (pcbinfo.ipi_count + pcbinfo.ipi_count / 8) *
                sizeof(struct xtcpcb);
      else
            len = 2 * sizeof(xig) +
                (pcbinfo.ipi_count + pcbinfo.ipi_count / 8) *
                sizeof(struct xinpcb);
      if ((buf = malloc(len)) == 0) {
            warnx("malloc %lu bytes", (u_long)len);
            return (0);
      }
      p = buf;

#define     COPYOUT(obj, size) do {                               \
      if (len < (size)) {                                   \
            warnx("buffer size exceeded");                        \
            goto fail;                                \
      }                                               \
      bcopy((obj), p, (size));                              \
      len -= (size);                                        \
      p += (size);                                          \
} while (0)

#define     KREAD(off, buf, len) do {                             \
      if (kread((uintptr_t)(off), (buf), (len)) != 0)             \
            goto fail;                                \
} while (0)

      /* Write out header. */
      xig.xig_len = sizeof xig;
      xig.xig_count = pcbinfo.ipi_count;
      xig.xig_gen = pcbinfo.ipi_gencnt;
      xig.xig_sogen = 0;
      COPYOUT(&xig, sizeof xig);

      /* Walk the PCB list. */
      xt.xt_len = sizeof xt;
      xi.xi_len = sizeof xi;
      if (istcp)
            xso = &xt.xt_socket;
      else
            xso = &xi.xi_socket;
      KREAD(pcbinfo.ipi_listhead, &listhead, sizeof(listhead));
      LIST_FOREACH(inp, &listhead, inp_list) {
            if (istcp) {
                  KREAD(inp, &xt.xt_inp, sizeof(*inp));
                  inp = &xt.xt_inp;
            } else {
                  KREAD(inp, &xi.xi_inp, sizeof(*inp));
                  inp = &xi.xi_inp;
            }

            if (inp->inp_gencnt > pcbinfo.ipi_gencnt)
                  continue;

            if (istcp) {
                  if (inp->inp_ppcb == NULL)
                        bzero(&xt.xt_tp, sizeof xt.xt_tp);
                  else if (inp->inp_vflag & INP_TIMEWAIT) {
                        bzero(&xt.xt_tp, sizeof xt.xt_tp);
                        xt.xt_tp.t_state = TCPS_TIME_WAIT;
                  } else
                        KREAD(inp->inp_ppcb, &xt.xt_tp,
                            sizeof xt.xt_tp);
            }
            if (inp->inp_socket) {
                  KREAD(inp->inp_socket, &so, sizeof(so));
                  if (sotoxsocket(&so, xso) != 0)
                        goto fail;
            } else {
                  bzero(xso, sizeof(*xso));
                  if (istcp)
                        xso->xso_protocol = IPPROTO_TCP;
            }
            if (istcp)
                  COPYOUT(&xt, sizeof xt);
            else
                  COPYOUT(&xi, sizeof xi);
      }

      /* Reread the pcbinfo and write out the footer. */
      kread(off, &pcbinfo, sizeof(pcbinfo));
      xig.xig_count = pcbinfo.ipi_count;
      xig.xig_gen = pcbinfo.ipi_gencnt;
      COPYOUT(&xig, sizeof xig);

      *bufp = buf;
      return (1);

fail:
      free(buf);
      return (0);
#undef COPYOUT
#undef KREAD
}

/*
 * Print a summary of connections related to an Internet
 * protocol.  For TCP, also give state of connection.
 * Listening processes (aflag) are suppressed unless the
 * -a (all) flag is specified.
 */
void
protopr(u_long off, const char *name, int af1, int proto)
{
      int istcp;
      static int first = 1;
      char *buf;
      const char *vchar;
      struct tcpcb *tp = NULL;
      struct inpcb *inp;
      struct xinpgen *xig, *oxig;
      struct xsocket *so;

      istcp = 0;
      switch (proto) {
      case IPPROTO_TCP:
#ifdef INET6
            if (tcp_done != 0)
                  return;
            else
                  tcp_done = 1;
#endif
            istcp = 1;
            break;
      case IPPROTO_UDP:
#ifdef INET6
            if (udp_done != 0)
                  return;
            else
                  udp_done = 1;
#endif
            break;
      }
      if (live) {
            if (!pcblist_sysctl(proto, &buf, istcp))
                  return;
      } else {
            if (!pcblist_kvm(off, &buf, istcp))
                  return;
      }

      oxig = xig = (struct xinpgen *)buf;
      for (xig = (struct xinpgen *)((char *)xig + xig->xig_len);
           xig->xig_len > sizeof(struct xinpgen);
           xig = (struct xinpgen *)((char *)xig + xig->xig_len)) {
            if (istcp) {
                  tp = &((struct xtcpcb *)xig)->xt_tp;
                  inp = &((struct xtcpcb *)xig)->xt_inp;
                  so = &((struct xtcpcb *)xig)->xt_socket;
            } else {
                  inp = &((struct xinpcb *)xig)->xi_inp;
                  so = &((struct xinpcb *)xig)->xi_socket;
            }

            /* Ignore sockets for protocols other than the desired one. */
            if (so->xso_protocol != proto)
                  continue;

            /* Ignore PCBs which were freed during copyout. */
            if (inp->inp_gencnt > oxig->xig_gen)
                  continue;

            if ((af1 == AF_INET && (inp->inp_vflag & INP_IPV4) == 0)
#ifdef INET6
                || (af1 == AF_INET6 && (inp->inp_vflag & INP_IPV6) == 0)
#endif /* INET6 */
                || (af1 == AF_UNSPEC && ((inp->inp_vflag & INP_IPV4) == 0
#ifdef INET6
                                && (inp->inp_vflag & INP_IPV6) == 0
#endif /* INET6 */
                  ))
                )
                  continue;
            if (!aflag &&
                (
                 (istcp && tp->t_state == TCPS_LISTEN)
                 || (af1 == AF_INET &&
                  inet_lnaof(inp->inp_laddr) == INADDR_ANY)
#ifdef INET6
                 || (af1 == AF_INET6 &&
                   IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr))
#endif /* INET6 */
                 || (af1 == AF_UNSPEC &&
                   (((inp->inp_vflag & INP_IPV4) != 0 &&
                     inet_lnaof(inp->inp_laddr) == INADDR_ANY)
#ifdef INET6
                    || ((inp->inp_vflag & INP_IPV6) != 0 &&
                        IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr))
#endif
                    ))
                 ))
                  continue;

            if (first) {
                  if (!Lflag) {
                        printf("Active Internet connections");
                        if (aflag)
                              printf(" (including servers)");
                  } else
                        printf(
      "Current listen queue sizes (qlen/incqlen/maxqlen)");
                  putchar('\n');
                  if (Aflag)
                        printf("%-8.8s ", "Tcpcb");
                  if (Lflag)
                        printf("%-5.5s %-14.14s %-22.22s\n",
                            "Proto", "Listen", "Local Address");
                  else
                        printf((Aflag && !Wflag) ?
            "%-5.5s %-6.6s %-6.6s  %-18.18s %-18.18s %s\n" :
            "%-5.5s %-6.6s %-6.6s  %-22.22s %-22.22s %s\n",
                            "Proto", "Recv-Q", "Send-Q",
                            "Local Address", "Foreign Address",
                            "(state)");
                  first = 0;
            }
            if (Lflag && so->so_qlimit == 0)
                  continue;
            if (Aflag) {
                  if (istcp)
                        printf("%8lx ", (u_long)inp->inp_ppcb);
                  else
                        printf("%8lx ", (u_long)so->so_pcb);
            }
#ifdef INET6
            if ((inp->inp_vflag & INP_IPV6) != 0)
                  vchar = ((inp->inp_vflag & INP_IPV4) != 0) ?
                      "46" : "6 ";
            else
#endif
            vchar = ((inp->inp_vflag & INP_IPV4) != 0) ?
                "4 " : "  ";
            printf("%-3.3s%-2.2s ", name, vchar);
            if (Lflag) {
                  char buf1[15];

                  snprintf(buf1, 15, "%d/%d/%d", so->so_qlen,
                      so->so_incqlen, so->so_qlimit);
                  printf("%-14.14s ", buf1);
            } else {
                  printf("%6u %6u ", so->so_rcv.sb_cc, so->so_snd.sb_cc);
            }
            if (numeric_port) {
                  if (inp->inp_vflag & INP_IPV4) {
                        inetprint(&inp->inp_laddr, (int)inp->inp_lport,
                            name, 1);
                        if (!Lflag)
                              inetprint(&inp->inp_faddr,
                                  (int)inp->inp_fport, name, 1);
                  }
#ifdef INET6
                  else if (inp->inp_vflag & INP_IPV6) {
                        inet6print(&inp->in6p_laddr,
                            (int)inp->inp_lport, name, 1);
                        if (!Lflag)
                              inet6print(&inp->in6p_faddr,
                                  (int)inp->inp_fport, name, 1);
                  } /* else nothing printed now */
#endif /* INET6 */
            } else if (inp->inp_flags & INP_ANONPORT) {
                  if (inp->inp_vflag & INP_IPV4) {
                        inetprint(&inp->inp_laddr, (int)inp->inp_lport,
                            name, 1);
                        if (!Lflag)
                              inetprint(&inp->inp_faddr,
                                  (int)inp->inp_fport, name, 0);
                  }
#ifdef INET6
                  else if (inp->inp_vflag & INP_IPV6) {
                        inet6print(&inp->in6p_laddr,
                            (int)inp->inp_lport, name, 1);
                        if (!Lflag)
                              inet6print(&inp->in6p_faddr,
                                  (int)inp->inp_fport, name, 0);
                  } /* else nothing printed now */
#endif /* INET6 */
            } else {
                  if (inp->inp_vflag & INP_IPV4) {
                        inetprint(&inp->inp_laddr, (int)inp->inp_lport,
                            name, 0);
                        if (!Lflag)
                              inetprint(&inp->inp_faddr,
                                  (int)inp->inp_fport, name,
                                  inp->inp_lport != inp->inp_fport);
                  }
#ifdef INET6
                  else if (inp->inp_vflag & INP_IPV6) {
                        inet6print(&inp->in6p_laddr,
                            (int)inp->inp_lport, name, 0);
                        if (!Lflag)
                              inet6print(&inp->in6p_faddr,
                                  (int)inp->inp_fport, name,
                                  inp->inp_lport != inp->inp_fport);
                  } /* else nothing printed now */
#endif /* INET6 */
            }
            if (istcp && !Lflag) {
                  if (tp->t_state < 0 || tp->t_state >= TCP_NSTATES)
                        printf("%d", tp->t_state);
                      else {
                        printf("%s", tcpstates[tp->t_state]);
#if defined(TF_NEEDSYN) && defined(TF_NEEDFIN)
                        /* Show T/TCP `hidden state' */
                        if (tp->t_flags & (TF_NEEDSYN|TF_NEEDFIN))
                              putchar('*');
#endif /* defined(TF_NEEDSYN) && defined(TF_NEEDFIN) */
                  }
            }
            putchar('\n');
      }
      if (xig != oxig && xig->xig_gen != oxig->xig_gen) {
            if (oxig->xig_count > xig->xig_count) {
                  printf("Some %s sockets may have been deleted.\n",
                      name);
            } else if (oxig->xig_count < xig->xig_count) {
                  printf("Some %s sockets may have been created.\n",
                      name);
            } else {
                  printf(
      "Some %s sockets may have been created or deleted.\n",
                      name);
            }
      }
      free(buf);
}

/*
 * Dump TCP statistics structure.
 */
void
tcp_stats(u_long off, const char *name, int af1 __unused, int proto __unused)
{
      struct tcpstat tcpstat, zerostat;
      size_t len = sizeof tcpstat;

#ifdef INET6
      if (tcp_done != 0)
            return;
      else
            tcp_done = 1;
#endif

      if (live) {
            if (zflag)
                  memset(&zerostat, 0, len);
            if (sysctlbyname("net.inet.tcp.stats", &tcpstat, &len,
                zflag ? &zerostat : NULL, zflag ? len : 0) < 0) {
                  warn("sysctl: net.inet.tcp.stats");
                  return;
            }
      } else
            kread(off, &tcpstat, len);

      printf ("%s:\n", name);

#define     p(f, m) if (tcpstat.f || sflag <= 1) \
    printf(m, tcpstat.f, plural(tcpstat.f))
#define     p1a(f, m) if (tcpstat.f || sflag <= 1) \
    printf(m, tcpstat.f)
#define     p2(f1, f2, m) if (tcpstat.f1 || tcpstat.f2 || sflag <= 1) \
    printf(m, tcpstat.f1, plural(tcpstat.f1), tcpstat.f2, plural(tcpstat.f2))
#define     p2a(f1, f2, m) if (tcpstat.f1 || tcpstat.f2 || sflag <= 1) \
    printf(m, tcpstat.f1, plural(tcpstat.f1), tcpstat.f2)
#define     p3(f, m) if (tcpstat.f || sflag <= 1) \
    printf(m, tcpstat.f, pluralies(tcpstat.f))

      p(tcps_sndtotal, "\t%lu packet%s sent\n");
      p2(tcps_sndpack,tcps_sndbyte, "\t\t%lu data packet%s (%lu byte%s)\n");
      p2(tcps_sndrexmitpack, tcps_sndrexmitbyte,
          "\t\t%lu data packet%s (%lu byte%s) retransmitted\n");
      p(tcps_sndrexmitbad,
          "\t\t%lu data packet%s unnecessarily retransmitted\n");
      p(tcps_mturesent, "\t\t%lu resend%s initiated by MTU discovery\n");
      p2a(tcps_sndacks, tcps_delack,
          "\t\t%lu ack-only packet%s (%lu delayed)\n");
      p(tcps_sndurg, "\t\t%lu URG only packet%s\n");
      p(tcps_sndprobe, "\t\t%lu window probe packet%s\n");
      p(tcps_sndwinup, "\t\t%lu window update packet%s\n");
      p(tcps_sndctrl, "\t\t%lu control packet%s\n");
      p(tcps_rcvtotal, "\t%lu packet%s received\n");
      p2(tcps_rcvackpack, tcps_rcvackbyte,
          "\t\t%lu ack%s (for %lu byte%s)\n");
      p(tcps_rcvdupack, "\t\t%lu duplicate ack%s\n");
      p(tcps_rcvacktoomuch, "\t\t%lu ack%s for unsent data\n");
      p2(tcps_rcvpack, tcps_rcvbyte,
          "\t\t%lu packet%s (%lu byte%s) received in-sequence\n");
      p2(tcps_rcvduppack, tcps_rcvdupbyte,
          "\t\t%lu completely duplicate packet%s (%lu byte%s)\n");
      p(tcps_pawsdrop, "\t\t%lu old duplicate packet%s\n");
      p2(tcps_rcvpartduppack, tcps_rcvpartdupbyte,
          "\t\t%lu packet%s with some dup. data (%lu byte%s duped)\n");
      p2(tcps_rcvoopack, tcps_rcvoobyte,
          "\t\t%lu out-of-order packet%s (%lu byte%s)\n");
      p2(tcps_rcvpackafterwin, tcps_rcvbyteafterwin,
          "\t\t%lu packet%s (%lu byte%s) of data after window\n");
      p(tcps_rcvwinprobe, "\t\t%lu window probe%s\n");
      p(tcps_rcvwinupd, "\t\t%lu window update packet%s\n");
      p(tcps_rcvafterclose, "\t\t%lu packet%s received after close\n");
      p(tcps_rcvbadsum, "\t\t%lu discarded for bad checksum%s\n");
      p(tcps_rcvbadoff, "\t\t%lu discarded for bad header offset field%s\n");
      p1a(tcps_rcvshort, "\t\t%lu discarded because packet too short\n");
      p1a(tcps_rcvmemdrop, "\t\t%lu discarded due to memory problems\n");
      p(tcps_connattempt, "\t%lu connection request%s\n");
      p(tcps_accepts, "\t%lu connection accept%s\n");
      p(tcps_badsyn, "\t%lu bad connection attempt%s\n");
      p(tcps_listendrop, "\t%lu listen queue overflow%s\n");
      p(tcps_badrst, "\t%lu ignored RSTs in the window%s\n");
      p(tcps_connects, "\t%lu connection%s established (including accepts)\n");
      p2(tcps_closed, tcps_drops,
          "\t%lu connection%s closed (including %lu drop%s)\n");
      p(tcps_cachedrtt, "\t\t%lu connection%s updated cached RTT on close\n");
      p(tcps_cachedrttvar,
          "\t\t%lu connection%s updated cached RTT variance on close\n");
      p(tcps_cachedssthresh,
          "\t\t%lu connection%s updated cached ssthresh on close\n");
      p(tcps_conndrops, "\t%lu embryonic connection%s dropped\n");
      p2(tcps_rttupdated, tcps_segstimed,
          "\t%lu segment%s updated rtt (of %lu attempt%s)\n");
      p(tcps_rexmttimeo, "\t%lu retransmit timeout%s\n");
      p(tcps_timeoutdrop, "\t\t%lu connection%s dropped by rexmit timeout\n");
      p(tcps_persisttimeo, "\t%lu persist timeout%s\n");
      p(tcps_persistdrop, "\t\t%lu connection%s dropped by persist timeout\n");
      p(tcps_finwait2_drops,
          "\t%lu Connection%s (fin_wait_2) dropped because of timeout\n");
      p(tcps_keeptimeo, "\t%lu keepalive timeout%s\n");
      p(tcps_keepprobe, "\t\t%lu keepalive probe%s sent\n");
      p(tcps_keepdrops, "\t\t%lu connection%s dropped by keepalive\n");
      p(tcps_predack, "\t%lu correct ACK header prediction%s\n");
      p(tcps_preddat, "\t%lu correct data packet header prediction%s\n");

      p3(tcps_sc_added, "\t%lu syncache entr%s added\n");
      p1a(tcps_sc_retransmitted, "\t\t%lu retransmitted\n");
      p1a(tcps_sc_dupsyn, "\t\t%lu dupsyn\n");
      p1a(tcps_sc_dropped, "\t\t%lu dropped\n");
      p1a(tcps_sc_completed, "\t\t%lu completed\n");
      p1a(tcps_sc_bucketoverflow, "\t\t%lu bucket overflow\n");
      p1a(tcps_sc_cacheoverflow, "\t\t%lu cache overflow\n");
      p1a(tcps_sc_reset, "\t\t%lu reset\n");
      p1a(tcps_sc_stale, "\t\t%lu stale\n");
      p1a(tcps_sc_aborted, "\t\t%lu aborted\n");
      p1a(tcps_sc_badack, "\t\t%lu badack\n");
      p1a(tcps_sc_unreach, "\t\t%lu unreach\n");
      p(tcps_sc_zonefail, "\t\t%lu zone failure%s\n");
      p(tcps_sc_sendcookie, "\t%lu cookie%s sent\n");
      p(tcps_sc_recvcookie, "\t%lu cookie%s received\n");

      p(tcps_sack_recovery_episode, "\t%lu SACK recovery episode%s\n");
      p(tcps_sack_rexmits,
          "\t%lu segment rexmit%s in SACK recovery episodes\n");
      p(tcps_sack_rexmit_bytes,
          "\t%lu byte rexmit%s in SACK recovery episodes\n");
      p(tcps_sack_rcv_blocks,
          "\t%lu SACK option%s (SACK blocks) received\n");
      p(tcps_sack_send_blocks, "\t%lu SACK option%s (SACK blocks) sent\n");
      p1a(tcps_sack_sboverflow, "\t%lu SACK scoreboard overflow\n");

#undef p
#undef p1a
#undef p2
#undef p2a
#undef p3
}

/*
 * Dump UDP statistics structure.
 */
void
udp_stats(u_long off, const char *name, int af1 __unused, int proto __unused)
{
      struct udpstat udpstat, zerostat;
      size_t len = sizeof udpstat;
      u_long delivered;

#ifdef INET6
      if (udp_done != 0)
            return;
      else
            udp_done = 1;
#endif

      if (live) {
            if (zflag)
                  memset(&zerostat, 0, len);
            if (sysctlbyname("net.inet.udp.stats", &udpstat, &len,
                zflag ? &zerostat : NULL, zflag ? len : 0) < 0) {
                  warn("sysctl: net.inet.udp.stats");
                  return;
            }
      } else
            kread(off, &udpstat, len);

      printf("%s:\n", name);
#define     p(f, m) if (udpstat.f || sflag <= 1) \
    printf(m, udpstat.f, plural(udpstat.f))
#define     p1a(f, m) if (udpstat.f || sflag <= 1) \
    printf(m, udpstat.f)
      p(udps_ipackets, "\t%lu datagram%s received\n");
      p1a(udps_hdrops, "\t%lu with incomplete header\n");
      p1a(udps_badlen, "\t%lu with bad data length field\n");
      p1a(udps_badsum, "\t%lu with bad checksum\n");
      p1a(udps_nosum, "\t%lu with no checksum\n");
      p1a(udps_noport, "\t%lu dropped due to no socket\n");
      p(udps_noportbcast,
          "\t%lu broadcast/multicast datagram%s undelivered\n");
      p1a(udps_fullsock, "\t%lu dropped due to full socket buffers\n");
      p1a(udpps_pcbhashmiss, "\t%lu not for hashed pcb\n");
      delivered = udpstat.udps_ipackets -
                udpstat.udps_hdrops -
                udpstat.udps_badlen -
                udpstat.udps_badsum -
                udpstat.udps_noport -
                udpstat.udps_noportbcast -
                udpstat.udps_fullsock;
      if (delivered || sflag <= 1)
            printf("\t%lu delivered\n", delivered);
      p(udps_opackets, "\t%lu datagram%s output\n");
      /* the next statistic is cumulative in udps_noportbcast */
      p(udps_filtermcast,
          "\t%lu time%s multicast source filter matched\n");
#undef p
#undef p1a
}

/*
 * Dump CARP statistics structure.
 */
void
carp_stats(u_long off, const char *name, int af1 __unused, int proto __unused)
{
      struct carpstats carpstat, zerostat;
      size_t len = sizeof(struct carpstats);

      if (live) {
            if (zflag)
                  memset(&zerostat, 0, len);
            if (sysctlbyname("net.inet.carp.stats", &carpstat, &len,
                zflag ? &zerostat : NULL, zflag ? len : 0) < 0) {
                  if (errno != ENOENT)
                        warn("sysctl: net.inet.carp.stats");
                  return;
            }
      } else {
            if (off == 0)
                  return;
            kread(off, &carpstat, len);
      }

      printf("%s:\n", name);

#define     p(f, m) if (carpstat.f || sflag <= 1) \
      printf(m, (uintmax_t)carpstat.f, plural(carpstat.f))
#define     p2(f, m) if (carpstat.f || sflag <= 1) \
      printf(m, (uintmax_t)carpstat.f)

      p(carps_ipackets, "\t%ju packet%s received (IPv4)\n");
      p(carps_ipackets6, "\t%ju packet%s received (IPv6)\n");
      p(carps_badttl, "\t\t%ju packet%s discarded for wrong TTL\n");
      p(carps_hdrops, "\t\t%ju packet%s shorter than header\n");
      p(carps_badsum, "\t\t%ju discarded for bad checksum%s\n");
      p(carps_badver,   "\t\t%ju discarded packet%s with a bad version\n");
      p2(carps_badlen, "\t\t%ju discarded because packet too short\n");
      p2(carps_badauth, "\t\t%ju discarded for bad authentication\n");
      p2(carps_badvhid, "\t\t%ju discarded for bad vhid\n");
      p2(carps_badaddrs, "\t\t%ju discarded because of a bad address list\n");
      p(carps_opackets, "\t%ju packet%s sent (IPv4)\n");
      p(carps_opackets6, "\t%ju packet%s sent (IPv6)\n");
      p2(carps_onomem, "\t\t%ju send failed due to mbuf memory error\n");
#if notyet
      p(carps_ostates, "\t\t%s state update%s sent\n");
#endif
#undef p
#undef p2
}

/*
 * Dump IP statistics structure.
 */
void
ip_stats(u_long off, const char *name, int af1 __unused, int proto __unused)
{
      struct ipstat ipstat, zerostat;
      size_t len = sizeof ipstat;

      if (live) {
            if (zflag)
                  memset(&zerostat, 0, len);
            if (sysctlbyname("net.inet.ip.stats", &ipstat, &len,
                zflag ? &zerostat : NULL, zflag ? len : 0) < 0) {
                  warn("sysctl: net.inet.ip.stats");
                  return;
            }
      } else
            kread(off, &ipstat, len);

      printf("%s:\n", name);

#define     p(f, m) if (ipstat.f || sflag <= 1) \
    printf(m, ipstat.f, plural(ipstat.f))
#define     p1a(f, m) if (ipstat.f || sflag <= 1) \
    printf(m, ipstat.f)

      p(ips_total, "\t%lu total packet%s received\n");
      p(ips_badsum, "\t%lu bad header checksum%s\n");
      p1a(ips_toosmall, "\t%lu with size smaller than minimum\n");
      p1a(ips_tooshort, "\t%lu with data size < data length\n");
      p1a(ips_toolong, "\t%lu with ip length > max ip packet size\n");
      p1a(ips_badhlen, "\t%lu with header length < data size\n");
      p1a(ips_badlen, "\t%lu with data length < header length\n");
      p1a(ips_badoptions, "\t%lu with bad options\n");
      p1a(ips_badvers, "\t%lu with incorrect version number\n");
      p(ips_fragments, "\t%lu fragment%s received\n");
      p(ips_fragdropped, "\t%lu fragment%s dropped (dup or out of space)\n");
      p(ips_fragtimeout, "\t%lu fragment%s dropped after timeout\n");
      p(ips_reassembled, "\t%lu packet%s reassembled ok\n");
      p(ips_delivered, "\t%lu packet%s for this host\n");
      p(ips_noproto, "\t%lu packet%s for unknown/unsupported protocol\n");
      p(ips_forward, "\t%lu packet%s forwarded");
      p(ips_fastforward, " (%lu packet%s fast forwarded)");
      if (ipstat.ips_forward || sflag <= 1)
            putchar('\n');
      p(ips_cantforward, "\t%lu packet%s not forwardable\n");
      p(ips_notmember,
          "\t%lu packet%s received for unknown multicast group\n");
      p(ips_redirectsent, "\t%lu redirect%s sent\n");
      p(ips_localout, "\t%lu packet%s sent from this host\n");
      p(ips_rawout, "\t%lu packet%s sent with fabricated ip header\n");
      p(ips_odropped,
          "\t%lu output packet%s dropped due to no bufs, etc.\n");
      p(ips_noroute, "\t%lu output packet%s discarded due to no route\n");
      p(ips_fragmented, "\t%lu output datagram%s fragmented\n");
      p(ips_ofragments, "\t%lu fragment%s created\n");
      p(ips_cantfrag, "\t%lu datagram%s that can't be fragmented\n");
      p(ips_nogif, "\t%lu tunneling packet%s that can't find gif\n");
      p(ips_badaddr, "\t%lu datagram%s with bad address in header\n");
#undef p
#undef p1a
}

static      const char *icmpnames[ICMP_MAXTYPE + 1] = {
      "echo reply",                 /* RFC 792 */
      "#1",
      "#2",
      "destination unreachable",    /* RFC 792 */
      "source quench",        /* RFC 792 */
      "routing redirect",           /* RFC 792 */
      "#6",
      "#7",
      "echo",                       /* RFC 792 */
      "router advertisement",       /* RFC 1256 */
      "router solicitation",        /* RFC 1256 */
      "time exceeded",        /* RFC 792 */
      "parameter problem",          /* RFC 792 */
      "time stamp",                 /* RFC 792 */
      "time stamp reply",           /* RFC 792 */
      "information request",        /* RFC 792 */
      "information request reply",  /* RFC 792 */
      "address mask request",       /* RFC 950 */
      "address mask reply",         /* RFC 950 */
      "#19",
      "#20",
      "#21",
      "#22",
      "#23",
      "#24",
      "#25",
      "#26",
      "#27",
      "#28",
      "#29",
      "icmp traceroute",            /* RFC 1393 */
      "datagram conversion error",  /* RFC 1475 */
      "mobile host redirect",
      "IPv6 where-are-you",
      "IPv6 i-am-here",
      "mobile registration req",
      "mobile registration reply",
      "domain name request",        /* RFC 1788 */
      "domain name reply",          /* RFC 1788 */
      "icmp SKIP",
      "icmp photuris",        /* RFC 2521 */
};

/*
 * Dump ICMP statistics.
 */
void
icmp_stats(u_long off, const char *name, int af1 __unused, int proto __unused)
{
      struct icmpstat icmpstat, zerostat;
      int i, first;
      size_t len;

      len = sizeof icmpstat;
      if (live) {
            if (zflag)
                  memset(&zerostat, 0, len);
            if (sysctlbyname("net.inet.icmp.stats", &icmpstat, &len,
                zflag ? &zerostat : NULL, zflag ? len : 0) < 0) {
                  warn("sysctl: net.inet.icmp.stats");
                  return;
            }
      } else
            kread(off, &icmpstat, len);

      printf("%s:\n", name);

#define     p(f, m) if (icmpstat.f || sflag <= 1) \
    printf(m, icmpstat.f, plural(icmpstat.f))
#define     p1a(f, m) if (icmpstat.f || sflag <= 1) \
    printf(m, icmpstat.f)
#define     p2(f, m) if (icmpstat.f || sflag <= 1) \
    printf(m, icmpstat.f, plurales(icmpstat.f))

      p(icps_error, "\t%lu call%s to icmp_error\n");
      p(icps_oldicmp,
          "\t%lu error%s not generated in response to an icmp message\n");
      for (first = 1, i = 0; i < ICMP_MAXTYPE + 1; i++)
            if (icmpstat.icps_outhist[i] != 0) {
                  if (first) {
                        printf("\tOutput histogram:\n");
                        first = 0;
                  }
                  if (icmpnames[i] != NULL)
                        printf("\t\t%s: %lu\n", icmpnames[i],
                              icmpstat.icps_outhist[i]);
                  else
                        printf("\t\tunknown ICMP #%d: %lu\n", i,
                              icmpstat.icps_outhist[i]);
            }
      p(icps_badcode, "\t%lu message%s with bad code fields\n");
      p(icps_tooshort, "\t%lu message%s less than the minimum length\n");
      p(icps_checksum, "\t%lu message%s with bad checksum\n");
      p(icps_badlen, "\t%lu message%s with bad length\n");
      p1a(icps_bmcastecho, "\t%lu multicast echo requests ignored\n");
      p1a(icps_bmcasttstamp, "\t%lu multicast timestamp requests ignored\n");
      for (first = 1, i = 0; i < ICMP_MAXTYPE + 1; i++)
            if (icmpstat.icps_inhist[i] != 0) {
                  if (first) {
                        printf("\tInput histogram:\n");
                        first = 0;
                  }
                  if (icmpnames[i] != NULL)
                        printf("\t\t%s: %lu\n", icmpnames[i],
                            icmpstat.icps_inhist[i]);
                  else
                        printf("\t\tunknown ICMP #%d: %lu\n", i,
                            icmpstat.icps_inhist[i]);
            }
      p(icps_reflect, "\t%lu message response%s generated\n");
      p2(icps_badaddr, "\t%lu invalid return address%s\n");
      p(icps_noroute, "\t%lu no return route%s\n");
#undef p
#undef p1a
#undef p2
      if (live) {
            len = sizeof i;
            if (sysctlbyname("net.inet.icmp.maskrepl", &i, &len, NULL, 0) <
                0)
                  return;
            printf("\tICMP address mask responses are %sabled\n",
                i ? "en" : "dis");
      }
}

/*
 * Dump IGMP statistics structure.
 */
void
igmp_stats(u_long off, const char *name, int af1 __unused, int proto __unused)
{
      struct igmpstat igmpstat, zerostat;
      size_t len = sizeof igmpstat;

      if (live) {
            if (zflag)
                  memset(&zerostat, 0, len);
            if (sysctlbyname("net.inet.igmp.stats", &igmpstat, &len,
                zflag ? &zerostat : NULL, zflag ? len : 0) < 0) {
                  warn("sysctl: net.inet.igmp.stats");
                  return;
            }
      } else
            kread(off, &igmpstat, len);

      printf("%s:\n", name);

#define     p(f, m) if (igmpstat.f || sflag <= 1) \
    printf(m, igmpstat.f, plural(igmpstat.f))
#define     py(f, m) if (igmpstat.f || sflag <= 1) \
    printf(m, igmpstat.f, igmpstat.f != 1 ? "ies" : "y")
      p(igps_rcv_total, "\t%u message%s received\n");
      p(igps_rcv_tooshort, "\t%u message%s received with too few bytes\n");
      p(igps_rcv_badsum, "\t%u message%s received with bad checksum\n");
      py(igps_rcv_queries, "\t%u membership quer%s received\n");
      py(igps_rcv_badqueries,
          "\t%u membership quer%s received with invalid field(s)\n");
      p(igps_rcv_reports, "\t%u membership report%s received\n");
      p(igps_rcv_badreports,
          "\t%u membership report%s received with invalid field(s)\n");
      p(igps_rcv_ourreports,
"\t%u membership report%s received for groups to which we belong\n");
        p(igps_snd_reports, "\t%u membership report%s sent\n");
#undef p
#undef py
}

/*
 * Dump PIM statistics structure.
 */
void
pim_stats(u_long off __unused, const char *name, int af1 __unused,
    int proto __unused)
{
      struct pimstat pimstat, zerostat;
      size_t len = sizeof pimstat;

      if (live) {
            if (zflag)
                  memset(&zerostat, 0, len);
            if (sysctlbyname("net.inet.pim.stats", &pimstat, &len,
                zflag ? &zerostat : NULL, zflag ? len : 0) < 0) {
                  if (errno != ENOENT)
                        warn("sysctl: net.inet.pim.stats");
                  return;
            }
      } else {
            if (off == 0)
                  return;
            kread(off, &pimstat, len);
      }

      printf("%s:\n", name);

#define     p(f, m) if (pimstat.f || sflag <= 1) \
    printf(m, (uintmax_t)pimstat.f, plural(pimstat.f))
#define     py(f, m) if (pimstat.f || sflag <= 1) \
    printf(m, (uintmax_t)pimstat.f, pimstat.f != 1 ? "ies" : "y")
      p(pims_rcv_total_msgs, "\t%ju message%s received\n");
      p(pims_rcv_total_bytes, "\t%ju byte%s received\n");
      p(pims_rcv_tooshort, "\t%ju message%s received with too few bytes\n");
        p(pims_rcv_badsum, "\t%ju message%s received with bad checksum\n");
      p(pims_rcv_badversion, "\t%ju message%s received with bad version\n");
      p(pims_rcv_registers_msgs, "\t%ju data register message%s received\n");
      p(pims_rcv_registers_bytes, "\t%ju data register byte%s received\n");
      p(pims_rcv_registers_wrongiif,
          "\t%ju data register message%s received on wrong iif\n");
      p(pims_rcv_badregisters, "\t%ju bad register%s received\n");
      p(pims_snd_registers_msgs, "\t%ju data register message%s sent\n");
      p(pims_snd_registers_bytes, "\t%ju data register byte%s sent\n");
#undef p
#undef py
}

/*
 * Pretty print an Internet address (net address + port).
 */
void
inetprint(struct in_addr *in, int port, const char *proto, int num_port)
{
      struct servent *sp = 0;
      char line[80], *cp;
      int width;

      if (Wflag)
          sprintf(line, "%s.", inetname(in));
      else
          sprintf(line, "%.*s.", (Aflag && !num_port) ? 12 : 16, inetname(in));
      cp = index(line, '\0');
      if (!num_port && port)
            sp = getservbyport((int)port, proto);
      if (sp || port == 0)
            sprintf(cp, "%.15s ", sp ? sp->s_name : "*");
      else
            sprintf(cp, "%d ", ntohs((u_short)port));
      width = (Aflag && !Wflag) ? 18 : 22;
      if (Wflag)
          printf("%-*s ", width, line);
      else
          printf("%-*.*s ", width, width, line);
}

/*
 * Construct an Internet address representation.
 * If numeric_addr has been supplied, give
 * numeric value, otherwise try for symbolic name.
 */
char *
inetname(struct in_addr *inp)
{
      char *cp;
      static char line[MAXHOSTNAMELEN];
      struct hostent *hp;
      struct netent *np;

      cp = 0;
      if (!numeric_addr && inp->s_addr != INADDR_ANY) {
            int net = inet_netof(*inp);
            int lna = inet_lnaof(*inp);

            if (lna == INADDR_ANY) {
                  np = getnetbyaddr(net, AF_INET);
                  if (np)
                        cp = np->n_name;
            }
            if (cp == 0) {
                  hp = gethostbyaddr((char *)inp, sizeof (*inp), AF_INET);
                  if (hp) {
                        cp = hp->h_name;
                        trimdomain(cp, strlen(cp));
                  }
            }
      }
      if (inp->s_addr == INADDR_ANY)
            strcpy(line, "*");
      else if (cp) {
            strncpy(line, cp, sizeof(line) - 1);
            line[sizeof(line) - 1] = '\0';
      } else {
            inp->s_addr = ntohl(inp->s_addr);
#define     C(x)  ((u_int)((x) & 0xff))
            sprintf(line, "%u.%u.%u.%u", C(inp->s_addr >> 24),
                C(inp->s_addr >> 16), C(inp->s_addr >> 8), C(inp->s_addr));
      }
      return (line);
}

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