usr.bin/netstat/inet.c

   1 /*-
   2  * Copyright (c) 1983, 1988, 1993, 1995
   3  *      The Regents of the University of California.  All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  * 3. All advertising materials mentioning features or use of this software
  14  *    must display the following acknowledgement:
  15  *      This product includes software developed by the University of
  16  *      California, Berkeley and its contributors.
  17  * 4. Neither the name of the University nor the names of its contributors
  18  *    may be used to endorse or promote products derived from this software
  19  *    without specific prior written permission.
  20  *
  21  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  22  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  25  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  31  * SUCH DAMAGE.
  32  */
  33
  34 #if 0
  35 #ifndef lint
  36 static char sccsid[] = "@(#)inet.c      8.5 (Berkeley) 5/24/95";
  37 #endif /* not lint */
  38 #endif
  39
  40 #include <sys/cdefs.h>
  41 __FBSDID("$FreeBSD$");
  42
  43 #include <sys/param.h>
  44 #include <sys/queue.h>
  45 #include <sys/domain.h>
  46 #include <sys/protosw.h>
  47 #include <sys/socket.h>
  48 #include <sys/socketvar.h>
  49 #include <sys/sysctl.h>
  50
  51 #include <net/route.h>
  52 #include <netinet/in.h>
  53 #include <netinet/in_systm.h>
  54 #include <netinet/ip.h>
  55 #include <netinet/ip_carp.h>
  56 #ifdef INET6
  57 #include <netinet/ip6.h>
  58 #endif /* INET6 */
  59 #include <netinet/in_pcb.h>
  60 #include <netinet/ip_icmp.h>
  61 #include <netinet/icmp_var.h>
  62 #include <netinet/igmp_var.h>
  63 #include <netinet/ip_var.h>
  64 #include <netinet/pim_var.h>
  65 #include <netinet/tcp.h>
  66 #include <netinet/tcpip.h>
  67 #include <netinet/tcp_seq.h>
  68 #define TCPSTATES
  69 #include <netinet/tcp_fsm.h>
  70 #include <netinet/tcp_timer.h>
  71 #include <netinet/tcp_var.h>
  72 #include <netinet/tcp_debug.h>
  73 #include <netinet/udp.h>
  74 #include <netinet/udp_var.h>
  75
  76 #include <arpa/inet.h>
  77 #include <err.h>
  78 #include <errno.h>
  79 #include <libutil.h>
  80 #include <netdb.h>
  81 #include <stdint.h>
  82 #include <stdio.h>
  83 #include <stdlib.h>
  84 #include <string.h>
  85 #include <unistd.h>
  86 #include "netstat.h"
  87
  88 char    *inetname(struct in_addr *);
  89 void    inetprint(struct in_addr *, int, const char *, int);
  90 #ifdef INET6
  91 static int udp_done, tcp_done;
  92 #endif /* INET6 */
  93
  94 static int
  95 pcblist_sysctl(int proto, char **bufp, int istcp)
  96 {
  97         const char *mibvar;
  98         char *buf;
  99         size_t len;
 100
 101         switch (proto) {
 102         case IPPROTO_TCP:
 103                 mibvar = "net.inet.tcp.pcblist";
 104                 break;
 105         case IPPROTO_UDP:
 106                 mibvar = "net.inet.udp.pcblist";
 107                 break;
 108         case IPPROTO_DIVERT:
 109                 mibvar = "net.inet.divert.pcblist";
 110                 break;
 111         default:
 112                 mibvar = "net.inet.raw.pcblist";
 113                 break;
 114         }
 115
 116         len = 0;
 117         if (sysctlbyname(mibvar, 0, &len, 0, 0) < 0) {
 118                 if (errno != ENOENT)
 119                         warn("sysctl: %s", mibvar);
 120                 return (0);
 121         }
 122         if ((buf = malloc(len)) == 0) {
 123                 warnx("malloc %lu bytes", (u_long)len);
 124                 return (0);
 125         }
 126         if (sysctlbyname(mibvar, buf, &len, 0, 0) < 0) {
 127                 warn("sysctl: %s", mibvar);
 128                 free(buf);
 129                 return (0);
 130         }
 131         *bufp = buf;
 132         return (1);
 133 }
 134
 135 /*
 136  * Copied directly from uipc_socket2.c.  We leave out some fields that are in
 137  * nested structures that aren't used to avoid extra work.
 138  */
 139 static void
 140 sbtoxsockbuf(struct sockbuf *sb, struct xsockbuf *xsb)
 141 {
 142         xsb->sb_cc = sb->sb_cc;
 143         xsb->sb_hiwat = sb->sb_hiwat;
 144         xsb->sb_mbcnt = sb->sb_mbcnt;
 145         xsb->sb_mcnt = sb->sb_mcnt;
 146         xsb->sb_ccnt = sb->sb_ccnt;
 147         xsb->sb_mbmax = sb->sb_mbmax;
 148         xsb->sb_lowat = sb->sb_lowat;
 149         xsb->sb_flags = sb->sb_flags;
 150         xsb->sb_timeo = sb->sb_timeo;
 151 }
 152
 153 int
 154 sotoxsocket(struct socket *so, struct xsocket *xso)
 155 {
 156         struct protosw proto;
 157         struct domain domain;
 158
 159         bzero(xso, sizeof *xso);
 160         xso->xso_len = sizeof *xso;
 161         xso->xso_so = so;
 162         xso->so_type = so->so_type;
 163         xso->so_options = so->so_options;
 164         xso->so_linger = so->so_linger;
 165         xso->so_state = so->so_state;
 166         xso->so_pcb = so->so_pcb;
 167         if (kread((uintptr_t)so->so_proto, &proto, sizeof(proto)) != 0)
 168                 return (-1);
 169         xso->xso_protocol = proto.pr_protocol;
 170         if (kread((uintptr_t)proto.pr_domain, &domain, sizeof(domain)) != 0)
 171                 return (-1);
 172         xso->xso_family = domain.dom_family;
 173         xso->so_qlen = so->so_qlen;
 174         xso->so_incqlen = so->so_incqlen;
 175         xso->so_qlimit = so->so_qlimit;
 176         xso->so_timeo = so->so_timeo;
 177         xso->so_error = so->so_error;
 178         xso->so_oobmark = so->so_oobmark;
 179         sbtoxsockbuf(&so->so_snd, &xso->so_snd);
 180         sbtoxsockbuf(&so->so_rcv, &xso->so_rcv);
 181         return (0);
 182 }
 183
 184 static int
 185 pcblist_kvm(u_long off, char **bufp, int istcp)
 186 {
 187         struct inpcbinfo pcbinfo;
 188         struct inpcbhead listhead;
 189         struct inpcb *inp;
 190         struct xinpcb xi;
 191         struct xinpgen xig;
 192         struct xtcpcb xt;
 193         struct socket so;
 194         struct xsocket *xso;
 195         char *buf, *p;
 196         size_t len;
 197
 198         if (off == 0)
 199                 return (0);
 200         kread(off, &pcbinfo, sizeof(pcbinfo));
 201         if (istcp)
 202                 len = 2 * sizeof(xig) +
 203                     (pcbinfo.ipi_count + pcbinfo.ipi_count / 8) *
 204                     sizeof(struct xtcpcb);
 205         else
 206                 len = 2 * sizeof(xig) +
 207                     (pcbinfo.ipi_count + pcbinfo.ipi_count / 8) *
 208                     sizeof(struct xinpcb);
 209         if ((buf = malloc(len)) == 0) {
 210                 warnx("malloc %lu bytes", (u_long)len);
 211                 return (0);
 212         }
 213         p = buf;
 214
 215 #define COPYOUT(obj, size) do {                                         \
 216         if (len < (size)) {                                             \
 217                 warnx("buffer size exceeded");                          \
 218                 goto fail;                                              \
 219         }                                                               \
 220         bcopy((obj), p, (size));                                        \
 221         len -= (size);                                                  \
 222         p += (size);                                                    \
 223 } while (0)
 224
 225 #define KREAD(off, buf, len) do {                                       \
 226         if (kread((uintptr_t)(off), (buf), (len)) != 0)                 \
 227                 goto fail;                                              \
 228 } while (0)
 229
 230         /* Write out header. */
 231         xig.xig_len = sizeof xig;
 232         xig.xig_count = pcbinfo.ipi_count;
 233         xig.xig_gen = pcbinfo.ipi_gencnt;
 234         xig.xig_sogen = 0;
 235         COPYOUT(&xig, sizeof xig);
 236
 237         /* Walk the PCB list. */
 238         xt.xt_len = sizeof xt;
 239         xi.xi_len = sizeof xi;
 240         if (istcp)
 241                 xso = &xt.xt_socket;
 242         else
 243                 xso = &xi.xi_socket;
 244         KREAD(pcbinfo.ipi_listhead, &listhead, sizeof(listhead));
 245         LIST_FOREACH(inp, &listhead, inp_list) {
 246                 if (istcp) {
 247                         KREAD(inp, &xt.xt_inp, sizeof(*inp));
 248                         inp = &xt.xt_inp;
 249                 } else {
 250                         KREAD(inp, &xi.xi_inp, sizeof(*inp));
 251                         inp = &xi.xi_inp;
 252                 }
 253
 254                 if (inp->inp_gencnt > pcbinfo.ipi_gencnt)
 255                         continue;
 256
 257                 if (istcp) {
 258                         if (inp->inp_ppcb == NULL)
 259                                 bzero(&xt.xt_tp, sizeof xt.xt_tp);
 260                         else if (inp->inp_flags & INP_TIMEWAIT) {
 261                                 bzero(&xt.xt_tp, sizeof xt.xt_tp);
 262                                 xt.xt_tp.t_state = TCPS_TIME_WAIT;
 263                         } else
 264                                 KREAD(inp->inp_ppcb, &xt.xt_tp,
 265                                     sizeof xt.xt_tp);
 266                 }
 267                 if (inp->inp_socket) {
 268                         KREAD(inp->inp_socket, &so, sizeof(so));
 269                         if (sotoxsocket(&so, xso) != 0)
 270                                 goto fail;
 271                 } else {
 272                         bzero(xso, sizeof(*xso));
 273                         if (istcp)
 274                                 xso->xso_protocol = IPPROTO_TCP;
 275                 }
 276                 if (istcp)
 277                         COPYOUT(&xt, sizeof xt);
 278                 else
 279                         COPYOUT(&xi, sizeof xi);
 280         }
 281
 282         /* Reread the pcbinfo and write out the footer. */
 283         kread(off, &pcbinfo, sizeof(pcbinfo));
 284         xig.xig_count = pcbinfo.ipi_count;
 285         xig.xig_gen = pcbinfo.ipi_gencnt;
 286         COPYOUT(&xig, sizeof xig);
 287
 288         *bufp = buf;
 289         return (1);
 290
 291 fail:
 292         free(buf);
 293         return (0);
 294 #undef COPYOUT
 295 #undef KREAD
 296 }
 297
 298 /*
 299  * Print a summary of connections related to an Internet
 300  * protocol.  For TCP, also give state of connection.
 301  * Listening processes (aflag) are suppressed unless the
 302  * -a (all) flag is specified.
 303  */
 304 void
 305 protopr(u_long off, const char *name, int af1, int proto)
 306 {
 307         int istcp;
 308         static int first = 1;
 309         char *buf;
 310         const char *vchar;
 311         struct tcpcb *tp = NULL;
 312         struct inpcb *inp;
 313         struct xinpgen *xig, *oxig;
 314         struct xsocket *so;
 315
 316         istcp = 0;
 317         switch (proto) {
 318         case IPPROTO_TCP:
 319 #ifdef INET6
 320                 if (tcp_done != 0)
 321                         return;
 322                 else
 323                         tcp_done = 1;
 324 #endif
 325                 istcp = 1;
 326                 break;
 327         case IPPROTO_UDP:
 328 #ifdef INET6
 329                 if (udp_done != 0)
 330                         return;
 331                 else
 332                         udp_done = 1;
 333 #endif
 334                 break;
 335         }
 336         if (live) {
 337                 if (!pcblist_sysctl(proto, &buf, istcp))
 338                         return;
 339         } else {
 340                 if (!pcblist_kvm(off, &buf, istcp))
 341                         return;
 342         }
 343
 344         oxig = xig = (struct xinpgen *)buf;
 345         for (xig = (struct xinpgen *)((char *)xig + xig->xig_len);
 346              xig->xig_len > sizeof(struct xinpgen);
 347              xig = (struct xinpgen *)((char *)xig + xig->xig_len)) {
 348                 if (istcp) {
 349                         tp = &((struct xtcpcb *)xig)->xt_tp;
 350                         inp = &((struct xtcpcb *)xig)->xt_inp;
 351                         so = &((struct xtcpcb *)xig)->xt_socket;
 352                 } else {
 353                         inp = &((struct xinpcb *)xig)->xi_inp;
 354                         so = &((struct xinpcb *)xig)->xi_socket;
 355                 }
 356
 357                 /* Ignore sockets for protocols other than the desired one. */
 358                 if (so->xso_protocol != proto)
 359                         continue;
 360
 361                 /* Ignore PCBs which were freed during copyout. */
 362                 if (inp->inp_gencnt > oxig->xig_gen)
 363                         continue;
 364
 365                 if ((af1 == AF_INET && (inp->inp_vflag & INP_IPV4) == 0)
 366 #ifdef INET6
 367                     || (af1 == AF_INET6 && (inp->inp_vflag & INP_IPV6) == 0)
 368 #endif /* INET6 */
 369                     || (af1 == AF_UNSPEC && ((inp->inp_vflag & INP_IPV4) == 0
 370 #ifdef INET6
 371                                           && (inp->inp_vflag & INP_IPV6) == 0
 372 #endif /* INET6 */
 373                         ))
 374                     )
 375                         continue;
 376                 if (!aflag &&
 377                     (
 378                      (istcp && tp->t_state == TCPS_LISTEN)
 379                      || (af1 == AF_INET &&
 380                       inet_lnaof(inp->inp_laddr) == INADDR_ANY)
 381 #ifdef INET6
 382                      || (af1 == AF_INET6 &&
 383                          IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr))
 384 #endif /* INET6 */
 385                      || (af1 == AF_UNSPEC &&
 386                          (((inp->inp_vflag & INP_IPV4) != 0 &&
 387                            inet_lnaof(inp->inp_laddr) == INADDR_ANY)
 388 #ifdef INET6
 389                           || ((inp->inp_vflag & INP_IPV6) != 0 &&
 390                               IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_laddr))
 391 #endif
 392                           ))
 393                      ))
 394                         continue;
 395
 396                 if (first) {
 397                         if (!Lflag) {
 398                                 printf("Active Internet connections");
 399                                 if (aflag)
 400                                         printf(" (including servers)");
 401                         } else
 402                                 printf(
 403         "Current listen queue sizes (qlen/incqlen/maxqlen)");
 404                         putchar('\n');
 405                         if (Aflag)
 406                                 printf("%-8.8s ", "Tcpcb");
 407                         if (Lflag)
 408                                 printf("%-5.5s %-14.14s %-22.22s\n",
 409                                     "Proto", "Listen", "Local Address");
 410                         else {
 411                                 printf((Aflag && !Wflag) ?
 412                                        "%-5.5s %-6.6s %-6.6s  %-18.18s %-18.18s" :
 413                                        "%-5.5s %-6.6s %-6.6s  %-22.22s %-22.22s",
 414                                        "Proto", "Recv-Q", "Send-Q",
 415                                        "Local Address", "Foreign Address");
 416                                 if (xflag)
 417                                         printf("%-6.6s %-6.6s %-6.6s %-6.6s %-6.6s %-6.6s %-6.6s %-6.6s %-6.6s %-6.6s %-6.6s %-6.6s %s\n",
 418                                                 "R-MBUF", "S-MBUF", "R-CLUS",
 419                                                 "S-CLUS", "R-HIWA", "S-HIWA",
 420                                                 "R-LOWA", "S-LOWA", "R-BCNT",
 421                                                 "S-BCNT", "R-BMAX", "S-BMAX",
 422                                                "(state)");
 423                                 else
 424                                         printf("(state)\n");
 425                         }
 426                         first = 0;
 427                 }
 428                 if (Lflag && so->so_qlimit == 0)
 429                         continue;
 430                 if (Aflag) {
 431                         if (istcp)
 432                                 printf("%8lx ", (u_long)inp->inp_ppcb);
 433                         else
 434                                 printf("%8lx ", (u_long)so->so_pcb);
 435                 }
 436 #ifdef INET6
 437                 if ((inp->inp_vflag & INP_IPV6) != 0)
 438                         vchar = ((inp->inp_vflag & INP_IPV4) != 0) ?
 439                             "46" : "6 ";
 440                 else
 441 #endif
 442                 vchar = ((inp->inp_vflag & INP_IPV4) != 0) ?
 443                     "4 " : "  ";
 444                 printf("%-3.3s%-2.2s ", name, vchar);
 445                 if (Lflag) {
 446                         char buf1[15];
 447
 448                         snprintf(buf1, 15, "%d/%d/%d", so->so_qlen,
 449                             so->so_incqlen, so->so_qlimit);
 450                         printf("%-14.14s ", buf1);
 451                 } else {
 452                         printf("%6u %6u ", so->so_rcv.sb_cc, so->so_snd.sb_cc);
 453                 }
 454                 if (numeric_port) {
 455                         if (inp->inp_vflag & INP_IPV4) {
 456                                 inetprint(&inp->inp_laddr, (int)inp->inp_lport,
 457                                     name, 1);
 458                                 if (!Lflag)
 459                                         inetprint(&inp->inp_faddr,
 460                                             (int)inp->inp_fport, name, 1);
 461                         }
 462 #ifdef INET6
 463                         else if (inp->inp_vflag & INP_IPV6) {
 464                                 inet6print(&inp->in6p_laddr,
 465                                     (int)inp->inp_lport, name, 1);
 466                                 if (!Lflag)
 467                                         inet6print(&inp->in6p_faddr,
 468                                             (int)inp->inp_fport, name, 1);
 469                         } /* else nothing printed now */
 470 #endif /* INET6 */
 471                 } else if (inp->inp_flags & INP_ANONPORT) {
 472                         if (inp->inp_vflag & INP_IPV4) {
 473                                 inetprint(&inp->inp_laddr, (int)inp->inp_lport,
 474                                     name, 1);
 475                                 if (!Lflag)
 476                                         inetprint(&inp->inp_faddr,
 477                                             (int)inp->inp_fport, name, 0);
 478                         }
 479 #ifdef INET6
 480                         else if (inp->inp_vflag & INP_IPV6) {
 481                                 inet6print(&inp->in6p_laddr,
 482                                     (int)inp->inp_lport, name, 1);
 483                                 if (!Lflag)
 484                                         inet6print(&inp->in6p_faddr,
 485                                             (int)inp->inp_fport, name, 0);
 486                         } /* else nothing printed now */
 487 #endif /* INET6 */
 488                 } else {
 489                         if (inp->inp_vflag & INP_IPV4) {
 490                                 inetprint(&inp->inp_laddr, (int)inp->inp_lport,
 491                                     name, 0);
 492                                 if (!Lflag)
 493                                         inetprint(&inp->inp_faddr,
 494                                             (int)inp->inp_fport, name,
 495                                             inp->inp_lport != inp->inp_fport);
 496                         }
 497 #ifdef INET6
 498                         else if (inp->inp_vflag & INP_IPV6) {
 499                                 inet6print(&inp->in6p_laddr,
 500                                     (int)inp->inp_lport, name, 0);
 501                                 if (!Lflag)
 502                                         inet6print(&inp->in6p_faddr,
 503                                             (int)inp->inp_fport, name,
 504                                             inp->inp_lport != inp->inp_fport);
 505                         } /* else nothing printed now */
 506 #endif /* INET6 */
 507                 }
 508                 if (xflag) {
 509                         if (Lflag)
 510                                 printf("%21s %6u %6u %6u %6u %6u %6u %6u %6u %6u %6u %6u %6u ",
 511                                        " ",
 512                                        so->so_rcv.sb_mcnt, so->so_snd.sb_mcnt,
 513                                        so->so_rcv.sb_ccnt, so->so_snd.sb_ccnt,
 514                                        so->so_rcv.sb_hiwat, so->so_snd.sb_hiwat,
 515                                        so->so_rcv.sb_lowat, so->so_snd.sb_lowat,
 516                                        so->so_rcv.sb_mbcnt, so->so_snd.sb_mbcnt,
 517                                        so->so_rcv.sb_mbmax, so->so_snd.sb_mbmax);
 518                         else
 519                                 printf("%6u %6u %6u %6u %6u %6u %6u %6u %6u %6u %6u %6u ",
 520                                        so->so_rcv.sb_mcnt, so->so_snd.sb_mcnt,
 521                                        so->so_rcv.sb_ccnt, so->so_snd.sb_ccnt,
 522                                        so->so_rcv.sb_hiwat, so->so_snd.sb_hiwat,
 523                                        so->so_rcv.sb_lowat, so->so_snd.sb_lowat,
 524                                        so->so_rcv.sb_mbcnt, so->so_snd.sb_mbcnt,
 525                                        so->so_rcv.sb_mbmax, so->so_snd.sb_mbmax);
 526                 }
 527                 if (istcp && !Lflag) {
 528                         if (tp->t_state < 0 || tp->t_state >= TCP_NSTATES)
 529                                 printf("%d", tp->t_state);
 530                         else {
 531                                 printf("%s", tcpstates[tp->t_state]);
 532 #if defined(TF_NEEDSYN) && defined(TF_NEEDFIN)
 533                                 /* Show T/TCP `hidden state' */
 534                                 if (tp->t_flags & (TF_NEEDSYN|TF_NEEDFIN))
 535                                         putchar('*');
 536 #endif /* defined(TF_NEEDSYN) && defined(TF_NEEDFIN) */
 537                         }
 538                 }
 539                 putchar('\n');
 540         }
 541         if (xig != oxig && xig->xig_gen != oxig->xig_gen) {
 542                 if (oxig->xig_count > xig->xig_count) {
 543                         printf("Some %s sockets may have been deleted.\n",
 544                             name);
 545                 } else if (oxig->xig_count < xig->xig_count) {
 546                         printf("Some %s sockets may have been created.\n",
 547                             name);
 548                 } else {
 549                         printf(
 550         "Some %s sockets may have been created or deleted.\n",
 551                             name);
 552                 }
 553         }
 554         free(buf);
 555 }
 556
 557 /*
 558  * Dump TCP statistics structure.
 559  */
 560 void
 561 tcp_stats(u_long off, const char *name, int af1 __unused, int proto __unused)
 562 {
 563         struct tcpstat tcpstat, zerostat;
 564         size_t len = sizeof tcpstat;
 565
 566 #ifdef INET6
 567         if (tcp_done != 0)
 568                 return;
 569         else
 570                 tcp_done = 1;
 571 #endif
 572
 573         if (live) {
 574                 if (zflag)
 575                         memset(&zerostat, 0, len);
 576                 if (sysctlbyname("net.inet.tcp.stats", &tcpstat, &len,
 577                     zflag ? &zerostat : NULL, zflag ? len : 0) < 0) {
 578                         warn("sysctl: net.inet.tcp.stats");
 579                         return;
 580                 }
 581         } else
 582                 kread(off, &tcpstat, len);
 583
 584         printf ("%s:\n", name);
 585
 586 #define p(f, m) if (tcpstat.f || sflag <= 1) \
 587     printf(m, tcpstat.f, plural(tcpstat.f))
 588 #define p1a(f, m) if (tcpstat.f || sflag <= 1) \
 589     printf(m, tcpstat.f)
 590 #define p2(f1, f2, m) if (tcpstat.f1 || tcpstat.f2 || sflag <= 1) \
 591     printf(m, tcpstat.f1, plural(tcpstat.f1), tcpstat.f2, plural(tcpstat.f2))
 592 #define p2a(f1, f2, m) if (tcpstat.f1 || tcpstat.f2 || sflag <= 1) \
 593     printf(m, tcpstat.f1, plural(tcpstat.f1), tcpstat.f2)
 594 #define p3(f, m) if (tcpstat.f || sflag <= 1) \
 595     printf(m, tcpstat.f, pluralies(tcpstat.f))
 596
 597         p(tcps_sndtotal, "\t%lu packet%s sent\n");
 598         p2(tcps_sndpack,tcps_sndbyte, "\t\t%lu data packet%s (%lu byte%s)\n");
 599         p2(tcps_sndrexmitpack, tcps_sndrexmitbyte,
 600             "\t\t%lu data packet%s (%lu byte%s) retransmitted\n");
 601         p(tcps_sndrexmitbad,
 602             "\t\t%lu data packet%s unnecessarily retransmitted\n");
 603         p(tcps_mturesent, "\t\t%lu resend%s initiated by MTU discovery\n");
 604         p2a(tcps_sndacks, tcps_delack,
 605             "\t\t%lu ack-only packet%s (%lu delayed)\n");
 606         p(tcps_sndurg, "\t\t%lu URG only packet%s\n");
 607         p(tcps_sndprobe, "\t\t%lu window probe packet%s\n");
 608         p(tcps_sndwinup, "\t\t%lu window update packet%s\n");
 609         p(tcps_sndctrl, "\t\t%lu control packet%s\n");
 610         p(tcps_rcvtotal, "\t%lu packet%s received\n");
 611         p2(tcps_rcvackpack, tcps_rcvackbyte,
 612             "\t\t%lu ack%s (for %lu byte%s)\n");
 613         p(tcps_rcvdupack, "\t\t%lu duplicate ack%s\n");
 614         p(tcps_rcvacktoomuch, "\t\t%lu ack%s for unsent data\n");
 615         p2(tcps_rcvpack, tcps_rcvbyte,
 616             "\t\t%lu packet%s (%lu byte%s) received in-sequence\n");
 617         p2(tcps_rcvduppack, tcps_rcvdupbyte,
 618             "\t\t%lu completely duplicate packet%s (%lu byte%s)\n");
 619         p(tcps_pawsdrop, "\t\t%lu old duplicate packet%s\n");
 620         p2(tcps_rcvpartduppack, tcps_rcvpartdupbyte,
 621             "\t\t%lu packet%s with some dup. data (%lu byte%s duped)\n");
 622         p2(tcps_rcvoopack, tcps_rcvoobyte,
 623             "\t\t%lu out-of-order packet%s (%lu byte%s)\n");
 624         p2(tcps_rcvpackafterwin, tcps_rcvbyteafterwin,
 625             "\t\t%lu packet%s (%lu byte%s) of data after window\n");
 626         p(tcps_rcvwinprobe, "\t\t%lu window probe%s\n");
 627         p(tcps_rcvwinupd, "\t\t%lu window update packet%s\n");
 628         p(tcps_rcvafterclose, "\t\t%lu packet%s received after close\n");
 629         p(tcps_rcvbadsum, "\t\t%lu discarded for bad checksum%s\n");
 630         p(tcps_rcvbadoff, "\t\t%lu discarded for bad header offset field%s\n");
 631         p1a(tcps_rcvshort, "\t\t%lu discarded because packet too short\n");
 632         p1a(tcps_rcvmemdrop, "\t\t%lu discarded due to memory problems\n");
 633         p(tcps_connattempt, "\t%lu connection request%s\n");
 634         p(tcps_accepts, "\t%lu connection accept%s\n");
 635         p(tcps_badsyn, "\t%lu bad connection attempt%s\n");
 636         p(tcps_listendrop, "\t%lu listen queue overflow%s\n");
 637         p(tcps_badrst, "\t%lu ignored RSTs in the window%s\n");
 638         p(tcps_connects, "\t%lu connection%s established (including accepts)\n");
 639         p2(tcps_closed, tcps_drops,
 640             "\t%lu connection%s closed (including %lu drop%s)\n");
 641         p(tcps_cachedrtt, "\t\t%lu connection%s updated cached RTT on close\n");
 642         p(tcps_cachedrttvar,
 643             "\t\t%lu connection%s updated cached RTT variance on close\n");
 644         p(tcps_cachedssthresh,
 645             "\t\t%lu connection%s updated cached ssthresh on close\n");
 646         p(tcps_conndrops, "\t%lu embryonic connection%s dropped\n");
 647         p2(tcps_rttupdated, tcps_segstimed,
 648             "\t%lu segment%s updated rtt (of %lu attempt%s)\n");
 649         p(tcps_rexmttimeo, "\t%lu retransmit timeout%s\n");
 650         p(tcps_timeoutdrop, "\t\t%lu connection%s dropped by rexmit timeout\n");
 651         p(tcps_persisttimeo, "\t%lu persist timeout%s\n");
 652         p(tcps_persistdrop, "\t\t%lu connection%s dropped by persist timeout\n");
 653         p(tcps_finwait2_drops,
 654             "\t%lu Connection%s (fin_wait_2) dropped because of timeout\n");
 655         p(tcps_keeptimeo, "\t%lu keepalive timeout%s\n");
 656         p(tcps_keepprobe, "\t\t%lu keepalive probe%s sent\n");
 657         p(tcps_keepdrops, "\t\t%lu connection%s dropped by keepalive\n");
 658         p(tcps_predack, "\t%lu correct ACK header prediction%s\n");
 659         p(tcps_preddat, "\t%lu correct data packet header prediction%s\n");
 660
 661         p3(tcps_sc_added, "\t%lu syncache entr%s added\n");
 662         p1a(tcps_sc_retransmitted, "\t\t%lu retransmitted\n");
 663         p1a(tcps_sc_dupsyn, "\t\t%lu dupsyn\n");
 664         p1a(tcps_sc_dropped, "\t\t%lu dropped\n");
 665         p1a(tcps_sc_completed, "\t\t%lu completed\n");
 666         p1a(tcps_sc_bucketoverflow, "\t\t%lu bucket overflow\n");
 667         p1a(tcps_sc_cacheoverflow, "\t\t%lu cache overflow\n");
 668         p1a(tcps_sc_reset, "\t\t%lu reset\n");
 669         p1a(tcps_sc_stale, "\t\t%lu stale\n");
 670         p1a(tcps_sc_aborted, "\t\t%lu aborted\n");
 671         p1a(tcps_sc_badack, "\t\t%lu badack\n");
 672         p1a(tcps_sc_unreach, "\t\t%lu unreach\n");
 673         p(tcps_sc_zonefail, "\t\t%lu zone failure%s\n");
 674         p(tcps_sc_sendcookie, "\t%lu cookie%s sent\n");
 675         p(tcps_sc_recvcookie, "\t%lu cookie%s received\n");
 676
 677         p(tcps_sack_recovery_episode, "\t%lu SACK recovery episode%s\n");
 678         p(tcps_sack_rexmits,
 679             "\t%lu segment rexmit%s in SACK recovery episodes\n");
 680         p(tcps_sack_rexmit_bytes,
 681             "\t%lu byte rexmit%s in SACK recovery episodes\n");
 682         p(tcps_sack_rcv_blocks,
 683             "\t%lu SACK option%s (SACK blocks) received\n");
 684         p(tcps_sack_send_blocks, "\t%lu SACK option%s (SACK blocks) sent\n");
 685         p1a(tcps_sack_sboverflow, "\t%lu SACK scoreboard overflow\n");
 686
 687         p(tcps_ecn_ce, "\t%lu packet%s with ECN CE bit set\n");
 688         p(tcps_ecn_ect0, "\t%lu packet%s with ECN ECT(0) bit set\n");
 689         p(tcps_ecn_ect1, "\t%lu packet%s with ECN ECT(1) bit set\n");
 690         p(tcps_ecn_shs, "\t%lu successful ECN handshake%s\n");
 691         p(tcps_ecn_rcwnd, "\t%lu time%s ECN reduced the congestion window\n");
 692 #undef p
 693 #undef p1a
 694 #undef p2
 695 #undef p2a
 696 #undef p3
 697 }
 698
 699 /*
 700  * Dump UDP statistics structure.
 701  */
 702 void
 703 udp_stats(u_long off, const char *name, int af1 __unused, int proto __unused)
 704 {
 705         struct udpstat udpstat, zerostat;
 706         size_t len = sizeof udpstat;
 707         u_long delivered;
 708
 709 #ifdef INET6
 710         if (udp_done != 0)
 711                 return;
 712         else
 713                 udp_done = 1;
 714 #endif
 715
 716         if (live) {
 717                 if (zflag)
 718                         memset(&zerostat, 0, len);
 719                 if (sysctlbyname("net.inet.udp.stats", &udpstat, &len,
 720                     zflag ? &zerostat : NULL, zflag ? len : 0) < 0) {
 721                         warn("sysctl: net.inet.udp.stats");
 722                         return;
 723                 }
 724         } else
 725                 kread(off, &udpstat, len);
 726
 727         printf("%s:\n", name);
 728 #define p(f, m) if (udpstat.f || sflag <= 1) \
 729     printf(m, udpstat.f, plural(udpstat.f))
 730 #define p1a(f, m) if (udpstat.f || sflag <= 1) \
 731     printf(m, udpstat.f)
 732         p(udps_ipackets, "\t%lu datagram%s received\n");
 733         p1a(udps_hdrops, "\t%lu with incomplete header\n");
 734         p1a(udps_badlen, "\t%lu with bad data length field\n");
 735         p1a(udps_badsum, "\t%lu with bad checksum\n");
 736         p1a(udps_nosum, "\t%lu with no checksum\n");
 737         p1a(udps_noport, "\t%lu dropped due to no socket\n");
 738         p(udps_noportbcast,
 739             "\t%lu broadcast/multicast datagram%s undelivered\n");
 740         p1a(udps_fullsock, "\t%lu dropped due to full socket buffers\n");
 741         p1a(udpps_pcbhashmiss, "\t%lu not for hashed pcb\n");
 742         delivered = udpstat.udps_ipackets -
 743                     udpstat.udps_hdrops -
 744                     udpstat.udps_badlen -
 745                     udpstat.udps_badsum -
 746                     udpstat.udps_noport -
 747                     udpstat.udps_noportbcast -
 748                     udpstat.udps_fullsock;
 749         if (delivered || sflag <= 1)
 750                 printf("\t%lu delivered\n", delivered);
 751         p(udps_opackets, "\t%lu datagram%s output\n");
 752         /* the next statistic is cumulative in udps_noportbcast */
 753         p(udps_filtermcast,
 754             "\t%lu time%s multicast source filter matched\n");
 755 #undef p
 756 #undef p1a
 757 }
 758
 759 /*
 760  * Dump CARP statistics structure.
 761  */
 762 void
 763 carp_stats(u_long off, const char *name, int af1 __unused, int proto __unused)
 764 {
 765         struct carpstats carpstat, zerostat;
 766         size_t len = sizeof(struct carpstats);
 767
 768         if (live) {
 769                 if (zflag)
 770                         memset(&zerostat, 0, len);
 771                 if (sysctlbyname("net.inet.carp.stats", &carpstat, &len,
 772                     zflag ? &zerostat : NULL, zflag ? len : 0) < 0) {
 773                         if (errno != ENOENT)
 774                                 warn("sysctl: net.inet.carp.stats");
 775                         return;
 776                 }
 777         } else {
 778                 if (off == 0)
 779                         return;
 780                 kread(off, &carpstat, len);
 781         }
 782
 783         printf("%s:\n", name);
 784
 785 #define p(f, m) if (carpstat.f || sflag <= 1) \
 786         printf(m, (uintmax_t)carpstat.f, plural(carpstat.f))
 787 #define p2(f, m) if (carpstat.f || sflag <= 1) \
 788         printf(m, (uintmax_t)carpstat.f)
 789
 790         p(carps_ipackets, "\t%ju packet%s received (IPv4)\n");
 791         p(carps_ipackets6, "\t%ju packet%s received (IPv6)\n");
 792         p(carps_badttl, "\t\t%ju packet%s discarded for wrong TTL\n");
 793         p(carps_hdrops, "\t\t%ju packet%s shorter than header\n");
 794         p(carps_badsum, "\t\t%ju discarded for bad checksum%s\n");
 795         p(carps_badver, "\t\t%ju discarded packet%s with a bad version\n");
 796         p2(carps_badlen, "\t\t%ju discarded because packet too short\n");
 797         p2(carps_badauth, "\t\t%ju discarded for bad authentication\n");
 798         p2(carps_badvhid, "\t\t%ju discarded for bad vhid\n");
 799         p2(carps_badaddrs, "\t\t%ju discarded because of a bad address list\n");
 800         p(carps_opackets, "\t%ju packet%s sent (IPv4)\n");
 801         p(carps_opackets6, "\t%ju packet%s sent (IPv6)\n");
 802         p2(carps_onomem, "\t\t%ju send failed due to mbuf memory error\n");
 803 #if notyet
 804         p(carps_ostates, "\t\t%s state update%s sent\n");
 805 #endif
 806 #undef p
 807 #undef p2
 808 }
 809
 810 /*
 811  * Dump IP statistics structure.
 812  */
 813 void
 814 ip_stats(u_long off, const char *name, int af1 __unused, int proto __unused)
 815 {
 816         struct ipstat ipstat, zerostat;
 817         size_t len = sizeof ipstat;
 818
 819         if (live) {
 820                 if (zflag)
 821                         memset(&zerostat, 0, len);
 822                 if (sysctlbyname("net.inet.ip.stats", &ipstat, &len,
 823                     zflag ? &zerostat : NULL, zflag ? len : 0) < 0) {
 824                         warn("sysctl: net.inet.ip.stats");
 825                         return;
 826                 }
 827         } else
 828                 kread(off, &ipstat, len);
 829
 830         printf("%s:\n", name);
 831
 832 #define p(f, m) if (ipstat.f || sflag <= 1) \
 833     printf(m, ipstat.f, plural(ipstat.f))
 834 #define p1a(f, m) if (ipstat.f || sflag <= 1) \
 835     printf(m, ipstat.f)
 836
 837         p(ips_total, "\t%lu total packet%s received\n");
 838         p(ips_badsum, "\t%lu bad header checksum%s\n");
 839         p1a(ips_toosmall, "\t%lu with size smaller than minimum\n");
 840         p1a(ips_tooshort, "\t%lu with data size < data length\n");
 841         p1a(ips_toolong, "\t%lu with ip length > max ip packet size\n");
 842         p1a(ips_badhlen, "\t%lu with header length < data size\n");
 843         p1a(ips_badlen, "\t%lu with data length < header length\n");
 844         p1a(ips_badoptions, "\t%lu with bad options\n");
 845         p1a(ips_badvers, "\t%lu with incorrect version number\n");
 846         p(ips_fragments, "\t%lu fragment%s received\n");
 847         p(ips_fragdropped, "\t%lu fragment%s dropped (dup or out of space)\n");
 848         p(ips_fragtimeout, "\t%lu fragment%s dropped after timeout\n");
 849         p(ips_reassembled, "\t%lu packet%s reassembled ok\n");
 850         p(ips_delivered, "\t%lu packet%s for this host\n");
 851         p(ips_noproto, "\t%lu packet%s for unknown/unsupported protocol\n");
 852         p(ips_forward, "\t%lu packet%s forwarded");
 853         p(ips_fastforward, " (%lu packet%s fast forwarded)");
 854         if (ipstat.ips_forward || sflag <= 1)
 855                 putchar('\n');
 856         p(ips_cantforward, "\t%lu packet%s not forwardable\n");
 857         p(ips_notmember,
 858             "\t%lu packet%s received for unknown multicast group\n");
 859         p(ips_redirectsent, "\t%lu redirect%s sent\n");
 860         p(ips_localout, "\t%lu packet%s sent from this host\n");
 861         p(ips_rawout, "\t%lu packet%s sent with fabricated ip header\n");
 862         p(ips_odropped,
 863             "\t%lu output packet%s dropped due to no bufs, etc.\n");
 864         p(ips_noroute, "\t%lu output packet%s discarded due to no route\n");
 865         p(ips_fragmented, "\t%lu output datagram%s fragmented\n");
 866         p(ips_ofragments, "\t%lu fragment%s created\n");
 867         p(ips_cantfrag, "\t%lu datagram%s that can't be fragmented\n");
 868         p(ips_nogif, "\t%lu tunneling packet%s that can't find gif\n");
 869         p(ips_badaddr, "\t%lu datagram%s with bad address in header\n");
 870 #undef p
 871 #undef p1a
 872 }
 873
 874 static  const char *icmpnames[ICMP_MAXTYPE + 1] = {
 875         "echo reply",                   /* RFC 792 */
 876         "#1",
 877         "#2",
 878         "destination unreachable",      /* RFC 792 */
 879         "source quench",                /* RFC 792 */
 880         "routing redirect",             /* RFC 792 */
 881         "#6",
 882         "#7",
 883         "echo",                         /* RFC 792 */
 884         "router advertisement",         /* RFC 1256 */
 885         "router solicitation",          /* RFC 1256 */
 886         "time exceeded",                /* RFC 792 */
 887         "parameter problem",            /* RFC 792 */
 888         "time stamp",                   /* RFC 792 */
 889         "time stamp reply",             /* RFC 792 */
 890         "information request",          /* RFC 792 */
 891         "information request reply",    /* RFC 792 */
 892         "address mask request",         /* RFC 950 */
 893         "address mask reply",           /* RFC 950 */
 894         "#19",
 895         "#20",
 896         "#21",
 897         "#22",
 898         "#23",
 899         "#24",
 900         "#25",
 901         "#26",
 902         "#27",
 903         "#28",
 904         "#29",
 905         "icmp traceroute",              /* RFC 1393 */
 906         "datagram conversion error",    /* RFC 1475 */
 907         "mobile host redirect",
 908         "IPv6 where-are-you",
 909         "IPv6 i-am-here",
 910         "mobile registration req",
 911         "mobile registration reply",
 912         "domain name request",          /* RFC 1788 */
 913         "domain name reply",            /* RFC 1788 */
 914         "icmp SKIP",
 915         "icmp photuris",                /* RFC 2521 */
 916 };
 917
 918 /*
 919  * Dump ICMP statistics.
 920  */
 921 void
 922 icmp_stats(u_long off, const char *name, int af1 __unused, int proto __unused)
 923 {
 924         struct icmpstat icmpstat, zerostat;
 925         int i, first;
 926         size_t len;
 927
 928         len = sizeof icmpstat;
 929         if (live) {
 930                 if (zflag)
 931                         memset(&zerostat, 0, len);
 932                 if (sysctlbyname("net.inet.icmp.stats", &icmpstat, &len,
 933                     zflag ? &zerostat : NULL, zflag ? len : 0) < 0) {
 934                         warn("sysctl: net.inet.icmp.stats");
 935                         return;
 936                 }
 937         } else
 938                 kread(off, &icmpstat, len);
 939
 940         printf("%s:\n", name);
 941
 942 #define p(f, m) if (icmpstat.f || sflag <= 1) \
 943     printf(m, icmpstat.f, plural(icmpstat.f))
 944 #define p1a(f, m) if (icmpstat.f || sflag <= 1) \
 945     printf(m, icmpstat.f)
 946 #define p2(f, m) if (icmpstat.f || sflag <= 1) \
 947     printf(m, icmpstat.f, plurales(icmpstat.f))
 948
 949         p(icps_error, "\t%lu call%s to icmp_error\n");
 950         p(icps_oldicmp,
 951             "\t%lu error%s not generated in response to an icmp message\n");
 952         for (first = 1, i = 0; i < ICMP_MAXTYPE + 1; i++)
 953                 if (icmpstat.icps_outhist[i] != 0) {
 954                         if (first) {
 955                                 printf("\tOutput histogram:\n");
 956                                 first = 0;
 957                         }
 958                         if (icmpnames[i] != NULL)
 959                                 printf("\t\t%s: %lu\n", icmpnames[i],
 960                                         icmpstat.icps_outhist[i]);
 961                         else
 962                                 printf("\t\tunknown ICMP #%d: %lu\n", i,
 963                                         icmpstat.icps_outhist[i]);
 964                 }
 965         p(icps_badcode, "\t%lu message%s with bad code fields\n");
 966         p(icps_tooshort, "\t%lu message%s less than the minimum length\n");
 967         p(icps_checksum, "\t%lu message%s with bad checksum\n");
 968         p(icps_badlen, "\t%lu message%s with bad length\n");
 969         p1a(icps_bmcastecho, "\t%lu multicast echo requests ignored\n");
 970         p1a(icps_bmcasttstamp, "\t%lu multicast timestamp requests ignored\n");
 971         for (first = 1, i = 0; i < ICMP_MAXTYPE + 1; i++)
 972                 if (icmpstat.icps_inhist[i] != 0) {
 973                         if (first) {
 974                                 printf("\tInput histogram:\n");
 975                                 first = 0;
 976                         }
 977                         if (icmpnames[i] != NULL)
 978                                 printf("\t\t%s: %lu\n", icmpnames[i],
 979                                     icmpstat.icps_inhist[i]);
 980                         else
 981                                 printf("\t\tunknown ICMP #%d: %lu\n", i,
 982                                     icmpstat.icps_inhist[i]);
 983                 }
 984         p(icps_reflect, "\t%lu message response%s generated\n");
 985         p2(icps_badaddr, "\t%lu invalid return address%s\n");
 986         p(icps_noroute, "\t%lu no return route%s\n");
 987 #undef p
 988 #undef p1a
 989 #undef p2
 990         if (live) {
 991                 len = sizeof i;
 992                 if (sysctlbyname("net.inet.icmp.maskrepl", &i, &len, NULL, 0) <
 993                     0)
 994                         return;
 995                 printf("\tICMP address mask responses are %sabled\n",
 996                     i ? "en" : "dis");
 997         }
 998 }
 999
1000 #ifndef BURN_BRIDGES
1001 /*
1002  * Dump IGMP statistics structure (pre 8.x kernel).
1003  */
1004 static void
1005 igmp_stats_live_old(u_long off, const char *name)
1006 {
1007         struct oigmpstat oigmpstat, zerostat;
1008         size_t len = sizeof(oigmpstat);
1009
1010         if (zflag)
1011                 memset(&zerostat, 0, len);
1012         if (sysctlbyname("net.inet.igmp.stats", &oigmpstat, &len,
1013             zflag ? &zerostat : NULL, zflag ? len : 0) < 0) {
1014                 warn("sysctl: net.inet.igmp.stats");
1015                 return;
1016         }
1017
1018         printf("%s:\n", name);
1019
1020 #define p(f, m) if (oigmpstat.f || sflag <= 1) \
1021     printf(m, oigmpstat.f, plural(oigmpstat.f))
1022 #define py(f, m) if (oigmpstat.f || sflag <= 1) \
1023     printf(m, oigmpstat.f, oigmpstat.f != 1 ? "ies" : "y")
1024         p(igps_rcv_total, "\t%u message%s received\n");
1025         p(igps_rcv_tooshort, "\t%u message%s received with too few bytes\n");
1026         p(igps_rcv_badsum, "\t%u message%s received with bad checksum\n");
1027         py(igps_rcv_queries, "\t%u membership quer%s received\n");
1028         py(igps_rcv_badqueries,
1029             "\t%u membership quer%s received with invalid field(s)\n");
1030         p(igps_rcv_reports, "\t%u membership report%s received\n");
1031         p(igps_rcv_badreports,
1032             "\t%u membership report%s received with invalid field(s)\n");
1033         p(igps_rcv_ourreports,
1034 "\t%u membership report%s received for groups to which we belong\n");
1035         p(igps_snd_reports, "\t%u membership report%s sent\n");
1036 #undef p
1037 #undef py
1038 }
1039 #endif /* !BURN_BRIDGES */
1040
1041 /*
1042  * Dump IGMP statistics structure.
1043  */
1044 void
1045 igmp_stats(u_long off, const char *name, int af1 __unused, int proto __unused)
1046 {
1047         struct igmpstat igmpstat, zerostat;
1048         size_t len;
1049
1050 #ifndef BURN_BRIDGES
1051         if (live) {
1052                 /*
1053                  * Detect if we are being run against a pre-IGMPv3 kernel.
1054                  * We cannot do this for a core file as the legacy
1055                  * struct igmpstat has no size field, nor does it
1056                  * export it in any readily-available symbols.
1057                  */
1058                 len = 0;
1059                 if (sysctlbyname("net.inet.igmp.stats", NULL, &len, NULL,
1060                     0) < 0) {
1061                         warn("sysctl: net.inet.igmp.stats");
1062                         return;
1063                 }
1064                 if (len < sizeof(igmpstat)) {
1065                         igmp_stats_live_old(off, name);
1066                         return;
1067                 }
1068         }
1069 #endif /* !BURN_BRIDGES */
1070
1071         len = sizeof(igmpstat);
1072         if (live) {
1073                 if (zflag)
1074                         memset(&zerostat, 0, len);
1075                 if (sysctlbyname("net.inet.igmp.stats", &igmpstat, &len,
1076                     zflag ? &zerostat : NULL, zflag ? len : 0) < 0) {
1077                         warn("sysctl: net.inet.igmp.stats");
1078                         return;
1079                 }
1080         } else {
1081                 len = sizeof(igmpstat);
1082                 kread(off, &igmpstat, len);
1083         }
1084
1085         if (igmpstat.igps_version != IGPS_VERSION_3) {
1086                 warnx("%s: version mismatch (%d != %d)", __func__,
1087                     igmpstat.igps_version, IGPS_VERSION_3);
1088         }
1089         if (igmpstat.igps_len != IGPS_VERSION3_LEN) {
1090                 warnx("%s: size mismatch (%d != %d)", __func__,
1091                     igmpstat.igps_len, IGPS_VERSION3_LEN);
1092         }
1093
1094         printf("%s:\n", name);
1095
1096 #define p64(f, m) if (igmpstat.f || sflag <= 1) \
1097     printf(m, (uintmax_t) igmpstat.f, plural(igmpstat.f))
1098 #define py64(f, m) if (igmpstat.f || sflag <= 1) \
1099     printf(m, (uintmax_t) igmpstat.f, pluralies(igmpstat.f))
1100         p64(igps_rcv_total, "\t%ju message%s received\n");
1101         p64(igps_rcv_tooshort, "\t%ju message%s received with too few bytes\n");
1102         p64(igps_rcv_badttl, "\t%ju message%s received with wrong TTL\n");
1103         p64(igps_rcv_badsum, "\t%ju message%s received with bad checksum\n");
1104         py64(igps_rcv_v1v2_queries, "\t%ju V1/V2 membership quer%s received\n");
1105         py64(igps_rcv_v3_queries, "\t%ju V3 membership quer%s received\n");
1106         py64(igps_rcv_badqueries,
1107             "\t%ju membership quer%s received with invalid field(s)\n");
1108         py64(igps_rcv_gen_queries, "\t%ju general quer%s received\n");
1109         py64(igps_rcv_group_queries, "\t%ju group quer%s received\n");
1110         py64(igps_rcv_gsr_queries, "\t%ju group-source quer%s received\n");
1111         py64(igps_drop_gsr_queries, "\t%ju group-source quer%s dropped\n");
1112         p64(igps_rcv_reports, "\t%ju membership report%s received\n");
1113         p64(igps_rcv_badreports,
1114             "\t%ju membership report%s received with invalid field(s)\n");
1115         p64(igps_rcv_ourreports,
1116 "\t%ju membership report%s received for groups to which we belong\n");
1117         p64(igps_rcv_nora, "\t%ju V3 report%s received without Router Alert\n");
1118         p64(igps_snd_reports, "\t%ju membership report%s sent\n");
1119 #undef p64
1120 #undef py64
1121 }
1122
1123 /*
1124  * Dump PIM statistics structure.
1125  */
1126 void
1127 pim_stats(u_long off __unused, const char *name, int af1 __unused,
1128     int proto __unused)
1129 {
1130         struct pimstat pimstat, zerostat;
1131         size_t len = sizeof pimstat;
1132
1133         if (live) {
1134                 if (zflag)
1135                         memset(&zerostat, 0, len);
1136                 if (sysctlbyname("net.inet.pim.stats", &pimstat, &len,
1137                     zflag ? &zerostat : NULL, zflag ? len : 0) < 0) {
1138                         if (errno != ENOENT)
1139                                 warn("sysctl: net.inet.pim.stats");
1140                         return;
1141                 }
1142         } else {
1143                 if (off == 0)
1144                         return;
1145                 kread(off, &pimstat, len);
1146         }
1147
1148         printf("%s:\n", name);
1149
1150 #define p(f, m) if (pimstat.f || sflag <= 1) \
1151     printf(m, (uintmax_t)pimstat.f, plural(pimstat.f))
1152 #define py(f, m) if (pimstat.f || sflag <= 1) \
1153     printf(m, (uintmax_t)pimstat.f, pimstat.f != 1 ? "ies" : "y")
1154         p(pims_rcv_total_msgs, "\t%ju message%s received\n");
1155         p(pims_rcv_total_bytes, "\t%ju byte%s received\n");
1156         p(pims_rcv_tooshort, "\t%ju message%s received with too few bytes\n");
1157         p(pims_rcv_badsum, "\t%ju message%s received with bad checksum\n");
1158         p(pims_rcv_badversion, "\t%ju message%s received with bad version\n");
1159         p(pims_rcv_registers_msgs, "\t%ju data register message%s received\n");
1160         p(pims_rcv_registers_bytes, "\t%ju data register byte%s received\n");
1161         p(pims_rcv_registers_wrongiif,
1162             "\t%ju data register message%s received on wrong iif\n");
1163         p(pims_rcv_badregisters, "\t%ju bad register%s received\n");
1164         p(pims_snd_registers_msgs, "\t%ju data register message%s sent\n");
1165         p(pims_snd_registers_bytes, "\t%ju data register byte%s sent\n");
1166 #undef p
1167 #undef py
1168 }
1169
1170 /*
1171  * Pretty print an Internet address (net address + port).
1172  */
1173 void
1174 inetprint(struct in_addr *in, int port, const char *proto, int num_port)
1175 {
1176         struct servent *sp = 0;
1177         char line[80], *cp;
1178         int width;
1179
1180         if (Wflag)
1181             sprintf(line, "%s.", inetname(in));
1182         else
1183             sprintf(line, "%.*s.", (Aflag && !num_port) ? 12 : 16, inetname(in));
1184         cp = index(line, '\0');
1185         if (!num_port && port)
1186                 sp = getservbyport((int)port, proto);
1187         if (sp || port == 0)
1188                 sprintf(cp, "%.15s ", sp ? sp->s_name : "*");
1189         else
1190                 sprintf(cp, "%d ", ntohs((u_short)port));
1191         width = (Aflag && !Wflag) ? 18 : 22;
1192         if (Wflag)
1193             printf("%-*s ", width, line);
1194         else
1195             printf("%-*.*s ", width, width, line);
1196 }
1197
1198 /*
1199  * Construct an Internet address representation.
1200  * If numeric_addr has been supplied, give
1201  * numeric value, otherwise try for symbolic name.
1202  */
1203 char *
1204 inetname(struct in_addr *inp)
1205 {
1206         char *cp;
1207         static char line[MAXHOSTNAMELEN];
1208         struct hostent *hp;
1209         struct netent *np;
1210
1211         cp = 0;
1212         if (!numeric_addr && inp->s_addr != INADDR_ANY) {
1213                 int net = inet_netof(*inp);
1214                 int lna = inet_lnaof(*inp);
1215
1216                 if (lna == INADDR_ANY) {
1217                         np = getnetbyaddr(net, AF_INET);
1218                         if (np)
1219                                 cp = np->n_name;
1220                 }
1221                 if (cp == 0) {
1222                         hp = gethostbyaddr((char *)inp, sizeof (*inp), AF_INET);
1223                         if (hp) {
1224                                 cp = hp->h_name;
1225                                 trimdomain(cp, strlen(cp));
1226                         }
1227                 }
1228         }
1229         if (inp->s_addr == INADDR_ANY)
1230                 strcpy(line, "*");
1231         else if (cp) {
1232                 strlcpy(line, cp, sizeof(line));
1233         } else {
1234                 inp->s_addr = ntohl(inp->s_addr);
1235 #define C(x)    ((u_int)((x) & 0xff))
1236                 sprintf(line, "%u.%u.%u.%u", C(inp->s_addr >> 24),
1237                     C(inp->s_addr >> 16), C(inp->s_addr >> 8), C(inp->s_addr));
1238         }
1239         return (line);
1240 }