usr.bin/netstat/if.c

   1 /*-
   2  * Copyright (c) 2013 Gleb Smirnoff <glebius@FreeBSD.org>
   3  * Copyright (c) 1983, 1988, 1993
   4  *      The Regents of the University of California.  All rights reserved.
   5  *
   6  * Redistribution and use in source and binary forms, with or without
   7  * modification, are permitted provided that the following conditions
   8  * are met:
   9  * 1. Redistributions of source code must retain the above copyright
  10  *    notice, this list of conditions and the following disclaimer.
  11  * 2. Redistributions in binary form must reproduce the above copyright
  12  *    notice, this list of conditions and the following disclaimer in the
  13  *    documentation and/or other materials provided with the distribution.
  14  * 4. Neither the name of the University nor the names of its contributors
  15  *    may be used to endorse or promote products derived from this software
  16  *    without specific prior written permission.
  17  *
  18  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  19  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  20  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  21  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  22  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  23  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  24  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  25  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  26  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  27  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  28  * SUCH DAMAGE.
  29  */
  30
  31 #if 0
  32 #ifndef lint
  33 static char sccsid[] = "@(#)if.c        8.3 (Berkeley) 4/28/95";
  34 #endif /* not lint */
  35 #endif
  36
  37 #include <sys/cdefs.h>
  38 __FBSDID("$FreeBSD$");
  39
  40 #include <sys/param.h>
  41 #include <sys/protosw.h>
  42 #include <sys/socket.h>
  43 #include <sys/socketvar.h>
  44 #include <sys/time.h>
  45
  46 #define _IFI_OQDROPS
  47 #include <net/if.h>
  48 #include <net/if_var.h>
  49 #include <net/if_dl.h>
  50 #include <net/if_types.h>
  51 #include <net/ethernet.h>
  52 #include <netinet/in.h>
  53 #include <netinet/in_var.h>
  54 #include <netipx/ipx.h>
  55 #include <netipx/ipx_if.h>
  56 #include <arpa/inet.h>
  57 #ifdef PF
  58 #include <net/pfvar.h>
  59 #include <net/if_pfsync.h>
  60 #endif
  61
  62 #include <err.h>
  63 #include <errno.h>
  64 #include <ifaddrs.h>
  65 #include <libutil.h>
  66 #ifdef INET6
  67 #include <netdb.h>
  68 #endif
  69 #include <signal.h>
  70 #include <stdbool.h>
  71 #include <stdint.h>
  72 #include <stdio.h>
  73 #include <stdlib.h>
  74 #include <string.h>
  75 #include <sysexits.h>
  76 #include <unistd.h>
  77
  78 #include "netstat.h"
  79
  80 static void sidewaysintpr(int);
  81
  82 #ifdef INET6
  83 static char addr_buf[NI_MAXHOST];               /* for getnameinfo() */
  84 #endif
  85
  86 #ifdef PF
  87 static const char* pfsyncacts[] = {
  88         /* PFSYNC_ACT_CLR */            "clear all request",
  89         /* PFSYNC_ACT_INS */            "state insert",
  90         /* PFSYNC_ACT_INS_ACK */        "state inserted ack",
  91         /* PFSYNC_ACT_UPD */            "state update",
  92         /* PFSYNC_ACT_UPD_C */          "compressed state update",
  93         /* PFSYNC_ACT_UPD_REQ */        "uncompressed state request",
  94         /* PFSYNC_ACT_DEL */            "state delete",
  95         /* PFSYNC_ACT_DEL_C */          "compressed state delete",
  96         /* PFSYNC_ACT_INS_F */          "fragment insert",
  97         /* PFSYNC_ACT_DEL_F */          "fragment delete",
  98         /* PFSYNC_ACT_BUS */            "bulk update mark",
  99         /* PFSYNC_ACT_TDB */            "TDB replay counter update",
 100         /* PFSYNC_ACT_EOF */            "end of frame mark",
 101 };
 102
 103 static void
 104 pfsync_acts_stats(const char *fmt, uint64_t *a)
 105 {
 106         int i;
 107
 108         for (i = 0; i < PFSYNC_ACT_MAX; i++, a++)
 109                 if (*a || sflag <= 1)
 110                         printf(fmt, *a, pfsyncacts[i], plural(*a));
 111 }
 112
 113 /*
 114  * Dump pfsync statistics structure.
 115  */
 116 void
 117 pfsync_stats(u_long off, const char *name, int af1 __unused, int proto __unused)
 118 {
 119         struct pfsyncstats pfsyncstat;
 120
 121         if (fetch_stats("net.pfsync.stats", off, &pfsyncstat,
 122             sizeof(pfsyncstat), kread) != 0)
 123                 return;
 124
 125         printf("%s:\n", name);
 126
 127 #define p(f, m) if (pfsyncstat.f || sflag <= 1) \
 128         printf(m, (uintmax_t)pfsyncstat.f, plural(pfsyncstat.f))
 129
 130         p(pfsyncs_ipackets, "\t%ju packet%s received (IPv4)\n");
 131         p(pfsyncs_ipackets6, "\t%ju packet%s received (IPv6)\n");
 132         pfsync_acts_stats("\t    %ju %s%s received\n",
 133             &pfsyncstat.pfsyncs_iacts[0]);
 134         p(pfsyncs_badif, "\t\t%ju packet%s discarded for bad interface\n");
 135         p(pfsyncs_badttl, "\t\t%ju packet%s discarded for bad ttl\n");
 136         p(pfsyncs_hdrops, "\t\t%ju packet%s shorter than header\n");
 137         p(pfsyncs_badver, "\t\t%ju packet%s discarded for bad version\n");
 138         p(pfsyncs_badauth, "\t\t%ju packet%s discarded for bad HMAC\n");
 139         p(pfsyncs_badact,"\t\t%ju packet%s discarded for bad action\n");
 140         p(pfsyncs_badlen, "\t\t%ju packet%s discarded for short packet\n");
 141         p(pfsyncs_badval, "\t\t%ju state%s discarded for bad values\n");
 142         p(pfsyncs_stale, "\t\t%ju stale state%s\n");
 143         p(pfsyncs_badstate, "\t\t%ju failed state lookup/insert%s\n");
 144         p(pfsyncs_opackets, "\t%ju packet%s sent (IPv4)\n");
 145         p(pfsyncs_opackets6, "\t%ju packet%s sent (IPv6)\n");
 146         pfsync_acts_stats("\t    %ju %s%s sent\n",
 147             &pfsyncstat.pfsyncs_oacts[0]);
 148         p(pfsyncs_onomem, "\t\t%ju failure%s due to mbuf memory error\n");
 149         p(pfsyncs_oerrors, "\t\t%ju send error%s\n");
 150 #undef p
 151 }
 152 #endif /* PF */
 153
 154 /*
 155  * Display a formatted value, or a '-' in the same space.
 156  */
 157 static void
 158 show_stat(const char *fmt, int width, u_long value, short showvalue,
 159     int div1000)
 160 {
 161         const char *lsep, *rsep;
 162         char newfmt[32];
 163
 164         lsep = "";
 165         if (strncmp(fmt, "LS", 2) == 0) {
 166                 lsep = " ";
 167                 fmt += 2;
 168         }
 169         rsep = " ";
 170         if (strncmp(fmt, "NRS", 3) == 0) {
 171                 rsep = "";
 172                 fmt += 3;
 173         }
 174         if (showvalue == 0) {
 175                 /* Print just dash. */
 176                 sprintf(newfmt, "%s%%%ds%s", lsep, width, rsep);
 177                 printf(newfmt, "-");
 178                 return;
 179         }
 180
 181         if (hflag) {
 182                 char buf[5];
 183
 184                 /* Format in human readable form. */
 185                 humanize_number(buf, sizeof(buf), (int64_t)value, "",
 186                     HN_AUTOSCALE, HN_NOSPACE | HN_DECIMAL | \
 187                     ((div1000) ? HN_DIVISOR_1000 : 0));
 188                 sprintf(newfmt, "%s%%%ds%s", lsep, width, rsep);
 189                 printf(newfmt, buf);
 190         } else {
 191                 /* Construct the format string. */
 192                 sprintf(newfmt, "%s%%%d%s%s", lsep, width, fmt, rsep);
 193                 printf(newfmt, value);
 194         }
 195 }
 196
 197 /*
 198  * Find next multiaddr for a given interface name.
 199  */
 200 static struct ifmaddrs *
 201 next_ifma(struct ifmaddrs *ifma, const char *name, const sa_family_t family)
 202 {
 203
 204         for(; ifma != NULL; ifma = ifma->ifma_next) {
 205                 struct sockaddr_dl *sdl;
 206
 207                 sdl = (struct sockaddr_dl *)ifma->ifma_name;
 208                 if (ifma->ifma_addr->sa_family == family &&
 209                     strcmp(sdl->sdl_data, name) == 0)
 210                         break;
 211         }
 212
 213         return (ifma);
 214 }
 215
 216 /*
 217  * Print a description of the network interfaces.
 218  */
 219 void
 220 intpr(int interval, void (*pfunc)(char *), int af)
 221 {
 222         struct ifaddrs *ifap, *ifa;
 223         struct ifmaddrs *ifmap, *ifma;
 224         u_int ifn_len_max = 5;
 225
 226         if (interval)
 227                 return sidewaysintpr(interval);
 228
 229         if (getifaddrs(&ifap) != 0)
 230                 err(EX_OSERR, "getifaddrs");
 231         if (aflag && getifmaddrs(&ifmap) != 0)
 232                 err(EX_OSERR, "getifmaddrs");
 233
 234         if (Wflag) {
 235                 for (ifa = ifap; ifa; ifa = ifa->ifa_next) {
 236                         if (interface != NULL &&
 237                             strcmp(ifa->ifa_name, interface) != 0)
 238                                 continue;
 239                         if (af != AF_UNSPEC && ifa->ifa_addr->sa_family != af)
 240                                 continue;
 241                         ifn_len_max = MAX(ifn_len_max, strlen(ifa->ifa_name));
 242                 }
 243         }
 244
 245         if (!pfunc) {
 246                 printf("%-*.*s", ifn_len_max, ifn_len_max, "Name");
 247                 printf(" %5.5s %-13.13s %-17.17s %8.8s %5.5s %5.5s",
 248                     "Mtu", "Network", "Address", "Ipkts", "Ierrs", "Idrop");
 249                 if (bflag)
 250                         printf(" %10.10s","Ibytes");
 251                 printf(" %8.8s %5.5s", "Opkts", "Oerrs");
 252                 if (bflag)
 253                         printf(" %10.10s","Obytes");
 254                 printf(" %5s", "Coll");
 255                 if (dflag)
 256                         printf("  %s", "Drop");
 257                 putchar('\n');
 258         }
 259
 260         for (ifa = ifap; ifa; ifa = ifa->ifa_next) {
 261                 bool network = false, link = false;
 262
 263                 if (interface != NULL && strcmp(ifa->ifa_name, interface) != 0)
 264                         continue;
 265
 266                 if (pfunc) {
 267                         char *name;
 268
 269                         name = ifa->ifa_name;
 270                         (*pfunc)(name);
 271
 272                         /*
 273                          * Skip all ifaddrs belonging to same interface.
 274                          */
 275                         while(ifa->ifa_next != NULL &&
 276                             (strcmp(ifa->ifa_next->ifa_name, name) == 0)) {
 277                                 ifa = ifa->ifa_next;
 278                         }
 279                         continue;
 280                 }
 281
 282                 if (af != AF_UNSPEC && ifa->ifa_addr->sa_family != af)
 283                         continue;
 284
 285                 printf("%-*.*s", ifn_len_max, ifn_len_max, ifa->ifa_name);
 286
 287 #define IFA_MTU(ifa)    (((struct if_data *)(ifa)->ifa_data)->ifi_mtu)
 288                 show_stat("lu", 6, IFA_MTU(ifa), IFA_MTU(ifa), 0);
 289 #undef IFA_MTU
 290
 291                 switch (ifa->ifa_addr->sa_family) {
 292                 case AF_UNSPEC:
 293                         printf("%-13.13s ", "none");
 294                         printf("%-15.15s ", "none");
 295                         break;
 296                 case AF_INET:
 297                     {
 298                         struct sockaddr_in *sin, *mask;
 299
 300                         sin = (struct sockaddr_in *)ifa->ifa_addr;
 301                         mask = (struct sockaddr_in *)ifa->ifa_netmask;
 302                         printf("%-13.13s ", netname(sin->sin_addr.s_addr,
 303                             mask->sin_addr.s_addr));
 304                         printf("%-17.17s ",
 305                             routename(sin->sin_addr.s_addr));
 306
 307                         network = true;
 308                         break;
 309                     }
 310 #ifdef INET6
 311                 case AF_INET6:
 312                     {
 313                         struct sockaddr_in6 *sin6, *mask;
 314
 315                         sin6 = (struct sockaddr_in6 *)ifa->ifa_addr;
 316                         mask = (struct sockaddr_in6 *)ifa->ifa_netmask;
 317
 318                         printf("%-13.13s ", netname6(sin6, &mask->sin6_addr));
 319                         getnameinfo(ifa->ifa_addr, ifa->ifa_addr->sa_len,
 320                             addr_buf, sizeof(addr_buf), 0, 0, NI_NUMERICHOST);
 321                         printf("%-17.17s ", addr_buf);
 322
 323                         network = 1;
 324                         break;
 325                     }
 326 #endif /* INET6 */
 327                 case AF_IPX:
 328                     {
 329                         struct sockaddr_ipx *sipx;
 330                         u_long net;
 331                         char netnum[10];
 332
 333                         sipx = (struct sockaddr_ipx *)ifa->ifa_addr;
 334                         *(union ipx_net *) &net = sipx->sipx_addr.x_net;
 335
 336                         sprintf(netnum, "%lx", (u_long)ntohl(net));
 337                         printf("ipx:%-8s  ", netnum);
 338                         printf("%-17s ", ipx_phost((struct sockaddr *)sipx));
 339
 340                         network = 1;
 341                         break;
 342                     }
 343                 case AF_APPLETALK:
 344                         printf("atalk:%-12.12s ",
 345                             atalk_print(ifa->ifa_addr, 0x10));
 346                         printf("%-11.11s  ",
 347                             atalk_print(ifa->ifa_addr, 0x0b));
 348                         break;
 349                 case AF_LINK:
 350                     {
 351                         struct sockaddr_dl *sdl;
 352                         char *cp, linknum[10];
 353                         int n, m;
 354
 355                         sdl = (struct sockaddr_dl *)ifa->ifa_addr;
 356                         cp = (char *)LLADDR(sdl);
 357                         n = sdl->sdl_alen;
 358                         sprintf(linknum, "<Link#%d>", sdl->sdl_index);
 359                         m = printf("%-13.13s ", linknum);
 360
 361                         while ((--n >= 0) && (m < 30))
 362                                 m += printf("%02x%c", *cp++ & 0xff,
 363                                             n > 0 ? ':' : ' ');
 364                         m = 32 - m;
 365                         while (m-- > 0)
 366                                 putchar(' ');
 367
 368                         link = 1;
 369                         break;
 370                     }
 371                 }
 372
 373 #define IFA_STAT(s)     (((struct if_data *)ifa->ifa_data)->ifi_ ## s)
 374                 show_stat("lu", 8, IFA_STAT(ipackets), link|network, 1);
 375                 show_stat("lu", 5, IFA_STAT(ierrors), link, 1);
 376                 show_stat("lu", 5, IFA_STAT(iqdrops), link, 1);
 377                 if (bflag)
 378                         show_stat("lu", 10, IFA_STAT(ibytes), link|network, 0);
 379                 show_stat("lu", 8, IFA_STAT(opackets), link|network, 1);
 380                 show_stat("lu", 5, IFA_STAT(oerrors), link, 1);
 381                 if (bflag)
 382                         show_stat("lu", 10, IFA_STAT(obytes), link|network, 0);
 383                 show_stat("NRSlu", 5, IFA_STAT(collisions), link, 1);
 384                 if (dflag)
 385                         show_stat("LSlu", 5, IFA_STAT(oqdrops), link, 1);
 386                 putchar('\n');
 387
 388                 if (!aflag)
 389                         continue;
 390
 391                 /*
 392                  * Print family's multicast addresses.
 393                  */
 394                 for (ifma = next_ifma(ifmap, ifa->ifa_name,
 395                      ifa->ifa_addr->sa_family);
 396                      ifma != NULL;
 397                      ifma = next_ifma(ifma, ifa->ifa_name,
 398                      ifa->ifa_addr->sa_family)) {
 399                         const char *fmt = NULL;
 400
 401                         switch (ifma->ifma_addr->sa_family) {
 402                         case AF_INET:
 403                             {
 404                                 struct sockaddr_in *sin;
 405
 406                                 sin = (struct sockaddr_in *)ifma->ifma_addr;
 407                                 fmt = routename(sin->sin_addr.s_addr);
 408                                 break;
 409                             }
 410 #ifdef INET6
 411                         case AF_INET6:
 412
 413                                 /* in6_fillscopeid(&msa.in6); */
 414                                 getnameinfo(ifma->ifma_addr,
 415                                     ifma->ifma_addr->sa_len, addr_buf,
 416                                     sizeof(addr_buf), 0, 0, NI_NUMERICHOST);
 417                                 printf("%*s %s\n",
 418                                     Wflag ? 27 : 25, "", addr_buf);
 419                                 break;
 420 #endif /* INET6 */
 421                         case AF_LINK:
 422                             {
 423                                 struct sockaddr_dl *sdl;
 424
 425                                 sdl = (struct sockaddr_dl *)ifma->ifma_addr;
 426                                 switch (sdl->sdl_type) {
 427                                 case IFT_ETHER:
 428                                 case IFT_FDDI:
 429                                         fmt = ether_ntoa(
 430                                             (struct ether_addr *)LLADDR(sdl));
 431                                         break;
 432                                 }
 433                                 break;
 434                             }
 435                         }
 436
 437                         if (fmt) {
 438                                 printf("%*s %-17.17s",
 439                                     Wflag ? 27 : 25, "", fmt);
 440                                 if (ifma->ifma_addr->sa_family == AF_LINK) {
 441                                         printf(" %8lu", IFA_STAT(imcasts));
 442                                         printf("%*s", bflag ? 17 : 6, "");
 443                                         printf(" %8lu", IFA_STAT(omcasts));
 444                                 }
 445                                 putchar('\n');
 446                         }
 447
 448                         ifma = ifma->ifma_next;
 449                 }
 450         }
 451
 452         freeifaddrs(ifap);
 453         if (aflag)
 454                 freeifmaddrs(ifmap);
 455 }
 456
 457 struct iftot {
 458         u_long  ift_ip;                 /* input packets */
 459         u_long  ift_ie;                 /* input errors */
 460         u_long  ift_id;                 /* input drops */
 461         u_long  ift_op;                 /* output packets */
 462         u_long  ift_oe;                 /* output errors */
 463         u_long  ift_od;                 /* output drops */
 464         u_long  ift_co;                 /* collisions */
 465         u_long  ift_ib;                 /* input bytes */
 466         u_long  ift_ob;                 /* output bytes */
 467 };
 468
 469 /*
 470  * Obtain stats for interface(s).
 471  */
 472 static void
 473 fill_iftot(struct iftot *st)
 474 {
 475         struct ifaddrs *ifap, *ifa;
 476         bool found = false;
 477
 478         if (getifaddrs(&ifap) != 0)
 479                 err(EX_OSERR, "getifaddrs");
 480
 481         bzero(st, sizeof(*st));
 482
 483         for (ifa = ifap; ifa; ifa = ifa->ifa_next) {
 484                 if (ifa->ifa_addr->sa_family != AF_LINK)
 485                         continue;
 486                 if (interface) {
 487                         if (strcmp(ifa->ifa_name, interface) == 0)
 488                                 found = true;
 489                         else
 490                                 continue;
 491                 }
 492
 493                 st->ift_ip += IFA_STAT(ipackets);
 494                 st->ift_ie += IFA_STAT(ierrors);
 495                 st->ift_id += IFA_STAT(iqdrops);
 496                 st->ift_ib += IFA_STAT(ibytes);
 497                 st->ift_op += IFA_STAT(opackets);
 498                 st->ift_oe += IFA_STAT(oerrors);
 499                 st->ift_od += IFA_STAT(oqdrops);
 500                 st->ift_ob += IFA_STAT(obytes);
 501                 st->ift_co += IFA_STAT(collisions);
 502         }
 503
 504         if (interface && found == false)
 505                 err(EX_DATAERR, "interface %s not found", interface);
 506
 507         freeifaddrs(ifap);
 508 }
 509
 510 /*
 511  * Set a flag to indicate that a signal from the periodic itimer has been
 512  * caught.
 513  */
 514 static sig_atomic_t signalled;
 515 static void
 516 catchalarm(int signo __unused)
 517 {
 518         signalled = true;
 519 }
 520
 521 /*
 522  * Print a running summary of interface statistics.
 523  * Repeat display every interval seconds, showing statistics
 524  * collected over that interval.  Assumes that interval is non-zero.
 525  * First line printed at top of screen is always cumulative.
 526  */
 527 static void
 528 sidewaysintpr(int interval)
 529 {
 530         struct iftot ift[2], *new, *old;
 531         struct itimerval interval_it;
 532         int oldmask, line;
 533
 534         new = &ift[0];
 535         old = &ift[1];
 536         fill_iftot(old);
 537
 538         (void)signal(SIGALRM, catchalarm);
 539         signalled = false;
 540         interval_it.it_interval.tv_sec = interval;
 541         interval_it.it_interval.tv_usec = 0;
 542         interval_it.it_value = interval_it.it_interval;
 543         setitimer(ITIMER_REAL, &interval_it, NULL);
 544
 545 banner:
 546         printf("%17s %14s %16s", "input",
 547             interface != NULL ? interface : "(Total)", "output");
 548         putchar('\n');
 549         printf("%10s %5s %5s %10s %10s %5s %10s %5s",
 550             "packets", "errs", "idrops", "bytes", "packets", "errs", "bytes",
 551             "colls");
 552         if (dflag)
 553                 printf(" %5.5s", "drops");
 554         putchar('\n');
 555         fflush(stdout);
 556         line = 0;
 557
 558 loop:
 559         if ((noutputs != 0) && (--noutputs == 0))
 560                 exit(0);
 561         oldmask = sigblock(sigmask(SIGALRM));
 562         while (!signalled)
 563                 sigpause(0);
 564         signalled = false;
 565         sigsetmask(oldmask);
 566         line++;
 567
 568         fill_iftot(new);
 569
 570         show_stat("lu", 10, new->ift_ip - old->ift_ip, 1, 1);
 571         show_stat("lu", 5, new->ift_ie - old->ift_ie, 1, 1);
 572         show_stat("lu", 5, new->ift_id - old->ift_id, 1, 1);
 573         show_stat("lu", 10, new->ift_ib - old->ift_ib, 1, 0);
 574         show_stat("lu", 10, new->ift_op - old->ift_op, 1, 1);
 575         show_stat("lu", 5, new->ift_oe - old->ift_oe, 1, 1);
 576         show_stat("lu", 10, new->ift_ob - old->ift_ob, 1, 0);
 577         show_stat("NRSlu", 5, new->ift_co - old->ift_co, 1, 1);
 578         if (dflag)
 579                 show_stat("LSlu", 5, new->ift_od - old->ift_od, 1, 1);
 580         putchar('\n');
 581         fflush(stdout);
 582
 583         if (new == &ift[0]) {
 584                 new = &ift[1];
 585                 old = &ift[0];
 586         } else {
 587                 new = &ift[0];
 588                 old = &ift[1];
 589         }
 590
 591         if (line == 21)
 592                 goto banner;
 593         else
 594                 goto loop;
 595
 596         /* NOTREACHED */
 597 }