usr.bin/netstat/if.c

   1 /*
   2  * Copyright (c) 1983, 1988, 1993
   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  * @(#)if.c     8.3 (Berkeley) 4/28/95
  34  * $FreeBSD: src/usr.bin/netstat/if.c,v 1.32.2.9 2001/09/17 14:35:46 ru Exp $
  35  */
  36
  37 #define _KERNEL_STRUCTURES
  38 #include <sys/param.h>
  39 #include <sys/protosw.h>
  40 #include <sys/socket.h>
  41 #include <sys/sysctl.h>
  42 #include <sys/time.h>
  43
  44 #include <net/if.h>
  45 #include <net/if_var.h>
  46 #include <net/if_dl.h>
  47 #include <net/if_types.h>
  48 #include <net/ethernet.h>
  49 #include <netinet/in.h>
  50 #include <netinet/in_var.h>
  51 #include <netproto/ipx/ipx.h>
  52 #include <netproto/ipx/ipx_if.h>
  53 #ifdef ISO
  54 #include <netiso/iso.h>
  55 #include <netiso/iso_var.h>
  56 #endif
  57 #include <arpa/inet.h>
  58
  59 #include <signal.h>
  60 #include <stdio.h>
  61 #include <stdlib.h>
  62 #include <string.h>
  63 #include <unistd.h>
  64
  65 #include "netstat.h"
  66
  67 #define YES     1
  68 #define NO      0
  69
  70 static void sidewaysintpr (u_int, u_long, int);
  71 static void catchalarm (int);
  72
  73 #ifdef INET6
  74 static char ntop_buf[INET6_ADDRSTRLEN];         /* for inet_ntop() */
  75 #endif
  76
  77
  78 /*
  79  * Display a formatted value, or a '-' in the same space.
  80  */
  81 static void
  82 show_stat(const char *fmt, int width, u_long value, short showvalue)
  83 {
  84         char newfmt[32];
  85
  86         /* Construct the format string */
  87         if (showvalue) {
  88                 sprintf(newfmt, "%%%d%s", width, fmt);
  89                 printf(newfmt, value);
  90         } else {
  91                 sprintf(newfmt, "%%%ds", width);
  92                 printf(newfmt, "-");
  93         }
  94 }
  95
  96
  97
  98 /*
  99  * Print a description of the network interfaces.
 100  */
 101 void
 102 intpr(int interval1, u_long ifnetaddr, void (*pfunc)(char *), u_long ncpusaddr)
 103 {
 104         struct ifnet ifnet;
 105         struct ifdata_pcpu ifdata;
 106         struct ifaddr_container ifac;
 107         struct ifnethead ifnethead;
 108         union {
 109                 struct ifaddr ifa;
 110                 struct in_ifaddr in;
 111 #ifdef INET6
 112                 struct in6_ifaddr in6;
 113 #endif
 114                 struct ipx_ifaddr ipx;
 115 #ifdef ISO
 116                 struct iso_ifaddr iso;
 117 #endif
 118         } ifaddr;
 119         u_long ifaddraddr;
 120         u_long ifaddrcont_addr;
 121         u_long ifaddrfound;
 122         u_long ifdataaddr;
 123         u_long opackets;
 124         u_long ipackets;
 125         u_long obytes;
 126         u_long ibytes;
 127         u_long oerrors;
 128         u_long ierrors;
 129         u_long collisions;
 130         short timer;
 131         int drops;
 132         struct sockaddr *sa = NULL;
 133         char name[IFNAMSIZ];
 134         short network_layer;
 135         short link_layer;
 136         int ncpus;
 137
 138         if (kread(ncpusaddr, (char *)&ncpus, sizeof(ncpus)))
 139                 return;
 140
 141         if (ifnetaddr == 0) {
 142                 printf("ifnet: symbol not defined\n");
 143                 return;
 144         }
 145         if (interval1) {
 146                 sidewaysintpr((unsigned)interval1, ifnetaddr, ncpus);
 147                 return;
 148         }
 149         if (kread(ifnetaddr, (char *)&ifnethead, sizeof ifnethead))
 150                 return;
 151         ifnetaddr = (u_long)TAILQ_FIRST(&ifnethead);
 152         if (kread(ifnetaddr, (char *)&ifnet, sizeof ifnet))
 153                 return;
 154
 155         if (!pfunc) {
 156                 printf("%-7.7s %-5.5s %-13.13s %-15.15s %8.8s %5.5s",
 157                        "Name", "Mtu", "Network", "Address", "Ipkts", "Ierrs");
 158                 if (bflag)
 159                         printf(" %10.10s","Ibytes");
 160                 printf(" %8.8s %5.5s", "Opkts", "Oerrs");
 161                 if (bflag)
 162                         printf(" %10.10s","Obytes");
 163                 printf(" %5s", "Coll");
 164                 if (tflag)
 165                         printf(" %s", "Time");
 166                 if (dflag)
 167                         printf(" %s", "Drop");
 168                 putchar('\n');
 169         }
 170         ifaddraddr = 0;
 171         ifaddrcont_addr = 0;
 172         while (ifnetaddr || ifaddraddr) {
 173                 struct sockaddr_in *sin;
 174 #ifdef INET6
 175                 struct sockaddr_in6 *sin6;
 176 #endif
 177                 char *cp;
 178                 int n, m, cpu;
 179
 180                 network_layer = 0;
 181                 link_layer = 0;
 182
 183                 if (ifaddraddr == 0) {
 184                         struct ifaddrhead head;
 185
 186                         if (kread(ifnetaddr, (char *)&ifnet, sizeof ifnet))
 187                                 return;
 188                         strlcpy(name, ifnet.if_xname, sizeof(name));
 189                         ifnetaddr = (u_long)TAILQ_NEXT(&ifnet, if_link);
 190                         if (interface != 0 && (strcmp(name, interface) != 0))
 191                                 continue;
 192                         cp = strchr(name, '\0');
 193
 194                         if (pfunc) {
 195                                 (*pfunc)(name);
 196                                 continue;
 197                         }
 198
 199                         if ((ifnet.if_flags&IFF_UP) == 0)
 200                                 *cp++ = '*';
 201                         *cp = '\0';
 202
 203                         if (kread((u_long)ifnet.if_addrheads,
 204                                   (char *)&head, sizeof(head)))
 205                                 return;
 206
 207                         ifaddrcont_addr =
 208                                 (u_long)TAILQ_FIRST(&head);
 209                         if (ifaddrcont_addr == 0) {
 210                                 ifaddraddr = 0;
 211                         } else {
 212                                 if (kread(ifaddrcont_addr, (char *)&ifac,
 213                                           sizeof(ifac)))
 214                                         return;
 215                                 ifaddraddr = (u_long)ifac.ifa;
 216                         }
 217                 }
 218                 ifaddrfound = ifaddraddr;
 219
 220                 /*
 221                  * Get the interface stats.  These may get
 222                  * overriden below on a per-interface basis.
 223                  */
 224                 ifdataaddr = (u_long)ifnet.if_data_pcpu;
 225                 if (kread(ifdataaddr, (char *)&ifdata, sizeof(ifdata)))
 226                         return;
 227                 opackets = ifdata.ifd_opackets;
 228                 ipackets = ifdata.ifd_ipackets;
 229                 obytes = ifdata.ifd_obytes;
 230                 ibytes = ifdata.ifd_ibytes;
 231                 oerrors = ifdata.ifd_oerrors;
 232                 ierrors = ifdata.ifd_ierrors;
 233                 collisions = ifdata.ifd_collisions;
 234
 235                 for (cpu = 1; cpu < ncpus; ++cpu) {
 236                         if (kread(ifdataaddr + (cpu * sizeof(ifdata)),
 237                             (char *)&ifdata, sizeof(ifdata)))
 238                                 return;
 239                         opackets += ifdata.ifd_opackets;
 240                         ipackets += ifdata.ifd_ipackets;
 241                         obytes += ifdata.ifd_obytes;
 242                         ibytes += ifdata.ifd_ibytes;
 243                         oerrors += ifdata.ifd_oerrors;
 244                         ierrors += ifdata.ifd_ierrors;
 245                         collisions += ifdata.ifd_collisions;
 246                 }
 247
 248                 timer = ifnet.if_timer;
 249                 drops = 0;
 250
 251                 if (ifaddraddr == 0) {
 252                         printf("%-7.7s %-5lu ", name, ifnet.if_mtu);
 253                         printf("%-13.13s ", "none");
 254                         printf("%-15.15s ", "none");
 255                 } else {
 256                         if (kread(ifaddraddr, (char *)&ifaddr, sizeof ifaddr)) {
 257                                 ifaddraddr = 0;
 258                                 continue;
 259                         }
 260
 261                         ifaddr.ifa.if_ipackets = ifac.ifa_ipackets;
 262                         ifaddr.ifa.if_ibytes = ifac.ifa_ibytes;
 263                         ifaddr.ifa.if_opackets = ifac.ifa_opackets;
 264                         ifaddr.ifa.if_obytes = ifac.ifa_obytes;
 265                         for (cpu = 1; cpu < ncpus; ++cpu) {
 266                                 struct ifaddr_container nifac;
 267
 268                                 if (kread(ifaddrcont_addr +
 269                                     (cpu * sizeof(nifac)),
 270                                     (char *)&nifac, sizeof(nifac))) {
 271                                         ifaddraddr = 0;
 272                                         continue;
 273                                 }
 274                                 ifaddr.ifa.if_ipackets += nifac.ifa_ipackets;
 275                                 ifaddr.ifa.if_ibytes += nifac.ifa_ibytes;
 276                                 ifaddr.ifa.if_opackets += nifac.ifa_opackets;
 277                                 ifaddr.ifa.if_obytes += nifac.ifa_obytes;
 278                         }
 279
 280 #define CP(x) ((char *)(x))
 281                         cp = (CP(ifaddr.ifa.ifa_addr) - CP(ifaddraddr)) +
 282                                 CP(&ifaddr);
 283                         sa = (struct sockaddr *)cp;
 284                         if (af != AF_UNSPEC && sa->sa_family != af) {
 285                                 ifaddrcont_addr =
 286                                         (u_long)TAILQ_NEXT(&ifac, ifa_link);
 287                                 if (ifaddrcont_addr == 0) {
 288                                         ifaddraddr = 0;
 289                                 } else {
 290                                         if (kread(ifaddrcont_addr,
 291                                             (char *)&ifac, sizeof(ifac))) {
 292                                                 ifaddraddr = 0;
 293                                                 continue;
 294                                         }
 295                                         ifaddraddr = (u_long)ifac.ifa;
 296                                 }
 297                                 continue;
 298                         }
 299                         printf("%-7.7s %-5lu ", name, ifnet.if_mtu);
 300                         switch (sa->sa_family) {
 301                         case AF_UNSPEC:
 302                                 printf("%-13.13s ", "none");
 303                                 printf("%-15.15s ", "none");
 304                                 break;
 305                         case AF_INET:
 306                                 sin = (struct sockaddr_in *)sa;
 307 #ifdef notdef
 308                                 /* can't use inet_makeaddr because kernel
 309                                  * keeps nets unshifted.
 310                                  */
 311                                 in = inet_makeaddr(ifaddr.in.ia_subnet,
 312                                         INADDR_ANY);
 313                                 printf("%-13.13s ", netname(in.s_addr,
 314                                     ifaddr.in.ia_subnetmask));
 315 #else
 316                                 printf("%-13.13s ",
 317                                     netname(htonl(ifaddr.in.ia_subnet),
 318                                     ifaddr.in.ia_subnetmask));
 319 #endif
 320                                 printf("%-15.15s ",
 321                                     routename(sin->sin_addr.s_addr));
 322
 323                                 network_layer = 1;
 324                                 break;
 325 #ifdef INET6
 326                         case AF_INET6:
 327                                 sin6 = (struct sockaddr_in6 *)sa;
 328                                 printf("%-11.11s ",
 329                                        netname6(&ifaddr.in6.ia_addr,
 330                                                 &ifaddr.in6.ia_prefixmask.sin6_addr));
 331                                 printf("%-17.17s ",
 332                                     inet_ntop(AF_INET6,
 333                                         &sin6->sin6_addr,
 334                                         ntop_buf, sizeof(ntop_buf)));
 335
 336                                 network_layer = 1;
 337                                 break;
 338 #endif /*INET6*/
 339                         case AF_IPX:
 340                                 {
 341                                 struct sockaddr_ipx *sipx =
 342                                         (struct sockaddr_ipx *)sa;
 343                                 u_long net;
 344                                 char netnum[10];
 345
 346                                 *(union ipx_net *) &net = sipx->sipx_addr.x_net;
 347                                 sprintf(netnum, "%lx", (u_long)ntohl(net));
 348                                 printf("ipx:%-8s  ", netnum);
 349 /*                              printf("ipx:%-8s ", netname(net, 0L)); */
 350                                 printf("%-15s ",
 351                                     ipx_phost((struct sockaddr *)sipx));
 352                                 }
 353                                 break;
 354
 355                         case AF_LINK:
 356                                 {
 357                                 struct sockaddr_dl *sdl =
 358                                         (struct sockaddr_dl *)sa;
 359                                 char linknum[10];
 360                                 cp = (char *)LLADDR(sdl);
 361                                 n = sdl->sdl_alen;
 362                                 sprintf(linknum, "<Link#%d>", sdl->sdl_index);
 363                                 m = printf("%-11.11s ", linknum);
 364                                 }
 365                                 goto hexprint;
 366                         default:
 367                                 m = printf("(%d)", sa->sa_family);
 368                                 for (cp = sa->sa_len + (char *)sa;
 369                                         --cp > sa->sa_data && (*cp == 0);) {}
 370                                 n = cp - sa->sa_data + 1;
 371                                 cp = sa->sa_data;
 372                         hexprint:
 373                                 while (--n >= 0)
 374                                         m += printf("%02x%c", *cp++ & 0xff,
 375                                                     n > 0 ? ':' : ' ');
 376                                 m = 30 - m;
 377                                 while (m-- > 0)
 378                                         putchar(' ');
 379
 380                                 link_layer = 1;
 381                                 break;
 382                         }
 383
 384                         /*
 385                          * Fixup the statistics for interfaces that
 386                          * update stats for their network addresses
 387                          */
 388                         if (network_layer) {
 389                                 opackets = ifaddr.ifa.if_opackets;
 390                                 ipackets = ifaddr.ifa.if_ipackets;
 391                                 obytes = ifaddr.ifa.if_obytes;
 392                                 ibytes = ifaddr.ifa.if_ibytes;
 393                         }
 394
 395                         ifaddrcont_addr =
 396                                 (u_long)TAILQ_NEXT(&ifac, ifa_link);
 397                         if (ifaddrcont_addr == 0) {
 398                                 ifaddraddr = 0;
 399                         } else {
 400                                 if (kread(ifaddrcont_addr,
 401                                     (char *)&ifac, sizeof(ifac))) {
 402                                         ifaddraddr = 0;
 403                                 } else {
 404                                         ifaddraddr = (u_long)ifac.ifa;
 405                                 }
 406                         }
 407                 }
 408
 409                 show_stat("lu", 8, ipackets, link_layer|network_layer);
 410                 printf(" ");
 411                 show_stat("lu", 5, ierrors, link_layer);
 412                 printf(" ");
 413                 if (bflag) {
 414                         show_stat("lu", 10, ibytes, link_layer|network_layer);
 415                         printf(" ");
 416                 }
 417                 show_stat("lu", 8, opackets, link_layer|network_layer);
 418                 printf(" ");
 419                 show_stat("lu", 5, oerrors, link_layer);
 420                 printf(" ");
 421                 if (bflag) {
 422                         show_stat("lu", 10, obytes, link_layer|network_layer);
 423                         printf(" ");
 424                 }
 425                 show_stat("lu", 5, collisions, link_layer);
 426                 if (tflag) {
 427                         printf(" ");
 428                         show_stat("d", 3, timer, link_layer);
 429                 }
 430                 if (dflag) {
 431                         printf(" ");
 432                         show_stat("d", 3, drops, link_layer);
 433                 }
 434                 putchar('\n');
 435                 if (aflag && ifaddrfound) {
 436                         /*
 437                          * Print family's multicast addresses
 438                          */
 439                         struct ifmultiaddr *multiaddr;
 440                         struct ifmultiaddr ifma;
 441                         union {
 442                                 struct sockaddr sa;
 443                                 struct sockaddr_in in;
 444 #ifdef INET6
 445                                 struct sockaddr_in6 in6;
 446 #endif /* INET6 */
 447                                 struct sockaddr_dl dl;
 448                         } msa;
 449                         const char *fmt;
 450
 451                         TAILQ_FOREACH(multiaddr, &ifnet.if_multiaddrs, ifma_link) {
 452                                 if (kread((u_long)multiaddr, (char *)&ifma,
 453                                           sizeof ifma))
 454                                         break;
 455                                 multiaddr = &ifma;
 456                                 if (kread((u_long)ifma.ifma_addr, (char *)&msa,
 457                                           sizeof msa))
 458                                         break;
 459                                 if (msa.sa.sa_family != sa->sa_family)
 460                                         continue;
 461
 462                                 fmt = NULL;
 463                                 switch (msa.sa.sa_family) {
 464                                 case AF_INET:
 465                                         fmt = routename(msa.in.sin_addr.s_addr);
 466                                         break;
 467 #ifdef INET6
 468                                 case AF_INET6:
 469                                         printf("%23s %-19.19s(refs: %d)\n", "",
 470                                                inet_ntop(AF_INET6,
 471                                                          &msa.in6.sin6_addr,
 472                                                          ntop_buf,
 473                                                          sizeof(ntop_buf)),
 474                                                ifma.ifma_refcount);
 475                                         break;
 476 #endif /* INET6 */
 477                                 case AF_LINK:
 478                                         switch (msa.dl.sdl_type) {
 479                                         case IFT_ETHER:
 480                                         case IFT_FDDI:
 481                                                 fmt = ether_ntoa(
 482                                                         (struct ether_addr *)
 483                                                         LLADDR(&msa.dl));
 484                                                 break;
 485                                         }
 486                                         break;
 487                                 }
 488                                 if (fmt)
 489                                         printf("%23s %s\n", "", fmt);
 490                         }
 491                 }
 492         }
 493 }
 494
 495 struct  iftot {
 496         SLIST_ENTRY(iftot) chain;
 497         char    ift_name[IFNAMSIZ];     /* interface name */
 498         u_long  ift_ip;                 /* input packets */
 499         u_long  ift_ie;                 /* input errors */
 500         u_long  ift_op;                 /* output packets */
 501         u_long  ift_oe;                 /* output errors */
 502         u_long  ift_co;                 /* collisions */
 503         u_int   ift_dr;                 /* drops */
 504         u_long  ift_ib;                 /* input bytes */
 505         u_long  ift_ob;                 /* output bytes */
 506 };
 507
 508 u_char  signalled;                      /* set if alarm goes off "early" */
 509
 510 /*
 511  * Print a running summary of interface statistics.
 512  * Repeat display every interval1 seconds, showing statistics
 513  * collected over that interval.  Assumes that interval1 is non-zero.
 514  * First line printed at top of screen is always cumulative.
 515  * XXX - should be rewritten to use ifmib(4).
 516  */
 517 static void
 518 sidewaysintpr(unsigned interval1, u_long off, int ncpus)
 519 {
 520         struct ifnet ifnet;
 521         u_long firstifnet;
 522         struct ifnethead ifnethead;
 523         struct ifdata_pcpu ifdata;
 524         struct iftot *iftot, *ip, *ipn, *total, *sum, *interesting;
 525         int line, cpu;
 526         int oldmask, first;
 527         u_long interesting_off;
 528         u_long ifdata_addr;
 529
 530         if (kread(off, (char *)&ifnethead, sizeof ifnethead))
 531                 return;
 532         firstifnet = (u_long)TAILQ_FIRST(&ifnethead);
 533
 534         if ((iftot = malloc(sizeof(struct iftot))) == NULL) {
 535                 printf("malloc failed\n");
 536                 exit(1);
 537         }
 538         memset(iftot, 0, sizeof(struct iftot));
 539
 540         interesting = NULL;
 541         interesting_off = 0;
 542         for (off = firstifnet, ip = iftot; off;) {
 543                 char name[IFNAMSIZ];
 544
 545                 if (kread(off, (char *)&ifnet, sizeof ifnet))
 546                         break;
 547                 strlcpy(name, ifnet.if_xname, sizeof(name));
 548                 if (interface && strcmp(name, interface) == 0) {
 549                         interesting = ip;
 550                         interesting_off = off;
 551                 }
 552                 snprintf(ip->ift_name, 16, "(%s)", name);
 553                 if ((ipn = malloc(sizeof(struct iftot))) == NULL) {
 554                         printf("malloc failed\n");
 555                         exit(1);
 556                 }
 557                 memset(ipn, 0, sizeof(struct iftot));
 558                 SLIST_NEXT(ip, chain) = ipn;
 559                 ip = ipn;
 560                 off = (u_long)TAILQ_NEXT(&ifnet, if_link);
 561         }
 562         if ((total = malloc(sizeof(struct iftot))) == NULL) {
 563                 printf("malloc failed\n");
 564                 exit(1);
 565         }
 566         memset(total, 0, sizeof(struct iftot));
 567         if ((sum = malloc(sizeof(struct iftot))) == NULL) {
 568                 printf("malloc failed\n");
 569                 exit(1);
 570         }
 571         memset(sum, 0, sizeof(struct iftot));
 572
 573
 574         (void)signal(SIGALRM, catchalarm);
 575         signalled = NO;
 576         (void)alarm(interval1);
 577         first = 1;
 578 banner:
 579         printf("%17s %14s %16s", "input",
 580             interesting ? interesting->ift_name : "(Total)", "output");
 581         putchar('\n');
 582         printf("%10s %5s %10s %10s %5s %10s %5s",
 583             "packets", "errs", "bytes", "packets", "errs", "bytes", "colls");
 584         if (dflag)
 585                 printf(" %5.5s", "drops");
 586         putchar('\n');
 587         fflush(stdout);
 588         line = 0;
 589 loop:
 590         if (interesting != NULL) {
 591                 ip = interesting;
 592                 if (kread(interesting_off, (char *)&ifnet, sizeof ifnet)) {
 593                         printf("???\n");
 594                         exit(1);
 595                 }
 596
 597                 ifdata_addr = (u_long)ifnet.if_data_pcpu;
 598                 if (kread(ifdata_addr, (char *)&ifdata, sizeof(ifdata))) {
 599                         printf("ifdata 1\n");
 600                         exit(1);
 601                 }
 602                 ifnet.if_ipackets = ifdata.ifd_ipackets;
 603                 ifnet.if_ierrors = ifdata.ifd_ierrors;
 604                 ifnet.if_ibytes = ifdata.ifd_ibytes;
 605                 ifnet.if_opackets = ifdata.ifd_opackets;
 606                 ifnet.if_oerrors = ifdata.ifd_oerrors;
 607                 ifnet.if_obytes = ifdata.ifd_obytes;
 608                 ifnet.if_collisions = ifdata.ifd_collisions;
 609
 610                 for (cpu = 1; cpu < ncpus; ++cpu) {
 611                         if (kread(ifdata_addr + (cpu * sizeof(ifdata)),
 612                             (char *)&ifdata, sizeof(ifdata))) {
 613                                 printf("ifdata 2\n");
 614                                 exit(1);
 615                         }
 616                         ifnet.if_ipackets += ifdata.ifd_ipackets;
 617                         ifnet.if_ierrors += ifdata.ifd_ierrors;
 618                         ifnet.if_ibytes += ifdata.ifd_ibytes;
 619                         ifnet.if_opackets += ifdata.ifd_opackets;
 620                         ifnet.if_oerrors += ifdata.ifd_oerrors;
 621                         ifnet.if_obytes += ifdata.ifd_obytes;
 622                         ifnet.if_collisions += ifdata.ifd_collisions;
 623                 }
 624
 625                 if (!first) {
 626                         printf("%10lu %5lu %10lu %10lu %5lu %10lu %5lu",
 627                                 ifnet.if_ipackets - ip->ift_ip,
 628                                 ifnet.if_ierrors - ip->ift_ie,
 629                                 ifnet.if_ibytes - ip->ift_ib,
 630                                 ifnet.if_opackets - ip->ift_op,
 631                                 ifnet.if_oerrors - ip->ift_oe,
 632                                 ifnet.if_obytes - ip->ift_ob,
 633                                 ifnet.if_collisions - ip->ift_co);
 634                         if (dflag)
 635                                 printf(" %5u", 0 - ip->ift_dr);
 636                 }
 637                 ip->ift_ip = ifnet.if_ipackets;
 638                 ip->ift_ie = ifnet.if_ierrors;
 639                 ip->ift_ib = ifnet.if_ibytes;
 640                 ip->ift_op = ifnet.if_opackets;
 641                 ip->ift_oe = ifnet.if_oerrors;
 642                 ip->ift_ob = ifnet.if_obytes;
 643                 ip->ift_co = ifnet.if_collisions;
 644                 ip->ift_dr = 0;
 645         } else {
 646                 sum->ift_ip = 0;
 647                 sum->ift_ie = 0;
 648                 sum->ift_ib = 0;
 649                 sum->ift_op = 0;
 650                 sum->ift_oe = 0;
 651                 sum->ift_ob = 0;
 652                 sum->ift_co = 0;
 653                 sum->ift_dr = 0;
 654                 for (off = firstifnet, ip = iftot;
 655                      off && SLIST_NEXT(ip, chain) != NULL;
 656                      ip = SLIST_NEXT(ip, chain)) {
 657                         if (kread(off, (char *)&ifnet, sizeof ifnet)) {
 658                                 off = 0;
 659                                 continue;
 660                         }
 661
 662                         ifdata_addr = (u_long)ifnet.if_data_pcpu;
 663                         if (kread(ifdata_addr, (char *)&ifdata,
 664                             sizeof(ifdata))) {
 665                                 printf("ifdata 3\n");
 666                                 exit(1);
 667                         }
 668                         ifnet.if_ipackets = ifdata.ifd_ipackets;
 669                         ifnet.if_ierrors = ifdata.ifd_ierrors;
 670                         ifnet.if_ibytes = ifdata.ifd_ibytes;
 671                         ifnet.if_opackets = ifdata.ifd_opackets;
 672                         ifnet.if_oerrors = ifdata.ifd_oerrors;
 673                         ifnet.if_obytes = ifdata.ifd_obytes;
 674                         ifnet.if_collisions = ifdata.ifd_collisions;
 675
 676                         for (cpu = 1; cpu < ncpus; ++cpu) {
 677                                 if (kread(ifdata_addr + (cpu * sizeof(ifdata)),
 678                                     (char *)&ifdata, sizeof(ifdata))) {
 679                                         printf("ifdata 2\n");
 680                                         exit(1);
 681                                 }
 682                                 ifnet.if_ipackets += ifdata.ifd_ipackets;
 683                                 ifnet.if_ierrors += ifdata.ifd_ierrors;
 684                                 ifnet.if_ibytes += ifdata.ifd_ibytes;
 685                                 ifnet.if_opackets += ifdata.ifd_opackets;
 686                                 ifnet.if_oerrors += ifdata.ifd_oerrors;
 687                                 ifnet.if_obytes += ifdata.ifd_obytes;
 688                                 ifnet.if_collisions += ifdata.ifd_collisions;
 689                         }
 690
 691                         sum->ift_ip += ifnet.if_ipackets;
 692                         sum->ift_ie += ifnet.if_ierrors;
 693                         sum->ift_ib += ifnet.if_ibytes;
 694                         sum->ift_op += ifnet.if_opackets;
 695                         sum->ift_oe += ifnet.if_oerrors;
 696                         sum->ift_ob += ifnet.if_obytes;
 697                         sum->ift_co += ifnet.if_collisions;
 698                         sum->ift_dr += 0;
 699                         off = (u_long)TAILQ_NEXT(&ifnet, if_link);
 700                 }
 701                 if (!first) {
 702                         printf("%10lu %5lu %10lu %10lu %5lu %10lu %5lu",
 703                                 sum->ift_ip - total->ift_ip,
 704                                 sum->ift_ie - total->ift_ie,
 705                                 sum->ift_ib - total->ift_ib,
 706                                 sum->ift_op - total->ift_op,
 707                                 sum->ift_oe - total->ift_oe,
 708                                 sum->ift_ob - total->ift_ob,
 709                                 sum->ift_co - total->ift_co);
 710                         if (dflag)
 711                                 printf(" %5u", sum->ift_dr - total->ift_dr);
 712                 }
 713                 *total = *sum;
 714         }
 715         if (!first)
 716                 putchar('\n');
 717         fflush(stdout);
 718         oldmask = sigblock(sigmask(SIGALRM));
 719         if (! signalled) {
 720                 sigpause(0);
 721         }
 722         sigsetmask(oldmask);
 723         signalled = NO;
 724         (void)alarm(interval1);
 725         line++;
 726         first = 0;
 727         if (line == 21)
 728                 goto banner;
 729         else
 730                 goto loop;
 731         /*NOTREACHED*/
 732 }
 733
 734 /*
 735  * Called if an interval expires before sidewaysintpr has completed a loop.
 736  * Sets a flag to not wait for the alarm.
 737  */
 738 static void
 739 catchalarm(int signo __unused)
 740 {
 741         signalled = YES;
 742 }