usr.bin/netstat/mroute.c

   1 /*-
   2  * Copyright (c) 1989 Stephen Deering
   3  * Copyright (c) 1992, 1993
   4  *      The Regents of the University of California.  All rights reserved.
   5  *
   6  * This code is derived from software contributed to Berkeley by
   7  * Stephen Deering of Stanford University.
   8  *
   9  * Redistribution and use in source and binary forms, with or without
  10  * modification, are permitted provided that the following conditions
  11  * are met:
  12  * 1. Redistributions of source code must retain the above copyright
  13  *    notice, this list of conditions and the following disclaimer.
  14  * 2. Redistributions in binary form must reproduce the above copyright
  15  *    notice, this list of conditions and the following disclaimer in the
  16  *    documentation and/or other materials provided with the distribution.
  17  * 3. All advertising materials mentioning features or use of this software
  18  *    must display the following acknowledgement:
  19  *      This product includes software developed by the University of
  20  *      California, Berkeley and its contributors.
  21  * 4. Neither the name of the University nor the names of its contributors
  22  *    may be used to endorse or promote products derived from this software
  23  *    without specific prior written permission.
  24  *
  25  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  26  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  27  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  28  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  29  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  30  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  31  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  32  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  33  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  34  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  35  * SUCH DAMAGE.
  36  *
  37  *      @(#)mroute.c    8.2 (Berkeley) 4/28/95
  38  */
  39
  40 #include <sys/cdefs.h>
  41 __FBSDID("$FreeBSD$");
  42
  43 /*
  44  * Print multicast routing structures and statistics.
  45  *
  46  * MROUTING 1.0
  47  */
  48
  49 #include <sys/param.h>
  50 #include <sys/queue.h>
  51 #include <sys/socket.h>
  52 #include <sys/socketvar.h>
  53 #include <sys/sysctl.h>
  54 #include <sys/protosw.h>
  55 #include <sys/mbuf.h>
  56 #include <sys/time.h>
  57
  58 #include <net/if.h>
  59 #include <netinet/in.h>
  60 #include <netinet/igmp.h>
  61 #include <net/route.h>
  62
  63 #define _KERNEL 1
  64 #include <netinet/ip_mroute.h>
  65 #undef _KERNEL
  66
  67 #include <err.h>
  68 #include <stdint.h>
  69 #include <stdio.h>
  70 #include <stdlib.h>
  71 #include <stdbool.h>
  72 #include <string.h>
  73 #include <libxo/xo.h>
  74 #include "netstat.h"
  75 #include "nl_defs.h"
  76
  77 static void     print_bw_meter(struct bw_meter *, int *);
  78 static void     print_mfc(struct mfc *, int, int *);
  79
  80 static void
  81 print_bw_meter(struct bw_meter *bw_meter, int *banner_printed)
  82 {
  83         char s1[256], s2[256], s3[256];
  84         struct timeval now, end, delta;
  85
  86         gettimeofday(&now, NULL);
  87
  88         if (! *banner_printed) {
  89                 xo_open_list("bandwidth-meter");
  90                 xo_emit(" {T:Bandwidth Meters}\n");
  91                 xo_emit("  {T:/%-30s}", "Measured(Start|Packets|Bytes)");
  92                 xo_emit(" {T:/%s}", "Type");
  93                 xo_emit("  {T:/%-30s}", "Thresh(Interval|Packets|Bytes)");
  94                 xo_emit(" {T:Remain}");
  95                 xo_emit("\n");
  96                 *banner_printed = 1;
  97         }
  98
  99         xo_open_instance("bandwidth-meter");
 100
 101         /* The measured values */
 102         if (bw_meter->bm_flags & BW_METER_UNIT_PACKETS) {
 103                 snprintf(s1, sizeof(s1), "%ju",
 104                     (uintmax_t)bw_meter->bm_measured.b_packets);
 105                 xo_emit("{e:measured-packets/%ju}",
 106                     (uintmax_t)bw_meter->bm_measured.b_packets);
 107         } else
 108                 strcpy(s1, "?");
 109         if (bw_meter->bm_flags & BW_METER_UNIT_BYTES) {
 110                 snprintf(s2, sizeof(s2), "%ju",
 111                     (uintmax_t)bw_meter->bm_measured.b_bytes);
 112                 xo_emit("{e:measured-bytes/%ju}",
 113                     (uintmax_t)bw_meter->bm_measured.b_bytes);
 114         } else
 115                 strcpy(s2, "?");
 116         xo_emit("  {[:-30}{:start-time/%lu.%06lu}|{q:measured-packets/%s}"
 117             "|{q:measured-bytes%s}{]:}",
 118             (u_long)bw_meter->bm_start_time.tv_sec,
 119             (u_long)bw_meter->bm_start_time.tv_usec, s1, s2);
 120
 121         /* The type of entry */
 122         xo_emit("  {t:type/%-3s}", (bw_meter->bm_flags & BW_METER_GEQ) ? ">=" :
 123             (bw_meter->bm_flags & BW_METER_LEQ) ? "<=" : "?");
 124
 125         /* The threshold values */
 126         if (bw_meter->bm_flags & BW_METER_UNIT_PACKETS) {
 127                 snprintf(s1, sizeof(s1), "%ju",
 128                     (uintmax_t)bw_meter->bm_threshold.b_packets);
 129                 xo_emit("{e:threshold-packets/%ju}",
 130                     (uintmax_t)bw_meter->bm_threshold.b_packets);
 131         } else
 132                 strcpy(s1, "?");
 133         if (bw_meter->bm_flags & BW_METER_UNIT_BYTES) {
 134                 snprintf(s2, sizeof(s2), "%ju",
 135                     (uintmax_t)bw_meter->bm_threshold.b_bytes);
 136                 xo_emit("{e:threshold-bytes/%ju}",
 137                     (uintmax_t)bw_meter->bm_threshold.b_bytes);
 138         } else
 139                 strcpy(s2, "?");
 140
 141         xo_emit("  {[:-30}{:threshold-time/%lu.%06lu}|{q:threshold-packets/%s}"
 142             "|{q:threshold-bytes%s}{]:}",
 143             (u_long)bw_meter->bm_threshold.b_time.tv_sec,
 144             (u_long)bw_meter->bm_threshold.b_time.tv_usec, s1, s2);
 145
 146         /* Remaining time */
 147         timeradd(&bw_meter->bm_start_time,
 148                  &bw_meter->bm_threshold.b_time, &end);
 149         if (timercmp(&now, &end, <=)) {
 150                 timersub(&end, &now, &delta);
 151                 snprintf(s3, sizeof(s3), "%lu.%06lu",
 152                         (u_long)delta.tv_sec,
 153                         (u_long)delta.tv_usec);
 154         } else {
 155                 /* Negative time */
 156                 timersub(&now, &end, &delta);
 157                 snprintf(s3, sizeof(s3), "-%lu.06%lu",
 158                         (u_long)delta.tv_sec,
 159                         (u_long)delta.tv_usec);
 160         }
 161         xo_emit(" {:remaining-time/%s}", s3);
 162
 163         xo_open_instance("bandwidth-meter");
 164
 165         xo_emit("\n");
 166 }
 167
 168 static void
 169 print_mfc(struct mfc *m, int maxvif, int *banner_printed)
 170 {
 171         struct sockaddr_in sin;
 172         struct sockaddr *sa = (struct sockaddr *)&sin;
 173         struct bw_meter bw_meter, *bwm;
 174         int bw_banner_printed;
 175         int error;
 176         vifi_t vifi;
 177
 178         bw_banner_printed = 0;
 179         memset(&sin, 0, sizeof(sin));
 180         sin.sin_len = sizeof(sin);
 181         sin.sin_family = AF_INET;
 182
 183         if (! *banner_printed) {
 184                 xo_open_list("multicast-forwarding-entry");
 185                 xo_emit("\n{T:IPv4 Multicast Forwarding Table}\n"
 186                     " {T:Origin}          {T:Group}            "
 187                     " {T:Packets In-Vif}  {T:Out-Vifs:Ttls}\n");
 188                 *banner_printed = 1;
 189         }
 190
 191         memcpy(&sin.sin_addr, &m->mfc_origin, sizeof(sin.sin_addr));
 192         xo_emit(" {:origin-address/%-15.15s}", routename(sa, numeric_addr));
 193         memcpy(&sin.sin_addr, &m->mfc_mcastgrp, sizeof(sin.sin_addr));
 194         xo_emit(" {:group-address/%-15.15s}",
 195             routename(sa, numeric_addr));
 196         xo_emit(" {:sent-packets/%9lu}", m->mfc_pkt_cnt);
 197         xo_emit("  {:parent/%3d}   ", m->mfc_parent);
 198         xo_open_list("vif-ttl");
 199         for (vifi = 0; vifi <= maxvif; vifi++) {
 200                 if (m->mfc_ttls[vifi] > 0) {
 201                         xo_open_instance("vif-ttl");
 202                         xo_emit(" {k:vif/%u}:{:ttl/%u}", vifi,
 203                             m->mfc_ttls[vifi]);
 204                         xo_close_instance("vif-ttl");
 205                 }
 206         }
 207         xo_close_list("vif-ttl");
 208         xo_emit("\n");
 209
 210         /*
 211          * XXX We break the rules and try to use KVM to read the
 212          * bandwidth meters, they are not retrievable via sysctl yet.
 213          */
 214         bwm = m->mfc_bw_meter;
 215         while (bwm != NULL) {
 216                 error = kread((u_long)bwm, (char *)&bw_meter,
 217                     sizeof(bw_meter));
 218                 if (error)
 219                         break;
 220                 print_bw_meter(&bw_meter, &bw_banner_printed);
 221                 bwm = bw_meter.bm_mfc_next;
 222         }
 223         if (banner_printed)
 224                 xo_close_list("bandwidth-meter");
 225 }
 226
 227 void
 228 mroutepr()
 229 {
 230         struct sockaddr_in sin;
 231         struct sockaddr *sa = (struct sockaddr *)&sin;
 232         struct vif viftable[MAXVIFS];
 233         struct vif *v;
 234         struct mfc *m;
 235         u_long pmfchashtbl, pmfctablesize, pviftbl;
 236         int banner_printed;
 237         int saved_numeric_addr;
 238         size_t len;
 239         vifi_t vifi, maxvif;
 240
 241         saved_numeric_addr = numeric_addr;
 242         numeric_addr = 1;
 243
 244         memset(&sin, 0, sizeof(sin));
 245         sin.sin_len = sizeof(sin);
 246         sin.sin_family = AF_INET;
 247
 248         /*
 249          * TODO:
 250          * The VIF table will move to hanging off the struct if_info for
 251          * each IPv4 configured interface. Currently it is statically
 252          * allocated, and retrieved either using KVM or an opaque SYSCTL.
 253          *
 254          * This can't happen until the API documented in multicast(4)
 255          * is itself refactored. The historical reason why VIFs use
 256          * a separate ifindex space is entirely due to the legacy
 257          * capability of the MROUTING code to create IPIP tunnels on
 258          * the fly to support DVMRP. When gif(4) became available, this
 259          * functionality was deprecated, as PIM does not use it.
 260          */
 261         maxvif = 0;
 262         pmfchashtbl = pmfctablesize = pviftbl = 0;
 263
 264         len = sizeof(viftable);
 265         if (live) {
 266                 if (sysctlbyname("net.inet.ip.viftable", viftable, &len, NULL,
 267                     0) < 0) {
 268                         xo_warn("sysctl: net.inet.ip.viftable");
 269                         return;
 270                 }
 271         } else {
 272                 pmfchashtbl = nl[N_MFCHASHTBL].n_value;
 273                 pmfctablesize = nl[N_MFCTABLESIZE].n_value;
 274                 pviftbl = nl[N_VIFTABLE].n_value;
 275
 276                 if (pmfchashtbl == 0 || pmfctablesize == 0 || pviftbl == 0) {
 277                         xo_warnx("No IPv4 MROUTING kernel support.");
 278                         return;
 279                 }
 280
 281                 kread(pviftbl, (char *)viftable, sizeof(viftable));
 282         }
 283
 284         banner_printed = 0;
 285         for (vifi = 0, v = viftable; vifi < MAXVIFS; ++vifi, ++v) {
 286                 if (v->v_lcl_addr.s_addr == 0)
 287                         continue;
 288
 289                 maxvif = vifi;
 290                 if (!banner_printed) {
 291                         xo_emit("\n{T:IPv4 Virtual Interface Table\n"
 292                             " Vif   Thresh   Local-Address   "
 293                             "Remote-Address    Pkts-In   Pkts-Out}\n");
 294                         banner_printed = 1;
 295                         xo_open_list("vif");
 296                 }
 297
 298                 xo_open_instance("vif");
 299                 memcpy(&sin.sin_addr, &v->v_lcl_addr, sizeof(sin.sin_addr));
 300                 xo_emit(" {:vif/%2u}    {:threshold/%6u}   {:route/%-15.15s}",
 301                                         /* opposite math of add_vif() */
 302                     vifi, v->v_threshold,
 303                     routename(sa, numeric_addr));
 304                 memcpy(&sin.sin_addr, &v->v_rmt_addr, sizeof(sin.sin_addr));
 305                 xo_emit(" {:source/%-15.15s}", (v->v_flags & VIFF_TUNNEL) ?
 306                     routename(sa, numeric_addr) : "");
 307
 308                 xo_emit(" {:received-packets/%9lu}  {:sent-packets/%9lu}\n",
 309                     v->v_pkt_in, v->v_pkt_out);
 310                 xo_close_instance("vif");
 311         }
 312         if (banner_printed)
 313                 xo_close_list("vif");
 314         else
 315                 xo_emit("\n{T:IPv4 Virtual Interface Table is empty}\n");
 316
 317         banner_printed = 0;
 318
 319         /*
 320          * TODO:
 321          * The MFC table will move into the AF_INET radix trie in future.
 322          * In 8.x, it becomes a dynamically allocated structure referenced
 323          * by a hashed LIST, allowing more than 256 entries w/o kernel tuning.
 324          *
 325          * If retrieved via opaque SYSCTL, the kernel will coalesce it into
 326          * a static table for us.
 327          * If retrieved via KVM, the hash list pointers must be followed.
 328          */
 329         if (live) {
 330                 struct mfc *mfctable;
 331
 332                 len = 0;
 333                 if (sysctlbyname("net.inet.ip.mfctable", NULL, &len, NULL,
 334                     0) < 0) {
 335                         xo_warn("sysctl: net.inet.ip.mfctable");
 336                         return;
 337                 }
 338
 339                 mfctable = malloc(len);
 340                 if (mfctable == NULL) {
 341                         xo_warnx("malloc %lu bytes", (u_long)len);
 342                         return;
 343                 }
 344                 if (sysctlbyname("net.inet.ip.mfctable", mfctable, &len, NULL,
 345                     0) < 0) {
 346                         free(mfctable);
 347                         xo_warn("sysctl: net.inet.ip.mfctable");
 348                         return;
 349                 }
 350
 351                 m = mfctable;
 352                 while (len >= sizeof(*m)) {
 353                         print_mfc(m++, maxvif, &banner_printed);
 354                         len -= sizeof(*m);
 355                 }
 356                 if (banner_printed)
 357                         xo_close_list("multicast-forwarding-entry");
 358                 if (len != 0)
 359                         xo_warnx("print_mfc: %lu trailing bytes", (u_long)len);
 360
 361                 free(mfctable);
 362         } else {
 363                 LIST_HEAD(, mfc) *mfchashtbl;
 364                 u_long i, mfctablesize;
 365                 struct mfc mfc;
 366                 int error;
 367
 368                 error = kread(pmfctablesize, (char *)&mfctablesize,
 369                     sizeof(u_long));
 370                 if (error) {
 371                         xo_warn("kread: mfctablesize");
 372                         return;
 373                 }
 374
 375                 len = sizeof(*mfchashtbl) * mfctablesize;
 376                 mfchashtbl = malloc(len);
 377                 if (mfchashtbl == NULL) {
 378                         xo_warnx("malloc %lu bytes", (u_long)len);
 379                         return;
 380                 }
 381                 kread(pmfchashtbl, (char *)&mfchashtbl, len);
 382
 383                 for (i = 0; i < mfctablesize; i++) {
 384                         LIST_FOREACH(m, &mfchashtbl[i], mfc_hash) {
 385                                 kread((u_long)m, (char *)&mfc, sizeof(mfc));
 386                                 print_mfc(m, maxvif, &banner_printed);
 387                         }
 388                 }
 389                 if (banner_printed)
 390                         xo_close_list("multicast-forwarding-entry");
 391
 392                 free(mfchashtbl);
 393         }
 394
 395         if (!banner_printed)
 396                 xo_emit("\n{T:IPv4 Multicast Forwarding Table is empty}\n");
 397
 398         xo_emit("\n");
 399         numeric_addr = saved_numeric_addr;
 400 }
 401
 402 void
 403 mrt_stats()
 404 {
 405         struct mrtstat mrtstat;
 406         u_long mstaddr;
 407
 408         mstaddr = nl[N_MRTSTAT].n_value;
 409
 410         if (mstaddr == 0) {
 411                 fprintf(stderr, "No IPv4 MROUTING kernel support.\n");
 412                 return;
 413         }
 414
 415         if (fetch_stats("net.inet.ip.mrtstat", mstaddr, &mrtstat,
 416             sizeof(mrtstat), kread_counters) != 0)
 417                 return;
 418
 419         xo_emit("{T:IPv4 multicast forwarding}:\n");
 420
 421 #define p(f, m) if (mrtstat.f || sflag <= 1) \
 422         xo_emit(m, (uintmax_t)mrtstat.f, plural(mrtstat.f))
 423 #define p2(f, m) if (mrtstat.f || sflag <= 1) \
 424         xo_emit(m, (uintmax_t)mrtstat.f, plurales(mrtstat.f))
 425
 426         xo_open_container("multicast-statistics");
 427
 428         p(mrts_mfc_lookups, "\t{:cache-lookups/%ju} "
 429             "{N:/multicast forwarding cache lookup%s}\n");
 430         p2(mrts_mfc_misses, "\t{:cache-misses/%ju} "
 431             "{N:/multicast forwarding cache miss%s}\n");
 432         p(mrts_upcalls, "\t{:upcalls-total/%ju} "
 433             "{N:/upcall%s to multicast routing daemon}\n");
 434         p(mrts_upq_ovflw, "\t{:upcall-overflows/%ju} "
 435             "{N:/upcall queue overflow%s}\n");
 436         p(mrts_upq_sockfull,
 437             "\t{:upcalls-dropped-full-buffer/%ju} "
 438             "{N:/upcall%s dropped due to full socket buffer}\n");
 439         p(mrts_cache_cleanups, "\t{:cache-cleanups/%ju} "
 440             "{N:/cache cleanup%s}\n");
 441         p(mrts_no_route, "\t{:dropped-no-origin/%ju} "
 442             "{N:/datagram%s with no route for origin}\n");
 443         p(mrts_bad_tunnel, "\t{:dropped-bad-tunnel/%ju} "
 444             "{N:/datagram%s arrived with bad tunneling}\n");
 445         p(mrts_cant_tunnel, "\t{:dropped-could-not-tunnel/%ju} "
 446             "{N:/datagram%s could not be tunneled}\n");
 447         p(mrts_wrong_if, "\t{:dropped-wrong-incoming-interface/%ju} "
 448             "{N:/datagram%s arrived on wrong interface}\n");
 449         p(mrts_drop_sel, "\t{:dropped-selectively/%ju} "
 450             "{N:/datagram%s selectively dropped}\n");
 451         p(mrts_q_overflow, "\t{:dropped-queue-overflow/%ju} "
 452             "{N:/datagram%s dropped due to queue overflow}\n");
 453         p(mrts_pkt2large, "\t{:dropped-too-large/%ju} "
 454             "{N:/datagram%s dropped for being too large}\n");
 455
 456 #undef  p2
 457 #undef  p
 458 }