sbin/route/rtutil.c

   1 /*      $NetBSD: rtutil.c,v 1.6 2015/03/23 18:33:17 roy Exp $   */
   2 /*      $OpenBSD: show.c,v 1.1 2006/05/27 19:16:37 claudio Exp $        */
   3
   4 /*
   5  * Copyright (c) 1983, 1988, 1993
   6  *      The Regents of the University of California.  All rights reserved.
   7  *
   8  * Redistribution and use in source and binary forms, with or without
   9  * modification, are permitted provided that the following conditions
  10  * are met:
  11  * 1. Redistributions of source code must retain the above copyright
  12  *    notice, this list of conditions and the following disclaimer.
  13  * 2. Redistributions in binary form must reproduce the above copyright
  14  *    notice, this list of conditions and the following disclaimer in the
  15  *    documentation and/or other materials provided with the distribution.
  16  * 3. Neither the name of the University nor the names of its contributors
  17  *    may be used to endorse or promote products derived from this software
  18  *    without specific prior written permission.
  19  *
  20  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  21  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  22  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  23  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  24  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  25  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  26  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  27  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  28  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  29  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  30  * SUCH DAMAGE.
  31  */
  32
  33 #include <sys/param.h>
  34 #include <sys/protosw.h>
  35 #include <sys/socket.h>
  36 #include <sys/mbuf.h>
  37 #include <sys/sysctl.h>
  38
  39 #include <net/if.h>
  40 #include <net/if_dl.h>
  41 #include <net/if_types.h>
  42 #include <net/pfvar.h>
  43 #include <net/pfkeyv2.h>
  44 #include <net/route.h>
  45 #include <netinet/in.h>
  46 #include <netinet/if_ether.h>
  47 #include <netatalk/at.h>
  48 #include <netmpls/mpls.h>
  49 #include <arpa/inet.h>
  50
  51 #include <err.h>
  52 #include <errno.h>
  53 #include <netdb.h>
  54 #include <stdio.h>
  55 #include <stddef.h>
  56 #include <stdlib.h>
  57 #include <string.h>
  58 #include <unistd.h>
  59
  60 #include "prog_ops.h"
  61 #include "rtutil.h"
  62
  63
  64 #define PLEN    (LONG_BIT / 4 + 2)
  65 #define PFKEYV2_CHUNK sizeof(u_int64_t)
  66 static char *link_print(const struct sockaddr *);
  67
  68 /*
  69  * Definitions for showing gateway flags.
  70  */
  71 struct bits {
  72         int     b_mask;
  73         char    b_val;
  74 };
  75 static const struct bits bits[] = {
  76         { RTF_UP,       'U' },
  77         { RTF_GATEWAY,  'G' },
  78         { RTF_HOST,     'H' },
  79         { RTF_REJECT,   'R' },
  80         { RTF_BLACKHOLE, 'B' },
  81         { RTF_DYNAMIC,  'D' },
  82         { RTF_MODIFIED, 'M' },
  83         { RTF_DONE,     'd' }, /* Completed -- for routing messages only */
  84         { RTF_MASK,     'm' }, /* Mask Present -- for routing messages only */
  85         { RTF_CLONING,  'C' },
  86         { RTF_XRESOLVE, 'X' },
  87         { RTF_LLINFO,   'L' },
  88         { RTF_STATIC,   'S' },
  89         { RTF_PROTO1,   '1' },
  90         { RTF_PROTO2,   '2' },
  91         /* { RTF_PROTO3,        '3' }, */
  92         { RTF_CLONED,   'c' },
  93         /* { RTF_JUMBO, 'J' }, */
  94         { RTF_ANNOUNCE, 'p' },
  95         { RTF_LOCAL, 'l'},
  96         { RTF_BROADCAST, 'b'},
  97         { 0, 0 }
  98 };
  99
 100 #ifndef SMALL
 101 static void p_tag(const struct sockaddr *sa);
 102 #endif
 103 static void p_rtentry(struct rt_msghdr *, int, int);
 104
 105 /*
 106  * Print routing tables.
 107  */
 108 void
 109 p_rttables(int paf, int flags, int pflags, int interesting)
 110 {
 111         struct rt_msghdr *rtm;
 112         char *buf = NULL, *next, *lim = NULL;
 113         size_t needed;
 114         int mib[6];
 115         struct sockaddr *sa;
 116
 117         mib[0] = CTL_NET;
 118         mib[1] = PF_ROUTE;
 119         mib[2] = 0;
 120         mib[3] = paf;
 121         mib[4] = NET_RT_DUMP;
 122         mib[5] = 0;
 123         if (prog_sysctl(mib, 6, NULL, &needed, NULL, 0) < 0)
 124                 err(1, "route-sysctl-estimate");
 125         if (needed > 0) {
 126                 if ((buf = malloc(needed)) == 0)
 127                         err(1, NULL);
 128                 if (prog_sysctl(mib, 6, buf, &needed, NULL, 0) < 0)
 129                         err(1, "sysctl of routing table");
 130                 lim = buf + needed;
 131         }
 132
 133         printf("Routing tables\n");
 134
 135         if (buf) {
 136                 for (next = buf; next < lim; next += rtm->rtm_msglen) {
 137                         rtm = (struct rt_msghdr *)next;
 138                         sa = (struct sockaddr *)(rtm + 1);
 139                         if ((rtm->rtm_flags & pflags) != pflags)
 140                                 continue;
 141                         if (paf != AF_UNSPEC && sa->sa_family != paf)
 142                                 continue;
 143                         p_rtentry(rtm, flags, interesting);
 144                 }
 145                 free(buf);
 146                 buf = NULL;
 147         }
 148
 149         if (paf != 0 && paf != PF_KEY)
 150                 return;
 151
 152 #if 0 /* XXX-elad */
 153         mib[0] = CTL_NET;
 154         mib[1] = PF_KEY;
 155         mib[2] = PF_KEY_V2;
 156         mib[3] = NET_KEY_SPD_DUMP;
 157         mib[4] = mib[5] = 0;
 158
 159         if (prog_sysctl(mib, 4, NULL, &needed, NULL, 0) == -1) {
 160                 if (errno == ENOPROTOOPT)
 161                         return;
 162                 err(1, "spd-sysctl-estimate");
 163         }
 164         if (needed > 0) {
 165                 if ((buf = malloc(needed)) == 0)
 166                         err(1, NULL);
 167                 if (prog_sysctl(mib, 4, buf, &needed, NULL, 0) == -1)
 168                         err(1,"sysctl of spd");
 169                 lim = buf + needed;
 170         }
 171
 172         if (buf) {
 173                 printf("\nEncap:\n");
 174
 175                 for (next = buf; next < lim; next += msg->sadb_msg_len *
 176                     PFKEYV2_CHUNK) {
 177                         msg = (struct sadb_msg *)next;
 178                         if (msg->sadb_msg_len == 0)
 179                                 break;
 180                         p_pfkentry(msg);
 181                 }
 182                 free(buf);
 183                 buf = NULL;
 184         }
 185 #endif /* 0 */
 186 }
 187
 188 /*
 189  * column widths; each followed by one space
 190  * width of destination/gateway column
 191  * strlen("fe80::aaaa:bbbb:cccc:dddd@gif0") == 30, strlen("/128") == 4 = 34
 192  * strlen("aaaa:bbbb:cccc:dddd:eeee:ffff:gggg:hhhh") == 39
 193  */
 194 #ifndef INET6
 195 #define WID_DST(af)     18      /* width of destination column */
 196 #define WID_GW(af)      18      /* width of gateway column */
 197 #else
 198 #define WID_DST(af)     ((af) == AF_INET6 ? ((flags & RT_NFLAG) ? 39 : 18) : 18)
 199 #define WID_GW(af)      ((af) == AF_INET6 ? ((flags & RT_NFLAG) ? 30 : 18) : 18)
 200 #endif
 201
 202 /*
 203  * Print header for routing table columns.
 204  */
 205 void
 206 p_rthdr(int paf, int flags)
 207 {
 208 #ifndef SMALL
 209         if (flags & RT_AFLAG)
 210                 printf("%-*.*s ", PLEN, PLEN, "Address");
 211         if (paf == PF_KEY) {
 212                 printf("%-18s %-5s %-18s %-5s %-5s %-22s\n",
 213                     "Source", "Port", "Destination",
 214                     "Port", "Proto", "SA(Address/Proto/Type/Direction)");
 215                 return;
 216         }
 217         if (flags & RT_TFLAG) {
 218             printf("%-*.*s %-*.*s %-6.6s %6.6s %8.8s %6.6s %7.7s"
 219                 " %s\n", WID_DST(paf), WID_DST(paf), "Destination",
 220                 WID_GW(paf), WID_GW(paf), "Gateway",
 221                 "Flags", "Refs", "Use", "Mtu", "Tag", "Interface");
 222             return;
 223         }
 224 #endif
 225 #ifndef SMALL
 226         printf("%-*.*s %-*.*s %-6.6s %6.6s %8.8s %6.6s %s\n",
 227             WID_DST(paf), WID_DST(paf), "Destination",
 228             WID_GW(paf), WID_GW(paf), "Gateway",
 229             "Flags", "Refs", "Use", "Mtu", "Interface");
 230 #else
 231         printf("%-*.*s %-*.*s %-6.6s\n",
 232             WID_DST(paf), WID_DST(paf), "Destination",
 233             WID_GW(paf), WID_GW(paf), "Gateway",
 234             "Flags");
 235 #endif
 236 }
 237
 238 static void
 239 get_rtaddrs(int addrs, struct sockaddr *sa, struct sockaddr **rti_info)
 240 {
 241         int     i;
 242
 243         for (i = 0; i < RTAX_MAX; i++) {
 244                 if (addrs & (1 << i)) {
 245                         rti_info[i] = sa;
 246                         sa = (struct sockaddr *)((char *)(sa) +
 247                             RT_ROUNDUP(sa->sa_len));
 248                 } else
 249                         rti_info[i] = NULL;
 250         }
 251 }
 252
 253 /*
 254  * Print a routing table entry.
 255  */
 256 static void
 257 p_rtentry(struct rt_msghdr *rtm, int flags, int interesting)
 258 {
 259         static int       old_af = -1;
 260         struct sockaddr *sa = (struct sockaddr *)(rtm + 1);
 261         struct sockaddr *mask, *rti_info[RTAX_MAX];
 262 #ifndef SMALL
 263         char             ifbuf[IF_NAMESIZE];
 264 #endif
 265
 266         if ((flags & RT_LFLAG) && (rtm->rtm_flags & RTF_LLINFO))
 267                 return;
 268
 269         if (old_af != sa->sa_family) {
 270                 old_af = sa->sa_family;
 271                 p_family(sa->sa_family);
 272                 p_rthdr(sa->sa_family, flags);
 273         }
 274         get_rtaddrs(rtm->rtm_addrs, sa, rti_info);
 275
 276         mask = rti_info[RTAX_NETMASK];
 277         if ((sa = rti_info[RTAX_DST]) == NULL)
 278                 return;
 279
 280         p_sockaddr(sa, mask, rtm->rtm_flags, WID_DST(sa->sa_family), flags);
 281         p_sockaddr(rti_info[RTAX_GATEWAY], NULL, RTF_HOST,
 282             WID_GW(sa->sa_family), flags);
 283         p_flags(rtm->rtm_flags & interesting);
 284 #if 0 /* XXX-elad */
 285         printf("%6d %8"PRId64" ", (int)rtm->rtm_rmx.rmx_refcnt,
 286             rtm->rtm_rmx.rmx_pksent);
 287 #else
 288         printf("%6s %8s ", "-", "-");
 289 #endif
 290 #ifndef SMALL
 291         if (rtm->rtm_rmx.rmx_mtu)
 292                 printf("%6"PRId64, rtm->rtm_rmx.rmx_mtu);
 293         else
 294                 printf("%6s", "-");
 295         putchar((rtm->rtm_rmx.rmx_locks & RTV_MTU) ? 'L' : ' ');
 296         if (flags & RT_TFLAG)
 297                 p_tag(rti_info[RTAX_TAG]);
 298         printf(" %.16s", if_indextoname(rtm->rtm_index, ifbuf));
 299         putchar('\n');
 300         if (flags & RT_VFLAG)
 301                 p_rtrmx(&rtm->rtm_rmx);
 302 #endif
 303 }
 304
 305 /*
 306  * Print address family header before a section of the routing table.
 307  */
 308 void
 309 p_family(int paf)
 310 {
 311         const char *afname;
 312
 313         switch (paf) {
 314         case AF_INET:
 315                 afname = "Internet";
 316                 break;
 317 #ifdef INET6
 318         case AF_INET6:
 319                 afname = "Internet6";
 320                 break;
 321 #endif
 322         case PF_KEY:
 323                 afname = "Encap";
 324                 break;
 325         case AF_APPLETALK:
 326                 afname = "AppleTalk";
 327                 break;
 328 #ifndef SMALL
 329         case AF_MPLS:
 330                 afname = "MPLS";
 331                 break;
 332 #endif
 333         default:
 334                 afname = NULL;
 335                 break;
 336         }
 337         if (afname)
 338                 printf("\n%s:\n", afname);
 339         else
 340                 printf("\nProtocol Family %d:\n", paf);
 341 }
 342
 343 void
 344 p_sockaddr(const struct sockaddr *sa, const struct sockaddr *mask, int rflags,
 345     int width, int flags)
 346 {
 347         char *cp;
 348
 349         switch (sa->sa_family) {
 350 #ifdef INET6
 351         case AF_INET6:
 352             {
 353                 struct sockaddr_in6 sa6 = *(const struct sockaddr_in6 *)sa;
 354
 355                 inet6_getscopeid(&sa6, INET6_IS_ADDR_LINKLOCAL|
 356                     INET6_IS_ADDR_MC_LINKLOCAL);
 357                 if (rflags & RTF_HOST)
 358                         cp = routename((const struct sockaddr *)&sa6, flags);
 359                 else
 360                         cp = netname((const struct sockaddr *)&sa6, mask, flags);
 361                 break;
 362             }
 363 #endif
 364         default:
 365                 if ((rflags & RTF_HOST) || mask == NULL)
 366                         cp = routename(sa, flags);
 367                 else
 368                         cp = netname(sa, mask, flags);
 369                 break;
 370         }
 371         if (width < 0)
 372                 printf("%s", cp);
 373         else {
 374                 if (flags & RT_NFLAG)
 375                         printf("%-*s ", width, cp);
 376                 else
 377                         printf("%-*.*s ", width, width, cp);
 378         }
 379 }
 380
 381 void
 382 p_flags(int f)
 383 {
 384         char name[33], *flags;
 385         const struct bits *p = bits;
 386
 387         for (flags = name; p->b_mask && flags < &name[sizeof(name) - 2]; p++)
 388                 if (p->b_mask & f)
 389                         *flags++ = p->b_val;
 390         *flags = '\0';
 391         printf("%-6.6s ", name);
 392 }
 393
 394 #ifndef SMALL
 395 void
 396 p_rtrmx(const struct rt_metrics *rmx)
 397 {
 398         printf("\texpire   %10"PRId64"%c  recvpipe %10"PRIu64"%c  "
 399             "sendpipe %10"PRIu64"%c\n",
 400             (int64_t)rmx->rmx_expire,
 401             (rmx->rmx_locks & RTV_EXPIRE) ? 'L' : ' ', rmx->rmx_recvpipe,
 402             (rmx->rmx_locks & RTV_RPIPE) ? 'L' : ' ', rmx->rmx_sendpipe,
 403             (rmx->rmx_locks & RTV_SPIPE) ? 'L' : ' ');
 404         printf("\tssthresh %10"PRIu64"%c  rtt      %10"PRIu64"%c  "
 405             "rttvar   %10"PRIu64"%c\n", rmx->rmx_ssthresh,
 406             (rmx->rmx_locks & RTV_SSTHRESH) ? 'L' : ' ',
 407             rmx->rmx_rtt, (rmx->rmx_locks & RTV_RTT) ? 'L' : ' ',
 408             rmx->rmx_rttvar, (rmx->rmx_locks & RTV_RTTVAR) ? 'L' : ' ');
 409         printf("\thopcount %10"PRIu64"%c\n",
 410             rmx->rmx_hopcount, (rmx->rmx_locks & RTV_HOPCOUNT) ? 'L' : ' ');
 411 }
 412
 413 static void
 414 p_tag(const struct sockaddr *sa)
 415 {
 416         char *line;
 417
 418         if (sa == NULL || sa->sa_family != AF_MPLS) {
 419                 printf("%7s", "-");
 420                 return;
 421         }
 422         line = mpls_ntoa(sa);
 423         if (strlen(line) < 7)
 424                 printf("%7s", line);
 425         else
 426                 printf("%s", line);
 427 }
 428 #endif
 429
 430 static char line[MAXHOSTNAMELEN];
 431 static char domain[MAXHOSTNAMELEN];
 432
 433 char *
 434 routename(const struct sockaddr *sa, int flags)
 435 {
 436         char *cp = NULL;
 437         static int first = 1;
 438
 439         if (first) {
 440                 first = 0;
 441                 if (gethostname(domain, sizeof(domain)) == 0 &&
 442                     (cp = strchr(domain, '.')))
 443                         (void)strlcpy(domain, cp + 1, sizeof(domain));
 444                 else
 445                         domain[0] = '\0';
 446                 cp = NULL;
 447         }
 448
 449         if (sa->sa_len == 0) {
 450                 (void)strlcpy(line, "default", sizeof(line));
 451                 return (line);
 452         }
 453
 454         switch (sa->sa_family) {
 455         case AF_INET:
 456                 return routename4(
 457                     ((const struct sockaddr_in *)sa)->sin_addr.s_addr,
 458                     flags);
 459 #ifdef INET6
 460         case AF_INET6:
 461             {
 462                 struct sockaddr_in6 sin6;
 463
 464                 memset(&sin6, 0, sizeof(sin6));
 465                 memcpy(&sin6, sa, sa->sa_len);
 466                 sin6.sin6_len = sizeof(struct sockaddr_in6);
 467                 sin6.sin6_family = AF_INET6;
 468                 if (sa->sa_len == sizeof(struct sockaddr_in6))
 469 #if defined(__minix)
 470                     /*
 471                      * Local MINIX3 fix for a NetBSD issue: inet6_getscopeid()
 472                      * is sometimes called twice in a row when printing routing
 473                      * tables, discarding the scope ID the second time..
 474                      */
 475                     if (sin6.sin6_scope_id == 0)
 476 #endif /* defined(__minix) */
 477                         inet6_getscopeid(&sin6, INET6_IS_ADDR_LINKLOCAL|
 478                             INET6_IS_ADDR_MC_LINKLOCAL);
 479                 return routename6(&sin6, flags);
 480             }
 481 #endif
 482         case AF_LINK:
 483                 return link_print(sa);
 484
 485 #ifndef SMALL
 486         case AF_MPLS:
 487                 return mpls_ntoa(sa);
 488
 489         case AF_APPLETALK:
 490                 (void)snprintf(line, sizeof(line), "atalk %d.%d",
 491                     ((const struct sockaddr_at *)sa)->sat_addr.s_net,
 492                     ((const struct sockaddr_at *)sa)->sat_addr.s_node);
 493                 break;
 494 #endif
 495
 496 #if 0 /* XXX-elad */
 497         case AF_UNSPEC:
 498                 if (sa->sa_len == sizeof(struct sockaddr_rtlabel)) {
 499                         static char name[RTLABEL_LEN];
 500                         struct sockaddr_rtlabel *sr;
 501
 502                         sr = (struct sockaddr_rtlabel *)sa;
 503                         strlcpy(name, sr->sr_label, sizeof(name));
 504                         return (name);
 505                 }
 506                 /* FALLTHROUGH */
 507 #endif
 508         default:
 509                 (void)snprintf(line, sizeof(line), "(%d) %s",
 510                     sa->sa_family, any_ntoa(sa));
 511                 break;
 512         }
 513         return (line);
 514 }
 515
 516 char *
 517 routename4(in_addr_t in, int flags)
 518 {
 519         const char      *cp = NULL;
 520         struct in_addr   ina;
 521         struct hostent  *hp;
 522
 523         if (in == INADDR_ANY)
 524                 cp = "default";
 525         if (!cp && (flags & RT_NFLAG) == 0) {
 526                 if ((hp = gethostbyaddr((char *)&in,
 527                     sizeof(in), AF_INET)) != NULL) {
 528                         char *p;
 529                         if ((p = strchr(hp->h_name, '.')) &&
 530                             !strcmp(p + 1, domain))
 531                                 *p = '\0';
 532                         cp = hp->h_name;
 533                 }
 534         }
 535         ina.s_addr = in;
 536         strlcpy(line, cp ? cp : inet_ntoa(ina), sizeof(line));
 537
 538         return (line);
 539 }
 540
 541 #ifdef INET6
 542 char *
 543 routename6(const struct sockaddr_in6 *sin6, int flags)
 544 {
 545         int      niflags = 0;
 546
 547         if ((flags & RT_NFLAG))
 548                 niflags |= NI_NUMERICHOST;
 549         else
 550                 niflags |= NI_NOFQDN;
 551
 552         if (getnameinfo((const struct sockaddr *)sin6, sin6->sin6_len,
 553             line, sizeof(line), NULL, 0, niflags) != 0)
 554                 strncpy(line, "invalid", sizeof(line));
 555
 556         return (line);
 557 }
 558 #endif
 559
 560 /*
 561  * Return the name of the network whose address is given.
 562  * The address is assumed to be that of a net or subnet, not a host.
 563  */
 564 char *
 565 netname4(const struct sockaddr_in* sa4, const struct sockaddr_in *mask, int flags)
 566 {
 567         const char *cp = NULL;
 568         struct netent *np = NULL;
 569         int mbits;
 570         in_addr_t in = sa4->sin_addr.s_addr;
 571
 572         if (mask) {
 573                 in_addr_t m = mask->sin_addr.s_addr ;
 574                 m = ntohl(m);
 575                 mbits = m ? 33 - ffs(m) : 0;
 576         } else
 577                 mbits = 0;
 578
 579         in = ntohl(in);
 580         if (in == INADDR_ANY && !mbits)
 581                 cp = "default";
 582         else if (!(flags & RT_NFLAG) && in != INADDR_ANY) {
 583                 if ((np = getnetbyaddr(in, AF_INET)) != NULL)
 584                         cp = np->n_name;
 585         }
 586         if (cp)
 587                 strlcpy(line, cp, sizeof(line));
 588 #define C(x)    ((x) & 0xff)
 589         else if (mbits < 9)
 590                 snprintf(line, sizeof(line), "%u/%d", C(in >> 24), mbits);
 591         else if (mbits < 17)
 592                 snprintf(line, sizeof(line), "%u.%u/%d",
 593                     C(in >> 24) , C(in >> 16), mbits);
 594         else if (mbits < 25)
 595                 snprintf(line, sizeof(line), "%u.%u.%u/%d",
 596                     C(in >> 24), C(in >> 16), C(in >> 8), mbits);
 597         else
 598                 snprintf(line, sizeof(line), "%u.%u.%u.%u/%d", C(in >> 24),
 599                     C(in >> 16), C(in >> 8), C(in), mbits);
 600 #undef C
 601         return line;
 602 }
 603
 604 #ifdef INET6
 605 char *
 606 netname6(const struct sockaddr_in6 *sa6, const struct sockaddr_in6 *mask, int flags)
 607 {
 608         struct sockaddr_in6 sin6;
 609         const u_char *p;
 610         int masklen, final = 0, illegal = 0;
 611         int i, lim, flag, error;
 612         char hbuf[NI_MAXHOST];
 613
 614         sin6 = *sa6;
 615
 616         flag = 0;
 617         masklen = 0;
 618         if (mask) {
 619                 lim = mask->sin6_len - offsetof(struct sockaddr_in6, sin6_addr);
 620                 if (lim < 0)
 621                         lim = 0;
 622                 else if (lim > (int)sizeof(struct in6_addr))
 623                         lim = sizeof(struct in6_addr);
 624                 for (p = (const u_char *)&mask->sin6_addr, i = 0; i < lim; p++) {
 625                         if (final && *p) {
 626                                 illegal++;
 627                                 sin6.sin6_addr.s6_addr[i++] = 0x00;
 628                                 continue;
 629                         }
 630
 631                         switch (*p & 0xff) {
 632                         case 0xff:
 633                                 masklen += 8;
 634                                 break;
 635                         case 0xfe:
 636                                 masklen += 7;
 637                                 final++;
 638                                 break;
 639                         case 0xfc:
 640                                 masklen += 6;
 641                                 final++;
 642                                 break;
 643                         case 0xf8:
 644                                 masklen += 5;
 645                                 final++;
 646                                 break;
 647                         case 0xf0:
 648                                 masklen += 4;
 649                                 final++;
 650                                 break;
 651                         case 0xe0:
 652                                 masklen += 3;
 653                                 final++;
 654                                 break;
 655                         case 0xc0:
 656                                 masklen += 2;
 657                                 final++;
 658                                 break;
 659                         case 0x80:
 660                                 masklen += 1;
 661                                 final++;
 662                                 break;
 663                         case 0x00:
 664                                 final++;
 665                                 break;
 666                         default:
 667                                 final++;
 668                                 illegal++;
 669                                 break;
 670                         }
 671
 672                         if (!illegal)
 673                                 sin6.sin6_addr.s6_addr[i++] &= *p;
 674                         else
 675                                 sin6.sin6_addr.s6_addr[i++] = 0x00;
 676                 }
 677                 while (i < (int)sizeof(struct in6_addr))
 678                         sin6.sin6_addr.s6_addr[i++] = 0x00;
 679         } else
 680                 masklen = 128;
 681
 682         if (masklen == 0 && IN6_IS_ADDR_UNSPECIFIED(&sin6.sin6_addr)) {
 683                 snprintf(line, sizeof(line), "default");
 684                 return (line);
 685         }
 686
 687         if (illegal)
 688                 warnx("illegal prefixlen");
 689
 690         if (flags & RT_NFLAG)
 691                 flag |= NI_NUMERICHOST;
 692         error = getnameinfo((struct sockaddr *)&sin6, sin6.sin6_len,
 693             hbuf, sizeof(hbuf), NULL, 0, flag);
 694         if (error)
 695                 snprintf(hbuf, sizeof(hbuf), "invalid");
 696
 697         snprintf(line, sizeof(line), "%s/%d", hbuf, masklen);
 698         return (line);
 699 }
 700 #endif
 701
 702 /*
 703  * Return the name of the network whose address is given.
 704  * The address is assumed to be that of a net or subnet, not a host.
 705  */
 706 char *
 707 netname(const struct sockaddr *sa, const struct sockaddr *mask, int flags)
 708 {
 709         switch (sa->sa_family) {
 710
 711         case AF_INET:
 712                 return netname4((const struct sockaddr_in *)sa,
 713                     (const struct sockaddr_in *)mask, flags);
 714 #ifdef INET6
 715         case AF_INET6:
 716                 return netname6((const struct sockaddr_in6 *)sa,
 717                     (const struct sockaddr_in6 *)mask, flags);
 718 #endif
 719         case AF_LINK:
 720                 return link_print(sa);
 721         default:
 722                 snprintf(line, sizeof(line), "af %d: %s",
 723                     sa->sa_family, any_ntoa(sa));
 724                 break;
 725         }
 726         return (line);
 727 }
 728
 729 static const char hexlist[] = "0123456789abcdef";
 730
 731 char *
 732 any_ntoa(const struct sockaddr *sa)
 733 {
 734         static char obuf[240];
 735         const char *in = sa->sa_data;
 736         char *out = obuf;
 737         int len = sa->sa_len - offsetof(struct sockaddr, sa_data);
 738
 739         *out++ = 'Q';
 740         do {
 741                 *out++ = hexlist[(*in >> 4) & 15];
 742                 *out++ = hexlist[(*in++)    & 15];
 743                 *out++ = '.';
 744         } while (--len > 0 && (out + 3) < &obuf[sizeof(obuf) - 1]);
 745         out[-1] = '\0';
 746         return (obuf);
 747 }
 748
 749 static char *
 750 link_print(const struct sockaddr *sa)
 751 {
 752         const struct sockaddr_dl *sdl = (const struct sockaddr_dl *)sa;
 753         const u_char *lla = (const u_char *)sdl->sdl_data + sdl->sdl_nlen;
 754
 755         if (sdl->sdl_nlen == 0 && sdl->sdl_alen == 0 &&
 756             sdl->sdl_slen == 0) {
 757                 (void)snprintf(line, sizeof(line), "link#%d", sdl->sdl_index);
 758                 return (line);
 759         }
 760         switch (sdl->sdl_type) {
 761         case IFT_ETHER:
 762         case IFT_CARP:
 763                 return ether_ntoa((const struct ether_addr *)lla);
 764         default:
 765                 return link_ntoa(sdl);
 766         }
 767 }
 768
 769 #ifndef SMALL
 770 char *
 771 mpls_ntoa(const struct sockaddr *sa)
 772 {
 773         static char obuf[16];
 774         size_t olen;
 775         const union mpls_shim *pms;
 776         union mpls_shim ms;
 777         int psize = sizeof(struct sockaddr_mpls);
 778
 779         pms = &((const struct sockaddr_mpls*)sa)->smpls_addr;
 780         ms.s_addr = ntohl(pms->s_addr);
 781
 782         snprintf(obuf, sizeof(obuf), "%u", ms.shim.label);
 783
 784         while(psize < sa->sa_len) {
 785                 pms++;
 786                 ms.s_addr = ntohl(pms->s_addr);
 787                 olen = strlen(obuf);
 788                 snprintf(obuf + olen, sizeof(obuf) - olen, ",%u",
 789                     ms.shim.label);
 790                 psize+=sizeof(ms);
 791         }
 792         return obuf;
 793 }
 794 #endif
 795
 796 void
 797 p_addr(const struct sockaddr *sa, const struct sockaddr *mask, int rflags, int flags)
 798 {
 799         p_sockaddr(sa, mask, rflags, WID_DST(sa->sa_family), flags);
 800 }
 801
 802 void
 803 p_gwaddr(const struct sockaddr *sa, int gwaf, int flags)
 804 {
 805         p_sockaddr(sa, 0, RTF_HOST, WID_GW(gwaf), flags);
 806 }