usr.bin/netstat/route.c

   1 /*      $NetBSD: route.c,v 1.84 2015/05/25 03:56:20 manu Exp $  */
   2
   3 /*
   4  * Copyright (c) 1983, 1988, 1993
   5  *      The Regents of the University of California.  All rights reserved.
   6  *
   7  * Redistribution and use in source and binary forms, with or without
   8  * modification, are permitted provided that the following conditions
   9  * are met:
  10  * 1. Redistributions of source code must retain the above copyright
  11  *    notice, this list of conditions and the following disclaimer.
  12  * 2. Redistributions in binary form must reproduce the above copyright
  13  *    notice, this list of conditions and the following disclaimer in the
  14  *    documentation and/or other materials provided with the distribution.
  15  * 3. Neither the name of the University nor the names of its contributors
  16  *    may be used to endorse or promote products derived from this software
  17  *    without specific prior written permission.
  18  *
  19  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  20  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  21  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  22  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  23  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  24  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  25  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  26  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  27  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  28  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  29  * SUCH DAMAGE.
  30  */
  31
  32 #include <sys/cdefs.h>
  33 #ifndef lint
  34 #if 0
  35 static char sccsid[] = "from: @(#)route.c       8.3 (Berkeley) 3/9/94";
  36 #else
  37 __RCSID("$NetBSD: route.c,v 1.84 2015/05/25 03:56:20 manu Exp $");
  38 #endif
  39 #endif /* not lint */
  40
  41 #include <stdbool.h>
  42 #include <sys/param.h>
  43 #include <sys/protosw.h>
  44 #include <sys/socket.h>
  45 #include <sys/mbuf.h>
  46 #include <sys/un.h>
  47
  48 #include <net/if.h>
  49 #include <net/if_dl.h>
  50 #include <net/if_types.h>
  51 #include <net/route.h>
  52 #include <netinet/in.h>
  53 #include <netatalk/at.h>
  54 #include <netmpls/mpls.h>
  55
  56 #include <sys/sysctl.h>
  57
  58 #include <arpa/inet.h>
  59
  60 #include <err.h>
  61 #include <kvm.h>
  62 #include <netdb.h>
  63 #include <stdio.h>
  64 #include <stdlib.h>
  65 #include <string.h>
  66 #include <unistd.h>
  67
  68 #include "netstat.h"
  69 #include "rtutil.h"
  70
  71 #define kget(p, d) (kread((u_long)(p), (char *)&(d), sizeof (d)))
  72
  73 /*
  74  * XXX we put all of the sockaddr types in here to force the alignment
  75  * to be correct.
  76  */
  77 static union sockaddr_union {
  78         struct  sockaddr u_sa;
  79         struct  sockaddr_in u_in;
  80         struct  sockaddr_un u_un;
  81         struct  sockaddr_at u_at;
  82         struct  sockaddr_dl u_dl;
  83         u_short u_data[128];
  84         int u_dummy;            /* force word-alignment */
  85 } pt_u;
  86
  87 int     do_rtent = 0;
  88 struct  rtentry rtentry;
  89 struct  radix_node rnode;
  90 struct  radix_mask rmask;
  91
  92 static struct sockaddr *kgetsa(const struct sockaddr *);
  93 static void p_tree(struct radix_node *);
  94 static void p_rtnode(void);
  95 static void p_krtentry(struct rtentry *);
  96
  97 /*
  98  * Print routing tables.
  99  */
 100 void
 101 routepr(u_long rtree)
 102 {
 103         struct radix_node_head *rnh, head;
 104         struct radix_node_head *rt_nodes[AF_MAX+1];
 105         int i;
 106
 107         printf("Routing tables\n");
 108
 109         if (rtree == 0) {
 110                 printf("rt_tables: symbol not in namelist\n");
 111                 return;
 112         }
 113
 114         kget(rtree, rt_nodes);
 115         for (i = 0; i <= AF_MAX; i++) {
 116                 if ((rnh = rt_nodes[i]) == 0)
 117                         continue;
 118                 kget(rnh, head);
 119                 if (i == AF_UNSPEC) {
 120                         if (Aflag && (af == 0 || af == 0xff)) {
 121                                 printf("Netmasks:\n");
 122                                 p_tree(head.rnh_treetop);
 123                         }
 124                 } else if (af == AF_UNSPEC || af == i) {
 125                         p_family(i);
 126                         do_rtent = 1;
 127                         p_rthdr(i, Aflag);
 128                         p_tree(head.rnh_treetop);
 129                 }
 130         }
 131 }
 132
 133 static struct sockaddr *
 134 kgetsa(const struct sockaddr *dst)
 135 {
 136
 137         kget(dst, pt_u.u_sa);
 138         if (pt_u.u_sa.sa_len > sizeof (pt_u.u_sa))
 139                 kread((u_long)dst, (char *)pt_u.u_data, pt_u.u_sa.sa_len);
 140         return (&pt_u.u_sa);
 141 }
 142
 143 static void
 144 p_tree(struct radix_node *rn)
 145 {
 146
 147 again:
 148         kget(rn, rnode);
 149         if (rnode.rn_b < 0) {
 150                 if (Aflag)
 151                         printf("%-8.8lx ", (u_long) rn);
 152                 if (rnode.rn_flags & RNF_ROOT) {
 153                         if (Aflag)
 154                                 printf("(root node)%s",
 155                                     rnode.rn_dupedkey ? " =>\n" : "\n");
 156                 } else if (do_rtent) {
 157                         kget(rn, rtentry);
 158                         p_krtentry(&rtentry);
 159                         if (Aflag)
 160                                 p_rtnode();
 161                 } else {
 162                         p_sockaddr(kgetsa((const struct sockaddr *)rnode.rn_key),
 163                             NULL, 0, 44, nflag);
 164                         putchar('\n');
 165                 }
 166                 if ((rn = rnode.rn_dupedkey) != NULL)
 167                         goto again;
 168         } else {
 169                 if (Aflag && do_rtent) {
 170                         printf("%-8.8lx ", (u_long) rn);
 171                         p_rtnode();
 172                 }
 173                 rn = rnode.rn_r;
 174                 p_tree(rnode.rn_l);
 175                 p_tree(rn);
 176         }
 177 }
 178
 179 static void
 180 p_rtnode(void)
 181 {
 182         struct radix_mask *rm = rnode.rn_mklist;
 183         char    nbuf[20];
 184
 185         if (rnode.rn_b < 0) {
 186                 if (rnode.rn_mask) {
 187                         printf("\t  mask ");
 188                         p_sockaddr(kgetsa((const struct sockaddr *)rnode.rn_mask),
 189                                     NULL, 0, -1, nflag);
 190                 } else if (rm == 0)
 191                         return;
 192         } else {
 193                 (void)snprintf(nbuf, sizeof nbuf, "(%d)", rnode.rn_b);
 194                 printf("%6.6s %8.8lx : %8.8lx", nbuf, (u_long) rnode.rn_l,
 195                     (u_long) rnode.rn_r);
 196         }
 197         while (rm) {
 198                 kget(rm, rmask);
 199                 (void)snprintf(nbuf, sizeof nbuf, " %d refs, ", rmask.rm_refs);
 200                 printf(" mk = %8.8lx {(%d),%s", (u_long) rm,
 201                     -1 - rmask.rm_b, rmask.rm_refs ? nbuf : " ");
 202                 if (rmask.rm_flags & RNF_NORMAL) {
 203                         struct radix_node rnode_aux;
 204                         printf(" <normal>, ");
 205                         kget(rmask.rm_leaf, rnode_aux);
 206                         p_sockaddr(kgetsa((const struct sockaddr *)rnode_aux.rn_mask),
 207                                     NULL, 0, -1, nflag);
 208                 } else
 209                         p_sockaddr(kgetsa((const struct sockaddr *)rmask.rm_mask),
 210                             NULL, 0, -1, nflag);
 211                 putchar('}');
 212                 if ((rm = rmask.rm_mklist) != NULL)
 213                         printf(" ->");
 214         }
 215         putchar('\n');
 216 }
 217
 218 static struct sockaddr *sockcopy(struct sockaddr *, union sockaddr_union *);
 219
 220 /*
 221  * copy a sockaddr into an allocated region, allocate at least sockaddr
 222  * bytes and zero unused
 223  */
 224 static struct sockaddr *
 225 sockcopy(struct sockaddr *sp, union sockaddr_union *dp)
 226 {
 227         int len;
 228
 229         if (sp == 0 || sp->sa_len == 0)
 230                 (void)memset(dp, 0, sizeof (*sp));
 231         else {
 232                 len = (sp->sa_len >= sizeof (*sp)) ? sp->sa_len : sizeof (*sp);
 233                 (void)memcpy(dp, sp, len);
 234         }
 235         return ((struct sockaddr *)dp);
 236 }
 237
 238 static void
 239 p_krtentry(struct rtentry *rt)
 240 {
 241         static struct ifnet ifnet, *lastif;
 242         union sockaddr_union addr_un, mask_un;
 243         struct sockaddr *addr, *mask;
 244
 245         if (Lflag && (rt->rt_flags & RTF_LLINFO))
 246                 return;
 247
 248         memset(&addr_un, 0, sizeof(addr_un));
 249         memset(&mask_un, 0, sizeof(mask_un));
 250         addr = sockcopy(kgetsa(rt_getkey(rt)), &addr_un);
 251         if (rt_mask(rt))
 252                 mask = sockcopy(kgetsa(rt_mask(rt)), &mask_un);
 253         else
 254                 mask = sockcopy(NULL, &mask_un);
 255         p_addr(addr, mask, rt->rt_flags, nflag);
 256         p_gwaddr(kgetsa(rt->rt_gateway), kgetsa(rt->rt_gateway)->sa_family, nflag);
 257         p_flags(rt->rt_flags);
 258         printf("%6d %8"PRIu64" ", rt->rt_refcnt, rt->rt_use);
 259         if (rt->rt_rmx.rmx_mtu)
 260                 printf("%6"PRIu64, rt->rt_rmx.rmx_mtu);
 261         else
 262                 printf("%6s", "-");
 263         putchar((rt->rt_rmx.rmx_locks & RTV_MTU) ? 'L' : ' ');
 264         if (tagflag == 1) {
 265 #ifndef SMALL
 266                 if (rt->rt_tag != NULL) {
 267                         const struct sockaddr *tagsa = kgetsa(rt->rt_tag);
 268                         char *tagstr;
 269
 270                         if (tagsa->sa_family == AF_MPLS) {
 271                                 tagstr = mpls_ntoa(tagsa);
 272                                 if (strlen(tagstr) < 7)
 273                                         printf("%7s", tagstr);
 274                                 else
 275                                         printf("%s", tagstr);
 276                         }
 277                         else
 278                                 printf("%7s", "-");
 279                 } else
 280 #endif
 281                         printf("%7s", "-");
 282         }
 283         if (rt->rt_ifp) {
 284                 if (rt->rt_ifp != lastif) {
 285                         kget(rt->rt_ifp, ifnet);
 286                         lastif = rt->rt_ifp;
 287                 }
 288                 printf(" %.16s%s", ifnet.if_xname,
 289                         rt->rt_nodes[0].rn_dupedkey ? " =>" : "");
 290         }
 291         putchar('\n');
 292 #ifndef SMALL
 293         if (vflag)
 294                 p_rtrmx(&rt->rt_rmx);
 295 #endif
 296 }
 297
 298 /*
 299  * Print routing statistics
 300  */
 301 void
 302 rt_stats(u_long off)
 303 {
 304         struct rtstat rtstats;
 305
 306         if (use_sysctl) {
 307                 size_t rtsize = sizeof(rtstats);
 308
 309                 if (sysctlbyname("net.route.stats", &rtstats, &rtsize,
 310                     NULL, 0) == -1)
 311                         err(1, "rt_stats: sysctl");
 312         } else  if (off == 0) {
 313                 printf("rtstat: symbol not in namelist\n");
 314                 return;
 315         } else
 316                 kread(off, (char *)&rtstats, sizeof(rtstats));
 317
 318         printf("routing:\n");
 319         printf("\t%llu bad routing redirect%s\n",
 320                 (unsigned long long)rtstats.rts_badredirect,
 321                 plural(rtstats.rts_badredirect));
 322         printf("\t%llu dynamically created route%s\n",
 323                 (unsigned long long)rtstats.rts_dynamic,
 324                 plural(rtstats.rts_dynamic));
 325         printf("\t%llu new gateway%s due to redirects\n",
 326                 (unsigned long long)rtstats.rts_newgateway,
 327                 plural(rtstats.rts_newgateway));
 328         printf("\t%llu destination%s found unreachable\n",
 329                 (unsigned long long)rtstats.rts_unreach,
 330                 plural(rtstats.rts_unreach));
 331         printf("\t%llu use%s of a wildcard route\n",
 332                 (unsigned long long)rtstats.rts_wildcard,
 333                 plural(rtstats.rts_wildcard));
 334 }