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 } 335