1 /*- 2 * SPDX-License-Identifier: BSD-3-Clause 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 #include <sys/param.h> 34 #include <sys/protosw.h> 35 #include <sys/socket.h> 36 #include <sys/socketvar.h> 37 #include <sys/sysctl.h> 38 #include <sys/time.h> 39 40 #include <net/ethernet.h> 41 #include <net/if.h> 42 #include <net/if_dl.h> 43 #include <net/if_types.h> 44 #include <net/route.h> 45 #include <net/route/nhop.h> 46 47 #include <netinet/in.h> 48 #include <netgraph/ng_socket.h> 49 50 #include <arpa/inet.h> 51 #include <ifaddrs.h> 52 #include <libutil.h> 53 #include <netdb.h> 54 #include <stdbool.h> 55 #include <stdint.h> 56 #include <stdio.h> 57 #include <stdlib.h> 58 #include <stdbool.h> 59 #include <string.h> 60 #include <sysexits.h> 61 #include <unistd.h> 62 #include <err.h> 63 #include <libxo/xo.h> 64 #include "netstat.h" 65 #include "common.h" 66 67 /* column widths; each followed by one space */ 68 #ifndef INET6 69 #define WID_DST_DEFAULT(af) 18 /* width of destination column */ 70 #define WID_GW_DEFAULT(af) 18 /* width of gateway column */ 71 #define WID_IF_DEFAULT(af) (Wflag ? 10 : 8) /* width of netif column */ 72 #else 73 #define WID_DST_DEFAULT(af) \ 74 ((af) == AF_INET6 ? (numeric_addr ? 33: 18) : 18) 75 #define WID_GW_DEFAULT(af) \ 76 ((af) == AF_INET6 ? (numeric_addr ? 29 : 18) : 18) 77 #define WID_IF_DEFAULT(af) ((af) == AF_INET6 ? 8 : (Wflag ? 10 : 8)) 78 #endif /*INET6*/ 79 static int wid_dst; 80 static int wid_gw; 81 static int wid_flags; 82 static int wid_pksent; 83 static int wid_mtu; 84 static int wid_if; 85 static int wid_nhidx; 86 static int wid_nhtype; 87 static int wid_refcnt; 88 static int wid_prepend; 89 90 static struct bits nh_bits[] = { 91 { NHF_REJECT, 'R', "reject" }, 92 { NHF_BLACKHOLE,'B', "blackhole" }, 93 { NHF_REDIRECT, 'r', "redirect" }, 94 { NHF_GATEWAY, 'G', "gateway" }, 95 { NHF_DEFAULT, 'd', "default" }, 96 { NHF_BROADCAST,'b', "broadcast" }, 97 { 0 , 0, NULL } 98 }; 99 100 static char *nh_types[] = { 101 "empty", /* 0 */ 102 "v4/resolve", /* 1 */ 103 "v4/gw", 104 "v6/resolve", 105 "v6/gw" 106 }; 107 108 struct nhop_entry { 109 char gw[64]; 110 char ifname[IFNAMSIZ]; 111 }; 112 113 struct nhop_map { 114 struct nhop_entry *ptr; 115 size_t size; 116 }; 117 static struct nhop_map global_nhop_map; 118 119 static struct nhop_entry *nhop_get(struct nhop_map *map, uint32_t idx); 120 121 122 static struct ifmap_entry *ifmap; 123 static size_t ifmap_size; 124 125 static void 126 print_sockaddr_buf(char *buf, size_t bufsize, const struct sockaddr *sa) 127 { 128 129 switch (sa->sa_family) { 130 case AF_INET: 131 inet_ntop(AF_INET, &((struct sockaddr_in *)sa)->sin_addr, 132 buf, bufsize); 133 break; 134 case AF_INET6: 135 inet_ntop(AF_INET6, &((struct sockaddr_in6 *)sa)->sin6_addr, 136 buf, bufsize); 137 break; 138 default: 139 snprintf(buf, bufsize, "unknown:%d", sa->sa_family); 140 break; 141 } 142 } 143 144 static int 145 print_addr(const char *name, const char *addr, int width) 146 { 147 char buf[128]; 148 int protrusion; 149 150 if (width < 0) { 151 snprintf(buf, sizeof(buf), "{:%s/%%s} ", name); 152 xo_emit(buf, addr); 153 protrusion = 0; 154 } else { 155 if (Wflag != 0 || numeric_addr) { 156 snprintf(buf, sizeof(buf), "{[:%d}{:%s/%%s}{]:} ", 157 -width, name); 158 xo_emit(buf, addr); 159 protrusion = strlen(addr) - width; 160 if (protrusion < 0) 161 protrusion = 0; 162 } else { 163 snprintf(buf, sizeof(buf), "{[:%d}{:%s/%%-.*s}{]:} ", 164 -width, name); 165 xo_emit(buf, width, addr); 166 protrusion = 0; 167 } 168 } 169 return (protrusion); 170 } 171 172 173 static void 174 print_nhop_header(int af1 __unused) 175 { 176 177 if (Wflag) { 178 xo_emit("{T:/%-*.*s} {T:/%-*.*s} {T:/%-*.*s} {T:/%-*.*s} {T:/%*.*s} " 179 "{T:/%*.*s} {T:/%-*.*s} {T:/%*.*s} {T:/%*.*s} {T:/%*.*s} {T:/%*s}\n", 180 wid_nhidx, wid_nhidx, "Idx", 181 wid_nhtype, wid_nhtype, "Type", 182 wid_dst, wid_dst, "IFA", 183 wid_gw, wid_gw, "Gateway", 184 wid_flags, wid_flags, "Flags", 185 wid_pksent, wid_pksent, "Use", 186 wid_mtu, wid_mtu, "Mtu", 187 wid_if, wid_if, "Netif", 188 wid_if, wid_if, "Addrif", 189 wid_refcnt, wid_refcnt, "Refcnt", 190 wid_prepend, "Prepend"); 191 } else { 192 xo_emit("{T:/%-*.*s} {T:/%-*.*s} {T:/%-*.*s} {T:/%-*.*s} {T:/%*.*s} " 193 " {T:/%*s}\n", 194 wid_nhidx, wid_nhidx, "Idx", 195 wid_dst, wid_dst, "IFA", 196 wid_gw, wid_gw, "Gateway", 197 wid_flags, wid_flags, "Flags", 198 wid_if, wid_if, "Netif", 199 wid_prepend, "Refcnt"); 200 } 201 } 202 203 void 204 nhop_map_update(struct nhop_map *map, uint32_t idx, char *gw, char *ifname) 205 { 206 if (idx >= map->size) { 207 uint32_t new_size; 208 size_t sz; 209 if (map->size == 0) 210 new_size = 32; 211 else 212 new_size = map->size * 2; 213 if (new_size <= idx) 214 new_size = roundup2(idx + 1, 32); 215 216 sz = new_size * (sizeof(struct nhop_entry)); 217 if ((map->ptr = realloc(map->ptr, sz)) == NULL) 218 errx(2, "realloc(%zu) failed", sz); 219 220 memset(&map->ptr[map->size], 0, (new_size - map->size) * sizeof(struct nhop_entry)); 221 map->size = new_size; 222 } 223 224 strlcpy(map->ptr[idx].ifname, ifname, sizeof(map->ptr[idx].ifname)); 225 strlcpy(map->ptr[idx].gw, gw, sizeof(map->ptr[idx].gw)); 226 } 227 228 static struct nhop_entry * 229 nhop_get(struct nhop_map *map, uint32_t idx) 230 { 231 232 if (idx >= map->size) 233 return (NULL); 234 if (*map->ptr[idx].ifname == '\0') 235 return (NULL); 236 return &map->ptr[idx]; 237 } 238 239 static void 240 print_nhop_entry_sysctl(const char *name, struct rt_msghdr *rtm, struct nhop_external *nh) 241 { 242 char buffer[128]; 243 char iface_name[128]; 244 int protrusion; 245 char gw_addr[64]; 246 struct nhop_addrs *na; 247 struct sockaddr *sa_gw, *sa_ifa; 248 249 xo_open_instance(name); 250 251 snprintf(buffer, sizeof(buffer), "{[:-%d}{:index/%%lu}{]:} ", wid_nhidx); 252 //xo_emit("{t:index/%-lu} ", wid_nhidx, nh->nh_idx); 253 xo_emit(buffer, nh->nh_idx); 254 255 if (Wflag) { 256 char *cp = nh_types[nh->nh_type]; 257 xo_emit("{t:type_str/%*s} ", wid_nhtype, cp); 258 } 259 memset(iface_name, 0, sizeof(iface_name)); 260 if (nh->ifindex < (uint32_t)ifmap_size) { 261 strlcpy(iface_name, ifmap[nh->ifindex].ifname, 262 sizeof(iface_name)); 263 if (*iface_name == '\0') 264 strlcpy(iface_name, "---", sizeof(iface_name)); 265 } 266 267 na = (struct nhop_addrs *)((char *)nh + nh->nh_len); 268 //inet_ntop(nh->nh_family, &nh->nh_src, src_addr, sizeof(src_addr)); 269 //protrusion = p_addr("ifa", src_addr, wid_dst); 270 sa_gw = (struct sockaddr *)((char *)na + na->gw_sa_off); 271 sa_ifa = (struct sockaddr *)((char *)na + na->src_sa_off); 272 protrusion = p_sockaddr("ifa", sa_ifa, NULL, RTF_HOST, wid_dst); 273 274 if (nh->nh_flags & NHF_GATEWAY) { 275 const char *cp; 276 cp = fmt_sockaddr(sa_gw, NULL, RTF_HOST); 277 strlcpy(gw_addr, cp, sizeof(gw_addr)); 278 } else 279 snprintf(gw_addr, sizeof(gw_addr), "%s/resolve", iface_name); 280 protrusion = print_addr("gateway", gw_addr, wid_dst - protrusion); 281 282 nhop_map_update(&global_nhop_map, nh->nh_idx, gw_addr, iface_name); 283 284 snprintf(buffer, sizeof(buffer), "{[:-%d}{:flags/%%s}{]:} ", 285 wid_flags - protrusion); 286 287 //p_nhflags(nh->nh_flags, buffer); 288 print_flags_generic(rtm->rtm_flags, rt_bits, buffer, "rt_flags_pretty"); 289 290 if (Wflag) { 291 xo_emit("{t:use/%*lu} ", wid_pksent, nh->nh_pksent); 292 xo_emit("{t:mtu/%*lu} ", wid_mtu, nh->nh_mtu); 293 } 294 //printf("IDX: %d IFACE: %s FAMILY: %d TYPE: %d FLAGS: %X GW \n"); 295 296 if (Wflag) 297 xo_emit("{t:interface-name/%*s}", wid_if, iface_name); 298 else 299 xo_emit("{t:interface-name/%*.*s}", wid_if, wid_if, iface_name); 300 301 memset(iface_name, 0, sizeof(iface_name)); 302 if (nh->aifindex < (uint32_t)ifmap_size && nh->ifindex != nh->aifindex) { 303 strlcpy(iface_name, ifmap[nh->aifindex].ifname, 304 sizeof(iface_name)); 305 if (*iface_name == '\0') 306 strlcpy(iface_name, "---", sizeof(iface_name)); 307 } 308 if (Wflag) 309 xo_emit("{t:address-interface-name/%*s}", wid_if, iface_name); 310 311 xo_emit("{t:refcount/%*lu} ", wid_refcnt, nh->nh_refcount); 312 if (Wflag && nh->prepend_len) { 313 int max_bytes = MIN(nh->prepend_len, sizeof(buffer) / 2 - 1); 314 for (int i = 0; i < max_bytes; i++) 315 snprintf(&buffer[i * 2], 3, "%02X", nh->nh_prepend[i]); 316 xo_emit(" {:nhop-prepend/%*s}", wid_prepend, buffer); 317 } 318 319 xo_emit("\n"); 320 xo_close_instance(name); 321 } 322 323 static int 324 cmp_nh_idx(const void *_a, const void *_b) 325 { 326 const struct nhops_map *a, *b; 327 328 a = _a; 329 b = _b; 330 331 if (a->idx > b->idx) 332 return (1); 333 else if (a->idx < b->idx) 334 return (-1); 335 return (0); 336 } 337 338 void 339 dump_nhops_sysctl(int fibnum, int af, struct nhops_dump *nd) 340 { 341 size_t needed; 342 int mib[7]; 343 char *buf, *next, *lim; 344 struct rt_msghdr *rtm; 345 struct nhop_external *nh; 346 struct nhops_map *nh_map; 347 size_t nh_count, nh_size; 348 349 mib[0] = CTL_NET; 350 mib[1] = PF_ROUTE; 351 mib[2] = 0; 352 mib[3] = af; 353 mib[4] = NET_RT_NHOP; 354 mib[5] = 0; 355 mib[6] = fibnum; 356 if (sysctl(mib, nitems(mib), NULL, &needed, NULL, 0) < 0) 357 err(EX_OSERR, "sysctl: net.route.0.%d.nhdump.%d estimate", af, 358 fibnum); 359 if ((buf = malloc(needed)) == NULL) 360 errx(2, "malloc(%lu)", (unsigned long)needed); 361 if (sysctl(mib, nitems(mib), buf, &needed, NULL, 0) < 0) 362 err(1, "sysctl: net.route.0.%d.nhdump.%d", af, fibnum); 363 lim = buf + needed; 364 365 /* 366 * nexhops are received unsorted. Collect everything first, sort and then display 367 * sorted. 368 */ 369 nh_count = 0; 370 nh_size = 16; 371 nh_map = calloc(nh_size, sizeof(struct nhops_map)); 372 for (next = buf; next < lim; next += rtm->rtm_msglen) { 373 rtm = (struct rt_msghdr *)next; 374 if (rtm->rtm_version != RTM_VERSION) 375 continue; 376 377 if (nh_count >= nh_size) { 378 nh_size *= 2; 379 nh_map = realloc(nh_map, nh_size * sizeof(struct nhops_map)); 380 } 381 382 nh = (struct nhop_external *)(rtm + 1); 383 nh_map[nh_count].idx = nh->nh_idx; 384 nh_map[nh_count].rtm = rtm; 385 nh_count++; 386 } 387 388 if (nh_count > 0) 389 qsort(nh_map, nh_count, sizeof(struct nhops_map), cmp_nh_idx); 390 nd->nh_buf = buf; 391 nd->nh_count = nh_count; 392 nd->nh_map = nh_map; 393 } 394 395 static void 396 print_nhops_sysctl(int fibnum, int af) 397 { 398 struct nhops_dump nd; 399 struct nhop_external *nh; 400 int fam; 401 struct rt_msghdr *rtm; 402 403 dump_nhops_sysctl(fibnum, af, &nd); 404 405 xo_open_container("nhop-table"); 406 xo_open_list("rt-family"); 407 if (nd.nh_count > 0) { 408 nh = (struct nhop_external *)(nd.nh_map[0].rtm + 1); 409 fam = nh->nh_family; 410 411 wid_dst = WID_GW_DEFAULT(fam); 412 wid_gw = WID_GW_DEFAULT(fam); 413 wid_nhidx = 5; 414 wid_nhtype = 12; 415 wid_refcnt = 6; 416 wid_flags = 6; 417 wid_pksent = 8; 418 wid_mtu = 6; 419 wid_if = WID_IF_DEFAULT(fam); 420 xo_open_instance("rt-family"); 421 pr_family(fam); 422 xo_open_list("nh-entry"); 423 424 print_nhop_header(fam); 425 426 for (size_t i = 0; i < nd.nh_count; i++) { 427 rtm = nd.nh_map[i].rtm; 428 nh = (struct nhop_external *)(rtm + 1); 429 print_nhop_entry_sysctl("nh-entry", rtm, nh); 430 } 431 432 xo_close_list("nh-entry"); 433 xo_close_instance("rt-family"); 434 } 435 xo_close_list("rt-family"); 436 xo_close_container("nhop-table"); 437 free(nd.nh_buf); 438 } 439 440 static void 441 p_nhflags(int f, const char *format) 442 { 443 struct bits *p; 444 char *pretty_name = "nh_flags_pretty"; 445 446 xo_emit(format, fmt_flags(nh_bits, f)); 447 448 xo_open_list(pretty_name); 449 for (p = nh_bits; p->b_mask; p++) 450 if (p->b_mask & f) 451 xo_emit("{le:nh_flags_pretty/%s}", p->b_name); 452 xo_close_list(pretty_name); 453 } 454 455 void 456 nhops_print(int fibnum, int af) 457 { 458 size_t intsize; 459 int numfibs; 460 461 intsize = sizeof(int); 462 if (fibnum == -1 && 463 sysctlbyname("net.my_fibnum", &fibnum, &intsize, NULL, 0) == -1) 464 fibnum = 0; 465 if (sysctlbyname("net.fibs", &numfibs, &intsize, NULL, 0) == -1) 466 numfibs = 1; 467 if (fibnum < 0 || fibnum > numfibs - 1) 468 errx(EX_USAGE, "%d: invalid fib", fibnum); 469 470 ifmap = prepare_ifmap(&ifmap_size); 471 472 xo_open_container("route-nhop-information"); 473 xo_emit("{T:Nexthop data}"); 474 if (fibnum) 475 xo_emit(" ({L:fib}: {:fib/%d})", fibnum); 476 xo_emit("\n"); 477 print_nhops_sysctl(fibnum, af); 478 xo_close_container("route-nhop-information"); 479 } 480 481