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