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