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 * $FreeBSD$ 32 */ 33 34 #include <sys/cdefs.h> 35 #include <sys/param.h> 36 #include <sys/protosw.h> 37 #include <sys/socket.h> 38 #include <sys/socketvar.h> 39 #include <sys/sysctl.h> 40 #include <sys/time.h> 41 42 #include <net/ethernet.h> 43 #include <net/if.h> 44 #include <net/if_dl.h> 45 #include <net/if_types.h> 46 #include <net/route.h> 47 #include <net/route/nhop.h> 48 49 #include <netinet/in.h> 50 #include <netgraph/ng_socket.h> 51 52 #include <arpa/inet.h> 53 #include <ifaddrs.h> 54 #include <libutil.h> 55 #include <netdb.h> 56 #include <stdbool.h> 57 #include <stdint.h> 58 #include <stdio.h> 59 #include <stdlib.h> 60 #include <stdbool.h> 61 #include <string.h> 62 #include <sysexits.h> 63 #include <unistd.h> 64 #include <err.h> 65 #include <libxo/xo.h> 66 #include "netstat.h" 67 #include "common.h" 68 69 /* column widths; each followed by one space */ 70 #ifndef INET6 71 #define WID_DST_DEFAULT(af) 18 /* width of destination column */ 72 #define WID_GW_DEFAULT(af) 18 /* width of gateway column */ 73 #define WID_IF_DEFAULT(af) (Wflag ? 10 : 8) /* width of netif column */ 74 #else 75 #define WID_DST_DEFAULT(af) \ 76 ((af) == AF_INET6 ? (numeric_addr ? 33: 18) : 18) 77 #define WID_GW_DEFAULT(af) \ 78 ((af) == AF_INET6 ? (numeric_addr ? 29 : 18) : 18) 79 #define WID_IF_DEFAULT(af) ((af) == AF_INET6 ? 8 : (Wflag ? 10 : 8)) 80 #endif /*INET6*/ 81 static int wid_dst; 82 static int wid_gw; 83 static int wid_flags; 84 static int wid_pksent; 85 static int wid_mtu; 86 static int wid_if; 87 static int wid_nhidx; 88 static int wid_nhtype; 89 static int wid_refcnt; 90 static int wid_prepend; 91 92 static struct bits nh_bits[] = { 93 { NHF_REJECT, 'R', "reject" }, 94 { NHF_BLACKHOLE,'B', "blackhole" }, 95 { NHF_REDIRECT, 'r', "redirect" }, 96 { NHF_GATEWAY, 'G', "gateway" }, 97 { NHF_DEFAULT, 'd', "default" }, 98 { NHF_BROADCAST,'b', "broadcast" }, 99 { 0 , 0, NULL } 100 }; 101 102 static char *nh_types[] = { 103 "empty", /* 0 */ 104 "v4/resolve", /* 1 */ 105 "v4/gw", 106 "v6/resolve", 107 "v6/gw" 108 }; 109 110 struct nhop_entry { 111 char gw[64]; 112 char ifname[IFNAMSIZ]; 113 }; 114 115 struct nhop_map { 116 struct nhop_entry *ptr; 117 size_t size; 118 }; 119 static struct nhop_map global_nhop_map; 120 121 static struct nhop_entry *nhop_get(struct nhop_map *map, uint32_t idx); 122 123 124 static struct ifmap_entry *ifmap; 125 static size_t ifmap_size; 126 127 static void 128 print_sockaddr_buf(char *buf, size_t bufsize, const struct sockaddr *sa) 129 { 130 131 switch (sa->sa_family) { 132 case AF_INET: 133 inet_ntop(AF_INET, &((struct sockaddr_in *)sa)->sin_addr, 134 buf, bufsize); 135 break; 136 case AF_INET6: 137 inet_ntop(AF_INET6, &((struct sockaddr_in6 *)sa)->sin6_addr, 138 buf, bufsize); 139 break; 140 default: 141 snprintf(buf, bufsize, "unknown:%d", sa->sa_family); 142 break; 143 } 144 } 145 146 static int 147 print_addr(const char *name, const char *addr, int width) 148 { 149 char buf[128]; 150 int protrusion; 151 152 if (width < 0) { 153 snprintf(buf, sizeof(buf), "{:%s/%%s} ", name); 154 xo_emit(buf, addr); 155 protrusion = 0; 156 } else { 157 if (Wflag != 0 || numeric_addr) { 158 snprintf(buf, sizeof(buf), "{[:%d}{:%s/%%s}{]:} ", 159 -width, name); 160 xo_emit(buf, addr); 161 protrusion = strlen(addr) - width; 162 if (protrusion < 0) 163 protrusion = 0; 164 } else { 165 snprintf(buf, sizeof(buf), "{[:%d}{:%s/%%-.*s}{]:} ", 166 -width, name); 167 xo_emit(buf, width, addr); 168 protrusion = 0; 169 } 170 } 171 return (protrusion); 172 } 173 174 175 static void 176 print_nhop_header(int af1 __unused) 177 { 178 179 if (Wflag) { 180 xo_emit("{T:/%-*.*s} {T:/%-*.*s} {T:/%-*.*s} {T:/%-*.*s} {T:/%*.*s} " 181 "{T:/%*.*s} {T:/%-*.*s} {T:/%*.*s} {T:/%*.*s} {T:/%*.*s} {T:/%*s}\n", 182 wid_nhidx, wid_nhidx, "Idx", 183 wid_nhtype, wid_nhtype, "Type", 184 wid_dst, wid_dst, "IFA", 185 wid_gw, wid_gw, "Gateway", 186 wid_flags, wid_flags, "Flags", 187 wid_pksent, wid_pksent, "Use", 188 wid_mtu, wid_mtu, "Mtu", 189 wid_if, wid_if, "Netif", 190 wid_if, wid_if, "Addrif", 191 wid_refcnt, wid_refcnt, "Refcnt", 192 wid_prepend, "Prepend"); 193 } else { 194 xo_emit("{T:/%-*.*s} {T:/%-*.*s} {T:/%-*.*s} {T:/%-*.*s} {T:/%*.*s} " 195 " {T:/%*s}\n", 196 wid_nhidx, wid_nhidx, "Idx", 197 wid_dst, wid_dst, "IFA", 198 wid_gw, wid_gw, "Gateway", 199 wid_flags, wid_flags, "Flags", 200 wid_if, wid_if, "Netif", 201 wid_prepend, "Refcnt"); 202 } 203 } 204 205 void 206 nhop_map_update(struct nhop_map *map, uint32_t idx, char *gw, char *ifname) 207 { 208 if (idx >= map->size) { 209 uint32_t new_size; 210 size_t sz; 211 if (map->size == 0) 212 new_size = 32; 213 else 214 new_size = map->size * 2; 215 if (new_size <= idx) 216 new_size = roundup2(idx + 1, 32); 217 218 sz = new_size * (sizeof(struct nhop_entry)); 219 if ((map->ptr = realloc(map->ptr, sz)) == NULL) 220 errx(2, "realloc(%zu) failed", sz); 221 222 memset(&map->ptr[map->size], 0, (new_size - map->size) * sizeof(struct nhop_entry)); 223 map->size = new_size; 224 } 225 226 strlcpy(map->ptr[idx].ifname, ifname, sizeof(map->ptr[idx].ifname)); 227 strlcpy(map->ptr[idx].gw, gw, sizeof(map->ptr[idx].gw)); 228 } 229 230 static struct nhop_entry * 231 nhop_get(struct nhop_map *map, uint32_t idx) 232 { 233 234 if (idx >= map->size) 235 return (NULL); 236 if (*map->ptr[idx].ifname == '\0') 237 return (NULL); 238 return &map->ptr[idx]; 239 } 240 241 static void 242 print_nhop_entry_sysctl(const char *name, struct rt_msghdr *rtm, struct nhop_external *nh) 243 { 244 char buffer[128]; 245 char iface_name[128]; 246 int protrusion; 247 char gw_addr[64]; 248 struct nhop_addrs *na; 249 struct sockaddr *sa_gw, *sa_ifa; 250 251 xo_open_instance(name); 252 253 snprintf(buffer, sizeof(buffer), "{[:-%d}{:index/%%lu}{]:} ", wid_nhidx); 254 //xo_emit("{t:index/%-lu} ", wid_nhidx, nh->nh_idx); 255 xo_emit(buffer, nh->nh_idx); 256 257 if (Wflag) { 258 char *cp = nh_types[nh->nh_type]; 259 xo_emit("{t:type_str/%*s} ", wid_nhtype, cp); 260 } 261 memset(iface_name, 0, sizeof(iface_name)); 262 if (nh->ifindex < (uint32_t)ifmap_size) { 263 strlcpy(iface_name, ifmap[nh->ifindex].ifname, 264 sizeof(iface_name)); 265 if (*iface_name == '\0') 266 strlcpy(iface_name, "---", sizeof(iface_name)); 267 } 268 269 na = (struct nhop_addrs *)((char *)nh + nh->nh_len); 270 //inet_ntop(nh->nh_family, &nh->nh_src, src_addr, sizeof(src_addr)); 271 //protrusion = p_addr("ifa", src_addr, wid_dst); 272 sa_gw = (struct sockaddr *)((char *)na + na->gw_sa_off); 273 sa_ifa = (struct sockaddr *)((char *)na + na->src_sa_off); 274 protrusion = p_sockaddr("ifa", sa_ifa, NULL, RTF_HOST, wid_dst); 275 276 if (nh->nh_flags & NHF_GATEWAY) { 277 const char *cp; 278 cp = fmt_sockaddr(sa_gw, NULL, RTF_HOST); 279 strlcpy(gw_addr, cp, sizeof(gw_addr)); 280 } else 281 snprintf(gw_addr, sizeof(gw_addr), "%s/resolve", iface_name); 282 protrusion = print_addr("gateway", gw_addr, wid_dst - protrusion); 283 284 nhop_map_update(&global_nhop_map, nh->nh_idx, gw_addr, iface_name); 285 286 snprintf(buffer, sizeof(buffer), "{[:-%d}{:flags/%%s}{]:} ", 287 wid_flags - protrusion); 288 289 //p_nhflags(nh->nh_flags, buffer); 290 print_flags_generic(rtm->rtm_flags, rt_bits, buffer, "rt_flags_pretty"); 291 292 if (Wflag) { 293 xo_emit("{t:use/%*lu} ", wid_pksent, nh->nh_pksent); 294 xo_emit("{t:mtu/%*lu} ", wid_mtu, nh->nh_mtu); 295 } 296 //printf("IDX: %d IFACE: %s FAMILY: %d TYPE: %d FLAGS: %X GW \n"); 297 298 if (Wflag) 299 xo_emit("{t:interface-name/%*s}", wid_if, iface_name); 300 else 301 xo_emit("{t:interface-name/%*.*s}", wid_if, wid_if, iface_name); 302 303 memset(iface_name, 0, sizeof(iface_name)); 304 if (nh->aifindex < (uint32_t)ifmap_size && nh->ifindex != nh->aifindex) { 305 strlcpy(iface_name, ifmap[nh->aifindex].ifname, 306 sizeof(iface_name)); 307 if (*iface_name == '\0') 308 strlcpy(iface_name, "---", sizeof(iface_name)); 309 } 310 if (Wflag) 311 xo_emit("{t:address-interface-name/%*s}", wid_if, iface_name); 312 313 xo_emit("{t:refcount/%*lu} ", wid_refcnt, nh->nh_refcount); 314 if (Wflag && nh->prepend_len) { 315 int max_bytes = MIN(nh->prepend_len, sizeof(buffer) / 2 - 1); 316 for (int i = 0; i < max_bytes; i++) 317 snprintf(&buffer[i * 2], 3, "%02X", nh->nh_prepend[i]); 318 xo_emit(" {:nhop-prepend/%*s}", wid_prepend, buffer); 319 } 320 321 xo_emit("\n"); 322 xo_close_instance(name); 323 } 324 325 static int 326 cmp_nh_idx(const void *_a, const void *_b) 327 { 328 const struct nhops_map *a, *b; 329 330 a = _a; 331 b = _b; 332 333 if (a->idx > b->idx) 334 return (1); 335 else if (a->idx < b->idx) 336 return (-1); 337 return (0); 338 } 339 340 void 341 dump_nhops_sysctl(int fibnum, int af, struct nhops_dump *nd) 342 { 343 size_t needed; 344 int mib[7]; 345 char *buf, *next, *lim; 346 struct rt_msghdr *rtm; 347 struct nhop_external *nh; 348 struct nhops_map *nh_map; 349 size_t nh_count, nh_size; 350 351 mib[0] = CTL_NET; 352 mib[1] = PF_ROUTE; 353 mib[2] = 0; 354 mib[3] = af; 355 mib[4] = NET_RT_NHOP; 356 mib[5] = 0; 357 mib[6] = fibnum; 358 if (sysctl(mib, nitems(mib), NULL, &needed, NULL, 0) < 0) 359 err(EX_OSERR, "sysctl: net.route.0.%d.nhdump.%d estimate", af, 360 fibnum); 361 if ((buf = malloc(needed)) == NULL) 362 errx(2, "malloc(%lu)", (unsigned long)needed); 363 if (sysctl(mib, nitems(mib), buf, &needed, NULL, 0) < 0) 364 err(1, "sysctl: net.route.0.%d.nhdump.%d", af, fibnum); 365 lim = buf + needed; 366 367 /* 368 * nexhops are received unsorted. Collect everything first, sort and then display 369 * sorted. 370 */ 371 nh_count = 0; 372 nh_size = 16; 373 nh_map = calloc(nh_size, sizeof(struct nhops_map)); 374 for (next = buf; next < lim; next += rtm->rtm_msglen) { 375 rtm = (struct rt_msghdr *)next; 376 if (rtm->rtm_version != RTM_VERSION) 377 continue; 378 379 if (nh_count >= nh_size) { 380 nh_size *= 2; 381 nh_map = realloc(nh_map, nh_size * sizeof(struct nhops_map)); 382 } 383 384 nh = (struct nhop_external *)(rtm + 1); 385 nh_map[nh_count].idx = nh->nh_idx; 386 nh_map[nh_count].rtm = rtm; 387 nh_count++; 388 } 389 390 if (nh_count > 0) 391 qsort(nh_map, nh_count, sizeof(struct nhops_map), cmp_nh_idx); 392 nd->nh_buf = buf; 393 nd->nh_count = nh_count; 394 nd->nh_map = nh_map; 395 } 396 397 static void 398 print_nhops_sysctl(int fibnum, int af) 399 { 400 struct nhops_dump nd; 401 struct nhop_external *nh; 402 int fam; 403 struct rt_msghdr *rtm; 404 405 dump_nhops_sysctl(fibnum, af, &nd); 406 407 xo_open_container("nhop-table"); 408 xo_open_list("rt-family"); 409 if (nd.nh_count > 0) { 410 nh = (struct nhop_external *)(nd.nh_map[0].rtm + 1); 411 fam = nh->nh_family; 412 413 wid_dst = WID_GW_DEFAULT(fam); 414 wid_gw = WID_GW_DEFAULT(fam); 415 wid_nhidx = 5; 416 wid_nhtype = 12; 417 wid_refcnt = 6; 418 wid_flags = 6; 419 wid_pksent = 8; 420 wid_mtu = 6; 421 wid_if = WID_IF_DEFAULT(fam); 422 xo_open_instance("rt-family"); 423 pr_family(fam); 424 xo_open_list("nh-entry"); 425 426 print_nhop_header(fam); 427 428 for (size_t i = 0; i < nd.nh_count; i++) { 429 rtm = nd.nh_map[i].rtm; 430 nh = (struct nhop_external *)(rtm + 1); 431 print_nhop_entry_sysctl("nh-entry", rtm, nh); 432 } 433 434 xo_close_list("nh-entry"); 435 xo_close_instance("rt-family"); 436 } 437 xo_close_list("rt-family"); 438 xo_close_container("nhop-table"); 439 free(nd.nh_buf); 440 } 441 442 static void 443 p_nhflags(int f, const char *format) 444 { 445 struct bits *p; 446 char *pretty_name = "nh_flags_pretty"; 447 448 xo_emit(format, fmt_flags(nh_bits, f)); 449 450 xo_open_list(pretty_name); 451 for (p = nh_bits; p->b_mask; p++) 452 if (p->b_mask & f) 453 xo_emit("{le:nh_flags_pretty/%s}", p->b_name); 454 xo_close_list(pretty_name); 455 } 456 457 void 458 nhops_print(int fibnum, int af) 459 { 460 size_t intsize; 461 int numfibs; 462 463 intsize = sizeof(int); 464 if (fibnum == -1 && 465 sysctlbyname("net.my_fibnum", &fibnum, &intsize, NULL, 0) == -1) 466 fibnum = 0; 467 if (sysctlbyname("net.fibs", &numfibs, &intsize, NULL, 0) == -1) 468 numfibs = 1; 469 if (fibnum < 0 || fibnum > numfibs - 1) 470 errx(EX_USAGE, "%d: invalid fib", fibnum); 471 472 ifmap = prepare_ifmap(&ifmap_size); 473 474 xo_open_container("route-nhop-information"); 475 xo_emit("{T:Nexthop data}"); 476 if (fibnum) 477 xo_emit(" ({L:fib}: {:fib/%d})", fibnum); 478 xo_emit("\n"); 479 print_nhops_sysctl(fibnum, af); 480 xo_close_container("route-nhop-information"); 481 } 482 483