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