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