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/cdefs.h>
33 #include <sys/param.h>
34 #include <sys/protosw.h>
35 #include <sys/socket.h>
36 #include <sys/socketvar.h>
37 #include <sys/sysctl.h>
38 #include <sys/time.h>
39
40 #include <net/ethernet.h>
41 #include <net/if.h>
42 #include <net/if_dl.h>
43 #include <net/if_types.h>
44 #include <net/route.h>
45 #include <net/route/nhop.h>
46
47 #include <netinet/in.h>
48 #include <netgraph/ng_socket.h>
49
50 #include <arpa/inet.h>
51 #include <ifaddrs.h>
52 #include <libutil.h>
53 #include <netdb.h>
54 #include <stdbool.h>
55 #include <stdint.h>
56 #include <stdio.h>
57 #include <stdlib.h>
58 #include <stdbool.h>
59 #include <string.h>
60 #include <sysexits.h>
61 #include <unistd.h>
62 #include <err.h>
63 #include <libxo/xo.h>
64 #include "netstat.h"
65 #include "common.h"
66
67 /* column widths; each followed by one space */
68 #define WID_IF_DEFAULT (Wflag ? IFNAMSIZ : 12) /* width of netif column */
69 #ifndef INET6
70 #define WID_DST_DEFAULT(af) 18 /* width of destination column */
71 #define WID_GW_DEFAULT(af) 18 /* width of gateway column */
72 #else
73 #define WID_DST_DEFAULT(af) \
74 ((af) == AF_INET6 ? (numeric_addr ? 33: 18) : 18)
75 #define WID_GW_DEFAULT(af) \
76 ((af) == AF_INET6 ? (numeric_addr ? 29 : 18) : 18)
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
print_sockaddr_buf(char * buf,size_t bufsize,const struct sockaddr * sa)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
print_addr(const char * name,const char * addr,int width)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
print_nhop_header(int af1 __unused)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
nhop_map_update(struct nhop_map * map,uint32_t idx,char * gw,char * ifname)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 *
nhop_get(struct nhop_map * map,uint32_t idx)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
print_nhop_entry_sysctl(const char * name,struct rt_msghdr * rtm,struct nhop_external * nh)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
cmp_nh_idx(const void * _a,const void * _b)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
dump_nhops_sysctl(int fibnum,int af,struct nhops_dump * nd)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
print_nhops_sysctl(int fibnum,int af)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;
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
p_nhflags(int f,const char * format)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
nhops_print(int fibnum,int af)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