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
print_sockaddr_buf(char * buf,size_t bufsize,const struct sockaddr * sa)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
print_addr(const char * name,const char * addr,int width)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
print_nhop_header(int af1 __unused)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
nhop_map_update(struct nhop_map * map,uint32_t idx,char * gw,char * ifname)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 *
nhop_get(struct nhop_map * map,uint32_t idx)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
print_nhop_entry_sysctl(const char * name,struct rt_msghdr * rtm,struct nhop_external * nh)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
cmp_nh_idx(const void * _a,const void * _b)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
dump_nhops_sysctl(int fibnum,int af,struct nhops_dump * nd)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
print_nhops_sysctl(int fibnum,int af)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
p_nhflags(int f,const char * format)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
nhops_print(int fibnum,int af)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