xref: /freebsd/usr.bin/systat/netstat.c (revision d056fa046c6a91b90cd98165face0e42a33a5173) 
1 /*-
2  * Copyright (c) 1980, 1992, 1993
3  *	The Regents of the University of California.  All rights reserved.
4  *
5  * Redistribution and use in source and binary forms, with or without
6  * modification, are permitted provided that the following conditions
7  * are met:
8  * 1. Redistributions of source code must retain the above copyright
9  *    notice, this list of conditions and the following disclaimer.
10  * 2. Redistributions in binary form must reproduce the above copyright
11  *    notice, this list of conditions and the following disclaimer in the
12  *    documentation and/or other materials provided with the distribution.
13  * 3. All advertising materials mentioning features or use of this software
14  *    must display the following acknowledgement:
15  *	This product includes software developed by the University of
16  *	California, Berkeley and its contributors.
17  * 4. Neither the name of the University nor the names of its contributors
18  *    may be used to endorse or promote products derived from this software
19  *    without specific prior written permission.
20  *
21  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
22  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
25  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31  * SUCH DAMAGE.
32  */
33 
34 #include <sys/cdefs.h>
35 
36 __FBSDID("$FreeBSD$");
37 
38 #ifdef lint
39 static const char sccsid[] = "@(#)netstat.c	8.1 (Berkeley) 6/6/93";
40 #endif
41 
42 /*
43  * netstat
44  */
45 #include <sys/param.h>
46 #include <sys/queue.h>
47 #include <sys/socket.h>
48 #include <sys/socketvar.h>
49 #include <sys/protosw.h>
50 
51 #include <netinet/in.h>
52 #include <arpa/inet.h>
53 #include <net/route.h>
54 #include <netinet/in_systm.h>
55 #include <netinet/ip.h>
56 #ifdef INET6
57 #include <netinet/ip6.h>
58 #endif
59 #include <netinet/in_pcb.h>
60 #include <netinet/ip_icmp.h>
61 #include <netinet/icmp_var.h>
62 #include <netinet/ip_var.h>
63 #include <netinet/tcp.h>
64 #include <netinet/tcpip.h>
65 #include <netinet/tcp_seq.h>
66 #include <netinet/tcp_var.h>
67 #define TCPSTATES
68 #include <netinet/tcp_fsm.h>
69 #include <netinet/tcp_timer.h>
70 #include <netinet/tcp_var.h>
71 #include <netinet/tcp_debug.h>
72 #include <netinet/udp.h>
73 #include <netinet/udp_var.h>
74 
75 #include <netdb.h>
76 #include <nlist.h>
77 #include <paths.h>
78 #include <stdlib.h>
79 #include <string.h>
80 
81 #include "systat.h"
82 #include "extern.h"
83 
84 static struct netinfo *enter(struct inpcb *, int, const char *);
85 static void enter_kvm(struct inpcb *, struct socket *, int, const char *);
86 static void enter_sysctl(struct inpcb *, struct xsocket *, int, const char *);
87 static void fetchnetstat_kvm(void);
88 static void fetchnetstat_sysctl(void);
89 static char *inetname(struct sockaddr *);
90 static void inetprint(struct sockaddr *, const char *);
91 
92 #define	streq(a,b)	(strcmp(a,b)==0)
93 #define	YMAX(w)		((w)->_maxy-1)
94 
95 WINDOW *
96 opennetstat()
97 {
98 	sethostent(1);
99 	setnetent(1);
100 	return (subwin(stdscr, LINES-3-1, 0, MAINWIN_ROW, 0));
101 }
102 
103 struct netinfo {
104 	TAILQ_ENTRY(netinfo) chain;
105 	short	ni_line;		/* line on screen */
106 	short	ni_seen;		/* 0 when not present in list */
107 	short	ni_flags;
108 #define	NIF_LACHG	0x1		/* local address changed */
109 #define	NIF_FACHG	0x2		/* foreign address changed */
110 	short	ni_state;		/* tcp state */
111 	const char	*ni_proto;		/* protocol */
112 	struct sockaddr_storage ni_lsa;	/* local address */
113 	struct sockaddr_storage	ni_fsa;	/* foreign address */
114 	u_int	ni_rcvcc;		/* rcv buffer character count */
115 	u_int	ni_sndcc;		/* snd buffer character count */
116 };
117 
118 TAILQ_HEAD(netinfohead, netinfo) netcb = TAILQ_HEAD_INITIALIZER(netcb);
119 
120 static	int aflag = 0;
121 static	int nflag = 0;
122 static	int lastrow = 1;
123 
124 void
125 closenetstat(w)
126         WINDOW *w;
127 {
128 	struct netinfo *p;
129 
130 	endhostent();
131 	endnetent();
132 	TAILQ_FOREACH(p, &netcb, chain) {
133 		if (p->ni_line != -1)
134 			lastrow--;
135 		p->ni_line = -1;
136 	}
137         if (w != NULL) {
138 		wclear(w);
139 		wrefresh(w);
140 		delwin(w);
141 	}
142 }
143 
144 static const char *miblist[] = {
145 	"net.inet.tcp.pcblist",
146 	"net.inet.udp.pcblist"
147 };
148 
149 struct nlist namelist[] = {
150 #define	X_TCB	0
151 	{ "tcb" },
152 #define	X_UDB	1
153 	{ "udb" },
154 	{ "" },
155 };
156 
157 int
158 initnetstat()
159 {
160 	protos = TCP|UDP;
161 	return(1);
162 }
163 
164 void
165 fetchnetstat()
166 {
167 	if (use_kvm)
168 		fetchnetstat_kvm();
169 	else
170 		fetchnetstat_sysctl();
171 }
172 
173 static void
174 fetchnetstat_kvm()
175 {
176 	struct inpcb *next;
177 	struct netinfo *p;
178 	struct inpcbhead head;
179 	struct inpcb inpcb;
180 	struct socket sockb;
181 	struct tcpcb tcpcb;
182 	void *off;
183 	int istcp;
184 
185 	if (namelist[X_TCB].n_value == 0)
186 		return;
187 	TAILQ_FOREACH(p, &netcb, chain)
188 		p->ni_seen = 0;
189 	if (protos&TCP) {
190 		off = NPTR(X_TCB);
191 		istcp = 1;
192 	}
193 	else if (protos&UDP) {
194 		off = NPTR(X_UDB);
195 		istcp = 0;
196 	}
197 	else {
198 		error("No protocols to display");
199 		return;
200 	}
201 again:
202 	KREAD(off, &head, sizeof (struct inpcbhead));
203 	LIST_FOREACH(next, &head, inp_list) {
204 		KREAD(next, &inpcb, sizeof (inpcb));
205 		next = &inpcb;
206 		if (!aflag) {
207 			if (inpcb.inp_vflag & INP_IPV4) {
208 				if (inet_lnaof(inpcb.inp_laddr) == INADDR_ANY)
209 					continue;
210 			}
211 #ifdef INET6
212 			else if (inpcb.inp_vflag & INP_IPV6) {
213 				if (memcmp(&inpcb.in6p_laddr,
214 				    &in6addr_any, sizeof(in6addr_any)) == 0)
215 					continue;
216 			}
217 #endif
218 		}
219 		if (nhosts && !checkhost(&inpcb))
220 			continue;
221 		if (nports && !checkport(&inpcb))
222 			continue;
223 		if (istcp) {
224 			if (inpcb.inp_vflag & INP_TIMEWAIT) {
225 				bzero(&sockb, sizeof(sockb));
226 				enter_kvm(&inpcb, &sockb, TCPS_TIME_WAIT,
227 					 "tcp");
228 			} else {
229 				KREAD(inpcb.inp_socket, &sockb,
230 					sizeof (sockb));
231 				KREAD(inpcb.inp_ppcb, &tcpcb, sizeof (tcpcb));
232 				enter_kvm(&inpcb, &sockb, tcpcb.t_state,
233 					"tcp");
234 			}
235 		} else
236 			enter_kvm(&inpcb, &sockb, 0, "udp");
237 	}
238 	if (istcp && (protos&UDP)) {
239 		istcp = 0;
240 		off = NPTR(X_UDB);
241 		goto again;
242 	}
243 }
244 
245 static void
246 fetchnetstat_sysctl()
247 {
248 	struct netinfo *p;
249 	int idx;
250 	struct xinpgen *inpg;
251 	char *cur, *end;
252 	struct inpcb *inpcb;
253 	struct xinpcb *xip;
254 	struct xtcpcb *xtp;
255 	int plen;
256 	size_t lsz;
257 
258 	TAILQ_FOREACH(p, &netcb, chain)
259 		p->ni_seen = 0;
260 	if (protos&TCP) {
261 		idx = 0;
262 	} else if (protos&UDP) {
263 		idx = 1;
264 	} else {
265 		error("No protocols to display");
266 		return;
267 	}
268 
269 	for (;idx < 2; idx++) {
270 		if (idx == 1 && !(protos&UDP))
271 			break;
272 		inpg = (struct xinpgen *)sysctl_dynread(miblist[idx], &lsz);
273 		if (inpg == NULL) {
274 			error("sysctl(%s...) failed", miblist[idx]);
275 			continue;
276 		}
277 		/*
278 		 * We currently do no require a consistent pcb list.
279 		 * Try to be robust in case of struct size changes
280 		 */
281 		cur = ((char *)inpg) + inpg->xig_len;
282 		/* There is also a trailing struct xinpgen */
283 		end = ((char *)inpg) + lsz - inpg->xig_len;
284 		if (end <= cur) {
285 			free(inpg);
286 			continue;
287 		}
288 		if (idx == 0) { /* TCP */
289 			xtp = (struct xtcpcb *)cur;
290 			plen = xtp->xt_len;
291 		} else {
292 			xip = (struct xinpcb *)cur;
293 			plen = xip->xi_len;
294 		}
295 		while (cur + plen <= end) {
296 			if (idx == 0) { /* TCP */
297 				xtp = (struct xtcpcb *)cur;
298 				inpcb = &xtp->xt_inp;
299 			} else {
300 				xip = (struct xinpcb *)cur;
301 				inpcb = &xip->xi_inp;
302 			}
303 			cur += plen;
304 
305 			if (!aflag) {
306 				if (inpcb->inp_vflag & INP_IPV4) {
307 					if (inet_lnaof(inpcb->inp_laddr) ==
308 					    INADDR_ANY)
309 						continue;
310 				}
311 #ifdef INET6
312 				else if (inpcb->inp_vflag & INP_IPV6) {
313 					if (memcmp(&inpcb->in6p_laddr,
314 					    &in6addr_any, sizeof(in6addr_any))
315 					    == 0)
316 						continue;
317 				}
318 #endif
319 			}
320 			if (nhosts && !checkhost(inpcb))
321 				continue;
322 			if (nports && !checkport(inpcb))
323 				continue;
324 			if (idx == 0)	/* TCP */
325 				enter_sysctl(inpcb, &xtp->xt_socket,
326 				    xtp->xt_tp.t_state, "tcp");
327 			else		/* UDP */
328 				enter_sysctl(inpcb, &xip->xi_socket, 0, "udp");
329 		}
330 		free(inpg);
331 	}
332 }
333 
334 static void
335 enter_kvm(inp, so, state, proto)
336 	struct inpcb *inp;
337 	struct socket *so;
338 	int state;
339 	const char *proto;
340 {
341 	struct netinfo *p;
342 
343 	if ((p = enter(inp, state, proto)) != NULL) {
344 		p->ni_rcvcc = so->so_rcv.sb_cc;
345 		p->ni_sndcc = so->so_snd.sb_cc;
346 	}
347 }
348 
349 static void
350 enter_sysctl(inp, so, state, proto)
351 	struct inpcb *inp;
352 	struct xsocket *so;
353 	int state;
354 	const char *proto;
355 {
356 	struct netinfo *p;
357 
358 	if ((p = enter(inp, state, proto)) != NULL) {
359 		p->ni_rcvcc = so->so_rcv.sb_cc;
360 		p->ni_sndcc = so->so_snd.sb_cc;
361 	}
362 }
363 
364 
365 static struct netinfo *
366 enter(inp, state, proto)
367 	struct inpcb *inp;
368 	int state;
369 	const char *proto;
370 {
371 	struct netinfo *p;
372 	struct sockaddr_storage lsa, fsa;
373 	struct sockaddr_in *sa4;
374 #ifdef INET6
375 	struct sockaddr_in6 *sa6;
376 #endif
377 
378 	memset(&lsa, 0, sizeof(lsa));
379 	memset(&fsa, 0, sizeof(fsa));
380 	if (inp->inp_vflag & INP_IPV4) {
381 		sa4 = (struct sockaddr_in *)&lsa;
382 		sa4->sin_addr = inp->inp_laddr;
383 		sa4->sin_port = inp->inp_lport;
384 		sa4->sin_family = AF_INET;
385 		sa4->sin_len = sizeof(struct sockaddr_in);
386 
387 		sa4 = (struct sockaddr_in *)&fsa;
388 		sa4->sin_addr = inp->inp_faddr;
389 		sa4->sin_port = inp->inp_fport;
390 		sa4->sin_family = AF_INET;
391 		sa4->sin_len = sizeof(struct sockaddr_in);
392 	}
393 #ifdef INET6
394 	else if (inp->inp_vflag & INP_IPV6) {
395 		sa6 = (struct sockaddr_in6 *)&lsa;
396 		memcpy(&sa6->sin6_addr, &inp->in6p_laddr,
397 		    sizeof(struct in6_addr));
398 		sa6->sin6_port = inp->inp_lport;
399 		sa6->sin6_family = AF_INET6;
400 		sa6->sin6_len = sizeof(struct sockaddr_in6);
401 
402 		sa6 = (struct sockaddr_in6 *)&fsa;
403 		memcpy(&sa6->sin6_addr, &inp->in6p_faddr,
404 		    sizeof(struct in6_addr));
405 		sa6->sin6_port = inp->inp_fport;
406 		sa6->sin6_family = AF_INET6;
407 		sa6->sin6_len = sizeof(struct sockaddr_in6);
408 	}
409 #endif
410 	else
411 		return NULL;
412 
413 	/*
414 	 * Only take exact matches, any sockets with
415 	 * previously unbound addresses will be deleted
416 	 * below in the display routine because they
417 	 * will appear as ``not seen'' in the kernel
418 	 * data structures.
419 	 */
420 	TAILQ_FOREACH(p, &netcb, chain) {
421 		if (!streq(proto, p->ni_proto))
422 			continue;
423 		if (p->ni_lsa.ss_family != lsa.ss_family ||
424 		    memcmp(&p->ni_lsa, &lsa, lsa.ss_len) != 0)
425 			continue;
426 		if (p->ni_fsa.ss_family == fsa.ss_family &&
427 		    memcmp(&p->ni_fsa, &fsa, fsa.ss_len) == 0)
428 			break;
429 	}
430 	if (p == NULL) {
431 		if ((p = malloc(sizeof(*p))) == NULL) {
432 			error("Out of memory");
433 			return NULL;
434 		}
435 		TAILQ_INSERT_HEAD(&netcb, p, chain);
436 		p->ni_line = -1;
437 		memcpy(&p->ni_lsa, &lsa, lsa.ss_len);
438 		memcpy(&p->ni_fsa, &fsa, fsa.ss_len);
439 		p->ni_proto = strdup(proto);
440 		p->ni_flags = NIF_LACHG|NIF_FACHG;
441 	}
442 	p->ni_state = state;
443 	p->ni_seen = 1;
444 	return p;
445 }
446 
447 /* column locations */
448 #define	LADDR	0
449 #define	FADDR	LADDR+23
450 #define	PROTO	FADDR+23
451 #define	RCVCC	PROTO+6
452 #define	SNDCC	RCVCC+7
453 #define	STATE	SNDCC+7
454 
455 
456 void
457 labelnetstat()
458 {
459 	if (use_kvm && namelist[X_TCB].n_type == 0)
460 		return;
461 	wmove(wnd, 0, 0); wclrtobot(wnd);
462 	mvwaddstr(wnd, 0, LADDR, "Local Address");
463 	mvwaddstr(wnd, 0, FADDR, "Foreign Address");
464 	mvwaddstr(wnd, 0, PROTO, "Proto");
465 	mvwaddstr(wnd, 0, RCVCC, "Recv-Q");
466 	mvwaddstr(wnd, 0, SNDCC, "Send-Q");
467 	mvwaddstr(wnd, 0, STATE, "(state)");
468 }
469 
470 void
471 shownetstat()
472 {
473 	struct netinfo *p, *q;
474 	char proto[6], *family = "";
475 
476 	/*
477 	 * First, delete any connections that have gone
478 	 * away and adjust the position of connections
479 	 * below to reflect the deleted line.
480 	 */
481 	p = TAILQ_FIRST(&netcb);
482 	while (p != NULL) {
483 		if (p->ni_line == -1 || p->ni_seen) {
484 			p = TAILQ_NEXT(p, chain);
485 			continue;
486 		}
487 		wmove(wnd, p->ni_line, 0); wdeleteln(wnd);
488 		TAILQ_FOREACH(q, &netcb, chain)
489 			if (q != p && q->ni_line > p->ni_line) {
490 				q->ni_line--;
491 				/* this shouldn't be necessary */
492 				q->ni_flags |= NIF_LACHG|NIF_FACHG;
493 			}
494 		lastrow--;
495 		q = TAILQ_NEXT(p, chain);
496 		TAILQ_REMOVE(&netcb, p, chain);
497 		free(p);
498 		p = q;
499 	}
500 	/*
501 	 * Update existing connections and add new ones.
502 	 */
503 	TAILQ_FOREACH(p, &netcb, chain) {
504 		if (p->ni_line == -1) {
505 			/*
506 			 * Add a new entry if possible.
507 			 */
508 			if (lastrow > YMAX(wnd))
509 				continue;
510 			p->ni_line = lastrow++;
511 			p->ni_flags |= NIF_LACHG|NIF_FACHG;
512 		}
513 		if (p->ni_flags & NIF_LACHG) {
514 			wmove(wnd, p->ni_line, LADDR);
515 			inetprint((struct sockaddr *)&p->ni_lsa, p->ni_proto);
516 			p->ni_flags &= ~NIF_LACHG;
517 		}
518 		if (p->ni_flags & NIF_FACHG) {
519 			wmove(wnd, p->ni_line, FADDR);
520 			inetprint((struct sockaddr *)&p->ni_fsa, p->ni_proto);
521 			p->ni_flags &= ~NIF_FACHG;
522 		}
523 #ifdef INET6
524 		family = (p->ni_lsa.ss_family == AF_INET) ? "4" : "6";
525 #endif
526 		snprintf(proto, sizeof(proto), "%s%s", p->ni_proto, family);
527 		mvwaddstr(wnd, p->ni_line, PROTO, proto);
528 		mvwprintw(wnd, p->ni_line, RCVCC, "%6u", p->ni_rcvcc);
529 		mvwprintw(wnd, p->ni_line, SNDCC, "%6u", p->ni_sndcc);
530 		if (streq(p->ni_proto, "tcp")) {
531 			if (p->ni_state < 0 || p->ni_state >= TCP_NSTATES)
532 				mvwprintw(wnd, p->ni_line, STATE, "%d",
533 				    p->ni_state);
534 			else
535 				mvwaddstr(wnd, p->ni_line, STATE,
536 				    tcpstates[p->ni_state]);
537 		}
538 		wclrtoeol(wnd);
539 	}
540 	if (lastrow < YMAX(wnd)) {
541 		wmove(wnd, lastrow, 0); wclrtobot(wnd);
542 		wmove(wnd, YMAX(wnd), 0); wdeleteln(wnd);	/* XXX */
543 	}
544 }
545 
546 /*
547  * Pretty print an Internet address (net address + port).
548  * If the nflag was specified, use numbers instead of names.
549  */
550 static void
551 inetprint(sa, proto)
552 	struct sockaddr *sa;
553 	const char *proto;
554 {
555 	struct servent *sp = 0;
556 	char line[80], *cp;
557 	int port;
558 
559 	switch (sa->sa_family) {
560 	case AF_INET:
561 		port = ((struct sockaddr_in *)sa)->sin_port;
562 		break;
563 #ifdef INET6
564 	case AF_INET6:
565 		port = ((struct sockaddr_in6 *)sa)->sin6_port;
566 		break;
567 #endif
568 	default:
569 		port = 0;
570 		break;
571 	}
572 	snprintf(line, sizeof(line), "%.*s.", 16, inetname(sa));
573 	cp = index(line, '\0');
574 	if (!nflag && port)
575 		sp = getservbyport(port, proto);
576 	if (sp || port == 0)
577 		snprintf(cp, sizeof(line) - (cp - line), "%.8s",
578 		    sp ? sp->s_name : "*");
579 	else
580 		snprintf(cp, sizeof(line) - (cp - line), "%d",
581 		    ntohs((u_short)port));
582 	/* pad to full column to clear any garbage */
583 	cp = index(line, '\0');
584 	while (cp - line < 22)
585 		*cp++ = ' ';
586 	line[22] = '\0';
587 	waddstr(wnd, line);
588 }
589 
590 /*
591  * Construct an Internet address representation.
592  * If the nflag has been supplied, give
593  * numeric value, otherwise try for symbolic name.
594  */
595 static char *
596 inetname(sa)
597 	struct sockaddr *sa;
598 {
599 	char *cp = 0;
600 	static char line[NI_MAXHOST];
601 	struct hostent *hp;
602 	struct netent *np;
603 	struct in_addr in;
604 
605 #ifdef INET6
606 	if (sa->sa_family == AF_INET6) {
607 		if (memcmp(&((struct sockaddr_in6 *)sa)->sin6_addr,
608 		    &in6addr_any, sizeof(in6addr_any)) == 0)
609 			strcpy(line, "*");
610 		else
611 			getnameinfo(sa, sa->sa_len, line, sizeof(line), NULL, 0,
612 			    nflag ? NI_NUMERICHOST : 0);
613 		return (line);
614 	}
615 #endif
616 
617 	in = ((struct sockaddr_in *)sa)->sin_addr;
618 	if (!nflag && in.s_addr != INADDR_ANY) {
619 		int net = inet_netof(in);
620 		int lna = inet_lnaof(in);
621 
622 		if (lna == INADDR_ANY) {
623 			np = getnetbyaddr(net, AF_INET);
624 			if (np)
625 				cp = np->n_name;
626 		}
627 		if (cp == 0) {
628 			hp = gethostbyaddr((char *)&in, sizeof (in), AF_INET);
629 			if (hp)
630 				cp = hp->h_name;
631 		}
632 	}
633 	if (in.s_addr == INADDR_ANY)
634 		strcpy(line, "*");
635 	else if (cp)
636 		snprintf(line, sizeof(line), "%s", cp);
637 	else {
638 		in.s_addr = ntohl(in.s_addr);
639 #define C(x)	((x) & 0xff)
640 		snprintf(line, sizeof(line), "%u.%u.%u.%u", C(in.s_addr >> 24),
641 			C(in.s_addr >> 16), C(in.s_addr >> 8), C(in.s_addr));
642 	}
643 	return (line);
644 }
645 
646 int
647 cmdnetstat(cmd, args)
648 	const char *cmd, *args;
649 {
650 	if (prefix(cmd, "all")) {
651 		aflag = !aflag;
652 		goto fixup;
653 	}
654 	if  (prefix(cmd, "numbers") || prefix(cmd, "names")) {
655 		struct netinfo *p;
656 		int new;
657 
658 		new = prefix(cmd, "numbers");
659 		if (new == nflag)
660 			return (1);
661 		TAILQ_FOREACH(p, &netcb, chain) {
662 			if (p->ni_line == -1)
663 				continue;
664 			p->ni_flags |= NIF_LACHG|NIF_FACHG;
665 		}
666 		nflag = new;
667 		goto redisplay;
668 	}
669 	if (!netcmd(cmd, args))
670 		return (0);
671 fixup:
672 	fetchnetstat();
673 redisplay:
674 	shownetstat();
675 	refresh();
676 	return (1);
677 }
678