xref: /freebsd/usr.bin/systat/netstat.c (revision 9336e0699bda8a301cd2bfa37106b6ec5e32012e) 
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 static char tcb[] = "tcb", udb[] = "udb";
150 
151 struct nlist namelist[] = {
152 #define	X_TCB	0
153 	{ .n_name = tcb },
154 #define	X_UDB	1
155 	{ .n_name = udb },
156 	{ .n_name = NULL },
157 };
158 
159 int
160 initnetstat()
161 {
162 	protos = TCP|UDP;
163 	return(1);
164 }
165 
166 void
167 fetchnetstat()
168 {
169 	if (use_kvm)
170 		fetchnetstat_kvm();
171 	else
172 		fetchnetstat_sysctl();
173 }
174 
175 static void
176 fetchnetstat_kvm()
177 {
178 	struct inpcb *next;
179 	struct netinfo *p;
180 	struct inpcbhead head;
181 	struct inpcb inpcb;
182 	struct socket sockb;
183 	struct tcpcb tcpcb;
184 	void *off;
185 	int istcp;
186 
187 	if (namelist[X_TCB].n_value == 0)
188 		return;
189 	TAILQ_FOREACH(p, &netcb, chain)
190 		p->ni_seen = 0;
191 	if (protos&TCP) {
192 		off = NPTR(X_TCB);
193 		istcp = 1;
194 	}
195 	else if (protos&UDP) {
196 		off = NPTR(X_UDB);
197 		istcp = 0;
198 	}
199 	else {
200 		error("No protocols to display");
201 		return;
202 	}
203 again:
204 	KREAD(off, &head, sizeof (struct inpcbhead));
205 	LIST_FOREACH(next, &head, inp_list) {
206 		KREAD(next, &inpcb, sizeof (inpcb));
207 		next = &inpcb;
208 		if (!aflag) {
209 			if (inpcb.inp_vflag & INP_IPV4) {
210 				if (inet_lnaof(inpcb.inp_laddr) == INADDR_ANY)
211 					continue;
212 			}
213 #ifdef INET6
214 			else if (inpcb.inp_vflag & INP_IPV6) {
215 				if (memcmp(&inpcb.in6p_laddr,
216 				    &in6addr_any, sizeof(in6addr_any)) == 0)
217 					continue;
218 			}
219 #endif
220 		}
221 		if (nhosts && !checkhost(&inpcb))
222 			continue;
223 		if (nports && !checkport(&inpcb))
224 			continue;
225 		if (istcp) {
226 			if (inpcb.inp_vflag & INP_TIMEWAIT) {
227 				bzero(&sockb, sizeof(sockb));
228 				enter_kvm(&inpcb, &sockb, TCPS_TIME_WAIT,
229 					 "tcp");
230 			} else {
231 				KREAD(inpcb.inp_socket, &sockb,
232 					sizeof (sockb));
233 				KREAD(inpcb.inp_ppcb, &tcpcb, sizeof (tcpcb));
234 				enter_kvm(&inpcb, &sockb, tcpcb.t_state,
235 					"tcp");
236 			}
237 		} else
238 			enter_kvm(&inpcb, &sockb, 0, "udp");
239 	}
240 	if (istcp && (protos&UDP)) {
241 		istcp = 0;
242 		off = NPTR(X_UDB);
243 		goto again;
244 	}
245 }
246 
247 static void
248 fetchnetstat_sysctl()
249 {
250 	struct netinfo *p;
251 	int idx;
252 	struct xinpgen *inpg;
253 	char *cur, *end;
254 	struct inpcb *inpcb;
255 	struct xinpcb *xip = NULL;
256 	struct xtcpcb *xtp = NULL;
257 	int plen;
258 	size_t lsz;
259 
260 	TAILQ_FOREACH(p, &netcb, chain)
261 		p->ni_seen = 0;
262 	if (protos&TCP) {
263 		idx = 0;
264 	} else if (protos&UDP) {
265 		idx = 1;
266 	} else {
267 		error("No protocols to display");
268 		return;
269 	}
270 
271 	for (;idx < 2; idx++) {
272 		if (idx == 1 && !(protos&UDP))
273 			break;
274 		inpg = (struct xinpgen *)sysctl_dynread(miblist[idx], &lsz);
275 		if (inpg == NULL) {
276 			error("sysctl(%s...) failed", miblist[idx]);
277 			continue;
278 		}
279 		/*
280 		 * We currently do no require a consistent pcb list.
281 		 * Try to be robust in case of struct size changes
282 		 */
283 		cur = ((char *)inpg) + inpg->xig_len;
284 		/* There is also a trailing struct xinpgen */
285 		end = ((char *)inpg) + lsz - inpg->xig_len;
286 		if (end <= cur) {
287 			free(inpg);
288 			continue;
289 		}
290 		if (idx == 0) { /* TCP */
291 			xtp = (struct xtcpcb *)cur;
292 			plen = xtp->xt_len;
293 		} else {
294 			xip = (struct xinpcb *)cur;
295 			plen = xip->xi_len;
296 		}
297 		while (cur + plen <= end) {
298 			if (idx == 0) { /* TCP */
299 				xtp = (struct xtcpcb *)cur;
300 				inpcb = &xtp->xt_inp;
301 			} else {
302 				xip = (struct xinpcb *)cur;
303 				inpcb = &xip->xi_inp;
304 			}
305 			cur += plen;
306 
307 			if (!aflag) {
308 				if (inpcb->inp_vflag & INP_IPV4) {
309 					if (inet_lnaof(inpcb->inp_laddr) ==
310 					    INADDR_ANY)
311 						continue;
312 				}
313 #ifdef INET6
314 				else if (inpcb->inp_vflag & INP_IPV6) {
315 					if (memcmp(&inpcb->in6p_laddr,
316 					    &in6addr_any, sizeof(in6addr_any))
317 					    == 0)
318 						continue;
319 				}
320 #endif
321 			}
322 			if (nhosts && !checkhost(inpcb))
323 				continue;
324 			if (nports && !checkport(inpcb))
325 				continue;
326 			if (idx == 0)	/* TCP */
327 				enter_sysctl(inpcb, &xtp->xt_socket,
328 				    xtp->xt_tp.t_state, "tcp");
329 			else		/* UDP */
330 				enter_sysctl(inpcb, &xip->xi_socket, 0, "udp");
331 		}
332 		free(inpg);
333 	}
334 }
335 
336 static void
337 enter_kvm(inp, so, state, proto)
338 	struct inpcb *inp;
339 	struct socket *so;
340 	int state;
341 	const char *proto;
342 {
343 	struct netinfo *p;
344 
345 	if ((p = enter(inp, state, proto)) != NULL) {
346 		p->ni_rcvcc = so->so_rcv.sb_cc;
347 		p->ni_sndcc = so->so_snd.sb_cc;
348 	}
349 }
350 
351 static void
352 enter_sysctl(inp, so, state, proto)
353 	struct inpcb *inp;
354 	struct xsocket *so;
355 	int state;
356 	const char *proto;
357 {
358 	struct netinfo *p;
359 
360 	if ((p = enter(inp, state, proto)) != NULL) {
361 		p->ni_rcvcc = so->so_rcv.sb_cc;
362 		p->ni_sndcc = so->so_snd.sb_cc;
363 	}
364 }
365 
366 
367 static struct netinfo *
368 enter(inp, state, proto)
369 	struct inpcb *inp;
370 	int state;
371 	const char *proto;
372 {
373 	struct netinfo *p;
374 	struct sockaddr_storage lsa, fsa;
375 	struct sockaddr_in *sa4;
376 #ifdef INET6
377 	struct sockaddr_in6 *sa6;
378 #endif
379 
380 	memset(&lsa, 0, sizeof(lsa));
381 	memset(&fsa, 0, sizeof(fsa));
382 	if (inp->inp_vflag & INP_IPV4) {
383 		sa4 = (struct sockaddr_in *)&lsa;
384 		sa4->sin_addr = inp->inp_laddr;
385 		sa4->sin_port = inp->inp_lport;
386 		sa4->sin_family = AF_INET;
387 		sa4->sin_len = sizeof(struct sockaddr_in);
388 
389 		sa4 = (struct sockaddr_in *)&fsa;
390 		sa4->sin_addr = inp->inp_faddr;
391 		sa4->sin_port = inp->inp_fport;
392 		sa4->sin_family = AF_INET;
393 		sa4->sin_len = sizeof(struct sockaddr_in);
394 	}
395 #ifdef INET6
396 	else if (inp->inp_vflag & INP_IPV6) {
397 		sa6 = (struct sockaddr_in6 *)&lsa;
398 		memcpy(&sa6->sin6_addr, &inp->in6p_laddr,
399 		    sizeof(struct in6_addr));
400 		sa6->sin6_port = inp->inp_lport;
401 		sa6->sin6_family = AF_INET6;
402 		sa6->sin6_len = sizeof(struct sockaddr_in6);
403 
404 		sa6 = (struct sockaddr_in6 *)&fsa;
405 		memcpy(&sa6->sin6_addr, &inp->in6p_faddr,
406 		    sizeof(struct in6_addr));
407 		sa6->sin6_port = inp->inp_fport;
408 		sa6->sin6_family = AF_INET6;
409 		sa6->sin6_len = sizeof(struct sockaddr_in6);
410 	}
411 #endif
412 	else
413 		return NULL;
414 
415 	/*
416 	 * Only take exact matches, any sockets with
417 	 * previously unbound addresses will be deleted
418 	 * below in the display routine because they
419 	 * will appear as ``not seen'' in the kernel
420 	 * data structures.
421 	 */
422 	TAILQ_FOREACH(p, &netcb, chain) {
423 		if (!streq(proto, p->ni_proto))
424 			continue;
425 		if (p->ni_lsa.ss_family != lsa.ss_family ||
426 		    memcmp(&p->ni_lsa, &lsa, lsa.ss_len) != 0)
427 			continue;
428 		if (p->ni_fsa.ss_family == fsa.ss_family &&
429 		    memcmp(&p->ni_fsa, &fsa, fsa.ss_len) == 0)
430 			break;
431 	}
432 	if (p == NULL) {
433 		if ((p = malloc(sizeof(*p))) == NULL) {
434 			error("Out of memory");
435 			return NULL;
436 		}
437 		TAILQ_INSERT_HEAD(&netcb, p, chain);
438 		p->ni_line = -1;
439 		memcpy(&p->ni_lsa, &lsa, lsa.ss_len);
440 		memcpy(&p->ni_fsa, &fsa, fsa.ss_len);
441 		p->ni_proto = strdup(proto);
442 		p->ni_flags = NIF_LACHG|NIF_FACHG;
443 	}
444 	p->ni_state = state;
445 	p->ni_seen = 1;
446 	return p;
447 }
448 
449 /* column locations */
450 #define	LADDR	0
451 #define	FADDR	LADDR+23
452 #define	PROTO	FADDR+23
453 #define	RCVCC	PROTO+6
454 #define	SNDCC	RCVCC+7
455 #define	STATE	SNDCC+7
456 
457 
458 void
459 labelnetstat()
460 {
461 	if (use_kvm && namelist[X_TCB].n_type == 0)
462 		return;
463 	wmove(wnd, 0, 0); wclrtobot(wnd);
464 	mvwaddstr(wnd, 0, LADDR, "Local Address");
465 	mvwaddstr(wnd, 0, FADDR, "Foreign Address");
466 	mvwaddstr(wnd, 0, PROTO, "Proto");
467 	mvwaddstr(wnd, 0, RCVCC, "Recv-Q");
468 	mvwaddstr(wnd, 0, SNDCC, "Send-Q");
469 	mvwaddstr(wnd, 0, STATE, "(state)");
470 }
471 
472 void
473 shownetstat()
474 {
475 	struct netinfo *p, *q;
476 	char proto[6];
477 	const char *family = "";
478 
479 	/*
480 	 * First, delete any connections that have gone
481 	 * away and adjust the position of connections
482 	 * below to reflect the deleted line.
483 	 */
484 	p = TAILQ_FIRST(&netcb);
485 	while (p != NULL) {
486 		if (p->ni_line == -1 || p->ni_seen) {
487 			p = TAILQ_NEXT(p, chain);
488 			continue;
489 		}
490 		wmove(wnd, p->ni_line, 0); wdeleteln(wnd);
491 		TAILQ_FOREACH(q, &netcb, chain)
492 			if (q != p && q->ni_line > p->ni_line) {
493 				q->ni_line--;
494 				/* this shouldn't be necessary */
495 				q->ni_flags |= NIF_LACHG|NIF_FACHG;
496 			}
497 		lastrow--;
498 		q = TAILQ_NEXT(p, chain);
499 		TAILQ_REMOVE(&netcb, p, chain);
500 		free(p);
501 		p = q;
502 	}
503 	/*
504 	 * Update existing connections and add new ones.
505 	 */
506 	TAILQ_FOREACH(p, &netcb, chain) {
507 		if (p->ni_line == -1) {
508 			/*
509 			 * Add a new entry if possible.
510 			 */
511 			if (lastrow > YMAX(wnd))
512 				continue;
513 			p->ni_line = lastrow++;
514 			p->ni_flags |= NIF_LACHG|NIF_FACHG;
515 		}
516 		if (p->ni_flags & NIF_LACHG) {
517 			wmove(wnd, p->ni_line, LADDR);
518 			inetprint((struct sockaddr *)&p->ni_lsa, p->ni_proto);
519 			p->ni_flags &= ~NIF_LACHG;
520 		}
521 		if (p->ni_flags & NIF_FACHG) {
522 			wmove(wnd, p->ni_line, FADDR);
523 			inetprint((struct sockaddr *)&p->ni_fsa, p->ni_proto);
524 			p->ni_flags &= ~NIF_FACHG;
525 		}
526 #ifdef INET6
527 		family = (p->ni_lsa.ss_family == AF_INET) ? "4" : "6";
528 #endif
529 		snprintf(proto, sizeof(proto), "%s%s", p->ni_proto, family);
530 		mvwaddstr(wnd, p->ni_line, PROTO, proto);
531 		mvwprintw(wnd, p->ni_line, RCVCC, "%6u", p->ni_rcvcc);
532 		mvwprintw(wnd, p->ni_line, SNDCC, "%6u", p->ni_sndcc);
533 		if (streq(p->ni_proto, "tcp")) {
534 			if (p->ni_state < 0 || p->ni_state >= TCP_NSTATES)
535 				mvwprintw(wnd, p->ni_line, STATE, "%d",
536 				    p->ni_state);
537 			else
538 				mvwaddstr(wnd, p->ni_line, STATE,
539 				    tcpstates[p->ni_state]);
540 		}
541 		wclrtoeol(wnd);
542 	}
543 	if (lastrow < YMAX(wnd)) {
544 		wmove(wnd, lastrow, 0); wclrtobot(wnd);
545 		wmove(wnd, YMAX(wnd), 0); wdeleteln(wnd);	/* XXX */
546 	}
547 }
548 
549 /*
550  * Pretty print an Internet address (net address + port).
551  * If the nflag was specified, use numbers instead of names.
552  */
553 static void
554 inetprint(sa, proto)
555 	struct sockaddr *sa;
556 	const char *proto;
557 {
558 	struct servent *sp = 0;
559 	char line[80], *cp;
560 	int port;
561 
562 	switch (sa->sa_family) {
563 	case AF_INET:
564 		port = ((struct sockaddr_in *)sa)->sin_port;
565 		break;
566 #ifdef INET6
567 	case AF_INET6:
568 		port = ((struct sockaddr_in6 *)sa)->sin6_port;
569 		break;
570 #endif
571 	default:
572 		port = 0;
573 		break;
574 	}
575 	snprintf(line, sizeof(line), "%.*s.", 16, inetname(sa));
576 	cp = index(line, '\0');
577 	if (!nflag && port)
578 		sp = getservbyport(port, proto);
579 	if (sp || port == 0)
580 		snprintf(cp, sizeof(line) - (cp - line), "%.8s",
581 		    sp ? sp->s_name : "*");
582 	else
583 		snprintf(cp, sizeof(line) - (cp - line), "%d",
584 		    ntohs((u_short)port));
585 	/* pad to full column to clear any garbage */
586 	cp = index(line, '\0');
587 	while (cp - line < 22)
588 		*cp++ = ' ';
589 	line[22] = '\0';
590 	waddstr(wnd, line);
591 }
592 
593 /*
594  * Construct an Internet address representation.
595  * If the nflag has been supplied, give
596  * numeric value, otherwise try for symbolic name.
597  */
598 static char *
599 inetname(sa)
600 	struct sockaddr *sa;
601 {
602 	char *cp = 0;
603 	static char line[NI_MAXHOST];
604 	struct hostent *hp;
605 	struct netent *np;
606 	struct in_addr in;
607 
608 #ifdef INET6
609 	if (sa->sa_family == AF_INET6) {
610 		if (memcmp(&((struct sockaddr_in6 *)sa)->sin6_addr,
611 		    &in6addr_any, sizeof(in6addr_any)) == 0)
612 			strcpy(line, "*");
613 		else
614 			getnameinfo(sa, sa->sa_len, line, sizeof(line), NULL, 0,
615 			    nflag ? NI_NUMERICHOST : 0);
616 		return (line);
617 	}
618 #endif
619 
620 	in = ((struct sockaddr_in *)sa)->sin_addr;
621 	if (!nflag && in.s_addr != INADDR_ANY) {
622 		int net = inet_netof(in);
623 		int lna = inet_lnaof(in);
624 
625 		if (lna == INADDR_ANY) {
626 			np = getnetbyaddr(net, AF_INET);
627 			if (np)
628 				cp = np->n_name;
629 		}
630 		if (cp == 0) {
631 			hp = gethostbyaddr((char *)&in, sizeof (in), AF_INET);
632 			if (hp)
633 				cp = hp->h_name;
634 		}
635 	}
636 	if (in.s_addr == INADDR_ANY)
637 		strcpy(line, "*");
638 	else if (cp)
639 		snprintf(line, sizeof(line), "%s", cp);
640 	else {
641 		in.s_addr = ntohl(in.s_addr);
642 #define C(x)	((x) & 0xff)
643 		snprintf(line, sizeof(line), "%u.%u.%u.%u", C(in.s_addr >> 24),
644 			C(in.s_addr >> 16), C(in.s_addr >> 8), C(in.s_addr));
645 	}
646 	return (line);
647 }
648 
649 int
650 cmdnetstat(cmd, args)
651 	const char *cmd, *args;
652 {
653 	if (prefix(cmd, "all")) {
654 		aflag = !aflag;
655 		goto fixup;
656 	}
657 	if  (prefix(cmd, "numbers") || prefix(cmd, "names")) {
658 		struct netinfo *p;
659 		int new;
660 
661 		new = prefix(cmd, "numbers");
662 		if (new == nflag)
663 			return (1);
664 		TAILQ_FOREACH(p, &netcb, chain) {
665 			if (p->ni_line == -1)
666 				continue;
667 			p->ni_flags |= NIF_LACHG|NIF_FACHG;
668 		}
669 		nflag = new;
670 		goto redisplay;
671 	}
672 	if (!netcmd(cmd, args))
673 		return (0);
674 fixup:
675 	fetchnetstat();
676 redisplay:
677 	shownetstat();
678 	refresh();
679 	return (1);
680 }
681