xref: /original-bsd/sys/net/if.c (revision 6093a5ae)
1 /*
2  * Copyright (c) 1980, 1986 Regents of the University of California.
3  * All rights reserved.
4  *
5  * %sccs.include.redist.c%
6  *
7  *	@(#)if.c	7.21 (Berkeley) 07/07/92
8  */
9 
10 #include "param.h"
11 #include "mbuf.h"
12 #include "systm.h"
13 #include "proc.h"
14 #include "socket.h"
15 #include "socketvar.h"
16 #include "protosw.h"
17 #include "kernel.h"
18 #include "ioctl.h"
19 
20 #include "if.h"
21 #include "af.h"
22 #include "if_dl.h"
23 #include "if_types.h"
24 
25 #include "ether.h"
26 
27 int	ifqmaxlen = IFQ_MAXLEN;
28 void	if_slowtimo __P((void *arg));
29 
30 /*
31  * Network interface utility routines.
32  *
33  * Routines with ifa_ifwith* names take sockaddr *'s as
34  * parameters.
35  */
36 
37 ifinit()
38 {
39 	register struct ifnet *ifp;
40 
41 	for (ifp = ifnet; ifp; ifp = ifp->if_next)
42 		if (ifp->if_snd.ifq_maxlen == 0)
43 			ifp->if_snd.ifq_maxlen = ifqmaxlen;
44 	if_slowtimo(0);
45 }
46 
47 #ifdef vax
48 /*
49  * Call each interface on a Unibus reset.
50  */
51 ifubareset(uban)
52 	int uban;
53 {
54 	register struct ifnet *ifp;
55 
56 	for (ifp = ifnet; ifp; ifp = ifp->if_next)
57 		if (ifp->if_reset)
58 			(*ifp->if_reset)(ifp->if_unit, uban);
59 }
60 #endif
61 
62 int if_index = 0;
63 struct ifaddr **ifnet_addrs;
64 static char *sprint_d();
65 
66 /*
67  * Attach an interface to the
68  * list of "active" interfaces.
69  */
70 void
71 if_attach(ifp)
72 	struct ifnet *ifp;
73 {
74 	unsigned socksize, ifasize;
75 	int namelen, unitlen, masklen, ether_output();
76 	char workbuf[12], *unitname;
77 	register struct ifnet **p = &ifnet;
78 	register struct sockaddr_dl *sdl;
79 	register struct ifaddr *ifa;
80 	static int if_indexlim = 8;
81 	extern void link_rtrequest();
82 
83 	while (*p)
84 		p = &((*p)->if_next);
85 	*p = ifp;
86 	ifp->if_index = ++if_index;
87 	if (ifnet_addrs == 0 || if_index >= if_indexlim) {
88 		unsigned n = (if_indexlim <<= 1) * sizeof(ifa);
89 		struct ifaddr **q = (struct ifaddr **)
90 					malloc(n, M_IFADDR, M_WAITOK);
91 		if (ifnet_addrs) {
92 			bcopy((caddr_t)ifnet_addrs, (caddr_t)q, n/2);
93 			free((caddr_t)ifnet_addrs, M_IFADDR);
94 		}
95 		ifnet_addrs = q;
96 	}
97 	/*
98 	 * create a Link Level name for this device
99 	 */
100 	unitname = sprint_d((u_int)ifp->if_unit, workbuf, sizeof(workbuf));
101 	namelen = strlen(ifp->if_name);
102 	unitlen = strlen(unitname);
103 #define _offsetof(t, m) ((int)((caddr_t)&((t *)0)->m))
104 	masklen = _offsetof(struct sockaddr_dl, sdl_data[0]) +
105 			       unitlen + namelen;
106 	socksize = masklen + ifp->if_addrlen;
107 #define ROUNDUP(a) (1 + (((a) - 1) | (sizeof(long) - 1)))
108 	socksize = ROUNDUP(socksize);
109 	if (socksize < sizeof(*sdl))
110 		socksize = sizeof(*sdl);
111 	ifasize = sizeof(*ifa) + 2 * socksize;
112 	if (ifa = (struct ifaddr *)malloc(ifasize, M_IFADDR, M_WAITOK)) {
113 		bzero((caddr_t)ifa, ifasize);
114 		sdl = (struct sockaddr_dl *)(ifa + 1);
115 		sdl->sdl_len = socksize;
116 		sdl->sdl_family = AF_LINK;
117 		bcopy(ifp->if_name, sdl->sdl_data, namelen);
118 		bcopy(unitname, namelen + (caddr_t)sdl->sdl_data, unitlen);
119 		sdl->sdl_nlen = (namelen += unitlen);
120 		sdl->sdl_index = ifp->if_index;
121 		sdl->sdl_type = ifp->if_type;
122 		ifnet_addrs[if_index - 1] = ifa;
123 		ifa->ifa_ifp = ifp;
124 		ifa->ifa_next = ifp->if_addrlist;
125 		ifa->ifa_rtrequest = link_rtrequest;
126 		ifp->if_addrlist = ifa;
127 		ifa->ifa_addr = (struct sockaddr *)sdl;
128 		sdl = (struct sockaddr_dl *)(socksize + (caddr_t)sdl);
129 		ifa->ifa_netmask = (struct sockaddr *)sdl;
130 		sdl->sdl_len = masklen;
131 		while (namelen != 0)
132 			sdl->sdl_data[--namelen] = 0xff;
133 	}
134 	/* XXX -- Temporary fix before changing 10 ethernet drivers */
135 	if (ifp->if_output == ether_output)
136 		ether_ifattach(ifp);
137 }
138 /*
139  * Locate an interface based on a complete address.
140  */
141 /*ARGSUSED*/
142 struct ifaddr *
143 ifa_ifwithaddr(addr)
144 	register struct sockaddr *addr;
145 {
146 	register struct ifnet *ifp;
147 	register struct ifaddr *ifa;
148 
149 #define	equal(a1, a2) \
150   (bcmp((caddr_t)(a1), (caddr_t)(a2), ((struct sockaddr *)(a1))->sa_len) == 0)
151 	for (ifp = ifnet; ifp; ifp = ifp->if_next)
152 	    for (ifa = ifp->if_addrlist; ifa; ifa = ifa->ifa_next) {
153 		if (ifa->ifa_addr->sa_family != addr->sa_family)
154 			continue;
155 		if (equal(addr, ifa->ifa_addr))
156 			return (ifa);
157 		if ((ifp->if_flags & IFF_BROADCAST) && ifa->ifa_broadaddr &&
158 		    equal(ifa->ifa_broadaddr, addr))
159 			return (ifa);
160 	}
161 	return ((struct ifaddr *)0);
162 }
163 /*
164  * Locate the point to point interface with a given destination address.
165  */
166 /*ARGSUSED*/
167 struct ifaddr *
168 ifa_ifwithdstaddr(addr)
169 	register struct sockaddr *addr;
170 {
171 	register struct ifnet *ifp;
172 	register struct ifaddr *ifa;
173 
174 	for (ifp = ifnet; ifp; ifp = ifp->if_next)
175 	    if (ifp->if_flags & IFF_POINTOPOINT)
176 		for (ifa = ifp->if_addrlist; ifa; ifa = ifa->ifa_next) {
177 			if (ifa->ifa_addr->sa_family != addr->sa_family)
178 				continue;
179 			if (equal(addr, ifa->ifa_dstaddr))
180 				return (ifa);
181 	}
182 	return ((struct ifaddr *)0);
183 }
184 
185 /*
186  * Find an interface on a specific network.  If many, choice
187  * is most specific found.
188  */
189 struct ifaddr *
190 ifa_ifwithnet(addr)
191 	struct sockaddr *addr;
192 {
193 	register struct ifnet *ifp;
194 	register struct ifaddr *ifa;
195 	struct ifaddr *ifa_maybe = (struct ifaddr *) 0;
196 	u_int af = addr->sa_family;
197 	char *addr_data = addr->sa_data, *cplim;
198 
199 	if (af == AF_LINK) {
200 	    register struct sockaddr_dl *sdl = (struct sockaddr_dl *)addr;
201 	    if (sdl->sdl_index && sdl->sdl_index <= if_index)
202 		return (ifnet_addrs[sdl->sdl_index - 1]);
203 	}
204 	for (ifp = ifnet; ifp; ifp = ifp->if_next)
205 	    for (ifa = ifp->if_addrlist; ifa; ifa = ifa->ifa_next) {
206 		register char *cp, *cp2, *cp3;
207 
208 		if (ifa->ifa_addr->sa_family != af || ifa->ifa_netmask == 0)
209 			next: continue;
210 		cp = addr_data;
211 		cp2 = ifa->ifa_addr->sa_data;
212 		cp3 = ifa->ifa_netmask->sa_data;
213 		cplim = ifa->ifa_netmask->sa_len + (char *)ifa->ifa_netmask;
214 		while (cp3 < cplim)
215 			if ((*cp++ ^ *cp2++) & *cp3++)
216 				goto next;
217 		if (ifa_maybe == 0 ||
218 		    rn_refines(ifa->ifa_netmask, ifa_maybe->ifa_netmask))
219 			ifa_maybe = ifa;
220 	    }
221 	return (ifa_maybe);
222 }
223 
224 /*
225  * Find an interface using a specific address family
226  */
227 struct ifaddr *
228 ifa_ifwithaf(af)
229 	register int af;
230 {
231 	register struct ifnet *ifp;
232 	register struct ifaddr *ifa;
233 
234 	for (ifp = ifnet; ifp; ifp = ifp->if_next)
235 	    for (ifa = ifp->if_addrlist; ifa; ifa = ifa->ifa_next)
236 		if (ifa->ifa_addr->sa_family == af)
237 			return (ifa);
238 	return ((struct ifaddr *)0);
239 }
240 
241 /*
242  * Find an interface address specific to an interface best matching
243  * a given address.
244  */
245 struct ifaddr *
246 ifaof_ifpforaddr(addr, ifp)
247 	struct sockaddr *addr;
248 	register struct ifnet *ifp;
249 {
250 	register struct ifaddr *ifa;
251 	register char *cp, *cp2, *cp3;
252 	register char *cplim;
253 	struct ifaddr *ifa_maybe = 0;
254 	u_int af = addr->sa_family;
255 
256 	if (af >= AF_MAX)
257 		return (0);
258 	for (ifa = ifp->if_addrlist; ifa; ifa = ifa->ifa_next) {
259 		if (ifa->ifa_addr->sa_family != af)
260 			continue;
261 		ifa_maybe = ifa;
262 		if (ifa->ifa_netmask == 0) {
263 			if (equal(addr, ifa->ifa_addr) ||
264 			    (ifa->ifa_dstaddr && equal(addr, ifa->ifa_dstaddr)))
265 				return (ifa);
266 			continue;
267 		}
268 		cp = addr->sa_data;
269 		cp2 = ifa->ifa_addr->sa_data;
270 		cp3 = ifa->ifa_netmask->sa_data;
271 		cplim = ifa->ifa_netmask->sa_len + (char *)ifa->ifa_netmask;
272 		for (; cp3 < cplim; cp3++)
273 			if ((*cp++ ^ *cp2++) & *cp3)
274 				break;
275 		if (cp3 == cplim)
276 			return (ifa);
277 	}
278 	return (ifa_maybe);
279 }
280 #include "route.h"
281 /*
282  * Default action when installing a route with a Link Level gateway.
283  * Lookup an appropriate real ifa to point to.
284  * This should be moved to /sys/net/link.c eventually.
285  */
286 void
287 link_rtrequest(cmd, rt, sa)
288 	int cmd;
289 	register struct rtentry *rt;
290 	struct sockaddr *sa;
291 {
292 	register struct ifaddr *ifa;
293 	struct sockaddr *dst;
294 	struct ifnet *ifp, *oldifnet = ifnet;
295 
296 	if (cmd != RTM_ADD || ((ifa = rt->rt_ifa) == 0) ||
297 	    ((ifp = ifa->ifa_ifp) == 0) || ((dst = rt_key(rt)) == 0))
298 		return;
299 	if (ifa = ifaof_ifpforaddr(dst, ifp)) {
300 		rt->rt_ifa = ifa;
301 		if (ifa->ifa_rtrequest && ifa->ifa_rtrequest != link_rtrequest)
302 			ifa->ifa_rtrequest(cmd, rt, sa);
303 	}
304 }
305 
306 /*
307  * Mark an interface down and notify protocols of
308  * the transition.
309  * NOTE: must be called at splnet or eqivalent.
310  */
311 if_down(ifp)
312 	register struct ifnet *ifp;
313 {
314 	register struct ifaddr *ifa;
315 
316 	ifp->if_flags &= ~IFF_UP;
317 	for (ifa = ifp->if_addrlist; ifa; ifa = ifa->ifa_next)
318 		pfctlinput(PRC_IFDOWN, ifa->ifa_addr);
319 	if_qflush(&ifp->if_snd);
320 	rt_ifmsg(ifp);
321 }
322 
323 /*
324  * Mark an interface up and notify protocols of
325  * the transition.
326  * NOTE: must be called at splnet or eqivalent.
327  */
328 if_up(ifp)
329 	register struct ifnet *ifp;
330 {
331 	register struct ifaddr *ifa;
332 
333 	ifp->if_flags |= IFF_UP;
334 #ifdef notyet
335 	/* this has no effect on IP, and will kill all iso connections XXX */
336 	for (ifa = ifp->if_addrlist; ifa; ifa = ifa->ifa_next)
337 		pfctlinput(PRC_IFUP, ifa->ifa_addr);
338 #endif notyet
339 	rt_ifmsg(ifp);
340 }
341 
342 /*
343  * Flush an interface queue.
344  */
345 if_qflush(ifq)
346 	register struct ifqueue *ifq;
347 {
348 	register struct mbuf *m, *n;
349 
350 	n = ifq->ifq_head;
351 	while (m = n) {
352 		n = m->m_act;
353 		m_freem(m);
354 	}
355 	ifq->ifq_head = 0;
356 	ifq->ifq_tail = 0;
357 	ifq->ifq_len = 0;
358 }
359 
360 /*
361  * Handle interface watchdog timer routines.  Called
362  * from softclock, we decrement timers (if set) and
363  * call the appropriate interface routine on expiration.
364  */
365 void
366 if_slowtimo(arg)
367 	void *arg;
368 {
369 	register struct ifnet *ifp;
370 	int s = splimp();
371 
372 	for (ifp = ifnet; ifp; ifp = ifp->if_next) {
373 		if (ifp->if_timer == 0 || --ifp->if_timer)
374 			continue;
375 		if (ifp->if_watchdog)
376 			(*ifp->if_watchdog)(ifp->if_unit);
377 	}
378 	splx(s);
379 	timeout(if_slowtimo, (void *)0, hz / IFNET_SLOWHZ);
380 }
381 
382 /*
383  * Map interface name to
384  * interface structure pointer.
385  */
386 struct ifnet *
387 ifunit(name)
388 	register char *name;
389 {
390 	register char *cp;
391 	register struct ifnet *ifp;
392 	int unit;
393 	unsigned len;
394 	char *ep, c;
395 
396 	for (cp = name; cp < name + IFNAMSIZ && *cp; cp++)
397 		if (*cp >= '0' && *cp <= '9')
398 			break;
399 	if (*cp == '\0' || cp == name + IFNAMSIZ)
400 		return ((struct ifnet *)0);
401 	/*
402 	 * Save first char of unit, and pointer to it,
403 	 * so we can put a null there to avoid matching
404 	 * initial substrings of interface names.
405 	 */
406 	len = cp - name + 1;
407 	c = *cp;
408 	ep = cp;
409 	for (unit = 0; *cp >= '0' && *cp <= '9'; )
410 		unit = unit * 10 + *cp++ - '0';
411 	*ep = 0;
412 	for (ifp = ifnet; ifp; ifp = ifp->if_next) {
413 		if (bcmp(ifp->if_name, name, len))
414 			continue;
415 		if (unit == ifp->if_unit)
416 			break;
417 	}
418 	*ep = c;
419 	return (ifp);
420 }
421 
422 /*
423  * Interface ioctls.
424  */
425 ifioctl(so, cmd, data, p)
426 	struct socket *so;
427 	int cmd;
428 	caddr_t data;
429 	struct proc *p;
430 {
431 	register struct ifnet *ifp;
432 	register struct ifreq *ifr;
433 	int error;
434 
435 	switch (cmd) {
436 
437 	case SIOCGIFCONF:
438 	case OSIOCGIFCONF:
439 		return (ifconf(cmd, data));
440 
441 #if defined(INET) && NETHER > 0
442 	case SIOCSARP:
443 	case SIOCDARP:
444 		if (error = suser(p->p_ucred, &p->p_acflag))
445 			return (error);
446 		/* FALL THROUGH */
447 	case SIOCGARP:
448 	case OSIOCGARP:
449 		return (arpioctl(cmd, data));
450 #endif
451 	}
452 	ifr = (struct ifreq *)data;
453 	ifp = ifunit(ifr->ifr_name);
454 	if (ifp == 0)
455 		return (ENXIO);
456 	switch (cmd) {
457 
458 	case SIOCGIFFLAGS:
459 		ifr->ifr_flags = ifp->if_flags;
460 		break;
461 
462 	case SIOCGIFMETRIC:
463 		ifr->ifr_metric = ifp->if_metric;
464 		break;
465 
466 	case SIOCSIFFLAGS:
467 		if (error = suser(p->p_ucred, &p->p_acflag))
468 			return (error);
469 		if (ifp->if_flags & IFF_UP && (ifr->ifr_flags & IFF_UP) == 0) {
470 			int s = splimp();
471 			if_down(ifp);
472 			splx(s);
473 		}
474 		if (ifr->ifr_flags & IFF_UP && (ifp->if_flags & IFF_UP) == 0) {
475 			int s = splimp();
476 			if_up(ifp);
477 			splx(s);
478 		}
479 		ifp->if_flags = (ifp->if_flags & IFF_CANTCHANGE) |
480 			(ifr->ifr_flags &~ IFF_CANTCHANGE);
481 		if (ifp->if_ioctl)
482 			(void) (*ifp->if_ioctl)(ifp, cmd, data);
483 		break;
484 
485 	case SIOCSIFMETRIC:
486 		if (error = suser(p->p_ucred, &p->p_acflag))
487 			return (error);
488 		ifp->if_metric = ifr->ifr_metric;
489 		break;
490 
491 #ifdef MULTICAST
492 	case SIOCADDMULTI:
493 	case SIOCDELMULTI:
494 		if (error = suser(p->p_ucred, &p->p_acflag))
495 			return (error);
496 		if (ifp->if_ioctl)
497 			return (EOPNOTSUPP);
498 		return ((*ifp->if_ioctl)(ifp, cmd, data));
499 #endif
500 
501 	default:
502 		if (so->so_proto == 0)
503 			return (EOPNOTSUPP);
504 #ifndef COMPAT_43
505 		return ((*so->so_proto->pr_usrreq)(so, PRU_CONTROL,
506 			cmd, data, ifp));
507 #else
508 	    {
509 		int ocmd = cmd;
510 
511 		switch (cmd) {
512 
513 		case SIOCSIFDSTADDR:
514 		case SIOCSIFADDR:
515 		case SIOCSIFBRDADDR:
516 		case SIOCSIFNETMASK:
517 #if BYTE_ORDER != BIG_ENDIAN
518 			if (ifr->ifr_addr.sa_family == 0 &&
519 			    ifr->ifr_addr.sa_len < 16) {
520 				ifr->ifr_addr.sa_family = ifr->ifr_addr.sa_len;
521 				ifr->ifr_addr.sa_len = 16;
522 			}
523 #else
524 			if (ifr->ifr_addr.sa_len == 0)
525 				ifr->ifr_addr.sa_len = 16;
526 #endif
527 			break;
528 
529 		case OSIOCGIFADDR:
530 			cmd = SIOCGIFADDR;
531 			break;
532 
533 		case OSIOCGIFDSTADDR:
534 			cmd = SIOCGIFDSTADDR;
535 			break;
536 
537 		case OSIOCGIFBRDADDR:
538 			cmd = SIOCGIFBRDADDR;
539 			break;
540 
541 		case OSIOCGIFNETMASK:
542 			cmd = SIOCGIFNETMASK;
543 		}
544 		error =  ((*so->so_proto->pr_usrreq)(so, PRU_CONTROL,
545 							    cmd, data, ifp));
546 		switch (ocmd) {
547 
548 		case OSIOCGIFADDR:
549 		case OSIOCGIFDSTADDR:
550 		case OSIOCGIFBRDADDR:
551 		case OSIOCGIFNETMASK:
552 			*(u_short *)&ifr->ifr_addr = ifr->ifr_addr.sa_family;
553 		}
554 		return (error);
555 
556 	    }
557 #endif
558 	}
559 	return (0);
560 }
561 
562 /*
563  * Return interface configuration
564  * of system.  List may be used
565  * in later ioctl's (above) to get
566  * other information.
567  */
568 /*ARGSUSED*/
569 ifconf(cmd, data)
570 	int cmd;
571 	caddr_t data;
572 {
573 	register struct ifconf *ifc = (struct ifconf *)data;
574 	register struct ifnet *ifp = ifnet;
575 	register struct ifaddr *ifa;
576 	register char *cp, *ep;
577 	struct ifreq ifr, *ifrp;
578 	int space = ifc->ifc_len, error = 0;
579 
580 	ifrp = ifc->ifc_req;
581 	ep = ifr.ifr_name + sizeof (ifr.ifr_name) - 2;
582 	for (; space > sizeof (ifr) && ifp; ifp = ifp->if_next) {
583 		bcopy(ifp->if_name, ifr.ifr_name, sizeof (ifr.ifr_name) - 2);
584 		for (cp = ifr.ifr_name; cp < ep && *cp; cp++)
585 			continue;
586 		*cp++ = '0' + ifp->if_unit; *cp = '\0';
587 		if ((ifa = ifp->if_addrlist) == 0) {
588 			bzero((caddr_t)&ifr.ifr_addr, sizeof(ifr.ifr_addr));
589 			error = copyout((caddr_t)&ifr, (caddr_t)ifrp, sizeof (ifr));
590 			if (error)
591 				break;
592 			space -= sizeof (ifr), ifrp++;
593 		} else
594 		    for ( ; space > sizeof (ifr) && ifa; ifa = ifa->ifa_next) {
595 			register struct sockaddr *sa = ifa->ifa_addr;
596 #ifdef COMPAT_43
597 			if (cmd == OSIOCGIFCONF) {
598 				struct osockaddr *osa =
599 					 (struct osockaddr *)&ifr.ifr_addr;
600 				ifr.ifr_addr = *sa;
601 				osa->sa_family = sa->sa_family;
602 				error = copyout((caddr_t)&ifr, (caddr_t)ifrp,
603 						sizeof (ifr));
604 				ifrp++;
605 			} else
606 #endif
607 			if (sa->sa_len <= sizeof(*sa)) {
608 				ifr.ifr_addr = *sa;
609 				error = copyout((caddr_t)&ifr, (caddr_t)ifrp,
610 						sizeof (ifr));
611 				ifrp++;
612 			} else {
613 				space -= sa->sa_len - sizeof(*sa);
614 				if (space < sizeof (ifr))
615 					break;
616 				error = copyout((caddr_t)&ifr, (caddr_t)ifrp,
617 						sizeof (ifr.ifr_name));
618 				if (error == 0)
619 				    error = copyout((caddr_t)sa,
620 				      (caddr_t)&ifrp->ifr_addr, sa->sa_len);
621 				ifrp = (struct ifreq *)
622 					(sa->sa_len + (caddr_t)&ifrp->ifr_addr);
623 			}
624 			if (error)
625 				break;
626 			space -= sizeof (ifr);
627 		}
628 	}
629 	ifc->ifc_len -= space;
630 	return (error);
631 }
632 
633 static char *
634 sprint_d(n, buf, buflen)
635 	u_int n;
636 	char *buf;
637 	int buflen;
638 {
639 	register char *cp = buf + buflen - 1;
640 
641 	*cp = 0;
642 	do {
643 		cp--;
644 		*cp = "0123456789"[n % 10];
645 		n /= 10;
646 	} while (n != 0);
647 	return (cp);
648 }
649