xref: /csrg-svn/sys/net/if.c (revision 11630)
1*11630Ssam /*	if.c	4.27	83/03/19	*/
24944Swnj 
34944Swnj #include "../h/param.h"
44944Swnj #include "../h/systm.h"
56333Ssam #include "../h/socket.h"
66582Ssam #include "../h/protosw.h"
710872Ssam #include "../h/time.h"
810872Ssam #include "../h/kernel.h"
911576Ssam #include "../h/ioctl.h"
1011576Ssam #include "../h/errno.h"
1110872Ssam 
124944Swnj #include "../net/if.h"
136333Ssam #include "../net/af.h"
144944Swnj 
156207Swnj int	ifqmaxlen = IFQ_MAXLEN;
166207Swnj 
176333Ssam /*
186333Ssam  * Network interface utility routines.
196333Ssam  *
206333Ssam  * Routines with if_ifwith* names take sockaddr *'s as
216333Ssam  * parameters.  Other routines take value parameters,
226333Ssam  * e.g. if_ifwithnet takes the network number.
236333Ssam  */
246333Ssam 
255206Swnj ifinit()
265206Swnj {
275206Swnj 	register struct ifnet *ifp;
285206Swnj 
295206Swnj 	for (ifp = ifnet; ifp; ifp = ifp->if_next)
306207Swnj 		if (ifp->if_init) {
316333Ssam 			(*ifp->if_init)(ifp->if_unit);
326207Swnj 			if (ifp->if_snd.ifq_maxlen == 0)
336207Swnj 				ifp->if_snd.ifq_maxlen = ifqmaxlen;
346207Swnj 		}
358173Sroot 	if_slowtimo();
365206Swnj }
375206Swnj 
388393Swnj #if vax
396333Ssam /*
406333Ssam  * Call each interface on a Unibus reset.
416333Ssam  */
425206Swnj ifubareset(uban)
435206Swnj 	int uban;
445206Swnj {
455206Swnj 	register struct ifnet *ifp;
465206Swnj 
475206Swnj 	for (ifp = ifnet; ifp; ifp = ifp->if_next)
488974Sroot 		if (ifp->if_reset)
498974Sroot 			(*ifp->if_reset)(uban);
505206Swnj }
518393Swnj #endif
525206Swnj 
536333Ssam /*
546333Ssam  * Attach an interface to the
556333Ssam  * list of "active" interfaces.
566333Ssam  */
575160Swnj if_attach(ifp)
585160Swnj 	struct ifnet *ifp;
595160Swnj {
605698Swnj 	register struct ifnet **p = &ifnet;
615160Swnj 
625698Swnj 	while (*p)
635698Swnj 		p = &((*p)->if_next);
645698Swnj 	*p = ifp;
655160Swnj }
665160Swnj 
676333Ssam /*
686333Ssam  * Locate an interface based on a complete address.
696333Ssam  */
704951Swnj /*ARGSUSED*/
714951Swnj struct ifnet *
726333Ssam if_ifwithaddr(addr)
736333Ssam 	struct sockaddr *addr;
744944Swnj {
754944Swnj 	register struct ifnet *ifp;
764944Swnj 
776333Ssam #define	equal(a1, a2) \
786333Ssam 	(bcmp((caddr_t)((a1)->sa_data), (caddr_t)((a2)->sa_data), 14) == 0)
796333Ssam 	for (ifp = ifnet; ifp; ifp = ifp->if_next) {
806333Ssam 		if (ifp->if_addr.sa_family != addr->sa_family)
816333Ssam 			continue;
826333Ssam 		if (equal(&ifp->if_addr, addr))
834944Swnj 			break;
846333Ssam 		if ((ifp->if_flags & IFF_BROADCAST) &&
856333Ssam 		    equal(&ifp->if_broadaddr, addr))
866333Ssam 			break;
876333Ssam 	}
884944Swnj 	return (ifp);
894944Swnj }
904944Swnj 
916333Ssam /*
926333Ssam  * Find an interface on a specific network.  If many, choice
936333Ssam  * is first found.
946333Ssam  */
954951Swnj struct ifnet *
966333Ssam if_ifwithnet(addr)
976333Ssam 	register struct sockaddr *addr;
984944Swnj {
994944Swnj 	register struct ifnet *ifp;
1008393Swnj 	register u_int af = addr->sa_family;
1016619Ssam 	register int (*netmatch)();
1024944Swnj 
1036619Ssam 	if (af >= AF_MAX)
1046619Ssam 		return (0);
1056619Ssam 	netmatch = afswitch[af].af_netmatch;
1066333Ssam 	for (ifp = ifnet; ifp; ifp = ifp->if_next) {
1076333Ssam 		if (af != ifp->if_addr.sa_family)
1086333Ssam 			continue;
1096333Ssam 		if ((*netmatch)(addr, &ifp->if_addr))
1106333Ssam 			break;
1116333Ssam 	}
1126333Ssam 	return (ifp);
1136333Ssam }
1146333Ssam 
1156333Ssam /*
1166333Ssam  * As above, but parameter is network number.
1176333Ssam  */
1186333Ssam struct ifnet *
1196333Ssam if_ifonnetof(net)
1206333Ssam 	register int net;
1216333Ssam {
1226333Ssam 	register struct ifnet *ifp;
1236333Ssam 
1244944Swnj 	for (ifp = ifnet; ifp; ifp = ifp->if_next)
1254944Swnj 		if (ifp->if_net == net)
1264944Swnj 			break;
1274944Swnj 	return (ifp);
1284944Swnj }
1294944Swnj 
1306333Ssam /*
1316333Ssam  * Find an interface using a specific address family
1326333Ssam  */
1335083Swnj struct ifnet *
1346333Ssam if_ifwithaf(af)
1356333Ssam 	register int af;
1365083Swnj {
1376333Ssam 	register struct ifnet *ifp;
1385083Swnj 
1396333Ssam 	for (ifp = ifnet; ifp; ifp = ifp->if_next)
1406333Ssam 		if (ifp->if_addr.sa_family == af)
1416333Ssam 			break;
1426333Ssam 	return (ifp);
1435083Swnj }
1445104Swnj 
1456333Ssam /*
1466582Ssam  * Mark an interface down and notify protocols of
1476582Ssam  * the transition.
1489184Ssam  * NOTE: must be called at splnet or eqivalent.
1496582Ssam  */
1506582Ssam if_down(ifp)
1516582Ssam 	register struct ifnet *ifp;
1526582Ssam {
1538173Sroot 
1546582Ssam 	ifp->if_flags &= ~IFF_UP;
1556582Ssam 	pfctlinput(PRC_IFDOWN, (caddr_t)&ifp->if_addr);
1566582Ssam }
1577264Ssam 
1587264Ssam /*
1597264Ssam  * Handle interface watchdog timer routines.  Called
1607264Ssam  * from softclock, we decrement timers (if set) and
1617264Ssam  * call the appropriate interface routine on expiration.
1627264Ssam  */
1637264Ssam if_slowtimo()
1647264Ssam {
1657264Ssam 	register struct ifnet *ifp;
1667264Ssam 
1679184Ssam 	for (ifp = ifnet; ifp; ifp = ifp->if_next) {
1689184Ssam 		if (ifp->if_timer == 0 || --ifp->if_timer)
1699184Ssam 			continue;
1709184Ssam 		if (ifp->if_watchdog)
1717264Ssam 			(*ifp->if_watchdog)(ifp->if_unit);
1729184Ssam 	}
1738692Sroot 	timeout(if_slowtimo, (caddr_t)0, hz / IFNET_SLOWHZ);
1747264Ssam }
17511576Ssam 
17611576Ssam /*
17711576Ssam  * Service a socket ioctl request directed
17811576Ssam  * to an interface.
17911576Ssam  */
18011576Ssam ifrequest(cmd, data)
18111576Ssam 	int cmd;
18211576Ssam 	caddr_t data;
18311576Ssam {
18411576Ssam 	register struct ifnet *ifp;
18511576Ssam 	register struct ifreq *ifr;
18611576Ssam 	register char *cp;
18711576Ssam 	int unit, s;
18811576Ssam 
18911576Ssam 	ifr = (struct ifreq *)data;
19011576Ssam 	for (cp = ifr->ifr_name; *cp; cp++)
19111576Ssam 		if (*cp >= '0' && *cp <= '9')
19211576Ssam 			break;
19311576Ssam 	if (*cp == 0)
19411576Ssam 		return (ENXIO);		/* couldn't find unit */
19511576Ssam 	unit = *cp - '0', *cp = 0;
19611576Ssam 	for (ifp = ifnet; ifp; ifp = ifp->if_next) {
19711576Ssam 		if (bcmp(ifp->if_name, ifr->ifr_name, cp - ifr->ifr_name))
19811576Ssam 			continue;
19911576Ssam 		if (unit == ifp->if_unit)
20011576Ssam 			goto found;
20111576Ssam 	}
20211576Ssam 	return (ENXIO);
20311576Ssam 
20411576Ssam found:
20511576Ssam 	switch (cmd) {
20611576Ssam 
20711576Ssam 	case SIOCGIFADDR:
20811576Ssam 		ifr->ifr_addr = ifp->if_addr;
20911576Ssam 		break;
21011576Ssam 
21111576Ssam 	case SIOCSIFADDR:
21211576Ssam 		if_rtinit(ifp, -1);	/* delete previous route */
21311576Ssam 		s = splimp();
21411576Ssam 		ifp->if_addr = ifr->ifr_addr;
21511576Ssam 		(*ifp->if_init)(unit);
21611576Ssam 		splx(s);
21711576Ssam 		break;
21811576Ssam 
21911576Ssam 	case SIOCGIFDSTADDR:
22011576Ssam 		if ((ifp->if_flags & IFF_POINTOPOINT) == 0)
22111576Ssam 			return (EINVAL);
22211576Ssam 		ifr->ifr_dstaddr = ifp->if_dstaddr;
22311576Ssam 		break;
22411576Ssam 
22511576Ssam 	case SIOCSIFDSTADDR:
22611576Ssam 		if ((ifp->if_flags & IFF_POINTOPOINT) == 0)
22711576Ssam 			return (EINVAL);
22811576Ssam 		s = splimp();
22911576Ssam 		ifp->if_dstaddr = ifr->ifr_dstaddr;
23011576Ssam 		splx(s);
23111576Ssam 		break;
23211576Ssam 
23311576Ssam 	case SIOCGIFFLAGS:
23411576Ssam 		ifr->ifr_flags = ifp->if_flags;
23511576Ssam 		break;
23611576Ssam 
23711576Ssam 	case SIOCSIFFLAGS:
23811576Ssam 		if ((ifr->ifr_flags & IFF_UP) == 0 &&
23911576Ssam 		    (ifp->if_flags & IFF_UP)) {
24011576Ssam 			s = splimp();
24111576Ssam 			if_down(ifp);
24211576Ssam 			splx(s);
24311576Ssam 		}
24411576Ssam 		ifp->if_flags = ifr->ifr_flags;
24511576Ssam 		break;
24611576Ssam 
24711576Ssam 	default:
24811576Ssam 		return (EINVAL);
24911576Ssam 	}
25011576Ssam 	return (0);
25111576Ssam }
25211576Ssam 
25311576Ssam /*
25411576Ssam  * Return interface configuration
25511576Ssam  * of system.  List may be used
25611576Ssam  * in later ioctl's (above) to get
25711576Ssam  * other information.
25811576Ssam  */
25911576Ssam ifconf(cmd, data)
26011576Ssam 	int cmd;
26111576Ssam 	caddr_t data;
26211576Ssam {
26311576Ssam 	register struct ifconf *ifc = (struct ifconf *)data;
26411576Ssam 	register struct ifnet *ifp = ifnet;
265*11630Ssam 	register char *cp, *ep;
266*11630Ssam 	struct ifreq ifr, *ifrp;
26711576Ssam 	int space = ifc->ifc_len, error = 0;
26811576Ssam 
269*11630Ssam 	ifrp = ifc->ifc_req;
270*11630Ssam 	ep = ifr.ifr_name + sizeof (ifr.ifr_name) - 2;
27111576Ssam 	for (; space > sizeof (ifr) && ifp; ifp = ifp->if_next) {
272*11630Ssam 		bcopy(ifp->if_name, ifr.ifr_name, sizeof (ifr.ifr_name) - 2);
273*11630Ssam 		for (cp = ifr.ifr_name; cp < ep && *cp; cp++)
27411576Ssam 			;
275*11630Ssam 		*cp++ = '0' + ifp->if_unit; *cp = '\0';
27611576Ssam 		ifr.ifr_addr = ifp->if_addr;
277*11630Ssam 		error = copyout((caddr_t)&ifr, (caddr_t)ifrp, sizeof (ifr));
27811576Ssam 		if (error)
27911576Ssam 			break;
280*11630Ssam 		space -= sizeof (ifr), ifrp++;
28111576Ssam 	}
28211576Ssam 	ifc->ifc_len -= space;
28311576Ssam 	return (error);
28411576Ssam }
285