2.9BSD/usr/net/sys/net/if.c

/*	if.c	4.18	82/06/23	*/

#include "param.h"
#include <sys/systm.h>
#include <sys/socket.h>
#include <sys/protosw.h>
#include <sys/ioctl.h>
#include <sys/dir.h>
#include <sys/user.h>
#include <errno.h>
#include "../net/in.h"
#include "../net/in_systm.h"
#include "../net/if.h"
#include "../net/af.h"

int	ifqmaxlen = IFQ_MAXLEN;

/*
 * Network interface utility routines.
 *
 * Routines with if_ifwith* names take sockaddr *'s as
 * parameters.  Other routines take value parameters,
 * e.g. if_ifwithnet takes the network number.
 */

ifinit()
{
	register struct ifnet *ifp;

	for (ifp = ifnet; ifp; ifp = ifp->if_next)
		if (ifp->if_init) {
			(*ifp->if_init)(ifp->if_unit);
			if (ifp->if_snd.ifq_maxlen == 0)
				ifp->if_snd.ifq_maxlen = ifqmaxlen;
		}
}

/*
 * Call each interface on a Unibus reset.
 */
ifubareset(uban)
	int uban;
{
	register struct ifnet *ifp;

	for (ifp = ifnet; ifp; ifp = ifp->if_next)
		if (ifp->if_ubareset)
			(*ifp->if_ubareset)(uban);
}

/*
 * Attach an interface to the
 * list of "active" interfaces.
 */
if_attach(ifp)
	struct ifnet *ifp;
{
	register struct ifnet **p = &ifnet;

	while (*p)
		p = &((*p)->if_next);
	*p = ifp;
}

/*
 * Locate an interface based on a complete address.
 */
/*ARGSUSED*/
struct ifnet *
if_ifwithaddr(addr)
	struct sockaddr *addr;
{
	register struct ifnet *ifp;

#define	equal(a1, a2) \
	(bcmp((caddr_t)((a1)->sa_data), (caddr_t)((a2)->sa_data), 14) == 0)
	for (ifp = ifnet; ifp; ifp = ifp->if_next) {
		if (ifp->if_addr.sa_family != addr->sa_family)
			continue;
		if (equal(&ifp->if_addr, addr))
			break;
		if ((ifp->if_flags & IFF_BROADCAST) &&
		    equal(&ifp->if_broadaddr, addr))
			break;
	}
	return (ifp);
}

/*
 * Find an interface on a specific network.  If many, choice
 * is first found.
 */
struct ifnet *
if_ifwithnet(addr)
	register struct sockaddr *addr;
{
	register struct ifnet *ifp;
	register int af = addr->sa_family;
	register int (*netmatch)();

	if (af >= AF_MAX)
		return (0);
	netmatch = afswitch[af].af_netmatch;
	for (ifp = ifnet; ifp; ifp = ifp->if_next) {
		if (af != ifp->if_addr.sa_family)
			continue;
		if ((*netmatch)(addr, &ifp->if_addr))
			break;
	}
	return (ifp);
}

/*
 * As above, but parameter is network number.
 */
struct ifnet *
if_ifonnetof(net)
	register u_long net;
{
	register struct ifnet *ifp;

	for (ifp = ifnet; ifp; ifp = ifp->if_next)
		if (ifp->if_net == net)
			break;
	return (ifp);
}

/*
 * Find an interface using a specific address family
 */
struct ifnet *
if_ifwithaf(af)
	register int af;
{
	register struct ifnet *ifp;

	for (ifp = ifnet; ifp; ifp = ifp->if_next)
		if (ifp->if_addr.sa_family == af)
			break;
	return (ifp);
}

/*
 * Mark an interface down and notify protocols of
 * the transition.
 * NOTE: must be called at splnet or equivalent. */
if_down(ifp)
	register struct ifnet *ifp;
{
	ifp->if_flags &= ~IFF_UP;
	pfctlinput(PRC_IFDOWN, (caddr_t)&ifp->if_addr);
}

/*
 * Handle interface watchdog timer routines.  Called
 * from softclock, we decrement timers (if set) and
 * call the appropriate interface routine on expiration.
 */
if_slowtimo()
{
	register struct ifnet *ifp;

	for (ifp = ifnet; ifp; ifp = ifp->if_next) {
		if (ifp->if_timer == 0 || --ifp->if_timer)
			continue;
		if (ifp->if_watchdog)
			(*ifp->if_watchdog)(ifp->if_unit);
	}
}

/*
 * Map interface name to
 * interface structure pointer.
 */
struct ifnet *
ifunit(name)
	register char *name;
{
	register char *cp;
	register struct ifnet *ifp;
	int unit;

	for (cp = name; cp < name + IFNAMSIZ && *cp; cp++)
		if (*cp >= '0' && *cp <= '9')
			break;
	if (*cp == '\0' || cp == name + IFNAMSIZ)
		return ((struct ifnet *)0);
	unit = *cp - '0';
	*cp = 0;
	for (ifp = ifnet; ifp; ifp = ifp->if_next) {
		if (bcmp(ifp->if_name, name, (unsigned)(cp - name)))
			continue;
		if (unit == ifp->if_unit)
			break;
	}
	return (ifp);
}

/*
 * Interface ioctls.
 */
ifioctl(cmd, data)
	int cmd;
	caddr_t data;
{
	register struct ifnet *ifp;
	register struct ifreq *ifr;
	struct ifreq uifr;		/* user's ifreq structure */

	if (copyin(data, (caddr_t) &uifr, sizeof(uifr))) {
		return(EFAULT);
	}
	switch (cmd) {

	case SIOCGIFCONF:
		return (ifconf(cmd, (caddr_t)&uifr));

	case SIOCSIFADDR:
	case SIOCSIFFLAGS:
	case SIOCSIFDSTADDR:
		if (!suser())
			return (u.u_error);
		break;
	}
	ifr = (struct ifreq *)&uifr;
	ifp = ifunit(ifr->ifr_name);
	if (ifp == (struct ifnet *)0)
		return (ENXIO);
	switch (cmd) {

	case SIOCGIFADDR:
		ifr->ifr_addr = ifp->if_addr;
		break;

	case SIOCGIFDSTADDR:
		if ((ifp->if_flags & IFF_POINTOPOINT) == 0)
			return (EINVAL);
		ifr->ifr_dstaddr = ifp->if_dstaddr;
		break;

	case SIOCGIFFLAGS:
		ifr->ifr_flags = ifp->if_flags;
		break;

	case SIOCSIFFLAGS:
		if (ifp->if_flags & IFF_UP && (ifr->ifr_flags & IFF_UP) == 0) {
			int s = splimp();
			if_down(ifp);
			splx(s);
  		}
		ifp->if_flags = ifr->ifr_flags;
		break;

	default:
		if (ifp->if_ioctl == 0)
			return (EOPNOTSUPP);
		return ((*ifp->if_ioctl)(ifp, cmd, (caddr_t)&uifr));
	}
	if (copyout((caddr_t)&uifr, data, sizeof(uifr))) {
		return(EFAULT);
	}
	return (0);
}

/*
 * Return interface configuration
 * of system.  List may be used
 * in later ioctl's (above) to get
 * other information.
 */
/*ARGSUSED*/
ifconf(cmd, data)
	int cmd;
	caddr_t data;
{
	register struct ifconf *ifc = (struct ifconf *)data;
	register struct ifnet *ifp = ifnet;
	register char *cp, *ep;
	struct ifreq ifr, *ifrp;
	int space = ifc->ifc_len, error = 0;

	ifrp = ifc->ifc_req;
	ep = ifr.ifr_name + sizeof (ifr.ifr_name) - 2;
	for (; space > sizeof (ifr) && ifp; ifp = ifp->if_next) {
		bcopy(ifp->if_name, ifr.ifr_name, sizeof (ifr.ifr_name) - 2);
		for (cp = ifr.ifr_name; cp < ep && *cp; cp++)
			;
		*cp+= '0' + ifp->if_unit; *cp = '\0';
		ifr.ifr_addr = ifp->if_addr;
		error = copyout((caddr_t)&ifr, (caddr_t)ifrp, sizeof (ifr));
		if (error)
			break;
		space -= sizeof (ifr), ifrp++;
	}
	ifc->ifc_len -= space;
	return (error);
}