if.c

eCos操作系统源码

			if (ifa_maybe == 0 ||
			    rn_refines((caddr_t)ifa->ifa_netmask,
			    (caddr_t)ifa_maybe->ifa_netmask))
				ifa_maybe = ifa;
		}
	return (ifa_maybe);
}

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

	for (ifp = ifnet.tqh_first; ifp != 0; ifp = ifp->if_list.tqe_next)
		for (ifa = ifp->if_addrlist.tqh_first; ifa != 0; ifa = ifa->ifa_list.tqe_next)
			if (ifa->ifa_addr->sa_family == af)
				return (ifa);
	return (NULL);
}

/*
 * Find an interface address specific to an interface best matching
 * a given address.
 */
struct ifaddr *
ifaof_ifpforaddr(addr, ifp)
	struct sockaddr *addr;
	register struct ifnet *ifp;
{
	register struct ifaddr *ifa;
	register char *cp, *cp2, *cp3;
	register char *cplim;
	struct ifaddr *ifa_maybe = 0;
	u_int af = addr->sa_family;

	if (af >= AF_MAX)
		return (NULL);
	for (ifa = ifp->if_addrlist.tqh_first; ifa != 0; ifa = ifa->ifa_list.tqe_next) {
		if (ifa->ifa_addr->sa_family != af)
			continue;
		ifa_maybe = ifa;
		if (ifa->ifa_netmask == 0) {
			if (equal(addr, ifa->ifa_addr) ||
			    (ifa->ifa_dstaddr && equal(addr, ifa->ifa_dstaddr)))
				return (ifa);
			continue;
		}
		cp = addr->sa_data;
		cp2 = ifa->ifa_addr->sa_data;
		cp3 = ifa->ifa_netmask->sa_data;
		cplim = ifa->ifa_netmask->sa_len + (char *)ifa->ifa_netmask;
		for (; cp3 < cplim; cp3++)
			if ((*cp++ ^ *cp2++) & *cp3)
				break;
		if (cp3 == cplim)
			return (ifa);
	}
	return (ifa_maybe);
}

/*
 * Default action when installing a route with a Link Level gateway.
 * Lookup an appropriate real ifa to point to.
 * This should be moved to /sys/net/link.c eventually.
 */
void
link_rtrequest(cmd, rt, sa)
	int cmd;
	register struct rtentry *rt;
	struct sockaddr *sa;
{
	register struct ifaddr *ifa;
	struct sockaddr *dst;
	struct ifnet *ifp;

	if (cmd != RTM_ADD || ((ifa = rt->rt_ifa) == 0) ||
	    ((ifp = ifa->ifa_ifp) == 0) || ((dst = rt_key(rt)) == 0))
		return;
	if ((ifa = ifaof_ifpforaddr(dst, ifp)) != NULL) {
		IFAFREE(rt->rt_ifa);
		rt->rt_ifa = ifa;
		ifa->ifa_refcnt++;
		if (ifa->ifa_rtrequest && ifa->ifa_rtrequest != link_rtrequest)
			ifa->ifa_rtrequest(cmd, rt, sa);
	}
}

/*
 * Mark an interface down and notify protocols of
 * the transition.
 * NOTE: must be called at splsoftnet or equivalent.
 */
void
if_down(ifp)
	register struct ifnet *ifp;
{
	register struct ifaddr *ifa;

	ifp->if_flags &= ~IFF_UP;
	for (ifa = ifp->if_addrlist.tqh_first; ifa != 0; ifa = ifa->ifa_list.tqe_next)
		pfctlinput(PRC_IFDOWN, ifa->ifa_addr);
	if_qflush(&ifp->if_snd);
	rt_ifmsg(ifp);
}

/*
 * Mark an interface up and notify protocols of
 * the transition.
 * NOTE: must be called at splsoftnet or equivalent.
 */
void
if_up(ifp)
	register struct ifnet *ifp;
{
#ifdef notyet
	register struct ifaddr *ifa;
#endif

	ifp->if_flags |= IFF_UP;
#ifdef notyet
	/* this has no effect on IP, and will kill all ISO connections XXX */
	for (ifa = ifp->if_addrlist.tqh_first; ifa != 0;
	     ifa = ifa->ifa_list.tqe_next)
		pfctlinput(PRC_IFUP, ifa->ifa_addr);
#endif
	rt_ifmsg(ifp);
#ifdef INET6
	in6_if_up(ifp);
#endif
}

/*
 * Flush an interface queue.
 */
void
if_qflush(ifq)
	register struct ifqueue *ifq;
{
	register struct mbuf *m, *n;

	n = ifq->ifq_head;
	while ((m = n) != NULL) {
		n = m->m_act;
		m_freem(m);
	}
	ifq->ifq_head = 0;
	ifq->ifq_tail = 0;
	ifq->ifq_len = 0;
}

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

	for (ifp = ifnet.tqh_first; ifp != 0; ifp = ifp->if_list.tqe_next) {
		if (ifp->if_timer == 0 || --ifp->if_timer)
			continue;
		if (ifp->if_watchdog)
			(*ifp->if_watchdog)(ifp);
	}
	splx(s);
	timeout(if_slowtimo, NULL, hz / IFNET_SLOWHZ);
}

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

	for (ifp = ifnet.tqh_first; ifp != 0; ifp = ifp->if_list.tqe_next)
		if (strcmp(ifp->if_xname, name) == 0)
			return (ifp);

	return (NULL);
}


/*
 * Map interface name in a sockaddr_dl to
 * interface structure pointer.
 */
struct ifnet *
if_withname(sa)
	struct sockaddr *sa;
{
	char ifname[IFNAMSIZ+1];
	struct sockaddr_dl *sdl = (struct sockaddr_dl *)sa;

	if ( (sa->sa_family != AF_LINK) || (sdl->sdl_nlen == 0) ||
	     (sdl->sdl_nlen > IFNAMSIZ) )
		return NULL;

	/*
	 * ifunit wants a null-terminated name.  It may not be null-terminated
	 * in the sockaddr.  We don't want to change the caller's sockaddr,
	 * and there might not be room to put the trailing null anyway, so we
	 * make a local copy that we know we can null terminate safely.
	 */

	bcopy(sdl->sdl_data, ifname, sdl->sdl_nlen);
	ifname[sdl->sdl_nlen] = '\0';
	return ifunit(ifname);
}


/*
 * Interface ioctls.
 */
int
ifioctl(so, cmd, data, p)
	struct socket *so;
	u_long cmd;
	caddr_t data;
	struct proc *p;
{
	register struct ifnet *ifp;
	register struct ifreq *ifr;
	int error = 0;
	short oif_flags;

	switch (cmd) {

	case SIOCGIFCONF:
	case OSIOCGIFCONF:
		return (ifconf(cmd, data));
	}
	ifr = (struct ifreq *)data;
	ifp = ifunit(ifr->ifr_name);
	if (ifp == 0)
		return (ENXIO);
	oif_flags = ifp->if_flags;
	switch (cmd) {

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

	case SIOCGIFMETRIC:
		ifr->ifr_metric = ifp->if_metric;
		break;

	case SIOCGIFDATA:
		error = copyout((caddr_t)&ifp->if_data, ifr->ifr_data,
		    sizeof(ifp->if_data));
		break;

	case SIOCSIFFLAGS:
#ifndef __ECOS
		if ((error = suser(p->p_ucred, &p->p_acflag)) != 0)
			return (error);
#endif
		if (ifp->if_flags & IFF_UP && (ifr->ifr_flags & IFF_UP) == 0) {
			int s = splimp();
			if_down(ifp);
			splx(s);
		}
		if (ifr->ifr_flags & IFF_UP && (ifp->if_flags & IFF_UP) == 0) {
			int s = splimp();
			if_up(ifp);
			splx(s);
		}
		ifp->if_flags = (ifp->if_flags & IFF_CANTCHANGE) |
			(ifr->ifr_flags &~ IFF_CANTCHANGE);
		if (ifp->if_ioctl)
			(void) (*ifp->if_ioctl)(ifp, cmd, data);
		break;

	case SIOCSIFMETRIC:
#ifndef __ECOS
		if ((error = suser(p->p_ucred, &p->p_acflag)) != 0)
			return (error);
#endif
		ifp->if_metric = ifr->ifr_metric;
		break;

	case SIOCADDMULTI:
	case SIOCDELMULTI:
	case SIOCSIFMEDIA:
#ifndef __ECOS
		if ((error = suser(p->p_ucred, &p->p_acflag)) != 0)
			return (error);
#endif
		/* FALLTHROUGH */
#ifdef SIOCGIFSTATS
        case SIOCGIFSTATS:
#ifdef SIOCGIFSTATSUD
        case SIOCGIFSTATSUD:
#endif
#endif // SIOCGIFSTATS
	case SIOCGIFMEDIA:
		if (ifp->if_ioctl == 0)
			return (EOPNOTSUPP);
		error = (*ifp->if_ioctl)(ifp, cmd, data);
		break;

	default:
		if (so->so_proto == 0)
			return (EOPNOTSUPP);
#if !defined(COMPAT_43) && !defined(COMPAT_LINUX) && !defined(COMPAT_SVR4)
		error = ((*so->so_proto->pr_usrreq)(so, PRU_CONTROL,
			(struct mbuf *) cmd, (struct mbuf *) data,
			(struct mbuf *) ifp));
#else
	    {
		u_long ocmd = cmd;

		switch (cmd) {

		case SIOCSIFADDR:
		case SIOCSIFDSTADDR:
		case SIOCSIFBRDADDR:
		case SIOCSIFNETMASK:
#if BYTE_ORDER != BIG_ENDIAN
			if (ifr->ifr_addr.sa_family == 0 &&
			    ifr->ifr_addr.sa_len < 16) {
				ifr->ifr_addr.sa_family = ifr->ifr_addr.sa_len;
				ifr->ifr_addr.sa_len = 16;
			}
#else
			if (ifr->ifr_addr.sa_len == 0)
				ifr->ifr_addr.sa_len = 16;
#endif
			break;

		case OSIOCGIFADDR:
			cmd = SIOCGIFADDR;
			break;

		case OSIOCGIFDSTADDR:
			cmd = SIOCGIFDSTADDR;
			break;

		case OSIOCGIFBRDADDR:
			cmd = SIOCGIFBRDADDR;
			break;

		case OSIOCGIFNETMASK:
			cmd = SIOCGIFNETMASK;
		}
		error = ((*so->so_proto->pr_usrreq)(so, PRU_CONTROL,
						    (struct mbuf *) cmd,
						    (struct mbuf *) data,
						    (struct mbuf *) ifp));
		switch (ocmd) {

		case OSIOCGIFADDR:
		case OSIOCGIFDSTADDR:
		case OSIOCGIFBRDADDR:
		case OSIOCGIFNETMASK:
			*(u_int16_t *)&ifr->ifr_addr = ifr->ifr_addr.sa_family;
		}

	    }
#endif
		break;
	}

	if (((oif_flags ^ ifp->if_flags) & IFF_UP) != 0) {
#ifdef INET6
		if ((ifp->if_flags & IFF_UP) != 0) {
			int s = splimp();
			in6_if_up(ifp);
			splx(s);
		}
#endif
  	}
	return (error);
}

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

	/* If ifc->ifc_len is 0, fill it in with the needed size and return. */
	if (space == 0) {
		for (ifp = ifnet.tqh_first; ifp; ifp = ifp->if_list.tqe_next) {
			register struct sockaddr *sa;

			if ((ifa = ifp->if_addrlist.tqh_first) == 0)
				space += sizeof (ifr);
			else 
				for (; ifa != 0; ifa = ifa->ifa_list.tqe_next) {
					sa = ifa->ifa_addr;
#if defined(COMPAT_43) || defined(COMPAT_LINUX) || defined(COMPAT_SVR4)
					if (cmd != OSIOCGIFCONF)
#endif
					if (sa->sa_len > sizeof(*sa))
						space += sa->sa_len -
						    sizeof (*sa);
					space += sizeof (ifr);
				}
		}
		ifc->ifc_len = space;
		return(0);
	}

	ifrp = ifc->ifc_req;
	for (ifp = ifnet.tqh_first; space >= sizeof (ifr) && ifp != 0;
	    ifp = ifp->if_list.tqe_next) {
		bcopy(ifp->if_xname, ifr.ifr_name, IFNAMSIZ);
		if ((ifa = ifp->if_addrlist.tqh_first) == 0) {
			bzero((caddr_t)&ifr.ifr_addr, sizeof(ifr.ifr_addr));
			error = copyout((caddr_t)&ifr, (caddr_t)ifrp,
			    sizeof(ifr));
			if (error)
				break;
			space -= sizeof (ifr), ifrp++;
		} else 
			for (; space >= sizeof (ifr) && ifa != 0;
			    ifa = ifa->ifa_list.tqe_next) {
				register struct sockaddr *sa = ifa->ifa_addr;
#if defined(COMPAT_43) || defined(COMPAT_LINUX) || defined(COMPAT_SVR4)
				if (cmd == OSIOCGIFCONF) {
					struct osockaddr *osa =
					    (struct osockaddr *)&ifr.ifr_addr;
					ifr.ifr_addr = *sa;
					osa->sa_family = sa->sa_family;
					error = copyout((caddr_t)&ifr, (caddr_t)ifrp,
					    sizeof (ifr));
					ifrp++;
				} else
#endif
				if (sa->sa_len <= sizeof(*sa)) {
					ifr.ifr_addr = *sa;
					error = copyout((caddr_t)&ifr, (caddr_t)ifrp,
					    sizeof (ifr));
					ifrp++;
				} else {
					space -= sa->sa_len - sizeof(*sa);
					if (space < sizeof (ifr))
						break;
					error = copyout((caddr_t)&ifr, (caddr_t)ifrp,
					    sizeof (ifr.ifr_name));
					if (error == 0)
						error = copyout((caddr_t)sa,
						    (caddr_t)&ifrp->ifr_addr,
						    sa->sa_len);
					ifrp = (struct ifreq *)(sa->sa_len +
					    (caddr_t)&ifrp->ifr_addr);
				}
				if (error)
					break;
				space -= sizeof (ifr);
			}
	}
	ifc->ifc_len -= space;
	return (error);
}