if.c

eCos操作系统源码

		} else 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);
		getmicrotime(&ifp->if_lastchange);
		break;

	case SIOCSIFMETRIC:
		ifp->if_metric = ifr->ifr_metric;
		getmicrotime(&ifp->if_lastchange);
		break;

	case SIOCSIFPHYS:
		if (!ifp->if_ioctl)
		        return EOPNOTSUPP;
		error = (*ifp->if_ioctl)(ifp, cmd, data);
		if (error == 0)
			getmicrotime(&ifp->if_lastchange);
		return(error);

	case SIOCSIFMTU:
	{
		u_long oldmtu = ifp->if_mtu;

		if (ifp->if_ioctl == NULL)
			return (EOPNOTSUPP);
		if (ifr->ifr_mtu < IF_MINMTU || ifr->ifr_mtu > IF_MAXMTU)
			return (EINVAL);
		error = (*ifp->if_ioctl)(ifp, cmd, data);
		if (error == 0) {
			getmicrotime(&ifp->if_lastchange);
			rt_ifmsg(ifp);
		}
		/*
		 * If the link MTU changed, do network layer specific procedure.
		 */
		if (ifp->if_mtu != oldmtu) {
#ifdef INET6
			nd6_setmtu(ifp);
#endif
		}
		return (error);
	}

	case SIOCADDMULTI:
	case SIOCDELMULTI:

		/* Don't allow group membership on non-multicast interfaces. */
		if ((ifp->if_flags & IFF_MULTICAST) == 0)
			return EOPNOTSUPP;

		/* Don't let users screw up protocols' entries. */
		if (ifr->ifr_addr.sa_family != AF_LINK)
			return EINVAL;

                log(LOG_IOCTL, "%s: %s Multi\n", __FUNCTION__, 
                    (cmd == SIOCADDMULTI) ? "Add" : "Del");
                log_dump(LOG_IOCTL, &ifr->ifr_addr, 32);
		if (cmd == SIOCADDMULTI) {
			struct ifmultiaddr *ifma;
			error = if_addmulti(ifp, &ifr->ifr_addr, &ifma);
		} else {
			error = if_delmulti(ifp, &ifr->ifr_addr);
		}
		if (error == 0)
			getmicrotime(&ifp->if_lastchange);
		return error;

	case SIOCSIFPHYADDR:
	case SIOCDIFPHYADDR:
#ifdef INET6
	case SIOCSIFPHYADDR_IN6:
#endif
	case SIOCSLIFPHYADDR:
        case SIOCSIFMEDIA:
	case SIOCSIFGENERIC:
		if (ifp->if_ioctl == 0)
			return (EOPNOTSUPP);
		error = (*ifp->if_ioctl)(ifp, cmd, data);
		if (error == 0)
			getmicrotime(&ifp->if_lastchange);
		return error;

	case SIOCGIFSTATUS:
		ifs = (struct ifstat *)data;
		ifs->ascii[0] = '\0';
		
	case SIOCGIFPSRCADDR:
	case SIOCGIFPDSTADDR:
	case SIOCGLIFPHYADDR:
	case SIOCGIFMEDIA:
	case SIOCGIFGENERIC:
		if (ifp->if_ioctl == 0)
			return (EOPNOTSUPP);
		return ((*ifp->if_ioctl)(ifp, cmd, data));

	case SIOCSIFLLADDR:
		return if_setlladdr(ifp,
		    ifr->ifr_addr.sa_data, ifr->ifr_addr.sa_len);

	default:
		oif_flags = ifp->if_flags;
		if (so->so_proto == 0)
			return (EOPNOTSUPP);
#ifndef COMPAT_43
		error = ((*so->so_proto->pr_usrreqs->pru_control)(so, cmd,
								 data,
								 ifp, p));
#else
	    {
		int ocmd = cmd;

		switch (cmd) {

		case SIOCSIFDSTADDR:
		case SIOCSIFADDR:
		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_usrreqs->pru_control)(so,
								   cmd,
								   data,
								   ifp, p));
		switch (ocmd) {

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

		}
	    }
#endif /* COMPAT_43 */

		if ((oif_flags ^ ifp->if_flags) & IFF_UP) {
#ifdef INET6
#define DELAY cyg_thread_delay
			DELAY(100);/* XXX: temporary workaround for fxp issue*/
			if (ifp->if_flags & IFF_UP) {
				int s = splimp();
				in6_if_up(ifp);
				splx(s);
			}
#endif
		}
		return (error);

	}
	return (0);
}

/*
 * Set/clear promiscuous mode on interface ifp based on the truth value
 * of pswitch.  The calls are reference counted so that only the first
 * "on" request actually has an effect, as does the final "off" request.
 * Results are undefined if the "off" and "on" requests are not matched.
 */
int
ifpromisc(ifp, pswitch)
	struct ifnet *ifp;
	int pswitch;
{
	struct ifreq ifr;
	int error;
	int oldflags;

	oldflags = ifp->if_flags;
	if (pswitch) {
		/*
		 * If the device is not configured up, we cannot put it in
		 * promiscuous mode.
		 */
		if ((ifp->if_flags & IFF_UP) == 0)
			return (ENETDOWN);
		if (ifp->if_pcount++ != 0)
			return (0);
		ifp->if_flags |= IFF_PROMISC;
		log(LOG_INFO, "%s%d: promiscuous mode enabled\n",
		    ifp->if_name, ifp->if_unit);
	} else {
		if (--ifp->if_pcount > 0)
			return (0);
		ifp->if_flags &= ~IFF_PROMISC;
		log(LOG_INFO, "%s%d: promiscuous mode disabled\n",
		    ifp->if_name, ifp->if_unit);
	}
	ifr.ifr_flags = ifp->if_flags;
	error = (*ifp->if_ioctl)(ifp, SIOCSIFFLAGS, (caddr_t)&ifr);
	if (error == 0)
		rt_ifmsg(ifp);
	else
		ifp->if_flags = oldflags;
	return error;
}

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

	ifrp = ifc->ifc_req;
	for (; space > sizeof (ifr) && ifp; ifp = ifp->if_link.tqe_next) {
		char workbuf[64];
		int ifnlen, addrs;

		ifnlen = snprintf(workbuf, sizeof(workbuf),
		    "%s%d", ifp->if_name, ifp->if_unit);
		if(ifnlen + 1 > sizeof ifr.ifr_name) {
			error = ENAMETOOLONG;
			break;
		} else {
			strcpy(ifr.ifr_name, workbuf);
		}

		addrs = 0;
		ifa = ifp->if_addrhead.tqh_first;
		for ( ; space > sizeof (ifr) && ifa;
		    ifa = ifa->ifa_link.tqe_next) {
			register struct sockaddr *sa = ifa->ifa_addr;
			addrs++;
#ifdef COMPAT_43
			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 {
				if (space < sizeof (ifr) + sa->sa_len -
					    sizeof(*sa))
					break;
				space -= sa->sa_len - sizeof(*sa);
				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);
		}
		if (error)
			break;
		if (!addrs) {
			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++;
		}
	}
	ifc->ifc_len -= space;
	return (error);
}

/*
 * Just like if_promisc(), but for all-multicast-reception mode.
 */
int
if_allmulti(ifp, onswitch)
	struct ifnet *ifp;
	int onswitch;
{
	int error = 0;
	int s = splimp();

	if (onswitch) {
		if (ifp->if_amcount++ == 0) {
			ifp->if_flags |= IFF_ALLMULTI;
			error = ifp->if_ioctl(ifp, SIOCSIFFLAGS, 0);
		}
	} else {
		if (ifp->if_amcount > 1) {
			ifp->if_amcount--;
		} else {
			ifp->if_amcount = 0;
			ifp->if_flags &= ~IFF_ALLMULTI;
			error = ifp->if_ioctl(ifp, SIOCSIFFLAGS, 0);
		}
	}
	splx(s);

	if (error == 0)
		rt_ifmsg(ifp);
	return error;
}

/*
 * Add a multicast listenership to the interface in question.
 * The link layer provides a routine which converts
 */
int
if_addmulti(ifp, sa, retifma)
	struct ifnet *ifp;	/* interface to manipulate */
	struct sockaddr *sa;	/* address to add */
	struct ifmultiaddr **retifma;
{
	struct sockaddr *llsa, *dupsa;
	int error, s;
	struct ifmultiaddr *ifma;

	/*
	 * If the matching multicast address already exists
	 * then don't add a new one, just add a reference
	 */
	for (ifma = ifp->if_multiaddrs.lh_first; ifma;
	     ifma = ifma->ifma_link.le_next) {
		if (equal(sa, ifma->ifma_addr)) {
			ifma->ifma_refcount++;
			if (retifma)
				*retifma = ifma;
			return 0;
		}
	}

	/*
	 * Give the link layer a chance to accept/reject it, and also
	 * find out which AF_LINK address this maps to, if it isn't one
	 * already.
	 */
	if (ifp->if_resolvemulti) {
		error = ifp->if_resolvemulti(ifp, &llsa, sa);
		if (error) return error;
	} else {
		llsa = 0;
	}

	MALLOC(ifma, struct ifmultiaddr *, sizeof *ifma, M_IFMADDR, M_WAITOK);
	MALLOC(dupsa, struct sockaddr *, sa->sa_len, M_IFMADDR, M_WAITOK);
	bcopy(sa, dupsa, sa->sa_len);

	ifma->ifma_addr = dupsa;
	ifma->ifma_lladdr = llsa;
	ifma->ifma_ifp = ifp;
	ifma->ifma_refcount = 1;
	ifma->ifma_protospec = 0;
	rt_newmaddrmsg(RTM_NEWMADDR, ifma);

	/*
	 * Some network interfaces can scan the address list at
	 * interrupt time; lock them out.
	 */
	s = splimp();
	LIST_INSERT_HEAD(&ifp->if_multiaddrs, ifma, ifma_link);
	splx(s);
	*retifma = ifma;

	if (llsa != 0) {
		for (ifma = ifp->if_multiaddrs.lh_first; ifma;
		     ifma = ifma->ifma_link.le_next) {
			if (equal(ifma->ifma_addr, llsa))
				break;
		}
		if (ifma) {
			ifma->ifma_refcount++;
		} else {
			MALLOC(ifma, struct ifmultiaddr *, sizeof *ifma,
			       M_IFMADDR, M_WAITOK);
			MALLOC(dupsa, struct sockaddr *, llsa->sa_len,
			       M_IFMADDR, M_WAITOK);
			bcopy(llsa, dupsa, llsa->sa_len);
			ifma->ifma_addr = dupsa;
			ifma->ifma_ifp = ifp;
			ifma->ifma_refcount = 1;
			s = splimp();
			LIST_INSERT_HEAD(&ifp->if_multiaddrs, ifma, ifma_link);
			splx(s);
		}
	}
	/*
	 * We are certain we have added something, so call down to the
	 * interface to let them know about it.
	 */
	s = splimp();
	ifp->if_ioctl(ifp, SIOCADDMULTI, 0);
	splx(s);

	return 0;
}

/*
 * Remove a reference to a multicast address on this interface.  Yell
 * if the request does not match an existing membership.
 */
int
if_delmulti(ifp, sa)
	struct ifnet *ifp;
	struct sockaddr *sa;
{
	struct ifmultiaddr *ifma;
	int s;

	for (ifma = ifp->if_multiaddrs.lh_first; ifma;
	     ifma = ifma->ifma_link.le_next)
		if (equal(sa, ifma->ifma_addr))
			break;
	if (ifma == 0)
		return ENOENT;

	if (ifma->ifma_refcount > 1) {
		ifma->ifma_refcount--;
		return 0;
	}

	rt_newmaddrmsg(RTM_DELMADDR, ifma);
	sa = ifma->ifma_lladdr;
	s = splimp();
	LIST_REMOVE(ifma, ifma_link);
	/*
	 * Make sure the interface driver is notified
	 * in the case of a link layer mcast group being left.
	 */
	if (ifma->ifma_addr->sa_family == AF_LINK && sa == 0)
		ifp->if_ioctl(ifp, SIOCDELMULTI, 0);
	splx(s);
	free(ifma->ifma_addr, M_IFMADDR);
	free(ifma, M_IFMADDR);
	if (sa == 0)
		return 0;

	/*
	 * Now look for the link-layer address which corresponds to
	 * this network address.  It had been squirreled away in
	 * ifma->ifma_lladdr for this purpose (so we don't have
	 * to call ifp->if_resolvemulti() again), and we saved that
	 * value in sa above.  If some nasty deleted the
	 * link-layer address out from underneath us, we can deal because
	 * the address we stored was is not the same as the one which was
	 * in the record for the link-layer address.  (So we don't complain
	 * in that case.)
	 */
	for (ifma = ifp->if_multiaddrs.lh_first; ifma;
	     ifma = ifma->ifma_link.le_next)
		if (equal(sa, ifma->ifma_addr))
			break;
	if (ifma == 0)
		return 0;

	if (ifma->ifma_refcount > 1) {
		ifma->ifma_refcount--;
		return 0;
	}

	s = splimp();
	LIST_REMOVE(ifma, ifma_link);
	ifp->if_ioctl(ifp, SIOCDELMULTI, 0);
	splx(s);
	free(ifma->ifma_addr, M_IFMADDR);
	free(sa, M_IFMADDR);
	free(ifma, M_IFMADDR);

	return 0;
}

/*
 * Set the link layer address on an interface.
 *
 * At this time we only support certain types of interfaces,
 * and we don't allow the length of the address to change.
 */
int
if_setlladdr(struct ifnet *ifp, const u_char *lladdr, int len)
{
	struct sockaddr_dl *sdl;
	struct ifaddr *ifa;

	ifa = ifnet_addrs[ifp->if_index - 1];
	if (ifa == NULL)
		return (EINVAL);
	sdl = (struct sockaddr_dl *)ifa->ifa_addr;
	if (sdl == NULL)
		return (EINVAL);
	if (len != sdl->sdl_alen)	/* don't allow length to change */
		return (EINVAL);
	switch (ifp->if_type) {
	case IFT_ETHER:			/* these types use struct arpcom */
	case IFT_FDDI:
	case IFT_XETHER:
	case IFT_ISO88025:
	case IFT_L2VLAN:
		bcopy(lladdr, ((struct arpcom *)ifp->if_softc)->ac_enaddr, len);
		bcopy(lladdr, LLADDR(sdl), len);
		break;
	default:
		return (ENODEV);
	}
	/*
	 * If the interface is already up, we need
	 * to re-init it in order to reprogram its
	 * address filter.
	 */
	if ((ifp->if_flags & IFF_UP) != 0) {
		ifp->if_flags &= ~IFF_UP;
		(*ifp->if_ioctl)(ifp, SIOCSIFFLAGS, NULL);
		ifp->if_flags |= IFF_UP;
		(*ifp->if_ioctl)(ifp, SIOCSIFFLAGS, NULL);
	}
	return (0);
}

struct ifmultiaddr *
ifmaof_ifpforaddr(sa, ifp)
	struct sockaddr *sa;
	struct ifnet *ifp;
{
	struct ifmultiaddr *ifma;
	
	for (ifma = ifp->if_multiaddrs.lh_first; ifma;
	     ifma = ifma->ifma_link.le_next)
		if (equal(ifma->ifma_addr, sa))
			break;

	return ifma;
}

SYSCTL_NODE(_net, PF_LINK, link, CTLFLAG_RW, 0, "Link layers");
SYSCTL_NODE(_net_link, 0, generic, CTLFLAG_RW, 0, "Generic link-management");