if.c

eCos操作系统源码

	count = (if_cloners_count < ifcr->ifcr_count) ?
	    if_cloners_count : ifcr->ifcr_count;

	for (ifc = LIST_FIRST(&if_cloners); ifc != NULL && count != 0;
	     ifc = LIST_NEXT(ifc, ifc_list), count--, dst += IFNAMSIZ) {
		strncpy(outbuf, ifc->ifc_name, IFNAMSIZ);
		outbuf[IFNAMSIZ - 1] = '\0';	/* sanity */
		error = copyout(outbuf, dst, IFNAMSIZ);
		if (error)
			break;
	}

	return (error);
}

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

#define	equal(a1, a2) \
  (bcmp((caddr_t)(a1), (caddr_t)(a2), ((struct sockaddr *)(a1))->sa_len) == 0)
	for (ifp = ifnet.tqh_first; ifp; ifp = ifp->if_link.tqe_next)
	    for (ifa = ifp->if_addrhead.tqh_first; ifa;
		 ifa = ifa->ifa_link.tqe_next) {
		if (ifa->ifa_addr->sa_family != addr->sa_family)
			continue;
		if (equal(addr, ifa->ifa_addr))
			return (ifa);
		if ((ifp->if_flags & IFF_BROADCAST) && ifa->ifa_broadaddr &&
		    /* IP6 doesn't have broadcast */
		    ifa->ifa_broadaddr->sa_len != 0 &&
		    equal(ifa->ifa_broadaddr, addr))
			return (ifa);
	}
	return ((struct ifaddr *)0);
}
/*
 * Locate the point to point interface with a given destination address.
 */
/*ARGSUSED*/
struct ifaddr *
ifa_ifwithdstaddr(addr)
	register struct sockaddr *addr;
{
	register struct ifnet *ifp;
	register struct ifaddr *ifa;

	for (ifp = ifnet.tqh_first; ifp; ifp = ifp->if_link.tqe_next)
	    if (ifp->if_flags & IFF_POINTOPOINT)
		for (ifa = ifp->if_addrhead.tqh_first; ifa;
		     ifa = ifa->ifa_link.tqe_next) {
			if (ifa->ifa_addr->sa_family != addr->sa_family)
				continue;
			if (ifa->ifa_dstaddr && equal(addr, ifa->ifa_dstaddr))
				return (ifa);
	}
	return ((struct ifaddr *)0);
}

/*
 * Find an interface on a specific network.  If many, choice
 * is most specific found.
 */
struct ifaddr *
ifa_ifwithnet(addr)
	struct sockaddr *addr;
{
	register struct ifnet *ifp;
	register struct ifaddr *ifa;
	struct ifaddr *ifa_maybe = (struct ifaddr *) 0;
	u_int af = addr->sa_family;
	char *addr_data = addr->sa_data, *cplim;

	/*
	 * AF_LINK addresses can be looked up directly by their index number,
	 * so do that if we can.
	 */
	if (af == AF_LINK) {
	    register struct sockaddr_dl *sdl = (struct sockaddr_dl *)addr;
	    if (sdl->sdl_index && sdl->sdl_index <= if_index)
		return (ifnet_addrs[sdl->sdl_index - 1]);
	}

	/*
	 * Scan though each interface, looking for ones that have
	 * addresses in this address family.
	 */
	for (ifp = ifnet.tqh_first; ifp; ifp = ifp->if_link.tqe_next) {
		for (ifa = ifp->if_addrhead.tqh_first; ifa;
		     ifa = ifa->ifa_link.tqe_next) {
			register char *cp, *cp2, *cp3;

			if (ifa->ifa_addr->sa_family != af)
next:				continue;
			if (
#ifdef INET6 /* XXX: for maching gif tunnel dst as routing entry gateway */
			    addr->sa_family != AF_INET6 &&
#endif
			    ifp->if_flags & IFF_POINTOPOINT) {
				/*
				 * This is a bit broken as it doesn't
				 * take into account that the remote end may
				 * be a single node in the network we are
				 * looking for.
				 * The trouble is that we don't know the
				 * netmask for the remote end.
				 */
				if (ifa->ifa_dstaddr != 0
				    && equal(addr, ifa->ifa_dstaddr))
 					return (ifa);
			} else {
				/*
				 * if we have a special address handler,
				 * then use it instead of the generic one.
				 */
	          		if (ifa->ifa_claim_addr) {
					if ((*ifa->ifa_claim_addr)(ifa, addr)) {
						return (ifa);
					} else {
						continue;
					}
				}

				/*
				 * Scan all the bits in the ifa's address.
				 * If a bit dissagrees with what we are
				 * looking for, mask it with the netmask
				 * to see if it really matters.
				 * (A byte at a time)
				 */
				if (ifa->ifa_netmask == 0)
					continue;
				cp = addr_data;
				cp2 = ifa->ifa_addr->sa_data;
				cp3 = ifa->ifa_netmask->sa_data;
				cplim = ifa->ifa_netmask->sa_len
					+ (char *)ifa->ifa_netmask;
				while (cp3 < cplim)
					if ((*cp++ ^ *cp2++) & *cp3++)
						goto next; /* next address! */
				/*
				 * If the netmask of what we just found
				 * is more specific than what we had before
				 * (if we had one) then remember the new one
				 * before continuing to search
				 * for an even better one.
				 */
				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 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 (0);
	for (ifa = ifp->if_addrhead.tqh_first; ifa;
	     ifa = ifa->ifa_link.tqe_next) {
		if (ifa->ifa_addr->sa_family != af)
			continue;
		if (ifa_maybe == 0)
			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;
		}
		if (ifp->if_flags & IFF_POINTOPOINT) {
			if (equal(addr, ifa->ifa_dstaddr))
				return (ifa);
		} else {
			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.
 */
static 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;
	ifa = ifaof_ifpforaddr(dst, ifp);
	if (ifa) {
		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 splnet or eqivalent.
 */
void
if_unroute(ifp, flag, fam)
	register struct ifnet *ifp;
	int flag, fam;
{
	register struct ifaddr *ifa;

	ifp->if_flags &= ~flag;
	getmicrotime(&ifp->if_lastchange);
	TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link)
		if (fam == PF_UNSPEC || (fam == ifa->ifa_addr->sa_family))
			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 splnet or eqivalent.
 */
void
if_route(ifp, flag, fam)
	register struct ifnet *ifp;
	int flag, fam;
{
	register struct ifaddr *ifa;

	ifp->if_flags |= flag;
	getmicrotime(&ifp->if_lastchange);
	TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link)
		if (fam == PF_UNSPEC || (fam == ifa->ifa_addr->sa_family))
			pfctlinput(PRC_IFUP, ifa->ifa_addr);
	rt_ifmsg(ifp);
#ifdef INET6
	in6_if_up(ifp);
#endif
}

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

	if_unroute(ifp, IFF_UP, AF_UNSPEC);
}

/*
 * Mark an interface up and notify protocols of
 * the transition.
 * NOTE: must be called at splnet or eqivalent.
 */
void
if_up(ifp)
	register struct ifnet *ifp;
{

	if_route(ifp, IFF_UP, AF_UNSPEC);
}

/*
 * Flush an interface queue.
 */
static void
if_qflush(ifq)
#ifdef ALTQ
	struct ifaltq *ifq;
#else
	register struct ifqueue *ifq;
#endif
{
	register struct mbuf *m, *n;

#ifdef ALTQ
	if (ALTQ_IS_ENABLED(ifq))
		ALTQ_PURGE(ifq);
#endif
	n = ifq->ifq_head;
	while ((m = n) != 0) {
		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.
 */
static void
if_slowtimo(arg)
	void *arg;
{
	register struct ifnet *ifp;
	int s = splimp();

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

/*
 * Map interface name to
 * interface structure pointer.
 */
struct ifnet *
ifunit(const char *name)
{
	char namebuf[IFNAMSIZ + 1];
	const char *cp;
	struct ifnet *ifp;
	int unit;
	unsigned len, m;
	char c;

	len = strlen(name);
	if (len < 2 || len > IFNAMSIZ)
		return NULL;
	cp = name + len - 1;
	c = *cp;
	if (c < '0' || c > '9')
		return NULL;		/* trailing garbage */
	unit = 0;
	m = 1;
	do {
		if (cp == name)
			return NULL;	/* no interface name */
		unit += (c - '0') * m;
		if (unit > 1000000)
			return NULL;	/* number is unreasonable */
		m *= 10;
		c = *--cp;
	} while (c >= '0' && c <= '9');
	len = cp - name + 1;
	bcopy(name, namebuf, len);
	namebuf[len] = '\0';
	/*
	 * Now search all the interfaces for this name/number
	 */
	for (ifp = ifnet.tqh_first; ifp; ifp = ifp->if_link.tqe_next) {
		if (strcmp(ifp->if_name, namebuf))
			continue;
		if (unit == ifp->if_unit)
			break;
	}
	return (ifp);
}


/*
 * 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);
}


// TEMP?
#define _NAME(s) \
  case s: return #s; break; 
char *
_ioctl_name(u_long cmd)
{
    static char unknown[32];

    switch (cmd) {
        _NAME(SIOCSHIWAT);
        _NAME(SIOCGHIWAT);
        _NAME(SIOCSLOWAT);
        _NAME(SIOCGLOWAT);
        _NAME(SIOCATMARK);
        _NAME(SIOCSPGRP);
        _NAME(SIOCGPGRP);
        _NAME(SIOCADDRT);
        _NAME(SIOCDELRT);
//_NAME(SIOCGETVIFCNT);
//_NAME(SIOCGETSGCNT);
        _NAME(SIOCSIFADDR);
        _NAME(OSIOCGIFADDR);
        _NAME(SIOCGIFADDR);
        _NAME(SIOCSIFDSTADDR);
        _NAME(OSIOCGIFDSTADDR);
        _NAME(SIOCGIFDSTADDR);
        _NAME(SIOCSIFFLAGS);
        _NAME(SIOCGIFFLAGS);
        _NAME(OSIOCGIFBRDADDR);
        _NAME(SIOCGIFBRDADDR);
        _NAME(SIOCSIFBRDADDR);
        _NAME(OSIOCGIFCONF);
        _NAME(SIOCGIFCONF);
        _NAME(OSIOCGIFNETMASK);
        _NAME(SIOCGIFNETMASK);
        _NAME(SIOCSIFNETMASK);
        _NAME(SIOCGIFMETRIC);
        _NAME(SIOCSIFMETRIC);
        _NAME(SIOCDIFADDR);
        _NAME(SIOCAIFADDR);
        _NAME(SIOCALIFADDR);
        _NAME(SIOCGLIFADDR);
        _NAME(SIOCDLIFADDR);
        _NAME(SIOCADDMULTI);
        _NAME(SIOCDELMULTI);
        _NAME(SIOCGIFMTU);
        _NAME(SIOCSIFMTU);
        _NAME(SIOCGIFPHYS);
        _NAME(SIOCSIFPHYS);
        _NAME(SIOCSIFMEDIA);
        _NAME(SIOCGIFMEDIA);
        _NAME(SIOCSIFPHYADDR  );
        _NAME(SIOCGIFPSRCADDR);
        _NAME(SIOCGIFPDSTADDR);
        _NAME(SIOCDIFPHYADDR);
        _NAME(SIOCSLIFPHYADDR);
        _NAME(SIOCGLIFPHYADDR);
        _NAME(SIOCSIFGENERIC);
        _NAME(SIOCGIFGENERIC);
        _NAME(SIOCGIFSTATUS);
        _NAME(SIOCSIFLLADDR);
        _NAME(SIOCIFCREATE);
        _NAME(SIOCIFDESTROY);
        _NAME(SIOCIFGCLONERS);
        _NAME(FIONBIO);
        _NAME(FIOASYNC);
        _NAME(FIONREAD);
        _NAME(SIOCGIFHWADDR);
        _NAME(SIOCSIFHWADDR);
        _NAME(SIOCGIFSTATSUD);
        _NAME(SIOCGIFSTATS);
    default:
        diag_sprintf(unknown, "0x%08x", cmd);
        return unknown;
    }
}
// TEMP?

/*
 * 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;
	struct ifstat *ifs;
	int error;
	short oif_flags;

        log(LOG_IOCTL, "%s: cmd: %s, data:\n", __FUNCTION__, _ioctl_name(cmd));
	switch (cmd) {

	case SIOCGIFCONF:
	case OSIOCGIFCONF:
		return (ifconf(cmd, data));
	}
	ifr = (struct ifreq *)data;

	switch (cmd) {
	case SIOCIFCREATE:
	case SIOCIFDESTROY:
		return ((cmd == SIOCIFCREATE) ?
			if_clone_create(ifr->ifr_name, sizeof(ifr->ifr_name)) :
			if_clone_destroy(ifr->ifr_name));
	
	case SIOCIFGCLONERS:
		return (if_clone_list((struct if_clonereq *)data));
	}

	ifp = ifunit(ifr->ifr_name);
	if (ifp == 0)
		return (ENXIO);
	switch (cmd) {

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

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

	case SIOCGIFMTU:
		ifr->ifr_mtu = ifp->if_mtu;
		break;

	case SIOCGIFPHYS:
		ifr->ifr_phys = ifp->if_physical;
		break;

	case SIOCSIFFLAGS:
		ifr->ifr_prevflags = ifp->if_flags;
		if (ifp->if_flags & IFF_SMART) {
			/* Smart drivers twiddle their own routes */
		} else if (ifp->if_flags & IFF_UP &&
		    (ifr->ifr_flags & IFF_UP) == 0) {
			int s = splimp();
			if_down(ifp);
			splx(s);