Differential D19111 Diff 54169 sys/netinet6/in6_ifattach.c

Changeset View

Standalone View

sys/netinet6/in6_ifattach.c

	Show First 20 Lines • Show All 234 Lines • ▼ Show 20 Lines
	* Get interface identifier for the specified interface.			* Get interface identifier for the specified interface.
	* XXX assumes single sockaddr_dl (AF_LINK address) per an interface			* XXX assumes single sockaddr_dl (AF_LINK address) per an interface
	*			*
	* in6 - upper 64bits are preserved			* in6 - upper 64bits are preserved
	*/			*/
	int			int
	in6_get_hw_ifid(struct ifnet ifp, struct in6_addr in6)			in6_get_hw_ifid(struct ifnet ifp, struct in6_addr in6)
	{			{
	struct epoch_tracker et;
	struct ifaddr *ifa;			struct ifaddr *ifa;
	struct sockaddr_dl *sdl;			struct sockaddr_dl *sdl;
	u_int8_t *addr;			u_int8_t *addr;
	size_t addrlen;			size_t addrlen;
	static u_int8_t allzero[8] = { 0, 0, 0, 0, 0, 0, 0, 0 };			static u_int8_t allzero[8] = { 0, 0, 0, 0, 0, 0, 0, 0 };
	static u_int8_t allone[8] =			static u_int8_t allone[8] =
	{ 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff };			{ 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff };

	NET_EPOCH_ENTER(et);			NET_EPOCH_ASSERT();

	CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {			CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
	if (ifa->ifa_addr->sa_family != AF_LINK)			if (ifa->ifa_addr->sa_family != AF_LINK)
	continue;			continue;
	sdl = (struct sockaddr_dl *)ifa->ifa_addr;			sdl = (struct sockaddr_dl *)ifa->ifa_addr;
	if (sdl == NULL)			if (sdl == NULL)
	continue;			continue;
	if (sdl->sdl_alen == 0)			if (sdl->sdl_alen == 0)
	continue;			continue;

	goto found;			goto found;
	}			}
	NET_EPOCH_EXIT(et);

	return -1;			return -1;

	found:			found:
	IF_ADDR_LOCK_ASSERT(ifp);
	addr = LLADDR(sdl);			addr = LLADDR(sdl);
	addrlen = sdl->sdl_alen;			addrlen = sdl->sdl_alen;

	/* get EUI64 */			/* get EUI64 */
	switch (ifp->if_type) {			switch (ifp->if_type) {
	case IFT_BRIDGE:			case IFT_BRIDGE:
	case IFT_ETHER:			case IFT_ETHER:
	case IFT_L2VLAN:			case IFT_L2VLAN:
	case IFT_ATM:			case IFT_ATM:
	case IFT_IEEE1394:			case IFT_IEEE1394:
	/* IEEE802/EUI64 cases - what others? */			/* IEEE802/EUI64 cases - what others? */
	/* IEEE1394 uses 16byte length address starting with EUI64 */			/* IEEE1394 uses 16byte length address starting with EUI64 */
	if (addrlen > 8)			if (addrlen > 8)
	addrlen = 8;			addrlen = 8;

	/* look at IEEE802/EUI64 only */			/* look at IEEE802/EUI64 only */
	if (addrlen != 8 && addrlen != 6) {			if (addrlen != 8 && addrlen != 6)
	NET_EPOCH_EXIT(et);
	return -1;			return -1;
	}

	/*			/*
	* check for invalid MAC address - on bsdi, we see it a lot			* check for invalid MAC address - on bsdi, we see it a lot
	* since wildboar configures all-zero MAC on pccard before			* since wildboar configures all-zero MAC on pccard before
	* card insertion.			* card insertion.
	*/			*/
	if (bcmp(addr, allzero, addrlen) == 0) {			if (bcmp(addr, allzero, addrlen) == 0)
	NET_EPOCH_EXIT(et);
	return -1;			return -1;
	}			if (bcmp(addr, allone, addrlen) == 0)
	if (bcmp(addr, allone, addrlen) == 0) {
	NET_EPOCH_EXIT(et);
	return -1;			return -1;
	}

	/* make EUI64 address */			/* make EUI64 address */
	if (addrlen == 8)			if (addrlen == 8)
	bcopy(addr, &in6->s6_addr[8], 8);			bcopy(addr, &in6->s6_addr[8], 8);
	else if (addrlen == 6) {			else if (addrlen == 6) {
	in6->s6_addr[8] = addr[0];			in6->s6_addr[8] = addr[0];
	in6->s6_addr[9] = addr[1];			in6->s6_addr[9] = addr[1];
	in6->s6_addr[10] = addr[2];			in6->s6_addr[10] = addr[2];
	in6->s6_addr[11] = 0xff;			in6->s6_addr[11] = 0xff;
	in6->s6_addr[12] = 0xfe;			in6->s6_addr[12] = 0xfe;
	in6->s6_addr[13] = addr[3];			in6->s6_addr[13] = addr[3];
	in6->s6_addr[14] = addr[4];			in6->s6_addr[14] = addr[4];
	in6->s6_addr[15] = addr[5];			in6->s6_addr[15] = addr[5];
	}			}
	break;			break;

	case IFT_GIF:			case IFT_GIF:
	case IFT_STF:			case IFT_STF:
	/*			/*
	* RFC2893 says: "SHOULD use IPv4 address as ifid source".			* RFC2893 says: "SHOULD use IPv4 address as ifid source".
	* however, IPv4 address is not very suitable as unique			* however, IPv4 address is not very suitable as unique
	* identifier source (can be renumbered).			* identifier source (can be renumbered).
	* we don't do this.			* we don't do this.
	*/			*/
	NET_EPOCH_EXIT(et);
	return -1;			return -1;

	default:			default:
	NET_EPOCH_EXIT(et);
	return -1;			return -1;
	}			}

	/* sanity check: g bit must not indicate "group" */			/* sanity check: g bit must not indicate "group" */
	if (EUI64_GROUP(in6)) {			if (EUI64_GROUP(in6))
	NET_EPOCH_EXIT(et);
	return -1;			return -1;
	}

	/* convert EUI64 into IPv6 interface identifier */			/* convert EUI64 into IPv6 interface identifier */
	EUI64_TO_IFID(in6);			EUI64_TO_IFID(in6);

	/*			/*
	* sanity check: ifid must not be all zero, avoid conflict with			* sanity check: ifid must not be all zero, avoid conflict with
	* subnet router anycast			* subnet router anycast
	*/			*/
	if ((in6->s6_addr[8] & ~(EUI64_GBIT \| EUI64_UBIT)) == 0x00 &&			if ((in6->s6_addr[8] & ~(EUI64_GBIT \| EUI64_UBIT)) == 0x00 &&
	bcmp(&in6->s6_addr[9], allzero, 7) == 0) {			bcmp(&in6->s6_addr[9], allzero, 7) == 0)
	NET_EPOCH_EXIT(et);
	return -1;			return -1;
	}

	NET_EPOCH_EXIT(et);
	return 0;			return 0;
	}			}

	/*			/*
	* Get interface identifier for the specified interface. If it is not			* Get interface identifier for the specified interface. If it is not
	* available on ifp0, borrow interface identifier from other information			* available on ifp0, borrow interface identifier from other information
	* sources.			* sources.
	*			*
	* altifp - secondary EUI64 source			* altifp - secondary EUI64 source
	*/			*/
	static int			static int
	get_ifid(struct ifnet ifp0, struct ifnet altifp,			get_ifid(struct ifnet ifp0, struct ifnet altifp,
	struct in6_addr *in6)			struct in6_addr *in6)
	{			{
	struct epoch_tracker et;
	struct ifnet *ifp;			struct ifnet *ifp;

				NET_EPOCH_ASSERT();

	/* first, try to get it from the interface itself */			/* first, try to get it from the interface itself */
	if (in6_get_hw_ifid(ifp0, in6) == 0) {			if (in6_get_hw_ifid(ifp0, in6) == 0) {
	nd6log((LOG_DEBUG, "%s: got interface identifier from itself\n",			nd6log((LOG_DEBUG, "%s: got interface identifier from itself\n",
	if_name(ifp0)));			if_name(ifp0)));
	goto success;			goto success;
	}			}

	/* try secondary EUI64 source. this basically is for ATM PVC */			/* try secondary EUI64 source. this basically is for ATM PVC */
	if (altifp && in6_get_hw_ifid(altifp, in6) == 0) {			if (altifp && in6_get_hw_ifid(altifp, in6) == 0) {
	nd6log((LOG_DEBUG, "%s: got interface identifier from %s\n",			nd6log((LOG_DEBUG, "%s: got interface identifier from %s\n",
	if_name(ifp0), if_name(altifp)));			if_name(ifp0), if_name(altifp)));
	goto success;			goto success;
	}			}

	/* next, try to get it from some other hardware interface */			/* next, try to get it from some other hardware interface */
	NET_EPOCH_ENTER(et);
	CK_STAILQ_FOREACH(ifp, &V_ifnet, if_link) {			CK_STAILQ_FOREACH(ifp, &V_ifnet, if_link) {
	if (ifp == ifp0)			if (ifp == ifp0)
	continue;			continue;
	if (in6_get_hw_ifid(ifp, in6) != 0)			if (in6_get_hw_ifid(ifp, in6) != 0)
	continue;			continue;

	/*			/*
	* to borrow ifid from other interface, ifid needs to be			* to borrow ifid from other interface, ifid needs to be
	* globally unique			* globally unique
	*/			*/
	if (IFID_UNIVERSAL(in6)) {			if (IFID_UNIVERSAL(in6)) {
	nd6log((LOG_DEBUG,			nd6log((LOG_DEBUG,
	"%s: borrow interface identifier from %s\n",			"%s: borrow interface identifier from %s\n",
	if_name(ifp0), if_name(ifp)));			if_name(ifp0), if_name(ifp)));
	NET_EPOCH_EXIT(et);
	goto success;			goto success;
	}			}
	}			}
	NET_EPOCH_EXIT(et);

	/* last resort: get from random number source */			/* last resort: get from random number source */
	if (get_rand_ifid(ifp, in6) == 0) {			if (get_rand_ifid(ifp, in6) == 0) {
	nd6log((LOG_DEBUG,			nd6log((LOG_DEBUG,
	"%s: interface identifier generated by random number\n",			"%s: interface identifier generated by random number\n",
	if_name(ifp0)));			if_name(ifp0)));
	goto success;			goto success;
	}			}
	▲ Show 20 Lines • Show All 256 Lines • ▼ Show 20 Lines
	* XXX multiple link-local address case			* XXX multiple link-local address case
	*			*
	* altifp - secondary EUI64 source			* altifp - secondary EUI64 source
	*/			*/
	void			void
	in6_ifattach(struct ifnet ifp, struct ifnet altifp)			in6_ifattach(struct ifnet ifp, struct ifnet altifp)
	{			{
	struct in6_ifaddr *ia;			struct in6_ifaddr *ia;

				NET_EPOCH_ASSERT();

	if (ifp->if_afdata[AF_INET6] == NULL)			if (ifp->if_afdata[AF_INET6] == NULL)
	return;			return;
	/*			/*
	* quirks based on interface type			* quirks based on interface type
	*/			*/
	switch (ifp->if_type) {			switch (ifp->if_type) {
	case IFT_STF:			case IFT_STF:
	▲ Show 20 Lines • Show All 212 Lines • Show Last 20 Lines