in6_ifattach.c

来自「eCos操作系统源码」· C语言 代码 · 共 1,344 行 · 第 1/3 页

		 * card insertion.
		 */
		if (bcmp(addr, allzero, addrlen) == 0)
			return -1;
		if (bcmp(addr, allone, addrlen) == 0)
			return -1;

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

	case IFT_ARCNET:
		if (addrlen != 1)
			return -1;
		if (!addr[0])
			return -1;

		bzero(&in6->s6_addr[8], 8);
		in6->s6_addr[15] = addr[0];

		/*
		 * due to insufficient bitwidth, we mark it local.
		 */
		in6->s6_addr[8] &= ~EUI64_GBIT;	/* g bit to "individual" */
		in6->s6_addr[8] |= EUI64_UBIT;	/* u bit to "local" */
		break;

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

	default:
		return -1;
	}

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

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

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

	return 0;
}

/*
 * Get interface identifier for the specified interface.  If it is not
 * available on ifp0, borrow interface identifier from other information
 * sources.
 */
#ifdef MIP6
int
#else /* MIP6 */
static int
#endif /* MIP6 */
get_ifid(ifp0, altifp, in6)
	struct ifnet *ifp0;
	struct ifnet *altifp;	/* secondary EUI64 source */
	struct in6_addr *in6;
{
	struct ifnet *ifp;

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

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

	/* next, try to get it from some other hardware interface */
#if defined(__bsdi__) || (defined(__FreeBSD__) && __FreeBSD__ < 3)
	for (ifp = ifnet; ifp; ifp = ifp->if_next)
#else
	for (ifp = ifnet.tqh_first; ifp; ifp = ifp->if_list.tqe_next)
#endif
	{
		if (ifp == ifp0)
			continue;
		if (get_hw_ifid(ifp, in6) != 0)
			continue;

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

#if defined(__NetBSD__) || defined(__OpenBSD__)
	/* get from hostid - only for certain architectures */
	if (0 && get_hostid_ifid(ifp, in6) == 0) {
		nd6log((LOG_DEBUG,
		    "%s: interface identifier generated by hostid\n",
		    if_name(ifp0)));
		goto success;
	}
#endif

	/* last resort: get from random number source */
	if (get_rand_ifid(ifp, in6) == 0) {
		nd6log((LOG_DEBUG,
		    "%s: interface identifier generated by random number\n",
		    if_name(ifp0)));
		goto success;
	}

	printf("%s: failed to get interface identifier\n", if_name(ifp0));
	return -1;

success:
	nd6log((LOG_INFO, "%s: ifid: "
		"%02x:%02x:%02x:%02x:%02x:%02x:%02x:%02x\n",
		if_name(ifp0),
		in6->s6_addr[8], in6->s6_addr[9],
		in6->s6_addr[10], in6->s6_addr[11],
		in6->s6_addr[12], in6->s6_addr[13],
		in6->s6_addr[14], in6->s6_addr[15]));
	return 0;
}

#ifdef __ECOS
extern void _show_ifp(struct ifnet *ifp);
#endif

static int
in6_ifattach_linklocal(ifp, altifp)
	struct ifnet *ifp;
	struct ifnet *altifp;	/* secondary EUI64 source */
{
	struct in6_ifaddr *ia;
	struct in6_aliasreq ifra;
	struct nd_prefix pr0;
	int i, error;
#ifdef SCOPEDROUTING
	int64_t zoneid;
#endif

	/*
	 * configure link-local address.
	 */
	bzero(&ifra, sizeof(ifra));

	/*
	 * in6_update_ifa() does not use ifra_name, but we accurately set it
	 * for safety.
	 */
	strncpy(ifra.ifra_name, if_name(ifp), sizeof(ifra.ifra_name));

	ifra.ifra_addr.sin6_family = AF_INET6;
	ifra.ifra_addr.sin6_len = sizeof(struct sockaddr_in6);
	ifra.ifra_addr.sin6_addr.s6_addr16[0] = htons(0xfe80);
#ifdef SCOPEDROUTING
	ifra.ifra_addr.sin6_addr.s6_addr16[1] = 0
#else
	ifra.ifra_addr.sin6_addr.s6_addr16[1] = htons(ifp->if_index); /* XXX */
#endif
	ifra.ifra_addr.sin6_addr.s6_addr32[1] = 0;
	if ((ifp->if_flags & IFF_LOOPBACK) != 0) {
		ifra.ifra_addr.sin6_addr.s6_addr32[2] = 0;
		ifra.ifra_addr.sin6_addr.s6_addr32[3] = htonl(1);
	} else {
		if (get_ifid(ifp, altifp, &ifra.ifra_addr.sin6_addr) != 0) {
			nd6log((LOG_ERR,
			    "%s: no ifid available\n", if_name(ifp)));
			return(-1);
		}
	}
#ifdef SCOPEDROUTING
	if ((zoneid = in6_addr2zoneid(ifp, &ifra.ifra_addr.sin6_addr)) < 0)
		return(-1);
	ifra.ifra_addr.sin6_scope_id = zoneid;
#endif

	ifra.ifra_prefixmask.sin6_len = sizeof(struct sockaddr_in6);
	ifra.ifra_prefixmask.sin6_family = AF_INET6;
	ifra.ifra_prefixmask.sin6_addr = in6mask64;
#ifdef SCOPEDROUTING
	/* take into account the sin6_scope_id field for routing */
	ifra.ifra_prefixmask.sin6_scope_id = 0xffffffff;
#endif
	/* link-local addresses should NEVER expire. */
	ifra.ifra_lifetime.ia6t_vltime = ND6_INFINITE_LIFETIME;
	ifra.ifra_lifetime.ia6t_pltime = ND6_INFINITE_LIFETIME;

	/*
	 * Do not let in6_update_ifa() do DAD, since we need a random delay
	 * before sending an NS at the first time the interface becomes up.
	 * Instead, in6_if_up() will start DAD with a proper random delay.
	 */
	ifra.ifra_flags |= IN6_IFF_NODAD;

	/*
	 * Now call in6_update_ifa() to do a bunch of procedures to configure
	 * a link-local address. We can set NULL to the 3rd argument, because
	 * we know there's no other link-local address on the interface
	 * and therefore we are adding one (instead of updating one).
	 */
	if ((error = in6_update_ifa(ifp, &ifra, NULL)) != 0) {
		/*
		 * XXX: When the interface does not support IPv6, this call
		 * would fail in the SIOCSIFADDR ioctl.  I believe the
		 * notification is rather confusing in this case, so just
		 * suppress it.  ([e-mail] 20010130)
		 */
		if (error != EAFNOSUPPORT)
			log(LOG_NOTICE, "in6_ifattach_linklocal: failed to "
			    "configure a link-local address on %s "
			    "(errno=%d)\n",
			    if_name(ifp), error);
		return(-1);
	}

	/*
	 * Adjust ia6_flags so that in6_if_up will perform DAD.
	 * XXX: Some P2P interfaces seem not to send packets just after
	 * becoming up, so we skip p2p interfaces for safety.
	 */
	ia = in6ifa_ifpforlinklocal(ifp, 0); /* ia must not be NULL */
#ifdef DIAGNOSTIC
	if (!ia) {
		panic("ia == NULL in in6_ifattach_linklocal");
		/* NOTREACHED */
	}
#endif
	if (in6if_do_dad(ifp) && (ifp->if_flags & IFF_POINTOPOINT) == 0) {
		ia->ia6_flags &= ~IN6_IFF_NODAD;
		ia->ia6_flags |= IN6_IFF_TENTATIVE;
	}

	/*
	 * Make the link-local prefix (fe80::/64%link) as on-link.
	 * Since we'd like to manage prefixes separately from addresses,
	 * we make an ND6 prefix structure for the link-local prefix,
	 * and add it to the prefix list as a never-expire prefix.
	 * XXX: this change might affect some existing code base...
	 */
	bzero(&pr0, sizeof(pr0));
	pr0.ndpr_ifp = ifp;
	/* this should be 64 at this moment. */
	pr0.ndpr_plen = in6_mask2len(&ifra.ifra_prefixmask.sin6_addr, NULL);
	pr0.ndpr_mask = ifra.ifra_prefixmask.sin6_addr;
	pr0.ndpr_prefix = ifra.ifra_addr;
	/* apply the mask for safety. (nd6_prelist_add will apply it again) */
	for (i = 0; i < 4; i++) {
		pr0.ndpr_prefix.sin6_addr.s6_addr32[i] &=
			in6mask64.s6_addr32[i];
	}
	/*
	 * Initialize parameters.  The link-local prefix must always be
	 * on-link, and its lifetimes never expire.
	 */
	pr0.ndpr_raf_onlink = 1;
	pr0.ndpr_raf_auto = 1;	/* probably meaningless */
	pr0.ndpr_vltime = ND6_INFINITE_LIFETIME;
	pr0.ndpr_pltime = ND6_INFINITE_LIFETIME;
	/*
	 * Since there is no other link-local addresses, nd6_prefix_lookup()
	 * probably returns NULL.  However, we cannot always expect the result.
	 * For example, if we first remove the (only) existing link-local
	 * address, and then reconfigure another one, the prefix is still
	 * valid with referring to the old link-local address.
	 */
	if (nd6_prefix_lookup(&pr0) == NULL) {
		if ((error = nd6_prelist_add(&pr0, NULL, NULL)) != 0)
			return(error);
	}

        log_(LOG_ADDR) {
            diag_printf("%s.%d\n", __FUNCTION__, __LINE__);
            _show_ifp(ifp);
        }
	return 0;
}

static int
in6_ifattach_loopback(ifp)
	struct ifnet *ifp;	/* must be IFT_LOOP */
{
	struct in6_aliasreq ifra;
	int error;

	bzero(&ifra, sizeof(ifra));

	/*
	 * in6_update_ifa() does not use ifra_name, but we accurately set it
	 * for safety.
	 */
	strncpy(ifra.ifra_name, if_name(ifp), sizeof(ifra.ifra_name));

	ifra.ifra_prefixmask.sin6_len = sizeof(struct sockaddr_in6);
	ifra.ifra_prefixmask.sin6_family = AF_INET6;
	ifra.ifra_prefixmask.sin6_addr = in6mask128;

	/*
	 * Always initialize ia_dstaddr (= broadcast address) to loopback
	 * address.  Follows IPv4 practice - see in_ifinit().
	 */
	ifra.ifra_dstaddr.sin6_len = sizeof(struct sockaddr_in6);
	ifra.ifra_dstaddr.sin6_family = AF_INET6;
	ifra.ifra_dstaddr.sin6_addr = in6addr_loopback;

	ifra.ifra_addr.sin6_len = sizeof(struct sockaddr_in6);
	ifra.ifra_addr.sin6_family = AF_INET6;
	ifra.ifra_addr.sin6_addr = in6addr_loopback;

	/* the loopback  address should NEVER expire. */
	ifra.ifra_lifetime.ia6t_vltime = ND6_INFINITE_LIFETIME;
	ifra.ifra_lifetime.ia6t_pltime = ND6_INFINITE_LIFETIME;

	/* we don't need to perform DAD on loopback interfaces. */
	ifra.ifra_flags |= IN6_IFF_NODAD;

	/*
	 * We are sure that this is a newly assigned address, so we can set
	 * NULL to the 3rd arg.
	 */
	if ((error = in6_update_ifa(ifp, &ifra, NULL)) != 0) {
		log(LOG_ERR, "in6_ifattach_loopback: failed to configure "
		    "the loopback address on %s (errno=%d)\n",
		    if_name(ifp), error);
		return(-1);
	}

	return 0;
}

/*
 * compute NI group address, based on the current hostname setting.
 * see draft-ietf-ipngwg-icmp-name-lookup-* (04 and later).
 *
 * when ifp == NULL, the caller is responsible for filling scopeid.
 */
int
in6_nigroup(ifp, name, namelen, in6)
	struct ifnet *ifp;
	const char *name;
	int namelen;
	struct in6_addr *in6;
{
	const char *p;
	u_char *q;
	MD5_CTX ctxt;
	u_int8_t digest[16];
	char l;
	char n[64];	/* a single label must not exceed 63 chars */

	if (!namelen || !name)
		return -1;

	p = name;
	while (p && *p && *p != '.' && p - name < namelen)
		p++;
	if (p - name > sizeof(n) - 1)
		return -1;	/* label too long */
	l = p - name;
	strncpy(n, name, l);
	n[(int)l] = '\0';
	for (q = n; *q; q++) {
		if ('A' <= *q && *q <= 'Z')
			*q = *q - 'A' + 'a';
	}

	/* generate 8 bytes of pseudo-random value. */
	bzero(&ctxt, sizeof(ctxt));
	MD5Init(&ctxt);
	MD5Update(&ctxt, &l, sizeof(l));
	MD5Update(&ctxt, n, l);
	MD5Final(digest, &ctxt);

	bzero(in6, sizeof(*in6));
	in6->s6_addr16[0] = htons(0xff02);
	if (ifp)
		in6->s6_addr16[1] = htons(ifp->if_index);
	in6->s6_addr8[11] = 2;
	bcopy(digest, &in6->s6_addr32[3], sizeof(in6->s6_addr32[3]));

	return 0;
}

#if 0
void
in6_nigroup_attach(name, namelen)
	const char *name;
	int namelen;
{
	struct ifnet *ifp;
	struct sockaddr_in6 mltaddr;
	struct in6_multi *in6m;
	int error;

	bzero(&mltaddr, sizeof(mltaddr));
	mltaddr.sin6_family = AF_INET6;
	mltaddr.sin6_len = sizeof(struct sockaddr_in6);
	if (in6_nigroup(NULL, name, namelen, &mltaddr.sin6_addr) != 0)
		return;

#if defined(__bsdi__) || (defined(__FreeBSD__) && __FreeBSD__ < 3)
	for (ifp = ifnet; ifp; ifp = ifp->if_next)
#else
	for (ifp = ifnet.tqh_first; ifp; ifp = ifp->if_list.tqe_next)
#endif
	{
		mltaddr.sin6_addr.s6_addr16[1] = htons(ifp->if_index);
		IN6_LOOKUP_MULTI(mltaddr.sin6_addr, ifp, in6m);
		if (!in6m) {
			if (!in6_addmulti(&mltaddr.sin6_addr, ifp, &error)) {
				nd6log((LOG_ERR, "%s: failed to join %s "
				    "(errno=%d)\n", if_name(ifp),