Exemplo n.º 1
0
static void
configure_interface1(struct interface *ifp)
{
	struct if_options *ifo = ifp->options;
	int ra_global, ra_iface;

	/* Do any platform specific configuration */
	if_conf(ifp);

	if (ifp->flags & IFF_POINTOPOINT && !(ifo->options & DHCPCD_INFORM))
		ifo->options |= DHCPCD_STATIC;
	if (ifp->flags & IFF_NOARP ||
	    ifo->options & (DHCPCD_INFORM | DHCPCD_STATIC))
		ifo->options &= ~(DHCPCD_ARP | DHCPCD_IPV4LL);
	if (!(ifp->flags & (IFF_POINTOPOINT | IFF_LOOPBACK | IFF_MULTICAST)))
		ifo->options &= ~DHCPCD_IPV6RS;
	if (ifo->options & DHCPCD_LINK && carrier_status(ifp) == LINK_UNKNOWN)
		ifo->options &= ~DHCPCD_LINK;

	if (ifo->metric != -1)
		ifp->metric = ifo->metric;

	/* We want to disable kernel interface RA as early as possible. */
	if (ifo->options & DHCPCD_IPV6RS) {
		ra_global = check_ipv6(NULL, options & DHCPCD_IPV6RA_OWN ? 1:0);
		ra_iface = check_ipv6(ifp->name,
		    ifp->options->options & DHCPCD_IPV6RA_OWN ? 1 : 0);
		if (ra_global == -1 || ra_iface == -1)
			ifo->options &= ~DHCPCD_IPV6RS;
		else if (ra_iface == 0)
			ifo->options |= DHCPCD_IPV6RA_OWN;
	}

	/* If we haven't specified a ClientID and our hardware address
	 * length is greater than DHCP_CHADDR_LEN then we enforce a ClientID
	 * of the hardware address family and the hardware address. */
	if (ifp->hwlen > DHCP_CHADDR_LEN)
		ifo->options |= DHCPCD_CLIENTID;

	/* Firewire and InfiniBand interfaces require ClientID and
	 * the broadcast option being set. */
	switch (ifp->family) {
	case ARPHRD_IEEE1394:	/* FALLTHROUGH */
	case ARPHRD_INFINIBAND:
		ifo->options |= DHCPCD_CLIENTID | DHCPCD_BROADCAST;
		break;
	}
}
Exemplo n.º 2
0
static void
configure_interface1(struct interface *ifp)
{
	struct if_options *ifo = ifp->options;
	int ra_global, ra_iface;

	/* Do any platform specific configuration */
	if_conf(ifp);

	if (ifp->flags & IFF_POINTOPOINT && !(ifo->options & DHCPCD_INFORM))
		ifo->options |= DHCPCD_STATIC;
	if (ifp->flags & IFF_NOARP ||
	    ifo->options & (DHCPCD_INFORM | DHCPCD_STATIC))
		ifo->options &= ~(DHCPCD_ARP | DHCPCD_IPV4LL);
	if (!(ifp->flags & (IFF_POINTOPOINT | IFF_LOOPBACK | IFF_MULTICAST)))
		ifo->options &= ~DHCPCD_IPV6RS;
	if (ifo->options & DHCPCD_LINK && carrier_status(ifp) == LINK_UNKNOWN)
		ifo->options &= ~DHCPCD_LINK;

	if (ifo->metric != -1)
		ifp->metric = ifo->metric;

	if (!(ifo->options & DHCPCD_IPV6))
		ifo->options &= ~DHCPCD_IPV6RS;

	/* We want to disable kernel interface RA as early as possible. */
	if (ifo->options & DHCPCD_IPV6RS) {
		ra_global = check_ipv6(NULL, options & DHCPCD_IPV6RA_OWN ? 1:0);
		ra_iface = check_ipv6(ifp->name,
		    ifp->options->options & DHCPCD_IPV6RA_OWN ? 1 : 0);
		if (ra_global == -1 || ra_iface == -1)
			ifo->options &= ~DHCPCD_IPV6RS;
		else if (ra_iface == 0)
			ifo->options |= DHCPCD_IPV6RA_OWN;
	}

	/* If we haven't specified a ClientID and our hardware address
	 * length is greater than DHCP_CHADDR_LEN then we enforce a ClientID
	 * of the hardware address family and the hardware address. */
	if (ifp->hwlen > DHCP_CHADDR_LEN)
		ifo->options |= DHCPCD_CLIENTID;

	/* Firewire and InfiniBand interfaces require ClientID and
	 * the broadcast option being set. */
	switch (ifp->family) {
	case ARPHRD_IEEE1394:	/* FALLTHROUGH */
	case ARPHRD_INFINIBAND:
		ifo->options |= DHCPCD_CLIENTID | DHCPCD_BROADCAST;
		break;
	}

	if (!(ifo->options & DHCPCD_IAID)) {
		/*
		 * An IAID is for identifying a unqiue interface within
		 * the client. It is 4 bytes long. Working out a default
		 * value is problematic.
		 *
		 * Interface name and number are not stable
		 * between different OS's. Some OS's also cannot make
		 * up their mind what the interface should be called
		 * (yes, udev, I'm looking at you).
		 * Also, the name could be longer than 4 bytes.
		 * Also, with pluggable interfaces the name and index
		 * could easily get swapped per actual interface.
		 *
		 * The MAC address is 6 bytes long, the final 3
		 * being unique to the manufacturer and the initial 3
		 * being unique to the organisation which makes it.
		 * We could use the last 4 bytes of the MAC address
		 * as the IAID as it's the most stable part given the
		 * above, but equally it's not guaranteed to be
		 * unique.
		 *
		 * Given the above, and our need to reliably work
		 * between reboots without persitent storage,
		 * generating the IAID from the MAC address is the only
		 * logical default.
		 *
		 * dhclient uses the last 4 bytes of the MAC address.
		 * dibbler uses an increamenting counter.
		 * wide-dhcpv6 uses 0 or a configured value.
		 * odhcp6c uses 1.
		 * Windows 7 uses the first 3 bytes of the MAC address
		 * and an unknown byte.
		 * dhcpcd-6.1.0 and earlier used the interface name,
		 * falling back to interface index if name > 4.
		 */
		memcpy(ifo->iaid, ifp->hwaddr + ifp->hwlen - sizeof(ifo->iaid),
		    sizeof(ifo->iaid));
#if 0
		len = strlen(ifp->name);
		if (len <= sizeof(ifo->iaid)) {
			memcpy(ifo->iaid, ifp->name, len);
			memset(ifo->iaid + len, 0, sizeof(ifo->iaid) - len);
		} else {
			/* IAID is the same size as a uint32_t */
			len = htonl(ifp->index);
			memcpy(ifo->iaid, &len, sizeof(len));
		}
#endif
		ifo->options |= DHCPCD_IAID;
	}

#ifdef INET6
	if (ifo->ia == NULL && ifo->options & DHCPCD_IPV6) {
		ifo->ia = malloc(sizeof(*ifo->ia));
		if (ifo->ia == NULL)
			syslog(LOG_ERR, "%s: %m", __func__);
		else {
			if (ifo->ia_type == 0)
				ifo->ia_type = D6_OPTION_IA_NA;
			memcpy(ifo->ia->iaid, ifo->iaid, sizeof(ifo->iaid));
			ifo->ia_len = 1;
			ifo->ia->sla = NULL;
			ifo->ia->sla_len = 0;
		}
	}
#endif
}