Ejemplos de ip_nat_used_tuple en C++ (Cpp)

Ejemplo n.º 1

Archivo: ip_nat_proto_gre.c Proyecto: iPodLinux/linux-2.4.24-ipod

/* generate unique tuple ... */
static int 
gre_unique_tuple(struct ip_conntrack_tuple *tuple,
		 const struct ip_nat_range *range,
		 enum ip_nat_manip_type maniptype,
		 const struct ip_conntrack *conntrack)
{
	u_int32_t min, i, range_size;
	u_int32_t key = 0, *keyptr;

	if (maniptype == IP_NAT_MANIP_SRC)
		keyptr = &tuple->src.u.gre.key;
	else
		keyptr = &tuple->dst.u.gre.key;

	if (!(range->flags & IP_NAT_RANGE_PROTO_SPECIFIED)) {

		switch (tuple->dst.u.gre.version) {
		case 0:
			DEBUGP("NATing GRE version 0 (ct=%p)\n",
				conntrack);
			min = 1;
			range_size = 0xffffffff;
			break;
		case GRE_VERSION_PPTP:
			DEBUGP("%p: NATing GRE PPTP\n", 
				conntrack);
			min = 1;
			range_size = 0xffff;
			break;
		default:
			printk(KERN_WARNING "nat_gre: unknown GRE version\n");
			return 0;
			break;
		}

	} else {
		min = ntohl(range->min.gre.key);
		range_size = ntohl(range->max.gre.key) - min + 1;
	}

	DEBUGP("min = %u, range_size = %u\n", min, range_size); 

	for (i = 0; i < range_size; i++, key++) {
		*keyptr = htonl(min + key % range_size);
		if (!ip_nat_used_tuple(tuple, conntrack))
			return 1;
	}

	DEBUGP("%p: no NAT mapping\n", conntrack);

	return 0;
}

Ejemplo n.º 2

Archivo: ip_nat_proto_udp.c Proyecto: StephenMacras/dsl-n55u-bender

static int
udp_unique_tuple(struct ip_conntrack_tuple *tuple,
		 const struct ip_nat_range *range,
		 enum ip_nat_manip_type maniptype,
		 const struct ip_conntrack *conntrack)
{
	static u_int16_t port;
	__be16 *portptr;
	unsigned int range_size, min, i;

	if (maniptype == IP_NAT_MANIP_SRC)
		portptr = &tuple->src.u.udp.port;
	else
		portptr = &tuple->dst.u.udp.port;

	/* If no range specified... */
	if (!(range->flags & IP_NAT_RANGE_PROTO_SPECIFIED)) {
		/* If it's dst rewrite, can't change port */
		if (maniptype == IP_NAT_MANIP_DST)
			return 0;

		if (ntohs(*portptr) < 1024) {
			/* Loose convention: >> 512 is credential passing */
			if (ntohs(*portptr)<512) {
				min = 1;
				range_size = 511 - min + 1;
			} else {
				min = 600;
				range_size = 1023 - min + 1;
			}
		} else {
			min = 1024;
			range_size = 65535 - 1024 + 1;
		}
	} else {
		min = ntohs(range->min.udp.port);
		range_size = ntohs(range->max.udp.port) - min + 1;
	}

	/* Start from random port to avoid prediction */
	if (range->flags & IP_NAT_RANGE_PROTO_RANDOM)
		port = net_random();

	for (i = 0; i < range_size; i++, port++) {
		*portptr = htons(min + port % range_size);
		if (!ip_nat_used_tuple(tuple, conntrack))
			return 1;
	}
	return 0;
}

Ejemplo n.º 3

Archivo: ip_nat_proto_icmp.c Proyecto: StephenMacras/dsl-n55u-bender

static int
icmp_unique_tuple(struct ip_conntrack_tuple *tuple,
		  const struct ip_nat_range *range,
		  enum ip_nat_manip_type maniptype,
		  const struct ip_conntrack *conntrack)
{
	static u_int16_t id;
	unsigned int range_size;
	unsigned int i;

	range_size = ntohs(range->max.icmp.id) - ntohs(range->min.icmp.id) + 1;
	/* If no range specified... */
	if (!(range->flags & IP_NAT_RANGE_PROTO_SPECIFIED))
		range_size = 0xFFFF;

	for (i = 0; i < range_size; i++, id++) {
		tuple->src.u.icmp.id = htons(ntohs(range->min.icmp.id) +
					     (id % range_size));
		if (!ip_nat_used_tuple(tuple, conntrack))
			return 1;
	}
	return 0;
}

Ejemplo n.º 4

Archivo: ip_nat_proto_gre.c Proyecto: Voskrese/mipsonqemu

/* generate unique tuple ... */
static int
gre_unique_tuple(struct ip_conntrack_tuple *tuple,
		 const struct ip_nat_range *range,
		 enum ip_nat_manip_type maniptype,
		 const struct ip_conntrack *conntrack)
{
	static u_int16_t key;
	__be16 *keyptr;
	unsigned int min, i, range_size;

	if (maniptype == IP_NAT_MANIP_SRC)
		keyptr = &tuple->src.u.gre.key;
	else
		keyptr = &tuple->dst.u.gre.key;

	if (!(range->flags & IP_NAT_RANGE_PROTO_SPECIFIED)) {
		DEBUGP("%p: NATing GRE PPTP\n", conntrack);
		min = 1;
		range_size = 0xffff;
	} else {
		min = ntohs(range->min.gre.key);
		range_size = ntohs(range->max.gre.key) - min + 1;
	}

	DEBUGP("min = %u, range_size = %u\n", min, range_size);

	for (i = 0; i < range_size; i++, key++) {
		*keyptr = htons(min + key % range_size);
		if (!ip_nat_used_tuple(tuple, conntrack))
			return 1;
	}

	DEBUGP("%p: no NAT mapping\n", conntrack);

	return 0;
}