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/* vim: set expandtab ts=4 sw=4: */
/*
* You may redistribute this program and/or modify it under the terms of
* the GNU General Public License as published by the Free Software Foundation,
* either version 3 of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#ifndef IpTunnel_H
#define IpTunnel_H
#include "crypto/random/Random.h"
#include "memory/Allocator.h"
#include "interface/Iface.h"
#include "util/log/Log.h"
#include "util/events/EventBase.h"
#include "util/platform/Sockaddr.h"
#include "wire/RouteHeader.h"
#include "tunnel/RouteGen.h"
#include "util/Linker.h"
Linker_require("tunnel/IpTunnel.c");
struct IpTunnel_Connection
{
/** The header for routing to this node. */
struct RouteHeader routeHeader;
/** The IPv6 address used for this connection or all zeros if none was assigned. */
uint8_t connectionIp6[16];
/** The IPv4 address used for this connection or all zeros if none was assigned. */
uint8_t connectionIp4[4];
/** The IPv6 netmask/prefix length, in bits. Defaults to 128 if none was assigned. */
uint8_t connectionIp6Prefix;
/** The IPv6 prefix length in, in bits, defining netmask. 0xff if not used. */
uint8_t connectionIp6Alloc;
/** The IPv4 address prefix length, in bits. Defaults to 32 if none was assigned. */
uint8_t connectionIp4Prefix;
/** The IPv6 prefix length in, in bits, defining netmask. 0xff if not used. */
uint8_t connectionIp4Alloc;
/** non-zero if the connection was made using IpTunnel_connectTo(). */
int isOutgoing : 1;
/** The number of the connection so it can be identified when removing. */
int number : 31;
};
struct IpTunnel
{
/** The interface used to send and receive messages to the TUN device. */
struct Iface tunInterface;
/**
* The interface used to send and receive messages to other nodes.
* All messages sent on this interface shall be preceeded with the RouterHeader and DataHeader.
*/
struct Iface nodeInterface;
/**
* The list of registered connections, do not modify manually.
* Will be reorganized from time to time so pointers are ephemeral.
*/
struct {
uint32_t count;
struct IpTunnel_Connection* connections;
} connectionList;
};
/**
* Create a new IpTunnel structure.
*
* @param logger a logger or NULL.
* @param eventBase the event base.
* @param alloc an allocator.
* @param rand a random generator.
*/
struct IpTunnel* IpTunnel_new(struct Log* logger,
struct EventBase* eventBase,
struct Allocator* alloc,
struct Random* rand,
struct RouteGen* rg);
/**
* Allow another node to tunnel IPv4 and/or ICANN IPv6 through this node.
*
* @param publicKeyOfAuthorizedNode the key for the node which will be allowed to connect.
* @param ip6Addr the IPv6 address which the node will be issued or NULL.
* @param ip6Prefix the IPv6 netmask/prefix length.
* @param ip6Alloc the address block to allocate to the client (v6) 0 is illegal
* @param ip4Addr the IPv4 address which the node will be issued or NULL.
* @param ip4Prefix the IPv4 netmask/prefix length.
* @param ip4Alloc the address block size to allocate to the client (v4) 0 is illegal
* @param tunnel the IpTunnel.
* @return an connection number which is usable with IpTunnel_remove().
*/
int IpTunnel_allowConnection(uint8_t publicKeyOfAuthorizedNode[32],
struct Sockaddr* ip6Addr,
uint8_t ip6Prefix, uint8_t ip6Alloc,
struct Sockaddr* ip4Addr,
uint8_t ip4Prefix, uint8_t ip4Alloc,
struct IpTunnel* tunnel);
/**
* Connect to another node and get IPv4 and/or IPv6 addresses from it.
*
* @param publicKeyOfNodeToConnectTo the key for the node to connect to.
* @param tunnel the IpTunnel.
* @return an connection number which is usable with IpTunnel_remove().
*/
int IpTunnel_connectTo(uint8_t publicKeyOfNodeToConnectTo[32], struct IpTunnel* tunnel);
/**
* Disconnect from a node or remove authorization to connect.
*
* @param connectionNumber the number of the connection to remove.
* @param tunnel the IpTunnel.
* @return 0 if the connection was successfully removed
* IpTunnel_remove_NOT_FOUND if the connection was not found.
*/
#define IpTunnel_removeConnection_NOT_FOUND -1
int IpTunnel_removeConnection(int connectionNumber, struct IpTunnel* tunnel);
void IpTunnel_setTunName(char* interfaceName, struct IpTunnel* ipTun);
#endif