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/*
* OpenVPN -- An application to securely tunnel IP networks
* over a single TCP/UDP port, with support for SSL/TLS-based
* session authentication and key exchange,
* packet encryption, packet authentication, and
* packet compression.
*
* Copyright (C) 2002-2010 OpenVPN Technologies, Inc. <sales@openvpn.net>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2
* as published by the Free Software Foundation.
*
* 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 (see the file COPYING included with this
* distribution); if not, write to the Free Software Foundation, Inc.,
* 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#ifndef MROUTE_H
#define MROUTE_H
#if P2MP_SERVER
#include "buffer.h"
#include "list.h"
#include "route.h"
#define IP_MCAST_SUBNET_MASK ((in_addr_t)240<<24)
#define IP_MCAST_NETWORK ((in_addr_t)224<<24)
/* Return status values for mroute_extract_addr_from_packet */
#define MROUTE_EXTRACT_SUCCEEDED (1<<0)
#define MROUTE_EXTRACT_BCAST (1<<1)
#define MROUTE_EXTRACT_MCAST (1<<2)
#define MROUTE_EXTRACT_IGMP (1<<3)
#define MROUTE_SEC_EXTRACT_SUCCEEDED (1<<(0+MROUTE_SEC_SHIFT))
#define MROUTE_SEC_EXTRACT_BCAST (1<<(1+MROUTE_SEC_SHIFT))
#define MROUTE_SEC_EXTRACT_MCAST (1<<(2+MROUTE_SEC_SHIFT))
#define MROUTE_SEC_EXTRACT_IGMP (1<<(3+MROUTE_SEC_SHIFT))
#define MROUTE_SEC_SHIFT 4
/*
* Choose the largest address possible with
* any of our supported types, which is IPv6
* with port number.
*/
#define MR_MAX_ADDR_LEN 20
/*
* Address Types
*/
#define MR_ADDR_NONE 0
#define MR_ADDR_ETHER 1
#define MR_ADDR_IPV4 2
#define MR_ADDR_IPV6 3
#define MR_ADDR_MASK 3
/* Address type mask indicating that port # is part of address */
#define MR_WITH_PORT 4
/* Address type mask indicating that netbits is part of address */
#define MR_WITH_NETBITS 8
/* Indicates than IPv4 addr was extracted from ARP packet */
#define MR_ARP 16
struct mroute_addr {
uint8_t len; /* length of address */
uint8_t unused;
uint8_t type; /* MR_ADDR/MR_WITH flags */
uint8_t netbits; /* number of bits in network part of address,
valid if MR_WITH_NETBITS is set */
uint8_t addr[MR_MAX_ADDR_LEN]; /* actual address */
};
/*
* Number of bits in an address. Should be raised for IPv6.
*/
#define MR_HELPER_NET_LEN 32
/*
* Used to help maintain CIDR routing table.
*/
struct mroute_helper {
unsigned int cache_generation; /* incremented when route added */
int ageable_ttl_secs; /* host route cache entry time-to-live*/
int n_net_len; /* length of net_len array */
uint8_t net_len[MR_HELPER_NET_LEN]; /* CIDR netlengths in descending order */
int net_len_refcount[MR_HELPER_NET_LEN]; /* refcount of each netlength */
};
struct openvpn_sockaddr;
bool mroute_extract_openvpn_sockaddr (struct mroute_addr *addr,
const struct openvpn_sockaddr *osaddr,
bool use_port);
bool mroute_learnable_address (const struct mroute_addr *addr);
uint32_t mroute_addr_hash_function (const void *key, uint32_t iv);
bool mroute_addr_compare_function (const void *key1, const void *key2);
void mroute_addr_init (struct mroute_addr *addr);
const char *mroute_addr_print (const struct mroute_addr *ma,
struct gc_arena *gc);
#define MAPF_SUBNET (1<<0)
#define MAPF_IA_EMPTY_IF_UNDEF (1<<1)
#define MAPF_SHOW_ARP (1<<2)
const char *mroute_addr_print_ex (const struct mroute_addr *ma,
const unsigned int flags,
struct gc_arena *gc);
void mroute_addr_mask_host_bits (struct mroute_addr *ma);
struct mroute_helper *mroute_helper_init (int ageable_ttl_secs);
void mroute_helper_free (struct mroute_helper *mh);
void mroute_helper_add_iroute (struct mroute_helper *mh, const struct iroute *ir);
void mroute_helper_del_iroute (struct mroute_helper *mh, const struct iroute *ir);
/*
* Given a raw packet in buf, return the src and dest
* addresses of the packet.
*/
static inline unsigned int
mroute_extract_addr_from_packet (struct mroute_addr *src,
struct mroute_addr *dest,
struct mroute_addr *esrc,
struct mroute_addr *edest,
const struct buffer *buf,
int tunnel_type)
{
unsigned int mroute_extract_addr_ipv4 (struct mroute_addr *src,
struct mroute_addr *dest,
const struct buffer *buf);
unsigned int mroute_extract_addr_ether (struct mroute_addr *src,
struct mroute_addr *dest,
struct mroute_addr *esrc,
struct mroute_addr *edest,
const struct buffer *buf);
unsigned int ret = 0;
verify_align_4 (buf);
if (tunnel_type == DEV_TYPE_TUN)
ret = mroute_extract_addr_ipv4 (src, dest, buf);
else if (tunnel_type == DEV_TYPE_TAP)
ret = mroute_extract_addr_ether (src, dest, esrc, edest, buf);
return ret;
}
static inline bool
mroute_addr_equal (const struct mroute_addr *a1, const struct mroute_addr *a2)
{
if (a1->type != a2->type)
return false;
if (a1->netbits != a2->netbits)
return false;
if (a1->len != a2->len)
return false;
return memcmp (a1->addr, a2->addr, a1->len) == 0;
}
static inline const uint8_t *
mroute_addr_hash_ptr (const struct mroute_addr *a)
{
/* NOTE: depends on ordering of struct mroute_addr */
return (uint8_t *) &a->type;
}
static inline uint32_t
mroute_addr_hash_len (const struct mroute_addr *a)
{
return (uint32_t) a->len + 2;
}
static inline void
mroute_extract_in_addr_t (struct mroute_addr *dest, const in_addr_t src)
{
dest->type = MR_ADDR_IPV4;
dest->netbits = 0;
dest->len = 4;
*(in_addr_t*)dest->addr = htonl (src);
}
static inline in_addr_t
in_addr_t_from_mroute_addr (const struct mroute_addr *addr)
{
if ((addr->type & MR_ADDR_MASK) == MR_ADDR_IPV4 && addr->netbits == 0 && addr->len == 4)
return ntohl(*(in_addr_t*)addr->addr);
else
return 0;
}
static inline void
mroute_addr_reset (struct mroute_addr *ma)
{
ma->len = 0;
ma->type = MR_ADDR_NONE;
}
#endif /* P2MP_SERVER */
#endif /* MROUTE_H */
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