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/*
* snat.h - simple nat definitions
*
* Copyright (c) 2016 Cisco and/or its affiliates.
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at:
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#ifndef __included_snat_h__
#define __included_snat_h__
#include <vnet/vnet.h>
#include <vnet/ip/ip.h>
#include <vnet/ethernet/ethernet.h>
#include <vnet/ip/icmp46_packet.h>
#include <vnet/api_errno.h>
#include <vppinfra/bihash_8_8.h>
#include <vppinfra/dlist.h>
#include <vppinfra/error.h>
#include <vlibapi/api.h>
/* Key */
typedef struct {
union
{
struct
{
ip4_address_t addr;
u16 port;
u16 protocol:3,
fib_index:13;
};
u64 as_u64;
};
} snat_session_key_t;
typedef struct {
union
{
struct
{
ip4_address_t addr;
u32 fib_index;
};
u64 as_u64;
};
} snat_user_key_t;
typedef enum {
SNAT_PROTOCOL_UDP = 0,
SNAT_PROTOCOL_TCP,
SNAT_PROTOCOL_ICMP,
} snat_protocol_t;
typedef CLIB_PACKED(struct {
snat_session_key_t out2in; /* 0-15 */
snat_session_key_t in2out; /* 16-31 */
u32 flags; /* 32-35 */
/* per-user translations */
u32 per_user_index; /* 36-39 */
u32 per_user_list_head_index; /* 40-43 */
/* Last heard timer */
f64 last_heard; /* 44-51 */
u64 total_bytes; /* 52-59 */
u32 total_pkts; /* 60-63 */
/* Outside address */
u32 outside_address_index; /* 64-67 */
}) snat_session_t;
#define SNAT_SESSION_STATIC (1<<0)
typedef struct {
ip4_address_t addr;
u32 sessions_per_user_list_head_index;
u32 nsessions;
} snat_user_t;
typedef struct {
ip4_address_t addr;
u32 busy_ports;
uword * busy_port_bitmap;
} snat_address_t;
typedef struct {
/* Main lookup tables */
clib_bihash_8_8_t out2in;
clib_bihash_8_8_t in2out;
/* Find-a-user => src address lookup */
clib_bihash_8_8_t user_hash;
/* User pool */
snat_user_t * users;
/* Session pool */
snat_session_t * sessions;
/* Vector of outside addresses */
snat_address_t * addresses;
/* Pool of doubly-linked list elements */
dlist_elt_t * list_pool;
/* Randomize port allocation order */
u32 random_seed;
/* ip4 feature path indices */
u32 rx_feature_in2out;
u32 rx_feature_out2in;
/* Config parameters */
u32 translation_buckets;
u32 translation_memory_size;
u32 user_buckets;
u32 user_memory_size;
u32 max_translations_per_user;
u32 outside_vrf_id;
u32 outside_fib_index;
/* API message ID base */
u16 msg_id_base;
/* convenience */
vlib_main_t * vlib_main;
vnet_main_t * vnet_main;
ip4_main_t * ip4_main;
ip_lookup_main_t * ip4_lookup_main;
ethernet_main_t * ethernet_main;
api_main_t * api_main;
} snat_main_t;
extern snat_main_t snat_main;
extern vlib_node_registration_t snat_in2out_node;
extern vlib_node_registration_t snat_out2in_node;
void snat_free_outside_address_and_port (snat_main_t * sm,
snat_session_key_t * k,
u32 address_index);
int snat_alloc_outside_address_and_port (snat_main_t * sm,
snat_session_key_t * k,
u32 * address_indexp);
format_function_t format_snat_user;
typedef struct {
u32 cached_sw_if_index;
u32 cached_ip4_address;
} snat_runtime_t;
/*
* Why is this here? Because we don't need to touch this layer to
* simply reply to an icmp. We need to change id to a unique
* value to NAT an echo request/reply.
*/
typedef struct {
u16 identifier;
u16 sequence;
} icmp_echo_header_t;
#endif /* __included_snat_h__ */
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