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/*
* Copyright (c) 2020 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.
*/
/**
* @file
* @brief NAT port/address allocation lib
*/
#ifndef included_nat_lib_h__
#define included_nat_lib_h__
#include <vlibapi/api.h>
typedef struct
{
u16 identifier;
u16 sequence;
} nat_icmp_echo_header_t;
typedef struct
{
u16 src_port, dst_port;
} nat_tcp_udp_header_t;
/* NAT API Configuration flags */
#define foreach_nat_config_flag \
_(0x01, IS_TWICE_NAT) \
_(0x02, IS_SELF_TWICE_NAT) \
_(0x04, IS_OUT2IN_ONLY) \
_(0x08, IS_ADDR_ONLY) \
_(0x10, IS_OUTSIDE) \
_(0x20, IS_INSIDE) \
_(0x40, IS_STATIC) \
_(0x80, IS_EXT_HOST_VALID)
typedef enum nat_config_flags_t_
{
#define _(n,f) NAT_API_##f = n,
foreach_nat_config_flag
#undef _
} nat_config_flags_t;
#define foreach_nat_counter _ (tcp) _ (udp) _ (icmp) _ (other) _ (drops)
#define foreach_nat_error \
_ (VALUE_EXIST, -1, "Value already exists") \
_ (NO_SUCH_ENTRY, -2, "No such entry") \
_ (UNKNOWN_PROTOCOL, -3, "Unknown protocol") \
_ (OUT_OF_TRANSLATIONS, -4, "Out of translations")
typedef enum
{
#define _(N, i, s) NAT_ERROR_##N = i,
foreach_nat_error
#undef _
} nat_error_t;
/* default protocol timeouts */
#define NAT_UDP_TIMEOUT 300
#define NAT_TCP_TRANSITORY_TIMEOUT 240
#define NAT_TCP_ESTABLISHED_TIMEOUT 7440
#define NAT_ICMP_TIMEOUT 60
typedef struct
{
struct
{
u32 established;
u32 transitory;
} tcp;
u32 udp;
u32 icmp;
} nat_timeouts_t;
static_always_inline void
nat_reset_timeouts (nat_timeouts_t * timeouts)
{
timeouts->udp = NAT_UDP_TIMEOUT;
timeouts->tcp.established = NAT_TCP_ESTABLISHED_TIMEOUT;
timeouts->tcp.transitory = NAT_TCP_TRANSITORY_TIMEOUT;
timeouts->icmp = NAT_ICMP_TIMEOUT;
}
static_always_inline u32
nat_calc_bihash_buckets (u32 n_elts)
{
n_elts = n_elts / 2.5;
u64 lower_pow2 = 1;
while (lower_pow2 * 2 < n_elts)
{
lower_pow2 = 2 * lower_pow2;
}
u64 upper_pow2 = 2 * lower_pow2;
if ((upper_pow2 - n_elts) < (n_elts - lower_pow2))
{
if (upper_pow2 <= UINT32_MAX)
{
return upper_pow2;
}
}
return lower_pow2;
}
#endif /* included_nat_lib_h__ */
/*
* fd.io coding-style-patch-verification: ON
*
* Local Variables:
* eval: (c-set-style "gnu")
* End:
*/
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