/*
* 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.
*/
#ifndef __included_nat44_ed_h__
#define __included_nat44_ed_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 <vnet/fib/fib_source.h>
#include <vppinfra/elog.h>
#include <vppinfra/bihash_8_8.h>
#include <vppinfra/bihash_16_8.h>
#include <vppinfra/hash.h>
#include <vppinfra/dlist.h>
#include <vppinfra/error.h>
#include <vlibapi/api.h>
#include <nat/lib/lib.h>
#include <nat/lib/inlines.h>
/* default number of worker handoff frame queue elements */
#define NAT_FQ_NELTS_DEFAULT 64
/* number of attempts to get a port for ED overloading algorithm, if rolling
* a dice this many times doesn't produce a free port, it's treated
* as if there were no free ports available to conserve resources */
#define ED_PORT_ALLOC_ATTEMPTS (10)
/* NAT buffer flags */
#define SNAT_FLAG_HAIRPINNING (1 << 0)
/* NAT44 API Configuration flags */
#define foreach_nat44_config_flag \
_ (0x00, IS_ENDPOINT_INDEPENDENT) \
_ (0x01, IS_ENDPOINT_DEPENDENT) \
_ (0x02, IS_STATIC_MAPPING_ONLY) \
_ (0x04, IS_CONNECTION_TRACKING)
typedef enum nat44_config_flags_t_
{
#define _(n,f) NAT44_API_##f = n,
foreach_nat44_config_flag
#undef _
} nat44_config_flags_t;
typedef struct
{
u32 inside_vrf;
u32 outside_vrf;
u32 sessions;
} nat44_config_t;
typedef enum
{
NAT_NEXT_DROP,
NAT_NEXT_ICMP_ERROR,
NAT_NEXT_IN2OUT_ED_FAST_PATH,
NAT_NEXT_IN2OUT_ED_SLOW_PATH,
NAT_NEXT_IN2OUT_ED_OUTPUT_FAST_PATH,
NAT_NEXT_IN2OUT_ED_OUTPUT_SLOW_PATH,
NAT_NEXT_OUT2IN_ED_FAST_PATH,
NAT_NEXT_OUT2IN_ED_SLOW_PATH,
NAT_NEXT_IN2OUT_CLASSIFY,
NAT_NEXT_OUT2IN_CLASSIFY,
NAT_N_NEXT,
} nat_next_t;
typedef struct
{
u32 next_index;
u32 arc_next_index;
} nat_pre_trace_t;
#define foreach_nat_in2out_ed_error \
_ (UNSUPPORTED_PROTOCOL, "unsupported protocol") \
_ (OUT_OF_PORTS, "out of ports") \
_ (BAD_ICMP_TYPE, "unsupported ICMP type") \
_ (MAX_SESSIONS_EXCEEDED, "maximum sessions exceeded") \
_ (NON_SYN, "non-SYN packet try to create session") \
_ (TRNSL_FAILED, "couldn't translate packet")
typedef enum
{
#define _(sym,str) NAT_IN2OUT_ED_ERROR_##sym,
foreach_nat_in2out_ed_error
#undef _
NAT_IN2OUT_ED_N_ERROR,
} nat_in2out_ed_error_t;
#define foreach_nat_out2in_ed_error \
_ (UNSUPPORTED_PROTOCOL, "unsupported protocol") \
_ (OUT_OF_PORTS, "out of ports") \
_ (BAD_ICMP_TYPE, "unsupported ICMP type") \
_ (NO_TRANSLATION, "no translation") \
_ (MAX_SESSIONS_EXCEEDED, "maximum sessions exceeded") \
_ (NON_SYN, "non-SYN packet try to create session") \
_ (TCP_CLOSED, "drops due to TCP in transitory timeout") \
_ (HASH_ADD_FAILED, "hash table add failed") \
_ (TRNSL_FAILED, "couldn't translate packet")
typedef enum
{
#define _(sym,str) NAT_OUT2IN_ED_ERROR_##sym,
foreach_nat_out2in_ed_error
#undef _
NAT_OUT2IN_ED_N_ERROR,
} nat_out2in_ed_error_t;
typedef enum
{
NAT44_ED_TCP_FLAG_NONE = 0,
NAT44_ED_TCP_FLAG_FIN,
NAT44_ED_TCP_FLAG_SYN,
NAT44_ED_TCP_FLAG_SYNFIN,
NAT44_ED_TCP_FLAG_RST,
NAT44_ED_TCP_FLAG_FINRST,
NAT44_ED_TCP_FLAG_SYNRST,
NAT44_ED_TCP_FLAG_SYNFINRST,
NAT44_ED_TCP_N_FLAG,
} nat44_ed_tcp_flag_e;
typedef enum
{
NAT44_ED_DIR_I2O = 0,
NAT44_ED_DIR_O2I,
NAT44_ED_N_DIR,
} nat44_ed_dir_e;
/* Endpoint dependent TCP session state */
typedef enum
{
NAT44_ED_TCP_STATE_CLOSED = 0,
NAT44_ED_TCP_STATE_SYN_I2O,
NAT44_ED_TCP_STATE_SYN_O2I,
NAT44_ED_TCP_STATE_ESTABLISHED,
NAT44_ED_TCP_STATE_FIN_I2O,
NAT44_ED_TCP_STATE_FIN_O2I,
NAT44_ED_TCP_STATE_RST_TRANS,
NAT44_ED_TCP_STATE_FIN_TRANS,
NAT44_ED_TCP_STATE_FIN_REOPEN_SYN_I2O,
NAT44_ED_TCP_STATE_FIN_REOPEN_SYN_O2I,
NAT44_ED_TCP_N_STATE,
} nat44_ed_tcp_state_e;
format_function_t format_ed_session_kvp;
format_function_t format_snat_session;
format_function_t format_snat_static_mapping;
format_function_t format_snat_static_map_to_resolve;
format_function_t format_nat_ed_translation_error;
format_function_t format_nat_6t_flow;
format_function_t format_nat_6t;
format_function_t format_nat44_ed_tcp_state;
/* Session flags */
#define SNAT_SESSION_FLAG_STATIC_MAPPING (1 << 0)
#define SNAT_SESSION_FLAG_LOAD_BALANCING (1 << 2)
#define SNAT_SESSION_FLAG_TWICE_NAT (1 << 3)
#define SNAT_SESSION_FLAG_ENDPOINT_DEPENDENT (1 << 4)
#define SNAT_SESSION_FLAG_FWD_BYPASS (1 << 5)
#define SNAT_SESSION_FLAG_AFFINITY (1 << 6)
#define SNAT_SESSION_FLAG_EXACT_ADDRESS (1 << 7)
#define SNAT_SESSION_FLAG_HAIRPINNING (1 << 8)
/* NAT interface flags */
#define NAT_INTERFACE_FLAG_IS_INSIDE 1
#define NAT_INTERFACE_FLAG_IS_OUTSIDE 2
/* Static mapping flags */
#define NAT_SM_FLAG_SELF_TWICE_NAT (1 << 1)
#define NAT_SM_FLAG_TWICE_NAT (1 << 2)
#define NAT_SM_FLAG_IDENTITY_NAT (1 << 3)
#define NAT_SM_FLAG_ADDR_ONLY (1 << 4)
#define NAT_SM_FLAG_EXACT_ADDRESS (1 << 5)
#define NAT_SM_FLAG_OUT2IN_ONLY (1 << 6)
#define NAT_SM_FLAG_LB (1 << 7)
#define NAT_SM_FLAG_SWITCH_ADDRESS (1 << 8)
typedef CLIB_PACKED(struct
{
// number of sessions in this vrf
u32 ses_count;
u32 rx_fib_index;
u32 tx_fib_index;
// is this vrf expired
u8 expired;
}) per_vrf_sessions_t;
typedef union
{
struct
{
ip4_address_t saddr, daddr;
u16 sport; // ICMP id for ICMP case
u16 dport;
u32 fib_index : 24;
u8 proto;
};
u64 as_u64[2];
u64x2u as_u128;
} nat_6t_t;
STATIC_ASSERT_SIZEOF (nat_6t_t, 2 * sizeof (u64));
typedef struct
{
#define NAT_FLOW_OP_SADDR_REWRITE (1 << 1)
#define NAT_FLOW_OP_SPORT_REWRITE (1 << 2)
#define NAT_FLOW_OP_DADDR_REWRITE (1 << 3)
#define NAT_FLOW_OP_DPORT_REWRITE (1 << 4)
#define NAT_FLOW_OP_ICMP_ID_REWRITE (1 << 5)
#define NAT_FLOW_OP_TXFIB_REWRITE (1 << 6)
int ops;
nat_6t_t match;
struct
{
ip4_address_t saddr, daddr;
u16 sport;
u16 dport;
u32 fib_index;
u8 proto;
u16 icmp_id;
} rewrite;
uword l3_csum_delta;
uword l4_csum_delta;
} nat_6t_flow_t;
void nat44_ed_forwarding_enable_disable (u8 is_enable);
always_inline void
nat_6t_flow_saddr_rewrite_set (nat_6t_flow_t *f, u32 saddr)
{
f->ops |= NAT_FLOW_OP_SADDR_REWRITE;
f->rewrite.saddr.as_u32 = saddr;
}
always_inline void
nat_6t_flow_daddr_rewrite_set (nat_6t_flow_t *f, u32 daddr)
{
f->ops |= NAT_FLOW_OP_DADDR_REWRITE;
f->rewrite.daddr.as_u32 = daddr;
}
always_inline void
nat_6t_flow_sport_rewrite_set (nat_6t_flow_t *f, u32 sport)
{
f->ops |= NAT_FLOW_OP_SPORT_REWRITE;
f->rewrite.sport = sport;
}
always_inline void
nat_6t_flow_dport_rewrite_set (nat_6t_flow_t *f, u32 dport)
{
f->ops |= NAT_FLOW_OP_DPORT_REWRITE;
f->rewrite.dport = dport;
}
always_inline void
nat_6t_flow_txfib_rewrite_set (nat_6t_flow_t *f, u32 tx_fib_index)
{
f->ops |= NAT_FLOW_OP_TXFIB_REWRITE;
f->rewrite.fib_index = tx_fib_index;
}
always_inline void
nat_6t_flow_icmp_id_rewrite_set (nat_6t_flow_t *f, u16 id)
{
f->ops |= NAT_FLOW_OP_ICMP_ID_REWRITE;
f->rewrite.icmp_id = id;
}
typedef CLIB_PACKED(struct
{
/* Outside network tuple */
struct
{
ip4_address_t addr;
u32 fib_index;
u16 port;
} out2in;
/* Inside network tuple */
struct
{
ip4_address_t addr;
u32 fib_index;
u16 port;
} in2out;
ip_protocol_t proto;
nat_6t_flow_t i2o;
nat_6t_flow_t o2i;
/* Flags */
u32 flags;
/* head of LRU list in which this session is tracked */
u32 lru_head_index;
/* index in global LRU list */
u32 lru_index;
f64 last_lru_update;
/* Last heard timer */
f64 last_heard;
/* Last HA refresh */
f64 ha_last_refreshed;
/* Counters */
u64 total_bytes;
u32 total_pkts;
/* External host address and port */
ip4_address_t ext_host_addr;
u16 ext_host_port;
/* External host address and port after translation */
ip4_address_t ext_host_nat_addr;
u16 ext_host_nat_port;
/* TCP session state */
nat44_ed_tcp_state_e tcp_state;
/* per vrf sessions index */
u32 per_vrf_sessions_index;
u32 thread_index;
}) snat_session_t;
typedef struct
{
ip4_address_t addr;
ip4_address_t net;
u32 sw_if_index;
u32 fib_index;
u32 addr_len;
} snat_address_t;
typedef struct
{
/* backend IP address */
ip4_address_t addr;
/* backend port number */
u16 port;
/* probability of the backend to be randomly matched */
u8 probability;
u8 prefix;
/* backend FIB table */
u32 vrf_id;
u32 fib_index;
} nat44_lb_addr_port_t;
typedef enum
{
/* twice-nat disabled */
TWICE_NAT_DISABLED,
/* twice-nat enabled */
TWICE_NAT,
/* twice-nat only when src IP equals dst IP after translation */
TWICE_NAT_SELF,
} twice_nat_type_t;
typedef enum
{
/* no load-balancing */
NO_LB_NAT,
/* load-balancing */
LB_NAT,
/* load-balancing with affinity */
AFFINITY_LB_NAT,
} lb_nat_type_t;
typedef struct
{
/* preferred pool address */
ip4_address_t pool_addr;
/* local IP address */
ip4_address_t local_addr;
/* external IP address */
ip4_address_t external_addr;
/* local port */
u16 local_port;
/* external port */
u16 external_port;
/* local FIB table */
u32 vrf_id;
u32 fib_index;
/* protocol */
ip_protocol_t proto;
/* 0 = disabled, otherwise client IP affinity sticky time in seconds */
u32 affinity;
/* worker threads used by backends/local host */
u32 *workers;
/* opaque string tag */
u8 *tag;
/* backends for load-balancing mode */
nat44_lb_addr_port_t *locals;
/* affinity per service lis */
u32 affinity_per_service_list_head_index;
/* flags */
u32 flags;
} snat_static_mapping_t;
typedef struct
{
u32 sw_if_index;
u8 flags;
} snat_interface_t;
typedef struct
{
u8 is_resolved;
ip4_address_t l_addr;
ip4_address_t pool_addr;
u16 l_port;
u16 e_port;
u32 sw_if_index;
u32 vrf_id;
ip_protocol_t proto;
u32 flags;
u8 *tag;
} snat_static_mapping_resolve_t;
typedef struct
{
u8 is_resolved;
u8 is_twice_nat;
u32 sw_if_index;
} snat_address_resolve_t;
typedef struct
{
u32 count;
u32 sw_if_index;
ip4_address_t addr;
} snat_fib_entry_reg_t;
typedef struct
{
/* Session pool */
snat_session_t *sessions;
/* Pool of doubly-linked list elements */
dlist_elt_t *list_pool;
/* LRU session list - head is stale, tail is fresh */
dlist_elt_t *lru_pool;
u32 tcp_trans_lru_head_index;
u32 tcp_estab_lru_head_index;
u32 udp_lru_head_index;
u32 icmp_lru_head_index;
u32 unk_proto_lru_head_index;
/* NAT thread index */
u32 snat_thread_index;
/* real thread index */
u32 thread_index;
per_vrf_sessions_t *per_vrf_sessions_vec;
} snat_main_per_thread_data_t;
struct snat_main_s;
u32 nat44_ed_get_in2out_worker_index (vlib_buffer_t *b, ip4_header_t *ip,
u32 rx_fib_index, u8 is_output);
u32 nat44_ed_get_out2in_worker_index (vlib_buffer_t *b, ip4_header_t *ip,
u32 rx_fib_index, u8 is_output);
/* Return worker thread index for given packet */
/* NAT address and port allocation function */
typedef int (nat_alloc_out_addr_and_port_function_t) (
snat_address_t *addresses, u32 fib_index, u32 thread_index,
ip_protocol_t proto, ip4_address_t *addr, u16 *port, u16 port_per_thread,
u32 snat_thread_index);
typedef struct nat_fib_s
{
u32 fib_index;
u32 ref_count;
} nat_fib_t;
typedef struct vrf_route_s
{
u32 vrf_id;
u32 fib_index;
} vrf_route_t;
typedef struct vrf_table_s
{
u32 table_vrf_id;
u32 table_fib_index;
vrf_route_t *routes;
} vrf_table_t;
typedef struct snat_main_s
{
/* Thread settings */
u32 num_workers;
u32 first_worker_index;
u32 *workers;
u16 port_per_thread;
/* Per thread data */
snat_main_per_thread_data_t *per_thread_data;
/* Static mapping pool */
snat_static_mapping_t *static_mappings;
/* Endpoint independent lookup tables */
clib_bihash_8_8_t in2out;
clib_bihash_8_8_t out2in;
/* Endpoint dependent lookup table */
clib_bihash_16_8_t flow_hash;
// vector of fibs
nat_fib_t *fibs;
u32 inside_vrf_id;
u32 inside_fib_index;
u32 outside_vrf_id;
u32 outside_fib_index;
// vector of outside fibs
nat_fib_t *outside_fibs;
// VRF routing table for dynamic sessions
vrf_table_t *vrf_tables;
/* Interface pool */
snat_interface_t *interfaces;
snat_interface_t *output_feature_interfaces;
// broken api backward compatibility
snat_interface_t *output_feature_dummy_interfaces;
/* Vector of outside addresses */
snat_address_t *addresses;
/* Vector of twice NAT addresses for external hosts */
snat_address_t *twice_nat_addresses;
/* first interface address should be auto-added */
snat_address_resolve_t *addr_to_resolve;
/* vector of fib entries */
snat_fib_entry_reg_t *fib_entry_reg;
/* vector of interface address static mappings to resolve. */
snat_static_mapping_resolve_t *sm_to_resolve;
/* Randomize port allocation order */
u32 random_seed;
/* Worker handoff frame-queue index */
u32 fq_in2out_index;
u32 fq_in2out_output_index;
u32 fq_out2in_index;
nat44_config_t rconfig;
/* If forwarding is enabled */
u8 forwarding_enabled;
/* Is translation memory size calculated or user defined */
u8 translation_memory_size_set;
u32 translation_buckets;
u32 max_translations_per_thread;
u32 *max_translations_per_fib;
nat_timeouts_t timeouts;
/* TCP MSS clamping */
u16 mss_clamping;
/* counters */
vlib_simple_counter_main_t total_sessions;
u32 max_cfg_sessions_gauge; /* Index of max configured sessions gauge in
stats */
#define _(x) vlib_simple_counter_main_t x;
struct
{
struct
{
struct
{
foreach_nat_counter;
} in2out;
struct
{
foreach_nat_counter;
} out2in;
} fastpath;
struct
{
struct
{
foreach_nat_counter;
} in2out;
struct
{
foreach_nat_counter;
} out2in;
} slowpath;
vlib_simple_counter_main_t hairpinning;
} counters;
#undef _
/* API message ID base */
u16 msg_id_base;
/* log class */
vlib_log_class_t log_class;
/* logging level */
u8 log_level;
/* convenience */
ip4_main_t *ip4_main;
fib_source_t fib_src_hi;
fib_source_t fib_src_low;
/* number of worker handoff frame queue elements */
u32 frame_queue_nelts;
/* nat44 plugin enabled */
u8 enabled;
vnet_main_t *vnet_main;
/* TCP session state machine table:
* first dimension is possible states
* second dimension is direction (in2out/out2in)
* third dimension is TCP flag (SYN, RST, FIN)
*
* value is next state to change to
*/
nat44_ed_tcp_state_e tcp_state_change_table[NAT44_ED_TCP_N_STATE]
[NAT44_ED_N_DIR]
[NAT44_ED_TCP_N_FLAG];
} snat_main_t;
typedef struct
{
u32 thread_index;
f64 now;
} nat44_is_idle_session_ctx_t;
typedef struct
{
u32 cached_sw_if_index;
uword *cached_presence_by_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.
*/
extern snat_main_t snat_main;
extern vlib_node_registration_t nat_default_node;
extern vlib_node_registration_t nat_pre_in2out_node;
extern vlib_node_registration_t nat_pre_out2in_node;
extern vlib_node_registration_t nat44_ed_in2out_node;
extern vlib_node_registration_t nat44_ed_in2out_output_node;
extern vlib_node_registration_t nat44_ed_out2in_node;
extern vlib_node_registration_t snat_in2out_worker_handoff_node;
extern vlib_node_registration_t snat_in2out_output_worker_handoff_node;
extern vlib_node_registration_t snat_out2in_worker_handoff_node;
/** \brief Check if SNAT session is created from static mapping.
@param s SNAT session
@return true if SNAT session is created from static mapping otherwise 0
*/
always_inline bool
nat44_ed_is_session_static (snat_session_t *s)
{
return s->flags & SNAT_SESSION_FLAG_STATIC_MAPPING;
}
/** \brief Check if NAT session is twice NAT.
@param s NAT session
@return true if NAT session is twice NAT
*/
always_inline bool
nat44_ed_is_twice_nat_session (snat_session_t *s)
{
return s->flags & SNAT_SESSION_FLAG_TWICE_NAT;
}
/** \brief Check if NAT session is load-balancing.
@param s NAT session
@return true if NAT session is load-balancing
*/
always_inline bool
nat44_ed_is_lb_session (snat_session_t *s)
{
return s->flags & SNAT_SESSION_FLAG_LOAD_BALANCING;
}
/** \brief Check if NAT session is forwarding bypass.
@param s NAT session
@return true if NAT session is load-balancing
*/
always_inline bool
na44_ed_is_fwd_bypass_session (snat_session_t *s)
{
return s->flags & SNAT_SESSION_FLAG_FWD_BYPASS;
}
/** \brief Check if NAT session has affinity record.
@param s NAT session
@return true if NAT session has affinity record
*/
always_inline bool
nat44_ed_is_affinity_session (snat_session_t *s)
{
return s->flags & SNAT_SESSION_FLAG_AFFINITY;
}
/** \brief Check if exact pool address should be used.
@param s SNAT session
@return true if exact pool address
*/
always_inline bool
nat44_ed_is_exact_address_session (snat_session_t *s)
{
return s->flags & SNAT_SESSION_FLAG_EXACT_ADDRESS;
}
/** \brief Check if NAT interface is inside.
@param i NAT interface
@return true if inside interface
*/
always_inline bool
nat44_ed_is_interface_inside (snat_interface_t *i)
{
return i->flags & NAT_INTERFACE_FLAG_IS_INSIDE;
}
/** \brief Check if NAT interface is outside.
@param i NAT interface
@return true if outside interface
*/
always_inline bool
nat44_ed_is_interface_outside (snat_interface_t *i)
{
return i->flags & NAT_INTERFACE_FLAG_IS_OUTSIDE;
}
/** \brief Check if client initiating TCP connection (received SYN from client)
@param t TCP header
@return true if client initiating TCP connection
*/
always_inline bool
tcp_flags_is_init (u8 f)
{
return (f & TCP_FLAG_SYN) && !(f & TCP_FLAG_ACK);
}
always_inline bool
is_sm_addr_only (u32 f)
{
return (f & NAT_SM_FLAG_ADDR_ONLY);
}
always_inline bool
is_sm_out2in_only (u32 f)
{
return (f & NAT_SM_FLAG_OUT2IN_ONLY);
}
always_inline bool
is_sm_identity_nat (u32 f)
{
return (f & NAT_SM_FLAG_IDENTITY_NAT);
}
always_inline bool
is_sm_lb (u32 f)
{
return (f & NAT_SM_FLAG_LB);
}
always_inline bool
is_sm_exact_address (u32 f)
{
return (f & NAT_SM_FLAG_EXACT_ADDRESS);
}
always_inline bool
is_sm_self_twice_nat (u32 f)
{
return (f & NAT_SM_FLAG_SELF_TWICE_NAT);
}
always_inline bool
is_sm_twice_nat (u32 f)
{
return (f & NAT_SM_FLAG_TWICE_NAT);
}
always_inline bool
is_sm_switch_address (u32 f)
{
return (f & NAT_SM_FLAG_SWITCH_ADDRESS);
}
#define nat_log_err(...) \
vlib_log(VLIB_LOG_LEVEL_ERR, snat_main.log_class, __VA_ARGS__)
#define nat_log_warn(...) \
vlib_log(VLIB_LOG_LEVEL_WARNING, snat_main.log_class, __VA_ARGS__)
#define nat_log_info(...) \
vlib_log(VLIB_LOG_LEVEL_INFO, snat_main.log_class, __VA_ARGS__)
#define nat_log_debug(...)\
vlib_log(VLIB_LOG_LEVEL_DEBUG, snat_main.log_class, __VA_ARGS__)
clib_error_t *nat44_api_hookup (vlib_main_t *vm);
int snat_set_workers (uword *bitmap);
int nat44_plugin_enable (nat44_config_t c);
int nat44_plugin_disable ();
int nat44_ed_add_interface (u32 sw_if_index, u8 is_inside);
int nat44_ed_del_interface (u32 sw_if_index, u8 is_inside);
int nat44_ed_add_output_interface (u32 sw_if_index);
int nat44_ed_del_output_interface (u32 sw_if_index);
int nat44_ed_add_address (ip4_address_t *addr, u32 vrf_id, u8 twice_nat);
int nat44_ed_del_address (ip4_address_t addr, u8 twice_nat);
int nat44_ed_add_interface_address (u32 sw_if_index, u8 twice_nat);
int nat44_ed_del_interface_address (u32 sw_if_index, u8 twice_nat);
int nat44_ed_add_del_vrf_table (u32 table_vrf_id, bool is_add);
int nat44_ed_add_del_vrf_route (u32 table_vrf_id, u32 vrf_id, bool is_add);
void nat44_ed_del_vrf_tables ();
int nat44_ed_add_static_mapping (ip4_address_t l_addr, ip4_address_t e_addr,
u16 l_port, u16 e_port, ip_protocol_t proto,
u32 vrf_id, u32 sw_if_index, u32 flags,
ip4_address_t pool_addr, u8 *tag);
int nat44_ed_del_static_mapping (ip4_address_t l_addr, ip4_address_t e_addr,
u16 l_port, u16 e_port, ip_protocol_t proto,
u32 vrf_id, u32 sw_if_index, u32 flags);
int nat44_ed_add_lb_static_mapping (ip4_address_t e_addr, u16 e_port,
ip_protocol_t proto,
nat44_lb_addr_port_t *locals, u32 flags,
u8 *tag, u32 affinity);
int nat44_ed_del_lb_static_mapping (ip4_address_t e_addr, u16 e_port,
ip_protocol_t proto, u32 flags);
int nat44_ed_add_del_lb_static_mapping_local (ip4_address_t e_addr, u16 e_port,
ip4_address_t l_addr, u16 l_port,
ip_protocol_t proto, u32 vrf_id,
u8 probability, u8 is_add);
/**
* @brief Delete NAT44 endpoint-dependent session
*
* @param sm snat global configuration data
* @param addr IPv4 address
* @param port L4 port number
* @param proto L4 protocol
* @param vrf_id VRF ID
* @param is_in 1 = inside network address and port pair, 0 = outside
*
* @return 0 on success, non-zero value otherwise
*/
int nat44_ed_del_session (snat_main_t *sm, ip4_address_t *addr, u16 port,
ip4_address_t *eh_addr, u16 eh_port, u8 proto,
u32 vrf_id, int is_in);
void nat44_ed_free_session_data (snat_main_t *sm, snat_session_t *s,
u32 thread_index, u8 is_ha);
/**
* @brief Set NAT44 session limit (session limit, vrf id)
*
* @param session_limit Session limit
* @param vrf_id VRF id
* @return 0 on success, non-zero value otherwise
*/
int nat44_set_session_limit (u32 session_limit, u32 vrf_id);
/**
* @brief Update NAT44 session limit flushing all data (session limit, vrf id)
*
* @param session_limit Session limit
* @param vrf_id VRF id
* @return 0 on success, non-zero value otherwise
*/
int nat44_update_session_limit (u32 session_limit, u32 vrf_id);
void expire_per_vrf_sessions (u32 fib_index);
int snat_static_mapping_match (vlib_main_t *vm, ip4_address_t match_addr,
u16 match_port, u32 match_fib_index,
ip_protocol_t match_protocol,
ip4_address_t *mapping_addr, u16 *mapping_port,
u32 *mapping_fib_index, int by_external,
u8 *is_addr_only, twice_nat_type_t *twice_nat,
lb_nat_type_t *lb, ip4_address_t *ext_host_addr,
u8 *is_identity_nat,
snat_static_mapping_t **out);
u32 get_thread_idx_by_port (u16 e_port);
u32 nat_calc_bihash_buckets (u32 n_elts);
void nat44_addresses_free (snat_address_t **addresses);
void nat44_ed_sessions_clear ();
int nat44_ed_set_frame_queue_nelts (u32 frame_queue_nelts);
void nat_6t_l3_l4_csum_calc (nat_6t_flow_t *f);
snat_static_mapping_t *nat44_ed_sm_i2o_lookup (snat_main_t *sm,
ip4_address_t addr, u16 port,
u32 fib_index, u8 proto);
snat_static_mapping_t *nat44_ed_sm_o2i_lookup (snat_main_t *sm,
ip4_address_t addr, u16 port,
u32 fib_index, u8 proto);
void nat_syslog_nat44_sadd (u32 ssubix, u32 sfibix, ip4_address_t *isaddr,
u16 isport, ip4_address_t *idaddr, u16 idport,
ip4_address_t *xsaddr, u16 xsport,
ip4_address_t *xdaddr, u16 xdport, u8 proto,
u8 is_twicenat);
void nat_syslog_nat44_sdel (u32 ssubix, u32 sfibix, ip4_address_t *isaddr,
u16 isport, ip4_address_t *idaddr, u16 idport,
ip4_address_t *xsaddr, u16 xsport,
ip4_address_t *xdaddr, u16 xdport, u8 proto,
u8 is_twicenat);
typedef enum
{
NAT_ED_TRNSL_ERR_SUCCESS = 0,
NAT_ED_TRNSL_ERR_TRANSLATION_FAILED = 1,
NAT_ED_TRNSL_ERR_FLOW_MISMATCH = 2,
NAT_ED_TRNSL_ERR_PACKET_TRUNCATED = 3,
NAT_ED_TRNSL_ERR_INNER_IP_CORRUPT = 4,
NAT_ED_TRNSL_ERR_INVALID_CSUM = 5,
} nat_translation_error_e;
nat_translation_error_e nat_6t_flow_buf_translate_i2o (
vlib_main_t *vm, snat_main_t *sm, vlib_buffer_t *b, ip4_header_t *ip,
nat_6t_flow_t *f, ip_protocol_t proto, int is_output_feature);
nat_translation_error_e nat_6t_flow_buf_translate_o2i (
vlib_main_t *vm, snat_main_t *sm, vlib_buffer_t *b, ip4_header_t *ip,
nat_6t_flow_t *f, ip_protocol_t proto, int is_output_feature);
#endif /* __included_nat44_ed_h__ */
/*
* fd.io coding-style-patch-verification: ON
*
* Local Variables:
* eval: (c-set-style "gnu")
* End:
*/