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gerrit.nordix.org / fdio / vpp / c05e2852f6755f38065e633a3c1bcf7a502e1bf3 / . / src / plugins / nat / nat.h
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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 nat.c
* NAT plugin global declarations
*/
#ifndef __included_nat_h__
#define __included_nat_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/dlist.h>
#include <vppinfra/error.h>
#include <vlibapi/api.h>
#include <vlib/log.h>
#include <vppinfra/bihash_16_8.h>
#include <nat/lib/lib.h>
#include <nat/lib/inlines.h>
/* number of worker handoff frame queue elements */
#define NAT_FQ_NELTS 64
/* 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) \
_(0x08, IS_OUT2IN_DPO)
typedef enum nat44_config_flags_t_
{
#define _(n,f) NAT44_API_##f = n,
foreach_nat44_config_flag
#undef _
} nat44_config_flags_t;
typedef struct
{
/* nat44 plugin features */
u8 static_mapping_only;
u8 connection_tracking;
u8 endpoint_dependent;
u8 out2in_dpo;
u32 inside_vrf;
u32 outside_vrf;
/* maximum number of users */
u32 users;
/* maximum number of sessions */
u32 sessions;
/* maximum number of ssessions per user */
u32 user_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_OUT2IN_ED_HANDOFF,
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;
/* user (internal host) key */
typedef struct
{
union
{
struct
{
ip4_address_t addr;
u32 fib_index;
};
u64 as_u64;
};
} snat_user_key_t;
/* External address and port allocation modes */
#define foreach_nat_addr_and_port_alloc_alg \
_(0, DEFAULT, "default") \
_(1, MAPE, "map-e") \
_(2, RANGE, "port-range")
typedef enum
{
#define _(v, N, s) NAT_ADDR_AND_PORT_ALLOC_ALG_##N = v,
foreach_nat_addr_and_port_alloc_alg
#undef _
} nat_addr_and_port_alloc_alg_t;
/* Session state */
#define foreach_snat_session_state \
_(0, UNKNOWN, "unknown") \
_(1, UDP_ACTIVE, "udp-active") \
_(2, TCP_SYN_SENT, "tcp-syn-sent") \
_(3, TCP_ESTABLISHED, "tcp-established") \
_(4, TCP_FIN_WAIT, "tcp-fin-wait") \
_(5, TCP_CLOSE_WAIT, "tcp-close-wait") \
_(6, TCP_CLOSING, "tcp-closing") \
_(7, TCP_LAST_ACK, "tcp-last-ack") \
_(8, TCP_CLOSED, "tcp-closed") \
_(9, ICMP_ACTIVE, "icmp-active")
typedef enum
{
#define _(v, N, s) SNAT_SESSION_##N = v,
foreach_snat_session_state
#undef _
} snat_session_state_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") \
_(TCP_CLOSED, "drops due to TCP in transitory timeout")
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_nat44_handoff_error \
_(CONGESTION_DROP, "congestion drop") \
_(SAME_WORKER, "same worker") \
_(DO_HANDOFF, "do handoff")
typedef enum
{
#define _(sym,str) NAT44_HANDOFF_ERROR_##sym,
foreach_nat44_handoff_error
#undef _
NAT44_HANDOFF_N_ERROR,
} nat44_handoff_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") \
_(MAX_USER_SESS_EXCEEDED, "max user sessions exceeded") \
_(CANNOT_CREATE_USER, "cannot create NAT user") \
_(NON_SYN, "non-SYN packet try to create session") \
_(TCP_CLOSED, "drops due to TCP in transitory timeout")
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;
/* Endpoint dependent TCP session state */
#define NAT44_SES_I2O_FIN 1
#define NAT44_SES_O2I_FIN 2
#define NAT44_SES_I2O_FIN_ACK 4
#define NAT44_SES_O2I_FIN_ACK 8
#define NAT44_SES_I2O_SYN 16
#define NAT44_SES_O2I_SYN 32
#define NAT44_SES_RST 64
/* Session flags */
#define SNAT_SESSION_FLAG_STATIC_MAPPING 1
#define SNAT_SESSION_FLAG_UNKNOWN_PROTO 2
#define SNAT_SESSION_FLAG_LOAD_BALANCING 4
#define SNAT_SESSION_FLAG_TWICE_NAT 8
#define SNAT_SESSION_FLAG_ENDPOINT_DEPENDENT 16
#define SNAT_SESSION_FLAG_FWD_BYPASS 32
#define SNAT_SESSION_FLAG_AFFINITY 64
#define SNAT_SESSION_FLAG_EXACT_ADDRESS 128
/* NAT interface flags */
#define NAT_INTERFACE_FLAG_IS_INSIDE 1
#define NAT_INTERFACE_FLAG_IS_OUTSIDE 2
/* Static mapping flags */
#define NAT_STATIC_MAPPING_FLAG_ADDR_ONLY 1
#define NAT_STATIC_MAPPING_FLAG_OUT2IN_ONLY 2
#define NAT_STATIC_MAPPING_FLAG_IDENTITY_NAT 4
#define NAT_STATIC_MAPPING_FLAG_LB 8
#define NAT_STATIC_MAPPING_FLAG_EXACT_ADDRESS 16
/* *INDENT-OFF* */
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;
/* *INDENT-ON* */
/* *INDENT-OFF* */
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;
nat_protocol_t nat_proto;
/* Flags */
u32 flags;
/* Per-user translations */
u32 per_user_index;
u32 per_user_list_head_index;
/* 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 */
u8 state;
u32 i2o_fin_seq;
u32 o2i_fin_seq;
u64 tcp_closed_timestamp;
/* user index */
u32 user_index;
/* per vrf sessions index */
u32 per_vrf_sessions_index;
}) snat_session_t;
/* *INDENT-ON* */
typedef struct
{
ip4_address_t addr;
u32 fib_index;
u32 sessions_per_user_list_head_index;
u32 nsessions;
u32 nstaticsessions;
} snat_user_t;
typedef struct
{
ip4_address_t addr;
u32 fib_index;
/* *INDENT-OFF* */
#define _(N, i, n, s) \
u32 busy_##n##_ports; \
u32 * busy_##n##_ports_per_thread; \
u32 busy_##n##_port_refcounts[65535];
foreach_nat_protocol
#undef _
/* *INDENT-ON* */
} snat_address_t;
typedef struct
{
u32 fib_index;
u32 ref_count;
} nat_fib_t;
typedef struct
{
u32 fib_index;
u32 refcount;
} nat_outside_fib_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
{
/* prefered 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;
/* is twice-nat */
twice_nat_type_t twice_nat;
/* local FIB table */
u32 vrf_id;
u32 fib_index;
/* protocol */
nat_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
{
ip4_address_t l_addr;
ip4_address_t pool_addr;
u16 l_port;
u16 e_port;
u32 sw_if_index;
u32 vrf_id;
nat_protocol_t proto;
u32 flags;
int addr_only;
int twice_nat;
int is_add;
int out2in_only;
int identity_nat;
int exact;
u8 *tag;
} snat_static_map_resolve_t;
typedef struct
{
/* Main lookup tables */
clib_bihash_8_8_t out2in;
clib_bihash_8_8_t in2out;
/* Endpoint dependent sessions lookup tables */
clib_bihash_16_8_t in2out_ed;
/* 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;
/* 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;
/* ICMP session match function */
typedef u32 (snat_icmp_match_function_t) (struct snat_main_s * sm,
vlib_node_runtime_t * node,
u32 thread_index,
vlib_buffer_t * b0,
ip4_header_t * ip0,
ip4_address_t * addr,
u16 * port,
u32 * fib_index,
nat_protocol_t * proto,
void *d, void *e,
u8 * dont_translate);
/* Return worker thread index for given packet */
typedef u32 (snat_get_worker_in2out_function_t) (ip4_header_t * ip,
u32 rx_fib_index,
u8 is_output);
typedef u32 (snat_get_worker_out2in_function_t) (vlib_buffer_t * b,
ip4_header_t * ip,
u32 rx_fib_index,
u8 is_output);
/* 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,
nat_protocol_t proto,
ip4_address_t * addr,
u16 * port,
u16 port_per_thread,
u32 snat_thread_index);
#define foreach_nat_counter _ (tcp) _ (udp) _ (icmp) _ (other) _ (drops)
typedef struct snat_main_s
{
/* ICMP session match functions */
snat_icmp_match_function_t *icmp_match_in2out_cb;
snat_icmp_match_function_t *icmp_match_out2in_cb;
/* Thread settings */
u32 num_workers;
u32 first_worker_index;
u32 *workers;
snat_get_worker_in2out_function_t *worker_in2out_cb;
snat_get_worker_out2in_function_t *worker_out2in_cb;
u16 port_per_thread;
/* Per thread data */
snat_main_per_thread_data_t *per_thread_data;
/* Find a static mapping by local */
clib_bihash_8_8_t static_mapping_by_local;
/* Find a static mapping by external */
clib_bihash_8_8_t static_mapping_by_external;
/* Static mapping pool */
snat_static_mapping_t *static_mappings;
/* Endpoint-dependent out2in mappings */
clib_bihash_16_8_t out2in_ed;
/* Interface pool */
snat_interface_t *interfaces;
snat_interface_t *output_feature_interfaces;
/* Vector of outside addresses */
snat_address_t *addresses;
/* Address and port allocation function */
nat_alloc_out_addr_and_port_function_t *alloc_addr_and_port;
/* Address and port allocation type */
nat_addr_and_port_alloc_alg_t addr_and_port_alloc_alg;
/* Port set parameters (MAP-E) */
u8 psid_offset;
u8 psid_length;
u16 psid;
/* Port range parameters */
u16 start_port;
u16 end_port;
/* vector of fibs */
nat_fib_t *fibs;
/* vector of outside fibs */
nat_outside_fib_t *outside_fibs;
/* Vector of twice NAT addresses for external hosts */
snat_address_t *twice_nat_addresses;
/* sw_if_indices whose intfc addresses should be auto-added */
u32 *auto_add_sw_if_indices;
u32 *auto_add_sw_if_indices_twice_nat;
/* vector of interface address static mappings to resolve. */
snat_static_map_resolve_t *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;
/* node indexes */
u32 error_node_index;
/* handoff fq nodes */
u32 handoff_out2in_index;
u32 handoff_in2out_index;
u32 handoff_in2out_output_index;
/* respect feature arc nodes */
u32 pre_out2in_node_index;
u32 pre_in2out_node_index;
u32 out2in_node_index;
u32 in2out_node_index;
u32 in2out_output_node_index;
u32 in2out_fast_node_index;
u32 in2out_slowpath_node_index;
u32 in2out_slowpath_output_node_index;
u32 out2in_fast_node_index;
u32 ei_out2in_node_index;
u32 ei_in2out_node_index;
u32 ei_in2out_output_node_index;
u32 ed_out2in_node_index;
u32 ed_in2out_node_index;
u32 ed_in2out_output_node_index;
u32 ed_in2out_slowpath_node_index;
u32 ed_out2in_slowpath_node_index;
u32 hairpinning_node_index;
u32 hairpin_dst_node_index;
u32 hairpin_src_node_index;
u32 ed_hairpinning_node_index;
u32 ed_hairpin_dst_node_index;
u32 ed_hairpin_src_node_index;
nat44_config_t rconfig;
//nat44_config_t cconfig;
/* If forwarding is enabled */
u8 forwarding_enabled;
/* Config parameters */
u8 endpoint_dependent;
u8 out2in_dpo;
/* static mapping config */
u8 static_mapping_only;
u8 static_mapping_connection_tracking;
/* 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;
u32 max_users_per_thread;
u32 user_buckets;
u32 max_translations_per_user;
u32 outside_vrf_id;
u32 outside_fib_index;
u32 inside_vrf_id;
u32 inside_fib_index;
nat_timeouts_t timeouts;
/* TCP MSS clamping */
u16 mss_clamping;
/* counters */
vlib_simple_counter_main_t total_users;
vlib_simple_counter_main_t total_sessions;
vlib_simple_counter_main_t user_limit_reached;
#define _(x) vlib_simple_counter_main_t x;
struct
{
struct
{
struct
{
foreach_nat_counter;
} in2out;
struct
{
foreach_nat_counter;
} out2in;
struct
{
foreach_nat_counter;
} in2out_ed;
struct
{
foreach_nat_counter;
} out2in_ed;
} fastpath;
struct
{
struct
{
foreach_nat_counter;
} in2out;
struct
{
foreach_nat_counter;
} out2in;
struct
{
foreach_nat_counter;
} in2out_ed;
struct
{
foreach_nat_counter;
} out2in_ed;
} 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 */
api_main_t *api_main;
ip4_main_t *ip4_main;
ip_lookup_main_t *ip4_lookup_main;
fib_source_t fib_src_hi;
fib_source_t fib_src_low;
/* nat44 plugin enabled */
u8 enabled;
vnet_main_t *vnet_main;
} snat_main_t;
typedef struct
{
u32 thread_index;
f64 now;
} nat44_is_idle_session_ctx_t;
typedef struct
{
u32 cached_sw_if_index;
u32 cached_ip4_address;
} snat_runtime_t;
extern snat_main_t snat_main;
// nat pre ed next_node feature classification
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 snat_in2out_node;
extern vlib_node_registration_t snat_in2out_output_node;
extern vlib_node_registration_t snat_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;
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 fib_source_t nat_fib_src_hi;
extern fib_source_t nat_fib_src_low;
/* format functions */
format_function_t format_snat_user;
format_function_t format_snat_static_mapping;
format_function_t format_snat_static_map_to_resolve;
format_function_t format_snat_session;
format_function_t format_snat_key;
format_function_t format_static_mapping_key;
format_function_t format_nat_protocol;
format_function_t format_nat_addr_and_port_alloc_alg;
/* unformat functions */
unformat_function_t unformat_nat_protocol;
/** \brief Check if SNAT session is created from static mapping.
@param s SNAT session
@return 1 if SNAT session is created from static mapping otherwise 0
*/
#define snat_is_session_static(s) (s->flags & SNAT_SESSION_FLAG_STATIC_MAPPING)
/** \brief Check if SNAT session for unknown protocol.
@param s SNAT session
@return 1 if SNAT session for unknown protocol otherwise 0
*/
#define snat_is_unk_proto_session(s) (s->flags & SNAT_SESSION_FLAG_UNKNOWN_PROTO)
/** \brief Check if NAT session is twice NAT.
@param s NAT session
@return 1 if NAT session is twice NAT
*/
#define is_twice_nat_session(s) (s->flags & SNAT_SESSION_FLAG_TWICE_NAT)
/** \brief Check if NAT session is load-balancing.
@param s NAT session
@return 1 if NAT session is load-balancing
*/
#define is_lb_session(s) (s->flags & SNAT_SESSION_FLAG_LOAD_BALANCING)
/** \brief Check if NAT session is forwarding bypass.
@param s NAT session
@return 1 if NAT session is load-balancing
*/
#define is_fwd_bypass_session(s) (s->flags & SNAT_SESSION_FLAG_FWD_BYPASS)
/** \brief Check if NAT session is endpoint dependent.
@param s NAT session
@return 1 if NAT session is endpoint dependent
*/
#define is_ed_session(s) (s->flags & SNAT_SESSION_FLAG_ENDPOINT_DEPENDENT)
/** \brief Check if NAT session has affinity record.
@param s NAT session
@return 1 if NAT session has affinity record
*/
#define is_affinity_sessions(s) (s->flags & SNAT_SESSION_FLAG_AFFINITY)
/** \brief Check if exact pool address should be used.
@param s SNAT session
@return 1 if exact pool address or 0
*/
#define is_exact_address_session(s) (s->flags & SNAT_SESSION_FLAG_EXACT_ADDRESS)
/** \brief Check if NAT interface is inside.
@param i NAT interface
@return 1 if inside interface
*/
#define nat_interface_is_inside(i) i->flags & NAT_INTERFACE_FLAG_IS_INSIDE
/** \brief Check if NAT interface is outside.
@param i NAT interface
@return 1 if outside interface
*/
#define nat_interface_is_outside(i) i->flags & NAT_INTERFACE_FLAG_IS_OUTSIDE
/** \brief Check if NAT44 endpoint-dependent TCP session is closed.
@param s NAT session
@return 1 if session is closed
*/
#define nat44_is_ses_closed(s) s->state == 0xf
/** \brief Check if NAT static mapping is address only (1:1NAT).
@param sm NAT static mapping
@return 1 if 1:1NAT, 0 if 1:1NAPT
*/
#define is_addr_only_static_mapping(sm) (sm->flags & NAT_STATIC_MAPPING_FLAG_ADDR_ONLY)
/** \brief Check if NAT static mapping match only out2in direction.
@param sm NAT static mapping
@return 1 if rule match only out2in direction
*/
#define is_out2in_only_static_mapping(sm) (sm->flags & NAT_STATIC_MAPPING_FLAG_OUT2IN_ONLY)
/** \brief Check if NAT static mapping is identity NAT.
@param sm NAT static mapping
@return 1 if identity NAT
*/
#define is_identity_static_mapping(sm) (sm->flags & NAT_STATIC_MAPPING_FLAG_IDENTITY_NAT)
/** \brief Check if NAT static mapping is load-balancing.
@param sm NAT static mapping
@return 1 if load-balancing
*/
#define is_lb_static_mapping(sm) (sm->flags & NAT_STATIC_MAPPING_FLAG_LB)
/** \brief Check if exact pool address should be used.
@param s SNAT session
@return 1 if exact pool address or 0
*/
#define is_exact_address(s) (s->flags & NAT_STATIC_MAPPING_FLAG_EXACT_ADDRESS)
/** \brief Check if client initiating TCP connection (received SYN from client)
@param t TCP header
@return 1 if client initiating TCP connection
*/
always_inline bool
tcp_flags_is_init (u8 f)
{
return (f & TCP_FLAG_SYN) && !(f & TCP_FLAG_ACK);
}
/* logging */
#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_notice(...) \
vlib_log(VLIB_LOG_LEVEL_NOTICE, 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__)
/* NAT API Logging Levels */
#define foreach_nat_log_level \
_(0x00, LOG_NONE) \
_(0x01, LOG_ERROR) \
_(0x02, LOG_WARNING) \
_(0x03, LOG_NOTICE) \
_(0x04, LOG_INFO) \
_(0x05, LOG_DEBUG)
typedef enum nat_log_level_t_
{
#define _(n,f) SNAT_##f = n,
foreach_nat_log_level
#undef _
} nat_log_level_t;
#define nat_elog(_level, _str) \
do \
{ \
snat_main_t *sm = &snat_main; \
if (PREDICT_FALSE (sm->log_level >= _level)) \
{ \
ELOG_TYPE_DECLARE (e) = \
{ \
.format = "nat-msg " _str, \
.format_args = "", \
}; \
ELOG_DATA (&vlib_global_main.elog_main, e); \
} \
} while (0);
#define nat_elog_addr(_level, _str, _addr) \
do \
{ \
if (PREDICT_FALSE (sm->log_level >= _level)) \
{ \
ELOG_TYPE_DECLARE (e) = \
{ \
.format = "nat-msg " _str " %d.%d.%d.%d", \
.format_args = "i1i1i1i1", \
}; \
CLIB_PACKED(struct \
{ \
u8 oct1; \
u8 oct2; \
u8 oct3; \
u8 oct4; \
}) *ed; \
ed = ELOG_DATA (&vlib_global_main.elog_main, e); \
ed->oct4 = _addr >> 24; \
ed->oct3 = _addr >> 16; \
ed->oct2 = _addr >> 8; \
ed->oct1 = _addr; \
} \
} while (0);
#define nat_elog_debug_handoff(_str, _tid, _fib, _src, _dst) \
do \
{ \
if (PREDICT_FALSE (sm->log_level >= SNAT_LOG_DEBUG)) \
{ \
ELOG_TYPE_DECLARE (e) = \
{ \
.format = "nat-msg " _str " ip src: %d.%d.%d.%d dst: %d.%d.%d.%d" \
" tid from: %d to: %d fib: %d", \
.format_args = "i1i1i1i1i1i1i1i1i4i4i4", \
}; \
CLIB_PACKED(struct \
{ \
u8 src_oct1; \
u8 src_oct2; \
u8 src_oct3; \
u8 src_oct4; \
u8 dst_oct1; \
u8 dst_oct2; \
u8 dst_oct3; \
u8 dst_oct4; \
u32 ftid; \
u32 ttid; \
u32 fib; \
}) *ed; \
ed = ELOG_DATA (&vlib_global_main.elog_main, e); \
ed->src_oct1 = _src >> 24; \
ed->src_oct2 = _src >> 16; \
ed->src_oct3 = _src >> 8; \
ed->src_oct4 = _src; \
ed->dst_oct1 = _dst >> 24; \
ed->dst_oct2 = _dst >> 16; \
ed->dst_oct3 = _dst >> 8; \
ed->dst_oct4 = _dst; \
ed->ftid = vlib_get_thread_index (); \
ed->ttid = _tid; \
ed->fib = _fib; \
} \
} while (0);
#define nat_elog_debug_handoff_v2(_str, _prt, _fib, _src, _dst) \
do \
{ \
if (PREDICT_FALSE (sm->log_level >= SNAT_LOG_DEBUG)) \
{ \
ELOG_TYPE_DECLARE (e) = \
{ \
.format = "nat-msg " _str " ip_src:%d.%d.%d.%d ip_dst:%d.%d.%d.%d" \
" tid:%d prt:%d fib:%d", \
.format_args = "i1i1i1i1i1i1i1i1i4i4i4", \
}; \
CLIB_PACKED(struct \
{ \
u8 src_oct1; \
u8 src_oct2; \
u8 src_oct3; \
u8 src_oct4; \
u8 dst_oct1; \
u8 dst_oct2; \
u8 dst_oct3; \
u8 dst_oct4; \
u32 tid; \
u32 prt; \
u32 fib; \
}) *ed; \
ed = ELOG_DATA (&vlib_global_main.elog_main, e); \
ed->src_oct1 = _src >> 24; \
ed->src_oct2 = _src >> 16; \
ed->src_oct3 = _src >> 8; \
ed->src_oct4 = _src; \
ed->dst_oct1 = _dst >> 24; \
ed->dst_oct2 = _dst >> 16; \
ed->dst_oct3 = _dst >> 8; \
ed->dst_oct4 = _dst; \
ed->tid = vlib_get_thread_index (); \
ed->prt = _prt; \
ed->fib = _fib; \
} \
} while (0);
#define nat_elog_X1(_level, _fmt, _arg, _val1) \
do \
{ \
snat_main_t *sm = &snat_main; \
if (PREDICT_FALSE (sm->log_level >= _level)) \
{ \
ELOG_TYPE_DECLARE (e) = \
{ \
.format = "nat-msg " _fmt, \
.format_args = _arg, \
}; \
CLIB_PACKED(struct \
{ \
typeof (_val1) val1; \
}) *ed; \
ed = ELOG_DATA (&vlib_global_main.elog_main, e); \
ed->val1 = _val1; \
} \
} while (0);
#define nat_elog_notice(nat_elog_str) \
nat_elog(SNAT_LOG_INFO, "[notice] " nat_elog_str)
#define nat_elog_warn(nat_elog_str) \
nat_elog(SNAT_LOG_WARNING, "[warning] " nat_elog_str)
#define nat_elog_err(nat_elog_str) \
nat_elog(SNAT_LOG_ERROR, "[error] " nat_elog_str)
#define nat_elog_debug(nat_elog_str) \
nat_elog(SNAT_LOG_DEBUG, "[debug] " nat_elog_str)
#define nat_elog_info(nat_elog_str) \
nat_elog(SNAT_LOG_INFO, "[info] " nat_elog_str)
#define nat_elog_notice_X1(nat_elog_fmt_str, nat_elog_fmt_arg, nat_elog_val1) \
nat_elog_X1(SNAT_LOG_NOTICE, "[notice] " nat_elog_fmt_str, nat_elog_fmt_arg, nat_elog_val1)
#define nat_elog_warn_X1(nat_elog_fmt_str, nat_elog_fmt_arg, nat_elog_val1) \
nat_elog_X1(SNAT_LOG_WARNING, "[warning] " nat_elog_fmt_str, nat_elog_fmt_arg, nat_elog_val1)
#define nat_elog_err_X1(nat_elog_fmt_str, nat_elog_fmt_arg, nat_elog_val1) \
nat_elog_X1(SNAT_LOG_ERROR, "[error] " nat_elog_fmt_str, nat_elog_fmt_arg, nat_elog_val1)
#define nat_elog_debug_X1(nat_elog_fmt_str, nat_elog_fmt_arg, nat_elog_val1) \
nat_elog_X1(SNAT_LOG_DEBUG, "[debug] " nat_elog_fmt_str, nat_elog_fmt_arg, nat_elog_val1)
#define nat_elog_info_X1(nat_elog_fmt_str, nat_elog_fmt_arg, nat_elog_val1) \
nat_elog_X1(SNAT_LOG_INFO, "[info] " nat_elog_fmt_str, nat_elog_fmt_arg, nat_elog_val1)
/* ICMP session match functions */
u32 icmp_match_in2out_fast (snat_main_t * sm, vlib_node_runtime_t * node,
u32 thread_index, vlib_buffer_t * b0,
ip4_header_t * ip0, ip4_address_t * addr,
u16 * port, u32 * fib_index,
nat_protocol_t * proto, void *d, void *e,
u8 * dont_translate);
u32 icmp_match_in2out_slow (snat_main_t * sm, vlib_node_runtime_t * node,
u32 thread_index, vlib_buffer_t * b0,
ip4_header_t * ip0, ip4_address_t * addr,
u16 * port, u32 * fib_index,
nat_protocol_t * proto, void *d, void *e,
u8 * dont_translate);
u32 icmp_match_out2in_fast (snat_main_t * sm, vlib_node_runtime_t * node,
u32 thread_index, vlib_buffer_t * b0,
ip4_header_t * ip0, ip4_address_t * addr,
u16 * port, u32 * fib_index,
nat_protocol_t * proto, void *d, void *e,
u8 * dont_translate);
u32 icmp_match_out2in_slow (snat_main_t * sm, vlib_node_runtime_t * node,
u32 thread_index, vlib_buffer_t * b0,
ip4_header_t * ip0, ip4_address_t * addr,
u16 * port, u32 * fib_index,
nat_protocol_t * proto, void *d, void *e,
u8 * dont_translate);
/* ICMP endpoint-dependent session match functions */
u32 icmp_match_out2in_ed (snat_main_t * sm, vlib_node_runtime_t * node,
u32 thread_index, vlib_buffer_t * b0,
ip4_header_t * ip0, ip4_address_t * addr,
u16 * port, u32 * fib_index, nat_protocol_t * proto,
void *d, void *e, u8 * dont_translate);
u32 icmp_match_in2out_ed (snat_main_t * sm, vlib_node_runtime_t * node,
u32 thread_index, vlib_buffer_t * b0,
ip4_header_t * ip0, ip4_address_t * addr,
u16 * port, u32 * fib_index, nat_protocol_t * proto,
void *d, void *e, u8 * dont_translate);
u32 icmp_in2out (snat_main_t * sm, vlib_buffer_t * b0, ip4_header_t * ip0,
icmp46_header_t * icmp0, u32 sw_if_index0, u32 rx_fib_index0,
vlib_node_runtime_t * node, u32 next0, u32 thread_index,
void *d, void *e);
u32 icmp_out2in (snat_main_t * sm, vlib_buffer_t * b0, ip4_header_t * ip0,
icmp46_header_t * icmp0, u32 sw_if_index0, u32 rx_fib_index0,
vlib_node_runtime_t * node, u32 next0, u32 thread_index,
void *d, void *e);
/* hairpinning functions */
u32 snat_icmp_hairpinning (snat_main_t * sm, vlib_buffer_t * b0,
ip4_header_t * ip0, icmp46_header_t * icmp0,
int is_ed);
void nat_hairpinning_sm_unknown_proto (snat_main_t * sm, vlib_buffer_t * b,
ip4_header_t * ip);
void nat44_ed_hairpinning_unknown_proto (snat_main_t * sm, vlib_buffer_t * b,
ip4_header_t * ip);
int snat_hairpinning (vlib_main_t * vm, vlib_node_runtime_t * node,
snat_main_t * sm, vlib_buffer_t * b0,
ip4_header_t * ip0, udp_header_t * udp0,
tcp_header_t * tcp0, u32 proto0, int is_ed,
int do_trace);
/* Call back functions for clib_bihash_add_or_overwrite_stale */
int nat44_i2o_ed_is_idle_session_cb (clib_bihash_kv_16_8_t * kv, void *arg);
int nat44_o2i_ed_is_idle_session_cb (clib_bihash_kv_16_8_t * kv, void *arg);
int nat44_i2o_is_idle_session_cb (clib_bihash_kv_8_8_t * kv, void *arg);
int nat44_o2i_is_idle_session_cb (clib_bihash_kv_8_8_t * kv, void *arg);
/**
* @brief Enable NAT44 plugin
*
* @param c nat44_config_t
*
* @return 0 on success, non-zero value otherwise
*/
int nat44_plugin_enable (nat44_config_t c);
/**
* @brief Disable NAT44 plugin
*
* @return 0 on success, non-zero value otherwise
*/
int nat44_plugin_disable ();
/**
* @brief Add external address to NAT44 pool
*
* @param sm snat global configuration data
* @param addr IPv4 address
* @param vrf_id VRF id of tenant, ~0 means independent of VRF
* @param twice_nat 1 if twice NAT address
*
* @return 0 on success, non-zero value otherwise
*/
int snat_add_address (snat_main_t * sm, ip4_address_t * addr, u32 vrf_id,
u8 twice_nat);
/**
* @brief Delete external address from NAT44 pool
*
* @param sm snat global configuration data
* @param addr IPv4 address
* @param delete_sm 1 if delete static mapping using address
* @param twice_nat 1 if twice NAT address
*
* @return 0 on success, non-zero value otherwise
*/
int snat_del_address (snat_main_t * sm, ip4_address_t addr, u8 delete_sm,
u8 twice_nat);
/**
* @brief Add/delete external address to FIB DPO (out2in DPO mode)
*
* @param addr IPv4 address
* @param is_add 1 = add, 0 = delete
*
* @return 0 on success, non-zero value otherwise
*/
void nat44_add_del_address_dpo (ip4_address_t addr, u8 is_add);
/**
* @brief Add/delete NAT44 static mapping
*
* @param l_addr local IPv4 address
* @param e_addr external IPv4 address
* @param l_port local port number
* @param e_port external port number
* @param vrf_id local VRF ID
* @param addr_only 1 = 1:1NAT, 0 = 1:1NAPT
* @param sw_if_index use interface address as external IPv4 address
* @param proto L4 protocol
* @param is_add 1 = add, 0 = delete
* @param twice_nat twice-nat mode
* @param out2in_only if 1 rule match only out2in direction
* @param tag opaque string tag
* @param identity_nat identity NAT
* @param pool_addr pool IPv4 address
* @param exact 1 = exact pool address
*
* @return 0 on success, non-zero value otherwise
*/
int snat_add_static_mapping (ip4_address_t l_addr, ip4_address_t e_addr,
u16 l_port, u16 e_port, u32 vrf_id,
int addr_only, u32 sw_if_index,
nat_protocol_t proto, int is_add,
twice_nat_type_t twice_nat, u8 out2in_only,
u8 * tag, u8 identity_nat,
ip4_address_t pool_addr, int exact);
/**
* @brief Add/delete static mapping with load-balancing (multiple backends)
*
* @param e_addr external IPv4 address
* @param e_port external port number
* @param proto L4 protocol
* @param locals list of local backends
* @param is_add 1 = add, 0 = delete
* @param twice_nat twice-nat mode
* @param out2in_only if 1 rule match only out2in direction
* @param tag opaque string tag
* @param affinity 0 = disabled, otherwise client IP affinity sticky time
*
* @return 0 on success, non-zero value otherwise
*/
int nat44_add_del_lb_static_mapping (ip4_address_t e_addr, u16 e_port,
nat_protocol_t proto,
nat44_lb_addr_port_t * locals, u8 is_add,
twice_nat_type_t twice_nat,
u8 out2in_only, u8 * tag, u32 affinity);
int nat44_lb_static_mapping_add_del_local (ip4_address_t e_addr, u16 e_port,
ip4_address_t l_addr, u16 l_port,
nat_protocol_t proto, u32 vrf_id,
u8 probability, u8 is_add);
clib_error_t *nat44_api_hookup (vlib_main_t * vm);
/**
* @brief Set NAT plugin workers
*
* @param bitmap NAT workers bitmap
*
* @return 0 on success, non-zero value otherwise
*/
int snat_set_workers (uword * bitmap);
/**
* @brief Enable/disable NAT44 feature on the interface
*
* @param sw_if_index software index of the interface
* @param is_inside 1 = inside, 0 = outside
* @param is_del 1 = delete, 0 = add
*
* @return 0 on success, non-zero value otherwise
*/
int snat_interface_add_del (u32 sw_if_index, u8 is_inside, int is_del);
/**
* @brief Enable/disable NAT44 output feature on the interface (postrouting NAT)
*
* @param sw_if_index software index of the interface
* @param is_inside 1 = inside, 0 = outside
* @param is_del 1 = delete, 0 = add
*
* @return 0 on success, non-zero value otherwise
*/
int snat_interface_add_del_output_feature (u32 sw_if_index, u8 is_inside,
int is_del);
/**
* @brief Add/delete NAT44 pool address from specific interface
*
* @param sw_if_index software index of the interface
* @param is_del 1 = delete, 0 = add
* @param twice_nat 1 = twice NAT address for external hosts
*
* @return 0 on success, non-zero value otherwise
*/
int snat_add_interface_address (snat_main_t * sm, u32 sw_if_index, int is_del,
u8 twice_nat);
/**
* @brief Delete NAT44 session
*
* @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_del_session (snat_main_t * sm, ip4_address_t * addr, u16 port,
nat_protocol_t proto, u32 vrf_id, int is_in);
/**
* @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_del_ed_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);
/**
* @brief Free NAT44 session data (lookup keys, external address port)
*
* @param sm snat global configuration data
* @param s NAT session
* @param thread_index thread index
* @param is_ha is HA event
*/
void nat_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);
/**
* @brief Initialize NAT44 data
*
* @param tsm per thread data
*/
void nat44_db_init (snat_main_per_thread_data_t * tsm);
/**
* @brief Free NAT44 data
*
* @param tsm per thread data
*/
void nat44_db_free (snat_main_per_thread_data_t * tsm);
/**
* @brief Delete specific NAT44 EI user and his sessions
*
* @param addr IPv4 address
* @param fib_index FIB table index
*/
int nat44_ei_user_del (ip4_address_t * addr, u32 fib_index);
/**
* @brief Free all NAT44 sessions
*/
void nat44_sessions_clear ();
/**
* @brief Find or create NAT user
*
* @param sm snat global configuration data
* @param addr IPv4 address
* @param fib_index FIB table index
* @param thread_index thread index
*
* @return NAT user data structure on success otherwise zero value
*/
snat_user_t *nat_user_get_or_create (snat_main_t * sm,
ip4_address_t * addr, u32 fib_index,
u32 thread_index);
/**
* @brief Allocate new NAT session or recycle last used
*
* @param sm snat global configuration data
* @param u NAT user
* @param thread_index thread index
* @param now time now
*
* @return session data structure on success otherwise zero value
*/
snat_session_t *nat_session_alloc_or_recycle (snat_main_t * sm,
snat_user_t * u,
u32 thread_index, f64 now);
/**
* @brief Set address and port assignment algorithm for MAP-E CE
*
* @param psid Port Set Identifier value
* @param psid_offset number of offset bits
* @param psid_length length of PSID
*/
void nat_set_alloc_addr_and_port_mape (u16 psid, u16 psid_offset,
u16 psid_length);
/**
* @brief Set address and port assignment algorithm for port range
*
* @param start_port beginning of the port range
* @param end_port end of the port range
*/
void nat_set_alloc_addr_and_port_range (u16 start_port, u16 end_port);
/**
* @brief Set address and port assignment algorithm to default/standard
*/
void nat_set_alloc_addr_and_port_default (void);
/**
* @brief Free outside address and port pair
*
* @param addresses vector of outside addresses
* @param thread_index thread index
* @param key address, port and protocol
*/
void
snat_free_outside_address_and_port (snat_address_t * addresses,
u32 thread_index,
ip4_address_t * addr,
u16 port, nat_protocol_t protocol);
/**
* @brief Alloc outside address and port
*
* @param addresses vector of outside addresses
* @param fib_index FIB table index
* @param thread_index thread index
* @param port_per_thread number of ports per thread
* @param snat_thread_index NAT thread index
*
* @return 0 on success, non-zero value otherwise
*/
int snat_alloc_outside_address_and_port (snat_address_t * addresses,
u32 fib_index,
u32 thread_index,
nat_protocol_t proto,
ip4_address_t * addr,
u16 * port,
u16 port_per_thread,
u32 snat_thread_index);
void expire_per_vrf_sessions (u32 fib_index);
/**
* @brief Match NAT44 static mapping.
*
* @param key address and port to match
* @param addr external/local address of the matched mapping
* @param port port of the matched mapping
* @param fib_index fib index of the matched mapping
* @param by_external if 0 match by local address otherwise match by external
* address
* @param is_addr_only 1 if matched mapping is address only
* @param twice_nat matched mapping is twice NAT type
* @param lb 1 if matched mapping is load-balanced
* @param ext_host_addr external host address
* @param is_identity_nat 1 if indentity mapping
* @param out if !=0 set to pointer of the mapping structure
*
* @returns 0 if match found otherwise 1.
*/
int snat_static_mapping_match (snat_main_t * sm,
ip4_address_t match_addr,
u16 match_port,
u32 match_fib_index,
nat_protocol_t match_protocol,
ip4_address_t * mapping_addr,
u16 * mapping_port,
u32 * mapping_fib_index,
u8 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);
/**
* @brief Add/del NAT address to FIB.
*
* Add the external NAT address to the FIB as receive entries. This ensures
* that VPP will reply to ARP for this address and we don't need to enable
* proxy ARP on the outside interface.
*
* @param addr IPv4 address
* @param plen address prefix length
* @param sw_if_index software index of the outside interface
* @param is_add 0 = delete, 1 = add.
*/
void snat_add_del_addr_to_fib (ip4_address_t * addr,
u8 p_len, u32 sw_if_index, int is_add);
void
nat_ha_sadd_cb (ip4_address_t * in_addr, u16 in_port,
ip4_address_t * out_addr, u16 out_port,
ip4_address_t * eh_addr, u16 eh_port,
ip4_address_t * ehn_addr, u16 ehn_port, u8 proto,
u32 fib_index, u16 flags, u32 thread_index);
void
nat_ha_sdel_cb (ip4_address_t * out_addr, u16 out_port,
ip4_address_t * eh_addr, u16 eh_port, u8 proto, u32 fib_index,
u32 ti);
void
nat_ha_sref_cb (ip4_address_t * out_addr, u16 out_port,
ip4_address_t * eh_addr, u16 eh_port, u8 proto, u32 fib_index,
u32 total_pkts, u64 total_bytes, u32 thread_index);
void
nat_ha_sadd_ed_cb (ip4_address_t * in_addr, u16 in_port,
ip4_address_t * out_addr, u16 out_port,
ip4_address_t * eh_addr, u16 eh_port,
ip4_address_t * ehn_addr, u16 ehn_port, u8 proto,
u32 fib_index, u16 flags, u32 thread_index);
void
nat_ha_sdel_ed_cb (ip4_address_t * out_addr, u16 out_port,
ip4_address_t * eh_addr, u16 eh_port, u8 proto,
u32 fib_index, u32 ti);
void
nat_ha_sdel_ed_cb (ip4_address_t * out_addr, u16 out_port,
ip4_address_t * eh_addr, u16 eh_port, u8 proto,
u32 fib_index, u32 ti);
void
nat_ha_sref_ed_cb (ip4_address_t * out_addr, u16 out_port,
ip4_address_t * eh_addr, u16 eh_port, u8 proto,
u32 fib_index, u32 total_pkts, u64 total_bytes,
u32 thread_index);
/*
* 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;
typedef struct
{
u16 src_port, dst_port;
} tcp_udp_header_t;
u8 *format_user_kvp (u8 * s, va_list * args);
#endif /* __included_nat_h__ */
/*
* fd.io coding-style-patch-verification: ON
*
* Local Variables:
* eval: (c-set-style "gnu")
* End:
*/