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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 struct {
+ union
+ {
+ struct
+ {
+ ip4_address_t addr;
+ u16 port;
+ u16 fib_index;
+ };
+ u64 as_u64;
+ };
+} snat_static_mapping_key_t;
+
+
+typedef enum {
+ SNAT_PROTOCOL_UDP = 0,
+ SNAT_PROTOCOL_TCP,
+ SNAT_PROTOCOL_ICMP,
+} snat_protocol_t;
+
+
+#define SNAT_SESSION_FLAG_STATIC_MAPPING 1
+
+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;
+
+
+typedef struct {
+ ip4_address_t addr;
+ u32 sessions_per_user_list_head_index;
+ u32 nsessions;
+ u32 nstaticsessions;
+} snat_user_t;
+
+typedef struct {
+ ip4_address_t addr;
+ u32 busy_ports;
+ uword * busy_port_bitmap;
+} snat_address_t;
+
+typedef struct {
+ ip4_address_t local_addr;
+ ip4_address_t external_addr;
+ u16 local_port;
+ u16 external_port;
+ u8 addr_only;
+ u32 vrf_id;
+ u32 fib_index;
+} snat_static_mapping_t;
+
+typedef struct {
+ u32 sw_if_index;
+ u8 is_inside;
+} snat_interface_t;
+
+typedef struct {
+ /* User pool */
+ snat_user_t * users;
+
+ /* Session pool */
+ snat_session_t * sessions;
+
+ /* Pool of doubly-linked list elements */
+ dlist_elt_t * list_pool;
+} snat_main_per_thread_data_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;
+
+ /* Non-translated packets worker lookup => src address + VRF */
+ clib_bihash_8_8_t worker_by_in;
+
+ /* Translated packets worker lookup => IP address + port number */
+ clib_bihash_8_8_t worker_by_out;
+
+ u32 num_workers;
+ u32 first_worker_index;
+ u32 next_worker;
+ u32 * workers;
+
+ /* 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;
+
+ /* Interface pool */
+ snat_interface_t * interfaces;
+
+ /* Vector of outside addresses */
+ snat_address_t * addresses;
+
+ /* Randomize port allocation order */
+ u32 random_seed;
+
+ /* Worker handoff index */
+ u32 fq_in2out_index;
+ u32 fq_out2in_index;
+
+ /* Config parameters */
+ u8 static_mapping_only;
+ u8 static_mapping_connection_tracking;
+ 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;
+ u32 inside_vrf_id;
+ u32 inside_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;
+extern vlib_node_registration_t snat_in2out_fast_node;
+extern vlib_node_registration_t snat_out2in_fast_node;
+extern vlib_node_registration_t snat_in2out_worker_handoff_node;
+extern vlib_node_registration_t snat_out2in_worker_handoff_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);
+
+int snat_static_mapping_match (snat_main_t * sm,
+ snat_session_key_t match,
+ snat_session_key_t * mapping,
+ u8 by_external);
+
+format_function_t format_snat_user;
+
+typedef struct {
+ u32 cached_sw_if_index;
+ u32 cached_ip4_address;
+} snat_runtime_t;
+
+/** \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
+
+/*
+ * 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__ */