20c02cb133
Change-Id: Iffe77bf2a05ced41474540ff54a842101aad7c41 Signed-off-by: Dave Barach <dave@barachs.net>
182 lines
4.0 KiB
C
182 lines
4.0 KiB
C
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/*
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* snat.h - simple nat definitions
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*
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* Copyright (c) 2016 Cisco and/or its affiliates.
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at:
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#ifndef __included_snat_h__
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#define __included_snat_h__
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#include <vnet/vnet.h>
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#include <vnet/ip/ip.h>
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#include <vnet/ethernet/ethernet.h>
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#include <vnet/ip/icmp46_packet.h>
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#include <vnet/api_errno.h>
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#include <vppinfra/bihash_8_8.h>
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#include <vppinfra/dlist.h>
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#include <vppinfra/error.h>
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#include <vlibapi/api.h>
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/* Key */
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typedef struct {
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union
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{
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struct
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{
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ip4_address_t addr;
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u16 port;
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u16 protocol:3,
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fib_index:13;
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};
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u64 as_u64;
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};
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} snat_session_key_t;
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typedef struct {
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union
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{
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struct
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{
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ip4_address_t addr;
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u32 fib_index;
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};
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u64 as_u64;
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};
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} snat_user_key_t;
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typedef enum {
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SNAT_PROTOCOL_UDP = 0,
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SNAT_PROTOCOL_TCP,
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SNAT_PROTOCOL_ICMP,
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} snat_protocol_t;
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typedef CLIB_PACKED(struct {
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snat_session_key_t out2in; /* 0-15 */
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snat_session_key_t in2out; /* 16-31 */
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u32 flags; /* 32-35 */
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/* per-user translations */
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u32 per_user_index; /* 36-39 */
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u32 per_user_list_head_index; /* 40-43 */
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/* Last heard timer */
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f64 last_heard; /* 44-51 */
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u64 total_bytes; /* 52-59 */
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u32 total_pkts; /* 60-63 */
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/* Outside address */
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u32 outside_address_index; /* 64-67 */
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}) snat_session_t;
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#define SNAT_SESSION_STATIC (1<<0)
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typedef struct {
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ip4_address_t addr;
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u32 sessions_per_user_list_head_index;
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u32 nsessions;
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} snat_user_t;
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typedef struct {
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ip4_address_t addr;
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u32 busy_ports;
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uword * busy_port_bitmap;
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} snat_address_t;
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typedef struct {
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/* Main lookup tables */
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clib_bihash_8_8_t out2in;
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clib_bihash_8_8_t in2out;
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/* Find-a-user => src address lookup */
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clib_bihash_8_8_t user_hash;
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/* User pool */
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snat_user_t * users;
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/* Session pool */
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snat_session_t * sessions;
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/* Vector of outside addresses */
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snat_address_t * addresses;
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/* Pool of doubly-linked list elements */
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dlist_elt_t * list_pool;
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/* Randomize port allocation order */
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u32 random_seed;
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/* ip4 feature path indices */
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u32 rx_feature_in2out;
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u32 rx_feature_out2in;
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/* Config parameters */
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u32 translation_buckets;
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u32 translation_memory_size;
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u32 user_buckets;
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u32 user_memory_size;
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u32 max_translations_per_user;
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u32 outside_vrf_id;
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u32 outside_fib_index;
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/* API message ID base */
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u16 msg_id_base;
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/* convenience */
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vlib_main_t * vlib_main;
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vnet_main_t * vnet_main;
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ip4_main_t * ip4_main;
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ip_lookup_main_t * ip4_lookup_main;
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ethernet_main_t * ethernet_main;
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api_main_t * api_main;
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} snat_main_t;
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extern snat_main_t snat_main;
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extern vlib_node_registration_t snat_in2out_node;
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extern vlib_node_registration_t snat_out2in_node;
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void snat_free_outside_address_and_port (snat_main_t * sm,
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snat_session_key_t * k,
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u32 address_index);
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int snat_alloc_outside_address_and_port (snat_main_t * sm,
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snat_session_key_t * k,
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u32 * address_indexp);
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format_function_t format_snat_user;
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typedef struct {
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u32 cached_sw_if_index;
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u32 cached_ip4_address;
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} snat_runtime_t;
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/*
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* Why is this here? Because we don't need to touch this layer to
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* simply reply to an icmp. We need to change id to a unique
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* value to NAT an echo request/reply.
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*/
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typedef struct {
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u16 identifier;
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u16 sequence;
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} icmp_echo_header_t;
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#endif /* __included_snat_h__ */
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