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/*
* 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_l2sess_h__
#define __included_l2sess_h__
#include <vnet/vnet.h>
#include <vnet/ip/ip.h>
#include <vnet/ethernet/ethernet.h>
#include <vppinfra/hash.h>
#include <vppinfra/error.h>
#include <vppinfra/elog.h>
#include <vppinfra/timing_wheel.h>
#include <vnet/l2/l2_output.h>
#include <vnet/l2/l2_input.h>
#define _(node_name, node_var, is_out, is_ip6, is_track)
#undef _
#define foreach_l2sess_node \
_("aclp-l2s-input-ip4-add", l2sess_in_ip4_add, 0, 0, 0) \
_("aclp-l2s-input-ip6-add", l2sess_in_ip6_add, 0, 1, 0) \
_("aclp-l2s-output-ip4-add", l2sess_out_ip4_add, 1, 0, 0) \
_("aclp-l2s-output-ip6-add", l2sess_out_ip6_add, 1, 1, 0) \
_("aclp-l2s-input-ip4-track", l2sess_in_ip4_track, 0, 0, 1) \
_("aclp-l2s-input-ip6-track", l2sess_in_ip6_track, 0, 1, 1) \
_("aclp-l2s-output-ip4-track",l2sess_out_ip4_track, 1, 0, 1) \
_("aclp-l2s-output-ip6-track", l2sess_out_ip6_track, 1, 1, 1)
#define _(node_name, node_var, is_out, is_ip6, is_track) \
extern vlib_node_registration_t node_var;
foreach_l2sess_node
#undef _
#define TCP_FLAG_FIN 0x01
#define TCP_FLAG_SYN 0x02
#define TCP_FLAG_RST 0x04
#define TCP_FLAG_PUSH 0x08
#define TCP_FLAG_ACK 0x10
#define TCP_FLAG_URG 0x20
#define TCP_FLAG_ECE 0x40
#define TCP_FLAG_CWR 0x80
#define TCP_FLAGS_RSTFINACKSYN (TCP_FLAG_RST + TCP_FLAG_FIN + TCP_FLAG_SYN + TCP_FLAG_ACK)
#define TCP_FLAGS_ACKSYN (TCP_FLAG_SYN + TCP_FLAG_ACK)
typedef struct {
ip46_address_t addr;
u64 active_time;
u64 n_packets;
u64 n_bytes;
u16 port;
} l2s_session_side_t;
enum {
L2S_SESSION_SIDE_IN = 0,
L2S_SESSION_SIDE_OUT,
L2S_N_SESSION_SIDES
};
typedef struct {
u64 create_time;
l2s_session_side_t side[L2S_N_SESSION_SIDES];
u8 l4_proto;
u8 is_ip6;
u16 tcp_flags_seen; /* u16 because of two sides */
} l2s_session_t;
#define PROD
#ifdef PROD
#define UDP_SESSION_IDLE_TIMEOUT_SEC 600
#define TCP_SESSION_IDLE_TIMEOUT_SEC (3600*24)
#define TCP_SESSION_TRANSIENT_TIMEOUT_SEC 120
#else
#define UDP_SESSION_IDLE_TIMEOUT_SEC 15
#define TCP_SESSION_IDLE_TIMEOUT_SEC 15
#define TCP_SESSION_TRANSIENT_TIMEOUT_SEC 5
#endif
typedef struct {
/*
* the next two fields are present for all nodes, but
* only one of them is used per node - depending
* on whether the node is an input or output one.
*/
#define _(node_name, node_var, is_out, is_ip6, is_track) \
u32 node_var ## _input_next_node_index[32]; \
l2_output_next_nodes_st node_var ## _next_nodes;
foreach_l2sess_node
#undef _
l2_output_next_nodes_st output_next_nodes;
/* Next indices of the tracker nodes */
u32 next_slot_track_node_by_is_ip6_is_out[2][2];
/*
* Pairing of "forward" and "reverse" tables by table index.
* Each relationship has two entries - for one and the other table,
* so it is bidirectional.
*/
u32 *fwd_to_rev_by_table_index;
/*
* The vector of per-interface session pools
*/
l2s_session_t *sessions;
/* The session timeouts */
u64 tcp_session_transient_timeout;
u64 tcp_session_idle_timeout;
u64 udp_session_idle_timeout;
/* Timing wheel to time out the idle sessions */
timing_wheel_t timing_wheel;
u32 *data_from_advancing_timing_wheel;
u64 timer_wheel_next_expiring_time;
u64 timer_wheel_tick;
/* convenience */
vlib_main_t * vlib_main;
vnet_main_t * vnet_main;
/* Counter(s) */
u64 counter_attempted_delete_free_session;
} l2sess_main_t;
l2sess_main_t l2sess_main;
/* Just exposed for acl.c */
void
l2sess_vlib_plugin_register (vlib_main_t * vm, void * hh,
int from_early_init);
#endif /* __included_l2sess_h__ */
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