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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;
+ ethernet_main_t * ethernet_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__ */