/*
 * eset_wap (ESET Web Access Protection module)
 * Copyright (C) 1992-2023 ESET, spol. s r.o.
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <https://www.gnu.org/licenses/>.
 *
 * In case of any questions, you can contact us at ESET, spol. s r.o., Einsteinova 24, 851 01 Bratislava, Slovakia.
 */

#ifndef _EWAP_TCP_MAP_H_
#define _EWAP_TCP_MAP_H_

#include "ewap_path.h"

#include <linux/rbtree.h>

struct ewap_tcp_key {
  uint32_t port;

  uint64_t saddr_hi;
  uint64_t saddr_lo;

  uint64_t daddr_hi;
  uint64_t daddr_lo;
};

struct ewap_tcp_node {
  struct ewap_tcp_key key;
  struct rb_node node;

  pid_t pid;
  uid_t uid;
  struct ewap_path *path;

  struct ewap_tcp_map *tcp_map;
  struct list_head list;
};

struct ewap_tcp_map {
  struct rb_root connections;
};

struct ewap_tcp_node *ewap_tcp_node_new(struct ewap_tcp_key key, pid_t pid,
                                        uid_t uid);
void ewap_tcp_node_free(struct ewap_tcp_node *node);

int ewap_tcp_node_allocator_init(void);
void ewap_tcp_node_allocator_deinit(void);

void ewap_tcp_map_init(struct ewap_tcp_map *map);
void ewap_tcp_map_deinit(struct ewap_tcp_map *map);

bool ewap_tcp_map_add_pid(struct ewap_tcp_map *map,
                          struct ewap_tcp_node *new_node);

struct ewap_tcp_node *ewap_tcp_map_get_node(struct ewap_tcp_map *map,
                                            const struct ewap_tcp_key *key);

struct ewap_tcp_node *ewap_tcp_map_extract_node(struct ewap_tcp_map *map,
                                                const struct ewap_tcp_key *key);

#endif