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/usr/include/ircd-hybrid-8/ipcache.h is in hybrid-dev 1:8.2.12+dfsg.1-1.

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/*
 *  ircd-hybrid: an advanced, lightweight Internet Relay Chat Daemon (ircd)
 *
 *  Copyright (c) 1997-2016 ircd-hybrid development team
 *
 *  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 2 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, write to the Free Software
 *  Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301
 *  USA
 */

/*! \file ipcache.h
 * \brief Routines to count connections from particular IP addresses.
 * \version $Id: ipcache.h 7007 2016-01-01 00:09:08Z michael $
 */

#ifndef INCLUDED_ipcache_h
#define INCLUDED_ipcache_h
#include "ircd_defs.h"

/*
 * Usually, with hash tables, you use a prime number...
 * but in this case I am dealing with ip addresses,
 * not ascii strings.
 */
enum { IP_HASH_SIZE = 0x1000 };

struct ip_entry
{
  dlink_node node;                /**< Doubly linked list node */
  struct irc_ssaddr ip;           /**< Holds an IPv6 or IPv4 address */
  unsigned int count;             /**< Number of registered users using this IP */
  unsigned int connection_count;  /**< Number of connections from this IP in the last throttle_time duration */
  time_t last_attempt;            /**< The last time someone connected from this IP */
};

extern struct ip_entry *ipcache_find_or_add_address(const struct irc_ssaddr *);
extern void ipcache_remove_address(const struct irc_ssaddr *);
extern void ipcache_get_stats(unsigned int *const, size_t *const);
extern void ipcache_init(void);
#endif