trunk/src/conf_class.c

/*
 *  ircd-hybrid: an advanced Internet Relay Chat Daemon(ircd).
 *
 *  Copyright (C) 2002 by the past and present ircd coders, and others.
 *
 *  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., 59 Temple Place, Suite 330, Boston, MA  02111-1307
 *  USA
 */

/*! \file
 * \brief Configuration managment for class{} blocks
 * \version $Id: conf_class.c,v 1.54 2007/10/21 21:57:05 devil Exp $
 */

#include "stdinc.h"
#include "list.h"
#include "ircd_defs.h"
#include "balloc.h"
#include "conf.h"
#include "s_serv.h"
#include "resv.h"
#include "channel.h"
#include "client.h"
#include "event.h"
#include "hook.h"
#include "irc_string.h"
#include "s_bsd.h"
#include "ircd.h"
#include "listener.h"
#include "hostmask.h"
#include "modules.h"
#include "numeric.h"
#include "fdlist.h"
#include "log.h"
#include "send.h"
#include "s_gline.h"
#include "memory.h"
#include "irc_res.h"
#include "userhost.h"
#include "s_user.h"
#include "channel_mode.h"
#include "parse.h"
#include "s_misc.h"
#include "conf_db.h"


struct ClassItem *class_default;

static dlink_list class_list = { NULL, NULL, 0 };


const dlink_list *
class_get_list(void)
{
  return &class_list;
}

struct ClassItem *
class_make(void)
{
  struct ClassItem *class = MyMalloc(sizeof(*class));

  dlinkAdd(class, &class->node, &class_list);

  return class;
}

void
class_free(struct ClassItem *class)
{
  assert(class);
  assert(class->active    == 0);
  assert(class->ref_count == 0);

  dlinkDelete(&class->node, &class_list);
  MyFree(class->name);
  MyFree(class);
}

void
class_init(void)
{
  class_default = class_make();

  class_default->active = 1;
  DupString(class_default->name, "default");
  class_default->con_freq  = DEFAULT_CONNECTFREQUENCY;
  class_default->ping_freq = DEFAULT_PINGFREQUENCY;
  class_default->max_total = MAXIMUM_LINKS_DEFAULT;
  class_default->max_sendq = DEFAULT_SENDQ;
  class_default->max_recvq = DEFAULT_RECVQ;

  client_check_cb = register_callback("check_client", check_client);
}

const char *
get_client_class(const dlink_list *const list)
{
  const dlink_node *ptr = NULL;

  if ((ptr = list->head)) {
    const struct MaskItem *conf = ptr->data;

    assert(conf->class);
    assert(conf->type & (CONF_OPERATOR | CONF_CLIENT | CONF_SERVER));

    return conf->class->name;
  }

  return class_default->name;
}

unsigned int
get_client_ping(const dlink_list *const list, int *pingwarn)
{
  const dlink_node *ptr = NULL;
  int ping = 0;

  if ((ptr = list->head)) {
    const struct MaskItem *conf = ptr->data;

    assert(aconf->class);
    assert(aconf->type & (CONF_OPERATOR | CONF_CLIENT | CONF_SERVER));

    ping = get_conf_ping(conf, pingwarn);
    if (ping > 0)
      return ping;
  }

  return class_default->ping_freq;
}

unsigned int
get_sendq(const dlink_list *const list)
{
  const dlink_node *ptr = NULL;

  if ((ptr = list->head)) {
    const struct MaskItem *conf = ptr->data;

    assert(conf->class);
    assert(conf->type & (CONF_OPERATOR | CONF_CLIENT | CONF_SERVER));

    return conf->class->max_sendq;
  }

  return class_default->max_sendq;
}

unsigned int
get_recvq(const dlink_list *const list)
{
  const dlink_node *ptr = NULL;

  if ((ptr = list->head)) {
    const struct MaskItem *conf = ptr->data;

    assert(conf->class);
    assert(conf->type & (CONF_OPERATOR | CONF_CLIENT | CONF_SERVER));

    return conf->class->max_recvq;
  }

  return class_default->max_recvq;
}

/*
 * inputs       - Integer (Number of class)
 * output       - Pointer to ClassItem struct. Non-NULL expected
 * side effects - NONE
 */
struct ClassItem *
class_find(const char *name, int active)
{
  dlink_node *ptr = NULL;

  DLINK_FOREACH(ptr, class_list.head) {
    struct ClassItem *class = ptr->data;

    if (!irccmp(class->name, name))
      return active && !class->active ? NULL : class;
  }

  return NULL;
}

/*
 * We don't delete the class table, rather mark all entries for deletion.
 * The table is cleaned up by delete_marked_classes. - avalon
 */
void
class_mark_for_deletion(void)
{
  dlink_node *ptr = NULL;

  DLINK_FOREACH(ptr, class_list.head)
  {
    struct ClassItem *class = ptr->data;

    if (class != class_default)
      class->active = 0;
  }
}

void
class_delete_marked(void)
{
  dlink_node *ptr = NULL, *ptr_next = NULL;

  DLINK_FOREACH_SAFE(ptr, ptr_next, class_list.head) {
    struct ClassItem *class = ptr->data;

    if (!class->active && !class->ref_count)
    {
      destroy_cidr_class(class);
      class_free(class);
    }
  }
}

/*
 * cidr_limit_reached
 *
 * inputs       - int flag allowing over_rule of limits
 *              - pointer to the ip to be added
 *              - pointer to the class
 * output       - non zero if limit reached
 *                0 if limit not reached
 * side effects -
 */
int
cidr_limit_reached(int over_rule,
                   struct irc_ssaddr *ip, struct ClassItem *class)
{
  dlink_node *ptr = NULL;
  struct CidrItem *cidr = NULL;

  if (class->number_per_cidr <= 0)
    return 0;

  if (ip->ss.ss_family == AF_INET)
  {
    if (class->cidr_bitlen_ipv4 <= 0)
      return 0;

    DLINK_FOREACH(ptr, class->list_ipv4.head)
    {
      cidr = ptr->data;
      if (match_ipv4(ip, &cidr->mask, class->cidr_bitlen_ipv4))
      {
        if (!over_rule && (cidr->number_on_this_cidr >= class->number_per_cidr))
          return -1;
        cidr->number_on_this_cidr++;
        return 0;
      }
    }
    cidr = MyMalloc(sizeof(struct CidrItem));
    cidr->number_on_this_cidr = 1;
    cidr->mask = *ip;
    mask_addr(&cidr->mask, class->cidr_bitlen_ipv4);
    dlinkAdd(cidr, &cidr->node, &class->list_ipv4);
  }
#ifdef IPV6
  else if (class->cidr_bitlen_ipv6 > 0)
  {
    DLINK_FOREACH(ptr, class->list_ipv6.head)
    {
      cidr = ptr->data;
      if (match_ipv6(ip, &cidr->mask, class->cidr_bitlen_ipv6))
      {
        if (!over_rule && (cidr->number_on_this_cidr >= class->number_per_cidr))
          return -1;
        cidr->number_on_this_cidr++;
        return 0;
      }
    }
    cidr = MyMalloc(sizeof(struct CidrItem));
    cidr->number_on_this_cidr = 1;
    cidr->mask = *ip;
    mask_addr(&cidr->mask, class->cidr_bitlen_ipv6);
    dlinkAdd(cidr, &cidr->node, &class->list_ipv6);
  }
#endif
  return 0;
}

/*
 * remove_from_cidr_check
 *
 * inputs       - pointer to the ip to be removed
 *              - pointer to the class
 * output       - NONE
 * side effects -
 */
void
remove_from_cidr_check(struct irc_ssaddr *ip, struct ClassItem *aclass)
{
  dlink_node *ptr = NULL;
  dlink_node *next_ptr = NULL;
  struct CidrItem *cidr;

  if (aclass->number_per_cidr == 0)
    return;

  if (ip->ss.ss_family == AF_INET)
  {
    if (aclass->cidr_bitlen_ipv4 <= 0)
      return;

    DLINK_FOREACH_SAFE(ptr, next_ptr, aclass->list_ipv4.head)
    {
      cidr = ptr->data;
      if (match_ipv4(ip, &cidr->mask, aclass->cidr_bitlen_ipv4))
      {
        cidr->number_on_this_cidr--;
        if (cidr->number_on_this_cidr == 0)
        {
          dlinkDelete(ptr, &aclass->list_ipv4);
          MyFree(cidr);
          return;
        }
      }
    }
  }
#ifdef IPV6
  else if (aclass->cidr_bitlen_ipv6 > 0)
  {
    DLINK_FOREACH_SAFE(ptr, next_ptr, aclass->list_ipv6.head)
    {
      cidr = ptr->data;
      if (match_ipv6(ip, &cidr->mask, aclass->cidr_bitlen_ipv6))
      {
        cidr->number_on_this_cidr--;
        if (cidr->number_on_this_cidr == 0)
        {
          dlinkDelete(ptr, &aclass->list_ipv6);
          MyFree(cidr);
          return;
        }
      }
    }
  }
#endif
}

static void
rebuild_cidr_list(int aftype, struct ClassItem *oldcl, struct ClassItem *newcl,
                  dlink_list *old_list, dlink_list *new_list, int changed)
{
  dlink_node *ptr;
  struct Client *client_p;
  struct MaskItem *conf;

  if (!changed)
  {
    *new_list = *old_list;
    old_list->head = old_list->tail = NULL;
    old_list->length = 0;
    return;
  }

  DLINK_FOREACH(ptr, local_client_list.head)
  {
    client_p = ptr->data;
    if (client_p->localClient->aftype != aftype)
      continue;
    if (dlink_list_length(&client_p->localClient->confs) == 0)
      continue;

    conf = client_p->localClient->confs.tail->data;
    if (conf->type == CONF_CLIENT)
      if (conf->class == oldcl)
        cidr_limit_reached(1, &client_p->localClient->ip, newcl);
  }
}

/*
 * rebuild_cidr_class
 *
 * inputs       - pointer to old conf
 *              - pointer to new_class
 * output       - none
 * side effects - rebuilds the class link list of cidr blocks
 */
void
rebuild_cidr_class(struct ClassItem *old_class, struct ClassItem *new_class)
{
  if (old_class->number_per_cidr > 0 && new_class->number_per_cidr > 0)
  {
    if (old_class->cidr_bitlen_ipv4 > 0 && new_class->cidr_bitlen_ipv4 > 0)
      rebuild_cidr_list(AF_INET, old_class, new_class,
                        &old_class->list_ipv4, &new_class->list_ipv4,
                        old_class->cidr_bitlen_ipv4 != new_class->cidr_bitlen_ipv4);

#ifdef IPV6
    if (old_class->cidr_bitlen_ipv6 > 0 && new_class->cidr_bitlen_ipv6 > 0)
      rebuild_cidr_list(AF_INET6, old_class, new_class,
                        &old_class->list_ipv6, &new_class->list_ipv6,
                        old_class->cidr_bitlen_ipv6 != new_class->cidr_bitlen_ipv6);
#endif
  }

  destroy_cidr_class(old_class);
}

/*
 * destroy_cidr_list
 *
 * inputs       - pointer to class dlink list of cidr blocks
 * output       - none
 * side effects - completely destroys the class link list of cidr blocks
 */
static void
destroy_cidr_list(dlink_list *list)
{
  dlink_node *ptr = NULL, *next_ptr = NULL;

  DLINK_FOREACH_SAFE(ptr, next_ptr, list->head)
  {
    dlinkDelete(ptr, list);
    MyFree(ptr->data);
  }
}

/*
 * destroy_cidr_class
 *
 * inputs       - pointer to class
 * output       - none
 * side effects - completely destroys the class link list of cidr blocks
 */
void
destroy_cidr_class(struct ClassItem *class)
{
  destroy_cidr_list(&class->list_ipv4);
  destroy_cidr_list(&class->list_ipv6);
}
Revision:	1633
Committed:	Sun Nov 4 15:51:30 2012 UTC (13 years, 8 months ago) by michael
Content type:	text/x-csrc
File size:	10341 byte(s)
Log Message:	- Add conf_class.c, conf_class.h
#	Content
1	/*
2	* ircd-hybrid: an advanced Internet Relay Chat Daemon(ircd).
3	*
4	* Copyright (C) 2002 by the past and present ircd coders, and others.
5	*
6	* This program is free software; you can redistribute it and/or modify
7	* it under the terms of the GNU General Public License as published by
8	* the Free Software Foundation; either version 2 of the License, or
9	* (at your option) any later version.
10	*
11	* This program is distributed in the hope that it will be useful,
12	* but WITHOUT ANY WARRANTY; without even the implied warranty of
13	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14	* GNU General Public License for more details.
15	*
16	* You should have received a copy of the GNU General Public License
17	* along with this program; if not, write to the Free Software
18	* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
19	* USA
20	*/
21
22	/*! \file
23	* \brief Configuration managment for class{} blocks
24	* \version $Id: conf_class.c,v 1.54 2007/10/21 21:57:05 devil Exp $
25	*/
26
27	#include "stdinc.h"
28	#include "list.h"
29	#include "ircd_defs.h"
30	#include "balloc.h"
31	#include "conf.h"
32	#include "s_serv.h"
33	#include "resv.h"
34	#include "channel.h"
35	#include "client.h"
36	#include "event.h"
37	#include "hook.h"
38	#include "irc_string.h"
39	#include "s_bsd.h"
40	#include "ircd.h"
41	#include "listener.h"
42	#include "hostmask.h"
43	#include "modules.h"
44	#include "numeric.h"
45	#include "fdlist.h"
46	#include "log.h"
47	#include "send.h"
48	#include "s_gline.h"
49	#include "memory.h"
50	#include "irc_res.h"
51	#include "userhost.h"
52	#include "s_user.h"
53	#include "channel_mode.h"
54	#include "parse.h"
55	#include "s_misc.h"
56	#include "conf_db.h"
57
58
59	struct ClassItem *class_default;
60
61	static dlink_list class_list = { NULL, NULL, 0 };
62
63
64	const dlink_list *
65	class_get_list(void)
66	{
67	return &class_list;
68	}
69
70	struct ClassItem *
71	class_make(void)
72	{
73	struct ClassItem class = MyMalloc(sizeof(class));
74
75	dlinkAdd(class, &class->node, &class_list);
76
77	return class;
78	}
79
80	void
81	class_free(struct ClassItem *class)
82	{
83	assert(class);
84	assert(class->active == 0);
85	assert(class->ref_count == 0);
86
87	dlinkDelete(&class->node, &class_list);
88	MyFree(class->name);
89	MyFree(class);
90	}
91
92	void
93	class_init(void)
94	{
95	class_default = class_make();
96
97	class_default->active = 1;
98	DupString(class_default->name, "default");
99	class_default->con_freq = DEFAULT_CONNECTFREQUENCY;
100	class_default->ping_freq = DEFAULT_PINGFREQUENCY;
101	class_default->max_total = MAXIMUM_LINKS_DEFAULT;
102	class_default->max_sendq = DEFAULT_SENDQ;
103	class_default->max_recvq = DEFAULT_RECVQ;
104
105	client_check_cb = register_callback("check_client", check_client);
106	}
107
108	const char *
109	get_client_class(const dlink_list *const list)
110	{
111	const dlink_node *ptr = NULL;
112
113	if ((ptr = list->head)) {
114	const struct MaskItem *conf = ptr->data;
115
116	assert(conf->class);
117	assert(conf->type & (CONF_OPERATOR \| CONF_CLIENT \| CONF_SERVER));
118
119	return conf->class->name;
120	}
121
122	return class_default->name;
123	}
124
125	unsigned int
126	get_client_ping(const dlink_list const list, int pingwarn)
127	{
128	const dlink_node *ptr = NULL;
129	int ping = 0;
130
131	if ((ptr = list->head)) {
132	const struct MaskItem *conf = ptr->data;
133
134	assert(aconf->class);
135	assert(aconf->type & (CONF_OPERATOR \| CONF_CLIENT \| CONF_SERVER));
136
137	ping = get_conf_ping(conf, pingwarn);
138	if (ping > 0)
139	return ping;
140	}
141
142	return class_default->ping_freq;
143	}
144
145	unsigned int
146	get_sendq(const dlink_list *const list)
147	{
148	const dlink_node *ptr = NULL;
149
150	if ((ptr = list->head)) {
151	const struct MaskItem *conf = ptr->data;
152
153	assert(conf->class);
154	assert(conf->type & (CONF_OPERATOR \| CONF_CLIENT \| CONF_SERVER));
155
156	return conf->class->max_sendq;
157	}
158
159	return class_default->max_sendq;
160	}
161
162	unsigned int
163	get_recvq(const dlink_list *const list)
164	{
165	const dlink_node *ptr = NULL;
166
167	if ((ptr = list->head)) {
168	const struct MaskItem *conf = ptr->data;
169
170	assert(conf->class);
171	assert(conf->type & (CONF_OPERATOR \| CONF_CLIENT \| CONF_SERVER));
172
173	return conf->class->max_recvq;
174	}
175
176	return class_default->max_recvq;
177	}
178
179	/*
180	* inputs - Integer (Number of class)
181	* output - Pointer to ClassItem struct. Non-NULL expected
182	* side effects - NONE
183	*/
184	struct ClassItem *
185	class_find(const char *name, int active)
186	{
187	dlink_node *ptr = NULL;
188
189	DLINK_FOREACH(ptr, class_list.head) {
190	struct ClassItem *class = ptr->data;
191
192	if (!irccmp(class->name, name))
193	return active && !class->active ? NULL : class;
194	}
195
196	return NULL;
197	}
198
199	/*
200	* We don't delete the class table, rather mark all entries for deletion.
201	* The table is cleaned up by delete_marked_classes. - avalon
202	*/
203	void
204	class_mark_for_deletion(void)
205	{
206	dlink_node *ptr = NULL;
207
208	DLINK_FOREACH(ptr, class_list.head)
209	{
210	struct ClassItem *class = ptr->data;
211
212	if (class != class_default)
213	class->active = 0;
214	}
215	}
216
217	void
218	class_delete_marked(void)
219	{
220	dlink_node ptr = NULL, ptr_next = NULL;
221
222	DLINK_FOREACH_SAFE(ptr, ptr_next, class_list.head) {
223	struct ClassItem *class = ptr->data;
224
225	if (!class->active && !class->ref_count)
226	{
227	destroy_cidr_class(class);
228	class_free(class);
229	}
230	}
231	}
232
233	/*
234	* cidr_limit_reached
235	*
236	* inputs - int flag allowing over_rule of limits
237	* - pointer to the ip to be added
238	* - pointer to the class
239	* output - non zero if limit reached
240	* 0 if limit not reached
241	* side effects -
242	*/
243	int
244	cidr_limit_reached(int over_rule,
245	struct irc_ssaddr ip, struct ClassItem class)
246	{
247	dlink_node *ptr = NULL;
248	struct CidrItem *cidr = NULL;
249
250	if (class->number_per_cidr <= 0)
251	return 0;
252
253	if (ip->ss.ss_family == AF_INET)
254	{
255	if (class->cidr_bitlen_ipv4 <= 0)
256	return 0;
257
258	DLINK_FOREACH(ptr, class->list_ipv4.head)
259	{
260	cidr = ptr->data;
261	if (match_ipv4(ip, &cidr->mask, class->cidr_bitlen_ipv4))
262	{
263	if (!over_rule && (cidr->number_on_this_cidr >= class->number_per_cidr))
264	return -1;
265	cidr->number_on_this_cidr++;
266	return 0;
267	}
268	}
269	cidr = MyMalloc(sizeof(struct CidrItem));
270	cidr->number_on_this_cidr = 1;
271	cidr->mask = *ip;
272	mask_addr(&cidr->mask, class->cidr_bitlen_ipv4);
273	dlinkAdd(cidr, &cidr->node, &class->list_ipv4);
274	}
275	#ifdef IPV6
276	else if (class->cidr_bitlen_ipv6 > 0)
277	{
278	DLINK_FOREACH(ptr, class->list_ipv6.head)
279	{
280	cidr = ptr->data;
281	if (match_ipv6(ip, &cidr->mask, class->cidr_bitlen_ipv6))
282	{
283	if (!over_rule && (cidr->number_on_this_cidr >= class->number_per_cidr))
284	return -1;
285	cidr->number_on_this_cidr++;
286	return 0;
287	}
288	}
289	cidr = MyMalloc(sizeof(struct CidrItem));
290	cidr->number_on_this_cidr = 1;
291	cidr->mask = *ip;
292	mask_addr(&cidr->mask, class->cidr_bitlen_ipv6);
293	dlinkAdd(cidr, &cidr->node, &class->list_ipv6);
294	}
295	#endif
296	return 0;
297	}
298
299	/*
300	* remove_from_cidr_check
301	*
302	* inputs - pointer to the ip to be removed
303	* - pointer to the class
304	* output - NONE
305	* side effects -
306	*/
307	void
308	remove_from_cidr_check(struct irc_ssaddr ip, struct ClassItem aclass)
309	{
310	dlink_node *ptr = NULL;
311	dlink_node *next_ptr = NULL;
312	struct CidrItem *cidr;
313
314	if (aclass->number_per_cidr == 0)
315	return;
316
317	if (ip->ss.ss_family == AF_INET)
318	{
319	if (aclass->cidr_bitlen_ipv4 <= 0)
320	return;
321
322	DLINK_FOREACH_SAFE(ptr, next_ptr, aclass->list_ipv4.head)
323	{
324	cidr = ptr->data;
325	if (match_ipv4(ip, &cidr->mask, aclass->cidr_bitlen_ipv4))
326	{
327	cidr->number_on_this_cidr--;
328	if (cidr->number_on_this_cidr == 0)
329	{
330	dlinkDelete(ptr, &aclass->list_ipv4);
331	MyFree(cidr);
332	return;
333	}
334	}
335	}
336	}
337	#ifdef IPV6
338	else if (aclass->cidr_bitlen_ipv6 > 0)
339	{
340	DLINK_FOREACH_SAFE(ptr, next_ptr, aclass->list_ipv6.head)
341	{
342	cidr = ptr->data;
343	if (match_ipv6(ip, &cidr->mask, aclass->cidr_bitlen_ipv6))
344	{
345	cidr->number_on_this_cidr--;
346	if (cidr->number_on_this_cidr == 0)
347	{
348	dlinkDelete(ptr, &aclass->list_ipv6);
349	MyFree(cidr);
350	return;
351	}
352	}
353	}
354	}
355	#endif
356	}
357
358	static void
359	rebuild_cidr_list(int aftype, struct ClassItem oldcl, struct ClassItem newcl,
360	dlink_list old_list, dlink_list new_list, int changed)
361	{
362	dlink_node *ptr;
363	struct Client *client_p;
364	struct MaskItem *conf;
365
366	if (!changed)
367	{
368	new_list = old_list;
369	old_list->head = old_list->tail = NULL;
370	old_list->length = 0;
371	return;
372	}
373
374	DLINK_FOREACH(ptr, local_client_list.head)
375	{
376	client_p = ptr->data;
377	if (client_p->localClient->aftype != aftype)
378	continue;
379	if (dlink_list_length(&client_p->localClient->confs) == 0)
380	continue;
381
382	conf = client_p->localClient->confs.tail->data;
383	if (conf->type == CONF_CLIENT)
384	if (conf->class == oldcl)
385	cidr_limit_reached(1, &client_p->localClient->ip, newcl);
386	}
387	}
388
389	/*
390	* rebuild_cidr_class
391	*
392	* inputs - pointer to old conf
393	* - pointer to new_class
394	* output - none
395	* side effects - rebuilds the class link list of cidr blocks
396	*/
397	void
398	rebuild_cidr_class(struct ClassItem old_class, struct ClassItem new_class)
399	{
400	if (old_class->number_per_cidr > 0 && new_class->number_per_cidr > 0)
401	{
402	if (old_class->cidr_bitlen_ipv4 > 0 && new_class->cidr_bitlen_ipv4 > 0)
403	rebuild_cidr_list(AF_INET, old_class, new_class,
404	&old_class->list_ipv4, &new_class->list_ipv4,
405	old_class->cidr_bitlen_ipv4 != new_class->cidr_bitlen_ipv4);
406
407	#ifdef IPV6
408	if (old_class->cidr_bitlen_ipv6 > 0 && new_class->cidr_bitlen_ipv6 > 0)
409	rebuild_cidr_list(AF_INET6, old_class, new_class,
410	&old_class->list_ipv6, &new_class->list_ipv6,
411	old_class->cidr_bitlen_ipv6 != new_class->cidr_bitlen_ipv6);
412	#endif
413	}
414
415	destroy_cidr_class(old_class);
416	}
417
418	/*
419	* destroy_cidr_list
420	*
421	* inputs - pointer to class dlink list of cidr blocks
422	* output - none
423	* side effects - completely destroys the class link list of cidr blocks
424	*/
425	static void
426	destroy_cidr_list(dlink_list *list)
427	{
428	dlink_node ptr = NULL, next_ptr = NULL;
429
430	DLINK_FOREACH_SAFE(ptr, next_ptr, list->head)
431	{
432	dlinkDelete(ptr, list);
433	MyFree(ptr->data);
434	}
435	}
436
437	/*
438	* destroy_cidr_class
439	*
440	* inputs - pointer to class
441	* output - none
442	* side effects - completely destroys the class link list of cidr blocks
443	*/
444	void
445	destroy_cidr_class(struct ClassItem *class)
446	{
447	destroy_cidr_list(&class->list_ipv4);
448	destroy_cidr_list(&class->list_ipv6);
449	}