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/*
* Copyright (C) 2007-2009, 2013 Internet Systems Consortium, Inc. ("ISC")
*
* Permission to use, copy, modify, and/or distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES WITH
* REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
* AND FITNESS. IN NO EVENT SHALL ISC BE LIABLE FOR ANY SPECIAL, DIRECT,
* INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
* LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE
* OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
* PERFORMANCE OF THIS SOFTWARE.
*/
/* $Id: iptable.c,v 1.15 2009/02/18 23:47:48 tbox Exp $ */
#include <config.h>
#include <isc/mem.h>
#include <isc/radix.h>
#include <dns/acl.h>
static void destroy_iptable(dns_iptable_t *dtab);
/*
* Create a new IP table and the underlying radix structure
*/
isc_result_t
dns_iptable_create(isc_mem_t *mctx, dns_iptable_t **target) {
isc_result_t result;
dns_iptable_t *tab;
tab = isc_mem_get(mctx, sizeof(*tab));
if (tab == NULL)
return (ISC_R_NOMEMORY);
tab->mctx = NULL;
isc_mem_attach(mctx, &tab->mctx);
isc_refcount_init(&tab->refcount, 1);
tab->radix = NULL;
tab->magic = DNS_IPTABLE_MAGIC;
result = isc_radix_create(mctx, &tab->radix, RADIX_MAXBITS);
if (result != ISC_R_SUCCESS)
goto cleanup;
*target = tab;
return (ISC_R_SUCCESS);
cleanup:
dns_iptable_detach(&tab);
return (result);
}
isc_boolean_t dns_iptable_neg = ISC_FALSE;
isc_boolean_t dns_iptable_pos = ISC_TRUE;
/*
* Add an IP prefix to an existing IP table
*/
isc_result_t
dns_iptable_addprefix(dns_iptable_t *tab, isc_netaddr_t *addr,
isc_uint16_t bitlen, isc_boolean_t pos)
{
isc_result_t result;
isc_prefix_t pfx;
isc_radix_node_t *node = NULL;
int family;
INSIST(DNS_IPTABLE_VALID(tab));
INSIST(tab->radix);
NETADDR_TO_PREFIX_T(addr, pfx, bitlen);
result = isc_radix_insert(tab->radix, &node, NULL, &pfx);
if (result != ISC_R_SUCCESS) {
isc_refcount_destroy(&pfx.refcount);
return(result);
}
/* If a node already contains data, don't overwrite it */
family = pfx.family;
if (family == AF_UNSPEC) {
/* "any" or "none" */
INSIST(pfx.bitlen == 0);
if (pos) {
if (node->data[0] == NULL)
node->data[0] = &dns_iptable_pos;
if (node->data[1] == NULL)
node->data[1] = &dns_iptable_pos;
} else {
if (node->data[0] == NULL)
node->data[0] = &dns_iptable_neg;
if (node->data[1] == NULL)
node->data[1] = &dns_iptable_neg;
}
} else {
/* any other prefix */
if (node->data[ISC_IS6(family)] == NULL) {
if (pos)
node->data[ISC_IS6(family)] = &dns_iptable_pos;
else
node->data[ISC_IS6(family)] = &dns_iptable_neg;
}
}
isc_refcount_destroy(&pfx.refcount);
return (ISC_R_SUCCESS);
}
/*
* Merge one IP table into another one.
*/
isc_result_t
dns_iptable_merge(dns_iptable_t *tab, dns_iptable_t *source, isc_boolean_t pos)
{
isc_result_t result;
isc_radix_node_t *node, *new_node;
int max_node = 0;
RADIX_WALK (source->radix->head, node) {
new_node = NULL;
result = isc_radix_insert (tab->radix, &new_node, node, NULL);
if (result != ISC_R_SUCCESS)
return(result);
/*
* If we're negating a nested ACL, then we should
* reverse the sense of every node. However, this
* could lead to a negative node in a nested ACL
* becoming a positive match in the parent, which
* could be a security risk. To prevent this, we
* just leave the negative nodes negative.
*/
if (!pos) {
if (node->data[0] &&
*(isc_boolean_t *) node->data[0] == ISC_TRUE)
new_node->data[0] = &dns_iptable_neg;
if (node->data[1] &&
*(isc_boolean_t *) node->data[1] == ISC_TRUE)
new_node->data[1] = &dns_iptable_neg;
}
if (node->node_num[0] > max_node)
max_node = node->node_num[0];
if (node->node_num[1] > max_node)
max_node = node->node_num[1];
} RADIX_WALK_END;
tab->radix->num_added_node += max_node;
return (ISC_R_SUCCESS);
}
void
dns_iptable_attach(dns_iptable_t *source, dns_iptable_t **target) {
REQUIRE(DNS_IPTABLE_VALID(source));
isc_refcount_increment(&source->refcount, NULL);
*target = source;
}
void
dns_iptable_detach(dns_iptable_t **tabp) {
dns_iptable_t *tab = *tabp;
unsigned int refs;
REQUIRE(DNS_IPTABLE_VALID(tab));
isc_refcount_decrement(&tab->refcount, &refs);
if (refs == 0)
destroy_iptable(tab);
*tabp = NULL;
}
static void
destroy_iptable(dns_iptable_t *dtab) {
REQUIRE(DNS_IPTABLE_VALID(dtab));
if (dtab->radix != NULL) {
isc_radix_destroy(dtab->radix, NULL);
dtab->radix = NULL;
}
isc_refcount_destroy(&dtab->refcount);
dtab->magic = 0;
isc_mem_putanddetach(&dtab->mctx, dtab, sizeof(*dtab));
}
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