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/*
* Copyright (c) 2014 Balabit
* Copyright (c) 2014 Zoltan Fried
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*
* As an additional exemption you are allowed to compile & link against the
* OpenSSL libraries as published by the OpenSSL project. See the file
* COPYING for details.
*
*/
#include "filter-netmask6.h"
#include "gsocket.h"
#include "logmsg/logmsg.h"
#include <stdlib.h>
#include <string.h>
#include <arpa/inet.h>
#include <netinet/in.h>
#if SYSLOG_NG_ENABLE_IPV6
typedef struct _FilterNetmask6
{
FilterExprNode super;
struct in6_addr address;
int prefix;
gboolean is_valid;
} FilterNetmask6;
static inline uint64_t
_calculate_mask_by_prefix(int prefix)
{
return (uint64_t) (~0) << (64 - prefix);
}
static inline uint64_t
_mask(uint64_t base, uint64_t mask)
{
if (G_BYTE_ORDER == G_BIG_ENDIAN)
{
return base & mask;
}
else
{
const uint64_t reversed_base = GUINT64_SWAP_LE_BE(base);
return GUINT64_SWAP_LE_BE(reversed_base & mask);
}
}
void
get_network_address(const struct in6_addr *address, int prefix, struct in6_addr *network)
{
struct ipv6_parts
{
uint64_t lo;
uint64_t hi;
} ipv6_parts;
int length;
memset(network, 0, sizeof(*network));
memcpy(&ipv6_parts, address, sizeof(*address));
if (prefix <= 64)
{
ipv6_parts.lo = _mask(ipv6_parts.lo, _calculate_mask_by_prefix(prefix));
length = sizeof(uint64_t);
}
else
{
ipv6_parts.hi = _mask(ipv6_parts.hi, _calculate_mask_by_prefix(prefix - 64));
length = 2 * sizeof(uint64_t);
}
memcpy(network->s6_addr, &ipv6_parts, length);
}
static inline gboolean
_in6_addr_compare(const struct in6_addr *address1, const struct in6_addr *address2)
{
return memcmp(address1, address2, sizeof(struct in6_addr)) == 0;
}
static gboolean
_eval(FilterExprNode *s, LogMessage **msgs, gint num_msg, LogTemplateEvalOptions *options)
{
FilterNetmask6 *self = (FilterNetmask6 *) s;
LogMessage *msg = msgs[num_msg - 1];
gboolean result = FALSE;
struct in6_addr network_address;
const struct in6_addr *address;
if (!self->is_valid)
return s->comp;
if (msg->saddr && g_sockaddr_inet6_check(msg->saddr))
{
address = &((struct sockaddr_in6 *) &msg->saddr->sa)->sin6_addr;
}
else if (!msg->saddr || msg->saddr->sa.sa_family == AF_UNIX)
{
address = &in6addr_loopback;
}
else
{
address = NULL;
}
if (address)
{
get_network_address(address, self->prefix, &network_address);
result = _in6_addr_compare(&network_address, &self->address);
}
else
result = FALSE;
msg_trace("netmask6() evaluation started",
evt_tag_inaddr6("msg_address", address),
evt_tag_inaddr6("address", &self->address),
evt_tag_int("prefix", self->prefix),
evt_tag_msg_reference(msg));
return result ^ s->comp;
}
FilterExprNode *
filter_netmask6_new(const gchar *cidr)
{
FilterNetmask6 *self = g_new0(FilterNetmask6, 1);
struct in6_addr packet_addr;
gchar address[INET6_ADDRSTRLEN];
gchar *slash = strchr(cidr, '/');
filter_expr_node_init_instance(&self->super);
if (strlen(cidr) >= sizeof(address) || !slash)
{
self->is_valid = inet_pton(AF_INET6, cidr, &packet_addr) == 1;
self->prefix = 128;
}
else
{
self->prefix = strtol(slash + 1, NULL, 10);
if (self->prefix > 0 && self->prefix < 129)
{
strncpy(address, cidr, slash - cidr);
address[slash - cidr] = 0;
self->is_valid = inet_pton(AF_INET6, address, &packet_addr) == 1;
}
}
if (self->is_valid)
get_network_address(&packet_addr, self->prefix, &self->address);
else
self->address = in6addr_loopback;
self->super.eval = _eval;
return &self->super;
}
#endif
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