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/* libnfqnetlink.c: generic library for access to nf_queue
*
* (C) 2005 by Harald Welte <laforge@gnumonks.org>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2
* as published by the Free Software Foundation
*
* 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
*/
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <ctype.h>
#include <time.h>
#include <errno.h>
#include <netinet/in.h>
#include <sys/socket.h>
#include <linux/netlink.h>
#include <linux/netfilter/nfnetlink.h>
#include <linux/netfilter/nfnetlink_log.h>
#include "libnfnetlink_log.h"
/***********************************************************************
* low level stuff
***********************************************************************/
int nfulnl_open(struct nfulnl_handle *h)
{
int err;
memset(h, 0, sizeof(*h));
err = nfnl_open(&h->nfnlh, NFNL_SUBSYS_ULOG, 0);
if (err < 0)
return err;
return 0;
}
int nfulnl_close(struct nfulnl_handle *h)
{
return nfnl_close(&h->nfnlh);
}
/* build a NFULNL_MSG_CONFIG message */
static int
__build_send_cfg_msg(struct nfulnl_handle *h, u_int8_t command,
u_int16_t queuenum, u_int8_t pf)
{
char buf[NLMSG_LENGTH(sizeof(struct nlmsghdr))
+NLMSG_LENGTH(sizeof(struct nfgenmsg))
+NFA_LENGTH(sizeof(struct nfulnl_msg_config_cmd))];
struct nfulnl_msg_config_cmd cmd;
struct nlmsghdr *nmh = (struct nlmsghdr *) buf;
nfnl_fill_hdr(&h->nfnlh, nmh, 0, pf, queuenum,
NFULNL_MSG_CONFIG, NLM_F_REQUEST|NLM_F_ACK);
cmd.command = command;
nfnl_addattr_l(nmh, sizeof(buf), NFULA_CFG_CMD, &cmd, sizeof(cmd));
return nfnl_send(&h->nfnlh, nmh);
}
/* bind nf_queue from a specific protocol family */
int nfulnl_bind_pf(struct nfulnl_handle *h, u_int16_t pf)
{
return __build_send_cfg_msg(h, NFULNL_CFG_CMD_PF_BIND, 0, pf);
}
/* unbind nf_queue from a specific protocol family */
int nfulnl_unbind_pf(struct nfulnl_handle *h, u_int16_t pf)
{
return __build_send_cfg_msg(h, NFULNL_CFG_CMD_PF_UNBIND, 0, pf);
}
/* bind this socket to a specific queue number */
int nfulnl_bind_group(struct nfulnl_handle *h,
struct nfulnl_g_handle *gh, u_int16_t num)
{
gh->h = h;
gh->id = num;
return __build_send_cfg_msg(h, NFULNL_CFG_CMD_BIND, num, 0);
}
/* unbind this socket from a specific queue number */
int nfulnl_unbind_group(struct nfulnl_g_handle *gh)
{
int ret = __build_send_cfg_msg(gh->h, NFULNL_CFG_CMD_UNBIND, gh->id, 0);
if (ret == 0)
gh->h = NULL;
return ret;
}
int nfulnl_set_mode(struct nfulnl_g_handle *gh,
u_int8_t mode, u_int32_t range)
{
char buf[NLMSG_LENGTH(sizeof(struct nlmsghdr))
+NLMSG_LENGTH(sizeof(struct nfgenmsg))
+NFA_LENGTH(sizeof(struct nfulnl_msg_config_params))];
struct nfulnl_msg_config_params params;
struct nlmsghdr *nmh = (struct nlmsghdr *) buf;
nfnl_fill_hdr(&gh->h->nfnlh, nmh, 0, AF_UNSPEC, gh->id,
NFULNL_MSG_CONFIG, NLM_F_REQUEST|NLM_F_ACK);
params.copy_range = htonl(range);
params.copy_mode = mode;
nfnl_addattr_l(nmh, sizeof(buf), NFULA_CFG_PARAMS, ¶ms,
sizeof(params));
return nfnl_send(&gh->h->nfnlh, nmh);
}
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