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/*
* (C) 2008 by Pablo Neira Ayuso <pablo@netfilter.org>
*
* 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., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include "conntrackd.h"
#include "sync.h"
#include "us-conntrack.h"
#include "queue.h"
#include "debug.h"
#include "network.h"
#include "log.h"
#include "cache.h"
#include "event.h"
#include <string.h>
static LIST_HEAD(tx_list);
static unsigned int tx_list_len;
static struct queue *tx_queue;
struct cache_notrack {
struct list_head tx_list;
};
static struct cache_extra cache_notrack_extra = {
.size = sizeof(struct cache_notrack),
};
static void tx_queue_add_ctlmsg(uint32_t flags, uint32_t from, uint32_t to)
{
struct nethdr_ack ack = {
.flags = flags,
.from = from,
.to = to,
};
queue_add(tx_queue, &ack, NETHDR_ACK_SIZ);
write_evfd(STATE_SYNC(evfd));
}
static int notrack_init(void)
{
tx_queue = queue_create(~0U);
if (tx_queue == NULL) {
dlog(LOG_ERR, "cannot create tx queue");
return -1;
}
return 0;
}
static void notrack_kill(void)
{
queue_destroy(tx_queue);
}
static int do_cache_to_tx(void *data1, void *data2)
{
struct us_conntrack *u = data2;
struct cache_notrack *cn = cache_get_extra(STATE_SYNC(internal), u);
/* add to tx list */
list_add_tail(&cn->tx_list, &tx_list);
tx_list_len++;
write_evfd(STATE_SYNC(evfd));
return 0;
}
static int notrack_local(int fd, int type, void *data)
{
int ret = 1;
switch(type) {
case REQUEST_DUMP:
dlog(LOG_NOTICE, "request resync");
tx_queue_add_ctlmsg(NET_F_RESYNC, 0, 0);
break;
case SEND_BULK:
dlog(LOG_NOTICE, "sending bulk update");
cache_iterate(STATE_SYNC(internal), NULL, do_cache_to_tx);
break;
default:
ret = 0;
break;
}
return ret;
}
static int digest_msg(const struct nethdr *net)
{
if (IS_DATA(net))
return MSG_DATA;
if (IS_RESYNC(net)) {
cache_iterate(STATE_SYNC(internal), NULL, do_cache_to_tx);
return MSG_CTL;
}
return MSG_BAD;
}
static int notrack_recv(const struct nethdr *net)
{
int ret;
unsigned int exp_seq;
mcast_track_seq(net->seq, &exp_seq);
ret = digest_msg(net);
if (ret != MSG_BAD)
mcast_track_update_seq(net->seq);
return ret;
}
static int tx_queue_xmit(void *data1, const void *data2)
{
struct nethdr *net = data1;
size_t len = prepare_send_netmsg(STATE_SYNC(mcast_client), net);
mcast_buffered_send_netmsg(STATE_SYNC(mcast_client), net, len);
queue_del(tx_queue, net);
return 0;
}
static int tx_list_xmit(struct list_head *i, struct us_conntrack *u, int type)
{
int ret;
struct nethdr *net = BUILD_NETMSG(u->ct, type);
size_t len = prepare_send_netmsg(STATE_SYNC(mcast_client), net);
list_del_init(i);
tx_list_len--;
ret = mcast_buffered_send_netmsg(STATE_SYNC(mcast_client), net, len);
return ret;
}
static void notrack_run(void)
{
struct cache_notrack *cn, *tmp;
/* send messages in the tx_queue */
queue_iterate(tx_queue, NULL, tx_queue_xmit);
/* send conntracks in the tx_list */
list_for_each_entry_safe(cn, tmp, &tx_list, tx_list) {
struct us_conntrack *u;
u = cache_get_conntrack(STATE_SYNC(internal), cn);
tx_list_xmit(&cn->tx_list, u, NFCT_Q_UPDATE);
}
}
struct sync_mode sync_notrack = {
.internal_cache_flags = LIFETIME,
.external_cache_flags = LIFETIME,
.internal_cache_extra = &cache_notrack_extra,
.init = notrack_init,
.kill = notrack_kill,
.local = notrack_local,
.recv = notrack_recv,
.run = notrack_run,
};
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