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/*
* (C) 2006-2011 by Pablo Neira Ayuso <pablo@netfilter.org>
* (C) 2011 by Vyatta Inc. <http://www.vyatta.com>
*
* 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 "queue.h"
#include "queue_tx.h"
#include "network.h"
#include "log.h"
#include "cache.h"
#include "fds.h"
#include "resync.h"
#include <string.h>
static struct alarm_block alive_alarm;
/* XXX: alive message expiration configurable */
#define ALIVE_INT 1
struct cache_notrack {
struct queue_node qnode;
struct cache_object *obj;
};
static void cache_notrack_add(struct cache_object *obj, void *data)
{
struct cache_notrack *cn = data;
queue_node_init(&cn->qnode, Q_ELEM_OBJ);
cn->obj = obj;
}
static void cache_notrack_del(struct cache_object *obj, void *data)
{
struct cache_notrack *cn = data;
queue_del(&cn->qnode);
}
static struct cache_extra cache_notrack_extra = {
.size = sizeof(struct cache_notrack),
.add = cache_notrack_add,
.destroy = cache_notrack_del
};
static int do_cache_to_tx(void *data1, void *data2)
{
struct cache_object *obj = data2;
struct cache_notrack *cn = cache_get_extra(obj);
if (queue_add(STATE_SYNC(tx_queue), &cn->qnode) > 0)
cache_object_get(obj);
return 0;
}
static int kernel_resync_cb(enum nf_conntrack_msg_type type,
struct nf_conntrack *ct, void *data)
{
struct nethdr *net;
if (ct_filter_conntrack(ct, 1))
return NFCT_CB_CONTINUE;
net = BUILD_NETMSG_FROM_CT(ct, NET_T_STATE_CT_NEW);
multichannel_send(STATE_SYNC(channel), net);
return NFCT_CB_CONTINUE;
}
/* Only used if the internal cache is disabled. */
static void kernel_resync(void)
{
struct nfct_handle *h;
uint32_t family = AF_UNSPEC;
int ret;
h = nfct_open(CONFIG(netlink).subsys_id, 0);
if (h == NULL) {
dlog(LOG_ERR, "can't allocate memory for the internal cache");
return;
}
nfct_callback_register(h, NFCT_T_ALL, kernel_resync_cb, NULL);
ret = nfct_query(h, NFCT_Q_DUMP, &family);
if (ret == -1) {
dlog(LOG_ERR, "can't dump kernel table");
}
nfct_close(h);
}
static int notrack_local(int fd, int type, void *data)
{
int ret = LOCAL_RET_OK;
switch(type) {
case REQUEST_DUMP:
resync_req();
break;
case SEND_BULK:
if (CONFIG(sync).internal_cache_disable)
kernel_resync();
else
resync_send(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)) {
dlog(LOG_NOTICE, "resync requested by other node");
if (CONFIG(sync).internal_cache_disable)
kernel_resync();
else
resync_send(do_cache_to_tx);
return MSG_CTL;
}
if (IS_ALIVE(net))
return MSG_CTL;
return MSG_BAD;
}
static int notrack_recv(const struct nethdr *net)
{
int ret;
unsigned int exp_seq;
nethdr_track_seq(net->seq, &exp_seq);
ret = digest_msg(net);
if (ret != MSG_BAD)
nethdr_track_update_seq(net->seq);
return ret;
}
static int tx_queue_xmit(struct queue_node *n, const void *data2)
{
switch (n->type) {
case Q_ELEM_CTL: {
struct nethdr *net = queue_node_data(n);
if (IS_RESYNC(net))
nethdr_set_ack(net);
else
nethdr_set_ctl(net);
HDR_HOST2NETWORK(net);
multichannel_send(STATE_SYNC(channel), net);
queue_del(n);
queue_object_free((struct queue_object *)n);
break;
}
case Q_ELEM_OBJ: {
struct cache_notrack *cn;
int type;
struct nethdr *net;
cn = (struct cache_notrack *)n;
type = object_status_to_network_type(cn->obj);
net = cn->obj->cache->ops->build_msg(cn->obj, type);
multichannel_send(STATE_SYNC(channel), net);
queue_del(n);
cache_object_put(cn->obj);
break;
}
}
return 0;
}
static void notrack_xmit(void)
{
queue_iterate(STATE_SYNC(tx_queue), NULL, tx_queue_xmit);
add_alarm(&alive_alarm, ALIVE_INT, 0);
}
static void notrack_enqueue(struct cache_object *obj, int query)
{
struct cache_notrack *cn = cache_get_extra(obj);
if (queue_add(STATE_SYNC(tx_queue), &cn->qnode) > 0)
cache_object_get(obj);
}
static void do_alive_alarm(struct alarm_block *a, void *data)
{
tx_queue_add_ctlmsg2(NET_F_ALIVE);
add_alarm(&alive_alarm, ALIVE_INT, 0);
}
static int notrack_init(void)
{
init_alarm(&alive_alarm, NULL, do_alive_alarm);
add_alarm(&alive_alarm, ALIVE_INT, 0);
return 0;
}
struct sync_mode sync_notrack = {
.internal_cache_flags = NO_FEATURES,
.external_cache_flags = NO_FEATURES,
.internal_cache_extra = &cache_notrack_extra,
.init = notrack_init,
.local = notrack_local,
.recv = notrack_recv,
.enqueue = notrack_enqueue,
.xmit = notrack_xmit,
};
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