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/*
* (C) 2006-2007 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 "cache.h"
#include "hash.h"
#include "log.h"
#include "conntrackd.h"
#include "netlink.h"
#include <libnetfilter_conntrack/libnetfilter_conntrack.h>
#include <sched.h>
#include <errno.h>
#include <string.h>
#include <time.h>
struct __dump_container {
int fd;
int type;
};
static int do_dump(void *data1, struct hashtable_node *n)
{
char buf[1024];
int size;
struct __dump_container *container = data1;
struct cache_object *obj = (struct cache_object *)n;
char *data = obj->data;
unsigned i;
/*
* XXX: Do not dump the entries that are scheduled to expire.
* These entries talk about already destroyed connections
* that we keep for some time just in case that we have to
* resent some lost messages. We do not show them to the
* user as he may think that the firewall replicas are not
* in sync. The branch below is a hack as it is quite
* specific and it breaks conntrackd modularity. Probably
* there's a nicer way to do this but until I come up with it...
*/
if (CONFIG(flags) & CTD_SYNC_FTFW && obj->status == C_OBJ_DEAD)
return 0;
/* do not show cached timeout, this may confuse users */
if (nfct_attr_is_set(obj->ct, ATTR_TIMEOUT))
nfct_attr_unset(obj->ct, ATTR_TIMEOUT);
memset(buf, 0, sizeof(buf));
size = nfct_snprintf(buf,
sizeof(buf),
obj->ct,
NFCT_T_UNKNOWN,
container->type,
0);
for (i = 0; i < obj->cache->num_features; i++) {
if (obj->cache->features[i]->dump) {
size += obj->cache->features[i]->dump(obj,
data,
buf+size,
container->type);
data += obj->cache->features[i]->size;
}
}
if (container->type != NFCT_O_XML) {
long tm = time(NULL);
size += sprintf(buf+size, " [active since %lds]",
tm - obj->lifetime);
}
size += sprintf(buf+size, "\n");
if (send(container->fd, buf, size, 0) == -1) {
if (errno != EPIPE)
return -1;
}
return 0;
}
void cache_dump(struct cache *c, int fd, int type)
{
struct __dump_container tmp = {
.fd = fd,
.type = type
};
hashtable_iterate(c->h, (void *) &tmp, do_dump);
}
struct __commit_container {
struct nfct_handle *h;
struct cache *c;
};
static void
__do_commit_step(struct __commit_container *tmp, struct cache_object *obj)
{
int ret, retry = 1, timeout;
struct nf_conntrack *ct = obj->ct;
if (CONFIG(commit_timeout)) {
timeout = CONFIG(commit_timeout);
} else {
timeout = time(NULL) - obj->lastupdate;
if (timeout < 0) {
/* XXX: Arbitrarily set the timer to one minute, how
* can this happen? For example, an adjustment due to
* daylight-saving. Probably other situations can
* trigger this. */
timeout = 60;
}
/* calculate an estimation of the current timeout */
timeout = nfct_get_attr_u32(ct, ATTR_TIMEOUT) - timeout;
if (timeout < 0) {
timeout = 60;
}
}
retry:
if (nl_create_conntrack(tmp->h, ct, timeout) == -1) {
if (errno == EEXIST && retry == 1) {
ret = nl_destroy_conntrack(tmp->h, ct);
if (ret == 0 || (ret == -1 && errno == ENOENT)) {
if (retry) {
retry = 0;
goto retry;
}
}
dlog(LOG_ERR, "commit-destroy: %s", strerror(errno));
dlog_ct(STATE(log), ct, NFCT_O_PLAIN);
tmp->c->stats.commit_fail++;
} else {
dlog(LOG_ERR, "commit-create: %s", strerror(errno));
dlog_ct(STATE(log), ct, NFCT_O_PLAIN);
tmp->c->stats.commit_fail++;
}
} else {
tmp->c->stats.commit_ok++;
}
}
static int do_commit_related(void *data, struct hashtable_node *n)
{
struct cache_object *obj = (struct cache_object *)n;
if (ct_is_related(obj->ct))
__do_commit_step(data, obj);
/* keep iterating even if we have found errors */
return 0;
}
static int do_commit_master(void *data, struct hashtable_node *n)
{
struct cache_object *obj = (struct cache_object *)n;
if (ct_is_related(obj->ct))
return 0;
__do_commit_step(data, obj);
return 0;
}
/* no need to clone, called from child process */
void cache_commit(struct cache *c)
{
unsigned int commit_ok = c->stats.commit_ok;
unsigned int commit_fail = c->stats.commit_fail;
struct __commit_container tmp;
struct timeval commit_start, commit_stop, res;
tmp.h = nfct_open(CONNTRACK, 0);
if (tmp.h == NULL) {
dlog(LOG_ERR, "can't create handler to commit entries");
return;
}
tmp.c = c;
gettimeofday(&commit_start, NULL);
/* commit master conntrack first, then related ones */
hashtable_iterate(c->h, &tmp, do_commit_master);
hashtable_iterate(c->h, &tmp, do_commit_related);
gettimeofday(&commit_stop, NULL);
timersub(&commit_stop, &commit_start, &res);
/* calculate new entries committed */
commit_ok = c->stats.commit_ok - commit_ok;
commit_fail = c->stats.commit_fail - commit_fail;
/* log results */
dlog(LOG_NOTICE, "Committed %u new entries", commit_ok);
if (commit_fail)
dlog(LOG_NOTICE, "%u entries can't be "
"committed", commit_fail);
nfct_close(tmp.h);
dlog(LOG_NOTICE, "commit has taken %lu.%06lu seconds",
res.tv_sec, res.tv_usec);
}
static int do_flush(void *data, struct hashtable_node *n)
{
struct cache *c = data;
struct cache_object *obj = (struct cache_object *)n;
cache_del(c, obj);
cache_object_free(obj);
return 0;
}
void cache_flush(struct cache *c)
{
hashtable_iterate(c->h, c, do_flush);
c->stats.flush++;
}
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