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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 "jhash.h"
#include "hash.h"
#include "conntrackd.h"
#include <libnetfilter_conntrack/libnetfilter_conntrack.h>
#include <errno.h>
#include "us-conntrack.h"
struct __dump_container {
int fd;
int type;
};
static int do_dump(void *data1, void *data2)
{
char buf[1024];
int size;
struct __dump_container *container = data1;
struct us_conntrack *u = data2;
void *data = u->data;
int i;
memset(buf, 0, sizeof(buf));
size = nfct_snprintf(buf,
sizeof(buf),
u->ct,
NFCT_T_UNKNOWN,
container->type,
0);
for (i = 0; i < u->cache->num_features; i++) {
if (u->cache->features[i]->dump) {
size += u->cache->features[i]->dump(u,
data,
buf+size,
container->type);
data += u->cache->features[i]->size;
}
}
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);
}
/* no need to clone, called from child process */
static int do_commit(void *data1, void *data2)
{
int ret;
u_int8_t flags;
struct cache *c = data1;
struct us_conntrack *u = data2;
struct nf_conntrack *ct = u->ct;
/* XXX: related connections */
if (nfct_attr_is_set(ct, ATTR_STATUS)) {
u_int32_t status = nfct_get_attr_u32(ct, ATTR_STATUS);
status &= ~IPS_EXPECTED;
nfct_set_attr_u32(ct, ATTR_STATUS, status);
}
nfct_setobjopt(ct, NFCT_SOPT_SETUP_REPLY);
/*
* Set a reduced timeout for candidate-to-be-committed
* conntracks that live in the external cache
*/
nfct_set_attr_u32(ct, ATTR_TIMEOUT, CONFIG(commit_timeout));
/*
* TCP flags to overpass window tracking for recovered connections
*/
flags = IP_CT_TCP_FLAG_BE_LIBERAL | IP_CT_TCP_FLAG_SACK_PERM;
nfct_set_attr_u8(ct, ATTR_TCP_FLAGS_ORIG, flags);
nfct_set_attr_u8(ct, ATTR_TCP_MASK_ORIG, flags);
nfct_set_attr_u8(ct, ATTR_TCP_FLAGS_REPL, flags);
nfct_set_attr_u8(ct, ATTR_TCP_MASK_REPL, flags);
ret = nfct_query(STATE(dump), NFCT_Q_CREATE_UPDATE, ct);
if (ret == -1) {
switch(errno) {
case EEXIST:
c->commit_exist++;
break;
default:
c->commit_fail++;
break;
}
} else {
c->commit_ok++;
}
/* keep iterating even if we have found errors */
return 0;
}
void cache_commit(struct cache *c)
{
unsigned int commit_ok = c->commit_ok;
unsigned int commit_exist = c->commit_exist;
unsigned int commit_fail = c->commit_fail;
hashtable_iterate(c->h, c, do_commit);
/* calculate new entries committed */
commit_ok = c->commit_ok - commit_ok;
commit_fail = c->commit_fail - commit_fail;
commit_exist = c->commit_exist - commit_exist;
/* log results */
dlog(STATE(log), "Committed %u new entries", commit_ok);
if (commit_exist)
dlog(STATE(log), "%u entries ignored, "
"already exist", commit_exist);
if (commit_fail)
dlog(STATE(log), "%u entries can't be "
"committed", commit_fail);
}
static int do_flush(void *data1, void *data2)
{
struct cache *c = data1;
struct us_conntrack *u = data2;
cache_del(c, u->ct);
return 0;
}
void cache_flush(struct cache *c)
{
hashtable_iterate(c->h, c, do_flush);
c->flush++;
}
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