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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 "conntrackd.h"
#include "network.h"
#include "log.h"
#include <stdlib.h>
#include <time.h>
#include <string.h>
#define NETHDR_ALIGNTO 4
static unsigned int seq_set, cur_seq;
int nethdr_align(int value)
{
return (value + NETHDR_ALIGNTO - 1) & ~(NETHDR_ALIGNTO - 1);
}
int nethdr_size(int len)
{
return NETHDR_SIZ + len;
}
static inline void __nethdr_set(struct nethdr *net, int len)
{
if (!seq_set) {
seq_set = 1;
cur_seq = time(NULL);
}
net->version = CONNTRACKD_PROTOCOL_VERSION;
net->len = len;
net->seq = cur_seq++;
}
void nethdr_set(struct nethdr *net, int type)
{
__nethdr_set(net, NETHDR_SIZ);
net->type = type;
}
void nethdr_set_ack(struct nethdr *net)
{
__nethdr_set(net, NETHDR_ACK_SIZ);
}
void nethdr_set_ctl(struct nethdr *net)
{
__nethdr_set(net, NETHDR_SIZ);
}
static int local_seq_set = 0;
/* this function only tracks, it does not update the last sequence received */
int nethdr_track_seq(uint32_t seq, uint32_t *exp_seq)
{
int ret = SEQ_UNKNOWN;
/* netlink sequence tracking initialization */
if (!local_seq_set) {
ret = SEQ_UNSET;
goto out;
}
/* fast path: we received the correct sequence */
if (seq == STATE_SYNC(last_seq_recv)+1) {
ret = SEQ_IN_SYNC;
goto out;
}
/* out of sequence: some messages got lost */
if (after(seq, STATE_SYNC(last_seq_recv)+1)) {
STATE_SYNC(error).msg_rcv_lost +=
seq - STATE_SYNC(last_seq_recv) + 1;
ret = SEQ_AFTER;
goto out;
}
/* out of sequence: replayed/delayed packet? */
if (before(seq, STATE_SYNC(last_seq_recv)+1)) {
STATE_SYNC(error).msg_rcv_before++;
ret = SEQ_BEFORE;
}
out:
*exp_seq = STATE_SYNC(last_seq_recv)+1;
return ret;
}
void nethdr_track_update_seq(uint32_t seq)
{
if (!local_seq_set)
local_seq_set = 1;
STATE_SYNC(last_seq_recv) = seq;
}
int nethdr_track_is_seq_set()
{
return local_seq_set;
}
#include "cache.h"
static int status2type[] = {
[C_OBJ_NEW] = NET_T_STATE_NEW,
[C_OBJ_ALIVE] = NET_T_STATE_UPD,
[C_OBJ_DEAD] = NET_T_STATE_DEL,
};
int object_status_to_network_type(int status)
{
return status2type[status];
}
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