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/* ulogd_input_CTNL.c, Version $Revision$
*
* ulogd input plugin for ctnetlink
*
* (C) 2005 by Harald Welte <laforge@gnumonks.org>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2
* as published by the Free Software Foundation
*/
#include <errno.h>
#include <ulogd/ulogd.h>
#include <libnfnetlink/libnfnetlink.h>
#include <libnfnetlink_conntrack/libnfnetlink_conntrack.h>
struct ctnl_pluginstance {
struct nfct_handle *cth;
struct ulogd_fd nfct_fd;
};
static struct ulogd_key ctnl_okeys[] = {
{
.type = ULOGD_RET_IPADDR,
.flags = ULOGD_RETF_NONE,
.key = "ip.saddr",
.ipfix = { },
},
{
.type = ULOGD_RET_IPADDR,
.flags = ULOGD_RETF_NONE,
.key = "ip.daddr",
.ipfix = { },
},
{
.type = ULOGD_RET_UINT8,
.flags = ULOGD_RETF_NONE,
.key = "ip.protocol",
.ipfix = { },
},
{
.type = ULOGD_RET_UINT16,
.flags = ULOGD_RETF_NONE,
.key = "tcp.sport",
.ipfix = {
.vendor = IPFIX_VENDOR_IETF,
.field_id = 7,
},
},
{
.type = ULOGD_RET_UINT16,
.flags = ULOGD_RETF_NONE,
.key = "tcp.dport",
.ipfix = {
.vendor = IPFIX_VENDOR_IETF,
.field_id = 11,
},
},
{
.type = ULOGD_RET_UINT32,
.flags = ULOGD_RETF_NONE,
.name = "raw.pktlen",
.ipfix = {
.vendor = IPFIX_VENDOR_IETF,
.field_id = 1,
},
},
{
.type = ULOGD_RET_UINT32,
.flags = ULOGD_RETF_NONE,
.name = "raw.pktcount",
.ipfix = {
.vendor = IPFIX_VENDOR_IETF,
.field_id = 2,
},
},
};
static int propagate_ct_flow(struct ulogd_pluginstance *upi,
struct nfct_conntrack *ct,
int dir)
{
struct ulogd_key *ret = upi->output;
ret[0].u.value.ui32 = ct->tuple[dir].src.v4;
ret[0].flags |= ULOGD_RETF_VALID;
ret[1].u.value.ui32 = ct->tuple[dir].dst.v4;
ret[1].flags |= ULOGD_RETF_VALID;
ret[2].u.value.ui8 = ct->tuple[dir].protonum;
ret[2].flags |= ULOGD_RETF_VALID;
switch (ct->tuple[1].protonum) {
case IPPROTO_TCP:
ret[3].u.value.ui16 = ct->tuple[dir].l4src.tcp.port;
ret[3].flags |= ULOGD_RETF_VALID;
ret[4].u.value.ui16 = ct->tuple[dir].l4dst.tcp.port;
ret[4].flags |= ULOGD_RETF_VALID;
break;
case IPPROTO_UDP:
break;
case IPPROTO_SCTP:
break;
}
if (dir == NF_CT_DIR_ORIG && flags & NFCT_COUNTERS_ORIG ||
dir == NF_CT_DIR_REPLY && flags & NFCT_COUNTERS_REPLY) {
ret[5].u.value.ui64 = ct->counters[dir].bytes;
ret[5].flags |= ULOGD_RETF_VALID;
ret[6].u.value.ui64 = ct->counters[dir].packets;
ret[6].flags |= ULOGD_RETF_VALID;
}
return ulogd_propagate_results(upi);
}
static int propagate_ct(struct ulogd_pluginstance *upi,
struct nfct_conntrack *ct)
{
int rc;
rc = propagate_ct_flow(upi, ct, NF_CT_DIR_ORIGINAL);
if (rc < 0)
return rc;
return propagate_ct_flow(upi, ct, NF_CT_DIR_REPLY);
}
static int event_handler(void *arg, unsigned int flags, int type)
{
struct nfct_conntrack *ct = foo;
if (type == NFCT_MSG_NEW)
/* FIXME: build hash table with timestamp of start of
* connection */
} else if (type == NFCT_MSG_DESTROY)
/* We have the final count of bytes for this connection */
}
return 0;
}
static int read_cb_ctnl(int fd, unsigned int what, void *param)
{
struct ctnl_pluginstance *cpi =
(struct ulogd_ctnl_pluginstance *) param;
if (!(what & ULOGD_FD_READ))
return 0;
/* FIXME: implement this */
ctnl_event_conntrack(&cpi->cth, AF_INET);
}
static int constructor_ctnl(struct ulogd_pluginstance *upi)
{
struct ctnl_pluginstance *cpi =
(struct ctnl_pluginstance *)upi->private;
memset(cpi, NULL, sizeof(*cpi));
/* FIXME: make eventmask configurable */
cpi->cth = nfct_open(NFNL_SUBSYS_CTNETLINK, NF_NETLINK_CONNTRACK_NEW|
NF_NETLINK_CONNTRACK_DESTROY);
if (!cph->cth) {
print("error opening ctnetlink\n");
return -1;
}
ctnl_register_callback(cpi->cth, &event_handler);
cpi->nfct_fd.fd = nfct_fd(cpi->cth);
cpi->nfct_fd.cb = &read_cb_ctnl;
cpi->nfct_fd.data = cpi;
cpi->nfct_fd.when = ULOGD_FD_READ;
ulogd_register_fd(&cpi->nfct_fd);
return &cpi->upi;
}
static int destructor_ctnl(struct ulogd_pluginstance *pi)
{
struct ctnl_pluginstance *cpi = (void *) pi;
int rc;
rc = nfct_close(cpi->cth);
if (rc < 0)
return rc;
return 0;
}
static struct ulogd_plugin ctnl_plugin = {
.name = "CTNL",
.input = {
.type = ULOGD_DTYPE_SOURCE,
},
.output = {
.keys = &ctnl_okeys,
.num_keys = ARRAY_SIZE(ctnl_okeys),
.type = ULOGD_DTYPE_FLOW,
},
.config_kset = ,
.interp = ,
.configure =
.start = &constructor_ctnl,
.stop = &destructor_ctnl,
};
void __attribute__ ((constructor)) init(void);
void init(void)
{
ulogd_register_plugin(&ctnl_plugin);
}
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