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/* ulogd_inppkt_ULOG.c - stackable input plugin for ULOG packets -> ulogd2
* (C) 2004 by Harald Welte <laforge@gnumonks.org>
*/
#include <ulogd/ulogd.h>
#include <ulogd/conffile.h>
#include <libipulog/libipulog.h>
/* Size of the socket recevive memory. Should be at least the same size as the
* 'nlbufsiz' module loadtime parameter of ipt_ULOG.o
* If you have _big_ in-kernel queues, you may have to increase this number. (
* --qthreshold 100 * 1500 bytes/packet = 150kB */
#define ULOGD_RMEM_DEFAULT 131071
/* Size of the receive buffer for the netlink socket. Should be at least of
* RMEM_DEFAULT size. */
#define ULOGD_BUFSIZE_DEFAULT 150000
static config_entry_t bufsiz_ce = { NULL, "bufsize", CONFIG_TYPE_INT,
CONFIG_OPT_NONE, 0,
{ value: ULOGD_BUFSIZE_DEFAULT } };
static config_entry_t nlgroup_ce = { &bufsiz_ce, "nlgroup", CONFIG_TYPE_INT,
CONFIG_OPT_NONE, 0,
{ value: ULOGD_NLGROUP_DEFAULT } };
static config_entry_t rmem_ce = { &nlgroup_ce, "rmem", CONFIG_TYPE_INT,
CONFIG_OPT_NONE, 0,
{ value: ULOGD_RMEM_DEFAULT } };
struct ulog_input {
struct ipulog_handle *libulog_h;
static unsigned char *libulog_buf;
static struct ulogd_fd ulog_fd;
};
/* call all registered interpreters and hand the results over to
* propagate_results */
static void handle_packet(ulog_packet_msg_t *pkt)
{
ulog_iret_t *ret;
ulog_iret_t *allret = NULL;
ulog_interpreter_t *ip;
unsigned int i,j;
/* If there are no interpreters registered yet,
* ignore this packet */
if (!ulogd_interh_ids) {
ulogd_log(ULOGD_NOTICE,
"packet received, but no interpreters found\n");
return;
}
for (i = 1; i <= ulogd_interh_ids; i++) {
ip = ulogd_interh[i];
/* call interpreter */
if ((ret = ((ip)->interp)(ip, pkt))) {
/* create references for result linked-list */
for (j = 0; j < ip->key_num; j++) {
if (IS_VALID(ip->result[j])) {
ip->result[j].cur_next = allret;
allret = &ip->result[j];
}
}
}
}
propagate_results(allret);
clean_results(ulogd_interpreters->result);
}
static struct ulog_read_cb(int fd, void *param)
{
struct ulog_input *u = (struct ulog_input *)param;
int len;
while (len = ipulog_read(u->libulog_h, u->libulog_buf,
bufsiz_ce.u.value, 1)) {
if (len <= 0) {
/* this is not supposed to happen */
ulogd_log(ULOGD_ERROR, "ipulog_read = %d! "
"ipulog_errno = %d, errno = %d\n",
len, ipulog_errno, errno);
break;
}
while ((upkt = ipulog_get_paccket(u->libulog_h,
u->libulog_buf, len))) {
DEBUGP("==> ulog packet received\n");
handle_packet(upkt);
}
}
return 0;
}
static struct ulog_input *new_instance()
{
struct ulog_input *ui = malloc(sizeof(*ui));
if (!ui)
return NULL;
ui->libulog_buf = malloc(bufsiz_ce.u.value);
if (!ui->libulog_buf)
return NULL;
ui->libulog_h = ipulog_create_handle(
ipulog_group2gmask(nlgroup_ce.u.value),
rmem_ce.u.value);
if (!libulog_h)
return NULL;
ui->ulog_fd.fd = ui->libulog_h->fd;
ui->ulog_fd.cb = &ulog_read_cb;
ui->ulog_fd.data = ui;
return ui;
}
static struct ulogd_pluginstance *init()
{
struct ulog_input *ui = new_instance();
ulogd_register_fd(&ui->ulog_fd);
}
struct ulogd_plugin libulog_plugin = {
.name = "ULOG",
.input_type = ULOGD_DTYPE_NULL,
.output_type = ULOGD_DTYPE_RAW,
.constructor = &init,
.input_fn = &input,
.configs = &rmem_ce,
};
void _init(void)
{
ulogd_register_plugin(&libulog_plugin);
}
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