159 lines
3.9 KiB
C
159 lines
3.9 KiB
C
/* $NetBSD: npf_ext_log.c,v 1.8 2014/07/20 00:37:41 rmind Exp $ */
|
|
|
|
/*-
|
|
* Copyright (c) 2010-2012 The NetBSD Foundation, Inc.
|
|
* All rights reserved.
|
|
*
|
|
* This material is based upon work partially supported by The
|
|
* NetBSD Foundation under a contract with Mindaugas Rasiukevicius.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
* 1. Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in the
|
|
* documentation and/or other materials provided with the distribution.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
|
|
* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
|
|
* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
|
|
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
|
|
* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
|
|
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
|
|
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
|
|
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
|
|
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
|
|
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
|
|
* POSSIBILITY OF SUCH DAMAGE.
|
|
*/
|
|
|
|
/*
|
|
* NPF logging extension.
|
|
*/
|
|
|
|
#include <sys/cdefs.h>
|
|
__KERNEL_RCSID(0, "$NetBSD: npf_ext_log.c,v 1.8 2014/07/20 00:37:41 rmind Exp $");
|
|
|
|
#include <sys/types.h>
|
|
#include <sys/module.h>
|
|
|
|
#include <sys/conf.h>
|
|
#include <sys/kmem.h>
|
|
#include <sys/mbuf.h>
|
|
#include <sys/mutex.h>
|
|
#include <sys/queue.h>
|
|
|
|
#include <net/if.h>
|
|
#include <net/if_types.h>
|
|
#include <net/bpf.h>
|
|
|
|
#include "npf_impl.h"
|
|
|
|
NPF_EXT_MODULE(npf_ext_log, "");
|
|
|
|
#define NPFEXT_LOG_VER 1
|
|
|
|
static void * npf_ext_log_id;
|
|
|
|
typedef struct {
|
|
unsigned int if_idx;
|
|
} npf_ext_log_t;
|
|
|
|
static int
|
|
npf_log_ctor(npf_rproc_t *rp, prop_dictionary_t params)
|
|
{
|
|
npf_ext_log_t *meta;
|
|
|
|
meta = kmem_zalloc(sizeof(npf_ext_log_t), KM_SLEEP);
|
|
prop_dictionary_get_uint32(params, "log-interface", &meta->if_idx);
|
|
npf_rproc_assign(rp, meta);
|
|
return 0;
|
|
}
|
|
|
|
static void
|
|
npf_log_dtor(npf_rproc_t *rp, void *meta)
|
|
{
|
|
kmem_free(meta, sizeof(npf_ext_log_t));
|
|
}
|
|
|
|
static bool
|
|
npf_log(npf_cache_t *npc, void *meta, int *decision)
|
|
{
|
|
struct mbuf *m = nbuf_head_mbuf(npc->npc_nbuf);
|
|
const npf_ext_log_t *log = meta;
|
|
ifnet_t *ifp;
|
|
int family;
|
|
|
|
/* Set the address family. */
|
|
if (npf_iscached(npc, NPC_IP4)) {
|
|
family = AF_INET;
|
|
} else if (npf_iscached(npc, NPC_IP6)) {
|
|
family = AF_INET6;
|
|
} else {
|
|
family = AF_UNSPEC;
|
|
}
|
|
|
|
KERNEL_LOCK(1, NULL);
|
|
|
|
/* Find a pseudo-interface to log. */
|
|
ifp = if_byindex(log->if_idx);
|
|
if (ifp == NULL) {
|
|
/* No interface. */
|
|
KERNEL_UNLOCK_ONE(NULL);
|
|
return true;
|
|
}
|
|
|
|
/* Pass through BPF. */
|
|
ifp->if_opackets++;
|
|
ifp->if_obytes += m->m_pkthdr.len;
|
|
bpf_mtap_af(ifp, family, m);
|
|
KERNEL_UNLOCK_ONE(NULL);
|
|
|
|
return true;
|
|
}
|
|
|
|
/*
|
|
* Module interface.
|
|
*/
|
|
static int
|
|
npf_ext_log_modcmd(modcmd_t cmd, void *arg)
|
|
{
|
|
static const npf_ext_ops_t npf_log_ops = {
|
|
.version = NPFEXT_LOG_VER,
|
|
.ctx = NULL,
|
|
.ctor = npf_log_ctor,
|
|
.dtor = npf_log_dtor,
|
|
.proc = npf_log
|
|
};
|
|
int error;
|
|
|
|
switch (cmd) {
|
|
case MODULE_CMD_INIT:
|
|
/*
|
|
* Initialise the NPF logging extension.
|
|
*/
|
|
npf_ext_log_id = npf_ext_register("log", &npf_log_ops);
|
|
if (!npf_ext_log_id) {
|
|
return EEXIST;
|
|
}
|
|
break;
|
|
|
|
case MODULE_CMD_FINI:
|
|
error = npf_ext_unregister(npf_ext_log_id);
|
|
if (error) {
|
|
return error;
|
|
}
|
|
break;
|
|
|
|
case MODULE_CMD_AUTOUNLOAD:
|
|
/* Allow auto-unload only if NPF permits it. */
|
|
return npf_autounload_p() ? 0 : EBUSY;
|
|
|
|
default:
|
|
return ENOTTY;
|
|
}
|
|
return 0;
|
|
}
|