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/*-
* 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.
*/
#ifdef _KERNEL
#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: npf_ext_log.c,v 1.17 2020/05/30 14:16:56 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>
#endif
#include "npf_impl.h"
#include "if_npflog.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, const nvlist_t *params)
{
npf_ext_log_t *meta;
meta = kmem_zalloc(sizeof(npf_ext_log_t), KM_SLEEP);
meta->if_idx = dnvlist_get_number(params, "log-interface", 0);
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, const npf_match_info_t *mi, int *decision)
{
struct mbuf *m = nbuf_head_mbuf(npc->npc_nbuf);
const npf_ext_log_t *log = meta;
struct psref psref;
ifnet_t *ifp;
struct npfloghdr hdr;
memset(&hdr, 0, sizeof(hdr));
/* Set the address family. */
if (npf_iscached(npc, NPC_IP4)) {
hdr.af = AF_INET;
} else if (npf_iscached(npc, NPC_IP6)) {
hdr.af = AF_INET6;
} else {
hdr.af = AF_UNSPEC;
}
hdr.length = NPFLOG_REAL_HDRLEN;
hdr.action = *decision == NPF_DECISION_PASS ?
0 /* pass */ : 1 /* block */;
hdr.reason = 0; /* match */
struct nbuf *nb = npc->npc_nbuf;
npf_ifmap_copyname(npc->npc_ctx, nb ? nb->nb_ifid : 0,
hdr.ifname, sizeof(hdr.ifname));
hdr.rulenr = htonl((uint32_t)mi->mi_rid);
hdr.subrulenr = htonl((uint32_t)(mi->mi_rid >> 32));
strlcpy(hdr.ruleset, "rules", sizeof(hdr.ruleset));
hdr.uid = UID_MAX;
hdr.pid = (pid_t)-1;
hdr.rule_uid = UID_MAX;
hdr.rule_pid = (pid_t)-1;
switch (mi->mi_di) {
default:
case PFIL_IN|PFIL_OUT:
hdr.dir = 0;
break;
case PFIL_IN:
hdr.dir = 1;
break;
case PFIL_OUT:
hdr.dir = 2;
break;
}
KERNEL_LOCK(1, NULL);
/* Find a pseudo-interface to log. */
ifp = if_get_byindex(log->if_idx, &psref);
if (ifp == NULL) {
/* No interface. */
KERNEL_UNLOCK_ONE(NULL);
return true;
}
if_statadd2(ifp, if_opackets, 1, if_obytes, m->m_pkthdr.len);
if (ifp->if_bpf) {
/* Pass through BPF. */
bpf_mtap2(ifp->if_bpf, &hdr, NPFLOG_HDRLEN, m, BPF_D_OUT);
}
if_put(ifp, &psref);
KERNEL_UNLOCK_ONE(NULL);
return true;
}
__dso_public int
npf_ext_log_init(npf_t *npf)
{
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
};
npf_ext_log_id = npf_ext_register(npf, "log", &npf_log_ops);
return npf_ext_log_id ? 0 : EEXIST;
}
__dso_public int
npf_ext_log_fini(npf_t *npf)
{
return npf_ext_unregister(npf, npf_ext_log_id);
}
#ifdef _KERNEL
static int
npf_ext_log_modcmd(modcmd_t cmd, void *arg)
{
npf_t *npf = npf_getkernctx();
switch (cmd) {
case MODULE_CMD_INIT:
return npf_ext_log_init(npf);
case MODULE_CMD_FINI:
return npf_ext_log_fini(npf);
break;
case MODULE_CMD_AUTOUNLOAD:
return npf_autounload_p() ? 0 : EBUSY;
default:
return ENOTTY;
}
return 0;
}
#endif
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