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alistair23-linux/net/netfilter/nfnetlink_log.c
Kees Cook e99e88a9d2 treewide: setup_timer() -> timer_setup() 
This converts all remaining cases of the old setup_timer() API into using
timer_setup(), where the callback argument is the structure already
holding the struct timer_list. These should have no behavioral changes,
since they just change which pointer is passed into the callback with
the same available pointers after conversion. It handles the following
examples, in addition to some other variations.

Casting from unsigned long:

    void my_callback(unsigned long data)
    {
        struct something *ptr = (struct something *)data;
    ...
    }
    ...
    setup_timer(&ptr->my_timer, my_callback, ptr);

and forced object casts:

    void my_callback(struct something *ptr)
    {
    ...
    }
    ...
    setup_timer(&ptr->my_timer, my_callback, (unsigned long)ptr);

become:

    void my_callback(struct timer_list *t)
    {
        struct something *ptr = from_timer(ptr, t, my_timer);
    ...
    }
    ...
    timer_setup(&ptr->my_timer, my_callback, 0);

Direct function assignments:

    void my_callback(unsigned long data)
    {
        struct something *ptr = (struct something *)data;
    ...
    }
    ...
    ptr->my_timer.function = my_callback;

have a temporary cast added, along with converting the args:

    void my_callback(struct timer_list *t)
    {
        struct something *ptr = from_timer(ptr, t, my_timer);
    ...
    }
    ...
    ptr->my_timer.function = (TIMER_FUNC_TYPE)my_callback;

And finally, callbacks without a data assignment:

    void my_callback(unsigned long data)
    {
    ...
    }
    ...
    setup_timer(&ptr->my_timer, my_callback, 0);

have their argument renamed to verify they're unused during conversion:

    void my_callback(struct timer_list *unused)
    {
    ...
    }
    ...
    timer_setup(&ptr->my_timer, my_callback, 0);

The conversion is done with the following Coccinelle script:

spatch --very-quiet --all-includes --include-headers \
	-I ./arch/x86/include -I ./arch/x86/include/generated \
	-I ./include -I ./arch/x86/include/uapi \
	-I ./arch/x86/include/generated/uapi -I ./include/uapi \
	-I ./include/generated/uapi --include ./include/linux/kconfig.h \
	--dir . \
	--cocci-file ~/src/data/timer_setup.cocci

@fix_address_of@
expression e;
@@

 setup_timer(
-&(e)
+&e
 , ...)

// Update any raw setup_timer() usages that have a NULL callback, but
// would otherwise match change_timer_function_usage, since the latter
// will update all function assignments done in the face of a NULL
// function initialization in setup_timer().
@change_timer_function_usage_NULL@
expression _E;
identifier _timer;
type _cast_data;
@@

(
-setup_timer(&_E->_timer, NULL, _E);
+timer_setup(&_E->_timer, NULL, 0);
|
-setup_timer(&_E->_timer, NULL, (_cast_data)_E);
+timer_setup(&_E->_timer, NULL, 0);
|
-setup_timer(&_E._timer, NULL, &_E);
+timer_setup(&_E._timer, NULL, 0);
|
-setup_timer(&_E._timer, NULL, (_cast_data)&_E);
+timer_setup(&_E._timer, NULL, 0);
)

@change_timer_function_usage@
expression _E;
identifier _timer;
struct timer_list _stl;
identifier _callback;
type _cast_func, _cast_data;
@@

(
-setup_timer(&_E->_timer, _callback, _E);
+timer_setup(&_E->_timer, _callback, 0);
|
-setup_timer(&_E->_timer, &_callback, _E);
+timer_setup(&_E->_timer, _callback, 0);
|
-setup_timer(&_E->_timer, _callback, (_cast_data)_E);
+timer_setup(&_E->_timer, _callback, 0);
|
-setup_timer(&_E->_timer, &_callback, (_cast_data)_E);
+timer_setup(&_E->_timer, _callback, 0);
|
-setup_timer(&_E->_timer, (_cast_func)_callback, _E);
+timer_setup(&_E->_timer, _callback, 0);
|
-setup_timer(&_E->_timer, (_cast_func)&_callback, _E);
+timer_setup(&_E->_timer, _callback, 0);
|
-setup_timer(&_E->_timer, (_cast_func)_callback, (_cast_data)_E);
+timer_setup(&_E->_timer, _callback, 0);
|
-setup_timer(&_E->_timer, (_cast_func)&_callback, (_cast_data)_E);
+timer_setup(&_E->_timer, _callback, 0);
|
-setup_timer(&_E._timer, _callback, (_cast_data)_E);
+timer_setup(&_E._timer, _callback, 0);
|
-setup_timer(&_E._timer, _callback, (_cast_data)&_E);
+timer_setup(&_E._timer, _callback, 0);
|
-setup_timer(&_E._timer, &_callback, (_cast_data)_E);
+timer_setup(&_E._timer, _callback, 0);
|
-setup_timer(&_E._timer, &_callback, (_cast_data)&_E);
+timer_setup(&_E._timer, _callback, 0);
|
-setup_timer(&_E._timer, (_cast_func)_callback, (_cast_data)_E);
+timer_setup(&_E._timer, _callback, 0);
|
-setup_timer(&_E._timer, (_cast_func)_callback, (_cast_data)&_E);
+timer_setup(&_E._timer, _callback, 0);
|
-setup_timer(&_E._timer, (_cast_func)&_callback, (_cast_data)_E);
+timer_setup(&_E._timer, _callback, 0);
|
-setup_timer(&_E._timer, (_cast_func)&_callback, (_cast_data)&_E);
+timer_setup(&_E._timer, _callback, 0);
|
 _E->_timer@_stl.function = _callback;
|
 _E->_timer@_stl.function = &_callback;
|
 _E->_timer@_stl.function = (_cast_func)_callback;
|
 _E->_timer@_stl.function = (_cast_func)&_callback;
|
 _E._timer@_stl.function = _callback;
|
 _E._timer@_stl.function = &_callback;
|
 _E._timer@_stl.function = (_cast_func)_callback;
|
 _E._timer@_stl.function = (_cast_func)&_callback;
)

// callback(unsigned long arg)
@change_callback_handle_cast
 depends on change_timer_function_usage@
identifier change_timer_function_usage._callback;
identifier change_timer_function_usage._timer;
type _origtype;
identifier _origarg;
type _handletype;
identifier _handle;
@@

 void _callback(
-_origtype _origarg
+struct timer_list *t
 )
 {
(
	... when != _origarg
	_handletype *_handle =
-(_handletype *)_origarg;
+from_timer(_handle, t, _timer);
	... when != _origarg
|
	... when != _origarg
	_handletype *_handle =
-(void *)_origarg;
+from_timer(_handle, t, _timer);
	... when != _origarg
|
	... when != _origarg
	_handletype *_handle;
	... when != _handle
	_handle =
-(_handletype *)_origarg;
+from_timer(_handle, t, _timer);
	... when != _origarg
|
	... when != _origarg
	_handletype *_handle;
	... when != _handle
	_handle =
-(void *)_origarg;
+from_timer(_handle, t, _timer);
	... when != _origarg
)
 }

// callback(unsigned long arg) without existing variable
@change_callback_handle_cast_no_arg
 depends on change_timer_function_usage &&
                     !change_callback_handle_cast@
identifier change_timer_function_usage._callback;
identifier change_timer_function_usage._timer;
type _origtype;
identifier _origarg;
type _handletype;
@@

 void _callback(
-_origtype _origarg
+struct timer_list *t
 )
 {
+	_handletype *_origarg = from_timer(_origarg, t, _timer);
+
	... when != _origarg
-	(_handletype *)_origarg
+	_origarg
	... when != _origarg
 }

// Avoid already converted callbacks.
@match_callback_converted
 depends on change_timer_function_usage &&
            !change_callback_handle_cast &&
	    !change_callback_handle_cast_no_arg@
identifier change_timer_function_usage._callback;
identifier t;
@@

 void _callback(struct timer_list *t)
 { ... }

// callback(struct something *handle)
@change_callback_handle_arg
 depends on change_timer_function_usage &&
	    !match_callback_converted &&
            !change_callback_handle_cast &&
            !change_callback_handle_cast_no_arg@
identifier change_timer_function_usage._callback;
identifier change_timer_function_usage._timer;
type _handletype;
identifier _handle;
@@

 void _callback(
-_handletype *_handle
+struct timer_list *t
 )
 {
+	_handletype *_handle = from_timer(_handle, t, _timer);
	...
 }

// If change_callback_handle_arg ran on an empty function, remove
// the added handler.
@unchange_callback_handle_arg
 depends on change_timer_function_usage &&
	    change_callback_handle_arg@
identifier change_timer_function_usage._callback;
identifier change_timer_function_usage._timer;
type _handletype;
identifier _handle;
identifier t;
@@

 void _callback(struct timer_list *t)
 {
-	_handletype *_handle = from_timer(_handle, t, _timer);
 }

// We only want to refactor the setup_timer() data argument if we've found
// the matching callback. This undoes changes in change_timer_function_usage.
@unchange_timer_function_usage
 depends on change_timer_function_usage &&
            !change_callback_handle_cast &&
            !change_callback_handle_cast_no_arg &&
	    !change_callback_handle_arg@
expression change_timer_function_usage._E;
identifier change_timer_function_usage._timer;
identifier change_timer_function_usage._callback;
type change_timer_function_usage._cast_data;
@@

(
-timer_setup(&_E->_timer, _callback, 0);
+setup_timer(&_E->_timer, _callback, (_cast_data)_E);
|
-timer_setup(&_E._timer, _callback, 0);
+setup_timer(&_E._timer, _callback, (_cast_data)&_E);
)

// If we fixed a callback from a .function assignment, fix the
// assignment cast now.
@change_timer_function_assignment
 depends on change_timer_function_usage &&
            (change_callback_handle_cast ||
             change_callback_handle_cast_no_arg ||
             change_callback_handle_arg)@
expression change_timer_function_usage._E;
identifier change_timer_function_usage._timer;
identifier change_timer_function_usage._callback;
type _cast_func;
typedef TIMER_FUNC_TYPE;
@@

(
 _E->_timer.function =
-_callback
+(TIMER_FUNC_TYPE)_callback
 ;
|
 _E->_timer.function =
-&_callback
+(TIMER_FUNC_TYPE)_callback
 ;
|
 _E->_timer.function =
-(_cast_func)_callback;
+(TIMER_FUNC_TYPE)_callback
 ;
|
 _E->_timer.function =
-(_cast_func)&_callback
+(TIMER_FUNC_TYPE)_callback
 ;
|
 _E._timer.function =
-_callback
+(TIMER_FUNC_TYPE)_callback
 ;
|
 _E._timer.function =
-&_callback;
+(TIMER_FUNC_TYPE)_callback
 ;
|
 _E._timer.function =
-(_cast_func)_callback
+(TIMER_FUNC_TYPE)_callback
 ;
|
 _E._timer.function =
-(_cast_func)&_callback
+(TIMER_FUNC_TYPE)_callback
 ;
)

// Sometimes timer functions are called directly. Replace matched args.
@change_timer_function_calls
 depends on change_timer_function_usage &&
            (change_callback_handle_cast ||
             change_callback_handle_cast_no_arg ||
             change_callback_handle_arg)@
expression _E;
identifier change_timer_function_usage._timer;
identifier change_timer_function_usage._callback;
type _cast_data;
@@

 _callback(
(
-(_cast_data)_E
+&_E->_timer
|
-(_cast_data)&_E
+&_E._timer
|
-_E
+&_E->_timer
)
 )

// If a timer has been configured without a data argument, it can be
// converted without regard to the callback argument, since it is unused.
@match_timer_function_unused_data@
expression _E;
identifier _timer;
identifier _callback;
@@

(
-setup_timer(&_E->_timer, _callback, 0);
+timer_setup(&_E->_timer, _callback, 0);
|
-setup_timer(&_E->_timer, _callback, 0L);
+timer_setup(&_E->_timer, _callback, 0);
|
-setup_timer(&_E->_timer, _callback, 0UL);
+timer_setup(&_E->_timer, _callback, 0);
|
-setup_timer(&_E._timer, _callback, 0);
+timer_setup(&_E._timer, _callback, 0);
|
-setup_timer(&_E._timer, _callback, 0L);
+timer_setup(&_E._timer, _callback, 0);
|
-setup_timer(&_E._timer, _callback, 0UL);
+timer_setup(&_E._timer, _callback, 0);
|
-setup_timer(&_timer, _callback, 0);
+timer_setup(&_timer, _callback, 0);
|
-setup_timer(&_timer, _callback, 0L);
+timer_setup(&_timer, _callback, 0);
|
-setup_timer(&_timer, _callback, 0UL);
+timer_setup(&_timer, _callback, 0);
|
-setup_timer(_timer, _callback, 0);
+timer_setup(_timer, _callback, 0);
|
-setup_timer(_timer, _callback, 0L);
+timer_setup(_timer, _callback, 0);
|
-setup_timer(_timer, _callback, 0UL);
+timer_setup(_timer, _callback, 0);
)

@change_callback_unused_data
 depends on match_timer_function_unused_data@
identifier match_timer_function_unused_data._callback;
type _origtype;
identifier _origarg;
@@

 void _callback(
-_origtype _origarg
+struct timer_list *unused
 )
 {
	... when != _origarg
 }

Signed-off-by: Kees Cook <keescook@chromium.org>
2017-11-21 15:57:07 -08:00

1163 lines
28 KiB
C
Raw Blame History

/*
* This is a module which is used for logging packets to userspace via
* nfetlink.
*
* (C) 2005 by Harald Welte <laforge@netfilter.org>
* (C) 2006-2012 Patrick McHardy <kaber@trash.net>
*
* Based on the old ipv4-only ipt_ULOG.c:
* (C) 2000-2004 by Harald Welte <laforge@netfilter.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.
*/
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
#include <linux/module.h>
#include <linux/skbuff.h>
#include <linux/if_arp.h>
#include <linux/init.h>
#include <linux/ip.h>
#include <linux/ipv6.h>
#include <linux/netdevice.h>
#include <linux/netfilter.h>
#include <linux/netfilter_bridge.h>
#include <net/netlink.h>
#include <linux/netfilter/nfnetlink.h>
#include <linux/netfilter/nfnetlink_log.h>
#include <linux/netfilter/nf_conntrack_common.h>
#include <linux/spinlock.h>
#include <linux/sysctl.h>
#include <linux/proc_fs.h>
#include <linux/security.h>
#include <linux/list.h>
#include <linux/slab.h>
#include <net/sock.h>
#include <net/netfilter/nf_log.h>
#include <net/netns/generic.h>
#include <net/netfilter/nfnetlink_log.h>
#include <linux/atomic.h>
#include <linux/refcount.h>
#if IS_ENABLED(CONFIG_BRIDGE_NETFILTER)
#include "../bridge/br_private.h"
#endif
#define NFULNL_NLBUFSIZ_DEFAULT NLMSG_GOODSIZE
#define NFULNL_TIMEOUT_DEFAULT 100 /* every second */
#define NFULNL_QTHRESH_DEFAULT 100 /* 100 packets */
/* max packet size is limited by 16-bit struct nfattr nfa_len field */
#define NFULNL_COPY_RANGE_MAX (0xFFFF - NLA_HDRLEN)
#define PRINTR(x, args...) do { if (net_ratelimit()) \
printk(x, ## args); } while (0);
struct nfulnl_instance {
struct hlist_node hlist; /* global list of instances */
spinlock_t lock;
refcount_t use; /* use count */
unsigned int qlen; /* number of nlmsgs in skb */
struct sk_buff *skb; /* pre-allocatd skb */
struct timer_list timer;
struct net *net;
struct user_namespace *peer_user_ns; /* User namespace of the peer process */
u32 peer_portid; /* PORTID of the peer process */
/* configurable parameters */
unsigned int flushtimeout; /* timeout until queue flush */
unsigned int nlbufsiz; /* netlink buffer allocation size */
unsigned int qthreshold; /* threshold of the queue */
u_int32_t copy_range;
u_int32_t seq; /* instance-local sequential counter */
u_int16_t group_num; /* number of this queue */
u_int16_t flags;
u_int8_t copy_mode;
struct rcu_head rcu;
};
#define INSTANCE_BUCKETS 16
static unsigned int nfnl_log_net_id __read_mostly;
struct nfnl_log_net {
spinlock_t instances_lock;
struct hlist_head instance_table[INSTANCE_BUCKETS];
atomic_t global_seq;
};
static struct nfnl_log_net *nfnl_log_pernet(struct net *net)
{
return net_generic(net, nfnl_log_net_id);
}
static inline u_int8_t instance_hashfn(u_int16_t group_num)
{
return ((group_num & 0xff) % INSTANCE_BUCKETS);
}
static struct nfulnl_instance *
__instance_lookup(struct nfnl_log_net *log, u_int16_t group_num)
{
struct hlist_head *head;
struct nfulnl_instance *inst;
head = &log->instance_table[instance_hashfn(group_num)];
hlist_for_each_entry_rcu(inst, head, hlist) {
if (inst->group_num == group_num)
return inst;
}
return NULL;
}
static inline void
instance_get(struct nfulnl_instance *inst)
{
refcount_inc(&inst->use);
}
static struct nfulnl_instance *
instance_lookup_get(struct nfnl_log_net *log, u_int16_t group_num)
{
struct nfulnl_instance *inst;
rcu_read_lock_bh();
inst = __instance_lookup(log, group_num);
if (inst && !refcount_inc_not_zero(&inst->use))
inst = NULL;
rcu_read_unlock_bh();
return inst;
}
static void nfulnl_instance_free_rcu(struct rcu_head *head)
{
struct nfulnl_instance *inst =
container_of(head, struct nfulnl_instance, rcu);
put_net(inst->net);
kfree(inst);
module_put(THIS_MODULE);
}
static void
instance_put(struct nfulnl_instance *inst)
{
if (inst && refcount_dec_and_test(&inst->use))
call_rcu_bh(&inst->rcu, nfulnl_instance_free_rcu);
}
static void nfulnl_timer(struct timer_list *t);
static struct nfulnl_instance *
instance_create(struct net *net, u_int16_t group_num,
u32 portid, struct user_namespace *user_ns)
{
struct nfulnl_instance *inst;
struct nfnl_log_net *log = nfnl_log_pernet(net);
int err;
spin_lock_bh(&log->instances_lock);
if (__instance_lookup(log, group_num)) {
err = -EEXIST;
goto out_unlock;
}
inst = kzalloc(sizeof(*inst), GFP_ATOMIC);
if (!inst) {
err = -ENOMEM;
goto out_unlock;
}
if (!try_module_get(THIS_MODULE)) {
kfree(inst);
err = -EAGAIN;
goto out_unlock;
}
INIT_HLIST_NODE(&inst->hlist);
spin_lock_init(&inst->lock);
/* needs to be two, since we _put() after creation */
refcount_set(&inst->use, 2);
timer_setup(&inst->timer, nfulnl_timer, 0);
inst->net = get_net(net);
inst->peer_user_ns = user_ns;
inst->peer_portid = portid;
inst->group_num = group_num;
inst->qthreshold = NFULNL_QTHRESH_DEFAULT;
inst->flushtimeout = NFULNL_TIMEOUT_DEFAULT;
inst->nlbufsiz = NFULNL_NLBUFSIZ_DEFAULT;
inst->copy_mode = NFULNL_COPY_PACKET;
inst->copy_range = NFULNL_COPY_RANGE_MAX;
hlist_add_head_rcu(&inst->hlist,
&log->instance_table[instance_hashfn(group_num)]);
spin_unlock_bh(&log->instances_lock);
return inst;
out_unlock:
spin_unlock_bh(&log->instances_lock);
return ERR_PTR(err);
}
static void __nfulnl_flush(struct nfulnl_instance *inst);
/* called with BH disabled */
static void
__instance_destroy(struct nfulnl_instance *inst)
{
/* first pull it out of the global list */
hlist_del_rcu(&inst->hlist);
/* then flush all pending packets from skb */
spin_lock(&inst->lock);
/* lockless readers wont be able to use us */
inst->copy_mode = NFULNL_COPY_DISABLED;
if (inst->skb)
__nfulnl_flush(inst);
spin_unlock(&inst->lock);
/* and finally put the refcount */
instance_put(inst);
}
static inline void
instance_destroy(struct nfnl_log_net *log,
struct nfulnl_instance *inst)
{
spin_lock_bh(&log->instances_lock);
__instance_destroy(inst);
spin_unlock_bh(&log->instances_lock);
}
static int
nfulnl_set_mode(struct nfulnl_instance *inst, u_int8_t mode,
unsigned int range)
{
int status = 0;
spin_lock_bh(&inst->lock);
switch (mode) {
case NFULNL_COPY_NONE:
case NFULNL_COPY_META:
inst->copy_mode = mode;
inst->copy_range = 0;
break;
case NFULNL_COPY_PACKET:
inst->copy_mode = mode;
if (range == 0)
range = NFULNL_COPY_RANGE_MAX;
inst->copy_range = min_t(unsigned int,
range, NFULNL_COPY_RANGE_MAX);
break;
default:
status = -EINVAL;
break;
}
spin_unlock_bh(&inst->lock);
return status;
}
static int
nfulnl_set_nlbufsiz(struct nfulnl_instance *inst, u_int32_t nlbufsiz)
{
int status;
spin_lock_bh(&inst->lock);
if (nlbufsiz < NFULNL_NLBUFSIZ_DEFAULT)
status = -ERANGE;
else if (nlbufsiz > 131072)
status = -ERANGE;
else {
inst->nlbufsiz = nlbufsiz;
status = 0;
}
spin_unlock_bh(&inst->lock);
return status;
}
static void
nfulnl_set_timeout(struct nfulnl_instance *inst, u_int32_t timeout)
{
spin_lock_bh(&inst->lock);
inst->flushtimeout = timeout;
spin_unlock_bh(&inst->lock);
}
static void
nfulnl_set_qthresh(struct nfulnl_instance *inst, u_int32_t qthresh)
{
spin_lock_bh(&inst->lock);
inst->qthreshold = qthresh;
spin_unlock_bh(&inst->lock);
}
static int
nfulnl_set_flags(struct nfulnl_instance *inst, u_int16_t flags)
{
spin_lock_bh(&inst->lock);
inst->flags = flags;
spin_unlock_bh(&inst->lock);
return 0;
}
static struct sk_buff *
nfulnl_alloc_skb(struct net *net, u32 peer_portid, unsigned int inst_size,
unsigned int pkt_size)
{
struct sk_buff *skb;
unsigned int n;
/* alloc skb which should be big enough for a whole multipart
* message. WARNING: has to be <= 128k due to slab restrictions */
n = max(inst_size, pkt_size);
skb = alloc_skb(n, GFP_ATOMIC | __GFP_NOWARN);
if (!skb) {
if (n > pkt_size) {
/* try to allocate only as much as we need for current
* packet */
skb = alloc_skb(pkt_size, GFP_ATOMIC);
}
}
return skb;
}
static void
__nfulnl_send(struct nfulnl_instance *inst)
{
if (inst->qlen > 1) {
struct nlmsghdr *nlh = nlmsg_put(inst->skb, 0, 0,
NLMSG_DONE,
sizeof(struct nfgenmsg),
0);
if (WARN_ONCE(!nlh, "bad nlskb size: %u, tailroom %d\n",
inst->skb->len, skb_tailroom(inst->skb))) {
kfree_skb(inst->skb);
goto out;
}
}
nfnetlink_unicast(inst->skb, inst->net, inst->peer_portid,
MSG_DONTWAIT);
out:
inst->qlen = 0;
inst->skb = NULL;
}
static void
__nfulnl_flush(struct nfulnl_instance *inst)
{
/* timer holds a reference */
if (del_timer(&inst->timer))
instance_put(inst);
if (inst->skb)
__nfulnl_send(inst);
}
static void
nfulnl_timer(struct timer_list *t)
{
struct nfulnl_instance *inst = from_timer(inst, t, timer);
spin_lock_bh(&inst->lock);
if (inst->skb)
__nfulnl_send(inst);
spin_unlock_bh(&inst->lock);
instance_put(inst);
}
/* This is an inline function, we don't really care about a long
* list of arguments */
static inline int
__build_packet_message(struct nfnl_log_net *log,
struct nfulnl_instance *inst,
const struct sk_buff *skb,
unsigned int data_len,
u_int8_t pf,
unsigned int hooknum,
const struct net_device *indev,
const struct net_device *outdev,
const char *prefix, unsigned int plen,
const struct nfnl_ct_hook *nfnl_ct,
struct nf_conn *ct, enum ip_conntrack_info ctinfo)
{
struct nfulnl_msg_packet_hdr pmsg;
struct nlmsghdr *nlh;
struct nfgenmsg *nfmsg;
sk_buff_data_t old_tail = inst->skb->tail;
struct sock *sk;
const unsigned char *hwhdrp;
nlh = nlmsg_put(inst->skb, 0, 0,
nfnl_msg_type(NFNL_SUBSYS_ULOG, NFULNL_MSG_PACKET),
sizeof(struct nfgenmsg), 0);
if (!nlh)
return -1;
nfmsg = nlmsg_data(nlh);
nfmsg->nfgen_family = pf;
nfmsg->version = NFNETLINK_V0;
nfmsg->res_id = htons(inst->group_num);
memset(&pmsg, 0, sizeof(pmsg));
pmsg.hw_protocol = skb->protocol;
pmsg.hook = hooknum;
if (nla_put(inst->skb, NFULA_PACKET_HDR, sizeof(pmsg), &pmsg))
goto nla_put_failure;
if (prefix &&
nla_put(inst->skb, NFULA_PREFIX, plen, prefix))
goto nla_put_failure;
if (indev) {
#if !IS_ENABLED(CONFIG_BRIDGE_NETFILTER)
if (nla_put_be32(inst->skb, NFULA_IFINDEX_INDEV,
htonl(indev->ifindex)))
goto nla_put_failure;
#else
if (pf == PF_BRIDGE) {
/* Case 1: outdev is physical input device, we need to
* look for bridge group (when called from
* netfilter_bridge) */
if (nla_put_be32(inst->skb, NFULA_IFINDEX_PHYSINDEV,
htonl(indev->ifindex)) ||
/* this is the bridge group "brX" */
/* rcu_read_lock()ed by nf_hook_thresh or
* nf_log_packet.
*/
nla_put_be32(inst->skb, NFULA_IFINDEX_INDEV,
htonl(br_port_get_rcu(indev)->br->dev->ifindex)))
goto nla_put_failure;
} else {
struct net_device *physindev;
/* Case 2: indev is bridge group, we need to look for
* physical device (when called from ipv4) */
if (nla_put_be32(inst->skb, NFULA_IFINDEX_INDEV,
htonl(indev->ifindex)))
goto nla_put_failure;
physindev = nf_bridge_get_physindev(skb);
if (physindev &&
nla_put_be32(inst->skb, NFULA_IFINDEX_PHYSINDEV,
htonl(physindev->ifindex)))
goto nla_put_failure;
}
#endif
}
if (outdev) {
#if !IS_ENABLED(CONFIG_BRIDGE_NETFILTER)
if (nla_put_be32(inst->skb, NFULA_IFINDEX_OUTDEV,
htonl(outdev->ifindex)))
goto nla_put_failure;
#else
if (pf == PF_BRIDGE) {
/* Case 1: outdev is physical output device, we need to
* look for bridge group (when called from
* netfilter_bridge) */
if (nla_put_be32(inst->skb, NFULA_IFINDEX_PHYSOUTDEV,
htonl(outdev->ifindex)) ||
/* this is the bridge group "brX" */
/* rcu_read_lock()ed by nf_hook_thresh or
* nf_log_packet.
*/
nla_put_be32(inst->skb, NFULA_IFINDEX_OUTDEV,
htonl(br_port_get_rcu(outdev)->br->dev->ifindex)))
goto nla_put_failure;
} else {
struct net_device *physoutdev;
/* Case 2: indev is a bridge group, we need to look
* for physical device (when called from ipv4) */
if (nla_put_be32(inst->skb, NFULA_IFINDEX_OUTDEV,
htonl(outdev->ifindex)))
goto nla_put_failure;
physoutdev = nf_bridge_get_physoutdev(skb);
if (physoutdev &&
nla_put_be32(inst->skb, NFULA_IFINDEX_PHYSOUTDEV,
htonl(physoutdev->ifindex)))
goto nla_put_failure;
}
#endif
}
if (skb->mark &&
nla_put_be32(inst->skb, NFULA_MARK, htonl(skb->mark)))
goto nla_put_failure;
if (indev && skb->dev &&
skb->mac_header != skb->network_header) {
struct nfulnl_msg_packet_hw phw;
int len;
memset(&phw, 0, sizeof(phw));
len = dev_parse_header(skb, phw.hw_addr);
if (len > 0) {
phw.hw_addrlen = htons(len);
if (nla_put(inst->skb, NFULA_HWADDR, sizeof(phw), &phw))
goto nla_put_failure;
}
}
if (indev && skb_mac_header_was_set(skb)) {
if (nla_put_be16(inst->skb, NFULA_HWTYPE, htons(skb->dev->type)) ||
nla_put_be16(inst->skb, NFULA_HWLEN,
htons(skb->dev->hard_header_len)))
goto nla_put_failure;
hwhdrp = skb_mac_header(skb);
if (skb->dev->type == ARPHRD_SIT)
hwhdrp -= ETH_HLEN;
if (hwhdrp >= skb->head &&
nla_put(inst->skb, NFULA_HWHEADER,
skb->dev->hard_header_len, hwhdrp))
goto nla_put_failure;
}
if (skb->tstamp) {
struct nfulnl_msg_packet_timestamp ts;
struct timespec64 kts = ktime_to_timespec64(skb->tstamp);
ts.sec = cpu_to_be64(kts.tv_sec);
ts.usec = cpu_to_be64(kts.tv_nsec / NSEC_PER_USEC);
if (nla_put(inst->skb, NFULA_TIMESTAMP, sizeof(ts), &ts))
goto nla_put_failure;
}
/* UID */
sk = skb->sk;
if (sk && sk_fullsock(sk)) {
read_lock_bh(&sk->sk_callback_lock);
if (sk->sk_socket && sk->sk_socket->file) {
struct file *file = sk->sk_socket->file;
const struct cred *cred = file->f_cred;
struct user_namespace *user_ns = inst->peer_user_ns;
__be32 uid = htonl(from_kuid_munged(user_ns, cred->fsuid));
__be32 gid = htonl(from_kgid_munged(user_ns, cred->fsgid));
read_unlock_bh(&sk->sk_callback_lock);
if (nla_put_be32(inst->skb, NFULA_UID, uid) ||
nla_put_be32(inst->skb, NFULA_GID, gid))
goto nla_put_failure;
} else
read_unlock_bh(&sk->sk_callback_lock);
}
/* local sequence number */
if ((inst->flags & NFULNL_CFG_F_SEQ) &&
nla_put_be32(inst->skb, NFULA_SEQ, htonl(inst->seq++)))
goto nla_put_failure;
/* global sequence number */
if ((inst->flags & NFULNL_CFG_F_SEQ_GLOBAL) &&
nla_put_be32(inst->skb, NFULA_SEQ_GLOBAL,
htonl(atomic_inc_return(&log->global_seq))))
goto nla_put_failure;
if (ct && nfnl_ct->build(inst->skb, ct, ctinfo,
NFULA_CT, NFULA_CT_INFO) < 0)
goto nla_put_failure;
if (data_len) {
struct nlattr *nla;
int size = nla_attr_size(data_len);
if (skb_tailroom(inst->skb) < nla_total_size(data_len))
goto nla_put_failure;
nla = skb_put(inst->skb, nla_total_size(data_len));
nla->nla_type = NFULA_PAYLOAD;
nla->nla_len = size;
if (skb_copy_bits(skb, 0, nla_data(nla), data_len))
BUG();
}
nlh->nlmsg_len = inst->skb->tail - old_tail;
return 0;
nla_put_failure:
PRINTR(KERN_ERR "nfnetlink_log: error creating log nlmsg\n");
return -1;
}
static const struct nf_loginfo default_loginfo = {
.type = NF_LOG_TYPE_ULOG,
.u = {
.ulog = {
.copy_len = 0xffff,
.group = 0,
.qthreshold = 1,
},
},
};
/* log handler for internal netfilter logging api */
void
nfulnl_log_packet(struct net *net,
u_int8_t pf,
unsigned int hooknum,
const struct sk_buff *skb,
const struct net_device *in,
const struct net_device *out,
const struct nf_loginfo *li_user,
const char *prefix)
{
size_t size;
unsigned int data_len;
struct nfulnl_instance *inst;
const struct nf_loginfo *li;
unsigned int qthreshold;
unsigned int plen;
struct nfnl_log_net *log = nfnl_log_pernet(net);
const struct nfnl_ct_hook *nfnl_ct = NULL;
struct nf_conn *ct = NULL;
enum ip_conntrack_info uninitialized_var(ctinfo);
if (li_user && li_user->type == NF_LOG_TYPE_ULOG)
li = li_user;
else
li = &default_loginfo;
inst = instance_lookup_get(log, li->u.ulog.group);
if (!inst)
return;
plen = 0;
if (prefix)
plen = strlen(prefix) + 1;
/* FIXME: do we want to make the size calculation conditional based on
* what is actually present? way more branches and checks, but more
* memory efficient... */
size = nlmsg_total_size(sizeof(struct nfgenmsg))
+ nla_total_size(sizeof(struct nfulnl_msg_packet_hdr))
+ nla_total_size(sizeof(u_int32_t)) /* ifindex */
+ nla_total_size(sizeof(u_int32_t)) /* ifindex */
#if IS_ENABLED(CONFIG_BRIDGE_NETFILTER)
+ nla_total_size(sizeof(u_int32_t)) /* ifindex */
+ nla_total_size(sizeof(u_int32_t)) /* ifindex */
#endif
+ nla_total_size(sizeof(u_int32_t)) /* mark */
+ nla_total_size(sizeof(u_int32_t)) /* uid */
+ nla_total_size(sizeof(u_int32_t)) /* gid */
+ nla_total_size(plen) /* prefix */
+ nla_total_size(sizeof(struct nfulnl_msg_packet_hw))
+ nla_total_size(sizeof(struct nfulnl_msg_packet_timestamp))
+ nla_total_size(sizeof(struct nfgenmsg)); /* NLMSG_DONE */
if (in && skb_mac_header_was_set(skb)) {
size += nla_total_size(skb->dev->hard_header_len)
+ nla_total_size(sizeof(u_int16_t)) /* hwtype */
+ nla_total_size(sizeof(u_int16_t)); /* hwlen */
}
spin_lock_bh(&inst->lock);
if (inst->flags & NFULNL_CFG_F_SEQ)
size += nla_total_size(sizeof(u_int32_t));
if (inst->flags & NFULNL_CFG_F_SEQ_GLOBAL)
size += nla_total_size(sizeof(u_int32_t));
if (inst->flags & NFULNL_CFG_F_CONNTRACK) {
nfnl_ct = rcu_dereference(nfnl_ct_hook);
if (nfnl_ct != NULL) {
ct = nfnl_ct->get_ct(skb, &ctinfo);
if (ct != NULL)
size += nfnl_ct->build_size(ct);
}
}
qthreshold = inst->qthreshold;
/* per-rule qthreshold overrides per-instance */
if (li->u.ulog.qthreshold)
if (qthreshold > li->u.ulog.qthreshold)
qthreshold = li->u.ulog.qthreshold;
switch (inst->copy_mode) {
case NFULNL_COPY_META:
case NFULNL_COPY_NONE:
data_len = 0;
break;
case NFULNL_COPY_PACKET:
data_len = inst->copy_range;
if ((li->u.ulog.flags & NF_LOG_F_COPY_LEN) &&
(li->u.ulog.copy_len < data_len))
data_len = li->u.ulog.copy_len;
if (data_len > skb->len)
data_len = skb->len;
size += nla_total_size(data_len);
break;
case NFULNL_COPY_DISABLED:
default:
goto unlock_and_release;
}
if (inst->skb && size > skb_tailroom(inst->skb)) {
/* either the queue len is too high or we don't have
* enough room in the skb left. flush to userspace. */
__nfulnl_flush(inst);
}
if (!inst->skb) {
inst->skb = nfulnl_alloc_skb(net, inst->peer_portid,
inst->nlbufsiz, size);
if (!inst->skb)
goto alloc_failure;
}
inst->qlen++;
__build_packet_message(log, inst, skb, data_len, pf,
hooknum, in, out, prefix, plen,
nfnl_ct, ct, ctinfo);
if (inst->qlen >= qthreshold)
__nfulnl_flush(inst);
/* timer_pending always called within inst->lock, so there
* is no chance of a race here */
else if (!timer_pending(&inst->timer)) {
instance_get(inst);
inst->timer.expires = jiffies + (inst->flushtimeout*HZ/100);
add_timer(&inst->timer);
}
unlock_and_release:
spin_unlock_bh(&inst->lock);
instance_put(inst);
return;
alloc_failure:
/* FIXME: statistics */
goto unlock_and_release;
}
EXPORT_SYMBOL_GPL(nfulnl_log_packet);
static int
nfulnl_rcv_nl_event(struct notifier_block *this,
unsigned long event, void *ptr)
{
struct netlink_notify *n = ptr;
struct nfnl_log_net *log = nfnl_log_pernet(n->net);
if (event == NETLINK_URELEASE && n->protocol == NETLINK_NETFILTER) {
int i;
/* destroy all instances for this portid */
spin_lock_bh(&log->instances_lock);
for (i = 0; i < INSTANCE_BUCKETS; i++) {
struct hlist_node *t2;
struct nfulnl_instance *inst;
struct hlist_head *head = &log->instance_table[i];
hlist_for_each_entry_safe(inst, t2, head, hlist) {
if (n->portid == inst->peer_portid)
__instance_destroy(inst);
}
}
spin_unlock_bh(&log->instances_lock);
}
return NOTIFY_DONE;
}
static struct notifier_block nfulnl_rtnl_notifier = {
.notifier_call = nfulnl_rcv_nl_event,
};
static int nfulnl_recv_unsupp(struct net *net, struct sock *ctnl,
struct sk_buff *skb, const struct nlmsghdr *nlh,
const struct nlattr * const nfqa[],
struct netlink_ext_ack *extack)
{
return -ENOTSUPP;
}
static struct nf_logger nfulnl_logger __read_mostly = {
.name = "nfnetlink_log",
.type = NF_LOG_TYPE_ULOG,
.logfn = nfulnl_log_packet,
.me = THIS_MODULE,
};
static const struct nla_policy nfula_cfg_policy[NFULA_CFG_MAX+1] = {
[NFULA_CFG_CMD] = { .len = sizeof(struct nfulnl_msg_config_cmd) },
[NFULA_CFG_MODE] = { .len = sizeof(struct nfulnl_msg_config_mode) },
[NFULA_CFG_TIMEOUT] = { .type = NLA_U32 },
[NFULA_CFG_QTHRESH] = { .type = NLA_U32 },
[NFULA_CFG_NLBUFSIZ] = { .type = NLA_U32 },
[NFULA_CFG_FLAGS] = { .type = NLA_U16 },
};
static int nfulnl_recv_config(struct net *net, struct sock *ctnl,
struct sk_buff *skb, const struct nlmsghdr *nlh,
const struct nlattr * const nfula[],
struct netlink_ext_ack *extack)
{
struct nfgenmsg *nfmsg = nlmsg_data(nlh);
u_int16_t group_num = ntohs(nfmsg->res_id);
struct nfulnl_instance *inst;
struct nfulnl_msg_config_cmd *cmd = NULL;
struct nfnl_log_net *log = nfnl_log_pernet(net);
int ret = 0;
u16 flags = 0;
if (nfula[NFULA_CFG_CMD]) {
u_int8_t pf = nfmsg->nfgen_family;
cmd = nla_data(nfula[NFULA_CFG_CMD]);
/* Commands without queue context */
switch (cmd->command) {
case NFULNL_CFG_CMD_PF_BIND:
return nf_log_bind_pf(net, pf, &nfulnl_logger);
case NFULNL_CFG_CMD_PF_UNBIND:
nf_log_unbind_pf(net, pf);
return 0;
}
}
inst = instance_lookup_get(log, group_num);
if (inst && inst->peer_portid != NETLINK_CB(skb).portid) {
ret = -EPERM;
goto out_put;
}
/* Check if we support these flags in first place, dependencies should
* be there too not to break atomicity.
*/
if (nfula[NFULA_CFG_FLAGS]) {
flags = ntohs(nla_get_be16(nfula[NFULA_CFG_FLAGS]));
if ((flags & NFULNL_CFG_F_CONNTRACK) &&
!rcu_access_pointer(nfnl_ct_hook)) {
#ifdef CONFIG_MODULES
nfnl_unlock(NFNL_SUBSYS_ULOG);
request_module("ip_conntrack_netlink");
nfnl_lock(NFNL_SUBSYS_ULOG);
if (rcu_access_pointer(nfnl_ct_hook)) {
ret = -EAGAIN;
goto out_put;
}
#endif
ret = -EOPNOTSUPP;
goto out_put;
}
}
if (cmd != NULL) {
switch (cmd->command) {
case NFULNL_CFG_CMD_BIND:
if (inst) {
ret = -EBUSY;
goto out_put;
}
inst = instance_create(net, group_num,
NETLINK_CB(skb).portid,
sk_user_ns(NETLINK_CB(skb).sk));
if (IS_ERR(inst)) {
ret = PTR_ERR(inst);
goto out;
}
break;
case NFULNL_CFG_CMD_UNBIND:
if (!inst) {
ret = -ENODEV;
goto out;
}
instance_destroy(log, inst);
goto out_put;
default:
ret = -ENOTSUPP;
goto out_put;
}
} else if (!inst) {
ret = -ENODEV;
goto out;
}
if (nfula[NFULA_CFG_MODE]) {
struct nfulnl_msg_config_mode *params =
nla_data(nfula[NFULA_CFG_MODE]);
nfulnl_set_mode(inst, params->copy_mode,
ntohl(params->copy_range));
}
if (nfula[NFULA_CFG_TIMEOUT]) {
__be32 timeout = nla_get_be32(nfula[NFULA_CFG_TIMEOUT]);
nfulnl_set_timeout(inst, ntohl(timeout));
}
if (nfula[NFULA_CFG_NLBUFSIZ]) {
__be32 nlbufsiz = nla_get_be32(nfula[NFULA_CFG_NLBUFSIZ]);
nfulnl_set_nlbufsiz(inst, ntohl(nlbufsiz));
}
if (nfula[NFULA_CFG_QTHRESH]) {
__be32 qthresh = nla_get_be32(nfula[NFULA_CFG_QTHRESH]);
nfulnl_set_qthresh(inst, ntohl(qthresh));
}
if (nfula[NFULA_CFG_FLAGS])
nfulnl_set_flags(inst, flags);
out_put:
instance_put(inst);
out:
return ret;
}
static const struct nfnl_callback nfulnl_cb[NFULNL_MSG_MAX] = {
[NFULNL_MSG_PACKET] = { .call = nfulnl_recv_unsupp,
.attr_count = NFULA_MAX, },
[NFULNL_MSG_CONFIG] = { .call = nfulnl_recv_config,
.attr_count = NFULA_CFG_MAX,
.policy = nfula_cfg_policy },
};
static const struct nfnetlink_subsystem nfulnl_subsys = {
.name = "log",
.subsys_id = NFNL_SUBSYS_ULOG,
.cb_count = NFULNL_MSG_MAX,
.cb = nfulnl_cb,
};
#ifdef CONFIG_PROC_FS
struct iter_state {
struct seq_net_private p;
unsigned int bucket;
};
static struct hlist_node *get_first(struct net *net, struct iter_state *st)
{
struct nfnl_log_net *log;
if (!st)
return NULL;
log = nfnl_log_pernet(net);
for (st->bucket = 0; st->bucket < INSTANCE_BUCKETS; st->bucket++) {
struct hlist_head *head = &log->instance_table[st->bucket];
if (!hlist_empty(head))
return rcu_dereference_bh(hlist_first_rcu(head));
}
return NULL;
}
static struct hlist_node *get_next(struct net *net, struct iter_state *st,
struct hlist_node *h)
{
h = rcu_dereference_bh(hlist_next_rcu(h));
while (!h) {
struct nfnl_log_net *log;
struct hlist_head *head;
if (++st->bucket >= INSTANCE_BUCKETS)
return NULL;
log = nfnl_log_pernet(net);
head = &log->instance_table[st->bucket];
h = rcu_dereference_bh(hlist_first_rcu(head));
}
return h;
}
static struct hlist_node *get_idx(struct net *net, struct iter_state *st,
loff_t pos)
{
struct hlist_node *head;
head = get_first(net, st);
if (head)
while (pos && (head = get_next(net, st, head)))
pos--;
return pos ? NULL : head;
}
static void *seq_start(struct seq_file *s, loff_t *pos)
__acquires(rcu_bh)
{
rcu_read_lock_bh();
return get_idx(seq_file_net(s), s->private, *pos);
}
static void *seq_next(struct seq_file *s, void *v, loff_t *pos)
{
(*pos)++;
return get_next(seq_file_net(s), s->private, v);
}
static void seq_stop(struct seq_file *s, void *v)
__releases(rcu_bh)
{
rcu_read_unlock_bh();
}
static int seq_show(struct seq_file *s, void *v)
{
const struct nfulnl_instance *inst = v;
seq_printf(s, "%5u %6u %5u %1u %5u %6u %2u\n",
inst->group_num,
inst->peer_portid, inst->qlen,
inst->copy_mode, inst->copy_range,
inst->flushtimeout, refcount_read(&inst->use));
return 0;
}
static const struct seq_operations nful_seq_ops = {
.start = seq_start,
.next = seq_next,
.stop = seq_stop,
.show = seq_show,
};
static int nful_open(struct inode *inode, struct file *file)
{
return seq_open_net(inode, file, &nful_seq_ops,
sizeof(struct iter_state));
}
static const struct file_operations nful_file_ops = {
.owner = THIS_MODULE,
.open = nful_open,
.read = seq_read,
.llseek = seq_lseek,
.release = seq_release_net,
};
#endif /* PROC_FS */
static int __net_init nfnl_log_net_init(struct net *net)
{
unsigned int i;
struct nfnl_log_net *log = nfnl_log_pernet(net);
#ifdef CONFIG_PROC_FS
struct proc_dir_entry *proc;
kuid_t root_uid;
kgid_t root_gid;
#endif
for (i = 0; i < INSTANCE_BUCKETS; i++)
INIT_HLIST_HEAD(&log->instance_table[i]);
spin_lock_init(&log->instances_lock);
#ifdef CONFIG_PROC_FS
proc = proc_create("nfnetlink_log", 0440,
net->nf.proc_netfilter, &nful_file_ops);
if (!proc)
return -ENOMEM;
root_uid = make_kuid(net->user_ns, 0);
root_gid = make_kgid(net->user_ns, 0);
if (uid_valid(root_uid) && gid_valid(root_gid))
proc_set_user(proc, root_uid, root_gid);
#endif
return 0;
}
static void __net_exit nfnl_log_net_exit(struct net *net)
{
#ifdef CONFIG_PROC_FS
remove_proc_entry("nfnetlink_log", net->nf.proc_netfilter);
#endif
nf_log_unset(net, &nfulnl_logger);
}
static struct pernet_operations nfnl_log_net_ops = {
.init = nfnl_log_net_init,
.exit = nfnl_log_net_exit,
.id = &nfnl_log_net_id,
.size = sizeof(struct nfnl_log_net),
};
static int __init nfnetlink_log_init(void)
{
int status;
status = register_pernet_subsys(&nfnl_log_net_ops);
if (status < 0) {
pr_err("failed to register pernet ops\n");
goto out;
}
netlink_register_notifier(&nfulnl_rtnl_notifier);
status = nfnetlink_subsys_register(&nfulnl_subsys);
if (status < 0) {
pr_err("failed to create netlink socket\n");
goto cleanup_netlink_notifier;
}
status = nf_log_register(NFPROTO_UNSPEC, &nfulnl_logger);
if (status < 0) {
pr_err("failed to register logger\n");
goto cleanup_subsys;
}
return status;
cleanup_subsys:
nfnetlink_subsys_unregister(&nfulnl_subsys);
cleanup_netlink_notifier:
netlink_unregister_notifier(&nfulnl_rtnl_notifier);
unregister_pernet_subsys(&nfnl_log_net_ops);
out:
return status;
}
static void __exit nfnetlink_log_fini(void)
{
nfnetlink_subsys_unregister(&nfulnl_subsys);
netlink_unregister_notifier(&nfulnl_rtnl_notifier);
unregister_pernet_subsys(&nfnl_log_net_ops);
nf_log_unregister(&nfulnl_logger);
}
MODULE_DESCRIPTION("netfilter userspace logging");
MODULE_AUTHOR("Harald Welte <laforge@netfilter.org>");
MODULE_LICENSE("GPL");
MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_ULOG);
MODULE_ALIAS_NF_LOGGER(AF_INET, 1);
MODULE_ALIAS_NF_LOGGER(AF_INET6, 1);
MODULE_ALIAS_NF_LOGGER(AF_BRIDGE, 1);
MODULE_ALIAS_NF_LOGGER(3, 1); /* NFPROTO_ARP */
MODULE_ALIAS_NF_LOGGER(5, 1); /* NFPROTO_NETDEV */
module_init(nfnetlink_log_init);
module_exit(nfnetlink_log_fini);
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