Release 4.14 net/netfilter/nf_conntrack_proto.c

/* L3/L4 protocol support for nf_conntrack. */

/* (C) 1999-2001 Paul `Rusty' Russell
 * (C) 2002-2006 Netfilter Core Team <coreteam@netfilter.org>
 * (C) 2003,2004 USAGI/WIDE Project <http://www.linux-ipv6.org>
 * (C) 2006-2012 Patrick McHardy <kaber@trash.net>
 *
 * 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 <linux/types.h>
#include <linux/netfilter.h>
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/mutex.h>
#include <linux/vmalloc.h>
#include <linux/stddef.h>
#include <linux/err.h>
#include <linux/percpu.h>
#include <linux/notifier.h>
#include <linux/kernel.h>
#include <linux/netdevice.h>

#include <net/netfilter/nf_conntrack.h>
#include <net/netfilter/nf_conntrack_l3proto.h>
#include <net/netfilter/nf_conntrack_l4proto.h>
#include <net/netfilter/nf_conntrack_core.h>


static struct nf_conntrack_l4proto __rcu **nf_ct_protos[NFPROTO_NUMPROTO] __read_mostly;

struct nf_conntrack_l3proto __rcu *nf_ct_l3protos[NFPROTO_NUMPROTO] __read_mostly;

EXPORT_SYMBOL_GPL(nf_ct_l3protos);

static DEFINE_MUTEX(nf_ct_proto_mutex);

#ifdef CONFIG_SYSCTL

static int

nf_ct_register_sysctl(struct net *net,
		      struct ctl_table_header **header,
		      const char *path,
		      struct ctl_table *table)
{
	if (*header == NULL) {
		*header = register_net_sysctl(net, path, table);
		if (*header == NULL)
			return -ENOMEM;
	}

	return 0;
}

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9.68%
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Eric W. Biedermann
4
6.45%
2
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static void

nf_ct_unregister_sysctl(struct ctl_table_header **header,
			struct ctl_table **table,
			unsigned int users)
{
	if (users > 0)
		return;

	unregister_net_sysctl_table(*header);
	kfree(*table);
	*header = NULL;
	*table = NULL;
}
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38
74.51%
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12
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Eric W. Biedermann
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#endif


const struct nf_conntrack_l4proto *

__nf_ct_l4proto_find(u_int16_t l3proto, u_int8_t l4proto)
{
	if (unlikely(l3proto >= NFPROTO_NUMPROTO || nf_ct_protos[l3proto] == NULL))
		return &nf_conntrack_l4proto_generic;

	return rcu_dereference(nf_ct_protos[l3proto][l4proto]);
}
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Martin Josefsson
41
89.13%
2
40.00%
Patrick McHardy
3
6.52%
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Florian Westphal
2
4.35%
2
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EXPORT_SYMBOL_GPL(__nf_ct_l4proto_find);

/* this is guaranteed to always return a valid protocol helper, since
 * it falls back to generic_protocol */

const struct nf_conntrack_l3proto *

nf_ct_l3proto_find_get(u_int16_t l3proto)
{
	struct nf_conntrack_l3proto *p;

	rcu_read_lock();
	p = __nf_ct_l3proto_find(l3proto);
	if (!try_module_get(p->me))
		p = &nf_conntrack_l3proto_generic;
	rcu_read_unlock();

	return p;
}
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Martin Josefsson
44
93.62%
2
50.00%
Patrick McHardy
2
4.26%
1
25.00%
Florian Westphal
1
2.13%
1
25.00%
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47
100.00%
4
100.00%


EXPORT_SYMBOL_GPL(nf_ct_l3proto_find_get);


int

nf_ct_l3proto_try_module_get(unsigned short l3proto)
{
	const struct nf_conntrack_l3proto *p;
	int ret;

retry:	p = nf_ct_l3proto_find_get(l3proto);
	if (p == &nf_conntrack_l3proto_generic) {
		ret = request_module("nf_conntrack-%d", l3proto);
		if (!ret)
			goto retry;

		return -EPROTOTYPE;
	}

	return 0;
}
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Martin Josefsson
56
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4
6.67%
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60
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3
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EXPORT_SYMBOL_GPL(nf_ct_l3proto_try_module_get);



void nf_ct_l3proto_module_put(unsigned short l3proto)
{
	struct nf_conntrack_l3proto *p;

	/* rcu_read_lock not necessary since the caller holds a reference, but
         * taken anyways to avoid lockdep warnings in __nf_ct_l3proto_find()
         */
	rcu_read_lock();
	p = __nf_ct_l3proto_find(l3proto);
	module_put(p->me);
	rcu_read_unlock();
}
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EXPORT_SYMBOL_GPL(nf_ct_l3proto_module_put);



int nf_ct_netns_get(struct net *net, u8 nfproto)
{
	const struct nf_conntrack_l3proto *l3proto;
	int ret;

	might_sleep();

	ret = nf_ct_l3proto_try_module_get(nfproto);
	if (ret < 0)
		return ret;

	/* we already have a reference, can't fail */
	rcu_read_lock();
	l3proto = __nf_ct_l3proto_find(nfproto);
	rcu_read_unlock();

	if (!l3proto->net_ns_get)
		return 0;

	ret = l3proto->net_ns_get(net);
	if (ret < 0)
		nf_ct_l3proto_module_put(nfproto);

	return ret;
}
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EXPORT_SYMBOL_GPL(nf_ct_netns_get);



void nf_ct_netns_put(struct net *net, u8 nfproto)
{
	const struct nf_conntrack_l3proto *l3proto;

	might_sleep();

	/* same as nf_conntrack_netns_get(), reference assumed */
	rcu_read_lock();
	l3proto = __nf_ct_l3proto_find(nfproto);
	rcu_read_unlock();

	if (WARN_ON(!l3proto))
		return;

	if (l3proto->net_ns_put)
		l3proto->net_ns_put(net);

	nf_ct_l3proto_module_put(nfproto);
}
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EXPORT_SYMBOL_GPL(nf_ct_netns_put);


const struct nf_conntrack_l4proto *

nf_ct_l4proto_find_get(u_int16_t l3num, u_int8_t l4num)
{
	const struct nf_conntrack_l4proto *p;

	rcu_read_lock();
	p = __nf_ct_l4proto_find(l3num, l4num);
	if (!try_module_get(p->me))
		p = &nf_conntrack_l4proto_generic;
	rcu_read_unlock();

	return p;
}
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Pablo Neira Ayuso
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EXPORT_SYMBOL_GPL(nf_ct_l4proto_find_get);



void nf_ct_l4proto_put(const struct nf_conntrack_l4proto *p)
{
	module_put(p->me);
}
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EXPORT_SYMBOL_GPL(nf_ct_l4proto_put);



static int kill_l3proto(struct nf_conn *i, void *data)
{
	return nf_ct_l3num(i) == ((const struct nf_conntrack_l3proto *)data)->l3proto;
}

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Patrick McHardy
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9.09%
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3.03%
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static int kill_l4proto(struct nf_conn *i, void *data)
{
	const struct nf_conntrack_l4proto *l4proto;
	l4proto = data;
	return nf_ct_protonum(i) == l4proto->l4proto &&
	       nf_ct_l3num(i) == l4proto->l3proto;
}

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Martin Josefsson
37
84.09%
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Patrick McHardy
6
13.64%
1
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Florian Westphal
1
2.27%
1
25.00%
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44
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100.00%



int nf_ct_l3proto_register(const struct nf_conntrack_l3proto *proto)
{
	int ret = 0;
	struct nf_conntrack_l3proto *old;

	if (proto->l3proto >= NFPROTO_NUMPROTO)
		return -EBUSY;
#if IS_ENABLED(CONFIG_NF_CT_NETLINK)
	if (proto->tuple_to_nlattr && proto->nla_size == 0)
		return -EINVAL;
#endif
	mutex_lock(&nf_ct_proto_mutex);
	old = rcu_dereference_protected(nf_ct_l3protos[proto->l3proto],
					lockdep_is_held(&nf_ct_proto_mutex));
	if (old != &nf_conntrack_l3proto_generic) {
		ret = -EBUSY;
		goto out_unlock;
	}

	rcu_assign_pointer(nf_ct_l3protos[proto->l3proto], proto);

out_unlock:
	mutex_unlock(&nf_ct_proto_mutex);
	return ret;

}
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Martin Josefsson
56
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Eric Dumazet
20
16.53%
1
8.33%
Patrick McHardy
18
14.88%
3
25.00%
Florian Westphal
13
10.74%
3
25.00%
Holger Eitzenberger
13
10.74%
1
8.33%
Gao Feng
1
0.83%
1
8.33%
Total
121
100.00%
12
100.00%


EXPORT_SYMBOL_GPL(nf_ct_l3proto_register);



void nf_ct_l3proto_unregister(const struct nf_conntrack_l3proto *proto)
{
	BUG_ON(proto->l3proto >= NFPROTO_NUMPROTO);

	mutex_lock(&nf_ct_proto_mutex);
	BUG_ON(rcu_dereference_protected(nf_ct_l3protos[proto->l3proto],
					 lockdep_is_held(&nf_ct_proto_mutex)
					 ) != proto);
	rcu_assign_pointer(nf_ct_l3protos[proto->l3proto],
			   &nf_conntrack_l3proto_generic);
	mutex_unlock(&nf_ct_proto_mutex);

	synchronize_rcu();
	/* Remove all contrack entries for this protocol */
	nf_ct_iterate_destroy(kill_l3proto, (void*)proto);
}
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Martin Josefsson
39
48.15%
3
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Patrick McHardy
17
20.99%
3
25.00%
Florian Westphal
14
17.28%
3
25.00%
Eric Dumazet
9
11.11%
1
8.33%
Gao Feng
2
2.47%
2
16.67%
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EXPORT_SYMBOL_GPL(nf_ct_l3proto_unregister);



static struct nf_proto_net *nf_ct_l4proto_net(struct net *net,
				const struct nf_conntrack_l4proto *l4proto)
{
	if (l4proto->get_net_proto) {
		/* statically built-in protocols use static per-net */
		return l4proto->get_net_proto(net);
	} else if (l4proto->net_id) {
		/* ... and loadable protocols use dynamic per-net */
		return net_generic(net, *l4proto->net_id);
	}
	return NULL;
}

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47
78.33%
4
57.14%
Pablo Neira Ayuso
11
18.33%
1
14.29%
Julia Lawall
1
1.67%
1
14.29%
Patrick McHardy
1
1.67%
1
14.29%
Total
60
100.00%
7
100.00%


static

int nf_ct_l4proto_register_sysctl(struct net *net,
				  struct nf_proto_net *pn,
				  const struct nf_conntrack_l4proto *l4proto)
{
	int err = 0;

#ifdef CONFIG_SYSCTL
	if (pn->ctl_table != NULL) {
		err = nf_ct_register_sysctl(net,
					    &pn->ctl_table_header,
					    "net/netfilter",
					    pn->ctl_table);
		if (err < 0) {
			if (!pn->users) {
				kfree(pn->ctl_table);
				pn->ctl_table = NULL;
			}
		}
	}
#endif /* CONFIG_SYSCTL */
	return err;
}

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54.26%
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42.86%
Gao Feng
41
43.62%
2
28.57%
Julia Lawall
1
1.06%
1
14.29%
Eric W. Biedermann
1
1.06%
1
14.29%
Total
94
100.00%
7
100.00%


static

void nf_ct_l4proto_unregister_sysctl(struct net *net,
				struct nf_proto_net *pn,
				const struct nf_conntrack_l4proto *l4proto)
{
#ifdef CONFIG_SYSCTL
	if (pn->ctl_table_header != NULL)
		nf_ct_unregister_sysctl(&pn->ctl_table_header,
					&pn->ctl_table,
					pn->users);
#endif /* CONFIG_SYSCTL */
}

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35
66.04%
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17
32.08%
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Julia Lawall
1
1.89%
1
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/* FIXME: Allow NULL functions and sub in pointers to generic for
   them. --RR */


int nf_ct_l4proto_register_one(struct nf_conntrack_l4proto *l4proto)
{
	int ret = 0;

	if (l4proto->l3proto >= ARRAY_SIZE(nf_ct_protos))
		return -EBUSY;

	if ((l4proto->to_nlattr && !l4proto->nlattr_size) ||
	    (l4proto->tuple_to_nlattr && !l4proto->nlattr_tuple_size))
		return -EINVAL;

	mutex_lock(&nf_ct_proto_mutex);
	if (!nf_ct_protos[l4proto->l3proto]) {
		/* l3proto may be loaded latter. */
		struct nf_conntrack_l4proto __rcu **proto_array;
		int i;

		proto_array = kmalloc(MAX_NF_CT_PROTO *
				      sizeof(struct nf_conntrack_l4proto *),
				      GFP_KERNEL);
		if (proto_array == NULL) {
			ret = -ENOMEM;
			goto out_unlock;
		}

		for (i = 0; i < MAX_NF_CT_PROTO; i++)
			RCU_INIT_POINTER(proto_array[i],
					 &nf_conntrack_l4proto_generic);

		/* Before making proto_array visible to lockless readers,
                 * we must make sure its content is committed to memory.
                 */
		smp_wmb();

		nf_ct_protos[l4proto->l3proto] = proto_array;
	} else if (rcu_dereference_protected(
			nf_ct_protos[l4proto->l3proto][l4proto->l4proto],
			lockdep_is_held(&nf_ct_proto_mutex)
			) != &nf_conntrack_l4proto_generic) {
		ret = -EBUSY;
		goto out_unlock;
	}

	l4proto->nla_size = 0;
	if (l4proto->nlattr_size)
		l4proto->nla_size += l4proto->nlattr_size();
	if (l4proto->nlattr_tuple_size)
		l4proto->nla_size += 3 * l4proto->nlattr_tuple_size();

	rcu_assign_pointer(nf_ct_protos[l4proto->l3proto][l4proto->l4proto],
			   l4proto);
out_unlock:
	mutex_unlock(&nf_ct_proto_mutex);
	return ret;
}
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23.08%
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66
25.48%
1
7.69%
Patrick McHardy
44
16.99%
4
30.77%
Eric Dumazet
18
6.95%
3
23.08%
Florian Westphal
4
1.54%
1
7.69%
Davide Caratti
1
0.39%
1
7.69%
Total
259
100.00%
13
100.00%


EXPORT_SYMBOL_GPL(nf_ct_l4proto_register_one);



int nf_ct_l4proto_pernet_register_one(struct net *net,
				const struct nf_conntrack_l4proto *l4proto)
{
	int ret = 0;
	struct nf_proto_net *pn = NULL;

	if (l4proto->init_net) {
		ret = l4proto->init_net(net, l4proto->l3proto);
		if (ret < 0)
			goto out;
	}

	pn = nf_ct_l4proto_net(net, l4proto);
	if (pn == NULL)
		goto out;

	ret = nf_ct_l4proto_register_sysctl(net, pn, l4proto);
	if (ret < 0)
		goto out;

	pn->users++;
out:
	return ret;
}
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104
98.11%
4
66.67%
Julia Lawall
1
0.94%
1
16.67%
Davide Caratti
1
0.94%
1
16.67%
Total
106
100.00%
6
100.00%


EXPORT_SYMBOL_GPL(nf_ct_l4proto_pernet_register_one);



static void __nf_ct_l4proto_unregister_one(const struct nf_conntrack_l4proto *l4proto)

{
	BUG_ON(l4proto->l3proto >= ARRAY_SIZE(nf_ct_protos));

	BUG_ON(rcu_dereference_protected(
			nf_ct_protos[l4proto->l3proto][l4proto->l4proto],
			lockdep_is_held(&nf_ct_proto_mutex)
			) != l4proto);
	rcu_assign_pointer(nf_ct_protos[l4proto->l3proto][l4proto->l4proto],
			   &nf_conntrack_l4proto_generic);
}

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41
60.29%
3
33.33%
Patrick McHardy
10
14.71%
2
22.22%
Eric Dumazet
9
13.24%
1
11.11%
Florian Westphal
7
10.29%
2
22.22%
Julia Lawall
1
1.47%
1
11.11%
Total
68
100.00%
9
100.00%



void nf_ct_l4proto_unregister_one(const struct nf_conntrack_l4proto *l4proto)
{
	mutex_lock(&nf_ct_proto_mutex);
	__nf_ct_l4proto_unregister_one(l4proto);
	mutex_unlock(&nf_ct_proto_mutex);

	synchronize_rcu();
}
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20
64.52%
1
16.67%
Patrick McHardy
5
16.13%
2
33.33%
Martin Josefsson
4
12.90%
1
16.67%
Julia Lawall
1
3.23%
1
16.67%
Gao Feng
1
3.23%
1
16.67%
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31
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6
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EXPORT_SYMBOL_GPL(nf_ct_l4proto_unregister_one);



void nf_ct_l4proto_pernet_unregister_one(struct net *net,
				const struct nf_conntrack_l4proto *l4proto)
{
	struct nf_proto_net *pn = nf_ct_l4proto_net(net, l4proto);

	if (pn == NULL)
		return;

	pn->users--;
	nf_ct_l4proto_unregister_sysctl(net, pn, l4proto);
}
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45
91.84%
2
33.33%
Davide Caratti
1
2.04%
1
16.67%
Martin Josefsson
1
2.04%
1
16.67%
Aaron Conole
1
2.04%
1
16.67%
Julia Lawall
1
2.04%
1
16.67%
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49
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6
100.00%


EXPORT_SYMBOL_GPL(nf_ct_l4proto_pernet_unregister_one);



int nf_ct_l4proto_register(struct nf_conntrack_l4proto *l4proto[],
			   unsigned int num_proto)
{
	int ret = -EINVAL, ver;
	unsigned int i;

	for (i = 0; i < num_proto; i++) {
		ret = nf_ct_l4proto_register_one(l4proto[i]);
		if (ret < 0)
			break;
	}
	if (i != num_proto) {
		ver = l4proto[i]->l3proto == PF_INET6 ? 6 : 4;
		pr_err("nf_conntrack_ipv%d: can't register l4 %d proto.\n",
		       ver, l4proto[i]->l4proto);
		nf_ct_l4proto_unregister(l4proto, i);
	}
	return ret;
}
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104
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1.89%
1
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106
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100.00%


EXPORT_SYMBOL_GPL(nf_ct_l4proto_register);



int nf_ct_l4proto_pernet_register(struct net *net,
				  struct nf_conntrack_l4proto *const l4proto[],
				  unsigned int num_proto)
{
	int ret = -EINVAL;
	unsigned int i;

	for (i = 0; i < num_proto; i++) {
		ret = nf_ct_l4proto_pernet_register_one(net, l4proto[i]);
		if (ret < 0)
			break;
	}
	if (i != num_proto) {
		pr_err("nf_conntrack_proto_%d %d: pernet registration failed\n",
		       l4proto[i]->l4proto,
		       l4proto[i]->l3proto == PF_INET6 ? 6 : 4);
		nf_ct_l4proto_pernet_unregister(net, l4proto, i);
	}
	return ret;
}
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97.27%
1
33.33%
Florian Westphal
2
1.82%
1
33.33%
Julia Lawall
1
0.91%
1
33.33%
Total
110
100.00%
3
100.00%


EXPORT_SYMBOL_GPL(nf_ct_l4proto_pernet_register);



void nf_ct_l4proto_unregister(struct nf_conntrack_l4proto *l4proto[],
			      unsigned int num_proto)
{
	mutex_lock(&nf_ct_proto_mutex);
	while (num_proto-- != 0)
		__nf_ct_l4proto_unregister_one(l4proto[num_proto]);
	mutex_unlock(&nf_ct_proto_mutex);

	synchronize_net();
	/* Remove all contrack entries for this protocol */
	nf_ct_iterate_destroy(kill_l4proto, l4proto);
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
Davide Caratti
29
54.72%
1
50.00%
Florian Westphal
24
45.28%
1
50.00%
Total
53
100.00%
2
100.00%


EXPORT_SYMBOL_GPL(nf_ct_l4proto_unregister);



void nf_ct_l4proto_pernet_unregister(struct net *net,
				struct nf_conntrack_l4proto *const l4proto[],
				unsigned int num_proto)
{
	while (num_proto-- != 0)
		nf_ct_l4proto_pernet_unregister_one(net, l4proto[num_proto]);
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
Davide Caratti
37
97.37%
1
50.00%
Julia Lawall
1
2.63%
1
50.00%
Total
38
100.00%
2
100.00%


EXPORT_SYMBOL_GPL(nf_ct_l4proto_pernet_unregister);



int nf_conntrack_proto_pernet_init(struct net *net)
{
	int err;
	struct nf_proto_net *pn = nf_ct_l4proto_net(net,
					&nf_conntrack_l4proto_generic);

	err = nf_conntrack_l4proto_generic.init_net(net,
					nf_conntrack_l4proto_generic.l3proto);
	if (err < 0)
		return err;
	err = nf_ct_l4proto_register_sysctl(net,
					    pn,
					    &nf_conntrack_l4proto_generic);
	if (err < 0)
		return err;

	pn->users++;
	return 0;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Gao Feng
50
64.94%
5
83.33%
Patrick McHardy
27
35.06%
1
16.67%
Total
77
100.00%
6
100.00%



void nf_conntrack_proto_pernet_fini(struct net *net)
{
	struct nf_proto_net *pn = nf_ct_l4proto_net(net,
					&nf_conntrack_l4proto_generic);

	pn->users--;
	nf_ct_l4proto_unregister_sysctl(net,
					pn,
					&nf_conntrack_l4proto_generic);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Gao Feng
29
76.32%
4
80.00%
Patrick McHardy
9
23.68%
1
20.00%
Total
38
100.00%
5
100.00%



int nf_conntrack_proto_init(void)
{
	unsigned int i;
	for (i = 0; i < NFPROTO_NUMPROTO; i++)
		rcu_assign_pointer(nf_ct_l3protos[i],
				   &nf_conntrack_l3proto_generic);
	return 0;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Gao Feng
37
97.37%
2
66.67%
Florian Westphal
1
2.63%
1
33.33%
Total
38
100.00%
3
100.00%



void nf_conntrack_proto_fini(void)
{
	unsigned int i;
	/* free l3proto protocol tables */
	for (i = 0; i < ARRAY_SIZE(nf_ct_protos); i++)
		kfree(nf_ct_protos[i]);
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
Patrick McHardy
22
61.11%
1
25.00%
Gao Feng
10
27.78%
2
50.00%
Florian Westphal
4
11.11%
1
25.00%
Total
36
100.00%
4
100.00%

Overall Contributors
Person
Tokens
Prop
Commits
CommitProp
Martin Josefsson
564
25.66%
3
6.25%
Gao Feng
421
19.15%
11
22.92%
Patrick McHardy
398
18.11%
13
27.08%
Davide Caratti
303
13.79%
1
2.08%
Florian Westphal
265
12.06%
7
14.58%
Pablo Neira Ayuso
89
4.05%
2
4.17%
Holger Eitzenberger
79
3.59%
1
2.08%
Eric Dumazet
56
2.55%
3
6.25%
Julia Lawall
10
0.45%
1
2.08%
Eric W. Biedermann
6
0.27%
2
4.17%
Tejun Heo
3
0.14%
1
2.08%
Arnd Bergmann
2
0.09%
1
2.08%
Aaron Conole
1
0.05%
1
2.08%
Adrian Bunk
1
0.05%
1
2.08%
Total
2198
100.00%
48
100.00%
Directory: net/netfilter

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