Release 4.11 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[PF_MAX] __read_mostly;

struct nf_conntrack_l3proto __rcu *nf_ct_l3protos[AF_MAX] __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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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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#endif


struct nf_conntrack_l4proto *

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

	return rcu_dereference(nf_ct_protos[l3proto][l4proto]);
}
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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 */

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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EXPORT_SYMBOL_GPL(nf_ct_l3proto_find_get);


int

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

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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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);


struct nf_conntrack_l4proto *

nf_ct_l4proto_find_get(u_int16_t l3num, u_int8_t l4num)
{
	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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EXPORT_SYMBOL_GPL(nf_ct_l4proto_find_get);



void nf_ct_l4proto_put(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) == ((struct nf_conntrack_l3proto *)data)->l3proto;
}

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

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

	if (proto->l3proto >= AF_MAX)
		return -EBUSY;

	if (proto->tuple_to_nlattr && !proto->nlattr_tuple_size)
		return -EINVAL;

	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;
	}

	if (proto->nlattr_tuple_size)
		proto->nla_size = 3 * proto->nlattr_tuple_size();

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

out_unlock:
	mutex_unlock(&nf_ct_proto_mutex);
	return ret;

}
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32
25.00%
1
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Eric Dumazet
20
15.62%
1
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Patrick McHardy
18
14.06%
3
33.33%
Gao Feng
1
0.78%
1
11.11%
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EXPORT_SYMBOL_GPL(nf_ct_l3proto_register);

#ifdef CONFIG_SYSCTL
extern unsigned int nf_conntrack_default_on;



int nf_ct_l3proto_pernet_register(struct net *net,
				  struct nf_conntrack_l3proto *proto)
{
	if (nf_conntrack_default_on == 0)
		return 0;

	return proto->net_ns_get ? proto->net_ns_get(net) : 0;
}
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EXPORT_SYMBOL_GPL(nf_ct_l3proto_pernet_register);
#endif



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

	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();
}
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13.24%
1
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Gao Feng
2
2.94%
2
22.22%
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EXPORT_SYMBOL_GPL(nf_ct_l3proto_unregister);



void nf_ct_l3proto_pernet_unregister(struct net *net,
				     struct nf_conntrack_l3proto *proto)
{
	/*
         * nf_conntrack_default_on *might* have registered hooks.
         * ->net_ns_put must cope with more puts() than get(), i.e.
         * if nf_conntrack_default_on was 0 at time of
         * nf_ct_l3proto_pernet_register invocation this net_ns_put()
         * should be a noop.
         */
	if (proto->net_ns_put)
		proto->net_ns_put(net);

	/* Remove all contrack entries for this protocol */
	nf_ct_iterate_cleanup(net, kill_l3proto, proto, 0, 0);
}
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14
32.56%
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Martin Josefsson
9
20.93%
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Alexey Dobriyan
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2
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EXPORT_SYMBOL_GPL(nf_ct_l3proto_pernet_unregister);



static struct nf_proto_net *nf_ct_l4proto_net(struct net *net,
					      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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static

int nf_ct_l4proto_register_sysctl(struct net *net,
				  struct nf_proto_net *pn,
				  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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33.33%
Eric W. Biedermann
1
1.08%
1
16.67%
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static

void nf_ct_l4proto_unregister_sysctl(struct net *net,
				     struct nf_proto_net *pn,
				     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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/* 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 >= PF_MAX)
		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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25.78%
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8.33%
Patrick McHardy
44
17.19%
4
33.33%
Eric Dumazet
18
7.03%
3
25.00%
Davide Caratti
1
0.39%
1
8.33%
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256
100.00%
12
100.00%


EXPORT_SYMBOL_GPL(nf_ct_l4proto_register_one);



int nf_ct_l4proto_pernet_register_one(struct net *net,
				      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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EXPORT_SYMBOL_GPL(nf_ct_l4proto_pernet_register_one);



void nf_ct_l4proto_unregister_one(struct nf_conntrack_l4proto *l4proto)
{
	BUG_ON(l4proto->l3proto >= PF_MAX);

	mutex_lock(&nf_ct_proto_mutex);
	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);
	mutex_unlock(&nf_ct_proto_mutex);

	synchronize_rcu();
}
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9
11.54%
1
11.11%
Davide Caratti
1
1.28%
1
11.11%
Gao Feng
1
1.28%
1
11.11%
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100.00%
9
100.00%


EXPORT_SYMBOL_GPL(nf_ct_l4proto_unregister_one);



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

	pn = nf_ct_l4proto_net(net, l4proto);
	if (pn == NULL)
		return;

	pn->users--;
	nf_ct_l4proto_unregister_sysctl(net, pn, l4proto);

	/* Remove all contrack entries for this protocol */
	nf_ct_iterate_cleanup(net, kill_l4proto, l4proto, 0, 0);
}
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13.64%
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4
6.06%
1
12.50%
Alexey Dobriyan
2
3.03%
2
25.00%
Davide Caratti
1
1.52%
1
12.50%
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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 %s%d proto.\n",
		       ver, l4proto[i]->name, ver);
		nf_ct_l4proto_unregister(l4proto, i);
	}
	return ret;
}
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EXPORT_SYMBOL_GPL(nf_ct_l4proto_register);



int nf_ct_l4proto_pernet_register(struct net *net,
				  struct nf_conntrack_l4proto *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_%s%d: pernet registration failed\n",
		       l4proto[i]->name,
		       l4proto[i]->l3proto == PF_INET6 ? 6 : 4);
		nf_ct_l4proto_pernet_unregister(net, l4proto, i);
	}
	return ret;
}
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Davide Caratti
109
100.00%
1
100.00%
Total
109
100.00%
1
100.00%


EXPORT_SYMBOL_GPL(nf_ct_l4proto_pernet_register);



void nf_ct_l4proto_unregister(struct nf_conntrack_l4proto *l4proto[],
			      unsigned int num_proto)
{
	while (num_proto-- != 0)
		nf_ct_l4proto_unregister_one(l4proto[num_proto]);
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
Davide Caratti
30
100.00%
1
100.00%
Total
30
100.00%
1
100.00%


EXPORT_SYMBOL_GPL(nf_ct_l4proto_unregister);



void nf_ct_l4proto_pernet_unregister(struct net *net,
				     struct nf_conntrack_l4proto *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
100.00%
1
100.00%
Total
37
100.00%
1
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 < AF_MAX; i++)
		rcu_assign_pointer(nf_ct_l3protos[i],
				   &nf_conntrack_l3proto_generic);
	return 0;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Gao Feng
38
100.00%
2
100.00%
Total
38
100.00%
2
100.00%



void nf_conntrack_proto_fini(void)
{
	unsigned int i;
	/* free l3proto protocol tables */
	for (i = 0; i < PF_MAX; i++)
		kfree(nf_ct_protos[i]);
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
Patrick McHardy
23
69.70%
1
33.33%
Gao Feng
10
30.30%
2
66.67%
Total
33
100.00%
3
100.00%

Overall Contributors
Person
Tokens
Prop
Commits
CommitProp
Martin Josefsson
600
26.63%
3
6.52%
Gao Feng
460
20.42%
11
23.91%
Patrick McHardy
409
18.15%
13
28.26%
Davide Caratti
311
13.80%
1
2.17%
Florian Westphal
213
9.45%
4
8.70%
Holger Eitzenberger
98
4.35%
1
2.17%
Pablo Neira Ayuso
90
3.99%
3
6.52%
Eric Dumazet
56
2.49%
3
6.52%
Eric W. Biedermann
6
0.27%
2
4.35%
Alexey Dobriyan
4
0.18%
2
4.35%
Tejun Heo
3
0.13%
1
2.17%
Arnd Bergmann
2
0.09%
1
2.17%
Adrian Bunk
1
0.04%
1
2.17%
Total
2253
100.00%
46
100.00%
Directory: net/netfilter

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