Exemplo n.º 1
0
static int __init socket_mt_init(void)
{
	nf_defrag_ipv4_enable();
#ifdef XT_SOCKET_HAVE_IPV6
	nf_defrag_ipv6_enable();
#endif
	return xt_register_matches(socket_mt_reg, ARRAY_SIZE(socket_mt_reg));
}
Exemplo n.º 2
0
static int __init socket_mt_init(void)
{
	nf_defrag_ipv4_enable();
#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
	nf_defrag_ipv6_enable();
#endif

	return xt_register_matches(socket_mt_reg, ARRAY_SIZE(socket_mt_reg));
}
Exemplo n.º 3
0
static int nf_ct_netns_do_get(struct net *net, u8 nfproto)
{
	struct nf_conntrack_net *cnet = net_generic(net, nf_conntrack_net_id);
	int err = 0;

	mutex_lock(&nf_ct_proto_mutex);

	switch (nfproto) {
	case NFPROTO_IPV4:
		cnet->users4++;
		if (cnet->users4 > 1)
			goto out_unlock;
		err = nf_defrag_ipv4_enable(net);
		if (err) {
			cnet->users4 = 0;
			goto out_unlock;
		}

		err = nf_register_net_hooks(net, ipv4_conntrack_ops,
					    ARRAY_SIZE(ipv4_conntrack_ops));
		if (err)
			cnet->users4 = 0;
		break;
#if IS_ENABLED(CONFIG_IPV6)
	case NFPROTO_IPV6:
		cnet->users6++;
		if (cnet->users6 > 1)
			goto out_unlock;
		err = nf_defrag_ipv6_enable(net);
		if (err < 0) {
			cnet->users6 = 0;
			goto out_unlock;
		}

		err = nf_register_net_hooks(net, ipv6_conntrack_ops,
					    ARRAY_SIZE(ipv6_conntrack_ops));
		if (err)
			cnet->users6 = 0;
		break;
#endif
	default:
		err = -EPROTO;
		break;
	}
 out_unlock:
	mutex_unlock(&nf_ct_proto_mutex);
	return err;
}
Exemplo n.º 4
0
static int tproxy_tg4_check(const struct xt_tgchk_param *par)
{
	const struct ipt_ip *i = par->entryinfo;
	int err;

	err = nf_defrag_ipv4_enable(par->net);
	if (err)
		return err;

	if ((i->proto == IPPROTO_TCP || i->proto == IPPROTO_UDP)
	    && !(i->invflags & IPT_INV_PROTO))
		return 0;

	pr_info_ratelimited("Can be used only with -p tcp or -p udp\n");
	return -EINVAL;
}
static int __init nf_conntrack_l3proto_ipv4_init(void)
{
	int ret = 0;

	need_conntrack();
	nf_defrag_ipv4_enable();

	ret = nf_register_sockopt(&so_getorigdst);
	if (ret < 0) {
		printk(KERN_ERR "Unable to register netfilter socket option\n");
		return ret;
	}

	ret = register_pernet_subsys(&ipv4_net_ops);
	if (ret < 0) {
		pr_err("nf_conntrack_ipv4: can't register pernet ops\n");
		goto cleanup_sockopt;
	}

	ret = nf_register_hooks(ipv4_conntrack_ops,
				ARRAY_SIZE(ipv4_conntrack_ops));
	if (ret < 0) {
		pr_err("nf_conntrack_ipv4: can't register hooks.\n");
		goto cleanup_pernet;
	}
#if defined(CONFIG_PROC_FS) && defined(CONFIG_NF_CONNTRACK_PROC_COMPAT)
	ret = nf_conntrack_ipv4_compat_init();
	if (ret < 0)
		goto cleanup_hooks;
#endif
	return ret;
#if defined(CONFIG_PROC_FS) && defined(CONFIG_NF_CONNTRACK_PROC_COMPAT)
 cleanup_hooks:
	nf_unregister_hooks(ipv4_conntrack_ops, ARRAY_SIZE(ipv4_conntrack_ops));
#endif
 cleanup_pernet:
	unregister_pernet_subsys(&ipv4_net_ops);
 cleanup_sockopt:
	nf_unregister_sockopt(&so_getorigdst);
	return ret;
}
Exemplo n.º 6
0
static int __init nf_conntrack_l3proto_ipv4_init(void)
{
	int ret = 0;

	need_conntrack();
	nf_defrag_ipv4_enable();

	ret = nf_register_sockopt(&so_getorigdst);
	if (ret < 0) {
		printk(KERN_ERR "Unable to register netfilter socket option\n");
		return ret;
	}

	ret = nf_conntrack_l4proto_register(&nf_conntrack_l4proto_tcp4);
	if (ret < 0) {
		printk("nf_conntrack_ipv4: can't register tcp.\n");
		goto cleanup_sockopt;
	}

	ret = nf_conntrack_l4proto_register(&nf_conntrack_l4proto_udp4);
	if (ret < 0) {
		printk("nf_conntrack_ipv4: can't register udp.\n");
		goto cleanup_tcp;
	}

	ret = nf_conntrack_l4proto_register(&nf_conntrack_l4proto_icmp);
	if (ret < 0) {
		printk("nf_conntrack_ipv4: can't register icmp.\n");
		goto cleanup_udp;
	}

	ret = nf_conntrack_l3proto_register(&nf_conntrack_l3proto_ipv4);
	if (ret < 0) {
		printk("nf_conntrack_ipv4: can't register ipv4\n");
		goto cleanup_icmp;
	}

	ret = nf_register_hooks(ipv4_conntrack_ops,
				ARRAY_SIZE(ipv4_conntrack_ops));
	if (ret < 0) {
		printk("nf_conntrack_ipv4: can't register hooks.\n");
		goto cleanup_ipv4;
	}
#if defined(CONFIG_PROC_FS) && defined(CONFIG_NF_CONNTRACK_PROC_COMPAT)
	ret = nf_conntrack_ipv4_compat_init();
	if (ret < 0)
		goto cleanup_hooks;
#endif
	return ret;
#if defined(CONFIG_PROC_FS) && defined(CONFIG_NF_CONNTRACK_PROC_COMPAT)
 cleanup_hooks:
	nf_unregister_hooks(ipv4_conntrack_ops, ARRAY_SIZE(ipv4_conntrack_ops));
#endif
 cleanup_ipv4:
	nf_conntrack_l3proto_unregister(&nf_conntrack_l3proto_ipv4);
 cleanup_icmp:
	nf_conntrack_l4proto_unregister(&nf_conntrack_l4proto_icmp);
 cleanup_udp:
	nf_conntrack_l4proto_unregister(&nf_conntrack_l4proto_udp4);
 cleanup_tcp:
	nf_conntrack_l4proto_unregister(&nf_conntrack_l4proto_tcp4);
 cleanup_sockopt:
	nf_unregister_sockopt(&so_getorigdst);
	return ret;
}
Exemplo n.º 7
0
static bool
socket_mt4_v0(const struct sk_buff *skb, struct xt_action_param *par)
{
	static struct xt_socket_mtinfo1 xt_info_v0 = {
		.flags = 0,
	};

	return socket_match(skb, par, &xt_info_v0);
}

static bool
socket_mt4_v1_v2_v3(const struct sk_buff *skb, struct xt_action_param *par)
{
	return socket_match(skb, par, par->matchinfo);
}

#if IS_ENABLED(CONFIG_IP6_NF_IPTABLES)
static bool
socket_mt6_v1_v2_v3(const struct sk_buff *skb, struct xt_action_param *par)
{
	const struct xt_socket_mtinfo1 *info = (struct xt_socket_mtinfo1 *) par->matchinfo;
	struct sk_buff *pskb = (struct sk_buff *)skb;
	struct sock *sk = skb->sk;

	if (sk && !net_eq(xt_net(par), sock_net(sk)))
		sk = NULL;

	if (!sk)
		sk = nf_sk_lookup_slow_v6(xt_net(par), skb, xt_in(par));

	if (sk) {
		bool wildcard;
		bool transparent = true;

		/* Ignore sockets listening on INADDR_ANY
		 * unless XT_SOCKET_NOWILDCARD is set
		 */
		wildcard = (!(info->flags & XT_SOCKET_NOWILDCARD) &&
			    sk_fullsock(sk) &&
			    ipv6_addr_any(&sk->sk_v6_rcv_saddr));

		/* Ignore non-transparent sockets,
		 * if XT_SOCKET_TRANSPARENT is used
		 */
		if (info->flags & XT_SOCKET_TRANSPARENT)
			transparent = inet_sk_transparent(sk);

		if (info->flags & XT_SOCKET_RESTORESKMARK && !wildcard &&
		    transparent && sk_fullsock(sk))
			pskb->mark = sk->sk_mark;

		if (sk != skb->sk)
			sock_gen_put(sk);

		if (wildcard || !transparent)
			sk = NULL;
	}

	return sk != NULL;
}
#endif

static int socket_mt_enable_defrag(struct net *net, int family)
{
	switch (family) {
	case NFPROTO_IPV4:
		return nf_defrag_ipv4_enable(net);
#if IS_ENABLED(CONFIG_IP6_NF_IPTABLES)
	case NFPROTO_IPV6:
		return nf_defrag_ipv6_enable(net);
#endif
	}
	WARN_ONCE(1, "Unknown family %d\n", family);
	return 0;
}

static int socket_mt_v1_check(const struct xt_mtchk_param *par)
{
	const struct xt_socket_mtinfo1 *info = (struct xt_socket_mtinfo1 *) par->matchinfo;
	int err;

	err = socket_mt_enable_defrag(par->net, par->family);
	if (err)
		return err;

	if (info->flags & ~XT_SOCKET_FLAGS_V1) {
		pr_info_ratelimited("unknown flags 0x%x\n",
				    info->flags & ~XT_SOCKET_FLAGS_V1);
		return -EINVAL;
	}
	return 0;
}

static int socket_mt_v2_check(const struct xt_mtchk_param *par)
{
	const struct xt_socket_mtinfo2 *info = (struct xt_socket_mtinfo2 *) par->matchinfo;
	int err;

	err = socket_mt_enable_defrag(par->net, par->family);
	if (err)
		return err;

	if (info->flags & ~XT_SOCKET_FLAGS_V2) {
		pr_info_ratelimited("unknown flags 0x%x\n",
				    info->flags & ~XT_SOCKET_FLAGS_V2);
		return -EINVAL;
	}
	return 0;
}

static int socket_mt_v3_check(const struct xt_mtchk_param *par)
{
	const struct xt_socket_mtinfo3 *info =
				    (struct xt_socket_mtinfo3 *)par->matchinfo;
	int err;

	err = socket_mt_enable_defrag(par->net, par->family);
	if (err)
		return err;
	if (info->flags & ~XT_SOCKET_FLAGS_V3) {
		pr_info_ratelimited("unknown flags 0x%x\n",
				    info->flags & ~XT_SOCKET_FLAGS_V3);
		return -EINVAL;
	}
	return 0;
}

static struct xt_match socket_mt_reg[] __read_mostly = {
	{
		.name		= "socket",
		.revision	= 0,
		.family		= NFPROTO_IPV4,
		.match		= socket_mt4_v0,
		.hooks		= (1 << NF_INET_PRE_ROUTING) |
				  (1 << NF_INET_LOCAL_IN),
		.me		= THIS_MODULE,
	},
	{
		.name		= "socket",
		.revision	= 1,
		.family		= NFPROTO_IPV4,
		.match		= socket_mt4_v1_v2_v3,
		.checkentry	= socket_mt_v1_check,
		.matchsize	= sizeof(struct xt_socket_mtinfo1),
		.hooks		= (1 << NF_INET_PRE_ROUTING) |
				  (1 << NF_INET_LOCAL_IN),
		.me		= THIS_MODULE,
	},
#if IS_ENABLED(CONFIG_IP6_NF_IPTABLES)
	{
		.name		= "socket",
Exemplo n.º 8
0
static int __init tproxy_tg_init(void)
{
	nf_defrag_ipv4_enable();
	return xt_register_target(&tproxy_tg_reg);
}