// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* (C) 2012 by Pablo Neira Ayuso <pablo@netfilter.org>
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* (C) 2012 by Vyatta Inc. <http://www.vyatta.com>
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*/
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#include <linux/types.h>
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#include <linux/netfilter.h>
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#include <linux/skbuff.h>
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#include <linux/vmalloc.h>
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#include <linux/stddef.h>
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#include <linux/err.h>
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#include <linux/percpu.h>
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#include <linux/kernel.h>
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#include <linux/netdevice.h>
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#include <linux/slab.h>
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#include <linux/export.h>
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#include <net/netfilter/nf_conntrack.h>
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#include <net/netfilter/nf_conntrack_core.h>
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#include <net/netfilter/nf_conntrack_extend.h>
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#include <net/netfilter/nf_conntrack_l4proto.h>
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#include <net/netfilter/nf_conntrack_timeout.h>
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struct nf_ct_timeout *
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(*nf_ct_timeout_find_get_hook)(struct net *net, const char *name) __read_mostly;
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EXPORT_SYMBOL_GPL(nf_ct_timeout_find_get_hook);
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void (*nf_ct_timeout_put_hook)(struct nf_ct_timeout *timeout) __read_mostly;
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EXPORT_SYMBOL_GPL(nf_ct_timeout_put_hook);
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static int untimeout(struct nf_conn *ct, void *timeout)
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{
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struct nf_conn_timeout *timeout_ext = nf_ct_timeout_find(ct);
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if (timeout_ext && (!timeout || timeout_ext->timeout == timeout))
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RCU_INIT_POINTER(timeout_ext->timeout, NULL);
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/* We are not intended to delete this conntrack. */
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return 0;
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}
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void nf_ct_untimeout(struct net *net, struct nf_ct_timeout *timeout)
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{
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nf_ct_iterate_cleanup_net(net, untimeout, timeout, 0, 0);
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}
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EXPORT_SYMBOL_GPL(nf_ct_untimeout);
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static void __nf_ct_timeout_put(struct nf_ct_timeout *timeout)
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{
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typeof(nf_ct_timeout_put_hook) timeout_put;
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timeout_put = rcu_dereference(nf_ct_timeout_put_hook);
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if (timeout_put)
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timeout_put(timeout);
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}
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int nf_ct_set_timeout(struct net *net, struct nf_conn *ct,
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u8 l3num, u8 l4num, const char *timeout_name)
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{
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typeof(nf_ct_timeout_find_get_hook) timeout_find_get;
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struct nf_ct_timeout *timeout;
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struct nf_conn_timeout *timeout_ext;
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const char *errmsg = NULL;
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int ret = 0;
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rcu_read_lock();
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timeout_find_get = rcu_dereference(nf_ct_timeout_find_get_hook);
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if (!timeout_find_get) {
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ret = -ENOENT;
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errmsg = "Timeout policy base is empty";
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goto out;
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}
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timeout = timeout_find_get(net, timeout_name);
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if (!timeout) {
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ret = -ENOENT;
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pr_info_ratelimited("No such timeout policy \"%s\"\n",
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timeout_name);
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goto out;
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}
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if (timeout->l3num != l3num) {
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ret = -EINVAL;
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pr_info_ratelimited("Timeout policy `%s' can only be used by "
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"L%d protocol number %d\n",
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timeout_name, 3, timeout->l3num);
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goto err_put_timeout;
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}
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/* Make sure the timeout policy matches any existing protocol tracker,
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* otherwise default to generic.
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*/
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if (timeout->l4proto->l4proto != l4num) {
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ret = -EINVAL;
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pr_info_ratelimited("Timeout policy `%s' can only be used by "
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"L%d protocol number %d\n",
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timeout_name, 4, timeout->l4proto->l4proto);
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goto err_put_timeout;
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}
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timeout_ext = nf_ct_timeout_ext_add(ct, timeout, GFP_ATOMIC);
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if (!timeout_ext) {
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ret = -ENOMEM;
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goto err_put_timeout;
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}
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rcu_read_unlock();
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return ret;
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err_put_timeout:
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__nf_ct_timeout_put(timeout);
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out:
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rcu_read_unlock();
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if (errmsg)
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pr_info_ratelimited("%s\n", errmsg);
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return ret;
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}
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EXPORT_SYMBOL_GPL(nf_ct_set_timeout);
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void nf_ct_destroy_timeout(struct nf_conn *ct)
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{
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struct nf_conn_timeout *timeout_ext;
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typeof(nf_ct_timeout_put_hook) timeout_put;
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rcu_read_lock();
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timeout_put = rcu_dereference(nf_ct_timeout_put_hook);
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if (timeout_put) {
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timeout_ext = nf_ct_timeout_find(ct);
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if (timeout_ext) {
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timeout_put(timeout_ext->timeout);
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RCU_INIT_POINTER(timeout_ext->timeout, NULL);
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}
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}
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rcu_read_unlock();
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}
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EXPORT_SYMBOL_GPL(nf_ct_destroy_timeout);
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static const struct nf_ct_ext_type timeout_extend = {
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.len = sizeof(struct nf_conn_timeout),
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.align = __alignof__(struct nf_conn_timeout),
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.id = NF_CT_EXT_TIMEOUT,
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};
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int nf_conntrack_timeout_init(void)
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{
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int ret = nf_ct_extend_register(&timeout_extend);
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if (ret < 0)
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pr_err("nf_ct_timeout: Unable to register timeout extension.\n");
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return ret;
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}
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void nf_conntrack_timeout_fini(void)
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{
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nf_ct_extend_unregister(&timeout_extend);
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}
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