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https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
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e14575fa75
Sparse complains about direct access to the 'helper' and timeout members. Both have __rcu annotation, so use the accessors. xt_CT is fine, accesses occur before the structure is visible to other cpus. Switch to rcu accessors there as well to reduce noise. Signed-off-by: Florian Westphal <fw@strlen.de> Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
146 lines
3.5 KiB
C
146 lines
3.5 KiB
C
// 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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const struct nf_ct_timeout_hooks __rcu *nf_ct_timeout_hook __read_mostly;
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EXPORT_SYMBOL_GPL(nf_ct_timeout_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) {
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const struct nf_ct_timeout *t;
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t = rcu_access_pointer(timeout_ext->timeout);
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if (!timeout || t == timeout)
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RCU_INIT_POINTER(timeout_ext->timeout, NULL);
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}
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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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struct nf_ct_iter_data iter_data = {
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.net = net,
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.data = timeout,
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};
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nf_ct_iterate_cleanup_net(untimeout, &iter_data);
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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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const struct nf_ct_timeout_hooks *h = rcu_dereference(nf_ct_timeout_hook);
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if (h)
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h->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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const struct nf_ct_timeout_hooks *h;
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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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h = rcu_dereference(nf_ct_timeout_hook);
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if (!h) {
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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 = h->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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const struct nf_ct_timeout_hooks *h;
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rcu_read_lock();
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h = rcu_dereference(nf_ct_timeout_hook);
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if (h) {
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timeout_ext = nf_ct_timeout_find(ct);
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if (timeout_ext) {
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struct nf_ct_timeout *t;
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t = rcu_dereference(timeout_ext->timeout);
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if (t)
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h->timeout_put(t);
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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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