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-rw-r--r--net/netfilter/nfnetlink_cttimeout.c681
1 files changed, 681 insertions, 0 deletions
diff --git a/net/netfilter/nfnetlink_cttimeout.c b/net/netfilter/nfnetlink_cttimeout.c
new file mode 100644
index 000000000..f466af4f8
--- /dev/null
+++ b/net/netfilter/nfnetlink_cttimeout.c
@@ -0,0 +1,681 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * (C) 2012 by Pablo Neira Ayuso <pablo@netfilter.org>
+ * (C) 2012 by Vyatta Inc. <http://www.vyatta.com>
+ */
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/rculist.h>
+#include <linux/rculist_nulls.h>
+#include <linux/types.h>
+#include <linux/timer.h>
+#include <linux/security.h>
+#include <linux/skbuff.h>
+#include <linux/errno.h>
+#include <linux/netlink.h>
+#include <linux/spinlock.h>
+#include <linux/interrupt.h>
+#include <linux/slab.h>
+
+#include <linux/netfilter.h>
+#include <net/netlink.h>
+#include <net/netns/generic.h>
+#include <net/sock.h>
+#include <net/netfilter/nf_conntrack.h>
+#include <net/netfilter/nf_conntrack_core.h>
+#include <net/netfilter/nf_conntrack_l4proto.h>
+#include <net/netfilter/nf_conntrack_tuple.h>
+#include <net/netfilter/nf_conntrack_timeout.h>
+
+#include <linux/netfilter/nfnetlink.h>
+#include <linux/netfilter/nfnetlink_cttimeout.h>
+
+static unsigned int nfct_timeout_id __read_mostly;
+
+struct ctnl_timeout {
+ struct list_head head;
+ struct list_head free_head;
+ struct rcu_head rcu_head;
+ refcount_t refcnt;
+ char name[CTNL_TIMEOUT_NAME_MAX];
+
+ /* must be at the end */
+ struct nf_ct_timeout timeout;
+};
+
+struct nfct_timeout_pernet {
+ struct list_head nfct_timeout_list;
+ struct list_head nfct_timeout_freelist;
+};
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Pablo Neira Ayuso <pablo@netfilter.org>");
+MODULE_DESCRIPTION("cttimeout: Extended Netfilter Connection Tracking timeout tuning");
+
+static const struct nla_policy cttimeout_nla_policy[CTA_TIMEOUT_MAX+1] = {
+ [CTA_TIMEOUT_NAME] = { .type = NLA_NUL_STRING,
+ .len = CTNL_TIMEOUT_NAME_MAX - 1},
+ [CTA_TIMEOUT_L3PROTO] = { .type = NLA_U16 },
+ [CTA_TIMEOUT_L4PROTO] = { .type = NLA_U8 },
+ [CTA_TIMEOUT_DATA] = { .type = NLA_NESTED },
+};
+
+static struct nfct_timeout_pernet *nfct_timeout_pernet(struct net *net)
+{
+ return net_generic(net, nfct_timeout_id);
+}
+
+static int
+ctnl_timeout_parse_policy(void *timeout,
+ const struct nf_conntrack_l4proto *l4proto,
+ struct net *net, const struct nlattr *attr)
+{
+ struct nlattr **tb;
+ int ret = 0;
+
+ tb = kcalloc(l4proto->ctnl_timeout.nlattr_max + 1, sizeof(*tb),
+ GFP_KERNEL);
+
+ if (!tb)
+ return -ENOMEM;
+
+ ret = nla_parse_nested_deprecated(tb,
+ l4proto->ctnl_timeout.nlattr_max,
+ attr,
+ l4proto->ctnl_timeout.nla_policy,
+ NULL);
+ if (ret < 0)
+ goto err;
+
+ ret = l4proto->ctnl_timeout.nlattr_to_obj(tb, net, timeout);
+
+err:
+ kfree(tb);
+ return ret;
+}
+
+static int cttimeout_new_timeout(struct sk_buff *skb,
+ const struct nfnl_info *info,
+ const struct nlattr * const cda[])
+{
+ struct nfct_timeout_pernet *pernet = nfct_timeout_pernet(info->net);
+ __u16 l3num;
+ __u8 l4num;
+ const struct nf_conntrack_l4proto *l4proto;
+ struct ctnl_timeout *timeout, *matching = NULL;
+ char *name;
+ int ret;
+
+ if (!cda[CTA_TIMEOUT_NAME] ||
+ !cda[CTA_TIMEOUT_L3PROTO] ||
+ !cda[CTA_TIMEOUT_L4PROTO] ||
+ !cda[CTA_TIMEOUT_DATA])
+ return -EINVAL;
+
+ name = nla_data(cda[CTA_TIMEOUT_NAME]);
+ l3num = ntohs(nla_get_be16(cda[CTA_TIMEOUT_L3PROTO]));
+ l4num = nla_get_u8(cda[CTA_TIMEOUT_L4PROTO]);
+
+ list_for_each_entry(timeout, &pernet->nfct_timeout_list, head) {
+ if (strncmp(timeout->name, name, CTNL_TIMEOUT_NAME_MAX) != 0)
+ continue;
+
+ if (info->nlh->nlmsg_flags & NLM_F_EXCL)
+ return -EEXIST;
+
+ matching = timeout;
+ break;
+ }
+
+ if (matching) {
+ if (info->nlh->nlmsg_flags & NLM_F_REPLACE) {
+ /* You cannot replace one timeout policy by another of
+ * different kind, sorry.
+ */
+ if (matching->timeout.l3num != l3num ||
+ matching->timeout.l4proto->l4proto != l4num)
+ return -EINVAL;
+
+ return ctnl_timeout_parse_policy(&matching->timeout.data,
+ matching->timeout.l4proto,
+ info->net,
+ cda[CTA_TIMEOUT_DATA]);
+ }
+
+ return -EBUSY;
+ }
+
+ l4proto = nf_ct_l4proto_find(l4num);
+
+ /* This protocol is not supportted, skip. */
+ if (l4proto->l4proto != l4num) {
+ ret = -EOPNOTSUPP;
+ goto err_proto_put;
+ }
+
+ timeout = kzalloc(sizeof(struct ctnl_timeout) +
+ l4proto->ctnl_timeout.obj_size, GFP_KERNEL);
+ if (timeout == NULL) {
+ ret = -ENOMEM;
+ goto err_proto_put;
+ }
+
+ ret = ctnl_timeout_parse_policy(&timeout->timeout.data, l4proto,
+ info->net, cda[CTA_TIMEOUT_DATA]);
+ if (ret < 0)
+ goto err;
+
+ strcpy(timeout->name, nla_data(cda[CTA_TIMEOUT_NAME]));
+ timeout->timeout.l3num = l3num;
+ timeout->timeout.l4proto = l4proto;
+ refcount_set(&timeout->refcnt, 1);
+ __module_get(THIS_MODULE);
+ list_add_tail_rcu(&timeout->head, &pernet->nfct_timeout_list);
+
+ return 0;
+err:
+ kfree(timeout);
+err_proto_put:
+ return ret;
+}
+
+static int
+ctnl_timeout_fill_info(struct sk_buff *skb, u32 portid, u32 seq, u32 type,
+ int event, struct ctnl_timeout *timeout)
+{
+ struct nlmsghdr *nlh;
+ unsigned int flags = portid ? NLM_F_MULTI : 0;
+ const struct nf_conntrack_l4proto *l4proto = timeout->timeout.l4proto;
+ struct nlattr *nest_parms;
+ int ret;
+
+ event = nfnl_msg_type(NFNL_SUBSYS_CTNETLINK_TIMEOUT, event);
+ nlh = nfnl_msg_put(skb, portid, seq, event, flags, AF_UNSPEC,
+ NFNETLINK_V0, 0);
+ if (!nlh)
+ goto nlmsg_failure;
+
+ if (nla_put_string(skb, CTA_TIMEOUT_NAME, timeout->name) ||
+ nla_put_be16(skb, CTA_TIMEOUT_L3PROTO,
+ htons(timeout->timeout.l3num)) ||
+ nla_put_u8(skb, CTA_TIMEOUT_L4PROTO, l4proto->l4proto) ||
+ nla_put_be32(skb, CTA_TIMEOUT_USE,
+ htonl(refcount_read(&timeout->refcnt))))
+ goto nla_put_failure;
+
+ nest_parms = nla_nest_start(skb, CTA_TIMEOUT_DATA);
+ if (!nest_parms)
+ goto nla_put_failure;
+
+ ret = l4proto->ctnl_timeout.obj_to_nlattr(skb, &timeout->timeout.data);
+ if (ret < 0)
+ goto nla_put_failure;
+
+ nla_nest_end(skb, nest_parms);
+
+ nlmsg_end(skb, nlh);
+ return skb->len;
+
+nlmsg_failure:
+nla_put_failure:
+ nlmsg_cancel(skb, nlh);
+ return -1;
+}
+
+static int
+ctnl_timeout_dump(struct sk_buff *skb, struct netlink_callback *cb)
+{
+ struct nfct_timeout_pernet *pernet;
+ struct net *net = sock_net(skb->sk);
+ struct ctnl_timeout *cur, *last;
+
+ if (cb->args[2])
+ return 0;
+
+ last = (struct ctnl_timeout *)cb->args[1];
+ if (cb->args[1])
+ cb->args[1] = 0;
+
+ rcu_read_lock();
+ pernet = nfct_timeout_pernet(net);
+ list_for_each_entry_rcu(cur, &pernet->nfct_timeout_list, head) {
+ if (last) {
+ if (cur != last)
+ continue;
+
+ last = NULL;
+ }
+ if (ctnl_timeout_fill_info(skb, NETLINK_CB(cb->skb).portid,
+ cb->nlh->nlmsg_seq,
+ NFNL_MSG_TYPE(cb->nlh->nlmsg_type),
+ IPCTNL_MSG_TIMEOUT_NEW, cur) < 0) {
+ cb->args[1] = (unsigned long)cur;
+ break;
+ }
+ }
+ if (!cb->args[1])
+ cb->args[2] = 1;
+ rcu_read_unlock();
+ return skb->len;
+}
+
+static int cttimeout_get_timeout(struct sk_buff *skb,
+ const struct nfnl_info *info,
+ const struct nlattr * const cda[])
+{
+ struct nfct_timeout_pernet *pernet = nfct_timeout_pernet(info->net);
+ int ret = -ENOENT;
+ char *name;
+ struct ctnl_timeout *cur;
+
+ if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
+ struct netlink_dump_control c = {
+ .dump = ctnl_timeout_dump,
+ };
+ return netlink_dump_start(info->sk, skb, info->nlh, &c);
+ }
+
+ if (!cda[CTA_TIMEOUT_NAME])
+ return -EINVAL;
+ name = nla_data(cda[CTA_TIMEOUT_NAME]);
+
+ list_for_each_entry(cur, &pernet->nfct_timeout_list, head) {
+ struct sk_buff *skb2;
+
+ if (strncmp(cur->name, name, CTNL_TIMEOUT_NAME_MAX) != 0)
+ continue;
+
+ skb2 = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
+ if (skb2 == NULL) {
+ ret = -ENOMEM;
+ break;
+ }
+
+ ret = ctnl_timeout_fill_info(skb2, NETLINK_CB(skb).portid,
+ info->nlh->nlmsg_seq,
+ NFNL_MSG_TYPE(info->nlh->nlmsg_type),
+ IPCTNL_MSG_TIMEOUT_NEW, cur);
+ if (ret <= 0) {
+ kfree_skb(skb2);
+ break;
+ }
+
+ ret = nfnetlink_unicast(skb2, info->net, NETLINK_CB(skb).portid);
+ break;
+ }
+
+ return ret;
+}
+
+/* try to delete object, fail if it is still in use. */
+static int ctnl_timeout_try_del(struct net *net, struct ctnl_timeout *timeout)
+{
+ int ret = 0;
+
+ /* We want to avoid races with ctnl_timeout_put. So only when the
+ * current refcnt is 1, we decrease it to 0.
+ */
+ if (refcount_dec_if_one(&timeout->refcnt)) {
+ /* We are protected by nfnl mutex. */
+ list_del_rcu(&timeout->head);
+ nf_ct_untimeout(net, &timeout->timeout);
+ kfree_rcu(timeout, rcu_head);
+ } else {
+ ret = -EBUSY;
+ }
+ return ret;
+}
+
+static int cttimeout_del_timeout(struct sk_buff *skb,
+ const struct nfnl_info *info,
+ const struct nlattr * const cda[])
+{
+ struct nfct_timeout_pernet *pernet = nfct_timeout_pernet(info->net);
+ struct ctnl_timeout *cur, *tmp;
+ int ret = -ENOENT;
+ char *name;
+
+ if (!cda[CTA_TIMEOUT_NAME]) {
+ list_for_each_entry_safe(cur, tmp, &pernet->nfct_timeout_list,
+ head)
+ ctnl_timeout_try_del(info->net, cur);
+
+ return 0;
+ }
+ name = nla_data(cda[CTA_TIMEOUT_NAME]);
+
+ list_for_each_entry(cur, &pernet->nfct_timeout_list, head) {
+ if (strncmp(cur->name, name, CTNL_TIMEOUT_NAME_MAX) != 0)
+ continue;
+
+ ret = ctnl_timeout_try_del(info->net, cur);
+ if (ret < 0)
+ return ret;
+
+ break;
+ }
+ return ret;
+}
+
+static int cttimeout_default_set(struct sk_buff *skb,
+ const struct nfnl_info *info,
+ const struct nlattr * const cda[])
+{
+ const struct nf_conntrack_l4proto *l4proto;
+ __u8 l4num;
+ int ret;
+
+ if (!cda[CTA_TIMEOUT_L3PROTO] ||
+ !cda[CTA_TIMEOUT_L4PROTO] ||
+ !cda[CTA_TIMEOUT_DATA])
+ return -EINVAL;
+
+ l4num = nla_get_u8(cda[CTA_TIMEOUT_L4PROTO]);
+ l4proto = nf_ct_l4proto_find(l4num);
+
+ /* This protocol is not supported, skip. */
+ if (l4proto->l4proto != l4num) {
+ ret = -EOPNOTSUPP;
+ goto err;
+ }
+
+ ret = ctnl_timeout_parse_policy(NULL, l4proto, info->net,
+ cda[CTA_TIMEOUT_DATA]);
+ if (ret < 0)
+ goto err;
+
+ return 0;
+err:
+ return ret;
+}
+
+static int
+cttimeout_default_fill_info(struct net *net, struct sk_buff *skb, u32 portid,
+ u32 seq, u32 type, int event, u16 l3num,
+ const struct nf_conntrack_l4proto *l4proto,
+ const unsigned int *timeouts)
+{
+ struct nlmsghdr *nlh;
+ unsigned int flags = portid ? NLM_F_MULTI : 0;
+ struct nlattr *nest_parms;
+ int ret;
+
+ event = nfnl_msg_type(NFNL_SUBSYS_CTNETLINK_TIMEOUT, event);
+ nlh = nfnl_msg_put(skb, portid, seq, event, flags, AF_UNSPEC,
+ NFNETLINK_V0, 0);
+ if (!nlh)
+ goto nlmsg_failure;
+
+ if (nla_put_be16(skb, CTA_TIMEOUT_L3PROTO, htons(l3num)) ||
+ nla_put_u8(skb, CTA_TIMEOUT_L4PROTO, l4proto->l4proto))
+ goto nla_put_failure;
+
+ nest_parms = nla_nest_start(skb, CTA_TIMEOUT_DATA);
+ if (!nest_parms)
+ goto nla_put_failure;
+
+ ret = l4proto->ctnl_timeout.obj_to_nlattr(skb, timeouts);
+ if (ret < 0)
+ goto nla_put_failure;
+
+ nla_nest_end(skb, nest_parms);
+
+ nlmsg_end(skb, nlh);
+ return skb->len;
+
+nlmsg_failure:
+nla_put_failure:
+ nlmsg_cancel(skb, nlh);
+ return -1;
+}
+
+static int cttimeout_default_get(struct sk_buff *skb,
+ const struct nfnl_info *info,
+ const struct nlattr * const cda[])
+{
+ const struct nf_conntrack_l4proto *l4proto;
+ unsigned int *timeouts = NULL;
+ struct sk_buff *skb2;
+ __u16 l3num;
+ __u8 l4num;
+ int ret;
+
+ if (!cda[CTA_TIMEOUT_L3PROTO] || !cda[CTA_TIMEOUT_L4PROTO])
+ return -EINVAL;
+
+ l3num = ntohs(nla_get_be16(cda[CTA_TIMEOUT_L3PROTO]));
+ l4num = nla_get_u8(cda[CTA_TIMEOUT_L4PROTO]);
+ l4proto = nf_ct_l4proto_find(l4num);
+
+ if (l4proto->l4proto != l4num)
+ return -EOPNOTSUPP;
+
+ switch (l4proto->l4proto) {
+ case IPPROTO_ICMP:
+ timeouts = &nf_icmp_pernet(info->net)->timeout;
+ break;
+ case IPPROTO_TCP:
+ timeouts = nf_tcp_pernet(info->net)->timeouts;
+ break;
+ case IPPROTO_UDP:
+ case IPPROTO_UDPLITE:
+ timeouts = nf_udp_pernet(info->net)->timeouts;
+ break;
+ case IPPROTO_DCCP:
+#ifdef CONFIG_NF_CT_PROTO_DCCP
+ timeouts = nf_dccp_pernet(info->net)->dccp_timeout;
+#endif
+ break;
+ case IPPROTO_ICMPV6:
+ timeouts = &nf_icmpv6_pernet(info->net)->timeout;
+ break;
+ case IPPROTO_SCTP:
+#ifdef CONFIG_NF_CT_PROTO_SCTP
+ timeouts = nf_sctp_pernet(info->net)->timeouts;
+#endif
+ break;
+ case IPPROTO_GRE:
+#ifdef CONFIG_NF_CT_PROTO_GRE
+ timeouts = nf_gre_pernet(info->net)->timeouts;
+#endif
+ break;
+ case 255:
+ timeouts = &nf_generic_pernet(info->net)->timeout;
+ break;
+ default:
+ WARN_ONCE(1, "Missing timeouts for proto %d", l4proto->l4proto);
+ break;
+ }
+
+ if (!timeouts)
+ return -EOPNOTSUPP;
+
+ skb2 = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
+ if (!skb2)
+ return -ENOMEM;
+
+ ret = cttimeout_default_fill_info(info->net, skb2,
+ NETLINK_CB(skb).portid,
+ info->nlh->nlmsg_seq,
+ NFNL_MSG_TYPE(info->nlh->nlmsg_type),
+ IPCTNL_MSG_TIMEOUT_DEFAULT_SET,
+ l3num, l4proto, timeouts);
+ if (ret <= 0) {
+ kfree_skb(skb2);
+ return -ENOMEM;
+ }
+
+ return nfnetlink_unicast(skb2, info->net, NETLINK_CB(skb).portid);
+}
+
+static struct nf_ct_timeout *ctnl_timeout_find_get(struct net *net,
+ const char *name)
+{
+ struct nfct_timeout_pernet *pernet = nfct_timeout_pernet(net);
+ struct ctnl_timeout *timeout, *matching = NULL;
+
+ list_for_each_entry_rcu(timeout, &pernet->nfct_timeout_list, head) {
+ if (strncmp(timeout->name, name, CTNL_TIMEOUT_NAME_MAX) != 0)
+ continue;
+
+ if (!refcount_inc_not_zero(&timeout->refcnt))
+ goto err;
+ matching = timeout;
+ break;
+ }
+err:
+ return matching ? &matching->timeout : NULL;
+}
+
+static void ctnl_timeout_put(struct nf_ct_timeout *t)
+{
+ struct ctnl_timeout *timeout =
+ container_of(t, struct ctnl_timeout, timeout);
+
+ if (refcount_dec_and_test(&timeout->refcnt)) {
+ kfree_rcu(timeout, rcu_head);
+ module_put(THIS_MODULE);
+ }
+}
+
+static const struct nfnl_callback cttimeout_cb[IPCTNL_MSG_TIMEOUT_MAX] = {
+ [IPCTNL_MSG_TIMEOUT_NEW] = {
+ .call = cttimeout_new_timeout,
+ .type = NFNL_CB_MUTEX,
+ .attr_count = CTA_TIMEOUT_MAX,
+ .policy = cttimeout_nla_policy
+ },
+ [IPCTNL_MSG_TIMEOUT_GET] = {
+ .call = cttimeout_get_timeout,
+ .type = NFNL_CB_MUTEX,
+ .attr_count = CTA_TIMEOUT_MAX,
+ .policy = cttimeout_nla_policy
+ },
+ [IPCTNL_MSG_TIMEOUT_DELETE] = {
+ .call = cttimeout_del_timeout,
+ .type = NFNL_CB_MUTEX,
+ .attr_count = CTA_TIMEOUT_MAX,
+ .policy = cttimeout_nla_policy
+ },
+ [IPCTNL_MSG_TIMEOUT_DEFAULT_SET] = {
+ .call = cttimeout_default_set,
+ .type = NFNL_CB_MUTEX,
+ .attr_count = CTA_TIMEOUT_MAX,
+ .policy = cttimeout_nla_policy
+ },
+ [IPCTNL_MSG_TIMEOUT_DEFAULT_GET] = {
+ .call = cttimeout_default_get,
+ .type = NFNL_CB_MUTEX,
+ .attr_count = CTA_TIMEOUT_MAX,
+ .policy = cttimeout_nla_policy
+ },
+};
+
+static const struct nfnetlink_subsystem cttimeout_subsys = {
+ .name = "conntrack_timeout",
+ .subsys_id = NFNL_SUBSYS_CTNETLINK_TIMEOUT,
+ .cb_count = IPCTNL_MSG_TIMEOUT_MAX,
+ .cb = cttimeout_cb,
+};
+
+MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_CTNETLINK_TIMEOUT);
+
+static int __net_init cttimeout_net_init(struct net *net)
+{
+ struct nfct_timeout_pernet *pernet = nfct_timeout_pernet(net);
+
+ INIT_LIST_HEAD(&pernet->nfct_timeout_list);
+ INIT_LIST_HEAD(&pernet->nfct_timeout_freelist);
+
+ return 0;
+}
+
+static void __net_exit cttimeout_net_pre_exit(struct net *net)
+{
+ struct nfct_timeout_pernet *pernet = nfct_timeout_pernet(net);
+ struct ctnl_timeout *cur, *tmp;
+
+ list_for_each_entry_safe(cur, tmp, &pernet->nfct_timeout_list, head) {
+ list_del_rcu(&cur->head);
+ list_add(&cur->free_head, &pernet->nfct_timeout_freelist);
+ }
+
+ /* core calls synchronize_rcu() after this */
+}
+
+static void __net_exit cttimeout_net_exit(struct net *net)
+{
+ struct nfct_timeout_pernet *pernet = nfct_timeout_pernet(net);
+ struct ctnl_timeout *cur, *tmp;
+
+ if (list_empty(&pernet->nfct_timeout_freelist))
+ return;
+
+ nf_ct_untimeout(net, NULL);
+
+ list_for_each_entry_safe(cur, tmp, &pernet->nfct_timeout_freelist, free_head) {
+ list_del(&cur->free_head);
+
+ if (refcount_dec_and_test(&cur->refcnt))
+ kfree_rcu(cur, rcu_head);
+ }
+}
+
+static struct pernet_operations cttimeout_ops = {
+ .init = cttimeout_net_init,
+ .pre_exit = cttimeout_net_pre_exit,
+ .exit = cttimeout_net_exit,
+ .id = &nfct_timeout_id,
+ .size = sizeof(struct nfct_timeout_pernet),
+};
+
+static const struct nf_ct_timeout_hooks hooks = {
+ .timeout_find_get = ctnl_timeout_find_get,
+ .timeout_put = ctnl_timeout_put,
+};
+
+static int __init cttimeout_init(void)
+{
+ int ret;
+
+ ret = register_pernet_subsys(&cttimeout_ops);
+ if (ret < 0)
+ return ret;
+
+ ret = nfnetlink_subsys_register(&cttimeout_subsys);
+ if (ret < 0) {
+ pr_err("cttimeout_init: cannot register cttimeout with "
+ "nfnetlink.\n");
+ goto err_out;
+ }
+ RCU_INIT_POINTER(nf_ct_timeout_hook, &hooks);
+ return 0;
+
+err_out:
+ unregister_pernet_subsys(&cttimeout_ops);
+ return ret;
+}
+
+static int untimeout(struct nf_conn *ct, void *timeout)
+{
+ struct nf_conn_timeout *timeout_ext = nf_ct_timeout_find(ct);
+
+ if (timeout_ext)
+ RCU_INIT_POINTER(timeout_ext->timeout, NULL);
+
+ return 0;
+}
+
+static void __exit cttimeout_exit(void)
+{
+ nfnetlink_subsys_unregister(&cttimeout_subsys);
+
+ unregister_pernet_subsys(&cttimeout_ops);
+ RCU_INIT_POINTER(nf_ct_timeout_hook, NULL);
+
+ nf_ct_iterate_destroy(untimeout, NULL);
+}
+
+module_init(cttimeout_init);
+module_exit(cttimeout_exit);
generated by cgit v1.2.3 (git 2.39.1) at 2024-06-09 11:25:07 +0000