diff options
Diffstat (limited to 'net/netfilter/nf_conntrack_timeout.c')
-rw-r--r-- | net/netfilter/nf_conntrack_timeout.c | 89 |
1 files changed, 89 insertions, 0 deletions
diff --git a/net/netfilter/nf_conntrack_timeout.c b/net/netfilter/nf_conntrack_timeout.c index 91fbd183da2d..edac8ea4436d 100644 --- a/net/netfilter/nf_conntrack_timeout.c +++ b/net/netfilter/nf_conntrack_timeout.c @@ -48,6 +48,95 @@ void nf_ct_untimeout(struct net *net, struct nf_ct_timeout *timeout) } EXPORT_SYMBOL_GPL(nf_ct_untimeout); +static void __nf_ct_timeout_put(struct nf_ct_timeout *timeout) +{ + typeof(nf_ct_timeout_put_hook) timeout_put; + + timeout_put = rcu_dereference(nf_ct_timeout_put_hook); + if (timeout_put) + timeout_put(timeout); +} + +int nf_ct_set_timeout(struct net *net, struct nf_conn *ct, + u8 l3num, u8 l4num, const char *timeout_name) +{ + typeof(nf_ct_timeout_find_get_hook) timeout_find_get; + struct nf_ct_timeout *timeout; + struct nf_conn_timeout *timeout_ext; + const char *errmsg = NULL; + int ret = 0; + + rcu_read_lock(); + timeout_find_get = rcu_dereference(nf_ct_timeout_find_get_hook); + if (!timeout_find_get) { + ret = -ENOENT; + errmsg = "Timeout policy base is empty"; + goto out; + } + + timeout = timeout_find_get(net, timeout_name); + if (!timeout) { + ret = -ENOENT; + pr_info_ratelimited("No such timeout policy \"%s\"\n", + timeout_name); + goto out; + } + + if (timeout->l3num != l3num) { + ret = -EINVAL; + pr_info_ratelimited("Timeout policy `%s' can only be used by " + "L%d protocol number %d\n", + timeout_name, 3, timeout->l3num); + goto err_put_timeout; + } + /* Make sure the timeout policy matches any existing protocol tracker, + * otherwise default to generic. + */ + if (timeout->l4proto->l4proto != l4num) { + ret = -EINVAL; + pr_info_ratelimited("Timeout policy `%s' can only be used by " + "L%d protocol number %d\n", + timeout_name, 4, timeout->l4proto->l4proto); + goto err_put_timeout; + } + timeout_ext = nf_ct_timeout_ext_add(ct, timeout, GFP_ATOMIC); + if (!timeout_ext) { + ret = -ENOMEM; + goto err_put_timeout; + } + + rcu_read_unlock(); + return ret; + +err_put_timeout: + __nf_ct_timeout_put(timeout); +out: + rcu_read_unlock(); + if (errmsg) + pr_info_ratelimited("%s\n", errmsg); + return ret; +} +EXPORT_SYMBOL_GPL(nf_ct_set_timeout); + +void nf_ct_destroy_timeout(struct nf_conn *ct) +{ + struct nf_conn_timeout *timeout_ext; + typeof(nf_ct_timeout_put_hook) timeout_put; + + rcu_read_lock(); + timeout_put = rcu_dereference(nf_ct_timeout_put_hook); + + if (timeout_put) { + timeout_ext = nf_ct_timeout_find(ct); + if (timeout_ext) { + timeout_put(timeout_ext->timeout); + RCU_INIT_POINTER(timeout_ext->timeout, NULL); + } + } + rcu_read_unlock(); +} +EXPORT_SYMBOL_GPL(nf_ct_destroy_timeout); + static const struct nf_ct_ext_type timeout_extend = { .len = sizeof(struct nf_conn_timeout), .align = __alignof__(struct nf_conn_timeout), |