include/net/netfilter/nf_conntrack_timeout.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 #ifndef _NF_CONNTRACK_TIMEOUT_H
   3 #define _NF_CONNTRACK_TIMEOUT_H
   4
   5 #include <net/net_namespace.h>
   6 #include <linux/netfilter/nf_conntrack_common.h>
   7 #include <linux/netfilter/nf_conntrack_tuple_common.h>
   8 #include <linux/refcount.h>
   9 #include <net/netfilter/nf_conntrack.h>
  10 #include <net/netfilter/nf_conntrack_extend.h>
  11
  12 #define CTNL_TIMEOUT_NAME_MAX   32
  13
  14 struct ctnl_timeout {
  15         struct list_head        head;
  16         struct rcu_head         rcu_head;
  17         refcount_t              refcnt;
  18         char                    name[CTNL_TIMEOUT_NAME_MAX];
  19         __u16                   l3num;
  20         const struct nf_conntrack_l4proto *l4proto;
  21         char                    data[0];
  22 };
  23
  24 struct nf_conn_timeout {
  25         struct ctnl_timeout __rcu *timeout;
  26 };
  27
  28 static inline unsigned int *
  29 nf_ct_timeout_data(struct nf_conn_timeout *t)
  30 {
  31         struct ctnl_timeout *timeout;
  32
  33         timeout = rcu_dereference(t->timeout);
  34         if (timeout == NULL)
  35                 return NULL;
  36
  37         return (unsigned int *)timeout->data;
  38 }
  39
  40 static inline
  41 struct nf_conn_timeout *nf_ct_timeout_find(const struct nf_conn *ct)
  42 {
  43 #ifdef CONFIG_NF_CONNTRACK_TIMEOUT
  44         return nf_ct_ext_find(ct, NF_CT_EXT_TIMEOUT);
  45 #else
  46         return NULL;
  47 #endif
  48 }
  49
  50 static inline
  51 struct nf_conn_timeout *nf_ct_timeout_ext_add(struct nf_conn *ct,
  52                                               struct ctnl_timeout *timeout,
  53                                               gfp_t gfp)
  54 {
  55 #ifdef CONFIG_NF_CONNTRACK_TIMEOUT
  56         struct nf_conn_timeout *timeout_ext;
  57
  58         timeout_ext = nf_ct_ext_add(ct, NF_CT_EXT_TIMEOUT, gfp);
  59         if (timeout_ext == NULL)
  60                 return NULL;
  61
  62         rcu_assign_pointer(timeout_ext->timeout, timeout);
  63
  64         return timeout_ext;
  65 #else
  66         return NULL;
  67 #endif
  68 };
  69
  70 static inline unsigned int *
  71 nf_ct_timeout_lookup(struct net *net, struct nf_conn *ct,
  72                      const struct nf_conntrack_l4proto *l4proto)
  73 {
  74 #ifdef CONFIG_NF_CONNTRACK_TIMEOUT
  75         struct nf_conn_timeout *timeout_ext;
  76         unsigned int *timeouts;
  77
  78         timeout_ext = nf_ct_timeout_find(ct);
  79         if (timeout_ext) {
  80                 timeouts = nf_ct_timeout_data(timeout_ext);
  81                 if (unlikely(!timeouts))
  82                         timeouts = l4proto->get_timeouts(net);
  83         } else {
  84                 timeouts = l4proto->get_timeouts(net);
  85         }
  86
  87         return timeouts;
  88 #else
  89         return l4proto->get_timeouts(net);
  90 #endif
  91 }
  92
  93 #ifdef CONFIG_NF_CONNTRACK_TIMEOUT
  94 int nf_conntrack_timeout_init(void);
  95 void nf_conntrack_timeout_fini(void);
  96 #else
  97 static inline int nf_conntrack_timeout_init(void)
  98 {
  99         return 0;
 100 }
 101
 102 static inline void nf_conntrack_timeout_fini(void)
 103 {
 104         return;
 105 }
 106 #endif /* CONFIG_NF_CONNTRACK_TIMEOUT */
 107
 108 #ifdef CONFIG_NF_CONNTRACK_TIMEOUT
 109 extern struct ctnl_timeout *(*nf_ct_timeout_find_get_hook)(struct net *net, const char *name);
 110 extern void (*nf_ct_timeout_put_hook)(struct ctnl_timeout *timeout);
 111 #endif
 112
 113 #endif /* _NF_CONNTRACK_TIMEOUT_H */