include/net/netfilter/nf_conntrack_timeout.h

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