LXR linux/include/net/netfilter/nf_conntrack

   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
  12struct 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
  22struct nf_conn_timeout {
  23        struct ctnl_timeout __rcu *timeout;
  24};
  25
  26static inline unsigned int *
  27nf_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
  38static inline
  39struct 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
  48static inline
  49struct 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
  68static inline unsigned int *
  69nf_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
  92int nf_conntrack_timeout_init(void);
  93void nf_conntrack_timeout_fini(void);
  94#else
  95static inline int nf_conntrack_timeout_init(void)
  96{
  97        return 0;
  98}
  99
 100static inline void nf_conntrack_timeout_fini(void)
 101{
 102        return;
 103}
 104#endif /* CONFIG_NF_CONNTRACK_TIMEOUT */
 105
 106#ifdef CONFIG_NF_CONNTRACK_TIMEOUT
 107extern struct ctnl_timeout *(*nf_ct_timeout_find_get_hook)(struct net *net, const char *name);
 108extern void (*nf_ct_timeout_put_hook)(struct ctnl_timeout *timeout);
 109#endif
 110
 111#endif /* _NF_CONNTRACK_TIMEOUT_H */
 112