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     *timeout;
  24};
  25
  26#define NF_CT_TIMEOUT_EXT_DATA(__t) (unsigned int *) &((__t)->timeout->data)
  27
  28static inline
  29struct nf_conn_timeout *nf_ct_timeout_find(const struct nf_conn *ct)
  30{
  31#ifdef CONFIG_NF_CONNTRACK_TIMEOUT
  32        return nf_ct_ext_find(ct, NF_CT_EXT_TIMEOUT);
  33#else
  34        return NULL;
  35#endif
  36}
  37
  38static inline
  39struct nf_conn_timeout *nf_ct_timeout_ext_add(struct nf_conn *ct,
  40                                              struct ctnl_timeout *timeout,
  41                                              gfp_t gfp)
  42{
  43#ifdef CONFIG_NF_CONNTRACK_TIMEOUT
  44        struct nf_conn_timeout *timeout_ext;
  45
  46        timeout_ext = nf_ct_ext_add(ct, NF_CT_EXT_TIMEOUT, gfp);
  47        if (timeout_ext == NULL)
  48                return NULL;
  49
  50        timeout_ext->timeout = timeout;
  51
  52        return timeout_ext;
  53#else
  54        return NULL;
  55#endif
  56};
  57
  58static inline unsigned int *
  59nf_ct_timeout_lookup(struct net *net, struct nf_conn *ct,
  60                     struct nf_conntrack_l4proto *l4proto)
  61{
  62#ifdef CONFIG_NF_CONNTRACK_TIMEOUT
  63        struct nf_conn_timeout *timeout_ext;
  64        unsigned int *timeouts;
  65
  66        timeout_ext = nf_ct_timeout_find(ct);
  67        if (timeout_ext)
  68                timeouts = NF_CT_TIMEOUT_EXT_DATA(timeout_ext);
  69        else
  70                timeouts = l4proto->get_timeouts(net);
  71
  72        return timeouts;
  73#else
  74        return l4proto->get_timeouts(net);
  75#endif
  76}
  77
  78#ifdef CONFIG_NF_CONNTRACK_TIMEOUT
  79int nf_conntrack_timeout_init(void);
  80void nf_conntrack_timeout_fini(void);
  81#else
  82static inline int nf_conntrack_timeout_init(void)
  83{
  84        return 0;
  85}
  86
  87static inline void nf_conntrack_timeout_fini(void)
  88{
  89        return;
  90}
  91#endif /* CONFIG_NF_CONNTRACK_TIMEOUT */
  92
  93#ifdef CONFIG_NF_CONNTRACK_TIMEOUT
  94extern struct ctnl_timeout *(*nf_ct_timeout_find_get_hook)(const char *name);
  95extern void (*nf_ct_timeout_put_hook)(struct ctnl_timeout *timeout);
  96#endif
  97
  98#endif /* _NF_CONNTRACK_TIMEOUT_H */
  99