LXR linux/include/net/netfilter/nf_conntrack

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