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#ifdef CONFIG_NF_CONNTRACK_TIMEOUT
  36        struct nf_ct_timeout *timeout;
  37
  38        timeout = rcu_dereference(t->timeout);
  39        if (timeout == NULL)
  40                return NULL;
  41
  42        return (unsigned int *)timeout->data;
  43#else
  44        return NULL;
  45#endif
  46}
  47
  48static inline
  49struct nf_conn_timeout *nf_ct_timeout_find(const struct nf_conn *ct)
  50{
  51#ifdef CONFIG_NF_CONNTRACK_TIMEOUT
  52        return nf_ct_ext_find(ct, NF_CT_EXT_TIMEOUT);
  53#else
  54        return NULL;
  55#endif
  56}
  57
  58static inline
  59struct nf_conn_timeout *nf_ct_timeout_ext_add(struct nf_conn *ct,
  60                                              struct nf_ct_timeout *timeout,
  61                                              gfp_t gfp)
  62{
  63#ifdef CONFIG_NF_CONNTRACK_TIMEOUT
  64        struct nf_conn_timeout *timeout_ext;
  65
  66        timeout_ext = nf_ct_ext_add(ct, NF_CT_EXT_TIMEOUT, gfp);
  67        if (timeout_ext == NULL)
  68                return NULL;
  69
  70        rcu_assign_pointer(timeout_ext->timeout, timeout);
  71
  72        return timeout_ext;
  73#else
  74        return NULL;
  75#endif
  76};
  77
  78static inline unsigned int *nf_ct_timeout_lookup(const struct nf_conn *ct)
  79{
  80        unsigned int *timeouts = NULL;
  81#ifdef CONFIG_NF_CONNTRACK_TIMEOUT
  82        struct nf_conn_timeout *timeout_ext;
  83
  84        timeout_ext = nf_ct_timeout_find(ct);
  85        if (timeout_ext)
  86                timeouts = nf_ct_timeout_data(timeout_ext);
  87#endif
  88        return timeouts;
  89}
  90
  91#ifdef CONFIG_NF_CONNTRACK_TIMEOUT
  92int nf_conntrack_timeout_init(void);
  93void nf_conntrack_timeout_fini(void);
  94void nf_ct_untimeout(struct net *net, struct nf_ct_timeout *timeout);
  95int nf_ct_set_timeout(struct net *net, struct nf_conn *ct, u8 l3num, u8 l4num,
  96                      const char *timeout_name);
  97void nf_ct_destroy_timeout(struct nf_conn *ct);
  98#else
  99static inline int nf_conntrack_timeout_init(void)
 100{
 101        return 0;
 102}
 103
 104static inline void nf_conntrack_timeout_fini(void)
 105{
 106        return;
 107}
 108
 109static inline int nf_ct_set_timeout(struct net *net, struct nf_conn *ct,
 110                                    u8 l3num, u8 l4num,
 111                                    const char *timeout_name)
 112{
 113        return -EOPNOTSUPP;
 114}
 115
 116static inline void nf_ct_destroy_timeout(struct nf_conn *ct)
 117{
 118        return;
 119}
 120#endif /* CONFIG_NF_CONNTRACK_TIMEOUT */
 121
 122#ifdef CONFIG_NF_CONNTRACK_TIMEOUT
 123extern struct nf_ct_timeout *(*nf_ct_timeout_find_get_hook)(struct net *net, const char *name);
 124extern void (*nf_ct_timeout_put_hook)(struct nf_ct_timeout *timeout);
 125#endif
 126
 127#endif /* _NF_CONNTRACK_TIMEOUT_H */
 128