LXR linux/include/net/netfilter/nf_conntrack

   1/*
   2 * connection tracking expectations.
   3 */
   4
   5#ifndef _NF_CONNTRACK_EXPECT_H
   6#define _NF_CONNTRACK_EXPECT_H
   7#include <net/netfilter/nf_conntrack.h>
   8
   9extern unsigned int nf_ct_expect_hsize;
  10extern unsigned int nf_ct_expect_max;
  11
  12struct nf_conntrack_expect {
  13        /* Conntrack expectation list member */
  14        struct hlist_node lnode;
  15
  16        /* Hash member */
  17        struct hlist_node hnode;
  18
  19        /* We expect this tuple, with the following mask */
  20        struct nf_conntrack_tuple tuple;
  21        struct nf_conntrack_tuple_mask mask;
  22
  23        /* Function to call after setup and insertion */
  24        void (*expectfn)(struct nf_conn *new,
  25                         struct nf_conntrack_expect *this);
  26
  27        /* Helper to assign to new connection */
  28        struct nf_conntrack_helper *helper;
  29
  30        /* The conntrack of the master connection */
  31        struct nf_conn *master;
  32
  33        /* Timer function; deletes the expectation. */
  34        struct timer_list timeout;
  35
  36        /* Usage count. */
  37        atomic_t use;
  38
  39        /* Flags */
  40        unsigned int flags;
  41
  42        /* Expectation class */
  43        unsigned int class;
  44
  45#ifdef CONFIG_NF_NAT_NEEDED
  46        __be32 saved_ip;
  47        /* This is the original per-proto part, used to map the
  48         * expected connection the way the recipient expects. */
  49        union nf_conntrack_man_proto saved_proto;
  50        /* Direction relative to the master connection. */
  51        enum ip_conntrack_dir dir;
  52#endif
  53
  54        struct rcu_head rcu;
  55};
  56
  57static inline struct net *nf_ct_exp_net(struct nf_conntrack_expect *exp)
  58{
  59        return nf_ct_net(exp->master);
  60}
  61
  62#define NF_CT_EXP_POLICY_NAME_LEN       16
  63
  64struct nf_conntrack_expect_policy {
  65        unsigned int    max_expected;
  66        unsigned int    timeout;
  67        char            name[NF_CT_EXP_POLICY_NAME_LEN];
  68};
  69
  70#define NF_CT_EXPECT_CLASS_DEFAULT      0
  71
  72int nf_conntrack_expect_init(struct net *net);
  73void nf_conntrack_expect_fini(struct net *net);
  74
  75struct nf_conntrack_expect *
  76__nf_ct_expect_find(struct net *net, u16 zone,
  77                    const struct nf_conntrack_tuple *tuple);
  78
  79struct nf_conntrack_expect *
  80nf_ct_expect_find_get(struct net *net, u16 zone,
  81                      const struct nf_conntrack_tuple *tuple);
  82
  83struct nf_conntrack_expect *
  84nf_ct_find_expectation(struct net *net, u16 zone,
  85                       const struct nf_conntrack_tuple *tuple);
  86
  87void nf_ct_unlink_expect_report(struct nf_conntrack_expect *exp,
  88                                u32 pid, int report);
  89static inline void nf_ct_unlink_expect(struct nf_conntrack_expect *exp)
  90{
  91        nf_ct_unlink_expect_report(exp, 0, 0);
  92}
  93
  94void nf_ct_remove_expectations(struct nf_conn *ct);
  95void nf_ct_unexpect_related(struct nf_conntrack_expect *exp);
  96
  97/* Allocate space for an expectation: this is mandatory before calling
  98   nf_ct_expect_related.  You will have to call put afterwards. */
  99struct nf_conntrack_expect *nf_ct_expect_alloc(struct nf_conn *me);
 100void nf_ct_expect_init(struct nf_conntrack_expect *, unsigned int, u_int8_t,
 101                       const union nf_inet_addr *,
 102                       const union nf_inet_addr *,
 103                       u_int8_t, const __be16 *, const __be16 *);
 104void nf_ct_expect_put(struct nf_conntrack_expect *exp);
 105int nf_ct_expect_related_report(struct nf_conntrack_expect *expect, 
 106                                u32 pid, int report);
 107static inline int nf_ct_expect_related(struct nf_conntrack_expect *expect)
 108{
 109        return nf_ct_expect_related_report(expect, 0, 0);
 110}
 111
 112#endif /*_NF_CONNTRACK_EXPECT_H*/
 113
 114