root/include/net/netfilter/nf_conntrack_expect.h

INCLUDED FROM

DEFINITIONS

1. nf_ct_exp_net

/*
 * connection tracking expectations.
 */

#ifndef _NF_CONNTRACK_EXPECT_H
#define _NF_CONNTRACK_EXPECT_H
#include <net/netfilter/nf_conntrack.h>

extern unsigned int nf_ct_expect_hsize;
extern unsigned int nf_ct_expect_max;

struct nf_conntrack_expect
{
        /* Conntrack expectation list member */
        struct hlist_node lnode;

        /* Hash member */
        struct hlist_node hnode;

        /* We expect this tuple, with the following mask */
        struct nf_conntrack_tuple tuple;
        struct nf_conntrack_tuple_mask mask;

        /* Function to call after setup and insertion */
        void (*expectfn)(struct nf_conn *new,
                         struct nf_conntrack_expect *this);

        /* Helper to assign to new connection */
        struct nf_conntrack_helper *helper;

        /* The conntrack of the master connection */
        struct nf_conn *master;

        /* Timer function; deletes the expectation. */
        struct timer_list timeout;

        /* Usage count. */
        atomic_t use;

        /* Flags */
        unsigned int flags;

        /* Expectation class */
        unsigned int class;

#ifdef CONFIG_NF_NAT_NEEDED
        __be32 saved_ip;
        /* This is the original per-proto part, used to map the
         * expected connection the way the recipient expects. */
        union nf_conntrack_man_proto saved_proto;
        /* Direction relative to the master connection. */
        enum ip_conntrack_dir dir;
#endif

        struct rcu_head rcu;
};

static inline struct net *nf_ct_exp_net(struct nf_conntrack_expect *exp)
{
#ifdef CONFIG_NET_NS
        return exp->master->ct_net;     /* by definition */
#else
        return &init_net;
#endif
}

struct nf_conntrack_expect_policy
{
        unsigned int    max_expected;
        unsigned int    timeout;
};

#define NF_CT_EXPECT_CLASS_DEFAULT      0

#define NF_CT_EXPECT_PERMANENT  0x1
#define NF_CT_EXPECT_INACTIVE   0x2

int nf_conntrack_expect_init(struct net *net);
void nf_conntrack_expect_fini(struct net *net);

struct nf_conntrack_expect *
__nf_ct_expect_find(struct net *net, const struct nf_conntrack_tuple *tuple);

struct nf_conntrack_expect *
nf_ct_expect_find_get(struct net *net, const struct nf_conntrack_tuple *tuple);

struct nf_conntrack_expect *
nf_ct_find_expectation(struct net *net, const struct nf_conntrack_tuple *tuple);

void nf_ct_unlink_expect(struct nf_conntrack_expect *exp);
void nf_ct_remove_expectations(struct nf_conn *ct);
void nf_ct_unexpect_related(struct nf_conntrack_expect *exp);

/* Allocate space for an expectation: this is mandatory before calling
   nf_ct_expect_related.  You will have to call put afterwards. */
struct nf_conntrack_expect *nf_ct_expect_alloc(struct nf_conn *me);
void nf_ct_expect_init(struct nf_conntrack_expect *, unsigned int, u_int8_t,
                       const union nf_inet_addr *,
                       const union nf_inet_addr *,
                       u_int8_t, const __be16 *, const __be16 *);
void nf_ct_expect_put(struct nf_conntrack_expect *exp);
int nf_ct_expect_related(struct nf_conntrack_expect *expect);

#endif /*_NF_CONNTRACK_EXPECT_H*/