Use RCU for expectation hash. This doesn't buy much for conntrack runtime performance, but allows to reduce the use of nf_conntrack_lock for /proc and nf_netlink_conntrack. Signed-off-by: Patrick McHardy <kaber@trash.net> Signed-off-by: David S. Miller <davem@davemloft.net>
86 lines
2.3 KiB
C
86 lines
2.3 KiB
C
/*
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* connection tracking expectations.
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*/
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#ifndef _NF_CONNTRACK_EXPECT_H
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#define _NF_CONNTRACK_EXPECT_H
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#include <net/netfilter/nf_conntrack.h>
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extern struct hlist_head *nf_ct_expect_hash;
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extern unsigned int nf_ct_expect_hsize;
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extern unsigned int nf_ct_expect_max;
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struct nf_conntrack_expect
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{
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/* Conntrack expectation list member */
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struct hlist_node lnode;
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/* Hash member */
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struct hlist_node hnode;
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/* We expect this tuple, with the following mask */
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struct nf_conntrack_tuple tuple;
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struct nf_conntrack_tuple_mask mask;
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/* Function to call after setup and insertion */
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void (*expectfn)(struct nf_conn *new,
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struct nf_conntrack_expect *this);
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/* Helper to assign to new connection */
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struct nf_conntrack_helper *helper;
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/* The conntrack of the master connection */
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struct nf_conn *master;
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/* Timer function; deletes the expectation. */
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struct timer_list timeout;
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/* Usage count. */
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atomic_t use;
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/* Flags */
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unsigned int flags;
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#ifdef CONFIG_NF_NAT_NEEDED
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__be32 saved_ip;
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/* This is the original per-proto part, used to map the
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* expected connection the way the recipient expects. */
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union nf_conntrack_man_proto saved_proto;
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/* Direction relative to the master connection. */
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enum ip_conntrack_dir dir;
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#endif
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struct rcu_head rcu;
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};
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#define NF_CT_EXPECT_PERMANENT 0x1
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int nf_conntrack_expect_init(void);
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void nf_conntrack_expect_fini(void);
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struct nf_conntrack_expect *
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__nf_ct_expect_find(const struct nf_conntrack_tuple *tuple);
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struct nf_conntrack_expect *
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nf_ct_expect_find_get(const struct nf_conntrack_tuple *tuple);
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struct nf_conntrack_expect *
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nf_ct_find_expectation(const struct nf_conntrack_tuple *tuple);
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void nf_ct_unlink_expect(struct nf_conntrack_expect *exp);
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void nf_ct_remove_expectations(struct nf_conn *ct);
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void nf_ct_unexpect_related(struct nf_conntrack_expect *exp);
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/* Allocate space for an expectation: this is mandatory before calling
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nf_ct_expect_related. You will have to call put afterwards. */
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struct nf_conntrack_expect *nf_ct_expect_alloc(struct nf_conn *me);
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void nf_ct_expect_init(struct nf_conntrack_expect *, int,
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union nf_inet_addr *,
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union nf_inet_addr *,
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u_int8_t, __be16 *, __be16 *);
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void nf_ct_expect_put(struct nf_conntrack_expect *exp);
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int nf_ct_expect_related(struct nf_conntrack_expect *expect);
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#endif /*_NF_CONNTRACK_EXPECT_H*/
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