54 lines
1.8 KiB
C
54 lines
1.8 KiB
C
/*
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* connection tracking helpers.
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*
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* 16 Dec 2003: Yasuyuki Kozakai @USAGI <yasuyuki.kozakai@toshiba.co.jp>
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* - generalize L3 protocol dependent part.
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*
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* Derived from include/linux/netfiter_ipv4/ip_conntrack_helper.h
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*/
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#ifndef _NF_CONNTRACK_HELPER_H
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#define _NF_CONNTRACK_HELPER_H
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#include <net/netfilter/nf_conntrack.h>
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struct module;
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struct nf_conntrack_helper
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{
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struct list_head list; /* Internal use. */
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const char *name; /* name of the module */
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struct module *me; /* pointer to self */
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unsigned int max_expected; /* Maximum number of concurrent
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* expected connections */
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unsigned int timeout; /* timeout for expecteds */
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/* Mask of things we will help (compared against server response) */
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struct nf_conntrack_tuple tuple;
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struct nf_conntrack_tuple mask;
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/* Function to call when data passes; return verdict, or -1 to
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invalidate. */
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int (*help)(struct sk_buff **pskb,
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unsigned int protoff,
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struct nf_conn *ct,
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enum ip_conntrack_info conntrackinfo);
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int (*to_nfattr)(struct sk_buff *skb, const struct nf_conn *ct);
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};
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extern int nf_conntrack_helper_register(struct nf_conntrack_helper *);
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extern void nf_conntrack_helper_unregister(struct nf_conntrack_helper *);
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/* Allocate space for an expectation: this is mandatory before calling
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nf_conntrack_expect_related. You will have to call put afterwards. */
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extern struct nf_conntrack_expect *
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nf_conntrack_expect_alloc(struct nf_conn *master);
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extern void nf_conntrack_expect_put(struct nf_conntrack_expect *exp);
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/* Add an expected connection: can have more than one per connection */
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extern int nf_conntrack_expect_related(struct nf_conntrack_expect *exp);
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extern void nf_conntrack_unexpect_related(struct nf_conntrack_expect *exp);
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#endif /*_NF_CONNTRACK_HELPER_H*/
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