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84f3bb9ae9
Add a new target for the raw table, which can be used to specify conntrack parameters for specific connections, f.i. the conntrack helper. The target attaches a "template" connection tracking entry to the skb, which is used by the conntrack core when initializing a new conntrack. Signed-off-by: Patrick McHardy <kaber@trash.net>
66 lines
1.9 KiB
C
66 lines
1.9 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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#include <net/netfilter/nf_conntrack_extend.h>
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struct module;
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#define NF_CT_HELPER_NAME_LEN 16
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struct nf_conntrack_helper {
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struct hlist_node hnode; /* 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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const struct nf_conntrack_expect_policy *expect_policy;
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/* Tuple of things we will help (compared against server response) */
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struct nf_conntrack_tuple tuple;
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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 *skb,
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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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void (*destroy)(struct nf_conn *ct);
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int (*to_nlattr)(struct sk_buff *skb, const struct nf_conn *ct);
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unsigned int expect_class_max;
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};
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extern struct nf_conntrack_helper *
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__nf_conntrack_helper_find(const char *name, u16 l3num, u8 protonum);
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extern struct nf_conntrack_helper *
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nf_conntrack_helper_try_module_get(const char *name, u16 l3num, u8 protonum);
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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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extern struct nf_conn_help *nf_ct_helper_ext_add(struct nf_conn *ct, gfp_t gfp);
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extern int __nf_ct_try_assign_helper(struct nf_conn *ct, struct nf_conn *tmpl,
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gfp_t flags);
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extern void nf_ct_helper_destroy(struct nf_conn *ct);
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static inline struct nf_conn_help *nfct_help(const struct nf_conn *ct)
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{
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return nf_ct_ext_find(ct, NF_CT_EXT_HELPER);
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}
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extern int nf_conntrack_helper_init(void);
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extern void nf_conntrack_helper_fini(void);
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#endif /*_NF_CONNTRACK_HELPER_H*/
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