a900689264
This patch allows you to disable automatic conntrack helper lookup based on TCP/UDP ports, eg. echo 0 > /proc/sys/net/netfilter/nf_conntrack_helper [ Note: flows that already got a helper will keep using it even if automatic helper assignment has been disabled ] Once this behaviour has been disabled, you have to explicitly use the iptables CT target to attach helper to flows. There are good reasons to stop supporting automatic helper assignment, for further information, please read: http://www.netfilter.org/news.html#2012-04-03 This patch also adds one message to inform that automatic helper assignment is deprecated and it will be removed soon (this is spotted only once, with the first flow that gets a helper attached to make it as less annoying as possible). Signed-off-by: Eric Leblond <eric@regit.org> Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
86 lines
2.6 KiB
C
86 lines
2.6 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(struct net *net);
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extern void nf_conntrack_helper_fini(struct net *net);
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extern int nf_conntrack_broadcast_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 ctinfo,
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unsigned int timeout);
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struct nf_ct_helper_expectfn {
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struct list_head head;
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const char *name;
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void (*expectfn)(struct nf_conn *ct, struct nf_conntrack_expect *exp);
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};
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void nf_ct_helper_expectfn_register(struct nf_ct_helper_expectfn *n);
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void nf_ct_helper_expectfn_unregister(struct nf_ct_helper_expectfn *n);
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struct nf_ct_helper_expectfn *
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nf_ct_helper_expectfn_find_by_name(const char *name);
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struct nf_ct_helper_expectfn *
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nf_ct_helper_expectfn_find_by_symbol(const void *symbol);
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#endif /*_NF_CONNTRACK_HELPER_H*/
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