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netfilter: ctnetlink: allow to set expectfn for expectations

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This patch allows you to set expectfn which is specifically used
by the NAT side of most of the existing conntrack helpers.

I have added a symbol map that uses a string as key to look up for
the function that is attached to the expectation object. This is
the best solution I came out with to solve this issue.

Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
This commit is contained in:
Pablo Neira Ayuso 2012-02-05 03:44:51 +01:00
commit 544d5c7d9f
7 changed files with 115 additions and 1 deletions
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13
include/net/netfilter/nf_conntrack_helper.h
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@ -69,4 +69,17 @@ extern int nf_conntrack_broadcast_help(struct sk_buff *skb,
enum ip_conntrack_info ctinfo,
unsigned int timeout);
struct nf_ct_helper_expectfn {
struct list_head head;
const char *name;
void (*expectfn)(struct nf_conn *ct, struct nf_conntrack_expect *exp);
};
void nf_ct_helper_expectfn_register(struct nf_ct_helper_expectfn *n);
void nf_ct_helper_expectfn_unregister(struct nf_ct_helper_expectfn *n);
struct nf_ct_helper_expectfn *
nf_ct_helper_expectfn_find_by_name(const char *name);
struct nf_ct_helper_expectfn *
nf_ct_helper_expectfn_find_by_symbol(const void *symbol);
#endif /*_NF_CONNTRACK_HELPER_H*/