ac3247baf8
This adds a notifier chain based event mechanism for ip_conntrack state changes. As opposed to the previous implementations in patch-o-matic, we do no longer need a field in the skb to achieve this. Thanks to the valuable input from Patrick McHardy and Rusty on the idea of a per_cpu implementation. Signed-off-by: Harald Welte <laforge@netfilter.org> Signed-off-by: David S. Miller <davem@davemloft.net>
61 lines
1.8 KiB
C
61 lines
1.8 KiB
C
#ifndef _IP_CONNTRACK_CORE_H
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#define _IP_CONNTRACK_CORE_H
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#include <linux/netfilter.h>
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/* This header is used to share core functionality between the
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standalone connection tracking module, and the compatibility layer's use
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of connection tracking. */
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extern unsigned int ip_conntrack_in(unsigned int hooknum,
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struct sk_buff **pskb,
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const struct net_device *in,
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const struct net_device *out,
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int (*okfn)(struct sk_buff *));
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extern int ip_conntrack_init(void);
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extern void ip_conntrack_cleanup(void);
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struct ip_conntrack_protocol;
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extern int
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ip_ct_get_tuple(const struct iphdr *iph,
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const struct sk_buff *skb,
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unsigned int dataoff,
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struct ip_conntrack_tuple *tuple,
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const struct ip_conntrack_protocol *protocol);
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extern int
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ip_ct_invert_tuple(struct ip_conntrack_tuple *inverse,
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const struct ip_conntrack_tuple *orig,
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const struct ip_conntrack_protocol *protocol);
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/* Find a connection corresponding to a tuple. */
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struct ip_conntrack_tuple_hash *
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ip_conntrack_find_get(const struct ip_conntrack_tuple *tuple,
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const struct ip_conntrack *ignored_conntrack);
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extern int __ip_conntrack_confirm(struct sk_buff **pskb);
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/* Confirm a connection: returns NF_DROP if packet must be dropped. */
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static inline int ip_conntrack_confirm(struct sk_buff **pskb)
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{
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struct ip_conntrack *ct = (struct ip_conntrack *)(*pskb)->nfct;
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int ret = NF_ACCEPT;
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if (ct && !is_confirmed(ct))
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ret = __ip_conntrack_confirm(pskb);
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ip_conntrack_deliver_cached_events_for(ct);
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return ret;
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}
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#ifdef CONFIG_IP_NF_CONNTRACK_EVENTS
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struct ip_conntrack_ecache;
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extern void __ip_ct_deliver_cached_events(struct ip_conntrack_ecache *ec);
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#endif
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extern struct list_head *ip_conntrack_hash;
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extern struct list_head ip_conntrack_expect_list;
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extern rwlock_t ip_conntrack_lock;
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#endif /* _IP_CONNTRACK_CORE_H */
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