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/*
* (C) 2012 by Pablo Neira Ayuso <pablo@netfilter.org>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*
*/
#include <linux/skbuff.h>
#include <linux/netfilter.h>
#include <linux/netfilter/nfnetlink.h>
#include <linux/netfilter/nfnetlink_queue.h>
#include <net/netfilter/nf_conntrack.h>
#include <net/netfilter/nfnetlink_queue.h>
struct nf_conn *nfqnl_ct_get(struct sk_buff *entskb, size_t *size,
enum ip_conntrack_info *ctinfo)
{
struct nfq_ct_hook *nfq_ct;
struct nf_conn *ct;
/* rcu_read_lock()ed by __nf_queue already. */
nfq_ct = rcu_dereference(nfq_ct_hook);
if (nfq_ct == NULL)
return NULL;
ct = nf_ct_get(entskb, ctinfo);
if (ct) {
if (!nf_ct_is_untracked(ct))
*size += nfq_ct->build_size(ct);
else
ct = NULL;
}
return ct;
}
struct nf_conn *
nfqnl_ct_parse(const struct sk_buff *skb, const struct nlattr *attr,
enum ip_conntrack_info *ctinfo)
{
struct nfq_ct_hook *nfq_ct;
struct nf_conn *ct;
/* rcu_read_lock()ed by __nf_queue already. */
nfq_ct = rcu_dereference(nfq_ct_hook);
if (nfq_ct == NULL)
return NULL;
ct = nf_ct_get(skb, ctinfo);
if (ct && !nf_ct_is_untracked(ct))
nfq_ct->parse(attr, ct);
return ct;
}
int nfqnl_ct_put(struct sk_buff *skb, struct nf_conn *ct,
enum ip_conntrack_info ctinfo)
{
struct nfq_ct_hook *nfq_ct;
struct nlattr *nest_parms;
u_int32_t tmp;
nfq_ct = rcu_dereference(nfq_ct_hook);
if (nfq_ct == NULL)
return 0;
nest_parms = nla_nest_start(skb, NFQA_CT | NLA_F_NESTED);
if (!nest_parms)
goto nla_put_failure;
if (nfq_ct->build(skb, ct) < 0)
goto nla_put_failure;
nla_nest_end(skb, nest_parms);
tmp = ctinfo;
if (nla_put_be32(skb, NFQA_CT_INFO, htonl(tmp)))
goto nla_put_failure;
return 0;
nla_put_failure:
return -1;
}
void nfqnl_ct_seq_adjust(struct sk_buff *skb, struct nf_conn *ct,
enum ip_conntrack_info ctinfo, int diff)
{
struct nfq_ct_nat_hook *nfq_nat_ct;
nfq_nat_ct = rcu_dereference(nfq_ct_nat_hook);
if (nfq_nat_ct == NULL)
return;
if ((ct->status & IPS_NAT_MASK) && diff)
nfq_nat_ct->seq_adjust(skb, ct, ctinfo, diff);
}
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