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[NETFILTER]: ctnetlink: return EEXIST instead of EINVAL for existing nat'ed conntracks

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ctnetlink must return EEXIST for existing nat'ed conntracks instead of
EINVAL. Only return EINVAL if we try to update a conntrack with NAT
handlings (that is not allowed).

Decadence:libnetfilter_conntrack/utils# ./conntrack_create_nat
TEST: create conntrack (0)(Success)
Decadence:libnetfilter_conntrack/utils# ./conntrack_create_nat
TEST: create conntrack (-1)(Invalid argument)

Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
Signed-off-by: Patrick McHardy <kaber@trash.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Pablo Neira Ayuso 2007-08-07 18:11:26 -07:00 committed by David S. Miller
parent 3af8e31cf5
commit ff4ca8273e
1 changed files with 9 additions and 8 deletions
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17
net/netfilter/nf_conntrack_netlink.c
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@ -1052,17 +1052,18 @@ ctnetlink_new_conntrack(struct sock *ctnl, struct sk_buff *skb,
}
/* implicit 'else' */
/* we only allow nat config for new conntracks */
if (cda[CTA_NAT_SRC-1] || cda[CTA_NAT_DST-1]) {
err = -EINVAL;
goto out_unlock;
}
/* We manipulate the conntrack inside the global conntrack table lock,
* so there's no need to increase the refcount */
err = -EEXIST;
if (!(nlh->nlmsg_flags & NLM_F_EXCL))
err = ctnetlink_change_conntrack(nf_ct_tuplehash_to_ctrack(h), cda);
if (!(nlh->nlmsg_flags & NLM_F_EXCL)) {
/* we only allow nat config for new conntracks */
if (cda[CTA_NAT_SRC-1] || cda[CTA_NAT_DST-1]) {
err = -EINVAL;
goto out_unlock;
}
err = ctnetlink_change_conntrack(nf_ct_tuplehash_to_ctrack(h),
cda);
}
out_unlock:
write_unlock_bh(&nf_conntrack_lock);