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netfilter: ctnetlink: fix creation of conntrack with helpers 

This patch fixes a bug that triggers an assertion if you create
a conntrack entry with a helper and netfilter debugging is enabled.
Basically, we hit the assertion because the confirmation flag is
set before the conntrack extensions are added. To fix this, we
move the extension addition before the aforementioned flag is
set.

This patch also removes the possibility of setting a helper for
existing conntracks. This operation would also trigger the
assertion since we are not allowed to add new extensions for
existing conntracks. We know noone that could benefit from
this operation sanely.

Thanks to Eric Dumazet for initial posting a preliminary patch
to address this issue.

Reported-by: David Ramblewski <David.Ramblewski@atosorigin.com>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com>
Signed-off-by: Patrick McHardy <kaber@trash.net>
This commit is contained in:
Pablo Neira Ayuso 2010-02-19 14:24:39 +01:00 committed by Patrick McHardy
parent 4bac6b1807
commit a88e22adf5
1 changed files with 11 additions and 11 deletions
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22
net/netfilter/nf_conntrack_netlink.c
View File

@ -1077,9 +1077,8 @@ ctnetlink_change_helper(struct nf_conn *ct, const struct nlattr * const cda[])
/* need to zero data of old helper */
memset(&help->help, 0, sizeof(help->help));
} else {
help = nf_ct_helper_ext_add(ct, GFP_ATOMIC);
if (help == NULL)
return -ENOMEM;
/* we cannot set a helper for an existing conntrack */
return -EOPNOTSUPP;
}
rcu_assign_pointer(help->helper, helper);
@ -1263,7 +1262,6 @@ ctnetlink_create_conntrack(struct net *net, u16 zone,
ct->timeout.expires = ntohl(nla_get_be32(cda[CTA_TIMEOUT]));
ct->timeout.expires = jiffies + ct->timeout.expires * HZ;
ct->status |= IPS_CONFIRMED;
rcu_read_lock();
if (cda[CTA_HELP]) {
@ -1314,14 +1312,19 @@ ctnetlink_create_conntrack(struct net *net, u16 zone,
goto err2;
}
if (cda[CTA_STATUS]) {
err = ctnetlink_change_status(ct, cda);
if (cda[CTA_NAT_SRC] || cda[CTA_NAT_DST]) {
err = ctnetlink_change_nat(ct, cda);
if (err < 0)
goto err2;
}
if (cda[CTA_NAT_SRC] || cda[CTA_NAT_DST]) {
err = ctnetlink_change_nat(ct, cda);
nf_ct_acct_ext_add(ct, GFP_ATOMIC);
nf_ct_ecache_ext_add(ct, 0, 0, GFP_ATOMIC);
/* we must add conntrack extensions before confirmation. */
ct->status |= IPS_CONFIRMED;
if (cda[CTA_STATUS]) {
err = ctnetlink_change_status(ct, cda);
if (err < 0)
goto err2;
}
@ -1340,9 +1343,6 @@ ctnetlink_create_conntrack(struct net *net, u16 zone,
goto err2;
}
nf_ct_acct_ext_add(ct, GFP_ATOMIC);
nf_ct_ecache_ext_add(ct, 0, 0, GFP_ATOMIC);
#if defined(CONFIG_NF_CONNTRACK_MARK)
if (cda[CTA_MARK])
ct->mark = ntohl(nla_get_be32(cda[CTA_MARK]));