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netfilter pull request

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Merge tag 'nf-23-04-21' of git://git.kernel.org/pub/scm/linux/kernel/git/netfilter/nf

Pablo Neira Ayuso says:

====================
Netfilter fixes for net

1) Set on IPS_CONFIRMED before change_status() otherwise EBUSY is
   bogusly hit. This bug was introduced in the 6.3 release cycle.

2) Fix nfnetlink_queue conntrack support: Set/dump timeout
   accordingly for unconfirmed conntrack entries. Make sure this
   is done after IPS_CONFIRMED is set on. This is an old bug, it
   happens since the introduction of this feature.

* tag 'nf-23-04-21' of git://git.kernel.org/pub/scm/linux/kernel/git/netfilter/nf:
  netfilter: conntrack: fix wrong ct->timeout value
  netfilter: conntrack: restore IPS_CONFIRMED out of nf_conntrack_hash_check_insert()
====================

Link: https://lore.kernel.org/r/20230421105700.325438-1-pablo@netfilter.org
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Jakub Kicinski 2023-04-21 07:55:40 -07:00
commit f9bcdcec3b
4 changed files with 18 additions and 6 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

6
include/net/netfilter/nf_conntrack_core.h
View File

@ -89,7 +89,11 @@ static inline void __nf_ct_set_timeout(struct nf_conn *ct, u64 timeout)
{
if (timeout > INT_MAX)
timeout = INT_MAX;
WRITE_ONCE(ct->timeout, nfct_time_stamp + (u32)timeout);
if (nf_ct_is_confirmed(ct))
WRITE_ONCE(ct->timeout, nfct_time_stamp + (u32)timeout);
else
ct->timeout = (u32)timeout;
}
int __nf_ct_change_timeout(struct nf_conn *ct, u64 cta_timeout);

1
net/netfilter/nf_conntrack_bpf.c
View File

@ -381,6 +381,7 @@ __bpf_kfunc struct nf_conn *bpf_ct_insert_entry(struct nf_conn___init *nfct_i)
struct nf_conn *nfct = (struct nf_conn *)nfct_i;
int err;
nfct->status |= IPS_CONFIRMED;
err = nf_conntrack_hash_check_insert(nfct);
if (err < 0) {
nf_conntrack_free(nfct);

1
net/netfilter/nf_conntrack_core.c
View File

@ -932,7 +932,6 @@ nf_conntrack_hash_check_insert(struct nf_conn *ct)
goto out;
}
ct->status |= IPS_CONFIRMED;
smp_wmb();
/* The caller holds a reference to this object */
refcount_set(&ct->ct_general.use, 2);

16
net/netfilter/nf_conntrack_netlink.c
View File

@ -176,7 +176,12 @@ nla_put_failure:
static int ctnetlink_dump_timeout(struct sk_buff *skb, const struct nf_conn *ct,
bool skip_zero)
{
long timeout = nf_ct_expires(ct) / HZ;
long timeout;
if (nf_ct_is_confirmed(ct))
timeout = nf_ct_expires(ct) / HZ;
else
timeout = ct->timeout / HZ;
if (skip_zero && timeout == 0)
return 0;
@ -2253,9 +2258,6 @@ ctnetlink_create_conntrack(struct net *net,
if (!cda[CTA_TIMEOUT])
goto err1;
timeout = (u64)ntohl(nla_get_be32(cda[CTA_TIMEOUT])) * HZ;
__nf_ct_set_timeout(ct, timeout);
rcu_read_lock();
if (cda[CTA_HELP]) {
char *helpname = NULL;
@ -2316,6 +2318,12 @@ ctnetlink_create_conntrack(struct net *net,
nfct_seqadj_ext_add(ct);
nfct_synproxy_ext_add(ct);
/* we must add conntrack extensions before confirmation. */
ct->status |= IPS_CONFIRMED;
timeout = (u64)ntohl(nla_get_be32(cda[CTA_TIMEOUT])) * HZ;
__nf_ct_set_timeout(ct, timeout);
if (cda[CTA_STATUS]) {
err = ctnetlink_change_status(ct, cda);
if (err < 0)