From: Martin Willi martin@strongswan.org
[ Upstream commit 6c0d95d1238d944fe54f0bbfc7ec017d78435daa ]
conntrack mark based dump filtering may falsely skip entries if a mask is given: If the mask-based check does not filter out the entry, the else-if check is always true and compares the mark without considering the mask. The if/else-if logic seems wrong.
Given that the mask during filter setup is implicitly set to 0xffffffff if not specified explicitly, the mark filtering flags seem to just complicate things. Restore the previously used approach by always matching against a zero mask is no filter mark is given.
Fixes: cb8aa9a3affb ("netfilter: ctnetlink: add kernel side filtering for dump") Signed-off-by: Martin Willi martin@strongswan.org Signed-off-by: Pablo Neira Ayuso pablo@netfilter.org Signed-off-by: Sasha Levin sashal@kernel.org --- net/netfilter/nf_conntrack_netlink.c | 19 +++---------------- 1 file changed, 3 insertions(+), 16 deletions(-)
diff --git a/net/netfilter/nf_conntrack_netlink.c b/net/netfilter/nf_conntrack_netlink.c index d65846aa80591..c3a4214dc9588 100644 --- a/net/netfilter/nf_conntrack_netlink.c +++ b/net/netfilter/nf_conntrack_netlink.c @@ -851,7 +851,6 @@ static int ctnetlink_done(struct netlink_callback *cb) }
struct ctnetlink_filter { - u_int32_t cta_flags; u8 family;
u_int32_t orig_flags; @@ -906,10 +905,6 @@ static int ctnetlink_parse_tuple_filter(const struct nlattr * const cda[], struct nf_conntrack_zone *zone, u_int32_t flags);
-/* applied on filters */ -#define CTA_FILTER_F_CTA_MARK (1 << 0) -#define CTA_FILTER_F_CTA_MARK_MASK (1 << 1) - static struct ctnetlink_filter * ctnetlink_alloc_filter(const struct nlattr * const cda[], u8 family) { @@ -930,14 +925,10 @@ ctnetlink_alloc_filter(const struct nlattr * const cda[], u8 family) #ifdef CONFIG_NF_CONNTRACK_MARK if (cda[CTA_MARK]) { filter->mark.val = ntohl(nla_get_be32(cda[CTA_MARK])); - filter->cta_flags |= CTA_FILTER_FLAG(CTA_MARK); - - if (cda[CTA_MARK_MASK]) { + if (cda[CTA_MARK_MASK]) filter->mark.mask = ntohl(nla_get_be32(cda[CTA_MARK_MASK])); - filter->cta_flags |= CTA_FILTER_FLAG(CTA_MARK_MASK); - } else { + else filter->mark.mask = 0xffffffff; - } } else if (cda[CTA_MARK_MASK]) { err = -EINVAL; goto err_filter; @@ -1117,11 +1108,7 @@ static int ctnetlink_filter_match(struct nf_conn *ct, void *data) }
#ifdef CONFIG_NF_CONNTRACK_MARK - if ((filter->cta_flags & CTA_FILTER_FLAG(CTA_MARK_MASK)) && - (ct->mark & filter->mark.mask) != filter->mark.val) - goto ignore_entry; - else if ((filter->cta_flags & CTA_FILTER_FLAG(CTA_MARK)) && - ct->mark != filter->mark.val) + if ((ct->mark & filter->mark.mask) != filter->mark.val) goto ignore_entry; #endif