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netfilter: ctnetlink: fix filtering for zone 0

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previously filtering for the default zone would actually skip the zone
filter and flush all zones.

Fixes: eff3c558bb ("netfilter: ctnetlink: support filtering by zone")
Reported-by: Ilya Maximets <i.maximets@ovn.org>
Closes: https://lore.kernel.org/netdev/2032238f-31ac-4106-8f22-522e76df5a12@ovn.org/
Signed-off-by: Felix Huettner <felix.huettner@mail.schwarz>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
This commit is contained in:
Felix Huettner 2024-02-05 09:59:59 +00:00 committed by Pablo Neira Ayuso
parent 27c5a095e2
commit fa173a1b4e
2 changed files with 50 additions and 5 deletions
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6
net/netfilter/nf_conntrack_netlink.c
View File

@ -876,6 +876,7 @@ struct ctnetlink_filter_u32 {
struct ctnetlink_filter { struct ctnetlink_filter {
u8 family; u8 family;
bool zone_filter;
u_int32_t orig_flags; u_int32_t orig_flags;
u_int32_t reply_flags; u_int32_t reply_flags;
@ -992,9 +993,12 @@ ctnetlink_alloc_filter(const struct nlattr * const cda[], u8 family)
if (err) if (err)
goto err_filter; goto err_filter;
if (cda[CTA_ZONE]) {
err = ctnetlink_parse_zone(cda[CTA_ZONE], &filter->zone); err = ctnetlink_parse_zone(cda[CTA_ZONE], &filter->zone);
if (err < 0) if (err < 0)
goto err_filter; goto err_filter;
filter->zone_filter = true;
}
if (!cda[CTA_FILTER]) if (!cda[CTA_FILTER])
return filter; return filter;
@ -1148,7 +1152,7 @@ static int ctnetlink_filter_match(struct nf_conn *ct, void *data)
if (filter->family && nf_ct_l3num(ct) != filter->family) if (filter->family && nf_ct_l3num(ct) != filter->family)
goto ignore_entry; goto ignore_entry;
if (filter->zone.id != NF_CT_DEFAULT_ZONE_ID && if (filter->zone_filter &&
!nf_ct_zone_equal_any(ct, &filter->zone)) !nf_ct_zone_equal_any(ct, &filter->zone))
goto ignore_entry; goto ignore_entry;

43
tools/testing/selftests/netfilter/conntrack_dump_flush.c
View File

@ -13,7 +13,7 @@
#include "../kselftest_harness.h" #include "../kselftest_harness.h"
#define TEST_ZONE_ID 123 #define TEST_ZONE_ID 123
#define CTA_FILTER_F_CTA_TUPLE_ZONE (1 << 2) #define NF_CT_DEFAULT_ZONE_ID 0
static int reply_counter; static int reply_counter;
@ -336,6 +336,9 @@ FIXTURE_SETUP(conntrack_dump_flush)
ret = conntrack_data_generate_v4(self->sock, 0xf4f4f4f4, 0xf5f5f5f5, ret = conntrack_data_generate_v4(self->sock, 0xf4f4f4f4, 0xf5f5f5f5,
TEST_ZONE_ID + 2); TEST_ZONE_ID + 2);
EXPECT_EQ(ret, 0); EXPECT_EQ(ret, 0);
ret = conntrack_data_generate_v4(self->sock, 0xf6f6f6f6, 0xf7f7f7f7,
NF_CT_DEFAULT_ZONE_ID);
EXPECT_EQ(ret, 0);
src = (struct in6_addr) {{ src = (struct in6_addr) {{
.__u6_addr32 = { .__u6_addr32 = {
@ -395,6 +398,26 @@ FIXTURE_SETUP(conntrack_dump_flush)
TEST_ZONE_ID + 2); TEST_ZONE_ID + 2);
EXPECT_EQ(ret, 0); EXPECT_EQ(ret, 0);
src = (struct in6_addr) {{
.__u6_addr32 = {
0xb80d0120,
0x00000000,
0x00000000,
0x07000000
}
}};
dst = (struct in6_addr) {{
.__u6_addr32 = {
0xb80d0120,
0x00000000,
0x00000000,
0x08000000
}
}};
ret = conntrack_data_generate_v6(self->sock, src, dst,
NF_CT_DEFAULT_ZONE_ID);
EXPECT_EQ(ret, 0);
ret = conntracK_count_zone(self->sock, TEST_ZONE_ID); ret = conntracK_count_zone(self->sock, TEST_ZONE_ID);
EXPECT_GE(ret, 2); EXPECT_GE(ret, 2);
if (ret > 2) if (ret > 2)
@ -425,6 +448,24 @@ TEST_F(conntrack_dump_flush, test_flush_by_zone)
EXPECT_EQ(ret, 2); EXPECT_EQ(ret, 2);
ret = conntracK_count_zone(self->sock, TEST_ZONE_ID + 2); ret = conntracK_count_zone(self->sock, TEST_ZONE_ID + 2);
EXPECT_EQ(ret, 2); EXPECT_EQ(ret, 2);
ret = conntracK_count_zone(self->sock, NF_CT_DEFAULT_ZONE_ID);
EXPECT_EQ(ret, 2);
}
TEST_F(conntrack_dump_flush, test_flush_by_zone_default)
{
int ret;
ret = conntrack_flush_zone(self->sock, NF_CT_DEFAULT_ZONE_ID);
EXPECT_EQ(ret, 0);
ret = conntracK_count_zone(self->sock, TEST_ZONE_ID);
EXPECT_EQ(ret, 2);
ret = conntracK_count_zone(self->sock, TEST_ZONE_ID + 1);
EXPECT_EQ(ret, 2);
ret = conntracK_count_zone(self->sock, TEST_ZONE_ID + 2);
EXPECT_EQ(ret, 2);
ret = conntracK_count_zone(self->sock, NF_CT_DEFAULT_ZONE_ID);
EXPECT_EQ(ret, 0);
} }
TEST_HARNESS_MAIN TEST_HARNESS_MAIN