* [PATCH net v3] net/sched: cls_flower: Reject invalid ct_state flags rules
@ 2021-02-05 7:07 wenxu
2021-02-06 20:51 ` Jakub Kicinski
0 siblings, 1 reply; 2+ messages in thread
From: wenxu @ 2021-02-05 7:07 UTC (permalink / raw)
To: kuba, mleitner; +Cc: netdev, jhs
From: wenxu <wenxu@ucloud.cn>
Reject the unsupported and invalid ct_state flags of cls flower rules.
Fixes: e0ace68af2ac ("net/sched: cls_flower: Add matching on conntrack info")
Signed-off-by: wenxu <wenxu@ucloud.cn>
---
v3: using NLA_POLICY_MASK and NL_SET_ERR_MSG_ATTR
include/uapi/linux/pkt_cls.h | 7 +++++++
net/sched/cls_flower.c | 33 ++++++++++++++++++++++++++++++++-
2 files changed, 39 insertions(+), 1 deletion(-)
diff --git a/include/uapi/linux/pkt_cls.h b/include/uapi/linux/pkt_cls.h
index ee95f42..77df582 100644
--- a/include/uapi/linux/pkt_cls.h
+++ b/include/uapi/linux/pkt_cls.h
@@ -591,8 +591,15 @@ enum {
TCA_FLOWER_KEY_CT_FLAGS_ESTABLISHED = 1 << 1, /* Part of an existing connection. */
TCA_FLOWER_KEY_CT_FLAGS_RELATED = 1 << 2, /* Related to an established connection. */
TCA_FLOWER_KEY_CT_FLAGS_TRACKED = 1 << 3, /* Conntrack has occurred. */
+
+ __TCA_FLOWER_KEY_CT_FLAGS_MAX,
};
+#define TCA_FLOWER_KEY_CT_FLAGS_MAX \
+ ((__TCA_FLOWER_KEY_CT_FLAGS_MAX - 1) << 1)
+#define TCA_FLOWER_KEY_CT_FLAGS_MASK \
+ (TCA_FLOWER_KEY_CT_FLAGS_MAX - 1)
+
enum {
TCA_FLOWER_KEY_ENC_OPTS_UNSPEC,
TCA_FLOWER_KEY_ENC_OPTS_GENEVE, /* Nested
diff --git a/net/sched/cls_flower.c b/net/sched/cls_flower.c
index 84f9325..4aebf4e 100644
--- a/net/sched/cls_flower.c
+++ b/net/sched/cls_flower.c
@@ -30,6 +30,9 @@
#include <uapi/linux/netfilter/nf_conntrack_common.h>
+#define TCA_FLOWER_KEY_CT_STATE_MASK_TYPE \
+ NLA_POLICY_MASK(NLA_U16, TCA_FLOWER_KEY_CT_FLAGS_MASK)
+
struct fl_flow_key {
struct flow_dissector_key_meta meta;
struct flow_dissector_key_control control;
@@ -687,7 +690,7 @@ static void *fl_get(struct tcf_proto *tp, u32 handle)
[TCA_FLOWER_KEY_ENC_OPTS] = { .type = NLA_NESTED },
[TCA_FLOWER_KEY_ENC_OPTS_MASK] = { .type = NLA_NESTED },
[TCA_FLOWER_KEY_CT_STATE] = { .type = NLA_U16 },
- [TCA_FLOWER_KEY_CT_STATE_MASK] = { .type = NLA_U16 },
+ [TCA_FLOWER_KEY_CT_STATE_MASK] = TCA_FLOWER_KEY_CT_STATE_MASK_TYPE,
[TCA_FLOWER_KEY_CT_ZONE] = { .type = NLA_U16 },
[TCA_FLOWER_KEY_CT_ZONE_MASK] = { .type = NLA_U16 },
[TCA_FLOWER_KEY_CT_MARK] = { .type = NLA_U32 },
@@ -1390,12 +1393,33 @@ static int fl_set_enc_opt(struct nlattr **tb, struct fl_flow_key *key,
return 0;
}
+static int fl_validate_ct_state(u16 state, struct nlattr *tb,
+ struct netlink_ext_ack *extack)
+{
+ if (state && !(state & TCA_FLOWER_KEY_CT_FLAGS_TRACKED)) {
+ NL_SET_ERR_MSG_ATTR(extack, tb,
+ "ct_state no trk, no other flag are set");
+ return -EINVAL;
+ }
+
+ if (state & TCA_FLOWER_KEY_CT_FLAGS_NEW &&
+ state & TCA_FLOWER_KEY_CT_FLAGS_ESTABLISHED) {
+ NL_SET_ERR_MSG_ATTR(extack, tb,
+ "ct_state new and est are exclusive");
+ return -EINVAL;
+ }
+
+ return 0;
+}
+
static int fl_set_key_ct(struct nlattr **tb,
struct flow_dissector_key_ct *key,
struct flow_dissector_key_ct *mask,
struct netlink_ext_ack *extack)
{
if (tb[TCA_FLOWER_KEY_CT_STATE]) {
+ int err;
+
if (!IS_ENABLED(CONFIG_NF_CONNTRACK)) {
NL_SET_ERR_MSG(extack, "Conntrack isn't enabled");
return -EOPNOTSUPP;
@@ -1403,6 +1427,13 @@ static int fl_set_key_ct(struct nlattr **tb,
fl_set_key_val(tb, &key->ct_state, TCA_FLOWER_KEY_CT_STATE,
&mask->ct_state, TCA_FLOWER_KEY_CT_STATE_MASK,
sizeof(key->ct_state));
+
+ err = fl_validate_ct_state(mask->ct_state,
+ tb[TCA_FLOWER_KEY_CT_STATE_MASK],
+ extack);
+ if (err)
+ return err;
+
}
if (tb[TCA_FLOWER_KEY_CT_ZONE]) {
if (!IS_ENABLED(CONFIG_NF_CONNTRACK_ZONES)) {
--
1.8.3.1
^ permalink raw reply related [flat|nested] 2+ messages in thread
* Re: [PATCH net v3] net/sched: cls_flower: Reject invalid ct_state flags rules
2021-02-05 7:07 [PATCH net v3] net/sched: cls_flower: Reject invalid ct_state flags rules wenxu
@ 2021-02-06 20:51 ` Jakub Kicinski
0 siblings, 0 replies; 2+ messages in thread
From: Jakub Kicinski @ 2021-02-06 20:51 UTC (permalink / raw)
To: wenxu; +Cc: mleitner, netdev, jhs
On Fri, 5 Feb 2021 15:07:30 +0800 wenxu@ucloud.cn wrote:
> From: wenxu <wenxu@ucloud.cn>
>
> Reject the unsupported and invalid ct_state flags of cls flower rules.
>
> Fixes: e0ace68af2ac ("net/sched: cls_flower: Add matching on conntrack info")
> Signed-off-by: wenxu <wenxu@ucloud.cn>
> ---
> v3: using NLA_POLICY_MASK and NL_SET_ERR_MSG_ATTR
>
> include/uapi/linux/pkt_cls.h | 7 +++++++
> net/sched/cls_flower.c | 33 ++++++++++++++++++++++++++++++++-
> 2 files changed, 39 insertions(+), 1 deletion(-)
>
> diff --git a/include/uapi/linux/pkt_cls.h b/include/uapi/linux/pkt_cls.h
> index ee95f42..77df582 100644
> --- a/include/uapi/linux/pkt_cls.h
> +++ b/include/uapi/linux/pkt_cls.h
> @@ -591,8 +591,15 @@ enum {
> TCA_FLOWER_KEY_CT_FLAGS_ESTABLISHED = 1 << 1, /* Part of an existing connection. */
> TCA_FLOWER_KEY_CT_FLAGS_RELATED = 1 << 2, /* Related to an established connection. */
> TCA_FLOWER_KEY_CT_FLAGS_TRACKED = 1 << 3, /* Conntrack has occurred. */
> +
> + __TCA_FLOWER_KEY_CT_FLAGS_MAX,
> };
>
> +#define TCA_FLOWER_KEY_CT_FLAGS_MAX \
> + ((__TCA_FLOWER_KEY_CT_FLAGS_MAX - 1) << 1)
> +#define TCA_FLOWER_KEY_CT_FLAGS_MASK \
> + (TCA_FLOWER_KEY_CT_FLAGS_MAX - 1)
This calculation is rather complicated, sorry I missed this the first
time around. And I don't think it needs to be in the uAPI.
> enum {
> TCA_FLOWER_KEY_ENC_OPTS_UNSPEC,
> TCA_FLOWER_KEY_ENC_OPTS_GENEVE, /* Nested
> diff --git a/net/sched/cls_flower.c b/net/sched/cls_flower.c
> index 84f9325..4aebf4e 100644
> --- a/net/sched/cls_flower.c
> +++ b/net/sched/cls_flower.c
> @@ -30,6 +30,9 @@
>
> #include <uapi/linux/netfilter/nf_conntrack_common.h>
We can add a define here:
#define TCA_FLOWER_KEY_CT_FLAGS_MASK (TCA_FLOWER_KEY_CT_FLAGS_NEW | \
TCA_FLOWER_KEY_CT_FLAGS_ESTABLISHED
...
> +#define TCA_FLOWER_KEY_CT_STATE_MASK_TYPE \
> + NLA_POLICY_MASK(NLA_U16, TCA_FLOWER_KEY_CT_FLAGS_MASK)
nit: using a define for policy is also uncommon AFAIK..
> struct fl_flow_key {
> struct flow_dissector_key_meta meta;
> struct flow_dissector_key_control control;
> @@ -687,7 +690,7 @@ static void *fl_get(struct tcf_proto *tp, u32 handle)
> [TCA_FLOWER_KEY_ENC_OPTS] = { .type = NLA_NESTED },
> [TCA_FLOWER_KEY_ENC_OPTS_MASK] = { .type = NLA_NESTED },
> [TCA_FLOWER_KEY_CT_STATE] = { .type = NLA_U16 },
> - [TCA_FLOWER_KEY_CT_STATE_MASK] = { .type = NLA_U16 },
> + [TCA_FLOWER_KEY_CT_STATE_MASK] = TCA_FLOWER_KEY_CT_STATE_MASK_TYPE,
.. if the line would be long just go to the next one:
[TCA_FLOWER_KEY_CT_STATE_MASK] =
NLA_POLICY_MASK(NLA_U16, TCA_FLOWER_KEY_CT_FLAGS_MASK)
> [TCA_FLOWER_KEY_CT_ZONE] = { .type = NLA_U16 },
> [TCA_FLOWER_KEY_CT_ZONE_MASK] = { .type = NLA_U16 },
> [TCA_FLOWER_KEY_CT_MARK] = { .type = NLA_U32 },
^ permalink raw reply [flat|nested] 2+ messages in thread
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2021-02-05 7:07 [PATCH net v3] net/sched: cls_flower: Reject invalid ct_state flags rules wenxu
2021-02-06 20:51 ` Jakub Kicinski
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