diff mbox series

[net,3/6] net/sched: Reserve TC_H_INGRESS (TC_H_CLSACT) for ingress (clsact) Qdiscs

Message ID 9969180f9219ed18656d8f3c92e717f6eb398aa1.1683326865.git.peilin.ye@bytedance.com
State New
Headers
Series net/sched: Fixes for sch_ingress and sch_clsact |

Commit Message

Peilin Ye May 6, 2023, 12:14 a.m. UTC 
  Currently it is possible to add e.g. an HTB Qdisc under ffff:fff1
(TC_H_INGRESS, TC_H_CLSACT):

  $ ip link add name ifb0 type ifb
  $ tc qdisc add dev ifb0 parent ffff:fff1 htb
  $ tc qdisc add dev ifb0 clsact
  Error: Exclusivity flag on, cannot modify.
  $ drgn
  ...
  >>> ifb0 = netdev_get_by_name(prog, "ifb0")
  >>> qdisc = ifb0.ingress_queue.qdisc_sleeping
  >>> print(qdisc.ops.id.string_().decode())
  htb
  >>> qdisc.flags.value_() # TCQ_F_INGRESS
  2

Only allow ingress and clsact Qdiscs under ffff:fff1.  Return -EINVAL
for everything else.  Make TCQ_F_INGRESS a static flag of ingress and
clsact Qdiscs.

Fixes: 1da177e4c3f4 ("Linux-2.6.12-rc2")
Fixes: 1f211a1b929c ("net, sched: add clsact qdisc")
Signed-off-by: Peilin Ye <peilin.ye@bytedance.com>
---
 net/sched/sch_api.c     | 7 ++++++-
 net/sched/sch_ingress.c | 4 ++--
 2 files changed, 8 insertions(+), 3 deletions(-)

Comments

Jamal Hadi Salim May 8, 2023, 11:23 a.m. UTC | #1 
On Fri, May 5, 2023 at 8:14 PM Peilin Ye <yepeilin.cs@gmail.com> wrote:
>
> Currently it is possible to add e.g. an HTB Qdisc under ffff:fff1
> (TC_H_INGRESS, TC_H_CLSACT):
>
>   $ ip link add name ifb0 type ifb
>   $ tc qdisc add dev ifb0 parent ffff:fff1 htb
>   $ tc qdisc add dev ifb0 clsact
>   Error: Exclusivity flag on, cannot modify.
>   $ drgn
>   ...
>   >>> ifb0 = netdev_get_by_name(prog, "ifb0")
>   >>> qdisc = ifb0.ingress_queue.qdisc_sleeping
>   >>> print(qdisc.ops.id.string_().decode())
>   htb
>   >>> qdisc.flags.value_() # TCQ_F_INGRESS
>   2
>
> Only allow ingress and clsact Qdiscs under ffff:fff1.  Return -EINVAL
> for everything else.  Make TCQ_F_INGRESS a static flag of ingress and
> clsact Qdiscs.
>
> Fixes: 1da177e4c3f4 ("Linux-2.6.12-rc2")
> Fixes: 1f211a1b929c ("net, sched: add clsact qdisc")
> Signed-off-by: Peilin Ye <peilin.ye@bytedance.com>

Reviewed-by: Jamal Hadi Salim <jhs@mojatatu.com>
Acked-by: Jamal Hadi Salim <jhs@mojatatu.com>


cheers,
jamal

> ---
>  net/sched/sch_api.c     | 7 ++++++-
>  net/sched/sch_ingress.c | 4 ++--
>  2 files changed, 8 insertions(+), 3 deletions(-)
>
> diff --git a/net/sched/sch_api.c b/net/sched/sch_api.c
> index fdb8f429333d..383195955b7d 100644
> --- a/net/sched/sch_api.c
> +++ b/net/sched/sch_api.c
> @@ -1252,7 +1252,12 @@ static struct Qdisc *qdisc_create(struct net_device *dev,
>         sch->parent = parent;
>
>         if (handle == TC_H_INGRESS) {
> -               sch->flags |= TCQ_F_INGRESS;
> +               if (!(sch->flags & TCQ_F_INGRESS)) {
> +                       NL_SET_ERR_MSG(extack,
> +                                      "Specified parent ID is reserved for ingress and clsact Qdiscs");
> +                       err = -EINVAL;
> +                       goto err_out3;
> +               }
>                 handle = TC_H_MAKE(TC_H_INGRESS, 0);
>         } else {
>                 if (handle == 0) {
> diff --git a/net/sched/sch_ingress.c b/net/sched/sch_ingress.c
> index 13218a1fe4a5..caea51e0d4e9 100644
> --- a/net/sched/sch_ingress.c
> +++ b/net/sched/sch_ingress.c
> @@ -137,7 +137,7 @@ static struct Qdisc_ops ingress_qdisc_ops __read_mostly = {
>         .cl_ops                 =       &ingress_class_ops,
>         .id                     =       "ingress",
>         .priv_size              =       sizeof(struct ingress_sched_data),
> -       .static_flags           =       TCQ_F_CPUSTATS,
> +       .static_flags           =       TCQ_F_INGRESS | TCQ_F_CPUSTATS,
>         .init                   =       ingress_init,
>         .destroy                =       ingress_destroy,
>         .dump                   =       ingress_dump,
> @@ -275,7 +275,7 @@ static struct Qdisc_ops clsact_qdisc_ops __read_mostly = {
>         .cl_ops                 =       &clsact_class_ops,
>         .id                     =       "clsact",
>         .priv_size              =       sizeof(struct clsact_sched_data),
> -       .static_flags           =       TCQ_F_CPUSTATS,
> +       .static_flags           =       TCQ_F_INGRESS | TCQ_F_CPUSTATS,
>         .init                   =       clsact_init,
>         .destroy                =       clsact_destroy,
>         .dump                   =       ingress_dump,
> --
> 2.20.1
>
diff mbox series

Patch

diff --git a/net/sched/sch_api.c b/net/sched/sch_api.c
index fdb8f429333d..383195955b7d 100644
--- a/net/sched/sch_api.c
+++ b/net/sched/sch_api.c
@@ -1252,7 +1252,12 @@  static struct Qdisc *qdisc_create(struct net_device *dev,
 	sch->parent = parent;
 
 	if (handle == TC_H_INGRESS) {
-		sch->flags |= TCQ_F_INGRESS;
+		if (!(sch->flags & TCQ_F_INGRESS)) {
+			NL_SET_ERR_MSG(extack,
+				       "Specified parent ID is reserved for ingress and clsact Qdiscs");
+			err = -EINVAL;
+			goto err_out3;
+		}
 		handle = TC_H_MAKE(TC_H_INGRESS, 0);
 	} else {
 		if (handle == 0) {
diff --git a/net/sched/sch_ingress.c b/net/sched/sch_ingress.c
index 13218a1fe4a5..caea51e0d4e9 100644
--- a/net/sched/sch_ingress.c
+++ b/net/sched/sch_ingress.c
@@ -137,7 +137,7 @@  static struct Qdisc_ops ingress_qdisc_ops __read_mostly = {
 	.cl_ops			=	&ingress_class_ops,
 	.id			=	"ingress",
 	.priv_size		=	sizeof(struct ingress_sched_data),
-	.static_flags		=	TCQ_F_CPUSTATS,
+	.static_flags		=	TCQ_F_INGRESS | TCQ_F_CPUSTATS,
 	.init			=	ingress_init,
 	.destroy		=	ingress_destroy,
 	.dump			=	ingress_dump,
@@ -275,7 +275,7 @@  static struct Qdisc_ops clsact_qdisc_ops __read_mostly = {
 	.cl_ops			=	&clsact_class_ops,
 	.id			=	"clsact",
 	.priv_size		=	sizeof(struct clsact_sched_data),
-	.static_flags		=	TCQ_F_CPUSTATS,
+	.static_flags		=	TCQ_F_INGRESS | TCQ_F_CPUSTATS,
 	.init			=	clsact_init,
 	.destroy		=	clsact_destroy,
 	.dump			=	ingress_dump,