On 8/29/25 5:23 AM, Yafang Shao wrote:

On Thu, Aug 28, 2025 at 3:55 PM Paolo Abeni [off-list ref] wrote:

quoted

On 8/22/25 8:42 AM, Yafang Shao wrote:

quoted

During recent testing with the netem qdisc to inject delays into TCP
traffic, we observed that our CLS BPF program failed to function correctly
due to incorrect classid retrieval from task_get_classid(). The issue
manifests in the following call stack:

         bpf_get_cgroup_classid+5
         cls_bpf_classify+507
         __tcf_classify+90
         tcf_classify+217
         __dev_queue_xmit+798
         bond_dev_queue_xmit+43
         __bond_start_xmit+211
         bond_start_xmit+70
         dev_hard_start_xmit+142
         sch_direct_xmit+161
         __qdisc_run+102             <<<<< Issue location
         __dev_xmit_skb+1015
         __dev_queue_xmit+637
         neigh_hh_output+159
         ip_finish_output2+461
         __ip_finish_output+183
         ip_finish_output+41
         ip_output+120
         ip_local_out+94
         __ip_queue_xmit+394
         ip_queue_xmit+21
         __tcp_transmit_skb+2169
         tcp_write_xmit+959
         __tcp_push_pending_frames+55
         tcp_push+264
         tcp_sendmsg_locked+661
         tcp_sendmsg+45
         inet_sendmsg+67
         sock_sendmsg+98
         sock_write_iter+147
         vfs_write+786
         ksys_write+181
         __x64_sys_write+25
         do_syscall_64+56
         entry_SYSCALL_64_after_hwframe+100

The problem occurs when multiple tasks share a single qdisc. In such cases,
__qdisc_run() may transmit skbs created by different tasks. Consequently,
task_get_classid() retrieves an incorrect classid since it references the
current task's context rather than the skb's originating task.

Given that dev_queue_xmit() always executes with bh disabled, we can safely
use in_softirq() instead of in_serving_softirq() to properly identify the
softirq context and obtain the correct classid.

The simple steps to reproduce this issue:
1. Add network delay to the network interface:
   such as: tc qdisc add dev bond0 root netem delay 1.5ms
2. Create two distinct net_cls cgroups, each running a network-intensive task
3. Initiate parallel TCP streams from both tasks to external servers.

Under this specific condition, the issue reliably occurs. The kernel
eventually dequeues an SKB that originated from Task-A while executing in
the context of Task-B.

Signed-off-by: Yafang Shao <redacted>
Cc: Daniel Borkmann <daniel@iogearbox.net>
Cc: Thomas Graf <tgraf@suug.ch>
Cc: Sebastian Andrzej Siewior <bigeasy@linutronix.de>

v1->v2: use softirq_count() instead of in_softirq()
---
  include/net/cls_cgroup.h | 2 +-
  1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/include/net/cls_cgroup.h b/include/net/cls_cgroup.h
index 7e78e7d6f015..668aeee9b3f6 100644
--- a/include/net/cls_cgroup.h
+++ b/include/net/cls_cgroup.h

@@ -63,7 +63,7 @@ static inline u32 task_get_classid(const struct sk_buff *skb)
        * calls by looking at the number of nested bh disable calls because
        * softirqs always disables bh.
        */
-     if (in_serving_softirq()) {
+     if (softirq_count()) {
               struct sock *sk = skb_to_full_sk(skb);

               /* If there is an sock_cgroup_classid we'll use that. */

AFAICS the above changes the established behavior for a slightly
different scenario:

right.

quoted

<sock S is created by task A>
<class ID for task A is changed>
<skb is created by sock S xmit and classified>

prior to this patch the skb will be classified with the 'new' task A
classid, now with the old/original one.

I'm unsure if such behavior change is acceptable;

The classid of a skb is only meaningful within its original network
context, not from a random task.

Do you mean by original network context original netns? We also have
bpf_skb_cgroup_classid() as well as bpf_get_cgroup_classid_curr(), both
exposed to tcx, which kind of detangles what task_get_classid() is doing.
I guess if you have apps in its own netns and the skb->sk is retained all
the way to phys dev in hostns then bpf_skb_cgroup_classid() might be a
better choice (assuming classid stays constant from container orchestrator
PoV).

quoted

I think at very least
it should be mentioned in the changelog and likely this change should
target net-next.

Will add this to the commit log and tag it for net-next in the next version.