From: Kuniyuki Iwashima <kuniyu@google.com>
To: Alexei Starovoitov <ast@kernel.org>,
Daniel Borkmann <daniel@iogearbox.net>,
Andrii Nakryiko <andrii@kernel.org>,
Martin KaFai Lau <martin.lau@linux.dev>,
Eduard Zingerman <eddyz87@gmail.com>,
Kumar Kartikeya Dwivedi <memxor@gmail.com>
Cc: Yonghong Song <yonghong.song@linux.dev>,
John Fastabend <john.fastabend@gmail.com>,
Stanislav Fomichev <sdf@fomichev.me>,
Eric Dumazet <edumazet@google.com>,
Neal Cardwell <ncardwell@google.com>,
Willem de Bruijn <willemb@google.com>,
Tenzin Ukyab <ukyab@berkeley.edu>,
Kuniyuki Iwashima <kuniyu@google.com>,
Kuniyuki Iwashima <kuni1840@gmail.com>,
bpf@vger.kernel.org, netdev@vger.kernel.org
Subject: [PATCH v2 bpf-next 07/11] bpf: mptcp: Don't support BPF_SOCK_OPS_RCVQ_CB.
Date: Fri, 22 May 2026 07:44:58 +0000 [thread overview]
Message-ID: <20260522074601.1658705-8-kuniyu@google.com> (raw)
In-Reply-To: <20260522074601.1658705-1-kuniyu@google.com>
MPTCP has its own sock->ops->set_rcvlowat() / mptcp_set_rcvlowat().
We should not allow calling __tcp_set_rcvlowat() for MPTCP subflows.
Let's disable BPF_SOCK_OPS_RCVQ_CB for MPTCP for now.
If needed in the future, bpf_sock_ops_tcp_set_rcvlowat() could be
extended to properly support MPTCP.
Signed-off-by: Kuniyuki Iwashima <kuniyu@google.com>
---
net/core/filter.c | 3 +++
1 file changed, 3 insertions(+)
diff --git a/net/core/filter.c b/net/core/filter.c
index ff7fd415486a..5913b3be9f1d 100644
--- a/net/core/filter.c
+++ b/net/core/filter.c
@@ -5392,6 +5392,9 @@ static int bpf_sock_ops_check_rcvq_cb(struct sock *sk, int val)
#endif
if (not_tcp_prot)
return -EBUSY;
+
+ if (unlikely(sk_is_mptcp(sk)))
+ return -EOPNOTSUPP;
}
return 0;
--
2.54.0.746.g67dd491aae-goog
next prev parent reply other threads:[~2026-05-22 7:46 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-05-22 7:44 [PATCH v2 bpf-next 00/11] bpf: Add SOCK_OPS hooks for TCP AutoLOWAT Kuniyuki Iwashima
2026-05-22 7:44 ` [PATCH v2 bpf-next 01/11] selftest: bpf: Use BPF_SOCK_OPS_ALL_CB_FLAGS + 1 for bad_cb_test_rv Kuniyuki Iwashima
2026-05-22 8:22 ` bot+bpf-ci
2026-05-22 7:44 ` [PATCH v2 bpf-next 02/11] bpf: tcp: Introduce BPF_SOCK_OPS_RCVQ_CB Kuniyuki Iwashima
2026-05-22 8:22 ` bot+bpf-ci
2026-05-22 7:44 ` [PATCH v2 bpf-next 03/11] bpf: tcp: Support bpf_skb_load_bytes() for BPF_SOCK_OPS_RCVQ_CB Kuniyuki Iwashima
2026-05-22 7:44 ` [PATCH v2 bpf-next 04/11] tcp: Split out __tcp_set_rcvlowat() Kuniyuki Iwashima
2026-05-22 7:44 ` [PATCH v2 bpf-next 05/11] bpf: tcp: Add kfunc to adjust sk->sk_rcvlowat Kuniyuki Iwashima
2026-05-22 8:22 ` bot+bpf-ci
2026-05-22 7:44 ` [PATCH v2 bpf-next 06/11] bpf: tcp: Make BPF_SOCK_OPS_RCVQ_CB and SOCKMAP mutually exclusive Kuniyuki Iwashima
2026-05-22 7:44 ` Kuniyuki Iwashima [this message]
2026-05-22 7:44 ` [PATCH v2 bpf-next 08/11] bpf: tcp: Reject BPF_SOCK_OPS_RCVQ_CB if receive queue is not empty Kuniyuki Iwashima
2026-05-22 7:45 ` [PATCH v2 bpf-next 09/11] bpf: tcp: Factorise bpf_skops_established() Kuniyuki Iwashima
2026-05-22 7:45 ` [PATCH v2 bpf-next 10/11] bpf: tcp: Add SOCK_OPS rcvlowat hook Kuniyuki Iwashima
2026-05-22 7:45 ` [PATCH v2 bpf-next 11/11] selftest: bpf: Add test for BPF_SOCK_OPS_RCVQ_CB Kuniyuki Iwashima
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