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Tue, 21 Jan 2025 06:23:02 -0800 (PST) From: Jakub Sitnicki To: Jiayuan Chen Cc: bpf@vger.kernel.org, john.fastabend@gmail.com, netdev@vger.kernel.org, martin.lau@linux.dev, ast@kernel.org, edumazet@google.com, davem@davemloft.net, dsahern@kernel.org, kuba@kernel.org, pabeni@redhat.com, linux-kernel@vger.kernel.org, song@kernel.org, andrii@kernel.org, mhal@rbox.co, yonghong.song@linux.dev, daniel@iogearbox.net, xiyou.wangcong@gmail.com, horms@kernel.org, corbet@lwn.net, eddyz87@gmail.com, cong.wang@bytedance.com, shuah@kernel.org, mykolal@fb.com, jolsa@kernel.org, haoluo@google.com, sdf@fomichev.me, kpsingh@kernel.org, linux-doc@vger.kernel.org, linux-kselftest@vger.kernel.org Subject: Re: [PATCH bpf v8 3/5] bpf: disable non stream socket for strparser In-Reply-To: <20250121050707.55523-4-mrpre@163.com> (Jiayuan Chen's message of "Tue, 21 Jan 2025 13:07:05 +0800") References: <20250121050707.55523-1-mrpre@163.com> <20250121050707.55523-4-mrpre@163.com> Date: Tue, 21 Jan 2025 15:23:00 +0100 Message-ID: <87wmeogsaj.fsf@cloudflare.com> Precedence: bulk X-Mailing-List: linux-doc@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain On Tue, Jan 21, 2025 at 01:07 PM +08, Jiayuan Chen wrote: > Currently, only TCP supports strparser, but sockmap doesn't intercept > non-TCP to attach strparser. For example, with UDP, although the > read/write handlers are replaced, strparser is not executed due to the > lack of read_sock operation. > > Furthermore, in udp_bpf_recvmsg(), it checks whether psock has data, and > if not, it falls back to the native UDP read interface, making > UDP + strparser appear to read correctly. According to it's commit Nit: typo, "its" > history, the behavior is unexpected. > > Moreover, since UDP lacks the concept of streams, we intercept it > directly. > > Signed-off-by: Jiayuan Chen > --- > net/core/sock_map.c | 5 ++++- > 1 file changed, 4 insertions(+), 1 deletion(-) > > diff --git a/net/core/sock_map.c b/net/core/sock_map.c > index f1b9b3958792..3b0f59d9b4db 100644 > --- a/net/core/sock_map.c > +++ b/net/core/sock_map.c > @@ -303,7 +303,10 @@ static int sock_map_link(struct bpf_map *map, struct sock *sk) > > write_lock_bh(&sk->sk_callback_lock); > if (stream_parser && stream_verdict && !psock->saved_data_ready) { > - ret = sk_psock_init_strp(sk, psock); > + if (sk_is_tcp(sk)) > + ret = sk_psock_init_strp(sk, psock); > + else > + ret = -EOPNOTSUPP; > if (ret) { > write_unlock_bh(&sk->sk_callback_lock); > sk_psock_put(sk, psock); Reviewed-by: Jakub Sitnicki