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Sun, 26 Jan 2025 06:11:43 -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 v9 3/5] bpf: disable non stream socket for strparser In-Reply-To: <20250122100917.49845-4-mrpre@163.com> (Jiayuan Chen's message of "Wed, 22 Jan 2025 18:09:15 +0800") References: <20250122100917.49845-1-mrpre@163.com> <20250122100917.49845-4-mrpre@163.com> Date: Sun, 26 Jan 2025 15:11:42 +0100 Message-ID: <87jzahd5r5.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 Wed, Jan 22, 2025 at 06:09 PM +08, Jiayuan Chen wrote: > Currently, only TCP supports strparser, but sockmap doesn't intercept > non-TCP connections to attach strparser. For example, with UDP, although > the read/write handlers are replaced, strparser is not executed due to > the lack of a read_sock operation. > > Furthermore, in udp_bpf_recvmsg(), it checks whether the psock has data, > and if not, it falls back to the native UDP read interface, making > UDP + strparser appear to read correctly. According to its commit history, > this behavior is unexpected. > > Moreover, since UDP lacks the concept of streams, we intercept it directly. > > Fixes: 1fa1fe8ff161 ("bpf, sockmap: Test shutdown() correctly exits epoll and recv()=0") > Signed-off-by: Jiayuan Chen > --- Acked-by: Jakub Sitnicki