6.13-stable review patch. If anyone has any objections, please let me know.
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From: Jiayuan Chen mrpre@163.com
[ Upstream commit 5459cce6bf49e72ee29be21865869c2ac42419f5 ]
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 mrpre@163.com Signed-off-by: Martin KaFai Lau martin.lau@kernel.org Acked-by: Jakub Sitnicki jakub@cloudflare.com Acked-by: John Fastabend john.fastabend@gmail.com Link: https://patch.msgid.link/20250122100917.49845-4-mrpre@163.com Signed-off-by: Sasha Levin sashal@kernel.org --- 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 2f1be9baad057..82a14f131d00c 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);