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 <mr...@163.com>
> ---
>  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 <ja...@cloudflare.com>

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