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Date:   Fri, 12 Jun 2020 15:54:48 -0700
From:   John Fastabend <john.fastabend@...il.com>
To:     Jakub Sitnicki <jakub@...udflare.com>,
        Lorenz Bauer <lmb@...udflare.com>
Cc:     John Fastabend <john.fastabend@...il.com>,
        Daniel Borkmann <daniel@...earbox.net>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Alexei Starovoitov <ast@...nel.org>,
        kernel-team@...udflare.com, netdev@...r.kernel.org,
        bpf@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH bpf] bpf: sockmap: don't attach programs to UDP sockets

Jakub Sitnicki wrote:
> On Thu, 11 Jun 2020 18:25:20 +0100
> Lorenz Bauer <lmb@...udflare.com> wrote:
> 
> > The stream parser infrastructure isn't set up to deal with UDP
> > sockets, so we mustn't try to attach programs to them.
> > 
> > I remember making this change at some point, but I must have lost
> > it while rebasing or something similar.
> > 
> > Fixes: 7b98cd42b049 ("bpf: sockmap: Add UDP support")
> > Signed-off-by: Lorenz Bauer <lmb@...udflare.com>
> > ---
> >  net/core/sock_map.c | 10 ++++++----
> >  1 file changed, 6 insertions(+), 4 deletions(-)
> > 
> > diff --git a/net/core/sock_map.c b/net/core/sock_map.c
> > index 00a26cf2cfe9..35cea36f3892 100644
> > --- a/net/core/sock_map.c
> > +++ b/net/core/sock_map.c
> > @@ -424,10 +424,7 @@ static int sock_map_get_next_key(struct bpf_map *map, void *key, void *next)
> >  	return 0;
> >  }
> >  
> > -static bool sock_map_redirect_allowed(const struct sock *sk)
> > -{
> > -	return sk->sk_state != TCP_LISTEN;
> > -}
> > +static bool sock_map_redirect_allowed(const struct sock *sk);
> >  
> >  static int sock_map_update_common(struct bpf_map *map, u32 idx,
> >  				  struct sock *sk, u64 flags)
> > @@ -508,6 +505,11 @@ static bool sk_is_udp(const struct sock *sk)
> >  	       sk->sk_protocol == IPPROTO_UDP;
> >  }
> >  
> > +static bool sock_map_redirect_allowed(const struct sock *sk)
> > +{
> > +	return sk_is_tcp(sk) && sk->sk_state != TCP_LISTEN;
> > +}
> > +
> >  static bool sock_map_sk_is_suitable(const struct sock *sk)
> >  {
> >  	return sk_is_tcp(sk) || sk_is_udp(sk);
> 
> Acked-by: Jakub Sitnicki <jakub@...udflare.com>

Thanks.

Acked-by: John Fastabend <john.fastabend@...il.com>

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