netdev - Re: [PATCH bpf-next] bpf: support SO_DEBUG in bpf

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Date:   Sun, 3 Feb 2019 23:37:21 +0000
From:   Lawrence Brakmo <brakmo@...com>
To:     Yafang Shao <laoar.shao@...il.com>, Martin Lau <kafai@...com>,
        "ast@...nel.org" <ast@...nel.org>,
        "daniel@...earbox.net" <daniel@...earbox.net>
CC:     "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "shaoyafang@...iglobal.com" <shaoyafang@...iglobal.com>
Subject: Re: [PATCH bpf-next] bpf: support SO_DEBUG in bpf_setsockopt()

On 2/3/19, 12:15 AM, "Yafang Shao" <laoar.shao@...il.com> wrote:

    Then we can enable/disable socket debugging without modifying user code.
    That is more convenient for debugging.
    
    Signed-off-by: Yafang Shao <laoar.shao@...il.com>

Acked-by: Lawrence Brakmo <brakmo@...com>

    ---
     include/net/sock.h | 8 ++++++++
     net/core/filter.c  | 3 +++
     net/core/sock.c    | 8 --------
     3 files changed, 11 insertions(+), 8 deletions(-)
    
    diff --git a/include/net/sock.h b/include/net/sock.h
    index 2b229f7..8decee9 100644
    --- a/include/net/sock.h
    +++ b/include/net/sock.h
    @@ -1935,6 +1935,14 @@ static inline void sock_confirm_neigh(struct sk_buff *skb, struct neighbour *n)
     	}
     }
     
    +static inline void sock_valbool_flag(struct sock *sk, int bit, int valbool)
    +{
    +	if (valbool)
    +		sock_set_flag(sk, bit);
    +	else
    +		sock_reset_flag(sk, bit);
    +}
    +
     bool sk_mc_loop(struct sock *sk);
     
     static inline bool sk_can_gso(const struct sock *sk)
    diff --git a/net/core/filter.c b/net/core/filter.c
    index 3a49f68..ce5da57 100644
    --- a/net/core/filter.c
    +++ b/net/core/filter.c
    @@ -4111,6 +4111,9 @@ static unsigned long bpf_xdp_copy(void *dst_buff, const void *src_buff,
     
     		/* Only some socketops are supported */
     		switch (optname) {
    +		case SO_DEBUG:
    +			sock_valbool_flag(sk, SOCK_DBG, val);
    +			break;
     		case SO_RCVBUF:
     			sk->sk_userlocks |= SOCK_RCVBUF_LOCK;
     			sk->sk_rcvbuf = max_t(int, val * 2, SOCK_MIN_RCVBUF);
    diff --git a/net/core/sock.c b/net/core/sock.c
    index 900e8a9..5ef6daa 100644
    --- a/net/core/sock.c
    +++ b/net/core/sock.c
    @@ -638,14 +638,6 @@ static int sock_getbindtodevice(struct sock *sk, char __user *optval,
     	return ret;
     }
     
    -static inline void sock_valbool_flag(struct sock *sk, int bit, int valbool)
    -{
    -	if (valbool)
    -		sock_set_flag(sk, bit);
    -	else
    -		sock_reset_flag(sk, bit);
    -}
    -
     bool sk_mc_loop(struct sock *sk)
     {
     	if (dev_recursion_level())
    -- 
    1.8.3.1