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Message-ID: <b5133e4e-4562-1ea0-9d46-c5fb74528ec8@gmail.com>
Date: Wed, 27 May 2020 09:42:57 -0700
From: Eric Dumazet <eric.dumazet@...il.com>
To: Dmitry Yakunin <zeil@...dex-team.ru>, davem@...emloft.net,
brakmo@...com
Cc: bpf@...r.kernel.org, netdev@...r.kernel.org
Subject: Re: [PATCH bpf-next] bpf: add SO_KEEPALIVE and related options to
bpf_setsockopt
On 5/27/20 8:05 AM, Dmitry Yakunin wrote:
> This patch adds support of SO_KEEPALIVE flag and TCP related options
> to bpf_setsockopt() routine. This is helpful if we want to enable or tune
> TCP keepalive for applications which don't do it in the userspace code.
> In order to avoid copy-paste, common code from classic setsockopt was moved
> to auxiliary functions in the headers.
Please split this in two patches :
- one adding the helpers, a pure TCP patch.
- one for BPF additions.
>
> Signed-off-by: Dmitry Yakunin <zeil@...dex-team.ru>
> ---
> include/net/sock.h | 9 +++++++++
> include/net/tcp.h | 18 ++++++++++++++++++
> net/core/filter.c | 39 ++++++++++++++++++++++++++++++++++++++-
> net/core/sock.c | 9 ---------
> net/ipv4/tcp.c | 15 ++-------------
> 5 files changed, 67 insertions(+), 23 deletions(-)
>
> diff --git a/include/net/sock.h b/include/net/sock.h
> index 3e8c6d4..ee35dea 100644
> --- a/include/net/sock.h
> +++ b/include/net/sock.h
> @@ -879,6 +879,15 @@ static inline void sock_reset_flag(struct sock *sk, enum sock_flags flag)
> __clear_bit(flag, &sk->sk_flags);
> }
>
> +static inline void sock_valbool_flag(struct sock *sk, enum sock_flags bit,
> + int valbool)
> +{
> + if (valbool)
> + sock_set_flag(sk, bit);
> + else
> + sock_reset_flag(sk, bit);
> +}
> +
> static inline bool sock_flag(const struct sock *sk, enum sock_flags flag)
> {
> return test_bit(flag, &sk->sk_flags);
> diff --git a/include/net/tcp.h b/include/net/tcp.h
> index b681338..ae6a495 100644
> --- a/include/net/tcp.h
> +++ b/include/net/tcp.h
> @@ -1465,6 +1465,24 @@ static inline u32 keepalive_time_elapsed(const struct tcp_sock *tp)
> tcp_jiffies32 - tp->rcv_tstamp);
> }
>
> +/* val must be validated at the top level function */
> +static inline void keepalive_time_set(struct tcp_sock *tp, int val)
> +{
> + struct sock *sk = (struct sock *)tp;
We prefer the other way to avoid a cast unless really needed :
static inline tcp_keepalive_time_set(struct sock *sk, int val)
{
stuct tcp_sock *tp = tcp_sk(sk);
> +
> + tp->keepalive_time = val * HZ;
> + if (sock_flag(sk, SOCK_KEEPOPEN) &&
> + !((1 << sk->sk_state) & (TCPF_CLOSE | TCPF_LISTEN))) {
> + u32 elapsed = keepalive_time_elapsed(tp);
> +
> + if (tp->keepalive_time > elapsed)
> + elapsed = tp->keepalive_time - elapsed;
> + else
> + elapsed = 0;
> + inet_csk_reset_keepalive_timer(sk, elapsed);
> + }
> +}
> +
> static inline int tcp_fin_time(const struct sock *sk)
> {
> int fin_timeout = tcp_sk(sk)->linger2 ? : sock_net(sk)->ipv4.sysctl_tcp_fin_timeout;
> diff --git a/net/core/filter.c b/net/core/filter.c
> index a6fc234..1035e43 100644
> --- a/net/core/filter.c
> +++ b/net/core/filter.c
> @@ -4248,8 +4248,8 @@ static const struct bpf_func_proto bpf_get_socket_uid_proto = {
> static int _bpf_setsockopt(struct sock *sk, int level, int optname,
> char *optval, int optlen, u32 flags)
> {
> + int val, valbool;
> int ret = 0;
> - int val;
>
> if (!sk_fullsock(sk))
> return -EINVAL;
> @@ -4260,6 +4260,7 @@ static int _bpf_setsockopt(struct sock *sk, int level, int optname,
> if (optlen != sizeof(int))
> return -EINVAL;
> val = *((int *)optval);
> + valbool = val ? 1 : 0;
>
> /* Only some socketops are supported */
> switch (optname) {
> @@ -4298,6 +4299,11 @@ static int _bpf_setsockopt(struct sock *sk, int level, int optname,
> sk_dst_reset(sk);
> }
> break;
> + case SO_KEEPALIVE:
> + if (sk->sk_prot->keepalive)
> + sk->sk_prot->keepalive(sk, valbool);
> + sock_valbool_flag(sk, SOCK_KEEPOPEN, valbool);
> + break;
> default:
> ret = -EINVAL;
> }
> @@ -4358,6 +4364,7 @@ static int _bpf_setsockopt(struct sock *sk, int level, int optname,
> ret = tcp_set_congestion_control(sk, name, false,
> reinit, true);
> } else {
> + struct inet_connection_sock *icsk = inet_csk(sk);
> struct tcp_sock *tp = tcp_sk(sk);
>
> if (optlen != sizeof(int))
> @@ -4386,6 +4393,36 @@ static int _bpf_setsockopt(struct sock *sk, int level, int optname,
> else
> tp->save_syn = val;
> break;
> + case TCP_KEEPIDLE:
> + if (val < 1 || val > MAX_TCP_KEEPIDLE)
> + ret = -EINVAL;
> + else
> + keepalive_time_set(tp, val);
> + break;
> + case TCP_KEEPINTVL:
> + if (val < 1 || val > MAX_TCP_KEEPINTVL)
> + ret = -EINVAL;
> + else
> + tp->keepalive_intvl = val * HZ;
> + break;
> + case TCP_KEEPCNT:
> + if (val < 1 || val > MAX_TCP_KEEPCNT)
> + ret = -EINVAL;
> + else
> + tp->keepalive_probes = val;
> + break;
> + case TCP_SYNCNT:
> + if (val < 1 || val > MAX_TCP_SYNCNT)
> + ret = -EINVAL;
> + else
> + icsk->icsk_syn_retries = val;
> + break;
> + case TCP_USER_TIMEOUT:
> + if (val < 0)
> + ret = -EINVAL;
> + else
> + icsk->icsk_user_timeout = val;
> + break;
> default:
> ret = -EINVAL;
> }
> diff --git a/net/core/sock.c b/net/core/sock.c
> index fd85e65..9836b01 100644
> --- a/net/core/sock.c
> +++ b/net/core/sock.c
> @@ -684,15 +684,6 @@ static int sock_getbindtodevice(struct sock *sk, char __user *optval,
> return ret;
> }
>
> -static inline void sock_valbool_flag(struct sock *sk, enum sock_flags 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())
> diff --git a/net/ipv4/tcp.c b/net/ipv4/tcp.c
> index 9700649..7b239e8 100644
> --- a/net/ipv4/tcp.c
> +++ b/net/ipv4/tcp.c
> @@ -3003,19 +3003,8 @@ static int do_tcp_setsockopt(struct sock *sk, int level,
> case TCP_KEEPIDLE:
> if (val < 1 || val > MAX_TCP_KEEPIDLE)
> err = -EINVAL;
> - else {
> - tp->keepalive_time = val * HZ;
> - if (sock_flag(sk, SOCK_KEEPOPEN) &&
> - !((1 << sk->sk_state) &
> - (TCPF_CLOSE | TCPF_LISTEN))) {
> - u32 elapsed = keepalive_time_elapsed(tp);
> - if (tp->keepalive_time > elapsed)
> - elapsed = tp->keepalive_time - elapsed;
> - else
> - elapsed = 0;
> - inet_csk_reset_keepalive_timer(sk, elapsed);
> - }
> - }
> + else
> + keepalive_time_set(tp, val);
> break;
> case TCP_KEEPINTVL:
> if (val < 1 || val > MAX_TCP_KEEPINTVL)
>
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