netdev - Re: [PATCH] inet_diag: add support for tw

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Date:   Wed, 16 Jun 2021 16:40:22 +1000
From:   Jonathan Maxwell <jmaxwell37@...il.com>
To:     Maciej Żenczykowski <zenczykowski@...il.com>
Cc:     Maciej Żenczykowski <maze@...gle.com>,
        Linux Network Development Mailing List 
        <netdev@...r.kernel.org>, "David S . Miller" <davem@...emloft.net>,
        Hideaki YOSHIFUJI <yoshfuji@...ux-ipv6.org>,
        David Ahern <dsahern@...nel.org>,
        Jakub Kicinski <kuba@...nel.org>,
        Eric Dumazet <edumazet@...gle.com>
Subject: Re: [PATCH] inet_diag: add support for tw_mark

On Wed, Jun 16, 2021 at 4:06 PM Maciej Żenczykowski
<zenczykowski@...il.com> wrote:
>
> From: Maciej Żenczykowski <maze@...gle.com>
>
> Timewait sockets have included mark since approx 4.18.
>
> Cc: Eric Dumazet <edumazet@...gle.com>
> Cc: Jon Maxwell <jmaxwell37@...il.com>
> Fixes: 00483690552c ("tcp: Add mark for TIMEWAIT sockets")
> Signed-off-by: Maciej Żenczykowski <maze@...gle.com>
> ---
>  net/ipv4/inet_diag.c | 12 ++++++++++--
>  1 file changed, 10 insertions(+), 2 deletions(-)
>
> diff --git a/net/ipv4/inet_diag.c b/net/ipv4/inet_diag.c
> index 93474b1bea4e..e65f4ef024a4 100644
> --- a/net/ipv4/inet_diag.c
> +++ b/net/ipv4/inet_diag.c
> @@ -416,7 +416,7 @@ EXPORT_SYMBOL_GPL(inet_sk_diag_fill);
>  static int inet_twsk_diag_fill(struct sock *sk,
>                                struct sk_buff *skb,
>                                struct netlink_callback *cb,
> -                              u16 nlmsg_flags)
> +                              u16 nlmsg_flags, bool net_admin)
>  {
>         struct inet_timewait_sock *tw = inet_twsk(sk);
>         struct inet_diag_msg *r;
> @@ -444,6 +444,12 @@ static int inet_twsk_diag_fill(struct sock *sk,
>         r->idiag_uid          = 0;
>         r->idiag_inode        = 0;
>
> +       if (net_admin && nla_put_u32(skb, INET_DIAG_MARK,
> +                                    tw->tw_mark)) {
> +               nlmsg_cancel(skb, nlh);
> +               return -EMSGSIZE;
> +       }
> +
>         nlmsg_end(skb, nlh);
>         return 0;
>  }
> @@ -494,7 +500,7 @@ static int sk_diag_fill(struct sock *sk, struct sk_buff *skb,
>                         u16 nlmsg_flags, bool net_admin)
>  {
>         if (sk->sk_state == TCP_TIME_WAIT)
> -               return inet_twsk_diag_fill(sk, skb, cb, nlmsg_flags);
> +               return inet_twsk_diag_fill(sk, skb, cb, nlmsg_flags, net_admin);
>
>         if (sk->sk_state == TCP_NEW_SYN_RECV)
>                 return inet_req_diag_fill(sk, skb, cb, nlmsg_flags, net_admin);
> @@ -801,6 +807,8 @@ int inet_diag_bc_sk(const struct nlattr *bc, struct sock *sk)
>                 entry.mark = sk->sk_mark;
>         else if (sk->sk_state == TCP_NEW_SYN_RECV)
>                 entry.mark = inet_rsk(inet_reqsk(sk))->ir_mark;
> +       else if (sk->sk_state == TCP_TIME_WAIT)
> +               entry.mark = inet_twsk(sk)->tw_mark;
>         else
>                 entry.mark = 0;
>  #ifdef CONFIG_SOCK_CGROUP_DATA
> --
> 2.32.0.272.g935e593368-goog
>

Thanks for adding that to the inet_diag module.

Reviewed-by: Jon Maxwell <jmaxwell37@...il.com>