netdev - Re: [PATCH net-next v7 10/11] tcp: make dropreason in tcp_child

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Date: Thu, 22 Feb 2024 10:25:26 +0800
From: Jason Xing <kerneljasonxing@...il.com>
To: Eric Dumazet <edumazet@...gle.com>
Cc: davem@...emloft.net, kuba@...nel.org, pabeni@...hat.com, 
	dsahern@...nel.org, kuniyu@...zon.com, netdev@...r.kernel.org, 
	Jason Xing <kernelxing@...cent.com>
Subject: Re: [PATCH net-next v7 10/11] tcp: make dropreason in
 tcp_child_process() work

On Wed, Feb 21, 2024 at 10:44 PM Eric Dumazet <edumazet@...gle.com> wrote:
>
> On Wed, Feb 21, 2024 at 3:58 AM Jason Xing <kerneljasonxing@...il.com> wrote:
> >
> > From: Jason Xing <kernelxing@...cent.com>
> >
> > It's time to let it work right now. We've already prepared for this:)
> >
> > Signed-off-by: Jason Xing <kernelxing@...cent.com>
> > --
> > v7
> > Link: https://lore.kernel.org/all/20240219043815.98410-1-kuniyu@amazon.com/
> > 1. adjust the related part of code only since patch [04/11] is changed.
> > ---
> >  net/ipv4/tcp_ipv4.c | 16 ++++++++++------
> >  net/ipv6/tcp_ipv6.c | 20 +++++++++++++-------
> >  2 files changed, 23 insertions(+), 13 deletions(-)
> >
> > diff --git a/net/ipv4/tcp_ipv4.c b/net/ipv4/tcp_ipv4.c
> > index c79e25549972..c886c671fae9 100644
> > --- a/net/ipv4/tcp_ipv4.c
> > +++ b/net/ipv4/tcp_ipv4.c
> > @@ -1917,7 +1917,8 @@ int tcp_v4_do_rcv(struct sock *sk, struct sk_buff *skb)
> >                 if (!nsk)
> >                         return 0;
> >                 if (nsk != sk) {
> > -                       if (tcp_child_process(sk, nsk, skb)) {
> > +                       reason = tcp_child_process(sk, nsk, skb);
> > +                       if (reason) {
> >                                 rsk = nsk;
> >                                 goto reset;
> >                         }
> > @@ -2276,12 +2277,15 @@ int tcp_v4_rcv(struct sk_buff *skb)
> >                 if (nsk == sk) {
> >                         reqsk_put(req);
> >                         tcp_v4_restore_cb(skb);
> > -               } else if (tcp_child_process(sk, nsk, skb)) {
> > -                       tcp_v4_send_reset(nsk, skb);
> > -                       goto discard_and_relse;
> >                 } else {
> > -                       sock_put(sk);
> > -                       return 0;
> > +                       drop_reason = tcp_child_process(sk, nsk, skb);
> > +                       if (drop_reason) {
> > +                               tcp_v4_send_reset(nsk, skb);
> > +                               goto discard_and_relse;
> > +                       } else {
>
> No need for else after a goto (or a return)

Thanks, I will do it soon.

>
> > +                               sock_put(sk);
> > +                               return 0;
> > +                       }
> >                 }
> >         }
> >
> > diff --git a/net/ipv6/tcp_ipv6.c b/net/ipv6/tcp_ipv6.c
> > index 4f8464e04b7f..f260c28e5b18 100644
> > --- a/net/ipv6/tcp_ipv6.c
> > +++ b/net/ipv6/tcp_ipv6.c
> > @@ -1654,8 +1654,11 @@ int tcp_v6_do_rcv(struct sock *sk, struct sk_buff *skb)
> >                 struct sock *nsk = tcp_v6_cookie_check(sk, skb);
> >
> >                 if (nsk != sk) {
> > -                       if (nsk && tcp_child_process(sk, nsk, skb))
> > -                               goto reset;
> > +                       if (nsk) {
> > +                               reason = tcp_child_process(sk, nsk, skb);
> > +                               if (reason)
> > +                                       goto reset;
> > +                       }
> >                         if (opt_skb)
> >                                 __kfree_skb(opt_skb);
> >                         return 0;
> > @@ -1854,12 +1857,15 @@ INDIRECT_CALLABLE_SCOPE int tcp_v6_rcv(struct sk_buff *skb)
> >                 if (nsk == sk) {
> >                         reqsk_put(req);
> >                         tcp_v6_restore_cb(skb);
> > -               } else if (tcp_child_process(sk, nsk, skb)) {
> > -                       tcp_v6_send_reset(nsk, skb);
> > -                       goto discard_and_relse;
> >                 } else {
> > -                       sock_put(sk);
> > -                       return 0;
> > +                       drop_reason = tcp_child_process(sk, nsk, skb);
> > +                       if (drop_reason) {
> > +                               tcp_v6_send_reset(nsk, skb);
> > +                               goto discard_and_relse;
> > +                       } else {
>
>
>  Same here

Got it.

>
> > +                               sock_put(sk);
> > +                               return 0;
> > +                       }
> >                 }
> >         }
> >
> > --
> > 2.37.3
> >