netdev - Re: [PATCH v1 net-next 1/5] inet6: Remove inet6_destroy_sock() in sk->sk

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Date:   Wed, 19 Oct 2022 15:22:40 +0200
From:   Matthieu Baerts <matthieu.baerts@...sares.net>
To:     Kuniyuki Iwashima <kuniyu@...zon.com>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        David Ahern <dsahern@...nel.org>,
        Hideaki YOSHIFUJI <yoshfuji@...ux-ipv6.org>
Cc:     Kuniyuki Iwashima <kuni1840@...il.com>, netdev@...r.kernel.org,
        Mat Martineau <mathew.j.martineau@...ux.intel.com>,
        MPTCP Upstream <mptcp@...ts.linux.dev>
Subject: Re: [PATCH v1 net-next 1/5] inet6: Remove inet6_destroy_sock() in
 sk->sk_prot->destroy().

Hi Kuniyuki,

+cc MPTCP ML.

On 18/10/2022 21:09, Kuniyuki Iwashima wrote:
> After commit d38afeec26ed ("tcp/udp: Call inet6_destroy_sock()
> in IPv6 sk->sk_destruct()."), we call inet6_destroy_sock() in
> sk->sk_destruct() by setting inet6_sock_destruct() to it to make
> sure we do not leak inet6-specific resources.
> 
> Now we can remove unnecessary inet6_destroy_sock() calls in
> sk->sk_prot->destroy().
> 
> DCCP and SCTP have their own sk->sk_destruct() function, so we
> change them separately in the following patches.
> 
> Signed-off-by: Kuniyuki Iwashima <kuniyu@...zon.com>
> ---
> Cc: Mat Martineau <mathew.j.martineau@...ux.intel.com>
> Cc: Matthieu Baerts <matthieu.baerts@...sares.net>

Thank you for the cc!
Please next time also cc MPTCP ML if you don't mind.

(...)

> diff --git a/net/mptcp/protocol.c b/net/mptcp/protocol.c
> index f599ad44ed24..7cc9c542c768 100644
> --- a/net/mptcp/protocol.c
> +++ b/net/mptcp/protocol.c
> @@ -17,9 +17,6 @@
>  #include <net/protocol.h>
>  #include <net/tcp.h>
>  #include <net/tcp_states.h>
> -#if IS_ENABLED(CONFIG_MPTCP_IPV6)
> -#include <net/transp_v6.h>
> -#endif

Please keep this include: it is needed to access "tcpv6_prot" (as
reported by the kernel bot).

>  #include <net/mptcp.h>
>  #include <net/xfrm.h>
>  #include <asm/ioctls.h>
> @@ -3898,12 +3895,6 @@ static const struct proto_ops mptcp_v6_stream_ops = {
>  
>  static struct proto mptcp_v6_prot;
>  
> -static void mptcp_v6_destroy(struct sock *sk)
> -{
> -	mptcp_destroy(sk);
> -	inet6_destroy_sock(sk);
> -}
> -
>  static struct inet_protosw mptcp_v6_protosw = {
>  	.type		= SOCK_STREAM,
>  	.protocol	= IPPROTO_MPTCP,
> @@ -3919,7 +3910,6 @@ int __init mptcp_proto_v6_init(void)
>  	mptcp_v6_prot = mptcp_prot;
>  	strcpy(mptcp_v6_prot.name, "MPTCPv6");
>  	mptcp_v6_prot.slab = NULL;
> -	mptcp_v6_prot.destroy = mptcp_v6_destroy;
>  	mptcp_v6_prot.obj_size = sizeof(struct mptcp6_sock);
>  
>  	err = proto_register(&mptcp_v6_prot, 1);

I see that for MPTCP IPv6 sockets, sk->sk_destruct is now set to
inet6_sock_destruct() which calls inet6_destroy_sock() via
inet6_cleanup_sock().

So all good for the MPTCP part (if you re-add the include ;) ).

Cheers,
Matt
-- 
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