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From:   Xin Long <lucien.xin@gmail.com>
Date:   Wed, 27 Apr 2022 22:18:06 -0400
Message-ID: <CADvbK_fBafuWZq8wcxwyGFeS+YEuKfGrfs6igTR_ThhL+ZFDDQ@mail.gmail.com>
Subject: Re: [PATCH] rxrpc: Enable IPv6 checksums on transport socket
To:     David Howells <dhowells@redhat.com>
Cc:     marc.dionne@auristor.com, Vadim Fedorenko <vfedorenko@novek.ru>,
        "David S. Miller" <davem@davemloft.net>,
        linux-afs@lists.infradead.org, LKML <linux-kernel@vger.kernel.org>
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On Wed, Apr 27, 2022 at 5:30 PM David Howells <dhowells@redhat.com> wrote:
>
> AF_RXRPC doesn't currently enable IPv6 UDP Tx checksums on the transport
> socket it opens and the checksums in the packets it generates end up 0.
>
> It probably should also enable IPv6 UDP Rx checksums and IPv4 UDP
> checksums.  The latter only seem to be applied if the socket family is
> AF_INET and don't seem to apply if it's AF_INET6.  IPv4 packets from an
> IPv6 socket seem to have checksums anyway.
>
> What seems to have happened is that the inet_inv_convert_csum() call didn't
> get converted to the appropriate udp_port_cfg parameters - and
> udp_sock_create() disables checksums unless explicitly told not too.
>
> Fix this by enabling the three udp_port_cfg checksum options.
>
> Fixes: 1a9b86c9fd95 ("rxrpc: use udp tunnel APIs instead of open code in rxrpc_open_socket")
> Reported-by: Marc Dionne <marc.dionne@auristor.com>
> Signed-off-by: David Howells <dhowells@redhat.com>
> cc: Xin Long <lucien.xin@gmail.com>
> cc: Vadim Fedorenko <vfedorenko@novek.ru>
> cc: David S. Miller <davem@davemloft.net>
> cc: linux-afs@lists.infradead.org
> ---
>
>  net/rxrpc/local_object.c |    3 +++
>  1 file changed, 3 insertions(+)
>
> diff --git a/net/rxrpc/local_object.c b/net/rxrpc/local_object.c
> index a4111408ffd0..6a1611b0e303 100644
> --- a/net/rxrpc/local_object.c
> +++ b/net/rxrpc/local_object.c
> @@ -117,6 +117,7 @@ static int rxrpc_open_socket(struct rxrpc_local *local, struct net *net)
>                local, srx->transport_type, srx->transport.family);
>
>         udp_conf.family = srx->transport.family;
> +       udp_conf.use_udp_checksums = true;
>         if (udp_conf.family == AF_INET) {
>                 udp_conf.local_ip = srx->transport.sin.sin_addr;
>                 udp_conf.local_udp_port = srx->transport.sin.sin_port;
> @@ -124,6 +125,8 @@ static int rxrpc_open_socket(struct rxrpc_local *local, struct net *net)
>         } else {
>                 udp_conf.local_ip6 = srx->transport.sin6.sin6_addr;
>                 udp_conf.local_udp_port = srx->transport.sin6.sin6_port;
> +               udp_conf.use_udp6_tx_checksums = true;
> +               udp_conf.use_udp6_rx_checksums = true;
>  #endif
>         }
>         ret = udp_sock_create(net, &udp_conf, &local->socket);
>
>
Reviewed-by: Xin Long <lucien.xin@gmail.com>