From: Jason Wang <jasowang@redhat.com>
To: David Woodhouse <dwmw2@infradead.org>, netdev@vger.kernel.org
Cc: "Eugenio Pérez" <eperezma@redhat.com>,
"Willem de Bruijn" <willemb@google.com>
Subject: Re: [PATCH v3 2/5] net: tun: don't assume IFF_VNET_HDR in tun_xdp_one() tx path
Date: Fri, 25 Jun 2021 14:58:32 +0800 [thread overview]
Message-ID: <3fb5a99a-52bb-0a47-0ea6-531104db5838@redhat.com> (raw)
In-Reply-To: <20210624123005.1301761-2-dwmw2@infradead.org>
在 2021/6/24 下午8:30, David Woodhouse 写道:
> From: David Woodhouse <dwmw@amazon.co.uk>
>
> Sometimes it's just a data packet. The virtio_net_hdr processing should be
> conditional on IFF_VNET_HDR, just as it is in tun_get_user().
>
> Fixes: 043d222f93ab ("tuntap: accept an array of XDP buffs through sendmsg()")
> Signed-off-by: David Woodhouse <dwmw@amazon.co.uk>
Acked-by: Jason Wang <jasowang@redhat.com>
> ---
> drivers/net/tun.c | 9 ++++++---
> 1 file changed, 6 insertions(+), 3 deletions(-)
>
> diff --git a/drivers/net/tun.c b/drivers/net/tun.c
> index 67b406fa0881..9acd448e6dfc 100644
> --- a/drivers/net/tun.c
> +++ b/drivers/net/tun.c
> @@ -2331,7 +2331,7 @@ static int tun_xdp_one(struct tun_struct *tun,
> {
> unsigned int datasize = xdp->data_end - xdp->data;
> struct tun_xdp_hdr *hdr = xdp->data_hard_start;
> - struct virtio_net_hdr *gso = &hdr->gso;
> + struct virtio_net_hdr *gso = NULL;
> struct bpf_prog *xdp_prog;
> struct sk_buff *skb = NULL;
> u32 rxhash = 0, act;
> @@ -2340,9 +2340,12 @@ static int tun_xdp_one(struct tun_struct *tun,
> bool skb_xdp = false;
> struct page *page;
>
> + if (tun->flags & IFF_VNET_HDR)
> + gso = &hdr->gso;
> +
> xdp_prog = rcu_dereference(tun->xdp_prog);
> if (xdp_prog) {
> - if (gso->gso_type) {
> + if (gso && gso->gso_type) {
> skb_xdp = true;
> goto build;
> }
> @@ -2388,7 +2391,7 @@ static int tun_xdp_one(struct tun_struct *tun,
> skb_reserve(skb, xdp->data - xdp->data_hard_start);
> skb_put(skb, xdp->data_end - xdp->data);
>
> - if (virtio_net_hdr_to_skb(skb, gso, tun_is_little_endian(tun))) {
> + if (gso && virtio_net_hdr_to_skb(skb, gso, tun_is_little_endian(tun))) {
> atomic_long_inc(&tun->rx_frame_errors);
> kfree_skb(skb);
> err = -EINVAL;
next prev parent reply other threads:[~2021-06-25 6:58 UTC|newest]
Thread overview: 73+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-06-19 13:33 [PATCH] net: tun: fix tun_xdp_one() for IFF_TUN mode David Woodhouse
2021-06-21 7:00 ` Jason Wang
2021-06-21 10:52 ` David Woodhouse
2021-06-21 14:50 ` David Woodhouse
2021-06-21 20:43 ` David Woodhouse
2021-06-22 4:52 ` Jason Wang
2021-06-22 7:24 ` David Woodhouse
2021-06-22 7:51 ` Jason Wang
2021-06-22 8:10 ` David Woodhouse
2021-06-22 11:36 ` David Woodhouse
2021-06-22 4:34 ` Jason Wang
2021-06-22 4:34 ` Jason Wang
2021-06-22 7:28 ` David Woodhouse
2021-06-22 8:00 ` Jason Wang
2021-06-22 8:29 ` David Woodhouse
2021-06-23 3:39 ` Jason Wang
2021-06-24 12:39 ` David Woodhouse
2021-06-22 16:15 ` [PATCH v2 1/4] " David Woodhouse
2021-06-22 16:15 ` [PATCH v2 2/4] net: tun: don't assume IFF_VNET_HDR in tun_xdp_one() tx path David Woodhouse
2021-06-23 3:46 ` Jason Wang
2021-06-22 16:15 ` [PATCH v2 3/4] vhost_net: validate virtio_net_hdr only if it exists David Woodhouse
2021-06-23 3:48 ` Jason Wang
2021-06-22 16:15 ` [PATCH v2 4/4] vhost_net: Add self test with tun device David Woodhouse
2021-06-23 4:02 ` Jason Wang
2021-06-23 16:12 ` David Woodhouse
2021-06-24 6:12 ` Jason Wang
2021-06-24 10:42 ` David Woodhouse
2021-06-25 2:55 ` Jason Wang
2021-06-25 7:54 ` David Woodhouse
2021-06-23 3:45 ` [PATCH v2 1/4] net: tun: fix tun_xdp_one() for IFF_TUN mode Jason Wang
2021-06-23 8:30 ` David Woodhouse
2021-06-23 13:52 ` David Woodhouse
2021-06-23 17:31 ` David Woodhouse
2021-06-23 22:52 ` David Woodhouse
2021-06-24 6:37 ` Jason Wang
2021-06-24 7:23 ` David Woodhouse
2021-06-24 6:18 ` Jason Wang
2021-06-24 7:05 ` David Woodhouse
2021-06-24 12:30 ` [PATCH v3 1/5] net: add header len parameter to tun_get_socket(), tap_get_socket() David Woodhouse
2021-06-24 12:30 ` [PATCH v3 2/5] net: tun: don't assume IFF_VNET_HDR in tun_xdp_one() tx path David Woodhouse
2021-06-25 6:58 ` Jason Wang [this message]
2021-06-24 12:30 ` [PATCH v3 3/5] vhost_net: remove virtio_net_hdr validation, let tun/tap do it themselves David Woodhouse
2021-06-25 7:33 ` Jason Wang
2021-06-25 8:37 ` David Woodhouse
2021-06-28 4:23 ` Jason Wang
2021-06-28 11:23 ` David Woodhouse
2021-06-28 23:29 ` David Woodhouse
2021-06-29 3:43 ` Jason Wang
2021-06-29 6:59 ` David Woodhouse
2021-06-29 10:49 ` David Woodhouse
2021-06-29 13:15 ` David Woodhouse
2021-06-30 4:39 ` Jason Wang
2021-06-30 10:02 ` David Woodhouse
2021-07-01 4:13 ` Jason Wang
2021-07-01 17:39 ` David Woodhouse
2021-07-02 3:13 ` Jason Wang
2021-07-02 8:08 ` David Woodhouse
2021-07-02 8:50 ` Jason Wang
2021-07-09 15:04 ` Eugenio Perez Martin
2021-06-29 3:21 ` Jason Wang
2021-06-24 12:30 ` [PATCH v3 4/5] net: tun: fix tun_xdp_one() for IFF_TUN mode David Woodhouse
2021-06-25 7:41 ` Jason Wang
2021-06-25 8:51 ` David Woodhouse
2021-06-28 4:27 ` Jason Wang
2021-06-28 10:43 ` David Woodhouse
2021-06-25 18:43 ` Willem de Bruijn
2021-06-25 19:00 ` David Woodhouse
2021-06-24 12:30 ` [PATCH v3 5/5] vhost_net: Add self test with tun device David Woodhouse
2021-06-25 5:00 ` [PATCH v3 1/5] net: add header len parameter to tun_get_socket(), tap_get_socket() Jason Wang
2021-06-25 8:23 ` David Woodhouse
2021-06-28 4:22 ` Jason Wang
2021-06-25 18:13 ` Willem de Bruijn
2021-06-25 18:55 ` David Woodhouse
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