On Sat, Oct 10, 2020 at 12:40 PM Willem de Bruijn
<willemdebruijn.ker...@gmail.com> wrote:
>
> On Thu, Oct 8, 2020 at 3:06 PM David Wilder <dwil...@us.ibm.com> wrote:
> >
> > Ingress large send packets are identified by either:
> > The IBMVETH_RXQ_LRG_PKT flag in the receive buffer
> > or with a -1 placed in the ip header checksum.
> > The method used depends on firmware version.
> >
> > Signed-off-by: David Wilder <dwil...@us.ibm.com>
> > Reviewed-by: Thomas Falcon <tlfal...@linux.ibm.com>
> > Reviewed-by: Cristobal Forno <cris.fo...@ibm.com>
> > Reviewed-by: Pradeep Satyanarayana <prade...@linux.vnet.ibm.com>
> > ---
> > drivers/net/ethernet/ibm/ibmveth.c | 13 ++++++++++++-
> > 1 file changed, 12 insertions(+), 1 deletion(-)
> >
> > diff --git a/drivers/net/ethernet/ibm/ibmveth.c
> > b/drivers/net/ethernet/ibm/ibmveth.c
> > index 3935a7e..e357cbe 100644
> > --- a/drivers/net/ethernet/ibm/ibmveth.c
> > +++ b/drivers/net/ethernet/ibm/ibmveth.c
> > @@ -1349,6 +1349,7 @@ static int ibmveth_poll(struct napi_struct *napi, int
> > budget)
> > int offset = ibmveth_rxq_frame_offset(adapter);
> > int csum_good = ibmveth_rxq_csum_good(adapter);
> > int lrg_pkt = ibmveth_rxq_large_packet(adapter);
> > + __sum16 iph_check = 0;
> >
> > skb = ibmveth_rxq_get_buffer(adapter);
> >
> > @@ -1385,7 +1386,17 @@ static int ibmveth_poll(struct napi_struct *napi,
> > int budget)
> > skb_put(skb, length);
> > skb->protocol = eth_type_trans(skb, netdev);
> >
> > - if (length > netdev->mtu + ETH_HLEN) {
> > + /* PHYP without PLSO support places a -1 in the ip
> > + * checksum for large send frames.
> > + */
> > + if (be16_to_cpu(skb->protocol) == ETH_P_IP) {
> > + struct iphdr *iph = (struct iphdr
> > *)skb->data;
> > +
> > + iph_check = iph->check;
>
> Check against truncated/bad packets.
.. unless I missed context. Other code in this driver seems to peek in
the network and transport layer headers without additional geometry
and integrity checks, too.
