From mboxrd@z Thu Jan 1 00:00:00 1970 From: YOSHIFUJI Hideaki Subject: Re: [PATCH] firewire net: Ensure checksumming in upper layer. Date: Sun, 20 Jan 2013 19:37:09 +0900 Message-ID: <50FBC8D5.50205@linux-ipv6.org> References: <50FBA02C.9030203@linux-ipv6.org> <20130120105058.1aee26c4@stein> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Cc: linux1394-devel@lists.sourceforge.net, netdev@vger.kernel.org, linux-kernel@vger.kernel.org, YOSHIFUJI Hideaki To: Stefan Richter Return-path: In-Reply-To: <20130120105058.1aee26c4@stein> Sender: linux-kernel-owner@vger.kernel.org List-Id: netdev.vger.kernel.org Stefan Richter wrote: > On Jan 20 YOSHIFUJI Hideaki wrote: >> It is wrong to set skb->ip_summed to CHECKSUM_UNNECESSARY unless >> the device has already checked it. >> >> Signed-off-by: YOSHIFUJI Hideaki >> --- >> drivers/firewire/net.c | 2 +- >> 1 file changed, 1 insertion(+), 1 deletion(-) >> >> diff --git a/drivers/firewire/net.c b/drivers/firewire/net.c >> index e7a711f5..df6a1ca 100644 >> --- a/drivers/firewire/net.c >> +++ b/drivers/firewire/net.c >> @@ -520,7 +520,7 @@ static int fwnet_finish_incoming_packet(struct net_device *net, >> dev = netdev_priv(net); >> /* Write metadata, and then pass to the receive level */ >> skb->dev = net; >> - skb->ip_summed = CHECKSUM_UNNECESSARY; /* don't check it */ >> + skb->ip_summed = CHECKSUM_NONE; >> >> /* >> * Parse the encapsulation header. This actually does the job of > > Indeed neither the device nor the lower drivers check protocol checksums. > But the CRCs of the encapsulating 1394 packets are checked in hardware. > Shall protocol checksums be verified regardless? Yes, because packets may come from off-link source. --yoshfuji