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[NET]: Detect hardware rx checksum faults correctly

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Here is the patch that introduces the generic skb_checksum_complete
which also checks for hardware RX checksum faults.  If that happens,
it'll call netdev_rx_csum_fault which currently prints out a stack
trace with the device name.  In future it can turn off RX checksum.

I've converted every spot under net/ that does RX checksum checks to
use skb_checksum_complete or __skb_checksum_complete with the
exceptions of:

* Those places where checksums are done bit by bit.  These will call
netdev_rx_csum_fault directly.

* The following have not been completely checked/converted:

ipmr
ip_vs
netfilter
dccp

This patch is based on patches and suggestions from Stephen Hemminger
and David S. Miller.

Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Herbert Xu
2005-11-10 13:01:24 -08:00
committed by David S. Miller
parent 1064e944d0
commit fb286bb299
19 changed files with 173 additions and 134 deletions
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19
net/ipv4/igmp.c
View File

@@ -872,11 +872,18 @@ int igmp_rcv(struct sk_buff *skb)
return 0;
}
if (!pskb_may_pull(skb, sizeof(struct igmphdr)) ||
(u16)csum_fold(skb_checksum(skb, 0, len, 0))) {
in_dev_put(in_dev);
kfree_skb(skb);
return 0;
if (!pskb_may_pull(skb, sizeof(struct igmphdr)))
goto drop;
switch (skb->ip_summed) {
case CHECKSUM_HW:
if (!(u16)csum_fold(skb->csum))
break;
/* fall through */
case CHECKSUM_NONE:
skb->csum = 0;
if (__skb_checksum_complete(skb))
goto drop;
}
ih = skb->h.igmph;
@@ -906,6 +913,8 @@ int igmp_rcv(struct sk_buff *skb)
default:
NETDEBUG(KERN_DEBUG "New IGMP type=%d, why we do not know about it?\n", ih->type);
}
drop:
in_dev_put(in_dev);
kfree_skb(skb);
return 0;