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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
Download Patch File Download Diff File Expand all files Collapse all files

24
net/ipv4/tcp_ipv4.c
View File

@@ -1110,24 +1110,18 @@ static struct sock *tcp_v4_hnd_req(struct sock *sk, struct sk_buff *skb)
static int tcp_v4_checksum_init(struct sk_buff *skb)
{
if (skb->ip_summed == CHECKSUM_HW) {
skb->ip_summed = CHECKSUM_UNNECESSARY;
if (!tcp_v4_check(skb->h.th, skb->len, skb->nh.iph->saddr,
skb->nh.iph->daddr, skb->csum))
skb->nh.iph->daddr, skb->csum)) {
skb->ip_summed = CHECKSUM_UNNECESSARY;
return 0;
LIMIT_NETDEBUG(KERN_DEBUG "hw tcp v4 csum failed\n");
skb->ip_summed = CHECKSUM_NONE;
}
}
skb->csum = csum_tcpudp_nofold(skb->nh.iph->saddr, skb->nh.iph->daddr,
skb->len, IPPROTO_TCP, 0);
if (skb->len <= 76) {
if (tcp_v4_check(skb->h.th, skb->len, skb->nh.iph->saddr,
skb->nh.iph->daddr,
skb_checksum(skb, 0, skb->len, 0)))
return -1;
skb->ip_summed = CHECKSUM_UNNECESSARY;
} else {
skb->csum = ~tcp_v4_check(skb->h.th, skb->len,
skb->nh.iph->saddr,
skb->nh.iph->daddr, 0);
return __skb_checksum_complete(skb);
}
return 0;
}
@@ -1219,7 +1213,7 @@ int tcp_v4_rcv(struct sk_buff *skb)
* provided case of th->doff==0 is elimineted.
* So, we defer the checks. */
if ((skb->ip_summed != CHECKSUM_UNNECESSARY &&
tcp_v4_checksum_init(skb) < 0))
tcp_v4_checksum_init(skb)))
goto bad_packet;
th = skb->h.th;