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virtio: Implement skb_partial_csum_set, for setting partial csums on untrusted packets.

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Use it in virtio_net (replacing buggy version there), it's also going
to be used by TAP for partial csum support.

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
Acked-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Rusty Russell
2008-02-04 23:49:54 -05:00
parent 9135f1901e
commit f35d9d8aae
3 changed files with 31 additions and 10 deletions
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11
drivers/net/virtio_net.c
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@@ -83,17 +83,8 @@ static void receive_skb(struct net_device *dev, struct sk_buff *skb,
if (hdr->flags & VIRTIO_NET_HDR_F_NEEDS_CSUM) {
pr_debug("Needs csum!\n");
skb->ip_summed = CHECKSUM_PARTIAL;
skb->csum_start = hdr->csum_start;
skb->csum_offset = hdr->csum_offset;
if (skb->csum_start > skb->len - 2
|| skb->csum_offset > skb->len - 2) {
if (net_ratelimit())
printk(KERN_WARNING "%s: csum=%u/%u len=%u\n",
dev->name, skb->csum_start,
skb->csum_offset, skb->len);
if (!skb_partial_csum_set(skb,hdr->csum_start,hdr->csum_offset))
goto frame_err;
}
}
if (hdr->gso_type != VIRTIO_NET_HDR_GSO_NONE) {