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[NET] gso: Fix up GSO packets with broken checksums

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Certain subsystems in the stack (e.g., netfilter) can break the partial
checksum on GSO packets.  Until they're fixed, this patch allows this to
work by recomputing the partial checksums through the GSO mechanism.

Once they've all been converted to update the partial checksum instead of
clearing it, this workaround can be removed.

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
2006-07-08 13:34:56 -07:00
committed by David S. Miller
parent 89114afd43
commit a430a43d08
8 changed files with 179 additions and 40 deletions
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19
net/ipv6/tcp_ipv6.c
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@@ -552,6 +552,24 @@ static void tcp_v6_send_check(struct sock *sk, int len, struct sk_buff *skb)
}
}
static int tcp_v6_gso_send_check(struct sk_buff *skb)
{
struct ipv6hdr *ipv6h;
struct tcphdr *th;
if (!pskb_may_pull(skb, sizeof(*th)))
return -EINVAL;
ipv6h = skb->nh.ipv6h;
th = skb->h.th;
th->check = 0;
th->check = ~csum_ipv6_magic(&ipv6h->saddr, &ipv6h->daddr, skb->len,
IPPROTO_TCP, 0);
skb->csum = offsetof(struct tcphdr, check);
skb->ip_summed = CHECKSUM_HW;
return 0;
}
static void tcp_v6_send_reset(struct sk_buff *skb)
{
@@ -1603,6 +1621,7 @@ struct proto tcpv6_prot = {
static struct inet6_protocol tcpv6_protocol = {
.handler = tcp_v6_rcv,
.err_handler = tcp_v6_err,
.gso_send_check = tcp_v6_gso_send_check,
.gso_segment = tcp_tso_segment,
.flags = INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL,
};