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udp: additional GRO support

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Implement GRO for UDPv6. Add UDP checksum verification in gro_receive
for both UDP4 and UDP6 calling skb_gro_checksum_validate_zero_check.

Signed-off-by: Tom Herbert <therbert@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Tom Herbert
2014-08-22 13:34:44 -07:00
committed by David S. Miller
parent 149d0774a7
commit 57c67ff4bd
4 changed files with 96 additions and 17 deletions
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33
net/ipv6/udp_offload.c
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@@ -10,6 +10,7 @@
* UDPv6 GSO support
*/
#include <linux/skbuff.h>
#include <linux/netdevice.h>
#include <net/protocol.h>
#include <net/ipv6.h>
#include <net/udp.h>
@@ -127,10 +128,42 @@ static struct sk_buff *udp6_ufo_fragment(struct sk_buff *skb,
out:
return segs;
}
static struct sk_buff **udp6_gro_receive(struct sk_buff **head,
struct sk_buff *skb)
{
struct udphdr *uh = udp_gro_udphdr(skb);
/* Don't bother verifying checksum if we're going to flush anyway. */
if (unlikely(!uh) ||
(!NAPI_GRO_CB(skb)->flush &&
skb_gro_checksum_validate_zero_check(skb, IPPROTO_UDP, uh->check,
ip6_gro_compute_pseudo))) {
NAPI_GRO_CB(skb)->flush = 1;
return NULL;
}
return udp_gro_receive(head, skb, uh);
}
int udp6_gro_complete(struct sk_buff *skb, int nhoff)
{
const struct ipv6hdr *ipv6h = ipv6_hdr(skb);
struct udphdr *uh = (struct udphdr *)(skb->data + nhoff);
if (uh->check)
uh->check = ~udp_v6_check(skb->len - nhoff, &ipv6h->saddr,
&ipv6h->daddr, 0);
return udp_gro_complete(skb, nhoff);
}
static const struct net_offload udpv6_offload = {
.callbacks = {
.gso_send_check = udp6_ufo_send_check,
.gso_segment = udp6_ufo_fragment,
.gro_receive = udp6_gro_receive,
.gro_complete = udp6_gro_complete,
},
};