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gro: Fix COMPLETE checksum handling

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On a brand new GRO skb, we cannot call ip_hdr since the header
may lie in the non-linear area.  This patch adds the helper
skb_gro_network_header to handle this.

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 2009-04-27 05:44:45 -07:00 committed by David S. Miller
parent edbd9e3030
commit 36e7b1b8da
3 changed files with 9 additions and 2 deletions
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7
include/linux/netdevice.h
View file

@ -1142,6 +1142,13 @@ static inline void *skb_gro_mac_header(struct sk_buff *skb)
skb_shinfo(skb)->frags[0].page_offset;
}
static inline void *skb_gro_network_header(struct sk_buff *skb)
{
return skb_headlen(skb) ? skb_network_header(skb) :
page_address(skb_shinfo(skb)->frags[0].page) +
skb_shinfo(skb)->frags[0].page_offset + skb_network_offset(skb);
}
static inline int dev_hard_header(struct sk_buff *skb, struct net_device *dev,
unsigned short type,
const void *daddr, const void *saddr,

2
net/ipv4/tcp_ipv4.c
View file

@ -2343,7 +2343,7 @@ void tcp4_proc_exit(void)
struct sk_buff **tcp4_gro_receive(struct sk_buff **head, struct sk_buff *skb)
{
struct iphdr *iph = ip_hdr(skb);
struct iphdr *iph = skb_gro_network_header(skb);
switch (skb->ip_summed) {
case CHECKSUM_COMPLETE:

2
net/ipv6/tcp_ipv6.c
View file

@ -943,7 +943,7 @@ static int tcp_v6_gso_send_check(struct sk_buff *skb)
struct sk_buff **tcp6_gro_receive(struct sk_buff **head, struct sk_buff *skb)
{
struct ipv6hdr *iph = ipv6_hdr(skb);
struct ipv6hdr *iph = skb_gro_network_header(skb);
switch (skb->ip_summed) {
case CHECKSUM_COMPLETE: