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gre: export gre_build_header() function.

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This is required for ovs gre module.

Signed-off-by: Pravin B Shelar <pshelar@nicira.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Pravin B Shelar 2013-06-17 17:49:45 -07:00 committed by David S. Miller
parent bda7bb4634
commit 752f36da68
3 changed files with 35 additions and 39 deletions
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2
include/net/gre.h
View File

@ -32,6 +32,8 @@ struct gre_cisco_protocol {
int gre_cisco_register(struct gre_cisco_protocol *proto);
int gre_cisco_unregister(struct gre_cisco_protocol *proto);
void gre_build_header(struct sk_buff *skb, const struct tnl_ptk_info *tpi,
int hdr_len);
static inline int ip_gre_calc_hlen(__be16 o_flags)
{

32
net/ipv4/gre.c
View File

@ -61,6 +61,38 @@ int gre_del_protocol(const struct gre_protocol *proto, u8 version)
}
EXPORT_SYMBOL_GPL(gre_del_protocol);
void gre_build_header(struct sk_buff *skb, const struct tnl_ptk_info *tpi,
int hdr_len)
{
struct gre_base_hdr *greh;
skb_push(skb, hdr_len);
greh = (struct gre_base_hdr *)skb->data;
greh->flags = tnl_flags_to_gre_flags(tpi->flags);
greh->protocol = tpi->proto;
if (tpi->flags&(TUNNEL_KEY|TUNNEL_CSUM|TUNNEL_SEQ)) {
__be32 *ptr = (__be32 *)(((u8 *)greh) + hdr_len - 4);
if (tpi->flags&TUNNEL_SEQ) {
*ptr = tpi->seq;
ptr--;
}
if (tpi->flags&TUNNEL_KEY) {
*ptr = tpi->key;
ptr--;
}
if (tpi->flags&TUNNEL_CSUM &&
!(skb_shinfo(skb)->gso_type & SKB_GSO_GRE)) {
*ptr = 0;
*(__sum16 *)ptr = csum_fold(skb_checksum(skb, 0,
skb->len, 0));
}
}
}
EXPORT_SYMBOL_GPL(gre_build_header);
static __sum16 check_checksum(struct sk_buff *skb)
{
__sum16 csum = 0;

40
net/ipv4/ip_gre.c
View File

@ -248,40 +248,6 @@ error:
return ERR_PTR(err);
}
static struct sk_buff *gre_build_header(struct sk_buff *skb,
const struct tnl_ptk_info *tpi,
int hdr_len)
{
struct gre_base_hdr *greh;
skb_push(skb, hdr_len);
greh = (struct gre_base_hdr *)skb->data;
greh->flags = tnl_flags_to_gre_flags(tpi->flags);
greh->protocol = tpi->proto;
if (tpi->flags&(TUNNEL_KEY|TUNNEL_CSUM|TUNNEL_SEQ)) {
__be32 *ptr = (__be32 *)(((u8 *)greh) + hdr_len - 4);
if (tpi->flags&TUNNEL_SEQ) {
*ptr = tpi->seq;
ptr--;
}
if (tpi->flags&TUNNEL_KEY) {
*ptr = tpi->key;
ptr--;
}
if (tpi->flags&TUNNEL_CSUM &&
!(skb_shinfo(skb)->gso_type & SKB_GSO_GRE)) {
*(__sum16 *)ptr = 0;
*(__sum16 *)ptr = csum_fold(skb_checksum(skb, 0,
skb->len, 0));
}
}
return skb;
}
static void __gre_xmit(struct sk_buff *skb, struct net_device *dev,
const struct iphdr *tnl_params,
__be16 proto)
@ -302,11 +268,7 @@ static void __gre_xmit(struct sk_buff *skb, struct net_device *dev,
tpi.seq = htonl(tunnel->o_seqno);
/* Push GRE header. */
skb = gre_build_header(skb, &tpi, tunnel->hlen);
if (unlikely(!skb)) {
dev->stats.tx_dropped++;
return;
}
gre_build_header(skb, &tpi, tunnel->hlen);
ip_tunnel_xmit(skb, dev, tnl_params, tnl_params->protocol);
}