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authorPravin B Shelar <pshelar@nicira.com>2013-06-17 17:49:45 -0700
committerDavid S. Miller <davem@davemloft.net>2013-06-19 18:07:40 -0700
commit752f36da68e9136df8918461d651723a43627e04 (patch)
tree4701b050f7b67559162f935d4fbb626597738ee1 /net/ipv4/ip_gre.c
parentbda7bb46343647f68591366731295a0f3eea59ed (diff)
downloadop-kernel-dev-752f36da68e9136df8918461d651723a43627e04.zip
op-kernel-dev-752f36da68e9136df8918461d651723a43627e04.tar.gz
gre: export gre_build_header() function.
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>
Diffstat (limited to 'net/ipv4/ip_gre.c')
-rw-r--r--net/ipv4/ip_gre.c40
1 files changed, 1 insertions, 39 deletions
diff --git a/net/ipv4/ip_gre.c b/net/ipv4/ip_gre.c
index 19863a8..362c7c4 100644
--- a/net/ipv4/ip_gre.c
+++ b/net/ipv4/ip_gre.c
@@ -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);
}
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