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Message-Id: <1371147863-9205-1-git-send-email-pshelar@nicira.com>
Date: Thu, 13 Jun 2013 11:24:23 -0700
From: Pravin B Shelar <pshelar@...ira.com>
To: netdev@...r.kernel.org, dev@...nvswitch.org
Cc: Pravin B Shelar <pshelar@...ira.com>
Subject: [PATCH net-next 03/12] gre: export gre_build_header() function.
This is required for ovs gre module.
Signed-off-by: Pravin B Shelar <pshelar@...ira.com>
---
include/net/gre.h | 2 ++
net/ipv4/gre.c | 32 ++++++++++++++++++++++++++++++++
net/ipv4/ip_gre.c | 40 +---------------------------------------
3 files changed, 35 insertions(+), 39 deletions(-)
diff --git a/include/net/gre.h b/include/net/gre.h
index c6ea0c7..cbb9d51 100644
--- a/include/net/gre.h
+++ b/include/net/gre.h
@@ -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)
{
diff --git a/net/ipv4/gre.c b/net/ipv4/gre.c
index 8b9a373..1cbc465 100644
--- a/net/ipv4/gre.c
+++ b/net/ipv4/gre.c
@@ -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;
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);
}
--
1.7.1
--
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