1 files changed, 170 insertions, 0 deletions
diff --git a/datapath/linux-2.6/compat-2.6/include/linux/skbuff.h b/datapath/linux-2.6/compat-2.6/include/linux/skbuff.h
new file mode 100644
index 000000000..666ef8504
--- /dev/null
+++ b/datapath/linux-2.6/compat-2.6/include/linux/skbuff.h
@@ -0,0 +1,170 @@
+#ifndef __LINUX_SKBUFF_WRAPPER_H
+#define __LINUX_SKBUFF_WRAPPER_H 1
+
+#include_next <linux/skbuff.h>
+
+#include <linux/version.h>
+
+#ifndef HAVE_SKB_COPY_FROM_LINEAR_DATA_OFFSET
+static inline void skb_copy_from_linear_data_offset(const struct sk_buff *skb,
+                                                    const int offset, void *to,
+                                                    const unsigned int len)
+{
+	memcpy(to, skb->data + offset, len);
+}
+
+static inline void skb_copy_to_linear_data_offset(struct sk_buff *skb,
+                                                  const int offset,
+                                                  const void *from,
+                                                  const unsigned int len)
+{
+	memcpy(skb->data + offset, from, len);
+}
+
+#endif	/* !HAVE_SKB_COPY_FROM_LINEAR_DATA_OFFSET */
+
+/*
+ * The networking layer reserves some headroom in skb data (via
+ * dev_alloc_skb). This is used to avoid having to reallocate skb data when
+ * the header has to grow. In the default case, if the header has to grow
+ * 16 bytes or less we avoid the reallocation.
+ *
+ * Unfortunately this headroom changes the DMA alignment of the resulting
+ * network packet. As for NET_IP_ALIGN, this unaligned DMA is expensive
+ * on some architectures. An architecture can override this value,
+ * perhaps setting it to a cacheline in size (since that will maintain
+ * cacheline alignment of the DMA). It must be a power of 2.
+ *
+ * Various parts of the networking layer expect at least 16 bytes of
+ * headroom, you should not reduce this.
+ */
+#ifndef NET_SKB_PAD
+#define NET_SKB_PAD	16
+#endif
+
+#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,23)
+static inline int __skb_cow(struct sk_buff *skb, unsigned int headroom,
+                            int cloned)
+{
+	int delta = 0;
+
+	if (headroom < NET_SKB_PAD)
+		headroom = NET_SKB_PAD;
+	if (headroom > skb_headroom(skb))
+		delta = headroom - skb_headroom(skb);
+
+	if (delta || cloned)
+		return pskb_expand_head(skb, ALIGN(delta, NET_SKB_PAD), 0,
+					GFP_ATOMIC);
+	return 0;
+}
+
+static inline int skb_cow_head(struct sk_buff *skb, unsigned int headroom)
+{
+	return __skb_cow(skb, headroom, skb_header_cloned(skb));
+}
+#endif  /* linux < 2.6.23 */
+
+
+#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,17)
+/* Emulate Linux 2.6.17 and later behavior, in which kfree_skb silently ignores 
+ * null pointer arguments. */
+#define kfree_skb(skb) kfree_skb_maybe_null(skb)
+static inline void kfree_skb_maybe_null(struct sk_buff *skb)
+{
+	if (likely(skb != NULL))
+		(kfree_skb)(skb);
+}
+#endif
+
+
+#ifndef CHECKSUM_PARTIAL
+/* Note that CHECKSUM_PARTIAL is not implemented, but this allows us to at
+ * least test against it: see update_csum() in forward.c. */
+#define CHECKSUM_PARTIAL 3
+#endif
+#ifndef CHECKSUM_COMPLETE
+#define CHECKSUM_COMPLETE CHECKSUM_HW
+#endif
+
+#ifdef HAVE_MAC_RAW
+#define mac_header mac.raw
+#define network_header nh.raw
+#endif
+
+#ifndef HAVE_SKBUFF_HEADER_HELPERS
+static inline unsigned char *skb_transport_header(const struct sk_buff *skb)
+{
+	return skb->h.raw;
+}
+
+static inline void skb_reset_transport_header(struct sk_buff *skb)
+{
+	skb->h.raw = skb->data;
+}
+
+static inline void skb_set_transport_header(struct sk_buff *skb,
+			const int offset)
+{
+	skb->h.raw = skb->data + offset;
+}
+
+static inline unsigned char *skb_network_header(const struct sk_buff *skb)
+{
+	return skb->nh.raw;
+}
+
+static inline void skb_set_network_header(struct sk_buff *skb, const int offset)
+{
+	skb->nh.raw = skb->data + offset;
+}
+
+static inline unsigned char *skb_mac_header(const struct sk_buff *skb)
+{
+	return skb->mac.raw;
+}
+
+static inline void skb_reset_mac_header(struct sk_buff *skb)
+{
+	skb->mac_header = skb->data;
+}
+
+static inline void skb_set_mac_header(struct sk_buff *skb, const int offset)
+{
+	skb->mac.raw = skb->data + offset;
+}
+
+static inline int skb_transport_offset(const struct sk_buff *skb)
+{
+    return skb_transport_header(skb) - skb->data;
+}
+
+static inline int skb_network_offset(const struct sk_buff *skb)
+{
+	return skb_network_header(skb) - skb->data;
+}
+
+static inline void skb_copy_to_linear_data(struct sk_buff *skb,
+					   const void *from,
+					   const unsigned int len)
+{
+	memcpy(skb->data, from, len);
+}
+#endif	/* !HAVE_SKBUFF_HEADER_HELPERS */
+
+#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,18)
+#warning "TSO/UFO not supported on kernels earlier than 2.6.18"
+
+static inline int skb_is_gso(const struct sk_buff *skb)
+{
+	return 0;
+}
+
+static inline struct sk_buff *skb_gso_segment(struct sk_buff *skb,
+					      int features)
+{
+	return NULL;
+}
+#endif	/* before 2.6.18 */
+
+#endif