1 files changed, 61 insertions, 0 deletions

diff --git a/include/linux/skbuff.h b/include/linux/skbuff.h
index 320e976d5ab8..821c7f45d2a7 100644
--- a/include/linux/skbuff.h
+++ b/include/linux/skbuff.h
@@ -230,6 +230,13 @@ enum {
 
         /* generate wifi status information (where possible) */
         SKBTX_WIFI_STATUS = 1 << 4,
+
+        /* This indicates at least one fragment might be overwritten
+         * (as in vmsplice(), sendfile() ...)
+         * If we need to compute a TX checksum, we'll need to copy
+         * all frags to avoid possible bad checksum
+         */
+        SKBTX_SHARED_FRAG = 1 << 5,
 };
 
 /*
@@ -307,6 +314,8 @@ enum {
         SKB_GSO_TCPV6 = 1 << 4,
 
         SKB_GSO_FCOE = 1 << 5,
+
+        SKB_GSO_GRE = 1 << 6,
 };
 
 #if BITS_PER_LONG > 32
@@ -797,6 +806,16 @@ static inline int skb_cloned(const struct sk_buff *skb)
                (atomic_read(&skb_shinfo(skb)->dataref) & SKB_DATAREF_MASK) != 1;
 }
 
+static inline int skb_unclone(struct sk_buff *skb, gfp_t pri)
+{
+        might_sleep_if(pri & __GFP_WAIT);
+
+        if (skb_cloned(skb))
+                return pskb_expand_head(skb, 0, 0, pri);
+
+        return 0;
+}
+
 /**
  *      skb_header_cloned - is the header a clone
  *      @skb: buffer to check
@@ -1492,6 +1511,11 @@ static inline void skb_set_inner_network_header(struct sk_buff *skb,
         skb->inner_network_header += offset;
 }
 
+static inline bool skb_transport_header_was_set(const struct sk_buff *skb)
+{
+        return skb->transport_header != ~0U;
+}
+
 static inline unsigned char *skb_transport_header(const struct sk_buff *skb)
 {
         return skb->head + skb->transport_header;
@@ -1580,6 +1604,11 @@ static inline void skb_set_inner_network_header(struct sk_buff *skb,
         skb->inner_network_header = skb->data + offset;
 }
 
+static inline bool skb_transport_header_was_set(const struct sk_buff *skb)
+{
+        return skb->transport_header != NULL;
+}
+
 static inline unsigned char *skb_transport_header(const struct sk_buff *skb)
 {
         return skb->transport_header;
@@ -1815,6 +1844,10 @@ static inline void __skb_queue_purge(struct sk_buff_head *list)
                 kfree_skb(skb);
 }
 
+#define NETDEV_FRAG_PAGE_MAX_ORDER get_order(32768)
+#define NETDEV_FRAG_PAGE_MAX_SIZE  (PAGE_SIZE << NETDEV_FRAG_PAGE_MAX_ORDER)
+#define NETDEV_PAGECNT_MAX_BIAS    NETDEV_FRAG_PAGE_MAX_SIZE
+
 extern void *netdev_alloc_frag(unsigned int fragsz);
 
 extern struct sk_buff *__netdev_alloc_skb(struct net_device *dev,
@@ -2191,6 +2224,19 @@ static inline int skb_linearize(struct sk_buff *skb)
 }
 
 /**
+ * skb_has_shared_frag - can any frag be overwritten
+ * @skb: buffer to test
+ *
+ * Return true if the skb has at least one frag that might be modified
+ * by an external entity (as in vmsplice()/sendfile())
+ */
+static inline bool skb_has_shared_frag(const struct sk_buff *skb)
+{
+        return skb_is_nonlinear(skb) &&
+               skb_shinfo(skb)->tx_flags & SKBTX_SHARED_FRAG;
+}
+
+/**
  *      skb_linearize_cow - make sure skb is linear and writable
  *      @skb: buffer to process
  *
@@ -2688,6 +2734,21 @@ static inline struct sec_path *skb_sec_path(struct sk_buff *skb)
 }
 #endif
 
+/* Keeps track of mac header offset relative to skb->head.
+ * It is useful for TSO of Tunneling protocol. e.g. GRE.
+ * For non-tunnel skb it points to skb_mac_header() and for
+ * tunnel skb it points to outer mac header. */
+struct skb_gso_cb {
+        int mac_offset;
+};
+#define SKB_GSO_CB(skb) ((struct skb_gso_cb *)(skb)->cb)
+
+static inline int skb_tnl_header_len(const struct sk_buff *inner_skb)
+{
+        return (skb_mac_header(inner_skb) - inner_skb->head) -
+                SKB_GSO_CB(inner_skb)->mac_offset;
+}
+
 static inline bool skb_is_gso(const struct sk_buff *skb)
 {
         return skb_shinfo(skb)->gso_size;