1 files changed, 55 insertions, 10 deletions

diff --git a/include/linux/skbuff.h b/include/linux/skbuff.h
index 6f0b2f7d0010..9391e4a4c344 100644
--- a/include/linux/skbuff.h
+++ b/include/linux/skbuff.h
@@ -65,13 +65,20 @@
  *          is able to produce some skb->csum, it MUST use COMPLETE,
  *          not UNNECESSARY.
  *
+ *      PARTIAL: identical to the case for output below.  This may occur
+ *          on a packet received directly from another Linux OS, e.g.,
+ *          a virtualised Linux kernel on the same host.  The packet can
+ *          be treated in the same way as UNNECESSARY except that on
+ *          output (i.e., forwarding) the checksum must be filled in
+ *          by the OS or the hardware.
+ *
  * B. Checksumming on output.
  *
  *      NONE: skb is checksummed by protocol or csum is not required.
  *
  *      PARTIAL: device is required to csum packet as seen by hard_start_xmit
- *      from skb->transport_header to the end and to record the checksum
- *      at skb->transport_header + skb->csum.
+ *      from skb->csum_start to the end and to record the checksum
+ *      at skb->csum_start + skb->csum_offset.
  *
  *      Device must show its capabilities in dev->features, set
  *      at device setup time.
@@ -82,6 +89,7 @@
  *                        TCP/UDP over IPv4. Sigh. Vendors like this
  *                        way by an unknown reason. Though, see comment above
  *                        about CHECKSUM_UNNECESSARY. 8)
+ *      NETIF_F_IPV6_CSUM about as dumb as the last one but does IPv6 instead.
  *
  *      Any questions? No questions, good.              --ANK
  */
@@ -147,8 +155,8 @@ struct skb_shared_info {
 
 /* We divide dataref into two halves.  The higher 16 bits hold references
  * to the payload part of skb->data.  The lower 16 bits hold references to
- * the entire skb->data.  It is up to the users of the skb to agree on
- * where the payload starts.
+ * the entire skb->data.  A clone of a headerless skb holds the length of
+ * the header in skb->hdr_len.
  *
  * All users must obey the rule that the skb->data reference count must be
  * greater than or equal to the payload reference count.
@@ -196,7 +204,6 @@ typedef unsigned char *sk_buff_data_t;
  *      @sk: Socket we are owned by
  *      @tstamp: Time we arrived
  *      @dev: Device we arrived on/are leaving by
- *      @iif: ifindex of device we arrived on
  *      @transport_header: Transport layer header
  *      @network_header: Network layer header
  *      @mac_header: Link layer header
@@ -206,6 +213,7 @@ typedef unsigned char *sk_buff_data_t;
  *      @len: Length of actual data
  *      @data_len: Data length
  *      @mac_len: Length of link layer header
+ *      @hdr_len: writable header length of cloned skb
  *      @csum: Checksum (must include start/offset pair)
  *      @csum_start: Offset from skb->head where checksumming should start
  *      @csum_offset: Offset from csum_start where checksum should be stored
@@ -227,9 +235,12 @@ typedef unsigned char *sk_buff_data_t;
  *      @mark: Generic packet mark
  *      @nfct: Associated connection, if any
  *      @ipvs_property: skbuff is owned by ipvs
+ *      @nf_trace: netfilter packet trace flag
  *      @nfctinfo: Relationship of this skb to the connection
  *      @nfct_reasm: netfilter conntrack re-assembly pointer
  *      @nf_bridge: Saved data about a bridged frame - see br_netfilter.c
+ *      @iif: ifindex of device we arrived on
+ *      @queue_mapping: Queue mapping for multiqueue devices
  *      @tc_index: Traffic control index
  *      @tc_verd: traffic control verdict
  *      @dma_cookie: a cookie to one of several possible DMA operations
@@ -245,8 +256,6 @@ struct sk_buff {
         struct sock             *sk;
         ktime_t                 tstamp;
         struct net_device       *dev;
-        int                     iif;
-        /* 4 byte hole on 64 bit*/
 
         struct  dst_entry       *dst;
         struct  sec_path        *sp;
@@ -260,8 +269,9 @@ struct sk_buff {
         char                    cb[48];
 
         unsigned int            len,
-                                data_len,
-                                mac_len;
+                                data_len;
+        __u16                   mac_len,
+                                hdr_len;
         union {
                 __wsum          csum;
                 struct {
@@ -277,7 +287,8 @@ struct sk_buff {
                                 nfctinfo:3;
         __u8                    pkt_type:3,
                                 fclone:2,
-                                ipvs_property:1;
+                                ipvs_property:1,
+                                nf_trace:1;
         __be16                  protocol;
 
         void                    (*destructor)(struct sk_buff *skb);
@@ -288,12 +299,18 @@ struct sk_buff {
 #ifdef CONFIG_BRIDGE_NETFILTER
         struct nf_bridge_info   *nf_bridge;
 #endif
+
+        int                     iif;
+        __u16                   queue_mapping;
+
 #ifdef CONFIG_NET_SCHED
         __u16                   tc_index;       /* traffic control index */
 #ifdef CONFIG_NET_CLS_ACT
         __u16                   tc_verd;        /* traffic control verdict */
 #endif
 #endif
+        /* 2 byte hole */
+
 #ifdef CONFIG_NET_DMA
         dma_cookie_t            dma_cookie;
 #endif
@@ -1322,6 +1339,20 @@ static inline struct sk_buff *netdev_alloc_skb(struct net_device *dev,
 }
 
 /**
+ *      skb_clone_writable - is the header of a clone writable
+ *      @skb: buffer to check
+ *      @len: length up to which to write
+ *
+ *      Returns true if modifying the header part of the cloned buffer
+ *      does not requires the data to be copied.
+ */
+static inline int skb_clone_writable(struct sk_buff *skb, int len)
+{
+        return !skb_header_cloned(skb) &&
+               skb_headroom(skb) + len <= skb->hdr_len;
+}
+
+/**
  *      skb_cow - copy header of skb when it is required
  *      @skb: buffer to cow
  *      @headroom: needed headroom
@@ -1709,6 +1740,20 @@ static inline void skb_init_secmark(struct sk_buff *skb)
 { }
 #endif
 
+static inline void skb_set_queue_mapping(struct sk_buff *skb, u16 queue_mapping)
+{
+#ifdef CONFIG_NETDEVICES_MULTIQUEUE
+        skb->queue_mapping = queue_mapping;
+#endif
+}
+
+static inline void skb_copy_queue_mapping(struct sk_buff *to, const struct sk_buff *from)
+{
+#ifdef CONFIG_NETDEVICES_MULTIQUEUE
+        to->queue_mapping = from->queue_mapping;
+#endif
+}
+
 static inline int skb_is_gso(const struct sk_buff *skb)
 {
         return skb_shinfo(skb)->gso_size;