1 files changed, 58 insertions, 16 deletions

diff --git a/include/linux/skbuff.h b/include/linux/skbuff.h
index 4dc65b55812e..66f8819f9568 100644
--- a/include/linux/skbuff.h
+++ b/include/linux/skbuff.h
@@ -28,6 +28,7 @@
 #include <linux/net.h>
 #include <linux/textsearch.h>
 #include <net/checksum.h>
+#include <linux/dmaengine.h>
 
 #define HAVE_ALLOC_SKB          /* For the drivers to know */
 #define HAVE_ALIGNABLE_SKB      /* Ditto 8)                */
@@ -208,6 +209,7 @@ enum {
  *      @nf_bridge: Saved data about a bridged frame - see br_netfilter.c
  *      @tc_index: Traffic control index
  *      @tc_verd: traffic control verdict
+ *      @secmark: security marking
  */
 
 struct sk_buff {
@@ -284,6 +286,12 @@ struct sk_buff {
         __u16                   tc_verd;        /* traffic control verdict */
 #endif
 #endif
+#ifdef CONFIG_NET_DMA
+        dma_cookie_t            dma_cookie;
+#endif
+#ifdef CONFIG_NETWORK_SECMARK
+        __u32                   secmark;
+#endif
 
 
         /* These elements must be at the end, see alloc_skb() for details.  */
@@ -966,15 +974,16 @@ static inline void skb_reserve(struct sk_buff *skb, int len)
 #define NET_SKB_PAD     16
 #endif
 
-extern int ___pskb_trim(struct sk_buff *skb, unsigned int len, int realloc);
+extern int ___pskb_trim(struct sk_buff *skb, unsigned int len);
 
 static inline void __skb_trim(struct sk_buff *skb, unsigned int len)
 {
-        if (!skb->data_len) {
-                skb->len  = len;
-                skb->tail = skb->data + len;
-        } else
-                ___pskb_trim(skb, len, 0);
+        if (unlikely(skb->data_len)) {
+                WARN_ON(1);
+                return;
+        }
+        skb->len  = len;
+        skb->tail = skb->data + len;
 }
 
 /**
@@ -984,6 +993,7 @@ static inline void __skb_trim(struct sk_buff *skb, unsigned int len)
  *
  *      Cut the length of a buffer down by removing data from the tail. If
  *      the buffer is already under the length specified it is not modified.
+ *      The skb must be linear.
  */
 static inline void skb_trim(struct sk_buff *skb, unsigned int len)
 {
@@ -994,12 +1004,10 @@ static inline void skb_trim(struct sk_buff *skb, unsigned int len)
 
 static inline int __pskb_trim(struct sk_buff *skb, unsigned int len)
 {
-        if (!skb->data_len) {
-                skb->len  = len;
-                skb->tail = skb->data+len;
-                return 0;
-        }
-        return ___pskb_trim(skb, len, 1);
+        if (skb->data_len)
+                return ___pskb_trim(skb, len);
+        __skb_trim(skb, len);
+        return 0;
 }
 
 static inline int pskb_trim(struct sk_buff *skb, unsigned int len)
@@ -1160,18 +1168,34 @@ static inline int skb_can_coalesce(struct sk_buff *skb, int i,
         return 0;
 }
 
+static inline int __skb_linearize(struct sk_buff *skb)
+{
+        return __pskb_pull_tail(skb, skb->data_len) ? 0 : -ENOMEM;
+}
+
 /**
  *      skb_linearize - convert paged skb to linear one
  *      @skb: buffer to linarize
- *      @gfp: allocation mode
  *
  *      If there is no free memory -ENOMEM is returned, otherwise zero
  *      is returned and the old skb data released.
  */
-extern int __skb_linearize(struct sk_buff *skb, gfp_t gfp);
-static inline int skb_linearize(struct sk_buff *skb, gfp_t gfp)
+static inline int skb_linearize(struct sk_buff *skb)
+{
+        return skb_is_nonlinear(skb) ? __skb_linearize(skb) : 0;
+}
+
+/**
+ *      skb_linearize_cow - make sure skb is linear and writable
+ *      @skb: buffer to process
+ *
+ *      If there is no free memory -ENOMEM is returned, otherwise zero
+ *      is returned and the old skb data released.
+ */
+static inline int skb_linearize_cow(struct sk_buff *skb)
 {
-        return __skb_linearize(skb, gfp);
+        return skb_is_nonlinear(skb) || skb_cloned(skb) ?
+               __skb_linearize(skb) : 0;
 }
 
 /**
@@ -1395,5 +1419,23 @@ static inline void nf_reset(struct sk_buff *skb)
 static inline void nf_reset(struct sk_buff *skb) {}
 #endif /* CONFIG_NETFILTER */
 
+#ifdef CONFIG_NETWORK_SECMARK
+static inline void skb_copy_secmark(struct sk_buff *to, const struct sk_buff *from)
+{
+        to->secmark = from->secmark;
+}
+
+static inline void skb_init_secmark(struct sk_buff *skb)
+{
+        skb->secmark = 0;
+}
+#else
+static inline void skb_copy_secmark(struct sk_buff *to, const struct sk_buff *from)
+{ }
+
+static inline void skb_init_secmark(struct sk_buff *skb)
+{ }
+#endif
+
 #endif  /* __KERNEL__ */
 #endif  /* _LINUX_SKBUFF_H */