net: add skb_set_end_offset() helper

commit 763087dab97547230a6807c865a6a5ae53a59247 upstream.

We have multiple places where this helper is convenient,
and plan using it in the following patch.

Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/include/linux/skbuff.h b/include/linux/skbuff.h
index 532f5d4..6155889 100644 (file)
--- a/include/linux/skbuff.h
+++ b/include/linux/skbuff.h
@@ -1436,6 +1436,11 @@ static inline unsigned int skb_end_offset(const struct sk_buff *skb)
 {
        return skb->end;
 }
+
+static inline void skb_set_end_offset(struct sk_buff *skb, unsigned int offset)
+{
+       skb->end = offset;
+}
 #else
 static inline unsigned char *skb_end_pointer(const struct sk_buff *skb)
 {
@@ -1446,6 +1451,11 @@ static inline unsigned int skb_end_offset(const struct sk_buff *skb)
 {
        return skb->end - skb->head;
 }
+
+static inline void skb_set_end_offset(struct sk_buff *skb, unsigned int offset)
+{
+       skb->end = skb->head + offset;
+}
 #endif
 
 /* Internal */

diff --git a/net/core/skbuff.c b/net/core/skbuff.c
index 6cb7ec8..105530f 100644 (file)
--- a/net/core/skbuff.c
+++ b/net/core/skbuff.c
@@ -203,7 +203,7 @@ static void __build_skb_around(struct sk_buff *skb, void *data,
        skb->head = data;
        skb->data = data;
        skb_reset_tail_pointer(skb);
-       skb->end = skb->tail + size;
+       skb_set_end_offset(skb, size);
        skb->mac_header = (typeof(skb->mac_header))~0U;
        skb->transport_header = (typeof(skb->transport_header))~0U;
 
@@ -1738,11 +1738,10 @@ int pskb_expand_head(struct sk_buff *skb, int nhead, int ntail,
        skb->head     = data;
        skb->head_frag = 0;
        skb->data    += off;
+
+       skb_set_end_offset(skb, size);
 #ifdef NET_SKBUFF_DATA_USES_OFFSET
-       skb->end      = size;
        off           = nhead;
-#else
-       skb->end      = skb->head + size;
 #endif
        skb->tail             += off;
        skb_headers_offset_update(skb, nhead);
@@ -6159,11 +6158,7 @@ static int pskb_carve_inside_header(struct sk_buff *skb, const u32 off,
        skb->head = data;
        skb->data = data;
        skb->head_frag = 0;
-#ifdef NET_SKBUFF_DATA_USES_OFFSET
-       skb->end = size;
-#else
-       skb->end = skb->head + size;
-#endif
+       skb_set_end_offset(skb, size);
        skb_set_tail_pointer(skb, skb_headlen(skb));
        skb_headers_offset_update(skb, 0);
        skb->cloned = 0;
@@ -6301,11 +6296,7 @@ static int pskb_carve_inside_nonlinear(struct sk_buff *skb, const u32 off,
        skb->head = data;
        skb->head_frag = 0;
        skb->data = data;
-#ifdef NET_SKBUFF_DATA_USES_OFFSET
-       skb->end = size;
-#else
-       skb->end = skb->head + size;
-#endif
+       skb_set_end_offset(skb, size);
        skb_reset_tail_pointer(skb);
        skb_headers_offset_update(skb, 0);
        skb->cloned   = 0;