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-rw-r--r--include/linux/skbuff.h57
1 files changed, 45 insertions, 12 deletions
diff --git a/include/linux/skbuff.h b/include/linux/skbuff.h
index 2e74055..e1c2392 100644
--- a/include/linux/skbuff.h
+++ b/include/linux/skbuff.h
@@ -246,9 +246,6 @@ struct sk_buff {
int iif;
/* 4 byte hole on 64 bit*/
- sk_buff_data_t transport_header;
- sk_buff_data_t network_header;
- sk_buff_data_t mac_header;
struct dst_entry *dst;
struct sec_path *sp;
@@ -303,13 +300,16 @@ struct sk_buff {
__u32 mark;
+ sk_buff_data_t transport_header;
+ sk_buff_data_t network_header;
+ sk_buff_data_t mac_header;
/* These elements must be at the end, see alloc_skb() for details. */
- unsigned int truesize;
- atomic_t users;
+ sk_buff_data_t tail;
unsigned char *head,
*data,
- *tail,
*end;
+ unsigned int truesize;
+ atomic_t users;
};
#ifdef __KERNEL__
@@ -812,12 +812,45 @@ static inline void skb_fill_page_desc(struct sk_buff *skb, int i,
#define SKB_FRAG_ASSERT(skb) BUG_ON(skb_shinfo(skb)->frag_list)
#define SKB_LINEAR_ASSERT(skb) BUG_ON(skb_is_nonlinear(skb))
+#ifdef NET_SKBUFF_DATA_USES_OFFSET
+static inline unsigned char *skb_tail_pointer(const struct sk_buff *skb)
+{
+ return skb->head + skb->tail;
+}
+
+static inline void skb_reset_tail_pointer(struct sk_buff *skb)
+{
+ skb->tail = skb->data - skb->head;
+}
+
+static inline void skb_set_tail_pointer(struct sk_buff *skb, const int offset)
+{
+ skb_reset_tail_pointer(skb);
+ skb->tail += offset;
+}
+#else /* NET_SKBUFF_DATA_USES_OFFSET */
+static inline unsigned char *skb_tail_pointer(const struct sk_buff *skb)
+{
+ return skb->tail;
+}
+
+static inline void skb_reset_tail_pointer(struct sk_buff *skb)
+{
+ skb->tail = skb->data;
+}
+
+static inline void skb_set_tail_pointer(struct sk_buff *skb, const int offset)
+{
+ skb->tail = skb->data + offset;
+}
+#endif /* NET_SKBUFF_DATA_USES_OFFSET */
+
/*
* Add data to an sk_buff
*/
static inline unsigned char *__skb_put(struct sk_buff *skb, unsigned int len)
{
- unsigned char *tmp = skb->tail;
+ unsigned char *tmp = skb_tail_pointer(skb);
SKB_LINEAR_ASSERT(skb);
skb->tail += len;
skb->len += len;
@@ -835,11 +868,11 @@ static inline unsigned char *__skb_put(struct sk_buff *skb, unsigned int len)
*/
static inline unsigned char *skb_put(struct sk_buff *skb, unsigned int len)
{
- unsigned char *tmp = skb->tail;
+ unsigned char *tmp = skb_tail_pointer(skb);
SKB_LINEAR_ASSERT(skb);
skb->tail += len;
skb->len += len;
- if (unlikely(skb->tail>skb->end))
+ if (unlikely(skb_tail_pointer(skb) > skb->end))
skb_over_panic(skb, len, current_text_addr());
return tmp;
}
@@ -935,7 +968,7 @@ static inline int skb_headroom(const struct sk_buff *skb)
*/
static inline int skb_tailroom(const struct sk_buff *skb)
{
- return skb_is_nonlinear(skb) ? 0 : skb->end - skb->tail;
+ return skb_is_nonlinear(skb) ? 0 : skb->end - skb_tail_pointer(skb);
}
/**
@@ -1127,8 +1160,8 @@ static inline void __skb_trim(struct sk_buff *skb, unsigned int len)
WARN_ON(1);
return;
}
- skb->len = len;
- skb->tail = skb->data + len;
+ skb->len = len;
+ skb_set_tail_pointer(skb, len);
}
/**
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