int skb_copy_datagram_iovec(const struct sk_buff *skb, int offset,
struct iovec *to, int len)
{
- int start = skb_headlen(skb);
- int i, copy = start - offset;
+ int end = skb_headlen(skb);
+ int i, copy = end - offset;
/* Copy header. */
if (copy > 0) {
/* Copy paged appendix. Hmm... why does this look so complicated? */
for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) {
- int end;
+ BUG_TRAP(len >= 0);
- BUG_TRAP(start <= offset + len);
-
- end = start + skb_shinfo(skb)->frags[i].size;
+ end = offset + skb_shinfo(skb)->frags[i].size;
if ((copy = end - offset) > 0) {
int err;
u8 *vaddr;
if (copy > len)
copy = len;
vaddr = kmap(page);
- err = memcpy_toiovec(to, vaddr + frag->page_offset +
- offset - start, copy);
+ err = memcpy_toiovec(to, vaddr + frag->page_offset,
+ copy);
kunmap(page);
if (err)
goto fault;
return 0;
offset += copy;
}
- start = end;
}
if (skb_shinfo(skb)->frag_list) {
struct sk_buff *list = skb_shinfo(skb)->frag_list;
for (; list; list = list->next) {
- int end;
-
- BUG_TRAP(start <= offset + len);
+ BUG_TRAP(len >= 0);
- end = start + list->len;
+ end = offset + list->len;
if ((copy = end - offset) > 0) {
if (copy > len)
copy = len;
- if (skb_copy_datagram_iovec(list,
- offset - start,
- to, copy))
+ if (skb_copy_datagram_iovec(list, 0, to, copy))
goto fault;
if ((len -= copy) == 0)
return 0;
offset += copy;
}
- start = end;
}
}
if (!len)
static int skb_copy_and_csum_datagram(const struct sk_buff *skb, int offset,
u8 __user *to, int len,
- unsigned int *csump)
+ __wsum *csump)
{
- int start = skb_headlen(skb);
+ int end = skb_headlen(skb);
int pos = 0;
- int i, copy = start - offset;
+ int i, copy = end - offset;
/* Copy header. */
if (copy > 0) {
}
for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) {
- int end;
+ BUG_TRAP(len >= 0);
- BUG_TRAP(start <= offset + len);
-
- end = start + skb_shinfo(skb)->frags[i].size;
+ end = offset + skb_shinfo(skb)->frags[i].size;
if ((copy = end - offset) > 0) {
- unsigned int csum2;
+ __wsum csum2;
int err = 0;
u8 *vaddr;
skb_frag_t *frag = &skb_shinfo(skb)->frags[i];
copy = len;
vaddr = kmap(page);
csum2 = csum_and_copy_to_user(vaddr +
- frag->page_offset +
- offset - start,
+ frag->page_offset,
to, copy, 0, &err);
kunmap(page);
if (err)
to += copy;
pos += copy;
}
- start = end;
}
if (skb_shinfo(skb)->frag_list) {
struct sk_buff *list = skb_shinfo(skb)->frag_list;
for (; list; list=list->next) {
- int end;
-
- BUG_TRAP(start <= offset + len);
+ BUG_TRAP(len >= 0);
- end = start + list->len;
+ end = offset + list->len;
if ((copy = end - offset) > 0) {
- unsigned int csum2 = 0;
+ __wsum csum2 = 0;
if (copy > len)
copy = len;
- if (skb_copy_and_csum_datagram(list,
- offset - start,
+ if (skb_copy_and_csum_datagram(list, 0,
to, copy,
&csum2))
goto fault;
to += copy;
pos += copy;
}
- start = end;
}
}
if (!len)
return -EFAULT;
}
-unsigned int __skb_checksum_complete(struct sk_buff *skb)
+__sum16 __skb_checksum_complete_head(struct sk_buff *skb, int len)
{
- unsigned int sum;
+ __sum16 sum;
- sum = (u16)csum_fold(skb_checksum(skb, 0, skb->len, skb->csum));
+ sum = csum_fold(skb_checksum(skb, 0, len, skb->csum));
if (likely(!sum)) {
if (unlikely(skb->ip_summed == CHECKSUM_COMPLETE))
netdev_rx_csum_fault(skb->dev);
}
return sum;
}
+EXPORT_SYMBOL(__skb_checksum_complete_head);
+
+__sum16 __skb_checksum_complete(struct sk_buff *skb)
+{
+ return __skb_checksum_complete_head(skb, skb->len);
+}
EXPORT_SYMBOL(__skb_checksum_complete);
/**
* @skb: skbuff
* @hlen: hardware length
* @iov: io vector
- *
+ *
* Caller _must_ check that skb will fit to this iovec.
*
* Returns: 0 - success.
int skb_copy_and_csum_datagram_iovec(struct sk_buff *skb,
int hlen, struct iovec *iov)
{
- unsigned int csum;
+ __wsum csum;
int chunk = skb->len - hlen;
/* Skip filled elements.
if (skb_copy_and_csum_datagram(skb, hlen, iov->iov_base,
chunk, &csum))
goto fault;
- if ((unsigned short)csum_fold(csum))
+ if (csum_fold(csum))
goto csum_error;
if (unlikely(skb->ip_summed == CHECKSUM_COMPLETE))
netdev_rx_csum_fault(skb->dev);