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authorPavel Emelyanov <xemul@parallels.com>2012-02-21 07:30:58 +0000
committerDavid S. Miller <davem@davemloft.net>2012-02-21 14:58:57 -0500
commit3f518bf745cbd6007d8069100fb9cb09e960c872 (patch)
treedebbe9e9340d46080f1b82e4149a2427545c4aef /net/core
parent4934b0329f7150dcb5f90506860e2db32274c755 (diff)
downloadop-kernel-dev-3f518bf745cbd6007d8069100fb9cb09e960c872.zip
op-kernel-dev-3f518bf745cbd6007d8069100fb9cb09e960c872.tar.gz
datagram: Add offset argument to __skb_recv_datagram
This one is only considered for MSG_PEEK flag and the value pointed by it specifies where to start peeking bytes from. If the offset happens to point into the middle of the returned skb, the offset within this skb is put back to this very argument. Signed-off-by: Pavel Emelyanov <xemul@parallels.com> Acked-by: Eric Dumazet <eric.dumazet@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/core')
-rw-r--r--net/core/datagram.c21
1 files changed, 13 insertions, 8 deletions
diff --git a/net/core/datagram.c b/net/core/datagram.c
index 6f54d0a..d3cf12f 100644
--- a/net/core/datagram.c
+++ b/net/core/datagram.c
@@ -132,6 +132,8 @@ out_noerr:
* __skb_recv_datagram - Receive a datagram skbuff
* @sk: socket
* @flags: MSG_ flags
+ * @off: an offset in bytes to peek skb from. Returns an offset
+ * within an skb where data actually starts
* @peeked: returns non-zero if this packet has been seen before
* @err: error code returned
*
@@ -158,7 +160,7 @@ out_noerr:
* the standard around please.
*/
struct sk_buff *__skb_recv_datagram(struct sock *sk, unsigned flags,
- int *peeked, int *err)
+ int *peeked, int *off, int *err)
{
struct sk_buff *skb;
long timeo;
@@ -183,19 +185,22 @@ struct sk_buff *__skb_recv_datagram(struct sock *sk, unsigned flags,
struct sk_buff_head *queue = &sk->sk_receive_queue;
spin_lock_irqsave(&queue->lock, cpu_flags);
- skb = skb_peek(queue);
- if (skb) {
+ skb_queue_walk(queue, skb) {
*peeked = skb->peeked;
if (flags & MSG_PEEK) {
+ if (*off >= skb->len) {
+ *off -= skb->len;
+ continue;
+ }
skb->peeked = 1;
atomic_inc(&skb->users);
} else
__skb_unlink(skb, queue);
- }
- spin_unlock_irqrestore(&queue->lock, cpu_flags);
- if (skb)
+ spin_unlock_irqrestore(&queue->lock, cpu_flags);
return skb;
+ }
+ spin_unlock_irqrestore(&queue->lock, cpu_flags);
/* User doesn't want to wait */
error = -EAGAIN;
@@ -215,10 +220,10 @@ EXPORT_SYMBOL(__skb_recv_datagram);
struct sk_buff *skb_recv_datagram(struct sock *sk, unsigned flags,
int noblock, int *err)
{
- int peeked;
+ int peeked, off = 0;
return __skb_recv_datagram(sk, flags | (noblock ? MSG_DONTWAIT : 0),
- &peeked, err);
+ &peeked, &off, err);
}
EXPORT_SYMBOL(skb_recv_datagram);
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