[DCCP]: New RX History Step 4 - Data Packet Utility Function (part 2 RX RTT sampling)
For a clean integration of receiver-based RTT sampling, the next patch needs
a test function which says whether a received packet is a data packet according
to [RFC 4340, 7.7].
Such a function is provided by this patch, and it is integrated into the main
DCCP code, since it is generic and usable by other parts of the DCCP/CCID code.
Signed-off-by: Gerrit Renker <gerrit@xxxxxxxxxxxxxx>
---
net/dccp/dccp.h | 12 ++++++++++++
1 file changed, 12 insertions(+)
--- a/net/dccp/dccp.h
+++ b/net/dccp/dccp.h
@@ -322,6 +322,7 @@ struct dccp_skb_cb {
#define DCCP_SKB_CB(__skb) ((struct dccp_skb_cb *)&((__skb)->cb[0]))
+/* RFC 4340, sec. 7.7 */
static inline int dccp_non_data_packet(const struct sk_buff *skb)
{
const __u8 type = DCCP_SKB_CB(skb)->dccpd_type;
@@ -334,6 +335,17 @@ static inline int dccp_non_data_packet(c
type == DCCP_PKT_SYNCACK;
}
+/* RFC 4340, sec. 7.7 */
+static inline int dccp_data_packet(const struct sk_buff *skb)
+{
+ const __u8 type = DCCP_SKB_CB(skb)->dccpd_type;
+
+ return type == DCCP_PKT_DATA ||
+ type == DCCP_PKT_DATAACK ||
+ type == DCCP_PKT_REQUEST ||
+ type == DCCP_PKT_RESPONSE;
+}
+
static inline int dccp_packet_without_ack(const struct sk_buff *skb)
{
const __u8 type = DCCP_SKB_CB(skb)->dccpd_type;
-
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