* published by the Free Software Foundation.
*/
-#include <linux/config.h>
+#include <linux/dccp.h>
#include <linux/compiler.h>
-#include <linux/time.h>
+#include <linux/ktime.h>
+#include <linux/list.h>
#include <linux/types.h>
-/* Read about the ECN nonce to see why it is 253 */
-#define DCCP_MAX_ACKVEC_LEN 253
+/* We can spread an ack vector across multiple options */
+#define DCCP_MAX_ACKVEC_LEN (DCCP_SINGLE_OPT_MAXLEN * 2)
+
+/* Estimated minimum average Ack Vector length - used for updating MPS */
+#define DCCPAV_MIN_OPTLEN 16
#define DCCP_ACKVEC_STATE_RECEIVED 0
#define DCCP_ACKVEC_STATE_ECN_MARKED (1 << 6)
/** struct dccp_ackvec - ack vector
*
- * This data structure is the one defined in the DCCP draft
- * Appendix A.
+ * This data structure is the one defined in RFC 4340, Appendix A.
*
- * @dccpav_buf_head - circular buffer head
- * @dccpav_buf_tail - circular buffer tail
- * @dccpav_buf_ackno - ack # of the most recent packet acknowledgeable in the
- * buffer (i.e. %dccpav_buf_head)
- * @dccpav_buf_nonce - the one-bit sum of the ECN Nonces on all packets acked
+ * @av_buf_head - circular buffer head
+ * @av_buf_tail - circular buffer tail
+ * @av_buf_ackno - ack # of the most recent packet acknowledgeable in the
+ * buffer (i.e. %av_buf_head)
+ * @av_buf_nonce - the one-bit sum of the ECN Nonces on all packets acked
* by the buffer with State 0
*
* Additionally, the HC-Receiver must keep some information about the
* Ack Vectors it has recently sent. For each packet sent carrying an
* Ack Vector, it remembers four variables:
*
- * @dccpav_ack_seqno - the Sequence Number used for the packet
- * (HC-Receiver seqno)
- * @dccpav_ack_ptr - the value of buf_head at the time of acknowledgement.
- * @dccpav_ack_ackno - the Acknowledgement Number used for the packet
- * (HC-Sender seqno)
- * @dccpav_ack_nonce - the one-bit sum of the ECN Nonces for all State 0.
+ * @av_records - list of dccp_ackvec_record
+ * @av_ack_nonce - the one-bit sum of the ECN Nonces for all State 0.
*
- * @dccpav_time - the time in usecs
- * @dccpav_buf - circular buffer of acknowledgeable packets
+ * @av_time - the time in usecs
+ * @av_buf - circular buffer of acknowledgeable packets
*/
struct dccp_ackvec {
- u64 dccpav_buf_ackno;
- u64 dccpav_ack_seqno;
- u64 dccpav_ack_ackno;
- struct timeval dccpav_time;
- u8 dccpav_buf_head;
- u8 dccpav_buf_tail;
- u8 dccpav_ack_ptr;
- u8 dccpav_sent_len;
- u8 dccpav_vec_len;
- u8 dccpav_buf_nonce;
- u8 dccpav_ack_nonce;
- u8 dccpav_buf[DCCP_MAX_ACKVEC_LEN];
+ u64 av_buf_ackno;
+ struct list_head av_records;
+ ktime_t av_time;
+ u16 av_buf_head;
+ u16 av_vec_len;
+ u8 av_buf_nonce;
+ u8 av_ack_nonce;
+ u8 av_buf[DCCP_MAX_ACKVEC_LEN];
+};
+
+/** struct dccp_ackvec_record - ack vector record
+ *
+ * ACK vector record as defined in Appendix A of spec.
+ *
+ * The list is sorted by avr_ack_seqno
+ *
+ * @avr_node - node in av_records
+ * @avr_ack_seqno - sequence number of the packet this record was sent on
+ * @avr_ack_ackno - sequence number being acknowledged
+ * @avr_ack_ptr - pointer into av_buf where this record starts
+ * @avr_ack_nonce - av_ack_nonce at the time this record was sent
+ * @avr_sent_len - lenght of the record in av_buf
+ */
+struct dccp_ackvec_record {
+ struct list_head avr_node;
+ u64 avr_ack_seqno;
+ u64 avr_ack_ackno;
+ u16 avr_ack_ptr;
+ u16 avr_sent_len;
+ u8 avr_ack_nonce;
};
struct sock;
struct sk_buff;
-#ifdef CONFIG_IP_DCCP_ACKVEC
+extern int dccp_ackvec_init(void);
+extern void dccp_ackvec_exit(void);
+
extern struct dccp_ackvec *dccp_ackvec_alloc(const gfp_t priority);
extern void dccp_ackvec_free(struct dccp_ackvec *av);
extern void dccp_ackvec_check_rcv_ackno(struct dccp_ackvec *av,
struct sock *sk, const u64 ackno);
extern int dccp_ackvec_parse(struct sock *sk, const struct sk_buff *skb,
- const u8 opt, const u8 *value, const u8 len);
+ u64 *ackno, const u8 opt,
+ const u8 *value, const u8 len);
extern int dccp_insert_option_ackvec(struct sock *sk, struct sk_buff *skb);
static inline int dccp_ackvec_pending(const struct dccp_ackvec *av)
{
- return av->dccpav_sent_len != av->dccpav_vec_len;
-}
-#else /* CONFIG_IP_DCCP_ACKVEC */
-static inline struct dccp_ackvec *dccp_ackvec_alloc(const gfp_t priority)
-{
- return NULL;
-}
-
-static inline void dccp_ackvec_free(struct dccp_ackvec *av)
-{
-}
-
-static inline int dccp_ackvec_add(struct dccp_ackvec *av, const struct sock *sk,
- const u64 ackno, const u8 state)
-{
- return -1;
-}
-
-static inline void dccp_ackvec_check_rcv_ackno(struct dccp_ackvec *av,
- struct sock *sk, const u64 ackno)
-{
-}
-
-static inline int dccp_ackvec_parse(struct sock *sk, const struct sk_buff *skb,
- const u8 opt, const u8 *value, const u8 len)
-{
- return -1;
-}
-
-static inline int dccp_insert_option_ackvec(const struct sock *sk,
- const struct sk_buff *skb)
-{
- return -1;
-}
-
-static inline int dccp_ackvec_pending(const struct dccp_ackvec *av)
-{
- return 0;
+ return av->av_vec_len;
}
-#endif /* CONFIG_IP_DCCP_ACKVEC */
#endif /* _ACKVEC_H */