ae31c3399d
Isolating it, that will be used when we introduce a CCID2 (TCP-Like) implementation. Signed-off-by: Arnaldo Carvalho de Melo <acme@mandriva.com> Signed-off-by: David S. Miller <davem@davemloft.net>
134 lines
3.9 KiB
C
134 lines
3.9 KiB
C
#ifndef _ACKVEC_H
|
|
#define _ACKVEC_H
|
|
/*
|
|
* net/dccp/ackvec.h
|
|
*
|
|
* An implementation of the DCCP protocol
|
|
* Copyright (c) 2005 Arnaldo Carvalho de Melo <acme@mandriva.com>
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify it
|
|
* under the terms of the GNU General Public License version 2 as
|
|
* published by the Free Software Foundation.
|
|
*/
|
|
|
|
#include <linux/config.h>
|
|
#include <linux/compiler.h>
|
|
#include <linux/time.h>
|
|
#include <linux/types.h>
|
|
|
|
/* Read about the ECN nonce to see why it is 253 */
|
|
#define DCCP_MAX_ACKVEC_LEN 253
|
|
|
|
#define DCCP_ACKVEC_STATE_RECEIVED 0
|
|
#define DCCP_ACKVEC_STATE_ECN_MARKED (1 << 6)
|
|
#define DCCP_ACKVEC_STATE_NOT_RECEIVED (3 << 6)
|
|
|
|
#define DCCP_ACKVEC_STATE_MASK 0xC0 /* 11000000 */
|
|
#define DCCP_ACKVEC_LEN_MASK 0x3F /* 00111111 */
|
|
|
|
/** struct dccp_ackvec - ack vector
|
|
*
|
|
* This data structure is the one defined in the DCCP draft
|
|
* 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
|
|
* 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.
|
|
*
|
|
* @dccpav_buf_len - circular buffer length
|
|
* @dccpav_time - the time in usecs
|
|
* @dccpav_buf - circular buffer of acknowledgeable packets
|
|
*/
|
|
struct dccp_ackvec {
|
|
unsigned int dccpav_buf_head;
|
|
unsigned int dccpav_buf_tail;
|
|
u64 dccpav_buf_ackno;
|
|
u64 dccpav_ack_seqno;
|
|
u64 dccpav_ack_ackno;
|
|
unsigned int dccpav_ack_ptr;
|
|
unsigned int dccpav_sent_len;
|
|
unsigned int dccpav_vec_len;
|
|
unsigned int dccpav_buf_len;
|
|
struct timeval dccpav_time;
|
|
u8 dccpav_buf_nonce;
|
|
u8 dccpav_ack_nonce;
|
|
u8 dccpav_buf[0];
|
|
};
|
|
|
|
struct sock;
|
|
struct sk_buff;
|
|
|
|
#ifdef CONFIG_IP_DCCP_ACKVEC
|
|
extern struct dccp_ackvec *dccp_ackvec_alloc(unsigned int len,
|
|
const unsigned int __nocast priority);
|
|
extern void dccp_ackvec_free(struct dccp_ackvec *av);
|
|
|
|
extern int dccp_ackvec_add(struct dccp_ackvec *av, const struct sock *sk,
|
|
const u64 ackno, const u8 state);
|
|
|
|
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);
|
|
|
|
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(unsigned int len,
|
|
const unsigned int __nocast 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;
|
|
}
|
|
#endif /* CONFIG_IP_DCCP_ACKVEC */
|
|
#endif /* _ACKVEC_H */
|