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#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/compiler.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_OPT_LEN 253

/* We can spread an ack vector across multiple options */

#define DCCP_MAX_ACKVEC_LEN (DCCP_MAX_ACKVEC_OPT_LEN * 2)

#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 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

 *                     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_records - list of dccp_ackvec_record

 * @dccpav_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

 */

struct dccp_ackvec {

        u64             dccpav_buf_ackno;

        struct list_head dccpav_records;

        ktime_t         dccpav_time;

        u16             dccpav_buf_head;

        u16             dccpav_vec_len;

        u8              dccpav_buf_nonce;

        u8              dccpav_ack_nonce;

        u8              dccpav_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 dccpavr_ack_seqno

 *

 * @dccpavr_node - node in dccpav_records

 * @dccpavr_ack_seqno - sequence number of the packet this record was sent on

 * @dccpavr_ack_ackno - sequence number being acknowledged

 * @dccpavr_ack_ptr - pointer into dccpav_buf where this record starts

 * @dccpavr_ack_nonce - dccpav_ack_nonce at the time this record was sent

 * @dccpavr_sent_len - length of the record in dccpav_buf

 */

struct dccp_ackvec_record {

        struct list_head dccpavr_node;

        u64              dccpavr_ack_seqno;

        u64              dccpavr_ack_ackno;

        u16              dccpavr_ack_ptr;

        u16              dccpavr_sent_len;

        u8               dccpavr_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 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,

                             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_vec_len;

}

#else /* CONFIG_IP_DCCP_ACKVEC */

static inline int dccp_ackvec_init(void)

{

        return 0;

}

static inline void dccp_ackvec_exit(void)

{

}

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 u64 *ackno, 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 */