[linux-block.git] / net / dccp / dccp.h

#ifndef _DCCP_H
#define _DCCP_H
/*
 *  net/dccp/dccp.h
 *
 *  An implementation of the DCCP protocol
 *  Copyright (c) 2005 Arnaldo Carvalho de Melo <acme@conectiva.com.br>
 *  Copyright (c) 2005-6 Ian McDonald <ian.mcdonald@jandi.co.nz>
 *
 *	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/dccp.h>
#include <net/snmp.h>
#include <net/sock.h>
#include <net/tcp.h>
#include "ackvec.h"

#ifdef CONFIG_IP_DCCP_DEBUG
extern int dccp_debug;

#define dccp_pr_debug(format, a...) \
	do { if (dccp_debug) \
		printk(KERN_DEBUG "%s: " format, __FUNCTION__ , ##a); \
	} while (0)
#define dccp_pr_debug_cat(format, a...) do { if (dccp_debug) \
					     printk(format, ##a); } while (0)
#else
#define dccp_pr_debug(format, a...)
#define dccp_pr_debug_cat(format, a...)
#endif

extern struct inet_hashinfo dccp_hashinfo;

extern atomic_t dccp_orphan_count;
extern int dccp_tw_count;
extern void dccp_tw_deschedule(struct inet_timewait_sock *tw);

extern void dccp_time_wait(struct sock *sk, int state, int timeo);

/* FIXME: Right size this */
#define DCCP_MAX_OPT_LEN 128

#define DCCP_MAX_PACKET_HDR 32

#define MAX_DCCP_HEADER  (DCCP_MAX_PACKET_HDR + DCCP_MAX_OPT_LEN + MAX_HEADER)

#define DCCP_TIMEWAIT_LEN (60 * HZ) /* how long to wait to destroy TIME-WAIT
				     * state, about 60 seconds */

/* draft-ietf-dccp-spec-11.txt initial RTO value */
#define DCCP_TIMEOUT_INIT ((unsigned)(3 * HZ))

/* Maximal interval between probes for local resources.  */
#define DCCP_RESOURCE_PROBE_INTERVAL ((unsigned)(HZ / 2U))

#define DCCP_RTO_MAX ((unsigned)(120 * HZ)) /* FIXME: using TCP value */

/* is seq1 < seq2 ? */
static inline int before48(const u64 seq1, const u64 seq2)
{
	return (s64)((seq1 << 16) - (seq2 << 16)) < 0;
}

/* is seq1 > seq2 ? */
static inline int after48(const u64 seq1, const u64 seq2)
{
	return (s64)((seq2 << 16) - (seq1 << 16)) < 0;
}

/* is seq2 <= seq1 <= seq3 ? */
static inline int between48(const u64 seq1, const u64 seq2, const u64 seq3)
{
	return (seq3 << 16) - (seq2 << 16) >= (seq1 << 16) - (seq2 << 16);
}

static inline u64 max48(const u64 seq1, const u64 seq2)
{
	return after48(seq1, seq2) ? seq1 : seq2;
}

enum {
	DCCP_MIB_NUM = 0,
	DCCP_MIB_ACTIVEOPENS,			/* ActiveOpens */
	DCCP_MIB_ESTABRESETS,			/* EstabResets */
	DCCP_MIB_CURRESTAB,			/* CurrEstab */
	DCCP_MIB_OUTSEGS,			/* OutSegs */ 
	DCCP_MIB_OUTRSTS,
	DCCP_MIB_ABORTONTIMEOUT,
	DCCP_MIB_TIMEOUTS,
	DCCP_MIB_ABORTFAILED,
	DCCP_MIB_PASSIVEOPENS,
	DCCP_MIB_ATTEMPTFAILS,
	DCCP_MIB_OUTDATAGRAMS,
	DCCP_MIB_INERRS,
	DCCP_MIB_OPTMANDATORYERROR,
	DCCP_MIB_INVALIDOPT,
	__DCCP_MIB_MAX
};

#define DCCP_MIB_MAX	__DCCP_MIB_MAX
struct dccp_mib {
	unsigned long	mibs[DCCP_MIB_MAX];
} __SNMP_MIB_ALIGN__;

DECLARE_SNMP_STAT(struct dccp_mib, dccp_statistics);
#define DCCP_INC_STATS(field)	    SNMP_INC_STATS(dccp_statistics, field)
#define DCCP_INC_STATS_BH(field)    SNMP_INC_STATS_BH(dccp_statistics, field)
#define DCCP_INC_STATS_USER(field)  SNMP_INC_STATS_USER(dccp_statistics, field)
#define DCCP_DEC_STATS(field)	    SNMP_DEC_STATS(dccp_statistics, field)
#define DCCP_ADD_STATS_BH(field, val) \
			SNMP_ADD_STATS_BH(dccp_statistics, field, val)
#define DCCP_ADD_STATS_USER(field, val)	\
			SNMP_ADD_STATS_USER(dccp_statistics, field, val)

extern int  dccp_retransmit_skb(struct sock *sk, struct sk_buff *skb);

extern void dccp_send_ack(struct sock *sk);
extern void dccp_send_delayed_ack(struct sock *sk);
extern void dccp_send_sync(struct sock *sk, const u64 seq,
			   const enum dccp_pkt_type pkt_type);

extern int dccp_write_xmit(struct sock *sk, struct sk_buff *skb, long *timeo);
extern void dccp_write_space(struct sock *sk);

extern void dccp_init_xmit_timers(struct sock *sk);
static inline void dccp_clear_xmit_timers(struct sock *sk)
{
	inet_csk_clear_xmit_timers(sk);
}

extern unsigned int dccp_sync_mss(struct sock *sk, u32 pmtu);

extern const char *dccp_packet_name(const int type);
extern const char *dccp_state_name(const int state);

extern void dccp_set_state(struct sock *sk, const int state);
extern void dccp_done(struct sock *sk);

static inline void dccp_openreq_init(struct request_sock *req,
				     struct dccp_sock *dp,
				     struct sk_buff *skb)
{
	/*
	 * FIXME: fill in the other req fields from the DCCP options
	 * received
	 */
	inet_rsk(req)->rmt_port = dccp_hdr(skb)->dccph_sport;
	inet_rsk(req)->acked	= 0;
	req->rcv_wnd = 0;
}

extern int dccp_v4_conn_request(struct sock *sk, struct sk_buff *skb);

extern struct sock *dccp_create_openreq_child(struct sock *sk,
					      const struct request_sock *req,
					      const struct sk_buff *skb);

extern int dccp_v4_do_rcv(struct sock *sk, struct sk_buff *skb);

extern struct sock *dccp_v4_request_recv_sock(struct sock *sk,
					      struct sk_buff *skb,
					      struct request_sock *req,
					      struct dst_entry *dst);
extern struct sock *dccp_check_req(struct sock *sk, struct sk_buff *skb,
				   struct request_sock *req,
				   struct request_sock **prev);

extern int dccp_child_process(struct sock *parent, struct sock *child,
			      struct sk_buff *skb);
extern int dccp_rcv_state_process(struct sock *sk, struct sk_buff *skb,
				  struct dccp_hdr *dh, unsigned len);
extern int dccp_rcv_established(struct sock *sk, struct sk_buff *skb,
				const struct dccp_hdr *dh, const unsigned len);

extern int dccp_init_sock(struct sock *sk, const __u8 ctl_sock_initialized);
extern int dccp_destroy_sock(struct sock *sk);

extern void		dccp_close(struct sock *sk, long timeout);
extern struct sk_buff	*dccp_make_response(struct sock *sk,
					    struct dst_entry *dst,
					    struct request_sock *req);

extern int	   dccp_connect(struct sock *sk);
extern int	   dccp_disconnect(struct sock *sk, int flags);
extern void	   dccp_hash(struct sock *sk);
extern void	   dccp_unhash(struct sock *sk);
extern int	   dccp_getsockopt(struct sock *sk, int level, int optname,
				   char __user *optval, int __user *optlen);
extern int	   dccp_setsockopt(struct sock *sk, int level, int optname,
				   char __user *optval, int optlen);
#ifdef CONFIG_COMPAT
extern int	   compat_dccp_getsockopt(struct sock *sk,
				int level, int optname,
				char __user *optval, int __user *optlen);
extern int	   compat_dccp_setsockopt(struct sock *sk,
				int level, int optname,
				char __user *optval, int optlen);
#endif
extern int	   dccp_ioctl(struct sock *sk, int cmd, unsigned long arg);
extern int	   dccp_sendmsg(struct kiocb *iocb, struct sock *sk,
				struct msghdr *msg, size_t size);
extern int	   dccp_recvmsg(struct kiocb *iocb, struct sock *sk,
				struct msghdr *msg, size_t len, int nonblock,
				int flags, int *addr_len);
extern void	   dccp_shutdown(struct sock *sk, int how);
extern int	   inet_dccp_listen(struct socket *sock, int backlog);
extern unsigned int dccp_poll(struct file *file, struct socket *sock,
			     poll_table *wait);
extern void	   dccp_v4_send_check(struct sock *sk, int len,
				      struct sk_buff *skb);
extern int	   dccp_v4_connect(struct sock *sk, struct sockaddr *uaddr,
				   int addr_len);

extern int	   dccp_v4_checksum(const struct sk_buff *skb,
				    const __be32 saddr, const __be32 daddr);

extern int	   dccp_send_reset(struct sock *sk, enum dccp_reset_codes code);
extern void	   dccp_send_close(struct sock *sk, const int active);
extern int	   dccp_invalid_packet(struct sk_buff *skb);

static inline int dccp_bad_service_code(const struct sock *sk,
					const __be32 service)
{
	const struct dccp_sock *dp = dccp_sk(sk);

	if (dp->dccps_service == service)
		return 0;
	return !dccp_list_has_service(dp->dccps_service_list, service);
}

struct dccp_skb_cb {
	__u8  dccpd_type:4;
	__u8  dccpd_ccval:4;
	__u8  dccpd_reset_code;
	__u16 dccpd_opt_len;
	__u64 dccpd_seq;
	__u64 dccpd_ack_seq;
};

#define DCCP_SKB_CB(__skb) ((struct dccp_skb_cb *)&((__skb)->cb[0]))

static inline int dccp_non_data_packet(const struct sk_buff *skb)
{
	const __u8 type = DCCP_SKB_CB(skb)->dccpd_type;

	return type == DCCP_PKT_ACK	 ||
	       type == DCCP_PKT_CLOSE	 ||
	       type == DCCP_PKT_CLOSEREQ ||
	       type == DCCP_PKT_RESET	 ||
	       type == DCCP_PKT_SYNC	 ||
	       type == DCCP_PKT_SYNCACK;
}

static inline int dccp_packet_without_ack(const struct sk_buff *skb)
{
	const __u8 type = DCCP_SKB_CB(skb)->dccpd_type;

	return type == DCCP_PKT_DATA || type == DCCP_PKT_REQUEST;
}

#define DCCP_MAX_SEQNO ((((u64)1) << 48) - 1)
#define DCCP_PKT_WITHOUT_ACK_SEQ (DCCP_MAX_SEQNO << 2)

static inline void dccp_set_seqno(u64 *seqno, u64 value)
{
	if (value > DCCP_MAX_SEQNO)
		value -= DCCP_MAX_SEQNO + 1;
	*seqno = value;
}

static inline u64 dccp_delta_seqno(u64 seqno1, u64 seqno2)
{
	return ((seqno2 << 16) - (seqno1 << 16)) >> 16;
}

static inline void dccp_inc_seqno(u64 *seqno)
{
	if (++*seqno > DCCP_MAX_SEQNO)
		*seqno = 0;
}

static inline void dccp_hdr_set_seq(struct dccp_hdr *dh, const u64 gss)
{
	struct dccp_hdr_ext *dhx = (struct dccp_hdr_ext *)((void *)dh +
							   sizeof(*dh));
	dh->dccph_seq2 = 0;
	dh->dccph_seq = htons((gss >> 32) & 0xfffff);
	dhx->dccph_seq_low = htonl(gss & 0xffffffff);
}

static inline void dccp_hdr_set_ack(struct dccp_hdr_ack_bits *dhack,
				    const u64 gsr)
{
	dhack->dccph_reserved1 = 0;
	dhack->dccph_ack_nr_high = htons(gsr >> 32);
	dhack->dccph_ack_nr_low  = htonl(gsr & 0xffffffff);
}

static inline void dccp_update_gsr(struct sock *sk, u64 seq)
{
	struct dccp_sock *dp = dccp_sk(sk);
	const struct dccp_minisock *dmsk = dccp_msk(sk);

	dp->dccps_gsr = seq;
	dccp_set_seqno(&dp->dccps_swl,
		       dp->dccps_gsr + 1 - (dmsk->dccpms_sequence_window / 4));
	dccp_set_seqno(&dp->dccps_swh,
		       dp->dccps_gsr + (3 * dmsk->dccpms_sequence_window) / 4);
}

static inline void dccp_update_gss(struct sock *sk, u64 seq)
{
	struct dccp_sock *dp = dccp_sk(sk);

	dp->dccps_awh = dp->dccps_gss = seq;
	dccp_set_seqno(&dp->dccps_awl,
		       (dp->dccps_gss -
			dccp_msk(sk)->dccpms_sequence_window + 1));
}
				
static inline int dccp_ack_pending(const struct sock *sk)
{
	const struct dccp_sock *dp = dccp_sk(sk);
	return dp->dccps_timestamp_echo != 0 ||
#ifdef CONFIG_IP_DCCP_ACKVEC
	       (dccp_msk(sk)->dccpms_send_ack_vector &&
		dccp_ackvec_pending(dp->dccps_hc_rx_ackvec)) ||
#endif
	       inet_csk_ack_scheduled(sk);
}

extern int dccp_insert_options(struct sock *sk, struct sk_buff *skb);
extern int dccp_insert_option_elapsed_time(struct sock *sk,
					    struct sk_buff *skb,
					    u32 elapsed_time);
extern int dccp_insert_option_timestamp(struct sock *sk,
					 struct sk_buff *skb);
extern int dccp_insert_option(struct sock *sk, struct sk_buff *skb,
			       unsigned char option,
			       const void *value, unsigned char len);

extern void dccp_timestamp(const struct sock *sk, struct timeval *tv);

static inline suseconds_t timeval_usecs(const struct timeval *tv)
{
	return tv->tv_sec * USEC_PER_SEC + tv->tv_usec;
}

static inline suseconds_t timeval_delta(const struct timeval *large,
					const struct timeval *small)
{
	time_t	    secs  = large->tv_sec  - small->tv_sec;
	suseconds_t usecs = large->tv_usec - small->tv_usec;

	if (usecs < 0) {
		secs--;
		usecs += USEC_PER_SEC;
	}
	return secs * USEC_PER_SEC + usecs;
}

static inline void timeval_add_usecs(struct timeval *tv,
				     const suseconds_t usecs)
{
	tv->tv_usec += usecs;
	while (tv->tv_usec >= USEC_PER_SEC) {
		tv->tv_sec++;
		tv->tv_usec -= USEC_PER_SEC;
	}
}

static inline void timeval_sub_usecs(struct timeval *tv,
				     const suseconds_t usecs)
{
	tv->tv_usec -= usecs;
	while (tv->tv_usec < 0) {
		tv->tv_sec--;
		tv->tv_usec += USEC_PER_SEC;
	}
}

#ifdef CONFIG_SYSCTL
extern int dccp_sysctl_init(void);
extern void dccp_sysctl_exit(void);
#else
static inline int dccp_sysctl_init(void)
{
	return 0;
}

static inline void dccp_sysctl_exit(void)
{
}
#endif

#endif /* _DCCP_H */
Commit	Line	Data
7c657876 ACM	1	#ifndef _DCCP_H
	2	#define _DCCP_H
	3	/*
	4	* net/dccp/dccp.h
	5	*
	6	* An implementation of the DCCP protocol
1bc09869	7	* Copyright (c) 2005 Arnaldo Carvalho de Melo <acme@conectiva.com.br>
e6bccd35	8	* Copyright (c) 2005-6 Ian McDonald <ian.mcdonald@jandi.co.nz>
7c657876 ACM	9	*
	10	* This program is free software; you can redistribute it and/or modify it
	11	* under the terms of the GNU General Public License version 2 as
	12	* published by the Free Software Foundation.
	13	*/
	14
	15	#include <linux/dccp.h>
	16	#include <net/snmp.h>
	17	#include <net/sock.h>
	18	#include <net/tcp.h>
ae31c339	19	#include "ackvec.h"
7c657876	20
725ba8ee	21	#ifdef CONFIG_IP_DCCP_DEBUG
7c657876 ACM	22	extern int dccp_debug;
	23
	24	#define dccp_pr_debug(format, a...) \
	25	do { if (dccp_debug) \
	26	printk(KERN_DEBUG "%s: " format, __FUNCTION__ , ##a); \
	27	} while (0)
7690af3f ACM	28	#define dccp_pr_debug_cat(format, a...) do { if (dccp_debug) \
7690af3f ACM	29	printk(format, ##a); } while (0)
7c657876 ACM	30	#else
	31	#define dccp_pr_debug(format, a...)
	32	#define dccp_pr_debug_cat(format, a...)
	33	#endif
	34
	35	extern struct inet_hashinfo dccp_hashinfo;
	36
	37	extern atomic_t dccp_orphan_count;
	38	extern int dccp_tw_count;
	39	extern void dccp_tw_deschedule(struct inet_timewait_sock *tw);
	40
	41	extern void dccp_time_wait(struct sock *sk, int state, int timeo);
	42
	43	/* FIXME: Right size this */
	44	#define DCCP_MAX_OPT_LEN 128
	45
	46	#define DCCP_MAX_PACKET_HDR 32
	47
	48	#define MAX_DCCP_HEADER (DCCP_MAX_PACKET_HDR + DCCP_MAX_OPT_LEN + MAX_HEADER)
	49
	50	#define DCCP_TIMEWAIT_LEN (60 * HZ) /* how long to wait to destroy TIME-WAIT
	51	* state, about 60 seconds */
	52
	53	/* draft-ietf-dccp-spec-11.txt initial RTO value */
	54	#define DCCP_TIMEOUT_INIT ((unsigned)(3 * HZ))
	55
	56	/* Maximal interval between probes for local resources. */
	57	#define DCCP_RESOURCE_PROBE_INTERVAL ((unsigned)(HZ / 2U))
	58
	59	#define DCCP_RTO_MAX ((unsigned)(120 * HZ)) /* FIXME: using TCP value */
	60
7c657876	61	/* is seq1 < seq2 ? */
a10cedd4	62	static inline int before48(const u64 seq1, const u64 seq2)
7c657876	63	{
a10cedd4	64	return (s64)((seq1 << 16) - (seq2 << 16)) < 0;
7c657876 ACM	65	}
	66
	67	/* is seq1 > seq2 ? */
a10cedd4	68	static inline int after48(const u64 seq1, const u64 seq2)
7c657876	69	{
a10cedd4	70	return (s64)((seq2 << 16) - (seq1 << 16)) < 0;
7c657876 ACM	71	}
	72
	73	/* is seq2 <= seq1 <= seq3 ? */
a10cedd4	74	static inline int between48(const u64 seq1, const u64 seq2, const u64 seq3)
7c657876 ACM	75	{
	76	return (seq3 << 16) - (seq2 << 16) >= (seq1 << 16) - (seq2 << 16);
	77	}
	78
	79	static inline u64 max48(const u64 seq1, const u64 seq2)
	80	{
	81	return after48(seq1, seq2) ? seq1 : seq2;
	82	}
	83
	84	enum {
	85	DCCP_MIB_NUM = 0,
	86	DCCP_MIB_ACTIVEOPENS, /* ActiveOpens */
	87	DCCP_MIB_ESTABRESETS, /* EstabResets */
	88	DCCP_MIB_CURRESTAB, /* CurrEstab */
	89	DCCP_MIB_OUTSEGS, /* OutSegs */
	90	DCCP_MIB_OUTRSTS,
	91	DCCP_MIB_ABORTONTIMEOUT,
	92	DCCP_MIB_TIMEOUTS,
	93	DCCP_MIB_ABORTFAILED,
	94	DCCP_MIB_PASSIVEOPENS,
	95	DCCP_MIB_ATTEMPTFAILS,
	96	DCCP_MIB_OUTDATAGRAMS,
	97	DCCP_MIB_INERRS,
	98	DCCP_MIB_OPTMANDATORYERROR,
	99	DCCP_MIB_INVALIDOPT,
	100	__DCCP_MIB_MAX
	101	};
	102
	103	#define DCCP_MIB_MAX __DCCP_MIB_MAX
	104	struct dccp_mib {
	105	unsigned long mibs[DCCP_MIB_MAX];
	106	} __SNMP_MIB_ALIGN__;
	107
	108	DECLARE_SNMP_STAT(struct dccp_mib, dccp_statistics);
7690af3f ACM	109	#define DCCP_INC_STATS(field) SNMP_INC_STATS(dccp_statistics, field)
	110	#define DCCP_INC_STATS_BH(field) SNMP_INC_STATS_BH(dccp_statistics, field)
	111	#define DCCP_INC_STATS_USER(field) SNMP_INC_STATS_USER(dccp_statistics, field)
	112	#define DCCP_DEC_STATS(field) SNMP_DEC_STATS(dccp_statistics, field)
	113	#define DCCP_ADD_STATS_BH(field, val) \
	114	SNMP_ADD_STATS_BH(dccp_statistics, field, val)
	115	#define DCCP_ADD_STATS_USER(field, val) \
	116	SNMP_ADD_STATS_USER(dccp_statistics, field, val)
7c657876	117
7c657876 ACM	118	extern int dccp_retransmit_skb(struct sock sk, struct sk_buff skb);
7c657876 ACM	119
7c657876 ACM	120	extern void dccp_send_ack(struct sock *sk);
7c657876 ACM	121	extern void dccp_send_delayed_ack(struct sock *sk);
e92ae93a ACM	122	extern void dccp_send_sync(struct sock *sk, const u64 seq,
e92ae93a ACM	123	const enum dccp_pkt_type pkt_type);
7c657876	124
d6809c12	125	extern int dccp_write_xmit(struct sock sk, struct sk_buff skb, long *timeo);
c530cfb1	126	extern void dccp_write_space(struct sock *sk);
27258ee5	127
7c657876 ACM	128	extern void dccp_init_xmit_timers(struct sock *sk);
	129	static inline void dccp_clear_xmit_timers(struct sock *sk)
	130	{
	131	inet_csk_clear_xmit_timers(sk);
	132	}
	133
	134	extern unsigned int dccp_sync_mss(struct sock *sk, u32 pmtu);
	135
	136	extern const char *dccp_packet_name(const int type);
	137	extern const char *dccp_state_name(const int state);
	138
c25a18ba ACM	139	extern void dccp_set_state(struct sock *sk, const int state);
c25a18ba ACM	140	extern void dccp_done(struct sock *sk);
7c657876 ACM	141
	142	static inline void dccp_openreq_init(struct request_sock *req,
	143	struct dccp_sock *dp,
	144	struct sk_buff *skb)
	145	{
	146	/*
	147	* FIXME: fill in the other req fields from the DCCP options
	148	* received
	149	*/
	150	inet_rsk(req)->rmt_port = dccp_hdr(skb)->dccph_sport;
	151	inet_rsk(req)->acked = 0;
	152	req->rcv_wnd = 0;
	153	}
	154
7c657876 ACM	155	extern int dccp_v4_conn_request(struct sock sk, struct sk_buff skb);
	156
	157	extern struct sock dccp_create_openreq_child(struct sock sk,
	158	const struct request_sock *req,
	159	const struct sk_buff *skb);
	160
	161	extern int dccp_v4_do_rcv(struct sock sk, struct sk_buff skb);
	162
7c657876 ACM	163	extern struct sock dccp_v4_request_recv_sock(struct sock sk,
	164	struct sk_buff *skb,
	165	struct request_sock *req,
	166	struct dst_entry *dst);
	167	extern struct sock dccp_check_req(struct sock sk, struct sk_buff *skb,
	168	struct request_sock *req,
	169	struct request_sock **prev);
	170
	171	extern int dccp_child_process(struct sock parent, struct sock child,
	172	struct sk_buff *skb);
	173	extern int dccp_rcv_state_process(struct sock sk, struct sk_buff skb,
	174	struct dccp_hdr *dh, unsigned len);
	175	extern int dccp_rcv_established(struct sock sk, struct sk_buff skb,
	176	const struct dccp_hdr *dh, const unsigned len);
	177
72478873	178	extern int dccp_init_sock(struct sock *sk, const __u8 ctl_sock_initialized);
3e0fadc5	179	extern int dccp_destroy_sock(struct sock *sk);
f21e68ca	180
7c657876 ACM	181	extern void dccp_close(struct sock *sk, long timeout);
	182	extern struct sk_buff dccp_make_response(struct sock sk,
	183	struct dst_entry *dst,
	184	struct request_sock *req);
	185
	186	extern int dccp_connect(struct sock *sk);
	187	extern int dccp_disconnect(struct sock *sk, int flags);
c985ed70	188	extern void dccp_hash(struct sock *sk);
f21e68ca	189	extern void dccp_unhash(struct sock *sk);
7c657876	190	extern int dccp_getsockopt(struct sock *sk, int level, int optname,
a1d3a355 ACM	191	char __user optval, int __user optlen);
	192	extern int dccp_setsockopt(struct sock *sk, int level, int optname,
	193	char __user *optval, int optlen);
3fdadf7d DM	194	#ifdef CONFIG_COMPAT
	195	extern int compat_dccp_getsockopt(struct sock *sk,
	196	int level, int optname,
	197	char __user optval, int __user optlen);
	198	extern int compat_dccp_setsockopt(struct sock *sk,
	199	int level, int optname,
	200	char __user *optval, int optlen);
	201	#endif
7c657876	202	extern int dccp_ioctl(struct sock *sk, int cmd, unsigned long arg);
7690af3f ACM	203	extern int dccp_sendmsg(struct kiocb iocb, struct sock sk,
7690af3f ACM	204	struct msghdr *msg, size_t size);
7c657876 ACM	205	extern int dccp_recvmsg(struct kiocb iocb, struct sock sk,
	206	struct msghdr *msg, size_t len, int nonblock,
	207	int flags, int *addr_len);
7c657876	208	extern void dccp_shutdown(struct sock *sk, int how);
f21e68ca ACM	209	extern int inet_dccp_listen(struct socket *sock, int backlog);
	210	extern unsigned int dccp_poll(struct file file, struct socket sock,
	211	poll_table *wait);
	212	extern void dccp_v4_send_check(struct sock *sk, int len,
	213	struct sk_buff *skb);
	214	extern int dccp_v4_connect(struct sock sk, struct sockaddr uaddr,
	215	int addr_len);
7c657876	216
95b81ef7	217	extern int dccp_v4_checksum(const struct sk_buff *skb,
60fe62e7	218	const __be32 saddr, const __be32 daddr);
7c657876	219
017487d7	220	extern int dccp_send_reset(struct sock *sk, enum dccp_reset_codes code);
7ad07e7c	221	extern void dccp_send_close(struct sock *sk, const int active);
f21e68ca ACM	222	extern int dccp_invalid_packet(struct sk_buff *skb);
	223
	224	static inline int dccp_bad_service_code(const struct sock *sk,
60fe62e7	225	const __be32 service)
f21e68ca ACM	226	{
	227	const struct dccp_sock *dp = dccp_sk(sk);
	228
	229	if (dp->dccps_service == service)
	230	return 0;
	231	return !dccp_list_has_service(dp->dccps_service_list, service);
	232	}
7c657876 ACM	233
7c657876 ACM	234	struct dccp_skb_cb {
67e6b629 ACM	235	__u8 dccpd_type:4;
	236	__u8 dccpd_ccval:4;
	237	__u8 dccpd_reset_code;
	238	__u16 dccpd_opt_len;
7c657876 ACM	239	__u64 dccpd_seq;
7c657876 ACM	240	__u64 dccpd_ack_seq;
7c657876 ACM	241	};
	242
	243	#define DCCP_SKB_CB(__skb) ((struct dccp_skb_cb *)&((__skb)->cb[0]))
	244
	245	static inline int dccp_non_data_packet(const struct sk_buff *skb)
	246	{
	247	const __u8 type = DCCP_SKB_CB(skb)->dccpd_type;
	248
	249	return type == DCCP_PKT_ACK \|\|
	250	type == DCCP_PKT_CLOSE \|\|
	251	type == DCCP_PKT_CLOSEREQ \|\|
	252	type == DCCP_PKT_RESET \|\|
	253	type == DCCP_PKT_SYNC \|\|
	254	type == DCCP_PKT_SYNCACK;
	255	}
	256
	257	static inline int dccp_packet_without_ack(const struct sk_buff *skb)
	258	{
	259	const __u8 type = DCCP_SKB_CB(skb)->dccpd_type;
	260
	261	return type == DCCP_PKT_DATA \|\| type == DCCP_PKT_REQUEST;
	262	}
	263
	264	#define DCCP_MAX_SEQNO ((((u64)1) << 48) - 1)
	265	#define DCCP_PKT_WITHOUT_ACK_SEQ (DCCP_MAX_SEQNO << 2)
	266
	267	static inline void dccp_set_seqno(u64 *seqno, u64 value)
	268	{
	269	if (value > DCCP_MAX_SEQNO)
	270	value -= DCCP_MAX_SEQNO + 1;
	271	*seqno = value;
	272	}
	273
	274	static inline u64 dccp_delta_seqno(u64 seqno1, u64 seqno2)
	275	{
	276	return ((seqno2 << 16) - (seqno1 << 16)) >> 16;
	277	}
	278
	279	static inline void dccp_inc_seqno(u64 *seqno)
	280	{
	281	if (++*seqno > DCCP_MAX_SEQNO)
	282	*seqno = 0;
	283	}
	284
	285	static inline void dccp_hdr_set_seq(struct dccp_hdr *dh, const u64 gss)
	286	{
7690af3f ACM	287	struct dccp_hdr_ext dhx = (struct dccp_hdr_ext )((void *)dh +
7690af3f ACM	288	sizeof(*dh));
60fe62e7 AB	289	dh->dccph_seq2 = 0;
60fe62e7 AB	290	dh->dccph_seq = htons((gss >> 32) & 0xfffff);
7c657876 ACM	291	dhx->dccph_seq_low = htonl(gss & 0xffffffff);
	292	}
	293
7690af3f ACM	294	static inline void dccp_hdr_set_ack(struct dccp_hdr_ack_bits *dhack,
7690af3f ACM	295	const u64 gsr)
7c657876	296	{
60fe62e7 AB	297	dhack->dccph_reserved1 = 0;
60fe62e7 AB	298	dhack->dccph_ack_nr_high = htons(gsr >> 32);
7c657876 ACM	299	dhack->dccph_ack_nr_low = htonl(gsr & 0xffffffff);
	300	}
	301
	302	static inline void dccp_update_gsr(struct sock *sk, u64 seq)
	303	{
	304	struct dccp_sock *dp = dccp_sk(sk);
a4bf3902	305	const struct dccp_minisock *dmsk = dccp_msk(sk);
7c657876	306
03ace394 ACM	307	dp->dccps_gsr = seq;
03ace394 ACM	308	dccp_set_seqno(&dp->dccps_swl,
a4bf3902	309	dp->dccps_gsr + 1 - (dmsk->dccpms_sequence_window / 4));
7c657876	310	dccp_set_seqno(&dp->dccps_swh,
a4bf3902	311	dp->dccps_gsr + (3 * dmsk->dccpms_sequence_window) / 4);
7c657876 ACM	312	}
	313
	314	static inline void dccp_update_gss(struct sock *sk, u64 seq)
	315	{
	316	struct dccp_sock *dp = dccp_sk(sk);
7c657876	317
03ace394 ACM	318	dp->dccps_awh = dp->dccps_gss = seq;
03ace394 ACM	319	dccp_set_seqno(&dp->dccps_awl,
7690af3f	320	(dp->dccps_gss -
a4bf3902	321	dccp_msk(sk)->dccpms_sequence_window + 1));
7c657876	322	}
ae31c339 ACM	323
	324	static inline int dccp_ack_pending(const struct sock *sk)
	325	{
	326	const struct dccp_sock *dp = dccp_sk(sk);
	327	return dp->dccps_timestamp_echo != 0 \|\|
	328	#ifdef CONFIG_IP_DCCP_ACKVEC
a4bf3902	329	(dccp_msk(sk)->dccpms_send_ack_vector &&
ae31c339 ACM	330	dccp_ackvec_pending(dp->dccps_hc_rx_ackvec)) \|\|
	331	#endif
	332	inet_csk_ack_scheduled(sk);
	333	}
7c657876	334
2d0817d1 ACM	335	extern int dccp_insert_options(struct sock sk, struct sk_buff skb);
2d0817d1 ACM	336	extern int dccp_insert_option_elapsed_time(struct sock *sk,
7c657876 ACM	337	struct sk_buff *skb,
7c657876 ACM	338	u32 elapsed_time);
2d0817d1	339	extern int dccp_insert_option_timestamp(struct sock *sk,
d4b81ff7	340	struct sk_buff *skb);
2d0817d1	341	extern int dccp_insert_option(struct sock sk, struct sk_buff skb,
7c657876 ACM	342	unsigned char option,
	343	const void *value, unsigned char len);
	344
b0e56780 ACM	345	extern void dccp_timestamp(const struct sock sk, struct timeval tv);
b0e56780 ACM	346
b6ee3d4a ACM	347	static inline suseconds_t timeval_usecs(const struct timeval *tv)
	348	{
	349	return tv->tv_sec * USEC_PER_SEC + tv->tv_usec;
	350	}
	351
	352	static inline suseconds_t timeval_delta(const struct timeval *large,
	353	const struct timeval *small)
	354	{
	355	time_t secs = large->tv_sec - small->tv_sec;
	356	suseconds_t usecs = large->tv_usec - small->tv_usec;
	357
	358	if (usecs < 0) {
	359	secs--;
	360	usecs += USEC_PER_SEC;
	361	}
	362	return secs * USEC_PER_SEC + usecs;
	363	}
	364
	365	static inline void timeval_add_usecs(struct timeval *tv,
	366	const suseconds_t usecs)
	367	{
	368	tv->tv_usec += usecs;
	369	while (tv->tv_usec >= USEC_PER_SEC) {
	370	tv->tv_sec++;
	371	tv->tv_usec -= USEC_PER_SEC;
	372	}
	373	}
	374
	375	static inline void timeval_sub_usecs(struct timeval *tv,
	376	const suseconds_t usecs)
	377	{
	378	tv->tv_usec -= usecs;
	379	while (tv->tv_usec < 0) {
	380	tv->tv_sec--;
	381	tv->tv_usec += USEC_PER_SEC;
	382	}
	383	}
	384
e55d912f ACM	385	#ifdef CONFIG_SYSCTL
	386	extern int dccp_sysctl_init(void);
	387	extern void dccp_sysctl_exit(void);
	388	#else
	389	static inline int dccp_sysctl_init(void)
	390	{
	391	return 0;
	392	}
	393
	394	static inline void dccp_sysctl_exit(void)
	395	{
	396	}
	397	#endif
	398
7c657876	399	#endif /* _DCCP_H */