[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 Ian McDonald <iam4@cs.waikato.ac.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/config.h>
#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 int dccp_send_response(struct sock *sk);
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);

static inline void dccp_set_state(struct sock *sk, const int state)
{
	const int oldstate = sk->sk_state;

	dccp_pr_debug("%s(%p) %-10.10s -> %s\n",
		      dccp_role(sk), sk,
		      dccp_state_name(oldstate), dccp_state_name(state));
	WARN_ON(state == oldstate);

	switch (state) {
	case DCCP_OPEN:
		if (oldstate != DCCP_OPEN)
			DCCP_INC_STATS(DCCP_MIB_CURRESTAB);
		break;

	case DCCP_CLOSED:
		if (oldstate == DCCP_CLOSING || oldstate == DCCP_OPEN)
			DCCP_INC_STATS(DCCP_MIB_ESTABRESETS);

		sk->sk_prot->unhash(sk);
		if (inet_csk(sk)->icsk_bind_hash != NULL &&
		    !(sk->sk_userlocks & SOCK_BINDPORT_LOCK))
			inet_put_port(&dccp_hashinfo, sk);
		/* fall through */
	default:
		if (oldstate == DCCP_OPEN)
			DCCP_DEC_STATS(DCCP_MIB_CURRESTAB);
	}

	/* Change state AFTER socket is unhashed to avoid closed
	 * socket sitting in hash tables.
	 */
	sk->sk_state = state;
}

static inline void dccp_done(struct sock *sk)
{
	dccp_set_state(sk, DCCP_CLOSED);
	dccp_clear_xmit_timers(sk);

	sk->sk_shutdown = SHUTDOWN_MASK;

	if (!sock_flag(sk, SOCK_DEAD))
		sk->sk_state_change(sk);
	else
		inet_csk_destroy_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);
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);
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);

	dp->dccps_gsr = seq;
	dccp_set_seqno(&dp->dccps_swl,
		       (dp->dccps_gsr + 1 -
		        (dp->dccps_options.dccpo_sequence_window / 4)));
	dccp_set_seqno(&dp->dccps_swh,
		       (dp->dccps_gsr +
			(3 * dp->dccps_options.dccpo_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 -
			dp->dccps_options.dccpo_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
	       (dp->dccps_options.dccpo_send_ack_vector &&
		dccp_ackvec_pending(dp->dccps_hc_rx_ackvec)) ||
#endif
	       inet_csk_ack_scheduled(sk);
}

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

extern struct socket *dccp_ctl_socket;

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 IM	7	* Copyright (c) 2005 Arnaldo Carvalho de Melo <acme@conectiva.com.br>
1bc09869 IM	8	* Copyright (c) 2005 Ian McDonald <iam4@cs.waikato.ac.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
725ba8ee	15	#include <linux/config.h>
7c657876 ACM	16	#include <linux/dccp.h>
	17	#include <net/snmp.h>
	18	#include <net/sock.h>
	19	#include <net/tcp.h>
ae31c339	20	#include "ackvec.h"
7c657876	21
725ba8ee	22	#ifdef CONFIG_IP_DCCP_DEBUG
7c657876 ACM	23	extern int dccp_debug;
	24
	25	#define dccp_pr_debug(format, a...) \
	26	do { if (dccp_debug) \
	27	printk(KERN_DEBUG "%s: " format, __FUNCTION__ , ##a); \
	28	} while (0)
7690af3f ACM	29	#define dccp_pr_debug_cat(format, a...) do { if (dccp_debug) \
7690af3f ACM	30	printk(format, ##a); } while (0)
7c657876 ACM	31	#else
	32	#define dccp_pr_debug(format, a...)
	33	#define dccp_pr_debug_cat(format, a...)
	34	#endif
	35
	36	extern struct inet_hashinfo dccp_hashinfo;
	37
	38	extern atomic_t dccp_orphan_count;
	39	extern int dccp_tw_count;
	40	extern void dccp_tw_deschedule(struct inet_timewait_sock *tw);
	41
	42	extern void dccp_time_wait(struct sock *sk, int state, int timeo);
	43
	44	/* FIXME: Right size this */
	45	#define DCCP_MAX_OPT_LEN 128
	46
	47	#define DCCP_MAX_PACKET_HDR 32
	48
	49	#define MAX_DCCP_HEADER (DCCP_MAX_PACKET_HDR + DCCP_MAX_OPT_LEN + MAX_HEADER)
	50
	51	#define DCCP_TIMEWAIT_LEN (60 * HZ) /* how long to wait to destroy TIME-WAIT
	52	* state, about 60 seconds */
	53
	54	/* draft-ietf-dccp-spec-11.txt initial RTO value */
	55	#define DCCP_TIMEOUT_INIT ((unsigned)(3 * HZ))
	56
	57	/* Maximal interval between probes for local resources. */
	58	#define DCCP_RESOURCE_PROBE_INTERVAL ((unsigned)(HZ / 2U))
	59
	60	#define DCCP_RTO_MAX ((unsigned)(120 * HZ)) /* FIXME: using TCP value */
	61
7c657876	62	/* is seq1 < seq2 ? */
a10cedd4	63	static inline int before48(const u64 seq1, const u64 seq2)
7c657876	64	{
a10cedd4	65	return (s64)((seq1 << 16) - (seq2 << 16)) < 0;
7c657876 ACM	66	}
	67
	68	/* is seq1 > seq2 ? */
a10cedd4	69	static inline int after48(const u64 seq1, const u64 seq2)
7c657876	70	{
a10cedd4	71	return (s64)((seq2 << 16) - (seq1 << 16)) < 0;
7c657876 ACM	72	}
	73
	74	/* is seq2 <= seq1 <= seq3 ? */
a10cedd4	75	static inline int between48(const u64 seq1, const u64 seq2, const u64 seq3)
7c657876 ACM	76	{
	77	return (seq3 << 16) - (seq2 << 16) >= (seq1 << 16) - (seq2 << 16);
	78	}
	79
	80	static inline u64 max48(const u64 seq1, const u64 seq2)
	81	{
	82	return after48(seq1, seq2) ? seq1 : seq2;
	83	}
	84
	85	enum {
	86	DCCP_MIB_NUM = 0,
	87	DCCP_MIB_ACTIVEOPENS, /* ActiveOpens */
	88	DCCP_MIB_ESTABRESETS, /* EstabResets */
	89	DCCP_MIB_CURRESTAB, /* CurrEstab */
	90	DCCP_MIB_OUTSEGS, /* OutSegs */
	91	DCCP_MIB_OUTRSTS,
	92	DCCP_MIB_ABORTONTIMEOUT,
	93	DCCP_MIB_TIMEOUTS,
	94	DCCP_MIB_ABORTFAILED,
	95	DCCP_MIB_PASSIVEOPENS,
	96	DCCP_MIB_ATTEMPTFAILS,
	97	DCCP_MIB_OUTDATAGRAMS,
	98	DCCP_MIB_INERRS,
	99	DCCP_MIB_OPTMANDATORYERROR,
	100	DCCP_MIB_INVALIDOPT,
	101	__DCCP_MIB_MAX
	102	};
	103
	104	#define DCCP_MIB_MAX __DCCP_MIB_MAX
	105	struct dccp_mib {
	106	unsigned long mibs[DCCP_MIB_MAX];
	107	} __SNMP_MIB_ALIGN__;
	108
	109	DECLARE_SNMP_STAT(struct dccp_mib, dccp_statistics);
7690af3f ACM	110	#define DCCP_INC_STATS(field) SNMP_INC_STATS(dccp_statistics, field)
	111	#define DCCP_INC_STATS_BH(field) SNMP_INC_STATS_BH(dccp_statistics, field)
	112	#define DCCP_INC_STATS_USER(field) SNMP_INC_STATS_USER(dccp_statistics, field)
	113	#define DCCP_DEC_STATS(field) SNMP_DEC_STATS(dccp_statistics, field)
	114	#define DCCP_ADD_STATS_BH(field, val) \
	115	SNMP_ADD_STATS_BH(dccp_statistics, field, val)
	116	#define DCCP_ADD_STATS_USER(field, val) \
	117	SNMP_ADD_STATS_USER(dccp_statistics, field, val)
7c657876	118
7c657876 ACM	119	extern int dccp_retransmit_skb(struct sock sk, struct sk_buff skb);
	120
	121	extern int dccp_send_response(struct sock *sk);
	122	extern void dccp_send_ack(struct sock *sk);
	123	extern void dccp_send_delayed_ack(struct sock *sk);
e92ae93a ACM	124	extern void dccp_send_sync(struct sock *sk, const u64 seq,
e92ae93a ACM	125	const enum dccp_pkt_type pkt_type);
7c657876	126
d6809c12	127	extern int dccp_write_xmit(struct sock sk, struct sk_buff skb, long *timeo);
c530cfb1	128	extern void dccp_write_space(struct sock *sk);
27258ee5	129
7c657876 ACM	130	extern void dccp_init_xmit_timers(struct sock *sk);
	131	static inline void dccp_clear_xmit_timers(struct sock *sk)
	132	{
	133	inet_csk_clear_xmit_timers(sk);
	134	}
	135
	136	extern unsigned int dccp_sync_mss(struct sock *sk, u32 pmtu);
	137
	138	extern const char *dccp_packet_name(const int type);
	139	extern const char *dccp_state_name(const int state);
	140
	141	static inline void dccp_set_state(struct sock *sk, const int state)
	142	{
	143	const int oldstate = sk->sk_state;
	144
	145	dccp_pr_debug("%s(%p) %-10.10s -> %s\n",
	146	dccp_role(sk), sk,
	147	dccp_state_name(oldstate), dccp_state_name(state));
	148	WARN_ON(state == oldstate);
	149
	150	switch (state) {
	151	case DCCP_OPEN:
	152	if (oldstate != DCCP_OPEN)
	153	DCCP_INC_STATS(DCCP_MIB_CURRESTAB);
	154	break;
	155
	156	case DCCP_CLOSED:
	157	if (oldstate == DCCP_CLOSING \|\| oldstate == DCCP_OPEN)
	158	DCCP_INC_STATS(DCCP_MIB_ESTABRESETS);
	159
	160	sk->sk_prot->unhash(sk);
	161	if (inet_csk(sk)->icsk_bind_hash != NULL &&
	162	!(sk->sk_userlocks & SOCK_BINDPORT_LOCK))
	163	inet_put_port(&dccp_hashinfo, sk);
	164	/* fall through */
	165	default:
	166	if (oldstate == DCCP_OPEN)
	167	DCCP_DEC_STATS(DCCP_MIB_CURRESTAB);
	168	}
	169
	170	/* Change state AFTER socket is unhashed to avoid closed
	171	* socket sitting in hash tables.
	172	*/
	173	sk->sk_state = state;
	174	}
	175
	176	static inline void dccp_done(struct sock *sk)
	177	{
	178	dccp_set_state(sk, DCCP_CLOSED);
	179	dccp_clear_xmit_timers(sk);
	180
	181	sk->sk_shutdown = SHUTDOWN_MASK;
	182
	183	if (!sock_flag(sk, SOCK_DEAD))
	184	sk->sk_state_change(sk);
	185	else
	186	inet_csk_destroy_sock(sk);
	187	}
	188
	189	static inline void dccp_openreq_init(struct request_sock *req,
	190	struct dccp_sock *dp,
	191	struct sk_buff *skb)
	192	{
	193	/*
194	* FIXME: fill in the other req fields from the DCCP options
195	* received
196	*/
197	inet_rsk(req)->rmt_port = dccp_hdr(skb)->dccph_sport;
198	inet_rsk(req)->acked = 0;
199	req->rcv_wnd = 0;
200	}
201
7c657876 ACM	202	extern int dccp_v4_conn_request(struct sock sk, struct sk_buff skb);
	203
	204	extern struct sock dccp_create_openreq_child(struct sock sk,
	205	const struct request_sock *req,
	206	const struct sk_buff *skb);
	207
	208	extern int dccp_v4_do_rcv(struct sock sk, struct sk_buff skb);
	209
7c657876 ACM	210	extern struct sock dccp_v4_request_recv_sock(struct sock sk,
	211	struct sk_buff *skb,
	212	struct request_sock *req,
	213	struct dst_entry *dst);
	214	extern struct sock dccp_check_req(struct sock sk, struct sk_buff *skb,
	215	struct request_sock *req,
	216	struct request_sock **prev);
	217
	218	extern int dccp_child_process(struct sock parent, struct sock child,
	219	struct sk_buff *skb);
	220	extern int dccp_rcv_state_process(struct sock sk, struct sk_buff skb,
	221	struct dccp_hdr *dh, unsigned len);
	222	extern int dccp_rcv_established(struct sock sk, struct sk_buff skb,
	223	const struct dccp_hdr *dh, const unsigned len);
	224
3e0fadc5 ACM	225	extern int dccp_init_sock(struct sock *sk);
3e0fadc5 ACM	226	extern int dccp_destroy_sock(struct sock *sk);
f21e68ca	227
7c657876 ACM	228	extern void dccp_close(struct sock *sk, long timeout);
	229	extern struct sk_buff dccp_make_response(struct sock sk,
	230	struct dst_entry *dst,
	231	struct request_sock *req);
	232
	233	extern int dccp_connect(struct sock *sk);
	234	extern int dccp_disconnect(struct sock *sk, int flags);
c985ed70	235	extern void dccp_hash(struct sock *sk);
f21e68ca	236	extern void dccp_unhash(struct sock *sk);
7c657876	237	extern int dccp_getsockopt(struct sock *sk, int level, int optname,
a1d3a355 ACM	238	char __user optval, int __user optlen);
	239	extern int dccp_setsockopt(struct sock *sk, int level, int optname,
	240	char __user *optval, int optlen);
7c657876	241	extern int dccp_ioctl(struct sock *sk, int cmd, unsigned long arg);
7690af3f ACM	242	extern int dccp_sendmsg(struct kiocb iocb, struct sock sk,
7690af3f ACM	243	struct msghdr *msg, size_t size);
7c657876 ACM	244	extern int dccp_recvmsg(struct kiocb iocb, struct sock sk,
	245	struct msghdr *msg, size_t len, int nonblock,
	246	int flags, int *addr_len);
7c657876	247	extern void dccp_shutdown(struct sock *sk, int how);
f21e68ca ACM	248	extern int inet_dccp_listen(struct socket *sock, int backlog);
	249	extern unsigned int dccp_poll(struct file file, struct socket sock,
	250	poll_table *wait);
	251	extern void dccp_v4_send_check(struct sock *sk, int len,
	252	struct sk_buff *skb);
	253	extern int dccp_v4_connect(struct sock sk, struct sockaddr uaddr,
	254	int addr_len);
7c657876	255
95b81ef7	256	extern int dccp_v4_checksum(const struct sk_buff *skb,
60fe62e7	257	const __be32 saddr, const __be32 daddr);
7c657876	258
017487d7	259	extern int dccp_send_reset(struct sock *sk, enum dccp_reset_codes code);
7ad07e7c	260	extern void dccp_send_close(struct sock *sk, const int active);
f21e68ca ACM	261	extern int dccp_invalid_packet(struct sk_buff *skb);
	262
	263	static inline int dccp_bad_service_code(const struct sock *sk,
60fe62e7	264	const __be32 service)
f21e68ca ACM	265	{
	266	const struct dccp_sock *dp = dccp_sk(sk);
	267
	268	if (dp->dccps_service == service)
	269	return 0;
	270	return !dccp_list_has_service(dp->dccps_service_list, service);
	271	}
7c657876 ACM	272
7c657876 ACM	273	struct dccp_skb_cb {
67e6b629 ACM	274	__u8 dccpd_type:4;
	275	__u8 dccpd_ccval:4;
	276	__u8 dccpd_reset_code;
	277	__u16 dccpd_opt_len;
7c657876 ACM	278	__u64 dccpd_seq;
7c657876 ACM	279	__u64 dccpd_ack_seq;
7c657876 ACM	280	};
	281
	282	#define DCCP_SKB_CB(__skb) ((struct dccp_skb_cb *)&((__skb)->cb[0]))
	283
	284	static inline int dccp_non_data_packet(const struct sk_buff *skb)
	285	{
	286	const __u8 type = DCCP_SKB_CB(skb)->dccpd_type;
	287
	288	return type == DCCP_PKT_ACK \|\|
	289	type == DCCP_PKT_CLOSE \|\|
	290	type == DCCP_PKT_CLOSEREQ \|\|
	291	type == DCCP_PKT_RESET \|\|
	292	type == DCCP_PKT_SYNC \|\|
	293	type == DCCP_PKT_SYNCACK;
	294	}
	295
	296	static inline int dccp_packet_without_ack(const struct sk_buff *skb)
	297	{
	298	const __u8 type = DCCP_SKB_CB(skb)->dccpd_type;
	299
	300	return type == DCCP_PKT_DATA \|\| type == DCCP_PKT_REQUEST;
	301	}
	302
	303	#define DCCP_MAX_SEQNO ((((u64)1) << 48) - 1)
	304	#define DCCP_PKT_WITHOUT_ACK_SEQ (DCCP_MAX_SEQNO << 2)
	305
	306	static inline void dccp_set_seqno(u64 *seqno, u64 value)
	307	{
	308	if (value > DCCP_MAX_SEQNO)
	309	value -= DCCP_MAX_SEQNO + 1;
	310	*seqno = value;
	311	}
	312
	313	static inline u64 dccp_delta_seqno(u64 seqno1, u64 seqno2)
	314	{
	315	return ((seqno2 << 16) - (seqno1 << 16)) >> 16;
	316	}
	317
	318	static inline void dccp_inc_seqno(u64 *seqno)
	319	{
	320	if (++*seqno > DCCP_MAX_SEQNO)
	321	*seqno = 0;
	322	}
	323
	324	static inline void dccp_hdr_set_seq(struct dccp_hdr *dh, const u64 gss)
	325	{
7690af3f ACM	326	struct dccp_hdr_ext dhx = (struct dccp_hdr_ext )((void *)dh +
7690af3f ACM	327	sizeof(*dh));
60fe62e7 AB	328	dh->dccph_seq2 = 0;
60fe62e7 AB	329	dh->dccph_seq = htons((gss >> 32) & 0xfffff);
7c657876 ACM	330	dhx->dccph_seq_low = htonl(gss & 0xffffffff);
	331	}
	332
7690af3f ACM	333	static inline void dccp_hdr_set_ack(struct dccp_hdr_ack_bits *dhack,
7690af3f ACM	334	const u64 gsr)
7c657876	335	{
60fe62e7 AB	336	dhack->dccph_reserved1 = 0;
60fe62e7 AB	337	dhack->dccph_ack_nr_high = htons(gsr >> 32);
7c657876 ACM	338	dhack->dccph_ack_nr_low = htonl(gsr & 0xffffffff);
	339	}
	340
	341	static inline void dccp_update_gsr(struct sock *sk, u64 seq)
	342	{
	343	struct dccp_sock *dp = dccp_sk(sk);
7c657876	344
03ace394 ACM	345	dp->dccps_gsr = seq;
03ace394 ACM	346	dccp_set_seqno(&dp->dccps_swl,
7690af3f ACM	347	(dp->dccps_gsr + 1 -
7690af3f ACM	348	(dp->dccps_options.dccpo_sequence_window / 4)));
7c657876	349	dccp_set_seqno(&dp->dccps_swh,
7690af3f ACM	350	(dp->dccps_gsr +
7690af3f ACM	351	(3 * dp->dccps_options.dccpo_sequence_window) / 4));
7c657876 ACM	352	}
	353
	354	static inline void dccp_update_gss(struct sock *sk, u64 seq)
	355	{
	356	struct dccp_sock *dp = dccp_sk(sk);
7c657876	357
03ace394 ACM	358	dp->dccps_awh = dp->dccps_gss = seq;
03ace394 ACM	359	dccp_set_seqno(&dp->dccps_awl,
7690af3f ACM	360	(dp->dccps_gss -
7690af3f ACM	361	dp->dccps_options.dccpo_sequence_window + 1));
7c657876	362	}
ae31c339 ACM	363
	364	static inline int dccp_ack_pending(const struct sock *sk)
	365	{
	366	const struct dccp_sock *dp = dccp_sk(sk);
	367	return dp->dccps_timestamp_echo != 0 \|\|
	368	#ifdef CONFIG_IP_DCCP_ACKVEC
	369	(dp->dccps_options.dccpo_send_ack_vector &&
	370	dccp_ackvec_pending(dp->dccps_hc_rx_ackvec)) \|\|
	371	#endif
	372	inet_csk_ack_scheduled(sk);
	373	}
7c657876 ACM	374
	375	extern void dccp_insert_options(struct sock sk, struct sk_buff skb);
	376	extern void dccp_insert_option_elapsed_time(struct sock *sk,
	377	struct sk_buff *skb,
	378	u32 elapsed_time);
d4b81ff7 ACM	379	extern void dccp_insert_option_timestamp(struct sock *sk,
d4b81ff7 ACM	380	struct sk_buff *skb);
7c657876 ACM	381	extern void dccp_insert_option(struct sock sk, struct sk_buff skb,
	382	unsigned char option,
	383	const void *value, unsigned char len);
	384
	385	extern struct socket *dccp_ctl_socket;
	386
b0e56780 ACM	387	extern void dccp_timestamp(const struct sock sk, struct timeval tv);
b0e56780 ACM	388
b6ee3d4a ACM	389	static inline suseconds_t timeval_usecs(const struct timeval *tv)
	390	{
	391	return tv->tv_sec * USEC_PER_SEC + tv->tv_usec;
	392	}
	393
	394	static inline suseconds_t timeval_delta(const struct timeval *large,
	395	const struct timeval *small)
	396	{
	397	time_t secs = large->tv_sec - small->tv_sec;
	398	suseconds_t usecs = large->tv_usec - small->tv_usec;
	399
	400	if (usecs < 0) {
	401	secs--;
	402	usecs += USEC_PER_SEC;
	403	}
	404	return secs * USEC_PER_SEC + usecs;
	405	}
	406
	407	static inline void timeval_add_usecs(struct timeval *tv,
	408	const suseconds_t usecs)
	409	{
	410	tv->tv_usec += usecs;
	411	while (tv->tv_usec >= USEC_PER_SEC) {
	412	tv->tv_sec++;
	413	tv->tv_usec -= USEC_PER_SEC;
	414	}
	415	}
	416
	417	static inline void timeval_sub_usecs(struct timeval *tv,
	418	const suseconds_t usecs)
	419	{
	420	tv->tv_usec -= usecs;
	421	while (tv->tv_usec < 0) {
	422	tv->tv_sec--;
	423	tv->tv_usec += USEC_PER_SEC;
	424	}
	425	}
	426
e55d912f ACM	427	#ifdef CONFIG_SYSCTL
	428	extern int dccp_sysctl_init(void);
	429	extern void dccp_sysctl_exit(void);
	430	#else
	431	static inline int dccp_sysctl_init(void)
	432	{
	433	return 0;
	434	}
	435
	436	static inline void dccp_sysctl_exit(void)
	437	{
	438	}
	439	#endif
	440
7c657876	441	#endif /* _DCCP_H */