[mirror_ubuntu-bionic-kernel.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 void dccp_time_wait(struct sock *sk, int state, int timeo);

/*
 *  Set safe upper bounds for header and option length. Since Data Offset is 8
 *  bits (RFC 4340, sec. 5.1), the total header length can never be more than
 *  4 * 255 = 1020 bytes. The largest possible header length is 28 bytes (X=1):
 *    - DCCP-Response with ACK Subheader and 4 bytes of Service code      OR
 *    - DCCP-Reset    with ACK Subheader and 4 bytes of Reset Code fields
 *  Hence a safe upper bound for the maximum option length is 1020-28 = 992
 */
#define MAX_DCCP_SPECIFIC_HEADER (255 * sizeof(int))
#define DCCP_MAX_PACKET_HDR 28
#define DCCP_MAX_OPT_LEN (MAX_DCCP_SPECIFIC_HEADER - DCCP_MAX_PACKET_HDR)
#define MAX_DCCP_HEADER (MAX_DCCP_SPECIFIC_HEADER + MAX_HEADER)

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

/* RFC 1122, 4.2.3.1 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;
}

/* is seq1 next seqno after seq2 */
static inline int follows48(const u64 seq1, const u64 seq2)
{
	int diff = (seq1 & 0xFFFF) - (seq2 & 0xFFFF);

	return diff==1;
}

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 void dccp_write_xmit(struct sock *sk, int block);
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;
7c657876 ACM	38
	39	extern void dccp_time_wait(struct sock *sk, int state, int timeo);
	40
60361be1 GR	41	/*
	42	* Set safe upper bounds for header and option length. Since Data Offset is 8
	43	* bits (RFC 4340, sec. 5.1), the total header length can never be more than
	44	* 4 * 255 = 1020 bytes. The largest possible header length is 28 bytes (X=1):
	45	* - DCCP-Response with ACK Subheader and 4 bytes of Service code OR
	46	* - DCCP-Reset with ACK Subheader and 4 bytes of Reset Code fields
	47	* Hence a safe upper bound for the maximum option length is 1020-28 = 992
	48	*/
	49	#define MAX_DCCP_SPECIFIC_HEADER (255 * sizeof(int))
	50	#define DCCP_MAX_PACKET_HDR 28
	51	#define DCCP_MAX_OPT_LEN (MAX_DCCP_SPECIFIC_HEADER - DCCP_MAX_PACKET_HDR)
	52	#define MAX_DCCP_HEADER (MAX_DCCP_SPECIFIC_HEADER + MAX_HEADER)
7c657876 ACM	53
	54	#define DCCP_TIMEWAIT_LEN (60 * HZ) /* how long to wait to destroy TIME-WAIT
	55	* state, about 60 seconds */
	56
0e64e94e	57	/* RFC 1122, 4.2.3.1 initial RTO value */
7c657876 ACM	58	#define DCCP_TIMEOUT_INIT ((unsigned)(3 * HZ))
	59
	60	/* Maximal interval between probes for local resources. */
	61	#define DCCP_RESOURCE_PROBE_INTERVAL ((unsigned)(HZ / 2U))
	62
	63	#define DCCP_RTO_MAX ((unsigned)(120 * HZ)) /* FIXME: using TCP value */
	64
7c657876	65	/* is seq1 < seq2 ? */
a10cedd4	66	static inline int before48(const u64 seq1, const u64 seq2)
7c657876	67	{
a10cedd4	68	return (s64)((seq1 << 16) - (seq2 << 16)) < 0;
7c657876 ACM	69	}
	70
	71	/* is seq1 > seq2 ? */
a10cedd4	72	static inline int after48(const u64 seq1, const u64 seq2)
7c657876	73	{
a10cedd4	74	return (s64)((seq2 << 16) - (seq1 << 16)) < 0;
7c657876 ACM	75	}
	76
	77	/* is seq2 <= seq1 <= seq3 ? */
a10cedd4	78	static inline int between48(const u64 seq1, const u64 seq2, const u64 seq3)
7c657876 ACM	79	{
	80	return (seq3 << 16) - (seq2 << 16) >= (seq1 << 16) - (seq2 << 16);
	81	}
	82
	83	static inline u64 max48(const u64 seq1, const u64 seq2)
	84	{
	85	return after48(seq1, seq2) ? seq1 : seq2;
	86	}
	87
837d107c IM	88	/* is seq1 next seqno after seq2 */
	89	static inline int follows48(const u64 seq1, const u64 seq2)
	90	{
	91	int diff = (seq1 & 0xFFFF) - (seq2 & 0xFFFF);
	92
	93	return diff==1;
	94	}
	95
7c657876 ACM	96	enum {
	97	DCCP_MIB_NUM = 0,
	98	DCCP_MIB_ACTIVEOPENS, /* ActiveOpens */
	99	DCCP_MIB_ESTABRESETS, /* EstabResets */
	100	DCCP_MIB_CURRESTAB, /* CurrEstab */
	101	DCCP_MIB_OUTSEGS, /* OutSegs */
	102	DCCP_MIB_OUTRSTS,
	103	DCCP_MIB_ABORTONTIMEOUT,
	104	DCCP_MIB_TIMEOUTS,
	105	DCCP_MIB_ABORTFAILED,
	106	DCCP_MIB_PASSIVEOPENS,
	107	DCCP_MIB_ATTEMPTFAILS,
	108	DCCP_MIB_OUTDATAGRAMS,
	109	DCCP_MIB_INERRS,
	110	DCCP_MIB_OPTMANDATORYERROR,
	111	DCCP_MIB_INVALIDOPT,
	112	__DCCP_MIB_MAX
	113	};
	114
	115	#define DCCP_MIB_MAX __DCCP_MIB_MAX
	116	struct dccp_mib {
	117	unsigned long mibs[DCCP_MIB_MAX];
	118	} __SNMP_MIB_ALIGN__;
	119
	120	DECLARE_SNMP_STAT(struct dccp_mib, dccp_statistics);
7690af3f ACM	121	#define DCCP_INC_STATS(field) SNMP_INC_STATS(dccp_statistics, field)
	122	#define DCCP_INC_STATS_BH(field) SNMP_INC_STATS_BH(dccp_statistics, field)
	123	#define DCCP_INC_STATS_USER(field) SNMP_INC_STATS_USER(dccp_statistics, field)
	124	#define DCCP_DEC_STATS(field) SNMP_DEC_STATS(dccp_statistics, field)
	125	#define DCCP_ADD_STATS_BH(field, val) \
	126	SNMP_ADD_STATS_BH(dccp_statistics, field, val)
	127	#define DCCP_ADD_STATS_USER(field, val) \
	128	SNMP_ADD_STATS_USER(dccp_statistics, field, val)
7c657876	129
7c657876 ACM	130	extern int dccp_retransmit_skb(struct sock sk, struct sk_buff skb);
7c657876 ACM	131
7c657876 ACM	132	extern void dccp_send_ack(struct sock *sk);
7c657876 ACM	133	extern void dccp_send_delayed_ack(struct sock *sk);
e92ae93a ACM	134	extern void dccp_send_sync(struct sock *sk, const u64 seq,
e92ae93a ACM	135	const enum dccp_pkt_type pkt_type);
7c657876	136
97e5848d	137	extern void dccp_write_xmit(struct sock *sk, int block);
c530cfb1	138	extern void dccp_write_space(struct sock *sk);
27258ee5	139
7c657876 ACM	140	extern void dccp_init_xmit_timers(struct sock *sk);
	141	static inline void dccp_clear_xmit_timers(struct sock *sk)
	142	{
	143	inet_csk_clear_xmit_timers(sk);
	144	}
	145
	146	extern unsigned int dccp_sync_mss(struct sock *sk, u32 pmtu);
	147
	148	extern const char *dccp_packet_name(const int type);
	149	extern const char *dccp_state_name(const int state);
	150
c25a18ba ACM	151	extern void dccp_set_state(struct sock *sk, const int state);
c25a18ba ACM	152	extern void dccp_done(struct sock *sk);
7c657876 ACM	153
	154	static inline void dccp_openreq_init(struct request_sock *req,
	155	struct dccp_sock *dp,
	156	struct sk_buff *skb)
	157	{
	158	/*
	159	* FIXME: fill in the other req fields from the DCCP options
	160	* received
	161	*/
	162	inet_rsk(req)->rmt_port = dccp_hdr(skb)->dccph_sport;
	163	inet_rsk(req)->acked = 0;
	164	req->rcv_wnd = 0;
	165	}
	166
7c657876 ACM	167	extern int dccp_v4_conn_request(struct sock sk, struct sk_buff skb);
	168
	169	extern struct sock dccp_create_openreq_child(struct sock sk,
	170	const struct request_sock *req,
	171	const struct sk_buff *skb);
	172
	173	extern int dccp_v4_do_rcv(struct sock sk, struct sk_buff skb);
	174
7c657876 ACM	175	extern struct sock dccp_v4_request_recv_sock(struct sock sk,
	176	struct sk_buff *skb,
	177	struct request_sock *req,
	178	struct dst_entry *dst);
	179	extern struct sock dccp_check_req(struct sock sk, struct sk_buff *skb,
	180	struct request_sock *req,
	181	struct request_sock **prev);
	182
	183	extern int dccp_child_process(struct sock parent, struct sock child,
	184	struct sk_buff *skb);
	185	extern int dccp_rcv_state_process(struct sock sk, struct sk_buff skb,
	186	struct dccp_hdr *dh, unsigned len);
	187	extern int dccp_rcv_established(struct sock sk, struct sk_buff skb,
	188	const struct dccp_hdr *dh, const unsigned len);
	189
72478873	190	extern int dccp_init_sock(struct sock *sk, const __u8 ctl_sock_initialized);
3e0fadc5	191	extern int dccp_destroy_sock(struct sock *sk);
f21e68ca	192
7c657876 ACM	193	extern void dccp_close(struct sock *sk, long timeout);
	194	extern struct sk_buff dccp_make_response(struct sock sk,
	195	struct dst_entry *dst,
	196	struct request_sock *req);
	197
	198	extern int dccp_connect(struct sock *sk);
	199	extern int dccp_disconnect(struct sock *sk, int flags);
c985ed70	200	extern void dccp_hash(struct sock *sk);
f21e68ca	201	extern void dccp_unhash(struct sock *sk);
7c657876	202	extern int dccp_getsockopt(struct sock *sk, int level, int optname,
a1d3a355 ACM	203	char __user optval, int __user optlen);
	204	extern int dccp_setsockopt(struct sock *sk, int level, int optname,
	205	char __user *optval, int optlen);
3fdadf7d DM	206	#ifdef CONFIG_COMPAT
	207	extern int compat_dccp_getsockopt(struct sock *sk,
	208	int level, int optname,
	209	char __user optval, int __user optlen);
	210	extern int compat_dccp_setsockopt(struct sock *sk,
	211	int level, int optname,
	212	char __user *optval, int optlen);
	213	#endif
7c657876	214	extern int dccp_ioctl(struct sock *sk, int cmd, unsigned long arg);
7690af3f ACM	215	extern int dccp_sendmsg(struct kiocb iocb, struct sock sk,
7690af3f ACM	216	struct msghdr *msg, size_t size);
7c657876 ACM	217	extern int dccp_recvmsg(struct kiocb iocb, struct sock sk,
	218	struct msghdr *msg, size_t len, int nonblock,
	219	int flags, int *addr_len);
7c657876	220	extern void dccp_shutdown(struct sock *sk, int how);
f21e68ca ACM	221	extern int inet_dccp_listen(struct socket *sock, int backlog);
	222	extern unsigned int dccp_poll(struct file file, struct socket sock,
	223	poll_table *wait);
	224	extern void dccp_v4_send_check(struct sock *sk, int len,
	225	struct sk_buff *skb);
	226	extern int dccp_v4_connect(struct sock sk, struct sockaddr uaddr,
	227	int addr_len);
7c657876	228
95b81ef7	229	extern int dccp_v4_checksum(const struct sk_buff *skb,
60fe62e7	230	const __be32 saddr, const __be32 daddr);
7c657876	231
017487d7	232	extern int dccp_send_reset(struct sock *sk, enum dccp_reset_codes code);
7ad07e7c	233	extern void dccp_send_close(struct sock *sk, const int active);
f21e68ca ACM	234	extern int dccp_invalid_packet(struct sk_buff *skb);
	235
	236	static inline int dccp_bad_service_code(const struct sock *sk,
60fe62e7	237	const __be32 service)
f21e68ca ACM	238	{
	239	const struct dccp_sock *dp = dccp_sk(sk);
	240
	241	if (dp->dccps_service == service)
	242	return 0;
	243	return !dccp_list_has_service(dp->dccps_service_list, service);
	244	}
7c657876 ACM	245
7c657876 ACM	246	struct dccp_skb_cb {
67e6b629 ACM	247	__u8 dccpd_type:4;
	248	__u8 dccpd_ccval:4;
	249	__u8 dccpd_reset_code;
	250	__u16 dccpd_opt_len;
7c657876 ACM	251	__u64 dccpd_seq;
7c657876 ACM	252	__u64 dccpd_ack_seq;
7c657876 ACM	253	};
	254
	255	#define DCCP_SKB_CB(__skb) ((struct dccp_skb_cb *)&((__skb)->cb[0]))
	256
	257	static inline int dccp_non_data_packet(const struct sk_buff *skb)
	258	{
	259	const __u8 type = DCCP_SKB_CB(skb)->dccpd_type;
	260
	261	return type == DCCP_PKT_ACK \|\|
	262	type == DCCP_PKT_CLOSE \|\|
	263	type == DCCP_PKT_CLOSEREQ \|\|
	264	type == DCCP_PKT_RESET \|\|
	265	type == DCCP_PKT_SYNC \|\|
	266	type == DCCP_PKT_SYNCACK;
	267	}
	268
	269	static inline int dccp_packet_without_ack(const struct sk_buff *skb)
	270	{
	271	const __u8 type = DCCP_SKB_CB(skb)->dccpd_type;
	272
	273	return type == DCCP_PKT_DATA \|\| type == DCCP_PKT_REQUEST;
	274	}
	275
	276	#define DCCP_MAX_SEQNO ((((u64)1) << 48) - 1)
	277	#define DCCP_PKT_WITHOUT_ACK_SEQ (DCCP_MAX_SEQNO << 2)
	278
	279	static inline void dccp_set_seqno(u64 *seqno, u64 value)
	280	{
	281	if (value > DCCP_MAX_SEQNO)
	282	value -= DCCP_MAX_SEQNO + 1;
	283	*seqno = value;
	284	}
	285
	286	static inline u64 dccp_delta_seqno(u64 seqno1, u64 seqno2)
	287	{
	288	return ((seqno2 << 16) - (seqno1 << 16)) >> 16;
	289	}
	290
	291	static inline void dccp_inc_seqno(u64 *seqno)
	292	{
	293	if (++*seqno > DCCP_MAX_SEQNO)
	294	*seqno = 0;
	295	}
	296
	297	static inline void dccp_hdr_set_seq(struct dccp_hdr *dh, const u64 gss)
	298	{
7690af3f ACM	299	struct dccp_hdr_ext dhx = (struct dccp_hdr_ext )((void *)dh +
7690af3f ACM	300	sizeof(*dh));
60fe62e7 AB	301	dh->dccph_seq2 = 0;
60fe62e7 AB	302	dh->dccph_seq = htons((gss >> 32) & 0xfffff);
7c657876 ACM	303	dhx->dccph_seq_low = htonl(gss & 0xffffffff);
	304	}
	305
7690af3f ACM	306	static inline void dccp_hdr_set_ack(struct dccp_hdr_ack_bits *dhack,
7690af3f ACM	307	const u64 gsr)
7c657876	308	{
60fe62e7 AB	309	dhack->dccph_reserved1 = 0;
60fe62e7 AB	310	dhack->dccph_ack_nr_high = htons(gsr >> 32);
7c657876 ACM	311	dhack->dccph_ack_nr_low = htonl(gsr & 0xffffffff);
	312	}
	313
	314	static inline void dccp_update_gsr(struct sock *sk, u64 seq)
	315	{
	316	struct dccp_sock *dp = dccp_sk(sk);
a4bf3902	317	const struct dccp_minisock *dmsk = dccp_msk(sk);
7c657876	318
03ace394 ACM	319	dp->dccps_gsr = seq;
03ace394 ACM	320	dccp_set_seqno(&dp->dccps_swl,
a4bf3902	321	dp->dccps_gsr + 1 - (dmsk->dccpms_sequence_window / 4));
7c657876	322	dccp_set_seqno(&dp->dccps_swh,
a4bf3902	323	dp->dccps_gsr + (3 * dmsk->dccpms_sequence_window) / 4);
7c657876 ACM	324	}
	325
	326	static inline void dccp_update_gss(struct sock *sk, u64 seq)
	327	{
	328	struct dccp_sock *dp = dccp_sk(sk);
7c657876	329
03ace394 ACM	330	dp->dccps_awh = dp->dccps_gss = seq;
03ace394 ACM	331	dccp_set_seqno(&dp->dccps_awl,
7690af3f	332	(dp->dccps_gss -
a4bf3902	333	dccp_msk(sk)->dccpms_sequence_window + 1));
7c657876	334	}
ae31c339 ACM	335
	336	static inline int dccp_ack_pending(const struct sock *sk)
	337	{
	338	const struct dccp_sock *dp = dccp_sk(sk);
	339	return dp->dccps_timestamp_echo != 0 \|\|
	340	#ifdef CONFIG_IP_DCCP_ACKVEC
a4bf3902	341	(dccp_msk(sk)->dccpms_send_ack_vector &&
ae31c339 ACM	342	dccp_ackvec_pending(dp->dccps_hc_rx_ackvec)) \|\|
	343	#endif
	344	inet_csk_ack_scheduled(sk);
	345	}
7c657876	346
2d0817d1 ACM	347	extern int dccp_insert_options(struct sock sk, struct sk_buff skb);
2d0817d1 ACM	348	extern int dccp_insert_option_elapsed_time(struct sock *sk,
7c657876 ACM	349	struct sk_buff *skb,
7c657876 ACM	350	u32 elapsed_time);
2d0817d1	351	extern int dccp_insert_option_timestamp(struct sock *sk,
d4b81ff7	352	struct sk_buff *skb);
2d0817d1	353	extern int dccp_insert_option(struct sock sk, struct sk_buff skb,
7c657876 ACM	354	unsigned char option,
	355	const void *value, unsigned char len);
	356
b0e56780 ACM	357	extern void dccp_timestamp(const struct sock sk, struct timeval tv);
b0e56780 ACM	358
b6ee3d4a ACM	359	static inline suseconds_t timeval_usecs(const struct timeval *tv)
	360	{
	361	return tv->tv_sec * USEC_PER_SEC + tv->tv_usec;
	362	}
	363
	364	static inline suseconds_t timeval_delta(const struct timeval *large,
	365	const struct timeval *small)
	366	{
	367	time_t secs = large->tv_sec - small->tv_sec;
	368	suseconds_t usecs = large->tv_usec - small->tv_usec;
	369
	370	if (usecs < 0) {
	371	secs--;
	372	usecs += USEC_PER_SEC;
	373	}
	374	return secs * USEC_PER_SEC + usecs;
	375	}
	376
	377	static inline void timeval_add_usecs(struct timeval *tv,
	378	const suseconds_t usecs)
	379	{
	380	tv->tv_usec += usecs;
	381	while (tv->tv_usec >= USEC_PER_SEC) {
	382	tv->tv_sec++;
	383	tv->tv_usec -= USEC_PER_SEC;
	384	}
	385	}
	386
	387	static inline void timeval_sub_usecs(struct timeval *tv,
	388	const suseconds_t usecs)
	389	{
	390	tv->tv_usec -= usecs;
	391	while (tv->tv_usec < 0) {
	392	tv->tv_sec--;
	393	tv->tv_usec += USEC_PER_SEC;
	394	}
	395	}
	396
e55d912f ACM	397	#ifdef CONFIG_SYSCTL
	398	extern int dccp_sysctl_init(void);
	399	extern void dccp_sysctl_exit(void);
	400	#else
	401	static inline int dccp_sysctl_init(void)
	402	{
	403	return 0;
	404	}
	405
	406	static inline void dccp_sysctl_exit(void)
	407	{
	408	}
	409	#endif
	410
7c657876	411	#endif /* _DCCP_H */