[deliverable/linux.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_reqsk_send_ack(struct sk_buff *sk, struct request_sock *rsk);

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);
8a73cd09 GR	134	extern void dccp_reqsk_send_ack(struct sk_buff sk, struct request_sock rsk);
8a73cd09 GR	135
e92ae93a ACM	136	extern void dccp_send_sync(struct sock *sk, const u64 seq,
e92ae93a ACM	137	const enum dccp_pkt_type pkt_type);
7c657876	138
97e5848d	139	extern void dccp_write_xmit(struct sock *sk, int block);
c530cfb1	140	extern void dccp_write_space(struct sock *sk);
27258ee5	141
7c657876 ACM	142	extern void dccp_init_xmit_timers(struct sock *sk);
	143	static inline void dccp_clear_xmit_timers(struct sock *sk)
	144	{
	145	inet_csk_clear_xmit_timers(sk);
	146	}
	147
	148	extern unsigned int dccp_sync_mss(struct sock *sk, u32 pmtu);
	149
	150	extern const char *dccp_packet_name(const int type);
	151	extern const char *dccp_state_name(const int state);
	152
c25a18ba ACM	153	extern void dccp_set_state(struct sock *sk, const int state);
c25a18ba ACM	154	extern void dccp_done(struct sock *sk);
7c657876 ACM	155
	156	static inline void dccp_openreq_init(struct request_sock *req,
	157	struct dccp_sock *dp,
	158	struct sk_buff *skb)
	159	{
	160	/*
	161	* FIXME: fill in the other req fields from the DCCP options
	162	* received
	163	*/
	164	inet_rsk(req)->rmt_port = dccp_hdr(skb)->dccph_sport;
	165	inet_rsk(req)->acked = 0;
	166	req->rcv_wnd = 0;
	167	}
	168
7c657876 ACM	169	extern int dccp_v4_conn_request(struct sock sk, struct sk_buff skb);
	170
	171	extern struct sock dccp_create_openreq_child(struct sock sk,
	172	const struct request_sock *req,
	173	const struct sk_buff *skb);
	174
	175	extern int dccp_v4_do_rcv(struct sock sk, struct sk_buff skb);
	176
7c657876 ACM	177	extern struct sock dccp_v4_request_recv_sock(struct sock sk,
	178	struct sk_buff *skb,
	179	struct request_sock *req,
	180	struct dst_entry *dst);
	181	extern struct sock dccp_check_req(struct sock sk, struct sk_buff *skb,
	182	struct request_sock *req,
	183	struct request_sock **prev);
	184
	185	extern int dccp_child_process(struct sock parent, struct sock child,
	186	struct sk_buff *skb);
	187	extern int dccp_rcv_state_process(struct sock sk, struct sk_buff skb,
	188	struct dccp_hdr *dh, unsigned len);
	189	extern int dccp_rcv_established(struct sock sk, struct sk_buff skb,
	190	const struct dccp_hdr *dh, const unsigned len);
	191
72478873	192	extern int dccp_init_sock(struct sock *sk, const __u8 ctl_sock_initialized);
3e0fadc5	193	extern int dccp_destroy_sock(struct sock *sk);
f21e68ca	194
7c657876 ACM	195	extern void dccp_close(struct sock *sk, long timeout);
	196	extern struct sk_buff dccp_make_response(struct sock sk,
	197	struct dst_entry *dst,
	198	struct request_sock *req);
	199
	200	extern int dccp_connect(struct sock *sk);
	201	extern int dccp_disconnect(struct sock *sk, int flags);
c985ed70	202	extern void dccp_hash(struct sock *sk);
f21e68ca	203	extern void dccp_unhash(struct sock *sk);
7c657876	204	extern int dccp_getsockopt(struct sock *sk, int level, int optname,
a1d3a355 ACM	205	char __user optval, int __user optlen);
	206	extern int dccp_setsockopt(struct sock *sk, int level, int optname,
	207	char __user *optval, int optlen);
3fdadf7d DM	208	#ifdef CONFIG_COMPAT
	209	extern int compat_dccp_getsockopt(struct sock *sk,
	210	int level, int optname,
	211	char __user optval, int __user optlen);
	212	extern int compat_dccp_setsockopt(struct sock *sk,
	213	int level, int optname,
	214	char __user *optval, int optlen);
	215	#endif
7c657876	216	extern int dccp_ioctl(struct sock *sk, int cmd, unsigned long arg);
7690af3f ACM	217	extern int dccp_sendmsg(struct kiocb iocb, struct sock sk,
7690af3f ACM	218	struct msghdr *msg, size_t size);
7c657876 ACM	219	extern int dccp_recvmsg(struct kiocb iocb, struct sock sk,
	220	struct msghdr *msg, size_t len, int nonblock,
	221	int flags, int *addr_len);
7c657876	222	extern void dccp_shutdown(struct sock *sk, int how);
f21e68ca ACM	223	extern int inet_dccp_listen(struct socket *sock, int backlog);
	224	extern unsigned int dccp_poll(struct file file, struct socket sock,
	225	poll_table *wait);
	226	extern void dccp_v4_send_check(struct sock *sk, int len,
	227	struct sk_buff *skb);
	228	extern int dccp_v4_connect(struct sock sk, struct sockaddr uaddr,
	229	int addr_len);
7c657876	230
95b81ef7	231	extern int dccp_v4_checksum(const struct sk_buff *skb,
60fe62e7	232	const __be32 saddr, const __be32 daddr);
7c657876	233
017487d7	234	extern int dccp_send_reset(struct sock *sk, enum dccp_reset_codes code);
7ad07e7c	235	extern void dccp_send_close(struct sock *sk, const int active);
f21e68ca ACM	236	extern int dccp_invalid_packet(struct sk_buff *skb);
	237
	238	static inline int dccp_bad_service_code(const struct sock *sk,
60fe62e7	239	const __be32 service)
f21e68ca ACM	240	{
	241	const struct dccp_sock *dp = dccp_sk(sk);
	242
	243	if (dp->dccps_service == service)
	244	return 0;
	245	return !dccp_list_has_service(dp->dccps_service_list, service);
	246	}
7c657876 ACM	247
7c657876 ACM	248	struct dccp_skb_cb {
67e6b629 ACM	249	__u8 dccpd_type:4;
	250	__u8 dccpd_ccval:4;
	251	__u8 dccpd_reset_code;
	252	__u16 dccpd_opt_len;
7c657876 ACM	253	__u64 dccpd_seq;
7c657876 ACM	254	__u64 dccpd_ack_seq;
7c657876 ACM	255	};
	256
	257	#define DCCP_SKB_CB(__skb) ((struct dccp_skb_cb *)&((__skb)->cb[0]))
	258
	259	static inline int dccp_non_data_packet(const struct sk_buff *skb)
	260	{
	261	const __u8 type = DCCP_SKB_CB(skb)->dccpd_type;
	262
	263	return type == DCCP_PKT_ACK \|\|
	264	type == DCCP_PKT_CLOSE \|\|
	265	type == DCCP_PKT_CLOSEREQ \|\|
	266	type == DCCP_PKT_RESET \|\|
	267	type == DCCP_PKT_SYNC \|\|
	268	type == DCCP_PKT_SYNCACK;
	269	}
	270
	271	static inline int dccp_packet_without_ack(const struct sk_buff *skb)
	272	{
	273	const __u8 type = DCCP_SKB_CB(skb)->dccpd_type;
	274
	275	return type == DCCP_PKT_DATA \|\| type == DCCP_PKT_REQUEST;
	276	}
	277
	278	#define DCCP_MAX_SEQNO ((((u64)1) << 48) - 1)
	279	#define DCCP_PKT_WITHOUT_ACK_SEQ (DCCP_MAX_SEQNO << 2)
	280
	281	static inline void dccp_set_seqno(u64 *seqno, u64 value)
	282	{
	283	if (value > DCCP_MAX_SEQNO)
	284	value -= DCCP_MAX_SEQNO + 1;
	285	*seqno = value;
	286	}
	287
	288	static inline u64 dccp_delta_seqno(u64 seqno1, u64 seqno2)
	289	{
	290	return ((seqno2 << 16) - (seqno1 << 16)) >> 16;
	291	}
	292
	293	static inline void dccp_inc_seqno(u64 *seqno)
	294	{
	295	if (++*seqno > DCCP_MAX_SEQNO)
	296	*seqno = 0;
	297	}
	298
	299	static inline void dccp_hdr_set_seq(struct dccp_hdr *dh, const u64 gss)
	300	{
7690af3f ACM	301	struct dccp_hdr_ext dhx = (struct dccp_hdr_ext )((void *)dh +
7690af3f ACM	302	sizeof(*dh));
60fe62e7 AB	303	dh->dccph_seq2 = 0;
60fe62e7 AB	304	dh->dccph_seq = htons((gss >> 32) & 0xfffff);
7c657876 ACM	305	dhx->dccph_seq_low = htonl(gss & 0xffffffff);
	306	}
	307
7690af3f ACM	308	static inline void dccp_hdr_set_ack(struct dccp_hdr_ack_bits *dhack,
7690af3f ACM	309	const u64 gsr)
7c657876	310	{
60fe62e7 AB	311	dhack->dccph_reserved1 = 0;
60fe62e7 AB	312	dhack->dccph_ack_nr_high = htons(gsr >> 32);
7c657876 ACM	313	dhack->dccph_ack_nr_low = htonl(gsr & 0xffffffff);
	314	}
	315
	316	static inline void dccp_update_gsr(struct sock *sk, u64 seq)
	317	{
	318	struct dccp_sock *dp = dccp_sk(sk);
a4bf3902	319	const struct dccp_minisock *dmsk = dccp_msk(sk);
7c657876	320
03ace394 ACM	321	dp->dccps_gsr = seq;
03ace394 ACM	322	dccp_set_seqno(&dp->dccps_swl,
a4bf3902	323	dp->dccps_gsr + 1 - (dmsk->dccpms_sequence_window / 4));
7c657876	324	dccp_set_seqno(&dp->dccps_swh,
a4bf3902	325	dp->dccps_gsr + (3 * dmsk->dccpms_sequence_window) / 4);
7c657876 ACM	326	}
	327
	328	static inline void dccp_update_gss(struct sock *sk, u64 seq)
	329	{
	330	struct dccp_sock *dp = dccp_sk(sk);
7c657876	331
03ace394 ACM	332	dp->dccps_awh = dp->dccps_gss = seq;
03ace394 ACM	333	dccp_set_seqno(&dp->dccps_awl,
7690af3f	334	(dp->dccps_gss -
a4bf3902	335	dccp_msk(sk)->dccpms_sequence_window + 1));
7c657876	336	}
ae31c339 ACM	337
	338	static inline int dccp_ack_pending(const struct sock *sk)
	339	{
	340	const struct dccp_sock *dp = dccp_sk(sk);
	341	return dp->dccps_timestamp_echo != 0 \|\|
	342	#ifdef CONFIG_IP_DCCP_ACKVEC
a4bf3902	343	(dccp_msk(sk)->dccpms_send_ack_vector &&
ae31c339 ACM	344	dccp_ackvec_pending(dp->dccps_hc_rx_ackvec)) \|\|
	345	#endif
	346	inet_csk_ack_scheduled(sk);
	347	}
7c657876	348
2d0817d1 ACM	349	extern int dccp_insert_options(struct sock sk, struct sk_buff skb);
2d0817d1 ACM	350	extern int dccp_insert_option_elapsed_time(struct sock *sk,
7c657876 ACM	351	struct sk_buff *skb,
7c657876 ACM	352	u32 elapsed_time);
2d0817d1	353	extern int dccp_insert_option_timestamp(struct sock *sk,
d4b81ff7	354	struct sk_buff *skb);
2d0817d1	355	extern int dccp_insert_option(struct sock sk, struct sk_buff skb,
7c657876 ACM	356	unsigned char option,
	357	const void *value, unsigned char len);
	358
b0e56780 ACM	359	extern void dccp_timestamp(const struct sock sk, struct timeval tv);
b0e56780 ACM	360
b6ee3d4a ACM	361	static inline suseconds_t timeval_usecs(const struct timeval *tv)
	362	{
	363	return tv->tv_sec * USEC_PER_SEC + tv->tv_usec;
	364	}
	365
	366	static inline suseconds_t timeval_delta(const struct timeval *large,
	367	const struct timeval *small)
	368	{
	369	time_t secs = large->tv_sec - small->tv_sec;
	370	suseconds_t usecs = large->tv_usec - small->tv_usec;
	371
	372	if (usecs < 0) {
	373	secs--;
	374	usecs += USEC_PER_SEC;
	375	}
	376	return secs * USEC_PER_SEC + usecs;
	377	}
	378
	379	static inline void timeval_add_usecs(struct timeval *tv,
	380	const suseconds_t usecs)
	381	{
	382	tv->tv_usec += usecs;
	383	while (tv->tv_usec >= USEC_PER_SEC) {
	384	tv->tv_sec++;
	385	tv->tv_usec -= USEC_PER_SEC;
	386	}
	387	}
	388
	389	static inline void timeval_sub_usecs(struct timeval *tv,
	390	const suseconds_t usecs)
	391	{
	392	tv->tv_usec -= usecs;
	393	while (tv->tv_usec < 0) {
	394	tv->tv_sec--;
	395	tv->tv_usec += USEC_PER_SEC;
	396	}
	397	}
	398
e55d912f ACM	399	#ifdef CONFIG_SYSCTL
	400	extern int dccp_sysctl_init(void);
	401	extern void dccp_sysctl_exit(void);
	402	#else
	403	static inline int dccp_sysctl_init(void)
	404	{
	405	return 0;
	406	}
	407
	408	static inline void dccp_sysctl_exit(void)
	409	{
	410	}
	411	#endif
	412
7c657876	413	#endif /* _DCCP_H */