[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"

#define DCCP_CRIT(fmt, a...) LIMIT_NETDEBUG(KERN_CRIT fmt " at %s:%d/%s()\n",  \
 					 ##a, __FILE__, __LINE__, __FUNCTION__)
#define DCCP_BUG(fmt, a...)  do { DCCP_CRIT(fmt, ##a); dump_stack(); } while (0)
#define DCCP_BUG_ON(cond)    do { if (unlikely((cond) == 0))                   \
					DCCP_BUG("BUG: condition \"%s\" fails",\
						 __stringify((cond)));	       \
			     } while (0)

#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 */

#define DCCP_XMIT_TIMEO 30000 /* Time/msecs for blocking transmit per packet */

/* sysctl variables for DCCP */
extern int  sysctl_dccp_request_retries;
extern int  sysctl_dccp_retries1;
extern int  sysctl_dccp_retries2;
extern int  sysctl_dccp_feat_sequence_window;
extern int  sysctl_dccp_feat_rx_ccid;
extern int  sysctl_dccp_feat_tx_ccid;
extern int  sysctl_dccp_feat_ack_ratio;
extern int  sysctl_dccp_feat_send_ack_vector;
extern int  sysctl_dccp_feat_send_ndp_count;

/* 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)

/*
 * 	Checksumming routines
 */
static inline int dccp_csum_coverage(const struct sk_buff *skb)
{
	const struct dccp_hdr* dh = dccp_hdr(skb);

	if (dh->dccph_cscov == 0)
		return skb->len;
	return (dh->dccph_doff + dh->dccph_cscov - 1) * sizeof(u32);
}

static inline void dccp_csum_outgoing(struct sk_buff *skb)
{
	int cov = dccp_csum_coverage(skb);

	if (cov >= skb->len)
		dccp_hdr(skb)->dccph_cscov = 0;

	skb->csum = skb_checksum(skb, 0, (cov > skb->len)? skb->len : cov, 0);
}

extern void dccp_v4_send_check(struct sock *sk, int len, struct sk_buff *skb);

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);

extern void dccp_reqsk_init(struct request_sock *req, struct sk_buff *skb);

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 int	   dccp_v4_connect(struct sock *sk, struct sockaddr *uaddr,
				   int addr_len);

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
3c695262 GR	21	#define DCCP_CRIT(fmt, a...) LIMIT_NETDEBUG(KERN_CRIT fmt " at %s:%d/%s()\n", \
	22	##a, __FILE__, __LINE__, __FUNCTION__)
	23	#define DCCP_BUG(fmt, a...) do { DCCP_CRIT(fmt, ##a); dump_stack(); } while (0)
	24	#define DCCP_BUG_ON(cond) do { if (unlikely((cond) == 0)) \
	25	DCCP_BUG("BUG: condition \"%s\" fails",\
	26	__stringify((cond))); \
	27	} while (0)
	28
725ba8ee	29	#ifdef CONFIG_IP_DCCP_DEBUG
7c657876 ACM	30	extern int dccp_debug;
	31
	32	#define dccp_pr_debug(format, a...) \
	33	do { if (dccp_debug) \
	34	printk(KERN_DEBUG "%s: " format, __FUNCTION__ , ##a); \
	35	} while (0)
7690af3f ACM	36	#define dccp_pr_debug_cat(format, a...) do { if (dccp_debug) \
7690af3f ACM	37	printk(format, ##a); } while (0)
7c657876 ACM	38	#else
	39	#define dccp_pr_debug(format, a...)
	40	#define dccp_pr_debug_cat(format, a...)
	41	#endif
	42
	43	extern struct inet_hashinfo dccp_hashinfo;
	44
	45	extern atomic_t dccp_orphan_count;
7c657876 ACM	46
	47	extern void dccp_time_wait(struct sock *sk, int state, int timeo);
	48
60361be1 GR	49	/*
	50	* Set safe upper bounds for header and option length. Since Data Offset is 8
	51	* bits (RFC 4340, sec. 5.1), the total header length can never be more than
	52	* 4 * 255 = 1020 bytes. The largest possible header length is 28 bytes (X=1):
	53	* - DCCP-Response with ACK Subheader and 4 bytes of Service code OR
	54	* - DCCP-Reset with ACK Subheader and 4 bytes of Reset Code fields
	55	* Hence a safe upper bound for the maximum option length is 1020-28 = 992
	56	*/
	57	#define MAX_DCCP_SPECIFIC_HEADER (255 * sizeof(int))
	58	#define DCCP_MAX_PACKET_HDR 28
	59	#define DCCP_MAX_OPT_LEN (MAX_DCCP_SPECIFIC_HEADER - DCCP_MAX_PACKET_HDR)
	60	#define MAX_DCCP_HEADER (MAX_DCCP_SPECIFIC_HEADER + MAX_HEADER)
7c657876 ACM	61
	62	#define DCCP_TIMEWAIT_LEN (60 * HZ) /* how long to wait to destroy TIME-WAIT
	63	* state, about 60 seconds */
	64
0e64e94e	65	/* RFC 1122, 4.2.3.1 initial RTO value */
7c657876 ACM	66	#define DCCP_TIMEOUT_INIT ((unsigned)(3 * HZ))
	67
	68	/* Maximal interval between probes for local resources. */
	69	#define DCCP_RESOURCE_PROBE_INTERVAL ((unsigned)(HZ / 2U))
	70
	71	#define DCCP_RTO_MAX ((unsigned)(120 * HZ)) /* FIXME: using TCP value */
	72
f45b3ec4 IM	73	#define DCCP_XMIT_TIMEO 30000 /* Time/msecs for blocking transmit per packet */
f45b3ec4 IM	74
2e2e9e92 GR	75	/* sysctl variables for DCCP */
	76	extern int sysctl_dccp_request_retries;
	77	extern int sysctl_dccp_retries1;
	78	extern int sysctl_dccp_retries2;
afb0a34d GR	79	extern int sysctl_dccp_feat_sequence_window;
	80	extern int sysctl_dccp_feat_rx_ccid;
	81	extern int sysctl_dccp_feat_tx_ccid;
	82	extern int sysctl_dccp_feat_ack_ratio;
	83	extern int sysctl_dccp_feat_send_ack_vector;
	84	extern int sysctl_dccp_feat_send_ndp_count;
2e2e9e92	85
7c657876	86	/* is seq1 < seq2 ? */
a10cedd4	87	static inline int before48(const u64 seq1, const u64 seq2)
7c657876	88	{
a10cedd4	89	return (s64)((seq1 << 16) - (seq2 << 16)) < 0;
7c657876 ACM	90	}
	91
	92	/* is seq1 > seq2 ? */
a10cedd4	93	static inline int after48(const u64 seq1, const u64 seq2)
7c657876	94	{
a10cedd4	95	return (s64)((seq2 << 16) - (seq1 << 16)) < 0;
7c657876 ACM	96	}
	97
	98	/* is seq2 <= seq1 <= seq3 ? */
a10cedd4	99	static inline int between48(const u64 seq1, const u64 seq2, const u64 seq3)
7c657876 ACM	100	{
	101	return (seq3 << 16) - (seq2 << 16) >= (seq1 << 16) - (seq2 << 16);
	102	}
	103
	104	static inline u64 max48(const u64 seq1, const u64 seq2)
	105	{
	106	return after48(seq1, seq2) ? seq1 : seq2;
	107	}
	108
837d107c IM	109	/* is seq1 next seqno after seq2 */
	110	static inline int follows48(const u64 seq1, const u64 seq2)
	111	{
	112	int diff = (seq1 & 0xFFFF) - (seq2 & 0xFFFF);
	113
	114	return diff==1;
	115	}
	116
7c657876 ACM	117	enum {
	118	DCCP_MIB_NUM = 0,
	119	DCCP_MIB_ACTIVEOPENS, /* ActiveOpens */
	120	DCCP_MIB_ESTABRESETS, /* EstabResets */
	121	DCCP_MIB_CURRESTAB, /* CurrEstab */
	122	DCCP_MIB_OUTSEGS, /* OutSegs */
	123	DCCP_MIB_OUTRSTS,
	124	DCCP_MIB_ABORTONTIMEOUT,
	125	DCCP_MIB_TIMEOUTS,
	126	DCCP_MIB_ABORTFAILED,
	127	DCCP_MIB_PASSIVEOPENS,
	128	DCCP_MIB_ATTEMPTFAILS,
	129	DCCP_MIB_OUTDATAGRAMS,
	130	DCCP_MIB_INERRS,
	131	DCCP_MIB_OPTMANDATORYERROR,
	132	DCCP_MIB_INVALIDOPT,
	133	__DCCP_MIB_MAX
	134	};
	135
	136	#define DCCP_MIB_MAX __DCCP_MIB_MAX
	137	struct dccp_mib {
	138	unsigned long mibs[DCCP_MIB_MAX];
	139	} __SNMP_MIB_ALIGN__;
	140
	141	DECLARE_SNMP_STAT(struct dccp_mib, dccp_statistics);
7690af3f ACM	142	#define DCCP_INC_STATS(field) SNMP_INC_STATS(dccp_statistics, field)
	143	#define DCCP_INC_STATS_BH(field) SNMP_INC_STATS_BH(dccp_statistics, field)
	144	#define DCCP_INC_STATS_USER(field) SNMP_INC_STATS_USER(dccp_statistics, field)
	145	#define DCCP_DEC_STATS(field) SNMP_DEC_STATS(dccp_statistics, field)
	146	#define DCCP_ADD_STATS_BH(field, val) \
	147	SNMP_ADD_STATS_BH(dccp_statistics, field, val)
	148	#define DCCP_ADD_STATS_USER(field, val) \
	149	SNMP_ADD_STATS_USER(dccp_statistics, field, val)
7c657876	150
6f4e5fff GR	151	/*
	152	* Checksumming routines
	153	*/
	154	static inline int dccp_csum_coverage(const struct sk_buff *skb)
	155	{
	156	const struct dccp_hdr* dh = dccp_hdr(skb);
	157
	158	if (dh->dccph_cscov == 0)
	159	return skb->len;
	160	return (dh->dccph_doff + dh->dccph_cscov - 1) * sizeof(u32);
	161	}
	162
	163	static inline void dccp_csum_outgoing(struct sk_buff *skb)
	164	{
	165	int cov = dccp_csum_coverage(skb);
	166
	167	if (cov >= skb->len)
	168	dccp_hdr(skb)->dccph_cscov = 0;
	169
	170	skb->csum = skb_checksum(skb, 0, (cov > skb->len)? skb->len : cov, 0);
	171	}
	172
	173	extern void dccp_v4_send_check(struct sock sk, int len, struct sk_buff skb);
	174
7c657876 ACM	175	extern int dccp_retransmit_skb(struct sock sk, struct sk_buff skb);
7c657876 ACM	176
7c657876 ACM	177	extern void dccp_send_ack(struct sock *sk);
7c657876 ACM	178	extern void dccp_send_delayed_ack(struct sock *sk);
8a73cd09 GR	179	extern void dccp_reqsk_send_ack(struct sk_buff sk, struct request_sock rsk);
8a73cd09 GR	180
e92ae93a ACM	181	extern void dccp_send_sync(struct sock *sk, const u64 seq,
e92ae93a ACM	182	const enum dccp_pkt_type pkt_type);
7c657876	183
97e5848d	184	extern void dccp_write_xmit(struct sock *sk, int block);
c530cfb1	185	extern void dccp_write_space(struct sock *sk);
27258ee5	186
7c657876 ACM	187	extern void dccp_init_xmit_timers(struct sock *sk);
	188	static inline void dccp_clear_xmit_timers(struct sock *sk)
	189	{
	190	inet_csk_clear_xmit_timers(sk);
	191	}
	192
	193	extern unsigned int dccp_sync_mss(struct sock *sk, u32 pmtu);
	194
	195	extern const char *dccp_packet_name(const int type);
	196	extern const char *dccp_state_name(const int state);
	197
c25a18ba ACM	198	extern void dccp_set_state(struct sock *sk, const int state);
c25a18ba ACM	199	extern void dccp_done(struct sock *sk);
7c657876	200
cf557926	201	extern void dccp_reqsk_init(struct request_sock req, struct sk_buff skb);
7c657876	202
7c657876 ACM	203	extern int dccp_v4_conn_request(struct sock sk, struct sk_buff skb);
	204
	205	extern struct sock dccp_create_openreq_child(struct sock sk,
	206	const struct request_sock *req,
	207	const struct sk_buff *skb);
	208
	209	extern int dccp_v4_do_rcv(struct sock sk, struct sk_buff skb);
	210
7c657876 ACM	211	extern struct sock dccp_v4_request_recv_sock(struct sock sk,
	212	struct sk_buff *skb,
	213	struct request_sock *req,
	214	struct dst_entry *dst);
	215	extern struct sock dccp_check_req(struct sock sk, struct sk_buff *skb,
	216	struct request_sock *req,
	217	struct request_sock **prev);
	218
	219	extern int dccp_child_process(struct sock parent, struct sock child,
	220	struct sk_buff *skb);
	221	extern int dccp_rcv_state_process(struct sock sk, struct sk_buff skb,
	222	struct dccp_hdr *dh, unsigned len);
	223	extern int dccp_rcv_established(struct sock sk, struct sk_buff skb,
	224	const struct dccp_hdr *dh, const unsigned len);
	225
72478873	226	extern int dccp_init_sock(struct sock *sk, const __u8 ctl_sock_initialized);
3e0fadc5	227	extern int dccp_destroy_sock(struct sock *sk);
f21e68ca	228
7c657876 ACM	229	extern void dccp_close(struct sock *sk, long timeout);
	230	extern struct sk_buff dccp_make_response(struct sock sk,
	231	struct dst_entry *dst,
	232	struct request_sock *req);
	233
	234	extern int dccp_connect(struct sock *sk);
	235	extern int dccp_disconnect(struct sock *sk, int flags);
c985ed70	236	extern void dccp_hash(struct sock *sk);
f21e68ca	237	extern void dccp_unhash(struct sock *sk);
7c657876	238	extern int dccp_getsockopt(struct sock *sk, int level, int optname,
a1d3a355 ACM	239	char __user optval, int __user optlen);
	240	extern int dccp_setsockopt(struct sock *sk, int level, int optname,
	241	char __user *optval, int optlen);
3fdadf7d DM	242	#ifdef CONFIG_COMPAT
	243	extern int compat_dccp_getsockopt(struct sock *sk,
	244	int level, int optname,
	245	char __user optval, int __user optlen);
	246	extern int compat_dccp_setsockopt(struct sock *sk,
	247	int level, int optname,
	248	char __user *optval, int optlen);
	249	#endif
7c657876	250	extern int dccp_ioctl(struct sock *sk, int cmd, unsigned long arg);
7690af3f ACM	251	extern int dccp_sendmsg(struct kiocb iocb, struct sock sk,
7690af3f ACM	252	struct msghdr *msg, size_t size);
7c657876 ACM	253	extern int dccp_recvmsg(struct kiocb iocb, struct sock sk,
	254	struct msghdr *msg, size_t len, int nonblock,
	255	int flags, int *addr_len);
7c657876	256	extern void dccp_shutdown(struct sock *sk, int how);
f21e68ca ACM	257	extern int inet_dccp_listen(struct socket *sock, int backlog);
	258	extern unsigned int dccp_poll(struct file file, struct socket sock,
	259	poll_table *wait);
f21e68ca ACM	260	extern int dccp_v4_connect(struct sock sk, struct sockaddr uaddr,
f21e68ca ACM	261	int addr_len);
7c657876	262
017487d7	263	extern int dccp_send_reset(struct sock *sk, enum dccp_reset_codes code);
7ad07e7c	264	extern void dccp_send_close(struct sock *sk, const int active);
f21e68ca ACM	265	extern int dccp_invalid_packet(struct sk_buff *skb);
	266
	267	static inline int dccp_bad_service_code(const struct sock *sk,
60fe62e7	268	const __be32 service)
f21e68ca ACM	269	{
	270	const struct dccp_sock *dp = dccp_sk(sk);
	271
	272	if (dp->dccps_service == service)
	273	return 0;
	274	return !dccp_list_has_service(dp->dccps_service_list, service);
	275	}
7c657876 ACM	276
7c657876 ACM	277	struct dccp_skb_cb {
67e6b629 ACM	278	__u8 dccpd_type:4;
	279	__u8 dccpd_ccval:4;
	280	__u8 dccpd_reset_code;
	281	__u16 dccpd_opt_len;
7c657876 ACM	282	__u64 dccpd_seq;
7c657876 ACM	283	__u64 dccpd_ack_seq;
7c657876 ACM	284	};
	285
	286	#define DCCP_SKB_CB(__skb) ((struct dccp_skb_cb *)&((__skb)->cb[0]))
	287
	288	static inline int dccp_non_data_packet(const struct sk_buff *skb)
	289	{
	290	const __u8 type = DCCP_SKB_CB(skb)->dccpd_type;
	291
	292	return type == DCCP_PKT_ACK \|\|
	293	type == DCCP_PKT_CLOSE \|\|
	294	type == DCCP_PKT_CLOSEREQ \|\|
	295	type == DCCP_PKT_RESET \|\|
	296	type == DCCP_PKT_SYNC \|\|
	297	type == DCCP_PKT_SYNCACK;
	298	}
	299
	300	static inline int dccp_packet_without_ack(const struct sk_buff *skb)
	301	{
	302	const __u8 type = DCCP_SKB_CB(skb)->dccpd_type;
	303
	304	return type == DCCP_PKT_DATA \|\| type == DCCP_PKT_REQUEST;
	305	}
	306
	307	#define DCCP_MAX_SEQNO ((((u64)1) << 48) - 1)
	308	#define DCCP_PKT_WITHOUT_ACK_SEQ (DCCP_MAX_SEQNO << 2)
	309
	310	static inline void dccp_set_seqno(u64 *seqno, u64 value)
	311	{
	312	if (value > DCCP_MAX_SEQNO)
	313	value -= DCCP_MAX_SEQNO + 1;
	314	*seqno = value;
	315	}
	316
	317	static inline u64 dccp_delta_seqno(u64 seqno1, u64 seqno2)
	318	{
	319	return ((seqno2 << 16) - (seqno1 << 16)) >> 16;
	320	}
	321
	322	static inline void dccp_inc_seqno(u64 *seqno)
	323	{
	324	if (++*seqno > DCCP_MAX_SEQNO)
	325	*seqno = 0;
	326	}
	327
	328	static inline void dccp_hdr_set_seq(struct dccp_hdr *dh, const u64 gss)
	329	{
7690af3f ACM	330	struct dccp_hdr_ext dhx = (struct dccp_hdr_ext )((void *)dh +
7690af3f ACM	331	sizeof(*dh));
60fe62e7 AB	332	dh->dccph_seq2 = 0;
60fe62e7 AB	333	dh->dccph_seq = htons((gss >> 32) & 0xfffff);
7c657876 ACM	334	dhx->dccph_seq_low = htonl(gss & 0xffffffff);
	335	}
	336
7690af3f ACM	337	static inline void dccp_hdr_set_ack(struct dccp_hdr_ack_bits *dhack,
7690af3f ACM	338	const u64 gsr)
7c657876	339	{
60fe62e7 AB	340	dhack->dccph_reserved1 = 0;
60fe62e7 AB	341	dhack->dccph_ack_nr_high = htons(gsr >> 32);
7c657876 ACM	342	dhack->dccph_ack_nr_low = htonl(gsr & 0xffffffff);
	343	}
	344
	345	static inline void dccp_update_gsr(struct sock *sk, u64 seq)
	346	{
	347	struct dccp_sock *dp = dccp_sk(sk);
a4bf3902	348	const struct dccp_minisock *dmsk = dccp_msk(sk);
7c657876	349
03ace394 ACM	350	dp->dccps_gsr = seq;
03ace394 ACM	351	dccp_set_seqno(&dp->dccps_swl,
a4bf3902	352	dp->dccps_gsr + 1 - (dmsk->dccpms_sequence_window / 4));
7c657876	353	dccp_set_seqno(&dp->dccps_swh,
a4bf3902	354	dp->dccps_gsr + (3 * dmsk->dccpms_sequence_window) / 4);
7c657876 ACM	355	}
	356
	357	static inline void dccp_update_gss(struct sock *sk, u64 seq)
	358	{
	359	struct dccp_sock *dp = dccp_sk(sk);
7c657876	360
03ace394 ACM	361	dp->dccps_awh = dp->dccps_gss = seq;
03ace394 ACM	362	dccp_set_seqno(&dp->dccps_awl,
7690af3f	363	(dp->dccps_gss -
a4bf3902	364	dccp_msk(sk)->dccpms_sequence_window + 1));
7c657876	365	}
ae31c339 ACM	366
	367	static inline int dccp_ack_pending(const struct sock *sk)
	368	{
	369	const struct dccp_sock *dp = dccp_sk(sk);
	370	return dp->dccps_timestamp_echo != 0 \|\|
	371	#ifdef CONFIG_IP_DCCP_ACKVEC
a4bf3902	372	(dccp_msk(sk)->dccpms_send_ack_vector &&
ae31c339 ACM	373	dccp_ackvec_pending(dp->dccps_hc_rx_ackvec)) \|\|
	374	#endif
	375	inet_csk_ack_scheduled(sk);
	376	}
7c657876	377
2d0817d1 ACM	378	extern int dccp_insert_options(struct sock sk, struct sk_buff skb);
2d0817d1 ACM	379	extern int dccp_insert_option_elapsed_time(struct sock *sk,
7c657876 ACM	380	struct sk_buff *skb,
7c657876 ACM	381	u32 elapsed_time);
2d0817d1	382	extern int dccp_insert_option_timestamp(struct sock *sk,
d4b81ff7	383	struct sk_buff *skb);
2d0817d1	384	extern int dccp_insert_option(struct sock sk, struct sk_buff skb,
7c657876 ACM	385	unsigned char option,
	386	const void *value, unsigned char len);
	387
b0e56780 ACM	388	extern void dccp_timestamp(const struct sock sk, struct timeval tv);
b0e56780 ACM	389
b6ee3d4a ACM	390	static inline suseconds_t timeval_usecs(const struct timeval *tv)
	391	{
	392	return tv->tv_sec * USEC_PER_SEC + tv->tv_usec;
	393	}
	394
	395	static inline suseconds_t timeval_delta(const struct timeval *large,
	396	const struct timeval *small)
	397	{
	398	time_t secs = large->tv_sec - small->tv_sec;
	399	suseconds_t usecs = large->tv_usec - small->tv_usec;
	400
	401	if (usecs < 0) {
	402	secs--;
	403	usecs += USEC_PER_SEC;
	404	}
	405	return secs * USEC_PER_SEC + usecs;
	406	}
	407
	408	static inline void timeval_add_usecs(struct timeval *tv,
	409	const suseconds_t usecs)
	410	{
	411	tv->tv_usec += usecs;
	412	while (tv->tv_usec >= USEC_PER_SEC) {
	413	tv->tv_sec++;
	414	tv->tv_usec -= USEC_PER_SEC;
	415	}
	416	}
	417
	418	static inline void timeval_sub_usecs(struct timeval *tv,
	419	const suseconds_t usecs)
	420	{
	421	tv->tv_usec -= usecs;
	422	while (tv->tv_usec < 0) {
	423	tv->tv_sec--;
	424	tv->tv_usec += USEC_PER_SEC;
	425	}
	426	}
	427
e55d912f ACM	428	#ifdef CONFIG_SYSCTL
	429	extern int dccp_sysctl_init(void);
	430	extern void dccp_sysctl_exit(void);
	431	#else
	432	static inline int dccp_sysctl_init(void)
	433	{
	434	return 0;
	435	}
	436
	437	static inline void dccp_sysctl_exit(void)
	438	{
	439	}
	440	#endif
	441
7c657876	442	#endif /* _DCCP_H */