[mirror_ubuntu-bionic-kernel.git] / include / linux / dccp.h

/* SPDX-License-Identifier: GPL-2.0 */
#ifndef _LINUX_DCCP_H
#define _LINUX_DCCP_H


#include <linux/in.h>
#include <linux/interrupt.h>
#include <linux/ktime.h>
#include <linux/list.h>
#include <linux/uio.h>
#include <linux/workqueue.h>

#include <net/inet_connection_sock.h>
#include <net/inet_sock.h>
#include <net/inet_timewait_sock.h>
#include <net/tcp_states.h>
#include <uapi/linux/dccp.h>

enum dccp_state {
	DCCP_OPEN	     = TCP_ESTABLISHED,
	DCCP_REQUESTING	     = TCP_SYN_SENT,
	DCCP_LISTEN	     = TCP_LISTEN,
	DCCP_RESPOND	     = TCP_SYN_RECV,
	/*
	 * States involved in closing a DCCP connection:
	 * 1) ACTIVE_CLOSEREQ is entered by a server sending a CloseReq.
	 *
	 * 2) CLOSING can have three different meanings (RFC 4340, 8.3):
	 *  a. Client has performed active-close, has sent a Close to the server
	 *     from state OPEN or PARTOPEN, and is waiting for the final Reset
	 *     (in this case, SOCK_DONE == 1).
	 *  b. Client is asked to perform passive-close, by receiving a CloseReq
	 *     in (PART)OPEN state. It sends a Close and waits for final Reset
	 *     (in this case, SOCK_DONE == 0).
	 *  c. Server performs an active-close as in (a), keeps TIMEWAIT state.
	 *
	 * 3) The following intermediate states are employed to give passively
	 *    closing nodes a chance to process their unread data:
	 *    - PASSIVE_CLOSE    (from OPEN => CLOSED) and
	 *    - PASSIVE_CLOSEREQ (from (PART)OPEN to CLOSING; case (b) above).
	 */
	DCCP_ACTIVE_CLOSEREQ = TCP_FIN_WAIT1,
	DCCP_PASSIVE_CLOSE   = TCP_CLOSE_WAIT,	/* any node receiving a Close */
	DCCP_CLOSING	     = TCP_CLOSING,
	DCCP_TIME_WAIT	     = TCP_TIME_WAIT,
	DCCP_CLOSED	     = TCP_CLOSE,
	DCCP_NEW_SYN_RECV    = TCP_NEW_SYN_RECV,
	DCCP_PARTOPEN	     = TCP_MAX_STATES,
	DCCP_PASSIVE_CLOSEREQ,			/* clients receiving CloseReq */
	DCCP_MAX_STATES
};

enum {
	DCCPF_OPEN	      = TCPF_ESTABLISHED,
	DCCPF_REQUESTING      = TCPF_SYN_SENT,
	DCCPF_LISTEN	      = TCPF_LISTEN,
	DCCPF_RESPOND	      = TCPF_SYN_RECV,
	DCCPF_ACTIVE_CLOSEREQ = TCPF_FIN_WAIT1,
	DCCPF_CLOSING	      = TCPF_CLOSING,
	DCCPF_TIME_WAIT	      = TCPF_TIME_WAIT,
	DCCPF_CLOSED	      = TCPF_CLOSE,
	DCCPF_NEW_SYN_RECV    = TCPF_NEW_SYN_RECV,
	DCCPF_PARTOPEN	      = (1 << DCCP_PARTOPEN),
};

static inline struct dccp_hdr *dccp_hdr(const struct sk_buff *skb)
{
	return (struct dccp_hdr *)skb_transport_header(skb);
}

static inline struct dccp_hdr *dccp_zeroed_hdr(struct sk_buff *skb, int headlen)
{
	skb_push(skb, headlen);
	skb_reset_transport_header(skb);
	return memset(skb_transport_header(skb), 0, headlen);
}

static inline struct dccp_hdr_ext *dccp_hdrx(const struct dccp_hdr *dh)
{
	return (struct dccp_hdr_ext *)((unsigned char *)dh + sizeof(*dh));
}

static inline unsigned int __dccp_basic_hdr_len(const struct dccp_hdr *dh)
{
	return sizeof(*dh) + (dh->dccph_x ? sizeof(struct dccp_hdr_ext) : 0);
}

static inline unsigned int dccp_basic_hdr_len(const struct sk_buff *skb)
{
	const struct dccp_hdr *dh = dccp_hdr(skb);
	return __dccp_basic_hdr_len(dh);
}

static inline __u64 dccp_hdr_seq(const struct dccp_hdr *dh)
{
	__u64 seq_nr =  ntohs(dh->dccph_seq);

	if (dh->dccph_x != 0)
		seq_nr = (seq_nr << 32) + ntohl(dccp_hdrx(dh)->dccph_seq_low);
	else
		seq_nr += (u32)dh->dccph_seq2 << 16;

	return seq_nr;
}

static inline struct dccp_hdr_request *dccp_hdr_request(struct sk_buff *skb)
{
	return (struct dccp_hdr_request *)(skb_transport_header(skb) +
					   dccp_basic_hdr_len(skb));
}

static inline struct dccp_hdr_ack_bits *dccp_hdr_ack_bits(const struct sk_buff *skb)
{
	return (struct dccp_hdr_ack_bits *)(skb_transport_header(skb) +
					    dccp_basic_hdr_len(skb));
}

static inline u64 dccp_hdr_ack_seq(const struct sk_buff *skb)
{
	const struct dccp_hdr_ack_bits *dhack = dccp_hdr_ack_bits(skb);
	return ((u64)ntohs(dhack->dccph_ack_nr_high) << 32) + ntohl(dhack->dccph_ack_nr_low);
}

static inline struct dccp_hdr_response *dccp_hdr_response(struct sk_buff *skb)
{
	return (struct dccp_hdr_response *)(skb_transport_header(skb) +
					    dccp_basic_hdr_len(skb));
}

static inline struct dccp_hdr_reset *dccp_hdr_reset(struct sk_buff *skb)
{
	return (struct dccp_hdr_reset *)(skb_transport_header(skb) +
					 dccp_basic_hdr_len(skb));
}

static inline unsigned int __dccp_hdr_len(const struct dccp_hdr *dh)
{
	return __dccp_basic_hdr_len(dh) +
	       dccp_packet_hdr_len(dh->dccph_type);
}

static inline unsigned int dccp_hdr_len(const struct sk_buff *skb)
{
	return __dccp_hdr_len(dccp_hdr(skb));
}

/**
 * struct dccp_request_sock  -  represent DCCP-specific connection request
 * @dreq_inet_rsk: structure inherited from
 * @dreq_iss: initial sequence number, sent on the first Response (RFC 4340, 7.1)
 * @dreq_gss: greatest sequence number sent (for retransmitted Responses)
 * @dreq_isr: initial sequence number received in the first Request
 * @dreq_gsr: greatest sequence number received (for retransmitted Request(s))
 * @dreq_service: service code present on the Request (there is just one)
 * @dreq_featneg: feature negotiation options for this connection
 * The following two fields are analogous to the ones in dccp_sock:
 * @dreq_timestamp_echo: last received timestamp to echo (13.1)
 * @dreq_timestamp_echo: the time of receiving the last @dreq_timestamp_echo
 */
struct dccp_request_sock {
	struct inet_request_sock dreq_inet_rsk;
	__u64			 dreq_iss;
	__u64			 dreq_gss;
	__u64			 dreq_isr;
	__u64			 dreq_gsr;
	__be32			 dreq_service;
	spinlock_t		 dreq_lock;
	struct list_head	 dreq_featneg;
	__u32			 dreq_timestamp_echo;
	__u32			 dreq_timestamp_time;
};

static inline struct dccp_request_sock *dccp_rsk(const struct request_sock *req)
{
	return (struct dccp_request_sock *)req;
}

extern struct inet_timewait_death_row dccp_death_row;

extern int dccp_parse_options(struct sock *sk, struct dccp_request_sock *dreq,
			      struct sk_buff *skb);

struct dccp_options_received {
	u64	dccpor_ndp:48;
	u32	dccpor_timestamp;
	u32	dccpor_timestamp_echo;
	u32	dccpor_elapsed_time;
};

struct ccid;

enum dccp_role {
	DCCP_ROLE_UNDEFINED,
	DCCP_ROLE_LISTEN,
	DCCP_ROLE_CLIENT,
	DCCP_ROLE_SERVER,
};

struct dccp_service_list {
	__u32	dccpsl_nr;
	__be32	dccpsl_list[0];
};

#define DCCP_SERVICE_INVALID_VALUE htonl((__u32)-1)
#define DCCP_SERVICE_CODE_IS_ABSENT		0

static inline bool dccp_list_has_service(const struct dccp_service_list *sl,
					const __be32 service)
{
	if (likely(sl != NULL)) {
		u32 i = sl->dccpsl_nr;
		while (i--)
			if (sl->dccpsl_list[i] == service)
				return true;
	}
	return false;
}

struct dccp_ackvec;

/**
 * struct dccp_sock - DCCP socket state
 *
 * @dccps_swl - sequence number window low
 * @dccps_swh - sequence number window high
 * @dccps_awl - acknowledgement number window low
 * @dccps_awh - acknowledgement number window high
 * @dccps_iss - initial sequence number sent
 * @dccps_isr - initial sequence number received
 * @dccps_osr - first OPEN sequence number received
 * @dccps_gss - greatest sequence number sent
 * @dccps_gsr - greatest valid sequence number received
 * @dccps_gar - greatest valid ack number received on a non-Sync; initialized to %dccps_iss
 * @dccps_service - first (passive sock) or unique (active sock) service code
 * @dccps_service_list - second .. last service code on passive socket
 * @dccps_timestamp_echo - latest timestamp received on a TIMESTAMP option
 * @dccps_timestamp_time - time of receiving latest @dccps_timestamp_echo
 * @dccps_l_ack_ratio - feature-local Ack Ratio
 * @dccps_r_ack_ratio - feature-remote Ack Ratio
 * @dccps_l_seq_win - local Sequence Window (influences ack number validity)
 * @dccps_r_seq_win - remote Sequence Window (influences seq number validity)
 * @dccps_pcslen - sender   partial checksum coverage (via sockopt)
 * @dccps_pcrlen - receiver partial checksum coverage (via sockopt)
 * @dccps_send_ndp_count - local Send NDP Count feature (7.7.2)
 * @dccps_ndp_count - number of Non Data Packets since last data packet
 * @dccps_mss_cache - current value of MSS (path MTU minus header sizes)
 * @dccps_rate_last - timestamp for rate-limiting DCCP-Sync (RFC 4340, 7.5.4)
 * @dccps_featneg - tracks feature-negotiation state (mostly during handshake)
 * @dccps_hc_rx_ackvec - rx half connection ack vector
 * @dccps_hc_rx_ccid - CCID used for the receiver (or receiving half-connection)
 * @dccps_hc_tx_ccid - CCID used for the sender (or sending half-connection)
 * @dccps_options_received - parsed set of retrieved options
 * @dccps_qpolicy - TX dequeueing policy, one of %dccp_packet_dequeueing_policy
 * @dccps_tx_qlen - maximum length of the TX queue
 * @dccps_role - role of this sock, one of %dccp_role
 * @dccps_hc_rx_insert_options - receiver wants to add options when acking
 * @dccps_hc_tx_insert_options - sender wants to add options when sending
 * @dccps_server_timewait - server holds timewait state on close (RFC 4340, 8.3)
 * @dccps_sync_scheduled - flag which signals "send out-of-band message soon"
 * @dccps_xmitlet - tasklet scheduled by the TX CCID to dequeue data packets
 * @dccps_xmit_timer - used by the TX CCID to delay sending (rate-based pacing)
 * @dccps_syn_rtt - RTT sample from Request/Response exchange (in usecs)
 */
struct dccp_sock {
	/* inet_connection_sock has to be the first member of dccp_sock */
	struct inet_connection_sock	dccps_inet_connection;
#define dccps_syn_rtt			dccps_inet_connection.icsk_ack.lrcvtime
	__u64				dccps_swl;
	__u64				dccps_swh;
	__u64				dccps_awl;
	__u64				dccps_awh;
	__u64				dccps_iss;
	__u64				dccps_isr;
	__u64				dccps_osr;
	__u64				dccps_gss;
	__u64				dccps_gsr;
	__u64				dccps_gar;
	__be32				dccps_service;
	__u32				dccps_mss_cache;
	struct dccp_service_list	*dccps_service_list;
	__u32				dccps_timestamp_echo;
	__u32				dccps_timestamp_time;
	__u16				dccps_l_ack_ratio;
	__u16				dccps_r_ack_ratio;
	__u64				dccps_l_seq_win:48;
	__u64				dccps_r_seq_win:48;
	__u8				dccps_pcslen:4;
	__u8				dccps_pcrlen:4;
	__u8				dccps_send_ndp_count:1;
	__u64				dccps_ndp_count:48;
	unsigned long			dccps_rate_last;
	struct list_head		dccps_featneg;
	struct dccp_ackvec		*dccps_hc_rx_ackvec;
	struct ccid			*dccps_hc_rx_ccid;
	struct ccid			*dccps_hc_tx_ccid;
	struct dccp_options_received	dccps_options_received;
	__u8				dccps_qpolicy;
	__u32				dccps_tx_qlen;
	enum dccp_role			dccps_role:2;
	__u8				dccps_hc_rx_insert_options:1;
	__u8				dccps_hc_tx_insert_options:1;
	__u8				dccps_server_timewait:1;
	__u8				dccps_sync_scheduled:1;
	struct tasklet_struct		dccps_xmitlet;
	struct timer_list		dccps_xmit_timer;
};

static inline struct dccp_sock *dccp_sk(const struct sock *sk)
{
	return (struct dccp_sock *)sk;
}

static inline const char *dccp_role(const struct sock *sk)
{
	switch (dccp_sk(sk)->dccps_role) {
	case DCCP_ROLE_UNDEFINED: return "undefined";
	case DCCP_ROLE_LISTEN:	  return "listen";
	case DCCP_ROLE_SERVER:	  return "server";
	case DCCP_ROLE_CLIENT:	  return "client";
	}
	return NULL;
}

extern void dccp_syn_ack_timeout(const struct request_sock *req);

#endif /* _LINUX_DCCP_H */
Commit	Line	Data
b2441318	1	/* SPDX-License-Identifier: GPL-2.0 */
7c657876 ACM	2	#ifndef _LINUX_DCCP_H
	3	#define _LINUX_DCCP_H
	4
5a47a470 HW	5
5a47a470 HW	6	#include <linux/in.h>
a6b7a407	7	#include <linux/interrupt.h>
19ac2146	8	#include <linux/ktime.h>
5a47a470 HW	9	#include <linux/list.h>
	10	#include <linux/uio.h>
	11	#include <linux/workqueue.h>
	12
	13	#include <net/inet_connection_sock.h>
14c85021	14	#include <net/inet_sock.h>
64cf1e5d	15	#include <net/inet_timewait_sock.h>
5a47a470	16	#include <net/tcp_states.h>
607ca46e	17	#include <uapi/linux/dccp.h>
5a47a470 HW	18
5a47a470 HW	19	enum dccp_state {
f11135a3 GR	20	DCCP_OPEN = TCP_ESTABLISHED,
	21	DCCP_REQUESTING = TCP_SYN_SENT,
	22	DCCP_LISTEN = TCP_LISTEN,
	23	DCCP_RESPOND = TCP_SYN_RECV,
	24	/*
	25	* States involved in closing a DCCP connection:
	26	* 1) ACTIVE_CLOSEREQ is entered by a server sending a CloseReq.
	27	*
	28	* 2) CLOSING can have three different meanings (RFC 4340, 8.3):
	29	* a. Client has performed active-close, has sent a Close to the server
	30	* from state OPEN or PARTOPEN, and is waiting for the final Reset
	31	* (in this case, SOCK_DONE == 1).
	32	* b. Client is asked to perform passive-close, by receiving a CloseReq
	33	* in (PART)OPEN state. It sends a Close and waits for final Reset
	34	* (in this case, SOCK_DONE == 0).
	35	* c. Server performs an active-close as in (a), keeps TIMEWAIT state.
	36	*
	37	* 3) The following intermediate states are employed to give passively
	38	* closing nodes a chance to process their unread data:
	39	* - PASSIVE_CLOSE (from OPEN => CLOSED) and
	40	* - PASSIVE_CLOSEREQ (from (PART)OPEN to CLOSING; case (b) above).
	41	*/
	42	DCCP_ACTIVE_CLOSEREQ = TCP_FIN_WAIT1,
	43	DCCP_PASSIVE_CLOSE = TCP_CLOSE_WAIT, /* any node receiving a Close */
	44	DCCP_CLOSING = TCP_CLOSING,
	45	DCCP_TIME_WAIT = TCP_TIME_WAIT,
	46	DCCP_CLOSED = TCP_CLOSE,
85645bab	47	DCCP_NEW_SYN_RECV = TCP_NEW_SYN_RECV,
f11135a3 GR	48	DCCP_PARTOPEN = TCP_MAX_STATES,
f11135a3 GR	49	DCCP_PASSIVE_CLOSEREQ, /* clients receiving CloseReq */
9b91ad27	50	DCCP_MAX_STATES
5a47a470 HW	51	};
5a47a470 HW	52
5a47a470	53	enum {
f11135a3 GR	54	DCCPF_OPEN = TCPF_ESTABLISHED,
	55	DCCPF_REQUESTING = TCPF_SYN_SENT,
	56	DCCPF_LISTEN = TCPF_LISTEN,
	57	DCCPF_RESPOND = TCPF_SYN_RECV,
	58	DCCPF_ACTIVE_CLOSEREQ = TCPF_FIN_WAIT1,
	59	DCCPF_CLOSING = TCPF_CLOSING,
	60	DCCPF_TIME_WAIT = TCPF_TIME_WAIT,
	61	DCCPF_CLOSED = TCPF_CLOSE,
85645bab	62	DCCPF_NEW_SYN_RECV = TCPF_NEW_SYN_RECV,
f11135a3	63	DCCPF_PARTOPEN = (1 << DCCP_PARTOPEN),
5a47a470 HW	64	};
	65
	66	static inline struct dccp_hdr dccp_hdr(const struct sk_buff skb)
	67	{
9c70220b	68	return (struct dccp_hdr *)skb_transport_header(skb);
5a47a470 HW	69	}
5a47a470 HW	70
9b42078e GR	71	static inline struct dccp_hdr dccp_zeroed_hdr(struct sk_buff skb, int headlen)
9b42078e GR	72	{
badff6d0 ACM	73	skb_push(skb, headlen);
badff6d0 ACM	74	skb_reset_transport_header(skb);
9c70220b	75	return memset(skb_transport_header(skb), 0, headlen);
9b42078e GR	76	}
9b42078e GR	77
fde20105	78	static inline struct dccp_hdr_ext dccp_hdrx(const struct dccp_hdr dh)
5a47a470	79	{
fde20105	80	return (struct dccp_hdr_ext )((unsigned char )dh + sizeof(*dh));
5a47a470 HW	81	}
5a47a470 HW	82
1d3de414 HW	83	static inline unsigned int __dccp_basic_hdr_len(const struct dccp_hdr *dh)
	84	{
	85	return sizeof(*dh) + (dh->dccph_x ? sizeof(struct dccp_hdr_ext) : 0);
	86	}
	87
5a47a470 HW	88	static inline unsigned int dccp_basic_hdr_len(const struct sk_buff *skb)
	89	{
	90	const struct dccp_hdr *dh = dccp_hdr(skb);
1d3de414	91	return __dccp_basic_hdr_len(dh);
5a47a470 HW	92	}
5a47a470 HW	93
fde20105	94	static inline __u64 dccp_hdr_seq(const struct dccp_hdr *dh)
5a47a470	95	{
60fe62e7	96	__u64 seq_nr = ntohs(dh->dccph_seq);
5a47a470 HW	97
5a47a470 HW	98	if (dh->dccph_x != 0)
fde20105	99	seq_nr = (seq_nr << 32) + ntohl(dccp_hdrx(dh)->dccph_seq_low);
60fe62e7 AB	100	else
60fe62e7 AB	101	seq_nr += (u32)dh->dccph_seq2 << 16;
5a47a470 HW	102
	103	return seq_nr;
	104	}
	105
	106	static inline struct dccp_hdr_request dccp_hdr_request(struct sk_buff skb)
	107	{
9c70220b ACM	108	return (struct dccp_hdr_request *)(skb_transport_header(skb) +
9c70220b ACM	109	dccp_basic_hdr_len(skb));
5a47a470 HW	110	}
	111
	112	static inline struct dccp_hdr_ack_bits dccp_hdr_ack_bits(const struct sk_buff skb)
	113	{
9c70220b ACM	114	return (struct dccp_hdr_ack_bits *)(skb_transport_header(skb) +
9c70220b ACM	115	dccp_basic_hdr_len(skb));
5a47a470 HW	116	}
	117
	118	static inline u64 dccp_hdr_ack_seq(const struct sk_buff *skb)
	119	{
	120	const struct dccp_hdr_ack_bits *dhack = dccp_hdr_ack_bits(skb);
60fe62e7	121	return ((u64)ntohs(dhack->dccph_ack_nr_high) << 32) + ntohl(dhack->dccph_ack_nr_low);
5a47a470 HW	122	}
	123
	124	static inline struct dccp_hdr_response dccp_hdr_response(struct sk_buff skb)
	125	{
9c70220b ACM	126	return (struct dccp_hdr_response *)(skb_transport_header(skb) +
9c70220b ACM	127	dccp_basic_hdr_len(skb));
5a47a470 HW	128	}
	129
	130	static inline struct dccp_hdr_reset dccp_hdr_reset(struct sk_buff skb)
	131	{
9c70220b ACM	132	return (struct dccp_hdr_reset *)(skb_transport_header(skb) +
9c70220b ACM	133	dccp_basic_hdr_len(skb));
5a47a470 HW	134	}
5a47a470 HW	135
1d3de414 HW	136	static inline unsigned int __dccp_hdr_len(const struct dccp_hdr *dh)
	137	{
	138	return __dccp_basic_hdr_len(dh) +
	139	dccp_packet_hdr_len(dh->dccph_type);
	140	}
	141
5a47a470 HW	142	static inline unsigned int dccp_hdr_len(const struct sk_buff *skb)
5a47a470 HW	143	{
1d3de414	144	return __dccp_hdr_len(dccp_hdr(skb));
5a47a470 HW	145	}
5a47a470 HW	146
b4d4f7c7 GR	147	/**
	148	* struct dccp_request_sock - represent DCCP-specific connection request
	149	* @dreq_inet_rsk: structure inherited from
f541fb7e SJ	150	* @dreq_iss: initial sequence number, sent on the first Response (RFC 4340, 7.1)
	151	* @dreq_gss: greatest sequence number sent (for retransmitted Responses)
	152	* @dreq_isr: initial sequence number received in the first Request
	153	* @dreq_gsr: greatest sequence number received (for retransmitted Request(s))
b4d4f7c7	154	* @dreq_service: service code present on the Request (there is just one)
ac75773c	155	* @dreq_featneg: feature negotiation options for this connection
b4d4f7c7 GR	156	* The following two fields are analogous to the ones in dccp_sock:
	157	* @dreq_timestamp_echo: last received timestamp to echo (13.1)
	158	* @dreq_timestamp_echo: the time of receiving the last @dreq_timestamp_echo
	159	*/
7c657876 ACM	160	struct dccp_request_sock {
	161	struct inet_request_sock dreq_inet_rsk;
	162	__u64 dreq_iss;
f541fb7e	163	__u64 dreq_gss;
7c657876	164	__u64 dreq_isr;
f541fb7e	165	__u64 dreq_gsr;
60fe62e7	166	__be32 dreq_service;
62f8f4d9	167	spinlock_t dreq_lock;
ac75773c	168	struct list_head dreq_featneg;
b4d4f7c7 GR	169	__u32 dreq_timestamp_echo;
b4d4f7c7 GR	170	__u32 dreq_timestamp_time;
7c657876 ACM	171	};
	172
	173	static inline struct dccp_request_sock dccp_rsk(const struct request_sock req)
	174	{
	175	return (struct dccp_request_sock *)req;
	176	}
	177
64cf1e5d ACM	178	extern struct inet_timewait_death_row dccp_death_row;
64cf1e5d ACM	179
8b819412 GR	180	extern int dccp_parse_options(struct sock sk, struct dccp_request_sock dreq,
	181	struct sk_buff *skb);
	182
7c657876	183	struct dccp_options_received {
5b5d0e70	184	u64 dccpor_ndp:48;
7c657876 ACM	185	u32 dccpor_timestamp;
	186	u32 dccpor_timestamp_echo;
	187	u32 dccpor_elapsed_time;
	188	};
	189
	190	struct ccid;
	191
	192	enum dccp_role {
	193	DCCP_ROLE_UNDEFINED,
	194	DCCP_ROLE_LISTEN,
	195	DCCP_ROLE_CLIENT,
	196	DCCP_ROLE_SERVER,
	197	};
	198
67e6b629 ACM	199	struct dccp_service_list {
67e6b629 ACM	200	__u32 dccpsl_nr;
60fe62e7	201	__be32 dccpsl_list[0];
67e6b629 ACM	202	};
	203
	204	#define DCCP_SERVICE_INVALID_VALUE htonl((__u32)-1)
8109b02b	205	#define DCCP_SERVICE_CODE_IS_ABSENT 0
67e6b629	206
0c6119d9	207	static inline bool dccp_list_has_service(const struct dccp_service_list *sl,
60fe62e7	208	const __be32 service)
67e6b629 ACM	209	{
	210	if (likely(sl != NULL)) {
	211	u32 i = sl->dccpsl_nr;
	212	while (i--)
	213	if (sl->dccpsl_list[i] == service)
0c6119d9	214	return true;
67e6b629	215	}
0c6119d9	216	return false;
67e6b629 ACM	217	}
67e6b629 ACM	218
ae31c339 ACM	219	struct dccp_ackvec;
ae31c339 ACM	220
7c657876 ACM	221	/**
	222	* struct dccp_sock - DCCP socket state
	223	*
	224	* @dccps_swl - sequence number window low
	225	* @dccps_swh - sequence number window high
	226	* @dccps_awl - acknowledgement number window low
	227	* @dccps_awh - acknowledgement number window high
	228	* @dccps_iss - initial sequence number sent
	229	* @dccps_isr - initial sequence number received
	230	* @dccps_osr - first OPEN sequence number received
	231	* @dccps_gss - greatest sequence number sent
	232	* @dccps_gsr - greatest valid sequence number received
	233	* @dccps_gar - greatest valid ack number received on a non-Sync; initialized to %dccps_iss
09dbc389 GR	234	* @dccps_service - first (passive sock) or unique (active sock) service code
09dbc389 GR	235	* @dccps_service_list - second .. last service code on passive socket
7c657876	236	* @dccps_timestamp_echo - latest timestamp received on a TIMESTAMP option
b4d4f7c7	237	* @dccps_timestamp_time - time of receiving latest @dccps_timestamp_echo
91d73c15 GR	238	* @dccps_l_ack_ratio - feature-local Ack Ratio
91d73c15 GR	239	* @dccps_r_ack_ratio - feature-remote Ack Ratio
792b4878 GR	240	* @dccps_l_seq_win - local Sequence Window (influences ack number validity)
792b4878 GR	241	* @dccps_r_seq_win - remote Sequence Window (influences seq number validity)
6f4e5fff GR	242	* @dccps_pcslen - sender partial checksum coverage (via sockopt)
6f4e5fff GR	243	* @dccps_pcrlen - receiver partial checksum coverage (via sockopt)
4098dce5	244	* @dccps_send_ndp_count - local Send NDP Count feature (7.7.2)
7c657876	245	* @dccps_ndp_count - number of Non Data Packets since last data packet
91d73c15	246	* @dccps_mss_cache - current value of MSS (path MTU minus header sizes)
a94f0f97	247	* @dccps_rate_last - timestamp for rate-limiting DCCP-Sync (RFC 4340, 7.5.4)
ac75773c	248	* @dccps_featneg - tracks feature-negotiation state (mostly during handshake)
ae31c339	249	* @dccps_hc_rx_ackvec - rx half connection ack vector
91d73c15 GR	250	* @dccps_hc_rx_ccid - CCID used for the receiver (or receiving half-connection)
	251	* @dccps_hc_tx_ccid - CCID used for the sender (or sending half-connection)
	252	* @dccps_options_received - parsed set of retrieved options
871a2c16 TG	253	* @dccps_qpolicy - TX dequeueing policy, one of %dccp_packet_dequeueing_policy
871a2c16 TG	254	* @dccps_tx_qlen - maximum length of the TX queue
91d73c15 GR	255	* @dccps_role - role of this sock, one of %dccp_role
	256	* @dccps_hc_rx_insert_options - receiver wants to add options when acking
	257	* @dccps_hc_tx_insert_options - sender wants to add options when sending
b8599d20	258	* @dccps_server_timewait - server holds timewait state on close (RFC 4340, 8.3)
d83447f0	259	* @dccps_sync_scheduled - flag which signals "send out-of-band message soon"
dc841e30 GR	260	* @dccps_xmitlet - tasklet scheduled by the TX CCID to dequeue data packets
dc841e30 GR	261	* @dccps_xmit_timer - used by the TX CCID to delay sending (rate-based pacing)
89560b53	262	* @dccps_syn_rtt - RTT sample from Request/Response exchange (in usecs)
7c657876 ACM	263	*/
	264	struct dccp_sock {
	265	/* inet_connection_sock has to be the first member of dccp_sock */
	266	struct inet_connection_sock dccps_inet_connection;
89560b53	267	#define dccps_syn_rtt dccps_inet_connection.icsk_ack.lrcvtime
7c657876 ACM	268	__u64 dccps_swl;
	269	__u64 dccps_swh;
	270	__u64 dccps_awl;
	271	__u64 dccps_awh;
	272	__u64 dccps_iss;
	273	__u64 dccps_isr;
	274	__u64 dccps_osr;
	275	__u64 dccps_gss;
	276	__u64 dccps_gsr;
	277	__u64 dccps_gar;
60fe62e7	278	__be32 dccps_service;
cf6b5fbe	279	__u32 dccps_mss_cache;
67e6b629	280	struct dccp_service_list *dccps_service_list;
7c657876	281	__u32 dccps_timestamp_echo;
b4d4f7c7	282	__u32 dccps_timestamp_time;
2a91aa39 AB	283	__u16 dccps_l_ack_ratio;
2a91aa39 AB	284	__u16 dccps_r_ack_ratio;
792b4878 GR	285	__u64 dccps_l_seq_win:48;
792b4878 GR	286	__u64 dccps_r_seq_win:48;
29450559 GR	287	__u8 dccps_pcslen:4;
29450559 GR	288	__u8 dccps_pcrlen:4;
4098dce5	289	__u8 dccps_send_ndp_count:1;
5b5d0e70	290	__u64 dccps_ndp_count:48;
a94f0f97	291	unsigned long dccps_rate_last;
ac75773c	292	struct list_head dccps_featneg;
ae31c339	293	struct dccp_ackvec *dccps_hc_rx_ackvec;
7c657876 ACM	294	struct ccid *dccps_hc_rx_ccid;
	295	struct ccid *dccps_hc_tx_ccid;
	296	struct dccp_options_received dccps_options_received;
871a2c16 TG	297	__u8 dccps_qpolicy;
871a2c16 TG	298	__u32 dccps_tx_qlen;
7c657876	299	enum dccp_role dccps_role:2;
507d37cf ACM	300	__u8 dccps_hc_rx_insert_options:1;
507d37cf ACM	301	__u8 dccps_hc_tx_insert_options:1;
b8599d20	302	__u8 dccps_server_timewait:1;
d83447f0	303	__u8 dccps_sync_scheduled:1;
dc841e30	304	struct tasklet_struct dccps_xmitlet;
97e5848d	305	struct timer_list dccps_xmit_timer;
7c657876	306	};
8109b02b	307
7c657876 ACM	308	static inline struct dccp_sock dccp_sk(const struct sock sk)
	309	{
	310	return (struct dccp_sock *)sk;
	311	}
	312
	313	static inline const char dccp_role(const struct sock sk)
	314	{
	315	switch (dccp_sk(sk)->dccps_role) {
	316	case DCCP_ROLE_UNDEFINED: return "undefined";
	317	case DCCP_ROLE_LISTEN: return "listen";
	318	case DCCP_ROLE_SERVER: return "server";
	319	case DCCP_ROLE_CLIENT: return "client";
	320	}
	321	return NULL;
	322	}
	323
42cb80a2	324	extern void dccp_syn_ack_timeout(const struct request_sock *req);
c72e1183	325
7c657876	326	#endif /* _LINUX_DCCP_H */