[linux-2.6-block.git] / include / net / inet_connection_sock.h

/*
 * NET		Generic infrastructure for INET connection oriented protocols.
 *
 *		Definitions for inet_connection_sock 
 *
 * Authors:	Many people, see the TCP sources
 *
 * 		From code originally in TCP
 *
 *		This program is free software; you can redistribute it and/or
 *		modify it under the terms of the GNU General Public License
 *		as published by the Free Software Foundation; either version
 *		2 of the License, or (at your option) any later version.
 */
#ifndef _INET_CONNECTION_SOCK_H
#define _INET_CONNECTION_SOCK_H

#include <linux/compiler.h>
#include <linux/string.h>
#include <linux/timer.h>
#include <linux/poll.h>
#include <linux/kernel.h>

#include <net/inet_sock.h>
#include <net/request_sock.h>

/* Cancel timers, when they are not required. */
#undef INET_CSK_CLEAR_TIMERS

struct inet_bind_bucket;
struct tcp_congestion_ops;

/*
 * Pointers to address related TCP functions
 * (i.e. things that depend on the address family)
 */
struct inet_connection_sock_af_ops {
	int	    (*queue_xmit)(struct sock *sk, struct sk_buff *skb, struct flowi *fl);
	void	    (*send_check)(struct sock *sk, struct sk_buff *skb);
	int	    (*rebuild_header)(struct sock *sk);
	void	    (*sk_rx_dst_set)(struct sock *sk, const struct sk_buff *skb);
	int	    (*conn_request)(struct sock *sk, struct sk_buff *skb);
	struct sock *(*syn_recv_sock)(const struct sock *sk, struct sk_buff *skb,
				      struct request_sock *req,
				      struct dst_entry *dst,
				      struct request_sock *req_unhash,
				      bool *own_req);
	u16	    net_header_len;
	u16	    net_frag_header_len;
	u16	    sockaddr_len;
	int	    (*setsockopt)(struct sock *sk, int level, int optname,
				  char __user *optval, unsigned int optlen);
	int	    (*getsockopt)(struct sock *sk, int level, int optname,
				  char __user *optval, int __user *optlen);
#ifdef CONFIG_COMPAT
	int	    (*compat_setsockopt)(struct sock *sk,
				int level, int optname,
				char __user *optval, unsigned int optlen);
	int	    (*compat_getsockopt)(struct sock *sk,
				int level, int optname,
				char __user *optval, int __user *optlen);
#endif
	void	    (*addr2sockaddr)(struct sock *sk, struct sockaddr *);
	void	    (*mtu_reduced)(struct sock *sk);
};

/** inet_connection_sock - INET connection oriented sock
 *
 * @icsk_accept_queue:	   FIFO of established children
 * @icsk_bind_hash:	   Bind node
 * @icsk_timeout:	   Timeout
 * @icsk_retransmit_timer: Resend (no ack)
 * @icsk_rto:		   Retransmit timeout
 * @icsk_pmtu_cookie	   Last pmtu seen by socket
 * @icsk_ca_ops		   Pluggable congestion control hook
 * @icsk_af_ops		   Operations which are AF_INET{4,6} specific
 * @icsk_ulp_ops	   Pluggable ULP control hook
 * @icsk_ulp_data	   ULP private data
 * @icsk_clean_acked	   Clean acked data hook
 * @icsk_listen_portaddr_node	hash to the portaddr listener hashtable
 * @icsk_ca_state:	   Congestion control state
 * @icsk_retransmits:	   Number of unrecovered [RTO] timeouts
 * @icsk_pending:	   Scheduled timer event
 * @icsk_backoff:	   Backoff
 * @icsk_syn_retries:      Number of allowed SYN (or equivalent) retries
 * @icsk_probes_out:	   unanswered 0 window probes
 * @icsk_ext_hdr_len:	   Network protocol overhead (IP/IPv6 options)
 * @icsk_ack:		   Delayed ACK control data
 * @icsk_mtup;		   MTU probing control data
 */
struct inet_connection_sock {
	/* inet_sock has to be the first member! */
	struct inet_sock	  icsk_inet;
	struct request_sock_queue icsk_accept_queue;
	struct inet_bind_bucket	  *icsk_bind_hash;
	unsigned long		  icsk_timeout;
 	struct timer_list	  icsk_retransmit_timer;
 	struct timer_list	  icsk_delack_timer;
	__u32			  icsk_rto;
	__u32			  icsk_pmtu_cookie;
	const struct tcp_congestion_ops *icsk_ca_ops;
	const struct inet_connection_sock_af_ops *icsk_af_ops;
	const struct tcp_ulp_ops  *icsk_ulp_ops;
	void			  *icsk_ulp_data;
	void (*icsk_clean_acked)(struct sock *sk, u32 acked_seq);
	struct hlist_node         icsk_listen_portaddr_node;
	unsigned int		  (*icsk_sync_mss)(struct sock *sk, u32 pmtu);
	__u8			  icsk_ca_state:6,
				  icsk_ca_setsockopt:1,
				  icsk_ca_dst_locked:1;
	__u8			  icsk_retransmits;
	__u8			  icsk_pending;
	__u8			  icsk_backoff;
	__u8			  icsk_syn_retries;
	__u8			  icsk_probes_out;
	__u16			  icsk_ext_hdr_len;
	struct {
		__u8		  pending;	 /* ACK is pending			   */
		__u8		  quick;	 /* Scheduled number of quick acks	   */
		__u8		  pingpong;	 /* The session is interactive		   */
		__u8		  blocked;	 /* Delayed ACK was blocked by socket lock */
		__u32		  ato;		 /* Predicted tick of soft clock	   */
		unsigned long	  timeout;	 /* Currently scheduled timeout		   */
		__u32		  lrcvtime;	 /* timestamp of last received data packet */
		__u16		  last_seg_size; /* Size of last incoming segment	   */
		__u16		  rcv_mss;	 /* MSS used for delayed ACK decisions	   */
	} icsk_ack;
	struct {
		int		  enabled;

		/* Range of MTUs to search */
		int		  search_high;
		int		  search_low;

		/* Information on the current probe. */
		int		  probe_size;

		u32		  probe_timestamp;
	} icsk_mtup;
	u32			  icsk_user_timeout;

	u64			  icsk_ca_priv[104 / sizeof(u64)];
#define ICSK_CA_PRIV_SIZE      (13 * sizeof(u64))
};

#define ICSK_TIME_RETRANS	1	/* Retransmit timer */
#define ICSK_TIME_DACK		2	/* Delayed ack timer */
#define ICSK_TIME_PROBE0	3	/* Zero window probe timer */
#define ICSK_TIME_EARLY_RETRANS 4	/* Early retransmit timer */
#define ICSK_TIME_LOSS_PROBE	5	/* Tail loss probe timer */
#define ICSK_TIME_REO_TIMEOUT	6	/* Reordering timer */

static inline struct inet_connection_sock *inet_csk(const struct sock *sk)
{
	return (struct inet_connection_sock *)sk;
}

static inline void *inet_csk_ca(const struct sock *sk)
{
	return (void *)inet_csk(sk)->icsk_ca_priv;
}

struct sock *inet_csk_clone_lock(const struct sock *sk,
				 const struct request_sock *req,
				 const gfp_t priority);

enum inet_csk_ack_state_t {
	ICSK_ACK_SCHED	= 1,
	ICSK_ACK_TIMER  = 2,
	ICSK_ACK_PUSHED = 4,
	ICSK_ACK_PUSHED2 = 8,
	ICSK_ACK_NOW = 16	/* Send the next ACK immediately (once) */
};

void inet_csk_init_xmit_timers(struct sock *sk,
			       void (*retransmit_handler)(struct timer_list *),
			       void (*delack_handler)(struct timer_list *),
			       void (*keepalive_handler)(struct timer_list *));
void inet_csk_clear_xmit_timers(struct sock *sk);

static inline void inet_csk_schedule_ack(struct sock *sk)
{
	inet_csk(sk)->icsk_ack.pending |= ICSK_ACK_SCHED;
}

static inline int inet_csk_ack_scheduled(const struct sock *sk)
{
	return inet_csk(sk)->icsk_ack.pending & ICSK_ACK_SCHED;
}

static inline void inet_csk_delack_init(struct sock *sk)
{
	memset(&inet_csk(sk)->icsk_ack, 0, sizeof(inet_csk(sk)->icsk_ack));
}

void inet_csk_delete_keepalive_timer(struct sock *sk);
void inet_csk_reset_keepalive_timer(struct sock *sk, unsigned long timeout);

static inline void inet_csk_clear_xmit_timer(struct sock *sk, const int what)
{
	struct inet_connection_sock *icsk = inet_csk(sk);

	if (what == ICSK_TIME_RETRANS || what == ICSK_TIME_PROBE0) {
		icsk->icsk_pending = 0;
#ifdef INET_CSK_CLEAR_TIMERS
		sk_stop_timer(sk, &icsk->icsk_retransmit_timer);
#endif
	} else if (what == ICSK_TIME_DACK) {
		icsk->icsk_ack.blocked = icsk->icsk_ack.pending = 0;
#ifdef INET_CSK_CLEAR_TIMERS
		sk_stop_timer(sk, &icsk->icsk_delack_timer);
#endif
	} else {
		pr_debug("inet_csk BUG: unknown timer value\n");
	}
}

/*
 *	Reset the retransmission timer
 */
static inline void inet_csk_reset_xmit_timer(struct sock *sk, const int what,
					     unsigned long when,
					     const unsigned long max_when)
{
	struct inet_connection_sock *icsk = inet_csk(sk);

	if (when > max_when) {
		pr_debug("reset_xmit_timer: sk=%p %d when=0x%lx, caller=%p\n",
			 sk, what, when, (void *)_THIS_IP_);
		when = max_when;
	}

	if (what == ICSK_TIME_RETRANS || what == ICSK_TIME_PROBE0 ||
	    what == ICSK_TIME_EARLY_RETRANS || what == ICSK_TIME_LOSS_PROBE ||
	    what == ICSK_TIME_REO_TIMEOUT) {
		icsk->icsk_pending = what;
		icsk->icsk_timeout = jiffies + when;
		sk_reset_timer(sk, &icsk->icsk_retransmit_timer, icsk->icsk_timeout);
	} else if (what == ICSK_TIME_DACK) {
		icsk->icsk_ack.pending |= ICSK_ACK_TIMER;
		icsk->icsk_ack.timeout = jiffies + when;
		sk_reset_timer(sk, &icsk->icsk_delack_timer, icsk->icsk_ack.timeout);
	} else {
		pr_debug("inet_csk BUG: unknown timer value\n");
	}
}

static inline unsigned long
inet_csk_rto_backoff(const struct inet_connection_sock *icsk,
		     unsigned long max_when)
{
        u64 when = (u64)icsk->icsk_rto << icsk->icsk_backoff;

        return (unsigned long)min_t(u64, when, max_when);
}

struct sock *inet_csk_accept(struct sock *sk, int flags, int *err, bool kern);

int inet_csk_get_port(struct sock *sk, unsigned short snum);

struct dst_entry *inet_csk_route_req(const struct sock *sk, struct flowi4 *fl4,
				     const struct request_sock *req);
struct dst_entry *inet_csk_route_child_sock(const struct sock *sk,
					    struct sock *newsk,
					    const struct request_sock *req);

struct sock *inet_csk_reqsk_queue_add(struct sock *sk,
				      struct request_sock *req,
				      struct sock *child);
void inet_csk_reqsk_queue_hash_add(struct sock *sk, struct request_sock *req,
				   unsigned long timeout);
struct sock *inet_csk_complete_hashdance(struct sock *sk, struct sock *child,
					 struct request_sock *req,
					 bool own_req);

static inline void inet_csk_reqsk_queue_added(struct sock *sk)
{
	reqsk_queue_added(&inet_csk(sk)->icsk_accept_queue);
}

static inline int inet_csk_reqsk_queue_len(const struct sock *sk)
{
	return reqsk_queue_len(&inet_csk(sk)->icsk_accept_queue);
}

static inline int inet_csk_reqsk_queue_is_full(const struct sock *sk)
{
	return inet_csk_reqsk_queue_len(sk) >= sk->sk_max_ack_backlog;
}

void inet_csk_reqsk_queue_drop(struct sock *sk, struct request_sock *req);
void inet_csk_reqsk_queue_drop_and_put(struct sock *sk, struct request_sock *req);

void inet_csk_destroy_sock(struct sock *sk);
void inet_csk_prepare_forced_close(struct sock *sk);

/*
 * LISTEN is a special case for poll..
 */
static inline __poll_t inet_csk_listen_poll(const struct sock *sk)
{
	return !reqsk_queue_empty(&inet_csk(sk)->icsk_accept_queue) ?
			(EPOLLIN | EPOLLRDNORM) : 0;
}

int inet_csk_listen_start(struct sock *sk, int backlog);
void inet_csk_listen_stop(struct sock *sk);

void inet_csk_addr2sockaddr(struct sock *sk, struct sockaddr *uaddr);

int inet_csk_compat_getsockopt(struct sock *sk, int level, int optname,
			       char __user *optval, int __user *optlen);
int inet_csk_compat_setsockopt(struct sock *sk, int level, int optname,
			       char __user *optval, unsigned int optlen);

struct dst_entry *inet_csk_update_pmtu(struct sock *sk, u32 mtu);

#define TCP_PINGPONG_THRESH	3

static inline void inet_csk_enter_pingpong_mode(struct sock *sk)
{
	inet_csk(sk)->icsk_ack.pingpong = TCP_PINGPONG_THRESH;
}

static inline void inet_csk_exit_pingpong_mode(struct sock *sk)
{
	inet_csk(sk)->icsk_ack.pingpong = 0;
}

static inline bool inet_csk_in_pingpong_mode(struct sock *sk)
{
	return inet_csk(sk)->icsk_ack.pingpong >= TCP_PINGPONG_THRESH;
}

static inline void inet_csk_inc_pingpong_cnt(struct sock *sk)
{
	struct inet_connection_sock *icsk = inet_csk(sk);

	if (icsk->icsk_ack.pingpong < U8_MAX)
		icsk->icsk_ack.pingpong++;
}
#endif /* _INET_CONNECTION_SOCK_H */
Commit	Line	Data
463c84b9 ACM	1	/*
	2	* NET Generic infrastructure for INET connection oriented protocols.
	3	*
	4	* Definitions for inet_connection_sock
	5	*
	6	* Authors: Many people, see the TCP sources
	7	*
	8	* From code originally in TCP
	9	*
	10	* This program is free software; you can redistribute it and/or
	11	* modify it under the terms of the GNU General Public License
	12	* as published by the Free Software Foundation; either version
	13	* 2 of the License, or (at your option) any later version.
	14	*/
	15	#ifndef _INET_CONNECTION_SOCK_H
	16	#define _INET_CONNECTION_SOCK_H
	17
8292a17a	18	#include <linux/compiler.h>
3f421baa	19	#include <linux/string.h>
463c84b9	20	#include <linux/timer.h>
bd01f843	21	#include <linux/poll.h>
96d18d82	22	#include <linux/kernel.h>
14c85021 ACM	23
14c85021 ACM	24	#include <net/inet_sock.h>
463c84b9 ACM	25	#include <net/request_sock.h>
463c84b9 ACM	26
3f421baa ACM	27	/* Cancel timers, when they are not required. */
	28	#undef INET_CSK_CLEAR_TIMERS
	29
463c84b9	30	struct inet_bind_bucket;
6687e988	31	struct tcp_congestion_ops;
463c84b9	32
8292a17a ACM	33	/*
	34	* Pointers to address related TCP functions
	35	* (i.e. things that depend on the address family)
	36	*/
	37	struct inet_connection_sock_af_ops {
b0270e91	38	int (queue_xmit)(struct sock sk, struct sk_buff skb, struct flowi fl);
bb296246	39	void (send_check)(struct sock sk, struct sk_buff *skb);
8292a17a	40	int (rebuild_header)(struct sock sk);
5d299f3d	41	void (sk_rx_dst_set)(struct sock sk, const struct sk_buff *skb);
8292a17a	42	int (conn_request)(struct sock sk, struct sk_buff *skb);
0c27171e	43	struct sock (syn_recv_sock)(const struct sock sk, struct sk_buff skb,
8292a17a	44	struct request_sock *req,
5e0724d0 ED	45	struct dst_entry *dst,
	46	struct request_sock *req_unhash,
	47	bool *own_req);
850db6b8	48	u16 net_header_len;
67469601	49	u16 net_frag_header_len;
850db6b8	50	u16 sockaddr_len;
82695b30	51	int (setsockopt)(struct sock sk, int level, int optname,
b7058842	52	char __user *optval, unsigned int optlen);
82695b30	53	int (getsockopt)(struct sock sk, int level, int optname,
8292a17a	54	char __user optval, int __user optlen);
af01d537	55	#ifdef CONFIG_COMPAT
3fdadf7d DM	56	int (compat_setsockopt)(struct sock sk,
3fdadf7d DM	57	int level, int optname,
b7058842	58	char __user *optval, unsigned int optlen);
3fdadf7d DM	59	int (compat_getsockopt)(struct sock sk,
	60	int level, int optname,
	61	char __user optval, int __user optlen);
af01d537	62	#endif
8292a17a	63	void (addr2sockaddr)(struct sock sk, struct sockaddr *);
4fab9071	64	void (mtu_reduced)(struct sock sk);
8292a17a ACM	65	};
8292a17a ACM	66
463c84b9 ACM	67	/** inet_connection_sock - INET connection oriented sock
463c84b9 ACM	68	*
82695b30	69	* @icsk_accept_queue: FIFO of established children
463c84b9 ACM	70	* @icsk_bind_hash: Bind node
	71	* @icsk_timeout: Timeout
	72	* @icsk_retransmit_timer: Resend (no ack)
	73	* @icsk_rto: Retransmit timeout
d83d8461	74	* @icsk_pmtu_cookie Last pmtu seen by socket
6687e988	75	* @icsk_ca_ops Pluggable congestion control hook
8292a17a	76	* @icsk_af_ops Operations which are AF_INET{4,6} specific
734942cc DW	77	* @icsk_ulp_ops Pluggable ULP control hook
734942cc DW	78	* @icsk_ulp_data ULP private data
6dac1523	79	* @icsk_clean_acked Clean acked data hook
61b7c691	80	* @icsk_listen_portaddr_node hash to the portaddr listener hashtable
6687e988	81	* @icsk_ca_state: Congestion control state
463c84b9 ACM	82	* @icsk_retransmits: Number of unrecovered [RTO] timeouts
	83	* @icsk_pending: Scheduled timer event
	84	* @icsk_backoff: Backoff
	85	* @icsk_syn_retries: Number of allowed SYN (or equivalent) retries
6687e988	86	* @icsk_probes_out: unanswered 0 window probes
d83d8461	87	* @icsk_ext_hdr_len: Network protocol overhead (IP/IPv6 options)
463c84b9	88	* @icsk_ack: Delayed ACK control data
5d424d5a	89	* @icsk_mtup; MTU probing control data
463c84b9 ACM	90	*/
	91	struct inet_connection_sock {
	92	/* inet_sock has to be the first member! */
	93	struct inet_sock icsk_inet;
	94	struct request_sock_queue icsk_accept_queue;
	95	struct inet_bind_bucket *icsk_bind_hash;
	96	unsigned long icsk_timeout;
	97	struct timer_list icsk_retransmit_timer;
	98	struct timer_list icsk_delack_timer;
	99	__u32 icsk_rto;
d83d8461	100	__u32 icsk_pmtu_cookie;
770cfbcf SH	101	const struct tcp_congestion_ops *icsk_ca_ops;
770cfbcf SH	102	const struct inet_connection_sock_af_ops *icsk_af_ops;
734942cc DW	103	const struct tcp_ulp_ops *icsk_ulp_ops;
734942cc DW	104	void *icsk_ulp_data;
6dac1523	105	void (icsk_clean_acked)(struct sock sk, u32 acked_seq);
61b7c691	106	struct hlist_node icsk_listen_portaddr_node;
d83d8461	107	unsigned int (icsk_sync_mss)(struct sock sk, u32 pmtu);
9f950415 NC	108	__u8 icsk_ca_state:6,
9f950415 NC	109	icsk_ca_setsockopt:1,
c5c6a8ab	110	icsk_ca_dst_locked:1;
463c84b9 ACM	111	__u8 icsk_retransmits;
	112	__u8 icsk_pending;
	113	__u8 icsk_backoff;
	114	__u8 icsk_syn_retries;
6687e988	115	__u8 icsk_probes_out;
d83d8461	116	__u16 icsk_ext_hdr_len;
463c84b9 ACM	117	struct {
	118	__u8 pending; /* ACK is pending */
	119	__u8 quick; /* Scheduled number of quick acks */
	120	__u8 pingpong; /* The session is interactive */
	121	__u8 blocked; /* Delayed ACK was blocked by socket lock */
	122	__u32 ato; /* Predicted tick of soft clock */
	123	unsigned long timeout; /* Currently scheduled timeout */
	124	__u32 lrcvtime; /* timestamp of last received data packet */
	125	__u16 last_seg_size; /* Size of last incoming segment */
82695b30	126	__u16 rcv_mss; /* MSS used for delayed ACK decisions */
463c84b9	127	} icsk_ack;
5d424d5a JH	128	struct {
	129	int enabled;
	130
	131	/* Range of MTUs to search */
	132	int search_high;
	133	int search_low;
	134
	135	/* Information on the current probe. */
	136	int probe_size;
05cbc0db FD	137
05cbc0db FD	138	u32 probe_timestamp;
5d424d5a	139	} icsk_mtup;
dca43c75	140	u32 icsk_user_timeout;
b5d721d7	141
78dc70eb PJ	142	u64 icsk_ca_priv[104 / sizeof(u64)];
78dc70eb PJ	143	#define ICSK_CA_PRIV_SIZE (13 * sizeof(u64))
463c84b9 ACM	144	};
463c84b9 ACM	145
3f421baa ACM	146	#define ICSK_TIME_RETRANS 1 /* Retransmit timer */
	147	#define ICSK_TIME_DACK 2 /* Delayed ack timer */
	148	#define ICSK_TIME_PROBE0 3 /* Zero window probe timer */
6ba8a3b1 ND	149	#define ICSK_TIME_EARLY_RETRANS 4 /* Early retransmit timer */
6ba8a3b1 ND	150	#define ICSK_TIME_LOSS_PROBE 5 /* Tail loss probe timer */
57dde7f7	151	#define ICSK_TIME_REO_TIMEOUT 6 /* Reordering timer */
3f421baa	152
463c84b9 ACM	153	static inline struct inet_connection_sock inet_csk(const struct sock sk)
	154	{
	155	return (struct inet_connection_sock *)sk;
	156	}
	157
6687e988 ACM	158	static inline void inet_csk_ca(const struct sock sk)
	159	{
	160	return (void *)inet_csk(sk)->icsk_ca_priv;
	161	}
	162
1fd51155 JP	163	struct sock inet_csk_clone_lock(const struct sock sk,
	164	const struct request_sock *req,
	165	const gfp_t priority);
9f1d2604	166
3f421baa ACM	167	enum inet_csk_ack_state_t {
	168	ICSK_ACK_SCHED = 1,
	169	ICSK_ACK_TIMER = 2,
1ef9696c	170	ICSK_ACK_PUSHED = 4,
466466dc YC	171	ICSK_ACK_PUSHED2 = 8,
466466dc YC	172	ICSK_ACK_NOW = 16 /* Send the next ACK immediately (once) */
3f421baa ACM	173	};
3f421baa ACM	174
1fd51155	175	void inet_csk_init_xmit_timers(struct sock *sk,
59f379f9 KC	176	void (retransmit_handler)(struct timer_list ),
	177	void (delack_handler)(struct timer_list ),
	178	void (keepalive_handler)(struct timer_list ));
1fd51155	179	void inet_csk_clear_xmit_timers(struct sock *sk);
463c84b9	180
3f421baa ACM	181	static inline void inet_csk_schedule_ack(struct sock *sk)
	182	{
	183	inet_csk(sk)->icsk_ack.pending \|= ICSK_ACK_SCHED;
	184	}
	185
	186	static inline int inet_csk_ack_scheduled(const struct sock *sk)
	187	{
	188	return inet_csk(sk)->icsk_ack.pending & ICSK_ACK_SCHED;
	189	}
	190
	191	static inline void inet_csk_delack_init(struct sock *sk)
	192	{
	193	memset(&inet_csk(sk)->icsk_ack, 0, sizeof(inet_csk(sk)->icsk_ack));
	194	}
	195
1fd51155 JP	196	void inet_csk_delete_keepalive_timer(struct sock *sk);
1fd51155 JP	197	void inet_csk_reset_keepalive_timer(struct sock *sk, unsigned long timeout);
3f421baa	198
3f421baa ACM	199	static inline void inet_csk_clear_xmit_timer(struct sock *sk, const int what)
	200	{
	201	struct inet_connection_sock *icsk = inet_csk(sk);
82695b30	202
3f421baa ACM	203	if (what == ICSK_TIME_RETRANS \|\| what == ICSK_TIME_PROBE0) {
	204	icsk->icsk_pending = 0;
	205	#ifdef INET_CSK_CLEAR_TIMERS
	206	sk_stop_timer(sk, &icsk->icsk_retransmit_timer);
	207	#endif
	208	} else if (what == ICSK_TIME_DACK) {
	209	icsk->icsk_ack.blocked = icsk->icsk_ack.pending = 0;
	210	#ifdef INET_CSK_CLEAR_TIMERS
	211	sk_stop_timer(sk, &icsk->icsk_delack_timer);
	212	#endif
03bdfc00 JP	213	} else {
03bdfc00 JP	214	pr_debug("inet_csk BUG: unknown timer value\n");
3f421baa	215	}
3f421baa ACM	216	}
	217
	218	/*
	219	* Reset the retransmission timer
	220	*/
	221	static inline void inet_csk_reset_xmit_timer(struct sock *sk, const int what,
	222	unsigned long when,
	223	const unsigned long max_when)
	224	{
	225	struct inet_connection_sock *icsk = inet_csk(sk);
	226
	227	if (when > max_when) {
3f421baa	228	pr_debug("reset_xmit_timer: sk=%p %d when=0x%lx, caller=%p\n",
96d18d82	229	sk, what, when, (void *)_THIS_IP_);
3f421baa ACM	230	when = max_when;
	231	}
	232
6ba8a3b1	233	if (what == ICSK_TIME_RETRANS \|\| what == ICSK_TIME_PROBE0 \|\|
57dde7f7 YC	234	what == ICSK_TIME_EARLY_RETRANS \|\| what == ICSK_TIME_LOSS_PROBE \|\|
57dde7f7 YC	235	what == ICSK_TIME_REO_TIMEOUT) {
3f421baa ACM	236	icsk->icsk_pending = what;
	237	icsk->icsk_timeout = jiffies + when;
	238	sk_reset_timer(sk, &icsk->icsk_retransmit_timer, icsk->icsk_timeout);
	239	} else if (what == ICSK_TIME_DACK) {
	240	icsk->icsk_ack.pending \|= ICSK_ACK_TIMER;
	241	icsk->icsk_ack.timeout = jiffies + when;
	242	sk_reset_timer(sk, &icsk->icsk_delack_timer, icsk->icsk_ack.timeout);
03bdfc00 JP	243	} else {
03bdfc00 JP	244	pr_debug("inet_csk BUG: unknown timer value\n");
3f421baa	245	}
3f421baa ACM	246	}
3f421baa ACM	247
fcdd1cf4 ED	248	static inline unsigned long
	249	inet_csk_rto_backoff(const struct inet_connection_sock *icsk,
	250	unsigned long max_when)
	251	{
	252	u64 when = (u64)icsk->icsk_rto << icsk->icsk_backoff;
	253
	254	return (unsigned long)min_t(u64, when, max_when);
	255	}
	256
cdfbabfb	257	struct sock inet_csk_accept(struct sock sk, int flags, int *err, bool kern);
3f421baa	258
1fd51155	259	int inet_csk_get_port(struct sock *sk, unsigned short snum);
463c84b9	260
e5895bc6	261	struct dst_entry inet_csk_route_req(const struct sock sk, struct flowi4 *fl4,
1fd51155	262	const struct request_sock *req);
a2432c4f ED	263	struct dst_entry inet_csk_route_child_sock(const struct sock sk,
a2432c4f ED	264	struct sock *newsk,
ba3f7f04	265	const struct request_sock *req);
463c84b9	266
7716682c ED	267	struct sock inet_csk_reqsk_queue_add(struct sock sk,
	268	struct request_sock *req,
	269	struct sock *child);
1fd51155 JP	270	void inet_csk_reqsk_queue_hash_add(struct sock sk, struct request_sock req,
1fd51155 JP	271	unsigned long timeout);
5e0724d0 ED	272	struct sock inet_csk_complete_hashdance(struct sock sk, struct sock *child,
	273	struct request_sock *req,
	274	bool own_req);
3f421baa	275
2feda341	276	static inline void inet_csk_reqsk_queue_added(struct sock *sk)
3f421baa	277	{
fa76ce73	278	reqsk_queue_added(&inet_csk(sk)->icsk_accept_queue);
3f421baa ACM	279	}
	280
	281	static inline int inet_csk_reqsk_queue_len(const struct sock *sk)
	282	{
	283	return reqsk_queue_len(&inet_csk(sk)->icsk_accept_queue);
	284	}
	285
3f421baa ACM	286	static inline int inet_csk_reqsk_queue_is_full(const struct sock *sk)
3f421baa ACM	287	{
ef547f2a	288	return inet_csk_reqsk_queue_len(sk) >= sk->sk_max_ack_backlog;
3f421baa ACM	289	}
3f421baa ACM	290
b357a364	291	void inet_csk_reqsk_queue_drop(struct sock sk, struct request_sock req);
f03f2e15	292	void inet_csk_reqsk_queue_drop_and_put(struct sock sk, struct request_sock req);
3f421baa	293
1fd51155 JP	294	void inet_csk_destroy_sock(struct sock *sk);
1fd51155 JP	295	void inet_csk_prepare_forced_close(struct sock *sk);
dc40c7bc ACM	296
	297	/*
	298	* LISTEN is a special case for poll..
	299	*/
ade994f4	300	static inline __poll_t inet_csk_listen_poll(const struct sock *sk)
dc40c7bc ACM	301	{
dc40c7bc ACM	302	return !reqsk_queue_empty(&inet_csk(sk)->icsk_accept_queue) ?
a9a08845	303	(EPOLLIN \| EPOLLRDNORM) : 0;
dc40c7bc ACM	304	}
dc40c7bc ACM	305
f985c65c	306	int inet_csk_listen_start(struct sock *sk, int backlog);
1fd51155	307	void inet_csk_listen_stop(struct sock *sk);
295f7324	308
1fd51155	309	void inet_csk_addr2sockaddr(struct sock sk, struct sockaddr uaddr);
af05dc93	310
1fd51155 JP	311	int inet_csk_compat_getsockopt(struct sock *sk, int level, int optname,
	312	char __user optval, int __user optlen);
	313	int inet_csk_compat_setsockopt(struct sock *sk, int level, int optname,
	314	char __user *optval, unsigned int optlen);
80d0a69f	315
1fd51155	316	struct dst_entry inet_csk_update_pmtu(struct sock sk, u32 mtu);
31954cd8	317
4a41f453	318	#define TCP_PINGPONG_THRESH 3
31954cd8 WW	319
	320	static inline void inet_csk_enter_pingpong_mode(struct sock *sk)
	321	{
	322	inet_csk(sk)->icsk_ack.pingpong = TCP_PINGPONG_THRESH;
	323	}
	324
	325	static inline void inet_csk_exit_pingpong_mode(struct sock *sk)
	326	{
	327	inet_csk(sk)->icsk_ack.pingpong = 0;
	328	}
	329
	330	static inline bool inet_csk_in_pingpong_mode(struct sock *sk)
	331	{
	332	return inet_csk(sk)->icsk_ack.pingpong >= TCP_PINGPONG_THRESH;
	333	}
4a41f453 WW	334
	335	static inline void inet_csk_inc_pingpong_cnt(struct sock *sk)
	336	{
	337	struct inet_connection_sock *icsk = inet_csk(sk);
	338
	339	if (icsk->icsk_ack.pingpong < U8_MAX)
	340	icsk->icsk_ack.pingpong++;
	341	}
463c84b9	342	#endif /* _INET_CONNECTION_SOCK_H */