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

/* SPDX-License-Identifier: GPL-2.0-or-later */
/*
 * 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
 */
#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 <linux/sockptr.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 inet_bind2_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,
				  sockptr_t optval, unsigned int optlen);
	int	    (*getsockopt)(struct sock *sk, int level, int optname,
				  char __user *optval, int __user *optlen);
	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_bind2_hash:	   Bind node in the bhash2 table
 * @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_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
 * @icsk_probes_tstamp:    Probe timestamp (cleared by non-zero window ack)
 * @icsk_user_timeout:	   TCP_USER_TIMEOUT value
 */
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;
	struct inet_bind2_bucket  *icsk_bind2_hash;
	unsigned long		  icsk_timeout;
 	struct timer_list	  icsk_retransmit_timer;
 	struct timer_list	  icsk_delack_timer;
	__u32			  icsk_rto;
	__u32                     icsk_rto_min;
	__u32                     icsk_delack_max;
	__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 __rcu		  *icsk_ulp_data;
	void (*icsk_clean_acked)(struct sock *sk, u32 acked_seq);
	unsigned int		  (*icsk_sync_mss)(struct sock *sk, u32 pmtu);
	__u8			  icsk_ca_state:5,
				  icsk_ca_initialized:1,
				  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		  retry;	 /* Number of attempts			   */
		__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 {
		/* Range of MTUs to search */
		int		  search_high;
		int		  search_low;

		/* Information on the current probe. */
		u32		  probe_size:31,
		/* Is the MTUP feature enabled for this connection? */
				  enabled:1;

		u32		  probe_timestamp;
	} icsk_mtup;
	u32			  icsk_probes_tstamp;
	u32			  icsk_user_timeout;

	u64			  icsk_ca_priv[104 / sizeof(u64)];
#define ICSK_CA_PRIV_SIZE	  sizeof_field(struct inet_connection_sock, icsk_ca_priv)
};

#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_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.pending = 0;
		icsk->icsk_ack.retry = 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_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;
}

bool 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);

static inline unsigned long
reqsk_timeout(struct request_sock *req, unsigned long max_timeout)
{
	u64 timeout = (u64)req->timeout << req->num_timeout;

	return (unsigned long)min_t(u64, timeout, max_timeout);
}

static inline void inet_csk_prepare_for_destroy_sock(struct sock *sk)
{
	/* The below has to be done to allow calling inet_csk_destroy_sock */
	sock_set_flag(sk, SOCK_DEAD);
	this_cpu_inc(*sk->sk_prot->orphan_count);
}

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);
void inet_csk_listen_stop(struct sock *sk);

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

/* update the fast reuse flag when adding a socket */
void inet_csk_update_fastreuse(struct inet_bind_bucket *tb,
			       struct sock *sk);

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

#define TCP_PINGPONG_THRESH	1

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 bool inet_csk_has_ulp(struct sock *sk)
{
	return inet_sk(sk)->is_icsk && !!inet_csk(sk)->icsk_ulp_ops;
}

#endif /* _INET_CONNECTION_SOCK_H */
Commit	Line	Data
2874c5fd	1	/* SPDX-License-Identifier: GPL-2.0-or-later */
463c84b9 ACM	2	/*
	3	* NET Generic infrastructure for INET connection oriented protocols.
	4	*
	5	* Definitions for inet_connection_sock
	6	*
	7	* Authors: Many people, see the TCP sources
	8	*
	9	* From code originally in TCP
463c84b9 ACM	10	*/
	11	#ifndef _INET_CONNECTION_SOCK_H
	12	#define _INET_CONNECTION_SOCK_H
	13
8292a17a	14	#include <linux/compiler.h>
3f421baa	15	#include <linux/string.h>
463c84b9	16	#include <linux/timer.h>
bd01f843	17	#include <linux/poll.h>
96d18d82	18	#include <linux/kernel.h>
a7b75c5a	19	#include <linux/sockptr.h>
14c85021 ACM	20
14c85021 ACM	21	#include <net/inet_sock.h>
463c84b9 ACM	22	#include <net/request_sock.h>
463c84b9 ACM	23
3f421baa ACM	24	/* Cancel timers, when they are not required. */
	25	#undef INET_CSK_CLEAR_TIMERS
	26
463c84b9	27	struct inet_bind_bucket;
28044fc1	28	struct inet_bind2_bucket;
6687e988	29	struct tcp_congestion_ops;
463c84b9	30
8292a17a ACM	31	/*
	32	* Pointers to address related TCP functions
	33	* (i.e. things that depend on the address family)
	34	*/
	35	struct inet_connection_sock_af_ops {
b0270e91	36	int (queue_xmit)(struct sock sk, struct sk_buff skb, struct flowi fl);
bb296246	37	void (send_check)(struct sock sk, struct sk_buff *skb);
8292a17a	38	int (rebuild_header)(struct sock sk);
5d299f3d	39	void (sk_rx_dst_set)(struct sock sk, const struct sk_buff *skb);
8292a17a	40	int (conn_request)(struct sock sk, struct sk_buff *skb);
0c27171e	41	struct sock (syn_recv_sock)(const struct sock sk, struct sk_buff skb,
8292a17a	42	struct request_sock *req,
5e0724d0 ED	43	struct dst_entry *dst,
	44	struct request_sock *req_unhash,
	45	bool *own_req);
850db6b8	46	u16 net_header_len;
67469601	47	u16 net_frag_header_len;
850db6b8	48	u16 sockaddr_len;
82695b30	49	int (setsockopt)(struct sock sk, int level, int optname,
a7b75c5a	50	sockptr_t optval, unsigned int optlen);
82695b30	51	int (getsockopt)(struct sock sk, int level, int optname,
8292a17a ACM	52	char __user optval, int __user optlen);
8292a17a ACM	53	void (addr2sockaddr)(struct sock sk, struct sockaddr *);
4fab9071	54	void (mtu_reduced)(struct sock sk);
8292a17a ACM	55	};
8292a17a ACM	56
463c84b9 ACM	57	/** inet_connection_sock - INET connection oriented sock
463c84b9 ACM	58	*
82695b30	59	* @icsk_accept_queue: FIFO of established children
463c84b9	60	* @icsk_bind_hash: Bind node
28044fc1	61	* @icsk_bind2_hash: Bind node in the bhash2 table
463c84b9 ACM	62	* @icsk_timeout: Timeout
	63	* @icsk_retransmit_timer: Resend (no ack)
	64	* @icsk_rto: Retransmit timeout
d83d8461	65	* @icsk_pmtu_cookie Last pmtu seen by socket
6687e988	66	* @icsk_ca_ops Pluggable congestion control hook
8292a17a	67	* @icsk_af_ops Operations which are AF_INET{4,6} specific
734942cc DW	68	* @icsk_ulp_ops Pluggable ULP control hook
734942cc DW	69	* @icsk_ulp_data ULP private data
6dac1523	70	* @icsk_clean_acked Clean acked data hook
6687e988	71	* @icsk_ca_state: Congestion control state
463c84b9 ACM	72	* @icsk_retransmits: Number of unrecovered [RTO] timeouts
	73	* @icsk_pending: Scheduled timer event
	74	* @icsk_backoff: Backoff
	75	* @icsk_syn_retries: Number of allowed SYN (or equivalent) retries
6687e988	76	* @icsk_probes_out: unanswered 0 window probes
d83d8461	77	* @icsk_ext_hdr_len: Network protocol overhead (IP/IPv6 options)
463c84b9	78	* @icsk_ack: Delayed ACK control data
5d424d5a	79	* @icsk_mtup; MTU probing control data
9d9b1ee0 EC	80	* @icsk_probes_tstamp: Probe timestamp (cleared by non-zero window ack)
9d9b1ee0 EC	81	* @icsk_user_timeout: TCP_USER_TIMEOUT value
463c84b9 ACM	82	*/
	83	struct inet_connection_sock {
	84	/* inet_sock has to be the first member! */
	85	struct inet_sock icsk_inet;
	86	struct request_sock_queue icsk_accept_queue;
	87	struct inet_bind_bucket *icsk_bind_hash;
28044fc1	88	struct inet_bind2_bucket *icsk_bind2_hash;
463c84b9 ACM	89	unsigned long icsk_timeout;
	90	struct timer_list icsk_retransmit_timer;
	91	struct timer_list icsk_delack_timer;
	92	__u32 icsk_rto;
ca584ba0	93	__u32 icsk_rto_min;
2b8ee4f0	94	__u32 icsk_delack_max;
d83d8461	95	__u32 icsk_pmtu_cookie;
770cfbcf SH	96	const struct tcp_congestion_ops *icsk_ca_ops;
770cfbcf SH	97	const struct inet_connection_sock_af_ops *icsk_af_ops;
734942cc	98	const struct tcp_ulp_ops *icsk_ulp_ops;
15a7dea7	99	void __rcu *icsk_ulp_data;
6dac1523	100	void (icsk_clean_acked)(struct sock sk, u32 acked_seq);
d83d8461	101	unsigned int (icsk_sync_mss)(struct sock sk, u32 pmtu);
8919a9b3 NC	102	__u8 icsk_ca_state:5,
8919a9b3 NC	103	icsk_ca_initialized:1,
9f950415	104	icsk_ca_setsockopt:1,
c5c6a8ab	105	icsk_ca_dst_locked:1;
463c84b9 ACM	106	__u8 icsk_retransmits;
	107	__u8 icsk_pending;
	108	__u8 icsk_backoff;
	109	__u8 icsk_syn_retries;
6687e988	110	__u8 icsk_probes_out;
d83d8461	111	__u16 icsk_ext_hdr_len;
463c84b9 ACM	112	struct {
	113	__u8 pending; /* ACK is pending */
	114	__u8 quick; /* Scheduled number of quick acks */
	115	__u8 pingpong; /* The session is interactive */
a37c2134	116	__u8 retry; /* Number of attempts */
463c84b9 ACM	117	__u32 ato; /* Predicted tick of soft clock */
	118	unsigned long timeout; /* Currently scheduled timeout */
	119	__u32 lrcvtime; /* timestamp of last received data packet */
	120	__u16 last_seg_size; /* Size of last incoming segment */
82695b30	121	__u16 rcv_mss; /* MSS used for delayed ACK decisions */
463c84b9	122	} icsk_ack;
5d424d5a	123	struct {
5d424d5a JH	124	/* Range of MTUs to search */
	125	int search_high;
	126	int search_low;
	127
	128	/* Information on the current probe. */
14e8e0f6 NC	129	u32 probe_size:31,
	130	/* Is the MTUP feature enabled for this connection? */
	131	enabled:1;
05cbc0db FD	132
05cbc0db FD	133	u32 probe_timestamp;
5d424d5a	134	} icsk_mtup;
9d9b1ee0	135	u32 icsk_probes_tstamp;
dca43c75	136	u32 icsk_user_timeout;
b5d721d7	137
78dc70eb	138	u64 icsk_ca_priv[104 / sizeof(u64)];
3f8ad50a	139	#define ICSK_CA_PRIV_SIZE sizeof_field(struct inet_connection_sock, icsk_ca_priv)
463c84b9 ACM	140	};
463c84b9 ACM	141
3f421baa ACM	142	#define ICSK_TIME_RETRANS 1 /* Retransmit timer */
	143	#define ICSK_TIME_DACK 2 /* Delayed ack timer */
	144	#define ICSK_TIME_PROBE0 3 /* Zero window probe timer */
6ba8a3b1	145	#define ICSK_TIME_LOSS_PROBE 5 /* Tail loss probe timer */
57dde7f7	146	#define ICSK_TIME_REO_TIMEOUT 6 /* Reordering timer */
3f421baa	147
463c84b9 ACM	148	static inline struct inet_connection_sock inet_csk(const struct sock sk)
	149	{
	150	return (struct inet_connection_sock *)sk;
	151	}
	152
6687e988 ACM	153	static inline void inet_csk_ca(const struct sock sk)
	154	{
	155	return (void *)inet_csk(sk)->icsk_ca_priv;
	156	}
	157
1fd51155 JP	158	struct sock inet_csk_clone_lock(const struct sock sk,
	159	const struct request_sock *req,
	160	const gfp_t priority);
9f1d2604	161
3f421baa ACM	162	enum inet_csk_ack_state_t {
	163	ICSK_ACK_SCHED = 1,
	164	ICSK_ACK_TIMER = 2,
1ef9696c	165	ICSK_ACK_PUSHED = 4,
466466dc YC	166	ICSK_ACK_PUSHED2 = 8,
466466dc YC	167	ICSK_ACK_NOW = 16 /* Send the next ACK immediately (once) */
3f421baa ACM	168	};
3f421baa ACM	169
1fd51155	170	void inet_csk_init_xmit_timers(struct sock *sk,
59f379f9 KC	171	void (retransmit_handler)(struct timer_list ),
	172	void (delack_handler)(struct timer_list ),
	173	void (keepalive_handler)(struct timer_list ));
1fd51155	174	void inet_csk_clear_xmit_timers(struct sock *sk);
463c84b9	175
3f421baa ACM	176	static inline void inet_csk_schedule_ack(struct sock *sk)
	177	{
	178	inet_csk(sk)->icsk_ack.pending \|= ICSK_ACK_SCHED;
	179	}
	180
	181	static inline int inet_csk_ack_scheduled(const struct sock *sk)
	182	{
	183	return inet_csk(sk)->icsk_ack.pending & ICSK_ACK_SCHED;
	184	}
	185
	186	static inline void inet_csk_delack_init(struct sock *sk)
	187	{
	188	memset(&inet_csk(sk)->icsk_ack, 0, sizeof(inet_csk(sk)->icsk_ack));
	189	}
	190
1fd51155 JP	191	void inet_csk_delete_keepalive_timer(struct sock *sk);
1fd51155 JP	192	void inet_csk_reset_keepalive_timer(struct sock *sk, unsigned long timeout);
3f421baa	193
3f421baa ACM	194	static inline void inet_csk_clear_xmit_timer(struct sock *sk, const int what)
	195	{
	196	struct inet_connection_sock *icsk = inet_csk(sk);
82695b30	197
3f421baa ACM	198	if (what == ICSK_TIME_RETRANS \|\| what == ICSK_TIME_PROBE0) {
	199	icsk->icsk_pending = 0;
	200	#ifdef INET_CSK_CLEAR_TIMERS
	201	sk_stop_timer(sk, &icsk->icsk_retransmit_timer);
	202	#endif
	203	} else if (what == ICSK_TIME_DACK) {
b6b6d653	204	icsk->icsk_ack.pending = 0;
a37c2134	205	icsk->icsk_ack.retry = 0;
3f421baa ACM	206	#ifdef INET_CSK_CLEAR_TIMERS
	207	sk_stop_timer(sk, &icsk->icsk_delack_timer);
	208	#endif
03bdfc00 JP	209	} else {
03bdfc00 JP	210	pr_debug("inet_csk BUG: unknown timer value\n");
3f421baa	211	}
3f421baa ACM	212	}
	213
	214	/*
	215	* Reset the retransmission timer
	216	*/
	217	static inline void inet_csk_reset_xmit_timer(struct sock *sk, const int what,
	218	unsigned long when,
	219	const unsigned long max_when)
	220	{
	221	struct inet_connection_sock *icsk = inet_csk(sk);
	222
	223	if (when > max_when) {
3f421baa	224	pr_debug("reset_xmit_timer: sk=%p %d when=0x%lx, caller=%p\n",
96d18d82	225	sk, what, when, (void *)_THIS_IP_);
3f421baa ACM	226	when = max_when;
	227	}
	228
6ba8a3b1	229	if (what == ICSK_TIME_RETRANS \|\| what == ICSK_TIME_PROBE0 \|\|
a05a7280	230	what == ICSK_TIME_LOSS_PROBE \|\| what == ICSK_TIME_REO_TIMEOUT) {
3f421baa ACM	231	icsk->icsk_pending = what;
	232	icsk->icsk_timeout = jiffies + when;
	233	sk_reset_timer(sk, &icsk->icsk_retransmit_timer, icsk->icsk_timeout);
	234	} else if (what == ICSK_TIME_DACK) {
	235	icsk->icsk_ack.pending \|= ICSK_ACK_TIMER;
	236	icsk->icsk_ack.timeout = jiffies + when;
	237	sk_reset_timer(sk, &icsk->icsk_delack_timer, icsk->icsk_ack.timeout);
03bdfc00 JP	238	} else {
03bdfc00 JP	239	pr_debug("inet_csk BUG: unknown timer value\n");
3f421baa	240	}
3f421baa ACM	241	}
3f421baa ACM	242
fcdd1cf4 ED	243	static inline unsigned long
	244	inet_csk_rto_backoff(const struct inet_connection_sock *icsk,
	245	unsigned long max_when)
	246	{
	247	u64 when = (u64)icsk->icsk_rto << icsk->icsk_backoff;
	248
	249	return (unsigned long)min_t(u64, when, max_when);
	250	}
	251
cdfbabfb	252	struct sock inet_csk_accept(struct sock sk, int flags, int *err, bool kern);
3f421baa	253
1fd51155	254	int inet_csk_get_port(struct sock *sk, unsigned short snum);
463c84b9	255
e5895bc6	256	struct dst_entry inet_csk_route_req(const struct sock sk, struct flowi4 *fl4,
1fd51155	257	const struct request_sock *req);
a2432c4f ED	258	struct dst_entry inet_csk_route_child_sock(const struct sock sk,
a2432c4f ED	259	struct sock *newsk,
ba3f7f04	260	const struct request_sock *req);
463c84b9	261
7716682c ED	262	struct sock inet_csk_reqsk_queue_add(struct sock sk,
	263	struct request_sock *req,
	264	struct sock *child);
1fd51155 JP	265	void inet_csk_reqsk_queue_hash_add(struct sock sk, struct request_sock req,
1fd51155 JP	266	unsigned long timeout);
5e0724d0 ED	267	struct sock inet_csk_complete_hashdance(struct sock sk, struct sock *child,
	268	struct request_sock *req,
	269	bool own_req);
3f421baa	270
2feda341	271	static inline void inet_csk_reqsk_queue_added(struct sock *sk)
3f421baa	272	{
fa76ce73	273	reqsk_queue_added(&inet_csk(sk)->icsk_accept_queue);
3f421baa ACM	274	}
	275
	276	static inline int inet_csk_reqsk_queue_len(const struct sock *sk)
	277	{
	278	return reqsk_queue_len(&inet_csk(sk)->icsk_accept_queue);
	279	}
	280
3f421baa ACM	281	static inline int inet_csk_reqsk_queue_is_full(const struct sock *sk)
3f421baa ACM	282	{
ef547f2a	283	return inet_csk_reqsk_queue_len(sk) >= sk->sk_max_ack_backlog;
3f421baa ACM	284	}
3f421baa ACM	285
7233da86	286	bool inet_csk_reqsk_queue_drop(struct sock sk, struct request_sock req);
f03f2e15	287	void inet_csk_reqsk_queue_drop_and_put(struct sock sk, struct request_sock req);
3f421baa	288
5903123f AK	289	static inline unsigned long
	290	reqsk_timeout(struct request_sock *req, unsigned long max_timeout)
	291	{
	292	u64 timeout = (u64)req->timeout << req->num_timeout;
	293
	294	return (unsigned long)min_t(u64, timeout, max_timeout);
	295	}
	296
2f8a397d PA	297	static inline void inet_csk_prepare_for_destroy_sock(struct sock *sk)
	298	{
	299	/* The below has to be done to allow calling inet_csk_destroy_sock */
	300	sock_set_flag(sk, SOCK_DEAD);
19757ceb	301	this_cpu_inc(*sk->sk_prot->orphan_count);
2f8a397d PA	302	}
2f8a397d PA	303
1fd51155 JP	304	void inet_csk_destroy_sock(struct sock *sk);
1fd51155 JP	305	void inet_csk_prepare_forced_close(struct sock *sk);
dc40c7bc ACM	306
	307	/*
	308	* LISTEN is a special case for poll..
	309	*/
ade994f4	310	static inline __poll_t inet_csk_listen_poll(const struct sock *sk)
dc40c7bc ACM	311	{
dc40c7bc ACM	312	return !reqsk_queue_empty(&inet_csk(sk)->icsk_accept_queue) ?
a9a08845	313	(EPOLLIN \| EPOLLRDNORM) : 0;
dc40c7bc ACM	314	}
dc40c7bc ACM	315
e7049395	316	int inet_csk_listen_start(struct sock *sk);
1fd51155	317	void inet_csk_listen_stop(struct sock *sk);
295f7324	318
1fd51155	319	void inet_csk_addr2sockaddr(struct sock sk, struct sockaddr uaddr);
af05dc93	320
62ffc589 TF	321	/* update the fast reuse flag when adding a socket */
	322	void inet_csk_update_fastreuse(struct inet_bind_bucket *tb,
	323	struct sock *sk);
	324
1fd51155	325	struct dst_entry inet_csk_update_pmtu(struct sock sk, u32 mtu);
31954cd8	326
4d8f24ee	327	#define TCP_PINGPONG_THRESH 1
31954cd8 WW	328
	329	static inline void inet_csk_enter_pingpong_mode(struct sock *sk)
	330	{
	331	inet_csk(sk)->icsk_ack.pingpong = TCP_PINGPONG_THRESH;
	332	}
	333
	334	static inline void inet_csk_exit_pingpong_mode(struct sock *sk)
	335	{
	336	inet_csk(sk)->icsk_ack.pingpong = 0;
	337	}
	338
	339	static inline bool inet_csk_in_pingpong_mode(struct sock *sk)
	340	{
	341	return inet_csk(sk)->icsk_ack.pingpong >= TCP_PINGPONG_THRESH;
	342	}
4a41f453	343
7b70973d LB	344	static inline bool inet_csk_has_ulp(struct sock *sk)
	345	{
	346	return inet_sk(sk)->is_icsk && !!inet_csk(sk)->icsk_ulp_ops;
	347	}
	348
463c84b9	349	#endif /* _INET_CONNECTION_SOCK_H */