[mirror_ubuntu-jammy-kernel.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 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_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_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);
	struct hlist_node         icsk_listen_portaddr_node;
	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 {
		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.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_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);

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);
	percpu_counter_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, int backlog);
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	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++;
}

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;
6687e988	28	struct tcp_congestion_ops;
463c84b9	29
8292a17a ACM	30	/*
	31	* Pointers to address related TCP functions
	32	* (i.e. things that depend on the address family)
	33	*/
	34	struct inet_connection_sock_af_ops {
b0270e91	35	int (queue_xmit)(struct sock sk, struct sk_buff skb, struct flowi fl);
bb296246	36	void (send_check)(struct sock sk, struct sk_buff *skb);
8292a17a	37	int (rebuild_header)(struct sock sk);
5d299f3d	38	void (sk_rx_dst_set)(struct sock sk, const struct sk_buff *skb);
8292a17a	39	int (conn_request)(struct sock sk, struct sk_buff *skb);
0c27171e	40	struct sock (syn_recv_sock)(const struct sock sk, struct sk_buff skb,
8292a17a	41	struct request_sock *req,
5e0724d0 ED	42	struct dst_entry *dst,
	43	struct request_sock *req_unhash,
	44	bool *own_req);
850db6b8	45	u16 net_header_len;
67469601	46	u16 net_frag_header_len;
850db6b8	47	u16 sockaddr_len;
82695b30	48	int (setsockopt)(struct sock sk, int level, int optname,
a7b75c5a	49	sockptr_t optval, unsigned int optlen);
82695b30	50	int (getsockopt)(struct sock sk, int level, int optname,
8292a17a ACM	51	char __user optval, int __user optlen);
8292a17a ACM	52	void (addr2sockaddr)(struct sock sk, struct sockaddr *);
4fab9071	53	void (mtu_reduced)(struct sock sk);
8292a17a ACM	54	};
8292a17a ACM	55
463c84b9 ACM	56	/** inet_connection_sock - INET connection oriented sock
463c84b9 ACM	57	*
82695b30	58	* @icsk_accept_queue: FIFO of established children
463c84b9 ACM	59	* @icsk_bind_hash: Bind node
	60	* @icsk_timeout: Timeout
	61	* @icsk_retransmit_timer: Resend (no ack)
	62	* @icsk_rto: Retransmit timeout
d83d8461	63	* @icsk_pmtu_cookie Last pmtu seen by socket
6687e988	64	* @icsk_ca_ops Pluggable congestion control hook
8292a17a	65	* @icsk_af_ops Operations which are AF_INET{4,6} specific
734942cc DW	66	* @icsk_ulp_ops Pluggable ULP control hook
734942cc DW	67	* @icsk_ulp_data ULP private data
6dac1523	68	* @icsk_clean_acked Clean acked data hook
61b7c691	69	* @icsk_listen_portaddr_node hash to the portaddr listener hashtable
6687e988	70	* @icsk_ca_state: Congestion control state
463c84b9 ACM	71	* @icsk_retransmits: Number of unrecovered [RTO] timeouts
	72	* @icsk_pending: Scheduled timer event
	73	* @icsk_backoff: Backoff
	74	* @icsk_syn_retries: Number of allowed SYN (or equivalent) retries
6687e988	75	* @icsk_probes_out: unanswered 0 window probes
d83d8461	76	* @icsk_ext_hdr_len: Network protocol overhead (IP/IPv6 options)
463c84b9	77	* @icsk_ack: Delayed ACK control data
5d424d5a	78	* @icsk_mtup; MTU probing control data
463c84b9 ACM	79	*/
	80	struct inet_connection_sock {
	81	/* inet_sock has to be the first member! */
	82	struct inet_sock icsk_inet;
	83	struct request_sock_queue icsk_accept_queue;
	84	struct inet_bind_bucket *icsk_bind_hash;
	85	unsigned long icsk_timeout;
	86	struct timer_list icsk_retransmit_timer;
	87	struct timer_list icsk_delack_timer;
	88	__u32 icsk_rto;
ca584ba0	89	__u32 icsk_rto_min;
2b8ee4f0	90	__u32 icsk_delack_max;
d83d8461	91	__u32 icsk_pmtu_cookie;
770cfbcf SH	92	const struct tcp_congestion_ops *icsk_ca_ops;
770cfbcf SH	93	const struct inet_connection_sock_af_ops *icsk_af_ops;
734942cc	94	const struct tcp_ulp_ops *icsk_ulp_ops;
15a7dea7	95	void __rcu *icsk_ulp_data;
6dac1523	96	void (icsk_clean_acked)(struct sock sk, u32 acked_seq);
61b7c691	97	struct hlist_node icsk_listen_portaddr_node;
d83d8461	98	unsigned int (icsk_sync_mss)(struct sock sk, u32 pmtu);
8919a9b3 NC	99	__u8 icsk_ca_state:5,
8919a9b3 NC	100	icsk_ca_initialized:1,
9f950415	101	icsk_ca_setsockopt:1,
c5c6a8ab	102	icsk_ca_dst_locked:1;
463c84b9 ACM	103	__u8 icsk_retransmits;
	104	__u8 icsk_pending;
	105	__u8 icsk_backoff;
	106	__u8 icsk_syn_retries;
6687e988	107	__u8 icsk_probes_out;
d83d8461	108	__u16 icsk_ext_hdr_len;
463c84b9 ACM	109	struct {
	110	__u8 pending; /* ACK is pending */
	111	__u8 quick; /* Scheduled number of quick acks */
	112	__u8 pingpong; /* The session is interactive */
a37c2134	113	__u8 retry; /* Number of attempts */
463c84b9 ACM	114	__u32 ato; /* Predicted tick of soft clock */
	115	unsigned long timeout; /* Currently scheduled timeout */
	116	__u32 lrcvtime; /* timestamp of last received data packet */
	117	__u16 last_seg_size; /* Size of last incoming segment */
82695b30	118	__u16 rcv_mss; /* MSS used for delayed ACK decisions */
463c84b9	119	} icsk_ack;
5d424d5a JH	120	struct {
	121	int enabled;
	122
	123	/* Range of MTUs to search */
	124	int search_high;
	125	int search_low;
	126
	127	/* Information on the current probe. */
	128	int probe_size;
05cbc0db FD	129
05cbc0db FD	130	u32 probe_timestamp;
5d424d5a	131	} icsk_mtup;
dca43c75	132	u32 icsk_user_timeout;
b5d721d7	133
78dc70eb PJ	134	u64 icsk_ca_priv[104 / sizeof(u64)];
78dc70eb PJ	135	#define ICSK_CA_PRIV_SIZE (13 * sizeof(u64))
463c84b9 ACM	136	};
463c84b9 ACM	137
3f421baa ACM	138	#define ICSK_TIME_RETRANS 1 /* Retransmit timer */
	139	#define ICSK_TIME_DACK 2 /* Delayed ack timer */
	140	#define ICSK_TIME_PROBE0 3 /* Zero window probe timer */
6ba8a3b1 ND	141	#define ICSK_TIME_EARLY_RETRANS 4 /* Early retransmit timer */
6ba8a3b1 ND	142	#define ICSK_TIME_LOSS_PROBE 5 /* Tail loss probe timer */
57dde7f7	143	#define ICSK_TIME_REO_TIMEOUT 6 /* Reordering timer */
3f421baa	144
463c84b9 ACM	145	static inline struct inet_connection_sock inet_csk(const struct sock sk)
	146	{
	147	return (struct inet_connection_sock *)sk;
	148	}
	149
6687e988 ACM	150	static inline void inet_csk_ca(const struct sock sk)
	151	{
	152	return (void *)inet_csk(sk)->icsk_ca_priv;
	153	}
	154
1fd51155 JP	155	struct sock inet_csk_clone_lock(const struct sock sk,
	156	const struct request_sock *req,
	157	const gfp_t priority);
9f1d2604	158
3f421baa ACM	159	enum inet_csk_ack_state_t {
	160	ICSK_ACK_SCHED = 1,
	161	ICSK_ACK_TIMER = 2,
1ef9696c	162	ICSK_ACK_PUSHED = 4,
466466dc YC	163	ICSK_ACK_PUSHED2 = 8,
466466dc YC	164	ICSK_ACK_NOW = 16 /* Send the next ACK immediately (once) */
3f421baa ACM	165	};
3f421baa ACM	166
1fd51155	167	void inet_csk_init_xmit_timers(struct sock *sk,
59f379f9 KC	168	void (retransmit_handler)(struct timer_list ),
	169	void (delack_handler)(struct timer_list ),
	170	void (keepalive_handler)(struct timer_list ));
1fd51155	171	void inet_csk_clear_xmit_timers(struct sock *sk);
463c84b9	172
3f421baa ACM	173	static inline void inet_csk_schedule_ack(struct sock *sk)
	174	{
	175	inet_csk(sk)->icsk_ack.pending \|= ICSK_ACK_SCHED;
	176	}
	177
	178	static inline int inet_csk_ack_scheduled(const struct sock *sk)
	179	{
	180	return inet_csk(sk)->icsk_ack.pending & ICSK_ACK_SCHED;
	181	}
	182
	183	static inline void inet_csk_delack_init(struct sock *sk)
	184	{
	185	memset(&inet_csk(sk)->icsk_ack, 0, sizeof(inet_csk(sk)->icsk_ack));
	186	}
	187
1fd51155 JP	188	void inet_csk_delete_keepalive_timer(struct sock *sk);
1fd51155 JP	189	void inet_csk_reset_keepalive_timer(struct sock *sk, unsigned long timeout);
3f421baa	190
3f421baa ACM	191	static inline void inet_csk_clear_xmit_timer(struct sock *sk, const int what)
	192	{
	193	struct inet_connection_sock *icsk = inet_csk(sk);
82695b30	194
3f421baa ACM	195	if (what == ICSK_TIME_RETRANS \|\| what == ICSK_TIME_PROBE0) {
	196	icsk->icsk_pending = 0;
	197	#ifdef INET_CSK_CLEAR_TIMERS
	198	sk_stop_timer(sk, &icsk->icsk_retransmit_timer);
	199	#endif
	200	} else if (what == ICSK_TIME_DACK) {
b6b6d653	201	icsk->icsk_ack.pending = 0;
a37c2134	202	icsk->icsk_ack.retry = 0;
3f421baa ACM	203	#ifdef INET_CSK_CLEAR_TIMERS
	204	sk_stop_timer(sk, &icsk->icsk_delack_timer);
	205	#endif
03bdfc00 JP	206	} else {
03bdfc00 JP	207	pr_debug("inet_csk BUG: unknown timer value\n");
3f421baa	208	}
3f421baa ACM	209	}
	210
	211	/*
	212	* Reset the retransmission timer
	213	*/
	214	static inline void inet_csk_reset_xmit_timer(struct sock *sk, const int what,
	215	unsigned long when,
	216	const unsigned long max_when)
	217	{
	218	struct inet_connection_sock *icsk = inet_csk(sk);
	219
	220	if (when > max_when) {
3f421baa	221	pr_debug("reset_xmit_timer: sk=%p %d when=0x%lx, caller=%p\n",
96d18d82	222	sk, what, when, (void *)_THIS_IP_);
3f421baa ACM	223	when = max_when;
	224	}
	225
6ba8a3b1	226	if (what == ICSK_TIME_RETRANS \|\| what == ICSK_TIME_PROBE0 \|\|
57dde7f7 YC	227	what == ICSK_TIME_EARLY_RETRANS \|\| what == ICSK_TIME_LOSS_PROBE \|\|
57dde7f7 YC	228	what == ICSK_TIME_REO_TIMEOUT) {
3f421baa ACM	229	icsk->icsk_pending = what;
	230	icsk->icsk_timeout = jiffies + when;
	231	sk_reset_timer(sk, &icsk->icsk_retransmit_timer, icsk->icsk_timeout);
	232	} else if (what == ICSK_TIME_DACK) {
	233	icsk->icsk_ack.pending \|= ICSK_ACK_TIMER;
	234	icsk->icsk_ack.timeout = jiffies + when;
	235	sk_reset_timer(sk, &icsk->icsk_delack_timer, icsk->icsk_ack.timeout);
03bdfc00 JP	236	} else {
03bdfc00 JP	237	pr_debug("inet_csk BUG: unknown timer value\n");
3f421baa	238	}
3f421baa ACM	239	}
3f421baa ACM	240
fcdd1cf4 ED	241	static inline unsigned long
	242	inet_csk_rto_backoff(const struct inet_connection_sock *icsk,
	243	unsigned long max_when)
	244	{
	245	u64 when = (u64)icsk->icsk_rto << icsk->icsk_backoff;
	246
	247	return (unsigned long)min_t(u64, when, max_when);
	248	}
	249
cdfbabfb	250	struct sock inet_csk_accept(struct sock sk, int flags, int *err, bool kern);
3f421baa	251
1fd51155	252	int inet_csk_get_port(struct sock *sk, unsigned short snum);
463c84b9	253
e5895bc6	254	struct dst_entry inet_csk_route_req(const struct sock sk, struct flowi4 *fl4,
1fd51155	255	const struct request_sock *req);
a2432c4f ED	256	struct dst_entry inet_csk_route_child_sock(const struct sock sk,
a2432c4f ED	257	struct sock *newsk,
ba3f7f04	258	const struct request_sock *req);
463c84b9	259
7716682c ED	260	struct sock inet_csk_reqsk_queue_add(struct sock sk,
	261	struct request_sock *req,
	262	struct sock *child);
1fd51155 JP	263	void inet_csk_reqsk_queue_hash_add(struct sock sk, struct request_sock req,
1fd51155 JP	264	unsigned long timeout);
5e0724d0 ED	265	struct sock inet_csk_complete_hashdance(struct sock sk, struct sock *child,
	266	struct request_sock *req,
	267	bool own_req);
3f421baa	268
2feda341	269	static inline void inet_csk_reqsk_queue_added(struct sock *sk)
3f421baa	270	{
fa76ce73	271	reqsk_queue_added(&inet_csk(sk)->icsk_accept_queue);
3f421baa ACM	272	}
	273
	274	static inline int inet_csk_reqsk_queue_len(const struct sock *sk)
	275	{
	276	return reqsk_queue_len(&inet_csk(sk)->icsk_accept_queue);
	277	}
	278
3f421baa ACM	279	static inline int inet_csk_reqsk_queue_is_full(const struct sock *sk)
3f421baa ACM	280	{
ef547f2a	281	return inet_csk_reqsk_queue_len(sk) >= sk->sk_max_ack_backlog;
3f421baa ACM	282	}
3f421baa ACM	283
b357a364	284	void inet_csk_reqsk_queue_drop(struct sock sk, struct request_sock req);
f03f2e15	285	void inet_csk_reqsk_queue_drop_and_put(struct sock sk, struct request_sock req);
3f421baa	286
2f8a397d PA	287	static inline void inet_csk_prepare_for_destroy_sock(struct sock *sk)
	288	{
	289	/* The below has to be done to allow calling inet_csk_destroy_sock */
	290	sock_set_flag(sk, SOCK_DEAD);
	291	percpu_counter_inc(sk->sk_prot->orphan_count);
2f8a397d PA	292	}
2f8a397d PA	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
62ffc589 TF	311	/* update the fast reuse flag when adding a socket */
	312	void inet_csk_update_fastreuse(struct inet_bind_bucket *tb,
	313	struct sock *sk);
	314
1fd51155	315	struct dst_entry inet_csk_update_pmtu(struct sock sk, u32 mtu);
31954cd8	316
4a41f453	317	#define TCP_PINGPONG_THRESH 3
31954cd8 WW	318
	319	static inline void inet_csk_enter_pingpong_mode(struct sock *sk)
	320	{
	321	inet_csk(sk)->icsk_ack.pingpong = TCP_PINGPONG_THRESH;
	322	}
	323
	324	static inline void inet_csk_exit_pingpong_mode(struct sock *sk)
	325	{
	326	inet_csk(sk)->icsk_ack.pingpong = 0;
	327	}
	328
	329	static inline bool inet_csk_in_pingpong_mode(struct sock *sk)
	330	{
	331	return inet_csk(sk)->icsk_ack.pingpong >= TCP_PINGPONG_THRESH;
	332	}
4a41f453 WW	333
	334	static inline void inet_csk_inc_pingpong_cnt(struct sock *sk)
	335	{
	336	struct inet_connection_sock *icsk = inet_csk(sk);
	337
	338	if (icsk->icsk_ack.pingpong < U8_MAX)
	339	icsk->icsk_ack.pingpong++;
	340	}
7b70973d LB	341
	342	static inline bool inet_csk_has_ulp(struct sock *sk)
	343	{
	344	return inet_sk(sk)->is_icsk && !!inet_csk(sk)->icsk_ulp_ops;
	345	}
	346
463c84b9	347	#endif /* _INET_CONNECTION_SOCK_H */