[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
 * @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;
	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 {
		/* 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      (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_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 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
9d9b1ee0 EC	79	* @icsk_probes_tstamp: Probe timestamp (cleared by non-zero window ack)
9d9b1ee0 EC	80	* @icsk_user_timeout: TCP_USER_TIMEOUT value
463c84b9 ACM	81	*/
	82	struct inet_connection_sock {
	83	/* inet_sock has to be the first member! */
	84	struct inet_sock icsk_inet;
	85	struct request_sock_queue icsk_accept_queue;
	86	struct inet_bind_bucket *icsk_bind_hash;
	87	unsigned long icsk_timeout;
	88	struct timer_list icsk_retransmit_timer;
	89	struct timer_list icsk_delack_timer;
	90	__u32 icsk_rto;
ca584ba0	91	__u32 icsk_rto_min;
2b8ee4f0	92	__u32 icsk_delack_max;
d83d8461	93	__u32 icsk_pmtu_cookie;
770cfbcf SH	94	const struct tcp_congestion_ops *icsk_ca_ops;
770cfbcf SH	95	const struct inet_connection_sock_af_ops *icsk_af_ops;
734942cc	96	const struct tcp_ulp_ops *icsk_ulp_ops;
15a7dea7	97	void __rcu *icsk_ulp_data;
6dac1523	98	void (icsk_clean_acked)(struct sock sk, u32 acked_seq);
61b7c691	99	struct hlist_node icsk_listen_portaddr_node;
d83d8461	100	unsigned int (icsk_sync_mss)(struct sock sk, u32 pmtu);
8919a9b3 NC	101	__u8 icsk_ca_state:5,
8919a9b3 NC	102	icsk_ca_initialized:1,
9f950415	103	icsk_ca_setsockopt:1,
c5c6a8ab	104	icsk_ca_dst_locked:1;
463c84b9 ACM	105	__u8 icsk_retransmits;
	106	__u8 icsk_pending;
	107	__u8 icsk_backoff;
	108	__u8 icsk_syn_retries;
6687e988	109	__u8 icsk_probes_out;
d83d8461	110	__u16 icsk_ext_hdr_len;
463c84b9 ACM	111	struct {
	112	__u8 pending; /* ACK is pending */
	113	__u8 quick; /* Scheduled number of quick acks */
	114	__u8 pingpong; /* The session is interactive */
a37c2134	115	__u8 retry; /* Number of attempts */
463c84b9 ACM	116	__u32 ato; /* Predicted tick of soft clock */
	117	unsigned long timeout; /* Currently scheduled timeout */
	118	__u32 lrcvtime; /* timestamp of last received data packet */
	119	__u16 last_seg_size; /* Size of last incoming segment */
82695b30	120	__u16 rcv_mss; /* MSS used for delayed ACK decisions */
463c84b9	121	} icsk_ack;
5d424d5a	122	struct {
5d424d5a JH	123	/* Range of MTUs to search */
	124	int search_high;
	125	int search_low;
	126
	127	/* Information on the current probe. */
14e8e0f6 NC	128	u32 probe_size:31,
	129	/* Is the MTUP feature enabled for this connection? */
	130	enabled:1;
05cbc0db FD	131
05cbc0db FD	132	u32 probe_timestamp;
5d424d5a	133	} icsk_mtup;
9d9b1ee0	134	u32 icsk_probes_tstamp;
dca43c75	135	u32 icsk_user_timeout;
b5d721d7	136
78dc70eb PJ	137	u64 icsk_ca_priv[104 / sizeof(u64)];
78dc70eb PJ	138	#define ICSK_CA_PRIV_SIZE (13 * sizeof(u64))
463c84b9 ACM	139	};
463c84b9 ACM	140
3f421baa ACM	141	#define ICSK_TIME_RETRANS 1 /* Retransmit timer */
	142	#define ICSK_TIME_DACK 2 /* Delayed ack timer */
	143	#define ICSK_TIME_PROBE0 3 /* Zero window probe timer */
6ba8a3b1	144	#define ICSK_TIME_LOSS_PROBE 5 /* Tail loss probe timer */
57dde7f7	145	#define ICSK_TIME_REO_TIMEOUT 6 /* Reordering timer */
3f421baa	146
463c84b9 ACM	147	static inline struct inet_connection_sock inet_csk(const struct sock sk)
	148	{
	149	return (struct inet_connection_sock *)sk;
	150	}
	151
6687e988 ACM	152	static inline void inet_csk_ca(const struct sock sk)
	153	{
	154	return (void *)inet_csk(sk)->icsk_ca_priv;
	155	}
	156
1fd51155 JP	157	struct sock inet_csk_clone_lock(const struct sock sk,
	158	const struct request_sock *req,
	159	const gfp_t priority);
9f1d2604	160
3f421baa ACM	161	enum inet_csk_ack_state_t {
	162	ICSK_ACK_SCHED = 1,
	163	ICSK_ACK_TIMER = 2,
1ef9696c	164	ICSK_ACK_PUSHED = 4,
466466dc YC	165	ICSK_ACK_PUSHED2 = 8,
466466dc YC	166	ICSK_ACK_NOW = 16 /* Send the next ACK immediately (once) */
3f421baa ACM	167	};
3f421baa ACM	168
1fd51155	169	void inet_csk_init_xmit_timers(struct sock *sk,
59f379f9 KC	170	void (retransmit_handler)(struct timer_list ),
	171	void (delack_handler)(struct timer_list ),
	172	void (keepalive_handler)(struct timer_list ));
1fd51155	173	void inet_csk_clear_xmit_timers(struct sock *sk);
463c84b9	174
3f421baa ACM	175	static inline void inet_csk_schedule_ack(struct sock *sk)
	176	{
	177	inet_csk(sk)->icsk_ack.pending \|= ICSK_ACK_SCHED;
	178	}
	179
	180	static inline int inet_csk_ack_scheduled(const struct sock *sk)
	181	{
	182	return inet_csk(sk)->icsk_ack.pending & ICSK_ACK_SCHED;
	183	}
	184
	185	static inline void inet_csk_delack_init(struct sock *sk)
	186	{
	187	memset(&inet_csk(sk)->icsk_ack, 0, sizeof(inet_csk(sk)->icsk_ack));
	188	}
	189
1fd51155 JP	190	void inet_csk_delete_keepalive_timer(struct sock *sk);
1fd51155 JP	191	void inet_csk_reset_keepalive_timer(struct sock *sk, unsigned long timeout);
3f421baa	192
3f421baa ACM	193	static inline void inet_csk_clear_xmit_timer(struct sock *sk, const int what)
	194	{
	195	struct inet_connection_sock *icsk = inet_csk(sk);
82695b30	196
3f421baa ACM	197	if (what == ICSK_TIME_RETRANS \|\| what == ICSK_TIME_PROBE0) {
	198	icsk->icsk_pending = 0;
	199	#ifdef INET_CSK_CLEAR_TIMERS
	200	sk_stop_timer(sk, &icsk->icsk_retransmit_timer);
	201	#endif
	202	} else if (what == ICSK_TIME_DACK) {
b6b6d653	203	icsk->icsk_ack.pending = 0;
a37c2134	204	icsk->icsk_ack.retry = 0;
3f421baa ACM	205	#ifdef INET_CSK_CLEAR_TIMERS
	206	sk_stop_timer(sk, &icsk->icsk_delack_timer);
	207	#endif
03bdfc00 JP	208	} else {
03bdfc00 JP	209	pr_debug("inet_csk BUG: unknown timer value\n");
3f421baa	210	}
3f421baa ACM	211	}
	212
	213	/*
	214	* Reset the retransmission timer
	215	*/
	216	static inline void inet_csk_reset_xmit_timer(struct sock *sk, const int what,
	217	unsigned long when,
	218	const unsigned long max_when)
	219	{
	220	struct inet_connection_sock *icsk = inet_csk(sk);
	221
	222	if (when > max_when) {
3f421baa	223	pr_debug("reset_xmit_timer: sk=%p %d when=0x%lx, caller=%p\n",
96d18d82	224	sk, what, when, (void *)_THIS_IP_);
3f421baa ACM	225	when = max_when;
	226	}
	227
6ba8a3b1	228	if (what == ICSK_TIME_RETRANS \|\| what == ICSK_TIME_PROBE0 \|\|
a05a7280	229	what == ICSK_TIME_LOSS_PROBE \|\| what == ICSK_TIME_REO_TIMEOUT) {
3f421baa ACM	230	icsk->icsk_pending = what;
	231	icsk->icsk_timeout = jiffies + when;
	232	sk_reset_timer(sk, &icsk->icsk_retransmit_timer, icsk->icsk_timeout);
	233	} else if (what == ICSK_TIME_DACK) {
	234	icsk->icsk_ack.pending \|= ICSK_ACK_TIMER;
	235	icsk->icsk_ack.timeout = jiffies + when;
	236	sk_reset_timer(sk, &icsk->icsk_delack_timer, icsk->icsk_ack.timeout);
03bdfc00 JP	237	} else {
03bdfc00 JP	238	pr_debug("inet_csk BUG: unknown timer value\n");
3f421baa	239	}
3f421baa ACM	240	}
3f421baa ACM	241
fcdd1cf4 ED	242	static inline unsigned long
	243	inet_csk_rto_backoff(const struct inet_connection_sock *icsk,
	244	unsigned long max_when)
	245	{
	246	u64 when = (u64)icsk->icsk_rto << icsk->icsk_backoff;
	247
	248	return (unsigned long)min_t(u64, when, max_when);
	249	}
	250
cdfbabfb	251	struct sock inet_csk_accept(struct sock sk, int flags, int *err, bool kern);
3f421baa	252
1fd51155	253	int inet_csk_get_port(struct sock *sk, unsigned short snum);
463c84b9	254
e5895bc6	255	struct dst_entry inet_csk_route_req(const struct sock sk, struct flowi4 *fl4,
1fd51155	256	const struct request_sock *req);
a2432c4f ED	257	struct dst_entry inet_csk_route_child_sock(const struct sock sk,
a2432c4f ED	258	struct sock *newsk,
ba3f7f04	259	const struct request_sock *req);
463c84b9	260
7716682c ED	261	struct sock inet_csk_reqsk_queue_add(struct sock sk,
	262	struct request_sock *req,
	263	struct sock *child);
1fd51155 JP	264	void inet_csk_reqsk_queue_hash_add(struct sock sk, struct request_sock req,
1fd51155 JP	265	unsigned long timeout);
5e0724d0 ED	266	struct sock inet_csk_complete_hashdance(struct sock sk, struct sock *child,
	267	struct request_sock *req,
	268	bool own_req);
3f421baa	269
2feda341	270	static inline void inet_csk_reqsk_queue_added(struct sock *sk)
3f421baa	271	{
fa76ce73	272	reqsk_queue_added(&inet_csk(sk)->icsk_accept_queue);
3f421baa ACM	273	}
	274
	275	static inline int inet_csk_reqsk_queue_len(const struct sock *sk)
	276	{
	277	return reqsk_queue_len(&inet_csk(sk)->icsk_accept_queue);
	278	}
	279
3f421baa ACM	280	static inline int inet_csk_reqsk_queue_is_full(const struct sock *sk)
3f421baa ACM	281	{
ef547f2a	282	return inet_csk_reqsk_queue_len(sk) >= sk->sk_max_ack_backlog;
3f421baa ACM	283	}
3f421baa ACM	284
7233da86	285	bool inet_csk_reqsk_queue_drop(struct sock sk, struct request_sock req);
f03f2e15	286	void inet_csk_reqsk_queue_drop_and_put(struct sock sk, struct request_sock req);
3f421baa	287
2f8a397d PA	288	static inline void inet_csk_prepare_for_destroy_sock(struct sock *sk)
	289	{
	290	/* The below has to be done to allow calling inet_csk_destroy_sock */
	291	sock_set_flag(sk, SOCK_DEAD);
	292	percpu_counter_inc(sk->sk_prot->orphan_count);
2f8a397d PA	293	}
2f8a397d PA	294
1fd51155 JP	295	void inet_csk_destroy_sock(struct sock *sk);
1fd51155 JP	296	void inet_csk_prepare_forced_close(struct sock *sk);
dc40c7bc ACM	297
	298	/*
	299	* LISTEN is a special case for poll..
	300	*/
ade994f4	301	static inline __poll_t inet_csk_listen_poll(const struct sock *sk)
dc40c7bc ACM	302	{
dc40c7bc ACM	303	return !reqsk_queue_empty(&inet_csk(sk)->icsk_accept_queue) ?
a9a08845	304	(EPOLLIN \| EPOLLRDNORM) : 0;
dc40c7bc ACM	305	}
dc40c7bc ACM	306
f985c65c	307	int inet_csk_listen_start(struct sock *sk, int backlog);
1fd51155	308	void inet_csk_listen_stop(struct sock *sk);
295f7324	309
1fd51155	310	void inet_csk_addr2sockaddr(struct sock sk, struct sockaddr uaddr);
af05dc93	311
62ffc589 TF	312	/* update the fast reuse flag when adding a socket */
	313	void inet_csk_update_fastreuse(struct inet_bind_bucket *tb,
	314	struct sock *sk);
	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	}
7b70973d LB	342
	343	static inline bool inet_csk_has_ulp(struct sock *sk)
	344	{
	345	return inet_sk(sk)->is_icsk && !!inet_csk(sk)->icsk_ulp_ops;
	346	}
	347
463c84b9	348	#endif /* _INET_CONNECTION_SOCK_H */