inet_connection_sock.h | Explore in Territory

/* 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 { … };

/** 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 { … };

#define ICSK_TIME_RETRANS …
#define ICSK_TIME_DACK …
#define ICSK_TIME_PROBE0 …
#define ICSK_TIME_LOSS_PROBE …
#define ICSK_TIME_REO_TIMEOUT …

#define inet_csk(ptr) …

static inline void *inet_csk_ca(const struct sock *sk)
{ … }

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 { … };

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);
void inet_csk_clear_xmit_timers_sync(struct sock *sk);

static inline void inet_csk_schedule_ack(struct sock *sk)
{ … }

static inline int inet_csk_ack_scheduled(const struct sock *sk)
{ … }

static inline void inet_csk_delack_init(struct sock *sk)
{ … }

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)
{ … }

/*
 *	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)
{ … }

static inline unsigned long
inet_csk_rto_backoff(const struct inet_connection_sock *icsk,
		     unsigned long max_when)
{ … }

struct sock *inet_csk_accept(struct sock *sk, struct proto_accept_arg *arg);

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);
bool 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)
{ … }

static inline int inet_csk_reqsk_queue_len(const struct sock *sk)
{ … }

static inline int inet_csk_reqsk_queue_is_full(const struct sock *sk)
{ … }

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)
{ … }

static inline void inet_csk_prepare_for_destroy_sock(struct sock *sk)
{ … }

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)
{ … }

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);

static inline void inet_csk_enter_pingpong_mode(struct sock *sk)
{ … }

static inline void inet_csk_exit_pingpong_mode(struct sock *sk)
{ … }

static inline bool inet_csk_in_pingpong_mode(struct sock *sk)
{ … }

static inline void inet_csk_inc_pingpong_cnt(struct sock *sk)
{ … }

static inline bool inet_csk_has_ulp(const struct sock *sk)
{ … }

static inline void inet_init_csk_locks(struct sock *sk)
{ … }

#endif /* _INET_CONNECTION_SOCK_H */
linux/include/net/inet_connection_sock.h
