Release 4.7 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 <net/inet_sock.h>
#include <net/request_sock.h>


#define INET_CSK_DEBUG 1

/* 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 *);
	
int	    (*bind_conflict)(const struct sock *sk,
				     const struct inet_bind_bucket *tb, bool relax);
	
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_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;
	
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[64 / sizeof(u64)];

#define ICSK_CA_PRIV_SIZE      (8 * 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 */



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

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

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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
};

void inet_csk_init_xmit_timers(struct sock *sk,
			       void (*retransmit_handler)(unsigned long),
			       void (*delack_handler)(unsigned long),
			       void (*keepalive_handler)(unsigned long));
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;
}

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

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

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

#ifdef INET_CSK_DEBUG
extern const char inet_csk_timer_bug_msg[];
#endif



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
	}
#ifdef INET_CSK_DEBUG
	else {
		pr_debug("%s", inet_csk_timer_bug_msg);
	}
#endif
}

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/*
 *      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) {
#ifdef INET_CSK_DEBUG
		pr_debug("reset_xmit_timer: sk=%p %d when=0x%lx, caller=%p\n",
			 sk, what, when, current_text_addr());
#endif
		when = max_when;
	}

	if (what == ICSK_TIME_RETRANS || what == ICSK_TIME_PROBE0 ||
	    what == ICSK_TIME_EARLY_RETRANS || what ==  ICSK_TIME_LOSS_PROBE) {
		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);
	}
#ifdef INET_CSK_DEBUG
	else {
		pr_debug("%s", inet_csk_timer_bug_msg);
	}
#endif
}

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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);
}

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

int inet_csk_bind_conflict(const struct sock *sk,
			   const struct inet_bind_bucket *tb, bool relax);
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);
}

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

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

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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;
}

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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 unsigned int inet_csk_listen_poll(const struct sock *sk)
{
	return !reqsk_queue_empty(&inet_csk(sk)->icsk_accept_queue) ?
			(POLLIN | POLLRDNORM) : 0;
}

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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);
#endif /* _INET_CONNECTION_SOCK_H */
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