[mirror_ubuntu-zesty-kernel.git] / 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)(struct sock *sk, struct sk_buff *skb,
				      struct request_sock *req,
				      struct dst_entry *dst);
	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:7,
				  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_ca_priv[16];
	u32			  icsk_user_timeout;
#define ICSK_CA_PRIV_SIZE	(16 * sizeof(u32))
};

#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;
}

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
};

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;
}

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);

#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
}

/*
 *	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
}

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);

struct request_sock *inet_csk_search_req(const struct sock *sk,
					 struct request_sock ***prevp,
					 const __be16 rport,
					 const __be32 raddr,
					 const __be32 laddr);
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(struct sock *sk, struct flowi4 *fl4,
				     const struct request_sock *req);
struct dst_entry *inet_csk_route_child_sock(struct sock *sk, struct sock *newsk,
					    const struct request_sock *req);

static inline void inet_csk_reqsk_queue_add(struct sock *sk,
					    struct request_sock *req,
					    struct sock *child)
{
	reqsk_queue_add(&inet_csk(sk)->icsk_accept_queue, req, sk, child);
}

void inet_csk_reqsk_queue_hash_add(struct sock *sk, struct request_sock *req,
				   unsigned long timeout);

static inline void inet_csk_reqsk_queue_removed(struct sock *sk,
						struct request_sock *req)
{
	if (reqsk_queue_removed(&inet_csk(sk)->icsk_accept_queue, req) == 0)
		inet_csk_delete_keepalive_timer(sk);
}

static inline void inet_csk_reqsk_queue_added(struct sock *sk,
					      const unsigned long timeout)
{
	if (reqsk_queue_added(&inet_csk(sk)->icsk_accept_queue) == 0)
		inet_csk_reset_keepalive_timer(sk, timeout);
}

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_young(const struct sock *sk)
{
	return reqsk_queue_len_young(&inet_csk(sk)->icsk_accept_queue);
}

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

static inline void inet_csk_reqsk_queue_unlink(struct sock *sk,
					       struct request_sock *req,
					       struct request_sock **prev)
{
	reqsk_queue_unlink(&inet_csk(sk)->icsk_accept_queue, req, prev);
}

static inline void inet_csk_reqsk_queue_drop(struct sock *sk,
					     struct request_sock *req,
					     struct request_sock **prev)
{
	inet_csk_reqsk_queue_unlink(sk, req, prev);
	inet_csk_reqsk_queue_removed(sk, req);
	reqsk_free(req);
}

void inet_csk_reqsk_queue_prune(struct sock *parent,
				const unsigned long interval,
				const unsigned long timeout,
				const unsigned long max_rto);

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;
}

int inet_csk_listen_start(struct sock *sk, const int nr_table_entries);
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 */
Commit	Line	Data
463c84b9 ACM	1	/*
	2	* NET Generic infrastructure for INET connection oriented protocols.
	3	*
	4	* Definitions for inet_connection_sock
	5	*
	6	* Authors: Many people, see the TCP sources
	7	*
	8	* From code originally in TCP
	9	*
	10	* This program is free software; you can redistribute it and/or
	11	* modify it under the terms of the GNU General Public License
	12	* as published by the Free Software Foundation; either version
	13	* 2 of the License, or (at your option) any later version.
	14	*/
	15	#ifndef _INET_CONNECTION_SOCK_H
	16	#define _INET_CONNECTION_SOCK_H
	17
8292a17a	18	#include <linux/compiler.h>
3f421baa	19	#include <linux/string.h>
463c84b9	20	#include <linux/timer.h>
bd01f843	21	#include <linux/poll.h>
14c85021 ACM	22
14c85021 ACM	23	#include <net/inet_sock.h>
463c84b9 ACM	24	#include <net/request_sock.h>
463c84b9 ACM	25
3f421baa ACM	26	#define INET_CSK_DEBUG 1
	27
	28	/* Cancel timers, when they are not required. */
	29	#undef INET_CSK_CLEAR_TIMERS
	30
463c84b9	31	struct inet_bind_bucket;
6687e988	32	struct tcp_congestion_ops;
463c84b9	33
8292a17a ACM	34	/*
	35	* Pointers to address related TCP functions
	36	* (i.e. things that depend on the address family)
	37	*/
	38	struct inet_connection_sock_af_ops {
b0270e91	39	int (queue_xmit)(struct sock sk, struct sk_buff skb, struct flowi fl);
bb296246	40	void (send_check)(struct sock sk, struct sk_buff *skb);
8292a17a	41	int (rebuild_header)(struct sock sk);
5d299f3d	42	void (sk_rx_dst_set)(struct sock sk, const struct sk_buff *skb);
8292a17a ACM	43	int (conn_request)(struct sock sk, struct sk_buff *skb);
	44	struct sock (syn_recv_sock)(struct sock sk, struct sk_buff skb,
	45	struct request_sock *req,
	46	struct dst_entry *dst);
850db6b8	47	u16 net_header_len;
67469601	48	u16 net_frag_header_len;
850db6b8	49	u16 sockaddr_len;
8292a17a	50	int (setsockopt)(struct sock sk, int level, int optname,
b7058842	51	char __user *optval, unsigned int optlen);
8292a17a ACM	52	int (getsockopt)(struct sock sk, int level, int optname,
8292a17a ACM	53	char __user optval, int __user optlen);
af01d537	54	#ifdef CONFIG_COMPAT
3fdadf7d DM	55	int (compat_setsockopt)(struct sock sk,
3fdadf7d DM	56	int level, int optname,
b7058842	57	char __user *optval, unsigned int optlen);
3fdadf7d DM	58	int (compat_getsockopt)(struct sock sk,
	59	int level, int optname,
	60	char __user optval, int __user optlen);
af01d537	61	#endif
8292a17a	62	void (addr2sockaddr)(struct sock sk, struct sockaddr *);
ab1e0a13	63	int (bind_conflict)(const struct sock sk,
aacd9289	64	const struct inet_bind_bucket *tb, bool relax);
4fab9071	65	void (mtu_reduced)(struct sock sk);
8292a17a ACM	66	};
8292a17a ACM	67
463c84b9 ACM	68	/** inet_connection_sock - INET connection oriented sock
	69	*
	70	* @icsk_accept_queue: FIFO of established children
	71	* @icsk_bind_hash: Bind node
	72	* @icsk_timeout: Timeout
	73	* @icsk_retransmit_timer: Resend (no ack)
	74	* @icsk_rto: Retransmit timeout
d83d8461	75	* @icsk_pmtu_cookie Last pmtu seen by socket
6687e988	76	* @icsk_ca_ops Pluggable congestion control hook
8292a17a	77	* @icsk_af_ops Operations which are AF_INET{4,6} specific
6687e988	78	* @icsk_ca_state: Congestion control state
463c84b9 ACM	79	* @icsk_retransmits: Number of unrecovered [RTO] timeouts
	80	* @icsk_pending: Scheduled timer event
	81	* @icsk_backoff: Backoff
	82	* @icsk_syn_retries: Number of allowed SYN (or equivalent) retries
6687e988	83	* @icsk_probes_out: unanswered 0 window probes
d83d8461	84	* @icsk_ext_hdr_len: Network protocol overhead (IP/IPv6 options)
463c84b9	85	* @icsk_ack: Delayed ACK control data
5d424d5a	86	* @icsk_mtup; MTU probing control data
463c84b9 ACM	87	*/
	88	struct inet_connection_sock {
	89	/* inet_sock has to be the first member! */
	90	struct inet_sock icsk_inet;
	91	struct request_sock_queue icsk_accept_queue;
	92	struct inet_bind_bucket *icsk_bind_hash;
	93	unsigned long icsk_timeout;
	94	struct timer_list icsk_retransmit_timer;
	95	struct timer_list icsk_delack_timer;
	96	__u32 icsk_rto;
d83d8461	97	__u32 icsk_pmtu_cookie;
770cfbcf SH	98	const struct tcp_congestion_ops *icsk_ca_ops;
770cfbcf SH	99	const struct inet_connection_sock_af_ops *icsk_af_ops;
d83d8461	100	unsigned int (icsk_sync_mss)(struct sock sk, u32 pmtu);
c5c6a8ab DB	101	__u8 icsk_ca_state:7,
c5c6a8ab DB	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 */
	113	__u8 blocked; /* Delayed ACK was blocked by socket lock */
	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 */
	118	__u16 rcv_mss; /* MSS used for delayed ACK decisions */
	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;
6687e988	132	u32 icsk_ca_priv[16];
dca43c75	133	u32 icsk_user_timeout;
6687e988	134	#define ICSK_CA_PRIV_SIZE (16 * sizeof(u32))
463c84b9 ACM	135	};
463c84b9 ACM	136
3f421baa ACM	137	#define ICSK_TIME_RETRANS 1 /* Retransmit timer */
	138	#define ICSK_TIME_DACK 2 /* Delayed ack timer */
	139	#define ICSK_TIME_PROBE0 3 /* Zero window probe timer */
6ba8a3b1 ND	140	#define ICSK_TIME_EARLY_RETRANS 4 /* Early retransmit timer */
6ba8a3b1 ND	141	#define ICSK_TIME_LOSS_PROBE 5 /* Tail loss probe timer */
3f421baa	142
463c84b9 ACM	143	static inline struct inet_connection_sock inet_csk(const struct sock sk)
	144	{
	145	return (struct inet_connection_sock *)sk;
	146	}
	147
6687e988 ACM	148	static inline void inet_csk_ca(const struct sock sk)
	149	{
	150	return (void *)inet_csk(sk)->icsk_ca_priv;
	151	}
	152
1fd51155 JP	153	struct sock inet_csk_clone_lock(const struct sock sk,
	154	const struct request_sock *req,
	155	const gfp_t priority);
9f1d2604	156
3f421baa ACM	157	enum inet_csk_ack_state_t {
	158	ICSK_ACK_SCHED = 1,
	159	ICSK_ACK_TIMER = 2,
1ef9696c AK	160	ICSK_ACK_PUSHED = 4,
1ef9696c AK	161	ICSK_ACK_PUSHED2 = 8
3f421baa ACM	162	};
3f421baa ACM	163
1fd51155 JP	164	void inet_csk_init_xmit_timers(struct sock *sk,
	165	void (*retransmit_handler)(unsigned long),
	166	void (*delack_handler)(unsigned long),
	167	void (*keepalive_handler)(unsigned long));
	168	void inet_csk_clear_xmit_timers(struct sock *sk);
463c84b9	169
3f421baa ACM	170	static inline void inet_csk_schedule_ack(struct sock *sk)
	171	{
	172	inet_csk(sk)->icsk_ack.pending \|= ICSK_ACK_SCHED;
	173	}
	174
	175	static inline int inet_csk_ack_scheduled(const struct sock *sk)
	176	{
	177	return inet_csk(sk)->icsk_ack.pending & ICSK_ACK_SCHED;
	178	}
	179
	180	static inline void inet_csk_delack_init(struct sock *sk)
	181	{
	182	memset(&inet_csk(sk)->icsk_ack, 0, sizeof(inet_csk(sk)->icsk_ack));
	183	}
	184
1fd51155 JP	185	void inet_csk_delete_keepalive_timer(struct sock *sk);
1fd51155 JP	186	void inet_csk_reset_keepalive_timer(struct sock *sk, unsigned long timeout);
3f421baa ACM	187
	188	#ifdef INET_CSK_DEBUG
	189	extern const char inet_csk_timer_bug_msg[];
	190	#endif
	191
	192	static inline void inet_csk_clear_xmit_timer(struct sock *sk, const int what)
	193	{
	194	struct inet_connection_sock *icsk = inet_csk(sk);
	195
	196	if (what == ICSK_TIME_RETRANS \|\| what == ICSK_TIME_PROBE0) {
	197	icsk->icsk_pending = 0;
	198	#ifdef INET_CSK_CLEAR_TIMERS
	199	sk_stop_timer(sk, &icsk->icsk_retransmit_timer);
	200	#endif
	201	} else if (what == ICSK_TIME_DACK) {
	202	icsk->icsk_ack.blocked = icsk->icsk_ack.pending = 0;
	203	#ifdef INET_CSK_CLEAR_TIMERS
	204	sk_stop_timer(sk, &icsk->icsk_delack_timer);
	205	#endif
	206	}
	207	#ifdef INET_CSK_DEBUG
	208	else {
d8971fcb	209	pr_debug("%s", inet_csk_timer_bug_msg);
3f421baa ACM	210	}
	211	#endif
	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) {
	224	#ifdef INET_CSK_DEBUG
	225	pr_debug("reset_xmit_timer: sk=%p %d when=0x%lx, caller=%p\n",
	226	sk, what, when, current_text_addr());
	227	#endif
	228	when = max_when;
	229	}
	230
6ba8a3b1 ND	231	if (what == ICSK_TIME_RETRANS \|\| what == ICSK_TIME_PROBE0 \|\|
6ba8a3b1 ND	232	what == ICSK_TIME_EARLY_RETRANS \|\| what == ICSK_TIME_LOSS_PROBE) {
3f421baa ACM	233	icsk->icsk_pending = what;
	234	icsk->icsk_timeout = jiffies + when;
	235	sk_reset_timer(sk, &icsk->icsk_retransmit_timer, icsk->icsk_timeout);
	236	} else if (what == ICSK_TIME_DACK) {
	237	icsk->icsk_ack.pending \|= ICSK_ACK_TIMER;
	238	icsk->icsk_ack.timeout = jiffies + when;
	239	sk_reset_timer(sk, &icsk->icsk_delack_timer, icsk->icsk_ack.timeout);
	240	}
	241	#ifdef INET_CSK_DEBUG
	242	else {
d8971fcb	243	pr_debug("%s", inet_csk_timer_bug_msg);
3f421baa ACM	244	}
	245	#endif
	246	}
	247
fcdd1cf4 ED	248	static inline unsigned long
	249	inet_csk_rto_backoff(const struct inet_connection_sock *icsk,
	250	unsigned long max_when)
	251	{
	252	u64 when = (u64)icsk->icsk_rto << icsk->icsk_backoff;
	253
	254	return (unsigned long)min_t(u64, when, max_when);
	255	}
	256
1fd51155	257	struct sock inet_csk_accept(struct sock sk, int flags, int *err);
3f421baa	258
1fd51155 JP	259	struct request_sock inet_csk_search_req(const struct sock sk,
	260	struct request_sock ***prevp,
	261	const __be16 rport,
	262	const __be32 raddr,
	263	const __be32 laddr);
	264	int inet_csk_bind_conflict(const struct sock *sk,
	265	const struct inet_bind_bucket *tb, bool relax);
	266	int inet_csk_get_port(struct sock *sk, unsigned short snum);
463c84b9	267
1fd51155 JP	268	struct dst_entry inet_csk_route_req(struct sock sk, struct flowi4 *fl4,
	269	const struct request_sock *req);
	270	struct dst_entry inet_csk_route_child_sock(struct sock sk, struct sock *newsk,
ba3f7f04	271	const struct request_sock *req);
463c84b9	272
3f421baa ACM	273	static inline void inet_csk_reqsk_queue_add(struct sock *sk,
	274	struct request_sock *req,
	275	struct sock *child)
	276	{
	277	reqsk_queue_add(&inet_csk(sk)->icsk_accept_queue, req, sk, child);
	278	}
	279
1fd51155 JP	280	void inet_csk_reqsk_queue_hash_add(struct sock sk, struct request_sock req,
1fd51155 JP	281	unsigned long timeout);
3f421baa ACM	282
	283	static inline void inet_csk_reqsk_queue_removed(struct sock *sk,
	284	struct request_sock *req)
	285	{
	286	if (reqsk_queue_removed(&inet_csk(sk)->icsk_accept_queue, req) == 0)
	287	inet_csk_delete_keepalive_timer(sk);
	288	}
	289
	290	static inline void inet_csk_reqsk_queue_added(struct sock *sk,
	291	const unsigned long timeout)
	292	{
	293	if (reqsk_queue_added(&inet_csk(sk)->icsk_accept_queue) == 0)
	294	inet_csk_reset_keepalive_timer(sk, timeout);
	295	}
	296
	297	static inline int inet_csk_reqsk_queue_len(const struct sock *sk)
	298	{
	299	return reqsk_queue_len(&inet_csk(sk)->icsk_accept_queue);
	300	}
	301
	302	static inline int inet_csk_reqsk_queue_young(const struct sock *sk)
	303	{
	304	return reqsk_queue_len_young(&inet_csk(sk)->icsk_accept_queue);
	305	}
	306
	307	static inline int inet_csk_reqsk_queue_is_full(const struct sock *sk)
	308	{
	309	return reqsk_queue_is_full(&inet_csk(sk)->icsk_accept_queue);
	310	}
	311
	312	static inline void inet_csk_reqsk_queue_unlink(struct sock *sk,
	313	struct request_sock *req,
	314	struct request_sock **prev)
	315	{
	316	reqsk_queue_unlink(&inet_csk(sk)->icsk_accept_queue, req, prev);
	317	}
	318
	319	static inline void inet_csk_reqsk_queue_drop(struct sock *sk,
	320	struct request_sock *req,
	321	struct request_sock **prev)
	322	{
	323	inet_csk_reqsk_queue_unlink(sk, req, prev);
	324	inet_csk_reqsk_queue_removed(sk, req);
	325	reqsk_free(req);
	326	}
	327
1fd51155 JP	328	void inet_csk_reqsk_queue_prune(struct sock *parent,
	329	const unsigned long interval,
	330	const unsigned long timeout,
	331	const unsigned long max_rto);
a019d6fe	332
1fd51155 JP	333	void inet_csk_destroy_sock(struct sock *sk);
1fd51155 JP	334	void inet_csk_prepare_forced_close(struct sock *sk);
dc40c7bc ACM	335
	336	/*
	337	* LISTEN is a special case for poll..
	338	*/
	339	static inline unsigned int inet_csk_listen_poll(const struct sock *sk)
	340	{
	341	return !reqsk_queue_empty(&inet_csk(sk)->icsk_accept_queue) ?
	342	(POLLIN \| POLLRDNORM) : 0;
	343	}
	344
1fd51155 JP	345	int inet_csk_listen_start(struct sock *sk, const int nr_table_entries);
1fd51155 JP	346	void inet_csk_listen_stop(struct sock *sk);
295f7324	347
1fd51155	348	void inet_csk_addr2sockaddr(struct sock sk, struct sockaddr uaddr);
af05dc93	349
1fd51155 JP	350	int inet_csk_compat_getsockopt(struct sock *sk, int level, int optname,
	351	char __user optval, int __user optlen);
	352	int inet_csk_compat_setsockopt(struct sock *sk, int level, int optname,
	353	char __user *optval, unsigned int optlen);
80d0a69f	354
1fd51155	355	struct dst_entry inet_csk_update_pmtu(struct sock sk, u32 mtu);
463c84b9	356	#endif /* _INET_CONNECTION_SOCK_H */