Release 4.7 include/net/request_sock.h

/*
 * NET          Generic infrastructure for Network protocols.
 *
 *              Definitions for request_sock 
 *
 * Authors:     Arnaldo Carvalho de Melo <acme@conectiva.com.br>
 *
 *              From code originally in include/net/tcp.h
 *
 *              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 _REQUEST_SOCK_H

#define _REQUEST_SOCK_H

#include <linux/slab.h>
#include <linux/spinlock.h>
#include <linux/types.h>
#include <linux/bug.h>

#include <net/sock.h>

struct request_sock;
struct sk_buff;
struct dst_entry;
struct proto;


struct request_sock_ops {
	
int		family;
	
int		obj_size;
	
struct kmem_cache	*slab;
	
char		*slab_name;
	
int		(*rtx_syn_ack)(const struct sock *sk,
				       struct request_sock *req);
	
void		(*send_ack)(const struct sock *sk, struct sk_buff *skb,
				    struct request_sock *req);
	
void		(*send_reset)(const struct sock *sk,
				      struct sk_buff *skb);
	
void		(*destructor)(struct request_sock *req);
	
void		(*syn_ack_timeout)(const struct request_sock *req);
};

int inet_rtx_syn_ack(const struct sock *parent, struct request_sock *req);

/* struct request_sock - mini sock to represent a connection request
 */

struct request_sock {
	
struct sock_common		__req_common;

#define rsk_refcnt			__req_common.skc_refcnt

#define rsk_hash			__req_common.skc_hash

#define rsk_listener			__req_common.skc_listener

#define rsk_window_clamp		__req_common.skc_window_clamp

#define rsk_rcv_wnd			__req_common.skc_rcv_wnd

	
struct request_sock		*dl_next;
	
u16				mss;
	
u8				num_retrans; /* number of retransmits */
	
u8				cookie_ts:1; /* syncookie: encode tcpopts in timestamp */
	
u8				num_timeout:7; /* number of timeouts */
	
u32				ts_recent;
	
struct timer_list		rsk_timer;
	
const struct request_sock_ops	*rsk_ops;
	
struct sock			*sk;
	
u32				*saved_syn;
	
u32				secid;
	
u32				peer_secid;
};



static inline struct request_sock *inet_reqsk(const struct sock *sk)
{
	return (struct request_sock *)sk;
}

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static inline struct sock *req_to_sk(struct request_sock *req)
{
	return (struct sock *)req;
}

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static inline struct request_sock *

reqsk_alloc(const struct request_sock_ops *ops, struct sock *sk_listener,
	    bool attach_listener)
{
	struct request_sock *req;

	req = kmem_cache_alloc(ops->slab, GFP_ATOMIC | __GFP_NOWARN);
	if (!req)
		return NULL;
	req->rsk_listener = NULL;
	if (attach_listener) {
		if (unlikely(!atomic_inc_not_zero(&sk_listener->sk_refcnt))) {
			kmem_cache_free(ops->slab, req);
			return NULL;
		}
		req->rsk_listener = sk_listener;
	}
	req->rsk_ops = ops;
	req_to_sk(req)->sk_prot = sk_listener->sk_prot;
	sk_node_init(&req_to_sk(req)->sk_node);
	sk_tx_queue_clear(req_to_sk(req));
	req->saved_syn = NULL;
	atomic_set(&req->rsk_refcnt, 0);

	return req;
}

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static inline void reqsk_free(struct request_sock *req)
{
	/* temporary debugging */
	WARN_ON_ONCE(atomic_read(&req->rsk_refcnt) != 0);

	req->rsk_ops->destructor(req);
	if (req->rsk_listener)
		sock_put(req->rsk_listener);
	kfree(req->saved_syn);
	kmem_cache_free(req->rsk_ops->slab, req);
}

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static inline void reqsk_put(struct request_sock *req)
{
	if (atomic_dec_and_test(&req->rsk_refcnt))
		reqsk_free(req);
}

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extern int sysctl_max_syn_backlog;

/*
 * For a TCP Fast Open listener -
 *      lock - protects the access to all the reqsk, which is co-owned by
 *              the listener and the child socket.
 *      qlen - pending TFO requests (still in TCP_SYN_RECV).
 *      max_qlen - max TFO reqs allowed before TFO is disabled.
 *
 *      XXX (TFO) - ideally these fields can be made as part of "listen_sock"
 *      structure above. But there is some implementation difficulty due to
 *      listen_sock being part of request_sock_queue hence will be freed when
 *      a listener is stopped. But TFO related fields may continue to be
 *      accessed even after a listener is closed, until its sk_refcnt drops
 *      to 0 implying no more outstanding TFO reqs. One solution is to keep
 *      listen_opt around until sk_refcnt drops to 0. But there is some other
 *      complexity that needs to be resolved. E.g., a listener can be disabled
 *      temporarily through shutdown()->tcp_disconnect(), and re-enabled later.
 */

struct fastopen_queue {
	
struct request_sock	*rskq_rst_head; /* Keep track of past TFO */
	
struct request_sock	*rskq_rst_tail; /* requests that caused RST.
                                                 * This is part of the defense
                                                 * against spoofing attack.
                                                 */
	
spinlock_t	lock;
	
int		qlen;		/* # of pending (TCP_SYN_RECV) reqs */
	
int		max_qlen;	/* != 0 iff TFO is currently enabled */
};

/** struct request_sock_queue - queue of request_socks
 *
 * @rskq_accept_head - FIFO head of established children
 * @rskq_accept_tail - FIFO tail of established children
 * @rskq_defer_accept - User waits for some data after accept()
 *
 */

struct request_sock_queue {
	
spinlock_t		rskq_lock;
	
u8			rskq_defer_accept;

	
u32			synflood_warned;
	
atomic_t		qlen;
	
atomic_t		young;

	
struct request_sock	*rskq_accept_head;
	
struct request_sock	*rskq_accept_tail;
	
struct fastopen_queue	fastopenq;  /* Check max_qlen != 0 to determine
                                             * if TFO is enabled.
                                             */
};

void reqsk_queue_alloc(struct request_sock_queue *queue);

void reqsk_fastopen_remove(struct sock *sk, struct request_sock *req,
			   bool reset);



static inline bool reqsk_queue_empty(const struct request_sock_queue *queue)
{
	return queue->rskq_accept_head == NULL;
}

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static inline struct request_sock *reqsk_queue_remove(struct request_sock_queue *queue,
						      struct sock *parent)
{
	struct request_sock *req;

	spin_lock_bh(&queue->rskq_lock);
	req = queue->rskq_accept_head;
	if (req) {
		sk_acceptq_removed(parent);
		queue->rskq_accept_head = req->dl_next;
		if (queue->rskq_accept_head == NULL)
			queue->rskq_accept_tail = NULL;
	}
	spin_unlock_bh(&queue->rskq_lock);
	return req;
}

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static inline void reqsk_queue_removed(struct request_sock_queue *queue,
				       const struct request_sock *req)
{
	if (req->num_timeout == 0)
		atomic_dec(&queue->young);
	atomic_dec(&queue->qlen);
}

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static inline void reqsk_queue_added(struct request_sock_queue *queue)
{
	atomic_inc(&queue->young);
	atomic_inc(&queue->qlen);
}

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static inline int reqsk_queue_len(const struct request_sock_queue *queue)
{
	return atomic_read(&queue->qlen);
}

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static inline int reqsk_queue_len_young(const struct request_sock_queue *queue)
{
	return atomic_read(&queue->young);
}

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#endif /* _REQUEST_SOCK_H */
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