path: root/net/rxrpc/ar-internal.h

/* AF_RXRPC internal definitions
 *
 * Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
 * Written by David Howells (dhowells@redhat.com)
 *
 * 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.
 */

#include <linux/atomic.h>
#include <linux/seqlock.h>
#include <net/net_namespace.h>
#include <net/netns/generic.h>
#include <net/sock.h>
#include <net/af_rxrpc.h>
#include "protocol.h"

#if 0
#define CHECK_SLAB_OKAY(X)				     \
	BUG_ON(atomic_read((X)) >> (sizeof(atomic_t) - 2) == \
	       (POISON_FREE << 8 | POISON_FREE))
#else
#define CHECK_SLAB_OKAY(X) do {} while (0)
#endif

#define FCRYPT_BSIZE 8
struct rxrpc_crypt {
	union {
		u8	x[FCRYPT_BSIZE];
		__be32	n[2];
	};
} __attribute__((aligned(8)));

#define rxrpc_queue_work(WS)	queue_work(rxrpc_workqueue, (WS))
#define rxrpc_queue_delayed_work(WS,D)	\
	queue_delayed_work(rxrpc_workqueue, (WS), (D))

struct rxrpc_connection;

/*
 * Mark applied to socket buffers in skb->mark.  skb->priority is used
 * to pass supplementary information.
 */
enum rxrpc_skb_mark {
	RXRPC_SKB_MARK_REJECT_BUSY,	/* Reject with BUSY */
	RXRPC_SKB_MARK_REJECT_ABORT,	/* Reject with ABORT (code in skb->priority) */
};

/*
 * sk_state for RxRPC sockets
 */
enum {
	RXRPC_UNBOUND = 0,
	RXRPC_CLIENT_UNBOUND,		/* Unbound socket used as client */
	RXRPC_CLIENT_BOUND,		/* client local address bound */
	RXRPC_SERVER_BOUND,		/* server local address bound */
	RXRPC_SERVER_BOUND2,		/* second server local address bound */
	RXRPC_SERVER_LISTENING,		/* server listening for connections */
	RXRPC_SERVER_LISTEN_DISABLED,	/* server listening disabled */
	RXRPC_CLOSE,			/* socket is being closed */
};

/*
 * Per-network namespace data.
 */
struct rxrpc_net {
	struct proc_dir_entry	*proc_net;	/* Subdir in /proc/net */
	u32			epoch;		/* Local epoch for detecting local-end reset */
	struct list_head	calls;		/* List of calls active in this namespace */
	rwlock_t		call_lock;	/* Lock for ->calls */
	atomic_t		nr_calls;	/* Count of allocated calls */

	atomic_t		nr_conns;
	struct list_head	conn_proc_list;	/* List of conns in this namespace for proc */
	struct list_head	service_conns;	/* Service conns in this namespace */
	rwlock_t		conn_lock;	/* Lock for ->conn_proc_list, ->service_conns */
	struct work_struct	service_conn_reaper;
	struct timer_list	service_conn_reap_timer;

	unsigned int		nr_client_conns;
	unsigned int		nr_active_client_conns;
	bool			kill_all_client_conns;
	bool			live;
	spinlock_t		client_conn_cache_lock; /* Lock for ->*_client_conns */
	spinlock_t		client_conn_discard_lock; /* Prevent multiple discarders */
	struct list_head	waiting_client_conns;
	struct list_head	active_client_conns;
	struct list_head	idle_client_conns;
	struct work_struct	client_conn_reaper;
	struct timer_list	client_conn_reap_timer;

	struct list_head	local_endpoints;
	struct mutex		local_mutex;	/* Lock for ->local_endpoints */

	DECLARE_HASHTABLE	(peer_hash, 10);
	spinlock_t		peer_hash_lock;	/* Lock for ->peer_hash */

#define RXRPC_KEEPALIVE_TIME 20 /* NAT keepalive time in seconds */
	u8			peer_keepalive_cursor;
	time64_t		peer_keepalive_base;
	struct list_head	peer_keepalive[32];
	struct list_head	peer_keepalive_new;
	struct timer_list	peer_keepalive_timer;
	struct work_struct	peer_keepalive_work;
};

/*
 * Service backlog preallocation.
 *
 * This contains circular buffers of preallocated peers, connections and calls
 * for incoming service calls and their head and tail pointers.  This allows
 * calls to be set up in the data_ready handler, thereby avoiding the need to
 * shuffle packets around so much.
 */
struct rxrpc_backlog {
	unsigned short		peer_backlog_head;
	unsigned short		peer_backlog_tail;
	unsigned short		conn_backlog_head;
	unsigned short		conn_backlog_tail;
	unsigned short		call_backlog_head;
	unsigned short		call_backlog_tail;
#define RXRPC_BACKLOG_MAX	32
	struct rxrpc_peer	*peer_backlog[RXRPC_BACKLOG_MAX];
	struct rxrpc_connection	*conn_backlog[RXRPC_BACKLOG_MAX];
	struct rxrpc_call	*call_backlog[RXRPC_BACKLOG_MAX];
};

/*
 * RxRPC socket definition
 */
struct rxrpc_sock {
	/* WARNING: sk has to be the first member */
	struct sock		sk;
	rxrpc_notify_new_call_t	notify_new_call; /* Func to notify of new call */
	rxrpc_discard_new_call_t discard_new_call; /* Func to discard a new call */
	struct rxrpc_local	*local;		/* local endpoint */
	struct rxrpc_backlog	*backlog;