1/* -*- mode: c; c-basic-offset: 8; -*-
2 * vim: noexpandtab sw=8 ts=8 sts=0:
3 *
4 * tcp.h
5 *
6 * Function prototypes
7 *
8 * Copyright (C) 2004 Oracle.  All rights reserved.
9 *
10 * This program is free software; you can redistribute it and/or
11 * modify it under the terms of the GNU General Public
12 * License as published by the Free Software Foundation; either
13 * version 2 of the License, or (at your option) any later version.
14 *
15 * This program is distributed in the hope that it will be useful,
16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
18 * General Public License for more details.
19 *
20 * You should have received a copy of the GNU General Public
21 * License along with this program; if not, write to the
22 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
23 * Boston, MA 021110-1307, USA.
24 *
25 */
26
27#ifndef O2CLUSTER_TCP_H
28#define O2CLUSTER_TCP_H
29
30#include <linux/socket.h>
31#ifdef __KERNEL__
32#include <net/sock.h>
33#include <linux/tcp.h>
34#else
35#include <sys/socket.h>
36#endif
37#include <linux/inet.h>
38#include <linux/in.h>
39
40struct o2net_msg
41{
42	__be16 magic;
43	__be16 data_len;
44	__be16 msg_type;
45	__be16 pad1;
46	__be32 sys_status;
47	__be32 status;
48	__be32 key;
49	__be32 msg_num;
50	__u8  buf[0];
51};
52
53typedef int (o2net_msg_handler_func)(struct o2net_msg *msg, u32 len, void *data,
54				     void **ret_data);
55typedef void (o2net_post_msg_handler_func)(int status, void *data,
56					   void *ret_data);
57
58#define O2NET_MAX_PAYLOAD_BYTES  (4096 - sizeof(struct o2net_msg))
59
60/* same as hb delay, we're waiting for another node to recognize our hb */
61#define O2NET_RECONNECT_DELAY_MS_DEFAULT	2000
62
63#define O2NET_KEEPALIVE_DELAY_MS_DEFAULT	5000
64#define O2NET_IDLE_TIMEOUT_MS_DEFAULT		10000
65
66
67/* TODO: figure this out.... */
68static inline int o2net_link_down(int err, struct socket *sock)
69{
70	if (sock) {
71		if (sock->sk->sk_state != TCP_ESTABLISHED &&
72	    	    sock->sk->sk_state != TCP_CLOSE_WAIT)
73			return 1;
74	}
75
76	if (err >= 0)
77		return 0;
78	switch (err) {
79		/* ????????????????????????? */
80		case -ERESTARTSYS:
81		case -EBADF:
82		/* When the server has died, an ICMP port unreachable
83		 * message prompts ECONNREFUSED. */
84		case -ECONNREFUSED:
85		case -ENOTCONN:
86		case -ECONNRESET:
87		case -EPIPE:
88			return 1;
89	}
90	return 0;
91}
92
93enum {
94	O2NET_DRIVER_UNINITED,
95	O2NET_DRIVER_READY,
96};
97
98int o2net_send_message(u32 msg_type, u32 key, void *data, u32 len,
99		       u8 target_node, int *status);
100int o2net_send_message_vec(u32 msg_type, u32 key, struct kvec *vec,
101			   size_t veclen, u8 target_node, int *status);
102
103int o2net_register_handler(u32 msg_type, u32 key, u32 max_len,
104			   o2net_msg_handler_func *func, void *data,
105			   o2net_post_msg_handler_func *post_func,
106			   struct list_head *unreg_list);
107void o2net_unregister_handler_list(struct list_head *list);
108
109struct o2nm_node;
110int o2net_register_hb_callbacks(void);
111void o2net_unregister_hb_callbacks(void);
112int o2net_start_listening(struct o2nm_node *node);
113void o2net_stop_listening(struct o2nm_node *node);
114void o2net_disconnect_node(struct o2nm_node *node);
115int o2net_num_connected_peers(void);
116
117int o2net_init(void);
118void o2net_exit(void);
119
120#endif /* O2CLUSTER_TCP_H */
121