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
40 struct 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
53 typedef int (o2net_msg_handler_func)(struct o2net_msg *msg, u32 len, void *data,
54 void **ret_data);
55 typedef 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 2000
64 #define O2NET_IDLE_TIMEOUT_MS_DEFAULT 30000
65
66
67 /* TODO: figure this out.... */
68 static 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
93 enum {
94 O2NET_DRIVER_UNINITED,
95 O2NET_DRIVER_READY,
96 };
97
98 int o2net_send_message(u32 msg_type, u32 key, void *data, u32 len,
99 u8 target_node, int *status);
100 int o2net_send_message_vec(u32 msg_type, u32 key, struct kvec *vec,
101 size_t veclen, u8 target_node, int *status);
102
103 int 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);
107 void o2net_unregister_handler_list(struct list_head *list);
108
109 struct o2nm_node;
110 int o2net_register_hb_callbacks(void);
111 void o2net_unregister_hb_callbacks(void);
112 int o2net_start_listening(struct o2nm_node *node);
113 void o2net_stop_listening(struct o2nm_node *node);
114 void o2net_disconnect_node(struct o2nm_node *node);
115 int o2net_num_connected_peers(void);
116
117 int o2net_init(void);
118 void o2net_exit(void);
119
120 #endif /* O2CLUSTER_TCP_H */
121
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