1/* SPDX-License-Identifier: GPL-2.0-or-later */
2/*
3 * tcp.h
4 *
5 * Function prototypes
6 *
7 * Copyright (C) 2004 Oracle.  All rights reserved.
8 */
9
10#ifndef O2CLUSTER_TCP_H
11#define O2CLUSTER_TCP_H
12
13#include <linux/socket.h>
14#ifdef __KERNEL__
15#include <net/sock.h>
16#include <linux/tcp.h>
17#else
18#include <sys/socket.h>
19#endif
20#include <linux/inet.h>
21#include <linux/in.h>
22
23struct o2net_msg
24{
25	__be16 magic;
26	__be16 data_len;
27	__be16 msg_type;
28	__be16 pad1;
29	__be32 sys_status;
30	__be32 status;
31	__be32 key;
32	__be32 msg_num;
33	__u8  buf[];
34};
35
36typedef int (o2net_msg_handler_func)(struct o2net_msg *msg, u32 len, void *data,
37				     void **ret_data);
38typedef void (o2net_post_msg_handler_func)(int status, void *data,
39					   void *ret_data);
40
41#define O2NET_MAX_PAYLOAD_BYTES  (4096 - sizeof(struct o2net_msg))
42
43/* same as hb delay, we're waiting for another node to recognize our hb */
44#define O2NET_RECONNECT_DELAY_MS_DEFAULT	2000
45
46#define O2NET_KEEPALIVE_DELAY_MS_DEFAULT	2000
47#define O2NET_IDLE_TIMEOUT_MS_DEFAULT		30000
48
49#define O2NET_TCP_USER_TIMEOUT			0x7fffffff
50
51/* TODO: figure this out.... */
52static inline int o2net_link_down(int err, struct socket *sock)
53{
54	if (sock) {
55		if (sock->sk->sk_state != TCP_ESTABLISHED &&
56	    	    sock->sk->sk_state != TCP_CLOSE_WAIT)
57			return 1;
58	}
59
60	if (err >= 0)
61		return 0;
62	switch (err) {
63		/* ????????????????????????? */
64		case -ERESTARTSYS:
65		case -EBADF:
66		/* When the server has died, an ICMP port unreachable
67		 * message prompts ECONNREFUSED. */
68		case -ECONNREFUSED:
69		case -ENOTCONN:
70		case -ECONNRESET:
71		case -EPIPE:
72			return 1;
73	}
74	return 0;
75}
76
77enum {
78	O2NET_DRIVER_UNINITED,
79	O2NET_DRIVER_READY,
80};
81
82int o2net_send_message(u32 msg_type, u32 key, void *data, u32 len,
83		       u8 target_node, int *status);
84int o2net_send_message_vec(u32 msg_type, u32 key, struct kvec *vec,
85			   size_t veclen, u8 target_node, int *status);
86
87int o2net_register_handler(u32 msg_type, u32 key, u32 max_len,
88			   o2net_msg_handler_func *func, void *data,
89			   o2net_post_msg_handler_func *post_func,
90			   struct list_head *unreg_list);
91void o2net_unregister_handler_list(struct list_head *list);
92
93void o2net_fill_node_map(unsigned long *map, unsigned bytes);
94
95struct o2nm_node;
96int o2net_register_hb_callbacks(void);
97void o2net_unregister_hb_callbacks(void);
98int o2net_start_listening(struct o2nm_node *node);
99void o2net_stop_listening(struct o2nm_node *node);
100void o2net_disconnect_node(struct o2nm_node *node);
101int o2net_num_connected_peers(void);
102
103int o2net_init(void);
104void o2net_exit(void);
105
106struct o2net_send_tracking;
107struct o2net_sock_container;
108
109#ifdef CONFIG_DEBUG_FS
110void o2net_debugfs_init(void);
111void o2net_debugfs_exit(void);
112void o2net_debug_add_nst(struct o2net_send_tracking *nst);
113void o2net_debug_del_nst(struct o2net_send_tracking *nst);
114void o2net_debug_add_sc(struct o2net_sock_container *sc);
115void o2net_debug_del_sc(struct o2net_sock_container *sc);
116#else
117static inline void o2net_debugfs_init(void)
118{
119}
120static inline void o2net_debugfs_exit(void)
121{
122}
123static inline void o2net_debug_add_nst(struct o2net_send_tracking *nst)
124{
125}
126static inline void o2net_debug_del_nst(struct o2net_send_tracking *nst)
127{
128}
129static inline void o2net_debug_add_sc(struct o2net_sock_container *sc)
130{
131}
132static inline void o2net_debug_del_sc(struct o2net_sock_container *sc)
133{
134}
135#endif	/* CONFIG_DEBUG_FS */
136
137#endif /* O2CLUSTER_TCP_H */
138