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 
23 struct 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 
36 typedef int (o2net_msg_handler_func)(struct o2net_msg *msg, u32 len, void *data,
37 				     void **ret_data);
38 typedef 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.... */
o2net_link_down(int err,struct socket * sock)52 static 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 
77 enum {
78 	O2NET_DRIVER_UNINITED,
79 	O2NET_DRIVER_READY,
80 };
81 
82 int o2net_send_message(u32 msg_type, u32 key, void *data, u32 len,
83 		       u8 target_node, int *status);
84 int o2net_send_message_vec(u32 msg_type, u32 key, struct kvec *vec,
85 			   size_t veclen, u8 target_node, int *status);
86 
87 int 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);
91 void o2net_unregister_handler_list(struct list_head *list);
92 
93 void o2net_fill_node_map(unsigned long *map, unsigned bytes);
94 
95 struct o2nm_node;
96 int o2net_register_hb_callbacks(void);
97 void o2net_unregister_hb_callbacks(void);
98 int o2net_start_listening(struct o2nm_node *node);
99 void o2net_stop_listening(struct o2nm_node *node);
100 void o2net_disconnect_node(struct o2nm_node *node);
101 int o2net_num_connected_peers(void);
102 
103 int o2net_init(void);
104 void o2net_exit(void);
105 
106 struct o2net_send_tracking;
107 struct o2net_sock_container;
108 
109 #ifdef CONFIG_DEBUG_FS
110 void o2net_debugfs_init(void);
111 void o2net_debugfs_exit(void);
112 void o2net_debug_add_nst(struct o2net_send_tracking *nst);
113 void o2net_debug_del_nst(struct o2net_send_tracking *nst);
114 void o2net_debug_add_sc(struct o2net_sock_container *sc);
115 void o2net_debug_del_sc(struct o2net_sock_container *sc);
116 #else
o2net_debugfs_init(void)117 static inline void o2net_debugfs_init(void)
118 {
119 }
o2net_debugfs_exit(void)120 static inline void o2net_debugfs_exit(void)
121 {
122 }
o2net_debug_add_nst(struct o2net_send_tracking * nst)123 static inline void o2net_debug_add_nst(struct o2net_send_tracking *nst)
124 {
125 }
o2net_debug_del_nst(struct o2net_send_tracking * nst)126 static inline void o2net_debug_del_nst(struct o2net_send_tracking *nst)
127 {
128 }
o2net_debug_add_sc(struct o2net_sock_container * sc)129 static inline void o2net_debug_add_sc(struct o2net_sock_container *sc)
130 {
131 }
o2net_debug_del_sc(struct o2net_sock_container * sc)132 static 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