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 struct o2net_send_tracking; 121 struct o2net_sock_container; 122 123 #ifdef CONFIG_DEBUG_FS 124 int o2net_debugfs_init(void); 125 void o2net_debugfs_exit(void); 126 void o2net_debug_add_nst(struct o2net_send_tracking *nst); 127 void o2net_debug_del_nst(struct o2net_send_tracking *nst); 128 void o2net_debug_add_sc(struct o2net_sock_container *sc); 129 void o2net_debug_del_sc(struct o2net_sock_container *sc); 130 #else 131 static inline int o2net_debugfs_init(void) 132 { 133 return 0; 134 } 135 static inline void o2net_debugfs_exit(void) 136 { 137 } 138 static inline void o2net_debug_add_nst(struct o2net_send_tracking *nst) 139 { 140 } 141 static inline void o2net_debug_del_nst(struct o2net_send_tracking *nst) 142 { 143 } 144 static inline void o2net_debug_add_sc(struct o2net_sock_container *sc) 145 { 146 } 147 static inline void o2net_debug_del_sc(struct o2net_sock_container *sc) 148 { 149 } 150 #endif /* CONFIG_DEBUG_FS */ 151 152 #endif /* O2CLUSTER_TCP_H */ 153