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 55 #define O2NET_MAX_PAYLOAD_BYTES (4096 - sizeof(struct o2net_msg)) 56 57 /* same as hb delay, we're waiting for another node to recognize our hb */ 58 #define O2NET_RECONNECT_DELAY_MS_DEFAULT 2000 59 60 #define O2NET_KEEPALIVE_DELAY_MS_DEFAULT 5000 61 #define O2NET_IDLE_TIMEOUT_MS_DEFAULT 10000 62 63 64 /* TODO: figure this out.... */ 65 static inline int o2net_link_down(int err, struct socket *sock) 66 { 67 if (sock) { 68 if (sock->sk->sk_state != TCP_ESTABLISHED && 69 sock->sk->sk_state != TCP_CLOSE_WAIT) 70 return 1; 71 } 72 73 if (err >= 0) 74 return 0; 75 switch (err) { 76 /* ????????????????????????? */ 77 case -ERESTARTSYS: 78 case -EBADF: 79 /* When the server has died, an ICMP port unreachable 80 * message prompts ECONNREFUSED. */ 81 case -ECONNREFUSED: 82 case -ENOTCONN: 83 case -ECONNRESET: 84 case -EPIPE: 85 return 1; 86 } 87 return 0; 88 } 89 90 enum { 91 O2NET_DRIVER_UNINITED, 92 O2NET_DRIVER_READY, 93 }; 94 95 int o2net_send_message(u32 msg_type, u32 key, void *data, u32 len, 96 u8 target_node, int *status); 97 int o2net_send_message_vec(u32 msg_type, u32 key, struct kvec *vec, 98 size_t veclen, u8 target_node, int *status); 99 100 int o2net_register_handler(u32 msg_type, u32 key, u32 max_len, 101 o2net_msg_handler_func *func, void *data, 102 struct list_head *unreg_list); 103 void o2net_unregister_handler_list(struct list_head *list); 104 105 struct o2nm_node; 106 int o2net_register_hb_callbacks(void); 107 void o2net_unregister_hb_callbacks(void); 108 int o2net_start_listening(struct o2nm_node *node); 109 void o2net_stop_listening(struct o2nm_node *node); 110 void o2net_disconnect_node(struct o2nm_node *node); 111 int o2net_num_connected_peers(void); 112 113 int o2net_init(void); 114 void o2net_exit(void); 115 116 #endif /* O2CLUSTER_TCP_H */ 117