/* * net/tipc/node.h: Include file for TIPC node management routines * * Copyright (c) 2000-2006, 2014-2015, Ericsson AB * Copyright (c) 2005, 2010-2014, Wind River Systems * All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions are met: * * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. Neither the names of the copyright holders nor the names of its * contributors may be used to endorse or promote products derived from * this software without specific prior written permission. * * Alternatively, this software may be distributed under the terms of the * GNU General Public License ("GPL") version 2 as published by the Free * Software Foundation. * * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE * POSSIBILITY OF SUCH DAMAGE. */ #ifndef _TIPC_NODE_H #define _TIPC_NODE_H #include "addr.h" #include "net.h" #include "bearer.h" #include "msg.h" /* Out-of-range value for node signature */ #define INVALID_NODE_SIG 0x10000 /* Flags used to take different actions according to flag type * TIPC_WAIT_PEER_LINKS_DOWN: wait to see that peer's links are down * TIPC_WAIT_OWN_LINKS_DOWN: wait until peer node is declared down * TIPC_NOTIFY_NODE_DOWN: notify node is down * TIPC_NOTIFY_NODE_UP: notify node is up * TIPC_DISTRIBUTE_NAME: publish or withdraw link state name type */ enum { TIPC_MSG_EVT = 1, TIPC_WAIT_PEER_LINKS_DOWN = (1 << 1), TIPC_WAIT_OWN_LINKS_DOWN = (1 << 2), TIPC_NOTIFY_NODE_DOWN = (1 << 3), TIPC_NOTIFY_NODE_UP = (1 << 4), TIPC_WAKEUP_BCAST_USERS = (1 << 5), TIPC_NOTIFY_LINK_UP = (1 << 6), TIPC_NOTIFY_LINK_DOWN = (1 << 7), TIPC_NAMED_MSG_EVT = (1 << 8), TIPC_BCAST_MSG_EVT = (1 << 9), TIPC_BCAST_RESET = (1 << 10) }; /** * struct tipc_node_bclink - TIPC node bclink structure * @acked: sequence # of last outbound b'cast message acknowledged by node * @last_in: sequence # of last in-sequence b'cast message received from node * @last_sent: sequence # of last b'cast message sent by node * @oos_state: state tracker for handling OOS b'cast messages * @deferred_queue: deferred queue saved OOS b'cast message received from node * @reasm_buf: broadcast reassembly queue head from node * @inputq_map: bitmap indicating which inqueues should be kicked * @recv_permitted: true if node is allowed to receive b'cast messages */ struct tipc_node_bclink { u32 acked; u32 last_in; u32 last_sent; u32 oos_state; u32 deferred_size; struct sk_buff_head deferdq; struct sk_buff *reasm_buf; int inputq_map; bool recv_permitted; }; struct tipc_link_entry { struct tipc_link *link; u32 mtu; }; /** * struct tipc_node - TIPC node structure * @addr: network address of node * @ref: reference counter to node object * @lock: spinlock governing access to structure * @net: the applicable net namespace * @hash: links to adjacent nodes in unsorted hash chain * @inputq: pointer to input queue containing messages for msg event * @namedq: pointer to name table input queue with name table messages * @active_links: pointer into links[] array, identifying which links are active * @links: array containing references to all links to node * @action_flags: bit mask of different types of node actions * @bclink: broadcast-related info * @list: links to adjacent nodes in sorted list of cluster's nodes * @working_links: number of working links to node (both active and standby) * @link_cnt: number of links to node * @capabilities: bitmap, indicating peer node's functional capabilities * @signature: node instance identifier * @link_id: local and remote bearer ids of changing link, if any * @publ_list: list of publications * @rcu: rcu struct for tipc_node */ struct tipc_node { u32 addr; struct kref kref; spinlock_t lock; struct net *net; struct hlist_node hash; struct sk_buff_head *inputq; struct sk_buff_head *namedq; struct tipc_link_entry *active_links[2]; struct tipc_link_entry links[MAX_BEARERS]; int action_flags; struct tipc_node_bclink bclink; struct list_head list; int link_cnt; u16 working_links; u16 capabilities; u32 signature; u32 link_id; struct list_head publ_list; struct list_head conn_sks; struct rcu_head rcu; }; struct tipc_node *tipc_node_find(struct net *net, u32 addr); void tipc_node_put(struct tipc_node *node); struct tipc_node *tipc_node_create(struct net *net, u32 addr); void tipc_node_stop(struct net *net); void tipc_node_attach_link(struct tipc_node *n_ptr, struct tipc_link *l_ptr); void tipc_node_detach_link(struct tipc_node *n_ptr, struct tipc_link *l_ptr); void tipc_node_link_down(struct tipc_node *n_ptr, int bearer_id); void tipc_node_link_up(struct tipc_node *n_ptr, int bearer_id); bool tipc_node_is_up(struct tipc_node *n); int tipc_node_get_linkname(struct net *net, u32 bearer_id, u32 node, char *linkname, size_t len); void tipc_node_unlock(struct tipc_node *node); int tipc_node_add_conn(struct net *net, u32 dnode, u32 port, u32 peer_port); void tipc_node_remove_conn(struct net *net, u32 dnode, u32 port); int tipc_nl_node_dump(struct sk_buff *skb, struct netlink_callback *cb); static inline void tipc_node_lock(struct tipc_node *node) { spin_lock_bh(&node->lock); } static inline bool tipc_node_blocked(struct tipc_node *node) { return (node->action_flags & (TIPC_WAIT_PEER_LINKS_DOWN | TIPC_NOTIFY_NODE_DOWN | TIPC_WAIT_OWN_LINKS_DOWN)); } static inline struct tipc_link *node_active_link(struct tipc_node *n, int sel) { struct tipc_link_entry *le = n->active_links[sel & 1]; if (likely(le)) return le->link; return NULL; } static inline uint tipc_node_get_mtu(struct net *net, u32 addr, u32 selector) { struct tipc_node *n; struct tipc_link_entry *le; unsigned int mtu = MAX_MSG_SIZE; n = tipc_node_find(net, addr); if (unlikely(!n)) return mtu; le = n->active_links[selector & 1]; if (likely(le)) mtu = le->mtu; tipc_node_put(n); return mtu; } #endif