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+/*
+ * net/tipc/link.h: Include file for TIPC link code
+ *
+ * Copyright (c) 1995-2006, 2013-2014, Ericsson AB
+ * Copyright (c) 2004-2005, 2010-2011, 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_LINK_H
+#define _TIPC_LINK_H
+
+#include <net/genetlink.h>
+#include "msg.h"
+#include "node.h"
+
+/* TIPC-specific error codes
+*/
+#define ELINKCONG EAGAIN /* link congestion <=> resource unavailable */
+
+/* Link FSM events:
+ */
+enum {
+ LINK_ESTABLISH_EVT = 0xec1ab1e,
+ LINK_PEER_RESET_EVT = 0x9eed0e,
+ LINK_FAILURE_EVT = 0xfa110e,
+ LINK_RESET_EVT = 0x10ca1d0e,
+ LINK_FAILOVER_BEGIN_EVT = 0xfa110bee,
+ LINK_FAILOVER_END_EVT = 0xfa110ede,
+ LINK_SYNCH_BEGIN_EVT = 0xc1ccbee,
+ LINK_SYNCH_END_EVT = 0xc1ccede
+};
+
+/* Events returned from link at packet reception or at timeout
+ */
+enum {
+ TIPC_LINK_UP_EVT = 1,
+ TIPC_LINK_DOWN_EVT = (1 << 1),
+ TIPC_LINK_SND_STATE = (1 << 2)
+};
+
+/* Starting value for maximum packet size negotiation on unicast links
+ * (unless bearer MTU is less)
+ */
+#define MAX_PKT_DEFAULT 1500
+
+bool tipc_link_create(struct net *net, char *if_name, int bearer_id,
+ int tolerance, char net_plane, u32 mtu, int priority,
+ u32 min_win, u32 max_win, u32 session, u32 ownnode,
+ u32 peer, u8 *peer_id, u16 peer_caps,
+ struct tipc_link *bc_sndlink,
+ struct tipc_link *bc_rcvlink,
+ struct sk_buff_head *inputq,
+ struct sk_buff_head *namedq,
+ struct tipc_link **link);
+bool tipc_link_bc_create(struct net *net, u32 ownnode, u32 peer, u8 *peer_id,
+ int mtu, u32 min_win, u32 max_win, u16 peer_caps,
+ struct sk_buff_head *inputq,
+ struct sk_buff_head *namedq,
+ struct tipc_link *bc_sndlink,
+ struct tipc_link **link);
+void tipc_link_tnl_prepare(struct tipc_link *l, struct tipc_link *tnl,
+ int mtyp, struct sk_buff_head *xmitq);
+void tipc_link_create_dummy_tnl_msg(struct tipc_link *tnl,
+ struct sk_buff_head *xmitq);
+void tipc_link_failover_prepare(struct tipc_link *l, struct tipc_link *tnl,
+ struct sk_buff_head *xmitq);
+void tipc_link_build_reset_msg(struct tipc_link *l, struct sk_buff_head *xmitq);
+int tipc_link_fsm_evt(struct tipc_link *l, int evt);
+bool tipc_link_is_up(struct tipc_link *l);
+bool tipc_link_peer_is_down(struct tipc_link *l);
+bool tipc_link_is_reset(struct tipc_link *l);
+bool tipc_link_is_establishing(struct tipc_link *l);
+bool tipc_link_is_synching(struct tipc_link *l);
+bool tipc_link_is_failingover(struct tipc_link *l);
+bool tipc_link_is_blocked(struct tipc_link *l);
+void tipc_link_set_active(struct tipc_link *l, bool active);
+void tipc_link_reset(struct tipc_link *l);
+void tipc_link_reset_stats(struct tipc_link *l);
+int tipc_link_xmit(struct tipc_link *link, struct sk_buff_head *list,
+ struct sk_buff_head *xmitq);
+struct sk_buff_head *tipc_link_inputq(struct tipc_link *l);
+u16 tipc_link_rcv_nxt(struct tipc_link *l);
+u16 tipc_link_acked(struct tipc_link *l);
+u32 tipc_link_id(struct tipc_link *l);
+char *tipc_link_name(struct tipc_link *l);
+u32 tipc_link_state(struct tipc_link *l);
+char tipc_link_plane(struct tipc_link *l);
+int tipc_link_prio(struct tipc_link *l);
+int tipc_link_min_win(struct tipc_link *l);
+int tipc_link_max_win(struct tipc_link *l);
+void tipc_link_update_caps(struct tipc_link *l, u16 capabilities);
+bool tipc_link_validate_msg(struct tipc_link *l, struct tipc_msg *hdr);
+unsigned long tipc_link_tolerance(struct tipc_link *l);
+void tipc_link_set_tolerance(struct tipc_link *l, u32 tol,
+ struct sk_buff_head *xmitq);
+void tipc_link_set_prio(struct tipc_link *l, u32 prio,
+ struct sk_buff_head *xmitq);
+void tipc_link_set_abort_limit(struct tipc_link *l, u32 limit);
+void tipc_link_set_queue_limits(struct tipc_link *l, u32 min_win, u32 max_win);
+int __tipc_nl_add_link(struct net *net, struct tipc_nl_msg *msg,
+ struct tipc_link *link, int nlflags);
+int tipc_nl_parse_link_prop(struct nlattr *prop, struct nlattr *props[]);
+int tipc_link_timeout(struct tipc_link *l, struct sk_buff_head *xmitq);
+int tipc_link_rcv(struct tipc_link *l, struct sk_buff *skb,
+ struct sk_buff_head *xmitq);
+int tipc_link_build_state_msg(struct tipc_link *l, struct sk_buff_head *xmitq);
+void tipc_link_add_bc_peer(struct tipc_link *snd_l,
+ struct tipc_link *uc_l,
+ struct sk_buff_head *xmitq);
+void tipc_link_remove_bc_peer(struct tipc_link *snd_l,
+ struct tipc_link *rcv_l,
+ struct sk_buff_head *xmitq);
+int tipc_link_bc_peers(struct tipc_link *l);
+void tipc_link_set_mtu(struct tipc_link *l, int mtu);
+int tipc_link_mtu(struct tipc_link *l);
+int tipc_link_mss(struct tipc_link *l);
+u16 tipc_get_gap_ack_blks(struct tipc_gap_ack_blks **ga, struct tipc_link *l,
+ struct tipc_msg *hdr, bool uc);
+int tipc_link_bc_ack_rcv(struct tipc_link *l, u16 acked, u16 gap,
+ struct tipc_gap_ack_blks *ga,
+ struct sk_buff_head *xmitq,
+ struct sk_buff_head *retrq);
+void tipc_link_build_bc_sync_msg(struct tipc_link *l,
+ struct sk_buff_head *xmitq);
+void tipc_link_bc_init_rcv(struct tipc_link *l, struct tipc_msg *hdr);
+int tipc_link_bc_sync_rcv(struct tipc_link *l, struct tipc_msg *hdr,
+ struct sk_buff_head *xmitq);
+int tipc_link_bc_nack_rcv(struct tipc_link *l, struct sk_buff *skb,
+ struct sk_buff_head *xmitq);
+bool tipc_link_too_silent(struct tipc_link *l);
+struct net *tipc_link_net(struct tipc_link *l);
+#endif