/* * 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 #include "msg.h" #include "node.h" /* TIPC-specific error codes */ #define ELINKCONG EAGAIN /* link congestion <=> resource unavailable */ /* Out-of-range value for link sequence numbers */ #define INVALID_LINK_SEQ 0x10000 /* 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_BC_ACK = (1 << 2) }; /* Starting value for maximum packet size negotiation on unicast links * (unless bearer MTU is less) */ #define MAX_PKT_DEFAULT 1500 struct tipc_stats { u32 sent_info; /* used in counting # sent packets */ u32 recv_info; /* used in counting # recv'd packets */ u32 sent_states; u32 recv_states; u32 sent_probes; u32 recv_probes; u32 sent_nacks; u32 recv_nacks; u32 sent_acks; u32 sent_bundled; u32 sent_bundles; u32 recv_bundled; u32 recv_bundles; u32 retransmitted; u32 sent_fragmented; u32 sent_fragments; u32 recv_fragmented; u32 recv_fragments; u32 link_congs; /* # port sends blocked by congestion */ u32 deferred_recv; u32 duplicates; u32 max_queue_sz; /* send queue size high water mark */ u32 accu_queue_sz; /* used for send queue size profiling */ u32 queue_sz_counts; /* used for send queue size profiling */ u32 msg_length_counts; /* used for message length profiling */ u32 msg_lengths_total; /* used for message length profiling */ u32 msg_length_profile[7]; /* used for msg. length profiling */ }; /** * struct tipc_link - TIPC link data structure * @addr: network address of link's peer node * @name: link name character string * @media_addr: media address to use when sending messages over link * @timer: link timer * @net: pointer to namespace struct * @refcnt: reference counter for permanent references (owner node & timer) * @peer_session: link session # being used by peer end of link * @peer_bearer_id: bearer id used by link's peer endpoint * @bearer_id: local bearer id used by link * @tolerance: minimum link continuity loss needed to reset link [in ms] * @keepalive_intv: link keepalive timer interval * @abort_limit: # of unacknowledged continuity probes needed to reset link * @state: current state of link FSM * @peer_caps: bitmap describing capabilities of peer node * @silent_intv_cnt: # of timer intervals without any reception from peer * @proto_msg: template for control messages generated by link * @pmsg: convenience pointer to "proto_msg" field * @priority: current link priority * @net_plane: current link network plane ('A' through 'H') * @backlog_limit: backlog queue congestion thresholds (indexed by importance) * @exp_msg_count: # of tunnelled messages expected during link changeover * @reset_rcv_checkpt: seq # of last acknowledged message at time of link reset * @mtu: current maximum packet size for this link * @advertised_mtu: advertised own mtu when link is being established * @transmitq: queue for sent, non-acked messages * @backlogq: queue for messages waiting to be sent * @snt_nxt: next sequence number to use for outbound messages * @last_retransmitted: sequence number of most recently retransmitted message * @stale_count: # of identical retransmit requests made by peer * @ackers: # of peers that needs to ack each packet before it can be released * @acked: # last packet acked by a certain peer. Used for broadcast. * @rcv_nxt: next sequence number to expect for inbound messages * @deferred_queue: deferred queue saved OOS b'cast message received from node * @unacked_window: # of inbound messages rx'd without ack'ing back to peer * @inputq: buffer queue for messages to be delivered upwards * @namedq: buffer queue for name table messages to be delivered upwards * @next_out: ptr to first unsent outbound message in queue * @wakeupq: linked list of wakeup msgs waiting for link congestion to abate * @long_msg_seq_no: next identifier to use for outbound fragmented messages * @reasm_buf: head of partially reassembled inbound message fragments * @bc_rcvr: marks that this is a broadcast receiver link * @stats: collects statistics regarding link activity */ struct tipc_link { u32 addr; char name[TIPC_MAX_LINK_NAME]; struct tipc_media_addr *media_addr; struct net *net; /* Management and link supervision data */ u32 peer_session; u32 peer_bearer_id; u32 bearer_id; u32 tolerance; unsigned long keepalive_intv; u32 abort_limit; u32 state; u16 peer_caps; bool active; u32 silent_intv_cnt; struct { unchar hdr[INT_H_SIZE]; unchar body[TIPC_MAX_IF_NAME]; } proto_msg; struct tipc_msg *pmsg; u32 priority; char net_plane; /* Failover/synch */ u16 drop_point; struct sk_buff *failover_reasm_skb; /* Max packet negotiation */ u16 mtu; u16 advertised_mtu; /* Sending */ struct sk_buff_head transmq; struct sk_buff_head backlogq; struct { u16 len; u16 limit; } backlog[5]; u16 snd_nxt; u16 last_retransm; u16 window; u32 stale_count; /* Reception */ u16 rcv_nxt; u32 rcv_unacked; struct sk_buff_head deferdq; struct sk_buff_head *inputq; struct sk_buff_head *namedq; /* Congestion handling */ struct sk_buff_head wakeupq; /* Fragmentation/reassembly */ struct sk_buff *reasm_buf; /* Broadcast */ u16 ackers; u16 acked; struct tipc_link *bc_rcvlink; struct tipc_link *bc_sndlink; int nack_state; bool bc_peer_is_up; /* Statistics */ struct tipc_stats stats; }; bool tipc_link_create(struct net *net, char *if_name, int bearer_id, int tolerance, char net_plane, u32 mtu, int priority, int window, u32 session, u32 ownnode, u32 peer, 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, int mtu, int window, 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_build_reset_msg(struct tipc_link *l, struct sk_buff_head *xmitq); int tipc_link_fsm_evt(struct tipc_link *l, int evt); void tipc_link_reset_fragments(struct tipc_link *l_ptr); 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_ptr); int tipc_link_xmit(struct tipc_link *link, struct sk_buff_head *list, struct sk_buff_head *xmitq); void tipc_link_set_queue_limits(struct tipc_link *l, u32 window); int tipc_nl_link_dump(struct sk_buff *skb, struct netlink_callback *cb); int tipc_nl_link_get(struct sk_buff *skb, struct genl_info *info); int tipc_nl_link_set(struct sk_buff *skb, struct genl_info *info); int tipc_nl_link_reset_stats(struct sk_buff *skb, struct genl_info *info); 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_ack_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); void tipc_link_bc_ack_rcv(struct tipc_link *l, u16 acked, struct sk_buff_head *xmitq); 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); void 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); #endif