net/tipc/link.h

   1 /*
   2  * net/tipc/link.h: Include file for TIPC link code
   3  *
   4  * Copyright (c) 1995-2006, 2013-2014, Ericsson AB
   5  * Copyright (c) 2004-2005, 2010-2011, Wind River Systems
   6  * All rights reserved.
   7  *
   8  * Redistribution and use in source and binary forms, with or without
   9  * modification, are permitted provided that the following conditions are met:
  10  *
  11  * 1. Redistributions of source code must retain the above copyright
  12  *    notice, this list of conditions and the following disclaimer.
  13  * 2. Redistributions in binary form must reproduce the above copyright
  14  *    notice, this list of conditions and the following disclaimer in the
  15  *    documentation and/or other materials provided with the distribution.
  16  * 3. Neither the names of the copyright holders nor the names of its
  17  *    contributors may be used to endorse or promote products derived from
  18  *    this software without specific prior written permission.
  19  *
  20  * Alternatively, this software may be distributed under the terms of the
  21  * GNU General Public License ("GPL") version 2 as published by the Free
  22  * Software Foundation.
  23  *
  24  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
  25  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  26  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  27  * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
  28  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  29  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  30  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  31  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  32  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  33  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  34  * POSSIBILITY OF SUCH DAMAGE.
  35  */
  36
  37 #ifndef _TIPC_LINK_H
  38 #define _TIPC_LINK_H
  39
  40 #include <net/genetlink.h>
  41 #include "msg.h"
  42 #include "node.h"
  43
  44 /* TIPC-specific error codes
  45 */
  46 #define ELINKCONG EAGAIN        /* link congestion <=> resource unavailable */
  47
  48 /* Link FSM events:
  49  */
  50 enum {
  51         LINK_ESTABLISH_EVT       = 0xec1ab1e,
  52         LINK_PEER_RESET_EVT      = 0x9eed0e,
  53         LINK_FAILURE_EVT         = 0xfa110e,
  54         LINK_RESET_EVT           = 0x10ca1d0e,
  55         LINK_FAILOVER_BEGIN_EVT  = 0xfa110bee,
  56         LINK_FAILOVER_END_EVT    = 0xfa110ede,
  57         LINK_SYNCH_BEGIN_EVT     = 0xc1ccbee,
  58         LINK_SYNCH_END_EVT       = 0xc1ccede
  59 };
  60
  61 /* Events returned from link at packet reception or at timeout
  62  */
  63 enum {
  64         TIPC_LINK_UP_EVT       = 1,
  65         TIPC_LINK_DOWN_EVT     = (1 << 1),
  66         TIPC_LINK_SND_STATE    = (1 << 2)
  67 };
  68
  69 /* Starting value for maximum packet size negotiation on unicast links
  70  * (unless bearer MTU is less)
  71  */
  72 #define MAX_PKT_DEFAULT 1500
  73
  74 bool tipc_link_create(struct net *net, char *if_name, int bearer_id,
  75                       int tolerance, char net_plane, u32 mtu, int priority,
  76                       u32 min_win, u32 max_win, u32 session, u32 ownnode,
  77                       u32 peer, u8 *peer_id, u16 peer_caps,
  78                       struct tipc_link *bc_sndlink,
  79                       struct tipc_link *bc_rcvlink,
  80                       struct sk_buff_head *inputq,
  81                       struct sk_buff_head *namedq,
  82                       struct tipc_link **link);
  83 bool tipc_link_bc_create(struct net *net, u32 ownnode, u32 peer, u8 *peer_id,
  84                          int mtu, u32 min_win, u32 max_win, u16 peer_caps,
  85                          struct sk_buff_head *inputq,
  86                          struct sk_buff_head *namedq,
  87                          struct tipc_link *bc_sndlink,
  88                          struct tipc_link **link);
  89 void tipc_link_tnl_prepare(struct tipc_link *l, struct tipc_link *tnl,
  90                            int mtyp, struct sk_buff_head *xmitq);
  91 void tipc_link_create_dummy_tnl_msg(struct tipc_link *tnl,
  92                                     struct sk_buff_head *xmitq);
  93 void tipc_link_failover_prepare(struct tipc_link *l, struct tipc_link *tnl,
  94                                 struct sk_buff_head *xmitq);
  95 void tipc_link_build_reset_msg(struct tipc_link *l, struct sk_buff_head *xmitq);
  96 int tipc_link_fsm_evt(struct tipc_link *l, int evt);
  97 bool tipc_link_is_up(struct tipc_link *l);
  98 bool tipc_link_peer_is_down(struct tipc_link *l);
  99 bool tipc_link_is_reset(struct tipc_link *l);
 100 bool tipc_link_is_establishing(struct tipc_link *l);
 101 bool tipc_link_is_synching(struct tipc_link *l);
 102 bool tipc_link_is_failingover(struct tipc_link *l);
 103 bool tipc_link_is_blocked(struct tipc_link *l);
 104 void tipc_link_set_active(struct tipc_link *l, bool active);
 105 void tipc_link_reset(struct tipc_link *l);
 106 void tipc_link_reset_stats(struct tipc_link *l);
 107 int tipc_link_xmit(struct tipc_link *link, struct sk_buff_head *list,
 108                    struct sk_buff_head *xmitq);
 109 struct sk_buff_head *tipc_link_inputq(struct tipc_link *l);
 110 u16 tipc_link_rcv_nxt(struct tipc_link *l);
 111 u16 tipc_link_acked(struct tipc_link *l);
 112 u32 tipc_link_id(struct tipc_link *l);
 113 char *tipc_link_name(struct tipc_link *l);
 114 u32 tipc_link_state(struct tipc_link *l);
 115 char tipc_link_plane(struct tipc_link *l);
 116 int tipc_link_prio(struct tipc_link *l);
 117 int tipc_link_min_win(struct tipc_link *l);
 118 int tipc_link_max_win(struct tipc_link *l);
 119 void tipc_link_update_caps(struct tipc_link *l, u16 capabilities);
 120 bool tipc_link_validate_msg(struct tipc_link *l, struct tipc_msg *hdr);
 121 unsigned long tipc_link_tolerance(struct tipc_link *l);
 122 void tipc_link_set_tolerance(struct tipc_link *l, u32 tol,
 123                              struct sk_buff_head *xmitq);
 124 void tipc_link_set_prio(struct tipc_link *l, u32 prio,
 125                         struct sk_buff_head *xmitq);
 126 void tipc_link_set_abort_limit(struct tipc_link *l, u32 limit);
 127 void tipc_link_set_queue_limits(struct tipc_link *l, u32 min_win, u32 max_win);
 128 int __tipc_nl_add_link(struct net *net, struct tipc_nl_msg *msg,
 129                        struct tipc_link *link, int nlflags);
 130 int tipc_nl_parse_link_prop(struct nlattr *prop, struct nlattr *props[]);
 131 int tipc_link_timeout(struct tipc_link *l, struct sk_buff_head *xmitq);
 132 int tipc_link_rcv(struct tipc_link *l, struct sk_buff *skb,
 133                   struct sk_buff_head *xmitq);
 134 int tipc_link_build_state_msg(struct tipc_link *l, struct sk_buff_head *xmitq);
 135 void tipc_link_add_bc_peer(struct tipc_link *snd_l,
 136                            struct tipc_link *uc_l,
 137                            struct sk_buff_head *xmitq);
 138 void tipc_link_remove_bc_peer(struct tipc_link *snd_l,
 139                               struct tipc_link *rcv_l,
 140                               struct sk_buff_head *xmitq);
 141 int tipc_link_bc_peers(struct tipc_link *l);
 142 void tipc_link_set_mtu(struct tipc_link *l, int mtu);
 143 int tipc_link_mtu(struct tipc_link *l);
 144 int tipc_link_mss(struct tipc_link *l);
 145 u16 tipc_get_gap_ack_blks(struct tipc_gap_ack_blks **ga, struct tipc_link *l,
 146                           struct tipc_msg *hdr, bool uc);
 147 int tipc_link_bc_ack_rcv(struct tipc_link *l, u16 acked, u16 gap,
 148                          struct tipc_gap_ack_blks *ga,
 149                          struct sk_buff_head *xmitq,
 150                          struct sk_buff_head *retrq);
 151 void tipc_link_build_bc_sync_msg(struct tipc_link *l,
 152                                  struct sk_buff_head *xmitq);
 153 void tipc_link_bc_init_rcv(struct tipc_link *l, struct tipc_msg *hdr);
 154 int tipc_link_bc_sync_rcv(struct tipc_link *l,   struct tipc_msg *hdr,
 155                           struct sk_buff_head *xmitq);
 156 int tipc_link_bc_nack_rcv(struct tipc_link *l, struct sk_buff *skb,
 157                           struct sk_buff_head *xmitq);
 158 bool tipc_link_too_silent(struct tipc_link *l);
 159 #endif