Per Liden | b97bf3f | 2006-01-02 19:04:38 +0100 | [diff] [blame] | 1 | /* |
| 2 | * net/tipc/link.c: TIPC link code |
YOSHIFUJI Hideaki | c430728 | 2007-02-09 23:25:21 +0900 | [diff] [blame] | 3 | * |
Jon Paul Maloy | e74a386 | 2016-03-03 14:23:21 -0500 | [diff] [blame^] | 4 | * Copyright (c) 1996-2007, 2012-2016, Ericsson AB |
Ying Xue | 198d73b | 2013-06-17 10:54:42 -0400 | [diff] [blame] | 5 | * Copyright (c) 2004-2007, 2010-2013, Wind River Systems |
Per Liden | b97bf3f | 2006-01-02 19:04:38 +0100 | [diff] [blame] | 6 | * All rights reserved. |
| 7 | * |
Per Liden | 9ea1fd3 | 2006-01-11 13:30:43 +0100 | [diff] [blame] | 8 | * Redistribution and use in source and binary forms, with or without |
Per Liden | b97bf3f | 2006-01-02 19:04:38 +0100 | [diff] [blame] | 9 | * modification, are permitted provided that the following conditions are met: |
| 10 | * |
Per Liden | 9ea1fd3 | 2006-01-11 13:30:43 +0100 | [diff] [blame] | 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. |
Per Liden | b97bf3f | 2006-01-02 19:04:38 +0100 | [diff] [blame] | 19 | * |
Per Liden | 9ea1fd3 | 2006-01-11 13:30:43 +0100 | [diff] [blame] | 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 |
Per Liden | b97bf3f | 2006-01-02 19:04:38 +0100 | [diff] [blame] | 34 | * POSSIBILITY OF SUCH DAMAGE. |
| 35 | */ |
| 36 | |
| 37 | #include "core.h" |
Jon Paul Maloy | e3eea1e | 2015-03-13 16:08:11 -0400 | [diff] [blame] | 38 | #include "subscr.h" |
Per Liden | b97bf3f | 2006-01-02 19:04:38 +0100 | [diff] [blame] | 39 | #include "link.h" |
Richard Alpe | 7be57fc | 2014-11-20 10:29:12 +0100 | [diff] [blame] | 40 | #include "bcast.h" |
Jon Paul Maloy | 9816f06 | 2014-05-14 05:39:15 -0400 | [diff] [blame] | 41 | #include "socket.h" |
Per Liden | b97bf3f | 2006-01-02 19:04:38 +0100 | [diff] [blame] | 42 | #include "name_distr.h" |
Per Liden | b97bf3f | 2006-01-02 19:04:38 +0100 | [diff] [blame] | 43 | #include "discover.h" |
Richard Alpe | 0655f6a | 2014-11-20 10:29:07 +0100 | [diff] [blame] | 44 | #include "netlink.h" |
Per Liden | b97bf3f | 2006-01-02 19:04:38 +0100 | [diff] [blame] | 45 | |
Ying Xue | 796c75d | 2013-06-17 10:54:48 -0400 | [diff] [blame] | 46 | #include <linux/pkt_sched.h> |
| 47 | |
Jon Paul Maloy | 38206d5 | 2015-11-19 14:30:46 -0500 | [diff] [blame] | 48 | struct tipc_stats { |
| 49 | u32 sent_info; /* used in counting # sent packets */ |
| 50 | u32 recv_info; /* used in counting # recv'd packets */ |
| 51 | u32 sent_states; |
| 52 | u32 recv_states; |
| 53 | u32 sent_probes; |
| 54 | u32 recv_probes; |
| 55 | u32 sent_nacks; |
| 56 | u32 recv_nacks; |
| 57 | u32 sent_acks; |
| 58 | u32 sent_bundled; |
| 59 | u32 sent_bundles; |
| 60 | u32 recv_bundled; |
| 61 | u32 recv_bundles; |
| 62 | u32 retransmitted; |
| 63 | u32 sent_fragmented; |
| 64 | u32 sent_fragments; |
| 65 | u32 recv_fragmented; |
| 66 | u32 recv_fragments; |
| 67 | u32 link_congs; /* # port sends blocked by congestion */ |
| 68 | u32 deferred_recv; |
| 69 | u32 duplicates; |
| 70 | u32 max_queue_sz; /* send queue size high water mark */ |
| 71 | u32 accu_queue_sz; /* used for send queue size profiling */ |
| 72 | u32 queue_sz_counts; /* used for send queue size profiling */ |
| 73 | u32 msg_length_counts; /* used for message length profiling */ |
| 74 | u32 msg_lengths_total; /* used for message length profiling */ |
| 75 | u32 msg_length_profile[7]; /* used for msg. length profiling */ |
| 76 | }; |
| 77 | |
| 78 | /** |
| 79 | * struct tipc_link - TIPC link data structure |
| 80 | * @addr: network address of link's peer node |
| 81 | * @name: link name character string |
| 82 | * @media_addr: media address to use when sending messages over link |
| 83 | * @timer: link timer |
| 84 | * @net: pointer to namespace struct |
| 85 | * @refcnt: reference counter for permanent references (owner node & timer) |
| 86 | * @peer_session: link session # being used by peer end of link |
| 87 | * @peer_bearer_id: bearer id used by link's peer endpoint |
| 88 | * @bearer_id: local bearer id used by link |
| 89 | * @tolerance: minimum link continuity loss needed to reset link [in ms] |
| 90 | * @keepalive_intv: link keepalive timer interval |
| 91 | * @abort_limit: # of unacknowledged continuity probes needed to reset link |
| 92 | * @state: current state of link FSM |
| 93 | * @peer_caps: bitmap describing capabilities of peer node |
| 94 | * @silent_intv_cnt: # of timer intervals without any reception from peer |
| 95 | * @proto_msg: template for control messages generated by link |
| 96 | * @pmsg: convenience pointer to "proto_msg" field |
| 97 | * @priority: current link priority |
| 98 | * @net_plane: current link network plane ('A' through 'H') |
| 99 | * @backlog_limit: backlog queue congestion thresholds (indexed by importance) |
| 100 | * @exp_msg_count: # of tunnelled messages expected during link changeover |
| 101 | * @reset_rcv_checkpt: seq # of last acknowledged message at time of link reset |
| 102 | * @mtu: current maximum packet size for this link |
| 103 | * @advertised_mtu: advertised own mtu when link is being established |
| 104 | * @transmitq: queue for sent, non-acked messages |
| 105 | * @backlogq: queue for messages waiting to be sent |
| 106 | * @snt_nxt: next sequence number to use for outbound messages |
| 107 | * @last_retransmitted: sequence number of most recently retransmitted message |
| 108 | * @stale_count: # of identical retransmit requests made by peer |
| 109 | * @ackers: # of peers that needs to ack each packet before it can be released |
| 110 | * @acked: # last packet acked by a certain peer. Used for broadcast. |
| 111 | * @rcv_nxt: next sequence number to expect for inbound messages |
| 112 | * @deferred_queue: deferred queue saved OOS b'cast message received from node |
| 113 | * @unacked_window: # of inbound messages rx'd without ack'ing back to peer |
| 114 | * @inputq: buffer queue for messages to be delivered upwards |
| 115 | * @namedq: buffer queue for name table messages to be delivered upwards |
| 116 | * @next_out: ptr to first unsent outbound message in queue |
| 117 | * @wakeupq: linked list of wakeup msgs waiting for link congestion to abate |
| 118 | * @long_msg_seq_no: next identifier to use for outbound fragmented messages |
| 119 | * @reasm_buf: head of partially reassembled inbound message fragments |
| 120 | * @bc_rcvr: marks that this is a broadcast receiver link |
| 121 | * @stats: collects statistics regarding link activity |
| 122 | */ |
| 123 | struct tipc_link { |
| 124 | u32 addr; |
| 125 | char name[TIPC_MAX_LINK_NAME]; |
Jon Paul Maloy | 38206d5 | 2015-11-19 14:30:46 -0500 | [diff] [blame] | 126 | struct net *net; |
| 127 | |
| 128 | /* Management and link supervision data */ |
| 129 | u32 peer_session; |
Jon Paul Maloy | e74a386 | 2016-03-03 14:23:21 -0500 | [diff] [blame^] | 130 | u32 session; |
Jon Paul Maloy | 38206d5 | 2015-11-19 14:30:46 -0500 | [diff] [blame] | 131 | u32 peer_bearer_id; |
| 132 | u32 bearer_id; |
| 133 | u32 tolerance; |
| 134 | unsigned long keepalive_intv; |
| 135 | u32 abort_limit; |
| 136 | u32 state; |
| 137 | u16 peer_caps; |
| 138 | bool active; |
| 139 | u32 silent_intv_cnt; |
Jon Paul Maloy | e74a386 | 2016-03-03 14:23:21 -0500 | [diff] [blame^] | 140 | char if_name[TIPC_MAX_IF_NAME]; |
Jon Paul Maloy | 38206d5 | 2015-11-19 14:30:46 -0500 | [diff] [blame] | 141 | u32 priority; |
| 142 | char net_plane; |
| 143 | |
| 144 | /* Failover/synch */ |
| 145 | u16 drop_point; |
| 146 | struct sk_buff *failover_reasm_skb; |
| 147 | |
| 148 | /* Max packet negotiation */ |
| 149 | u16 mtu; |
| 150 | u16 advertised_mtu; |
| 151 | |
| 152 | /* Sending */ |
| 153 | struct sk_buff_head transmq; |
| 154 | struct sk_buff_head backlogq; |
| 155 | struct { |
| 156 | u16 len; |
| 157 | u16 limit; |
| 158 | } backlog[5]; |
| 159 | u16 snd_nxt; |
| 160 | u16 last_retransm; |
| 161 | u16 window; |
| 162 | u32 stale_count; |
| 163 | |
| 164 | /* Reception */ |
| 165 | u16 rcv_nxt; |
| 166 | u32 rcv_unacked; |
| 167 | struct sk_buff_head deferdq; |
| 168 | struct sk_buff_head *inputq; |
| 169 | struct sk_buff_head *namedq; |
| 170 | |
| 171 | /* Congestion handling */ |
| 172 | struct sk_buff_head wakeupq; |
| 173 | |
| 174 | /* Fragmentation/reassembly */ |
| 175 | struct sk_buff *reasm_buf; |
| 176 | |
| 177 | /* Broadcast */ |
| 178 | u16 ackers; |
| 179 | u16 acked; |
| 180 | struct tipc_link *bc_rcvlink; |
| 181 | struct tipc_link *bc_sndlink; |
| 182 | int nack_state; |
| 183 | bool bc_peer_is_up; |
| 184 | |
| 185 | /* Statistics */ |
| 186 | struct tipc_stats stats; |
| 187 | }; |
| 188 | |
Erik Hugne | 2cf8aa1 | 2012-06-29 00:16:37 -0400 | [diff] [blame] | 189 | /* |
| 190 | * Error message prefixes |
| 191 | */ |
Jon Paul Maloy | 6e49815 | 2015-07-30 18:24:19 -0400 | [diff] [blame] | 192 | static const char *link_co_err = "Link tunneling error, "; |
Erik Hugne | 2cf8aa1 | 2012-06-29 00:16:37 -0400 | [diff] [blame] | 193 | static const char *link_rst_msg = "Resetting link "; |
Richard Alpe | 7be57fc | 2014-11-20 10:29:12 +0100 | [diff] [blame] | 194 | |
Richard Alpe | 0655f6a | 2014-11-20 10:29:07 +0100 | [diff] [blame] | 195 | /* Properties valid for media, bearar and link */ |
| 196 | static const struct nla_policy tipc_nl_prop_policy[TIPC_NLA_PROP_MAX + 1] = { |
| 197 | [TIPC_NLA_PROP_UNSPEC] = { .type = NLA_UNSPEC }, |
| 198 | [TIPC_NLA_PROP_PRIO] = { .type = NLA_U32 }, |
| 199 | [TIPC_NLA_PROP_TOL] = { .type = NLA_U32 }, |
| 200 | [TIPC_NLA_PROP_WIN] = { .type = NLA_U32 } |
| 201 | }; |
| 202 | |
Jon Paul Maloy | 5266698 | 2015-10-22 08:51:41 -0400 | [diff] [blame] | 203 | /* Send states for broadcast NACKs |
| 204 | */ |
| 205 | enum { |
| 206 | BC_NACK_SND_CONDITIONAL, |
| 207 | BC_NACK_SND_UNCONDITIONAL, |
| 208 | BC_NACK_SND_SUPPRESS, |
| 209 | }; |
| 210 | |
YOSHIFUJI Hideaki | c430728 | 2007-02-09 23:25:21 +0900 | [diff] [blame] | 211 | /* |
Jon Paul Maloy | d999297 | 2015-07-16 16:54:31 -0400 | [diff] [blame] | 212 | * Interval between NACKs when packets arrive out of order |
| 213 | */ |
| 214 | #define TIPC_NACK_INTV (TIPC_MIN_LINK_WIN * 2) |
Jon Paul Maloy | e74a386 | 2016-03-03 14:23:21 -0500 | [diff] [blame^] | 215 | |
| 216 | /* Wildcard value for link session numbers. When it is known that |
| 217 | * peer endpoint is down, any session number must be accepted. |
Allan Stephens | a686e68 | 2008-06-04 17:29:39 -0700 | [diff] [blame] | 218 | */ |
Jon Paul Maloy | e74a386 | 2016-03-03 14:23:21 -0500 | [diff] [blame^] | 219 | #define ANY_SESSION 0x10000 |
Allan Stephens | a686e68 | 2008-06-04 17:29:39 -0700 | [diff] [blame] | 220 | |
Jon Paul Maloy | 662921c | 2015-07-30 18:24:21 -0400 | [diff] [blame] | 221 | /* Link FSM states: |
Jon Paul Maloy | d3504c3 | 2015-07-16 16:54:25 -0400 | [diff] [blame] | 222 | */ |
| 223 | enum { |
Jon Paul Maloy | 662921c | 2015-07-30 18:24:21 -0400 | [diff] [blame] | 224 | LINK_ESTABLISHED = 0xe, |
| 225 | LINK_ESTABLISHING = 0xe << 4, |
| 226 | LINK_RESET = 0x1 << 8, |
| 227 | LINK_RESETTING = 0x2 << 12, |
| 228 | LINK_PEER_RESET = 0xd << 16, |
| 229 | LINK_FAILINGOVER = 0xf << 20, |
| 230 | LINK_SYNCHING = 0xc << 24 |
Jon Paul Maloy | d3504c3 | 2015-07-16 16:54:25 -0400 | [diff] [blame] | 231 | }; |
| 232 | |
| 233 | /* Link FSM state checking routines |
| 234 | */ |
Jon Paul Maloy | 662921c | 2015-07-30 18:24:21 -0400 | [diff] [blame] | 235 | static int link_is_up(struct tipc_link *l) |
Jon Paul Maloy | d3504c3 | 2015-07-16 16:54:25 -0400 | [diff] [blame] | 236 | { |
Jon Paul Maloy | 662921c | 2015-07-30 18:24:21 -0400 | [diff] [blame] | 237 | return l->state & (LINK_ESTABLISHED | LINK_SYNCHING); |
Jon Paul Maloy | d3504c3 | 2015-07-16 16:54:25 -0400 | [diff] [blame] | 238 | } |
| 239 | |
Jon Paul Maloy | d999297 | 2015-07-16 16:54:31 -0400 | [diff] [blame] | 240 | static int tipc_link_proto_rcv(struct tipc_link *l, struct sk_buff *skb, |
| 241 | struct sk_buff_head *xmitq); |
Jon Paul Maloy | 426cc2b | 2015-07-16 16:54:26 -0400 | [diff] [blame] | 242 | static void tipc_link_build_proto_msg(struct tipc_link *l, int mtyp, bool probe, |
| 243 | u16 rcvgap, int tolerance, int priority, |
| 244 | struct sk_buff_head *xmitq); |
Jon Paul Maloy | 1a90632 | 2015-11-19 14:30:47 -0500 | [diff] [blame] | 245 | static void link_print(struct tipc_link *l, const char *str); |
Jon Paul Maloy | 5266698 | 2015-10-22 08:51:41 -0400 | [diff] [blame] | 246 | static void tipc_link_build_nack_msg(struct tipc_link *l, |
| 247 | struct sk_buff_head *xmitq); |
| 248 | static void tipc_link_build_bc_init_msg(struct tipc_link *l, |
| 249 | struct sk_buff_head *xmitq); |
| 250 | static bool tipc_link_release_pkts(struct tipc_link *l, u16 to); |
Jon Paul Maloy | 8b4ed86 | 2015-03-25 12:07:26 -0400 | [diff] [blame] | 251 | |
Per Liden | b97bf3f | 2006-01-02 19:04:38 +0100 | [diff] [blame] | 252 | /* |
Sam Ravnborg | 05790c6 | 2006-03-20 22:37:04 -0800 | [diff] [blame] | 253 | * Simple non-static link routines (i.e. referenced outside this file) |
Per Liden | b97bf3f | 2006-01-02 19:04:38 +0100 | [diff] [blame] | 254 | */ |
Jon Paul Maloy | 662921c | 2015-07-30 18:24:21 -0400 | [diff] [blame] | 255 | bool tipc_link_is_up(struct tipc_link *l) |
Per Liden | b97bf3f | 2006-01-02 19:04:38 +0100 | [diff] [blame] | 256 | { |
Jon Paul Maloy | 662921c | 2015-07-30 18:24:21 -0400 | [diff] [blame] | 257 | return link_is_up(l); |
| 258 | } |
| 259 | |
Jon Paul Maloy | c819930 | 2015-10-15 14:52:46 -0400 | [diff] [blame] | 260 | bool tipc_link_peer_is_down(struct tipc_link *l) |
| 261 | { |
| 262 | return l->state == LINK_PEER_RESET; |
| 263 | } |
| 264 | |
Jon Paul Maloy | 662921c | 2015-07-30 18:24:21 -0400 | [diff] [blame] | 265 | bool tipc_link_is_reset(struct tipc_link *l) |
| 266 | { |
| 267 | return l->state & (LINK_RESET | LINK_FAILINGOVER | LINK_ESTABLISHING); |
| 268 | } |
| 269 | |
Jon Paul Maloy | 73f646c | 2015-10-15 14:52:44 -0400 | [diff] [blame] | 270 | bool tipc_link_is_establishing(struct tipc_link *l) |
| 271 | { |
| 272 | return l->state == LINK_ESTABLISHING; |
| 273 | } |
| 274 | |
Jon Paul Maloy | 662921c | 2015-07-30 18:24:21 -0400 | [diff] [blame] | 275 | bool tipc_link_is_synching(struct tipc_link *l) |
| 276 | { |
| 277 | return l->state == LINK_SYNCHING; |
| 278 | } |
| 279 | |
| 280 | bool tipc_link_is_failingover(struct tipc_link *l) |
| 281 | { |
| 282 | return l->state == LINK_FAILINGOVER; |
| 283 | } |
| 284 | |
| 285 | bool tipc_link_is_blocked(struct tipc_link *l) |
| 286 | { |
| 287 | return l->state & (LINK_RESETTING | LINK_PEER_RESET | LINK_FAILINGOVER); |
Per Liden | b97bf3f | 2006-01-02 19:04:38 +0100 | [diff] [blame] | 288 | } |
| 289 | |
Wu Fengguang | 742e038 | 2015-10-24 22:56:01 +0800 | [diff] [blame] | 290 | static bool link_is_bc_sndlink(struct tipc_link *l) |
Jon Paul Maloy | 5266698 | 2015-10-22 08:51:41 -0400 | [diff] [blame] | 291 | { |
| 292 | return !l->bc_sndlink; |
| 293 | } |
| 294 | |
Wu Fengguang | 742e038 | 2015-10-24 22:56:01 +0800 | [diff] [blame] | 295 | static bool link_is_bc_rcvlink(struct tipc_link *l) |
Jon Paul Maloy | 5266698 | 2015-10-22 08:51:41 -0400 | [diff] [blame] | 296 | { |
| 297 | return ((l->bc_rcvlink == l) && !link_is_bc_sndlink(l)); |
| 298 | } |
| 299 | |
Jon Paul Maloy | 9d13ec6 | 2015-07-16 16:54:19 -0400 | [diff] [blame] | 300 | int tipc_link_is_active(struct tipc_link *l) |
Per Liden | b97bf3f | 2006-01-02 19:04:38 +0100 | [diff] [blame] | 301 | { |
Jon Paul Maloy | c72fa87 | 2015-10-22 08:51:46 -0400 | [diff] [blame] | 302 | return l->active; |
| 303 | } |
Jon Paul Maloy | 9d13ec6 | 2015-07-16 16:54:19 -0400 | [diff] [blame] | 304 | |
Jon Paul Maloy | c72fa87 | 2015-10-22 08:51:46 -0400 | [diff] [blame] | 305 | void tipc_link_set_active(struct tipc_link *l, bool active) |
| 306 | { |
| 307 | l->active = active; |
Per Liden | b97bf3f | 2006-01-02 19:04:38 +0100 | [diff] [blame] | 308 | } |
| 309 | |
Jon Paul Maloy | 38206d5 | 2015-11-19 14:30:46 -0500 | [diff] [blame] | 310 | u32 tipc_link_id(struct tipc_link *l) |
| 311 | { |
| 312 | return l->peer_bearer_id << 16 | l->bearer_id; |
| 313 | } |
| 314 | |
| 315 | int tipc_link_window(struct tipc_link *l) |
| 316 | { |
| 317 | return l->window; |
| 318 | } |
| 319 | |
| 320 | int tipc_link_prio(struct tipc_link *l) |
| 321 | { |
| 322 | return l->priority; |
| 323 | } |
| 324 | |
| 325 | unsigned long tipc_link_tolerance(struct tipc_link *l) |
| 326 | { |
| 327 | return l->tolerance; |
| 328 | } |
| 329 | |
| 330 | struct sk_buff_head *tipc_link_inputq(struct tipc_link *l) |
| 331 | { |
| 332 | return l->inputq; |
| 333 | } |
| 334 | |
| 335 | char tipc_link_plane(struct tipc_link *l) |
| 336 | { |
| 337 | return l->net_plane; |
| 338 | } |
| 339 | |
Jon Paul Maloy | 5266698 | 2015-10-22 08:51:41 -0400 | [diff] [blame] | 340 | void tipc_link_add_bc_peer(struct tipc_link *snd_l, |
| 341 | struct tipc_link *uc_l, |
| 342 | struct sk_buff_head *xmitq) |
Jon Paul Maloy | 2f56612 | 2015-10-22 08:51:39 -0400 | [diff] [blame] | 343 | { |
Jon Paul Maloy | 5266698 | 2015-10-22 08:51:41 -0400 | [diff] [blame] | 344 | struct tipc_link *rcv_l = uc_l->bc_rcvlink; |
| 345 | |
| 346 | snd_l->ackers++; |
| 347 | rcv_l->acked = snd_l->snd_nxt - 1; |
Jon Paul Maloy | 9a65083 | 2015-11-19 14:12:50 -0500 | [diff] [blame] | 348 | snd_l->state = LINK_ESTABLISHED; |
Jon Paul Maloy | 5266698 | 2015-10-22 08:51:41 -0400 | [diff] [blame] | 349 | tipc_link_build_bc_init_msg(uc_l, xmitq); |
Jon Paul Maloy | 2f56612 | 2015-10-22 08:51:39 -0400 | [diff] [blame] | 350 | } |
| 351 | |
Jon Paul Maloy | 5266698 | 2015-10-22 08:51:41 -0400 | [diff] [blame] | 352 | void tipc_link_remove_bc_peer(struct tipc_link *snd_l, |
| 353 | struct tipc_link *rcv_l, |
| 354 | struct sk_buff_head *xmitq) |
Jon Paul Maloy | 2f56612 | 2015-10-22 08:51:39 -0400 | [diff] [blame] | 355 | { |
Jon Paul Maloy | 5266698 | 2015-10-22 08:51:41 -0400 | [diff] [blame] | 356 | u16 ack = snd_l->snd_nxt - 1; |
| 357 | |
| 358 | snd_l->ackers--; |
| 359 | tipc_link_bc_ack_rcv(rcv_l, ack, xmitq); |
| 360 | tipc_link_reset(rcv_l); |
| 361 | rcv_l->state = LINK_RESET; |
| 362 | if (!snd_l->ackers) { |
| 363 | tipc_link_reset(snd_l); |
Jon Paul Maloy | 9a65083 | 2015-11-19 14:12:50 -0500 | [diff] [blame] | 364 | snd_l->state = LINK_RESET; |
Jon Paul Maloy | 5266698 | 2015-10-22 08:51:41 -0400 | [diff] [blame] | 365 | __skb_queue_purge(xmitq); |
| 366 | } |
Jon Paul Maloy | 2f56612 | 2015-10-22 08:51:39 -0400 | [diff] [blame] | 367 | } |
| 368 | |
| 369 | int tipc_link_bc_peers(struct tipc_link *l) |
| 370 | { |
| 371 | return l->ackers; |
| 372 | } |
| 373 | |
Jon Paul Maloy | 959e178 | 2015-10-22 08:51:43 -0400 | [diff] [blame] | 374 | void tipc_link_set_mtu(struct tipc_link *l, int mtu) |
| 375 | { |
| 376 | l->mtu = mtu; |
| 377 | } |
| 378 | |
| 379 | int tipc_link_mtu(struct tipc_link *l) |
| 380 | { |
| 381 | return l->mtu; |
| 382 | } |
| 383 | |
Jon Paul Maloy | 38206d5 | 2015-11-19 14:30:46 -0500 | [diff] [blame] | 384 | u16 tipc_link_rcv_nxt(struct tipc_link *l) |
| 385 | { |
| 386 | return l->rcv_nxt; |
| 387 | } |
| 388 | |
| 389 | u16 tipc_link_acked(struct tipc_link *l) |
| 390 | { |
| 391 | return l->acked; |
| 392 | } |
| 393 | |
| 394 | char *tipc_link_name(struct tipc_link *l) |
| 395 | { |
| 396 | return l->name; |
| 397 | } |
| 398 | |
Per Liden | b97bf3f | 2006-01-02 19:04:38 +0100 | [diff] [blame] | 399 | /** |
Per Liden | 4323add | 2006-01-18 00:38:21 +0100 | [diff] [blame] | 400 | * tipc_link_create - create a new link |
Jon Paul Maloy | 440d896 | 2015-07-30 18:24:26 -0400 | [diff] [blame] | 401 | * @n: pointer to associated node |
Jon Paul Maloy | 0e05498 | 2015-10-22 08:51:36 -0400 | [diff] [blame] | 402 | * @if_name: associated interface name |
| 403 | * @bearer_id: id (index) of associated bearer |
| 404 | * @tolerance: link tolerance to be used by link |
| 405 | * @net_plane: network plane (A,B,c..) this link belongs to |
| 406 | * @mtu: mtu to be advertised by link |
| 407 | * @priority: priority to be used by link |
| 408 | * @window: send window to be used by link |
| 409 | * @session: session to be used by link |
Jon Paul Maloy | 440d896 | 2015-07-30 18:24:26 -0400 | [diff] [blame] | 410 | * @ownnode: identity of own node |
Jon Paul Maloy | 0e05498 | 2015-10-22 08:51:36 -0400 | [diff] [blame] | 411 | * @peer: node id of peer node |
Jon Paul Maloy | fd556f2 | 2015-10-22 08:51:40 -0400 | [diff] [blame] | 412 | * @peer_caps: bitmap describing peer node capabilities |
Jon Paul Maloy | 5266698 | 2015-10-22 08:51:41 -0400 | [diff] [blame] | 413 | * @bc_sndlink: the namespace global link used for broadcast sending |
| 414 | * @bc_rcvlink: the peer specific link used for broadcast reception |
Jon Paul Maloy | 440d896 | 2015-07-30 18:24:26 -0400 | [diff] [blame] | 415 | * @inputq: queue to put messages ready for delivery |
| 416 | * @namedq: queue to put binding table update messages ready for delivery |
| 417 | * @link: return value, pointer to put the created link |
YOSHIFUJI Hideaki | c430728 | 2007-02-09 23:25:21 +0900 | [diff] [blame] | 418 | * |
Jon Paul Maloy | 440d896 | 2015-07-30 18:24:26 -0400 | [diff] [blame] | 419 | * Returns true if link was created, otherwise false |
Per Liden | b97bf3f | 2006-01-02 19:04:38 +0100 | [diff] [blame] | 420 | */ |
Jon Paul Maloy | c72fa87 | 2015-10-22 08:51:46 -0400 | [diff] [blame] | 421 | bool tipc_link_create(struct net *net, char *if_name, int bearer_id, |
Jon Paul Maloy | 0e05498 | 2015-10-22 08:51:36 -0400 | [diff] [blame] | 422 | int tolerance, char net_plane, u32 mtu, int priority, |
| 423 | int window, u32 session, u32 ownnode, u32 peer, |
Jon Paul Maloy | 5266698 | 2015-10-22 08:51:41 -0400 | [diff] [blame] | 424 | u16 peer_caps, |
Jon Paul Maloy | 5266698 | 2015-10-22 08:51:41 -0400 | [diff] [blame] | 425 | struct tipc_link *bc_sndlink, |
| 426 | struct tipc_link *bc_rcvlink, |
| 427 | struct sk_buff_head *inputq, |
| 428 | struct sk_buff_head *namedq, |
Jon Paul Maloy | 440d896 | 2015-07-30 18:24:26 -0400 | [diff] [blame] | 429 | struct tipc_link **link) |
Per Liden | b97bf3f | 2006-01-02 19:04:38 +0100 | [diff] [blame] | 430 | { |
Jon Paul Maloy | 440d896 | 2015-07-30 18:24:26 -0400 | [diff] [blame] | 431 | struct tipc_link *l; |
Allan Stephens | 37b9c08 | 2011-02-28 11:32:27 -0500 | [diff] [blame] | 432 | |
Jon Paul Maloy | 440d896 | 2015-07-30 18:24:26 -0400 | [diff] [blame] | 433 | l = kzalloc(sizeof(*l), GFP_ATOMIC); |
| 434 | if (!l) |
| 435 | return false; |
| 436 | *link = l; |
Jon Paul Maloy | e74a386 | 2016-03-03 14:23:21 -0500 | [diff] [blame^] | 437 | l->session = session; |
Jon Paul Maloy | 0e05498 | 2015-10-22 08:51:36 -0400 | [diff] [blame] | 438 | |
| 439 | /* Note: peer i/f name is completed by reset/activate message */ |
| 440 | sprintf(l->name, "%u.%u.%u:%s-%u.%u.%u:unknown", |
| 441 | tipc_zone(ownnode), tipc_cluster(ownnode), tipc_node(ownnode), |
| 442 | if_name, tipc_zone(peer), tipc_cluster(peer), tipc_node(peer)); |
Jon Paul Maloy | e74a386 | 2016-03-03 14:23:21 -0500 | [diff] [blame^] | 443 | strcpy(l->if_name, if_name); |
Jon Paul Maloy | 0e05498 | 2015-10-22 08:51:36 -0400 | [diff] [blame] | 444 | l->addr = peer; |
Jon Paul Maloy | fd556f2 | 2015-10-22 08:51:40 -0400 | [diff] [blame] | 445 | l->peer_caps = peer_caps; |
Jon Paul Maloy | c72fa87 | 2015-10-22 08:51:46 -0400 | [diff] [blame] | 446 | l->net = net; |
Jon Paul Maloy | e74a386 | 2016-03-03 14:23:21 -0500 | [diff] [blame^] | 447 | l->peer_session = ANY_SESSION; |
Jon Paul Maloy | 0e05498 | 2015-10-22 08:51:36 -0400 | [diff] [blame] | 448 | l->bearer_id = bearer_id; |
| 449 | l->tolerance = tolerance; |
| 450 | l->net_plane = net_plane; |
| 451 | l->advertised_mtu = mtu; |
| 452 | l->mtu = mtu; |
| 453 | l->priority = priority; |
| 454 | tipc_link_set_queue_limits(l, window); |
Jon Paul Maloy | c1ab3f1d | 2015-10-22 08:51:38 -0400 | [diff] [blame] | 455 | l->ackers = 1; |
Jon Paul Maloy | 5266698 | 2015-10-22 08:51:41 -0400 | [diff] [blame] | 456 | l->bc_sndlink = bc_sndlink; |
| 457 | l->bc_rcvlink = bc_rcvlink; |
Jon Paul Maloy | 0e05498 | 2015-10-22 08:51:36 -0400 | [diff] [blame] | 458 | l->inputq = inputq; |
| 459 | l->namedq = namedq; |
| 460 | l->state = LINK_RESETTING; |
Jon Paul Maloy | 440d896 | 2015-07-30 18:24:26 -0400 | [diff] [blame] | 461 | __skb_queue_head_init(&l->transmq); |
| 462 | __skb_queue_head_init(&l->backlogq); |
| 463 | __skb_queue_head_init(&l->deferdq); |
| 464 | skb_queue_head_init(&l->wakeupq); |
| 465 | skb_queue_head_init(l->inputq); |
| 466 | return true; |
Per Liden | b97bf3f | 2006-01-02 19:04:38 +0100 | [diff] [blame] | 467 | } |
| 468 | |
Jon Paul Maloy | 3230190 | 2015-10-22 08:51:37 -0400 | [diff] [blame] | 469 | /** |
| 470 | * tipc_link_bc_create - create new link to be used for broadcast |
| 471 | * @n: pointer to associated node |
| 472 | * @mtu: mtu to be used |
| 473 | * @window: send window to be used |
| 474 | * @inputq: queue to put messages ready for delivery |
| 475 | * @namedq: queue to put binding table update messages ready for delivery |
| 476 | * @link: return value, pointer to put the created link |
| 477 | * |
| 478 | * Returns true if link was created, otherwise false |
| 479 | */ |
Jon Paul Maloy | c72fa87 | 2015-10-22 08:51:46 -0400 | [diff] [blame] | 480 | bool tipc_link_bc_create(struct net *net, u32 ownnode, u32 peer, |
Jon Paul Maloy | 5266698 | 2015-10-22 08:51:41 -0400 | [diff] [blame] | 481 | int mtu, int window, u16 peer_caps, |
Jon Paul Maloy | 3230190 | 2015-10-22 08:51:37 -0400 | [diff] [blame] | 482 | struct sk_buff_head *inputq, |
| 483 | struct sk_buff_head *namedq, |
Jon Paul Maloy | 5266698 | 2015-10-22 08:51:41 -0400 | [diff] [blame] | 484 | struct tipc_link *bc_sndlink, |
Jon Paul Maloy | 3230190 | 2015-10-22 08:51:37 -0400 | [diff] [blame] | 485 | struct tipc_link **link) |
| 486 | { |
| 487 | struct tipc_link *l; |
| 488 | |
Jon Paul Maloy | c72fa87 | 2015-10-22 08:51:46 -0400 | [diff] [blame] | 489 | if (!tipc_link_create(net, "", MAX_BEARERS, 0, 'Z', mtu, 0, window, |
Jon Paul Maloy | 2af5ae3 | 2015-10-22 08:51:48 -0400 | [diff] [blame] | 490 | 0, ownnode, peer, peer_caps, bc_sndlink, |
Jon Paul Maloy | 5266698 | 2015-10-22 08:51:41 -0400 | [diff] [blame] | 491 | NULL, inputq, namedq, link)) |
Jon Paul Maloy | 3230190 | 2015-10-22 08:51:37 -0400 | [diff] [blame] | 492 | return false; |
| 493 | |
| 494 | l = *link; |
| 495 | strcpy(l->name, tipc_bclink_name); |
| 496 | tipc_link_reset(l); |
Jon Paul Maloy | 5266698 | 2015-10-22 08:51:41 -0400 | [diff] [blame] | 497 | l->state = LINK_RESET; |
Jon Paul Maloy | 2f56612 | 2015-10-22 08:51:39 -0400 | [diff] [blame] | 498 | l->ackers = 0; |
Jon Paul Maloy | 5266698 | 2015-10-22 08:51:41 -0400 | [diff] [blame] | 499 | l->bc_rcvlink = l; |
| 500 | |
| 501 | /* Broadcast send link is always up */ |
| 502 | if (link_is_bc_sndlink(l)) |
| 503 | l->state = LINK_ESTABLISHED; |
| 504 | |
Jon Paul Maloy | 3230190 | 2015-10-22 08:51:37 -0400 | [diff] [blame] | 505 | return true; |
| 506 | } |
| 507 | |
Per Liden | b97bf3f | 2006-01-02 19:04:38 +0100 | [diff] [blame] | 508 | /** |
Jon Paul Maloy | 6ab30f9 | 2015-07-16 16:54:27 -0400 | [diff] [blame] | 509 | * tipc_link_fsm_evt - link finite state machine |
| 510 | * @l: pointer to link |
| 511 | * @evt: state machine event to be processed |
Jon Paul Maloy | 6ab30f9 | 2015-07-16 16:54:27 -0400 | [diff] [blame] | 512 | */ |
Jon Paul Maloy | 662921c | 2015-07-30 18:24:21 -0400 | [diff] [blame] | 513 | int tipc_link_fsm_evt(struct tipc_link *l, int evt) |
Jon Paul Maloy | 6ab30f9 | 2015-07-16 16:54:27 -0400 | [diff] [blame] | 514 | { |
Jon Paul Maloy | 5045f7b | 2015-07-30 18:24:20 -0400 | [diff] [blame] | 515 | int rc = 0; |
Jon Paul Maloy | 6ab30f9 | 2015-07-16 16:54:27 -0400 | [diff] [blame] | 516 | |
| 517 | switch (l->state) { |
Jon Paul Maloy | 662921c | 2015-07-30 18:24:21 -0400 | [diff] [blame] | 518 | case LINK_RESETTING: |
Jon Paul Maloy | 6ab30f9 | 2015-07-16 16:54:27 -0400 | [diff] [blame] | 519 | switch (evt) { |
Jon Paul Maloy | 662921c | 2015-07-30 18:24:21 -0400 | [diff] [blame] | 520 | case LINK_PEER_RESET_EVT: |
| 521 | l->state = LINK_PEER_RESET; |
Jon Paul Maloy | 6ab30f9 | 2015-07-16 16:54:27 -0400 | [diff] [blame] | 522 | break; |
Jon Paul Maloy | 662921c | 2015-07-30 18:24:21 -0400 | [diff] [blame] | 523 | case LINK_RESET_EVT: |
| 524 | l->state = LINK_RESET; |
Jon Paul Maloy | 6ab30f9 | 2015-07-16 16:54:27 -0400 | [diff] [blame] | 525 | break; |
Jon Paul Maloy | 662921c | 2015-07-30 18:24:21 -0400 | [diff] [blame] | 526 | case LINK_FAILURE_EVT: |
| 527 | case LINK_FAILOVER_BEGIN_EVT: |
| 528 | case LINK_ESTABLISH_EVT: |
| 529 | case LINK_FAILOVER_END_EVT: |
| 530 | case LINK_SYNCH_BEGIN_EVT: |
| 531 | case LINK_SYNCH_END_EVT: |
Jon Paul Maloy | 6ab30f9 | 2015-07-16 16:54:27 -0400 | [diff] [blame] | 532 | default: |
Jon Paul Maloy | 662921c | 2015-07-30 18:24:21 -0400 | [diff] [blame] | 533 | goto illegal_evt; |
Jon Paul Maloy | 6ab30f9 | 2015-07-16 16:54:27 -0400 | [diff] [blame] | 534 | } |
| 535 | break; |
Jon Paul Maloy | 662921c | 2015-07-30 18:24:21 -0400 | [diff] [blame] | 536 | case LINK_RESET: |
Jon Paul Maloy | 6ab30f9 | 2015-07-16 16:54:27 -0400 | [diff] [blame] | 537 | switch (evt) { |
Jon Paul Maloy | 662921c | 2015-07-30 18:24:21 -0400 | [diff] [blame] | 538 | case LINK_PEER_RESET_EVT: |
| 539 | l->state = LINK_ESTABLISHING; |
Jon Paul Maloy | 6ab30f9 | 2015-07-16 16:54:27 -0400 | [diff] [blame] | 540 | break; |
Jon Paul Maloy | 662921c | 2015-07-30 18:24:21 -0400 | [diff] [blame] | 541 | case LINK_FAILOVER_BEGIN_EVT: |
| 542 | l->state = LINK_FAILINGOVER; |
| 543 | case LINK_FAILURE_EVT: |
| 544 | case LINK_RESET_EVT: |
| 545 | case LINK_ESTABLISH_EVT: |
| 546 | case LINK_FAILOVER_END_EVT: |
Jon Paul Maloy | 6ab30f9 | 2015-07-16 16:54:27 -0400 | [diff] [blame] | 547 | break; |
Jon Paul Maloy | 662921c | 2015-07-30 18:24:21 -0400 | [diff] [blame] | 548 | case LINK_SYNCH_BEGIN_EVT: |
| 549 | case LINK_SYNCH_END_EVT: |
Jon Paul Maloy | 6ab30f9 | 2015-07-16 16:54:27 -0400 | [diff] [blame] | 550 | default: |
Jon Paul Maloy | 662921c | 2015-07-30 18:24:21 -0400 | [diff] [blame] | 551 | goto illegal_evt; |
Jon Paul Maloy | 6ab30f9 | 2015-07-16 16:54:27 -0400 | [diff] [blame] | 552 | } |
| 553 | break; |
Jon Paul Maloy | 662921c | 2015-07-30 18:24:21 -0400 | [diff] [blame] | 554 | case LINK_PEER_RESET: |
Jon Paul Maloy | 6ab30f9 | 2015-07-16 16:54:27 -0400 | [diff] [blame] | 555 | switch (evt) { |
Jon Paul Maloy | 662921c | 2015-07-30 18:24:21 -0400 | [diff] [blame] | 556 | case LINK_RESET_EVT: |
| 557 | l->state = LINK_ESTABLISHING; |
Jon Paul Maloy | 6ab30f9 | 2015-07-16 16:54:27 -0400 | [diff] [blame] | 558 | break; |
Jon Paul Maloy | 662921c | 2015-07-30 18:24:21 -0400 | [diff] [blame] | 559 | case LINK_PEER_RESET_EVT: |
| 560 | case LINK_ESTABLISH_EVT: |
| 561 | case LINK_FAILURE_EVT: |
Jon Paul Maloy | 6ab30f9 | 2015-07-16 16:54:27 -0400 | [diff] [blame] | 562 | break; |
Jon Paul Maloy | 662921c | 2015-07-30 18:24:21 -0400 | [diff] [blame] | 563 | case LINK_SYNCH_BEGIN_EVT: |
| 564 | case LINK_SYNCH_END_EVT: |
| 565 | case LINK_FAILOVER_BEGIN_EVT: |
| 566 | case LINK_FAILOVER_END_EVT: |
Jon Paul Maloy | 6ab30f9 | 2015-07-16 16:54:27 -0400 | [diff] [blame] | 567 | default: |
Jon Paul Maloy | 662921c | 2015-07-30 18:24:21 -0400 | [diff] [blame] | 568 | goto illegal_evt; |
Jon Paul Maloy | 6ab30f9 | 2015-07-16 16:54:27 -0400 | [diff] [blame] | 569 | } |
| 570 | break; |
Jon Paul Maloy | 662921c | 2015-07-30 18:24:21 -0400 | [diff] [blame] | 571 | case LINK_FAILINGOVER: |
Jon Paul Maloy | 6ab30f9 | 2015-07-16 16:54:27 -0400 | [diff] [blame] | 572 | switch (evt) { |
Jon Paul Maloy | 662921c | 2015-07-30 18:24:21 -0400 | [diff] [blame] | 573 | case LINK_FAILOVER_END_EVT: |
| 574 | l->state = LINK_RESET; |
Jon Paul Maloy | 6ab30f9 | 2015-07-16 16:54:27 -0400 | [diff] [blame] | 575 | break; |
Jon Paul Maloy | 662921c | 2015-07-30 18:24:21 -0400 | [diff] [blame] | 576 | case LINK_PEER_RESET_EVT: |
| 577 | case LINK_RESET_EVT: |
| 578 | case LINK_ESTABLISH_EVT: |
| 579 | case LINK_FAILURE_EVT: |
Jon Paul Maloy | 6ab30f9 | 2015-07-16 16:54:27 -0400 | [diff] [blame] | 580 | break; |
Jon Paul Maloy | 662921c | 2015-07-30 18:24:21 -0400 | [diff] [blame] | 581 | case LINK_FAILOVER_BEGIN_EVT: |
| 582 | case LINK_SYNCH_BEGIN_EVT: |
| 583 | case LINK_SYNCH_END_EVT: |
Jon Paul Maloy | 6ab30f9 | 2015-07-16 16:54:27 -0400 | [diff] [blame] | 584 | default: |
Jon Paul Maloy | 662921c | 2015-07-30 18:24:21 -0400 | [diff] [blame] | 585 | goto illegal_evt; |
| 586 | } |
| 587 | break; |
| 588 | case LINK_ESTABLISHING: |
| 589 | switch (evt) { |
| 590 | case LINK_ESTABLISH_EVT: |
| 591 | l->state = LINK_ESTABLISHED; |
Jon Paul Maloy | 662921c | 2015-07-30 18:24:21 -0400 | [diff] [blame] | 592 | break; |
| 593 | case LINK_FAILOVER_BEGIN_EVT: |
| 594 | l->state = LINK_FAILINGOVER; |
| 595 | break; |
Jon Paul Maloy | 662921c | 2015-07-30 18:24:21 -0400 | [diff] [blame] | 596 | case LINK_RESET_EVT: |
Jon Paul Maloy | 73f646c | 2015-10-15 14:52:44 -0400 | [diff] [blame] | 597 | l->state = LINK_RESET; |
| 598 | break; |
Jon Paul Maloy | 662921c | 2015-07-30 18:24:21 -0400 | [diff] [blame] | 599 | case LINK_FAILURE_EVT: |
Jon Paul Maloy | 73f646c | 2015-10-15 14:52:44 -0400 | [diff] [blame] | 600 | case LINK_PEER_RESET_EVT: |
Jon Paul Maloy | 662921c | 2015-07-30 18:24:21 -0400 | [diff] [blame] | 601 | case LINK_SYNCH_BEGIN_EVT: |
| 602 | case LINK_FAILOVER_END_EVT: |
| 603 | break; |
| 604 | case LINK_SYNCH_END_EVT: |
| 605 | default: |
| 606 | goto illegal_evt; |
| 607 | } |
| 608 | break; |
| 609 | case LINK_ESTABLISHED: |
| 610 | switch (evt) { |
| 611 | case LINK_PEER_RESET_EVT: |
| 612 | l->state = LINK_PEER_RESET; |
| 613 | rc |= TIPC_LINK_DOWN_EVT; |
| 614 | break; |
| 615 | case LINK_FAILURE_EVT: |
| 616 | l->state = LINK_RESETTING; |
| 617 | rc |= TIPC_LINK_DOWN_EVT; |
| 618 | break; |
| 619 | case LINK_RESET_EVT: |
| 620 | l->state = LINK_RESET; |
| 621 | break; |
| 622 | case LINK_ESTABLISH_EVT: |
Jon Paul Maloy | 5ae2f8e | 2015-08-20 02:12:55 -0400 | [diff] [blame] | 623 | case LINK_SYNCH_END_EVT: |
Jon Paul Maloy | 662921c | 2015-07-30 18:24:21 -0400 | [diff] [blame] | 624 | break; |
| 625 | case LINK_SYNCH_BEGIN_EVT: |
| 626 | l->state = LINK_SYNCHING; |
| 627 | break; |
Jon Paul Maloy | 662921c | 2015-07-30 18:24:21 -0400 | [diff] [blame] | 628 | case LINK_FAILOVER_BEGIN_EVT: |
| 629 | case LINK_FAILOVER_END_EVT: |
| 630 | default: |
| 631 | goto illegal_evt; |
| 632 | } |
| 633 | break; |
| 634 | case LINK_SYNCHING: |
| 635 | switch (evt) { |
| 636 | case LINK_PEER_RESET_EVT: |
| 637 | l->state = LINK_PEER_RESET; |
| 638 | rc |= TIPC_LINK_DOWN_EVT; |
| 639 | break; |
| 640 | case LINK_FAILURE_EVT: |
| 641 | l->state = LINK_RESETTING; |
| 642 | rc |= TIPC_LINK_DOWN_EVT; |
| 643 | break; |
| 644 | case LINK_RESET_EVT: |
| 645 | l->state = LINK_RESET; |
| 646 | break; |
| 647 | case LINK_ESTABLISH_EVT: |
| 648 | case LINK_SYNCH_BEGIN_EVT: |
| 649 | break; |
| 650 | case LINK_SYNCH_END_EVT: |
| 651 | l->state = LINK_ESTABLISHED; |
| 652 | break; |
| 653 | case LINK_FAILOVER_BEGIN_EVT: |
| 654 | case LINK_FAILOVER_END_EVT: |
| 655 | default: |
| 656 | goto illegal_evt; |
Jon Paul Maloy | 6ab30f9 | 2015-07-16 16:54:27 -0400 | [diff] [blame] | 657 | } |
| 658 | break; |
| 659 | default: |
Jon Paul Maloy | 662921c | 2015-07-30 18:24:21 -0400 | [diff] [blame] | 660 | pr_err("Unknown FSM state %x in %s\n", l->state, l->name); |
Jon Paul Maloy | 6ab30f9 | 2015-07-16 16:54:27 -0400 | [diff] [blame] | 661 | } |
Jon Paul Maloy | 662921c | 2015-07-30 18:24:21 -0400 | [diff] [blame] | 662 | return rc; |
| 663 | illegal_evt: |
| 664 | pr_err("Illegal FSM event %x in state %x on link %s\n", |
| 665 | evt, l->state, l->name); |
Jon Paul Maloy | 6ab30f9 | 2015-07-16 16:54:27 -0400 | [diff] [blame] | 666 | return rc; |
| 667 | } |
| 668 | |
Jon Paul Maloy | 333ef69 | 2015-07-16 16:54:28 -0400 | [diff] [blame] | 669 | /* link_profile_stats - update statistical profiling of traffic |
| 670 | */ |
| 671 | static void link_profile_stats(struct tipc_link *l) |
| 672 | { |
| 673 | struct sk_buff *skb; |
| 674 | struct tipc_msg *msg; |
| 675 | int length; |
| 676 | |
| 677 | /* Update counters used in statistical profiling of send traffic */ |
| 678 | l->stats.accu_queue_sz += skb_queue_len(&l->transmq); |
| 679 | l->stats.queue_sz_counts++; |
| 680 | |
| 681 | skb = skb_peek(&l->transmq); |
| 682 | if (!skb) |
| 683 | return; |
| 684 | msg = buf_msg(skb); |
| 685 | length = msg_size(msg); |
| 686 | |
| 687 | if (msg_user(msg) == MSG_FRAGMENTER) { |
| 688 | if (msg_type(msg) != FIRST_FRAGMENT) |
| 689 | return; |
| 690 | length = msg_size(msg_get_wrapped(msg)); |
| 691 | } |
| 692 | l->stats.msg_lengths_total += length; |
| 693 | l->stats.msg_length_counts++; |
| 694 | if (length <= 64) |
| 695 | l->stats.msg_length_profile[0]++; |
| 696 | else if (length <= 256) |
| 697 | l->stats.msg_length_profile[1]++; |
| 698 | else if (length <= 1024) |
| 699 | l->stats.msg_length_profile[2]++; |
| 700 | else if (length <= 4096) |
| 701 | l->stats.msg_length_profile[3]++; |
| 702 | else if (length <= 16384) |
| 703 | l->stats.msg_length_profile[4]++; |
| 704 | else if (length <= 32768) |
| 705 | l->stats.msg_length_profile[5]++; |
| 706 | else |
| 707 | l->stats.msg_length_profile[6]++; |
| 708 | } |
| 709 | |
| 710 | /* tipc_link_timeout - perform periodic task as instructed from node timeout |
| 711 | */ |
Jon Paul Maloy | 5266698 | 2015-10-22 08:51:41 -0400 | [diff] [blame] | 712 | /* tipc_link_timeout - perform periodic task as instructed from node timeout |
| 713 | */ |
Jon Paul Maloy | 333ef69 | 2015-07-16 16:54:28 -0400 | [diff] [blame] | 714 | int tipc_link_timeout(struct tipc_link *l, struct sk_buff_head *xmitq) |
| 715 | { |
| 716 | int rc = 0; |
Jon Paul Maloy | 5045f7b | 2015-07-30 18:24:20 -0400 | [diff] [blame] | 717 | int mtyp = STATE_MSG; |
| 718 | bool xmit = false; |
| 719 | bool prb = false; |
Jon Paul Maloy | 5266698 | 2015-10-22 08:51:41 -0400 | [diff] [blame] | 720 | u16 bc_snt = l->bc_sndlink->snd_nxt - 1; |
| 721 | u16 bc_acked = l->bc_rcvlink->acked; |
| 722 | bool bc_up = link_is_up(l->bc_rcvlink); |
Jon Paul Maloy | 333ef69 | 2015-07-16 16:54:28 -0400 | [diff] [blame] | 723 | |
| 724 | link_profile_stats(l); |
Jon Paul Maloy | 5045f7b | 2015-07-30 18:24:20 -0400 | [diff] [blame] | 725 | |
Jon Paul Maloy | 662921c | 2015-07-30 18:24:21 -0400 | [diff] [blame] | 726 | switch (l->state) { |
| 727 | case LINK_ESTABLISHED: |
| 728 | case LINK_SYNCHING: |
Jon Paul Maloy | 5045f7b | 2015-07-30 18:24:20 -0400 | [diff] [blame] | 729 | if (!l->silent_intv_cnt) { |
Jon Paul Maloy | 5266698 | 2015-10-22 08:51:41 -0400 | [diff] [blame] | 730 | if (bc_up && (bc_acked != bc_snt)) |
Jon Paul Maloy | 5045f7b | 2015-07-30 18:24:20 -0400 | [diff] [blame] | 731 | xmit = true; |
| 732 | } else if (l->silent_intv_cnt <= l->abort_limit) { |
| 733 | xmit = true; |
| 734 | prb = true; |
| 735 | } else { |
Jon Paul Maloy | 662921c | 2015-07-30 18:24:21 -0400 | [diff] [blame] | 736 | rc |= tipc_link_fsm_evt(l, LINK_FAILURE_EVT); |
Jon Paul Maloy | 5045f7b | 2015-07-30 18:24:20 -0400 | [diff] [blame] | 737 | } |
| 738 | l->silent_intv_cnt++; |
Jon Paul Maloy | 662921c | 2015-07-30 18:24:21 -0400 | [diff] [blame] | 739 | break; |
| 740 | case LINK_RESET: |
Jon Paul Maloy | 5045f7b | 2015-07-30 18:24:20 -0400 | [diff] [blame] | 741 | xmit = true; |
| 742 | mtyp = RESET_MSG; |
Jon Paul Maloy | 662921c | 2015-07-30 18:24:21 -0400 | [diff] [blame] | 743 | break; |
| 744 | case LINK_ESTABLISHING: |
Jon Paul Maloy | 5045f7b | 2015-07-30 18:24:20 -0400 | [diff] [blame] | 745 | xmit = true; |
| 746 | mtyp = ACTIVATE_MSG; |
Jon Paul Maloy | 662921c | 2015-07-30 18:24:21 -0400 | [diff] [blame] | 747 | break; |
Jon Paul Maloy | 662921c | 2015-07-30 18:24:21 -0400 | [diff] [blame] | 748 | case LINK_PEER_RESET: |
Jon Paul Maloy | 598411d | 2015-07-30 18:24:23 -0400 | [diff] [blame] | 749 | case LINK_RESETTING: |
Jon Paul Maloy | 662921c | 2015-07-30 18:24:21 -0400 | [diff] [blame] | 750 | case LINK_FAILINGOVER: |
| 751 | break; |
| 752 | default: |
| 753 | break; |
Jon Paul Maloy | 5045f7b | 2015-07-30 18:24:20 -0400 | [diff] [blame] | 754 | } |
Jon Paul Maloy | 662921c | 2015-07-30 18:24:21 -0400 | [diff] [blame] | 755 | |
Jon Paul Maloy | 5045f7b | 2015-07-30 18:24:20 -0400 | [diff] [blame] | 756 | if (xmit) |
| 757 | tipc_link_build_proto_msg(l, mtyp, prb, 0, 0, 0, xmitq); |
| 758 | |
Jon Paul Maloy | 333ef69 | 2015-07-16 16:54:28 -0400 | [diff] [blame] | 759 | return rc; |
| 760 | } |
| 761 | |
Jon Paul Maloy | 6ab30f9 | 2015-07-16 16:54:27 -0400 | [diff] [blame] | 762 | /** |
Jon Paul Maloy | 3127a02 | 2015-03-25 12:07:25 -0400 | [diff] [blame] | 763 | * link_schedule_user - schedule a message sender for wakeup after congestion |
Jon Paul Maloy | 50100a5 | 2014-08-22 18:09:07 -0400 | [diff] [blame] | 764 | * @link: congested link |
Jon Paul Maloy | 3127a02 | 2015-03-25 12:07:25 -0400 | [diff] [blame] | 765 | * @list: message that was attempted sent |
Jon Paul Maloy | 50100a5 | 2014-08-22 18:09:07 -0400 | [diff] [blame] | 766 | * Create pseudo msg to send back to user when congestion abates |
Jon Paul Maloy | 22d85c7 | 2015-07-16 16:54:23 -0400 | [diff] [blame] | 767 | * Does not consume buffer list |
Per Liden | b97bf3f | 2006-01-02 19:04:38 +0100 | [diff] [blame] | 768 | */ |
Jon Paul Maloy | 3127a02 | 2015-03-25 12:07:25 -0400 | [diff] [blame] | 769 | static int link_schedule_user(struct tipc_link *link, struct sk_buff_head *list) |
Per Liden | b97bf3f | 2006-01-02 19:04:38 +0100 | [diff] [blame] | 770 | { |
Jon Paul Maloy | 3127a02 | 2015-03-25 12:07:25 -0400 | [diff] [blame] | 771 | struct tipc_msg *msg = buf_msg(skb_peek(list)); |
| 772 | int imp = msg_importance(msg); |
| 773 | u32 oport = msg_origport(msg); |
Jon Paul Maloy | e74a386 | 2016-03-03 14:23:21 -0500 | [diff] [blame^] | 774 | u32 addr = tipc_own_addr(link->net); |
Jon Paul Maloy | 3127a02 | 2015-03-25 12:07:25 -0400 | [diff] [blame] | 775 | struct sk_buff *skb; |
Per Liden | b97bf3f | 2006-01-02 19:04:38 +0100 | [diff] [blame] | 776 | |
Jon Paul Maloy | 3127a02 | 2015-03-25 12:07:25 -0400 | [diff] [blame] | 777 | /* This really cannot happen... */ |
| 778 | if (unlikely(imp > TIPC_CRITICAL_IMPORTANCE)) { |
| 779 | pr_warn("%s<%s>, send queue full", link_rst_msg, link->name); |
Jon Paul Maloy | 22d85c7 | 2015-07-16 16:54:23 -0400 | [diff] [blame] | 780 | return -ENOBUFS; |
Jon Paul Maloy | 3127a02 | 2015-03-25 12:07:25 -0400 | [diff] [blame] | 781 | } |
| 782 | /* Non-blocking sender: */ |
| 783 | if (TIPC_SKB_CB(skb_peek(list))->wakeup_pending) |
| 784 | return -ELINKCONG; |
| 785 | |
| 786 | /* Create and schedule wakeup pseudo message */ |
| 787 | skb = tipc_msg_create(SOCK_WAKEUP, 0, INT_H_SIZE, 0, |
| 788 | addr, addr, oport, 0, 0); |
| 789 | if (!skb) |
Jon Paul Maloy | 22d85c7 | 2015-07-16 16:54:23 -0400 | [diff] [blame] | 790 | return -ENOBUFS; |
Jon Paul Maloy | 3127a02 | 2015-03-25 12:07:25 -0400 | [diff] [blame] | 791 | TIPC_SKB_CB(skb)->chain_sz = skb_queue_len(list); |
| 792 | TIPC_SKB_CB(skb)->chain_imp = imp; |
| 793 | skb_queue_tail(&link->wakeupq, skb); |
Jon Paul Maloy | 50100a5 | 2014-08-22 18:09:07 -0400 | [diff] [blame] | 794 | link->stats.link_congs++; |
Jon Paul Maloy | 3127a02 | 2015-03-25 12:07:25 -0400 | [diff] [blame] | 795 | return -ELINKCONG; |
Per Liden | b97bf3f | 2006-01-02 19:04:38 +0100 | [diff] [blame] | 796 | } |
| 797 | |
Jon Paul Maloy | 50100a5 | 2014-08-22 18:09:07 -0400 | [diff] [blame] | 798 | /** |
| 799 | * link_prepare_wakeup - prepare users for wakeup after congestion |
| 800 | * @link: congested link |
| 801 | * Move a number of waiting users, as permitted by available space in |
| 802 | * the send queue, from link wait queue to node wait queue for wakeup |
| 803 | */ |
Jon Paul Maloy | 1f66d16 | 2015-03-25 12:07:24 -0400 | [diff] [blame] | 804 | void link_prepare_wakeup(struct tipc_link *l) |
Per Liden | b97bf3f | 2006-01-02 19:04:38 +0100 | [diff] [blame] | 805 | { |
Jon Paul Maloy | 1f66d16 | 2015-03-25 12:07:24 -0400 | [diff] [blame] | 806 | int pnd[TIPC_SYSTEM_IMPORTANCE + 1] = {0,}; |
| 807 | int imp, lim; |
Ying Xue | 58d78b3 | 2014-11-26 11:41:51 +0800 | [diff] [blame] | 808 | struct sk_buff *skb, *tmp; |
Per Liden | b97bf3f | 2006-01-02 19:04:38 +0100 | [diff] [blame] | 809 | |
Jon Paul Maloy | 1f66d16 | 2015-03-25 12:07:24 -0400 | [diff] [blame] | 810 | skb_queue_walk_safe(&l->wakeupq, skb, tmp) { |
| 811 | imp = TIPC_SKB_CB(skb)->chain_imp; |
| 812 | lim = l->window + l->backlog[imp].limit; |
| 813 | pnd[imp] += TIPC_SKB_CB(skb)->chain_sz; |
| 814 | if ((pnd[imp] + l->backlog[imp].len) >= lim) |
Per Liden | b97bf3f | 2006-01-02 19:04:38 +0100 | [diff] [blame] | 815 | break; |
Jon Paul Maloy | 1f66d16 | 2015-03-25 12:07:24 -0400 | [diff] [blame] | 816 | skb_unlink(skb, &l->wakeupq); |
Jon Paul Maloy | d39bbd4 | 2015-07-16 16:54:21 -0400 | [diff] [blame] | 817 | skb_queue_tail(l->inputq, skb); |
Per Liden | b97bf3f | 2006-01-02 19:04:38 +0100 | [diff] [blame] | 818 | } |
Per Liden | b97bf3f | 2006-01-02 19:04:38 +0100 | [diff] [blame] | 819 | } |
| 820 | |
Jon Paul Maloy | 6e49815 | 2015-07-30 18:24:19 -0400 | [diff] [blame] | 821 | void tipc_link_reset(struct tipc_link *l) |
Per Liden | b97bf3f | 2006-01-02 19:04:38 +0100 | [diff] [blame] | 822 | { |
Jon Paul Maloy | e74a386 | 2016-03-03 14:23:21 -0500 | [diff] [blame^] | 823 | l->peer_session = ANY_SESSION; |
| 824 | l->session++; |
Jon Paul Maloy | 6e49815 | 2015-07-30 18:24:19 -0400 | [diff] [blame] | 825 | l->mtu = l->advertised_mtu; |
Jon Paul Maloy | 6e49815 | 2015-07-30 18:24:19 -0400 | [diff] [blame] | 826 | __skb_queue_purge(&l->transmq); |
| 827 | __skb_queue_purge(&l->deferdq); |
Jon Paul Maloy | 23d8335 | 2015-07-30 18:24:24 -0400 | [diff] [blame] | 828 | skb_queue_splice_init(&l->wakeupq, l->inputq); |
Jon Paul Maloy | 2af5ae3 | 2015-10-22 08:51:48 -0400 | [diff] [blame] | 829 | __skb_queue_purge(&l->backlogq); |
| 830 | l->backlog[TIPC_LOW_IMPORTANCE].len = 0; |
| 831 | l->backlog[TIPC_MEDIUM_IMPORTANCE].len = 0; |
| 832 | l->backlog[TIPC_HIGH_IMPORTANCE].len = 0; |
| 833 | l->backlog[TIPC_CRITICAL_IMPORTANCE].len = 0; |
| 834 | l->backlog[TIPC_SYSTEM_IMPORTANCE].len = 0; |
Jon Paul Maloy | 6e49815 | 2015-07-30 18:24:19 -0400 | [diff] [blame] | 835 | kfree_skb(l->reasm_buf); |
| 836 | kfree_skb(l->failover_reasm_skb); |
| 837 | l->reasm_buf = NULL; |
| 838 | l->failover_reasm_skb = NULL; |
| 839 | l->rcv_unacked = 0; |
| 840 | l->snd_nxt = 1; |
| 841 | l->rcv_nxt = 1; |
Jon Paul Maloy | c1ab3f1d | 2015-10-22 08:51:38 -0400 | [diff] [blame] | 842 | l->acked = 0; |
Jon Paul Maloy | 6e49815 | 2015-07-30 18:24:19 -0400 | [diff] [blame] | 843 | l->silent_intv_cnt = 0; |
| 844 | l->stats.recv_info = 0; |
| 845 | l->stale_count = 0; |
Jon Paul Maloy | 5266698 | 2015-10-22 08:51:41 -0400 | [diff] [blame] | 846 | l->bc_peer_is_up = false; |
Jon Paul Maloy | 38206d5 | 2015-11-19 14:30:46 -0500 | [diff] [blame] | 847 | tipc_link_reset_stats(l); |
Per Liden | b97bf3f | 2006-01-02 19:04:38 +0100 | [diff] [blame] | 848 | } |
| 849 | |
Per Liden | b97bf3f | 2006-01-02 19:04:38 +0100 | [diff] [blame] | 850 | /** |
Jon Paul Maloy | af9b028 | 2015-07-16 16:54:24 -0400 | [diff] [blame] | 851 | * tipc_link_xmit(): enqueue buffer list according to queue situation |
| 852 | * @link: link to use |
| 853 | * @list: chain of buffers containing message |
| 854 | * @xmitq: returned list of packets to be sent by caller |
| 855 | * |
| 856 | * Consumes the buffer chain, except when returning -ELINKCONG, |
| 857 | * since the caller then may want to make more send attempts. |
| 858 | * Returns 0 if success, or errno: -ELINKCONG, -EMSGSIZE or -ENOBUFS |
| 859 | * Messages at TIPC_SYSTEM_IMPORTANCE are always accepted |
| 860 | */ |
| 861 | int tipc_link_xmit(struct tipc_link *l, struct sk_buff_head *list, |
| 862 | struct sk_buff_head *xmitq) |
| 863 | { |
| 864 | struct tipc_msg *hdr = buf_msg(skb_peek(list)); |
| 865 | unsigned int maxwin = l->window; |
| 866 | unsigned int i, imp = msg_importance(hdr); |
| 867 | unsigned int mtu = l->mtu; |
| 868 | u16 ack = l->rcv_nxt - 1; |
| 869 | u16 seqno = l->snd_nxt; |
Jon Paul Maloy | 5266698 | 2015-10-22 08:51:41 -0400 | [diff] [blame] | 870 | u16 bc_ack = l->bc_rcvlink->rcv_nxt - 1; |
Jon Paul Maloy | af9b028 | 2015-07-16 16:54:24 -0400 | [diff] [blame] | 871 | struct sk_buff_head *transmq = &l->transmq; |
| 872 | struct sk_buff_head *backlogq = &l->backlogq; |
| 873 | struct sk_buff *skb, *_skb, *bskb; |
| 874 | |
| 875 | /* Match msg importance against this and all higher backlog limits: */ |
| 876 | for (i = imp; i <= TIPC_SYSTEM_IMPORTANCE; i++) { |
| 877 | if (unlikely(l->backlog[i].len >= l->backlog[i].limit)) |
| 878 | return link_schedule_user(l, list); |
| 879 | } |
Richard Alpe | 4952cd3 | 2016-02-11 10:43:15 +0100 | [diff] [blame] | 880 | if (unlikely(msg_size(hdr) > mtu)) { |
| 881 | skb_queue_purge(list); |
Jon Paul Maloy | af9b028 | 2015-07-16 16:54:24 -0400 | [diff] [blame] | 882 | return -EMSGSIZE; |
Richard Alpe | 4952cd3 | 2016-02-11 10:43:15 +0100 | [diff] [blame] | 883 | } |
Jon Paul Maloy | af9b028 | 2015-07-16 16:54:24 -0400 | [diff] [blame] | 884 | |
| 885 | /* Prepare each packet for sending, and add to relevant queue: */ |
| 886 | while (skb_queue_len(list)) { |
| 887 | skb = skb_peek(list); |
| 888 | hdr = buf_msg(skb); |
| 889 | msg_set_seqno(hdr, seqno); |
| 890 | msg_set_ack(hdr, ack); |
Jon Paul Maloy | 5266698 | 2015-10-22 08:51:41 -0400 | [diff] [blame] | 891 | msg_set_bcast_ack(hdr, bc_ack); |
Jon Paul Maloy | af9b028 | 2015-07-16 16:54:24 -0400 | [diff] [blame] | 892 | |
| 893 | if (likely(skb_queue_len(transmq) < maxwin)) { |
| 894 | _skb = skb_clone(skb, GFP_ATOMIC); |
Richard Alpe | 4952cd3 | 2016-02-11 10:43:15 +0100 | [diff] [blame] | 895 | if (!_skb) { |
| 896 | skb_queue_purge(list); |
Jon Paul Maloy | af9b028 | 2015-07-16 16:54:24 -0400 | [diff] [blame] | 897 | return -ENOBUFS; |
Richard Alpe | 4952cd3 | 2016-02-11 10:43:15 +0100 | [diff] [blame] | 898 | } |
Jon Paul Maloy | af9b028 | 2015-07-16 16:54:24 -0400 | [diff] [blame] | 899 | __skb_dequeue(list); |
| 900 | __skb_queue_tail(transmq, skb); |
| 901 | __skb_queue_tail(xmitq, _skb); |
Jon Paul Maloy | c1ab3f1d | 2015-10-22 08:51:38 -0400 | [diff] [blame] | 902 | TIPC_SKB_CB(skb)->ackers = l->ackers; |
Jon Paul Maloy | af9b028 | 2015-07-16 16:54:24 -0400 | [diff] [blame] | 903 | l->rcv_unacked = 0; |
| 904 | seqno++; |
| 905 | continue; |
| 906 | } |
| 907 | if (tipc_msg_bundle(skb_peek_tail(backlogq), hdr, mtu)) { |
| 908 | kfree_skb(__skb_dequeue(list)); |
| 909 | l->stats.sent_bundled++; |
| 910 | continue; |
| 911 | } |
| 912 | if (tipc_msg_make_bundle(&bskb, hdr, mtu, l->addr)) { |
| 913 | kfree_skb(__skb_dequeue(list)); |
| 914 | __skb_queue_tail(backlogq, bskb); |
| 915 | l->backlog[msg_importance(buf_msg(bskb))].len++; |
| 916 | l->stats.sent_bundled++; |
| 917 | l->stats.sent_bundles++; |
| 918 | continue; |
| 919 | } |
| 920 | l->backlog[imp].len += skb_queue_len(list); |
| 921 | skb_queue_splice_tail_init(list, backlogq); |
| 922 | } |
| 923 | l->snd_nxt = seqno; |
| 924 | return 0; |
| 925 | } |
| 926 | |
Jon Paul Maloy | d999297 | 2015-07-16 16:54:31 -0400 | [diff] [blame] | 927 | void tipc_link_advance_backlog(struct tipc_link *l, struct sk_buff_head *xmitq) |
| 928 | { |
| 929 | struct sk_buff *skb, *_skb; |
| 930 | struct tipc_msg *hdr; |
| 931 | u16 seqno = l->snd_nxt; |
| 932 | u16 ack = l->rcv_nxt - 1; |
Jon Paul Maloy | 5266698 | 2015-10-22 08:51:41 -0400 | [diff] [blame] | 933 | u16 bc_ack = l->bc_rcvlink->rcv_nxt - 1; |
Jon Paul Maloy | d999297 | 2015-07-16 16:54:31 -0400 | [diff] [blame] | 934 | |
| 935 | while (skb_queue_len(&l->transmq) < l->window) { |
| 936 | skb = skb_peek(&l->backlogq); |
| 937 | if (!skb) |
| 938 | break; |
| 939 | _skb = skb_clone(skb, GFP_ATOMIC); |
| 940 | if (!_skb) |
| 941 | break; |
| 942 | __skb_dequeue(&l->backlogq); |
| 943 | hdr = buf_msg(skb); |
| 944 | l->backlog[msg_importance(hdr)].len--; |
| 945 | __skb_queue_tail(&l->transmq, skb); |
| 946 | __skb_queue_tail(xmitq, _skb); |
Jon Paul Maloy | c1ab3f1d | 2015-10-22 08:51:38 -0400 | [diff] [blame] | 947 | TIPC_SKB_CB(skb)->ackers = l->ackers; |
Jon Paul Maloy | d999297 | 2015-07-16 16:54:31 -0400 | [diff] [blame] | 948 | msg_set_seqno(hdr, seqno); |
Jon Paul Maloy | 5266698 | 2015-10-22 08:51:41 -0400 | [diff] [blame] | 949 | msg_set_ack(hdr, ack); |
| 950 | msg_set_bcast_ack(hdr, bc_ack); |
Jon Paul Maloy | d999297 | 2015-07-16 16:54:31 -0400 | [diff] [blame] | 951 | l->rcv_unacked = 0; |
| 952 | seqno++; |
| 953 | } |
| 954 | l->snd_nxt = seqno; |
| 955 | } |
| 956 | |
Jon Paul Maloy | 5266698 | 2015-10-22 08:51:41 -0400 | [diff] [blame] | 957 | static void link_retransmit_failure(struct tipc_link *l, struct sk_buff *skb) |
Allan Stephens | d356eeb | 2006-06-25 23:40:01 -0700 | [diff] [blame] | 958 | { |
Jon Paul Maloy | 5266698 | 2015-10-22 08:51:41 -0400 | [diff] [blame] | 959 | struct tipc_msg *hdr = buf_msg(skb); |
Allan Stephens | d356eeb | 2006-06-25 23:40:01 -0700 | [diff] [blame] | 960 | |
Jon Paul Maloy | 5266698 | 2015-10-22 08:51:41 -0400 | [diff] [blame] | 961 | pr_warn("Retransmission failure on link <%s>\n", l->name); |
| 962 | link_print(l, "Resetting link "); |
| 963 | pr_info("Failed msg: usr %u, typ %u, len %u, err %u\n", |
| 964 | msg_user(hdr), msg_type(hdr), msg_size(hdr), msg_errcode(hdr)); |
| 965 | pr_info("sqno %u, prev: %x, src: %x\n", |
| 966 | msg_seqno(hdr), msg_prevnode(hdr), msg_orignode(hdr)); |
Allan Stephens | d356eeb | 2006-06-25 23:40:01 -0700 | [diff] [blame] | 967 | } |
| 968 | |
Jon Paul Maloy | c1ab3f1d | 2015-10-22 08:51:38 -0400 | [diff] [blame] | 969 | int tipc_link_retrans(struct tipc_link *l, u16 from, u16 to, |
| 970 | struct sk_buff_head *xmitq) |
Jon Paul Maloy | d999297 | 2015-07-16 16:54:31 -0400 | [diff] [blame] | 971 | { |
| 972 | struct sk_buff *_skb, *skb = skb_peek(&l->transmq); |
| 973 | struct tipc_msg *hdr; |
Jon Paul Maloy | c1ab3f1d | 2015-10-22 08:51:38 -0400 | [diff] [blame] | 974 | u16 ack = l->rcv_nxt - 1; |
Jon Paul Maloy | 5266698 | 2015-10-22 08:51:41 -0400 | [diff] [blame] | 975 | u16 bc_ack = l->bc_rcvlink->rcv_nxt - 1; |
Jon Paul Maloy | d999297 | 2015-07-16 16:54:31 -0400 | [diff] [blame] | 976 | |
| 977 | if (!skb) |
| 978 | return 0; |
| 979 | |
| 980 | /* Detect repeated retransmit failures on same packet */ |
| 981 | if (likely(l->last_retransm != buf_seqno(skb))) { |
| 982 | l->last_retransm = buf_seqno(skb); |
| 983 | l->stale_count = 1; |
| 984 | } else if (++l->stale_count > 100) { |
| 985 | link_retransmit_failure(l, skb); |
Jon Paul Maloy | 662921c | 2015-07-30 18:24:21 -0400 | [diff] [blame] | 986 | return tipc_link_fsm_evt(l, LINK_FAILURE_EVT); |
Jon Paul Maloy | d999297 | 2015-07-16 16:54:31 -0400 | [diff] [blame] | 987 | } |
Jon Paul Maloy | c1ab3f1d | 2015-10-22 08:51:38 -0400 | [diff] [blame] | 988 | |
| 989 | /* Move forward to where retransmission should start */ |
Jon Paul Maloy | d999297 | 2015-07-16 16:54:31 -0400 | [diff] [blame] | 990 | skb_queue_walk(&l->transmq, skb) { |
Jon Paul Maloy | c1ab3f1d | 2015-10-22 08:51:38 -0400 | [diff] [blame] | 991 | if (!less(buf_seqno(skb), from)) |
| 992 | break; |
| 993 | } |
| 994 | |
| 995 | skb_queue_walk_from(&l->transmq, skb) { |
| 996 | if (more(buf_seqno(skb), to)) |
| 997 | break; |
Jon Paul Maloy | d999297 | 2015-07-16 16:54:31 -0400 | [diff] [blame] | 998 | hdr = buf_msg(skb); |
| 999 | _skb = __pskb_copy(skb, MIN_H_SIZE, GFP_ATOMIC); |
| 1000 | if (!_skb) |
| 1001 | return 0; |
| 1002 | hdr = buf_msg(_skb); |
Jon Paul Maloy | c1ab3f1d | 2015-10-22 08:51:38 -0400 | [diff] [blame] | 1003 | msg_set_ack(hdr, ack); |
| 1004 | msg_set_bcast_ack(hdr, bc_ack); |
Jon Paul Maloy | d999297 | 2015-07-16 16:54:31 -0400 | [diff] [blame] | 1005 | _skb->priority = TC_PRIO_CONTROL; |
| 1006 | __skb_queue_tail(xmitq, _skb); |
Jon Paul Maloy | d999297 | 2015-07-16 16:54:31 -0400 | [diff] [blame] | 1007 | l->stats.retransmitted++; |
| 1008 | } |
| 1009 | return 0; |
| 1010 | } |
| 1011 | |
Jon Paul Maloy | c637c10 | 2015-02-05 08:36:41 -0500 | [diff] [blame] | 1012 | /* tipc_data_input - deliver data and name distr msgs to upper layer |
Erik Hugne | 7ae934b | 2014-07-01 10:22:40 +0200 | [diff] [blame] | 1013 | * |
Jon Paul Maloy | c637c10 | 2015-02-05 08:36:41 -0500 | [diff] [blame] | 1014 | * Consumes buffer if message is of right type |
Erik Hugne | 7ae934b | 2014-07-01 10:22:40 +0200 | [diff] [blame] | 1015 | * Node lock must be held |
| 1016 | */ |
Jon Paul Maloy | 5266698 | 2015-10-22 08:51:41 -0400 | [diff] [blame] | 1017 | static bool tipc_data_input(struct tipc_link *l, struct sk_buff *skb, |
Jon Paul Maloy | 9073fb8 | 2015-07-30 18:24:25 -0400 | [diff] [blame] | 1018 | struct sk_buff_head *inputq) |
Erik Hugne | 7ae934b | 2014-07-01 10:22:40 +0200 | [diff] [blame] | 1019 | { |
Jon Paul Maloy | 9073fb8 | 2015-07-30 18:24:25 -0400 | [diff] [blame] | 1020 | switch (msg_user(buf_msg(skb))) { |
Erik Hugne | 7ae934b | 2014-07-01 10:22:40 +0200 | [diff] [blame] | 1021 | case TIPC_LOW_IMPORTANCE: |
| 1022 | case TIPC_MEDIUM_IMPORTANCE: |
| 1023 | case TIPC_HIGH_IMPORTANCE: |
| 1024 | case TIPC_CRITICAL_IMPORTANCE: |
| 1025 | case CONN_MANAGER: |
Jon Paul Maloy | 9945e80 | 2015-10-15 14:52:40 -0400 | [diff] [blame] | 1026 | skb_queue_tail(inputq, skb); |
Jon Paul Maloy | c637c10 | 2015-02-05 08:36:41 -0500 | [diff] [blame] | 1027 | return true; |
Erik Hugne | 7ae934b | 2014-07-01 10:22:40 +0200 | [diff] [blame] | 1028 | case NAME_DISTRIBUTOR: |
Jon Paul Maloy | 5266698 | 2015-10-22 08:51:41 -0400 | [diff] [blame] | 1029 | l->bc_rcvlink->state = LINK_ESTABLISHED; |
| 1030 | skb_queue_tail(l->namedq, skb); |
Jon Paul Maloy | c637c10 | 2015-02-05 08:36:41 -0500 | [diff] [blame] | 1031 | return true; |
Erik Hugne | 7ae934b | 2014-07-01 10:22:40 +0200 | [diff] [blame] | 1032 | case MSG_BUNDLER: |
Jon Paul Maloy | dff29b1 | 2015-04-02 09:33:01 -0400 | [diff] [blame] | 1033 | case TUNNEL_PROTOCOL: |
Jon Paul Maloy | c637c10 | 2015-02-05 08:36:41 -0500 | [diff] [blame] | 1034 | case MSG_FRAGMENTER: |
| 1035 | case BCAST_PROTOCOL: |
| 1036 | return false; |
| 1037 | default: |
| 1038 | pr_warn("Dropping received illegal msg type\n"); |
| 1039 | kfree_skb(skb); |
| 1040 | return false; |
| 1041 | }; |
| 1042 | } |
| 1043 | |
| 1044 | /* tipc_link_input - process packet that has passed link protocol check |
| 1045 | * |
| 1046 | * Consumes buffer |
Jon Paul Maloy | c637c10 | 2015-02-05 08:36:41 -0500 | [diff] [blame] | 1047 | */ |
Jon Paul Maloy | 9073fb8 | 2015-07-30 18:24:25 -0400 | [diff] [blame] | 1048 | static int tipc_link_input(struct tipc_link *l, struct sk_buff *skb, |
| 1049 | struct sk_buff_head *inputq) |
Jon Paul Maloy | c637c10 | 2015-02-05 08:36:41 -0500 | [diff] [blame] | 1050 | { |
Jon Paul Maloy | 6e49815 | 2015-07-30 18:24:19 -0400 | [diff] [blame] | 1051 | struct tipc_msg *hdr = buf_msg(skb); |
| 1052 | struct sk_buff **reasm_skb = &l->reasm_buf; |
Jon Paul Maloy | c637c10 | 2015-02-05 08:36:41 -0500 | [diff] [blame] | 1053 | struct sk_buff *iskb; |
Jon Paul Maloy | 9945e80 | 2015-10-15 14:52:40 -0400 | [diff] [blame] | 1054 | struct sk_buff_head tmpq; |
Jon Paul Maloy | 6e49815 | 2015-07-30 18:24:19 -0400 | [diff] [blame] | 1055 | int usr = msg_user(hdr); |
Jon Paul Maloy | 6144a99 | 2015-07-30 18:24:16 -0400 | [diff] [blame] | 1056 | int rc = 0; |
Jon Paul Maloy | 6e49815 | 2015-07-30 18:24:19 -0400 | [diff] [blame] | 1057 | int pos = 0; |
| 1058 | int ipos = 0; |
Jon Paul Maloy | c637c10 | 2015-02-05 08:36:41 -0500 | [diff] [blame] | 1059 | |
Jon Paul Maloy | 6e49815 | 2015-07-30 18:24:19 -0400 | [diff] [blame] | 1060 | if (unlikely(usr == TUNNEL_PROTOCOL)) { |
| 1061 | if (msg_type(hdr) == SYNCH_MSG) { |
| 1062 | __skb_queue_purge(&l->deferdq); |
| 1063 | goto drop; |
Jon Paul Maloy | 8b4ed86 | 2015-03-25 12:07:26 -0400 | [diff] [blame] | 1064 | } |
Jon Paul Maloy | 6e49815 | 2015-07-30 18:24:19 -0400 | [diff] [blame] | 1065 | if (!tipc_msg_extract(skb, &iskb, &ipos)) |
| 1066 | return rc; |
| 1067 | kfree_skb(skb); |
| 1068 | skb = iskb; |
| 1069 | hdr = buf_msg(skb); |
| 1070 | if (less(msg_seqno(hdr), l->drop_point)) |
| 1071 | goto drop; |
Jon Paul Maloy | 9073fb8 | 2015-07-30 18:24:25 -0400 | [diff] [blame] | 1072 | if (tipc_data_input(l, skb, inputq)) |
Jon Paul Maloy | 6e49815 | 2015-07-30 18:24:19 -0400 | [diff] [blame] | 1073 | return rc; |
| 1074 | usr = msg_user(hdr); |
| 1075 | reasm_skb = &l->failover_reasm_skb; |
| 1076 | } |
Jon Paul Maloy | c637c10 | 2015-02-05 08:36:41 -0500 | [diff] [blame] | 1077 | |
Jon Paul Maloy | 6e49815 | 2015-07-30 18:24:19 -0400 | [diff] [blame] | 1078 | if (usr == MSG_BUNDLER) { |
Jon Paul Maloy | 9945e80 | 2015-10-15 14:52:40 -0400 | [diff] [blame] | 1079 | skb_queue_head_init(&tmpq); |
Jon Paul Maloy | 6e49815 | 2015-07-30 18:24:19 -0400 | [diff] [blame] | 1080 | l->stats.recv_bundles++; |
| 1081 | l->stats.recv_bundled += msg_msgcnt(hdr); |
Jon Paul Maloy | c637c10 | 2015-02-05 08:36:41 -0500 | [diff] [blame] | 1082 | while (tipc_msg_extract(skb, &iskb, &pos)) |
Jon Paul Maloy | 9945e80 | 2015-10-15 14:52:40 -0400 | [diff] [blame] | 1083 | tipc_data_input(l, iskb, &tmpq); |
| 1084 | tipc_skb_queue_splice_tail(&tmpq, inputq); |
Jon Paul Maloy | 662921c | 2015-07-30 18:24:21 -0400 | [diff] [blame] | 1085 | return 0; |
Jon Paul Maloy | 6e49815 | 2015-07-30 18:24:19 -0400 | [diff] [blame] | 1086 | } else if (usr == MSG_FRAGMENTER) { |
| 1087 | l->stats.recv_fragments++; |
| 1088 | if (tipc_buf_append(reasm_skb, &skb)) { |
| 1089 | l->stats.recv_fragmented++; |
Jon Paul Maloy | 9073fb8 | 2015-07-30 18:24:25 -0400 | [diff] [blame] | 1090 | tipc_data_input(l, skb, inputq); |
Jon Paul Maloy | 5266698 | 2015-10-22 08:51:41 -0400 | [diff] [blame] | 1091 | } else if (!*reasm_skb && !link_is_bc_rcvlink(l)) { |
| 1092 | pr_warn_ratelimited("Unable to build fragment list\n"); |
Jon Paul Maloy | 662921c | 2015-07-30 18:24:21 -0400 | [diff] [blame] | 1093 | return tipc_link_fsm_evt(l, LINK_FAILURE_EVT); |
Jon Paul Maloy | c637c10 | 2015-02-05 08:36:41 -0500 | [diff] [blame] | 1094 | } |
Jon Paul Maloy | 662921c | 2015-07-30 18:24:21 -0400 | [diff] [blame] | 1095 | return 0; |
Jon Paul Maloy | 6e49815 | 2015-07-30 18:24:19 -0400 | [diff] [blame] | 1096 | } else if (usr == BCAST_PROTOCOL) { |
Jon Paul Maloy | c72fa87 | 2015-10-22 08:51:46 -0400 | [diff] [blame] | 1097 | tipc_bcast_lock(l->net); |
Jon Paul Maloy | 5266698 | 2015-10-22 08:51:41 -0400 | [diff] [blame] | 1098 | tipc_link_bc_init_rcv(l->bc_rcvlink, hdr); |
Jon Paul Maloy | c72fa87 | 2015-10-22 08:51:46 -0400 | [diff] [blame] | 1099 | tipc_bcast_unlock(l->net); |
Jon Paul Maloy | 6e49815 | 2015-07-30 18:24:19 -0400 | [diff] [blame] | 1100 | } |
| 1101 | drop: |
| 1102 | kfree_skb(skb); |
Jon Paul Maloy | 662921c | 2015-07-30 18:24:21 -0400 | [diff] [blame] | 1103 | return 0; |
Erik Hugne | 7ae934b | 2014-07-01 10:22:40 +0200 | [diff] [blame] | 1104 | } |
| 1105 | |
Jon Paul Maloy | d999297 | 2015-07-16 16:54:31 -0400 | [diff] [blame] | 1106 | static bool tipc_link_release_pkts(struct tipc_link *l, u16 acked) |
| 1107 | { |
| 1108 | bool released = false; |
| 1109 | struct sk_buff *skb, *tmp; |
| 1110 | |
| 1111 | skb_queue_walk_safe(&l->transmq, skb, tmp) { |
| 1112 | if (more(buf_seqno(skb), acked)) |
| 1113 | break; |
| 1114 | __skb_unlink(skb, &l->transmq); |
| 1115 | kfree_skb(skb); |
| 1116 | released = true; |
| 1117 | } |
| 1118 | return released; |
| 1119 | } |
| 1120 | |
Jon Paul Maloy | f9aa358 | 2015-10-15 14:52:41 -0400 | [diff] [blame] | 1121 | /* tipc_link_build_ack_msg: prepare link acknowledge message for transmission |
Jon Paul Maloy | 5266698 | 2015-10-22 08:51:41 -0400 | [diff] [blame] | 1122 | * |
| 1123 | * Note that sending of broadcast ack is coordinated among nodes, to reduce |
| 1124 | * risk of ack storms towards the sender |
Jon Paul Maloy | f9aa358 | 2015-10-15 14:52:41 -0400 | [diff] [blame] | 1125 | */ |
Jon Paul Maloy | 5266698 | 2015-10-22 08:51:41 -0400 | [diff] [blame] | 1126 | int tipc_link_build_ack_msg(struct tipc_link *l, struct sk_buff_head *xmitq) |
Jon Paul Maloy | f9aa358 | 2015-10-15 14:52:41 -0400 | [diff] [blame] | 1127 | { |
Jon Paul Maloy | 5266698 | 2015-10-22 08:51:41 -0400 | [diff] [blame] | 1128 | if (!l) |
| 1129 | return 0; |
| 1130 | |
| 1131 | /* Broadcast ACK must be sent via a unicast link => defer to caller */ |
| 1132 | if (link_is_bc_rcvlink(l)) { |
Jon Paul Maloy | e74a386 | 2016-03-03 14:23:21 -0500 | [diff] [blame^] | 1133 | if (((l->rcv_nxt ^ tipc_own_addr(l->net)) & 0xf) != 0xf) |
Jon Paul Maloy | 5266698 | 2015-10-22 08:51:41 -0400 | [diff] [blame] | 1134 | return 0; |
| 1135 | l->rcv_unacked = 0; |
| 1136 | return TIPC_LINK_SND_BC_ACK; |
| 1137 | } |
| 1138 | |
| 1139 | /* Unicast ACK */ |
Jon Paul Maloy | f9aa358 | 2015-10-15 14:52:41 -0400 | [diff] [blame] | 1140 | l->rcv_unacked = 0; |
| 1141 | l->stats.sent_acks++; |
| 1142 | tipc_link_build_proto_msg(l, STATE_MSG, 0, 0, 0, 0, xmitq); |
Jon Paul Maloy | 5266698 | 2015-10-22 08:51:41 -0400 | [diff] [blame] | 1143 | return 0; |
Jon Paul Maloy | f9aa358 | 2015-10-15 14:52:41 -0400 | [diff] [blame] | 1144 | } |
| 1145 | |
Jon Paul Maloy | 282b3a0 | 2015-10-15 14:52:45 -0400 | [diff] [blame] | 1146 | /* tipc_link_build_reset_msg: prepare link RESET or ACTIVATE message |
| 1147 | */ |
| 1148 | void tipc_link_build_reset_msg(struct tipc_link *l, struct sk_buff_head *xmitq) |
| 1149 | { |
| 1150 | int mtyp = RESET_MSG; |
| 1151 | |
| 1152 | if (l->state == LINK_ESTABLISHING) |
| 1153 | mtyp = ACTIVATE_MSG; |
| 1154 | |
| 1155 | tipc_link_build_proto_msg(l, mtyp, 0, 0, 0, 0, xmitq); |
| 1156 | } |
| 1157 | |
Jon Paul Maloy | f9aa358 | 2015-10-15 14:52:41 -0400 | [diff] [blame] | 1158 | /* tipc_link_build_nack_msg: prepare link nack message for transmission |
| 1159 | */ |
| 1160 | static void tipc_link_build_nack_msg(struct tipc_link *l, |
| 1161 | struct sk_buff_head *xmitq) |
| 1162 | { |
| 1163 | u32 def_cnt = ++l->stats.deferred_recv; |
| 1164 | |
Jon Paul Maloy | 5266698 | 2015-10-22 08:51:41 -0400 | [diff] [blame] | 1165 | if (link_is_bc_rcvlink(l)) |
| 1166 | return; |
| 1167 | |
Jon Paul Maloy | f9aa358 | 2015-10-15 14:52:41 -0400 | [diff] [blame] | 1168 | if ((skb_queue_len(&l->deferdq) == 1) || !(def_cnt % TIPC_NACK_INTV)) |
| 1169 | tipc_link_build_proto_msg(l, STATE_MSG, 0, 0, 0, 0, xmitq); |
| 1170 | } |
| 1171 | |
Jon Paul Maloy | d999297 | 2015-07-16 16:54:31 -0400 | [diff] [blame] | 1172 | /* tipc_link_rcv - process TIPC packets/messages arriving from off-node |
Jon Paul Maloy | f9aa358 | 2015-10-15 14:52:41 -0400 | [diff] [blame] | 1173 | * @l: the link that should handle the message |
Jon Paul Maloy | d999297 | 2015-07-16 16:54:31 -0400 | [diff] [blame] | 1174 | * @skb: TIPC packet |
| 1175 | * @xmitq: queue to place packets to be sent after this call |
| 1176 | */ |
| 1177 | int tipc_link_rcv(struct tipc_link *l, struct sk_buff *skb, |
| 1178 | struct sk_buff_head *xmitq) |
| 1179 | { |
Jon Paul Maloy | f9aa358 | 2015-10-15 14:52:41 -0400 | [diff] [blame] | 1180 | struct sk_buff_head *defq = &l->deferdq; |
Jon Paul Maloy | d999297 | 2015-07-16 16:54:31 -0400 | [diff] [blame] | 1181 | struct tipc_msg *hdr; |
Jon Paul Maloy | 81204c4 | 2015-10-15 14:52:42 -0400 | [diff] [blame] | 1182 | u16 seqno, rcv_nxt, win_lim; |
Jon Paul Maloy | d999297 | 2015-07-16 16:54:31 -0400 | [diff] [blame] | 1183 | int rc = 0; |
| 1184 | |
Jon Paul Maloy | f9aa358 | 2015-10-15 14:52:41 -0400 | [diff] [blame] | 1185 | do { |
Jon Paul Maloy | d999297 | 2015-07-16 16:54:31 -0400 | [diff] [blame] | 1186 | hdr = buf_msg(skb); |
Jon Paul Maloy | f9aa358 | 2015-10-15 14:52:41 -0400 | [diff] [blame] | 1187 | seqno = msg_seqno(hdr); |
| 1188 | rcv_nxt = l->rcv_nxt; |
Jon Paul Maloy | 81204c4 | 2015-10-15 14:52:42 -0400 | [diff] [blame] | 1189 | win_lim = rcv_nxt + TIPC_MAX_LINK_WIN; |
Jon Paul Maloy | d999297 | 2015-07-16 16:54:31 -0400 | [diff] [blame] | 1190 | |
| 1191 | /* Verify and update link state */ |
Jon Paul Maloy | f9aa358 | 2015-10-15 14:52:41 -0400 | [diff] [blame] | 1192 | if (unlikely(msg_user(hdr) == LINK_PROTOCOL)) |
| 1193 | return tipc_link_proto_rcv(l, skb, xmitq); |
Jon Paul Maloy | d999297 | 2015-07-16 16:54:31 -0400 | [diff] [blame] | 1194 | |
Jon Paul Maloy | 662921c | 2015-07-30 18:24:21 -0400 | [diff] [blame] | 1195 | if (unlikely(!link_is_up(l))) { |
Jon Paul Maloy | 73f646c | 2015-10-15 14:52:44 -0400 | [diff] [blame] | 1196 | if (l->state == LINK_ESTABLISHING) |
| 1197 | rc = TIPC_LINK_UP_EVT; |
| 1198 | goto drop; |
Jon Paul Maloy | d999297 | 2015-07-16 16:54:31 -0400 | [diff] [blame] | 1199 | } |
| 1200 | |
Jon Paul Maloy | f9aa358 | 2015-10-15 14:52:41 -0400 | [diff] [blame] | 1201 | /* Don't send probe at next timeout expiration */ |
Jon Paul Maloy | d999297 | 2015-07-16 16:54:31 -0400 | [diff] [blame] | 1202 | l->silent_intv_cnt = 0; |
| 1203 | |
Jon Paul Maloy | 81204c4 | 2015-10-15 14:52:42 -0400 | [diff] [blame] | 1204 | /* Drop if outside receive window */ |
| 1205 | if (unlikely(less(seqno, rcv_nxt) || more(seqno, win_lim))) { |
| 1206 | l->stats.duplicates++; |
| 1207 | goto drop; |
| 1208 | } |
| 1209 | |
Jon Paul Maloy | d999297 | 2015-07-16 16:54:31 -0400 | [diff] [blame] | 1210 | /* Forward queues and wake up waiting users */ |
| 1211 | if (likely(tipc_link_release_pkts(l, msg_ack(hdr)))) { |
| 1212 | tipc_link_advance_backlog(l, xmitq); |
| 1213 | if (unlikely(!skb_queue_empty(&l->wakeupq))) |
| 1214 | link_prepare_wakeup(l); |
| 1215 | } |
| 1216 | |
Jon Paul Maloy | 81204c4 | 2015-10-15 14:52:42 -0400 | [diff] [blame] | 1217 | /* Defer delivery if sequence gap */ |
| 1218 | if (unlikely(seqno != rcv_nxt)) { |
Jon Paul Maloy | 8306f99 | 2015-10-15 14:52:43 -0400 | [diff] [blame] | 1219 | __tipc_skb_queue_sorted(defq, seqno, skb); |
Jon Paul Maloy | f9aa358 | 2015-10-15 14:52:41 -0400 | [diff] [blame] | 1220 | tipc_link_build_nack_msg(l, xmitq); |
| 1221 | break; |
Jon Paul Maloy | d999297 | 2015-07-16 16:54:31 -0400 | [diff] [blame] | 1222 | } |
| 1223 | |
Jon Paul Maloy | 81204c4 | 2015-10-15 14:52:42 -0400 | [diff] [blame] | 1224 | /* Deliver packet */ |
Jon Paul Maloy | d999297 | 2015-07-16 16:54:31 -0400 | [diff] [blame] | 1225 | l->rcv_nxt++; |
| 1226 | l->stats.recv_info++; |
Jon Paul Maloy | f9aa358 | 2015-10-15 14:52:41 -0400 | [diff] [blame] | 1227 | if (!tipc_data_input(l, skb, l->inputq)) |
Jon Paul Maloy | 5266698 | 2015-10-22 08:51:41 -0400 | [diff] [blame] | 1228 | rc |= tipc_link_input(l, skb, l->inputq); |
Jon Paul Maloy | f9aa358 | 2015-10-15 14:52:41 -0400 | [diff] [blame] | 1229 | if (unlikely(++l->rcv_unacked >= TIPC_MIN_LINK_WIN)) |
Jon Paul Maloy | 5266698 | 2015-10-22 08:51:41 -0400 | [diff] [blame] | 1230 | rc |= tipc_link_build_ack_msg(l, xmitq); |
| 1231 | if (unlikely(rc & ~TIPC_LINK_SND_BC_ACK)) |
| 1232 | break; |
Jon Paul Maloy | f9aa358 | 2015-10-15 14:52:41 -0400 | [diff] [blame] | 1233 | } while ((skb = __skb_dequeue(defq))); |
| 1234 | |
| 1235 | return rc; |
| 1236 | drop: |
| 1237 | kfree_skb(skb); |
Jon Paul Maloy | d999297 | 2015-07-16 16:54:31 -0400 | [diff] [blame] | 1238 | return rc; |
| 1239 | } |
| 1240 | |
Jon Paul Maloy | 426cc2b | 2015-07-16 16:54:26 -0400 | [diff] [blame] | 1241 | static void tipc_link_build_proto_msg(struct tipc_link *l, int mtyp, bool probe, |
| 1242 | u16 rcvgap, int tolerance, int priority, |
| 1243 | struct sk_buff_head *xmitq) |
| 1244 | { |
Jon Paul Maloy | e74a386 | 2016-03-03 14:23:21 -0500 | [diff] [blame^] | 1245 | struct sk_buff *skb; |
| 1246 | struct tipc_msg *hdr; |
| 1247 | struct sk_buff_head *dfq = &l->deferdq; |
Jon Paul Maloy | 5266698 | 2015-10-22 08:51:41 -0400 | [diff] [blame] | 1248 | bool node_up = link_is_up(l->bc_rcvlink); |
Jon Paul Maloy | 426cc2b | 2015-07-16 16:54:26 -0400 | [diff] [blame] | 1249 | |
| 1250 | /* Don't send protocol message during reset or link failover */ |
Jon Paul Maloy | 662921c | 2015-07-30 18:24:21 -0400 | [diff] [blame] | 1251 | if (tipc_link_is_blocked(l)) |
Jon Paul Maloy | 426cc2b | 2015-07-16 16:54:26 -0400 | [diff] [blame] | 1252 | return; |
| 1253 | |
Jon Paul Maloy | e74a386 | 2016-03-03 14:23:21 -0500 | [diff] [blame^] | 1254 | if (!tipc_link_is_up(l) && (mtyp == STATE_MSG)) |
| 1255 | return; |
| 1256 | |
| 1257 | if (!skb_queue_empty(dfq)) |
| 1258 | rcvgap = buf_seqno(skb_peek(dfq)) - l->rcv_nxt; |
| 1259 | |
| 1260 | skb = tipc_msg_create(LINK_PROTOCOL, mtyp, INT_H_SIZE, |
| 1261 | TIPC_MAX_IF_NAME, l->addr, |
| 1262 | tipc_own_addr(l->net), 0, 0, 0); |
| 1263 | if (!skb) |
| 1264 | return; |
| 1265 | |
| 1266 | hdr = buf_msg(skb); |
| 1267 | msg_set_session(hdr, l->session); |
| 1268 | msg_set_bearer_id(hdr, l->bearer_id); |
Jon Paul Maloy | 426cc2b | 2015-07-16 16:54:26 -0400 | [diff] [blame] | 1269 | msg_set_net_plane(hdr, l->net_plane); |
Jon Paul Maloy | 5266698 | 2015-10-22 08:51:41 -0400 | [diff] [blame] | 1270 | msg_set_next_sent(hdr, l->snd_nxt); |
| 1271 | msg_set_ack(hdr, l->rcv_nxt - 1); |
| 1272 | msg_set_bcast_ack(hdr, l->bc_rcvlink->rcv_nxt - 1); |
| 1273 | msg_set_last_bcast(hdr, l->bc_sndlink->snd_nxt - 1); |
Jon Paul Maloy | 426cc2b | 2015-07-16 16:54:26 -0400 | [diff] [blame] | 1274 | msg_set_link_tolerance(hdr, tolerance); |
| 1275 | msg_set_linkprio(hdr, priority); |
| 1276 | msg_set_redundant_link(hdr, node_up); |
| 1277 | msg_set_seq_gap(hdr, 0); |
Jon Paul Maloy | 5266698 | 2015-10-22 08:51:41 -0400 | [diff] [blame] | 1278 | msg_set_seqno(hdr, l->snd_nxt + U16_MAX / 2); |
Jon Paul Maloy | 426cc2b | 2015-07-16 16:54:26 -0400 | [diff] [blame] | 1279 | |
| 1280 | if (mtyp == STATE_MSG) { |
Jon Paul Maloy | e74a386 | 2016-03-03 14:23:21 -0500 | [diff] [blame^] | 1281 | msg_set_seq_gap(hdr, rcvgap); |
| 1282 | msg_set_size(hdr, INT_H_SIZE); |
Jon Paul Maloy | 426cc2b | 2015-07-16 16:54:26 -0400 | [diff] [blame] | 1283 | msg_set_probe(hdr, probe); |
Jon Paul Maloy | 426cc2b | 2015-07-16 16:54:26 -0400 | [diff] [blame] | 1284 | l->stats.sent_states++; |
Jon Paul Maloy | 5266698 | 2015-10-22 08:51:41 -0400 | [diff] [blame] | 1285 | l->rcv_unacked = 0; |
Jon Paul Maloy | 426cc2b | 2015-07-16 16:54:26 -0400 | [diff] [blame] | 1286 | } else { |
| 1287 | /* RESET_MSG or ACTIVATE_MSG */ |
| 1288 | msg_set_max_pkt(hdr, l->advertised_mtu); |
Jon Paul Maloy | e74a386 | 2016-03-03 14:23:21 -0500 | [diff] [blame^] | 1289 | strcpy(msg_data(hdr), l->if_name); |
Jon Paul Maloy | 426cc2b | 2015-07-16 16:54:26 -0400 | [diff] [blame] | 1290 | } |
Jon Paul Maloy | e74a386 | 2016-03-03 14:23:21 -0500 | [diff] [blame^] | 1291 | if (probe) |
| 1292 | l->stats.sent_probes++; |
| 1293 | if (rcvgap) |
| 1294 | l->stats.sent_nacks++; |
Jon Paul Maloy | 426cc2b | 2015-07-16 16:54:26 -0400 | [diff] [blame] | 1295 | skb->priority = TC_PRIO_CONTROL; |
Jon Paul Maloy | 6e49815 | 2015-07-30 18:24:19 -0400 | [diff] [blame] | 1296 | __skb_queue_tail(xmitq, skb); |
Jon Paul Maloy | 426cc2b | 2015-07-16 16:54:26 -0400 | [diff] [blame] | 1297 | } |
Per Liden | b97bf3f | 2006-01-02 19:04:38 +0100 | [diff] [blame] | 1298 | |
Jon Paul Maloy | 6e49815 | 2015-07-30 18:24:19 -0400 | [diff] [blame] | 1299 | /* tipc_link_tnl_prepare(): prepare and return a list of tunnel packets |
Jon Paul Maloy | f9aa358 | 2015-10-15 14:52:41 -0400 | [diff] [blame] | 1300 | * with contents of the link's transmit and backlog queues. |
Per Liden | b97bf3f | 2006-01-02 19:04:38 +0100 | [diff] [blame] | 1301 | */ |
Jon Paul Maloy | 6e49815 | 2015-07-30 18:24:19 -0400 | [diff] [blame] | 1302 | void tipc_link_tnl_prepare(struct tipc_link *l, struct tipc_link *tnl, |
| 1303 | int mtyp, struct sk_buff_head *xmitq) |
Per Liden | b97bf3f | 2006-01-02 19:04:38 +0100 | [diff] [blame] | 1304 | { |
Jon Paul Maloy | 6e49815 | 2015-07-30 18:24:19 -0400 | [diff] [blame] | 1305 | struct sk_buff *skb, *tnlskb; |
| 1306 | struct tipc_msg *hdr, tnlhdr; |
| 1307 | struct sk_buff_head *queue = &l->transmq; |
| 1308 | struct sk_buff_head tmpxq, tnlq; |
| 1309 | u16 pktlen, pktcnt, seqno = l->snd_nxt; |
Per Liden | b97bf3f | 2006-01-02 19:04:38 +0100 | [diff] [blame] | 1310 | |
Jon Paul Maloy | 6e49815 | 2015-07-30 18:24:19 -0400 | [diff] [blame] | 1311 | if (!tnl) |
Per Liden | b97bf3f | 2006-01-02 19:04:38 +0100 | [diff] [blame] | 1312 | return; |
Jon Paul Maloy | 6e49815 | 2015-07-30 18:24:19 -0400 | [diff] [blame] | 1313 | |
| 1314 | skb_queue_head_init(&tnlq); |
| 1315 | skb_queue_head_init(&tmpxq); |
| 1316 | |
| 1317 | /* At least one packet required for safe algorithm => add dummy */ |
| 1318 | skb = tipc_msg_create(TIPC_LOW_IMPORTANCE, TIPC_DIRECT_MSG, |
Jon Paul Maloy | e74a386 | 2016-03-03 14:23:21 -0500 | [diff] [blame^] | 1319 | BASIC_H_SIZE, 0, l->addr, tipc_own_addr(l->net), |
Jon Paul Maloy | 6e49815 | 2015-07-30 18:24:19 -0400 | [diff] [blame] | 1320 | 0, 0, TIPC_ERR_NO_PORT); |
Ying Xue | a6ca109 | 2014-11-26 11:41:55 +0800 | [diff] [blame] | 1321 | if (!skb) { |
Jon Paul Maloy | 6e49815 | 2015-07-30 18:24:19 -0400 | [diff] [blame] | 1322 | pr_warn("%sunable to create tunnel packet\n", link_co_err); |
Per Liden | b97bf3f | 2006-01-02 19:04:38 +0100 | [diff] [blame] | 1323 | return; |
Allan Stephens | 5392d64 | 2006-06-25 23:52:50 -0700 | [diff] [blame] | 1324 | } |
Jon Paul Maloy | 6e49815 | 2015-07-30 18:24:19 -0400 | [diff] [blame] | 1325 | skb_queue_tail(&tnlq, skb); |
| 1326 | tipc_link_xmit(l, &tnlq, &tmpxq); |
| 1327 | __skb_queue_purge(&tmpxq); |
Per Liden | b97bf3f | 2006-01-02 19:04:38 +0100 | [diff] [blame] | 1328 | |
Jon Paul Maloy | 6e49815 | 2015-07-30 18:24:19 -0400 | [diff] [blame] | 1329 | /* Initialize reusable tunnel packet header */ |
Jon Paul Maloy | e74a386 | 2016-03-03 14:23:21 -0500 | [diff] [blame^] | 1330 | tipc_msg_init(tipc_own_addr(l->net), &tnlhdr, TUNNEL_PROTOCOL, |
Jon Paul Maloy | 6e49815 | 2015-07-30 18:24:19 -0400 | [diff] [blame] | 1331 | mtyp, INT_H_SIZE, l->addr); |
| 1332 | pktcnt = skb_queue_len(&l->transmq) + skb_queue_len(&l->backlogq); |
| 1333 | msg_set_msgcnt(&tnlhdr, pktcnt); |
| 1334 | msg_set_bearer_id(&tnlhdr, l->peer_bearer_id); |
| 1335 | tnl: |
| 1336 | /* Wrap each packet into a tunnel packet */ |
Jon Paul Maloy | 05dcc5a | 2015-03-13 16:08:10 -0400 | [diff] [blame] | 1337 | skb_queue_walk(queue, skb) { |
Jon Paul Maloy | 6e49815 | 2015-07-30 18:24:19 -0400 | [diff] [blame] | 1338 | hdr = buf_msg(skb); |
| 1339 | if (queue == &l->backlogq) |
| 1340 | msg_set_seqno(hdr, seqno++); |
| 1341 | pktlen = msg_size(hdr); |
| 1342 | msg_set_size(&tnlhdr, pktlen + INT_H_SIZE); |
| 1343 | tnlskb = tipc_buf_acquire(pktlen + INT_H_SIZE); |
| 1344 | if (!tnlskb) { |
| 1345 | pr_warn("%sunable to send packet\n", link_co_err); |
Per Liden | b97bf3f | 2006-01-02 19:04:38 +0100 | [diff] [blame] | 1346 | return; |
| 1347 | } |
Jon Paul Maloy | 6e49815 | 2015-07-30 18:24:19 -0400 | [diff] [blame] | 1348 | skb_copy_to_linear_data(tnlskb, &tnlhdr, INT_H_SIZE); |
| 1349 | skb_copy_to_linear_data_offset(tnlskb, INT_H_SIZE, hdr, pktlen); |
| 1350 | __skb_queue_tail(&tnlq, tnlskb); |
Per Liden | b97bf3f | 2006-01-02 19:04:38 +0100 | [diff] [blame] | 1351 | } |
Jon Paul Maloy | 6e49815 | 2015-07-30 18:24:19 -0400 | [diff] [blame] | 1352 | if (queue != &l->backlogq) { |
| 1353 | queue = &l->backlogq; |
| 1354 | goto tnl; |
Jon Paul Maloy | dd3f9e7 | 2015-05-14 10:46:18 -0400 | [diff] [blame] | 1355 | } |
Per Liden | b97bf3f | 2006-01-02 19:04:38 +0100 | [diff] [blame] | 1356 | |
Jon Paul Maloy | 6e49815 | 2015-07-30 18:24:19 -0400 | [diff] [blame] | 1357 | tipc_link_xmit(tnl, &tnlq, xmitq); |
Jon Paul Maloy | f006c9c | 2014-02-13 17:29:11 -0500 | [diff] [blame] | 1358 | |
Jon Paul Maloy | 6e49815 | 2015-07-30 18:24:19 -0400 | [diff] [blame] | 1359 | if (mtyp == FAILOVER_MSG) { |
| 1360 | tnl->drop_point = l->rcv_nxt; |
| 1361 | tnl->failover_reasm_skb = l->reasm_buf; |
| 1362 | l->reasm_buf = NULL; |
Jon Paul Maloy | f006c9c | 2014-02-13 17:29:11 -0500 | [diff] [blame] | 1363 | } |
Per Liden | b97bf3f | 2006-01-02 19:04:38 +0100 | [diff] [blame] | 1364 | } |
| 1365 | |
Jon Paul Maloy | d999297 | 2015-07-16 16:54:31 -0400 | [diff] [blame] | 1366 | /* tipc_link_proto_rcv(): receive link level protocol message : |
| 1367 | * Note that network plane id propagates through the network, and may |
| 1368 | * change at any time. The node with lowest numerical id determines |
| 1369 | * network plane |
| 1370 | */ |
| 1371 | static int tipc_link_proto_rcv(struct tipc_link *l, struct sk_buff *skb, |
| 1372 | struct sk_buff_head *xmitq) |
| 1373 | { |
| 1374 | struct tipc_msg *hdr = buf_msg(skb); |
| 1375 | u16 rcvgap = 0; |
Jon Paul Maloy | c1ab3f1d | 2015-10-22 08:51:38 -0400 | [diff] [blame] | 1376 | u16 ack = msg_ack(hdr); |
| 1377 | u16 gap = msg_seq_gap(hdr); |
Jon Paul Maloy | d999297 | 2015-07-16 16:54:31 -0400 | [diff] [blame] | 1378 | u16 peers_snd_nxt = msg_next_sent(hdr); |
| 1379 | u16 peers_tol = msg_link_tolerance(hdr); |
| 1380 | u16 peers_prio = msg_linkprio(hdr); |
Jon Paul Maloy | 2be80c2 | 2015-08-20 02:12:56 -0400 | [diff] [blame] | 1381 | u16 rcv_nxt = l->rcv_nxt; |
Jon Paul Maloy | 73f646c | 2015-10-15 14:52:44 -0400 | [diff] [blame] | 1382 | int mtyp = msg_type(hdr); |
Jon Paul Maloy | d999297 | 2015-07-16 16:54:31 -0400 | [diff] [blame] | 1383 | char *if_name; |
| 1384 | int rc = 0; |
| 1385 | |
Jon Paul Maloy | 5266698 | 2015-10-22 08:51:41 -0400 | [diff] [blame] | 1386 | if (tipc_link_is_blocked(l) || !xmitq) |
Jon Paul Maloy | d999297 | 2015-07-16 16:54:31 -0400 | [diff] [blame] | 1387 | goto exit; |
| 1388 | |
Jon Paul Maloy | e74a386 | 2016-03-03 14:23:21 -0500 | [diff] [blame^] | 1389 | if (tipc_own_addr(l->net) > msg_prevnode(hdr)) |
Jon Paul Maloy | d999297 | 2015-07-16 16:54:31 -0400 | [diff] [blame] | 1390 | l->net_plane = msg_net_plane(hdr); |
| 1391 | |
Jon Paul Maloy | 73f646c | 2015-10-15 14:52:44 -0400 | [diff] [blame] | 1392 | switch (mtyp) { |
Jon Paul Maloy | d999297 | 2015-07-16 16:54:31 -0400 | [diff] [blame] | 1393 | case RESET_MSG: |
| 1394 | |
| 1395 | /* Ignore duplicate RESET with old session number */ |
| 1396 | if ((less_eq(msg_session(hdr), l->peer_session)) && |
Jon Paul Maloy | e74a386 | 2016-03-03 14:23:21 -0500 | [diff] [blame^] | 1397 | (l->peer_session != ANY_SESSION)) |
Jon Paul Maloy | d999297 | 2015-07-16 16:54:31 -0400 | [diff] [blame] | 1398 | break; |
| 1399 | /* fall thru' */ |
Jon Paul Maloy | 662921c | 2015-07-30 18:24:21 -0400 | [diff] [blame] | 1400 | |
Jon Paul Maloy | d999297 | 2015-07-16 16:54:31 -0400 | [diff] [blame] | 1401 | case ACTIVATE_MSG: |
Jon Paul Maloy | c7cad0d | 2015-11-19 14:30:40 -0500 | [diff] [blame] | 1402 | skb_linearize(skb); |
| 1403 | hdr = buf_msg(skb); |
Jon Paul Maloy | d999297 | 2015-07-16 16:54:31 -0400 | [diff] [blame] | 1404 | |
| 1405 | /* Complete own link name with peer's interface name */ |
| 1406 | if_name = strrchr(l->name, ':') + 1; |
| 1407 | if (sizeof(l->name) - (if_name - l->name) <= TIPC_MAX_IF_NAME) |
| 1408 | break; |
| 1409 | if (msg_data_sz(hdr) < TIPC_MAX_IF_NAME) |
| 1410 | break; |
| 1411 | strncpy(if_name, msg_data(hdr), TIPC_MAX_IF_NAME); |
| 1412 | |
| 1413 | /* Update own tolerance if peer indicates a non-zero value */ |
| 1414 | if (in_range(peers_tol, TIPC_MIN_LINK_TOL, TIPC_MAX_LINK_TOL)) |
| 1415 | l->tolerance = peers_tol; |
| 1416 | |
| 1417 | /* Update own priority if peer's priority is higher */ |
| 1418 | if (in_range(peers_prio, l->priority + 1, TIPC_MAX_LINK_PRI)) |
| 1419 | l->priority = peers_prio; |
| 1420 | |
Jon Paul Maloy | 73f646c | 2015-10-15 14:52:44 -0400 | [diff] [blame] | 1421 | /* ACTIVATE_MSG serves as PEER_RESET if link is already down */ |
| 1422 | if ((mtyp == RESET_MSG) || !link_is_up(l)) |
| 1423 | rc = tipc_link_fsm_evt(l, LINK_PEER_RESET_EVT); |
| 1424 | |
| 1425 | /* ACTIVATE_MSG takes up link if it was already locally reset */ |
| 1426 | if ((mtyp == ACTIVATE_MSG) && (l->state == LINK_ESTABLISHING)) |
| 1427 | rc = TIPC_LINK_UP_EVT; |
| 1428 | |
Jon Paul Maloy | d999297 | 2015-07-16 16:54:31 -0400 | [diff] [blame] | 1429 | l->peer_session = msg_session(hdr); |
| 1430 | l->peer_bearer_id = msg_bearer_id(hdr); |
Jon Paul Maloy | d999297 | 2015-07-16 16:54:31 -0400 | [diff] [blame] | 1431 | if (l->mtu > msg_max_pkt(hdr)) |
| 1432 | l->mtu = msg_max_pkt(hdr); |
| 1433 | break; |
Jon Paul Maloy | 662921c | 2015-07-30 18:24:21 -0400 | [diff] [blame] | 1434 | |
Jon Paul Maloy | d999297 | 2015-07-16 16:54:31 -0400 | [diff] [blame] | 1435 | case STATE_MSG: |
Jon Paul Maloy | 662921c | 2015-07-30 18:24:21 -0400 | [diff] [blame] | 1436 | |
Jon Paul Maloy | d999297 | 2015-07-16 16:54:31 -0400 | [diff] [blame] | 1437 | /* Update own tolerance if peer indicates a non-zero value */ |
| 1438 | if (in_range(peers_tol, TIPC_MIN_LINK_TOL, TIPC_MAX_LINK_TOL)) |
| 1439 | l->tolerance = peers_tol; |
| 1440 | |
Richard Alpe | 8172981 | 2016-02-01 08:19:57 +0100 | [diff] [blame] | 1441 | if (peers_prio && in_range(peers_prio, TIPC_MIN_LINK_PRI, |
| 1442 | TIPC_MAX_LINK_PRI)) { |
| 1443 | l->priority = peers_prio; |
| 1444 | rc = tipc_link_fsm_evt(l, LINK_FAILURE_EVT); |
| 1445 | } |
| 1446 | |
Jon Paul Maloy | d999297 | 2015-07-16 16:54:31 -0400 | [diff] [blame] | 1447 | l->silent_intv_cnt = 0; |
| 1448 | l->stats.recv_states++; |
| 1449 | if (msg_probe(hdr)) |
| 1450 | l->stats.recv_probes++; |
Jon Paul Maloy | 73f646c | 2015-10-15 14:52:44 -0400 | [diff] [blame] | 1451 | |
| 1452 | if (!link_is_up(l)) { |
| 1453 | if (l->state == LINK_ESTABLISHING) |
| 1454 | rc = TIPC_LINK_UP_EVT; |
Jon Paul Maloy | d999297 | 2015-07-16 16:54:31 -0400 | [diff] [blame] | 1455 | break; |
Jon Paul Maloy | 73f646c | 2015-10-15 14:52:44 -0400 | [diff] [blame] | 1456 | } |
Jon Paul Maloy | d999297 | 2015-07-16 16:54:31 -0400 | [diff] [blame] | 1457 | |
Jon Paul Maloy | 662921c | 2015-07-30 18:24:21 -0400 | [diff] [blame] | 1458 | /* Send NACK if peer has sent pkts we haven't received yet */ |
Jon Paul Maloy | 2be80c2 | 2015-08-20 02:12:56 -0400 | [diff] [blame] | 1459 | if (more(peers_snd_nxt, rcv_nxt) && !tipc_link_is_synching(l)) |
Jon Paul Maloy | d999297 | 2015-07-16 16:54:31 -0400 | [diff] [blame] | 1460 | rcvgap = peers_snd_nxt - l->rcv_nxt; |
| 1461 | if (rcvgap || (msg_probe(hdr))) |
| 1462 | tipc_link_build_proto_msg(l, STATE_MSG, 0, rcvgap, |
Jon Paul Maloy | 1604089 | 2015-07-21 06:42:28 -0400 | [diff] [blame] | 1463 | 0, 0, xmitq); |
Jon Paul Maloy | c1ab3f1d | 2015-10-22 08:51:38 -0400 | [diff] [blame] | 1464 | tipc_link_release_pkts(l, ack); |
Jon Paul Maloy | d999297 | 2015-07-16 16:54:31 -0400 | [diff] [blame] | 1465 | |
| 1466 | /* If NACK, retransmit will now start at right position */ |
Jon Paul Maloy | c1ab3f1d | 2015-10-22 08:51:38 -0400 | [diff] [blame] | 1467 | if (gap) { |
| 1468 | rc = tipc_link_retrans(l, ack + 1, ack + gap, xmitq); |
Jon Paul Maloy | d999297 | 2015-07-16 16:54:31 -0400 | [diff] [blame] | 1469 | l->stats.recv_nacks++; |
| 1470 | } |
Jon Paul Maloy | 662921c | 2015-07-30 18:24:21 -0400 | [diff] [blame] | 1471 | |
Jon Paul Maloy | d999297 | 2015-07-16 16:54:31 -0400 | [diff] [blame] | 1472 | tipc_link_advance_backlog(l, xmitq); |
| 1473 | if (unlikely(!skb_queue_empty(&l->wakeupq))) |
| 1474 | link_prepare_wakeup(l); |
| 1475 | } |
| 1476 | exit: |
| 1477 | kfree_skb(skb); |
| 1478 | return rc; |
| 1479 | } |
| 1480 | |
Jon Paul Maloy | 5266698 | 2015-10-22 08:51:41 -0400 | [diff] [blame] | 1481 | /* tipc_link_build_bc_proto_msg() - create broadcast protocol message |
| 1482 | */ |
| 1483 | static bool tipc_link_build_bc_proto_msg(struct tipc_link *l, bool bcast, |
| 1484 | u16 peers_snd_nxt, |
| 1485 | struct sk_buff_head *xmitq) |
| 1486 | { |
| 1487 | struct sk_buff *skb; |
| 1488 | struct tipc_msg *hdr; |
| 1489 | struct sk_buff *dfrd_skb = skb_peek(&l->deferdq); |
| 1490 | u16 ack = l->rcv_nxt - 1; |
| 1491 | u16 gap_to = peers_snd_nxt - 1; |
| 1492 | |
| 1493 | skb = tipc_msg_create(BCAST_PROTOCOL, STATE_MSG, INT_H_SIZE, |
Jon Paul Maloy | e74a386 | 2016-03-03 14:23:21 -0500 | [diff] [blame^] | 1494 | 0, l->addr, tipc_own_addr(l->net), 0, 0, 0); |
Jon Paul Maloy | 5266698 | 2015-10-22 08:51:41 -0400 | [diff] [blame] | 1495 | if (!skb) |
| 1496 | return false; |
| 1497 | hdr = buf_msg(skb); |
| 1498 | msg_set_last_bcast(hdr, l->bc_sndlink->snd_nxt - 1); |
| 1499 | msg_set_bcast_ack(hdr, ack); |
| 1500 | msg_set_bcgap_after(hdr, ack); |
| 1501 | if (dfrd_skb) |
| 1502 | gap_to = buf_seqno(dfrd_skb) - 1; |
| 1503 | msg_set_bcgap_to(hdr, gap_to); |
| 1504 | msg_set_non_seq(hdr, bcast); |
| 1505 | __skb_queue_tail(xmitq, skb); |
| 1506 | return true; |
| 1507 | } |
| 1508 | |
| 1509 | /* tipc_link_build_bc_init_msg() - synchronize broadcast link endpoints. |
| 1510 | * |
| 1511 | * Give a newly added peer node the sequence number where it should |
| 1512 | * start receiving and acking broadcast packets. |
| 1513 | */ |
Wu Fengguang | 742e038 | 2015-10-24 22:56:01 +0800 | [diff] [blame] | 1514 | static void tipc_link_build_bc_init_msg(struct tipc_link *l, |
| 1515 | struct sk_buff_head *xmitq) |
Jon Paul Maloy | 5266698 | 2015-10-22 08:51:41 -0400 | [diff] [blame] | 1516 | { |
| 1517 | struct sk_buff_head list; |
| 1518 | |
| 1519 | __skb_queue_head_init(&list); |
| 1520 | if (!tipc_link_build_bc_proto_msg(l->bc_rcvlink, false, 0, &list)) |
| 1521 | return; |
| 1522 | tipc_link_xmit(l, &list, xmitq); |
| 1523 | } |
| 1524 | |
| 1525 | /* tipc_link_bc_init_rcv - receive initial broadcast synch data from peer |
| 1526 | */ |
| 1527 | void tipc_link_bc_init_rcv(struct tipc_link *l, struct tipc_msg *hdr) |
| 1528 | { |
| 1529 | int mtyp = msg_type(hdr); |
| 1530 | u16 peers_snd_nxt = msg_bc_snd_nxt(hdr); |
| 1531 | |
| 1532 | if (link_is_up(l)) |
| 1533 | return; |
| 1534 | |
| 1535 | if (msg_user(hdr) == BCAST_PROTOCOL) { |
| 1536 | l->rcv_nxt = peers_snd_nxt; |
| 1537 | l->state = LINK_ESTABLISHED; |
| 1538 | return; |
| 1539 | } |
| 1540 | |
| 1541 | if (l->peer_caps & TIPC_BCAST_SYNCH) |
| 1542 | return; |
| 1543 | |
| 1544 | if (msg_peer_node_is_up(hdr)) |
| 1545 | return; |
| 1546 | |
| 1547 | /* Compatibility: accept older, less safe initial synch data */ |
| 1548 | if ((mtyp == RESET_MSG) || (mtyp == ACTIVATE_MSG)) |
| 1549 | l->rcv_nxt = peers_snd_nxt; |
| 1550 | } |
| 1551 | |
| 1552 | /* tipc_link_bc_sync_rcv - update rcv link according to peer's send state |
| 1553 | */ |
| 1554 | void tipc_link_bc_sync_rcv(struct tipc_link *l, struct tipc_msg *hdr, |
| 1555 | struct sk_buff_head *xmitq) |
| 1556 | { |
| 1557 | u16 peers_snd_nxt = msg_bc_snd_nxt(hdr); |
| 1558 | |
| 1559 | if (!link_is_up(l)) |
| 1560 | return; |
| 1561 | |
| 1562 | if (!msg_peer_node_is_up(hdr)) |
| 1563 | return; |
| 1564 | |
| 1565 | l->bc_peer_is_up = true; |
| 1566 | |
| 1567 | /* Ignore if peers_snd_nxt goes beyond receive window */ |
| 1568 | if (more(peers_snd_nxt, l->rcv_nxt + l->window)) |
| 1569 | return; |
| 1570 | |
| 1571 | if (!more(peers_snd_nxt, l->rcv_nxt)) { |
| 1572 | l->nack_state = BC_NACK_SND_CONDITIONAL; |
| 1573 | return; |
| 1574 | } |
| 1575 | |
| 1576 | /* Don't NACK if one was recently sent or peeked */ |
| 1577 | if (l->nack_state == BC_NACK_SND_SUPPRESS) { |
| 1578 | l->nack_state = BC_NACK_SND_UNCONDITIONAL; |
| 1579 | return; |
| 1580 | } |
| 1581 | |
| 1582 | /* Conditionally delay NACK sending until next synch rcv */ |
| 1583 | if (l->nack_state == BC_NACK_SND_CONDITIONAL) { |
| 1584 | l->nack_state = BC_NACK_SND_UNCONDITIONAL; |
| 1585 | if ((peers_snd_nxt - l->rcv_nxt) < TIPC_MIN_LINK_WIN) |
| 1586 | return; |
| 1587 | } |
| 1588 | |
| 1589 | /* Send NACK now but suppress next one */ |
| 1590 | tipc_link_build_bc_proto_msg(l, true, peers_snd_nxt, xmitq); |
| 1591 | l->nack_state = BC_NACK_SND_SUPPRESS; |
| 1592 | } |
| 1593 | |
| 1594 | void tipc_link_bc_ack_rcv(struct tipc_link *l, u16 acked, |
| 1595 | struct sk_buff_head *xmitq) |
| 1596 | { |
| 1597 | struct sk_buff *skb, *tmp; |
| 1598 | struct tipc_link *snd_l = l->bc_sndlink; |
| 1599 | |
| 1600 | if (!link_is_up(l) || !l->bc_peer_is_up) |
| 1601 | return; |
| 1602 | |
| 1603 | if (!more(acked, l->acked)) |
| 1604 | return; |
| 1605 | |
| 1606 | /* Skip over packets peer has already acked */ |
| 1607 | skb_queue_walk(&snd_l->transmq, skb) { |
| 1608 | if (more(buf_seqno(skb), l->acked)) |
| 1609 | break; |
| 1610 | } |
| 1611 | |
| 1612 | /* Update/release the packets peer is acking now */ |
| 1613 | skb_queue_walk_from_safe(&snd_l->transmq, skb, tmp) { |
| 1614 | if (more(buf_seqno(skb), acked)) |
| 1615 | break; |
| 1616 | if (!--TIPC_SKB_CB(skb)->ackers) { |
| 1617 | __skb_unlink(skb, &snd_l->transmq); |
| 1618 | kfree_skb(skb); |
| 1619 | } |
| 1620 | } |
| 1621 | l->acked = acked; |
| 1622 | tipc_link_advance_backlog(snd_l, xmitq); |
| 1623 | if (unlikely(!skb_queue_empty(&snd_l->wakeupq))) |
| 1624 | link_prepare_wakeup(snd_l); |
| 1625 | } |
| 1626 | |
| 1627 | /* tipc_link_bc_nack_rcv(): receive broadcast nack message |
| 1628 | */ |
| 1629 | int tipc_link_bc_nack_rcv(struct tipc_link *l, struct sk_buff *skb, |
| 1630 | struct sk_buff_head *xmitq) |
| 1631 | { |
| 1632 | struct tipc_msg *hdr = buf_msg(skb); |
| 1633 | u32 dnode = msg_destnode(hdr); |
| 1634 | int mtyp = msg_type(hdr); |
| 1635 | u16 acked = msg_bcast_ack(hdr); |
| 1636 | u16 from = acked + 1; |
| 1637 | u16 to = msg_bcgap_to(hdr); |
| 1638 | u16 peers_snd_nxt = to + 1; |
| 1639 | int rc = 0; |
| 1640 | |
| 1641 | kfree_skb(skb); |
| 1642 | |
| 1643 | if (!tipc_link_is_up(l) || !l->bc_peer_is_up) |
| 1644 | return 0; |
| 1645 | |
| 1646 | if (mtyp != STATE_MSG) |
| 1647 | return 0; |
| 1648 | |
Jon Paul Maloy | e74a386 | 2016-03-03 14:23:21 -0500 | [diff] [blame^] | 1649 | if (dnode == tipc_own_addr(l->net)) { |
Jon Paul Maloy | 5266698 | 2015-10-22 08:51:41 -0400 | [diff] [blame] | 1650 | tipc_link_bc_ack_rcv(l, acked, xmitq); |
| 1651 | rc = tipc_link_retrans(l->bc_sndlink, from, to, xmitq); |
| 1652 | l->stats.recv_nacks++; |
| 1653 | return rc; |
| 1654 | } |
| 1655 | |
| 1656 | /* Msg for other node => suppress own NACK at next sync if applicable */ |
| 1657 | if (more(peers_snd_nxt, l->rcv_nxt) && !less(l->rcv_nxt, from)) |
| 1658 | l->nack_state = BC_NACK_SND_SUPPRESS; |
| 1659 | |
| 1660 | return 0; |
| 1661 | } |
| 1662 | |
Jon Paul Maloy | e3eea1e | 2015-03-13 16:08:11 -0400 | [diff] [blame] | 1663 | void tipc_link_set_queue_limits(struct tipc_link *l, u32 win) |
Per Liden | b97bf3f | 2006-01-02 19:04:38 +0100 | [diff] [blame] | 1664 | { |
Jon Paul Maloy | ed193ec | 2015-04-02 09:33:02 -0400 | [diff] [blame] | 1665 | int max_bulk = TIPC_MAX_PUBLICATIONS / (l->mtu / ITEM_SIZE); |
Jon Paul Maloy | 05dcc5a | 2015-03-13 16:08:10 -0400 | [diff] [blame] | 1666 | |
Jon Paul Maloy | e3eea1e | 2015-03-13 16:08:11 -0400 | [diff] [blame] | 1667 | l->window = win; |
Jon Paul Maloy | 1f66d16 | 2015-03-25 12:07:24 -0400 | [diff] [blame] | 1668 | l->backlog[TIPC_LOW_IMPORTANCE].limit = win / 2; |
| 1669 | l->backlog[TIPC_MEDIUM_IMPORTANCE].limit = win; |
| 1670 | l->backlog[TIPC_HIGH_IMPORTANCE].limit = win / 2 * 3; |
| 1671 | l->backlog[TIPC_CRITICAL_IMPORTANCE].limit = win * 2; |
| 1672 | l->backlog[TIPC_SYSTEM_IMPORTANCE].limit = max_bulk; |
Per Liden | b97bf3f | 2006-01-02 19:04:38 +0100 | [diff] [blame] | 1673 | } |
| 1674 | |
Allan Stephens | 5c216e1 | 2011-10-18 11:34:29 -0400 | [diff] [blame] | 1675 | /** |
Jon Paul Maloy | 38206d5 | 2015-11-19 14:30:46 -0500 | [diff] [blame] | 1676 | * link_reset_stats - reset link statistics |
Jon Paul Maloy | 1a90632 | 2015-11-19 14:30:47 -0500 | [diff] [blame] | 1677 | * @l: pointer to link |
Per Liden | b97bf3f | 2006-01-02 19:04:38 +0100 | [diff] [blame] | 1678 | */ |
Jon Paul Maloy | 38206d5 | 2015-11-19 14:30:46 -0500 | [diff] [blame] | 1679 | void tipc_link_reset_stats(struct tipc_link *l) |
Per Liden | b97bf3f | 2006-01-02 19:04:38 +0100 | [diff] [blame] | 1680 | { |
Jon Paul Maloy | 38206d5 | 2015-11-19 14:30:46 -0500 | [diff] [blame] | 1681 | memset(&l->stats, 0, sizeof(l->stats)); |
| 1682 | if (!link_is_bc_sndlink(l)) { |
| 1683 | l->stats.sent_info = l->snd_nxt; |
| 1684 | l->stats.recv_info = l->rcv_nxt; |
| 1685 | } |
Per Liden | b97bf3f | 2006-01-02 19:04:38 +0100 | [diff] [blame] | 1686 | } |
| 1687 | |
Jon Paul Maloy | 1a20cc2 | 2015-07-16 16:54:30 -0400 | [diff] [blame] | 1688 | static void link_print(struct tipc_link *l, const char *str) |
Per Liden | b97bf3f | 2006-01-02 19:04:38 +0100 | [diff] [blame] | 1689 | { |
Jon Paul Maloy | 1a20cc2 | 2015-07-16 16:54:30 -0400 | [diff] [blame] | 1690 | struct sk_buff *hskb = skb_peek(&l->transmq); |
Jon Paul Maloy | c1ab3f1d | 2015-10-22 08:51:38 -0400 | [diff] [blame] | 1691 | u16 head = hskb ? msg_seqno(buf_msg(hskb)) : l->snd_nxt - 1; |
Jon Paul Maloy | 1a20cc2 | 2015-07-16 16:54:30 -0400 | [diff] [blame] | 1692 | u16 tail = l->snd_nxt - 1; |
Ying Xue | 7a2f7d1 | 2014-04-21 10:55:46 +0800 | [diff] [blame] | 1693 | |
Jon Paul Maloy | 662921c | 2015-07-30 18:24:21 -0400 | [diff] [blame] | 1694 | pr_info("%s Link <%s> state %x\n", str, l->name, l->state); |
Jon Paul Maloy | 1a20cc2 | 2015-07-16 16:54:30 -0400 | [diff] [blame] | 1695 | pr_info("XMTQ: %u [%u-%u], BKLGQ: %u, SNDNX: %u, RCVNX: %u\n", |
| 1696 | skb_queue_len(&l->transmq), head, tail, |
| 1697 | skb_queue_len(&l->backlogq), l->snd_nxt, l->rcv_nxt); |
Per Liden | b97bf3f | 2006-01-02 19:04:38 +0100 | [diff] [blame] | 1698 | } |
Richard Alpe | 0655f6a | 2014-11-20 10:29:07 +0100 | [diff] [blame] | 1699 | |
| 1700 | /* Parse and validate nested (link) properties valid for media, bearer and link |
| 1701 | */ |
| 1702 | int tipc_nl_parse_link_prop(struct nlattr *prop, struct nlattr *props[]) |
| 1703 | { |
| 1704 | int err; |
| 1705 | |
| 1706 | err = nla_parse_nested(props, TIPC_NLA_PROP_MAX, prop, |
| 1707 | tipc_nl_prop_policy); |
| 1708 | if (err) |
| 1709 | return err; |
| 1710 | |
| 1711 | if (props[TIPC_NLA_PROP_PRIO]) { |
| 1712 | u32 prio; |
| 1713 | |
| 1714 | prio = nla_get_u32(props[TIPC_NLA_PROP_PRIO]); |
| 1715 | if (prio > TIPC_MAX_LINK_PRI) |
| 1716 | return -EINVAL; |
| 1717 | } |
| 1718 | |
| 1719 | if (props[TIPC_NLA_PROP_TOL]) { |
| 1720 | u32 tol; |
| 1721 | |
| 1722 | tol = nla_get_u32(props[TIPC_NLA_PROP_TOL]); |
| 1723 | if ((tol < TIPC_MIN_LINK_TOL) || (tol > TIPC_MAX_LINK_TOL)) |
| 1724 | return -EINVAL; |
| 1725 | } |
| 1726 | |
| 1727 | if (props[TIPC_NLA_PROP_WIN]) { |
| 1728 | u32 win; |
| 1729 | |
| 1730 | win = nla_get_u32(props[TIPC_NLA_PROP_WIN]); |
| 1731 | if ((win < TIPC_MIN_LINK_WIN) || (win > TIPC_MAX_LINK_WIN)) |
| 1732 | return -EINVAL; |
| 1733 | } |
| 1734 | |
| 1735 | return 0; |
| 1736 | } |
Richard Alpe | 7be57fc | 2014-11-20 10:29:12 +0100 | [diff] [blame] | 1737 | |
Richard Alpe | d818280 | 2014-11-24 11:10:29 +0100 | [diff] [blame] | 1738 | static int __tipc_nl_add_stats(struct sk_buff *skb, struct tipc_stats *s) |
Richard Alpe | 7be57fc | 2014-11-20 10:29:12 +0100 | [diff] [blame] | 1739 | { |
| 1740 | int i; |
| 1741 | struct nlattr *stats; |
| 1742 | |
| 1743 | struct nla_map { |
| 1744 | u32 key; |
| 1745 | u32 val; |
| 1746 | }; |
| 1747 | |
| 1748 | struct nla_map map[] = { |
| 1749 | {TIPC_NLA_STATS_RX_INFO, s->recv_info}, |
| 1750 | {TIPC_NLA_STATS_RX_FRAGMENTS, s->recv_fragments}, |
| 1751 | {TIPC_NLA_STATS_RX_FRAGMENTED, s->recv_fragmented}, |
| 1752 | {TIPC_NLA_STATS_RX_BUNDLES, s->recv_bundles}, |
| 1753 | {TIPC_NLA_STATS_RX_BUNDLED, s->recv_bundled}, |
| 1754 | {TIPC_NLA_STATS_TX_INFO, s->sent_info}, |
| 1755 | {TIPC_NLA_STATS_TX_FRAGMENTS, s->sent_fragments}, |
| 1756 | {TIPC_NLA_STATS_TX_FRAGMENTED, s->sent_fragmented}, |
| 1757 | {TIPC_NLA_STATS_TX_BUNDLES, s->sent_bundles}, |
| 1758 | {TIPC_NLA_STATS_TX_BUNDLED, s->sent_bundled}, |
| 1759 | {TIPC_NLA_STATS_MSG_PROF_TOT, (s->msg_length_counts) ? |
| 1760 | s->msg_length_counts : 1}, |
| 1761 | {TIPC_NLA_STATS_MSG_LEN_CNT, s->msg_length_counts}, |
| 1762 | {TIPC_NLA_STATS_MSG_LEN_TOT, s->msg_lengths_total}, |
| 1763 | {TIPC_NLA_STATS_MSG_LEN_P0, s->msg_length_profile[0]}, |
| 1764 | {TIPC_NLA_STATS_MSG_LEN_P1, s->msg_length_profile[1]}, |
| 1765 | {TIPC_NLA_STATS_MSG_LEN_P2, s->msg_length_profile[2]}, |
| 1766 | {TIPC_NLA_STATS_MSG_LEN_P3, s->msg_length_profile[3]}, |
| 1767 | {TIPC_NLA_STATS_MSG_LEN_P4, s->msg_length_profile[4]}, |
| 1768 | {TIPC_NLA_STATS_MSG_LEN_P5, s->msg_length_profile[5]}, |
| 1769 | {TIPC_NLA_STATS_MSG_LEN_P6, s->msg_length_profile[6]}, |
| 1770 | {TIPC_NLA_STATS_RX_STATES, s->recv_states}, |
| 1771 | {TIPC_NLA_STATS_RX_PROBES, s->recv_probes}, |
| 1772 | {TIPC_NLA_STATS_RX_NACKS, s->recv_nacks}, |
| 1773 | {TIPC_NLA_STATS_RX_DEFERRED, s->deferred_recv}, |
| 1774 | {TIPC_NLA_STATS_TX_STATES, s->sent_states}, |
| 1775 | {TIPC_NLA_STATS_TX_PROBES, s->sent_probes}, |
| 1776 | {TIPC_NLA_STATS_TX_NACKS, s->sent_nacks}, |
| 1777 | {TIPC_NLA_STATS_TX_ACKS, s->sent_acks}, |
| 1778 | {TIPC_NLA_STATS_RETRANSMITTED, s->retransmitted}, |
| 1779 | {TIPC_NLA_STATS_DUPLICATES, s->duplicates}, |
| 1780 | {TIPC_NLA_STATS_LINK_CONGS, s->link_congs}, |
| 1781 | {TIPC_NLA_STATS_MAX_QUEUE, s->max_queue_sz}, |
| 1782 | {TIPC_NLA_STATS_AVG_QUEUE, s->queue_sz_counts ? |
| 1783 | (s->accu_queue_sz / s->queue_sz_counts) : 0} |
| 1784 | }; |
| 1785 | |
| 1786 | stats = nla_nest_start(skb, TIPC_NLA_LINK_STATS); |
| 1787 | if (!stats) |
| 1788 | return -EMSGSIZE; |
| 1789 | |
| 1790 | for (i = 0; i < ARRAY_SIZE(map); i++) |
| 1791 | if (nla_put_u32(skb, map[i].key, map[i].val)) |
| 1792 | goto msg_full; |
| 1793 | |
| 1794 | nla_nest_end(skb, stats); |
| 1795 | |
| 1796 | return 0; |
| 1797 | msg_full: |
| 1798 | nla_nest_cancel(skb, stats); |
| 1799 | |
| 1800 | return -EMSGSIZE; |
| 1801 | } |
| 1802 | |
| 1803 | /* Caller should hold appropriate locks to protect the link */ |
Jon Paul Maloy | 5be9c08 | 2015-11-19 14:30:45 -0500 | [diff] [blame] | 1804 | int __tipc_nl_add_link(struct net *net, struct tipc_nl_msg *msg, |
| 1805 | struct tipc_link *link, int nlflags) |
Richard Alpe | 7be57fc | 2014-11-20 10:29:12 +0100 | [diff] [blame] | 1806 | { |
| 1807 | int err; |
| 1808 | void *hdr; |
| 1809 | struct nlattr *attrs; |
| 1810 | struct nlattr *prop; |
Ying Xue | 3474753 | 2015-01-09 15:27:10 +0800 | [diff] [blame] | 1811 | struct tipc_net *tn = net_generic(net, tipc_net_id); |
Richard Alpe | 7be57fc | 2014-11-20 10:29:12 +0100 | [diff] [blame] | 1812 | |
Richard Alpe | bfb3e5d | 2015-02-09 09:50:03 +0100 | [diff] [blame] | 1813 | hdr = genlmsg_put(msg->skb, msg->portid, msg->seq, &tipc_genl_family, |
Nicolas Dichtel | f2f6739 | 2015-04-28 18:33:50 +0200 | [diff] [blame] | 1814 | nlflags, TIPC_NL_LINK_GET); |
Richard Alpe | 7be57fc | 2014-11-20 10:29:12 +0100 | [diff] [blame] | 1815 | if (!hdr) |
| 1816 | return -EMSGSIZE; |
| 1817 | |
| 1818 | attrs = nla_nest_start(msg->skb, TIPC_NLA_LINK); |
| 1819 | if (!attrs) |
| 1820 | goto msg_full; |
| 1821 | |
| 1822 | if (nla_put_string(msg->skb, TIPC_NLA_LINK_NAME, link->name)) |
| 1823 | goto attr_msg_full; |
| 1824 | if (nla_put_u32(msg->skb, TIPC_NLA_LINK_DEST, |
Ying Xue | 3474753 | 2015-01-09 15:27:10 +0800 | [diff] [blame] | 1825 | tipc_cluster_mask(tn->own_addr))) |
Richard Alpe | 7be57fc | 2014-11-20 10:29:12 +0100 | [diff] [blame] | 1826 | goto attr_msg_full; |
Jon Paul Maloy | ed193ec | 2015-04-02 09:33:02 -0400 | [diff] [blame] | 1827 | if (nla_put_u32(msg->skb, TIPC_NLA_LINK_MTU, link->mtu)) |
Richard Alpe | 7be57fc | 2014-11-20 10:29:12 +0100 | [diff] [blame] | 1828 | goto attr_msg_full; |
Jon Paul Maloy | a97b9d3 | 2015-05-14 10:46:15 -0400 | [diff] [blame] | 1829 | if (nla_put_u32(msg->skb, TIPC_NLA_LINK_RX, link->rcv_nxt)) |
Richard Alpe | 7be57fc | 2014-11-20 10:29:12 +0100 | [diff] [blame] | 1830 | goto attr_msg_full; |
Jon Paul Maloy | a97b9d3 | 2015-05-14 10:46:15 -0400 | [diff] [blame] | 1831 | if (nla_put_u32(msg->skb, TIPC_NLA_LINK_TX, link->snd_nxt)) |
Richard Alpe | 7be57fc | 2014-11-20 10:29:12 +0100 | [diff] [blame] | 1832 | goto attr_msg_full; |
| 1833 | |
| 1834 | if (tipc_link_is_up(link)) |
| 1835 | if (nla_put_flag(msg->skb, TIPC_NLA_LINK_UP)) |
| 1836 | goto attr_msg_full; |
Jon Paul Maloy | c72fa87 | 2015-10-22 08:51:46 -0400 | [diff] [blame] | 1837 | if (link->active) |
Richard Alpe | 7be57fc | 2014-11-20 10:29:12 +0100 | [diff] [blame] | 1838 | if (nla_put_flag(msg->skb, TIPC_NLA_LINK_ACTIVE)) |
| 1839 | goto attr_msg_full; |
| 1840 | |
| 1841 | prop = nla_nest_start(msg->skb, TIPC_NLA_LINK_PROP); |
| 1842 | if (!prop) |
| 1843 | goto attr_msg_full; |
| 1844 | if (nla_put_u32(msg->skb, TIPC_NLA_PROP_PRIO, link->priority)) |
| 1845 | goto prop_msg_full; |
| 1846 | if (nla_put_u32(msg->skb, TIPC_NLA_PROP_TOL, link->tolerance)) |
| 1847 | goto prop_msg_full; |
| 1848 | if (nla_put_u32(msg->skb, TIPC_NLA_PROP_WIN, |
Jon Paul Maloy | 1f66d16 | 2015-03-25 12:07:24 -0400 | [diff] [blame] | 1849 | link->window)) |
Richard Alpe | 7be57fc | 2014-11-20 10:29:12 +0100 | [diff] [blame] | 1850 | goto prop_msg_full; |
| 1851 | if (nla_put_u32(msg->skb, TIPC_NLA_PROP_PRIO, link->priority)) |
| 1852 | goto prop_msg_full; |
| 1853 | nla_nest_end(msg->skb, prop); |
| 1854 | |
| 1855 | err = __tipc_nl_add_stats(msg->skb, &link->stats); |
| 1856 | if (err) |
| 1857 | goto attr_msg_full; |
| 1858 | |
| 1859 | nla_nest_end(msg->skb, attrs); |
| 1860 | genlmsg_end(msg->skb, hdr); |
| 1861 | |
| 1862 | return 0; |
| 1863 | |
| 1864 | prop_msg_full: |
| 1865 | nla_nest_cancel(msg->skb, prop); |
| 1866 | attr_msg_full: |
| 1867 | nla_nest_cancel(msg->skb, attrs); |
| 1868 | msg_full: |
| 1869 | genlmsg_cancel(msg->skb, hdr); |
| 1870 | |
| 1871 | return -EMSGSIZE; |
| 1872 | } |
Jon Paul Maloy | 38206d5 | 2015-11-19 14:30:46 -0500 | [diff] [blame] | 1873 | |
| 1874 | static int __tipc_nl_add_bc_link_stat(struct sk_buff *skb, |
| 1875 | struct tipc_stats *stats) |
| 1876 | { |
| 1877 | int i; |
| 1878 | struct nlattr *nest; |
| 1879 | |
| 1880 | struct nla_map { |
| 1881 | __u32 key; |
| 1882 | __u32 val; |
| 1883 | }; |
| 1884 | |
| 1885 | struct nla_map map[] = { |
| 1886 | {TIPC_NLA_STATS_RX_INFO, stats->recv_info}, |
| 1887 | {TIPC_NLA_STATS_RX_FRAGMENTS, stats->recv_fragments}, |
| 1888 | {TIPC_NLA_STATS_RX_FRAGMENTED, stats->recv_fragmented}, |
| 1889 | {TIPC_NLA_STATS_RX_BUNDLES, stats->recv_bundles}, |
| 1890 | {TIPC_NLA_STATS_RX_BUNDLED, stats->recv_bundled}, |
| 1891 | {TIPC_NLA_STATS_TX_INFO, stats->sent_info}, |
| 1892 | {TIPC_NLA_STATS_TX_FRAGMENTS, stats->sent_fragments}, |
| 1893 | {TIPC_NLA_STATS_TX_FRAGMENTED, stats->sent_fragmented}, |
| 1894 | {TIPC_NLA_STATS_TX_BUNDLES, stats->sent_bundles}, |
| 1895 | {TIPC_NLA_STATS_TX_BUNDLED, stats->sent_bundled}, |
| 1896 | {TIPC_NLA_STATS_RX_NACKS, stats->recv_nacks}, |
| 1897 | {TIPC_NLA_STATS_RX_DEFERRED, stats->deferred_recv}, |
| 1898 | {TIPC_NLA_STATS_TX_NACKS, stats->sent_nacks}, |
| 1899 | {TIPC_NLA_STATS_TX_ACKS, stats->sent_acks}, |
| 1900 | {TIPC_NLA_STATS_RETRANSMITTED, stats->retransmitted}, |
| 1901 | {TIPC_NLA_STATS_DUPLICATES, stats->duplicates}, |
| 1902 | {TIPC_NLA_STATS_LINK_CONGS, stats->link_congs}, |
| 1903 | {TIPC_NLA_STATS_MAX_QUEUE, stats->max_queue_sz}, |
| 1904 | {TIPC_NLA_STATS_AVG_QUEUE, stats->queue_sz_counts ? |
| 1905 | (stats->accu_queue_sz / stats->queue_sz_counts) : 0} |
| 1906 | }; |
| 1907 | |
| 1908 | nest = nla_nest_start(skb, TIPC_NLA_LINK_STATS); |
| 1909 | if (!nest) |
| 1910 | return -EMSGSIZE; |
| 1911 | |
| 1912 | for (i = 0; i < ARRAY_SIZE(map); i++) |
| 1913 | if (nla_put_u32(skb, map[i].key, map[i].val)) |
| 1914 | goto msg_full; |
| 1915 | |
| 1916 | nla_nest_end(skb, nest); |
| 1917 | |
| 1918 | return 0; |
| 1919 | msg_full: |
| 1920 | nla_nest_cancel(skb, nest); |
| 1921 | |
| 1922 | return -EMSGSIZE; |
| 1923 | } |
| 1924 | |
| 1925 | int tipc_nl_add_bc_link(struct net *net, struct tipc_nl_msg *msg) |
| 1926 | { |
| 1927 | int err; |
| 1928 | void *hdr; |
| 1929 | struct nlattr *attrs; |
| 1930 | struct nlattr *prop; |
| 1931 | struct tipc_net *tn = net_generic(net, tipc_net_id); |
| 1932 | struct tipc_link *bcl = tn->bcl; |
| 1933 | |
| 1934 | if (!bcl) |
| 1935 | return 0; |
| 1936 | |
| 1937 | tipc_bcast_lock(net); |
| 1938 | |
| 1939 | hdr = genlmsg_put(msg->skb, msg->portid, msg->seq, &tipc_genl_family, |
| 1940 | NLM_F_MULTI, TIPC_NL_LINK_GET); |
Insu Yun | b53ce3e | 2016-02-17 11:47:35 -0500 | [diff] [blame] | 1941 | if (!hdr) { |
| 1942 | tipc_bcast_unlock(net); |
Jon Paul Maloy | 38206d5 | 2015-11-19 14:30:46 -0500 | [diff] [blame] | 1943 | return -EMSGSIZE; |
Insu Yun | b53ce3e | 2016-02-17 11:47:35 -0500 | [diff] [blame] | 1944 | } |
Jon Paul Maloy | 38206d5 | 2015-11-19 14:30:46 -0500 | [diff] [blame] | 1945 | |
| 1946 | attrs = nla_nest_start(msg->skb, TIPC_NLA_LINK); |
| 1947 | if (!attrs) |
| 1948 | goto msg_full; |
| 1949 | |
| 1950 | /* The broadcast link is always up */ |
| 1951 | if (nla_put_flag(msg->skb, TIPC_NLA_LINK_UP)) |
| 1952 | goto attr_msg_full; |
| 1953 | |
| 1954 | if (nla_put_flag(msg->skb, TIPC_NLA_LINK_BROADCAST)) |
| 1955 | goto attr_msg_full; |
| 1956 | if (nla_put_string(msg->skb, TIPC_NLA_LINK_NAME, bcl->name)) |
| 1957 | goto attr_msg_full; |
| 1958 | if (nla_put_u32(msg->skb, TIPC_NLA_LINK_RX, bcl->rcv_nxt)) |
| 1959 | goto attr_msg_full; |
| 1960 | if (nla_put_u32(msg->skb, TIPC_NLA_LINK_TX, bcl->snd_nxt)) |
| 1961 | goto attr_msg_full; |
| 1962 | |
| 1963 | prop = nla_nest_start(msg->skb, TIPC_NLA_LINK_PROP); |
| 1964 | if (!prop) |
| 1965 | goto attr_msg_full; |
| 1966 | if (nla_put_u32(msg->skb, TIPC_NLA_PROP_WIN, bcl->window)) |
| 1967 | goto prop_msg_full; |
| 1968 | nla_nest_end(msg->skb, prop); |
| 1969 | |
| 1970 | err = __tipc_nl_add_bc_link_stat(msg->skb, &bcl->stats); |
| 1971 | if (err) |
| 1972 | goto attr_msg_full; |
| 1973 | |
| 1974 | tipc_bcast_unlock(net); |
| 1975 | nla_nest_end(msg->skb, attrs); |
| 1976 | genlmsg_end(msg->skb, hdr); |
| 1977 | |
| 1978 | return 0; |
| 1979 | |
| 1980 | prop_msg_full: |
| 1981 | nla_nest_cancel(msg->skb, prop); |
| 1982 | attr_msg_full: |
| 1983 | nla_nest_cancel(msg->skb, attrs); |
| 1984 | msg_full: |
| 1985 | tipc_bcast_unlock(net); |
| 1986 | genlmsg_cancel(msg->skb, hdr); |
| 1987 | |
| 1988 | return -EMSGSIZE; |
| 1989 | } |
| 1990 | |
Richard Alpe | d01332f | 2016-02-01 08:19:56 +0100 | [diff] [blame] | 1991 | void tipc_link_set_tolerance(struct tipc_link *l, u32 tol, |
| 1992 | struct sk_buff_head *xmitq) |
Jon Paul Maloy | 38206d5 | 2015-11-19 14:30:46 -0500 | [diff] [blame] | 1993 | { |
| 1994 | l->tolerance = tol; |
Richard Alpe | d01332f | 2016-02-01 08:19:56 +0100 | [diff] [blame] | 1995 | tipc_link_build_proto_msg(l, STATE_MSG, 0, 0, tol, 0, xmitq); |
Jon Paul Maloy | 38206d5 | 2015-11-19 14:30:46 -0500 | [diff] [blame] | 1996 | } |
| 1997 | |
Richard Alpe | d01332f | 2016-02-01 08:19:56 +0100 | [diff] [blame] | 1998 | void tipc_link_set_prio(struct tipc_link *l, u32 prio, |
| 1999 | struct sk_buff_head *xmitq) |
Jon Paul Maloy | 38206d5 | 2015-11-19 14:30:46 -0500 | [diff] [blame] | 2000 | { |
| 2001 | l->priority = prio; |
Richard Alpe | d01332f | 2016-02-01 08:19:56 +0100 | [diff] [blame] | 2002 | tipc_link_build_proto_msg(l, STATE_MSG, 0, 0, 0, prio, xmitq); |
Jon Paul Maloy | 38206d5 | 2015-11-19 14:30:46 -0500 | [diff] [blame] | 2003 | } |
| 2004 | |
| 2005 | void tipc_link_set_abort_limit(struct tipc_link *l, u32 limit) |
| 2006 | { |
| 2007 | l->abort_limit = limit; |
| 2008 | } |