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Commit | Line | Data |
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b97bf3fd PL |
1 | /* |
2 | * net/tipc/link.c: TIPC link code | |
c4307285 | 3 | * |
e74a386d | 4 | * Copyright (c) 1996-2007, 2012-2016, Ericsson AB |
198d73b8 | 5 | * Copyright (c) 2004-2007, 2010-2013, Wind River Systems |
b97bf3fd PL |
6 | * All rights reserved. |
7 | * | |
9ea1fd3c | 8 | * Redistribution and use in source and binary forms, with or without |
b97bf3fd PL |
9 | * modification, are permitted provided that the following conditions are met: |
10 | * | |
9ea1fd3c PL |
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. | |
b97bf3fd | 19 | * |
9ea1fd3c PL |
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 | |
b97bf3fd PL |
34 | * POSSIBILITY OF SUCH DAMAGE. |
35 | */ | |
36 | ||
37 | #include "core.h" | |
e3eea1eb | 38 | #include "subscr.h" |
b97bf3fd | 39 | #include "link.h" |
7be57fc6 | 40 | #include "bcast.h" |
9816f061 | 41 | #include "socket.h" |
b97bf3fd | 42 | #include "name_distr.h" |
b97bf3fd | 43 | #include "discover.h" |
0655f6a8 | 44 | #include "netlink.h" |
b97bf3fd | 45 | |
796c75d0 YX |
46 | #include <linux/pkt_sched.h> |
47 | ||
38206d59 JPM |
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]; | |
38206d59 JPM |
126 | struct net *net; |
127 | ||
128 | /* Management and link supervision data */ | |
129 | u32 peer_session; | |
e74a386d | 130 | u32 session; |
38206d59 JPM |
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; | |
e74a386d | 140 | char if_name[TIPC_MAX_IF_NAME]; |
38206d59 JPM |
141 | u32 priority; |
142 | char net_plane; | |
88e8ac70 | 143 | u16 rst_cnt; |
38206d59 JPM |
144 | |
145 | /* Failover/synch */ | |
146 | u16 drop_point; | |
147 | struct sk_buff *failover_reasm_skb; | |
148 | ||
149 | /* Max packet negotiation */ | |
150 | u16 mtu; | |
151 | u16 advertised_mtu; | |
152 | ||
153 | /* Sending */ | |
154 | struct sk_buff_head transmq; | |
155 | struct sk_buff_head backlogq; | |
156 | struct { | |
157 | u16 len; | |
158 | u16 limit; | |
159 | } backlog[5]; | |
160 | u16 snd_nxt; | |
161 | u16 last_retransm; | |
162 | u16 window; | |
163 | u32 stale_count; | |
164 | ||
165 | /* Reception */ | |
166 | u16 rcv_nxt; | |
167 | u32 rcv_unacked; | |
168 | struct sk_buff_head deferdq; | |
169 | struct sk_buff_head *inputq; | |
170 | struct sk_buff_head *namedq; | |
171 | ||
172 | /* Congestion handling */ | |
173 | struct sk_buff_head wakeupq; | |
174 | ||
175 | /* Fragmentation/reassembly */ | |
176 | struct sk_buff *reasm_buf; | |
177 | ||
178 | /* Broadcast */ | |
179 | u16 ackers; | |
180 | u16 acked; | |
181 | struct tipc_link *bc_rcvlink; | |
182 | struct tipc_link *bc_sndlink; | |
183 | int nack_state; | |
184 | bool bc_peer_is_up; | |
185 | ||
186 | /* Statistics */ | |
187 | struct tipc_stats stats; | |
188 | }; | |
189 | ||
2cf8aa19 EH |
190 | /* |
191 | * Error message prefixes | |
192 | */ | |
6e498158 | 193 | static const char *link_co_err = "Link tunneling error, "; |
2cf8aa19 | 194 | static const char *link_rst_msg = "Resetting link "; |
7be57fc6 | 195 | |
52666986 JPM |
196 | /* Send states for broadcast NACKs |
197 | */ | |
198 | enum { | |
199 | BC_NACK_SND_CONDITIONAL, | |
200 | BC_NACK_SND_UNCONDITIONAL, | |
201 | BC_NACK_SND_SUPPRESS, | |
202 | }; | |
203 | ||
d999297c JPM |
204 | /* |
205 | * Interval between NACKs when packets arrive out of order | |
206 | */ | |
207 | #define TIPC_NACK_INTV (TIPC_MIN_LINK_WIN * 2) | |
e74a386d JPM |
208 | |
209 | /* Wildcard value for link session numbers. When it is known that | |
210 | * peer endpoint is down, any session number must be accepted. | |
a686e685 | 211 | */ |
e74a386d | 212 | #define ANY_SESSION 0x10000 |
a686e685 | 213 | |
662921cd | 214 | /* Link FSM states: |
b97bf3fd | 215 | */ |
d3504c34 | 216 | enum { |
662921cd JPM |
217 | LINK_ESTABLISHED = 0xe, |
218 | LINK_ESTABLISHING = 0xe << 4, | |
219 | LINK_RESET = 0x1 << 8, | |
220 | LINK_RESETTING = 0x2 << 12, | |
221 | LINK_PEER_RESET = 0xd << 16, | |
222 | LINK_FAILINGOVER = 0xf << 20, | |
223 | LINK_SYNCHING = 0xc << 24 | |
d3504c34 JPM |
224 | }; |
225 | ||
226 | /* Link FSM state checking routines | |
227 | */ | |
662921cd | 228 | static int link_is_up(struct tipc_link *l) |
d3504c34 | 229 | { |
662921cd | 230 | return l->state & (LINK_ESTABLISHED | LINK_SYNCHING); |
d3504c34 | 231 | } |
b97bf3fd | 232 | |
d999297c JPM |
233 | static int tipc_link_proto_rcv(struct tipc_link *l, struct sk_buff *skb, |
234 | struct sk_buff_head *xmitq); | |
426cc2b8 JPM |
235 | static void tipc_link_build_proto_msg(struct tipc_link *l, int mtyp, bool probe, |
236 | u16 rcvgap, int tolerance, int priority, | |
237 | struct sk_buff_head *xmitq); | |
1a90632d | 238 | static void link_print(struct tipc_link *l, const char *str); |
52666986 JPM |
239 | static void tipc_link_build_nack_msg(struct tipc_link *l, |
240 | struct sk_buff_head *xmitq); | |
241 | static void tipc_link_build_bc_init_msg(struct tipc_link *l, | |
242 | struct sk_buff_head *xmitq); | |
243 | static bool tipc_link_release_pkts(struct tipc_link *l, u16 to); | |
8b4ed863 | 244 | |
b97bf3fd | 245 | /* |
05790c64 | 246 | * Simple non-static link routines (i.e. referenced outside this file) |
b97bf3fd | 247 | */ |
662921cd | 248 | bool tipc_link_is_up(struct tipc_link *l) |
b97bf3fd | 249 | { |
662921cd JPM |
250 | return link_is_up(l); |
251 | } | |
252 | ||
c8199300 JPM |
253 | bool tipc_link_peer_is_down(struct tipc_link *l) |
254 | { | |
255 | return l->state == LINK_PEER_RESET; | |
256 | } | |
257 | ||
662921cd JPM |
258 | bool tipc_link_is_reset(struct tipc_link *l) |
259 | { | |
260 | return l->state & (LINK_RESET | LINK_FAILINGOVER | LINK_ESTABLISHING); | |
261 | } | |
262 | ||
73f646ce JPM |
263 | bool tipc_link_is_establishing(struct tipc_link *l) |
264 | { | |
265 | return l->state == LINK_ESTABLISHING; | |
266 | } | |
267 | ||
662921cd JPM |
268 | bool tipc_link_is_synching(struct tipc_link *l) |
269 | { | |
270 | return l->state == LINK_SYNCHING; | |
271 | } | |
272 | ||
273 | bool tipc_link_is_failingover(struct tipc_link *l) | |
274 | { | |
275 | return l->state == LINK_FAILINGOVER; | |
276 | } | |
277 | ||
278 | bool tipc_link_is_blocked(struct tipc_link *l) | |
279 | { | |
280 | return l->state & (LINK_RESETTING | LINK_PEER_RESET | LINK_FAILINGOVER); | |
b97bf3fd PL |
281 | } |
282 | ||
742e0383 | 283 | static bool link_is_bc_sndlink(struct tipc_link *l) |
52666986 JPM |
284 | { |
285 | return !l->bc_sndlink; | |
286 | } | |
287 | ||
742e0383 | 288 | static bool link_is_bc_rcvlink(struct tipc_link *l) |
52666986 JPM |
289 | { |
290 | return ((l->bc_rcvlink == l) && !link_is_bc_sndlink(l)); | |
291 | } | |
292 | ||
9d13ec65 | 293 | int tipc_link_is_active(struct tipc_link *l) |
b97bf3fd | 294 | { |
c72fa872 JPM |
295 | return l->active; |
296 | } | |
9d13ec65 | 297 | |
c72fa872 JPM |
298 | void tipc_link_set_active(struct tipc_link *l, bool active) |
299 | { | |
300 | l->active = active; | |
b97bf3fd PL |
301 | } |
302 | ||
38206d59 JPM |
303 | u32 tipc_link_id(struct tipc_link *l) |
304 | { | |
305 | return l->peer_bearer_id << 16 | l->bearer_id; | |
306 | } | |
307 | ||
308 | int tipc_link_window(struct tipc_link *l) | |
309 | { | |
310 | return l->window; | |
311 | } | |
312 | ||
313 | int tipc_link_prio(struct tipc_link *l) | |
314 | { | |
315 | return l->priority; | |
316 | } | |
317 | ||
318 | unsigned long tipc_link_tolerance(struct tipc_link *l) | |
319 | { | |
320 | return l->tolerance; | |
321 | } | |
322 | ||
323 | struct sk_buff_head *tipc_link_inputq(struct tipc_link *l) | |
324 | { | |
325 | return l->inputq; | |
326 | } | |
327 | ||
328 | char tipc_link_plane(struct tipc_link *l) | |
329 | { | |
330 | return l->net_plane; | |
331 | } | |
332 | ||
52666986 JPM |
333 | void tipc_link_add_bc_peer(struct tipc_link *snd_l, |
334 | struct tipc_link *uc_l, | |
335 | struct sk_buff_head *xmitq) | |
2f566124 | 336 | { |
52666986 JPM |
337 | struct tipc_link *rcv_l = uc_l->bc_rcvlink; |
338 | ||
339 | snd_l->ackers++; | |
340 | rcv_l->acked = snd_l->snd_nxt - 1; | |
9a650838 | 341 | snd_l->state = LINK_ESTABLISHED; |
52666986 | 342 | tipc_link_build_bc_init_msg(uc_l, xmitq); |
2f566124 JPM |
343 | } |
344 | ||
52666986 JPM |
345 | void tipc_link_remove_bc_peer(struct tipc_link *snd_l, |
346 | struct tipc_link *rcv_l, | |
347 | struct sk_buff_head *xmitq) | |
2f566124 | 348 | { |
52666986 JPM |
349 | u16 ack = snd_l->snd_nxt - 1; |
350 | ||
351 | snd_l->ackers--; | |
352 | tipc_link_bc_ack_rcv(rcv_l, ack, xmitq); | |
353 | tipc_link_reset(rcv_l); | |
354 | rcv_l->state = LINK_RESET; | |
355 | if (!snd_l->ackers) { | |
356 | tipc_link_reset(snd_l); | |
9a650838 | 357 | snd_l->state = LINK_RESET; |
52666986 JPM |
358 | __skb_queue_purge(xmitq); |
359 | } | |
2f566124 JPM |
360 | } |
361 | ||
362 | int tipc_link_bc_peers(struct tipc_link *l) | |
363 | { | |
364 | return l->ackers; | |
365 | } | |
366 | ||
959e1781 JPM |
367 | void tipc_link_set_mtu(struct tipc_link *l, int mtu) |
368 | { | |
369 | l->mtu = mtu; | |
370 | } | |
371 | ||
372 | int tipc_link_mtu(struct tipc_link *l) | |
373 | { | |
374 | return l->mtu; | |
375 | } | |
376 | ||
38206d59 JPM |
377 | u16 tipc_link_rcv_nxt(struct tipc_link *l) |
378 | { | |
379 | return l->rcv_nxt; | |
380 | } | |
381 | ||
382 | u16 tipc_link_acked(struct tipc_link *l) | |
383 | { | |
384 | return l->acked; | |
385 | } | |
386 | ||
387 | char *tipc_link_name(struct tipc_link *l) | |
388 | { | |
389 | return l->name; | |
390 | } | |
391 | ||
b97bf3fd | 392 | /** |
4323add6 | 393 | * tipc_link_create - create a new link |
440d8963 | 394 | * @n: pointer to associated node |
0e05498e JPM |
395 | * @if_name: associated interface name |
396 | * @bearer_id: id (index) of associated bearer | |
397 | * @tolerance: link tolerance to be used by link | |
398 | * @net_plane: network plane (A,B,c..) this link belongs to | |
399 | * @mtu: mtu to be advertised by link | |
400 | * @priority: priority to be used by link | |
401 | * @window: send window to be used by link | |
402 | * @session: session to be used by link | |
440d8963 | 403 | * @ownnode: identity of own node |
0e05498e | 404 | * @peer: node id of peer node |
fd556f20 | 405 | * @peer_caps: bitmap describing peer node capabilities |
52666986 JPM |
406 | * @bc_sndlink: the namespace global link used for broadcast sending |
407 | * @bc_rcvlink: the peer specific link used for broadcast reception | |
440d8963 JPM |
408 | * @inputq: queue to put messages ready for delivery |
409 | * @namedq: queue to put binding table update messages ready for delivery | |
410 | * @link: return value, pointer to put the created link | |
c4307285 | 411 | * |
440d8963 | 412 | * Returns true if link was created, otherwise false |
b97bf3fd | 413 | */ |
c72fa872 | 414 | bool tipc_link_create(struct net *net, char *if_name, int bearer_id, |
0e05498e JPM |
415 | int tolerance, char net_plane, u32 mtu, int priority, |
416 | int window, u32 session, u32 ownnode, u32 peer, | |
52666986 | 417 | u16 peer_caps, |
52666986 JPM |
418 | struct tipc_link *bc_sndlink, |
419 | struct tipc_link *bc_rcvlink, | |
420 | struct sk_buff_head *inputq, | |
421 | struct sk_buff_head *namedq, | |
440d8963 | 422 | struct tipc_link **link) |
b97bf3fd | 423 | { |
440d8963 | 424 | struct tipc_link *l; |
37b9c08a | 425 | |
440d8963 JPM |
426 | l = kzalloc(sizeof(*l), GFP_ATOMIC); |
427 | if (!l) | |
428 | return false; | |
429 | *link = l; | |
e74a386d | 430 | l->session = session; |
37b9c08a | 431 | |
440d8963 | 432 | /* Note: peer i/f name is completed by reset/activate message */ |
440d8963 JPM |
433 | sprintf(l->name, "%u.%u.%u:%s-%u.%u.%u:unknown", |
434 | tipc_zone(ownnode), tipc_cluster(ownnode), tipc_node(ownnode), | |
435 | if_name, tipc_zone(peer), tipc_cluster(peer), tipc_node(peer)); | |
e74a386d | 436 | strcpy(l->if_name, if_name); |
440d8963 | 437 | l->addr = peer; |
fd556f20 | 438 | l->peer_caps = peer_caps; |
c72fa872 | 439 | l->net = net; |
e74a386d | 440 | l->peer_session = ANY_SESSION; |
0e05498e JPM |
441 | l->bearer_id = bearer_id; |
442 | l->tolerance = tolerance; | |
443 | l->net_plane = net_plane; | |
444 | l->advertised_mtu = mtu; | |
445 | l->mtu = mtu; | |
446 | l->priority = priority; | |
447 | tipc_link_set_queue_limits(l, window); | |
c1ab3f1d | 448 | l->ackers = 1; |
52666986 JPM |
449 | l->bc_sndlink = bc_sndlink; |
450 | l->bc_rcvlink = bc_rcvlink; | |
440d8963 JPM |
451 | l->inputq = inputq; |
452 | l->namedq = namedq; | |
453 | l->state = LINK_RESETTING; | |
440d8963 JPM |
454 | __skb_queue_head_init(&l->transmq); |
455 | __skb_queue_head_init(&l->backlogq); | |
456 | __skb_queue_head_init(&l->deferdq); | |
457 | skb_queue_head_init(&l->wakeupq); | |
458 | skb_queue_head_init(l->inputq); | |
459 | return true; | |
b97bf3fd PL |
460 | } |
461 | ||
32301906 JPM |
462 | /** |
463 | * tipc_link_bc_create - create new link to be used for broadcast | |
464 | * @n: pointer to associated node | |
465 | * @mtu: mtu to be used | |
466 | * @window: send window to be used | |
467 | * @inputq: queue to put messages ready for delivery | |
468 | * @namedq: queue to put binding table update messages ready for delivery | |
469 | * @link: return value, pointer to put the created link | |
470 | * | |
471 | * Returns true if link was created, otherwise false | |
472 | */ | |
c72fa872 | 473 | bool tipc_link_bc_create(struct net *net, u32 ownnode, u32 peer, |
52666986 | 474 | int mtu, int window, u16 peer_caps, |
32301906 JPM |
475 | struct sk_buff_head *inputq, |
476 | struct sk_buff_head *namedq, | |
52666986 | 477 | struct tipc_link *bc_sndlink, |
32301906 JPM |
478 | struct tipc_link **link) |
479 | { | |
480 | struct tipc_link *l; | |
481 | ||
c72fa872 | 482 | if (!tipc_link_create(net, "", MAX_BEARERS, 0, 'Z', mtu, 0, window, |
2af5ae37 | 483 | 0, ownnode, peer, peer_caps, bc_sndlink, |
52666986 | 484 | NULL, inputq, namedq, link)) |
32301906 JPM |
485 | return false; |
486 | ||
487 | l = *link; | |
488 | strcpy(l->name, tipc_bclink_name); | |
489 | tipc_link_reset(l); | |
52666986 | 490 | l->state = LINK_RESET; |
2f566124 | 491 | l->ackers = 0; |
52666986 | 492 | l->bc_rcvlink = l; |
32301906 | 493 | |
52666986 JPM |
494 | /* Broadcast send link is always up */ |
495 | if (link_is_bc_sndlink(l)) | |
496 | l->state = LINK_ESTABLISHED; | |
d999297c | 497 | |
52666986 | 498 | return true; |
d999297c JPM |
499 | } |
500 | ||
6ab30f9c JPM |
501 | /** |
502 | * tipc_link_fsm_evt - link finite state machine | |
503 | * @l: pointer to link | |
504 | * @evt: state machine event to be processed | |
6ab30f9c | 505 | */ |
662921cd | 506 | int tipc_link_fsm_evt(struct tipc_link *l, int evt) |
6ab30f9c | 507 | { |
5045f7b9 | 508 | int rc = 0; |
6ab30f9c JPM |
509 | |
510 | switch (l->state) { | |
662921cd | 511 | case LINK_RESETTING: |
6ab30f9c | 512 | switch (evt) { |
662921cd JPM |
513 | case LINK_PEER_RESET_EVT: |
514 | l->state = LINK_PEER_RESET; | |
6ab30f9c | 515 | break; |
662921cd JPM |
516 | case LINK_RESET_EVT: |
517 | l->state = LINK_RESET; | |
518 | break; | |
519 | case LINK_FAILURE_EVT: | |
520 | case LINK_FAILOVER_BEGIN_EVT: | |
521 | case LINK_ESTABLISH_EVT: | |
522 | case LINK_FAILOVER_END_EVT: | |
523 | case LINK_SYNCH_BEGIN_EVT: | |
524 | case LINK_SYNCH_END_EVT: | |
525 | default: | |
526 | goto illegal_evt; | |
527 | } | |
528 | break; | |
529 | case LINK_RESET: | |
530 | switch (evt) { | |
531 | case LINK_PEER_RESET_EVT: | |
532 | l->state = LINK_ESTABLISHING; | |
6ab30f9c | 533 | break; |
662921cd JPM |
534 | case LINK_FAILOVER_BEGIN_EVT: |
535 | l->state = LINK_FAILINGOVER; | |
536 | case LINK_FAILURE_EVT: | |
537 | case LINK_RESET_EVT: | |
538 | case LINK_ESTABLISH_EVT: | |
539 | case LINK_FAILOVER_END_EVT: | |
6ab30f9c | 540 | break; |
662921cd JPM |
541 | case LINK_SYNCH_BEGIN_EVT: |
542 | case LINK_SYNCH_END_EVT: | |
6ab30f9c | 543 | default: |
662921cd | 544 | goto illegal_evt; |
6ab30f9c JPM |
545 | } |
546 | break; | |
662921cd | 547 | case LINK_PEER_RESET: |
6ab30f9c | 548 | switch (evt) { |
662921cd JPM |
549 | case LINK_RESET_EVT: |
550 | l->state = LINK_ESTABLISHING; | |
6ab30f9c | 551 | break; |
662921cd JPM |
552 | case LINK_PEER_RESET_EVT: |
553 | case LINK_ESTABLISH_EVT: | |
554 | case LINK_FAILURE_EVT: | |
6ab30f9c | 555 | break; |
662921cd JPM |
556 | case LINK_SYNCH_BEGIN_EVT: |
557 | case LINK_SYNCH_END_EVT: | |
558 | case LINK_FAILOVER_BEGIN_EVT: | |
559 | case LINK_FAILOVER_END_EVT: | |
560 | default: | |
561 | goto illegal_evt; | |
562 | } | |
563 | break; | |
564 | case LINK_FAILINGOVER: | |
565 | switch (evt) { | |
566 | case LINK_FAILOVER_END_EVT: | |
567 | l->state = LINK_RESET; | |
6ab30f9c | 568 | break; |
662921cd JPM |
569 | case LINK_PEER_RESET_EVT: |
570 | case LINK_RESET_EVT: | |
571 | case LINK_ESTABLISH_EVT: | |
572 | case LINK_FAILURE_EVT: | |
573 | break; | |
574 | case LINK_FAILOVER_BEGIN_EVT: | |
575 | case LINK_SYNCH_BEGIN_EVT: | |
576 | case LINK_SYNCH_END_EVT: | |
6ab30f9c | 577 | default: |
662921cd | 578 | goto illegal_evt; |
6ab30f9c JPM |
579 | } |
580 | break; | |
662921cd | 581 | case LINK_ESTABLISHING: |
6ab30f9c | 582 | switch (evt) { |
662921cd JPM |
583 | case LINK_ESTABLISH_EVT: |
584 | l->state = LINK_ESTABLISHED; | |
6ab30f9c | 585 | break; |
662921cd JPM |
586 | case LINK_FAILOVER_BEGIN_EVT: |
587 | l->state = LINK_FAILINGOVER; | |
588 | break; | |
662921cd | 589 | case LINK_RESET_EVT: |
73f646ce JPM |
590 | l->state = LINK_RESET; |
591 | break; | |
662921cd | 592 | case LINK_FAILURE_EVT: |
73f646ce | 593 | case LINK_PEER_RESET_EVT: |
662921cd JPM |
594 | case LINK_SYNCH_BEGIN_EVT: |
595 | case LINK_FAILOVER_END_EVT: | |
596 | break; | |
597 | case LINK_SYNCH_END_EVT: | |
598 | default: | |
599 | goto illegal_evt; | |
600 | } | |
601 | break; | |
602 | case LINK_ESTABLISHED: | |
603 | switch (evt) { | |
604 | case LINK_PEER_RESET_EVT: | |
605 | l->state = LINK_PEER_RESET; | |
606 | rc |= TIPC_LINK_DOWN_EVT; | |
607 | break; | |
608 | case LINK_FAILURE_EVT: | |
609 | l->state = LINK_RESETTING; | |
610 | rc |= TIPC_LINK_DOWN_EVT; | |
6ab30f9c | 611 | break; |
662921cd JPM |
612 | case LINK_RESET_EVT: |
613 | l->state = LINK_RESET; | |
6ab30f9c | 614 | break; |
662921cd | 615 | case LINK_ESTABLISH_EVT: |
5ae2f8e6 | 616 | case LINK_SYNCH_END_EVT: |
6ab30f9c | 617 | break; |
662921cd JPM |
618 | case LINK_SYNCH_BEGIN_EVT: |
619 | l->state = LINK_SYNCHING; | |
620 | break; | |
662921cd JPM |
621 | case LINK_FAILOVER_BEGIN_EVT: |
622 | case LINK_FAILOVER_END_EVT: | |
6ab30f9c | 623 | default: |
662921cd | 624 | goto illegal_evt; |
6ab30f9c JPM |
625 | } |
626 | break; | |
662921cd | 627 | case LINK_SYNCHING: |
6ab30f9c | 628 | switch (evt) { |
662921cd JPM |
629 | case LINK_PEER_RESET_EVT: |
630 | l->state = LINK_PEER_RESET; | |
631 | rc |= TIPC_LINK_DOWN_EVT; | |
632 | break; | |
633 | case LINK_FAILURE_EVT: | |
634 | l->state = LINK_RESETTING; | |
635 | rc |= TIPC_LINK_DOWN_EVT; | |
6ab30f9c | 636 | break; |
662921cd JPM |
637 | case LINK_RESET_EVT: |
638 | l->state = LINK_RESET; | |
6ab30f9c | 639 | break; |
662921cd JPM |
640 | case LINK_ESTABLISH_EVT: |
641 | case LINK_SYNCH_BEGIN_EVT: | |
6ab30f9c | 642 | break; |
662921cd JPM |
643 | case LINK_SYNCH_END_EVT: |
644 | l->state = LINK_ESTABLISHED; | |
645 | break; | |
646 | case LINK_FAILOVER_BEGIN_EVT: | |
647 | case LINK_FAILOVER_END_EVT: | |
6ab30f9c | 648 | default: |
662921cd | 649 | goto illegal_evt; |
6ab30f9c JPM |
650 | } |
651 | break; | |
652 | default: | |
662921cd | 653 | pr_err("Unknown FSM state %x in %s\n", l->state, l->name); |
6ab30f9c | 654 | } |
662921cd JPM |
655 | return rc; |
656 | illegal_evt: | |
657 | pr_err("Illegal FSM event %x in state %x on link %s\n", | |
658 | evt, l->state, l->name); | |
6ab30f9c JPM |
659 | return rc; |
660 | } | |
661 | ||
333ef69e JPM |
662 | /* link_profile_stats - update statistical profiling of traffic |
663 | */ | |
664 | static void link_profile_stats(struct tipc_link *l) | |
665 | { | |
666 | struct sk_buff *skb; | |
667 | struct tipc_msg *msg; | |
668 | int length; | |
669 | ||
670 | /* Update counters used in statistical profiling of send traffic */ | |
671 | l->stats.accu_queue_sz += skb_queue_len(&l->transmq); | |
672 | l->stats.queue_sz_counts++; | |
673 | ||
674 | skb = skb_peek(&l->transmq); | |
675 | if (!skb) | |
676 | return; | |
677 | msg = buf_msg(skb); | |
678 | length = msg_size(msg); | |
679 | ||
680 | if (msg_user(msg) == MSG_FRAGMENTER) { | |
681 | if (msg_type(msg) != FIRST_FRAGMENT) | |
682 | return; | |
683 | length = msg_size(msg_get_wrapped(msg)); | |
684 | } | |
685 | l->stats.msg_lengths_total += length; | |
686 | l->stats.msg_length_counts++; | |
687 | if (length <= 64) | |
688 | l->stats.msg_length_profile[0]++; | |
689 | else if (length <= 256) | |
690 | l->stats.msg_length_profile[1]++; | |
691 | else if (length <= 1024) | |
692 | l->stats.msg_length_profile[2]++; | |
693 | else if (length <= 4096) | |
694 | l->stats.msg_length_profile[3]++; | |
695 | else if (length <= 16384) | |
696 | l->stats.msg_length_profile[4]++; | |
697 | else if (length <= 32768) | |
698 | l->stats.msg_length_profile[5]++; | |
699 | else | |
700 | l->stats.msg_length_profile[6]++; | |
701 | } | |
702 | ||
703 | /* tipc_link_timeout - perform periodic task as instructed from node timeout | |
704 | */ | |
705 | int tipc_link_timeout(struct tipc_link *l, struct sk_buff_head *xmitq) | |
706 | { | |
42b18f60 JPM |
707 | int mtyp, rc = 0; |
708 | bool state = false; | |
709 | bool probe = false; | |
710 | bool setup = false; | |
52666986 JPM |
711 | u16 bc_snt = l->bc_sndlink->snd_nxt - 1; |
712 | u16 bc_acked = l->bc_rcvlink->acked; | |
333ef69e JPM |
713 | |
714 | link_profile_stats(l); | |
5045f7b9 | 715 | |
662921cd JPM |
716 | switch (l->state) { |
717 | case LINK_ESTABLISHED: | |
718 | case LINK_SYNCHING: | |
42b18f60 JPM |
719 | if (l->silent_intv_cnt > l->abort_limit) |
720 | return tipc_link_fsm_evt(l, LINK_FAILURE_EVT); | |
721 | mtyp = STATE_MSG; | |
722 | state = bc_acked != bc_snt; | |
723 | probe = l->silent_intv_cnt; | |
8cee83dd | 724 | l->silent_intv_cnt++; |
662921cd JPM |
725 | break; |
726 | case LINK_RESET: | |
42b18f60 JPM |
727 | setup = l->rst_cnt++ <= 4; |
728 | setup |= !(l->rst_cnt % 16); | |
5045f7b9 | 729 | mtyp = RESET_MSG; |
662921cd JPM |
730 | break; |
731 | case LINK_ESTABLISHING: | |
42b18f60 | 732 | setup = true; |
5045f7b9 | 733 | mtyp = ACTIVATE_MSG; |
662921cd | 734 | break; |
662921cd | 735 | case LINK_PEER_RESET: |
598411d7 | 736 | case LINK_RESETTING: |
662921cd JPM |
737 | case LINK_FAILINGOVER: |
738 | break; | |
739 | default: | |
740 | break; | |
5045f7b9 | 741 | } |
662921cd | 742 | |
42b18f60 JPM |
743 | if (state || probe || setup) |
744 | tipc_link_build_proto_msg(l, mtyp, probe, 0, 0, 0, xmitq); | |
5045f7b9 | 745 | |
333ef69e JPM |
746 | return rc; |
747 | } | |
748 | ||
b97bf3fd | 749 | /** |
3127a020 | 750 | * link_schedule_user - schedule a message sender for wakeup after congestion |
50100a5e | 751 | * @link: congested link |
3127a020 | 752 | * @list: message that was attempted sent |
50100a5e | 753 | * Create pseudo msg to send back to user when congestion abates |
22d85c79 | 754 | * Does not consume buffer list |
b97bf3fd | 755 | */ |
3127a020 | 756 | static int link_schedule_user(struct tipc_link *link, struct sk_buff_head *list) |
b97bf3fd | 757 | { |
3127a020 JPM |
758 | struct tipc_msg *msg = buf_msg(skb_peek(list)); |
759 | int imp = msg_importance(msg); | |
760 | u32 oport = msg_origport(msg); | |
e74a386d | 761 | u32 addr = tipc_own_addr(link->net); |
3127a020 JPM |
762 | struct sk_buff *skb; |
763 | ||
764 | /* This really cannot happen... */ | |
765 | if (unlikely(imp > TIPC_CRITICAL_IMPORTANCE)) { | |
766 | pr_warn("%s<%s>, send queue full", link_rst_msg, link->name); | |
22d85c79 | 767 | return -ENOBUFS; |
3127a020 JPM |
768 | } |
769 | /* Non-blocking sender: */ | |
770 | if (TIPC_SKB_CB(skb_peek(list))->wakeup_pending) | |
771 | return -ELINKCONG; | |
772 | ||
773 | /* Create and schedule wakeup pseudo message */ | |
774 | skb = tipc_msg_create(SOCK_WAKEUP, 0, INT_H_SIZE, 0, | |
775 | addr, addr, oport, 0, 0); | |
776 | if (!skb) | |
22d85c79 | 777 | return -ENOBUFS; |
3127a020 JPM |
778 | TIPC_SKB_CB(skb)->chain_sz = skb_queue_len(list); |
779 | TIPC_SKB_CB(skb)->chain_imp = imp; | |
780 | skb_queue_tail(&link->wakeupq, skb); | |
50100a5e | 781 | link->stats.link_congs++; |
3127a020 | 782 | return -ELINKCONG; |
b97bf3fd PL |
783 | } |
784 | ||
50100a5e JPM |
785 | /** |
786 | * link_prepare_wakeup - prepare users for wakeup after congestion | |
787 | * @link: congested link | |
788 | * Move a number of waiting users, as permitted by available space in | |
789 | * the send queue, from link wait queue to node wait queue for wakeup | |
790 | */ | |
1f66d161 | 791 | void link_prepare_wakeup(struct tipc_link *l) |
b97bf3fd | 792 | { |
1f66d161 JPM |
793 | int pnd[TIPC_SYSTEM_IMPORTANCE + 1] = {0,}; |
794 | int imp, lim; | |
58d78b32 | 795 | struct sk_buff *skb, *tmp; |
50100a5e | 796 | |
1f66d161 JPM |
797 | skb_queue_walk_safe(&l->wakeupq, skb, tmp) { |
798 | imp = TIPC_SKB_CB(skb)->chain_imp; | |
799 | lim = l->window + l->backlog[imp].limit; | |
800 | pnd[imp] += TIPC_SKB_CB(skb)->chain_sz; | |
801 | if ((pnd[imp] + l->backlog[imp].len) >= lim) | |
b97bf3fd | 802 | break; |
1f66d161 | 803 | skb_unlink(skb, &l->wakeupq); |
d39bbd44 | 804 | skb_queue_tail(l->inputq, skb); |
b97bf3fd | 805 | } |
b97bf3fd PL |
806 | } |
807 | ||
6e498158 | 808 | void tipc_link_reset(struct tipc_link *l) |
b97bf3fd | 809 | { |
e74a386d JPM |
810 | l->peer_session = ANY_SESSION; |
811 | l->session++; | |
6e498158 | 812 | l->mtu = l->advertised_mtu; |
6e498158 JPM |
813 | __skb_queue_purge(&l->transmq); |
814 | __skb_queue_purge(&l->deferdq); | |
23d8335d | 815 | skb_queue_splice_init(&l->wakeupq, l->inputq); |
2af5ae37 JPM |
816 | __skb_queue_purge(&l->backlogq); |
817 | l->backlog[TIPC_LOW_IMPORTANCE].len = 0; | |
818 | l->backlog[TIPC_MEDIUM_IMPORTANCE].len = 0; | |
819 | l->backlog[TIPC_HIGH_IMPORTANCE].len = 0; | |
820 | l->backlog[TIPC_CRITICAL_IMPORTANCE].len = 0; | |
821 | l->backlog[TIPC_SYSTEM_IMPORTANCE].len = 0; | |
6e498158 JPM |
822 | kfree_skb(l->reasm_buf); |
823 | kfree_skb(l->failover_reasm_skb); | |
824 | l->reasm_buf = NULL; | |
825 | l->failover_reasm_skb = NULL; | |
826 | l->rcv_unacked = 0; | |
827 | l->snd_nxt = 1; | |
828 | l->rcv_nxt = 1; | |
c1ab3f1d | 829 | l->acked = 0; |
6e498158 | 830 | l->silent_intv_cnt = 0; |
88e8ac70 | 831 | l->rst_cnt = 0; |
6e498158 JPM |
832 | l->stats.recv_info = 0; |
833 | l->stale_count = 0; | |
52666986 | 834 | l->bc_peer_is_up = false; |
38206d59 | 835 | tipc_link_reset_stats(l); |
b97bf3fd PL |
836 | } |
837 | ||
af9b028e JPM |
838 | /** |
839 | * tipc_link_xmit(): enqueue buffer list according to queue situation | |
840 | * @link: link to use | |
841 | * @list: chain of buffers containing message | |
842 | * @xmitq: returned list of packets to be sent by caller | |
843 | * | |
844 | * Consumes the buffer chain, except when returning -ELINKCONG, | |
845 | * since the caller then may want to make more send attempts. | |
846 | * Returns 0 if success, or errno: -ELINKCONG, -EMSGSIZE or -ENOBUFS | |
847 | * Messages at TIPC_SYSTEM_IMPORTANCE are always accepted | |
848 | */ | |
849 | int tipc_link_xmit(struct tipc_link *l, struct sk_buff_head *list, | |
850 | struct sk_buff_head *xmitq) | |
851 | { | |
852 | struct tipc_msg *hdr = buf_msg(skb_peek(list)); | |
853 | unsigned int maxwin = l->window; | |
854 | unsigned int i, imp = msg_importance(hdr); | |
855 | unsigned int mtu = l->mtu; | |
856 | u16 ack = l->rcv_nxt - 1; | |
857 | u16 seqno = l->snd_nxt; | |
52666986 | 858 | u16 bc_ack = l->bc_rcvlink->rcv_nxt - 1; |
af9b028e JPM |
859 | struct sk_buff_head *transmq = &l->transmq; |
860 | struct sk_buff_head *backlogq = &l->backlogq; | |
861 | struct sk_buff *skb, *_skb, *bskb; | |
862 | ||
863 | /* Match msg importance against this and all higher backlog limits: */ | |
864 | for (i = imp; i <= TIPC_SYSTEM_IMPORTANCE; i++) { | |
865 | if (unlikely(l->backlog[i].len >= l->backlog[i].limit)) | |
866 | return link_schedule_user(l, list); | |
867 | } | |
4952cd3e RA |
868 | if (unlikely(msg_size(hdr) > mtu)) { |
869 | skb_queue_purge(list); | |
af9b028e | 870 | return -EMSGSIZE; |
4952cd3e | 871 | } |
af9b028e JPM |
872 | |
873 | /* Prepare each packet for sending, and add to relevant queue: */ | |
874 | while (skb_queue_len(list)) { | |
875 | skb = skb_peek(list); | |
876 | hdr = buf_msg(skb); | |
877 | msg_set_seqno(hdr, seqno); | |
878 | msg_set_ack(hdr, ack); | |
52666986 | 879 | msg_set_bcast_ack(hdr, bc_ack); |
af9b028e JPM |
880 | |
881 | if (likely(skb_queue_len(transmq) < maxwin)) { | |
882 | _skb = skb_clone(skb, GFP_ATOMIC); | |
4952cd3e RA |
883 | if (!_skb) { |
884 | skb_queue_purge(list); | |
af9b028e | 885 | return -ENOBUFS; |
4952cd3e | 886 | } |
af9b028e JPM |
887 | __skb_dequeue(list); |
888 | __skb_queue_tail(transmq, skb); | |
889 | __skb_queue_tail(xmitq, _skb); | |
c1ab3f1d | 890 | TIPC_SKB_CB(skb)->ackers = l->ackers; |
af9b028e JPM |
891 | l->rcv_unacked = 0; |
892 | seqno++; | |
893 | continue; | |
894 | } | |
895 | if (tipc_msg_bundle(skb_peek_tail(backlogq), hdr, mtu)) { | |
896 | kfree_skb(__skb_dequeue(list)); | |
897 | l->stats.sent_bundled++; | |
898 | continue; | |
899 | } | |
900 | if (tipc_msg_make_bundle(&bskb, hdr, mtu, l->addr)) { | |
901 | kfree_skb(__skb_dequeue(list)); | |
902 | __skb_queue_tail(backlogq, bskb); | |
903 | l->backlog[msg_importance(buf_msg(bskb))].len++; | |
904 | l->stats.sent_bundled++; | |
905 | l->stats.sent_bundles++; | |
906 | continue; | |
907 | } | |
908 | l->backlog[imp].len += skb_queue_len(list); | |
909 | skb_queue_splice_tail_init(list, backlogq); | |
910 | } | |
911 | l->snd_nxt = seqno; | |
912 | return 0; | |
913 | } | |
914 | ||
d999297c JPM |
915 | void tipc_link_advance_backlog(struct tipc_link *l, struct sk_buff_head *xmitq) |
916 | { | |
917 | struct sk_buff *skb, *_skb; | |
918 | struct tipc_msg *hdr; | |
919 | u16 seqno = l->snd_nxt; | |
920 | u16 ack = l->rcv_nxt - 1; | |
52666986 | 921 | u16 bc_ack = l->bc_rcvlink->rcv_nxt - 1; |
d999297c JPM |
922 | |
923 | while (skb_queue_len(&l->transmq) < l->window) { | |
924 | skb = skb_peek(&l->backlogq); | |
925 | if (!skb) | |
926 | break; | |
927 | _skb = skb_clone(skb, GFP_ATOMIC); | |
928 | if (!_skb) | |
929 | break; | |
930 | __skb_dequeue(&l->backlogq); | |
931 | hdr = buf_msg(skb); | |
932 | l->backlog[msg_importance(hdr)].len--; | |
933 | __skb_queue_tail(&l->transmq, skb); | |
934 | __skb_queue_tail(xmitq, _skb); | |
c1ab3f1d | 935 | TIPC_SKB_CB(skb)->ackers = l->ackers; |
d999297c | 936 | msg_set_seqno(hdr, seqno); |
52666986 JPM |
937 | msg_set_ack(hdr, ack); |
938 | msg_set_bcast_ack(hdr, bc_ack); | |
d999297c JPM |
939 | l->rcv_unacked = 0; |
940 | seqno++; | |
941 | } | |
942 | l->snd_nxt = seqno; | |
943 | } | |
944 | ||
52666986 | 945 | static void link_retransmit_failure(struct tipc_link *l, struct sk_buff *skb) |
d356eeba | 946 | { |
52666986 JPM |
947 | struct tipc_msg *hdr = buf_msg(skb); |
948 | ||
949 | pr_warn("Retransmission failure on link <%s>\n", l->name); | |
950 | link_print(l, "Resetting link "); | |
951 | pr_info("Failed msg: usr %u, typ %u, len %u, err %u\n", | |
952 | msg_user(hdr), msg_type(hdr), msg_size(hdr), msg_errcode(hdr)); | |
953 | pr_info("sqno %u, prev: %x, src: %x\n", | |
954 | msg_seqno(hdr), msg_prevnode(hdr), msg_orignode(hdr)); | |
d356eeba AS |
955 | } |
956 | ||
c1ab3f1d JPM |
957 | int tipc_link_retrans(struct tipc_link *l, u16 from, u16 to, |
958 | struct sk_buff_head *xmitq) | |
d999297c JPM |
959 | { |
960 | struct sk_buff *_skb, *skb = skb_peek(&l->transmq); | |
961 | struct tipc_msg *hdr; | |
c1ab3f1d | 962 | u16 ack = l->rcv_nxt - 1; |
52666986 | 963 | u16 bc_ack = l->bc_rcvlink->rcv_nxt - 1; |
d999297c JPM |
964 | |
965 | if (!skb) | |
966 | return 0; | |
967 | ||
968 | /* Detect repeated retransmit failures on same packet */ | |
969 | if (likely(l->last_retransm != buf_seqno(skb))) { | |
970 | l->last_retransm = buf_seqno(skb); | |
971 | l->stale_count = 1; | |
972 | } else if (++l->stale_count > 100) { | |
973 | link_retransmit_failure(l, skb); | |
662921cd | 974 | return tipc_link_fsm_evt(l, LINK_FAILURE_EVT); |
d999297c | 975 | } |
c1ab3f1d JPM |
976 | |
977 | /* Move forward to where retransmission should start */ | |
d999297c | 978 | skb_queue_walk(&l->transmq, skb) { |
c1ab3f1d JPM |
979 | if (!less(buf_seqno(skb), from)) |
980 | break; | |
981 | } | |
982 | ||
983 | skb_queue_walk_from(&l->transmq, skb) { | |
984 | if (more(buf_seqno(skb), to)) | |
985 | break; | |
d999297c JPM |
986 | hdr = buf_msg(skb); |
987 | _skb = __pskb_copy(skb, MIN_H_SIZE, GFP_ATOMIC); | |
988 | if (!_skb) | |
989 | return 0; | |
990 | hdr = buf_msg(_skb); | |
c1ab3f1d JPM |
991 | msg_set_ack(hdr, ack); |
992 | msg_set_bcast_ack(hdr, bc_ack); | |
d999297c JPM |
993 | _skb->priority = TC_PRIO_CONTROL; |
994 | __skb_queue_tail(xmitq, _skb); | |
d999297c JPM |
995 | l->stats.retransmitted++; |
996 | } | |
997 | return 0; | |
998 | } | |
999 | ||
c637c103 | 1000 | /* tipc_data_input - deliver data and name distr msgs to upper layer |
7ae934be | 1001 | * |
c637c103 | 1002 | * Consumes buffer if message is of right type |
7ae934be EH |
1003 | * Node lock must be held |
1004 | */ | |
52666986 | 1005 | static bool tipc_data_input(struct tipc_link *l, struct sk_buff *skb, |
9073fb8b | 1006 | struct sk_buff_head *inputq) |
7ae934be | 1007 | { |
9073fb8b | 1008 | switch (msg_user(buf_msg(skb))) { |
c637c103 JPM |
1009 | case TIPC_LOW_IMPORTANCE: |
1010 | case TIPC_MEDIUM_IMPORTANCE: | |
1011 | case TIPC_HIGH_IMPORTANCE: | |
1012 | case TIPC_CRITICAL_IMPORTANCE: | |
1013 | case CONN_MANAGER: | |
9945e804 | 1014 | skb_queue_tail(inputq, skb); |
c637c103 | 1015 | return true; |
7ae934be | 1016 | case NAME_DISTRIBUTOR: |
52666986 JPM |
1017 | l->bc_rcvlink->state = LINK_ESTABLISHED; |
1018 | skb_queue_tail(l->namedq, skb); | |
c637c103 JPM |
1019 | return true; |
1020 | case MSG_BUNDLER: | |
dff29b1a | 1021 | case TUNNEL_PROTOCOL: |
c637c103 | 1022 | case MSG_FRAGMENTER: |
7ae934be | 1023 | case BCAST_PROTOCOL: |
c637c103 | 1024 | return false; |
7ae934be | 1025 | default: |
c637c103 JPM |
1026 | pr_warn("Dropping received illegal msg type\n"); |
1027 | kfree_skb(skb); | |
1028 | return false; | |
1029 | }; | |
7ae934be | 1030 | } |
c637c103 JPM |
1031 | |
1032 | /* tipc_link_input - process packet that has passed link protocol check | |
1033 | * | |
1034 | * Consumes buffer | |
7ae934be | 1035 | */ |
9073fb8b JPM |
1036 | static int tipc_link_input(struct tipc_link *l, struct sk_buff *skb, |
1037 | struct sk_buff_head *inputq) | |
7ae934be | 1038 | { |
6e498158 JPM |
1039 | struct tipc_msg *hdr = buf_msg(skb); |
1040 | struct sk_buff **reasm_skb = &l->reasm_buf; | |
c637c103 | 1041 | struct sk_buff *iskb; |
9945e804 | 1042 | struct sk_buff_head tmpq; |
6e498158 | 1043 | int usr = msg_user(hdr); |
6144a996 | 1044 | int rc = 0; |
6e498158 JPM |
1045 | int pos = 0; |
1046 | int ipos = 0; | |
c637c103 | 1047 | |
6e498158 JPM |
1048 | if (unlikely(usr == TUNNEL_PROTOCOL)) { |
1049 | if (msg_type(hdr) == SYNCH_MSG) { | |
1050 | __skb_queue_purge(&l->deferdq); | |
1051 | goto drop; | |
8b4ed863 | 1052 | } |
6e498158 JPM |
1053 | if (!tipc_msg_extract(skb, &iskb, &ipos)) |
1054 | return rc; | |
1055 | kfree_skb(skb); | |
1056 | skb = iskb; | |
1057 | hdr = buf_msg(skb); | |
1058 | if (less(msg_seqno(hdr), l->drop_point)) | |
1059 | goto drop; | |
9073fb8b | 1060 | if (tipc_data_input(l, skb, inputq)) |
6e498158 JPM |
1061 | return rc; |
1062 | usr = msg_user(hdr); | |
1063 | reasm_skb = &l->failover_reasm_skb; | |
1064 | } | |
c637c103 | 1065 | |
6e498158 | 1066 | if (usr == MSG_BUNDLER) { |
9945e804 | 1067 | skb_queue_head_init(&tmpq); |
6e498158 JPM |
1068 | l->stats.recv_bundles++; |
1069 | l->stats.recv_bundled += msg_msgcnt(hdr); | |
c637c103 | 1070 | while (tipc_msg_extract(skb, &iskb, &pos)) |
9945e804 JPM |
1071 | tipc_data_input(l, iskb, &tmpq); |
1072 | tipc_skb_queue_splice_tail(&tmpq, inputq); | |
662921cd | 1073 | return 0; |
6e498158 JPM |
1074 | } else if (usr == MSG_FRAGMENTER) { |
1075 | l->stats.recv_fragments++; | |
1076 | if (tipc_buf_append(reasm_skb, &skb)) { | |
1077 | l->stats.recv_fragmented++; | |
9073fb8b | 1078 | tipc_data_input(l, skb, inputq); |
52666986 JPM |
1079 | } else if (!*reasm_skb && !link_is_bc_rcvlink(l)) { |
1080 | pr_warn_ratelimited("Unable to build fragment list\n"); | |
662921cd | 1081 | return tipc_link_fsm_evt(l, LINK_FAILURE_EVT); |
c637c103 | 1082 | } |
662921cd | 1083 | return 0; |
6e498158 | 1084 | } else if (usr == BCAST_PROTOCOL) { |
c72fa872 | 1085 | tipc_bcast_lock(l->net); |
52666986 | 1086 | tipc_link_bc_init_rcv(l->bc_rcvlink, hdr); |
c72fa872 | 1087 | tipc_bcast_unlock(l->net); |
6e498158 JPM |
1088 | } |
1089 | drop: | |
1090 | kfree_skb(skb); | |
662921cd | 1091 | return 0; |
7ae934be EH |
1092 | } |
1093 | ||
d999297c JPM |
1094 | static bool tipc_link_release_pkts(struct tipc_link *l, u16 acked) |
1095 | { | |
1096 | bool released = false; | |
1097 | struct sk_buff *skb, *tmp; | |
1098 | ||
1099 | skb_queue_walk_safe(&l->transmq, skb, tmp) { | |
1100 | if (more(buf_seqno(skb), acked)) | |
1101 | break; | |
1102 | __skb_unlink(skb, &l->transmq); | |
1103 | kfree_skb(skb); | |
1104 | released = true; | |
1105 | } | |
1106 | return released; | |
1107 | } | |
1108 | ||
34b9cd64 | 1109 | /* tipc_link_build_state_msg: prepare link state message for transmission |
52666986 JPM |
1110 | * |
1111 | * Note that sending of broadcast ack is coordinated among nodes, to reduce | |
1112 | * risk of ack storms towards the sender | |
f9aa358a | 1113 | */ |
34b9cd64 | 1114 | int tipc_link_build_state_msg(struct tipc_link *l, struct sk_buff_head *xmitq) |
f9aa358a | 1115 | { |
52666986 JPM |
1116 | if (!l) |
1117 | return 0; | |
1118 | ||
1119 | /* Broadcast ACK must be sent via a unicast link => defer to caller */ | |
1120 | if (link_is_bc_rcvlink(l)) { | |
e74a386d | 1121 | if (((l->rcv_nxt ^ tipc_own_addr(l->net)) & 0xf) != 0xf) |
52666986 JPM |
1122 | return 0; |
1123 | l->rcv_unacked = 0; | |
1124 | return TIPC_LINK_SND_BC_ACK; | |
1125 | } | |
1126 | ||
1127 | /* Unicast ACK */ | |
f9aa358a JPM |
1128 | l->rcv_unacked = 0; |
1129 | l->stats.sent_acks++; | |
1130 | tipc_link_build_proto_msg(l, STATE_MSG, 0, 0, 0, 0, xmitq); | |
52666986 | 1131 | return 0; |
f9aa358a JPM |
1132 | } |
1133 | ||
282b3a05 JPM |
1134 | /* tipc_link_build_reset_msg: prepare link RESET or ACTIVATE message |
1135 | */ | |
1136 | void tipc_link_build_reset_msg(struct tipc_link *l, struct sk_buff_head *xmitq) | |
1137 | { | |
1138 | int mtyp = RESET_MSG; | |
634696b1 | 1139 | struct sk_buff *skb; |
282b3a05 JPM |
1140 | |
1141 | if (l->state == LINK_ESTABLISHING) | |
1142 | mtyp = ACTIVATE_MSG; | |
1143 | ||
1144 | tipc_link_build_proto_msg(l, mtyp, 0, 0, 0, 0, xmitq); | |
634696b1 JPM |
1145 | |
1146 | /* Inform peer that this endpoint is going down if applicable */ | |
1147 | skb = skb_peek_tail(xmitq); | |
1148 | if (skb && (l->state == LINK_RESET)) | |
1149 | msg_set_peer_stopping(buf_msg(skb), 1); | |
282b3a05 JPM |
1150 | } |
1151 | ||
f9aa358a JPM |
1152 | /* tipc_link_build_nack_msg: prepare link nack message for transmission |
1153 | */ | |
1154 | static void tipc_link_build_nack_msg(struct tipc_link *l, | |
1155 | struct sk_buff_head *xmitq) | |
1156 | { | |
1157 | u32 def_cnt = ++l->stats.deferred_recv; | |
1158 | ||
52666986 JPM |
1159 | if (link_is_bc_rcvlink(l)) |
1160 | return; | |
1161 | ||
f9aa358a JPM |
1162 | if ((skb_queue_len(&l->deferdq) == 1) || !(def_cnt % TIPC_NACK_INTV)) |
1163 | tipc_link_build_proto_msg(l, STATE_MSG, 0, 0, 0, 0, xmitq); | |
1164 | } | |
1165 | ||
d999297c | 1166 | /* tipc_link_rcv - process TIPC packets/messages arriving from off-node |
f9aa358a | 1167 | * @l: the link that should handle the message |
d999297c JPM |
1168 | * @skb: TIPC packet |
1169 | * @xmitq: queue to place packets to be sent after this call | |
1170 | */ | |
1171 | int tipc_link_rcv(struct tipc_link *l, struct sk_buff *skb, | |
1172 | struct sk_buff_head *xmitq) | |
1173 | { | |
f9aa358a | 1174 | struct sk_buff_head *defq = &l->deferdq; |
d999297c | 1175 | struct tipc_msg *hdr; |
81204c49 | 1176 | u16 seqno, rcv_nxt, win_lim; |
d999297c JPM |
1177 | int rc = 0; |
1178 | ||
f9aa358a | 1179 | do { |
d999297c | 1180 | hdr = buf_msg(skb); |
f9aa358a JPM |
1181 | seqno = msg_seqno(hdr); |
1182 | rcv_nxt = l->rcv_nxt; | |
81204c49 | 1183 | win_lim = rcv_nxt + TIPC_MAX_LINK_WIN; |
d999297c JPM |
1184 | |
1185 | /* Verify and update link state */ | |
f9aa358a JPM |
1186 | if (unlikely(msg_user(hdr) == LINK_PROTOCOL)) |
1187 | return tipc_link_proto_rcv(l, skb, xmitq); | |
d999297c | 1188 | |
662921cd | 1189 | if (unlikely(!link_is_up(l))) { |
73f646ce JPM |
1190 | if (l->state == LINK_ESTABLISHING) |
1191 | rc = TIPC_LINK_UP_EVT; | |
1192 | goto drop; | |
d999297c JPM |
1193 | } |
1194 | ||
f9aa358a | 1195 | /* Don't send probe at next timeout expiration */ |
d999297c JPM |
1196 | l->silent_intv_cnt = 0; |
1197 | ||
81204c49 JPM |
1198 | /* Drop if outside receive window */ |
1199 | if (unlikely(less(seqno, rcv_nxt) || more(seqno, win_lim))) { | |
1200 | l->stats.duplicates++; | |
1201 | goto drop; | |
1202 | } | |
1203 | ||
d999297c JPM |
1204 | /* Forward queues and wake up waiting users */ |
1205 | if (likely(tipc_link_release_pkts(l, msg_ack(hdr)))) { | |
1206 | tipc_link_advance_backlog(l, xmitq); | |
1207 | if (unlikely(!skb_queue_empty(&l->wakeupq))) | |
1208 | link_prepare_wakeup(l); | |
1209 | } | |
1210 | ||
81204c49 JPM |
1211 | /* Defer delivery if sequence gap */ |
1212 | if (unlikely(seqno != rcv_nxt)) { | |
8306f99a | 1213 | __tipc_skb_queue_sorted(defq, seqno, skb); |
f9aa358a JPM |
1214 | tipc_link_build_nack_msg(l, xmitq); |
1215 | break; | |
d999297c JPM |
1216 | } |
1217 | ||
81204c49 | 1218 | /* Deliver packet */ |
d999297c JPM |
1219 | l->rcv_nxt++; |
1220 | l->stats.recv_info++; | |
f9aa358a | 1221 | if (!tipc_data_input(l, skb, l->inputq)) |
52666986 | 1222 | rc |= tipc_link_input(l, skb, l->inputq); |
f9aa358a | 1223 | if (unlikely(++l->rcv_unacked >= TIPC_MIN_LINK_WIN)) |
34b9cd64 | 1224 | rc |= tipc_link_build_state_msg(l, xmitq); |
52666986 JPM |
1225 | if (unlikely(rc & ~TIPC_LINK_SND_BC_ACK)) |
1226 | break; | |
f9aa358a JPM |
1227 | } while ((skb = __skb_dequeue(defq))); |
1228 | ||
1229 | return rc; | |
1230 | drop: | |
1231 | kfree_skb(skb); | |
d999297c JPM |
1232 | return rc; |
1233 | } | |
1234 | ||
426cc2b8 JPM |
1235 | static void tipc_link_build_proto_msg(struct tipc_link *l, int mtyp, bool probe, |
1236 | u16 rcvgap, int tolerance, int priority, | |
1237 | struct sk_buff_head *xmitq) | |
1238 | { | |
e74a386d JPM |
1239 | struct sk_buff *skb; |
1240 | struct tipc_msg *hdr; | |
1241 | struct sk_buff_head *dfq = &l->deferdq; | |
52666986 | 1242 | bool node_up = link_is_up(l->bc_rcvlink); |
426cc2b8 JPM |
1243 | |
1244 | /* Don't send protocol message during reset or link failover */ | |
662921cd | 1245 | if (tipc_link_is_blocked(l)) |
426cc2b8 JPM |
1246 | return; |
1247 | ||
e74a386d JPM |
1248 | if (!tipc_link_is_up(l) && (mtyp == STATE_MSG)) |
1249 | return; | |
1250 | ||
1251 | if (!skb_queue_empty(dfq)) | |
1252 | rcvgap = buf_seqno(skb_peek(dfq)) - l->rcv_nxt; | |
1253 | ||
1254 | skb = tipc_msg_create(LINK_PROTOCOL, mtyp, INT_H_SIZE, | |
1255 | TIPC_MAX_IF_NAME, l->addr, | |
1256 | tipc_own_addr(l->net), 0, 0, 0); | |
1257 | if (!skb) | |
1258 | return; | |
1259 | ||
1260 | hdr = buf_msg(skb); | |
1261 | msg_set_session(hdr, l->session); | |
1262 | msg_set_bearer_id(hdr, l->bearer_id); | |
426cc2b8 | 1263 | msg_set_net_plane(hdr, l->net_plane); |
52666986 JPM |
1264 | msg_set_next_sent(hdr, l->snd_nxt); |
1265 | msg_set_ack(hdr, l->rcv_nxt - 1); | |
1266 | msg_set_bcast_ack(hdr, l->bc_rcvlink->rcv_nxt - 1); | |
1267 | msg_set_last_bcast(hdr, l->bc_sndlink->snd_nxt - 1); | |
426cc2b8 JPM |
1268 | msg_set_link_tolerance(hdr, tolerance); |
1269 | msg_set_linkprio(hdr, priority); | |
1270 | msg_set_redundant_link(hdr, node_up); | |
1271 | msg_set_seq_gap(hdr, 0); | |
52666986 | 1272 | msg_set_seqno(hdr, l->snd_nxt + U16_MAX / 2); |
426cc2b8 JPM |
1273 | |
1274 | if (mtyp == STATE_MSG) { | |
e74a386d JPM |
1275 | msg_set_seq_gap(hdr, rcvgap); |
1276 | msg_set_size(hdr, INT_H_SIZE); | |
426cc2b8 | 1277 | msg_set_probe(hdr, probe); |
426cc2b8 | 1278 | l->stats.sent_states++; |
52666986 | 1279 | l->rcv_unacked = 0; |
426cc2b8 JPM |
1280 | } else { |
1281 | /* RESET_MSG or ACTIVATE_MSG */ | |
1282 | msg_set_max_pkt(hdr, l->advertised_mtu); | |
e74a386d | 1283 | strcpy(msg_data(hdr), l->if_name); |
426cc2b8 | 1284 | } |
e74a386d JPM |
1285 | if (probe) |
1286 | l->stats.sent_probes++; | |
1287 | if (rcvgap) | |
1288 | l->stats.sent_nacks++; | |
426cc2b8 | 1289 | skb->priority = TC_PRIO_CONTROL; |
6e498158 | 1290 | __skb_queue_tail(xmitq, skb); |
b97bf3fd PL |
1291 | } |
1292 | ||
6e498158 | 1293 | /* tipc_link_tnl_prepare(): prepare and return a list of tunnel packets |
f9aa358a | 1294 | * with contents of the link's transmit and backlog queues. |
b97bf3fd | 1295 | */ |
6e498158 JPM |
1296 | void tipc_link_tnl_prepare(struct tipc_link *l, struct tipc_link *tnl, |
1297 | int mtyp, struct sk_buff_head *xmitq) | |
b97bf3fd | 1298 | { |
6e498158 JPM |
1299 | struct sk_buff *skb, *tnlskb; |
1300 | struct tipc_msg *hdr, tnlhdr; | |
1301 | struct sk_buff_head *queue = &l->transmq; | |
1302 | struct sk_buff_head tmpxq, tnlq; | |
1303 | u16 pktlen, pktcnt, seqno = l->snd_nxt; | |
b97bf3fd | 1304 | |
6e498158 | 1305 | if (!tnl) |
b97bf3fd PL |
1306 | return; |
1307 | ||
6e498158 JPM |
1308 | skb_queue_head_init(&tnlq); |
1309 | skb_queue_head_init(&tmpxq); | |
dd3f9e70 | 1310 | |
6e498158 JPM |
1311 | /* At least one packet required for safe algorithm => add dummy */ |
1312 | skb = tipc_msg_create(TIPC_LOW_IMPORTANCE, TIPC_DIRECT_MSG, | |
e74a386d | 1313 | BASIC_H_SIZE, 0, l->addr, tipc_own_addr(l->net), |
6e498158 JPM |
1314 | 0, 0, TIPC_ERR_NO_PORT); |
1315 | if (!skb) { | |
1316 | pr_warn("%sunable to create tunnel packet\n", link_co_err); | |
b97bf3fd PL |
1317 | return; |
1318 | } | |
6e498158 JPM |
1319 | skb_queue_tail(&tnlq, skb); |
1320 | tipc_link_xmit(l, &tnlq, &tmpxq); | |
1321 | __skb_queue_purge(&tmpxq); | |
1322 | ||
1323 | /* Initialize reusable tunnel packet header */ | |
e74a386d | 1324 | tipc_msg_init(tipc_own_addr(l->net), &tnlhdr, TUNNEL_PROTOCOL, |
6e498158 JPM |
1325 | mtyp, INT_H_SIZE, l->addr); |
1326 | pktcnt = skb_queue_len(&l->transmq) + skb_queue_len(&l->backlogq); | |
1327 | msg_set_msgcnt(&tnlhdr, pktcnt); | |
1328 | msg_set_bearer_id(&tnlhdr, l->peer_bearer_id); | |
1329 | tnl: | |
1330 | /* Wrap each packet into a tunnel packet */ | |
05dcc5aa | 1331 | skb_queue_walk(queue, skb) { |
6e498158 JPM |
1332 | hdr = buf_msg(skb); |
1333 | if (queue == &l->backlogq) | |
1334 | msg_set_seqno(hdr, seqno++); | |
1335 | pktlen = msg_size(hdr); | |
1336 | msg_set_size(&tnlhdr, pktlen + INT_H_SIZE); | |
1337 | tnlskb = tipc_buf_acquire(pktlen + INT_H_SIZE); | |
1338 | if (!tnlskb) { | |
1339 | pr_warn("%sunable to send packet\n", link_co_err); | |
b97bf3fd PL |
1340 | return; |
1341 | } | |
6e498158 JPM |
1342 | skb_copy_to_linear_data(tnlskb, &tnlhdr, INT_H_SIZE); |
1343 | skb_copy_to_linear_data_offset(tnlskb, INT_H_SIZE, hdr, pktlen); | |
1344 | __skb_queue_tail(&tnlq, tnlskb); | |
b97bf3fd | 1345 | } |
6e498158 JPM |
1346 | if (queue != &l->backlogq) { |
1347 | queue = &l->backlogq; | |
1348 | goto tnl; | |
f006c9c7 | 1349 | } |
1dab3d5a | 1350 | |
6e498158 | 1351 | tipc_link_xmit(tnl, &tnlq, xmitq); |
b97bf3fd | 1352 | |
6e498158 JPM |
1353 | if (mtyp == FAILOVER_MSG) { |
1354 | tnl->drop_point = l->rcv_nxt; | |
1355 | tnl->failover_reasm_skb = l->reasm_buf; | |
1356 | l->reasm_buf = NULL; | |
2da71425 | 1357 | } |
b97bf3fd PL |
1358 | } |
1359 | ||
d999297c JPM |
1360 | /* tipc_link_proto_rcv(): receive link level protocol message : |
1361 | * Note that network plane id propagates through the network, and may | |
1362 | * change at any time. The node with lowest numerical id determines | |
1363 | * network plane | |
1364 | */ | |
1365 | static int tipc_link_proto_rcv(struct tipc_link *l, struct sk_buff *skb, | |
1366 | struct sk_buff_head *xmitq) | |
1367 | { | |
1368 | struct tipc_msg *hdr = buf_msg(skb); | |
1369 | u16 rcvgap = 0; | |
c1ab3f1d JPM |
1370 | u16 ack = msg_ack(hdr); |
1371 | u16 gap = msg_seq_gap(hdr); | |
d999297c JPM |
1372 | u16 peers_snd_nxt = msg_next_sent(hdr); |
1373 | u16 peers_tol = msg_link_tolerance(hdr); | |
1374 | u16 peers_prio = msg_linkprio(hdr); | |
2be80c2d | 1375 | u16 rcv_nxt = l->rcv_nxt; |
73f646ce | 1376 | int mtyp = msg_type(hdr); |
d999297c JPM |
1377 | char *if_name; |
1378 | int rc = 0; | |
1379 | ||
52666986 | 1380 | if (tipc_link_is_blocked(l) || !xmitq) |
d999297c JPM |
1381 | goto exit; |
1382 | ||
e74a386d | 1383 | if (tipc_own_addr(l->net) > msg_prevnode(hdr)) |
d999297c JPM |
1384 | l->net_plane = msg_net_plane(hdr); |
1385 | ||
73f646ce | 1386 | switch (mtyp) { |
d999297c JPM |
1387 | case RESET_MSG: |
1388 | ||
1389 | /* Ignore duplicate RESET with old session number */ | |
1390 | if ((less_eq(msg_session(hdr), l->peer_session)) && | |
e74a386d | 1391 | (l->peer_session != ANY_SESSION)) |
d999297c JPM |
1392 | break; |
1393 | /* fall thru' */ | |
662921cd | 1394 | |
d999297c | 1395 | case ACTIVATE_MSG: |
c7cad0d6 JPM |
1396 | skb_linearize(skb); |
1397 | hdr = buf_msg(skb); | |
d999297c JPM |
1398 | |
1399 | /* Complete own link name with peer's interface name */ | |
1400 | if_name = strrchr(l->name, ':') + 1; | |
1401 | if (sizeof(l->name) - (if_name - l->name) <= TIPC_MAX_IF_NAME) | |
1402 | break; | |
1403 | if (msg_data_sz(hdr) < TIPC_MAX_IF_NAME) | |
1404 | break; | |
1405 | strncpy(if_name, msg_data(hdr), TIPC_MAX_IF_NAME); | |
1406 | ||
1407 | /* Update own tolerance if peer indicates a non-zero value */ | |
1408 | if (in_range(peers_tol, TIPC_MIN_LINK_TOL, TIPC_MAX_LINK_TOL)) | |
1409 | l->tolerance = peers_tol; | |
1410 | ||
1411 | /* Update own priority if peer's priority is higher */ | |
1412 | if (in_range(peers_prio, l->priority + 1, TIPC_MAX_LINK_PRI)) | |
1413 | l->priority = peers_prio; | |
1414 | ||
73f646ce | 1415 | /* ACTIVATE_MSG serves as PEER_RESET if link is already down */ |
634696b1 JPM |
1416 | if (msg_peer_stopping(hdr)) |
1417 | rc = tipc_link_fsm_evt(l, LINK_FAILURE_EVT); | |
1418 | else if ((mtyp == RESET_MSG) || !link_is_up(l)) | |
73f646ce JPM |
1419 | rc = tipc_link_fsm_evt(l, LINK_PEER_RESET_EVT); |
1420 | ||
1421 | /* ACTIVATE_MSG takes up link if it was already locally reset */ | |
1422 | if ((mtyp == ACTIVATE_MSG) && (l->state == LINK_ESTABLISHING)) | |
1423 | rc = TIPC_LINK_UP_EVT; | |
1424 | ||
d999297c JPM |
1425 | l->peer_session = msg_session(hdr); |
1426 | l->peer_bearer_id = msg_bearer_id(hdr); | |
d999297c JPM |
1427 | if (l->mtu > msg_max_pkt(hdr)) |
1428 | l->mtu = msg_max_pkt(hdr); | |
1429 | break; | |
662921cd | 1430 | |
d999297c | 1431 | case STATE_MSG: |
662921cd | 1432 | |
d999297c JPM |
1433 | /* Update own tolerance if peer indicates a non-zero value */ |
1434 | if (in_range(peers_tol, TIPC_MIN_LINK_TOL, TIPC_MAX_LINK_TOL)) | |
1435 | l->tolerance = peers_tol; | |
1436 | ||
81729810 RA |
1437 | if (peers_prio && in_range(peers_prio, TIPC_MIN_LINK_PRI, |
1438 | TIPC_MAX_LINK_PRI)) { | |
1439 | l->priority = peers_prio; | |
1440 | rc = tipc_link_fsm_evt(l, LINK_FAILURE_EVT); | |
1441 | } | |
1442 | ||
d999297c JPM |
1443 | l->silent_intv_cnt = 0; |
1444 | l->stats.recv_states++; | |
1445 | if (msg_probe(hdr)) | |
1446 | l->stats.recv_probes++; | |
73f646ce JPM |
1447 | |
1448 | if (!link_is_up(l)) { | |
1449 | if (l->state == LINK_ESTABLISHING) | |
1450 | rc = TIPC_LINK_UP_EVT; | |
d999297c | 1451 | break; |
73f646ce | 1452 | } |
d999297c | 1453 | |
662921cd | 1454 | /* Send NACK if peer has sent pkts we haven't received yet */ |
2be80c2d | 1455 | if (more(peers_snd_nxt, rcv_nxt) && !tipc_link_is_synching(l)) |
d999297c JPM |
1456 | rcvgap = peers_snd_nxt - l->rcv_nxt; |
1457 | if (rcvgap || (msg_probe(hdr))) | |
1458 | tipc_link_build_proto_msg(l, STATE_MSG, 0, rcvgap, | |
16040894 | 1459 | 0, 0, xmitq); |
c1ab3f1d | 1460 | tipc_link_release_pkts(l, ack); |
d999297c JPM |
1461 | |
1462 | /* If NACK, retransmit will now start at right position */ | |
c1ab3f1d JPM |
1463 | if (gap) { |
1464 | rc = tipc_link_retrans(l, ack + 1, ack + gap, xmitq); | |
d999297c JPM |
1465 | l->stats.recv_nacks++; |
1466 | } | |
662921cd | 1467 | |
d999297c JPM |
1468 | tipc_link_advance_backlog(l, xmitq); |
1469 | if (unlikely(!skb_queue_empty(&l->wakeupq))) | |
1470 | link_prepare_wakeup(l); | |
1471 | } | |
1472 | exit: | |
1473 | kfree_skb(skb); | |
1474 | return rc; | |
1475 | } | |
1476 | ||
52666986 JPM |
1477 | /* tipc_link_build_bc_proto_msg() - create broadcast protocol message |
1478 | */ | |
1479 | static bool tipc_link_build_bc_proto_msg(struct tipc_link *l, bool bcast, | |
1480 | u16 peers_snd_nxt, | |
1481 | struct sk_buff_head *xmitq) | |
1482 | { | |
1483 | struct sk_buff *skb; | |
1484 | struct tipc_msg *hdr; | |
1485 | struct sk_buff *dfrd_skb = skb_peek(&l->deferdq); | |
1486 | u16 ack = l->rcv_nxt - 1; | |
1487 | u16 gap_to = peers_snd_nxt - 1; | |
1488 | ||
1489 | skb = tipc_msg_create(BCAST_PROTOCOL, STATE_MSG, INT_H_SIZE, | |
e74a386d | 1490 | 0, l->addr, tipc_own_addr(l->net), 0, 0, 0); |
52666986 JPM |
1491 | if (!skb) |
1492 | return false; | |
1493 | hdr = buf_msg(skb); | |
1494 | msg_set_last_bcast(hdr, l->bc_sndlink->snd_nxt - 1); | |
1495 | msg_set_bcast_ack(hdr, ack); | |
1496 | msg_set_bcgap_after(hdr, ack); | |
1497 | if (dfrd_skb) | |
1498 | gap_to = buf_seqno(dfrd_skb) - 1; | |
1499 | msg_set_bcgap_to(hdr, gap_to); | |
1500 | msg_set_non_seq(hdr, bcast); | |
1501 | __skb_queue_tail(xmitq, skb); | |
1502 | return true; | |
1503 | } | |
1504 | ||
1505 | /* tipc_link_build_bc_init_msg() - synchronize broadcast link endpoints. | |
1506 | * | |
1507 | * Give a newly added peer node the sequence number where it should | |
1508 | * start receiving and acking broadcast packets. | |
1509 | */ | |
742e0383 WF |
1510 | static void tipc_link_build_bc_init_msg(struct tipc_link *l, |
1511 | struct sk_buff_head *xmitq) | |
52666986 JPM |
1512 | { |
1513 | struct sk_buff_head list; | |
1514 | ||
1515 | __skb_queue_head_init(&list); | |
1516 | if (!tipc_link_build_bc_proto_msg(l->bc_rcvlink, false, 0, &list)) | |
1517 | return; | |
1518 | tipc_link_xmit(l, &list, xmitq); | |
1519 | } | |
1520 | ||
1521 | /* tipc_link_bc_init_rcv - receive initial broadcast synch data from peer | |
1522 | */ | |
1523 | void tipc_link_bc_init_rcv(struct tipc_link *l, struct tipc_msg *hdr) | |
1524 | { | |
1525 | int mtyp = msg_type(hdr); | |
1526 | u16 peers_snd_nxt = msg_bc_snd_nxt(hdr); | |
1527 | ||
1528 | if (link_is_up(l)) | |
1529 | return; | |
1530 | ||
1531 | if (msg_user(hdr) == BCAST_PROTOCOL) { | |
1532 | l->rcv_nxt = peers_snd_nxt; | |
1533 | l->state = LINK_ESTABLISHED; | |
1534 | return; | |
1535 | } | |
1536 | ||
1537 | if (l->peer_caps & TIPC_BCAST_SYNCH) | |
1538 | return; | |
1539 | ||
1540 | if (msg_peer_node_is_up(hdr)) | |
1541 | return; | |
1542 | ||
1543 | /* Compatibility: accept older, less safe initial synch data */ | |
1544 | if ((mtyp == RESET_MSG) || (mtyp == ACTIVATE_MSG)) | |
1545 | l->rcv_nxt = peers_snd_nxt; | |
1546 | } | |
1547 | ||
1548 | /* tipc_link_bc_sync_rcv - update rcv link according to peer's send state | |
1549 | */ | |
1550 | void tipc_link_bc_sync_rcv(struct tipc_link *l, struct tipc_msg *hdr, | |
1551 | struct sk_buff_head *xmitq) | |
1552 | { | |
1553 | u16 peers_snd_nxt = msg_bc_snd_nxt(hdr); | |
1554 | ||
1555 | if (!link_is_up(l)) | |
1556 | return; | |
1557 | ||
1558 | if (!msg_peer_node_is_up(hdr)) | |
1559 | return; | |
1560 | ||
1561 | l->bc_peer_is_up = true; | |
1562 | ||
1563 | /* Ignore if peers_snd_nxt goes beyond receive window */ | |
1564 | if (more(peers_snd_nxt, l->rcv_nxt + l->window)) | |
1565 | return; | |
1566 | ||
1567 | if (!more(peers_snd_nxt, l->rcv_nxt)) { | |
1568 | l->nack_state = BC_NACK_SND_CONDITIONAL; | |
1569 | return; | |
1570 | } | |
1571 | ||
1572 | /* Don't NACK if one was recently sent or peeked */ | |
1573 | if (l->nack_state == BC_NACK_SND_SUPPRESS) { | |
1574 | l->nack_state = BC_NACK_SND_UNCONDITIONAL; | |
1575 | return; | |
1576 | } | |
1577 | ||
1578 | /* Conditionally delay NACK sending until next synch rcv */ | |
1579 | if (l->nack_state == BC_NACK_SND_CONDITIONAL) { | |
1580 | l->nack_state = BC_NACK_SND_UNCONDITIONAL; | |
1581 | if ((peers_snd_nxt - l->rcv_nxt) < TIPC_MIN_LINK_WIN) | |
1582 | return; | |
1583 | } | |
1584 | ||
1585 | /* Send NACK now but suppress next one */ | |
1586 | tipc_link_build_bc_proto_msg(l, true, peers_snd_nxt, xmitq); | |
1587 | l->nack_state = BC_NACK_SND_SUPPRESS; | |
1588 | } | |
1589 | ||
1590 | void tipc_link_bc_ack_rcv(struct tipc_link *l, u16 acked, | |
1591 | struct sk_buff_head *xmitq) | |
1592 | { | |
1593 | struct sk_buff *skb, *tmp; | |
1594 | struct tipc_link *snd_l = l->bc_sndlink; | |
1595 | ||
1596 | if (!link_is_up(l) || !l->bc_peer_is_up) | |
1597 | return; | |
1598 | ||
1599 | if (!more(acked, l->acked)) | |
1600 | return; | |
1601 | ||
1602 | /* Skip over packets peer has already acked */ | |
1603 | skb_queue_walk(&snd_l->transmq, skb) { | |
1604 | if (more(buf_seqno(skb), l->acked)) | |
1605 | break; | |
1606 | } | |
1607 | ||
1608 | /* Update/release the packets peer is acking now */ | |
1609 | skb_queue_walk_from_safe(&snd_l->transmq, skb, tmp) { | |
1610 | if (more(buf_seqno(skb), acked)) | |
1611 | break; | |
1612 | if (!--TIPC_SKB_CB(skb)->ackers) { | |
1613 | __skb_unlink(skb, &snd_l->transmq); | |
1614 | kfree_skb(skb); | |
1615 | } | |
1616 | } | |
1617 | l->acked = acked; | |
1618 | tipc_link_advance_backlog(snd_l, xmitq); | |
1619 | if (unlikely(!skb_queue_empty(&snd_l->wakeupq))) | |
1620 | link_prepare_wakeup(snd_l); | |
1621 | } | |
1622 | ||
1623 | /* tipc_link_bc_nack_rcv(): receive broadcast nack message | |
1624 | */ | |
1625 | int tipc_link_bc_nack_rcv(struct tipc_link *l, struct sk_buff *skb, | |
1626 | struct sk_buff_head *xmitq) | |
1627 | { | |
1628 | struct tipc_msg *hdr = buf_msg(skb); | |
1629 | u32 dnode = msg_destnode(hdr); | |
1630 | int mtyp = msg_type(hdr); | |
1631 | u16 acked = msg_bcast_ack(hdr); | |
1632 | u16 from = acked + 1; | |
1633 | u16 to = msg_bcgap_to(hdr); | |
1634 | u16 peers_snd_nxt = to + 1; | |
1635 | int rc = 0; | |
1636 | ||
1637 | kfree_skb(skb); | |
1638 | ||
1639 | if (!tipc_link_is_up(l) || !l->bc_peer_is_up) | |
1640 | return 0; | |
1641 | ||
1642 | if (mtyp != STATE_MSG) | |
1643 | return 0; | |
1644 | ||
e74a386d | 1645 | if (dnode == tipc_own_addr(l->net)) { |
52666986 JPM |
1646 | tipc_link_bc_ack_rcv(l, acked, xmitq); |
1647 | rc = tipc_link_retrans(l->bc_sndlink, from, to, xmitq); | |
1648 | l->stats.recv_nacks++; | |
1649 | return rc; | |
1650 | } | |
1651 | ||
1652 | /* Msg for other node => suppress own NACK at next sync if applicable */ | |
1653 | if (more(peers_snd_nxt, l->rcv_nxt) && !less(l->rcv_nxt, from)) | |
1654 | l->nack_state = BC_NACK_SND_SUPPRESS; | |
1655 | ||
1656 | return 0; | |
1657 | } | |
1658 | ||
e3eea1eb | 1659 | void tipc_link_set_queue_limits(struct tipc_link *l, u32 win) |
b97bf3fd | 1660 | { |
ed193ece | 1661 | int max_bulk = TIPC_MAX_PUBLICATIONS / (l->mtu / ITEM_SIZE); |
e3eea1eb JPM |
1662 | |
1663 | l->window = win; | |
1f66d161 JPM |
1664 | l->backlog[TIPC_LOW_IMPORTANCE].limit = win / 2; |
1665 | l->backlog[TIPC_MEDIUM_IMPORTANCE].limit = win; | |
1666 | l->backlog[TIPC_HIGH_IMPORTANCE].limit = win / 2 * 3; | |
1667 | l->backlog[TIPC_CRITICAL_IMPORTANCE].limit = win * 2; | |
1668 | l->backlog[TIPC_SYSTEM_IMPORTANCE].limit = max_bulk; | |
b97bf3fd PL |
1669 | } |
1670 | ||
b97bf3fd | 1671 | /** |
38206d59 | 1672 | * link_reset_stats - reset link statistics |
1a90632d | 1673 | * @l: pointer to link |
b97bf3fd | 1674 | */ |
38206d59 | 1675 | void tipc_link_reset_stats(struct tipc_link *l) |
b97bf3fd | 1676 | { |
38206d59 JPM |
1677 | memset(&l->stats, 0, sizeof(l->stats)); |
1678 | if (!link_is_bc_sndlink(l)) { | |
1679 | l->stats.sent_info = l->snd_nxt; | |
1680 | l->stats.recv_info = l->rcv_nxt; | |
1681 | } | |
b97bf3fd PL |
1682 | } |
1683 | ||
1a20cc25 | 1684 | static void link_print(struct tipc_link *l, const char *str) |
b97bf3fd | 1685 | { |
1a20cc25 | 1686 | struct sk_buff *hskb = skb_peek(&l->transmq); |
c1ab3f1d | 1687 | u16 head = hskb ? msg_seqno(buf_msg(hskb)) : l->snd_nxt - 1; |
1a20cc25 | 1688 | u16 tail = l->snd_nxt - 1; |
7a2f7d18 | 1689 | |
662921cd | 1690 | pr_info("%s Link <%s> state %x\n", str, l->name, l->state); |
1a20cc25 JPM |
1691 | pr_info("XMTQ: %u [%u-%u], BKLGQ: %u, SNDNX: %u, RCVNX: %u\n", |
1692 | skb_queue_len(&l->transmq), head, tail, | |
1693 | skb_queue_len(&l->backlogq), l->snd_nxt, l->rcv_nxt); | |
b97bf3fd | 1694 | } |
0655f6a8 RA |
1695 | |
1696 | /* Parse and validate nested (link) properties valid for media, bearer and link | |
1697 | */ | |
1698 | int tipc_nl_parse_link_prop(struct nlattr *prop, struct nlattr *props[]) | |
1699 | { | |
1700 | int err; | |
1701 | ||
1702 | err = nla_parse_nested(props, TIPC_NLA_PROP_MAX, prop, | |
1703 | tipc_nl_prop_policy); | |
1704 | if (err) | |
1705 | return err; | |
1706 | ||
1707 | if (props[TIPC_NLA_PROP_PRIO]) { | |
1708 | u32 prio; | |
1709 | ||
1710 | prio = nla_get_u32(props[TIPC_NLA_PROP_PRIO]); | |
1711 | if (prio > TIPC_MAX_LINK_PRI) | |
1712 | return -EINVAL; | |
1713 | } | |
1714 | ||
1715 | if (props[TIPC_NLA_PROP_TOL]) { | |
1716 | u32 tol; | |
1717 | ||
1718 | tol = nla_get_u32(props[TIPC_NLA_PROP_TOL]); | |
1719 | if ((tol < TIPC_MIN_LINK_TOL) || (tol > TIPC_MAX_LINK_TOL)) | |
1720 | return -EINVAL; | |
1721 | } | |
1722 | ||
1723 | if (props[TIPC_NLA_PROP_WIN]) { | |
1724 | u32 win; | |
1725 | ||
1726 | win = nla_get_u32(props[TIPC_NLA_PROP_WIN]); | |
1727 | if ((win < TIPC_MIN_LINK_WIN) || (win > TIPC_MAX_LINK_WIN)) | |
1728 | return -EINVAL; | |
1729 | } | |
1730 | ||
1731 | return 0; | |
1732 | } | |
7be57fc6 | 1733 | |
d8182804 | 1734 | static int __tipc_nl_add_stats(struct sk_buff *skb, struct tipc_stats *s) |
7be57fc6 RA |
1735 | { |
1736 | int i; | |
1737 | struct nlattr *stats; | |
1738 | ||
1739 | struct nla_map { | |
1740 | u32 key; | |
1741 | u32 val; | |
1742 | }; | |
1743 | ||
1744 | struct nla_map map[] = { | |
1745 | {TIPC_NLA_STATS_RX_INFO, s->recv_info}, | |
1746 | {TIPC_NLA_STATS_RX_FRAGMENTS, s->recv_fragments}, | |
1747 | {TIPC_NLA_STATS_RX_FRAGMENTED, s->recv_fragmented}, | |
1748 | {TIPC_NLA_STATS_RX_BUNDLES, s->recv_bundles}, | |
1749 | {TIPC_NLA_STATS_RX_BUNDLED, s->recv_bundled}, | |
1750 | {TIPC_NLA_STATS_TX_INFO, s->sent_info}, | |
1751 | {TIPC_NLA_STATS_TX_FRAGMENTS, s->sent_fragments}, | |
1752 | {TIPC_NLA_STATS_TX_FRAGMENTED, s->sent_fragmented}, | |
1753 | {TIPC_NLA_STATS_TX_BUNDLES, s->sent_bundles}, | |
1754 | {TIPC_NLA_STATS_TX_BUNDLED, s->sent_bundled}, | |
1755 | {TIPC_NLA_STATS_MSG_PROF_TOT, (s->msg_length_counts) ? | |
1756 | s->msg_length_counts : 1}, | |
1757 | {TIPC_NLA_STATS_MSG_LEN_CNT, s->msg_length_counts}, | |
1758 | {TIPC_NLA_STATS_MSG_LEN_TOT, s->msg_lengths_total}, | |
1759 | {TIPC_NLA_STATS_MSG_LEN_P0, s->msg_length_profile[0]}, | |
1760 | {TIPC_NLA_STATS_MSG_LEN_P1, s->msg_length_profile[1]}, | |
1761 | {TIPC_NLA_STATS_MSG_LEN_P2, s->msg_length_profile[2]}, | |
1762 | {TIPC_NLA_STATS_MSG_LEN_P3, s->msg_length_profile[3]}, | |
1763 | {TIPC_NLA_STATS_MSG_LEN_P4, s->msg_length_profile[4]}, | |
1764 | {TIPC_NLA_STATS_MSG_LEN_P5, s->msg_length_profile[5]}, | |
1765 | {TIPC_NLA_STATS_MSG_LEN_P6, s->msg_length_profile[6]}, | |
1766 | {TIPC_NLA_STATS_RX_STATES, s->recv_states}, | |
1767 | {TIPC_NLA_STATS_RX_PROBES, s->recv_probes}, | |
1768 | {TIPC_NLA_STATS_RX_NACKS, s->recv_nacks}, | |
1769 | {TIPC_NLA_STATS_RX_DEFERRED, s->deferred_recv}, | |
1770 | {TIPC_NLA_STATS_TX_STATES, s->sent_states}, | |
1771 | {TIPC_NLA_STATS_TX_PROBES, s->sent_probes}, | |
1772 | {TIPC_NLA_STATS_TX_NACKS, s->sent_nacks}, | |
1773 | {TIPC_NLA_STATS_TX_ACKS, s->sent_acks}, | |
1774 | {TIPC_NLA_STATS_RETRANSMITTED, s->retransmitted}, | |
1775 | {TIPC_NLA_STATS_DUPLICATES, s->duplicates}, | |
1776 | {TIPC_NLA_STATS_LINK_CONGS, s->link_congs}, | |
1777 | {TIPC_NLA_STATS_MAX_QUEUE, s->max_queue_sz}, | |
1778 | {TIPC_NLA_STATS_AVG_QUEUE, s->queue_sz_counts ? | |
1779 | (s->accu_queue_sz / s->queue_sz_counts) : 0} | |
1780 | }; | |
1781 | ||
1782 | stats = nla_nest_start(skb, TIPC_NLA_LINK_STATS); | |
1783 | if (!stats) | |
1784 | return -EMSGSIZE; | |
1785 | ||
1786 | for (i = 0; i < ARRAY_SIZE(map); i++) | |
1787 | if (nla_put_u32(skb, map[i].key, map[i].val)) | |
1788 | goto msg_full; | |
1789 | ||
1790 | nla_nest_end(skb, stats); | |
1791 | ||
1792 | return 0; | |
1793 | msg_full: | |
1794 | nla_nest_cancel(skb, stats); | |
1795 | ||
1796 | return -EMSGSIZE; | |
1797 | } | |
1798 | ||
1799 | /* Caller should hold appropriate locks to protect the link */ | |
5be9c086 JPM |
1800 | int __tipc_nl_add_link(struct net *net, struct tipc_nl_msg *msg, |
1801 | struct tipc_link *link, int nlflags) | |
7be57fc6 RA |
1802 | { |
1803 | int err; | |
1804 | void *hdr; | |
1805 | struct nlattr *attrs; | |
1806 | struct nlattr *prop; | |
34747539 | 1807 | struct tipc_net *tn = net_generic(net, tipc_net_id); |
7be57fc6 | 1808 | |
bfb3e5dd | 1809 | hdr = genlmsg_put(msg->skb, msg->portid, msg->seq, &tipc_genl_family, |
f2f67390 | 1810 | nlflags, TIPC_NL_LINK_GET); |
7be57fc6 RA |
1811 | if (!hdr) |
1812 | return -EMSGSIZE; | |
1813 | ||
1814 | attrs = nla_nest_start(msg->skb, TIPC_NLA_LINK); | |
1815 | if (!attrs) | |
1816 | goto msg_full; | |
1817 | ||
1818 | if (nla_put_string(msg->skb, TIPC_NLA_LINK_NAME, link->name)) | |
1819 | goto attr_msg_full; | |
1820 | if (nla_put_u32(msg->skb, TIPC_NLA_LINK_DEST, | |
34747539 | 1821 | tipc_cluster_mask(tn->own_addr))) |
7be57fc6 | 1822 | goto attr_msg_full; |
ed193ece | 1823 | if (nla_put_u32(msg->skb, TIPC_NLA_LINK_MTU, link->mtu)) |
7be57fc6 | 1824 | goto attr_msg_full; |
a97b9d3f | 1825 | if (nla_put_u32(msg->skb, TIPC_NLA_LINK_RX, link->rcv_nxt)) |
7be57fc6 | 1826 | goto attr_msg_full; |
a97b9d3f | 1827 | if (nla_put_u32(msg->skb, TIPC_NLA_LINK_TX, link->snd_nxt)) |
7be57fc6 RA |
1828 | goto attr_msg_full; |
1829 | ||
1830 | if (tipc_link_is_up(link)) | |
1831 | if (nla_put_flag(msg->skb, TIPC_NLA_LINK_UP)) | |
1832 | goto attr_msg_full; | |
c72fa872 | 1833 | if (link->active) |
7be57fc6 RA |
1834 | if (nla_put_flag(msg->skb, TIPC_NLA_LINK_ACTIVE)) |
1835 | goto attr_msg_full; | |
1836 | ||
1837 | prop = nla_nest_start(msg->skb, TIPC_NLA_LINK_PROP); | |
1838 | if (!prop) | |
1839 | goto attr_msg_full; | |
1840 | if (nla_put_u32(msg->skb, TIPC_NLA_PROP_PRIO, link->priority)) | |
1841 | goto prop_msg_full; | |
1842 | if (nla_put_u32(msg->skb, TIPC_NLA_PROP_TOL, link->tolerance)) | |
1843 | goto prop_msg_full; | |
1844 | if (nla_put_u32(msg->skb, TIPC_NLA_PROP_WIN, | |
1f66d161 | 1845 | link->window)) |
7be57fc6 RA |
1846 | goto prop_msg_full; |
1847 | if (nla_put_u32(msg->skb, TIPC_NLA_PROP_PRIO, link->priority)) | |
1848 | goto prop_msg_full; | |
1849 | nla_nest_end(msg->skb, prop); | |
1850 | ||
1851 | err = __tipc_nl_add_stats(msg->skb, &link->stats); | |
1852 | if (err) | |
1853 | goto attr_msg_full; | |
1854 | ||
1855 | nla_nest_end(msg->skb, attrs); | |
1856 | genlmsg_end(msg->skb, hdr); | |
1857 | ||
1858 | return 0; | |
1859 | ||
1860 | prop_msg_full: | |
1861 | nla_nest_cancel(msg->skb, prop); | |
1862 | attr_msg_full: | |
1863 | nla_nest_cancel(msg->skb, attrs); | |
1864 | msg_full: | |
1865 | genlmsg_cancel(msg->skb, hdr); | |
1866 | ||
1867 | return -EMSGSIZE; | |
1868 | } | |
38206d59 JPM |
1869 | |
1870 | static int __tipc_nl_add_bc_link_stat(struct sk_buff *skb, | |
1871 | struct tipc_stats *stats) | |
1872 | { | |
1873 | int i; | |
1874 | struct nlattr *nest; | |
1875 | ||
1876 | struct nla_map { | |
1877 | __u32 key; | |
1878 | __u32 val; | |
1879 | }; | |
1880 | ||
1881 | struct nla_map map[] = { | |
1882 | {TIPC_NLA_STATS_RX_INFO, stats->recv_info}, | |
1883 | {TIPC_NLA_STATS_RX_FRAGMENTS, stats->recv_fragments}, | |
1884 | {TIPC_NLA_STATS_RX_FRAGMENTED, stats->recv_fragmented}, | |
1885 | {TIPC_NLA_STATS_RX_BUNDLES, stats->recv_bundles}, | |
1886 | {TIPC_NLA_STATS_RX_BUNDLED, stats->recv_bundled}, | |
1887 | {TIPC_NLA_STATS_TX_INFO, stats->sent_info}, | |
1888 | {TIPC_NLA_STATS_TX_FRAGMENTS, stats->sent_fragments}, | |
1889 | {TIPC_NLA_STATS_TX_FRAGMENTED, stats->sent_fragmented}, | |
1890 | {TIPC_NLA_STATS_TX_BUNDLES, stats->sent_bundles}, | |
1891 | {TIPC_NLA_STATS_TX_BUNDLED, stats->sent_bundled}, | |
1892 | {TIPC_NLA_STATS_RX_NACKS, stats->recv_nacks}, | |
1893 | {TIPC_NLA_STATS_RX_DEFERRED, stats->deferred_recv}, | |
1894 | {TIPC_NLA_STATS_TX_NACKS, stats->sent_nacks}, | |
1895 | {TIPC_NLA_STATS_TX_ACKS, stats->sent_acks}, | |
1896 | {TIPC_NLA_STATS_RETRANSMITTED, stats->retransmitted}, | |
1897 | {TIPC_NLA_STATS_DUPLICATES, stats->duplicates}, | |
1898 | {TIPC_NLA_STATS_LINK_CONGS, stats->link_congs}, | |
1899 | {TIPC_NLA_STATS_MAX_QUEUE, stats->max_queue_sz}, | |
1900 | {TIPC_NLA_STATS_AVG_QUEUE, stats->queue_sz_counts ? | |
1901 | (stats->accu_queue_sz / stats->queue_sz_counts) : 0} | |
1902 | }; | |
1903 | ||
1904 | nest = nla_nest_start(skb, TIPC_NLA_LINK_STATS); | |
1905 | if (!nest) | |
1906 | return -EMSGSIZE; | |
1907 | ||
1908 | for (i = 0; i < ARRAY_SIZE(map); i++) | |
1909 | if (nla_put_u32(skb, map[i].key, map[i].val)) | |
1910 | goto msg_full; | |
1911 | ||
1912 | nla_nest_end(skb, nest); | |
1913 | ||
1914 | return 0; | |
1915 | msg_full: | |
1916 | nla_nest_cancel(skb, nest); | |
1917 | ||
1918 | return -EMSGSIZE; | |
1919 | } | |
1920 | ||
1921 | int tipc_nl_add_bc_link(struct net *net, struct tipc_nl_msg *msg) | |
1922 | { | |
1923 | int err; | |
1924 | void *hdr; | |
1925 | struct nlattr *attrs; | |
1926 | struct nlattr *prop; | |
1927 | struct tipc_net *tn = net_generic(net, tipc_net_id); | |
1928 | struct tipc_link *bcl = tn->bcl; | |
1929 | ||
1930 | if (!bcl) | |
1931 | return 0; | |
1932 | ||
1933 | tipc_bcast_lock(net); | |
1934 | ||
1935 | hdr = genlmsg_put(msg->skb, msg->portid, msg->seq, &tipc_genl_family, | |
1936 | NLM_F_MULTI, TIPC_NL_LINK_GET); | |
b53ce3e7 IY |
1937 | if (!hdr) { |
1938 | tipc_bcast_unlock(net); | |
38206d59 | 1939 | return -EMSGSIZE; |
b53ce3e7 | 1940 | } |
38206d59 JPM |
1941 | |
1942 | attrs = nla_nest_start(msg->skb, TIPC_NLA_LINK); | |
1943 | if (!attrs) | |
1944 | goto msg_full; | |
1945 | ||
1946 | /* The broadcast link is always up */ | |
1947 | if (nla_put_flag(msg->skb, TIPC_NLA_LINK_UP)) | |
1948 | goto attr_msg_full; | |
1949 | ||
1950 | if (nla_put_flag(msg->skb, TIPC_NLA_LINK_BROADCAST)) | |
1951 | goto attr_msg_full; | |
1952 | if (nla_put_string(msg->skb, TIPC_NLA_LINK_NAME, bcl->name)) | |
1953 | goto attr_msg_full; | |
1954 | if (nla_put_u32(msg->skb, TIPC_NLA_LINK_RX, bcl->rcv_nxt)) | |
1955 | goto attr_msg_full; | |
1956 | if (nla_put_u32(msg->skb, TIPC_NLA_LINK_TX, bcl->snd_nxt)) | |
1957 | goto attr_msg_full; | |
1958 | ||
1959 | prop = nla_nest_start(msg->skb, TIPC_NLA_LINK_PROP); | |
1960 | if (!prop) | |
1961 | goto attr_msg_full; | |
1962 | if (nla_put_u32(msg->skb, TIPC_NLA_PROP_WIN, bcl->window)) | |
1963 | goto prop_msg_full; | |
1964 | nla_nest_end(msg->skb, prop); | |
1965 | ||
1966 | err = __tipc_nl_add_bc_link_stat(msg->skb, &bcl->stats); | |
1967 | if (err) | |
1968 | goto attr_msg_full; | |
1969 | ||
1970 | tipc_bcast_unlock(net); | |
1971 | nla_nest_end(msg->skb, attrs); | |
1972 | genlmsg_end(msg->skb, hdr); | |
1973 | ||
1974 | return 0; | |
1975 | ||
1976 | prop_msg_full: | |
1977 | nla_nest_cancel(msg->skb, prop); | |
1978 | attr_msg_full: | |
1979 | nla_nest_cancel(msg->skb, attrs); | |
1980 | msg_full: | |
1981 | tipc_bcast_unlock(net); | |
1982 | genlmsg_cancel(msg->skb, hdr); | |
1983 | ||
1984 | return -EMSGSIZE; | |
1985 | } | |
1986 | ||
d01332f1 RA |
1987 | void tipc_link_set_tolerance(struct tipc_link *l, u32 tol, |
1988 | struct sk_buff_head *xmitq) | |
38206d59 JPM |
1989 | { |
1990 | l->tolerance = tol; | |
d01332f1 | 1991 | tipc_link_build_proto_msg(l, STATE_MSG, 0, 0, tol, 0, xmitq); |
38206d59 JPM |
1992 | } |
1993 | ||
d01332f1 RA |
1994 | void tipc_link_set_prio(struct tipc_link *l, u32 prio, |
1995 | struct sk_buff_head *xmitq) | |
38206d59 JPM |
1996 | { |
1997 | l->priority = prio; | |
d01332f1 | 1998 | tipc_link_build_proto_msg(l, STATE_MSG, 0, 0, 0, prio, xmitq); |
38206d59 JPM |
1999 | } |
2000 | ||
2001 | void tipc_link_set_abort_limit(struct tipc_link *l, u32 limit) | |
2002 | { | |
2003 | l->abort_limit = limit; | |
2004 | } |