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 | { | |
707 | int rc = 0; | |
5045f7b9 JPM |
708 | int mtyp = STATE_MSG; |
709 | bool xmit = false; | |
710 | bool prb = false; | |
52666986 JPM |
711 | u16 bc_snt = l->bc_sndlink->snd_nxt - 1; |
712 | u16 bc_acked = l->bc_rcvlink->acked; | |
713 | bool bc_up = link_is_up(l->bc_rcvlink); | |
333ef69e JPM |
714 | |
715 | link_profile_stats(l); | |
5045f7b9 | 716 | |
662921cd JPM |
717 | switch (l->state) { |
718 | case LINK_ESTABLISHED: | |
719 | case LINK_SYNCHING: | |
5045f7b9 | 720 | if (!l->silent_intv_cnt) { |
52666986 | 721 | if (bc_up && (bc_acked != bc_snt)) |
5045f7b9 JPM |
722 | xmit = true; |
723 | } else if (l->silent_intv_cnt <= l->abort_limit) { | |
724 | xmit = true; | |
725 | prb = true; | |
726 | } else { | |
662921cd | 727 | rc |= tipc_link_fsm_evt(l, LINK_FAILURE_EVT); |
5045f7b9 JPM |
728 | } |
729 | l->silent_intv_cnt++; | |
662921cd JPM |
730 | break; |
731 | case LINK_RESET: | |
88e8ac70 JPM |
732 | xmit = l->rst_cnt++ <= 4; |
733 | xmit |= !(l->rst_cnt % 16); | |
5045f7b9 | 734 | mtyp = RESET_MSG; |
662921cd JPM |
735 | break; |
736 | case LINK_ESTABLISHING: | |
5045f7b9 JPM |
737 | xmit = true; |
738 | mtyp = ACTIVATE_MSG; | |
662921cd | 739 | break; |
662921cd | 740 | case LINK_PEER_RESET: |
598411d7 | 741 | case LINK_RESETTING: |
662921cd JPM |
742 | case LINK_FAILINGOVER: |
743 | break; | |
744 | default: | |
745 | break; | |
5045f7b9 | 746 | } |
662921cd | 747 | |
5045f7b9 JPM |
748 | if (xmit) |
749 | tipc_link_build_proto_msg(l, mtyp, prb, 0, 0, 0, xmitq); | |
750 | ||
333ef69e JPM |
751 | return rc; |
752 | } | |
753 | ||
b97bf3fd | 754 | /** |
3127a020 | 755 | * link_schedule_user - schedule a message sender for wakeup after congestion |
50100a5e | 756 | * @link: congested link |
3127a020 | 757 | * @list: message that was attempted sent |
50100a5e | 758 | * Create pseudo msg to send back to user when congestion abates |
22d85c79 | 759 | * Does not consume buffer list |
b97bf3fd | 760 | */ |
3127a020 | 761 | static int link_schedule_user(struct tipc_link *link, struct sk_buff_head *list) |
b97bf3fd | 762 | { |
3127a020 JPM |
763 | struct tipc_msg *msg = buf_msg(skb_peek(list)); |
764 | int imp = msg_importance(msg); | |
765 | u32 oport = msg_origport(msg); | |
e74a386d | 766 | u32 addr = tipc_own_addr(link->net); |
3127a020 JPM |
767 | struct sk_buff *skb; |
768 | ||
769 | /* This really cannot happen... */ | |
770 | if (unlikely(imp > TIPC_CRITICAL_IMPORTANCE)) { | |
771 | pr_warn("%s<%s>, send queue full", link_rst_msg, link->name); | |
22d85c79 | 772 | return -ENOBUFS; |
3127a020 JPM |
773 | } |
774 | /* Non-blocking sender: */ | |
775 | if (TIPC_SKB_CB(skb_peek(list))->wakeup_pending) | |
776 | return -ELINKCONG; | |
777 | ||
778 | /* Create and schedule wakeup pseudo message */ | |
779 | skb = tipc_msg_create(SOCK_WAKEUP, 0, INT_H_SIZE, 0, | |
780 | addr, addr, oport, 0, 0); | |
781 | if (!skb) | |
22d85c79 | 782 | return -ENOBUFS; |
3127a020 JPM |
783 | TIPC_SKB_CB(skb)->chain_sz = skb_queue_len(list); |
784 | TIPC_SKB_CB(skb)->chain_imp = imp; | |
785 | skb_queue_tail(&link->wakeupq, skb); | |
50100a5e | 786 | link->stats.link_congs++; |
3127a020 | 787 | return -ELINKCONG; |
b97bf3fd PL |
788 | } |
789 | ||
50100a5e JPM |
790 | /** |
791 | * link_prepare_wakeup - prepare users for wakeup after congestion | |
792 | * @link: congested link | |
793 | * Move a number of waiting users, as permitted by available space in | |
794 | * the send queue, from link wait queue to node wait queue for wakeup | |
795 | */ | |
1f66d161 | 796 | void link_prepare_wakeup(struct tipc_link *l) |
b97bf3fd | 797 | { |
1f66d161 JPM |
798 | int pnd[TIPC_SYSTEM_IMPORTANCE + 1] = {0,}; |
799 | int imp, lim; | |
58d78b32 | 800 | struct sk_buff *skb, *tmp; |
50100a5e | 801 | |
1f66d161 JPM |
802 | skb_queue_walk_safe(&l->wakeupq, skb, tmp) { |
803 | imp = TIPC_SKB_CB(skb)->chain_imp; | |
804 | lim = l->window + l->backlog[imp].limit; | |
805 | pnd[imp] += TIPC_SKB_CB(skb)->chain_sz; | |
806 | if ((pnd[imp] + l->backlog[imp].len) >= lim) | |
b97bf3fd | 807 | break; |
1f66d161 | 808 | skb_unlink(skb, &l->wakeupq); |
d39bbd44 | 809 | skb_queue_tail(l->inputq, skb); |
b97bf3fd | 810 | } |
b97bf3fd PL |
811 | } |
812 | ||
6e498158 | 813 | void tipc_link_reset(struct tipc_link *l) |
b97bf3fd | 814 | { |
e74a386d JPM |
815 | l->peer_session = ANY_SESSION; |
816 | l->session++; | |
6e498158 | 817 | l->mtu = l->advertised_mtu; |
6e498158 JPM |
818 | __skb_queue_purge(&l->transmq); |
819 | __skb_queue_purge(&l->deferdq); | |
23d8335d | 820 | skb_queue_splice_init(&l->wakeupq, l->inputq); |
2af5ae37 JPM |
821 | __skb_queue_purge(&l->backlogq); |
822 | l->backlog[TIPC_LOW_IMPORTANCE].len = 0; | |
823 | l->backlog[TIPC_MEDIUM_IMPORTANCE].len = 0; | |
824 | l->backlog[TIPC_HIGH_IMPORTANCE].len = 0; | |
825 | l->backlog[TIPC_CRITICAL_IMPORTANCE].len = 0; | |
826 | l->backlog[TIPC_SYSTEM_IMPORTANCE].len = 0; | |
6e498158 JPM |
827 | kfree_skb(l->reasm_buf); |
828 | kfree_skb(l->failover_reasm_skb); | |
829 | l->reasm_buf = NULL; | |
830 | l->failover_reasm_skb = NULL; | |
831 | l->rcv_unacked = 0; | |
832 | l->snd_nxt = 1; | |
833 | l->rcv_nxt = 1; | |
c1ab3f1d | 834 | l->acked = 0; |
6e498158 | 835 | l->silent_intv_cnt = 0; |
88e8ac70 | 836 | l->rst_cnt = 0; |
6e498158 JPM |
837 | l->stats.recv_info = 0; |
838 | l->stale_count = 0; | |
52666986 | 839 | l->bc_peer_is_up = false; |
38206d59 | 840 | tipc_link_reset_stats(l); |
b97bf3fd PL |
841 | } |
842 | ||
af9b028e JPM |
843 | /** |
844 | * tipc_link_xmit(): enqueue buffer list according to queue situation | |
845 | * @link: link to use | |
846 | * @list: chain of buffers containing message | |
847 | * @xmitq: returned list of packets to be sent by caller | |
848 | * | |
849 | * Consumes the buffer chain, except when returning -ELINKCONG, | |
850 | * since the caller then may want to make more send attempts. | |
851 | * Returns 0 if success, or errno: -ELINKCONG, -EMSGSIZE or -ENOBUFS | |
852 | * Messages at TIPC_SYSTEM_IMPORTANCE are always accepted | |
853 | */ | |
854 | int tipc_link_xmit(struct tipc_link *l, struct sk_buff_head *list, | |
855 | struct sk_buff_head *xmitq) | |
856 | { | |
857 | struct tipc_msg *hdr = buf_msg(skb_peek(list)); | |
858 | unsigned int maxwin = l->window; | |
859 | unsigned int i, imp = msg_importance(hdr); | |
860 | unsigned int mtu = l->mtu; | |
861 | u16 ack = l->rcv_nxt - 1; | |
862 | u16 seqno = l->snd_nxt; | |
52666986 | 863 | u16 bc_ack = l->bc_rcvlink->rcv_nxt - 1; |
af9b028e JPM |
864 | struct sk_buff_head *transmq = &l->transmq; |
865 | struct sk_buff_head *backlogq = &l->backlogq; | |
866 | struct sk_buff *skb, *_skb, *bskb; | |
867 | ||
868 | /* Match msg importance against this and all higher backlog limits: */ | |
869 | for (i = imp; i <= TIPC_SYSTEM_IMPORTANCE; i++) { | |
870 | if (unlikely(l->backlog[i].len >= l->backlog[i].limit)) | |
871 | return link_schedule_user(l, list); | |
872 | } | |
4952cd3e RA |
873 | if (unlikely(msg_size(hdr) > mtu)) { |
874 | skb_queue_purge(list); | |
af9b028e | 875 | return -EMSGSIZE; |
4952cd3e | 876 | } |
af9b028e JPM |
877 | |
878 | /* Prepare each packet for sending, and add to relevant queue: */ | |
879 | while (skb_queue_len(list)) { | |
880 | skb = skb_peek(list); | |
881 | hdr = buf_msg(skb); | |
882 | msg_set_seqno(hdr, seqno); | |
883 | msg_set_ack(hdr, ack); | |
52666986 | 884 | msg_set_bcast_ack(hdr, bc_ack); |
af9b028e JPM |
885 | |
886 | if (likely(skb_queue_len(transmq) < maxwin)) { | |
887 | _skb = skb_clone(skb, GFP_ATOMIC); | |
4952cd3e RA |
888 | if (!_skb) { |
889 | skb_queue_purge(list); | |
af9b028e | 890 | return -ENOBUFS; |
4952cd3e | 891 | } |
af9b028e JPM |
892 | __skb_dequeue(list); |
893 | __skb_queue_tail(transmq, skb); | |
894 | __skb_queue_tail(xmitq, _skb); | |
c1ab3f1d | 895 | TIPC_SKB_CB(skb)->ackers = l->ackers; |
af9b028e JPM |
896 | l->rcv_unacked = 0; |
897 | seqno++; | |
898 | continue; | |
899 | } | |
900 | if (tipc_msg_bundle(skb_peek_tail(backlogq), hdr, mtu)) { | |
901 | kfree_skb(__skb_dequeue(list)); | |
902 | l->stats.sent_bundled++; | |
903 | continue; | |
904 | } | |
905 | if (tipc_msg_make_bundle(&bskb, hdr, mtu, l->addr)) { | |
906 | kfree_skb(__skb_dequeue(list)); | |
907 | __skb_queue_tail(backlogq, bskb); | |
908 | l->backlog[msg_importance(buf_msg(bskb))].len++; | |
909 | l->stats.sent_bundled++; | |
910 | l->stats.sent_bundles++; | |
911 | continue; | |
912 | } | |
913 | l->backlog[imp].len += skb_queue_len(list); | |
914 | skb_queue_splice_tail_init(list, backlogq); | |
915 | } | |
916 | l->snd_nxt = seqno; | |
917 | return 0; | |
918 | } | |
919 | ||
d999297c JPM |
920 | void tipc_link_advance_backlog(struct tipc_link *l, struct sk_buff_head *xmitq) |
921 | { | |
922 | struct sk_buff *skb, *_skb; | |
923 | struct tipc_msg *hdr; | |
924 | u16 seqno = l->snd_nxt; | |
925 | u16 ack = l->rcv_nxt - 1; | |
52666986 | 926 | u16 bc_ack = l->bc_rcvlink->rcv_nxt - 1; |
d999297c JPM |
927 | |
928 | while (skb_queue_len(&l->transmq) < l->window) { | |
929 | skb = skb_peek(&l->backlogq); | |
930 | if (!skb) | |
931 | break; | |
932 | _skb = skb_clone(skb, GFP_ATOMIC); | |
933 | if (!_skb) | |
934 | break; | |
935 | __skb_dequeue(&l->backlogq); | |
936 | hdr = buf_msg(skb); | |
937 | l->backlog[msg_importance(hdr)].len--; | |
938 | __skb_queue_tail(&l->transmq, skb); | |
939 | __skb_queue_tail(xmitq, _skb); | |
c1ab3f1d | 940 | TIPC_SKB_CB(skb)->ackers = l->ackers; |
d999297c | 941 | msg_set_seqno(hdr, seqno); |
52666986 JPM |
942 | msg_set_ack(hdr, ack); |
943 | msg_set_bcast_ack(hdr, bc_ack); | |
d999297c JPM |
944 | l->rcv_unacked = 0; |
945 | seqno++; | |
946 | } | |
947 | l->snd_nxt = seqno; | |
948 | } | |
949 | ||
52666986 | 950 | static void link_retransmit_failure(struct tipc_link *l, struct sk_buff *skb) |
d356eeba | 951 | { |
52666986 JPM |
952 | struct tipc_msg *hdr = buf_msg(skb); |
953 | ||
954 | pr_warn("Retransmission failure on link <%s>\n", l->name); | |
955 | link_print(l, "Resetting link "); | |
956 | pr_info("Failed msg: usr %u, typ %u, len %u, err %u\n", | |
957 | msg_user(hdr), msg_type(hdr), msg_size(hdr), msg_errcode(hdr)); | |
958 | pr_info("sqno %u, prev: %x, src: %x\n", | |
959 | msg_seqno(hdr), msg_prevnode(hdr), msg_orignode(hdr)); | |
d356eeba AS |
960 | } |
961 | ||
c1ab3f1d JPM |
962 | int tipc_link_retrans(struct tipc_link *l, u16 from, u16 to, |
963 | struct sk_buff_head *xmitq) | |
d999297c JPM |
964 | { |
965 | struct sk_buff *_skb, *skb = skb_peek(&l->transmq); | |
966 | struct tipc_msg *hdr; | |
c1ab3f1d | 967 | u16 ack = l->rcv_nxt - 1; |
52666986 | 968 | u16 bc_ack = l->bc_rcvlink->rcv_nxt - 1; |
d999297c JPM |
969 | |
970 | if (!skb) | |
971 | return 0; | |
972 | ||
973 | /* Detect repeated retransmit failures on same packet */ | |
974 | if (likely(l->last_retransm != buf_seqno(skb))) { | |
975 | l->last_retransm = buf_seqno(skb); | |
976 | l->stale_count = 1; | |
977 | } else if (++l->stale_count > 100) { | |
978 | link_retransmit_failure(l, skb); | |
662921cd | 979 | return tipc_link_fsm_evt(l, LINK_FAILURE_EVT); |
d999297c | 980 | } |
c1ab3f1d JPM |
981 | |
982 | /* Move forward to where retransmission should start */ | |
d999297c | 983 | skb_queue_walk(&l->transmq, skb) { |
c1ab3f1d JPM |
984 | if (!less(buf_seqno(skb), from)) |
985 | break; | |
986 | } | |
987 | ||
988 | skb_queue_walk_from(&l->transmq, skb) { | |
989 | if (more(buf_seqno(skb), to)) | |
990 | break; | |
d999297c JPM |
991 | hdr = buf_msg(skb); |
992 | _skb = __pskb_copy(skb, MIN_H_SIZE, GFP_ATOMIC); | |
993 | if (!_skb) | |
994 | return 0; | |
995 | hdr = buf_msg(_skb); | |
c1ab3f1d JPM |
996 | msg_set_ack(hdr, ack); |
997 | msg_set_bcast_ack(hdr, bc_ack); | |
d999297c JPM |
998 | _skb->priority = TC_PRIO_CONTROL; |
999 | __skb_queue_tail(xmitq, _skb); | |
d999297c JPM |
1000 | l->stats.retransmitted++; |
1001 | } | |
1002 | return 0; | |
1003 | } | |
1004 | ||
c637c103 | 1005 | /* tipc_data_input - deliver data and name distr msgs to upper layer |
7ae934be | 1006 | * |
c637c103 | 1007 | * Consumes buffer if message is of right type |
7ae934be EH |
1008 | * Node lock must be held |
1009 | */ | |
52666986 | 1010 | static bool tipc_data_input(struct tipc_link *l, struct sk_buff *skb, |
9073fb8b | 1011 | struct sk_buff_head *inputq) |
7ae934be | 1012 | { |
9073fb8b | 1013 | switch (msg_user(buf_msg(skb))) { |
c637c103 JPM |
1014 | case TIPC_LOW_IMPORTANCE: |
1015 | case TIPC_MEDIUM_IMPORTANCE: | |
1016 | case TIPC_HIGH_IMPORTANCE: | |
1017 | case TIPC_CRITICAL_IMPORTANCE: | |
1018 | case CONN_MANAGER: | |
9945e804 | 1019 | skb_queue_tail(inputq, skb); |
c637c103 | 1020 | return true; |
7ae934be | 1021 | case NAME_DISTRIBUTOR: |
52666986 JPM |
1022 | l->bc_rcvlink->state = LINK_ESTABLISHED; |
1023 | skb_queue_tail(l->namedq, skb); | |
c637c103 JPM |
1024 | return true; |
1025 | case MSG_BUNDLER: | |
dff29b1a | 1026 | case TUNNEL_PROTOCOL: |
c637c103 | 1027 | case MSG_FRAGMENTER: |
7ae934be | 1028 | case BCAST_PROTOCOL: |
c637c103 | 1029 | return false; |
7ae934be | 1030 | default: |
c637c103 JPM |
1031 | pr_warn("Dropping received illegal msg type\n"); |
1032 | kfree_skb(skb); | |
1033 | return false; | |
1034 | }; | |
7ae934be | 1035 | } |
c637c103 JPM |
1036 | |
1037 | /* tipc_link_input - process packet that has passed link protocol check | |
1038 | * | |
1039 | * Consumes buffer | |
7ae934be | 1040 | */ |
9073fb8b JPM |
1041 | static int tipc_link_input(struct tipc_link *l, struct sk_buff *skb, |
1042 | struct sk_buff_head *inputq) | |
7ae934be | 1043 | { |
6e498158 JPM |
1044 | struct tipc_msg *hdr = buf_msg(skb); |
1045 | struct sk_buff **reasm_skb = &l->reasm_buf; | |
c637c103 | 1046 | struct sk_buff *iskb; |
9945e804 | 1047 | struct sk_buff_head tmpq; |
6e498158 | 1048 | int usr = msg_user(hdr); |
6144a996 | 1049 | int rc = 0; |
6e498158 JPM |
1050 | int pos = 0; |
1051 | int ipos = 0; | |
c637c103 | 1052 | |
6e498158 JPM |
1053 | if (unlikely(usr == TUNNEL_PROTOCOL)) { |
1054 | if (msg_type(hdr) == SYNCH_MSG) { | |
1055 | __skb_queue_purge(&l->deferdq); | |
1056 | goto drop; | |
8b4ed863 | 1057 | } |
6e498158 JPM |
1058 | if (!tipc_msg_extract(skb, &iskb, &ipos)) |
1059 | return rc; | |
1060 | kfree_skb(skb); | |
1061 | skb = iskb; | |
1062 | hdr = buf_msg(skb); | |
1063 | if (less(msg_seqno(hdr), l->drop_point)) | |
1064 | goto drop; | |
9073fb8b | 1065 | if (tipc_data_input(l, skb, inputq)) |
6e498158 JPM |
1066 | return rc; |
1067 | usr = msg_user(hdr); | |
1068 | reasm_skb = &l->failover_reasm_skb; | |
1069 | } | |
c637c103 | 1070 | |
6e498158 | 1071 | if (usr == MSG_BUNDLER) { |
9945e804 | 1072 | skb_queue_head_init(&tmpq); |
6e498158 JPM |
1073 | l->stats.recv_bundles++; |
1074 | l->stats.recv_bundled += msg_msgcnt(hdr); | |
c637c103 | 1075 | while (tipc_msg_extract(skb, &iskb, &pos)) |
9945e804 JPM |
1076 | tipc_data_input(l, iskb, &tmpq); |
1077 | tipc_skb_queue_splice_tail(&tmpq, inputq); | |
662921cd | 1078 | return 0; |
6e498158 JPM |
1079 | } else if (usr == MSG_FRAGMENTER) { |
1080 | l->stats.recv_fragments++; | |
1081 | if (tipc_buf_append(reasm_skb, &skb)) { | |
1082 | l->stats.recv_fragmented++; | |
9073fb8b | 1083 | tipc_data_input(l, skb, inputq); |
52666986 JPM |
1084 | } else if (!*reasm_skb && !link_is_bc_rcvlink(l)) { |
1085 | pr_warn_ratelimited("Unable to build fragment list\n"); | |
662921cd | 1086 | return tipc_link_fsm_evt(l, LINK_FAILURE_EVT); |
c637c103 | 1087 | } |
662921cd | 1088 | return 0; |
6e498158 | 1089 | } else if (usr == BCAST_PROTOCOL) { |
c72fa872 | 1090 | tipc_bcast_lock(l->net); |
52666986 | 1091 | tipc_link_bc_init_rcv(l->bc_rcvlink, hdr); |
c72fa872 | 1092 | tipc_bcast_unlock(l->net); |
6e498158 JPM |
1093 | } |
1094 | drop: | |
1095 | kfree_skb(skb); | |
662921cd | 1096 | return 0; |
7ae934be EH |
1097 | } |
1098 | ||
d999297c JPM |
1099 | static bool tipc_link_release_pkts(struct tipc_link *l, u16 acked) |
1100 | { | |
1101 | bool released = false; | |
1102 | struct sk_buff *skb, *tmp; | |
1103 | ||
1104 | skb_queue_walk_safe(&l->transmq, skb, tmp) { | |
1105 | if (more(buf_seqno(skb), acked)) | |
1106 | break; | |
1107 | __skb_unlink(skb, &l->transmq); | |
1108 | kfree_skb(skb); | |
1109 | released = true; | |
1110 | } | |
1111 | return released; | |
1112 | } | |
1113 | ||
f9aa358a | 1114 | /* tipc_link_build_ack_msg: prepare link acknowledge message for transmission |
52666986 JPM |
1115 | * |
1116 | * Note that sending of broadcast ack is coordinated among nodes, to reduce | |
1117 | * risk of ack storms towards the sender | |
f9aa358a | 1118 | */ |
52666986 | 1119 | int tipc_link_build_ack_msg(struct tipc_link *l, struct sk_buff_head *xmitq) |
f9aa358a | 1120 | { |
52666986 JPM |
1121 | if (!l) |
1122 | return 0; | |
1123 | ||
1124 | /* Broadcast ACK must be sent via a unicast link => defer to caller */ | |
1125 | if (link_is_bc_rcvlink(l)) { | |
e74a386d | 1126 | if (((l->rcv_nxt ^ tipc_own_addr(l->net)) & 0xf) != 0xf) |
52666986 JPM |
1127 | return 0; |
1128 | l->rcv_unacked = 0; | |
1129 | return TIPC_LINK_SND_BC_ACK; | |
1130 | } | |
1131 | ||
1132 | /* Unicast ACK */ | |
f9aa358a JPM |
1133 | l->rcv_unacked = 0; |
1134 | l->stats.sent_acks++; | |
1135 | tipc_link_build_proto_msg(l, STATE_MSG, 0, 0, 0, 0, xmitq); | |
52666986 | 1136 | return 0; |
f9aa358a JPM |
1137 | } |
1138 | ||
282b3a05 JPM |
1139 | /* tipc_link_build_reset_msg: prepare link RESET or ACTIVATE message |
1140 | */ | |
1141 | void tipc_link_build_reset_msg(struct tipc_link *l, struct sk_buff_head *xmitq) | |
1142 | { | |
1143 | int mtyp = RESET_MSG; | |
634696b1 | 1144 | struct sk_buff *skb; |
282b3a05 JPM |
1145 | |
1146 | if (l->state == LINK_ESTABLISHING) | |
1147 | mtyp = ACTIVATE_MSG; | |
1148 | ||
1149 | tipc_link_build_proto_msg(l, mtyp, 0, 0, 0, 0, xmitq); | |
634696b1 JPM |
1150 | |
1151 | /* Inform peer that this endpoint is going down if applicable */ | |
1152 | skb = skb_peek_tail(xmitq); | |
1153 | if (skb && (l->state == LINK_RESET)) | |
1154 | msg_set_peer_stopping(buf_msg(skb), 1); | |
282b3a05 JPM |
1155 | } |
1156 | ||
f9aa358a JPM |
1157 | /* tipc_link_build_nack_msg: prepare link nack message for transmission |
1158 | */ | |
1159 | static void tipc_link_build_nack_msg(struct tipc_link *l, | |
1160 | struct sk_buff_head *xmitq) | |
1161 | { | |
1162 | u32 def_cnt = ++l->stats.deferred_recv; | |
1163 | ||
52666986 JPM |
1164 | if (link_is_bc_rcvlink(l)) |
1165 | return; | |
1166 | ||
f9aa358a JPM |
1167 | if ((skb_queue_len(&l->deferdq) == 1) || !(def_cnt % TIPC_NACK_INTV)) |
1168 | tipc_link_build_proto_msg(l, STATE_MSG, 0, 0, 0, 0, xmitq); | |
1169 | } | |
1170 | ||
d999297c | 1171 | /* tipc_link_rcv - process TIPC packets/messages arriving from off-node |
f9aa358a | 1172 | * @l: the link that should handle the message |
d999297c JPM |
1173 | * @skb: TIPC packet |
1174 | * @xmitq: queue to place packets to be sent after this call | |
1175 | */ | |
1176 | int tipc_link_rcv(struct tipc_link *l, struct sk_buff *skb, | |
1177 | struct sk_buff_head *xmitq) | |
1178 | { | |
f9aa358a | 1179 | struct sk_buff_head *defq = &l->deferdq; |
d999297c | 1180 | struct tipc_msg *hdr; |
81204c49 | 1181 | u16 seqno, rcv_nxt, win_lim; |
d999297c JPM |
1182 | int rc = 0; |
1183 | ||
f9aa358a | 1184 | do { |
d999297c | 1185 | hdr = buf_msg(skb); |
f9aa358a JPM |
1186 | seqno = msg_seqno(hdr); |
1187 | rcv_nxt = l->rcv_nxt; | |
81204c49 | 1188 | win_lim = rcv_nxt + TIPC_MAX_LINK_WIN; |
d999297c JPM |
1189 | |
1190 | /* Verify and update link state */ | |
f9aa358a JPM |
1191 | if (unlikely(msg_user(hdr) == LINK_PROTOCOL)) |
1192 | return tipc_link_proto_rcv(l, skb, xmitq); | |
d999297c | 1193 | |
662921cd | 1194 | if (unlikely(!link_is_up(l))) { |
73f646ce JPM |
1195 | if (l->state == LINK_ESTABLISHING) |
1196 | rc = TIPC_LINK_UP_EVT; | |
1197 | goto drop; | |
d999297c JPM |
1198 | } |
1199 | ||
f9aa358a | 1200 | /* Don't send probe at next timeout expiration */ |
d999297c JPM |
1201 | l->silent_intv_cnt = 0; |
1202 | ||
81204c49 JPM |
1203 | /* Drop if outside receive window */ |
1204 | if (unlikely(less(seqno, rcv_nxt) || more(seqno, win_lim))) { | |
1205 | l->stats.duplicates++; | |
1206 | goto drop; | |
1207 | } | |
1208 | ||
d999297c JPM |
1209 | /* Forward queues and wake up waiting users */ |
1210 | if (likely(tipc_link_release_pkts(l, msg_ack(hdr)))) { | |
1211 | tipc_link_advance_backlog(l, xmitq); | |
1212 | if (unlikely(!skb_queue_empty(&l->wakeupq))) | |
1213 | link_prepare_wakeup(l); | |
1214 | } | |
1215 | ||
81204c49 JPM |
1216 | /* Defer delivery if sequence gap */ |
1217 | if (unlikely(seqno != rcv_nxt)) { | |
8306f99a | 1218 | __tipc_skb_queue_sorted(defq, seqno, skb); |
f9aa358a JPM |
1219 | tipc_link_build_nack_msg(l, xmitq); |
1220 | break; | |
d999297c JPM |
1221 | } |
1222 | ||
81204c49 | 1223 | /* Deliver packet */ |
d999297c JPM |
1224 | l->rcv_nxt++; |
1225 | l->stats.recv_info++; | |
f9aa358a | 1226 | if (!tipc_data_input(l, skb, l->inputq)) |
52666986 | 1227 | rc |= tipc_link_input(l, skb, l->inputq); |
f9aa358a | 1228 | if (unlikely(++l->rcv_unacked >= TIPC_MIN_LINK_WIN)) |
52666986 JPM |
1229 | rc |= tipc_link_build_ack_msg(l, xmitq); |
1230 | if (unlikely(rc & ~TIPC_LINK_SND_BC_ACK)) | |
1231 | break; | |
f9aa358a JPM |
1232 | } while ((skb = __skb_dequeue(defq))); |
1233 | ||
1234 | return rc; | |
1235 | drop: | |
1236 | kfree_skb(skb); | |
d999297c JPM |
1237 | return rc; |
1238 | } | |
1239 | ||
426cc2b8 JPM |
1240 | static void tipc_link_build_proto_msg(struct tipc_link *l, int mtyp, bool probe, |
1241 | u16 rcvgap, int tolerance, int priority, | |
1242 | struct sk_buff_head *xmitq) | |
1243 | { | |
e74a386d JPM |
1244 | struct sk_buff *skb; |
1245 | struct tipc_msg *hdr; | |
1246 | struct sk_buff_head *dfq = &l->deferdq; | |
52666986 | 1247 | bool node_up = link_is_up(l->bc_rcvlink); |
426cc2b8 JPM |
1248 | |
1249 | /* Don't send protocol message during reset or link failover */ | |
662921cd | 1250 | if (tipc_link_is_blocked(l)) |
426cc2b8 JPM |
1251 | return; |
1252 | ||
e74a386d JPM |
1253 | if (!tipc_link_is_up(l) && (mtyp == STATE_MSG)) |
1254 | return; | |
1255 | ||
1256 | if (!skb_queue_empty(dfq)) | |
1257 | rcvgap = buf_seqno(skb_peek(dfq)) - l->rcv_nxt; | |
1258 | ||
1259 | skb = tipc_msg_create(LINK_PROTOCOL, mtyp, INT_H_SIZE, | |
1260 | TIPC_MAX_IF_NAME, l->addr, | |
1261 | tipc_own_addr(l->net), 0, 0, 0); | |
1262 | if (!skb) | |
1263 | return; | |
1264 | ||
1265 | hdr = buf_msg(skb); | |
1266 | msg_set_session(hdr, l->session); | |
1267 | msg_set_bearer_id(hdr, l->bearer_id); | |
426cc2b8 | 1268 | msg_set_net_plane(hdr, l->net_plane); |
52666986 JPM |
1269 | msg_set_next_sent(hdr, l->snd_nxt); |
1270 | msg_set_ack(hdr, l->rcv_nxt - 1); | |
1271 | msg_set_bcast_ack(hdr, l->bc_rcvlink->rcv_nxt - 1); | |
1272 | msg_set_last_bcast(hdr, l->bc_sndlink->snd_nxt - 1); | |
426cc2b8 JPM |
1273 | msg_set_link_tolerance(hdr, tolerance); |
1274 | msg_set_linkprio(hdr, priority); | |
1275 | msg_set_redundant_link(hdr, node_up); | |
1276 | msg_set_seq_gap(hdr, 0); | |
52666986 | 1277 | msg_set_seqno(hdr, l->snd_nxt + U16_MAX / 2); |
426cc2b8 JPM |
1278 | |
1279 | if (mtyp == STATE_MSG) { | |
e74a386d JPM |
1280 | msg_set_seq_gap(hdr, rcvgap); |
1281 | msg_set_size(hdr, INT_H_SIZE); | |
426cc2b8 | 1282 | msg_set_probe(hdr, probe); |
426cc2b8 | 1283 | l->stats.sent_states++; |
52666986 | 1284 | l->rcv_unacked = 0; |
426cc2b8 JPM |
1285 | } else { |
1286 | /* RESET_MSG or ACTIVATE_MSG */ | |
1287 | msg_set_max_pkt(hdr, l->advertised_mtu); | |
e74a386d | 1288 | strcpy(msg_data(hdr), l->if_name); |
426cc2b8 | 1289 | } |
e74a386d JPM |
1290 | if (probe) |
1291 | l->stats.sent_probes++; | |
1292 | if (rcvgap) | |
1293 | l->stats.sent_nacks++; | |
426cc2b8 | 1294 | skb->priority = TC_PRIO_CONTROL; |
6e498158 | 1295 | __skb_queue_tail(xmitq, skb); |
b97bf3fd PL |
1296 | } |
1297 | ||
6e498158 | 1298 | /* tipc_link_tnl_prepare(): prepare and return a list of tunnel packets |
f9aa358a | 1299 | * with contents of the link's transmit and backlog queues. |
b97bf3fd | 1300 | */ |
6e498158 JPM |
1301 | void tipc_link_tnl_prepare(struct tipc_link *l, struct tipc_link *tnl, |
1302 | int mtyp, struct sk_buff_head *xmitq) | |
b97bf3fd | 1303 | { |
6e498158 JPM |
1304 | struct sk_buff *skb, *tnlskb; |
1305 | struct tipc_msg *hdr, tnlhdr; | |
1306 | struct sk_buff_head *queue = &l->transmq; | |
1307 | struct sk_buff_head tmpxq, tnlq; | |
1308 | u16 pktlen, pktcnt, seqno = l->snd_nxt; | |
b97bf3fd | 1309 | |
6e498158 | 1310 | if (!tnl) |
b97bf3fd PL |
1311 | return; |
1312 | ||
6e498158 JPM |
1313 | skb_queue_head_init(&tnlq); |
1314 | skb_queue_head_init(&tmpxq); | |
dd3f9e70 | 1315 | |
6e498158 JPM |
1316 | /* At least one packet required for safe algorithm => add dummy */ |
1317 | skb = tipc_msg_create(TIPC_LOW_IMPORTANCE, TIPC_DIRECT_MSG, | |
e74a386d | 1318 | BASIC_H_SIZE, 0, l->addr, tipc_own_addr(l->net), |
6e498158 JPM |
1319 | 0, 0, TIPC_ERR_NO_PORT); |
1320 | if (!skb) { | |
1321 | pr_warn("%sunable to create tunnel packet\n", link_co_err); | |
b97bf3fd PL |
1322 | return; |
1323 | } | |
6e498158 JPM |
1324 | skb_queue_tail(&tnlq, skb); |
1325 | tipc_link_xmit(l, &tnlq, &tmpxq); | |
1326 | __skb_queue_purge(&tmpxq); | |
1327 | ||
1328 | /* Initialize reusable tunnel packet header */ | |
e74a386d | 1329 | tipc_msg_init(tipc_own_addr(l->net), &tnlhdr, TUNNEL_PROTOCOL, |
6e498158 JPM |
1330 | mtyp, INT_H_SIZE, l->addr); |
1331 | pktcnt = skb_queue_len(&l->transmq) + skb_queue_len(&l->backlogq); | |
1332 | msg_set_msgcnt(&tnlhdr, pktcnt); | |
1333 | msg_set_bearer_id(&tnlhdr, l->peer_bearer_id); | |
1334 | tnl: | |
1335 | /* Wrap each packet into a tunnel packet */ | |
05dcc5aa | 1336 | skb_queue_walk(queue, skb) { |
6e498158 JPM |
1337 | hdr = buf_msg(skb); |
1338 | if (queue == &l->backlogq) | |
1339 | msg_set_seqno(hdr, seqno++); | |
1340 | pktlen = msg_size(hdr); | |
1341 | msg_set_size(&tnlhdr, pktlen + INT_H_SIZE); | |
1342 | tnlskb = tipc_buf_acquire(pktlen + INT_H_SIZE); | |
1343 | if (!tnlskb) { | |
1344 | pr_warn("%sunable to send packet\n", link_co_err); | |
b97bf3fd PL |
1345 | return; |
1346 | } | |
6e498158 JPM |
1347 | skb_copy_to_linear_data(tnlskb, &tnlhdr, INT_H_SIZE); |
1348 | skb_copy_to_linear_data_offset(tnlskb, INT_H_SIZE, hdr, pktlen); | |
1349 | __skb_queue_tail(&tnlq, tnlskb); | |
b97bf3fd | 1350 | } |
6e498158 JPM |
1351 | if (queue != &l->backlogq) { |
1352 | queue = &l->backlogq; | |
1353 | goto tnl; | |
f006c9c7 | 1354 | } |
1dab3d5a | 1355 | |
6e498158 | 1356 | tipc_link_xmit(tnl, &tnlq, xmitq); |
b97bf3fd | 1357 | |
6e498158 JPM |
1358 | if (mtyp == FAILOVER_MSG) { |
1359 | tnl->drop_point = l->rcv_nxt; | |
1360 | tnl->failover_reasm_skb = l->reasm_buf; | |
1361 | l->reasm_buf = NULL; | |
2da71425 | 1362 | } |
b97bf3fd PL |
1363 | } |
1364 | ||
d999297c JPM |
1365 | /* tipc_link_proto_rcv(): receive link level protocol message : |
1366 | * Note that network plane id propagates through the network, and may | |
1367 | * change at any time. The node with lowest numerical id determines | |
1368 | * network plane | |
1369 | */ | |
1370 | static int tipc_link_proto_rcv(struct tipc_link *l, struct sk_buff *skb, | |
1371 | struct sk_buff_head *xmitq) | |
1372 | { | |
1373 | struct tipc_msg *hdr = buf_msg(skb); | |
1374 | u16 rcvgap = 0; | |
c1ab3f1d JPM |
1375 | u16 ack = msg_ack(hdr); |
1376 | u16 gap = msg_seq_gap(hdr); | |
d999297c JPM |
1377 | u16 peers_snd_nxt = msg_next_sent(hdr); |
1378 | u16 peers_tol = msg_link_tolerance(hdr); | |
1379 | u16 peers_prio = msg_linkprio(hdr); | |
2be80c2d | 1380 | u16 rcv_nxt = l->rcv_nxt; |
73f646ce | 1381 | int mtyp = msg_type(hdr); |
d999297c JPM |
1382 | char *if_name; |
1383 | int rc = 0; | |
1384 | ||
52666986 | 1385 | if (tipc_link_is_blocked(l) || !xmitq) |
d999297c JPM |
1386 | goto exit; |
1387 | ||
e74a386d | 1388 | if (tipc_own_addr(l->net) > msg_prevnode(hdr)) |
d999297c JPM |
1389 | l->net_plane = msg_net_plane(hdr); |
1390 | ||
73f646ce | 1391 | switch (mtyp) { |
d999297c JPM |
1392 | case RESET_MSG: |
1393 | ||
1394 | /* Ignore duplicate RESET with old session number */ | |
1395 | if ((less_eq(msg_session(hdr), l->peer_session)) && | |
e74a386d | 1396 | (l->peer_session != ANY_SESSION)) |
d999297c JPM |
1397 | break; |
1398 | /* fall thru' */ | |
662921cd | 1399 | |
d999297c | 1400 | case ACTIVATE_MSG: |
c7cad0d6 JPM |
1401 | skb_linearize(skb); |
1402 | hdr = buf_msg(skb); | |
d999297c JPM |
1403 | |
1404 | /* Complete own link name with peer's interface name */ | |
1405 | if_name = strrchr(l->name, ':') + 1; | |
1406 | if (sizeof(l->name) - (if_name - l->name) <= TIPC_MAX_IF_NAME) | |
1407 | break; | |
1408 | if (msg_data_sz(hdr) < TIPC_MAX_IF_NAME) | |
1409 | break; | |
1410 | strncpy(if_name, msg_data(hdr), TIPC_MAX_IF_NAME); | |
1411 | ||
1412 | /* Update own tolerance if peer indicates a non-zero value */ | |
1413 | if (in_range(peers_tol, TIPC_MIN_LINK_TOL, TIPC_MAX_LINK_TOL)) | |
1414 | l->tolerance = peers_tol; | |
1415 | ||
1416 | /* Update own priority if peer's priority is higher */ | |
1417 | if (in_range(peers_prio, l->priority + 1, TIPC_MAX_LINK_PRI)) | |
1418 | l->priority = peers_prio; | |
1419 | ||
73f646ce | 1420 | /* ACTIVATE_MSG serves as PEER_RESET if link is already down */ |
634696b1 JPM |
1421 | if (msg_peer_stopping(hdr)) |
1422 | rc = tipc_link_fsm_evt(l, LINK_FAILURE_EVT); | |
1423 | else if ((mtyp == RESET_MSG) || !link_is_up(l)) | |
73f646ce JPM |
1424 | rc = tipc_link_fsm_evt(l, LINK_PEER_RESET_EVT); |
1425 | ||
1426 | /* ACTIVATE_MSG takes up link if it was already locally reset */ | |
1427 | if ((mtyp == ACTIVATE_MSG) && (l->state == LINK_ESTABLISHING)) | |
1428 | rc = TIPC_LINK_UP_EVT; | |
1429 | ||
d999297c JPM |
1430 | l->peer_session = msg_session(hdr); |
1431 | l->peer_bearer_id = msg_bearer_id(hdr); | |
d999297c JPM |
1432 | if (l->mtu > msg_max_pkt(hdr)) |
1433 | l->mtu = msg_max_pkt(hdr); | |
1434 | break; | |
662921cd | 1435 | |
d999297c | 1436 | case STATE_MSG: |
662921cd | 1437 | |
d999297c JPM |
1438 | /* Update own tolerance if peer indicates a non-zero value */ |
1439 | if (in_range(peers_tol, TIPC_MIN_LINK_TOL, TIPC_MAX_LINK_TOL)) | |
1440 | l->tolerance = peers_tol; | |
1441 | ||
81729810 RA |
1442 | if (peers_prio && in_range(peers_prio, TIPC_MIN_LINK_PRI, |
1443 | TIPC_MAX_LINK_PRI)) { | |
1444 | l->priority = peers_prio; | |
1445 | rc = tipc_link_fsm_evt(l, LINK_FAILURE_EVT); | |
1446 | } | |
1447 | ||
d999297c JPM |
1448 | l->silent_intv_cnt = 0; |
1449 | l->stats.recv_states++; | |
1450 | if (msg_probe(hdr)) | |
1451 | l->stats.recv_probes++; | |
73f646ce JPM |
1452 | |
1453 | if (!link_is_up(l)) { | |
1454 | if (l->state == LINK_ESTABLISHING) | |
1455 | rc = TIPC_LINK_UP_EVT; | |
d999297c | 1456 | break; |
73f646ce | 1457 | } |
d999297c | 1458 | |
662921cd | 1459 | /* Send NACK if peer has sent pkts we haven't received yet */ |
2be80c2d | 1460 | if (more(peers_snd_nxt, rcv_nxt) && !tipc_link_is_synching(l)) |
d999297c JPM |
1461 | rcvgap = peers_snd_nxt - l->rcv_nxt; |
1462 | if (rcvgap || (msg_probe(hdr))) | |
1463 | tipc_link_build_proto_msg(l, STATE_MSG, 0, rcvgap, | |
16040894 | 1464 | 0, 0, xmitq); |
c1ab3f1d | 1465 | tipc_link_release_pkts(l, ack); |
d999297c JPM |
1466 | |
1467 | /* If NACK, retransmit will now start at right position */ | |
c1ab3f1d JPM |
1468 | if (gap) { |
1469 | rc = tipc_link_retrans(l, ack + 1, ack + gap, xmitq); | |
d999297c JPM |
1470 | l->stats.recv_nacks++; |
1471 | } | |
662921cd | 1472 | |
d999297c JPM |
1473 | tipc_link_advance_backlog(l, xmitq); |
1474 | if (unlikely(!skb_queue_empty(&l->wakeupq))) | |
1475 | link_prepare_wakeup(l); | |
1476 | } | |
1477 | exit: | |
1478 | kfree_skb(skb); | |
1479 | return rc; | |
1480 | } | |
1481 | ||
52666986 JPM |
1482 | /* tipc_link_build_bc_proto_msg() - create broadcast protocol message |
1483 | */ | |
1484 | static bool tipc_link_build_bc_proto_msg(struct tipc_link *l, bool bcast, | |
1485 | u16 peers_snd_nxt, | |
1486 | struct sk_buff_head *xmitq) | |
1487 | { | |
1488 | struct sk_buff *skb; | |
1489 | struct tipc_msg *hdr; | |
1490 | struct sk_buff *dfrd_skb = skb_peek(&l->deferdq); | |
1491 | u16 ack = l->rcv_nxt - 1; | |
1492 | u16 gap_to = peers_snd_nxt - 1; | |
1493 | ||
1494 | skb = tipc_msg_create(BCAST_PROTOCOL, STATE_MSG, INT_H_SIZE, | |
e74a386d | 1495 | 0, l->addr, tipc_own_addr(l->net), 0, 0, 0); |
52666986 JPM |
1496 | if (!skb) |
1497 | return false; | |
1498 | hdr = buf_msg(skb); | |
1499 | msg_set_last_bcast(hdr, l->bc_sndlink->snd_nxt - 1); | |
1500 | msg_set_bcast_ack(hdr, ack); | |
1501 | msg_set_bcgap_after(hdr, ack); | |
1502 | if (dfrd_skb) | |
1503 | gap_to = buf_seqno(dfrd_skb) - 1; | |
1504 | msg_set_bcgap_to(hdr, gap_to); | |
1505 | msg_set_non_seq(hdr, bcast); | |
1506 | __skb_queue_tail(xmitq, skb); | |
1507 | return true; | |
1508 | } | |
1509 | ||
1510 | /* tipc_link_build_bc_init_msg() - synchronize broadcast link endpoints. | |
1511 | * | |
1512 | * Give a newly added peer node the sequence number where it should | |
1513 | * start receiving and acking broadcast packets. | |
1514 | */ | |
742e0383 WF |
1515 | static void tipc_link_build_bc_init_msg(struct tipc_link *l, |
1516 | struct sk_buff_head *xmitq) | |
52666986 JPM |
1517 | { |
1518 | struct sk_buff_head list; | |
1519 | ||
1520 | __skb_queue_head_init(&list); | |
1521 | if (!tipc_link_build_bc_proto_msg(l->bc_rcvlink, false, 0, &list)) | |
1522 | return; | |
1523 | tipc_link_xmit(l, &list, xmitq); | |
1524 | } | |
1525 | ||
1526 | /* tipc_link_bc_init_rcv - receive initial broadcast synch data from peer | |
1527 | */ | |
1528 | void tipc_link_bc_init_rcv(struct tipc_link *l, struct tipc_msg *hdr) | |
1529 | { | |
1530 | int mtyp = msg_type(hdr); | |
1531 | u16 peers_snd_nxt = msg_bc_snd_nxt(hdr); | |
1532 | ||
1533 | if (link_is_up(l)) | |
1534 | return; | |
1535 | ||
1536 | if (msg_user(hdr) == BCAST_PROTOCOL) { | |
1537 | l->rcv_nxt = peers_snd_nxt; | |
1538 | l->state = LINK_ESTABLISHED; | |
1539 | return; | |
1540 | } | |
1541 | ||
1542 | if (l->peer_caps & TIPC_BCAST_SYNCH) | |
1543 | return; | |
1544 | ||
1545 | if (msg_peer_node_is_up(hdr)) | |
1546 | return; | |
1547 | ||
1548 | /* Compatibility: accept older, less safe initial synch data */ | |
1549 | if ((mtyp == RESET_MSG) || (mtyp == ACTIVATE_MSG)) | |
1550 | l->rcv_nxt = peers_snd_nxt; | |
1551 | } | |
1552 | ||
1553 | /* tipc_link_bc_sync_rcv - update rcv link according to peer's send state | |
1554 | */ | |
1555 | void tipc_link_bc_sync_rcv(struct tipc_link *l, struct tipc_msg *hdr, | |
1556 | struct sk_buff_head *xmitq) | |
1557 | { | |
1558 | u16 peers_snd_nxt = msg_bc_snd_nxt(hdr); | |
1559 | ||
1560 | if (!link_is_up(l)) | |
1561 | return; | |
1562 | ||
1563 | if (!msg_peer_node_is_up(hdr)) | |
1564 | return; | |
1565 | ||
1566 | l->bc_peer_is_up = true; | |
1567 | ||
1568 | /* Ignore if peers_snd_nxt goes beyond receive window */ | |
1569 | if (more(peers_snd_nxt, l->rcv_nxt + l->window)) | |
1570 | return; | |
1571 | ||
1572 | if (!more(peers_snd_nxt, l->rcv_nxt)) { | |
1573 | l->nack_state = BC_NACK_SND_CONDITIONAL; | |
1574 | return; | |
1575 | } | |
1576 | ||
1577 | /* Don't NACK if one was recently sent or peeked */ | |
1578 | if (l->nack_state == BC_NACK_SND_SUPPRESS) { | |
1579 | l->nack_state = BC_NACK_SND_UNCONDITIONAL; | |
1580 | return; | |
1581 | } | |
1582 | ||
1583 | /* Conditionally delay NACK sending until next synch rcv */ | |
1584 | if (l->nack_state == BC_NACK_SND_CONDITIONAL) { | |
1585 | l->nack_state = BC_NACK_SND_UNCONDITIONAL; | |
1586 | if ((peers_snd_nxt - l->rcv_nxt) < TIPC_MIN_LINK_WIN) | |
1587 | return; | |
1588 | } | |
1589 | ||
1590 | /* Send NACK now but suppress next one */ | |
1591 | tipc_link_build_bc_proto_msg(l, true, peers_snd_nxt, xmitq); | |
1592 | l->nack_state = BC_NACK_SND_SUPPRESS; | |
1593 | } | |
1594 | ||
1595 | void tipc_link_bc_ack_rcv(struct tipc_link *l, u16 acked, | |
1596 | struct sk_buff_head *xmitq) | |
1597 | { | |
1598 | struct sk_buff *skb, *tmp; | |
1599 | struct tipc_link *snd_l = l->bc_sndlink; | |
1600 | ||
1601 | if (!link_is_up(l) || !l->bc_peer_is_up) | |
1602 | return; | |
1603 | ||
1604 | if (!more(acked, l->acked)) | |
1605 | return; | |
1606 | ||
1607 | /* Skip over packets peer has already acked */ | |
1608 | skb_queue_walk(&snd_l->transmq, skb) { | |
1609 | if (more(buf_seqno(skb), l->acked)) | |
1610 | break; | |
1611 | } | |
1612 | ||
1613 | /* Update/release the packets peer is acking now */ | |
1614 | skb_queue_walk_from_safe(&snd_l->transmq, skb, tmp) { | |
1615 | if (more(buf_seqno(skb), acked)) | |
1616 | break; | |
1617 | if (!--TIPC_SKB_CB(skb)->ackers) { | |
1618 | __skb_unlink(skb, &snd_l->transmq); | |
1619 | kfree_skb(skb); | |
1620 | } | |
1621 | } | |
1622 | l->acked = acked; | |
1623 | tipc_link_advance_backlog(snd_l, xmitq); | |
1624 | if (unlikely(!skb_queue_empty(&snd_l->wakeupq))) | |
1625 | link_prepare_wakeup(snd_l); | |
1626 | } | |
1627 | ||
1628 | /* tipc_link_bc_nack_rcv(): receive broadcast nack message | |
1629 | */ | |
1630 | int tipc_link_bc_nack_rcv(struct tipc_link *l, struct sk_buff *skb, | |
1631 | struct sk_buff_head *xmitq) | |
1632 | { | |
1633 | struct tipc_msg *hdr = buf_msg(skb); | |
1634 | u32 dnode = msg_destnode(hdr); | |
1635 | int mtyp = msg_type(hdr); | |
1636 | u16 acked = msg_bcast_ack(hdr); | |
1637 | u16 from = acked + 1; | |
1638 | u16 to = msg_bcgap_to(hdr); | |
1639 | u16 peers_snd_nxt = to + 1; | |
1640 | int rc = 0; | |
1641 | ||
1642 | kfree_skb(skb); | |
1643 | ||
1644 | if (!tipc_link_is_up(l) || !l->bc_peer_is_up) | |
1645 | return 0; | |
1646 | ||
1647 | if (mtyp != STATE_MSG) | |
1648 | return 0; | |
1649 | ||
e74a386d | 1650 | if (dnode == tipc_own_addr(l->net)) { |
52666986 JPM |
1651 | tipc_link_bc_ack_rcv(l, acked, xmitq); |
1652 | rc = tipc_link_retrans(l->bc_sndlink, from, to, xmitq); | |
1653 | l->stats.recv_nacks++; | |
1654 | return rc; | |
1655 | } | |
1656 | ||
1657 | /* Msg for other node => suppress own NACK at next sync if applicable */ | |
1658 | if (more(peers_snd_nxt, l->rcv_nxt) && !less(l->rcv_nxt, from)) | |
1659 | l->nack_state = BC_NACK_SND_SUPPRESS; | |
1660 | ||
1661 | return 0; | |
1662 | } | |
1663 | ||
e3eea1eb | 1664 | void tipc_link_set_queue_limits(struct tipc_link *l, u32 win) |
b97bf3fd | 1665 | { |
ed193ece | 1666 | int max_bulk = TIPC_MAX_PUBLICATIONS / (l->mtu / ITEM_SIZE); |
e3eea1eb JPM |
1667 | |
1668 | l->window = win; | |
1f66d161 JPM |
1669 | l->backlog[TIPC_LOW_IMPORTANCE].limit = win / 2; |
1670 | l->backlog[TIPC_MEDIUM_IMPORTANCE].limit = win; | |
1671 | l->backlog[TIPC_HIGH_IMPORTANCE].limit = win / 2 * 3; | |
1672 | l->backlog[TIPC_CRITICAL_IMPORTANCE].limit = win * 2; | |
1673 | l->backlog[TIPC_SYSTEM_IMPORTANCE].limit = max_bulk; | |
b97bf3fd PL |
1674 | } |
1675 | ||
b97bf3fd | 1676 | /** |
38206d59 | 1677 | * link_reset_stats - reset link statistics |
1a90632d | 1678 | * @l: pointer to link |
b97bf3fd | 1679 | */ |
38206d59 | 1680 | void tipc_link_reset_stats(struct tipc_link *l) |
b97bf3fd | 1681 | { |
38206d59 JPM |
1682 | memset(&l->stats, 0, sizeof(l->stats)); |
1683 | if (!link_is_bc_sndlink(l)) { | |
1684 | l->stats.sent_info = l->snd_nxt; | |
1685 | l->stats.recv_info = l->rcv_nxt; | |
1686 | } | |
b97bf3fd PL |
1687 | } |
1688 | ||
1a20cc25 | 1689 | static void link_print(struct tipc_link *l, const char *str) |
b97bf3fd | 1690 | { |
1a20cc25 | 1691 | struct sk_buff *hskb = skb_peek(&l->transmq); |
c1ab3f1d | 1692 | u16 head = hskb ? msg_seqno(buf_msg(hskb)) : l->snd_nxt - 1; |
1a20cc25 | 1693 | u16 tail = l->snd_nxt - 1; |
7a2f7d18 | 1694 | |
662921cd | 1695 | pr_info("%s Link <%s> state %x\n", str, l->name, l->state); |
1a20cc25 JPM |
1696 | pr_info("XMTQ: %u [%u-%u], BKLGQ: %u, SNDNX: %u, RCVNX: %u\n", |
1697 | skb_queue_len(&l->transmq), head, tail, | |
1698 | skb_queue_len(&l->backlogq), l->snd_nxt, l->rcv_nxt); | |
b97bf3fd | 1699 | } |
0655f6a8 RA |
1700 | |
1701 | /* Parse and validate nested (link) properties valid for media, bearer and link | |
1702 | */ | |
1703 | int tipc_nl_parse_link_prop(struct nlattr *prop, struct nlattr *props[]) | |
1704 | { | |
1705 | int err; | |
1706 | ||
1707 | err = nla_parse_nested(props, TIPC_NLA_PROP_MAX, prop, | |
1708 | tipc_nl_prop_policy); | |
1709 | if (err) | |
1710 | return err; | |
1711 | ||
1712 | if (props[TIPC_NLA_PROP_PRIO]) { | |
1713 | u32 prio; | |
1714 | ||
1715 | prio = nla_get_u32(props[TIPC_NLA_PROP_PRIO]); | |
1716 | if (prio > TIPC_MAX_LINK_PRI) | |
1717 | return -EINVAL; | |
1718 | } | |
1719 | ||
1720 | if (props[TIPC_NLA_PROP_TOL]) { | |
1721 | u32 tol; | |
1722 | ||
1723 | tol = nla_get_u32(props[TIPC_NLA_PROP_TOL]); | |
1724 | if ((tol < TIPC_MIN_LINK_TOL) || (tol > TIPC_MAX_LINK_TOL)) | |
1725 | return -EINVAL; | |
1726 | } | |
1727 | ||
1728 | if (props[TIPC_NLA_PROP_WIN]) { | |
1729 | u32 win; | |
1730 | ||
1731 | win = nla_get_u32(props[TIPC_NLA_PROP_WIN]); | |
1732 | if ((win < TIPC_MIN_LINK_WIN) || (win > TIPC_MAX_LINK_WIN)) | |
1733 | return -EINVAL; | |
1734 | } | |
1735 | ||
1736 | return 0; | |
1737 | } | |
7be57fc6 | 1738 | |
d8182804 | 1739 | static int __tipc_nl_add_stats(struct sk_buff *skb, struct tipc_stats *s) |
7be57fc6 RA |
1740 | { |
1741 | int i; | |
1742 | struct nlattr *stats; | |
1743 | ||
1744 | struct nla_map { | |
1745 | u32 key; | |
1746 | u32 val; | |
1747 | }; | |
1748 | ||
1749 | struct nla_map map[] = { | |
1750 | {TIPC_NLA_STATS_RX_INFO, s->recv_info}, | |
1751 | {TIPC_NLA_STATS_RX_FRAGMENTS, s->recv_fragments}, | |
1752 | {TIPC_NLA_STATS_RX_FRAGMENTED, s->recv_fragmented}, | |
1753 | {TIPC_NLA_STATS_RX_BUNDLES, s->recv_bundles}, | |
1754 | {TIPC_NLA_STATS_RX_BUNDLED, s->recv_bundled}, | |
1755 | {TIPC_NLA_STATS_TX_INFO, s->sent_info}, | |
1756 | {TIPC_NLA_STATS_TX_FRAGMENTS, s->sent_fragments}, | |
1757 | {TIPC_NLA_STATS_TX_FRAGMENTED, s->sent_fragmented}, | |
1758 | {TIPC_NLA_STATS_TX_BUNDLES, s->sent_bundles}, | |
1759 | {TIPC_NLA_STATS_TX_BUNDLED, s->sent_bundled}, | |
1760 | {TIPC_NLA_STATS_MSG_PROF_TOT, (s->msg_length_counts) ? | |
1761 | s->msg_length_counts : 1}, | |
1762 | {TIPC_NLA_STATS_MSG_LEN_CNT, s->msg_length_counts}, | |
1763 | {TIPC_NLA_STATS_MSG_LEN_TOT, s->msg_lengths_total}, | |
1764 | {TIPC_NLA_STATS_MSG_LEN_P0, s->msg_length_profile[0]}, | |
1765 | {TIPC_NLA_STATS_MSG_LEN_P1, s->msg_length_profile[1]}, | |
1766 | {TIPC_NLA_STATS_MSG_LEN_P2, s->msg_length_profile[2]}, | |
1767 | {TIPC_NLA_STATS_MSG_LEN_P3, s->msg_length_profile[3]}, | |
1768 | {TIPC_NLA_STATS_MSG_LEN_P4, s->msg_length_profile[4]}, | |
1769 | {TIPC_NLA_STATS_MSG_LEN_P5, s->msg_length_profile[5]}, | |
1770 | {TIPC_NLA_STATS_MSG_LEN_P6, s->msg_length_profile[6]}, | |
1771 | {TIPC_NLA_STATS_RX_STATES, s->recv_states}, | |
1772 | {TIPC_NLA_STATS_RX_PROBES, s->recv_probes}, | |
1773 | {TIPC_NLA_STATS_RX_NACKS, s->recv_nacks}, | |
1774 | {TIPC_NLA_STATS_RX_DEFERRED, s->deferred_recv}, | |
1775 | {TIPC_NLA_STATS_TX_STATES, s->sent_states}, | |
1776 | {TIPC_NLA_STATS_TX_PROBES, s->sent_probes}, | |
1777 | {TIPC_NLA_STATS_TX_NACKS, s->sent_nacks}, | |
1778 | {TIPC_NLA_STATS_TX_ACKS, s->sent_acks}, | |
1779 | {TIPC_NLA_STATS_RETRANSMITTED, s->retransmitted}, | |
1780 | {TIPC_NLA_STATS_DUPLICATES, s->duplicates}, | |
1781 | {TIPC_NLA_STATS_LINK_CONGS, s->link_congs}, | |
1782 | {TIPC_NLA_STATS_MAX_QUEUE, s->max_queue_sz}, | |
1783 | {TIPC_NLA_STATS_AVG_QUEUE, s->queue_sz_counts ? | |
1784 | (s->accu_queue_sz / s->queue_sz_counts) : 0} | |
1785 | }; | |
1786 | ||
1787 | stats = nla_nest_start(skb, TIPC_NLA_LINK_STATS); | |
1788 | if (!stats) | |
1789 | return -EMSGSIZE; | |
1790 | ||
1791 | for (i = 0; i < ARRAY_SIZE(map); i++) | |
1792 | if (nla_put_u32(skb, map[i].key, map[i].val)) | |
1793 | goto msg_full; | |
1794 | ||
1795 | nla_nest_end(skb, stats); | |
1796 | ||
1797 | return 0; | |
1798 | msg_full: | |
1799 | nla_nest_cancel(skb, stats); | |
1800 | ||
1801 | return -EMSGSIZE; | |
1802 | } | |
1803 | ||
1804 | /* Caller should hold appropriate locks to protect the link */ | |
5be9c086 JPM |
1805 | int __tipc_nl_add_link(struct net *net, struct tipc_nl_msg *msg, |
1806 | struct tipc_link *link, int nlflags) | |
7be57fc6 RA |
1807 | { |
1808 | int err; | |
1809 | void *hdr; | |
1810 | struct nlattr *attrs; | |
1811 | struct nlattr *prop; | |
34747539 | 1812 | struct tipc_net *tn = net_generic(net, tipc_net_id); |
7be57fc6 | 1813 | |
bfb3e5dd | 1814 | hdr = genlmsg_put(msg->skb, msg->portid, msg->seq, &tipc_genl_family, |
f2f67390 | 1815 | nlflags, TIPC_NL_LINK_GET); |
7be57fc6 RA |
1816 | if (!hdr) |
1817 | return -EMSGSIZE; | |
1818 | ||
1819 | attrs = nla_nest_start(msg->skb, TIPC_NLA_LINK); | |
1820 | if (!attrs) | |
1821 | goto msg_full; | |
1822 | ||
1823 | if (nla_put_string(msg->skb, TIPC_NLA_LINK_NAME, link->name)) | |
1824 | goto attr_msg_full; | |
1825 | if (nla_put_u32(msg->skb, TIPC_NLA_LINK_DEST, | |
34747539 | 1826 | tipc_cluster_mask(tn->own_addr))) |
7be57fc6 | 1827 | goto attr_msg_full; |
ed193ece | 1828 | if (nla_put_u32(msg->skb, TIPC_NLA_LINK_MTU, link->mtu)) |
7be57fc6 | 1829 | goto attr_msg_full; |
a97b9d3f | 1830 | if (nla_put_u32(msg->skb, TIPC_NLA_LINK_RX, link->rcv_nxt)) |
7be57fc6 | 1831 | goto attr_msg_full; |
a97b9d3f | 1832 | if (nla_put_u32(msg->skb, TIPC_NLA_LINK_TX, link->snd_nxt)) |
7be57fc6 RA |
1833 | goto attr_msg_full; |
1834 | ||
1835 | if (tipc_link_is_up(link)) | |
1836 | if (nla_put_flag(msg->skb, TIPC_NLA_LINK_UP)) | |
1837 | goto attr_msg_full; | |
c72fa872 | 1838 | if (link->active) |
7be57fc6 RA |
1839 | if (nla_put_flag(msg->skb, TIPC_NLA_LINK_ACTIVE)) |
1840 | goto attr_msg_full; | |
1841 | ||
1842 | prop = nla_nest_start(msg->skb, TIPC_NLA_LINK_PROP); | |
1843 | if (!prop) | |
1844 | goto attr_msg_full; | |
1845 | if (nla_put_u32(msg->skb, TIPC_NLA_PROP_PRIO, link->priority)) | |
1846 | goto prop_msg_full; | |
1847 | if (nla_put_u32(msg->skb, TIPC_NLA_PROP_TOL, link->tolerance)) | |
1848 | goto prop_msg_full; | |
1849 | if (nla_put_u32(msg->skb, TIPC_NLA_PROP_WIN, | |
1f66d161 | 1850 | link->window)) |
7be57fc6 RA |
1851 | goto prop_msg_full; |
1852 | if (nla_put_u32(msg->skb, TIPC_NLA_PROP_PRIO, link->priority)) | |
1853 | goto prop_msg_full; | |
1854 | nla_nest_end(msg->skb, prop); | |
1855 | ||
1856 | err = __tipc_nl_add_stats(msg->skb, &link->stats); | |
1857 | if (err) | |
1858 | goto attr_msg_full; | |
1859 | ||
1860 | nla_nest_end(msg->skb, attrs); | |
1861 | genlmsg_end(msg->skb, hdr); | |
1862 | ||
1863 | return 0; | |
1864 | ||
1865 | prop_msg_full: | |
1866 | nla_nest_cancel(msg->skb, prop); | |
1867 | attr_msg_full: | |
1868 | nla_nest_cancel(msg->skb, attrs); | |
1869 | msg_full: | |
1870 | genlmsg_cancel(msg->skb, hdr); | |
1871 | ||
1872 | return -EMSGSIZE; | |
1873 | } | |
38206d59 JPM |
1874 | |
1875 | static int __tipc_nl_add_bc_link_stat(struct sk_buff *skb, | |
1876 | struct tipc_stats *stats) | |
1877 | { | |
1878 | int i; | |
1879 | struct nlattr *nest; | |
1880 | ||
1881 | struct nla_map { | |
1882 | __u32 key; | |
1883 | __u32 val; | |
1884 | }; | |
1885 | ||
1886 | struct nla_map map[] = { | |
1887 | {TIPC_NLA_STATS_RX_INFO, stats->recv_info}, | |
1888 | {TIPC_NLA_STATS_RX_FRAGMENTS, stats->recv_fragments}, | |
1889 | {TIPC_NLA_STATS_RX_FRAGMENTED, stats->recv_fragmented}, | |
1890 | {TIPC_NLA_STATS_RX_BUNDLES, stats->recv_bundles}, | |
1891 | {TIPC_NLA_STATS_RX_BUNDLED, stats->recv_bundled}, | |
1892 | {TIPC_NLA_STATS_TX_INFO, stats->sent_info}, | |
1893 | {TIPC_NLA_STATS_TX_FRAGMENTS, stats->sent_fragments}, | |
1894 | {TIPC_NLA_STATS_TX_FRAGMENTED, stats->sent_fragmented}, | |
1895 | {TIPC_NLA_STATS_TX_BUNDLES, stats->sent_bundles}, | |
1896 | {TIPC_NLA_STATS_TX_BUNDLED, stats->sent_bundled}, | |
1897 | {TIPC_NLA_STATS_RX_NACKS, stats->recv_nacks}, | |
1898 | {TIPC_NLA_STATS_RX_DEFERRED, stats->deferred_recv}, | |
1899 | {TIPC_NLA_STATS_TX_NACKS, stats->sent_nacks}, | |
1900 | {TIPC_NLA_STATS_TX_ACKS, stats->sent_acks}, | |
1901 | {TIPC_NLA_STATS_RETRANSMITTED, stats->retransmitted}, | |
1902 | {TIPC_NLA_STATS_DUPLICATES, stats->duplicates}, | |
1903 | {TIPC_NLA_STATS_LINK_CONGS, stats->link_congs}, | |
1904 | {TIPC_NLA_STATS_MAX_QUEUE, stats->max_queue_sz}, | |
1905 | {TIPC_NLA_STATS_AVG_QUEUE, stats->queue_sz_counts ? | |
1906 | (stats->accu_queue_sz / stats->queue_sz_counts) : 0} | |
1907 | }; | |
1908 | ||
1909 | nest = nla_nest_start(skb, TIPC_NLA_LINK_STATS); | |
1910 | if (!nest) | |
1911 | return -EMSGSIZE; | |
1912 | ||
1913 | for (i = 0; i < ARRAY_SIZE(map); i++) | |
1914 | if (nla_put_u32(skb, map[i].key, map[i].val)) | |
1915 | goto msg_full; | |
1916 | ||
1917 | nla_nest_end(skb, nest); | |
1918 | ||
1919 | return 0; | |
1920 | msg_full: | |
1921 | nla_nest_cancel(skb, nest); | |
1922 | ||
1923 | return -EMSGSIZE; | |
1924 | } | |
1925 | ||
1926 | int tipc_nl_add_bc_link(struct net *net, struct tipc_nl_msg *msg) | |
1927 | { | |
1928 | int err; | |
1929 | void *hdr; | |
1930 | struct nlattr *attrs; | |
1931 | struct nlattr *prop; | |
1932 | struct tipc_net *tn = net_generic(net, tipc_net_id); | |
1933 | struct tipc_link *bcl = tn->bcl; | |
1934 | ||
1935 | if (!bcl) | |
1936 | return 0; | |
1937 | ||
1938 | tipc_bcast_lock(net); | |
1939 | ||
1940 | hdr = genlmsg_put(msg->skb, msg->portid, msg->seq, &tipc_genl_family, | |
1941 | NLM_F_MULTI, TIPC_NL_LINK_GET); | |
b53ce3e7 IY |
1942 | if (!hdr) { |
1943 | tipc_bcast_unlock(net); | |
38206d59 | 1944 | return -EMSGSIZE; |
b53ce3e7 | 1945 | } |
38206d59 JPM |
1946 | |
1947 | attrs = nla_nest_start(msg->skb, TIPC_NLA_LINK); | |
1948 | if (!attrs) | |
1949 | goto msg_full; | |
1950 | ||
1951 | /* The broadcast link is always up */ | |
1952 | if (nla_put_flag(msg->skb, TIPC_NLA_LINK_UP)) | |
1953 | goto attr_msg_full; | |
1954 | ||
1955 | if (nla_put_flag(msg->skb, TIPC_NLA_LINK_BROADCAST)) | |
1956 | goto attr_msg_full; | |
1957 | if (nla_put_string(msg->skb, TIPC_NLA_LINK_NAME, bcl->name)) | |
1958 | goto attr_msg_full; | |
1959 | if (nla_put_u32(msg->skb, TIPC_NLA_LINK_RX, bcl->rcv_nxt)) | |
1960 | goto attr_msg_full; | |
1961 | if (nla_put_u32(msg->skb, TIPC_NLA_LINK_TX, bcl->snd_nxt)) | |
1962 | goto attr_msg_full; | |
1963 | ||
1964 | prop = nla_nest_start(msg->skb, TIPC_NLA_LINK_PROP); | |
1965 | if (!prop) | |
1966 | goto attr_msg_full; | |
1967 | if (nla_put_u32(msg->skb, TIPC_NLA_PROP_WIN, bcl->window)) | |
1968 | goto prop_msg_full; | |
1969 | nla_nest_end(msg->skb, prop); | |
1970 | ||
1971 | err = __tipc_nl_add_bc_link_stat(msg->skb, &bcl->stats); | |
1972 | if (err) | |
1973 | goto attr_msg_full; | |
1974 | ||
1975 | tipc_bcast_unlock(net); | |
1976 | nla_nest_end(msg->skb, attrs); | |
1977 | genlmsg_end(msg->skb, hdr); | |
1978 | ||
1979 | return 0; | |
1980 | ||
1981 | prop_msg_full: | |
1982 | nla_nest_cancel(msg->skb, prop); | |
1983 | attr_msg_full: | |
1984 | nla_nest_cancel(msg->skb, attrs); | |
1985 | msg_full: | |
1986 | tipc_bcast_unlock(net); | |
1987 | genlmsg_cancel(msg->skb, hdr); | |
1988 | ||
1989 | return -EMSGSIZE; | |
1990 | } | |
1991 | ||
d01332f1 RA |
1992 | void tipc_link_set_tolerance(struct tipc_link *l, u32 tol, |
1993 | struct sk_buff_head *xmitq) | |
38206d59 JPM |
1994 | { |
1995 | l->tolerance = tol; | |
d01332f1 | 1996 | tipc_link_build_proto_msg(l, STATE_MSG, 0, 0, tol, 0, xmitq); |
38206d59 JPM |
1997 | } |
1998 | ||
d01332f1 RA |
1999 | void tipc_link_set_prio(struct tipc_link *l, u32 prio, |
2000 | struct sk_buff_head *xmitq) | |
38206d59 JPM |
2001 | { |
2002 | l->priority = prio; | |
d01332f1 | 2003 | tipc_link_build_proto_msg(l, STATE_MSG, 0, 0, 0, prio, xmitq); |
38206d59 JPM |
2004 | } |
2005 | ||
2006 | void tipc_link_set_abort_limit(struct tipc_link *l, u32 limit) | |
2007 | { | |
2008 | l->abort_limit = limit; | |
2009 | } |