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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" |
35c55c98 | 45 | #include "monitor.h" |
b97bf3fd | 46 | |
796c75d0 YX |
47 | #include <linux/pkt_sched.h> |
48 | ||
38206d59 | 49 | struct tipc_stats { |
95901122 JPM |
50 | u32 sent_pkts; |
51 | u32 recv_pkts; | |
38206d59 JPM |
52 | u32 sent_states; |
53 | u32 recv_states; | |
54 | u32 sent_probes; | |
55 | u32 recv_probes; | |
56 | u32 sent_nacks; | |
57 | u32 recv_nacks; | |
58 | u32 sent_acks; | |
59 | u32 sent_bundled; | |
60 | u32 sent_bundles; | |
61 | u32 recv_bundled; | |
62 | u32 recv_bundles; | |
63 | u32 retransmitted; | |
64 | u32 sent_fragmented; | |
65 | u32 sent_fragments; | |
66 | u32 recv_fragmented; | |
67 | u32 recv_fragments; | |
68 | u32 link_congs; /* # port sends blocked by congestion */ | |
69 | u32 deferred_recv; | |
70 | u32 duplicates; | |
71 | u32 max_queue_sz; /* send queue size high water mark */ | |
72 | u32 accu_queue_sz; /* used for send queue size profiling */ | |
73 | u32 queue_sz_counts; /* used for send queue size profiling */ | |
74 | u32 msg_length_counts; /* used for message length profiling */ | |
75 | u32 msg_lengths_total; /* used for message length profiling */ | |
76 | u32 msg_length_profile[7]; /* used for msg. length profiling */ | |
77 | }; | |
78 | ||
79 | /** | |
80 | * struct tipc_link - TIPC link data structure | |
81 | * @addr: network address of link's peer node | |
82 | * @name: link name character string | |
83 | * @media_addr: media address to use when sending messages over link | |
84 | * @timer: link timer | |
85 | * @net: pointer to namespace struct | |
86 | * @refcnt: reference counter for permanent references (owner node & timer) | |
87 | * @peer_session: link session # being used by peer end of link | |
88 | * @peer_bearer_id: bearer id used by link's peer endpoint | |
89 | * @bearer_id: local bearer id used by link | |
90 | * @tolerance: minimum link continuity loss needed to reset link [in ms] | |
38206d59 JPM |
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') | |
35c55c98 | 99 | * @mon_state: cookie with information needed by link monitor |
38206d59 JPM |
100 | * @backlog_limit: backlog queue congestion thresholds (indexed by importance) |
101 | * @exp_msg_count: # of tunnelled messages expected during link changeover | |
102 | * @reset_rcv_checkpt: seq # of last acknowledged message at time of link reset | |
103 | * @mtu: current maximum packet size for this link | |
104 | * @advertised_mtu: advertised own mtu when link is being established | |
105 | * @transmitq: queue for sent, non-acked messages | |
106 | * @backlogq: queue for messages waiting to be sent | |
107 | * @snt_nxt: next sequence number to use for outbound messages | |
108 | * @last_retransmitted: sequence number of most recently retransmitted message | |
109 | * @stale_count: # of identical retransmit requests made by peer | |
110 | * @ackers: # of peers that needs to ack each packet before it can be released | |
111 | * @acked: # last packet acked by a certain peer. Used for broadcast. | |
112 | * @rcv_nxt: next sequence number to expect for inbound messages | |
113 | * @deferred_queue: deferred queue saved OOS b'cast message received from node | |
114 | * @unacked_window: # of inbound messages rx'd without ack'ing back to peer | |
115 | * @inputq: buffer queue for messages to be delivered upwards | |
116 | * @namedq: buffer queue for name table messages to be delivered upwards | |
117 | * @next_out: ptr to first unsent outbound message in queue | |
118 | * @wakeupq: linked list of wakeup msgs waiting for link congestion to abate | |
119 | * @long_msg_seq_no: next identifier to use for outbound fragmented messages | |
120 | * @reasm_buf: head of partially reassembled inbound message fragments | |
121 | * @bc_rcvr: marks that this is a broadcast receiver link | |
122 | * @stats: collects statistics regarding link activity | |
123 | */ | |
124 | struct tipc_link { | |
125 | u32 addr; | |
126 | char name[TIPC_MAX_LINK_NAME]; | |
38206d59 JPM |
127 | struct net *net; |
128 | ||
129 | /* Management and link supervision data */ | |
130 | u32 peer_session; | |
e74a386d | 131 | u32 session; |
38206d59 JPM |
132 | u32 peer_bearer_id; |
133 | u32 bearer_id; | |
134 | u32 tolerance; | |
38206d59 JPM |
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; | |
35c55c98 | 143 | struct tipc_mon_state mon_state; |
88e8ac70 | 144 | u16 rst_cnt; |
38206d59 JPM |
145 | |
146 | /* Failover/synch */ | |
147 | u16 drop_point; | |
148 | struct sk_buff *failover_reasm_skb; | |
149 | ||
150 | /* Max packet negotiation */ | |
151 | u16 mtu; | |
152 | u16 advertised_mtu; | |
153 | ||
154 | /* Sending */ | |
155 | struct sk_buff_head transmq; | |
156 | struct sk_buff_head backlogq; | |
157 | struct { | |
158 | u16 len; | |
159 | u16 limit; | |
b71ea3cd | 160 | struct sk_buff *target_bskb; |
38206d59 JPM |
161 | } backlog[5]; |
162 | u16 snd_nxt; | |
163 | u16 last_retransm; | |
164 | u16 window; | |
165 | u32 stale_count; | |
166 | ||
167 | /* Reception */ | |
168 | u16 rcv_nxt; | |
169 | u32 rcv_unacked; | |
170 | struct sk_buff_head deferdq; | |
171 | struct sk_buff_head *inputq; | |
172 | struct sk_buff_head *namedq; | |
173 | ||
174 | /* Congestion handling */ | |
175 | struct sk_buff_head wakeupq; | |
176 | ||
177 | /* Fragmentation/reassembly */ | |
178 | struct sk_buff *reasm_buf; | |
179 | ||
180 | /* Broadcast */ | |
181 | u16 ackers; | |
182 | u16 acked; | |
183 | struct tipc_link *bc_rcvlink; | |
184 | struct tipc_link *bc_sndlink; | |
7c4a54b9 JPM |
185 | unsigned long prev_retr; |
186 | u16 prev_from; | |
187 | u16 prev_to; | |
188 | u8 nack_state; | |
38206d59 JPM |
189 | bool bc_peer_is_up; |
190 | ||
191 | /* Statistics */ | |
192 | struct tipc_stats stats; | |
193 | }; | |
194 | ||
2cf8aa19 EH |
195 | /* |
196 | * Error message prefixes | |
197 | */ | |
6e498158 | 198 | static const char *link_co_err = "Link tunneling error, "; |
2cf8aa19 | 199 | static const char *link_rst_msg = "Resetting link "; |
7be57fc6 | 200 | |
52666986 JPM |
201 | /* Send states for broadcast NACKs |
202 | */ | |
203 | enum { | |
204 | BC_NACK_SND_CONDITIONAL, | |
205 | BC_NACK_SND_UNCONDITIONAL, | |
206 | BC_NACK_SND_SUPPRESS, | |
207 | }; | |
208 | ||
7c4a54b9 JPM |
209 | #define TIPC_BC_RETR_LIMIT 10 /* [ms] */ |
210 | ||
d999297c JPM |
211 | /* |
212 | * Interval between NACKs when packets arrive out of order | |
213 | */ | |
214 | #define TIPC_NACK_INTV (TIPC_MIN_LINK_WIN * 2) | |
e74a386d JPM |
215 | |
216 | /* Wildcard value for link session numbers. When it is known that | |
217 | * peer endpoint is down, any session number must be accepted. | |
a686e685 | 218 | */ |
e74a386d | 219 | #define ANY_SESSION 0x10000 |
a686e685 | 220 | |
662921cd | 221 | /* Link FSM states: |
b97bf3fd | 222 | */ |
d3504c34 | 223 | enum { |
662921cd JPM |
224 | LINK_ESTABLISHED = 0xe, |
225 | LINK_ESTABLISHING = 0xe << 4, | |
226 | LINK_RESET = 0x1 << 8, | |
227 | LINK_RESETTING = 0x2 << 12, | |
228 | LINK_PEER_RESET = 0xd << 16, | |
229 | LINK_FAILINGOVER = 0xf << 20, | |
230 | LINK_SYNCHING = 0xc << 24 | |
d3504c34 JPM |
231 | }; |
232 | ||
233 | /* Link FSM state checking routines | |
234 | */ | |
662921cd | 235 | static int link_is_up(struct tipc_link *l) |
d3504c34 | 236 | { |
662921cd | 237 | return l->state & (LINK_ESTABLISHED | LINK_SYNCHING); |
d3504c34 | 238 | } |
b97bf3fd | 239 | |
d999297c JPM |
240 | static int tipc_link_proto_rcv(struct tipc_link *l, struct sk_buff *skb, |
241 | struct sk_buff_head *xmitq); | |
426cc2b8 | 242 | static void tipc_link_build_proto_msg(struct tipc_link *l, int mtyp, bool probe, |
8d6e79d3 JM |
243 | bool probe_reply, u16 rcvgap, |
244 | int tolerance, int priority, | |
426cc2b8 | 245 | struct sk_buff_head *xmitq); |
1a90632d | 246 | static void link_print(struct tipc_link *l, const char *str); |
e0a05ebe JPM |
247 | static int tipc_link_build_nack_msg(struct tipc_link *l, |
248 | struct sk_buff_head *xmitq); | |
52666986 JPM |
249 | static void tipc_link_build_bc_init_msg(struct tipc_link *l, |
250 | struct sk_buff_head *xmitq); | |
251 | static bool tipc_link_release_pkts(struct tipc_link *l, u16 to); | |
8b4ed863 | 252 | |
b97bf3fd | 253 | /* |
05790c64 | 254 | * Simple non-static link routines (i.e. referenced outside this file) |
b97bf3fd | 255 | */ |
662921cd | 256 | bool tipc_link_is_up(struct tipc_link *l) |
b97bf3fd | 257 | { |
662921cd JPM |
258 | return link_is_up(l); |
259 | } | |
260 | ||
c8199300 JPM |
261 | bool tipc_link_peer_is_down(struct tipc_link *l) |
262 | { | |
263 | return l->state == LINK_PEER_RESET; | |
264 | } | |
265 | ||
662921cd JPM |
266 | bool tipc_link_is_reset(struct tipc_link *l) |
267 | { | |
268 | return l->state & (LINK_RESET | LINK_FAILINGOVER | LINK_ESTABLISHING); | |
269 | } | |
270 | ||
73f646ce JPM |
271 | bool tipc_link_is_establishing(struct tipc_link *l) |
272 | { | |
273 | return l->state == LINK_ESTABLISHING; | |
274 | } | |
275 | ||
662921cd JPM |
276 | bool tipc_link_is_synching(struct tipc_link *l) |
277 | { | |
278 | return l->state == LINK_SYNCHING; | |
279 | } | |
280 | ||
281 | bool tipc_link_is_failingover(struct tipc_link *l) | |
282 | { | |
283 | return l->state == LINK_FAILINGOVER; | |
284 | } | |
285 | ||
286 | bool tipc_link_is_blocked(struct tipc_link *l) | |
287 | { | |
288 | return l->state & (LINK_RESETTING | LINK_PEER_RESET | LINK_FAILINGOVER); | |
b97bf3fd PL |
289 | } |
290 | ||
742e0383 | 291 | static bool link_is_bc_sndlink(struct tipc_link *l) |
52666986 JPM |
292 | { |
293 | return !l->bc_sndlink; | |
294 | } | |
295 | ||
742e0383 | 296 | static bool link_is_bc_rcvlink(struct tipc_link *l) |
52666986 JPM |
297 | { |
298 | return ((l->bc_rcvlink == l) && !link_is_bc_sndlink(l)); | |
299 | } | |
300 | ||
9d13ec65 | 301 | int tipc_link_is_active(struct tipc_link *l) |
b97bf3fd | 302 | { |
c72fa872 JPM |
303 | return l->active; |
304 | } | |
9d13ec65 | 305 | |
c72fa872 JPM |
306 | void tipc_link_set_active(struct tipc_link *l, bool active) |
307 | { | |
308 | l->active = active; | |
b97bf3fd PL |
309 | } |
310 | ||
38206d59 JPM |
311 | u32 tipc_link_id(struct tipc_link *l) |
312 | { | |
313 | return l->peer_bearer_id << 16 | l->bearer_id; | |
314 | } | |
315 | ||
316 | int tipc_link_window(struct tipc_link *l) | |
317 | { | |
318 | return l->window; | |
319 | } | |
320 | ||
321 | int tipc_link_prio(struct tipc_link *l) | |
322 | { | |
323 | return l->priority; | |
324 | } | |
325 | ||
326 | unsigned long tipc_link_tolerance(struct tipc_link *l) | |
327 | { | |
328 | return l->tolerance; | |
329 | } | |
330 | ||
331 | struct sk_buff_head *tipc_link_inputq(struct tipc_link *l) | |
332 | { | |
333 | return l->inputq; | |
334 | } | |
335 | ||
336 | char tipc_link_plane(struct tipc_link *l) | |
337 | { | |
338 | return l->net_plane; | |
339 | } | |
340 | ||
52666986 JPM |
341 | void tipc_link_add_bc_peer(struct tipc_link *snd_l, |
342 | struct tipc_link *uc_l, | |
343 | struct sk_buff_head *xmitq) | |
2f566124 | 344 | { |
52666986 JPM |
345 | struct tipc_link *rcv_l = uc_l->bc_rcvlink; |
346 | ||
347 | snd_l->ackers++; | |
348 | rcv_l->acked = snd_l->snd_nxt - 1; | |
9a650838 | 349 | snd_l->state = LINK_ESTABLISHED; |
52666986 | 350 | tipc_link_build_bc_init_msg(uc_l, xmitq); |
2f566124 JPM |
351 | } |
352 | ||
52666986 JPM |
353 | void tipc_link_remove_bc_peer(struct tipc_link *snd_l, |
354 | struct tipc_link *rcv_l, | |
355 | struct sk_buff_head *xmitq) | |
2f566124 | 356 | { |
52666986 JPM |
357 | u16 ack = snd_l->snd_nxt - 1; |
358 | ||
359 | snd_l->ackers--; | |
a71eb720 JPM |
360 | rcv_l->bc_peer_is_up = true; |
361 | rcv_l->state = LINK_ESTABLISHED; | |
52666986 JPM |
362 | tipc_link_bc_ack_rcv(rcv_l, ack, xmitq); |
363 | tipc_link_reset(rcv_l); | |
364 | rcv_l->state = LINK_RESET; | |
365 | if (!snd_l->ackers) { | |
366 | tipc_link_reset(snd_l); | |
9a650838 | 367 | snd_l->state = LINK_RESET; |
52666986 JPM |
368 | __skb_queue_purge(xmitq); |
369 | } | |
2f566124 JPM |
370 | } |
371 | ||
372 | int tipc_link_bc_peers(struct tipc_link *l) | |
373 | { | |
374 | return l->ackers; | |
375 | } | |
376 | ||
02d11ca2 JPM |
377 | u16 link_bc_rcv_gap(struct tipc_link *l) |
378 | { | |
379 | struct sk_buff *skb = skb_peek(&l->deferdq); | |
380 | u16 gap = 0; | |
381 | ||
382 | if (more(l->snd_nxt, l->rcv_nxt)) | |
383 | gap = l->snd_nxt - l->rcv_nxt; | |
384 | if (skb) | |
385 | gap = buf_seqno(skb) - l->rcv_nxt; | |
386 | return gap; | |
387 | } | |
388 | ||
959e1781 JPM |
389 | void tipc_link_set_mtu(struct tipc_link *l, int mtu) |
390 | { | |
391 | l->mtu = mtu; | |
392 | } | |
393 | ||
394 | int tipc_link_mtu(struct tipc_link *l) | |
395 | { | |
396 | return l->mtu; | |
397 | } | |
398 | ||
38206d59 JPM |
399 | u16 tipc_link_rcv_nxt(struct tipc_link *l) |
400 | { | |
401 | return l->rcv_nxt; | |
402 | } | |
403 | ||
404 | u16 tipc_link_acked(struct tipc_link *l) | |
405 | { | |
406 | return l->acked; | |
407 | } | |
408 | ||
409 | char *tipc_link_name(struct tipc_link *l) | |
410 | { | |
411 | return l->name; | |
412 | } | |
413 | ||
b97bf3fd | 414 | /** |
4323add6 | 415 | * tipc_link_create - create a new link |
440d8963 | 416 | * @n: pointer to associated node |
0e05498e JPM |
417 | * @if_name: associated interface name |
418 | * @bearer_id: id (index) of associated bearer | |
419 | * @tolerance: link tolerance to be used by link | |
420 | * @net_plane: network plane (A,B,c..) this link belongs to | |
421 | * @mtu: mtu to be advertised by link | |
422 | * @priority: priority to be used by link | |
423 | * @window: send window to be used by link | |
424 | * @session: session to be used by link | |
440d8963 | 425 | * @ownnode: identity of own node |
0e05498e | 426 | * @peer: node id of peer node |
fd556f20 | 427 | * @peer_caps: bitmap describing peer node capabilities |
52666986 JPM |
428 | * @bc_sndlink: the namespace global link used for broadcast sending |
429 | * @bc_rcvlink: the peer specific link used for broadcast reception | |
440d8963 JPM |
430 | * @inputq: queue to put messages ready for delivery |
431 | * @namedq: queue to put binding table update messages ready for delivery | |
432 | * @link: return value, pointer to put the created link | |
c4307285 | 433 | * |
440d8963 | 434 | * Returns true if link was created, otherwise false |
b97bf3fd | 435 | */ |
c72fa872 | 436 | bool tipc_link_create(struct net *net, char *if_name, int bearer_id, |
0e05498e JPM |
437 | int tolerance, char net_plane, u32 mtu, int priority, |
438 | int window, u32 session, u32 ownnode, u32 peer, | |
52666986 | 439 | u16 peer_caps, |
52666986 JPM |
440 | struct tipc_link *bc_sndlink, |
441 | struct tipc_link *bc_rcvlink, | |
442 | struct sk_buff_head *inputq, | |
443 | struct sk_buff_head *namedq, | |
440d8963 | 444 | struct tipc_link **link) |
b97bf3fd | 445 | { |
440d8963 | 446 | struct tipc_link *l; |
37b9c08a | 447 | |
440d8963 JPM |
448 | l = kzalloc(sizeof(*l), GFP_ATOMIC); |
449 | if (!l) | |
450 | return false; | |
451 | *link = l; | |
e74a386d | 452 | l->session = session; |
37b9c08a | 453 | |
440d8963 | 454 | /* Note: peer i/f name is completed by reset/activate message */ |
440d8963 JPM |
455 | sprintf(l->name, "%u.%u.%u:%s-%u.%u.%u:unknown", |
456 | tipc_zone(ownnode), tipc_cluster(ownnode), tipc_node(ownnode), | |
457 | if_name, tipc_zone(peer), tipc_cluster(peer), tipc_node(peer)); | |
e74a386d | 458 | strcpy(l->if_name, if_name); |
440d8963 | 459 | l->addr = peer; |
fd556f20 | 460 | l->peer_caps = peer_caps; |
c72fa872 | 461 | l->net = net; |
e74a386d | 462 | l->peer_session = ANY_SESSION; |
0e05498e JPM |
463 | l->bearer_id = bearer_id; |
464 | l->tolerance = tolerance; | |
465 | l->net_plane = net_plane; | |
466 | l->advertised_mtu = mtu; | |
467 | l->mtu = mtu; | |
468 | l->priority = priority; | |
469 | tipc_link_set_queue_limits(l, window); | |
c1ab3f1d | 470 | l->ackers = 1; |
52666986 JPM |
471 | l->bc_sndlink = bc_sndlink; |
472 | l->bc_rcvlink = bc_rcvlink; | |
440d8963 JPM |
473 | l->inputq = inputq; |
474 | l->namedq = namedq; | |
475 | l->state = LINK_RESETTING; | |
440d8963 JPM |
476 | __skb_queue_head_init(&l->transmq); |
477 | __skb_queue_head_init(&l->backlogq); | |
478 | __skb_queue_head_init(&l->deferdq); | |
479 | skb_queue_head_init(&l->wakeupq); | |
480 | skb_queue_head_init(l->inputq); | |
481 | return true; | |
b97bf3fd PL |
482 | } |
483 | ||
32301906 JPM |
484 | /** |
485 | * tipc_link_bc_create - create new link to be used for broadcast | |
486 | * @n: pointer to associated node | |
487 | * @mtu: mtu to be used | |
488 | * @window: send window to be used | |
489 | * @inputq: queue to put messages ready for delivery | |
490 | * @namedq: queue to put binding table update messages ready for delivery | |
491 | * @link: return value, pointer to put the created link | |
492 | * | |
493 | * Returns true if link was created, otherwise false | |
494 | */ | |
c72fa872 | 495 | bool tipc_link_bc_create(struct net *net, u32 ownnode, u32 peer, |
52666986 | 496 | int mtu, int window, u16 peer_caps, |
32301906 JPM |
497 | struct sk_buff_head *inputq, |
498 | struct sk_buff_head *namedq, | |
52666986 | 499 | struct tipc_link *bc_sndlink, |
32301906 JPM |
500 | struct tipc_link **link) |
501 | { | |
502 | struct tipc_link *l; | |
503 | ||
c72fa872 | 504 | if (!tipc_link_create(net, "", MAX_BEARERS, 0, 'Z', mtu, 0, window, |
2af5ae37 | 505 | 0, ownnode, peer, peer_caps, bc_sndlink, |
52666986 | 506 | NULL, inputq, namedq, link)) |
32301906 JPM |
507 | return false; |
508 | ||
509 | l = *link; | |
510 | strcpy(l->name, tipc_bclink_name); | |
511 | tipc_link_reset(l); | |
52666986 | 512 | l->state = LINK_RESET; |
2f566124 | 513 | l->ackers = 0; |
52666986 | 514 | l->bc_rcvlink = l; |
32301906 | 515 | |
52666986 JPM |
516 | /* Broadcast send link is always up */ |
517 | if (link_is_bc_sndlink(l)) | |
518 | l->state = LINK_ESTABLISHED; | |
d999297c | 519 | |
01fd12bb JPM |
520 | /* Disable replicast if even a single peer doesn't support it */ |
521 | if (link_is_bc_rcvlink(l) && !(peer_caps & TIPC_BCAST_RCAST)) | |
522 | tipc_bcast_disable_rcast(net); | |
523 | ||
52666986 | 524 | return true; |
d999297c JPM |
525 | } |
526 | ||
6ab30f9c JPM |
527 | /** |
528 | * tipc_link_fsm_evt - link finite state machine | |
529 | * @l: pointer to link | |
530 | * @evt: state machine event to be processed | |
6ab30f9c | 531 | */ |
662921cd | 532 | int tipc_link_fsm_evt(struct tipc_link *l, int evt) |
6ab30f9c | 533 | { |
5045f7b9 | 534 | int rc = 0; |
6ab30f9c JPM |
535 | |
536 | switch (l->state) { | |
662921cd | 537 | case LINK_RESETTING: |
6ab30f9c | 538 | switch (evt) { |
662921cd JPM |
539 | case LINK_PEER_RESET_EVT: |
540 | l->state = LINK_PEER_RESET; | |
6ab30f9c | 541 | break; |
662921cd JPM |
542 | case LINK_RESET_EVT: |
543 | l->state = LINK_RESET; | |
544 | break; | |
545 | case LINK_FAILURE_EVT: | |
546 | case LINK_FAILOVER_BEGIN_EVT: | |
547 | case LINK_ESTABLISH_EVT: | |
548 | case LINK_FAILOVER_END_EVT: | |
549 | case LINK_SYNCH_BEGIN_EVT: | |
550 | case LINK_SYNCH_END_EVT: | |
551 | default: | |
552 | goto illegal_evt; | |
553 | } | |
554 | break; | |
555 | case LINK_RESET: | |
556 | switch (evt) { | |
557 | case LINK_PEER_RESET_EVT: | |
558 | l->state = LINK_ESTABLISHING; | |
6ab30f9c | 559 | break; |
662921cd JPM |
560 | case LINK_FAILOVER_BEGIN_EVT: |
561 | l->state = LINK_FAILINGOVER; | |
562 | case LINK_FAILURE_EVT: | |
563 | case LINK_RESET_EVT: | |
564 | case LINK_ESTABLISH_EVT: | |
565 | case LINK_FAILOVER_END_EVT: | |
6ab30f9c | 566 | break; |
662921cd JPM |
567 | case LINK_SYNCH_BEGIN_EVT: |
568 | case LINK_SYNCH_END_EVT: | |
6ab30f9c | 569 | default: |
662921cd | 570 | goto illegal_evt; |
6ab30f9c JPM |
571 | } |
572 | break; | |
662921cd | 573 | case LINK_PEER_RESET: |
6ab30f9c | 574 | switch (evt) { |
662921cd JPM |
575 | case LINK_RESET_EVT: |
576 | l->state = LINK_ESTABLISHING; | |
6ab30f9c | 577 | break; |
662921cd JPM |
578 | case LINK_PEER_RESET_EVT: |
579 | case LINK_ESTABLISH_EVT: | |
580 | case LINK_FAILURE_EVT: | |
6ab30f9c | 581 | break; |
662921cd JPM |
582 | case LINK_SYNCH_BEGIN_EVT: |
583 | case LINK_SYNCH_END_EVT: | |
584 | case LINK_FAILOVER_BEGIN_EVT: | |
585 | case LINK_FAILOVER_END_EVT: | |
586 | default: | |
587 | goto illegal_evt; | |
588 | } | |
589 | break; | |
590 | case LINK_FAILINGOVER: | |
591 | switch (evt) { | |
592 | case LINK_FAILOVER_END_EVT: | |
593 | l->state = LINK_RESET; | |
6ab30f9c | 594 | break; |
662921cd JPM |
595 | case LINK_PEER_RESET_EVT: |
596 | case LINK_RESET_EVT: | |
597 | case LINK_ESTABLISH_EVT: | |
598 | case LINK_FAILURE_EVT: | |
599 | break; | |
600 | case LINK_FAILOVER_BEGIN_EVT: | |
601 | case LINK_SYNCH_BEGIN_EVT: | |
602 | case LINK_SYNCH_END_EVT: | |
6ab30f9c | 603 | default: |
662921cd | 604 | goto illegal_evt; |
6ab30f9c JPM |
605 | } |
606 | break; | |
662921cd | 607 | case LINK_ESTABLISHING: |
6ab30f9c | 608 | switch (evt) { |
662921cd JPM |
609 | case LINK_ESTABLISH_EVT: |
610 | l->state = LINK_ESTABLISHED; | |
6ab30f9c | 611 | break; |
662921cd JPM |
612 | case LINK_FAILOVER_BEGIN_EVT: |
613 | l->state = LINK_FAILINGOVER; | |
614 | break; | |
662921cd | 615 | case LINK_RESET_EVT: |
73f646ce JPM |
616 | l->state = LINK_RESET; |
617 | break; | |
662921cd | 618 | case LINK_FAILURE_EVT: |
73f646ce | 619 | case LINK_PEER_RESET_EVT: |
662921cd JPM |
620 | case LINK_SYNCH_BEGIN_EVT: |
621 | case LINK_FAILOVER_END_EVT: | |
622 | break; | |
623 | case LINK_SYNCH_END_EVT: | |
624 | default: | |
625 | goto illegal_evt; | |
626 | } | |
627 | break; | |
628 | case LINK_ESTABLISHED: | |
629 | switch (evt) { | |
630 | case LINK_PEER_RESET_EVT: | |
631 | l->state = LINK_PEER_RESET; | |
632 | rc |= TIPC_LINK_DOWN_EVT; | |
633 | break; | |
634 | case LINK_FAILURE_EVT: | |
635 | l->state = LINK_RESETTING; | |
636 | rc |= TIPC_LINK_DOWN_EVT; | |
6ab30f9c | 637 | break; |
662921cd JPM |
638 | case LINK_RESET_EVT: |
639 | l->state = LINK_RESET; | |
6ab30f9c | 640 | break; |
662921cd | 641 | case LINK_ESTABLISH_EVT: |
5ae2f8e6 | 642 | case LINK_SYNCH_END_EVT: |
6ab30f9c | 643 | break; |
662921cd JPM |
644 | case LINK_SYNCH_BEGIN_EVT: |
645 | l->state = LINK_SYNCHING; | |
646 | break; | |
662921cd JPM |
647 | case LINK_FAILOVER_BEGIN_EVT: |
648 | case LINK_FAILOVER_END_EVT: | |
6ab30f9c | 649 | default: |
662921cd | 650 | goto illegal_evt; |
6ab30f9c JPM |
651 | } |
652 | break; | |
662921cd | 653 | case LINK_SYNCHING: |
6ab30f9c | 654 | switch (evt) { |
662921cd JPM |
655 | case LINK_PEER_RESET_EVT: |
656 | l->state = LINK_PEER_RESET; | |
657 | rc |= TIPC_LINK_DOWN_EVT; | |
658 | break; | |
659 | case LINK_FAILURE_EVT: | |
660 | l->state = LINK_RESETTING; | |
661 | rc |= TIPC_LINK_DOWN_EVT; | |
6ab30f9c | 662 | break; |
662921cd JPM |
663 | case LINK_RESET_EVT: |
664 | l->state = LINK_RESET; | |
6ab30f9c | 665 | break; |
662921cd JPM |
666 | case LINK_ESTABLISH_EVT: |
667 | case LINK_SYNCH_BEGIN_EVT: | |
6ab30f9c | 668 | break; |
662921cd JPM |
669 | case LINK_SYNCH_END_EVT: |
670 | l->state = LINK_ESTABLISHED; | |
671 | break; | |
672 | case LINK_FAILOVER_BEGIN_EVT: | |
673 | case LINK_FAILOVER_END_EVT: | |
6ab30f9c | 674 | default: |
662921cd | 675 | goto illegal_evt; |
6ab30f9c JPM |
676 | } |
677 | break; | |
678 | default: | |
662921cd | 679 | pr_err("Unknown FSM state %x in %s\n", l->state, l->name); |
6ab30f9c | 680 | } |
662921cd JPM |
681 | return rc; |
682 | illegal_evt: | |
683 | pr_err("Illegal FSM event %x in state %x on link %s\n", | |
684 | evt, l->state, l->name); | |
6ab30f9c JPM |
685 | return rc; |
686 | } | |
687 | ||
333ef69e JPM |
688 | /* link_profile_stats - update statistical profiling of traffic |
689 | */ | |
690 | static void link_profile_stats(struct tipc_link *l) | |
691 | { | |
692 | struct sk_buff *skb; | |
693 | struct tipc_msg *msg; | |
694 | int length; | |
695 | ||
696 | /* Update counters used in statistical profiling of send traffic */ | |
697 | l->stats.accu_queue_sz += skb_queue_len(&l->transmq); | |
698 | l->stats.queue_sz_counts++; | |
699 | ||
700 | skb = skb_peek(&l->transmq); | |
701 | if (!skb) | |
702 | return; | |
703 | msg = buf_msg(skb); | |
704 | length = msg_size(msg); | |
705 | ||
706 | if (msg_user(msg) == MSG_FRAGMENTER) { | |
707 | if (msg_type(msg) != FIRST_FRAGMENT) | |
708 | return; | |
709 | length = msg_size(msg_get_wrapped(msg)); | |
710 | } | |
711 | l->stats.msg_lengths_total += length; | |
712 | l->stats.msg_length_counts++; | |
713 | if (length <= 64) | |
714 | l->stats.msg_length_profile[0]++; | |
715 | else if (length <= 256) | |
716 | l->stats.msg_length_profile[1]++; | |
717 | else if (length <= 1024) | |
718 | l->stats.msg_length_profile[2]++; | |
719 | else if (length <= 4096) | |
720 | l->stats.msg_length_profile[3]++; | |
721 | else if (length <= 16384) | |
722 | l->stats.msg_length_profile[4]++; | |
723 | else if (length <= 32768) | |
724 | l->stats.msg_length_profile[5]++; | |
725 | else | |
726 | l->stats.msg_length_profile[6]++; | |
727 | } | |
728 | ||
729 | /* tipc_link_timeout - perform periodic task as instructed from node timeout | |
730 | */ | |
731 | int tipc_link_timeout(struct tipc_link *l, struct sk_buff_head *xmitq) | |
732 | { | |
c91522f8 YX |
733 | int mtyp = 0; |
734 | int rc = 0; | |
42b18f60 JPM |
735 | bool state = false; |
736 | bool probe = false; | |
737 | bool setup = false; | |
52666986 JPM |
738 | u16 bc_snt = l->bc_sndlink->snd_nxt - 1; |
739 | u16 bc_acked = l->bc_rcvlink->acked; | |
35c55c98 | 740 | struct tipc_mon_state *mstate = &l->mon_state; |
5045f7b9 | 741 | |
662921cd JPM |
742 | switch (l->state) { |
743 | case LINK_ESTABLISHED: | |
744 | case LINK_SYNCHING: | |
42b18f60 | 745 | mtyp = STATE_MSG; |
35c55c98 JPM |
746 | link_profile_stats(l); |
747 | tipc_mon_get_state(l->net, l->addr, mstate, l->bearer_id); | |
748 | if (mstate->reset || (l->silent_intv_cnt > l->abort_limit)) | |
749 | return tipc_link_fsm_evt(l, LINK_FAILURE_EVT); | |
42b18f60 | 750 | state = bc_acked != bc_snt; |
35c55c98 JPM |
751 | state |= l->bc_rcvlink->rcv_unacked; |
752 | state |= l->rcv_unacked; | |
753 | state |= !skb_queue_empty(&l->transmq); | |
754 | state |= !skb_queue_empty(&l->deferdq); | |
755 | probe = mstate->probing; | |
756 | probe |= l->silent_intv_cnt; | |
757 | if (probe || mstate->monitoring) | |
758 | l->silent_intv_cnt++; | |
662921cd JPM |
759 | break; |
760 | case LINK_RESET: | |
42b18f60 JPM |
761 | setup = l->rst_cnt++ <= 4; |
762 | setup |= !(l->rst_cnt % 16); | |
5045f7b9 | 763 | mtyp = RESET_MSG; |
662921cd JPM |
764 | break; |
765 | case LINK_ESTABLISHING: | |
42b18f60 | 766 | setup = true; |
5045f7b9 | 767 | mtyp = ACTIVATE_MSG; |
662921cd | 768 | break; |
662921cd | 769 | case LINK_PEER_RESET: |
598411d7 | 770 | case LINK_RESETTING: |
662921cd JPM |
771 | case LINK_FAILINGOVER: |
772 | break; | |
773 | default: | |
774 | break; | |
5045f7b9 | 775 | } |
662921cd | 776 | |
42b18f60 | 777 | if (state || probe || setup) |
8d6e79d3 | 778 | tipc_link_build_proto_msg(l, mtyp, probe, 0, 0, 0, 0, xmitq); |
5045f7b9 | 779 | |
333ef69e JPM |
780 | return rc; |
781 | } | |
782 | ||
b97bf3fd | 783 | /** |
3127a020 | 784 | * link_schedule_user - schedule a message sender for wakeup after congestion |
365ad353 JPM |
785 | * @l: congested link |
786 | * @hdr: header of message that is being sent | |
50100a5e | 787 | * Create pseudo msg to send back to user when congestion abates |
b97bf3fd | 788 | */ |
365ad353 | 789 | static int link_schedule_user(struct tipc_link *l, struct tipc_msg *hdr) |
b97bf3fd | 790 | { |
365ad353 JPM |
791 | u32 dnode = tipc_own_addr(l->net); |
792 | u32 dport = msg_origport(hdr); | |
3127a020 JPM |
793 | struct sk_buff *skb; |
794 | ||
3127a020 JPM |
795 | /* Create and schedule wakeup pseudo message */ |
796 | skb = tipc_msg_create(SOCK_WAKEUP, 0, INT_H_SIZE, 0, | |
365ad353 | 797 | dnode, l->addr, dport, 0, 0); |
3127a020 | 798 | if (!skb) |
22d85c79 | 799 | return -ENOBUFS; |
365ad353 JPM |
800 | msg_set_dest_droppable(buf_msg(skb), true); |
801 | TIPC_SKB_CB(skb)->chain_imp = msg_importance(hdr); | |
802 | skb_queue_tail(&l->wakeupq, skb); | |
803 | l->stats.link_congs++; | |
3127a020 | 804 | return -ELINKCONG; |
b97bf3fd PL |
805 | } |
806 | ||
50100a5e JPM |
807 | /** |
808 | * link_prepare_wakeup - prepare users for wakeup after congestion | |
365ad353 JPM |
809 | * @l: congested link |
810 | * Wake up a number of waiting users, as permitted by available space | |
811 | * in the send queue | |
50100a5e | 812 | */ |
1f66d161 | 813 | void link_prepare_wakeup(struct tipc_link *l) |
b97bf3fd | 814 | { |
45e0fc83 JM |
815 | struct sk_buff_head *wakeupq = &l->wakeupq; |
816 | struct sk_buff_head *inputq = l->inputq; | |
58d78b32 | 817 | struct sk_buff *skb, *tmp; |
45e0fc83 JM |
818 | struct sk_buff_head tmpq; |
819 | int avail[5] = {0,}; | |
820 | int imp = 0; | |
50100a5e | 821 | |
45e0fc83 JM |
822 | __skb_queue_head_init(&tmpq); |
823 | ||
824 | for (; imp <= TIPC_SYSTEM_IMPORTANCE; imp++) | |
825 | avail[imp] = l->backlog[imp].limit - l->backlog[imp].len; | |
826 | ||
827 | skb_queue_walk_safe(wakeupq, skb, tmp) { | |
1f66d161 | 828 | imp = TIPC_SKB_CB(skb)->chain_imp; |
45e0fc83 JM |
829 | if (avail[imp] <= 0) |
830 | continue; | |
831 | avail[imp]--; | |
832 | __skb_unlink(skb, wakeupq); | |
833 | __skb_queue_tail(&tmpq, skb); | |
b97bf3fd | 834 | } |
45e0fc83 JM |
835 | |
836 | spin_lock_bh(&inputq->lock); | |
837 | skb_queue_splice_tail(&tmpq, inputq); | |
838 | spin_unlock_bh(&inputq->lock); | |
839 | ||
b97bf3fd PL |
840 | } |
841 | ||
6e498158 | 842 | void tipc_link_reset(struct tipc_link *l) |
b97bf3fd | 843 | { |
b71ea3cd TL |
844 | u32 imp; |
845 | ||
e74a386d JPM |
846 | l->peer_session = ANY_SESSION; |
847 | l->session++; | |
6e498158 | 848 | l->mtu = l->advertised_mtu; |
6e498158 JPM |
849 | __skb_queue_purge(&l->transmq); |
850 | __skb_queue_purge(&l->deferdq); | |
23d8335d | 851 | skb_queue_splice_init(&l->wakeupq, l->inputq); |
2af5ae37 | 852 | __skb_queue_purge(&l->backlogq); |
b71ea3cd TL |
853 | for (imp = 0; imp <= TIPC_SYSTEM_IMPORTANCE; imp++) { |
854 | l->backlog[imp].len = 0; | |
855 | l->backlog[imp].target_bskb = NULL; | |
856 | } | |
6e498158 JPM |
857 | kfree_skb(l->reasm_buf); |
858 | kfree_skb(l->failover_reasm_skb); | |
859 | l->reasm_buf = NULL; | |
860 | l->failover_reasm_skb = NULL; | |
861 | l->rcv_unacked = 0; | |
862 | l->snd_nxt = 1; | |
863 | l->rcv_nxt = 1; | |
c1ab3f1d | 864 | l->acked = 0; |
6e498158 | 865 | l->silent_intv_cnt = 0; |
88e8ac70 | 866 | l->rst_cnt = 0; |
6e498158 | 867 | l->stale_count = 0; |
52666986 | 868 | l->bc_peer_is_up = false; |
35c55c98 | 869 | memset(&l->mon_state, 0, sizeof(l->mon_state)); |
38206d59 | 870 | tipc_link_reset_stats(l); |
b97bf3fd PL |
871 | } |
872 | ||
af9b028e JPM |
873 | /** |
874 | * tipc_link_xmit(): enqueue buffer list according to queue situation | |
875 | * @link: link to use | |
876 | * @list: chain of buffers containing message | |
877 | * @xmitq: returned list of packets to be sent by caller | |
878 | * | |
365ad353 | 879 | * Consumes the buffer chain. |
af9b028e JPM |
880 | * Returns 0 if success, or errno: -ELINKCONG, -EMSGSIZE or -ENOBUFS |
881 | * Messages at TIPC_SYSTEM_IMPORTANCE are always accepted | |
882 | */ | |
883 | int tipc_link_xmit(struct tipc_link *l, struct sk_buff_head *list, | |
884 | struct sk_buff_head *xmitq) | |
885 | { | |
886 | struct tipc_msg *hdr = buf_msg(skb_peek(list)); | |
887 | unsigned int maxwin = l->window; | |
365ad353 | 888 | int imp = msg_importance(hdr); |
af9b028e JPM |
889 | unsigned int mtu = l->mtu; |
890 | u16 ack = l->rcv_nxt - 1; | |
891 | u16 seqno = l->snd_nxt; | |
52666986 | 892 | u16 bc_ack = l->bc_rcvlink->rcv_nxt - 1; |
af9b028e JPM |
893 | struct sk_buff_head *transmq = &l->transmq; |
894 | struct sk_buff_head *backlogq = &l->backlogq; | |
b71ea3cd | 895 | struct sk_buff *skb, *_skb, **tskb; |
95901122 | 896 | int pkt_cnt = skb_queue_len(list); |
365ad353 | 897 | int rc = 0; |
af9b028e | 898 | |
4952cd3e RA |
899 | if (unlikely(msg_size(hdr) > mtu)) { |
900 | skb_queue_purge(list); | |
af9b028e | 901 | return -EMSGSIZE; |
4952cd3e | 902 | } |
af9b028e | 903 | |
365ad353 JPM |
904 | /* Allow oversubscription of one data msg per source at congestion */ |
905 | if (unlikely(l->backlog[imp].len >= l->backlog[imp].limit)) { | |
906 | if (imp == TIPC_SYSTEM_IMPORTANCE) { | |
907 | pr_warn("%s<%s>, link overflow", link_rst_msg, l->name); | |
908 | return -ENOBUFS; | |
909 | } | |
910 | rc = link_schedule_user(l, hdr); | |
911 | } | |
912 | ||
95901122 JPM |
913 | if (pkt_cnt > 1) { |
914 | l->stats.sent_fragmented++; | |
915 | l->stats.sent_fragments += pkt_cnt; | |
916 | } | |
917 | ||
af9b028e JPM |
918 | /* Prepare each packet for sending, and add to relevant queue: */ |
919 | while (skb_queue_len(list)) { | |
920 | skb = skb_peek(list); | |
921 | hdr = buf_msg(skb); | |
922 | msg_set_seqno(hdr, seqno); | |
923 | msg_set_ack(hdr, ack); | |
52666986 | 924 | msg_set_bcast_ack(hdr, bc_ack); |
af9b028e JPM |
925 | |
926 | if (likely(skb_queue_len(transmq) < maxwin)) { | |
927 | _skb = skb_clone(skb, GFP_ATOMIC); | |
4952cd3e RA |
928 | if (!_skb) { |
929 | skb_queue_purge(list); | |
af9b028e | 930 | return -ENOBUFS; |
4952cd3e | 931 | } |
af9b028e JPM |
932 | __skb_dequeue(list); |
933 | __skb_queue_tail(transmq, skb); | |
934 | __skb_queue_tail(xmitq, _skb); | |
c1ab3f1d | 935 | TIPC_SKB_CB(skb)->ackers = l->ackers; |
af9b028e | 936 | l->rcv_unacked = 0; |
95901122 | 937 | l->stats.sent_pkts++; |
af9b028e JPM |
938 | seqno++; |
939 | continue; | |
940 | } | |
b71ea3cd TL |
941 | tskb = &l->backlog[imp].target_bskb; |
942 | if (tipc_msg_bundle(*tskb, hdr, mtu)) { | |
af9b028e JPM |
943 | kfree_skb(__skb_dequeue(list)); |
944 | l->stats.sent_bundled++; | |
945 | continue; | |
946 | } | |
b71ea3cd | 947 | if (tipc_msg_make_bundle(tskb, hdr, mtu, l->addr)) { |
af9b028e | 948 | kfree_skb(__skb_dequeue(list)); |
b71ea3cd TL |
949 | __skb_queue_tail(backlogq, *tskb); |
950 | l->backlog[imp].len++; | |
af9b028e JPM |
951 | l->stats.sent_bundled++; |
952 | l->stats.sent_bundles++; | |
953 | continue; | |
954 | } | |
b71ea3cd | 955 | l->backlog[imp].target_bskb = NULL; |
af9b028e JPM |
956 | l->backlog[imp].len += skb_queue_len(list); |
957 | skb_queue_splice_tail_init(list, backlogq); | |
958 | } | |
959 | l->snd_nxt = seqno; | |
365ad353 | 960 | return rc; |
af9b028e JPM |
961 | } |
962 | ||
d999297c JPM |
963 | void tipc_link_advance_backlog(struct tipc_link *l, struct sk_buff_head *xmitq) |
964 | { | |
965 | struct sk_buff *skb, *_skb; | |
966 | struct tipc_msg *hdr; | |
967 | u16 seqno = l->snd_nxt; | |
968 | u16 ack = l->rcv_nxt - 1; | |
52666986 | 969 | u16 bc_ack = l->bc_rcvlink->rcv_nxt - 1; |
b71ea3cd | 970 | u32 imp; |
d999297c JPM |
971 | |
972 | while (skb_queue_len(&l->transmq) < l->window) { | |
973 | skb = skb_peek(&l->backlogq); | |
974 | if (!skb) | |
975 | break; | |
976 | _skb = skb_clone(skb, GFP_ATOMIC); | |
977 | if (!_skb) | |
978 | break; | |
979 | __skb_dequeue(&l->backlogq); | |
980 | hdr = buf_msg(skb); | |
b71ea3cd TL |
981 | imp = msg_importance(hdr); |
982 | l->backlog[imp].len--; | |
983 | if (unlikely(skb == l->backlog[imp].target_bskb)) | |
984 | l->backlog[imp].target_bskb = NULL; | |
d999297c JPM |
985 | __skb_queue_tail(&l->transmq, skb); |
986 | __skb_queue_tail(xmitq, _skb); | |
c1ab3f1d | 987 | TIPC_SKB_CB(skb)->ackers = l->ackers; |
d999297c | 988 | msg_set_seqno(hdr, seqno); |
52666986 JPM |
989 | msg_set_ack(hdr, ack); |
990 | msg_set_bcast_ack(hdr, bc_ack); | |
d999297c | 991 | l->rcv_unacked = 0; |
95901122 | 992 | l->stats.sent_pkts++; |
d999297c JPM |
993 | seqno++; |
994 | } | |
995 | l->snd_nxt = seqno; | |
996 | } | |
997 | ||
52666986 | 998 | static void link_retransmit_failure(struct tipc_link *l, struct sk_buff *skb) |
d356eeba | 999 | { |
52666986 JPM |
1000 | struct tipc_msg *hdr = buf_msg(skb); |
1001 | ||
1002 | pr_warn("Retransmission failure on link <%s>\n", l->name); | |
40501f90 | 1003 | link_print(l, "State of link "); |
52666986 JPM |
1004 | pr_info("Failed msg: usr %u, typ %u, len %u, err %u\n", |
1005 | msg_user(hdr), msg_type(hdr), msg_size(hdr), msg_errcode(hdr)); | |
1006 | pr_info("sqno %u, prev: %x, src: %x\n", | |
1007 | msg_seqno(hdr), msg_prevnode(hdr), msg_orignode(hdr)); | |
d356eeba AS |
1008 | } |
1009 | ||
40501f90 JPM |
1010 | int tipc_link_retrans(struct tipc_link *l, struct tipc_link *nacker, |
1011 | u16 from, u16 to, struct sk_buff_head *xmitq) | |
d999297c JPM |
1012 | { |
1013 | struct sk_buff *_skb, *skb = skb_peek(&l->transmq); | |
1014 | struct tipc_msg *hdr; | |
c1ab3f1d | 1015 | u16 ack = l->rcv_nxt - 1; |
52666986 | 1016 | u16 bc_ack = l->bc_rcvlink->rcv_nxt - 1; |
d999297c JPM |
1017 | |
1018 | if (!skb) | |
1019 | return 0; | |
1020 | ||
1021 | /* Detect repeated retransmit failures on same packet */ | |
40501f90 JPM |
1022 | if (nacker->last_retransm != buf_seqno(skb)) { |
1023 | nacker->last_retransm = buf_seqno(skb); | |
1024 | nacker->stale_count = 1; | |
1025 | } else if (++nacker->stale_count > 100) { | |
d999297c | 1026 | link_retransmit_failure(l, skb); |
40501f90 JPM |
1027 | nacker->stale_count = 0; |
1028 | if (link_is_bc_sndlink(l)) | |
1029 | return TIPC_LINK_DOWN_EVT; | |
662921cd | 1030 | return tipc_link_fsm_evt(l, LINK_FAILURE_EVT); |
d999297c | 1031 | } |
c1ab3f1d JPM |
1032 | |
1033 | /* Move forward to where retransmission should start */ | |
d999297c | 1034 | skb_queue_walk(&l->transmq, skb) { |
c1ab3f1d JPM |
1035 | if (!less(buf_seqno(skb), from)) |
1036 | break; | |
1037 | } | |
1038 | ||
1039 | skb_queue_walk_from(&l->transmq, skb) { | |
1040 | if (more(buf_seqno(skb), to)) | |
1041 | break; | |
d999297c JPM |
1042 | hdr = buf_msg(skb); |
1043 | _skb = __pskb_copy(skb, MIN_H_SIZE, GFP_ATOMIC); | |
1044 | if (!_skb) | |
1045 | return 0; | |
1046 | hdr = buf_msg(_skb); | |
c1ab3f1d JPM |
1047 | msg_set_ack(hdr, ack); |
1048 | msg_set_bcast_ack(hdr, bc_ack); | |
d999297c JPM |
1049 | _skb->priority = TC_PRIO_CONTROL; |
1050 | __skb_queue_tail(xmitq, _skb); | |
d999297c JPM |
1051 | l->stats.retransmitted++; |
1052 | } | |
1053 | return 0; | |
1054 | } | |
1055 | ||
c637c103 | 1056 | /* tipc_data_input - deliver data and name distr msgs to upper layer |
7ae934be | 1057 | * |
c637c103 | 1058 | * Consumes buffer if message is of right type |
7ae934be EH |
1059 | * Node lock must be held |
1060 | */ | |
52666986 | 1061 | static bool tipc_data_input(struct tipc_link *l, struct sk_buff *skb, |
9073fb8b | 1062 | struct sk_buff_head *inputq) |
7ae934be | 1063 | { |
399574d4 | 1064 | struct sk_buff_head *mc_inputq = l->bc_rcvlink->inputq; |
a853e4c6 JPM |
1065 | struct tipc_msg *hdr = buf_msg(skb); |
1066 | ||
1067 | switch (msg_user(hdr)) { | |
c637c103 JPM |
1068 | case TIPC_LOW_IMPORTANCE: |
1069 | case TIPC_MEDIUM_IMPORTANCE: | |
1070 | case TIPC_HIGH_IMPORTANCE: | |
1071 | case TIPC_CRITICAL_IMPORTANCE: | |
2f487712 | 1072 | if (unlikely(msg_in_group(hdr) || msg_mcast(hdr))) { |
399574d4 | 1073 | skb_queue_tail(mc_inputq, skb); |
a853e4c6 JPM |
1074 | return true; |
1075 | } | |
2f487712 | 1076 | case CONN_MANAGER: |
36c0a9df | 1077 | skb_queue_tail(inputq, skb); |
c637c103 | 1078 | return true; |
399574d4 JM |
1079 | case GROUP_PROTOCOL: |
1080 | skb_queue_tail(mc_inputq, skb); | |
1081 | return true; | |
7ae934be | 1082 | case NAME_DISTRIBUTOR: |
52666986 JPM |
1083 | l->bc_rcvlink->state = LINK_ESTABLISHED; |
1084 | skb_queue_tail(l->namedq, skb); | |
c637c103 JPM |
1085 | return true; |
1086 | case MSG_BUNDLER: | |
dff29b1a | 1087 | case TUNNEL_PROTOCOL: |
c637c103 | 1088 | case MSG_FRAGMENTER: |
7ae934be | 1089 | case BCAST_PROTOCOL: |
c637c103 | 1090 | return false; |
7ae934be | 1091 | default: |
c637c103 JPM |
1092 | pr_warn("Dropping received illegal msg type\n"); |
1093 | kfree_skb(skb); | |
234d1600 | 1094 | return true; |
c637c103 | 1095 | }; |
7ae934be | 1096 | } |
c637c103 JPM |
1097 | |
1098 | /* tipc_link_input - process packet that has passed link protocol check | |
1099 | * | |
1100 | * Consumes buffer | |
7ae934be | 1101 | */ |
9073fb8b JPM |
1102 | static int tipc_link_input(struct tipc_link *l, struct sk_buff *skb, |
1103 | struct sk_buff_head *inputq) | |
7ae934be | 1104 | { |
6e498158 JPM |
1105 | struct tipc_msg *hdr = buf_msg(skb); |
1106 | struct sk_buff **reasm_skb = &l->reasm_buf; | |
c637c103 | 1107 | struct sk_buff *iskb; |
9945e804 | 1108 | struct sk_buff_head tmpq; |
6e498158 | 1109 | int usr = msg_user(hdr); |
6144a996 | 1110 | int rc = 0; |
6e498158 JPM |
1111 | int pos = 0; |
1112 | int ipos = 0; | |
c637c103 | 1113 | |
6e498158 JPM |
1114 | if (unlikely(usr == TUNNEL_PROTOCOL)) { |
1115 | if (msg_type(hdr) == SYNCH_MSG) { | |
1116 | __skb_queue_purge(&l->deferdq); | |
1117 | goto drop; | |
8b4ed863 | 1118 | } |
6e498158 JPM |
1119 | if (!tipc_msg_extract(skb, &iskb, &ipos)) |
1120 | return rc; | |
1121 | kfree_skb(skb); | |
1122 | skb = iskb; | |
1123 | hdr = buf_msg(skb); | |
1124 | if (less(msg_seqno(hdr), l->drop_point)) | |
1125 | goto drop; | |
9073fb8b | 1126 | if (tipc_data_input(l, skb, inputq)) |
6e498158 JPM |
1127 | return rc; |
1128 | usr = msg_user(hdr); | |
1129 | reasm_skb = &l->failover_reasm_skb; | |
1130 | } | |
c637c103 | 1131 | |
6e498158 | 1132 | if (usr == MSG_BUNDLER) { |
9945e804 | 1133 | skb_queue_head_init(&tmpq); |
6e498158 JPM |
1134 | l->stats.recv_bundles++; |
1135 | l->stats.recv_bundled += msg_msgcnt(hdr); | |
c637c103 | 1136 | while (tipc_msg_extract(skb, &iskb, &pos)) |
9945e804 JPM |
1137 | tipc_data_input(l, iskb, &tmpq); |
1138 | tipc_skb_queue_splice_tail(&tmpq, inputq); | |
662921cd | 1139 | return 0; |
6e498158 JPM |
1140 | } else if (usr == MSG_FRAGMENTER) { |
1141 | l->stats.recv_fragments++; | |
1142 | if (tipc_buf_append(reasm_skb, &skb)) { | |
1143 | l->stats.recv_fragmented++; | |
9073fb8b | 1144 | tipc_data_input(l, skb, inputq); |
52666986 JPM |
1145 | } else if (!*reasm_skb && !link_is_bc_rcvlink(l)) { |
1146 | pr_warn_ratelimited("Unable to build fragment list\n"); | |
662921cd | 1147 | return tipc_link_fsm_evt(l, LINK_FAILURE_EVT); |
c637c103 | 1148 | } |
662921cd | 1149 | return 0; |
6e498158 | 1150 | } else if (usr == BCAST_PROTOCOL) { |
c72fa872 | 1151 | tipc_bcast_lock(l->net); |
52666986 | 1152 | tipc_link_bc_init_rcv(l->bc_rcvlink, hdr); |
c72fa872 | 1153 | tipc_bcast_unlock(l->net); |
6e498158 JPM |
1154 | } |
1155 | drop: | |
1156 | kfree_skb(skb); | |
662921cd | 1157 | return 0; |
7ae934be EH |
1158 | } |
1159 | ||
d999297c JPM |
1160 | static bool tipc_link_release_pkts(struct tipc_link *l, u16 acked) |
1161 | { | |
1162 | bool released = false; | |
1163 | struct sk_buff *skb, *tmp; | |
1164 | ||
1165 | skb_queue_walk_safe(&l->transmq, skb, tmp) { | |
1166 | if (more(buf_seqno(skb), acked)) | |
1167 | break; | |
1168 | __skb_unlink(skb, &l->transmq); | |
1169 | kfree_skb(skb); | |
1170 | released = true; | |
1171 | } | |
1172 | return released; | |
1173 | } | |
1174 | ||
34b9cd64 | 1175 | /* tipc_link_build_state_msg: prepare link state message for transmission |
52666986 JPM |
1176 | * |
1177 | * Note that sending of broadcast ack is coordinated among nodes, to reduce | |
1178 | * risk of ack storms towards the sender | |
f9aa358a | 1179 | */ |
34b9cd64 | 1180 | int tipc_link_build_state_msg(struct tipc_link *l, struct sk_buff_head *xmitq) |
f9aa358a | 1181 | { |
52666986 JPM |
1182 | if (!l) |
1183 | return 0; | |
1184 | ||
1185 | /* Broadcast ACK must be sent via a unicast link => defer to caller */ | |
1186 | if (link_is_bc_rcvlink(l)) { | |
e74a386d | 1187 | if (((l->rcv_nxt ^ tipc_own_addr(l->net)) & 0xf) != 0xf) |
52666986 JPM |
1188 | return 0; |
1189 | l->rcv_unacked = 0; | |
02d11ca2 JPM |
1190 | |
1191 | /* Use snd_nxt to store peer's snd_nxt in broadcast rcv link */ | |
1192 | l->snd_nxt = l->rcv_nxt; | |
1193 | return TIPC_LINK_SND_STATE; | |
52666986 JPM |
1194 | } |
1195 | ||
1196 | /* Unicast ACK */ | |
f9aa358a JPM |
1197 | l->rcv_unacked = 0; |
1198 | l->stats.sent_acks++; | |
8d6e79d3 | 1199 | tipc_link_build_proto_msg(l, STATE_MSG, 0, 0, 0, 0, 0, xmitq); |
52666986 | 1200 | return 0; |
f9aa358a JPM |
1201 | } |
1202 | ||
282b3a05 JPM |
1203 | /* tipc_link_build_reset_msg: prepare link RESET or ACTIVATE message |
1204 | */ | |
1205 | void tipc_link_build_reset_msg(struct tipc_link *l, struct sk_buff_head *xmitq) | |
1206 | { | |
1207 | int mtyp = RESET_MSG; | |
634696b1 | 1208 | struct sk_buff *skb; |
282b3a05 JPM |
1209 | |
1210 | if (l->state == LINK_ESTABLISHING) | |
1211 | mtyp = ACTIVATE_MSG; | |
1212 | ||
8d6e79d3 | 1213 | tipc_link_build_proto_msg(l, mtyp, 0, 0, 0, 0, 0, xmitq); |
634696b1 JPM |
1214 | |
1215 | /* Inform peer that this endpoint is going down if applicable */ | |
1216 | skb = skb_peek_tail(xmitq); | |
1217 | if (skb && (l->state == LINK_RESET)) | |
1218 | msg_set_peer_stopping(buf_msg(skb), 1); | |
282b3a05 JPM |
1219 | } |
1220 | ||
f9aa358a | 1221 | /* tipc_link_build_nack_msg: prepare link nack message for transmission |
e0a05ebe JPM |
1222 | * Note that sending of broadcast NACK is coordinated among nodes, to |
1223 | * reduce the risk of NACK storms towards the sender | |
f9aa358a | 1224 | */ |
e0a05ebe JPM |
1225 | static int tipc_link_build_nack_msg(struct tipc_link *l, |
1226 | struct sk_buff_head *xmitq) | |
f9aa358a JPM |
1227 | { |
1228 | u32 def_cnt = ++l->stats.deferred_recv; | |
e0a05ebe | 1229 | int match1, match2; |
f9aa358a | 1230 | |
e0a05ebe JPM |
1231 | if (link_is_bc_rcvlink(l)) { |
1232 | match1 = def_cnt & 0xf; | |
1233 | match2 = tipc_own_addr(l->net) & 0xf; | |
1234 | if (match1 == match2) | |
1235 | return TIPC_LINK_SND_STATE; | |
1236 | return 0; | |
1237 | } | |
52666986 | 1238 | |
f9aa358a | 1239 | if ((skb_queue_len(&l->deferdq) == 1) || !(def_cnt % TIPC_NACK_INTV)) |
8d6e79d3 | 1240 | tipc_link_build_proto_msg(l, STATE_MSG, 0, 0, 0, 0, 0, xmitq); |
e0a05ebe | 1241 | return 0; |
f9aa358a JPM |
1242 | } |
1243 | ||
d999297c | 1244 | /* tipc_link_rcv - process TIPC packets/messages arriving from off-node |
f9aa358a | 1245 | * @l: the link that should handle the message |
d999297c JPM |
1246 | * @skb: TIPC packet |
1247 | * @xmitq: queue to place packets to be sent after this call | |
1248 | */ | |
1249 | int tipc_link_rcv(struct tipc_link *l, struct sk_buff *skb, | |
1250 | struct sk_buff_head *xmitq) | |
1251 | { | |
f9aa358a | 1252 | struct sk_buff_head *defq = &l->deferdq; |
d999297c | 1253 | struct tipc_msg *hdr; |
81204c49 | 1254 | u16 seqno, rcv_nxt, win_lim; |
d999297c JPM |
1255 | int rc = 0; |
1256 | ||
f9aa358a | 1257 | do { |
d999297c | 1258 | hdr = buf_msg(skb); |
f9aa358a JPM |
1259 | seqno = msg_seqno(hdr); |
1260 | rcv_nxt = l->rcv_nxt; | |
81204c49 | 1261 | win_lim = rcv_nxt + TIPC_MAX_LINK_WIN; |
d999297c JPM |
1262 | |
1263 | /* Verify and update link state */ | |
f9aa358a JPM |
1264 | if (unlikely(msg_user(hdr) == LINK_PROTOCOL)) |
1265 | return tipc_link_proto_rcv(l, skb, xmitq); | |
d999297c | 1266 | |
662921cd | 1267 | if (unlikely(!link_is_up(l))) { |
73f646ce JPM |
1268 | if (l->state == LINK_ESTABLISHING) |
1269 | rc = TIPC_LINK_UP_EVT; | |
1270 | goto drop; | |
d999297c JPM |
1271 | } |
1272 | ||
f9aa358a | 1273 | /* Don't send probe at next timeout expiration */ |
d999297c JPM |
1274 | l->silent_intv_cnt = 0; |
1275 | ||
81204c49 JPM |
1276 | /* Drop if outside receive window */ |
1277 | if (unlikely(less(seqno, rcv_nxt) || more(seqno, win_lim))) { | |
1278 | l->stats.duplicates++; | |
1279 | goto drop; | |
1280 | } | |
1281 | ||
d999297c JPM |
1282 | /* Forward queues and wake up waiting users */ |
1283 | if (likely(tipc_link_release_pkts(l, msg_ack(hdr)))) { | |
1284 | tipc_link_advance_backlog(l, xmitq); | |
1285 | if (unlikely(!skb_queue_empty(&l->wakeupq))) | |
1286 | link_prepare_wakeup(l); | |
1287 | } | |
1288 | ||
81204c49 JPM |
1289 | /* Defer delivery if sequence gap */ |
1290 | if (unlikely(seqno != rcv_nxt)) { | |
8306f99a | 1291 | __tipc_skb_queue_sorted(defq, seqno, skb); |
e0a05ebe | 1292 | rc |= tipc_link_build_nack_msg(l, xmitq); |
f9aa358a | 1293 | break; |
d999297c JPM |
1294 | } |
1295 | ||
81204c49 | 1296 | /* Deliver packet */ |
d999297c | 1297 | l->rcv_nxt++; |
95901122 | 1298 | l->stats.recv_pkts++; |
f9aa358a | 1299 | if (!tipc_data_input(l, skb, l->inputq)) |
52666986 | 1300 | rc |= tipc_link_input(l, skb, l->inputq); |
f9aa358a | 1301 | if (unlikely(++l->rcv_unacked >= TIPC_MIN_LINK_WIN)) |
34b9cd64 | 1302 | rc |= tipc_link_build_state_msg(l, xmitq); |
02d11ca2 | 1303 | if (unlikely(rc & ~TIPC_LINK_SND_STATE)) |
52666986 | 1304 | break; |
f9aa358a JPM |
1305 | } while ((skb = __skb_dequeue(defq))); |
1306 | ||
1307 | return rc; | |
1308 | drop: | |
1309 | kfree_skb(skb); | |
d999297c JPM |
1310 | return rc; |
1311 | } | |
1312 | ||
426cc2b8 | 1313 | static void tipc_link_build_proto_msg(struct tipc_link *l, int mtyp, bool probe, |
8d6e79d3 JM |
1314 | bool probe_reply, u16 rcvgap, |
1315 | int tolerance, int priority, | |
426cc2b8 JPM |
1316 | struct sk_buff_head *xmitq) |
1317 | { | |
02d11ca2 | 1318 | struct tipc_link *bcl = l->bc_rcvlink; |
e74a386d JPM |
1319 | struct sk_buff *skb; |
1320 | struct tipc_msg *hdr; | |
1321 | struct sk_buff_head *dfq = &l->deferdq; | |
02d11ca2 | 1322 | bool node_up = link_is_up(bcl); |
35c55c98 JPM |
1323 | struct tipc_mon_state *mstate = &l->mon_state; |
1324 | int dlen = 0; | |
1325 | void *data; | |
426cc2b8 JPM |
1326 | |
1327 | /* Don't send protocol message during reset or link failover */ | |
662921cd | 1328 | if (tipc_link_is_blocked(l)) |
426cc2b8 JPM |
1329 | return; |
1330 | ||
e74a386d JPM |
1331 | if (!tipc_link_is_up(l) && (mtyp == STATE_MSG)) |
1332 | return; | |
1333 | ||
1334 | if (!skb_queue_empty(dfq)) | |
1335 | rcvgap = buf_seqno(skb_peek(dfq)) - l->rcv_nxt; | |
1336 | ||
1337 | skb = tipc_msg_create(LINK_PROTOCOL, mtyp, INT_H_SIZE, | |
35c55c98 | 1338 | tipc_max_domain_size, l->addr, |
e74a386d JPM |
1339 | tipc_own_addr(l->net), 0, 0, 0); |
1340 | if (!skb) | |
1341 | return; | |
1342 | ||
1343 | hdr = buf_msg(skb); | |
35c55c98 | 1344 | data = msg_data(hdr); |
e74a386d JPM |
1345 | msg_set_session(hdr, l->session); |
1346 | msg_set_bearer_id(hdr, l->bearer_id); | |
426cc2b8 | 1347 | msg_set_net_plane(hdr, l->net_plane); |
52666986 JPM |
1348 | msg_set_next_sent(hdr, l->snd_nxt); |
1349 | msg_set_ack(hdr, l->rcv_nxt - 1); | |
02d11ca2 | 1350 | msg_set_bcast_ack(hdr, bcl->rcv_nxt - 1); |
06bd2b1e | 1351 | msg_set_bc_ack_invalid(hdr, !node_up); |
52666986 | 1352 | msg_set_last_bcast(hdr, l->bc_sndlink->snd_nxt - 1); |
426cc2b8 JPM |
1353 | msg_set_link_tolerance(hdr, tolerance); |
1354 | msg_set_linkprio(hdr, priority); | |
1355 | msg_set_redundant_link(hdr, node_up); | |
1356 | msg_set_seq_gap(hdr, 0); | |
52666986 | 1357 | msg_set_seqno(hdr, l->snd_nxt + U16_MAX / 2); |
426cc2b8 JPM |
1358 | |
1359 | if (mtyp == STATE_MSG) { | |
e74a386d | 1360 | msg_set_seq_gap(hdr, rcvgap); |
02d11ca2 | 1361 | msg_set_bc_gap(hdr, link_bc_rcv_gap(bcl)); |
426cc2b8 | 1362 | msg_set_probe(hdr, probe); |
8d6e79d3 | 1363 | msg_set_is_keepalive(hdr, probe || probe_reply); |
35c55c98 JPM |
1364 | tipc_mon_prep(l->net, data, &dlen, mstate, l->bearer_id); |
1365 | msg_set_size(hdr, INT_H_SIZE + dlen); | |
1366 | skb_trim(skb, INT_H_SIZE + dlen); | |
426cc2b8 | 1367 | l->stats.sent_states++; |
52666986 | 1368 | l->rcv_unacked = 0; |
426cc2b8 JPM |
1369 | } else { |
1370 | /* RESET_MSG or ACTIVATE_MSG */ | |
1371 | msg_set_max_pkt(hdr, l->advertised_mtu); | |
35c55c98 JPM |
1372 | strcpy(data, l->if_name); |
1373 | msg_set_size(hdr, INT_H_SIZE + TIPC_MAX_IF_NAME); | |
1374 | skb_trim(skb, INT_H_SIZE + TIPC_MAX_IF_NAME); | |
426cc2b8 | 1375 | } |
e74a386d JPM |
1376 | if (probe) |
1377 | l->stats.sent_probes++; | |
1378 | if (rcvgap) | |
1379 | l->stats.sent_nacks++; | |
426cc2b8 | 1380 | skb->priority = TC_PRIO_CONTROL; |
6e498158 | 1381 | __skb_queue_tail(xmitq, skb); |
b97bf3fd PL |
1382 | } |
1383 | ||
6e498158 | 1384 | /* tipc_link_tnl_prepare(): prepare and return a list of tunnel packets |
f9aa358a | 1385 | * with contents of the link's transmit and backlog queues. |
b97bf3fd | 1386 | */ |
6e498158 JPM |
1387 | void tipc_link_tnl_prepare(struct tipc_link *l, struct tipc_link *tnl, |
1388 | int mtyp, struct sk_buff_head *xmitq) | |
b97bf3fd | 1389 | { |
6e498158 JPM |
1390 | struct sk_buff *skb, *tnlskb; |
1391 | struct tipc_msg *hdr, tnlhdr; | |
1392 | struct sk_buff_head *queue = &l->transmq; | |
1393 | struct sk_buff_head tmpxq, tnlq; | |
1394 | u16 pktlen, pktcnt, seqno = l->snd_nxt; | |
b97bf3fd | 1395 | |
6e498158 | 1396 | if (!tnl) |
b97bf3fd PL |
1397 | return; |
1398 | ||
6e498158 JPM |
1399 | skb_queue_head_init(&tnlq); |
1400 | skb_queue_head_init(&tmpxq); | |
dd3f9e70 | 1401 | |
6e498158 JPM |
1402 | /* At least one packet required for safe algorithm => add dummy */ |
1403 | skb = tipc_msg_create(TIPC_LOW_IMPORTANCE, TIPC_DIRECT_MSG, | |
e74a386d | 1404 | BASIC_H_SIZE, 0, l->addr, tipc_own_addr(l->net), |
6e498158 JPM |
1405 | 0, 0, TIPC_ERR_NO_PORT); |
1406 | if (!skb) { | |
1407 | pr_warn("%sunable to create tunnel packet\n", link_co_err); | |
b97bf3fd PL |
1408 | return; |
1409 | } | |
6e498158 JPM |
1410 | skb_queue_tail(&tnlq, skb); |
1411 | tipc_link_xmit(l, &tnlq, &tmpxq); | |
1412 | __skb_queue_purge(&tmpxq); | |
1413 | ||
1414 | /* Initialize reusable tunnel packet header */ | |
e74a386d | 1415 | tipc_msg_init(tipc_own_addr(l->net), &tnlhdr, TUNNEL_PROTOCOL, |
6e498158 JPM |
1416 | mtyp, INT_H_SIZE, l->addr); |
1417 | pktcnt = skb_queue_len(&l->transmq) + skb_queue_len(&l->backlogq); | |
1418 | msg_set_msgcnt(&tnlhdr, pktcnt); | |
1419 | msg_set_bearer_id(&tnlhdr, l->peer_bearer_id); | |
1420 | tnl: | |
1421 | /* Wrap each packet into a tunnel packet */ | |
05dcc5aa | 1422 | skb_queue_walk(queue, skb) { |
6e498158 JPM |
1423 | hdr = buf_msg(skb); |
1424 | if (queue == &l->backlogq) | |
1425 | msg_set_seqno(hdr, seqno++); | |
1426 | pktlen = msg_size(hdr); | |
1427 | msg_set_size(&tnlhdr, pktlen + INT_H_SIZE); | |
57d5f64d | 1428 | tnlskb = tipc_buf_acquire(pktlen + INT_H_SIZE, GFP_ATOMIC); |
6e498158 JPM |
1429 | if (!tnlskb) { |
1430 | pr_warn("%sunable to send packet\n", link_co_err); | |
b97bf3fd PL |
1431 | return; |
1432 | } | |
6e498158 JPM |
1433 | skb_copy_to_linear_data(tnlskb, &tnlhdr, INT_H_SIZE); |
1434 | skb_copy_to_linear_data_offset(tnlskb, INT_H_SIZE, hdr, pktlen); | |
1435 | __skb_queue_tail(&tnlq, tnlskb); | |
b97bf3fd | 1436 | } |
6e498158 JPM |
1437 | if (queue != &l->backlogq) { |
1438 | queue = &l->backlogq; | |
1439 | goto tnl; | |
f006c9c7 | 1440 | } |
1dab3d5a | 1441 | |
6e498158 | 1442 | tipc_link_xmit(tnl, &tnlq, xmitq); |
b97bf3fd | 1443 | |
6e498158 JPM |
1444 | if (mtyp == FAILOVER_MSG) { |
1445 | tnl->drop_point = l->rcv_nxt; | |
1446 | tnl->failover_reasm_skb = l->reasm_buf; | |
1447 | l->reasm_buf = NULL; | |
2da71425 | 1448 | } |
b97bf3fd PL |
1449 | } |
1450 | ||
d999297c JPM |
1451 | /* tipc_link_proto_rcv(): receive link level protocol message : |
1452 | * Note that network plane id propagates through the network, and may | |
1453 | * change at any time. The node with lowest numerical id determines | |
1454 | * network plane | |
1455 | */ | |
1456 | static int tipc_link_proto_rcv(struct tipc_link *l, struct sk_buff *skb, | |
1457 | struct sk_buff_head *xmitq) | |
1458 | { | |
1459 | struct tipc_msg *hdr = buf_msg(skb); | |
1460 | u16 rcvgap = 0; | |
c1ab3f1d JPM |
1461 | u16 ack = msg_ack(hdr); |
1462 | u16 gap = msg_seq_gap(hdr); | |
d999297c JPM |
1463 | u16 peers_snd_nxt = msg_next_sent(hdr); |
1464 | u16 peers_tol = msg_link_tolerance(hdr); | |
1465 | u16 peers_prio = msg_linkprio(hdr); | |
2be80c2d | 1466 | u16 rcv_nxt = l->rcv_nxt; |
35c55c98 | 1467 | u16 dlen = msg_data_sz(hdr); |
73f646ce | 1468 | int mtyp = msg_type(hdr); |
8d6e79d3 | 1469 | bool reply = msg_probe(hdr); |
35c55c98 | 1470 | void *data; |
d999297c JPM |
1471 | char *if_name; |
1472 | int rc = 0; | |
1473 | ||
52666986 | 1474 | if (tipc_link_is_blocked(l) || !xmitq) |
d999297c JPM |
1475 | goto exit; |
1476 | ||
e74a386d | 1477 | if (tipc_own_addr(l->net) > msg_prevnode(hdr)) |
d999297c JPM |
1478 | l->net_plane = msg_net_plane(hdr); |
1479 | ||
35c55c98 JPM |
1480 | skb_linearize(skb); |
1481 | hdr = buf_msg(skb); | |
1482 | data = msg_data(hdr); | |
1483 | ||
73f646ce | 1484 | switch (mtyp) { |
d999297c JPM |
1485 | case RESET_MSG: |
1486 | ||
1487 | /* Ignore duplicate RESET with old session number */ | |
1488 | if ((less_eq(msg_session(hdr), l->peer_session)) && | |
e74a386d | 1489 | (l->peer_session != ANY_SESSION)) |
d999297c JPM |
1490 | break; |
1491 | /* fall thru' */ | |
662921cd | 1492 | |
d999297c JPM |
1493 | case ACTIVATE_MSG: |
1494 | ||
1495 | /* Complete own link name with peer's interface name */ | |
1496 | if_name = strrchr(l->name, ':') + 1; | |
1497 | if (sizeof(l->name) - (if_name - l->name) <= TIPC_MAX_IF_NAME) | |
1498 | break; | |
1499 | if (msg_data_sz(hdr) < TIPC_MAX_IF_NAME) | |
1500 | break; | |
35c55c98 | 1501 | strncpy(if_name, data, TIPC_MAX_IF_NAME); |
d999297c JPM |
1502 | |
1503 | /* Update own tolerance if peer indicates a non-zero value */ | |
1504 | if (in_range(peers_tol, TIPC_MIN_LINK_TOL, TIPC_MAX_LINK_TOL)) | |
1505 | l->tolerance = peers_tol; | |
1506 | ||
1507 | /* Update own priority if peer's priority is higher */ | |
1508 | if (in_range(peers_prio, l->priority + 1, TIPC_MAX_LINK_PRI)) | |
1509 | l->priority = peers_prio; | |
1510 | ||
cd898b2d JM |
1511 | /* If peer is going down we want full re-establish cycle */ |
1512 | if (msg_peer_stopping(hdr)) { | |
634696b1 | 1513 | rc = tipc_link_fsm_evt(l, LINK_FAILURE_EVT); |
cd898b2d JM |
1514 | break; |
1515 | } | |
1516 | /* ACTIVATE_MSG serves as PEER_RESET if link is already down */ | |
1517 | if (mtyp == RESET_MSG || !link_is_up(l)) | |
73f646ce JPM |
1518 | rc = tipc_link_fsm_evt(l, LINK_PEER_RESET_EVT); |
1519 | ||
1520 | /* ACTIVATE_MSG takes up link if it was already locally reset */ | |
cd898b2d | 1521 | if (mtyp == ACTIVATE_MSG && l->state == LINK_ESTABLISHING) |
73f646ce JPM |
1522 | rc = TIPC_LINK_UP_EVT; |
1523 | ||
d999297c JPM |
1524 | l->peer_session = msg_session(hdr); |
1525 | l->peer_bearer_id = msg_bearer_id(hdr); | |
d999297c JPM |
1526 | if (l->mtu > msg_max_pkt(hdr)) |
1527 | l->mtu = msg_max_pkt(hdr); | |
1528 | break; | |
662921cd | 1529 | |
d999297c | 1530 | case STATE_MSG: |
662921cd | 1531 | |
d999297c JPM |
1532 | /* Update own tolerance if peer indicates a non-zero value */ |
1533 | if (in_range(peers_tol, TIPC_MIN_LINK_TOL, TIPC_MAX_LINK_TOL)) | |
1534 | l->tolerance = peers_tol; | |
1535 | ||
f7967556 JPM |
1536 | /* Update own prio if peer indicates a different value */ |
1537 | if ((peers_prio != l->priority) && | |
1538 | in_range(peers_prio, 1, TIPC_MAX_LINK_PRI)) { | |
81729810 RA |
1539 | l->priority = peers_prio; |
1540 | rc = tipc_link_fsm_evt(l, LINK_FAILURE_EVT); | |
1541 | } | |
1542 | ||
d999297c JPM |
1543 | l->silent_intv_cnt = 0; |
1544 | l->stats.recv_states++; | |
1545 | if (msg_probe(hdr)) | |
1546 | l->stats.recv_probes++; | |
73f646ce JPM |
1547 | |
1548 | if (!link_is_up(l)) { | |
1549 | if (l->state == LINK_ESTABLISHING) | |
1550 | rc = TIPC_LINK_UP_EVT; | |
d999297c | 1551 | break; |
73f646ce | 1552 | } |
35c55c98 JPM |
1553 | tipc_mon_rcv(l->net, data, dlen, l->addr, |
1554 | &l->mon_state, l->bearer_id); | |
d999297c | 1555 | |
662921cd | 1556 | /* Send NACK if peer has sent pkts we haven't received yet */ |
2be80c2d | 1557 | if (more(peers_snd_nxt, rcv_nxt) && !tipc_link_is_synching(l)) |
d999297c | 1558 | rcvgap = peers_snd_nxt - l->rcv_nxt; |
8d6e79d3 JM |
1559 | if (rcvgap || reply) |
1560 | tipc_link_build_proto_msg(l, STATE_MSG, 0, reply, | |
1561 | rcvgap, 0, 0, xmitq); | |
c1ab3f1d | 1562 | tipc_link_release_pkts(l, ack); |
d999297c JPM |
1563 | |
1564 | /* If NACK, retransmit will now start at right position */ | |
c1ab3f1d | 1565 | if (gap) { |
40501f90 | 1566 | rc = tipc_link_retrans(l, l, ack + 1, ack + gap, xmitq); |
d999297c JPM |
1567 | l->stats.recv_nacks++; |
1568 | } | |
662921cd | 1569 | |
d999297c JPM |
1570 | tipc_link_advance_backlog(l, xmitq); |
1571 | if (unlikely(!skb_queue_empty(&l->wakeupq))) | |
1572 | link_prepare_wakeup(l); | |
1573 | } | |
1574 | exit: | |
1575 | kfree_skb(skb); | |
1576 | return rc; | |
1577 | } | |
1578 | ||
52666986 JPM |
1579 | /* tipc_link_build_bc_proto_msg() - create broadcast protocol message |
1580 | */ | |
1581 | static bool tipc_link_build_bc_proto_msg(struct tipc_link *l, bool bcast, | |
1582 | u16 peers_snd_nxt, | |
1583 | struct sk_buff_head *xmitq) | |
1584 | { | |
1585 | struct sk_buff *skb; | |
1586 | struct tipc_msg *hdr; | |
1587 | struct sk_buff *dfrd_skb = skb_peek(&l->deferdq); | |
1588 | u16 ack = l->rcv_nxt - 1; | |
1589 | u16 gap_to = peers_snd_nxt - 1; | |
1590 | ||
1591 | skb = tipc_msg_create(BCAST_PROTOCOL, STATE_MSG, INT_H_SIZE, | |
e74a386d | 1592 | 0, l->addr, tipc_own_addr(l->net), 0, 0, 0); |
52666986 JPM |
1593 | if (!skb) |
1594 | return false; | |
1595 | hdr = buf_msg(skb); | |
1596 | msg_set_last_bcast(hdr, l->bc_sndlink->snd_nxt - 1); | |
1597 | msg_set_bcast_ack(hdr, ack); | |
1598 | msg_set_bcgap_after(hdr, ack); | |
1599 | if (dfrd_skb) | |
1600 | gap_to = buf_seqno(dfrd_skb) - 1; | |
1601 | msg_set_bcgap_to(hdr, gap_to); | |
1602 | msg_set_non_seq(hdr, bcast); | |
1603 | __skb_queue_tail(xmitq, skb); | |
1604 | return true; | |
1605 | } | |
1606 | ||
1607 | /* tipc_link_build_bc_init_msg() - synchronize broadcast link endpoints. | |
1608 | * | |
1609 | * Give a newly added peer node the sequence number where it should | |
1610 | * start receiving and acking broadcast packets. | |
1611 | */ | |
742e0383 WF |
1612 | static void tipc_link_build_bc_init_msg(struct tipc_link *l, |
1613 | struct sk_buff_head *xmitq) | |
52666986 JPM |
1614 | { |
1615 | struct sk_buff_head list; | |
1616 | ||
1617 | __skb_queue_head_init(&list); | |
1618 | if (!tipc_link_build_bc_proto_msg(l->bc_rcvlink, false, 0, &list)) | |
1619 | return; | |
06bd2b1e | 1620 | msg_set_bc_ack_invalid(buf_msg(skb_peek(&list)), true); |
52666986 JPM |
1621 | tipc_link_xmit(l, &list, xmitq); |
1622 | } | |
1623 | ||
1624 | /* tipc_link_bc_init_rcv - receive initial broadcast synch data from peer | |
1625 | */ | |
1626 | void tipc_link_bc_init_rcv(struct tipc_link *l, struct tipc_msg *hdr) | |
1627 | { | |
1628 | int mtyp = msg_type(hdr); | |
1629 | u16 peers_snd_nxt = msg_bc_snd_nxt(hdr); | |
1630 | ||
1631 | if (link_is_up(l)) | |
1632 | return; | |
1633 | ||
1634 | if (msg_user(hdr) == BCAST_PROTOCOL) { | |
1635 | l->rcv_nxt = peers_snd_nxt; | |
1636 | l->state = LINK_ESTABLISHED; | |
1637 | return; | |
1638 | } | |
1639 | ||
1640 | if (l->peer_caps & TIPC_BCAST_SYNCH) | |
1641 | return; | |
1642 | ||
1643 | if (msg_peer_node_is_up(hdr)) | |
1644 | return; | |
1645 | ||
1646 | /* Compatibility: accept older, less safe initial synch data */ | |
1647 | if ((mtyp == RESET_MSG) || (mtyp == ACTIVATE_MSG)) | |
1648 | l->rcv_nxt = peers_snd_nxt; | |
1649 | } | |
1650 | ||
7c4a54b9 JPM |
1651 | /* link_bc_retr eval()- check if the indicated range can be retransmitted now |
1652 | * - Adjust permitted range if there is overlap with previous retransmission | |
1653 | */ | |
1654 | static bool link_bc_retr_eval(struct tipc_link *l, u16 *from, u16 *to) | |
1655 | { | |
1656 | unsigned long elapsed = jiffies_to_msecs(jiffies - l->prev_retr); | |
1657 | ||
1658 | if (less(*to, *from)) | |
1659 | return false; | |
1660 | ||
1661 | /* New retransmission request */ | |
1662 | if ((elapsed > TIPC_BC_RETR_LIMIT) || | |
1663 | less(*to, l->prev_from) || more(*from, l->prev_to)) { | |
1664 | l->prev_from = *from; | |
1665 | l->prev_to = *to; | |
1666 | l->prev_retr = jiffies; | |
1667 | return true; | |
1668 | } | |
1669 | ||
1670 | /* Inside range of previous retransmit */ | |
1671 | if (!less(*from, l->prev_from) && !more(*to, l->prev_to)) | |
1672 | return false; | |
1673 | ||
1674 | /* Fully or partially outside previous range => exclude overlap */ | |
1675 | if (less(*from, l->prev_from)) { | |
1676 | *to = l->prev_from - 1; | |
1677 | l->prev_from = *from; | |
1678 | } | |
1679 | if (more(*to, l->prev_to)) { | |
1680 | *from = l->prev_to + 1; | |
1681 | l->prev_to = *to; | |
1682 | } | |
1683 | l->prev_retr = jiffies; | |
1684 | return true; | |
1685 | } | |
1686 | ||
52666986 JPM |
1687 | /* tipc_link_bc_sync_rcv - update rcv link according to peer's send state |
1688 | */ | |
02d11ca2 JPM |
1689 | int tipc_link_bc_sync_rcv(struct tipc_link *l, struct tipc_msg *hdr, |
1690 | struct sk_buff_head *xmitq) | |
52666986 | 1691 | { |
7c4a54b9 | 1692 | struct tipc_link *snd_l = l->bc_sndlink; |
52666986 | 1693 | u16 peers_snd_nxt = msg_bc_snd_nxt(hdr); |
02d11ca2 JPM |
1694 | u16 from = msg_bcast_ack(hdr) + 1; |
1695 | u16 to = from + msg_bc_gap(hdr) - 1; | |
1696 | int rc = 0; | |
52666986 JPM |
1697 | |
1698 | if (!link_is_up(l)) | |
02d11ca2 | 1699 | return rc; |
52666986 JPM |
1700 | |
1701 | if (!msg_peer_node_is_up(hdr)) | |
02d11ca2 | 1702 | return rc; |
52666986 | 1703 | |
2d18ac4b JPM |
1704 | /* Open when peer ackowledges our bcast init msg (pkt #1) */ |
1705 | if (msg_ack(hdr)) | |
1706 | l->bc_peer_is_up = true; | |
1707 | ||
1708 | if (!l->bc_peer_is_up) | |
02d11ca2 | 1709 | return rc; |
52666986 | 1710 | |
7c4a54b9 JPM |
1711 | l->stats.recv_nacks++; |
1712 | ||
52666986 JPM |
1713 | /* Ignore if peers_snd_nxt goes beyond receive window */ |
1714 | if (more(peers_snd_nxt, l->rcv_nxt + l->window)) | |
02d11ca2 JPM |
1715 | return rc; |
1716 | ||
7c4a54b9 | 1717 | if (link_bc_retr_eval(snd_l, &from, &to)) |
40501f90 | 1718 | rc = tipc_link_retrans(snd_l, l, from, to, xmitq); |
02d11ca2 JPM |
1719 | |
1720 | l->snd_nxt = peers_snd_nxt; | |
1721 | if (link_bc_rcv_gap(l)) | |
1722 | rc |= TIPC_LINK_SND_STATE; | |
1723 | ||
1724 | /* Return now if sender supports nack via STATE messages */ | |
1725 | if (l->peer_caps & TIPC_BCAST_STATE_NACK) | |
1726 | return rc; | |
1727 | ||
1728 | /* Otherwise, be backwards compatible */ | |
52666986 JPM |
1729 | |
1730 | if (!more(peers_snd_nxt, l->rcv_nxt)) { | |
1731 | l->nack_state = BC_NACK_SND_CONDITIONAL; | |
02d11ca2 | 1732 | return 0; |
52666986 JPM |
1733 | } |
1734 | ||
1735 | /* Don't NACK if one was recently sent or peeked */ | |
1736 | if (l->nack_state == BC_NACK_SND_SUPPRESS) { | |
1737 | l->nack_state = BC_NACK_SND_UNCONDITIONAL; | |
02d11ca2 | 1738 | return 0; |
52666986 JPM |
1739 | } |
1740 | ||
1741 | /* Conditionally delay NACK sending until next synch rcv */ | |
1742 | if (l->nack_state == BC_NACK_SND_CONDITIONAL) { | |
1743 | l->nack_state = BC_NACK_SND_UNCONDITIONAL; | |
1744 | if ((peers_snd_nxt - l->rcv_nxt) < TIPC_MIN_LINK_WIN) | |
02d11ca2 | 1745 | return 0; |
52666986 JPM |
1746 | } |
1747 | ||
1748 | /* Send NACK now but suppress next one */ | |
1749 | tipc_link_build_bc_proto_msg(l, true, peers_snd_nxt, xmitq); | |
1750 | l->nack_state = BC_NACK_SND_SUPPRESS; | |
02d11ca2 | 1751 | return 0; |
52666986 JPM |
1752 | } |
1753 | ||
1754 | void tipc_link_bc_ack_rcv(struct tipc_link *l, u16 acked, | |
1755 | struct sk_buff_head *xmitq) | |
1756 | { | |
1757 | struct sk_buff *skb, *tmp; | |
1758 | struct tipc_link *snd_l = l->bc_sndlink; | |
1759 | ||
1760 | if (!link_is_up(l) || !l->bc_peer_is_up) | |
1761 | return; | |
1762 | ||
1763 | if (!more(acked, l->acked)) | |
1764 | return; | |
1765 | ||
1766 | /* Skip over packets peer has already acked */ | |
1767 | skb_queue_walk(&snd_l->transmq, skb) { | |
1768 | if (more(buf_seqno(skb), l->acked)) | |
1769 | break; | |
1770 | } | |
1771 | ||
1772 | /* Update/release the packets peer is acking now */ | |
1773 | skb_queue_walk_from_safe(&snd_l->transmq, skb, tmp) { | |
1774 | if (more(buf_seqno(skb), acked)) | |
1775 | break; | |
1776 | if (!--TIPC_SKB_CB(skb)->ackers) { | |
1777 | __skb_unlink(skb, &snd_l->transmq); | |
1778 | kfree_skb(skb); | |
1779 | } | |
1780 | } | |
1781 | l->acked = acked; | |
1782 | tipc_link_advance_backlog(snd_l, xmitq); | |
1783 | if (unlikely(!skb_queue_empty(&snd_l->wakeupq))) | |
1784 | link_prepare_wakeup(snd_l); | |
1785 | } | |
1786 | ||
1787 | /* tipc_link_bc_nack_rcv(): receive broadcast nack message | |
02d11ca2 JPM |
1788 | * This function is here for backwards compatibility, since |
1789 | * no BCAST_PROTOCOL/STATE messages occur from TIPC v2.5. | |
52666986 JPM |
1790 | */ |
1791 | int tipc_link_bc_nack_rcv(struct tipc_link *l, struct sk_buff *skb, | |
1792 | struct sk_buff_head *xmitq) | |
1793 | { | |
1794 | struct tipc_msg *hdr = buf_msg(skb); | |
1795 | u32 dnode = msg_destnode(hdr); | |
1796 | int mtyp = msg_type(hdr); | |
1797 | u16 acked = msg_bcast_ack(hdr); | |
1798 | u16 from = acked + 1; | |
1799 | u16 to = msg_bcgap_to(hdr); | |
1800 | u16 peers_snd_nxt = to + 1; | |
1801 | int rc = 0; | |
1802 | ||
1803 | kfree_skb(skb); | |
1804 | ||
1805 | if (!tipc_link_is_up(l) || !l->bc_peer_is_up) | |
1806 | return 0; | |
1807 | ||
1808 | if (mtyp != STATE_MSG) | |
1809 | return 0; | |
1810 | ||
e74a386d | 1811 | if (dnode == tipc_own_addr(l->net)) { |
52666986 | 1812 | tipc_link_bc_ack_rcv(l, acked, xmitq); |
40501f90 | 1813 | rc = tipc_link_retrans(l->bc_sndlink, l, from, to, xmitq); |
52666986 JPM |
1814 | l->stats.recv_nacks++; |
1815 | return rc; | |
1816 | } | |
1817 | ||
1818 | /* Msg for other node => suppress own NACK at next sync if applicable */ | |
1819 | if (more(peers_snd_nxt, l->rcv_nxt) && !less(l->rcv_nxt, from)) | |
1820 | l->nack_state = BC_NACK_SND_SUPPRESS; | |
1821 | ||
1822 | return 0; | |
1823 | } | |
1824 | ||
e3eea1eb | 1825 | void tipc_link_set_queue_limits(struct tipc_link *l, u32 win) |
b97bf3fd | 1826 | { |
ed193ece | 1827 | int max_bulk = TIPC_MAX_PUBLICATIONS / (l->mtu / ITEM_SIZE); |
e3eea1eb JPM |
1828 | |
1829 | l->window = win; | |
5a0950c2 JPM |
1830 | l->backlog[TIPC_LOW_IMPORTANCE].limit = max_t(u16, 50, win); |
1831 | l->backlog[TIPC_MEDIUM_IMPORTANCE].limit = max_t(u16, 100, win * 2); | |
1832 | l->backlog[TIPC_HIGH_IMPORTANCE].limit = max_t(u16, 150, win * 3); | |
1833 | l->backlog[TIPC_CRITICAL_IMPORTANCE].limit = max_t(u16, 200, win * 4); | |
1f66d161 | 1834 | l->backlog[TIPC_SYSTEM_IMPORTANCE].limit = max_bulk; |
b97bf3fd PL |
1835 | } |
1836 | ||
b97bf3fd | 1837 | /** |
38206d59 | 1838 | * link_reset_stats - reset link statistics |
1a90632d | 1839 | * @l: pointer to link |
b97bf3fd | 1840 | */ |
38206d59 | 1841 | void tipc_link_reset_stats(struct tipc_link *l) |
b97bf3fd | 1842 | { |
38206d59 | 1843 | memset(&l->stats, 0, sizeof(l->stats)); |
b97bf3fd PL |
1844 | } |
1845 | ||
1a20cc25 | 1846 | static void link_print(struct tipc_link *l, const char *str) |
b97bf3fd | 1847 | { |
1a20cc25 | 1848 | struct sk_buff *hskb = skb_peek(&l->transmq); |
c1ab3f1d | 1849 | u16 head = hskb ? msg_seqno(buf_msg(hskb)) : l->snd_nxt - 1; |
1a20cc25 | 1850 | u16 tail = l->snd_nxt - 1; |
7a2f7d18 | 1851 | |
662921cd | 1852 | pr_info("%s Link <%s> state %x\n", str, l->name, l->state); |
1a20cc25 JPM |
1853 | pr_info("XMTQ: %u [%u-%u], BKLGQ: %u, SNDNX: %u, RCVNX: %u\n", |
1854 | skb_queue_len(&l->transmq), head, tail, | |
1855 | skb_queue_len(&l->backlogq), l->snd_nxt, l->rcv_nxt); | |
b97bf3fd | 1856 | } |
0655f6a8 RA |
1857 | |
1858 | /* Parse and validate nested (link) properties valid for media, bearer and link | |
1859 | */ | |
1860 | int tipc_nl_parse_link_prop(struct nlattr *prop, struct nlattr *props[]) | |
1861 | { | |
1862 | int err; | |
1863 | ||
1864 | err = nla_parse_nested(props, TIPC_NLA_PROP_MAX, prop, | |
fceb6435 | 1865 | tipc_nl_prop_policy, NULL); |
0655f6a8 RA |
1866 | if (err) |
1867 | return err; | |
1868 | ||
1869 | if (props[TIPC_NLA_PROP_PRIO]) { | |
1870 | u32 prio; | |
1871 | ||
1872 | prio = nla_get_u32(props[TIPC_NLA_PROP_PRIO]); | |
1873 | if (prio > TIPC_MAX_LINK_PRI) | |
1874 | return -EINVAL; | |
1875 | } | |
1876 | ||
1877 | if (props[TIPC_NLA_PROP_TOL]) { | |
1878 | u32 tol; | |
1879 | ||
1880 | tol = nla_get_u32(props[TIPC_NLA_PROP_TOL]); | |
1881 | if ((tol < TIPC_MIN_LINK_TOL) || (tol > TIPC_MAX_LINK_TOL)) | |
1882 | return -EINVAL; | |
1883 | } | |
1884 | ||
1885 | if (props[TIPC_NLA_PROP_WIN]) { | |
1886 | u32 win; | |
1887 | ||
1888 | win = nla_get_u32(props[TIPC_NLA_PROP_WIN]); | |
1889 | if ((win < TIPC_MIN_LINK_WIN) || (win > TIPC_MAX_LINK_WIN)) | |
1890 | return -EINVAL; | |
1891 | } | |
1892 | ||
1893 | return 0; | |
1894 | } | |
7be57fc6 | 1895 | |
d8182804 | 1896 | static int __tipc_nl_add_stats(struct sk_buff *skb, struct tipc_stats *s) |
7be57fc6 RA |
1897 | { |
1898 | int i; | |
1899 | struct nlattr *stats; | |
1900 | ||
1901 | struct nla_map { | |
1902 | u32 key; | |
1903 | u32 val; | |
1904 | }; | |
1905 | ||
1906 | struct nla_map map[] = { | |
95901122 | 1907 | {TIPC_NLA_STATS_RX_INFO, 0}, |
7be57fc6 RA |
1908 | {TIPC_NLA_STATS_RX_FRAGMENTS, s->recv_fragments}, |
1909 | {TIPC_NLA_STATS_RX_FRAGMENTED, s->recv_fragmented}, | |
1910 | {TIPC_NLA_STATS_RX_BUNDLES, s->recv_bundles}, | |
1911 | {TIPC_NLA_STATS_RX_BUNDLED, s->recv_bundled}, | |
95901122 | 1912 | {TIPC_NLA_STATS_TX_INFO, 0}, |
7be57fc6 RA |
1913 | {TIPC_NLA_STATS_TX_FRAGMENTS, s->sent_fragments}, |
1914 | {TIPC_NLA_STATS_TX_FRAGMENTED, s->sent_fragmented}, | |
1915 | {TIPC_NLA_STATS_TX_BUNDLES, s->sent_bundles}, | |
1916 | {TIPC_NLA_STATS_TX_BUNDLED, s->sent_bundled}, | |
1917 | {TIPC_NLA_STATS_MSG_PROF_TOT, (s->msg_length_counts) ? | |
1918 | s->msg_length_counts : 1}, | |
1919 | {TIPC_NLA_STATS_MSG_LEN_CNT, s->msg_length_counts}, | |
1920 | {TIPC_NLA_STATS_MSG_LEN_TOT, s->msg_lengths_total}, | |
1921 | {TIPC_NLA_STATS_MSG_LEN_P0, s->msg_length_profile[0]}, | |
1922 | {TIPC_NLA_STATS_MSG_LEN_P1, s->msg_length_profile[1]}, | |
1923 | {TIPC_NLA_STATS_MSG_LEN_P2, s->msg_length_profile[2]}, | |
1924 | {TIPC_NLA_STATS_MSG_LEN_P3, s->msg_length_profile[3]}, | |
1925 | {TIPC_NLA_STATS_MSG_LEN_P4, s->msg_length_profile[4]}, | |
1926 | {TIPC_NLA_STATS_MSG_LEN_P5, s->msg_length_profile[5]}, | |
1927 | {TIPC_NLA_STATS_MSG_LEN_P6, s->msg_length_profile[6]}, | |
1928 | {TIPC_NLA_STATS_RX_STATES, s->recv_states}, | |
1929 | {TIPC_NLA_STATS_RX_PROBES, s->recv_probes}, | |
1930 | {TIPC_NLA_STATS_RX_NACKS, s->recv_nacks}, | |
1931 | {TIPC_NLA_STATS_RX_DEFERRED, s->deferred_recv}, | |
1932 | {TIPC_NLA_STATS_TX_STATES, s->sent_states}, | |
1933 | {TIPC_NLA_STATS_TX_PROBES, s->sent_probes}, | |
1934 | {TIPC_NLA_STATS_TX_NACKS, s->sent_nacks}, | |
1935 | {TIPC_NLA_STATS_TX_ACKS, s->sent_acks}, | |
1936 | {TIPC_NLA_STATS_RETRANSMITTED, s->retransmitted}, | |
1937 | {TIPC_NLA_STATS_DUPLICATES, s->duplicates}, | |
1938 | {TIPC_NLA_STATS_LINK_CONGS, s->link_congs}, | |
1939 | {TIPC_NLA_STATS_MAX_QUEUE, s->max_queue_sz}, | |
1940 | {TIPC_NLA_STATS_AVG_QUEUE, s->queue_sz_counts ? | |
1941 | (s->accu_queue_sz / s->queue_sz_counts) : 0} | |
1942 | }; | |
1943 | ||
1944 | stats = nla_nest_start(skb, TIPC_NLA_LINK_STATS); | |
1945 | if (!stats) | |
1946 | return -EMSGSIZE; | |
1947 | ||
1948 | for (i = 0; i < ARRAY_SIZE(map); i++) | |
1949 | if (nla_put_u32(skb, map[i].key, map[i].val)) | |
1950 | goto msg_full; | |
1951 | ||
1952 | nla_nest_end(skb, stats); | |
1953 | ||
1954 | return 0; | |
1955 | msg_full: | |
1956 | nla_nest_cancel(skb, stats); | |
1957 | ||
1958 | return -EMSGSIZE; | |
1959 | } | |
1960 | ||
1961 | /* Caller should hold appropriate locks to protect the link */ | |
5be9c086 JPM |
1962 | int __tipc_nl_add_link(struct net *net, struct tipc_nl_msg *msg, |
1963 | struct tipc_link *link, int nlflags) | |
7be57fc6 RA |
1964 | { |
1965 | int err; | |
1966 | void *hdr; | |
1967 | struct nlattr *attrs; | |
1968 | struct nlattr *prop; | |
34747539 | 1969 | struct tipc_net *tn = net_generic(net, tipc_net_id); |
7be57fc6 | 1970 | |
bfb3e5dd | 1971 | hdr = genlmsg_put(msg->skb, msg->portid, msg->seq, &tipc_genl_family, |
f2f67390 | 1972 | nlflags, TIPC_NL_LINK_GET); |
7be57fc6 RA |
1973 | if (!hdr) |
1974 | return -EMSGSIZE; | |
1975 | ||
1976 | attrs = nla_nest_start(msg->skb, TIPC_NLA_LINK); | |
1977 | if (!attrs) | |
1978 | goto msg_full; | |
1979 | ||
1980 | if (nla_put_string(msg->skb, TIPC_NLA_LINK_NAME, link->name)) | |
1981 | goto attr_msg_full; | |
1982 | if (nla_put_u32(msg->skb, TIPC_NLA_LINK_DEST, | |
34747539 | 1983 | tipc_cluster_mask(tn->own_addr))) |
7be57fc6 | 1984 | goto attr_msg_full; |
ed193ece | 1985 | if (nla_put_u32(msg->skb, TIPC_NLA_LINK_MTU, link->mtu)) |
7be57fc6 | 1986 | goto attr_msg_full; |
95901122 | 1987 | if (nla_put_u32(msg->skb, TIPC_NLA_LINK_RX, link->stats.recv_pkts)) |
7be57fc6 | 1988 | goto attr_msg_full; |
95901122 | 1989 | if (nla_put_u32(msg->skb, TIPC_NLA_LINK_TX, link->stats.sent_pkts)) |
7be57fc6 RA |
1990 | goto attr_msg_full; |
1991 | ||
1992 | if (tipc_link_is_up(link)) | |
1993 | if (nla_put_flag(msg->skb, TIPC_NLA_LINK_UP)) | |
1994 | goto attr_msg_full; | |
c72fa872 | 1995 | if (link->active) |
7be57fc6 RA |
1996 | if (nla_put_flag(msg->skb, TIPC_NLA_LINK_ACTIVE)) |
1997 | goto attr_msg_full; | |
1998 | ||
1999 | prop = nla_nest_start(msg->skb, TIPC_NLA_LINK_PROP); | |
2000 | if (!prop) | |
2001 | goto attr_msg_full; | |
2002 | if (nla_put_u32(msg->skb, TIPC_NLA_PROP_PRIO, link->priority)) | |
2003 | goto prop_msg_full; | |
2004 | if (nla_put_u32(msg->skb, TIPC_NLA_PROP_TOL, link->tolerance)) | |
2005 | goto prop_msg_full; | |
2006 | if (nla_put_u32(msg->skb, TIPC_NLA_PROP_WIN, | |
1f66d161 | 2007 | link->window)) |
7be57fc6 RA |
2008 | goto prop_msg_full; |
2009 | if (nla_put_u32(msg->skb, TIPC_NLA_PROP_PRIO, link->priority)) | |
2010 | goto prop_msg_full; | |
2011 | nla_nest_end(msg->skb, prop); | |
2012 | ||
2013 | err = __tipc_nl_add_stats(msg->skb, &link->stats); | |
2014 | if (err) | |
2015 | goto attr_msg_full; | |
2016 | ||
2017 | nla_nest_end(msg->skb, attrs); | |
2018 | genlmsg_end(msg->skb, hdr); | |
2019 | ||
2020 | return 0; | |
2021 | ||
2022 | prop_msg_full: | |
2023 | nla_nest_cancel(msg->skb, prop); | |
2024 | attr_msg_full: | |
2025 | nla_nest_cancel(msg->skb, attrs); | |
2026 | msg_full: | |
2027 | genlmsg_cancel(msg->skb, hdr); | |
2028 | ||
2029 | return -EMSGSIZE; | |
2030 | } | |
38206d59 JPM |
2031 | |
2032 | static int __tipc_nl_add_bc_link_stat(struct sk_buff *skb, | |
2033 | struct tipc_stats *stats) | |
2034 | { | |
2035 | int i; | |
2036 | struct nlattr *nest; | |
2037 | ||
2038 | struct nla_map { | |
2039 | __u32 key; | |
2040 | __u32 val; | |
2041 | }; | |
2042 | ||
2043 | struct nla_map map[] = { | |
95901122 | 2044 | {TIPC_NLA_STATS_RX_INFO, stats->recv_pkts}, |
38206d59 JPM |
2045 | {TIPC_NLA_STATS_RX_FRAGMENTS, stats->recv_fragments}, |
2046 | {TIPC_NLA_STATS_RX_FRAGMENTED, stats->recv_fragmented}, | |
2047 | {TIPC_NLA_STATS_RX_BUNDLES, stats->recv_bundles}, | |
2048 | {TIPC_NLA_STATS_RX_BUNDLED, stats->recv_bundled}, | |
95901122 | 2049 | {TIPC_NLA_STATS_TX_INFO, stats->sent_pkts}, |
38206d59 JPM |
2050 | {TIPC_NLA_STATS_TX_FRAGMENTS, stats->sent_fragments}, |
2051 | {TIPC_NLA_STATS_TX_FRAGMENTED, stats->sent_fragmented}, | |
2052 | {TIPC_NLA_STATS_TX_BUNDLES, stats->sent_bundles}, | |
2053 | {TIPC_NLA_STATS_TX_BUNDLED, stats->sent_bundled}, | |
2054 | {TIPC_NLA_STATS_RX_NACKS, stats->recv_nacks}, | |
2055 | {TIPC_NLA_STATS_RX_DEFERRED, stats->deferred_recv}, | |
2056 | {TIPC_NLA_STATS_TX_NACKS, stats->sent_nacks}, | |
2057 | {TIPC_NLA_STATS_TX_ACKS, stats->sent_acks}, | |
2058 | {TIPC_NLA_STATS_RETRANSMITTED, stats->retransmitted}, | |
2059 | {TIPC_NLA_STATS_DUPLICATES, stats->duplicates}, | |
2060 | {TIPC_NLA_STATS_LINK_CONGS, stats->link_congs}, | |
2061 | {TIPC_NLA_STATS_MAX_QUEUE, stats->max_queue_sz}, | |
2062 | {TIPC_NLA_STATS_AVG_QUEUE, stats->queue_sz_counts ? | |
2063 | (stats->accu_queue_sz / stats->queue_sz_counts) : 0} | |
2064 | }; | |
2065 | ||
2066 | nest = nla_nest_start(skb, TIPC_NLA_LINK_STATS); | |
2067 | if (!nest) | |
2068 | return -EMSGSIZE; | |
2069 | ||
2070 | for (i = 0; i < ARRAY_SIZE(map); i++) | |
2071 | if (nla_put_u32(skb, map[i].key, map[i].val)) | |
2072 | goto msg_full; | |
2073 | ||
2074 | nla_nest_end(skb, nest); | |
2075 | ||
2076 | return 0; | |
2077 | msg_full: | |
2078 | nla_nest_cancel(skb, nest); | |
2079 | ||
2080 | return -EMSGSIZE; | |
2081 | } | |
2082 | ||
2083 | int tipc_nl_add_bc_link(struct net *net, struct tipc_nl_msg *msg) | |
2084 | { | |
2085 | int err; | |
2086 | void *hdr; | |
2087 | struct nlattr *attrs; | |
2088 | struct nlattr *prop; | |
2089 | struct tipc_net *tn = net_generic(net, tipc_net_id); | |
2090 | struct tipc_link *bcl = tn->bcl; | |
2091 | ||
2092 | if (!bcl) | |
2093 | return 0; | |
2094 | ||
2095 | tipc_bcast_lock(net); | |
2096 | ||
2097 | hdr = genlmsg_put(msg->skb, msg->portid, msg->seq, &tipc_genl_family, | |
2098 | NLM_F_MULTI, TIPC_NL_LINK_GET); | |
b53ce3e7 IY |
2099 | if (!hdr) { |
2100 | tipc_bcast_unlock(net); | |
38206d59 | 2101 | return -EMSGSIZE; |
b53ce3e7 | 2102 | } |
38206d59 JPM |
2103 | |
2104 | attrs = nla_nest_start(msg->skb, TIPC_NLA_LINK); | |
2105 | if (!attrs) | |
2106 | goto msg_full; | |
2107 | ||
2108 | /* The broadcast link is always up */ | |
2109 | if (nla_put_flag(msg->skb, TIPC_NLA_LINK_UP)) | |
2110 | goto attr_msg_full; | |
2111 | ||
2112 | if (nla_put_flag(msg->skb, TIPC_NLA_LINK_BROADCAST)) | |
2113 | goto attr_msg_full; | |
2114 | if (nla_put_string(msg->skb, TIPC_NLA_LINK_NAME, bcl->name)) | |
2115 | goto attr_msg_full; | |
95901122 | 2116 | if (nla_put_u32(msg->skb, TIPC_NLA_LINK_RX, 0)) |
38206d59 | 2117 | goto attr_msg_full; |
95901122 | 2118 | if (nla_put_u32(msg->skb, TIPC_NLA_LINK_TX, 0)) |
38206d59 JPM |
2119 | goto attr_msg_full; |
2120 | ||
2121 | prop = nla_nest_start(msg->skb, TIPC_NLA_LINK_PROP); | |
2122 | if (!prop) | |
2123 | goto attr_msg_full; | |
2124 | if (nla_put_u32(msg->skb, TIPC_NLA_PROP_WIN, bcl->window)) | |
2125 | goto prop_msg_full; | |
2126 | nla_nest_end(msg->skb, prop); | |
2127 | ||
2128 | err = __tipc_nl_add_bc_link_stat(msg->skb, &bcl->stats); | |
2129 | if (err) | |
2130 | goto attr_msg_full; | |
2131 | ||
2132 | tipc_bcast_unlock(net); | |
2133 | nla_nest_end(msg->skb, attrs); | |
2134 | genlmsg_end(msg->skb, hdr); | |
2135 | ||
2136 | return 0; | |
2137 | ||
2138 | prop_msg_full: | |
2139 | nla_nest_cancel(msg->skb, prop); | |
2140 | attr_msg_full: | |
2141 | nla_nest_cancel(msg->skb, attrs); | |
2142 | msg_full: | |
2143 | tipc_bcast_unlock(net); | |
2144 | genlmsg_cancel(msg->skb, hdr); | |
2145 | ||
2146 | return -EMSGSIZE; | |
2147 | } | |
2148 | ||
d01332f1 RA |
2149 | void tipc_link_set_tolerance(struct tipc_link *l, u32 tol, |
2150 | struct sk_buff_head *xmitq) | |
38206d59 JPM |
2151 | { |
2152 | l->tolerance = tol; | |
8d6e79d3 | 2153 | tipc_link_build_proto_msg(l, STATE_MSG, 0, 0, 0, tol, 0, xmitq); |
38206d59 JPM |
2154 | } |
2155 | ||
d01332f1 RA |
2156 | void tipc_link_set_prio(struct tipc_link *l, u32 prio, |
2157 | struct sk_buff_head *xmitq) | |
38206d59 JPM |
2158 | { |
2159 | l->priority = prio; | |
8d6e79d3 | 2160 | tipc_link_build_proto_msg(l, STATE_MSG, 0, 0, 0, 0, prio, xmitq); |
38206d59 JPM |
2161 | } |
2162 | ||
2163 | void tipc_link_set_abort_limit(struct tipc_link *l, u32 limit) | |
2164 | { | |
2165 | l->abort_limit = limit; | |
2166 | } |