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" |
b4b9771b | 46 | #include "trace.h" |
fc1b6d6d | 47 | #include "crypto.h" |
b97bf3fd | 48 | |
796c75d0 YX |
49 | #include <linux/pkt_sched.h> |
50 | ||
38206d59 | 51 | struct tipc_stats { |
95901122 JPM |
52 | u32 sent_pkts; |
53 | u32 recv_pkts; | |
38206d59 JPM |
54 | u32 sent_states; |
55 | u32 recv_states; | |
56 | u32 sent_probes; | |
57 | u32 recv_probes; | |
58 | u32 sent_nacks; | |
59 | u32 recv_nacks; | |
60 | u32 sent_acks; | |
61 | u32 sent_bundled; | |
62 | u32 sent_bundles; | |
63 | u32 recv_bundled; | |
64 | u32 recv_bundles; | |
65 | u32 retransmitted; | |
66 | u32 sent_fragmented; | |
67 | u32 sent_fragments; | |
68 | u32 recv_fragmented; | |
69 | u32 recv_fragments; | |
70 | u32 link_congs; /* # port sends blocked by congestion */ | |
71 | u32 deferred_recv; | |
72 | u32 duplicates; | |
73 | u32 max_queue_sz; /* send queue size high water mark */ | |
74 | u32 accu_queue_sz; /* used for send queue size profiling */ | |
75 | u32 queue_sz_counts; /* used for send queue size profiling */ | |
76 | u32 msg_length_counts; /* used for message length profiling */ | |
77 | u32 msg_lengths_total; /* used for message length profiling */ | |
78 | u32 msg_length_profile[7]; /* used for msg. length profiling */ | |
79 | }; | |
80 | ||
81 | /** | |
82 | * struct tipc_link - TIPC link data structure | |
83 | * @addr: network address of link's peer node | |
84 | * @name: link name character string | |
38206d59 | 85 | * @net: pointer to namespace struct |
38206d59 JPM |
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] | |
38206d59 JPM |
90 | * @abort_limit: # of unacknowledged continuity probes needed to reset link |
91 | * @state: current state of link FSM | |
92 | * @peer_caps: bitmap describing capabilities of peer node | |
93 | * @silent_intv_cnt: # of timer intervals without any reception from peer | |
38206d59 JPM |
94 | * @priority: current link priority |
95 | * @net_plane: current link network plane ('A' through 'H') | |
35c55c98 | 96 | * @mon_state: cookie with information needed by link monitor |
38206d59 JPM |
97 | * @mtu: current maximum packet size for this link |
98 | * @advertised_mtu: advertised own mtu when link is being established | |
38206d59 | 99 | * @backlogq: queue for messages waiting to be sent |
38206d59 JPM |
100 | * @ackers: # of peers that needs to ack each packet before it can be released |
101 | * @acked: # last packet acked by a certain peer. Used for broadcast. | |
102 | * @rcv_nxt: next sequence number to expect for inbound messages | |
38206d59 JPM |
103 | * @inputq: buffer queue for messages to be delivered upwards |
104 | * @namedq: buffer queue for name table messages to be delivered upwards | |
38206d59 | 105 | * @wakeupq: linked list of wakeup msgs waiting for link congestion to abate |
38206d59 | 106 | * @reasm_buf: head of partially reassembled inbound message fragments |
38206d59 | 107 | * @stats: collects statistics regarding link activity |
a99df449 RD |
108 | * @session: session to be used by link |
109 | * @snd_nxt_state: next send seq number | |
110 | * @rcv_nxt_state: next rcv seq number | |
111 | * @in_session: have received ACTIVATE_MSG from peer | |
112 | * @active: link is active | |
113 | * @if_name: associated interface name | |
114 | * @rst_cnt: link reset counter | |
115 | * @drop_point: seq number for failover handling (FIXME) | |
116 | * @failover_reasm_skb: saved failover msg ptr (FIXME) | |
117 | * @failover_deferdq: deferred message queue for failover processing (FIXME) | |
118 | * @transmq: the link's transmit queue | |
119 | * @backlog: link's backlog by priority (importance) | |
120 | * @snd_nxt: next sequence number to be used | |
121 | * @rcv_unacked: # messages read by user, but not yet acked back to peer | |
122 | * @deferdq: deferred receive queue | |
123 | * @window: sliding window size for congestion handling | |
124 | * @min_win: minimal send window to be used by link | |
125 | * @ssthresh: slow start threshold for congestion handling | |
126 | * @max_win: maximal send window to be used by link | |
127 | * @cong_acks: congestion acks for congestion avoidance (FIXME) | |
128 | * @checkpoint: seq number for congestion window size handling | |
129 | * @reasm_tnlmsg: fragmentation/reassembly area for tunnel protocol message | |
130 | * @last_gap: last gap ack blocks for bcast (FIXME) | |
131 | * @last_ga: ptr to gap ack blocks | |
132 | * @bc_rcvlink: the peer specific link used for broadcast reception | |
133 | * @bc_sndlink: the namespace global link used for broadcast sending | |
134 | * @nack_state: bcast nack state | |
135 | * @bc_peer_is_up: peer has acked the bcast init msg | |
38206d59 JPM |
136 | */ |
137 | struct tipc_link { | |
138 | u32 addr; | |
139 | char name[TIPC_MAX_LINK_NAME]; | |
38206d59 JPM |
140 | struct net *net; |
141 | ||
142 | /* Management and link supervision data */ | |
7ea817f4 JM |
143 | u16 peer_session; |
144 | u16 session; | |
9012de50 JM |
145 | u16 snd_nxt_state; |
146 | u16 rcv_nxt_state; | |
38206d59 JPM |
147 | u32 peer_bearer_id; |
148 | u32 bearer_id; | |
149 | u32 tolerance; | |
38206d59 JPM |
150 | u32 abort_limit; |
151 | u32 state; | |
152 | u16 peer_caps; | |
7ea817f4 | 153 | bool in_session; |
38206d59 JPM |
154 | bool active; |
155 | u32 silent_intv_cnt; | |
e74a386d | 156 | char if_name[TIPC_MAX_IF_NAME]; |
38206d59 JPM |
157 | u32 priority; |
158 | char net_plane; | |
35c55c98 | 159 | struct tipc_mon_state mon_state; |
88e8ac70 | 160 | u16 rst_cnt; |
38206d59 JPM |
161 | |
162 | /* Failover/synch */ | |
163 | u16 drop_point; | |
164 | struct sk_buff *failover_reasm_skb; | |
58ee86b8 | 165 | struct sk_buff_head failover_deferdq; |
38206d59 JPM |
166 | |
167 | /* Max packet negotiation */ | |
168 | u16 mtu; | |
169 | u16 advertised_mtu; | |
170 | ||
171 | /* Sending */ | |
172 | struct sk_buff_head transmq; | |
173 | struct sk_buff_head backlogq; | |
174 | struct { | |
175 | u16 len; | |
176 | u16 limit; | |
e95584a8 | 177 | struct sk_buff *target_bskb; |
38206d59 JPM |
178 | } backlog[5]; |
179 | u16 snd_nxt; | |
38206d59 JPM |
180 | |
181 | /* Reception */ | |
182 | u16 rcv_nxt; | |
183 | u32 rcv_unacked; | |
184 | struct sk_buff_head deferdq; | |
185 | struct sk_buff_head *inputq; | |
186 | struct sk_buff_head *namedq; | |
187 | ||
188 | /* Congestion handling */ | |
189 | struct sk_buff_head wakeupq; | |
16ad3f40 JM |
190 | u16 window; |
191 | u16 min_win; | |
192 | u16 ssthresh; | |
193 | u16 max_win; | |
194 | u16 cong_acks; | |
195 | u16 checkpoint; | |
38206d59 JPM |
196 | |
197 | /* Fragmentation/reassembly */ | |
198 | struct sk_buff *reasm_buf; | |
2320bcda | 199 | struct sk_buff *reasm_tnlmsg; |
38206d59 JPM |
200 | |
201 | /* Broadcast */ | |
202 | u16 ackers; | |
203 | u16 acked; | |
d7626b5a TL |
204 | u16 last_gap; |
205 | struct tipc_gap_ack_blks *last_ga; | |
38206d59 JPM |
206 | struct tipc_link *bc_rcvlink; |
207 | struct tipc_link *bc_sndlink; | |
7c4a54b9 | 208 | u8 nack_state; |
38206d59 JPM |
209 | bool bc_peer_is_up; |
210 | ||
211 | /* Statistics */ | |
212 | struct tipc_stats stats; | |
213 | }; | |
214 | ||
2cf8aa19 EH |
215 | /* |
216 | * Error message prefixes | |
217 | */ | |
6e498158 | 218 | static const char *link_co_err = "Link tunneling error, "; |
2cf8aa19 | 219 | static const char *link_rst_msg = "Resetting link "; |
7be57fc6 | 220 | |
52666986 JPM |
221 | /* Send states for broadcast NACKs |
222 | */ | |
223 | enum { | |
224 | BC_NACK_SND_CONDITIONAL, | |
225 | BC_NACK_SND_UNCONDITIONAL, | |
226 | BC_NACK_SND_SUPPRESS, | |
227 | }; | |
228 | ||
53962bce | 229 | #define TIPC_BC_RETR_LIM (jiffies + msecs_to_jiffies(10)) |
382f598f | 230 | #define TIPC_UC_RETR_TIME (jiffies + msecs_to_jiffies(1)) |
7c4a54b9 | 231 | |
662921cd | 232 | /* Link FSM states: |
b97bf3fd | 233 | */ |
d3504c34 | 234 | enum { |
662921cd JPM |
235 | LINK_ESTABLISHED = 0xe, |
236 | LINK_ESTABLISHING = 0xe << 4, | |
237 | LINK_RESET = 0x1 << 8, | |
238 | LINK_RESETTING = 0x2 << 12, | |
239 | LINK_PEER_RESET = 0xd << 16, | |
240 | LINK_FAILINGOVER = 0xf << 20, | |
241 | LINK_SYNCHING = 0xc << 24 | |
d3504c34 JPM |
242 | }; |
243 | ||
244 | /* Link FSM state checking routines | |
245 | */ | |
662921cd | 246 | static int link_is_up(struct tipc_link *l) |
d3504c34 | 247 | { |
662921cd | 248 | return l->state & (LINK_ESTABLISHED | LINK_SYNCHING); |
d3504c34 | 249 | } |
b97bf3fd | 250 | |
d999297c JPM |
251 | static int tipc_link_proto_rcv(struct tipc_link *l, struct sk_buff *skb, |
252 | struct sk_buff_head *xmitq); | |
426cc2b8 | 253 | static void tipc_link_build_proto_msg(struct tipc_link *l, int mtyp, bool probe, |
8d6e79d3 JM |
254 | bool probe_reply, u16 rcvgap, |
255 | int tolerance, int priority, | |
426cc2b8 | 256 | struct sk_buff_head *xmitq); |
1a90632d | 257 | static void link_print(struct tipc_link *l, const char *str); |
e0a05ebe JPM |
258 | static int tipc_link_build_nack_msg(struct tipc_link *l, |
259 | struct sk_buff_head *xmitq); | |
52666986 JPM |
260 | static void tipc_link_build_bc_init_msg(struct tipc_link *l, |
261 | struct sk_buff_head *xmitq); | |
d7626b5a TL |
262 | static u8 __tipc_build_gap_ack_blks(struct tipc_gap_ack_blks *ga, |
263 | struct tipc_link *l, u8 start_index); | |
264 | static u16 tipc_build_gap_ack_blks(struct tipc_link *l, struct tipc_msg *hdr); | |
265 | static int tipc_link_advance_transmq(struct tipc_link *l, struct tipc_link *r, | |
266 | u16 acked, u16 gap, | |
6a6b5c8b | 267 | struct tipc_gap_ack_blks *ga, |
d7626b5a TL |
268 | struct sk_buff_head *xmitq, |
269 | bool *retransmitted, int *rc); | |
16ad3f40 JM |
270 | static void tipc_link_update_cwin(struct tipc_link *l, int released, |
271 | bool retransmitted); | |
b97bf3fd | 272 | /* |
05790c64 | 273 | * Simple non-static link routines (i.e. referenced outside this file) |
b97bf3fd | 274 | */ |
662921cd | 275 | bool tipc_link_is_up(struct tipc_link *l) |
b97bf3fd | 276 | { |
662921cd JPM |
277 | return link_is_up(l); |
278 | } | |
279 | ||
c8199300 JPM |
280 | bool tipc_link_peer_is_down(struct tipc_link *l) |
281 | { | |
282 | return l->state == LINK_PEER_RESET; | |
283 | } | |
284 | ||
662921cd JPM |
285 | bool tipc_link_is_reset(struct tipc_link *l) |
286 | { | |
287 | return l->state & (LINK_RESET | LINK_FAILINGOVER | LINK_ESTABLISHING); | |
288 | } | |
289 | ||
73f646ce JPM |
290 | bool tipc_link_is_establishing(struct tipc_link *l) |
291 | { | |
292 | return l->state == LINK_ESTABLISHING; | |
293 | } | |
294 | ||
662921cd JPM |
295 | bool tipc_link_is_synching(struct tipc_link *l) |
296 | { | |
297 | return l->state == LINK_SYNCHING; | |
298 | } | |
299 | ||
300 | bool tipc_link_is_failingover(struct tipc_link *l) | |
301 | { | |
302 | return l->state == LINK_FAILINGOVER; | |
303 | } | |
304 | ||
305 | bool tipc_link_is_blocked(struct tipc_link *l) | |
306 | { | |
307 | return l->state & (LINK_RESETTING | LINK_PEER_RESET | LINK_FAILINGOVER); | |
b97bf3fd PL |
308 | } |
309 | ||
742e0383 | 310 | static bool link_is_bc_sndlink(struct tipc_link *l) |
52666986 JPM |
311 | { |
312 | return !l->bc_sndlink; | |
313 | } | |
314 | ||
742e0383 | 315 | static bool link_is_bc_rcvlink(struct tipc_link *l) |
52666986 JPM |
316 | { |
317 | return ((l->bc_rcvlink == l) && !link_is_bc_sndlink(l)); | |
318 | } | |
319 | ||
c72fa872 JPM |
320 | void tipc_link_set_active(struct tipc_link *l, bool active) |
321 | { | |
322 | l->active = active; | |
b97bf3fd PL |
323 | } |
324 | ||
38206d59 JPM |
325 | u32 tipc_link_id(struct tipc_link *l) |
326 | { | |
327 | return l->peer_bearer_id << 16 | l->bearer_id; | |
328 | } | |
329 | ||
16ad3f40 | 330 | int tipc_link_min_win(struct tipc_link *l) |
38206d59 | 331 | { |
16ad3f40 JM |
332 | return l->min_win; |
333 | } | |
334 | ||
335 | int tipc_link_max_win(struct tipc_link *l) | |
336 | { | |
337 | return l->max_win; | |
38206d59 JPM |
338 | } |
339 | ||
340 | int tipc_link_prio(struct tipc_link *l) | |
341 | { | |
342 | return l->priority; | |
343 | } | |
344 | ||
345 | unsigned long tipc_link_tolerance(struct tipc_link *l) | |
346 | { | |
347 | return l->tolerance; | |
348 | } | |
349 | ||
350 | struct sk_buff_head *tipc_link_inputq(struct tipc_link *l) | |
351 | { | |
352 | return l->inputq; | |
353 | } | |
354 | ||
355 | char tipc_link_plane(struct tipc_link *l) | |
356 | { | |
357 | return l->net_plane; | |
358 | } | |
359 | ||
be07f056 XL |
360 | struct net *tipc_link_net(struct tipc_link *l) |
361 | { | |
362 | return l->net; | |
363 | } | |
364 | ||
9012de50 JM |
365 | void tipc_link_update_caps(struct tipc_link *l, u16 capabilities) |
366 | { | |
367 | l->peer_caps = capabilities; | |
368 | } | |
369 | ||
52666986 JPM |
370 | void tipc_link_add_bc_peer(struct tipc_link *snd_l, |
371 | struct tipc_link *uc_l, | |
372 | struct sk_buff_head *xmitq) | |
2f566124 | 373 | { |
52666986 JPM |
374 | struct tipc_link *rcv_l = uc_l->bc_rcvlink; |
375 | ||
376 | snd_l->ackers++; | |
377 | rcv_l->acked = snd_l->snd_nxt - 1; | |
9a650838 | 378 | snd_l->state = LINK_ESTABLISHED; |
52666986 | 379 | tipc_link_build_bc_init_msg(uc_l, xmitq); |
2f566124 JPM |
380 | } |
381 | ||
52666986 JPM |
382 | void tipc_link_remove_bc_peer(struct tipc_link *snd_l, |
383 | struct tipc_link *rcv_l, | |
384 | struct sk_buff_head *xmitq) | |
2f566124 | 385 | { |
52666986 JPM |
386 | u16 ack = snd_l->snd_nxt - 1; |
387 | ||
388 | snd_l->ackers--; | |
a71eb720 JPM |
389 | rcv_l->bc_peer_is_up = true; |
390 | rcv_l->state = LINK_ESTABLISHED; | |
a91d55d1 | 391 | tipc_link_bc_ack_rcv(rcv_l, ack, 0, NULL, xmitq, NULL); |
26574db0 | 392 | trace_tipc_link_reset(rcv_l, TIPC_DUMP_ALL, "bclink removed!"); |
52666986 JPM |
393 | tipc_link_reset(rcv_l); |
394 | rcv_l->state = LINK_RESET; | |
395 | if (!snd_l->ackers) { | |
26574db0 | 396 | trace_tipc_link_reset(snd_l, TIPC_DUMP_ALL, "zero ackers!"); |
52666986 | 397 | tipc_link_reset(snd_l); |
9a650838 | 398 | snd_l->state = LINK_RESET; |
52666986 JPM |
399 | __skb_queue_purge(xmitq); |
400 | } | |
2f566124 JPM |
401 | } |
402 | ||
403 | int tipc_link_bc_peers(struct tipc_link *l) | |
404 | { | |
405 | return l->ackers; | |
406 | } | |
407 | ||
e064cce1 | 408 | static u16 link_bc_rcv_gap(struct tipc_link *l) |
02d11ca2 JPM |
409 | { |
410 | struct sk_buff *skb = skb_peek(&l->deferdq); | |
411 | u16 gap = 0; | |
412 | ||
413 | if (more(l->snd_nxt, l->rcv_nxt)) | |
414 | gap = l->snd_nxt - l->rcv_nxt; | |
415 | if (skb) | |
416 | gap = buf_seqno(skb) - l->rcv_nxt; | |
417 | return gap; | |
418 | } | |
419 | ||
959e1781 JPM |
420 | void tipc_link_set_mtu(struct tipc_link *l, int mtu) |
421 | { | |
422 | l->mtu = mtu; | |
423 | } | |
424 | ||
425 | int tipc_link_mtu(struct tipc_link *l) | |
426 | { | |
427 | return l->mtu; | |
428 | } | |
429 | ||
fc1b6d6d TL |
430 | int tipc_link_mss(struct tipc_link *l) |
431 | { | |
432 | #ifdef CONFIG_TIPC_CRYPTO | |
433 | return l->mtu - INT_H_SIZE - EMSG_OVERHEAD; | |
434 | #else | |
435 | return l->mtu - INT_H_SIZE; | |
436 | #endif | |
437 | } | |
438 | ||
38206d59 JPM |
439 | u16 tipc_link_rcv_nxt(struct tipc_link *l) |
440 | { | |
441 | return l->rcv_nxt; | |
442 | } | |
443 | ||
444 | u16 tipc_link_acked(struct tipc_link *l) | |
445 | { | |
446 | return l->acked; | |
447 | } | |
448 | ||
449 | char *tipc_link_name(struct tipc_link *l) | |
450 | { | |
451 | return l->name; | |
452 | } | |
453 | ||
c140eb16 LDC |
454 | u32 tipc_link_state(struct tipc_link *l) |
455 | { | |
456 | return l->state; | |
457 | } | |
458 | ||
b97bf3fd | 459 | /** |
4323add6 | 460 | * tipc_link_create - create a new link |
d8141208 | 461 | * @net: pointer to associated network namespace |
0e05498e JPM |
462 | * @if_name: associated interface name |
463 | * @bearer_id: id (index) of associated bearer | |
464 | * @tolerance: link tolerance to be used by link | |
465 | * @net_plane: network plane (A,B,c..) this link belongs to | |
466 | * @mtu: mtu to be advertised by link | |
467 | * @priority: priority to be used by link | |
16ad3f40 JM |
468 | * @min_win: minimal send window to be used by link |
469 | * @max_win: maximal send window to be used by link | |
0e05498e | 470 | * @session: session to be used by link |
0e05498e | 471 | * @peer: node id of peer node |
fd556f20 | 472 | * @peer_caps: bitmap describing peer node capabilities |
52666986 JPM |
473 | * @bc_sndlink: the namespace global link used for broadcast sending |
474 | * @bc_rcvlink: the peer specific link used for broadcast reception | |
440d8963 JPM |
475 | * @inputq: queue to put messages ready for delivery |
476 | * @namedq: queue to put binding table update messages ready for delivery | |
477 | * @link: return value, pointer to put the created link | |
a99df449 RD |
478 | * @self: local unicast link id |
479 | * @peer_id: 128-bit ID of peer | |
c4307285 | 480 | * |
637b77fd | 481 | * Return: true if link was created, otherwise false |
b97bf3fd | 482 | */ |
c72fa872 | 483 | bool tipc_link_create(struct net *net, char *if_name, int bearer_id, |
0e05498e | 484 | int tolerance, char net_plane, u32 mtu, int priority, |
16ad3f40 | 485 | u32 min_win, u32 max_win, u32 session, u32 self, |
25b0b9c4 | 486 | u32 peer, u8 *peer_id, u16 peer_caps, |
52666986 JPM |
487 | struct tipc_link *bc_sndlink, |
488 | struct tipc_link *bc_rcvlink, | |
489 | struct sk_buff_head *inputq, | |
490 | struct sk_buff_head *namedq, | |
440d8963 | 491 | struct tipc_link **link) |
b97bf3fd | 492 | { |
25b0b9c4 JM |
493 | char peer_str[NODE_ID_STR_LEN] = {0,}; |
494 | char self_str[NODE_ID_STR_LEN] = {0,}; | |
440d8963 | 495 | struct tipc_link *l; |
37b9c08a | 496 | |
440d8963 JPM |
497 | l = kzalloc(sizeof(*l), GFP_ATOMIC); |
498 | if (!l) | |
499 | return false; | |
500 | *link = l; | |
e74a386d | 501 | l->session = session; |
37b9c08a | 502 | |
25b0b9c4 JM |
503 | /* Set link name for unicast links only */ |
504 | if (peer_id) { | |
505 | tipc_nodeid2string(self_str, tipc_own_id(net)); | |
506 | if (strlen(self_str) > 16) | |
507 | sprintf(self_str, "%x", self); | |
508 | tipc_nodeid2string(peer_str, peer_id); | |
509 | if (strlen(peer_str) > 16) | |
510 | sprintf(peer_str, "%x", peer); | |
511 | } | |
512 | /* Peer i/f name will be completed by reset/activate message */ | |
7494cfa6 JM |
513 | snprintf(l->name, sizeof(l->name), "%s:%s-%s:unknown", |
514 | self_str, if_name, peer_str); | |
25b0b9c4 | 515 | |
e74a386d | 516 | strcpy(l->if_name, if_name); |
440d8963 | 517 | l->addr = peer; |
fd556f20 | 518 | l->peer_caps = peer_caps; |
c72fa872 | 519 | l->net = net; |
7ea817f4 | 520 | l->in_session = false; |
0e05498e JPM |
521 | l->bearer_id = bearer_id; |
522 | l->tolerance = tolerance; | |
047491ea JM |
523 | if (bc_rcvlink) |
524 | bc_rcvlink->tolerance = tolerance; | |
0e05498e JPM |
525 | l->net_plane = net_plane; |
526 | l->advertised_mtu = mtu; | |
527 | l->mtu = mtu; | |
528 | l->priority = priority; | |
16ad3f40 | 529 | tipc_link_set_queue_limits(l, min_win, max_win); |
c1ab3f1d | 530 | l->ackers = 1; |
52666986 JPM |
531 | l->bc_sndlink = bc_sndlink; |
532 | l->bc_rcvlink = bc_rcvlink; | |
440d8963 JPM |
533 | l->inputq = inputq; |
534 | l->namedq = namedq; | |
535 | l->state = LINK_RESETTING; | |
440d8963 JPM |
536 | __skb_queue_head_init(&l->transmq); |
537 | __skb_queue_head_init(&l->backlogq); | |
538 | __skb_queue_head_init(&l->deferdq); | |
58ee86b8 | 539 | __skb_queue_head_init(&l->failover_deferdq); |
440d8963 JPM |
540 | skb_queue_head_init(&l->wakeupq); |
541 | skb_queue_head_init(l->inputq); | |
542 | return true; | |
b97bf3fd PL |
543 | } |
544 | ||
32301906 JPM |
545 | /** |
546 | * tipc_link_bc_create - create new link to be used for broadcast | |
d8141208 | 547 | * @net: pointer to associated network namespace |
4c94cc2d | 548 | * @mtu: mtu to be used initially if no peers |
2e5117ba LW |
549 | * @min_win: minimal send window to be used by link |
550 | * @max_win: maximal send window to be used by link | |
32301906 JPM |
551 | * @inputq: queue to put messages ready for delivery |
552 | * @namedq: queue to put binding table update messages ready for delivery | |
553 | * @link: return value, pointer to put the created link | |
a99df449 RD |
554 | * @ownnode: identity of own node |
555 | * @peer: node id of peer node | |
556 | * @peer_id: 128-bit ID of peer | |
557 | * @peer_caps: bitmap describing peer node capabilities | |
558 | * @bc_sndlink: the namespace global link used for broadcast sending | |
32301906 | 559 | * |
637b77fd | 560 | * Return: true if link was created, otherwise false |
32301906 | 561 | */ |
03b6fefd | 562 | bool tipc_link_bc_create(struct net *net, u32 ownnode, u32 peer, u8 *peer_id, |
16ad3f40 | 563 | int mtu, u32 min_win, u32 max_win, u16 peer_caps, |
32301906 JPM |
564 | struct sk_buff_head *inputq, |
565 | struct sk_buff_head *namedq, | |
52666986 | 566 | struct tipc_link *bc_sndlink, |
32301906 JPM |
567 | struct tipc_link **link) |
568 | { | |
569 | struct tipc_link *l; | |
570 | ||
16ad3f40 JM |
571 | if (!tipc_link_create(net, "", MAX_BEARERS, 0, 'Z', mtu, 0, min_win, |
572 | max_win, 0, ownnode, peer, NULL, peer_caps, | |
573 | bc_sndlink, NULL, inputq, namedq, link)) | |
32301906 JPM |
574 | return false; |
575 | ||
576 | l = *link; | |
03b6fefd TL |
577 | if (peer_id) { |
578 | char peer_str[NODE_ID_STR_LEN] = {0,}; | |
579 | ||
580 | tipc_nodeid2string(peer_str, peer_id); | |
581 | if (strlen(peer_str) > 16) | |
582 | sprintf(peer_str, "%x", peer); | |
583 | /* Broadcast receiver link name: "broadcast-link:<peer>" */ | |
584 | snprintf(l->name, sizeof(l->name), "%s:%s", tipc_bclink_name, | |
585 | peer_str); | |
586 | } else { | |
587 | strcpy(l->name, tipc_bclink_name); | |
588 | } | |
26574db0 | 589 | trace_tipc_link_reset(l, TIPC_DUMP_ALL, "bclink created!"); |
32301906 | 590 | tipc_link_reset(l); |
52666986 | 591 | l->state = LINK_RESET; |
2f566124 | 592 | l->ackers = 0; |
52666986 | 593 | l->bc_rcvlink = l; |
32301906 | 594 | |
52666986 JPM |
595 | /* Broadcast send link is always up */ |
596 | if (link_is_bc_sndlink(l)) | |
597 | l->state = LINK_ESTABLISHED; | |
d999297c | 598 | |
01fd12bb JPM |
599 | /* Disable replicast if even a single peer doesn't support it */ |
600 | if (link_is_bc_rcvlink(l) && !(peer_caps & TIPC_BCAST_RCAST)) | |
ba5f6a86 | 601 | tipc_bcast_toggle_rcast(net, false); |
01fd12bb | 602 | |
52666986 | 603 | return true; |
d999297c JPM |
604 | } |
605 | ||
6ab30f9c JPM |
606 | /** |
607 | * tipc_link_fsm_evt - link finite state machine | |
608 | * @l: pointer to link | |
609 | * @evt: state machine event to be processed | |
6ab30f9c | 610 | */ |
662921cd | 611 | int tipc_link_fsm_evt(struct tipc_link *l, int evt) |
6ab30f9c | 612 | { |
5045f7b9 | 613 | int rc = 0; |
26574db0 | 614 | int old_state = l->state; |
6ab30f9c JPM |
615 | |
616 | switch (l->state) { | |
662921cd | 617 | case LINK_RESETTING: |
6ab30f9c | 618 | switch (evt) { |
662921cd JPM |
619 | case LINK_PEER_RESET_EVT: |
620 | l->state = LINK_PEER_RESET; | |
6ab30f9c | 621 | break; |
662921cd JPM |
622 | case LINK_RESET_EVT: |
623 | l->state = LINK_RESET; | |
624 | break; | |
625 | case LINK_FAILURE_EVT: | |
626 | case LINK_FAILOVER_BEGIN_EVT: | |
627 | case LINK_ESTABLISH_EVT: | |
628 | case LINK_FAILOVER_END_EVT: | |
629 | case LINK_SYNCH_BEGIN_EVT: | |
630 | case LINK_SYNCH_END_EVT: | |
631 | default: | |
632 | goto illegal_evt; | |
633 | } | |
634 | break; | |
635 | case LINK_RESET: | |
636 | switch (evt) { | |
637 | case LINK_PEER_RESET_EVT: | |
638 | l->state = LINK_ESTABLISHING; | |
6ab30f9c | 639 | break; |
662921cd JPM |
640 | case LINK_FAILOVER_BEGIN_EVT: |
641 | l->state = LINK_FAILINGOVER; | |
1c78ba49 | 642 | break; |
662921cd JPM |
643 | case LINK_FAILURE_EVT: |
644 | case LINK_RESET_EVT: | |
645 | case LINK_ESTABLISH_EVT: | |
646 | case LINK_FAILOVER_END_EVT: | |
6ab30f9c | 647 | break; |
662921cd JPM |
648 | case LINK_SYNCH_BEGIN_EVT: |
649 | case LINK_SYNCH_END_EVT: | |
6ab30f9c | 650 | default: |
662921cd | 651 | goto illegal_evt; |
6ab30f9c JPM |
652 | } |
653 | break; | |
662921cd | 654 | case LINK_PEER_RESET: |
6ab30f9c | 655 | switch (evt) { |
662921cd JPM |
656 | case LINK_RESET_EVT: |
657 | l->state = LINK_ESTABLISHING; | |
6ab30f9c | 658 | break; |
662921cd JPM |
659 | case LINK_PEER_RESET_EVT: |
660 | case LINK_ESTABLISH_EVT: | |
661 | case LINK_FAILURE_EVT: | |
6ab30f9c | 662 | break; |
662921cd JPM |
663 | case LINK_SYNCH_BEGIN_EVT: |
664 | case LINK_SYNCH_END_EVT: | |
665 | case LINK_FAILOVER_BEGIN_EVT: | |
666 | case LINK_FAILOVER_END_EVT: | |
667 | default: | |
668 | goto illegal_evt; | |
669 | } | |
670 | break; | |
671 | case LINK_FAILINGOVER: | |
672 | switch (evt) { | |
673 | case LINK_FAILOVER_END_EVT: | |
674 | l->state = LINK_RESET; | |
6ab30f9c | 675 | break; |
662921cd JPM |
676 | case LINK_PEER_RESET_EVT: |
677 | case LINK_RESET_EVT: | |
678 | case LINK_ESTABLISH_EVT: | |
679 | case LINK_FAILURE_EVT: | |
680 | break; | |
681 | case LINK_FAILOVER_BEGIN_EVT: | |
682 | case LINK_SYNCH_BEGIN_EVT: | |
683 | case LINK_SYNCH_END_EVT: | |
6ab30f9c | 684 | default: |
662921cd | 685 | goto illegal_evt; |
6ab30f9c JPM |
686 | } |
687 | break; | |
662921cd | 688 | case LINK_ESTABLISHING: |
6ab30f9c | 689 | switch (evt) { |
662921cd JPM |
690 | case LINK_ESTABLISH_EVT: |
691 | l->state = LINK_ESTABLISHED; | |
6ab30f9c | 692 | break; |
662921cd JPM |
693 | case LINK_FAILOVER_BEGIN_EVT: |
694 | l->state = LINK_FAILINGOVER; | |
695 | break; | |
662921cd | 696 | case LINK_RESET_EVT: |
73f646ce JPM |
697 | l->state = LINK_RESET; |
698 | break; | |
662921cd | 699 | case LINK_FAILURE_EVT: |
73f646ce | 700 | case LINK_PEER_RESET_EVT: |
662921cd JPM |
701 | case LINK_SYNCH_BEGIN_EVT: |
702 | case LINK_FAILOVER_END_EVT: | |
703 | break; | |
704 | case LINK_SYNCH_END_EVT: | |
705 | default: | |
706 | goto illegal_evt; | |
707 | } | |
708 | break; | |
709 | case LINK_ESTABLISHED: | |
710 | switch (evt) { | |
711 | case LINK_PEER_RESET_EVT: | |
712 | l->state = LINK_PEER_RESET; | |
713 | rc |= TIPC_LINK_DOWN_EVT; | |
714 | break; | |
715 | case LINK_FAILURE_EVT: | |
716 | l->state = LINK_RESETTING; | |
717 | rc |= TIPC_LINK_DOWN_EVT; | |
6ab30f9c | 718 | break; |
662921cd JPM |
719 | case LINK_RESET_EVT: |
720 | l->state = LINK_RESET; | |
6ab30f9c | 721 | break; |
662921cd | 722 | case LINK_ESTABLISH_EVT: |
5ae2f8e6 | 723 | case LINK_SYNCH_END_EVT: |
6ab30f9c | 724 | break; |
662921cd JPM |
725 | case LINK_SYNCH_BEGIN_EVT: |
726 | l->state = LINK_SYNCHING; | |
727 | break; | |
662921cd JPM |
728 | case LINK_FAILOVER_BEGIN_EVT: |
729 | case LINK_FAILOVER_END_EVT: | |
6ab30f9c | 730 | default: |
662921cd | 731 | goto illegal_evt; |
6ab30f9c JPM |
732 | } |
733 | break; | |
662921cd | 734 | case LINK_SYNCHING: |
6ab30f9c | 735 | switch (evt) { |
662921cd JPM |
736 | case LINK_PEER_RESET_EVT: |
737 | l->state = LINK_PEER_RESET; | |
738 | rc |= TIPC_LINK_DOWN_EVT; | |
739 | break; | |
740 | case LINK_FAILURE_EVT: | |
741 | l->state = LINK_RESETTING; | |
742 | rc |= TIPC_LINK_DOWN_EVT; | |
6ab30f9c | 743 | break; |
662921cd JPM |
744 | case LINK_RESET_EVT: |
745 | l->state = LINK_RESET; | |
6ab30f9c | 746 | break; |
662921cd JPM |
747 | case LINK_ESTABLISH_EVT: |
748 | case LINK_SYNCH_BEGIN_EVT: | |
6ab30f9c | 749 | break; |
662921cd JPM |
750 | case LINK_SYNCH_END_EVT: |
751 | l->state = LINK_ESTABLISHED; | |
752 | break; | |
753 | case LINK_FAILOVER_BEGIN_EVT: | |
754 | case LINK_FAILOVER_END_EVT: | |
6ab30f9c | 755 | default: |
662921cd | 756 | goto illegal_evt; |
6ab30f9c JPM |
757 | } |
758 | break; | |
759 | default: | |
662921cd | 760 | pr_err("Unknown FSM state %x in %s\n", l->state, l->name); |
6ab30f9c | 761 | } |
26574db0 | 762 | trace_tipc_link_fsm(l->name, old_state, l->state, evt); |
662921cd JPM |
763 | return rc; |
764 | illegal_evt: | |
765 | pr_err("Illegal FSM event %x in state %x on link %s\n", | |
766 | evt, l->state, l->name); | |
26574db0 | 767 | trace_tipc_link_fsm(l->name, old_state, l->state, evt); |
6ab30f9c JPM |
768 | return rc; |
769 | } | |
770 | ||
333ef69e JPM |
771 | /* link_profile_stats - update statistical profiling of traffic |
772 | */ | |
773 | static void link_profile_stats(struct tipc_link *l) | |
774 | { | |
775 | struct sk_buff *skb; | |
776 | struct tipc_msg *msg; | |
777 | int length; | |
778 | ||
779 | /* Update counters used in statistical profiling of send traffic */ | |
780 | l->stats.accu_queue_sz += skb_queue_len(&l->transmq); | |
781 | l->stats.queue_sz_counts++; | |
782 | ||
783 | skb = skb_peek(&l->transmq); | |
784 | if (!skb) | |
785 | return; | |
786 | msg = buf_msg(skb); | |
787 | length = msg_size(msg); | |
788 | ||
789 | if (msg_user(msg) == MSG_FRAGMENTER) { | |
790 | if (msg_type(msg) != FIRST_FRAGMENT) | |
791 | return; | |
a7dc51ad | 792 | length = msg_size(msg_inner_hdr(msg)); |
333ef69e JPM |
793 | } |
794 | l->stats.msg_lengths_total += length; | |
795 | l->stats.msg_length_counts++; | |
796 | if (length <= 64) | |
797 | l->stats.msg_length_profile[0]++; | |
798 | else if (length <= 256) | |
799 | l->stats.msg_length_profile[1]++; | |
800 | else if (length <= 1024) | |
801 | l->stats.msg_length_profile[2]++; | |
802 | else if (length <= 4096) | |
803 | l->stats.msg_length_profile[3]++; | |
804 | else if (length <= 16384) | |
805 | l->stats.msg_length_profile[4]++; | |
806 | else if (length <= 32768) | |
807 | l->stats.msg_length_profile[5]++; | |
808 | else | |
809 | l->stats.msg_length_profile[6]++; | |
810 | } | |
811 | ||
26574db0 TL |
812 | /** |
813 | * tipc_link_too_silent - check if link is "too silent" | |
814 | * @l: tipc link to be checked | |
815 | * | |
637b77fd | 816 | * Return: true if the link 'silent_intv_cnt' is about to reach the |
26574db0 TL |
817 | * 'abort_limit' value, otherwise false |
818 | */ | |
819 | bool tipc_link_too_silent(struct tipc_link *l) | |
820 | { | |
821 | return (l->silent_intv_cnt + 2 > l->abort_limit); | |
822 | } | |
823 | ||
333ef69e JPM |
824 | /* tipc_link_timeout - perform periodic task as instructed from node timeout |
825 | */ | |
826 | int tipc_link_timeout(struct tipc_link *l, struct sk_buff_head *xmitq) | |
827 | { | |
c91522f8 YX |
828 | int mtyp = 0; |
829 | int rc = 0; | |
42b18f60 JPM |
830 | bool state = false; |
831 | bool probe = false; | |
832 | bool setup = false; | |
52666986 JPM |
833 | u16 bc_snt = l->bc_sndlink->snd_nxt - 1; |
834 | u16 bc_acked = l->bc_rcvlink->acked; | |
35c55c98 | 835 | struct tipc_mon_state *mstate = &l->mon_state; |
5045f7b9 | 836 | |
26574db0 TL |
837 | trace_tipc_link_timeout(l, TIPC_DUMP_NONE, " "); |
838 | trace_tipc_link_too_silent(l, TIPC_DUMP_ALL, " "); | |
662921cd JPM |
839 | switch (l->state) { |
840 | case LINK_ESTABLISHED: | |
841 | case LINK_SYNCHING: | |
42b18f60 | 842 | mtyp = STATE_MSG; |
35c55c98 JPM |
843 | link_profile_stats(l); |
844 | tipc_mon_get_state(l->net, l->addr, mstate, l->bearer_id); | |
845 | if (mstate->reset || (l->silent_intv_cnt > l->abort_limit)) | |
846 | return tipc_link_fsm_evt(l, LINK_FAILURE_EVT); | |
42b18f60 | 847 | state = bc_acked != bc_snt; |
35c55c98 JPM |
848 | state |= l->bc_rcvlink->rcv_unacked; |
849 | state |= l->rcv_unacked; | |
850 | state |= !skb_queue_empty(&l->transmq); | |
35c55c98 JPM |
851 | probe = mstate->probing; |
852 | probe |= l->silent_intv_cnt; | |
853 | if (probe || mstate->monitoring) | |
854 | l->silent_intv_cnt++; | |
6ef9dcb7 | 855 | probe |= !skb_queue_empty(&l->deferdq); |
16ad3f40 JM |
856 | if (l->snd_nxt == l->checkpoint) { |
857 | tipc_link_update_cwin(l, 0, 0); | |
858 | probe = true; | |
859 | } | |
860 | l->checkpoint = l->snd_nxt; | |
662921cd JPM |
861 | break; |
862 | case LINK_RESET: | |
42b18f60 JPM |
863 | setup = l->rst_cnt++ <= 4; |
864 | setup |= !(l->rst_cnt % 16); | |
5045f7b9 | 865 | mtyp = RESET_MSG; |
662921cd JPM |
866 | break; |
867 | case LINK_ESTABLISHING: | |
42b18f60 | 868 | setup = true; |
5045f7b9 | 869 | mtyp = ACTIVATE_MSG; |
662921cd | 870 | break; |
662921cd | 871 | case LINK_PEER_RESET: |
598411d7 | 872 | case LINK_RESETTING: |
662921cd JPM |
873 | case LINK_FAILINGOVER: |
874 | break; | |
875 | default: | |
876 | break; | |
5045f7b9 | 877 | } |
662921cd | 878 | |
42b18f60 | 879 | if (state || probe || setup) |
8d6e79d3 | 880 | tipc_link_build_proto_msg(l, mtyp, probe, 0, 0, 0, 0, xmitq); |
5045f7b9 | 881 | |
333ef69e JPM |
882 | return rc; |
883 | } | |
884 | ||
b97bf3fd | 885 | /** |
3127a020 | 886 | * link_schedule_user - schedule a message sender for wakeup after congestion |
365ad353 JPM |
887 | * @l: congested link |
888 | * @hdr: header of message that is being sent | |
50100a5e | 889 | * Create pseudo msg to send back to user when congestion abates |
b97bf3fd | 890 | */ |
365ad353 | 891 | static int link_schedule_user(struct tipc_link *l, struct tipc_msg *hdr) |
b97bf3fd | 892 | { |
365ad353 JPM |
893 | u32 dnode = tipc_own_addr(l->net); |
894 | u32 dport = msg_origport(hdr); | |
3127a020 JPM |
895 | struct sk_buff *skb; |
896 | ||
3127a020 JPM |
897 | /* Create and schedule wakeup pseudo message */ |
898 | skb = tipc_msg_create(SOCK_WAKEUP, 0, INT_H_SIZE, 0, | |
365ad353 | 899 | dnode, l->addr, dport, 0, 0); |
3127a020 | 900 | if (!skb) |
86704993 | 901 | return -ENOBUFS; |
365ad353 JPM |
902 | msg_set_dest_droppable(buf_msg(skb), true); |
903 | TIPC_SKB_CB(skb)->chain_imp = msg_importance(hdr); | |
904 | skb_queue_tail(&l->wakeupq, skb); | |
905 | l->stats.link_congs++; | |
26574db0 | 906 | trace_tipc_link_conges(l, TIPC_DUMP_ALL, "wakeup scheduled!"); |
3127a020 | 907 | return -ELINKCONG; |
b97bf3fd PL |
908 | } |
909 | ||
50100a5e JPM |
910 | /** |
911 | * link_prepare_wakeup - prepare users for wakeup after congestion | |
365ad353 JPM |
912 | * @l: congested link |
913 | * Wake up a number of waiting users, as permitted by available space | |
914 | * in the send queue | |
50100a5e | 915 | */ |
e064cce1 | 916 | static void link_prepare_wakeup(struct tipc_link *l) |
b97bf3fd | 917 | { |
7c5b4205 JM |
918 | struct sk_buff_head *wakeupq = &l->wakeupq; |
919 | struct sk_buff_head *inputq = l->inputq; | |
58d78b32 | 920 | struct sk_buff *skb, *tmp; |
7c5b4205 JM |
921 | struct sk_buff_head tmpq; |
922 | int avail[5] = {0,}; | |
923 | int imp = 0; | |
50100a5e | 924 | |
7c5b4205 JM |
925 | __skb_queue_head_init(&tmpq); |
926 | ||
927 | for (; imp <= TIPC_SYSTEM_IMPORTANCE; imp++) | |
928 | avail[imp] = l->backlog[imp].limit - l->backlog[imp].len; | |
929 | ||
930 | skb_queue_walk_safe(wakeupq, skb, tmp) { | |
1f66d161 | 931 | imp = TIPC_SKB_CB(skb)->chain_imp; |
7c5b4205 JM |
932 | if (avail[imp] <= 0) |
933 | continue; | |
934 | avail[imp]--; | |
935 | __skb_unlink(skb, wakeupq); | |
936 | __skb_queue_tail(&tmpq, skb); | |
b97bf3fd | 937 | } |
7c5b4205 JM |
938 | |
939 | spin_lock_bh(&inputq->lock); | |
940 | skb_queue_splice_tail(&tmpq, inputq); | |
941 | spin_unlock_bh(&inputq->lock); | |
942 | ||
b97bf3fd PL |
943 | } |
944 | ||
a34f8291 HM |
945 | /** |
946 | * tipc_link_set_skb_retransmit_time - set the time at which retransmission of | |
947 | * the given skb should be next attempted | |
948 | * @skb: skb to set a future retransmission time for | |
949 | * @l: link the skb will be transmitted on | |
950 | */ | |
951 | static void tipc_link_set_skb_retransmit_time(struct sk_buff *skb, | |
952 | struct tipc_link *l) | |
953 | { | |
954 | if (link_is_bc_sndlink(l)) | |
955 | TIPC_SKB_CB(skb)->nxt_retr = TIPC_BC_RETR_LIM; | |
956 | else | |
957 | TIPC_SKB_CB(skb)->nxt_retr = TIPC_UC_RETR_TIME; | |
958 | } | |
959 | ||
6e498158 | 960 | void tipc_link_reset(struct tipc_link *l) |
b97bf3fd | 961 | { |
a1f8dd34 | 962 | struct sk_buff_head list; |
e95584a8 | 963 | u32 imp; |
a1f8dd34 YX |
964 | |
965 | __skb_queue_head_init(&list); | |
966 | ||
7ea817f4 | 967 | l->in_session = false; |
f7a93780 TL |
968 | /* Force re-synch of peer session number before establishing */ |
969 | l->peer_session--; | |
e74a386d | 970 | l->session++; |
6e498158 | 971 | l->mtu = l->advertised_mtu; |
a1f8dd34 | 972 | |
3f32d0be | 973 | spin_lock_bh(&l->wakeupq.lock); |
a1f8dd34 YX |
974 | skb_queue_splice_init(&l->wakeupq, &list); |
975 | spin_unlock_bh(&l->wakeupq.lock); | |
976 | ||
3f32d0be | 977 | spin_lock_bh(&l->inputq->lock); |
a1f8dd34 | 978 | skb_queue_splice_init(&list, l->inputq); |
3f32d0be | 979 | spin_unlock_bh(&l->inputq->lock); |
3f32d0be | 980 | |
6e498158 JPM |
981 | __skb_queue_purge(&l->transmq); |
982 | __skb_queue_purge(&l->deferdq); | |
2af5ae37 | 983 | __skb_queue_purge(&l->backlogq); |
58ee86b8 | 984 | __skb_queue_purge(&l->failover_deferdq); |
e95584a8 TL |
985 | for (imp = 0; imp <= TIPC_SYSTEM_IMPORTANCE; imp++) { |
986 | l->backlog[imp].len = 0; | |
987 | l->backlog[imp].target_bskb = NULL; | |
988 | } | |
6e498158 | 989 | kfree_skb(l->reasm_buf); |
2320bcda | 990 | kfree_skb(l->reasm_tnlmsg); |
6e498158 JPM |
991 | kfree_skb(l->failover_reasm_skb); |
992 | l->reasm_buf = NULL; | |
2320bcda | 993 | l->reasm_tnlmsg = NULL; |
6e498158 JPM |
994 | l->failover_reasm_skb = NULL; |
995 | l->rcv_unacked = 0; | |
996 | l->snd_nxt = 1; | |
997 | l->rcv_nxt = 1; | |
9012de50 JM |
998 | l->snd_nxt_state = 1; |
999 | l->rcv_nxt_state = 1; | |
c1ab3f1d | 1000 | l->acked = 0; |
d7626b5a TL |
1001 | l->last_gap = 0; |
1002 | kfree(l->last_ga); | |
1003 | l->last_ga = NULL; | |
6e498158 | 1004 | l->silent_intv_cnt = 0; |
88e8ac70 | 1005 | l->rst_cnt = 0; |
52666986 | 1006 | l->bc_peer_is_up = false; |
35c55c98 | 1007 | memset(&l->mon_state, 0, sizeof(l->mon_state)); |
38206d59 | 1008 | tipc_link_reset_stats(l); |
b97bf3fd PL |
1009 | } |
1010 | ||
af9b028e JPM |
1011 | /** |
1012 | * tipc_link_xmit(): enqueue buffer list according to queue situation | |
d8141208 | 1013 | * @l: link to use |
af9b028e JPM |
1014 | * @list: chain of buffers containing message |
1015 | * @xmitq: returned list of packets to be sent by caller | |
1016 | * | |
365ad353 | 1017 | * Consumes the buffer chain. |
af9b028e | 1018 | * Messages at TIPC_SYSTEM_IMPORTANCE are always accepted |
86704993 | 1019 | * Return: 0 if success, or errno: -ELINKCONG, -EMSGSIZE or -ENOBUFS |
af9b028e JPM |
1020 | */ |
1021 | int tipc_link_xmit(struct tipc_link *l, struct sk_buff_head *list, | |
1022 | struct sk_buff_head *xmitq) | |
1023 | { | |
06e7c70c TL |
1024 | struct sk_buff_head *backlogq = &l->backlogq; |
1025 | struct sk_buff_head *transmq = &l->transmq; | |
1026 | struct sk_buff *skb, *_skb; | |
1027 | u16 bc_ack = l->bc_rcvlink->rcv_nxt - 1; | |
af9b028e JPM |
1028 | u16 ack = l->rcv_nxt - 1; |
1029 | u16 seqno = l->snd_nxt; | |
95901122 | 1030 | int pkt_cnt = skb_queue_len(list); |
fc1b6d6d | 1031 | unsigned int mss = tipc_link_mss(l); |
16ad3f40 | 1032 | unsigned int cwin = l->window; |
06e7c70c | 1033 | unsigned int mtu = l->mtu; |
b7741344 | 1034 | struct tipc_msg *hdr; |
06e7c70c | 1035 | bool new_bundle; |
365ad353 | 1036 | int rc = 0; |
b7741344 | 1037 | int imp; |
af9b028e | 1038 | |
b7741344 HL |
1039 | if (pkt_cnt <= 0) |
1040 | return 0; | |
1041 | ||
1042 | hdr = buf_msg(skb_peek(list)); | |
4952cd3e | 1043 | if (unlikely(msg_size(hdr) > mtu)) { |
2320bcda TL |
1044 | pr_warn("Too large msg, purging xmit list %d %d %d %d %d!\n", |
1045 | skb_queue_len(list), msg_user(hdr), | |
1046 | msg_type(hdr), msg_size(hdr), mtu); | |
e654f9f5 | 1047 | __skb_queue_purge(list); |
af9b028e | 1048 | return -EMSGSIZE; |
4952cd3e | 1049 | } |
af9b028e | 1050 | |
b7741344 | 1051 | imp = msg_importance(hdr); |
365ad353 JPM |
1052 | /* Allow oversubscription of one data msg per source at congestion */ |
1053 | if (unlikely(l->backlog[imp].len >= l->backlog[imp].limit)) { | |
1054 | if (imp == TIPC_SYSTEM_IMPORTANCE) { | |
1055 | pr_warn("%s<%s>, link overflow", link_rst_msg, l->name); | |
1056 | return -ENOBUFS; | |
1057 | } | |
1058 | rc = link_schedule_user(l, hdr); | |
1059 | } | |
1060 | ||
95901122 JPM |
1061 | if (pkt_cnt > 1) { |
1062 | l->stats.sent_fragmented++; | |
1063 | l->stats.sent_fragments += pkt_cnt; | |
1064 | } | |
1065 | ||
af9b028e | 1066 | /* Prepare each packet for sending, and add to relevant queue: */ |
06e7c70c | 1067 | while ((skb = __skb_dequeue(list))) { |
16ad3f40 | 1068 | if (likely(skb_queue_len(transmq) < cwin)) { |
06e7c70c TL |
1069 | hdr = buf_msg(skb); |
1070 | msg_set_seqno(hdr, seqno); | |
1071 | msg_set_ack(hdr, ack); | |
1072 | msg_set_bcast_ack(hdr, bc_ack); | |
af9b028e | 1073 | _skb = skb_clone(skb, GFP_ATOMIC); |
4952cd3e | 1074 | if (!_skb) { |
06e7c70c | 1075 | kfree_skb(skb); |
e654f9f5 | 1076 | __skb_queue_purge(list); |
86704993 | 1077 | return -ENOBUFS; |
4952cd3e | 1078 | } |
af9b028e | 1079 | __skb_queue_tail(transmq, skb); |
a34f8291 | 1080 | tipc_link_set_skb_retransmit_time(skb, l); |
af9b028e | 1081 | __skb_queue_tail(xmitq, _skb); |
c1ab3f1d | 1082 | TIPC_SKB_CB(skb)->ackers = l->ackers; |
af9b028e | 1083 | l->rcv_unacked = 0; |
95901122 | 1084 | l->stats.sent_pkts++; |
af9b028e JPM |
1085 | seqno++; |
1086 | continue; | |
1087 | } | |
06e7c70c | 1088 | if (tipc_msg_try_bundle(l->backlog[imp].target_bskb, &skb, |
fc1b6d6d | 1089 | mss, l->addr, &new_bundle)) { |
06e7c70c TL |
1090 | if (skb) { |
1091 | /* Keep a ref. to the skb for next try */ | |
1092 | l->backlog[imp].target_bskb = skb; | |
1093 | l->backlog[imp].len++; | |
1094 | __skb_queue_tail(backlogq, skb); | |
1095 | } else { | |
1096 | if (new_bundle) { | |
1097 | l->stats.sent_bundles++; | |
1098 | l->stats.sent_bundled++; | |
1099 | } | |
1100 | l->stats.sent_bundled++; | |
1101 | } | |
af9b028e JPM |
1102 | continue; |
1103 | } | |
e95584a8 | 1104 | l->backlog[imp].target_bskb = NULL; |
06e7c70c TL |
1105 | l->backlog[imp].len += (1 + skb_queue_len(list)); |
1106 | __skb_queue_tail(backlogq, skb); | |
af9b028e JPM |
1107 | skb_queue_splice_tail_init(list, backlogq); |
1108 | } | |
1109 | l->snd_nxt = seqno; | |
365ad353 | 1110 | return rc; |
af9b028e JPM |
1111 | } |
1112 | ||
16ad3f40 JM |
1113 | static void tipc_link_update_cwin(struct tipc_link *l, int released, |
1114 | bool retransmitted) | |
1115 | { | |
1116 | int bklog_len = skb_queue_len(&l->backlogq); | |
1117 | struct sk_buff_head *txq = &l->transmq; | |
1118 | int txq_len = skb_queue_len(txq); | |
1119 | u16 cwin = l->window; | |
1120 | ||
1121 | /* Enter fast recovery */ | |
1122 | if (unlikely(retransmitted)) { | |
1123 | l->ssthresh = max_t(u16, l->window / 2, 300); | |
edadedf1 | 1124 | l->window = min_t(u16, l->ssthresh, l->window); |
16ad3f40 JM |
1125 | return; |
1126 | } | |
1127 | /* Enter slow start */ | |
1128 | if (unlikely(!released)) { | |
1129 | l->ssthresh = max_t(u16, l->window / 2, 300); | |
1130 | l->window = l->min_win; | |
1131 | return; | |
1132 | } | |
1133 | /* Don't increase window if no pressure on the transmit queue */ | |
1134 | if (txq_len + bklog_len < cwin) | |
1135 | return; | |
1136 | ||
1137 | /* Don't increase window if there are holes the transmit queue */ | |
1138 | if (txq_len && l->snd_nxt - buf_seqno(skb_peek(txq)) != txq_len) | |
1139 | return; | |
1140 | ||
1141 | l->cong_acks += released; | |
1142 | ||
1143 | /* Slow start */ | |
1144 | if (cwin <= l->ssthresh) { | |
1145 | l->window = min_t(u16, cwin + released, l->max_win); | |
1146 | return; | |
1147 | } | |
1148 | /* Congestion avoidance */ | |
1149 | if (l->cong_acks < cwin) | |
1150 | return; | |
1151 | l->window = min_t(u16, ++cwin, l->max_win); | |
1152 | l->cong_acks = 0; | |
1153 | } | |
1154 | ||
e064cce1 Y |
1155 | static void tipc_link_advance_backlog(struct tipc_link *l, |
1156 | struct sk_buff_head *xmitq) | |
d999297c | 1157 | { |
16ad3f40 JM |
1158 | u16 bc_ack = l->bc_rcvlink->rcv_nxt - 1; |
1159 | struct sk_buff_head *txq = &l->transmq; | |
d999297c | 1160 | struct sk_buff *skb, *_skb; |
d999297c | 1161 | u16 ack = l->rcv_nxt - 1; |
16ad3f40 JM |
1162 | u16 seqno = l->snd_nxt; |
1163 | struct tipc_msg *hdr; | |
1164 | u16 cwin = l->window; | |
e95584a8 | 1165 | u32 imp; |
d999297c | 1166 | |
16ad3f40 | 1167 | while (skb_queue_len(txq) < cwin) { |
d999297c JPM |
1168 | skb = skb_peek(&l->backlogq); |
1169 | if (!skb) | |
1170 | break; | |
1171 | _skb = skb_clone(skb, GFP_ATOMIC); | |
1172 | if (!_skb) | |
1173 | break; | |
1174 | __skb_dequeue(&l->backlogq); | |
1175 | hdr = buf_msg(skb); | |
e95584a8 TL |
1176 | imp = msg_importance(hdr); |
1177 | l->backlog[imp].len--; | |
1178 | if (unlikely(skb == l->backlog[imp].target_bskb)) | |
1179 | l->backlog[imp].target_bskb = NULL; | |
d999297c | 1180 | __skb_queue_tail(&l->transmq, skb); |
a34f8291 | 1181 | tipc_link_set_skb_retransmit_time(skb, l); |
05572271 | 1182 | |
d999297c | 1183 | __skb_queue_tail(xmitq, _skb); |
c1ab3f1d | 1184 | TIPC_SKB_CB(skb)->ackers = l->ackers; |
d999297c | 1185 | msg_set_seqno(hdr, seqno); |
52666986 JPM |
1186 | msg_set_ack(hdr, ack); |
1187 | msg_set_bcast_ack(hdr, bc_ack); | |
d999297c | 1188 | l->rcv_unacked = 0; |
95901122 | 1189 | l->stats.sent_pkts++; |
d999297c JPM |
1190 | seqno++; |
1191 | } | |
1192 | l->snd_nxt = seqno; | |
1193 | } | |
1194 | ||
6a6b5c8b TL |
1195 | /** |
1196 | * link_retransmit_failure() - Detect repeated retransmit failures | |
1197 | * @l: tipc link sender | |
1198 | * @r: tipc link receiver (= l in case of unicast) | |
6a6b5c8b TL |
1199 | * @rc: returned code |
1200 | * | |
1201 | * Return: true if the repeated retransmit failures happens, otherwise | |
1202 | * false | |
1203 | */ | |
1204 | static bool link_retransmit_failure(struct tipc_link *l, struct tipc_link *r, | |
71204231 | 1205 | int *rc) |
d356eeba | 1206 | { |
6a6b5c8b TL |
1207 | struct sk_buff *skb = skb_peek(&l->transmq); |
1208 | struct tipc_msg *hdr; | |
1209 | ||
1210 | if (!skb) | |
1211 | return false; | |
6a6b5c8b | 1212 | |
71204231 TL |
1213 | if (!TIPC_SKB_CB(skb)->retr_cnt) |
1214 | return false; | |
6a6b5c8b | 1215 | |
71204231 | 1216 | if (!time_after(jiffies, TIPC_SKB_CB(skb)->retr_stamp + |
426071f1 | 1217 | msecs_to_jiffies(r->tolerance * 10))) |
71204231 TL |
1218 | return false; |
1219 | ||
1220 | hdr = buf_msg(skb); | |
1221 | if (link_is_bc_sndlink(l) && !less(r->acked, msg_seqno(hdr))) | |
1222 | return false; | |
6a6b5c8b | 1223 | |
71204231 TL |
1224 | pr_warn("Retransmission failure on link <%s>\n", l->name); |
1225 | link_print(l, "State of link "); | |
1226 | pr_info("Failed msg: usr %u, typ %u, len %u, err %u\n", | |
1227 | msg_user(hdr), msg_type(hdr), msg_size(hdr), msg_errcode(hdr)); | |
1228 | pr_info("sqno %u, prev: %x, dest: %x\n", | |
1229 | msg_seqno(hdr), msg_prevnode(hdr), msg_destnode(hdr)); | |
1230 | pr_info("retr_stamp %d, retr_cnt %d\n", | |
1231 | jiffies_to_msecs(TIPC_SKB_CB(skb)->retr_stamp), | |
1232 | TIPC_SKB_CB(skb)->retr_cnt); | |
1233 | ||
1234 | trace_tipc_list_dump(&l->transmq, true, "retrans failure!"); | |
1235 | trace_tipc_link_dump(l, TIPC_DUMP_NONE, "retrans failure!"); | |
1236 | trace_tipc_link_dump(r, TIPC_DUMP_NONE, "retrans failure!"); | |
1237 | ||
1238 | if (link_is_bc_sndlink(l)) { | |
1239 | r->state = LINK_RESET; | |
d7626b5a | 1240 | *rc |= TIPC_LINK_DOWN_EVT; |
71204231 | 1241 | } else { |
d7626b5a | 1242 | *rc |= tipc_link_fsm_evt(l, LINK_FAILURE_EVT); |
6a6b5c8b | 1243 | } |
52666986 | 1244 | |
71204231 | 1245 | return true; |
d356eeba AS |
1246 | } |
1247 | ||
c637c103 | 1248 | /* tipc_data_input - deliver data and name distr msgs to upper layer |
7ae934be | 1249 | * |
c637c103 | 1250 | * Consumes buffer if message is of right type |
7ae934be EH |
1251 | * Node lock must be held |
1252 | */ | |
52666986 | 1253 | static bool tipc_data_input(struct tipc_link *l, struct sk_buff *skb, |
9073fb8b | 1254 | struct sk_buff_head *inputq) |
7ae934be | 1255 | { |
399574d4 | 1256 | struct sk_buff_head *mc_inputq = l->bc_rcvlink->inputq; |
a853e4c6 JPM |
1257 | struct tipc_msg *hdr = buf_msg(skb); |
1258 | ||
1259 | switch (msg_user(hdr)) { | |
c637c103 JPM |
1260 | case TIPC_LOW_IMPORTANCE: |
1261 | case TIPC_MEDIUM_IMPORTANCE: | |
1262 | case TIPC_HIGH_IMPORTANCE: | |
1263 | case TIPC_CRITICAL_IMPORTANCE: | |
2f487712 | 1264 | if (unlikely(msg_in_group(hdr) || msg_mcast(hdr))) { |
399574d4 | 1265 | skb_queue_tail(mc_inputq, skb); |
a853e4c6 JPM |
1266 | return true; |
1267 | } | |
7f8901b7 | 1268 | fallthrough; |
2f487712 | 1269 | case CONN_MANAGER: |
36c0a9df | 1270 | skb_queue_tail(inputq, skb); |
c637c103 | 1271 | return true; |
399574d4 JM |
1272 | case GROUP_PROTOCOL: |
1273 | skb_queue_tail(mc_inputq, skb); | |
1274 | return true; | |
7ae934be | 1275 | case NAME_DISTRIBUTOR: |
52666986 JPM |
1276 | l->bc_rcvlink->state = LINK_ESTABLISHED; |
1277 | skb_queue_tail(l->namedq, skb); | |
c637c103 JPM |
1278 | return true; |
1279 | case MSG_BUNDLER: | |
dff29b1a | 1280 | case TUNNEL_PROTOCOL: |
c637c103 | 1281 | case MSG_FRAGMENTER: |
7ae934be | 1282 | case BCAST_PROTOCOL: |
c637c103 | 1283 | return false; |
1ef6f7c9 TL |
1284 | #ifdef CONFIG_TIPC_CRYPTO |
1285 | case MSG_CRYPTO: | |
6180c780 XL |
1286 | if (sysctl_tipc_key_exchange_enabled && |
1287 | TIPC_SKB_CB(skb)->decrypted) { | |
271351d2 XL |
1288 | tipc_crypto_msg_rcv(l->net, skb); |
1289 | return true; | |
1290 | } | |
1291 | fallthrough; | |
1ef6f7c9 | 1292 | #endif |
7ae934be | 1293 | default: |
c637c103 JPM |
1294 | pr_warn("Dropping received illegal msg type\n"); |
1295 | kfree_skb(skb); | |
7384b538 | 1296 | return true; |
f2219c32 | 1297 | } |
7ae934be | 1298 | } |
c637c103 JPM |
1299 | |
1300 | /* tipc_link_input - process packet that has passed link protocol check | |
1301 | * | |
1302 | * Consumes buffer | |
7ae934be | 1303 | */ |
9073fb8b | 1304 | static int tipc_link_input(struct tipc_link *l, struct sk_buff *skb, |
58ee86b8 TL |
1305 | struct sk_buff_head *inputq, |
1306 | struct sk_buff **reasm_skb) | |
7ae934be | 1307 | { |
6e498158 | 1308 | struct tipc_msg *hdr = buf_msg(skb); |
c637c103 | 1309 | struct sk_buff *iskb; |
9945e804 | 1310 | struct sk_buff_head tmpq; |
6e498158 | 1311 | int usr = msg_user(hdr); |
6e498158 | 1312 | int pos = 0; |
c637c103 | 1313 | |
6e498158 | 1314 | if (usr == MSG_BUNDLER) { |
9945e804 | 1315 | skb_queue_head_init(&tmpq); |
6e498158 JPM |
1316 | l->stats.recv_bundles++; |
1317 | l->stats.recv_bundled += msg_msgcnt(hdr); | |
c637c103 | 1318 | while (tipc_msg_extract(skb, &iskb, &pos)) |
9945e804 JPM |
1319 | tipc_data_input(l, iskb, &tmpq); |
1320 | tipc_skb_queue_splice_tail(&tmpq, inputq); | |
662921cd | 1321 | return 0; |
6e498158 JPM |
1322 | } else if (usr == MSG_FRAGMENTER) { |
1323 | l->stats.recv_fragments++; | |
1324 | if (tipc_buf_append(reasm_skb, &skb)) { | |
1325 | l->stats.recv_fragmented++; | |
9073fb8b | 1326 | tipc_data_input(l, skb, inputq); |
52666986 JPM |
1327 | } else if (!*reasm_skb && !link_is_bc_rcvlink(l)) { |
1328 | pr_warn_ratelimited("Unable to build fragment list\n"); | |
662921cd | 1329 | return tipc_link_fsm_evt(l, LINK_FAILURE_EVT); |
c637c103 | 1330 | } |
662921cd | 1331 | return 0; |
6e498158 | 1332 | } else if (usr == BCAST_PROTOCOL) { |
c72fa872 | 1333 | tipc_bcast_lock(l->net); |
52666986 | 1334 | tipc_link_bc_init_rcv(l->bc_rcvlink, hdr); |
c72fa872 | 1335 | tipc_bcast_unlock(l->net); |
6e498158 | 1336 | } |
58ee86b8 | 1337 | |
6e498158 | 1338 | kfree_skb(skb); |
662921cd | 1339 | return 0; |
7ae934be EH |
1340 | } |
1341 | ||
58ee86b8 TL |
1342 | /* tipc_link_tnl_rcv() - receive TUNNEL_PROTOCOL message, drop or process the |
1343 | * inner message along with the ones in the old link's | |
1344 | * deferdq | |
1345 | * @l: tunnel link | |
1346 | * @skb: TUNNEL_PROTOCOL message | |
1347 | * @inputq: queue to put messages ready for delivery | |
1348 | */ | |
1349 | static int tipc_link_tnl_rcv(struct tipc_link *l, struct sk_buff *skb, | |
1350 | struct sk_buff_head *inputq) | |
1351 | { | |
1352 | struct sk_buff **reasm_skb = &l->failover_reasm_skb; | |
2320bcda | 1353 | struct sk_buff **reasm_tnlmsg = &l->reasm_tnlmsg; |
58ee86b8 TL |
1354 | struct sk_buff_head *fdefq = &l->failover_deferdq; |
1355 | struct tipc_msg *hdr = buf_msg(skb); | |
1356 | struct sk_buff *iskb; | |
1357 | int ipos = 0; | |
1358 | int rc = 0; | |
1359 | u16 seqno; | |
1360 | ||
2320bcda TL |
1361 | if (msg_type(hdr) == SYNCH_MSG) { |
1362 | kfree_skb(skb); | |
1363 | return 0; | |
1364 | } | |
58ee86b8 | 1365 | |
2320bcda TL |
1366 | /* Not a fragment? */ |
1367 | if (likely(!msg_nof_fragms(hdr))) { | |
1368 | if (unlikely(!tipc_msg_extract(skb, &iskb, &ipos))) { | |
1369 | pr_warn_ratelimited("Unable to extract msg, defq: %d\n", | |
1370 | skb_queue_len(fdefq)); | |
1371 | return 0; | |
1372 | } | |
1373 | kfree_skb(skb); | |
1374 | } else { | |
1375 | /* Set fragment type for buf_append */ | |
1376 | if (msg_fragm_no(hdr) == 1) | |
1377 | msg_set_type(hdr, FIRST_FRAGMENT); | |
1378 | else if (msg_fragm_no(hdr) < msg_nof_fragms(hdr)) | |
1379 | msg_set_type(hdr, FRAGMENT); | |
1380 | else | |
1381 | msg_set_type(hdr, LAST_FRAGMENT); | |
1382 | ||
1383 | if (!tipc_buf_append(reasm_tnlmsg, &skb)) { | |
1384 | /* Successful but non-complete reassembly? */ | |
1385 | if (*reasm_tnlmsg || link_is_bc_rcvlink(l)) | |
1386 | return 0; | |
1387 | pr_warn_ratelimited("Unable to reassemble tunnel msg\n"); | |
1388 | return tipc_link_fsm_evt(l, LINK_FAILURE_EVT); | |
1389 | } | |
1390 | iskb = skb; | |
58ee86b8 TL |
1391 | } |
1392 | ||
1393 | do { | |
1394 | seqno = buf_seqno(iskb); | |
58ee86b8 TL |
1395 | if (unlikely(less(seqno, l->drop_point))) { |
1396 | kfree_skb(iskb); | |
1397 | continue; | |
1398 | } | |
58ee86b8 TL |
1399 | if (unlikely(seqno != l->drop_point)) { |
1400 | __tipc_skb_queue_sorted(fdefq, seqno, iskb); | |
1401 | continue; | |
1402 | } | |
1403 | ||
1404 | l->drop_point++; | |
58ee86b8 TL |
1405 | if (!tipc_data_input(l, iskb, inputq)) |
1406 | rc |= tipc_link_input(l, iskb, inputq, reasm_skb); | |
1407 | if (unlikely(rc)) | |
1408 | break; | |
1409 | } while ((iskb = __tipc_skb_dequeue(fdefq, l->drop_point))); | |
1410 | ||
58ee86b8 TL |
1411 | return rc; |
1412 | } | |
1413 | ||
d7626b5a TL |
1414 | /** |
1415 | * tipc_get_gap_ack_blks - get Gap ACK blocks from PROTOCOL/STATE_MSG | |
1416 | * @ga: returned pointer to the Gap ACK blocks if any | |
1417 | * @l: the tipc link | |
1418 | * @hdr: the PROTOCOL/STATE_MSG header | |
1419 | * @uc: desired Gap ACK blocks type, i.e. unicast (= 1) or broadcast (= 0) | |
1420 | * | |
1421 | * Return: the total Gap ACK blocks size | |
1422 | */ | |
1423 | u16 tipc_get_gap_ack_blks(struct tipc_gap_ack_blks **ga, struct tipc_link *l, | |
1424 | struct tipc_msg *hdr, bool uc) | |
1425 | { | |
1426 | struct tipc_gap_ack_blks *p; | |
1427 | u16 sz = 0; | |
1428 | ||
1429 | /* Does peer support the Gap ACK blocks feature? */ | |
1430 | if (l->peer_caps & TIPC_GAP_ACK_BLOCK) { | |
1431 | p = (struct tipc_gap_ack_blks *)msg_data(hdr); | |
1432 | sz = ntohs(p->len); | |
1433 | /* Sanity check */ | |
2506a917 | 1434 | if (sz == struct_size(p, gacks, size_add(p->ugack_cnt, p->bgack_cnt))) { |
d7626b5a TL |
1435 | /* Good, check if the desired type exists */ |
1436 | if ((uc && p->ugack_cnt) || (!uc && p->bgack_cnt)) | |
1437 | goto ok; | |
1438 | /* Backward compatible: peer might not support bc, but uc? */ | |
e034c6d2 | 1439 | } else if (uc && sz == struct_size(p, gacks, p->ugack_cnt)) { |
d7626b5a TL |
1440 | if (p->ugack_cnt) { |
1441 | p->bgack_cnt = 0; | |
1442 | goto ok; | |
1443 | } | |
1444 | } | |
d999297c | 1445 | } |
d7626b5a TL |
1446 | /* Other cases: ignore! */ |
1447 | p = NULL; | |
1448 | ||
1449 | ok: | |
1450 | *ga = p; | |
1451 | return sz; | |
d999297c JPM |
1452 | } |
1453 | ||
d7626b5a TL |
1454 | static u8 __tipc_build_gap_ack_blks(struct tipc_gap_ack_blks *ga, |
1455 | struct tipc_link *l, u8 start_index) | |
9195948f | 1456 | { |
d7626b5a | 1457 | struct tipc_gap_ack *gacks = &ga->gacks[start_index]; |
9195948f | 1458 | struct sk_buff *skb = skb_peek(&l->deferdq); |
d7626b5a | 1459 | u16 expect, seqno = 0; |
9195948f TL |
1460 | u8 n = 0; |
1461 | ||
d7626b5a TL |
1462 | if (!skb) |
1463 | return 0; | |
9195948f TL |
1464 | |
1465 | expect = buf_seqno(skb); | |
1466 | skb_queue_walk(&l->deferdq, skb) { | |
1467 | seqno = buf_seqno(skb); | |
1468 | if (unlikely(more(seqno, expect))) { | |
d7626b5a TL |
1469 | gacks[n].ack = htons(expect - 1); |
1470 | gacks[n].gap = htons(seqno - expect); | |
1471 | if (++n >= MAX_GAP_ACK_BLKS / 2) { | |
d7626b5a | 1472 | pr_info_ratelimited("Gacks on %s: %d, ql: %d!\n", |
03b6fefd | 1473 | l->name, n, |
d7626b5a TL |
1474 | skb_queue_len(&l->deferdq)); |
1475 | return n; | |
9195948f TL |
1476 | } |
1477 | } else if (unlikely(less(seqno, expect))) { | |
1478 | pr_warn("Unexpected skb in deferdq!\n"); | |
1479 | continue; | |
1480 | } | |
1481 | expect = seqno + 1; | |
1482 | } | |
1483 | ||
1484 | /* last block */ | |
d7626b5a TL |
1485 | gacks[n].ack = htons(seqno); |
1486 | gacks[n].gap = 0; | |
9195948f | 1487 | n++; |
d7626b5a TL |
1488 | return n; |
1489 | } | |
9195948f | 1490 | |
d7626b5a TL |
1491 | /* tipc_build_gap_ack_blks - build Gap ACK blocks |
1492 | * @l: tipc unicast link | |
1493 | * @hdr: the tipc message buffer to store the Gap ACK blocks after built | |
1494 | * | |
1495 | * The function builds Gap ACK blocks for both the unicast & broadcast receiver | |
1496 | * links of a certain peer, the buffer after built has the network data format | |
1497 | * as found at the struct tipc_gap_ack_blks definition. | |
1498 | * | |
1499 | * returns the actual allocated memory size | |
1500 | */ | |
1501 | static u16 tipc_build_gap_ack_blks(struct tipc_link *l, struct tipc_msg *hdr) | |
1502 | { | |
1503 | struct tipc_link *bcl = l->bc_rcvlink; | |
1504 | struct tipc_gap_ack_blks *ga; | |
1505 | u16 len; | |
1506 | ||
1507 | ga = (struct tipc_gap_ack_blks *)msg_data(hdr); | |
1508 | ||
1509 | /* Start with broadcast link first */ | |
1510 | tipc_bcast_lock(bcl->net); | |
1511 | msg_set_bcast_ack(hdr, bcl->rcv_nxt - 1); | |
1512 | msg_set_bc_gap(hdr, link_bc_rcv_gap(bcl)); | |
1513 | ga->bgack_cnt = __tipc_build_gap_ack_blks(ga, bcl, 0); | |
1514 | tipc_bcast_unlock(bcl->net); | |
1515 | ||
1516 | /* Now for unicast link, but an explicit NACK only (???) */ | |
1517 | ga->ugack_cnt = (msg_seq_gap(hdr)) ? | |
1518 | __tipc_build_gap_ack_blks(ga, l, ga->bgack_cnt) : 0; | |
1519 | ||
1520 | /* Total len */ | |
2506a917 | 1521 | len = struct_size(ga, gacks, size_add(ga->bgack_cnt, ga->ugack_cnt)); |
9195948f | 1522 | ga->len = htons(len); |
9195948f TL |
1523 | return len; |
1524 | } | |
1525 | ||
1526 | /* tipc_link_advance_transmq - advance TIPC link transmq queue by releasing | |
1527 | * acked packets, also doing retransmissions if | |
1528 | * gaps found | |
1529 | * @l: tipc link with transmq queue to be advanced | |
d7626b5a | 1530 | * @r: tipc link "receiver" i.e. in case of broadcast (= "l" if unicast) |
9195948f TL |
1531 | * @acked: seqno of last packet acked by peer without any gaps before |
1532 | * @gap: # of gap packets | |
1533 | * @ga: buffer pointer to Gap ACK blocks from peer | |
1534 | * @xmitq: queue for accumulating the retransmitted packets if any | |
d7626b5a TL |
1535 | * @retransmitted: returned boolean value if a retransmission is really issued |
1536 | * @rc: returned code e.g. TIPC_LINK_DOWN_EVT if a repeated retransmit failures | |
1537 | * happens (- unlikely case) | |
6a6b5c8b | 1538 | * |
d7626b5a | 1539 | * Return: the number of packets released from the link transmq |
9195948f | 1540 | */ |
d7626b5a TL |
1541 | static int tipc_link_advance_transmq(struct tipc_link *l, struct tipc_link *r, |
1542 | u16 acked, u16 gap, | |
6a6b5c8b | 1543 | struct tipc_gap_ack_blks *ga, |
d7626b5a TL |
1544 | struct sk_buff_head *xmitq, |
1545 | bool *retransmitted, int *rc) | |
9195948f | 1546 | { |
d7626b5a TL |
1547 | struct tipc_gap_ack_blks *last_ga = r->last_ga, *this_ga = NULL; |
1548 | struct tipc_gap_ack *gacks = NULL; | |
9195948f TL |
1549 | struct sk_buff *skb, *_skb, *tmp; |
1550 | struct tipc_msg *hdr; | |
d7626b5a TL |
1551 | u32 qlen = skb_queue_len(&l->transmq); |
1552 | u16 nacked = acked, ngap = gap, gack_cnt = 0; | |
9195948f TL |
1553 | u16 bc_ack = l->bc_rcvlink->rcv_nxt - 1; |
1554 | u16 ack = l->rcv_nxt - 1; | |
6a6b5c8b | 1555 | u16 seqno, n = 0; |
d7626b5a TL |
1556 | u16 end = r->acked, start = end, offset = r->last_gap; |
1557 | u16 si = (last_ga) ? last_ga->start_index : 0; | |
1558 | bool is_uc = !link_is_bc_sndlink(l); | |
1559 | bool bc_has_acked = false; | |
1560 | ||
c6ed7a5c TL |
1561 | trace_tipc_link_retrans(r, acked + 1, acked + gap, &l->transmq); |
1562 | ||
d7626b5a TL |
1563 | /* Determine Gap ACK blocks if any for the particular link */ |
1564 | if (ga && is_uc) { | |
1565 | /* Get the Gap ACKs, uc part */ | |
1566 | gack_cnt = ga->ugack_cnt; | |
1567 | gacks = &ga->gacks[ga->bgack_cnt]; | |
1568 | } else if (ga) { | |
1569 | /* Copy the Gap ACKs, bc part, for later renewal if needed */ | |
e034c6d2 | 1570 | this_ga = kmemdup(ga, struct_size(ga, gacks, ga->bgack_cnt), |
d7626b5a TL |
1571 | GFP_ATOMIC); |
1572 | if (likely(this_ga)) { | |
1573 | this_ga->start_index = 0; | |
1574 | /* Start with the bc Gap ACKs */ | |
1575 | gack_cnt = this_ga->bgack_cnt; | |
1576 | gacks = &this_ga->gacks[0]; | |
1577 | } else { | |
1578 | /* Hmm, we can get in trouble..., simply ignore it */ | |
1579 | pr_warn_ratelimited("Ignoring bc Gap ACKs, no memory\n"); | |
1580 | } | |
1581 | } | |
6a6b5c8b | 1582 | |
d7626b5a | 1583 | /* Advance the link transmq */ |
9195948f TL |
1584 | skb_queue_walk_safe(&l->transmq, skb, tmp) { |
1585 | seqno = buf_seqno(skb); | |
1586 | ||
1587 | next_gap_ack: | |
d7626b5a TL |
1588 | if (less_eq(seqno, nacked)) { |
1589 | if (is_uc) | |
1590 | goto release; | |
1591 | /* Skip packets peer has already acked */ | |
1592 | if (!more(seqno, r->acked)) | |
1593 | continue; | |
1594 | /* Get the next of last Gap ACK blocks */ | |
1595 | while (more(seqno, end)) { | |
1596 | if (!last_ga || si >= last_ga->bgack_cnt) | |
1597 | break; | |
1598 | start = end + offset + 1; | |
1599 | end = ntohs(last_ga->gacks[si].ack); | |
1600 | offset = ntohs(last_ga->gacks[si].gap); | |
1601 | si++; | |
1602 | WARN_ONCE(more(start, end) || | |
1603 | (!offset && | |
1604 | si < last_ga->bgack_cnt) || | |
1605 | si > MAX_GAP_ACK_BLKS, | |
1606 | "Corrupted Gap ACK: %d %d %d %d %d\n", | |
1607 | start, end, offset, si, | |
1608 | last_ga->bgack_cnt); | |
1609 | } | |
1610 | /* Check against the last Gap ACK block */ | |
f9bff0e3 | 1611 | if (tipc_in_range(seqno, start, end)) |
d7626b5a TL |
1612 | continue; |
1613 | /* Update/release the packet peer is acking */ | |
1614 | bc_has_acked = true; | |
1615 | if (--TIPC_SKB_CB(skb)->ackers) | |
1616 | continue; | |
1617 | release: | |
9195948f TL |
1618 | /* release skb */ |
1619 | __skb_unlink(skb, &l->transmq); | |
1620 | kfree_skb(skb); | |
d7626b5a TL |
1621 | } else if (less_eq(seqno, nacked + ngap)) { |
1622 | /* First gap: check if repeated retrans failures? */ | |
1623 | if (unlikely(seqno == acked + 1 && | |
1624 | link_retransmit_failure(l, r, rc))) { | |
1625 | /* Ignore this bc Gap ACKs if any */ | |
1626 | kfree(this_ga); | |
1627 | this_ga = NULL; | |
1628 | break; | |
1629 | } | |
71204231 | 1630 | /* retransmit skb if unrestricted*/ |
382f598f TL |
1631 | if (time_before(jiffies, TIPC_SKB_CB(skb)->nxt_retr)) |
1632 | continue; | |
a34f8291 | 1633 | tipc_link_set_skb_retransmit_time(skb, l); |
fc1b6d6d | 1634 | _skb = pskb_copy(skb, GFP_ATOMIC); |
9195948f TL |
1635 | if (!_skb) |
1636 | continue; | |
1637 | hdr = buf_msg(_skb); | |
1638 | msg_set_ack(hdr, ack); | |
1639 | msg_set_bcast_ack(hdr, bc_ack); | |
1640 | _skb->priority = TC_PRIO_CONTROL; | |
1641 | __skb_queue_tail(xmitq, _skb); | |
1642 | l->stats.retransmitted++; | |
03b6fefd TL |
1643 | if (!is_uc) |
1644 | r->stats.retransmitted++; | |
d7626b5a | 1645 | *retransmitted = true; |
71204231 TL |
1646 | /* Increase actual retrans counter & mark first time */ |
1647 | if (!TIPC_SKB_CB(skb)->retr_cnt++) | |
1648 | TIPC_SKB_CB(skb)->retr_stamp = jiffies; | |
9195948f TL |
1649 | } else { |
1650 | /* retry with Gap ACK blocks if any */ | |
d7626b5a | 1651 | if (n >= gack_cnt) |
9195948f | 1652 | break; |
d7626b5a TL |
1653 | nacked = ntohs(gacks[n].ack); |
1654 | ngap = ntohs(gacks[n].gap); | |
9195948f TL |
1655 | n++; |
1656 | goto next_gap_ack; | |
1657 | } | |
1658 | } | |
d7626b5a TL |
1659 | |
1660 | /* Renew last Gap ACK blocks for bc if needed */ | |
1661 | if (bc_has_acked) { | |
1662 | if (this_ga) { | |
1663 | kfree(last_ga); | |
1664 | r->last_ga = this_ga; | |
1665 | r->last_gap = gap; | |
1666 | } else if (last_ga) { | |
1667 | if (less(acked, start)) { | |
1668 | si--; | |
1669 | offset = start - acked - 1; | |
1670 | } else if (less(acked, end)) { | |
1671 | acked = end; | |
1672 | } | |
1673 | if (si < last_ga->bgack_cnt) { | |
1674 | last_ga->start_index = si; | |
1675 | r->last_gap = offset; | |
1676 | } else { | |
1677 | kfree(last_ga); | |
1678 | r->last_ga = NULL; | |
1679 | r->last_gap = 0; | |
1680 | } | |
1681 | } else { | |
1682 | r->last_gap = 0; | |
1683 | } | |
1684 | r->acked = acked; | |
1685 | } else { | |
1686 | kfree(this_ga); | |
1687 | } | |
1688 | ||
1689 | return qlen - skb_queue_len(&l->transmq); | |
9195948f TL |
1690 | } |
1691 | ||
34b9cd64 | 1692 | /* tipc_link_build_state_msg: prepare link state message for transmission |
52666986 JPM |
1693 | * |
1694 | * Note that sending of broadcast ack is coordinated among nodes, to reduce | |
1695 | * risk of ack storms towards the sender | |
f9aa358a | 1696 | */ |
34b9cd64 | 1697 | int tipc_link_build_state_msg(struct tipc_link *l, struct sk_buff_head *xmitq) |
f9aa358a | 1698 | { |
52666986 JPM |
1699 | if (!l) |
1700 | return 0; | |
1701 | ||
1702 | /* Broadcast ACK must be sent via a unicast link => defer to caller */ | |
1703 | if (link_is_bc_rcvlink(l)) { | |
e74a386d | 1704 | if (((l->rcv_nxt ^ tipc_own_addr(l->net)) & 0xf) != 0xf) |
52666986 JPM |
1705 | return 0; |
1706 | l->rcv_unacked = 0; | |
02d11ca2 JPM |
1707 | |
1708 | /* Use snd_nxt to store peer's snd_nxt in broadcast rcv link */ | |
1709 | l->snd_nxt = l->rcv_nxt; | |
1710 | return TIPC_LINK_SND_STATE; | |
52666986 | 1711 | } |
52666986 | 1712 | /* Unicast ACK */ |
f9aa358a JPM |
1713 | l->rcv_unacked = 0; |
1714 | l->stats.sent_acks++; | |
8d6e79d3 | 1715 | tipc_link_build_proto_msg(l, STATE_MSG, 0, 0, 0, 0, 0, xmitq); |
52666986 | 1716 | return 0; |
f9aa358a JPM |
1717 | } |
1718 | ||
282b3a05 JPM |
1719 | /* tipc_link_build_reset_msg: prepare link RESET or ACTIVATE message |
1720 | */ | |
1721 | void tipc_link_build_reset_msg(struct tipc_link *l, struct sk_buff_head *xmitq) | |
1722 | { | |
1723 | int mtyp = RESET_MSG; | |
634696b1 | 1724 | struct sk_buff *skb; |
282b3a05 JPM |
1725 | |
1726 | if (l->state == LINK_ESTABLISHING) | |
1727 | mtyp = ACTIVATE_MSG; | |
1728 | ||
8d6e79d3 | 1729 | tipc_link_build_proto_msg(l, mtyp, 0, 0, 0, 0, 0, xmitq); |
634696b1 JPM |
1730 | |
1731 | /* Inform peer that this endpoint is going down if applicable */ | |
1732 | skb = skb_peek_tail(xmitq); | |
1733 | if (skb && (l->state == LINK_RESET)) | |
1734 | msg_set_peer_stopping(buf_msg(skb), 1); | |
282b3a05 JPM |
1735 | } |
1736 | ||
f9aa358a | 1737 | /* tipc_link_build_nack_msg: prepare link nack message for transmission |
e0a05ebe JPM |
1738 | * Note that sending of broadcast NACK is coordinated among nodes, to |
1739 | * reduce the risk of NACK storms towards the sender | |
f9aa358a | 1740 | */ |
e0a05ebe JPM |
1741 | static int tipc_link_build_nack_msg(struct tipc_link *l, |
1742 | struct sk_buff_head *xmitq) | |
f9aa358a JPM |
1743 | { |
1744 | u32 def_cnt = ++l->stats.deferred_recv; | |
02288248 JM |
1745 | struct sk_buff_head *dfq = &l->deferdq; |
1746 | u32 defq_len = skb_queue_len(dfq); | |
e0a05ebe | 1747 | int match1, match2; |
f9aa358a | 1748 | |
e0a05ebe JPM |
1749 | if (link_is_bc_rcvlink(l)) { |
1750 | match1 = def_cnt & 0xf; | |
1751 | match2 = tipc_own_addr(l->net) & 0xf; | |
1752 | if (match1 == match2) | |
1753 | return TIPC_LINK_SND_STATE; | |
1754 | return 0; | |
1755 | } | |
52666986 | 1756 | |
02288248 JM |
1757 | if (defq_len >= 3 && !((defq_len - 3) % 16)) { |
1758 | u16 rcvgap = buf_seqno(skb_peek(dfq)) - l->rcv_nxt; | |
1759 | ||
1760 | tipc_link_build_proto_msg(l, STATE_MSG, 0, 0, | |
1761 | rcvgap, 0, 0, xmitq); | |
1762 | } | |
e0a05ebe | 1763 | return 0; |
f9aa358a JPM |
1764 | } |
1765 | ||
d999297c | 1766 | /* tipc_link_rcv - process TIPC packets/messages arriving from off-node |
f9aa358a | 1767 | * @l: the link that should handle the message |
d999297c JPM |
1768 | * @skb: TIPC packet |
1769 | * @xmitq: queue to place packets to be sent after this call | |
1770 | */ | |
1771 | int tipc_link_rcv(struct tipc_link *l, struct sk_buff *skb, | |
1772 | struct sk_buff_head *xmitq) | |
1773 | { | |
f9aa358a | 1774 | struct sk_buff_head *defq = &l->deferdq; |
382f598f | 1775 | struct tipc_msg *hdr = buf_msg(skb); |
81204c49 | 1776 | u16 seqno, rcv_nxt, win_lim; |
16ad3f40 | 1777 | int released = 0; |
d999297c JPM |
1778 | int rc = 0; |
1779 | ||
382f598f TL |
1780 | /* Verify and update link state */ |
1781 | if (unlikely(msg_user(hdr) == LINK_PROTOCOL)) | |
1782 | return tipc_link_proto_rcv(l, skb, xmitq); | |
1783 | ||
1784 | /* Don't send probe at next timeout expiration */ | |
1785 | l->silent_intv_cnt = 0; | |
1786 | ||
f9aa358a | 1787 | do { |
d999297c | 1788 | hdr = buf_msg(skb); |
f9aa358a JPM |
1789 | seqno = msg_seqno(hdr); |
1790 | rcv_nxt = l->rcv_nxt; | |
81204c49 | 1791 | win_lim = rcv_nxt + TIPC_MAX_LINK_WIN; |
d999297c | 1792 | |
662921cd | 1793 | if (unlikely(!link_is_up(l))) { |
73f646ce JPM |
1794 | if (l->state == LINK_ESTABLISHING) |
1795 | rc = TIPC_LINK_UP_EVT; | |
16ad3f40 JM |
1796 | kfree_skb(skb); |
1797 | break; | |
d999297c JPM |
1798 | } |
1799 | ||
81204c49 JPM |
1800 | /* Drop if outside receive window */ |
1801 | if (unlikely(less(seqno, rcv_nxt) || more(seqno, win_lim))) { | |
1802 | l->stats.duplicates++; | |
16ad3f40 JM |
1803 | kfree_skb(skb); |
1804 | break; | |
d999297c | 1805 | } |
d7626b5a TL |
1806 | released += tipc_link_advance_transmq(l, l, msg_ack(hdr), 0, |
1807 | NULL, NULL, NULL, NULL); | |
d999297c | 1808 | |
81204c49 JPM |
1809 | /* Defer delivery if sequence gap */ |
1810 | if (unlikely(seqno != rcv_nxt)) { | |
03b6fefd TL |
1811 | if (!__tipc_skb_queue_sorted(defq, seqno, skb)) |
1812 | l->stats.duplicates++; | |
e0a05ebe | 1813 | rc |= tipc_link_build_nack_msg(l, xmitq); |
f9aa358a | 1814 | break; |
d999297c JPM |
1815 | } |
1816 | ||
81204c49 | 1817 | /* Deliver packet */ |
d999297c | 1818 | l->rcv_nxt++; |
95901122 | 1819 | l->stats.recv_pkts++; |
58ee86b8 TL |
1820 | |
1821 | if (unlikely(msg_user(hdr) == TUNNEL_PROTOCOL)) | |
1822 | rc |= tipc_link_tnl_rcv(l, skb, l->inputq); | |
1823 | else if (!tipc_data_input(l, skb, l->inputq)) | |
1824 | rc |= tipc_link_input(l, skb, l->inputq, &l->reasm_buf); | |
f9aa358a | 1825 | if (unlikely(++l->rcv_unacked >= TIPC_MIN_LINK_WIN)) |
34b9cd64 | 1826 | rc |= tipc_link_build_state_msg(l, xmitq); |
02d11ca2 | 1827 | if (unlikely(rc & ~TIPC_LINK_SND_STATE)) |
52666986 | 1828 | break; |
382f598f | 1829 | } while ((skb = __tipc_skb_dequeue(defq, l->rcv_nxt))); |
f9aa358a | 1830 | |
16ad3f40 JM |
1831 | /* Forward queues and wake up waiting users */ |
1832 | if (released) { | |
1833 | tipc_link_update_cwin(l, released, 0); | |
1834 | tipc_link_advance_backlog(l, xmitq); | |
1835 | if (unlikely(!skb_queue_empty(&l->wakeupq))) | |
1836 | link_prepare_wakeup(l); | |
1837 | } | |
d999297c JPM |
1838 | return rc; |
1839 | } | |
1840 | ||
426cc2b8 | 1841 | static void tipc_link_build_proto_msg(struct tipc_link *l, int mtyp, bool probe, |
8d6e79d3 JM |
1842 | bool probe_reply, u16 rcvgap, |
1843 | int tolerance, int priority, | |
426cc2b8 JPM |
1844 | struct sk_buff_head *xmitq) |
1845 | { | |
03b6fefd TL |
1846 | struct tipc_mon_state *mstate = &l->mon_state; |
1847 | struct sk_buff_head *dfq = &l->deferdq; | |
02d11ca2 | 1848 | struct tipc_link *bcl = l->bc_rcvlink; |
e74a386d | 1849 | struct tipc_msg *hdr; |
03b6fefd | 1850 | struct sk_buff *skb; |
02d11ca2 | 1851 | bool node_up = link_is_up(bcl); |
03b6fefd | 1852 | u16 glen = 0, bc_rcvgap = 0; |
35c55c98 JPM |
1853 | int dlen = 0; |
1854 | void *data; | |
426cc2b8 JPM |
1855 | |
1856 | /* Don't send protocol message during reset or link failover */ | |
662921cd | 1857 | if (tipc_link_is_blocked(l)) |
426cc2b8 JPM |
1858 | return; |
1859 | ||
e74a386d JPM |
1860 | if (!tipc_link_is_up(l) && (mtyp == STATE_MSG)) |
1861 | return; | |
1862 | ||
02288248 | 1863 | if ((probe || probe_reply) && !skb_queue_empty(dfq)) |
e74a386d JPM |
1864 | rcvgap = buf_seqno(skb_peek(dfq)) - l->rcv_nxt; |
1865 | ||
1866 | skb = tipc_msg_create(LINK_PROTOCOL, mtyp, INT_H_SIZE, | |
9195948f TL |
1867 | tipc_max_domain_size + MAX_GAP_ACK_BLKS_SZ, |
1868 | l->addr, tipc_own_addr(l->net), 0, 0, 0); | |
e74a386d JPM |
1869 | if (!skb) |
1870 | return; | |
1871 | ||
1872 | hdr = buf_msg(skb); | |
35c55c98 | 1873 | data = msg_data(hdr); |
e74a386d JPM |
1874 | msg_set_session(hdr, l->session); |
1875 | msg_set_bearer_id(hdr, l->bearer_id); | |
426cc2b8 | 1876 | msg_set_net_plane(hdr, l->net_plane); |
52666986 JPM |
1877 | msg_set_next_sent(hdr, l->snd_nxt); |
1878 | msg_set_ack(hdr, l->rcv_nxt - 1); | |
02d11ca2 | 1879 | msg_set_bcast_ack(hdr, bcl->rcv_nxt - 1); |
06bd2b1e | 1880 | msg_set_bc_ack_invalid(hdr, !node_up); |
52666986 | 1881 | msg_set_last_bcast(hdr, l->bc_sndlink->snd_nxt - 1); |
426cc2b8 JPM |
1882 | msg_set_link_tolerance(hdr, tolerance); |
1883 | msg_set_linkprio(hdr, priority); | |
1884 | msg_set_redundant_link(hdr, node_up); | |
1885 | msg_set_seq_gap(hdr, 0); | |
52666986 | 1886 | msg_set_seqno(hdr, l->snd_nxt + U16_MAX / 2); |
426cc2b8 JPM |
1887 | |
1888 | if (mtyp == STATE_MSG) { | |
9012de50 JM |
1889 | if (l->peer_caps & TIPC_LINK_PROTO_SEQNO) |
1890 | msg_set_seqno(hdr, l->snd_nxt_state++); | |
e74a386d | 1891 | msg_set_seq_gap(hdr, rcvgap); |
03b6fefd TL |
1892 | bc_rcvgap = link_bc_rcv_gap(bcl); |
1893 | msg_set_bc_gap(hdr, bc_rcvgap); | |
426cc2b8 | 1894 | msg_set_probe(hdr, probe); |
8d6e79d3 | 1895 | msg_set_is_keepalive(hdr, probe || probe_reply); |
9195948f | 1896 | if (l->peer_caps & TIPC_GAP_ACK_BLOCK) |
d7626b5a | 1897 | glen = tipc_build_gap_ack_blks(l, hdr); |
9195948f TL |
1898 | tipc_mon_prep(l->net, data + glen, &dlen, mstate, l->bearer_id); |
1899 | msg_set_size(hdr, INT_H_SIZE + glen + dlen); | |
1900 | skb_trim(skb, INT_H_SIZE + glen + dlen); | |
426cc2b8 | 1901 | l->stats.sent_states++; |
52666986 | 1902 | l->rcv_unacked = 0; |
426cc2b8 JPM |
1903 | } else { |
1904 | /* RESET_MSG or ACTIVATE_MSG */ | |
91986ee1 TL |
1905 | if (mtyp == ACTIVATE_MSG) { |
1906 | msg_set_dest_session_valid(hdr, 1); | |
1907 | msg_set_dest_session(hdr, l->peer_session); | |
1908 | } | |
426cc2b8 | 1909 | msg_set_max_pkt(hdr, l->advertised_mtu); |
35c55c98 JPM |
1910 | strcpy(data, l->if_name); |
1911 | msg_set_size(hdr, INT_H_SIZE + TIPC_MAX_IF_NAME); | |
1912 | skb_trim(skb, INT_H_SIZE + TIPC_MAX_IF_NAME); | |
426cc2b8 | 1913 | } |
e74a386d JPM |
1914 | if (probe) |
1915 | l->stats.sent_probes++; | |
1916 | if (rcvgap) | |
1917 | l->stats.sent_nacks++; | |
03b6fefd TL |
1918 | if (bc_rcvgap) |
1919 | bcl->stats.sent_nacks++; | |
426cc2b8 | 1920 | skb->priority = TC_PRIO_CONTROL; |
6e498158 | 1921 | __skb_queue_tail(xmitq, skb); |
26574db0 | 1922 | trace_tipc_proto_build(skb, false, l->name); |
b97bf3fd PL |
1923 | } |
1924 | ||
c140eb16 LDC |
1925 | void tipc_link_create_dummy_tnl_msg(struct tipc_link *l, |
1926 | struct sk_buff_head *xmitq) | |
1927 | { | |
1928 | u32 onode = tipc_own_addr(l->net); | |
1929 | struct tipc_msg *hdr, *ihdr; | |
1930 | struct sk_buff_head tnlq; | |
1931 | struct sk_buff *skb; | |
1932 | u32 dnode = l->addr; | |
1933 | ||
e654f9f5 | 1934 | __skb_queue_head_init(&tnlq); |
c140eb16 LDC |
1935 | skb = tipc_msg_create(TUNNEL_PROTOCOL, FAILOVER_MSG, |
1936 | INT_H_SIZE, BASIC_H_SIZE, | |
1937 | dnode, onode, 0, 0, 0); | |
1938 | if (!skb) { | |
1939 | pr_warn("%sunable to create tunnel packet\n", link_co_err); | |
1940 | return; | |
1941 | } | |
1942 | ||
1943 | hdr = buf_msg(skb); | |
1944 | msg_set_msgcnt(hdr, 1); | |
1945 | msg_set_bearer_id(hdr, l->peer_bearer_id); | |
1946 | ||
1947 | ihdr = (struct tipc_msg *)msg_data(hdr); | |
1948 | tipc_msg_init(onode, ihdr, TIPC_LOW_IMPORTANCE, TIPC_DIRECT_MSG, | |
1949 | BASIC_H_SIZE, dnode); | |
1950 | msg_set_errcode(ihdr, TIPC_ERR_NO_PORT); | |
1951 | __skb_queue_tail(&tnlq, skb); | |
1952 | tipc_link_xmit(l, &tnlq, xmitq); | |
1953 | } | |
1954 | ||
6e498158 | 1955 | /* tipc_link_tnl_prepare(): prepare and return a list of tunnel packets |
f9aa358a | 1956 | * with contents of the link's transmit and backlog queues. |
b97bf3fd | 1957 | */ |
6e498158 JPM |
1958 | void tipc_link_tnl_prepare(struct tipc_link *l, struct tipc_link *tnl, |
1959 | int mtyp, struct sk_buff_head *xmitq) | |
b97bf3fd | 1960 | { |
58ee86b8 | 1961 | struct sk_buff_head *fdefq = &tnl->failover_deferdq; |
6e498158 JPM |
1962 | struct sk_buff *skb, *tnlskb; |
1963 | struct tipc_msg *hdr, tnlhdr; | |
1964 | struct sk_buff_head *queue = &l->transmq; | |
2320bcda | 1965 | struct sk_buff_head tmpxq, tnlq, frags; |
6e498158 | 1966 | u16 pktlen, pktcnt, seqno = l->snd_nxt; |
2320bcda | 1967 | bool pktcnt_need_update = false; |
4929a932 | 1968 | u16 syncpt; |
2320bcda | 1969 | int rc; |
b97bf3fd | 1970 | |
6e498158 | 1971 | if (!tnl) |
b97bf3fd PL |
1972 | return; |
1973 | ||
e654f9f5 | 1974 | __skb_queue_head_init(&tnlq); |
4929a932 TL |
1975 | /* Link Synching: |
1976 | * From now on, send only one single ("dummy") SYNCH message | |
1977 | * to peer. The SYNCH message does not contain any data, just | |
1978 | * a header conveying the synch point to the peer. | |
1979 | */ | |
1980 | if (mtyp == SYNCH_MSG && (tnl->peer_caps & TIPC_TUNNEL_ENHANCED)) { | |
1981 | tnlskb = tipc_msg_create(TUNNEL_PROTOCOL, SYNCH_MSG, | |
1982 | INT_H_SIZE, 0, l->addr, | |
1983 | tipc_own_addr(l->net), | |
1984 | 0, 0, 0); | |
1985 | if (!tnlskb) { | |
1986 | pr_warn("%sunable to create dummy SYNCH_MSG\n", | |
1987 | link_co_err); | |
1988 | return; | |
1989 | } | |
1990 | ||
1991 | hdr = buf_msg(tnlskb); | |
1992 | syncpt = l->snd_nxt + skb_queue_len(&l->backlogq) - 1; | |
1993 | msg_set_syncpt(hdr, syncpt); | |
1994 | msg_set_bearer_id(hdr, l->peer_bearer_id); | |
1995 | __skb_queue_tail(&tnlq, tnlskb); | |
1996 | tipc_link_xmit(tnl, &tnlq, xmitq); | |
1997 | return; | |
1998 | } | |
1999 | ||
d0d605c5 TL |
2000 | __skb_queue_head_init(&tmpxq); |
2001 | __skb_queue_head_init(&frags); | |
2002 | /* At least one packet required for safe algorithm => add dummy */ | |
2003 | skb = tipc_msg_create(TIPC_LOW_IMPORTANCE, TIPC_DIRECT_MSG, | |
2004 | BASIC_H_SIZE, 0, l->addr, tipc_own_addr(l->net), | |
2005 | 0, 0, TIPC_ERR_NO_PORT); | |
2006 | if (!skb) { | |
2007 | pr_warn("%sunable to create tunnel packet\n", link_co_err); | |
2008 | return; | |
2009 | } | |
2010 | __skb_queue_tail(&tnlq, skb); | |
2011 | tipc_link_xmit(l, &tnlq, &tmpxq); | |
2012 | __skb_queue_purge(&tmpxq); | |
2013 | ||
6e498158 | 2014 | /* Initialize reusable tunnel packet header */ |
e74a386d | 2015 | tipc_msg_init(tipc_own_addr(l->net), &tnlhdr, TUNNEL_PROTOCOL, |
6e498158 | 2016 | mtyp, INT_H_SIZE, l->addr); |
58ee86b8 TL |
2017 | if (mtyp == SYNCH_MSG) |
2018 | pktcnt = l->snd_nxt - buf_seqno(skb_peek(&l->transmq)); | |
2019 | else | |
2020 | pktcnt = skb_queue_len(&l->transmq); | |
2021 | pktcnt += skb_queue_len(&l->backlogq); | |
6e498158 JPM |
2022 | msg_set_msgcnt(&tnlhdr, pktcnt); |
2023 | msg_set_bearer_id(&tnlhdr, l->peer_bearer_id); | |
2024 | tnl: | |
2025 | /* Wrap each packet into a tunnel packet */ | |
05dcc5aa | 2026 | skb_queue_walk(queue, skb) { |
6e498158 JPM |
2027 | hdr = buf_msg(skb); |
2028 | if (queue == &l->backlogq) | |
2029 | msg_set_seqno(hdr, seqno++); | |
2030 | pktlen = msg_size(hdr); | |
2320bcda TL |
2031 | |
2032 | /* Tunnel link MTU is not large enough? This could be | |
2033 | * due to: | |
2034 | * 1) Link MTU has just changed or set differently; | |
2035 | * 2) Or FAILOVER on the top of a SYNCH message | |
2036 | * | |
2037 | * The 2nd case should not happen if peer supports | |
2038 | * TIPC_TUNNEL_ENHANCED | |
2039 | */ | |
2040 | if (pktlen > tnl->mtu - INT_H_SIZE) { | |
2041 | if (mtyp == FAILOVER_MSG && | |
2042 | (tnl->peer_caps & TIPC_TUNNEL_ENHANCED)) { | |
2043 | rc = tipc_msg_fragment(skb, &tnlhdr, tnl->mtu, | |
2044 | &frags); | |
2045 | if (rc) { | |
2046 | pr_warn("%sunable to frag msg: rc %d\n", | |
2047 | link_co_err, rc); | |
2048 | return; | |
2049 | } | |
2050 | pktcnt += skb_queue_len(&frags) - 1; | |
2051 | pktcnt_need_update = true; | |
2052 | skb_queue_splice_tail_init(&frags, &tnlq); | |
2053 | continue; | |
2054 | } | |
2055 | /* Unluckily, peer doesn't have TIPC_TUNNEL_ENHANCED | |
2056 | * => Just warn it and return! | |
2057 | */ | |
2058 | pr_warn_ratelimited("%stoo large msg <%d, %d>: %d!\n", | |
2059 | link_co_err, msg_user(hdr), | |
2060 | msg_type(hdr), msg_size(hdr)); | |
2061 | return; | |
2062 | } | |
2063 | ||
6e498158 | 2064 | msg_set_size(&tnlhdr, pktlen + INT_H_SIZE); |
57d5f64d | 2065 | tnlskb = tipc_buf_acquire(pktlen + INT_H_SIZE, GFP_ATOMIC); |
6e498158 JPM |
2066 | if (!tnlskb) { |
2067 | pr_warn("%sunable to send packet\n", link_co_err); | |
b97bf3fd PL |
2068 | return; |
2069 | } | |
6e498158 JPM |
2070 | skb_copy_to_linear_data(tnlskb, &tnlhdr, INT_H_SIZE); |
2071 | skb_copy_to_linear_data_offset(tnlskb, INT_H_SIZE, hdr, pktlen); | |
2072 | __skb_queue_tail(&tnlq, tnlskb); | |
b97bf3fd | 2073 | } |
6e498158 JPM |
2074 | if (queue != &l->backlogq) { |
2075 | queue = &l->backlogq; | |
2076 | goto tnl; | |
f006c9c7 | 2077 | } |
1dab3d5a | 2078 | |
2320bcda TL |
2079 | if (pktcnt_need_update) |
2080 | skb_queue_walk(&tnlq, skb) { | |
2081 | hdr = buf_msg(skb); | |
2082 | msg_set_msgcnt(hdr, pktcnt); | |
2083 | } | |
2084 | ||
6e498158 | 2085 | tipc_link_xmit(tnl, &tnlq, xmitq); |
b97bf3fd | 2086 | |
6e498158 JPM |
2087 | if (mtyp == FAILOVER_MSG) { |
2088 | tnl->drop_point = l->rcv_nxt; | |
2089 | tnl->failover_reasm_skb = l->reasm_buf; | |
2090 | l->reasm_buf = NULL; | |
58ee86b8 TL |
2091 | |
2092 | /* Failover the link's deferdq */ | |
2093 | if (unlikely(!skb_queue_empty(fdefq))) { | |
2094 | pr_warn("Link failover deferdq not empty: %d!\n", | |
2095 | skb_queue_len(fdefq)); | |
2096 | __skb_queue_purge(fdefq); | |
2097 | } | |
2098 | skb_queue_splice_init(&l->deferdq, fdefq); | |
2da71425 | 2099 | } |
b97bf3fd PL |
2100 | } |
2101 | ||
c0b14a08 TL |
2102 | /** |
2103 | * tipc_link_failover_prepare() - prepare tnl for link failover | |
2104 | * | |
2105 | * This is a special version of the precursor - tipc_link_tnl_prepare(), | |
2106 | * see the tipc_node_link_failover() for details | |
2107 | * | |
2108 | * @l: failover link | |
2109 | * @tnl: tunnel link | |
2110 | * @xmitq: queue for messages to be xmited | |
2111 | */ | |
2112 | void tipc_link_failover_prepare(struct tipc_link *l, struct tipc_link *tnl, | |
2113 | struct sk_buff_head *xmitq) | |
2114 | { | |
2115 | struct sk_buff_head *fdefq = &tnl->failover_deferdq; | |
2116 | ||
2117 | tipc_link_create_dummy_tnl_msg(tnl, xmitq); | |
2118 | ||
8ebed8ae | 2119 | /* This failover link endpoint was never established before, |
c0b14a08 TL |
2120 | * so it has not received anything from peer. |
2121 | * Otherwise, it must be a normal failover situation or the | |
2122 | * node has entered SELF_DOWN_PEER_LEAVING and both peer nodes | |
2123 | * would have to start over from scratch instead. | |
2124 | */ | |
c0b14a08 TL |
2125 | tnl->drop_point = 1; |
2126 | tnl->failover_reasm_skb = NULL; | |
2127 | ||
2128 | /* Initiate the link's failover deferdq */ | |
2129 | if (unlikely(!skb_queue_empty(fdefq))) { | |
2130 | pr_warn("Link failover deferdq not empty: %d!\n", | |
2131 | skb_queue_len(fdefq)); | |
2132 | __skb_queue_purge(fdefq); | |
2133 | } | |
2134 | } | |
2135 | ||
7ea817f4 JM |
2136 | /* tipc_link_validate_msg(): validate message against current link state |
2137 | * Returns true if message should be accepted, otherwise false | |
2138 | */ | |
2139 | bool tipc_link_validate_msg(struct tipc_link *l, struct tipc_msg *hdr) | |
2140 | { | |
2141 | u16 curr_session = l->peer_session; | |
2142 | u16 session = msg_session(hdr); | |
2143 | int mtyp = msg_type(hdr); | |
2144 | ||
2145 | if (msg_user(hdr) != LINK_PROTOCOL) | |
2146 | return true; | |
2147 | ||
2148 | switch (mtyp) { | |
2149 | case RESET_MSG: | |
2150 | if (!l->in_session) | |
2151 | return true; | |
2152 | /* Accept only RESET with new session number */ | |
2153 | return more(session, curr_session); | |
2154 | case ACTIVATE_MSG: | |
2155 | if (!l->in_session) | |
2156 | return true; | |
2157 | /* Accept only ACTIVATE with new or current session number */ | |
2158 | return !less(session, curr_session); | |
2159 | case STATE_MSG: | |
2160 | /* Accept only STATE with current session number */ | |
2161 | if (!l->in_session) | |
2162 | return false; | |
2163 | if (session != curr_session) | |
2164 | return false; | |
d949cfed LDC |
2165 | /* Extra sanity check */ |
2166 | if (!link_is_up(l) && msg_ack(hdr)) | |
2167 | return false; | |
7ea817f4 JM |
2168 | if (!(l->peer_caps & TIPC_LINK_PROTO_SEQNO)) |
2169 | return true; | |
2170 | /* Accept only STATE with new sequence number */ | |
2171 | return !less(msg_seqno(hdr), l->rcv_nxt_state); | |
2172 | default: | |
2173 | return false; | |
2174 | } | |
2175 | } | |
2176 | ||
d999297c JPM |
2177 | /* tipc_link_proto_rcv(): receive link level protocol message : |
2178 | * Note that network plane id propagates through the network, and may | |
2179 | * change at any time. The node with lowest numerical id determines | |
2180 | * network plane | |
2181 | */ | |
2182 | static int tipc_link_proto_rcv(struct tipc_link *l, struct sk_buff *skb, | |
2183 | struct sk_buff_head *xmitq) | |
2184 | { | |
2185 | struct tipc_msg *hdr = buf_msg(skb); | |
9195948f | 2186 | struct tipc_gap_ack_blks *ga = NULL; |
d7626b5a | 2187 | bool reply = msg_probe(hdr), retransmitted = false; |
56077b56 | 2188 | u32 dlen = msg_data_sz(hdr), glen = 0, msg_max; |
d999297c JPM |
2189 | u16 peers_snd_nxt = msg_next_sent(hdr); |
2190 | u16 peers_tol = msg_link_tolerance(hdr); | |
2191 | u16 peers_prio = msg_linkprio(hdr); | |
d7626b5a TL |
2192 | u16 gap = msg_seq_gap(hdr); |
2193 | u16 ack = msg_ack(hdr); | |
2be80c2d | 2194 | u16 rcv_nxt = l->rcv_nxt; |
d7626b5a | 2195 | u16 rcvgap = 0; |
73f646ce | 2196 | int mtyp = msg_type(hdr); |
d7626b5a | 2197 | int rc = 0, released; |
d999297c | 2198 | char *if_name; |
d7626b5a | 2199 | void *data; |
d999297c | 2200 | |
26574db0 | 2201 | trace_tipc_proto_rcv(skb, false, l->name); |
9aa422ad JM |
2202 | |
2203 | if (dlen > U16_MAX) | |
2204 | goto exit; | |
2205 | ||
52666986 | 2206 | if (tipc_link_is_blocked(l) || !xmitq) |
d999297c JPM |
2207 | goto exit; |
2208 | ||
e74a386d | 2209 | if (tipc_own_addr(l->net) > msg_prevnode(hdr)) |
d999297c JPM |
2210 | l->net_plane = msg_net_plane(hdr); |
2211 | ||
743117a9 Y |
2212 | if (skb_linearize(skb)) |
2213 | goto exit; | |
2214 | ||
35c55c98 JPM |
2215 | hdr = buf_msg(skb); |
2216 | data = msg_data(hdr); | |
2217 | ||
26574db0 TL |
2218 | if (!tipc_link_validate_msg(l, hdr)) { |
2219 | trace_tipc_skb_dump(skb, false, "PROTO invalid (1)!"); | |
2220 | trace_tipc_link_dump(l, TIPC_DUMP_NONE, "PROTO invalid (1)!"); | |
7ea817f4 | 2221 | goto exit; |
26574db0 | 2222 | } |
7ea817f4 | 2223 | |
73f646ce | 2224 | switch (mtyp) { |
d999297c | 2225 | case RESET_MSG: |
d999297c | 2226 | case ACTIVATE_MSG: |
56077b56 XL |
2227 | msg_max = msg_max_pkt(hdr); |
2228 | if (msg_max < tipc_bearer_min_mtu(l->net, l->bearer_id)) | |
2229 | break; | |
d999297c JPM |
2230 | /* Complete own link name with peer's interface name */ |
2231 | if_name = strrchr(l->name, ':') + 1; | |
2232 | if (sizeof(l->name) - (if_name - l->name) <= TIPC_MAX_IF_NAME) | |
2233 | break; | |
2234 | if (msg_data_sz(hdr) < TIPC_MAX_IF_NAME) | |
2235 | break; | |
35c55c98 | 2236 | strncpy(if_name, data, TIPC_MAX_IF_NAME); |
d999297c JPM |
2237 | |
2238 | /* Update own tolerance if peer indicates a non-zero value */ | |
f9bff0e3 | 2239 | if (tipc_in_range(peers_tol, TIPC_MIN_LINK_TOL, TIPC_MAX_LINK_TOL)) { |
d999297c | 2240 | l->tolerance = peers_tol; |
047491ea JM |
2241 | l->bc_rcvlink->tolerance = peers_tol; |
2242 | } | |
d999297c | 2243 | /* Update own priority if peer's priority is higher */ |
f9bff0e3 | 2244 | if (tipc_in_range(peers_prio, l->priority + 1, TIPC_MAX_LINK_PRI)) |
d999297c JPM |
2245 | l->priority = peers_prio; |
2246 | ||
7ab412d3 JM |
2247 | /* If peer is going down we want full re-establish cycle */ |
2248 | if (msg_peer_stopping(hdr)) { | |
634696b1 | 2249 | rc = tipc_link_fsm_evt(l, LINK_FAILURE_EVT); |
7ab412d3 JM |
2250 | break; |
2251 | } | |
91986ee1 TL |
2252 | |
2253 | /* If this endpoint was re-created while peer was ESTABLISHING | |
2254 | * it doesn't know current session number. Force re-synch. | |
2255 | */ | |
2256 | if (mtyp == ACTIVATE_MSG && msg_dest_session_valid(hdr) && | |
2257 | l->session != msg_dest_session(hdr)) { | |
2258 | if (less(l->session, msg_dest_session(hdr))) | |
2259 | l->session = msg_dest_session(hdr) + 1; | |
2260 | break; | |
2261 | } | |
2262 | ||
7ab412d3 JM |
2263 | /* ACTIVATE_MSG serves as PEER_RESET if link is already down */ |
2264 | if (mtyp == RESET_MSG || !link_is_up(l)) | |
73f646ce JPM |
2265 | rc = tipc_link_fsm_evt(l, LINK_PEER_RESET_EVT); |
2266 | ||
2267 | /* ACTIVATE_MSG takes up link if it was already locally reset */ | |
7ab412d3 | 2268 | if (mtyp == ACTIVATE_MSG && l->state == LINK_ESTABLISHING) |
73f646ce JPM |
2269 | rc = TIPC_LINK_UP_EVT; |
2270 | ||
d999297c | 2271 | l->peer_session = msg_session(hdr); |
7ea817f4 | 2272 | l->in_session = true; |
d999297c | 2273 | l->peer_bearer_id = msg_bearer_id(hdr); |
56077b56 XL |
2274 | if (l->mtu > msg_max) |
2275 | l->mtu = msg_max; | |
d999297c | 2276 | break; |
662921cd | 2277 | |
d999297c | 2278 | case STATE_MSG: |
c79fcc27 TN |
2279 | /* Validate Gap ACK blocks, drop if invalid */ |
2280 | glen = tipc_get_gap_ack_blks(&ga, l, hdr, true); | |
2281 | if (glen > dlen) | |
2282 | break; | |
2283 | ||
9012de50 JM |
2284 | l->rcv_nxt_state = msg_seqno(hdr) + 1; |
2285 | ||
d999297c | 2286 | /* Update own tolerance if peer indicates a non-zero value */ |
f9bff0e3 | 2287 | if (tipc_in_range(peers_tol, TIPC_MIN_LINK_TOL, TIPC_MAX_LINK_TOL)) { |
d999297c | 2288 | l->tolerance = peers_tol; |
047491ea JM |
2289 | l->bc_rcvlink->tolerance = peers_tol; |
2290 | } | |
f7967556 JPM |
2291 | /* Update own prio if peer indicates a different value */ |
2292 | if ((peers_prio != l->priority) && | |
f9bff0e3 | 2293 | tipc_in_range(peers_prio, 1, TIPC_MAX_LINK_PRI)) { |
81729810 RA |
2294 | l->priority = peers_prio; |
2295 | rc = tipc_link_fsm_evt(l, LINK_FAILURE_EVT); | |
2296 | } | |
2297 | ||
d999297c JPM |
2298 | l->silent_intv_cnt = 0; |
2299 | l->stats.recv_states++; | |
2300 | if (msg_probe(hdr)) | |
2301 | l->stats.recv_probes++; | |
73f646ce JPM |
2302 | |
2303 | if (!link_is_up(l)) { | |
2304 | if (l->state == LINK_ESTABLISHING) | |
2305 | rc = TIPC_LINK_UP_EVT; | |
d999297c | 2306 | break; |
73f646ce | 2307 | } |
9195948f | 2308 | |
9195948f | 2309 | tipc_mon_rcv(l->net, data + glen, dlen - glen, l->addr, |
35c55c98 | 2310 | &l->mon_state, l->bearer_id); |
d999297c | 2311 | |
662921cd | 2312 | /* Send NACK if peer has sent pkts we haven't received yet */ |
d3b09995 JM |
2313 | if ((reply || msg_is_keepalive(hdr)) && |
2314 | more(peers_snd_nxt, rcv_nxt) && | |
2315 | !tipc_link_is_synching(l) && | |
2316 | skb_queue_empty(&l->deferdq)) | |
d999297c | 2317 | rcvgap = peers_snd_nxt - l->rcv_nxt; |
8d6e79d3 JM |
2318 | if (rcvgap || reply) |
2319 | tipc_link_build_proto_msg(l, STATE_MSG, 0, reply, | |
2320 | rcvgap, 0, 0, xmitq); | |
d999297c | 2321 | |
d7626b5a TL |
2322 | released = tipc_link_advance_transmq(l, l, ack, gap, ga, xmitq, |
2323 | &retransmitted, &rc); | |
9195948f | 2324 | if (gap) |
d999297c | 2325 | l->stats.recv_nacks++; |
d7626b5a TL |
2326 | if (released || retransmitted) |
2327 | tipc_link_update_cwin(l, released, retransmitted); | |
2328 | if (released) | |
2329 | tipc_link_advance_backlog(l, xmitq); | |
d999297c JPM |
2330 | if (unlikely(!skb_queue_empty(&l->wakeupq))) |
2331 | link_prepare_wakeup(l); | |
2332 | } | |
2333 | exit: | |
2334 | kfree_skb(skb); | |
2335 | return rc; | |
2336 | } | |
2337 | ||
52666986 JPM |
2338 | /* tipc_link_build_bc_proto_msg() - create broadcast protocol message |
2339 | */ | |
2340 | static bool tipc_link_build_bc_proto_msg(struct tipc_link *l, bool bcast, | |
2341 | u16 peers_snd_nxt, | |
2342 | struct sk_buff_head *xmitq) | |
2343 | { | |
2344 | struct sk_buff *skb; | |
2345 | struct tipc_msg *hdr; | |
2346 | struct sk_buff *dfrd_skb = skb_peek(&l->deferdq); | |
2347 | u16 ack = l->rcv_nxt - 1; | |
2348 | u16 gap_to = peers_snd_nxt - 1; | |
2349 | ||
2350 | skb = tipc_msg_create(BCAST_PROTOCOL, STATE_MSG, INT_H_SIZE, | |
e74a386d | 2351 | 0, l->addr, tipc_own_addr(l->net), 0, 0, 0); |
52666986 JPM |
2352 | if (!skb) |
2353 | return false; | |
2354 | hdr = buf_msg(skb); | |
2355 | msg_set_last_bcast(hdr, l->bc_sndlink->snd_nxt - 1); | |
2356 | msg_set_bcast_ack(hdr, ack); | |
2357 | msg_set_bcgap_after(hdr, ack); | |
2358 | if (dfrd_skb) | |
2359 | gap_to = buf_seqno(dfrd_skb) - 1; | |
2360 | msg_set_bcgap_to(hdr, gap_to); | |
2361 | msg_set_non_seq(hdr, bcast); | |
2362 | __skb_queue_tail(xmitq, skb); | |
2363 | return true; | |
2364 | } | |
2365 | ||
2366 | /* tipc_link_build_bc_init_msg() - synchronize broadcast link endpoints. | |
2367 | * | |
2368 | * Give a newly added peer node the sequence number where it should | |
2369 | * start receiving and acking broadcast packets. | |
2370 | */ | |
742e0383 WF |
2371 | static void tipc_link_build_bc_init_msg(struct tipc_link *l, |
2372 | struct sk_buff_head *xmitq) | |
52666986 JPM |
2373 | { |
2374 | struct sk_buff_head list; | |
2375 | ||
2376 | __skb_queue_head_init(&list); | |
2377 | if (!tipc_link_build_bc_proto_msg(l->bc_rcvlink, false, 0, &list)) | |
2378 | return; | |
06bd2b1e | 2379 | msg_set_bc_ack_invalid(buf_msg(skb_peek(&list)), true); |
52666986 JPM |
2380 | tipc_link_xmit(l, &list, xmitq); |
2381 | } | |
2382 | ||
2383 | /* tipc_link_bc_init_rcv - receive initial broadcast synch data from peer | |
2384 | */ | |
2385 | void tipc_link_bc_init_rcv(struct tipc_link *l, struct tipc_msg *hdr) | |
2386 | { | |
2387 | int mtyp = msg_type(hdr); | |
2388 | u16 peers_snd_nxt = msg_bc_snd_nxt(hdr); | |
2389 | ||
2390 | if (link_is_up(l)) | |
2391 | return; | |
2392 | ||
2393 | if (msg_user(hdr) == BCAST_PROTOCOL) { | |
2394 | l->rcv_nxt = peers_snd_nxt; | |
2395 | l->state = LINK_ESTABLISHED; | |
2396 | return; | |
2397 | } | |
2398 | ||
2399 | if (l->peer_caps & TIPC_BCAST_SYNCH) | |
2400 | return; | |
2401 | ||
2402 | if (msg_peer_node_is_up(hdr)) | |
2403 | return; | |
2404 | ||
2405 | /* Compatibility: accept older, less safe initial synch data */ | |
2406 | if ((mtyp == RESET_MSG) || (mtyp == ACTIVATE_MSG)) | |
2407 | l->rcv_nxt = peers_snd_nxt; | |
2408 | } | |
2409 | ||
2410 | /* tipc_link_bc_sync_rcv - update rcv link according to peer's send state | |
2411 | */ | |
02d11ca2 JPM |
2412 | int tipc_link_bc_sync_rcv(struct tipc_link *l, struct tipc_msg *hdr, |
2413 | struct sk_buff_head *xmitq) | |
52666986 JPM |
2414 | { |
2415 | u16 peers_snd_nxt = msg_bc_snd_nxt(hdr); | |
02d11ca2 | 2416 | int rc = 0; |
52666986 JPM |
2417 | |
2418 | if (!link_is_up(l)) | |
02d11ca2 | 2419 | return rc; |
52666986 JPM |
2420 | |
2421 | if (!msg_peer_node_is_up(hdr)) | |
02d11ca2 | 2422 | return rc; |
52666986 | 2423 | |
a99df449 | 2424 | /* Open when peer acknowledges our bcast init msg (pkt #1) */ |
2d18ac4b JPM |
2425 | if (msg_ack(hdr)) |
2426 | l->bc_peer_is_up = true; | |
2427 | ||
2428 | if (!l->bc_peer_is_up) | |
02d11ca2 | 2429 | return rc; |
52666986 JPM |
2430 | |
2431 | /* Ignore if peers_snd_nxt goes beyond receive window */ | |
2432 | if (more(peers_snd_nxt, l->rcv_nxt + l->window)) | |
02d11ca2 JPM |
2433 | return rc; |
2434 | ||
02d11ca2 JPM |
2435 | l->snd_nxt = peers_snd_nxt; |
2436 | if (link_bc_rcv_gap(l)) | |
2437 | rc |= TIPC_LINK_SND_STATE; | |
2438 | ||
2439 | /* Return now if sender supports nack via STATE messages */ | |
2440 | if (l->peer_caps & TIPC_BCAST_STATE_NACK) | |
2441 | return rc; | |
2442 | ||
2443 | /* Otherwise, be backwards compatible */ | |
52666986 JPM |
2444 | |
2445 | if (!more(peers_snd_nxt, l->rcv_nxt)) { | |
2446 | l->nack_state = BC_NACK_SND_CONDITIONAL; | |
02d11ca2 | 2447 | return 0; |
52666986 JPM |
2448 | } |
2449 | ||
2450 | /* Don't NACK if one was recently sent or peeked */ | |
2451 | if (l->nack_state == BC_NACK_SND_SUPPRESS) { | |
2452 | l->nack_state = BC_NACK_SND_UNCONDITIONAL; | |
02d11ca2 | 2453 | return 0; |
52666986 JPM |
2454 | } |
2455 | ||
2456 | /* Conditionally delay NACK sending until next synch rcv */ | |
2457 | if (l->nack_state == BC_NACK_SND_CONDITIONAL) { | |
2458 | l->nack_state = BC_NACK_SND_UNCONDITIONAL; | |
2459 | if ((peers_snd_nxt - l->rcv_nxt) < TIPC_MIN_LINK_WIN) | |
02d11ca2 | 2460 | return 0; |
52666986 JPM |
2461 | } |
2462 | ||
2463 | /* Send NACK now but suppress next one */ | |
2464 | tipc_link_build_bc_proto_msg(l, true, peers_snd_nxt, xmitq); | |
2465 | l->nack_state = BC_NACK_SND_SUPPRESS; | |
02d11ca2 | 2466 | return 0; |
52666986 JPM |
2467 | } |
2468 | ||
d7626b5a TL |
2469 | int tipc_link_bc_ack_rcv(struct tipc_link *r, u16 acked, u16 gap, |
2470 | struct tipc_gap_ack_blks *ga, | |
a91d55d1 TL |
2471 | struct sk_buff_head *xmitq, |
2472 | struct sk_buff_head *retrq) | |
52666986 | 2473 | { |
d7626b5a TL |
2474 | struct tipc_link *l = r->bc_sndlink; |
2475 | bool unused = false; | |
2476 | int rc = 0; | |
52666986 | 2477 | |
d7626b5a TL |
2478 | if (!link_is_up(r) || !r->bc_peer_is_up) |
2479 | return 0; | |
52666986 | 2480 | |
03b6fefd TL |
2481 | if (gap) { |
2482 | l->stats.recv_nacks++; | |
2483 | r->stats.recv_nacks++; | |
2484 | } | |
2485 | ||
d7626b5a TL |
2486 | if (less(acked, r->acked) || (acked == r->acked && !gap && !ga)) |
2487 | return 0; | |
52666986 | 2488 | |
c6ed7a5c | 2489 | trace_tipc_link_bc_ack(r, acked, gap, &l->transmq); |
a91d55d1 | 2490 | tipc_link_advance_transmq(l, r, acked, gap, ga, retrq, &unused, &rc); |
52666986 | 2491 | |
d7626b5a TL |
2492 | tipc_link_advance_backlog(l, xmitq); |
2493 | if (unlikely(!skb_queue_empty(&l->wakeupq))) | |
2494 | link_prepare_wakeup(l); | |
2495 | ||
2496 | return rc; | |
52666986 JPM |
2497 | } |
2498 | ||
2499 | /* tipc_link_bc_nack_rcv(): receive broadcast nack message | |
02d11ca2 JPM |
2500 | * This function is here for backwards compatibility, since |
2501 | * no BCAST_PROTOCOL/STATE messages occur from TIPC v2.5. | |
52666986 JPM |
2502 | */ |
2503 | int tipc_link_bc_nack_rcv(struct tipc_link *l, struct sk_buff *skb, | |
2504 | struct sk_buff_head *xmitq) | |
2505 | { | |
2506 | struct tipc_msg *hdr = buf_msg(skb); | |
2507 | u32 dnode = msg_destnode(hdr); | |
2508 | int mtyp = msg_type(hdr); | |
2509 | u16 acked = msg_bcast_ack(hdr); | |
2510 | u16 from = acked + 1; | |
2511 | u16 to = msg_bcgap_to(hdr); | |
2512 | u16 peers_snd_nxt = to + 1; | |
2513 | int rc = 0; | |
2514 | ||
2515 | kfree_skb(skb); | |
2516 | ||
2517 | if (!tipc_link_is_up(l) || !l->bc_peer_is_up) | |
2518 | return 0; | |
2519 | ||
2520 | if (mtyp != STATE_MSG) | |
2521 | return 0; | |
2522 | ||
e74a386d | 2523 | if (dnode == tipc_own_addr(l->net)) { |
a91d55d1 TL |
2524 | rc = tipc_link_bc_ack_rcv(l, acked, to - acked, NULL, xmitq, |
2525 | xmitq); | |
52666986 JPM |
2526 | l->stats.recv_nacks++; |
2527 | return rc; | |
2528 | } | |
2529 | ||
2530 | /* Msg for other node => suppress own NACK at next sync if applicable */ | |
2531 | if (more(peers_snd_nxt, l->rcv_nxt) && !less(l->rcv_nxt, from)) | |
2532 | l->nack_state = BC_NACK_SND_SUPPRESS; | |
2533 | ||
2534 | return 0; | |
2535 | } | |
2536 | ||
16ad3f40 | 2537 | void tipc_link_set_queue_limits(struct tipc_link *l, u32 min_win, u32 max_win) |
b97bf3fd | 2538 | { |
218527fe | 2539 | int max_bulk = TIPC_MAX_PUBL / (l->mtu / ITEM_SIZE); |
e3eea1eb | 2540 | |
16ad3f40 JM |
2541 | l->min_win = min_win; |
2542 | l->ssthresh = max_win; | |
2543 | l->max_win = max_win; | |
2544 | l->window = min_win; | |
2545 | l->backlog[TIPC_LOW_IMPORTANCE].limit = min_win * 2; | |
2546 | l->backlog[TIPC_MEDIUM_IMPORTANCE].limit = min_win * 4; | |
2547 | l->backlog[TIPC_HIGH_IMPORTANCE].limit = min_win * 6; | |
2548 | l->backlog[TIPC_CRITICAL_IMPORTANCE].limit = min_win * 8; | |
1f66d161 | 2549 | l->backlog[TIPC_SYSTEM_IMPORTANCE].limit = max_bulk; |
b97bf3fd PL |
2550 | } |
2551 | ||
b97bf3fd | 2552 | /** |
25764779 | 2553 | * tipc_link_reset_stats - reset link statistics |
1a90632d | 2554 | * @l: pointer to link |
b97bf3fd | 2555 | */ |
38206d59 | 2556 | void tipc_link_reset_stats(struct tipc_link *l) |
b97bf3fd | 2557 | { |
38206d59 | 2558 | memset(&l->stats, 0, sizeof(l->stats)); |
b97bf3fd PL |
2559 | } |
2560 | ||
1a20cc25 | 2561 | static void link_print(struct tipc_link *l, const char *str) |
b97bf3fd | 2562 | { |
1a20cc25 | 2563 | struct sk_buff *hskb = skb_peek(&l->transmq); |
c1ab3f1d | 2564 | u16 head = hskb ? msg_seqno(buf_msg(hskb)) : l->snd_nxt - 1; |
1a20cc25 | 2565 | u16 tail = l->snd_nxt - 1; |
7a2f7d18 | 2566 | |
662921cd | 2567 | pr_info("%s Link <%s> state %x\n", str, l->name, l->state); |
1a20cc25 JPM |
2568 | pr_info("XMTQ: %u [%u-%u], BKLGQ: %u, SNDNX: %u, RCVNX: %u\n", |
2569 | skb_queue_len(&l->transmq), head, tail, | |
2570 | skb_queue_len(&l->backlogq), l->snd_nxt, l->rcv_nxt); | |
b97bf3fd | 2571 | } |
0655f6a8 RA |
2572 | |
2573 | /* Parse and validate nested (link) properties valid for media, bearer and link | |
2574 | */ | |
2575 | int tipc_nl_parse_link_prop(struct nlattr *prop, struct nlattr *props[]) | |
2576 | { | |
2577 | int err; | |
2578 | ||
8cb08174 JB |
2579 | err = nla_parse_nested_deprecated(props, TIPC_NLA_PROP_MAX, prop, |
2580 | tipc_nl_prop_policy, NULL); | |
0655f6a8 RA |
2581 | if (err) |
2582 | return err; | |
2583 | ||
2584 | if (props[TIPC_NLA_PROP_PRIO]) { | |
2585 | u32 prio; | |
2586 | ||
2587 | prio = nla_get_u32(props[TIPC_NLA_PROP_PRIO]); | |
2588 | if (prio > TIPC_MAX_LINK_PRI) | |
2589 | return -EINVAL; | |
2590 | } | |
2591 | ||
2592 | if (props[TIPC_NLA_PROP_TOL]) { | |
2593 | u32 tol; | |
2594 | ||
2595 | tol = nla_get_u32(props[TIPC_NLA_PROP_TOL]); | |
2596 | if ((tol < TIPC_MIN_LINK_TOL) || (tol > TIPC_MAX_LINK_TOL)) | |
2597 | return -EINVAL; | |
2598 | } | |
2599 | ||
2600 | if (props[TIPC_NLA_PROP_WIN]) { | |
16ad3f40 | 2601 | u32 max_win; |
0655f6a8 | 2602 | |
16ad3f40 JM |
2603 | max_win = nla_get_u32(props[TIPC_NLA_PROP_WIN]); |
2604 | if (max_win < TIPC_DEF_LINK_WIN || max_win > TIPC_MAX_LINK_WIN) | |
0655f6a8 RA |
2605 | return -EINVAL; |
2606 | } | |
2607 | ||
2608 | return 0; | |
2609 | } | |
7be57fc6 | 2610 | |
d8182804 | 2611 | static int __tipc_nl_add_stats(struct sk_buff *skb, struct tipc_stats *s) |
7be57fc6 RA |
2612 | { |
2613 | int i; | |
2614 | struct nlattr *stats; | |
2615 | ||
2616 | struct nla_map { | |
2617 | u32 key; | |
2618 | u32 val; | |
2619 | }; | |
2620 | ||
2621 | struct nla_map map[] = { | |
95901122 | 2622 | {TIPC_NLA_STATS_RX_INFO, 0}, |
7be57fc6 RA |
2623 | {TIPC_NLA_STATS_RX_FRAGMENTS, s->recv_fragments}, |
2624 | {TIPC_NLA_STATS_RX_FRAGMENTED, s->recv_fragmented}, | |
2625 | {TIPC_NLA_STATS_RX_BUNDLES, s->recv_bundles}, | |
2626 | {TIPC_NLA_STATS_RX_BUNDLED, s->recv_bundled}, | |
95901122 | 2627 | {TIPC_NLA_STATS_TX_INFO, 0}, |
7be57fc6 RA |
2628 | {TIPC_NLA_STATS_TX_FRAGMENTS, s->sent_fragments}, |
2629 | {TIPC_NLA_STATS_TX_FRAGMENTED, s->sent_fragmented}, | |
2630 | {TIPC_NLA_STATS_TX_BUNDLES, s->sent_bundles}, | |
2631 | {TIPC_NLA_STATS_TX_BUNDLED, s->sent_bundled}, | |
2632 | {TIPC_NLA_STATS_MSG_PROF_TOT, (s->msg_length_counts) ? | |
2633 | s->msg_length_counts : 1}, | |
2634 | {TIPC_NLA_STATS_MSG_LEN_CNT, s->msg_length_counts}, | |
2635 | {TIPC_NLA_STATS_MSG_LEN_TOT, s->msg_lengths_total}, | |
2636 | {TIPC_NLA_STATS_MSG_LEN_P0, s->msg_length_profile[0]}, | |
2637 | {TIPC_NLA_STATS_MSG_LEN_P1, s->msg_length_profile[1]}, | |
2638 | {TIPC_NLA_STATS_MSG_LEN_P2, s->msg_length_profile[2]}, | |
2639 | {TIPC_NLA_STATS_MSG_LEN_P3, s->msg_length_profile[3]}, | |
2640 | {TIPC_NLA_STATS_MSG_LEN_P4, s->msg_length_profile[4]}, | |
2641 | {TIPC_NLA_STATS_MSG_LEN_P5, s->msg_length_profile[5]}, | |
2642 | {TIPC_NLA_STATS_MSG_LEN_P6, s->msg_length_profile[6]}, | |
2643 | {TIPC_NLA_STATS_RX_STATES, s->recv_states}, | |
2644 | {TIPC_NLA_STATS_RX_PROBES, s->recv_probes}, | |
2645 | {TIPC_NLA_STATS_RX_NACKS, s->recv_nacks}, | |
2646 | {TIPC_NLA_STATS_RX_DEFERRED, s->deferred_recv}, | |
2647 | {TIPC_NLA_STATS_TX_STATES, s->sent_states}, | |
2648 | {TIPC_NLA_STATS_TX_PROBES, s->sent_probes}, | |
2649 | {TIPC_NLA_STATS_TX_NACKS, s->sent_nacks}, | |
2650 | {TIPC_NLA_STATS_TX_ACKS, s->sent_acks}, | |
2651 | {TIPC_NLA_STATS_RETRANSMITTED, s->retransmitted}, | |
2652 | {TIPC_NLA_STATS_DUPLICATES, s->duplicates}, | |
2653 | {TIPC_NLA_STATS_LINK_CONGS, s->link_congs}, | |
2654 | {TIPC_NLA_STATS_MAX_QUEUE, s->max_queue_sz}, | |
2655 | {TIPC_NLA_STATS_AVG_QUEUE, s->queue_sz_counts ? | |
2656 | (s->accu_queue_sz / s->queue_sz_counts) : 0} | |
2657 | }; | |
2658 | ||
ae0be8de | 2659 | stats = nla_nest_start_noflag(skb, TIPC_NLA_LINK_STATS); |
7be57fc6 RA |
2660 | if (!stats) |
2661 | return -EMSGSIZE; | |
2662 | ||
2663 | for (i = 0; i < ARRAY_SIZE(map); i++) | |
2664 | if (nla_put_u32(skb, map[i].key, map[i].val)) | |
2665 | goto msg_full; | |
2666 | ||
2667 | nla_nest_end(skb, stats); | |
2668 | ||
2669 | return 0; | |
2670 | msg_full: | |
2671 | nla_nest_cancel(skb, stats); | |
2672 | ||
2673 | return -EMSGSIZE; | |
2674 | } | |
2675 | ||
2676 | /* Caller should hold appropriate locks to protect the link */ | |
5be9c086 JPM |
2677 | int __tipc_nl_add_link(struct net *net, struct tipc_nl_msg *msg, |
2678 | struct tipc_link *link, int nlflags) | |
7be57fc6 | 2679 | { |
23fd3eac | 2680 | u32 self = tipc_own_addr(net); |
7be57fc6 RA |
2681 | struct nlattr *attrs; |
2682 | struct nlattr *prop; | |
23fd3eac JM |
2683 | void *hdr; |
2684 | int err; | |
7be57fc6 | 2685 | |
bfb3e5dd | 2686 | hdr = genlmsg_put(msg->skb, msg->portid, msg->seq, &tipc_genl_family, |
f2f67390 | 2687 | nlflags, TIPC_NL_LINK_GET); |
7be57fc6 RA |
2688 | if (!hdr) |
2689 | return -EMSGSIZE; | |
2690 | ||
ae0be8de | 2691 | attrs = nla_nest_start_noflag(msg->skb, TIPC_NLA_LINK); |
7be57fc6 RA |
2692 | if (!attrs) |
2693 | goto msg_full; | |
2694 | ||
2695 | if (nla_put_string(msg->skb, TIPC_NLA_LINK_NAME, link->name)) | |
2696 | goto attr_msg_full; | |
23fd3eac | 2697 | if (nla_put_u32(msg->skb, TIPC_NLA_LINK_DEST, tipc_cluster_mask(self))) |
7be57fc6 | 2698 | goto attr_msg_full; |
ed193ece | 2699 | if (nla_put_u32(msg->skb, TIPC_NLA_LINK_MTU, link->mtu)) |
7be57fc6 | 2700 | goto attr_msg_full; |
95901122 | 2701 | if (nla_put_u32(msg->skb, TIPC_NLA_LINK_RX, link->stats.recv_pkts)) |
7be57fc6 | 2702 | goto attr_msg_full; |
95901122 | 2703 | if (nla_put_u32(msg->skb, TIPC_NLA_LINK_TX, link->stats.sent_pkts)) |
7be57fc6 RA |
2704 | goto attr_msg_full; |
2705 | ||
2706 | if (tipc_link_is_up(link)) | |
2707 | if (nla_put_flag(msg->skb, TIPC_NLA_LINK_UP)) | |
2708 | goto attr_msg_full; | |
c72fa872 | 2709 | if (link->active) |
7be57fc6 RA |
2710 | if (nla_put_flag(msg->skb, TIPC_NLA_LINK_ACTIVE)) |
2711 | goto attr_msg_full; | |
2712 | ||
ae0be8de | 2713 | prop = nla_nest_start_noflag(msg->skb, TIPC_NLA_LINK_PROP); |
7be57fc6 RA |
2714 | if (!prop) |
2715 | goto attr_msg_full; | |
2716 | if (nla_put_u32(msg->skb, TIPC_NLA_PROP_PRIO, link->priority)) | |
2717 | goto prop_msg_full; | |
2718 | if (nla_put_u32(msg->skb, TIPC_NLA_PROP_TOL, link->tolerance)) | |
2719 | goto prop_msg_full; | |
2720 | if (nla_put_u32(msg->skb, TIPC_NLA_PROP_WIN, | |
1f66d161 | 2721 | link->window)) |
7be57fc6 RA |
2722 | goto prop_msg_full; |
2723 | if (nla_put_u32(msg->skb, TIPC_NLA_PROP_PRIO, link->priority)) | |
2724 | goto prop_msg_full; | |
2725 | nla_nest_end(msg->skb, prop); | |
2726 | ||
2727 | err = __tipc_nl_add_stats(msg->skb, &link->stats); | |
2728 | if (err) | |
2729 | goto attr_msg_full; | |
2730 | ||
2731 | nla_nest_end(msg->skb, attrs); | |
2732 | genlmsg_end(msg->skb, hdr); | |
2733 | ||
2734 | return 0; | |
2735 | ||
2736 | prop_msg_full: | |
2737 | nla_nest_cancel(msg->skb, prop); | |
2738 | attr_msg_full: | |
2739 | nla_nest_cancel(msg->skb, attrs); | |
2740 | msg_full: | |
2741 | genlmsg_cancel(msg->skb, hdr); | |
2742 | ||
2743 | return -EMSGSIZE; | |
2744 | } | |
38206d59 JPM |
2745 | |
2746 | static int __tipc_nl_add_bc_link_stat(struct sk_buff *skb, | |
2747 | struct tipc_stats *stats) | |
2748 | { | |
2749 | int i; | |
2750 | struct nlattr *nest; | |
2751 | ||
2752 | struct nla_map { | |
2753 | __u32 key; | |
2754 | __u32 val; | |
2755 | }; | |
2756 | ||
2757 | struct nla_map map[] = { | |
95901122 | 2758 | {TIPC_NLA_STATS_RX_INFO, stats->recv_pkts}, |
38206d59 JPM |
2759 | {TIPC_NLA_STATS_RX_FRAGMENTS, stats->recv_fragments}, |
2760 | {TIPC_NLA_STATS_RX_FRAGMENTED, stats->recv_fragmented}, | |
2761 | {TIPC_NLA_STATS_RX_BUNDLES, stats->recv_bundles}, | |
2762 | {TIPC_NLA_STATS_RX_BUNDLED, stats->recv_bundled}, | |
95901122 | 2763 | {TIPC_NLA_STATS_TX_INFO, stats->sent_pkts}, |
38206d59 JPM |
2764 | {TIPC_NLA_STATS_TX_FRAGMENTS, stats->sent_fragments}, |
2765 | {TIPC_NLA_STATS_TX_FRAGMENTED, stats->sent_fragmented}, | |
2766 | {TIPC_NLA_STATS_TX_BUNDLES, stats->sent_bundles}, | |
2767 | {TIPC_NLA_STATS_TX_BUNDLED, stats->sent_bundled}, | |
2768 | {TIPC_NLA_STATS_RX_NACKS, stats->recv_nacks}, | |
2769 | {TIPC_NLA_STATS_RX_DEFERRED, stats->deferred_recv}, | |
2770 | {TIPC_NLA_STATS_TX_NACKS, stats->sent_nacks}, | |
2771 | {TIPC_NLA_STATS_TX_ACKS, stats->sent_acks}, | |
2772 | {TIPC_NLA_STATS_RETRANSMITTED, stats->retransmitted}, | |
2773 | {TIPC_NLA_STATS_DUPLICATES, stats->duplicates}, | |
2774 | {TIPC_NLA_STATS_LINK_CONGS, stats->link_congs}, | |
2775 | {TIPC_NLA_STATS_MAX_QUEUE, stats->max_queue_sz}, | |
2776 | {TIPC_NLA_STATS_AVG_QUEUE, stats->queue_sz_counts ? | |
2777 | (stats->accu_queue_sz / stats->queue_sz_counts) : 0} | |
2778 | }; | |
2779 | ||
ae0be8de | 2780 | nest = nla_nest_start_noflag(skb, TIPC_NLA_LINK_STATS); |
38206d59 JPM |
2781 | if (!nest) |
2782 | return -EMSGSIZE; | |
2783 | ||
2784 | for (i = 0; i < ARRAY_SIZE(map); i++) | |
2785 | if (nla_put_u32(skb, map[i].key, map[i].val)) | |
2786 | goto msg_full; | |
2787 | ||
2788 | nla_nest_end(skb, nest); | |
2789 | ||
2790 | return 0; | |
2791 | msg_full: | |
2792 | nla_nest_cancel(skb, nest); | |
2793 | ||
2794 | return -EMSGSIZE; | |
2795 | } | |
2796 | ||
03b6fefd TL |
2797 | int tipc_nl_add_bc_link(struct net *net, struct tipc_nl_msg *msg, |
2798 | struct tipc_link *bcl) | |
38206d59 JPM |
2799 | { |
2800 | int err; | |
2801 | void *hdr; | |
2802 | struct nlattr *attrs; | |
2803 | struct nlattr *prop; | |
cad2929d | 2804 | u32 bc_mode = tipc_bcast_get_mode(net); |
02ec6caf | 2805 | u32 bc_ratio = tipc_bcast_get_broadcast_ratio(net); |
38206d59 JPM |
2806 | |
2807 | if (!bcl) | |
2808 | return 0; | |
2809 | ||
2810 | tipc_bcast_lock(net); | |
2811 | ||
2812 | hdr = genlmsg_put(msg->skb, msg->portid, msg->seq, &tipc_genl_family, | |
2813 | NLM_F_MULTI, TIPC_NL_LINK_GET); | |
b53ce3e7 IY |
2814 | if (!hdr) { |
2815 | tipc_bcast_unlock(net); | |
38206d59 | 2816 | return -EMSGSIZE; |
b53ce3e7 | 2817 | } |
38206d59 | 2818 | |
ae0be8de | 2819 | attrs = nla_nest_start_noflag(msg->skb, TIPC_NLA_LINK); |
38206d59 JPM |
2820 | if (!attrs) |
2821 | goto msg_full; | |
2822 | ||
2823 | /* The broadcast link is always up */ | |
2824 | if (nla_put_flag(msg->skb, TIPC_NLA_LINK_UP)) | |
2825 | goto attr_msg_full; | |
2826 | ||
2827 | if (nla_put_flag(msg->skb, TIPC_NLA_LINK_BROADCAST)) | |
2828 | goto attr_msg_full; | |
2829 | if (nla_put_string(msg->skb, TIPC_NLA_LINK_NAME, bcl->name)) | |
2830 | goto attr_msg_full; | |
95901122 | 2831 | if (nla_put_u32(msg->skb, TIPC_NLA_LINK_RX, 0)) |
38206d59 | 2832 | goto attr_msg_full; |
95901122 | 2833 | if (nla_put_u32(msg->skb, TIPC_NLA_LINK_TX, 0)) |
38206d59 JPM |
2834 | goto attr_msg_full; |
2835 | ||
ae0be8de | 2836 | prop = nla_nest_start_noflag(msg->skb, TIPC_NLA_LINK_PROP); |
38206d59 JPM |
2837 | if (!prop) |
2838 | goto attr_msg_full; | |
16ad3f40 | 2839 | if (nla_put_u32(msg->skb, TIPC_NLA_PROP_WIN, bcl->max_win)) |
38206d59 | 2840 | goto prop_msg_full; |
02ec6caf HL |
2841 | if (nla_put_u32(msg->skb, TIPC_NLA_PROP_BROADCAST, bc_mode)) |
2842 | goto prop_msg_full; | |
2843 | if (bc_mode & BCLINK_MODE_SEL) | |
2844 | if (nla_put_u32(msg->skb, TIPC_NLA_PROP_BROADCAST_RATIO, | |
2845 | bc_ratio)) | |
2846 | goto prop_msg_full; | |
38206d59 JPM |
2847 | nla_nest_end(msg->skb, prop); |
2848 | ||
2849 | err = __tipc_nl_add_bc_link_stat(msg->skb, &bcl->stats); | |
2850 | if (err) | |
2851 | goto attr_msg_full; | |
2852 | ||
2853 | tipc_bcast_unlock(net); | |
2854 | nla_nest_end(msg->skb, attrs); | |
2855 | genlmsg_end(msg->skb, hdr); | |
2856 | ||
2857 | return 0; | |
2858 | ||
2859 | prop_msg_full: | |
2860 | nla_nest_cancel(msg->skb, prop); | |
2861 | attr_msg_full: | |
2862 | nla_nest_cancel(msg->skb, attrs); | |
2863 | msg_full: | |
2864 | tipc_bcast_unlock(net); | |
2865 | genlmsg_cancel(msg->skb, hdr); | |
2866 | ||
2867 | return -EMSGSIZE; | |
2868 | } | |
2869 | ||
d01332f1 RA |
2870 | void tipc_link_set_tolerance(struct tipc_link *l, u32 tol, |
2871 | struct sk_buff_head *xmitq) | |
38206d59 JPM |
2872 | { |
2873 | l->tolerance = tol; | |
047491ea JM |
2874 | if (l->bc_rcvlink) |
2875 | l->bc_rcvlink->tolerance = tol; | |
37c64cf6 JM |
2876 | if (link_is_up(l)) |
2877 | tipc_link_build_proto_msg(l, STATE_MSG, 0, 0, 0, tol, 0, xmitq); | |
38206d59 JPM |
2878 | } |
2879 | ||
d01332f1 RA |
2880 | void tipc_link_set_prio(struct tipc_link *l, u32 prio, |
2881 | struct sk_buff_head *xmitq) | |
38206d59 JPM |
2882 | { |
2883 | l->priority = prio; | |
8d6e79d3 | 2884 | tipc_link_build_proto_msg(l, STATE_MSG, 0, 0, 0, 0, prio, xmitq); |
38206d59 JPM |
2885 | } |
2886 | ||
2887 | void tipc_link_set_abort_limit(struct tipc_link *l, u32 limit) | |
2888 | { | |
2889 | l->abort_limit = limit; | |
2890 | } | |
b4b9771b | 2891 | |
b4b9771b TL |
2892 | /** |
2893 | * tipc_link_dump - dump TIPC link data | |
2894 | * @l: tipc link to be dumped | |
2895 | * @dqueues: bitmask to decide if any link queue to be dumped? | |
2896 | * - TIPC_DUMP_NONE: don't dump link queues | |
2897 | * - TIPC_DUMP_TRANSMQ: dump link transmq queue | |
2898 | * - TIPC_DUMP_BACKLOGQ: dump link backlog queue | |
2899 | * - TIPC_DUMP_DEFERDQ: dump link deferd queue | |
2900 | * - TIPC_DUMP_INPUTQ: dump link input queue | |
2901 | * - TIPC_DUMP_WAKEUP: dump link wakeup queue | |
2902 | * - TIPC_DUMP_ALL: dump all the link queues above | |
2903 | * @buf: returned buffer of dump data in format | |
2904 | */ | |
2905 | int tipc_link_dump(struct tipc_link *l, u16 dqueues, char *buf) | |
2906 | { | |
2907 | int i = 0; | |
2908 | size_t sz = (dqueues) ? LINK_LMAX : LINK_LMIN; | |
2909 | struct sk_buff_head *list; | |
2910 | struct sk_buff *hskb, *tskb; | |
2911 | u32 len; | |
2912 | ||
2913 | if (!l) { | |
2914 | i += scnprintf(buf, sz, "link data: (null)\n"); | |
2915 | return i; | |
2916 | } | |
2917 | ||
2918 | i += scnprintf(buf, sz, "link data: %x", l->addr); | |
2919 | i += scnprintf(buf + i, sz - i, " %x", l->state); | |
2920 | i += scnprintf(buf + i, sz - i, " %u", l->in_session); | |
2921 | i += scnprintf(buf + i, sz - i, " %u", l->session); | |
2922 | i += scnprintf(buf + i, sz - i, " %u", l->peer_session); | |
2923 | i += scnprintf(buf + i, sz - i, " %u", l->snd_nxt); | |
2924 | i += scnprintf(buf + i, sz - i, " %u", l->rcv_nxt); | |
2925 | i += scnprintf(buf + i, sz - i, " %u", l->snd_nxt_state); | |
2926 | i += scnprintf(buf + i, sz - i, " %u", l->rcv_nxt_state); | |
2927 | i += scnprintf(buf + i, sz - i, " %x", l->peer_caps); | |
2928 | i += scnprintf(buf + i, sz - i, " %u", l->silent_intv_cnt); | |
2929 | i += scnprintf(buf + i, sz - i, " %u", l->rst_cnt); | |
71204231 | 2930 | i += scnprintf(buf + i, sz - i, " %u", 0); |
77cf8edb | 2931 | i += scnprintf(buf + i, sz - i, " %u", 0); |
b4b9771b TL |
2932 | i += scnprintf(buf + i, sz - i, " %u", l->acked); |
2933 | ||
2934 | list = &l->transmq; | |
2935 | len = skb_queue_len(list); | |
2936 | hskb = skb_peek(list); | |
2937 | tskb = skb_peek_tail(list); | |
2938 | i += scnprintf(buf + i, sz - i, " | %u %u %u", len, | |
2939 | (hskb) ? msg_seqno(buf_msg(hskb)) : 0, | |
2940 | (tskb) ? msg_seqno(buf_msg(tskb)) : 0); | |
2941 | ||
2942 | list = &l->deferdq; | |
2943 | len = skb_queue_len(list); | |
2944 | hskb = skb_peek(list); | |
2945 | tskb = skb_peek_tail(list); | |
2946 | i += scnprintf(buf + i, sz - i, " | %u %u %u", len, | |
2947 | (hskb) ? msg_seqno(buf_msg(hskb)) : 0, | |
2948 | (tskb) ? msg_seqno(buf_msg(tskb)) : 0); | |
2949 | ||
2950 | list = &l->backlogq; | |
2951 | len = skb_queue_len(list); | |
2952 | hskb = skb_peek(list); | |
2953 | tskb = skb_peek_tail(list); | |
2954 | i += scnprintf(buf + i, sz - i, " | %u %u %u", len, | |
2955 | (hskb) ? msg_seqno(buf_msg(hskb)) : 0, | |
2956 | (tskb) ? msg_seqno(buf_msg(tskb)) : 0); | |
2957 | ||
2958 | list = l->inputq; | |
2959 | len = skb_queue_len(list); | |
2960 | hskb = skb_peek(list); | |
2961 | tskb = skb_peek_tail(list); | |
2962 | i += scnprintf(buf + i, sz - i, " | %u %u %u\n", len, | |
2963 | (hskb) ? msg_seqno(buf_msg(hskb)) : 0, | |
2964 | (tskb) ? msg_seqno(buf_msg(tskb)) : 0); | |
2965 | ||
2966 | if (dqueues & TIPC_DUMP_TRANSMQ) { | |
2967 | i += scnprintf(buf + i, sz - i, "transmq: "); | |
2968 | i += tipc_list_dump(&l->transmq, false, buf + i); | |
2969 | } | |
2970 | if (dqueues & TIPC_DUMP_BACKLOGQ) { | |
2971 | i += scnprintf(buf + i, sz - i, | |
2972 | "backlogq: <%u %u %u %u %u>, ", | |
2973 | l->backlog[TIPC_LOW_IMPORTANCE].len, | |
2974 | l->backlog[TIPC_MEDIUM_IMPORTANCE].len, | |
2975 | l->backlog[TIPC_HIGH_IMPORTANCE].len, | |
2976 | l->backlog[TIPC_CRITICAL_IMPORTANCE].len, | |
2977 | l->backlog[TIPC_SYSTEM_IMPORTANCE].len); | |
2978 | i += tipc_list_dump(&l->backlogq, false, buf + i); | |
2979 | } | |
2980 | if (dqueues & TIPC_DUMP_DEFERDQ) { | |
2981 | i += scnprintf(buf + i, sz - i, "deferdq: "); | |
2982 | i += tipc_list_dump(&l->deferdq, false, buf + i); | |
2983 | } | |
2984 | if (dqueues & TIPC_DUMP_INPUTQ) { | |
2985 | i += scnprintf(buf + i, sz - i, "inputq: "); | |
2986 | i += tipc_list_dump(l->inputq, false, buf + i); | |
2987 | } | |
2988 | if (dqueues & TIPC_DUMP_WAKEUP) { | |
2989 | i += scnprintf(buf + i, sz - i, "wakeup: "); | |
2990 | i += tipc_list_dump(&l->wakeupq, false, buf + i); | |
2991 | } | |
2992 | ||
2993 | return i; | |
2994 | } |